WO1997039896A1

WO1997039896A1 - Turning arrangement for a printing machine, especially a sheet-feed offset printing machine

Info

Publication number: WO1997039896A1
Application number: PCT/EP1997/001424
Authority: WO
Inventors: Günter Stephan
Original assignee: Heidelberger Druckmaschinen Aktiengesellschaft
Priority date: 1996-04-20
Filing date: 1997-03-21
Publication date: 1997-10-30
Also published as: CZ320998A3; DE59701011D1; EP0900143A1; CZ292390B6; DE19615730A1; JP2000508594A; EP0900143B1; CN1216501A

Abstract

A turning arrangement (1) for a printing machine comprises a transfer drum (2) fitted between a first (4) and a second counter-pressure cylinder (6), beneath which there is a register cylinder (16) with a plurality of suction apertures (20) holding the sheets (10) which, after the grippers (8a, 8b) have opened, conveys the sheets (10) in register into an intermediate storage system (19) in which the sheets (10) are temporarily stored in substantially tensioned form on a first sheet guide (24) fitted with blower nozzles (22). A jawed turning grip device (30) fitted on the transfer drum (2) grips the rear edge of the sheet (10) laid in the intermediate storage system (19) and transfers it to a prior art gripping device (34) formed on the subsequent counter-pressure cylinder (6) which takes the sheet (10) turned in this way to a downstream pressure slot to print the reverse side of the sheet.

Description

Turning device for a printing press, in particular a sheet-fed offset printing press

description

The invention relates to a turning device for a printing press, in particular a sheet-fed offset printing press, according to the preamble of claim 1.

For double-sided printing of sheet-like material in a sheet-fed offset printing machine in perfecting, it is necessary to turn the sheet after printing on the top of the sheet by means of a turning device in order to then print on the sheet on the back of the sheet.

From DE-PS 30 50 295 a turning device is known in which the sheet is passed with its leading edge ahead from a transfer drum to a storage drum which has suction devices in the area of the sheet trailing edge which suck and tension the sheet at its trailing edge before it is gripped with its trailing edge ahead of the pincer gripper device of a downstream turning drum and transported further.

From DE-OS 41 40 762 it is also known to store the sheet on the impression cylinder and to grasp and turn it by means of a reversing gripper system arranged on the transfer cylinder at the rear edge. This, also referred to as "single drum" turning system has the disadvantage that the sheet can not be held or sucked in from the impression cylinder, especially in the area of its rear edge, so that it has to be held on the impression cylinder by complex blowing systems. Furthermore, in addition to the reversible grippers, further suction systems are required which first have to lift the sheet off the impression cylinder before the trailing edge of the sheet can be grasped. The turning system described leads in particular at high printing speeds in succession 1

the complex movement of the gripper and suction systems as well as strong mass forces caused by the movement of the bow; to inaccuracies in the turning of the sheet and thus to a reduced register accuracy.

From DE-PS 37 17 093 a turning device is known in which the sheet is transferred from an upstream impression cylinder with its leading edge ahead to the first gripper device of a transfer drum, the trailing edge of the sheet is sucked against the peripheral surface of the transfer drum by a suction device and the sheet trailing edge is gripped by a plier turning gripper system before the first gripper device releases the leading edge of the sheet. The leading edge of the sheet is then fed to a suction belt which is curved and guides the sheet. Subsequently, the sheet is transferred from the pliers reversing gripper device with its rear edge to a downstream impression cylinder.

The object of the invention is to provide a turning device with which the sheet can be turned safely, reliably and without greasing, as well as with a high degree of precision and register accuracy, and which has a high speed both in straight printing operation and in perfecting operation Printing press allowed.

This object is achieved according to the invention by the features of claim 1.

Further features of the invention are contained in the subclaims.

The device according to the invention has the particular advantage that it is possible to turn the sheet with only one transfer drum without the sheet on the

Having to store printing cylinders and without requiring the use of discontinuously moving systems. The device according to the invention also has the advantage that the accelerations acting on the sheet and the associated mass forces during the turn are comparatively small, which results in a low material stress and the risk of damage to the sheet material is reduced. The invention is described below with reference to the drawings based on preferred embodiments. Show in the drawings

Fig. 1 shows a turning device according to the invention with a below one

Transfer cylinder located register cylinder and a subordinate intermediate storage system at the time of the sheet transfer from the transfer drum to the register cylinder,

Fig. 2 shows the device according to the invention of Fig. 1 in a state in which the

