thread trimming mechanism

Abstract

The utility model provides a kind of line cutting mechanism belongs to textile technical field.It solves the technical problems such as low reliability of prior art, structural strength reduction etc..The line cutting mechanism, including scissor holder, is equipped with line cutting assembly on scissor holder, and line cutting assembly includes first cutter body and second cutter body connected by cutter body hinge, first guiding limit structure capable of limiting first cutter body only can move along one preset straight line direction is equipped between first cutter body and scissor holder, first guiding slope is equipped on scissor holder, and first guiding slope gradually inclines upwards from inner end to outer end along the moving path of second cutter body, first protrusion matched with first guiding slope is equipped on the lower side of second cutter body, and upper moving clearance is arranged between second cutter body and scissor holder.The utility model has the advantages of strong reliability, compact structure, strong adaptability etc..

Description

Technical Field

[0001] This utility model belongs to the field of textile technology, and in particular relates to a thread-cutting mechanism. Background Technology

[0002] In the field of textile equipment, the thread-cutting mechanism is a common functional module used to automatically cut the yarn during sewing. Traditional thread-cutting mechanisms often use motors or cylinders to directly drive the scissor blades to open and close, resulting in complex structures, large space requirements, and inflexible thread-cutting actions, especially in situations where space is limited or rapid response is required.

[0003] While some existing wire-cutting mechanisms also employ articulated blade structures, they have limitations in terms of drive methods and guidance control. For example, some mechanisms use bidirectional drives or complex linkages to achieve blade closure, which not only results in high manufacturing costs but also low reliability and a tendency to jam or incompletely cut the wire. Alternatively, some mechanisms use grooves in the scissor blades to guide the blade closure, which reduces the structural strength of the blades and consequently affects the overall service life. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a flexible and reliable wire-cutting assembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The wire cutting mechanism includes a scissor frame, on which a wire cutting assembly is provided. The wire cutting assembly includes a first blade and a second blade connected by a blade hinge. A first guide limiting structure is provided between the first blade and the scissor frame to restrict the first blade to move only in a preset straight line direction. A first guide slope is provided on the scissor frame, and the first guide slope gradually slopes upward from the inner end to the outer end along the movement path of the second blade. A first protrusion is provided on the lower side of the second blade to cooperate with the first guide slope. An upward movable gap is provided between the second blade and the scissor frame.

[0006] When the first cutter body moves outward, it simultaneously drives the second cutter body to move horizontally. At this time, through the cooperation of the first protrusion and the inclined surface of the first guide slope, the horizontal movement of the second cutter body is transformed into an oblique movement that forces the second cutter body to lift upward. Simultaneously, due to the constraint of the cutter body hinge, a rotational motion about the hinge relative to the first cutter body is generated. This rotational motion causes the cutting head of the second cutter body to close towards the cutting head of the first cutter body, producing a shearing action. The entire process is continuous and stable, thus achieving a precise shearing effect. Furthermore, due to the complete structure of the cutter body itself, the mechanism has higher reliability and a longer service life.

[0007] In the aforementioned wire-cutting mechanism, the handle of the second blade is disposed within the second blade groove of the scissor holder, and an upward movable gap is provided between the second blade and the scissor holder. The first guide slope is disposed at the bottom of the second blade groove. The first guide slope is disposed at the bottom of the second blade groove so that when the first protrusion slides on the slope surface, the resulting upward thrust can directly act on the second blade, providing a direct and stable guiding effect.

[0008] In the aforementioned wire-cutting mechanism, an upper limit structure is provided between the second cutter body and the scissor holder to prevent the second cutter body from moving radially up and down when the first protrusion disengages from the first guide slope. When the first protrusion slides along the first guide slope, the second cutter body is suspended within the upward movement gap, at which time its tail may sway up and down. The upper limit structure provides an upper constraint for the second cutter body, preventing it from rising excessively due to inertia or vibration.

