WO2008006585A1

WO2008006585A1 - Clamping device comprising a tiltable clamping piece

Info

Publication number: WO2008006585A1
Application number: PCT/EP2007/006194
Authority: WO
Inventors: Andreas Zahnd
Original assignee: Wifag Maschinenfabrik Ag
Priority date: 2006-07-12
Filing date: 2007-07-12
Publication date: 2008-01-17
Also published as: EP2040927A1; EP2040927B1; DE102006032264A1; ATE451241T1; DE502007002279D1

Abstract

The invention relates to a device for clamping at least one flexible printing plate to a printing cylinder, said device comprising: a) a clamping piece (11, 12) which is arranged in a clamping channel of the printing cylinder (1) and forms, with a clamping surface, a clamping gap (F) into which a front part (3, 5) of the printing plate (2, 3) can be inserted; and b) an elastic element for subjecting the clamping piece (11, 12) to an elastic force; c) an outer surface of the clamping piece (11, 12) pressing against a bearing point which is formed in the clamping channel and supports the clamping piece (11, 12) in such a way that it can be tilted, against the elastic force, away from the clamping surface.

Description

Clamping device with tiltable clamping piece

The invention relates to a device for clamping a bendable pressure pad on a printing cylinder in or for a rotary printing press, preferably web-fed rotary printing press. The invention can be used in particular in offset printing, both in wet and dry offset.

For clamping of pressure linings clamping devices of various types are known. DE 42 25 949 C2 discloses a terminal by means of spring tongues. Although such clamping devices are easy to produce and therefore inexpensive, but problematic in terms of the exact positioning of the nip. Massive clamps are generally superior in terms of the precision with which the position of the respective nip can be given design. From DE 200 22 737 Ul a clamping device with a longitudinally extending in the channel shaft is known in which a plurality of clamping pieces are guided radially to the shaft each movable in a sliding contact and with respect to the shaft radially outwardly against a clamping surface with a Spring force to be applied. The shaft is movable between a closed position, in which the clamping pieces each form a clamping gap with the clamping surface, and a release position to and fro. The clamping device requires a considerable design effort. A simpler clamping device is known from DE 10 2005 029 167.8. It comprises a plurality of clamping pieces, which are guided independently of each other in sliding contact directly by walls of the clamping channel linear and pressed by spring force against the clamping surface. Although the clamping device is cheaper to manufacture and easy to install, the linear guide still requires a very precise production of guide surfaces of the clamping channel and the clamping pieces. It is an object of the invention to provide a simple clamping device with precisely located nip.

The invention has for clamping a bendable pressure pad on a printing cylinder, a device to the object, hereinafter also referred to as clamping device comprising a clamping piece and a spring member for acting on the clamping piece with a spring force. The clamping piece is arranged in a clamping channel of the printing cylinder and forms a clamping surface with a clamping gap, in which a Abbug the pressure pad is inserted. For example, the clamping piece on a flat, in particular to the clamping surface in approximately parallel surface, between which and the clamping surface of the clamping channel of the Abbug can be inserted. The spring member is preferably also disposed in the clamping channel, but in principle could also be arranged outside of the clamping channel and act from there on the clamping piece. In any case, the spring force biases the clamping piece in the direction of the clamping surface. Prior to insertion of the bend, it preferably biases the clamp against the clamping surface, i. before inserting the Abbug the clamping piece is preferably in contact with the clamping surface. The clamping piece is stiff in relation to its clamping function, at least can be neglected in the clamping piece possibly existing elasticity against the elasticity of the spring member. Clamp and spring member are preferably separate parts. The clamping piece is preferably in one piece, whereby a multi-part clamping piece could find application. By manufacturing the clamping piece as in this sense rigid body, the distance that has the nip of a located on the outer periphery of the impression cylinder edge of the clamping channel, can be precisely specified. An exact compliance with a desired distance to the edge is desirable because the side register of the pressure pad to be clamped is advantageously set before clamping.

