EP2110246B1 - Printing plate exchanging device - Google Patents

Abstract

The printing plate exchangeable device (10) has a device (14) for receiving a printing plate in the area of the printing unit, on whose plate cylinder a printing plate exchange is carried out. A pivot arm (16) supported on a lateral wall of the printing unit, is moved between three positions with the help of a linkage (19) engaging on the lateral wall of the printing unit.

Description

The invention relates to a printing plate changing device.

From the prior art, for. B. off EP 0678382 A1 , out DE 39 40 796 C2 , out EP 0 435 413 B2 as well as out EP 0 933 206 B1 , a variety of printing plate changing devices for carrying out automatic printing plate changes on a printing unit of a printing press are known. All of these known from the prior art printing plate changing devices have in common that they require complex attachments to a printing unit and therefore either make a redesign of a printing unit of a printing machine and / or make access to form cylinders and transfer cylinders of the printing of such a printing unit. There is therefore a need for a printing plate changing device that requires neither expensive additions or conversions for a printing unit of a printing machine nor difficult access to the cylinders of the same.

On this basis, the present invention seeks to provide a novel printing plate changing device. This object is achieved by a printing plate changing device according to claim 1. The printing plate changing device according to the invention has a device for receiving a printing plate in the region of the printing unit, on the forme cylinder is to perform a printing plate change, and mounted on side walls of the printing unit on the swivel arm, which can be displaced by means of a likewise acting on the side walls of the printing unit articulation between at least three positions is a first position in which a to be positioned on the forme cylinder of the printing unit printing form on the means for receiving a pressure plate and in which a hinged in the device pressure plate is clamped to the pivot arm, and a second position in which a pressure plate clamped on the swivel arm can be fed to the forme cylinder of the printing unit, as well as a third or middle position located between the first position and the second position, in which the swivel arm together with a stationary guide element delimits a guide funnel via which an optionally removed from the forme cylinder Pressure plate in an old printing plate tray is inserted.

The printing plate changing device according to the invention has the advantage that it can be used on existing printing units and requires neither complex attachments nor redesigns of printing units. In addition, the printing plate changing device according to the invention does not hinder access to cylinders of the printing unit.

Fig. 1:

eine schematisierte Darstellung einer im Bereich eines Druckwerks positionierten, erfindungsgemäßen Druckplattenwechselvorrichtung;

Fig. 2:

ein Detail der Druckplattenwechselvorrichtung der Fig. 1 im Bereich einer Halteinrichtung für Druckplatten;

Fig. 3:

ein Detail der Druckplattenwechselvorrichtung der Fig. 1 im Bereich eines Schwenkarms;

Fig. 4:

ein Detail der Druckplattenwechselvorrichtung der Fig. 1 im Bereich einer Anlenkung für den Schwenkarm; und

Fig. 5:

ein Detail der Druckplattenwechselvorrichtung der Fig. 1 im Bereich eines Altdruckplattenfachs.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. An embodiment of the invention will be described, without being limited thereto, with reference to the drawing. Showing:

Fig. 1:

a schematic representation of a positioned in the region of a printing unit, printing plate changing device according to the invention;

Fig. 2:

a detail of the printing plate changing device of Fig. 1 in the area of a holding device for printing plates;

3:

a detail of the printing plate changing device of Fig. 1 in the region of a swivel arm;

4:

a detail of the printing plate changing device of Fig. 1 in the region of a linkage for the swivel arm; and

Fig. 5:

a detail of the printing plate changing device of Fig. 1 in the area of an old printing plate compartment.

Fig. 1 shows a schematic representation of a printing plate changing device 10 according to the invention together with a section of a printing unit 11, wherein the printing unit, a forme cylinder 12 and a transfer cylinder 13 are shown. The printing plate changing device 10 according to the invention serves to carry out a printing plate change on the forme cylinder 12 of the printing unit 11.

The printing plate changing device 10 according to the invention comprises a device 14 for receiving a printing plate 15 in the region of the printing unit 11, on the forme cylinder 12 of which a printing plate change is to be performed. Furthermore, the printing plate changing device 10 comprises a pivot arm 16 which is pivotally mounted about a pivot point 17 on side walls 18 of the printing unit or the printing unit. At the pivot arm 16 of the printing plate changing device 10 engages a linkage 19 of the printing plate changing device 10, wherein the linkage 19 is also mounted on the side walls 18 and serves the pivoting of the pivot arm 16 between different positions thereof. About the articulation 19 of the pivot arm 16 in the direction of the double arrow 20 about the pivot point 17 between at least three positions displaced.

