US389026A - Take-up mechanism for sewing-machines - Google Patents

Description

2 SheetsSheet 1.

(No Model.)

B. THOMPSON.

TAKE-UP MECHANISM FOR. SEWING MACHINES.

Patented Sept. 4, 1888.

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(No Model.) 2 Sheets-Sheet 2.

R. THOMPSON. TAKE-UP MECHANISM FOR SEWING MACHINES. No. 389,026. Patented Sept. 4, 1888.

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ROSEXVELL THOMPSON, OF BRIDGEPORT, CONNECTICUT.

TAKE-UP MECHANISM FOR SEWiNGHVlACHlNES.

SPECIFICATION forming part of Letters Patent No. 389,026, dated September a, 1888.

Application filed August 18, 1887. Serial No. 247261. (No model.)

.To all whom it may concern.-

Be it known that I, BosnwELL THoMrsoN, a citizen of the United States, residing at Bridgeport, in the county of Fairficld and State of Connecticut, have invented a new and Improved Talte-Up Mechanism for SeWingMachines; and I do hereby declare the following to be afull, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification.

This invention relates to improvements in revolving-hook sewing-machines, in which a take-up mechanism is used to draw the long loop of thread through the fabric to complete the stitch after it has been carried around the loose disk bobbin by the hook; and the object of my invention is to perform this operation with but little motion of the devices which compose the takenp mechanism, so as to admit of a very rapid vibration of the parts when the machine is run at a high rate of speed.

Another object of my invention is to control the upper thread near the needle, so as to avoid the stretching of the same while drawing the loop through the fabric, and thus produce a uniform and even tension upon the stitch during the sewing operation. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure l is a side elevation of a revolvinghook sewing-machine with my improved takeup mechanism attached to the needle-bar hearings, and showing the position of parts when theloop is drawn through thefabric to complete a stitch. Fig. 2 is a side view of the left portion of the machine only, showing the position of the devices which compose the takeup mechanism while the needle is in the fabric and the loop of thread is being carried around the disk bobbin by the hook. Fig. 3 is a front view of the left end of the machine with front slide-plate and bobbin-holder removed, showing needle raised to nearly the highest point and the loop of thread carried past the vertical center of the disk bobbin ready to be drawn up by the take-up mechanism. Fig. 4 is a detached view of the needle, revolving hook, and

bobbin, showing the point of said hook entering the needle-thread. Fig. 5 is also a detached view ofthe same devices, but showing the hook partially revolved and carrying the loop of thread around the loose disk i)Obbil1,Willl6 the needle has an upward movement. Figs. 6 and 7 are enlarged perspective views of the takeup device separate from the machine, showing the parts in same position as shown in Figs. 1 and 2.

Similar letters of reference indicate corresponding parts.

Of the original machine, A. is the bed, 8 the arm, and C G the upper and lower needle-bar bearings. D is the needlebar-actuating lever. E is the needlebar. F is the presser-foot bar, and G is the presser-foot. H is the revolving hook. I is the disk bobbin, and J is the bob bin-holder. K is the main shaft, and L is the driving-pulley. M is a pitman connecting the needle-bar-actuating lever with driving-shaft K. N is the feedbar. O is the stitch-regulating bar, and P is the stitclrregulating knob. Qis the spool of thread. It is the threadcheck, and S the tension-disks.

The take-up mechanism is composed of the followingnamed devices:

a is the body of the take-up, and is a narrow strip of metal, having upon the extreme ends lugs b I), secured, respectively, to the upper and lower needle-bar bearings in the manner shown in the drawings. Into the bodya number of short round studs, 0 c c c, are inserted in such a position that the upper set of studs may be on the right side of the vertical center and the lower set on the left side of the same, as shown in the drawings. Narrow and thin strips of metal, (1 d, are placed over each set of studs to prevent the short loops of thread which pass between said studs from slipping off the same.

6 is a plate of metal pivoted at the center to a stud, f, at the center of the body a, and having upon the upper left side and lower right side a series of projections, g g g g, suificientl y narrow to pass between the studs 0 c c 0 when said plate is in a vertical position, as shown in Fig. 2. Upon the extreme ends of said projections are secured a set of short round studs, h h h h, of such a length as to just pass under the plates (1 (1 over the stationary studs 0 0.

dis a small roll fitted to'turn upon a small screw at the top end of the body a, over which the thread passes in its passage from the tension-disks to the take-up studs.

j is a hooked wire in the lower end of the body a, under which the thread passes in its passage from the lower takeup stud to the eye of the needle.

k is the take-up cam, having a slightly-irregular path on the periphery of the same, and is secured to the main shaft.

