WO2008006584A1

WO2008006584A1 - Clamping device comprising overlapping clamping elements

Info

Publication number: WO2008006584A1
Application number: PCT/EP2007/006193
Authority: WO
Inventors: Wolfgang Dennstedt; 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: EP2043863A1; DE102006032263B3

Abstract

The invention relates to a device for clamping a flexible printing blanket on an impression cylinder. Said device comprises a) a clamping channel (1a-1f) having a first clamping surface (1c) for a leading bent section (3) of the printing blanket (2) and a second clamping surface (1d) for a trailing bent section (5) of the same or an additional printing blanket (4), said second surface being opposite in the circumferential direction of the impression cylinder (1) at a distance, b) a first clamping element (11; 21; 31) which defines with the first clamping surface (1c) a clamping gap (F) for the leading bent section (3), c) a second clamping element (12; 22; 32) which defines with the second clamping surface (1d) a clamping gap (F) for the trailing bent section (5), d) the clamping elements (11, 12; 21, 22; 31, 32) being axially off-set from each other in the clamping channel (1a-1f) and overlapping each other in the circumferential direction (V) in the region of the clamping gap (F).

Description

Clamping device with overlapping clamping means

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.

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 means are guided radially to the shaft movable each in a sliding contact and with respect to the shaft radially outward against a Klemmfiäche with a Spring force to be applied. With the clamping device, the protrusions projecting into the channel are clamped on the same side of the channel on each other. The impression cylinder is set to a specific direction of rotation due to the shape of the clamping channel and its clamping device.

Another example of a clamping device with successive clamped offends, but with a pressure cylinder invariant with respect to the direction of rotation teaches the US 5,010,818 B.

US 4,577,560 B teaches a clamping device with a clamping means, which simultaneously clamps two in the clamping channel projecting lugs on opposite sides of the clamping channel. Although the two clamped bridges are not adjacent to each other, the clamping of one abutment is nevertheless dependent on the clamping of the other.

The DE 10 2005 029 167.8 has a clamping device to the object, which has in relation to the direction of rotation of the printing cylinder leading and trailing clamping nips forming clamping means in the clamping channel. With the leading clamping devices, a provisional Fender Abbug on one side of the clamping channel and the trailing clamping means a trailing Abbiegel is clamped on the other side of the clamping channel. By assigning the leading clamping means for advancing Abbug and the trailing clamping means for subsequent Abbug the bends can be clamped independently. The pressure cylinder equipped with the clamping device is also rotational direction-invariant. However, the clamping device requires space in the circumferential direction of the printing cylinder in the region of the clamping gaps.

It is an object of the invention to provide a clamping device in a clamping channel with a narrow channel opening.

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 first clamping means and at least one further, second clamping means which are axially offset from one another in a clamping channel of the printing cylinder. The clamping channel has a first clamping surface for a leading down of the pressure pad and a second clamping surface for a trailing Abbug the same or another pressure pad. The clamping surfaces face each other in the circumferential direction of the printing cylinder at a distance and are preferably flat or planar. Their surface normals may point obliquely to each other, but are preferably parallel, ie that preferably also the clamping surfaces are parallel to each other. The first clamping means forms with the first clamping surface a clamping gap for the leading Abbug, and the second clamping means forms with the second clamping surface a clamping gap for the trailing Abbug. The clamping means thus act only on one of the two turns. Preferably, two walls of the clamping channel which are spaced apart from one another in the circumferential direction of the printing cylinder, ie walls delimiting the clamping channel, form the two clamping surfaces. The Druckyzlinder forms in such embodiments even directly the clamping surfaces. In principle, however, it would also be possible for one of the clamping surfaces or optionally also both clamping surfaces to be formed by one or more bodies or bodies arranged in the clamping channel. According to the invention, the clamping means overlap one another in the circumferential direction of the printing cylinder at least in the region of the clamping gaps. The indication, in the region of the clamping gap, means that there is an overlap at the radial height or possibly different radial heights of the clamping gaps or at least close to the clamping gaps, wherein the radial height is the radial distance from the axis of rotation of the printing cylinder. The clamping means overlap each other at least with a greater part of their measured thickness in the circumferential direction, they preferably overlap each other with the majority of their thickness. The clamping means or at least the areas of the clamping means which form the clamping gaps, overlap each other in particular, if no pressure pad is clamped, so no turning in one of the clamping gaps of the overlapping clamping means projects. Due to the overlap, the leading and trailing clamping surfaces may be particularly close together in the circumferential direction of the impression cylinder, or the clamping means may be made thicker and stiffer at a given distance of the clamping surfaces than would be possible if the clamping means between the clamping surfaces in the circumferential direction without overlapping side by side on the same axial height of the printing cylinder would be arranged.

A wall of the clamping channel, which forms one of the clamping surfaces, advantageously extends up to an opening of the clamping channel located on the outer circumference of the printing cylinder at least substantially radially 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 similar channel wall, which forms the other 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-section with respect to a radial to the axis of rotation of the pressure cylinder shape of the region of the clamping channel extending from the two clamping surfaces to the channel opening, is also already advantageous if the two channel walls do not extend parallel to each other, as such Clamping channels with corresponding clamping devices invariant in relation to the Direction of rotation of the printing cylinder, so that the pressure cylinder can be operated both clockwise and anti-clockwise.

In a preferred first embodiment, a first clamping piece forms the first clamping means and a second clamping piece forms the second clamping means. Each of the clamping pieces is acted upon by a spring member with a spring force which presses the respective clamping piece in the direction of the associated clamping surface. Preferably, separate spring members are provided for the clamping pieces, d. H. each one of the spring members acts only on one of the clamping pieces. In particular, the clamping pieces and the spring members are separate parts. The clamping pieces are preferably in one piece, whereby a multi-piece clamping piece could find application. However, it should not be ruled out in principle that a single spring member acts on both clamping pieces, each with the spring force. The spring member or the plurality of spring members is or are preferably also arranged in the clamping channel, but could (n) in principle also be arranged outside the clamping channel and act from there on the clamping pieces. In any case, the respective spring force biases the clamping pieces in the direction of the respective clamping surface. Prior to insertion of the bends, the spring force preferably biases the clamping piece against the clamping surface, i. prior to insertion of the Abbug the clamping pieces are preferably in contact with the respective clamping surface. Preferably, the clamping pieces on a flat, in particular to their respective associated clamping surfaces in approximately parallel surface, between which and the clamping surface of the clamping channel a Abbug is einstechbar. The clamping pieces are stiff in relation to their clamping function, at least one of the clamping pieces possibly existing elasticity against the elasticity of the spring or the members are neglected. By the production of the clamping pieces as in this sense rigid body, the distance that the respective clamping gap of a located on the outer periphery of the pressure cylinder edge of the clamping channel can be precisely specified. An exact adherence to a desired distance to the edge is desirable because the side register of each pressure pad to be clamped is advantageously set before clamping.

