JPH08187385A - Sewing machine - Google Patents

Abstract

PURPOSE: To improve easiness for rounding cloth while keeping a present sewing machine size. CONSTITUTION: At a body part 18 of a sewing machine, a motor M is arranged so that a rotary shaft S can be perpendicular. A small pulley 28 is fixed at an upper end part Sa-of this rotary shaft S. The small pulley 28 is linked through a belt 32 to a large pulley 30 fixed downside a pulley shaft 30 parallel with the rotary shaft S. A worm 34a is fixed upside the pulley shaft 30. A worm wheel 34b to be engaged with the worm 34a is fixed to an upper shaft 12. Thus, by longitudinally arranging the motor M inside the body part 18 and laterally thinning the body part 18, the depth of the sewing machine is widened while keeping the present sewing machine size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine in which a motor for driving an upper shaft and a lower shaft is built in a machine frame of a sewing machine.

[0002]

2. Description of the Related Art Conventionally, in a domestic sewing machine SM as shown in FIG. 8, a needle bar P11 is provided in a sewing machine frame P10.
An upper shaft P12 for driving the like and a lower shaft P14 for driving a cloth feeding mechanism (not shown) are horizontally supported. An AC motor M (power consumption 50 to 8) is used as a motor for rotationally driving the upper shaft P12 and the lower shaft P14.
0 W, the length L1 is about 60 mm, and the length L2 is about 100 mm). Although the AC motor M is larger than the DC motor, it is cheap and easy to control, and therefore is used for a household sewing machine or the like, which requires a particular cost reduction.

The sewing machine frame P10 includes a bed portion P16 having a bed surface, a body portion P18 standing upright from the right end portion of the bed portion P16, and an arm portion extending leftward from the body portion P18 in the figure. P20 and. The AC motor M is provided at a joint portion between the bed portion P16 and the body portion P18, and is laterally arranged so that its rotation axis S is parallel to the upper axis P12 and the lower axis P14.

At the right end of the upper shaft P12, a deceleration pulley P22 and a dial P28 for manually rotating the upper shaft P12 are provided, and between the pulley P22 and the rotating shaft S of the AC motor M. The belt P24 is stretched. The rotation of the rotary shaft S is decelerated by the pulley P22 and the belt P24 and transmitted to the upper shaft P12. Also, the upper axis P
A belt P26 is also stretched between 12 and the lower shaft P14, and the rotation of the upper shaft P12 is transmitted to the lower shaft P14 via the belt P26. The AC motor M, the pulley P22, and the belts P24 and P26 described above are all arranged inside the sewing machine frame P10 in order to improve the appearance of the sewing machine SM.

[0005]

However, in the above-mentioned household sewing machine SM, since the large AC motor M is laterally arranged inside the sewing machine frame P10, the body portion P18 of the sewing machine frame P10 is It becomes thick. Further, in order to sufficiently reduce the speed of the upper shaft P12, it is necessary to use the pulley P22 having a large diameter.
The arm portion P20 also becomes thicker. However, due to market demand, the machine frame P10 does not want to be too expensive. Therefore, the edge of the sewing machine frame P10, that is, the portion surrounded by the bed portion P16, the body portion P18, and the arm portion P20 becomes narrow, so that the cloth cannot be easily handled during sewing, and the sewing machine becomes less convenient. Occurs.

The present invention has been made to solve the above-mentioned problems, and while using a large motor such as an AC motor,
The purpose of the present invention is to provide a sewing machine that is easy to use and has a wide space for the machine frame of the existing size.

[0007]

In order to achieve the above object, the invention of claim 1 is to provide an upper shaft and a lower shaft which are supported in parallel in a machine frame of the sewing machine, and the upper shaft and the lower shaft. In a sewing machine equipped with an AC motor for rotationally driving
It is characterized in that the AC motor is arranged inside a body portion connecting the bed portion and the arm portion of the sewing machine frame such that the rotation axis thereof is oriented in the vertical direction.

In the sewing machine having the above structure, the AC motor is arranged inside the body portion of the machine frame of the sewing machine so that the rotation axis of the sewing machine is oriented in the vertical direction. Is not restricted by the AC motor, and the body can be made thinner. Further, since the rotation shaft of the AC motor and the upper shaft or the lower shaft are arranged to intersect with each other, in transmitting the power of the AC motor to the upper shaft or the lower shaft, instead of the conventional belt or pulley,
Gears such as worm gears, hypoid gears, and screw gears can be used. With these gears,
Since a large reduction ratio can be obtained with a small gear volume, the arm portion of the sewing machine frame can be made thin.

Therefore, according to the sewing machine of the first aspect, the body and the arm of the machine frame of the sewing machine can be made thin even though a large AC motor is used, so that the sewing machine becomes large. It is possible to secure a wide open space. Therefore, the handling of the cloth becomes very easy,
Improves usability in sewing.

