Thread trimming device applied to computerized roller car
By designing an independent moving mechanism wire cutting device on the computer roller, the problems of unstable wire cutting and needing secondary trim are solved, and the effect of stabilizing wire cutting and simplifying maintenance is achieved, and the work efficiency is improved.
Patent Information
- Application Number
- CN202422082664.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The existing computer roller-cutting device requires secondary trimming, which is unstable and prone to failure, making it inconvenient to repair and replace parts.
A wire-cutting device including a rotary shuttle seat, axle shaft sleeve, bearing, transmission gear, fixed tool holder, moving tool holder and wire clipper are designed. The stable wire-cutting action is achieved through motor drive and electromagnet control. The wire-cutting edge and the fixed tool cutter edge are used to cut the wire, and the wire head is very short after the wire-cutting.
The stability of the thread cutting effect is achieved, and the thread cutting head is extremely short, which reduces the need for manual trimming, improves work efficiency and simplifies the repair and replacement process.
Smart Images
Figure CN223061214U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thread cutting devices, and particularly relates to a thread cutting device applied to a computerized lockstitch sewing machine. Background Art
[0002] A computerized lockstitch sewing machine is a type of industrial thick-material sewing machine. It uses computer control technology to send instructions through a computer, and realizes automated sewing with multiple functions through motors, electromagnets, mechanical mechanisms, etc. The upper and lower threads are stitched together on one or more layers of sewing materials to form a lockstitch. The stitch is neat, beautiful, flat and firm, and can sew various fabric products such as leather, artificial fibers, and fabrics. It is mainly used for the thick-material sewing of leather shoes, luggage, seat cushions, etc.
[0003] In the existing thread cutting device of a computerized lockstitch sewing machine, it consists of a rotary hook base, an axel, a toothed axel outer sleeve, a moving knife body, a fixed knife, a thread clamping piece, a thread cutting crank, a toothed fixed knife assembly, a thread cutting cam assembly, etc. The computer controls the electromagnet to complete the thread cutting operation within a set time, forming a series of continuous actions of hooking the thread, clamping the thread, and cutting the thread, which greatly improves work efficiency. However, due to differences in thread cutting devices, the thread ends left on the sewing material after thread cutting are all relatively long and must be manually trimmed a second time. Moreover, the thread cutting is unstable and prone to failures. Due to structural limitations, it is not convenient to install, and it is extremely inconvenient to repair when a failure occurs. When replacing parts, a large area needs to be disassembled, and the repair efficiency is extremely low. Content of the Utility Model
[0004] (I) Technical Problems to be Solved
[0005] Aiming at the deficiencies of the prior art, the utility model provides a thread cutting device applied to a computerized lockstitch sewing machine, which solves the technical problems that the existing thread cutting device must be trimmed a second time, and the thread cutting is unstable and prone to failures.
[0006] (II) Technical Solutions
[0007] To achieve the above purposes, the utility model is realized through the following technical solutions:
[0008] A thread cutting device applied to a computerized lockstitch sewing machine, including a rotary hook base. A through hole one and a through hole two are opened on the upper surface of the rotary hook base. An axel outer sleeve is movably connected inside the through hole one. The axel outer sleeve extends to the outside of the through hole one. A connecting axel is arranged inside the axel outer sleeve. A bearing is arranged inside the axel outer sleeve. The connecting axel is rotationally connected with the axel outer sleeve through the bearing. The upper end surface of the connecting axel is fixedly connected with a rotary hook, and a transmission gear is fixedly installed at the lower shaft end. A fixed knife base is fixedly installed on the upper surface of the rotary hook base. A fixed knife body is fixedly connected to the left side surface of the fixed knife base, and a thread clamping piece is fixedly installed on the right side surface. A moving knife shaft is movably connected inside the through hole two. The top end of the moving knife shaft is fixedly connected with a moving knife base, and the top end of the moving knife base is fixedly connected with a moving knife body. A wire outlet groove opening and a thread cutting edge are opened on the upper surface of the moving knife body.
[0009] Preferably: A thread cutting edge is arranged on the right side surface of the wire outlet groove opening and near the top edge. A fixed knife edge is arranged on the left side surface of the fixed knife body. The thread clamping piece is located below the fixed knife body.
