Patent GB-825774-A (GB)
Title: Mechanism for shaping shank stiffeners
IPC: B21D53/00
Filed: 1956-11-27
Abstract: 825,774. Making shoe shank stiffeners; angular bending; punching; shearing. PEAKE, N. S. Dec. 23, 1957 [Nov. 27, 1956], No. 36252/56. Classes 83 (2) and 83 (4). A mechanism for producing a shaped shank stiffener from a strip-form blank comprises means for feeding the blank, pressing means which are movable to engage the travelling blank and bend it during such travel, and means adjustable to vary the movement of said pressing means relatively to the blank feeding means and thereby control the bending imparted to the blank. Metal strip stock 12 from a reel 11 is fed to punching and severing means by rollers 13, 14 the roller 13 being intermittently rotated by a ratchet 18 engaged by a pawl 19 on a bell crank 21 rocked by a link 22. The link 22 is pivoted at a radial position adjustable to vary the length of strip fed, on a wheel 23 on a shaft 24 rotated by a chain 29 from a sprocket 75 driven by an electric motor 10. The strip is guided by rollers 38 on to an anvil 55 where, when the strip is stationary, recesses 5 and 6, Fig. 6, are punched out of it by elements 53, 54 on a punch 52 reciprocated by an eccentric strap 49 on a shaft 39 driven by the motor 10, waste metal falling through a shoot 57. A knife 59 on the punch 52 almost immediately then cutting off the previously punched strip lying beyond the anvil 55 and springing and pushing the end of the freshly cut blank on to a shoulder 61 of a pusher block 60, the leading end of this blank engaging a positioning chamfer 65 in an upper jaw 63 between which and a lower jaw 64 the blank is guided. The block 60 is then advanced by a rod 37, reciprocated by a bell crank 35 rocked by a cam 30 on the shaft 24, to forward the blank into the nip between rolls 67, 68 which co-operate to form a groove 7 in the blank. The lower roll 68, which is ridged at 98, is secured on a shaft 88 driven, through gearing, by the motor 10. The upper roll 67, which is grooved at 97, is secured on a shaft 93 driven, through a chain 91 by the shaft 88 and supported in bearings 99 adjustable vertically, to vary the depth of the groove 7 formed in the blank, by screws 105 linked by gears 106, 107 to ensure that both bearings 99 are equally adjusted. As the blank emerges from the nip between the rolls 67, 68 a pin 69 on an arm 112 is swung up to engage the blank and press it towards the roll 67. The arm 112 is carried by a pivoted arm 113 rocked by a link 115 adjustably connected to a bell-crank 122, so that the stroke of the pin 69 and thus the length of the portion of the blank bent may be varied. The bell-crank 122 is rocked by a sleeve 124 on the roll shaft 93 moved axially by a rod 128, coaxial with the shaft 93, moved by a bell-crank 129, pivoted to a bracket 130 carried by the rotating shaft 93. A roller 131 at the end of the bell crank 129 engages an edge 139 of a cam 132 to rock the bell crank as the roller is traversed over the cam. The cam 132 is adjustable horizontally by a screw 136 thus varying the amplitude of movement of the pin 69 and is adjustable vertically by a screw 141 to vary the position along the blank at which the bending effected by the pin 69 starts. To form a reverse bend 3 on the blank, a bolt 145 carried on an arm 143 on the shaft 93 co-operates with a shoulder of a recess 147 in the roll 68, to engage the end of the blank. The bolt 145 is adjustable radially and angularly of the shaft 93. The bending unit is adjustable as a whole to or from the punching and shearing unit.