Roller lock for a printing press

Abstract

Roller lock (5) for a printing press (1), comprising a hold-down device (29) which radially secures a roller (4) in the roller lock (5) in a closed position, wherein the hold-down device (29) is loaded by a first spring (24), is mounted so as to be rotatable about an imaginary axis of rotation (17) into the closed position and can be locked in the closed position by a bolt (33), wherein the bolt (33) is loaded by a second spring (27), characterized by that when unlocking the bolt (33) is adjustable relative to the hold-down device (29) and along the imaginary axis of rotation (17).

Description

A roller lock corresponding to this preamble is described in DE 101 11 068 A1.Further prior art is described in DE 101 52 467 A1.In printing presses with anilox inking units-such as the printing press described in U.S. Pat. No. 7,607,390 B2-screen rollers are used for ink metering.Intermediate rollers can be adjustable on the screen roller, for example for cleaning purposes, as described in DE 10 2007 001 948 A1. The intermediate rollers described therein are mounted in roller locks which comprise a hold-down device.Such a roller lock is also described in DE 42 43 657 A1. This document describes that, by means of a corresponding configuration between the hold-down device and a bearing body, latching of the hold-down device can be achieved when the roll lock is closed.Locking of the hold-down device can also be achieved in another manner. Two variants are described for this purpose in EP 0 734 857 B1. In one variant, the hold-down device is provided with a prism guide and in the other variant, a ball catch is present.It is disadvantageous in the prior art that one and the same component in the functional unit functions as a hold-down device and as a latch. In order for this component to be able to fulfil its function as a holding-down device and to securely clamp the roller, the spring load of the component must be great. Only a large spring force ensures that the roller is pressed sufficiently strongly into the roller lock and is held firmly therein. However, the large spring load makes it difficult for the operator to unlock, which takes place against the action of the spring force. Thus, the component only insufficiently performs its function as a latch.The object of the invention is to provide a roller lock which both securely holds the roller and is easily operated.This object is achieved by a roller lock having the features of claim 1.In the case of the roller lock according to the invention, the functional unit present in the prior art is canceled and the hold-down device and the latch are two components which are different from one another. By the presence of second different springs, one can be designed to securely hold the roller firmly via the hold-down device and the other can be designed to ensure easy operability of the bolt during unlocking.Advantageous refinements are mentioned in the dependent claims, which are briefly explained below.In a development which is advantageous with regard to the pivoting of the holding-down device into the closed position, the holding-down device and the latch are connected to one another in a rotationally fixed manner, with the result that, when the latch is rotated about the imaginary axis of rotation about the latter, the holding-down device is positively rotated with it.In a further development which is advantageous with regard to releasing the locking, the adjustment of the bolt relative to the holding-down device serving for unlocking can take place counter to the action of the second spring.In a further development which is advantageous with regard to a different-magnitude spring load of the holding-down device and of the latch, the spring force exerted by the first spring on the holding-down device is greater than the spring force exerted by the second spring on the latch. Due to the greater spring load of the hold-down device, the latter holds the roller securely in the roller lock and due to the smaller spring load of the latch, the latter can be easily released by the operator. The loading directions of the hold-down device and of the latch can each be determined by the line of action of the corresponding spring force or a component of this spring force. In the present case, loads in the same direction are understood to mean lines of action and directions of action which are truly parallel to one another, but not anti-parallel to one another, and lines of action and directions of action which are identical to one another, are in the same direction, but not in the opposite direction, of the loads of the two components as a result of the spring forces.In further developments advantageous with regard to a coaxial arrangement of the hold-down device and the latch, a pin is rotatably mounted about the imaginary axis of rotation. The pin thus forms the hinge pin of a swivel joint. A first bushing and / or a second bushing is seated on the pin in a rotationally fixed and displaceable manner. The hold-down device is arranged on the first bushing and the latch is arranged on the second bushing. The rotationally fixed connection of the first bushing to the journal and the rotationally fixed connection of the second bushing to the journal can each be realized by a shaft-hub connection or a cross pin. The axial displacement of the first bushing along the pin and the axial displacement of the second bushing along the pin can each be realized by an elongated hole or a groove or a similar sliding joint via which the respective bushing is connected to the pin.In a development which is advantageous with regard to reducing or eliminating the axial play of the roller during