Adjusting mechanism for thread passing of sewing machine and sewing machine

Abstract

The invention discloses an adjusting mechanism for thread passing of a sewing machine and the sewing machine, and relates to the technical field of sewing machines, and the adjusting mechanism for thread passing of the sewing machine comprises a mounting seat, a thread passing mechanism and a thread passing mechanism, the at least one movable wire assembly is provided with strip-shaped wire passing holes, and the strip-shaped wire passing holes and the wire passing holes are alternately arranged; the driving assembly is used for driving the movable wire assembly to move or stop, so that the strip-shaped wire passing hole and the adjacent wire passing holes on the two sides of the strip-shaped wire passing hole form a broken wire channel or a straight wire channel; according to the adjusting mechanism for thread passing of the sewing machine and the sewing machine, a broken line channel or a straight line channel is formed through the internal thread moving assembly and the thread passing holes in the two sides, so that the thread inlet resistance of the sewing thread is changed, it is guaranteed that when different pieces of cloth are sewn, thread rings can have the same tightening degree, thread ends can be drawn back, and the sewing quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, and more specifically, to a thread-passing adjustment mechanism for a sewing machine. In addition, the present invention also relates to a sewing machine comprising the thread-passing adjustment mechanism. Background Art

[0002] The sewing machine is equipped with a thread take-up lever and a thread clamp. When the sewing machine is working, the main function of the thread take-up lever is to tighten the thread loop formed after the needle pierces the fabric, and at the same time provide traction for the thread feed. The thread clamp is located on the upstream side of the thread take-up lever, providing constant resistance for the thread feed. The stroke of the thread take-up lever is fixed, and the traction force it provides is fixed. When the sewing machine sews fabrics of different thicknesses and densities, the thread feed resistance of the sewing thread passing through the fabric is different. Therefore, the driving force required by the thread take-up lever to tighten the thread loop formed after the needle pierces the fabric is different. However, the thread feed resistance provided by the thread clamp is constant, which causes some thread loops to be unable to be tightened or to be too tight, affecting the sewing quality.

[0003] Moreover, after sewing is finished, the sewing thread on the needle needs to be cut short to form thread ends. At this time, due to the fixed stroke and traction force of the thread take-up rod, the thread ends of some fabrics with greater thread feed resistance cannot be completely pulled out and are exposed, which also affects the sewing quality.

[0004] To sum up, how to solve the problem that when a sewing machine sews different fabrics, the tightening force of the thread loop is inconsistent, and some thread ends cannot be pulled out and are exposed, thereby affecting the sewing quality, is an urgent problem that needs to be solved by technical personnel in this field. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a sewing machine thread adjustment mechanism, which forms a broken line path or a straight line path through the internal moving line component and the thread holes on both sides to change the feed resistance of the sewing thread, thereby ensuring that when sewing different fabrics, the thread loop can have the same tightening degree, and the thread ends can be pulled back to ensure the sewing quality.

[0006] Another object of the present invention is to provide a sewing machine including the above-mentioned sewing machine thread-passing adjustment mechanism, which has the same technical features and can solve the same technical problems.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A thread-guiding adjustment mechanism for a sewing machine, comprising:

[0009] The mounting base is provided with at least two wire holes;

[0010] At least one moving line component, which is provided with strip-shaped wire holes, and the strip-shaped wire holes are arranged alternately with the wire holes;

[0011] The driving component is used to drive the dynamic line component to move or stop, so that the strip-shaped wire-passing hole and the wire-passing holes adjacent to it on both sides form a broken line path or a straight line path.

[0012] Preferably, the moving direction of the moving line component is perpendicular to the line connecting the adjacent wire holes on both sides thereof;

[0013] and / or,

[0014] The movement direction of the dynamic line component is consistent with the strip length direction of the strip-shaped wire hole therein.

[0015] Preferably, the moving line assembly includes a line blocking assembly, and the line blocking assembly includes a first bar-shaped line passing hole, and the length direction of the first bar-shaped line passing hole is consistent with the movement direction of the line blocking assembly.

