Thread tension lever locking device and embroidery machine

Abstract

The application discloses a thread tension lever locking device, which comprises a driving swing lever, a driven swing lever, an elastic member and a locking structure. The second end of the driving swing lever is driven by an eccentric cam, so that the driving swing lever swings back and forth with the first end as the rotating center. The second end of the driven swing lever is used for driving a thread tension lever, and the driven swing lever can swing with the first end as the rotating center. The elastic member generates elastic force to form an included angle between the driving swing lever and the driven swing lever. The locking structure can be moved, so that when the locking structure is separated from the driven swing lever, the driven swing lever is allowed to swing back and forth synchronously with the driving swing lever; or when the locking structure presses the driven swing lever, the driven swing lever is static while the driving swing lever swings back and forth. The application further discloses an embroidery machine with the thread tension lever locking device. The application has the beneficial effect of preventing the thread tension lever from continuously swinging back and forth when the embroidery is stopped.

Description

TECHNICAL FIELD

[0001] The present application relates to a thread lever locking device and an embroidery machine, and belongs to the technical field of embroidery machines. BACKGROUND

[0002] In the technical field of embroidery machines, a multi-head embroidery machine has multiple heads, which share a main shaft, and the main shaft drives the needle bar of the head to reciprocate up and down and the thread lever to reciprocate swing through a transmission structure. When a head is embroidering, the thread lever of the head reciprocates swing to collect and release the embroidery thread and provide the embroidery thread to the needle at the bottom end of the needle bar, and the needle bar of the head reciprocates up and down to make the needle embroider the embroidery product. When the head stops embroidering and other heads are embroidering, the needle bar of the head can be separated from the transmission structure corresponding thereto, so that the needle bar is stationary, and the thread lever of the head continues to reciprocate swing, which not only easily leads to the relaxation of the embroidery thread, but also causes the thread lever to repeatedly rub against the embroidery thread, thereby causing the embroidery thread to be frayed and even broken. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a thread lever locking device to prevent the thread lever from continuing to reciprocate swing when stopping embroidering.

[0004] The present application is achieved by the following technical solutions.

[0005] A thread lever locking device, comprising:

[0006] a driving swing lever, the second end of which is driven by an eccentric cam to make the driving swing lever reciprocate swing with the first end as the center of rotation;

[0007] a driven swing lever, the second end of which is used to drive the thread lever, and the driven swing lever can swing with the first end as the center of rotation;

[0008] a resilient member, the elastic force of which makes an included angle between the driving swing lever and the driven swing lever;

[0009] a locking structure, which can be moved to allow the driven swing lever to reciprocate swing synchronously with the driving swing lever when the locking structure is separated from the driven swing lever, or to press the driven swing lever to make the driven swing lever stationary when the driving swing lever reciprocates swing.

[0010] As a further improvement of the present application, a rotating shaft is further included, the first end of the driving swing lever can rotate around the main shaft, and the first end of the driven swing lever is fixedly connected to the rotating shaft.

[0011] As a further improvement of the present application, the elastic member is a torsion spring; the torsion spring is sleeved outside the rotating shaft; the torsion spring and the driven swing lever are respectively located on two sides of the driving swing lever; one end of the torsion spring acts on the driving swing lever, and the other end acts on the rotating shaft.

[0012] As a further improvement of the present application, the rotating shaft is rotatably sleeved with a sliding sleeve; the first end of the driving swing lever is sleeved and fixed on the sliding sleeve.

[0013] As a further improvement of the present application, the rotating shaft is rotatably sleeved with a sliding sleeve; the first end of the driving swing lever is sleeved and fixed on the sliding sleeve.

[0014] As a further improvement of the present application, the elastic member is a torsion spring; the torsion spring is sleeved outside the rotating shaft; the torsion spring and the driven swing lever are respectively located on two sides of the driving swing lever; one end of the torsion spring acts on the driving swing lever, and the other end acts on the rotating shaft.

[0015] As a further improvement of the present application, the rotating shaft is rotatably sleeved with a sliding sleeve; the first end of the driving swing lever is sleeved and fixed on the sliding sleeve.

