Cam mechanism

Details Cam mechanism Cam mechanism

1998-01-30

2000-05-30

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359694, 359696, G02B 1514

Patent

active

060697474

ABSTRACT:
A cam mechanism according to the present invention is constructed in such a way that a face cam is secured to a rotary shaft which is rotated by a motor, and a pressing cam, which is movable along the rotary shaft, presses a cam follower pin toward a cam face of the face cam. The press cam has a cam face which faces the cam face of the face cam and has the same cam curve as that of the face cam. Hence, when the motor rotates, the swing pin follows the cam face of the face cam, and the press cam presses the swing pin with a substantially constant force while remains stationary at substantially the same position. Thus, it is possible to reduce a contact friction on the cam face and a load torque which is generated when the motor is driven, and it is also possible to eliminate the unevenness of the torque, which results from the movement of the cam follower which moves up and down on the cam face.

REFERENCES:
patent: 3549250 (1970-12-01), Pantenburg
patent: 4235509 (1980-11-01), Takabayashi
patent: 4868586 (1989-09-01), Norris
patent: 5115348 (1992-05-01), Notagashira
patent: 5196963 (1993-03-01), Sato et al.
patent: 5631776 (1997-05-01), Weigand et al.
patent: 5748391 (1998-05-01), Tanaka et al.

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