WO2020224901A1

WO2020224901A1 - Blanket cylinder, printing unit and printing press, method for handling a rubber blanket, and use of actuatable actuators in a blanket cylinder

Info

Publication number: WO2020224901A1
Application number: PCT/EP2020/059875
Authority: WO
Inventors: Ronny Schwenke; Peter Jentzsch
Original assignee: Koenig & Bauer Ag
Priority date: 2019-05-03
Filing date: 2020-04-07
Publication date: 2020-11-12
Also published as: PL3962743T3; DE102019111510A1; CN113396062A; CN113396062B; EP3962743B1; EP3962743A1

Abstract

The invention relates to a blanket cylinder (6) for a printing unit (1) of a printing press for carrying at least one rubber blanket, wherein the blanket cylinder (6) has a continuous tensioning shaft (9) for clamping and tensioning a leading edge of the rubber blanket and/or a continuous tensioning shaft (9) for clamping and tensioning a trailing edge of the rubber blanket, wherein a tensioning shaft (9) for tensioning the rubber blanket is received so as to be rotatable about the rotational axis thereof, and wherein drive means are provided for the rotational drive of at least one tensioning shaft (9), wherein the drive means comprise at least one actuatable actuator (11) which is arranged in the blanket cylinder (6) and which serves for the drive of a tensioning shaft (9).

Description

Blanket cylinder, printing unit and printing machine, method for handling a blanket and use of controllable actuators in a blanket cylinder

The invention relates to a rubber cylinder, a printing unit and a printing machine with a rubber cylinder carrying at least one rubber blanket, a method for

Handling, in particular for the automated or manual tensioning, re-tensioning or releasing, of a rubber blanket on a rubber cylinder in a printing unit for a printing machine, in particular an offset printing machine, and the use of

controllable actuators in a rubber cylinder for rotary drive

Continuous expansion shafts for automated tensioning, re-tensioning and / or loosening of a rubber blanket.

In order to change a rubber blanket on a sheet-fed printing press, for example, the rubber cylinder is currently moved into the corresponding position. The old rubber blanket is relaxed manually or with an electrically operated screwdriver. First the tensioning spindle for the end of the fabric is relaxed and then the rubber blanket is released from the tensioning shaft. The operator then pulls out the blanket while the blanket cylinder is slowly rotating. Afterwards it is again manual or via

Cordless screwdriver releases the tensioning spindle from the beginning of the blanket and the blanket is completely removed. The new rubber blanket is installed in the reverse order. Then both clamping spindles are retightened with a torque wrench. After a set time or after a certain number of sheets, the blankets that have been replaced are drawn up. The entire procedure is very time-consuming and, with manual operation, also very strenuous.

DE 41 27 714 A1 discloses a device for fastening and tensioning a

Known printing blanket on a cylinder of a printing machine, which has a bore for actuating a clamping screw. The disadvantage of this solution is that always manual operator actions are necessary. There can be no automation.

From DE 92 18 269 U1 a device for tensioning a rubber blanket is known, wherein tensioning screws of a tensioning rail are operated by motors of a carrier that can be activated at the same time. The carrier has handles for handling and is placed on the clamping screws from outside the cylinder. Disadvantages of this solution are the great effort and the need to keep a suitable one

Carrier for the respective machine width.

DE 10 2005 008 241 A1 discloses a device for tensioning an elevator on a cylinder of a rotary printing machine with shaft sections divided into shaft sections

Expansion shafts are known, with a single adjusting drive which can be rotated by hand or by motor and which is arranged in the forme cylinder and acts in a rotating manner on a roller section for rotating the expansion shafts. The disadvantage of this solution is the extremely large effort with many components and the necessary rubber blankets. Furthermore, the actuation can be carried out either by hand or exclusively by motor, with manual intervention not being possible. In this case, the necessary error security cannot be achieved.

From DE 10 2007 057 455 B4 is a printing machine with

Printing plate manipulation device known, wherein actuators change a cylinder elevator after a Sol stwert comparison of an image inspection device in the axial and / or circumferential direction in its geometry. The actuators should act directly on the outer edge of the elevator. The elevator can be a rubber blanket

Be blanket cylinder. Disadvantages of this solution are the great effort and the susceptibility to failure of the large number of actuators. If an actuator fails, no further adjustments can be made, which results in a pressure interruption. From DE 10 2012 202 076 B3 a blanket cylinder of a rotary printing press is known, wherein a clamping spindle or clamping shaft for receiving the

Blanket leading edge and a tensioning spindle or tensioning shaft for receiving the blanket trailing edge is provided.

The invention is based on the object of providing an alternative rubber cylinder, an alternative printing unit or an alternative printing machine with a rubber cylinder carrying at least one rubber blanket or an alternative method for handling, in particular for automated or manual tensioning, retensioning or releasing, a rubber blanket on one To create blanket cylinders in a printing unit or a suitable use. In particular, the rubber blanket change should be at least partially automated or fully automated and / or possibly a manual intervention should be made possible.

According to the invention, the object is achieved by the features of an independent claim. Advantageous configurations emerge from the subclaims, the description and the drawings.

