US3924820A

US3924820A - Arrangement for equalizing the tension of two supplied threads

Info

Publication number: US3924820A
Application number: US467665A
Authority: US
Inventors: Stanislav Kovar; Jiri Cernocky; Petr Riha
Original assignee: Zbrojovka Vsetin np
Current assignee: Zbrojovka Vsetin np
Priority date: 1973-05-07
Filing date: 1974-05-07
Publication date: 1975-12-09
Anticipated expiration: 1992-12-09
Also published as: IT1010446B; ES426064A1; JPS50123971A; FR2228870B1; DE2421748A1; DE2421748C2; GB1465764A; FR2228870A1; JPS5710218B2; CH573349A5; CS161196B1

Abstract

First and second threads, the tensions of which must be equalized, are fed to their place of processing from respective first and second storage bobbins provided with braking discs over rotating rollers situated on a bridge capable of oscillation. The increased pull of the first thread in case of an increased tension therein causes the bridge to be displaced, whereby a larger braking force is generated for taking off the second thread from its respective bobbin, and the braking force for the first bobbin is reduced.

Description

United States Patent [1 1 Kovar et al.

[451 Dec. 9, 1975 ARRANGEMENT FOR EQUALIZING THE FOREIGN PATENTS OR APPLICATIONS TENSION OF Two SUPPLIED ADS 1,062,299 7/1959 Germany 242/156 [75] Inventors: Stanislav Kovar; Jiri Cemocky; Petr Riha, all of Vsetin, Czechoslovakia [73] Assignee: Zbrojovka Vsetin, narodni podnik, Primary Exammer stanley Gllreath Vsetin, Czechoslovakia [22] Filed: May 7, 1974 ABS CT [21] Appl. No.: 467,665

First and second threads, the tensions of which must be e ualized are fed to their lace of rocessin from 30 F q r P P orelgn Apphcauon i Data respective first and second storage bobbins provided May 7, 1973 Czechoslovakia 3230-73 with braking discs Over rotating rollers situated on a bridge capable of oscillation. The increased pull of the [g2] }I.S. Cll 242/156, 242/156.2 first thread in Case of an increased tension therein Flilt. C causes the to be displaced whereby a larger [5 leld of Search 242/156, 156.2, 42, 75.4, braking force is generated for taking Off the second 242/75'41 7543 thread from its respective bobbin, and the braking d. References Cited force for the first bobbin 1S reduce UNITED STATES PATENTS 4 Claim, 3 Drawing Figures 3,089,665 5/1963 Gardner, Jr 242/156 a fa 4 I l l l l I l l I I I l l 1 I US. Patent Dec. 9, 1975 Sheet 1 of2 3,924,820

\l ll LAX/MAW l. M $1M US. Patent Dec. 9, 1975 Sheet 2 of2 3,924,820

ARRANGEMENT FOR EQUALIZING THE TENSION OF TWO SUPPLIED THREADS BACKGROUND OF THE INVENTION The invention relates to an arrangement for equalizing the tension of two supplied threads and is particularly suitable for use in apparatus for supplying binding threads to a device for reinforcing the borders of a fabric by a leno weave.

In most of the arrangements for reinforcing the borders of a fabric by leno threads the tension of each binding thread is adjusted individually. The adjustment of two compensation means in order to achieve an equal tension of both binding threads is rather difficult and depends substantially on the feel and the experience of the attendant. The requirement of an equal relative tension of both binding threads is a major require; ment in the course of forming a leno weave, and the quality of the binding of the border of the fabric and its appearance depend thereon. An unequal tension of binding threads causes also their unequal consumption.

SUMMARY OF THE INVENTION It is an object of this invention to provide an arrangement which automatically equalizes the relative tensions of both supplied threads, thus enabling a better binding of the border of the fabric and improving the quality of the fabric. It is another object to provide an arrangement which is simple and easy to manufacture.

