ARRANGEMENT FOR THE SCORING OF CONTINUOUSLY TRANSPORTED, FLAT
WORKPIECES TO BE FOLDED ALONG SCORED LINES
[No other patent information provided in original document.]
The invention pertains to an arrangement for the scoring of
continuously transported, flat workpieces to.be folded along
scored lines, preferably in order to provide tubular pieces with
prefold lines in a diagonal path in order to prepare the folds of
cross bottoms to be attached thereto, composed of scoring tools
fastened to shafts that are parallel to each other, with said
scoring tools having one part composed of a groove (female mold)
and the other part composed of a ridge (male mold), which take a
helical path over the external cylinder described by the same and
which engage with each other in the contact region of their
surface lines, where in order to set the length of the scoring
lines, or prefold lines, a part of the tool is composed of
packages of tightly fitting discoid or plate-type segments that
carry the scoring tools, of which segments at least one is
retained on the shaft in a pivoting manner and can be fixed at
different angles.
A scoring arrangement for the provision of diagonal scorings
at the ends of flat-lying tubular pieces in [paper}' bag
manufacture is known from DE-GM 1,964,069, which diagonal
scorings form the prefold lines for cross bottoms to be attached
to the tubular pieces. In this known arrangement, two segments
respectively, which carry scoring tools, are clamped to each of
two shafts that are parallel to each other; the angle of the
segments can be changed with respect to each other such that when
adapting to different formats, both diagonal scorings can be
jLtsapt;cuxvei.y provided at the ends of the tubular pieces in one
station-
In order to widen the lateral tucks to be partially folded
over the corner tucks, composed of triangular pockets of bottom
squares that have been drawn up, it is common to provide the cut
ends of tubular pieces with two incisions that are parallel to
each other. If diagonal scdrings are executed over these
incisions, the triangular pieces partitioned off by this means
have a tendency to fold upward around the scored lines such that
the forward triangular pieces form hems that obstruct a perfect
further processing and can lead, by this means, to disruptions of
the operation. In order to avoid this type of disturbance, it is
nocccoary to execute a diagonal ocuilny on the rorward Side Of a
tubular piece transported in a transverse sense, which starts
from the forward edge of the fold and goes to only to the point
of the incision, such that a scored line that partitions off a
triangular piece is avoided.
With arrangements known from DE-GM 1,964,069/ the length of
diagonal scorings cannot be adapted in order to adapt to the
incisions that widen the lateral flaps of the bottom.
7m arrangement of the aforementioned type is known from a
brochure by the Windmoller & Holscher company, "AD 2366/AD 2368"
(with printing note: 15/82/987/T 1,5) for which, however, a pair
of scoring rolls is provided for each of the two prefold lines
having a diagonal path and to be provided at one end of a tubular
piece. In this known arrangement, the length of scored lines can
be set by a twisting and fixing anew of segments that carry the
scoring tools, yet this known arrangement is costly inasmuch as
two pairs of scoring rolls respectively must be provided in order
to provide the two diagonal scorings at the ends of the tubular
pieces.
The purpoae of the invenLluii la tnererore to create an
arrangement of the aforementioned type, for which two diagonal
scorings can -iaesjexecuted at the ends of tubular pieces where
there is a possibility for setting the length of the forward
diagonal scored line to incisions on the end with only one pair
of scoring rolls.
In accordance with the invention, this problem is solved for
an arrangement of the aforementioned type by means of the fact
that a cylindrical saucer-type segment of a second scoring tool
is retained on each shaft, and that one segment is provided with
a groove in the form of a helix and the other segment is provided
with a ridge in the form of a helix, which engage with each other
in the contact region of the cover lines of the external
cylinders described by the same.
The arrangement in accordance with the invention is
distinguished by the fact that individual sections of the
segments carrying the scoring tools can Joe twisted relative to
each other, without being obstructed by means of the second
scoring tool, in order to set a desired length of the forward
diagonal scored line.
It is provided for in accordance with an advantageous
configuration, such that the axial pnds nf var-v, ^-f +-k<* +-,..~
cylindrical saucer-type segments of the second scoring tool are
connected by means of a radial stay to each hub, fastened to the
shafts, and such that a part of the former, which projects in an
axial sense, overlaps the rings or disks, which can be connected
to the shafts, with such rings or disks being connected to the
segments carrying the first scoring tools. This configuration
easily enables the parts carried by each shaft of the two scoring
tools to be located, during their rotation, on a common external
cylinder in the manner required.
