CA2476441A1

CA2476441A1 - Plate handling system

Info

Publication number: CA2476441A1
Application number: CA002476441A
Authority: CA
Inventors: Michael Graf; Peter Berner
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-02-16
Filing date: 2002-02-16
Publication date: 2003-08-21
Also published as: WO2003069888A1; AU2002244721A1; EP1360831A1; CN100391220C; CZ2004895A3; CN1623321A

Abstract

The aim of the invention is to create a device which enables rational provision of printing plates of various types and sizes for the most differe nt types of printing plate scanners, in spite of having means which are as few as constructively possible. To this end, a device is provided for loading and/or unloading printing plates into and out of a scanner, especially a drum scanner, said device comprising suction means which are used to receive printing plates, especially thermoprinting plates, and are provided with at least one suction plate and at least two suction heads connected to a vacuum system. The suction plate is embodied as a segment of a cylinder and can be deformed at least in terms of the surface form thereof.

Description

~O 03/06988$ - 1 - PCT/EP02/01671 Plate handliag s~rste~e The invention relates to an apparatus for loading and/or unloading an exposer (output scanner, output recorder), in particular a drum exposer, with printing plates, comprising a suction means. The invention also relates to a process based on this apparatus.
Books, newspapers, brochures or other products to be printed are produced by means of different printing processes. The production of such printed products can be carried out, firstly, by conventional printing processes, such as planographic, relief, gravure or screen printing and, secondly, by digital processes, such as the computer-to-plate (CTP) technique. rn the case of offset printing, the printed products are produced by using printing forms. In this case, the image or the text to be printed is transferred to printing form blanks - also called printing plates. Tn this case, a light-sensitive layer applied to a metal or plastic plate, based on silver or made of a photopolymer, is exposed by mearxs of W radiation. In addition, in particular in the area of the CTP
technique, thermal plates are also used, on which an image can be set by the action of specific temperatures. Lasers are suitable both for exposing photosensitive plates and for setting images thermally.
The size of the printing plate to be produced depends on the object to be printed. For all the processes in printing technology, an extremely wide range of plate formats belong to the prior art. In the area of the GTP
technique, a series of systems for setting images on printing plates with an extremely wide range of formats have been known for a long time, such as the "Laserstepperp from Misomex, the Laserstar from ~Cx~ause or "xpose!" from the Lizscher company.
In printing technology, time is a key component.
Automation of the production of painting plates is - ~ w therefore a logical consequence, This is because fully automatic printing plate production as one operation in the entire printing process accelerates the throughput and increases the productivity of a print shop.
DE-A 40 38 544 describes an apparatus fox producing printing plates. Tn this case, the plate blanks are arranged in stacks on stack carriers inside a magazine.
This magazine contains a circulating conveyor constructed as a paternoster and driven, having a plurality of stack carriers arranged one behind another. The stack carriers can be removed from the magazine in the horizontal direction by means of a displacement device and can be conveyed onto the copying table by a holding or feeding apparatus. This feeding apparatus comprises a suction frame with suckers. The suction frame can be moved in the horizontal and vertical plane and can transfer a plate blank to a copying table. The disadvantage with this 0 apparatus is, in particular, the complicated elevator mechanism within the magazine.
The apparatus described in DE-C1 41 05 269 for loading and unloading printing plates is less complicated than the apparatus described previously. Here, the plate blanks, likewise mounted in cassettes, are stacked in the manner of a tower as a magazine. The individual plate blanks can be transferred from a desired cassette to the copying table by means of a feeding apparatus.
For this purpose, the cassettes can be moved in the horizontal plane out of the magazine, so that the feeding apparatus can have access to the individual plate blanks. Not every cassette can be moved individually out of the tower; instead in each case the part of the tower is moved out, so that the desired cassette with the printing plates is arranged at the top. The feeding apparatus in turn comprises a rotary star, to whose projecting pivoting arms suction heads are fixed.

