US3719975A - Arrangement for eliminating distortions of weft threads in fabric - Google Patents

Abstract

An arrangement to eliminate distortions of weft threads in fabric, comprising a roller passed about by the fabric and freely rotating on an axle, which roller and axle consist in their length of at least two parts connected to each other by a hinge, and rest therethrough on a support, while the free outer ends of these parts are hinged in appropriate supports, that are made mutually displaceable in case of distortions, so as to swing the roller and thus change the length of the distance travelled by different sections of one and the same distorted weft thread, thereby eliminating the distortions.

Description

United States Patent 1191 Illarionov et al.

ARRANGEMENT FOR ELIMINATING DISTORTIONS OF WEFT THREADS IN FABRIC Inventors: Velizary Semenovich lllarionov; Vadim Alexeevich Kostin, both of lvanovo, U.S.S.R.

Ivanovsky Nauchno-Issledovatelsky Experimentalno Konstruktorsky Mashinostroitelny Institut, lvanovo, U.S.S.R.

Filed: June 11, 1970 Appl. No.: 45,352

Assignee:

u.s. c1. ..26/51.3, 26/51.5, 26/63, 226/21 rm. c1. ,.D06h 3/12 Field of Search ..26/51.3, 51.4, 51.5, 63, 65, 26/66, 67; 226/21, 22, 23

References Cited UNITED STATES PATENTS 920,122 5/1909 Farnworth ..26/63 X 2,024,618 12/1935 Whiting ..26/63 X 1,645,036 Ill/I927 Bacon ..26/63 Primary ExaminerRobert R. Mackey Attorney-Waters, Roditi, Schwartz & Nissen [57] ABSTRACT An arrangement to eliminate distortions of weft threads in fabric, comprising a roller passed about by the fabric and freely rotating on an axle, which roller and axle consist in their length of at least two parts connected to each other by a hinge, and rest therethrough on a support, while the free outer ends of these parts are hinged in appropriate supports, that are made mutually displaceable in case of distortions, so as to swing the roller and thus change the length of the distance travelled by different sections of one and the same distorted weft thread, thereby eliminating the distortions.

2 Claims, 2 Drawing Figures ARRANGEMENT FOR ELIMINATING DISTORTIONS F WEFT THREADS IN FABRIC The present invention relates to apparatus for eliminating weft thread distortions, and more particularly to apparatus for the elimination of weft thread distortions that are employed in fabric dressing equipment, for example, in sizing machines before the drying drums, or in the dressing and finishing sections before the stretching machines, etc.

One of the requirements of fabric is the perpendicularity of the weft threads with respect to the warp.

In the process of fabric manufacture and dressing the perpendicularity is often disturbed, i.e., the weft threads become distorted with respect to the warp threads.

The types of distortions are quite diverse, however, in the overwhelming majority of cases all the distortions can be reduced to three principal types: diagonal distortion (the weft thread follows a straight line, though not perpendicular to the warp), arc distortion (the weft thread follows an arc), and combined distortion, i.e., a combination of the two said distortions.

Known in the art are arrangements for eliminating weft thread distortions, comprising one or several rotating cylindrical rollers passed about by the fabric, these rollers being mounted on axles whose ends are hinged to supports that are mutually displaced in case of weft thread distortion, so as to swivel the rollers and thus change the length of the distance travelled by different sections of one and the same distorted weft thread (see, for example, West German Pat. No. 1020299, cl. 8b/l4, dated 1958).

These arrangements permit diagonal distortions.

To obviate arc and combined distortions of weft thread this arrangement needs additional rollers with an are surface to be installed.

However, additional rollers complicate the design of the arrangement, and involve added tension in the fabric, which stretches it.

An object of the invention is to devise an arrangement for eliminating weft thread distortions with such a design of the roller, in which compensation can be obtained for diagonal, arc, and combined distortions.