The invention has the advantage that an alternative rubber cylinder, an alternative printing unit or an alternative printing press with a rubber cylinder carrying at least one rubber blanket or an alternative method for handling, in particular for automated or manual tensioning, retensioning or releasing, a

Blankets on a rubber cylinder in a printing unit or a suitable one

Use is provided. It is also preferred to roll or

sheet-processing offset printing machine provided with at least one or more such printing units. In particular, the blanket change is at least partially automated or fully automated and / or, if necessary, manual intervention is enabled. According to an advantageous embodiment, a rubber blanket change or handling, in particular tensioning, re-tensioning or releasing, a rubber blanket can be simplified and / or at least partially or fully automated. With the option of manual or manual intervention, the

Functional reliability can be increased.

The continuous tensioning shafts or tensioning spindles, which have proven themselves in many respects, can advantageously be used for tensioning the rubber blankets. Instead of the manual drive means, an electric motor, preferably with an additional gear, is advantageously installed in the rubber cylinder for each tensioning shaft or tensioning spindle. The power supply is preferably provided via a rotary feedthrough of the

Blanket cylinder. The motor driver can accordingly be outside the

Rubber cylinder.

It is particularly advantageous to change the blanket using the automatic

Blanket tensioning without tools. The operator can, for example, preselect the rubber blanket change, with the machine positioning the rubber cylinder and / or already motorized relaxing the rubber blanket. The operator only has to pull out the blanket while the machine is rotating slowly. On the end of the cloth, the release can also be done by motor.

If the required blanket tension is reached during tensioning or re-tensioning, the power consumption increases due to the increasing resistance. When a maximum set current is reached, the motor driver switches off preferentially. The subsequent tensioning can then be done from the control center, for example.

Advantageously, existing guards on the printing tower do not have to be opened for this, and the rubber cylinder in question also does not have to be brought into a certain position. In order to avoid damage or to switch off when an end position is reached, switches or indirectly working initiators can interrupt the power supply to the motor. For example, a diode connected in parallel can enable the motor to be driven in the opposite direction. As soon as the end position has been left by means of the assigned diode, the motor can also be operated in both directions again.

For example, by current limitation, the desired torque can advantageously be achieved during tensioning, with tensioning with a

Torque wrench is no longer required. Re-tensioning after a while can also be done automatically. The printer can, for example, select the blanket tensioning function in the control room or at the printing unit. The machine can now automatically tension or re-tension the blankets in one, several or all plants, with manual operation no longer required. This saves considerable time and increases user friendliness.

Advantageously, the rubber blanket on a rubber cylinder in the printing unit, for example an offset printing machine, in particular a sheet-fed offset rotary printing machine, can be changed without tools. As a rule, manual clamping work is no longer necessary, which in addition to time savings thanks to the automatic

Re-tensioning also means a gain in comfort for the operator. The proven expansion shafts or tensioning spindles can preferably remain the same, which enables the use of the existing rubber blankets. In addition, the possible preselections, for example in the machine control, save a considerable amount of time.

The invention is to be explained below by way of example. The accompanying drawings show schematically: 1: Printing unit of a sheet processing machine with an inking and dampening unit;

2: a longitudinal section of the blanket cylinder with integrated electric motors for tensioning the blanket;

Fig. 3: Cross section of the rubber cylinder with arranged in the cylinder channel

Expansion shafts for receiving a rubber blanket;

4 shows a detail of a longitudinal section through a clamping screw that can be actuated by an electric motor;

5 shows a detail of a longitudinal section through a manually operable tensioning screw which is decoupled from an electric motor;

6: Clamping device with a sensor that determines the revolutions of the threaded spindle;

7: rubber cylinder with safety switches;

Fig. 8: Circuit diagram for motor control.

Fig. 1 shows, for example, a section of an offset printing machine,

for example a sheet-processing offset printing machine, in particular a sheet-fed offset rotary printing machine, preferably in aggregate and series construction. The machine contains one or more plants, which can be designed as plant, printing, lacquer, drying and / or finishing plants, for example. At least one of the works of the machine is equipped as a printing unit 1 with an inking or inking and dampening unit 2. Furthermore, the machine can contain a feeder for sheet feed and a delivery for discharging the processed sheets. A turning device can also be arranged between two units of the machine, with which the sheets can be turned over in perfecting.

In particular, the machine contains endlessly rotating sheet conveying systems that guide the sheets to be processed through the machine or pass them between the plants. Between the sheet conveyor systems, the sheets are, for example, in Pass the hook closure at the front edge. For example, the revolvingly driven sheet conveying systems can be sheet guiding cylinders driven in rotation, such as printing, transfer and / or transfer cylinders. The sheet conveyor systems or

Rotary bodies in the printing unit or units 1 can be driven, for example, by a drive gear train, in particular a continuous drive gear train. The sheet guide cylinders or the corresponding rotary bodies of the printing units 1 each have interlocking gearwheels which form the drive gear train. The drive train is driven by at least one main drive motor that can be controlled by a machine control. In a further development, further drives can also be connected to the drive wheel train by means of a motor or generator.

One or more units, in particular printing units 1, of the machine can, for example, each contain a printing cylinder 3, such a printing cylinder 3 in particular having an at least approximately full surface area for carrying the sheets. Between the printing cylinders 3, the sheets can, for example, from

Transfer drums 4 or transfer drums are transferred. The pressure cylinders 3 and the transfer drums 4 can preferably be made twice as large. One

double-size cylinder can in particular two sheets of maximum format

record on the circumference. The double-sized printing cylinders 3 and transfer drums 4 preferably each have gripper systems 5 for clamping the leading edges of the sheet. These gripper systems 5, which are arranged in particular diametrically to one another in gripper channels, clamp and thus hold the sheet to be processed on the printing cylinder 3 or on the transfer drum 4.