According to the invention, the clamping piece contacted with an outer surface formed in the clamping channel bearing, which supports the clamping piece tilted. The clamping piece is tilted in contact with the bearing against the restoring spring force of the spring member of the clamping surface. The spring member is biased stronger in a tilting of the clamping piece, so that the clamping force exerted by the clamping piece in the clamping force increases when the clamping piece moves in a tilting movement of the clamping surface. In a preferred embodiment, the spring force is introduced in a direction in the clamping piece, which has a common directional component with the direction of the force exerted by the clamping piece on the bearing point. More preferably, the two directions are at least substantially coincident. It is advantageous if the clamping force exerted by the clamping piece on the clamping surface and the force exerted by the clamping piece on the bearing point have a common directional component. More preferably, the two forces act in each case at least with their predominant part in the same direction. The clamping piece is preferably tilted freely back and forth, so is stretched only by means of the spring force in the direction of the clamping surface, but in principle, the possibility of a releasable blocking the tilting mobility should not be excluded. The clamping piece advantageously does not have to be forcibly tilted by means of an external engagement, but tilts away when inserting the Abbugs in the nip of the clamping surface and upon withdrawal of the Abbug due to the spring force by itself again in the direction of the clamping surface. The insertion into the nip forces the tilting movement and pulling out allows them.

A tilting bearing can be precisely produced in a simple manner. The processing effort is less with the same precision in terms of the location of the nip as for a linear guided clamping piece or a rotary joint with circumferential sliding surfaces. However, the bearing can be seen in the tilt plane, i. in the cross section of the printing cylinder, form a short arc. More preferably, however, the bearing is formed by an edge.

Preferably, the clamping piece with the bearing contact only in a line of contact. The position of the contact line preferably does not change during the tilting movement. In alternative embodiments, to which, however, a line contact is preferred over, the bearing point and the clamping piece on mutually congruent bearing surfaces which form over a tilt angle of preferably at most 30 °, a sliding pair, ie, a pivot bearing. For the function of the clamping piece a tilt angle is sufficient, which just allows the insertion of the Abbugs. For practical purposes tilting movements are advantageously possible by a tilt angle, which exceeds the minimum tilt angle required for the function by a certain amount, preferably only so much that, despite unavoidable manufacturing tolerances, the Kippbeweglichkeit is ensured by the minimum tilt angle. For the Kipplagerung it is sufficient and corresponds to preferred embodiments, when the clamping piece with the bearing point is only in pressure contact.

The clamping piece preferably has only a single degree of freedom of movement, namely the degree of freedom of the tilting movement about a tilting axis fixed with respect to the pressure cylinder. The tilting axis preferably extends in or near the region of the contact, in the case of the most preferred embodiment of the line contact it coincides with the contact line or axis. Here as well as in the above context, the concept of the contact line is not understood as a mathematically exact line, but only as a line, as it is approximated under the usual manufacturing conditions, ie manufacturing tolerances, a mathematically exact line.

In embodiments in which the tilting axis is formed by an edge and thus directly on the contact line, either the clamping piece or, more preferably, the bearing point can form the edge. The respective other, preferably the clamping piece, preferably has a flat bearing surface for the pressure contact with the edge. Although a tilting mobility is given preference around an edge, as this can best be ensured that the tilting axis is stationary with respect to the forme cylinder, should not be ruled out in principle that the contact partners are in pressure contact, for example, convexly curved, from which However, a not so advantageous Rolloder rolling / sliding mobility of the clamping piece results. If the tilting bearing is formed as a hinge about a with respect to the forme cylinder fixed, spaced from the contact area tilting axis, either the bearing point or the clamping piece form the partially surrounding bearing surface.

The clamping piece preferably forms only a single axially narrow clamping gap. The axial, ie measured in the axial direction of the printing cylinder width of the nip and preferably the clamping piece as a whole is in preferred embodiments at most one tenth of the width of a pressure pad to be clamped simple width. In the preferred application example, in newspaper printing, at most one tenth, more preferably at most one twentieth of the width of a horizontal newspaper page measured in the axial direction. In absolute terms, the width should be at most 30 mm or better at most 20 mm. An axially narrow clamping piece with a single narrow nip is preferable in view of the precise specification of the location of the nip a broad nip or a wide clamping piece with two or more nips next to each other, as it becomes more difficult with increasing width, the tilt axis exactly the place and according to their orientation. The precision is also conducive if provided for generating the spring force only one of the clamping piece associated, ie acting on the clamping piece spring member, preferably disposed in the clamping channel. In preferred several acting on the same Abbug clamping pieces, preferably two clamping pieces per Abbug, this means that for each of the clamping pieces each have their own spring member is provided. The feature of the narrow clamping piece, at least narrow nip, and the feature according to which, with several clamping pieces, each of the clamping pieces is supported independently of the other and acted upon by a spring force, are advantageously used in combination, but are also already alone advantageous, furthermore even without the here claimed invention of Kippbeweglichkeit.

