US295896A - Trimming attachment for sewing-machines - Google Patents

Description

N0 Model.) Y

Y W. T. BTARDSLTL.` TRIMMTNG ATTACHMENT TOR SEWING 'MAGHINTS- Patented Apr. 1, 178811.

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the edges of both cutters.

A ilNiTEJD STATES PATENT Ormea. l

WILLIAM F. BEARDSLEE, OF BOSTON, MASSACHUSETTS.

`TRlll/HVIING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 295,896, dated April 1, 1884. Application filed September 17, 1883. (No model.)

To a-ZZ whom it may concern:

Beit known that I, WILLIAM F. `Bomans- LEE, of Boston, countyof Suffolk, Stateof Massachusetts, have invented an Improvement in Trimming Attachments for Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

' This invention has for its object the production of mechanism by which the edgesof knitted or other fabrics or leather may be trimmed, the said mechanism being preferably used in connection with sewing-machines of the wellknown Villcox 82; Gibbs class, or with other suitable sewing mechanism. i

In this invention I employ a cutting-disk carried bya sleeve, which surrounds and forms a bearing for the hook-shaft, and `in connection with the said disk I employ asecond disk located above it, their cutting-edges overlapping each other, the contiguous faces of the said disks being in substantially a `vertical plane, with their cutting-peripheries close to the needle, in order that the material being sewed may be trimmed parallel with the line of stitching. The disks as herein shown are adapted to be moved intermittingly and while thedmaterial is being fed or moved by the usual fee Figure 1 in elevation represents a portion of a Willcox 8L Gibbs sewing-machine with my trimming mechanism added; Fig. 2, a modification thereof. Fig. 3 is a section of Fig. l on the dotted line so @showing the usual clothplate and the position of the needle with relation to the cuttingpoint of the cutting-disks,- and Fig. 4 is a diagram in plan, representing the position of the two shafts of the two cutters with relation to each other and parts of A, needle-bar a, needle cloth-plate at are and The machine-head and the said machine in practice will be provided with the usual hook and with a suitable four-motioned feeding device and means to move it.

Ihe cutting-disk b, located below the clothplate, and having its periphery extended up- Ward above the level of the same, is connected with a sleeve, b', which is made to inclose the haokshaft a2, and also form aibearing for the latter, the shaft turning therein. The sleeve b takes a bearing in the upright part b2 of the frame A, and at its rear end the said sleeve is provided with a gear, b3, which, as shown in Fig. l, meshes with an intermediate, c, on a stud of ahanger, c', and the said intermediate is engaged by the gear c?, fast on the shaft c3, which has its bearings in a frame, d3 d4, substantially such as represented by like letters in my application No. 100,971.

A The shaft c3 has fast on it a bevel-gear, c4, which engages a bevel-gear, c5, and drives the short inclined shaft c, provided at its outer end with the upper cutting-disk, d, the edge of which overlaps the edge of the disk b, and, as'herein shown, at its front side.

The shaft c has on it a spring, d', and a nut, d2, which latter may be turned to compress the said spring and draw the cutting-disk d more or less closely against the cutting-disk b, thus keeping the two cutting-disks near their edges pressed together by a spring, which, as the cutting-disks are rotated, co-operate each to maintain sharp the edge of the other, thus avoiding frequent sharpening.

The hook-shaft a2 has upon it an ecc-entric, or it may be a cam, e, carrier, e', having a pawl, c2, which engages the ratchet e3 fast on and rotates the shaft c3 intermittingly, butat a different speed from that of the said rotating hook-shaft, the movement of the two disks positively-being at the time when the usual feeding device of the sewing-machine is operating to move the material for a new stitch.

In the modification, Fig. 2, thecuttingdisk d is attached directly to the prolonged end of the shaft c3, and the said shaft is provided with a spring, d, and nut d2, such as described in Fig. 1 in connection with shaft c6, and for the same purpose. i

In Fig. 2, where the upper disk, d, of the trimmer is placed directly on the shaft c, the gear c2 on the latter is adapted` to rotate the gear b3 and sleeve b and under cutter Z1 intermittingly. By employing gearsinstead of the single pawl and ratchet the disks may be rotated constantly.

I am aware that it is not new to employ a which strikes a pawl-,

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rotating eccentric or mutilated disk which cooperates with a slotted support or throat; and I ain also aware that two rotating disk-cutters have been employed to cut oval tips for hats;

5 and so, also, I am aware that oscillating many- 1.o disk isA substantially in the same plane as the edge of the said lower disk. The concavity in the disk and its inclined position are of especial advantage, as it forms a space for the reception of the needle-holding nut or end of I5 the needle-bar, thus permitting the fabric or material to be trimmed nearer the needle than of the said disks, substantially as described.

3. The rotating hook-shaft a2, provided with would otherwise be possible.

rPhe shaft c6 in Fig. 1 is shown as inclined downward and backward with relation to the shaft a2,- but, in addition to such inclination,

the shafts, which directly carry the cuttingdisks described, are so placed with relation to each other, or inclined, that their axes are not in the same vertical plane, so that the lapping edges of the disks bear against each other only at their point of contact, thus forming a relief back of the actual cutting-point. The rotating shaft ciz gives motion to the device below the cloth, which is to co-operate with the eyepointed needle in the formation of the stitch.

In order to bring the trimming mechanism very close to the line of the seam, and yet allow the usual Willcox St Gibbs hook to be employed, I have concaved the outer face of the under cutting-disk, b.

In this my apparatus the cutting-edges will preferably be set a little in advance of the stitching-point, but the material may be cut or trimmed exactly opposite the side of the 4o needle or a very little behind it; but in all cases the cutters in operation on a sewingmachine will cut the material substantially at the stitch forming point, which enables a curved or irregular shape to be trimmed substantially parallel with the seam, which is also curved and irregular; whereas if the disk-cutters were located several stitches back of the stitching-point only a straight edge could be trimmed.

I. In a sewing-machine, the upper rotating cutting-disk, d, combined with the cutting-diskv b, having its axis of rotation coincident with that of the shaft a? and turning on the said shaft, to operate substantially as described.

2. The rotating cutting-disk d and the disk b, having its axis of rotation coincident with that of the shaft a2, the said disks having their cutting-edges placed close to and substantially opposite the needle to trim the material substantially at thestitching-point, and means to connect and rotate the said disks in unison, combined with a suitable spring to hold the overlapping edges of the said disks together at their cutting-point to effect the sharpening an eccentric or cam, the shaft c3, a pawl and ratchet to actuate the said shaft intermittingly, and the upper rotating disk, d, moved intermittingly by the said shaft, substantially as described, but at a different speed, combined with the disk b, its/carrying-sleeve having its axis of rotation coincident with that of. and serving as a bearing for, the hook-shaft, and with means to actuate the said sleeve from the said shaft, to operate all as set forth.

4.. The needle and needle-bar of a sewingmachine combined with a trimming" mechanism having a disk, d, the face of which is concaved and set at an inclination to the line of reciproeation of the needle-bar and needle, substantially as described.

5. In a sewing-machine, the hook-shaft combined withthe sleeve b thereon,and its attached cutter b, having its outer face concaved for the reception of part of the hook, substantially as described.

In testimony whereof Ihave signed my name to this specication in the presence of two subscribing witnesses.

WILLIAM F. BEARDSLEE.

Witnesses:

' G. W. GREGoRY,

B. J. Novus.

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