Typewriting machines – Including interposed inking device for record-medium – Ribbon-reversing mechanism
Patent
1981-02-26
1985-03-05
Wright, Jr., Ernest T.
Typewriting machines
Including interposed inking device for record-medium
Ribbon-reversing mechanism
400220, B41J 3348, B41J 33514
Patent
active
045028036
ABSTRACT:
The ink ribbon feed mechanism comprises a pair of spool shafts adapted for carrying ribbon spools, a pair of feed pawls selectively engaged with one of the ratchet wheels on said spool shafts for imparting intermittent rotation to the spool shafts, and a reverse mechanism for changing the engaging state of the feed pawls relative to the ratchet wheels. The reverse mechanism includes a first member movable from one to the other direction through a connecting member which is adapted to rotate in unison with the ratchet wheel in dependence upon an operation of a sensor for indicating that reversal of the ribbon take-up direction is required, a second member movable from one to the other position after travel of the first member through a predetermined distance, for changing the engaging state of the feed pawl, and first and second detent members being provided for positioning the members in their two positions. The second movable member is forcibly movable from one to the other position at the same time that the first member is moved from one to the other position by cooperation of the first member and the first detent member, whereby the engaging state of the pair of feed pawls relative to the ratchet wheels may be smoothly changed for reversing the ink ribbon take-up direction.
REFERENCES:
patent: 715456 (1902-12-01), Burk
patent: 796024 (1905-08-01), Wales
patent: 1303159 (1919-05-01), Browning
patent: 1385547 (1921-07-01), Hokanson
Brother Kogyo Kabushiki Kaisha
Wright, Jr. Ernest T.
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