EP1338417B1 - Engraving or printing machine - Google Patents

Abstract

The printing machine has a rotatable cylindrical support body (4) with an interchangeable elastically extending sleeve. The support cylinder can be moved axially relative to the machine bed (1) and after axial movement about a distance the one end of the support cylinder can be removed from its bearing and then swivelled about an angle. Separate drives can be provided for the axial movement and the angular movement.

Description

The invention relates to an engraving or printing machine, with a rotatable cylindrical support body on which an exchangeable outer form or pressure sleeve Made of elastic, stretchy material that can be opened and closed Pulling off onto or from the carrier body by introduction of compressed air between the carrier body or one on the Carrier body pushed on intermediate sleeve (bridging sleeve) and the form or pressure sleeve is radially expandable, and with a device through which the carrier body relative to Machine bed is movable in the axial direction.

In known engraving machines, on which the later in characters to be transferred during the printing process engraved on the surface of form or pressure sleeves , the exchange of these sleeves on the Carrier body Machine downtimes of 10 - 20 minutes. The machine must be brought to a standstill of the support body and the shape thereon or Existing cylinder detached from its bearings and raised and to one for changing form or Pressure sleeve intended place are spent. Then, after one sleeve is removed and the new sleeve is fitted the cylinder must be transported back to its machine and placed in his bearings and possibly again be calibrated. Because of the generally very high weight the cylinder has to lift and insert and move it away and back to the machine in an elaborate manner with machine help, e.g. done with a crane. Together with the downtimes, this effort represents one represents a high cost factor.

The same applies to printing presses when changing motifs corresponding.

DE 100 23 742 A1 is a printing or form cylinder known for printing presses, optionally on the carrier body both metallic and non-metallic pressure sleeves can be raised. These are in the carrier body a compressed air duct system for winding the non-metallic Pressure sleeves in the manner mentioned above and a hydraulic channel system for winding the metallic Pressure sleeves provided. The loading of both channel systems with their print medium done by each one of the opposite bearings of the support body, at the front ends they open. This too Printing cylinder must, already with the duct systems for that Introduction of the respective print medium become accessible, lifted out of the printing machine to replace the printing sleeves and to another machine on which the exchange of the Sleeves can be made to be transported.

A printing press is known from DE 198 46 033 A1, where the only one-sided pressure cylinder for the Exchange of the pressure sleeve moves axially in its bearing will that one in one between the pressure sleeve and the Carrier body arranged intermediate sleeve provided compressed air channel comes in connection with the outlet opening Compressed air line located on a side of the camp Console emerges and connected to a compressed air connection is. However, this construction is only for short impression cylinders suitable, which are only supported on one side and their other end is freely accessible so that the pressure sleeve can be raised from there.

The object of the invention is an engraving or printing machine of the kind mentioned at the beginning to create one fast and without great time-consuming machine effort to change the form or pressure sleeve straight also permitted on a support body mounted on both sides, so that the necessary machine downtimes become clear be shortened, thus increasing productivity and time and costs can be saved.

According to the invention this is achieved in that after axial movement of the support body by a distance that pulled one end of the support body out of its bearing and is then pivotable through an angle α. Thereby this end of the carrier body becomes freely accessible, and it can be from this side the exchange of form or Pressure sleeve done without the support body the machine and a special exchange device must be transported. The one for the sleeve change necessary standstill is shortened considerably, and the mechanical effort for this is comparatively low and energy saving.

For the axial movement and the angular movement, respectively a separate drive can be provided. In this case it is advantageous if after the end of one movement the subsequent movement is triggered automatically.

According to a preferred embodiment of the invention the carrier body at one end in a fixed Bearing and at its other end in an axial displaceable and pivotable by an angle α Warehouse stock stored.

Preferably after the axial movement of the pivotable Bearing taken up by the distance a with its further axial movement also its pivoting movement by means of a Curve effects. The pivoting movement is thus integral with the axial movement and it is for the two movements only one drive required.

The pivotable bearing holder is preferred on a Console guided in the axial direction by means of an elongated hole and pin, and on the swiveling bearing holder is on the side protruding a first, low extension and at a distance before this, a second, higher extension is provided; there lies in the starting position of the pivotable bearing holder the low extension with its end face on the Guide surface of a circular, arranged on the console Sliding guide element, and after an axial Movement of the pivotable bearing holder by the distance a the higher extension strikes with its lateral contact surface on the circular guide element. This is how it works the further axial movement of the pivotable bearing holder also his swivel movement.

In order to operate the machine after each sleeve change the synchronicity between a tool, e.g. one Laser beam, and to ensure the carrier body advantageous on the side of the pivotable bearing holder an angle pacemaker (encoder) with the axis of the carrier body coupled. The pacemaker is preferred designed as a hollow shaft encoder.

The carrier body is advantageously a cylindrical one Hollow body formed, through holes in the wall are provided; is the cavity of the carrier body after the swivel movement with a rotating union Compressed air can be applied. So the weight of the carrier body be significantly reduced, and manufacturing will simplified by not using special channels for the compressed air be introduced into a carrier body made of solid material have to. If to compensate for different diameters of the formoder Pressure sleeves on the carrier body in a known manner Way, an intermediate sleeve is pushed on, then aligned the holes in the wall of the carrier body with compressed air feedthroughs in the intermediate sleeve.

