Upper thread quantity adjusting mechanism

Abstract

The utility model discloses an upper thread quantity adjusting mechanism, and relates to the technical field of bar tacking machines. The thickness sensor is used for detecting the thickness of the cloth pressed by the presser foot; a thread pushing rod is arranged on the side, deviating from the machine shell, of the thread passing arc plate, and a first thread penetrating hole is formed in the end of the thread pushing rod; and the counter-recoil device is connected with the wire passing arc plate. According to the upper thread quantity adjusting mechanism, the technical problems that an existing upper thread quantity adjusting mechanism of the bar tacking machine excessively depends on the understanding conditions of lathe workers on fabrics with different thicknesses, accurate adjustment is difficult to make even never adjustment in the actual working condition, and the thread breakage rate is extremely high are solved, the thickness sensor detects the thickness of the fabric after the fabric is pressed by the presser foot, and the adjustment accuracy is improved. The required thread quantity of the upper threads is calculated, so that the extending distance of the thread pushing rod is adjusted to be matched with the movement of the thread take-up lever, the thread take-up quantity of the thread take-up lever is adjusted, the thread supply quantity and the thread consumption quantity during fabric sewing are kept consistent as much as possible, and the thread breakage rate of the bar tacking machine in the sewing process is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a knotter technical field, especially a face thread quantity adjusting mechanism. BACKGROUND

[0002] The thickness change of the fabric will affect the relationship between the supply (collection) thread quantity and the shuttle required thread quantity, and a difference value appears between the two, which will cause the face thread to be tight or loose. The tight face thread will increase the thread breakage rate of the sewing machine, and the loose face thread will cause poor sewing effect. This conclusion is not only applicable to the knotter, but also applicable to the keyhole machine, the flat bed sewing machine and other sewing machines.

[0003] The existing face thread quantity adjusting mechanism of the knotter mainly relies on adjusting the left and right positions of the thread passing hook to change the face thread quantity. This method relies too much on the understanding of different thick fabrics by the operator, and it is difficult to make accurate adjustment or even no adjustment in actual working conditions, resulting in a high thread breakage rate. Therefore, a face thread quantity adjusting mechanism is proposed to solve the above problems. SUMMARY

[0004] The utility model aims at providing a face thread quantity adjusting mechanism, which solves the technical problem that the existing face thread quantity adjusting mechanism of the knotter relies too much on the understanding of different thick fabrics by the operator, and it is difficult to make accurate adjustment or even no adjustment in actual working conditions, resulting in a high thread breakage rate.

[0005] To achieve the above-mentioned purpose, the utility model provides a face thread quantity adjusting mechanism, which comprises:

[0006] A machine shell;

[0007] A thickness sensor arranged on the bottom surface of the machine shell for detecting the thickness of the fabric after being pressed by the presser foot;

[0008] A thread passing arc plate arranged on the side surface of the machine shell, wherein one side of the thread passing arc plate away from the machine shell is provided with a thread pushing rod, and the end portion of the thread pushing rod is provided with a first thread passing hole for passing the face thread;

[0009] A reciprocating device arranged in the interior of the machine shell, wherein the reciprocating device is connected with the thread passing arc plate, and is used for driving the thread passing arc plate and the thread pushing rod to reciprocate in the direction perpendicular to the outer wall of the machine shell.

[0010] Preferably, the reciprocating device comprises a guide rod arranged on the side surface of the machine shell, a slide rod connecting seat slidingly connected with the guide rod, a guide driving column connected with the side surface of the slide rod connecting seat, a linear bearing connected with the guide driving column, and the linear bearing penetrates through the machine shell and is connected with the thread passing arc plate.

[0011] Preferably, the side of the casing is provided with a driving device, the output end of the driving device is connected with a driving connecting rod, the driving connecting rod is connected with a driving slide rod, and the driving slide rod is in transmission connection with the slide rod connecting seat.