[0016] Preferably, the wire blocking assembly is fixedly connected to the telescopic head of the driving assembly through an adjusting screw. The adjusting screw can pass through any position of the first strip wire hole and then be fixedly connected to the telescopic head, and is used to adjust the maximum wire capacity of the broken line channel composed of the first strip wire hole and the adjacent wire holes on both sides thereof.

[0017] Preferably, the moving thread assembly includes a thread take-up assembly, the thread take-up assembly is mounted to rotate relative to the mounting seat, and the driving assembly is dynamically connected to the thread take-up assembly for driving the thread take-up assembly to rotate.

[0018] Preferably, the thread take-up assembly includes a second bar-shaped thread passing hole, and the second bar-shaped thread passing hole is an arc-shaped hole and the arc center overlaps with the rotation axis of the thread take-up assembly.

[0019] Preferably, the thread take-up assembly further comprises a first strip-shaped limiting hole and a coaxially rotatable rocker;

[0020] The first strip-shaped limiting hole is an arc-shaped hole, and the arc center overlaps with the rotation axis of the thread take-up assembly;

[0021] One end of the rocker arm is dynamically connected to the telescopic head of the driving assembly, and the other end is provided with a pin shaft slidably installed in the first strip limiting hole. When the telescopic head drives the rocker arm to swing, the pin shaft moves to the end of the first strip limiting hole, driving the thread picking assembly and the rocker arm to rotate synchronously.

[0022] Preferably, the telescopic head is hinged to the end of the rocker;

[0023] Alternatively, a second strip-shaped limiting hole is provided at the end of the rocker arm, and a pin shaft fixed vertically to the telescopic head is slidingly provided in the second strip-shaped limiting hole. When the telescopic head moves, the pin shaft is driven to slide in the second strip-shaped limiting hole, thereby driving the rocker arm to rotate.

[0024] Preferably, there are two moving line components, and the maximum wire capacity of the folding line channel composed of the strip-shaped wire holes and the wire holes of the two moving line components is different;

[0025] The driving assembly has at least one travel point, so that only the strip-shaped wire-passing hole of one of the moving line assemblies and the wire-passing holes adjacent to it on both sides form a broken line path.

[0026] A sewing machine comprising a thread clamp, a thread take-up lever and the thread-passing adjustment mechanism for a sewing machine as described above;

[0027] The thread clamp is arranged on the upstream side of the thread-passing adjustment mechanism of the sewing machine and is used to provide a constant thread feeding resistance;

[0028] The thread take-up lever is arranged on the downstream side of the thread-passing regulating mechanism of the sewing machine and is used for providing thread-feeding power.

[0029] The thread-passing adjustment mechanism for a sewing machine provided by the present invention has at least the following beneficial effects compared with the prior art:

[0030] The driving assembly drives the dynamic line assembly to move relative to the mounting seat, thereby changing the relative positions of the strip-shaped wire hole and the wire hole, and then forming a straight line path or a broken line path between the strip-shaped wire hole and its two adjacent wire holes. When the sewing thread passes through the broken line path, due to the bend in the line path, there is a radial force between the sewing thread and the wire hole and the strip-shaped wire hole at the bent position, resulting in an increase in the friction at the contact position, that is, an increase in the feed line group; and when the sewing thread passes through the straight line path, the radial force between the sewing thread and the wire hole and the strip-shaped wire hole is reduced or disappears, and the friction between the sewing thread and the wire hole and the strip-shaped wire hole is reduced, that is, the feed resistance is reduced;

[0031] During the sewing process, the position of the moving line assembly is adjusted by the drive assembly, and the curvature of the folding line is changed, so that the thread feeding resistance can be changed. Under the premise of providing the same driving force, the thread take-up lever can obtain different tightening forces of the thread loop, thereby making the thread loops of different fabrics have the same tightening degree, which is suitable for processing different fabrics.

[0032] After finishing sewing, the position of the moving line component is adjusted by the driving component to increase the bending degree of the folding line path at a time, that is, to increase the thread capacity of the folding line path, so that the thread clamp can increase the amount of thread retracted while maintaining the same amount of thread input, so that the thread end can be withdrawn, thereby ensuring the sewing quality.