In Fig. 1 takes the pivot arm 16 a first position, wherein in this first position on the forme cylinder 12 of the printing unit 11 to be positioned pressure plate 15 with an angled end, namely a leading end or a trailing end, can be mounted in the device 14 for receiving the printing plate. Furthermore, in this first position, a hinged in the device 14 pressure plate 15 on the pivot arm 16 can be clamped. In a second position of the pivot arm 16, the pressure plate 15 clamped on the swivel arm can be fed to the forme cylinder 12 in order to tension the same on the forme cylinder 12, wherein upon transfer of the swivel arm 16 from the in-cylinder Fig. 1 In the first position shown in this second position, the end of the pressure plate 15 hinged to the device 14 is previously released by the device 14, so that this end extends along the in Fig. 1 shown movement path 21 is moved in the direction of the forme cylinder 12 and can be inserted into a clamping channel thereof.

In addition to this first position and second position, the swing arm 16 can be transferred from the linkage 19 to a third position located between the first position and the second position, and thus a central position for the swing arm 16, wherein in this third position an old printing plate optionally to be removed from the forme cylinder 12 can be introduced into an old printing plate compartment 22 of the printing plate changing device 10 according to the invention, namely via a guide funnel bounded by the pivoting arm 16 and a fixed guide element 23.

Fig. 2 shows details of the device 14 for receiving a pressure plate 15, wherein the device 14 comprises two retaining pins 24. At the retaining pins 24, a pressure plate 15 with the leading end or the trailing end can be suspended. The retaining pins 24 lie on a straight line 25, which runs approximately parallel to a clamping channel of the forme cylinder 12, so as to ensure a diagonal register correct orientation of the pressure plate 15 relative to the forme cylinder 12 of the printing unit 11. One of the retaining pins 24 is associated with a stop 26, against which the hinged to the retaining pins 24 pressure plate 15 in the direction of arrow 27 can be pressed so as to additionally ensure a page register correct orientation of the pressure plate 15 to the forme cylinder 12 of the printing unit 11.

Each of the retaining pins 24 is linearly displaceably mounted on one of the side walls 18 of the printing unit, namely in receptacles 28 which are fixed on the side walls 18 via fitting bolts 29. For receiving a pressure plate 15, the retaining pins 24 in the in Fig. 2 shown moved position in which they are moved out of the receptacles 28 and moved toward each other. In this state, the retaining pins 24 are opposite to the receptacles 28. To release a hinged to the retaining pins 24 pressure plate 15, the retaining pins 24 are movable away from each other in a linear direction, wherein the same are then preferably retracted into the receptacles 28.

Then, when a pressure bar 15 is mounted on the retaining pins 24, the retaining pins 24 are only then retracted to release the pressure plate 15 in the receptacles 28 when previously the pressure plate 15 was clamped on the pivot arm 16 and thus fixed.

As Fig. 2 can be removed, the stop 26 is formed by one of the receptacles 28, namely of a frustoconical contoured end 30 thereof. According to Fig. 2 Both receptacles 28 have frustoconical contoured ends 30, wherein the frustoconical contoured ends 30 facilitate or support the mounting of the pressure plate 15 in the retaining pins 24.

The pivot arm 16 of the printing plate changing device 10 according to the invention (see in particular Fig. 3 ) has a guide plate 31, which extends at least over the width of the pressure cylinder 15 to be positioned on the forme cylinder 12 of the printing unit 11, preferably over the entire width of the forme cylinder 12. Further, the pivot arm 16 has a tension roller 32, which also extends at least over the width of the pressure cylinder 15 to be positioned on the forme cylinder 12 of the printing unit 11, preferably over the width of the forme cylinder 12. The tensioning roller 32 is transferable or displaceable between at least two positions, namely between the in Fig. 3 shown position 32, in which the tension roller 32 clamps a pressure plate in the region of the pivot arm 16, and the position 32 ', in which the tension roller releases a pressure plate.

The tensioning roller 32 is displaceable between these two positions along an adjusting cam 33, namely such that a clamping force for clamping a pressure plate is effective only in or immediately before the clamping position. In the Fig. 3 Accordingly, the tension roller 32 shown is located in a clamping position, wherein the tension roller 32, starting from this clamping position along the Anstellkurve 33 in the dashed lines shown release position 32 'can be transferred.

