Other

Caesar D Tremaglio

Alfred Smith

Lawrence E Rode

Angelo F Tremaglio

Neil L Tremaglio

The present invention provides a rapid indexing spindle drive and control apparatus for installation as a retrofit on a cam controlled automatic screw machine to provide the capabilities of variable spindle speed and direction as well as rapid indexing of the spindle in relation to the tool head of the screw machine for stationary tool operations. The apparatus includes a variable speed, low mass servo-motor mounted on the headstock of the machine and connected to the spindle by a 1:1 drive ratio timing belt and pulley system. A cam shaft revolution sensor is mounted adjacent to the screw machine cam shaft and is driven by the cam shaft through a second 1:1 drive ratio timing belt and pulley system. Electronically connected to the servo-motor and the cam shaft revolution sensor is a computer control system which includes a computer and an operator interface unit whereby cam shaft positions and spindle drive commands corresponding to specific cam shaft positions are entered by the machine operator. In operation, the computer receives signals constantly generated by the cam shaft revolution sensor and a resolver in the servo-motor which signals correspond to the rotational positions of the cam shaft and the servo-motor respectively. These signals are compared to the values entered from the operator interface unit and the appropriate spindle commands are issued by the computer at the same points for each revolution of the cam shaft.

Rapid indexing spindle drive attachment for CAM controlled automatic

A spindle brake apparatus for add on attachment to automatic Swiss screw machines, comprising an idler pulley release assembly, a spindle brake assembly and a cam actuated control assembly employing the existing cam shaft timing and control means of such machines to stop spindle rotation so that cross milling operations may be performed. The apparatus is operated by compressed air in response to cam actuated valves to first release an idler pulley then apply the brake to stop spindle rotation. After a stationary operation is performed, compressed air is released thereby releasing the brake followed by reengagement of the idler pulley to reestablish spindle rotation.

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Waterbury, CT, United States of America

Caesar D Tremaglio