Yarn trapper of embroidery machine

Abstract

The utility model belongs to the technical field of embroidery machines, in particular relates to a thread trapper of an embroidery machine, and solves the problem that a baffle reed cannot be conveniently controlled to a uniform angle. The thread trapper of the embroidery machine comprises a bottom plate, at least one screw is arranged on the bottom plate, a nut is in threaded connection with the outer end of the screw, a thread passing wheel located between the nut and the bottom plate is rotationally connected to the screw, a thread take-up spring is further arranged on the screw, and the thread passing wheel is in threaded connection with the thread take-up spring. The thread take-up spring has the elastic trend that the radial section of the thread take-up spring is attached to the radial abutting face of the baffle spring piece, the baffle spring piece is arranged on the screw in a sleeving mode, the first limiting part of the baffle spring piece is inserted into the first limiting holes of the bottom plate to be rotationally limited, and at least two first limiting holes are distributed in the circumferential direction with the screw as the circle center. And the take-up spring and the baffle spring sheet are connected in a detection circuit. The effects that the angles of the baffle reeds can be conveniently adjusted, and the baffle reeds can be conveniently unified to the same angle position are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to embroidery machine technical field, especially relate to a thread clamp of embroidery machine. BACKGROUND

[0002] Embroidery machine is a kind of mechanical equipment specially used for carrying out automatic or semi-automatic embroidery work on fabric. It can accurately embroider complex patterns, characters or images on materials such as cloth and leather according to pre-designed patterns and color schemes. Embroidery machine is widely used in clothing manufacturing, home decoration, gift making and other fields, adding beauty and personalization to products.

[0003] The thread clamp of embroidery machine is used for clamping the yarn on the yarn guide that exits weaving, preventing it from falling off the yarn guide, and guiding the thread at the same time. Most thread clamps are basically provided with a thread guide wheel, a thread tension spring and a stop spring piece that cooperate with each other, for adjusting the thread tension and monitoring whether the thread tension is abnormal in real time, to ensure the stability of the thread.

[0004] When the tension is adjusted, the angle of the stop spring piece that is pulled to rotate will also change. At this time, the stop spring piece needs to be adaptively adjusted in rotation. However, in some prior art, the fixation of the stop spring piece is achieved by a bolt provided with an arc-shaped slot. The angle of the stop spring piece is adjusted by changing the relative position of the bolt in the arc-shaped slot. This scheme is inconvenient for flexible adjustment on the one hand, and on the other hand, the specific fixed position cannot be defined, making it difficult to uniformly arrange the stop spring pieces at the corresponding positions. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned problems existing in the prior art and provides a thread clamp of embroidery machine.

[0006] In order to achieve the purpose of the utility model, the following technical solutions can be used:

[0007] A thread clamp of embroidery machine, comprising a bottom plate, at least one screw rod is arranged on the bottom plate, a nut is screwed on the outer end of the screw rod, a thread guide wheel is rotatably connected to the screw rod between the nut and the bottom plate, a thread tension spring is further arranged on the screw rod, the thread tension spring has an elastic tendency that its radial segment is attached to the radial abutting surface of the stop spring piece, the stop spring piece is sleeved on the screw rod, and a first limiting portion of the stop spring piece is inserted into a first limiting hole in the bottom plate for rotational limiting, the first limiting hole is distributed in at least two around the screw rod as the center, and the thread tension spring and the stop spring piece are connected to a detection circuit.

[0008] The utility model discloses a thread clamp suitable for embroidery machine, which is mainly used for realizing stable control and tension adjustment of embroidery thread. The screw nut is located at the outer end of the screw rod, and the rotation resistance of the thread wheel is fixed or adjusted by cooperation with the screw rod. The thread wheel is rotationally connected to the screw rod and located between the screw nut and the bottom plate. The thread wheel guides the embroidery thread and adjusts the rotation resistance of the thread wheel to control the tension of the thread. The thread tension spring is installed on the screw rod and has a certain elasticity. The thread passes through the thread tension spring, which can maintain appropriate thread tension. The spring stopper is sleeved on the screw rod and cooperates with the thread tension spring to limit the maximum rebound angle of the thread tension spring. The first limiting part is inserted into the first limiting hole of the bottom plate to realize limiting fixation. The fixation has flexible detachability. The first limiting hole is provided with multiple first limiting holes, so that the radial abutting surface of the spring stopper can be at multiple angle positions to limit the maximum rotation position of the thread tension spring and facilitate setting the spring stoppers at a uniform angle. The detection circuit detects whether the thread is broken or the tension is too low. In the normal state, the thread tension spring is pulled away from the radial abutting surface by the thread. When the thread is cut or the tension is too low, the thread tension spring contacts the radial abutting surface under the elastic force of the torsion spring, and the thread tension spring and the spring stopper are electrically connected. The detection circuit can realize corresponding detection. The thread clamp can effectively ensure smooth transmission and stable tension of the thread during embroidery, which is of great significance to improving embroidery quality. The detection circuit is a common knowledge and is not described in detail.