In a first variant, the clamping pieces contact with an outer surface depending on an associated, formed in the clamping channel bearing. The two bearings store the associated each of the clamping pieces tilted. As far as below only to one of the clamping pieces and this clamping piece associated bearing point are made, the comments apply to the other of the clamping pieces and the associated bearing point in the same way. 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, but with respect to a line contact is preferred, the bearing point and the clamping piece to each other congruent bearing surfaces, which have a Tilt angle of preferably at most 30 ° a sliding pair, ie form 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, but preferably only so much that, despite unavoidable manufacturing tolerances, the Kippbeweglichkeit is ensured by the minimum tilt angle. For the tilting bearing it is sufficient and corresponds to preferred embodiments, when the clamping piece with the bearing point is only in pressure contact.

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.

In a second variant, in which the clamping means are also rigid clamping pieces, the clamping pieces are mounted linearly movable in the clamping channel and are each acted upon by a spring force in the direction of the respective associated clamping surface. Preferably, they are linearly guided directly by walls of the clamping channel, preferably linear and non-rotatable.

The clamping pieces preferably each have 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 printing cylinder or the linear movement along a translation axis. The tilting axis of the first variant preferably extends in or near the region of the contact, in the case of In the most preferred embodiment of the line contact, it coincides with the line of contact 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. The translation axis, along which the linearly movable clamping pieces of the second variant are movable, preferably extends at right angles to a radial which extends from the axis of rotation of the printing cylinder through the opening of the clamping channel. If the axis of mobility of the respective linearly moveable clamping piece is not perpendicular to said radial, it should enclose an angle of at most 50 ° with a straight line pointing at right angles to this radial line.

The clamping pieces of both variants have in preferred embodiments depending on a bearing portion and a protruding from the bearing portion, in the cross section of the printing cylinder in comparison with the bearing portion narrow finger. The finger forms the clamping gap, and the bearing portion is advantageously used for mounting in the channel, ie the tilting bearing or linear bearing of the respective clamping piece. 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 fastening means, wherein z. B. 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. As an alternative to such a fastening, adjacent pairs of first clamping pieces and second clamping pieces, preferably a single first clamping piece and a single second clamping piece, can each support one another via a respective spring element, so that an additional fastening in the clamping channel is not required. Also in this alternative, the spring member may be surrounded by the clamping piece. Such a support is particularly suitable for the linearly movable clamping pieces, but in principle is also suitable for tiltable clamping pieces, although for these rather the described separate storage and loading consolidation is preferred. For the two variants is generally preferred that the preferably one-piece clamping pieces z. B. with its bearing portion on the printing cylinder, in particular the filler, are stored, such as. B. in engagement with the printing cylinder or are guided by the printing cylinder.

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.

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.

In a preferred second embodiment, the clamping means are elastic as such, d. H. elastic in itself. The clamping means may for example be made of an inherently elastic material, for example an elastomer or natural rubber. More preferably, they are form-elastic. Optionally, formula elasticity and material elasticity of significance may also be realized cooperatively. Clamping spring tongues are preferred form-elastic clamping means. With elastic clamping means, the costs incurred by the clamping device of the printing cylinder can be reduced. Furthermore, since separate clamping pieces and spring members need not be provided separately from each other, the clamping channel can be shaped more simply in cross-section. Thus, it corresponds to particularly preferred embodiments, when the clamping channel is formed overall only as a narrow clamping slot, with plane-parallel side walls which form the clamping surfaces in a radially outer, the channel opening near area and store the clamping means in a radially inner region near the channel bottom area by they form the abutment there, in which the clamping means are supported during clamping.

The clamping spring tongues preferably run together in a common connection region with axial offset. The connection region is arranged close to the channel bottom or at least between the channel base and the clamping gaps, so that the clamping spring the tongues from the connection area in the direction of the channel opening and the respective clamping gap protrude. To obtain the overlap, the clamping means intersect each other between the connecting region and the clamping gaps. Preferably, they form an "X", advantageously an elongated "X", seen in the cross-section of the clamping channel between the connection region and the clamping gaps, wherein the two intersecting clamping spring tongues are of course axially offset from one another.

The clamping spring tongues are advantageously made of spring steel.

It is advantageous if at least one first clamping means and at least one second clamping means are formed in one piece and protrude from a connecting region in the direction of the respective clamping gap. Spring steel tongue-shaped clamping spring tongues can in particular be formed by a bending process from the same spring steel sheet piece, so that the common connecting region forms an arc around a longitudinal axis of the clamping channel.

Although it is sufficient if only one clamping gap is formed over the axial length of a bend, ie only a single first and a single second clamping means are provided, it is preferred if two or possibly more axially spaced clamping gaps are formed for each bend and clamping means are arranged in a corresponding number in the clamping slot. The per Abbug provided clamping means are advantageously connected to each other via a connecting structure. The connection of the clamping means with the connecting structure may be, for example, a screw or rivet connection or in particular a latching connection. In a variant, the per-turn clamping means, i. the clamping means arranged between each two adjacent register members, and the respective connecting structure formed in one piece, so that the connecting structure forms said connecting region per pair of clamping means.

Due to the overlap according to the invention, in the preferred extreme case, the entire or at least the predominant part of the width of the clamping channel can be utilized for the compression of each individual clamping means. In the preferred embodiment of the clamping means each as a clamping spring tongue protrudes one of the clamping means on a trailing side and the other of the clamping means on a leading side of the clamping channel seen from the channel base in the direction of the opening of the clamping channel. The first clamping means preferably protrudes from the trailing side of the clamping channel in the direction of the leading channel wall, and the second clamping means preferably protrudes from the leading side of the clamping channel in the direction of the trailing channel wall, so that the two clamping means between the channel bottom and each formed Cross clamping nip with axial offset.

