Patent GB-296748-A (GB)
Title: Improvements in or relating to machines for forming wire articles
IPC: B21F45/00
Filed: 1927-06-07
Abstract: 296,748. Jackson, L. Mellersh-, (American Chain Co., Inc.). June 7, 1927. Making wire articles; angular bending; dies and formers; shearing- adjuncts. - In a machine for forming wire articles such as cotter pins, wire from a con tinuous supply is first fed across a stationary die and is severed while in this position, is then fed between the jaws of the die to bend it, is then fed to and acted on by a movable die and is finally fed to and acted on bv a second stationary die. The wire 47 which mav be of half-round section. is drawn through straightening rolls 50, 51 and a guide 7<x> and forced through an adjustable guide 54, 55 by feed rolls 45, 46 which are geared together and driven by gearing 25, 24 from the main shaft 19. The gear wheel on the shaft 31 is frictionally clamped to a sleeve keyed to the shaft and the main driving pulley is connected by a shear pin to a sleeve fixed to the shaft so that it is put out of action if the wire breaks or jams. The shaft 36 is mounted,at one end in a fixed bearing and at the other end in a bearing carried by a pivoted arm 38 controlled by a spring 43 adjustable by a nut 44 on a pivoted rod 41 so as to suit wires of different diameters. The roll 46 is plain and the roll 45 has a pair of half-round grooves so that it may be turned end for end when desired. The wire passes from the guide.into a notch 60 in a stop plate 61 adjustable by a slot 62 and bolt 63 and fixed in position by a set screw 66 according to the length of article. A length of wire. is cut off against the end of the guide 55 by a toothed cutter 77 which is mounted on a bolt 76 and is connected by lugs 90 and recesses to a sleeve 71 mounted in an adjustable member 72. The cutter is driven by helical gear from the shaft 31. The severed blank is engaged by one of a number of pins 91 passed through some of the pintles 90 of a chain 84, which is maintained taut on its operative side by an adjustable idler 88. The chain wheel 83 is driven by gearing from the shaft 19 and is secured to its shaft through a sleeve and shear pin. The pins are headed at 91<1> and formed with steps 92, 93 of different diameter. During the downward motion of the taut run of the chain the head 91<1> first engages a grooved guide 103 and the part 92 forces the blank,through a removable die 94 to bend it into U-shape, preferably with one limb longer than the other. The die is fitted with a recessed hardened steel block. The bent wire is then forced between a pair of replaceable rolls 98 having recesses 99, 100 to form the eye as shown in Fig. 8. The rolls are adjustably mounted by bolts and slots 102 on sprocket wheels 101 which are rotated by the chain, the roll shafts being also geared together. As the chain continues its movement the heads of the pins engage guides with cam flanges 105 so as to withdraw the pins whereupon the parts 93 become operative to force the blank through a replaceable die 106 to press the legs together as shown in Fig. 9. The pin is then withdrawn by the cam 105 to release the completed article which drops out of the machine, whereupon the cam 109 returns the pin to its normal position. The base 15 of the machine is formed as a tank and is partly filled with oil for lubricating the mechanism and has a lid 16 and a clean out opening in its base closed' by a door.