Patent GB-1075647-A (GB)
Title: Improvements in or relating to grinding machines for sharpening combs and cutters for shearing machines
IPC: B24B21/00
Filed: 1965-10-29
Abstract: 1,075,647. Grinding. R. G. ARNOLD. Oct. 29, 1965, No. 46004/65. Heading B3D. A grinding machine for sharpening combs and cutters for shearing machines comprises an endless abrasive belt 13 arranged over pulleys 10, 11 with one flight of the belt substantially vertical, and a tool holder 48 pivotally suspended from a stationary part of the machine so that the comb or cutter can be manually moved into and out of contact with the substantially vertical flight of the belt. The pulley 10 is driven by an electric motor 9 mounted on a base 8 of the machine, and the pulley 11 is mounted on a spindle 17, Fig. 3 (not shown), extending from a carriage 18 having horizontally disposed pins 21 engaging vertically disposed grooves in guides 19 secured to a frame 15 upstanding from the base 8. The vertical position of the carriage, and hence the pulley 11, to adjust the tension in the belt is adjusted by a screw 16, Fig. 2 (not shown), which threadedly engages a projection 20 on the frame 15 and has a ball-type connection with the carriage. The pulley 11 is adjustable about the axis of the pins 21 by movement of a screw 25 displacing a member 26 having an inclined surface 30 in contact with one end of a pin 27 which is thereby axially movable to cause its other end to rook the carriage 18 about the pins 21. In another arrangement, Fig. 6 (not shown), the pulley 11 is mounted on a bearing 70 of a circular portion 71 of a square shaft 72 carried by a pivot 75 in a carrier 73 vertically adjustable by means of a screw 78 in an opening 74 in the frame 15, the carriage having grooves 76 engaging the edges of the opening; a ball 81 engages recesses 82 in a nut 80 on the screw to restrain the nut against free rotation, rotation of the nut adjusting the vertical position of the pulley and the tension in the belt. The pulley is angularly adjusted about the pivot 75 by rotation of a screw 85 abutting a ball 87 in the end of the shaft 72. The tool support consists of a channel member 41, Fig. 3 (not shown), which is vertically adjustable along a flange of the frame 15 and is secured in position by a nut 43. The upper end of the member 41 has an L-shaped member 46, one leg 44 of which is formed of two telescopically adjustable parts 44a, 44b which can be secured in adjusted position by a screw 45. The leg 44 is disposed in a vertical plane passing through the middle of the width of the belt and has a hook 47 at its outer end for the conventional comb and cutter carrier 48 whereby an operator can, after adjustment of the length and height of the leg 44 present the comb or cutter to the vertical surface of the belt which is backed by a plate 34. A guard 35 encloses the remainder of the belt. A shearing handpiece or other power tool may be driven from the auxiliary drive comprising a flexible shaft 51 connected to a friction wheel 58 which is mounted on a housing 50 pivotally movable by a lever.operated cam 67, Fig. 4 (not shown), into engagement with the inner periphery of the pulley 10. The housing 50 is mounted on a plate 56 pivotally connected to the base 8 whereby it can be moved to permit access to the pulley during replacement of the belt.