CN107059270B - Sewing machine and vibration reduction mechanism thereof - Google Patents

Abstract

The invention relates to a vibration damping mechanism of a sewing machine. The up-and-down reciprocating motion of the needle connecting rod will generate inertial force in the vertical direction, and the left-right reciprocating motion of the looper connecting rod will generate the inertial force in the left-right direction; when the needle connecting rod moves downward, the The inertial force generated by the needle connecting rod has a large vertical downward component, and at this time, the center of mass of the additional balance block is deflected upward, and the additional balance weight will generate a vertical upward component; when the needle connecting rod moves upwards , the inertial force generated by the needle connecting rod has a large vertical upward component, and at this time, the center of mass of the additional balance weight is deflected downward, and the additional balance weight will generate a vertical downward component. It can be seen that the additional balance block can offset the inertial force generated by the original parts of the sewing machine, so the vibration damping mechanism of the sewing machine of the present invention can reduce the vibration and noise of the sewing machine, reduce the wear of the moving parts of the moving parts, and improve the operation. personnel working environment.

Description

A sewing machine and its damping mechanism

technical field

The present invention relates to a sewing machine and its damping mechanism, in particular to an industrial sewing machine and its damping mechanism.

Background technique

Sewing machines are widely used in garment production, fabric, packaging and other processing occasions. With the development of industry, the production efficiency of sewing machines is getting higher and higher, and the sewing speed of sewing machines is also getting higher and higher. There are a large number of moving parts inside industrial sewing machines, and the quality of each moving part is concentrated to its own center of gravity. The position, the center of gravity is also often referred to as the center of mass. When the machine is running at high speed, the position of the above-mentioned mass points in space changes periodically, and due to the fast movement speed, a large inertial force will inevitably be generated; on the one hand, these inertial The force finally acts on the frame through the transmission components (such as connecting rod, crank arm, etc.), which makes the whole machine behave violently; trend, will also increase the vibration of the machine. This kind of vibration will not only produce harsh noise, but also aggravate the wear of the moving parts of the moving parts, affect the working accuracy and reliability of the machine, and cause damage to the physical and mental health of the operator.

SUMMARY OF THE INVENTION

In view of the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a sewing machine and its vibration damping mechanism, which can reduce the vibration of the sewing machine.

In order to achieve the above purpose, the present invention provides a vibration damping mechanism for a sewing machine, which adopts the following technical scheme: a vibration damping mechanism for a sewing machine includes a transmission shaft, a looper connecting rod and a sewing needle connecting rod, and the transmission shaft is perpendicular to the bending The needle connecting rod is sleeved with a drive rocker; when the sewing machine is working, the drive shaft rotates forward or reverse, thereby driving the end of the drive rocker to swing left and right, thereby driving the looper connecting rod to reciprocate left and right; The needle connecting rod reciprocates up and down; the transmission shaft is connected with an additional balance block, when the needle connecting rod moves downward, the center of mass of the additional balance block deflects upward; when the needle connecting rod moves upward, the The center of mass of the additional counterweight is deflected downward.

Preferably, when the looper connecting rod moves to the left, the center of mass of the additional balancing weight is deflected to the right; when the looper connecting rod moves to the right, the center of mass of the additional balancing weight is deflected to the left.

Preferably, the center of mass of the additional balance weight is located on the right side of the shaft center of the transmission shaft, and the center of mass of the additional balance weight is located on the left side of the needle connecting rod.

Preferably, when the needle connecting rod moves down to the lowest point, the included angle between the line connecting the center of mass of the additional balance block and the axis of the transmission shaft and the vertical direction is 35-75 degrees; when When the needle connecting rod moves up to the highest point, the included angle between the line connecting the center of mass of the additional balance block and the shaft center of the transmission shaft and the vertical direction is 0-40 degrees.

Preferably, the transmission shaft is connected to a lower shaft in a transmission connection, the lower shaft is provided with a crankshaft portion, and the crankshaft portion is provided with a first hinge shaft parallel to the lower shaft; the first hinge shaft is hinged with a lower shaft connecting rod, and the lower shaft The lower end of the connecting rod is provided with a spherical hinge hole; a driven rocker is sleeved on the drive shaft, the driven rocker is perpendicular to the drive shaft, and the end of the driven rocker is hinged with the spherical hinge hole Mating spherical hinges.

Preferably, the drive rocker is perpendicular to the transmission shaft, the upper end of the drive rocker is provided with a drive block, the looper connecting rod is also fixed with two stop blocks, and the drive block is located between the two stop blocks between.

