Typewriting machines – For line-spacing by incremental rotation of platen – By electric-power drive
Patent
1984-11-05
1986-03-04
Sewell, Paul T.
Typewriting machines
For line-spacing by incremental rotation of platen
By electric-power drive
400570, 400574, B41J 1992, B41J 1980
Patent
active
045738149
ABSTRACT:
The dot printer, which is of small dimensions, is used with desk top computers or as a peripheral unit with small processors. The printer writes in the serial-parallel mode by means of a thermal head (26) on a paper tape (16) wound on a writing platen (10) which advances intermittently to effect line spacing. This advancing is effected by means of a pawl (56) on a beam (50) controlled by a face cam (46) and a radial cam (48) on a cam cylinder (44) driven by a motor (45). A third cam (42) reciprocates the head (26) and, at the reversals of the head, the face cam (46) allows a spring (45) to engage the pawl (56) with a toothed wheel (62) on the platen (10) and the radial cam (48) then moves the pawl to advance the platen. The head comprises a small plate (29) of insulating material with twenty point-like resistive writing elements, and is fixed to a support (24 ) which is moved parallel to the cylinder by means of the third (42). A printed circuit card (71) fixed to the structure of the printer carries concentric tracks which are traversed by a sliding contact mounted on the cam cylinder (44) to produce synchronizing signals for the printing pulses.
REFERENCES:
patent: 3589494 (1971-06-01), Gloess
patent: 3602355 (1971-08-01), Hesse
patent: 3826915 (1974-07-01), Giolitti et al.
patent: 4218151 (1980-08-01), Kondur
patent: 4500217 (1985-02-01), Swindler
Berruti Pierangelo
Cella Giancarlo
Ing. C. Olivetti & C. S.p.A.
Sewell Paul T.
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