[0009] In the thread clamp of the embroidery machine, the spring stopper includes an annular plate body, the annular plate body is provided with an axially protruding first limiting part extending radially on the outer periphery, and the first limiting part is formed with the radial abutting surface on one side. The screw rod passes through the center hole of the annular plate body.

[0010] The annular plate body is the main structural part of the spring stopper, which has a center hole for passing the screw rod and can rotate around the screw rod. The first limiting part extends radially from the outer periphery of the annular plate body and protrudes in the axial direction. The component is inserted into the first limiting hole to position and limit the rotation of the spring stopper. Since the first limiting part extends radially outward, it can be observed from the axial direction of the screw rod, which is convenient for determining the current setting angle of the spring stopper.

[0011] As an optimization, a radial extending knob is arranged on the outer side of the annular plate body, which is convenient for the operator to axially operate.

[0012] In the thread clamp of the embroidery machine, the bottom plate is provided with a plurality of first limiting holes distributed circumferentially around the screw rod. The first limiting part is inserted into the first limiting hole. The first limiting hole extends radially and is at least partially located radially outside the annular plate body.

[0013] The first limiting hole is provided with multiple, which guarantees multiple positioning angles of the first limiting part, the first limiting hole is strip-shaped, and the extending direction is perpendicular to the rotating direction of the first limiting part, which guarantees good and stable limiting effect, and the first limiting hole is partially or entirely located outside the orthographic projection of the annular plate body, which is adapted to the extending direction of the first limiting part.

[0014] In the thread tensioner of the embroidery machine, the bottom plate is provided with an arc-shaped boss, the annular plate body is attached to the top surface of the arc-shaped boss, the arc-shaped boss is provided with an arc-shaped notch at the upper end, and the radial segment of the thread lifting spring is arranged through the arc-shaped notch; a plurality of second limiting holes are circumferentially distributed on the arc-shaped boss, the annular plate body is provided with a second limiting part protruding axially, and the second limiting part is axially inserted into the second limiting hole.

[0015] The arc-shaped boss protrudes on the plate surface of the bottom plate and is used for abutting against the annular plate body. Of course, the arc of the arc-shaped boss is greater than 180 degrees, which guarantees stable abutting and supporting. The upper end of the torsion spring segment of the thread lifting spring is located inside the arc-shaped boss, the arc-shaped notch is used for the radial segment of the thread lifting spring to pass through, and the outer side of the arc-shaped boss is further provided with a second limiting hole. The outer side of the stop spring sheet is provided with a corresponding second limiting part, the second limiting part is connected with one of the second limiting holes, has flexible detachability, and the spacing of the second limiting hole is adapted to the spacing of the first limiting hole.

[0016] As an optimization, a limiting table is arranged on the radial outer side of the arc-shaped boss, and the second limiting hole is arranged on the limiting table.

[0017] In the thread tensioner of the embroidery machine, the thread lifting spring comprises a torsion spring segment, a radial segment and a U-shaped thread lifting segment which are integrally connected, the torsion spring segment is sleeved on the screw rod, the bottom is rotationally limited to the screw rod through the axial bending segment, the radial segment is circumferentially rotatably arranged through the arc-shaped notch, the outer end has an elastic tendency of rotating against the radial abutting surface, and the thread lifting segment is located on the radial outer side of the thread guide wheel; the stop spring sheet is rotationally connected to the screw rod through the insulating ring.

[0018] The lower part of the thread lifting spring is the torsion spring segment, which is used for providing elastic force for the rotation of the radial segment. The radial segment is used for connecting the torsion spring segment and the thread lifting segment. The thread lifting segment is U-shaped, the inner arc surface of which is used for guiding the passing of the face thread. The insulating ring is used for realizing the insulation between the stop spring sheet and the screw rod, and guaranteeing the detection purpose of the detection circuit.

[0019] Further, the lower end of the screw rod is provided with a radial protruding annular boss, the annular boss is sleeved with the torsion spring segment, the bottom surface of the annular boss is provided with an axially extending torsion spring mounting hole slot, and the axial bending segment is inserted into the torsion spring mounting hole slot.

[0020] In the thread tensioner of the embroidery machine, the elastic compression assembly is arranged between the nut and the thread guide wheel, and the elastic compression assembly comprises a compression spring, the compression spring is sleeved on the screw rod, the upper end of the compression spring abuts against the inner top surface of the nut, and the lower end of the compression spring abuts against the top surface of the thread guide wheel through a spring seat.