Corresponding to the vibration damping mechanism of a sewing machine of the present invention, the present invention also provides a sewing machine, which adopts the following technical solution: a sewing machine, comprising the vibration damping mechanism of the sewing machine described in the above technical solution or any of the preferred technical solutions .

As described above, the vibration damping mechanism of a sewing machine according to the present invention has the following beneficial effects: in the vibration damping mechanism of the sewing machine of the present invention, the up and down reciprocating motion of the needle connecting rod will generate an inertial force in the vertical direction, and the looper connection The left and right reciprocating motion of the rod will generate inertial force in the left and right directions; when the needle connecting rod moves downward, the inertial force generated by the needle connecting rod has a large vertical downward component, and at this time, the center of mass of the additional balance block is upward Deflection, the additional balance weight will generate a vertical upward component; when the needle connecting rod moves upward, the inertial force generated by the needle connecting rod has a larger vertical upward component, and at this time, the center of mass of the additional weight Downward deflection, the additional counterweight will produce a vertically downward component. It can be seen that the additional balance block can offset the inertial force generated by the original parts of the sewing machine, so the vibration damping mechanism of the sewing machine of the present invention can reduce the vibration and noise of the sewing machine, reduce the wear of the moving parts of the moving parts, and improve the operation. personnel working environment.

Description of drawings

Fig. 1 shows the three-dimensional structure schematic diagram of the motion mechanism of the sewing machine and the balance block connected to the motion mechanism;

Fig. 2 shows the front view of the motion mechanism of the sewing machine in Fig. 1 and the balance block connected to the motion mechanism;

Figure 3 shows a schematic diagram of the connection of parts such as the needle connecting rod, the upper shaft connecting rod, the arm and the upper shaft balance block viewed from the direction F in Figure 2;

Figure 4 shows a schematic cross-sectional view at A-A in Figure 2, only showing parts such as the lower shaft connecting rod and the rotating disk;

5 shows a schematic diagram of the connection structure of the upper rotating shaft, the lower shaft connecting rod, the driven rocker, the transmission shaft and the additional balance block viewed from the front view direction in FIG. 2;

FIG. 6 shows a schematic diagram of the connection structure of the looper connecting rod, the driving rocker, the transmission shaft and the additional balance weight viewed from the front view direction in FIG. 2;

7 shows a schematic diagram of the motion mechanism of the sewing machine and the direction of the inertial force generated by the balance block connected to the motion mechanism;

Figure 8 shows a schematic diagram of the parameters of the balance block;

9 shows a schematic phase diagram of the inertia force component in the vertical direction of the whole machine, the upper shaft balance block, the lower shaft balance block, and the additional balance block of the vibration damping structure of a sewing machine of the present invention;

Figure 10 shows the phase schematic diagram of the inertial force component of the whole machine and the upper shaft balance block in the vertical direction;

Figure 11 shows the phase diagram of the inertial force component of the whole machine and the lower shaft balance block in the vertical direction;

Figure 12 shows the phase diagram of the inertial force component of the complete machine and the additional balance weight in the vertical direction;

Fig. 13 shows the phase diagram of the inertial force along the axis of the looper connecting rod of the whole machine and the additional balance weight;

Description of reference numerals

1 Upper hinge 12 Spherical hinge hole

2 Lower hinge 13 Slave rocker

3 Drive shaft 14 Spherical joint

4 Needle connecting rod 15 Actuating rocker

5 Looper connecting rod 16 Drive block

6 Upper shaft balancer 17 Stopper

7 Lower shaft balance weight 18 Upper shaft connecting rod

8 Additional counterweights 19 Sector blocks

9 connecting plate 20 arm

10 The first hinge shaft 21 The second hinge shaft

11 Lower shaft connecting rod

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the implementation of the present invention. Restricted conditions, it does not have technical substantive significance, any structural modification, proportional relationship change or size adjustment, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the present invention. The disclosed technical content must be within the scope of coverage. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relationship thereof, shall also be regarded as the implementable scope of the present invention without substantially changing the technical content.

In the following description of the technical solutions of the embodiments of the present invention, "first" and "second" are only for the convenience of distinguishing the names of each component, and not for limiting the structure or function of each component; " "Forward rotation" and "reverse rotation" are only two opposite rotation directions. "Forward rotation" does not necessarily mean clockwise or counterclockwise rotation, and reverse rotation does not necessarily mean clockwise or counterclockwise rotation.