-The disadvantage with the apparatuses described in DE-A-44 38 544 and DE-A-41 05 269 is that they are not capable of loading cylindrical drum exposers.
EP-A-0 822 453 describes an apparatus and a method for picking up and transporting printing plates into an automated exposure dev~.Ge. A large number of printing plates is stored in the farm of stacks in cassettes or magazines. Here, different magazines can contain, different plate formats. The plate removal described in the application is carried out by a feeding apparatus.
Far this purpose, the desired plate formats are arranged by means of a complex elevator mechanism such ~.5 that they can be reached by the feeding apparatus. The feeding apparatus comprises a horizontally arranged and horizontally displaceable plate with suction heads, by means of which heads the plate on which an image is to be set can be picked up by vacuum. The disadvantage with this apparatus is, in particular, the complicated elevator mechanism. In addition, this application dace not prbvide any solution as to how the planar printing plate can ultimately be put into the cylindrical drum exposure by the feeding apparatus, on which it is arranged by means of vacuum, as described..
An apparatus fdr loading drum exposers is disclosed by EP-A-d 887 181. 2n this case, a printing plate which is arranged in a planar fashion by means of vacuum on a feeding apparatus ~.s inserted into a cylindrical drum exposex with the aid of a loading devise. The printing plate is transferred from the feeding apparatus to the leading device via rotating rolls. The 7.oading apparatus in turn moves over rails along the inner surface of the drum exposer, carrying the printing plate with it . The same loading device can move in the opposite direction and, aS a result, can transfer a printing plate on which an image has already been set out of the dxum expvser to a developing machine arranged downsstream. The disadvantage with this device is its complexity. Firstly, there must be a roll system to remove the printing plate ~rom the feed~.ng apparatus and, secondly, specific rail systems have to be arranged on a drum exposer so that the loading device can move along the internal drum. In addition, this apparatus is suitable only far loading internal drum exposers.
7.0 The prior art likewise includes e.pparatuses for printing plate loading and unloading which can be obtained on the market, such as the plate loading system (PHS) relating to the °xpose!° CTP exposer from the Luscher company. In this apparatus, the printing plates are stored in a planar fashion and in stacks in cassettes. These cassettes are arranged on one another and can be moved out of the front side in the horizontal direction. The feeding apparatus comprises a cylinder and a device for positioning the cylinder. The cylinder is mounted on the positioning device such that it can be rotated with respect to its longitudinal axis. Arranged an the cylinder are suction heads which are connected to a vacuum system. 8y means of the positioning device, the cylinder can be moved both in the vertical and iz~ the horizontal direction. In order to pick up a printing plate, a cassette is pushed horizontally out of the cassette stack and the cylinder is lowered vert~.cally onto the printing plate until the suction heads make contact with the printing plate. The cylinder is rotated over the printing plate by means of a horizontal movement o~ the positioning device with the vacuum switched on, as a result of which the topmost printing plate of a cassette is firmly held on the outside of the cylinder as the cyliz~der rotates. By means of the vertical drive of the positioning device, the cylinder is drawn upward, together with the printing plate. The cylinder with the printing plate which has laeen picked up is then moved aver the drum of the exposer by means of a horizontal displacement by -the positioning device. Using the vertical drive of the positioning device, the cylinder with, the printing plate is positioned on the inside of the drum, and the printing plate ~.s inserted into the drum by switching off the vacuum. 2n order to remove the printing plate on v~rhieh an image has beer, set, the same sequence of movements is carried out ~.n the opposite order, with the difference that the printing plate is not put back again into the cassette from which it was removed but is placed in or on a carrier, which. can be arranged instead of a cassette. This carrier is then connected to a develop~,ng device. The apparatus described is also capable of removing intermediate p~.pers, which are located between the individual printing plates in order 1.5 to protect the side on which an image is to be set, by means of the same mechanism described above. This can be done, for example, while a printing plate is having an image set on it. The disadvantage with this apparatus is its complexity. Firstly, a cylinder that can be rotated around its axis and has suction heads is needed. Secondly, a device which. can be moved both in the vertical and in the horizontal direction i.s needed to position Ghe cylinder. In addition, the size of the apparatus is disadvantageous.
The object of the present invention is, therefore, to provide an apparatus which, in spite of the lowest possible expenditure on construction, permits the logical provisioning of printing plates of different 3o types and sizes far an extremely wide range of types of printing plate expasers. In particular, this apparatus is intended likewise to be suitable for loading and unloading drum exposers with printing plates, independently of the size of the opening of the drum.
Additionally, the apparatus is to be cost-effective and space ~- saving .
A further abject of the present invention is to provide a method with which exposers, in particular drum exposers, can be loaded efficiently with printing plates and unleaded.
The object is achieved by an apparatus as claimed in Glaim 1, which is characterized in that the sucker plate is co~.structed in the form of a cylindrical segment and the sucker plats is designed such that it can be deformed at least in relation tc its surface farm.
These measures advantageously permit the use of the apparatus according to the invention for loading and unloading exposers with printing plates, in particular the loading and unloading of dr~~m exposers having a very wide range of drum aperture siz~a with printing plates of various sizes.
The auction means according to the invention comprises a sucker plate and suction heads. In this conr~.ec~ion, a plate is to be understood not to mean a flat, planar surface, but rather the plate has the shape of a cylindrical segment. The sucker plate is designed in this case such that it can be deformed in relation to its surface farm. According to the invention, the sucker plate is fixed by webs to an upper axle of the apparatus, it being possible for the angle or the distance between the webs to be varied.
In one embodiment of the invention, the sucker plate can be deformed by means of spindles with a spindle drive, and tha webs can be constructed ae pneumatic cylinders. rn a development of the invention, the sides of the sucker plate, which are arranged para~.lel to the axis of the cylindrical segment, can be deformed more easily with xespect to the surface form than the center of the sucker plate.