Fig. 1

schematisch die Draufsicht auf eine Gravier- oder Druckmaschine nach der Erfindung,

Fig. 2

unterbrochen den Längsschnitt durch den Zylinder Einer erfindungsgemäßen Gravier- oder Druckmaschine,

Fig. 3

die Seitenansicht der einen Lageraufnahme einer erfindungsgemäßen Gravier- oder Druckmaschine, teilweise geschnitten und

Fig. 4

die Draufsicht auf die Lageraufnahme gemäß Fig. 3.

The invention is described below in more detail by way of example with reference to the accompanying drawings; show it

Fig. 1

schematically the top view of an engraving or printing machine according to the invention,

Fig. 2

interrupted the longitudinal section through the cylinder of an engraving or printing machine according to the invention,

Fig. 3

the side view of a bearing of an engraving or printing machine according to the invention, partially cut and

Fig. 4

3 shows the top view of the bearing holder according to FIG. 3.

In Fig. 1 is above the machine bed 1 an engraving or Printing machine on both sides in one bearing 2 and 3 mounted support body 4 of a forme or impression cylinder to see. One bearing holder 3 is vertical Swiveling axis; it can be opened move a console axially as well as afterwards pivot by an angle α, so that in the opposite bearing holder 2 slidably mounted Pulled the end of the carrier body 4 out of its bearing and is freely accessible through the pivoting movement, as in Fig. 1 shown with dashed lines.

The carrier body 4 is, as can be seen from FIG. 2, as one-sided closed hollow body formed. On the locked In the end, the carrier body 4 is usually and always during the operation of the machine in a warehouse of the warehouse 2 stored; the open end is in the pivotable Bearing 3 stored. By one not closer shown rotating union in the pivotable Bearing holder 3 can 6 compressed air via a compressed air line be passed into the cavity 5 of the support body 4. The Wall thickness of the support body 4 is dimensioned such that on the one hand it withstands the compressed air safely, on the other hand but also a significant reduction in weight a support body 4 made of solid material, in which, if appropriate only compressed air channels are provided becomes. 2 are in the wall 7 of the support body 4th proceed through holes 8, which are shown in the Example with compressed air feedthroughs 9 in one on the Carrier body 4 pushed on intermediate sleeve 10 (bridging sleeve). On the intermediate sleeve 10 sits here interchangeable form or pressure sleeve 11 from an elastic stretchy material. If compressed air is fed into the cavity 5, so it spreads through the holes 8 and compressed air supplies 9 and generated between the intermediate sleeve 10 and the form or pressure sleeve 11 an air cushion, so that the latter is easy and without great effort pull off and pull up another just as easily leaves. The intermediate sleeve 10 in the example shown can also be replaced and serves different purposes Compensate diameter of the form and pressure sleeves 11. Of course, an appropriately sized one Shaped or pressure sleeve 11 also directly on the carrier body 4th be raised.

For the change of the form or pressure sleeve 11 is after the Invention before the compressed air is introduced, the carrier body 4 by an axial movement and a subsequent one Swiveling movement of the swiveling bearing holder 3 the closed end of the carrier body 4 from its storage pulled out in the fixed bearing holder 2 and then pivoted so far that the now free end is accessible and the sleeve is changed from this side can be.

For moving and pivoting the carrier body 4 A separate drive can be provided in each case be operated electrically, hydraulically or pneumatically can. However, both movements can advantageously be carried out together be started, so that at the end of one Movement automatically initiates the subsequent movement , that is, when the carrier body 4 is pivoted out moving automatically swiveling when swiveling back the sequence is reversed.

According to a preferred one shown in FIGS. 3 and 4 Embodiment is advantageously only one drive required. The pivotable bearing holder 3 is on one Console 12 slidably and rotatably mounted. At the console 12, an adjusting mechanism 13 is provided for this purpose electrically or hydraulically or pneumatically driven can be. For its axial movement, it is pivotable Bearing receptacle 3 on the bracket 12 in an elongated hole 14 guided by pin 15; on a side guide part 16 there is an additional axial guidance. For the In the example, a pivoting movement is provided for curve guidance. For this purpose, the pivotable bearing holder 3 is on its side facing away from the guide element 16 two radially protruding extensions 17, 18 of different heights are attached, and on the console 12 is one with these Extensions 17, 18 interacting, in the example shown circular, guide element 21.

In the normal position of the pivotable bearing holder 3 lies the lower extension 17 with its end face 19 on the Guide element 21; it slides during axial movement the pivotable bearing holder 3 on this guide element 21 along until the one located at a distance a higher extension 18 with its lateral contact surface 20 abuts the guide element 21; in this position is the opposite bearing journal of the carrier body 4 from the bearing in the fixed bearing holder 2 solved. With further axial movement, both slide Extensions 17, 18 with their end face 19 or contact surface 20 on a curved surface 22, the example described here the peripheral surface of the circular guide member 21 is along, whereby with the axial movement and through this also causes the pivoting movement of the pivotable Bearing 3 takes place. When the swivel angle reaches α is, compressed air can be introduced into the cavity 5 and the exchange of the form or pressure sleeve 11, as above described. After that, with the axial movement in the opposite direction, the pivoting movement is first returned and then the support body 4 in its storage in the fixed bearing holder 2 inserted so that the Machine is ready for operation again.