As shown in Figures 1 and 2, a shock absorption mechanism of a sewing machine of the present invention includes a transmission shaft 3, a looper connecting rod 5 and a sewing needle connecting rod 4, and the transmission shaft 3 is perpendicular to the looper connecting rod 5, The drive shaft 3 is sleeved with a drive rocker 15; when the sewing machine is working, the drive shaft 3 rotates forward or reverse, thereby driving the end of the drive rocker 15 to swing left and right, thereby driving the looper connecting rod 5 to reciprocate left and right; The needle connecting rod 4 reciprocates up and down; an additional balance block 8 is connected to the transmission shaft 3. When the needle connecting rod 4 moves downward, the center of mass of the additional balance block 8 is deflected upward; when the needle is connected When the rod 4 moves upwards, the center of mass of the additional counterweight 8 is deflected downwards. In the vibration damping mechanism of the sewing machine of the present invention, the vertical reciprocating motion of the needle connecting rod will generate inertial force in the vertical direction, and the left and right reciprocating motion of the looper connecting rod will generate inertial force in the left and right directions; when the needle connecting rod moves downward, The inertial force generated by the needle connecting rod has a large vertical downward component, and at this time, the center of mass of the additional balance block is deflected upward, and the additional balance weight will generate a vertical upward component; when the needle connecting rod moves upwards , the inertial force generated by the needle connecting rod has a large vertical upward component, and at this time, the center of mass of the additional balance weight is deflected downward, and the additional balance weight will generate a vertical downward component. It can be seen that the additional balance block can offset the inertial force generated by the original parts of the sewing machine, so the vibration damping mechanism of the sewing machine of the present invention can reduce the vibration and noise of the sewing machine, reduce the wear of the moving parts of the moving parts, and improve the operation. personnel working environment.

As shown in Figures 1 and 2, the sewing machine also includes an upper rotating shaft 1 and a lower rotating shaft 2 that are parallel to each other, a needle connecting rod 4 is connected to the upper rotating shaft 1 in a driving connection, and the lower end of the needle connecting rod 4 is used to install the sewing needle. The connecting rod 4 is perpendicular to the upper rotating shaft 1 and the lower rotating shaft 2, the looper connecting rod 5 is connected with the lower rotating shaft 2 by transmission, the right end of the looper connecting rod 5 is used to install the looper, and the looper connecting rod 5 is parallel to the lower rotating shaft 2. The shaft 3 is used to convert and transmit the rotation of the lower shaft 2 to the looper connecting rod 5 so as to make the looper connecting rod 5 reciprocate left and right. When the sewing machine is working, the upper shaft 1 rotates and drives the needle connecting rod 4 to reciprocate up and down. ; The lower shaft 2 rotates and drives the transmission shaft 3 to rotate forward or reversely, and the transmission shaft 3 reciprocates forward or reverse within a certain angle, thereby driving the looper connecting rod 5 to reciprocate left and right; the needle connecting rod 4 and the looper The connecting rod 5 cooperates with each other to drive the sewing needle and the looper to complete the sewing operation; the upper shaft balance block 6 is connected to the upper shaft 1, the lower shaft balance block 7 is connected to the lower shaft 2, and the transmission shaft 3 is connected to With the additional balance block 8, when the sewing machine is working, the up and down reciprocating motion of the sewing needle connecting rod 4 of the sewing machine will generate inertial force in the vertical direction, and the left and right reciprocating motion of the looper connecting rod 5 will generate inertial force along the axial direction of the looper connecting rod 5; Since the upper shaft 1 is connected with the upper shaft balance block 6 and the lower shaft 2 is connected with the lower shaft balance block 7, the upper shaft balance block 6 rotates with the upper shaft 1 to generate a vertical inertial force, and the lower shaft balance block 7 follows the rotation of the upper shaft 1. The rotation of the lower shaft 2 will generate an inertial force in the vertical direction. According to the actual situation of the inertial force of the sewing machine when the upper shaft balance block 6, the lower shaft balance block 7 and the additional balance weight 8 are not installed, the upper shaft balance block 6 is set on the upper side. The phase angle on the shaft 1 and the phase angle of the lower shaft balance weight 7 on the lower shaft 2 make the direction of the inertial force generated by the needle connecting rod 4 and the direction of the inertial force generated by the upper shaft balance weight 6 and the lower shaft balance weight 7 On the contrary, the inertial force generated by the upper shaft balance weight 6 and the lower shaft balance weight 7 can partially or completely offset the inertial force generated by the needle connecting rod 4; The phase angle of the additional balance weight 8 on the transmission shaft 3 is set according to the actual situation of the inertial force of the block 7 and the additional balance weight 8, so that the direction of the inertial force generated by the looper connecting rod 5 and the inertia generated by the additional balance weight 8 In the opposite direction of force, the inertial force generated by the additional balance weight 8 can partially or completely cancel the inertial force generated by the looper connecting rod 5 . Therefore, the vibration damping mechanism of the sewing machine provided by the present invention can reduce the vibration of the sewing machine, reduce the noise generated by the sewing machine, reduce the mechanical wear of the sewing machine, increase the service life of the sewing machine, and improve the working environment of the operator.

