Differential checking head

Details Differential checking head Differential checking head

G - Physics

01

B

33/179

G01B 5/20 (2006.01) G01B 7/28 (2006.01)

Patent

CA 1145931

Case 3565 DIFFERENTIAL CHECKING HEAD Abstract of the Disclosure 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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