US276860A - Trimming attachment for sewing-machines - Google Patents

Description

(No Model.) l 2 Sheets-Sheet 1.

- G. M. MOB-ms.

TRIMMING ATTACHMENT POR'SEWING MA'GHINESL No. 276,860.

Patented May 1, 1883.

Witness c: Q Invento r:

(No Model.) 2Sheets-Sheet 2;

G. M. MORRIS; T'RIMMING ATTACHMENT FOR SEWING MACHINES. No. 276,860. Patented May 1,1883.

= Fig.8.

Wifnesses: 1 5

' .UNITED STATES PATENT @rrrcn GEORGE M. MORRIS, OF GOHOES, ASSIGNOR OF ONE-HALF TO WILLIAM I. BLEAKLEY, OF LANSINGBURG, NEW YORK.

TRIMMING ATTACHMENT l-"OR SEWING -MACHINES.

SPECIFICATION forming part of Letters Patent No. 276,860,...dated May 1, 1883. Application filed November 13, 1882. (No model.)

To all whom it mag concern:

Be it known that I, GEORGE MARION Moa- RIS, of the city of Oohoes, county of Albany, and State of New York, have invented a new and useful Improvement in Attachments to Sewing-Machines for Trimming Fabrics, of

which the following is a specification.

' My in ventioh relates to that class of devices adapted to be attached to sewin g-machines for trimming the edges of fabric that is being sewed. The older methods generally in use for accomplishing this result consisted of a movable sheanblade edge that opened and closed intermittently along the cutting-edge of a plate; but this manner of trimming, and as well that done by two cutting shear-edges acting from the same pivotal center of motion, is objectionable when used in connection with a sewing-machine, from the fact that as the shear-edges close to cut or trim they exert a tendency also to force the material ahead of and from the outwardly-moving cutting-point of theclosing blade or blades. This latter difficulty occurs more particularly where these older methods are used to trim the edges of loosely-knit fabric and'elastic goods.

I am well aware that the lapping end faces of two rollers actuatedfrom separate centers with continuous rotation have been used to cut rags and'carpets; but asa continuous rotation and the shear engagement of two convex cutting-edges so actuated have a constant tendency to draw in the fabric such a method of cutting could not be adapted to trim the fabric being sewed in a sewing-machine, as it would seriously interfere with the feed-motion and the relation the formation of stitches by the needle has to do with the latter.

To adapt two cutters that are operated from two centers of motion to trim the fabric being fed into a sewing-machine is the object of my invention, and this I accomplish by constructing and arranging, as will hereinafter be described, two disk-cutters that are upon separate shafts having a geared connection, and with the disk-cutters upon their lapping shearcdges constructed to have areci procatin g shear. motion, by which they open to receive and close to cut the fabric being fed into the sewing means of the gears G G machine. The two combined convex cutting- 0 edges of the older device being dispensed with, and although one reciprocatingly-rotated edge with a convex face may be used to make it operative, it must be combined with a definite cutting-edge or a concave cutting-edge cut 5 from the perimeter of the opposite disk, as shown in the annexed drawings.

I am alsowell aware that a disk having interchangeable cutting-faces has been combined with a fixed shear engaging blade-edge, said disk having a pivotal center for attachment and motion, and that my invention, so far as relates to a cutting-disk having interchangeable cutting-faces, is limited to the manner in which I employ it.

Accompanying this specification, and forming a part of it, are two plates of drawings containing eight figures illustrating my invention, and in all of which the same designation of parts by letter-reference is used.

Figure 1 shows in perspective my device removed from its connection with a sewing-machine; and Fig. 2 a vertical section of it, taken on the line as m of Fig. 1. Figs. 3, 4, 5, 6, and 7illustrate the manner of forming the cutting edges upon the perimeters of the disks; and Fig. 8 illustrates the position of the device when attached to a sewing-machine.

The parts of the device are designated by letter-reference, and their function described, as follows:

Theletters Aand A indicate two disks, upon the perimeters of, which, at 0 0 are formed cutting-faces or blade-edges. These disks are arranged on the ends of the shafts S S which have their bearings at B B in the support L, and are connected for simultaneous motion by The side surfaces of the cutters A and A on their cutting-edges are in lapping contact, as indicated at a a. 0

The letter D indicates an arm or crank attached to one of the shafts, and which is constructed to be reciprocated in the direction shown by the dotted line 01, so as to reciprocatingly rotate the two shafts simultaneously 5 by means of their geared connection, and thus operate the cutters.

V The letter T designates a set-screw that works in the plate B and against the end of the shaft S to keep the lapping edges of the cutters in shear contact.

The letter M indicates a sewing-machine needle-arm; P, a sewing-machine-table plate; N, the needle-bar; and N theneedle; H, the sewing-machine shaft; W, a cam-wheel on the latter, having a camgroove in its side face to engage with a pin upon the end of the arm D to reciprocate the latter and the rotation of the shafts and cutters.

At Fig. 8 the trimming attachment is shown as applied to a sewing-machine with the cutters at right angles to the table-plate, and arranged so as to cut or trim in the direction of the feed.

The perimeters of both the disks, where formed with cutting shear-edges, may be made to curve inwardly, as shown at Fig. 5 5 or both of them may be made straight, as shown at Fig. 3, or with one straight cutting-edge and one inwardly-curved cutting-edge, as indicated at Fig. 4, or with one of the disk cutting edges circular and the other constructed with a straight cutting-edge on its perimeter, as indicated at Fig. 6, or with one of the disk cutting-edges in circular form and that of the other as curved inwardly on the perimeter, as shown at Fig. 7. As these disk-edges are thus constructed they cut in the same manner and by the operation of the same factors, and either may he used.

If desired, the gears G and G2 may be of different diameters, so as to cause one of the attached shafts and actuated cutters to move more rapidly than the other, and without materially changing the operation of the factors employed. a

The letters T T designate two set-screws, one of which is used to attach one of the cuttets to each of theshafts, and adapted to secure the disks at interchangeable places, so that when portions of the cutting-edges become dull from use they may be moved around and others brought into position. While I have 5 shown the disks as constructed with interchangeable cutting-edges, as but one cuttingedge upon each is used during the operation, the production of a series of them is not an indispensable part of my invention. If desired, the cutting-edges may be formed upon the radiately-cut part of a disk, as indicated by dotted lines at m m m m, and used without the rest of the disk.

To operate the cutters it is essential that they shall be actuated to reciprocatingly rotate from two separate centers of motion, and, as shown herein, this is accomplished by actuating the arm D to reciprocate in the line of motion indicated by the dotted line d. To

' move the latter any of the well-known means for thus reciprocating it may be used, that which I have illustrated being a cam-groovc in the side face of the wheel W on the sewingmachine shaft, and apiu on the end of arm D, 6 adapted to move in said cam-groove.

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

In a trimming attachment for a sewing-ma- 7o chine, lapping-disks A A with definitelyformed cutting-edges in la pping-shear engagement, a shaft for each disk, gears connecting the shafts, one of said shafts being provided with a crank and an offset crank-pin, in combination with a grooved wheel suitably arranged upon a sewing-machine shaft to operate the connected parts in the manner specitied.

Signed at Troy, NewYork, this 9th day of November, 1882.

GEORGE MARION-MORRIS.

Witnesses:

HORACE L. HICKS,

HARLES S. BRINTNALL.

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