Weft yarn cutting device

Abstract

The utility model discloses a weft yarn cutting device which comprises a cam, a transmission arm, a mounting seat, a fixed blade, a movable blade, a first screw rod, a first nut and a first spring, one end of the transmission arm is in contact with the cam, the other end of the transmission arm is connected with the movable blade, and the two ends of the transmission arm are hinged to the mounting seat. The first screw sequentially penetrates through the movable blade and the fixed blade to be in threaded connection with the first nut, the first spring is arranged on the peripheral wall of the first screw in a sleeving mode, one end of the first spring abuts against the movable blade, and the other end of the first spring abuts against the first nut. The cam drives the transmission arm to move up and down, the transmission arm drives the movable blade to move up and down, so that the movable blade moves relative to the fixed blade, and when weft yarn is cut and yarn varieties are changed, the first nut is rotated to move in the axial direction of the first screw rod; the gap between the movable blade and the fixed blade is adjusted through the change of the pre-tightening force of the first spring, so that the purpose of flexibly adjusting the gap between the movable blade and the fixed blade is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to textile machine technical field, concretely relates to weft cutting device. BACKGROUND

[0002] The weft cutting device is the key component of the textile equipment such as the rapier loom and the air jet loom, and its core function is to cut the weft accurately after guiding the weft to ensure the smoothness of cloth surface and the continuity of weaving process.The core mechanism of the device is a mechanical cam-linkage driving structure, which converts the rotary motion of the power shaft into the reciprocating shearing action of the movable blade through the cam profile to push the multi-stage linkage mechanism, and cooperates with the fixed blade to complete the weft shearing.However, the initial gap adjustment between the movable blade and the fixed blade in the prior art relies on the manual coarse adjustment mode of increasing or decreasing metal shims, which cannot realize dynamic adjustment in the production process, resulting in the need to stop the machine and disassemble the parts when changing the yarn variety (such as switching from high-elasticity yarn to thick yarn), which seriously restricts the production efficiency. SUMMARY

[0003] In view of the above technical problems, the utility model provides a weft cutting device, rotating the first nut to move the first nut along the first screw rod in the axial direction, and adjusting the gap between the movable blade and the fixed blade through the change of the pre-tightening force of the first spring.

[0004] The technical scheme adopted by the utility model is as follows: a weft cutting device, comprising a cam, a transmission arm, a mounting seat, a fixed blade, a movable blade, a first screw rod, a first nut and a first spring, one end of the transmission arm is in contact with the cam, the other end of the transmission arm is connected with the movable blade, the transmission arm is hingedly connected with the mounting seat between the two ends, the first screw rod is threadedly connected with the first nut in sequence through the movable blade and the fixed blade, the first spring is sleeved on the outer peripheral wall of the first screw rod, one end of the first spring abuts against the movable blade, and the other end of the first spring abuts against the first nut.

[0005] Optionally, the mounting seat is fixedly provided with a support plate, the support plate is movably provided with a blade seat at the end portion, and the fixed blade is fixedly installed in the blade seat.

[0006] Optionally, the transmission arm comprises a first swing arm, a second swing arm and a transmission rod connected in sequence, the first swing arm is hingedly connected with the mounting seat, one end of the second swing arm is angularly connected with the first swing arm, and the other end of the second swing arm is angularly connected with the transmission rod, the fixed blade is provided with a groove for the transmission rod to pass through, and the movable blade is provided with a through hole in gap cooperation with the transmission rod.

[0007] Optionally, the support plate is provided with an arc-shaped hole, the blade seat is connected with the support plate through a second screw rod, and the second screw rod is threadedly matched with a second nut in sequence through the arc-shaped hole and the blade seat.

[0008] Optionally, the first swing arm is in contact with the cam, the first swing arm is installed on the mounting seat through a rotating shaft, the rotating shaft is fixedly connected with the mounting seat, and the first swing arm is provided with a through hole in rotation fit with the rotating shaft.

[0009] Optionally, the support plate is provided with the knife seat at one end, and the support plate is provided with a second spring at the other end, one end of the second spring is connected with the support plate, and the other end of the second spring is connected with one end of the first swing arm away from the second swing arm.

[0010] Optionally, the support plate is provided with a third screw rod, the third screw rod passes through the support plate and is in threaded fit with a third nut, the third screw rod is in threaded fit with a fourth nut, the third nut and the fourth nut clamp the support plate, and one end of the second spring away from the first swing arm is fixedly connected with the third screw rod.

[0011] Optionally, the first swing arm is provided with a roller in rotation, and the roller is in rolling contact with the cam.

