CH622464A5 - Device for attaching and tensioning flexible printing formes - Google Patents

Description

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PATENT CLAIMS 13. Device according to claim 9, characterized in

1. Device for fastening and tensioning bendable, that both eccentric disks (39, 51) are each the same, men printing plates (2) on the forme cylinder (1) of a Rota 14. Device according to claim 1, characterized thereby with printing press several in an axially parallel net, that an eccentric actuator as in a slidable pit (3) rotatably mounted clamping bodies (4, 5 in the clamping flap (4), on the adjacent group 5,6) and thereby to clamp the plates together - Supported wedge-engaging eccentric pin-acting clamping springs (10), whereby the clamping body is formed as.

in each case one foot (5) through which the axis of rotation runs, and the 15th device according to claim 1,

an approximately vertically attached leg (6) so that the compression springs (30) with their clamping flap (4)

having tension flaps (4) are formed which are inserted into the pit floor by means of the end facing away from the "10

Engage the area of the cylinder (1) of the supported compression springs (13, 30) in the female connector (35).

Clamping direction can be acted upon and to relax by means of the 16th device according to claim 15, characterized in

an actuating device can be actuated, characterized in that the spring strip (35) approximately in the central region of the net, that the actuating device is arranged at least one pit cross section in the cylinder (1).

stored, each with at least one associated clamping device according to claim 7, characterized

Flap (4) cooperating actuator (14.39) net that the tension flap (4) to form an abutment which with means (17, 54) for connecting an actuation in the area of the adjacent pit side wall approximately

Tool (55) is provided. has roof-shaped contour (32), the tip (33) of which without

2. Device according to claim 1, characterized, substantial play is guided along the pit wall. that an eccentric actuator as parallel to the associated 18 18th device according to claim 1, characterized by a tension flap (4) in the forme cylinder (1) eccentric spin- a one-piece, in the area of each pit a pressure surface del (14) is formed, on the circumference of which the associated plate clamping spring (45).

th flap (4) facing ends of the pressure springs (13) acting thereon are supported.

3. Device according to claim 2, characterized in that 25.

that between the eccentric spindle (14) and the spring end in each case an extension of the compression spring (13) in question. The invention relates to a device for fastening bar-mounted pressure pin (19). and clamping flexible pressure plates on the molding

4. Apparatus according to claim 2, characterized in that a rotary printing machine with several in one that the axially outer clamping flaps (4) 30 axially parallel pit rotatably mounted adjacent eccentric spindles (14) as hollow spindles and clamping bodies for clamping the plates in each case forms and of a cooperating clamping springs extending to the cylinder edge, wherein the clamping body adjusting rod (16) passes through the adjacent eccentric spindle as a foot through which the axis of rotation runs and are. a leg attached approximately perpendicular to the foot

5. The device according to claim 2, characterized in that 35-pointing clamping flaps are formed, which by means of adjacent eccentric spindles (14) are coupled with each other in the clamping rich bar of the cylinder. actionable and to relax by means of a

6. The device according to claim 1, characterized in that the device can be actuated.

that the compression spring (13) in the extension of the flap-Such a device is described by CH-PS 609 914

kels (6) are arranged in the forme cylinder (1). 40 have already been proposed.

7. The device according to claim 1, characterized, expediently, the operator has that an eccentric actuator as a stored in the pit floor after actuation of the actuating device both hands free, and eccentric disc (39) is formed, each with one to be inserted to be exciting Plates. The full awareness of the nose (40) molded onto the associated tension flap (4) can advantageously interact with the insert. 45 process. With the one already proposed.

8. The device according to claim 7, characterized in that the device, however, should include a worm gear for rotating the eccentric discs (39) in each case rotatably on a fixed hen of the associated clamping flap using the fin axis (42) of an insertable into the pit floor. A flap actuator of this type proved gene bearing housing (41) are guided. however, both in terms of space requirements and

9. The device according to claim 8, characterized in 50 serviceability as relatively expensive.

that the bearing housing axes (42) each have another, freely starting from this, it is therefore the task of the present rotatably mounted eccentric disc (51) to relax the invention, in a further development of the aforementioned device clamping spring (45) in the area of the tensioning flap (4) against a simple, yet reliable clamping flap, overlaying pressure surface. To create device that housed and space-saving