[0021] The elastic compression assembly is used for applying axial compression to the thread guide wheel, thereby increasing the rotational resistance to achieve the effect of controlling the thread tension, the nut is engaged on the screw rod, and the compression amount of the compression spring is adjusted through screwing in or screwing out, so that the compression of the thread guide wheel is controlled, the spring seat is located between the compression spring and the thread guide wheel, and axial compression exists between the bottom surface of the spring seat and the top surface of the thread guide wheel, so that the rotational resistance is formed. Specifically, the compression spring comprises a cylindrical helical spring or a conical helical spring, and the conical helical spring is more preferable and has a larger expansion range.

[0022] In the thread tensioner of the embroidery machine, the nut comprises a cap-shaped body, a threaded hole is arranged through the top surface of the cap-shaped body, the screw rod is engaged and connected with the threaded hole, a dust ring body at the lower end of the cap-shaped body is arranged on the spring seat, and the spring seat has a U-shaped cross section.

[0023] The threaded hole arranged through the cap-shaped body has a larger screwing-in depth on the screw rod, and in addition, the cap-shaped body is arranged on the spring seat through the dust ring body at the lower part, so that the problem of dust falling into the spring seat is avoided.

[0024] In the thread tensioner of the embroidery machine, an axial extension anti-rotation groove is arranged through the upper end of the screw rod in the radial direction, an annular lock washer is sleeved on the screw rod, the bottom surface of the lock washer abuts against the top end of the compression spring, a radially protruding anti-rotation protrusion is arranged in a first connecting hole of the lock washer, the anti-rotation protrusion is inserted into the anti-rotation groove, a first tooth-shaped part is arranged on the upper end surface of the lock washer in the circumferential direction, a second tooth-shaped part is arranged on the inner top surface of the cap-shaped body in the circumferential direction, the first tooth-shaped part and the second tooth-shaped part are matched, the teeth of the first tooth-shaped part and the second tooth-shaped part are triangular, a radially extending anti-rotation horizontal strip is arranged in a second connecting hole of the spring seat, the screw rod passes through the second connecting hole, and the anti-rotation horizontal strip is slidingly connected in the anti-rotation groove.

[0025] The anti-rotation groove is axially formed at the upper end of the screw rod, the anti-rotation convex body of the lock washer is inserted into the anti-rotation groove and is axially liftable but not rotatable on the screw rod, of course, the anti-rotation convex body can also be in the form of a horizontal strip connecting two sides, the nut is abutted by the lock washer and the compression spring, the first and second toothed portions are provided between the lock washer and the nut, under the action of the compression spring, the first and second toothed portions are in the meshing and close contact state, avoiding the self-rotation of the nut due to running vibration and the like, however, the tooth body is designed in a triangular shape, so that the relative rotation of the first and second toothed portions can be realized under the application of a large enough external rotating force, ensuring the screwing in and out operation of the nut.

[0026] In the thread clamp of the embroidery machine, annular wool pads are arranged between the spring seat and the thread guide wheel and between the stop spring sheet and the thread guide wheel, an insulation ring with an L-shaped cross section is arranged between the stop spring sheet and the screw rod, and a circumferential inside of a top end of the arc-shaped convex platform is provided with a step for giving way to the insulation ring.

[0027] The annular wool pads avoid the direct contact between the stop spring sheet and the thread guide wheel, preventing wear, and the insulation ring is used to cut off the guiding connection between the stop spring sheet and the screw rod, thereby realizing the insulation between the stop spring sheet and the thread tension spring, the cross section of the insulation ring is L-shaped, the small-diameter section is inserted into the stop spring sheet, and the large-diameter end is located at the lower end of the stop spring sheet and is axially positioned.

[0028] In the thread clamp of the embroidery machine, annular wool pads are arranged between the spring seat and the thread guide wheel and between the stop spring sheet and the thread guide wheel, an insulation ring with an L-shaped cross section is arranged between the stop spring sheet and the screw rod, and a circumferential inside of a top end of the arc-shaped convex platform is provided with a step for giving way to the insulation ring.

[0029] The bottom plate is further provided with a strip-shaped warning light connected with the control panel and a toggle switch, the strip-shaped warning light is located between the thread clamp nut assembly and the break detection wheel assembly, and the toggle switch is located at the side of the strip-shaped warning light.

[0030] The face thread passes through the thread clamp nut assembly, the break detection wheel assembly, the thread guide wheel, the transition thread sleeve and the thread outlet thread sleeve in sequence, realizing the thread guiding and tension control, the thread clamp nut assembly, the break detection wheel assembly, the transition thread sleeve and the thread outlet thread sleeve are disclosed in the patent CN115233386B and are not expanded here. The strip-shaped warning light extends horizontally, facilitating observation, and the toggle switch is located at the side, facilitating operation without affecting normal thread guiding.

