Hair-proof rear towing wheel device and sewing machine
By installing an outer cover between the tow wheel and the lower arm of the rear tug device, a mutually perpendicular gap is formed to extend the path of wire wool entering the bearing, the problem of wire wool entering the flange bearing in the prior art is solved, and the normal operation and production efficiency of the device are improved.
Patent Information
- Application Number
- CN202421945482.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The flange bearings of the existing rear tug device are prone to enter the wire wool, resulting in large load on the drive motor, degradation of mop performance, and difficulty in cleaning, affecting production efficiency.
A rear tug device for defending against wire wool is designed. By installing a housing between the tow wheel and the lower arm, and forming a mutually perpendicular gap between the housing and the drive shaft, the path of wire wool entering the bearing is extended to prevent wire wool entering the bearing.
Effectively prevent wire wool from entering the bearing, ensure the normal operation of the rear tug device, reduce the difficulty and workload of cleaning wire wool, and improve production efficiency.
Smart Images
Figure CN222878262U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewing machines, in particular to a rear tug wheel device for preventing thread hair and a sewing machine. Background Art
[0002] During the sewing process, due to the special reasons of the fabric and sewing thread and the particularity of the sewing machine structure, a rear tug device that can drag the fabric backwards and drive the tug wheel to move upward is required to ensure the flatness of the sewing material.
[0003] like Figure 8 As shown, the existing rear tug device includes a lower swing arm 1, a driving shaft 3 and a mopping wheel 2. A pulley (connected to the driving motor) is installed in the lower swing arm 1. The pulley is installed on the right end of the driving shaft 3, and the driving shaft 3 is rotatably connected to the lower swing arm 1 through a flange bearing 4. The left end of the driving shaft 3 is fixedly connected to the mopping wheel 2 through a fastening screw, so that the driving motor drives the mopping wheel 2 to rotate through the transmission action of the driving shaft 3.
[0004] In actual production activities, the rear tugboat device will have different degrees of hair entering the flange bearing, which will eventually lead to a heavy load on the drive motor and reduce the mopping performance of the drive motor. When cleaning, the hair is stuck inside the flange bearing and is extremely difficult to clean. The only way to clean the hair is to disassemble the drive shaft and flange bearing first, and then perform the hair cleaning operation. This will not only increase the workload, but also delay the production schedule.
[0005] Therefore, how to prevent the yarn from entering the flange bearing of the rear tugboat device has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content
[0006] In view of this, the purpose of the utility model is to provide a rear tugboat device that is resistant to wire hair, so as to solve the technical problem that the flange bearing of the existing rear tugboat device is easily penetrated by wire hair.
[0007] The technical solution adopted by the utility model is: a rear tug device for preventing line hair, comprising:
[0008] Lower swing arm;
[0009] A mop wheel, the mop wheel is arranged on one side of the lower swing arm;
[0010] A driving shaft, wherein a first end of the driving shaft is rotatably connected to the bottom end of the lower swing arm through a bearing, and a second end of the driving shaft is fixedly connected to the mopping wheel;
[0011] An outer cover, the outer cover is arranged between the mopping wheel and the lower swing arm, the outer cover is arranged on one side of the bearing and is fixedly connected to the lower swing arm;
[0012] The driving shaft axially penetrates the outer cover, and a first radial gap is formed between the outer cover and the mopping wheel, and a first axial gap is formed between the outer cover and the driving shaft.
[0013] Preferably, a limiting boss is formed on the driving shaft, and a wire-blocking boss is integrally formed on the side of the limiting boss close to the lower swing arm, and the radial dimension of the wire-blocking boss is larger than the radial dimension of the limiting boss, so that a second radial gap is formed between the first end face of the wire-blocking boss and the inner end face of the outer cover, a second axial gap is formed between the outer circumferential surface of the wire-blocking boss and the inner circumferential surface of the outer cover, and a third radial gap is formed between the second end face of the wire-blocking boss and the end face of the lower swing arm.
