Sewing device without bird nest thread ball and sewing equipment

Abstract

The utility model discloses a sewing device and sewing equipment without a nest thread ball. The sewing device comprises a moving part, a threading part and an extruding part, the threading part at least comprises a threading hole, and the threading hole is used for threading an upper thread; the moving part comprises at least one sliding pair and is used for driving the extrusion part to fix the upper thread and driving the threading part to drag the upper thread, so that the upper thread retracts from a sewing position; after the moving part drives the extrusion part to move to the thread pressing station, the moving part drives the threading part or the thread hooking part to drag the upper thread to move to the thread measuring station; the sewing equipment is a sewing device applying the nesting-free thread ball and comprises a sewing main machine.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing auxiliary equipment of sewing equipment, and particularly relates to a sewing device without a bird's nest thread ball and a sewing equipment. Background Art

[0002] Bird's nesting occurs when the bobbin thread and upper thread become entangled at the bottom of the fabric at the beginning of sewing, forming a skein resembling a bird's nest. This phenomenon is common in various sewing processes, including garment processing and home textile manufacturing. Bird's nesting occurs primarily when the upper thread ends at the start of the sewing machine are too long, resulting in the upper thread not being able to intertwine smoothly and evenly with the bobbin thread, but rather becoming chaotically entangled at the beginning of the seam.

[0003] The bird's nest phenomenon not only affects the appearance of sewing products but can also cause a host of other problems. First, the presence of a bird's nest can cause a protrusion of thread on the front of the sewing product, disrupting the overall aesthetic, especially on thin fabrics. Second, when the garment is worn, the bird's nest area comes into direct contact with the skin, potentially causing discomfort. This can even cause friction or stinging, especially when the nest is large or tightly packed. Furthermore, the presence of a bird's nest can affect the strength of sewing threads, leading to loosening and cracking, thereby reducing the lifespan of the sewing product.

[0004] Therefore, in order to effectively avoid or reduce the generation of bird's nests during the sewing process and improve the sewing quality, a sewing device without bird's nest yarn balls is needed. Utility Model Content

[0005] The purpose of the utility model is to provide a sewing device without a bird's nest ball, comprising a moving part, a threading part, and an extruding part;

[0006] The threading portion includes at least one threading hole, which is used for threading the upper thread;

[0007] The moving part includes at least one sliding pair, and the moving part is used to drive the pressing part to fix the upper thread and drive the threading part to drag the upper thread so that the upper thread is retracted from the sewing position;

[0008] After the moving part drives the extrusion part to move to the wire pressing station, the moving part drives the threading part or the thread hooking part to drag the upper thread to the thread measuring station.

[0009] A technical solution provided by this application also has the following technical features:

[0010] Preferably, in one embodiment of the present application, a sliding pair and a reset portion are provided between the threading portion and the extrusion portion, and the reset portion is used to restore the threading portion to a threading state;

[0011] After the threading unit drives the extrusion unit to move to the wire pressing station, the threading unit moves to the wire measuring station.

[0012] Preferably, in one embodiment of the present application, the moving part drives the threading part through a lever.

[0013] Preferably, in one embodiment of the present application, the moving portion includes a lever mechanism, and the moving portion drives one end of the lever to move, so that the other end of the lever drives the threading portion and / or the extrusion portion.

[0014] Preferably, in one embodiment of the present application, the moving part is an electromagnetic attraction driving device, comprising an iron core, an electromagnet mounting plate, a toggle rod, and an electromagnet; when the electromagnet is powered on, the iron core moves closer to or away from the electromagnet;

[0015] One end of the toggle rod is connected to the iron core, and the other end of the toggle rod is connected to the threading rod;

[0016] The threading part includes a threading rod; the extrusion part includes a clamping slider; the reset part includes a spring;

[0017] The iron core drives the threading rod to move through the toggle rod, and the threading rod drives the thread clamping slider to move through the screw pin. A thread clamping screw pin is set at the thread pressing position. The thread clamping slider squeezes the thread clamping screw pin and clamps the upper thread. The threading rod moves to the thread measuring position, and the upper thread retracts from the sewing position.

[0018] Preferably, in one embodiment of the present application, the threading rod is equipped with a wire passing plate.

[0019] Preferably, in one embodiment of the present application, after the thread pressing station presses the surface thread, when the threading part drags the surface thread, the surface thread at the spool is not dragged by the threading rod, and the surface thread at the fabric sewing location is dragged by the threading rod and retracted from the fabric sewing location.

