A rapier loom let-off mechanism and a let-off method thereof

Abstract

The application belongs to the technical field of looms, and particularly relates to a rapier loom let-off mechanism and a let-off method thereof, which comprises a mounting frame and a let-off wheel; two mounting plates are symmetrically welded on the right side of any mounting frame, a mounting groove is formed in the middle and lower part of the mounting plate, and a let-off wheel is arranged in the middle of the two mounting plates; the let-off wheel comprises an outer wheel, a buffer wheel and a driving wheel, a transmission shaft is transversely inserted into the middle part of the let-off wheel, and the outer wheel, the buffer wheel and the driving wheel are sleeved on the transmission shaft; the let-off compensation mechanism is provided, which compensates the force received when the loom linearly feeds the thread, prevents the thread from being pulled off and excessively rubbed, and buffers the force suddenly received by the thread when the thread is subjected to the pulling force, so that the thread is prevented from being broken at the let-off wheel.

Description

Technical Field

[0001] This invention relates to the field of loom technology, specifically to a warp feeding mechanism and method for a rapier loom. Background Technology

[0002] Rapier looms are the most widely used shuttleless looms. Besides possessing the high speed, high automation, and high efficiency of traditional shuttleless looms, their active weft insertion method offers strong adaptability to various yarn types. Furthermore, rapier looms have a significant advantage in multi-color weft weaving, capable of producing yarn-dyed products with up to 16 weft colors. With shuttleless looms replacing shuttle looms, rapier looms will become the main type of machine for woven fabric production. However, traditional warp feeding mechanisms still have shortcomings. For example, during linear yarn feeding, the yarn can be pulled due to machine speed variations. Traditional yarn guide wheels are rigidly connected, leading to excessive friction between the yarn and the guide wheels when pulled, increasing yarn wear. Worn fabrics become dull and lack luster, significantly impacting product quality. Additionally, the disassembly and installation of guide wheels in traditional warp feeding mechanisms are cumbersome, affecting maintenance and upkeep. Therefore, we propose a new warp feeding mechanism and method for rapier looms. Summary of the Invention

[0003] The purpose of this invention is to provide a warp feeding mechanism and method for a rapier loom, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a warp feeding mechanism and method for a rapier loom, comprising a mounting frame and a warp feeding wheel; two mounting plates are symmetrically welded to the right side of each mounting frame, and mounting grooves are provided in the lower middle part of each mounting plate, with a warp feeding wheel disposed between the two mounting plates;

[0005] The warp feed wheel includes an outer wheel, a buffer wheel, and a drive wheel. A drive shaft is laterally inserted into the middle of the warp feed wheel, and the outer wheel, the buffer wheel, and the drive wheel are all sleeved on the drive shaft.

[0006] There are two outer wheels, which are located on the outermost side of the warp feed wheel; the two outer wheels are sandwiched around the outermost end of the drive wheel, and the buffer wheel is sleeved on the drive wheel and abuts against the inner side of the outer wheels;

[0007] The outer wheel has an adjustment cavity in its inner cavity, and the buffer wheel is movably inserted into the adjustment cavity. A limiting ring is provided on the outer edge of the buffer wheel near the outer wheel to restrict the buffer wheel within the adjustment cavity.

[0008] Both ends of the drive shaft are equipped with limit heads, and the outer side wall of the limit head is screwed with a fixing bolt, which fixes the limit head and the drive shaft together inward; after installation, the limit head abuts against the outer side surface of the outer wheel.

[0009] The limiting head is fitted with a limiting bushing on its outer side. The limiting bushing is rotatably mounted on the mounting plate and inserted into the mounting groove. The mounting bracket does not contact the limiting bushing.

[0010] The outer end of the limiting bushing is provided with a rectangular head, which is rotatably disposed inside the limiting bushing. A valve is provided at the end of the rectangular head, and pistons are provided at both the top and bottom of the rectangular head. A shock-absorbing spring is provided at the bottom of the mounting groove.

[0011] Preferably, buffer springs are equidistantly arranged along the buffer wheel inside the adjustment cavity, and the two ends of the buffer springs abut against the buffer wheel and the outer wheel, respectively.

