US739158A - Take-up device for sewing-machines. - Google Patents

Description

No. 739,158. PATENTBD SEPT. 15. 1903. P. DIBHL & M. HEMLEB. TAKE-UP DEVICE FOR SBWING'MAGHINES.

APPLICATION FILED APR. 8, 1903.

N0 MODEL.

wvawto'w; Wa JM @31 9 cw/14mg UNITED STATES Patented September 15, 1903.

PATENT OFFICE.

PH LIP DIEHL AND MARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, As

SIGNORS TO THE SINGER MANUFACTURING COMPANY, A ooRPoRA- TION OF NEW JERSEY.

TAKE-UP DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 739,158, dated September 15,1903.

Application filed April 8, 1903. Serial No. 151,564. (No model.) i

To all whom it may concern.-

MARTIN HEMLEB, both citizens of the United States, residing at Elizabeth, in the countyof Union and State of New Jersey, have invented certain new and useful Improvements in Rotary Take-Up Devices for Sewing-Machines, of which the following is a'specification, reference being had therein to the accompanying drawings.

This invention relates to an improvement in rotary take-up'devices for sewing-machines, and more particularly to an improvement on. the thread-guard device shown and-described in United States Patent No. 705,328, granted July 22, 1902. The thread-guard device of the said patent, as also the thread-guard device of the-present invention, serves to withdraw the loose end of the needle-thread from the rotary take-up should the thread accidentally be broken between the tension device and the work, thus unthreading the rotary take-up and preventing entanglement of the thread therewith during the time which may elapse after the thread has been broken and before the machine is stopped. The thread-guardof the said patent was so constructed and arranged that so far as concerned its operation as an unthreading device it was out of the normal path of the thread acted on by the rotaryt-ake-up, although it was so arranged that the thread was momentarily in contact therewith at each rotation of the take-up. Such momentary contact of the thread with the said unthreading-guard at each rotation of the take-up has, howevergbeen found to be objectionable with some kinds of thread, which are liable to stick slightly on or to have so much friction against the guard as to somewhat interfere with or slightly retard the initial cast-E or threadslackening action of the take-up; and the present improvement has for its object to obviate this possibly occurring difficulty. To this end the unthreading take-up guard of the present invention is arranged entirely out of the normal path of the thread when the machine is sewing properly; and itconsists, preferably, of a segmental rib or flange on the face-plate of the machine between the inner and outer ends of the rotary take-up ,2, and 3 are front views of the head of a sewing-machine embodying the present invention with the parts in different positions in the different views. Fig. 4 is a side View of the same with the stationary encircling guard in section. Fig. 5 is a detail plan view showing the unthreading-guai'd and part of the stationary ring or guard encircling the path of the rotary take-up arm.

Referring ,to the drawings, 12 denotesthe head at the forward end of the bracket-arm of the machine, and 13 the face-plate secured to said head. The take-up shaft 14: is preferably mounted in a suitable bearing in the face-plate and is rotated from the needlebar-operating shaft in any suitable manner, but preferably by the means fully shown and described in United States Patent No. 705,327, granted July 22, 1902. Connected tothe shaft 14 to ,rotate therewith is a take- 8 up arm 15, preferably consisting of two separated plates or parts, between which is mounted a thread-detaining lever 18, oper ated from a stationary cam, as fully shown and described in United States Patent No. 705,221, of July 22, 1902, said take-up arm being provided between its inner and outer ends with a thread-controlling shoulder 16, which momentarily detains the thread in the cast-off or thread-slackeningoperation. The ake-up arm 15 is provided at its outer end with a 'forwardlyeprojecting finger-17,

and said outer end of said take-up armis overlapped by a hollow stationary guardring 20, which encircles the path of movement ofthe take-up arm and which circular 'not herein specifically claimed.

