阅读说明：本技术 一种缝纫机 (Sewing machine ) 是由 黄小青 蔡炳清 祝书伟 于 2019-09-16 设计创作，主要内容包括：本发明公开了一种缝纫机,包括主轴、针杆曲柄滑块机构和针杆组件,针杆曲柄滑块机构的针杆曲柄与主轴相连,针杆曲柄滑块机构的针杆滑块与针杆组件相连,还包括：用于平衡针杆组件在竖直方向上产生的惯性力的平衡滑块；与平衡滑块相连、用于驱动平衡滑块沿竖直方向运动的直线驱动机构,平衡滑块的运动方向与针杆滑块的运动方向相反。该缝纫机中,平衡滑块与针杆滑块在竖直方向上产生的惯性力的方向完全相反,因此,可使平衡滑块平衡针杆组件的惯性力,以避免缝纫机在竖直方向上振动。同时,由于平衡滑块仅沿竖直方向运动,在其它方向无驱动力和运动,不会在其它方向产生新的惯性力,可避免缝纫机在前后方向上振动。(The invention discloses a sewing machine, which comprises a main shaft, a needle rod crank sliding block mechanism and a needle rod assembly, wherein a needle rod crank of the needle rod crank sliding block mechanism is connected with the main shaft, a needle rod sliding block of the needle rod crank sliding block mechanism is connected with the needle rod assembly, and the sewing machine also comprises: a balance slide block for balancing the inertia force generated by the needle bar assembly in the vertical direction; and the linear driving mechanism is connected with the balance sliding block and is used for driving the balance sliding block to move along the vertical direction, and the moving direction of the balance sliding block is opposite to that of the needle bar sliding block. In the sewing machine, the directions of the inertia forces generated by the balance slide block and the needle bar slide block in the vertical direction are completely opposite, so that the balance slide block can balance the inertia force of the needle bar assembly to avoid the sewing machine from vibrating in the vertical direction. Meanwhile, the balance slide block only moves along the vertical direction, and no driving force or movement exists in other directions, so that new inertia force cannot be generated in other directions, and the sewing machine can be prevented from vibrating in the front-back direction.)

1. The utility model provides a sewing machine, includes main shaft (1), needle bar slider-crank mechanism (2) and needle bar subassembly (3), needle bar crank (21) of needle bar slider-crank mechanism (2) with main shaft (1) links to each other, needle bar slider (22) of needle bar slider-crank mechanism (2) with needle bar subassembly (3) link to each other, its characterized in that still includes:

A balancing slider (4) for balancing the inertial force generated by the needle bar assembly (3) in the vertical direction;

and the linear driving mechanism is connected with the balance sliding block (4) and is used for driving the balance sliding block (4) to move along the vertical direction, and the moving direction of the balance sliding block (4) is opposite to that of the needle bar sliding block (22).

2. Sewing machine as in claim 1, characterized in that said balancing slider (4) is arranged vertically colinear with said needle bar assembly (3).

3. The sewing machine of claim 1, wherein the linear drive mechanism comprises:

An eccentric wheel (51) fixedly sleeved with the main shaft (1);

One end of the connecting rod (52) is rotatably sleeved with the eccentric wheel (51), and the other end of the connecting rod (52) is connected with the balance sliding block (4);

And the sliding chute (53) is arranged on the shell of the sewing machine and is used for limiting the moving direction of the balance sliding block (4).

4. sewing machine as in claim 3, characterized in that it also comprises a counterweight (6) associated with said balancing slider (4) for increasing the balancing inertial force of said balancing slider (4).

5. Sewing machine as in claim 3, characterized in that said eccentric (51) is provided with at least one lightening hole (511).

6. Sewing machine as in any claim from 3 to 5, characterized in that the centre of said eccentric (51) and said shank crank (21) are arranged at 180 ° with respect to said main shaft (1).

7. Sewing machine as in claim 6, characterized in that it further comprises a balancing mass (7) associated with said shank crank (21) for cooperating with said balancing slider (4) to balance the inertial forces of said shank assembly (3), said balancing mass (7) being arranged at 180 ° with respect to said spindle (1) with respect to said shank crank (22).

