Device for actuating a tilting lever used in sensing sheet-type

Details Device for actuating a tilting lever used in sensing sheet-type Device for actuating a tilting lever used in sensing sheet-type

1990-10-11

1993-01-26

Burr, Edgar S.

Typewriting machines

Means auxiliary to typewriting function

Indicator means

400705, 271265, B41J 2942

Patent

active

051818019

ABSTRACT:
A device for actuating a tilting lever used in sensing sheet-type recording media includes a tilting lever having first and second arms and being swingably mounted about a pivot axis attached to a frame, from a first reference position to a second reference position. A first permanent magnet cooperates with a magnetized contact region on the first tilting-lever arm and is arranged to rest against the magnetized contact region when the first arm is in the first reference position. A second permanent magnet cooperates with a further magnetized contact region on the second arm and is arranged to rest against the further contact region when the second arm is in the second reference position. The respective distances from the first and second permanent magnets to the pivot axis is selected such that unequal torques of sufficiently large magnitude exist between the permanent magnets and their associated arms such that the tilting lever can be displaced from at least one of the reference positions by a slight driving force and abruptly shifted to the other reference position.

REFERENCES:
patent: 4141660 (1979-02-01), Bommersheim et al.
patent: 4296394 (1981-10-01), Ragheb
patent: 4509426 (1985-04-01), Hardin
patent: 4595936 (1986-06-01), Nakajima et al.
patent: 4676675 (1987-06-01), Suzuki et al.
patent: 4881840 (1989-11-01), Rendon et al.

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