With this object in view, in an arrangement comprising a rotating roller passed about by the fabric, which roller is mounted on an axle whose ends are hinged to supports that are mutually displaced in case of weft thread distortion, so 'as to swing the roller and thus change the length of the distance travelled by different sections of one and the same distorted weft thread, the roller and the axle in their length, according to the invention, consist of at least two separate parts, said parts of the axle being hinge-jointed to each other, and this joint rests on an additional support located between the main supports.

The additional support in the arrangement is preferably offset relative to the main supports in the direction of the fabric section moving off the roller. This helps to prevent fabric slipping to the additional support, and reduces creasing thereof while thread distortions are being eliminated.

For a better explanation of the invention, the following is a description of a particular exemplary embodiment thereof with reference to following the appended drawing, wherein:

eliminating only FIG. 1 is a front view which shows the arrangement according to the invention and,

FIG. 2 is a section taken on line II II of FIG. I.

The arrangement to eliminate weft thread distortions in fabric comprises rotating rolls 1 and 2 (FIG. 1) conveying fabric 3, and roller 4 located between rolls 1 and 2, and freely turning on axle 5.

Roller 4 in its length consists of two separate rotary parts 6 and 7. Axle 5 also consists in length of two separate parts 8 and 9.

The inner ends of parts 8 and 9 are connected to each other through a hinge 10 resting on a retaining means in the form of an additional support 11.

The free outer ends of parts 8 and 9 are connected to supports 12 and 13, respectively.

Each of supports 12 and 13 consists of a nut 14 (FIG. 2), wherein the free inner end of each of parts 8 and 9 of axle 5 is hinged.

Each nut 14 is fitted on a guide screw 15, which is rotated by an electric motor 16 through a reduction gear 17.

In case of weft thread distortion, nuts 14 move along guide screws 15, thereby swinging parts 6 and 7 of roller 4 about hinge 10 in order to change the length covered by different sections of one and the same distorted weft thread.

To prevent slipping of fabric 3 toward support 11, and'to reduce creasing of this fabric while eliminating weft thread distortions, support 11 is offset relative to nuts 14 by a distance I in the direction of section 18 of fabric 3 that runs off roller 4.

The value of l is determined on the one hand by the absence of slipping of fabric 3 towards hinge 10 and minimum creasing in eliminating distortions, and on the other hand by minimum displacement of fabric 3 along roller 4, and maximum value of the distortion to be eliminated.

In case of no weft thread distortion, parts 6 and 7 of roller 4 are in the middle position, the different sections of one and the same weft thread of fabric 3 travelling equal distances between rolls 1 and 2.

In the case of, e.g., diagonal distortion (line A in FIG. 1), which is checked visually or by sensing elements (not shown in the drawing), motors 16 are switched on to rotate guide screws 15 through reduction gears 17, so, that nut 14, part 9 of axle 5 together with the rotary part 7 of roller 4, moves rightward (see arrow B in FIG. 2) to a distance determined by the value of the distortion being eliminated. The other nut 14, part 8 of axle 5 with the rotary part 6 of roller 4, moves an equal distance in reverse direction.

Movement of nuts 14 causes swinging of the respective parts 6 and 7 of roller 4 about hinge 10 to an angle determined by the value of the weft thread distortion being eliminated.

With such a disposition of the parts of roller 4, the advanced sections of the distorted weft threads of the right half (as in FIG. 1) of fabric 3 will travel a longer distance between rolls 1 and 2, as compared to the middle section of fabric 3. The sections of the left half of the fabric will correspondingly cover a shorter distance, as compared to the middle section. As a result, the (diagonal) distortions of the fabric weft threads are eliminated.

If the diagonal distortion has a reverse direction, nuts 14 move in the opposite direction, thus swinging parts 6 and 7 of roller 4 about hinge 10 to the other side.

In case of an arc distortion of the weft threads, which is convex in the direction of movement of fabric 3 (fabric movement is conventionally shown by arrow C), nuts 14 are simultaneously moved in one direction opposite to that shown by arrow B (FIG. 2).

