US982547A - Pull-off mechanism for stitching-machines. - Google Patents

Description

H. THEISEN & G. S. KELLER.

PULL-OPP MECHANISM FOR STI'I'OHING MACHINES.

APPLICATION FILED MAY 13, 1909.

Patented Jan. 24, 1911.

m NORRIS FEfE UNITED STATES Parana OFFICE.

BRUNO H. THEISEN AND GEORGE S. KELLER, OF MINNEAPOLIS, MINNESOTA.

PULL-OFF MECHANISM FOR STITCHING-MACHINES.

To all whom it may concern:

Be it known that we, BRUNO I'I. TI-IEISEN and GEORGE S. KELLER, both of Minneapolis, Hennepin county, Minnesota, have invented certain new and useful Improvements in Pull-Off Mechanisms for Stitching-Machines, of which the following is a specification.

The object of our invention is to provide means for regulating the tension of a thread on a stitching machine, to the end that the amount of thread used in each stitch can be controlled.

The invention. consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a sectional view, illustrating the application of our invention to a stitching machine, Fig. 2 is a detail view, showing the mechanism, which controls the feed of the thread, Fig. 3 is a View, taken on a line, substantially at right angles to the sight line of Fig. 2, Fig. 4 is a detail view, illustrating the manner of running the thread from the reel to the work plate and putting the required tension thereon.

In the drawing, 2 re resents the frame of the machine, 3 a sha carrying a cam 4 7 adapted to engage an arm 5, mounted on a bracket 6, which projects from an oscillatin shaft 7. An arm 8 is carried by said shaft and is adapted to engage and oscillate a j aw 9, by the movement of which the work is fed through the machine.

10 represents the needle jaw and 11 is an arm, carrying a shuttle 12. These parts however, form the subject matter of separate applications for Letters Patent, Serial No. 495,742, filed May 13, 1909, and Serial No. 365,541, filed March 30, 1907.

Referring to Fig. 4, 13 represents a reel on which the thread is wound and from which the thread passes to the holes 14 and 15, provided in an arm 16, which projects from the frame 2. A lever 17 is pivoted at 18 on the frame, and carries a thread-engaging device 19, which as herein shown, is in the shape of a laterally projecting pin. The thread passes from the hole 15 in thearm 16 over the thread-engaging device or pin 19, through the hole 20 or thread guide; thence around and over the pin 19, and through the hole or thread guide 21 in the arm 16. A

Specification of Letters Patent.

Application filed May 13, 1909.

Patented Jan. 24, 1911.

Serial No. 495,740.

lever 22, as herein shown, is pivoted at 18 and at its free end cooperates with a cam 25. A spring 24 engages the lever 22 and normally holds the same in operative engagement with the cam 25. The lever 22 is provided with a projecting stud which is dis posed opposite a similar projecting stud on the lever 17, and a compression spring 23 engaging said studs, operates to separate the levers 22 and 17 The tension of said spring 23 is so proportioned that the normal tension on the thread, due to the movements of the needle and the feed of the material, will draw the thread-engaging device or pin 19 against the arm 16. As the cam 25 rotates, the lever 22 will be oscillated, and the sprin 23 compressed, which will cause the lever 17 to move outward, carrying the pin 19, over which the thread is laid outward away from the thread eyelets or holes 15, 20 and 21, in the arm 16, and thus pull up the needle thread. The outward movement of the arm 17 is limited by a stop screw 25, which has the usual lock nut. By adjusting the stop screw 25, the amount of take-up action on the needle thread is regulated. When it is desired to have the thread taut in the material, and a very tight stitch made, then the stop screw 25 is moved outward, so as to allow a longer throw of thelever 17. By moving the stop screw in, the .throw of the lever 17 will be shortened, and less thread taken up, thus making a looser stitch. It is obvious that the stop screw 25 may also be adjusted for varying lengths of feed, so as to make a stitch of any desired character. After leaving the pin 19, the thread is carried through a hole 26 in a pin 27 and from thence through tension devices 28, 29 and 30 to an oscillating hook tension 31 and to a wheel 32 carried by the arm 8, and from thence to a hole in the work plate 33. The thread is waxed and very strong and the series of tensions are for the purpose of keeping it drawn taut and insuring a close, tight stitch in the material. A wax pot 27 is carried by the lower end of the pin 27.

We claim as our invention 1. In a stitching machine, the combination of thread guides, an oscillating arm, a thread-engaging device carried by said arm, means for moving said arm to carry said thread-engaging device away from said thread guides to take up the thread, said means including an oscillating member, means for oscillating the same, a yielding part connecting said oscillating member'and said arm, whereby said thread-engaging device is yieldingly moved away from said thread guide, and an adjustable stop for engaging said arm for limiting the movement thereof away from said thread guide to vary the amount of thread taken up.

2. In a stitching machine, the combination of an oscillating member, means for operating the same, an oscillating arm supported independently of said member, a thread-engaging device carried by said arm, means including a yielding part for connecting said arm and said member, whereby said arm is moved by said member, and an adjustable stop jor limiting the movement of said oscillating arm.

3. In a stitching machine, the combination with a frame, a lever pivoted thereon, a thread engaging pin carried by said lever, a second lever pivoted to said frame, a cam for oscillating said second lever, a spring holding said second lever in engagement with said cam and a compression spring interposed between said levers whereby movement of said second named lever is imparted to said first named lever.

4. In a stitching machine, the combination with a frame, a lever pivoted thereon, a thread engaging pin carried by saidlever, a second lever mounted on the same pivotal support as said first named lever, a cam, a spring for holding said second lever in engagement with said cam, a compression spring interposed between said levers whereby the movements of the second lever are yieldingly imparted to the first named lever, and an adjustable stop located in the path of movement of said first named lever for limiting the movements thereof.

In witness whereof, we have hereunto set our hands this Qltll day of April 1909.

BRUNO H. THEISEN. GEORGE S. KELLER.

lVitnesses J nssm M. SULLIVAN, J. A. BYINGTON.

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