[0009] In the aforementioned wire-cutting mechanism, the upper limit structure includes a second protrusion on the upper side of the second cutter body, and the scissor holder has an upper notch ramp that gradually slopes upwards from the inner end to the outer end along the axial direction of the second cutter body. When the second cutter body is lifted by the first guide ramp at the bottom, the second protrusion at the top also slides along the upper notch ramp simultaneously. This ensures that the second cutter body is always constrained by both the first guide ramp at the bottom and the upper notch ramp at the top throughout its outward movement and lifting process. This prevents potential swaying of the second cutter body, ensures a stable movement trajectory, and guarantees that the second cutter body always remains in a precise predetermined position.

[0010] In the aforementioned wire-cutting mechanism, the ends of the first and second blades furthest from the cutting head are hinged together via a blade hinge. The structure, with the hinge point located at the tail of the blade, amplifies the minute vertical displacement at the tail of the blade into a large, powerful closing motion at the cutting head, thereby achieving efficient and reliable cutting.

[0011] In the aforementioned wire-cutting mechanism, the first guide and limiting structure includes a first cutter groove, which communicates with a second cutter groove. The handle of the first cutter body is disposed within the first cutter groove, and the first cutter body is connected to a cutter body drive mechanism capable of driving the axial movement of the first cutter body. The inner wall of the first cutter groove can enclose the handle of the first cutter body, ensuring the straightness and repeatability of its movement trajectory. This provides a reliable reference for the subsequent stable movement of the second cutter body. Furthermore, the cutter groove structure is integrated into the body of the scissor holder, possessing high structural rigidity and capable of withstanding the reaction force generated during wire cutting for a long period without deformation, ensuring long-term accuracy.

[0012] In the aforementioned wire-cutting mechanism, the blade driving mechanism includes a single-acting propulsion cylinder mounted on the scissor holder, the output end of which is connected to the first blade. An elastic reset structure is provided between the scissor holder and the handle of the first blade for resetting the first blade after it has moved forward. This elastic reset structure ensures that when the cylinder is depressurized, the stored elastic potential energy is immediately released, automatically pushing the first blade back to its initial position. The reset process is purely mechanically driven without external control signals, thus improving the reliability of the cutting action.

[0013] In the aforementioned wire-cutting mechanism, the output end of the single-acting propulsion cylinder is equipped with a connector, and a reset sensor is provided between the connector and the scissor holder. The connector is connected to the first cutter body by at least one bolt, and / or, the connector is connected to the first cutter body by at least one limiting pin. Using bolts and / or limiting pins achieves a detachable rigid connection between the cylinder and the first cutter body, while also ensuring ease of assembly and connection stability.

[0014] In the aforementioned wire-cutting mechanism, the elastic reset structure includes a reset spring mounted on the scissor holder and located above the first blade. One end of the reset spring is connected to the first blade, and the other end abuts against a spring mounting blind hole in the scissor holder. A guide rod passes through the reset spring, with one end abutting against the first blade and the other end passing through the spring mounting blind hole. The guide rod forces the compression and release of the spring to always proceed along the axial direction of the rod. This ensures that the reset force applied to the first blade is linear, avoiding lateral forces caused by spring tilting, thereby ensuring smooth movement of the first blade within its groove and reducing wear.

[0015] In the above-mentioned wire cutting mechanism, the scissor holder includes a blade mounting base, the first blade groove and the second blade groove are provided on one side of the blade mounting base and are detachably closed by the sealing plate of the adjusting base, and an adjusting mechanism is provided between the adjusting base and the fixed base. The adjustment mechanism includes bolt positioning holes and arc-shaped adjustment holes on the fixed base. The adjustment base has strip-shaped positioning holes that correspond to the bolt positioning holes and arc-shaped adjustment holes. Fixing bolts are inserted between the strip-shaped positioning holes and the bolt positioning holes and arc-shaped adjustment holes, respectively. When it is necessary to clean the lint inside the blade groove, replace the blade, or perform maintenance, the internal parts can be adjusted directly by simply opening the cover plate, reducing maintenance difficulty. Furthermore, by tightening the fixing bolts passing through the strip-shaped holes and arc-shaped holes, the adjustment base can be fixed on the fixed base, ensuring both flexibility and rigidity and stability during operation.