IOO

Formed integral with or attached to the face-plate 13 is the unthreading-guard 2l, consisting,preferably,of a segmental or semicircular rib or flange arranged on the castoif or thread-slackening side of the path of movement of the rotary take-up arm. The forward part of the upper end of the said unthreading-guard and which end is first approached by the rotary take-up .arm is provided with a point or finger 22, on which the thread when accidentally broken between the take-up and the work will catch without being further severed, so that the broken thread will be wound upon or around the said segmental guard by the rotating take-up and will thus be instantly withdrawn or unthreaded from said take-up arm, so that entanglement of the thread with said rotating take-up arm will be entirely avoided'at such times as the take-up may continue to rotate after the thread breaks. The segmental unthreadingguard of the presentinventionis entirely out of the normal path of the thread running from the tension device 23 to the needle, so that in the proper operation of the machine the thread as normally controlled will not come into contact at all with said unthreading -guard; but should the thread break and the loose end thus become slack such slack loose thread is instantly caught by 'the point or finger 22 at the first rotation of the take-up arm which occurs after the thread is broken, and the thread when thus caught by said point or finger will be withdrawn from the rotary take-up during the first complete rotation which occurs after the thread is thus caught by said point or finger. This operation is illustrated in Fig. 2, in which the thread running from behind the point or finger 22 of the unthreading-guard 21 to the dotted-line position of the rotary take-up arm 15 and extending thence outward (see dotted line) by centrifugal action is beginning to be wound on the guard 21 by the rotary take-up arm, so that by the time said take-up arm has reached the position shown in full lines in Fig. 2 the thread will have been withdrawn from said arm and will fall down to the position in which the thread is as far as possible shown in full lines in said figure.

By arranging the unthreading segmental guard rib or flange entirely on the cast-E or thread-slackening side or part of the circular path of movement of the rotary take-up arm and by providing the forward end of said guard, or the end thereof first approached by the rotary take-up arm or part, with a th readcatchingpoint orfinger any objectionable contact of the thread with said guard is in the normal operation of the machine entirely avoided, while the thread-catching point or finger insures the quick unthreading of the loose end of thread from the rotary take-up when the thread is accidentally broken.

Having thus described our invention, we claim and desire to secure by Letters Patent- 1. In a sewing-machine, the combination with a rotary take-up, of a stationary support, an unthreading device on said support and arranged wholly on the cast-01f or threadslackening side of the path of movement of the said rotary take-up, said device being so located that the thread has no contact therewith except when broken, the said unthreading device being adapted to catch, without severing, the loose end of an accidentallybroken thread, as said loose end is carried around, and thus withdraw such loose end of thread from the said rotary take-up.

2. In a sewing-machine, the combination with a rotary take-up, of a stationary unthreading device on the face-plate of the machine and arranged and operating out of the normal path of the thread and wholly on the cast-01f or thread-slackening side of the path of movement of the said rotary take-up, and which device is so located that the thread has no contact therewith except when broken, the said unthreading device being adapted to catch, without severing, the loose end of an accidentally-broken thread, as said loose end is carried around, and thus withdraw such loose end of thread from the said rotary take-up. v

3. In a sewing-machine, the combination with a rotary take-up, of a stationary, segmental uuthreading device on the face-plate of the machine and arranged and operating out of the normal path of the thread and wholly on the cast-011 or thread-slackening side of the path of movement of the said rotary take-up, the said unthreading device being adapted to catch, without severing, the loose end of an accidentally-broken thread, as said loose end is carried around, and thus withdraw such loose end of thread from the said rotary take-up.

4. In a sewing-machine, the combination with a rotary take-up arm, of a stationary, segmental unthreading device located adjacent to the path of movement of the said take-up arm and between the innerand outer ends thereof, said segmental unthreading device having at its forward end, or the end first approached by said take-up arm, a point or finger to catch the loose thread when the latter is accidentally broken.

5. In a sewing-machine, the combination with a rotary take-up arm, of a stationary segmental unthreading device located adjacent to the path of movement of the said take-up arm andbetween the inner and outer ends thereof, said segmental unthreading device being on the face-plate of the machine and having at its forward end, or the end first approached by said take-up arm, a point or finger to catch the loose thread when the latter is accidentally broken.

6. In a sewing-machine, the combination with a rotary take-up arm, of a stationary segmental unthreading device located adjacent to the path of movement of the said take-up arm and between the inner and outer ends thereof, said segmental unthreading de- In testimony whereof We affix our sigma- Vice being on the face-plate of the machine, tures in presence of two witnesses.

and wholly on the cast-0E or thread-slackening side of the path of movement of said ro- 5 tary take-up arm, and having at its forward end, or the end first approached by said take- Witnesses: up arm, a point or finger to catch the loose H. J. MILLER, thread when the latter is accidentallybroken. H. A. KORNEMANN.

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