[0016] As a further improvement of the present application, the rotating shaft is rotatably sleeved with a sliding sleeve; the first end of the driving swing lever is sleeved and fixed on the sliding sleeve.

[0017] As a further improvement of the present application, the driving swing lever is provided with a limiting structure; the limiting lever is supported on the driven swing lever, and is used for limiting the maximum included angle formed between the driving swing lever and the driven swing lever.

[0018] As a further improvement of the present application, the driving swing lever is provided with a limiting structure; the limiting structure is supported on the driving swing lever, and is used for limiting the maximum included angle formed between the driving swing lever and the driven swing lever.

[0019] As a further improvement of the present application, the driving mechanism is used for driving the locking structure to be active, so that the locking structure presses the driven swing lever or separates from the driven swing lever.

[0020] As a further improvement of the present application, the driving mechanism comprises a pull rod, a driver and a transmission structure; the pull rod can move along the axial direction of the pull rod under the driving of the driver; the pull rod is provided with a pushing member; the transmission structure is rotatably connected to a shaft, and has two swing arms; one swing arm can be pushed by the pushing member of the pull rod, so that the transmission structure rotates around the shaft; the other swing arm can push the top end of the lifting lever, so that the lifting lever and the locking lever move downward; the lifting lever is sleeved with a reset spring, and is used for resetting the upward movement of the lifting lever.

[0021] An embroidery machine comprising the thread tension lever locking device.

[0022] Advantages of the present application:

[0023] The locking structure separates from the driven swing lever during embroidery, so that the thread tension lever can reciprocate to collect and release the embroidery thread. When embroidery is stopped, the locking structure presses the driven swing lever, so that the driven swing lever does not reciprocate synchronously with the driving swing lever and remains stationary, so that the thread tension lever is stationary, thereby stopping the collection and release of the embroidery thread, avoiding the situation of loose and rubbing embroidery thread. BRIEF DESCRIPTION OF DRAWINGS

[0024] The preferred embodiments of the present application will be described in detail below with the help of the accompanying drawings, which are intended to help understand the purpose and advantages of the present application, in which:

[0025] Figure 1 Structure diagram of the thread tension lever locking device of embodiment 1;

[0026] Figure 2 Side view diagram of the thread tension lever locking device of embodiment 1;

[0027] Figure 3 Top view diagram of the thread tension lever locking device of embodiment 1;

[0028] Figure 4 Structure diagram of the head of the embroidery machine of embodiment 1;

[0029] Figure 5 Structure diagram of the driving mechanism of embodiment 1;

[0030] Figure 6 Structure diagram of the driven swing lever and the thread tension lever of embodiment 1. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below according to the drawings and embodiments.

[0032] In this specification, the orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, and the words "inner" and "outer" refer to the direction towards or away from the geometric center of a particular component, which are relative concepts, so it is possible to change accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0033] Embodiment 1:

[0034] Reference Figures 1-6The application discloses a thread tension lever locking device arranged on a head of an embroidery machine, which comprises a driving swing lever, a driven swing lever, an elastic member and a locking structure.

[0035] The driving swing lever has a first end and a second end, and the second end of the driving swing lever is driven by the eccentric cam so that the driving swing lever reciprocates with the first end as the rotation center. The driven swing lever has a first end and a second end, and the second end of the driven swing lever is used for driving the thread tension lever, and the driven swing lever can swing with the first end as the rotation center.

[0036] The elastic member has elastic deformation and can generate elastic force, and the elastic force generated by the elastic member causes the driving swing lever and the driven swing lever to form an included angle, the driving swing lever is driven by the eccentric cam to reciprocate, and the driven swing lever is synchronously driven to reciprocate under the action of the elastic member, so that the thread tension lever is synchronously driven to reciprocate.

[0037] The head of the embroidery machine comprises a machine shell, a needle bar frame arranged at the front of the machine shell, a main shaft transversely penetrating the side wall of the machine shell, an eccentric cam arranged on the main shaft and a thread tension lever arranged at the upper position of the needle bar frame. The thread tension lever is located above the eccentric cam in space, the driving swing lever and the driven swing lever are transmission assemblies for driving the thread tension lever by the eccentric cam, and the included angle between the two is matched with the spatial layout of the eccentric cam and the thread tension lever.

