Patent GB-190702056-A (GB)
Title: Improvements in Cutlery Grinding Machines.
Inventor: JOY CHARLES LITTLE
Filed: 1907-01-26
Granted: 1907-09-19
Abstract: 2056. Joy, C. L. Jan 26. Surfacing; sharpening.-In amachine for grinding cutlery, the knife &c. is mounted on a holder secured to a plate pivoted on the ordinary reciprocating carriage. The knife &c. is ground from shoulder to point during the motion of the carriage in one direction only, it being then moved away from the grinder by the rotation of the plate about its pivot, and the carriage moved in the reverse direction at an increased speed. Means are provided for maintaining the carriage at rest while the knife &c. is moved into contact with the grinder by the rotation of the pivoted plate. The plate 30, Fig. 1, carrying the knife-holder support 35, is pivoted at 32 to the carriage 1 and is guided in its movements by a bolt 37 and slot 38. The knife 58 is secured to the holder 33 pivoted to the support 35. Normally, the work is held out of contact with the grinder 39 against an adjustable stop 56 on the carriage by a spring 53. After a blank has been inserted, the operation of the machine is commenced by moving the handle 61, Fig. 1, to drag the rod 59 to the right. This swings the lever 21 about its pivot 62 and moves a rod 63 pivoted to it to the right, compressing a spring 65 and allowing a catch 69 to engage a collar on the rod and hold it to keep the spring 65 compressed. The movement of the lever arm 21a causes a sleeve 20 to slide along the carriage operating - shaft 9, Fig. 3. On this shaft are journaled a large gear 8, continunusly driven by a gear 7 on the sbaft 3 ; gears 16,17 which mesh with planet-pinions 13,14 at the ends of a shaft journaled in the gear 8 ; and a disk 18. The sleeve 20 has a flange 22 carrying pins 23 which project through the disk 18 and gear 16, and which, when the sleeve is moved along the shaft 9, engage clutch-pins 24 on the gear 8. This causes the gears to be locked together, and the shaft 9 is driven directly through the gears 7, 8 and the carriage, driven from the shaft 9 by pinion 11 and rack 12, is given a quick motion in the direction of the arrow d, Fig. 1. This motion continues until the corner of the grinder is opposite the shoulder of the knife ; a trip-pin on the arm 70 on the carriage 1 then releases the catch 69 and allows the spring 65 to push the lever 21 over to the left. This withdraws the pins 23 from the clutch pins 24, and at the same time a pin 72 is projected between stop-pins 19 on the periphery of the disk 18, preventing its rotation. The shaft 9 is now driven by the motion of the planet-pinions 13, 14 about the gears 16, 17, one of which, 16, is fixed The other gear 17, which has one more tooth than the gear 16, is therefore driven in the reverse direction to the gear 8, and at a slow speed. This causes the table to reverse its direction of motion and to move at a slow speed during the grinding operation. A cam 25 is mounted on the hub 17<a> of the gear 17 and engages a bowl 49 at the end of a rod 48, sliding through a box 47 attached to the frame of the machine. The end of this rod 48 carries an adjustable stop which rotates a lever 46 attached to the lower end of a vertical pin 42 journaled in an extension of the carriage 1. An arm 43, carrying a bowl 44, is secured to the upper end of the pin 42, and as this is rotated the arm engages a part 45 of the plate 30, which is then moved about its pivot 32, thus pushing the work into contact with the grinder. The carriage is kept stationary while this is being done by the engagement of a recess 27, in the hub 17<a> of the gear 17, with a pin 29 on a collar 28 fast on the shaft 9. The gear 17 thus runs idly until the pin 29.engages one or other end of the recess 27. The-table is held by a catch 74, Fig. 5, engaging a part of the box 47, and is released by a projection 75 on the rod 48. When the knife has been ground, the arm 46 comes into contact with an adjustable stop 52 and is pushed on one side. The spring 53 then moves the plate 30 about its pivot and removes the work out of contact with the grinder. A new blank can then be put in and the operations repeated.