A further embodiment of the invention provides a sucker plate which can be pivoted around an axle, the axle being arranged substantially parallel to the axis of the cylindrical segment. According to the invention, the suction means substantially maintains its axial alignment when pivoted. In this case, the sucker platE
is aligned axially by the force of gravity.
By means of the pivoting movement, the pink-up 20 apparatus can reach different heights. In the case of an apparatus which also has a p7.ate magazine, therefore, it ~-a possible to dispense with a complicated elevator mechanism which brings the cassettes or printing plates into a position accessible to the pick-up apparatus. Aooording to the invention, simple drawer systems are used, in which the printing plates are stacked. The pick-up device is constructed according to the invention in such a way that, by means of the arcuate pivoting movement of the suction means, all the drawers,of a plate magazine can be reached. Use is preferably made of such drawers which pexmit the printing plates to be stored without the influence of light.
In an advantageous refinement of the invention, the base plate or an insert at the bottom of a drawer can be curved aonvexly. A printix~g plate stack which is stored in a drawer consequently likewise has such a curvature.
A further advantageous measure oan consist in both the opening and closing of the drawers of the plate magaaine, and the movement of the suct~.on means, being able to take place fully automatically and under software control.
In a development of the invention, two pick-up apparatuses according to the invent ion can load a drum exposer, it being possible for one apparatus to be used for the removal of the printing plate from the plate magazine and the subsequent transfer of the printing plate into an exposer and fox the removal of an intermediate paper, and the other apparatus can be used for the removal of the printing plate on which an image has been set from the exposer and the transfer of said printing plate to a developing apparatus.
The apparatus according to the invention can in principle be used irrespective of the type of plate magazine, the printing plate format and the type of the exposing device. The apparatus according to the invention can be used for any of the printing processes described at the start.
Further advantageous details of the invention are presented in the dependent claims, of which individual claims in turn have their own inventive contribution beyond the basic invention described here.
The invention will be explained in more detail using the exemplary embodiments illustrated schematically in the figures, in which:
Fig. 1 shows a schematic illustration of an apparatus according to the invention, Fig. 2 shows a schematic illustration of an apparatus having two pick-up apparatuses according to the invention, Fig. 3 shawl a perspective illustration of a pick-up apparatus according to the invention, Fig. 4 shaves a cross section through a schematically illustrated, deformable sucker plate according to the present invention, Fig. 5 shows a arose section of a schematically illustrated, further embodiment of a deformable sucker plate according to the present invention and Fig. 6 shows a plan. view of ~. deformable sucker plate according to the present invention.
Fig. 1 shows a schematic illustration of the apparatus according to the invention.. The apparatus comprises a plate magaaine 1, a pick-up apparatus 2 and an exposer 3. The pick-up apparatus 2 according to the invention is depicted without covering and in detail in Fig. 3.
The plate magazine 1 comprises a housing 4 having a plurality of drawers 5, 6. The bottom plate of a drawer 5 is of a4nvexly curved design. Printing plates 7, illustrated hatched here, of an extremely wade range of types and of different formats can lays placed in the manner of ~. stack in a drawer 5. The use of plate magaz~,nes in which the printing plates are Stored in planar fashion is likewise possible. In, the present embodiment, the drawers 5 axe equipped with plate stacks, including the intermediate papers located as a protection between they individual plates. In each case one plate format is stored in a drawer 5, the side of the painting plate 7 on which. an image is to be set being oriented upward. Up to 100 plates can be stacked per drawer 5. In the process, the printing plates 7 match the curvature of the drawer 5. The drawers 5 can be arranged to be extended by an electric motor. A
detection device, not illustrated here, such as an optical sensor, for example, which is arranged in or on a drawer can detect the lack of one or more printing plates 7 in a drawer 5.
4n the front side of the plate magazine 1 there ig a trough 8 having a stack holder 9 to hold the intermediate papers removed from the plate stack.