The clamping means advantageously form an insertion funnel for each turn to be clamped, so that the respective turn can be slidably guided on a side of the respective clamping means facing the channel opening to the respective clamping gap and inserted into the clamping gap against the spring force on the funnel base. If the clamping means are as preferred clamping spring tongues, the clamping means can each protrude from the channel bottom first in the direction of the respective clamping gap and protrude seen from the slot bottom behind the nip again in the direction of the channel opening and on the opposite channel wall. Advantageously, the clamping means each have a kink, with which they form the respective clamping gap, so that in the nip at least substantially only line contact exists. If the clamping means in each case form an insertion funnel, the respective insertion funnel is preferably extended so far to the opposite channel wall, that the clamping means in cross section cross each other at the level of the insertion funnel, i. overlap.

In a first variant, the clamping means protrude from the respective nip with an inclination in the direction of the opposite clamping wall, but do not contact them, d. H. neither with inserted Abbug and certainly not with not plugged Abbug. The clamping means thus spring free in all operating conditions of the clamping and register device between the nip and a deeper located in the nip support point. They form advantageously in the relevant section an elastically bendable bending beam.

In a second variant, the clamping means protrude from the respective clamping gap with an inclination up against the opposite channel wall. As a result of the contact, a support point is formed on the opposite channel wall during compression of the respective clamping means. hold. The clamping means each form one of the one support point to the other extended bridge. It is also advantageous if the contact already exists prior to the insertion of the Abbuckenden Abbug, since in this way can be the safest prevented that the Abbug behind the clamping means, ie between the clamping means and the opposite channel wall, can thread. In comparison with the freely deflectable bending beam of the first variant, the two bending legs of the second variant are preferably more yielding, so that as a result an at least substantially equal clamping force is obtained as with the clamping means of the first variant.

The clamping means, ie the rigid, as a whole movable clamping piece or the resilient clamping means, preferably forms only a single axially narrow nip. 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 means with a single narrow nip is preferable in view of the precise specification of the location of the nip a wide nip or a wide clamping means with side by side two or more nips, as it becomes increasingly difficult with increasing width, the tilt axis exactly the place and according to their orientation. The same applies to the translation axis of the second variant with stiff clamping means. For the as such elastic clamping means the explanations to the width also apply. The precision is also conducive if provided for generating the spring force in the first embodiments, only one of the respective clamping piece associated, ie acting on the clamping piece spring member, preferably arranged 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 a plurality of clamping pieces, each of the clamping pieces is supported independently of the other and subjected to a spring force, are advantageously used in combination, but are Alone already advantageous, furthermore without the invention claimed here, the tangential overlap, ie the overlap in the circumferential direction.

The clamping device is preferably formed substantially symmetrically with respect to the clamping means 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 first embodiments, however, from the fact that the clamping pieces are mounted for the one or more leading Abbug or Abbüge and the clamping pieces for the or the trailing Abbug or Abbüge on the same side of the clamping channel, the However, each spring force is applied in different directions, preferably in opposite directions to the two types of clamping pieces. The mounting of both types of clamping pieces on the same side of the clamping channel, i. seen on the same side in the circumferential direction of the printing cylinder, simplifies the manufacture and assembly and reduces the space requirement, whereby the printing cylinder is also least weakened. In likewise preferred second embodiments, the clamping device is preferably completely symmetrical, apart from the axial displacement of the elastic clamping means as such with respect to a cylinder axis of rotation radial axis extending through the opening of the channel.

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 single-circumference form cylinder, in particular a single continuous channel and a double-circumference form cylinder, can pass through two continuous channels with an offset. have 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, embodiments of the invention will be explained with reference to figures. The features disclosed in the exemplary embodiments, each individually and in any combination, advantageously further extend the subjects of the claims and also the embodiments described above, insofar as a feature of one embodiment does not preclude a feature of another. Show it:

1 shows a clamping channel with a clamping device of a first embodiment in a cross section,

2 shows the clamping channel with the clamping device of the first exemplary embodiment in another cross section,

3 shows a clamping channel with a clamping device of a second embodiment in a cross section,

FIG. 4 shows a first clamping piece of the second exemplary embodiment,

FIG. 5 shows a second clamping piece of the second exemplary embodiment,

FIG. 6 shows a form cylinder with a clamping channel for a clamping device of a third exemplary embodiment,

Figure 7 shows the clamping channel with a first variant of the clamping device of the third

Embodiment in a cross section,

8 shows a clamping unit of the first variant of the third embodiment,

9 shows the clamping device of the first variant of the third embodiment in a perspective view,

FIG. 10 shows a register member of the third embodiment, FIG. 11 shows the clamping channel with the clamping device of the third exemplary embodiment in a further cross section,

Figure 12 shows a second variant of the clamping device of the third embodiment in perspective and

13 shows a pair of first and second clamping means of the second variant of the third exemplary embodiment.

Figures 1 and 2 show in a first exemplary embodiment, a forme cylinder 1 of a web-fed rotary offset printing press for newspaper printing in each case a different cross-section. The form cylinder 1 has a double circumference, i. on the circumference of the forme cylinder 1 two printing plates 2 and 4 are arranged in the circumferential direction one behind the other and clamped by means of 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 rotational and circumferential direction 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 bends 3 and 5 are bent to the resting on the circumference of the forme cylinder 1, adjoining the turn 3 or 5 area of the respective printing plate 2 or 4 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 11, 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. In Figure 1 is one of the first clamping pieces 1 1 and in Figure 2 one of the second clamping pieces 12 is shown. 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. Each printing forme 2 and 4, two first clamping pieces 1 1 for the leading Abbug 3 and two second clamping pieces 12 are provided for the trailing Abbug 5. Each of the clamping pieces 11 and 12 each forms only a single nip F. The clamping pieces 1 1 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 1 1 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 1 a, through which the bends 3 and 5 protrude into the clamping channel. The channel opening Ia is followed by a leading channel wall Ic and a trailing channel wall Id. The clamping pieces 1 1 form with the leading channel wall Ic each have 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 Id. The channel walls Ic and Id thus form the mating surfaces or clamping surfaces for the clamping pieces 11 and 12. The channel walls Ic and Id 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 1. Since they are spaced only a few millimeters apart, can They themselves, to a good approximation, also be referred to as axial / radial planes. In the exemplary embodiment, they extend radially inward even a little way beyond the respective nip F addition to each other plane-parallel. Radially inwardly from the narrow gap between the channel walls Ic and Id, the clamping channel opens to a receiving space for the storage and mounting of the clamping pieces 11 and 12th The clamping pieces 11 are equal to each other, and they are mounted in the same way and movably mounted for clamping. Designs only one of the clamping pieces 1 1 thus apply equally to the other clamping pieces 1 1. 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 its 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 Ic and Id protrudes. The finger 14 forms with the channel wall Ic the nip F. The finger 14 tapers from the nip F in the direction of the channel opening Ia, 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 can be tilted in the cross-sectional plane about a tilting axis K as a whole. The tilting axis K is formed by a pressure contact of the clamping piece 11 with a bearing point, in the 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 Ib of the receiving space. The channel wall Ib forms a bottom or bottom of the clamping channel. In the channel wall Ib is axially continuous recess 18, in the embodiment, a rectangular groove, incorporated. The bearing is formed by one of the two outer edges of the recess 18. 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 11 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 Ic. The spring member 7 is a loaded on compression coil spring. Each of the clamping pieces 1 1 is assigned its own spring member 7, which acts only on the associated clamping piece 1 1 respectively. 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 Ic. An inclination would be less preferred, but still possible. The force exerted by the spring member 7 on the clamping piece 1 1 spring force acts substantially in the same direction as the pressure exerted by the clamping piece 1 1 on the bearing pressure. The clamping piece 11 contacts the bearing point with an outer surface which points in substantially the same direction as that surface with which the clamping piece 1 1 forms the clamping gap F. However, this does not mean that the two surfaces in question, namely the clamping surface and the bearing surface of the clamping piece 1 1, plane-parallel or only be 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 on the one hand, the bearing surface of the clamping piece 1 1 are pressed against the bearing point of the clamping channel and the clamping surface of the clamping piece 1 1 in the direction of the clamping surface formed by the channel wall Ic.