A particular problem exists in fastening the disks, or
segments, which can be twisted with respect to each other in
order to set tKe niiesired length of the scored line, to the shjiftt
at the correct angle. In order to achieve this, it is provided
for in accordance with the invention that one end hub or end disk
can be connected to each shaft in a manner preventing twisting
and that in order to locate the package of segments that can be
twisted, the same can be placed under tension against the hub by
means of a tensioning device. The sole hub or disk, which can be
connected to each shaft in a manner preventing twisting, can also
carry a segment of the first scoring tool.
In an additional configuration of the invention, it is
provided for that each of the two hubs that can be connected, in
a manner preventing twisting, to each shaft carries, by means of
a stay, a cylindrical saucer-type segment that features a scoring
tool, with this segment projecting in the opposite direction of
the' cylindrical saucer-type segments of the second scoring tool.
Each tensioning device can be composed of saucer springs,
one side of which is supported by an annular collar'of the shaft
and the other side of which is supported by means of a movable
bushing mounted on the shaft, with said bushing in turn being
supported by the rings or disks that carry the segments. To lift
the tension acting on the rings or disks, in order to twist the
same, the bushing can be provided with an annular flange engaged
by a rocking arm mounted on the rolling stand and that moves the
bushing in the direction of the saucer spring. Each rocking lever
can be composed of a double-armed lever that can be swung by
means of a cam plate.
In an additional configuration of the invention, it is
provided for that the rings or disks carrying the segments of the
first scoring tool are provided with channels, concentric to the
shafts, Jftjii'qh are engaged by pins mounted to adjacent, rings or
disks.
It is advantageous for the scoring tools of the segments to
be located on a helical line when the pins are located directly
against one end of the channels. In this way, the rings or disks
can be aligned relative to each other in a simple and quick
manner for the purpose uf extending the length of a scored line.
It is preferable for the parts of the scoring tools of both
rolls to be divided into segments that can be twisted relative to
each other. It is provided for in accordance with an additional
preferred embodiment that the segments of both parts of the
scoring tools are located in an offset manner with respect to
each other in such a way that they cannot engage with each other
when the pins are located directly against the other end of the
channels. It is necessary to twist the segments of both
cooperating shafts of a scoring tool in this manner, e.g., ..if the
two tool parts that execute the diagonal scorings must be brought
Very Close tO each Othsr fnr narrouor tufoulas- pioooo.
The clearance of the two scored lines, situated at right
angles to each other can be set only by means of turning the
segments of the first scoring tools. However, the clearance can
also be set by means of connecting the cylindrical saucer-type
segments of the second scoring tools to the shafts by means of a
detachable clamped joint.
In accordance with an additional preferred embodiment, it is
provided for that each shaft is composed of a hollow shaft and a
shaft mounted in the former, that the first scoring tools are
mounted or fastened to the hollow shaft and the second scoring
tools are fastened to the journals of the shaft, with said
journals projecting beyond the hollow shaft, and that each shaft
~cand each hollow shaft are provided with toothed gears that
l! -separately drive the same. This configuration enables the
clearance of the diagonal scored lines from each other to be
adjusted or fine-tuned in a simple manner, by means of only a
relative twisting of the toothed gears.
An embodiment of the invention is explained in greater
detail in the following with the aid of the figures. These
include:
Figure 1: A side view of the scoring arrangement in
accordance with the invention, in diagrammatic representation,
Figure 2: A top view of the scoring arrangement of Figure 1
with two workpieces for bags, with the workpieces consisting of
tubular parts, of which the forward end has already been provided
with diagonal scored lines,
Figure 3: A view of the pair of scoring rolls in the
direction of arrow III-III in Figure 2, in enlarged view,
Figure 4: A side view of the pair of scoring rolls in
accordance with Figure 1, in enlarged view,
Figure 5: A cross section through the pair of scoring rolls,
along line IV-IV in Figure 4,
Figure 6: One development of the upper scoring roll,
Figure 7: One development of the lower scoring roll of the
pair of scoring rolls, and
Figure 8: A workpiece for a bag, which has passed through
the pair of scoring rolls, with a scoring caused by means of
setting the pair of scoring rolls in accordance with Figures 6
and 7,
Figures 6a
,ls to 8a: Diagrams that correspond-to^Figures 6-8, for which
• vthe segments, which can be twisted, of both scoring rolls of the
pair of scoring rolls has been set for a narrower workpiece of a
bag,
Figure 9: One development of a cut by means of the lower
scoring roll of a pair of scoring rolls, along line IX-IX in
Figure 4 and
Figure 10: A section through the lower scoring roll, along
line IX-IX in Figure 9.
