Patent GB-191126094-A (GB)
Title: Improvements in Machines for Straightening Light Bars, Needles and the like.
IPC: B21F1/02
Filed: 1910-12-09
Granted: 1912-01-09
Abstract: 26,094. Singer Manufacturing Co., Singer & Tivendale, W., and Noon, H. E. Dec. 9, 1910. [Cognate Application, 26,095/11.] Straightening; power hammers. - In a machine for straightening l i g h t bars, needles, wires, &c., by means of a hammer, the impact of the hammer is automatically adjusted by a regulator controlled by the eccentricities of the needle &c. In the form shown in Figs. 1 and 2, the sewing-machine needles n are fed from a reciprocating hopper into the automaticallyoperated spring jaws 55 of a rotating chuck 51 carried by a cam-operated slide 27 which conveys the bent articles over an anvil plate 135 with a bevelled edge 136, in front of which the helved hammer 145 is oscillated. The article passes through a pair of jaws 199, 205 carried by arms 198, 203, the arm 198 being rigid. The arms are connected to a block 197, clamped on a shaft 192, to which is attached by the rods 190, 188 a sliding wedge-shaped block 182, which acts as a stop for the forward motion of the hammer. The hammer is held out of operation during the forward motion of the work by a stop bar 218, but is released for the return motion. The jaws 205, 199 form a floating member as the shaft 192 is counterbalanced by a weighted rod 208, and any deflexions in the rotating needle move down the jaws and so adjust the position of the stroke - adjusting member 182. The upward movement of the jaws is limited by a screw 215 engaging the anvil block 132. The anvil plate 135 is vertically adjusted to a position slightly greater than a half diameter of the needle below the axis of the chuck by a screw-adjusted T-headed inclined plate 140. The nose piece 145 is secured by a screw to the hammer head 148, which is adjustably secured on the helve by a set screw 150. The hammer helve, which is operated by a cam 159 from a shaft rotated from the main shaft 5 by worm gear, is clamped to the shaft 153 and carries a lateral extension 178 which is fixed by screws 179, 180 on a striker plate 177 clamped on the shaft 153 and engaging the stop member, the screws serving to determine the normal forward limit of the stroke. The blow of the hammer is regulated by a spring 173 which is connected to an arm 171 angularly adjustable on the shaft 153 and fixed by a clamping - screw. The machine is fully described in Specification 28,625/10. In the form shown in Figs. 1, 5, and 8 of Provisional Specification 26,095/11, which is fully described in Specification 28,625/10, the needles are conveyed by a slide forming the bottom of a hopper 142 into a semicircular recess in a hardened bushing 75 mounted in a recess in plate 73 fixed to a slide 65 which is camactuated to feed the work over the anvil 53. The slide also carries fingers for ejecting straightened blanks. The needle is rotated by a rotary friction wheel 82 mounted on a shaft 83 inclined to the semicircular recess and to the direction of travel and automatically raised against the action of a spring 91 to admit the blanks into the bushing. The anvil is vertically. adjusted in a laterally adjustable channelled block 56 by means of a screw 55, and is clamped in adjusted position by a screw 57. The needle engages a conical hole 201, Fig. 5, formed between two tongued and recessed jaws 198, 199 which are channelled to fit upon, and are adjustable by slots and screws in, the flanged ends of arms 195, which spring laterally to follow the circular movements of the unstraightened needle, and have elastic shanks 194 clamped to a block 191 on the rock-shaft 171 to adapt them for taking larger needles accidentally inserted into the hopper and act as a recoil absorber to prevent excessive overthrows of the regulator. The opposite faces of the block are slightly convergent and the arms can therefore be adjusted towards or from each other by screws 193. The impact regulator 165 is carried by a spring stem 167 adjustably secured to the rock-shaft which is provided with a counterbalancing-lever 183, the motion of the shaft being limited by stops 186 engaging the lever 183, to ensure against overthrow under abnormal conditions of control imparted by the action of the hammer. The impact regulator slides between a curved abutment 164 and a striker 42 on the hammer shaft 34. The hammer is clamped on the shaft, its normal forward limit being adjusted by screws on the striker engaging the split hub of the hammer helve. The hammer is operated by a toothed cam 29 engaging an arm 31 on a hub on the shaft which carries a second arm 36 provided with a spring 38 for assisting the blow of the hammer. The hammer is held out of operation by a cam-operated stop 214. In a further modification, the impact regulator consists of a lever 232, Fig. 10, engaging the striker 41 and being mounted on a pivot 229 connected by an arm 233 to a lever 236 connected to the rock-shaft. The hammer, impact regulator, and feeler jaws 198.&c. may move in curved paths or otherwise.