DE3812137A1 - DEVICE FOR FASTENING A FLEXIBLE PRINT PLATE - Google Patents

Abstract

A plate cylinder (1) for a rotary printing machine has an axially extending channel (5) in which a hollow cylindrical member (9) with a slot (7), which is parallel to the cylinder axis, and a shaft (6) are rotatably arranged co-axially. To ensure mutually independent clamping and tensioning of the end portions (2,3) of a printing plate (4), a second hollow cylindrical member (10), with a clamping strip (13) and a slot (8) which is parallel to the axis, is rotatably arranged co-axially on the other hollow member (9). A further clamping strip 11, which passes with rotary play through the slots (7,8) is connected with the shaft (6); another such strip (12), which passes with rotary play through the slot (8) of the outer hollow member (10), is connected with the inner hollow member (9). The shaft and hollow members are relatively rotatable so that leading end (2) of the plate is clamped to leading wall (14) of the channel by strip (11); trailing end (3) of the plate is clamped between strips (12,13); and strips (12,13) are then pivoted together to tension the plate. <IMAGE>

Description

Field of application of the invention

The invention relates to a device for fastening a flexible pressure plate on the plate cylinder a rotary printing press.

Characteristic of the known prior art

A solution is known (DE-PS 19 45 535) in which in an axially extending in the plate cylinder, the curved edges of both ends of the pressure plate receiving channel one with a recess for Insert the edges of the pressure plate Hollow shaft and a shaft rotatably arranged coaxially are. The shaft has a longitudinal groove into which the in Edge of rotation of the plate cylinder trailing edge the pressure plate with a rolled reinforcement is inserted while the leading edge of the Pressure plate in a recess open to the shaft Hollow shaft adjacent to the trailing edge of the Pressure plate is inserted. While the printing plate tensioned by turning the inner shaft the rotatable hollow shaft is used for relaxed Pressure plate for adjusting the circumferential register.

The disadvantage of this device is that the two Edges of the pressure plate should not be clamped separately can and thus in the arrangement of several Devices for multiple assignment of the plate cylinder with pressure plate in the circumferential direction when hanging up or Remove one printing plate from the edge of the other  adjoining pressure plate in the circumferential direction solved and partially postponed.

Another disadvantage is that the direction of rotation of the Plate cylinder trailing edge additionally rolled up and therefore executed relatively long must become.

Finally, the rotatability of the hollow shaft for the actual clamping or tension of the edges of the Pressure plate not effective, and the special arrangement the hollow shaft in the plate cylinder and its use as an adjustable contact edge for the in the direction of rotation leading edge of the printing plate leaves functional due to a more or less large conditional cavity on the circumference of the plate cylinder Doubts arise about the exact location of this edge.

When the shaft is turned, the trailing one becomes Edge of the pressure plate pulled into the channel, however, can due to design, no effective on this edge clamping force acting tangentially on the plate cylinder be exercised. However, this effect is special with high-speed rotary printing presses in mind a secure seat of the pressure plate on the Plate cylinder desirable by during the Machine run the rolling out of the pressure plate trailing edge of the pressure plate in connection with one endangering the strength of this edge Alternating bending stress is largely avoided.

Aim of the invention

The aim of the invention is to produce a simple and to create device to operate with equipped with a simple edge at both ends  Printing plates, especially in their multiple Arrangement in the circumferential direction of the plate cylinder, safe and rational on the latter regardless of its speed can be fixed.

