Patent GB-190925240-A (GB)
Title: Improvements in or relating to Edge trimming or Shoe-sole Finishing Machines.
Inventor: BOULT ALFRED JULIUS
IPC: A43D87/00
Filed: 1909-11-02
Granted: 1910-12-01
Abstract: 25,240. Boult, A. J., [United Shoe Machinery Co.]. Nov. 2. [Cognate Application, 6280/10.] Trimming.-A machine for trimming the edge of a shoe sole adjacent to the heel breast comprises a knife moving along the sole to cut the edge to the breast, and a chopping knife which cuts into the sole in line with the breast. The trimming-knife 36, Figs. 3 and 7, is dovetailed and clamped in the forked end of an arm 34 depending from a rocker frame 18, Fig. 5, which is mounted on a spindle 16, Figs. 2 and 5, secured to an angle - plate 10 bolted to the machine-frame 2. This rocker frame is formed with two depending arms to receive a sliding block 22, Fig. 5, mounted on a stud 24 projecting eccentrically from the main shaft 6, Fig. 2. The knife 36, Fig. 7, is curved concentrically about the axis of oscillation of the frame 18, and its outer face is curved transversely to its path of travel to conform to the contour of the edge of the sole. Cutting-edges for the right and left sides of the shoe are formed on opposite sides of the knife, each edge also having a portion 37 designed to rand the upper edge of the welt. The cutting-edges are inclined to their paths of travel to conform with the line of intersection of the heel breast and sole edge. By forming the cutting-edge of the knife in line with its outer surface, the knife may be sharpened by grinding back to the outer surface, which shortens the knife, but does not otherwise change its dimensions. There are two chopping-knives 51, 52, one for each side of the shoe. They are mounted similarly to the trimming-knife in arms 43, 44, Fig. 1, pivoted at 41, 42 to arms 31, 32 projecting laterally from the rocker frame 18, and pivoted at their upper ends to links 45, 46 pivoted on studs 47, 48 secured in a stationary arm 12, Fig. 2, mounted on the horizontal portion of the angle-plate 10. The arrangement is such that, as the rocker frame oscillates to move the trimming-knife along the edge of the sole, each of the knives 51, 52 reciprocates in parallelism with itself across the edge of the sole, such movement alternating with that of the trimming - knife. The chopping - knives are arcshaped, and their edges are curved, as shown in Fig. 8, to co-operate properly with the trimming - knife, and to facilitate grinding. Adjustment to compensate for wear due to grinding is provided for by mounting the links 45, 46 on eccentric portions of the studs 47, 48, which are clamped in split portions of the arm 12. To protect the upper, and to aid in positioning the shoe, the machine is fitted with a guard 60, Figs. 1 and 3, which is provided with a lip 62 curved over the randing portion 37 of the knife 36 and adapted to enter the welt crease. A rotary rand trimmer 74, Fig. 2, of usual construction, is also provided for convenience in randing certain portions of the sole edge that cannot be reached by the knife 36, such as at the back of the heel breast. Instead of a double-edged knife, two independent right and left trimming-knives may be used.