Open/close mechanism of upper frame for use in image forming app

Details Open/close mechanism of upper frame for use in image forming app Open/close mechanism of upper frame for use in image forming app

1997-11-10

1999-01-12

Brase, Sandra

Electrophotography

Having particular structure

Modular or displaceable

G03G 1500, G03G 2116

Patent

active

058600442

ABSTRACT:
This invention relates to an image forming apparatus constructed such that an upper frame is openably mounted on a main base frame and a pivotal movement transmitter (gear) is rotatably mounted on the upper frame about an axis of a rotation of the upper frame, i.e., in association with the rotation of the upper frame. The gear has a cam portion. One end of a lever comes into contact with part of the cam portion of the gear, while the opposite end of the lever comes into contact with a coil spring. Further, a distance from the pivotal axis of the gear to the contact position of the lever with the cam portion decreases in accordance with a proceeding of the closing operation. Accordingly, as the lever (cam follower) follows the cam portion in accordance with the closing operation of the upper frame, a compression force to compress the coil spring increases. Thereby, a brake force applied to the upper frame on the way of closing also increases.

REFERENCES:
patent: 4386841 (1983-06-01), Wakao et al.
patent: 4589758 (1986-05-01), Kasama et al.
patent: 4641947 (1987-02-01), Ishida et al.
patent: 5041871 (1991-08-01), Hata
patent: 5206681 (1993-04-01), Otomo et al.
patent: 5379092 (1995-01-01), Takashima

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