[0010] Preferably: The shapes of both the fixed knife body and the thread clamping piece are "L" shaped. A horn base is sleeved outside the axel outer sleeve. An internal hexagonal bolt is arranged on the horn base. The horn base is connected and fixed with the axel outer sleeve through the internal hexagonal bolt.
[0011] Preferably: A horn is arranged on the protruding part at the upper end of the horn base. Two opening grooves are opened on the surface of the horn. A bolt is installed on the horn. The horn is connected and fixed with the horn base through the bolt.
[0012] Preferably: A wire hooking groove is opened on the upper surface of the moving knife body and on the left side of the wire outlet groove opening. The wire hooking groove is communicated with the wire outlet groove opening. A through hole three is arranged at the left end of the wire hooking groove. The upper end of the through hole three intersects with the thread cutting edge.
[0013] (III) Advantageous effects
[0014] First, the structure of this device is extremely simple. Each moving mechanism is basically independent, with characteristics such as simple workpiece processing and assembly processes, convenient adjustment, maintenance, and replacement. The thread cutting effect is stable, the cut thread end is extremely short, no secondary trimming is required, reducing labor costs and improving work efficiency. Brief description of the drawings
[0015] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it in accordance with the content of the description, the following takes the preferred embodiment of the present invention and combines with the drawings to describe in detail as follows.
[0016] Figure 1This is the overall structure diagram of the thread cutting device applied to a computerized lockstitch sewing machine of the present utility model.
[0017] Legend: 1. Rotating shuttle base; 11. Axe shaft; 12. Horn; 13. First through hole; 14. Second through hole; 15. Outlet groove rough edge; 16. Thread cutting edge; 17. Fixed blade edge; 2. Outer sleeve of axe shaft; 3. Fixed knife base; 4. Fixed knife body; 5. Thread clamping piece; 6. Moving knife body; 7. Moving knife base; 8. Moving knife shaft; 9. Horn base. Specific embodiments
[0018] By providing a thread cutting device applied to a computerized lockstitch sewing machine in an embodiment of the present application, the problems that the existing thread cutting device must be trimmed a second time, the thread cutting is unstable and prone to failure are effectively solved. The thread cutting device applied to the computerized lockstitch sewing machine has an extremely simple structure, and each moving mechanism is basically independent. It has the characteristics of simple workpiece processing and assembly processes, convenient adjustment, maintenance and replacement, stable thread cutting effect, extremely short cut thread ends, no need for secondary trimming, reduced labor costs and improved work efficiency.
[0019] Embodiment: As Figure 1 shown, the technical solution in the embodiment of the present application effectively solves the technical problems that the existing thread cutting device must be trimmed a second time, the thread cutting is unstable and prone to failure. The general idea is as follows:
[0020] In view of the problems existing in the prior art, the utility model provides a thread cutting device applied to a computerized lockstitch sewing machine, which includes a rotary hook base 1. A through hole one 13 and a through hole two 14 are provided on the upper surface of the rotary hook base 1. An axe shaft outer sleeve 2 is movably connected inside the through hole one 13. The axe shaft outer sleeve 2 extends to the outside of the through hole one 13. A connecting axe shaft 11 is arranged inside the axe shaft outer sleeve 2. A bearing is arranged inside the axe shaft outer sleeve 2. The connecting axe shaft 11 is rotationally connected with the axe shaft outer sleeve 2 through the bearing. The upper end surface of the connecting axe shaft 11 is fixedly connected with a rotary hook. A transmission gear is fixedly installed at the lower shaft end. A fixed knife base 3 is fixedly installed on the upper surface of the rotary hook base 1. A fixed knife body 4 is fixedly connected to the left side surface of the fixed knife base 3. A thread clamping piece 5 is fixedly installed on the right side surface. A moving knife shaft 8 is movably connected inside the through hole two 14. The top end of the moving knife shaft 8 is fixedly connected with a moving knife base 7. The top end of the moving knife base 7 is fixedly connected with a moving knife body 6. A wire outlet groove burr 15 and a thread cutting edge 16 are provided on the upper surface of the moving knife body 6. The thread cutting edge 16 is arranged on the right side surface of the wire outlet groove burr 15 and near the top edge. A fixed knife edge 17 is arranged on the left side surface of the fixed knife body 4. The thread clamping piece 5 is located below the fixed knife body 4. The shapes of the fixed knife body 4 and the thread clamping piece 5 are both "L" shaped. A horn base 9 is sleeved outside the axe shaft outer sleeve 2. An internal hexagonal bolt is arranged on the horn base 9. The horn base 9 is connected and fixed with the axe shaft outer sleeve 2 through the internal hexagonal bolt. A horn 12 is arranged on the protruding part at the upper end of the horn base 9. Two open grooves are provided on the surface of the horn 12. A bolt is installed on the horn 12. The horn 12 is connected and fixed with the horn base 9 through the bolt. A wire hooking groove is provided on the upper surface of the moving knife body 6 and on the left side of the wire outlet groove burr 15. The wire hooking groove is communicated with the wire outlet groove burr 15. A through hole three is provided at the left end of the wire hooking groove. The upper end of the through hole three intersects with the thread cutting edge 16.