State the nature of the invention

The invention has for its object a Device with at least one in the plate cylinder axially extending, the curved edges of both ends the pressure plate receiving channel, in which one with a plate width, axially parallel recess equipped hollow shaft and a shaft rotatable, are arranged coaxially so that both Edges of the printing plates clamped separately and in the direction of rotation of the plate cylinder trailing edge of the printing plate additionally in tangential direction can be tensioned. This is achieved by the invention on the hollow shaft a second, with a printing plate width, axially parallel recess and a bar Hollow shaft is rotatably arranged coaxially and with the Shaft a the recess of both hollow shafts as well with the inner hollow shaft the recess of outer hollow shaft penetrating under backlash, axially parallel bar is connected, each of which Strip leading in the direction of rotation of the plate cylinder as a terminal block against that on the adjacent side surface leading edge of the pressure plate, the trailing bar as a tensioning bar against the Inside as well as the middle bar as a clamping bar against the outside of the trailing edge of the Pressure plate is pivotable. The invention Device allows an independent one Clamping both edges and additionally a tension of the Edge trailing in the direction of rotation of the plate cylinder the pressure plate. This ensures a secure fit  Printing plates on the plate cylinder even at very high-speed rotary printing presses guaranteed. With multiple arrangement of printing plates in The edges of the circumferential direction of the plate cylinder one pressure plate without affecting the attachment the subsequent pressure plate clamped and tensioned as well as be solved. When removing a printing plate can between the middle terminal strip and tensioning strip pinched trailing edge of the pressure plate by a jointly pivoting these strips in the direction relaxed the trailing side surface of the channel and as a result the leading edge of the Pressure plate after releasing its clamp from the leading side surface of the channel can be lifted off. The pressure plate can then be rotated accordingly the plate cylinder without damaging the trailing edge of the printing plate from the plate cylinder can be removed, finally the clamping of the trailing edge of the pressure plate is released.

The device according to the invention stands out known comparable solutions by a small Space requirements, a low outlay for production and assembly of the individual parts, a high level of functional reliability and wear resistance and low maintenance effort out. Ultimately, the device allows Use of simple controls.

With regard to the arrangement of the two terminal strips and the clamping strip can be the device according to the invention vary in that the invention Terminal block for the in the direction of rotation of the plate cylinder leading edge of the pressure plate with the shaft that Clamping strip for trailing edge of the pressure plate with the inner hollow shaft and the tensioning strip with the outer hollow shaft or the terminal block for the in  Edge of rotation of the plate cylinder leading edge the pressure plate with the inner hollow shaft, the clamp bar for the trailing edge of the pressure plate the shaft and the tensioning bar with the outer hollow shaft or the terminal block for the in the direction of rotation Plate cylinder leading edge of the printing plate with the outer hollow shaft, the terminal block for the trailing edge of the pressure plate with the shaft and the tensioning bar with the inner hollow shaft or the Terminal block for the in the direction of rotation of the plate cylinder leading edge of the printing plate with the outer Hollow shaft, the terminal block for the trailing edge the pressure plate with the inner hollow shaft and the Tension bar is connected to the shaft. Are the individual arrangements functionally as equivalent to watch. While both terminal blocks both the shaft can also be assigned to both hollow shafts, can the middle terminal strip for the trailing Edge of the pressure plate only with the shaft or the inner Hollow shaft are connected.

A particularly favorable design of the invention Device is that according to the invention Terminal block for the in the direction of rotation of the plate cylinder trailing edge of the pressure plate on one side via compression springs against the terminal strip for the leading Edge of the pressure plate and with its other side in the unstressed, unclamped position of the trailing Edge of the pressure plate against a its distance to the trailing side surface of the channel fixing that Clamping bar in a stop penetrating a hole supports. This is to operate the terminal block none for the trailing edge of the printing plate separate controls are required. Besides, will in the axial direction by several compression springs uniform clamping force on the trailing edge of the Pressure plate exercised.  

The above-mentioned effect arises with a further reduced Space requirement also if the terminal block according to the invention for the trailing in the direction of rotation of the plate cylinder Edge of the pressure plate is designed as a leaf spring himself in the untensioned, unclamped position of this Edge cannot be swiveled, under tension against one their distance from the trailing side surface of the channel fixing the tension bar in a hole penetrating stop supports.

Finally, one cannot use separate controls equipped terminal strip for the trailing edge of the Pressure plate can be actuated functionally, by being on the one hand according to the invention Compression springs against the terminal block for the leading Edge of the pressure plate and opposite to it in the unstressed, unclamped position of the trailing Edge of the pressure plate over one with the inner hollow shaft firmly connected, the outer hollow shaft in a recess or with the shaft firmly connected the inner and the outer hollow shaft pivotable in a recess penetrating bolts with respect to their distance fixing the trailing side surface of the channel, in a cavity of the bridge of the plate cylinder arranged stop supports.

It is also possible, according to the invention, both Terminal strips as well as the clamping strip optionally as Form leaf spring. In addition to the small space requirement for the leaf springs, their elasticity can also be increased functionally advantageous - for example for one elastic retensioning of the trailing edge of the Pressure plate - can be used.

