EP1256449A1 - Printing unit with a plate cylinder and with an insertion bar - Google Patents

Abstract

A printing unit with a plate cylinder (10, 24), which has an axially extending channel (12) for receiving at least one rear edge of a printing plate, and with an insertion strip (16, 26), which has an operating position (38) from which it Pushes the rear edge of the pressure plate into the axially extending channel (12), is characterized by an insertion strip drive (36, 46) for automatically moving the insertion strip (16, 26) from the operating position (38) to a rest position (39, 40). <IMAGE>

Description

The present invention relates to a printing unit with a plate cylinder and with a Insert strip according to the preamble of claim 1.

Furthermore, the present invention relates to a method for inserting a Trailing edge of a printing plate in a channel of a plate cylinder according to the Preamble of claim 7.

Offset printing machines include a plate cylinder and a blanket cylinder to Images to be printed on a material web, e.g. B. a paper web to transmit.

A flat pressure plate is usually placed axially on the plate cylinder running cylinder gap or channel attached. The front edge of the plate is in the Channel inserted and the plate cylinder is rotated so that the plate through the Pressure in the gap formed between the printing plate and the rubber blanket Puts the plate cylinder around.

Since the pressure plates are usually hooked into the cylinder channel by hand, it is necessary to be able to create free access to the channel. The cylinder will for this purpose is placed in a plate change angular position in which the cylinder channel is facing an operator. After hanging and pulling in the pressure plate it is still necessary, the pressure plate trailing edge in the cylinder channel or in one insert another cylinder channel. For this purpose, there are insert strips from the prior art Known, which on actuation of the operator or automatically the rear edge in push an associated cylinder channel, one located in the channel Clamping device can be provided at least for clamping the rear edge.

The use of an insert strip according to the prior art is required of free access to the cylinder channel and can thus cause problems with Perform plate changes.

Furthermore, roller gap guards are known from the prior art, which the Cover gaps formed between two rollers or cylinders to prevent an operator injured himself at the columns. These roller nip guards also stand up to this Require free access to the cylinder channel and can cause problems lead when changing plates.

It is an object of the present invention to provide a printing unit which eliminates the aforementioned problems in the prior art.

It is another object of the present invention to provide a printing unit which gives an operator access to a cylinder channel when changing plates.

It is also an object of the present invention to provide known devices according to the State of the art, which support the plate change and / or as Roller nip protection serve to simplify and therefore cheaper and less maintenance-intensive to provide.

An additional object of the present invention can be seen in one To create printing unit, which makes it easier for an operator to change the printing plate simultaneous compliance with given safety regulations.

These tasks are achieved by a device with the features according to at least one of claims 1 to 6 solved

Furthermore, it is an object of the present invention to provide a method which simplifies the printing plate change or supports the operator.

It is another object of the present invention to provide a method using which is both a simple printing plate change and compliance with given safety regulations is made possible.

These tasks are accomplished by a method with the features according to at least one of claims 7 to 9 solved.

An inventive printing unit with a plate cylinder that has an axially extending Has channel for receiving at least one rear edge of a pressure plate, and with an insert that has an operating position from which it traces the rear edge of the Pushes pressure plate into the axially extending channel, is characterized by a Insert strip drive for automatically moving the insert strip out of the Operating position out in a rest position.

Through the provision according to the invention of an insertion strip drive for automatic Moving the insert bars from an operating position to a rest position an operator advantageously has unhindered access to a plate cylinder procured so that the operator is undisturbed by nearby mechanical components the plate cylinder can change the printing plate.

During the application of printing plates it may be necessary to use the printing machine to run forward and backward to the position of the axially extending channel adjust on the plate cylinder.

A first blanket cylinder adjacent to the plate cylinder can be provided be, with the insertion strip in its operating position close to one between the Plate cylinder and the first blanket cylinder formed gap, preferably around that between the plate cylinder and the blanket cylinder cover formed gap and thus to ensure increased security when the Web is moved forward.

A second blanket cylinder can adjoin the first blanket cylinder, whereby the insert bar in its rest position close to that between the first and the second blanket cylinder formed gap, preferably by an increased Ensure safety when the web is moved backwards.

