A device for preventing gear faults during starting of rapier loom

Abstract

A device for preventing start-up faults in a rapier loom, the device comprising a cloth support assembly and a cloth guiding assembly arranged in sequence from front to back; the cloth support assembly comprises a cloth support base with a transversely arranged dovetail groove processed on the top surface, a cloth support base installed in a dovetail groove processed on the cloth support base through a dovetail arranged on the bottom surface and cooperating with the dovetail groove, and an oblique rhombus-shaped spacer installed in the dovetail groove for adjusting the front-to-back distance between the front cloth support edge and the reed; a longitudinally arranged strip through-hole is processed on the rear part of the cloth support base, the cloth support base is fixedly connected to the cloth support base by a fastening screw installed in the strip through-hole and a locking block of a frustum-shaped structure with an internal threaded connecting hole cooperating with the dovetail groove; the cloth guiding assembly comprises an expanding roller which is driven by a power mechanism to rotate and is arranged close to the top of the winding roller; the expanding roller is passed around by the cloth bag, and the angle between the line of the woven cloth being led away from the loom and the horizontal line is maintained at 1 degree.

Description

Technical Field

[0001] The present invention relates to a textile machine, in particular to a device for preventing blocking when a rapier loom is weaving sparse fabrics which are sensitive to uniform eyelets. Background Art

[0002] In conventional rapier looms, a steel reed is fixed to the sley. Warp yarns are threaded between the reed teeth. The warp yarns are moved up and down by the heald frame to form the upper and lower warp yarns, forming the shed. The sley swings back and forth. When the sley moves away from the cloth-feed, the weft yarn is drawn into the shed formed by the upper and lower warp yarns. As the sley moves toward the cloth-feed, the steel reed pushes the weft yarn toward the cloth-feed, while the upper warp yarn moves downward and the lower warp yarn moves upward, completing the interweaving process. The warp and weft yarns are then interwoven into the fabric at the cloth-feed. The loom's take-up roller guides the finished fabric away from the cloth-feed. The area from the weft yarn just beaten to the cloth-feed until it reaches the point where it no longer experiences relative movement due to the beating, affecting the warp and weft yarns' mutual bending is called the fabric formation zone. Fabric structural stability does not end with the single beating; relative movement of the weft and warp yarns continues within the fabric formation zone, some distance from the cloth-feed. The weft yarn in the fabric-forming zone has not yet achieved a defined fabric structure. The rapier loom's support rail plays a key role in stabilizing the cloth-fell position. Generally, the minimum clearance between the front edge of the support rail and the reed is 2 mm. This ensures a stable cloth-fell position without compromising the fabric structure when weaving dense, compact fabrics.

[0003] The rapier loom weaves sparse fabrics that are sensitive to uniform eyelet. The eyelet range is 10 to 30 meshes. The surface of the yarn of this fabric is relatively smooth, and the eyelet structure woven is unstable before it is finalized. It will be deformed if scratched by external objects, and the basic requirement of uniform eyelet cannot be met.

[0004] During the normal weaving process of a rapier loom for a sparse fabric that is sensitive to mesh uniformity, the woven fabric passes continuously in one direction through the front edge of the cloth support, and its mesh structure remains stable. However, if warp or weft breakage occurs, the loom has an automatic movement to compensate for the cloth fell. The loom will move forward and backward slowly, and the cloth surface will automatically move back and forth. At this time, when the minimum gap between the front edge of the loom cloth support and the reed is 2 mm, the front edge of the loom cloth support will have a back and forth effect on the weft yarns in the fabric formation area at the cloth fell. The minimum gap between the front edge of the loom cloth support and the reed is 2 mm. The front edge of the loom cloth support will push several unstable weft yarns at the cloth fell out of their normal position, destroying the fabric structure and affecting the uniformity of the cloth mesh. At the same time, the route by which the loom winds up the woven fabric away from the weaving mouth forms an angle of about 13 degrees with the horizontal line, creating a large fold line on the fabric surface at the front edge of the cloth support, which increases the strength of the front edge of the cloth support on the weft yarn. The weft yarn is pulled out of its normal position, and after the loom is started, it will form a fault on the fabric surface. Therefore, the gap between the front edge of the cloth support and the reed on the general rapier loom is 2 mm, which limits the applicability of the loom. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for preventing the starting gear defect of a rapier loom in view of the above-mentioned deficiencies in the prior art.

