Patent GB-1304059-A (GB)
IPC: B24B3/34
Filed: 1970-12-15
Abstract: 1304059 Grinding VITEBSKOE SPETSIALNOE KONSTRUKTORSKO BJURO ZUBOOBRABATYVAJUSCHIKH SCLIFOVALBYKH I ZATOCHNYKH STANKOV 15 Dec 1970 59583/70 Heading B3D A cutter back grinding machine comprises a table 4 for a cutter 5 to be ground, a stock 2 for a grinding wheel 3 on a carriage 7 movable over guides 9 towards or away from the tool, a reciprocating rod 15 connected by an intermediate link 17 with the carriage, a stop 16 connected to the rod and acted upon by a spring 10, said spring being either compressed or extended by means of a roller 14 secured on the rod and interacting with a cam 13, the cam being connected to a movable element of a power cylinder 11 and means 27 for limiting the travel of the cam to control the thickness of material removed from the cutter. The stock 2 is reciprocable along guides 7 on the carriage 1 by an hydraulic cylinder 8 under the control of a fork 58 acted upon by reversing dogs 47, 48 which are adjustable in unison by gearing 53, 54, 55 and a hand wheel 57. The carriage is urged by the spring 10 along guides 9 towards the cutter 5. The spring is precompressed by the element 12 of the power cylinder moving the cam 13 to a position determined by adjustment of the element 27 by a hand wheel 29, the cam acting on the roller 14 to move the rod 15 which has a screw 22 engaging a gear-nut 21 engaging a gear 19 on a shaft 18 connected to the stop 16. A screw 20 on the gear 19 engages a nut 24 on the intermediate link 17 which is secured to the carriage 1 and has a nut 25 engaging a screw 26 on the gear-nut 21 which also engages a gear 23 connected by gears 33, 34, 35 to a hand wheel 37 for feeding the stock. The element 27 is movable by a hand wheel 29 and is attached to a limit switch 31 which co-operates with a plate 30 on the cam 13 for controlling the circuit of an automatic control system for the machine. The pressure exerted by the grinding wheel on the cutter is adjusted by a hand wheel 38 acting through gears 39, 40, 41 on a screw 42 engaging a nut 43 abutting the spring. In operation, the desired grinding pressure is set by adjusting the nut 43 acting on the spring 16 by rotation of the hand wheel 38. The position of the grinding wheel is adjusted by rotating the hand wheel 37 which, through the gears 35, 34, 33, 23 rotates gear-nut 21 which moves along rod 15 to shift the link 17, and hence the carriage 1 and stock 2, and which also rotates gear 19 to move stop 16 whereby the latter retains its position with respect to the carriage. The length of the movement of the stock on the carriage is determined by adjustment of the dogs 47, 48 and the thickness of the material to be removed is determined by adjustment of the element 27. When a start button is pressed, the cylinders 8, 11 are set in operation. Movement of the element 12 of cylinder 11 moves the cam, the initial movement of which causes a chamfer to act on roller 14 and hence rod 15 to withdraw the grinding wheel a short distance from the cutter whereupon an electric motor 45 connected by a bolt drive 46 to the grinding wheel is energized. Upon further movement of the cam, the rod moves towards the cutter releasing the spring which acts to press the grinding wheel against the cutter to a depth determined by the engagement of the cam with the element; with such engagement, the micro-switch 31 is actuated to send a pulse to a spark-out time relay.