10. The device according to claim 9, characterized gekennzeich- 55 even with a larger number of clamping plates per net that the clamping spring (45) a flattened, rotatable ge cylinder width can be handled easily and easily, encompasses the stored pin (48) Using a molded-on solution to this problem, a finger (49) with the associated eccentric disk (51) and the type mentioned at the beginning interacts in a surprisingly simple manner in that the actuating device has at least one bearing mounted in the cylinder, each with at least one assigned clamping

11. The device as claimed in claim 7, characterized in that the flap cooperating actuator has a net, that the centering disks (39, 51), which are mounted on a common axis (42) and are connected to one another for connecting an actuating tool, are radially facing one another. This means that grooves (53, 54) for connecting a slewing gear and thus advantageously a particularly time-saving tool (55) can be operated quickly and conveniently. 65 and still exact plate assembly and disassembly safe-

12. The device according to claim 11, characterized marked. The advantages of the measures according to the invention that the turning tool (55) has an approximately T-shaped cross section are therefore particularly economical. to see.

3rd

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According to a first embodiment of the invention, for example, the eccentric actuator can be designed as an eccentric spindle mounted parallel to the associated clamping flap in the forme cylinder, on the circumference of which the ends of the compression springs acting against the assigned clamping flap are supported. In a device of this type, the compression springs are arranged in the extension of the flap leg in the forme cylinder. By actuating the aforementioned eccentric spindle, the pressure springs acting in the closing direction are relieved and the relaxation process is initiated.

In a device of the aforementioned type, a push pin which is displaceably mounted in an extension of the respective compression spring can advantageously be arranged between the eccentric spindle and the spring end. This ensures that the spring length and thus also the spring force can be adapted to the needs of the individual case, and yet a sufficient distance can be provided between the eccentric spindle and the pit, which can have a positive effect, particularly in terms of design.

In the case of cylinders with several clamping flaps arranged next to one another, each clamping flap is expediently assigned its own eccentric spindle. In this case, the eccentric spindles assigned to the outer clamping flaps can advantageously be designed as hollow spindles and can be penetrated by an adjusting rod of the adjacent eccentric spindle that extends to the cylinder edge. This ensures that each clamping flap can be actuated individually without further ado, which has a particularly positive effect when the forme cylinder is updated. The disks not affected remain completely unaffected by the necessary disk change.

On the other hand, when clamping the printing plates for so-called panorama pages, it can be advantageous that adjacent eccentric spindles can be coupled to one another. After actuating the clutch, which e.g. can be designed as a simple pin coupling, the corresponding number of flaps can be operated together.

The above-mentioned first exemplary embodiment and the continuing measures described in this context are particularly suitable for forme cylinders with welded constructions, since here there is enough space available in the cylinder cavity without special machining being necessary.

Another particularly simple embodiment of the invention can consist in the fact that an eccentric actuator is designed as an eccentric disk mounted in the pit floor, which interacts with a nose formed on the associated tensioning flap. A device of this type can advantageously be provided in the area of each tensioning flap without any particular effort, so that there is easily a possibility for individual actuation of the tensioning flaps, which, as already indicated, has a positive effect, in particular when updating. In addition, these measures obviously result in a particularly light and therefore also inexpensive construction in terms of the use of materials.

The eccentric discs are expediently each rotatably mounted on a fixed axis of an associated bearing block that can be inserted into the pit floor. The bearing block together with the axis and the eccentric disc can advantageously be assembled outside the cylinder pit and inserted into the pit floor as a pre-assembled unit. Processing, assembly and disassembly are particularly easy.

The plate clamping springs for clamping the plates to be clamped are preferably formed in one piece and have a pressure surface in the area of each pit side. In the relaxed position of the tensioning flap, the pressure surface of the plate clamping spring on this side is released. If ventilation of the opposite pressure surface of the plate clamping spring is also desired, the bearing block axes 5 can each accommodate a further, freely rotatably mounted eccentric disk for relieving the clamping spring in the region of the pressure surface opposite the tensioning flap. This ventilation option has a particularly positive effect on offset plates, which are known to be very thin and therefore relatively sensitive. The clamping spring can expediently encompass a flattened, rotatably mounted pin which interacts with the associated eccentric disk via a finger integrally formed thereon.

In order to achieve a simple actuation option 15, the eccentric disks arranged on a common axis for actuating the tensioning flap on the one hand and the clamping spring on the other hand can each have facing radially extending grooves for connecting a turning tool, which advantageously has an approximately T-shaped cross section.

