Patent GB-756360-A (GB)
Title: Improvements in or relating to power brushing machines
IPC: B23F19/10
Filed: 1953-08-19
Abstract: 756,360. Power brushing gears. ELGRO MACHINE TOOL CO., Ltd., and GROSZ, E. Nov. 16, 1954 [Aug. 19, 1953; Oct. 26, 1953], Nos. 22905/53 and 29578/53. Class 60 A power brushing machine for removing burrs and the like from spur gears comprises a base 10 carrying a column 11 in which is mounted a holder 12 for the gear; around the holder are arranged four rotary wire brushes 13 individually driven by electric motors 14. A sleeve 20 is rotatable within the column 11 and extends upwardly beyond the top end of the column. The lower end of the sleeve 20 is secured to a bush 21 keyed to a gear 23 meshing with a pinion 24 driven through a reduction gear by an electric motor in the machine base 10. On the upper end of the sleeve 20 is secured an annular member 28 to which is secured a plate 29; a sleeve 33 is rotatable in a bush 32 in the plate 29 and fits around a hollow shaft 34 to which it is keyed. The shaft 34 and sleeve 33 are eccentric with respect to the sleeve 20. The sleeve 33 carries an externally toothed gear 37. On a top member 38 welded to the column 11 is mounted a gear ring 39 having internal teeth, the gear ring axis approximately coinciding with the axis of the column 11. The gear 37 and the gear ring 39 are so dimensioned that the gear teeth are clear of one another except, at any one instant, in one region where they mesh. Since the gear 37 is freely rotatable in the bearing 32 which is moved in a circle around the axis of the gear ring 39, the point of contact between the two gears. can be moved around their periphery. Rotation of the sleeve 20 thus drives the inner gear 37 so that its point of contact with the outer gear ring 39 gradually moves. around the outer gear. The gear 37 has a number of teeth equal to that of the gear to be brushed whilst the gear ring 39 has one more or one less than this number of teeth; thus, as the gear 37 makes one traverse around the periphery of the gear ring 39 it is advanced or retarded about its own axis by one tooth. Slidably mounted' inside shaft 34 is a shaft 41, the two shafts being connected by driving pins 42, 43 so that they rotate together, but are free for relative axial movement. Pin 42 is secured in the shaft 41 and is slidable in a slot 44 in shaft 34. Pin 43 is secured in the shaft 34 and is slidable in a slot 45 in shaft 41; pin 43 extends into an annular member 50 carried on the shaft 34, member 50 carrying :a spring 51 which presses against a member 52 in which are secured the outer ends - of the pin 42, so that the spring 51 urges the inner shaft 41 upwardly with respect to the outer shaft 34. On the shaft 34 is mounted a holder 46 for the gear 47 to be brushed, the gear being retained on the holder by radially extending plungers 148 retained by a spring clip 48 which lies in a circumferential groove 49 around the holder; the plungers 148 are pressed outwardly against the inner surface of the bore in the gear 47 by upward movement of the tapered end of the shaft 41. The lower end of the hollow shaft 34 is rotatably supported in a bearing 40 on a member 19, the bearing being eccentric of the axis of the column 11; the member 19 is secured to the top end of a shaft 16 axially slidable in, but keyed to, the bush 21 at the lower end of the sleeve 20. The shaft 16 is carried on a hydraulic piston in the machine base to permit axial adjustment of the holder 46; to release the gear, shaft 16 is raised until collar 52 contacts the plate 29. Each brush drive motor 14 drives through coupling 60, shaft 61, coupling 62 and bevel gears 64, 65, a hollow shaft 66 carried by bearings 67, 68 in a casing 69. The hollow shaft 66 is internally splined at one end to engage with grooves on a spindle 71 slidable in the shaft 66. Secured to the outer end of the spindle 71 is a bush member 72 rotatable in bearings 73, 74 carried in a non-rotatable hollow shaft 75 axially slidable in the casing 69 and locked in desired axial position by screw 76. The brush is mounted on the end 77 of the spindle 71. The casing 69 and motor 14 are secured to a column 80 carried in a mounting 81 carried on a support 82 on the central column 11. The columns 80 are adjustable longitudinally in their mountings and also angularly, clamping bolts being provided for securing them in adjusted positon.