[0033] The sewing machine provided by the present invention includes the above-mentioned sewing machine thread-passing adjustment mechanism and has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 This is a structural schematic diagram of the thread-passing adjustment mechanism of the sewing machine provided by the present invention in a normal sewing state;

[0036] Figure 2 This is a structural diagram of the thread-passing adjustment mechanism of the sewing machine provided by the present invention when the sewing thread is taken up after completion;

[0037] Figure 3 This is a schematic diagram of the assembly of the thread take-up assembly provided by the present invention;

[0038] Figure 4 This is a schematic assembly diagram of the thread take-up assembly provided by the present invention from another perspective;

[0039] Figure 5 This is a schematic structural diagram of the wire retaining assembly provided by the present invention and adjacent wire holes forming a broken line channel;

[0040] Figure 6 This is a structural schematic diagram of the thread take-up assembly provided by the present invention and adjacent thread holes forming a broken line channel.

[0041] In the picture:

[0042] 1. Drive assembly; 11. Telescopic head;

[0043] 2. Wire stop assembly; 21. Adjustment screw; 22. First strip-shaped wire hole;

[0044] 3. Thread take-up assembly; 31. Second strip-shaped thread hole; 32. First strip-shaped limit hole; 33. First shaft hole;

[0045] 4. Mounting seat; 41. First cable hole; 42. Second cable hole; 43. Third cable hole;

[0046] 5. Rocker; 51. Pin hole; 52. Second shaft hole; 53. Second strip-shaped limit hole;

[0047] 6. Thread clamp;

[0048] 7. Thread take-up lever; 71. Fourth thread hole. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0050] The core of the present invention is to provide an adjustment mechanism for thread passing in a sewing machine, which forms a broken line path or a straight line path through the internal moving line component and the thread passing holes on both sides to change the thread feed resistance of the sewing thread, thereby ensuring that the thread loops can have the same tightening degree when sewing different fabrics, and the thread ends can be pulled back to ensure the sewing quality.

[0051] Another core of the present invention is to provide a sewing machine including the above-mentioned sewing machine thread-passing adjustment mechanism, which has the same technical features and can solve the same technical problems.

[0052] Please refer to Figures 1-6 , a thread-adjusting mechanism for a sewing machine, comprising:

[0053] The mounting base 4 is provided with at least two wire holes;

[0054] At least one moving line component, which is provided with strip-shaped wire holes, and the strip-shaped wire holes are arranged alternately with the wire holes;

[0055] The driving component 1 is used to drive the dynamic line component to move or stop, so that the strip-shaped wire hole and the wire holes adjacent to it on both sides form a broken line path or a straight line path.

[0056] like Figure 1 As shown, the strip-shaped wire hole in the moving line assembly and the two wire holes in the mounting seat 4 together form a wire path. When the line connecting the strip-shaped wire hole and the wire hole overlaps, a straight wire path is formed between the strip-shaped wire hole and the wire hole. For example, when the first strip-shaped wire hole 22 overlaps with the line connecting the second wire hole 42 and the third wire hole 43, a straight wire path is formed between the three. At this time, when the sewing thread passes through the straight wire path, there is a smaller radial force between the sewing thread and the first strip-shaped wire hole 22, the second wire hole 42 and the third wire hole 43, that is, the first strip-shaped wire hole 22, the second wire hole 42 and the third wire hole 43 exert a smaller wire entry resistance on the sewing thread.

[0057] When the lines connecting the strip-shaped thread holes do not overlap, a zigzag line channel is formed between the strip-shaped thread holes and the thread holes. For example, when the lines connecting the first strip-shaped thread hole 22, the second thread hole 42 and the third thread hole 43 do not overlap, a zigzag line channel is formed between the three. At this time, when the sewing thread passes through the zigzag line channel, a large radial force is exerted between the sewing thread and the first strip-shaped thread hole 22, the second thread hole 42 and the third thread hole 43, that is, the first strip-shaped thread hole 22, the second thread hole 42 and the third thread hole 43 exert a large thread entry resistance on the sewing thread.

