EP1481803B1 - Plate cylinder for a printing press - Google Patents

Description

The invention relates to a plate cylinder of a printing press according to the preamble of claim 1.

The EP 1 155 837 A2 shows a device for fixing flexible pressure plates on the plate cylinder, which comprises a cylinder body arranged in the clamping device and arranged outside of the plate cylinder segmented Andrückleiste, wherein a clamping device clamps all printing plates. The disadvantage is that with a change of a pressure plate, the clamping device releases the ends of all printing plates, thus the other not to be changed printing plates must be pressed and held on the plate cylinder by means of the segmented Andrückleiste for changing this one printing plate, so that the ends of the not to be changed printing plates do not slide out of the clamping channel.

The invention has for its object to provide a plate cylinder of a printing press, which achieves voltages of the printing plates by simple means.
This object is solved by the characterizing features of claim 1.

It is important that the clamping rail is arranged so movable in the clamping channel, so that the leading end of the plate can be fixed by the movable in a first position clamping rail with a holding element against a contact surface, which after rotation of the plate cylinder, the trailing end of the plate at the in a second position extended clamping rail is suspended and after which the clamping rail for tensioning this plate end is retractable to a third position.

Another advantage is that the clamping rail can be tensioned by a spring element in the direction of movement of the clamping rail movement, so that the introduction of the clamping force is in the field of plate fixing.

By means of the designed with different areas (switch lifts) or a switching profile push rod responsiveness or operation of each clamping rail and thus each individual pressure plate from the control room is possible. An automatic or semi-automatic plate clamping device can be achieved by means of an adjusting device provided for the push rod.

It is important that at least one fixed gap for the insertion of the plate ends is present in the cylinder for the respective clamping device on the circumference. The advantage is that the printing forme does not damage its multiple use while changing. The interaction of the holding elements in the printing plate change with the contact surfaces in the clamping channel allows the printing process under the aspect of minimizing channel collisions favoring narrow channel gap at the periphery of the plate cylinder. The channel width is preferably less than 3.5 millimeters. It is noteworthy that the cylindrical body is not weakened by the narrow clamping channel and there is only a slight risk of contamination of the slide rails or the entire device for attaching flexible printing plates.

It is significant that in a single-round plate cylinder by means of a push rod two slide rails can be operated. This allows less weakening of the single-round cylinder by splitting the functions.

Further advantageous embodiments of the invention are contained in the subclaims.

Fig. 1:

einen Querschnitt einer Vorrichtung mit einer auf einem Plattenzylinder befestigten Druckform,

Fig. 2:

Vorrichtung gemäß Fig. 1 beim Einschieben eines nachlaufenden Endes der Druckform in einen Spannkanal des Formzylinders,

Fig. 3:

Vorrichtung gemäß Fig. 1 vor der Klemmung des eingeschobenen zweiten Endes der Druckform im Spannkanal,

Fig. 4:

einen Bewegungsmechanismus für die Vorrichtung gemäß Fig. 1 in Stellung A,

Fig. 5:

den Bewegungsmechanismus gemäß Fig. 4 in Stellung B oder C

Fig. 6:

Plattenzylinder für vier Druckplatten mit Spannschienen, wobei jeweils zwei Spannschienen von einer Schubstange angesteuert sind,

Fig. 7:

Plattenzylinder für vier Druckplatten mit Spannschienen, wobei die mittleren Spannschienen von einer Schubstange und die äußeren Spannschienen von jeweils einer Schubstange angesteuert sind und

Fig. 8:

Plattenzylinder für vier Druckplatten mit Spannschienen, die jeweils von einer Schubstange angesteuert sind.

The invention will be explained in more detail using an exemplary embodiment. In the accompanying drawings show:

Fig. 1:

a cross section of a device with a plate cylinder mounted on a printing forme,

Fig. 2:

Device according to Fig. 1 when inserting a trailing end of the printing forme into a clamping channel of the forme cylinder,

3:

Device according to Fig. 1 before the clamping of the inserted second end of the printing plate in the clamping channel,

4:

a movement mechanism for the device according to Fig. 1 in position A,

Fig. 5:

according to the movement mechanism Fig. 4 in position B or C

Fig. 6:

Plate cylinder for four printing plates with slide rails, two slide rails each being driven by a push rod,

Fig. 7:

Plate cylinder for four pressure plates with slide rails, wherein the middle slide rails are driven by a push rod and the outer slide rails of each push rod and

Fig. 8:

Plate cylinder for four printing plates with slide rails, each driven by a push rod.

