An automatic weft-feeding device for sisal yarn loom

Abstract

The invention discloses an automatic weft-detecting and weaving device for a sisal yarn loom. The automatic weft-detecting and weaving device is connected to an electrical control circuit, and detects and weaves the weft through shuttle boxes at the left and right ends of a shuttle bed of the loom. The automatic weft-detecting and weaving device comprises a weft shuttle and a winding-changing conduction rod built in the weft shuttle. A weft-detecting induction block is arranged at the left end of the winding-changing conduction rod, and a spring is arranged on the inner side of the weft-detecting induction block. The spring is fixed in the weft shuttle by a first bolt. The right end of the winding-changing conduction rod is mounted on the axial hole of a support by a small shaft. The support is fixed to one side of a yarn guide groove of the weft shuttle by a second bolt. A limit screw is arranged on the outer side of the winding-changing conduction rod, and a stop pin is arranged at the shuttle cavity mouth just above the limit screw. The invention can detect the weft and weave in a timely, accurate and automatic manner, can realize the fully automatic weaving process of the loom, and has the advantages of simple structure, few faults, convenient installation and disassembly, reduced labor intensity, and improved production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary equipment for looms, and particularly to an automatic weft detecting and filling inserting device for a sisal yarn loom. Background Art

[0002] The currently common sisal yarn looms in China mainly include two models, namely JB170 type and JB130 type, both of which are shuttle looms. Previously, when filling inserting on such looms, it was necessary to stop the machine first and manually insert the filling. Repeatedly stopping and inserting the filling made the labor intensity of weavers high and the efficiency extremely low. After the appearance of the patent No. ZL01221284.9 (an automatic yarn feeding device for a sisal yarn loom), the problem of filling inserting without stopping the machine and electric filling inserting was successfully solved, and the production efficiency increased several times. However, this device relies on manual observation to judge whether the filling yarn in the weft shuttle is used up, and then the filling inserting action is started manually. Due to the subjective randomness and inaccuracy of manual judgment, premature or late filling inserting will cause missing or overlapping of weft yarns in the linen, affecting the appearance and quality of the linen. Because the problems of automatic weft detection and automatic filling inserting have not been well solved, there are serious problems such as missing weft and sometimes the filling cannot be pushed into the weft shuttle cavity on this loom. At the same time, because the weft yarn in the weft shuttle has to be stared at all the time, a weaver can only operate and manage one loom of this type. Due to long-term mental concentration, the weaver's operation is very tense and fatigued, and the production efficiency is not high either.

[0003] Term Explanation: "Filling" refers to the pirn, which is wound into a rod shape by yarn. The pirn is put into the weft shuttle cavity groove and the weft shuttle drives it to reciprocate and unwind the weft. "Filling inserting" means pushing the pirn into the weft shuttle cavity. According to the提法 of "filling change" in books such as "Weaving Principles", the "filling inserting" mentioned here is actually a different form of "filling change". Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic weft detecting and filling inserting device for a sisal yarn loom. Practice has proved that this device can detect the weft and insert the filling timely, accurately and automatically, can realize the full-automatic weaving process of the sisal yarn loom, and has the advantages of simple structure, few faults, convenient installation and disassembly, reducing labor intensity and improving production efficiency.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An automatic weft detecting and filling inserting device for a sisal yarn loom, the automatic weft detecting and filling inserting device detects the weft and inserts the filling respectively through the left and right shuttle boxes at both ends of the shuttle bed of the loom, and the automatic weft detecting and filling inserting device is connected with an electric control circuit, and is characterized in that:

[0007] The automatic weft detection and feeding device comprises a weft shuttle and a variable conduction rod built in the weft shuttle, a weft detection sensing block is arranged at the left end of the variable conduction rod, a spring is arranged on the inner side of the weft detection sensing block, the spring is fixed in the weft shuttle by a first bolt, the right end of the variable conduction rod is movably mounted on the axial hole of the support through a small shaft, the support is fixed to one side of the yarn guide groove of the weft shuttle by a second bolt, a limit screw is arranged on the outer side of the left end of the variable conduction rod, and the stop pin is arranged at the weft shuttle cavity slot just above the limit screw and connects the two walls of the cavity slot.

