EP0603245A1

EP0603245A1 - Process and device for carrying away printing plates from a printing machine.

Info

Publication number: EP0603245A1
Application number: EP92919010A
Authority: EP
Inventors: Hermann Beisel; Peter Theobald Blaser; Dieter Hauck; Rudolf Hutzenlaub; Helmut Friedrich Jaeger; Hans-Georg Jahn; Robert Mueller; Anton Rodi; Nikolaus Spiegel
Original assignee: Heidelberger Druckmaschinen AG
Current assignee: Heidelberger Druckmaschinen AG
Priority date: 1991-09-12
Filing date: 1992-09-07
Publication date: 1994-06-29
Anticipated expiration: 2012-09-07
Also published as: CN1029212C; HK12396A; ATE135970T1; EP0603261A1; JPH07500294A; US5495805A; WO1993004864A1; JPH07500295A; CA2118583A1; CN1030048C; DE59202416D1; JP2669934B2; DE4130359A1; ATE123255T1; JP2760898B2; EP0603246A1; US5537926A; CN1071369A; ATE122965T1; DE4130359C2

Abstract

PCT No. PCT/EP92/02056 Sec. 371 Date May 12, 1994 Sec. 102(e) Date May 12, 1994 PCT Filed Sep. 7, 1992 PCT Pub. No. WO93/04863 PCT Pub. Date Mar. 18, 1993.A device in the form a magazine is disclosed for carrying away used printing plates from the plate cylinder of a printing machine. The device applies in particular to the automatic exchange of printing plates. The device has an arrangement for carrying away the plates with (first) holders for each printing plate capable of being activated. The (first) holders are arranged on a (first) carriage that can be moved along a (first) guide substantially over the whole length of the device, inside the magazine.

Description

Device and method for removing printing plates from a printing press

The invention relates to a device designed as a magazine for removing (removing) printing plates from a printing plate cylinder of a printing press, in particular for an automatic or semi-automatic printing plate change _/ with a plate removal device which has activatable (first) holding means for the respective printing plate.

A device of the type mentioned is known from European patent application 0 435 410. It serves to automate a printing plate change. The magazine records old, used records. For removal, the printing plate used is unclamped at one end on the printing plate cylinder and then - by appropriate rotation of the printing plate cylinder - partially inserted into the magazine. The other end of the pressure plate is then removed from the clamping device

Printing plate cylinder released and the entire printing plate with the plate discharge device inserted into the magazine. Then a new printing plate to be used is then removed from the magazine by means of the plate feed device. First, one end of the printing plate is inserted into the corresponding clamping device of the printing plate cylinder and clamped there and then - by rotating the printing plate cylinder - the printing plate is completely pulled out of the magazine and around the outer surface of the printing plate cylinder. Then the other end of the pressure plate is clamped and there is a clamping in the circumferential direction. The lattenabführreinri device of the known device has movable suction cups by means of piston / cylinder unit. Since the cylinder of the piston / cylinder unit has a length corresponding to the piston rod and its If the length of the magazine adjoins the path of movement, a correspondingly long design of the magazine is required.

The invention has for its object to provide a device of the type mentioned, which allows the removal of printing plates with a simple structure and safe operation and small designs.

This object is achieved in that the (first) holding means are arranged on a first carriage which can be moved along a first guide approximately over the entire length of the device in the interior of the magazine. Because the first carriage can be moved approximately over the entire length of the device inside the magazine, old, used printing plates can be completely retracted into the magazine cassette in one operation. This would not be possible using a conventional piston / cylinder unit, since the latter itself has a certain length that is not available for the adjustment path.

The first holding means are preferably designed as activatable first suction elements.

It is particularly advantageous if the first carriage can be moved by means of a drive device having a magnetic coupling. The magnetic coupling is not a rigid but a flexible coupling and it is also possible to move the first carriage over the entire length of the device.

In particular, it is provided that the Antriebseinr device has a non-ferromagnetic tube that extends along the path of movement of the first carriage and that of a ferromagnetic component attached to the carriage, in particular Steel ring, is longitudinally enclosed and is arranged in the tube with a longitudinally movable magnetic piston from a pressure medium, which forms the magnetic coupling with the ferromagnetic component. So if the magnetic piston is moved in the desired manner in the tube by the pressure medium, the erromagneti see component and thus the first carriage is taken along its guide. The guide preferably consists of two spaced-apart guide parts, in particular guide rods. These preferably run parallel to one another. The two guides are arranged in the side areas of the magazine. The drive device is preferably located between the two guide parts.