A pair of scoring rolls (1) is evident in side view from
Figure 1, through the gap between which scoring rolls—by means
of fl dnnhl i?-b©lt conveyor (2) and. likcwioc in diagrammatic
representation only—transverse paper tubular pieces are
transported for the manufacture of paper bags. The double-belt
conveyor (2) is composed of two continuous belts that, between
the pair of scoring rolls (1,1') evident from Figure 2, act upon
paper tubular sections (6,6*), transported in a transverse sense
such that the ends of the tubular sections that have been
provided with cut edges can pass through the gap between the pair
of scoring rolls (1,1') for the purpose of being scored.
The pairs of scoring rolls (1,1'} are configured to be
mirror-images of each other from the transverse center plane,
such that only the pair of scoring rolls (1) is described in
further detail.
The upper scoring roll (3) of the pair of scoring rolls (1)
is of the same fundamental construction as the lower scoring roll
(3'), but with the difference that the lower scoring roll (3'),
in order to form scored lines or prefold lines, is provided with
helical grooves (female molds) and the upr>er scorino mil in -i <=
provided with ridges (male molds) that engage with these grooves.
The cut edges (7,7') of tubular pieces (6) of single-ply or
multi-ply paper are provided with incisions (8) that are parallel
to the forward and follow-up lateral edges, with such incisions,
after the sides of the tubular pieces provided with cut edges
have been drawn up into bottom squares, leading to the formation
of wider lateral tucks or lateral flaps, that, after being folded
over the triangular pocket-shaped corner tucks, lead to improved
bottom designs. However, a bottom with a good design is
guaranteed only if the later diagonal fold lines of the corner
tucks aju<= aouiea in oraer co rorm pretoid lines. This type means
that scorings, grooved in cross section, are impressed in
flat-lying paper tubular pieces, with such scorings having the
tendency of raising the sections of the tubular pieces that have
been partitioned off by said scoring. In order to avoid this
raising, the forward side of tubular pieces transported through
the pair of scoring rolls (1,1') in the direction of arrow A are
provided only with short diagonal scored lines (9), Which start
from, the forward lateral edge and terminate in the end region of
the forward incision .(8) . If the scored line (9) were to be
executed in a continuous manner up to the cut edge (7), the
triangular piece formed by nutans nf thp» inr.isinn' (8) would have a
tendency to raise up around the base formed by the scored line,
such that the cut edge of the triangular piece formed by means of
the incision (8) would form a hem that would obstruct a perfect
further processing of the tubular section. This toiding out or
the triangular piece also cannot be prevented, in the execution
of continuous diagonal scored lines, by a later providing of
incisions (8), since tension generated by providing scored lines
cannot be reduced quickly enough.
In contrast:-, the follow-up diagonal scored line that meets
the inner end of the follow-up incision (8) can be in a
continuous execution up to the cut edge (7) since a possible
raising of the triangular piece partitioned off by means of the
scored line (10) does no harm, because the incision (8) cannot
form a hem with the triangular piece since the hem follows and is
therefore pressed down to the plane of the tubular piece when
pushing against the triangular piece that has been partitioned
off.
The scoring rolls (3,3') of the pair of the scoring rolls
(1) are provided with two segments (4,4'; 5,5') respectively,
which form the scoring tools.
The scoring rolls (3,3') possess first segments composed of
cylindrical saucers (4,4'), of which, segment (4') is provided
with a helical groove and segment (4) is provided with a
corresponding helical ridge (13) (Figure 5), which engage with
each other for a passage though the gap formed between the
scoring rolls.
The scoring rolls (3,3') are provided with additional
segments (5,5')/ of which the lower segment is provided with a
helical groove and the upper segment is provided with a
corresponding helical ridge (16), that, when passing through the
gap formed between the rolls, engage with each other in the
manner evident from Figure 5.
The first scoring tools formed by means of segments (5,5')
execute short diagonal scored lines (9), adjustable in length,
with such lines commencing at the forward folded edges of the
tubular pieces and ending in the region of the inner ends of the
forward incisions (8). The scoring tools formed by the segments
(4,4*) execute diagonal s,cored lines, which take a continuous
path from the cut edge (?) to the follow-up folded edge.
The left end regions of the cylindrical shells (4,4')
forming the second scoring tools are connected, in accordance
with Figures 3 and 5, by means of radial stays (17, IT) to the
shafts (19,20) of the scoring rolls. In order to make this
connection, the stays (17,17') are provided with lower jaws
having saucer-type recesses, the approximately semicircular
profile of which has a radius corresponding to the shafts (19,20)
of the scoring rolls. Counter jaws (18,18*) are provided for
clamping to the shafts of the scoring rolls, with said counter
jaws featuring identical saucer-type recesses and, by means of
screws, not shown, along with jaws formed as a unit with the
stays (17,17'), can be placed under tension in order to be
clamped onto the shafts (19,20) of the scoring rolls. After
detaching the-.straining screws, not shown, the segments (4,4')
can be twisted, relative to the segments (5,5'), on the shafts
(19,20) of the scoring rolls, in order to set the format and to
be placed under tension with the shafts in settings that have
been newly set.
