US3759299A - Warp tension device for looms - Google Patents

Abstract

The device comprises a compensating roller made in the form of a feed worm which in its cross section has the shape of a rhomb with rounded vertices. On either side of the roller there are mounted warp guide rods oriented relative to said roller so, that when the shed is crossed, formed between them is a compensation loop which is drawn out when the shed is fully open.

Description

United States Patent Selivanov et al.

[ 1 Sept. 18, 1973 WARP TENSION DEVICE FOR LOOMS Inventors: Anatoly Grigorievich Selivanov,

ulitsa Lobachecskogo, 44, kv. 59; Nikolai Ivanovich Makachev, ulitsa Tatischeva, l7, kv. 33; Maria Kuzminichna Parshina, ulitsa Tsjurupy, I2, korpus l, kv. 27, all of Moscow, USSR.

Filed: Jan. 6, 1972 Appl. N0.: 215,738

US. Cl. 139/97 Int. Cl. D03d 49/04, D03d 47/26 Field of Search 139/97, 98, I2, 24,

References Cited UNITED STATES PATENTS Rossmann 139/12 3,483,897 l2/l969 Pfarrwaller I39/98 2,649,864 8/I953 Mayer, Jr. et al. I39/97 2,932,325 4/1960 Patrick 139/97 FOREIGN PATENTS OR APPLICATIONS 1,237,034 6/1960 France 139/12 6,332 1905 Great Britain 134,418 9/l902 Germany 139/24 Primary Examiner-James-Kee Chi Attorney.l0hn G. Schwartz [57] ABSTRACT The device comprises a compensating roller made in the form of a feed worm which in its cross section has the shape of a rhomb with rounded vertices. On either side of the roller there are mounted warp guide rods oriented relative to said roller so, that when the shed is crossed, formed between them is a compensation loop which is drawn out when the shed is fully open.

4 Claims, 6 Drawing Figures PATENTEI] SE?! 8 I973 SHEET 1 0F 2 PATENTED SEP] 8 I975 SHEET 2 0F 2 WARP TENSION DEVICE FOR LOOMS The present invention relates to travelling wave shedding looms, and more precisely to warp tension devices employed in these looms.

This invention can be most advantageously used in travelling wave looms producing fabrics of various articles.

Known at present are warp tension devices, comprising shaft rods with healds for the passage of the warp threads, and a compensating roller located parallel to the shaft rods and having a surface which simulates the shed wave profile, and contacts the warp threads, to compensate for tension variations.

In said mechanism said roller is made sectional, and consists of an axle whereon collected are eccentric washers with collars shifted relative to each other (see, for example, a Swiss Pat. No. 455667, dated 1963).

In said devices, the roller made in the form of an axle with eccentric washers collected thereon does not permit regulating the tension of the warp threads, which is necessary when changing to another article of fabric to be produced; in the latter case the assembled roller must be replaced. Besides that, employment of the eccentric washers lengthens the friction distance for the warp threads.

It is an object of the present invention to eliminate the cited disadvantages.

An important object of the invention is to provide a warp tension device, that would permit manufacturing a wide variety of fabrics with required tension due to the possibility of regulating the warp threads tension, and would enable varying the profile of the shed wave formed by the warp threads.

With these and other objects in view, in a warp tension device for travelling wave shedding looms, comprising shaft rods with healds for the passage of the warp threads, and a compensating roller having a surface which simulates the profile of the shed wave and contacts the warp threads, to compensate for tension variations, according to the invention, the compensating roller is made in the form of a feed worm, the cross section of which has a rhombic shape with rounded ver tices whose radii are chosen so, that the worm surface contact the warp threads with minimum friction, and mounted on either side of the roller are warp guide rods capable of vertical displacement and oriented relative to said roller so, that when the shed is crossed, a compensation loop is formed between the rods and the roller, and when the shed is fully open the loop is drawn out.

Such a design permits producing a wide variety of fabrics due to the vertical displacement of the rods with respect to the roller, to change tension in the fabric forming zone. Besides, it will also enable reducing the path of friction of the warp threads against the elements of the compensator, and setting the required shed wave profile.

The screwed surface of the roller should advantageously be helically shaped. Such a surface shape of the roller is used with a smooth shed wave, since in this case the warp threads form a voluminous space for the shuttle to fit therein more freely.

The screwed surface of the roller may also have a stepped form. This makes possible advanced shed crossing, which is vital for a certain group of fabrics.

In said device, the guide rods can be capable of vertical displacement, to vary the warp tension. This is necessary to change warp tension when passing to another sort of fabric.