In the case of the solution variants with not separately operable  Clamping strip for the trailing edge of the pressure plate can depend on the connection of this terminal block with the inner hollow shaft or shaft according to the invention inner hollow shaft or the shaft axially in several separate segments can be divided. The gaps obtained through segmentation convenient for storing the with controls in Connected, continuous hollow shafts or Wave can be used. In addition, the Manufacturing effort for the device.

Embodiment

The invention is intended to be based on exemplary embodiments are explained in more detail. In the drawings shows

Fig. 1 shows a device according to the invention with a clamping of the leading end in the rotational direction of the plate cylinder edge of the printing plate of the plate cylinder and a clamping voltage and the trailing edge of the printing plate in cross section of a plate cylinder,

Fig. 2 variant of FIG. 1 with a mutual exchange of the respective compound of the terminal strips for the leading and trailing edge of the printing plate with the shaft or the inner hollow shaft,

Fig. 3 variant of FIG. 2 with a mutual exchange of the respective compound of the terminal strip for the leading and the clamping strip for the trailing edge of the printing plate with the outer or inner hollow shaft,

Fig. 4 variant of FIG. 3 with a mutual exchange of the respective compound of clamping and the clamping strip for the trailing edge of the printing plate with the shaft or the inner hollow shaft,

Fig. 5 variant of FIG. 1 with a resiliently supported, not separately actuatable clamping strip for the trailing edge of the printing plate,

Fig. 6 variant according to Fig. 5 trailing edge of the printing plate with dissolved,

Fig. 7 variant of FIG. 1 with a fixed inner hollow shaft and replacement of the terminal strip for the trailing edge of the printing plate by a leaf spring,

Fig. 8 variant of FIG. 5, with a modified stop for the terminal strip for the trailing edge of the printing plate

Fig. 9 variant of FIG. 1 with a replacement of the clamping strip and tensioning strip in each case by a leaf spring,

Fig. 10 a longitudinal section AA according to FIG. 5 with a segmental inner hollow shaft,

FIG. 11 representation according to FIG. 10 with a segmental shaft connected to the terminal strip for the trailing edge of the pressure plate.

Fig. 1 shows the cross section of a plate cylinder 1 having an axially extending, the curved edges 2; 3 has both ends of the pressure plates 4 receiving channel 5 , in which a shaft 6 and on this an inner and an outer each with an at least pressure plate-wide, axially parallel recess 7; 8 equipped hollow shaft 9; 10 is arranged. In an axially parallel slot of the shaft 6 is a screwed to the latter terminal block 11 for the leading in the direction of rotation of the plate cylinder 1 edge 2 of the pressure plate 4 and on the long side of the recess 7 of the inner hollow shaft 9 a welded to the latter terminal block 12 and on the long side of the recess 8 of the outer hollow shaft 10, a clamping bar 13 screwed to the latter for the trailing edge 3 of the pressure plate 4 is fastened.

The recesses 7; 8 of the inner and outer hollow shaft 9; 10 are radially at least so large that the terminal strips 11; 12 and the clamping bar 13 have the necessary backlash for the clamping process for the leading edge 2 and the clamping and clamping process for the trailing edge 3 of the pressure plate 4 .

For separate actuation of the terminal strips 11; 12 and the clamping bar 13 are the shaft 6 and the inner and outer hollow shaft 9; 10 on the front side of the plate cylinder with operating elements, not shown - for example with adjusting screws in combination with spring elements, adjusting levers limited in their movement by adjustable stops.

The leading edge 2 of the pressure plate 4 to be fastened on the plate cylinder 1 is inserted into the channel 5 and brought into abutment on its side surface 14 which is leading in the direction of rotation of the plate cylinder 1 and then clamped by pivoting the shaft 6 to the left with the terminal strip 11 . Then the pressure plate 4 is placed on its circumference with a corresponding rotation of the plate cylinder 1 and then its trailing edge 3 is radially inserted into the gap between the clamping bar 13 resting on the trailing side surface 15 of the channel 5 and the clamping bar 12 pivoted to the left and subsequently by a pivoting of the inner hollow shaft 9 with the clamping bar 12 clamped on its outside 16 while at the same time resting on the tensioning bar 13 inside 17 . Finally, the trailing edge 3 of the pressure plate 4 , which is clamped in this way, is pivoted jointly by pivoting the clamping strip 12 and the clamping strip 13 as a result of the outer and inner hollow shafts 10; 9 excited.

