Patent GB-190618969-A (GB)
Title: Improvements in Machines for Forming and Driving Metallic Fasteners or Staples
Inventor: JUSTICE PHILIP MIDDLETON
Filed: 1906-08-24
Granted: 1907-08-22
Abstract: 18,969. Justice, P. M., [Manufacturers' Machine Co.]. Aug. 24. Stapling. - In stapling - machines producing staples from a continuous metal wire or strip, the length of the staples is varied by adjusting the position of the forming and driving mechanism with respect to the feeding and severing mechanism. The driver head 7, Figs. 1, 2, and 4, containing a guideway 8, Fig. 7, and carrying the staple-forming and driving mechanism, is adjustable laterally on supporting-studs 6 mouoted on the frame L of the machine. A former 9, sliding in the guideway 8, is vertically reciprocated by a bell-crank lever 13, Figs. 1 and 2, and a cam 16 on the main shaft 2, and carries at its lower end a grooved die 10, Fig. 4. which presses a severed blank over an anvil 18, Figs. 4 and 9, mounted on a sliding bar 17 reciprocated by a lever 19, Fig. 2, and cam 22. Rotation of the bar 17 is prevented by a lateral arm 23 having a squared end 24 sliding within the forked end 25 of a stud 26 projecting from the driver head 7. The lever 19 has a forked end engaging a bushing 27 sliding on the arm 23 to permit lateral adjustment of the driver head 7. To allow the lever 19 to move if the anvil 18 is accidentally obstructed, the rear jaw of the fork 28, Fig. 2, of the lever 19 is provided with a socket 29 containing a yielding spring stud 30 engaging the bushing 27. The driver bar 33, Fig. 4, s'iding in a guideway 32 in the former 9, has at its upper end a transverse dovetail projection 35, Fig. 2, sliding in a groove 36 in the end of a bar 37, which is raised by a cam 37<a>, Fig. 1, and depressed to drive the staple by a spring arm 40 and a spring 43. The tension of the spring 43 is adjusted by means of a ratchet 44, to which one end of the spring is secured, and a spring-controlled pawl 47 provided with a handle 49. The staples are driven into the work through a throat 50. To adjust the driver head 7 with respect to the feeding and cutting mechanism, a lug 51, Fig. 1, is provided with a projecting stud 52, Fig. 7, engaged by the forked arm 53 of a lever 54 moving between arc-shaped graduated guides 56, which are provided with notches 56<a> engaged by a spring pawl 57, Fig. 1, mounted in a slot 58 in the lever 54. Screws 59 limit the movement of the lever 54. The feeding-mechanism consists of milled wheels 61, 65, Fig. 4, geared together by toothed wheels 63, 64. The wheel 65 is mounted on a loose stud 66 on a swinging arm 67, and is held in engagement with the wheel 61 by a spring 69, Fig. 1, secured to a threaded rod 70 adjusted by a nut 73. To separate the feed-wheels for the initial insertion of the wire or strip, the arm 67 is provided with a lug 76, Fig. 2, through which passes a stud carrying an eccentric attached to a handle 79. The feed-wheels 61, 65 are operated by a ratchet-wheel 80, Fig. 7, engaged by pawls 81 on a carrier 82, operated by segmental gearing 83, 84 and a cam 88. There are three pawls 81 differing in length by a third of the distance between the successive ratchet teeth, thus providing a fine adjustment. To vary the effective throw of the pawls, a shield 89 is adjusted over the ratchet-wheel 80, and is actuated by segmental gearing on a rocking arm 92<a>, Fig. 1, connected by links 95, 96 with the lever 54, so that when the driver head 7 is adjusted to vary the length of the staples, the pawl shield 89 is simultaneously adjusted to regulate the feed proportionately. In order to form staples with legs of different lengths, the feed is adjusted independently of the driver head 7 by means of an eccentric 99, Fig. 7, on the stud 98 by which the link 96 is attached to the lug 97 on the lever 54. The lug 97 is provided with a split bearing 100 tightened by a bolt 101. The staple blanks are severed by cutters 102, 103, Figs. 1 and 4, the upper cutter 103 being secured to a block 105<a> bolted to a slide 105, which is reciprocated in guideways 106 and is normally raised by a spring 107. The slide 105 is depressed to operate the cutter by an arm 111, actuated by a lever 114 and a cam 116. To provide vertical adjustment of the cutter, a screw 117 is interposed between an extension 118 of the lever 114 and the upper surface of the arm 111. The cutting-edges are arranged to serve the strip or wire diagonally, forming pointed legs to the staples. To prevent rebound of the machine at stopping, the shaft 2 is provided with a friction wheel 122, Figs. 2 and 8, engaged by a ball 123, held in a bracket 124 and pressed towards the wheel by a spring stud 125.