[0008] The left and right shuttle boxes are respectively arranged at the left and right ends of the shuttle bed of the sisal yarn loom. The left and right shuttle boxes respectively include the shuttle bed, and the front shuttle blocking plate, the upper shuttle blocking plate and the rear shuttle blocking plate installed on the shuttle bed. The leather knot is arranged on the axial outside of the shuttle box, and the front shuttle blocking plate is fixed to the shuttle bed by the fourth bolt and the fifth bolt.

[0009] The weft shuttle is modified by drilling holes, grooving, etc. appropriately, and a groove is provided along the middle line of the cavity bottom plate of the weft shuttle, and the groove can be an extension space for the variable conduction rod to swing up and down.

[0010] The variable transmission rod is a concave structure. A limit screw is arranged on the outer side of the left end of the variable transmission rod near the weft detection sensing block. The height of the limit screw can be adjusted according to actual needs. The limit screw cooperates with the stop pin to transmit the weft detection end signal. The variable transmission rod can swing up and down through the interaction of the spring and the small shaft.

[0011] The front shuttle blocking plate of the left shuttle box is provided with an elongated detection hole, and a bracket is fixed to the left front of the front shuttle blocking plate by a third bolt. The bracket is provided with an elongated hole corresponding to the detection hole, and a weft detection proximity switch is provided in the elongated hole. The weft detection proximity switch detects the weft yarn through the detection hole.

[0012] The electrical control circuit includes a transformer 380V / TC, a weft feeding AC contactor coil KM1, an auxiliary AC contactor coil KM2, a cloth collecting control AC contactor coil KM3, a time relay coil KT, a weft feeding electromagnet YT1, a cloth collecting control electromagnet YT2, a weft feeding end travel switch SQ, a weft feeding start travel switch SQ1, a weft detection proximity switch SQ2, a weft feeding button SB1, a cloth collecting pause button SB2, a fuse FU and related contacts.

[0013] The input end of the transformer 380V / TC is connected to the L1 and L2 phase lines, and the output end is respectively connected between the intersections a and i at both ends of the control circuit. The weft detection proximity switch SQ2 and the weft feeding button SB1 are connected in parallel between the intersections b and d. The weft feeding start travel switch SQ1 is connected between the intersections c and d. The weft feeding end travel switch SQ is connected between the intersections c and e. The cloth collection pause button SB2 is connected between the intersections b and g. The time relay KT coil is connected between the intersections g and i. The time relay KT contact is connected between Between the intersections g and h, the fuse FU is connected between the intersections a and b, the incoming AC contactor coil KM1, the auxiliary AC contactor coil KM2, and the collection control AC contactor coil KM3 are respectively connected between the intersections e and i, f and i, and h and i, and the contacts KM1-1, KM1-2, KM1-3, KM2-1, KM2-2, KM3-1, and KM3-2 are respectively connected between the intersections j and k, b and c, d and f, b and d, d and g, l and m, and b and g.

[0014] Beneficial effects of the present invention: Practice has proved that, compared with the prior art, the present invention detects the weft and automatically advances the yarn through electrical detection, which is timely, accurate and automatic, and is much more accurate than the previous manual observation and judgment and electric advancement. In addition, the linen cloth has fewer heavy wefts, fewer weft yarn heads at the edge of the cloth, and the cloth surface is much more beautiful. The sisal yarn loom basically realizes fully automated weaving, improving the production efficiency and economic benefits of the loom. At the same time, it also solves the inaccuracy of the previous manual observation and electric advancement, relieves the mental tension and physical and mental fatigue of the weavers, and greatly reduces the labor intensity. In addition, the weft detection and advancement mechanism has a simple structure, is easy to install and disassemble, has few faults, and is easy to maintain. Today, a weaver can manage and operate 2-4 looms of this type. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic diagram of the overall structure of an automatic weft detection and weaving device for a sisal yarn loom.

[0016] Figure 2 The present invention is a front view of a weft shuttle built-in weft detection mechanism for an automatic weft detection and feeding device of a sisal yarn loom.

[0017] Figure 3 The present invention is a cross-sectional view of a weft shuttle built-in weft detection mechanism of an automatic weft detection and feeding device for a sisal yarn loom.

[0018] Figure 4 The present invention discloses an electrical control circuit diagram of an automatic weft-feeding device for a sisal yarn loom.

