WO2016017936A1

WO2016017936A1 - Apparatus for changing and converting model of sewing machine

Info

Publication number: WO2016017936A1
Application number: PCT/KR2015/006606
Authority: WO
Inventors: 김광연
Original assignee: 김광연
Priority date: 2014-07-29
Filing date: 2015-06-29
Publication date: 2016-02-04
Also published as: KR101495287B1; CN106471172B; CN106471172A

Abstract

Disclosed is an apparatus for changing and converting the model of a sewing machine. The present invention comprises: a substitute crank rod for replacing a crank rod installed on an upper shaft of the sewing machine, thereby changing the vertical movement trajectory of a needlebar; and a substitute thread take-up lever for forming a stroke trajectory which is changed in accordance with the vertical movement trajectory of the substituted crank rod, thereby allowing changing or converting of the model of the sewing machine by adjusting the vertical movement trajectory of the needlebar and the movement trajectory of a stroke of the thread take-up lever.

Description

Model variable and switching device of sewing machine

The present invention relates to a variable type and switching device of the sewing machine, and more particularly, to a variable type and switching device of the sewing machine to change the type of the sewing machine or induce a change by adjusting the lifting trajectory of the needle bar and the stroke of the thread take-up.

The rotating shaft of the sewing machine is divided into upper and lower shafts. The upper shaft drives the needle bar mechanism, the thread take-up mechanism, and the like through a counterweight that rotates by the rotation of the shaft.

In order to increase the vertical motion of the needle bar, the connection position of the needle bar crank rod with respect to the counterweight should be set to a position where the amount of eccentricity from the center of rotation of the counterweight is large. If the eccentricity is large, since the movement trajectories of the needle bar crank rod and the thread take-up crank overlap and contact each other when the sewing machine is driven, a problem arises in that the vertical motion of the needle bar cannot be increased. In particular, in the thick sewing machine for sewing materials, it is desirable to increase the amount of time the needle sticks out of the fabric as long as possible in order to move the sewing material without difficulty. do.

In addition, in order to cope with the high speed of the sewing machine, a large diameter bearing can be used when connecting between rotating members, but a large diameter bearing can be used for connecting the sewing machine frame side of the take-up crank and the crank shaft of the needle bar crank rod. Since the diameter itself of each connecting portion is enlarged, both connecting portions are in contact with each other, making it impossible to use, and there is a problem in that the sewing machine can not be speeded up. Although the method of separating the position of the thread take-up support shaft in the radial direction from the upper shaft can also be considered, in this case, since the thread take-up support shaft is spaced apart, the rising speed of the thread take-up slows down and the thread tightening becomes worse.

The length of the crank rod in the thick sewing machine (also known as the '415' model) for sewing thick sewing materials such as leather ('413' model) for sewing sewing materials such as cloth with relatively thin thickness. It is set long compared with the length of the crank rod). That is, the length of the crank rods used in the sewing machine for thick / museum are each different. And the movement stroke of a thread take-up lever is set accordingly. Thread take-up is a loop that passes through the upper thread before sewing on the needle, and it controls the pulling.

The thick sewing machine is close to an industrial sewing machine, and the sewing machine for a museum is close to a domestic sewing machine, but the driving principle or operation of the mechanism is consistent and there is no difference. However, the sewing machine for thick is set longer than the length of the sewing machine for crank rod and thread take-up.

That is, the length of the crank rod and the length of the thread take-up applied to the sewing machine for sewing a sewing material such as thick leather and the like and the sewing machine for sewing a thin cloth or the like have a difference. In case of the sewing machine for thick goods, the length of the crank rod is made long enough to secure the lifting trajectory of the needle bar so that the lifting trajectory of the needle bar can be increased in order to secure the time that the needle has escaped from the sewing as long as possible. . In the case of a sewing machine for museums, the length of time that the needle is pulled out of the sewing machine may be shorter, so that the length of the crank rod is shorter than that for the sewing machine for sewing machines.

