US1467897A - Take-up for sewing machines - Google Patents

Description

' J. KIEWICZ TAKE-UP FOR SEWING MACHINES Filed April 11 1922 2 Sheets-Sheet 1 InvenTo'r John Kiewicg by. M

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J. KIEWICZ TAKE-UP FOR SEWING MACHINES Filed April 11. 1922 2 Sheets-Sheet 2 Fig.2.

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John Kiewicg Aflys.

Patented Sept. 11, 1923.

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JOHN KIEWICZ, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BEECE BUTTON HOLE MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

TAKE-UP F011- SEWING MACHINES.

Application filed April 11, 1922. Serial No. 551,523.

To all whom it may concern:

Be it known that 1, JOHN KIEWIoZ, a citizen of the United States, and residing at Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Take-Ups. for Sewing Machines, ofwhich the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to sewing machines and particularly to take-up devices such as are used for taking up the needle thread to tighten each stitch.

One feature of the invention is. a novel take-up device having two take-updements which co-operate to take up the needle thread and which are arranged so that they perform their function with a relatively small amplitude of movement. The take-up herein shown is specially useful in connection with sewing machines adapted to operate at a high speed and also in connection with two-threadsewing machines that use a rotary hook and shuttle in connection with the under thread mechanism. In this type of sewing machine it is necessary to draw out from the needle a suitable length of thread to form a loop large enough to pass around the shuttle or bobbin and in order to tighten the stitch the take-up has to be constructed to take up a corresponding length of thread.

My improved take'up is constructed to handle this length of thread with a relatively small amplitude of movement in the moving parts and thus making a device specially adaptable for high speed work.

My improved take-up comprises two oscillat'or'y take-up elements which oscillate about different centers and which also oscillate in opposite directions thus dividing between them the total movement necessary to take up the desired length of needle thread at each stitch.

In order to give an understanding of the invention I have illustrated in the drawings a selected embodiment thereof which will now be described after which the novel features will be pointed out in the appended claims.

Fig. 1 is a side view of a sewing machine embodying my invention.

Fig. 2 is a front view thereof.

The sewing machine herein shown comprises a bed plate 1 on which the work is reciprocates the needle bar in a well known manner.

The shaft 7 is operated by any suitable connections from a drive shaft 8 and the latter is rotated from a pulley 9 fast thereon over which passes a driving belt not shown. 10 indicates a loose pulley associated with the fast pulley and onto which the driving belt is shifted when the machine is to be stopped.

The sewing machine herein shown is a two-thread sewing machine and the type employing a shuttle or bobbin carrying the under thread and a rotary hook for taking the loop of needle thread and casting it about the bobbin. The rotary hook and shuttle are indicated generally at 11 and the hook is driven from a shaft 12 which in turn is driven from a shaft 8 through suitable gearing 13. I

The parts thus far described are or may be all as usually found in sewing machines although the particular sewing machine in which said parts are embodied in the illustration is one similar to that shown in United States Patents No. 749,776, Jan. 19, 1904, N0. 1,088,652,Feb. 24., 191mm No.1,402,073, Jan. 3, 1922.

Inasmuch as the present invention relates to the take-up for the needle thread I have not thought it necessary to further illustrate or describe the sewing machine in general.

My improved take-up comprises two takeup levers 14 and 15, each having an eye 16 through which the needle thread 17 passes. The take-up lever 14 is shown as mounted on a stud 18 secured to the overhanging arm and it has rigid therewith an arm 19 which is connected by a link 20 with a camactuated lever 21 that is pivoted to the frame at 22. This lever has a follower 23 thereon operating in a cam groove 24 formed in a cam 25, the latter being driven by a suitable shaft 26 which is geared to and driven from the drive shaft 8 by any ap propriate mechanism.

With this arrangement the rotation of the cam 25 will oscillate the take-up lever 14 between the two dotted line positions shown inFig.2.

The take up lever 15 is pivoted to the head of the machine at 27 and it is connected to the take-up lever 1450 as to oscillate therewith but in an opposite direction thereto. The take-up lever 14 has an arm 28 extending therefrom and this arm is pivot ally connected to the take-up lever 15 by a link 29. i i

The construction is such that when the take-up lever 14; is moved upwardly the arm 28 which is at right angles to the lever 1 1 will be moving to the left Fig. 2 and will thereby move the take-uplever 15 to the left thus moving the endsof the levers away from each other. lVhen the take-up lever 14 is moved downwardly by the cam the take-up lever 15 will be moved in an opposite direction so that the two ends of the take-up levers will be moving toward each other. The mechanism for operating the take-up levers is so timed, with reference to the means for operating the needle that during the downward thrust of vthe needle and while the loop of needle thread is being drawn over the shuttle the two take-up levers 14:, 15 are moving in a direction to carry their ends toward each other thereby giving up slack in the needle thread '17. lVhen the loop of needle thread has been cast about the shuttle and the needle is rising, then the take-up levers move in theopposite direction o; as to separate the ends 16 thereof, such movement operating to take up the slack of the needlev thread. The

movement requisite for taking up the de ,sired length of thread is thus divided between the two take-up leversM and 15 and,

therefore, both levers have a shorter stroke or amplitude'of movement than would be necessary if the entire length of thread was taken up with a single take-up lever.

It will be noted that the levers have a crossing relation and that one is actuated from the other thus simplifying the con struction.

The sewing machine is threaded up by passing the-thread 17 through the tension 1 30 and over the guide 31 indicated in dotted lines, thence through the eye 16 ofthe take up lev'er15, thence through the eye 16 of the takeup lever 141- and thence to the needle 5.

I claim:

1. In a sewing machine, the combination with a vertically-reciprocating needle bar,

of two pivoted take-up levers each having an eye through which the needle thread passes, one lever extending in a general horizontal direction and having an arm extending laterally therefrom near its pivoted end and the other take-up lever extending in a general vertical direction and crossing the first-named lever, means to oscillate the first-named lever, and a link'connecting said laterally-extending arm of said firstnamed lever with the second lever.

2. In a sewing machine, the combination with a vertically-reciprocating needle bar,

of a pivoted take-up lever extending in a general horizontal direction and havingan eye at its free end and arranged so that when it oscillates the eye reciprocates ver- 'tically, a second take-up lever pivoted above the first-named take-up lever and depending from its pivotal point, said levers having a crossing relation between their pivotal points-and their eyes, means to oscillate one of said levers, and means for transmitting said second lever crossing the first-named lever and having an eye at its lower end which reciprocates 1n a horizontal direction, and a link connecting said depending lever to the arm of the first-named lever.

In testimony whereof, I have signed my name to this specification.

JOHN Kmwroz

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