FIELD AND BACKGROUND OF THE INVENTION
In the prior art printing machine mounting the intercepting bearings or
attaching the mountings to the bearings, already situated on journals of the printing
and engraved rollers, causes certain problems, because the bearings or the mountings
are on the inside of a door-like, pivotable plate, so that first the plate itself has to be
moved into its locking position and simultaneously or subsequently the mountings or
bearings have to be moved into their positions and then adjusted and locked, a feature
that cannot be observed from the outside.
In a printer of this type disclosed in DE 195 16 004A1, a plate, which is
provided with bearings for receiving the shaft journals of the free ends of the printing
and engraved rollers or with receptacles for bearings fitted on to the shaft journals, is
coupled to the frame. The plate is pivotable between a holders-down position in which
the rollers which are mounted in cantilevered fashion are accessible, and a pivoted-in
position in which the shaft journals of the free ends of the rollers are mounted on the
plate. In the known printer, additional bearings are provided on the pivotable plate, said
bearings supporting the free ends of the rollers mounted in cantilevered fashion, and
thus preventing undesired oscillations of the free ends of the rollers mounted in
cantilevered fashion, and sagging which could adversely affect the print quality. The
plate with the bearings can be removed relatively quickly and easily so that the rollers
mounted in cantilevered fashion are accessible from the outside and the print cylinder
sleeves can also be replaced easily and quickly. The print cylinders with the print
sleeves bearing replaceable printing blocks can be customary printing cylinders and
format or form cylinders.
SUMMARY OF THE INVENTION
Therefore, the object of the invention is to provide a printing machine of the
aforementioned type, in which the free ends of the floating printing and engraved rollers
can be intercepted in a simpler manner in additional bearings.
The invention solves this problem associated with a printing machine of the type
described in the introductory part in that at least one bearing block, in which the
journals of the free ends of the printing and engraved rollers are supported in the slid-in
state, can be moved in guides at right angles to the printing and engraved rollers in the
frame.
In the printing machine, according to the invention, the free ends of the floating
printing and engraved rollers can be supported in a simpler manner in additional
bearings of the bearing blocks. Because they can be moved in their guides in a
precisely defined manner between their positions, which support and release the free
ends; and the mountings or bearing mounts can be put on the journals or bearings in
a manner that can be readily observed.
To mount the journals of each pair of printing and engraved rollers, a common
bearing block can be provided. However, it would be simpler and more straight-forward
to provide bearing blocks, which can be moved counter-clockwise, for mounting the
journals of each pair of printing and engraved rollers.
Expediently the journals of the free ends of the printing and engraved rollers are
in the region of the window-like break-throughs of a side frame. These window-like
break-throughs permit, on the one hand, the impression cylinder sleeves
to be exchanged in a simple manner and, on the other hand, the guides
for the hearing block(s) can be attached to one side of each
window-like break-through.
The mounting of the bearing blocks is especially stable when
they are guided on both sides of the window-like break-throughs.
The bearings blocks can be moved by means of threaded
spindles.
Bearings, which are mounted in the bearing blocks, can be
put on the journals.
An especially preferred embodiment provides that the bearing
blocks are provided with recesses, which run parallel to their
guides and which receive the journals, and with slidable holding
heads, which can be slid into a position, which is in alignment
with the trunnions, and in said position can be put on said
heads. In so doing, the holding heads can already be designed as
the journal-supporting bearings.
If the journals comprise roller bearings, only the inner
rings are slid on the journals.
If the bearings are already put on the journals of the free
ends of the printing and engraved rollers, the holding heads form
mountings for the same.
It is expedient to provide the holding heads with mechanisms
for sideways adjustment of the bearings.
The holding heads can be moved expediently in the axial
direction of the printing and engraved rollers by means of the
pressure medium-piston-cylinder unit. In this manner the
mountings or the bearings can be slid simply and quickly in the
axial direction on the journals.
BRIEF DESCRIPION OF THE ACCOMPANYING DRAWING
One embodiment of the invention is expLained in detail with
reference to the drawings in the following.
FIG. 1 is a top view of a schematic drawing in the axial
direction of a pair of printing and engraved rollers, which are
located in a window-like break-through of a side section of a
frame, and
FIG. 2 is a partial cross sectional side view of the device
according to FIG. 1.
DETAILED DESCRIPTION
A counter-pressure cylinder 2, shown only by a part of its
circumferential line, and impression cylinders or printing
rollers 3, which can be employed at said counter-pressure
cylinder, and their assigned engraved rollers 4 are mounted in
the conventional manner, which is, therefore, not described in
detail, in a printing machine frame 1. Distributed over the
circumference of the counter-pressure cylinder 2 are several, for
example six, printing mechanisms, which exhibit printing rollers
or impressing cylinders 3, which float on moveable carriages, and
their assigned engraved rollers 4 with inking mechanisms.
The design of the bearing blocks, which bear the printing
rollers and engraved rollers so as to be unsupported, and of the
carriages, bearing said bearing bLocks, and of the carriage
guides and the mechanisms for the fast displacement and precision
adjustment of the bearing blocks are known, for example, from the
DE-GM 92 08 023 and 92 08 449, to which reference is made for a
detailed presentation of the moveable bearings.
The journals 5, 6 of the floating printing and engraved
rollers penetrate the rectangular, window-like break-throughs 7
of a side frame 8 of the printing machine frame 1.
