Patent GB-571793-A (GB)
Title: Improvements in and relating to stock feed mechanism for lathes or other machine tools
IPC: B23B13/02
Filed: 1943-12-20
Abstract: 571,793. Bar feeds. PUCKERT, E. W. Dec. 20, 1943, No. 21337. [Class 83 (iii)] In a bar-stock feed for lathes &c., the stock is received in a sleeve 1 supported by an outer sleeve 3 which is carried by a swivel mounting on a standard 4 and is detachably secured at the other end to a standard 21 adjacent the lathe mandrel. An intermediate standard 41 has a double crutch so as to support the sleeve 3 either in alignment with the lathe mandrel or in a laterally-displaced position in which a new stock bar may be inserted in the sleeve 1. The detachable fitting comprises a bracket 19 secured to the sleeve 3 having a pin 23, Fig. 3, projecting therefrom to engage a hole 23<1> in a bracket 20 on the standard 21. A transverse pin 26 with a cut-away portion 27 is rotatable in the bracket 20 by a handle 26<1> so that the pin 23 may be inserted past the cut-away portion, after which rotation of the pin 26 will cause its cylindrical surface to engage a bevelled slot 24 in the pin 23 to draw it tightly into the hole 23<1> with surfaces 30 on the brackets in close contact. The pin 23 is carried by a plate 31 mounted on the bracket 19 by screws 32 to provide axial adjustment of this pin. The stock is fed by a fluid-pressure plunger 2 having a cup leather 11, forming the subjectmatter of Specification 573,588, [Group XXVI], sliding within the sleeve 1 and the fluid supply is controlled by rotating the sleeve through a handle 7, causing the plug 6 of a valve attached thereto to be rotated with a casing 5 which closes the outer end of the sleeve 3 and is connected to a supply pipe 8. The cup 11, which may be of rubber &c., has an axial extension 12 secured within the plunger 2 by a transverse pin 13 whose ends engage the walls of the sleeve 1 and another axial extension 14 engages the valve 6 at the end of the stroke. The plunger 2 acts on the bar stock through an intermediate member 15 having a conical recess 17 to engage stock of different sizes and carrying a self-lubricating plug 18 engaging a ball 16 in a conical recess in the plunger 2. A yoke 33, Fig. 3, prevents the sleeve 3 from being blown away from the machine if the clamp 19, 20 should be released whilst air is being admitted to the plunger 2, through engagement with a pawl 34 on the bracket 19, the pawl being displaceable to allow voluntary removal of the sleeve. The bracket 20 may be attached to the machine instead of to the standard 21. The Provisional Specification states that the sleeve 1 may be connected to the valve plug 6 by a dog clutch allowing lateral movement if the sleeve and plug are out of alignment; that the plug may be connected to the sleeve by a gland to allow ready withdrawal for cleaning purposes; that the plug may have a diametral passage intersecting the axial passage and closed by a plug which is removable to allow cleaning of the passages ; that axial movement of the sleeve 1 within the sleeve 3 may be prevented by pins on one engaging a grooved ring in the other and that the valve casing 5 may have ports on opposite sides so that pipes may lead to the front or back of the machine.