The machine, shown only in part, contains, for example, at least one printing unit 1 which applies or applies printing ink to the sheets during a printing process by means of an inking or inking and dampening unit 2. An inking or inking and dampening unit 2 of a printing unit 1 contains, in particular, in surface contact rotating bodies which can be brought or are in contact with one another, such as rollers and

Cylinder. In particular, a printing unit 1 of a sheet-processing machine contains in each case a forme cylinder or plate cylinder 7 and a transfer cylinder or blanket cylinder 6. A blanket cylinder 6 of a printing unit 1 interacts with one printing cylinder 3 and forms a printing gap with it. For example, the blanket cylinder 6 and the plate cylinder 7 can be made single-sized, single-sized cylinders being able to accommodate approximately an arc of maximum format on the circumference. Alternatively, the sheet guide cylinder or the

Rotary body of the printing units 1 but also other sizes or a different one

Have arrangement.

An inking or inking and dampening unit 2 of a printing unit 1 applies the corresponding printing ink to a printing plate clamped on the respective plate cylinder 7 in the printing process. A plate cylinder 7 is colored by at least one but preferably several rollers of the associated inking or inking and dampening unit 2 during its rotation. The inking or inking and dampening unit 2 has here, for example, an ink fountain (not shown further) with an ink chamber formed by the ink fountain with a ductor roller. The printing ink located in the ink chamber is preferably transferred from the ductor roller to subsequent ink transfer rollers or traversing rollers via ink gaps which can be adjusted in zones. The

Ink transfer rollers or traversing rollers distribute the printing ink in the inking unit before it is transferred to the printing plate tensioned on the plate cylinder 7 by inking rollers set on the plate cylinder 7. When unrolling the

Plate cylinder 7 on the rubber cylinder 6, the printing ink is transferred to the rubber cylinder 6 covered with a rubber blanket in accordance with the motif. In particular, a single rubber blanket or printing blanket is received by the blanket cylinder 6 at a leading end and at a trailing end. The leading end with respect to a direction of rotation of the blanket cylinder 6 in the printing process can also be used as a leading edge and the end trailing with respect to a direction of rotation of the blanket cylinder 6 in the printing process can also be referred to as the trailing edge.

In the printing gap to the printing cylinder 3, the printing ink is transferred from the blanket cylinder 6 to the sheet to be printed, which is conveyed by the printing cylinder 3 by means of a gripper system 5, in accordance with the motif. With a first inking roller, dampening rollers can be in operative connection, for example via a preferably switchable bridge roller. If dry offset is used, for example, no dampening unit is required. One, several or all rollers of the inking or inking and dampening unit 2 can, for example, be coupled to the drive train during the printing process and thus be driven by the main drive motor. Outside of the printing process, one, several or all of the rollers of the inking or inking and dampening unit 2 can from

Drive wheel train or main drive motor are separated and / or connected to an additional drive of the printing unit 1.

The plate cylinder 7 and the blanket cylinder 6 of a respective printing unit 1 preferably each have a cylinder pin on both sides, via which they are rotatably and optionally adjustable in the frame of the respective printing unit 1. Both plate cylinders 7 and blanket cylinders 6 preferably each have bearer rings, not shown, which are arranged on both sides. The plate cylinder bearer rings are in contact with the rubber cylinder bearer rings during the printing process and roll off one another under pressure. The plate cylinder 7 can be driven either by the drive gear train, in particular via a gear wheel from the drive gear train, or by an individual drive, for example a plate cylinder direct drive. A rotor of a plate cylinder direct drive can, for example, be mounted in alignment with the shaft of the plate cylinder 7 or drive the plate cylinder 7 independently of the other cylinders or rollers of the printing unit 1. The drive can take place in the printing process and / or outside the printing process, for example in a washing process. Fig. 2 shows a longitudinal section of a rubber cylinder 6, for example a machine described above, with integrated drive means or actuators for

Blanket tension. The blanket cylinder 6 has a continuous, d. H. in particular one-piece or format width, tensioning shaft 9 for clamping and tensioning a leading edge of the rubber blanket and a continuous, d. H. in particular one-piece or format-wide tensioning shaft 9 for clamping and tensioning a trailing edge of the rubber blanket, the tensioning shafts 9 being rotatably accommodated for tensioning the rubber blanket about their respective axis of rotation. The expansion shafts 9 are preferably designed with a diameter that is constant over the format width. The

Expansion shafts 9 each have, in particular, an axis of rotation oriented parallel to and spaced from the axis of rotation of the blanket cylinder 6. In particular, the expansion shafts 9 can be parallel to each other or in a cylinder channel 8 of the

Rubber cylinder 6 be arranged. The drive means for the rotary drive of a respective tensioning shaft 9 here comprise at least one in the rubber cylinder 6

arranged controllable actuator.

