Thread jamming protection clutch mechanism of sewing machine
By designing a thread protection clutch mechanism in the sewing machine, using the combination of meshing gears and elastic parts, the protection function when thread clutch occurs in the sewing machine is realized, avoiding damage or displacement of transmission parts and ensuring the normal operation of the equipment.
Patent Information
- Application Number
- CN202420467136.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-03-11
AI Technical Summary
During use, sewing machines are prone to wire jams due to improper human operation or failure, resulting in damage or displacement of the transmission parts of the equipment, and cannot be used normally.
Design a sewing machine thread protection clutch mechanism, including a rotating shaft, gear, slider and handwheel, by providing intermeshing first crown gear and second crown gear, and using elastic members to provide axial force, the gear and rotation shaft are Rotate normally within a certain range; when the resistance increases, the slider slides backwards, and the first crown gear and the second crown gear disengage, achieving clutch slippage and avoiding the handwheel's strong rotation on the shaft.
It effectively avoids damage or displacement of the sewing machine transmission parts caused by thread clamping, ensures that the sewing machine will not cause excessive pressure to the transmission parts when thread clamping occurs, and protects the normal operation of the equipment.
Smart Images
Figure CN222455479U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewing machines, in particular to a thread jam protection clutch mechanism for sewing machines. Background Art
[0002] The structure of a sewing machine generally includes a sewing machine base, a sewing machine head connected to the sewing machine base, and a driving mechanism. The sewing machine head is provided with a sewing needle bar and a thread take-up rod. The sewing needle bar is fixed with a sewing needle. The driving mechanism drives the sewing needle to move up and down while driving the selection rod to swing up and down at high speed. The swing of the selection rod drives the sewing thread to reciprocate up and down to realize the supply and recovery of sewing thread, so that the stitches formed by the upper thread and the lower thread are tightened, and the amount of thread required for a stitch is drawn from the thread tube. During the use of the sewing machine, the thread take-up rod, the clamping piece and other components in the outer thread lead assembly are used to thread the thread lead rope. External objects are easy to come into contact with the thread rope, causing the thread rope to become entangled. When the sewing machine is stuck due to improper human operation or malfunction, if the hand wheel on the upper shaft of the sewing machine is turned vigorously, other transmission components and core internal and external working components of the equipment will be damaged or displaced, causing the equipment to be unable to be used normally. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a thread jamming protection clutch mechanism for a sewing machine.
[0004] According to the first aspect of the present invention, the thread jamming protection clutch mechanism of a sewing machine comprises a rotating shaft and a gear, a sliding member and a hand wheel which are sequentially sleeved on the rotating shaft from front to back, the gear is fixedly connected to the rotating shaft, the sliding member and the hand wheel are both clearance-matched with the rotating shaft, a first crown gear is fixedly provided on the rear end face of the gear, the first crown gear is coaxially arranged with the gear, the sliding member comprises a first ring body and a second crown gear meshing with the first crown gear, the second crown gear is fixedly arranged at the front end of the first ring body and coaxially arranged with the first ring body, the first ring body is axially connected to the hand wheel for sliding, an elastic member for driving the second crown gear to press against the first crown gear is provided between the first ring body and the hand wheel, and when the first crown gear and the second crown gear are in a meshing state, there is a space between the sliding member and the hand wheel for the sliding member to slide backwards until the first crown gear and the second crown gear are disengaged from each other.
[0005] The thread jam protection clutch mechanism for a sewing machine according to the embodiment of the utility model has at least the following beneficial effects:
[0006] The utility model provides a first crown gear and a second crown gear meshing with each other between the gear and the hand wheel, and the second crown gear is subjected to an axial force provided by an elastic member, so that the first crown gear and the second crown gear mesh with each other. When the torque transmitted by rotating the hand wheel is within a certain range, the first crown gear and the second crown gear will not slip relative to each other, thereby driving the gear to drive the rotating shaft (i.e., the upper shaft of the sewing machine) to rotate, and the sewing machine operates normally; when the sewing machine is entangled with thread, the rotating shaft resistance increases, so that the torque transmitted by rotating the hand wheel exceeds a critical value, the tooth root surface of the second crown gear climbs toward the tooth top surface, and at the same time the elastic member is further compressed, and the sliding member slides backward along the axial direction until the first crown gear and the second crown gear are separated from each other, so that clutch slippage is achieved, thereby avoiding forced rotation of the hand wheel on the rotating shaft, and protecting the transmission components of the sewing machine from damage or displacement.