[0012] Preferably, the side of the slide rod connecting seat is rotatably connected with a rotating connecting column, one end of the rotating connecting column away from the linear bearing is provided with a first clamping plate, and the first clamping plate is in sliding connection with the driving slide rod.

[0013] Preferably, the side of the slide rod connecting seat close to the linear bearing is provided with a limiting block, and the limiting block is rotatably connected with one end of the rotating connecting column close to the linear bearing.

[0014] Preferably, the side of the slide rod connecting seat is provided with a guide hole penetrating through, the guide hole is matched with the guide rod, the outer circumferential side of the guide rod is provided with a plurality of guide protrusions extending along the guide rod axis direction, the inner circumferential side of the guide hole is provided with a plurality of guide grooves, the guide hole is in sliding connection with the guide rod, and each guide protrusion is in sliding connection with one guide groove.

[0015] Preferably, the side of the casing is provided with a guide sleeve, and the guide sleeve is in sliding connection with the linear bearing.

[0016] Preferably, the side of the casing is provided with a limiting guide plate, the limiting guide plate is in sliding connection with the wire passing arc plate, and the bottom surface of the limiting guide plate is attached to the top surface of the wire passing arc plate.

[0017] Preferably, the side of the casing is provided with a main thread clamping device, the main thread clamping device is internally provided with a face thread, the upper side of the main thread clamping device is provided with a guide torsion spring, and the guide torsion spring is used for penetrating the face thread.

[0018] Preferably, the top surface of the limiting guide plate is provided with a second thread penetrating hole and a third thread penetrating hole, and the second thread penetrating hole and the third thread penetrating hole are both used for penetrating the face thread.

[0019] With respect to the above background art, the face thread amount adjusting mechanism has the following beneficial effects: the thickness sensor detects the thickness of the cloth after being pressed by the presser foot, the required face thread amount is calculated according to the thickness of the cloth after being pressed by the presser foot, the wire passing arc plate is driven by the repeating device to reciprocate in the direction perpendicular to the outer wall of the casing, the position of the thread pushing rod relative to the casing is adjusted to cooperate with the movement of the thread picking rod, the thread picking amount of the thread picking rod is accurately adjusted, the thread supply amount is kept consistent with the thread consumption amount as much as possible during the sewing of the fabric, and the thread breakage rate of the looping machine during the sewing process is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0021] Figure 1 A perspective view of the thread amount adjusting mechanism according to an embodiment of the present application is provided.

[0022] Figure 2 A plan view of the thread amount adjusting mechanism according to an embodiment of the present application is provided.

[0023] Figure 3 A perspective view of the rewinding device according to an embodiment of the present application is provided.

[0024] Figure 4 A perspective view of the rewinding device according to an embodiment of the present application is provided.

[0025] Specifically, 1 - a casing; 2 - a wire passing arc plate; 3 - a wire pushing rod; 301 - a first wire passing hole; 4 - a fixed block; 5 - a rewinding device; 501 - a rotating connecting column; 502 - a sliding rod connecting seat; 503 - a needle roller bearing; 504 - a limiting block; 505 - a guide driving column; 506 - a linear bearing; 507 - a guide rod; 508 - a guide protrusion; 509 - a plastic bearing; 6 - a driving device; 7 - a driving connecting rod; 8 - a driving sliding rod; 9 - a thread lifting lever; 10 - a first clamping plate; 11 - a second clamping plate; 12 - a guide torsion spring; 13 - a guide sleeve; 14 - a limiting guide plate; 15 - a main thread clamp; 16 - a second wire passing hole; 17 - a third wire passing hole. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments only represent some embodiments of the present application, and for those skilled in the art, all other embodiments obtained without creative labor on the basis of the provided drawings also belong to the scope of protection of the present application.

[0027] In order to make those skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] As Figure 1 and Figure 2To achieve the above object, the utility model provides a surface thread line quantity adjusting mechanism, which comprises: and the retraction device 5 arranged on the casing 1.

