Bidirectional printing device

Details Bidirectional printing device Bidirectional printing device

1989-05-04

1990-08-14

Wiecking, David A.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

400279, 400322, B41J 1930

Patent

active

049482793

ABSTRACT:
A printer mounted on an electronic cash register (ECR) performs printing on printing paper by moving a print head left to right and right to left, i.e. bidirectionally. The printer uses right and left reset signals to determine the print start position and printing direction of the print head, the right and left reset signals being fed alternately and regularly to the driving circuit for the print head for performing bidirectional printing, thereby assuring correct bidirectional printing. The right and left reset signals are constantly monitored. If the reset signals of the same kinds are successively detected, it is judged that trouble has occurred, hampering correct bidirectional printing, and notice is issued accordingly.

REFERENCES:
patent: 4179223 (1979-12-01), Kwan
patent: 4840281 (1989-02-01), Yamakawa

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