[0014] Preferably, a protective cover is fixedly connected to the other side of the lower swing arm, the outer cover is arranged on the outer side of the lower swing arm, and the second end surface of the outer cover is in contact with the protective cover.
[0015] Preferably, the width dimensions of the first radial gap, the first axial gap, the second radial gap, the second axial gap and the third radial gap are 0.1 mm-0.2 mm.
[0016] Preferably, an accommodating groove is formed on the second end surface of the wire-blocking boss, and the radial dimension of the accommodating groove is greater than the radial dimension of the bearing.
[0017] Preferably, the outer cover is fixedly connected to the lower swing arm via connecting screws.
[0018] Preferably, a connecting through hole is formed on the outer cover, a threaded hole matching the connecting through hole is formed in the middle of the lower swing arm, and one end of the connecting screw passes through the connecting through hole and is threadedly connected in the threaded hole.
[0019] The second purpose of the utility model is to provide a sewing machine, which includes the above-mentioned rear tugwheel device for preventing thread hair.
[0020] Beneficial effects of the utility model:
[0021] The utility model has an outer cover installed between the mop wheel and the lower swing arm, the outer cover is fixedly connected to the lower swing arm and covers one side of the bearing, and the driving shaft passes through the outer cover and is connected between the lower swing arm and the mop wheel, so that mutually perpendicular gaps are formed among the outer cover, the mop wheel and the driving shaft, which prolongs the path for the yarn hair to enter the bearing, can effectively prevent the yarn hair from entering the bearing, and ensure the normal operation of the rear tug wheel device. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of the rear tug device of the anti-line hair of the utility model;
[0023] Figure 2 for Figure 1A partial enlarged view in FIG.
[0024] Figure 3 It is a schematic diagram of the explosion of the rear tugboat device of the line defense hair of the utility model;
[0025] Figure 4 is a first-person perspective stereoscopic view of the drive shaft;
[0026] Figure 5 is a second perspective stereoscopic view of the drive shaft;
[0027] Figure 6 is a first-person perspective stereoscopic view of the outer cover;
[0028] Figure 7 A second perspective stereoscopic image of the outer cover;
[0029] Figure 8 It is a structural schematic diagram of an existing rear tugboat device.
[0030] Description of reference numerals in the figures:
[0031] 1. Lower arm; 2. Mop wheel; 3. Drive shaft; 4. Bearing; 5. Outer cover; 6. First radial gap; 7. First axial gap; 8. Limiting boss; 9. Wire blocking boss; 10. Second radial gap; 11. Second axial gap; 12. Third radial gap; 13. Protective cover; 14. Connecting screw; 15. Connecting through hole; 16. Threaded hole; 17. Pulley; 18. Fastening screw; 19. Accommodating groove; 20. Through hole. DETAILED DESCRIPTION
[0032] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.
[0033] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.
[0036] Examples, such as Figure 1-Figure 7 As shown, a rear tug wheel device for preventing thread hair is characterized in that it includes: a lower swing arm 1, a mop wheel 2, a drive shaft 3, a bearing 4 and an outer cover 5, the mop wheel 2 is arranged at one side of the lower swing arm 1, the first end of the drive shaft 3 is rotatably connected to the bottom end of the lower swing arm 1 through the bearing 4, and the second end of the drive shaft 3 is fixedly connected to the mop wheel 2; the outer cover 5 is arranged between the mop wheel 2 and the lower swing arm 1, and the outer cover 5 is covered on one side of the bearing 4 and fixedly connected to the lower swing arm 1, the drive shaft 3 axially penetrates the outer cover 5, and a first radial gap 6 is formed between the outer cover 5 and the mop wheel 2, and a first axial gap 7 is formed between the outer cover 5 and the drive shaft 3.
[0037] In the present application, an outer cover 5 is installed between the mop wheel 2 and the lower swing arm 1. The outer cover 5 is fixedly connected to the lower swing arm 1 and covers one side of the bearing 4. The drive shaft 3 passes through the outer cover 5 and is connected between the lower swing arm 1 and the mop wheel 2, so that a first radial gap 6 and a first axial gap 7 perpendicular to each other are formed between the outer cover 5, the mop wheel 2 and the drive shaft 3, which extends the path for the wool to enter the bearing 4, can effectively prevent the wool from entering the inside of the bearing 4, and thus ensure the normal operation of the rear tug device.