Z is the take-up lever, which is operated by said cam,being pivoted to screw-stud m on the arm of the machine.

a is a rod which connects the upper end of lever Z with the upper end of the vibrating take-up plate a, and communicates motion from the former to the latter.

I will now describe the practical operation of my improved take'up mechanism with ref erence to the accompanying drawings.

The bobbin is first filled with thread, leaving two or three inches unwound. It is then placed in the cavity of the hook with the thread wound in the direction in which said hook revolves, and the bobbin-holder secured in its proper position. The thread from the spool on the top of the arm is then passed over the thread-check, then around the tension-disks, theh through the coil of wire on the top of the arm, then over the small roll t. Then, with the vibrating plate 6 in a vertical position, as shown in Fig. 2,.the thread may pass between the set of studs 0 0 c a and h h h h, so as to form a straight line to the hooked .wire j, under which it is passed. The needle is then raised by the driving-pulley and the end of the thread passed through the eye of the same from right to left, leaving two or three inches of thread extending beyond the eye. The fabric to be sewed is now placed under the presser-foot, and, with the stitchregulating mechanism properly adjusted, the sewing operation is commenced by revolving the driving-pulley in the direction indicated by the arrow drawn upon the same. The path in cam is so formed and the same so secured to the main shaft in its relation to the revolving hook and reciprocating needle-bar as to cause the vibrating plate 0 to be in the vertical position shown in Fig. 2 while the eye of the-needle is below the fabric and the loop of thread brought down by said eye is being carried around the bobbin by the revolving hook to about the position shown in Fig. 3, after which the plate 6 is drawn back to about the angle shown in Fig. 1, taking up the loop of thread which is under the fabric during the remaining upward movement of the needle by means of the series of studs upon the body a and vibrating plate 0, the same causing a series of short loops, which aggregately amount to the same length of thread as composes the long loop under the fabric to be taken up. Said plate is retained in this angular position until the eye of the needle reaches the fabric in its downward movement, at which time it is brought to a vertical position, so that the thread may be slackened and forced through the fabric. by the needle to be carried around the disk bobbin by the revolving hook, after which the vibrating plate is again drawn back to the angular position to take up the loop of thread which is under the fabric, the above-described operations being repeated for each successive stitch.

taken collectively, amount to the sum of the I long loop of thread required to pass around the disk bobbin, I am able, with but little motion of the take-up mechanism, to draw the required length of thread through the fabric to complete the stitch, and that by my peeuliar arrangement of devices and movements I also avoid the stretching of the thread between the fabric and take-up mechanism any perceptible amount, in consequence of the short distance I have between the lowest stud of the latter and the stitch to be made upon the material.

Having now fully explained the construction and operation of my improved take-up mechanism, I. claim as new and desire to secure by Letters Patent- 1. The combination, with the stitch-form; ing and tension mechanisms of a revolvinghook lock-stitch sewingmachine, of a takeup device located between said mechanisms and means for operating said take-up device, said take-up device consisting of a vertical stationary plate having a central stud to which is pivoted a centrally-vibrating plate, each plate being provided with a series ofprojecting studs above and below said central stud, around which the thread may be alternately passed, the studs in the upper half of said stationary plate being at the right and the studs in the lower half of the same being at the left of the vertical center, the positions of the studs in the upper and lower halves of the vibrating plate being reversed with relation to said vertical center when at rest and in avertical position, but arranged to pass be tween the studs in the stationary plate when in motion, substantially as shown and described, for the object set forth.

2. In a revolving-hook lock-stitch sewingmachine, the combination of the vertical stationary plate a, central pivot, f, upper and lower sets of studs 0 c c c, centrally-pivoted IIO vibrating plate e, upper and lower sets of stitch-forming and tension mechanisms, substmls h h h h, all located between the stitchstantially as shown and described, for the 0bforming and tension mechanisms of the majecl: set forth.

chine, connecting-rod u, vertically-vibrating ROSEYVELL THOMPSON. 5 lever Z, peripheral path-cam 7c, and means Vibnesses:

for imparting motion to said devices, all con- H. A. THOMPSON,

sn'ucted and arranged to operate with said 1 CHAS. E. THOMPSON.

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