US2201015A - Yarn brake - Google Patents

Description

H. SCHLICK May 14, 1946.

YARN BRAKE vFiled oct. 1. 1957 2 sheets-sheet 1 H. SCHLICK `YARN BRAKE May m w40.

2 sheets-shee't 2 Filed Oct. 1, 19157 INVENTOR.

HELL MUT 6CH/ MK i.; ATTORNEY 'Patented May 14, 1940 UNITED STATES PATENT OFFICE 8 Claims.

My invention relates to a yarn brake for textile machines, and more particularly to a yarn brake having a stationary member and a pivotal mem-'- ber associated therewith, in which each of said members is provided with a plurality of spaced gripping elements and the gripping elements of the two members interengage each other to form a braking passage for the yarn. Yarn brakes of above described type are especially adapted for lo use in creeis; the yarns of the bobbins carried by the creel pass through the braking passage of the yarn brakes when they are warped on the beam of a warping or beaming machine.

One object of my invention is to provide a yarn brake of above described type, which is very sensitive and permits extremely high travelling speeds of the yarn without causing a breakage ci the yarn.

n further object of my invention is to provide go a yarn brake of above described type, which is very sensitive and does not tend to vibrate.

Another object of my invention is to `provide a yarn brake of above described type, which has a high eiiciency and maintains a uniform ten- 25 sion of the yarn at various speeds.

in order to carry out my invention into practice l provide a yarn brake comprising a stationary member, a pivoted member associated with said stationary member, each of said members carry- 30 ing a plurality of spaced gripping elements, the gripping elements of the stationary member and the gripping elements of the pivoted member interengaging each other and forming a braking passage for the yarn, the center of gravity of the 35 pivoted member being so related to its pivot that it tondo to cause tno gripping elements of the pivoted member to swing toward the gripping elements of the stationary member tocause a pressure on the yarn, and a dampening dash-pot fio arrangement connected' to said pivoted member for dampening the vibrations of said pivoted member caused by the passing yarn.

The above mentioned objects and advantages as well as other objects and advantages will be i5 moro muy disclosed in the fouowing specification reference being had to the accompanying drawings forming a part of this specification, in .yhlch:v i v Fig. 1 is a perspective view of the yarn brake, Fig. 2 is a fragmentary view of the gripping elements of the members of the yarn brake,

Fig. 3 is a perspective view of the yarn brake,

partly Vin section; some parts of the yarn brake 55 being omitted or being broken away for a better illustration of the dampening dash-pot arrangement, Y

Fig. 4 is a fragmentary view of the yarn brake illustrating the funnel-shaped inlet as seen in the direction oi arrow A of Fig. l,

Fig. 5 is a cross-sectional view of the yarn brake taken on line 5-5 of Fig. 4,

Fig. 6 is a fragmentary end view of a yarn` brake provided with a different embodiment lof a dash-pot arrangement,

Fig. 'i is a perspective vview of the yarn brake similar to that shown in Fig. 3, in which, huwever. the yarn brake is equipped with an additional adjustable load in form of a spring,

, Fig. is a fragmentary view of a yarn brake similar to that shown in Fig. 6, in which, however, the yarn brake is equipped with an adjust able load in form of a weight, and

Fig. 9 is a diagrammatic side end view of a creei with a plurality of yarn brakes and a single controlling member for the simultaneous adjustment of the adjustable loads arranged on said yarn brakes.

Referring to the drawings, i represents one of the rods, which are providedin the creci for the attachment of the yarn brakes or stretching devices. Each yarn brake is mounted on a holder or support 2, which may consist for instance of metal. The brake proper comprises a stationary part 3 provided with a plurality of spaced gripping elements or fingers 3', the shape of which will be seen from Figure 2, and a movable part t provided with a plurality of gripping elements or lingers t'. Both parts may consist of porcelain. The gripping elements t' of the stationary member 3 and the gripping elements 6 of the pivotal member 6 interengage each other and form a braking passage for the yarn 1. The swingable part is mounted between arms 5 and of the holder 2. The yarn 1 passes through the substantially horizontal braking passage between the stationary lingers 3' and the swngable part 6 carrying fingers 6', that is to say it is unwound from the bobbin (not shown) and enters the inlet opening of a funnel 8 which is formed integrally with the part 3. The center of gravity of the'pivotal member 6 is so related to its pivot that it causes an automatic pressure on the yarn 1. The funnel has a length of about 5 centimeters so that the balloon of the yarn cannot get entangled with the brake. The axis of the funnel-shaped inlet extends inl horizontal` 9 by which it is turned by 90. In order to insert the thread between the -fingers 3 and 6', the

' fingers are opened as shown in Figure 2 in dotted lines. The outlet eyelet I is formed open so that the yarn has to be threaded only into the opening 8 when it is inserted into the brake.

The dash-pot arrangement for damping the v oscillations of the movable or swingable part 3 ment is shown in Figure 6, according to which blades I5 are mounted on the pivot Il of the member G. The blades I5 are movable in a container I'I that is lled with a liquid, for instance oil, whereby a good damping of the oscillations of the member 6 is effected.

In the embodiments of the yarn brakes shown in Figs. 1-6, the pivotal member 6 with its gripping elements bears against the yarn under its own weight for causing the braking effect. In some cases, however, for example if less sensitive yarn passes through the brake, it may be desirable to produce an additional pressure on the yarn by means of a separate load acting on the pivotal member 6. Such a separate load may be a spring I8 stretched between the rod I2a of the dash-pot arrangement and an arm 23 as shown in Fig. 7, or it may be a weight I9 arrangedon the extension IIa of the pivot II as shown in Fig. 8. When the arm 23 (Fig. 7) is stationary or the weight I9 (Fig. 8) is immovably mounted on the extension of the pivot Il, the additional load cannot be adjusted.

