1. A versatile perforation assembly for a web-fed rotary printing press comprising: a) a Cross Perforation Assembly (100) comprising i. a perforation cylinder (101) mounted on a shaft (106); ii. a pressure roller (102), mounted on a shaft (136) disposed away from and substantially parallel to the shaft (106); iii. a plurality of taper locks (103) for securing and adjusting the position of the perforation cylinder (101) on the shaft (106); iv. at least one drive source for the perforation cylinder (101) and/or pressure roller (102); and, b) a Control System (200) for controlling the speed and position of the cross perforation assembly (100) with respect to a web of paper traversing a webfed rotary printing press.

2. The versatile perforation assembly as claimed in claim 1, wherein the perforation cylinder (101) comprises: a) a perforation roller (125) mounted on the shaft (136), the perforation roller comprising a hollow cylinder tapered on the inside at both ends to accommodate the taper locks (103); b) at least one segment (115) attached at the outer curved surface of the perforation roller (125); c) at least a horizontal knife (110) and/or at least a segment knife (120) attached at a plurality of locations on the segment(s).

3. The versatile perforation assembly as claimed in any of the preceding claims, wherein the segments (115) are in the form of sections of a hollow cylinder, comprising: - a first curved surface (127a) and a second curved surface (127b), the surfaces being radially spaced apart about a common axis; - a pair of rectangular faces (128a and 128b) extending longitudinally at distal linear edges of the curved surfaces (127a and 127b); - a pair faces shaped as annular segments (129a and 129b) parallel to each other; - a plurality of segment attachment means (119) for securing the segments (115) on the perforation roller (125) using a plurality of fastening elements (139). - a plurality of holes (121) on faces (129a and/or 129b) for attachment of a plurality of segment knives; - a plurality of holes (124) on faces (128a and/or 128b) for attachment of a plurality of horizontal knives. 19

4. The versatile perforation assembly as claimed in any of the preceding claims, wherein the horizontal knife (110) has at least one substantially straight, toothed edge (134) for making perforations and a plurality of holes (133) for securing the knife onto faces (128a and/or 128b) of a segment.

5. The versatile perforation assembly as claimed in any of the preceding claims, wherein the segment knife (120) has at least one curved, toothed edge (132) for making perforations and a plurality of holes (131) for securing the knife onto faces (129a and/or 129b) of a segment.

6. The versatile perforation assembly as claimed in any of the preceding claims, wherein the drive source comprises at least one motor coupled to at least one shaft by a coupling means.

7. The versatile perforation assembly as claimed in claim 6, wherein the motor is a servo motor (104) coupled to at least one shaft (106 and/or 136) by a coupling (105).

8. The versatile perforation assembly as claimed in any of the preceding claims, wherein the control system comprises: i. a servo motor (104) coupled to a shaft (106) for driving the cross perforation assembly (100); ii. a servo drive (155) for supplying a controlled output to the servo motor (104); iii. an encoder (160) for keeping track of the number of rotations and position of the shaft (106) and sending a feedback signal to the servo drive (155); iv. a motion controller (150) for giving a position and speed command to the servo drive (155); v. a central encoder (140) for providing a speed reference signal to the motion controller (150); vi. a human machine interface or HMI (145) for providing a command to the motion controller (150) to start, stop or operate the servo drive (155).

9. The versatile perforation assembly as claimed in any of the preceding claims, comprising four segments (115, 116, 117 and 118) attached at the outer curved surface of the perforation roller (125).

10. The versatile perforation assembly as claimed in any of the preceding claims, optionally comprising an alternative horizontal knife (130) having at least one substantially straight, toothed edge (134) for making perforations and a plurality of U-shaped cuts (137) for securing the knife onto faces (128a and/or 128b) of a segment. 20

11. The versatile perforation assembly as claimed in any of the preceding claims, optionally comprising an annular shaped, alternative segment knife (135) having at least one curved, toothed edge (132) for making perforations and a plurality of holes (131) for securing the knife onto faces (129a and/or 129b) of a segment.

12. The versatile perforation assembly as claimed in any of the preceding claims, optionally comprising an irregular shaped knife having toothed edges corresponding to the boundary of the shape to be perforated mounted on one or more curved surface (127a) of at least one segment (115).

13. The versatile perforation assembly as claimed in any of the preceding claims, optionally comprising a regular or irregular shaped die mounted on the curved surface (127a) of at least one segment (115) for cutting of regular or irregular shape(s) from the web.

14. The versatile perforation assembly asclaimed in any of the preceding claims, further comprising a pressure setting screw (107) for adjusting the distance between the outer peripheries of the pressure roller (102) and the perforation cylinder (101).

15. The versatile perforation assembly as claimed in any of the preceding claims, further comprising a holding bracket (138) for holding the pressure roller (102) and absorbing backward stroke.

16. The versatile perforation assembly as claimed in any of the preceding claims, further comprising a support structure for fitting the cross perforation assembly (100) in a web-fed rotary printing press, the support structure comprising: - a plurality of mounting plates (109) fixed onto one or more side frames (108) of the existing web-fed rotary printing press; - a supporting beam (111) extending between the mounting plates for supporting the pressure roller (102); - a tie beam (113) extending between the mounting plates for supporting the cross perforation assembly; - a supporting bracket with bearing (114) substantially perpendicular to the tie beam (113) and the shaft (106) of the perforation cylinder; and, - a plurality of bearing locks (112) for engagement with the shafts (106 and/or 136).

17. A web-fed rotary printing press comprising at least one printing section, at least one folding section and a versatile perforation assembly as claimed in any of the preceding claims; said versatile perforation assembly being 2 1 provided prior to the folding section with reference to the general direction of a web of paper traversing through the printing press. 18.The web-fed rotary printing press as claimed in claim 17, wherein the versatile perforation is provided after the printing section and prior to the folding section with reference to the general direction of a web of paper traversing through the printing press.