By covering the gap between the blanket cylinders, the insert strip points at the same time the function of a roll nip protection, so that it is advantageous a reduction in the mechanical components in the access area to the Printing units is coming.

The insert strip drive can continue to be operatively connected to the insert strip have standing lever, which is a manual movement of the insert from the Operating position in the rest position to carry out cleaning and Maintenance work enabled.

The plate cylinder and the insertion strip can be mounted in a frame, whereby the insert drive is attached to the frame.

The insertion strip drive preferably comprises an eccentric disk.

Furthermore, the insertion strip drive preferably comprises a pneumatic motor for rotating the eccentric disc.

A method according to the invention for inserting a trailing edge of a printing plate into an axially extending channel of a plate cylinder, with an insertion strip is provided, the rear edge of the pressure plate in the axial from an operating position sliding channel is characterized by the fact that the insertion bar automatically is moved from the operating position to a rest position.

Furthermore, the method can cover a gap between the plate cylinder and an adjacent blanket cylinder by means of the in their operating position include the insert bar.

One between the blanket cylinder adjacent to the plate cylinder and one Another blanket cylinder gap formed by means of the in its rest position insert strips are covered.

The features of the present invention will become apparent in the following description preferred embodiments in connection with the accompanying, below listed drawings explained in more detail.

Fig. 1

einen schematischen Querschnitt einer bevorzugten Ausführungsform eines erfindungsgemäßen Druckwerks;

Fig. 2

einen schematischen Querschnitt einer alternativen Ausführungsform eines erfindungsgemäßen Druckwerks;

Fig. 3

eine perspektivische Darstellung einer Ausführungsform eines Antriebs für die Einfügeleiste, wobei sich die Einfügeleiste in der Betriebsposition befindet;

Fig. 4

eine perspektivische Darstellung eines Abschnitts des in Fig. 3 gezeigten erfindungsgemäßen Antriebs der Einfügeleiste, bei welcher der Pneumatikzylinder nicht dargestellt ist, um den Blick auf eine Exzenterscheibe freizugeben;

Fig. 5

eine perspektivische Darstellung des in Fig. 4 gezeigten Antriebs der Einfügeleiste, wobei sich die Einfügeleiste in einer Ruheposition befindet.

Show it:

Fig. 1

a schematic cross section of a preferred embodiment of a printing unit according to the invention;

Fig. 2

a schematic cross section of an alternative embodiment of a printing unit according to the invention;

Fig. 3

a perspective view of an embodiment of a drive for the insertion bar, wherein the insertion bar is in the operating position;

Fig. 4

a perspective view of a portion of the drive according to the invention shown in Figure 3 of the insertion bar, in which the pneumatic cylinder is not shown to reveal the view of an eccentric disc.

Fig. 5

a perspective view of the drive shown in Fig. 4 of the insertion bar, wherein the insertion bar is in a rest position.

Corresponding elements are given the same reference numerals in the figures characterized.

Fig. 1 shows a schematic cross section of a preferred embodiment of a Printing unit according to the invention of a printing press 1. The printing press 1 comprises a plate cylinder 10 with an axially extending channel 12. A flat pressure plate 14 has a leading edge which is inserted into this channel 12. An insertion bar 16 is provided which inserts the rear edge of the pressure plate 14 into the channel. After that you can the plate is clamped and thus fixed in its position. This can be done in the channel 12 at least one clamping device can be provided.

The plate cylinder 10 interacts with a blanket cylinder 20, on which a flat or a sleeve-shaped rubber blanket can be arranged. Between the plate 14 and the blanket there is a gap 18. Between the blanket cylinder 20 and Another blanket cylinder 22 is a transmission gap 23 through which one Web is passed through. With the blanket cylinder 22, a second Interact plate cylinder 24 with a second insertion strip 26.

