Device for slowing down the rotational speed of the sheet transf

Electricity: motive power systems – Braking – Automatic and/or with time-delay means

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101116, 364469, H02P 508

Patent

active

047836164

ABSTRACT:
A processor-controlled device for application to the control board of single-sheet fed silk-screen printing machines is described, of the type having a cylinder with sheet delivery and transfer grippers which is pivotally mounted for bidirectional alternating rotation through an oscillating d.c. motor driven circular sector to the purpose of slowing down the speed of the printing sheet transfer cylinder in the return stroke, comprising a potentiometer with two moving elements and a single driving shaft, one of said moving elements being fed at a pre-established voltage from the motor control board so as to provide the motor speed reference signal, and the other being fed at a voltage of equal value and polarity from a computer so as to obtain an output signal which is the reference signal input to the computer itself, said computer being programmed so as to convert its input signal to an output signal of a polarity which is opposite to that of the motor speed reference signal, said computer output signal being then input to the motor control board with the intermediary of a microswitch operated by a cam fixedly mounted on the cam shaft from which the oscillating circular sector is driven, so that for each value of the computer output signal having a polarity opposite to that of the reference signal for the motor speed, a motor speed reduction proportional to said computer output signal is obtained.

REFERENCES:
patent: 3532953 (1970-10-01), Daab et al.
patent: 3934505 (1976-01-01), Kushner
patent: 4366542 (1982-12-01), Anselrode

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