Platen controlled sheetfeed permitting back-up for erasure

Details Platen controlled sheetfeed permitting back-up for erasure Platen controlled sheetfeed permitting back-up for erasure

1988-09-15

1990-07-10

Burr, Edgar S.

Typewriting machines

Sheet or web

For feeding sheet from stack or pack holder

400708, 400551, B41J 1310

Patent

active

049403486

ABSTRACT:
Sensor arm (5) detects paper (1) at the printing stations of a printer (13). The sensor arm is linked through shaft (37) to position ledge (43) where it encounters and extension (47) of spring clutch (31) to decouple the spring clutch. Sheetfeed (11) is both driven and controlled from the platen (3) of the printer. With the spring clutch deactivated by the presence of paper, pawl (39) continues to hold the sheetfeed in an inactive status. In the absence of paper, the sensor arm (5) moves past the printing region, moving the ledge (43) away from contact with the spring clutch. Backward movement of the platen then initiates a sheetfeed cycle by movement of gear (35) being transmitted through the spring clutch (31).

REFERENCES:
patent: 3828912 (1974-08-01), Prade
patent: 4089402 (1978-05-01), Hyland et al.
patent: 4564187 (1986-01-01), Costa et al.
patent: 4583873 (1986-04-01), Parks et al.
patent: 4585224 (1986-04-01), Kuzuya
patent: 4655626 (1987-04-01), Okazaki
patent: 4732501 (1988-03-01), Angst et al.
patent: 4799813 (1989-01-01), Steinmaetz
patent: 4812065 (1989-03-01), Shimagawara et al.
IBM Technical Disclosure Bulletin article entitled "Bidirectional Clutch Spring," vol. 30, No. 4, Sep. 1987 at pp. 1578-1580.

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