the closing of the roller lock, a cam is formed on the first bushing. The cam can be realized by an eccentric design or mounting of the first bushing. The cam is rotatable about the imaginary axis of rotation together with the pin and thus together with the latch and the hold-down device, which are connected to one another in a rotationally fixed manner. By rotating the cam, it can be adjusted selectively towards and away from the roller located in the roller lock. In the closure position, in which the hold-down device is locked by the latch, the cam is adjusted toward the roller in order to fix or secure it axially by abutting against its roller journal on the end face.In a development which is advantageous with regard to the functional separation of the hold-down device and the bolt from one another, the bolt, when it is in the locking position, engages in a component of the roller lock. In this case, the latch therefore does not engage in the roller journal of the roller and also does not engage in a rotary bearing which may be seated on the roller journal. In the present context, "engaging" is understood to mean a form-fitting engagement, engaging behind or the like, whereby the locking or locking is effected.In a further development which is advantageous with regard to securing an outer ring of the rotary bearing against rotation, the rotary bearing which is seated on the roller journal has a polygonal circumferential contour or a supporting ring which is seated on the rotary bearing has a polygonal circumferential contour. When the hold-down device is in the closed position, it presses on a flattened portion of the polygonal circumferential contour. The polygonal circumferential contour can be e.g. quadrangular or hexagonal, wherein the outer ring or the support ring has outer surfaces arranged quadrangular or hexagonally. The rotary bearing may be a rolling bearing including an inner ring and the aforementioned outer ring, and the support ring may be pressed onto the outer ring of the rolling bearing so as to be seated thereon.The invention also includes a printing machine having an anilox or screen roller and a roller lock designed according to the invention or one of the developments, for receiving a roller, which is mounted so as to be selectively adjustable and deposable on and from the anilox or screen roller. The roller can be adjustable to the anilox or engraved roller, for example, for cleaning the thereof. When the roller is set, it can be adjusted together with the roller lock towards the screen roller, for which purpose the roller lock is adjustably mounted.Further structurally and functionally advantageous refinements emerge from the following description of a preferred exemplary embodiment and the associated drawing.In this figure: FIG. 1 shows a roller lock with a roller secured therein, FIG. 2 shows the roller lock from FIG. 1 from another perspective and without the roller, FIG. 3 is a sectional view of the roller lock, FIG. 4 shows the release of a bolt of the roller lock, and FIG. 5 shows the release of a hold-down device of the roller lock.FIG. 1 shows a detail of a printing press 1 for printing sheet-shaped printing material in lithographic or planographic offset printing. The detail shows parts of an anilox inking unit 2 of the printing machine 1. The roller lock 5 has a quick-change device 6, which allows the operator to open and close the roller lock 5 in a tool-free manner for removing and inserting the roller 4. The roller lock 5 is mounted pivotably about a pivot joint 8 (cf. FIG. 2 ) by means of an actuating drive 7 in order to be able to adjust the roller 4 towards and away from the engraved roller 3. The actuator 7 is a pneumatic jack.The roller 4 has a roller journal 9 on which a pivot bearing 10 is seated. The rotary bearing 10 is a rolling bearing having an inner ring and an outer ring. The inner ring is fixed on the roller journal 9 and a support ring 11 is fixed on the outer ring, which support ring supports the roller 4. The support ring 11 has a substantially square outer contour 12 and a square circumferential surface. If corner bevels of the outer contour 12 are not neglected, the outer contour 12 is octagonal and the circumferential surface is an octagon.FIG. 2 shows that the roller lock 5 has a base body 13 which has a substantially U-shaped receiving shell 14 which is open at the top. The base body 13 has a substantially L-shaped cross section as seen in FIG. 3. The lower leg of the L-shaped cross section, which is horizontal in FIG. 3, forms the receiving shell 14 and a cover plate 15 is placed on the end of the vertical upper leg, which cover plate is fastened to the base body 13 with screws. The base body 13 and the cover plate 15 can also be formed integrally together, deviating from the example shown. The cover plate 15 is penetrated by an axle or a pin 16 which is rotatably mounted in the base body 13 and is secured against axial displacement in the base body 13. The pin 16 has a geometric, imaginary axis of rotation 17 (cf. FIG. 3 ).FIG. 3 shows that a first bushing 18 and a second bushing 19 are seated on the pin 16 such that they can be displaced along the axis of rotation 17. The first bushing 18 is located between the lower leg of the base body 13 and the cover plate 15. The second bushing 19 is located on the side of the cover plate 15 opposite the first bushing 18. The first linear guide is formed by an elongated hole 20 in the pin 16 and a transverse pin 21 in the first bushing 18 passing through the elongated hole 20. The second bushing 19 is connected to the pin 16 via a second linear guide. The second linear guide is formed by an elongated hole 22 in the pin 16 and a transverse pin 23 