[0006] The purpose of the present invention can be achieved by the following technical measures:

[0007] The device for preventing the start-up fault of a rapier loom according to the present invention comprises a cloth supporting assembly and a cloth guiding assembly which are arranged in sequence from front to back, and is characterized in that: the cloth supporting assembly comprises a cloth supporting base with a transversely arranged dovetail groove processed on the top surface, a cloth supporting base installed in the dovetail groove processed on the cloth supporting base support through a dovetail arranged on the bottom surface and cooperating with the dovetail groove, and an oblique rhombus-shaped spacer installed in the dovetail groove for adjusting the front and rear distance between the front cloth supporting edge and the reed; a longitudinally arranged strip through-hole is processed on the rear part of the cloth supporting base, and the cloth supporting base is fixedly connected to the cloth supporting base by a fastening screw installed in the strip through-hole and a locking block of a frustum-shaped structure with an internal threaded connecting hole which cooperates with the dovetail groove; the cloth guiding assembly comprises an expansion roller which is driven by a power mechanism to rotate and is arranged close to the top of the winding roller; the expansion roller is passed around by the cloth cloth, and the angle between the line of the woven cloth being led away from the loom and the horizontal line is maintained at 1 degree.

[0008] The oblique diamond-shaped spacer can be placed in two different positions within the dovetail groove connecting the fabric support and support base of a rapier loom. When placed in the first working position (at the rear of the support) where the dovetail groove and support base meet, the minimum clearance between the front edge of the fabric support and the reed is 2 mm. When placed in the second working position (at the front of the support), the minimum clearance between the front edge of the fabric support and the reed is 6 mm. Ensure that the clearance between the front edge of the fabric support and the reed meets the required dimensions.

[0009] Furthermore, the oblique diamond-shaped spacer is installed at the front of the cloth support platform (the second working position), and the front oblique surface of the oblique diamond-shaped spacer matches the dovetail groove, and the rear oblique surface matches the oblique surface of the dovetail of the cloth support platform.

[0010] The oblique diamond-shaped spacer is installed between the locking block of the frustum-shaped structure and the mating surface of the cloth support table (the first working position), and the front oblique surface of the oblique diamond-shaped spacer matches the oblique surface processed at the corresponding position of the cloth support table, and the rear oblique surface matches the oblique surface of the locking block.

[0011] The oblique rhombus-shaped spacers in the present invention are oblique rhombus-shaped bars or oblique rhombus-shaped blocks with a long strip structure.

[0012] The beneficial effects of the present invention are as follows:

[0013] The key component of the device is the oblique diamond-shaped spacer used to adjust the position of the loom's cloth support, ensuring that the front edge of the cloth support and the reed have the required spacing. At the same time, a rotatable expansion roller changes the direction of the cloth being taken up and drawn away from the weaving fell, reducing the angle between the cloth surface and the horizontal line. This reduces the force exerted by the front edge of the cloth support on the weft yarn to a level that does not affect the size of the meshes on the cloth surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the anti-defect device of the rapier loom.

[0015] Figure 1 Serial number: 1 is the oblique diamond spacer, 2 is the cloth support table, 3 is the cloth support table support, 4 is the dovetail groove, 5 is the fastening screw, 6 is the bar through hole, 7 is the locking block, 8 is the take-up roller, 9 is the expansion roller, 10 is the reed, 11 is the cloth fell, 12 is the upper warp yarn, 13 is the lower warp yarn, 14 is the front cloth support edge of the rapier loom cloth support table.

[0016] Figure 2 The oblique diamond-shaped spacer is placed in the first working position of the dovetail groove.

[0017] Figure 3 The oblique diamond-shaped spacer is placed in the second working position of the dovetail groove. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the following embodiments (with accompanying drawings):

[0019] like Figure 1As shown, the device for preventing the start-up fault of a rapier loom of the present invention includes a cloth supporting assembly and a cloth guiding assembly arranged in sequence from front to back, and is characterized in that: the cloth supporting assembly includes a cloth supporting base 3 with a transversely arranged dovetail groove processed on the top surface, a cloth supporting platform 2 installed in the dovetail groove processed on the cloth supporting base through a dovetail arranged on the bottom surface that cooperates with the dovetail groove, and an oblique diamond-shaped spacer 1 installed in the dovetail groove for adjusting the front and rear distance between the front cloth supporting edge and the reed; a longitudinally arranged strip through-hole 6 is processed on the rear part of the cloth supporting base 2, and the cloth supporting base 2 is fixedly connected to the cloth supporting base 3 by a fastening screw 5 installed in the strip through-hole 6 and a locking block 7 of a frustum-shaped structure with an internal threaded connecting hole that cooperates with the dovetail groove; the cloth guiding assembly includes an expanding roller 9 that rotates under the drive of a power mechanism and is arranged close to the top of the winding roller 8; the expanding roller is passed around by the cloth bag, and the angle between the line of the woven cloth being led away from the loom and the horizontal line is maintained at 1 degree.

