Patent GB-191403876-A (GB)
Title: Improvements in or relating to Pulling-over and like Machines.
IPC: A43D13/00
Filed: 1914-02-14
Granted: 1915-02-11
Abstract: 3876. Gimson & Co., Mills, W. P., and Bagshaw, C. M. Feb. 14. [Cognate Application, 15,146/14.] Pulling - over.-Relates to pulling-over machines of the kind in which the stretching of the upper over the last is performed by the operator, after which power-driven means wipe in the edge 2 of the strained upper and secure it to the insole, and consists in an arrangement whereby the last remains stationary during t h e entire operation of the machine, w h i l e t h e stretching operation of the upper is effected entirely by manipulating the pincers. The last is supported on roughened feet 13, 14, Fig. 1, relatively adjustable vertically on a rest 12, which is carried by a bracket 17 bolted to a stand 19 so that adjustment may be effected for different classes of work. The bracket 19 also carries an adjustable heel rest 46, which is rocked after adjustment by a pawl and ratchet 55, 54. The upper is engaged by toe and side pincers T, S each of which comprises a pair of jaws 22, 23, Fig. 7, mounted in a spring-pressed casing 24 slidable in a frame 25 ; the jaws are held in the position shown in Fig. 7 by a blade spring 33, but are adapted to be swung, when closed, about the pivot 27. The closing of the jaws is effected by a roller 29 mounted between links 30, 31 pivotally carried by a rod 28, the lower end of which is connected by a link 40 and universal joints 41 to a slidable rod 39 carried by a slide 35 ; this slide is connected to a treadle 36, Fig. 1, by a link 37. The rods 39 are fitted with springs 42 so that the pull on the rods 28 is a yielding one, and in order that the pull of each side gripper may accommodate itself to the work, the springs 42 of the side grippers bear upon an equalizing-bar 43, Fig. 1, carried by the slide 35 ; this bar may be furnished with a hand-lever in order that the operator may tilt the bar and so "humour" the upper to adjust it to the last. Preferably, the toe-pincers are arranged to grip the upper before the side pincers, this being effected by movement of a knee-lever 57, Fig. 7, which withdraws a projection 58 from beneath a collar 59 on the rod 39 of the toe-pincers, and allows the spring 42 to close the jaws without, however, lowering the pincers. A hand-lever 60 is provided for opening the jaws again, when it is necessary to obtain a new grip on the upper, by raising the rod 39 and allowing the projection 58 to be returned by a spring to its position beneath the collar 59. When this provision is made for initially closing the jaws of the toe-pincers, the pull of the upper at the toe when the treadle 36 is depressed is in advance of that at the side of the upper, but the pull of all three grippers may take place simultaneously. During this stretching of the upper, the pull of the grippers, particularly the side grippers, may be relieved by raising the rods 39 by means of connexions 64 with a hand-lever 63 ; with this provision, the pull on the upper takes the form of a series of short pulls instead of a direct steady strain. When the upper has been stretched and adjusted to the satisfaction of the operator, the treadle 36 and the pincers are locked by independent locking-mechanisms. The treadle locking- mechanism comprises a pawl and ratchet 66, 68, Fig. 1, which is subsequently released by levers 69, 70 operated from a cam 72 on the shaft 6. The pawl may, however, be released independently of this power-mechanism by a wedge 73 carried by a slide 75 operated from a hand-lever 74 ; if desired, the automatic actuation of the treadle locking- mechanism may be deferred by a pivoted plate 81, which is movable into pawl-controlling position by connexions 80, 79, with a push-knob 76. The pincers are locked by ratchet-mechanisms 86, 87, Fig. 1 ; the pawls are normally inoperative, but are permitted to become operative by cam-actuated mechanism as soon as the treadle 9 is depressed to throw the power-mechanism of the machine into operation. The frame 25 of the toe pincer-mechanism is pivoted at 91 to the machine frame, while the frames 25 of the side pincer mechanism are rotatably supported in collars 92 having trunnions 93 mounted in the machine frame ; the side pincer mechanisms are adapted to be moved along lines at right-angles to the centre line of the last, but they may be arranged to move at an angle to this line to suit various forms of lasts. The side pincer-mechanisms are movable bodily towards and away from the toe-pincer by means of hand-levers 96, while they can also be adjusted by shifting the trunnions axially by means of hand-wheels 94. The mechanisms are, however, automatically returned to their normal positions on the completion of the operation of the machine by plungers 97 actuated by screws 100 in arms 101 attached to the slide 35 ; these plungers co-operate with inclined guides in grooves in the hand-wheels 94. The oscillatory movements of the pincer-mechanisms about their pivots 91, 93 are effected from a spring- controlled and cam-actuated lever 107, which is adjustably connected to the frame 25 of the toe pincer-mechanism by a two-part rod 109 and spring 112, Fig. 5, and to each side pincer mechanism by an adjustable coupling 121, 120 having a yielding connexion with a bell-crank 114, and a ball-ended rod 116, which engages a block 118 slidable in the frame 25. As the pincer-mechanisms close towards the centre of the machine the upper is forced against the corners of the last by spring-pressed clamping-plates 127, Fig. 6, slidably mounted on the frames 25 ; these plates yield during the continued inward movement of the pincer-mechanisms, when wipers 128 fixed to or formed by the upper portions of the frames 25 wipe the edge of the upper under the last. The amount of yield of the plates is adjusted by a screw 135 to determine the inward position of the wipers, and consequently the position of the tacks, which are fed from an ordinary supply mechanism into pockets 133 in the wipers. Upon, or before, the completion of the wiping-in operation, and prior to the driving of the tacks, a presser pad 145, Fig. 1, adjustably carried by an arm 2, is lowered on to the work in the region of the vamp ; the mechanism for lowering the pad includes a yielding element, but during the tacking operation the arm 2 is rigidly locked. After the wiping-in operation, and the lowering of the pad 145, the treadle 36 is automatically released by the cam 72 so that the pincers release the upper, after which the tacks are driven by drivers 134 mounted on bars 173 connected to a bracket 175 ; this bracket is actuated in the one direction by a spring-pressed arm 176, and in the reverse direction by a cam. After the tacking operation, the various mechanisms are returned to their original positions.