[0058] Moreover, as the distance between the first strip wire hole 22 and the line connecting the second wire hole 42 and the third wire hole 43 increases, the curvature of the fold line increases. At this time, the radial force between the sewing thread and the first strip wire hole 22, the second wire hole 42 and the third wire hole 43 increases, that is, the feed resistance exerted by the first strip wire hole 22, the second wire hole 42 and the third wire hole 43 on the sewing thread increases.

[0059] When the thickness of the sewing fabric is large or the density of the fabric is large, the thread feeding resistance will increase. At this time, the thread feeding resistance at the thread feeding end of the needle should be reduced, that is, the curvature of the broken line path should be reduced, or it should be directly changed to a straight line path. At this time, the traction force of the thread take-up lever 7 can be more distributed to the thread loop, so that the thread loop can obtain a greater tightening force, and then the thread loop can obtain a preset tightening degree, thereby avoiding the thread loop from not being tightened and ensuring the sewing quality;

[0060] When the thickness of the sewing fabric is smaller or the fabric density is smaller, the thread feed resistance will decrease. At this time, the thread feed resistance at the thread feed end of the needle should be increased, that is, the curvature of the folding line should be increased. At this time, the traction force of the thread take-up rod 7 can be distributed less to the thread loop, so that the thread loop obtains a smaller tightening force, and then the thread loop obtains a preset tightening degree, avoiding the thread loop from being too tight, and ensuring the sewing quality.

[0061] When sewing is finished, when the sewing thread of the needle is cut to form a thread end, the driving component 1 drives the dynamic line component to move, increasing the curvature of the folding line channel at a time, that is, increasing the thread capacity of the folding line channel. Since the thread feeding resistance of the thread clamp 6 is constant and the stroke of the thread take-up rod 7 is constant, the thread feeding amount is constant, and the thread storage amount in the folding line channel increases, resulting in an increase in the return thread amount, that is, driving the thread end to be withdrawn, avoiding the thread end from being exposed, and ensuring the sewing quality.

[0062] In some embodiments, the moving direction of the moving line component is perpendicular to the line connecting the adjacent wire holes on both sides thereof;

[0063] and / or,

[0064] The moving direction of the dynamic line component is consistent with the strip length direction of its inner strip wire hole.

[0065] The moving direction of the dynamic line component is made perpendicular to the line connecting the adjacent wire holes. By changing the displacement of the dynamic line component, the curvature and wire capacity of the broken line can be changed, thereby changing the wire entry resistance.

[0066] The movement direction of the moving line component is consistent with the length direction of the strip wire hole, so that when the moving line component moves, the sewing thread can move radially in the strip wire hole until it abuts against one end of the strip wire hole. The sewing thread then moves radially synchronously with the moving line component to fit the fold line path.

[0067] The length direction of the first strip-shaped wire hole 22 is the same as the feeding direction of the wire blocking assembly 2, and the length extension direction of the second strip-shaped wire hole 31 is the same as the rotation direction of the wire picking assembly 3.

[0068] In some embodiments, the moving line assembly includes a line blocking assembly 2 , and the line blocking assembly 2 includes a first strip-shaped line passing hole 22 . The length direction of the first strip-shaped line passing hole 22 is consistent with the movement direction of the line blocking assembly 2 .

[0069] like Figure 1 and Figure 2 As shown, the movement direction of the driving component 1 driving the dynamic detection component is perpendicular to the line connecting its two adjacent wire passing holes, such as the movement direction of the wire blocking component 2 is perpendicular to the line connecting the second wire passing hole 42 and the third wire passing hole 43, and the movement trajectory of the wire blocking component 2 is a straight line. As the displacement of the wire blocking component 2 increases, the curvature of the broken line path composed of the first strip wire passing hole 22 and the second wire passing hole 42 and the third wire passing hole 43 inside it increases, and the wire capacity increases, and the generated wire entry resistance increases.

