Thermal print head printer including a platen

Typewriting machines – Typing by other than type-face or type-die – Thermal

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Details

346 76PH, 400551, 400596, 400630, 400642, 400649, 400708, B41J 320

Patent

active

048446319

ABSTRACT:
The platen (11) is mounted between two side plates (9-10) of equipment which is hinged to two risers (5-6) to rotate about an axis .gamma. running parallel to the axis of the platen. The platen is provided with a freewheel mechanism including an inner ring (28) which is connected to the platen and an outer ring (29) which is provided with a peg (31) engaged in a slot (8) in a fixed member (7). The slot is situated on the opposite side of the platen axis .DELTA. relative to the axis of rotation .gamma. and in substantially the same plane. Detector means (36-37) for detecting the presence of a document in an insertion channel (17) cause the platen to rotate in the direction in which the freewheel mechanism drives the outer ring, thereby pressing the peg against the slot and rocking the equipment about the axis .gamma. thus allowing a document to pass between the print head and the platen until it meets an abutment (14) which is moved into place by the rocking action. When the document is detected as engaging the abutment, the platen is rotated in the opposite, document-driving direction, and return means press the platen against the print head.

REFERENCES:
patent: 4000393 (1976-12-01), Cochran et al.
patent: 4234261 (1980-11-01), Hendrischk et al.
patent: 4422782 (1988-12-01), Lawter et al.
patent: 4439051 (1984-03-01), Lawter
patent: 4448559 (1984-05-01), Matsuda et al.
patent: 4583873 (1986-04-01), Parks et al.
patent: 4687362 (1987-08-01), Runzl
patent: 4725858 (1988-02-01), Bond
patent: 4744687 (1988-05-01), Nukaya et al.
"Auxiliary Two-up Automatic Document Feeder", Smith, Xerox Disclosure Journal, vol. 13, No. 1, Jan./Feb. 1988, pp. 1-3.
"Automatic Sheet Feeder", IBM Technical Disclosure Bulletin, vol. 28, No. 3, Aug. 1985, pp. 1061-1062.

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