[0019] In the figure: 1 weft shuttle, 2 weft sensing block, 3 spring, 4 first bolt, 5 limit screw, 6 stop pin, 7 groove, 8 variable transmission rod, 9 small shaft, 10 support, 11 second bolt, 12 yarn guide groove, 13 shuttle bed, 14 leather knot, 15 front shuttle plate, 16 third bolt, 17 bracket, 18 weft sensing proximity switch, 19 long hole, 20 detection hole, 21 fourth bolt, 22 fifth bolt, 23 upper shuttle plate, 24 rear shuttle plate, 25 shuttle box, 26 transformer 38 0V / TC, 27 feeding AC contactor coil KM1, 28 auxiliary AC contactor coil KM2, 29 cloth collecting control AC contactor coil KM3, 30 time relay KT contact, 31 time relay KT coil, 32 cloth collecting pause button SB2, 33 cloth collecting control electromagnet YT2, 34 feeding electromagnet YT1, 35 feeding button SB1, 36 feeding start travel switch SQ1, 37 feeding end travel switch SQ, 38 fuse FU. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] Several points in the present invention are explained:

[0022] 1. "Shuttle bed" is an idiomatic term, and the professional term in loom books is "sley".

[0023] 2. The "inside" and "outside" mentioned here are relative. The "inside" side refers to the inside of the component, which may be the bottom plate or the inside of the machine, and the "outside" side refers to the outside or the outside of the machine or component. Taking the weft shuttle as an example, the bottom plate facing the cavity groove of the weft shuttle is the "inside" side, and the side facing the outside of the cavity of the weft shuttle is the "outside" side. For example, the outer side of the variable transmission rod is equipped with a limit screw, and the "outside" here refers to the side pointing to the cavity groove of the weft shuttle.

[0024] 3. When the weft shuttle is in working state, its cavity notch faces outward, in the direction of the weaver, which is convenient for weaving.

[0025] like Figure 1 , 2 As shown in Figures 3 and 4, an automatic weft detecting and feeding device for a sisal yarn loom is used. The automatic weft detecting and feeding device detects and feeds the weft through the left and right shuttle boxes 25 at both ends of the shuttle bed of the loom respectively. The automatic weft detecting and feeding device is connected to an electrical control circuit, and the operation of the automatic weft detecting and feeding device is controlled by the electrical control circuit to improve the overall automation level of the sisal yarn loom operation and reduce the labor intensity of the workers.

[0026] The automatic weft detection and feeding device comprises a weft shuttle 1 and a variable conduction rod 8 built into the weft shuttle 1, a weft detection sensing block 2 is arranged at the left end of the variable conduction rod 8, a spring 3 is arranged on the inner side of the weft detection sensing block 2, the spring 3 is fixed in the weft shuttle 1 by a first bolt 4, the right end of the variable conduction rod 8 is movably mounted on the axial hole of the support 10 by a small shaft 9, the support 10 is fixed to one side of the yarn guide groove 12 of the weft shuttle 1 by a second bolt 11, a limit screw 5 is arranged on the outer side of the left end of the variable conduction rod 8, and a stop pin 6 is arranged at the slot of the weft shuttle 1 cavity just above the limit screw 5 and connects the two walls of the cavity slot.

[0027] The left and right shuttle boxes 25 are respectively arranged at the left and right ends of the shuttle bed 13 of the sisal yarn loom, and the left and right shuttle boxes 25 include the shuttle bed 13, and the front shuttle plate 15, the upper shuttle plate 23 and the rear shuttle plate 24 installed on the shuttle bed 13. The leather knot 14 is arranged on the axial outer side of the left and right shuttle boxes 25, and the front shuttle plate 15 is fixed to the shuttle bed 13 by the fourth bolt 21 and the fifth bolt 22.

[0028] A bracket 17 is fixed to the left front of the front shuttle plate 15 of the left shuttle box 25 by a third bolt 16. The bracket 17 is provided with an elongated hole 19, and a weft detection proximity switch 18 is provided in the elongated hole 19. The weft detection proximity switch 18 is in a normally open state. A detection hole 20 corresponding to the elongated hole 19 is provided on the front shuttle plate 15 of the left shuttle box 25. The weft detection proximity switch 18 detects the weft yarn through the detection hole 20, that is, the weft detection proximity switch 18 detects the weft detection sensor block 2 in the weft shuttle through the detection hole 20 of the front shuttle plate 15. When the weft detection proximity switch 18 is installed, it can be installed and adjusted according to the position of the weft detection sensor block 2 when the weft shuttle 1 stops in the left shuttle box 25.

