EP1155836B1 - Device for feeding a printing plate to the plate cylinder of a printing machine - Google Patents

Abstract

The printing machine (1) is associated with a number of interchangeable format inserts (9,9'') which can be inserted selectively into the printer and in which the plate cylinder (2,2') is mounted with a diameter corresponding to the selected format. The supply device (16) has a number of settings corresponding to the number of inserts so that the change position can be determined for the right insert. The printer has a sensor for detecting the relevant format insert and an operating member to automatically select the right setting in response to the detection signal of the sensor.

Description

The invention relates to a device for feeding a printing plate a plate cylinder of a printing press in a changing position in which an end edge the pressure plate can be transferred into a clamping device of the plate cylinder.

Such a known device (EP 0 714 771 A2) has one on the machine frame the linear drive for the printing press arranged in the vicinity of the plate cylinder Gripper devices that can be brought tangentially to the plate cylinder by the linear drive are. A swivel arm extends parallel to the axis of rotation of the plate cylinder Supported hanging bar on which is used to transfer the pressure plate The front end edge of the pressure plate to be clamped is hooked in. Then the hanging bar is pivoted towards the plate cylinder, whereby it gets into the path of movement of the gripper devices. The gripper devices take over the pressure plate and guide it with its angled front end edge up to an axial plate channel formed in the outer circumference of the plate cylinder the clamping device, whereby the pressure plate with its angled end edge in the plate channel can be clamped. Then the plate cylinder with the clamped front end edge of the pressure plate rotated thereon, whereby the Printing plate is wound on the plate cylinder until its also angled trailing end edge in either the same or a different plate channel of the plate cylinder intervenes and is also clamped there.

In another known device (EP 0 567 754 A1) are on one section of a foldable printing unit protection of the printing machine a roll and in the distance a suction cup is arranged. The pressure plate to be clamped is on the one hand on the Supported role and on the other hand held by the suction cup. In the folded up The position of the articulated printing unit protection is taken by the one carrying the roller and the suction cup Section a position with respect to the plate cylinder, in which the roller and Suction cup held pressure plate is aligned tangentially to the plate cylinder that it can be fed to its clamping device in the correct position.

It is also known (DE 195 08 844 A1) that the printing plate to be clamped in one To accommodate magazine that with transport devices for pushing out the printing plate Is provided. This magazine is on the press with respect to the plate cylinder arranged such that the printing plate pushed out by the transport devices with its front end edge to be clamped in a correct position for the clamping device of the plate cylinder is transferred.

All these known devices require that the change position in which the front end edge of the printing plate to be clamped into the clamping device of the plate cylinder is transferred, is clearly determined. They are therefore only for a single printing plate format designed. Plate cylinders for different printing plate formats, however, show different diameters with the result that the clamping devices of Plate cylinders of different diameters in the printing press are correspondingly different Take positions.

The invention has for its object a device of the aforementioned To create a type that allows operation with different formats.

According to the invention, this object is achieved in that the printing press has a number interchangeable format inserts are assigned, which are optionally in the printing press can be used and in which the plate cylinder with the selected format corresponding diameter is mounted, and that the feed device one of the number the format inserts have the corresponding number of settings, through which the for the appropriate change position is determined for the format insert used in each case.

The known format inserts are designed in such a way that they are independent of the format-dependent diameter of the plate cylinder in a designated holder fit the printing press and are driven by the latter. In the format inserts is in each case the plate cylinder, the rubber cylinder and if necessary, a counter-pressure cylinder in engagement with the rubber cylinder is stored. The The axes of rotation of these cylinders and their cylinder jackets have different sizes depending on the format Radii in the different format inserts in different positions. According to the invention, the feed device bears this through its different settings Invoice that has the right exchange position for each format insert result in the respective pressure plate to be clamped.

According to a particularly simple embodiment of the invention The device provides that a setting determining the setting is made on each format insert Positioning element for a mating element which can be brought into engagement with it End plate of the pressure plate aligning pressure plate guide element to be clamped is provided is. When changing the format, only the printing plate guide element has to be disengaged between its counter element and the positioning element of the one to be replaced Solved format inserts and after inserting the new format inset with it Positioning element are brought back into engagement. The printing plate guide element be suspended on a suitable support so that it can move freely Dead weight is essentially supported in this activity and also in the state in which it is not in engagement with the positioning element, within reach of the Printing press for handling is available.

While in the above embodiment the format insert by its positioning element the necessary position information for the relevant setting of the feed device provides, can be provided in an alternative embodiment that a on a stationary part receiving the format insert, in particular the printing press, supported and at a free end with a the end edge to be clamped Holding device connected to the printing plate aligning printing plate guide element, an adjusting device with a number of settings corresponding to the change positions for the free end. In this case, the adjustment device contains the holding device the necessary information to determine the appropriate exchange positions for the various format inserts. For example, this adjustment device could is a hinge mechanism that works in different, different Corresponding angular positions snap into place.

