Reversal preventing device of electric clock

Details Reversal preventing device of electric clock Reversal preventing device of electric clock

1976-05-13

1978-08-08

Witkowski, Stanley J.

Electrical generator or motor structure

Dynamoelectric

Rotary

58125R, 310 37, 310 40MM, 310 49R, 310 83, G04B 1902, G04C 300

Patent

active

041048598

ABSTRACT:
A driving wheel is mounted on the output shaft of a step motor, and a driven wheel engaging with gear wheels on which pointers are set is driven by said driving wheel. The driving wheel and the drive wheel have respective peripheral portions effective to couple the driving wheel with the driven wheel to rotate the driven wheel as the driving wheel rotates of an angular interval of rotation, and for thereafter disengaging the driving member from the driven member.
In order to fix the position of a pointer after the driving wheel has finished rotating the driven wheel, the reversal preventing mechanism acts on the said driven wheel or the driving wheel. The driving wheel is driven by a stepping motor having a rotor which intermittently rotates in one direction through a predetermined angular interval to a rest position. The driven wheel is in turn intermittently rotated by the driving wheel to intermittently change the position of the pointer.

REFERENCES:
patent: 3783608 (1974-01-01), Miyazawa
patent: 3795097 (1974-03-01), Meitinger
patent: 3978654 (1976-09-01), Koike et al.

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