[0029] The weft shuttle 1 needs to be modified by drilling holes, slotting, etc. on the normal weft shuttle. During the modification, the structural characteristics of the weft shuttle should be taken into consideration, and the damage to the weft shuttle 1 should be minimized as much as possible to maintain the structural rigidity and strength of the weft shuttle 1. For example, a groove 7 is provided along the middle line of the bottom plate of the cavity of the weft shuttle 1. The width and depth of the long groove 7 are moderate, and there is enough space for the variable conduction rod 8 to swing up and down.

[0030] The winding transmission rod 8 is a concave structure with good rigidity, light weight, and is not easily deformed by the weft compression. It is inclined at a certain angle in the cavity of the weft shuttle 1. It can be made of stainless steel Φ8 planed along the axis into a flat structure and welded.

[0031] A circular groove is provided at the contact point between the inner side of the weft sensing block 2 of the winding conductive rod 8 and the spring 3. The spring 3 is embedded in the circular groove and axially positions the winding conductive rod 8 to ensure that the winding conductive rod 8 can only swing up and down and cannot deviate left and right. The spring 3 has good elasticity, is sensitive to the change of the winding, and is not easy to fatigue and break.

[0032] The limit screw 5 is arranged on the outer side of the left end of the variable conduction rod 8 near the weft detection sensing block 2. The height of the limit screw 5 can be adjusted up and down according to actual needs. When the limit screw 5 moves to the upper limit position, it just contacts the stop pin 6 just above it, transmitting the weft detection end signal.

[0033] like Figure 4 As shown, the electrical control circuit includes transformer 380V / TC 26, weft feeding AC contactor coil KM127, auxiliary AC contactor coil KM2 28, cloth receiving control AC contactor coil KM3 29, time relay KT coil 31, cloth receiving pause button SB2 32, weft detection proximity switch SQ2 18, cloth receiving control electromagnet YT2 33, weft feeding electromagnet YT1 34, weft feeding button SB1 35, weft feeding start travel switch SQ1 36, weft feeding end travel switch SQ 37, fuse FU 38 and related contacts. The time relay KT contact 30 is set to power-on delay disconnection; the weft feeding start travel switch SQ1 36 is set to the normally open state; the weft feeding end travel switch SQ 37 is set to the normally closed state; the weft detection proximity switch SQ2 18 is set to the normally open state, etc.

[0034] The weft feed button SB1 and the cloth collection pause button SB2 can be used for emergency standby or maintenance when the loom or the weft shuttle 1 is abnormal or fails.

[0035] The connection mode of the electrical control circuit is as follows: the input end of the transformer 380V / TC 26 is connected to the L1 and L2 phase lines, and the output end is respectively connected between the intersections a and i at both ends of the control circuit, the weft detection proximity switch SQ2 18 and the weft feeding button SB135 are connected in parallel between the intersections b and d, the weft feeding start travel switch SQ1 36 is connected between the intersections c and d, the weft feeding end travel switch SQ 37 is connected between the intersections c and e, the cloth collection pause button SB2 32 is connected between the intersections b and g, the time relay KT coil 31 is connected between the intersections g and i, the time relay KT contact 30 is connected between the intersections g and h, the fuse FU 38 is connected between the intersections a and b, the weft feeding AC contactor coil KM1 27, the auxiliary AC contactor coil KM2 28, and the cloth collection control AC contactor coil KM3 29 are respectively connected between the intersections e and i, f and i, h and i, and the contacts KM1-1, KM1-2, KM1-3, KM2-1, KM2-2, KM3-1, KM3-2 are respectively connected between the intersections j and k, b and c, d and f, b and d, d and g, l and m, b and g. In addition, the installation of the cloth receiving control electromagnet YT2 33, the feeding electromagnet YT1 34, the feeding start travel switch SQ1 36 and the feeding end travel switch SQ37 are all conventional technologies, and can be based on the installation position of the automatic yarn feeding device of the Chinese patent document with patent number ZL01221284.9.