[0070] When the line blocking assembly 2 and the mounting seat 4 are transformed from a straight line path to a folded line path, the driving assembly 1 drives the line blocking assembly 2 to move in a straight line according to a preset trajectory. During the process, the sewing thread and the first strip wire hole 22 move relative to each other along the length direction of the strip wire hole until the sewing thread abuts against the end of the first strip wire hole 22. At this time, the sewing thread moves with the line blocking assembly 2, the curvature of the folded line path increases, and the line feed resistance increases.

[0071] In some embodiments, the wire blocking assembly 2 is fixedly connected to the telescopic head 11 of the driving assembly 1 through an adjusting screw 21. The adjusting screw 21 can pass through any position of the first strip wire hole 22 and then be fixedly connected to the telescopic head 11, and is used to adjust the maximum wire capacity of the folded line channel composed of the first strip wire hole 22 and the adjacent wire holes on both sides thereof.

[0072] like Figure 1 、 Figure 2 and Figure 5As shown, different fabrics have different resistances, that is, the thread feed resistance required at the needle end during sewing is also different. Therefore, by changing the thread feed resistance of the folded line channel formed by the thread blocking assembly 2, the thread feed resistance at the needle end can be changed. The process is to adjust the relative position relationship between the first strip thread hole 22 and the line connecting the second thread hole 42 and the third thread hole 43 during sewing, and change the curvature of the folded line channel.

[0073] Therefore, an adjusting screw 21 is set in the first strip-shaped wire hole 22. When adjusting, it is only necessary to loosen the adjusting screw 21 and change the relative position relationship between the wire blocking assembly 2 and the telescopic head 11, so that the driving assembly 1 can provide different feed resistances when the stroke is the same, so as to adapt to the sewing of fabrics with different feed resistances.

[0074] In some embodiments, the moving thread assembly includes a thread take-up assembly 3, which is mounted to rotate relative to the mounting base 4, and the driving assembly 1 is connected to the thread take-up assembly 3 for driving the thread take-up assembly 3 to rotate.

[0075] like Figure 1 、 Figure 2 and Figure 6 As shown, the movement direction of the thread taking-up component 3 is perpendicular to the line connecting the first thread passing hole 41 and the second thread passing hole 42, and the thread taking-up component 3 is in rotational motion. As the rotation angle of the thread taking-up component 3 increases, the curvature of the broken line path formed by the second strip thread passing hole 31 and the first thread passing hole 41 and the second thread passing hole 42 inside it increases, and the thread capacity increases, and the thread feeding resistance generated increases.

[0076] When the thread picking assembly 3 and the mounting seat 4 are transformed from a straight line path to a folded line path, the driving assembly 1 drives the thread picking assembly 3 to rotate according to the preset axis trajectory. During the process, the sewing thread and the second strip thread hole 31 move relative to each other along the length direction of the strip thread hole until the sewing thread abuts against the end of the second strip thread hole 31. At this time, the sewing thread moves with the thread picking assembly 3, the curvature of the folded line path increases, and the line feed resistance increases.

[0077] In some embodiments, the thread take-up assembly 3 includes a second linear thread passing hole 31 . The second linear thread passing hole 31 is an arc-shaped hole, and the arc center overlaps with the rotation axis of the thread take-up assembly 3 .

[0078] like Figure 3 and Figure 4As shown, the second strip wire hole 31 is an arc-shaped hole, and the center of the arc overlaps with the axis of rotation of the thread picking assembly 3. At this time, when the sewing thread and the second strip wire hole 31 move relative to each other along the length direction of the strip wire hole, the relative movement of the sewing thread and the second strip wire hole 31 is positively correlated with the rotation amount of the thread picking assembly 3, that is, the sewing thread can move unimpeded in the second strip wire hole 31 to the end of the second strip wire hole 31, and will not be stuck in the middle position of the second strip wire hole 31, thereby ensuring that the curvature, wire capacity and wire feed resistance of the broken line channel composed of the thread picking assembly 3 and the mounting seat 4 are stable.

