US462398A - Take-up mechanism for sewing-machines - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1.

P. DIEHL.

TAKE-UP MEUHANISM FOR SEWING MACHINES. No. 462,398. Patented N0v.3, 1891.

WIT/VES'SES. M/VE/VTUH.

AT TURNEYI (No Model.) 3 Sheets-Sheet 2.

P. DIEHL. TAKE-UP MECHANISM FOR SEWING MACHINES.

No. 462,398. Patented Nov.3, 1891.

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TAKE-UP MECHANISM FOR SEWING MAGHINES.

No. 462,398. Patented Nov. 3, 1891.

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ATTORNEY.

UNITED STATES PATENT OFF CE.

PIIILIP DIEIIL, OF ELIZABETH, NEIV JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY OF NE JERSEY.

TAKE-UP MECHANISM FOR SEWING-MACHINES.

SFEGIFICATION forming part of Letters Patent No. 462,398, dated November 3, 1891.

Application filed June 23, 1891. Serial No. 397,221. (No model.)

T 60% whom, it may cancer/L:

Be it known that I, PHILIP DIEHL, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Take-Ups for. Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention has for its object to provide a ta ke-up for sewing-machines which may be operated by a rotating crank-pin and still be properly timed so as to let off the thread slowly and take it up quickly, thereby avoiding the use of a cam-operated take-up and the objectionable wear and friction incidental thereto, While securing all of the advantages thereof as to timing and positive action.

To this end my invention consists ofa bellcrank lever, one arm of which is jointed to a rotating crank-pin, the other arm of said 1ever being jointed at its angularportion to one end of a link, the other end of said link being connected with a stationary pivot-pin, all as will hereinafter be more fully set forth.

In the accompanying drawings,Figure 1 is a front elevation of a Singer sewing-machine with my improved take-up applied thereto, and with the cap or face-plate of the head removed. Fig. 2 is a view similar to Fig. 1, but with some of the parts in different positions. Fig. 3 is a front end view of the head of the machine, but with certain parts omitted. Fig. 4 is a side view of the machine, partly in section. Fig. 5 is aplan view of the head and forward part of the machine with the frame-work thereof in section. Figs. 6 to 11, inclusive, are detached detail views of parts constituting the take-up and its operating mechanism. Fig. 12 is a detail view illustrating a slight modification.

A denotes the work-plate, and B the bracket-arm, of an ordinary Singer sewing-machine. J ournaled in the upper portion of said bracket-arm is a driving-shaft 0, provided at its rear end with the usual fly and pulley wheel D, and having at its forward end a crank-disk E, provided with a crank-pin c, to which is connected a pitman f, which serves 50 to operate the needle-bar g. The crank-pin e, as herein shown, has an integral arm or extension e, provided with a second crank-pin e Pivoted on a pin h, secured in the forward end of the bracket-arm Bis a link i, to which is pivotally attached, at its angular or middle portion, a bell-crank lever 75, the lower arm of which is jointed to the crank-pin c and the upper arm of which extends outward and is provided at its free end with a threadreceiving eye It, the said upper arm thus forming the take'up proper.

By constructing the take'np lever in the form of a bell-crank lever and inountingit on alink connected to the stationary part of the machine and then operating it by. a rotating erankpin, the said take-up lever is given a peculiar movement in that it moves bodily up and down with the swinging end of the link by which it is carried, and it is also vibrated on its pivotal connection with said Fig. 3 the take-up lever is descending bodily.

Fig. 3 represents the take-up-operating crankpin at its lower position, from which pointit begins to move upward, but in doing so it causes the take-up lever to vibrate on its central pivotal connection with the link, and thus while the operating crank-pin has commenced sults thatl am able to secure a properly-timed take-up lever, which will let off the thread slowly during the time the needle-bar is descending and while the shuttle is passing through the loop of needle-thread, and which will then quickly perform its take-up movement to tighten the stitch before the eye of the needle again enters the fabric. Moreover, the positions of the parts are such that at the moment when the stitch is being tightened the take-up-operating crank-pin is passing over the upper part of the circle in which it rotates, and the lower arm of the take-up is nearly vertical. The take-up is at this moment therefore being vibrated on its pivotal connection with the link, thereby affordinga strong leverage, so that any desired strength of pull on the thread is afforded without strain on the running parts of the machine. It will thus be apparent that by the simple mechanisin above described I am enabled to provide a suitably-timed takeup, which is operated from a rotating crank-pin, and whichis therefore well adapted to high speeds as it may be operated with comparatively little power and friction.

The timing of the take-up movements may be varied to adapt my improved take-up for operation in connection with different forms of lower stitch-forming mechanisms from the oscillating shuttle 8, herein shown, simply by varying the relative position of the stationary pivot to which the link is secured, by changing the length of the lower arm of the takenp, or by changing the position of the takeup-operating crank-pin.

Although I have herein shown a secondary crank-pin for operating my improved take-up in its particular relation to the shuttle mechanism of a Singer oscillating-shuttle sewing-machine, it will be understood that this secondary crank-pin may not be necessary with some other machines, but that the same crank-pin by which the needle-bar pitman is operated may also serve to operate the takeup, as is shown in Fig. 12, andI do not, therefore, wish to be understood as limiting my invention to the specific arrangement and proportions of parts herein illustrated.

I claim and desire to secure by Letters Patent 1. A sewing-machine take-up mechanism consisting of a bell-crank lever, one arm of which is provided with a thread-eye, and a link which is pivoted at one end to a stationary part of the machine, and to the other end. of which the central orangular portion of said bell-crank lever is jointed, combined with a rotating crank-pin to which the other or lower arm of the said bell-crank lever is connected.

2.In a sewing-machine, the combination, with a rotating crank provided with a secondary or offset crank-pin, of a needle-bar operated by the first-named crank, a bell-cranklever take-up operated by said secondary or offset crankpin, and a link one end of which is connected to a stationary part of the machine, and to the other end of which the angular or central portion of said take-up leveris pivoted, substantially as set forth.

In testimony whereof Iaftix my signature in presence of two Witnesses.

PHILIP DIEHL. Witnesses:

L. B. MILLER, FRIEDERICH MULLER.

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