- 1.~ -The pink-up apparatus 2 comprises a sucker plate 10 with suction heads 11, which are fitted to arms 13 via webs 12. By means of the pivoting movement of the arms 13, a printing plate '~ can be removed from the drawer 5 and inserted into a drum exposer 3. For the purpose of removal, the sucker plate 10 is lowered onto the printing plate 7 until the suction heads 1~. of the sucker plate 10 can make contact with the printing plate 7. The printing plate 7 can be held firmly on the sucker plate 10 by vacuum. As an alternatW'e to this, it is also possible to use a, horizontally and vertically displaceable pick-up apparatus.
Irrespective of the design. of the pick-up apparatus 2, the sucker plate 10 is placed onto the printing plate ?
in such a w~.y that the surface form of the sucker plate 10 is changed, as illustrated in Figs. 4 and 5. This shape change of the sucker plate 10 has the effect that auction heads 11 which are arranged closer t4 the sides of the sucker plate 10 can make contact with the printing plate ?. Contact with the suction heads 1I is made with that side of the printing plate 7 on which an image is to be set. The suction heads il are put in place in such a way that their lateral movement on the printing plate surface is kept as small as possible.
The suction heads 11 are therefore designed in such a way that injury to or destruction of this side is nat possible. For example, the suction heads 11 are fabricated from resilient, soft plastic material. The deformability of the sucker plate l0 makes it possible that printing plates ? of a very wide range of s~.zes can be picked up and deposited by the sucker plate 10.
In this case, picking up a specific plate type can be controlled by applying the vacuum selectively to specific suction heads ~.1.
A print~.ng plate 7, once picked up, is inserted into the semicircular drum exposer 3 by means of a pivoting movement of the arms l,~ . The form of the sucker plate l0 with the printing plate 7 fixed to it is matched in this case to the size of the opening in the exposer 3.
Exact positioning of the printing plate 7 in the 1.0 expc~ser 3, not illustrated here, can be carried out eithar via a punched-out portion of th~ printing plate 7, which can be insexted ~.n exact register in pins arranged on the exposer 3, or the position of the printing plate 7 can be registered digitally.
While the laser of the exposer 3 is setting an image on the printing plate 7, the pick-up apparatus 2 is able to remove an intermediate paper which ie located between the individual plates 7 for the purpose o~
protecting stacked printing plates 7. After a printing plate 7 has been removed from a plate stack, such an intermediate paper is at the top in a drawer 5. The removal of this sheet is done with the same mechanism as the picking up of a printing plate 7, that is to say via the sucker plate l0 and the vacuum system which can b~ applied. In order that an intermediate paper is not picked up togethex with a printing plate, different sizes of suction heads 21 are arranged on the sucker plate 10. An intermediate paper is in this case picked up by means of a vacuum system which is appli$d to smaller suction heads. once the intermediate paper has been picked up, the drawer 5 moves back into the plate magazine 3. As a result of canceling the vacuum, the sheet falls into the stack container 9 in front of the plate magazine 1.
The presence or absence of a printing plate 7 or of an intermediate paper can be established by a sensor mechanism which is not illustrated here but which can be arranged on the sucker plate 10. For example, an inductive detector can report whether metal or nonmetal is resting on the sucker plate 10.
After an image has been set on the printing plate 7 and the intermediate paper has been removed, the printing plate 7 is transferred onto the conveyor belts of the planar drawer G by means of the pick-up apparatus 2.
Via the conveyor belts, not illustrated here, of the drawer 6, the plate is output to the output ramp 14 and can subsequently be fed to a developing device, not illustrated here. The output ramp ~.~ can also be arranged at the rear of the plate magazine.
Both the construction of the exposer 3 and that of the dQVeloping device are known per se and therefore do not require any spec~.fic explanation in the present connection.
For the further time optimization of the printing plate production, two of the pick-up apparatuses 2 according to the invention can be arr~.nged on an exposer 3. A
schematic illustration of such an apparatus is shown xn Fig. 2. In this case, one pick-up apparatus 2 loads the drum exposer 3 with printing plates 7 a~c~.d removes the intermediate papers. This pick-up apparatus is therefore arranged to a plate magazine 1. The other pick-up dev~.ae 2 remo~res the printing plates 7 on which images have been set from the drum exposer 3 and passes these on via an output ramp ~.4 to a developer, not illustrated here.