[0079] In some embodiments, the thread take-up assembly 3 further includes a first strip-shaped limiting hole 32 and a coaxially rotatable rocker 5;

[0080] The first strip-shaped limiting hole 32 is an arc-shaped hole, and the arc center overlaps with the rotation axis of the thread take-up assembly 3;

[0081] One end of the rocker arm 5 is dynamically connected to the telescopic head 11 of the driving assembly 1, and the other end is provided with a pin shaft slidably installed in the first strip-shaped limiting hole 32. When the telescopic head 11 drives the rocker arm 5 to swing, the pin shaft moves to the end of the first strip-shaped limiting hole 32, driving the thread taking-up assembly 3 and the rocker arm 5 to rotate synchronously.

[0082] like Figure 4 and Figure 5 As shown, when there are two or more moving line components, a motion virtual position is set between at least one moving line component and the driving component 1, that is, the moving line component and the driving component 1 can only be driven to move synchronously after the driving component 1 moves a preset stroke.

[0083] like Figure 4 and Figure 5 As shown, a motion virtual position is set between the thread take-up component 3 and the driving component 1. When the driving component 1 moves a preset stroke, the thread take-up component 3 is driven to move synchronously with the driving component 1.

[0084] The first rotating shaft hole 33 of the thread take-up assembly 3 and the second rotating shaft hole 52 of the rocker arm 5 share the same rotating shaft and are rotatably mounted on the mounting base 4, that is, the thread take-up assembly 3 and the rocker arm 5 are coaxially rotatably mounted on the mounting base 4, and the driving assembly 1 drives the thread take-up assembly 3 to rotate through the rocker arm 5.

[0085] And because the first strip limiting hole 32 is provided in the thread take-up component 3, the pin hole 51 is provided at the end of the swing arm 5, and the pin shaft vertically fixed in the pin hole 51 is slidably installed in the first strip limiting hole 32, when the driving component 1 drives the swing arm 5 to swing, there is a certain movement virtual position between the swing arm 5 and the thread take-up component 3. When the driving component 1 drives multiple moving line components at the same time, it can give priority to driving the other moving line components to move. After a preset time, the pin shaft at the end of the swing arm 5 moves to the end of the first strip limiting hole 32, and then drives the thread take-up component 3 to rotate, thereby adjusting the line path composed of the thread take-up component 3 and the mounting seat 4, that is, the line path change of the thread take-up component 3 is later than the line path change of other moving line components;

[0086] If the moving line assembly includes both the thread take-up assembly 3 and the thread blocking assembly 2, when the driving assembly 1 moves, the thread path of the thread blocking assembly 2 changes first, and the thread path of the thread take-up assembly 3 changes later;

[0087] If the thread picking component 3 is set on the upstream side of the thread blocking component 2, during sewing, the thread blocking component 2 is a folded line path, and the thread picking component 3 is a straight line path. The folded line path of the thread blocking component 2 is used to change the thread feed resistance to adapt to the sewing of the corresponding fabric. When sewing is completed, the thread blocking component 2 is preferentially changed to a straight line path or the bending degree is reduced, and then the thread picking component 3 is changed to a folded line path to increase the thread capacity and draw back the thread end. Since the bending degree in the thread blocking component 2 is reduced at this time, the resistance passing through the thread blocking component 2 is reduced, that is, the resistance when the thread end is withdrawn is reduced, thereby ensuring that the thread end can be smoothly retracted.

[0088] In some embodiments, the telescopic head 11 is hinged to the end of the rocker 5;

[0089] Alternatively, a second strip-shaped limiting hole 53 is provided at the end of the rocker arm 5, and a pin shaft fixed vertically to the telescopic head 11 is slidably provided in the second strip-shaped limiting hole 53. When the telescopic head 11 moves, the pin shaft is driven to slide in the second strip-shaped limiting hole 53, thereby driving the rocker arm 5 to rotate.