When gripping the trailing edge of the sheet, a register gripper device of the transfer drum guides the sheet from the register cylinder into the intermediate storage system,

3 shows a schematic representation of a further embodiment of a turning device according to the invention, with a register cylinder arranged between an upstream impression cylinder and a downstream impression cylinder and an intermediate storage system arranged above the registration cylinder,

Fig. 4 is a schematic cross-sectional view of a register cylinder with a

Gripper device,

Fig. 5 is a schematic longitudinal section through the register cylinder of Fig. 4 and

6 shows a schematic spatial representation of a further embodiment of a register cylinder, in which the suction openings are connected to a vacuum source via a rotary valve arranged on the end face of the cylinder, k

7 shows an enlarged detailed view of a preferred embodiment of a temporary storage system according to the invention,

FIG. 8 shows a schematic top view of the temporary storage system from FIG. 7.

1 comprises a transfer drum 2, which is arranged between a first impression cylinder 4 of an upstream printing unit and a second impression cylinder 6 of a downstream printing unit. The transfer drum 2 and preferably also the impression cylinders 4, 6 have a double-large diameter with respect to the associated blanket cylinder and / or printing plate cylinder, but in another embodiment of the invention (not shown), they can be used in the same way as single or multiple sizes, e.g. triple or quadruple sized cylinders. So it is conceivable that the transfer drum 2 has a diameter three times larger, whereas the impression cylinders 4, 6 are only twice large.

A first and a second gripper device 8a, 8b are provided opposite one another on the ÜTjer guide drum 2, which take over a sheet 10 to be printed in the area of the gripper center 12 represented by a dashed line from the upstream impression cylinder 4 at the leading edge of the sheet. The leading edge of the sheet 10 is fed to a register cylinder 16 according to the invention arranged below the transfer drum 2, in the circumferential surface 18 of which a plurality of suction openings 20 which can be acted upon by suction air are arranged and which suck the sheet onto the circumferential surface 18 of the register cylinder 16 and keep on this. In the embodiment of the invention shown in FIGS. 1 and 2, the register cylinder 16 rotates at the same peripheral speed as the transfer drum 2 in the direction of arrow A, so that the sheet 10 is taken over by the register cylinder 16 and 5 is transported further. The suction of the sheet onto the circumferential surface 18 of the register cylinder 16 also advantageously leads to smoothing and Tightening of the sheet 10 on the cylinder surface 18, which additionally improves the guided guidance through the register cylinder 16.

The register cylinder 16 can furthermore have a gripper device 14 shown in FIG. 1, which takes over the leading edge of the sheet 10 in a known manner from the gripper device 8a or 8b of the transfer drum 2 in a known manner, which further improves the register accuracy when the sheet 10 is transferred can be achieved by the transfer drum 2 to the register cylinder 16.

In the preferred embodiment of the invention, the register cylinder 16 transfers the sheet leading edge to an intermediate storage system 19 after the cylinder has been rotated through an angle of, for example, 5-60 °.

The intermediate storage system 19 has a first sheet guiding device 24 equipped with blowing nozzles 22, on which the sheet is guided in an essentially elongated form. In the preferred embodiment, the sheet guiding device 24 has comb-like projections 26 which are arranged in parallel next to one another and which engage in corresponding grooves or recesses 28 formed in the register cylinder 16. This ensures a safe removal of the sheet 10 from the circumferential surface 18 of the register cylinder 16 without causing damage to the leading edge of the sheet when the sheet is transferred from the register cylinder 16 to the intermediate storage system 19. Due to the blowing air emerging from the blowing nozzles 22, preferably essentially tangential to the arc, the arc 10 is in a well-defined floating state above the

Sheet guiding device 24 is held while it is being transported by the register cylinder 16 into the intermediate storage system 19 at substantially constant speed. After the sheet has been deposited essentially in its entire length in an elongated form on the sheet guide device 24 of the intermediate storage system 19, the trailing edge of the sheet 10 becomes known from the prior art

Reversible gripper device 30, preferably a pliers reversible gripper device, as shown in Fig. 2, gripped and progressing the trailing edge of the sheet, as by the Dashed line indicated in Fig. 2, lifted from the peripheral surface 18 of the register cylinder or from the sheet guide 24. The pliers reversible gripper device 30, which, as indicated by the double arrows B, is adjustable, transfers the rear edge of the turned sheet 10 to a known gripper device 34 of the downstream impression cylinder 6, which uses the turned sheet for printing on the back of the sheet to the printing gap (not shown) of the downstream printing unit feeds.