It means no special effort if the one dealing with the format change Operator the setting of the appropriate for the respective format insert Manually selects the adjustment device. However, it is conceivable that this embodiment to further develop that the printing press has a sensor for detecting the respectively used Format inserts and an actuator for automatic selection of the corresponding Has setting in response to the detection signal of the sensor.

That in the above embodiments for the correct alignment of the to be clamped End edge of the printing plate serving printing plate guide, which is for example, around one or more idlers on a support frame that changes position can act, is formed in a further advantageous embodiment of the invention, that it can be shifted from the respective change position to a standby position. In this standby position it is further from the printing press relative to the change position moved away and thus allows good access when changing formats, an unhindered Course of the printed sheets during the printing process and at the same time facilitates loading with a new pressure plate.

Fig. 1 (a)

eine schematische Seitenansicht einer Druckmaschine mit eingesetztem Formateinschub und einer Vorrichtung zum Zuführen einer Druckplatte in Wechselposition,

Fig. 1 (b)

die Druckmaschine von Fig. 1 (a), bei der die Zuführvorrichtung in eine Bereitschaftsstellung verlagert ist,

Fig. 2 (a)

eine Fig. 1 (a) entsprechende Darstellung mit einem fiir ein kleineres Format bestimmten Formateinschub, und

Fig. 2 (b)

eine Fig. 1 (b) entsprechende Darstellung, jedoch mit dem Formateinschub von Fig. 2 (a).

Further features, details and advantages of the invention result from the following description and drawing of an exemplary embodiment. In it show:

Fig. 1 (a)

1 shows a schematic side view of a printing press with inserted format insert and a device for feeding a printing plate into the changing position,

Fig. 1 (b)

1 (a), in which the feed device is shifted into a standby position,

Fig. 2 (a)

a representation corresponding to FIG. 1 (a) with a format insert intended for a smaller format, and

Fig. 2 (b)

a representation corresponding to Fig. 1 (b), but with the format insert of Fig. 2 (a).

A printing machine 1 shown in FIGS. 1 (a) and 1 (b) has in a known manner a plate cylinder 2, a blanket cylinder 3 and an impression cylinder 4, the Axes of rotation 5, 6 and 7 extend perpendicular to the plane of the drawing and with their ends in parallel to the plane of the drawing, axially spaced side parts 8 of one Format inserts 9 are stored.

Two axially spaced parts extend parallel to the side parts 8 of the format insert 9 Side parts 10 of the printing press 1, into which the format insert 9 in a known manner is used interchangeably. The bearing positions of the axes of rotation 5, 6, 7 in the side parts 8 of the format insert 9 arranged such that when the format insert is inserted 9 the correct interaction with the non-interchangeable other elements the printing press 1, in particular the one used to drive the format insert 9 Elements is ensured

In the plate cylinder 2 is an axially extending and to its cylinder jacket 11 open plate channel 12 designed for clamping a pressure plate 13 on the Plate cylinder 2, the front end edge 14 of the pressure plate 13 is angled such that it introduced in approximately radial direction in the plate channel 12 and there with in the drawing Clamping means not shown can be determined. Then the plate cylinder is in Fig. 1 rotated clockwise, whereby the pressure plate 13 by the between the Plate cylinder 2 and the rubber cylinder 3 formed nip pulled through is applied to the cylinder jacket 11 of the plate cylinder 2. The format of the printing plate 13 and the diameter of the plate cylinder 2 are coordinated so that finally the angled rear end edge 15 of the pressure plate 13 also in the plate channel 12 enters and is also clamped there.

Since the pressure plate 13 has to be changed relatively frequently, this is to make it easier this process a schematically illustrated device 16 for feeding the Pressure plates 13 are provided in the changing position on the plate cylinder 2. The device 16, in Fig. 1 (b) in a standby position somewhat moved away from the printing press 1 is shown, has in the illustrated embodiment with respect to the Printing machine 1 locally displaceable suspension element 17 and an end thereon pivotably articulated frame element 18, the opposite of the suspension element 17 free end of one of the angled front end edge 14 of the printing plates 13 has corresponding bend 19. The frame element 18 is not shown in FIG shown near the bend 19 and a pressure plate guide 20 At least one support roller element 21 is arranged at a distance therefrom, the pressure plate guide element 20 carries at least one guide roller 22, for example by a pneumatic Actuator substantially transverse to the plane of the frame member 18 and a printing plate 13 arranged thereon can be moved.

The standby position of the device 16 shown in FIG. 1 (b) is suitable for to place a pressure plate 13 so that it has its angled front end edge 14 strikes the bend 19 of the frame member 18 and with its plane on the Support roller element 21 and the guide roller 22 rests. To secure the inserted pressure plate 13 To keep in the inserted position, guides, brackets or not shown Counter rollers can be provided, which the pressure plate 13 in its contact with the pressure plate guide element Hold 20. Next are both the support roller elements 21 and Guide rollers 22 preferably in pairs for supporting both edge areas of the pressure plate 13 arranged.