[0016] Compared with existing technologies, the advantages of this thread-cutting mechanism are: 1. High reliability: Utilizing the inclined plane guiding principle, it provides powerful cutting without easily jamming. 2. Only one cylinder is needed for unidirectional linear drive, resulting in low manufacturing cost and control difficulty. 3. Compact structure: The guiding, limiting, and resetting mechanisms are all integrated inside the scissor holder, making it suitable for space-constrained equipment. 4. Convenient maintenance: The scissor slot is removably enclosed, simplifying cleaning, blade replacement, and other maintenance tasks. 5. Flexible adjustment and strong adaptability: The entire assembly can be finely adjusted at the angle, facilitating alignment with the yarn and improving adaptability and versatility on different equipment. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram provided by this utility model.

[0018] Figure 2 This is a top view structural diagram of the present invention.

[0019] Figure 3 This utility model provides Figure 2 Schematic diagram of the cross-sectional structure at point AA.

[0020] Figure 4 This utility model provides Figure 2 Schematic diagram of the cross-sectional structure at point BB.

[0021] Figure 5 This is a schematic diagram of the wire-cutting assembly provided by this utility model.

[0022] Figure 6 This is a schematic diagram of the closed state structure of the wire-cutting assembly provided by this utility model.

[0023] Figure 7 This is a schematic diagram of the fixed base structure provided by this utility model.

[0024] In the figure, the components are: 1. Scissors holder; 11. First guide limiting structure; 111. First cutter groove; 12. Second cutter groove; 121. First guide slope; 122. Upward movement clearance; 123. Upper limit structure; 124. Upper notch ramp; 13. Spring mounting blind hole; 131. Guide rod mounting hole; 14. Cutter body mounting seat; 141. Adjustment seat; 142. Sealing plate; 143. Strip positioning hole; 15. Fixing seat; 151. Bolt positioning hole; 152. Arc-shaped adjustment hole; 153. Fixing seat bolt; 16. Adjustment mechanism; 16. Fixing bolt; 2. Wire cutting assembly; 2. First cutter body; 22. Second cutter body; 221. First protrusion; 222. Second protrusion; 23. Cutter body hinge; 24. Cutter head; 3. Cutter body drive mechanism; 3. Single-acting propulsion cylinder; 31. Connector; 311. Bolt; 312. Limiting pin; 313. Elastic reset structure; 32. Reset spring; 321. Guide rod; 322. Reset sensor; 33. Detailed Implementation

[0025] like Figures 1 to 7 As shown, a wire cutting mechanism includes a scissor frame 1, on which a wire cutting assembly 2 is provided. The wire cutting assembly 2 includes a first blade 21 and a second blade 22 connected by a blade hinge 23. A first guide limiting structure 11 is provided between the first blade 21 and the scissor frame 1 to restrict the first blade 21 to move only in a preset straight direction. A first guide slope 121 is provided on the scissor frame 1, and the first guide slope 121 gradually slopes upward from the inner end to the outer end along the movement path of the second blade 22. A first protrusion 221 is provided on the lower side of the second blade 22 to cooperate with the first guide slope 121. An upward movement gap 122 is provided between the second blade 22 and the scissor frame 1.

[0026] In this embodiment, when the first blade 21 is driven to move outward along a preset straight direction, the first protrusion 221 slides along the first guide slope 121, forcing the second blade 22 to rise relative to the first blade 21 and rotate around the blade hinge 23 within the range of the upward movement gap 122, thereby causing the blade tip of the second blade 22 to close towards the blade tip of the first blade 21 to complete the wire cutting action and achieve a precise and reliable wire cutting effect.