[0031] Compared with the prior art, the utility model mainly has the following advantages:

[0032] 1. The stop spring sheet cooperates with the threader spring, and is used for limiting the maximum rebound angle of the threader spring, a first limiting part of the stop spring sheet is inserted into a first limiting hole of a bottom plate, the fixing has flexible detachability, and a plurality of first limiting holes are arranged, so that a radial abutting surface of the stop spring sheet can be at a plurality of angular positions, and it is also beneficial to arrange the stop spring sheets of each group at a uniform angle; and a detection circuit is used for detecting whether the thread is broken or the tension is too low, so as to effectively ensure smooth transmission and stable tension of the thread in the embroidery process.

[0033] 2. The first limiting hole is in a strip shape, and an extension direction of the first limiting hole is perpendicular to a rotating direction of the first limiting part, so that a good and stable limiting effect is ensured, and the first limiting hole is partially or entirely located outside the orthographic projection of the annular plate body, which is adapted to the extension direction of the first limiting part, so as to facilitate an operator to observe the current arrangement state of the first limiting part.

[0034] 3. The arc-shaped boss protrudes on the plate surface of the bottom plate and is used for abutting against the annular plate body, the upper end of the torsion spring section of the threader spring is located inside the arc-shaped boss, and the arc-shaped notch is used for the radial section of the threader spring to pass through, in order to make the fixing of the stop spring sheet more stable, the outer side of the arc-shaped boss is further provided with a second limiting hole, and the outer side of the threader spring is provided with a corresponding second limiting part.

[0035] 4. The elastic compression assembly is used for applying axial pressure to the thread wheel, so as to increase the rotation resistance and realize the effect of controlling the thread tension.

[0036] 5. The cap-shaped body is arranged on the spring seat through the dust ring body cover at the lower part, so as to avoid the problem of dust falling into the spring seat.

[0037] 6. The screw cap abuts against the compression spring through the lock washer, the first tooth-shaped part and the second tooth-shaped part are arranged between the lock washer and the screw cap, so as to avoid self-rotation of the screw cap due to running vibration and the like, however, the tooth body is designed in a triangular shape, so that relative rotation can be realized under the application of a large enough rotating external force, and the screwing-in and screwing-out operation of the screw cap is ensured.

[0038] 7. The arrangement of the annular wool pad avoids direct contact between the stop spring sheet and the thread wheel, so as to prevent wear, and the insulating ring is used for cutting off the guiding connection between the stop spring sheet and the screw rod, so as to realize insulation between the stop spring sheet and the threader spring. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a schematic diagram of the overall structure provided by the utility model;

[0040] Figure 2 is a schematic diagram of the cross section of the related structure of the thread wheel provided by the utility model;

[0041] Figure 3 is a schematic diagram of the structure inside the screw cap provided by the utility model;

[0042] Figure 4 is the structural schematic view of the bottom plate provided by the utility model, and the setting position of the stop spring sheet and the thread tension spring;

[0043] Figure 5 is the structural schematic view of the screw rod provided by the utility model;

[0044] Figure 6 is the structural schematic view of the thread tension spring provided by the utility model;

[0045] Figure 7 is the structural schematic view of the screw rod provided by the utility model;

[0046] Figure 8 is the structural schematic view of the stop spring sheet provided by the utility model;

[0047] Figure 9 is the structural schematic view of the spring seat provided by the utility model.

[0048] In the figure, the bottom plate 1, the screw rod 2, the screw cap 3, the thread wheel 4, the thread tension spring 5, the stop spring sheet 6, the first limiting part 7, the first limiting hole 8, the radial abutting surface 9, the annular plate body 10, the center hole 11, the arc-shaped boss 12, the arc-shaped notch 13, the second limiting hole 14, the second limiting part 15, the limiting table 16, the torsion spring section 17, the radial section 18, the thread tension section 19, the insulating ring 20, the annular boss 21, the torsion spring mounting hole groove 22, the axial bending section 23, the elastic compression assembly 24, the compression spring 25, the spring seat 26, the cap-shaped body 27, the threaded hole 28, the dustproof ring body 29, the anti-rotation groove 30, the anti-loosening ring 31, the anti-rotation boss 32, the first toothed part 33, the second toothed part 34, the second connecting hole 35, the anti-rotation cross strip 36, the annular wool pad 37, the accommodation step 38, the thread clamping nut assembly 39, the break detection wheel assembly 40, the transition thread sleeve assembly 41, the thread outlet thread sleeve assembly 42, the strip-shaped warning light 43, the toggle switch 44, the toggle part 45, the first connecting hole 46. DETAILED DESCRIPTION

[0049] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0050] The specific embodiment is as follows Figures 1-9As shown, the thread clamp of the embroidery machine comprises a base plate 1, the base plate 1 is provided with nine screw rods 2, the outer end of the screw rod 2 is screwed with a nut 3, the screw rod 2 is rotationally connected with a thread guide wheel 4 between the nut 3 and the base plate 1, the screw rod 2 is further provided with a thread lifting spring 5, the thread lifting spring 5 has an elastic tendency that its radial segment 18 is attached to the radial abutting surface 9 of the stop spring sheet 6, the stop spring sheet 6 is sleeved on the screw rod 2, and its first limiting part 7 is inserted into the first limiting hole 8 of the base plate 1 to rotationally limit, there are five first limiting holes 8 distributed circumferentially around the screw rod 2 as the center, and the thread lifting spring 5 and the stop spring sheet 6 are connected in the detection circuit.

