Upper thread clamping device, machine head and embroidery machine

Abstract

The utility model discloses a surface thread clamping device, comprising: a surface thread clamping fixed seat, movably connected with at least two surface thread clamping members; a first rotating shaft, connected with a first lever; a second lever, having a rotating fulcrum, the first lever and the second lever being transmission-connected; a driving mechanism, used to drive the first rotating shaft to rotate, so that the first lever and the second lever simultaneously drive the two surface thread clamping members to move, so that the two surface thread clamping members and the surface thread clamping fixed seat clamp or release the two surface threads. The utility model also discloses a machine head and an embroidery machine. The beneficial effect of the utility model is that it can be applied to the surface thread clamping needs of double-needle embroidery, and the required installation space is small, which is conducive to space layout.

Description

Technical Field

[0001] The utility model relates to an upper thread clamping device, a machine head and an embroidery machine, belonging to the technical field of embroidery machines. Background Art

[0002] At present, in the embroidery machine industry, in order to improve the efficiency of embroidery, a matching machine head is designed, which can drive two needle bars at the same time for embroidery; at the same time, the needle bars are equipped with a surface thread clamping mechanism, which allows the embroidery thread to pass through the surface thread clamping mechanism when the needle bar is embroidering, and clamps the embroidery thread when the needle bar stops embroidering, so that it cannot continue to transport the embroidery thread downward. For example, the utility model patent with the prior art publication number CN209602790U discloses a surface thread clamping device for an embroidery machine, which can only be used for the clamping of a single surface thread. If it is used in the machine head, two sets of devices are required to meet the demand for surface thread clamping, but it will take up a large installation space, but the space in the machine head is relatively small and cannot meet the requirements. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an upper thread clamping device, a machine head and an embroidery machine, which can be applied to the upper thread clamping needs of double-needle embroidery, and the required installation space is small, which is conducive to space layout.

[0004] The utility model is realized through the following technical solutions.

[0005] A surface thread clamping device, comprising:

[0006] An upper thread clamping fixing seat, movably connected with at least two upper thread clamping members;

[0007] A first rotating shaft connected to a first lever;

[0008] A second lever has a rotation fulcrum, and the first lever is transmission-connected to the second lever;

[0009] The driving mechanism is used to drive the first rotating shaft to rotate, so that the first lever and the second lever simultaneously drive the two upper thread clamping members to move, so that the two upper thread clamping members and the upper thread clamping fixing seat clamp or release the two upper threads.

[0010] As a further improvement of the present invention, the face thread clamping piece has a push rod penetrating the face thread clamping fixed seat, and the axial movement of the push rod causes the face thread clamping piece to be attached to the face thread clamping fixed seat, or to be separated from the face thread clamping fixed seat.

[0011] As a further improvement of the present invention, the top and bottom of the face thread clamping piece both have a bent face thread passing portion, and the two face thread passing portions can be abutted against the top and bottom of the face thread clamping fixing seat to prevent the face thread clamping piece from rotating, and the face thread passing portion has a face thread passing groove for allowing the face thread to pass through.

[0012] As a further improvement of the present invention, the wire passing groove has an opening connected to the edge of the wire passing portion.

[0013] As a further improvement of the present invention, the first lever and the second lever have a pushing portion for pushing the corresponding push rod to move axially so that the face thread clamp and the face thread clamp fixing seat are separated, and the push rod is provided with an elastic reset member for driving the push rod to move axially and reset so that the face thread clamp is attached to the face thread clamp fixing seat.

[0014] As a further improvement of the present invention, the first lever has a transmission connecting groove, and the second lever has a transmission connecting shaft that movably matches the transmission connecting groove; or, the second lever has a transmission connecting groove, and the first lever has a transmission connecting shaft that movably matches the transmission connecting groove.

[0015] As a further improvement of the utility model, the driving mechanism includes a driver, a push rod, and a driving lever, wherein the driver is used to drive the push rod to move axially, and one end of the driving lever is fixedly connected to the first rotating shaft, and the other end is movably connected to the push rod.

[0016] As a further improvement of the present invention, the driver is configured as an electromagnet.

