Thread passing mechanism of a double-needle single-station sewing machine

Abstract

The present invention discloses a thread passing mechanism of a double-needle single-station sewing machine. The double-needle single-station sewing machine comprises a first needle and a second needle, and both the first needle and the second needle have a working state and a non-working state. The thread passing mechanism comprises a thread fixing unit for fixing the thread pulled by the first needle or the second needle in the non-working state, and a stabilizing unit for stabilizing the sewing trace of the first needle or the second needle in the working state. Two needles can be installed on the head of the sewing machine, but there is only one station when working, that is, only one needle can work. By setting the thread fixing unit, the thread that has finished sewing can be fixed when the needle and the thread are replaced for sewing; in addition, by setting the stabilizing unit, the tension of the thread that performs the sewing work can be controlled when the needle and the thread are replaced for sewing, so as to stably maintain the trace of the thread sewn on the cloth surface, so as to optimize the trace.

Description

Technical Field

[0001] The invention belongs to the technical field of sewing equipment, and in particular relates to a thread passing mechanism of a double-needle single-station sewing machine. Background Art

[0002] Traditional sewing machines are all single-needle sewing machines, so for fabrics that need double-thread or multi-thread sewing, it needs to be sewn multiple times. In order to improve sewing efficiency, there are various types of double-needle sewing machines on the market. Double-needle sewing machines generally use double needles to sew double threads at the same time. After sewing, the double threads are parallel to each other, but the fixed double needles sew at the same time, and the spacing between the double threads after sewing is generally equidistant. For some more unique special-shaped patterns, it cannot sew, and its application is limited; although the single-needle sewing machine is more flexible in the face of unique special-shaped patterns, its efficiency is low, and when two-color double-thread sewing is required, the only way is to change the stitching thread pulled by the needle to another color, or directly transfer the fabric to another sewing machine with the stitching thread of the required color for sewing. No matter which solution is used, the efficiency is very low.

[0003] Since the shuttle in the sewing machine rotates clockwise, when the fabric moves in the conventional sewing direction, the stitches on the fabric are called forward stitches. When the fabric is sewn in the reverse direction, the shuttle still rotates clockwise, and the stitches on the fabric are called reverse stitches. Regardless of whether it is forward or reverse sewing, the thread tension must be effectively controlled. For example, too little thread tension may result in poor stitches such as knotted loops and poor thread collection; too much tension may cause skipped stitches, thread breakage, pattern deviation and other poor stitches. Especially when the fabric is sewn in the reverse direction or in a special shape other than a straight line, the tension at the needle tip is particularly difficult to control stably.

[0004] There is currently a double-needle single-station sewing machine, which has two needles on its head. The two needles can respectively pull sutures of different colors. When sewing, only one needle will do the sewing work, and the other will remain motionless. When it is necessary to change the color of suture for sewing, the sewing machine will switch to the other needle for sewing. There is no need to change the thread or change the fabric to another device for sewing, which greatly improves work efficiency and reduces production costs. It can also flexibly respond to unique special-shaped patterns. However, when the fabric is moved in forward, reverse, and special shapes for sewing, how to stably control the tension of the sutures pulled by the two alternating needles to maintain good stitches has become a problem that technical personnel in this field need to consider. Summary of the invention

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

[0006] A thread passing mechanism of a double-needle single-station sewing machine, the double-needle single-station sewing machine has a first needle and a second needle, and the first needle and the second needle both have a working state and a non-working state. When the first needle is in the working state, the second needle is in the non-working state, and when the second needle is in the working state, the first needle is in the non-working state. The thread passing mechanism includes a thread fixing unit for fixing the suture pulled by the first needle or the second needle in the non-working state, and a stabilizing unit for stabilizing the sewing stitch of the first needle or the second needle in the working state.

[0007] Preferably, the stabilization unit includes a tension control mechanism for controlling the tension of the suture pulled by the first needle or the second needle in a working state, the tension control mechanism includes a first support seat, a first clamping assembly arranged on the first support seat for clamping or releasing the suture pulled by the first needle in a working state to adjust its tension, a second clamping assembly arranged on the first support seat for clamping or releasing the suture pulled by the second needle in a working state to adjust its tension, and a first driving assembly arranged on the first support seat and driving the first clamping assembly and the second clamping assembly to move.