Technical Field

The invention relates to the technical field of sewing equipment, in particular to a sewing machine.

Background

For sewing machines such as flat sewing machines and flat sewing machines, a needle bar needling mechanism generally comprises a needle bar assembly and a needle bar slider-crank mechanism, the output end of which is connected with the needle bar assembly, and the input end of the needle bar slider-crank mechanism is connected with a main shaft of the sewing machine so as to convert the high-speed rotation motion of the main shaft of the sewing machine into the vertical up-and-down motion of the needle bar assembly, thereby realizing the up-and-down motion of a machine needle.

During the up and down movement of the needle bar assembly, an extremely large inertial force is generated in the vertical direction, which is also a main source of vibration of the sewing machine. In the prior art, in order to balance the inertia force generated by the needle bar cloth pricking mechanism in the vertical direction, an eccentric balance block is installed on a main shaft, and the installation angle of the eccentric part of the eccentric balance block and the installation angle of the eccentric part of a needle bar crank of the needle bar crank sliding block mechanism form 180 degrees, so that the inertia force generated by the needle bar cloth pricking mechanism is balanced by utilizing the centrifugal force of the eccentric balance block.

however, although this solution can balance the inertia force generated in the vertical direction by the needle bar-needling mechanism, when the eccentric weight rotates along with the sewing machine main shaft, a new inertia force is generated in the front-rear direction of the sewing machine due to the centrifugal force of the eccentric weight, and the vibration in the front-rear direction of the sewing machine is increased.

Therefore, those skilled in the art have been eagerly faced with the need to provide a sewing machine capable of reducing the inertia force in the front-rear direction while balancing the inertia force generated in the vertical direction by the needle bar needling mechanism.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a sewing machine capable of reducing the inertia force in the front-rear direction of the sewing machine while balancing the inertia force generated in the vertical direction by a needle bar-needling mechanism, and reducing the vibration of the whole sewing machine.

In order to achieve the above purpose, the invention provides the following technical scheme:

The utility model provides a sewing machine, includes main shaft, needle bar slider-crank mechanism and needle bar subassembly, needle bar slider-crank mechanism's needle bar crank with the main shaft links to each other, needle bar slider of needle bar slider-crank mechanism with the needle bar subassembly links to each other, still includes:

A balancing slider for balancing the inertial force generated by the needle bar assembly in the vertical direction;

And the linear driving mechanism is connected with the balance sliding block and is used for driving the balance sliding block to move along the vertical direction, and the moving direction of the balance sliding block is opposite to that of the needle bar sliding block.

Preferably, the balancing slider is disposed in line with the needle bar assembly in the vertical direction.

preferably, the linear driving mechanism includes:

the eccentric wheel is fixedly sleeved with the main shaft;

One end of the connecting rod is rotatably sleeved with the eccentric wheel, and the other end of the connecting rod is connected with the balance sliding block;

The sliding groove is arranged on a shell of the sewing machine and used for limiting the moving direction of the balance sliding block.

Preferably, the balance weight further comprises a balance weight connected with the balance slide block and used for increasing the balance inertia force of the balance slide block.

Preferably, the eccentric is provided with at least one lightening hole.

Preferably, the center of the eccentric and the needle bar crank are disposed at 180 ° with respect to the main shaft.

Preferably, the balance block is connected with the needle rod crank and used for cooperating with the balance slide block to balance the inertia force of the needle rod assembly, and the balance block and the needle rod crank are arranged at 180 degrees relative to the main shaft.

According to the sewing machine provided by the invention, acting force is applied to the balance slide block through the linear driving mechanism, so that the balance slide block vertically moves up and down. Since the movement direction of the balance slider is completely opposite to the movement direction of the needle bar slider, the inertial force generated in the vertical direction by the balance slider is completely opposite to the direction of the inertial force generated in the vertical direction by the needle bar slider. Therefore, the inertia force of the balance sliding block and the inertia force of the needle bar assembly can be completely offset by enabling the balance sliding block and the needle bar assembly to have the same inertia force, the purpose of completely balancing the inertia force generated by the needle bar assembly in the vertical direction through the balance sliding block is achieved, and the vibration of the sewing machine in the vertical direction can be avoided.

