Noise reduction dynamic balance mechanism of high-speed embroidery machine head

Abstract

The utility model discloses a noise reduction dynamic balance mechanism of a machine head of a high-speed embroidery machine, the machine head is provided with a main shaft, a cam assembly and a machine needle driving shaft which are in transmission connection, the main shaft is also provided with an eccentric assembly which is symmetrical to the cam assembly, and the eccentric assembly is sequentially in transmission connection with a first link rod, a second link rod and a third link rod. According to the utility model, the eccentric assembly, the first link rod, the second link rod and the third link rod are additionally arranged between the main shaft which rotates and the needle driving shaft which linearly reciprocates, and the eccentric assembly and the cam assembly are reversely and symmetrically arranged on the main shaft, so that the first link rod and the transmission arm always keep deflection movement with the same speed but opposite directions; a relative dynamic balance state can be formed in the transmission mechanism, so that the purposes of reducing the amplitude of a needle driver at the tail end of the mechanism and reducing noise are achieved, the amplitude of a needle arranged on the mechanism is reduced, and the embroidery quality under high-speed operation of a main shaft is improved; the noise reduction piece is arranged at the tail end of the third link rod, so that the noise reduction dynamic balance mechanism can be guided to operate according to a preset deflection path and is prevented from influencing other structural pieces in the machine head.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed embroidery machines, in particular to a noise reduction dynamic balancing mechanism for a head of a high-speed embroidery machine. Background Art

[0002] At present, the head of a high-speed embroidery machine generally includes three parts, namely the traditional embroidery machine head, the presser foot cam and the transmission arm. The three parts cooperate with each other to realize the high-speed rotation of the main shaft and the transmission needle drive to drive the needle to continuously move up and down to pull the embroidery thread smoothly through the embroidery cloth to complete the embroidery action. In this transmission mechanism, the cam output end on the head and the movement direction of the transmission arm are almost always in the same direction and synchronous state. When the main shaft rotates at a high speed, the mechanism is very likely to resonate and generate a lot of noise. The higher the input speed of the main shaft, the greater the noise, the more obvious the vibration of the needle end, and the more obvious its impact on the stability of the embroidery action; but on the other hand, the speed of the main shaft directly affects the embroidery efficiency. Therefore, how to maintain or improve the stability of the needle drive and the needle when the main shaft is running at a high speed has always been the improvement direction of the head of the high-speed embroidery machine. Utility Model Content

[0003] In view of the problems existing in the above-mentioned prior art, the utility model provides a noise-reducing dynamic balancing mechanism for the head of a high-speed embroidery machine, which can form a relative dynamic balance state inside the transmission mechanism, thereby achieving the purpose of reducing the amplitude of the needle driver at the end of the mechanism and absorbing noise.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is as follows:

[0005] A noise reduction dynamic balancing mechanism for a high-speed embroidery machine head, wherein a main shaft is arranged on the head, a cam assembly is sleeved on the main shaft, the lower end of the cam assembly is hinged to a transmission arm, the transmission arm is hinged to a needle driver, the needle driver is slidably connected to a vertical shaft mounted on the head, and the main shaft can drive the needle driver to slide back and forth along the vertical shaft during rotation; the noise reduction dynamic balancing mechanism is arranged between the main shaft and the needle drive shaft, and includes an eccentric assembly, a first connecting rod, a second connecting rod and a third connecting rod, wherein:

[0006] The eccentric assembly has a similar structure to the cam assembly, and both include an eccentric wheel and a transmission ring connected thereto in transmission. Each of the eccentric wheels is sleeved on the main shaft and connected thereto in transmission. One end of each of the transmission rings extends to the outside of the eccentric wheel and is connected thereto in transmission. The two eccentric wheels on the cam assembly and the eccentric assembly are symmetrically arranged relative to the main shaft.

[0007] The first link is a triangular structure, and its three ends are respectively hinged with a first pin, a second pin and a third pin, the first pin is hinged with the transmission ring, and the second pin passes through the transmission arm and is hinged with the machine head;

[0008] The second connecting rod is a straight rod or a bent structure, one end of which is hinged to the third pin shaft, and the other end of which is hinged to the third connecting rod;

[0009] The third link is a V-shaped structure, wherein the middle part is hinged to the machine head, one end part is hinged to the second link, and the other end part is hinged to a silencer, and the silencer is arranged outside the side of the vertical axis away from the main axis.

[0010] As a further elaboration of the above technical solution:

[0011] In the above technical solution, a fourth connecting rod is further provided between the transmission arm and the needle driver. The fourth connecting rod is a straight rod or a bent structure, one end of which is hinged to the transmission arm, and the other end is hinged to the needle driver.

