US680192A - Thread-controlling device for sewing-machines. - Google Patents

Description

No. 680,!92. PatentedAug. 6, |90I.

B. J. BERGMAN. THREAD CONTRLLING DEVICE FUR SEWING MACHINES.

(Application led Apr. 24, 190 0.)

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No. 680,!92. Patented Aug. 6, I90l.

B. J. BERGMAN.

THREAD CONTROLLING DEVICE FUR SEWING MACHINES.

(Applic'ation filed Apr. 24, 1900.) (No Model.) 2.S heets-$heet 2.

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I UNITED STATES PATENT EEICE.'

BENJAMIN J. EEEGMAN, oE NEW YORK, N. Y.

THREAD-CONTROLLING DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 680,192, dated August 6, 1901.

Application iiled April 24, 1900. Serial No. 14,099. (No model.)

T all whom t may concern.-

Beit known that 1, BENJAMIN J. BERGMAN, of New York, county and State of New York, have invented an Improvement in Thread- Controlling Devices for Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

The invention to be herein described is applicable more especially to buttonhole-sew# ing machines of the class represented in United States Patent No. 494,280,dated March 28, 1893.

In accordance with this invention I have applied to the rotating needle-bar a pull-off device and thread-guard, said device pulling od from the thread-suppl y a sufficient quantity of thread just as or before the buttonhole is completed, and the stitch-forming mechanism is stopped withv its needle withdrawn from the work, said slack thread being freely supported by the guard and given up to the complemental stitch-forming mechanism coperating with the eye-pointed needle when said needle is again started to make its rst stitch in another buttonhole to be made. In the machine to be herein described,as provided for in the patent referred to, the stitch-forming mechanism carried by a stitch-frame is started into operation at Yone end of the buttonhole and overedge stitches are made completely about the edge of the buttonhole, and the buttonhole having been completed by a relative change of ,position of the stitch-frame and clothframe provided with the usual cloth-clamp the stitch-forming mechanism is put into its inoperative position or stopped with the needle elevated, and thereafter while the stitch-forming mechanism is inoperative the relative positions of the stitch-frame and clamp-frame are changed to bring into its operative -position the buttonhole-cutting mechanism, and in such position ofthe parts the machine is stopped. The operator puts the material in which the new buttonhole is to be cut in the clamp and closes the clamp, which starts the machine, causing the cutter to descend and cut the buttonhole. This is done at a high speed of the machine and the high speed is continueduntil a change is eected in the relative positions of the stitch-frame and cloth-frame to put the stitch-forming mechanism in position to commence stitching a cut buttonhole, all as in said patent. On the arrival of the stitch-forming mechanism in its position to be started the stitch-forming mechanism is started automatically into operation, and

thereafter the slower speed of the machine controls throughout the stitching of the buttonhole. Herein the needle-thread pulled off from the tension device and stored up during the stitching of the buttonhole about the eye and from the eye to the finished end is freely supported by the thread-guard and given up to the stitch-forming mechanism at in illustrated it consists, essentially, of an y arm having thread-eyes and a collar and a thread-guard to freely support the thread, the collar being applied to the upper end of the rotatable needle-bar.

Figure l represents a top or plan View of a suiiicient portion of a buttonhole-sewing machine to enable my invention to be understood. Fig. 2 is a detail showing a portion of the usual cloth-clamp. Fig. 3 is a partial right-hand side view of the apparatus shown in Fig. 1. p showing the top of the needle-bar and the tension device with the pull-off in different positions. v

Referring to the drawings, a represents the overhanging arm of a stitch-frame. a. shows part of the clamp-frame; b', the needle-bar; d2, the complete gear on the needle-bar; b2, an eye-pointed thread-carrying needle; 22, one of the levers of a cloth-clamp; m', a clamping-foot of said lever; 23, a pivot for the lever 22; b3, a take-up; b4, a tension device for the needle-thread, it being acted upon by a spring b5, the force of which is controlled by a nut bs. These devices are all common to the patent referred to. Coperating with this Fig. 4 is a diagrammatic Y'view' IOO o needle-bar h' out through an opening 17, comeye-pointed needle b2 in the formation of overedge stitches for buttonholes isl in practice in said patent, and the stitch-frame will carry,

as provided for in that patent, buttonholecutting mechanism actuated as provided for in said patent, and the' stitch-frame in the operation of stitching a buttonhole will vbe run at one speed and after the buttonhole has been finished and the stitch-termin g mechanism has been'stopped, so that it no longer stitches, a faster-speed mechanism will come into operation to impart a faster motion to the parts during the time that the relative positions ofthe stitch-frame and clamp-frame are being changed to put the buttonhole-cutting mechanism into proper cooperative relation to the clamp that the latter may receive new material and the buttonhole be cut, and the stitch-traine and cloth-frame may then be returned into a position to put the stitch-forming mechanism into positionv to be again started to commence the stitching of a new buttonhole.

I will now particularly describe my additions to the old parts herein alluded to.

As I have herein chosen to illustrate my invention the collar 10,01 the arm 12, constituting one form of pull-off, is slipped over the end of the needle-bar b and secured in position thereon by a set-screw 13. The arm has, as-shown, (see Fig. 3,) three thread-holes, through either of which maybe passed the needle-thread 14 under the control of the takeup be', the thread coming to the take-up from a suitable tension device, as b4. The arm shown has two like thread-guards 16, which preferably extend lengthwise of the arm on one side thereof, being secured at or near the end of the arm and also at or near the collar. This thread-guard extending lengthwise of the arm serves to freely support the slack thread after it is drawn from the thread-supply. The needle-thread from the take-up is led through one of the thread-holes in the arm, and thence down through the hollow mon to said patent, at the lower end of said ierle-bar, and through the eye of the nee- Figs. 1 and 3 by full lines show the pull-off in the position it occupies when the stitchframe and cloth-frame are in position to receivematerial that the cutter may act to cut the material. The dotted-line position, Fig. 1is that occupied by the pull-off when the stitching of the buttonhole is to be commenced, the full-line position, Fig. 4, being that occupied by the pull-off as the stitching of the buttonhole is completed. Viewing Fig. 1, the position designated by dotted lines is that occupied by the pull-off when the stitch forming mechanism is about to be rholding the thread taut.

started to commence the Astitching of 'a buttonhole, and it will be seen that there is slack thread (designated by dottedlines) between the end-of the pull-0E and the take-up.