Meanwhile, compared with the prior art, the mode that the eccentric balance block is arranged on the main shaft and the inertia force of the needle bar assembly in the vertical direction is balanced by the centrifugal force of the eccentric balance block is adopted, and the balance sliding block only moves in the vertical direction and does not have driving force and movement in other directions, so that new inertia force cannot be generated in other directions, the inertia force generated in the front and back directions of the sewing machine due to the fact that the eccentric balance block moves along with the main shaft can be avoided, and vibration in the front and back directions of the sewing machine is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view of a needle bar assembly and a reverse slider-crank mechanism of a sewing machine according to an embodiment of the present invention;

Fig. 2 is an exploded view of fig. 1.

the reference numerals in fig. 1 and 2 are as follows:

The device comprises a main shaft 1, a main shaft front shaft 11, a main shaft rear shaft 12, a connecting shaft sleeve 13, a needle rod crank slide block mechanism 2, a needle rod crank 21, a needle rod slide block 22, a needle rod connecting rod 23, a needle rod assembly 3, a balance slide block 4, an eccentric wheel 51, a lightening hole 511, a connecting rod 52, a sliding groove 53, a balancing weight 6 and a balancing weight 7.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

the core of the invention is to provide a sewing machine which can balance the inertia force generated by a needle bar cloth pricking mechanism in the vertical direction, and can reduce the inertia force in the front and back directions of the sewing machine, and the whole sewing machine has small vibration.

Referring to fig. 1-2, fig. 1 is a schematic structural view of a needle bar assembly and a reverse crank-slider mechanism of a sewing machine according to an embodiment of the present invention; fig. 2 is an exploded view of fig. 1.

The invention provides a sewing machine, including the basic shaft 1, needle blade crank slide block mechanism 2, needle blade assembly 3 and needle blade inertia force balance mechanism, the needle blade crank slide block mechanism 2 includes the needle blade crank 21, needle blade connecting rod 23 and needle blade slide block 22, the needle blade connecting rod 23 links with needle blade crank 21 and needle blade slide block 22 separately through the revolute pair, the needle blade crank 21 links with basic shaft 1, the needle blade slide block 22 links with needle blade assembly 3, in order to change the rotary motion of the basic shaft 1 into the up-and-down motion of the needle blade assembly 3 through the needle blade crank slide block mechanism 2; the needle bar inertia force balancing mechanism is used for balancing the inertia force generated by the needle bar assembly 3 in the process of moving up and down.

It should be noted that the main structures of the main shaft 1, the needle bar crank slider mechanism 2 and the needle bar assembly 3 in the present invention are respectively the same as the structures of the main shaft 1, the needle bar crank slider mechanism 2 and the needle bar assembly 3 of the conventional sewing machine in the prior art, and meanwhile, the structures of other parts of the sewing machine refer to the prior art and are not described herein again.

The main improvement of the present invention lies in balancing the inertial force generated during the up-and-down movement of the needle bar assembly 3 by providing a needle bar inertial force balancing mechanism, specifically, the needle bar inertial force balancing mechanism includes a balancing slider 4 and a linear driving mechanism connected to the balancing slider 4 to drive the balancing slider 4 to move vertically in a direction completely opposite to the movement direction of the needle bar slider 22, so that the balancing slider 4 balances the inertial force generated in the vertical direction of the needle bar assembly 3.

That is, in the present invention, the force is applied to the balancing slider 4 by the linear driving mechanism to vertically move the balancing slider 4 up and down. When the needle bar assembly 3 moves upwards, the balance slide block 4 moves vertically downwards; when the needle bar assembly 3 moves downwards, the balance slide block 4 moves vertically upwards; that is, the movement direction of the balance slider 4 is completely opposite to the movement direction of the needle bar slider 22, and therefore, the inertial force generated in the vertical direction by the balance slider 4 is completely opposite to the direction of the inertial force generated in the vertical direction by the needle bar slider 22.

Meanwhile, on the premise of the above scheme, a person skilled in the art can make the balance slider 4 and the needle bar assembly 3 have the same magnitude of inertial force through several tests or structural design or changing the acceleration of the driving force of the linear driving mechanism.

