Patent GB-190222464-A (GB)
Title: Improvements in Feed Mechanism for Metal Working Machines.
Inventor: HANSON BENGT MAGNUS WILHELM
Filed: 1902-10-15
Granted: 1902-12-18
Abstract: 22,464. Hanson, B. M. W. Oct. 15. Lathes; screwing feed-motions.-A feed-mechanism for lathes, screw-machines, and other similar metal-working machines for operating on stock in the form of rods, is arranged to feed rods of circular or non-circular section. A chuck for holding the rod while being machined consists of an enlarged head 6<1> on a hollow spindle 6, Fig. 2, having a screwed flanged cap 9 to hold in place a split chuck 10, which is closed by the forward movement of a tube 8 with a coned head 8<1> against the action of a spring. The hollow spindle 6, supported in standards 2, carries a driving-pulley 12, a collar 20, locked by a nut 21, a loose collar 13, and a chuck 32, Fig. 1, forming part of the feedmechanism. The collar 20 is slotted to receive bell cranks 22 operated by the loose collar 13, to thrust forwards the tube 8 to close the chuck 10. The loose collar is operated by a handle 18<1>, Fig. 1, through a yoke 16 sliding on a pin 15, supported on a bracket 3 on which the handle is pivoted. The chuck 32, Fig. 3, is of the self-centering type, the body 25 being secured to the spindle 6. The cam-ring 32<2>, which has a limited angular movement on it, is operated by a "tommy" &c. to bring rollers 28 on blocks 26 into engagement with the stock or with a tube 70 in which the stock cannot rotate. The rollers are hollowed and ribbed to ensure the rotation of the stock or tube with the chuck and spindle. The projections 26<1> on the blocks are made a slack fit in the camgrooves 33, and the blocks are pressed inwards by spring pins 30 engaging cam-surfaces 32<1> on the cam-ring, so that the rollers may yield to unevenness in the stock. A feed-chuck 45, of similar construction to the chuck 32, is secured in a bearing 4 and is operated simultaneously with the main chuck 10 by pins 62 on an arm 18<3> of the handle 18<1> engaging a pin 68 on the cam-ring 45', one chuck being opened when the other is closed. The rollers 48 are preferably ribbed, and are skewmounted so that, when brought into contact with the stock or feed-tube 70. they feed it forwards, the stock psssing through the open chuck 10 against an adjustable stop. The feed ceases when the rollers 48 are retracted and the main chuck closed. An undercut projection 55 on the ring 32' passes into an undercut recess 56 in the ring 45<1> to prevent lubricant from being thrown off. The operation of the feed-chuck may be made automatic. The feed-tube 70, which is used with stock of non-circular section, passes through a strengthening-bush 23 in the rear end of the spindle 6, and enters the tube 8, its front end being split to receive interchangeable bushings 82, 82<1>, Fig. 17, to grip the stock frictionally. The rear end of the tube carries a corresponding undivided bushing held in place by a screw 76, Fig. 14, which also secures a ring 75 on a stepped collar 73 clamped on the tube. An eye 72<1> on a sleeve 72 travelling on a guide-rod 71 engaged between the ring 75 and collar 73, and serves to return the feed-tube by means of a weight 87 when the tube is released by the feed-chuck, a buffer spring 90 being inserted between the sleeve and a standard 1. For guiding the stock bar, rod, or wire, a standard 84 with a bushing 85 is detachably mounted on the standard 1. When the tube 70 is not required, it may be removed and the eye 72<1> turned downwards, as shown in dotted lines in Fig. 1.