[0038] It should be noted that the driving swing lever and the driven swing lever can be arranged in a rod-shaped structure or a non-rod-shaped structure, and when the driving swing lever and the driven swing lever are arranged in a non-rod-shaped structure, an obvious included angle is not necessarily formed between the two, so the included angle α described in the embodiment refers to the included angle α formed by the line l1 between the first end and the second end of the driving swing lever and the line l2 between the first end and the second end of the driven swing lever.

[0039] The locking structure can be movable, and the movement of the locking structure can separate the locking structure from the driven swing lever, that is, the driven swing lever can reciprocate synchronously with the driving swing lever, or the locking structure can press the driven swing lever so that the driven swing lever is stationary when the driving swing lever reciprocates.

[0040] The embroidery machine has multiple heads. When the current head is embroidering, the eccentric cam 61 is driven to rotate by the main shaft 6, the driving swing rod 31 and the driven swing rod 32 are synchronously reciprocated, thereby driving the thread lifting rod 21 to reciprocate, the swing of the thread lifting rod 21 can collect and release the embroidery thread, and the embroidery thread is delivered to the needle rod for embroidery, and the needle rod reciprocates up and down for embroidery.

[0041] When the current head stops embroidering and other heads are embroidering, the needle rod of the current head will stop reciprocating up and down, and the main shaft 6 still remains in the state of rotation. If the thread lifting rod 21 of the current head still remains in the state of reciprocating to continuously collect and release the embroidery thread, on the one hand, it will cause the embroidery thread to be loose, thereby affecting the embroidery quality of the current head in the next embroidery, and on the other hand, the reciprocating swing of the thread lifting rod 21 will also cause the thread hole 213 of the thread lifting rod 21 and the embroidery thread to repeatedly rub, thereby causing the embroidery thread to be fuzzy and worn, and even the breakage of the embroidery thread.

[0042] In the embodiment, when the current head stops embroidering, the locking structure is activated and presses the driven swing rod 32, and the second end portion 322 of the driven swing rod 32 is located at the lowest horizontal height. In this process, since the driving swing rod 31 remains reciprocating, the included angle between the driving swing rod 31 and the driven swing rod 32 changes in a sinusoidal manner, so that the elastic force generated by the elastic member 33 on the driven swing rod 32 changes in a sinusoidal manner. Since the locking structure exerts a rigid force on the driven swing rod 32 in the state of pressing the driven swing rod 32, the driven swing rod 32 will not synchronously reciprocate with the driving swing rod 31, and remains in a state of static, so that the thread lifting rod 21 is static, thereby stopping the collection and release of the embroidery thread, and avoiding the occurrence of the conditions of the embroidery thread being loose and rubbing the embroidery thread.

[0043] In the embodiment, the thread lifting rod locking device further comprises a rotating shaft 34, the axial direction of the rotating shaft 34 is parallel to the axial direction of the main shaft 6, the first end portion 311 of the driving swing rod 31 can rotate around the main shaft 6, and the first end portion 321 of the driven swing rod 32 is fixed on the main shaft 6. Two mounting holes 11 are respectively arranged on the left and right sides of the top of the machine shell 1, and the two ends of the rotating shaft 34 are respectively mounted in the corresponding mounting holes 11. The arrangement of the rotating shaft 34 enables the driving swing rod 31 and the driven swing rod 32 to remain in a relatively stable state when swinging, thereby ensuring the stability of the reciprocating action of the thread lifting rod 21. The first end portion 311 of the driving swing rod 31 can be directly rotatably sleeved on the rotating shaft 34, or can be indirectly rotatably sleeved on the rotating shaft 34 through an intermediate part.

[0044] In the embodiment, the elastic member 33 is a torsional spring, the torsional spring is sleeved outside the rotating shaft 34, the torsional spring and the driven swing rod 32 are respectively located on the two sides of the driving swing rod 31, one end of the torsional spring acts on the driving swing rod 31, and the other end acts on the rotating shaft 34.