Therefore, the inertia force of the balance slide block 4 and the inertia force of the needle bar assembly 3 can be completely offset, the aim of completely balancing the inertia force generated by the needle bar assembly 3 in the vertical direction through the balance slide block 4 is achieved, and the vibration of the sewing machine in the vertical direction can be avoided.

meanwhile, compared with the prior art, the eccentric balance block is arranged on the main shaft 1, the mode of balancing the inertia force of the needle bar assembly 3 in the vertical direction by means of the centrifugal force of the eccentric balance block is adopted, and the balance sliding block 4 only moves in the vertical direction and does not have driving force and movement in other directions, so that new inertia force cannot be generated in other directions, the inertia force generated in the front-back direction of the sewing machine due to the fact that the eccentric balance block moves along with the main shaft 1 can be avoided, and vibration in the front-back direction of the sewing machine can be avoided.

It should be noted that the specific structure of the balance slider 4 is not limited in the present invention, as long as the balance slider 4 has a certain mass and can balance the inertial force of the needle bar assembly 3 in the vertical direction.

meanwhile, the present invention does not limit the specific structure of the linear drive mechanism and the operation principle thereof, as long as the balance slider 4 can generate a reciprocating motion in the vertical direction which is completely opposite to the movement direction of the needle bar slider 22. For example, the linear driving mechanism may be a linear motor, a linear module, a telescopic mechanism capable of outputting linear motion, or the like, or the linear driving mechanism may be a motor capable of outputting rotational motion and a transmission mechanism capable of converting the rotational motion of the motor into the movement of the balance slider 4.

Further, the specific installation position of the needle bar inertia force balancing mechanism is not limited in the present invention, for example, the needle bar inertia force balancing mechanism may be installed at any position of the sewing machine housing, or may be installed at another part of the sewing machine, that is, another part of the sewing machine may be used as the support part of the needle bar inertia force balancing mechanism.

it will be appreciated that the sewing machine is generally of a cantilever beam construction, and the needle bar assembly 3 is located at the end of the cantilever beam, so that the inertial force of the needle bar assembly 3 exerts a certain moment on the sewing machine body. Similarly, the arrangement position of the balance slide block 4 determines the moment generated by the inertia force of the balance slide block 4 to the sewing machine body. As can be seen from the above, the inertial force of the balance slider 4 is ideally equal to the inertial force of the needle bar assembly 3, and therefore, the closer the balance slider 4 is to the needle bar assembly 3, the better the moment balance effect of the balance slider 4 on the needle bar assembly 3, and in order to make the balance slider 4 balance the moment action of the needle bar assembly 3 on the sewing machine body at the same time, as a preferable solution, on the basis of the above-mentioned embodiment, the balance slider 4 and the needle bar assembly 3 are arranged in a collinear manner in the vertical direction.

That is to say, the balance slide block 4 is arranged on the axial extension line of the needle bar component 3, which can ensure that the force arms from the needle bar component 3 and the balance slide block 4 to the cantilever beam supporting point of the sewing machine are equal, so that when the inertia force of the balance slide block 4 is equal to the inertia force of the needle bar component 3, the moment of the balance slide block 4 to the sewing machine body is equal to the moment of the needle bar component 3 to the sewing machine body, and the directions of the inertia force of the balance slide block 4 and the inertia force of the needle bar component 3 are completely opposite, therefore, the moments generated by the two can be completely offset, that is, in the embodiment, the balance slide block 4 not only can balance the inertia force generated by the needle bar component 3 in the vertical direction, but also can balance the moment.

Furthermore, it should be noted that the power source of the linear driving mechanism of the needle bar inertia force balancing mechanism may be a new power output device independent of the existing power source of the sewing machine, or may be the existing power source of the sewing machine, that is, the balancing slider 4 and other components of the sewing machine share the power source. For example, the power source of the linear driving mechanism may be the main shaft 1, and the linear driving mechanism is a transmission mechanism for converting the rotational motion of the main shaft 1 into the vertical motion of the balance block 4.

Preferably, based on the above embodiment, the linear driving mechanism includes an eccentric 51, a connecting rod 52 and a sliding slot 53, the eccentric 51 is fixedly sleeved with the main shaft 1 to rotate along with the rotation of the main shaft 1, one end of the connecting rod 52 is a sleeve rotatably sleeved with the eccentric 51, the other end of the connecting rod 52 is connected with the balance sliding block 4, and the sliding slot 53 is arranged on the machine shell of the sewing machine and used for limiting the vertical moving direction of the balance sliding block 4.