The insertion bar 16 has a drive 36 which drives the insertion bar 16 through the arrow 38 designated operating position, from which the insert bar the trailing edge of the Plate 14 can slide into an axially extending plate cylinder channel 12 in a through the rest position indicated by arrow 39 moves. Can in the operating position Insert elements of the insert bar 16 are activated so that they can be controlled Trailing edge of plate 14, e.g. to those in U.S. Patent Application No. 09 / 572,361 contact and move as described. The insertion elements can e.g. can be operated pneumatically.

The drive 36 of the insertion bar 16 can preferably comprise the insertion bar 16 Position near the transfer nip 18 between the plate cylinder 10 and the Blanket cylinder 20 in the direction of the transfer gap 23 between the Move blanket cylinder 12 and the other blanket cylinder 22. The drive 36 can be used as a motor-driven four-swivel gearbox or as another Suitable linkage or gear can be formed, which is suitable, the insertion bar 16 e.g. along one adapted to the outer surface of the blanket cylinder 20 Moving bow. Alternatively, the drive 36 can be used as a motor-driven carriage be formed, which on an arcuate, the outer surface of the Blanket cylinder 20 adapted rail is arranged, the insertion bar 16th is firmly connected to the carriage 36.

The distance of the insertion bar 16 in the operating position 38 to the surface of the Plate cylinder 10 or to the surface of the blanket cylinder 20 can be chosen in this way be that the insertion strip 16 also serves as gap protection for the gap 18. there In particular, it should be ensured that an operator, e.g. when replacing one Pressure plate or a blanket, with no body part or not with one Tool can get into the gap 18. It is e.g. possible that the insertion bar 16 less than 10 mm or less than 5 mm or only about 1 mm from at least one of the Surfaces of the plate cylinder 10 or the blanket cylinder 20 is spaced. Equal distances can be for the insertion bar 16 in its rest position 39 with respect to the Blanket cylinder and the gap 23 may be provided. Even in the rest position 39 the insert bar 16 can also be used as roller gap protection, and a Prevent injury to an operator at gap 23.

It is a particular advantage of the present invention that one insert strip has several Can take over functions. It is used to insert at least one rear edge a pressure plate in a clamping channel of a cylinder or a roller as well Covering e.g. B. different roller or cylinder gaps and thus compliance given safety regulations. This way, both material and Costs are saved and maintenance and repair work is also carried out reduced and made cheaper. The bar can be used in advantage different positions cover different column.

The insertion bar 26 has a drive 46 which acts in a similar manner to that Drive 36.

The insertion bar 26 can also act as a pressure bar for at least one Trailing edge of a printing plate and used as roller gap protection. Result it the same advantages as above with reference to the insertion bar 16 have been described.

The nip 23 between the two blanket cylinders 20 and 22 can e.g. in the Be covered in such a way that both the insertion strip 16 in their rest position 39 positioned as well as the insertion bar 26 positioned in a corresponding rest position which is located with respect to the material web 5 opposite the rest position 39.

The information given above on the possible distances between the insertion strip 16 respective surfaces of the associated cylinders 10 and 20 apply accordingly to the insert bar 26 and the associated cylinders 22 and 24.

2 shows an alternative embodiment of a drive 136 for moving the Insertion bar 16 from an operating position 38 into a second one removed from the plate cylinder Rest position 40. FIG. 2 also shows that the insertion strip 26 also has a alternative embodiment of a drive 146 can be equipped, which the Insert strip 26 from its operating position into one of the associated plate cylinders 24 distant rest position moved.

It is also possible for the two drives 36 and 46 or 136 and 146 are coupled and thus the two insertion strips 16 and 26 corresponding to the Representation in Fig. 1 or Fig. 2 can be moved and positioned together. Furthermore, a common drive can be provided for the insertion strips 16 and 26, each of which is only a selected insertion bar of the two insertion bars 16 and 26 emotional.

3 shows a representation of the drive 136 arranged on the frame 100 and the Insert bar 16, which is here in the operating position. A pneumatic driven motor in the form of a rotatable pneumatic cylinder 137, which one Has an effective range of at least 180 °, one is not used in FIG. 3 to drive the eccentric disk shown. The pneumatic cylinder 137 can by Machine operators can be activated.

