Patent GB-490472-A (GB)
Title: Improvements in or relating to methods of and apparatus for producing bead chains
IPC: B21L11/12
Filed: 1937-02-19
Abstract: 490,472. Making bead chains. CORNELL, JUN., E. S. Feb. 19, 1937, No. 5087. Convention date, Feb. 19, 1936. [Class 83 (iv)] Forging; stamping; squirting.-A machine adapted for making cold wrought products from bar or like stock is capable of producing bead chains or other articles from a series of metal pieces sheared from a rod and worked at a number of stations to which the blank is brought by a rotating carrier. A motor 12, Fig. 1, drives through gearing 29 and clutch 38 a shaft 15 operating by cam gear 117, 118, 100 a driving member 104, pawl 108 and wheel 81, Fig. 8, which serves as a carrier for the work. The shaft also drives eccentrics 68, connecting-rods 67 and crossheads 65, 61 with projections 69 adjustably attached to projections 72 on a tool slide 71, Fig. 12, carrying a holder 193 with punch 194 and other tools. Two other tool holders 77 and 51 are mounted on the base of the machine and between them is the carrier 81 with a series of bushes 94 for the work. Eccentrics 127 and rods 126 communicate motion from the shaft 15 to a cross-head 124 carrying a tool holder with a series of punches 80 and a gauge pin for entering perforations in the carrier 81. A blank is cut off a rod by a reciprocating knife 149, Fig. 11 and pushed under a spring 157 and against a tapered stop 156, thrusting back slightly a spring pressed block 158. An aperture in the block serves for the passage of an ejector 163 which is reciprocated with the tool slide 81 to move the severed blank into an aperture in the work carrier 81. The means for feeding the rod 152 to the knife is shown in Fig. 5, and involves a reciprocating gripper device with two sets 189, 173 of tapered rollers working in tapered bores 182, 171 respectively. The cross-head 61 in its reciprocation carries with it a projection 167 which engages a projection 180. When the projection 167 is moving towards the right as shown in Fig. 5, the projection 180 is carried with it, springs 181, 186 are compressed, the rollers 189 release the rod and the rollers 173 tightly grip it to prevent movement. The return movement grips the rod and feeds it forward. In Fig. 12 is shown the blank after it has been partly shaped by a punch 80 which pushes it from the work carrier 81 into a die 190 in the holder 51. After this cupping and extruding operation a punch 194 carried by the slide 71 pushes it into the position indicated by chain lines as the punch moves in the direction of the arrow. In the next operation the partly formed article is gripped by the shank and a punch which may be similar to the punch 80 engages the cup part while a heading punch upsets the shank end into a head for locking purposes. The punch also serves as an ejector to replace the work in the carrier 81. The article is reversed in position for assembly purposes by a cam operated segmental gear. Fig. 21 shows the final shaping of the cup to globular form and the simultaneous interengagement of the newly formed element with the last link of the chain. The punch 80 forces the blank 276 forward to surround the shank portion of the last link, and push the cup part against shaping jaws 242 in their closed position. A projection 243 on a slide 240 provided with the jaws 242 engages spring pressed pivoted grippers 261 to open them sufficiently for the punch 80 to pass through and push the article before it into its position for assembly. Specification 490,470 is referred to.