A wall of the clamping channel forming the clamping surface advantageously extends as far as an opening of the clamping channel located on the outer periphery of the printing cylinder, at least substantially radially with respect to the axis of rotation or transversely to the circumferential direction of the printing cylinder. Preferably, this channel wall is flat. A radial or substantially radial extension allows the absorption of a Abbugs, which points to the adjacent, resting on the peripheral surface of the printing cylinder portion of the printing pad at a right angle. In preferred developments extends in the circumferential direction of the clamping surface facing on the other side of the clamping channel a same channel wall, which forms a further clamping surface for the other turn of the same pressure pad or the turn of another pressure pad and in particular may be parallel to the clamping surface. The invention further developing features of such pressure pads and clamping and opening areas of clamping channels are described in DE 10 2005 029 167. A symmetrical in cross-sectional shape of that portion of the clamping channel which extends from the two clamping surfaces to the channel opening, even without the feature of parallelism of the two channel walls advantageous since such clamping channels with corresponding clamping devices invariant with respect to the direction of rotation of the impression cylinder are and can be operated both clockwise and anti-clockwise. The clamping piece has in preferred embodiments, a bearing portion and a projecting from the bearing portion, in the cross section of the printing cylinder in comparison with the bearing portion narrow finger. The finger forms the nip, and the bearing portion is advantageously the assembly in the channel, preferably the tilting bearing of the clamping piece. Preferably, the z. B. integral clamping piece z. B. with its bearing portion on the printing cylinder, in particular the filler, that is, in particular, that the clamping piece is in engagement with the printing cylinder or is guided by the printing cylinder. The assembly preferably comprises an attachment of the clamping piece, which leaves the clamping piece, however, the required freedom to perform its function. The attachment may advantageously form an abutment for the spring member or hold the clamping piece to a filler, as long as the filler is not yet inserted into a matching recess of the printing cylinder. In particular, the spring member may be supported on the filler and the clamping piece or on the fastening means and the clamping piece. Preferably, the spring member surrounds the attachment means, wherein, for example, the spring member may be surrounded by the clamping piece. As a fastening means, in particular a mounting bolt, preferably a bolt serve. The spring force preferably acts in the longitudinal direction of the mounting bolt.

In the clamping channel a further clamping piece is expediently arranged, with which the other Abbug the same pressure pad or a turn of another pressure pad can be clamped. Unless otherwise stated, all versions apply equally to both clamps. The clamping device is thus formed largely symmetrically with respect to the clamping pieces and their mobility with respect to the leading and the trailing side of the clamping channel. A difference to be pointed out results in preferred embodiments, however, from the fact that the clamping pieces are advantageously mounted on the same side of the clamping channel, but the respective spring force applied in different directions, preferably in opposite directions on the two types of clamping pieces becomes. The assembly of both types of clamping pieces on the same side of the clamping channel, ie on the same side seen in the circumferential direction of the printing cylinder, simplifies the manufacture and assembly. It is advantageous if the axially offset in the clamping channel to each other clamping pieces overlap each other in the circumferential direction of the printing cylinder. The clamping pieces or at least the areas of the clamping pieces which form the clamping gaps, overlap each other in particular, if no pressure pad is clamped, so no turning into one of the clamping gaps of the overlapping clamping pieces protrudes. In embodiments in which the clamping pieces have said bearing portions and the nip forming fingers, it is sufficient in principle, if only the fingers overlap each other, but more preferably also overlap the bearing portions. Mutually overlapping clamping pieces are particularly advantageous if the opening of the clamping channel and the channel region adjoining the opening radially inwardly are very narrow, for example 5 mm or even narrower. The overlapping arrangement makes it possible to make the portions of the clamping pieces, which form the clamping gaps, thicker and thus stiffer in the circumferential direction of the printing cylinder than is possible next to one another in the case of an arrangement in the circumferential direction.

The spring members are preferably mechanical springs and may be in particular spring-loaded coil springs or coil springs. Alternatively, pneumatic springs come into question. If a common spring member is used for several clamps, this also applies to such a spring member.

The printing cylinder is preferably a forme cylinder, but may for example also be a blanket cylinder, as are known, for example, from the newspaper offset printing. The printing cylinder preferably has twice the circumference. If necessary, he also has only a simple scope. If the printing cylinder is a blanket cylinder, it may have a single continuous clamping channel or a plurality of axially offset clamping channels, which are offset from one another in the circumferential direction. The blanket or the plurality of printing blankets arranged side by side on the blanket cylinder in such embodiments span the full circumference of the cylinder. However, a subdivision in the circumferential direction is also conceivable. If the pressure cylinder is a form cylinder, embodiments are preferred in which the one or more clamping channels extend or extend axially over at least the major part of the length of the forme cylinder. Thus, a forme cylinder simple circumference in particular a single continuous channel and a double-circumference form cylinder having two continuous channels with an offset from each other by 180 ° in the circumferential direction. Alternatively, however, axially offset clamping channels can also be provided in the case of a forme cylinder, which are offset from one another in the circumferential direction. A forme cylinder of twice the circumference may, for example, have two groups of two clamping channels axially next to one another, wherein the clamping channels within the respective group are offset by 180 ° in the circumferential direction and the clamping channels are offset from one another by 90 ° from one group to the next.