[0008] Preferably, the first clamping assembly and the second clamping assembly both include a first clip and a second clip that can be brought close to each other to press and clamp the suture, the first clip is fixedly arranged, and the second clip is movable relative to the first clip.

[0009] Preferably, the first driving component includes a first pressing plate that can be pressed against the second clamp, a first pressing seat fixed on the first supporting seat, a first elastic member arranged between the first pressing plate and the first pressing seat and tending to push the first pressing plate toward the second clamp, and a first pushing component tending to push the first pressing plate away from the second clamp.

[0010] Preferably, the stabilizing unit further comprises an auxiliary mechanism for assisting the tension control mechanism in controlling the thread tension, and the auxiliary mechanism is located upstream of the tension control mechanism in the thread feeding direction of the sewing machine.

[0011] Preferably, the auxiliary mechanism includes a second support seat, a third clamping assembly arranged on the second support seat and used for clamping or releasing the suture pulled by the first needle in a working state to adjust its tension, a fourth clamping assembly arranged on the second support seat and used for clamping or releasing the suture pulled by the second needle in a working state to adjust its tension, and a second driving assembly arranged on the second support seat and driving the third clamping assembly and the fourth clamping assembly to operate.

[0012] Preferably, the third clamping assembly and the fourth clamping assembly both include a third clip and a fourth clip that can be brought close to each other to press and clamp the suture, the third clip is fixedly arranged, and the fourth clip is movable relative to the third clip.

[0013] Preferably, the second driving assembly includes a second pressing plate that can be pressed against the fourth clamp, a second pressing seat fixed on the second supporting seat, a second elastic member arranged between the second pressing plate and the second pressing seat and tending to push the second pressing plate toward the fourth clamp, and a second pushing assembly tending to push the second pressing plate away from the fourth clamp.

[0014] Preferably, two of each of the second pressure piece, the second pressure seat and the second elastic member are respectively provided, the second pushing assembly includes a second ejector pin which passes through the third clamp and the fourth clamp and has one end in contact with the side of the second pressure piece away from the second elastic member, and a swinging paddle arranged on the second support seat, the other end of the second ejector pin is fixed on the paddle, and the pushing assembly also includes a driving cylinder for driving the paddle to swing, and the extension direction of the power output shaft of the driving cylinder is perpendicular to the plane where the paddle is located.

[0015] Preferably, the thread fixing unit is located between the stabilizing unit and the needle in the thread feeding direction of the sewing machine, and the thread fixing unit includes a fixing seat, a first fixing mechanism arranged on the fixing seat for fixing the suture pulled by the first needle in a non-working state, and a second fixing mechanism arranged on the fixing seat for fixing the suture pulled by the second needle in a non-working state.

[0016] Compared with the prior art, the present invention is beneficial in that:

[0017] The thread-passing mechanism of the double-needle single-station sewing machine of the present invention can be equipped with two needles on the sewing machine head, but there is only one station when working, that is, only one needle can work. By providing a thread fixing unit, when the needle and thread are replaced for sewing, the thread that has finished sewing can be fixed, and no matter which set of the two sets of needles and threads finishes the work, the thread can be fixed; in addition, by providing a stabilizing unit, when the needle and thread are replaced for sewing, the tension of the thread that performs the sewing work can be controlled to stably maintain the stitches of the thread sewn on the cloth surface, so that the stitches are optimized, and no matter which set of the two sets of needles and threads is performing the sewing work, its stitches can be optimized.

[0018] Furthermore, the thread passing mechanism of the double-needle single-station sewing machine of the present invention includes a tension control mechanism and an auxiliary mechanism in its stabilizing unit. The tension control mechanism can optimize the forward and conventional stitches by itself, and the auxiliary mechanism can assist the tension control mechanism in controlling the tension of the running suture when the sewing machine performs reverse sewing or special-shaped sewing, so as to avoid the situation that the tension control mechanism cannot effectively control the tension of the suture during reverse sewing and special-shaped sewing, thereby optimizing the reverse stitches and special-shaped stitches during reverse sewing and special-shaped sewing. Avoid situations such as knotting loops and poor thread collection caused by too low thread tension, and situations such as skipped stitches, thread breakage, and pattern deviation caused by too much tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a double-needle single-station sewing machine and a thread-passing mechanism thereon of the present invention;