In the preferred embodiment of the invention, a second sheet guiding device 38 is further provided below the second impression cylinder 6, as is shown, for example, in FIGS. 1 and 2. The second sheet guiding device 38 is preferably also equipped with blowing nozzles 36 which, by means of a tangential blowing direction to the sheet guiding plane, produce both a blowing and a suction effect according to the so-called "hydrodynamic paradox" and through which the sheet 10 is sucked in so far that it is drawn from the first Sheet guide device 24 is lifted off and brought into a stable floating position above the second sheet guide device 38, in which the sheet 10 does not touch the second sheet guide device 38. While the trailing edge of the sheet 10 is lifted off by the pincer reversing gripper device 30 and the leading edge of the sheet 10 reaches the area of influence of the second sheet guiding device 38, an automatic lifting of the sheet from the first sheet guiding device 24 and a transfer of the sheet takes place in the area of the sheet leading edge 10 in a stable, non-contact floating position above the second sheet guide device 38. As a result, the flipped sheet 10 is evenly raised from its front to its rear edge and brought into a plane from which it can then pass through to the downstream impression cylinder 6 without the action of centrifugal forces Pliers reversible gripper device 30 is withdrawn. As shown in FIGS. 7 and 8, in the preferred embodiment of an intermediate storage system 19 according to the invention, the first sheet guiding device 24 consists of a first subsystem 24a and a second subsystem 24b. The first subsystem 24a consists of blowing nozzles 22a; in Fig. 8 floating strips 23, which at the same time the comb-like in the front area Form projections 26 which engage in the associated grooves or recesses 28 of the register cylinder 16.

The second subsystem 24b preferably also consists of strips 25 which engage in the interspaces between the floating strips 23 of the first subsystem 24a in a comb-like or finger-like manner. The second subsystem 24b can be equipped with blowing nozzles 22b in the same way as the first subsystem 24a, as is indicated, for example, in FIG. 8 by some blowing nozzles 22b shown as examples. The second subsystem 24b is preferably rounded at its rear end section in such a way that a transition to the second sheet guiding device 38 is created in such a way that the rounding affects a plane d parallel to the surface of the second guiding device 38, as is shown, for example, in FIG 7 is shown.

In the preferred embodiment of the invention, the second subsystem 24b is preferably motor-displaceable relative to the first subsystem 24a of the sheet guiding device 24, so that sheets 10 of different format lengths always lie with their leading edge at the reference point E of the rounding at the end section of the second subsystem 24b, while the trailing edge of the sheet is gripped by the gripper reversible gripper system 30. In the preferred embodiment of the invention, the sheet guiding device 38 is arranged such that it can be pivoted for the format setting on the one hand about the downstream impression cylinder 6 without substantially changing the tangential transition of its guiding plane to the impression cylinder 6, and on the other hand with such

Swiveling movement parallel to the sheet guiding plane of the second sheet guiding device 38 essentially always affects the outlet curvature of the end section of the second subsystem 24b at the reference point E and at the distance d.

In this way, all sheet formats are raised and turned regardless of their length with identical functions at the front and rear edges. In the preferred embodiment of the invention, an adjustment gear 27, for example shown in FIG. 7, can be provided, which at the same time carries out a displacement of the subsystems 24a and 24b and at the same time adjusts the second sheet guide device 38 in such a way that it always depends on the format length is arranged in such a way that the previously described distance d between the curvature of the end section of the second subsystem 24b and the surface or guide surface of the second sheet guide device 38 is maintained.

The second sheet guiding device 38 can preferably be formed by a first subsystem 38a arranged in the vicinity of the downstream counter-pressure cylinder 6 and a second subsystem 38b which is movably arranged with respect to this first subsystem 38a. In the preferred embodiment of the invention, the first and the second subsystem 38a, 38b of the second sheet guiding device 38 are designed in such a way that the first subsystem 38a, based on the position for the smallest format length to be selected, is then also preferred, preferably by means of the adjusting mechanism 27, is pivotable when the second subsystem 38b and the subsystems 24a and 24b of the first sheet guiding device 24 have already assumed their end position. For this purpose, it can be provided that rollers 40 are provided on both sides of the first subsystem 38a, which are guided in a corresponding cam track 41 arranged below the downstream counter-pressure cylinder 6, as is shown schematically in FIG. 7. Furthermore, it can be provided that the first section 38a of the second sheet guiding device 38 is rounded off in the area below the downstream impression cylinder 6, as shown, for example, in FIG. 7.