The arrangement according to this invention has two bobbins, supported on rotatable center rods arranged on a supporting disc, the bobbins being connected to the brake disc pins inserted into the faces of braking discs. When the binding threads are taken off from the bobbins, the bobbins, and therefore also the binding threads, are braked by wires encompassing the respective braking disc and disposed in circumferential grooves therein. The first ends of both wires are together anchored on a hook shaped arm of a lever, the other arm of which cooperates by way of a neck formed on a screw head with oscillatable bridge. A guiding roller is arranged on the bridge on each side of an imaginary straight direction of both binding threads in a distance differing at the place of contact of the binding threads with the guiding rollers from the distance of both binding threads at their imaginary straight direction toward the outlet eyelets. The oscillating bridge is supported on at least two flat springs to move within a plane parallel with both planes in which the threads move in the course of their passage around the guiding and drawing-in rollers. A pull spring is inserted between one end of each wire and its anchor thereby securing a constant tension of the wire.

The major advantage of the arrangement for equalizing the tension of two binding threads according to this invention is that it secures an equal relative tension of one thread with respect to the second thread, securing thus a better binding and quality of the border of the fabric. The space required for housing the compensation means is relatively small. The whole arrangement is simple and is easy to manufacture.

DESCRIPTION OF THE DRAWINGS An exemplary embodiment of the object of this invention is shown in the attached drawing, wherein:

FIG. 1 is an elevation in partial section of the arrangement of the invention showing the guiding of the binding threads from the bobbins to the outlet eyelets;

FIG. 2 is a plan view of the whole arrangement; and

FIG. 3 is a view partially in section and partially in elevation of the rotatable support of a bobbin, the section being taken along line 3-3 in FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT An exemplary embodiment of the object of the invention is shown in the attached drawing, wherein the arrangement of the invention comprises a disc 1 supporting rotatable braking discs 2 and 3. As shown in FIG. 3, a rod 4 is inserted in the braking disc 2 to support and guide the bobbin 6, the bobbin and rod with the braking disc 2 being supported in antifriction bearings and turning together when taking off the binding thread 7. A pin 5 connects the bobbin 6 to the braking disc 2 to insure their joint rotation. The second bobbin 8 carrying binding thread 9 is similarly constructed and supported.

A wire 11 encompasses a part of the circumference of the braking disc 2 lying in a groove 10 therein, the wire 11 is fixed at one of its ends to a hook shaped arm 12 of a lever 20, and is connected at its other end with a coil tension spring 13, which is suspended on a hook 14 of an adjustable anchoring means 15 provided with a position adjusting set screw 16 and a fastening screw 17. A wire 18 is similarly arranged on the braking disc 3, and is anchored at one end. on a hook 14 and connected at its other end to a coil tension spring 19 which is suspended on the hook shaped arm 12 of the lever 20. Lever 20 in turn is pivotally supported on a stub shaft 21 fixed on the supporting disc 1.

The second arm 22 of the lever 20 forms a fork, engaging into the neck 23 of the head of the screw 24, by means of which the end of a flat spring 26 is tightened to the bridge 27 through a washer 25, a second flat spring 28 being fixed to the bridge 27 by a screw 29 and washer on its opposite side. The lower ends of the

flat springs

26 and 28 are fixed to a strap piece 30 by screws 31. The strap piece 30 is firmly connected with the supporting disc 1 by screws 32. A holder 34 for

thread guiding eyelet

35 and 36 is fixed at the center of the upper surface of the bridge 27 by a screw 33.

Guiding rollers

37 and 38 are provided on the opposite sides of the bridge 27, both rollers being rotatably supported on

stub shafts

39 and 40 fixed to the bridge 7. Rollers 41 and 42 for drawing-in the

binding threads

7 and 9 to the outlet eyelets 43 and 44 are also rotatably supported on each side of the strap plate 30.

The

binding threads

7 and 9, which are supplied by the

feeding eyelets

35 and 36 from

bobbins

6 and 8, are brought to the circumference of guiding

rollers

37 and 38 and further guided to the circumference of the drawing-in rollers 41 and 42 by means of which they are drawn to the outlet eyelets 43 and 44, from which they are taken off and brought to the working site.