Alternatively, however, it is also possible for one of the guide parts to be formed by the drive device. Accordingly, there is a corresponding guide rod on one side of the magazine and on the other side the tube provided with a magnetic piston, the ferromagnetic component, in particular the steel ring, being mounted on the tube longitudinally and thus a guide is also formed.

As already mentioned, the first holding means can be activated (this also applies to the second holding means mentioned later), that is, their function of holding or not holding the printing plates can be switched on and off. Furthermore, the activation also includes the possibility that the holding means can be displaced transversely to the plane of the printing plates in order to be able to step against the surface of the corresponding printing plate. As already mentioned, the holding means are preferably designed as suction members, that is to say they have suction cups which operate by means of a vacuum which can be switched on. In addition to the possibility of displacement in the direction transverse to the plane of the pressure plates with all holding means, at least one of the first holding means itself is also movably mounted on the first carriage transversely to the plane of the pressure plates. Consequently, the first holding means can not only be lengthened or shortened in the longitudinal direction in the direction of the adjacent pressure plate, but can also be shifted overall in this direction. This is done in an upper position of the carriage by means of a positive control such that the preferably angled printing plate trailing edge of the printing plate used passes under a holding edge of the cassette when it is inserted into the cassette. As soon as the back edge of a used printing plate is removed from the

The trailing edge clamping device of the printing plate cylinder has been released and the printing plates have been partially pushed into the interior of the magazine by rotating the printing plate cylinder backwards, the end of the printing plate is gripped by the first holding means. The car is in a lower position. For the introduction of the printing plate used into the interior of the magazine, the carriage is then moved into the above-mentioned position, the printing plate cylinder simultaneously making a reverse rotation and thus "unwinding" the printing plate from the outer surface of the printing plate cylinder. When the carriage is moved into the upper position, the positive control then comes into operation, which shifts the mentioned first holding means and thus the rear edge region of the printing plate in the direction of the cassette receiving the printing plate used, so that the printing plate with the angled trailing edge under the mentioned holding edge of the cassette.

The positive control is preferably formed by a run-up slope on which a scanning element for moving, in particular Swiveling, the movably mounted first holding means runs on.

If the rear edge of the printing plate has been moved into the position described, the front of the printing plate is acted upon by at least one hold-down device arranged in the lower region of the magazine and is thereby also pressed into the cassette. The hold-down device remains in this position, while the holding means push the printing plate down a little, so that the printing plate leading edge also comes under a holding edge of the cassette. The pressure plate to be removed is thus completely and securely accommodated in the cassette.

According to another development of the invention, it is provided that at least one guide roller for inserting the printing plate used into the cassette is arranged in the lower end of the magazine. This guide roller facilitates the feeding of the old, used printing plates into the magazine cassette.

The drawing illustrates the invention using an exemplary embodiment and shows:

1 is a printing unit of a printing press in a schematic representation with a magazine located in the starting position,

2 the magazine of FIG. 1 in a middle position,

Fig. 3, the magazine in plate change Iposi ti on the

Feeding a new printing plate to be used to the printing plate cylinder of the printing press, 4 shows a representation according to FIG. 3, but the printing plate is already clamped on the printing plate cylinder;

5 the return of the magazine to the starting position,

6 the approach to the middle position to accommodate a printing plate used,

7 shows the magazine in plate position when the printing plate used is received,

8 shows a representation corresponding to FIG. 7, but the printing plate is already completely in a cassette of the magazine,

9 the magazine in turn in the starting position,

10 shows a longitudinal section through the magazine,

11 shows a longitudinal section through the magazine according to FIG. 10, but in a different plane,

12 is a cross section through the magazine,

Fig. 13 is a schematic view in longitudinal section

Feeding a used printing plate to the magazine,

14 shows a representation corresponding to FIG. 13, but with the printing plate further inserted,

15 the magazine in longitudinal section with the pressure plate fully inserted, 16 shows a representation corresponding to FIG. 15, but in the state in which the front edge of the printing plate is inserted into a cassette of the magazine and

Fig. 17 shows a cross section through the magazine in the area of a plate removal device.