[0020] A sewing device adopts the above-mentioned sewing device without a bird's nest ball and comprises a sewing main machine.

[0021] The beneficial effects of this application are:

[0022] 1. Reduce the bird's nest phenomenon: By optimizing the upper thread length and controlling the thread distribution of the sewing machine at the beginning of sewing, the bird's nest phenomenon at the beginning of sewing is effectively reduced, and the appearance quality of the sewn products is improved;

[0023] 2. Improve sewing efficiency: The structure of the utility model realizes the simultaneous completion of thread clamping and thread drawing, simplifies the operation and improves sewing efficiency;

[0024] 3. Reduce fabric damage and comfort impact: effectively reduce the size of the bird's nest phenomenon, reduce the impact of thread ball bulge and friction on the fabric and the wearer, and improve the comfort and service life of the finished product;

[0025] 4. Stability and precision: By precisely controlling the stroke and movement of the electromagnet, the accuracy of the wire drawing amount is ensured. At the same time, shock-absorbing pads and spring devices are used to buffer and reduce noise, thereby improving the stability of the equipment.

[0026] 5. Strong flexibility: The device can adapt to different sewing needs, can adjust the thread drawing amount according to actual conditions, and is suitable for a variety of sewing processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an exploded view of a sewing device without a bird's nest ball of yarn according to the present invention;

[0028] Figure 2 A three-dimensional diagram of a sewing device without a bird's nest ball of yarn according to the present invention;

[0029] Figure 3 This is a schematic diagram of the thread-passing state of a sewing device without a bird's nest ball before starting the present invention;

[0030] Figure 4 This is a schematic diagram of the upper thread pulling state of a sewing device without a bird's nest ball of thread after startup of the utility model;

[0031] Figure 5 This is a schematic diagram of the installation position of a sewing device without a bird's nest ball of yarn according to the present invention;

[0032] Components in the picture:

[0033] 1. Screw I

[0034] 2. Cover

[0035] 3. Sales

[0036] 4. Iron core

[0037] 5. Electromagnet mounting plate

[0038] 6. Toggle lever

[0039] 7. Set screw

[0040] 8. Torsion spring

[0041] 9. Axis screw Ⅰ

[0042] 10. Axis screw II

[0043] 11. Threading rod

[0044] 12. Wire clamp screw pin

[0045] 13. Countersunk screws

[0046] 14. Wire board

[0047] 15. Shock-absorbing pads

[0048] 16. Mounting bracket

[0049] 17. Screw pin

[0050] 18. Wire clamp slider

[0051] 19. Spring

[0052] 20. Screw II

[0053] 21. Electromagnet. DETAILED DESCRIPTION

[0054] The following is a further detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present application and are not intended to limit the present invention.

[0055] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0057] In addition, in the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0058] like Figure 1-5 , a sewing device without a bird's nest ball, comprising a moving part, a threading part, and an extruding part;

[0059] The threading portion includes at least one threading hole, which is used for threading the upper thread;

[0060] The moving part includes at least one sliding pair, and the moving part is used to drive the pressing part to fix the upper thread and drive the threading part to drag the upper thread so that the upper thread is retracted from the sewing position;

[0061] After the moving part drives the extrusion part to move to the wire pressing station, the moving part drives the threading part or the thread hooking part to drag the upper thread to the thread measuring station;

[0062] This application can use a variety of mechanisms to achieve movement, squeezing, and contact pressing;

[0063] For example, telescopic devices, such as pneumatic, hydraulic, and electric telescopic mechanisms can be used;

[0064] Or the gears, racks, motors and the like form a moving mechanism, and by setting multiple position points, the purpose of squeezing and resisting the pressing line is achieved, and the purpose of continuing to drag the surface line is achieved through an auxiliary line hooking mechanism or a dragging mechanism.

[0065] Specifically, in one embodiment of the present application, a sliding pair and a reset portion are provided between the threading portion and the extrusion portion, and the reset portion is used to restore the threading portion to a threading state;

[0066] After the threading part drives the extrusion part to move to the wire pressing station, the threading part moves to the wire measuring station; the moving part drives the threading part through a lever; the moving part includes a lever mechanism, and the moving part drives one end of the lever to move, so that the other end of the lever drives the threading part and / or the extrusion part.