[0045] It should be noted that the torsion spring is also called torsion spring, and its two ends are its acting end parts. If the driving swing rod 31 and the driven swing rod 32 are directly or indirectly rotationally sleeved on the rotating shaft 34, based on the structural characteristics of the torsion spring, the torsion spring can only be arranged between the driving swing rod 31 and the driven swing rod 32, so that the two ends of the torsion spring act on the driving swing rod 31 and the driven swing rod 32 respectively. In the embodiment, since the first end part of the driven swing rod 32 is fixed on the rotating shaft 34, one end of the torsion spring acts on the rotating shaft 34, that is, on the driven swing rod 32. Therefore, only one of the driving swing rod 31 and the driven swing rod 32 is fixed on the rotating shaft 34, the torsion spring can be arranged on the outside, that is, the torsion spring and the driven swing rod 32 in the embodiment are located on both sides of the driving swing rod 31, so that one end of the torsion spring acts on the driving swing rod 31 and the other end acts on the rotating shaft 34, that is, on the driven swing rod 32.

[0046] First, theoretically, when the driving swing rod 31, the driven swing rod 32 and the thread lifting rod 21 are located in the same vertical plane, the transmission structure driven by the eccentric cam 61 to reciprocate the thread lifting rod 21 has the best stability in operation. However, due to the space layout and collision interference, the driving swing rod 31 and the driven swing rod 32 cannot be arranged in the same vertical plane, so the smaller the distance between the driving swing rod 31 and the driven swing rod 32, the more reliable the stability in operation.

[0047] Secondly, if the elastic force generated by the elastic member 33 is weak, the swing of the driven swing rod 32 will have hysteresis, the synchronous performance of the reciprocating swing of the driven swing rod 32 and the driving swing rod 31 will be poor, the synchronous performance of the thread lifting rod 21 and the needle rod in the embroidery thread winding and unwinding and the reciprocating movement will be poor, which will affect the embroidery and make the reciprocating swing state of the thread lifting rod 21 unstable. Since the elastic member 33 is a torsion spring, the elastic force generated by the torsion of the torsion spring is directly related to the number of turns of the torsion spring. The more the number of turns of the torsion spring, that is, the longer the length of the torsion spring, the stronger the elastic force of the torsion spring; on the contrary, the fewer the number of turns of the torsion spring, that is, the shorter the length of the torsion spring, the weaker the elastic force of the torsion spring.

[0048] If the driving swing rod 31 and the driven swing rod 32 are directly or indirectly rotationally sleeved on the rotating shaft 34, the torsion spring is arranged between the driving swing rod 31 and the driven swing rod 32, the longer the length of the torsion spring, the greater the distance between the driving swing rod 31 and the driven swing rod 32; on the contrary, the shorter the distance between the driving swing rod 31 and the driven swing rod 32, the shorter the length of the torsion spring. That is, the stability of the transmission structure composed of the driving swing rod 31 and the driven swing rod 32 in operation and the strength of the elastic force generated by the elastic member 33 are in a contradictory relationship.

[0049] In the embodiment, the driven swing rod 32 is fixed to the rotating shaft 34, the torsion spring and the driven swing rod 32 are located on the two sides of the driving swing rod 31, the length of the torsion spring and the distance between the driving swing rod 31 and the driven swing rod 32 are not related, and the stability of the transmission structure formed by the driving swing rod 31 and the driven swing rod 32 and the strength of the elastic force generated by the elastic member 33 can be considered. Therefore, in the embodiment, the number of turns of the torsion spring, i.e., the length of the torsion spring, can be set according to the demand for the strength of the elastic force of the torsion spring, and the driving swing rod 31 and the driven swing rod 32 are close to each other, so that the distance between them is small to ensure the stability during operation.