For an automatic or semi-automatic printing plate change, that is, for removing an old, used printing plate and then feeding a new, used printing plate to the printing plate cylinder 1 of a printing unit 2 of a printing machine 3, the printing unit 2 has a device designed as a magazine 4. With the magazine 4, which is provided in a printing machine 3 with a plurality of printing units 2 on each printing unit 2 of the printing machine 3, a newly used printing plate can also only be fed in or an already used printing plate can only be removed (FIGS. 1 to 9).

In Figure 1, the magazine 4 is in its starting position (vertical position). In this idle state, the magazine 4 is secured against tipping (locking). Normal machine operation (printing operation) is only possible in this lower, vertical position of magazine 4.

The magazine 4 has two receiving shafts 5 and 6, into each of which a cassette 7 or 8 can be inserted from above (FIG. 1). The cassette 7 is used to hold old printing plates already used in the printing press 3. The cassette 7 is designed such that it can accommodate several, for example five, used printing plates. These printing plates form a stack of printing plates in the interior of the cassette 7, that is to say the individual printing plates lie flat on one another. The cassette 8 is used to hold new printing plates that are still to be used. It can also have several, in particular five printing plates at the same time record, whereby these pressure plates are also assigned to each other *. To remove the printing plates used, it is therefore only required to pull the cassette 7 out of the receptacle 5. Outside the printing machine 3, the cassette 8 can be equipped with new printing plates that are still to be used. If this has taken place, the cassette 8 is inserted into the receiving shaft 6 of the magazine 4, so that it is available for feeding to the printing plate cylinder 1 of the corresponding printing unit 2.

The individual positions of the magazine 4 which are assumed for removing and / or feeding printing plates are explained below. If a printing plate 9 to be used is to be fed to the printing plate cylinder 1, the magazine 4 moves - according to FIG. 2 - vertically upwards into a central position and then swivels - according to FIG. 3 - into an inclined position (for example about 45 °). By means of a plate feeder of the magazine 4 to be explained in more detail, the printing plate 9 to be used is then fed to the printing plate cylinder 1 and clamped thereon (FIG. 4). The magazine 1 then pivots back into its vertical position and then lowers again into the lower position (starting position) according to FIG. 5.

The printing process can now be carried out. When the print job has been completed, the printing plate 9 must be removed from the printing plate cylinder 1. For this purpose, a lifting device in turn lifts the magazine 4 into the middle position (FIG. 6). This is followed - according to FIG. 7 - by pivoting into the inclined position and - by unclamping the rear edge of the plate and turning the printing plate cylinder 1 backwards - the printing plate 10 used is partially pushed into the magazine 4 (FIG. 7). According to Figure 8, the pressure plate 10 used is then completely by a plate removal device to be described in more detail below Magazine 4 completely pulled into the cassette 7. Now the magazine 4 pivots back into its vertical position and then lowers - according to FIG. 9 - into the starting position.

Of course, it is also possible to combine the removal and supply of printing plates in order to change the printing plates. This means that in the inclined position, a printing plate 10 used is first received by the magazine 4 and a new printing plate to be used is then fed to the printing plate cylinder 1. If this has taken place, the magazine 4 swings back into the vertical and lowers into the starting position.

The construction of the magazine 4 will be explained in more detail below with reference to FIGS. 10 to 12.

For technical reasons, the magazine 4 is shown in FIGS. 10 and 11 in a horizontal position relative to the side edges of the drawing sheet. However, it should be pointed out that the positions shown in FIGS. 10 and 11 correspond to the inclined positions according to FIGS. 3, 4, 7 and 8.

The magazine 4 is constructed schi-shaped. It has an outer layer 11 from which the cassette 7 is received. In a subsequent layer 12 one of the above cassette 7 assigned plate removal device 13 is accommodated. The cassette 8 is arranged in a subsequent layer 14. A further layer 15 takes a P pattenzuführeinri device 16, which cooperates with the pressure plates 9 of the cassette 8.

The plate removal device 13 has first holding means 17, which are embodied as activatable first suction elements 18. The suction cups 19 of the first suction members 18 can be extended in the direction of the pressure plates 10 (in FIGS. 10 and 11 are - for the sake of clarity - only one pressure plate 9 and 10 respectively shown). The first suction elements 18 are arranged on a first carriage 20 which can be moved along a first guide 21. According to FIG. 1, the guide 21 has two guide parts 22 which are spaced apart from one another and run parallel to one another and which are designed as guide rods 23. The . Guide rods 23 are surrounded by guide parts 24 of the first carriage 20 with a slight play.

