US1799666A

US1799666A - Thread-tensioning device

Info

Publication number: US1799666A
Application number: US348704A
Authority: US
Inventors: Wuertz Rudolph
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-03-21
Filing date: 1929-03-21
Publication date: 1931-04-07
Anticipated expiration: 1948-04-07

Description

April 7, 1931.- j R. WUERTZ 7 5 THREAD .TENSIONING DEVIGE Filed March 21, 1929 Hudam WuErz,

Juve f 01,

Patented Apr. 7, 1931 UNITED STATES RUDOLPH WUERTZ or READING; rENNsYLvANIA THREAn-TENsroNrNG DEVICE Application filed March 21', 1929. Serial No. 348304.

This invention relates to an improved means for tensioning the feedng threads or Fig. 1 is a view diagrammatically indicati ing the invention in connection with certain parts of a -straight knitting machine, the passing thread being shown as deflectedly engaged by different rings of the relatively enlarged tensioning device, so as to deterninedly tension the same, more or less as determined by the number of defiections thus pro- Vided; the manner of engaging or disengaging an additional spiral ring for varying the tension being indicated by a dotted-line showing of the thread.

F ig. 2 is a separate plan View of the spiralcoil tensioning device.

As diagrammatically indicated in Fig. 1, the thread from bobbin b, is drawn over a top bar 0 of the machine, in feedingly extending it to the thread carrier (l on carrier bar e and thence to the needles f; Intervening devices commonly provided are not indicated,

and the top bar c, as shown, is utilized for conveniently attaching my improved ten- 5 sioning device so as to arrange it in the path of the feeding thread; The essential purpose is to enable the operator to quickly and easily adjust the tension accurately a-s need develops, by merely looping` the running thread upon determined ones of the coilrings of the device as hereinafter fully described.

As indicated this tensioning device 'is simply formed from a single piece of spring wire; one end of 'which is bent to form a clip 11 adapted as shown to engage the machine bar c and resiliently hold the main portion 12 in the path of the thread. This main portion 12 is fol-med as a spiral coil having spaced-apart spiral rings 12 12' 12 which are alternately engaged the feeding yarn-;the spread of these rings, or the pitch ,of 'the spiral coil, being preferably varied to enable great nicety of'tension adjustment, as will` clearly appear from 'the differentts angular defiections of the thread thusefi'ected asshoWninFigl. i

The manner of engaging the running 'thread with each determinedring"of' the spiralcoil, is indicat-edin Fig.'"l in 'connec- 00 tion with the effecting of the added deflection of the bobbin thread which is indicated by the dotted-line showing;-the thread being merely carried under the spiral coil 12 and thrown over the top into engagement with (30. the adjacent spiral coil 12 so as to add the slight angular deflection under coil 12 which deflection slightly increases the tension provided by the similar engagements and defiections of the thread with closerp spaced rings 12 as indicated in the full line showing. i

The thread extending to the point of fabrication, is selectively engaged With any two or more of the rings 12 12 312 of the coil, as determined by the number and angles of the deflections required to efiect desired tension; the thread in each case being merely thrown past an intervening ring or rings into r engagement With an advanced ring as indicated, so that said intervening ring or rings i will deflect it from the straight line of the engaged rings, with a greater or less angle of deflection and resulting friction deter mined by the spread of the suecessively en- 35 i gaged rings. Thisvery simple method of efl'ecting required tensioning permits of varying the same with the great nicety and quickness required for practically satisfactory operation and quality of product. e

What Iclaim is:

1. A feeding-thread tensioning device consisting of a continuous length of wire one end of which is shaped to form a frame-engaging clip and the mainportion of which v is spirally coiled in the path of the feeding thread to deflectingly engage the latter substantially as described. e

2. A feeding-thread tensioning device consisting of a continuous length of wire one end 100 of which is shaped to form a frame-engaging clip' and the main portion of which is formed into a spira'l coil of varied ptch, said coil being arranged in the path of the feeding thread and adapted to' varyingly deflect separated engaging portions of the latter.

3. A feeding-thread tensioningdevice conssting of a continuous length of Wre one end of which is provided with a franre-engagng support and the main portion of which is formed into a spiral 'eoil adapted to freeiy eXtend from said support With its holloW aXis arranged in the path of the feeding thread and its convolutions adapted to, de-

fiectingy i engage the' letter.

"4. A feedng-thread tensionng device con sisting of a oontinuous length of Wire one end of .which is provided With a frame-engagng support and the main portion of which is iorrned into a spiral coil of Varied pitch adapted to freely extend from said support With its hollow aXs arranged in the path of the feedng thread and its co'nvolutions adapted to defietngly engage the latter.

, In testimony Whereof, 1 afiX ny signature. I

RUD OLPH `WUERTZ.