Particularly preferred actuators are an electric motor 11 for the tensioning shaft 9 for clamping and tensioning the leading edge of the rubber blanket or a

Electric motor 11 is provided for the tensioning shaft 9 for clamping and tensioning the trailing edge of the rubber blanket in the rubber cylinder 6. The electric motors 11 are preferably arranged in the rubber cylinder body in such a way that their rotors are arranged parallel to the axis of rotation of the rubber cylinder 6, while their stators are fixedly arranged, in particular screwed, in the cylinder body. Preferably, a gear, for example an angular planetary gear 12, can be provided for each electric motor 11, which is in particular firmly connected on the input side to the respective rotor of the electric motor 11. On the output side, for example, a gear member can be arranged radially to the blanket cylinder 6. Particularly preferably, both electric motors 11, each with an associated gear, in particular angular planetary gear 12, are provided approximately in the center of the rubber cylinder 6. In particular, a separately controllable electric motor 11 is assigned to each tensioning shaft 9. In particular, the motor driver of one or both electric motors 11 can be located in the E-vessel, wherein the current can preferably be conducted to the rubber cylinder 6 via a rotary leadthrough. The automatic tensioning device is particularly preferably installed exactly twice per blanket cylinder 6, so that the blanket tension for the start of printing and the end of printing can be set together or separately. Several or all of the blanket cylinders 6 of the machine preferably have actuators designed in this way, in particular electric motors 11. The electric motors 11 can preferably be activated, in particular electronically, by the control device or the machine control system, preferably via a motor driver.

3 shows a cross section of the rubber cylinder 6 with the expansion shafts 9 arranged in the cylinder channel 8 for receiving a rubber blanket. In particular, the tensioning shaft 9 for clamping and tensioning the leading edge of the rubber blanket and the tensioning shaft 9 for clamping and tensioning the trailing edge of the

Blankets each have a suspension 10 for the blanket. A suspension 10 of a tensioning shaft 9 can be a recess in the tensioning shaft 9 which is arranged radially to the tensioning shaft 9 and which preferably extends over the entire width of a rubber blanket to be used. For example, a suspension 10 can also extend over the entire width of a tensioning shaft 9 or be a longitudinal groove. In particular, a respective format-wide suspension 10 thus extends over the maximum width of a printing material that can be processed by the machine, the width extending from one machine side wall to the other machine side wall. By rotating a tensioning shaft 9 about its axis of rotation, the suspension 10 is displaced in the circumferential direction of the tensioning shaft 9 and it can be in a first

Direction of rotation a suspended rubber blanket pulled or tightened and in a opposite direction of rotation, the blanket can be loosened or removed. A cylinder segment is particularly preferably arranged between the expansion shafts 9, for example at the level or slightly below the periphery of the rubber cylinder 6. The cylinder segment can be formed integrally on one or preferably on both expansion shafts 9.

In particular, each tensioning shaft 9 is assigned a threaded spindle or tensioning screw 13 which is approximately or exactly radially oriented with respect to the rubber cylinder 6 and has an axis of rotation correspondingly oriented radially to the rubber cylinder 6. A respective clamping screw 13 has an external thread with a preferably flat pitch and extends through a threaded plate 14 which is connected to the external thread

Has corresponding internal thread. A clamping screw 13 can, for example, be moved in a rotational manner by an electric motor 11 via the transmission, specifically angular planetary gear 12. The rotary movement can take place in both directions.

The threaded plate 14 is held in such a way that upon rotation of the

Clamping screw 13, the threaded plate 14 can be displaced or is displaced radially to the blanket cylinder 6. Preferably, a respective threaded plate 14, as shown in FIG. 2, can be connected on both sides via sliding blocks 15A, 15B and couplings 16A, 16B to a tensioning shaft 9, with one in the event of radial displacement of the threaded plate 14

Rotational movement of the tensioning shaft 9 is effected about its own axis of rotation. The couplings 16A, 16B can, for example, be arranged parallel to one another or radially to the respective tensioning shaft 9. The couplings 16A, 16B and the sliding blocks 15A, 15B connected to them and guided by the threaded plate 14 can be designed with mirror symmetry. About both sliding blocks 15A, 15B is one

Rotation of the threaded plate 14 is prevented. The tensioning device for the further tensioning shaft 9 is preferably designed analogously or in a mirror-inverted manner and is not shown further. Is preferred between an actuator, in particular an electric motor 11, and one

Tension shaft 9 is provided with a releasable coupling connection. For example, a coupling connection that can be released manually or by means of a tool can be provided between the gear, in particular angled planetary gear 12, and the clamping screw 13. A gear element of a clamping screw 13 is particularly preferred,

in particular a push rod 17, received inside. The push rod 17 can be displaced within the clamping screw 13, with a compression spring 18 the

Holds push rod 17 in an outer position. In this outer position close to the cylinder jacket, an engagement opening for the tool is closed or covered by the push rod 17. The engagement opening can, for example, be the inner wall of the

Be clamping screw 13. The engagement opening can have an engagement point or a driving profile, in particular an Allen shape, of the clamping screw 13. The engagement opening is preferably arranged between the expansion shafts 9

Cylinder segment arranged slightly below the periphery of the rubber cylinder circumference. Both clamping screws 13, which can be connected to an electric motor 11, are preferably at the same height or in the same surface line of the

Rubber cylinder circumference.

The compression spring 18 holding the push rod 17 in an outer position preferably simultaneously provides a connection to the flange of the transmission, in particular

Angular planetary gear 12, connected lock 19 with the clamping screw 13 ago. The displaceable lock 19 can for example be designed with a spline. The lock 19 is preferably pressed against a surface of the clamping screw 13, so that this produces a form-fitting and / or non-positive, in particular torsionally rigid, connection between the lock 19 and the clamping screw 13. By shifting the push rod 17 against the compression spring 18, in addition to the compression spring 18, the lock 19 is also shifted in such a way that the connection between the clamping screw 13 and the lock 19 is released or canceled. This is used by the Clamping screw 13 displacing push rod 17 a coupling connection,

in particular between lock 19 and clamping screw 13, established or released.

