US228183A - Skiving-machine - Google Patents

Description

n asheetsK-sneen .1, W. S. FITZGERALD. Skiving-Maohine.-

10.228,183. Pate'nredJuneI, 1880.

Wir/'Messe 3.-. Imfezwf vN- Fm PHOTO-LIYHGGRAFHER. WASHINGTON. D C.

UNITLD STATES PATENT OFFICE.

VALTER S. FITZGERALD, OF BOSTON, MASSACHUSETTS.

SKIVING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 228,183, dated June 1, 1880,

` Application filed January 24, 1880.

To all whom it may concern:

Be it known that I, WALTER S. FITZGER- ALD, of Boston, county of Suffolk', State of Massachusetts, have invented an Improvement in Skiving-Machines, of which the following` description, in connection with the accompanying drawings, is a specification.

The invention relates to skiving-machines for skiving leather for the uppers and other parts of boots and shoes.

Heretofore such machines have been so constructed as to be almost useless for the skiving of the liner grades of leather, such as glove-calf, kid, Sac., on account of the extreme difficulty of feeding them to the knife without causing them to crease or pucker, and also on account of the carerequired to keep the knife sharp, it having been necessary in nearly all machines to remove the knife in order i to sharpen it.

The object of my invention is to provide a skiving-machine by which the lightest-grades of leather may be skived without creasing, puckering, or stretching the same, and in which the cutting-knife will be kept sharp without the use of complicated gearing.

Myinvention consists in the employment, in a skiving-machine, of a `rotatable table or support for the material, combined with apivoted bearing by which to incline the axis of the table more or yless from a vertical position with relation to the plane of movement of the skiving-knife, whereby the inclination or bevel formed at. the edge lof the material by the knife may be made more or less abrupt; also, in the combination, with the rotatable table and disk-knife and feeding stud or roller, of a guard to prevent the material being skived from overriding the disk-knife; also, in the combination, with the rotatable table and f'eed stud or roller, of a presser adapted to be pressed down upon the surface of the material, to produce pressure thereon outside of the serrated part of the feed-stud when it is desired to trim outwardly curved or convexed edges of pieces of leather; also, in the peculiar arrangement hereinafter described of pulleys and belts for connecting and operating the disk-knife and grinder. y

Figure l is a front-end View of a device embodying my invention. Fig. 2 is a side view of the same. Fig. 3 is a plan thereof, and Fig. 4 is a detail of the screW-shanked feedstud.

In the frame B, whose base A is secured by bolts or otherwise to a table or bench, is mounted the driven shaft C, suitably journaled in boxes or bearings D E, the bearing E being vertically adjust-able in the head F of the frame B by means of a screw,I G, and spiral spring g upon and in the top of the frame-head F, the stop-pin Hin the side thereof beneath the journal or bearing E, as shown in Fig. 2 of the drawings, determining its lowest position.

The bearing D (see dotted lines, Fig. 3) in the portion I of the frame B, through which the shaft C passes, is made externally like a double cone, and, supported at its central part only, is free to rock as the shaft C is adjusted by the screw G. The feeding stud or roller J is, as herein shown, screwed into the end of the shaft G, (see detail, Fig. 4,) and preferably forming part of this feed-stud are two smooth-surfaced wheels, J2 J2, to prevent the fingers of the operator from being cut by the disk-knife r.

At one side of the frame F, and secured to it by screw f', is a guard, f2, which is extended forward in the groove 3, under and between the wheels J 2, and under the edge of the disk-knife r, the said guide serving to prevent the material riding up over the said knife. Upon this frame F is secured by screw f a presser, f3, which is extended forward into the groove 4 at the outer end of the serrated part of the feed-stud, where the said presser just touches the upper surface of the material being skived, it being supported upon the table K.

When convexed or outwardly-curved edges are to be skived, and at no other time, this presser f3 is temporarily forced down, by hand or otherwise, upon the surface of the material, causing its edge to be forced against the edgegage M', located at the rear of the table K, and made adjustable by means of a screw, m', which holds the shank m of the gage, the latter being inserted in a suitable hole in the bearing L, pivoted at l', the said bearing L also serving to receive and hold the axis It of the table K.

The pivot Z. for the bearing L is extended through ears of a block, N, having a projection,

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2 QQSJSS while by the screw l2 the bearing L may be l held in any desired position, according to the inclination it is desired the axis 7c of the table to occupy, for the purpose hereinbefore described. A clearer, j, at the rear of the ser- V`-rated feed-stud acts to clear the grooves of the said stud from particles of leather.

In the drawings I have shown a presserplate, x, which, if desired, may be employed in front of the feed-stud to hold down the material. A frame, O, secured by means of a screw, o, to the head F, carries upon its face a supplementary frame, P, vertically adjustable by means of a set-screw, p, at the rear of the frame O. In one end of this frame Pis journaled the knife carrying shaft It, having at its lower end the circular knife r, which is vertically adjustable by means of a screwnut, S, at the upper end of the shaft. Upon the center of the shaftIt,between the bearings p p', is fixed a dri\f'ingpulley, T, about which passes the belt t, and thence around the'horizontal guide-pulleys b b upon the bracket U, the Lipper one of which is provided with a groove, b2, for the reception of the belt of the grinder-pulley y. The belt t then passes above the vertical guide-pulley V, and about the pulley W in front of the drivingpulley X on the shaft O.

The shaft y of the grinding-wheel Y has its bearin gs in part of the frameP, which supports the knife-shaft, and by means of the nut g3 on the shaft y it may be raised or lowered to remove the grinding-wheel from or place it so as to run in contact with and grind or sharpen the disk-cutter r. The shaft lyis set at an inclination to the shaft R of the disk-cutter, in

order that the under or beveled face of the emery or other grinding' wheel may properly bevel and sharpen the disk-knife.

A piece of leather to be skived,being` placed upon the rotatable table, will be operated upon by the serrated part of the feed stud or device, and'will be carried forward to the disk-knife, the acting' edge of which extends partially under the said feed-stud.

I claim- 1. In a skiving-niachine, a rotatable table or support for the material and a knife, combined with a pivoted bearing` to support the axis of the table and permit it to be adjusted more or less from a vertical position, substantially as described.

2. The rotatable table, disk-knife, and feeding stud or roller, combined with the guard extended under the disk-knife, as described, to prevent the material overriding,` it, substantially as set forth.

3. The rotatable table and feedstud 'and edge-gage M, combined with the presser f3, to operate when con vexed edges are being skived, substantially as described.

4. The disk-knife, its shaft, and means to adjust it vertically, and the rotatable feed-stud, combined with the rotatable table K, having` its axis set at an inclination to the axis of the disk-knife, substantially as described.

5. In a skivingI-machine, the driving-pulley W on the shaft C, the guide-pulley V, andthe pulleys b b', arranged with relation to each other as described, and the belts t y2, combined with the pulleys T and y of the'shafts R and y, substantially as described.

In testimony whereof I have signed myname to this specification in the presence of two subscribing witnesses.

WALTER S. FITZGERALD.

Witnesses:

G. W. GREGORY, L. F. CONNOR.

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