US1535942A - Looper-thread controller for sewing machines - Google Patents

Description

L. ONDERDONK LOOPER THREAD CONTROLLER FOR SEWING MACHINES April 28, 1925.

Filed Nov. 27, 1922 2 Sheets-Sheet" l April'28, 1925. 1,535,942

L. ONDERDONK LOOPEB THREAD CONTROLLER FOR SEWING MACHINES Filed Nov. 27, 1922 2 Sheets-Sheet 2 Patented Apr. 28, 1925.

UNITED STATES PATENT OFFICE.

LANSING ONDERYDONK, NEW YORK, N. Y., ASSIGNOR TO UNION SPEOIE L MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOOPER-THREAD CONTROLLER FOR SEWING IMACHINES.

Application filed November 27, 1922. Serial No. 603,504.

To all whom it may concern:

Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Looper- Thread Controllers for'Sewing Machines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in looper thread controllers for sewing machines, and more particularly to a thread controller for a looper mounted to oscillate in a horizontal plane.

an object of the invention is to provide a thread controller for a looper mechanism of the above type, which-thread controller is actuated directly from the looper and is given movements so as to take up slack during the first part of the forward movement of the looper, give up slack to the looper after it enters the needle thread loop and while it is moving to the forward end of its stroke, again take up slack on the first part of the retractingmovement of the looper until the needle is Well into the looper thread loop, and then take up slack while the looper is moving to the rear end of its stroke.

In the drawings Figure 1 is a bottom plan view of a portion of a sewing machine embodying my improvements Fig. 2 is a top plan view of the looper and the thread controller therefor;

Fig. 3 is a plan view showing the position of the parts when the looper is at the rear end of its stroke;

Fig. 1 is a similar view but with the looper at the point of entering the needle thread loop, and

Fig. 5 is a similar view but with the looper at the forward end of its stroke.

The sewing machine to which my invention is applied-includes a work support 1 of the usual construction having an open-' ing 2 at the side of the throat plate. Beneath the work support there is a bracket 3 in which is mounted a shaft 4 carrying a looper 5. The shaft 1 is provided with a laterally projecting arm to which a link 6 is connected, and this link 6 in turn is connected to a lever arm 7 pivoted at 8 to the under side of the work support 1. The lever arm 7 is oscillated by means of a link 9. As this link 9 is moved back and forth, the lever arm 7 and link 6 move into and out of alinement, and thus impart oscillations to the loo-per giving an extended dwell to the looper while the same is at the forward end of its stroke. This looper mechanism per se, forms no part of the present invention, but is shown, described and claimed in my prior Patent No. 1,123,578, granted January 5, 1915.

The present invention is directed to a thread controller for this horizontally moving looper which has an extended dwell at the forward end of its stroke; controller consists ofan oscillating arm 10 pivoted at 11 to the work support. The looper carrier isprovided with a laterally projecting arm 12 which of course, oscil The thread lates with the looper. A link 13 is pivoted at 14 to this laterally projecting arm 12 and is pivoted at 15 to the oscillating thread controlling arm 10. On the outer end of the arm 10 there is a thread eye 16. Se

cured to the under part'of the work support 1 isa thread eye 17. This thread eye 17 is secured to the work support by means of a screw 18. Thelooper thread-is indicated, at Z and passes from the supply through the thread eye 17, thence through the thread eye 16. and to the looper. As clearly shown in Figures 3 and 4 the link 13 and arm 12 are substantially in alinement when the point of the looper is entering the needle thread loop. Figure 5 shows the looper at the extreme forward end of its stroke and this arm and link have moved out of alinement and moved the thread controlling arm 10 to the left of the position shown in Fig. 2. As the looper retracts just as the point of the looper is leaving the needle thread loop, the link and arm again come into alinement, and as the looper moves to the rearend of its stroke, the arm and link move out of alinement as shown in Fig. 3, and again the thread co-nin Fig. 3 and moves toward the position shown in Fig. 4, the thread controlling arm will take up slack in the looper thread and thus avoid any slack thread forming in front of the looper which might buckle and cause the looper to miss the needle thread loop. As soon, however, as the looper reaches the needle thread loop and starts to enter the same, the thread controlling arm ceases its slack take up movements and begins to give up slack so that the looper has sufficient slack thread to move to the forward end of its stroke without any undue strain on the looper thread. As the looper begins its retracting movement, the thread controlling arm moves toward the position shown in Fig. 4, and will take up slack so that the looper thread is kept substantially taut until the point of the needle has well entered into the looper thread loop. After the needle thread loop has been shed from the looper, then the slack in the thread is taken up preparatory to the next forward movement of the looper. 'It will be noted that the thread controlling arm is operated from the looper, and only moves when the looper is i'noving, and therefore, when the looper is at the forward end of its stroke and at a dwell, the thread controlling arm will also be at a dwell. I have provided, therefore, a thread controlling mechanism which is substantially idle when the looper is at a dwell, which receives all its move ments from the looper and which has two 1 slack take-up movements to each complete oscillation of the looper.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of the invention as set forth in the appended claims.

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

1. The combination with a looper carrier mounted to oscillate back and forth, a looper mounted in said carrier, means for imparting oscillations to said looper carrier and giving an extended dwell thereto at the forward end of the stroke of the looper, an arm projecting from the carrier, a thread controlling lever mounted at one side of the looper to oscillate in a plane parallel with the plane of oscillation of the looper, a link connecting said thread controlling lever with the arm of the looper carrier, said arm and link being so disposed as to move into alinement when the point of the looper is entering or leaving the needle thread loop.

2. The combination with a looper mounted to oscillate back and forth in the same path and in a horizontal plane, means for imparting oscillations to said looper and giving an extended dwell thereto at the forward end of its stroke, an arm projecting from the carrier for the looper, a thread controlling lever mounted at one side of the looper to oscillate in a horizontal plane, a link connecting said thread controlling lever with the arm of the looper carrier, said arm and link being so disposed as to move into alinement when the point of the looper is entering or leaving the needle thread loop.

In testimony whereof, I affix my signatu re.

LANSING ONDERDONK.

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