A part with another comes as a guide element 21 as a circularly shaped curved surface 22 in question. Also are other solutions for driving the movements are conceivable, without departing from the invention.

The exchange of the form or pressure sleeves 11 can thus take place on the respective machine itself in a short time and without further mechanical effort in an energy-saving manner; The machine's downtime is reduced to a minimum, which increases production and saves costs.
According to the preferred embodiment described, only a single drive is required for the movement of the carrier body 4 in the axial direction and for its pivoting movement; this considerably reduces the susceptibility to failure of the device and saves energy again. The coupling of the carrier body 4 on the side of the fixed bearing receptacle 2 after each sleeve change can be done by frictional engagement, frictional engagement, by means of teeth, via a slip clutch or magnetically. In any case, slippage of the carrier body 4 or its bearing journal in the fixed bearing seat 2 must be avoided during the operation of the machine. In an engraving machine, for example, it must be ensured that the engraving tool, for example a laser beam, is always in absolute synchronicity with the rotation of the carrier body 4 on which the shaped or pressure sleeve 11 to be engraved is located. The same applies to the forme cylinder and the impression cylinder of a printing press. In order to be able to monitor this synchronicity, an encoder or angular step encoder 23 is used, which is designed here as a hollow shaft encoder and is coupled to the axis of the carrier body 4 on the side of the pivotable bearing receptacle 3, where the carrier body 4 with its journal is always in the bearing ,

LIST OF REFERENCE NUMBERS

1

machine bed

2

fixed inventory

3

swiveling inventory

4

support body

5

cavity

6

Compressed air line

7

wall

8th

drilling

9

Compressed air bushings

10

intermediate sleeve

11

Form or pressure sleeve

12

console

13

mechanism

14

Long hole

15

pen

16

guide part

17

lower extension

18

higher extension

19

face

20

contact surface

21

guide element

22

cam surface

23

Encoder / angle encoder

Claims (10)

1. Engraving machine or printing press, having a rotatable cylindrical carrier (4) on which an exchangeable outer forme or printing sleeve (11) made from elastically expandable material is seated which, for pulling onto or off the carrier (4), can be expanded radially by introducing compressed air between the carrier (4) or a bridging sleeve (10) pushed onto the carrier and the forme or printing sleeve (11), and having an apparatus by means of which it is possible to move the carrier (4) relative to the machine bed (1) in the axial direction, characterized in that, after the axial movement of the carrier (4) by a distance (a), the one end of the carrier (4) is pulled out of its bearing and can subsequently be pivoted through an angle (α).
2. Engraving machine or printing press according to Claim 1, characterized in that in each case a separate drive is provided for the axial movement and the angular movement.
3. Engraving machine or printing press according to Claim 2, characterized in that, after the end of one movement, it is possible for the subsequent movement to be initiated automatically.
4. Engraving machine or printing press according to Claim 1, characterized in that the carrier (4) is mounted at one end in a stationary bearing seat (2) and at its other end in a bearing seat (3) which is axially displaceable and can be pivoted through an angle (α).
5. Engraving machine or printing press according to Claim 4, characterized in that, after the axial movement of the pivotable bearing seat (3) by the distance (a), it is also possible to perform its pivoting movement with its further axial movement by means of cam guidance.
6. Engraving machine or printing press according to Claim 4, characterized in that the pivotable bearing seat (3) is guided on a bracket (12) in the axial direction by means of a slot (14) and pin (15) and, protruding laterally on the pivotable bearing seat (3), a low projection (17) is provided and, at a distance in front of the latter, a higher projection (18) is provided, the end face (19) of the low projection (17) being in sliding contact, in the initial position of the pivotable bearing seat (3), with the circumferential surface (22) of a circular guide element (21) arranged on the bracket (12) and the lateral bearing surface (20) of the higher projection (18) striking the guide element (21) after an axial movement of the pivotable bearing seat (3) by the distance (a).
7. Engraving machine or printing press according to Claim 4, characterized in that a rotary encoder (23) is coupled to the axle of the carrier (4) on the side of the pivotable bearing seat (3).
8. Engraving machine or printing press according to Claim 7, characterized in that the rotary encoder (23) is designed as a hollow-shaft encoder.
9. Engraving machine or printing press according to Claim 1, characterized in that the carrier (4) is designed as a cylindrical hollow body, in whose wall (7) through holes (8) are provided, and in that it is possible to supply compressed air through a rotary leadthrough to the cavity (5) of the carrier (4) after its pivoting movement.
10. Engraving machine or printing press according to Claim 9, characterized in that the holes (8) in the wall (7) of the carrier (4) are aligned with compressed-air leadthroughs (9) in a bridging sleeve (10) pushed onto the carrier (4).

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