1 (a) and 1 (b) is on the two side parts 10 of the format insert 9th In each case, a positioning element 23 is provided, which in the illustrated embodiment in the form of an open to the free edge 24 of the side parts 10 and on the opposite End 25 closed guide groove is formed. This guide groove serves as a positioning element for the complementary pressure plate guide element 20 having front area 26 of the frame element 18. The device 16 is moved from the standby position shown in Fig. 1 (b) to that in Fig. 1 (a) Change position shown spent by the front formed as a counter element Area 26 of the frame element 18 with translational displacement of the suspension element 17 and pivoting of the frame element 18 into the positioning element 23 guiding groove is inserted. The closed end 25 and determine Inclination of the positioning element 23 for the change position of the concerned Format inserts 9 required position and orientation of the feed device 16. In this Change position can then, as shown in Fig. 1 (a), by a pneumatic displacement the guide roller 22 to the cylinder jacket 11 of the plate cylinder 2 towards the angled front end edge 14 inserted into the plate channel 12 rotated into the change position and the clamping process already described above can be carried out.

1 (a) and 1 (b) differ from FIGS. 2 (a) and 2 (b) only by the fact that in the printing press 1 one intended for a different format Format insert 9 'is used. All other elements are the same. In this respect, is on their Description in Figs. 1 (a) and 1 (b) referenced.

The format insert 9 'differs from the format insert 9 only in terms of the position of the axes of rotation 5 ', 6' and 7 'of the plate cylinder 2', blanket cylinder 3 'or impression cylinder 4 'and the cylinder diameter. Corresponding to that used in Fig. 2 smaller format, these diameters are smaller than in Fig. 1 Fig. 1 conditional change in the change position bears in terms of their inclination and Location of the closed end 25 'different design as the positioning element 23 'serving guide groove on the side parts 10' of the format insert 9 bill. If hence the feed device with its front region 26 in serving as a counter element 1 is inserted into the guide groove 23 ' it, as shown in Fig. 2 (a), that applicable to the replaced format cassette 9 ' Exchange position.

As an alternative to the illustrated and described embodiment, instead of Positioning elements 23, 23 'and the counter elements of the front area 26 an adjusting device for the translational movement of the suspension element 17 and the pivoting movement of the frame element 18 can be provided, the one of the change positions has the corresponding number of settings and therefore for each format slot 9 takes the correct exchange position. Instead of these settings by hand the press 1 could select a sensor for the respective format cassette 9, 9 ', the output signal for an automatic selection of the corresponding Setting is used.

List of reference symbols

1

press

2,2 '

plate cylinder

3,3 '

rubber cylinder

4,4 '

Impression cylinder

5, 5 ', 6, 6', 7, 7 '

rotational axes

8th

side panel

9

format slide

10

side panel

11

cylinder surface

12

disk channel

13

printing plate

14

leading end edge

15

rear end edge

16

contraption

17

suspension

18

frame element

19

angulation

20

Druckplattenleitelement

21

Support roller element

22

sheave

23

positioner

24

free margin

25, 25 '

closed end

26

front area

Claims (5)

1. Device for feeding a printing plate (13) to a plate cylinder (2, 2') of a printing machine (1) into a changeover position, in which the edge (14) of the printing plate (13) can be transferred into a clamping device (12) of the plate cylinder (2, 2'), characterized in that the printing machine (1) has a number of replaceable formatting slide-in elements (9, 9') assigned to it, that are selectively inserted into the printing machine (1) and in which, in each case, the plate cylinder (2, 2') is supported with a diameter corresponding to a chosen format, and in that the feeding device (16) has a number of settings, corresponding to the number of formatting slide-in elements (9, 9'), by means of which the appropriate changeover position for the given formatting slide-in element (9, 9') is determined.
2. Device in accordance with claim 1, characterized in that a positioning element (23, 23') that determines the given settings, is provided, on an edge (14) of the printing plate (13) to be clamped, with an aligning, printing-plate guiding element (20) for a counter element (26) that can be brought into contact with the said positioning element (23, 23').
3. Device in accordance with claim 1, characterized in that a holding device, that is supported on a stationary part, particularly the printing machine, that takes up the formatting slide-in element, and that is connected, at a free end, to a printing plate guide element that aligns the edge of the printing plate to be clamped, has a setting mechanism with a number of settings, corresponding to the changeover positions, for the free end.
4. Device in accordance with claim 3, characterized in that the printing machine has a sensor for detecting the given formatting slide-in element being used, and an operating member for automatic selection of the corresponding setting in response to the detection signal of the sensor.
5. Device in accordance with one of claims 2 to 4, characterized in that the printing plate guide-element (20) can be shifted from the given changeover position into a position of readiness.

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