In addition, the thread take-up function of adjusting the pulling by passing the upper thread before sewing on the needle also has a length difference in accordance with the lifting trajectory difference of the needle bar. That is, the thread take-up length of the sewing machine for thick has a longer length so as to protrude more than the sewing machine for museums, and the stroke trajectory of the thread take-up is different depending on the length difference.

On the other hand, when the sewing machine is used, depending on the type of sewing material, either one for the thick material or the revolving mold for the museum may be used. In other words, when sewing leather or thick-thick sewing materials, a sewing machine for thick goods is used, and when sewing a thin stream of cloth, a sewing machine for museum is used. At home, people usually buy and use a sewing machine for the museum, but it is almost impossible to sew thick or tough sewing materials such as leather, and conversely, when using a sewing machine for sewing leather, etc., the speed and speed of the sewing machine I could not expect the benefits.

In this regard, the present inventor proposes a model variable and switching device of the sewing machine in order to eliminate the inconvenience of using the type of sewing machine selectively according to the type of sewing material.

The present invention was devised to solve the problems of the prior art, an object of the present invention, by adjusting the needle trajectory lifting trajectory and the trajectory of the thread take-up sewing machine according to the type of sewing material and sewing machine for the water The alternative is to solve the inconvenience of selecting and using.

Another object of the present invention is to adjust the needle bar lifting trajectory of the sewing machine for thick materials and the stroke trajectory of the thread take-up close to the sewing machine for museum to be used as a sewing machine for the museum.

Model variable and switching device of the sewing machine according to an embodiment of the present invention, the upper shaft rotates in the arm of the sewing machine, a crank rod mounted on the upper shaft to elevate the needle bar, following the lifting trajectory of the crank rod to adjust the pulling of the upper thread A sewing machine composed of a thread take-up crank and a thread take-up interlocked with the crank, having a stroke trajectory, the length of which is longer or shorter than the crank rod mounted on the upper axis of the sewing machine arm, and is mounted on the upper shaft. An alternative crank rod that replaces the crank rod that is provided to change the lifting trajectory of the needle bar; A replacement thread taker configured to have a long or short length difference compared to a thread taker adapted to have a stroke trajectory following the stroke of the crank rod to make a stroke trajectory following the lift trajectory of the replaced crank rod; Characterized in that.

In addition, the variable type and switching device of the sewing machine according to an embodiment of the present invention, the sewing machine is characterized in that the sewing machine for sewing materials or one of the sewing machine.

In addition, the variable type and the switching device of the sewing machine according to an embodiment of the present invention, the sewing machine is a sewing machine for thick goods, the length of the replacement crank rod to replace the crank rod of the sewing machine for water is 1 for the length of the crank rod of the sewing machine for water Characterized by the variable type and switching device of the sewing machine tailored on the basis of the length range of 1/2 to 2/3.

In addition, the variable type and switching device of the sewing machine according to an embodiment of the present invention, characterized in that the variable type and switching device of the sewing machine used a crank rod of the sewing machine for the museum as an alternative crank rod,

In addition, the variable type and switching device of the sewing machine according to an embodiment of the present invention, the length of the replacement thread take-up type of the sewing machine tailored on the basis of the length range of 1/2 to 2/3 with respect to the thread take-up length of the sewing machine for water It features variable and diverters.

In addition, the variable type and the switching device of the sewing machine according to an embodiment of the present invention, characterized in that the variable type and switching device of the sewing machine used the thread take-up of the sewing machine for the museum as a substitute thread take-up.

In addition, the variable type and the switching device of the sewing machine according to an embodiment of the present invention, the length of the replacement crank rod to replace the crank rod of the sewing machine for the museum is 1/2 to 2/3 of the crank rod length of the sewing machine for museum It is characterized by a variable type and switching device of the sewing machine further extended based on the length range.

In addition, the replacement crank rod of the variable type and the switching device of the sewing machine according to an embodiment of the present invention, characterized in that to use the crank rod of the sewing machine for water.

In addition, the length of the variable thread take-up variable of the sewing machine and the switching device according to an embodiment of the present invention is the length of the sewing machine further extended on the basis of the length range of 1/2 to 2/3 with respect to the length of the thread take-up of the sewing machine for museum It features variable and diverters.