19. A method of perforating a continuous web of paper for creating detachable advertisements, coupons, vouchers, return mailers, notices, forms, etc., comprising the steps of: a) Providing a web-fed rotary printing press comprising a versatile perforation assembly composed of a cross perforation assembly (100) and a control system (200); the cross perforation assembly (100) comprising: i. a perforation cylinder (101) mounted on a shaft (106); ii. a pressure roller (102), mounted on a shaft (136) disposed away from and substantially parallel to the shaft (106); iii. a plurality of taper locks (103) for securing and adjusting the position of the perforation cylinder (101) on the shaft (106); iv. at least one drive source (104) for the perforation cylinder (101) and/or pressure roller (102); and, the control system (200) comprising: i. a servo motor (104) coupled to a shaft (106) for driving the cross perforation assembly (100); ii. a servo drive (155) for supplying a controlled output to the servo motor (104); iii. an encoder (160) for keeping track of the number of rotations and position of the shaft (106) and sending a feedback signal to the servo drive (155); iv. a motion controller (150) for giving a position and speed command to the servo drive (155); v. a central encoder (140) for providing a speed reference signal to the motion controller (150); vi. a human machine interface or HMI (145) for providing a command to the motion controller (150) to start, stop or operate the servo drive(155); b) adjusting the position of the perforation cylinder (101) on the shaft (106) and attaching a plurality of horizontal knives (110) and/or segment knives (120) at a desired location on one or more segments (115) of the perforation cylinder (101); 2 2 c) providing a web of paper traversing through the press for printing and passing between the perforation cylinder (101) and the pressure roller (102) of the cross perforation assembly (100); d) preventing relative slipping between the web passing through the perforation assembly by keeping the peripheral velocity of the perforation cylinder (101) roughly equal to the speed of traversal of the web by using the control system (200); e) creating perforations to define a tearable boundary by contacting a plurality of teeth of the knives (110, 120) of the perforation cylinder (101) with the web moving between the perforation cylinder (101) and the pressure roller (102).

20. The method of perforating a continuous web of paper as claimed in claim 19, wherein the circumference of the outer periphery of the perforation cylinder is roughly a multiple or sub-multiple of the height of sheets cut from the web at a folder section in the press, the height being roughly the same as the distance between two successive cuts made on the web during folding operation; and the peripheral velocity of the perforation cylinder (101) is adjusted to a corresponding sub-multiple or multiple of the speed of traversal of the web by the control system (200).

21. The method of perforating a continuous web of paper as claimed in claims 19 or 20, wherein a pair of segment knives and a pair of horizontal knives are attached at similar opposite faces of at least one of the segments (115) of the perforation cylinder (101) for creating rectilinear shaped perforations on the web passing through the cross perforation assembly (100). 22.The method of perforating a continuous web of paper as claimed in any of the claims 19 to 21, wherein the web-fed rotary printing press provided in step (a) is a web-offset printing press. 23.The method of perforating a continuous web of paper as claimed in any of the claims 19 to 22, further comprising the step of cutting the web into sheets of suitable size after making perforations on the web; the suitable size being the size of a sheet for a newspaper or other printed medium. Dated this lltdahy of J uly 2013

