Patent GB-1019137-A (GB)
Title: Device for static balancing by co-ordinates of grinding wheels on a grinding machine
IPC: B24B41/04
Filed: 1963-09-11
Abstract: 1,019,137. Balancing grinding wheels. FORTUNA - WERKE SPEZIALMASCHINENFABRIK A.G. Sept. 11, 1963 [Nov. 13, 1962], No. 35818/63. Heading B3D. A device for balancing a grinding wheel 7 on a grinding machine comprises a control shaft 15, Fig. 2 (not shown), and a control tube 16 therearound in the hollow spindle 1 of the grinding wheel, the shaft and tube being connected to a balancing part 13 and an adjustment part 19 having two optionally engageable clutches 91, 93, Figs. 5 and 6 (not shown), connected by an intermediate drive to a common control motor, whereby engagement of one clutch effects uniform rotation of the shaft and tube in the same direction for altering vector direction of the balancing part, and engagement of the other clutch effects uniform rotation of the shaft and tube in opposite directions for altering the vector magnitude of the balancing part. The grinding wheel is secured by a nut 6 to a flanged part 5 which is secured to a tapered portion 4 of the spindle 1 and receives a flanged nut 8 having a chamber 12 for the balancing part 13. The barrel or polygonal-shaped end 27 of a lever 20 is received in a central recess 28 of the part 13, the lever having a surface 29 which is machined at an angle 30 to its longitudinal axis and engages a surface 23 inclined at an angle 22 to the longitudinal axis of a part 21 secured to the end of the control shaft 15; a nut 36 having a conical seating 35 engages a spherical surface 34 on the lever 20 to maintain the surfaces 23, 29 in engagement. The part 21 is disposed within a member 24 which is secured to the control tube 16 and has recesses 32 engaged by dogs 31 extending from the lever. When the control shaft and tube are moved through equal angles in opposite directions to cause movement of the surfaces 23, 29 relative to each other, the balancing part 13 moves radially of the spindle to alter its vector magnitude. When the shaft and tube are moved through equal angles in the same direction, the balancing part moves circumferentially of the spindle to alter its vector position. The control shaft 15 connected to a sun-wheel 73 of the adjustment device 19, the sun-wheel engaging planet gears 74 meshing with an outer gear 72 formed on its outer surface as a worm-wheel 81 engaged by a worm-shaft 79. The control tube 16 is likewise connected to a sun-wheel 69 engaging planet wheels 70 meshing with an outer wheel 68 also formed on its outer surface as a worm-wheel 80 engaged by a worm-shaft 78. The hollow spindle 1 is connected to a sunwheel 66 engaging planet wheels 67 meshing with an outer wheel 65 secured by screws 64 to the head 61 of the machine. The worm-shaft 79 carries two clutches 91, 93 which, when energized, connect the shaft to gears 84, 86, gear 84 meshing with a gear 83 on worm-shaft 78, and gear 86 being connected by an intermediate gear 87 to a gear 85 on the worm-shaft 78. The shaft 79 also carries a worm-wheel 95 engaged by a worm 96 on a motor 97. With the motor inoperative and both clutches disengaged, the worm-shafts are locked against movement to prevent movement of the control shaft 75 and control tube 16. De-energization of clutch 91 and operation of motor 97 in one direction or the other causes the worm-shafts 78, 79 to rotate in the same direction and thus the control tube and shaft to rotate in the same direction to alter the vector direction of the balancing part 13. Alternatively, de-energization of clutch 93 and operation of motor 97 in one direction or the other causes the wormshafts to rotate in opposite directions and thus the control shaft and tube to rotate in opposite directions to alter the vector magnitude of the balancing part. In an alternative embodiment, the balancing part 14, Fig. 3 (not shown), has an eccentric recess engaged by an eccentric 40 on a shaft 42 connected by a coupling 44, 45 to the control shaft 17. The balancing part 14 also has a pin 50 engaging a radial slot 49 in a flanged member 48 connected by a coupling 46 to the control tube 18. Rotation of the tube and shaft through the same angle in opposite directions alters the vector magnitude of the balancing part 14 whereas rotation of the shaft and tube through the same angle in the same direction alters the vector direction of the balancing part.