The above-mentioned second embodiment of the invention and the associated further measures can advantageously be used particularly when the compression springs engage, for example, to achieve a particularly large lever arm with their end facing away from the tensioning flap into a spring strip that can be inserted into the pit floor. To prevent the tension flap from bending, it can have an approximately roof-shaped contour to form an abutment in the area of the adjacent pit side wall, the tip of which is guided along the adjacent pit wall without substantial play.

A further advantageous embodiment of the invention can also consist in the fact that an eccentric actuator is designed as an eccentric pin which engages in a part which is slidably mounted in the tensioning flap and is supported on the adjacent pit wall. An arrangement of this type has a particularly advantageous effect if small pivoting angles are sufficient.

Further advantages of the invention result from the following description of some exemplary embodiments with reference to the drawing.

Here show:

1 shows an embodiment of the invention with an eccentric spindle based on a cylinder cross section in a schematic representation,

2 shows a section through an exemplary embodiment with compression springs inserted into a female connector,

3 shows a section through the associated adjusting device with an eccentric disc 50 mounted in the pit floor,

4 the adjusting tool belonging to the exemplary embodiment according to FIG. 3 in cross section and

Fig. 5 shows a section along the line V-V in Fig. 3 with two positions of the eccentric according to the invention. 55 In FIG. 1, the outline of a forme cylinder of a rotary printing press is indicated at 1, on which a flexible printing plate 2 is to be clamped. For this purpose, the angled ends of the flexible pressure plate 2 interact with a clamping and clamping device arranged in a cylinder pit 3. Said clamping and tensioning device consists of a flap 4 which is rotatably mounted in the pit 3 and has a foot 5 through which the axis of rotation runs, and an approximately vertically attached leg 6 which cooperates with the end of the plate. Furthermore, a further, here approximately L-shaped support part 7 is arranged on the side of the pit 3 opposite the flap 4, which is firmly screwed to the cylinder with its foot 8 and with its leg 9 to the further plate end

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cooperates. For clamping the angled plate ends in the area of the legs 6 and 9 of the flap 4 and the support part 7, plate clamping springs 10 provided with corresponding pressure surfaces can be provided in the area of both legs. Instead of single plate clamping springs 10, it would also be conceivable to provide a one-piece clamping spring, which is fixed, for example, on the support part 7 and extends into the region of the tensioning flap 4. In the leg 9 of the support part 7, a threaded bushing 11 is also provided with an adjusting screw 12 engaging therein. In this way, the leg 9 can be elastically deformed to a certain extent, so that it can be adjusted or adjusted. This has a particularly favorable effect when clamping high-pressure plates, which are known to be relatively stiff.

In the extension of its leg 6, a plurality of compression springs 13, which are distributed uniformly over its length, act on the tension flap 4, which cause the leg 6 of the tension flap 4 to bear against the corresponding pressure surface of the associated plate clamping spring 10 and thus clamp and tension the flexible pressure plate 2. To relax the flexible pressure plate 2, the flap 4 must therefore be rotated against the force of the compression springs 13. In order to facilitate this, an eccentric spindle 14 which is rotatably mounted in the cylinder 1 and is assigned to the clamping flap 4 is provided.

The arrangement described above and shown in FIG. 1 can expediently be used in cylinders designed as a welded construction. A further exemplary embodiment is explained in more detail below with reference to FIGS. 2 to 5, which is expediently tailored to use with cylinders made from solid material. However, the basic structure of the arrangement described above is also retained in this exemplary embodiment. For the same parts, the same reference numerals can therefore be used for simplicity.

In Fig. 2, a compression spring is indicated at 30, which engages approximately from the center of the pit at the foot 5 of the clamping flap 4. The foot 5 can easily be made relatively high here, so that a correspondingly high clamping torque is reached. To ensure that the compression springs 30 are securely seated, the foot 5 can have a spring contact surface 31. However, the direction of force, which is approximately perpendicular to the leg 6 of the tensioning flap 4, results in a load on the tensioning flap 4 directed towards the pit side wall. If the tensioning flap itself is no longer able to take up this load, support is advantageously provided in the area the adjacent pit side wall possible. For this purpose, the tensioning flap 4 preferably has, in the area of the pit side wall,

see, by means of which the compression springs 13 can be loaded or unloaded. 25 as indicated at 32, approximately roof-shaped contour, whose