[0017] As a further improvement of the present invention, the push rod is provided with an elastic reset member for driving the push rod to move axially and reset.

[0018] A machine head includes a casing, a needle bar frame, and a surface thread clamping device; the needle bar frame is arranged on the front side of the casing, the surface thread clamping fixing seat is arranged on the needle bar frame, and the first rotating shaft, the first shifting rod, the second shifting rod and the driving mechanism are arranged in the casing.

[0019] As a further improvement of the utility model, it also includes a main shaft with an eccentric cam and two guide rods arranged in the casing, the guide rods are slidably sleeved with a needle bar driver and a presser foot driver, the eccentric cam and the two needle bar drivers are drivingly connected with a needle bar drive connecting rod assembly, which is used to drive the two needle bar drivers to lift and reciprocate, and the needle bar driver and presser foot driver on the same guide rod are drivingly connected with a presser foot connecting rod assembly, which is used to drive the presser foot driver to lift and reciprocate.

[0020] As a further improvement of the present invention, the first lever and / or the second lever are bent and formed with an avoidance groove for avoiding the corresponding guide rod.

[0021] An embroidery machine comprises the machine head.

[0022] Beneficial effects of the utility model:

[0023] When the surface thread clamping device is equipped with only one driving mechanism, it can simultaneously drive two surface thread clamping parts to cooperate with the surface thread clamping fixing seat to clamp or release the double-surface threads at the same time, saving the additional configuration of the driving mechanism, which not only saves costs, but also compresses the installation space of the surface thread clamping device in the machine head, which is beneficial to the space layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following is a detailed description of the preferred implementation examples of the present invention with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0025] Figure 1 is a schematic structural diagram of the upper thread clamping device at a viewing angle;

[0026] Figure 2 is a schematic structural diagram of the upper thread clamping device from another viewing angle;

[0027] Figure 3 It is a schematic diagram of the structure of the first rotating shaft, the pin shaft, the first shifting rod, and the second shifting rod;

[0028] Figure 4 It is a structural schematic diagram of the machine head;

[0029] Figure 5 Schematic diagram of the internal structure of the casing. DETAILED DESCRIPTION

[0030] The utility model is further described in detail below based on the accompanying drawings and implementation cases.

[0031] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0032] Implementation Case 1:

[0033] A surface thread clamping device, referring to Figure 1-3, arranged on the head of the embroidery machine, and used to clamp and lock the double-sided thread at the same time, or to release the double-sided thread at the same time so that double-needle embroidery can be performed. The upper thread clamping device of this embodiment includes an upper thread clamping fixed seat 11, a plurality of upper thread clamping members 12, a first rotating shaft 21, a first lever 23, a second lever 24, and a driving mechanism, wherein the upper thread clamping fixed seat 11 extends in the left-right direction, and a plurality of upper thread clamping members 12 are movably connected to the upper thread clamping fixed seat 11 and are arranged at intervals along its length direction, wherein two upper thread clamping members 12 correspond to the current double-sided thread, i.e., two upper threads, and the head can switch the other two corresponding upper thread clamping members 12 by moving the needle bar frame 102 in the left-right direction. The first rotating shaft 21 is connected to the first lever 23, and the second lever 24 has a rotation fulcrum. The first lever 23 and the second lever 24 are transmission-connected, and the first lever 23 and the second lever 24 correspond to one upper thread clamping member 12 respectively.

[0034] The driving mechanism is used to drive the first rotating shaft 21. Since the first lever 23 and the second lever 24 are connected in transmission, when the driving mechanism drives the first rotating shaft 21 to rotate, the first lever 23 and the second lever 24 simultaneously drive the two corresponding surface thread clamping members 12 to move, so that the two surface thread clamping members 12 and the surface thread clamping fixed seat 11 are fitted together or separated from each other. When the two are fitted together, the corresponding surface thread is clamped, so that the corresponding surface thread is locked when the embroidery is stopped to prevent the surface thread from escaping. When the two are separated, the corresponding surface thread is released, so that the surface thread can continue to be transported downward for embroidery.