[0012] Preferably, a ball bearing is fitted at the connection between the buffer wheel and the drive wheel.

[0013] Preferably, locking bolts are screwed at equal intervals on the outer side of the outer wheel, and the locking bolts fix the outer wheel and the drive wheel together inward.

[0014] Preferably, the locking bolt includes a nut, a screw, and a knob handle. The screw is fixedly welded to the knob handle, and the screw is threaded through and screwed into the nut. A rubber washer is provided on the side of the nut near the outer wheel.

[0015] Preferably, the end of the limiting head is provided with a circular head, the middle of the limiting bushing is provided with a circular receiving cavity, and the circular head of the limiting head is rotatably disposed in the circular receiving cavity.

[0016] Preferably, the mounting groove is an oblong hole that is larger at the top and smaller at the bottom, and the top of the shock-absorbing spring is provided with a shock-absorbing head. The top of the shock-absorbing head and the top of the inner cavity of the mounting groove are symmetrically provided with mounting holes, and the piston abuts in the mounting hole.

[0017] Preferably, the feeding speed is determined according to the characteristics of the fabric, the yarn is kept in the center of the warp feed roller, the height of the yarn during feeding is kept on the same horizontal line, and the distance between adjacent warp feed rollers is kept between 20-30cm.

[0018] The distance between the two buffer wheels is 3-4 times the diameter of the yarn, and the hub of the buffer wheel on the side closer to the yarn is an inwardly inclined curved surface.

[0019] After the yarn is installed, the two ends of the warp feed wheel are compressed downwards by the pressure of the rectangular head to the shock absorption spring, with a compression depth of 2-3cm. The weight of the warp feed wheel is between 150g and 200g.

[0020] The tension value of the yarn is compared with the preset tension value. After being subjected to force, the rectangular head and the shock-absorbing spring sink to a depth of 2-5cm. If the sinking depth is exceeded, the transmission ratio of the feeding is reduced.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This solution provides a warp feed compensation mechanism to compensate for the force received during linear warp feed on the loom, preventing the yarn from being pulled apart and excessively rubbed. When the yarn is under tension, the force will act on the warp feed wheel. The warp feed wheel under the force applies a downward force, which is then applied to the damping spring. The damping spring reduces the force and vibration through its elasticity, buffering the sudden force on the yarn and preventing the yarn from breaking at the warp feed wheel.

[0023] 2. At the same time, a buffer structure is also set on the surface of the warp feed wheel. When the buffer wheel is subjected to force, it contracts inward and squeezes the internal buffer spring. The buffer spring cancels out the force through its elasticity and pushes the buffer wheel outward. It can also restrict the weaving thread and keep the weaving thread in the middle of the drive wheel for conveying. The structure is reasonably designed and can greatly reduce the wear rate of the weaving thread. The surface of the fabric after the wear rate is reduced is more delicate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the arrangement and installation of the feeding mechanism of the present invention;

[0025] Figure 2 This is a front view of the feeding mechanism of the present invention;

[0026] Figure 3 This is a schematic diagram of the warp wheel of the present invention;

[0027] Figure 4 This is a schematic diagram of the limiting bushing of the present invention;

[0028] Figure 5 This is a planar sectional view of the warp wheel of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged view of a specific area.

[0030] In the diagram: 10 mounting frames; 20 prayer wheels;

[0031] 101 Mounting plate; 102 Mounting slot; 103 Shock-absorbing spring; 104 Shock-absorbing head;

[0032] 201 Outer wheel; 202 Buffer wheel; 203 Drive wheel; 204 Locking bolt; 205 Drive shaft; 206 Limit head; 207 Limit bushing; 208 Rectangular head; 209 Adjustment chamber; 210 Buffer spring; 211 Valve; 212 Piston. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Example:

[0036] Please see Figure 1-6 The present invention provides a technical solution for a warp feeding mechanism and warp feeding method for a rapier loom: including a mounting frame 10 and a warp feeding wheel 20;

[0037] Two mounting plates 101 are symmetrically welded to the right side of any mounting frame 10. Mounting grooves 102 are provided in the lower middle part of each mounting plate 101, and a warp feed wheel 20 is provided in the middle of the two mounting plates 101.

