DE102006053473B4 - Arrangement of a position sensor on a shaft of a drivable cylinder in a processing machine - Google Patents

Abstract

Printing machine with a on a shaft of a drivable cylinder (2) arranged position sensor (7) which is coupled to a torque arm (13, 14) which on the side frame (15) and the encoder housing (24) of the position sensor (7) is arranged wherein within the transmitter housing (24) a torsion-resistant stator is arranged within which a rotor designed as a hollow shaft is fixed on the cylinder shaft,
characterized,
the cylinder (2) has a position-adjustable cylinder axis (11),
the torque support (13, 14) is fixed to a bearing (18, 19) arranged on the cylinder (2) and the transmitter housing (24) of the position sensor (7) is connected to the bearing (18, 19).

Description

The The invention relates to an arrangement of a position sensor on a shaft of a drivable cylinder in a processing machine The preamble of claim 1. The arrangement is particularly suitable for one Offset printing machine with or without coating units or a painting machine at where a cylinder with a single drive is driven.

A positioner of this kind is out DE 199 04 471 A1 Known here as a rotary encoder, whose rotary encoder housing is fixed with an elastic holder on a rotary printing press. Centrally located in the encoder housing is a torsion-resistant stator, which is associated with a designed as a hollow shaft rotor. The rotary encoder is preferably attached with its hollow shaft to the drivable cylinder shaft and fastened by means of a clamping device.

Furthermore, it is off EP 0 812 683 A1 a positioner known. From decoupled preferably provided for the transport of the sheet material gear train a sheetfed offset printing press, a plate cylinder at least one offset printing unit by means of individual drive (direct drive) can be driven in a predeterminable manner. In a further development of the plate cylinder or the plate cylinder and the blanket cylinder for performing circumferential register corrections to the other cylinders can be driven. In a further embodiment of the plate cylinder and / or the blanket cylinder for performing pressure length corrections to the other cylinders are driven. Each blanket cylinder is associated with a position sensor, by means of which signals the direct drive of the respective plate cylinder on synchronous angular run with the respective associated rubber cloth cylinder is controllable.

Out EP 1 593 510 A2 a position sensor is known, which is mounted on a position-variable cylinder axis of a cylinder, for example the blanket cylinder, in a rotary joint and is coupled with transmission means with a mounted on the side frame pivot. One of the transmission means is coupled starting from the position sensor in the longitudinal extent equal to the contact zone of two cylinders end with a further transmission means in a rotary joint, which is coupled to the frame-fixed pivot.

According to DE 85 35 561 U1 a tachogenerator is known as a position encoder, which is arranged on a shaft of a printing press. The position sensor comprises a locking pin designed as a torque arm, which is arranged on a stator of the position sensor and a drive motor respectively. On the shaft of the drive motor designed as a hollow shaft rotor is fixed on which a stator bearing radial bearing is arranged.

Of the Invention is based on the object, a printing machine of the beginning further develop such a way that on the position encoder disturbing influences at least noticeable be reduced and the signal detection of the position encoder with higher accuracy he follows.

Is solved the task by the training features of claim 1. Further developments arise from the dependent ones Claims.

One the first advantage is that that with a cylinder with changeable Axial position, for example a blanket cylinder of an offset printing unit, the assigned plate / forme cylinder (cylinder with fixed axis position) in the offset printing unit with a direct drive (single drive) position-controlled is drivable by an improved synchronous angle run, in particular in a plate / form cylinder with a single drive, between the two cylinders is achievable.

When second advantage is to list that the setpoint for the plate / form cylinder position from the associated Blanket cylinder (in offset printing unit) with the aid of one position sensor each, in particular a rotary encoder, is removed. The signals are fed to a preferably central controller, which the respective individual drive of the plate / forme cylinder accordingly controls, so that independent from the cylinder position always a synchronous angle between a cylinder with fixed axle position and a cylinder with changeable Axial position guaranteed is.

One the third advantage is that that disturbing, on the positioner acting influences, for example Vibrations or tumbling movements, noticeably reduced or eliminated become. The signal detection of the position sensor is with higher accuracy realizable.

The Invention is intended to an embodiment be explained in more detail. Here are shown schematically:

1 an offset printing unit with position encoder,

2 a position sensor arrangement in front view.

According to 1 a known per se offset printing unit is shown, which is a first cylinder 1 , here a plate / form cylinder 1 , a second cylinder 2 , here a blanket cylinder 2 , as well as the substrate in the conveying direction 3 leading cylinder 4 , here as a printing cylinder 4 formed, has. The offset printing unit further comprises an inking unit 6 and if necessary, a dampening unit 5 , In this training is the plate / form cylinder 1 as a cylinder 1 with fixed axis position and the blanket cylinder 2 . 2 ' as a cylinder 2 . 2 ' with changeable axis position, in particular for pressure on / pressure off position, for printing material thickness adjustment or radial adjustment to the impression cylinder 4 , executed. The blanket cylinder 2 . 2 ' thus has a position-variable cylinder axis 11 . 11 ' on.

The plate / form cylinder 1 is with a self-propelled single drive 9 coupled drivable. The blanket cylinder 2 is from the single drive 9 separately drivable. For example, the blanket cylinder 2 integrated into the gear train of the drive train and driven by the main drive. This is on the blanket cylinder 2 a drive wheel 16 arranged, on which from the main drive a drive 23 can be fed. The plate / form cylinder 1 is further provided with a preferably arranged on the cylinder shaft second position encoder 8th coupled.