which extends through the elongated hole 22 and is seated in the second bushing 19.A first spring 24 can be loaded under pressure and is designed as a helical spring. The first spring 24 is inserted into a recess of the cover plate 15 and the pin 16 is inserted through the first spring 24. The first spring 24 is supported at one end on the cover plate 15 and at the other end on the first bushing 18 via intermediate discs 25. As a result, the first spring 24 is prestressed and tends to press the first bushing 18 against a stop 26 on the pin 16. The stop 26 is formed by an annular shoulder or projection of the pin 16. When the first bushing 18 abuts the stop 26, sufficient play or dead gear is present between the transverse pin 21 and the end of the elongated hole 20 that is situated toward the stop 26. A second spring 27 is a compression spring and is helically wound. The second spring 27 is supported at one end by a screw on the pin 16 and at the other end by the cross pin 23 on the second bushing 19. The second spring 27 is arranged in an axial bore of the pin 16 and is prestressed, so that it tends to press the second bushing 19 against the cover plate 15.On the first bushing 18, at its end substantially diametrically opposite the receiving shell 14, a support arm with a contact surface 28 facing the receiving shell 14 for contacting the outer contour 12 of the support ring 11 (cf. FIG. 1 ) is arranged, i.e. fastened or preferably formed on. The support arm forms a hold-down device 29. The first bushing 18 is mounted on the journal 16 so as to be axially displaceable via slide bearings 30. The first bushing 18 has a longitudinal bore through which the pin 16 is inserted and in which the sleeve-shaped slide bearings 340 are arranged. The longitudinal bore is eccentric relative to the outer circumferential circle of the first bushing 18, so that the latter forms an eccentric with a cam 31 for eliminating an axial play of the roller 4 in the roller lock 5 and a corresponding roller lock (not shown) for the other end of the roller 4. The cam 31 presses against the support ring 11 when the roller lock 5 is closed and pushes it together with the roller 4 seated therein in the direction of the other roller lock in order to bring the roller 4 into its correct axial operating position. The cam 31 is interrupted by a depression which gives the end of the roller journal 9 projecting from the supporting ring 11 sufficient free clearance.On the second bushing 19, a first cantilever arm and a second cantilever arm are arranged. The first cantilever arm is located at the free end of the second bushing 19 and forms a handle 32 for rotating the second bushing 19 together with the pin 16 and the first bushing 18. The latch 33 is bent in the direction of the cover plate 15 in a hook-shaped or L-shaped manner in order to engage behind the front edge of the cover plate 15 in a positive-locking manner with its downwardly pointing leg during locking. The second spring 27 secures the latch 33 in its locking engagement position after the latch 33 is snapped or snapped behind the front edge of the top plate 15 as the second bushing 19 rotates.FIGS. 4 and 5 show how the locking mechanism is released in order to be able to remove the roller 4 from the roller lock 5. FIG. 4 shows that in a first step the latch 33 is lifted out of engagement with the cover plate 15. In this case, the operator pulls the second bushing 19 together with the latch 33 upward along the pin 16 on the handle 32 counter to the force of the second spring 27. The transverse pin 23 slides in the slot 22, and the upward and release of the engagement of the latch 33 takes place very smoothly, because the spring force of the second spring 27 is comparatively low. When the second bushing 19 and the latch 33 are pulled upward, the first bushing 18 and the holding-down device 29 remain unchanged in their position. In this position, the contact surface 28 of the hold-down device 29 presses on the support ring 11, and the support ring 11, the pivot bearing 10 and the roller 4 are not shown in FIGS. 4 and 5 for reasons of better clarity. During the upward pulling, the latch 33 is pulled upward to such an extent that its hook-shaped end is located above the upper side of the cover plate 15.FIG. 5 shows a second step, in which the second bushing 19 together with the pin 16 and the first bushing 18 is pivoted about the axis of rotation 17 by an angle of approximately 90°. The second step takes place immediately following the first step, i.e. the operator does not release the handle 32 at all and holds the second bushing 19 in its position raised against the force of the second spring 27 during pivoting. Only when the pivoted components have reached their end position shown in FIG. 5 does the operator release the handle 32 again. During the pivoting, the holding-down device 29 comes out of radial overlap with the support ring 11 and the cam 31 is pulled away from the roller 4. The roller 4 then has sufficient axial play in the roller lock 5 and the roller 4 together with the pivot bearing 10 and the supporting ring 11 seated thereon can be removed upward from the receiving shell 14.List of reference characters1 Printing machine 2 anilox inking unit 3 engraved roller 4 roller 5 roller lock 6 quick-change device 7 actuator 8 rotary joint 9 roller pin 10 rotary bearing 11 support ring 12 outer contour 13 base body 14 receiving shell 15 cover plate 16 pin 17 rotation axis 18 first bushing 19 second bushing 20 elongated hole 21 transverse pin 22 elongated hole 23 transverse pin 24 first spring 25 intermediate disk 26 stop 27 second spring 28 contact surface 29 hold-down device 30 slide bearing 31 cam 32 handle 33 latch