4 shows a detail of a longitudinal section through a clamping screw 13 which can be actuated by an electric motor 11 and which displaces the threaded plate 14 when rotated accordingly. The push rod 17 is held in its outer position by the compression spring 18, at the same time a coupling connection of the lock 19 connected to the gear, in particular the angular planetary gear 12, to the clamping screw 13 is established. In the outer position, an engagement opening or a

Driving profile, for example a hexagon socket 20, of the clamping screw 13 closed by the push rod 17.

FIG. 5 shows a detail of a longitudinal section through a manually operable tensioning screw 13 which is decoupled from an electric motor 11 and which displaces the threaded plate 14 upon corresponding manual rotation. By shifting the push rod 17 within the clamping screw 13 against the spring force of the compression spring 18, for example by a tool, the engagement opening, in particular the hexagon socket 20, is automatically released for the tool. At the same time, the

The coupling connection between the electric motor 11 and the clamping screw 13 is released. In particular, the push rod 17 in the inner position

The coupling connection of the lock 19 to the clamping screw 13 connected to the transmission, in particular angled planetary gear 12, is released or canceled. The push rod 17 preferably has a collar on the side towards the center of the cylinder and is thus protected against loss. An additional backup is not necessary.

Fig. 6 shows, for example, a clamping device with a die

The sensor, in particular an inductive sensor 21, which determines the revolutions of the threaded spindle. In this case, one is preferred in the clamping device for the clean cloth spindle

Built-in inductive sensor 21, which the number of Absorbs threaded spindle revolutions. For example, one pulse is output per revolution. This ensures that when the rubber blanket is inserted on the

Print start page automatically a certain number of revolutions of the

Clamping screw 13 can be biased.

Then the blanket can be pulled onto the blanket cylinder 6 and hung and tensioned in the print end side. Then, preferably one after the other, the finished clamping takes place with the desired torque. For example, by adapting the voltage supply of the electric motor or motors 11, the speed or the clamping time can be adapted. The output torque can preferably be determined by adapting the current.

7 shows a rubber cylinder 6 with safety switches, in particular

Limit switches S1.1, S1.2, S2.1, S2.2. To avoid mechanical damage to the components when reaching the end positions or getting stuck, the

Power supply interrupted. For this purpose, limit switches S1.1, S1.2, S2.1, S2.2 are installed, which interrupt the circuit when an upper or a lower limit position is reached. In parallel to the limit switches S1.1, S1.2, S2.1, S2.2, diodes are installed which enable a respective electric motor 11 to be rotated out of the relevant limit position. If the expansion shafts 9 have left the area of the end positions again, the end position switches S1.1, S1.2, S2.1, S2.2 close again and rotation in both directions is possible.

8 shows a circuit diagram for the two electric motors 11 arranged in the blanket cylinder 6, which are supplied with power via a rotary lead-in.

Depending on the translation and the efficiency between an electric motor 11 and a tensioning shaft 9, the current gives the resulting tensioning torque or the resulting tensioning force. In order to always achieve a clamping force that is approximately the same, the voltage supply of the electric motors 11 is when a nominal current is reached switched off. A current-voltage converter outputs the required signal for this. Furthermore, the current-voltage converter can be used to determine whether the

Electric motors 11 are still turning or whether the limit switches S1.1, S1.2, S2.1, S2.2 have already been reached.

As to the mode of operation: Via a rotating threaded spindle or clamping screw 13 and sliding pieces such as sliding blocks 15A, 15B and couplings 16A, 16B, a respective clamping shaft 9 is relaxed or relaxed. The tensioning screws 13 or tensioning shafts 9 are driven in particular by a respective controllable electric motor 11. The actuation can be remotely controlled from the connected control device or the

Machine control. The preferably used electric motors 11 direct a torque via a respective gear, especially angular planetary gear 12, to the respective tensioning screw 13. An additional brake of the tensioning screw 13 is not necessary because the low thread pitch of the tensioning screw 13, the

Electric motor 11 or the angular planetary gear 12 sufficient self-locking is achieved to prevent unintentional relaxation during operation.

From the flange or guide flange of the gearbox, especially the

Angled planetary gear 12, the torque is transmitted, for example, by means of a splined hub profile, which enables the lock 19 to be displaced axially. For example, a bore for counting the revolutions can preferably be provided. In particular, the counting can take place by the inductive sensor 21.

When the lock 19 is closed (which is not pushed by the push rod 17 against the

Compression spring 18 is shifted) the torque is transmitted from the transmission output via the screwed-on flange to the lock 19, preferably via the spline shaft profile. From there the torque is transmitted to the clamping screw 13, for example via a slot and the matching rectangular profile. Other profiles can also be used. When the lock 19 is depressed (which is displaced, for example, by the push rod 17 against the compression spring 18), the rectangular profile is pushed out of the slot and no longer forms a positive connection. The torque transmission from the tensioning screw 13 to the tensioning shaft 9 can thus be achieved via the driving profile,

For example, the hexagon socket 20, the clamping screw 13 take place. If the lock 19 is released, the compression spring 18 pushes the lock 19 again in the direction of the tensioning screw 13. By turning the electric motor 11, a rectangular profile and slot are found, so that the lock 19 is locked and can again transmit torque.

