PRINTING ROLLER AND METHOD FOR MOUNTING A PRINTING ROLLER

Abstract

A printing roller comprises a base body which has mounting segments, a printing and a clamping mechanism which has a clamping bushing, which can be displaced in the axial direction, and with respect to the clamping bushing, has a proximal and a distal clamping element which are arranged to detachably clamp the printing sleeve to the base body by means of the radial clamping force in each case, wherein a compression force transmission chain is formed between the clamping bushing and the proximal and the distal clamping elements, by means of which, during an initial clamping phase, the compression force, generated by the clamping bushing is transmitted predominantly or entirely to the distal clamping while the compression force generated by the clamping bushing is applied to the proximal clamping element to a lesser extent than to the distal clamping element or not at all.

Claims

1. A printing roller (1), comprising: a base body (2), comprising mounting segments (3, 4); a printing sleeve (5), which is arranged on the base body (2); and a clamping mechanism (6), comprising a clamping bushing (7) that can be displaced in an axial direction on the base body (2), and a proximal and a distal clamping element (8, 9) under the action of the clamping bushing (7), which are configured, upon application of a compression force generated by means of the clamping bushing (7) onto the proximal and distal clamping elements (8, 9), to clamp the printing sleeve (5) detachably onto the base body (2) by means of respective radial clamping forces; wherein a compression force transmission chain is formed between the clamping bushing (7) and the proximal and distal clamping elements (8, 9), in which, when fixing the printing sleeve (5) onto the base body (2) in an initial clamping phase, the compression force generated by the clamping bushing (7) is predominantly or entirely transmitted onto the distal clamping element (9), so that the radial clamping force develops on the distal clamping element (9), while the compression force generated by the clamping bushing (7) that is applied to the proximal clamping element (8), is less than or zero compared with the compression force applied to the distal clamping element (9).

2. The printing roller in accordance with claim 1, wherein the compression force transmission chain is designed as a mechanical transmission chain.

3. The printing roller in accordance with claim 1, wherein at least one of the proximal and the distal clamping elements (8, 9) comprises an expansion element (8a, 9a).

4. The printing roller in accordance claim 1, wherein the compression force transmission chain has a protective element (10), which is constituted so as to reduce, or to prevent entirely, the application of force onto the proximal clamping element (8) with the compression force generated by the clamping bushing (7) in the initial clamping phase, in that the protective element (10) provides a counterforce to the generated compression force.

5. The printing roller in accordance with claim 4, wherein the protective element (10) has a pre-load element, which partially or entirely pre-loads the clamping bushing (7) against any transmission of the compression force generated by the clamping bushing (7) onto the proximal clamping element (8) in the initial clamping phase.

6. The printing roller in accordance with claim 4, wherein the protective element (10) is constituted so as to move with the clamping bushing (7) during the axial displacement of the clamping bushing (7).

7. The printing roller in accordance with claim 4, wherein the protective element (10) is arranged on the printing sleeve (5) such that the protective element (10) can be separated, together with the printing sleeve (5), from the base body (2).

8. The printing roller in accordance with claim 1, wherein the compression force transmission chain, including the printing sleeve (5), is formed such that the compression force generated by the clamping bushing (7) is transmitted via the printing sleeve (5) onto at least one of the proximal and the distal clamping element (8, 9).

9. The printing roller in accordance with claim 1, wherein at least on of the proximal and distal clamping elements (8, 9) is arranged in an assigned recess on the base body (2).

10. The printing roller in accordance with claim 1, wherein the proximal and distal clamping elements (8, 9) are arranged in a radial direction at different distances from a central axis of the base body.

11. A method for mounting a printing roller (1), wherein the method has the following steps: providing a base body (2), which has mounting segments (3, 4), arranging a printing sleeve (5) onto the base body (2), and clamping of the printing sleeve (5) onto the base body (2) by means of a clamping mechanism (6), which has a clamping bushing (7) that is arranged on the base body (2) and can be displaced in an axial direction, together with a proximal and a distal clamping element (8, 9) under the action of the clamping bushing (7), wherein hereby: a compression force is generated by means of axial displacement of the clamping bushing (7) and is introduced onto the proximal and the distal clamping elements (8, 9) via a compression force transmission chain, which is formed between the clamping bushing (7) and the proximal and distal clamping elements (8, 9), and the proximal and distal clamping elements (8, 9) thereupon detachably clamp the printing sleeve (5) onto the base body (2) by means of respective radial clamping forces, wherein the compression force transmission chain, when clamping the printing sleeve (5) onto the base body (2) in an initial clamping phase, transmits the compression force generated by the clamping bushing (7) predominantly or entirely onto the distal clamping element (9), so that the radial clamping force is developed on the distal clamping element (9), while the force generated by the clamping bushing (7) that is applied to the proximal clamping element (8), is less than or zero compared with the force applied to the distal clamping element (9).

