Differential checking head

Details Differential checking head Differential checking head

1980-07-07

1981-06-23

Little, Willis

Geometrical instruments

Area integrators

Electrical

33143L, 33149J, 331795D, G01B 520, G01B 728

Patent

active

042742072

ABSTRACT:
A differential checking head for checking tooth-to-tooth spacing of evenly spaced toothed gears or for checking lead variations of helical gears is disclosed. The checking head includes a pair of sensing fingers which have contact portions that touch gear profiles at predetermined test points. One of the sensing fingers is mounted on an arm which is pivoted in a fixed frame and which carries a moveable sensor actuator. The other sensing finger is mounted on a second arm which is also pivoted on the fixed frame and which carries a moveable sensing element which engages the actuator that is secured to the first arm. Both of the sensing arms are returned to their initial positions by return springs; and a second sensor, or limit switch, may be actuated by the actuator that controls the first sensor. The checking head provides a differential reading dependent upon the relative motion of the two sensing arms. This reading occurs at a very slow rate even though both of the fingers may move over the gear being sensed at a fast rate. In this manner, a very slow and accurate minimum reading may be obtained which can be easily read or recorded.

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patent: 3922792 (1975-12-01), Ito
patent: 3950858 (1976-04-01), Donner

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