Bar code printing apparatus

Details Bar code printing apparatus Bar code printing apparatus

1989-10-17

1993-12-28

Fuller, Benjamin H.

Recorders

Light or beam recording

Including record receiver or handling means therefor

25023114, 250548, G01D 942, G01D 534, G01N 2186

Patent

active

052743969

ABSTRACT:
A bar code printing apparatus includes a rotary. encoder for outputting encoder pulses in two different phases. The direction in which film is transported is discriminated by the encoder pulses and indicated by a forward direction pulse or a reverse direction pulse indicated for a predetermined length of transported film. A direction discriminating circuit comprises a clock pulse generator for generating clock pulses at a frequency higher than that at which the encoder pulse is output, a delay circuit for slightly delaying the clock pulse, a first latch circuit for latching one of the encoder pulses in synchronism with the clock pulse to output a transportation signal; a second latch circuit for outputting a latch condition signal; and two AND gates, each connected to the first and second latch circuits and the delay circuit, for outputting a forward direction pulse and a reverse direction pulse, respectively.

REFERENCES:
patent: 3517322 (1970-06-01), Lay
patent: 4321531 (1982-03-01), Marshall
patent: 4422176 (1983-12-01), Summers
patent: 4544259 (1985-10-01), Kanaoka et al.
patent: 4548492 (1985-10-01), Kanaoka et al.
patent: 4587496 (1986-05-01), Wolaver
patent: 4892426 (1990-01-01), Steele
59-96966 Jun. 1984 Patent Abstract of Japan.
63-106634 May 1988 Patent Abstract of Japan.

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