[0029] Among them, the side of casing 1 is provided with the line passing arc plate 2, the side of line passing arc plate 2 away from casing 1 is provided with the thread pushing rod 3, the end of thread pushing rod 3 is provided with the first thread passing hole 301 for passing surface thread, after surface thread passes the first thread passing hole 301, surface thread is threaded on the thread lifting lever 9.

[0030] Need to explain, the thread lifting lever 9 is arranged on the casing 1, and the thread lifting lever 9 is connected with the sewing needle through the connecting rod mechanism, the up-down movement of the sewing needle controls the up-down swing of the thread lifting lever 9, therefore, the up-down swing stroke of the thread lifting lever 9 is fixed, and the thread lifting lever 9 picks out the fixed amount of surface thread in the up-down swing process to meet the required surface thread in the sewing process, and the related structure of the thread lifting lever 9 is the relatively mature prior art, so it will not be described in detail.

[0031] The bottom of casing 1 is provided with the thickness sensor (not shown in the figure), and the thickness sensor can accurately detect the thickness of the cloth pressed by the presser foot. The inside of casing 1 is provided with the retraction device 5, and the retraction device 5 is connected with the line passing arc plate 2; according to the thickness of the cloth pressed by the presser foot detected by the thickness sensor, the retraction device 5 drives the line passing arc plate 2 and the thread pushing rod 3 to reciprocate a certain distance along the direction perpendicular to the outer wall of casing 1, so as to drive the thread pushing rod 3 to extend a certain distance relative to casing 1, the distance of the thread pushing rod 3 is controlled to cooperate with the movement of the thread lifting lever 9, the thread lifting amount of the thread lifting lever 9 is changed, the thread supply amount of the thread lifting lever 9 is kept consistent with the thread consumption amount as much as possible during the sewing of the fabric, and the thread breakage rate of the looping machine during the sewing process is reduced.

[0032] When using, in the initial state, the standard thickness of the fabric is set, the thickness of the cloth pressed by the presser foot is detected according to the standard thickness of the fabric as the reference, when the thread lifting lever 9 moves downward, the shuttle hooks the surface thread, the retraction device 5 drives the line passing arc plate 2 and the thread pushing rod 3 to extend a certain distance relative to casing 1, when the thread loop is separated from the inside of the shuttle, the thread lifting lever 9 moves upward, all the sewing thread is taut, the retraction device 5 drives the line passing arc plate 2 and the thread pushing rod 3 to retract to the initial position, the thread lifting lever 9 picks out the surface thread, the distance of the thread pushing rod 3 is controlled to cooperate with the movement of the thread lifting lever 9, the surface thread line quantity picked out by the thread lifting lever 9 is adjusted, the surface thread line quantity picked out by the thread lifting lever 9 is kept consistent with the required surface thread line quantity during the sewing of the fabric, so as to reduce the thread breakage rate of the looping machine during the sewing process.

[0033] It should be noted that when the shuttle is hooked to the face thread, the main shaft rotation angle is 220°, at this time, the thread tensioning lever 9 is in a downward movement state, and the repeat feed device 5 starts to drive the thread passing arc plate 2 and the thread pushing lever 3 to move away from the outer wall of the machine shell 1. When the thread ring is out of the shuttle, the main shaft rotation angle is 336°, at this time, the thread tensioning lever 9 is in an upward movement state, and all the sewing threads are tensioned, so before the main shaft rotation angle is 336°, the repeat feed device 5 starts to drive the thread passing arc plate 2 and the thread pushing lever 3 to retract to the initial position, so as to ensure that the thread tensioning lever 9 accurately picks out the face thread.

[0034] In addition, through test analysis, the sewing effect of the looping machine is best for medium-thick materials, and the thickness of the eight-layer woven fabric with the best test effect can be used as the standard thickness.

