| 摘要 |
1,107,993. Template following systems. PRECISION CONTOURS, Inc. June 11, 1965, No. 24756/65. Heading G3N. [Also in Division B3] A milling machine, Fig. 1, has a fixed head 13 carrying a milling cutter 14 taking tangential cuts on a workpiece 10 supported between a tailstock 16 and an indexable head 15 angularly positioned by an index head 18. The index head and tailstock are supported on a table 17 movable transversely by a mi rometer input feed 20, and vertically by a micrometer input feed 21 and longitudinally either manually or by an automatic feed mechanism. A template 24 is fixed to the front edge of the table and sensed by a switch actuating follower 23 determining the rotation of the feed 20 through a control unit 22, incorporating a motor, directly mounted on the feed 20. A dial gauge 160 indicates the residual error in the operation of the follower 23. In a modification, Fig. 4, not shown, for end-milling, the template 23 is mounted vertically and the control unit 22 is directly mounted on the feed 21. The template following system, Fig. 2, comprises the follower 23, maintained in engagement with the template by a compression spring 81, positioning a switch arm 77 between contacts 40, 37 to control the direction of rotation of a motor 19 driving the appropriate feed unit 20, 21. A switch 76 inverts the direction of feed in response to the position of switch arm 77 by determining the energization of reversing relays 62, 63 in a supply to a field winding 61 and an armature winding 60 of the motor 19. The speed of the motor is determined by a rheostat 125 and the drive from the armature 60 to the feed unit is effected through an electromagnetic clutch 107 energized through a switch 28. The opening of a switch 35 de-energizes a relay 98 to isolate the switch arm 77 to permit control of the relays 62, 63 by a change-over switch 30. |
