Printing device

Details Printing device Printing device

1990-09-24

1993-07-20

Burr, Edgar S.

Typewriting machines

Sheet or web

Including aligning of sheet edge prior to typing

400708, 271265, B41J 1326

Patent

active

052287920

ABSTRACT:
Paper feed rollers are in a paper supply path before a printing unit. A paper detector is between the printing unit and the paper feed rollers for sensing the presence of paper in the path. A control of the paper transport is facilitated in the paper supply direction by a movement detector before the paper feed rollers, which is driven by the transported paper and produces a number of pulses proportional to the passage length of the paper. The paper detector comprises a magnet on a rotatable lever and a fixed unipolar Hall element. The movement detector comprises a rotatable wheel having multipole magnets on its periphery and a bipolar Hall element secured to respond to the rotating magnetic poles of the wheel.

REFERENCES:
patent: 3734011 (1973-05-01), Williams
patent: 3949856 (1976-04-01), Ulber et al.
patent: 4548394 (1985-10-01), Koyama et al.
patent: 4892426 (1990-01-01), Steele
patent: 4978973 (1990-12-01), Ogushi et al.
patent: 4979730 (1990-12-01), Holbrook et al.
patent: 5035413 (1991-07-01), Yamada et al.
IBM Technical Disclosure Bulletin, vol. 20, No. 11A, Apr., 1978, pp. 4266-4269.
E. T. Brown et al., "Side-Of-Forms, End-Of-Forms, and Forms Jam-Detection Scheme For Printers", IBM Technical Disclosure Bulletin, vol. 20, No. 11 A, Apr. 1978, pp. 4266-4269.

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