EP1155829B1 - Exchangeable cylinder element in an electrographic printing unit - Google Patents

Abstract

The cylinder has two ends (2,25) supporting a sleeve (3) accommodating a functional coating (23). The ends are mounted on a bearer body (1) passing through the cylinder. The sleeve accommodating the functional coating can be centered with respect to the rotation axis with centering surfaces on the ends, whereby at least one end can be released with respect to the bearer body. Independent claims are also included for the following: (1) a printing mechanism; (2) a printing machine.

Description

The invention relates to replaceable cylinder elements to electrographic for printing web-like or sheet-shaped material serving printing units.

From DE 37 05 477 C1, a holding device for applying a sleeve to a cylinder has become known. For applying a sleeve through an opening in a printing unit side wall, on the outside of the other printing unit side wall of the cylinder on the extended journal of the cylinder, an eccentrically mounted auxiliary shaft disposed above this transversely positioned in a gear box. By adjusting nuts, the auxiliary shaft and thus the journals of the cylinder is horizontally adjusted and lockable. In this arrangement, a sleeve is pushed laterally through an opening in the printing unit side wall on the solid-trained printing cylinder of a printing unit of a rotary printing press.

DE 40 36 387 A1 and DE 40 36 388 A1, respectively, show bearings for printing cylinder in rotary printing machines. From the first-mentioned publication a storage for a printing cylinder of a web-fed rotary printing press with a replaceable, axially removable from the cylinder jacket is known. An auxiliary device which supports the cylinder on one side when changing shells is intended to lock it comprehensively, but does not impair it during printing operation and does not touch it. For this purpose, according to DE 40 36 387 A1 outside and / or inside of the pin in the shell change still overlapping machine side wall on the pin depending on the cylinder supporting role with concave lateral surface adjustable, which is arranged in a arranged on the machine frame, pivoting in the longitudinal direction of the pin lever.

DE 40 36 388 A1 represents an alternative solution, wherein outside of and / or within the journal of the cylinder overlapping machine side wall to the pin each a cylinder supporting lever is adjustable, the rotatable in the frame can be stored, lying perpendicular to the support surface next to the pin lying an eccentric and is connected by means of a four-bar link with another mounted on the other side of the pin in the frame eccentric. This solution, which involves a rather complex mechanism, relates to printing units of web-fed rotary printing presses with which massively executed cylinders are supported in the printing unit during the sleeve change.

DE 40 36 390 A1 and DE 40 36 391 A1 each relate to bearings for printing cylinder in web-fed rotary printing presses.

DE 40 36 390 A1 discloses a cylinder of a web-fed rotary printing press during the cylinder winding change unilaterally supporting auxiliary device which locks the cylinder, it does not touch in the printing operation. For this purpose, a centering piece is arranged centrally in the machine frame or slidable into the pin in the machine frame, mounted centrally in the machine side wall and protruding from the latter.

DE 40 36 391 A1 also relates to a holding device for a printing cylinder during the period of time at which a shell change is performed on this. According to the solution of DE 40 36 391 A1 is outside and / or within the journal of the cylinder overlapping machine side wall slidably arranged in the frame, the pin supporting and in a recess partially comprehensive carriage by means of an eccentric to the pin hire.

US 4,119,032, also discloses a holding device for a cylinder, which undergoes a coat change in the printing unit of a printing machine installed state. For this purpose, a pin of the solid cylinder, which is mounted in the side walls of the printing press, exposed by removal of a portion of the side wall, while the other drive side provided cylinder pin is enclosed by a yoke, so that the cylinder remaining in the printing unit is protected against tipping and the jacket of the cylinder can be replaced.

EP 0 575 739 B2 relates to a device for supporting a cylinder in a rotary printing machine with a frame with side walls spaced apart from one another. Therein, a pressure cylinder is provided with a support member for supporting the ends of the impression cylinder in the side walls. The support member is removable from the one end of the impression cylinder, wherein a counterweight mechanism is provided with an adjustable in position rotary arm, which exerts force in a support position on the other end of the impression cylinder to support this during removal of the support member in the frame. A hinge piece for moving the rotary arm into the position supporting the cylinder and for holding the rotary arm in this position against the weight of the impression cylinder has an end position for its mobility for adjusting the rotary arm. Due to the end position, a surprising or sudden pressure drop in the holding system can be prevented and the cylinder can be kept in its position in the printing unit of the rotation even with pressure drop in the hydraulic system of the holding device.