[0038] The warp feeder 20 includes an outer wheel 201, a buffer wheel 202, and a drive wheel 203. A drive shaft 205 is laterally inserted into the middle of the warp feeder 20, and the outer wheel 201, the buffer wheel 202, and the drive wheel 203 are all sleeved on the drive shaft 205.

[0039] There are two outer wheels 201, which are located on the outermost side of the warp feed wheel 20; the two outer wheels 201 are sandwiched around the outermost end of the drive wheel 203, and the buffer wheel 202 is sleeved on the drive wheel 203, with the buffer wheel 202 abutting against the inner side of the outer wheels 201.

[0040] The inner cavity of the outer wheel 201 is provided with an adjustment cavity 209, and the buffer wheel 202 is movably inserted into the adjustment cavity 209. A limiting ring is provided on the outer edge of the buffer wheel 202 near the end of the outer wheel 201, so that the buffer wheel 202 is restricted in the adjustment cavity 209.

[0041] Buffer springs 210 are equidistantly arranged along the buffer wheel 202 inside the adjustment cavity 209, and the two ends of the buffer springs 210 abut against the buffer wheel 202 and the outer wheel 201 respectively.

[0042] A ball bearing is fitted at the connection between the buffer wheel 202 and the drive wheel 203;

[0043] Locking bolts 204 are screwed at equal intervals on the outer side of the outer wheel 202, and the locking bolts 204 fix the outer wheel 201 and the drive wheel 203 together inward;

[0044] The locking bolt 204 includes a nut, a screw, and a knob handle. The screw is fixedly welded to the knob handle. The screw is threaded through and screwed into the nut. A rubber washer is provided on the side of the nut near the outer wheel 201.

[0045] Limit heads 206 are installed at both ends of the drive shaft 205. Fixing bolts are screwed onto the outer side wall of the limit head 206, and the fixing bolts fix the limit head 206 and the drive shaft 205 together with each other inward. After installation, the limit head 206 abuts against the outer side of the outer wheel 201.

[0046] A limiting head 206 is sleeved on the outside of a limiting bushing 207. The end of the limiting head 206 is provided with a circular head, and the middle of the limiting bushing 207 is provided with a circular receiving cavity. The circular head of the limiting head 206 is rotatably disposed in the circular receiving cavity.

[0047] The limiting bushing 207 is rotatably mounted on the mounting plate 101 and inserted into the mounting groove 102; the mounting bracket 10 does not contact the limiting bushing 207.

[0048] A rectangular head 208 is provided at the outer end of the limiting bushing 207. The rectangular head 208 is rotatably disposed inside the limiting bushing 207. A valve 209 is provided at the end of the rectangular head 208. A piston 212 is provided at both the top and bottom of the rectangular head 208.

[0049] A shock-absorbing spring 103 is provided at the bottom of the mounting groove 102. The mounting groove 102 is an oblong hole that is larger at the top and smaller at the bottom. A shock-absorbing head 104 is provided at the top of the shock-absorbing spring 103. The top of the shock-absorbing head 104 and the top of the inner cavity of the mounting groove 102 are symmetrically provided with mounting holes. The piston 212 abuts against the mounting hole.

[0050] This solution provides a warp feed compensation mechanism to compensate for the forces experienced during linear warp feed on the loom, preventing the yarn from breaking and causing excessive friction. The specific warp feed method of this solution is as follows:

[0051] The feeding speed is determined according to the characteristics of the fabric. The yarn is kept in the center of the warp feed roller 20, and the height of the yarn feeding is kept at the same level. The distance between adjacent warp feed rollers 20 is kept between 20-30cm.

[0052] The distance between the two buffer wheels 202 is 3-4 times the diameter of the yarn, and the hub of the buffer wheel 202 on the side closer to the yarn is an inwardly inclined curved surface.

[0053] After the yarn is installed, the two ends of the warp feed roller 20 are compressed downward by the pressure of the rectangular head 208 to the shock absorber spring 103, with a compression depth of 2-3cm. The weight of the warp feed roller 20 is between 150g and 200g.