The second position encoder 8th and one on the blanket cylinder 2 arranged as a reference position encoder first position encoder 7 as well as the single drive 9 are circuitry and data technology with a machine control 10 coupled.

On the position-adjustable cylinder axis 11 the blanket cylinder 2 is the first position provider 7 stored, which with transmission means in the form of a torque arm 13 . 14 with one on a side frame 15 fixed to the frame arranged swivel 12 is coupled. Preferably, the first position encoder 7 on a cone 21 the blanket cylinder 2 stored.

In the present embodiment, the first position encoder 7 a rotary encoder, which with a first transmission element 13 coupled end. The first transmission element 13 has a longitudinal extent, which at the level of the contact zone 17 from plate / form cylinder 1 and blanket cylinder 2 ends. At this end is the second gear element 14 hinged, which with the frame-fixed swivel 12 is in functional connection. In training the transmission elements 13 . 14 as a coupling gear is thus a two-stroke, between the transmission elements 13 . 14 a free swivel 22 having. The free swivel 22 is preferably designed without play. The axis of the rotary joint 22 is equal to the contact zone 17 from plate / form cylinder 1 and blanket cylinder 2 arranged. In 2 this is shown by the dotted line.

The first position encoder 7 consists inter alia of a transmitter housing 24 which with the first, on a storage 18 . 19 supported transmission element 13 connected is. The transmission element 13 is supported by means of the second transmission element 14 on the side frame 15 (frame-fixed swivel 12 ), so that the position of the positioner 7 secured and twisting about the cylinder axis 11 is prevented. In the encoder housing 24 itself is rotationally fixed a stator within which is designed as a hollow shaft, on the pin 21 mounted fixed rotor.

Preferably, the second transmission element 14 a flexurally elastic element, such as a leaf spring, which with the torque arm 13 . 14 , especially the first transmission element 13 , at the level of the contact zone 17 is firmly connected. The second transmission element 14 This has enough deformability to absorb the radial movements and the rotations.

Between the first position encoder 7 and the first transmission element 13 is a bearing block 19 on the cone 21 the blanket cylinder 2 arranged. The bearing block 19 is on the blanket cylinder 2 , especially the pin 21 , by means of a radial bearing 18 supported. This can be the radial bearing 18 be designed as sliding or rolling bearings. The torque arm 13 . 14 , especially the first transmission element 13 , is on the bearing block 19 releasably fixed. Furthermore, on the bearing block 19 a bracket 20 arranged on the turn of the first position encoder 7 , especially the encoder housing 24 , is releasably fixed.

The torque arm 13 . 14 is thus at one on the cylinder 2 arranged storage 18 . 19 fixed and the encoder housing 24 of the first warehouse 7 is with storage 18 . 19 connected.

1

cylinder (Plate / form cylinder)

2

cylinder (Blanket cylinder)

3

conveying direction

4

pressure cylinder

5

dampening

6

inking

7

first position encoder

8th

second position encoder

9

individual drive

10

machine control

11

repositionable cylinder axis

12

frame fixed swivel

13

Torque arm (first Transmission member)

14

Torque arm (second Transmission member)

15

side frame

16

drive wheel

17

contact zone

18

radial bearings

19

bearing block

20

bracket

21

spigot

22

swivel

23

input drive

24

encoder housing

Claims (7)

Printing machine with one on a shaft of a drivable cylinder ( 2 ) ( 7 ), which is equipped with a torque arm ( 13 . 14 ), which on the side frame ( 15 ) and on the encoder housing ( 24 ) of the positioner ( 7 ) is arranged, wherein within the encoder housing ( 24 ) a torsion-resistant stator is arranged within which a rotor designed as a hollow shaft is fixed on the cylinder shaft, characterized in that the cylinder ( 2 ) a position-adjustable cylinder axis ( 11 ), that the torque arm ( 13 . 14 ) on one on the cylinder ( 2 ) arranged storage ( 18 . 19 ) and the encoder housing ( 24 ) of the positioner ( 7 ) with the storage ( 18 . 19 ) connected is. Arrangement according to claim 1, characterized in that the transmitter housing ( 24 ) by means of a holder ( 20 ) with the storage ( 18 . 19 ) connected is. Arrangement according to claim 1, characterized in that the torque arm ( 13 . 14 ) is formed by a two-layer, the first transmission element ( 13 ) at the storage ( 18 . 19 ) is releasably fixed and the second transmission element ( 14 ) on the side frame ( 15 ) is arranged. Arrangement according to claim 1 and 3, characterized in that the first transmission element ( 13 ) with a longitudinal extent equal to the contact zone of the cylinder ( 2 ) and an adjacent, further cylinder ( 1 ) is formed and the end of the transmission element ( 13 ) the second transmission element ( 14 ) is arranged. Arrangement according to claim 1, characterized in that the storage ( 18 . 19 ) by a on the shaft of the cylinder ( 2 ) arranged radial bearing ( 18 ) and one on the radial bearing ( 18 ) arranged bearing block ( 19 ) is formed. Arrangement according to claim 1, 2 and 5, characterized in that on the bearing block ( 19 ) the holder ( 20 ) and the torque arm ( 13 . 14 ) are arranged. Arrangement according to claim 1, characterized in that the cylinder ( 2 ) with position-adjustable cylinder axis ( 11 ) a blanket cylinder ( 2 ), which is coupled to a single-drive, as a plate cylinder ( 1 ) trained cylinder ( 1 ) is in functional connection.