[0035] In this embodiment, through the transmission connection between the first lever 23 and the second lever 24, the surface thread clamping device can simultaneously drive the two surface thread clamping members 12 to cooperate with the surface thread clamping fixed seat 11 to clamp or release the double-surface threads at the same time when only one driving mechanism is configured, thereby saving the additional configuration of the driving mechanism, not only saving costs, but also compressing the installation space of the surface thread clamping device in the machine head, which is beneficial to the spatial layout.

[0036] In this embodiment, the face thread clamp 12 has a push rod 13, which extends in the front-to-back direction and passes through the face thread clamp fixing seat 11. The axial movement of the push rod 13 causes the face thread clamp 12 to stick to the face thread clamp fixing seat 11 or to be separated from the face thread clamp fixing seat 11.

[0037] In this embodiment, the upper thread clamping and fixing seat 11 is a plate-like structure extending to the left and right and standing upright, and the upper thread clamping member 12 is a sheet-like structure. The upper thread clamping member 12 has a bent thread passing portion 121 at the top and bottom, and the thread passing portion 121 is a sheet-like structure, bent toward the upper thread clamping and fixing seat 11, and the two thread passing portions 121 can be abutted against the top and bottom of the upper thread clamping and fixing seat 11 to prevent the upper thread clamping member 12 from rotating. Both thread passing parts 121 are provided with thread passing grooves 122, so that the upper thread can pass through the thread passing grooves 122 and be located between the upper thread clamping fixed seat 11 and the upper thread clamping piece 12. The setting of the thread passing grooves 122 can play a role in binding the thread, thereby preventing the upper thread from shaking and affecting the stability and quality of embroidery. In addition, when the upper thread clamping fixed seat 11 and the upper thread clamping piece 12 clamp the upper thread, it can prevent the upper thread from being displaced due to being close to the edge of the upper thread clamping piece 12, thereby posing the risk of the upper thread escaping from the clamping.

[0038] In this embodiment, the wire groove 122 has an opening 123 connected to the edge of the wire groove 122. The surface wire is moved into the wire groove 122 through the opening 123, so that the threading operation can be facilitated.

[0039] In this embodiment, an anti-slip structure is provided on the surface where the face thread clamping fixed seat 11 and the face thread clamping piece 12 are in contact. The anti-slip structure can increase the friction effect, thereby improving the clamping stability of the face thread when the face thread clamping piece 12 is attached to the face thread clamping fixed seat 11 to clamp the face thread. The anti-slip structure can be specifically set to an anti-slip pattern formed on the surface of the face thread clamping fixed seat 11.

[0040] In this embodiment, the first lever 23 and the second lever 24 are separately arranged from the corresponding push rod 13, and the first lever 23 and the second lever 24 both have a pushing portion 2a. Under the driving action of the driving mechanism, the pushing portions 2a of the first lever 23 and the second lever 24 respectively push the corresponding push rod 13 to move axially, and separate the corresponding surface thread clamping member 12 from the surface thread clamping fixed seat 11, so that the surface thread is loosened. The push rod 13 is provided with an elastic reset member 131. The elastic action of the elastic reset member 131 has a movement tendency to drive the push rod 13 to move axially in the opposite direction so that the surface thread clamping member 12 is attached to the surface thread clamping fixed seat 11. When it is necessary to stop embroidery, under the driving action of the driving mechanism, the first lever 23 and the second lever 24 are reset, and the two push rods 13 are axially reset under the action of the corresponding elastic reset member 131, so that the surface thread clamping member 12 and the surface thread clamping fixed seat 11 clamp the surface thread. The elastic reset member 131 can be specifically configured as a compression spring, which is sleeved outside the push rod 13 , with one end thereof connected to the push rod 13 , and the other end thereof supported on the upper thread clamping fixed seat 11 .

[0041] In the present embodiment, the requirements for the loosened state of the face thread are relatively loose, as long as the face thread is in an unconstrained state and can be transported downward, that is to say, there are no strict requirements for the separation distance between the face thread clamping member 12 and the face thread clamping fixed seat 11, while the requirements for the clamped state of the face thread are relatively strict, and any looseness will destroy the clamped state of the face thread, causing the face thread to loosen. Therefore, the elastic reset member 131 is used to complete the clamping of the face thread by the face thread clamping fixed seat 11 and the face thread clamping member 12, which can ensure that the face thread is firmly clamped and fixed without loosening, thereby requiring relatively low accuracy of the driving mechanism.