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 Ic 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 1 1 and presses the clamping piece 1 1 in the direction of its spring axis and thus the finger 14 in the direction of the channel wall Ic, whereby the clamping 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 clamps 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 from the tilting axis K to the Clamping gap F extending, conceived as a straight line tilting lever between the tilting axis K 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 1 1 it is preferred that it is the edge of the depression 18, which forms the tilting bearing for the clamping piece 1 1, engages 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 1 1, 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 K and the nip F in the clamping piece 1 1, 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 radial inner edge of the channel wall 1 c.

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 outwardly from the radially outer leg of the bracket, and the projection 16 projects radially inwardly from the inner leg of the bracket. 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 K is therefore formed at least to a good approximation radially below the clamping gap F. Accordingly, the rocker arm between the tilting axis K and the nip F extends in straight extension of the channel wall 1 c, 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 Ic when inserting the Abbug substantially tilts right angle away.

The bearing portion 13 is enclosed in the receiving space between two radially opposite walls Ie 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 channel wall Id 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 channel wall Ic. The walls forming the receiving space Ie are preferably approximately perpendicular to the channel wall Ia, ie, for example, with a tolerance of about ± 20 °, more preferably ± 10 °. The walls Ie are advantageously parallel to each other. Furthermore, the bearing portion 13 in its bow portion to its side facing away from the finger 14 side, ie towards a channel wall If, tapers, so that the bracket can not hinder the tilting movements. The channel wall If is preferably approximately parallel to the channel wall Id or Ic and, alternatively or additionally, approximately perpendicular to the walls Ie.

The mounting bolt 9 is bordered by the web 15 of the clamping piece 1 1. 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 1 e and on the other the enclosure of the mounting bolt 9 are realized in combination in the embodiment. 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 11, namely at the filler 8, the finger 14 of the clamping piece 12, however, forms the clamping gap with the opposite, trailing channel wall 1 d, the spring member 7 can directly on the channel wall If support. 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 1 first

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 of the clamping pieces 11 is close to one of the clamping pieces 12 ordered, 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 11 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 Ic and Id, in the sense of maximum rigidity of the clamping pieces 1 1 and 12 used.

By also the Lagerab sections 13 overlap each other in the circumferential direction V, space is saved, also required for the creation of the clamping device material removal at the periphery of the printing cylinder 1 is kept low.

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 11 are tilted in the region of the respective opposite recess 6 to almost against the channel wall Id. This measure also helps that the fingers 14 are as thick as possible and thus the clamping pieces 1 1 and 12 can be performed as stiff as possible. Conversely, the channel walls Ic and Id can move very close to each other and the channel opening Ia can be 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 form 2 is attached at the relevant end. lifted and thereby the Abbug 3 pulled out of the nip F. Once the free front end of the Abbugs 3 has passed the nip F, tilts the clamping piece 1 1 due to the spring force against the channel wall 1 c. 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. For example, assume that it is introduced with the turn 3 in the clamping channel Ia-If. 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 turn 3, and also the other turns of the printing plates 2 and 4, has a height measured along the channel wall Ic of preferably at most 10 mm, more preferably at most 9 mm. When inserted into the clamping channel Ia-If, it firstly engages with a register device arranged in the clamping channel for the lateral alignment of the printing plates 2 and 4. The register device comprises at least one register cam, preferably exactly one register cam, per printing form 2 and 4 in a conventional manner for the setting of the page register. The printing form 2 passes only after the successful in this way adjustment of the side register in the nip F, d. H. only the frontmost area is available for clamping the abutment 3. It is therefore all the more important that a desired distance between the peripheral edge of the clamping channel and the clamping gap F is maintained as accurately as possible. This is ensured by the inventive tilting bearing of the clamping pieces 1 1 and 12. Another advantage, in particular with regard to an automatic printing plate change, is the free tilting movement during insertion against and during withdrawal supported by the spring force.

Figure 3 shows a clamping channel with a clamping device according to a second embodiment. Figures 4 and 5 show in cross section, each individually a first clamping piece 21 and a second clamping piece 22 of the second embodiment. The clamping pieces 21 and 22 are formed as in the first exemplary embodiment as a rigid body. In contrast to the clamping pieces 1 1 and 12 of the first embodiment, the clamping pieces 21 and 22 of the second exemplary embodiment are only linear, along a translation axis movable back and forth. They are guided in the clamping channel of channel walls Ie.