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the wire fixing unit of the present invention (the first fixing mechanism is exploded);

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the tension control mechanism of the present invention;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the auxiliary mechanism of the present invention;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the auxiliary mechanism of the present invention (after explosion);

[0025] Wherein: 10, line fixing unit; 11, fixing seat; 12, cylinder; 13, connecting sleeve; 130, line hole; 14, pressing screw; 20, tension control mechanism; 200, first support seat; 21, first clamp; 22, second clamp; 23, first elastic member; 24, first pressing seat; 25, first ejector pin; 26, ejector block; 27, ejector rod; 30, auxiliary mechanism; 300, second support seat; 31, third clamp; 32, fourth clamp; 33, second pressing plate; 34, second elastic member; 35, second pressing seat; 36, second ejector pin; 37, pick; 38, driving cylinder; 40, detection unit; 41, support plate; 42, detection element; 50, line hooking device; Z1, first needle; Z2, second needle. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] like Figures 1 to 5 As shown, a thread passing mechanism of a double-needle single-station sewing machine, the double-needle single-station sewing machine has a first needle Z1 and a second needle Z2, and the first needle Z1 and the second needle Z2 both have a working state and a non-working state, when the first needle Z1 is in the working state, the second needle Z2 is in the non-working state, when the second needle Z2 is in the working state, the first needle Z1 is in the non-working state, the thread passing mechanism includes a thread fixing unit 10 for fixing the suture pulled by the first needle Z1 or the second needle Z2 in the non-working state, a stabilizing unit for stabilizing the sewing stitch of the first needle Z1 or the second needle Z2 in the working state, and a detection unit 40 for detecting whether the suture pulled by the first needle Z1 or the second needle Z2 in the working state is broken or fallen off.

[0028] Specifically, the thread fixing unit 10 is located between the stabilizing unit and the needle in the thread feeding direction of the sewing machine, and the thread fixing unit 10 includes a fixing seat 11, a first fixing mechanism arranged on the fixing seat 11 for fixing the suture pulled by the first needle Z1 in a non-working state, and a second fixing mechanism arranged on the fixing seat 11 for fixing the suture pulled by the second needle Z2 in a non-working state.

[0029] The first fixing mechanism includes a connecting sleeve 13 fixed on the fixing seat 11, a cylinder 12 arranged on the inner circumference of the connecting sleeve 13, and a pressing screw 14 arranged on the inner circumference of the connecting sleeve 13. A thread passing hole 130 is opened on the connecting sleeve 13 and is arranged along its radial direction. The suture pulled by the first needle Z1 passes through the thread passing hole 130; when the first needle Z1 finishes working and is sewn by the second needle Z2, the suture pulled by the first needle Z1 needs to be cut off (cut at the position where the suture is connected to the cloth surface), and the free end of the suture after cutting is hooked by the thread hooking device 5050, and the rear side of the suture is fixed by the first fixing mechanism. When fixed, the output shaft of the cylinder 12 pushes out the suture passing through the thread passing hole 130 and presses it against the pressing screw 14, so that the suture is fixed and cannot move freely, so as to avoid the suture from loosening to the needle tip on a large scale due to looseness at the back, vibration during machine operation, etc. when no sewing task is performed.

[0030] The second fixing mechanism is used to fix the cut suture thread when the second needle Z2 finishes working and the first needle Z1 starts sewing. The specific structural setting of the second fixing mechanism is exactly the same as that of the first fixing mechanism, and will not be repeated here.

[0031] Furthermore, the stabilizing unit includes a tension control mechanism 20 for controlling the tension of the suture pulled by the first needle Z1 or the second needle Z2 in the working state, and the tension control mechanism 20 includes a first support seat 200, a first clamping assembly disposed on the first support seat 200 for clamping or releasing the suture pulled by the first needle Z1 in the working state to adjust its tension, a second clamping assembly disposed on the first support seat 200 for clamping or releasing the suture pulled by the second needle Z2 in the working state to adjust its tension, and a first driving assembly disposed on the first support seat 200 and driving the first clamping assembly and the second clamping assembly to operate. In addition, the stabilizing unit also includes an auxiliary mechanism 30 for assisting the tension control mechanism 20 in controlling the tension of the suture, and the auxiliary mechanism 30 is located upstream of the tension control mechanism 20 in the thread feed direction of the sewing machine. The auxiliary mechanism 30 includes a second support seat 300, a third clamping assembly arranged on the second support seat 300 and used for clamping or releasing the suture pulled by the first needle Z1 in a working state to adjust its tension, a fourth clamping assembly arranged on the second support seat 300 and used for clamping or releasing the suture pulled by the second needle Z2 in a working state to adjust its tension, and a second driving assembly arranged on the second support seat 300 and driving the third clamping assembly and the fourth clamping assembly to operate.