[0038] Specific embodiments, such as Figure 1-Figure 7As shown, a rear tug wheel device for preventing thread hair is characterized in that it includes: a lower swing arm 1, a mop wheel 2, a drive shaft 3, a bearing 4 and an outer cover 5, the mop wheel 2 (preferably a polyurethane roller) is arranged on the left side of the lower swing arm 1, the right end of the drive shaft 3 is rotatably connected to the bottom end of the lower swing arm 1 through a bearing 4 (preferably a flange bearing), and the left end of the drive shaft 3 is fixedly connected to the mop wheel 2 through a fastening screw 18; the outer cover 5 is arranged between the mop wheel 2 and the lower swing arm 1, and the outer cover 5 is covered on the left side of the bearing 4 and fixedly connected to the lower swing arm 1; a through hole 20 is formed on the outer cover 5, and the radial size of the through hole 20 is larger than the radial size of the drive shaft 3, the drive shaft 3 is axially penetrated in the through hole 20 of the outer cover 5, and a first radial gap 6 is formed between the outer cover 5 and the mop wheel 2, and a first axial gap 7 is formed between the outer cover 5 and the drive shaft 3, and the first radial gap 6 and the first axial gap 7 are vertically connected.
[0039] A limiting boss 8 is formed on the driving shaft 3, and the left end face of the limiting boss 8 abuts against the mop wheel 2, and a wire-blocking boss 9 is integrally formed on the side of the limiting boss 8 close to the lower swing arm 1. The radial dimension of the wire-blocking boss 9 is larger than the radial dimension of the limiting boss 8 and smaller than the inner diameter dimension of the outer cover 5, so that a second radial gap 10 is formed between the left end face of the wire-blocking boss 9 and the inner end face of the outer cover 5, a second axial gap 11 is formed between the outer circumferential surface of the wire-blocking boss 9 and the inner circumferential surface of the outer cover 5, and a third radial gap 12 is formed between the right end face of the wire-blocking boss 9 and the end face of the lower swing arm 1, and the second radial gap 10, the second axial gap 11 and the third radial gap 12 are vertically connected to extend the path for the wire hair to enter the interior of the bearing 4, thereby preventing the wire hair from entering the interior of the bearing 4, and also facilitating the cleaning of the wire hair that enters the interior of the outer cover 5.
[0040] Preferably, an accommodating groove 19 is formed on the right end surface of the wire blocking boss 9 , and the radial dimension of the accommodating groove 19 is larger than the radial dimension of the bearing 4 , so that the left end of the bearing 4 is accommodated in the accommodating groove 19 .
[0041] More preferably, the widths of the first radial gap 6, the first axial gap 7, the second radial gap 10, the second axial gap 11 and the third radial gap 12 are 0.1 mm to 0.2 mm.
[0042] In other embodiments, a protective cover 13 is fixedly connected to the right side of the lower swing arm 1, and the protective cover 13 is fixedly connected to the lower swing arm 1 to form a receiving cavity for accommodating the pulley 17 and the transmission belt; the outer cover 5 is arranged on the outside of the lower swing arm 1, and the right end face of the outer cover 5 abuts against the left end face of the protective cover 13 to improve the sealing performance of the connection between the outer cover 5 and the lower swing arm 1.
[0043] The fixed connection between the outer cover 5 and the lower swing arm 1 can be achieved by any known connection method. The following is only an exemplary description to introduce in detail one of the optimal connection methods: the outer cover 5 is fixedly connected to the lower swing arm 1 by connecting screws 14 to facilitate the disassembly and assembly of the outer cover 5, and then to facilitate the cleaning of the thread hair that enters the inner part of the outer cover 5.