[0036] The contact 30 of the time relay KT is set to be disconnected after power-on delay, ensuring that after the weft feeding action is completed, the power-on time of the cloth collection control AC contactor KM3 29 is appropriately extended (i.e., the cloth collection time is extended) before disconnection, so as to avoid the phenomenon of missing wefts in the linen cloth caused by the cloth collection action occurring at the moment when the weft insertion starts after the weft shuttle 1 is fed. The yarn feeding start travel switch SQ1 36 is set to the normally open state, and the arc length of the metal collision block matched with it should be moderate, and slightly adjusted forward by a small angle (compared with the corresponding travel switch of patent number ZL01221284.9), so as to slightly advance the closing action time of the yarn feeding start travel switch SQ1 36, so as to ensure that the yarn feeding start travel switch SQ1 36 is powered on in advance and the contact KM1-2 is fully closed, so as to ensure that the yarn feeding time is long enough to allow the yarn to be completely pushed into the cavity of the weft shuttle 1.

[0037] The electrical control circuit completes the weft detection and weft feeding work by cooperating with the weft detection and weft feeding device. The working principle of the control circuit is: when the weft detection proximity switch SQ2 (or the weft feeding button SB1) is closed, the weft detection ends, the auxiliary AC contactor coil KM2 is energized, the contacts KM2-1 and KM2-2 are closed, the time relay KT coil is energized, the cloth receiving control AC contactor coil KM3 is energized, the contacts KM3-1 and KM3-2 are closed, the cloth receiving control electromagnet YT2 is turned on, the cloth receiving is temporarily stopped, and the weft feeding state begins; when the weft feeding start travel switch SQ1 collides with the metal collision block matched with it and closes, the weft feeding AC contactor coil KM1 is energized, the contacts KM1-1 and KM1-2 are closed, and the contact KM1-3 is disconnected. At this time, the weft feeding electromagnet YT1 is turned on and the weft feeding begins. At the same time, the power supply of the auxiliary AC contactor coil KM2 is cut off due to the disconnection of the contact KM1-3, and the contacts KM2-1 and KM2-2 are disconnected accordingly, thereby cutting off the power supply between the weft detection proximity switch SQ2 (or the weft feeding button SB1) to prevent repeated weft feeding after weft feeding. The weft feeding state is maintained continuously due to the closure of the contact KM1-2, and the weft feeding ends only after the travel switch SQ is disconnected at the end of weft feeding. Afterwards, when the delay time set by the time relay KT is reached, its contacts are immediately disconnected, the extended suspension time of cloth collection ends, and the loom cloth collection starts again.

[0038] When the sisal yarn loom is working, the weft shuttle pulls the weft yarn back and forth in the shuttle bed. Every time the weft shuttle inserts the weft and pauses in the left shuttle box of the shuttle bed, the weft detection proximity switch will detect the weft detection sensor block built into the weft shuttle. The reel becomes shorter and shorter due to the withdrawal of the weft insertion, and the squeezing of the reel-transferring conduction rod is gradually reduced. The spring pushes the weft detection sensor block to gradually move toward the slot of the weft shuttle cavity. When the reel is almost withdrawn, the limit screw approaches and supports the stop pin (at this time, the distance between the weft detection proximity switch and the weft detection sensor block reaches the specified value). The induction between the weft detection proximity switch and the weft detection sensor block is closed, and the cloth collection control electromagnet suspends cloth collection. After a while, the in-spooling start stroke switch is closed, and the weft shuttle returns to the in-spooling device of the right shuttle box. The in-spooling device automatically pushes the reel into the weft shuttle cavity slot, and then the in-spooling end stroke switch is disconnected, the in-spooling ends, and the weft shuttle enters the next round of weft insertion shuttle stroke.