The clamping channel is with respect to its channel opening Ia and the adjoining clamping area, d. H. the area of the channel walls Ic and Id, as formed in the first embodiment. Radially inwardly of the clamping region, the clamping channel also has a receiving space for bearing portions 23 of the clamping pieces 21 and 22, as in the first embodiment. However, the receiving space in the second embodiment does not form a tilting bearing, but rather a linear guide for the bearing sections 23. The linear guide is formed by two opposing channel walls Ie, which surround the bearing sections 23 and guide them along the respective translational axis. The translation axes of the clamping pieces 21 and 22 span a common plane parallel to the axis of rotation of the forme cylinder 1. The plane, d. H. the translation axes, is or are inclined to the radial R, which extends from the axis of rotation of the forme cylinder 1 through the channel opening 1 a, inclined. With respect to the circumferential direction V locally at the channel opening 1a, the inclination is about 15 °. Accordingly, there is an inclination of about 75 ° with respect to the planar channel walls Ic and Id.

As shown in Figures 4 and 5, the clamping pieces 21 and 22 are formed in cross section in approximately the same as the clamping pieces 1 1 and 12 of the first embodiment. In particular, they likewise each include a bearing section 23 and a finger 24 which rises in the direction of the channel opening 1a. The finger 24 corresponds to the finger 14 of the first exemplary embodiment, in particular it is tapered away from the respective clamping gap F in order to provide a bend for the bend to be clamped Insertion funnel to form.

The bearing portions 23 of the clamping pieces 21 and 22 serve as already mentioned not the tilt bearing, but the linear bearing of the clamping pieces 21 and 22. Another difference from the first embodiment is that the spring force with which the fingers 24 against the associated channel wall Ic or Id be pressed between the clamping pieces 21 and 22 acts. FIGS. 4 and 5 show the clamping pieces 21 each with a spring However, for a pair of closely spaced clamping pieces 21 and 22 together only a single spring member 7 is provided. The spring member 7 is a tensioned spiral spring, which is supported in a direction of the translation axis on the clamping piece 21 and in the other direction on the clamping piece 22. The clamping piece 21 is guided directly from the channel walls Ie, while the clamping piece 22 is guided only on one of the channel walls Ie and the rest of the clamping piece 21. The spring member 7 is received in a bore of the bearing portion 23 of the clamping piece 21 and disposed axially adjacent to the bearing portion 23 of the clamping piece 22.

Figure 6 shows a form cylinder 1 in a perspective view of a clamping channel which is formed over its entire depth as a narrow clamping slot and in the longitudinal direction of the forme cylinder 1, i. extends parallel to the axis of rotation D of the forme cylinder 1, continuously from one end face of the cylinder bale to the opposite end face. The clamping slot has on the circumferential surface of the forme cylinder 1 from a front end to the front end of the cylinder bale axially straight slot opening Ia with two axially parallel edges. The slot opening 1 a is penetrated only locally by extensions 1 i. In the circumferential direction is offset by 180 ° on the circumference of the forme cylinder 1, another identical clamping slot formed. The forme cylinder 1 is assignable along the axis of rotation D with a plurality of printing plates. In the exemplary embodiment, it has an axially measured width of four single-width printing plates, preferably printing plates in one of the customary newspaper formats. The forme cylinder 1 has a double circumference, so that in the circumferential direction behind two printing forms can be placed and with its with respect to the direction of rotation of the forme cylinder 1 leading and trailing turns in one of the two clamping slots inserted and clamped in the respective clamping slot.

Figure 7 shows the clamping slot in a cross section with inserted clamping device.

The two opposite sides of the clamping slot are bounded by plane-parallel to each other extending side walls Ic to If. In a first approximation, the clamping slot with the exception of the extensions Ii in cross-section throughout a schmanle rectangular shape. Strictly speaking, the clamping slot in cross-section not simply in the form of a narrow rectangle, but has two different depth ranges, each of which, however, has the form of a longitudinally elongated rectangle in itself. A central vertical axis of the clamping slot extends through the slot opening Ia parallel to the side walls of the clamping slot and through the slot bottom Ib up to the axis of rotation D of the forme cylinder. The vertical axis of the clamping slot thus coincides with a radial R on the axis of rotation D. The clamping slot could also be offset a little bit to the radial in the circumferential direction to the left or right, so that the radial extends in the plane of one of the side walls of the clamping slot or laterally a little further to the slot offset. The clamping slot on the opposite side of the forme cylinder 1 would have to be correspondingly offset in such a case in order to obtain the subdivision of the cylinder circumference into 180 ° circumferential sections.

In FIG. 7, it is assumed that the forme cylinder 1 rotates in the clockwise direction, as indicated by the direction of rotation arrow V. The clamping slot is limited in its outer, reaching to the slot opening Ia depth range of two side walls Ic and Id, seen in the circumferential direction V at the location of the slot opening Ia, facing plane-parallel and are therefore parallel to the radial R. In an inner depth region, which extends to the slot bottom Ib or to close to the slot bottom Ib, the clamping slot is also bounded by two plane-parallel and parallel to the radial inner side walls 1 e and 1 f. The inner side walls 1 e and 1 f go in a single step in the two outer side walls Ic and Id. The two steps each form a shoulder Ig on one side and Ih on the other side of the clamping slot, at least substantially at right angles to the side walls Ic to If. The clamping slot has a first slot width s' in the inner depth range, ie between the side walls Ie and If, and a second slot width s in its outer depth range, ie between the side walls Ic and Id. The slot width s is slightly larger than the slot width s'. The slot width s and s 'are selected in the range of a few millimeters, the difference of the slot width s and s' is in the range of a few tenths of a millimeter. For example, the slot width s may be between 2 and 3 mm and the slot width s' may be smaller by 0.2, 0.3 or 0.4 mm or an intermediate dimension. The slot depth measured by the slot opening 1a on the slot bottom 1b is preferably a few centimeters, while For example, about 3 cm. The outer side walls Ic and Id extend from the slot opening Ia to the respective shoulder Ig or Ih over a depth of preferably at most 35 mm, in the exemplary embodiment the depth of the outer depth region is 10 mm. The side walls Ic and Id go in the region of the slot opening Ia with a small radius of curvature of, for example, about 0.5 mm in the peripheral surface of the forme cylinder 1 over.

The extensions Ii are circular bores which extend up to the peripheral surface of the forme cylinder 1, ie pass through the slot opening 1a. The extensions Ii are also a little deeper than the clamping slot between the extensions 1 i. At the bottom of each extension Ii, as seen in the extension of the respective extension Ii, a hole Ik is formed from the slot opening 1a, which, like each extension Ii, extends along the vertical axis of the clamping slot. The holes Ik serve each of the attachment of a mounting bolt. In the exemplary embodiment, the holes Ik threaded holes.

