CN106854798B - Sewing machine and vibration damper thereof - Google Patents
Sewing machine and vibration damper thereof Download PDFInfo
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- CN106854798B CN106854798B CN201611235828.0A CN201611235828A CN106854798B CN 106854798 B CN106854798 B CN 106854798B CN 201611235828 A CN201611235828 A CN 201611235828A CN 106854798 B CN106854798 B CN 106854798B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/14—Needle-bar drives
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
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Abstract
The invention relates to a vibration damper of a sewing machine, when the sewing machine works, a lower rotating shaft rotates to drive a lower shaft connecting rod to move up and down, the lower shaft connecting rod moves up and down to generate vertical inertial force and act on the lower rotating shaft and finally be born by a frame of the sewing machine, and because a lower shaft balance block is connected to the lower rotating shaft, the direction of the inertial force generated by the lower periphery balance block is opposite to the direction of the inertial force generated by the original parts of the sewing machine; therefore, the inertia force generated by the lower shaft balance block can offset the inertia force of the lower shaft connecting rod acting on the lower rotating shaft, thereby reducing the vibration and noise of the sewing machine, reducing the abrasion of the moving pair of the moving part and improving the operating environment of operators.
Description
Technical Field
The invention relates to a sewing machine and a vibration damper thereof, in particular to an industrial sewing machine and a vibration damper thereof.
Background
The sewing machine is widely applied to processing occasions such as clothing production, cloth art, packaging and the like. Along with the development of industry, the production efficiency of a sewing machine is higher and higher, the sewing speed of the sewing machine is also higher and higher, a large number of moving parts exist in the industrial sewing machine, the mass of each moving part is concentrated at the position of the gravity center of each moving part, the gravity center is also often called as the mass center, when the machine runs at a high speed, the position of the mass points on the space is periodically changed, and a large inertia force is inevitably generated due to the high moving speed; on one hand, the inertia forces finally act on the rack through transmission parts (such as connecting rods, crank arms and the like), so that the whole machine is in violent vibration; on the other hand, these inertia forces will simultaneously form a couple, i.e. an inertia moment, which tends to overturn the machine, also increasing the vibrations of the machine. The vibration not only can generate harsh noise, but also can aggravate the abrasion of a moving pair of a moving part, influence the working precision and reliability of a machine and cause damage to the physical and psychological health of an operator.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a sewing machine and a vibration damping device thereof, which can reduce the vibration of the sewing machine.
In order to achieve the purpose, the invention provides a vibration damper of a sewing machine, which adopts the following technical scheme: a vibration damper of a sewing machine comprises a lower rotating shaft, a transmission shaft and a curved needle connecting rod, wherein the curved needle connecting rod is parallel to the lower rotating shaft, the transmission shaft is perpendicular to the curved needle connecting rod and the lower rotating shaft, a connecting disc is arranged on the lower rotating shaft, a lower shaft connecting rod is hinged on the connecting disc and is in transmission connection with the transmission shaft, and the transmission shaft is in transmission connection with the curved needle connecting rod; when the sewing machine works, the lower rotating shaft rotates to drive the lower shaft connecting rod to move up and down, so that the transmission shaft is driven to rotate forwards or backwards, and the curved needle connecting rod is driven to move left and right in a reciprocating manner; the lower rotating shaft is connected with a lower shaft balance block, and when the lower shaft connecting rod moves downwards to the lowest point, the mass center of the lower shaft balance block is higher than the axis of the lower rotating shaft; when the lower shaft connecting rod moves upwards to the highest point, the mass center of the lower shaft balance block is lower than the axis of the lower rotating shaft.
Preferably, when the lower shaft connecting rod moves downwards to the lowest point, the mass center of the lower shaft balancing block is in an upward deflection state; when the lower shaft connecting rod moves upwards to the highest point, the mass center of the lower shaft balance block is in a downward deflection state.
Preferably, when the lower shaft connecting rod moves downwards to the lowest point, the mass center of the lower shaft balance block is higher than the axis of the lower rotating shaft, and the included angle between the connecting line between the mass center of the lower shaft balance block and the axis of the lower rotating shaft and the vertical direction is 0-30 degrees.
Preferably, when the lower shaft connecting rod moves upwards to the highest point, the mass center of the lower shaft balance block is lower than the axis of the lower rotating shaft, and the included angle between the connecting line between the mass center of the lower shaft balance block and the axis of the lower rotating shaft and the vertical direction is 0-30 degrees.
Preferably, a section of first articulated shaft parallel to the lower articulated shaft is arranged on the connecting disc; the lower shaft connecting rod is hinged on the first hinged shaft, and the lower end of the lower shaft connecting rod is provided with a spherical hinged hole; the transmission shaft is sleeved with a driven rocker, the driven rocker is perpendicular to the transmission shaft, and the end part of the driven rocker is provided with a spherical hinge joint in hinged fit with the spherical hinge hole; the transmission shaft is fixedly connected with a driving rocker, the driving rocker is perpendicular to the transmission shaft, the end part of the driving rocker is provided with a driving block, the curved needle connecting rod is also fixedly provided with two stop blocks, and the driving block is positioned between the two stop blocks; the transmission shaft rotates forwards or reversely to drive the end part of the driven rocker to swing up and down and drive the end part of the rocker to swing left and right.
Preferably, the lower shaft balance weight is detachably connected to the lower rotating shaft.
Preferably, the sewing machine further comprises a sewing needle connecting rod which moves up and down, the sewing needle connecting rod is perpendicular to the lower rotating shaft, and when the sewing needle connecting rod moves down to the lowest point, the center of mass of the lower shaft balance block is higher than the axis center of the lower rotating shaft; when the needle connecting rod moves upwards to the highest point, the mass center of the lower shaft balance block is lower than the axis of the lower rotating shaft.
