DE102013224489A1 - Sheet-processing machine for use in e.g. sheet-fed offset printing press, has guide segments that are fixed with sheet printing pressing arcs, such that lateral edges of sheets are pressed and fixed to guide segments - Google Patents

Abstract

The machine has a sheet transport drum (4) that comprises multiple movable guide segments (5) which are arranged axially with respect to a rotational axis. The guide segments comprise multiple sheet printing pressing arcs (7) that are fixed on the concentric arc bearing surfaces toward the rotational axis. The sheet printing pressing arcs are fixed with the guide segments, such that the lateral edges of the sheets are pressed and fixed to the guide segments. An independent claim is included for a method for transporting sheets through a sheet-processing machine.

Description

The invention relates to a sheet-processing machine with a sheet transport drum for transferring sheets around a revolving axis according to the preamble of the first claim and a method for transporting sheets through a sheet-processing machine with a sheet transport drum.

Especially in sheet-fed presses, the sheets must be transferred from one printing cylinder to the next. Furthermore, the sheets must be transferred from the last printing cylinder to a delivery.

For this purpose, located between the printing cylinders at least one transfer drum with gripper systems, which grips the leading edge of the sheet and feeds the next impression cylinder. After the last impression cylinder, gripper carriages running around a sprocket take the leading edge and feed it to the delivery stack. Both the printing cylinders and after the last printing cylinder so the further transport of the sheet takes place in that the sheets are taken at the front edge and guided substantially on a circular path.

In the delivery of the sheet in one-sided printing (Perfecting) on sheet guiding, in particular sheet guide plates, passed, which are usually applied with vacuum and suck the bow. When printing on both sides (perfecting), the sheet is usually held in suspension without contact by means of a levitation sheet guide and thus only touched on its leading edge. However, this type of leadership is very prone to failure and often succeeds only limited, since the bow tends to flutter at high speeds and is also disturbed by suction devices, dryers, powder pressure, etc.

From the DE-PS 514 098 a sheet delivery apparatus is known in which a Ausführtrommel the printed sheets from a printing cylinder decreases. The Ausführtrommel is formed by two annular discs, which are adjustable according to the width of the sheet. The acquisition of the sheet leading edge of the printing cylinder by means of a gripper or suction bar, which connects the two annular discs together. Thus, the two annular discs spanning sheet is also held on the circumference, the arc, for example, from a tape, is pressed onto the annular discs. A disadvantage of this solution is that the bands must remain aligned exactly to the annular discs and the holding force of the bands is difficult to adjust and control.

From the JP 55022953 A is a sheet transport drum with two on the unprinted sheet side edges adjustable arch supports known to move the fixed at the front edge sheet. The disadvantage of this solution is that the bow can hang after the transfer center to the previous cylinder between the arch supports and slip from the arch supports.

From the DE 100 14 417 A1 a device for transporting a sheet for a rotary printing machine is known in which in addition to the arch supports a last free edge of the sheet, namely the sheet trailing edge, acquiring suction gripper is provided. The gripper for the sheet trailing edge must be designed here as a suction pad to fix the lying on a closed lateral surface sheet trailing edge can. A disadvantage of this solution is that the sheets are not held on the arch supports after the transfer center to the previous cylinder.

From the DE 101 02 080 A1 a device for turning flat specimens in half-turn sheet-processing machines is known, which may have conical support elements. About a catcher device, the side edges of the rigid cardboard are pressed against the inclined surfaces of the conical support elements, so that the more rigid material can be converted into a curvature of the peripheral surface of the transfer drum corresponding curvature. The disadvantage of this solution is that the bow is only curved but not fixed. Too much employed catcher element, the sheet is undesirably deformed on the conical support elements.