In the drawn position of the eccentric spindle 14, in which the compression springs 13 face the full eccentricity, the full load state, that is to say the clamping position, has therefore been reached. On the other hand, when the eccentric spindle is rotated by approximately 180 °, the pressure springs 13 are relieved, so that the corresponding end of the flexible pressure plate 2 can easily be brought out of engagement with the leg 6 of the rotatably mounted tensioning flap. For this purpose, the eccentric spindle 14, as indicated at 15, can be provided with a slot or a square in the area of one end, to which a corresponding key etc. can be attached. The eccentric spindle 14 can extend over the entire cylinder width, or each clamping flap 4 can be assigned its own eccentric spindle. In the first case, all flaps can only be operated simultaneously, which can be advantageous in some cases. In the second case, single actuation is possible. To enable lateral operability, the eccentric spindles arranged laterally on the outside, such as the eccentric spindle 14 in FIG. 1, can be designed as hollow spindles, the recess of which is penetrated by an adjusting rod 16 of the adjacent eccentric spindle which extends to the cylinder edge. The adjusting rod 16 can e.g. also be provided with a square 17, etc., on which a key can be attached.

Tip 33, which can conveniently be slightly rounded, is guided along the pit wall without substantial play. This easily results in a certain abutment for absorbing the spring forces of the compression springs 30, so that elastic deflections of the tensioning flap 4 are prevented. Nevertheless, an unrestricted pivotability of the tension flap 4 is guaranteed. The compression springs 30 acting from the pit center at the foot 5 of the tensioning flap ~ 4 can be held cheaply in a spring bar 35 which can be inserted firmly into a corresponding recess 34 in the pit floor. Appropriate blind bores 36 are expediently provided in the strip 35 for this purpose. The strip 35 can be machined in an advantageous manner independently of the cylinder 1 and can subsequently be inserted from the pit opening 40 37 into the pit produced by two mutually inclined milling or saw cuts and screwed to the pit bottom, so that in this embodiment as well, the pit can be easily manufactured or easy maintenance and repair of the clamping and clamping device is ensured. The female connector 35 is therefore advantageously arranged approximately in the central region of the pit cross section. This makes it possible to produce the recess 34 by means of a simple saw or milling cut. The tensioning flap 4 is in the region of its ends. If a joint actuation of adjacent flaps 50 is expediently desired to rotate in bearing blocks indicated at 38, as is the case, for example, with panorama plates, it is expedient to hold it.

a coupling, such as a pin coupling, etc., is provided. In an arrangement of this kind is intended to relax the

Fig. 1 is such a coupling for the sake of clarity means for pivoting the flap 4 against the not shown. The eccentricity of the eccentric force of the compression springs 30 is expedient, and a spindle 14 indicated at 39 is expediently chosen such that self-locking occurs. 55 Eccentric disc can be used, the one with the

The spring ends facing away from the flap 4 of the pressure foot 5 of the flap 4 cooperate with the nose 40, which protrudes into the corresponding bores 18 in the cylinder 1. The disc plane of the eccentric disc 39 has an advantageous grip, can be directly on the circumference of the eccentric spindle 14. roughly parallel to the middle of the pit. This is one to be supported. In the illustrated embodiment, however, it is possible to produce a corresponding recess in the 60 pit floor between the eccentric spindle 14 and the spring end for accommodating the eccentric disk 39 and simple machining and assembly of the eccentric disk bearing.

The arrangement and mounting of the eccentric disk 39 can best be seen from FIG. 3, which shows a cylinder cross section that detects the eccentric disk 65 39. The eccentric disk 39 for rotating the tensioning flap 4 against the force of the compression springs 30 is advantageously mounted in a box-shaped bearing housing 41, which is approximately an extension of the one shown in FIG.

Pressure pin 19 is provided, which is also displaceably arranged in the cylinder bore 18 in the extension of the associated compression spring 13. This ensures a sufficient distance of the eccentric spindle 14 from the pit 3, so that even with cylinders designed as a welded construction, a simple yet reliable mounting of the eccentric spindle 14 is ensured by means of bearing rings etc. indicated at about 20.

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3 not visible female connectors 35 is embedded in the pit floor. The box-shaped bearing housing 41 contains a bearing pin 42 supported on both sides, on which the eccentric disk 39 is rotatably guided. The box-shaped bearing housing 41 is expediently screwed to the pit floor, as can be seen in FIG. 5. The bearing housing together with the bearing pin and eccentric disc can therefore advantageously be preassembled outside the pit and inserted as a pre-assembled unit in a corresponding recess 43 in the pit floor. Likewise, a simple disassembly of the entire structural unit, for example for repair purposes, etc., is possible by loosening the screws 44. As a result, the assembly effort is not insignificantly reduced. The bearing housing 41 with the eccentric disk 39 is expediently arranged such that the eccentric disk 39 can be brought into engagement with the latter about approximately in the central region. The female connectors 35 for the compression springs 30 can therefore be approximately symmetrical to the center of the bearing housing 41. In this way, a precisely symmetrical loading of the tensioning flap 4 is advantageously achieved, which has a positive effect on the deflection.