[0051] Specifically, the nut 3 is located at the outer end of the screw rod 2, and the rotation resistance of the thread guide wheel 4 is fixed or adjusted by cooperating with the screw rod 2; the thread guide wheel 4 is rotationally connected on the screw rod 2, and is located between the nut 3 and the base plate 1, which functions to guide the embroidery thread to pass through, and the rotation resistance of the thread guide wheel 4 can be adjusted by rotating the nut 3 to achieve the effect of controlling the tension of the thread; the thread lifting spring 5 is installed on the screw rod 2 and has a certain elasticity, the thread passes through the thread lifting segment 19 of the thread lifting spring 5, and the thread tension can be maintained appropriately; the stop spring sheet 6 is sleeved on the screw rod 2 and cooperates with the thread lifting spring 5 to limit the maximum rebound angle of the thread lifting spring 5, the first limiting part 7 of the stop spring sheet 6 is inserted into the first limiting hole 8 of the base plate 1 to achieve limiting and fixing, the fixing has flexible detachability, and the first limiting hole 8 is provided with multiple, so that the radial abutting surface 9 of the stop spring sheet 6 can be at multiple angular positions, the maximum rotational position of the thread lifting segment 19 of the thread lifting spring 5 is limited, and it is also conducive to setting each group of stop spring sheets 6 at a uniform angle; the detection circuit is used for detecting whether the thread is broken or the tension is too low, in the normal state, the thread lifting segment 19 is pulled away from the radial abutting surface 9 by the thread, and when the thread is cut or the tension is too small, the thread lifting segment 19 loses enough pulling force and is in contact with the radial abutting surface 9 under the action of the elastic force of the torsional spring segment 17, that is, the thread lifting spring 5 and the stop spring sheet 6 are conductively connected, and the detection circuit can achieve the corresponding detection purpose. The thread clamp can effectively ensure the smooth transmission and stable tension of the thread in the embroidery process, which is of great significance to improve the embroidery quality.

[0052] As shown in Figure 3 , 4 , 8, the stop spring sheet 6 comprises an annular plate body 10, the annular plate body 10 is provided with an axially protruding first limiting part 7 extending radially on the outer periphery, one side of the first limiting part 7 is formed with a radial abutting surface 9, and the screw rod 2 passes through the center hole 11 of the annular plate body 10. There are five first limiting holes 8 distributed circumferentially around the screw rod 2 as the center on the base plate 1, the first limiting part 7 is inserted into the first limiting hole 8, the first limiting hole 8 extends radially, and part of it is located radially outside the annular plate body 10.

[0053] Specifically, the annular plate body 10 is the main structural part of the stop spring piece 6, which has a central hole 11 for penetrating the screw rod 2 and can rotate around the screw rod 2. The first limiting part 7 extends radially from the outer periphery of the annular plate body 10 and protrudes in the axial direction. This part is inserted into the first limiting hole 8 to position and limit the rotation of the stop spring piece 6. Since it extends radially outward, it can be observed even from the axial direction of the screw rod 2, which facilitates the determination of the current setting angle of the stop spring piece 6. The first limiting hole 8 is provided with five, which ensures multiple positioning angles of the first limiting part 7. The first limiting hole 8 is strip-shaped and extends in a direction perpendicular to the rotation direction of the first limiting part 7, which ensures good and stable limiting effect. The first limiting hole 8 is partially located outside the orthographic projection of the annular plate body 10, which is adapted to the extension direction of the first limiting part 7.

[0054] As shown in Figure 4 , 8 , the bottom plate 1 is provided with an arc-shaped boss 12, and the annular plate body 10 is attached to the top surface of the arc-shaped boss 12. The upper end of the arc-shaped boss 12 is provided with an arc-shaped notch 13, and the radial segment 18 of the thread lifting spring 5 penetrates the arc-shaped notch 13. The radial outer side of the arc-shaped boss 12 is provided with a limiting platform 16, and the limiting platform 16 is provided with a second limiting hole 14. The annular plate body 10 is provided with a second limiting part 15 protruding in the axial direction, and the second limiting part 15 is inserted into the second limiting hole 14 in the axial direction.