[0012] The utility model discloses the beneficial effect is: cam drive transmission arm moves up and down, and transmission arm drives movable blade to move up and down, makes movable blade relative motion relative to fixed blade, and the weft is cut, when the yarn variety is changed, rotates first nut and makes first nut move along first screw rod axial direction, adjusts the clearance of movable blade and fixed blade through the pre-tightening force change of first spring, makes movable blade and fixed blade suitable for relatively thick or relatively thin yarn, thereby reaches the purpose that the clearance of movable blade and fixed blade is adjusted flexibly, need not to dismount parts, improves work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 The structure schematic view of the weft cutting device is provided for the utility model embodiment;

[0014] Fig. 2 The first screw rod and the first spring of the weft cutting device are provided for the utility model embodiment, and the schematic view is as follows:

[0015] Fig. 3 The second screw rod and the second spring of the weft cutting device are provided for the utility model embodiment, and the schematic view is as follows.

[0016] The marks in each drawing are as follows: 1, cam;2, first swing arm;3, mounting seat;4, fixed blade;5, movable blade;6, first screw rod;7, rotating shaft;8, first spring;9, second swing arm;10, transmission rod;11, arc-shaped hole;12, knife seat;13, second screw rod;14, second spring;15, third screw rod;16, third nut;17, fourth nut;18, roller;19, through hole;20, support plate;21, recess. DETAILED DESCRIPTION

[0017] The application will be further described in detail below with reference to the accompanying drawings and examples.

[0018] As Figs. 1 to 3 shown in the drawings, the embodiment discloses a weft cutting device, which comprises a cam 1, a transmission arm, a mounting seat 3, a fixed blade 4, a movable blade 5, a first screw rod 6, a first nut and a first spring 8, one end of the transmission arm is in contact with the cam 1, the other end of the transmission arm is connected with the movable blade 5, the mounting seat 3 is hingedly connected between the two ends of the transmission arm, the first screw rod 6 is in threaded connection with the first nut in sequence through the movable blade 5 and the fixed blade 4, the first spring 8 is sleeved on the outer peripheral wall of the first screw rod 6, one end of the first spring 8 abuts against the movable blade 5, and the other end of the first spring 8 abuts against the first nut. The cam 1 drives the transmission arm to move up and down, the transmission arm drives the movable blade 5 to move up and down, the movable blade 5 moves relatively to the fixed blade 4, the weft is cut, when the yarn variety is replaced, the first nut is rotated to move the first nut axially along the first screw rod 6, the gap between the movable blade 5 and the fixed blade 4 is adjusted through the change of the pre-tightening force of the first spring 8, the movable blade 5 and the fixed blade 4 are suitable for thinner or thicker yarns, so that the gap between the movable blade 5 and the fixed blade 4 is flexibly adjusted, components do not need to be disassembled and assembled, and the working efficiency is improved.

[0019] As Fig. 1 and 2 shown in the drawings, the mounting seat 3 is fixedly provided with a support plate 20, the support plate 20 is movably provided with a blade seat 12 at the end, and the fixed blade 4 is fixedly installed on the blade seat 12. The transmission arm comprises a first swing arm 2, a second swing arm 9 and a transmission rod 10 connected in sequence, the first swing arm 2 is hingedly connected with the mounting seat 3, one end of the second swing arm 9 is angularly connected with the first swing arm 2, and the other end of the second swing arm 9 is angularly connected with the transmission rod 10, the fixed blade 4 is provided with a groove 21 through which the transmission rod 10 passes, and the movable blade 5 is provided with a through hole 19 which is in gap cooperation with the transmission rod 10. The groove 21 is an arc-shaped groove, which is arranged at the bottom of the fixed blade 4, and the end of the groove 21 away from the fixed blade 4, and the end of the through hole 19 away from the movable blade 5, so as to avoid interference with the blade edge arranged at the end of the fixed blade 4 and the blade edge arranged at the end of the movable blade 5, and the first swing arm 2, the second swing arm 9 and the transmission rod 10 in the embodiment are vertically arranged in sequence.

[0020] As Fig. 1As shown, the support plate 20 is provided with an arc-shaped hole 11, the tool seat 12 is connected with the support plate 20 through a second screw rod 13, the second screw rod 13 passes through the arc-shaped hole 11, the tool seat 12 and a second nut in sequence and is in threaded cooperation with the second nut. By loosening the second nut, the second screw rod 13 drives the tool seat 12 to move along the arc-shaped hole 11, the fixed tool seat 12 and the movable tool seat 12 are adjusted at multiple angles, after adjustment, the second nut is tightened again, the second nut and the screw cap of the second screw rod 13 clamp the tool seat 12 and the support plate 20, the tool seat 12 is fixed to the bottom surface of the support plate 20, since the movable blade 5 is in clearance fit with the through hole 19, the movement of the movable blade 5 changes the relative angle between the through hole 19 and the transmission rod 10, but does not affect the up-down driving of the transmission rod 10 on the movable blade 5.

