US160512A - Improvement in sewing-machines - Google Patents

Description

2Sheets-She-etl. A. S. DINSMORE.

Sawing-Machine. No.160512, Paten ted March 9, I875.

THE GRAPHIC G0.PHOT0.-LlTH-398=4I PARK PLAOE,N-Y-

UNrrnn Si're'rns PATnivrfOrrron ALFRED S. DINSMORE, OF BOSTON, MASSACHUSETTS.

.IMPROVEMENT IN SEWING=MACHINES.

Specification forming part of Letters Patent No. 160,5 1%, dated March 9, 1575; application filed January 3, 1875.

To all whom it may concern:

Be it known that I, ALFRED S. DINSMORE, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improved Sewing-Machine, of which the following is a specification Y My invention relates to improvements in sewin g-machines for use in factories or other places where it is desired to unite piece-goods in order to form long continuous pieces.

In my machine the fabrics to be united are impaled on pins projecting from a horizontally-moving circular baster plate orring,toothed at top, to be engaged and moved by toothed wheels actuated from a worm or other gear on a rotating shaft of the sewingmachine proper,

which is placed in a vertical position, or so that the needle reciprocates in substantially a horizontal plane.

My invention consists in the combination, with sewing mechanism and the toothed baster-plate, of mechanism, substantially as hereinafter described, for moving the baster-plate and fabric from a gear on the sewing-machine shaft; and also in the combination, with the gear for moving the baster-plate, of a pawl and ratchet, whereby the toothed wheel that engages the teeth of the baster-plate may be disengaged from its operating-shaft, so that the baster-plate and fabric may be turned freely in either direction, so as to bring the fabric in position quickly to receive the action ofthe needle.

Figure 1 is a top view of my invention. Fig. 2 is a side view of the basterplate, with a part of its driving mechanism broken away, and Fig. 3 is a view of the pawl and ratchet and toothed wheel for driving the baster-plate.

In the drawing, A is the frame ofthe machine, circularin formto support the flanged supporting-ring R, on which rests and is moved the baster-plate P, provided at top with teeth, and having projecting from it fabric-holding pins 19, on which the fabric is impaled, and by which the fabric is suspended. A stitch-formingmech anism, preferably of Willcox & Gibbs class, is supported on a standard, a, rising from the frame A, and is mounted ,with relation to the circular horizontally-moving baster-plate, so that the baster-plate moves between the hookshaft and presser-foot, and the needle works through a needlehole made in the ring It.

The G-shaped arm B of the sewing-machine has its base attached to a vertical standard, a, attached to frame A by screws m or otherwise, and the hook-shaft I), provided with hook I) for forming, in connection with an eye-pointed needle, the usual chain-stitch, is driven by a belt, 0, over its fly-wheel O, the belt extending from such fly-wheel to a fly-wheel, n,on a shaft,0, provided with fast and loose pulleys 0 0 operated by power. The shaft 0 is supported in a bearing, 0 at the top of a standard rising from frame A. I do not, however, limit myself to these devices for moving the shaft 1), as other suitable or well-known devices may be employed instead. The vibrating arm D, supported on arm B, is connected with needle-carryin g bar d, and the arm is vibrated through the link 0 connected with it and with an eccentric on the hook-shaft b. On the needle-bar is a collar, 0, having a finger projecting from it toward the stock of the presser-foot f, and under a second flanged collar, f, on such presserbar stock. This finger, as the needle-bar rises, acts against the collar f, and lifts the presserfoot f from the fabric just as the point of the needle is withdrawn therefrom, in order to leave the fabric entirely free to be moved by the baster-plate, and the said resser-foot again strikes the fabric just as the needle is to penetrate the fabric. On the hook-shaft b isa worm-gear, 9, that engages a toothed wheel, g, mounted on a stud projecting from the standard a or other suitable support. On the collar of this wheel g is a toothed wheel, k, that engages a larger toothed wheel, h, on a shaft, 13, having an attached ratchet-wheel, '6. This shaft also carries a toothed wheel, j, mounted loosely thereon, but held so as to move with the shaft by means of a pawl, 70, on the end of apin, is, having a milled nut, so that the operator of the machine may turn the pawl by hand.

When the pawl k is in the position shown in Fig. 3, the rotation of the shaft i will move the toothed wheel, and, consequently, the baster-plate, so as to carry the fabric along under the needle and perform sewing, and the spring 1 holds the pawl in engagement; but the pawl may be disengaged, when it is desired to move the baster-plate, without moving the sewing mechanism, as is often the case, to

place the fabric on the pins 10, and to move it quickly in place under the needle, or to reverse or turn back the baster-plate in case of imperfection in the sewing or seam.

When the pawl is turned away from the position shown in Fig. 3, the spring l bears on the back side of the pawl, and holds it from the ratchet-wheel i. The needle is supplied with thread in the usual way from a spool.

In operation, two pieces of fabric to be joined or sewed together areimpaled on the pins 12, the pawl 70 being disengaged from the ratchet, and when the fabric is properly secured on the pins the baster-plate is moved so as to bring the edge of the fabric under the needle which works through a throat in the ring It. Then the pawl k is turned to engage the ratchet i, and the machine is started, after which the gears g g h h j move the baster-plate along the distance of a stitch at each revolution of the sh aft 1). The forward bearing 1' of the the hook-shaft b is curved to adapt it to the curved baster-plate.

The fabric is entirely relieved from friction of the presser when the baster-plate is moving, and the presser-foot acts as a holder, to prevent any movement of the fabric while the needle is in the cloth.

I am aware that a baster-plate or cloth-supporting ring has been moved from aworm-gear on a shaft not forming part of the sewing mechanism, and connected by gearing with the baster-plate, and this worm-shaft is banded with the driving-shaft of the sewing-machine, but with such connections the movements of baster-plate and sewingmachine are not positive at all times, and in myimprovement there is a less number of parts, and they are more compactly arranged.

Having described my invention, I claim 1. The combination of the rotatinghook-shaft audits wormgearwiththetoothed baster-plate, the toothed wheel for moving the baster-plate, and connecting-gearing, substantially as described.

2. The combination of the hook-shaft and its worm-gear with the shaft I, operated from the hook-shaft by gearing, its ratchet, and the toothed wheel j and pawl, and the baster-plate, substantially as and for the purpose set forth.

3. The combination of the horizontally-moving baster-plate with the needle-bar, needle, presser-bar, presser, and finger and collar f,

the finger and collar holding the presser from the fabric while the feed takes place or the baster-plate is moving, substantially as and for the purpose set forth.

4. The combination of the frame A and its standard for supporting a stitch forming mechanism with the circular and toothed hast er-plate, the supporting-ring, and mechanism actuated by the hook-shaft to move the baster-plate, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED S. DINSMORE.

Witnesses:

G. W. GREGORY, S. B. KIDDER.

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