On the tension roller 32 are not shown plastic rings positioned at lateral ends of the same, which come when clamping a pressure plate 15 at lateral edge portions of the pressure plate 15 to the plant. In a central region between these plastic rings, the tensioning roller 32 is not located on the pressure plate 15 in the clamping position. In the areas in which the pressure plate 32 is pressed against the guide plate 31 via the positioned on the tension roller 32 plastic rings, plate-shaped brake elements 34 are applied to the guide plate 31 made of plastic, so that ultimately clamped in the region of the pivot arm 16 pressure plate between the on the tension roller 32 positioned plastic rollers and attached to the guide plate 31 brake elements 34 is clamped in plastic. By clamping a pressure plate 15 between such plastic elements can be avoided that the pressure plate is damaged during clamping and removal from the pivot arm during the clamping operation on the forme cylinder.

The pivot arm 16 has attachment portions 35, via which the pivot arm 35 is rotatably mounted on the side walls 18 of the printing unit. At these attachment portions 35 engages in Fig. 4 shown in solo representation articulation 19 of the printing plate changing device 10 according to the invention.

The articulation 19 for the pivot arm 16 preferably has on both sides of the pivot arm 16 each connected to the so-called cylinder bottom, extendable in opposite directions, preferably designed as a pneumatic cylinder cylinders 36 and 37. One of the cylinder 36 engages via a coupling element 38 to a mounting portion 35 of the swing arm 16 at. The other cylinder 37 engages a side wall 18 of the printing unit. Then, when both cylinders 36, 37 are extended in opposite directions, the pivot arm 16 occupies the first position, that is the in Fig. 1 shown position in which, as already mentioned, a pressure plate on the device 14 can be suspended and in which a hinged in the device 14 pressure plate 15 on the pivot arm 16 is clamped.

Then, however, when both cylinders 36, 37 retracted, the pivot arm 16 occupies the second position, in which a clamped on the pivot arm 16 pressure plate 15 to the forme cylinder 12 of the printing unit 11 can be fed. Then, when one of the cylinders 36 and 37 retracted and the other cylinder is extended, the pivot arm 16 occupies the third position, in which the pivot arm 16 together with the guide element 23 defines a guide funnel, via which a forme cylinder 12 to be removed pressure plate in the Altdruckplattenfach 22 is inserted.

Fig. 5 shows details of the old printing plate compartment 22 of the printing plate changing device 10 according to the invention. The old printing plate compartment 22 is movable up and down in the sense of the double arrow 39 between two different positions, namely between an in Fig. 1 illustrated lowered position and a in Fig. 1 not shown raised position.

In the raised position of the old printing plate compartment 22, a pressure plate to be removed from the forme cylinder 12 of the printing unit 11, when the pivot arm 16 occupies the third position and defines together with the guide element 23 a guide funnel, with an angled end, namely with a trailing end thereof, in the Altdruckplattenfach 22 inserted and locked with this end to a latch 40. By lowering the Altdruckplattenfachs 22 from the raised position in the raised position with the imported into the Altdruckplattenfach 22 end of the latch 40 locked pressure plate from the forme cylinder 12 of the printing unit 11 is removable and thus removable from the printing unit 11.

The Altdruckplattenfach 22 has a rear wall 41 and a pivotally mounted on the rear wall 41 front flap 42, wherein the front flap 42 is associated with a lifter 43.

After lowering the Altdruckplattenfachs 22 in the lowered position can open by opening the front flap 42 of the lifter 43 the locked at the latch 40 end of the imported into the old printing plate compartment 22 pressure plate 15 so that the pressure plate 15 can be removed from the Altdruckplattenfach 22.

A mounted at an upper end of the front flap 42 guide member 44 serves to guide a hinged in the device 14 pressure plate, namely at one end of the pressure plate 15, which is opposite to the end with which the pressure plate 15 is mounted in the device 14.

When tensioning a pressure plate 15 on the forme cylinder 12 of the printing unit 11 is a rolling element 45 is used, its structure and operation already from the EP 0 712 725 B2 is known, the disclosure of which is hereby incorporated by reference.