[0067] Specifically, in one embodiment of the present application, Figure 1-5 A sewing device without a bird's nest ball includes a screw Ⅰ1, a cover 2, a pin 3, an iron core 4, an electromagnet mounting plate 5, a toggle lever 6, a set screw 7, a torsion spring 8, an axial screw Ⅰ9, an axial screw Ⅱ10, a threading rod 11, a thread clamping screw pin 12, a countersunk screw 13, a thread passing plate 14, a shock-absorbing pad 15, a mounting bracket 16, a screw pin 17, a thread clamping slider 18, a spring 19, a screw Ⅱ20, and an electromagnet 21.

[0068] The moving part is an electromagnetic attraction driving device, which includes an iron core 4, an electromagnet mounting plate 5, a toggle rod 6, and an electromagnet 21. When the electromagnet 21 is powered on, the iron core 4 moves closer to or away from the electromagnet 21.

[0069] One end of the toggle rod 6 is connected to the iron core 4, and the other end of the toggle rod 6 is connected to the threading rod 11;

[0070] The threading part includes a threading rod 11; the extrusion part includes a clamping slider 18; the reset part includes a spring 19;

[0071] The iron core 4 drives the threading rod 11 to move through the toggle rod 6, and the threading rod 11 drives the thread clamping slider 18 to move through the screw pin 17. A thread clamping screw pin 12 is provided at the thread pressing station. The thread clamping slider 18 squeezes the thread clamping screw pin 12 and clamps the upper thread. The threading rod 11 moves to the thread measuring station, and the upper thread is retracted from the sewing position; the threading rod 11 is equipped with a thread passing plate 14; after the thread pressing station presses the upper thread, when the threading part drags the upper thread, the upper thread at the spool is not dragged by the threading rod 11, and the upper thread at the fabric sewing position is dragged by the threading rod 11 and retracted from the fabric sewing position.

[0072] Specifically, in one embodiment of the present application, the electromagnet mounting plate 5 is fixedly connected to the mounting bracket 16 by screws II 20, and the electromagnet 21 is fixed to the mounting plate. The electromagnet 21 has an iron core 4 in the middle, and a pin 3 is fixed to the head of the iron core 4; the toggle rod 6 cooperates with the axial screw I 9, and the axial screw I 9 is fixed to the mounting bracket 16. At the same time, a torsion spring 8 is sleeved on the axial screw II 20, and one end of the torsion spring 8 is sleeved on the toggle rod 6, and the other end is fixed to the mounting bracket 16. On the top, the other end of the toggle rod 6 cooperates with the threading rod 11 through the axial screw II 10. Two screw pins 17 are fixed on the threading rod 11. The threading rod 11 slides on the mounting bracket 16, and the wire clamping slider 18 is covered with the screw pin 17. The spring 19 is also squeezed inside the wire clamping slider 18, and one end contacts the screw pin 17. Finally, the wire passing plate 14 is fixed on the mounting bracket 16. At the same time, a shock-absorbing pad 15 is installed at one end of the wire passing plate 14, and the wire clamping screw pin 12 is fixed to the mounting bracket 16;

[0073] When the movement occurs, the electromagnet 21 is energized and attracted, and the iron core 4 starts to move. Since the pin 3 in the iron core 4 cooperates with the long slot at one end of the toggle rod 6, the toggle rod 6 drives the threading rod 11 to rotate, and the other end of the toggle rod 6 drives the threading rod 11 to slide. The screw pin 17 on the threading rod 11 slides to the left and pushes the clamping slider 18 to slide together. When the clamping slider 18 contacts the clamping screw pin 12, the clamping slider 18 stops, but the iron core 4 can continue to move, so the threading rod 11 can continue to move;