The first carriage 20 can be moved along the first guide 21 by means of a drive device 25. The drive device 25 has a fixed, non-ferromagnetic tube 26 (for example an aluminum tube) which extends from the top to the bottom of the magazine 4. Inside the tube 26 there is a magnetic piston 27 which can be moved back and forth within the tube 26 by means of a pressure medium and can be positioned in the desired positions. A ferromagnetic component 28, which is designed as a steel ring 29, is located on the first carriage 20. Movement of the magnetic piston 27 therefore has the effect that the steel ring 29 and thus the carriage 20 are taken along via the magnetic field. Because of this construction, there is a flexible coupling and, moreover, the carriage can be moved from a position at the top in magazine 4 (shown with solid lines in FIG. 10) to a position at the very bottom (shown with dashed lines in FIG. 10).

According to FIG. 17, a suction element 18 is arranged on both sides of the drive device 25. Each suction element 18 is fastened to a lever 30 which can be pivoted in the direction of the pressure plate 10 by means of a hinge 31. The position of the levers 30 is determined by a positive control 32 (see also FIG. 13) which is formed by a roller 33 which is connected to each lever 30 and which in FIG a stationary guide rail 34 runs. Each guide rail 34 has in the upper region of the magazine 4 on a taper 35 (Figure 13), so that when moving to an upper position 20 the rollers 33 run onto the taper 35 and thereby the lever 30 and thus the suction members 18th pivot towards the pressure plate 10. Springs 115 are used to return the lever 30 and to rest the rollers 33 on the tapered surfaces 35.

In the lower area of the magazine 4, actuatable hold-down devices 36 are arranged on opposite sides, which serve to act upon the pressure plate 10 in this area. Furthermore, four guide rollers 37, 38 and 39 are arranged in the lower region of the magazine.

The function of removing a printing plate 10 from the printing plate cylinder 1 into the cassette 7 of the magazine 4 is described below. For this purpose, the magazine 4 is first brought into the required inclined position, corresponding to FIGS. 6 and 7. Then a trailing edge clamping device 40 of the printing plate cylinder 1 opens and releases the angled one clamped there

Printing plate trailing edge 41 free. As a result of the inherent elasticity, the rear end of the pressure plate 10 strikes against the guide roller 37 (FIG. 13). Then, by turning the printing plate cylinder 1 backwards (arrow 42), the printing plate 10 is inserted into the cassette 7 of the magazine 4. The guide rollers 37, 38 and 39 help in inserting the trailing edge end of the printing plate 10. Guide rails 116 can be arranged which are in cutouts in the Slide the pressure plate trailing edge 41. This insertion is shown in FIG. 13 with a dotted line and in FIG. 14 with an excellent line. If the pressure plate 10 has been moved approximately one third into the magazine 4, the suction elements 18 of the carriage 20 located in the lowest position within the magazine 4 are activated, which That is, the suction cups 19 move in the direction of the pressure plate 10 to be held and suck on the pressure plate 10. Now the carriage 20 moves while simultaneously turning the printing plate cylinder 1 backwards into its upper position, as a result of which the printing plate 10 is completely drawn into the magazine 4. Here, the front edge 44 of the pressure plate 10 is also unclamped. If the carriage 20 reaches the upper end region of the magazine s 4, the rollers 33 run onto the bevels 35 and pivot the levers 30, so that - according to FIG. 15 - the angled pressure plate rear edge 41 comes under a retaining edge 43 of the cassette 7. The hold-down devices 36 then press the pressure plate 10 down in the region of its front edge 44 (FIG. 16), so that the front edge 44 comes to lie lower than a holding edge 45 of the cassette 7. By gravity and / or by moving the carriage 20, the front edge 44 is then brought under the holding edge 45 by pulling down the pressure plate 10. The printing plate 10 is thus securely arranged in the cassette 7. In particular, if several printing plates 10 that have already been used are to be accommodated in the cassette 7, it is necessary in the case of the printing plates 10 that were introduced last to pull them down by means of the carriage 20 and to hold them down by the hold-down devices 36 so that they come under the holding edge 45, due to relatively large tensions at the beginning of the printing plate, gravity alone is no longer sufficient to move the printing plates 10 into this position.

The printing plates 10 used are removed from the magazine 4 in a simple manner by pulling the cassette 7 out of the associated receiving shaft 5.