Preferred features are also described in the subclaims and their combinations.

Hereinafter, an embodiment of the invention will be explained with reference to figures. The features disclosed in the exemplary embodiment each individually and in any combination advantageously further extend the subject-matter of the claims and also the embodiments described above. Show it:

Figure 1 is a clamping channel in a cross section and

Figure 2 shows the clamping channel in a different cross section.

FIGS. 1 and 2 show a forme cylinder 1 of a web-fed rotary offset printing press for newspaper printing in each case in a different cross-section. The forme cylinder 1 has a double circumference, ie at the periphery of the forme cylinder 1 in the circumferential direction two printing plates 2 and 4 are arranged in succession and clamped by two clamping devices which are arranged in two clamping channels. The clamping channels each extend continuously over the entire axial length of the forme cylinder 1 and are mutually offset in the circumferential direction by 180 °. The forme cylinder 1 can in particular be four or six newspaper pages wide. The printing plates 2 and 4 have at their leading in the direction of rotation V and trailing ends each a turn on, which is clamped in one of the two clamping channels. In the clamping channel shown in Figures 1 and 2 of the advancing Abbug 3 of the printing plate 2 and the trailing Abbug 5 of the printing plate 4 are clamped. The bevels 3 and 5 are to the resting on the circumference of the forme cylinder 1, adjoining the turn 3 or 5 area of the respective printing forme 2 or 4 bent at right angles. Although the printing plates 2 and 4 are so flexible that they rest in the clamped state on the curved peripheral surface of the forme cylinder 1, but on the other hand, they are so stiff that the bends 3 and 5 are stiff with respect to the angulation.

The clamping device comprises a plurality of first clamping pieces 1 1, which are arranged in the axial direction of the forme cylinder 1 side by side in the clamping channel and by means of which the side by side on the forme cylinder 1 arranged printing plates 2 can be clamped at their leading turns 3. The clamping device further comprises a plurality of second clamping pieces 12, which are also arranged at intervals axially adjacent to each other in the clamping channel and by means of which on the forme cylinder 1 juxtaposed printing plates 4 can be clamped at their trailing turns 5. FIG. 1 shows one of the first clamping pieces 11 and FIG. 2 shows one of the second clamping pieces 12. The clamping pieces 1 1 and 12 are arranged alternately in the axial direction of the forme cylinder 1 and in each case at a distance from each other and stored so that each of the clamping pieces 11 and 12 can perform independently of any other required for the clamping movement. For each printing form 2 and 4 two first clamping pieces 11 are provided for the leading Abbug 3 and two second clamping pieces 12 for the trailing Abbug 5. Each of the clamping pieces 1 1 and 12 each forms only a single nip F. The clamping pieces 11 and 12 are compared to the printing plates 2 and 4 is very narrow; Preferably, its width measured in the axial direction is at most one tenth, more preferably at most one twentieth of the width of the single-wide printing plates 2 and 4.

The clamping pieces 11 and 12 are mounted on a filler 8, which is inserted in a recess of the forme cylinder 1 and fixed to the forme cylinder 1 and immovably connected. The filler 8 forms a short arc portion of the outer peripheral surface of the forme cylinder 1. Unless the assembly of the clamping device is concerned, the filler 8 can be considered as belonging to the forme cylinder 1.

The clamping channel has on the outer circumference of the forme cylinder 1 an axially straight, slot-shaped channel opening through which the bends 3 and 5 protrude into the clamping channel. At the channel opening close a leading channel wall Ia and a trailing Ka Wall Ib. The clamping pieces 1 1 form with the leading channel wall Ia depending on a nip F for the leading prints 3. The clamping pieces 12 form for the trailing turns 5 each have a nip F with the trailing channel wall Ib. The channel walls Ia and Ib thus form the mating surfaces or clamping surfaces for the clamping pieces 11 and 12. The channel walls Ia and Ib extend from the channel opening to at least the respective nip F plane parallel to an axial / radial plane on the axis of rotation of the forme cylinder first Since they are only a few millimeters apart, you can also, in a good approximation, also be referred to as axial / radial planes. In the exemplary embodiment, they also extend radially inward even beyond the respective clamping gap F to each other plane-parallel. Radially inwardly from the narrow gap between the channel walls Ia and Ib, the clamping channel opens to a receiving space for the storage and assembly of the clamping pieces 1 1 and 12th

