US267038A - James teipp - Google Patents

Description

(No Model.) J. TRIPP.

TAKE-UP MEGHAN-ISMPOR SEWING MACHINES. No. 267,038. Patented Nov. 7, 1882.

WITNESSES: INVENTOR- BYw ATTORNEYS.

UNITED STATES PATENT OFFICE.

JAMES TRIPP, OF NEW YORK, N. Y.

TAKE-UP MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 267,038, dated November Application filed August 5, 1882. (No model.)

To all whom it may concern:

Be it known that I, JAMES TRIPP, a citizen of the United States, residingatNew York city, in the county and State of New York, have invented new and useful Improvements in the Take-up Mechanism of Sewing-Machine's, of which the following is a specification.

My invention relates to improvements in that partof sewing-machines which is commonly known as the take-up, and the object of my invention is to automatically regulate the take-up to accord with the varying thicknesses of material being sewed, and also to allow for sewing seams, laps, hems, &c., where an irregular and sudden increase or diminution of the thickness of material necessitates a variation in the amount of take-up in order to produce perfect work.

In carrying out my invention I mount on the presser-foot shaft, by preference within the head, a short arm, to'the outer end of which is pivoted a peculiarly-formed bent arm, which bears against and is operated by a frictionpulley mounted on the rear of the needle-bar. To the upper end of the bent arm is applied a friction-pulley, which engages with a curved spring-lever, which is pivoted at its lower end to the sewing-machine head, while at its upper end it is formed with a bent take-up portion, which oscillates through a semicircular slot in the back of the sewing-machine head.

The accompanying drawings form part of this specification, and illustrate what I consider the best means of carrying out theinvention.

Figure 1 is a detached view of the head of a sewing-machine with my improvements applied thereto. Fig. 2 is a vertical section on the line a: w of Fig. 1. Fig. 3 is a plan view. Figs. 4:, 5, 6, and 7 are detail views of parts.

Similar letters of reference indicate corresponding parts.

A represents the sewing-machine head. B is the presser-foot, and B the presscr-foot shaft, upon which is mounted, by means of a setscrew, b, the short arm 0, which is cut away, and has pivoted to it by means of a setscrew, 0, a bent arm, D, which-at d is bent into the form of a cam. The part at constantly rests against and is operated backward and allowed to come forward by means of a friction-pulley, e, mounted on the rear of the needle-bar E.

To the upper end of the bent arm D is applied a friction-pulley, d, which bears against the front edge of a curved lever, F, which at its lower end is pivoted, by means of a screw, f, to the sewing-machine head, and it is kept in contact with the pulley d by means of a spring,f, which at its lower end is fixed to the sewing-machine head, while at its upper end it engages with a short arm, F, formed on or affixed to the lever F. At its upper end the lever F is provided with a bent take-up portion, F adapted to engage with the thread G and draw it through the bent loop A affixed on the extension of the sewing-machine head.

The operation of the device is as follows: The machine being put into operation, the presser-foot B and presser-foot shaft B and the needle-bar E will be operated in the ordinary manner, and at each movement of the presser-foot B the arm 0 will be raised to a height regulated by the amount or thickness of material under the presser-foot B. Such raising of the arm O by the presser-foot B will raise the bent arm D, and thereby regulate the time at which the friction'pulley 6 (carried by the needle-bar) shall come into contact with the cam portion d of the bent arm D, thereby regulating the throw of the curved lever F, and consequently of the takeup portion F the time of the take-up, and consequently the length of thread taken up. It the material is thin, the arm G will be only slightly raised, and the take-up will be exercised to its full extent. It a seam or a greater thickness of material comes under the presserfoot, the arm G will be raised to a greater'height, and the bent arm D will be raised so as to retard the action of the pulley 0 (carried by the needle-bar E) on the bent arm F, and consequently the take-up portion F will have a smaller or shorter throw. It will thus be seen that the take-up will be automatically regulated according to the thickness or amount of material for the time under the presser-foot B.

Instead of using the friction-pulleys e d, it is obvious that I can employ studs or cam-projections.

Having thus described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. The con1bination,\vith the presser-foot and presser-foot bar of a' sewing-machine, of a bent or curved lever, D, provided with a cam portion, 01, adapted to be raised and lowered automatically by the presser-foot B and bar B from time to time into position to regulate the position of an arm or lever, 1*, carrying the take-up portion F and operated by a frictionpulley or an equivalent stud. or projection, 0, carried by the needle-bar E, substantially as and for the purposes set forth.

2. In combination with the presser-foot and presser-foot bar of a sewing-machine, an arm or bearing, 0, and a bent arm, D, pivoted thereto, and provided with a cam-surt'ace,d, of afi-iction-pulley, or an equivalent stud or projection, 0, carried by the needle-bar, and a bent or curved lever, F, formed at its upper end with a take-up portion, F, the bearing 0 and arm 1) being controlled in position by the presserfoot and bar, and controlling the length, time, and extent of the take-up, substantially as and for the purposes described.

3. The combination, With the presser-foot B and presser-foot bar B of a sewing-machine, of the arm 0 and the pivoted bent lever D, can] portion d, and friction-pulley d, of the needle-bar E, friction-pulley or equivalent stud or projection e, curved pivoted spring-lever Ff, take-up portion I, and loop A, substantially as and for the purpose described.

In witness whereof I have hereunto set my hand this 31st day of July, 1882.

JAMES TRIPP.

WVitnesses:

MAX BAYERSDOR-FER, WM. E. RICHARDS.

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