US247357A - Sewing-machine - Google Patents

Description

2 Shet-Sheet 1.

(Model) T. S. HUNTINGTON. SEWING MACHINE.

No. 247,357. Patnted Sept. 20,1881.

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T. S. HUNTINGTON. SEWING MACHINE.

No. 247,357. 7 Patented Sept. 20,1881.

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v I e wen a UNITED STATES PATENT OFFICE.

THOMAS S. HUNTINGTON, OF NEW YORK, N. Y., ASSIGNOR TO THE GOLD MEDAL MACHINE COMPANY, OF ORANGE, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 247,357, dated September 20, 1881.

Application filed March 5, 1881.

' To all whom z't may concern:

Be it knownthatI, THOMAS S. HUNTINGTON, of New York, county and State of New York, have invented Improvements in Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification.

This invention relates to improvements in' sewing-machinesofthatclass wherein the shut- IO tle oscillates in the arc of a circle about a horizontalaxis, the shuttlederivingits motion from a rock-shaft.

My improvements relate to means for operatin g the sh uttle-carrying rock-sh aft, whereby all tendency of the oscillating shuttle to move beyond its established points in each directionis overcome, notwithstandingvariationsin speed.

It is well known that oscillating shuttles actuated from rock-shafts have their throw or movementin each direction increased with each increase of speed, and in running such a machine at high speed (it at slow speed workingproperly) there is such an increase of move ment of the shuttle, owing chiefly to momentum,-a s to break the shuttle-thread and seriously aflect the stitch by pulling from the sh uttle at high speed more thread than is drawn from the shuttle at the average or slow speed ofthemachinethespeedatwhichthemachine is for the most part worked. This additional slack in the shuttle-thread destroys the uniform appearance of the stitch. To obviate the difficulties arising from the overthrow of the shuttle, the thread has been delivered from the shuttle near the center of its oscillation, the delivery of the shuttle-thread out of center being just sufficient to allow slack thread, just as the feed takes place; but as the material increases in thickness or the stitch in length, the amount of slack thread provided for by the delivery of the shuttle-thread a little out of the center of oscillation of the shuttle is so small as to be inadequate and breaks the shuttle-thread orpuckers the goods. These same diftioulties are also produced by overthrow.

In my improved machine I employ a'sliding pin on a connecting-rod,which pin, before entering the slot in the crank-arm of the oscil- (ModeL) lating shuttle-moving rock-shaft, is extended through a slot of a guide-block, the latter so controlling the movement of the said pin as to cause it to move the said crank and rock-shaft only a certain predetermined distance, no matter at What speed the machine is run, thus completely obviating all evil effects from overthrow. The slot in this guide-block is made more or less irregular or out of line with relation to the axis of the said rock-shaft, to cause 6 the said pin to approach toward or recede from the axis of the said rock-shaft in the slot of the said crank and vary the velocity of the shuttle at certain portions of its travel-as, for instance, to move it rather slowly until the 6 point of the shuttle enters the loop of needlethread, when the speed of the shuttle is gradually increased until the shuttle passes through theloop,butisagainmoved slowlyasitcomes to its most forward position, where it rests while the take-up, which commencedto rise before the shuttle finished its passage through the loop, completes its rise, operates and finishes the stitch just made, the shuttle completing its forward movementjust as the takeup finishes its upward movement, the needle-bar being also at its highest throw.

By giving to the shuttle an irregular movement I am enabled to actuate the needle-bar at a uniform rate of movement, and thus ob- 8o viate the use of a heart-cam or the so-callcd dip motion of the needle-bar to make slack in the needle-thread for the passage of the shuttle.

My shuttle is arranged to oscillate within an annular chamber, and is supported upon a shuttle-rest hinged to a plate or disk connected with the shuttle-actuating rock-shaft, the said rest having connected with it a sh uttle-holder, which holds the shuttle pressed up against the 0 said plate or disk.