12. The method in accordance with claim 11, wherein the clamping bushing (7) and the proximal clamping element (8) are spaced apart from one another during the initial clamping phase.

13. The method in accordance with claim 11, wherein a mechanical element of the compression force transmission chain during the initial clamping phase is at least temporarily displaced relative to the proximal clamping element (8), and in a later clamping phase, by virtue of the radial clamping force then occurring on the proximal clamping element (8), is clamped, and thereby fixed relative to the proximal clamping element (8).

Description

DESCRIPTION OF EMBODIMENTS

[0030] Following, further embodiments are described with reference to the figures. Here:

[0031] FIG. 1 shows a schematic representation of a printing roller in cross-section;

[0032] FIG. 2 shows a schematic representation of a further printing roller in cross-section; and

[0033] FIG. 3 shows a schematic representation of a clamping bushing with an integrated force introduction element for a printing roller.

[0034] FIG. 1 shows a schematic representation of a printing roller 1, in particular a printing roller for flexographic printing. The printing roller 1 has a base body 2, on which are formed mounting segments 3, 4 at its ends. On the base body 2, designed in the form of a support bar, a printing sleeve 5 is detachably and replaceably clamped with the aid of a clamping mechanism 6.

[0035] The printing sleeve 5 can be a sleeve, or a combination of a sleeve and an adapter, on which the sleeve is arranged. In the event that an adapter is used, the (outer) sleeve is arranged on the adapter on the printing sleeve 5, and the combination of sleeve and adapter forming the printing sleeve 5 is clamped onto the base body 2.

[0036] In the form of embodiment represented the clamping mechanism 6 has a clamping bushing 7, which is arranged such that it can be screwed onto the base body 2. By means of rotation (screwing action) the clamping bushing 7 can be displaced in the axial direction of the base body 2. The printing sleeve 5 serves to provide a compression force, which in the course of clamping the printing sleeve 5 onto the base body is transmitted onto a proximal clamping element 8 and a distal clamping element 9. FIG. 1 shows an unclamped initial state, in which the clamping bushing 7 is arranged spaced apart from the proximal clamping element 8. If the clamping bushing 7, by means of a screwing movement, is now moved in the axial direction towards the proximal clamping element 8, in an initial clamping phase the compression force provided by the clamping bushing 7 is transmitted via a protective element 10, which in the form of embodiment represented is embodied as a plate spring, and via an end face 11 of the printing sleeve 5, onto the latter. In turn the printing sleeve 5 couples mechanically, via a transmission element 12, onto the distal clamping element 9. The distal clamping element 9 is formed with a distal expansion element 9a, which, by virtue of the (lateral) application of pressure via the transmission element 12, is subjected to a deformation effect, which leads to the expansion of the expansion element 9a in the radial direction, so that the expansion element 9a presses against an inner surface 12a of the transmission element 12, and by this means against the printing sleeve 5. The deformation effect of the expansion element 9a takes place because, with the application of pressure, the expansion element 9a is pushed against a collar 13, and thus cannot escape the compression force. Instead the radial clamping force is generated for purposes of detachable clamping of the printing sleeve 5 onto the base support 2 in the region of the distal clamping element 9.

[0037] If the clamping bushing 7 moves further in the direction of the proximal clamping element 8, which is formed with a proximal expansion element 8a, the clamping bushing 7 thus finally comes into contact with the proximal clamping element 8, and applies a compression force onto the latter, which leads to an expansion of the proximal expansion element 8a in the radial direction, so that the printing sleeve 5 is finally also clamped in the region of the proximal clamping element 8 onto the base support 2.

[0038] FIG. 2 shows a schematic representation of a further printing roller, in which a detachable clamping action is provided in a comparable manner between the base body 2 and the printing sleeve 5. In contrast to the form of embodiment in FIG. 1, the compression force transmission chain in the configuration in FIG. 2 is formed with a transmission bushing 14, which for its part then presses onto the distal clamping element 9, as a result of which the expansion of the assigned expansion element 9a takes place. FIG. 2 also shows the printing roller in an initial clamping phase, in which the clamping bushing 7 is not in contact with the proximal clamping element 8.

[0039] FIG. 3 shows a schematic representation of a clamping bushing 7 with an integrated force introduction element 10, by which the clamping or releasing of the pressure sleeve 5 is accelerated since the clamping bushing with the force introduction element can be assembled or disassembled as one module onto the base body 2.

[0040] The features disclosed in the above description, the claims, and the figures, can be of significance, both individually and also in any combination, for the implementation of the various embodiments.