[0055] Specifically, the arc-shaped boss 12 protrudes on the surface of the bottom plate 1 and is used to abut against the annular plate body 10. Of course, the arc of the arc-shaped boss 12 is greater than 180 degrees, which ensures stable abutment and support. The upper end of the torsion spring segment 17 of the thread lifting spring 5 is located inside the arc-shaped boss 12, and the arc-shaped notch 13 is used for the radial segment 18 of the thread lifting spring 5 to penetrate. In order to make the fixation of the stop spring piece 6 more stable, the outer side of the arc-shaped boss 12 is also provided with a second limiting hole 14, and the outer side of the stop spring piece 6 is provided with a corresponding second limiting part 15. The second limiting part 15 is connected with one of the second limiting holes 14 and has flexible detachability. The spacing of the second limiting hole 14 is adapted to the spacing of the first limiting hole 8.

[0056] As shown in Figure 2 , 6 , the thread lifting spring 5 includes an integrally connected torsion spring segment 17, radial segment 18 and U-shaped thread lifting segment 19. The torsion spring segment 17 is sleeved on the screw rod 2 and the bottom is rotationally limited with the screw rod 2 through the axial bending segment 23. The radial segment 18 penetrates the arc-shaped notch 13 in a circumferential direction and has an elastic tendency to rotate against the radial abutting surface 9 at the outer end. The thread lifting segment 19 is located radially outside the thread guide wheel 4. The stop spring piece 6 is rotationally connected with the screw rod 2 through the insulating ring 20. The lower end of the screw rod 2 is provided with a radially protruding annular boss 21. The annular boss 21 is sleeved with the torsion spring segment 17. The bottom surface of the annular boss 21 is provided with an axially extending torsion spring mounting hole slot 22, and the axial bending segment 23 is inserted into the torsion spring mounting hole slot 22.

[0057] Specifically, the lower part of the thread tension spring 5 is a torsion spring segment 17, which is used to provide the elastic force for the rotation of a radial segment 18, which is used to connect the torsion spring segment 17 and a thread tension segment 19, which is U-shaped, and the inner arc surface of which is used to guide the passing of the thread, and the insulating ring 20 is used to realize the insulation between the stop spring piece 6 and the screw rod 2, so as to ensure the detection purpose of the detection circuit.

[0058] As shown in Figure 2 , 3 , 7, the elastic compression assembly 24 is arranged between the nut 3 and the thread guide wheel 4, and the elastic compression assembly 24 comprises a compression spring 25, which is sleeved on the screw rod 2, and the upper end of the compression spring 25 is in abutment with the inner top surface of the nut 3, and the lower end of the compression spring 25 is in abutment with the top surface of the thread guide wheel 4 through a spring seat 26. The nut 3 comprises a cap-shaped body 27, and a threaded hole 28 is arranged through the top surface of the cap-shaped body 27, and the screw rod 2 is connected in meshing with the threaded hole 28, and a dust ring body 29 at the lower end of the cap-shaped body 27 is arranged on the spring seat 26, and the spring seat 26 is U-shaped in cross section.

[0059] Specifically, the elastic compression assembly 24 is used to apply axial pressure to the thread guide wheel 4, so as to increase the rotation resistance and realize the effect of controlling the thread tension, the nut 3 is meshed with the screw rod 2, and the compression amount of the compression spring 25 is adjusted by the operation of screwing in or screwing out, so as to control the pressure of the thread guide wheel 4, and the spring seat 26 is located between the compression spring 25 and the thread guide wheel 4, and there is axial pressure between the bottom surface of the spring seat 26 and the top surface of the thread guide wheel 4, so as to form rotation resistance. Specifically, the compression spring 25 is a conical coil spring, which has a larger expansion range. The threaded hole 28 on the cap-shaped body 27 is arranged through, so that the screwing depth on the screw rod 2 is larger, and in addition, the cap-shaped body 27 is arranged on the spring seat 26 through the dust ring body 29 at the lower part, so as to avoid the problem of dust falling into the spring seat 26.

[0060] As shown in Figure 2 , 3 , 5, an axially extending anti-rotation groove 30 is arranged through the upper end of the screw rod 2 in the radial direction, an annular anti-loosening ring 31 is sleeved on the screw rod 2, the bottom surface of the anti-loosening ring 31 is in abutment with the top end of the compression spring 25, a radially protruding anti-rotation protrusion 32 is arranged in a first connecting hole 46 of the anti-loosening ring 31, and the anti-rotation protrusion 32 is inserted into the anti-rotation groove 30; a circumferentially distributed first toothed portion 33 is arranged on the upper end surface of the anti-loosening ring 31, a circumferentially distributed second toothed portion 34 is arranged on the inner top surface of the cap-shaped body 27, the first toothed portion 33 and the second toothed portion 34 are matched, and the teeth of the first toothed portion 33 and the second toothed portion 34 are triangular; a radially extending anti-rotation horizontal strip 36 is arranged in a second connecting hole 35 of the spring seat 26, the screw rod 2 passes through the second connecting hole 35, and the anti-rotation horizontal strip 36 is slidingly connected in the anti-rotation groove 30.