Fig. 1 shows a section of a plate cylinder 1 with a recess extending in its longitudinal direction 2, which may be a channel-like cutout, in which a clamping device 3 is arranged. The clamping device 3 has a guide element 4, which is fastened in a bore 30. In the guide member 4, a plunger 5 is slidably mounted, wherein the plunger 5 is pressed by a arranged on the guide member 4 compression spring 6 inwardly. At least one plunger 5, a clamping rail 17 is arranged. At least one tensioning rail 17 per pressure plate is required. On the guide member 4, a scraper 7 is arranged to strip the ram 5 adhering dirt. On the tensioning rail 17, a holding element 9 is arranged for clamping a leading plate end 8. The Retaining element 8 is for example a leaf spring. The designed as a leaf spring retaining element 9 can also be replaced by a corresponding molding surface on the clamping rail 17. For receiving a trailing plate end 10 (see Fig. 2 ), a holding element 11 is arranged on the clamping rail 17. The plunger 5 has a roller element 12 which can run on a push rod 13. The push rod 13 is slidably guided by means of roller elements or sliding elements 14, 15 in the forme cylinder 1 in a recess 31, which may be a channel-like cutout. Fig. 1 shows the already made inserting and clamping the leading plate end 8. In this case, the plunger 5 is in a position B. In the position B, the clamping rail 17 is in the clamping position. The push rod 13 has in the position B has no influence on the plunger 5 (see Fig. 5 ), since the roller element 12 can not run on the push rod 13 due to the distance. In position B, the plunger 5 and the clamping rail 17 is pressed by means of the compression spring 6 inwardly, the leading plate end 8 is pressed by the holding element 9 against a contact surface 16 on the plate cylinder 1. In this case, the leading end of the plate 8 may be configured with a folded bevel 28 at an acute angle. The contact surface 16 is designed to extend obliquely inwardly in accordance with the fold 28 of the plate end 8 in order to obtain the largest possible contact surface and to allow a positive and / or frictional connection between the contact surface 16 and plate end 8. This clamping of the plate end 8 by means of the retaining element 9 is only required if the trailing end of the plate 10 is not fixed yet. Thus, the printing forme is safe and accurate at the plate cylinder 1 fastened during the printing plate change. The channel-shaped recess 31 is closed in the region of the push rod 13 with a filling piece 19. The filler 19 is closed to the cylinder body of the plate cylinder 1. Preferably, the filler 19 is bolted or welded to the cylinder body of the plate cylinder 1. The recess 2 is closed in the region of the clamping rail 17 with a filler 20 such that a plate ends 8, 10 receiving clamping channel 18 is formed. The clamping channel 18 is designed in the region of the cylinder surface with a small gap, which is preferably less than 3.5 millimeters wide, wherein the clamping channel 18 widens in the direction of the clamping rail 17 to to ensure the mobility of the holding elements 9, 10, the clamping rail 17 and the plunger 5.

Fig. 2 shows the pivoting of the trailing plate end 10 in the clamping channel 18, the plunger 5 is thereby in a position A. In the position A, the clamping rail 17 is in the release position. The trailing plate end 10 is pressed by an operator or an automatically operated pressure roller in the holding member 11. The holding element 11 may be configured as a form element which cooperates with the plate end 10, which is preferably configured with a fold 29, in a positive and / or non-positive manner.

Fig. 5 shows how the tensioning rail 17 is spent in the position A, is. The push rod 13 is on its side to the plungers 5 with a switching profile 21, the elevations 22 and troughs 23, designed. To spend the tensioning rail 17 in the position A, the push rod 13 is displaced axially by means of an adjusting device 24 or manually in the direction 25. The push rod 13 runs during the axial displacement by means of their rollers or sliding elements 14, 15 guided on the cylinder body or on the filler 19 and is pressed against a frontally arranged compression spring 26. During the displacement of the push rod 13, the rollers 12 of the plunger 5 come into engagement with the elevation 12. The plunger 5 are deflected against the force of the compression springs 6 and the tensioning rail 17 is positioned in the radial direction in the position A.

