US714359A - Disk cutter. - Google Patents

Description

Patented Np-v. 25, I901.

y BROOKS.

DISK CUTTER.

(Application filed Apr. 7, i902.) (No Mbdel.)

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UNITED STATES PATENT OFFICE.

JOHN BROOKS, OF BROOKTON, MASSACHUSETTS.

DISK CUTTER.

SPECIFICATION forming part of Letters Patent N 0. 714,359, dated November 25, 1902.

Application filed April 7, 1902. Serial No. 101,799. (No model.)

To all whom it rnaly concern:

Be itknown that I, JOHN BROOKS, of Brockton, in the county of Plymouth and State of Massachusettaihave invented certain new and useful Improvements in Disk Cutters, of which the following. is a specification.

This invention. relates to cutters such as those used in leather-skiving machines, and

particularly in the so -called Amazeen skiver, the cutter being a disk of metal flat on one side and beveled at its marginal portion on the other, the intersection of the fiat and beveled sides forming a circular cutting edge. continuous-that is to say, forming an uninterrupted circle around the entire periphery of the disk. It has been found that a continuous cutting edge leaves something to be desired in point of rapidity of operation, the cutting action being undesirably'slow. It has been proposed to remedy this objection ,by forming radial grooves or corrugations in the flat side of the cutter, the corrugations extending to and through the cutting edge and interrupting its continuity, leaving said edge somewhat serrated. While this formation increases the rapidity of the cutting action, it causes a further objection-namely, creation of dust, its action being to tear or rake from the material a large number of small particles, which are scattered by the ro- 'tation of the cutter.

My invention has for its object to overcome each of the objections above referred to; and to this end it consists in a disk cutter having in its flat side a series of grooves which are tangentially arranged--that is to say, at a tangent to a circle within the periphery of the cutter-said grooves extending to and through the cutting edge and interrupting the continuity of the latter, the angle at which the outer portions of the grooves therevention.

Fig. 4 represents an enlarged side view of a This cutting edge has usually been section on line 5 5 of Fig. 4.

The same reference characters indicate the same parts in all the figures.

In the drawings, a represents a disk cutter, which is substantially fiat on one side and is beveled at the marginal portion of its opposite side, the beveled portion intersecting the fiat side and forming a circular cutting edge, this being the ordinary-form of disk cutter employed in an Amazeenskiving-machine.

In carrying out my invention I form in the flat side of the cutter a series of shallow and narrow grooves b, which are arranged tangentially with relation to an imaginary circle withinand concentric with the circular cutting edge of the cutter. These grooves extend to and through the cutting edge andare of such depth that they do not extend through the body or thicker portion of the cutter, but only through the cutting edge and the reduced portion immediately adjacent thereto, as indicated in Figs. 4 and 5. The grooves interrupt the continuity of the cutting edges sufficiently to increase the rapidity of the cutting action, their tangential arrangement enabling one side of each groove to form an acute angle 2 and the other side an obtuse angle 3 relatively to the periphery of the cutter. When the cutter is in operation, it is rotated in the direction indicated by the arrows, the direction being such that the acute angles 2 follow, while the obtuse angles 3 lead, the adjacent parts ofithe cutting edge.

This arrangement prevents any liability of I prefer to provide the cutter with circular orifices o c at the inner ends of the grooves b, said orifices extending through the body of the cutter and serving to prevent cracks which may form in the cutter extending along the grooves b from continuing inwardly from the said orifices. I have found that the orifices formed and arranged as shown effectually prevent the inward extension of any cracks that may develop along the grooves b.

In practice the side which I have hereinbefore referred to as the flat side is slightly concave, the degree of concavity being so slight, however, that it is hardly perceptible.

I claim 1. A disk cutter having at one side a beveled marginal portion intersecting the opposite side to form a circular cutting edge, and a series of grooves formed in the opposite side and extending to the cutting edge, the depth of the grooves being less than the thickness of the cutter, excepting at the marginal portion thereof, so that the outer portions of the grooves extend through the cutter and form slots interrupting the continuity of the cutting edge, the continuity of the beveled portion Within said slots being uninterrupted.

2. A disk cutter having a beveled marginal portion on one side forming a cutting edge, and a series of tangential grooves formed in the opposite side, said grooves extending to the cutting edge and interrupting the continuity of the same, the cutter having a series of orifices communicating with the inner ends of the grooves.

In testimony whereof I have affixed my signature in presence of two Witnesses.

JOHN BROOKS.

Witnesses:

O. F. BROWN, E. BATOHELDER.

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