[0027] like Figure 5 and 6 As shown, the handle of the second blade 22 is located in the second blade groove 12 of the scissor holder 1, and an upward movable gap 122 is provided between the second blade 22 and the scissor holder 1. The first guide slope 121 is located at the bottom of the second blade groove 12.

[0028] More specifically, an upper limit structure 123 is provided between the second cutter body 22 and the scissor holder 1 to prevent the second cutter body 22 from moving radially up and down when the first protrusion 221 disengages from the first guide slope 121.

[0029] More specifically, the upper limit structure 123 includes a second protrusion 222 provided on the upper side of the second blade body 22, and the scissor holder 1 is provided with an upper notch ramp 124 that gradually slopes upward from the inner end to the outer end along the axial direction of the second blade body 22.

[0030] More specifically, the ends of the first blade 21 and the second blade 22 furthest from the blade tip 24 are hinged together by the blade hinge 23.

[0031] like Figure 4 As shown, the first guide limiting structure 11 includes a first cutter groove 111, which is connected to the second cutter groove 12. The handle of the first cutter body 21 is disposed in the first cutter groove 111, and the first cutter body 21 is connected to a cutter body driving mechanism 3 that can drive the first cutter body 21 to move axially.

[0032] In this embodiment, the tail ends of the first blade 21 and the second blade 22 of the wire cutting assembly 2 are hinged together by a blade hinge 23. The handle of the first blade 21 is set in the first blade groove 111. The height of the first blade groove 111 is only slightly greater than the height of the first blade 21. The first blade 21 can only move back and forth in the groove. The handle of the second blade 22 is set in the second blade groove 12. The first blade groove 111 and the second blade groove 12 are connected. The second blade groove 12 is located on the side closer to the sealing plate 142. The blades of the first blade 21 and the second blade 22 are provided with blades on the blade head 24 portions that extend out of the blade mounting base 14. The blade of the first blade 21 is located on the lower side of the blade head 24 end, and the blade of the second blade 22 is located on the upper side of the blade head 24 end. During operation, the second blade 22 rotates upward to achieve cutting.

[0033] More specifically, the blade drive mechanism 3 includes a single-acting propulsion cylinder 31 mounted on the scissor holder 1, the output end of which is connected to the first blade 21; and an elastic reset structure 32 for the first blade 21 to move forward and reset is provided between the scissor holder 1 and the handle of the first blade 21.

[0034] like Figure 3 As shown, the output end of the single-acting propulsion cylinder 31 is provided with a connector 311. A reset sensor 33 is provided between the connector 311 and the scissor frame 1. The connector 311 is connected to the first cutter body 21 by a bolt 312, and the connector 311 is also connected to the first cutter body 21 by two limiting pins 313.

[0035] In this embodiment, the connector 311 is connected to one end of the first cutter body 21 near the cutter head 24. When the wire cutting assembly 2 is open, the rear side of the connector 311 abuts against the front side of the cutter body mounting base 14 and contacts one end of the reset sensor 33. The reset sensor 33 is located above the single-acting propulsion cylinder 31 and inside the cutter body mounting base 14.

[0036] More specifically, the elastic reset structure 32 includes a reset spring 321 disposed on the scissor holder 1 and located above the first blade body 21. One end of the reset spring 321 is connected to the first blade body 21, and the other end abuts against the spring mounting blind hole 13 of the scissor holder 1. A guide rod 322 is inserted into the reset spring 321. One end of the guide rod 322 is abutted against and connected to the first blade body 21, and the other end is inserted into the spring mounting blind hole 13.

[0037] In this embodiment, the front end of the spring mounting blind hole 13 is also provided with a guide rod mounting hole 131. The guide rod 322 passes through the spring mounting blind hole 13 and is located inside the guide rod mounting hole 131. The front end of the guide rod 322 can pass through the guide rod mounting hole 131 and extend out of the cutter body mounting seat 14.