During the straight printing operation of the printing press, in which there is no sheet turning, the first sheet guiding device 24 and the subsystem 38b are moved together by the adjusting mechanism 27 to the shortest format length and the first subsystem 38a is further extended by means of the cam rollers 40 and the cam track 41, which are shown in FIG 7 Moving the fine print position shown by broken lines. In this position, the blowing / suction nozzles 36 of the second sheet guide device 38 are directed against the peripheral surface of the transfer drum 2, as a result of which the sheet 10 in particular in the region of its Bow end is stable and flutter-free. Such a bluff-assisted guidance of the sheet 10, in which the blowing air quantities of the blowing air nozzles 36 are preferably adjustable, the sheet 10 is guided flutter-free even at high printing machine speeds in straight printing operation, and damage to the sheet end is avoided. The first sheet guide device 24 and the tongs reversing gripper device 30 of the register cylinder 16 are deactivated in the preferred embodiment of the invention during the straight printing operation. Furthermore, it may be advantageous to apply blown air or negative pressure to the recess 218 and / or the recess 224 and / or the recess 226 during the straight printing operation in order to achieve better sheet guiding in the region of the register cylinder.

In a further embodiment of the invention (not shown), the sheet guiding devices 24, 38 can be formed in the same way by rollers arranged over the surface, on which the sheet is moved along.

Furthermore, it is conceivable to design the first sheet guiding device 24 as suction belts rotating at the peripheral speed of the register cylinder 16, on which the sheet is sucked in and carried along in register. The suction belts can either be designed as continuous suction belts, or similar to the subsystems 24a and 24b behind the register cylinder 16, or they can consist of a plurality of suction belts running parallel to one another and guided around the register cylinder 16, which are guided in corresponding grooves in the register cylinder 16 are. Furthermore, it can be provided in the area of the first sheet guiding device to provide a chain gripper system, not shown in the figures, which continues the sheet leading edge after taking over from the register cylinder 16 or the transfer drum 2 in register.

The intermediate storage system 1 is not limited to use in a turning device with a register cylinder according to the invention, but can accordingly also be used in the known turning devices according to the prior art. In a further embodiment of the invention shown in Fig. 3, in which the parts corresponding to the parts of the previously described embodiment are provided with a reference number increased by 100, the register cylinder 116 is directly between the first impression cylinder 104 and the second impression cylinder 106 arranged. In this embodiment of the invention, the transfer drum 2 of the previously described embodiment of the invention is therefore omitted. In this embodiment of the invention, the register cylinder 116 is preferably designed as a double-sized cylinder. However, it can also have a different size and be designed, for example, as a triple, quadruple or five-fold cylinder.

o The embodiment of the invention is described below using a double-sized register cylinder 116. The double-sized register cylinder 116 has two known, opposing gripper devices 114a and 114b which take over the sheet 110 from the upstream impression cylinder 104 in a known manner and hold it up to the gripper centers 132 at the front edge and guide them in register. After 5 passes through the gripper center 132, the sheet 110 reaches the

Circumferential surface sections α, β and γ and is then continued in register by the action of the suction and frictional forces. The respective gripper device 1 14a, 1 14b of the register cylinder 116 opens and transfers the leading edge of the sheet to a buffer system 1 19 arranged above the register cylinder 1 16, which has a first sheet guiding device 124, equipped with 0 blowing nozzles 122, on which the sheet 1 10 with its this time printed side floating down along. In the same way as the sheet guide device 24 of the previous embodiment, the sheet guide device 124 can have projections 126 which engage in corresponding grooves 128, indicated by a dash-dotted line, in the peripheral surface 118 of the 5 register cylinder 116. In addition, above the first

Sheet guiding device 124, a second further sheet guiding device 138 can be provided, which acts on the upper side of the sheet 110 via blowing / suction nozzles 136 with blowing air. The sheet guiding devices 124 and 138 can be used in an analogous manner to those previously described Sheet guiding devices 24 and 38 can be provided with appropriate format adjustments, roller and / or chain gripping devices or be formed by them, with the additional possibility that the lower first sheet guiding device 124 is designed as a suction belt as described above, or comprises one.