[0012] In the above technical solution, the transmission arm is a straight rod or a bent structure, one end of which is sleeved on the second pin shaft and hinged thereto, the middle part of which is hinged to the transmission ring on the cam assembly, and the other end of which is hinged to the fourth connecting rod.

[0013] In the above technical solution, each of the eccentric wheels includes a disc-shaped body and an eccentric sleeve which are fixedly connected, and their central axes are parallel to each other. Each of the eccentric sleeves axially penetrates the disc-shaped body and is adapted to the main shaft, and its two ends extend to the outside of the disc-shaped body respectively.

[0014] In the above technical solution, at least one pair of weight-reducing grooves are symmetrically provided on each of the disc-shaped bodies on the outer side of the eccentric sleeve.

[0015] In the above technical solution, an outer wall of one end of at least one of the eccentric sleeves is provided with an axially extending first groove and a circumferentially extending second groove, and a locking ring is provided on the eccentric sleeve at the periphery and / or side of the first groove and the second groove.

[0016] In the above technical solution, each of the transmission rings includes a transmission part and a connecting part, each of the transmission parts is sleeved on the periphery of a disc-shaped body and slidably connected thereto, and the connecting parts extend to the side of the transmission arm or the first connecting rod and are hinged thereto.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: by adding an eccentric assembly, a first connecting rod, a second connecting rod and a third connecting rod to the main shaft, and installing the eccentric assembly and the cam assembly for moving the transmission needle driver on the main shaft in an anti-symmetrical manner, so that the first connecting rod and the transmission arm always maintain a swaying motion at the same speed but in opposite directions, a relative dynamic balance state can be formed inside the transmission mechanism, thereby achieving the purpose of reducing the amplitude of the needle driver at the end of the mechanism and reducing noise, and further reducing the amplitude of the needle installed thereon, thereby improving the embroidery quality under high-speed operation of the main shaft; by setting the fourth connecting rod, the radial thrust applied by the transmission arm to the needle driver can be absorbed or slowed down, further slowing down the vibration of the needle driver; by setting a silencer at the end of the third connecting rod, the noise reduction dynamic balancing mechanism can be guided to operate according to a preset swaying path and avoid affecting other structural parts in the machine head. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of this embodiment;

[0019] Figure 2 Schematic diagram of the structure in the nose of this embodiment;

[0020] Figure 3 yes Figure 2 A schematic diagram of the structure from another perspective;

[0021] Figure 4 Schematic diagram of the exploded structure of the eccentric assembly in this embodiment.

[0022] In the figure: 10, machine head; 20, main shaft; 30, cam assembly; 40, transmission arm; 50, vertical axis; 60, eccentric assembly; 70, first connecting rod; 80, second connecting rod; 90, third connecting rod; 100, silencer; 110, fourth connecting rod; 120, needle driver; 1, eccentric wheel; 101, disc-shaped body; 102, eccentric sleeve; 2, transmission ring; 201, transmission part; 202, connecting part; 3, locking ring; 4, first pin shaft; 5, second pin shaft; 6, third pin shaft; 7, weight reduction groove; 8, first cutting groove; 9, second cutting groove. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and cannot be understood as limiting the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "several" and "multiple" mean two or more, unless otherwise clearly and specifically defined. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In this application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature can include the first and second features being in direct contact, or it can include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] like Figure 1-3As shown, a noise reduction dynamic balancing mechanism of a high-speed embroidery machine head, a main shaft 20 is provided on the head 10, a cam assembly 30 is sleeved on the main shaft 20, the lower end of the cam assembly 30 is hinged with a transmission arm 40, the transmission arm 40 is hinged with a needle driver 120, the needle driver 120 is slidably connected with a vertical shaft 50 mounted on the head 10, and the main shaft 20 can drive the needle driver 120 to slide back and forth along the vertical shaft 50 during rotation; the noise reduction dynamic balancing mechanism is arranged between the main shaft 20 and the needle drive shaft 50, including an eccentric assembly 60, a first link 70, a second link 80 and a third link 90, wherein:

[0026] The eccentric assembly 60 has a similar structure to the cam assembly 30, and both include an eccentric wheel 1 and a transmission ring 2 connected thereto in transmission. Each eccentric wheel 1 is sleeved on the main shaft 20 and connected thereto in transmission. One end of each transmission ring 2 extends to the outside of the eccentric wheel 1 and is connected thereto in transmission. The two eccentric wheels 1 on the cam assembly 30 and the eccentric assembly 60 are symmetrically arranged relative to the main shaft 20.