The clamping pieces 1 1 are equal to each other, and they are mounted in the same way and movably mounted for clamping. Executions only to one of the clamping pieces 1 1 thus apply equally to the other clamping pieces 11. The clamping piece 11 consists of a bearing portion 13 which is received in the receiving space of the clamping channel and is surrounded by the walls, and a finger 14, which protrudes from the bearing portion 13 outwardly toward the channel opening and into the gap between the channel walls Ia and Ib protrudes. The finger 14 forms with the channel wall Ia the nip F. The finger 14 tapers from the nip F in the direction of the channel opening, so that an insertion funnel for the Abbug 3 is formed. In the exemplary embodiment, it has a constant inclination from its outer end in the direction of the clamping gap F.

The clamping piece 11 is tiltable in the cross-sectional plane about a tilt axis R as a whole. The tilting axis R is formed by a pressure contact of the clamping piece 1 1 with a bearing point, in the exemplary embodiment, an axially straight edge which is formed with respect to the axis of rotation of the forme cylinder 1 radially inwardly of the nip F on a channel wall 1 c of the receiving space. The channel wall 1 c forms a bottom of the clamping channel. In the channel wall Ic is axially continuous a recess 18, in the embodiment, a rectangular groove, incorporated. The bearing point is from one of the two outer edges of the recess 18th educated. The edges are each shaped as an edge. The clamping piece 1 1 accordingly has a bearing surface with which it presses against the bearing point formed in the clamping channel.

In order to generate in the nip F the clamping force required for clamping the Abbugt 3, the clamping member 1 1 is acted upon by a prestressed spring member 7 with a spring force which biases the finger 14 in the direction of the channel wall Ia. The spring member 7 is a loaded on compression coil spring. Each of the clamping pieces 11 is assigned in each case its own spring member 7, which acts in each case only on the associated clamping piece 1 1. The spring member 7 presses the clamping piece 11 further against the bearing point. The spring axis of the spring member 7 extends at right angles to the channel wall Ia. An inclination would be less preferred, but still possible.

The force exerted by the spring member 7 on the clamping piece 11 spring force acts substantially in the same direction as the force exerted by the clamping piece 11 on the bearing pressure. The clamping piece 11 contacts the bearing with an outer surface which faces in substantially the same direction as that surface with which the clamping piece 1 1 forms the nip F. However, this does not mean that the two surfaces in question, namely the clamping surface and the bearing surface of the clamping piece 11, should be plane-parallel or only parallel, the respective surface normals have only a sufficiently large direction component in common with the spring force, so that by the same spring force to a the bearing surface of the clamping piece 11 against the bearing point of the clamping channel and the clamping surface of the clamping piece 11 are pressed in the direction of the clamping surface formed by the channel wall Ia.

The clamping piece 1 1 is mounted by means of a mounting bolt 9, which is designed in the embodiment as a bolt on the side of the clamping channel on which the channel wall Ia is formed. The mounting bolt 9 has a shoulder on which the spring member 7 is supported. Along the spring axis of the spring member 7 of the shoulder of the mounting bolt 9 opposite the clamping piece 1 1 has a web 15 on which the spring member 7 is also supported. The spring member 7 is stretched in this way between the mounting bolt 9 and the clamping piece 11 and pushes the clamping piece 11 in the direction of its spring axis and thus the finger 14 in the direction of the channel wall Ia, whereby the terminals of the Abbugs 3 in the nip F required clamping force is generated. The mounting bolt 9 is perpendicular to the axial / radial plane of the forme cylinder 1, which extends centrally between the two edges of the channel opening.

All of the clamping pieces 1 1 and 12 each protrude with a projection 16 in the recess 18 and form with one of the two edges of the recess 18, the tilting bearing for the respective clamping piece 1 1 or 12. The spring member 7 acts on the from the tilt axis R to the Clamping gap F extending, conceived as a straight line tilting lever between the tilting axis R and the nip F. In this way, a translation is obtained by the spring travel of the spring member 7 is smaller than the arc, the fingers 14 travels in a tilting movement. The spring axis is perpendicular to the rocker arm. However, an inclination would also be possible. For the clamping piece 11 is preferred that it surrounds the edge of the recess 18 which forms the tilting bearing for the clamping piece 11, with a concave portion. The concave portion has an inner edge formed by two surfaces at an obtuse angle. One of the surfaces is formed by the projection 16 and the other of the surfaces is formed by the bearing portion 13.