In the vibration damping mechanism of the sewing machine of the present invention, when the needle connecting rod 4 moves downward, the inertial force generated by the original parts of the sewing machine (for example, the needle connecting rod 4) on the frame of the sewing machine is downward, and this When , the center of mass of the upper shaft balance block 6 is higher than the axis of the upper shaft 1; The centrifugal force generated is the same) with an upward component; when the needle connecting rod 4 moves up to the highest point, the inertial force generated by the original parts of the sewing machine on the frame of the sewing machine is upward, at this time, the upper shaft balance block 6 The center of mass is lower than the axis of the upper shaft 1, and the inertial force generated by the upper shaft balance block 6 has a downward component; therefore, the inertial force generated by the upper shaft balance block 6 has a counteracting effect on the inertial force generated by the original parts of the sewing machine. .

In a vibration damping mechanism of a sewing machine of the present invention, the lower rotating shaft 2 is connected to the transmission shaft 3 in a transmission manner, and the rotation of the lower rotating shaft 2 can drive the transmission shaft 3 to rotate forward or reversely within a certain angle range, as a preferred embodiment. 4, O is the rotation axis of the lower shaft 2 in Figure 4, the lower shaft 2 is provided with a connecting plate 9, the connecting plate 9 and the lower rotating shaft 2 are coaxially and fixedly arranged, and the connecting plate 9 is formed by the lower rotating shaft 2. Drive and rotate; the connecting plate 9 is provided with a first hinge shaft 10 parallel to the lower shaft 2; the first hinge shaft 10 is hinged with a lower shaft connecting rod 11, please refer to Figure 4 and Figure 5, the lower shaft connecting rod 11 The lower end is provided with a spherical hinge hole 12; the drive shaft 3 is sleeved with a driven rocker 13, the driven rocker 13 is perpendicular to the transmission shaft 3, and the end of the driven rocker 13 is provided with the spherical surface The hinge hole 12 is hinged to the spherical hinge joint 14, so that the rotation of the lower shaft 2 can drive the upper end of the lower shaft connecting rod 11 to rotate around the axis of the lower shaft 2, and the lower end of the lower shaft connecting rod 11 is hinged with the driven rocker 13 , the lower shaft connecting rod 11 drives the spherical hinge joint 14 of the slave rocker 13 to swing up and down, thereby driving the transmission shaft 3 to rotate forward or reversely (in FIG. 4 , the transmission shaft 3 rotates clockwise or counterclockwise within a certain angle range) . As shown in FIG. 6 , a driving rocker 15 is fixedly connected to the transmission shaft 3 , the driving rocker 15 is perpendicular to the transmission shaft 3 , and a driving block 16 is arranged on the upper end of the driving rocker 15 . Two stop blocks 17 are also fixed, and the drive block 16 is located between the two stop blocks 17. When the transmission shaft 3 rotates forwardly or reversely, it can drive the drive rocker 15 to swing left and right, and the drive rocker 15 is left and right. Swing can make the driving block 16 abut against the left stop block 17 to move the looper connecting rod 5 to the left, or contact the right stop block 17 to move the looper connecting rod 5 to the right, In this way, the looper connecting rod 5 can reciprocate left and right.

