Patent GB-395295-A (GB)
Title: Improvements in and relating to the manufacture of wire nails
IPC: B21G3/18
Filed: 1933-02-24
Abstract: 395,295. Forging nails. WIKSCHTRÍM, J., 14, Tiergartenstrasse, Dusseldorf, Germany. Feb. 24, 1933, No. 5709. Convention date, Jan. 19. [Class 83 (iv).] Forging-machines; dies.-In a machine for manufacturing wire nails of the general character described in Specification 385,245 wherein wire 4 is fed vertically from a coil 5 below the machine the horizontally swinging lever 11, Fig. 7, carrying one of the wire clamping jaws 13 and one of the point cutting blades 14 is actuated about its pivot 12 towards the stationary block 15 carrying the other clamping jaw 17 and the other point cutting blade 18 by the toggle 45, 46 straightened by a thrust rod 40 operated by a two-armed lever on the shaft 34 and a cam on the shaft 10 and broken by the pressure of a spring 52 and rod 51 pivoted to lever 11, and the lever arm 82 carrying the heading plunger 83 is reciprocated vertically by a double toggle device comprising an upper link 68 pivoting at 75 on an abutment member 70, a lower link 72 provided with pivot pins 73, 74 engaging bearings 60, 61 sliding in guides in the framework, and two vertical arms 64, 65 of a three-armed lever 64, 65, 66 provided with pivot pins 62, 63 engaging bearings 58, 59 sliding in the framework guides, the arm 66 of the three-armed lever carrying a roller 80 engaging a double cam 81 on shaft 10 which gives the heading plunger 83 a double action for upsetting in two stages. The toggle is broken and the heading plunger 83 held in raised position by a spring 87 and rod 86 connected to the lever arm 82. The heading plunger 83 is adjustable in the lever arm 82 by a screw 85, Fig. 8, and is clamped in adjusted position by a wedge 39 and screw 84. The lever arm is swung horizontally between its two upsetting strokes by a rod 90, Fig. 2, operated by an arm 97 on a shaft 96 carrying a second arm 98, Fig. 3, engaged by a strap 102 actuated by a twoarmed lever 103, 104 and cam 105 on shaft 10. After the heading operation the clamping jaw arm 11 is released and the wire is fed upwards a nail length by a feeding jaw 152 on a swinging lever 151 operated against the action of a spring 161 by a rod 162, rocking lever 160, Fig. 1, link 159 and rocking lever 158 engaging cam 157 on shaft 10. The guide member 123 through the end 124 of which the wire passes is in the form of a spring mounted on a shaft 122 which is rocked to bring the wire between the point cutting blades 14, 18 by a thrust rod 131, Fig. 1, engaging an arm 125 on the shaft 122. During the return swing of feeding member 152 the pressure of the coacting feed roller 140 mounted on the two-armed lever 138, 139 is relaxed against the pressure of spring 142 by means of the thrust rod 141 and two-armed lever 144, 145 operated by cam 146. After the blades 14, 18 have pointed and severed the nail the latter is ejected by the ejector 109 pivoted at 108 and actuated by the lever arm 82 engaging a roller 111 on the back of the ejector. Clamping jaw 13 is positioned in lever 11 by packing strip 24, Fig. 8, and jaw 17 is adjusted by screw 22, both jaws being secured in position by clamp screws 20 ; point cutters 14, 18 are positioned by packing strip 33, Fig. 9, and screws 27, 30 and secured by screws 21. Adjustable screws 134, 135 in the lever 11 coact with the guide 124 to locate the wire in proper position for the head forming and pointing operations.