In the clamping slot, a clamping device of a third embodiment is arranged in a first variant, of which in the cross section of Figure 7, a first clamping means 31 and a second clamping means 32 can be seen. The clamping means 31 and 32 are spring clips spring steel sheet. The thickness of the spring steel sheet is at most half, more preferably at most one third of the slot width s. The first clamping means 31 forms with the leading side wall Ic a nip F for the leading Abbug 3 a printing form 2. The second clamping means 32 forms with the trailing sidewall Id a nip F with the trailing Abbug 5 another printing plate 4. The outer side walls Ic and Id are hereafter referred to as clamping surfaces for the clamping means 31 and 32 because of their function as clamping walls Ic and Id.

The clamping means 31 and 32 are axially offset from each other and overlap each other in a direction to the clamping walls 1 c and 1 d at right angles direction, which due to the at least substantially radial orientation of the clamping walls 1 c and 1 d with the circumferential direction V on Location of the slot opening Ia coincides. The bends 3 and 5 are at the points where they with the respective non-clamping clamping means 31 or 32 in the axial Overlapping, each provided with a recess 6, so that they can not get in contact with the respective non-clamping clamping means 31 or 32. In the cross section of FIG. 7, the first clamping means 31 clamps the leading turn 3 and lies opposite the recess 6 of the trailing bend 5.

The clamping means 31 and 32 structurally form a clamping unit in that they are formed in one piece, in the exemplary embodiment by a bending process. They run together from the slot opening Ia with axial offset in a connecting region 33 together. The connection portion 33 is disposed between the inner side walls Ie and If near the slot bottom Ib. At its end facing the slot bottom 1b, the connecting region 33 describes a 180 ° bend, which merges into two parallel legs in the direction of the slot opening 1a. The parallel legs press against the inner side walls Ie and If, so that between the side walls Ie and If and the connecting portion 33 is a frictional engagement. The clamping means 31 and 32 project from the connecting portion 33 in the direction of the slot opening Ia from the region of the inner side walls Ie and If out in the region of the clamping walls Ic and Id. The first clamping means 31 protrudes from the trailing side of the clamping slot with continuous curvature in Direction to the leading edge of the clamping wall formed Ic clamping gap F, and the second clamping means 32 protrudes from the leading side of the clamping slot also with continuous curvature in the direction of the trailing clamping wall Id formed clamping gap F. In the region of the respective clamping gap F buckle the clamping means 31 and 32 to the respective opposite clamping wall Id or Ic from. Because of the buckling in the region of the clamping gap F, at least substantially line contact is obtained there.

The projecting from the respective nip F outer ends of the clamping means 31 and 32 form for the associated Abbug 3 or 4 respectively an insertion funnel along which the associated Abbug 3 or 5 during insertion into the clamping slot inwardly towards the respective nip F slides and is guided during insertion into the respective associated nip F. The free outer ends of the clamping means 31 and 32 can advantageously, but need not, protrude through the respective recess 6 of the opposite Abbugs 5 or 3 up against the respective opposite clamping wall Id or Ic and are supported there. The clamping wall Id and the inner sidewall If form in When inserting the Abbugs 3 in the nip F springs the first clamping means 31 in the region of its two legs, namely on the one leg between the nip F and the free end of the clamping means 31 and Others in the region of the leg between the nip F and the connecting portion 33. If the first clamping means 31 in the region of its free outer end with the clamping wall Id has no contact, but this does not correspond to the preferred embodiments, the clamping means 31 springs only in the region of Leg between the connecting portion 33 and the nip F a. For the second clamping means 32 applies mutatis mutandis to the same with respect to the two possibilities of compression, only with reversed sides of the clamping slot.

FIG. 8 shows the complete clamping unit of FIG. 7 in a perspective view. The clamping unit is molded in one piece from spring steel sheet. The clamping unit has a total of two first clamping means 31 and two second clamping means 32, each forming an axially short clamping gap F. A connecting structure 33, which also locally forms the connecting region 33, extends approximately over the entire axial width of the bends 3 and 5. It has the shape of an axially elongate, at right angles to the clamping walls Ic and Id thin rail and connects the two Clamping means pairs 31, 32 with each other. The connecting structure 33 is formed over its entire length as a slim U-profile, as already in the cross section of Figure 7 for the local connection region 33 can be seen. Depending on one of the clamping means 31 and one of the clamping means 32 are arranged in the immediate vicinity with only slight axial displacement along the connection structure 33. Between the spatially formed in this way pairs of clamping means 31 and 32 there is a greater distance, so that the bevels 3 and 5 are clamped at two axially spaced locations. The connecting structure 33 has at its two axial ends depending on the slot bottom Ib facing recess, so seen from the slot base Ib from the two recesses each an axially projecting engagement portion 34 is obtained for engagement with register members.

Figure 9 shows the further developed to a clamping and register device clamping device in a perspective view. Shown are one of the register members and the two left and right adjacent clamping units, of which, however, only about one axial half can be seen. Also entered is the section line VII-VII of FIG. 7.

FIG. 10 shows one of the register members released from the composite, likewise in a perspective view. The arranged in the clamping slot register members are identical, so that in the following always only one representative is also described for the others.