In the same way as the register cylinder 16 of the previously described embodiment, the register cylinder 116 has a peripheral surface 118 provided with suction openings 120, on which the sheet 110 is sucked and held. As a result of the rotation of the register cylinder 1 16, the sheet 110 sucked on the peripheral surface 1 18 is guided into the intermediate storage system 1 19 by the register cylinder 116 after opening the gripper devices 1 14a or 1 14b, the sheet 110 following with its printed side is moved below on an air cushion over the first sheet guide 124. As soon as the trailing edge of the sheet has passed the gripper center 132, this is gripped by a known pincer-reversing gripper device 134 of the second downstream impression cylinder 106. The pliers reversible gripper device 134 then lifts the sheet 110, beginning with its rear edge, from the circumferential surface 118 of the register cylinder 116, as indicated by the broken lines in FIG. 3, and guides the turned sheet 110 with the trailing edge ahead of the printing gap of the downstream printing unit to where the back of the sheet 1 10 is printed.

A preferred embodiment of a register cylinder is described below, as is used, for example, in the embodiments according to FIGS. 1 and 2 or the embodiment according to FIG. 3. The register cylinder 16, 116 shown in cross section in FIGS. 4 and 5 consists of a core 204 which is mounted so as to be stationary relative to the side wall 200a, 200b of the printing press or by means of a pneumatic or electrical adjusting device 202, around which a substantially hollow cylindrical casing body 206 is disposed Bearing 208a, 208b is freely rotatable. The casing body 206 can, for example, as shown in FIG. 5, be mounted in and in the side walls 200a, 200b of the printing press via pins 210a, 210b and cylinder bearings 209a, 209b M in a known manner via the pin 210a and a drive gear 214 are driven. In the casing body 206 of the register cylinder 16, 1 16, as shown in FIGS. 1 to 6, suction openings 20, 120 extending radially outward from the inner wall 216 of the casing body 206 to the peripheral surface 18, 1 18 are formed, via which the sheet 10, 1 10 is sucked onto the peripheral surface 18, 18. The peripheral surface 18, 1 18 in the preferred embodiment of the invention preferably has a rough structure, whereby the friction between the sheet 10, 1 10 and the peripheral surface 18, 1 18 is increased, which leads to an improved register stability during transport of the sheet 10, 110 leads into the intermediate storage system 19, 119.

In the preferred embodiment of the register cylinder 16, 116, the core 204 has one or more recesses 218 which are connected via a line 219 and a valve 221 to a vacuum source 220 and, as indicated by the broken lines in FIG. 5, with ambient air are ventilated. The suction openings 20, 120, which are located above the recess 218 and which communicate with the recess 218, are accordingly acted upon by suction air from the vacuum source 220. The remaining, not communicating with the recess 218, infant openings 20, 120 are closed by the outer peripheral surface 222 of the core 204, so that they are not acted upon by suction air.

When the casing body 206 of the register cylinder 16, 16 in the direction of arrow A rotates, the sheet 10, 110 is thus sucked in only in the partial section designated by α of the peripheral surface 18, 118 of the register cylinder 16, 116, in which the suction openings 20, 120 communicate with the recess 218.

In the preferred embodiments of the invention, in addition to the recess 218, further recesses 224 and 226, which are arranged upstream and / or downstream in the rotational direction A of the register cylinder 16, 16, are provided, which are separated from the recess 218 by intermediate walls, which are not described in more detail. The recesses 224 and 226 can preferably be subjected to a different pressure than that Recess 218. For example, in the embodiments according to FIGS. 1 and 2, it is advantageous if a negative pressure is likewise generated in the upstream recess 224 when the sheet 10 is transported in register, so that the sheet 10 is sucked into the associated circumferential surface section β he follows. The negative pressure can be less than, equal to or greater than the negative pressure in the recess 218. After the sheet 10 has been almost completely demanded in the intermediate storage system 19, the recess 224 can be ventilated via a valve, not shown, before or while the pliers reversible gripper device 30 of the transfer drum 2 grips the trailing edge of the sheet and lifts the sheet 10 from the register cylinder 16. This advantageously removes the suction of the sheet when the trailing edge of the sheet is lifted off the register cylinder 16, as a result of which the sheet 10 can be more easily detached from the peripheral surface 18, 118 of the register cylinder. By lifting the sheet trailing edge from the section ß of the circumferential surface 18 there is also the effect that the openings 224, 218 and 226 are automatically ventilated by the release of the suction openings 20 below the sheet 10, so that the sheet 10 is also without an additional external ventilation of the recesses can be easily lifted from the peripheral surface 18 of the register cylinder 16. In order to maintain the negative pressure in the recesses 218, 224 and 226 even when processing narrow sheet formats, the suction openings 20, 120 on the side of the sheet 10 are covered in this case, for example, by a sleeve, sleeve or bandage or closed in some other way, or for example switched off by valves.