The take-up is composed of a sector or arm having an irregular slot, and pivoted at one side of the center of the needle-bar-moving shaft. The sector derives its movement from 5 the rotating crank-pin which moves the needle-bar, the crank-pin entering a straight slot in a block at right angles to the needle-bar. This sector, owing to the location of its pivot and theshape of its slot, has given to it a vazoo s cause itto move up to and catch theloop of neeriable motion, the sector moving slowest as the crank-pin descends to pass its lower center,

the speed of the sector gradually increasing as the said crank-pin rises from its lower to its highest center. are of a circle, engage a pinion attached to a shaft having adj ustably secured to it the takeup arm, the latter thus having given to it motion in the arc of a circle of greater or less radius.

Figure 1 is a side elevation of a sewing-machine containing my improvements, the framework being partially broken away; Fig. 2, an under-side view thereof, thefeedingmeehanism beingomitted ;Fig.3, apartial cross-section and front view of the head, with the face-plate of the head removed to show the take-up-moving devices, the needle-bar being partially broken out. Fig. 4 is a detail of the guide-block,.the forked crank or arm at the end of the oscillating shuttle-movin g shaft, and the sliding pin 5 and Fig. 5, an inner-side view of the needlebar.

The frame-work a of the machine, the main rotating shaft a, crank-pin a the vertical shaft a the gears a a and the counterbalanced crank a atits lower end, are, as herein shown,

all as in the Singer sewing-machine, and need not, therefore, be particularly described.

Home machine.

of the frame or bed of the machine at N.

a pin,d, which I shall hereinafter denomiuate the sliding pin. This pin is extended through the slot 6 in the guide-block 0, herein shown as fixed to the under side of the frame or bed of the machine. The outer end of this pin is made to enter a slot in the crank-army, secured to the horizontal rock-shaft f, supported in suitable bearings, and having at its other end the arm or disk f against which the inner side of the shuttle g is kept pressed by the holder 9, secured to the shuttle-rest g pivoted or hinged to the said arm or disk f at 2. The forward part of the connecting-rod c is acted upon at its outer side by a ledge, c ,which serves to keep the pin (I pressed into the slot in the crankf. The slot cin this guide-block, shaped as shown in Fig. 4, is curved irregularly with relation to the center of the rockshaft f, (denoted in dotted lines in the said figure,) and the slidingpin d, owing tolthe shape of the said slot 0, is made to approach toward and recede from the center of the said rockshaft in the groove of the said arm f, as the sliding pin is moved by the connecting-rod 0, thus accelerating and lessening the speed of the shuttle during portions of each stroke, to

The teeth of the sector, in thedle-thread slowly and thereafter move faster while passing through the said loop, and then continuing its forward movement more slowly, and finally almost stopping near its extreme forward position for the take-up to finish the stitch. This sliding pin, loosely connected with the crank-arm f, and guided in this way by the slot 0 of the guide-block 0, always operates the said crank-arm and rock-shaft for just the same distance at each forward movement of the sliding pin. and causes it to carry the point of the shuttle forward to just the same point at whatever speed the shaft to of the machine may be run, thus completely obviating alldifficulty arising from overthrow ofthe shu ttle and improper strainon the shuttle-thread, as before explained.

The holder and rest are held up in operative position by a rest-locking device, It, shown as a turn-button.

The shuttle gcontains a disk-bobbin of usual construction, loosely placed in a recess fromv The shuttle on its back-stroke gives up slack The feeding devices, omitted from the draw-- ings because not of my invention, maybe as in the Singer family machine or as in the New;

thread for the feed, substantially as do the machines hereinbefore referred to. This shuttle is made to oscillate in a circular cavity;

The balanced crank a, as herein shown, is provided with a pin, I), which enters 2LS10l3,b',i in a radius-bar, b pivoted to the under side. This; radius-bar at its front end has joined with itE the connecting-rod 0, having at its forward end but it may be readily removed therefrom by turning the shuttle-rest out from the said cavity, and the shuttle may, if desired, be removed and its tension altered without breaking the shuttle-thread or disturbing the material under the presser-foot.