FIELD OF THE INVENTION
The present invention relates to a web-fed rotary printing press, more particularly to
a web-fed rotary printing press having a versatile perforation assembly, and methods
of operating the same.
BACKGROUND OF THE INVENTION
High speed web-fed rotary printing presses are extensively used for printing
newspapers. Newspapers contain several advertisements, coupons, vouchers, return
mailers, notices, forms, etc. It is often preferable to have perforations in the
newspapers around the margins of these coupons, vouchers, etc. so that they can be
easily detached and utilized without using any cutting equipment like scissors,
blades, etc. The user can redeem these coupons or send feedback to the advertiser,
making this a cheap and efficient way of mass-advertising.
However, providing suitable perforations, usually in the form of lines are difficult in
high-speed rotary printing presses. A common alternative is to add separate
pamphlets or inserts in the folds of the newspapers. Since these have to be printed
separately, usually on more expensive and thicker paper, and are manually inserted
at the time of distributing the newspapers, this is a time consuming and expensive
option. An apparatus for cross perforating continuous web forms is disclosed by US
Patent No. 7,484,445. However, this is restricted to slow speed equipment and not
suited for high speed printing presses. Moreover, only horizontal perforations are
provided to facilitate folding of forms.
Some other methods are also disclosed in the prior arts to solve this problem.
However, these are restricted in terms of providing only horizontal or only vertical
0 perforations. Other methods are very restricted such that a new perforating
apparatus is needed for different shapes, sizes or locations of the perforations.
GB 2177645 discloses a cross perforator for a web fed printing press including two
laterally spaced side frames each supporting a disc between which are located a
plurality of cylinders each of different diameter carrying perforators, means being
provided to index the discs to a position to bring a perforating cylinder of desired
diameter into contact with an anvil and at the same time engage driven means of a
perforating cylinder to drive mechanism on the printing press, further means being
provided to lock the discs in the selected position relatively to the sideframes.
However, this method is complex and capable of handling only a few types of
perforations. Also, this method is only usable in rotary printing presses with an
integrated drive source, which have lost popularity in favor of the "shaftless"
printing presses which are more commonly used in the modern rotary printing
presses. In the shaftless printing presses like the one disclosed in US Patent No.
2
6,408,748, several motors are provided to individually drive the various components
of the press. Electrical synchronous control is maintained so that the rotational
speed and phase of the motors and driven components can be matched with each
other. Thus, the press becomes less complicated and problems in a particular section
can be isolated easily.
Thus, there is a need to provide a method and apparatus for providing horizontal
l and vertical perforations in a high-speed web-fed rotary printing press which is
versatile, economical, time saving and does not obstruct the normal printing
operation. A versatile apparatus should be able to provide perforations of various
shapes and sizes without making any major changes to the rotary printing press. It
should be able to produce multiple perforations in a single pass of the web through
the assembly. The versatile perforation assembly should be capable of creating
perforations at high web speeds up to about 12.89 m/s without breakage or
deformation of the web. The versatile perforation assembly should also be capable
I of making adjustments and rectifying errors without halting the operation of the
press.
SUMMARY OF THE INVENTION
The present invention provides a versatile perforation assembly for a web-fed rotary
press that can create different shapes of perforations on a running web with a single
assembly, before the web is cut into sheets. The versatile perforation assembly may
be retro-fitted in an existing press or may be incorporated in a web-fed rotary
printing press capable of making horizontal and vertical and other linear or nonlinear
perforations.
In accordance with an embodiment of the invention is provided a versatile
perforation assembly for a web-fed rotary printing press comprising:
a) a Cross Perforation Assembly comprising
i. a perforation cylinder mounted on a shaft;
ii. a pressure roller, mounted on a shaft disposed away from and
substantially parallel to the shaft;
iii. a plurality of taper locks for securing and adjusting the position of the
perforation cylinder on the shaft;
iv. at least one drive source for the perforation cylinder and/or pressure
roller; and,
b) a Control System for controlling the speed and position of the cross
perforation assembly with respect to a web of paper traversing a web-fed
rotary printing press.
In accordance with another embodiment of the invention the perforation cylinder of
the versatile perforation assembly comprises:
a) a perforation roller mounted on the shaft, the perforation roller
comprising a hollow cylinder tapered on the inside at both ends to
accommodate the taper locks;
b) at least one segment attached at the outer curved surface of the
perforation roller;
c) at least a horizontal knife and/or at least a segment knife attached at a
plurality of locations on the segment(s).
In accordance with yet another embodiment of the invention the segments of the
perforation cylinder are in the form of sections of a hollow cylinder, comprising:
- a first curved surface and a second curved surface, the surfaces being
radially spaced apart about a common axis;
- a pair of rectangular faces extending longitudinally at distal linear edges
of the curved surfaces;
- a pair faces shaped as annular segments parallel to each other;
- a plurality of segment attachment means for securing the segments on
the perforation roller using a plurality of fastening elements.
- a plurality of holes on faces for attachment of a plurality of segment
knives;
- a plurality of holes on faces for attachment of a plurality of horizontal
knives.
In accordance with yet another embodiment of the invention the horizontal knife of
the cross perforation assembly has at least one substantially straight, toothed edge
for making perforations and a plurality of holes for securing the knife onto faces of a
segment.
In accordance with yet another embodiment of the invention the segment knife of
the cross perforation assembly has at least one curved toothed edge for making
perforations and a plurality of holes for securing the knife onto faces of a segment.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly wherein the drive source comprises at least one motor coupled
to at least one shaft by a coupling means.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly, wherein the motor is a servo motor coupled to at least one
shaft by a coupling.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly, wherein the control system comprises:
i. a servo motor coupled to a shaft for driving the cross perforation
assembly;
ii. a servo drive for supplying a controlled output to the servo motor;
iii. an encoder for keeping track of the number of rotations and position
of the shaft and sending a feedback signal to the servo drive;
iv. a motion controller for giving a position and speed command to the
servo drive;
v. a central encoder for providing a speed reference signal to the motion
controller;
vi. a human machine interface or HMI for providing a command to the
motion controller to start, stop or operate the servo drive.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly comprising four segments attached at the outer curved surface
of the perforation roller.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly, further comprising an irregular shaped knife having toothed
edges corresponding to the boundary of the shape to be perforated mounted on one
