Patent GB-190813052-A (GB)
Title: Improvements in or relating to Machines for Operating upon the Soles of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
Filed: 1908-06-18
Granted: 1909-09-20
Abstract: 13,052. Boult, A. J., [United Shoe Machinery Co.]. June 18. Cutting-machines for leather &c.-A machine for channelling &c. insoles comprises, in combination, a feather-edge-forming knife and a channelling- knife, and means whereby the knives and associated presser-gauges acting on the face of the insole are reciprocated to feed the work, the cutting taking place on the backward stroke. A work retainer holds the work during cutting. A chamfer knife, moving with the edge and channel knives, may also be added to bevel the unlipped surface of the insole. The work-support may be rotatable in the direction of feed, and is preferably locked against movement during the cutting-stroke. The machine may comprise means for reducing the length of the feeding-stroke to zero at the will of the operator. The channel knife 70, Fig. 8, and a channel-knife presser-gauge 72 are adjustably supported in a channel-knife carrier 68, secured to a bracket projecting from a channel-knife slide 36. The edge knife 76 and edge-knife presser-gauge 78 are adjustably supported in a bracket projecting from an edge-knife slide 38. The channel and edge-knife slides 36, 38 are mounted for vertical movement in a carrier 34, Fig. 9. They are adjustably supported by screws 40 carrying nuts which rest upon the transversely-arranged ribs 46 of the carrier 34, Fig. 8. Adjustable coil springs 52, 54, Fig. 3, produce a constant yielding downward thrust upon the slides 36, 38. The carrier 34 is pivoted in cone bearings 132 in the machine head, and is reciprocated in the direction of feed by means driven from the machine shaft 30, Fig. 9. This shaft carries a disk having a cam-groove 134, into which projects a roll on a lever 138. This lever operates a slotted crank-arm 144 through a rock-shaft 140. A link 148, Fig. 3, connects a pin on the carrier 34 to an adjustable block 152 sliding in the slotted crank-arm, and conveys reciprocating motion to the carrier. A work-retaining foot 198 on a spring-pressed rod 190, mounted in guides on a vertical slide 184, is pressed upon the work during the cutting-stroke by means of a crank-pin 202, Fig. 9, in the end of the shaft 30 and an horizontal groove in the back of the slide 184. An edge gauge 210, Fig. 8, is mounted for adjustment transversely of the line of feed on a slide 218, which is movable parallel to the line of feed in ways on an in-and-out slide 212. A chamfer knife 228 is adjustably clamped to the edge-gauge slide 218 by a screw 234. In order to provide a bearing for the insole edge throughout the feeding and cutting strokes, to facilitate the guiding of the work, the edge gauge and the chamfer knife are arranged to move with the edge and channel knives. To communicate the feed-motion to the edge gauge and chamfer knife, a pin 224, engaging a vertical recess in the carrier 34, encircles a rod 222 transversely arranged in the edge-gauge slide 218. The length of the feeding-stroke may be reduced at the will of the operator, to facilitate work on razor-toe and like insoles, by means which vary the position of the block 152 in the crankarm 144. A spring 172 co-operating with an adjustable stop 176 tends to maintain a given high rate of speed. As shown in Fig. 3, a treadleoperated rod 164 rocks an arm 156 attached to a link 154 connected to the block 152. This action stretches the spring 172 and shortens the effective length of the crank-arm 144. The range of speed may be varied by adjustable stops 176, 178. In a modification shown in Fig. 18 the feeding-stroke can be nullified, the slotted crank - arm being arranged to allow the pin on the block 152 to be placed coincident with the axis of the rock-shaft 140. Fig. 16 shows a work-table 120 arranged to rotate with the feed of the work. A ball 314 is arranged within a recess 310 beneath the worktable. An adjustable retaining-plate 312, having an inclined face 316, coacts with the hub of the table to wedge the ball and lock the table against backward movement. A spring 318 controls the ball. Fig. 14 shows a section of an insole with the cutters, presser-gauges, and work-retainer in operation. The work-retaining foot 198 is adjustable in the direction of feed, and its toe 206 is maintained in adjustment just behind the position of the cutting-edges of the knives at the completion of the cutting-stroke. The contracting faces of the presser-gauges 72, 78 are backed, as at 182, Fig. 15, in order to assist the feeding of the work, and the heel of the edge-knife presser-gauge is rounded as at 288, Fig. 15. These arrangements facilitate the action of the tools in running on and off the insole when executing razor-toe work. The bevelling knife is adjusted to project above the work-support at an angle of 45 degrees with its back close against the edge gauge to obviate false cutting around the curve. The feather edgeforming knife may he an edge-slitting knife as shown in Fig. 14. The edge and channel knife presser-gauges are each capable of vertical adjustment relatively to the tools. The work-support is mounted and operated, and the edge gauge is operated transversely of the line of feed, in the manner described in Specification No. 25,730, A.D. 1906, [Abridgment Class Boots &c.]. The path of movement of the work-retaining foot 198 may be adjusted by means of nuts 196, and its pressure is governed by adjustable collars 192. The edge and channel knives may be raised from the work independently or conjointly, and the speed-controlling treadle is arranged to project across the treadle that depresses the worktable and raises the knives. Depression of the former treadle first reduces the speed of feed to a minimum, then stretches a spring, and finally operates the second treadle to lower the worksupport and lift the knives. The work-retaining foot acts to strip the work from the knives in this last operation.