Claims

Roller lock (5) for a printing press (1), comprising a holding-down device (29) which radially secures a roller (4) in the roller lock (5) in a closed position, wherein the holding-down device (29) is loaded by a first spring (24), is mounted rotatably about an imaginary axis of rotation (17) into the closed position and can be locked in the closed position by a bolt (33), wherein the bolt (33) is loaded by a second spring (27), characterized in that, when the bolt (33) is unlocked, the bolt (33) can be adjusted relative to the holding-down device (29) and in the process along the imaginary axis of rotation (17).Roller lock according to claim 1, characterised in that the latch (33) is connected to the holding-down device (29) in a rotationally fixed manner, so that the latch (33) and the holding-down device (29) can be rotated together about the imaginary axis of rotation (17).Roller lock according to claim 1 or 2, characterised in that the latch (33) is adjustable relative to the hold-down device (29) and in the process against the action of the second spring (27).Roller lock according to Claim 1, characterized in that the load of the hold-down device (29) by the first spring (24) is greater than the load of the latch (33) by the second spring (27), the loads being rectified.Roller lock according to claim 1, characterised in that a pin (16) is rotatably mounted about the imaginary axis of rotation (17), on which pin a first bushing (18) is seated in a rotationally fixed and displaceable manner, on which bushing the holding-down device (29) is arranged.Roller lock according to claim 5, characterised in that a second bushing (19) is seated on the pin (16) in a rotationally fixed and displaceable manner, on which bushing the bolt (33) is arranged.Roller lock according to claim 6, characterised in that a cam (31) is arranged on the first bushing (18) and the latter is rotatable together with the pin (16) about the imaginary axis of rotation (17), so that in the locking position the cam (31) is pivoted towards the roller (4) in order to fix or secure the roller (4) axially.Roller lock according to claim 1, characterised in that the latch (33), in the locking position, engages in a component which is different from a roller journal (9) of the roller (4) and a pivot bearing (10) seated on the roller journal (9).Roller lock according to claim 1, characterised in that the hold-down device (29), in the closed position, presses on a polygonal outer contour (12) of a pivot bearing (10) mounted on a roller journal (9) of the roller (4) or of a support ring (11) mounted on the pivot bearing (10).Printing machine (1) having an engraved roller (3) and a roller lock (5) designed according to one of Claims 1 to 9 for receiving a roller (4) which can be adjusted to the engraved roller (3).

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