Typewriting machines – Control of print position along print-line by signal...
Patent
1988-02-10
1989-02-21
Eickholt, E. N.
Typewriting machines
Control of print position along print-line by signal...
101 9315, 346139C, 346139D, 250231SE, 250237G, B41J 2116
Patent
active
048060348
ABSTRACT:
A system for precisely positioning a printing element relative to a rotating drum, as in a drum printer, employs two position signals for alignment purposes. A pair of linear grids is disposed along a path of travel of the printing element for generating, with the aid of optical beam and sensor devices, a periodic electric signal which varies in accordance with printing element position. One of the grids is stationary and the second of the grids moves with a carriage supporting the printing element. An encoder positioned alongside the drum is operative with a set of markings having a variation in spatial frequency, or a grid overlay, to produce an alternating electric signal which varies in accordance with rotational position of the drum. Motors which rotate the drum as well as a lead screw which translates the printing element may be constructed as synchronous motors to permit phase locking to each other. Circuitry responsive to periodic signals outputtd by the linear grids and the encoder introduce phase shift between motor drive signals to align position of the printing element with position of the drum independently of any backlash which may be present between the lead screw and the carriage driven by the lead screw.
REFERENCES:
patent: 3153111 (1964-10-01), Barber et al.
patent: 3833807 (1974-09-01), Takeda
patent: 3970781 (1976-07-01), Dalton et al.
patent: 4028732 (1977-06-01), Salter et al.
patent: 4051367 (1977-09-01), Sayce et al.
patent: 4078173 (1978-03-01), Fultz
patent: 4247214 (1981-01-01), Swan, Jr.
patent: 4254439 (1981-03-01), Fowler
patent: 4371254 (1983-02-01), Beery
patent: 4475831 (1984-10-01), Drejza
patent: 4660086 (1987-04-01), Lemelson
patent: 4700065 (1987-10-01), Kordulla et al.
patent: 4716292 (1987-12-01), Rieder et al.
patent: 4717824 (1988-01-01), Sakamoto et al.
patent: 4751383 (1988-06-01), Veyama
patent: 4757196 (1988-07-01), Yamada et al.
Caufield Francis J.
Eickholt E. N.
Polaroid Corporation
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