Patent GB-190724884-A (GB)
Title: Improvements in or relating to Machines for Preparing Welts.
Inventor: BOULT ALFRED JULIUS
Filed: 1907-11-09
Granted: 1908-11-09
Abstract: 24,884. Boult, A. J., [United Shoe Machinery Co.]. Nov. 9. Cutting - machines for leather &c.-Relates to machines for grooving, bevelling, and slashing welts, and comprises improved bevelling and grooving knives and a method of mounting these knives and mechanism whereby the operator can by a single operation raise a presserfoot, separate the feedrolls, and retract a spring-pressed side-guide. Figs. 1, 2, and 3 show a machine embodying such bevelling and grooving knives. The welt strip is fed, with the face downwards that is to be uppermost in the shoe, along a base-plate 1 between a guiding-flange 2 and an adjustable guide 3, and is held by a presser-foot 4 secured to a vertical slide 5. This slide is held down by a spring 8, against which it may be raised by means of a lever 11 pivoted at 10 to the slide and having a cam-surface bearing on a fixed support 9. The grooving knife 12, Fig. 6, is curved and extends round the periphery of a notched disk 13. The knife 12 is mounted on the side 5 so that the groove will be of uniform depth, and is so mounted that it may be adjusted to vary the depth of the groove. The grooving-knife is also capable of lateral adjustment to vary the distance of the groove from the edge of the welt, and of independent rotary adjustment. The bevelling-knife 21, Fig. 3, consists of a flat disk cut away to provide a radial cutting-edge 22 ; rotary adjustment is obtained by means of a stud held in a split clamp 23, forming part of a block 25 mounted upon a block 26 so that the angle of the bevel produced may be adjusted. To vary the depth of the cut produced by the knife 21, the block 26 is adjustable horizontally by means of a screw 27<a>, Fig. 2. The welt-slashing knife 29, Fig. 1, is carried by a bent lever 30, oscillated about a pivot 31 by means of an eccentric strap and link 33 connected to an eccentric on the main driving-shaft 32. The welt strip is drawn forward continuously by means of a power-driven feed-roll 34, and a pressure-roll 35, which may be loosely mounted and actuated by a coiled spring 38. Figs. 7 and 10 show a modified construction without a welt-slashing knife, in which means are provided whereby the operator can by a single operation raise the presser-foot, separate the feed-rolls, and retract the side-guide. The grooving-knife 12 is mounted directly in the lower end of the slide 5, and the block 25<1> carrying the bevelling-knife 21 is arranged below the welt. The depth of the groove formed is regulated by adjusting the presser-foot 4 vertically on the slide 5 by means of an adjusting- screw 45, and the depth of the cut made by the bevelling-knife 21 is varied by adjusting the block 25<1> vertically instead of horizontally. A small removable plate 48 replaces the base-plate 1, and the inner edge guide 49 is pressed by a spring 51 towards a flange 48 x on the plate 48. The presserfoot slide 5 is acted on by a coiled spring 52, and is raised, to permit a welt strip to be placed in the machine, by means of a lever 55, connected by means of a rod 56 to a treadle. To enable the feed-rolls to be separated at the same time, the rod 56 passes through the lever 57 in which the lower feed-roll is mounted, and carries adjustable nuts 58, which depress the lever 57 and so separate the feed-rolls. The edge guide 49, is also retracted at the same time, by means of a projection 59 on the slide 5 which, when the slide is raised, engages with a projection 60<x> on a pivoted lever 60, causing this lever to push the edge guide 49 against the spring 51. Guides 62, 63 engage the strips of material removed by the grooving and bevelling knives respectively, and direct them away from the welt strip.