[0042] In this embodiment, the first lever 23 and the second lever 24 are arranged horizontally and spaced apart in the vertical direction, wherein the first lever 23 has a transmission connection groove 25, and the second lever 24 has a vertically arranged transmission connection shaft 26, which passes through the transmission connection groove 25, thereby realizing the transmission connection between the first lever 23 and the second lever 24, and the aperture of the transmission connection groove 25 is larger than the transmission connection shaft 26, so as to avoid the first lever 23 and the second lever 24 from getting stuck during the swinging process. The transmission connection groove 25 can also be arranged on the second lever 24, and the transmission connection shaft 26 can be arranged on the first lever 23.

[0043] The surface thread clamping device of this embodiment also includes a casing plate 31, which can be connected to the casing or be a part of the casing. The first rotating shaft 21 is the casing plate 31, and the first lever 23 and the second lever 24 are located above the casing plate 31. The casing plate 31 is also connected to a pin shaft 22 as a rotation fulcrum for the second lever 24. In one embodiment, the pin shaft 22 is fixedly connected to the casing plate 31, and the second lever 24 is rotatably connected to the pin shaft 22. In another embodiment, the pin shaft 22 is rotatably connected to the casing plate 31, and the second lever 24 is fixedly connected to the pin shaft 22.

[0044] In this embodiment, a guide sleeve 32 is provided on the outer sleeve of the first rotating shaft 21, and the casing plate 31 is sleeved on the guide sleeve 32 through the mounting hole corresponding to the first rotating shaft 21, so that the casing plate 31 and the guide sleeve 32 form an integral structure to improve the installation stability and firmness of the whole device.

[0045] In this embodiment, the first lever 23 and the second lever 24 are both sleeved with a spacer sleeve 33, so that the first lever 23 and the housing plate 31, the second lever 24 and the housing plate 31 are spaced apart, which can avoid axial displacement of the first lever 23 and the second lever 24 and improve the stability of both.

[0046] In this embodiment, the driving mechanism includes a driver 41, a push rod 42, and a driving lever 43, wherein the driver 41 is used to drive the push rod 42 to move axially, one end of the driving lever 43 is fixedly connected to the first rotating shaft 21, and the other end is movably connected to the push rod 42. Driven by the driver 41, the axial movement of the push rod 42 drives the driving lever 43 to swing, driving the first rotating shaft 21 to rotate and then driving the first lever 23 and the second lever 24 to swing at the same time, so that the pushing parts 2a of the two push the corresponding push rod 13.

[0047] In this embodiment, the driver 41 is configured as an electromagnet, which can instantly generate a magnetic field and attract or repel objects when energized, and the magnetism disappears immediately after power failure. This enables the electromagnet driver 41 to start and stop quickly, and has a simple structure and convenient maintenance, which is suitable for the drive setting of the surface thread clamping device.

[0048] In this embodiment, the push rod 42 is provided with an elastic reset member 421 for driving the push rod 42 to move axially and reset. The elastic reset member 421 is a compression spring sleeved outside the push rod 42 .

[0049] Implementation Case 2:

[0050] A machine head, see Figure 4 , Figure 5 Combined with Figure 1-3 , including a housing 101, a needle bar frame 102, and an upper thread clamping device 100, wherein the upper thread clamping device 100 is as shown in Example 1. The needle bar frame 102 is arranged at the front side of the housing 101, the upper thread clamping fixed seat 11 is arranged on the needle bar frame 102, and the first rotating shaft 21, the pin shaft 22 and the driving mechanism are arranged in the housing 101.

[0051] In this embodiment, the machine head also includes a main shaft 103 with an eccentric cam 104 and two guide rods 105 arranged in the casing 101. The guide rods 105 are slidably sleeved with a needle bar driver 106 and a presser foot driver 107. The eccentric cam 104 and the two needle bar drivers 106 are transmission-connected with a needle bar drive connecting rod assembly 108, which is used to drive the two needle bar drivers 106 to rise and fall and reciprocate. The needle bar driver 106 and the presser foot driver 107 on the same guide rod 105 are transmission-connected with a presser foot connecting rod assembly 109, which is used to drive the presser foot driver 107 to rise and fall and reciprocate.

