Typewriting machines – Carriage or carriage-moving or movement-regulating mechanism – Carriage-feed mechanism
Patent
1988-01-28
1989-06-13
Sewell, Paul T.
Typewriting machines
Carriage or carriage-moving or movement-regulating mechanism
Carriage-feed mechanism
250237G, 4007051, B41J 1930, B41J 2920
Patent
active
048387177
ABSTRACT:
A serial dot matrix printer is provided with a slit encoder and an optical sensor opposed to the slit encoder. In the slit encoder, firing signal slits each having a fixed width are provided at a fixed pitch, and block signal slits each having a width smaller than that of each firing signal slit are provided in every block composed of a plurality of the firing signal slits. As a carriage moves, the optical sensor moves along the slit encoder to produce a signal at every slit. The signal from the optical sensor is applied to a first control device having a block detector and a firing timing unit. The block detector receives the signal from the optical sensor, measures the passing time between every slit, and detects a block signal according to a difference in passing time between the slits. The firing timing unit produces firing timing signals obtained by equally dividing the passing time of each of the firing signal slits by a predetermined number whenever the passing time of the each firing signal slit is measured. There is further provided a second control device having a carriage controller for controlling a carriage moving motor according to the block signal.
REFERENCES:
patent: 4119383 (1978-10-01), Watanabe
patent: 4180704 (1979-12-01), Pettit
patent: 4247214 (1981-01-01), Swan
patent: 4507647 (1985-03-01), Minami
patent: 4602242 (1986-07-01), Kimura
patent: 4654527 (1987-03-01), Schmitt
patent: 4667099 (1987-05-01), Arai
IBM Tech. Disc. Bulletin, by K. H. Burkardt, vol. 23, No. 11, Apr. 1981, p. 4984.
Chinon Kabushiki Kaisha
Sewell Paul T.
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