The crankpin (6 carried by the usual disk at the end of shaft to and provided with the usual friction-roller, is extended through the irregular slot t in the arm or sector It, pivoted at It at one side the center of shaft a. The teeth 3 of this sector engage the teeth of the pinion-k on the short shaft or stud having adjustably attached to it the take-up it, it having at its end a hole or eye, 4:, to receive the needle-thread extended from the usual needlethread tension device I under the loop 1, Fig. 3, and up through the stationary eye Z Fig. 1, the needle-thread led through the said eye 4 being then led back through the eye 1 into and through the eye 5 at the lower end of the needle bar on the needle fastening screw through the eye of the usual needle from its front side. Just after the needle-bar begins to descend the take-up commences to descend in I J arc of a circle, and continues to so move until its lower end passes beyond the eye Z During this time the shuttle enters and passes about half-way through the loop of needlethread, when the shuttle, to move farther forward and not break the needle-thread, demands more thread from the needle and take up. Theneedle-thread so demanded is quickly supplied by the take-up, which is then moved back, giving up a little slack thread, which enables the largestpart of the shuttle to pass through the loop of needle-thread, and as the shuttle completes the latter part of its passage through the said loop the take-up rises and accelerates the passage of the loop of needlethread from the heel of the shuttle and takes up the slack in the needle-thread. The needle-bar is substantially at its highest point when the heel of the shuttle passes through the loop of needle-thread, and at such time the take-up commences to rise rapidly to take up the slack thread, and completes its upward motion just before the needle starts down.

The pivot of the take-up sectoris located at one side the center of the shaft carrying the crank-pin which moves the said sector, and the slot in the sector is of such shape, in connection with the position of its pivot, that the crank-pin moves the take-up faster when the needle-bar rises than when it descends, thus giving all the time possible for the shuttle to get through the loop of needle-thread, and the time is different than were the pinion of the take-up driven from the needle-bar or at its speed. The crank-pin a after passing through the slot in the sector, enters a straight slot, W, in a block, m, secured to the needle-bar m.

I do not desire to limit my invention to the exact devices shown for reciprocating the connectingrod c from the rotating shaft of the machine, as I may employ for such purpose any other well-known mechanism employed in shuttle sewing-machines to reciprocate aborizontal rod lengthwise of the cloth-supporting bed. I do not broadly claim an oscillating take-up operated by a rack and pinion moving in unison with the needle-bar,- as I am aware that that kind of a take-up is old.

I claim 1. In a sewing-machine employing an eyepointed needle, an oscillating shuttle, a rest, and rock-shaft provided with an arm or crank,

combined with connecting-rod and sliding pin loosely connected with the said arm or crank, and aslotted guide-block to directthe said pin, substantially as and for the purpose described.

2. The reciprocating connecting-rod and its attached sliding pin, combined with the guideblock provided with an irregular slot, 0, through which the said pin is extended, and with the arm of a shuttle-moving rock-shaft, with whichthe said pin is loosely connected, whereby the sliding pin is caused to approach toward and reeede from the center of the said rock-shaft at each-movement of the rock-shaft in each direction to vary the speed of the shuttle, substantially as described.

3. The reciprocating rod 0 and its sliding pin, combined with the slotted guide-block, and the ledge to act upon one side of the connecting-rod and retain the said pin in the slot of the said block, substantially as described.

4. The sector pivoted as described, and crank-pin to move it at avariable speed, combined with the take-up and pinion secured to the shaft of the take-up and operated by the sector, substantially as described.

5. In a sewing-machine, a needle-bar and eyepointed needle having a uniform ascending and descending movement, combined with a take-up having a variable movement in its ascent and descent, and with the sh uttle-carrier, and the semicircular shuttle 9, adapted to oscillate, as described, aboutits own center, and with means to operate the carrier and shuttle at a variable speed at each forward and backward movement and prevent overrunning of the shuttle, substantially as described.

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

THOMAS S. HUNTINGTON.

\Vitnesses:

G. W. GREGORY, W. H. Sresrron.

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