[0035] In an embodiment of the utility model, the repeat feed device 5 includes: a guide rod 507 arranged on the side of the machine shell 1, the guide rod 507 is slidably connected with a slide rod connecting seat 502, the side of the slide rod connecting seat 502 is connected with a guide driving column 505, the guide driving column 505 is connected with a linear bearing 506, specifically, the end of the guide driving column 505 is provided with a second clamping plate 11, the second clamping plate 11 is fixedly connected with one end of the linear bearing 506 in the machine shell 1, the linear bearing 506 penetrates through the machine shell 1 and is connected with the thread passing arc plate 2, the slide rod connecting seat 502 can reciprocate on the guide rod 507 along the axial direction of the guide rod 507, drive the guide driving column 505 to move synchronously, the linear bearing 506 moves synchronously with the guide driving column 505, thereby driving the thread passing arc plate 2 and the thread pushing lever 3 to extend and retract relative to the machine shell 1.

[0036] It should be noted that the two ends of the guide rod 507 are provided with fixed blocks 4, the fixed blocks 4 are fixed on the side of the machine shell 1 through bolts, and the two fixed blocks 4 are consistent in height, so as to ensure that the axial direction of the guide rod 507 is consistent with the movement direction of the linear bearing 506.

[0037] In an embodiment of the utility model, a motor mounting plate is arranged on the side of the machine shell 1, a driving device 6 is arranged on the motor mounting plate, the driving device 6 and the thickness sensor are connected with the control system, preferably, the driving device 6 is a stepping motor, the stepping motor can rotate by a fixed angle in a specified direction under the control of the control system, the output end of the driving device 6 is connected with a driving connecting rod 7, the driving connecting rod 7 is connected with a driving slide rod 8, the driving slide rod 8 is drivingly connected with the slide rod connecting seat 502, when the control system controls the driving device 6 to drive the driving connecting rod 7 to rotate forward by a certain angle, the driving connecting rod 7 drives the driving slide rod 8 to push the slide rod connecting seat 502 to move by a certain distance along the guide rod 507, when the control system controls the driving device 6 to drive the driving connecting rod 7 to rotate reversely by a certain angle, the driving connecting rod 7 drives the driving slide rod 8 to pull the slide rod connecting seat 502 to move by a certain distance along the guide rod 507.

[0038] It should be noted that the side of the slide rod connecting seat 502 is rotatably connected with the rotating connecting column 501, specifically, the side of the slide rod connecting seat 502 is provided with a mounting hole, a needle bearing 503 is arranged in the mounting hole, the needle bearing 503 is sleeved with the end of the rotating connecting column 501 away from the linear bearing 506, the needle bearing 503 is used for reducing the friction between the mounting hole and the rotating connecting column 501, so as to improve the service life of the slide rod connecting seat, the end of the rotating connecting column 501 away from the linear bearing 506 is provided with the first clamping plate 10, the first clamping plate 10 is slidably connected with the driving slide rod 8, when the driving slide rod 8 moves relative to the guide rod 507, it is ensured that the driving slide rod 8 can be stably connected with the driving slide rod 8 at all times, and it is ensured that the driving slide rod 8 normally drives the slide rod connecting seat 502 to move.

[0039] Preferably, the side of the slide rod connecting seat 502 close to the linear bearing 506 is provided with a limiting block 504, the limiting block 504 is rotatably connected with the end of the rotating connecting column 501 close to the linear bearing 506, specifically, a stepped groove is arranged on the side of the slide rod connecting seat 502 close to the linear bearing 506, the top surface of the stepped groove is provided with the limiting block 504, the upper end of the limiting block 504 is provided with an assembly hole, the assembly hole is rotatably connected with the end of the rotating connecting column 501 close to the linear bearing 506, thereby enhancing the stability of the rotating connecting column 501 when rotating. In addition, a plastic bearing 509 is arranged in the assembly hole, the plastic bearing 509 is used for reducing the friction between the assembly hole and the rotating connecting column 501, so as to further improve the service life of the slide rod connecting seat.