The projection 16 is tapered in cross-section conical to its free end. The bearing surface of the clamping piece 11, which contacts the bearing point of the clamping channel is therefore in relation to the spring axis simply as an inclined plane, d. H. as a plane with constant slope, shaped. The tilting bearing is formed in this way in the manner of a rocker. Instead of introducing the spring force as preferred between the tilting axis R and the nip F in the clamping piece 11, the tilting axis could be formed in a region of the finger 14 near the bearing portion 13 in the same shape of the clamping piece 1 1, in the embodiment of the radially inner Edge of the canal wall Ia. Such an arrangement would correspond directly to a rocker.

The bearing portion 13 forms a U-shaped bracket which connects the finger 14 rigidly with the projection 16. The spring axis of the spring member 7 and the longitudinal axis of the mounting bolt 9 are parallel to the two legs of the bracket. The mounting bolt 9 penetrates for attachment to the filler 8 the web 15, which forms the bottom of the bracket. The finger 14 projects from the radially outer leg of the bracket outward, and the projection 16 protrudes from the inner leg of the bracket radially inward. The finger 14 and the projection 16 protrude from the free, remote from the bottom of the bracket end of the respective leg and based on the two legs at the same height. The tilting axis R is therefore formed at least to a good approximation radially below the clamping gap F. Accordingly, the rocker arm between the tilting axis R and the nip F extends in straight extension to the channel wall Ia, so that a clamping gap F forming surface area of the finger 14 of the clamping gap F co-forming clamping surface of the channel wall Ia when inserting the Abbug substantially in the right Angle tilts.

The bearing portion 13 is enclosed in the receiving space between two radially opposite walls Id with a small clearance. The game is chosen so that the location of the clamping gap F is precisely predetermined, on the other hand, however, the tilting movements are not hindered. The game is at most 0.1 mm, preferably it is only a few hundredths of a millimeter. The receiving space extends with respect to the clamping surface of the leading channel wall Ia below the level of the clamping surface. At the same time, the receiving space could alternatively extend below the level of the clamping surface of the trailing channel wall Ib. The receiving space forming walls Id are preferably approximately perpendicular to the channel wall 1 a, d. H. for example, with a tolerance of about ± 20 °, more preferably ± 10 °. The walls Id are advantageously parallel to each other. Furthermore, the bearing portion 13 is in its bow portion to its side facing away from the finger 14 side, d. H. Ie towards a channel wall, tapers, so that the bracket can not hinder the tilting movements. The channel wall Ie is preferably approximately parallel to the leading or trailing channel wall Ia, Ib and, alternatively or additionally, approximately perpendicular to the walls Id.

The mounting bolt 9 is bordered by the web 15 of the clamping piece 11. It is also true for these edging formed by the web 15 that it has just enough play that the tilting movements of the clamping piece 11 are not obstructed. The two enclosures, namely on the one hand the enclosure through the channel walls Id and on the other the enclosure of the mounting bolt 9, are realized in the embodiment in combination. In principle, one of the two enclosures would be sufficient, in particular in the clamping piece 12, which surrounds the mounting bolt 9 close to the rocker arm by means of a web 17. The clamping piece 12 differs from the clamping piece 1 1 only with respect to the direction in which the associated spring member 7 acts on the clamping piece 12. Since the clamping piece 12 is mounted on the same side of the clamping channel as the clamping piece 1 1, namely at the filler 8, the finger 14 of the clamping piece 12, however, the clamping gap with the opposite, trailing channel wall Ib forms, the spring member 7 can directly on the Support channel wall Ie. The spring member 7 acts on the web 17, which connects the leg of the clamping piece 1 1 only remaining leg with each other. The mounting bolt 9 protrudes through the web 17, as already through the web 15 of the clamping piece eleventh

As already mentioned, a plurality of the clamping pieces 1 1 and several of the clamping pieces 12 are arranged in alternating succession at intervals with respect to each other in the clamping channel. In this case, each one of the clamping pieces 11 is arranged close to one of the clamping pieces 12, and between the arrangement according to the pairs formed in each case remains a greater distance.

The fingers 14 arranged in the same clamping channel clamping pieces 1 1 and 12 overlap each other in the circumferential direction of the forme cylinder, d. H. they are in an axial flight. They overlap each other to a greater extent, preferably for the most part, in both extreme tilt positions, d. H. both in the tilted position that they occupy prior to insertion of the associated Abbugs 3 or 5, as well as in the tilted position they take when the assigned Abbug 3 or 5 is clamped. In this way, the narrow space in the circumferential direction, which remains between the channel walls Ia and Ib, in the sense of maximum rigidity of the clamping pieces 11 and 12 is used.