In addition, the variable thread take-up of the variable and switching device of the sewing machine according to an embodiment of the present invention is characterized in that using the thread take-up of the sewing machine for water.

In addition, the variable type and switching device of the sewing machine according to an embodiment of the present invention, characterized in that any one of the thread take-up mounted on the sewing machine is mounted in a plurality of long or short than the other.

Model variable and switching device of the sewing machine according to an embodiment of the present invention, by adjusting the length of the crank rod and thread take-up of the sewing machine to vary the lifting trajectory of the needle bar and the stroke trajectory of the thread take-up. Through this, the model of the sewing machine is variable or provides model selectivity. Then, by adjusting the stroke trajectory of the thread take-up according to the needle bar lifting trajectory of the sewing machine, the sewing machine for thick materials can be used as a sewing machine for museums, and the sewing machine for museums can also be used for thick materials. And, the model can be used for common design, and improve the ease of use of the sewing machine.

1 is a side view of the needle bar and the take-up mechanism inside the sewing machine arm.

Figure 2 is a cross-sectional view showing a front portion of the sewing machine needle bar and thread take-up mechanism.

Figure 3 is a perspective view of the upper shaft and the needle bar and the take-up mechanism portion of the sewing machine.

Figure 4 is a side view of the needle bar and thread take-up mechanism inside the sewing machine arm adjusting the lifting trajectory of the needle bar and the stroke trajectory of the thread take-up according to an embodiment of the present invention.

5 is a partial front cross-sectional view of the needle bar and the thread take-up mechanism inside the sewing machine arm adjusting the lifting and lowering stroke trajectory of the needle bar according to an embodiment of the present invention.

6 is a comparative reference of the crank rod according to an embodiment of the present invention, (a) is a crank rod of a conventional sewing machine for thick goods, (b) is a replaced crank rod according to the present invention.

Figure 7 is a comparative reference of the thread take-up according to an embodiment of the present invention, (a) is a thread take-up and crank of the conventional sewing machine for thick, (b) is a replaced take-up and crank according to the present invention.

8 is a reference comparison of the operation of the sewing machine thread take-up according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiment of the present invention relates to a variable and switching device of the sewing machine by adjusting the lifting trajectory of the needle bar and the stroke trajectory of the thread take-up of the sewing machine to adjust the length of the crank rod and the length of the take-up machine to determine the lifting trajectory of the needle bar. By inducing a variable for the type or specification of the sewing machine already determined, thereby providing the selectivity to obtain the sewing characteristics exhibited in other models in one sewing machine. This will be described in detail through the sewing machine general driving mechanism of FIGS. 1 to 3. For reference, the general drive mechanism of sewing machine is a sewing machine for thick / museum that is divided into a type and a type of sewing machine, and the driving principle is the same or similar to each other. Therefore, the meaning of the sewing machine in the description of the present invention does not distinguish separately for sewing materials for the thick / museum. The necessary part describes a model limitedly.

1 is a side view of a needle bar and a thread take-up mechanism inside a sewing machine arm. Figure 2 is a cross-sectional view showing a part of the front of the sewing machine needle bar and thread take-up mechanism.