Furthermore, it can be provided that the recess 226 is also subjected to a reduced, the same or increased negative pressure compared to the recess 218, or possibly also blown air. It is advantageous, for example, if the vacuum in the recess 226 is slightly lower than the vacuum in the recess 218 during the sheet transport, so that the sheet does not extend in the region γ of the peripheral surface 18, 118 of the register cylinder 16, 116 is sucked so strongly onto the peripheral surface 18, 118 and can be detached from it more easily. As soon as the sheet 10, 1 10 is inserted into the intermediate storage system 19 and the % Pliers reversible gripper device 30 the sheet trailing edge, or the sheet from the sections α, ß and γ of the peripheral surface 18, 1 18, the recess 226 is preferably ventilated by a valve, not shown, or even blown air. Likewise, the recess 218 and / or the recess 224 can be acted upon by blown air during the lifting of the trailing edge of the sheet by the gripper reversing gripper device 30. Furthermore, it is possible to permanently vent the recess 226 in order to fill the suction openings 20, 120 evacuated in the peripheral surface 18, 118 with air such that the sheet can be separated.

In the same way, the register cylinder 116 in the embodiment of the invention shown in FIG. 3 can also be provided in a corresponding manner with recesses 218, 224 formed in the core 204, which correspond to them

Circumferential surface sections α, β and γ are assigned. In this embodiment of the invention, all sections α, β and γ can be subjected to negative pressure during the insertion of the sheet leading edge of the sheet 110 into the intermediate storage system 119, in particular after the gripper device 1 14 has released the sheet leading edge, so that the sheet is sucked in over a large area the peripheral surface 1 18 of the register cylinder 116 is ensured. After the sheet end has passed the gripper center 132 and the pincer-reversing gripper device 134 of the downstream counter-pressure cylinder 106 has gripped the trailing edge of the sheet, in the preferred embodiment the suction air supply to the recesses 218 and 226 is interrupted or the recesses 218, 226 are ventilated or optionally blown air is applied, so that in the sections α and ß no suction of the sheet 1 10 on the peripheral surface 1 18 of the register cylinder 116 takes place. As a result, as well as the gradual release of the suction openings 120 in the circumferential surface section α, which inevitably leads to ventilation and thus to a reduction in the negative pressure in the recess 218, the sheet can be gently removed by the pliers reversing gripper device 134 without undue stresses Register cylinder 1 16 are lifted off. In the previously described embodiments of the register cylinder 16, 1 16 according to the invention, the circumferential surface sections α, β and γ can also be changed in size by means of adjusting devices (not shown).

In a further embodiment of a register cylinder 16, 116 according to the invention shown in FIG. 6, it can further be provided that the suction openings 20, 12 communicate with chambers 230 formed in the casing body 206, which preferably extend in the axial direction parallel to the cylinder longitudinal axis. In this embodiment of the invention, the chambers 230 are connected through an opening or bore 232 to the vacuum source 220, which is formed in a fixed flange element 234 arranged on the end face of the register cylinder 16, 116. At this

Embodiment of the invention, the bore 232 in the flange element 234 forms a rotary valve together with the axial chambers 230 in the casing body 206 of the register cylinder 16, 116. It can further be provided that 5 recesses 318, 324 and 326 corresponding to the recesses 224 and 226 of the previously described embodiments are formed in the flange connection 234, which communicate with one or more of the axial bores 230 and thus to provide a negative pressure supply for circumferential Surface sections α ', ß' and γ 'lead the

Circumferential surface portions α, β and γ correspond to the previously described embodiments.

The recesses 318, 324 and 326 can furthermore be ventilated independently of one another via valves (not shown) and, in addition, can be changed in size, for example, by slide devices, not shown, etc.