[0039] In this embodiment, in order to facilitate a full understanding of the working principle of the present invention, a more specific and detailed description is given below: Before the sisal yarn loom is operated, the weft shuttle 1 with the installed winding rod is first placed in the right shuttle box 25 of the shuttle bed 13. When the loom is operating, each time the weft shuttle 1 is wound, the winding-changing conductive rod 8 of the present invention is squeezed by the winding rod to the groove 7 close to the bottom of the weft shuttle cavity, and at the same time, the winding rod is clamped by the tension brush in the weft shuttle 1 and the groove of the shuttle cavity. When the weft shuttle 1 is inserted back and forth between the left and right shuttle boxes 25 of the shuttle bed 13, the winding rod in the weft shuttle 1 will become shorter and smaller due to the reduction of the yarn strip due to the decomposition, and the winding-changing conductive rod 8 is squeezed by the winding rod less and less. Under the thrust of the spring 3, the weft sensing block 2 continuously moves out of the cavity notch of the weft shuttle 1. Every time the weft shuttle 1 reaches the left shuttle box 25 of the shuttle bed 1 and pauses, the weft detection proximity switch 18 will detect the weft detection sensor block 2. When the weft yarn in the reel is only 2-4 turns (about 20-50cm) left, the weft detection sensor block 2 moves close to the limit toward the slot of the weft shuttle 1 cavity. When the limit screw 5 supports the stop pin 6, the distance between the weft detection proximity switch 18 and the weft detection sensor block 2 reaches the specified value, the weft detection proximity switch 18 senses and closes, the weft detection ends, the cloth collection control electromagnet 33 generates a pause cloth collection action, and begins to enter the advance reel state; when the cam shaft of the loom rotates about 180°, the advance reel start travel switch SQ1 36 collides with the metal collision block matched with the camshaft and closes, and the feeding action starts. When the weft shuttle 1 returns to the feeding device of the right shuttle box of the shuttle bed, the feeding device automatically pushes the winding rod into the cavity of the weft shuttle 1, and then the feeding end stroke switch 37 is disconnected. The feeding ends, and the weft shuttle 1 then enters the next round of weft insertion shuttle stroke. The entire weaving process of the loom is basically fully automated.

[0040] The above disclosure is only a structure and control process of the automatic weft detection and feeding device of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Any equivalent changes made within the scope of the present invention are still within the scope covered by the present invention.

Claims

1. An automatic weft-feeding device for a sisal yarn loom, the automatic weft-feeding device being connected to an electrical control circuit, characterized in that: The automatic weft detection and feeding device comprises a weft shuttle (1), and a variable conduction rod (8) built in the weft shuttle (1), a weft detection sensing block (2) is arranged at the left end of the variable conduction rod (8), a spring (3) is arranged inside the weft detection sensing block (2), the spring (3) is fixed in the weft shuttle (1) by a first bolt (4), the right end of the variable conduction rod (8) is movably mounted on the shaft hole of a support (10) by a small shaft (9), the support (10) is fixed to one side of a yarn guide groove (12) of the weft shuttle (1) by a second bolt (11), a limit screw (5) is arranged on the outer side of the left end of the variable conduction rod (8), a stop pin (6) is arranged directly above the limit screw (5), and the stop pin (6) is arranged at the slot opening of the weft shuttle (1) cavity and connects the two walls of the cavity; The left and right shuttle boxes (25) are respectively arranged at the left and right ends of a shuttle bed of a sisal yarn loom, the left and right shuttle boxes (25) respectively comprising a shuttle bed (13), and a front shuttle blocking plate (15), an upper shuttle blocking plate (23) and a rear shuttle blocking plate (24) mounted on the shuttle bed (13), the axial outer sides of the left and right shuttle boxes (25) are further provided with leather knots (14), and the front shuttle blocking plate (15) is fixed to the shuttle bed (13) by a fourth bolt (21) and a fifth bolt (22); The cavity bottom plate of the weft shuttle (1) is provided with a groove (7) along the middle line, and the groove (7) can be an extension space for the variable conduction rod (8) to swing up and down; The variable transmission rod (8) is a concave structure. The limit screw (5) of the variable transmission rod (8) is height-adjustable. The limit screw (5) cooperates with the stop pin (6) to transmit a weft detection end signal. The variable transmission rod (8) swings up and down around the support 10 through the interaction of the spring (3) and the small shaft (9). A bracket (17) is fixed to the left front of the front shuttle blocking plate (15) of the left shuttle box (25) via a third bolt (16); the bracket (17) is provided with an elongated hole (19), and a weft detection proximity switch (18) is provided in the elongated hole (19); The front shuttle plate (15) of the left shuttle box (25) is provided with an elongated detection hole (20), the detection hole (20) corresponds to the elongated hole (19), and the weft detection proximity switch (18) detects the weft yarn through the detection hole (20); The electrical control circuit comprises a transformer 380V / TC (26), a weft feeding AC contactor coil KM1 (27), an auxiliary AC contactor coil KM2 (28), a cloth receiving control AC contactor coil KM3 (29), a time relay, a cloth receiving pause button SB2 (32), a cloth receiving control electromagnet YT2 (33), a weft feeding electromagnet YT1 (34), a weft feeding button SB1 (35), a weft feeding start travel switch SQ1 (36), a weft feeding end travel switch SQ (37), a fuse FU (38), and a weft detection proximity switch; The input end of the transformer 380V / TC (26) is connected to the L1 and L2 phase lines.

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