US270984A - Sewing-machine - Google Patents

Description

(No Model.)

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SEWING MACHINE.

Patented Jan.23, 1883.

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UNITED STATES PATENT OFFICE.

JOHN BnPRICE, OF WOLLASTON, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 270,984, dated January 23, 1883.

Application filed October 23, 1882. (so model To all whom it may concern Be it known that I, JOHN B. PRICE, of Wollaston, county of Norfolk, State of Massachusetts, have invented an Improvement inSew ing-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention in sewing-machines relates to improvements in mechanism for controlling the needlethread, and also in improvements in feeding mechanism. While the point of the needle moves from its highest position to the cloth-plate, the needle-thread must be so held or controlled as to prevent it from getting under the point of the needle. This I have done by means of a clamp arranged outside the face-plate of the head, and operated at the proper times by a rod having upon ita tappetsleeve, the arm of which is struck by a cam projection, shown as forming part of the disk which carries the needle-bar-actuating crankpin. The cam projection referred to, acting against the tappet-sleeve, causes the clamp to hold thev thread; but as soon as the tappetsleeveis relieved from the action of the cam the strain on the needle-thread moves the clamp sufiicieutly to permit the thread to render freely, thus avoiding the use of springs and levers.

The improvements in feedingmechanism consist in a novel construction of fulcrumblock. The fulcrum-block is provided with a hole for the reception of the guide-bar, and with a socket at right angles thereto for the reception of a swivel, provided with a hole for the feed-actuating rod, it having at its front end a loosely-held wedge-block, the sides of said wed ge-block fitting closely the walls of a notch made in the feed-bar, the said walls being rounded to prevent cramping.

Figure l is a side elevation, partially in section, of a sufficient portion of a sewing-machine to show my improvements in thread-controlling mechanism; Fig. 2, a sectional detail in the line .10 .70, Fig. l; and Fig. 3 is a section of Fig. 2 on line 00 Fig. 4 is an under side view of the said machine, showing the feedactuating mechanism; Fig. 5, a partial longitudinal section of Fig. 4 in the line 00 Fig. 6, a partial section of Fig. 5 in line a; Fig. 7,

a partial section of Fig. 4 in line as, and Fig. 8 a partial section of Fig. 4 in line 00 The frame-work A, of usual shape, has in its overhanging arm a rotating shalt provided at its front end with a disk, A, which has, at its front side the usual needle-bar-actuating crank-pin. (Not shown.) This disk at its rear side is provided with a cam, a, which at each rotation of the disk strikes an arm, I), ota tappet-sleeve, B, placed upon a rod, 0, which is extended through a slot in the needle-bar G, and through holes in the head of the machine and its face-plate, and receives uponit a clamp or disk, d, the said disk beingplaced upon the said rod next the head 0 thereof, as .shown in Fig. 1.

The inner end of rod 0 is screw-threaded to receive an adj usting-nut, d, which acts upon the end of the loosely-held tappet-sleeve, and by turning the said nut the tappet-sleeve may be so adjusted with relation to the rod and disk A that the earn a. thereon will move the rod and cause the clamp or disk d to pinch or hold the thread with more or less force. The tapp'et-sleeve is kept from rotating by the extension of its arm b into a suitable slot made in the head of the machine.

The cam a is so placed upon the disk A that the needle-thread 0, extended from a guide-eye at the upper end of the needle-bar, under the clamp or disk (1, and into the eye of the needle 0, will be clamped or held against the faceplate during the time that the point of the needle descends from its most elevated position to the cloth-plate, after which the cam a passes'off from the arm b and leaves the clamp without pressure upon the needle-thread, so that the needle-thread may be sufficiently slack to permit the ea y entrance of the usual shuttle through the loop of needle-thread.

The feed-barf has at its under side a trans verse notch, the side walls of which, as shown in Fig. 5, are rounded.

The under side of the bed-plate has cast upon it a rest-plate,f, for the feed-bar wedge f connected loosely with the feed-actuating rod or leverf by a screw or pin, 2, such loose connection permitting the feed-bar to rise and fall about its fulcrum without cramping, as would a swivel-block, g, dropped loosely into a chamber or hole in the fulcrum-block g, made to slide upon the guide-rod having its ends held in fixed bearings. The fulcrum-block g has connected with it by a screw, 3, the feedadjusting bar h, provided at its rear end with a screw, m, which is extended up through a slot, m,of the bed-plate, and receives a thumbnut, m by which to move and fasten the bar it in adjusted position. The rod f has connected with it at its rear end the arm u, having one end made as an eccentric-strap to embrace the feedactuating eccentric 0 on the usual vertical shaft, 1), which is common to the Singer and other machines. The rotation of the eccentric 0 reciprocates and vibrates the rodf and the movement of its forward end is made more or less by adjusting the fulcrumblock 9.

I claim- 1. The face-plate of the head, the threadclamp, the. rod, and its attached tappet-sleeve, combined with the rotating disk A and its cam a, to operate substantially as described.

2. The threaded rod 0, its adjusting-nut, the -25 head, its tace-p1ate,thread-clan1p, and the tappet-sleeve, combined with the disk A and its cam a. substantially as set forth.

3. The feed-bar and its actuating-rod, combined with its loosely-held wedge fitted to a 30 notch in the feed-bar, substantially as described.

4. The combination, substantially as shown and described, of the swivel g, the feed-actuatingrod f supported therein, the fulcrum-block 5 g, provided with a cavity, in which said swivel is inserted from the upper side, and the guiderod 9 upon which said fulcrum-block is adjustable, as set forth.

In testimony whereofI have signed myname 40 to this specification in the presence of two subscribing witnesses.

JOHN B. PRICE.

' Witnesses:

G. W. GREGORY, B. J. NOYES.

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