1 and 2, the left A direction is a face plate direction that is the tip of the sewing machine arm, and the right B direction is a pulley direction in which a pulley (not shown) is disposed. Inside the arm 111 of the sewing machine 100, the upper shaft 112 extending along the longitudinal direction of the arm 111 is rotatably supported by the sewing machine frame 113 of the sewing machine arm 111. The upper shaft 112 is rotated by the motor and the counterweight 114 is fixed to the end of the face plate A direction, and the counterweight 114 rotates together with the upper shaft 112. The counterweight 114 is formed with an eccentric hole which is eccentric with respect to the rotation center. The crank shaft 115 has a crank shape in which two shaft portions parallel to the upper shaft 112 protrude in the pulley direction and the face plate direction, respectively. The distal end portion of the shaft portion 116 protruding in the B direction with the pulley is fitted into the eccentric hole 117 and fixed. The shaft portion 118 on the face plate A direction side pivotally supports the upper end portion of the crank rod 120 of the needle bar 119. The amount of eccentricity from the center of rotation of the counterweight 114 is arranged such that the shaft portion 118 is larger than the shaft portion 116. The lower end of the needle bar crank rod 120 pivotally supports the shaft portion 121 protruding in parallel to the S-phase 112 in the pulley direction from near the center of the needle bar 119. The needle bar 119 is fixed to the arm 111 and is supported so as to be slidable in the vertical direction with respect to the needle bar upper and lower metals, and at the lower end, a sewing needle 122 for coordinating with a drum (not shown) to form stitching sweat is provided. It is fixed.

On the shaft portion 116 of the crank shaft 115, a thread take-up 124, through which the thread guide 123 through which the upper thread is inserted, is rotatably supported by the shaft portion 125. The end of the thread take-up crank 126 is supported to be rotatable with respect to the sewing machine frame by the thread take-up support shaft 127 parallel to the upper shaft 112. The distal end portion of the thread take-up crank 126 is rotatably connected to the middle portion of the thread take-up 124 by the shaft portion 125 projecting in the pulley direction.

The sewing machine drive mechanism works as follows. In FIG. 1, when the upper shaft 112 rotates clockwise, the counterweight 114 fixed thereto is also rotated. At this time, since the middle portion of the thread take-up 124 is connected to the thread take-up crank 126, the thread take-up crank 126 moves so as to move in the rotation range around the take-up support shaft 127. The movement is regulated to interlock with the counterweight (114). That is, when the end of the thread take-up 124 rotates on the rotational trajectory of the shaft portion 116 eccentric with respect to the rotation center of the counterweight 114, the thread guide 123 of the tip of the thread take-up 124 moves up and down. .

In addition, the movement speed of the take-up take-up 124 is the fastest when the shaft portion 116 passes near the take-up support shaft 127. When the upper shaft 112 rotates in the clockwise direction, the fastest time is when the thread take-up 124 rises. In general, when the thread take-up 124 is raised to tighten the thread of the needle, the faster the rising speed of the thread take-up 124 is suitable for sewing thick fabrics and the like.

On the other hand, since the upper part of the needle bar crank rod 120 rotates on the rotational trajectory of the shaft portion 116 eccentric with respect to the rotation center of the counterweight 114, the needle bar 119 connected to the lower part of the needle bar crank rod 120 is Move up and down.

In order to increase the vertical movement amount of the needle bar 119, the connection position of the needle bar crank rod 120 with respect to the counterweight 114 must be set to a position where the amount of eccentricity from the center of rotation of the counterweight 114 is large.

If the eccentric amount is large, since the movement trajectories of the needle bar crank rod 120 and the thread take-up crank 126 overlap and come into contact with each other when the sewing machine is driven, a problem arises in that the vertical movement amount of the needle bar 119 cannot be increased.

Particularly, in thick thick sewing machines, it is preferable to increase the needle bar as much as possible, because it is necessary to ensure as long as possible the waiting time for the needle to escape from the cloth in order to move the sewing material without difficulty. do.

In addition, although a large diameter bearing may be used to connect the rotating members in order to increase the speed of the sewing machine, a large diameter bearing may be used at the sewing machine frame side connection portion of the thread take-up crank 126 and the crank shaft connection portion of the needle bar crank rod. When used, since the diameter itself of each connecting portion is enlarged, it is impossible to use both connecting portions in contact with each other, and there is a problem in that the sewing machine can not be speeded up, and the position of the thread take-up support shaft 127 from the upper shaft 112 is increased. Although the method of separating in the direction can also be considered, in this case, since the shaft part 116 and the thread take-up support shaft 127 are spaced apart, the rising speed of the thread take-up 124 will become slow, and the thread tightening will worsen.

