US982234A - Thread-lock for sewing-machines. - Google Patents

Description

W.- R. BLAIR.

THREAD LOCK FOB. SEWING HAC Patented Jan. 24,'191.

I Y LYLIULTIDB FILED JUNE 24, lfl. 989,234.

' consists in the construction, arrangement after-"pointed out in the claims.

Bisslidahly mounted' a member 4 having a PANY, OF ST. LOUIS, MISSOURI,

' THREAD-LOCK FOR SEWIIQ'G-LIACHINBS.

ing is a full, clear, and exact description,

l' f such as will enable others sla'iled in the art `to which it appertains to make and use the 10- same, reference being had to the accompany- -ving drawines, forming part ofthis specifi cation, in w lich-'1 f thread locking or tension device in position t i- '1-5 to release the thread. F 1g. 2 is a sectional Yelevation ofthe thread tension shown 1n F ig. l, looking inthe direction of the arrow.

- Fig. 8 is a Vfrapnnentary View of the-tension i device in position to lock the thread. Fig.

i 2O #-1 is a View in elevation of the tension device -with operating means. Fig. 5 is a detail view showing the thread locking jaws. v

This invention relates to. a new and iml proved thread Vlocking or tension device,

425-which may be applied to any type of mai i chine and it is especially adapted for use in connection with. wax thread sewing niachines ofthe well known type. Y i

The object of my present invention is to i 30 improve the old type of tension devices by i constructing the jaws 'with op osing curved surfaces so as to form a lcink 1n the thread,

and thereby produce-a more positive lock.

vIt is. a further object of my inventionto 'g 35 operate the clamping jaws from a cam conf nected to the take-up device.

With these objects in View my invention.

and combination of the Various parts of rny 1Q device, nsare herein described f- In the drawings, 1 indicates arecessed A Aboss' on theframe of the machine, a portion jof the interior of which is threaded as in` 45 dicated bynumeral. -I'Yithin'the opening `s pindle 5 attached thereto. V'Screwed within the boss 1 is an adjustable nut 6 with nurl 'headLthisnut being hollow to allow the pas- ""'5 0 sage'of the spindle 5.' Y Lying between the end ofthe nut G and theshoulder 8 formed between the union of the part,- 4 with the spindle-5 isfahelical springt) surrounding f the spindle. At the lower Vend of the mem- "j i55 ber f1 a c am portionf1'. -..Afoove this cnm i unrrnn sfrafrns earner Sermon; i

WILLIAM R. BLAIR, OF ST. LOUIS, MISSOURI, ASSIGNOR TO LANDES MACHINE COM- Specification of Letters Patent.

Application led Inne 24, 1910. Serial No. 588,731.

Vthe clamping surface for a -thread when vLito correspond withthe curi'ature'of the Y 'Figure l is a side sectional viewof the and through the member-20 over guide roll l As the lever 19 is moved into a position,

i of the arms 20 and''l, and simultaneously 5 and there? i 12 of the thread tension device-4 so thatthe AVspring 9 acts to push the'jaw surface 13.

11. B 4forming the surfaces 13 and- 15- asf reverseylcurvedvthe threadclarnpedthere tension is more positive. V:By the adjust` ment of the-screwby the nurl head 'fthe f 'can be made and subStitutedor thoselieref il l A CORPORATION 0F MISSOURI.

Patented Jan. 2, 1911.

formed surface 12 the member is made to torm two surfaces 13 and 14, the surface 13' 1 heilig reversely curved and serving to form locked. Mounted in the frame 1 is a pin member 10,v having ancnlarged head or anvil 11, extending between the. surfaces. 13 and l of the member 4, and curved on .its 'top surface 65 Q surface 13 on the member al. The lower sur- Y l face ofthe head 1l is spaced sui'iiciently ronr the surface 11 of 'the member' to alow.. this member'to be mov-eilte sepan-ite the surfaces '13 and 15 without engaging the'm surface 14. The pin member 10 between ,the part extending into the frame 1 and the head 11 isshouldered as at 1'( 'to itthe corre-. spending groove 16 in thc member 4.' Pivoted on the stud 18 in the frame'of-the 75 machine below" the .tension device is. the ordinary' take-up lever 19 having the thread engaging ends 20 and Q1. Blounted on a stud 2l is a camv 25 which is connected through a link 23 with a stud 22 on the so lever 19. The thread extends from an eyelet :26 on the frame l through the tension lock 2T, and through the arm' 21 to the wax pot of the machine. The eyelet 26, tension lock, arms 20 and 21 and the guide roll 27 are so arranged that the thread passes in a sub stantially straight line throughv these elements. The operation of the device is as follows;

shownin dotted lines in Fig. 4the thread'issV pulled through the wax pot by the action i the cam 25 is moved away from the surface 951-. 'i'

downward to clamp the threadbetwecn this surface and the jaw snrfacel of the anvil between is deflected, or kinked, so. that the i! pressure' exerted by the spring 9 may be 105 am aware thatrninor changes in thecoiif struction and arrangement and' combination of the various parts ofmy improved -devlce Qns.

uio.

-rnise said yoke-shaped member.

. A tension device, comprising a pin in slmwnnntl described, Without departing from the nature :1nd splrxt of my invention.

This tension device muy also he used in other connections und on machines other than sewing machines.

I clnini:

l. )t tension device, comprising a pin member 'mounted in the frame of the 1nnchine and formed at one end with a head d1' anvil having a thread engaging surface, a yoke-shaped nieniber surrounding the anvil and having a thread engaging surface op posed to that'. on the anvil, and means to member mounted in the frame ofthe mibV chine and formed at one end with a head or A. :uml*having a thi-eno engaging surface,

and a spring actuated yoke-shuped member snrwnnding the 'anvil-and having :t thread engaging surface oppose@` to that. on the 3. Inj combination, atake-up lever, an irlclependently mounted cam, a. link connecting said lever and cam, n tension' clamp lia-fing emperntivej thread engaging curved surfaces, and arranged to be released by the el. In u machine, a frame work, pin fixed thereto and projecting laterally therefrom having :in enlarged head or anvil, :i memher slidably mounted in an opening in the Vtrarne work aboe the pin, and adapted `to coi'xpclntc with the anvil lo form :1 clump, und n .spring acting upon Said slidably mounted member.

5. lu :i machine, n frame woz-lc. n pin projecting laterally therefrom having nn enlarged bend or anvil, n sliflably mounted.

oke-sln11 ied member, said yoke portion einiucing t ie head or anvil of the pin.

6. In a Lachine, a frame work, a. pin prof jeeting laterally therefrom having :in en 4o Y l largecl head or anvil, a slidably mounted yoke-shaped member, said yolzepoi'tion einbracing the head or nnil of the pin, un oscillatory cani adapted to engage the lower.

end ofthe slidably mounted member, and means to actuate said earn.

'l'. In n machine, n frame Work, a pin pro-* jecting laterally therefrom having an enlarged head or anvil', aslidnbly mounted" vyoke-shapedniernber said yoke'portion'em-- bracing theliead or anvil of the pin, an

'oscillatory cam adapted toengage the lower end ofv the, slidably mounted member, .a tulle. up lever, ond-means connecting said cam and take-up lever to actunte said com;

In testimony whereof I hereunto aix myf' signature 1n the presence ot two witnesses,

this 21st clay of June, 1910.

i WILLIAM n. Bnltmlf Vitnessesf n l M. P.- SMITH, v

J. W. Curr.

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