Patent GB-190120981-A (GB)
Title: Improvements in Machinery for the Manufacture of Tacks, Nails, or the like
Inventor: GIFFORD JAMES NELSON
Filed: 1901-10-19
Granted: 1902-10-09
Abstract: 20,981. Gifford, J. N., and Hunt, C. D. Oct. 19. Nails, tacks, and the like, making. Relates to mechanism for cutting up sheets or strips of metal into tack or nail &c. blanks and for heading the blanks to form finished tacks &c. Ordinary tack strips, which have a width about equal to the length of a tack, may be cut up by this machine ; but the machine is especially adapted for cutting up sheets having a width equal to that of several strips. Figs. 11 and 12 show the method of cutting employed. The sheet 50 is rocked to and fro as usual. When in the position shown in Fig. 11, a blank shaped and arranged as shown by 51 is cut off by the centre knife 11 and leader knife 12, and, when in the position shown in Fig. 12, a blank shaped and arranged as shown by 53 is cut off by the centre knife 11 and leader knife 13, which makes a longitudinal as well as a transverse cut. The dotted lines show how the succeeding blanks are cut off. When a strip has thus been cut off the edge of the sheet 50, it is drawn back for its full length, and then fed laterally, and another strip is cut into blanks as before. The knife 11 makes two strokes to one stroke of the knife 12 or 13, i.e., it moves in company first with the knife 12 and then with the knife 13. These movements are effected by cams 25. 26 on the main shaft 27. The sheet 50, Fig. 4, is fed forwards step by step to abut agdnst the adjustable stop 500 by a weighted cord 71 attached to the slide 61, upon which slides transversely the upper slide 63, which has a horizontal arm to which the sheet is clamped. The slide 61 and sheet 50 are drawn backwards to start another series of cuts by means of a cord 85, Figs. 4 and 21, which is wound on a roller 78 connected to the constantlyrotating shaft 77 by a clutch 76 operated by a lever 74. The lever is moved by a notched disc 71 turned through an arc by a pin 68 on a rod 66. Stops on this rod engage with an arm on the slide 61. The slide 63 and sheet 50 are moved laterally by a weighted cord when the clamp 91 is released by the tail 92 striking the lug 93. The clamp 91 is hinged to the slide 61, and serves to firmly connect this slide and the slide 63. The table 33 and sheet 50 are vibrated to the right and left, as shown in Figs. 11 and 12, by the fork 36 which engages with the arm 35 and turns the table round the centre 34. The shaft 37 carrying the fork is rocked by a crank on the wheel 41. Beneath each knife 12, 13 is a spring pin 122, Figs. 4 and 5, rocked on the pivot 130 by a rod 132 and a cam on the shaft 82. Each blank is pressed against the pin 122 and carried down by the knife 12 or 13, until the blank is gripped between the fixed die 7 and movable die 107 worked by the cam 109. After the blank has been thus gripped, the pin 122 is moved aside, and the blank is headed by one or other of the headers 112, 113, which act alternately. The headers are actuated by wedges 114 worked by oonnecting-rods and cranks on the shaft 82. The finished tack is removed by a spring stripper 140 actuated by the lever 41, rod 142, and a cam on the shaft 27.