[0040] In an embodiment of the utility model, the side of the slide rod connecting seat 502 is provided with a guide hole, the slide rod connecting seat 502 can stably move on the guide rod 507 through the cooperation of the guide hole and the guide rod 507. Preferably, a plurality of guide protrusions 508 are arranged on the outer circumferential side of the guide rod 507, the guide protrusions 508 extend along the axis direction of the guide rod 507, a plurality of guide grooves are arranged on the inner circumferential side of the guide hole, the guide hole is slidably connected with the guide rod 507, each guide protrusion 508 is slidably connected with a guide groove, the cooperation of the guide protrusions 508 and the guide grooves can prevent the slide rod connecting seat 502 from rotating relative to the guide rod 507, thereby correcting the position state of the slide rod connecting seat 502 when moving, further improving the stability of the whole action of the retraction device 5, and ensuring that the movement position of the pusher rod 3 relative to the casing 1 can be accurately controlled, and then the picking amount of the picking rod 9 can be accurately adjusted.

[0041] Preferably, the side of the casing 1 is provided with a guide sleeve 13, the guide sleeve 13 is slidably connected with the linear bearing 506, the guide sleeve 13 can reduce the friction between the casing 1 and the linear bearing 506, so that the linear bearing 506 can flexibly move relative to the casing 1 under the driving of the rotating driving column, so as to accurately control the movement position of the pusher rod 3 relative to the casing 1.

[0042] In one embodiment of the utility model, the side of the casing 1 is equipped with the main thread clamp 15, the main thread clamp 15 is equipped with the surface thread, the surface thread is fixed in the main thread clamp 15, is used to provide the surface thread in the sewing process, the upper portion of main thread clamp 15 is provided with the guide torsion spring 12, the guide torsion spring 12 is used to wear the surface thread, the guide torsion spring 12 mainly plays the role of changing the surface thread wiring direction.

[0043] The side of casing 1 is equipped with the limiting guide plate 14, the limiting guide plate 14 is slidably connected with the thread passing arc plate 2, specifically, the bottom surface of limiting guide plate 14 is arc-shaped, the top surface of thread passing arc plate 2 is also arc-shaped, and the bottom surface of limiting guide plate 14 is attached to the top surface of thread passing arc plate 2, the movement path of thread passing arc plate 2 can be corrected by limiting guide plate 14. On the other hand, the second thread passing hole 16 and the third thread passing hole 17 are provided on the top surface of limiting guide plate 14, the second thread passing hole 16 and the third thread passing hole 17 are used to pass the surface thread, specifically, after the surface thread is drawn out from the main thread clamp 15, it passes through the guide torsion spring 12, the second thread passing hole 16, the first thread passing hole 301 and the third thread passing hole 17 in turn, then passes through the thread passing hole on the thread tension lever 9, and finally reaches the needle hole of the sewing needle. The arrangement of the guide torsion spring 12, the second thread passing hole 16 and the third thread passing hole 17 can ensure that the thread ends do not deviate and displace during the sewing process, so that the thread ends do not entangle with each other.

[0044] When the utility model is used, the standard thickness of the fabric is taken as the reference, the thickness sensor detects the thickness of the fabric after being pressed by the presser foot during the sewing process, and the thread is hooked by the shuttle when the thread tension lever 9 moves downward according to the thickness of the fabric after being pressed by the presser foot detected by the thickness sensor. The control system controls the driving device 6 to drive the driving connecting rod 7 to rotate forward by a certain angle, the driving connecting rod 7 drives the driving slide rod 8 to push the slide rod connecting seat 502 to move a certain distance along the guide rod 507, the slide rod connecting seat 502 drives the guide driving column 505 to hold the linear bearing 506 to move, the linear bearing 506 holds the thread passing arc plate 2 and the thread pushing rod 3 to extend a certain distance from the casing 1, when the thread loop is detached from the inside of the shuttle, the thread tension lever 9 moves upward, all the sewing threads are tensioned, the overlock device 5 drives the thread passing arc plate 2 and the thread pushing rod 3 to retract to the initial position, and the thread tension lever 9 pulls out the surface thread.