From the DE 10 2004 031 171 A1 is known a machine for processing sheets, wherein the delivery drum is formed with vacuum-loaded discs. The discs are adjustable on the bow side edges. Preferably, only the angular area of the panes coming into contact with the sheet is subjected to suction air. Already from the DE-PS 517 004 It is known to provide a Bogenausführvorrichtung with displaceable according to the width of the sheet, adjustable on the pressure-free side edges suction discs. Again, only the suction openings required for sucking the sheet side edges are subjected to suction. A disadvantage of suction discs is that the suction discs must be relatively wide in order to produce a sufficient holding force, resulting in pressure-free areas of the order of 10 mm. Another disadvantage is the complex setting of the sucking angle range of suction discs.

From the DE 10 2006 019 029 A1 is known a sheetfed processing machine, in which all transfer cylinder suction bars for Fixing the sheet leading edges and cylindrical discs having circumferentially arranged means for detecting each have a side edge of the sheet material. The means may be vacuum-pressurized openings or protruding support members. A disadvantage of this solution is that suction pads do not hold the sheet leading edges securely enough and the suction discs cause a wide support surface or the sheet is damaged by the protruding support elements.

From the DE 10 2005 002 509 A1 a machine for processing sheets of printing material is known in which the arc side edges on the adjustable sheet supports guide rollers are assigned. The guide rollers may be assigned to the arch supports for bow cross-tightening diverging. The guide rollers are pressed against the arch supports, so that the sheet is clamped between the arch supports and the guide rollers and can not flutter. A disadvantage of this solution, the complex positioning of the guide rollers to the arch supports and wear by the divergent arrangement.

From the DE 10 2008 025 392 A1 a sheet guiding device for a Transferterzylinder is known in which a right and a left sheet support bracket for the sheet side edges each cooperating with a stationary mounted guide roller means for guiding the sheet. The disadvantage of this solution is that the guide rollers must be set and adjusted separately. Particularly disadvantageous must be maintained by a condition imposed by the roll geometry distance to the transfer center of the upstream cylinder, which can already cause a change in position of the sheet on the sheet support brackets.

The invention is therefore based on the object to provide an alternative possibility for a sheet transport in a sheet-processing machine.

According to the invention the object is achieved by a device having the features of the independent device claim and a method having the features of the independent method claim. Advantageous embodiments will become apparent from the dependent claims, the description and the drawings.

The invention has the advantage that an alternative possibility for sheet transport in a sheet-processing machine is provided.

According to one embodiment of the invention, it is provided that the side edges of the sheets are pressed by pressing elements circulating with the guide segments on the axially adjustable guide segments. By the pressing elements, it is particularly advantageous possible to guide the sheet in the region of its side edges so that the required pressure-free area is as small as possible. Furthermore, pliable material is securely held by the sheet transport drum and transported by a press nip between the pressing elements and the guide segments. Thus, each material to be processed is kept exactly on the ideal orbit, even at higher centrifugal forces, which allows higher machine speeds.

In cost-effective design, the guide segments are formed as the pressure bearing bearing guide plates. In a preferred embodiment of the invention, it is provided to assign the guide plates designed as a gripper pressure elements, which are moved by a suitable drive against the guide plates. As drive, an actuator or preferably a transmission is used. By the gripper forces generated by the grippers, a secure hold of the sheet side edges can be ensured on the guide disks. According to the invention, only a very narrow unprinted side edge is made possible. Advantageously, a fast gripping of the sheet side edges is achieved, so that the sheet is fixed immediately after the transfer center from the previous sheet conveying system on the guide disks.

It is proposed as a drive for the movement of the pressing elements, a pneumatic or fluid drive of gears and, alternatively, an electric drive of the transmission. Furthermore, an electro- or permanent magnetic drive is proposed. The electromagnetic drive (lifting magnet) can rotate with the gearbox. Another suggestion is the possibility to rotate an anchor to the gearbox and to switch the gearbox by a non-rotating electric or permanent magnet, this principle of action can also be reversed, so that the magnet rotates and the anchor is stationary. Particularly preferred are the pressing elements, in particular grippers, but driven by a cam control. Another solution consists in a sliding block with cam roller, which is driven (driven by a curve) and thereby actuates a gripper.

In addition to the guiding segments with pressing elements, further guiding segments, which have no pressing elements, are conceivable which guide the arc in the area of further pressure-free corridors, that is to say within the sheet format.