More preferably, the lower axle balance weight has a mass of 70 to 75 g, and the distance between the center of mass of the lower axle balance weight and the axis of the lower axle is 6 to 10 mm.
More preferably, when the needle connecting rod moves downwards to the lowest point, the mass center of the lower shaft balance weight is in an upward deflection state.
Corresponding to the vibration damper of the sewing machine, the invention also provides the sewing machine, which adopts the following technical scheme: a sewing machine comprising the vibration damping device of the sewing machine according to the above or any preferred claim thereof.
As described above, the vibration damping device of the sewing machine according to the present invention has the following advantageous effects: according to the vibration damper of the sewing machine, when the sewing machine works, the lower rotating shaft rotates to drive the lower shaft connecting rod to move up and down, the lower shaft connecting rod moves up and down to generate vertical inertial force and acts on the lower rotating shaft and is finally borne by a frame of the sewing machine, and the lower rotating shaft is connected with the lower shaft balance block; when the lower shaft connecting rod moves upwards to the highest point, the inertia force generated by the lower shaft connecting rod has a larger vertical upward component, at the moment, the mass center of the lower shaft balance block is lower than the axis of the lower rotating shaft, and the inertia force generated by the lower shaft balance block has a vertical downward component; therefore, the inertia force generated by the lower shaft balance block can offset the inertia force of the lower shaft connecting rod acting on the lower rotating shaft, thereby reducing the vibration and noise of the sewing machine, reducing the abrasion of the moving pair of the moving part and improving the operating environment of operators.
Drawings
FIG. 1 is a schematic perspective view of a motion mechanism and a counterbalance attached to the motion mechanism of a sewing machine;
FIG. 2 is a front view of the motion mechanism and a counterbalance attached to the motion mechanism of the sewing machine of FIG. 1;
FIG. 3 is a schematic view of the connection of the needle connecting rod, the upper shaft connecting rod, the crank arm and the upper shaft balance weight as viewed from direction F in FIG. 1;
FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 1, showing only the lower shaft link, the rotary plate, and other components;
fig. 5 is a schematic view showing a connection structure of the upper shaft, the lower shaft link, the driven rocker, the transmission shaft, and the additional weight, as viewed from the front direction in fig. 1;
fig. 6 is a schematic view showing a connection structure of the looper connecting rod, the driving rocker, the transmission shaft, and the additional weight as viewed from the front in fig. 2;
FIG. 7 is a schematic view showing the direction of the inertial force generated by the moving mechanism of the sewing machine and the balance weight connected to the moving mechanism;
FIG. 8 is a parameter diagram of a balance weight;
FIG. 9 is a schematic phase diagram showing the components of the inertial force in the vertical direction of the whole machine, the upper shaft balance weight, the lower shaft balance weight and the additional balance weight of the vibration damping device of the sewing machine according to the present invention;
FIG. 10 is a schematic phase diagram showing the vertical inertial force component of the complete machine and the upper shaft balance weight;
FIG. 11 is a schematic phase diagram showing the vertical inertial force component of the balance weight of the whole machine and the lower shaft;
FIG. 12 is a schematic phase diagram showing the vertical inertial force component of the entire machine and the additional balance weight;
FIG. 13 is a schematic phase diagram showing the inertial force of the whole machine and the additional balance weight along the axial direction of the curved needle connecting rod;
description of the reference numerals
1 upper rotating shaft 12 spherical hinge hole
2 lower rotating shaft 13 driven rocker
3 transmission shaft 14 spherical joint
4 stitch connecting rod 15 driving rocker
5 curved needle connecting rod 16 driving block
6 upper shaft balance weight 17 stop block
7 lower shaft balance block 18 upper shaft connecting rod
8 additional balance weight 19 sector
9 connecting disc 20 crank arm
10 first articulated shaft 21 second articulated shaft
11 lower shaft connecting rod
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
In the following description of the embodiments of the present invention, "first" and "second" are merely for convenience of distinguishing the names of the respective components, and are not intended to limit the structures or functions of the respective components; the "forward rotation" and the "reverse rotation" are only two opposite rotation directions, and the "forward rotation" is not necessarily clockwise or counterclockwise, and the "reverse rotation" is not necessarily clockwise or counterclockwise.