~'he pick-up apparatus 2 ~.s illustrated schematically ~.n Fig. 3. It comprises a frame 15 having a bottom part 16 and two side parts 17. The side parts 17 are connected at their upper end to a rotatable, lower axle or shaft 19 driven by a motor 18. The drive: shaft of the motor 18 goes onto a pinion 2p. The p~.nion 20 is operatively connected via a first tooth belt 21 to a belt pulley 22. The be~.t pulley 22 is firmly seated on tk~e shaft 29 so as to rotate with it. The latter is connected at both ends to an arm 13 in each case. Here, the end of the arms 13 ~.rranged at the shaft 19 is of cux~red or disk-like design. The arms 13 are synchronized via the shaft 19 and execute parallel pivoting movements. At the other end of the arms 13, a sucker plate 10 is rotatably arranged via a mounting comprising an upper axle 23 and webs 12. The sucker plate 10 is constructed in the form of a cylindrical segment. The upper axle 23 of the sucker plate l0 is ~.rranged substantially parallel to the shaft 19. The sucker plate 10 arranged such that it can be pivoted around the upper axle 23. When pivoted, the sucker plate 1p maintains the axial alignment, the sucker plate 10 being aligned on the basis of the force of gravity. The upper axle 23 is operatively connected to the shaft 19 via a furthex toothed belt 2~. As a result of the drive, the suckex plate 10 executes a controllable pivoting movement.
The sucker plate l0 comprises at lea$t two suction heads 11. Illustrated here are a plurality of suction heads 11, which are fitted in rows in or on the sucker plate 10, parallel to the upper axle 23. It is possible for suction heads 11 of different sizes to be arranged on the sucker plate 10. Another arrangement of the suction heads ~.~. is likewise possible. The suction heads 11 are eanrlected to a controllable vacuum system, not illustrated here. The sucker plate 10 is constructed such that it can be deformed in relation to its surface form. Various embodiments of the sucker plate ~.0 are illustrated ire. Figs 4 and 5.
The dr~.ve motor 18 is assisted by a counterweight system 25. For this purpose, a rod a6 having a weight 27 is in each case fixed to the curved end of the arms 13. The weight 27 is guided on the frame 15 so that it can execute only vertical movements. To this end, in _ Zg each case a guide carriage is arranged on the weight 27 and a guide rail on the frame 15, neither of which is shown here. When the arms 13 are lowered, the weight 27 is pulled upward by the pivoting movement, and downward when the arms 30 are lowered. The torque acting around the axles 19 therefore retards the pivoting movement during lowering, while during raising it assists the torque of the motor foxae.
Figs 4 and 5 i~.lustrate schematicaJ.ly the cross sections of various embodiments of a suction means according to the invention having means for fixing to the upper axle 23. The fixing means in Fig. 4 comprises two pneumatic cylinders 28 and a spindle 29 with a spindle drive 30. Shown in Fig. 5 is a means for fixing the sucker plate 10 which, in each case, comprises two webs 12 and a connecting piece 31, the upper axle 23 and the arms 13, the latter not illustrated.
The webs 12 or the pneumatic cylinders 28 are rvtatably fitted to the sucker plate 10 and to the connecting piece 31 or to the sp~.ndle drive 30. By reducing the size of the angle between the webs 12 or the pneumatic cylinders 28, the sucker plate 10 can be deformed in relation to its surface form.
In this case, the angular change and therefore the form change of the sucker plate 10 can be controlled, as shown in Fig. 4, by a spindle dxive 30. As an alternative to this, the angular change can be induced Qn account of the force o~ gravity. If the sucker plate is guided upward from the drum e~cposer 3 or from a drawer 5, as illustrated in Fig. 5, then the angle between the webs la changes on account of the force of gravity which acts on the sucker plate 10.
An exemplary embodiment of a sucker plate 10 is shown in Fig. 6. At the sides, which are arranged parallel to the axis of the cylindrical segment, tha sucker plate has holes so that it can be deformed more easily in relation to its surface form at these sides than Ln the oenter.
5 z'he invention algid relates to a method for automatic printing plate loading and unloading. Fig. 1 illustrates an apparatus with which the method according to the invention rnay be carried out. A drawer 5 belonging to the plate magazine 1, cor~.taining a stack 10 of printing plates 7 of a specific format, is extended horizontally by a drive. The pick-up apparatus 2 ie then pivoted in the direction of the plate magazine 1 to such an extent that the sucker plate 10 can make contact with the printing plate 7. As a result of the pivoting movement being continued and as a xesult of the associated deformation of the sucker plate ~,0, all the suction heads 11 make contact with the printing plate 7. By applying vacuum to the suction heads 11, the printing plate 7 is held on the sucker plate 10.
After a printing plate 7 has been picked up on the sucker plate 10, the latter is positioned into the drum of the exposer 3 by means of the pivoting movement of the arms 13, and is inserted into the drum as a result of the vacuum being switched off . As an alternative to this, the pivoting movement can be replaced by a hor~.zontal and vertical movement.
While the exposer 3 is setting an image on the printing plate 7, the intermediate paper is removed. For this purpose, the arms 13 pivot back from the exposer 3 toward the still-open drawer ~,of the plate magazine 1.
The sucker plate l0 is then lowered Qnto the intermediate paper which, following the removal of the printing plate 7, ~.e located at the tap in the drawer 5. The action of picking up the sheet is carried out via the same mechanism as that of a printing place 7.