[0020] More specifically, the oblique diamond-shaped spacers can be placed at two different locations within the dovetail groove connecting the fabric support and the fabric support base of the rapier loom. When weaving standard fabrics on a rapier loom, the oblique diamond-shaped spacers are placed in the first working position of the dovetail groove (behind the fabric support), with a minimum spacing of 2 mm between the front fabric support edge and the reed. This allows the fabric support to effectively ensure the stability of the cloth fell without affecting the fabric structure. When weaving open fabrics that are sensitive to uniform mesh, the oblique diamond-shaped spacers are placed in the second working position of the dovetail groove (in front of the fabric support), with a minimum spacing of 6 mm between the front fabric support edge and the reed. This allows the front fabric support edge to stay away from unstable weft yarns at the cloth fell and support the woven, stable fabric surface without affecting unstable weft yarns at the cloth fell. At the same time, a rotatable expansion roller changes the direction of the take-up route, ensuring the angle between the take-up route and the horizontal is maintained at approximately 1 degree. This reduces the force exerted by the front edge of the weft support on the weft yarn. Ultimately, the influence of the front edge of the weft support on the weft yarn is kept within acceptable limits, ensuring uniform mesh structure in the woven fabric. The front edge of the weft support maintains a clearance of two desired dimensions from the reed. The rapier loom's weft support has two adjustable positions to accommodate specialized fabrics and prevent weaving faults.

[0021] like Figure 2 As shown, the oblique diamond-shaped spacer 1 is installed between the locking block 7 of the frustum-shaped structure and the mating surface of the cloth support table (in the first working position, the minimum spacing between the front cloth support edge and the reed is 2 mm), and the front oblique surface of the oblique diamond-shaped spacer matches the oblique surface processed at the corresponding position of the cloth support table, and the rear oblique surface matches the oblique surface of the locking block 7.

[0022] like Figure 3As shown, the oblique diamond spacer 1 is installed at the front of the cloth support table (the second working position, the minimum distance between the front cloth support edge and the reed is 6 mm), and the front oblique surface of the oblique diamond spacer cooperates with the dovetail groove, and the rear oblique surface cooperates with the oblique surface of the dovetail of the cloth support table.

[0023] The oblique rhombus-shaped spacer 1 in the present invention is an oblique rhombus-shaped strip or an oblique rhombus-shaped block with a long strip structure.

[0024] The working principle of the present invention is as follows:

[0025] The reed 10 is fixed on the sley of the rapier loom. Warp yarns are passed between the teeth of the reed. The warp yarns move up and down to form a shed. The front angle of the shed is the weaving fell 11. The front edge 14 of the rapier loom's cloth support plays a key role in stabilizing the position of the weaving fell. It has two key dimensions: one is the height position, and the other is the minimum spacing between it and the reed. The sley swings back and forth. When the sley is away from the weaving fell, the weft yarn is introduced into the shed formed by the upper warp yarn 12 and the lower warp yarn 13. When the sley moves toward the weaving fell, the reed pushes the weft yarn in the weaving fell toward the weaving fell. At the same time, the upper warp yarn moves down and the lower warp yarn moves up, interlacing to complete one interweaving. In this way, the warp and weft yarns are interwoven into cloth at the weaving fell. The loom take-up roller guides the woven cloth away from the weaving fell through the loom cloth support and the expansion roller.

Claims

1. A device for preventing start-up faults in a rapier loom, comprising a cloth support assembly and a cloth guide assembly arranged in sequence from front to back, characterized in that: The cloth support assembly comprises a cloth support base (3) with a transversely arranged dovetail groove processed on the top surface, a cloth support base (2) installed in the dovetail groove processed on the cloth support base through a dovetail provided on the bottom surface and matched with the dovetail groove, and an oblique rhombus-shaped spacer (1) installed in the dovetail groove for adjusting the front and rear distance between the front cloth support edge and the reed; a longitudinally arranged strip through hole (6) is processed on the rear part of the cloth support base (2), and the cloth support base (2) is fixedly connected to the cloth support base (3) through a fastening screw (5) installed in the strip through hole (6) and a locking block (7) of a frustum-shaped structure with an internal threaded connection hole processed and matched with the dovetail groove; the cloth guiding assembly comprises an expansion roller (9) which rotates under the drive of a power mechanism and is arranged close to the top of the winding roller (8); the expansion roller is passed by the cloth, and the angle between the line of the woven cloth being guided away from the cloth opening and the horizontal line is maintained at 1 degree.

2. The device for preventing start-up faults in a rapier loom according to claim 1, characterized in that: The oblique diamond-shaped spacer (1) is installed at the front of the cloth support platform, and the front oblique surface of the oblique diamond-shaped spacer matches the dovetail groove, and the rear oblique surface matches the oblique surface of the dovetail of the cloth support platform.

3. The device for preventing start-up faults of a rapier loom according to claim 1, characterized in that: The oblique rhombus-shaped spacer (1) is installed between the locking block (7) of the frustum-shaped structure and the matching surface of the cloth support table, and the front oblique surface of the oblique rhombus-shaped spacer matches the oblique surface processed at the corresponding position of the cloth support table, and the rear oblique surface matches the oblique surface of the locking block (7).

4. The device for preventing start-up faults in a rapier loom according to claim 1, characterized in that: The oblique rhombus-shaped spacer (1) is an oblique rhombus-shaped strip or an oblique rhombus-shaped block with a long strip structure.

Images