The length of the crank rod 120 applied to a sewing machine model for sewing a thick thick sewing material such as leather is a length of the crank rod 120 applied to a sewing machine model for sewing a sewing material such as thin cloth. It is set longer than that. That is, the crank rods used in the sewing machine for thick / museum are divided into different lengths, but the sewing machine for the thick is close to an industrial sewing machine, and the sewing machine for a museum is close to a domestic sewing machine, but the driving principle and operation of the mechanism are hardly different.

The difference between the long and short of the crank rod 120 is represented by the difference in waiting time of the needle coming out of the sewing material. In the sewing machine for sewing materials, such as leather, the length is longer than that of the crank rod 120 applied to the sewing machine for sewing because there is a need to secure a long moving time of the sewing material and increase the amount of the needle bar. The length of the crank rod 120 applied to the sewing machine for thick is longer than the length of the crank rod 120 applied to the sewing machine for museum. If the length of the crank rod is increased in the same sewing machine driving conditions, it has the advantage of sewing back sewing materials such as leather, while countering the high-speed driving suitable for thin cloth sewing materials. If the length of the crank rod is shortened, the needle bar cannot be lifted with a large force, and the waiting time of the needle bar is shortened, so sewing of sewing materials such as leather is difficult, but the speed is advantageous for sewing thin fabrics.

Looking at such a sewing machine driving mechanism, the length of the crank rod 'L1' is applied to the sewing machine for sewing materials such as thick leather and the sewing machine for sewing a relatively thin thickness of the heavens, etc. different. In case of the sewing machine for thick materials, the length of the crank rod length 'L1' is made for the sewing machine for the sewing machine. Compared to the sewing machine for thick material, it is applied to shorter length and is equipped to realize the speed and speed suitable for thin cloth bar.

Accordingly, when using a sewing machine, depending on the type of sewing material, the sewing machine for thick or thin material may be selected and used. In other words, when sewn leather or thick-thick sewing materials, a sewing machine for a thick material is used, and when sewing a thin cloth of a kind, the sewing machine for a thin material is selected and used. It is difficult to expect constant speed and speed.

On the other hand, the present invention, for example, in the case of a sewing machine model for the thick, by implementing the length of the thread take-up adjusting the pull of the crank rod and the upper thread mounted on the upper shaft to implement the constant speed and high speed of the needle sewing machine for the museum By varying the sewing machine model characteristics of the water to the sewing machine model characteristics of the water.

Since the crank rod is a part that the tip is linked to the upper axis and the end is combined with the needle bar to move freely in the arm, the long and long lengths within the allowable range of the free movement do not affect other peripheral drive parts. Only induce changes. The stroke trajectory of the thread take-up also represents the free movement outside the arm. Therefore, the application of the adjusted crank rod and the take-up itself alone does not directly affect the operation of the peripheral drive mechanism, and changes the sewing machine model for the museum to the sewing machine model or the sewing machine model for the sewing machine model It can be changed.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 4 to 7.

Figure 4 is a side view of the needle bar and thread take-up mechanism inside the sewing machine arm adjusting the lifting trajectory of the needle bar and the stroke trajectory of the thread take-up according to an embodiment of the present invention. 5 is a cross-sectional view showing a front portion of the needle bar and the thread take-up mechanism inside the sewing machine arm in which the lifting and lowering strokes of the needle bar according to the embodiment of the present invention are adjusted.

4 and 5, the sewing machine model is a sewing machine or a sewing machine for water. Or may be a sewing machine 200 is divided into industrial, household sewing machines and the like.

The present invention is configured by removing the crank rod applied to the general sewing machine 200 model and mounting a replacement crank rod 210 longer or shorter than the length of the corresponding crank rod. When the crank rod 210 replaced in this way is mounted on the upper shaft 112 of the sewing machine arm 111 to drive the upper shaft 112, the crank rod 210 mounted on the upper shaft 112 of the sewing machine arm 111 is a needle bar ( The elevation trajectory of 119) is made larger or smaller than in the beginning.

And, it comprises a replacement thread take-up 220 to make a stroke trajectory in accordance with the lifting trajectory of the replaced crank rod 210. The replaced thread take-up 220 forms a stroke trajectory following the lifting trajectory of the replaced crank rod 210.

