Automatic paper bail actuator

Details Automatic paper bail actuator Automatic paper bail actuator

1990-05-08

1991-09-10

Burr, Edgar S.

Typewriting machines

Sheet or web

Including friction-feed means

4006392, 400636, 400649, B41J 1320

Patent

active

050468731

ABSTRACT:
An automatic paper bail actuator for a printer having a rotating platen or equivalent means for feeding a printing support including a helicoidal spring wound on the platen shaft and having two end arms, a first arm being elongated to interfere with the bail and a first reference stop, the spring coil being clamped on the shaft by interference with the bail and opening the bail when the shaft rotates in the direction opposite to the one providing normal forward feeding of a printing support, closing the bail when the shaft rotates in the direction providing normal forward feeding until the first arm interferes with the first reference stop and releases the spring coils; the second arm interfering with a second reference stop for a rotation of the shaft in the direction opposite to the normal one and releasing the spring coils for a predetermined angular position of the spring and the first arm, hence for a predetermined open position of the bail. Additional structure providing hysteresis between the open and closed positions of the bail are also disclosed.

REFERENCES:
patent: 2616546 (1952-11-01), Maddox
patent: 4197024 (1980-04-01), Huntoon
patent: 4561792 (1985-12-01), Behrens et al.
patent: 4602883 (1986-07-01), Ozawa et al.
patent: 4630950 (1986-12-01), Chu et al.
patent: 4708504 (1987-11-01), Asakura
patent: 4799814 (1989-01-01), Okubo et al.
patent: 4883375 (1989-11-01), Karube et al.
IBM Tech. Disc. Bulletin, vol. 30, No. 4, 9/87, Platen-Driven Paper Bail Closer.

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