Print hammer position control device

Details Print hammer position control device Print hammer position control device

1992-06-18

1993-07-27

Wiecking, David A.

Printing

Selective or progressive

Bed and platen machines

4001573, 4003912, B41J 938

Patent

active

052302830

ABSTRACT:
A print hammer is moved toward a printwheel and impinges thereon to thus make a character impression on a sheet of paper supported on a platen. The print hammer is moved in accordance with rotations of a cam which in turn is rotated by a motor. An encoder disk formed with a plurality of slits in the outer circumference thereof is attached to the drive shaft of a motor. A photocoupler including an LED and a photosensor is provided in association with the encoder disk to detect the rotational speed of the motor. The speed and position control of the print hammer are carried out based on output pulses from the photosensor. Before the print hammer reaches a pre-impact position, only up-going pulses are used for the control. After passing the pre-impact position and until reaching a post-impact position, the speed and position control of the print hammer are carried out based on both the up-going and down-going pulses.

REFERENCES:
patent: 3850098 (1974-11-01), Morohashi
patent: 3929067 (1975-12-01), Nishikawa

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