Typewriting machines – Sheet or web – For feeding plural record media concurrently or selectively
Patent
1983-04-07
1983-11-29
Coven, Edward M.
Typewriting machines
Sheet or web
For feeding plural record media concurrently or selectively
400611, 4006081, 4006082, 400617, 4006163, B41J 1500
Patent
active
044178255
ABSTRACT:
An improved print medium driving mechanism for a line or serial printer adapted for advancing either individual cut sheets or a continuous web having regularly spaced perforations preformed along its edges. The driving mechanism operates in either a friction drive mode or a spur drive mode. In friction drive mode, print medium inserted into the mechanism, is guided to a driven friction feed roller. The medium is then clamped between the feed roller and a plurality of pressure rollers. Driven by the feed roller, the medium is advanced and guided around that roller and then between immediately adjacent surfaces of a printhead and a platen. If cut sheets are being driven, they are inserted between lateral guides adjusted to the width of the sheet. Such sheets, after being advanced past the platen, contact a deflector surface of a cover which guides them into a second clamping, driven engagement in a friction feed assembly. Alternatively, perforated, preformed continuous web printing medium may be mated along its edges to spur drive members. Such printing medium engages the spur drive members both upon entering into and departing from its path around the feed roller. With the continuous web medium thus engaged, the driving mechanism is switched to spur drive mode which releases the print medium from frictional engagement at the feed roller. Further, this mode causes the continuous web to be contacted across its width by a tension bar placing it in tension along its path between the spur drive members and around the feed roller.
REFERENCES:
patent: 2390554 (1945-12-01), Plum
patent: 2881893 (1959-04-01), Metzner
patent: 3421612 (1969-01-01), Pitt
patent: 3919936 (1975-11-01), Barrus et al.
patent: 4227821 (1980-10-01), Plaza et al.
patent: 4229113 (1980-10-01), Anderson et al.
patent: 4234261 (1980-11-01), Hendrischk et al.
Cushman James E.
Plaza Mario G.
Waibel Helmut K.
Coven Edward M.
Durango Systems, Inc.
Schatzel Thomas E.
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