US139525A - Improvement in cutting attachments for sewing-machines - Google Patents

Description

UNITED STATES Parana JOHN E. WIGGIN, on sronnHAM, MASSACHUSETTS, ASSIGNOR To HUGH H. MAWHINNEY, on SAME PLACE.

IMPROVEMENT IN CUTTING ATTACHMENTS FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 139,525, dated June 3, 1873; application filed March 29, 1873.

To all whom it may concern:

Be it known that 1, JoHN E. WIGGIN, of Stoneham, of the county of Middlesex and State of Massachusetts, have made a new and useful invention having reference to Sewing- Machines, whereby cloth may be sewed and trimmed at one and the same time automatically; and I do hereby declare the same'to be fully described in the following specification Fig. 6 denotes a perspective view of a sewingmachine with my cutting or trimming attach- Inent.

My invention relates to a sewin g-machine or its table and the needle-passage thereof, provided With scissors or shears and mechanism for operating them or one blade of them, so that the stitching or sewing and trimming of the cloth or work parallel with the line of sewing may be accomplished automatically and simultaneously.

In the drawings, A denotes the table of a sewing-machine, andB the needle'hole or passage in such table. In this case the said hole is represented as made through the table and in a plate, 0, separate from the table-top, but arranged in it or in a socket, a, made in it, the plate being confined in place by a set-screw,-b. Close to that part of the needle-hole which goes through the plate 0 there is raised on the plate a stationary shear or blade, D, to operate with a vibratory or movable shear or blade, E, carried by an arm, 6, projecting from arockershaft, F. The shaft F is supported in an adjustable box or bearing, G, arranged on the table in manner as shown and held to it by clamp-screws d d, which go through slots 6 e in the box, and are screwed into the table, all being as represented. From the above it will be seen that the box, being adjustable, admits of the shear E being moved up to operate in close contact with the stationary shear D, however distant the latter may be situated from the needle-hole.

The object of having the stationary shear fixed upon a movable plate, 0, and the movable shear or its shaft-box adjustable inmanner as described, is to enable another such perforated plate with its stationary shear situated at a greater or less distance from the needlehole, to be substituted and the movable shear to be duly adjusted to the stationary shear of such substitute plate, as occasion may require.

As some kinds of work may need to be trimmed nearer to or further from the line of sewingthan others, I design to use a series of stationary shear-plates, 0, having their several shears disposed at different distances from their needleholes. The lower shear may be fixed to a plate separate from the needle-hole carrier or plate and be adjustable thereon, so as to vary the distance of the needle-hole and shear.

From the rear end of the shaft F there projects an arm, H, formed and provided with a notch, f, as represented. Furthermore, there extends from the shaft F another arm, G,which turns freely 011 the shaftF and is slotted lengthwise at s to receive a screw, g, projecting from a lever, I, pivoted upon an eccentric, h, fixed upon the driving-shatt'i of the seWiHgmachine. The screw 9 goes through a bowed spring or friction-brake, is, applied to one side of the arm G. A nut, l, screwed upon the screw 9 and against the brake or spring serves to regulate the pressure of the brake against the arm G.

Astudmz, extending from the lever I, as shown, may, by moving the lever, be moved either into or out of the notch f.

Fig. 5 is a transverse section taken through the lever I and its operative eccentric h, and showing the arm Gr.

WVhen the stud m is in the notch f and the driving-shaft is in revolution a short reciprocating rotary motion will be imparted to the shaftF, whereby the movable shear will be alternately raised and depressed, but when the stud is out of the notch no movement will be imparted to the shalt F. In order that the cloth or work may be fed along as occasion may require for the production of the stitches, the movable shear should be raised preparatory to each advance of the cloth and be depressed upon the cloth while the latter may be at rest, the cloth at the time being extended over the stationary blade or shear. Thus, while the sewing may be in the act of being performed, the cloth or work will be cut or trimmed along its edge and in parallelism with the range of stitches.

I am aware that it is not new to apply to the table of a sewing-machine a pair of scissors or shears to be operated automatically, such being shown in the United States Patent 109,662, dated November 29, 1870, which, how- 7 ever, neither exhibits nor explains any arrangement of the cutting mechanism with the needle and its hole in the table, so as to cut or trim the cloth parallel to the range of sewing. during production of the latter. I therefore make no claim to the invention described in such patent.

I claim as my invention as follows, viz:

1. The movable shearE, its shaftFand shaftbox G, adjustable and fixed to the table A by means as set forth, in combination with the stationary shear D and its perforated plate 0, applied to the table in manner as explained.

2. The combination of the eccentric lever I, the stud m, screw g, nut 1, spring k, slotted arm G, and notched arm H.

3. The combination of the shearshaftF and the eccentric h of the driving-shaft with the eccentric lever I, the stud m, screw g, nut l, spring k, slotted arm G, and notched arm H, all constructed and arranged substantially in manner and to operate as specified.

JOHN E. WIGGIN.

Witnesses: JOHN DEAN, SILAS DEAN.

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