The adjusting device 24 may be accommodated in the plate cylinder 1. If no adjustment device 24 is arranged in the plate cylinder 1, the push rod 13 can be actuated after rotation of the cylinder into a corresponding position by means of an end-mounted external adjusting device 24 which can be driven by hand or by means of a pneumatic or hydraulic drive.

Equivalently, a radially movable element, for example a shaft designed with switching cams, can be used as an alternative to the axially displaceable push rod 13 (not shown in more detail).

Fig. 3 shows the tensioning of the trailing plate end 10, the plunger 5 is moved back to a position C for clamping. In position C, the clamping rail 17 is in the clamping position. Fig. 4 shows how the tensioning rail 17 is moved to the position B or in the position C. In order to spend the tensioning rail 17 in the position A, the push rod 13 is displaced axially by means of the adjusting device 24 or manually in the direction 27. The push rod 13 runs during the axial displacement by means of their rollers or sliding elements 14, 15 guided on the cylinder body or on the filling piece 19 and is pressed by the end face arranged compression spring 26 back. During the displacement of the push rod 13, the rollers 12 of the plunger 5 are no longer in engagement with the push rod 13, but lie in the region of the sinks 23 and can rebound freely. The plunger 5 are deflected by the force of the prestressed compression springs 6 in the direction of the wells 23 and the clamping rail 17 is positioned in the radial direction in the position B or in the position C. Thus, the trailing end plate 10 is pulled by the holding member 11 and the tensioning rail 17 in the clamping channel 18 and the pressure plate clamped to the cylinder jacket, wherein the leading end plate 8 is pulled against the contact surface 16 on the plate cylinder 1 by tensioning the printing plate to the cylinder jacket and thus fixed.

The position B is used to fix the leading plate end 8 during the printing plate change, wherein the leading plate end 8 is pressed by means of the holding element 9 against the contact surface 16 on the plate cylinder 1.

There is one push rod 13 per clamping rail 17 is provided (see Fig. 8 ).
In the case of plate cylinders 1 with a small diameter, in each case one push rod 13 can be inserted into the recess 2 from one end face, wherein the two right slide rails 17 are actuated by a push rod 13 which is adjustable from the right end side and the two left slide rails 17 by one from the left Front side of adjustable push rod 13 are controlled (see Fig. 6 ). In order to accomplish an independent or individual control of the respective of a push rod 13 operated clamping rails 17, the switching profiles 21 of the push rod 13 are so offset arranged to each other, that upon actuation of one of the clamping rails 17 by means of the elevations 22, the non-operated clamping rail 17 in the region of the wells 23 is located. In the case of plate cylinders with a larger diameter, the two outer slide rails 17 can each be controlled by a push rod 13, the middle two slide rails 17 can either by a push rod 13 (see Fig. 7 ) or two push rods (see Fig. 8 ).

Alternatively, an axial bore in the region of the push rod 13 is conceivable instead of the channel-shaped recess 31. Then eliminates the lower filler 19th

The ejection of the pressure plate is such that the trailing end plate 10 is released by moving the clamping rail 17 in position A and by means of rotation of the plate cylinder 1 in reverse (contrary to the direction of rotation during printing) is pushed out. The release of the plate end 10 may be such that the clamped in position C by means of the clamping rail 17 pulled in and clamped plate end 10 is first stretched and released to release the plate end 10, the tensioning rail 17 in the position A, wherein due to the release of the force from the tension the plate end 10 from the retaining element 11 and the clamping channel 18 slips out. The leading plate end 8 is clamped again immediately after releasing the plate end 10, wherein the clamping rail 17 is pulled by means of the released spring force of the spring element 6 in the B position. The operator goes on-site and can unmount the leading plate end 8 from the tensioning rail 17 or the tensioning channel 18, with the tensioning rail 17 being moved to position A for this purpose. Subsequently, the operator hangs the leading end 8 of the new pressure plate in the clamping channel 18, the clamping rail 17 is moved to position B for clamping the leading plate end 8 and by rotating the plate cylinder 1 in the direction of rotation pressure, the new plate is retracted, wherein when hanging the trailing End 10 of the new pressure plate, the clamping rail 17 is moved to the position A and after hanging by moving the clamping rail 17 in position C, the plate end 10 clamped and the pressure plate is clean and accurately clamped on the cylinder circumference, wherein the holding element 9 in the position C, the leading end of the plate 8 is not touched and pulled by clamping the printing plate to the cylinder jacket the plate end 8 against the contact surface 16 on the plate cylinder 1 and fixed becomes.

