| 摘要 |
1,139,808. Copy - milling. HAYES ENGINEERS (LEEDS) Ltd. 25 April, 1966 [11 May, 1965], No. 19794/65. Heading B3K. A copying control unit comprises a valveoperating element 1 surrounded by a hollow carrier 25 and movable laterally by a stylus 5 to operate fluid flow control valve units 21, an electric motor 31 for rotating the carrier about a constant axis, motor-control switches 32, 33 on the member operable by the element, and means 35 for biasing the element towards one of switches. The element 1 rocks on a spherical mounting 3 and contains an axiallymovable depth control rod 6 operating a valve 8 which may be raised to an inoperative position. (Alternatively, the rod 6 and the valve 8 may be omitted). The flow control valves 21 are operated by a rib 9 on a collar 10 surrounding the element 1. The rib engages pivoted levers 17, the engagement points (and thus the maximum speed of the slide movement controlled by the valves) are adjusted by a knob 15 and a pin 11 adjustable axially of the element. Several variable - speed electric motors 31 may be provided driving a common gear 29 through pinions 30. In operation, when the bias plunger 35 is urging the tracer at an angle of 45 degrees to the tangent of the profile, the switches 32, 33 are not operated. The slides or other parts may also be controlled by solenoid valves controlled by switches 47 operated by a means 48. |