In a vibration damping mechanism of a sewing machine of the present invention, the needle connecting rod 4 is connected to the upper rotating shaft 1 in a drive, and the upper rotating shaft 1 rotates to drive the needle connecting rod 4 to reciprocate up and down. As shown in FIG. 3 , the upper rotating shaft 1 is connected with a crank arm 20, the crank arm 20 is hinged with an upper shaft connecting rod 18, and the lower end of the upper shaft connecting rod 18 is hinged on the needle connecting rod 4, so that the upper rotating shaft 1 rotates and drives the crank arm 20 to rotate The crank arm 20 rotates to drive the upper end of the upper shaft connecting rod 18 to rotate around the axis of the upper rotating shaft 1, and the lower end of the upper shaft connecting rod 18 is hinged with the needle connecting rod 4 and drives the needle connecting rod 4 to reciprocate linearly up and down. The upper rotating shaft 1 bears the largest inertial force at the turning arm 20. Since the turning arm 20 itself is not a revolving body structure, the turning arm 20 will generate inertial force and act on the upper rotating shaft 1 when it rotates. When the sewing machine is working, The speed components of the crank arm 20, the upper shaft link 18 and the needle connecting rod 4 along the up-down direction (ie the vertical direction) are relatively large, so the crank arm 20, the upper shaft link 18 and the needle connecting rod 4 produce The inertial force in the vertical direction will act on the upper rotating shaft 1 through the crank arm 20. In order to avoid the inertia force generated by the upper shaft balance block 6 added on the upper rotating shaft 1 and the inertial force of the crank arm 20 acting on the upper rotating shaft 1 The force forms a resultant force that occasionally causes the sewing machine to overturn. The upper shaft balance block 6 should be as close as possible to the crank arm 20. As shown in FIG. 3, the upper shaft balance block 6 is arranged on the crank arm 20. A second hinge shaft 21 is provided, the upper end of the upper shaft connecting rod 18 is hinged on the second hinge shaft 21, the upper shaft balance block 6 and the second hinge shaft 21 are respectively located on both sides of the axis of the upper shaft 1, A sector block 19 is provided on the arm 20 , and the upper shaft balance block 6 is detachably sheathed on the sector block 19 . The sector block 19 on the crank arm 20 itself can play a certain role in balancing the inertial force generated by the crank arm 20, the needle connecting rod 4, the upper shaft connecting rod 18 and other parts.

In the vibration damping mechanism of a sewing machine of the present invention, the upper shaft balance block 6 can be connected with the upper shaft 1 in a detachable connection; of course, the inertial force of the upper shaft 1 can also be considered during the design and installation of the sewing machine. To solve the balance problem, when manufacturing the crank arm 20, the upper shaft balance block 6 and the crank arm 20 are set as an integral structure. Of course, the lower shaft balance block 7 and the lower shaft 2 can be connected in a detachable connection mode, and the lower shaft balance block 7 and the lower shaft 2 can also be set into an integral structure; the additional balance block 8 and the transmission shaft 3 can be connected A detachable connection is used for connection, and the additional balance block 8 and the transmission shaft 3 can also be arranged in an integral structure.

In the vibration damping mechanism of a sewing machine of the present invention, as shown in FIG. 7, when the needle connecting rod 4 moves downward, the lower shaft connecting rod 11 moves downward, the looper connecting rod 5 moves to the left, and the sewing needle The inertia force component in the vertical direction generated by the connecting rod 4 is Fz', and the direction is downward; the inertia force component in the vertical direction generated by the lower shaft connecting rod 11 is Fz", and the direction is downward; The inertia force component in the vertical direction generated by the shaft balance block 6 is F1z, and the direction is upward; the inertia force component in the vertical direction generated by the lower shaft balance block 7 connected to the lower shaft 2 is F2z, and the direction is upward; connected to the transmission shaft 3 The inertial force component in the vertical direction generated by the additional balance weight 8 on the The inertial force components in the vertical direction generated by the needle connecting rod 4 and the lower shaft connecting rod 11 are in opposite directions. Therefore, the inertial force in the vertical direction generated by the upper shaft balance weight 6, the lower shaft balance weight 7 and the additional balance weight 8 is in the opposite direction. The component can offset the vertical inertia force component generated by the needle connecting rod 4 and the lower shaft connecting rod 11. The inertial force component along the left and right directions generated by the looper connecting rod 5 is Fx, and the direction is leftward; The inertial force component along the left-right direction generated by 8 is F3x, and the direction is rightward; therefore, the inertial force component along the left-right direction generated by the additional balance weight 8 can offset the inertial force along the left-right direction generated by the looper connecting rod 5 In order to try to avoid or reduce the inertia force generated by the added balance block and the inertia force generated by the original parts of the sewing machine to form a force couple and cause the sewing machine to overturn, the added balance blocks should be as close as possible. The original parts of the sewing machine that generate large inertial force, in the vibration damping mechanism of the sewing machine of the present invention, the inertial force at the joint of the arm 20 on the upper rotating shaft 1 is relatively large, so the balance block 6 of the upper shaft is as much as possible. The upper shaft balance block 6 can be set on the crank arm 20; the inertial force generated by the lower shaft connecting rod 11 on the lower shaft 2 is relatively large, so the lower shaft balance block 7 should be placed as close as possible to The lower shaft connecting rod 11, in order to take into account the original structure of the sewing machine and the need to install the lower shaft balance block 7, the distance between the center of mass of the lower shaft balance block 7 and the sewing needle in the lower axis direction of the lower shaft 2 The component is 80 to 100 mm, preferably 90 mm; the driving rocker 15 on the transmission shaft 3 toggles the looper connecting rod 5 to reciprocate left and right, and the inertial force generated at the connection between the driving rocker 15 and the transmission shaft 3 is relatively large, so the additional balance weight should be added. 8. As close as possible to the drive rocker 15, in order to take into account the original structure of the sewing machine and the need to install the additional balance block 8, the distance between the center of mass of the additional balance block 8 and the sewing needle along the axis of the transmission shaft 3 is 5. to 20 mm, preferably 10 mm.