[0090] like Figure 3 As shown, the driving component 1 is preferably a cylinder, and its telescopic head 11 can move linearly. Through the cooperation of the pin shaft vertically arranged on the telescopic head 11 and the second strip-shaped limiting hole 53, the linear motion of the telescopic head 11 is converted into the swing of the rocker arm 5, and the swing angle of the rocker arm 5 can be limited by setting the length of the second strip-shaped limiting hole 53.

[0091] In some embodiments, there are two moving line components, and the maximum wire capacity of the strip-shaped wire holes and the broken line channel composed of the wire holes of the two moving line components is different;

[0092] The driving assembly 1 has at least one travel point, so that only the strip-shaped wire-passing hole of one of the moving line assemblies and the adjacent wire-passing holes on both sides thereof form a broken line path.

[0093] like Figure 1 and Figure 2 As shown, the dynamic line component includes a line blocking component 2 and a line picking component 3, and the line capacity of the folded line channel formed by the line picking component 3 and the mounting seat 4 is greater than the line capacity of the folded line channel formed by the line blocking component 2 and the mounting seat 4. When sewing, the folded line channel formed by the line blocking component 2 is used to provide line feed resistance, and the folded line channel formed by the line picking component 3 is used to accommodate the retracted sewing thread. Since the line capacity of the folded line channel formed by the line picking component 3 is greater than the line capacity of the folded line channel formed by the line blocking component 2, when the amount of sewing thread stored in the folded line channel formed by the line picking component 3 is greater than the amount of sewing thread released by the straight line channel formed by the line blocking component 2, it can drive the sewing thread to be retracted, that is, the thread end is pulled back.

[0094] The driving assembly 1 has at least one travel point, so that only one of the strip-shaped thread-passing holes and the thread-passing hole forms a folded line path, that is, the other is a straight line path. For example, at this travel point, the thread-taking assembly 3 forms a folded line path, and the thread-blocking assembly 2 forms a straight line path, that is, the thread-end withdrawal action is completed by moving the driving assembly 1 to this travel point.

[0095] At another stroke point, the thread take-up assembly 3 forms a straight line path, and the thread blocking assembly 2 forms a broken line path. At this time, the thread blocking assembly 2 provides resistance for the thread feed, that is, it meets the thread feed resistance requirements during sewing.

[0096] That is, the driving component 1 only needs two travel points. Therefore, the driving component 1 can select a driving device with two fixed travel points, such as a cylinder, to simplify the control program.

[0097] In addition to the sewing machine thread-passing adjustment mechanism disclosed in the above embodiments, the present invention further provides a sewing machine including the above sewing machine thread-passing adjustment mechanism, comprising a thread clamp 6, a thread take-up lever 7 and any one of the above sewing machine thread-passing adjustment mechanisms;

[0098] The thread clamp 6 is arranged on the upstream side of the thread adjustment mechanism of the sewing machine to provide a constant thread feeding resistance;

[0099] The thread take-up lever 7 is arranged on the downstream side of the thread-passing regulating mechanism of the sewing machine and is used to provide thread feeding power.

[0100] The sewing thread passes through the thread clamp 6, the first thread hole 41, the second strip thread hole 31, the second thread hole 42, the first strip thread hole 22, and the third thread hole 43 in sequence, and then enters the fourth thread hole 71 of the thread take-up lever 7, and then enters the thread hole of the needle. Through the coordinated work of the thread clamp 6, the thread take-up lever 7 and the sewing machine thread adjustment mechanism, the feed resistance of the sewing thread is guaranteed to be stable, the tightening force of the thread loop formed by the needle is guaranteed to meet the preset standard, and the cut thread end can be pulled back to ensure the sewing quality.

[0101] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0102] The above is a detailed introduction to the thread-passing adjustment mechanism for a sewing machine and the sewing machine provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A thread-adjusting mechanism for a sewing machine, characterized in that: include: A mounting seat (4) provided with at least two wire holes; At least one moving line component, which is provided with strip-shaped wire holes, and the strip-shaped wire holes are arranged alternately with the wire holes; A driving component (1) is used to drive the moving line component to move or stop, so that the strip-shaped wire hole and the wire holes adjacent to it on both sides form a broken line path or a straight line path.