Finally, it can be provided to control each of the suction openings 20, 120 separately via an associated individual valve. Reference number list

Turning device transfer drum upstream counter-pressure cylinder downstream counter-pressure cylinder a first gripper device on the transfer drum b second gripper device on the transfer drum sheet to be printed gripper center gripper device on the register cylinder register cylinder circumferential surface of the register cylinder intermediate storage system sucking openings a blowing air nozzles of the first subsystem b blowing air nozzles of the first subsystem buffing device of the second subsystem second subsystem a first subsystem strips protrusions which engage in grooves in the register cylinder adjustment gears grooves in the register cylinder pliers reversible gripper device gripper center 34 gripper device of the downstream impression cylinder

36 blowing nozzles of the second sheet guiding device

38 second sheet guiding device

38a first section

38b second section

40 rolls

41 curved track

d distance between ends of the first and second sheet guiding devices

E reference point

104 first impression cylinder

106 second impression cylinder

112 gripper control center

114a first gripper device on register cylinder 116

114b second gripper device on register cylinder 116

1 16 register cylinders

118 peripheral surface

119 Buffer system

120 suction openings

124 first sheet guiding device

126 projections 28 grooves in the circumferential surface of the register cylinder 32 gripper center 36 blowing nozzles of the second sheet guide device 38 second sheet guide device 50 rubber blanket cylinders of the downstream printing unit 00a side wall of the printing press 20b side wall of the printing press 02 electrical / pneumatic adjusting device "8th

204 core of the register cylinder

206 jacket body

208a bearing between the casing body and core

208b Bearing between the casing body and the core

209a cylinder bearings

209b cylinder bearings

210a spigot

210b spigot

214 gear

216 inner edge of the casing body 206

218 recess in the register cylinder

219 line

220 vacuum source

221 valve

222 outer peripheral surface

224 upstream recess

226 downstream recess

230 axial chamber

232 hole in the flange element

234 flange element

318 recess in the flange element

324 recess in the flange element

326 recess in the flange element

A arrow

B double arrow

α circumferential surface suction section ß upstream circumferential surface abs « 13 γ downstream peripheral surface section

6 ß 'peripheral surface section on the register cylinder according to FIG. 6 γ' peripheral surface section on the register cylinder according to FIG. 6

Claims

claims

1.Turning device for a printing press, in particular a sheet-fed offset printing press, which takes over the sheet printed on one side from the impression cylinder of an upstream printing unit and transfers it, turned over, to the impression cylinder of a downstream printing unit, characterized by a register cylinder (16, 116) with a large number of over its circumference - Surface (18, 118) distributed suction openings (20, 120) which can be connected to a vacuum source (220) and through which the sheet (10, 110) for transferring the sheet trailing edge to a downstream cylinder (6, 106) is sucked in and held in register to be led.

2. Device according to claim 1, characterized in that control means (204, 206, 218, 224, 226; 230, 232, 234, 318, 324, 326) are provided, which in a predetermined peripheral surface portion (α, ß , γ; α ', ß', γ ') of the register cylinder (16, 116) connecting the suction openings (20, 120) to the vacuum source (220).

3. Apparatus according to claim 2, characterized in that the peripheral surface portion (α, ß, γ; α ', ß', γ ') assumes a position which is substantially fixed in relation to the printing press.

4. Apparatus according to claim 2 or 3, characterized in that the control means (204, 206, 218, 224, 226; 230, 232, 234, 318, 324, 326) by means of a fixed, essentially cylindrical core (204) with a recess (218, 224 , 226) and a cylindrical jacket body (206) rotatable about this stationary core (204) and having radial through bores.

5. The device according to claim 4, characterized in that the jacket body (206) forms the peripheral surface (18, 118) of the register cylinder (16, 116) and the radial through holes communicate with the suction openings (20, 120).

6. Device according to one of claims 4 or 5, characterized in that means (202) for rotating the cylindrical core (204) are provided.

7. Device according to one of claims 2 or 3, characterized in that the control means (204, 206, 218, 224, 226; 230, 232, 234, 318, 324, 326) by a on the end face of the register cylinder (16, 116) arranged rotary valve (232, 230, 234, 318, 324, 326) are formed which alternately connect the suction openings (20, 120) with chambers (230) running inside the register cylinder (16, 116) with the vacuum source (220) connects.

8. The device according to claim 2 or 3, characterized in that the control means (204, 206, 218, 224, 226; 230, 232, 234, 318, 324, 326) by individually and / or in groups controllable, the suction openings ( 20, 120) associated valves are formed. 21

9. Device according to one of the preceding claims, characterized in that the register cylinder (16, 116) has a rough surface.

10. Device according to one of the preceding claims, characterized in that on the register cylinder (16, 116) a gripper device (14, 114a, 114b) is provided, which the sheet (10, 110) before suction on the peripheral surface (18th , 118) registers at its front edge.

11. Device according to one of the preceding claims, characterized in that it is formed from a transfer device (2) arranged between the two counter-pressure cylinders (4, 6) of an upstream and a downstream printing unit, and a register cylinder (16, 116) arranged below the transfer device , wherein the transfer device (2) carries both a first gripper device (8a, 8b) for the sheet leading edge and a second gripper device (30) for the sheet trailing edge.