US 5,215,013, refers to a recorded in a printing unit of a web-processing rotary printing cylinder, on which a sleeve-shaped transmission sleeve is pushed. For this purpose, the sleeve is expanded before being pushed onto the jacket of the cylinder located in the printing press, supported on one side by means of compressed air, so that the sleeve can be pushed laterally onto the jacket. The air flowing out of the air cushion laterally causes a high-frequency noise, which is damped by a sunken in the sleeve aufzuschiebenden damping ring.

From US 5,649,267 a method for arranging a drum assembly is known, wherein the drum can be used in a printing unit. On the peripheral surface of the drum, which is used as an endless rotating surface, a toner image may be arranged. The drum assembly comprises a hollow drum having an opening at each end and a Surface to which the toner image can be applied. A support surface which contains an opening in its interior is, before being inserted into the drum surface at its ends, cooled and thus shrunk into the open ends of the lateral surface of the drum. When heating the previously cooled disc-shaped elements, this expands and thus produce between the lateral surface and the end faces a press fit. In addition, openings are provided in the end faces in which a carrier supporting the drum can be received. In the solution according to US Pat. No. 5,649,267, there is the disadvantage that, in order to renew the functional layer on the jacket surface of the cylinder, the entire assembly has to be exchanged, since the end faces of the drum arrangement have shrunk into the arrangement forming the lateral surface. Cooling within the machine to disassemble the end faces around the drum assembly in the machine is highly complex and cumbersome.

US-A-5 038 172 discloses a cylinder according to the preamble of claim 1.

In cylinder arrangements with photoelectric functional surfaces-adjusting wear, for example, by removal of particles from the surface, occurs over the life of the photoelectric layer depending on the stress inevitably and is a technical problem.

In view of the solutions known from the prior art which relate primarily to one-sided support of solid cylinders to web-fed rotary printing presses, the invention has for its object to simplify the replacement of a functional layer, such as a photoelectric layer on a cylinder of a printing unit and with minimal effort within to perform the printing unit.

According to the invention the object is achieved with a cylinder according to claim 1.

The advantages associated with the proposed solution according to the invention are, above all, that a cylinder arrangement formed in this way can be removed laterally from the printing unit after exposing an opening in a side wall supporting the cylinder arrangement. After releasing an end face with centering surfaces from the carrier body, the worn lateral surface can be replaced by a remanufactured or even a new photoelectric functional layer, for example, wherein the end faces receiving the centering surfaces and the carrier body passing through the cylinder arrangement can be reused together with rolling bearings received thereon. With the solution according to the invention, especially the economic advantage is that not the entire cylinder is exchanged, since the centering releasable connections between the end faces and the functional surfaces bearing cylinder sleeve, in contrast to itself by shrink joints forming press carcasses, which are difficult to solve are.

The solution according to the invention can preferably be used in a printing unit of a printing unit, which is used for short runs with rapidly changing subjects, such as those printing units, on the cylinder jacket surfaces toner images are applied, for example Photoelectric functional layers, which are subject to a principle-related wear.

Reference to the drawings, the invention will be explained in more detail below.

Fig. 1

eine Zylinderanordnung mit Stirnseiten aufnehmendem Trägerkörper in Gestalt einer Achse und einer an den Stirnseiten zentrierten, eine die Funktionsschicht des Zylinders aufnehmenden Hülse,

Fig. 2

die Zylinderanordnung gemäß Fig. 1, gelagert in Seitenwänden einer Druckeinheit, wobei eine Stirnseite der Zylinderanordnung freilegbar ist.

It shows :

Fig. 1

a cylinder arrangement with end faces receiving carrier body in the form of an axis and a centered on the end faces, a functional layer of the cylinder receiving sleeve,

Fig. 2

the cylinder assembly of FIG. 1, mounted in side walls of a printing unit, wherein an end face of the cylinder assembly is exposed.

From the illustration according to FIG. 1, a cylinder arrangement with a front-side receiving carrier body and a sleeve centered on the end sides and showing the functional layer of the cylinder is shown.

The cylinder shown in FIG. 1 essentially comprises a carrier body 1 passing through the cylinder cavity, and two end faces 2 and 5, respectively, which are accommodated on seat surfaces and which are designed as centering flanges. A cylindrical sleeve 3 is received on the centering surfaces provided in the direction of rotation on the centering flanges 2, 5, on the upper side of which a functional layer 23 is formed, which may be a photoelectric layer in electrographically operating printing units. This layer is subject to unavoidable wear during the printing process and must therefore be replaced. In order to accomplish this exchange simply cost-effective, the sleeve 3, the outer surface of which carries the functional layer 3, 2 and 5 positively received on the centering of the Zentrierflanscher and can be removed from these after mounting the Zentrierflansches 5 again.

