Carriage position control circuit for a serial printer

Details Carriage position control circuit for a serial printer Carriage position control circuit for a serial printer

1993-06-16

1994-04-05

Wiecking, David A.

Typewriting machines

Control of print position along print-line by signal...

400708, 4007051, B41J 2116

Patent

active

052998738

ABSTRACT:
A carriage position control circuit which locates a carriage at a center position of a printing sheet regardless of the paper size to maintain the printing sheet in contact with the platen. The carriage position control circuit includes a sensor (30) which moves, together with the carriage (2), in parallel to a center axis of the platen (1) of a serial printer and senses a printing sheet (10), a sheet position detector (43) which detects left and right edge positions of the printing sheet based on the sensor output and a center position calculating circuit (45) which calculates the center position of the printing sheet based on the left and right edge positions. The detection of the left and right edge positions and the calculation of the center position are performed before the leading edge of the printing sheet reach the anti-floating device (3). The line feed controller (46) controls a line feed and a carriage moving controller (47) controls the movement of the carriage according to the center position data calculated by the center position calculating circuit (45). Therefore, the carriage can be reliably moved to the center position of the printing sheet even if the width of the printing sheet is very narrow compared with the length of the platen.

REFERENCES:
patent: 4061595 (1986-07-01), Aiba et al.
patent: 4265556 (1981-05-01), Krieg et al.
patent: 4272204 (1981-06-01), Quinn, Jr. et al.
patent: 4781478 (1988-11-01), Eguchi
patent: 5127752 (1992-07-01), Courtney

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