In the vibration damping mechanism of a sewing machine of the present invention, as shown in Figure 8, the main parameters of the balance block are the mass m of the balance block (the mass of the balance block can be equivalent to the mass point at the center of mass), the center of mass and the axis of rotation The distance r, the angle θ between the connection line between the center of mass and the rotation axis and the vertical direction; in order to achieve a better balance effect for the whole sewing machine, it is necessary to adjust the balance block 6 of the upper shaft and the balance block of the lower shaft 7. The parameters of the additional balance block 8 are set and limited. Due to the limitation of the structure of the sewing machine itself, the mass and volume of the balance block should not be too large. The upper shaft balance block 6 is installed on the arm 20, and its installation space is large. The relevant parameters of the upper shaft balance block 6 can be set according to actual needs; The installation space of the shaft balance weight 7 and the additional balance weight 8 is relatively limited. The distance is 6 to 10 mm; the mass of the additional balance weight 8 is 160 to 200 grams, and the distance between the center of mass of the additional balance weight 8 and the axis of the lower shaft 2 is 15 to 20 mm; In the specific application of the vibration damping mechanism of the sewing machine, the mass of the lower shaft balance block 7 is 72.6 grams, and the distance between the center of mass of the lower shaft balance block 7 and the axis of the lower shaft 2 is 8.62 mm, and the additional balance weight is 8.62 mm. The mass of 8 is 185.5 grams, and the distance between the center of mass of the lower shaft balancer 7 and the axis of the lower shaft 2 is 17.42 mm. In practical applications, according to the inertial force and inertia moment generated by the original parts of the sewing machine, after optimization and comprehensive calculation, and considering the actual installation space, the upper shaft balance block 6, the lower shaft balance block 7, and the additional balance are calculated. The mass m of the block 8, the distance r between the center of mass and the rotation axis, the angle θ between the connection line between the center of mass and the rotation axis and the vertical direction, and the installation position of the upper shaft balance block 6 on the upper rotation shaft 1 , The installation position of the lower shaft balance block 7 on the lower shaft 2, the installation position of the additional balance block 8 on the transmission shaft 3 and other parameters, the final shape of the mass body should be determined in combination with the actual installation space and assembly process of the machine.

In the vibration damping mechanism of the sewing machine of the present invention, preferably, when the needle connecting rod moves down to the lowest point, the center of mass of the upper shaft balance block is higher than the shaft center of the upper rotating shaft, and the upper shaft balance weight The angle between the connection line between the center of mass and the axis of the upper shaft and the vertical direction is 0-30 degrees; the center of mass of the balance block of the lower shaft is higher than the axis of the lower shaft, and the center of mass of the balance block of the lower shaft is The angle between the connecting line with the axis of the lower rotating shaft and the vertical direction is 0-30 degrees. When the needle connecting rod 4 moves upward to the highest point, the center of mass of the upper shaft balance block 6 is lower than the axis of the upper shaft, and the line connecting the mass center of the upper shaft balance block 6 and the shaft center of the upper shaft 1 The angle between the vertical direction is 0-30 degrees; the center of mass of the lower shaft balance block 7 is lower than the axis of the lower shaft, and the center of mass of the lower shaft balance block 7 and the shaft center of the lower shaft 2 are separated. The angle between the connecting line and the vertical direction is 0-30 degrees. Within the above angle range, the inertial force generated by the upper shaft balance weight 6 and the lower shaft balance weight 7 can be maintained in a substantially opposite direction to the inertial force generated by the original parts of the sewing machine, which can better balance the original parts of the sewing machine. the resulting inertial force.