As shown in fig. 1 and 2, the vibration damper of the sewing machine of the invention comprises a lower rotating shaft 2, a transmission shaft 3 and a looper connecting rod 5, wherein the looper connecting rod 5 is parallel to the lower rotating shaft 2, the right end of the looper connecting rod 5 is used for installing a looper, the transmission shaft 3 is perpendicular to the looper connecting rod 5 and the lower rotating shaft 2, a connecting disc 9 is arranged on the lower rotating shaft 2, a lower shaft connecting rod 11 is hinged on the connecting disc 9, the lower shaft connecting rod 11 is in transmission connection with the transmission shaft 3, and the transmission shaft 3 is in transmission connection with the looper connecting rod 5; when the sewing machine works, the lower rotating shaft 2 rotates to drive the lower shaft connecting rod 11 to move up and down, so that the transmission shaft 3 is driven to rotate forwards or backwards, and the curved needle connecting rod 5 is driven to move left and right in a reciprocating manner; the lower rotating shaft 2 is connected with a lower shaft balance block 7, and when the lower shaft connecting rod 11 moves downwards to the lowest point, the mass center of the lower shaft balance block 7 is higher than the axis of the lower rotating shaft 2; when the lower shaft connecting rod 11 moves upwards to the highest point, the mass center of the lower shaft balance weight 7 is lower than the axis of the lower rotating shaft 2. According to the vibration damper of the sewing machine, when the sewing machine works, the lower rotating shaft 2 rotates to drive the lower shaft connecting rod 11 to move up and down, the lower shaft connecting rod 11 moves up and down to generate vertical inertial force and act on the lower rotating shaft 2 and finally be borne by a frame of the sewing machine, because the lower rotating shaft 2 is connected with the lower shaft balance block 7, when the lower shaft connecting rod 11 moves down to the lowest point, the inertial force generated by the lower shaft connecting rod 11 has a large vertical downward component, at the moment, the mass center of the lower shaft balance block 7 is higher than the axis center of the lower rotating shaft 2, and the inertial force generated by the lower shaft balance block 7 has a vertical upward component; when the lower shaft connecting rod 11 moves upwards to the highest point, the inertia force generated by the lower shaft connecting rod 11 has a larger vertical upward component, at the moment, the mass center of the lower shaft balance block 7 is lower than the axis of the lower rotating shaft 2, and the inertia force generated by the lower shaft balance block 7 has a vertical downward component; therefore, the inertia force generated by the lower shaft balance weight 7 can offset the inertia force of the lower shaft connecting rod 11 acting on the lower rotating shaft 2, thereby reducing the vibration and noise of the sewing machine, reducing the abrasion of the moving pair of the moving parts and improving the working environment of operators.
As shown in fig. 1 and 2, the sewing machine further comprises an upper rotating shaft 1 parallel to the lower rotating shaft 2, a sewing needle connecting rod 4 is connected to the upper rotating shaft 1 in a transmission manner, a sewing needle is mounted at the lower end of the sewing needle connecting rod 4, the sewing needle connecting rod 4 is perpendicular to the upper rotating shaft 1 and the lower rotating shaft 2, and when the sewing machine works, the upper rotating shaft 1 rotates and drives the sewing needle connecting rod 4 to reciprocate up and down; when the sewing needle connecting rod 4 moves downwards to the lowest point, the inertia force generated by the sewing needle connecting rod 4 has a larger vertical downward component, at the moment, the mass center of the lower shaft balance block 7 is higher than the axis center of the lower rotating shaft 2, and the inertia force generated by the lower shaft balance block 7 has a vertical upward component; when the needle connecting rod 4 moves upwards to the highest point, the inertia force generated by the needle connecting rod 4 has a larger vertical upward component, at the moment, the mass center of the lower shaft balance block 7 is lower than the axis of the lower rotating shaft 2, and the inertia force generated by the lower shaft balance block 7 has a vertical upward component; therefore, the inertial force generated by the lower shaft balance weight 7 can counteract the inertial force of the lower shaft connecting rod 11 acting on the lower rotating shaft 2. The lower rotating shaft 2 rotates and drives the transmission shaft 3 to rotate forwards or backwards, and the transmission shaft 3 rotates forwards or backwards in a reciprocating manner within a certain angle, so that the curved needle connecting rod 5 is driven to reciprocate leftwards and rightwards; the sewing needle connecting rod 4 and the curved needle connecting rod 5 are mutually matched to move so as to drive the sewing needle and the curved needle to finish sewing operation; an upper shaft balance block 6 is connected to the upper rotating shaft 1, a lower shaft balance block 7 is connected to the lower rotating shaft 2, an additional balance block 8 is connected to the transmission shaft 3, when the sewing machine works, the vertical inertia force can be generated by the up-and-down reciprocating motion of a sewing needle connecting rod 4 of the sewing machine, and the axial inertia force along the curved needle connecting rod 5 can be generated by the left-and-right reciprocating motion of the curved needle connecting rod 5; because the upper shaft balance block 6 is connected to the upper rotating shaft 1, the lower shaft balance block 7 is connected to the lower rotating shaft 2, the upper shaft balance block 6 can generate vertical inertial force along with the rotation of the upper rotating shaft 1, the lower shaft balance block 7 can generate vertical inertial force along with the rotation of the lower rotating shaft 2, the phase angle of the upper shaft balance block 6 on the upper rotating shaft 1 and the phase angle of the lower shaft balance block 7 on the lower rotating shaft 2 are set according to the actual situation of the inertial force when the upper shaft balance block 6, the lower shaft balance block 7 and the additional balance block 8 are not installed on the sewing machine, so that the directions of the inertial force generated by the sewing needle connecting rod 4 are opposite to the directions of the inertial force generated by the upper shaft balance block 6 and the lower shaft balance block 7, and the inertial force generated by the upper shaft balance block 6 and the lower shaft balance block 7 can partially or completely offset; the phase angle of the additional balance weight 8 on the transmission shaft 3 is set according to the actual situation of the inertia force of the sewing machine when the upper shaft balance weight 6, the lower shaft balance weight 7 and the additional balance weight 8 are not installed, so that the direction of the inertia force generated by the curved needle connecting rod 5 is opposite to the direction of the inertia force generated by the additional balance weight 8, and the inertia force generated by the additional balance weight 8 can partially or completely counteract the inertia force generated by the curved needle connecting rod 5. Therefore, the vibration damper of the sewing machine provided by the invention can reduce the vibration of the sewing machine, reduce the noise generated by the sewing machine, reduce the mechanical abrasion of the sewing machine, prolong the service life of the sewing machine and improve the working environment of operators.
