DE10047725A1 - Printing machine main drive operating method incorporates operating parameter adjustment for indirect compensation of expected torque variations - Google Patents

Abstract

The operating method uses detection of repetitive torque variations and a rotation angle source (9) for providing a torque characteristic dependent on the rotation angle, fed to the machine control (8) for the main drive motor (6) of the printing machine (10), for indirect compensation of the expected torque variations via operating parameter adjustment.

Description

The invention relates to a method for operating a main drive for printing presses NEN.

A main drive for a printing press is known from DE 195 08 082 A1. This main drive consists of one of several connected by a gear train Main drive motor associated with printing units, one rotary numerator and a speed control device, with the speed control device connected speed detector is assigned to a rotary element of the printing press.

The disadvantage here is that load fluctuations caused by torque fluctuations conditions, for example due to the actuation of grippers, so far only indirectly via the controller the decreasing speed due to the flange directly on the main drive motor Speedometer machine can be detected. This is only a late detection of moments fluctuations and in connection with this the late reaction to this event is possible Lich. If the controller is made very sensitive, e.g. B. by high P and I components in the controller program, there is always a risk of the drive system vibrating.

The object of the invention is to provide a method for operating a main drive esp for presses with compensation of torque fluctuations.

According to the invention the object is achieved by the features of the first claim. Appropriate configurations are disclosed in the subclaims.

The method according to the invention is described in more detail below using an exemplary embodiment wrote.

A printing press 10 , consisting of a feeder 1 , a plurality of printing units 2 with bo gene-guiding cylinders 4 and a delivery 3 , a drive motor 6 is assigned via a clutch 7 .

A rotary encoder 9 is arranged on one of the arc-guiding cylinders 4 . At the drive motor 6 and the rotary encoder 9 are guided to a machine control 8 .

The machine controller 8 contains an evaluation device 10 for evaluating the signals rotation angle change (torque fluctuations) and characteristic curve formation, a control device 11 and a clock device 12 .

From each mounted printing press 10 , the constantly recurring torque fluctuations are recorded on the angle side by means of the rotary angle sensor 9 , a rotational angle-dependent characteristic curve is formed and this characteristic curve is stored internally in the machine control 8 as a table.

The prerequisite for this is that the torque fluctuations are continuous within 360 ° Single-turn shaft, with a single-turn shaft making one revolution during one working cycle of the Machine or whole number of revolutions.

A clock device, for example a cam switch mechanism, generates cyclic interruption requests to the control device 11 on the basis of the stored table in connection with a real-time control during machine operation and printing operation, which then causes the latter to switch parameters internally.

This makes it possible to initiate the control device before the event occurs, to compensate for the expected load jump indirectly by changing the internal parameters ren.  

REFERENCE NUMBERS

1

investor

2

printing unit

3

display

4

bow-guiding cylinder

5

press

6

drive motor

7

clutch

8th

machine control

9

Rotary encoder

10

evaluation

11

control device

12

clock means

Claims (2)

1. A method for operating a main drive for printing presses which comprises at least one machine control containing a main drive motor, a speed detector and a control device, characterized in that continuously recurring torque fluctuations are recorded in a rotation angle-dependent characteristic curve, the characteristic curve is stored in the machine control and when loading drive the printing press the control device on the basis of the characteristic curve, even before the torque drop occurs, to compensate the expected load jump in directly by changing the parameters. 2. A method of operating a main drive according to claim 1, characterized in that that the torque fluctuations related to 360 ° single-tour shaft or integer of repeated revolutions.