In this case parts 6 and 7 of roller 4 swing about hinge so, that between parts 8 and 9 of axle 5, an internal angle of less than 180 is formed. This results in the weft thread sections located nearer to the edges of fabric 3 travelling shorter distances between rolls 1 and 2, as compared to the middle section of the fabric. As a consequence, the arc distortion is eliminated. If the arc distortion is convex opposite the movement of fabric 3, nuts 14 move simultaneously in one direction conventionally shown by arrow B (FIG. 2). In this case each part 6 and 7 of roller 4 swings about hinge 10 to an angle a determined by the value of arc distortion so, that the weft thread sections located nearer to the edges of fabric 3 cover longer distances between rolls 1 and 2, as compared to the fabric middle section. Thus, said are distortion is eliminated.

In the case of combined distortion, parts 6 and 7 of roller 4 are set in positions intermediate with respect to those described above, and corresponding to the values of the arc and diagonal distortions making up the combined distortion.

The described arrangement allows partial or complete elimination of a distortion of tight selvage type, i.e., a distortion when weft thread is curved only near the edge of the fabric.

This is also remedied by locating both or one of parts 6 and 7 of roller 4 in accordance with the value of distortion.

Usually the process of compensating weft thread v distortions is accompanied by fabric creasing, which may cause defects in the form of so called wrinkles. In the proposed arrangement roller 4 performs a spreading action on the fabric because of the displacement of hinge 10 with respect to nuts 14 to a distance I in the direction of section 18 of fabric 3 that runs off roller 4.

Thus, the possibility of fabric creasing is significantly reduced or completely excluded.

What we claim is:

1. Apparatus for eliminating weft thread distortions in fabric, said apparatus comprising: two spaced rotating rolls for conveying the fabric: an axle mounted between said rolls and having a freely rotating roller thereon, about which the fabric is passed, said roller and axle respectively including two separate sections, a hinge joining said sections at opposite free inner ends thereof to permit relative pivotal movement therebetween; a retaining means supporting said hinge; a displaceable support pivotably supporting the outer free end of the axle of each section, means for translationally moving said supports independently of one another to translationally move the outer ends of the axles of the respective sections and thereby cause independent pivotal movement of the sections about said hinge to compensate for thread distortion; said supports being individually displaceable to swing the sections of said roller about said hinge to change the length of the distance travelled by different sections of one and the same distorted weft thread.

2. Apparatus as claimed in claim 1 wherein the retaining means is offset relative to the supports in the direction of the fabric section that runs off the roller.

Claims (2)

1. Apparatus for eliminating weft thread distortions in fabric, said apparatus comprising: two spaced rotating rolls for conveying the fabric: an axle mounted between said rolls and having a freely rotating roller thereon, about which the fabric is passed, said roller and axle respectively including two separate sections, a hinge joining said sections at opposite free inner ends thereof to permit relative pivotal movement therebetween; a retaining means supporting said hinge; a displaceable support pivotably supporting the outer free end of the axle of each section, means for translationally moving said supports independently of one another to translationally move the outer ends of the axles of the respective sections and thereby cause independent pivotal movement of the sections about said hinge to compensate for thread distortion; said supports being individually displaceable to swing the sections of said roller about said hinge to change the length of the distance travelled by different sections of one and the same distorted weft thread.

1. Apparatus for eliminating weft thread distortions in fabric, said apparatus comprising: two spaced rotating rolls for conveying the fabric: an axle mounted between said rolls and having a freely rotating roller thereon, about which the fabric is passed, said roller and axle respectively including two separate sections, a hinge joining said sections at opposite free inner ends thereof to permit relative pivotal movement therebetween; a retaining means supporting said hinge; a displaceable support pivotably supporting the outer free end of the axle of each section, means for translationally moving said supports independently of one another to translationally move the outer ends of the axles of the respective sections and thereby cause independent pivotal movement of the sections about said hinge to compensate for thread distortion; said supports being individually displaceable to swing the sections of said roller about said hinge to change the length of the distance travelled by different sections of one and the same distorted weft thread.

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