or more curved surface of at least one segment.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly, further comprising a regular or irregular shaped die mounted
on the curved surface of at least one segment for cutting of regular or irregular
shape(s) from the web.
@ In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly further comprising a pressure setting screw for adjusting the
distance between the outer peripheries of the pressure roller and the perforation
cylinder.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly further comprising a holding bracket for holding the pressure
roller and absorbing backward stroke.
In accordance with yet another embodiment of the invention is provided a versatile
perforation assembly further comprising a support structure for fitting the cross
perforation assembly in a web-fed rotary printing press, the support structure
comprising:
a plurality of mounting plates fixed onto one or more side frames of the
existing web-fed rotary printing press;
a supporting beam extending between the mounting plates for
supporting the pressure roller;
a tie beam extending between the mounting plates for supporting the
cross perforation assembly;
a supporting bracket with bearing substantially perpendicular to the tie
beam and the shaft of the perforation cylinder; and,
a plurality of bearing locks for engagement with the shafts.
In accordance with an embodiment of the invention is provided a web-fed rotary
printing press comprising at least one printing section, at least one folding section
and a versatile perforation assembly as claimed in any of the preceding claims; said
versatile perforation assembly being provided prior to the folding section with
reference to the general direction of a web of paper traversing through the printing
press.
In accordance with another embodiment of the invention is provided a web-fed
rotary printing press, wherein the versatile perforation is provided after the printing
section and prior to the folding section with reference to the general direction of a
web of paper traversing through the printing press.
In accordance with an embodiment of the invention is provided a method of
perforating a continuous web of paper for creating detachable advertisements,
coupons, vouchers, return mailers, notices, forms, etc., comprising the steps of:
a) Providing a web-fed rotary printing press comprising a versatile
perforation assembly composed of a cross perforation assembly and a
control system; the cross perforation assembly comprising:
i. a perforation cylinder mounted on a shaft;
ii. a pressure roller, mounted on a shaft disposed away from and
substantially parallel to the shaft;
iii. a plurality of taper locks for securing and adjusting the position of
the perforation cylinder on the shaft;
iv. at least one drive source for the perforation cylinder and/or
pressure roller; and,
the control system comprising:
i. a servo motor coupled to a shaft for driving the cross perforation
assembly;
ii. a servo drive for supplying a controlled output to the servo motor;
iii. an encoder for keeping track of the number of rotations and
position of the shaft and sending a feedback signal to the servo
drive;
iv. a motion controller for giving a position and speed command to
the servo drive;
v. a central encoder for providing a speed reference signal to the
motion controller;
vi. a human machine interface or HMI for providing a command to
the motion controller to start, stop or operate the servo drive;
b) adjusting the position of the perforation cylinder on the shaft and
attaching a plurality of horizontal knives and/or segment knives at a
desired location on one or more segments of the perforation cylinder;
c) providing a web of paper traversing through the press for printing and
passing between the perforation cylinder and the pressure roller of the
cross perforation assembly;
d) preventing relative slipping between the web passing through the
perforation assembly by keeping the peripheral velocity of the
perforation cylinder roughly equal to the speed of traversal of the web by
using the control system;
e) creating perforations to define a tearable boundary by contacting a
plurality of teeth of the knives of the perforation cylinder with the web
moving between the perforation cylinder and the pressure roller.
In accordance with another embodiment of the invention is provided a method of
perforating a continuous web of paper, wherein the circumference of the outer
periphery of the perforation cylinder is roughly a multiple or sub-multiple of the
height of sheets cut from the web at a folder section in the press, the height being
roughly the same as the distance between two successive cuts made on the web
during folding operation; and the peripheral velocity of the perforation cylinder is
adjusted to a corresponding sub-multiple or multiple of the speed of traversal of the
web by the control system.
In accordance with another embodiment of the invention is provided a method of
perforating a continuous web of paper, wherein a pair of segment knives and a pair
of horizontal knives are attached at similar opposite faces of at least one of the
segments of the perforation cylinder for creating rectilinear shaped perforations on
the web passing through the cross perforation assembly.
In accordance with yet another embodiment of the invention is provided a method
of perforating a continuous web of paper, wherein the web-fed rotary printing press
provided in step (a) is a web-offset printing press.
In accordance with yet another embodiment of the invention, the method of
perforating a continuous web of paper further comprises the step of cutting the web
into sheets of suitable size after making perforations on the web; the suitable size
being the size of a sheet for a newspaper or other printed medium.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and further objects, features and advantages of the current invention will
be explained more fully from the detailed description taken with the accompanying
drawings in which:
Fig. 1 is a schematic diagram of the cross perforation assembly coupled with a servo
motor.
I
I 0 Fig. 2 is a perspective view of the perforation cylinder in accordance with an
embodiment of the invention.
I Fig. 3A and 3B are two views of the perforation cylinder of Fig. 2.
I
I
Fig. 4 is a perspective view of a segment of the perforation cylinder of Fig. 2.
Fig. 5 is a partial exploded perspective view of the perforation cylinder of Fig. 2.
Fig. 6 is a diagram showing an alternative form of the horizontal knife.
Fig. 7 is a diagram showing an alternative form of the segment knife.
Fig. 8A-D are schematic diagrams showing a few of the perforations possible using
the cross perforation assembly of the present invention.
Fig. 9 is a schematic diagram showing the interrelationship between the various
components of the control system for controlling the cross perforation assembly in
@ accordance with an embodiment of the invention.
The given figures are with reference to a particular embodiment of the versatile
perforation assembly for a shaftless rotary printing press. The rotary printing press is
a complex machine and has been explained in a simplified manner and only the
components of particular relevance to the invention are explained in detail. It is
envisaged to keep the terms used to represent the various components as general as
possible, so that even if they are not clear by their name, they can be comprehended
by their function. The teachings and methods of the invention are not limited to the
present example and can be readily €0 other types of printing presses as well.
DESCRIPTION
Discussed below are some representative embodiments of the current invention. It
is understood, however, that other versatile perforation apparatuses having other
shapes and dimensions are contemplated within the scope of the invention. The
versatile perforation assembly comprises a unique cross perforation assembly and a
control system having various components to control the operation of the same. The
cross perforation assembly may be retrofitted at any location in the path of the web