The first scoring tools formed by segments (5,5') have a
discoid construction. This discoid construction is now explained
in greater detail with the aid of Figures 3 and 5, which
represent a section along line IV-IV in Figure 4, through a pair
of scoring rolls.
Hollow shafts (23,24) are mounted on a lateral wall (22) of
the machine rolling stand by means of roller bearings (25,26).
The outer ring of the roller bearing (25) is retained in an
eccentric bushing (27) that rotates in the lateral rolling stand
(22), such that by means of rotating this bushing, the axle
clearance uyf the shafts (23,24) can be set in order to adjust for
tubular ..sections of different thicknesses. Intermeshing toothed
gears (28,29) are fastened by means of keys to the journals of
the hollow shafts (23,24) projecting past the lateral rolling
stand (22).- The shafts (19,20), to which cylindrical saucer-type
segments (4,4") are clamped in the manner described, are mounted
in hollow shafts (23,24). Toothed gears (30,31) are fastened by
means of keys to the journals of the shafts (19,20), with such
journals projecting past the hollow shafts (23,24).
In normal operation, the toothed gears (28-31) are driven at
the same speed. However, in order to change the clearance between
the diagonal scored lines (9,10), or in order to, precisely
fine-tune this clearance, a short-term supplemental rotation can
be imparted to one of the pairs of toothed gears (28,29;30,31),
e.g., by means of a differential gear. Such a supplemental speed
permits the clearance between the diagonal scored lines (9,10) to
be changed, for a format switch, without the need to loosen a
clamping of segments (4,4") on the shafts (19,20).
Cylindrical hubs (32,33) are fastened by means pf keys to
the inner ends of the hollow shafts (23,24), with such hubs
carrying cylindrical saucer-type segments (36,37) by means of
stays (34,35), the outer cover pieces of which such segments are
provided with a groove (15) and ridge (16). Disks (38,39;38'39')
are pushed on the hubs (32,33) and disks (40-43;40'-43') are
pushed on the hollow shafts (23,24), which disks freely rotate
relative to each other and are supported by each other. The inner
disks (38,38') pushed onto the hubs are supported by annular
flanges (44,44') of the hubs. The disks (38-43;38'-43 *), of equal
diameter, are placed under tension with each other by means of
saucer springs (45,45') and bushings (46,46'), where one side of
the saucer springs (45,45') is supported by the bushings (46,46')
and the other side is supported by, the flanks (47,47') of annular
collars of the hollow shaft. In the setting evident from Figure
5, disks (38-43;38'-43') are placed under tension with each other
by means of saucer springs in such a way that they are retained
in a manner preventing a relative rotation. In order to be able
to twist the disks relative to each other to set the length of
the sgored lines (9)—which is described in greater detail in the
following—the bushings (46,46') are provided with annular
flanges (48,48'), which can be engaged by the shorter lever arms
(49,49') of double arm levers pivoted on the lateral rolling
stand (22) around axles (50,50*), the longer lever arms (51,51')
of which levers can be can be swung by means of eccentric cams
(52,52') pivoted in the lateral rolling stand. If the saucer
springs (45,45'J are compressed by double-arm rocking arms
(49,51;49',5.1'), the disks {38-43;38«-43') can be twisted
relative to each other.
The disks (38-43;38'-43') carry approximately rectangular
segments (55,55') in the manner evident from Figures' 3 and 10 in
top view, which segments [55,55'] are provided with ridges (16)
and grooves (15). The grooves (15) are located on the same
external cylinder as the grooves (12) of the segments (4) and the
ridges (16) are located on the same external cylinder as the
ridges (13) of the segment (4).
The height of the segments (55,55') is great enough so that
the disks that carry the segments can be covered by the
projecting parts of the cylindrical saucer-type segments (4,4').
The disks (38-43;38'-43') are provided with channels (60),
in the manner evident from Figure 9, which shows a section
through the disks along the straightened line IX-IX in Figure 4.
Pins (61) engage with these channels, with such pins being
retained with a^FeTis fit in bore holes of the adjacent segments
(37) or adjacent disTcs (38'-42'}. The length of the channels is
dimensioned such that the scored grooves (15) or the scored
riria