[0054] The tension value of the yarn is compared with the preset tension value. After being subjected to force, the rectangular head 208 and the shock-absorbing spring 103 sink to a depth of 2-5cm. If the sinking depth is exceeded, the transmission ratio of the feeding is reduced.

[0055] The mounting bracket 10 is fixed on the loom's discharge mechanism, and the weaving thread extends along the groove direction of the warp feed roller 20. The number of warp feed rollers 20 installed is determined by the actual width of the loom's discharge mechanism.

[0056] Then, when the yarn is fed on the warp feed roller 20, it will get stuck and pulled due to the speed of material output. When the yarn is under tension, the force will act on the warp feed roller 20. The two sides of the warp feed roller 20 are supported by the shock-absorbing springs 103. The drive shaft 205 keeps the warp feed roller 20 rotating normally, while the rectangular bushing 208 is stationary relative to the limiting bushing 207.

[0057] The force-bearing warp roller 20 applies a downward force, which is then applied to the damping spring 103. The damping spring 103 reduces the force and vibration through its elasticity, buffers the sudden force on the yarn, and prevents the yarn from breaking at the warp roller 20.

[0058] Meanwhile, the damper fitted inside the shock-absorbing spring 103 reduces the vibration amplitude through damping force, thereby achieving buffering and quickly restoring the warp feeder 20 to its initial state;

[0059] Pistons 212 are symmetrically arranged at the top and bottom of the rectangular head 208. The inner cavity of the rectangular head 208 is hollow and sealed. Air is injected into the rectangular head 208 through the valve 211, causing the piston 212 to protrude and be engaged in the mounting hole. The rectangular head 208 is fixed by the limiting of the mounting hole.

[0060] The warp feed roller 20 can be easily disassembled with the help of the pneumatic piston 212. Unlike the previous hard fixing method, this soft fixing can reduce the impact of the warp feed roller 20 on the yarn. When the yarn is under stress, it can immediately buffer the force, which is very convenient and efficient.

[0061] Meanwhile, a buffer structure is also provided on the surface of the warp feed wheel 20. When the yarn travels in the groove of the warp feed wheel 20, it will inevitably rub against the edge of the outer wheel 201. When hard contact occurs, it will cause certain damage to the yarn and affect the quality of the fabric. In this solution, a buffer wheel 202 is provided on the inner side of the outer wheel 201, and the outer edge of the buffer wheel 202 is provided with wear-resistant silicone that comes into contact with the yarn.

[0062] When the yarn is stressed and tilts towards the outer wheel 201, it first contacts the buffer wheel 202. The buffer wheel 202 is movably set in the inner cavity of the outer wheel 201. When the buffer wheel 202 is stressed, it contracts inward and squeezes the internal buffer spring 210. The buffer spring 210 cancels out the force through its elasticity and pushes the buffer wheel 202 outward through the buffer spring 201. It can also restrict the yarn and keep the yarn in the middle of the drive wheel 203 for conveying. The structure is reasonably designed and can greatly reduce the wear rate of the yarn. The surface of the fabric after the wear rate is reduced is more delicate.