Here, in the invention of claim 1,
The rotating shaft of the AC motor and the upper shaft may be directly connected by a gear such as a worm gear, only the upper shaft may be directly driven to rotate by the motor, and the rotation of the upper shaft may be transmitted to the lower shaft by a belt. Alternatively, conversely, only the lower shaft may be directly driven to rotate by the AC motor, and the rotation of the lower shaft may be transmitted to the upper shaft by the belt.

However, in such a case, it is necessary to pass the belt connecting the upper shaft and the lower shaft inside the body portion of the machine frame of the sewing machine, and the body portion becomes thicker accordingly.
There is a problem that the area becomes a little narrow. Further, particularly in the case of a sewing machine, for example, a needle is moved up and down by an upper shaft, and a lower shaft drives a cloth feed tooth or the like for sewing, and a V belt or a friction belt is used between the upper shaft and the lower shaft. When the shafts of No. 1 and No. 2 are rotated in synchronization with each other, the rotating upper shaft or lower shaft may slip on the belt, and the synchronism of rotation between the upper shaft and the lower shaft may deteriorate.

Therefore, in order to solve the above problems, as described in claim 2, in the sewing machine according to claim 1, as the AC motor, the rotary shaft is located above the motor body and By using a double shaft motor protruding to both lower sides, the upper end of the rotary shaft and the upper shaft are connected by a gear, and the lower end of the rotary shaft and the lower shaft are connected by a gear, It is desirable that both the shaft and the lower shaft be directly rotationally driven by the double shaft motor.

According to this structure, it is not necessary to bridge the belt for transmitting the rotation between the upper shaft and the lower shaft, and it is not necessary to pass the belt inside the body portion of the machine frame of the sewing machine. Therefore, the body portion can be made thinner by that amount, and the space can be made wider than in the case of claim 1.

Since both the upper shaft and the lower shaft are connected by gears to one rotating shaft of the two-shaft motor and both the upper shaft and the lower shaft are simultaneously driven to rotate by a common rotating shaft, The upper shaft and the lower shaft can be reliably driven to rotate in synchronization with each other. By the way, in the above claims 1 and 2, when the upper shaft or the lower shaft and the rotating shaft of the motor are directly connected by a gear,
The heat generated by the motor is transmitted to the gear, and when a resin gear is used, the gear may be thermally deformed. Therefore, it is necessary to use an expensive metal gear, which increases the cost. Further, when the gears are directly connected as described above, the gears are affected by the vibration of the motor rotating shaft and the misalignment of the shaft center, and the noise and the vibration are increased.

Therefore, in order to solve such a problem, it is desirable to adopt the structure as described in claim 3. That is, the invention of claim 3 is a sewing machine including an upper shaft and a lower shaft supported in parallel in a machine frame of the sewing machine, and a motor for rotationally driving the upper shaft and the lower shaft. The pulley shaft is arranged inside the body portion that connects the bed portion and the arm portion of the sewing machine frame so that the rotation shaft thereof is oriented in the vertical direction, and a pulley shaft parallel to the rotation shaft of the motor is provided. A belt for transmitting the power of the rotating shaft to the pulley shaft, and one or both of the upper shaft and the lower shaft and the pulley shaft by a gear. It is characterized by being connected.

In the sewing machine having the above structure, the belt and the pulley shaft are interposed between the rotary shaft of the motor and the upper shaft or the lower shaft, so that heat generated from the motor is generated by the upper shaft or the lower shaft. Hard to be transmitted to the gear that connects the lower shaft and the intermediate shaft. Therefore, an inexpensive resin gear can be used,
The cost of the device can be reduced. Also, since the vibration of the motor shaft and the shaft misalignment are absorbed by the belt,
Generation of noise and vibration is suppressed.

Here, in the third aspect, only the upper shaft may be rotationally driven by the pulley shaft, and the rotation of the upper shaft may be transmitted to the lower shaft by the belt. Conversely, only the lower shaft may be rotationally driven by the pulley shaft, and the rotation of the lower shaft may be transmitted to the upper shaft by the belt. However, in the case as described above, it is necessary to pass the belt connecting the upper shaft and the lower shaft inside the body portion of the sewing machine frame, and the body portion becomes thicker by that amount,
There is a problem that the area becomes a little narrow. Further, when the upper shaft and the lower shaft are connected by a belt, the upper shaft and the lower shaft may slip with respect to the belt, and the synchronism of rotation of the upper shaft and the lower shaft may deteriorate.

Therefore, in order to solve such a problem, it is desirable to adopt the structure as described in claim 4. That is, the invention of claim 4 is a sewing machine including an upper shaft and a lower shaft that are supported in parallel in a sewing machine frame, and a motor for rotationally driving the upper shaft and the lower shaft. A biaxial motor whose rotary shaft protrudes to both the upper side and the lower side of the motor main body is used, and the motor is connected to the bed section and the arm section of the sewing machine frame so that the rotary axis is oriented in the vertical direction. And an upper pulley shaft and a lower pulley shaft that are parallel to the rotation shaft of the motor, and a belt is bridged between the upper pulley shaft and the upper end of the rotation shaft of the motor. A belt is spanned between the lower pulley shaft and the lower end of the rotary shaft of the motor, the upper pulley shaft and the upper shaft are connected by gears, and the lower pulley shaft and the lower shaft are connected. Is characterized by being connected by gears.