Developing it is provided to form the guide segments with a suitable sheet contact surface, which protects both the bearing surface of the sheet, compensates for gripper tolerances and provides a secure fit. The guide segments can for this purpose via elastic elements (rubber profiles, Plastic parts, etc.). Preferably, the sheet contact surface of the guide disks is formed elastically. Particularly preferably, a plastic or rubber hose is arranged along the surface of the guide disks, which simultaneously ensures a narrow pressure-free side edge. The guide disks can be arranged such that they press the sheet in the transfer center to the lateral surface of a cylinder, for example a printing cylinder, or they can also stand with a certain distance to the lateral surface.

Further, the trained as a gripper pressure elements are designed with appropriate design and / or material selection to securely fix the sheet side edges on the guide plates. The grippers can be designed in accordance with the leading edge clamping grippers of sheet guiding cylinders in Bogenoffsetrotationsdruckmaschinen.

In further developments, it is provided to use a sensor system for detecting the sheet position on the sheet transport drum. After evaluation of the sheet position, a further control of actuators of the gripper for sheet position improvement on the guide disks, in particular for bow transverse tightening done.

The sheet transport drum can be used singly or multiply in each sheet processing machine. Preferably, however, the sheet transport drum is used in printing presses, where it can be arranged between two printing units for sheet transport and / or in a delivery as a delivery drum. The sheet transport drum can also be used in conjunction with a turning device application. It is also possible for a plurality of sheet transport drums according to the invention to be arranged one behind the other.

In the following, the invention will be explained by way of example. The accompanying drawings show schematically:

1 : Sheet transport drum between two printing cylinders of a sheet-fed printing machine;

2 : Sheet transport drum as an output drum after a last printing cylinder of a sheet-fed printing press;

3 : Perspective view of a development of a guide disc with a cam-controlled gripper finger and a hose as an arc contact element;

4 : Simple embodiment of a cam-controlled drive mechanism for a gripper of a gripper system;

5 : Alternative embodiment of a drive mechanism via a four-bar linkage for a gripper of a gripper system.

The 1 shows in an embodiment of the invention, two printing units of a sheet-fed press, such as a sheetfed offset press. Each printing unit here contains a double-sized printing cylinder, for example 1 arranged in gripper channels not shown gripper systems for transporting the sheet to be printed. For sheet transport, the sheets are clamped by the gripper systems at the leading edge and during the rotation of the printing cylinder 1 transported through the printing unit. Every impression cylinder 1 acts with a simple-sized rubber cylinder 2 and this with a single-sized plate cylinder 3 together in the respective printing unit. Alternatively, of course, other cylinder sizes and a different number of cylinders can be used. The printing machine is preferably designed in a row construction and includes other printing, lacquer and / or finishing plants, not shown.

In each printing unit is the plate cylinder 3 an unillustrated inking or Farbund dampening assigned. The plate cylinder 3 is covered with a printing plate, also not shown, which is colored by the inking unit with the appropriate ink. When unrolling the plate cylinder 3 on the rubber cylinder 2 the ink is printed on the blanket covered with a rubber blanket 2 transfer. Between the rubber cylinder 2 and the impression cylinder 1 a printing zone is formed, through which the printing material to be printed, for example a sheet, from the printing cylinder 1 is encouraged. In the print zone, the ink from the blanket cylinder 2 again motivated to transfer to the bow.

Between the two printing units, the sheets are guided and transferred by one or more sheet guiding drums. At least one of the sheet guiding drums in the machine is as a sheet transport drum according to the invention 4 educated. Shown here is a double-sized sheet transport drum 4 between the printing units, the leading edge clamping gripper has to transport the sheet. The sheet transport drum 4 takes over the sheets at the front edge in a transfer center from the previous printing cylinder 1 and then passes the sheets to the downstream cylinder.