A special feature of the cassette 8, which contains the new printing plates 9 that are still to be used, is already discussed here, although the removal of the printing plates 9 from the cassette 8 will be discussed later. Are located several printing plates 9 stacked one on top of the other within the cassette 8, it is possible when the uppermost printing plate 9 is removed that a vacuum is formed for the following printing plate 9. This can lead to two printing plates being accidentally removed at the same time because they "stick together". To prevent this, a special removal technique is carried out, which will be discussed in more detail below, and it is also possible to place spacers between the individual pressure plates 9, so that the formation of a vacuum is prevented. The spacers are preferably designed as plastic tongues. They can be clipped on preferably in a snap-fit seat in the edge areas. When loading a cassette 8, spacers are first clipped in before another printing plate 9 is placed on a printing plate 9 already in the cassette 8. The spacers are so flexible that they dodge when removing the underlying pressure plate.

If, after removal of a printing plate 10, a new printing plate 9 still to be used is to be clamped onto the printing plate cylinder 1, the magazine 4 remains in its inclined position and a new printing plate 9 is removed from the cassette 8. This is done by means of the plate feed device 16. In order to use the

P plate feed device 16 to feed the printing plate cylinder 1 a printing plate 9 from the cassette 8, the magazine 4 is - as already mentioned - in its inclined position, in which support rollers 52 are supported on the bearer rings 53 assigned to the printing plate cylinder 1. The plate feed device 16 has second holding means 55 on a second carriage 54, which are also designed as activatable suction members 56 (second suction members). The suction members are - according to FIGS. 10 and 12 - each four of them in a row spaced apart, three rows being formed on the second carriage 54. It can also be provided that the lower one, the printing plate cylinder 1 to equip the next upcoming row of suction organs 56 with four suction elements 56 and the remaining rows with three each. The suction members 56 arranged in the lower row assigned to the printing plate cylinder 1 are fastened to levers 57 which can be pivoted about axes 58. Pressure cylinders 59 are provided for actuating the levers 57; furthermore, the levers 57 are struck by a spring 60. A preferably optically operating sensor 61 is arranged in the upper region of the magazine 4 and monitors the position of the associated pressure plate 9, in particular its position of the rear edge 41. An activatable depressing device 62 for loading the pressure plates 9 is arranged between the upper and the middle row of suction elements. Furthermore, the magazine 4 has at its lower end a displaceable pressing element 63 which is designed as a pressure roller 64 which can be displaced radially to the printing plate cylinder 1.

The second carriage 54 is by means of a

Piston / cylinder unit 65 can be moved along a second guide 66 (FIG. 12). The second guide is formed by fixed profile rails 67, in which guide rollers 68 of the carriage 54 run.

For feeding a printing plate 9, the lowest suction members 56 assigned to the printing plate cylinder 1 can first come into operation, the levers 57 being in their undeflected position. Then the suction members 56 of the middle row of suckers and then the suction members 56 of the top row of suckers become active. Another order, for example first the middle suction cups and then the ones on the edge, is conceivable. By activating the suction element rows, which does not take place simultaneously, but is carried out one after the other, the new printing plate 9 lying on top is raised in such a way that there is no or only a very small amount to the additional printing plate 9 located below low vacuum forms. This ensures that only one pressure plate 9 is raised. Otherwise, the aforementioned spacers (plastic tongues) can be arranged between the individual pressure plates 9, which additionally counteracts the formation of a vacuum. If the pressure plate 9 is raised, the carriage 54 is moved in the direction of the piston / cylinder unit 65