When removing the printing plate 4 , the trailing edge 3 of the printing plate 4 is first relaxed by reversing the processes described, so that after the leading edge 2 of the printing plate 4 has been unclamped, the latter can be subtracted from its circumference by rotating the plate cylinder 1 , and finally the trailing edge 3 of the pressure plate 4 can be removed from the channel 5 after the unclamping. This procedure guarantees damage-free removal of the printing plate 4 , since rolling or damage to the trailing edge 3 of the printing plate 4, which is initially still secured in the channel 5 , is prevented when the plate cylinder 1 is rotated.

If the plate cylinder 1 is occupied several times with pressure plates 4 in the circumferential direction, a plurality of devices according to the invention for fastening the pressure plates 4 must be provided accordingly. In this case 1, the leading edge 2 of the first pressure plate and the trailing edge 3 of the last plate in the circumferential direction of the plate cylinder 1 belonging in Fig.. The separately operable terminal strips 11; 12 and clamping bar 13 guarantee an independent fastening of all printing plates 4 in the circumferential direction of the plate cylinder 1 .

It is also possible with the devices according to the invention to separately fasten a plurality of printing plates that are wide on one side along the plate cylinder 1 , in that the control elements for the individual printing plates arranged inside and outside on the circumference of the plate cylinder 1 are arranged alternately on both end faces of the plate cylinder 1 .

A bridge 18 according to ( FIGS. 1 to 9), which is detachably inserted into the plate cylinder 1 by means of screws, simplifies the assembly and, in particular, the disassembly in the event of a repair of the device according to the invention.

The FIGS. 2 to 4 does not show up in terms of their function differing embodiments to Fig. 1. Here, in Fig. 2 deviating from Fig. 1, the terminal block 11 for the leading edge 3 of the pressure plate 4 with the internal tubular shaft 9 and the terminal block 12 for the trailing edge 3 of the pressure plate 4 with the shaft 6 , in FIG. 3 deviating from FIG. 2, the clamping strip 11 for the leading edge 2 of the pressure plate 4 with the outer hollow shaft 10 and the tensioning strip 13 for the trailing edge 3 of the pressure plate 4 connected to the inner hollow shaft 9 and in Fig. 4 deviating from Fig. 3, the terminal block 12 and the clamping bar 13 for the trailing edge 3 of the pressure plate 4 with the inner hollow shaft 9 or shaft 6 .

In FIG. 5, 1 the terminal block 12 of the pressure plate 4 of the plate cylinder 1, the pressure plate 4 is supported deviating from Fig. For the trailing edge 3 over a plurality of compression springs 19 lengthwise to the terminal block 11 for the leading edge 2 from. On the other hand the pivoting movement of the clamping strip 12 extending through the trailing edge 3 of the printing plate 4 by the clamping bar 13 in a bore 20, attached to the trailing end in the direction of rotation of the plate cylinder 1 side surface 15 of the channel 5 in the plate cylinder 1 stopper 21 is limited, so that when the tensioning bar 13 swivels back while the stop 21 emerging from its bore 20 there is an insertion gap for the trailing edge 3 of the pressure plate 4 ( FIG. 6).

The particular advantage of the embodiments according to FIGS. 5, 7 and 8 is that no control elements for the clamping bar 12 for the trailing edge 3 of the pressure plate 4 are required, and these terminal strip along the plate cylinder 1, a uniform clamping force on the trailing edge 3 of the printing plate 4 exercises.

Due to this fact, the inner hollow shaft 9 carrying the clamping strip 12 for the trailing edge 3 of the pressure plate 4 ( FIG. 10 according to section AA in FIG. 5) or, as a modification to FIG. 10, the shaft 6 ( FIG. 11) in individual segments 22; 23 are divided along the plate cylinder 1 .

The devices according to the invention according to FIGS. 2 to 4 can also be varied analogously to FIG. 5 with the same mode of operation.