[0021] Working principle:
[0022] 1. Independent rotary hook rotating mechanism: A transmission gear is fixedly connected to the lower end of the axe shaft 11, and it can be driven by using a motor to drive the gear.
[0023] 2. Independent inner axe in the horn block and wire passing and outlet mechanism: A horn base 9 is fixedly connected to the outside of the axe shaft outer sleeve 2. A horn 12 is fixedly connected to the protruding part at the upper end of the horn base 9. The extended end angle of the horn 12 blocks the inner axe of the rotary hook, which is used to block the inner axe of the rotary hook to prevent it from rotating and for wire passing and outlet.
[0024] 3. Independent moving knife mechanism for thread cutting: A through hole II 14 on the upper surface of the rotary hook base 1 is movably connected to a moving knife shaft 8. The upper end of the moving knife shaft 8 is fixedly connected to a moving knife seat 7, and the upper end of the moving knife seat 7 is fixedly connected to a moving knife body 6. The lower end of the moving knife shaft 8 is movably connected to a knife shaft crank. Then, through mechanisms such as a connecting thread cutting pull rod, a thread cutting swing body, and a thread cutting cam, the moving knife body 6 is driven to move. Moreover, the moving amplitude of the moving knife body 6 and the thread cutting time are determined by the shape of the thread cutting cam and the moving knife shaft crank on the computerized roller sewing machine and are set electronically.
[0025] 4. Independent stationary knife and thread clamping mechanism: A stationary knife seat 3 is fixedly installed on the upper surface of the rotary hook base 1, which plays a role in facilitating installation and positioning. The left side surface of the stationary knife seat 3 is fixedly connected to a stationary knife body 4, and a thread clamping piece 5 is fixedly installed on the right side surface.
[0026] 5. Coordination between the above independent mechanisms: A thread cutting edge 16 is provided on the left side surface of the outlet groove burr 15 of the moving knife body 6 and near the top edge. The thread cutting edge 16 of the moving knife body 6 is close to the directly front position at the bottom of the needle plate hole. When the moving knife body 6 reciprocates in the axial direction along with the moving knife seat 7 and the moving knife shaft 8, its thread cutting edge 16 coincides and intersects with the stationary knife edge 17 provided on the right side surface of the stationary knife body 4 to form thread cutting and cut the thread. A thread clamping piece 5 is fixedly connected to the right side surface of the stationary knife seat 3. The stationary knife body 4 and the thread clamping piece 5 are respectively fixedly installed on the stationary knife seat 3 and extend into the bottom of the needle plate hole. At the thread cutting position that coincides with the thread cutting edge 16 part of the moving knife body 6, the purpose of leaving a short thread end for the sewn material after cutting is achieved. The thread clamping piece 5 is located below the stationary knife body 4. The shapes of both the stationary knife body 4 and the thread clamping piece 5 are "L" - shaped. When the moving knife body 6 is not cutting the thread, it is located on the right side of the rotary hook base 1. When cutting the thread, the moving knife body 6 moves to the left. When swinging back, the upper and lower threads are hooked by the outlet groove burr 15 of the moving knife body 6 and cooperate with the thread clamping piece 5 to clamp the thread. At the same time, the thread cutting edge 16 of the moving knife body 6 coincides and intersects with the stationary knife edge 17 of the stationary knife body 4 to form thread cutting and cut the sewing machine needle thread. Since both the moving knife thread cutting edge 16 and the stationary knife edge 17 are close to the needle plate hole, the cut thread ends are very short.