In the vibration damper of the sewing machine of the invention, when the sewing needle connecting rod 4 moves downwards to the lowest point, the inertia force generated by the original parts of the sewing machine (such as the sewing needle connecting rod 4) to the frame of the sewing machine is downward, and at the moment, the mass center of the upper shaft balance weight 6 is higher than the shaft center of the upper shaft 1; the inertia force generated by the upper shaft balance block 6 (the magnitude and direction of the inertia force generated by the upper shaft balance block 6 are the same as the centrifugal force generated by the upper shaft balance block 6) has an upward component; when the needle connecting rod 4 moves upwards to the highest point, the inertia force generated by the original parts of the sewing machine to the frame of the sewing machine is upwards, at the moment, the mass center of the upper shaft balance block 6 is lower than the axis center of the upper rotating shaft 1, and the inertia force generated by the upper shaft balance block 6 has a downward component; therefore, the inertia force generated by the upper shaft balance block 6 has the function of offsetting the inertia force generated by the original parts of the sewing machine.
In the vibration damping device of the sewing machine, the lower rotating shaft 2 is in transmission connection with the transmission shaft 3, the rotation of the lower rotating shaft 2 can drive the transmission shaft 3 to rotate forwards or backwards within a certain angle range, as a preferred embodiment, as shown in fig. 4, O in fig. 4 is the rotating axis center of the lower rotating shaft 2, the connecting disc 9 on the lower rotating shaft 2 is coaxially and fixedly arranged with the lower rotating shaft 2, and the connecting disc 9 is driven by the lower rotating shaft 2 to rotate; a section of first articulated shaft 10 parallel to the lower articulated shaft 2 is arranged on the connecting disc 9; the lower shaft connecting rod 11 is hinged to the first hinge shaft 10, and referring to fig. 4 and 5, the lower end of the lower shaft connecting rod 11 is provided with a spherical hinge hole 12; the transmission shaft 3 is sleeved with a driven rocker 13, the driven rocker 13 is perpendicular to the transmission shaft 3, a spherical hinge joint 14 in hinged fit with the spherical hinge hole 12 is arranged at the end part of the driven rocker 13, so that the lower rotating shaft 2 rotates to drive the upper end of the lower shaft connecting rod 11 to rotate around the axis of the lower rotating shaft 2, the lower end of the lower shaft connecting rod 11 is hinged with the driven rocker 13, and the lower shaft connecting rod 11 drives the spherical hinge joint 14 of the driven rocker 13 to swing up and down, so that the transmission shaft 3 is driven to rotate forwards or backwards (in fig. 4, the transmission shaft 3 rotates clockwise or anticlockwise within a certain angle range). As shown in fig. 6, fixedly connected with drive rocker 15 on transmission shaft 3, drive rocker 15 perpendicular to transmission shaft 3, the upper end of drive rocker 15 is equipped with a drive block 16, still is fixed with two backstop blocks 17 on the looper connecting rod 5, drive block 16 is located between two backstop blocks 17, just can drive rocker 15 horizontal hunting when transmission shaft 3 corotation or reversal, and drive rocker 15 horizontal hunting can make drive block 16 and backstop block 17 butt on the left and stir looper connecting rod 5 left, or stir looper connecting rod 5 right with backstop block 17 butt on the right, and like this, looper connecting rod 5 just can left right reciprocating motion.
In the vibration damper of the sewing machine of the invention, the sewing needle connecting rod 4 is in transmission connection with the upper rotating shaft 1, the upper rotating shaft 1 rotates to drive the sewing needle connecting rod 4 to reciprocate up and down, as shown in fig. 3, a crank arm 20 is connected with the upper rotating shaft 1, an upper shaft connecting rod 18 is hinged on the crank arm 20, the lower end of the upper shaft connecting rod 18 is hinged on the sewing needle connecting rod 4, thus, the upper rotating shaft 1 rotates to drive 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 sewing needle connecting rod 4 to drive the sewing needle connecting rod 4 to reciprocate up and down. The inertia force of the upper rotating shaft 1 at the crank arm 20 is the largest, because the crank arm 20 itself is not a revolving body structure, the crank arm 20 generates inertia force and acts on the upper rotating shaft 1 when rotating, the speed component of the crank arm 20, the upper shaft connecting rod 18 and the sewing needle connecting rod 4 along the up-down direction (i.e. the vertical direction) is large when the sewing machine works, so the inertia force in the vertical direction generated by the crank arm 20, the upper shaft connecting rod 18 and the sewing needle connecting rod 4 acts on the upper rotating shaft 1 through the crank arm 20, in order to avoid the tendency that the sewing machine generates overturn due to the fact that the inertia force generated by the upper shaft balance weight 6 added on the upper rotating shaft 1 and the inertia force acting on the upper rotating shaft 1 by the crank arm 20 form a resultant force couple, the upper shaft balance weight 6 should be as close to the crank arm 20 as possible, as shown in fig. 3, the upper shaft balance weight 6 is arranged on the crank arm 20, the crank arm 20 is provided, the upper end of the upper shaft connecting rod 18 is hinged to the second hinge shaft 21, the upper shaft balance block 6 and the second hinge shaft 21 are respectively located on two sides of the axis of the upper rotating shaft 1, the crank arm 20 is provided with a sector block 19, and the upper shaft balance block 6 is detachably sleeved on the sector block 19. The sector 19 on the crank arm 20 can play a certain balance role on the inertia force generated by the crank arm 20, the needle connecting rod 4, the upper shaft connecting rod 18 and other parts.
In the vibration damper of the sewing machine, the upper shaft balance block 6 can be detachably connected with the upper shaft 1; of course, the balance of the inertial force of the upper shaft 1 may be taken into consideration when designing and installing the sewing machine, and the upper shaft balance weight 6 and the crank arm 20 may be integrally formed when manufacturing the first crank arm 20. Of course, the lower shaft balance weight 7 and the lower shaft 2 can be connected in a detachable connection mode, and the lower shaft balance weight 7 and the lower shaft 2 can also be arranged into an integral structure; the additional balance weight 8 and the transmission shaft 3 can be connected in a detachable connection mode, and the additional balance weight 8 and the transmission shaft 3 can also be arranged into an integral structure.
