Stepping motor operated positioning device for a ribbon lifter i

Details Stepping motor operated positioning device for a ribbon lifter i Stepping motor operated positioning device for a ribbon lifter i

1985-10-23

1987-09-15

Burr, Edgar S.

Typewriting machines

Including interposed inking device for record-medium

Including mechanism for shifting ribbon laterally at...

4002161, 400229, B41J 3514

Patent

active

046936190

ABSTRACT:
A positioning device for a printer for driving a ribbon base on which a ribbon cassette is carried by means of a stepping motor to position a ribbon to any of predetermined shift positions. The device includes a stopper for defining a home position of the ribbon cassette, and a power transmitting mechanism for transmitting a power of the stepping motor to the ribbon base. The power transmitting mechanism includes therein a torque limiter which yields a slip therein when a torque lower than a pull-out torque of the stepping motor is applied thereto. Accordingly, when the ribbon cassette is abutted with the stopper, the stepping motor is allowed to continue rotation thereof without stepping out by the torque limiter, thereby preventing an out-of-phase condition of the stepping motor at a stopped position thereof. Consequently, upon subsequent operation, the ribbon cassette can be shifted accurately, and hence color mixture in printing can be eliminated.

REFERENCES:
patent: 4122827 (1978-10-01), Rhodes
patent: 4329072 (1982-05-01), Kacmarcik
F. J. Burchett et al; "Misalignment Correction for Ribbon Lift Mechanism"; IBM Technical Disclosure Bulletin; vol. 26, No. 3A, pp. 1159-1160; Aug. 1983.

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