For a better appreciation of the invention, considered below is a particular illustrative embodiment thereof with references to the appended drawings, wherein:

FIG. I is the threading diagram of a travelling wave loom with the warp tension device according to the invention;

FIG. 2 shows a warp tension device with a stepped roller;

FIG. 3 is an enlarged view of the stepped roller in section;

FIG. 4 is section IV-IV in FIG. 2;

FIG. 5 shows another version of the warp tension device;

FIG. 6 is section VIVI in FIG. 5.

GENERAL DESCRIPTION OF THE WARP TENSION DEVICE DETAILED DESCRIPTION OF TI-IE DEVICE The compensating roller 4 is disposed parallel to the shaft rods 1, and is made in the form of a stepped feed worm 6 (FIGS. 2, 3) which in its cross section has a rhombic shape with rounded vertices a whose radii are chosen so, that the worm surface contact the warp threads with minimum friction. The worm surface simulates the profile of the shed wave and contacts the warp threads, to compensate for tension variations in these threads.

The stepped worm is formed by rhombic sections 7 which connect each other through partitions 8 wherebetween the warp threads 3 are drawn in.

Each section 7 is phase-shifted to an angle a, as is shown in FIG. 3, so that vertices a a a a of each section 7 form the shed wave conventionally shown in FIG. 2. The stepped worm 6 is mounted in bearings 9 and 10 which are placed on brackets 11, 12. The vertical displacement of the guide rods 5 (FIG. 4) is effected by means of screws 13 with shoulders 14 which rest against plates 15. These plates are attached to the housings of bearings 9 and 10. Rods 5 are oriented relative to roller 4 so, that when the shed is crossed, as is shown in FIG. 1, a compensation loop is formed between these rods and roller 4. When the shed is fully open, the loop is drawn out.

Shown in FIGS. 5 and 6 is another version of the compensating roller 4.

In this case the roller is made as a worm 16 which has a rhombic outline in its cross section, and whose surface is helically shaped as shown in FIG. 5.

OPERATION OF THE WARP TENSION DEVICE Before setting the device in operation, the travelling wave loom is threaded through. The warp threads 3 are drawn into healds 2 passing about the back rest 17 (FIG. 1). The required shed wave is set according to the article of fabric, the compensating roller being phased opposite to the shed wave.

The required tension of the warp threads 3 during the threading process is attained by displacing the guide rods 5 with respect to the compensating roller 4, which is done by turning screws 13 with shoulders 14.

As the shedding mechanism is in action and the shed is fully open, the compensation loops formed by the guide rods 5 and the rhombic-shaped roller 4 yield the required length of warp threads into the shedding zone, whereas when the shed is crossed the compensating roller 4 gathers the excess length of the warp threads required for the shedding process, the warp tension all across the shedding zone remaining constant. The rhombic-shaped roller enables the friction path of the warp threads to involve minimum friction, and most fully maintains permanence of warp tension in a travelling wave loom.

We claim:

1. A warp tension device for travelling wave shedding looms, comprising: shaft rods with healds for the passage of the warp threads; a compensating one-piece screwed roller located parallel to said shaft rods, and made in the form of a feed worm whose surface simulates the profile of the shed wave and contacts the warp formed between the rods and the worm, and when the shed is fully open the loop is drawn out, the length of said warp threads to be compensated being substantially increased and decreased dependent on the article of fabric to be produced, the friction path of the warp thread along said roller being substantially short and the load upon said roller being substantially small, said warp thread remaining free from being wedged.

2. A device as claimed in claim 1, wherein the screwed surface of the roller follows a smooth helix;

3. A device as claimed in claim 1, wherein the screwed surface of the roller has a stepped shape;

4. A device as claimed in claim 1, wherein the guide rods are capable of vertical displacement, to change tension of the warp threads.

Claims (4)

1. A warp tension device for travelling wave shedding looms, comprising: shaft rods with healds for the passage of the warp threads; a compensating one-piece screwed roller located parallel to said shaft rods, and made in the form of a feed worm whose surface simulates the profile of the shed wave and contacts the warp threads, to compensate for tension variations, said worm having in its cross section the shape of a rhomb with rounded vertices, the radii of which are chosen so that the worm surface contact the warp threads with minimum friction; warp guide rods mounted on either side of said roller, and oriented relative to this roller so, that when the shed is crossed a compensation loop is formed between the rods and the worm, and when the shed is fully open the loop is drawn out, the length of said warp threads to be compensated being substantially increased and decreased dependent on the article of fabric to be produced, the friction path of the warp thread along said roller being substantially short and the load upon said roller being substantially small, said warp thread remaining free from being wedged.

2. A device as claimed in claim 1, wherein the screwed surface of the roller follows a smooth helix;

3. A device as claimed in claim 1, wherein the screwed surface of the roller has a stepped shape;

4. A device as claimed in claim 1, wherein the guide rods are capable of vertical displacement, to change tension of the warp threads.

Images