Patent GB-190917461-A (GB)
Title: Improvements in or relating to Machines for Buffing or Polishing Metallic Articles.
Inventor: LAKE WILLIAM EDWARD
IPC: B24B29/00
Filed: 1909-07-27
Granted: 1910-07-27
Abstract: 17,461. Lake, W. E., [Gail, J. F.]. July 27. Disk and wheel apparatus.-A machine for buffing bedstead mounts &c. comprises a buffing-wheel, a rotary work-support which can be moved so as to shift the work into and out of the field of operation of the wheel, a rotary cam-member controlling the actuation of the work-support, and governing-means to interrupt the movement of the cam member for a predetermined period of time, during which the mount is acted upon by the buffing-wheel, after which it is retracted under spring action. Means are provided to vary the period of operation and for automatically supplying abrading-material as desired to the buffing-wheel when in operation. Fig. 1 shows, in elevation, part of a machine having two buffing-wheels and two work supports. A table 35 carried by guide 31, and movable towards and away from the wheel, carries head and tail stocks 40, 47 for holding the mount 84, the stock 40 is pivotally carried at 38, and may be tilted up to allow the mount to be placed on it; it is then released, and the mount assumes the position shown, in which it may be also engaged by the continually rotating chuck 47, urged forward under the action of a lever 93 actuated by a cam mounted on a sleeve on the shaft 70. The chuck 47 receives its rotary motion through a train of spur and chain gearing carried by a system of jointed links to allow the movement of the carrier. The reciprocation of the workcarriage is produced by a cam 101 on the driven shaft 70 actuating a bell-crank lever 103 to push forward the carriage by means of one of its arms 105. The cam 101 and other operating-cams are normally loose on the shaft 70, but, to start the machine, are coupled to the shaft by a clutch operated by a pedal ; the rotation of the cam sleeve then continues for approximately three-quarters of a revolution whereupon the sliding clutch block comes into contact with the cam 126, Fig. 4, on the bell-crank lever 122 and uncouples the cam-sleeve from the shaft. The mount then rotates in contact with the wheel, and the cam 145 on the cam-sleeve allows the arm 144 to fall into the line of action of a cam 146 on the shaft 70, which, on each rotation, rocks a member to step round a ratchet disk 134 carrying a cam 135. This cam eventually actuates a bell-crank lever 123 to release the cam 126 from the clutch block, and couple the camsleeve and shaft for another quarter-revolution. The cam 145 on the cam-sleeve releases the ratchet disk from its pawls and allows it to rotate backwards under spring action until it reaches a stop, which may be adjusted to determine the extent to which the ratchet disk has to be stepped round and the time the wheel acts on the mount. During the last quarter-revolution, the cams allow the work-carriage to recede from the buffing-wheel, and the rotating chuck is automatically released from the mount. The means for supplying abrading-material is also mounted on a carriage sliding on the guides 31. A cam on the shaft 70 continuously reciprocates the rod 175, Fig. 16, and steps round the ratchet-wheel 197 by means of the pawl 181 on the bell-crank arm 173, and, at each oscillation of the bell-cank, pulls down a chain 190 and rotates a screw 160 to advance a carriage 150 and bring the abradant material into contact with the buffing-wheel. During each travel of the carriage, the screw-threaded shaft 153 is turned slightly by gears 155, 157, and projects the abradant block slightly forward in its carriage to compensate for the wear of the wheel. In order that abradant may be supplied only once in two or more revolutions of the shaft 70, a controlling-disk on the same axle with the ratchet-wheel pushes an arm 206 outwards during some of the movements of the ratchet and disengages the piece 172 from the hooked end of the bell-crank arm, thus leaving the screw 160 unoperated by the stepping-round of the disk. When the work-carriage moves away from the buffing-wheel, it moves the rod 204 to bring the higher portions of the disk 203 under pawls 181, 208, and allows the ratchet disk to swing back under spring action to its original position, at the same time rendering oscillations of the arm 175 inoperative on the abradant carriage.