Position sensor systems for a print head

Details Position sensor systems for a print head Position sensor systems for a print head

1989-09-15

1991-05-28

Crowder, Clifford D.

Printing

Rolling contact machines

Rotary

101235, B41F 3300

Patent

active

050184431

ABSTRACT:
A position sensor system for controlling accurately the movement of a print head so that printing occurs on a series of products at the same location independent of product speed, changes in speed and mechanical delays includes a product or product mark sensor, a speed sensor, an integrator, and a comparator. The product mark sensor detects the presence of a product mark on each product to be printed upon to generate sensed signals. The speed sensor detects the speed of the product to be printed upon to generate a speed signal. The integrator is responsive to the speed signal and the sensed signals for generating a ramp signal indicative of the actual position of the product to be printed upon. The comparator compares the ramp signal with a reference signal compensating for mechanical delays and generates a clutch-on signal to activate a print head clutch to cause movement of the print head into a printing position.

REFERENCES:
patent: 3394651 (1968-07-01), Ochs
patent: 3611920 (1971-10-01), Timko et al.
patent: 4220084 (1980-09-01), MacLean et al.
patent: 4334471 (1982-06-01), Noyes et al.

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