[0007] According to some embodiments of the utility model, the elastic member is a spring, one end of which abuts against the first ring body, and the other end abuts against the hand wheel. The spring has high strength and stiffness, but its own weight is relatively light, and will not add excessive load to the mechanical system. The stiffness of the spring can be adjusted as needed. By changing the material, cross-sectional shape, pitch and other parameters of the spring, different torque protection thresholds can be achieved, and the spring is not easy to fatigue, deform or break.
[0008] According to some embodiments of the utility model, the first ring body includes an outer ring body and an inner ring body coaxially arranged from outside to inside and a first side wall connected between the outer ring body and the inner ring body, the first side wall is located at the front end of the outer ring body and the inner ring body, the inner ring body is in clearance fit with the rotating shaft, and one end of the spring is sleeved on the inner ring body and abuts against the first side wall. Sleeving one end of the spring in the narrow space surrounded by the outer ring body, the inner ring body and the first side wall can reduce the radial displacement of the spring and ensure the stability and reliability of the work.
[0009] According to some embodiments of the utility model, the hand wheel includes a shell, a second ring body and a third ring body coaxially arranged from outside to inside, and a second side wall connected between the second ring body and the third ring body, the second side wall is located at the rear ends of the second ring body and the third ring body, the third ring body is in clearance fit with the rotating shaft, and the other end of the spring is sleeved on the third ring body and abuts against the second side wall. The other end of the spring is sleeved in the narrow space surrounded by the second ring body, the third ring body and the second side wall, which can reduce the radial displacement of the spring and ensure the stability and reliability of the work.
[0010] According to some embodiments of the utility model, a slide groove is provided on the outer wall of the outer ring body, and a slider matching the slide groove is provided on the inner wall of the second ring body. The connection between the slide groove and the slider enables the hand wheel to drive the sliding part to rotate and to slide the sliding part axially.
[0011] According to some embodiments of the utility model, when the first crown gear and the second crown gear are in meshing state, the distance from the bottom of the slide groove to the slider is greater than or equal to the distance the slider needs to slide when the first crown gear and the second crown gear are separated from each other, so as to ensure that the slider has enough displacement space to smoothly separate the first crown gear and the second crown gear.
[0012] According to some embodiments of the utility model, the tooth tops and tooth roots of the gear teeth of the first crown gear and the second crown gear are in arc shape, the tooth tops are in convex arc shape, and the tooth roots are in concave arc shape, so that the overall tooth surface of the gear teeth is wavy. The torque protection threshold can be controlled by designing the arc degree of the tooth tops and tooth roots. The smoother the concave-convex transition of the tooth surface, the easier it is for the first crown gear and the second crown gear to slip and disengage.
[0013] According to some embodiments of the utility model, a retaining spring is provided on the rotating shaft, and the retaining spring abuts against the rear end surface of the third ring body. The retaining spring plays a limiting role and is used to fix the position of the hand wheel.
[0014] According to some embodiments of the utility model, the rear end face of the housing is provided with a detachable end cap, which can cover the end of the shaft to prevent the internal parts from being exposed and affecting the appearance, and is also convenient for repairing or replacing the parts on the shaft, and is easy to disassemble and assemble.
[0015] According to some embodiments of the present invention, the outer diameter of the second crown gear is greater than the outer diameter of the outer ring body.
[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 It is a cross-sectional view of the utility model;
[0020] Figure 3 This is an exploded view from the first perspective of the present utility model;
[0021] Figure 4 This is an exploded view of the utility model from a second perspective.
