Ribbon lift mechanism for a typewriter

Details Ribbon lift mechanism for a typewriter Ribbon lift mechanism for a typewriter

1984-10-10

1986-09-23

Burr, Edgar S.

Typewriting machines

Means auxiliary to typewriting function

Means for correcting typing errors

4002401, 400186, 4002161, B41J 1160, B41J 3510

Patent

active

046132481

ABSTRACT:
A typewriter ribbon lifting mechanism includes a holder supporting a printing ribbon and a correction ribbon below the printing ribbon. The holder is vertically tiltable for lifting the printing or correction ribbon selectively from its inoperative position to its operative position. The holder is normally held in its lowered inoperative position. A cam follower is secured to the holder and supports an axially movable follower pin thereon. A ribbon lift cam is rotatable only in one direction to cause the cam follower to tilt the holder vertically. The cam has a first cam groove in which the follower pin is engageable to raise the holder to place the printing ribbon in its operative position, and a second cam groove in which the follower pin is engageable to raise the holder to place the correction ribbon in its operative position. The second cam groove has a portion which forms a part of the first cam groove, while the remaining portion of the second cam groove is greater in depth than the first cam groove. A spring is provided for urging the follower pin into engagement with the bottom of the first or second cam groove. An electromagnet device is provided for effecting the correction of any printing error, and causes the cam follower to raise the follower pin so that the follower pin may be engaged with the second cam groove.

REFERENCES:
patent: 4411542 (1983-10-01), Wenderoth et al.
patent: 4469458 (1984-09-01), Giolitti
patent: 4472073 (1984-09-01), Valle et al.

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