That is, the linear driving mechanism and the balance slide block 4 form a reverse crank slide block mechanism, and the power input of the reverse crank slide block mechanism is the rotation motion of the main shaft 1, so that the rotation power of the main shaft 1 is utilized to drive the balance slide block 4 to move, and the inertia force of the needle bar assembly 3 is balanced.

It will be appreciated that the main shaft 1 generally comprises a main shaft front shaft 11 and a main shaft rear shaft 12, the main shaft front shaft 11 and the main shaft rear shaft 12 being fixedly connected by a coupling sleeve 13, and the eccentric 51 is preferably provided on the main shaft rear shaft 12 in view of space limitations.

In order to improve the balance effect, on the basis of the above embodiment, a balancing weight 6 connected to the balance slider 4 is further included, and the balancing weight 6 is used for increasing the balance inertia force of the balance slider 4, so that the balance slider 4 can balance the inertia force of the needle bar assembly 3.

The specific shape and weight of the weight 6 are not limited in this embodiment, and those skilled in the art can select the weight according to actual needs.

It is understood that, due to the eccentric action of the eccentric 51, vibration is generated in the front and rear direction of the sewing machine when the eccentric 51 rotates together with the main shaft 1, and in order to reduce the vibration of the sewing machine in the front and rear direction caused by the eccentric 51 as much as possible, the eccentric 51 is provided with at least one lightening hole 511 on the basis of the above-described embodiment.

That is, the present embodiment reduces the weight of the eccentric 51 by the lightening holes 511, thereby reducing the centrifugal force of the eccentric 51 and further reducing the vibration of the eccentric 51 in the front and rear directions of the sewing machine.

It will be appreciated that in the above-described reverse crank-slider mechanism, the balance slider 4 is mainly used to balance the inertial force of the needle bar assembly 3, and therefore, the eccentric 51 may be made of a lightweight material as much as possible.

In order to further increase the balancing effect, on the basis of any of the above-described embodiments, the center of the eccentric 51 and the shank crank 21 are arranged at 180 ° with respect to the main shaft 1.

That is, the phase difference between the eccentric portion of the eccentric wheel 51 and the needle bar crank 21 is 180 °, which makes the centrifugal forces of the eccentric wheel 51 and the needle bar crank 21 completely opposite to each other, so that the eccentric wheel 51 has a function of balancing the inertial force of the needle bar crank 21, thereby further improving the overall balance effect of the sewing machine and minimizing the vibration of the sewing machine.

It can be understood that, when the above-mentioned reverse crank slider mechanism is disposed on the main shaft 1 to balance the inertia force of the needle bar assembly 3, due to the structural limitation, the distance between the reverse crank slider mechanism and the needle bar assembly 3 is relatively long, and therefore, the moment balance effect is poor, and in order to improve the moment balance effect, on the basis of the above-mentioned embodiment, the balance weight 7 connected to the needle bar crank 21 is further included, the balance weight 7 is used for cooperating with the balance slider 4 to balance the inertia force of the needle bar assembly 3, and the balance weight 7 and the needle bar crank 21 are disposed at 180 ° with respect to the main shaft 1.

That is, in the present embodiment, the balance weight 7 and the balance slider 4 cooperate to balance the inertia force of the needle bar assembly 3 in the vertical direction, and the balance weight 7 is connected to the needle bar crank 21, so that the balance weight 7 can well balance the moment of the needle bar assembly 3; meanwhile, due to the effect of the balance sliding block 4, the inertia force required to be balanced by the balance block 7 can be shared, and therefore, compared with the prior art, the mass of the balance block 7 can be reduced, so that the centrifugal force generated by the balance block 7 in the front-back direction of the sewing machine is reduced, and the vibration of the sewing machine in the front-back direction is reduced.

in view of the connection manner of the weight 7 and the needle bar crank 21, it is preferable that the weight 7 and the needle bar crank 21 are integrally formed.

the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The sewing machine provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.