When the crank rod 210 is mounted on the upper shaft 112 that rotates in the arm of the sewing machine by shortening or lengthening the length of the crank rod and the thread taker in the sewing machine model, the lifting trajectory of the needle bar 119 changes differently than before. In addition, the stroke trajectory of the thread take-up 220 for adjusting the pulling of the upper thread is also changed differently.

For example, in the case of a sewing machine for thick goods, if the previously installed crank rod 120 is removed and replaced with a crank rod 210 whose length is shortened instead, the lifting trajectory of the needle bar 119 becomes a stroke of the shortened crank rod. It decreases in proportion to the distance and speeds up. In other words, the sewing machine for the thick is switched to the dynamic movement close to the characteristics of the sewing machine for the museum.

Similarly, by removing the crank and thread take-up 124 mounted on the sewing machine for thick goods, and instead replace the thread take-up 220 with a shorter length, following the speed of the elevating trajectory of the

needle bar

119, 220 shows a faster stroke trajectory to move the upper thread pull tighter and faster. In other words, the sewing machine for thick is switched to a dynamic movement close to the sewing machine for museum.

Here, the sewing machine may be either a sewing machine for thick goods or a sewing machine for museums. In the sewing machine for thick goods, the length of the crank rod and the thread take-up is short. You can switch. It is preferable that more effects can be expected when the sewing machine for water is changed to a sewing machine for museums. For example, it is possible to implement a constant speed and speed that can be used to sew thin cloth using a sewing machine for thick.

In addition, the length of the replacement crank rod 210 to replace the crank rod 120 of the sewing machine for heavy goods on the basis of the length (L2) range of 1/2 to 2/3 with respect to the crank rod length (L1) of the sewing machine for heavy goods. It is preferable to fit, the replacement crank rod 220 is also possible to use the crank rod of the sewing machine for museums without the need to make or process separately.

In addition, the length L4 of the replacement thread take-up 220 is preferably adjusted to the length range of 1/2 to 2/3 with respect to the thread take-up length (L3) of the sewing machine for water. Alternative thread take-up 220 is also possible to use the thread take-up of the sewing machine for museums without the need to make or process separately.

In addition, since the lifting trajectory and the thread take-up stroke trajectory of the needle bar can be changed by adjusting the crank rod and the thread take-up, the common design of the sewing machine for thick / mold is also possible.

Figure 6 is a comparative reference of the crank rod according to an embodiment of the present invention, (a) is a crank rod of a conventional sewing machine for thick goods, (b) is a replaced crank rod according to the present invention.

Referring to Figure 6, (a) is the length (L1) of the crank rod 120 pre-installed in the sewing machine for thick, (b) is the length (L2) of the crank rod 210 is adjusted in length in accordance with the present invention Is shown comparatively. Here, the length L1 of the crank rod 120 provided previously: The length L2 of the crank rod 210 whose length was adjusted is L1> L2.

7 is a comparative reference of the thread take-up according to an embodiment of the present invention, (a) is a thread take-up and crank of the conventional sewing machine for thick materials, (b) is a replaced take-up and crank according to the present invention.

Referring to Figure 7, (a) is the length (L3) of the thread take-up 124 is installed on the sewing machine for water, (b) is the length (L4) of the length take-up 220 is adjusted according to the present invention. Here, the length L3 of the thread take-up threader 124 provided in advance: The length L4 of the thread take-up 220 whose length was adjusted is L3> L4.

8 is a reference comparison of the operation of the sewing machine thread take-up according to an embodiment of the present invention, referring to Figure 8, the thread take-up stroke trajectory of the sewing machine for thick material is t1, the length of the replaced take-up taker 220 is shortened The stroke trajectory is t2. Here, the replaced thread take-up 220 adjusts the pulling of the upper thread at a speed as fast as the time corresponding to t3. When the lifting trajectory of the needle bar is adjusted at a high speed, the upper thread is moved faster by the time of t3 in response to the speed change. Switch the sewing machine for thick goods by adjusting the pulling of.