before the folder section where it is cut into sheets. The control system may be
provided at any convenient location close to the cross perforation assembly. The
invention in its broader aspects is not limited to the specific details, representative
devices and methods, and illustrative examples shown and described in this section
in connection with the embodiments and methods. The invention according to its
various aspects is particularly pointed out and distinctly claimed in the attached
claims read in view of this specification, and appropriate equivalents. It is to be
noted that, as used in the specification and the appended claims, the singular forms
I 1 I 1 I1 a, an," and "the" include plural referents unless the context clearly dictates
otherwise.
The following description is with reference to a high speed web-fed rotary press with
I
several individual drive sources for various components. Such a printing press is
usually used in the newspaper sector by virtue of the high print speeds. In the
present embodiment, a cross perforation assembly was fitted in an existing highspeed
rotary printing press at a location in the web path before the folder section,
I
i.e. before the web is cut into sheets. The terms "before" and "after" used for
explaining the location of various components of the printing press are with
reference to the direction of traversal of the web starting from the reel stands. This
perforation assembly is driven by a separate motor that works in synchronization @ with the existing press. The term "perforated items" stated hereafter refers to any
advertisements, coupons, vouchers, return mailers, notices, forms, etc. which are
desired to be provided with perforations along their boundaries in a newspaper.
Fig. 1 is a schematic diagram of the cross perforation assembly coupled with a servo
motor. The cross perforation assembly (100) comprises a perforation cylinder (101)
disposed away from a pressure roller (102). The perforation cylinder (101) is
mounted onto a shaft (106) which is substantially parallel to and laterally separated
from another shaft (136) of the pressure roller (102). The web of paper being printed
and/or perforated passes between the cylinders (101, 102). A horizontal knife (110)
is attached to the perforation cylinder (101) for making the desired perforations on
the web. A pair of taper locks (103) is provided for securing the perforation cylinder
(101) at any required position on the shaft (106). They also help in adjusting the
position of the perforation cylinder with respect to the web. A pair of pressure
9
setting screws (107) is provided to adjust the distance of the pressure roller (102)
from the perforation cylinder (101). Thus, the pressure exerted by the perforation
cylinder (101) on the incoming web can be adjusted using this screw in order to
ensure clean perforations without tearing of the web. Also, when a large number of
perforated copies are being produced, the outer surface of the pressure roller
(usually made of rubber) gets eroded due to friction and the spacing between the
cylinders (101, 102) increases. The spacing can be readjusted with the help of these
screws.
The shaft (106) of the perforation cylinder is driven with the help of a servo motor
(104) which is capable of precise control over speed and angular position of the
cylinder. A coupling (105) connects the servo motor (104) with the shaft (106) to
transfer the drive. In the present embodiment, a separate drive source is not
I provided for the pressure roller, so its shaft (136) does not rotate. Thus, when the
web passes between the pressure roller and the perforation cylinder, the pressure
roller also rotates due to the force exerted by the perforation cylinder and the
moving web. Thereafter, the speed of the pressure roller remains almost the same
I as the perforation cylinder. A pair of bearing blocks (112) is provided to facilitate the
transfer of motion.
I
The whole assembly can be conveniently fitted in the existing machinery of a printing
press. Side frames (108) represent the existing machine body on which a pair of
mounting plates (109) for the cross perforation assembly (100) is fixed. The
mounting plate (109) is used to mount the perforation cylinder and pressure roller. A
tie beam (113) is provided to give support to the assembly. A pair of supporting
bracket with bearing (114) is provided substantially perpendicular to both the tie
beam (113) and the shaft (106) to reduce wobbling effect of perforation cylinder at
high speed. A pair of bearing blocks (112) is provided for transferring the motion.
A supporting beam (111) is provided to support the pressure roller. A pair of holding
brackets for pressure roller (138) is provided substantially perpendicular to both the
shaft (136) and the supporting beam (111) for holding the pressure roller and
absorbing the backward stroke if present. The holding brackets (138) have margin for
adjustment of the position of the shaft (136) by the pressure setting screws (107). A
plurality of screws, nuts, bolts, clamps and the like may be used to assemble the
various components shown in the given figure.
Fig. 2 is a perspective view of the perforation cylinder (101) of Fig. 1. The perforation
cylinder comprises a perforation roller (125) which is a hollow cylinder tapered on
the inside at both ends to accommodate the taper locks (103). The taper locks secure
the perforation cylinder on the shaft (106) with the help of a plurality of bolts and
10
bushes (123). Any suitable type of taper locks and bushes can be chosen. Four
segments (115-118) are attached to the outer curved surface of the perforation
roller with the help of a plurality of segment attachment means (119). The segments,
i.e. first segment (115), second segment (116), third segment (117) and fourth
segment (118) are essentially segments or sections of hollow cylinders. The arc
lengths of the segments are different to equip different sizes of segment knives
(120). This allows versatility in terms of the size of the perforations that can be done.
The number of segments can also be changed as per the requirements. One would
preferably choose a combination of segments that correspond to the most
commonly used dimensions of the perforated items. More segment knives may be
attached by securing them using the holes (121) provided on the segments.
In the given figure a segment knife (120) is attached at one surface of the first
segment (115) with the help of bolts (122). One or more bolts are provided
depending upon the length of the segment. The horizontal knife (110) is attached at
another surface of the first segment (115) with the help of a plurality of bolts (126).
These knives are clamped onto one or more surfaces of one or more segments such
that the edges having teeth are disposed outside the periphery of the respective
segments. Thus, by attaching a plurality of knives a number of perforated items can
be created in a single pass through the cross perforation assembly.
Fig. 3A and 3B are two views of the perforation cylinder of Fig. 2 showing its inside
profile. The perforation roller (125) is visible as a hollow cylinder tapered on the
inside at its two terminal ends. The holes for attaching segment knife (121) are
located at terminal ends of the segments (115-118) attached to the perforation
roller (125). They are threaded on the inside to enable fastening of the bolts (122).
The holes for horizontal knife (124) are evenly spaced across the length of the
segments. They are also partially or fully threaded on the inside to enable fastening
of the bolts (126).
The segment attachment means (119) have similar appearance in Fig. 3A and 38 due
to their cylindrical symmetry. The segment attachment means comprises two
cylindrical cavities joint end to end and fastening elements (139) in the forms of
screws, bolts, bushes, etc. The first cavity (119a) is located within the segments and
the second cavity (119b) extends between the segments (115-118) and the
perforation roller (125). One or both of these cavities may be partially or fully
threaded on the inside to allow a suitable fastening element (not shown) to be