[0061] Specifically, the anti-rotation groove 30 is axially formed from the upper end of the screw rod 2, the anti-rotation convex body 32 of the anti-loosening ring 31 is inserted into the anti-rotation groove 30, and is axially liftable but not rotatable on the screw rod 2, the nut 3 is in abutment with the compression spring 25 through the anti-loosening ring 31, the first toothed portion 33 and the second toothed portion 34 are provided between the anti-loosening ring 31 and the nut 3, and under the action of the compression spring 25, the first toothed portion 33 and the second toothed portion 34 are in a meshing and close-fitting state, thereby avoiding self-rotation of the nut 3 due to running vibration and the like. However, the tooth body is designed in a triangular shape, so that relative rotation of the first toothed portion 33 and the second toothed portion 34 can be realized under the application of a large enough external rotating force, thereby ensuring the screwing-in and screwing-out operation of the nut 3.

[0062] As an optimization, an annular wool pad 37 is provided between the spring seat 26 and the thread passing wheel 4, and between the stop spring piece 6 and the thread passing wheel 4, an insulation ring 20 in an L-shaped cross section is provided between the stop spring piece 6 and the screw rod 2, and a circumferential inside of a top end of the arc-shaped boss 12 is provided with a clearance step 38 adapted to the insulation ring 20.

[0063] Specifically, the provision of the annular wool pad 37 avoids direct contact between the stop spring piece 6 and the thread passing wheel 4, thereby preventing wear, and the insulation ring 20 is used to cut off the guiding connection between the stop spring piece 6 and the screw rod 2, thereby realizing insulation between the stop spring piece 6 and the thread tension spring 5. The cross section of the insulation ring 20 is in an L shape, a small diameter section of which is inserted into the stop spring piece 6, and a large diameter end side is located at a lower end of the stop spring piece 6 for axial installation and positioning.

[0064] In the embodiment, the bottom plate 1 is further provided with 9 groups of thread clamping nut assemblies 39, thread breaking and detecting wheel assemblies 40, transition thread passing kits 41 and thread exiting thread passing kits 42 in sequence, the thread passing wheel 4 is located between the thread breaking and detecting wheel assembly 40 and the thread exiting thread passing kit 42, the thread passing wheel 4 is also provided with 9 groups, and is arranged in two rows with the upper five and the lower four being staggered, and the transition thread passing kit 41 is arranged between the two rows of thread passing wheels 4; the bottom plate 1 is further provided with a strip-shaped warning light 43 connected with a control panel and a toggle switch 44, the strip-shaped warning light 43 is located between the thread clamping nut assembly 39 and the thread breaking and detecting wheel assembly 40, and the toggle switch 44 is located at a side of the strip-shaped warning light 43. The strip-shaped warning light 43 extends horizontally, which is convenient for observation, and the toggle switch 44 is located at the side, which is convenient for operation without affecting normal thread passing.

[0065] Specific working principle: the face thread passes through the thread clamping nut assembly 39 and the break detection wheel assembly 40 in turn, when the upper row of thread passing wheels 4 needs to be set, the face thread first passes around the thread passing wheel 4, and then passes out from the thread lifting section 19, and then passes through the transition thread passing sleeve 41 to pass out from the thread outlet thread passing sleeve 42, when the row of thread passing wheels 4 needs to be set, it is first passed through the transition thread passing sleeve 41, and then passed through the thread passing wheel 4, the thread lifting section 19 and the thread outlet thread passing sleeve 42 in turn, to complete the setting of the face thread. When the thread tension needs to be adjusted, the nut can be appropriately screwed in or out for control, at this time the stable position of the thread lifting section 19 changes after being pulled, the operator can adjust the stop spring piece 6 to the corresponding angle by means of the knob 45, and the thread lifting section 19 is pulled. When the face thread is disconnected, the thread lifting section 19 loses the pull and is attached to the stop spring piece 6, at this time the strip-shaped warning lamp 43 is turned on to make a sign, realizing the thread break detection.

[0066] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A thread clamp for an embroidery machine, comprising a base plate (1), wherein at least one screw (2) is provided on the base plate (1), a nut (3) is screwed to the outer end of the screw (2), and a thread guide wheel (4) located between the nut (3) and the base plate (1) is rotatably connected to the screw (2), characterized in that, The screw (2) is also provided with a thread-taking spring (5), which has an elastic tendency to make its radial section (18) fit against the radial abutment surface (9) of the retaining spring (6). The first limiting part (7) of the retaining spring (6) is inserted into the first limiting hole (8) of the base plate (1) for rotational limitation. There are at least two first limiting holes (8) circumferentially distributed around the screw (2). The thread-taking spring (5) and the retaining spring (6) are connected to the detection circuit.