In a vibration damping device 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, and the looper is connected to the looperThe connecting rod 5 moves leftwards, the inertia force component in the vertical direction generated by the sewing needle 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 vertical inertia force component generated by the upper shaft balance block 6 connected on the upper rotating shaft 1 is F1zThe direction is upward; the vertical inertia force component generated by the lower shaft balance weight 7 connected to the lower rotating shaft 2 is F2zThe direction is upward; the vertical inertia force component generated by the additional balance weight 8 connected to the transmission shaft 3 is F3zThe direction is upward; because the direction of the vertical inertia force component generated by the upper shaft balance block 6, the lower shaft balance block 7 and the additional balance block 8 is opposite to the direction of the vertical inertia force component generated by the sewing needle connecting rod 4 and the lower shaft connecting rod 11, the vertical inertia force component generated by the upper shaft balance block 6, the lower shaft balance block 7 and the additional balance block 8 can offset the vertical inertia force component generated by the sewing needle connecting rod 4 and the lower shaft connecting rod 11. The inertia force component along the left and right direction generated by the curved needle connecting rod 5 is Fx, and the direction is leftward; and the component of the inertial force in the left-right direction generated by the additional weight 8 is F3xThe direction is to the right; therefore, the left-right direction inertial force component generated by the additional weight 8 can cancel the left-right direction inertial force component generated by the looper connecting rod 5. In order to avoid or reduce the tendency that the sewing machine topples due to the fact that a force couple is formed between the inertia force generated by the added balance blocks and the inertia force generated by the original parts of the sewing machine as much as possible, the added balance blocks are close to the original parts of the sewing machine generating larger inertia force as much as possible, in the vibration damping device of the sewing machine, the inertia force at the connecting position of the crank arm 20 on the upper rotating shaft 1 is larger, so that the upper shaft balance block 6 is close to the crank arm 20 as much as possible, and the upper shaft balance block 6 can be arranged on the crank arm 20; the inertia force generated at the lower shaft connecting rod 11 on the lower rotating shaft 2 is large, so the lower shaft balance weight 7 should be close to the lower shaft connecting rod 11 as much as possible, and in order to take account of the original structure of the sewing machine and the requirement of installing the lower shaft balance weight 7, the component of the distance between the mass center of the lower shaft balance weight 7 and the sewing needle in the axial direction of the lower rotating shaft 2 is 80-100 mm, preferably 90 mm;the driving rocker 15 on the transmission shaft 3 stirs the looper connecting rod 5 to reciprocate left and right, the inertia force generated at the connection position of the driving rocker 15 and the transmission shaft 3 is large, so the additional balance block 8 should be close to the driving rocker 15 as much as possible, and in order to take account of the original structure of the sewing machine and the requirement of installing the additional balance block 8, the component of the distance between the mass center of the additional balance block 8 and the sewing needle along the axial direction of the transmission shaft 3 is 5-20 mm, preferably 10 mm.
In the vibration damping device of a sewing machine of the present invention, as shown in fig. 8, the main parameters of the balance weight include the mass m of the balance weight (the mass of the balance weight can be equivalent to a mass point at the center of mass), the distance r between the center of mass and the rotation axis, and the included angle θ between the connecting line between the center of mass and the rotation axis and the vertical direction; in order to achieve a better balance effect of the whole sewing machine, parameters of the upper shaft balance block 6, the lower shaft balance block 7 and the additional balance block 8 need to be set and limited to a certain extent. Because of the structural limitation of the sewing machine, the mass and the volume of the balance weight are not too large, the upper shaft balance weight 6 is arranged on the crank arm 20, the installation space is large, and the relevant parameters of the upper shaft balance weight 6 can be set according to the actual requirements; the installation space of the lower shaft balance weight 7 and the additional balance weight 8 is relatively limited, preferably, the mass of the lower shaft balance weight 7 is 70 to 75 grams, and the distance between the center of mass of the lower shaft balance weight 7 and the axis of the lower rotating shaft 2 is 6 to 10 millimeters; the mass of the additional balance weight 8 is 160 to 200 g, and the distance between the mass center of the additional balance weight 8 and the axis of the lower rotating shaft 2 is 15 to 20 mm; in a specific application of the vibration damping device of the sewing machine of the present invention, the mass of the lower shaft balance weight 7 is 72.6 g, the distance between the center of mass of the lower shaft balance weight 7 and the axis of the lower shaft 2 is 8.62 mm, the mass of the additional balance weight 8 is 185.5 g, and the distance between the center of mass of the lower shaft balance weight 7 and the axis of the lower shaft 2 is 17.42 mm. In practical application, according to the inertia force and the inertia moment generated by the original parts of the sewing machine during actual working, through optimization and comprehensive calculation and by considering the actual installation space, the mass m of the upper shaft balance block 6, the lower shaft balance block 7 and the additional balance block 8, the distance r between the mass center and the rotating axis, the included angle theta between the connecting line between the mass center and the rotating axis and the vertical direction, the installation position of the upper shaft balance block 6 on the upper rotating shaft 1, the installation position of the lower shaft balance block 7 on the lower rotating shaft 2, the installation position of the additional balance block 8 on the transmission shaft 3 and other parameters are calculated, and the final appearance of the mass body is determined by combining the actual installation space and the assembly process of the machine.
