| 摘要 |
1,092,010. Balancing grinding wheels. FARREL CORPORATION. Aug. 25, 1966 [Oct. 13, 1965], No. 38134/66. Heading B3D. [Also in Division F2] A grinding wheel assembly comprises a grinding wheel 16 mounted on a spindle 11, balancing weights in the form of first and second motors 39, 41, means 36, 37 defining annular paths of movement for the motors coaxial with the axis of the spindle, each of the motors having shaft mounted means 42, 43 for driving the motors in the paths, and means for energizing the motors. The spindle is mounted in a housing 10 and driven by a belt from a motor, the housing being reciprocatable on a machine bed. A collar 24 is mounted on a tapered end of the spindle, and a second collar 26, to which the grinding wheel is clamped, is secured by a key 25 to collar 24. The collar 24 is formed with a shoulder 31 on which a ring gear 32 is mounted, the gear being engaged by pinions 42, 43 of the balancing motors 39, 41, motor 39 being carried by a housing 44 secured to a carrier 36 mounted on a bearing assembly 34 on the hub 30 of collar 24, and motor 41 likewise being mounted on a bearing assembly 35 also on the hub 30. The housings 44, 45 of the motors are secured to brackets 62 carrying brush assemblies 58 cooperating with slip rings 54, 55 connected to an electric control circuit. The circuit may include a vibration detector which indicates when the grinding wheel requires balancing. The motors are controlled by the electric circuit which includes push-buttons selectively operable so that the motors move about the axis of the spindle simultaneously in one direction or the other to vary the angular position at which their combined masses act, or so that they move towards or away from each other to vary the magnitude of their combined forces. The motors may be of the stepping or synchronous hysteresis type. Insulated rings 63 are secured on the motors and connected to the circuit to light an indicator lamp when the motors touch one another. |
