Patent GB-239533-A (GB)
Title: Improvements in and relating to machines for making bobbins and other articles of wood
IPC: B27M3/30
Filed: 1925-09-04
Abstract: 239,533. Huber, H. Sept. 4, 19:25. Lathes.-In a lathe for turning wooden bobbins and similar articles, bar stock is fed by gravity from an intermittently rotated carrier to a vertical hollow spindle carrying a rotating chuck which is operated automatically together with the forming and cutting-off tools, an axially moving drill, and ejecting means for the finished articles. A number of rods 9 are held in the carrier 44 which is rotated by a pawl 104, a crank-disc 103 and worm gearing 100 driven by a shaft 85, and are fed singly down a tube 45 to the hollow-spindle 46 which is driven by a belt 49, variable-speed friction gearing 83 and a shaft 81 connected by a belt to a motor. Each rod descends by its own weight and is assisted by pneumatic suction applied to the bottom of the spindle, a braking action being applied by a roller 109 on an arm 106 oscillated by an eccentric 112 so as to press on the rod as it is falling. The rod falls on a stop 8 rotatably mounted on a table 1 by means of a ball-bearing 7 and is centred bv a stationary drill 41 extending through the centre of the stop and projecting slightly above it. After being gripped and rotated by the chuck 47 the rod is acted upon by forming and cutting-off tools carried by slides 11, 12 mounted in radial guides on the table 1 and fed simultaneously by racks and pinions actuated by levers 17, 18 and two eccentrics 15. The levers are slotted for adjustment and the eccentric-rods 16 are adjustable in length. The height of the axle 1 may be varied by two screws 3, interconnected by a shaft 5 and rotated by a hand-wheel 6. In operation, the tools shape the outside of the bobbin and simultaneously the drill 41 is fed upwards by an eccentric 25 to bore the blank and penetrate into the stock 9 so as to form a centre for engagement by the drill when the stock is fed. When the blank has been cut-off, a finger sliding in a radial groove on the table 1 and actuated by an eccentric on the shaft 85 pushes it sideways and through an aperture in the table, after which it is drawn by pneumatic suction along a, duct 51 to a receptacle. The duct may be closed at the bottom when the receptacle is being renewed. On the return stroke of the ejecting finger a spring allows it to yield in passing the stock which has descended on the stop 8. The eccentrics used in the machine have a variable throw controlled by cams. Chucks.-The chuck 47 comprises an axially sliding sleeve 94, Fig. 3, having internal inclined surfaces which engage the bevelled ends of a transversely-movable apertured bar 93. Axial movement of the sleeve is produced by a ram 95- having a rack engaged by a pinion 96 operated by a lever 97 and an eccentric 92. Fig. 1. Cuttings, catching and removing.-A pipe connected through a dust collector to the suction apparatus serves to remove cuttings from the base of the machine, and the suction which draws the finished articles along the duct 51 also frees them from cuttings. Spindle mountings.-The hollow spindle 46 ismounted in the ball bearings shown in Fig. 1.