List of used reference signs:

1

form cylinder

2

recess

3

clamper

4

guide element

5

tappet

6

compression spring

7

stripping element

8th

leading end of plate

9

retaining element

10

Trailing plate end

11

retaining element

12

roller element

13

pushrod

14

Roller element / sliding element

15

Roller element / sliding element

16

contact surface

17

tensioning rail

18

chip channel

19

filling

20

filling

21

switching profile

22

survey

23

depression

24

adjustment

25

Direction of movement

26

compression spring

27

Direction of movement

28

fold

29

fold

30

drilling

31

recess

A

Position A

B

Position B

C

Position C

Claims (10)

1. A plate cylinder (1) of a printing machine having a clamping channel (18) which extends in the axial direction with means for fixing the plate ends (8; 10) at least of one printing plate that can be positioned on the plate cylinder (1), wherein the leading plate end (8) can be fixed by a draw-out clamping bar (17), which can be moved in the clamping channel (18), with a holding element (9) against an abutment surface (16) of the plate cylinder, wherein after rotation of the plate cylinder (1) the trailing plate end (10) can be suspended on the drawn-out clamping bar (17) and after which the clamping bar (17) can be drawn in again to clamp this plate end (10), and, in each case, the at least one clamping bar (17) that fixes a plate end (8; 10) can be moved into at least a first and a second position by means of an axially displaceable thrust rod (13), and the thrust rod (13) has regions (22, 23) of differing height by means of which the clamping bar (17) can be moved into a gripping, clamping or releasing position, characterised in that the regions (22, 23) of differing height are used to position at least one plunger (5) that is connected to the clamping bar (17), wherein depending on the position of the plunger (5) the clamping bar (17) can be brought into the gripping or releasing position.
2. A plate cylinder according to claim 1, characterised in that the clamping bar (17) can be clamped by means of a spring element (6) in the direction of movement of the clamping-bar movement so that the introduction of the clamping force lies in the region of the plate fixation.
3. A plate cylinder according to claim 1, characterised in that the leading plate end (8) is configured with an edge-bend (28) in the region of an abutment surface (16) of the plate cylinder (1), and in that the trailing plate end (10) is configured with an edge-bend (29), preferably with a double edge-bend, in the region of the clamping bar (17).
4. A plate plate cylinder according to one of claims 1 to 3, characterised in that the displacement of the thrust rod (13) is effected by means of an adjusting device (24) that is worked out by hand or by means of an adjusting device (24) that is configured with a pneumatic or hydraulic drive.
5. A plate cylinder according to claim 4, characterised in that the thrust rod (13) can be connected at one end to the adjusting device (24); at the other end it is mounted so as to be stayed on the cylinder body by means of a spring element (26).
6. A plate cylinder according to one of claims 1 to 5, characterised in that the clamping bar (17) in the drawn-out position (A) extends within the cylinder body.
7. A plate cylinder according to one of claims 1 to 6, characterised in that the holding elements (9; 11) are leaf springs and/or formed elements or formed surfaces that are arranged on the clamping bar (17).
8. A plate cylinder according to one of claims 1 to 7, characterised in that the clamping bar (17) is accommodated with the plunger (5) and thrust rod (13) in a recess (31) of the plate cylinder (1), in that the recess (31) is closed in the region of the thrust rod (13) by means of a screwed or welded filling piece (19), in that the size and shape of the clamping channel (18) that receives the plate ends (8; 10) in the region of the clamping bar (17) are brought about by means of a screwed-in or welded filling piece (20).
9. A plate cylinder according to one of the preceding claims, characterised in that the thrust rod (13) can be actuated from the end side of the plate cylinder (1).
10. A plate cylinder according to claim 9, characterised in that the clamping channel (18) is configured so that it widens inwards in order to accommodate a gripping device (3) with the clamping bar (17) and holding elements (9; 11).

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