The bends 3 are the non-clamping clamping pieces 12 and the bends 5 are the non-clamping clamping pieces 12 opposite each provided with a recess 6. When clamping the respectively assigned Abbugs, for example when clamping the Abbugs 3 by the clamping pieces 1 1, the clamping pieces 1 1 are tilted in the region of the respective opposite recess 6 to almost against the channel wall Ib. This measure also contributes to the fact that the fingers 14 are as thick as possible and thus the clamping pieces 11 and 12 can be made as rigid as possible. Conversely, can the channel walls Ia and Ib move very close to each other and the channel opening are particularly narrow.

The clamping device allows a quick change of printing plates 2 and 4 in a simple manner.

For example, the printing forme 2, the printing plate 2 of the expired production at one of its two ends, for example, the leading end, recorded, preferably by suction. The printing plate 2 is raised at the respective end and thereby pulled the Abbug 3 from the nip F. As soon as the free front end of the Abbugs 3 has passed the nip F, the clamping piece 11 tilts against the channel wall Ia due to the spring force. Subsequently, the trailing Abbug the printing plate 2 is pulled out of the nip formed in the opposite clamping channel and the used printing form 2 transported away.

A new printing plate 2 for the next production is introduced with one of its two turns in the associated clamping channel. By way of example, it is assumed that it is introduced with the turn 3 in the clamping channel Ia-Ie. The Abbug 3 is guided in the insertion funnel formed by the finger 14 in the direction of the bottom of the insertion funnel and thus in the direction of the nip F and finally inserted by pressure in the nip F. This is done in the context of a continuous insertion movement of the short Abbüg 3.

The Abbug 3, and also the other Abbugen the printing plates 2 and 4, has a measured along the channel wall 1 a height of preferably at most 10 mm, more preferably at most 9 mm. During the imports into the clamping channel, it first comes into engagement with a register device arranged in the clamping channel for the lateral alignment of the printing plates 2 and 4. For each printing plate 2 and 4, the register device comprises at least one register cam, preferably exactly one register cam, and takes care of itself known manner for setting the page register. The printing form 2 passes only after the successful in this way adjustment of the side register in the nip F, ie for clamping the Abbugt 3 is only the foremost area available. The more it comes on that a desired distance between the peripheral edge of the clamping channel and the nip F is maintained as accurately as possible. A further advantage, in particular with regard to an automatic printing plate change, is the free tilting mobility during insertion against and during withdrawal supported by the spring force.

Bezuεszeichen:

1 forme cylinder

2 printing form

3 turn

4 printing form

5 turn

6 recess

7 spring member

8 filler

9 mounting bolts

10 -

11 clamping piece

12 clamping piece

13 bearing section

14 fingers

15 footbridge

16 advantage

17 footbridge

18 deepening

F nip

R tilting axis

V direction of rotation

Claims

claims

Device for clamping at least one bendable pressure pad on a printing cylinder, the device comprising: a) a clamping piece (11, 12) which is arranged in a clamping channel of the printing cylinder (1) and forms a clamping gap (F) with a clamping surface, b) and a spring member (7) for acting on the clamping piece (11, 12) with a spring force, c) wherein the clamping piece (1 1 , 12) abuts with an outer surface against a bearing point formed in the clamping channel, which supports the clamping piece (1 1, 12) tilted away from the clamping surface against the spring force.

2. Apparatus according to claim 1, characterized in that the clamping piece (11, 12) is pressed by the spring force against the bearing point.

3. Device according to the preceding claim, characterized in that on the clamping piece (1 1, 12) acting spring force and by the clamping piece (11, 12) acting on the bearing force have a common directional component.

4. Device according to one of the two preceding claims, characterized in that in the clamping gap (F) acting on the clamping surface spring force and acting on the bearing spring force have a common directional component

5. Device according to one of the preceding claims, characterized in that the clamping piece (1 1, 12) has only the degree of freedom of movement of the Kippbeweglichkeit about a tilting axis formed by the contact with the bearing point (R).

6. Device according to one of the preceding claims, characterized in that the clamping piece (1 1, 12) with the bearing point has at least substantially only line contact.

7. Device according to one of the preceding claims, characterized in that a formed on the clamping piece or preferably in the clamping channel edge forms the bearing point.