[0044] Specifically, at least one connecting through hole 15 is formed on the outer cover 5, and a threaded hole 16 matching the connecting through hole 15 is formed on the lower swing arm 1. The threaded hole 16 and the connecting through hole 15 are in a one-to-one correspondence. One end of the connecting screw 14 passes through the connecting through hole 15 and is threadedly connected to the threaded hole 16.
[0045] Embodiment, a sewing machine, the sewing machine comprises the above-mentioned rear tug wheel device for preventing thread hair.
[0046] The use process of the rear tug device of the anti-line hair of the utility model is as follows:
[0047] When the mop wheel 2 is running, due to electrostatic adsorption, the edge wire of the fabric will be entangled and enter the installation gap between the lower arm 1 and the drive shaft 3. The outer cover 5 and the wire blocking boss 9 can effectively extend the path of the wire hair and prevent the wire hair from entering the inside of the bearing 4. When cleaning the wire hair, it is only necessary to disassemble the mop wheel 2 and the outer cover 5 without disassembling the drive shaft 3 and the bearing 4.
[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.
Claims
1. A rear tug device for preventing line hair, characterized in that: include: Lower swing arm (1); A mop wheel (2), wherein the mop wheel (2) is arranged on one side of the lower swing arm (1); A driving shaft (3), wherein a first end of the driving shaft (3) is rotatably connected to the bottom end of the lower swing arm (1) via a bearing (4), and a second end of the driving shaft (3) is fixedly connected to the mopping wheel (2); An outer cover (5), the outer cover (5) being arranged between the mopping wheel (2) and the lower swing arm (1), the outer cover (5) being arranged on one side of the bearing (4) and being fixedly connected to the lower swing arm (1); The drive shaft (3) axially penetrates the outer cover (5), and forms a first radial gap (6) between the outer cover (5) and the mopping wheel (2), and a first axial gap (7) between the outer cover (5) and the drive shaft (3).
2. A rear tug device for preventing thread hair according to claim 1, characterized in that: A limiting boss (8) is formed on the driving shaft (3), and a wire-blocking boss (9) is integrally formed on one side of the limiting boss (8) close to the lower swing arm (1), and the radial dimension of the wire-blocking boss (9) is greater than the radial dimension of the limiting boss (8), so that a second radial gap (10) is formed between the first end face of the wire-blocking boss (9) and the inner end face of the outer cover (5), a second axial gap (11) is formed between the outer circumferential surface of the wire-blocking boss (9) and the inner circumferential surface of the outer cover (5), and a third radial gap (12) is formed between the second end face of the wire-blocking boss (9) and the end face of the lower swing arm (1).
3. A rear tug device for preventing thread hair according to claim 2, characterized in that: The other side of the lower swing arm (1) is fixedly connected with a protective cover (13); the outer cover (5) is arranged on the outside of the lower swing arm (1), and the second end surface of the outer cover (5) abuts against the protective cover (13).
4. A rear tug device for preventing thread hair according to claim 2, characterized in that: The width dimensions of the first radial gap (6), the first axial gap (7), the second radial gap (10), the second axial gap (11) and the third radial gap (12) are 0.1 mm to 0.2 mm.
5. The rear tug device for preventing thread hair according to claim 2, characterized in that: An accommodating groove (19) is formed on the second end surface of the wire blocking boss (9), and the radial dimension of the accommodating groove (19) is greater than the radial dimension of the bearing (4).
6. The rear tug device for preventing thread hair according to claim 1, characterized in that: The outer cover (5) is fixedly connected to the lower swing arm (1) via connecting screws (14).
7. A rear tug device for preventing thread hair according to claim 6, characterized in that: A connecting through hole (15) is formed on the outer cover (5), a threaded hole (16) matching the connecting through hole (15) is formed in the middle of the lower swing arm (1), and one end of the connecting screw (14) passes through the connecting through hole (15) and is threadedly connected to the threaded hole (16).
8. A sewing machine, characterized in that: The sewing machine comprises the rear tug wheel device for preventing thread hair as described in any one of claims 1-7.