Printing apparatus with step-driven reversible pickup-roller

Details Printing apparatus with step-driven reversible pickup-roller Printing apparatus with step-driven reversible pickup-roller

1998-02-02

1999-09-14

Eickholt, Eugene

Typewriting machines

Sheet or web

For feeding sheet from stack or pack holder

271 1009, 271113, 271114, 271902, 347104, B41J 1158

Patent

active

059511800

ABSTRACT:
When performing printing by the ink jet head 13, the control unit 78 controls the step motor 75 to rotate counterclockwise by the first number of steps corresponding to the paper feeding quantity of one-line and, after the paper feeding of one-line, to rotate clockwise by the second number of steps smaller than the first number of steps to thereby rotate the paper supply roller 70 clockwise through the middle gear 74 and the driven gear 73, during which the back-tension generated in the paper sheet S is removed. Accordingly, a constant paper feeding quantity can be maintained without regard to the back-tension, providing a stable paper feeding accuracy. Since the back-tension has been removed from the paper sheet S whenever characters and the like are printed on the paper sheet S, in combination of the stable paper feeding accuracy, high printing quality can be obtained without the occurrence of white lines in the printed characters.

REFERENCES:
patent: 4990011 (1991-02-01), Underwood
patent: 5035413 (1991-07-01), Yamada et al.
patent: 5725319 (1998-03-01), Saito et al.
patent: 5775688 (1998-07-01), Kato et al.
patent: 5775823 (1998-07-01), Bekki et al.
patent: 5807003 (1998-09-01), Kobayashi et al.
patent: 5846006 (1998-12-01), Hirano
patent: 5846007 (1998-12-01), Narayama

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