[0038] More specifically, the scissor holder 1 includes a blade mounting base 14, a first blade groove 111 and a second blade groove 12 are provided on one side of the blade mounting base 14 and are detachably closed by the sealing plate 142 of the adjusting base 141, and an adjusting mechanism 16 is provided between the adjusting base 141 and the fixed base 15. The adjustment mechanism 16 includes a bolt positioning hole 151 and an arc-shaped adjustment hole 152 on the fixed seat 15. The adjustment seat 141 is provided with a strip-shaped positioning hole 143 that is adapted to the bolt positioning hole 151 and the arc-shaped adjustment hole 152. Fixing bolts 161 are respectively inserted between the strip-shaped positioning hole 143 and the bolt positioning hole 151 and the arc-shaped adjustment hole 152.

[0039] In this embodiment, the fixing seat 15 is connected to the external structure by fixing seat bolts 153 passing through the bolt holes on the fixing seat 15, thereby fixing the position of the entire mechanism.

[0040] The working principle of this embodiment is as follows: When the wire cutting assembly 2 is in the open state, the single-acting propulsion cylinder 31 is activated, and its output end pushes the first cutter body 21 to move outward in a straight line along the first cutter groove 111 through the connector 311. Since the first cutter body 21 and the second cutter body 22 are hinged through the cutter body hinge 23, the second cutter body 22 moves outward horizontally in sync.

[0041] During the outward movement of the second cutter body 22, the first protrusion 221 on its lower side slides along the first guide slope 121 on the scissor frame 1. As the first guide slope 121 gradually slopes upward from the inside to the outside, the first protrusion 221 is guided by the slope surface, forcing the second cutter body 22 to rise upward within the upward movement gap 122 in the second cutter groove 12.

[0042] The lifting motion of the second blade 22 is constrained by the blade hinge 23, and is transformed into a rotational motion around the blade hinge 23, causing the blade head 24 of the second blade 22 to close towards the blade head 24 of the first blade 21, and the two blades shear each other to complete the line cutting action.

[0043] During the lifting process of the second cutter body 22, the second protrusion 222 on its upper side slides along the upper notch ramp 124 on the scissor frame 1, forming a double guide constraint, which effectively prevents the second cutter body 22 from swaying radially and ensures stable motion trajectory and precise closure.

[0044] After the wire cutting is completed, the single-acting propulsion cylinder 31 stops. At this time, the return spring 321 in the elastic return structure 32 releases its elastic potential energy, pushing the first cutter body 21 to return to its original position along the first cutter groove 111. The guide rod 322 inside the return spring 321 ensures that the return process is straight and smooth, avoiding deviation and jamming.

[0045] When cleaning or replacing the blade, the sealing plate 142 on the adjusting seat 141 can be removed to open the first blade groove 111 and the second blade groove 12 for operation. By adjusting the mechanism 16 and loosening the fixing bolt 161, the adjusting seat 141 can be pushed along the arc-shaped adjusting hole 152 to finely adjust the angle of the blade mounting seat 14 to adapt to different installation positions. After adjustment, the bolts can be tightened again to fix it.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0047] Although this document uses numerous terms such as scissor holder, first guide limiting structure, first cutter groove, second cutter groove, first guide slope, upward movable clearance, upper limit structure, upper notch ramp, spring mounting blind hole, guide rod mounting hole, cutter body mounting seat, adjusting seat, sealing plate, strip positioning hole, fixing seat, bolt positioning hole, arc-shaped adjusting hole, fixing seat bolt, adjusting mechanism, fixing bolt, wire cutting assembly, first cutter body, second cutter body, first protrusion, second protrusion, cutter body hinge, cutter head, cutter body drive mechanism, single-acting propulsion cylinder, connector, bolt, limiting pin, elastic reset structure, reset spring, guide rod, and reset sensor, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A wire-cutting mechanism, comprising a scissor frame (1), wherein the scissor frame (1) is provided with a wire-cutting assembly (2), the wire-cutting assembly (2) comprising a first blade (21) and a second blade (22) connected by a blade hinge (23), characterized in that, The first blade (21) and the scissor holder (1) are provided with a first guide limiting structure (11) that restricts the first blade (21) to move only in a preset straight direction. The scissor holder (1) is provided with a first guide slope (121), and the first guide slope (121) gradually slopes upward from the inner end to the outer end along the movement path of the second blade (22). The lower side of the second blade (22) is provided with a first protrusion (221) that cooperates with the first guide slope (121). An upward movement gap (122) is provided between the second blade (22) and the scissor holder (1).