The indexing member comprises three axially arranged side by side, formed in one piece functional sections, namely a central mounting portion 40, an axially leftward projecting engagement portion 41 and an axially projecting rightward further engagement portion 41. The two engagement portions 41 project mirror-symmetrically to the vertical axis of the clamping slot of the mounting portion 40 off. The mounting portion 40 is hollow cylindrical with a circular cylindrical outer peripheral surface and a through hole 44 extending along the vertical axis of the clamping slot for a mounting bolt 45. The through hole 44 is formed as a slot. The long axis of the cross section of the bore 44 extends in the longitudinal direction of the clamping slot. The engaging portions 41 protrude axially from the central mounting portion 40 from a wing-shaped. They are essentially plate-shaped. The mounting portion 40 is added in the installed state in one of the extensions Ii. The engaging portions 41 protrude out of the extension Ii between the side walls Ic to If of the clamping slot. At the upper ends of the engagement portions 41 in FIGS. 7 and 8, a register cam 42 is formed. The register cams 42 are respectively slightly thicker than the remaining portion of the respective engagement section 41. The engagement sections 41 are shaped in the region of the respective register cam 42 to the outer depth region and in their respective remaining region adapted to the inner depth region of the clamping slot, so that the register cam 42 with little play between the clamping walls Ic and Id and the remaining area of the engagement portions 41 between the inner side walls Ie and If are performed with a slightly larger game contrast. The engagement portions 41 are further provided in each of the region which is arranged between the inner side walls Ie and If, each having a recess 43 which opens to the respective axial end side, so that in the recesses 43 each one of the engagement portions 34 of the connection structure 33 can intervene. The register cam 42 project beyond the mounting portion 40 in the direction of the slot opening Ia and engage in register recesses 10 of the bends 3 and the bends 5, not shown in Figure 9, which are respectively formed on the lateral edge of the printing plates 2 and 4. Shown is also the positive engagement of the two connection structures 33 and the register member 40-44, namely the respective engagement portion 34 in one of the two recesses 43 of the register member 40-44. In the engagement region, the register member 40-44 overlaps the connection structures 33 only in their engagement portions 34, wherein the overlap on the side of the register member 40-44 is only in the area of the engagement portions 41. The overlap takes place in the axial direction and at right angles to the side walls Ic to If. In the region of the respective overlap, however, there is no overlap along the vertical axis of the clamping slot, ie an overlap exists parallel to the side walls 1 c to If only in the axial direction. That there is no overlap along the vertical axis is intended to mean that the thickness of the overlapping portion measured perpendicular to the side walls Ie and If is at most as large as the maximum thickness of either the connecting structure 33 or the engaging portions 41. This type of overlap minimizes the space required for the intervention perpendicular to the side walls Ic to If, so that even the small slot width s' is sufficient for the positive engagement.

The register member 40 is axially adjustable relative to the forme cylinder 1 and the two adjacent clamping units 31-34 in order to adjust the side register of the printing plates 2 and 4 can. The adjustment takes place between the mounting bolt 45 and the register member 40-44. The mounting bolt 45 is a screw bolt which is screwed along the vertical axis of the clamping slot in the existing at the bottom of the extension Ii bore Ik. To adjust the side register, the mounting bolt 45 is slightly loosened so that the register member 40-44 can be axially displaced relative to the mounting bolt 45. After the axial position of the register member 40-44 has been adjusted with a gauge, the mounting bolt 45 is tightened again and the register member 40-44 thereby fixed in the set position. The engagement of the register member 40-44 with the clamping units 31-34 has in the axial direction "air", which slightly exceeds the length of the possible displacement of the register member 40-44. The maximum adjustment can be, for example, 1 to 2 mm. In the adjustment, the register member 40-44 is especially in the region of its two register cam 42 between the clamping walls Ic and Id out.

Figure 1 1 shows the register member in the registered in Figure 9 cross-section XI-XI. It can be seen that the free ends of the clamping means 31 and 32 protrude slightly above the register cam 42 in the direction of the slot opening Ia. On the other hand, the register cams 42 protrude beyond the nip F. As a result, the laps 3 and 5 enter first into the guide hopper of the associated clamping means 31 or 32, then into engagement with the register cams 42 and finally into the respective nip gaps F.

FIG. 12 shows a clamping and register device of the third exemplary embodiment in a second variant. The register members 40-44 of the second variant correspond to the register members 40-44 of the first variant. Modified are only the clamping units, which are not formed in one piece in the second variant, but consist of several, firmly interconnected components. The clamping units of the second variant are in three parts and consist of two pairs of clamping means 31 and 32, which are formed in pairs in one piece and a rail-shaped connecting structure 37th

FIG. 13 shows one of the pairs of clamping means 31, 32. As in the first variant, the clamping means 31 and 32 of the pairs are connected to each other via a bent connection section 35. The shape of the clamping means 31 and 32 and the connecting portion 35 and the function correspond to the shape and function of the clamping means 31 and 32 of the first variant and the local connection portion 33, which is formed locally of the connecting structure 33 of the first variant. The clamping means pairs 31, 32 are fixedly connected to the connecting structure 37 of the respective clamping unit. In Figure 12, a locking connection is indicated. For the latching connection, a plurality of latching beads 36 are formed in the connection section 35, which are latched into recesses or bores of the respective connection structure 37. In FIG. 13, the connecting portion 35 is provided with a bore 38 penetrating both legs of the U-profile, so that the pair of clamping means 31 and 32 in the modification of FIG. 13 can be riveted or screwed to the connecting structure 37, for example. The connecting structure 37 is not formed in the second variant as a U-profile, but as an elongated, plate-shaped thin connecting rail. However, a U-profile again forms the connecting portion 35. Apart from the differences described, the clamping and register device of the second variant corresponds to the clamping and register device of the first variant.

Reference numerals:

1 forme cylinder

Ia canal opening

Ib canal bottom

Ic duct wall

Id channel wall

Ie canal wall

If canal wall ig shoulder

I shoulder

Ii extension

Ik drilling

2 printing form

3 turn

4 printing form

5 turn

6 recess

7 spring member

8 filler

9 mounting bolts

10 register recess

11 clamping means, clamping piece

12 clamping means, clamping piece

13 bearing section

14 fingers 15 footbridge

16 advantage

17 footbridge

18 deepening

19 -

20 -

21 clamping means, clamping piece

22 clamping means, clamping piece

23 bearing section

24 fingers

25-30 -

31 clamping means, clamping spring tongue

32 clamping means, clamping spring tongue

33 connection area, connection structure

34 engagement section

35 connection area

36 clicks

37 connection structure

38 bore

39 -

40 mounting section

41 engagement section

42 register cams

43 recess

44 bore

45 mounting bolts

D rotation axis

F nip

K tilt axis

R radial, vertical axis

V direction of rotation, circumferential direction

Claims

claims

1. A device for clamping a bendable pressure pad on a printing cylinder, the device comprising: a) a clamping channel (Ia-If) with a first clamping surface (Ic) for a leading Abbug (3) of the pressure pad (2) and one of the first clamping surface ( Ic) in the circumferential direction of the printing cylinder (1) at a distance from a second clamping surface (Id) for a trailing turn (5) of the same or a further pressure pad (4), b) a first clamping means (11, 21, 31), with the first clamping face (Ic) forming a nip (F) for the leading turn (3), c) a second clamping means (12; 22; 32) forming a nip (F) for the second clamping face (Id) d) wherein the clamping means (1 1, 12, 21, 22, 31, 32) in the clamping channel (Ia-If) are axially offset from one another and in the circumferential direction (V) in the region of the clamping gaps ( F) overlap.

2. Apparatus according to claim 1, characterized in that the clamping means (1 1, 12, 21, 22, 31, 32) overlap each other even if in none of the clamping gaps (F) a Abbug (3, 5) protrudes.