[0050] In the embodiment, the rotating shaft 34 is rotatably sleeved with a sliding sleeve 341, and the first end 311 of the driving swing rod 31 is fixedly sleeved on the sliding sleeve 341, i.e., the first end of the driving swing rod 31 is indirectly rotatably sleeved on the rotating shaft 34, and the sliding sleeve 341 replaces the driving swing rod 31 and the rotating shaft 34 to generate driving friction, thereby playing a role of wear resistance and prolonging the service life. In addition, the portion of the rotating shaft 34 inserted into the two mounting holes 11 can also be rotatably sleeved with a sliding sleeve 342, thereby playing the same role of wear resistance and prolonging the service life.

[0051] In the embodiment, the rotating shaft 34 is provided with an elastic force transmission component 35, one end of the torsion spring acts on the elastic force transmission component 35, i.e., acts on the rotating shaft 34 and the driven swing rod 32, and the elastic force transmission component 35 can adjust the position around the circumference of the rotating shaft 34, so that the one end of the torsion spring acting on the elastic force transmission component 35 is adjusted in position along the circumference of the rotating shaft 34, thereby enabling the elastic force of the torsion spring to be adjusted according to actual application requirements.

[0052] In the embodiment, the driving swing rod 31 is provided with a limiting structure 36, the limiting structure 36 is supported on the driven swing rod 32, the driving swing rod 31 and the driven swing rod 32 interact through the force of the limiting structure 36, and the elastic force of the elastic member 33 on the driving swing rod 31 and the driven swing rod 32 is opposite in direction, thereby being able to limit the maximum included angle formed between the driving swing rod 31 and the driven swing rod 32. The limiting structure 36 can also be provided on the driven swing rod 32 and supported on the driving swing rod 31. In the embodiment, the limiting structure 36 is provided as a bolt mounted on the driving swing rod 31, and can also be provided as other components.

[0053] The locking structure includes a locking rod 41, which can move up and down, so that the locking end 411 at the bottom end can press the driven swing rod 32 or separate from the driven swing rod 32. In the embodiment, the locking structure further includes a lifting rod 42 which can move up and down, and the locking rod 41 is bent and connected to the lifting rod 42, so that the lifting rod 42 is located behind the locking end 411.

[0054] The thread tension lever locking device of the embodiment further comprises a driving mechanism for driving the locking structure to move, so that the locking structure presses or separates from the driven swing lever 32.

[0055] Specifically, in the embodiment, the driving mechanism comprises a pull rod 51, a driver 52 and a transmission structure 53. The pull rod 51 is arranged transversely and can move along its axis under the driving of the driver 52. The pull rod 51 is provided with a pusher 511. The transmission structure 53 is rotatably connected to a shaft and has two swing arms 531 and 532. One of the swing arms 531 can be pushed by the pusher 511 of the pull rod 51, so that the transmission structure 53 rotates around the shaft. The other swing arm 532 can push the top end of the lifting lever 42, so that the lifting lever 42 and the locking lever 41 move downward. The lifting lever 42 is sleeved with a return spring 421. When the swing arm 532 pushes the top end of the lifting lever 42, so that the lifting lever 42 moves downward and the locking end 411 of the locking lever 41 presses the driven swing lever 32, the return spring 421 is in a compressed state. When the swing arm 532 and the top end of the lifting lever 42 are separated, the lifting lever 42 moves upward and returns under the elastic force of the return spring 421, so that the locking end 411 of the locking lever 41 separates from the driven swing lever 32.

[0056] In addition, in the embodiment, the thread tension lever 21 has a first end 211 and a second end 212. The second end 212 has a thread hole 213, so that the embroidery thread can pass through the thread hole 213. The thread tension lever 21 can swing around the first end 211. The embroidery machine head of the embodiment can perform color changing embroidery. The needle bar holder 2 can move transversely left and right relative to the machine housing 1. The needle bar holder 2 is provided with a plurality of thread tension levers 21 arranged at intervals in the left and right directions. The first end 211 of the thread tension lever 21 has a clamping groove structure 214. The second end 322 of the driven swing lever 32 has a clamping structure 323. When the needle bar holder 2 moves transversely left and right relative to the machine housing 1, the clamping structure 323 and the clamping groove structure 214 can separate or be clamped together, that is, the driven swing lever 32 can be connected to or separated from any thread tension lever 21, thereby having the function of color changing.