2. The wire-cutting mechanism according to claim 1, characterized in that, The handle of the second blade (22) is set in the second blade groove (12) of the scissor frame (1), and the upward movable gap (122) is provided between the second blade (22) and the scissor frame (1). The first guide slope (121) is set at the bottom of the second blade groove (12).

3. The wire-cutting mechanism according to claim 2, characterized in that, The second cutter body (22) and the scissor frame (1) are further provided with an upper limit structure (123) to prevent the second cutter body (22) from moving radially up and down when the first protrusion (221) disengages from the first guide slope (121).

4. The wire-cutting mechanism according to claim 3, characterized in that, The upper limit structure (123) includes a second protrusion (222) on the upper side of the second blade (22), and the scissor frame (1) is provided with an upper notch ramp (124) that gradually slopes upward from the inner end to the outer end along the axial direction of the second blade (22).

5. The wire-cutting mechanism according to any one of claims 1-4, characterized in that, The first blade (21) and the second blade (22) are hinged at the ends away from the blade head (24) via the blade hinge (23).

6. The wire-cutting mechanism according to claim 2, 3, or 4, characterized in that, The first guide limiting structure (11) includes a first cutting groove (111), which is connected to a second cutting groove (12). The handle of the first cutting body (21) is disposed in the first cutting groove (111), and the first cutting body (21) is connected to a cutting body driving mechanism (3) that can drive the first cutting body (21) to move axially.

7. The wire-cutting mechanism according to claim 6, characterized in that, The blade drive mechanism (3) includes a single-acting propulsion cylinder (31) mounted on the scissor frame (1), the output end of which is connected to the first blade (21); an elastic reset structure (32) for the first blade (21) to move forward and reset is provided between the scissor frame (1) and the handle of the first blade (21).

8. The wire-cutting mechanism according to claim 7, characterized in that, The output end of the single-acting propulsion cylinder (31) is provided with a connector (311), and a reset sensor (33) is provided between the connector (311) and the scissor holder (1). The connector (311) is connected to the first cutter body (21) by at least one bolt (312), and / or the connector (311) is connected to the first cutter body (21) by at least one limiting pin (313).

9. The wire-cutting mechanism according to claim 7, characterized in that, The elastic reset structure (32) includes a reset spring (321) disposed on the scissor holder (1) and located above the first blade (21). One end of the reset spring (321) is connected to the first blade (21), and the other end abuts against the spring mounting blind hole (13) of the scissor holder (1). A guide rod (322) is inserted into the reset spring (321). One end of the guide rod (322) abuts against the first blade (21), and the other end passes through the spring mounting blind hole (13).

10. The wire-cutting mechanism according to claim 6, characterized in that, The scissor holder (1) includes a blade mounting base (14), the first blade groove (111) and the second blade groove (12) are located on one side of the blade mounting base (14) and are detachably closed by the sealing plate (142) of the adjusting base (141), and an adjusting mechanism (16) is provided between the adjusting base (141) and the fixed base (15). The adjustment mechanism (16) includes a bolt positioning hole (151) and an arc-shaped adjustment hole (152) on the fixed seat (15). The adjustment seat (141) is provided with a strip-shaped positioning hole (143) that is adapted to the bolt positioning hole (151) and the arc-shaped adjustment hole (152). Fixing bolts (161) are respectively inserted between the strip-shaped positioning hole (143) and the bolt positioning hole (151) and the arc-shaped adjustment hole (152).

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