Patent GB-191223685-A (GB)
Title: Improvements in or relating to Machines for Shaping the Heel Ends of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
IPC: A43D8/04
Filed: 1912-10-16
Granted: 1913-12-16
Abstract: 23,685. Boult, A. J., [United Shoe Machinery Co.]. Oct. 16. Uppers, machines for; lasting. - A machine for shaping the heel end of a boot or shoe by means of an inside and an outer former is provided with means adapted to grip the upper and, in the movement of the formers towards each other, to draw the upper over the inside former. The inside former is mounted on a plunger 46, which is adapted to reciprocate vertically in a jack-post 40 movable alter. nately from shoe - receiving position into the shoe-shaping mechanism and back to shoereceiving position by a cam - operated lever. The vertical reciprocation of the plunger 46 is brought about by the straightening of a toggle, which, when the jack-post is in the shaping- mechanism, causes a thrust-pin to bear on the lower end of the plunger. The plunger 46 is in two parts separated by a spring 58, so that a yielding upward pressure is applied to the inside former. The inside former 60 corresponds approximately in shape to the rear end of a last, but is preferably made slightly narrower and with exaggerated curves for the purpose of overmonlding the work. The inside former co-operates with corresponding outer jaws 70, Fig. 6, which are loosely connected to backing- plates 72 by pins 73 passing into large holes in the plates 72. Stiff springs 75 are interposed between the jaws and the plates to permit the jaws to adapt themselves to variations in the thickness of the stock or in the size of the inside former. The backing - plates have arcshaped guide-ribs standing in a circular groove in the head 12, and are actuated to close upon a shoe on the inside former by links 78 connecting them with the cross - head 79 of the thrust-pin 80 of a cam-operated toggle 81. The toggle has an adjustable abutment through which the spread of the jaws can be varied. Seat wipers of the type described in Specification 13,947/12 are provided to wipe the flange of the upper materials inwardly upon the top face of the inside former. Short tack-drivers 120 are mounted in the inside former, to insert tacks through the overwiped margin of the upper into a connecting-strip of material for holding the two sides of the upper from spreading after the work is removed from the machine. The drivers are operated from rods 128 mounted on a collar 130 on the lower part of the plunger 46, through short rods 122 and series of balls 125 moving in curved passages near the sides of the inside former. The tacks are driven when the spring 58 yields. A band 102, for clamping the leg part of the boot against the jack-post, is pressed forward at the middle by a spring pin 105, but at the sides the band is normally held back by links. When the jack - post is moved into the machine, the middle part of the band is pressed back and the ends close round and clamp the upper against the jackpost. A further clamping-action is given to the band by the forward movement of a slide 110, which bears against a thimble sleeve 106 containing a spring 108 bearing against the block 103 that supports the spring plunger 105. After the leg band has been operated, the slide block 110, through a lost - motion connexion, operates a plunger 101. which carries neck crimping jaws 100 to give an inwardly directed crimp to the neck of the boot. A gripper for stretching the upper forwardly is mounted on a carrier 135, Fig. 7, which is connected loosely to a rockshaft 96, and the vertical position of which is determined by a stop 136. A carrier-rod 138 projects forwardly, being encircled by a spring 140 and a sleeve 142, upon which sleeve a gripper block 144 is adjustable for the length of the shoe. The lower jaw 146 is pivotally mounted and has a rear arm to which closing movement is yieldingly imparted through a spring 148 by connexions comprising a rod 150, and a rocker 152 splined on a shaft 154 having a rigid arm 155 joined by a link 156 to a connexion with a cam 160. The rocker 152 has a second arm 162 connected by a link 164 with a swinging pawl 165, which it lifts into engagement with ratchet teeth on the lower side of the sleeve 142 when the gripper jaws are closed. The forepart of the upper is thus gripped while the shoe is drawn into the machine. Electric heating- devices are fitted to the inside and the outside formers. The inside former may be provided on its top face with deflecting-plates 180 located at a distance from the edge of the former corresponding with the width of the feather of the innersole with which the upper is to be assembled. These plates are preferably undercut, and correspondingly-shaped wipers are used. By these means, the marginal portions of the upper are moulded with an upstanding lip to fit against the rib of the innersole. The machine has four jacks for dealing with four uppers; and the depression of a treadle to cause the insertion of one jack into the shaping-mechanism releases the jack that has been longest under pressure.