Patent GB-125074-A (GB)
Title: Improvements in or relating to Polishing Machines.
IPC: B24B23/08
Filed: 1919-03-31
Abstract: 125,074. National Carbon Co., (Assignees of Casella, S. L.). March 29, 1918, [Convention date]. Wheel apparatus. - Relates to a machine for cleaning or polishing the contact - making ends of the cells of dry batteries, namely, the brass cap on the carbon electrode and the outside of the bottom end of the zinc cup, and comprises an endless conveyer - chain, by which the cells are carried, adapted to move these past grinding-wheels located on one side of the conveyer, whereby the caps are ground, and then to remain stationary for a period during which the bottoms of the cells are polished by rotating polishing - brushes located on the opposite side of the conveyer. The endless conveyer-chain passes over sprocket-wheels at the ends of the machine, and each alternate link carries a forked carrier-bracket 12 adapted to receive the cells 13. The conveyer has imparted thereto a step-by-step travelling movement by means of ratchet-mechanism adapted intermittingly to rotate one of the sprocket-wheels. During the forward motion of the conveyer and the cells, the brass caps 16 are carried past four slightly conical grinding-wheels 20, each cap thereby receiving four successive grindings of short duration. When the conveyer stops, the brass caps are located out of contact with the grinding- wheels, and the bottom ends 14 of the cells are located opposite the wire polishing-brushes 21; by thus-stopping the cells during polishing, no burrs are left on the projecting bottom edge of the cylindrical case 13 of the cell. Each forward movement of the conveyer moves the cells a distance equal to that occupied by ten cells, and there are ten polishing-brushes so spaced that the bottom face of every cell is polished once. During the grinding of the caps 16, the cells are pressed towards the grinding-wheels by rollers 36 mounted on spring-pressed bell-cranks 37; rear-guards 39 are provided between the rollers, and guards 40, insulated from the frame to prevent short-circuiting of the cells, are provided for the front ends of the cells. During the polishing of the bottoms of the cells, these are pressed towards the brushes by springs 48, 49 having insulated plates at their free ends adapted to engage the caps 16 and secured at their other ends to a presser-bar 50. This bar is mounted on levers 51 secured to a rock-shaft 52, adapted to be rocked, to move the springs forwards, by a rotating cam, and to be retracted, during the travelling movement of the conveyer, by a spring 57. To hold the cells down in the brackets 12 during the grinding and polishing operations, springs 61 are provided carried by a stationary bar 62 and adapted to press on the cells. Rear guides 72 are provided between the polishing-brushes, and front guides 73 also are provided. The grinding and polishing wheels are adjustably mounted on the frame 10 by means of rods 63 carrying at their outer ends the bearing- brackets 33, 43, 45 of the various wheels and mounted to allow of vertical and lateral adjustment by means of eccentric sleeves 65 fitting on the rods and rotatable in members 64 secured to the frame. The finished cells are delivered down an inclined shoot.