[0063] Meanwhile, the outer wheel 201, buffer wheel 202 and buffer wheel 203 in this solution are all made of engineering plastics and the inner cavity of the wheel body is hollow, which effectively reduces the overall weight of the feed wheel 20; the outer wheel 202 and the drive wheel 203 are locked together by locking bolts 204, and the locking bolts 204 can be unscrewed in sequence when disassembling.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A warp feeding mechanism for a rapier loom, comprising a mounting frame (10) and a warp feeding wheel (20), characterized in that, Two mounting plates (101) are symmetrically welded to the right side of any of the mounting frames (10). The mounting plates (101) are provided with mounting grooves (102) in the lower middle part. A warp feed wheel (20) is provided between the two mounting plates (101). The mounting groove (102) is an oblong hole with a larger top and a smaller bottom. The top of the shock-absorbing spring (103) is provided with a shock-absorbing head (104). The top of the shock-absorbing head (104) and the top of the inner cavity of the mounting groove (102) are symmetrically provided with mounting holes. The piston (212) abuts against the mounting hole. The warp feed roller (20) includes an outer roller (201), a buffer roller (202), and a drive roller (203). A drive shaft (205) is laterally inserted into the middle of the warp feed roller (20), and the outer roller (201), the buffer roller (202), and the drive roller (203) are all sleeved on the drive shaft (205). The number of warp feed rollers (20) installed is determined by the actual width of the loom's feed mechanism. There are two outer wheels (201), which are set on the outermost side of the warp feed wheel (20); the two outer wheels (201) are sandwiched on the outermost end of the drive wheel (203), and the buffer wheel (202) is sleeved on the drive wheel (203) and the buffer wheel (202) is close to the inner side of the outer wheels (201); The outer wheel (201) has an adjustment cavity (209) in its inner cavity. The buffer wheel (202) is movably inserted into the adjustment cavity (209). A limiting ring is provided on the outer edge of the buffer wheel (202) near the outer wheel (201) so that the buffer wheel (202) is restricted in the adjustment cavity (209). Locking bolts (204) are screwed at equal intervals on the outer side of the outer wheel (201), and the locking bolts (204) fix the outer wheel (201) and the drive wheel (203) together inward; Both ends of the drive shaft (205) are equipped with limit heads (206). The outer side wall of the limit head (206) is screwed with a fixing bolt, and the fixing bolt fixes the limit head (206) and the drive shaft (205) together inward. After installation, the limit head (206) abuts against the outer side of the outer wheel (201). The limiting head (206) is sleeved with a limiting bushing (207) on its outer side. The limiting bushing (207) is rotatably mounted on the mounting plate (101) and inserted into the mounting groove (102). The mounting bracket (10) does not contact the limiting bushing (207). The outer end of the limiting bushing (207) is provided with a rectangular head (208), which is rotatably disposed within the limiting bushing (207). A valve (211) is provided at the end of the rectangular head (208), and pistons (212) are provided at both the top and bottom of the rectangular head (208). A shock-absorbing spring (103) is provided at the bottom of the mounting groove (102). Buffer springs (210) are equidistantly arranged along the buffer wheel (202) inside the adjustment cavity (209), and the two ends of the buffer springs (210) abut against the buffer wheel (202) and the outer wheel (201) respectively.

2. The warp feeding mechanism for a rapier loom according to claim 1, characterized in that: A ball bearing is fitted at the connection between the buffer wheel (202) and the drive wheel (203).

3. The warp feeding mechanism for a rapier loom according to claim 1, characterized in that: The locking bolt (204) includes a nut, a screw and a knob handle. The screw is fixedly welded to the knob handle. The screw is threaded through the nut. A rubber washer is provided on the side of the nut near the outer wheel (201).

4. The warp feeding mechanism for a rapier loom according to claim 1, characterized in that: The end of the limiting head (206) is provided with a circular head, and the middle of the limiting bushing (207) is provided with a circular receiving cavity, and the circular head of the limiting head (206) is rotatably disposed in the circular receiving cavity.

5. A warp feeding method for a warp feeding mechanism on a rapier loom according to any one of claims 1-4, characterized in that: The feeding speed is determined according to the characteristics of the fabric. The yarn is kept in the center of the warp feed roller (20), and the height of the yarn is kept at the same level. The distance between adjacent warp feed rollers (20) is kept between 20-30cm. The distance between the two buffer wheels (202) is 3-4 times the diameter of the yarn, and the hub of the buffer wheel (202) on the side closer to the yarn is an inwardly inclined curved surface; After the yarn is installed, the two ends of the warp feed roller (20) are compressed downward by the pressure of the rectangular head (208) to the shock absorber spring (103), the compression depth is 2-3cm, and the weight of the warp feed roller (20) is between 150g and 200g. The tension value of the yarn is compared with the preset tension value. After being subjected to force, the rectangular head (208) and the shock-absorbing spring (103) sink to a depth of 2-5cm. If the sinking depth is exceeded, the transmission ratio of the feeding is reduced.

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