[0045] In summary, the thickness of the fabric after being pressed by the presser foot is detected by the thickness sensor, the required amount of surface thread is calculated, the stepping motor is rotated by a certain angle, the position of the thread pushing rod 3 relative to the casing 1 is adjusted, the extension distance of the thread pushing rod 3 is controlled to match the movement of the thread tension lever 9, the thread pulling amount of the thread tension lever 9 is accurately adjusted, the thread supply amount is consistent with the thread consumption amount as much as possible during the sewing of the fabric, and the thread breakage rate of the overlock machine during the sewing process is effectively reduced.

[0046] It should be noted that the relative terms, such as first and second, are used herein solely to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between such entities.

[0047] The principles and implementation modes of the present application are described herein by using specific examples. The above example is only used to help understand the method and core idea of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A thread tension adjusting mechanism characterized by comprising: The utility model relates to a sewing machine, which comprises a machine shell, a thickness sensor arranged on the bottom surface of the machine shell for detecting the thickness of cloth after being pressed by a presser foot, a thread passing arc plate arranged on the side surface of the machine shell, the thread passing arc plate being provided with a thread pushing rod on the side away from the machine shell, the end of the thread pushing rod being provided with a first thread passing hole for passing a surface thread, a reciprocating device arranged inside the machine shell, the reciprocating device being connected to the thread passing arc plate for driving the thread passing arc plate and the thread pushing rod to reciprocate in a direction perpendicular to the outer wall of the machine shell. The reciprocating device comprises a guide rod arranged on the side surface of the machine shell, the guide rod being slidingly connected to a slide rod connecting seat, the side surface of the slide rod connecting seat being connected to a guide driving column, the guide driving column being connected to a linear bearing, the linear bearing penetrating through the machine shell and being connected to the thread passing arc plate. The side surface of the machine shell is provided with a driving device, the output end of the driving device being connected to a driving connecting rod, the driving connecting rod being connected to a driving slide rod, the driving slide rod being drivingly connected to the slide rod connecting seat. The side surface of the slide rod connecting seat is rotatably connected to a rotating connecting column, the end of the rotating connecting column away from the linear bearing being provided with a first clamping plate, the first clamping plate being slidingly connected to the driving slide rod. The side of the slide rod connecting seat close to the linear bearing is provided with a limiting block, the limiting block being rotatably connected to the end of the rotating connecting column close to the linear bearing.

2. A thread tension adjusting mechanism according to claim 1, wherein The side surface of the slide rod connecting seat is provided with a guide hole penetrating through, the guide hole being matched with the guide rod, the outer circumferential side surface of the guide rod being provided with a plurality of guide protrusions extending along the axis direction of the guide rod, the inner circumferential side surface of the guide hole being provided with a plurality of guide grooves, the guide hole being slidingly connected to the guide rod, each guide protrusion being slidingly connected to a guide groove.

3. A thread tension adjusting mechanism according to claim 2, wherein The side surface of the machine shell is provided with a guide sleeve, the guide sleeve being slidingly connected to the linear bearing.

4. A thread tension adjusting mechanism according to claim 3, wherein The side surface of the machine shell is provided with a limiting guide plate, the limiting guide plate being slidingly connected to the thread passing arc plate, and the bottom surface of the limiting guide plate being attached to the top surface of the thread passing arc plate.

5. A thread tension adjusting mechanism according to claim 4, wherein The side surface of the machine shell is provided with a main thread clamp, the main thread clamp being provided with a surface thread, the upper portion of the main thread clamp being provided with a guide torsion spring for passing the surface thread.

6. A thread tension adjusting mechanism according to claim 2, wherein The top surface of the limiting guide plate is provided with a second thread passing hole and a third thread passing hole, the second thread passing hole and the third thread passing hole being used for passing the surface thread.

7. A thread tension adjusting mechanism according to claim 2, wherein ​ 8. A thread tension adjusting mechanism according to any one of claims 1 to 7, wherein ​ 9. A thread tension adjusting mechanism according to claim 8, wherein ​ 10. A thread tension adjusting mechanism according to claim 9, wherein ​

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