In order to prevent a printing plate being picked up together with an intermediate paper, the vacuum system is applied selectively to the smaller suction heads 11.
zn addition, the presence of a printing plate 7 and/or a~ an intermediate paper on the sucker plate 10 can be detected via a sensor mechanism.
After the intermediate paper has been picked up by the sucker plate 10, the drawer 5 is moored back iz~.to the 20 plate magazine 1 again. As a result of the vacuum being switched off, the intermediate paper falls down, into the stack container 9 of the trough 8.
The pick-up apparatus 2 then pivots back to the drum exposer 3 again and picks up the printing plate 7 on which an image has been set, by applying the vacuum.
The arms 13 pivot back again toward the open drawer 6.
The drawer 6 is closed, and the printing plate 7 on wh~,ch an image has been set is transferred to the output ramp l~ by the conveyor belts of the drawer 6.
Finally, the printing plate 7 is fed to the developing device arranged downstream by means of the output ramp 14.
In a further embodiment of the method according to the invention, two pick.-up apparatuses 2 can be used fox loading and unloading an exposer 3 and far removing an intermediate paper. The first pick-up apparatus 2 removes the printing plate 7, loads the exposer 3 and removes th~ intermediate paper. All the method steps are carried out as described above. After an image has been set, the second pick-up apparatus 2 removes the printing plate 7 on which an image has been set and transfers it either directly to a developing device or to an interposed output ramp 14. While the second pick-up apparatus 2 is removing the printing plate 7, the first pick-up apparatus 2 caz~ already pick up a next printi~ig plate 7 and keep it ready to load the exposer 3.

