Patent GB-191307520-A (GB)
Title: Improvements in Fastener Inserting Machine.
Inventor: THOMPSON WILLIAM PHILLIPS
IPC: A43D69/04
Filed: 1912-04-04
Granted: 1913-06-04
Abstract: 7520. Thompson, W. P., [Champion Shoe Machinery Co.]. April 4. Nailing.-A nailing or like machine for boots, shoes, &c. in which the direction of clinch of the nail is predetermined by bending its point has the nails bent by the movement of the driver throat. The nails are driven by a driver 28 held in a driver bar 27 reciprocated in bearings by a pitman 33 connected with a crank 24 on the main shaft. An eccentric connexion between the pitman and the driver enables the driver to be adjusted vertically. The driver 28 passes through a driver guide 45 which is bored to receive a sleeve, the upper end of which is bored to receive the driver and which is provided at its lower end with a saw-cut to furnish an angular guiding-portion for the rectangular lower end of the driver. A driver throat 52, pivoted on a shaft supported in the machine frame, is normally pressed against a stop 59 by a spring; in this position, the driver is in alinement with the throat. A lever 60 operated from a cam on the main shaft assists in returning the throat to its normal position after displacement. The nails in spring form are fed through a guide 65 pivoted on the shaft supporting the driver throat and provided with an arm 69 which is normally held against a stop 70 on the machine frame by a strong spring 71. The guide is provided with a groove 72, Fig. 15, for the nails, the upper part of which is covered by a resilient plate 73 having a stepped lower edge. The steps are arranged for the lengths of nails fed, and by bringing the desired stepped part over the groove, the projecting heads of the nails are engaged and back feed of the string is prevented. The nails are cut from the string by a cutter 78 mounted in an arm 80. The arm 80 is pivoted at 83 to one end of a lever 84, and a spring 85 tends to turn the arm 80 in a counter-clockwise direction on the lever. The lever is pivoted at 86 on the machine frame, and is provided with a forked end 87 embracing an' eccentric 88 on the drive shaft. The throat is provided with a depending portion which extends into an opening in a pressure plate, and one side of this portion is channelled to take a guide-member 91, Fig. 5, which carries a fin 93 projecting into and forming one side of the driver passage. The member 91 is loosely pivoted on a stud 92, and is pressed inwards by a spring plunger 95. A cutting-die 97 cooperating with the cutter 78 is secured to the upper side of the throat. The upper edge of this cutter is bevelled as shown at 98. To enable the nails to be cut off square, the upper side of the throat and the cutter 97 are curved with the pivot of the throat as the centre of the curve, As the throat moves from the position shown in Fig. 1 to that shown in Fig. 4, the cutter 78 engages the head of the end nail in the groove 72 and feeds it downwards into the throat 52, the upper end of which is wider at the top than the head of the nail so as to permit the nail to be fed into it as the throat moves. The movement of the throat causes a bend to be formed in the shank of the succeeding nail, and as the cutter 78 moves to sever the nail from the string, the shank part of the nail is partially straightened. Since the cutter 78 acts practically as a clamp rather than a cutter, the bend at the extreme tip of the nail is accentuated as shown in Fig. 17, the actual cutting operation being performed by the bevelled end of the die 97. After the nail has been cut, the lever 84 is retracted a little, thus lifting the cutter 78 from the throat 52 and preventing movement of the cut-off nail, during the backward movement of the arm 80 and the throat 52. The throat is then returned to a position in alinement with the driver and the nail-driver, the fin 93 in the driver channel supporting the nail against transverse movement until it enters the stock. The turned point of the nail predetermines the clinch of the nail and enables it to be used, as shown in Fig. 23, for securing together the outsole, the insole, upper, and tapsole of a McKay shoe without fear of the upper being spoilt by a wrongly clinched nail, all the nails being clinched in the line of the seam. The throat 52 is moved out of alinement with the driver and into alinement with the nail feed by the movement of the awl to feed the work. The awl is mounted in a carrier 100, Fig. 3, having a shank 102, Fig. 1, adapted to rock and slide in a bearing 103 on the machine head. The carrier is rocked by an arm 104, Fig. 3, on the carrier connected through a block 106 with the forked end of a cam-operated lever 105. The sliding motion is given by a lever 108 pivoted on the frame and operated from the cam shaft. The lower end of the lever engages the carrier through a screw 111, Fig. 1. The carrier is returned after its movements due to the lever 108 by a spring situated in its bearing. A screw provided with a head 115 is threaded into the carrier shank 102 and extends through the end of the bearing. By turning this screw, the backward movement of the carrier is varied and thus the awl feed adjusted. The screw 111 adjusts the position of the awl hole with reference to the driver. The invention is stated to be applicable to loose-nailing machines and to machines in which the fastener stock is in the form of wire.