The inductive sensor 21 preferably detects the number of revolutions of the tensioning screw 13 for the front edge of the rubber blanket. If an old rubber blanket has been stretched out, the expansion shafts 9 are in the “rubber blanket relaxed” position. A new rubber blanket is first inserted into the expansion shaft 9 on the start of print page. in the

Connection the clamping screw 13 is pretensioned a few turns. Among other things, to prevent the rubber blanket from falling out. If the blanket is changed by hand, the revolutions for pre-tensioning are counted. With the motor

At high speeds on the side of the beginning of the blanket, the number of revolutions is detected by the sensor, in particular inductive sensor 21, and when a previously programmed number of revolutions is reached, the electric motor 11 is switched off. This function is only of interest for the leading edge, as it is on the

The rear edge is always clamped until the nominal torque is reached.

If, for example, the maximum tightening torque of the

When the clamping screw 13 is reached, the power consumption increases and the motor driver switches off the voltage supply of the electric motor 11 in particular. If, for example, the upper or lower end position of the threaded plate 14 on the clamping screw 13 is reached without increasing the power consumption, a directly or indirectly working safety switch opens, in particular limit switches S1.1, S1.2, S2.1, S2.2, and the electric motor 11 stops so as not to destroy any components. Particularly preferably, diodes provided in the circuit enable the electric motor 11 to rotate in order to move out of the end position again.

In particular, a respective clamping screw 13 can be manually rotated by means of an emergency release in order to change the rubber blanket in the event of failure of the

To enable clamping device, for example an actuator such as an electric motor 11. For manual tensioning, re-tensioning or loosening of a rubber blanket on a rubber cylinder 6 in a printing unit 1 of an offset printing machine, for example a sheet-fed offset rotary printing machine in aggregate and in-line construction, a coupling connection to the im Rubber cylinder 6 arranged actuator, in particular electric motor 11, released and / or a

Engagement opening or an entrainment profile, in particular a hexagon socket 20, can be released for manual rotary drive of a tensioning shaft 9.

The gear element, in particular the push rod 17, can preferably be displaced by an inserted tool, in particular an Allen tool. In this case, the push rod 17 received within a clamping screw 13 is preferably displaced by the tool against a spring force of a pressure spring 18. By means of the tool, the push rod 17 mounted or guided within the tensioning screw 13 is displaced radially to the rubber cylinder 6 on its axis of rotation, in particular at the same time releasing a coupling connection to the actuator arranged inside the rubber cylinder 6, in particular the electric motor 11 or angular planetary gear 12. The engagement point or the

Clamping screw 13 having driving profile, in particular hexagon socket 20, can then be turned manually by the tool. When the clamping screw 13 is rotated, transmission means or coupling elements, for example the sliding blocks 15A, 15B sliding on the threaded plate 14, are connected to the clamping shaft 9 connected coupling 16A, 16B, causes the rotation of the corresponding tensioning shaft 9 in the desired direction. The further clamping screw 13 can be turned manually in the same way.

The actuators arranged in the rubber cylinder 6, in particular electric motors 11, can each be inserted or used for the automated tensioning, retensioning and / or releasing of the rubber blanket on the rubber cylinder 6. An operator can change the rubber blanket, for example at the control station via the

Machine control are preselected, the machine positioning one, several or all of the blanket cylinders 6 and / or one, several or all of the rubber blankets already relaxed by a motor. In particular, the motor driver for controlling the electric motor or motors 11 is connected to the control device or the machine control and commands for tensioning or releasing the rubber blanket are to be entered or entered into the control device or the machine control by the operator. For example, the control station, an operator panel or a mobile operator control unit can be used for input. The tensioning and / or releasing of blankets on several or all of the blanket cylinders 6 in the printing units 1 can be coordinated in particular by the machine control. The operator or operators can

corresponding old blankets are removed and the new blankets can be inserted without tools. The blankets can also be pretensioned without tools. After the new blankets have been used, these blankets can be tensioned automatically.

Furthermore, the motor driver for controlling the electric motor (s) 11 is connected to the control device or the machine control system in such a way that intervals for retensioning the rubber blanket or blankets in the control device or the

Machine control can be stored. Predefined intervals can result from time specifications or the number of revolutions or arcs. Alternatively or additionally, the control device or the Machine control but also commands for re-tensioning the blanket or blankets can be given by the operator. By the control device or the

Machine control, retensioning of the blanket or blankets can be coordinated at suitable times. For example, a re-tensioning between

Print jobs and / or take place without a machine stop. By using the

controllable or remotely controllable actuators, in particular electric motors 11, in one or all of the rubber cylinders 6 for the rotary drive

Tensioning shafts 9, an automated retensioning of the rubber blanket or blankets takes place after a command from an operator or after the predetermined intervals. The retensioning can be carried out independently of the angle of rotation of a blanket cylinder 6, and no guards have to be actuated.