Printing plate cylinder 1 pushed. The front edge 44 of the pressure plate 9 enters the front edge clamping device 69 of the pressure plate cylinder 1, which was previously positioned accordingly. In the ancestor of the carriage 54 described above, the angled pressure plate rear edge 41 slides under the sensor 61, which registers the correct transport of the pressure plate 9. During the transport of the carriage 54, a bypass is activated in the air supply to the suction devices of the suction members 56, since a strong suction air is only necessary for the suction of the pressure plate 9. After the carriage 54 has almost reached its outermost position facing the pressure plate cylinder 1, the suction devices of the bottom and middle rows of the suction members 56 are pressureless or only subjected to a weak vacuum; the pressure plate 9 is therefore only held by the top row of suction cups. The purpose of this is that the pressure plate 9 can align better. Then the front edge clamping device 69 is closed, so that the front edge 44 of the pressure plate 9 is firmly clamped. Then the Druckplattenz cylinder 1 rotates in the forward direction and pulls the pressure plate 9 onto its outer surface. Due to the bypass, the suction elements are only subjected to a slight negative pressure, so that they still hold the pressure plate, but this can be moved on the suction elements by rotating the plate cylinder. Before the two upper rows of suction cups pass through the pressure plate trailing edge, these are each depressurized and brackets 70 ensure that the angled trailing edge glides past the suction elements without collision. Due to their proximity to the printing plate cylinder 1 the pressure plate 9 is relatively rigid in the area of the lower row of suction elements 56, so that a lever 57, which is designed as a plate with a hinge and on which the entire row of suction devices is arranged, or a plurality of levers 57 in its in order to pass through the angled pressure plate rear edge 41 the position shown in Figure 10 can be pivoted by means of one or more cylinders 59 so that the pressure plate rear edge 41 can pass the row of suction cups properly. Then the pressure roller 64 is moved radially in the direction of the Druckplattenz cylinder 1, whereby the angled printing plate trailing edge 41 is pressed into the trailing edge clamping device 40 of the printing plate cylinder 1. The trailing edge clamping device 40 closes and then clamps the printing plate by appropriate displacement in the initial direction of the printing plate cylinder 1. The carriage 54 then moves back to its original position in order to grasp the next printing plate 9 at the given time.

The device moves back to its original position by depressurizing the cylinders 59 so that the springs 60 can cause the lever (s) 57 to return to their original position. Then the depressing device 62 then comes into action, which ensures that the remaining printing plates 9 remain clean in the cassette 8 and cannot tip out, in particular when the magazine 4 is swiveled back into its vertical position.

FIG. 10 shows that elastic brackets 70 are associated with the upper and middle rows of the suction members 56. The elasticity of the brackets 70 allows the pressure plate 9 to be used to be sucked in, that is to say the brackets 70 do not interfere with this process. As soon as the suction elements 56 no longer have a vacuum and, in this respect, the pressure plate trailing edge 41 on the plate feeder Passes suction elements 56 past, the bracket 70 * ensure that the angled pressure plate rear edge 41 does not get caught on the suction cups of the suction elements 56.

Claims

Expectations

1. Designed as a magazine device for removing printing plates from a printing plate cylinder of a printing machine, in particular for an automatic printing plate change, with a plate removal device which has activatable (first) holding means for the respective printing plate, characterized in that the (first) holding means (17) a (first) carriage (20) is arranged, which can be moved along a (first) guide (21) approximately over the entire length of the device inside the magazine (4).

2. Device according to claim 1, d a d u r c h g e k e n n z e i c h n e that the first holding means (17) are designed as activatable first suction elements (18).

3. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the first carriage (20) by means of a magnetic coupling drive device (25) r is movable.

Device according to one of the preceding claims, characterized in that the drive device (25) has a non-ferromagnetic tube (26) which extends along the path of movement of the first carriage (20) and which is secured by a ferromagnetic component (20) attached to the carriage (20). 28), in particular a steel ring (29), is enclosed so as to be longitudinally displaceable, a magnetic medium which can be moved longitudinally by a pressure medium in the tube (26) Piston (27) is arranged, which forms the magnetic coupling with the ferromagnet i see component (28).

5. Device according to one of the preceding claims, that the guide (21) consists of two spaced-apart guide parts (22), in particular guide rods (23).

6. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that one of the guide point (22) is formed by the • drive device (25).

7. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that at least one of the first holding means (17) is movably mounted transversely to the plane of the pressure plates (9, 10) on the first carriage (20).

8. Device according to one of the preceding claims, characterized in that the movably mounted holding means (17) in an upper position of the carriage (20) by means of a positive control (32) is movable in the direction of the plane of the pressure plates (9, 10), that the preferably angled printing plate rear edge (41) of the printing plate (10) used, when introduced into the cassette (7), passes under a retaining edge (43) of the cassette (7).

Device according to one of the preceding claims, characterized in that the positive control (32) is formed by a run-on slope (35) onto which a scanning element (rollers 33) for moving, in particular for pivoting, the movably mounted first holding means ( 17) accumulates.

10. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that in the lower region of the magazine (4) at least one actuatable hold-down device (36) is arranged for loading the printing plates (10) used.

11. Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that at least one guide roller (37,38,39) for inserting the printing plates (10) used in the cassette (7) is arranged in the lower region of the magazine (4).