[0032] Before the sewing machine is operated, the same batch of products will be programmed with a corresponding control program according to the fabric sewing trajectory. When the tension control mechanism 20 and the auxiliary mechanism 30 are performing tension control, they will act according to the corresponding control program to control the tension of the suture.

[0033] The tension control mechanism 20 can maintain the stability of the forward and conventional stitches and optimize the stitches by controlling the tension of the suture. However, when facing reverse stitches, especially special-shaped stitches, the tension control mechanism 20 cannot control in time, resulting in delayed tension control and the problem of poor stitches will still occur.

[0034] Therefore, when the sewing machine sews the fabric in the reverse direction or in a special shape other than a straight line, the tension control mechanism 20 can be used for primary control, and the auxiliary mechanism 30 can be used to further perform secondary tension control on the suture, thereby effectively avoiding the poor stitching caused by the tension control delay caused by the untimely control of the tension control mechanism 20, and the stitching is significantly optimized.

[0035] In this example, the first clamping assembly and the second clamping assembly both include a first clip 21 and a second clip 22 that can be brought together to press and clamp the suture, the first clip 21 is fixed, and the second clip 22 is movable relative to the first clip 21. The first driving assembly includes a first pressing piece that can be pressed and brought together with the second clip 22, a first pressing seat 24 fixed on the first support seat 200, a first elastic member 23 provided between the first pressing piece and the first pressing seat 24 and tending to push the first pressing piece to move toward the second clip 22, and a first pushing assembly tending to push the first pressing piece away from the second clip 22. There are two first pressing plates, two first pressing seats 24 and two first elastic members 23 respectively, and the first pushing assembly includes two first thimbles 25 respectively passing through the first clamps 21 and the second clamps 22 and with one end thereof abutting against the side of the first pressing plates away from the first elastic member 23, a push block 26 fixed to the other end of the two first thimbles 25, and a push rod 27 connected to the push block 26, and the push rod 27 is connected to the solenoid valve of the sewing machine.

[0036] In addition, the third clamping assembly and the fourth clamping assembly both include a third clamping piece 31 and a fourth clamping piece 32 that can be brought close to each other to press and clamp the suture, the third clamping piece 31 is fixed, and the fourth clamping piece 32 is movable relative to the third clamping piece 31. The second driving assembly includes a second pressing piece 33 that can be pressed and brought close to the fourth clamping piece 32, a second pressing seat 35 fixed on the second supporting seat 300, a second elastic member 34 provided between the second pressing piece 33 and the second pressing seat 35 and tending to push the second pressing piece 33 to move close to the fourth clamping piece 32, and a second pushing assembly tending to push the second pressing piece 33 away from the fourth clamping piece 32. There are two second pressing pieces 33, two second pressing seats 35, and two second elastic members 34, respectively. The second push assembly includes a second ejector pin 36 that passes through the third clamp 31 and the fourth clamp 32 and one end of which contacts the side of the second pressing piece 33 away from the second elastic member 34, and a swinging paddle 37 provided on the second support seat 300. The other end of the second ejector pin 36 is fixed on the paddle 37. The push assembly also includes a drive cylinder 38 (only one drive cylinder 38 is provided) that drives the paddle 37 to swing. The extension direction of the power output shaft of the drive cylinder 38 is perpendicular to the plane where the paddle 37 is located. The paddle 37 is not completely fitted with the second support seat 300, but a gap is left, so that the paddle 37 can swing on the second support seat 300 through two fulcrums.