2. The thread-passing adjustment mechanism for a sewing machine according to claim 1, characterized in that: The movement direction of the dynamic line component is perpendicular to the line connecting the adjacent wire holes on both sides thereof; and / or, The movement direction of the dynamic line component is consistent with the strip length direction of the strip-shaped wire hole therein.

3. The thread-passing adjustment mechanism for a sewing machine according to claim 1, characterized in that: The moving line assembly comprises a line blocking assembly (2), the line blocking assembly (2) comprises a first strip-shaped line passing hole (22), and the length direction of the first strip-shaped line passing hole (22) is consistent with the moving direction of the line blocking assembly (2).

4. The thread-passing adjustment mechanism for a sewing machine according to claim 3, characterized in that: The wire blocking assembly (2) is fixedly connected to the telescopic head (11) of the driving assembly (1) via an adjusting screw (21). The adjusting screw (21) can pass through any position of the first strip-shaped wire hole (22) and then be fixedly connected to the telescopic head (11) for adjusting the maximum wire capacity of the broken wire channel formed by the first strip-shaped wire hole (22) and the adjacent wire holes on both sides thereof.

5. The thread-passing adjustment mechanism for a sewing machine according to claim 1, characterized in that: The moving line assembly includes a thread take-up assembly (3), the thread take-up assembly (3) is mounted to rotate relative to the mounting seat (4), and the driving assembly (1) is connected to the thread take-up assembly (3) by power and is used to drive the thread take-up assembly (3) to rotate.

6. The thread-passing adjustment mechanism for a sewing machine according to claim 5, characterized in that: The thread taking-up assembly (3) comprises a second strip-shaped thread passing hole (31), wherein the second strip-shaped thread passing hole (31) is an arc-shaped hole, and the arc center overlaps with the rotation axis of the thread taking-up assembly (3).

7. The thread-passing adjustment mechanism for a sewing machine according to claim 5, characterized in that: The thread taking-up assembly (3) further includes a first strip-shaped limiting hole (32) and a coaxially rotatable rocker (5); The first strip-shaped limiting hole (32) is an arc-shaped hole, and the arc center overlaps with the rotation axis of the thread picking assembly (3); One end of the rocker arm (5) is connected to the telescopic head (11) of the driving assembly (1) through a power connection, and the other end is provided with a pin shaft slidably mounted in the first strip-shaped limiting hole (32). When the telescopic head (11) drives the rocker arm (5) to swing, the pin shaft moves to the end of the first strip-shaped limiting hole (32), thereby driving the thread-taking assembly (3) and the rocker arm (5) to rotate synchronously.

8. The thread-passing adjustment mechanism for a sewing machine according to claim 7, characterized in that: The telescopic head (11) is hinged to the end of the rocker (5); Alternatively, a second strip-shaped limiting hole (53) is provided at the end of the swing rod (5), and a pin shaft fixed vertically to the telescopic head (11) is slidably provided in the second strip-shaped limiting hole (53). When the telescopic head (11) moves, the pin shaft is driven to slide in the second strip-shaped limiting hole (53), thereby driving the swing rod (5) to rotate.

9. The thread-passing adjustment mechanism for a sewing machine according to any one of claims 1 to 8, characterized in that: There are two moving line components, and the maximum wire capacity of the strip-shaped wire holes and the broken line channel formed by the wire holes of the two moving line components is different; The driving component (1) has at least one travel point, so that only the strip-shaped wire-passing hole of one of the moving line components and the wire-passing holes adjacent to it on both sides form a broken line path.

10. A sewing machine, characterized in that: It comprises a thread clamp (6), a thread take-up lever (7) and a thread-passing adjustment mechanism for a sewing machine according to any one of claims 1 to 9; The thread clamp (6) is arranged on the upstream side of the thread-passing adjustment mechanism of the sewing machine and is used to provide a constant thread-feeding resistance; The thread take-up lever (7) is arranged on the downstream side of the thread-passing regulating mechanism of the sewing machine and is used to provide thread feeding power.

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