3. Device according to one of the preceding claims, characterized in that a channel wall (Ic, I d) of the clamping channel (Ia-Ie), with respect to the axis of rotation (D) of the printing cylinder (1) at least substantially radially to extends to an opening (Ia) of the clamping channel forming the first or the second clamping surface.

4. Device according to one of the preceding claims, characterized in that channel walls (Ic, Id) of the clamping channel (Ia-I f), which form the clamping surfaces, are spaced apart at least substantially parallel to one opening (Ia) of the clamping channel, wherein the distance or a maximum distance is preferably at most 5 mm.

5. Device according to one of the preceding claims, characterized in that the bevels (3, 5) each have a recess (6) into which in the clamped state that of the clamping means (1 1, 12, 21, 22, 31, 32) protrudes, which does not jam the respective turn (3, 5).

6. Device according to one of the preceding claims, characterized in that the clamping means (11, 12, 21, 22, 31, 32) of the nip (F) away from each tapering outwardly or protrude, so that an insertion funnel for the clamping action (3, 5) is obtained.

7. Device according to one of the preceding claims, characterized in that the clamping means (11, 12, 21, 22) by means of at least one spring member (7), preferably each by means of its own, only on the associated clamping means (11, 12; 22) acting spring member (7), are stretched in the direction of the respectively associated clamping surface.

8. Device according to one of the preceding claims, characterized in that the clamping means (11, 12, 21, 22) are mounted in a rigid body and in the clamping channel (Ia-If) as a whole movable.

9. Device according to one of the preceding claims, characterized in that in the clamping channel (Ia- If) offset axially to each other a plurality of first clamping means (1 1; 21) and a plurality of second clamping means (12; 22) are each arranged individually movable.

10. Device according to one of the preceding claims, characterized in that the first clamping means (1 1) abuts with an outer surface against a in the clamping channel (Ia-If) formed first bearing point, the first clamping means (1 1) against a spring force cantilevered away from the first clamping surface, and that the second clamping means (12) abuts with an outer surface against a formed in the clamping channel (Ia-If) second bearing, the second clamping piece (12) against a spring force from the second clamping surface tiltable stores.

1 1. Device according to the preceding claim, characterized in that the respective clamping means (1 1, 12) is pressed by the spring force against the associated bearing point.

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

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

14. Device according to one of the four preceding claims, characterized in that the clamping means (11, 12) each have only the degree of freedom of movement Kippbeweglichkeit to a tilting axis formed by the contact with the associated bearing point (K).

15. Device according to one of the five preceding claims, characterized in that the clamping means (11, 12) with the respective associated bearing point at least substantially only line contact.

16. Device according to one of the six preceding claims, characterized in that an edge formed on the respective clamping means or preferably in the clamping channel (Ia- If) forms the associated bearing point.

17. Device according to one of the seven preceding claims, characterized in that the spring force acts perpendicular or at an acute angle of at most 40 ° to the circumferential direction (V) of the impression cylinder (1) at the location of the opening (I a) of the clamping channel.

18. Device according to one of the eight preceding claims, characterized in that the clamping means (11, 12) each in its own or preferably together for the clamping means in the clamping channel (Ia-If) shaped recess (18), preferably at least over the majority of the length of the clamping channel extending groove, projecting and an edge region of the recess (18) or depressions, preferably an edge which forms the respective bearing point.

19. Device according to one of the preceding claims, characterized in that the clamping means (11, 12, 21, 22) each have a bearing portion (13, 23) for mounting the respective clamping means (11, 12, 21, 22) and one of Having the bearing portion (13; 23) outwardly in the direction of an opening (Ia) of the clamping channel (Ia-If) protruding fingers (14; 24), which forms the clamping gap (F) with the clamping surface (Ic, Id).

20. Device according to the preceding claim, characterized in that spring members (7) are supported in the clamping channel and in the region of the bearing portion (13, 23) act on the respective clamping means (11, 12, 21, 22), preferably in the Bearing portion (13, 23) protrude.

21. Device according to one of claims 1 to 9, characterized in that the clamping means (21, 22) in the clamping channel (Ia-If) are linearly guided along a translation axis perpendicular or with an inclination of at most 40 ° to the circumferential direction (V) of the pressure cylinder (1) at the location of the opening (Ia) of the clamping channel points.

22. Device according to one of claims 1 to 6, characterized in that the clamping means (31, 32) are each form elastic or material elastic, preferably clamping spring tongues.

23. Device according to the preceding claim, characterized in that the clamping means (31, 32) in a connecting region (33), from which they rise with axial offset, are fixedly connected to each other, wherein the clamping means (31, 32) preferably in one Pieces are shaped.

24. Device according to the preceding claim, characterized in that the connecting region (33) about a longitudinal axis of the clamping channel (Ia-If) is curved.

25. Device according to the preceding claim, characterized in that in the clamping channel (Ia- If) axially offset from each other several pairs with each per pair of a first clamping means (31) and a respective second clamping means (32) and each forming a pair Clamping means (31, 32) fixedly connected to each other, preferably formed in one piece.

26. Device according to one of the four preceding claims, characterized in that the clamping means (31, 32) are formed in one piece clamping spring tongues and one of the clamping means (31, 32), preferably the first clamping means (31) on a trailing side of the Clamping channel (Ia-If) and the other clamping means (32), preferably the second clamping means (32), on a leading side of the clamping channel (Ia-If) in the direction of a channel opening (Ia) and the respective clamping means (31, 32 ) formed nip (F) protrudes.

27. Device according to one of the five preceding claims, characterized in that in the clamping channel (Ia- If) a rail or rod-shaped axially elongate connection structure (33; 37) arranged and connected to the clamping means (31, 32) or in one piece is formed and that in the clamping channel (Ia-If) another first clamping means (31) for the leading Abbug (3) and a further second clamping tel (32) for the trailing turn (5) are arranged and connected to the connecting structure (33; 37) or formed in one piece.

28. Device according to the preceding claim, characterized in that the clamping means (31, 32) with the connecting structure (33, 37) are positively connected, preferably clipped, screwed or riveted, or are formed in one piece.

29. Device according to one of the preceding claims, characterized in that the clamping means (1 1, 12; 21, 22; 31, 32) are individually movable and each form only a single clamping gap (F) whose axial width is preferably at most 10% the width of the pressure pad to be clamped (2, 4) is.