Patent GB-359076-A (GB)
Title: Improvements in or relating to feeding bar stock in lathes and like machines
IPC: B23Q1/76
Filed: 1930-07-28
Abstract: 359,076. Turning. P. F. A. G., PATENTVERWERTUNGS- & FINANZIERUNGS-AKT.-GES., 3, L÷wenstrasse, Zurich, Switzerland. July 28, 1930, No. 22658. Convention date, Aug. 31, 1929. [Class 83 (iii).] In a device for feeding bar stock particularly to lathes for making wooden spools a reciprocating g saddle member carries a clamp which moves the bar forward during movement of the saddle in one direction, the clamp being actuated by the relative axial movement of a carriage slidably mounted on the saddle. The saddle 2 is guided on bars 8 and a carriage 17 axially movable on the saddle carries a roller 3 engaging a cam 4 mounted on a shaft 6, movement of the carriage thus imparting positive upward movement to the saddle against the resistance of springs 7. In the lower position the carriage and saddle rest on a rubber buffer 10 connected to a spring-mounted abutment 12. The work bar 20 is guided in a bore 2b in the saddle which is provided with three radial slides 21 each having a ball bearing roller 22 engaging the work-bar. The slides 21 are actuated by two-armed levers 24 whose lower arms engage inclined slots 26 in the carriage 17 so that relative axial movement of the carriage on the saddle causes the gripping-rollers to be moved radially to and from the work-bar. When the carriage and saddle are moved upwardly by the cam, a hook 28 on the saddle engages a latch-bolt 29 operated through a lever 33 by a stud 31 on a cam disc 30 mounted on the control shaft. After the latching of the saddle the cam 4 allows the carriage to be moved down by a spring 18, this movement engaging the gripping rollers with the bar. At this point the saddle is released by withdrawal of the latch-bolt, and the saddle together with the work-bar and the carriage is moved downwards by the springs 7 to free the work-bar. When the carriage strikes the buffer 10 the spring 18 is compressed and the clamping-rollers are opened in readiness for the next upward movement. A number of work-bars 20 are mounted in spaced guide tubes 36 in a magazine coaxial with the control shaft, one of the guide tubes being located above the bore 2b. The magazine is fed automatically when a fresh work-bar is required by means of a ratchet wheel 39 coacting with a pawl 40 carried by a feed-lever 41 operated through a lever 45 by the cam disc 30. The lever 41 bears at one end against the work-bar and this contact normally prevents the pawl 40 from making a full stroke so as to operate its ratchet wheel. When the work-bar passes below the level of the lever 41, this lever can be pulled back by a spring 42 so that on the next actuation of the feed-lever the magazine is rotated and the next work-bar drops on to the end of the bar being worked and is fed by gravity to the chuck. Fig. 8 shows the general machine arrangement, a motor-driven hollow spindle being provided through which the stock bars are fed to a working chamber 52. A separate compartment 53 contains motordriven gearing 54 for the control shaft 6. The bore 2b may be provided with antifriction rollers to facilitate the passage of the stock-bar therethrough.