The sheet transport drum 4 contains in addition to the leading edge grippers two guide discs 5 or disc segments that are axially on a shaft 6 are slidably disposed and with the shaft 6 circulate. The guide disks 5 are positioned opposite the side edges of the printing material such that the printing material on the guide pulleys 5 is wound up. The winding takes place in such a way that the usually pressure-free side edges on the guide disks 5 rest. The guide disks 5 point one to the shaft 6 concentric bearing surface for the bow. Every disc 5 Andrückelemente are assigned such that these with the guide disc 5 revolve and partially against the bow bearing surface of the guide disc 5 apply a pressing force. The pressing elements are here as gripper systems 7 educated. For a double-sized sheet transport drum 4 should every guide plate 5 have at least four pressing elements. The gripper systems 7 are each on the outside of the guide plates 5 arranged and with the guide disks 5 format adjustable. Due to the concentric sheet support surfaces of the guide disks 5 and the pressing elements is formed a press nip for the sheet. The sheets are fixed in the press nip by two parallel clamping surfaces.

The 2 shows in a further embodiment of the invention, a display of a sheet-processing machine, here a sheet-fed press, with a sheet transport drum according to the invention 4 , The delivery includes a not further described chain conveyor system with circumferentially guided gripper carriage for taking over and conveying the printed sheet to a likewise not further designated delivery pile. Trained as a delivery drum sheet transport drum 4 contains axially to a shaft 6 adjustable guide discs 5 , which carry the pressing elements. The delivery drum has recesses for the gripper carriage of the chain conveyor system guided around the delivery drum. The gripper carriage take over the sheets to be deposited in a transfer center from the last printing cylinder 1 the machine and fold the bows around the delivery drum. After the transfer around the delivery drum, the sheets are guided by the gripper carriage along the chain circle to the delivery pile and deposited there.

Trained as a delivery drum sheet transport drum 4 contains here also as gripper systems 7 trained pressing elements which the guide plates 5 are assigned permanently movable. For the sheet transport and the exact deflection of the arch around a sprocket main shaft, the sheet side edges after being taken over by a gripper carriage of the gripper systems 7 against the sheet support surfaces of the guide disks 5 pressed. The guide disks 5 point to the wave for this 6 concentric sheet support surfaces. The sheet can thus exactly concentric around the axis of rotation of the sheet transport drum 4 be guided.

The 3 shows a perspective view of a development of a guide plate 5 the sheet transport drum 4 with a cam-controlled gripper system 7 and a hose associated with the sheet contacting surface 8th , The gripper system 7 has a gripper finger 9 on, in a closed state, the sheet side edge against the hose 8th pushes and lies in the illustrated open state below the sheet support surface. In the closed state, not shown, of the gripper finger 9 becomes the bow of the clamping surface of the gripper finger 9 and the slightly flattened hose 8th held, which form the press nip. The clamping surface of the gripper finger 9 and the contact surface of the hose 8th secure a backlash-free fixation.

The gripper finger 9 Here is one of the fixed on the Leitscheibe 5 arranged storage 10 recorded and runs with the rotating guide disc 5 around. The gripper finger 9 stands further with a radial to the guide plate 5 movable transmission coupling 11 in connection. The transmission link 11 is rotatable with one over a pivot point 13 rotatable on the guide plate 5 mounted drive rocker 12 connected. The drive swing 12 carries a rotatable cam roller 14 that with a fixed cam 15 is in active connection. From a spring 16 becomes the cam roller 14 on the cam 15 held. When relocating the cam roller 14 radially outward via the transmission coupling 11 a shift of the gripper finger 9 in the open position shown here to release the sheet. At opposite from the spring 16 supported movement of the transmission link 11 the gripper finger closes 9 for fixing the bow.

The 4 shows a simple embodiment of a cam-controlled drive mechanism for a gripper of a gripper system 7 , When force, for example, from a curve, according to the direction of the arrow is the bow edge 17 against one on the diffuser 5 arranged hose 8th pushing grippers raised and the bow edge 17 released with it.