In the vibration damping device of the sewing machine of the invention, preferably, when the sewing needle connecting rod 4 moves downwards to the lowest point, the mass center of the upper shaft balance block 6 is higher than the axis of the upper rotating shaft, and the included angle between the vertical direction and the connecting line between the mass center of the upper shaft balance block 6 and the axis of the upper rotating shaft 1 is 0-30 degrees; the mass center of the lower shaft balance block 7 is higher than the axis of the lower rotating shaft, and the included angle between the connecting line between the mass center of the lower shaft balance block 7 and the axis of the lower rotating shaft 2 and the vertical direction is 0-30 degrees; the barycenter of the additional balance weight 8 is lower than the axle center of the transmission shaft, the barycenter of the additional balance weight 8 is located on the right side of the axle center of the transmission shaft, an included angle between a connecting line between the barycenter of the additional balance weight 8 and the axle center of the transmission shaft 3 and the vertical direction is 35-75 degrees, preferably 55.8 degrees, and at the moment, the bent needle connecting rod moves to the leftmost end. When the needle connecting rod 4 moves upwards to the highest point, the mass center of the upper shaft balance block 6 is lower than the axis of the upper rotating shaft, and the included angle between the connecting line between the mass center of the upper shaft balance block 6 and the axis of the upper rotating shaft 1 and the vertical direction is 0-30 degrees; the mass center of the lower shaft balance block 7 is lower than the axis of the lower rotating shaft, and the included angle between the connecting line between the mass center of the lower shaft balance block 7 and the axis of the lower rotating shaft 2 and the vertical direction is 0-30 degrees; the mass center of the additional balance weight 8 is lower than the axis center of the transmission shaft, the mass center of the additional balance weight 8 is positioned on the right side of the axis center of the transmission shaft, and the included angle between the connecting line between the mass center of the additional balance weight 8 and the axis center of the transmission shaft 3 and the vertical direction is 0-40 degrees, preferably 20 degrees; at this time, the looper connecting rod moves to the rightmost end. Within the angle range, the inertia force generated by the upper shaft balance weight 6, the lower shaft balance weight 7 and the additional balance weight 8 can keep a state approximately opposite to the direction of the inertia force generated by the original parts of the sewing machine, and the inertia force generated by the original parts of the sewing machine can be well balanced. When the needle connecting rod 4 moves downwards to the lowest point or the needle connecting rod 4 moves upwards to the highest point, the transmission angle between the upper shaft connecting rod 18 and the needle connecting rod 4 is minimum, which is not beneficial to the rotation of the crank arm 20, at this time, if the mass center of the upper shaft balance block 6 has an included angle relative to the vertical direction, the inertia force generated by the upper shaft balance block 6 has a certain horizontal component, the horizontal component of the inertia force generated by the upper shaft balance block 6 is beneficial to the rotation of the crank arm 20, preferably, when the needle connecting rod 4 moves downwards to the lowest point or the needle connecting rod 4 moves upwards to the highest point, the included angle between the connecting line between the mass center of the upper shaft balance block 6 and the axis of the upper rotating shaft 1 and the vertical direction is 30 degrees, so that the component of the vertical direction of the inertia force generated by the upper shaft balance block 6 can better offset the inertia force generated by the original parts of the sewing, it is also possible to facilitate the crank arm 20 to keep rotating. When the needle connecting rod 4 moves downwards to the lowest point or the needle connecting rod 4 moves upwards to the highest point, the transmission angle between the lower shaft connecting rod 11 and the driven rocker 13 and the transmission angle between the driving rocker 15 and the looper connecting rod 5 both reach the minimum state, which is not beneficial to the rotation of the lower rotating shaft 2 and the transmission shaft 3, preferably, when the needle connecting rod 4 moves downwards to the lowest point or the needle connecting rod 4 moves upwards to the highest point, the included angle between the connecting line between the center of mass of the lower shaft balance block 7 and the axis of the lower rotating shaft 2 and the vertical direction is 20 degrees, and experiments prove that the component of the inertia force generated by the lower shaft balance block 7 along the left and right direction can better offset the inertia force generated by the original parts of the sewing machine along the left and right direction, and the lower rotating shaft 2 can also be beneficial to keep rotating.
In the vibration damping device of a sewing machine of the present invention, referring to fig. 8, preferably, when the needle connecting rod 4 moves downward to the lowest point, the center of mass of the upper shaft balance weight 6 is in an upward deflected state, and then the needle connecting rod 4 starts to move upward, and the included angle between the vertical direction and the connecting line between the center of mass of the upper shaft balance weight 6 and the axis of the upper rotating shaft 1 is gradually reduced; when the needle connecting rod 4 moves upwards to the highest point, the mass center of the upper shaft balance block 6 is in a downward deflection state, then the needle connecting rod 4 starts to move downwards, and the included angle between the vertical direction and the connecting line between the mass center of the upper shaft balance block 6 and the axis of the upper rotating shaft 1 is gradually reduced. When the lower shaft connecting rod 11 moves downwards to the lowest point, the sewing needle connecting rod 4 moves downwards to the lowest point, at the moment, the mass center of the lower shaft balance block 7 is in an upward deflection state, then, the lower shaft connecting rod 11 starts to move upwards, and the included angle between the vertical direction and the connecting line between the mass center of the lower shaft balance block 7 and the axis of the lower rotating shaft 2 is gradually reduced; when the lower shaft connecting rod 11 moves upwards to the highest point, the sewing needle connecting rod 4 moves upwards to the highest point, at the moment, the mass center of the lower shaft balance block 7 is in a downward deflection state, then, the lower shaft connecting rod 11 starts to move downwards, and the included angle between the vertical direction and the connecting line between the mass center of the lower shaft balance block 7 and the axis of the lower rotating shaft 2 is gradually reduced. When the needle connecting rod 4 moves downwards to the lowest position, the mass center of the additional balance weight 8 is in an upward deflection state; then, the needle connecting rod 4 starts to move upwards, and the included angle between the vertical direction and the connecting line between the center of mass of the additional balance block 8 and the axis of the lower rotating shaft 2 is gradually reduced; when the needle connecting rod 4 moves upwards to the highest position, the mass center of the additional balance weight 8 is in a downward deflection state, then the needle connecting rod 4 starts to move downwards, and the included angle between the vertical direction and the connecting line between the mass center of the additional balance weight 8 and the axis of the lower rotating shaft 2 is gradually reduced. When the curved needle connecting rod 5 moves leftwards to the leftmost position, the mass center of the additional balance block 8 is in a state of deflecting rightwards; then, the curved needle connecting rod 5 starts to move rightwards, and the included angle between the vertical direction and the connecting line between the center of mass of the additional balance block 8 and the axis of the lower rotating shaft 2 is gradually increased; when the curved needle connecting rod 5 moves rightwards to the rightmost end position, the mass center of the additional balance block 8 is in a leftward deflection state; subsequently, the looper connecting rod 5 starts to move leftwards, and the included angle between the vertical direction and the connecting line between the center of mass of the additional balance weight 8 and the axis of the lower rotating shaft 2 is gradually increased.