[0022] Figure numerals: rotating shaft 100, gear 200, first crown gear 210, sliding member 300, first ring body 310, outer ring body 311, inner ring body 312, first side wall 313, slide groove 314, second crown gear 320, hand wheel 400, housing 410, second ring body 420, slider 421, third ring body 430, second side wall 440, spring 500, end cover 600. DETAILED DESCRIPTION
[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0024] Reference Figure 1-4 A thread jamming protection clutch mechanism for a sewing machine comprises a rotating shaft 100 and a gear 200, a sliding member 300 and a hand wheel 400 which are sequentially sleeved on the rotating shaft 100 from front to back. The gear 200 is fixedly connected to the rotating shaft 100. The sliding member 300 and the hand wheel 400 are both clearance-matched with the rotating shaft 100. A first crown gear 210 is fixedly arranged on the rear end surface of the gear 200. The first crown gear 210 is coaxially arranged with the gear 200. The sliding member 300 comprises a first ring body 310 and a second crown gear 320 meshing with the first crown gear 210. The second crown gear 320 is fixed to the front end of the first ring body 310 and is coaxially arranged with the first ring body 310. The first ring body 310 is slidably connected with the hand wheel 400 along the axial direction. An elastic member for driving the second crown gear 320 to press against the first crown gear 210 is provided between the first ring body 310 and the hand wheel 400. When the first crown gear 210 and the second crown gear 320 are in a meshing state, there is a space between the sliding member 300 and the hand wheel 400 for the sliding member 300 to slide backward until the first crown gear 210 and the second crown gear 320 are separated from each other. The rotating shaft 100 of this embodiment is the upper shaft of the sewing machine. Under normal operation, the hand wheel 400 is rotated to transmit its torque to the second crown gear 320 through the sliding connection between the first ring body 310 and the hand wheel 400, and then the gear 200 is driven to rotate through the engagement of the second crown gear 320 with the first crown gear 210, and the gear 200 drives the rotating shaft 100 to rotate through its fixed connection with the rotating shaft 100; when the sewing machine is entangled, the resistance of the rotating shaft 100 increases, and the torque transmitted by the rotating hand wheel 400 exceeds the critical value, the tooth root surface of the second crown gear 320 climbs toward the tooth top surface, and the elastic member is further compressed, and the sliding member 300 slides backward along the axial direction until the first crown gear 210 and the second crown gear 320 are disengaged from each other, achieving clutch slippage, thereby avoiding the hand wheel 400 from turning the rotating shaft 100 forcefully, and protecting the transmission components of the sewing machine from damage or displacement.
[0025] In some of the embodiments, the elastic member is a spring 500 , one end of the spring 500 abuts against the first ring 310 , and the other end of the spring 500 abuts against the hand wheel 400 .
[0026] In some embodiments, the first ring body 310 includes an outer ring body 311 and an inner ring body 312 coaxially arranged from outside to inside, and a first side wall 313 connected between the outer ring body 311 and the inner ring body 312, the first side wall 313 is located at the front end of the outer ring body 311 and the inner ring body 312, the inner ring body 312 is clearance-matched with the rotating shaft 100, and one end of the spring 500 is sleeved on the inner ring body 312 and abuts against the first side wall 313. The outer ring body 311, the inner ring body 312, the first side wall 313 and the second crown gear 320 are integrally formed.
[0027] In some of the embodiments, the hand wheel 400 includes a housing 410, a second ring body 420 and a third ring body 430 coaxially arranged from outside to inside, and a second side wall 440 connected between the second ring body 420 and the third ring body 430, the second side wall 440 is located at the rear ends of the second ring body 420 and the third ring body 430, the third ring body 430 is clearance-matched with the rotating shaft 100, and the other end of the spring 500 is sleeved on the third ring body 430 and abuts against the second side wall 440. The housing 410, the second ring body 420, the third ring body 430 and the second side wall 440 are integrally formed.
[0028] In some of the embodiments, a slide groove 314 is provided on the outer wall of the outer ring body 311 , and a slider 421 cooperating with the slide groove 314 is provided on the inner wall of the second ring body 420 .
[0029] In some embodiments, when the first crown gear 210 and the second crown gear 320 are in meshing state, the distance from the bottom of the slide groove 314 to the slider 421 is greater than or equal to the distance the slider 300 needs to slide when the first crown gear 210 and the second crown gear 320 are disengaged from each other.
[0030] In some embodiments, the tooth tops and tooth roots of the gear teeth of the first crown gear 210 and the second crown gear 320 are arc-shaped, the tooth tops are convex arc-shaped, and the tooth roots are concave arc-shaped, so that the overall tooth surface of the gear teeth is wavy.
[0031] In some embodiments, a retaining spring is disposed on the rotating shaft 100, and the retaining spring abuts against a rear end surface of the third ring body 430. In some embodiments, a removable end cover 600 is disposed on a rear end surface of the housing 410.