In the position of the eccentric disk 39 indicated by solid lines in FIG. 5, the eccentric disk 39 is evidently out of engagement with the clamping surface formed by the nose 40. When the eccentric disk 39 is rotated by means of a clamping tool that can be inserted from the pit opening 37, for example a rod that can be inserted into a circumferential recess of the eccentric disk 39, the eccentric disk comes into engagement with the position indicated by dash-dotted lines and rotates the clamping flap 4 by an angle predetermined according to its eccentricity against the force of the compression springs 30. As a result, the leg 6 of the tensioning flap 4 is lifted off the corresponding pressure surface of the plate clamping spring and the end of the clamped pressure plate 2 is released. The eccentricity of the eccentric disk 39 is advantageously selected such that self-locking is provided in this relaxation position, so that the operating personnel have both hands free for inserting or removing the desired pressure plate after actuating the eccentric disk 39.

Preferably, in devices of the type according to the invention, a one-piece plate clamping spring is used, which is provided in the area of the tensioning flap 4 and the opposite support part 7 with corresponding pressure surfaces. In Fig. 3 such a plate clamping spring is indicated at 45, which is expediently screwed at one end to the support part 7 and extends with its other free end into the area of the clamping flap 4. In the illustrated embodiment, the plate clamp spring 45 is angled several times to increase the spring travel. By moving the tensioning flap 4 into its relaxed position, however, the distance to the free end of the plate clamping spring 45 is released. The corresponding end 46 of the pressure plate 2 can therefore be easily inserted or removed. The end 47 of the pressure plate 2 to be clamped on the support part 7 is generally simply inserted between the corresponding clamping surfaces of the plate clamping spring 45 and the leg 9 of the support part 7. In the case of 5 clamping thin sensitive plates, such as offset plates, however, it is advantageous if the corresponding pressure surfaces can be ventilated in the area opposite the clamping flap 4. For this purpose, the plate clamping spring 45 is underlaid in the region of the leg 9 of the support part 7 by a flattened pin 48 which is rotatably mounted in a corresponding depression of the leg 9. As shown, the pin 48 can engage a guide groove 50 of a further eccentric disk 51 with a finger 49 formed thereon, or can be in contact with the outer circumference or the edge of the eccentric disk 51 with an offset or an inclined surface. In the latter case, the same parts or a correspondingly broad disk could expediently be used for both eccentric disks 39 and 51. A finger pressure spring could preferably be provided here. The eccentric disc 51 can preferably also be rotatably mounted on the bearing pin 42 of the bearing housing 41 and thus be part of this structural unit. A spacer bushing 52 is expediently arranged between the eccentric disks 39 and 51 to ensure the desired distance. The eccentric disc 51 is also expediently designed for self-locking. Another possibility for venting the plate clamping spring 45 in the area opposite the tensioning flap 4 would also result, for example, from the fact that a corresponding finger 49 engages in a corresponding fork of the tensioning flap 4 and would thus forcibly be pivoted with it.

The two eccentric disks 39 and 51 can expediently be provided with one each of the facing, radially extending grooves 53 and 54 for connecting a turning tool. A corresponding turning tool 55, as can best be seen from FIG. 4, which has an approximately T-shaped cross section, can be easily brought into engagement with the desired eccentric disk through the pit opening 37, with a corresponding stud 56 in the Grooves 53 and 54 engages and the back 57 is guided with play on the opposite eccentric disc. This ensures that only one eccentric disc is actuated at a time and, on the other hand, both Ex-45 centering discs 39 and 51 can be actuated with one and the same turning tool.

Although some particularly preferred exemplary embodiments of the invention have been explained in more detail above, this is not intended to imply any limitation.

for example to form the actuating device, an eccentric pin can also be provided which engages in a wedge which is supported on the adjacent pit wall, the wedge being slidably mounted in the foot 5 of the tensioning flap 4. Such training is shown in CH-PS 609 914, Fig. 1, 55.

4 sheets of drawings