The centering flanges 2 and 5 are received on the circumference of the carrier body 1. The centering flange 2 is shown in Fig. 1 embodiment secured by a retaining ring 14 on its seat on the support body 1 and is supported with its hub on a collar of the support body 1 and is thus fixed in the axial direction. In contrast, the centering flange 5 is secured to its seat surface via a groove nut 18. The nut 18 acts on an annularly configured pressure body 24 and moves it in the axial direction, according to the pitch of the cooperating with the nut 18 thread 19 adjacent to the bearing pair 20. The annular pressure body 24 acts on a deformable in the circumferential direction radially expanding sleeve 24.1 with which the centering flange 5, which can be removed from the circumference of the carrier body 1, is fixed on its seating surface. The clamping device 9 formed by the deformable sleeve 24.1 below the Zentrierflansches 5 allows exact axial positioning of the Zentrierflansches 5 relative to the carrier body 1, so that the eccentricity or the circumferential position of the cylinder sleeve 3 with functional layer 23 can be aligned relative to the axis of rotation 8 of the carrier body 1 ,

In addition to the centering flange 2 fixed to the carrier body 1 in a stationary position, a bearing accommodated on the bearing seat 16 of the pin 17 is shown, which is identified by reference numeral 15.

At the opposite end of the cylinder assembly of FIG. 1, a bearing pin 22 is formed, which receives a received on a seat surface 21 bearing pair 20. The bearing pair 20 is supported on the outlet of the thread 19, on which the groove nut 18 is rotatable, which in turn biases the pressure body 24. Due to the circumferential position of the groove nut 18 on the Nutmuttergewinde 19, the bias of the deformable sleeve 24.1 below the Zentrierflansches 5 on the carrier body 1 can be preset.

From the illustration in FIG. 2, a cylinder arrangement according to FIG. 1 is shown, which is mounted in frame walls of the printing unit.

At the Zentrierflanschen 2 and 5, which are either axially fixed or added relatively positioned on the circumference of the support body 1, are as Chamfers executed centering surfaces formed. On the centering surfaces of the Zentrierflansche 2 and 5 preferably formed as chamfers, the functional layer 23 receiving cylinder sleeve 3 is non-positively, but releasably attached. In the illustration according to FIG. 2, a seat surface 16 is formed on the pin 17 of the cylinder arrangement, on which a bearing 15 designed here as a pair of bearings is arranged. This is supported in a storage opening in the frame part 10 of the printing unit. The centering flange 2 is secured on the circumference of the carrier body 1 in the axial position by a securing ring 14, so that an axial position with respect to the circumference of the carrier body 1 is fixed.

On the opposite pin 22 of the cylinder assembly of FIG. 2, a thread 19 is analogous to the representation of FIG. 1 executed, on which a groove nut 18 is rotatably arranged, which exerts an axial force on a pressure body 24. The axial force of the pressure body 24, applied by the groove nut 18, is transmitted to a deformable sleeve 24.1 whose deformation in the radial direction ensures tensioning of the sleeve-shaped centering flange 25, which is thus positionable on its seating surface ,

In contrast to the illustration in Fig. 1, the centering flange 5 is formed as a sleeve-shaped centering flange 25, which in addition to a seat of the support body 1 cross-section also has a groove nut 18 and the thread 19 cross section. At the end of this section of the sleeve-shaped centering flange 25, a rolling bearing 12 is accommodated, which is supported on the wall 28 of a bore 27 in the fastening element 13. The fastener 13 in turn is provided with a circumferential collar 29, with which it is supported on the frame part 11 of the printing unit and, for example, via fittings which are arranged regularly on the circumference of the collar 29, in the frame part 11 can be fastened.

A removal of the cylinder assembly of FIG. 2 from the printing unit is as follows: After release of the connection between the frame part 11 and fastener 13, for example by loosening screw, is the fastener 13, in the axial direction of the cylinder pin 22 sweeping, removed from the printing unit. At the same time, the carrier body 1 is fixed in its position in the printing unit at the opposite end, so that the orientation of the axis of rotation 8 of the carrier body 1 remains substantially unchanged. Then can be achieved by loosening the nut 18, a repeal of the tensioning action of the clamping device 9; the groove nut 18 moves outward, the pressure body 24 is relieved and the previously deformed by the pressure body 24 sleeve 24.1 relaxed. By relaxing the deformable sleeve 24.1 by relieving the pressure body 24 after loosening the nut 18 of the sleeve-shaped centering flange 25 on the carrier body 1 is releasable. On the other hand, after removal of the fastener 13 from the frame side 11, the cylinder assembly shown in FIG. 2, consisting of carrier body 1, axially fixed centering 2 and releasably positioned sleeve-shaped centering flange 25 are taken with their recorded on centering cylinder sleeve 3 in toto from the printing unit. Thereafter, the just-shown loosening of the groove nut 18 and the removal of the sleeve-shaped centering flange 25 carried by the carrier body 1. After removal of the sleeve-shaped centering flange 25 from the periphery of the seat of the carrier body 1, the worn functional layer 23 having cylinder sleeve 3 can be removed and replaced by a refurbished, for example, photoelectric properties functional layer, or replaced by a new cylinder sleeve which is still unused Functional layer 23 having photoelectric properties, to be replaced. Parts that are subject to limited wear, such as the Zentrierflansche 2 and 25, and the support body 1 can be quite reused in the cylinder arrangement proposed in FIG.