A guide rail 9, on which carriage like bearing blocks 10, 11
can be slid parallel to themselves, is attached to the side frame
8 below the window-like break-through 7 parallel to its bottom
edge. The bearing blocks 10, 11 can be slid on the common guide
rail 9 by means of worm gears.
To position the journal 6, said journal is slid on the
bearing block 11, which is on the right in FIG. 1, by means of a
threaded spindle 13, which is freely rotatable, but immoveable in
the axial direction and which is mounted in a bracket 12 attached
to the front side of the side frame 8, and whrch penetrates the
hearing block 11 in a borehole and is screwed into a nut 14,
attached in this borehole. The threaded spindle can be driven
over a belt drive 15 by a gear motor 16, attached to the side
frame 8.
The bearing blocks can also be driven, as shown with the aid
of the left bearing block 10 in FIG. 1 for the impression
cylinder 3, by a nonrotatable and axially immoveable threaded
spindle 17, which is connected to the bearing block. The threaded
spindle 17 is screwed into a pipe, which is provided with an
internal thread and whose outer end is provided with a
synchronous belt pulley 18. The pipe 19 exhibiting the internal
thread can be freely rotated but is axially immoveable in a
bracket 20, connected to the side frame 8. The synchronous belt
pulley 18 is driven in turn by a synchronous belt 21 by means of
the gear motor 22, connected to the side frame 8.
The bearing blocks 10, 11 are provided, on the insides
facing each other, with recesses 24, 25, which are parallel to
the guide rail 9. The inner ends of these recesses bear guides
26, which run parallel to the journals 5, 6 and in which
receiving heads 2 7 can be slid in the axial direction. These
receiving heads are provided with blind holes, in which roller
bearings 28 are mounted whose inner rings can be slid on the
journals 5, 6. There are pressure medium-piston-cylinder units
30, whose piston rods are connected to the receiving heads 27,
for the purpose of sliding the receiving heads 2 7 with the
bearings 28 on the journals 5, 6 and for removal.
The pairs of printing and engraved rollers, distributed over
the circumference of the counter-pressure cylinder 2, are
provided in the conventional manner with drivers, which occur by
means of the opposing journals 32.
To remove also the printing and engraved rollers from the
counter-pressure cylinder 1, when their free roller ends are
supported in the intercepting bearings 28, the guide rails 9 run
expediently parallel to the carriages, bearing the printing and
engraved rollers, so that the bearing blocks 10, 11 can be moved
by suitably controlling the spindles, moving said bearing blocks,
by the same amounts as the carriages, bearing the same.
WE CLAIM:
1. Printer, preferably flexographic printer, having at least one back
pressure cylinder (2), at least one printing roller (3) and having at least
one forme or engraved roller (4) of a printing unit, are mounted in
cantilevered fashion at one end in the frame (1), the bearings of the
printing roller (3) and the engraved roller (4) being provided such that
they can be moved relative to the back pressure cylinder (1) in guides
and quick-release bearings (28) for receiving the shaft journals (5,6) of
the free ends of the pairs comprising a printing roller (3) and engraved
roller (4) being provided, characterized in that, at least one bearing pillow
(10,11), in which the shaft journals (5, 6) of the free ends of the printing
roller (3) and engraved roller (4) are located in the inserted state, can be
moved transversely with respect to the printing roller (3) and engraved
roller (4) in guides (9) in the frame (8).
2. Printer as claimed in claim 1, wherein bearing pillows (10, 11) which
can be moved in opposite directions are provided for supporting the shaft
journals (5, 6) of the pairs comprising a printing roller (3) and engraved
roller (4).
3. Printer as claimed in claim 1 or 2, wherein the shaft journals (5, 6) of
the free ends of the printing roller (3) and engraved roller (4) are located
in the vicinity of window-like cutouts (7) in a side frame (8).
4. Printer as claimed in one of claims 1 to 3, wherein the bearing pillows
are guided on each side of the window-like cutout (7).
5. Printer as claimed in one of claims 1 to 4, wherein the bearing pillows
(10, 11) can be moved by means of spindle drives (12-16; 17-22).
6. Printer as claimed in one of claims 1 to 5, wherein bearings which are
secured in the bearing pillows are fitted onto the shaft journals (5, 6).
7. Printer as claimed in one of claims 1 to 6, wherein the bearing pillows
(10, 11) are provided with recesses (24, 25) to their guides, which receive
the shaft journals (5, 6), and with displaceable securing heads (27) which
can be moved into a position flush with the bearing journals (5,6) and
can be fitted onto them in this position.
8. Printer as claimed in one of claims 1 to 7, wherein the securing heads
(27) are embodied as bearings which support the shaft journals (5, 6).
9. Printer as claimed in one of claims 1 to 7, wherein the securing heads
(27) form brackets for bearings which are fitted onto the shaft journals
(5, 6).
10. Printer as claimed in one of claims 1 to 9, wherein the securing
heads are provided with devices for their lateral adjustment.
11. Printer as claimed in one of claims 1 to 10, wherein the securing
heads (27) can be moved in the axial direction of the printing roller (3)
and engraved roller (4) by means of pressure-medium piston cylinder units (30).

A printing machine, preferably a flexographic printing machine, is provided with at least one counter-pressure cylinder (2) and with at least
one printing roller (3) and one engraved roller,(4) whose one end floats in the frame. To intercept the free ends of the printing roller and the engraved roller during the printing operation, the bearing blocks, in which the
journals of the free ends of the printing and engraved rollers are supported in the slid-in state, can be moved in guides at right angles to
the printing and engraved rollers in the frame.