8. Device according to one of the preceding claims, characterized in that one of the walls (Ia-Ie) of the clamping channel, which surround the clamping piece (11, 12) forms the bearing point.

9. Device according to one of the preceding claims, characterized in that one of the clamping piece (11, 12) formed rocker arm extending from a tilting axis (R) of the clamping piece (1 1, 12) to the clamping gap (F), at least has substantially parallel to the clamping surface.

10. Device according to one of the preceding claims, characterized in that the clamping piece (11, 12) forms only a single nip (F) whose width is preferably at most 10% of the width of a pressure pad to be clamped (2, 3) simple width.

1 1. Device according to one of the preceding claims, characterized in that the spring member (7) is supported in the clamping channel and only on the clamping piece (1 1, 12) acts.

12. Device according to one of the preceding claims, characterized in that the clamping piece (11, 12) has a bearing portion (13) for mounting the clamping piece (11, 12), preferably the tilting bearing, and one of the bearing portion (13) to the outside in the direction of an opening of the clamping channel protruding fingers (14), which forms the clamping gap (F) with the clamping surface.

13. Device according to the preceding claim, characterized in that the spring member (7) is supported in the clamping channel and in the region of the bearing portion (13) acts on the clamping piece, preferably in the bearing portion (13) protrudes.

14. Device according to one of the preceding claims, characterized in that the clamping piece (11, 12) tapers away from the clamping gap (F) to the outside, so that an insertion funnel for the Abbug (3, 5) is obtained.

15. Device according to one of the preceding claims, characterized in that the clamping piece (11, 12) by means of a mounting bolt (9) is mounted and in the longitudinal direction of the mounting bolt (9) is acted upon by the spring force.

16. Device according to one of the preceding claims, characterized in that the spring force acts at least substantially in the circumferential direction of the pressure cylinder (1).

17. Device according to one of the preceding claims, characterized in that the clamping piece (11, 12) in a formed in the clamping channel recess (18), preferably over at least a major part of the length of the clamping channel extending groove, protrudes and an edge region the recess, preferably an edge forming the bearing point.

18. Device according to the preceding claim, characterized in that between the clamping piece (11, 12) and the bottom of the recess (18) free space remains.

19. Device according to one of the preceding claims, characterized in that a wall (Ia) of the clamping channel, which extends with respect to the axis of rotation of the printing cylinder (1) at least substantially radially up to an opening of the clamping channel forms the clamping surface.

20. Device according to one of the preceding claims, characterized in that in the clamping channel (Ia-Ie) at least one register body for adjusting the side register of the pressure pad (2, 4) axially offset from the clamping piece (11, 12) is arranged and that the register body of a of the pressure cylinder (1) formed opening of the clamping channel (Ia-Ie) has a smaller distance than the clamping gap (F), so that the pressure pad (2, 4) during insertion into the clamping channel (Ia- Ie ) engages the register body before it clamps the clamping piece (11, 12).

21. Device according to one of the preceding claims, characterized in that in the clamping channel, a further clamping piece (12, 11) is arranged and forms by applying a spring force with a further clamping surface a clamping gap (F), in which a Abbug (5, 3) of the same or a further pressure pad (3, 2) can be inserted, wherein the further clamping piece (12, 1 1) abuts with an outer surface against a formed in the clamping channel further bearing point, the further clamping piece (12, 1 1) stored tilted away against the spring force of the further clamping surface.

22. Device according to the preceding claim, characterized in that a further wall (Ib, Ia) of the clamping channel, which extends in relation to the axis of rotation of the printing cylinder (1) at least substantially radially up to an opening of the clamping channel, the further clamping surface forms.

23. Device according to the preceding claim, characterized in that the walls (Ia, Ib), which form the clamping surfaces are at least substantially parallel to the opening from each other, wherein the distance or a maximum distance is preferably at most 5 mm.

24. Device according to one of the three preceding claims, characterized in that the Abbug (3, 5) has a recess (6) into which in the clamped state that of the clamping pieces (1 1, 12) protrudes, which does not jam the Abbug.

25. Device according to one of the four preceding claims, characterized in that the clamping pieces (1 1, 12) in the circumferential direction of the printing cylinder (1) at least in the region of the nip formed by them (F) to a greater extent, preferably to a predominant Part, overlap.

26. Device according to one of the preceding claims, characterized in that in the clamping channel a plurality of the clamping pieces (11, 12) are arranged individually tiltable and each form a clamping gap (F) with the clamping surface and that the clamping pieces (1 1, 12) Are associated spring members (7), each of which acts on only one of the clamping pieces (1 1, 12).