US2290994A - Skiving machine - Google Patents

Description

July 28, 1942. E, Y 2,290,994

SKIVING MACHINE F iled Feb. 21, 1941 Patented July 28, 1942 UNITED STATESPATENT OFFICE v 2,290,994 SKIVING MACHINE Eugene J. Ray, Beverly, Mass, assignor to United Shoe Machinery Corporation, Flemington, N. J a corporation of New Jersey I Application February 21, 1941, Serial No. 380,027

3 Claims.

This invention relates to skiving machines and is herein illustrated as embodied in a machine for skiving the margin of sheet material such, for example, as parts of boots and shoes.

A machine in common use comprises a tubu-' lar knife, a feed-roll located partly within the knife, a presser for holding the work against the roll, and a throat-plate the forward end of which overhangs a portion of the roll. The feed-roll is convex lengthwise to correspond to the curvature of the knife and the surface of the throatplate is also convex, the work being fed over the throat-plate and the roll to the knife, an edge-guide being provided which is adjustable crosswise of the machine on the throat-plate, said guide being comparatively wide and adapted to contact with a considerable length of the edge of the Work. Such a machine is adapted particularly to the skiving of the margins of comparatively thick pieces of sheet material, the edges of which are straight or only slightly curved.

In order to adapt such a machine for skiving the margins of pieces of work the edges of which are more abruptly curved, there is provided, according to the present invention, a comparatively narrow edge-guide having projecting from its work-engaging end a thin shelf over which the margin of the work is fed, and means for mounting the guide in such manner that it may be adjusted crosswise of the machine and at the same time its end remote from the work-engaging end may be adjusted vertically so as to maintain the edge of the shelf in contact with the convex surface of the throat-plate in any crosswise position into which the guide may be adjusted. By maintaining the thin edge of the shelf in contact with the throat-plate, all liability of the margin of the work getting beneath the guide is obviated; and because the guiding face is comparatively narrow. considered in the direction of feed movement of the work, the edges of pieces of work which are considerably curved may readily be skived.

This and other features of the invention, including certain details of construction and combinations of parts, will be set forth as embodied in an illustrated machine.

Referring to the accompanying drawing,

Fig. 1 is a side elevation of a portionof a machine in which the present invention is embodied; and

Fig. 2 is a view looking down upon a portion of the machine, all of the presser and its carrier having been omitted except the stem of the carrier which is shown in cross-section, a piece of work being shown in process of having its margin skived.

The machine comprises a rotary tubular knife 3, a rotary feed-roll 5 which is convex lengthwise and is located partly within the knife, an angularly adjustable presser 1, a presser carrier in the form of a block 9 on the lower end of a stem II, and a throat-plate 13 the surface of which is convex crosswise of the machine to correspond substantially to the convexity of the feed roll and the knife. The work is fed (away from the observer as viewed in Fig. 1 or to the right as viewed in Fig. 2) over the throat-plate and roll to the knife. As thus far described, the machine is like that shown in United States Letters Patent No. 1,688,434, granted October 23, 1928, upon an application filed in my name, except that in the patented machine an angularly adjustable driven presser-roll is shown in place of the presser of the illustrated machine. However, the particular construction of the presser and its mounting form no part of the present invention.

In order to adapt a machine of this general type to skiving the margins of pieces of work such as a quarter I00 whose edges are more or less abruptly curved, there is provided an edge guide comprising a thin bar the greater part of which extends crosswise of the machine. The work-engaging end of this bar is curved until it extends approximately in the direction of feed movement of the work; and projecting from the lower portion of this work-engaging end is a thin beveled shelf l1, the edge of which rests on the convex surface of the throat-plate l3, the workengaging end of the guide, including a part of the shelf, overhanging the feed-roll. The end of the edge-guide remote from its work-engaging end has a substantially horizontal slot in; and through this slot, as well as through a vertical slot 2| in a stationary upright bracket 23, passes a clamping means in the form of a bolt 25. A washer 21 and a nut 29 provide means for fastening the guide I5 in adjusted position.

The work I00 is guided by engagement of its edge with the upright face 3| of the guide I5, its margin passing over the beveled shelf H as shown in Fig. 2. The guide must of course be adjusted crosswise of the machine, and if this adjustment were in a straight horizontal path the edge at the curved extremity of the shelf I! would be held in contact with the convex surface of the throat-plate only when this edge was at the top of said convex surface. With the construction shown, however, in which the end of the guide remote from its work-engaging end may be adjusted vertically, it is possible to keep the thin edge of the shelf H in contact with the convex surface of the throat-plate in any position into which the guide may be adjusted. The work may thus be presented over the beveled shelf without any danger of getting beneath it and remains in contact with the comparatively narrow work-engaging face of the curved bar during the skiving operation.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A skiving machine having in combination a rotary tubular knife, a rotary feed roll located partly within the knife, a throat-plate the forward end of which overhangs a portion of the roll, said throat-plate having a surface which is convex crosswise of the machine, a presser for holding the work against the roll, an edge guide having projecting from its work-engaging end a thin shelf which rests upon the throat-plate and over which the margin of the work passes, and means whereby the guide may be adjusted crosswise of the machine and its end remote from its work-engaging end adjusted vertically.

2. A skiving machine having in combination a rotary tubular knife, a rotary feed roll located partly within the knife, a throat-plate the forward end of which overhangs a portion of the roll, the surface of said throat-plate being convex, a presser for holding the work against the roll, an edge guide having at its work-engaging end an upright wall against which the edge of the work is held and a shelf over which the margin of the work passes during the skiving of the work, said guide having at the end remote from its work-engaging end a slot, a stationary member having a slot at an angle to that in the guide, and means extending through the two slots to clamp the guide adjustably to the stationary member, whereby when the clamping means has been loosened and the guide is adjusted crosswise of the machine, the end of the guide remote from the work-engaging end may be raised or lowered as may be required to maintain the edge of the shelf in contact with the convex surface of the throat-plate.

3. A skiving machine having in combination a rotary tubular knife, a rotary feed-roll having a surface which is convex lengthwise of the roll, said roll being located partly within the knife, a throat-plate having a convex surface which corresponds approximately to that of the roll, the forward end of said plate overhanging a portion of the roll, a presser for holding the work against the roll, a work-engaging portion of the roll being exposed between the presser and the throat-plate, an edge guide the greater part of which is substantially parallel to the axis of the roll, the work-engaging end of said guide extending in the direction of feed movement of the work and having extending from its lower portion a beveled shelf over which the margin of the work is fed, the forward end of said shelf overhanging the roll, and means whereby the guide may be adjusted crosswise of the direction of feed movement of the work and its end remote from the work-engaging end adjusted vertically so as to maintain the edge of the beveled shelf at all times in contact with the convex surface of the throatplatei EUGENE J. RAY.

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