inserted and fix the segments onto the perforation roller. The first cavity is located
closer to the periphery of the segments and has larger diameter so as to facilitate
easy insertion and fastening of the fastening elements (139).
Fig. 4 is a perspective view of the segment (115) of the perforation cylinder of Fig. 2.
The segment has a first curved surface (127a) and a second curved surface (127b).
The first cavity (119a) passes through the first curved surface (127a) and the second
cavity (119b) passes through the second curved surface (127b). A pair of rectangular
faces (128a, 128b) is present at distal ends of the curved surfaces (127a, 127b) and
extends longitudinally. The horizontal knife (110) is attached at the rectangular face
(128a) with the help of b o k (126). Teeth of the toothed edge (134) can be seen
extending above the periphery of the segment defined by the first curved surface
(127a). A pair of annular segments 129a and 129b are provided such that they are
parallel to each other and perpendicular to the pairs of faces 127a, 128a and 127b,
128b respectively. The segment knife (120) is attached at the first annular segment
(129a) with the help of bolts (122). Teeth of the toothed edge (132) can be seen
extending above the periphery of the segment defined by the first curved surface
Fig. 5 is a partial exploded perspective view of the perforation cylinder of Fig. 2. The
perforation roller (125) is seen with the taper lock (103) attached at one of its
terminal ends with the help of the bolts and bushes (123). All the segments (115-
118) are visible along with the various holes (121, 124) for attachment of knives, and
the segment attachment means (119). It is understood that several cylindrical
threaded holes are provided on the outer periphery of the perforation roller (125)
for accommodating the fastening elements (139).
I I The horizontal knife (110) is provided with several holes (133) complimenting the
holes (124) present on one or both rectangular faces of the segments. The bolts
(126) pass through each complimentary pair of holes on the segment and horizontal
knife to secure the knife in position and ensure that it doesn't wobble during
@ operation of the press. The holes may be provided with some scope for adjustment
to allow change in the position of the toothed edge (134) of the knife. Fig. 6 is a
diagram showing an alternative horizontal knife (130) wherein U-shaped cuts (137)
are provided instead of the holes (133). These U-shaped cuts provide sufficient
I I allowance for adjustment of the position of the knife because the bolts (126) can be
tightened at different locations on the U-shaped cuts (137). The side profile of the
I toothed edge (134) can be seen in this figure. The edge has several evenly spaced
teeth which come in contact with the web to generate perforations. Several other
types of knives and teeth profiles are known to a person skilled in the art and any
suitable form may be selected as per the requirements.
Returning to Fig. 5, the segment knife (120) is provided with a plurality of holes (131)
complimenting the holes (121) present on one or both annular segment (129a, 129b)
faces of the segments. In .the present example, three holes each are provided on first
12
segment (115) and segment knife (120). The holes may be provided with some scope
for adjustment to allow change in the position of the toothed edge (132) of the
knife. The segment knife is superposable on the face (129a) in the given figure, but it
may be smaller or larger provided it is tightly secured onto the segment and doesn't
wobble, crack or bend upon operation of the press. In some cases where it is
required to perforate the web completely along an edge extending in the direction
of motion of the web, an alternative form of segment knife may be required as
shown in Fig. 7. The alternative segment knife (135) is shaped in the form of an
annulus defined by two concentric circular edges. The outer toothed edge (132) has
several evenly spaced teeth which come in contact with the web to generate
perforations. Several holes (131) are provided for attachment of this knife. The holes
are generally circular or oval (for adjustment).
The mechanical features of the cross perforation assembly are explained in some
detail figures 1 to 7. However, it must be appreciated that the assembly is versatile
in operation and many variations may be possible by making small adjustments
and/or modifications without diverging from the scope of the invention. For
instance, the number and position of the segments can be changed with respect to
the perforation roller. The longitudinal or circular segment length of the segments
may also be changed. The knives (110, 120) may only extend partially along the
length of a face of the segment instead of being superposable with the complete
face as in the above figures. The assembly may also be adjusted so that only a
portion of the knives comes in contact with the web.
Fig. 8A-D are schematic diagrams showing a few of the perforations possible using
the cross perforation assembly of the present invention. As shown in Fig. 8A, the
newspaper has a height "h" which is roughly the same as the distance between two
successive cuts made on the web during folding operation. The sheets are folded to
create a fold or crease (141) of length "h" as shown in the figure. In Fig. 8A, a
perforated rectangle is produced such that all of its edges are within the margins of
the newspaper sheet. In this case the longitudinal length of the segment should be
less than the width of the newspaper sheet "w" (after folding). Then a pair each of
horizontal and segment knives is fixed onto the segment to get the desired
perforations. In Fig. 8B, an existing edge of the web is used as part of the perforated
rectangle, so only a part of the perforation cylinder is brought in contact with the
web and a single segment knife and a pair of horizontal perforation knives is
required. In Fig. 8C, two edges of the newspaper (one existing edge of the web and
one created in folder section of press) are used, so just one horizontal knife and one
segment knife is required. Thus, the cross perforation assembly as configured in Fig.
2 would give the desired results. In Fig. 8D, just a single perforation line should be
created using a single horizontal knife because two existing edges are used as in Fig.
13
8C and the third edge is proximate to the fold or crease (141) of the newspaper. If
required, a segment knife may be added to provide perforation on the edge
proximate to the crease (141) lines as well. The longitudinal length of the perforation
cylinder would be greater than the width of the newspaper sheet (w) and less than
the web width (approximately (2w)) to create perforations on both the sheets
present on either side of the crease (141) in a single pass through the cross
perforation assembly.
The given examples were for rectilinear shapes, but other shapes are also possible by
making suitable adjustments. For example a knife having teeth along a section of a
spiral may be used to create inclined perforated lines (inclined with respect to the
edge of the web). Other curved perforation knives may be used to create perforated
circles, ovals, etc. a In an optional aspect of the invention, perforation can be made in other irregular
shapes comprising a combination of straight and curved lines like cars, mobile
phones, computers, home appliances, etc. In this case, the horizontal and segment
knives may not be required. Instead, an irregular shaped knife having toothed edges
corresponding to the boundary of the shape to be perforated is mounted on one or
more curved surface of the segment. It is to be noted that the shape of the knife is
decided according to the projection of the required shape on a curved surface
(perforation cylinder). Thus, when the knife presses on the web passing through the
cross-perforation assembly, the required shape is perforated. The irregular shaped
knife may be first attached onto a plate and then the plate is fixed onto the
perforation cylinder.