FIG. 4 shows an illustration of a section of the drive 136 from FIG. 3, here the Pneumatic cylinder is not shown so that the eccentric disc 138 can be seen. The Eccentric disc 138 is attached to frame 100 by a frame 100 Swivel axis 141 is rotatable and can be within a forked end plate 139 rotate, which in turn is pivotable relative to the frame 100 about its pivot axis 142. The forked end plate 139 is at its opposite end at one end of the Insert strip 16 attached.

By actuating the pneumatic cylinder 137, the eccentric disc 138 can be their axis 141 are rotated, thereby transferring the forked end plate 139 a pivoting movement of the end plate 139 with respect to its axis 142 is carried out. This pivoting movement furthermore becomes a movement of the insertion strip 16 between their operational and their rest position.

As shown in FIG. 5, the bifurcated end becomes the bifurcated end plate 139 at Rotation of the eccentric disc 138 moved to a raised position. The forked end plate 139 is pivoted about axis 142 and moves in this way the insert bar 16 in a position away from the plate cylinder to the application and To allow removal of a plate. A lever provided on the insertion bar 16 140 can be used to manually move the insertion bar into a distance from the plate cylinder Position used for cleaning and maintenance of the plate cylinder.

List of reference numbers

1

press

5

web

10

plate cylinder

12

axially extending channel

14

printing plate

16

Insert

18

Transmission gap between plate cylinder and blanket cylinder

20

Blanket cylinder

22

Blanket cylinder

23

nip

24

plate cylinder

26

Insert

36

Einfügeleistenantrieb

38

operating position

39

rest position

40

rest position

46

Einfügeleistenantrieb

100

frame

136

drive

137

pneumatic cylinder

138

eccentric

139

forked end plate

140

lever

141

swivel axis

142

swivel axis

Claims (10)

Printing unit with a plate cylinder (10, 24) which has an axially extending channel (12) for receiving at least one rear edge of a printing plate, and with an insertion strip (16, 26) which has an operating position (38) from which it forms the rear edge pushes the pressure plate into the axially extending channel (12),
marked by
a insertion strip drive (36, 46) for automatically moving the insertion strip (16, 26) out of the operating position (38) into a rest position (39, 40). Printing unit according to claim 1,
marked by
a first blanket cylinder (20, 22) adjoining the plate cylinder (10, 24), the insert strip (16, 26) being in its operating position (136) close to one between the plate cylinder (10, 24) and the first blanket cylinder (20, 22) formed gap (18). Printing unit according to claim 2,
marked by
a second blanket cylinder (22) adjoining the first blanket cylinder (20), the insert strip (16, 26) being in its rest position (39, 40) near the gap (23.) formed between the first and the second blanket cylinder (20, 22) ) is located. Printing unit according to one of the preceding claims,
marked by
a frame (100) in which the plate cylinder (10, 24) and the insertion strip (16, 26) are mounted, the insertion strip drive (36, 46) being fastened to the frame (100). Printing unit according to one of the preceding claims,
characterized in that the insertion strip drive (36, 46) comprises an eccentric disc (138). Printing unit according to claim 5,
characterized in that the insertion strip drive (36, 46) comprises a pneumatic motor for rotating the eccentric disc (138). Method for inserting a trailing edge of a printing plate into an axially extending channel (12) of a plate cylinder (10, 24), wherein an insertion strip (16, 26) is provided which, from an operating position (38), traces the trailing edge of the printing plate into the axially extending channel (12) pushes
marked by
the process step: automatic movement of the insertion bar (16, 26) from the operating position (38) to a rest position (39, 40). Method according to claim 7,
marked by
Covering a gap (18) between the plate cylinder (10, 24) and an adjacent blanket cylinder (20, 22) by means of the insert strip (16, 26) in its operating position. A method according to claim 8,
marked by
Covering a gap between the blanket cylinder (20) adjoining the plate cylinder (10, 24) and a further blanket cylinder (22) by means of the insertion strip (16, 26) in their rest position (39, 40). Printing machine, in particular web-fed rotary printing machine,
characterized by a printing unit according to one of claims 1 to 6.

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