List of the reference symbols used

1 printing unit

2 inking or inking and dampening units

3 pressure cylinders

4 transfer drum

5 gripper systems

6 rubber cylinders

7 plate cylinders

8 cylinder channel

9 expansion shaft

10 suspension

1 1 electric motor

12 angular planetary gears

13 clamping screw

14 threaded plate

15A, 15B sliding block

16A, 16B coupling

17 push rod

18 compression spring

19 Lock with spline profile

20 hexagon socket

21 inductive sensor

51.1 Limit switch side 1 in released direction

51.2 Limit switch side 1 in tensioned direction

52.1 Limit switch side 2 in released direction

52.2 Limit switch side 2 in tensioned direction

Claims

Expectations

1. Blanket cylinder (6) for a printing unit (1) of a printing machine to carry

at least one rubber blanket,

wherein the rubber cylinder (6) has a continuous tensioning shaft (9) for clamping and tensioning a leading edge of the rubber blanket and / or a continuous tensioning shaft (9) for clamping and tensioning a trailing edge of the

Has rubber blankets,

wherein a tensioning shaft (9) for tensioning the rubber blanket is rotatably received about its axis of rotation and

wherein drive means are provided for rotationally driving at least one tensioning shaft (9),

characterized,

that the drive means comprise at least one controllable actuator (11) arranged in the rubber cylinder (6) for driving a tensioning shaft (9).

2. Rubber cylinder (6) according to claim 1, wherein the tensioning shaft (9) for clamping and tensioning the leading edge of the rubber blanket and / or the tensioning shaft (9) for clamping and tensioning the trailing edge of the rubber blanket has a suspension

(10) for the rubber blanket.

3. rubber cylinder (6) according to claim 1 or 2, wherein the tensioning shaft (9) for clamping and tensioning the leading edge of the rubber blanket and / or the tensioning shaft (9) for clamping and tensioning the trailing edge of the rubber blanket is one of the maximum width to be processed has a corresponding format-width suspension (10) for the rubber blanket.

4. rubber cylinder (6) according to claim 1, 2 or 3, wherein the actuator is an electric motor

(11) for the tensioning shaft (9) for clamping and tensioning the leading edge of the rubber blanket and / or an electric motor (11) for the tensioning shaft (9) for clamping and tensioning of the trailing edge of the rubber blanket is provided in the rubber cylinder (6).

5. rubber cylinder (6) according to claim 1, 2, 3 or 4, wherein one or in each case one actuator (11) actuates a clamping screw (13) which is oriented radially with respect to the rubber cylinder (6) and which when rotated via gear means (14, 15A, 15B, 16A, 16B) causes a rotational movement of an associated tensioning shaft (9).

6. rubber cylinder (6) according to claim 1, 2, 3, 4 or 5, wherein the drive means have a releasable coupling connection (13, 19) between an actuator (11) and a tensioning shaft (9).

7. rubber cylinder (6) according to claim 1, 2, 3, 4, 5 or 6, wherein the drive means have a manually and / or by means of a tool releasable coupling connection (13, 19) between an actuator (11) and a tensioning shaft (9) .

8. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the drive means each have a releasable coupling connection (13, 19) between an actuator (11) and an associated tensioning shaft (9).

9. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the drive means each have a manually and / or detachable coupling connection (13, 19) between an actuator (11) and a tool have associated clamping shaft (9).

10. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein with a

Actuator (11) a threaded plate (14) penetrating clamping screw (13) is rotatably drivable, which in its interior receives a push rod (17) displaceably.

11. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein a rotatable clamping screw (13) by shifting one within the An engagement opening (20) for a tool can be released against a compression spring (18) and / or a connection to the actuator (11) can be released.

12. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, wherein for each tensioning shaft (9) as an actuator an electric motor (11) with a parallel to

Rotation axis of the rubber cylinder (6) arranged rotor and / or a gear or angular planetary gear (12) is provided.

13. Rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, wherein an electric motor (11) with an associated gear (12) or as an actuator

Angular planetary gear (12) is provided for each expansion shaft (9).

14. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, wherein an electric motor (11) with an associated gear (12) or as an actuator

Angular planetary gear (12) is provided for each tensioning shaft (9) approximately in the middle of the rubber cylinder (6) and / or adjacent to a cylinder channel (8) in the rubber cylinder (6).

15. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14,

a clamping screw (13) having an external thread is provided for each clamping shaft (9), with a threaded plate (14) having an internal thread being displaceable radially to the rubber cylinder (6) by a clamping screw (13) when the clamping screw (13) is rotated and when moving a

Threaded plate (14) a respective tensioning shaft (9) can be displaced about its axis of rotation via gear means (15A, 15B, 16A, 16B) provided on both sides of the threaded plate (14).

16. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15, wherein the continuous tensioning shaft (9) for clamping and tensioning the

leading edge of the blanket and / or the continuous expansion shaft (9) for clamping and tensioning the trailing edge of the rubber blanket is made in one piece and / or format wide.

17. rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or

16, whereby the continuous tensioning shaft (9) is designed for clamping and tensioning the leading edge of the rubber blanket and / or the continuous tensioning shaft (9) for clamping and tensioning the trailing edge of the rubber blanket with a diameter that remains constant over the format width of the rubber cylinder (6).

18. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17, wherein the drive means one or for each tension shaft (9) each comprise an electronically controllable actuator (11) arranged in the blanket cylinder (6) for the rotary drive of the expansion shafts (9).

19. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 or 18, wherein an actuator (11) drives a gear (12) for tensioning the rubber blanket in a first direction and for relaxing the rubber blanket in a second opposite direction.

20. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,

17, 18 or 19, wherein the rubber cylinder (6) has at least one cylinder channel (8) for receiving the expansion shafts (9) and at least one actuator (11) for driving a expansion shaft (9) at least partially outside the cylinder channel (8) in the cylinder body is arranged.

21. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,

17, 18, 19 or 20, one or more actuators (11) being supplied with voltage via a rotary feedthrough of the rubber cylinder (6).

22. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,

17, 18, 19, 20 or 21, with a motor driver for the actuator or actuators (11) located outside the rubber cylinder (6).

23. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,

17, 18, 19, 20, 21 or 22, a control device or machine control being provided which controls a rotary drive of the rubber cylinder (6) and the actuator or actuators (11) of the rubber cylinder (6) in a coordinating manner.

24. Blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,

17, 18, 19, 20, 21, 22 or 23, with a sensor (21) for monitoring the movement of the tensioning shaft (9) for clamping and tensioning the leading edge of the

Rubber blanket is provided.

25. Printing unit (1) with a rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 or 24, wherein the rubber cylinder (6) can be colored with one of an inking or inking and dampening unit (2)

The plate cylinder (7) carrying the printing plate is in contact and / or with a

Printing cylinder (3) is in operative connection for inking printing material.

26. Printing machine with several printing units (1), the printing units (1) each having a rubber cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25.

27. Sheet-fed offset rotary printing machine in aggregate and series design with several essentially structurally identical printing units (1), the printing units (1) each having a blanket cylinder (6) according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or 26.

28. A method for handling a rubber blanket on a rubber cylinder (6) in a printing unit (1) for a printing press, wherein the rubber cylinder (6) has a continuous tensioning shaft (9) for clamping and tensioning a leading edge of the rubber blanket and / or a continuous tensioning shaft (9) for clamping and tensioning a trailing edge of the

Has rubber blankets,

wherein a tensioning shaft (9) rotates about its axis of rotation for tensioning the rubber blanket and

wherein drive means drive a tensioning shaft (9) in rotation,

characterized,

that as drive means one or per tensioning shaft (9) an actuator (11) arranged in the rubber cylinder (6) for driving the tensioning shaft (9) is controlled.

29. The method according to claim 28, wherein one or each tensioning shaft (9) an actuator (11) arranged in the rubber cylinder (6) for driving the tensioning shafts (9) is electronically controlled as drive means.

30. The method of claim 28 or 29, wherein the actuator or actuators are electric motors (11) and the control of the electric motor or motors (11) by means of a

Rotary introduction takes place via manipulation of voltage and / or current strength.

31. The method according to claim 28, 29 or 30, wherein the actuator or actuators (11) are controlled by a motor driver arranged outside the rubber cylinder (6).

32. The method according to claim 28, 29, 30 or 31, wherein an electric motor (11) as an actuator switches off automatically when the current consumption exceeds a set current level.

33. The method according to claim 28, 29, 30, 31 or 32, wherein a safety switch (S 1.1, S1.2, S2.1, S2.2) automatically switches off an actuator (11) or electric motor (11) when an end position is reached .

34. The method according to claim 28, 29, 30, 31, 32 or 33, wherein a diode can be used to reverse the direction of rotation of an actuator (11) or electric motor (11) from an end position.

35. The method of claim 28, 29, 30, 31, 32, 33 or 34, wherein the or the

Actuators (11) can be used for the automated tensioning, retensioning and / or releasing of the rubber blanket on the rubber cylinder (6).

36. The method according to claim 28, 29, 30, 31, 32, 33, 34 or 35, wherein an operator preselects the rubber blanket change, the machine positioning the rubber cylinder (6) and / or already motorized relaxing the rubber blanket.

37. The method of claim 28, 29, 30, 31, 32, 33, 34, 35 or 36, wherein the

Tension shaft (9) for clamping and tensioning the leading edge of the

Blankets with a new blanket attached to one or more

Revolutions is biased.

38. The method of claim 28, 29, 30, 31, 32, 33, 34, 35, 36 or 37, wherein a

Pre-tensioning a new rubber blanket by means of the tensioning shaft (9) for clamping and tensioning the leading edge of the rubber blanket is monitored by means of a sensor (21).

39. The method according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, wherein a blanket change by means of automatic blanket relaxation and

The blanket is tensioned without tools.

40. The method according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38 or 39, wherein a tensioning, retensioning and / or loosening of the blanket on the blanket cylinder (6) regardless of the rotational angle of the Rubber cylinder (6) takes place.

41. The method according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40, wherein a motor driver for controlling the actuator or actuators (11) with a

Control device or the machine control is connected and the

Control device or the machine control commands for tensioning or releasing the rubber blanket are entered.

42. The method according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 or 41, wherein a machine control for controlling actuators (11) of several rubber cylinders (6) in several Printing units (1) is provided and the machine control coordinates the tensioning and / or releasing of blankets on several or all of the blanket cylinders (6) in the printing units (1).

43. The method according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 or 42, wherein a motor driver for controlling the actuator or actuators (11) with a control device or the machine control is connected and with intervals for retensioning the rubber blanket in the control device or the

Machine control are stored and / or commands for retensioning the rubber blanket of the control device or the machine control are entered.

44. The method according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42 or 43, wherein a machine control for controlling actuators (11) of several rubber cylinders ( 6) is provided in several printing units (1) and the machine control system coordinates the retensioning of blankets on several or all of the blanket cylinders (6) in the printing units (1).

45. Use of remotely controllable actuators (11) in a rubber cylinder (6) for the rotary drive of continuous expansion shafts (9) for the automated tensioning, re-tensioning and / or releasing of a rubber blanket after a command from a

Operator or at specified intervals.