_ 17 -hint of dssigaata.vas 1 Plate magaaine 2 Pick-up apparatus 3 Exposer, drum exposer 4 Housing 5 Drawer 6 Drawer with conveyor belt.

7 Painting plate 8 Trough 9 Stack container l0 5uekex plate 11 Suction head i2 web 13 Arm 14 Output ramp 15 Frame 16 Bottom part 17 Side part 18 ~Ivtor Zs shaft 24 Pinion 21 First toothed belt 22 Belt pulley ~3 Upper axle 24 Second toothed belt 25 Counterweight system 26 Rod 27 Weight 28 Pneumatic cylinder 29 Spindle 30 Spindle drive ~1 Connecting piece

Claims

claims

1. An apparatus for loading and/or unloading an exposer (3), in particular a drum exposer (3), having printing plates (7) with - a suction means (10, 11), comprising at least one sucker plate (10) and at least two suction heads (11) connected to a vacuum system, for picking up printing plates (7), in particular thermal printing plates, characterized in that - the sucker plate (10) is constructed in the form of a cylindrical segment and - the sucker plate (10) is designed such that it can be deformed at least in relation to its surface form.

2. The apparatus as claimed in claim 1, characterized in that the sucker plate (10) is fixed to a suspension means.

3. The apparatus as claimed in claim 2, characterized in that the suspension means comprises an upper axle (23) of the apparatus, the sucker plate (10) is fixed to the upper axle via webs (12), and in that the angle or the distance between two webs (12) can be varied.

4. The apparatus as claimed in claim 3, characterized in that the suspension means comprises a spindle (29) having a spindle drive (30) for deforming the sucker plate (10).

5. The apparatus as claimed in claim 3 or 4, characterized in that at least one of the webs (12) comprises a pneumatic cylinder (28).

6. The apparatus as claimed in one of claims 1 to 5, characterized in that two sides of the sucker plate (10) are arranged substantially parallel to the axis of the cylindrical segment and the sucker plate (10) can be deformed more easily with respect to the surface form at said sides than in the center.

7. The apparatus as claimed in one of claims 1 to 6, characterized in that the sucker plate (10) is aligned axially by the force of gravity.

8. The apparatus as claimed in one of claims 1 to 7, characterized by a pivoting device bar means of which the sucker plate (10) can be pivoted around an axis substantially parallel to the axis of the cylindrical segment.

9. The apparatus as claimed in claim 8, characterized in that the sucker plate (10) substantially maintains the axial alignment when pivoted.

10. The apparatus as claimed in claim 8 or 9, characterized in that the pivoting device comprises at least one arm (13) which is rotatably arranged on a shaft (19), and in that the sucker plate (10) can be pivoted around an axle (23) substantially parallel to the shaft (19).

11. The apparatus as claimed in claim 10, characterized in that the pivoting device comprises two arms (13) for carrying out parallel pivoting movements.

12. The apparatus as claimed in one of claims 8 to characterized in that the pivoting device is designed in such a way that it can execute a pivoting movement of 45° to 270°, preferably of 75° to 240°.

13. The apparatus as claimed in one of Claims 1 to 12, characterized in that the suction heads (11) of different sizes are arranged in or on the sucker plate (10).

14. The apparatus as claimed in one of claims 1 to 13, characterized in that the suction means (10, 11) is also designed to remove an intermediate paper.

15. The apparatus as claimed in one of claims 1 to 14, characterized by a drive means, preferably by a motor (18) assisted by a counterweight (25).