[0032] In some of the embodiments, the outer diameter of the second crown gear 320 is greater than the outer diameter of the outer ring body 311 .
[0033] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.
Claims
1. A thread jam protection clutch mechanism for a sewing machine, characterized in that: The invention comprises a rotating shaft (100), a gear (200), a sliding member (300) and a hand wheel (400) which are sequentially sleeved on the rotating shaft (100) from front to back, wherein the gear (200) is fixedly connected to the rotating shaft (100), the sliding member (300) and the hand wheel (400) are both clearance-matched with the rotating shaft (100), a first crown gear (210) is fixedly arranged on the rear end face of the gear (200), the first crown gear (210) is coaxially arranged with the gear (200), the sliding member (300) comprises a first ring body (310) and a second crown gear (320) meshing with the first crown gear (210), the second crown gear ( The first ring body (310) and the hand wheel (400) are fixedly arranged at the front end of the first ring body (310) and are coaxially arranged with the first ring body (310). The first ring body (310) and the hand wheel (400) are axially slidably connected. An elastic member for driving the second crown gear (320) to press against the first crown gear (210) is provided between the first ring body (310) and the hand wheel (400). When the first crown gear (210) and the second crown gear (320) are in a meshing state, there is a space between the sliding member (300) and the hand wheel (400) for the sliding member (300) to slide backward until the first crown gear (210) and the second crown gear (320) are separated from each other.
2. The thread jam protection clutch mechanism for a sewing machine according to claim 1, characterized in that: The elastic member is a spring (500), one end of the spring (500) is in contact with the first ring body (310), and the other end of the spring (500) is in contact with the hand wheel (400).
3. The thread jam protection clutch mechanism for a sewing machine according to claim 2, characterized in that: The first ring body (310) comprises an outer ring body (311) and an inner ring body (312) coaxially arranged from outside to inside, and a first side wall (313) connected between the outer ring body (311) and the inner ring body (312), the first side wall (313) is located at the front ends of the outer ring body (311) and the inner ring body (312), the inner ring body (312) is loosely matched with the rotating shaft (100), and one end of the spring (500) is sleeved on the inner ring body (312) and abuts against the first side wall (313).
4. The thread jam protection clutch mechanism for a sewing machine according to claim 3, characterized in that: The hand wheel (400) comprises a housing (410), a second ring body (420) and a third ring body (430) which are coaxially arranged from outside to inside, and a second side wall (440) connected between the second ring body (420) and the third ring body (430), wherein the second side wall (440) is located at the rear ends of the second ring body (420) and the third ring body (430), the third ring body (430) is clearance-matched with the rotating shaft (100), and the other end of the spring (500) is sleeved on the third ring body (430) and abuts against the second side wall (440).
5. The thread jam protection clutch mechanism for a sewing machine according to claim 4, characterized in that: A sliding groove (314) is provided on the outer wall of the outer ring body (311), and a sliding block (421) matching with the sliding groove (314) is provided on the inner wall of the second ring body (420).
6. The thread jam protection clutch mechanism for a sewing machine according to claim 5, characterized in that: When the first crown gear (210) and the second crown gear (320) are in a meshing state, the distance from the bottom of the sliding groove (314) to the sliding block (421) is greater than or equal to the distance required for the sliding member (300) to slide when the first crown gear (210) and the second crown gear (320) are disengaged from each other.
7. The thread jam protection clutch mechanism for a sewing machine according to claim 1, characterized in that: The tooth tops and tooth roots of the gear teeth of the first crown gear (210) and the second crown gear (320) are in arc shape, the tooth tops are in convex arc shape, and the tooth roots are in concave arc shape, so that the overall tooth surface of the gear teeth is wavy.
8. The thread jam protection clutch mechanism for a sewing machine according to claim 4, characterized in that: The rotating shaft (100) is provided with a retaining spring, and the retaining spring abuts against the rear end surface of the third ring body (430).
9. The thread jam protection clutch mechanism for a sewing machine according to claim 4, characterized in that: A detachable end cover (600) is provided on the rear end surface of the housing (410).
10. The thread jam protection clutch mechanism for a sewing machine according to claim 3, characterized in that: The outer diameter of the second crown gear (320) is greater than the outer diameter of the outer ring body (311).