The design of the centering surfaces configured as bevels on the centering flanges 2 and 25, which have an opposing chamfer, makes it possible to influence the axial position of the functional layer 23 formed on the cylinder sleeve 3. Furthermore, can be positioned by means of the relative to the carrier body 1 in the axial direction positionable centering flange 25 an eccentricity the functional surface 23 relative to the axis of rotation 8 of the Zentrierflansche 2 and 5 and 25 receiving carrier body 1 set.

The proposed solution according to the invention allows in a simple manner a cost exchange of a worn or highly stressed functional surface 23, which may be applied, for example, to one made of aluminum or another material - even a plastic material would be conceivable. The degree of overlap of the bevels formed on the cylinder sleeve 3 complementary to the centering of the Zentrierflansche 2 and 5 can also be less than 100% and in the context of assembly of the cylinder assembly of FIG. 2 in the positioning of the cylinder sleeve 3 on the centering of the Zentrierflanscher 2, 5 or 25 can be preset. Depending on the course of the bevel of the centering surfaces on the peripheral surfaces of the end faces of the Zentrierflansche 2, 5 and 25, a limited influence on the surface development of the cylinder assembly of FIG. 2 is possible.

It should not go unmentioned that with the arrangement shown in Fig. 2, a replacement of the functional surface 23 receiving cylinder sleeve 3 can be done both within a printing unit and outside of such. After exposure of the frame side 11, by removing the fastener 13 from the frame side 11 and a successful printing in the release nut nut 18, the sleeve-shaped centering flange 25 can also remain in the printing unit remaining support body 1 in the axial direction through the resulting opening in the frame side 11 are removed. Thereafter, the cylinder sleeve 3 accommodating the functional layer 23 is simply pulled laterally out of the printing unit from the opening formed by removal of the fastener 13. A suitably supported support body 1 may remain on the bearing pair 15 on the frame side 10 in the bearing, as well as the axially fixed centering flange 2 received on its peripheral surface.

LIST OF REFERENCE NUMBERS

1

support body

2

centering

3

cylinder sleeve

4

pressure vessels

5

centering

6

centering

7

complementary centering surface

8th

axis of rotation

9

tensioning device

10

frame part

11

frame part

12

support bearings

13

fastener

14

circlip

15

camp

16

bearing seat

17

spigot

18

locknut

19

Nutmuttergewinde

20

bearing pair

21

seat

22

spigot

23

functional area

24

pressure vessels

24.1

deformable sleeve

25

centering

26

camp

27

drilling

28

bore

29

Covenant of the fastening element

Claims (1)

1. Cylinder having a functional surface (23) for rotation about a rotational axis (8), said cylinder also having a support body (1) provided with two faces (2; 5, 25) supporting the shell (3) which accommodates the functional surface (23) in such a manner that the shell (3) accommodating the functional surface (23) is centered relative to the rotational axis (8) by means of rotating centering surfaces (6, 7) formed on the faces (2; 5, 25), the centering surfaces (6, 7) forming releasable connections between the faces (2; 5, 25) and the shell (3) in that the centering surfaces (7) on the shell (3) and the centering surfaces (6) on the faces (2; 5, 25) are designed as complementary bezels, with one of the faces (2; 5, 25) being movable in axial direction on the support body (1) relative to the other face (2; 5, 25), and the axially movable face (5, 25) being provided with a tensioning arrangement (9) and the support body (1) itself being supported in the support elements (10, 11, 13) of a frame (10, 11),
   characterized in that
   the tensioning arrangement (9) comprises a shell (24.1) which deforms in radial direction via a pressure element (4, 24) which can be pretensioned in axial direction, and in that the face (5, 25), which can be pretensioned at its seat surface on the support body (1) relative to the other face (2), is configured as a shell enclosing the support body (1) and a support pin (22), and in that the cylinder's face (5, 25), which is configured as a shell, acts as the bearing element for the support body (1).

Images