The arrangement operates so that in case of an increase of tension of one of the binding threads, for instance, of thread 9 on bobbin 8, the bridge 27 supported on delicate

flat springs

26 and 28 deviates due to the increased pull of the binding thread 9 on the guiding roller 37 to the right, thus causing the head of the screw 24 with the neck 23 also to move to the right, thereby turning the fork of the arm 22 of the lever 20. Thus the hook-shaped arm 12 of the lever 20 is also turned, reducing the pull upon the wire 18 and accordingly reducing the braking force which brakes the bobbin 8, thereby causing a reduction of the tension of the binding thread 9. Since the wire 11 for braking the bobbin 6 carrying the binding thread 7 is fixed on the same hook-shaped arm 12 of the lever 20, the tension in wire 11 increases in case of the deviation of the hookshaped arm 12 to the right, thereby increasing the braking force imposed upon bobbin 6 and increasing the tension of the binding thread 7. The tensions of both

binding threads

7 and 9 are quickly equalized and maintained at relatively equal values. This fully satisfies those cases wherein it is required that the difference of tensions of two binding threads should be a minimum, even if the resulting tension of the two threads varies, as it is the case, for instance in the application of a leno weave for reinforcing the border of a fabric.

The arrangement according to this invention can be applied to cases where an equal relative tension of two threads is required, and is particularly suitable for reinforcing of borders of fabrics by a leno weave.

Although the invention is illustrated and described with reference to one preferred embodiment thereof, it is to be expressly understood that it is in no way limited by the disclosure of such a preferred embodiment, but is capable of numerous modifications within the scope of the appended claims.

What is claimed is:

1. Arrangement for equalizing the tension of two supplied threads taken off from individual bobbins, comprising in combination a frame, two thread-carrying bobbins rotatably supported on the frame, a grooved braking disc affixed to each bobbin, braking wires received within the grooves of the respective bobbins, an-

choring means for one end of each braking wire affixed to the frame, a two-arm lever rotatably supported on the frame, one arm of said lever serving as an anchoring means for the second ends of both braking wires, a tension spring inserted in one end of each braking wire, a bridge supported for oscillation on the frame, a guiding roller for each thread on opposite sides of said bridge, a drawing-in roller for each thread on a support affixed to the frame, outlet eyelets for the thread fixed on the said support, and means pivotally connecting the bridge to the second arm of the lever so that turning of the lever in one direction by the movement of the bridge in a first direction increases the braking effect of a first wire on the braking disc of the first bobbin while decreasing the braking effect of the second wire on the braking disc of its respective bobbin, and turning of the lever in the other direction by the movement of the bridge in a second direction increases the braking effect of the second wire on the braking disc of the second bobbin while decreasing the braking effect of the first wire upon the braking disc of the first bobbin.

2. Arrangement as in claim 1, wherein the means affixed to the frame for anchoring said one end of each braking wire include means for adjusting the tension in said braking wires.

3. Arrangement as in claim 1, wherein the oscillating bridge is supported on the frame by mounting means including springs, said mounting allowing a deviation of the oscillating bridge in a plane parallel with the planes in which the taken-off threads move when passing the guiding rollers and the drawing-in rollers.

4. Arrangements as in claim 3, wherein the mounting means includes at least two flat springs.

Claims

1. Arrangement for equalizing the tension of two supplied threads taken off from individual bobbins, comprising in combination a frame, two thread-carrying bobbins rotatably supported on the frame, a grooved braking disc affixed to each bobbin, braking wires received within the grooves of the respective bobbins, anchoring means for one end of each braking wire affixed to the frame, a two-arm lever rotatably supported on the frame, one arm of said lever serving as an anchoring means for the second ends of both braking wires, a tension spring inserted in one end of each braking wire, a bridge supported for oscillation on the frame, a guiding roller for each thread on opposite sides of said bridge, a drawing-in roller for each thread on a support affixed to the frame, outlet eyelets for the thread fixed on the said support, and means pivotally connecting the bridge to the second arm of the lever so that turning of the lever in one direction by the movement of the bridge in a first direction increases the braking effect of a first wire on the braking disc of the first bobbin while decreasing the braking effect of the second wire on the braking disc of its respective bobbin, and turning of the lever in the other direction by the movement of the bridge in a second direction increases the braking effect of the second wire on the braking disc of the second bobbin while decreasing the braking effect of the first wire upon the braking disc of the first bobbin.