[0074] The principle of realizing the small bird's nest of the present invention is as follows: first, the upper thread on the needle is long after thread trimming, which will cause the bird's nest to be too large. Therefore, effectively reducing the length of the upper thread when sewing is started is the key to reducing the bird's nest. Since the bottom upper thread has not yet been interwoven to form a lockstitch when sewing the first stitch, the rotary shuttle does not need such a large amount of thread. When the thread supply is relatively large before the lowest point of the thread take-up rod, the thread loosening device starts to loosen the thread, and then the sewing device without the bird's nest thread ball is started. The small bird's nest structure clamps the upper thread supplied from the thread rack, and then a part of the upper thread in the upper thread clamp is pulled out. Then the thread loosening device is reset, and the upper thread clamp clamps the upper thread. Afterwards, when the thread take-up rod continues to rise, since the thread supply provided by the thread take-up rod has been partially pulled out by the small bird's nest device, the thread take-up rod needs to draw additional thread from other places during the rising process. During the rising process of the thread take-up lever, it pulls the upper thread upward. Since in the first few stitches of sewing, the resistance of the bottom upper thread under the sewing material is not as great as the resistance generated by the upper thread clamp clamping the upper thread, the thread take-up lever will draw the upper thread from the position under the sewing material when it rises. The length of the upper thread under the sewing material will be effectively shortened, thereby reducing the size of the seam bird's nest.

[0075] Specifically, in one embodiment of the present application, the greatest feature of the structure of the present utility model is that the sewing device without a bird's nest ball of thread realizes the two actions of thread clamping and thread drawing, which are driven by one device. First, the electromagnetic attraction can drive the threading rod 11 to move to the left, thereby pulling the surface thread, but just pulling the surface thread is not enough. The amount of surface thread that really needs to be pulled out is the amount of thread at the surface thread clamp. If only the threading rod 11 pulls the surface thread, the amount of thread on the thread rack will be pulled over. Therefore, it is necessary to clamp the surface thread on the thread rack first to prevent the threading rod 11 from pulling this part of the thread. The way the present utility model clamps the surface thread of the thread rack is that a screw pin 17 is fixed on the threading rod 11, and the screw pin 17 moves left and right with the threading rod 11. Then the hollow wire clamping slider 18 is passed through the screw pin 17. The hollow position inside the wire clamping slider 18 is for accommodating the spring 19. The arc surface at the other end of the wire clamping slider 18 is for contacting the wire clamping screw pin 12, so that the surface thread can be stably clamped. When the electromagnet 21 is attracted, due to the force of the spring 19, the wire clamping slider 18 will move with the threading rod 11; then the wire clamping slider 18 contacts the wire clamping screw pin 12, and the movement of the wire clamping slider 18 stops, but the screw pin 17 is still moving with the threading rod 11, so the spring 19 will continue to be compressed, and the spring 19 also exerts a force on the wire clamping slider 18, so that the pressure between the wire clamping slider 18 and the wire clamping screw pin 12 becomes greater and greater, so the surface thread passing between the wire clamping slider 18 and the wire clamping screw pin 12 will only be clamped tighter and tighter. Of course, a short distance after the clamping slider 18 contacts the clamping screw pin 12, the upper thread at this position has been clamped, and the upper thread pulled by the continued movement of the threading rod 11 will only be the amount of thread from the upper thread clamp.

[0076] Specifically, in one embodiment of the present application, Figure 3 As shown, this is before the sewing device without the bird's nest ball is started; Figure 4 As shown, the sewing device without the bird's nest thread ball is started; before starting, the mechanism is equivalent to a thread-passing part and will not affect sewing. After the mechanism is started, the upper thread in the small bird's nest structure is pulled by the threading rod 11, and the thread amount in the structure is greater than the thread amount before the mechanism is started. This part of the thread amount difference will be the amount of upper thread pulled out from under the sewing material when the thread take-up rod rises, thereby reducing the bird's nest; Figure 4 As shown, the stroke of the electromagnet 21 determines the movement distance of the threading rod 11, which also determines the amount of thread withdrawal. The larger the stroke, the greater the amount of thread withdrawal. At the same time, the torsion spring 8 and the spring 19 are relied upon for reset, and a rubber pad is installed at the tail of the threading plate 14, which can play a role in buffering and reducing noise when the threading rod 11 is reset.