[0037] When the tension of the suture is controlled, the first clamp 21 and the second clamp 22 will frequently move close to or away from each other. When they move close to each other, the suture is clamped, and when they move away from each other, the suture is loosened. Under normal circumstances, the first elastic member 23 always pushes the first pressing piece, and the first pressing piece forces the second clamp 22 to press against the first clamp 21, and the suture is clamped. When it needs to be loosened, the solenoid valve of the sewing machine will push the push rod 27, and the push rod 27 will push the push block 26. The push block 26 can push the two first push pins 25 at the same time. The two first push pins 25 overcome the thrust of the first elastic member 23 and push the corresponding two first pressing pieces away from the second clamp 22. At this time, the second clamp 22 is no longer pressed against the first clamp 21, and the suture is loosened. When the suture needs to be clamped, the components can move in the opposite direction.

[0038] When the tension of the suture is controlled, the third clamp 31 and the fourth clamp 32 will frequently move close to or away from each other. When they are close to each other, the suture is clamped, and when they are away from each other, the suture is loosened. Under normal circumstances, the second elastic member 34 always pushes the second pressing piece 33, and the second pressing piece 33 forces the fourth clamp 32 to press against the third clamp 31, and the suture is clamped. When it is necessary to loosen, the telescopic rod of the drive cylinder 38 is extended, and the paddle 37 is deflected, which drives the two second ejector pins 36 thereon to move. The two second ejector pins 36 push the corresponding two second pressing pieces 33 to overcome the thrust of the second elastic member 34 and make each second pressing piece 33 move away from the corresponding fourth clamp 32. At this time, the fourth clamp 32 and the third clamp 31 are no longer pressed against each other, and then the suture is loosened. When the suture needs to be clamped, the components can move in the opposite direction.

[0039] The tension control mechanism 20 and the auxiliary mechanism 30 are mainly aimed at the suture pulled by the first needle Z1 or the second needle Z2 in the working state, that is, the purpose is only to control one of the two sutures that is moving, but when clamping or releasing the suture, the two clamping components in each mechanism clamp or release the two sutures at the same time, while the other suture does not move and is in a non-working state, so clamping or releasing it will not affect the sewing work.

[0040] In this example, the detection unit 40 includes a support plate 41 and two detection elements 42 arranged on the support plate 41. Both detection elements 42 have channels for the passage of sutures. When the thread breaks or the thread on the needle pillow falls off, the suture in the channel will not move. The detection element 42 will find that the suture is not in a normal sewing process and an abnormality has occurred. At this time, the system can control the sewing mechanism to stop running to avoid losses.

[0041] In summary, the thread-passing mechanism of the double-needle single-station sewing machine of the present invention can be equipped with two needles on the sewing machine head, but there is only one station when working, that is, only one needle can work. By providing a thread fixing unit, it can meet the requirement of fixing the suture that has finished sewing when the needle and thread are replaced for sewing, and the suture can be fixed no matter which set of the two sets of needles and threads finishes the work; in addition, by providing a stabilizing unit, it can meet the requirement of controlling the tension of the suture that performs the sewing work when the needle and thread are replaced for sewing, so as to stably maintain the stitches of the sutures sewn on the cloth surface, so that the stitches are optimized, and the stitches can be optimized no matter which set of the two sets of needles and threads is performing the sewing work.