[0052] In this implementation case, the first lever 23 and / or the second lever 24 are bent and formed with an avoidance groove 2b for avoiding the corresponding guide rod 105 to avoid interference and collision.

[0053] Implementation Case 3:

[0054] An embroidery machine includes a machine head, and the machine head is shown in Implementation Example 2.

[0055] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the implementation cases of the utility model.

Claims

1. A surface thread clamping device, characterized in that: include: An upper thread clamping fixing seat, movably connected with at least two upper thread clamping members; A first rotating shaft connected to a first lever; A second lever has a rotation fulcrum, and the first lever is transmission-connected to the second lever; The driving mechanism is used to drive the first rotating shaft to rotate, so that the first lever and the second lever simultaneously drive the two upper thread clamping members to move, so that the two upper thread clamping members and the upper thread clamping fixing seat clamp or release the two upper threads.

2. The upper thread clamping device according to claim 1, characterized in that: The upper thread clamping piece has a push rod penetrating the upper thread clamping fixed seat, and the axial movement of the push rod makes the upper thread clamping piece stick to the upper thread clamping fixed seat, or separate from the upper thread clamping fixed seat.

3. The upper thread clamping device according to claim 2, characterized in that: The top and bottom of the face thread clamping piece both have a bent face thread passing portion, and the two face thread passing portions can abut against the top and bottom of the face thread clamping fixing seat to prevent the face thread clamping piece from rotating, and the face thread passing portion has a face thread passing groove for allowing the face thread to pass through.

4. The upper thread clamping device according to claim 3, characterized in that: The wire passing groove has an opening connected to the edge of the wire passing portion.

5. The upper thread clamping device according to claim 2, characterized in that: The first lever and the second lever have a pushing portion for pushing the corresponding push rod to move axially so that the face thread clamp and the face thread clamp fixing seat are separated. The push rod is provided with an elastic reset member for driving the push rod to move axially and reset so that the face thread clamp is attached to the face thread clamp fixing seat.

6. The upper thread clamping device according to claim 1, characterized in that: The first lever has a transmission connection groove, and the second lever has a transmission connection shaft that flexibly matches the transmission connection groove; or the second lever has a transmission connection groove, and the first lever has a transmission connection shaft that flexibly matches the transmission connection groove.

7. The upper thread clamping device according to claim 1, characterized in that: The driving mechanism comprises a driver, a push rod and a driving lever. The driver is used to drive the push rod to move axially. One end of the driving lever is fixedly connected to the first rotating shaft, and the other end is movably connected to the push rod.

8. The upper thread clamping device according to claim 7, characterized in that: The driver is configured as an electromagnet.

9. The upper thread clamping device according to claim 8, characterized in that: The push rod is provided with an elastic reset member for driving the push rod to move axially and reset.

10. A machine head, characterized in that: It includes a casing, a needle bar frame, and the surface thread clamping device of any one of claims 1-9; the needle bar frame is arranged on the front side of the casing, the surface thread clamping fixed seat is arranged on the needle bar frame, and the first rotating shaft, the first shifting rod, the second shifting rod, and the driving mechanism are arranged in the casing.

11. The handpiece according to claim 10, characterized in that: It also includes a main shaft with an eccentric cam and two guide rods arranged in the casing, the guide rods are slidably sleeved with a needle bar driver and a presser foot driver, the eccentric cam and the two needle bar drivers are drivingly connected with a needle bar drive connecting rod assembly, which is used to drive the two needle bar drivers to lift and reciprocate, and the needle bar driver and presser foot driver on the same guide rod are drivingly connected with a presser foot connecting rod assembly, which is used to drive the presser foot driver to lift and reciprocate.

12. The handpiece according to claim 11, characterized in that: The first lever and / or the second lever are bent and formed with an avoidance groove for avoiding the corresponding guide rod.

13. An embroidery machine, characterized in that: The nose comprising any one of claims 10-12.

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