LIST OF REFERENCE NUMBERS

10

Printing plate changing device

11

printing unit

12

form cylinder

13

transfer cylinder

14

Facility

15

printing plate

16

swivel arm

17

pivot point

18

Side wall

19

linkage

20

double arrow

21

trajectory

22

Altdruckplattenfach

23

vane

24

retaining pin

25

Just

26

attack

27

arrow

28

admission

29

pass bolt

30

The End

31

guide plate

32, 32 '

tension roller

33

guide curve

34

braking element

35

attachment section

36

cylinder

37

cylinder

38

coupling element

39

double arrow

40

notch

41

rear wall

42

front flap

43

Lifters

44

guide element

45

rolling

Claims (10)

1. A printing plate changing device of a printing press, with a device (14) for receiving a printing plate in the region of the printing couple, on whose form cylinder a printing plate change is to be carried out, with a pivot arm (16) mounted on side walls of the printing couple, characterized in that the pivot arm with the help of an articulation (19) likewise acting on the side walls of the printing couple is displaceable between at least three positions, namely a first position, in which a print form to be positioned on the form cylinder of the printing couple can be hooked into the device (14) for receiving a printing plate and in which a printing plate hooked into the device (14) can be clamped on the pivot arm (16), and a second position, in which a printing plate clamped on the pivot arm (16) can be fed to the form cylinder of the printing couple, and a third position located between the first position and the second position, in which the pivot arm together with a fixed guide element (23) delimits a guide former, via which a printing plate to be removed from the form cylinder if applicable can be introduced into an old printing plate compartment (22).
2. The printing plate changing device according to Claim 1, characterized in that the pivot arm (16) comprises a guide plate (31) extending at least over the width of the printing plate to be positioned on the form cylinder of the printing couple and a tensioning roller (32) likewise extending at least over the width of the printing plate to be positioned on the form cylinder of the printing couple, wherein the printing plate to be positioned on the form cylinder of the printing couple can be clamped between the guide plate (31) and the tension roller (32).
3. The printing plate changing device according to Claim 2, characterized in that for clamping of a printing plate to be positioned on the form cylinder of the printing couple between the guide plate (31) and the tension roller (32) the tension roller (32) can be transferred from a release position, in which said tension roller releases the printing plate, into a clamping position, in which said tension roller clamps the printing plate, along an engagement curve (33) in such a manner that a clamping force for clamping the printing plate is only effective in or immediately before the clamping position.
4. The printing plate changing device according to any one of the Claims 1 to 3, characterized in that the articulation (19) on the pivot arm (16), which is pivotably displaceable on the side walls of the printing couple, acts on both sides of said printing couple.
5. The printing plate changing device according to Claim 4, characterized in that for pivoting the pivot arm (16) between the at least three positions the articulation on at least one side comprises two cylinders (26, 37) extendable in opposite directions, wherein when both cylinders are extended, the pivot arm (16) assumes the first position, wherein when only one of the two cylinders is extended, the pivot arm (16) assumes the third position, and wherein when both cylinders are retraced, the pivot arm (16) assumes the second position.
6. The printing plate changing device according to any one of the Claims 1 to 5, characterized in that the old printing plate compartment (22) can be transferred between at least two positions, namely between a lowered position and a raised position.
7. The printing plate changing device according to Claim 6, characterized in that in the raised position of the old printing plate compartment (22) a printing plate to be removed from the form cylinder can be introduced in said compartment with one end and can be locked in said compartment so that a printing plate clamped with one end in the old printing plate compartment (22) during the displacement of the old printing plate compartment from the raised position into the lowered position can be removed from the printing couple.
8. The printing plate changing device according to any one of the Claims 1 to 7, characterized in that the device for receiving a printing plate comprises at least two holding pins (24), wherein a printing plate to be positioned in the region of the printing couple can be hooked in on the holding pins (24) with an angled-off end, namely a leading end or a trailing end, wherein the holding pins (24) lie on a straight line, which approximately runs parallel to a lock-up channel of a form cylinder of the printing couple so as to guarantee a diagonal register-appropriate alignment of the printing plate relative to the form cylinder of the printing couple, and wherein one of the holding pins (24) is assigned a stop (26), against which the printing plate hooked in on the holding pins can be pressed in order to guarantee a page register-appropriate alignment of the plate relative to the form cylinder of the printing couple.
9. A printing plate changing device according to Claim 8, characterized in that a first holding pin (24) is mounted linearly displaceably on a first side wall (18) of the printing couple and a second holding pin (24) and a second holding pin (24) on a second side wall (18) of the printing couple in such a manner that for receiving a printing plate both holding pins (24) can be linearly moved towards each other and for releasing the received printing plate can be moved away from each other.
10. The printing plate changing device according to Claim 8 or 9, characterized in that each holding pin (24) is mounted on a mounting (28), wherein the respective mounting (28) is fastened to the respective side wall (18) of the printing couple, and wherein one of the mountings (28) forms the stop (26) for the page register-appropriate alignment of the printing plate relative to the form cylinder of the printing couple.

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