Fig. 7 shows a variant of Fig. 1, in each of which the clamping strip designed as a leaf spring 24 for the trailing edge 3 of the pressure plate 4 carrying inner hollow shaft 9 is adjustable fixed with respect to the plate cylinder 1 , the leaf spring 24 correspondingly when the clamping strip 13 is pivoted back the clamping force to be exerted under prestress on the stop 21 . The operation of the device according to FIG. 7 corresponds to that of FIG. 5.

The devices according to the invention according to FIGS. 2, 3 and 4 can also be varied analogously to FIG. 7 with the same mode of operation, with the variants according to FIGS. 2 and 3 differing from FIG. 7 each having the shaft 6 carrying the leaf spring 24 relative to the plate cylinder 1 is fixed.

Fig. 8 shows a variant of Fig. 5, in which with the inner hollow shaft 9 , the outer hollow shaft 10 in a recess 25 pivotally penetrating bolt 26 is connected, which in the unclamped, untensioned state of the trailing edge 3 of the pressure plate 4 against supports a stop 28, which fixes the distance of the clamping strip 12 for the trailing edge 3 of the pressure plate 4 to the trailing side surface 15 of the channel 5 and is arranged in a cavity 27 of the bridge 18 of the plate cylinder 1 .

The devices according to the invention according to FIGS. 2, 3 and 4 can also be varied analogously to FIG. 8 with the same mode of operation, the bolts 26 being connected to the shaft 6 and for each of the variants according to FIGS. 2 and 3 deviating from FIG. 8 the latter both the inner and the outer hollow shaft 9; 10 is equipped with a recess.

Fig. 9 shows a variant of Fig. 1, in which both the terminal strips 11; 12 and the clamping bar 13 by a leaf spring 24; 29; 30 are replaced. In addition to the relatively small space requirement for the leaf springs, their elasticity can also be used for clamping both edges 2; 3 of the pressure plate 4 and in particular for the tension in the form of a tensioning effect for the trailing edge 3 can be used.

The device according to FIG. 9 can both according to FIGS. 2 to 4 and also in the sense of the optional replacement of one or both terminal strips 11; 12 or the clamping bar 13 by a leaf spring 24; 29; 30 can be varied.

Claims (12)