The 5 shows an alternative embodiment of a drive mechanism via a gear for a gripper of a gripper system 7 , In particular, a transmission based on a four-membered transmission is proposed. This solution is exemplary of a variety of arrangements based on four-bar linkages. An advantage of this embodiment is that the gripper track only slightly above the guide disc 5 runs, which allows a closing of the gripper shortly after passing the transfer center, ie at a point where a lateral surface of the transferring cylinder would still collide with a higher gripper path. Further alternatively, not shown six-membered gears could be used to drive the gripper, which advantageously require a relatively small drive angle. Proposed Furthermore, the drive cranks of the illustrated four- and six-membered gear train as a pinion and drive via racks.

For effect: To fix the bow on the guide plates 5 will be a number of with the guide discs 5 circumferential grippers provided on the outside of the guide plates 5 are attached. To avoid a collision with the impression cylinder 1 need the grippers in the area of the impression cylinder 1 be swung, usually to below the effective surfaces, so the sheet support surfaces, the guide plates 5 ,

After passing the transfer center between the pressure cylinder upstream with respect to the sheet transport direction 1 and the sheet transport drum 4 When the sheet is transferred, the grippers close and thus fix the sheet on the guide disks 5 , To release the arc for transfer to the downstream cylinder or after passing the sprocket main shaft area in the delivery, the grippers are opened.

The exemplary drive solution consists of grippers that are driven by cams 15 to be controlled. These cams 15 sit on the wave 6 , do not run with this, but are together with the Leitscheiben 5 and the grippers thereon axially displaceable.

LIST OF REFERENCE NUMBERS

1

 pressure cylinder

2

 rubber cylinder

3

 plate cylinder

4

 Sheet transport drum

5

 idler pulleys

6

 wave

7

 gripper system

8th

 tube

9

 gripper fingers

10

 storage

11

 transmission coupling

12

 driving rocker

13

 pivot point

14

 follower

15

 cam

16

 feather

17

 margin of sheet

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 514098 [0005]
• JP 55022953 A [0006]
• DE 10014417 A1 [0007]
• DE 10102080 A1 [0008]
• DE 102004031171 A1 [0009]
• DE 517004 [0009]
• DE 102006019029 A1 [0010]
• DE 102005002509 A1 [0011]
• DE 102008025392 A1 [0012]

Claims (10)

Sheet processing machine with a sheet transport drum ( 4 ) for transferring sheets around a revolving axis, the sheet transporting drum ( 4 ) axially displaceable to the axis of rotation guide segments, wherein the guide segments to the axis of rotation concentric sheet support surfaces and wherein the sheets of pressing elements on the guide segments are fixed, characterized in that the pressing elements are associated with the guide segments movable and that with the pressing elements a press nip for bow the guide segments is bildbar. Apparatus according to claim 1, characterized in that the guide segments as the pressing elements bearing guide discs ( 5 ) are formed. Apparatus according to claim 1 or 2, characterized in that the guide segments elastic sheet contact elements, in particular hoses ( 8th ), exhibit. Apparatus according to claim 1, 2 or 3, characterized in that the pressure elements are designed as grippable against the guide segments gripper. Apparatus according to claim 4, characterized in that the grippers cooperate with a four- or six-bar linkage. Device according to at least one of the preceding claims, characterized in that the pressing elements are cam-controlled movable. Device according to at least one of the preceding claims, characterized in that non-rotating cams ( 15 ) are provided, which are designed to be displaceable with the guide segments. Device according to at least one of the preceding claims, characterized in that the sheet transport drum ( 4 ) is arranged as a delivery drum in a display of a sheet-fed press. Device according to at least one of the preceding claims, characterized in that the sheet transport drum ( 4 ) between pressure cylinders ( 1 ) is arranged a sheet-fed press and has leading edge clamping gripper. Method for transporting sheets through a sheet-processing machine with a sheet transport drum ( 4 ), wherein the sheet transport drum ( 4 ) The sheet on guide segments fixed to a revolving axis leads, characterized in that the sheets for the transport of arranged on the guide segments, together with the guide segments rotating pressing elements are pressed onto the guide segments.

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