[0057] Embodiment 2

[0058] A thread tension lever locking device, which is different from embodiment 1 as follows, and the rest is the same as embodiment 1.

[0059] In embodiment 2, the first end of the driving swing lever is fixedly connected to the rotating shaft. The first end of the driven swing lever can rotate around the main shaft. The torsional spring is located on both sides of the driven swing lever. One end of the torsional spring acts on the driven swing lever, and the other end acts on the rotating shaft. The first end of the driven swing lever is sleeved and fixed on the sliding sleeve.

[0060] Embodiment 3

[0061] An embroidery machine comprising a thread tension lever locking device as described in embodiment 1 or embodiment 2.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A line-lifting rod locking device, characterized in that, include: The active swing arm has its second end driven by an eccentric cam, causing the active swing arm to swing back and forth with its first end as the center of rotation. The driven swing arm has a second end used to drive the line-taking lever, and the driven swing arm can swing with its first end as the center of rotation; The elastic element is a torsion spring, and the elastic force it generates causes an angle to be formed between the active rocker arm and the driven rocker arm. A locking structure is provided, which is movable such that when the locking structure and the driven swing arm are separated, the driven swing arm is allowed to reciprocate synchronously with the active swing arm; or, the locking structure is used to press down the driven swing arm, so that the driven swing arm remains stationary when the active swing arm reciprocates. Shaft; The first end of the active pendulum is rotatable around the pivot, the first end of the driven pendulum is fixedly connected to the pivot, the torsion spring is sleeved outside the pivot, the torsion spring and the driven pendulum are respectively located on both sides of the active pendulum, one end of the torsion spring acts on the active pendulum and the other end acts on the pivot; or, the first end of the active pendulum is fixedly connected to the pivot, the first end of the driven pendulum is rotatable around the pivot, the torsion spring is sleeved outside the pivot, the torsion spring and the active pendulum are respectively located on both sides of the driven pendulum, one end of the torsion spring acts on the driven pendulum and the other end acts on the pivot.

2. The line-lifting rod locking device according to claim 1, characterized in that, The rotating shaft is rotatably fitted with a sliding sleeve, and the first end of the active swing rod is fitted and fixed on the sliding sleeve; or, the rotating shaft is rotatably fitted with a sliding sleeve, and the first end of the driven swing rod is fitted and fixed on the sliding sleeve.

3. The line-lifting rod locking device according to claim 1, characterized in that, The rotating shaft is equipped with a spring force transmission component, one end of the torsion spring acts on the spring force transmission component, and the position of the spring force transmission component can be adjusted around the circumference of the rotating shaft.

4. The line-lifting rod locking device according to any one of claims 1-3, characterized in that, The active pendulum has a limiting structure, which is supported on the driven pendulum and is used to limit the maximum included angle between the active pendulum and the driven pendulum.

5. The line-lifting rod locking device according to any one of claims 1-3, characterized in that, The active swing arm has a limiting structure, which is supported on the active swing arm and is used to limit the maximum distance formed between the active swing arm and the driven swing arm. Large angle.

6. The line-lifting rod locking device according to any one of claims 1-3, characterized in that, It also includes a drive mechanism for driving the locking structure to move, such that the locking structure presses against or separates from the driven rocker arm.

7. The line-lifting rod locking device according to claim 6, characterized in that, The driving mechanism includes a pull rod, a driver, and a transmission structure; the pull rod is driven by the driver to move along its own axis, and a pusher is provided on the pull rod; the transmission structure is rotatably connected to a shaft and has two swing arms, one of which can be pushed by the pusher of the pull rod, causing the transmission structure to rotate around the shaft, and the other swing arm can push the top of the lifting rod, causing the lifting rod and the locking rod to move downward; a return spring is sleeved on the lifting rod for resetting when the lifting rod moves upward.

8. An embroidery machine, characterized in that, Includes the line-lifting lever locking device as described in any one of claims 1-7.

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