Patent GB-519738-A (GB)
Title: Improvements in metal-shaping machines
IPC: B23D1/08
Filed: 1938-09-29
Abstract: 519,738. Shaping.. AUTOMOTIVE MAINTENANCE MACHINERY CO. Sept. 29, 1938, No. 28360. Convention date, Oct. 4, 1937. [Class 83 (iii)] [Also in Group XXIV] A metal-shaping machine has a flexible driving member connecting the ram driving mechanism with the cross feed of the work table. The ' machine is mounted on a stand 30 with top plate 34 and under shelf 33 on which the driving motor 35 is supported. The housing 37 carries a reciprocating tool ram 38 and an adjustable work support 41 having both manual and automatic lateral feed. The work 43 is secured in a vice 42. A belt 50 connects the motor to a power shaft 54 carrying stepped pulleys 56 connected to stepped pulleys 57 on a shaft 58 carrying a driving gear 59 engaging a gear 60 preferably of fibrous material and having a separate hub 61 journalled in the housing. The centre part of the gear hub is recessed to receive a plate 67 carrying a stud 68 secured by a nut 68a and a dovetail slot 69 is formed in the plate and in the flanged end of the hub to receive the adjustable crank plate 65, which is clamped in adjusted position against the grooves in the hub flange by tensioning the stud 68 by tightening the nut 68a. The crank operates an oscillating link 70 pivoted at 72 and connected by a link 73 and lug 76 to a slot in the ram, the slot serving to alter the limits of the ram stroke. The oscillating link is provided with a scale to facilitate setting the crank for the required travel and carries a slide block 81-receiving the crank pin 66. The tool head, Fig. 4, includes a tool 40 secured to the usual clapper which is mounted on a slide, adjustable by means of a screw 101. The head 97 carrying this slide is also angularly adjustable by means of a shank 92 which is secured after adjustment by a bevelled pin 95 engaging a tapered part 93. The work table is vertically adjustable by a screw 113 and the transverse slide is guided on ways 117, 118. The outer end of the table is guided by a horizontal plate 122 which is adjusted at the required height on a standard 121 and locked by a screw 123. The table is fed by a screw 140 which may be operated manually by a handle 144 or automatically by a gear 150 engaging a gear 153 rotatable by a spring-pressed pawl 164 carried in an arm 157 on a rocking shaft 154. The pawl holder may be rotated through 180 degrees to effect the feed in either direction and the gear 150 may be slid out of engagement when the manual feed is used. For operating the feed an arm 170 on the shaft 154 is connected to a piston member 172, Fig. 11; working in a cylinder carried by the vertical slide 110. The piston is connected to the cable 175 of a flexible shaft 176, the other end of the cable being secured to a piston 177 in a cylinder 178 carried by a boss 62 on the housing 37. The piston 177 is operated by an eccentric strap 182 secured to the hub of the gear 61 so that the flexible wire is reciprocated in its casing to operate the feed in timed relation with the reciprocation of the ram, the feed being effected on the return strokes. The flexible shaft includes an outer covering 190 surrounding a rubber layer 191 vulcanized to a flexible metal tube 192 comprising interlocking flexible sections. The tubing houses a wire spring 193 of close fitting coils. The spring is noncompressible and the tubing nonexpansible so that neither expansion nor contraction of the assembly can occur. The operating cable 175 fits snugly with the spring 193. Each end fitting includes a threaded nozzle 200 screwing into the piston chambers and having a depending portion 202 provided with flexible fingers 203 and fitting over the flexible shaft and threaded into a nut 204. The nut has tapered inner surfaces which when the nut is screwed up forces the fingers 203 inwardly to grip,the outer covering 190. The lateral feed may be varied by means of shrouds 222, 223 on a plate member 221 which may be set to alter the point of pick-up of the pawl mechanism. In a modification of the means for operating the flexible cable for a lateral feed, the operating piston is actuated by means of an eccentric rib on the back of the gear 60 of the crank mechanism. In another modification the hub of the gear 60 is provided with an eccentric or helical camway for actuating the piston. In another modification the flexible cable connection is replaced by a flexible fluid. link which transmits the movement of the drive piston to the piston which operates the feed arm 170.