This rslack thread freely supported on the forming device, so that wit-h such slack thread y vstored up there is no possibility of the first stitch in making the buttonhole not being made properly.

During the operation of stitching the buttonhole the stitch-frame and cloth-frame have imparted to them relative movements at a predetermined speed, the stitch forming mechanism making stitches along one side of the buttonhole about the eye thereof and then along the opposite side and finishing the buttonhole, and during this stitching of the buttonhole and finishing the same the pull-oft rotates with the needle-bar and stops in the full-line position, Fig. 4, so that the needlethread is made to occupy the position shown by the line lli-that is, it is led from the takeup or tension about the collar and along the side of the arm of the pull-off. In this position the needle-bar is lifted and the stitchlforming mechanism, the buttonhole having been completed, is stopped with the pull-off At this point the fast-speed driving mechanism for the stitchframe, fully described in said patent, comes into operation and the stitch-frame is moved in the direction of the'arrow 7, Fig. 1, causing the needle-thread to be bent over the finger 2O of the cloth-clamp, as represented in Fig. 3, the movement of the stitch-frame being continued until the usual buttonhole-cutter (not shown, but commonto said patent) is put into operative position with relation to the open cloth-clamp. The cutting mechanism having been brought into operating position, the fast-speed motion is thrown out of operation and the stitch-frame is left stationary with the needle-bar yet elevated, and during this motion of the stitch-frame the usual sector for rotating the stitch-forming mechanism has turned .the needle-bar b', so that the pull-oft occupies the position shown by full lines, Fig. l, and as the cutting mechanism comes into position to have the material put into the clamp the pull-oft' has given up some slack thread which has been pulled through the needle by the action of the needle-thread between the point of the needle and the work against the finger 20. When the pull-od occupies the full-line position, Fig. 1, the operator cuts the needle-thread close to the work, puts the new material in the open clamp, and closes the clamp. The closing of the clamp puts automatically into operation the usual fast-speed mechanism common to said patent, and by the time that ,-thefcutter begins to descend the pull-0E occupies the position shown by dotted lines,

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Fig. 4. The cutter .operates quickly and rises and the fast-speed operating mechanism continues until the stitch-forming mechanism has been brought into its starting position, at which time the pull-off occupies the dotted-line position, Fig. l. Viewing Fig. l, it will be seen that the thread leads directly from the take-up to and through the eyes at the end of the pull-oif and thence into the hollow needle-bar. The starting position of the pull-off when the rst stroke of the needie is made in commencing to stitch a buttonhole leaves a'. considerable amount of slack thread sufficient to always insure that the under or complemental stitch-forming mechanism engage the loop of needle-thread and secure the needle-thread in the work. The ,stitch-forming mechanism .is started while a slower speed is available for moving the stitch-frame, and during this stitching operation the pull-off moves from its dotted-A line position, Fig. l, into the full-line position, Fig. 4, said full-line position showing the position occupied by the pull-off and stitching mechanism when the last stitch of the buttonhole is completed,'the stitching mechanism at the rise of the needle from the point where it made its last stitch in the buttonhole being suspended while the cutting operation takes place, as hereinbefore described.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a buttonhole-sewlng machine, stitchforming mechanism comprising a needle-bar, means to rotate said needle-bar, an attached pull-01T having a thread-receiving hole near its end to receive the needle-thread on its Way to the needle-bar, and an attached thread-guard exten-ding lengthwise of the pull-off and on which the thread is adapted to be freely supported, the rotation of the needle-bar in stitching a buttonhole pulling off a supply of thread with which to commence the next buttonhole.

2. In a buttonhole-sewing machine, stitchforming mechanism comprising a needle-bar, means for rotating said bar, an attached pullo having a series of thread-receiving eyes near its end and a thread-guard connected to said pull-off, said guard extending lengthup at the commencement of the next buttonv hole.'

et. A hollow needle-bar, a pull-off adjustably attached to said needle-bar andv having a thread-receiving eye near its outer end to through said needle-bar, and means to rotate said needle-bar during the stitching operation to draw 0E slack thread from the thread-'supply during stitching and to give up said'slack thread during a reverse movement of said needle-bar to put it in position to resume stitching of another buttonhole, and a threadguard extending on one side ofA the pull-off and on which the thread is adapted to be supported.

5.A In a sewing-machine, the combination with the stitch-forming mechanism comprising a needle-bar, of a pull-od axially adjustable on said needle-bar and. having a series of thread eyes or passages for the thread 1ocated at different distances from the needlebar and thread-guards connected to said pulloff and movable therewith and on which the thread is adapted to be freely supported.

6. In a sewing-machine, the combination.

with the stitch-forming mechanism comprising a needle-bar, of a pull-off carried by said needle-bar, and having a thread-eye, and thread-guards extending lengthwise of and above and belowthe pull-od between which the thread is adapted to be freely supported. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

BENJAMIN J. BERGMAN.

Witnesses:

GEO. W. GREGORY, MARGARET A. DUNN.

7o receive the thread preparatory to its passage

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