Where it is intended to cha'nge the tension ofr all braking devices of a creel at the same time, the arms 23 of the brakes according to Fig '7 may be mounted on the common regulating rod 20. If the regulating rod is upwardly or downwardly moved, all of the springs I8 are stretched or relaxed simultaneously. By connecting all of the regulating rods of the creel together it is possible to regulate all yarn brakes from a common regulating point. For example, Fig. 9 diagrammatically Aillustrates the arrangement of a plurality of yarn brakes 40 in a creel 4I carrying the bobbins 42. All of the brakes are mounted on the vertical rods I of the creel and are equipped with above described additional loads in form of a spring I8 as shown in Fig. '7. Each vertical column of yarn brakes has a. single regulating rod 20 connected to all springs of the brakes of the respective column, and all the regulating rods 20 are operatively connected to a single controlling shaft 43 by means of cams 44 secured to the shait 43 and engaged with the hubs o f the arms 23. A rotation of the shaft 43 by means of the lever 45 in either direction causes a simultaneous lifting or lowering of all regulating rodsI 20 in the creel, so that the tension of the springs I8 of all yarn brakes in the creel is changed at the same time.

Brakes of the kind shown in Figure 8 may be commonly regulated in such a way that the weights I9 are displaceably arranged on the bent portion Ila of the shaft II. The guiding pin 24 of the weight I9 is slidably engaged with a slot of the regulating member 22 secured to the regulating rod 2l. By movement of the regulating rod in either direction of the arrow b, the weight I9 may be shifted on the extention Ila for changing the pressure caused by the iingers 6 on the yarn. If desired, the regulating rods 2i of all yarn brakes in a creel may be operatively connected to a single controlling member, so that the weight of all brakes may be adjusted at the same time by a movement of said controlling member. For this purpose, an arrangement similar to that shown in Fig. 9 may be used.

I prefer to make all parts of my novel brake round or to cover them in order to prevent the passing threads from being caughtby parts of the device.

A very important advantage of my novel brake resides in the fact that the speed of the warping machine can be considerably increased without breakage of the yarn. Practice has shown that even in case of a drawing or unwinding speed of 1000 meters vper minute, a thread of artificial silk had a tension of only 16 grams when my novel brake was inserted, while with the known yarn brakes the thread showed tensions up to 300 grams already at drawing speeds of 400 meters per minute so that the thread breaks very frequently. My novel brake ensures reliable working up to very high unwinding or drawing speeds.

While I have herein shown and described certain preferred embodiments of my invention, I wish it to be understood that I do not conne myself to all the precise details herein set forth by way of illustration, as modification and variation may be made without departing from the spirit of the invention or exceeding the scope of the appended claims.

Having now described my invention what I claim is:

1. A yarn brake for textile machines, comprising a stationary member, a pivoted member associated with said stationary member, each of said members carrying a plurality of spaced gripping elements, the gripping elements of the stationary member and the gripping elements of the pivoted member interengaging each other and forming a braking passage for the yarn, the center of gravity of the pivoted member being so relatedto its pivot that it tends to cause the gripping elements of the pivoted member to swing toward the gripping elements of the stationary member to cause a pressure on the yarn, and a dampening dash-pot arrangement connected to said pivoted member for dampening the vibrations of said pivoted member caused by the passing yarn.

2. A yarn brake as claimed in claim 1, the` sociated with said stationary member, each of said members carrying a plurality of spaced gripping elements, the gripping elements of the stationary member and the gripping elements of the pivoted member interengaging each other and forming a braking passage for the yarn, the center of gravity of the pivoted member being so related to its pivot that it tends to cause the gripping elements of the pivoted member to swing toward the gripping elements of the stationary member to cause a. pressure on the yarn, a funnelshaped inlet associated with said stationary member, the axis of said funnel-shaped inlet being substantially at aright angle to the axis of said braking passage, and a dampening dast-pot arrangement connected to said pivoted member for dampening the vibrations of said pivoted member caused by the passing yarn.

4. A yarn brake as claimed in claim 3, in which the axes of said funnel-shaped inlet and of said braking passage extend in horizontal direction.'

5. A yarn brake as claimed in 'claim 1, a s'eparate load being connected to said pivoted member for pressing its gripping elements against the yarn.

6. A yarn brake as claimed in claim 1, an adjustable load being associated with said pivoted Vmember for pressingk its gripping elements against the yarn. i

7. A yarn brake arrangement for textile machines comprising a. plurality of individual yarn brakes as claimed in claim 1, adjustable loads being associated with the pivoted member of each individual yam brake, and controlling means, said controlling means being operatively `connected to all adjustabler loads of the individual yarn brakes for a simultaneous adjustment thereof.

8. A yarn brake for textile machines, comprising a stationary member carrying a series of spaced gripping elements, a pvoted member associated with said stationary member, said pivoted member including a shaft, a sw'lngable arm and a series of spaced gripping elements, the gripping elements of the stationary member and the gripping elements of the pivoted member alternately'interengaging each other and forming a substantially horizontal braking passage for the yarn, the shaft of the pivoted member being substantially parallel to said braking passage for the yarn, a separate load being connected to said pivoted member for causing the gripping elements of the pivoted member to swing toward the gripping elements oi the stationary member to cause a pressure on the yarn,

and a dampening dash-pot arrangement connected to the said arm of the said pivoted member for dampening the vibrations of said pivoted 20 member caused by the passing yarn.

HELLMUT SCHLICK.

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