Further instead of perforating the above mentioned irregular shapes, they may also @ be cut from the web. Thus, instead of the irregular shaped knife, a die of suitable
shape is mounted on the curved surface of one or more segments. Upon impression
on the web, the irregular shapes may be cut out from the web and the cut out pieces
removed and/or collected by suitable means. It is evident that dies can be used to
cut out regular shapes like circles, ovals, polygons, etc. as well.
Fig. 9 is a schematic diagram showing the interrelationship between the various
components of the control system (200) for controlling the cross perforation
assembly in accordance with an embodiment of the invention. The central encoder
(140) is usually a part of the existing press and gives speed set point to other
associated machines like reel stand, mail room and register control system. Thus,
this speed reference is also used for the cross perforation assembly. In the given
figure, the central encoder (140) provides the speed reference signal to the motion
controller (150). The motion controller (150) is the key central component which also
14
takes commands from a Human Machine Interface or HMI (145). In a particular
embodiment, the HMI is in the form of a touch operated display through which the
operator may start, stop or operate the servo drive (155) to reduce the offset in the
perforations. At machine startup, the operator gives command to position the
perforation cylinder at a desired location. Thereafter, if it is observed that the web is
not being perforated at the correct location, the operator inputs a command to
change the position of the perforation cylinder relative to the web accordingly. The
motion controller (150) generates position and speed command for the servo drive
(155) on the basis of the inputs received from the HMI (145) and central encoder
(140). The servo drive (155) is a position controlled drive which is capable of
maintaining position while following speed. Thus, it gives controlled output to the
servo motor (104) with encoder (160) which is used to drive the cross perforation
assembly. The servo motor is a rotary actuator that allows for precise control over
angular position. It consists of a motor coupled to a sensor for position feedback
called encoder. In a particular embodiment, the encoder (160) is an optical encoder
that keeps track of the number of rotations and position of the shaft and sends
feedback signal to the servo drive.
The speed reference signal is proportionate to the instantaneous speed of the
printing press. It provides the reference followed by the cross perforation assembly
to maintain same speed as the printing units to avoid improper perforation or web
breakage. Thus, the control system (200) for the cross perforation assembly keeps
the speed of the perforation cylinder approximately same as the web entering it
from the printing unit or any other section of the press preceding the folder section.
Thus, there is no relative slipping between the web and the perforation cylinder.
In case there is an error in the location of the perforations, the same has to be
@ corrected by slightly increasing or decreasing the perforation cylinder speed in
comparison with the incoming web. This function is performed by the motion
controller after receiving the command from the HMI and accordingly sends a
command to the servo drive such that the offset is gradually minimized without
I tearing or deforming the web. Only a few copies are expected to have improper 1 i perforations in the process and can be rejected at a later stage. Similarly, when one 1 edition has been printed and another edition has to be printed with different sets of
perforations, the controller will first adjust the cross perforation assembly (100)
accordingly and then check for the offset upon startup. Based on the error in
location of the perforations, a command is given to the motion controller via HMI.
The precise control over speed is also essential at the time of starting or stopping the
press to prevent breakage of the web due to the cross perforation assembly. Thus,
synchronization of the cross perforation assembly with the existing press is ensured
at every stage of operation, which enables the press to produce accurate
perforations on a continuous web moving at high speeds.
In one preferred embodiment, the circumference of perforation cylinder equals the
height of the newspaper sheet, "h" which is roughly the same as the distance
between two successive cuts made on the web during folding operation. However,
the circumference may be reduced or increased to multiples or submultiples of "h"
provided the angular velocity of the perforation cylinder is changed accordingly to
avoid web breakage. For example if the circumference of the perforation cylinder is
reduced to (h/2), the angular velocity of the cylinder has to be roughly doubled.
Similarly, if the circumference is increased to (2h), the angular velocity of the
cylinder has to be roughly halved.
@
Several variations are possible within the scope of the invention. As explained
earlier, the cross perforation assembly needs to be provided before the folder
section. It is preferable to install the assembly after the printing section, but it may
be installed preceding to it or within it (as contemplated in Fig. 2 of US Patent
I 3,995,555. The taper locks for adjusting and securing the perforation cylinder may be
replaced by an automated adjustment means. The pressure roller shaft (136) may
also be provided with a separate drive source. One could also use a belt to transfer
the torque produced by the servo motor (104) to the pressure roller. The assembly
may be replicated at multiple locations in the printing press depending upon the
number of pages of the newspaper to be perforated. The gap provided between the
segments may also be reduced or increased as required.
The controlling apparatus described in Fig. 9 was for the modern rotary press with
several individual drive sources. In case the cross perforation assembly is to be used
in a rotary printing press with a single drive source then the angular velocity of the
various cylinders is maintained by using the appropriate gears and couplings. Thus,
the operator would configure the perforation cylinder in the correct position before
startup itself to get perforations at the desired locations since reducing offset during
operation would be a cumbersome exercise.
The invention is not limited to the embodiments which have been described and
illustrated by way of example and numerous modifications and variations can be
proposed without departing from the scope of the appended claims. The teachings
of the invention may be applied to other types of printing presses and perforation
equipment with or without some minor modifications.
REFERNCE NUMERALS
100. Cross Perforation Assembly
101. Perforation Cylinder
102. Pressure Roller
I I 103. Taper Lock
104. Servo Motor
105. Coupling
106 and 136. Shafts
107. Pressure Setting Screw
108. Side Frame
109. Mounting Plate
110. Horizontal Knife
1 @ 111. Supporting Beam
112. Bearing Lock
113. Tie Beam
114. Supporting Bracket with Bearing
115. First Segment
116. Second Segment
117. Third Segment
I 118. Fourth Segment
119. Segment Attachment Means
119a and 119b. First and Second Cavity
120. Segment Knife
121. Holes for attaching segment knife
122. Bolts for attaching segment knife
123. Taper Lock Bolts and bushes
124. Holes for horizontal knife
125. Perforation roller
126. Bolts for attaching horizontal knife
127a. First curved surface
127b. Second curved surface
128a. First rectangular surface
128b. Second rectangular surface
129a. First annular segment
129b. Second annular segment
130. Alternative Horizontal knife
131. Segment knife attachment holes
132. Toothed edge of segment knife
133. Horizontal knife attachment holes
134. Toothed edge of horizontal knife
17
135. Alternative segment knife
137. U-shaped cuts
138. Holding bracket for pressure roller
139. Fastening elements
140. Central Encoder
141. Fold or crease of newspaper
145. Human Machine Interface (HMI)
150. Motion Controller
155. Servo Drive
160. Motor Encoder
200. Control System