By calculating and analyzing the inertia force generated by the relevant parts in the vibration damping device of the sewing machine, as shown in fig. 9, the inertia force generated by the whole machine (i.e. the sewing machine without the upper shaft balance weight 6, the lower shaft balance weight 7 and the additional balance weight 8) is periodically changed along with the rotation of the main shaft of the sewing machine, the wave peak value and the wave trough value are respectively 1000N and-600N, and the overall fluctuation is large. As shown in fig. 10 to 12, the phases of the vertical direction inertial forces generated by the upper shaft balance mass 6, the lower shaft balance mass 7, and the additional balance mass 8 are substantially the same and opposite in direction, and as shown in fig. 13, the phase of the left-right direction inertial force component generated by the additional balance mass 8 is substantially the same and opposite in direction to the phase of the left-right direction inertial force component of the entire machine; therefore, the inertia force of the part of the whole machine in the vertical direction is counteracted, and the effect of reducing the vibration of the whole machine is achieved. 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 device of the sewing machine can play a role in reducing the vibration of the whole machine, and are not mutually conflicted, a single or a plurality of upper shaft balance blocks 6, the lower shaft balance blocks 7 and the additional balance blocks 8 can be selected to be combined for use according to actual needs, and the optimal state can be reached by simultaneously combining and using the upper shaft balance blocks 6, the lower shaft balance blocks 7 and the additional balance blocks 8.
The present invention also provides a sewing machine, corresponding to the vibration damping device of the sewing machine of the present invention, which adopts the above technical scheme or any preferable technical scheme.
Based on the technical scheme of the embodiment, the sewing machine and the vibration damping device thereof have the following beneficial effects:
1. the mode of adding the balance block on the specific rotating shaft offsets or partially offsets the inertia force and the inertia moment generated by the moving part in the existing sewing machine, thereby reducing the vibration and the noise of the sewing machine, reducing the mechanical abrasion at the moving pair of the sewing machine and improving the operating environment of operators;
2. the three balance blocks can be used independently or in combination to reduce the vibration of the whole machine, are not mutually conflicted, and can be used independently or in combination according to actual needs;
3. the maneuverability is strong, the existing motion mechanism is not required to be changed, and the balance block has simple structure and low cost.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A vibration damper of a sewing machine is characterized in that: the needle bending device comprises a lower rotating shaft (2), a transmission shaft (3) and a needle bending connecting rod (5), wherein the needle bending connecting rod (5) is parallel to the lower rotating shaft (2), the transmission shaft (3) is perpendicular to the needle bending connecting rod (5) and the lower rotating shaft (2), a connecting disc (9) is arranged on the lower rotating shaft (2), a lower shaft connecting rod (11) is hinged on the connecting disc (9), the lower shaft connecting rod (11) is in transmission connection with the transmission shaft (3), and the transmission shaft (3) is in transmission connection with the needle bending connecting rod (5); when the sewing machine works, the lower rotating shaft (2) rotates to drive the lower shaft connecting rod (11) to move up and down, so that the transmission shaft (3) is driven to rotate forwards or backwards, and the curved needle connecting rod (5) is driven to move left and right in a reciprocating manner;
a lower shaft balance block (7) is connected to the lower rotating shaft (2), an additional balance block (8) is connected to the transmission shaft (3), and when the lower shaft connecting rod (11) moves downwards to the lowest point, the mass center of the lower shaft balance block (7) is higher than the axis center of the lower rotating shaft (2); when the lower shaft connecting rod (11) moves upwards to the highest point, the mass center of the lower shaft balance block (7) is lower than the axis of the lower rotating shaft (2);
when the lower shaft connecting rod (11) moves downwards to the lowest point, the mass center of the lower shaft balance block (7) is higher than the axis of the lower rotating shaft, and the included angle between the connecting line between the mass center of the lower shaft balance block and the axis of the lower rotating shaft (2) and the vertical direction is 0-30 degrees; the mass center of the additional balance block (8) is lower than the axis center of the transmission shaft, the mass center of the additional balance block (8) is positioned on the right side of the axis center of the transmission shaft, and an included angle between a connecting line between the mass center of the additional balance block (8) and the axis center of the transmission shaft (3) and the vertical direction is 35-75 degrees;
when the lower shaft connecting rod (11) moves upwards to the highest point, the mass center of the lower shaft balance block (7) is lower than the axis of the lower rotating shaft, and the included angle between the vertical direction and the connecting line between the mass center of the lower shaft balance block and the axis of the lower rotating shaft (2) is 0-30 degrees; the mass center of the additional balance block (8) is lower than the axis center of the transmission shaft, the mass center of the additional balance block (8) is positioned on the right side of the axis center of the transmission shaft, and an included angle between a connecting line between the mass center of the additional balance block (8) and the axis center of the transmission shaft (3) and the vertical direction is 0-40 degrees; at this time, the looper connecting rod moves to the rightmost end.
