US907618A - Trimming-cutter for sewing-machines. - Google Patents

Description

J.M. MERROW. TBIMMING CUTTER FOR SEWING MACHINES.

ARPLIOATIQN FILED 1320.9,1905,

907,618. Patented Dec. 22,1908.

WI-messesa/ INVENTEIR o' I J W BY W . TTUENEYE- UNITED STATES PATENT OFFICE.

JOSEPH M. MERROW, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE MERROW MACHINE COMPANY, OF HARTFORD, CONNECTICUT,

A CORPORATION OF CONNECTICUT.

TRIMMING-CUTTER FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Dec. 22. 1908.

Application filed December 9, 1905. Serial No. 291,131.

To all whom it may concern:

Be it known that I, JOSEPH M. MERRow, a citizen of the United States, and a resident of the city and county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Trimming-Cutters for Sewing-Machines and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the letters and figures of reference marked thereon.

The cutter of the present invention is primarily designed for the trimming mechanism of sewing machines, the object being to provide an improved form of double ended, reversible cutter which may be sharpened at either end without changing the form of the suns.

In the accompanying drawings: Figure 1 is a side elevation of the cutter, mounted in a holder and shows also a portion of a carrier and of a companion cutter. Fig. 2 is a front elevation of the cutter and its holder showing also a portion of acompanion cutter. Fig. 8. is a front elevation of the cutter. Fig. 4 is a view of the cutter as seen from the left of Fig. 3. Fig. 5 is a view of the cutter as seen from the right of Fig. 3. Fig. 6 is a cross sectional view taken on the line 66 of Fig. 3.

Throughout the several figures of the drawings, like reference figures and letters indicate the same parts.

The letter A denotes the cutter, B the holder, C the clamp, D the carrier and E the com anion cutter.

T e cutter is preferably made from a bar of steel, rectangular in cross section and cut away or recessed on one of its faces from diametrically opposite corners to a point near the middle of its length to produce the two flanges a a, the end faces of which form the guides for the cutters as will be hereinafter explained. The efiect of such cutting away or recessing is to produce a third flange a extending along the sides of the bar parallel and coincident with its opposite edges for a distance from each end and crossing from one side or edge to the other about midway of the length of the bar as at c The flange a furnishes two cutting edges arranged in o posite directions one at each end as at a an a The flanges a a and a. form approximately a right angle in cross section and both are cut across in a single plane at each end the planes of the faces of the two ends preferably being parallel.

The cutter can thus be sharpened at both ends by grinding the end faces entirely across both flanges in a single plane without changing the form of the ends and each of the said faces will have a cutting edge and a guide. The ends are preferably cut square with relation to one face of the bar as shown in Figs. 1, 4 and 5 and at such an angle with one of the adjacent faces of the said bar as to produce an acute cutting edge on the flange at the side adjacent to the recess at each end as shown in Figs. 2 and 3.

. The cutter is preferably secured in its holder by the clamp C and screw C and the holder B may be held in a carrier D which is adapted to be reciprocated by any convenient and suitable known means.

In operation, the cutter A is intended to cooperate with a companion cutter E, and the face of the flange forming the guard is designed to be always in contact with the side of the companion cutter E to prevent the cutting edges of the two cutters from undue conflict, as is common in trimming mechanism and shown in Figs. 1 and 2. It will be understood that the plane of the face of the acting end of the cutter A should be substantially in the plane of the side of the companion cutter E and that the path of movement of the cutter A should be practically parallel to the same plane.

Under the above conditions, the cutter A when worn or dull at one end, may be reversed or turned end for end in its holder and used again.

The improved cutter is well adapted for use in sewing machines for trimming off the edges of the material.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. As a new article of manufacture, a trimming cutter formed with a flange at one side extending parallel and coincident with one edge at one end and parallel and coincident with the opposite edge at the other end and extending across from one edge to the other at a point intermediate the two ends, whereby a cutting edge and a guard for the same are provided at each end of the cutter; substantially as described.

2. A trimming cutter of bar form ground or dressed at its two ends in substantially parallel lanes at an acute angle to the major axis of t e bar, each plane inc uding a cutting edge and a guide therefor, and the said cutter being reversible that either of its cutting edges may be utilized; substantially as described.

8. A trimming knife of bar form, each of the end portions of which are substantially I right angular in cross section to provide a 10 cutter and a guide therefor at each end, said right angular portions of the bar at 0 posite ends being inverted relatively to eac other and the end faces being ground or made each, in a single plane to include both the cutting edge and the guide; substantially as 15 shown and described.

JOSEPH M. MERROW'. Witnesses:

ALoNzo M. LUTHER, i W. O. W. STEWART.

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