We Claim:
1. A versatile perforation assembly for a web-fed rotary printing press
comprising:
a) a Cross Perforation Assembly (100) comprising
i. a perforation cylinder (101) mounted on a shaft (106);
ii. a pressure roller (102), mounted on a shaft (136) disposed away from
and substantially parallel to the shaft (106);
iii. a plurality of taper locks (103) for securing and adjusting the position
of the perforation cylinder (101) on the shaft (106);
iv. at least one drive source for the perforation cylinder (101) and/or
pressure roller (102); and,
b) a Control System (200) for controlling the speed and position of the cross
perforation assembly (100) with respect to a web of paper traversing a webfed
rotary printing press.
2. The versatile perforation assembly as claimed in claim 1, wherein the
perforation cylinder (101) comprises:
a) a perforation roller (125) mounted on the shaft (136), the perforation
roller comprising a hollow cylinder tapered on the inside at both ends to
accommodate the taper locks (103);
b) at least one segment (115) attached at the outer curved surface of the
perforation roller (125);
c) at least a horizontal knife (110) and/or at least a segment knife (120)
attached at a plurality of locations on the segment(s).
3. The versatile perforation assembly as claimed in any of the preceding claims,
wherein the segments (115) are in the form of sections of a hollow cylinder,
comprising:
- a first curved surface (127a) and a second curved surface (127b), the
surfaces being radially spaced apart about a common axis;
- a pair of rectangular faces (128a and 128b) extending longitudinally at
distal linear edges of the curved surfaces (127a and 127b);
- a pair faces shaped as annular segments (129a and 129b) parallel to
each other;
- a plurality of segment attachment means (119) for securing the
segments (115) on the perforation roller (125) using a plurality of
fastening elements (139).
- a plurality of holes (121) on faces (129a and/or 129b) for attachment
of a plurality of segment knives;
- a plurality of holes (124) on faces (128a and/or 128b) for attachment
of a plurality of horizontal knives.
19
4. The versatile perforation assembly as claimed in any of the preceding claims,
wherein the horizontal knife (110) has at least one substantially straight,
toothed edge (134) for making perforations and a plurality of holes (133) for
securing the knife onto faces (128a and/or 128b) of a segment.
5. The versatile perforation assembly as claimed in any of the preceding claims,
wherein the segment knife (120) has at least one curved, toothed edge (132)
for making perforations and a plurality of holes (131) for securing the knife
onto faces (129a and/or 129b) of a segment.
6. The versatile perforation assembly as claimed in any of the preceding claims,
wherein the drive source comprises at least one motor coupled to at least
one shaft by a coupling means.
7. The versatile perforation assembly as claimed in claim 6, wherein the motor
is a servo motor (104) coupled to at least one shaft (106 and/or 136) by a
coupling (105).
8. The versatile perforation assembly as claimed in any of the preceding claims,
wherein the control system comprises:
i. a servo motor (104) coupled to a shaft (106) for driving the cross
perforation assembly (100);
ii. a servo drive (155) for supplying a controlled output to the servo
motor (104);
iii. an encoder (160) for keeping track of the number of rotations and
position of the shaft (106) and sending a feedback signal to the servo
drive (155);
iv. a motion controller (150) for giving a position and speed command to
the servo drive (155);
v. a central encoder (140) for providing a speed reference signal to the
motion controller (150);
vi. a human machine interface or HMI (145) for providing a command to
the motion controller (150) to start, stop or operate the servo drive
(155).
9. The versatile perforation assembly as claimed in any of the preceding claims,
comprising four segments (115, 116, 117 and 118) attached at the outer
curved surface of the perforation roller (125).
10. The versatile perforation assembly as claimed in any of the preceding claims,
optionally comprising an alternative horizontal knife (130) having at least one
substantially straight, toothed edge (134) for making perforations and a
plurality of U-shaped cuts (137) for securing the knife onto faces (128a
and/or 128b) of a segment.
20
11. The versatile perforation assembly as claimed in any of the preceding claims,
optionally comprising an annular shaped, alternative segment knife (135)
having at least one curved, toothed edge (132) for making perforations and a
plurality of holes (131) for securing the knife onto faces (129a and/or 129b)
of a segment.
12. The versatile perforation assembly as claimed in any of the preceding claims,
optionally comprising an irregular shaped knife having toothed edges
corresponding to the boundary of the shape to be perforated mounted on
one or more curved surface (127a) of at least one segment (115).
13. The versatile perforation assembly as claimed in any of the preceding claims,
optionally comprising a regular or irregular shaped die mounted on the
curved surface (127a) of at least one segment (115) for cutting of regular or
irregular shape(s) from the web.
14. The versatile perforation assembly asclaimed in any of the preceding claims,
further comprising a pressure setting screw (107) for adjusting the distance
between the outer peripheries of the pressure roller (102) and the
perforation cylinder (101).
15. The versatile perforation assembly as claimed in any of the preceding claims,
further comprising a holding bracket (138) for holding the pressure roller
(102) and absorbing backward stroke.
16. The versatile perforation assembly as claimed in any of the preceding claims,
further comprising a support structure for fitting the cross perforation
assembly (100) in a web-fed rotary printing press, the support structure
comprising:
- a plurality of mounting plates (109) fixed onto one or more side
frames (108) of the existing web-fed rotary printing press;
- a supporting beam (111) extending between the mounting plates for
supporting the pressure roller (102);
- a tie beam (113) extending between the mounting plates for
supporting the cross perforation assembly;
- a supporting bracket with bearing (114) substantially perpendicular to
the tie beam (113) and the shaft (106) of the perforation cylinder;
and,
- a plurality of bearing locks (112) for engagement with the shafts (106
and/or 136).
17. A web-fed rotary printing press comprising at least one printing section, at
least one folding section and a versatile perforation assembly as claimed in
any of the preceding claims; said versatile perforation assembly being
2 1
provided prior to the folding section with reference to the general direction
of a web of paper traversing through the printing press.
18.The web-fed rotary printing press as claimed in claim 17, wherein the
versatile perforation is provided after the printing section and prior to the
folding section with reference to the general direction of a web of paper
traversing through the printing press.
19. A method of perforating a continuous web of paper for creating detachable
advertisements, coupons, vouchers, return mailers, notices, forms, etc.,
comprising the steps of:
a) Providing a web-fed rotary printing press comprising a versatile
perforation assembly composed of a cross perforation assembly (100)
and a control system (200); the cross perforation assembly (100)
comprising:
i. a perforation cylinder (101) mounted on a shaft (106);
ii. a pressure roller (102), mounted on a shaft (136) disposed away
from and substantially parallel to the shaft (106);
iii. a plurality of taper locks (103) for securing and adjusting the
position of the perforation cylinder (101) on the shaft (106);
iv. at least one drive source (104) for the perforation cylinder (101)
and/or pressure roller (102); and,
the control system (200) comprising:
i. a servo motor (104) coupled to a shaft (106) for driving the cross
perforation assembly (100);
ii. a servo drive (155) for supplying a controlled output to the servo
motor (104);
iii. an encoder (160) for keeping track of the number of rotations and
position of the shaft (106) and sending a feedback signal to the
servo drive (155);
iv. a motion controller (150) for giving a position and speed
command to the servo drive (155);
v. a central encoder (140) for providing a speed reference signal to
the motion controller (150);
vi. a human machine interface or HMI (145) for providing a command
to the motion controller (150) to start, stop or operate the servo
drive(155);
b) adjusting the position of the perforation cylinder (101) on the shaft (106)
and attaching a plurality of horizontal knives (110) and/or segment knives
(120) at a desired location on one or more segments (115) of the
perforation cylinder (101);
2 2
c) providing a web of paper traversing through the press for printing and
passing between the perforation cylinder (101) and the pressure roller
(102) of the cross perforation assembly (100);
d) preventing relative slipping between the web passing through the
perforation assembly by keeping the peripheral velocity of the
perforation cylinder (101) roughly equal to the speed of traversal of the
web by using the control system (200);
e) creating perforations to define a tearable boundary by contacting a
plurality of teeth of the knives (110, 120) of the perforation cylinder (101)
with the web moving between the perforation cylinder (101) and the
pressure roller (102).
20. The method of perforating a continuous web of paper as claimed in claim 19,
wherein the circumference of the outer periphery of the perforation cylinder
is roughly a multiple or sub-multiple of the height of sheets cut from the web
at a folder section in the press, the height being roughly the same as the
distance between two successive cuts made on the web during folding
operation; and the peripheral velocity of the perforation cylinder (101) is
adjusted to a corresponding sub-multiple or multiple of the speed of traversal
of the web by the control system (200).
21. The method of perforating a continuous web of paper as claimed in claims 19
or 20, wherein a pair of segment knives and a pair of horizontal knives are
attached at similar opposite faces of at least one of the segments (115) of the
perforation cylinder (101) for creating rectilinear shaped perforations on the
web passing through the cross perforation assembly (100).
22.The method of perforating a continuous web of paper as claimed in any of
the claims 19 to 21, wherein the web-fed rotary printing press provided in
step (a) is a web-offset printing press.
23.The method of perforating a continuous web of paper as claimed in any of
the claims 19 to 22, further comprising the step of cutting the web into
sheets of suitable size after making perforations on the web; the suitable size
being the size of a sheet for a newspaper or other printed medium.
Dated this lltdahy of J uly 2013