2. The vibration damping device of a sewing machine according to claim 1, wherein: when the lower shaft connecting rod (11) moves downwards to the lowest point, the mass center of the lower shaft balance block (7) is in an upward deflection state; when the lower shaft connecting rod (11) moves upwards to the highest point, the mass center of the lower shaft balance block (7) is in a downward deflection state.
3. The vibration damping device of a sewing machine according to claim 1, wherein: a section of first articulated shaft (10) parallel to the lower articulated shaft (2) is arranged on the connecting disc (9); the lower shaft connecting rod (11) is hinged on the first hinged shaft (10), and the lower end of the lower shaft connecting rod (11) is provided with a spherical hinged hole (12); a driven rocker (13) is sleeved on the transmission shaft (3), the driven rocker (13) is perpendicular to the transmission shaft (3), and a spherical hinge joint (14) in hinged fit with the spherical hinge hole (12) is arranged at the end part of the driven rocker (13); a driving rocker (15) is fixedly connected to the transmission shaft (3), the driving rocker (15) is perpendicular to the transmission shaft (3), a driving block (16) is arranged at the end part of the driving rocker (15), two stop blocks (17) are further fixed to the curved needle connecting rod (5), and the driving block (16) is located between the two stop blocks (17); the transmission shaft (3) rotates forwards or backwards to drive the end part of the driven rocker (13) to swing up and down and drive the end part of the rocker (15) to swing left and right.
4. The vibration damping device of a sewing machine according to claim 1, wherein: the lower shaft balance weight (7) is detachably connected to the lower rotating shaft (2).
5. The vibration damping device of a sewing machine according to claim 1, wherein: the sewing needle balance block further comprises a sewing needle connecting rod (4) moving up and down, the sewing needle connecting rod (4) is perpendicular to the lower rotating shaft (2), and when the sewing needle connecting rod (4) moves down to the lowest point, the mass center of the lower shaft balance block (7) is higher than the axis center of the lower rotating shaft (2); when the needle connecting rod (4) moves upwards to the highest point, the mass center of the lower shaft balance block (7) is lower than the axis of the lower rotating shaft (2).
6. The vibration damping device of a sewing machine according to claim 5, wherein: the mass of the lower shaft balance weight (7) is 70-75 g, and the distance between the center of mass of the lower shaft balance weight (7) and the axis of the lower rotating shaft (2) is 6-10 mm.
7. The vibration damping device of a sewing machine according to claim 5, wherein: when the needle connecting rod (4) moves downwards to the lowest point, the mass center of the lower shaft balance block (7) is in an upward deflection state.
8. A sewing machine is characterized in that: a vibration damping device comprising the sewing machine according to any one of claims 1 to 7.
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| CN201611235828.0A CN106854798B (en) | 2016-12-28 | 2016-12-28 | Sewing machine and vibration damper thereof |
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| CN109706644B (en) * | 2019-01-24 | 2021-06-25 | 杰克缝纫机股份有限公司 | Flat seaming machine looper driving structure and method for reducing flat seaming machine skip stitches |
| CN112460215B (en) * | 2020-11-24 | 2022-12-30 | 中国科学院光电技术研究所 | Offset shafting thrust reaction cancellation device |
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| CN2749899Y (en) * | 2004-06-30 | 2006-01-04 | 陈茂选 | Linkage presser foot mechanism for sewing machine |
| CN201183881Y (en) * | 2008-03-27 | 2009-01-21 | 靖纺股份有限公司 | Main shaft transmission crankshaft composite structure of sewing machine |
| CN204097717U (en) * | 2014-09-25 | 2015-01-14 | 杰克缝纫机股份有限公司 | Overlock-seaming machine needle rod mechanism |
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| JPH11226283A (en) * | 1998-02-17 | 1999-08-24 | Yamato Sewing Mach Co Ltd | Needlebar stroke adjusting device of sewing machine |
| JP2002143587A (en) * | 2000-11-07 | 2002-05-21 | Juki Corp | Moving mechanism for sewing machine |
| JP2009125126A (en) * | 2007-11-20 | 2009-06-11 | Tokai Ind Sewing Mach Co Ltd | Multi-head sewing machine and method of controlling operation of multi-head sewing machine |
| JP5312011B2 (en) * | 2008-03-06 | 2013-10-09 | Ｊｕｋｉ株式会社 | sewing machine |
| CN102619034A (en) * | 2012-04-16 | 2012-08-01 | 王佑武 | Needle rod driving device of improved sewing machine |
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| GB610199A (en) * | 1946-03-30 | 1948-10-12 | British United Shoe Machinery | Improvements in or relating to sewing and mechanism adapted for use in sewing machines |
| CN2749899Y (en) * | 2004-06-30 | 2006-01-04 | 陈茂选 | Linkage presser foot mechanism for sewing machine |
| CN201183881Y (en) * | 2008-03-27 | 2009-01-21 | 靖纺股份有限公司 | Main shaft transmission crankshaft composite structure of sewing machine |
| CN204097717U (en) * | 2014-09-25 | 2015-01-14 | 杰克缝纫机股份有限公司 | Overlock-seaming machine needle rod mechanism |
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