According to an embodiment of the present invention, the thread take-up mounted on the sewing machine may be provided in plural rather than singular, and any one of the thread take-ups may be mounted longer or shorter than any other, and any one of the short or long thread take-ups may be selected and switched. Select one and thread the upper thread. If you want to use as a sewing machine for current museums, thread the thread in the thread take-up of the stroke trajectory, and if you want to use it as a sewing machine for the sewing thread, insert the thread in the thread take-up of the long stroke trajectory.

On the other hand, the embodiment of the present invention described with reference to Figures 6 to 8 has been described mainly for the example of converting the sewing machine for the after-mold sewing machine model, the specific example of changing the sewing machine for the museum to the sewing machine for the after-described example Since the adjustment and principle of the crank rod and the take-up presented are solved by adjusting the length and length, the specific example is omitted.

According to the model variable and the switching device of the sewing machine according to the embodiment of the present invention, by adjusting the length of the crank rod of the sewing machine to change the lifting trajectory of the needle bar and artificially vary the stroke trajectory of the sewing machine according to this Allows you to change, switch or select the model.

Although the present invention has been described with reference to one embodiment shown in the drawings, the present invention is not limited to the embodiment, and may be modified and modified within the scope not departing from the gist of the present invention. Included.

Claims

An upper shaft that rotates in the arm of a sewing machine, a crank rod mounted on the upper shaft and a needle bar for elevating the needle bar, a thread trajectory that moves with a stroke trajectory following the elevating trajectory of the crank rod to adjust the pulling of the upper thread, and a thread for interlocking with the crank. In the sewing machine consisting of a machine, a replacement crank configured to have a long or short length difference compared to the crank rod mounted on the upper shaft of the sewing machine arm to replace the crank rod mounted on the upper shaft to change the lifting trajectory of the needle bar road; An alternative thread take-up machine configured to have a longer or shorter length difference compared to a thread take-up adapted to have a corresponding stroke trajectory according to the stroke of the crank rod to create a variable stroke trajectory that interlocks with the lift trajectory of the replaced crank rod; Model variable and switching device of the sewing machine comprising a.
The method of claim 1,

The sewing machine is a variable sewing machine of the sewing machine which is either a sewing machine for water or a sewing machine for museum.
The method of claim 1,

The sewing machine is a sewing machine for heavy goods and the length of the replacement crank rod to replace the crank rod of the sewing machine for the sewing machine is variable of the type of sewing machine tailored based on the length range of 1/2 to 2/3 with respect to the length of the crank rod of the sewing machine for water And switching device.
The method of claim 1,

The replacement crank rod is a variable type and switching device of the sewing machine is a crank rod of the sewing machine for museum.
The method of claim 1,

The length of the replacement thread take-up of the variable type and switching device of the sewing machine to match the length range of 1/2 to 2/3 relative to the length of the thread take-up sewing machine for water.
The method of claim 1,

The alternative thread take-up is a variable type and switching device of the sewing machine is a thread take-up of the sewing machine for museums.
The method of claim 1,

The sewing machine is a sewing machine for the museum and the length of the replacement crank rod to replace the crank rod of the sewing machine for the sewing machine of the sewing machine further extended on the basis of the length range of 1/2 to 2/3 with respect to the crank rod length of the sewing machine for museum Variable and diverters.
The method of claim 1,

The replacement crank rod is a variable type and switching device of the sewing machine is a crank rod of the sewing machine for thick.
The method of claim 1,

The length of the replacement thread take-up is a variable type and switching device of the sewing machine further extended based on the length range of 1/2 to 2/3 with respect to the length of the thread take-up of the museum sewing machine.
The method of claim 1,

The alternate thread take-up device of the sewing machine variable and switching device that is a thread take-up of the sewing machine for thick water.
The method according to any one of claims 1 to 10,

Any one of the thread take-up that is mounted to the sewing machine is a variable type and switching device of the sewing machine equipped with a plurality of longer or shorter than the other one.