2. The thread clamp of the embroidery machine according to claim 1, characterized in that, The retaining spring (6) includes an annular plate (10), and an axially protruding first limiting part (7) is provided radially extending on the outer periphery of the annular plate (10). A radial abutting surface (9) is formed on one side of the first limiting part (7), and the screw (2) passes through the central hole (11) of the annular plate (10).

3. The thread clamp of the embroidery machine according to claim 2, characterized in that, The base plate (1) has a plurality of first limiting holes (8) distributed circumferentially around the screw (2). The first limiting part (7) is inserted into the first limiting hole (8). The first limiting hole (8) extends radially and is at least partially located on the radial outer side of the annular plate (10).

4. The thread clamp of the embroidery machine according to claim 2, characterized in that, The base plate (1) is provided with an arc-shaped boss (12), the annular plate (10) is in contact with the top surface of the arc-shaped boss (12), the upper end of the arc-shaped boss (12) is provided with an arc-shaped notch (13), and the radial section (18) of the thread-lifting spring (5) passes through the arc-shaped notch (13). The arc-shaped boss (12) has several second limiting holes (14) distributed circumferentially, and the annular plate (10) is provided with an axially protruding second limiting part (15), which is axially inserted into the second limiting hole (14).

5. The thread clamp of the embroidery machine according to claim 4, characterized in that, The thread-taking spring (5) includes an integrally connected torsion spring section (17), radial section (18), and U-shaped thread-taking section (19). The torsion spring section (17) is sleeved on the screw (2), and its bottom is limited to rotation with the screw (2) through an axial bending section (23). The radial section (18) is circumferentially rotatable through an arc-shaped notch (13), and its outer end has an elastic tendency to rotate toward the radial abutment surface (9). The thread-taking section (19) is located on the radial outer side of the thread guide wheel (4). The retaining spring plate (6) is rotatably connected to the screw (2) through an insulating ring (20).

6. The thread clamp of the embroidery machine according to claim 1, characterized in that, An elastic clamping assembly (24) is provided between the nut (3) and the guide wheel (4). The elastic clamping assembly (24) includes a clamping spring (25). The clamping spring (25) is sleeved on the screw (2), and its upper end abuts against the inner top surface of the nut (3), while its lower end abuts against the top surface of the guide wheel (4) through a spring seat (26).

7. The thread clamp of the embroidery machine according to claim 6, characterized in that, The nut (3) includes a cap-shaped body (27), and a threaded hole (28) is provided through the top surface of the cap-shaped body (27). The screw (2) is engaged with the threaded hole (28). The dustproof ring (29) at the lower end of the cap-shaped body (27) is covered on the spring seat (26). The cross-section of the spring seat (26) is U-shaped.

8. The thread clamp of the embroidery machine according to claim 7, characterized in that, The upper end of the screw (2) is provided with an axially extending anti-rotation groove (30) that extends radially through it. The screw (2) is fitted with an annular anti-loosening ring (31). The bottom surface of the anti-loosening ring (31) abuts against the top of the compression spring (25). The first connecting hole (46) of the anti-loosening ring (31) is provided with a radially protruding anti-rotation protrusion (32). The anti-rotation protrusion (32) extends into the anti-rotation groove (30). The upper end face of the anti-loosening ring (31) is provided with a first toothed part (33) distributed in a circumferential direction, and the inner top surface of the cap-shaped body (27) is provided with a second toothed part (34) distributed in a circumferential direction. The first toothed part (33) and the second toothed part (34) match each other, and the teeth of the first toothed part (33) and the second toothed part (34) are triangular. The spring seat (26) has a radially extending anti-rotation crossbar (36) in the second connecting hole (35), the screw (2) passes through the second connecting hole (35), and the anti-rotation crossbar (36) is slidably connected in the anti-rotation groove (30).

9. The thread clamp of the embroidery machine according to claim 6, characterized in that, An annular pad (37) is provided between the spring seat (26) and the guide wheel (4), and between the retaining spring plate (6) and the guide wheel (4). An insulating ring (20) with an L-shaped cross-section is provided between the retaining spring plate (6) and the screw (2). A clearance step (38) adapted to the insulating ring (20) is provided on the inner side of the top of the arc-shaped boss (12) of the base plate (1).

10. The thread clamp of the embroidery machine according to any one of claims 1-9, characterized in that, The base plate (1) is also provided with a wire clamping nut assembly (39), a breakage detection wheel assembly (40), a transition wire guide kit (41), and an outgoing wire guide kit (42) in sequence. The wire guide wheel (4) is located between the breakage detection wheel assembly (40) and the outgoing wire guide kit (42), and the transition wire guide kit (41) is located between the two rows of wire guide wheels (4). The base plate (1) is also provided with a strip warning light (43) and a toggle switch (44) connected to the control panel. The strip warning light (43) is located between the wire clamp nut assembly (39) and the breakage detection wheel assembly (40), and the toggle switch (44) is located to the side of the strip warning light (43).

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