Electronic typewriter ribbon lift-up apparatus

Details Electronic typewriter ribbon lift-up apparatus Electronic typewriter ribbon lift-up apparatus

1986-06-18

1989-06-20

Wright, Jr., Ernest T.

Typewriting machines

Means auxiliary to typewriting function

Means for correcting typing errors

400214, 400208, B41J 2936

Patent

active

048405051

ABSTRACT:
A ribbon lift-up apparatus for selectively rotating a ribbon cartridge holder to the printing position or the correcting position uses a disc cam provided with various cam grooves for the printing operation and correcting operation, respectively. The disc cam includes a circular first cam groove for continuous printing operation. The first cam groove has a specified radius with the rotation axis of the disc cam as a center thereof. A second cam groove for single type printing operation is provided and a cam follower pin is positioned initially at a home position in this second cam groove. The second cam groove is in communication with the first cam groove. A third cam groove for a correcting operation is also provided. The follower pin will initially be at the home position of the second cam groove and will cross the first cam groove during the correcting operation. The third cam groove has a smaller radius than the specified radius of the first cam groove. A cam auxiliary plate is rotatably and coaxially provided on the disc cam and comprises a guide portion for the intersection between the first and the third cam grooves and a projection extending at least to the home position to ensure the return of the disc cam to the original position.

REFERENCES:
patent: 4472073 (1984-09-01), Valle et al.
patent: 4573813 (1986-03-01), Aoki et al.
patent: 4589788 (1986-05-01), Lendl
patent: 4601596 (1986-07-01), Musso
patent: 4605324 (1986-08-01), Musso

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