[0027] The first link 70 is a triangular structure, and its three ends are respectively hinged with a first pin 4, a second pin 5 and a third pin 6, the first pin 4 is hinged with the transmission ring 2, and the second pin 5 passes through the transmission arm 40 and is hinged with the machine head 10;

[0028] The second link 80 is a straight rod or a bent structure, one end of which is hinged to the third pin 6, and the other end of which is hinged to the third link 90;

[0029] The third link 90 is a V-shaped structure, wherein the middle part is hinged to the machine head 10 , one end part is hinged to the second link 80 , and the other end part is hinged to a silencer 100 , which is arranged outside the side of the vertical axis 50 away from the main axis 20 .

[0030] like Figure 2-3 As shown, a fourth connecting rod 110 is further provided between the transmission arm 40 and the needle driving shaft 50 . The fourth connecting rod 110 is a straight rod or a bent structure, one end of which is hinged to the transmission arm 40 , and the other end of which is hinged to the needle driver 120 .

[0031] It can be understood that the fourth connecting rod 110 hinged between the transmission arm 40 and the needle driver 120 can further buffer the linear reciprocating movement of the needle driver 120, absorb or weaken the radial thrust applied by the transmission arm 40 to the needle driver 120 and the vertical shaft 50, and reduce the radial runout and amplitude of the needle driver 120 during the sliding process.

[0032] like Figure 3 As shown, the transmission arm 40 is a straight rod or a bent structure, one end of which is sleeved on the second pin 5 and hinged thereto, the middle of which is hinged to the transmission ring 2 on the cam assembly 30 , and the other end of which is hinged to the fourth link rod 110 .

[0033] like Figure 4 As shown, each eccentric wheel 1 includes a disc-shaped body 101 and an eccentric shaft sleeve 102 which are fixedly connected, and their central axes are parallel to each other. Each eccentric shaft sleeve 102 axially penetrates the disc-shaped body 101 and is adapted to the main shaft 20, and its two ends extend to the outside of the disc-shaped body 101 respectively; each transmission ring 2 includes a transmission part 201 and a connecting part 202, and each transmission part 201 is matched and sleeved on the periphery of a disc-shaped body 101 and is slidably connected thereto, and the connecting part 202 extends to the side of the transmission arm 40 or the first connecting rod 70 and is hinged thereto.

[0034] In this embodiment, at least one pair of weight-reducing grooves 7 are symmetrically provided on the outer side of the eccentric sleeve 102 on each disc-shaped body 101, and an axially extending first groove 8 and a circumferentially extending second groove 9 are provided on the outer wall of one end of the eccentric sleeve 102 on the cam assembly 30, and a locking ring 3 is provided on the eccentric sleeve 102 at the periphery and / or side of the first groove 8 and the second groove 9. The setting of the weight-reducing groove 7 can reduce the centrifugal force generated during the rotation of the eccentric wheel 1 by reducing the weight thereof, reduce the radial runout amplitude of the eccentric assembly 60 and the first connecting rod 70, and increase the overall stability of the mechanism; the first groove 8 and the second groove 9 can cooperate to form a cantilever-like structure at one end of the eccentric sleeve 102, so as to facilitate the eccentric sleeve 102 to be mounted on the main shaft 20, and the locking ring 3 can lock the eccentric sleeve 102 on the main shaft 20 after assembly, so as to ensure that the two maintain synchronous movement during the rotation process. In application, the groove and the locking ring 3 can be provided on the eccentric sleeve 102 of the eccentric assembly 60 according to the actual structural layout in the machine head and the convenience of assembly.

[0035] During operation, the main shaft 20 drives the cam assembly 30 and the eccentric assembly 60 to rotate synchronously, and the two symmetrically arranged eccentric wheels 1 are driven by the main shaft 20 to rotate. On the one hand, the eccentric wheel 1 on the cam assembly 30 drives the transmission arm 40 to push the fourth connecting rod 110 to pull the needle driver 120 to move back and forth along the vertical axis 50 in a straight line. On the other hand, the eccentric wheel 1 on the eccentric assembly 60 pulls the third connecting rod 90 to move back and forth through the first connecting rod 70 and the second connecting rod 80 in sequence. Since the two eccentric wheels 1 are symmetrically arranged, their eccentric directions relative to the main shaft 20 are opposite, and they are driven by the main shaft 20 to perform an up and down staggered reciprocating pendulum, so that the transmission arm 40 and the first connecting rod 70 respectively connected thereto have opposite pendulum directions. The two cooperate to achieve dynamic balance inside the mechanism, thereby achieving the purpose of reducing the vibration of the needle driver 120 at the end of the transmission mechanism and reducing noise. In addition, the silencer 100 at the end of the noise reduction dynamic balancing mechanism is arranged on the outside of the needle drive shaft 50, and its swing angle cooperates with the presser foot movement, thereby slowing down the vibration of the presser foot and reducing noise.