12. Device according to one of claims 1 to 10, characterized in that this is formed by a between the two impression cylinders (104, 106) of an upstream and a downstream printing unit arranged register cylinder (116) which the sheet (110) for the turn takes over by means of a gripper device (114a, 114b) from the first printing cylinder (106) on the leading edge of the sheet and transfers it with the trailing edge of the sheet to a gripping device (134) of the downstream printing cylinder (106), the gripper system (134) of the downstream printing cylinder (106) serving as a reversing gripper system is trained.

13. The device according to one of claims 2 to 12, characterized in that the peripheral surface portion (α, β, γ; α ¹ , β ', γ') of the register cylinder (16, 116) in further, separately with the vacuum source ( 220) connectable and / or ventilated sections.

14. Device according to one of the preceding claims, characterized in that an intermediate storage system (19, 119) is provided, to which the sheet (10, 110) with its leading edge is transferred from the register cylinder (16, 116).

15. Turning device for a printing press, in particular a sheet-fed offset printing press, which takes over the sheet printed on one side from the impression cylinder of an upstream printing unit and transfers it to the impression cylinder of a downstream printing unit, characterized in that an intermediate storage system (19, 119) is provided, which is a has the first sheet guide device (24, 124) communicating with the register cylinder (16, 116), which is formed from two subsystems (24a, 24b), the latter having comb-like strips (23).

16. The apparatus according to claim 15, characterized in that the subsystems (24a) and / or (24b) have blowing nozzles (22a, 22b).

17. Device according to one of claims 15 and 16, characterized in that the second subsystem (24b) has a rounded end portion.

18. Device according to one of claims 15 to 17, characterized in that a second sheet guide device (38) is provided, which is arranged between the end portion of the second subsystem (24b) and the downstream impression cylinder (6).

19. The apparatus according to claim 18, characterized in that the second sheet guiding device (38) is formed by two comb-like interlocking subsystems (38a, 38b), the first subsystem (38a) and / or the second subsystem (38b) with blowing nozzles (36 ) is occupied, which essentially point in the direction of the first sheet guiding device (24).

20. The apparatus according to claim 18, characterized in that the second sheet guide device (38) is formed by two subsystems (38a, 38b), each with closed and mutually aligned surfaces and blow nozzles embedded therein (36), both subsystems along one to the central axis of the Register cylinder (16, 116) parallel line are separated and movable independently.

21. Device according to one of claims 18 to 20, characterized in that the surface of the second sheet guiding device (38) from the rounded end portion of the first sheet guiding device (24) is arranged at such a distance (d) that the leading edge of the sheet upon entry into the end section is raised by the first sheet guiding device (24) and drawn in by the second sheet guiding device (38).

22. The apparatus according to claim 21, characterized in that an adjusting device (27, 40, 41) is provided which, when the sheet format is adjusted, the first and second subsystems (24a, 24b) of the first sheet guide device (24) and the first subsystem ( 38a) and the second subsystem (38b) of the second sheet guiding device (38) are displaced relative to one another in such a way that the distance (d) between the surface of the second sheet guiding device (38) relative to a reference point (E) on the rounded end section of the second subsystem ( 24b) of the first sheet guiding device (24) is essentially maintained.

23. The device according to claim 22, characterized in that the adjusting device on the first subsystem (38a) of the second sheet guide device (38) comprises rollers (40) which are guided in a curved path (41).

24. Device according to one of claims 19 to 23, characterized in that the first subsystem (38a) of the second sheet guiding device (38) can be moved into a position during the printing process of the printing press in which the blowing nozzles (36) towards the surface of the Show transfer drum (2).

25. The device according to any one of claims 15 to 24, characterized in that on the first sheet guide device (24) and / or the second

Sheet guide device (38) rolls are provided on which the sheet (10, 110) is guided.

26. Device according to one of claims 15 to 25, characterized in that the first sheet guiding device (24) comprises a suction belt to which suction air can be applied, on which the sheet (10, 110) rests.

27. The apparatus according to claim 26, characterized in that the suction belt is driven at a speed which substantially corresponds to the peripheral speed of the register cylinder (16, 116).

28. Device according to one of claims 15 to 26, characterized in that the intermediate storage system (19, 119) comprises one or more gripper devices which grip the sheet (10, 110) on the front edge and guide it in register.