[0042] Furthermore, the thread passing mechanism of the double-needle single-station sewing machine of the present invention includes a tension control mechanism and an auxiliary mechanism in its stabilizing unit. The tension control mechanism can optimize the forward and conventional stitches by itself, and the auxiliary mechanism can assist the tension control mechanism in controlling the tension of the running suture when the sewing machine performs reverse sewing or special-shaped sewing, so as to avoid the situation that the tension control mechanism cannot effectively control the tension of the suture during reverse sewing and special-shaped sewing, thereby optimizing the reverse stitches and special-shaped stitches during reverse sewing and special-shaped sewing. Avoid situations such as knotting loops and poor thread collection caused by too low thread tension, and situations such as skipped stitches, thread breakage, and pattern deviation caused by too much tension.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A thread passing mechanism for a double-needle single-station sewing machine, characterized in that: The double-needle single-station sewing machine has a first needle and a second needle, and the first needle and the second needle both have a working state and a non-working state. When the first needle is in a working state, the second needle is in a non-working state, and when the second needle is in a working state, the first needle is in a non-working state. The thread passing mechanism includes a thread fixing unit for fixing the suture pulled by the first needle or the second needle in a non-working state, and a stabilizing unit for stabilizing the sewing stitches of the first needle or the second needle in a working state. The stabilizing unit includes a tension control mechanism for controlling the tension of the suture pulled by the first needle or the second needle in working state, and an auxiliary mechanism for assisting the tension control mechanism in controlling the tension of the suture, wherein the auxiliary mechanism is located upstream of the tension control mechanism in the thread feed direction of the sewing machine; the tension control mechanism is used to self-optimize the forward and conventional stitches, and the auxiliary mechanism is used to assist the tension control mechanism in controlling the tension of the running suture when the sewing machine performs reverse sewing or special-shaped sewing; The auxiliary mechanism includes a second support seat, a third clamping assembly arranged on the second support seat for clamping or releasing the suture pulled by the first needle in a working state to adjust its tension, a fourth clamping assembly arranged on the second support seat for clamping or releasing the suture pulled by the second needle in a working state to adjust its tension, and a second driving assembly arranged on the second support seat and driving the third clamping assembly and the fourth clamping assembly to move; The third clamping assembly and the fourth clamping assembly both include a third clamping piece and a fourth clamping piece that can be brought close to each other to press and clamp the suture, the third clamping piece is fixedly arranged, and the fourth clamping piece is movable relative to the third clamping piece; The second driving assembly includes a second pressing piece capable of pressing and approaching the fourth clamping piece, a second pressing seat fixed on the second supporting seat, a second elastic member disposed between the second pressing piece and the second pressing seat and tending to push the second pressing piece toward the fourth clamping piece, and a second pushing assembly tending to push the second pressing piece away from the fourth clamping piece; The second pressing piece, the second pressing seat, and the second elastic member are respectively provided with two, the second pushing assembly includes a second ejector pin that passes through the third clamp and the fourth clamp and has one end in contact with the side of the second pressing piece away from the second elastic member, and a swinging paddle arranged on the second supporting seat, the other end of the second ejector pin is fixed to the paddle, the second pushing assembly also includes a driving cylinder that drives the paddle to swing, and the extension direction of the power output shaft of the driving cylinder is perpendicular to the plane where the paddle is located; the paddle is not completely fitted with the second supporting seat, and a spacing space is left between the two, so as to enable the paddle to swing on the second supporting seat through two fulcrums; The thread fixing unit is located between the stabilizing unit and the needle in the thread feeding direction of the sewing machine, and the thread fixing unit includes a fixing seat, a first fixing mechanism arranged on the fixing seat for fixing the suture pulled by the first needle in a non-working state, and a second fixing mechanism arranged on the fixing seat for fixing the suture pulled by the second needle in a non-working state; The thread passing mechanism also includes a detection unit for detecting whether the suture pulled by the first needle or the second needle in a working state is broken or fallen off, and the detection unit includes a support plate and two detection elements arranged on the support plate, and both of the two detection elements have a channel for the suture to pass through; When the first needle finishes working and the second needle starts sewing, the suture thread pulled by the first needle needs to be cut off, and the free end of the suture thread after cutting is hooked by the thread hooking device.

2. The thread passing mechanism of the double-needle single-station sewing machine according to claim 1 is characterized in that: The tension control mechanism includes a first support seat, a first clamping assembly arranged on the first support seat for clamping or releasing the suture pulled by the first needle in a working state to adjust its tension, a second clamping assembly arranged on the first support seat for clamping or releasing the suture pulled by the second needle in a working state to adjust its tension, and a first driving assembly arranged on the first support seat and driving the first clamping assembly and the second clamping assembly to move.

3. The thread passing mechanism of the double-needle single-station sewing machine according to claim 2 is characterized in that: The first clamping assembly and the second clamping assembly both include a first clamping piece and a second clamping piece that can be brought close to each other to press and clamp the suture, the first clamping piece is fixedly arranged, and the second clamping piece is movable relative to the first clamping piece.

4. The thread passing mechanism of the double-needle single-station sewing machine according to claim 3 is characterized in that: The first driving component includes a first pressing piece that can be pressed and brought close to the second clamp, a first pressing seat fixed on the first supporting seat, a first elastic member arranged between the first pressing piece and the first pressing seat and tending to push the first pressing piece to move closer to the second clamp, and a first pushing component tending to push the first pressing piece away from the second clamp.

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