[0036] The utility model installs an eccentric assembly 60, a first link 70, a second link 80 and a third link 90 on the main shaft 20, and symmetrically installs the eccentric assembly 60 and the cam assembly 30 for moving the transmission needle driver 120 on the main shaft 20 in the opposite direction, so that the first link 70 and the transmission arm 40 always maintain a swaying motion at the same speed but in opposite directions, and a relative dynamic balance state can be formed inside the transmission mechanism, thereby achieving the purpose of slowing down the amplitude of the needle driver 120 at the end of the mechanism and reducing the noise, and further slowing down the amplitude of the needle installed thereon, thereby improving the embroidery quality under high-speed operation of the main shaft; by setting the fourth link 110, the radial thrust applied by the transmission arm 40 to the needle driver 120 can be absorbed or slowed down, and the vibration of the needle driver 120 can be further slowed down; by setting the silencer 100 at the end of the third link 90, the noise reduction dynamic balancing mechanism can be guided to operate according to a preset swaying path and avoid its influence on other structural parts in the machine head 10.

[0037] The cam assembly 30 and the eccentric assembly 60 can convert circular motion into linear reciprocating motion. Their working principles and transmission relationships are common knowledge for those skilled in the art, and their specific structures and connection relationships are not described in detail here.

[0038] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A noise reduction dynamic balancing mechanism for a high-speed embroidery machine head, wherein a main shaft is arranged on the head, a cam assembly is sleeved on the main shaft, the lower end of the cam assembly is hinged to a transmission arm, the transmission arm is hinged to a needle driver, the needle driver is slidably connected to a vertical shaft mounted on the head, and the main shaft can drive the needle driver to slide back and forth along the vertical shaft during rotation; characterized in that: The noise reduction dynamic balancing mechanism is arranged between the main shaft and the needle drive shaft, and includes an eccentric assembly, a first connecting rod, a second connecting rod and a third connecting rod, wherein: The eccentric assembly has a similar structure to the cam assembly, and both include an eccentric wheel and a transmission ring connected thereto in transmission. Each of the eccentric wheels is sleeved on the main shaft and connected thereto in transmission. One end of each of the transmission rings extends to the outside of the eccentric wheel and is connected thereto in transmission. The two eccentric wheels on the cam assembly and the eccentric assembly are symmetrically arranged relative to the main shaft. The first link is a triangular structure, and its three ends are respectively hinged with a first pin, a second pin and a third pin, the first pin is hinged with the transmission ring, and the second pin passes through the transmission arm and is hinged with the machine head; The second connecting rod is a straight rod or a bent structure, one end of which is hinged to the third pin shaft, and the other end of which is hinged to the third connecting rod; The third link is a V-shaped structure, wherein the middle part is hinged to the machine head, one end part is hinged to the second link, and the other end part is hinged to a silencer, and the silencer is arranged outside the side of the vertical axis away from the main axis.

2. The noise reduction dynamic balancing mechanism of a high-speed embroidery machine head according to claim 1, characterized in that: A fourth connecting rod is also provided between the transmission arm and the needle driver. The fourth connecting rod is a straight rod or a bent structure, one end of which is hinged to the transmission arm, and the other end of which is hinged to the needle driver.

3. The noise reduction dynamic balancing mechanism of the high-speed embroidery machine head according to claim 2 is characterized in that: The transmission arm is a straight rod or a bent structure, one end of which is sleeved on the second pin shaft and hinged thereto, the middle part of which is hinged to the transmission ring on the cam assembly, and the other end of which is hinged to the fourth connecting rod.

4. A noise reduction dynamic balancing mechanism for a high-speed embroidery machine head according to any one of claims 1 to 3, characterized in that: Each of the eccentric wheels comprises a disc-shaped body and an eccentric sleeve which are fixedly connected, and their central axes are parallel to each other. The eccentric sleeve axially penetrates the disc-shaped body and is adapted to the main shaft, and its two ends extend to the outside of the disc-shaped body respectively.

5. The noise reduction dynamic balancing mechanism of the high-speed embroidery machine head according to claim 4, characterized in that: Each of the disc-shaped bodies is symmetrically provided with at least one pair of weight-reducing grooves on the outer side of the eccentric sleeve.

6. The noise reduction dynamic balancing mechanism of the high-speed embroidery machine head according to claim 4, characterized in that: An axially extending first groove and a circumferentially extending second groove are provided on the outer wall of one end of at least one of the eccentric sleeves, and a locking ring is provided on the eccentric sleeve at the periphery and / or side of the first groove and the second groove.

7. The noise reduction dynamic balancing mechanism of the high-speed embroidery machine head according to claim 4, characterized in that: Each of the transmission rings comprises a transmission part and a connection part. Each of the transmission parts is sleeved on the periphery of a disc-shaped body and slidably connected thereto. The connection parts extend to the side of the transmission arm or the first connecting rod and are hinged thereto.

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