Patent GB-191103958-A (GB)
Title: Improvements in or relating to Pulling-over or like Machines for use in the Manufacture of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
IPC: A43D13/00
Filed: 1911-02-16
Granted: 1912-02-16
Abstract: 3958. Boult, A. J., [United Shoe Machinery Co.]. Feb. 16. Lasting. - To lessen the waste of upper material, a pulling-over or like machine of the type described in Specification 7005/00 is arranged so that the pulling movement occurs in two steps, during the first of which the toe and side grippers, preferably actuated independently, apply a pre-determined tensioning to the upper to draw it down to the last and to straighten it, while during the second step the grippers are actuated by power to stretch the upper a measured distance, which is determined and controlled by the first part of the pulling movement. For this purpose, the gripper - actuating levers are formed in two sections 10, 12, Fig. 1, adapted to be connected together by sliding latches 25, which are adapted to be actuated by a rod 40 connected to a foot treadle 26; the toe-gripper latch may, however, be withdrawn independently of the side gripper latches by means of a push-bar 27. Between the sections 10, 12 are arranged springs 28, which, after the grippers have been closed on to the upper and before the power operation begins, actuate the sections 10 independently of the sections 12 to uplift the grippers. This straightens the upper, and enables the operator to make the necessary adjustments to position it properly on the last while it is held with a light tension. During this movement, an adjustable collar 411 on the treadle rod 40 releases a latch 42, and allows a spring 44 to act through a rack 41, toothed shaft 43, and rack-slides 45 to advance the heel-rest into engagement with the shoe. A swivelled yoke 60, Figs. 1 and 2, rests adjustably on the front ends of the sections 10, and during the upperstraightening movement above described, the yoke acts through an arm 62, rock-shaft 63, and a toothed arm 64 on a slide 65, which is moved transversely of the machine in inclined guideways in the machine frame, and is consequently adjusted upwards in proportion to the amount of movement of the grippers; a spring pawl 70 locks the slide in its adjusted position. The slide is arranged over adjustable stops 68 projecting from the sections 10; during the power operation of the machine, the sections 12 first pick up the sections 10, and then the two move together until arrested by the abutment of the stops 68 against the slide 65. In this way, the upper is stretched to a predetermined extent, which is automatically determined during the initial upper-straightening movement. During the power operation of the machine, a cam-actuated slide 86, Fig. 4, acting through a spring plunger 89 on a block 90 adjustably mounted on a hand lever 91 of a shaft 92, causes the shaft to actuate rack-blocks 94 connected to. the side grippers, so that these grippers are moved forwards to effect a forward drafting of the upper. The gripperspreading mechanism comprises an adjustable wedge block 125, Fig. 7, carried upon a slide 116 and adapted to engage swivel blocks on the front ends of gripper-positioning levers 124; springs 122 hold the side grippers against these blocks, and also hold the toe gripper against a roll on the front end of the slide 116. This slide is actuated through a second slide 115 and rack &c. gearing from a shaft 114, Fig. 8, which is oscillated from the main cam-shaft. The slide 115 is geared through segments 130 to rack-bars 132, which carry yielding plungers 134 having bevelled ends in engagement with slide blocks 135. These blocks have a ball-and-socket connexion with the side tacker arms, so that the arms are caused to follow the grippers inwards until they meet the shoe. The positioning- levers 124 of the side grippers are pivoted on a slide 150, Fig. 7, which can be adjusted by a hand lever 155 simultaneously to move the levers and consequently the side grippers transversely of the machine, to position them for operating on shoes made on right or left crooked lasts. For the same purpose, the side tackers are provided with an equalizing-connexion comprising a pinion 160 and double-faced rack-bars 162 arranged between the segments 130, Fig. 8. This enables a dwell to occur in the closing movement of the side tacker which first meets the last, and accelerates the other tacker until they are both in contact with the shoe, whereupon the drivers are simultaneously released and the tacks driven. The machine may be fitted with an end-lasting mechanism as described in Specification 9793/08.