In the vibration damping mechanism of a sewing machine of the present invention, preferably, the center of mass of the additional balance weight is located on the right side of the shaft center of the transmission shaft, and the center of mass of the additional balance weight is located on the left side of the needle connecting rod; One side of the balance block is the lower shaft connecting rod and the driven rocker, and the other side is the sewing needle connecting rod. The vertical component of the inertial force generated by the additional balance weight can offset the lower shaft connecting rod, the driven rocker and the sewing needle. The vertical component of the inertial force generated by the needle connecting rod, and will not act together with the inertial force generated by the lower shaft connecting rod, the driven rocker and the needle connecting rod to form a turning couple on the sewing machine. When the needle connecting rod 4 moves down to the lowest point, the included angle between the line connecting the center of mass of the additional balance block 8 and the axis of the transmission shaft 3 and the vertical direction is 35-75 degrees, preferably is 55.8 degrees, when the needle connecting rod 4 moves from bottom to top, the looper connecting rod moves from left to right, and the angle between the connection line between the center of mass of the additional balance block 8 and the axis of the transmission shaft and the vertical direction gradually increases. Decrease; when the needle connecting rod 4 moves up to the highest point, the angle between the line connecting the center of mass of the additional balance block 8 and the axis of the transmission shaft 3 and the vertical direction is 0-40 degrees , preferably 22 degrees, when the needle connecting rod moves from top to bottom, the looper connecting rod moves from right to left, and the connecting line between the center of mass of the additional balance block 8 and the axis of the transmission shaft is clamped in the vertical direction. The angle gradually increases. Within the above-mentioned angle range, the inertial force generated by the additional balance block 8 can maintain a substantially opposite direction to the inertial force generated by the original parts of the sewing machine, which can better balance the inertial force generated by the original parts of the sewing machine.

In the vibration damping mechanism of a sewing machine of the present invention, please refer to FIG. 8, preferably, when the needle connecting rod 4 moves down to the lowest point, the center of mass of the upper shaft balance block 6 is in a state of upward deflection, Subsequently, the needle connecting rod 4 starts to move upward, and the angle between the line connecting the center of mass of the upper shaft balance block 6 and the axis of the upper rotating shaft 1 and the vertical direction gradually decreases; when the needle connecting rod 4 When moving up to the highest point, the center of mass of the upper shaft balance block 6 is in a state of downward deflection, and then the needle connecting rod 4 starts to move downward, and the center of mass of the upper shaft balance block 6 is in a state of downward deflection. The angle between the connecting line and the vertical direction gradually decreases. When the lower shaft connecting rod 11 moves down to the lowest point, the needle connecting rod 4 moves downward to the lowest point. At this time, the center of mass of the lower shaft balance block 7 is in a state of upward deflection, and then the lower shaft connecting rod 11 moves downward to the lowest point. Start to move upward, the angle between the connection line between the center of mass of the lower shaft balance block 7 and the axis of the lower shaft 2 and the vertical direction gradually decreases; when the lower shaft connecting rod 11 moves upward to the highest point, the sewing needle The connecting rod 4 moves upward to the highest point. At this time, the center of mass of the lower shaft balance block 7 is in a downward deflection state. Then, the lower shaft connecting rod 11 starts to move downward, and the center of mass of the lower shaft balance block 7 is in a state of downward deflection. The angle between the line connecting the axes of 2 and the vertical direction gradually decreases. When the needle connecting rod 4 moves down to the lowest position, the center of mass of the additional balance weight 8 is deflected to the highest position; then, the needle connecting rod 4 starts to move upward, and the center of mass of the additional balance weight 8 starts to deflect downward; when the needle When the connecting rod 4 moves up to the highest position, the center of mass of the additional balance weight 8 is in the lowest position. When the looper connecting rod 5 moves to the left, the center of mass of the additional balance weight 8 is deflected to the right, and the angle between the line connecting the center of mass of the additional balance weight 8 and the axis of the lower shaft 2 and the vertical direction gradually increases Large; when the looper connecting rod 5 moves to the right, the center of mass of the additional balance weight 8 is deflected to the left, and the angle between the line connecting the center of mass of the additional balance weight 8 and the axis of the lower shaft 2 and the vertical direction slowing shrieking.

