Patent GB-653882-A (GB)
Title: Improvements in and relating to machines for employment in balancing balance wheels and the like
IPC: G04D7/08
Filed: 1948-09-01
Abstract: 653,882. Balancing rotary bodies. KOHLHAGEN, W. Sept. 1, 1948, No. 23085. [Class 106 (ii)] [Also in Groups XVIII and XXII] Apparatus for poising balances by the method described in Specification 647,202 comprises bearing supports for the wheel staffs where - in the latter may be freely mounted for locating a heavy spot, means for rotating the wheel through a predetermined angle and a drilling device for drilling the wheel at the predetermined angle. Unbalanced wheels run down rimengaging guides 8 with the staffs lying in the plane of the figure and the column of wheels is stopped by a pin 13. When the pin is withdrawn, one wheel drops on to channel-shaped control bars 18 which are pivoted to rotate slightly in their own plane. The bars 18 are then pivoted and the wheel runs down them on to pins at the bottom, bounce being obviated by a gravity ball 34. Bearings 35, 37 then are moved up to engage the staff and are fractionally withdrawn to allow for variations in staff length The wheel is then allowed to settle with its mean heavy spot at the bottom, this action being expedited by vibration if desired. The bearings are then tightened up and a finger 56, 58 is advanced to engage the wheel rim. The bearing 35 and the finger 56 are then rotated to turn the wheel through a predetermined angle. A backing-plate 98 is then moved up to abut one side of the wheel and a drill 108 moves up on the other side to create a light spot. The wheel is then freed to come to rest with the new heavy spot at the bottom whereupon the drill and backing-plate are again advanced to complete the poising. The wheel is then discharged from the machine. Several modifications of the drilling procedure are described. Instead of  drilling to create a light spot, solder may be added at a diameterically-opposed point to effect the poising. The drill may be replaced by a punch. The various operations are controlled by cams mounted on a camshaft 5 or they may be effected by solenoids controlled by a time switch. Left-hand bearing 35. This bearing is mounted on a shaft 37 rotatably carried in a block 38 and rotated through the predetermined angle by a cord secured to a pulley 39 on the shaft 37 and to a pulley 43 turned by a camfollower arrangement operated by a cam on the shaft 5. The bearing is advanced against the action of a spring 51 by a pusher 52 operated by another cam on the shaft 5. The finger 56, 58 is carried on a crank 55 rotating with the shaft 37 and is advanced against the action of a spring 57 by a pusher 60 operated by intermediate levers from the cam-shaft 5. Right-hand bearing 75. This bearing is mounted on a leaf-spring 79 carried on a lever 76, 81 stiffly pivoted at 77. The bearing is advanced by a lever 83 acting on the back of the spring 79 and operated by a rod 89 linked to a cam-follower 87. A spring 90 connects the follower to the lever 83 which thus keeps in contact with the rod 89. Fractional easing of the bearing 75 is effected by the spring 79 and retraction of the bearing 75 is brought about by the lever 83 acting on an adjustable stop 82 carried by the lever 76, 81. Drilling device. The drill 108 is carried by a shaft 107 rotatably mounted in a bushing 93 slidably mounted in a block 94 to which it is connected by a pin 96 which engages a collar 95 on the bushing and the block 94, a spring 97 being interposed. The shaft 107 is clamped in a shaft 105 driven by a pulley 109 and carrying a collar 112 fitted with a thrust bearing 120, a spring 113 which is stronger than the spring 97 being mounted between the collars 112 and 95. A cam follower 115 actuates a push-lever 119 engaging the bearing 120. When the lever 119 operates, the bushing 93 is first moved up to the balance being poised and then the drill moves up within the bushing, the depth of the drilling being limited by the shaft 105 abutting the bushing 93. The backing-plate 98 has a nose 99 and is advanced against the action of a spring 100 by a lever 101 operated by a cam-follower. The drill is retracted by a spring 121. Drillings may be removed by a suction device having a flexible nozzle projecting through the bushing 93, an air vent being provided at the diametrically opposed side of the bushing. The suction device is automatically inoperative when the drill is inactive.