[0027] 6. The horn base 9 is fixedly connected to the axletree outer sleeve 2 through an internal hexagonal bolt. Two opening grooves are provided on the surface of the horn 12 and locked with bolts, making disassembly and assembly very convenient.
[0028] 7. During use, the motor drives the thread cutting cam mechanism to rotate. The electromagnet receives the electronically controlled thread cutting instruction and pushes the thread cutting swing body mechanism to work. In cooperation with the thread cutting cam mechanism, it pulls the knife crank. The moving knife crank drives the moving knife shaft 8 to reciprocate along the axis, driving the moving knife seat 7 and the moving knife body 6 to reciprocate, forming continuous thread hooking, thread clamping, and thread cutting actions with the stationary knife body 4 and the thread clamping piece 5 installed on the stationary knife seat 3, cutting the upper and lower sewing threads simultaneously. After thread cutting, the moving knife body 6 returns to the original set position and waits for the next thread cutting instruction.
[0029] The thread cutting mechanism is independent. The horn for fixing the rotating shuttle is locked on the axe shaft, making adjustment more convenient and accurate. Without changing the thread cutting effect, assembly and maintenance are more convenient.
[0030] Finally, it should be noted that: Obviously, the above embodiments are merely examples given to clearly illustrate the present utility model, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.
Claims
1. A thread cutting device applied to a computerized lockstitch sewing machine, comprising a rotating hook base (1), characterized in that: The upper surface of the rotating shuttle base (1) is provided with a first through hole (13) and a second through hole (14). The inside of the first through hole (13) is movably connected to an axletree outer sleeve (2), and the axletree outer sleeve (2) extends to the outside of the first through hole (13). The inside of the axletree outer sleeve (2) is provided with a connecting axletree (11). The inside of the axletree outer sleeve (2) is provided with a bearing. The connecting axletree (11) is rotationally connected to the axletree outer sleeve (2) through the bearing. The upper end surface of the connecting axletree (11) is fixedly connected to a rotating shuttle, and a transmission gear is fixedly installed at the lower shaft end. Among them, a fixed knife base (3) is fixedly installed on the upper surface of the rotating shuttle base (1). The left side surface of the fixed knife base (3) is fixedly connected to a fixed knife body (4), and a thread clamping piece (5) is fixedly installed on the right side surface. The inside of the second through hole (14) is movably connected to a moving knife shaft (8). The top end of the moving knife shaft (8) is fixedly connected to a moving knife base (7), and the top end of the moving knife base (7) is fixedly connected to a moving knife body (6). The upper surface of the moving knife body (6) is provided with a wire outlet groove burr (15) and a thread cutting edge (16).
2. The thread trimming device applied to a computerized cylinder sewing machine according to claim 1, wherein: The thread cutting edge (16) is arranged on the right side surface of the wire outlet groove burr (15) and close to the top edge. Among them, a fixed knife edge (17) is arranged on the left side surface of the fixed knife body (4).
3. The thread trimming device applied to a computerized cylinder sewing machine according to claim 1, wherein: The thread clamping piece (5) is located below the fixed knife body (4).
4. The thread trimming device applied to a computerized cylinder sewing machine according to claim 3, wherein: The shapes of the fixed knife body (4) and the thread clamping piece (5) are both "L" shaped.
5. The thread trimming device applied to a computerized cylinder sewing machine according to claim 1, wherein: The outside of the axletree outer sleeve (2) is sleeved with a horn base (9), and an inner hexagon bolt is arranged on the horn base (9). Among them, the horn base (9) is connected and fixed to the axletree outer sleeve (2) through the inner hexagon bolt.
6. The thread trimming device applied to a computerized cylinder bed sewing machine according to claim 5, characterized in that: A horn (12) is arranged on the protruding part at the upper end of the horn base (9), and two open grooves are arranged on the surface of the horn (12). Among them, a bolt is installed on the horn (12), and the horn (12) is connected and fixed to the horn base (9) through the bolt.
7. The thread trimming device applied to a computerized cylinder bed sewing machine according to claim 1, wherein: A wire hooking groove is arranged on the upper surface of the moving knife body (6) and on the left side of the wire outlet groove burr (15). Among them, the wire hooking groove is communicated with the wire outlet groove burr (15). A third through hole is arranged at the left end of the wire hooking groove, and the upper end of the third through hole intersects with the thread cutting edge (16).