1. Device for fastening a flexible printing plate on the plate cylinder of a rotary printing press with at least one channel running axially in the plate cylinder and receiving the curved edges of both ends of the printing plate, in which a hollow shaft equipped with a printing plate-wide, axially parallel recess and a shaft are rotatably and coaxially arranged , characterized in that on the hollow shaft ( 9 ) a second hollow shaft ( 10 ) equipped with a pressure plate-wide, axially parallel recess ( 8 ) and a bar is rotatably arranged coaxially and with the shaft ( 6 ) one of the recesses ( 7; 8 ) of both Hollow shafts ( 9; 10 ) and to the inner hollow shaft ( 9 ) is connected an axially parallel strip which passes through the recess ( 8 ) of the outer hollow shaft ( 10 ) with torsional play, the strip leading in the direction of rotation of the plate cylinder ( 1 ) serving as a clamping strip ( 11 ) against the adjacent side surface ( 14 ) of the channel ( 5 ) adjacent, leading edge ( 2 ) of the pressure plate ( 4 ), the trailing bar as a clamping bar ( 13 ) against the inside ( 17 ) and the middle bar as a clamping bar ( 12 ) against the outside ( 16 ) of the trailing edge ( 3 ) the pressure plate ( 4 ) is pivotable. 2. Device according to claim 1, characterized in that the clamping strip ( 11 ) for the leading in the direction of rotation of the plate cylinder ( 1 ) leading edge ( 2 ) of the pressure plate ( 4 ) with the shaft ( 6 ), the clamping strip ( 12 ) for the trailing Edge ( 3 ) of the pressure plate ( 4 ) with the inner hollow shaft ( 9 ) and the clamping bar ( 13 ) with the outer hollow shaft ( 10 ) is connected. 3. Apparatus according to claim 1, characterized in that the clamping strip ( 11 ) for the leading in the direction of rotation of the plate cylinder ( 1 ) leading edge ( 2 ) of the pressure plate ( 4 ) with the inner hollow shaft ( 9 ), the clamping strip ( 12 ) for trailing edge ( 3 ) of the pressure plate ( 4 ) with the shaft ( 6 ) and the clamping bar ( 13 ) with the outer hollow shaft ( 10 ). 4. The device according to claim 1, characterized in that the clamping strip ( 11 ) for the leading in the direction of rotation of the plate cylinder ( 1 ) leading edge ( 2 ) of the pressure plate ( 4 ) with the outer hollow shaft ( 10 ), the clamping strip ( 12 ) for trailing edge ( 3 ) of the pressure plate ( 4 ) with the shaft ( 6 ) and the clamping bar ( 13 ) with the inner hollow shaft ( 9 ). 5. The device according to claim 1, characterized in that the clamping strip ( 11 ) for the leading in the direction of rotation of the plate cylinder ( 1 ) leading edge ( 2 ) of the pressure plate ( 4 ) with the outer hollow shaft ( 10 ), the clamping strip ( 12 ) for trailing edge ( 3 ) of the pressure plate ( 4 ) with the inner hollow shaft ( 9 ) and the clamping bar ( 13 ) with the shaft ( 6 ). 6. Device according to one of claims 2 to 5, characterized in that the terminal block ( 12 ) for the trailing in the direction of rotation of the plate cylinder ( 1 ) edge ( 3 ) of the pressure plate ( 4 ) on one side via compression springs ( 19 ) against the terminal block ( 11 ) for the leading edge ( 2 ) of the pressure plate ( 4 ) and with its other side in the untensioned, unclamped position of the trailing edge ( 3 ) of the pressure plate ( 4 ) against a distance from the trailing side surface ( 15 ) of the channel ( 5 ) which fixes the tensioning bar ( 13 ) in a bore ( 20 ) and supports the stop ( 21 ). 7. Device according to one of claims 2 to 5, characterized in that the terminal block ( 12 ) for the trailing in the direction of rotation of the plate cylinder ( 1 ) trailing edge ( 3 ) of the pressure plate ( 4 ) is designed as a leaf spring ( 24 ) in the untensioned, unclamped position of this edge ( 3 ) cannot be swiveled, pretensioned against a stop ( 21 ) which fixes its distance from the trailing side surface ( 15 ) of the channel ( 5 ) and penetrates the tensioning strip ( 13 ) in a bore ( 20 ) ) supports. 8. Apparatus according to claim 2 or 5, characterized in that the terminal block ( 12 ) for the trailing in the direction of rotation of the plate cylinder ( 1 ) edge ( 3 ) of the pressure plate ( 4 ) on one side via compression springs ( 19 ) against the terminal block for the leading edge ( 2 ) of the pressure plate ( 4 ) and opposite to it in the untensioned, unclamped position of the trailing edge ( 3 ) of the pressure plate ( 4 ) via a fixedly connected to the inner hollow shaft ( 9 ), the outer hollow shaft ( 10 ) in a recess ( 25 ) pivotably penetrating bolt ( 26 ) against a stop fixing their distance from the trailing side surface ( 15 ) of the channel ( 5 ), arranged in a cavity ( 27 ) of the bridge ( 18 ) of the plate cylinder ( 1 ) 28 ) supports. 9. Apparatus according to claim 3 or 4, characterized in that the terminal block ( 12 ) for the trailing in the direction of rotation of the plate cylinder ( 1 ) trailing edge ( 3 ) of the pressure plate ( 4 ) on one side via compression springs ( 19 ) against the terminal block for the leading edge ( 2 ) of the pressure plate ( 4 ) and opposite to it in the untensioned, unclamped position of the trailing edge ( 3 ) of the pressure plate ( 4 ) via an integral with the shaft ( 6 ), the inner and outer Hollow shaft ( 9; 10 ) in a recess pivotally penetrating bolt against a distance to the trailing side surface ( 15 ) of the channel ( 5 ) fixing, in a cavity ( 27 ) of the bridge ( 18 ) of the plate cylinder ( 1 ) arranged stop ( 28 ) supports. 10. Device according to one of claims 2 to 5, characterized in that the clamping strips ( 11; 12 ) and the clamping strip ( 13 ) are optionally designed as leaf springs ( 24; 29; 30 ). 11. The device according to claim 3 or 4 and 6, characterized in that the inner hollow shaft ( 9 ) is axially divided into several separate segments ( 22 ). 12. The device according to claim 2 or 5 and 6, characterized in that the shaft ( 6 ) is axially divided into several separate segments ( 23 ).