Typewriting machines – Including interposed inking device for record-medium – Ribbon-reversing mechanism
Patent
1980-11-05
1983-04-26
Heinz, A. J.
Typewriting machines
Including interposed inking device for record-medium
Ribbon-reversing mechanism
4002361, B41J 3348, B41J 3340
Patent
active
043811558
ABSTRACT:
The present invention is an improved inked ribbon advance and reverse mechanism for use in a multiple print station printing apparatus. The improved inked ribbon advance and reverse mechanism includes a first ribbon spool and a second ribbon spool onto and from which an inked ribbon is wound and unwound, respectively. The improved inked ribbon advance and reverse mechanism also includes a first ratchet wheel and a second ratchet wheel which are axially aligned and fixedly coupled to the first ribbon spool and the second ribbon spool, respectively, so that they rotate together. The second ratchet wheel is disposed in a vertical plane which is parallel with the axis of the rotative drive shaft of the printing apparatus and substantially orthogonal to the plane in which the first ratchet wheel is disposed, and is adjacent, but not contiguous, to the first ratchet wheel. The improved inked ribbon advance and reverse mechanism further includes a pawl which has a first tooth and a second tooth, which engage one of the teeth of the first ratchet wheel and the second ratchet wheel, respectively, a sliding member which has a first flange and a second flange, which is fixedly coupled to the pawl, and which is slidably coupled to the frame of the printing apparatus and a lever arm which is pivotally and resiliently coupled to a mounting member, which is fixedly coupled to the movable carrier of the printing apparatus. One of the ends of the lever arm contacts either the first flange or the second flange of the sliding member.
REFERENCES:
patent: 3145651 (1964-08-01), Schultz
patent: 3986594 (1976-10-01), Kondur
patent: 3997046 (1976-12-01), Wolowitz
patent: 4214838 (1980-07-01), Gassowski
IBM Technical Disclosure Bulletin; vol. 21, #8; Jan. 1979; Pivot'g Head Multi-Station Printer, A. C. Thorpe.
C. Itoh Electronics, Inc.
Heinz A. J.
Johansen W. Edward
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