16. The apparatus as claimed in one of claims 1 to 15, characterized in that it, further comprises a plate magazine (1).

17. The apparatus as claimed in claim 16, characterized in that the plate magazine comprises extendable drawers (5, 6), in particular drawers (5) with a convexly curved bottom plate or a convexly curved insert at their bottom.

18. The apparatus as claimed in claim 16 or 17, characterized in that printing plates (7) of different format can be stacked in the drawers (5).

19. The apparatus as claimed in one of claims 16 to 18, characterized in that a drawer (6) has at last one conveying means for moving a printing plate, in particular a conveyor belt.

20. The apparatus as claimed in one of claims 16 to 19, characterized in that the drawers (5, 6) can be extended in the horizontal plane by a drive.

21. The apparatus as claimed in one of claims 16 to 20, characterized by a detection means for detecting the lack of at least one printing plate (7) in a drawer, the detection means being arranged in or on a drawer (5).

22. The apparatus as claimed in claim 21, characterized in that the detection means comprises an optical sensor.

23. The apparatus as claimed in one of claims 15 to 22, characterized in that the drawers (5) are optically opaque when in the closed state.

24. A method of loading and/or unloading an exposer (3), in particular a drum exposer (3), with printing plates (7) by means of an apparatus which comprises a suction means (10, 11) comprising at least one sucker plate (20) and at least two suction heads (11) connected to a vacuum system to pick up printing plates (7), in particular thermal printing plates, having one or more of the steps in which - a printing plate (7) is picked up by the suction means (10, 11), - is inserted into an exposer (3), - is removed from the exposer (3) and - is transferred to an output ramp (14), and - an intermediate paper is removed characterized in that - the sucker plate (10) is constructed in the form of a cylindrical segment and - the sucker plate (10) is changed at least in relation to its surface form.

25. The method as claimed in claim 24, characterized in that the suction means (10, 11) is fastened to arms and, by means of a pivoting movement of the arms (13) and the suction means (10, 11) fastened to them, a printing plate (7) is picked up, inserted into the exposer (3), transported from the exposer (3) to the output ramp (14) and/or an intermediate paper is removed.

26. The method as claimed in either of claims 24 and 25, characterized in that the sucker plate (10) substantially maintains the axial alignment when pivoted, the sucker plate (10) being aligned axially by the force of gravity.

27. The method as claimed in any of claims 24 to 26, characterized in that the sucker plate (10) is pivoted by means of a pivoting device around an axle substantially parallel to the axis of the cylindrical segment.

28. The method as claimed in one of claims 24 to 27, characterized in that the printing plates (7) are picked up from a drawer of a plate magazine (1).

29. The method as claimed in claim 28, characterized in that the printing plate can be picked up from extendable drawers (5, 6), in particular drawers (5) with a convexly curved bottom plate or a convexly curved insert at their bottom.

30. The method as claimed in claim 28 or 29, characterized in that printing plates (7) of different format are stacked in the drawers (5).

31. The method as claimed in one of Claims 28 to 30, characterized in that using a detection means to detect the lack of at least one printing plate (7) in a drawer (5), the lack of at least one printing plate (7) is detected, the detection means being arranged in or on a drawer (5).

32. The method as claimed in one of claims 24 to 34, characterized in that by means of a control system, both the opening of the drawers (5, 6), the transfer of the printing plate (7) from the plate magazine (1) to the exposer (3) and/or from the exposer (3) to the output ramp (14), and/or the removal of an intermediate paper proceeds in an automated manner.

33. The method as claimed in one of claims 24 to 32, characterized in that the loading of the exposer (3) and/or the removal of an intermediate paper is carried out by means of a first apparatus, which comprises a suction means (10, 11) comprising at least one sucker plate (10) and at least two suction heads (11) connected to a vacuum system fox picking up printing plates (7), and the unloading of the exposer is carried out by means of a second apparatus, which comprises a suction means (10, 11) comprising at least one sucker plate (10) in the form of a cylindrical segment and at least two suction heads (11) connected to a vacuum system for picking up printing plates the sucker plate (10) in at least one of the aforementioned apparatuses being constructed in the form of a cylindrical. segment, and being changed at least in relation its surface form.