By calculating and analyzing the inertial force generated by the relevant parts in the vibration damping mechanism of a sewing machine of the present invention, as shown in FIG. The inertial force generated by the sewing machine of block 8) changes periodically with the rotation of the main shaft of the sewing machine. As shown in Figures 10 to 12, the phases of the inertial forces in the vertical direction generated by the upper shaft balance weight 6, the lower shaft balance weight 7, and the additional balance weight 8 are basically the same and opposite in direction. As shown in Figure 13, the additional balance weight 8. The phase of the inertial force component along the left and right directions generated is basically the same and opposite to the phase of the inertial force component along the left and right directions of the whole machine; in this way, the inertial force in the vertical direction of the part of the whole machine is offset, which reduces the The role of the whole machine vibration. Any one of the upper shaft balance block 6, the lower shaft balance block 7 and the additional balance block 8 in the vibration damping mechanism of the sewing machine of the present invention can reduce the vibration of the whole machine, and they do not conflict with each other. According to actual needs, select single or multiple ones for combined use. The upper shaft balance block 6, the lower shaft balance block 7, and the additional balance block 8 can be used in combination at the same time to achieve the best state.

Corresponding to the vibration damping mechanism for a sewing machine of the present invention, the present invention also provides a sewing machine, a vibration damping mechanism for a sewing machine using the above technical solution or any of the preferred technical solutions.

Based on the technical solutions of the above-mentioned embodiments, a sewing machine and its damping mechanism of the present invention have the following beneficial effects:

1. By adding a balance block on a specific shaft to offset or partially offset the inertial force and inertial moment generated by the moving parts in the existing sewing machine, so as to reduce the vibration and noise of the sewing machine, reduce the mechanical wear of the moving pair of the sewing machine, and improve the The operating environment of the operator;

2. The three balance blocks can be used alone or in combination to reduce the vibration of the whole machine, and they do not conflict with each other. They can be used individually or in combination according to actual needs;

3. Strong operability, no need to change the existing movement mechanism, simple structure and low cost of the balance block.

To sum up, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (6)

1. A vibration damping mechanism for a sewing machine, characterized in that it comprises a drive shaft (3), a looper connecting rod (5) and a sewing needle connecting rod (4), and the drive shaft (3) is perpendicular to the looper connecting rod (5), the drive shaft (3) is sleeved with a drive rocker (15); when the sewing machine is working, the drive shaft (3) rotates forward or reverse, thereby driving the end of the drive rocker (15) to swing left and right , and then drive the looper connecting rod (5) to reciprocate left and right; the needle connecting rod (4) reciprocates up and down; An additional balance block (8) is connected to the transmission shaft (3), and when the needle connecting rod (4) moves downward, the center of mass of the additional balance block (8) is deflected upward; ) when moving upward, the center of mass of the additional balance block (8) is deflected downward; The transmission shaft (3) is connected with the lower shaft (2) in a transmission, and the lower shaft (2) is provided with a crankshaft portion, and the crankshaft portion is provided with a first hinge shaft (10) parallel to the lower shaft (2); A lower shaft connecting rod (11) is hinged on the hinge shaft (10), and a spherical hinge hole (12) is arranged at the lower end of the lower shaft connecting rod (11); a driven rocker (12) is sleeved on the transmission shaft (3). 13), the driven rocker (13) is perpendicular to the transmission shaft (3), and the end of the driven rocker (13) is provided with a spherical hinge joint (14) that is hingedly matched with the spherical hinge hole (12). . 2. The vibration damping mechanism of a sewing machine as claimed in claim 1, characterized in that: when the looper connecting rod (5) moves to the left, the center of mass of the additional balance block (8) is deflected to the right; 5) When moving to the right, the center of mass of the additional counterweight (8) is deflected to the left. 3. The vibration damping mechanism of a sewing machine according to claim 1, wherein the center of mass of the additional balance weight (8) is located on the right side of the axis of the transmission shaft (3), and the center of mass of the additional balance weight (8) On the left side of the needle connecting rod (4). 4. The vibration damping mechanism of sewing machine as claimed in claim 1 is characterized in that: When the needle connecting rod (4) moves down to the lowest point, the included angle between the line connecting the center of mass of the additional balance block (8) and the axis of the transmission shaft (3) and the vertical direction is 35-75 degrees; When the needle connecting rod (4) moves up to the highest point, the angle between the vertical direction and the line connecting the center of mass of the additional balance block (8) and the axis of the transmission shaft (3) is 0 -40 degree. 5. The vibration damping mechanism of a sewing machine according to claim 1, wherein the drive rocker (15) is perpendicular to the transmission shaft (3), and a drive block ( 16), two stop blocks (17) are also fixed on the looper connecting rod (5), and the drive block (16) is located between the two stop blocks (17). 6. A sewing machine, characterized by comprising the vibration damping mechanism of the sewing machine according to any one of claims 1 to 5.

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