[0077] like Figure 5 , a schematic diagram of the installation position of a sewing device without a bird's nest ball of yarn of the present invention; the control problem of the sewing device without a bird's nest ball of yarn of the present application, first of all, the implementation of the control method needs to rely on the existing technology, that is, the electronic thread loosening function, which can be a non-mechanical structure such as a stepping motor or an electromagnet 21;

[0078] The function of thread loosening is to make it easier for the bird's nest device to extract the thread from the upper thread clamp; then the uppermost needle stop position of the thread take-up rod is 0 degrees, and the main shaft rotates 360 degrees as a cycle. The actions of the present invention are all completed within this cycle, which means that the present invention completes the action of extracting a part of the bottom thread under the sewing material within one main shaft cycle. Then this action is no longer limited to the first stitch of sewing, it can start from the second stitch, and if the amount of thread extracted is not enough, it is okay to repeat two or three stitches until the effect of the bird's nest becoming smaller is achieved. Within one cycle, the present invention is controlled as follows: before the main shaft rotates to 200°-230° at the lowest point of the thread take-up rod, the lowest point of the thread take-up rod is 240°, and the thread loosening device starts to loosen the thread;

[0079] The reason for choosing this angle range is that the difference between the amount of thread required by the sewing machine and the amount of thread supplied by the sewing machine is relatively large within this angle range, and the rotary hook does not need a large amount of thread. Therefore, the upper thread on the thread take-up lever in this angle range is relatively loose, which is conducive to the subsequent thread drawing of the sewing device without a bird's nest thread ball. Otherwise, if it is drawn out too early, the upper thread will be directly pulled out from the needle, causing the seam to fall off. If it is drawn out too late, a large amount of thread will be required, and the resistance of the entire thread path will be large, making it difficult to draw out the upper thread.

[0080] After the thread loosening device loosens the thread, the sewing device without bird's nest ball starts, and a part of the upper thread is pulled out from the upper thread clamp. Then the thread loosening device is closed, the upper thread clamp clamps the upper thread again, and the sewing device without bird's nest ball is also closed; then when the thread take-up rod moves from bottom to top, the thread take-up rod naturally pulls out a part of the upper thread from the bottom of the sewing material, and a cycle control is completed.

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A sewing device without bird's nest yarn balls, characterized in that: It includes moving part, threading part and extrusion part; The threading portion includes at least one threading hole, which is used for threading the upper thread; The moving part includes at least one sliding pair, and the moving part is used to drive the pressing part to fix the upper thread and drive the threading part to drag the upper thread so that the upper thread is retracted from the sewing position; After the moving part drives the extrusion part to move to the wire pressing station, the moving part drives the threading part or the thread hooking part to drag the upper thread to the thread measuring station.

2. A sewing device without a bird's nest ball as claimed in claim 1, characterized in that: A sliding pair and a reset portion are provided between the threading portion and the extrusion portion. The reset portion is used to restore the threading portion to the threading state. After the threading unit drives the extrusion unit to move to the wire pressing station, the threading unit moves to the wire measuring station.

3. A sewing device without a bird's nest ball as claimed in claim 1, characterized in that: The moving part drives the threading part through the lever.

4. A sewing device without a bird's nest ball as claimed in claim 1, characterized in that: The moving part comprises a lever mechanism, and the moving part drives one end of the lever to move, so that the other end of the lever drives the threading part and / or the extruding part.

5. A sewing device without a bird's nest ball as claimed in claim 1, characterized in that: The moving part is an electromagnetic attraction driving device, comprising an iron core (4), an electromagnet mounting plate (5), a toggle rod (6), and an electromagnet (21); when the electromagnet (21) is powered on, the iron core (4) is driven to move closer to the electromagnet (21) or away from the electromagnet (21); One end of the toggle rod (6) is connected to the iron core (4), and the other end of the toggle rod (6) is connected to the threading rod (11); The threading part includes a threading rod (11); the extrusion part includes a thread clamping slider (18); and the reset part includes a spring (19). The iron core (4) drives the threading rod (11) to move through the toggle rod (6), and the threading rod (11) drives the clamping slider (18) to move through the screw pin (17). A clamping screw pin (12) is provided at the thread pressing position. The clamping slider (18) squeezes the clamping screw pin (12) to clamp the upper thread, and the threading rod (11) moves to the thread measuring position, and the upper thread retracts from the sewing position.

6. A sewing device without a bird's nest ball as claimed in claim 5, characterized in that: The threading rod (11) is matched with a wire passing plate (14).

7. A sewing device without a bird's nest ball as claimed in claim 5, characterized in that: After the pressing station presses the upper thread, when the threading part drags the upper thread, the upper thread at the spool is not dragged by the threading rod (11), and the upper thread at the fabric sewing position is dragged by the threading rod (11) and retracted from the fabric sewing position.

8. A sewing device, using the bird's nest-free yarn ball sewing device according to any one of claims 1 to 7, characterized in that: Including sewing machine.

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