[0021] In this embodiment, as shown in the figure, Fig. 2 The first swing arm 2 is in contact with the cam 1, the first swing arm 2 is installed on the mounting seat 3 through a rotating shaft 7, the rotating shaft 7 is fixedly connected with the mounting seat 3, and the first swing arm 2 is provided with a through hole 19 in rotational cooperation with the rotating shaft 7.

[0022] In this embodiment, as shown in the figure, Fig. 3 The support plate 20 is provided with the tool seat 12 at one end, the support plate 20 is provided with a second spring 14 at the other end, one end of the second spring 14 is connected with the support plate 20, and the other end of the second spring 14 is connected with one end of the first swing arm 2 away from the second swing arm 9. The second spring 14 can provide a reverse pre-tightening force to offset the inertial impact when the cam 1 rotates at high speed.

[0023] In this embodiment, as shown in the figure, Fig. 3 The support plate 20 is provided with a third screw rod 15, the third screw rod 15 passes through the support plate 20 and is in threaded cooperation with a third nut 16, the third screw rod 15 is in threaded cooperation with a fourth nut 17, the third nut 16 and the fourth nut 17 clamp the support plate 20, and one end of the second spring 14 away from the first swing arm 2 is fixedly connected with the third screw rod 15. The second spring 14 is fixedly connected with the screw cap of the third screw rod 15, the second spring 14 is fixedly connected with the first swing arm 2, and the fixing mode can be adhesive fixing or pouring fixing. By adjusting the length of the third screw rod 15 extending out of the support plate 20, the pressure of the second spring 14 acting on the first swing arm 2 is adjusted, and then the contact force between the first swing arm 2 and the cam 1 is adjusted. The first swing arm 2 is rotatably provided with a roller 18, and the roller 18 is in rolling contact with the cam 1. This is helpful to reduce the friction coefficient.

[0024] It can be understood that the specific embodiments described above are only used to explain the utility model, and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description. Multiple technical solutions in the same embodiment and multiple technical solutions of different embodiments can be arranged and combined to form new technical solutions without contradiction or conflict. Any equivalent structural transformation using the contents of the utility model specification and drawings, direct or indirect application in other related technical fields, are also included in the protection scope of the utility model.

Claims

1. A weft yarn cutting device, characterized in that, It includes a cam, a transmission arm, a mounting base, a fixed blade, a movable blade, a first screw, a first nut, and a first spring. One end of the transmission arm contacts the cam, and the other end of the transmission arm is connected to the movable blade. The two ends of the transmission arm are hinged to the mounting base. The first screw passes through the movable blade and the fixed blade in sequence and is threadedly connected to the first nut. The first spring is sleeved on the outer peripheral wall of the first screw, with one end of the first spring abutting against the movable blade and the other end of the first spring abutting against the first nut.

2. The weft yarn cutting device according to claim 1, characterized in that, The mounting base is fixedly mounted with a support plate, and a tool holder is movably provided at the end of the support plate. The fixed blade is fixedly mounted on the tool holder.

3. The weft yarn cutting device according to claim 2, characterized in that, The transmission arm includes a first swing arm, a second swing arm, and a transmission rod connected in sequence. The first swing arm is hinged to the mounting base. One end of the second swing arm is connected to the first swing arm at an angle, and the other end of the second swing arm is connected to the transmission rod at an angle. The fixed blade is provided with a groove for the transmission rod to pass through, and the movable blade is provided with a through hole that is clearance-fitted with the transmission rod.

4. The weft yarn cutting device according to claim 2, characterized in that, The support plate has an arc-shaped hole, and the tool holder is connected to the support plate through a second screw. The second screw passes through the arc-shaped hole, the tool holder, and the second nut in sequence.

5. The weft yarn cutting device according to claim 3, characterized in that, The first swing arm contacts the cam, and the first swing arm is mounted on the mounting base via a rotating shaft. The rotating shaft is fixedly connected to the mounting base, and the first swing arm is provided with a through hole that rotatably engages with the rotating shaft.

6. The weft yarn cutting device according to claim 3, characterized in that, The support plate has the knife holder at one end and a second spring at the other end. One end of the second spring is connected to the support plate, and the other end of the second spring is connected to the end of the first swing arm away from the second swing arm.

7. The weft yarn cutting device according to claim 6, characterized in that, The support plate is provided with a third screw, which passes through the support plate and is threadedly engaged with a third nut. The third screw is threadedly engaged with a fourth nut, which clamps the support plate. The end of the second spring away from the first swing arm is fixedly connected to the third screw.

8. The weft yarn cutting device according to claim 3, characterized in that, The first swing arm is equipped with a roller that makes rolling contact with the cam.

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