Patent GB-189709434-A (GB)
Title: Improvements in or relating to Copying Lathes.
Inventor: THOMPSON WILLIAM PHILLIPS
Filed: 1897-04-13
Granted: 1898-03-19
Abstract: 9434. Thompson, W. P., [Reed, J. H.]. April 13. Lathes.-Copying-lathes for turning boot and shoe lasts and other irregular objects are constructed to shape the toe and heel or ends as well as the top, sides, and sole or main portion of the object. The feeler or tracing roller 3 and the cutter 5 are mounted in a slide E forced towards the pattern and the work by a weighted cord 15. The slide E is carried by a saddle C movable along ways D on the bed by a screw 7. The pattern and blank are at first supported between centering-arms 32, 30, and 33,37 mounted in heads 26, 39 capable of rotating in the standards 28, 40. The heads 26 are surrounded by cylindrical sleeves 27 to which they can be locked by bolts 49. When the slide E is moved towards the pattern and work, a bar 200 on it depresses one end of a spring lever and through lever mechanism pulls down the bolts 49, leaving the heads 26 free to rotate in the sleeves 27. At the same time the clutch 276 is engaged with the bevel-wheel 21 and the heads 26 are driven from the shaft 20 through the shaft 12, bevel gearing 23, 24, and spur gearing at 25. The clutch 13 is also thrown into engagement automatically with the wheel 10 which drives the screw 7 to traverse the saddle C. When the saddle C arrives at the end of its travel and the top, sides, and sole of the last have been shaped, the bar 200 moves off the spring lever, which then operates to throw the clutch 13 out of action, and allow the bolt 49 to lock the head 26 to the sleeve 27. The upward motion of the bolt 49 through link mechanism throws the clutch 234 into engagement with the wheel 235, and through bevel gearing and a vertical shaft 237 drives a horizontal cam shaft below the table. A cam on this shaft moves the slide E and cutter 5 away from the work, and a spring hook engaging a cross-bar on the carriage C holds them in this position while the carriage is being returned, the clutch 13 being thrown into engagement with the wheel 11 to reverse the rotation of the screw 7. While the head 26 and sleeve 27 are locked together, the pattern and blank are grasped between sets of three radial arms 46, 48 and 43, 45, and the centering-arms 32, 30, and 33, 37 are withdrawn by cam-operated mechanism and rotated to clear the tools 61, 104 and the tracing-devices for shaping the heel and toe. The rod 300 connected with the arm 30 by a ring 263 carries a latch 501 which, when the arm 30 is moved backwards, locks the sleeves 27 and heads 26 together. The bolt 49 is then moved downwards and the sleeves 27 and heads 26 are rotated together with sleeves 39 which are connected to the sleeves 27 by rods 99, 100, 101. The end-shaping cutters and tracers are mounted, as shown in Fig. 7, in brackets which can swing on pivots 109 and are advanced by weighted cords 117 wound on pulleys on the shafts 111 carrying levers 110 connected to the cutter shafts and withdrawn by cams 122 acting through links 119 on the levers 110. The cutters and tracers are rocked on the pivots 109 by a connecting - rod 129 actuated by the arms 128 on the shaft 127 rocked by a cam acting on the arm 126, the levers 110 being jointed at 112 to permit this motion. The heel and toe cutters are then withdrawn and the centering- arms 30,32 and 37, 33 brought back to hold the pattern and receive a new blank. The radial grippers are finally released and the finished last allowed to fall out of the machine.