In the sewing machine of the fourth aspect having the above structure, as in the case of the second aspect, the belt for connecting the upper shaft and the lower shaft is not required, and the belt or the pulley shaft is used for the body portion of the machine frame. Since it is not necessary to pass it through the inside of the sewing machine, the body portion can be made thinner by that amount, and the sewing machine can be further widened. Further, since both the upper shaft and the lower shaft are simultaneously driven to rotate by the single rotating shaft of the double shaft motor, the synchronism of rotation of the upper shaft and the lower shaft is improved.

Here, the gears in the third and fourth aspects are not particularly limited as long as the rotation of the pulley shaft can be transmitted, and for example, a bevel gear or the like can be used.
However, in order to make the arm portion of the machine frame thin, it is preferable that the gear is a worm gear, a hypoid gear, or a screw gear, as described in claim 5. When these gears are used, a gear having a small volume can be used to obtain a large reduction ratio, so that the arm portion of the machine frame of the sewing machine can be made even thinner and the space can be widened. Further, the noise generated from the gears is small, and the operating noise of the sewing machine can be reduced. In addition,
Of these gears, especially the worm gear,
Gears are preferable because they are easy to manufacture and inexpensive.

In the inventions of claims 3 to 5, it is not always necessary to decelerate between the rotary shaft of the motor and the pulley shaft. However, when deceleration is not performed in this portion, it is necessary to increase the reduction ratio of the gear that connects the upper shaft and the lower shaft to the pulley shaft. Therefore, for example, when a bevel gear is used as the gear, it is necessary to use a gear having a large diameter, and the arm portion of the sewing machine frame becomes thicker accordingly.

Further, particularly when the worm gear, the hypoid gear, or the screw gear is used as the gear as in the fifth aspect, if the reduction ratio of these gears is made too large, the upper shaft can be manually rotated. It will be difficult. That is, in the conventional sewing machine, for example, in order to manually move the needle position up and down, the dial connected to the upper shaft may be manually rotated to rotate the upper shaft manually, but the reduction ratio of the worm gear is If it is too large, a large force is required to rotate the gear due to the characteristics of the gear, and it becomes difficult to manually rotate the upper shaft.

Therefore, in order to solve such a problem, as described in claim 6, deceleration of the upper shaft and the lower shaft is performed between the rotation shaft of the motor and the pulley shaft. It is desirable to perform the deceleration between the pulley shaft and the upper and lower shafts in two stages. According to this, by performing the deceleration in two stages, the reduction ratio of the gear that connects the pulley shaft and the upper shaft or the lower shaft can be set small. Therefore, when the bevel gear is used, the gear can be downsized and the arm portion can be thinned. Also,
In particular, when a worm gear, a hypoid gear, or a screw gear is used, a gear having a small reduction ratio can be used, so that the upper shaft can be easily rotated manually.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. First, the first embodiment will be described. FIG.
2 is a front view showing a schematic configuration of the household sewing machine of the first embodiment, and FIG. 2 is a right side view of the same.

The household sewing machine SM includes an upper shaft 12 for driving a needle bar 11 and the like, a lower shaft 14 for driving a cloth feeding mechanism (not shown), and the like inside a sewing machine frame 10. Axis 1
An AC motor M for driving the lower shaft 14 and the lower shaft 14, and a transmission mechanism 15 for transmitting the rotational force of the AC motor M to the upper shaft 12 are provided. The AC motor M has a power consumption of 50 to 80 W and a length L1 shown in FIG. 2 of about 60 m.
m and L2 are about 100 mm.

The sewing machine frame 10 includes a bed portion 16 having a flat bed surface 16a formed on an upper portion thereof, and the bed portion 16 thereof.
And a body portion 18 vertically provided at the right end of the body and an arm portion 20 extending horizontally from the body portion 18 to the left in the drawing. In addition, like a conventional household sewing machine,
The bed portion 16 is provided with a cloth feed mechanism (not shown) for driving a feed dog that feeds cloth, and the cloth feed mechanism is driven according to the rotation of the lower shaft 14. Also,
The arm portion 20 has a needle bar 1 having a sewing needle 22 attached to the lower end thereof.
A needle bar drive mechanism (not shown) for moving up and down 1 is provided, and this needle bar drive mechanism is driven according to the rotation of the upper shaft 12.

The upper shaft 12 is the arm portion 2 of the sewing machine frame 10.
It is horizontally supported inside 0, and a dial 24 for manually rotating the upper shaft 12 is attached to the right end portion thereof. On the other hand, the lower shaft 14 is horizontally supported inside the bed portion 16 of the sewing machine frame 10. A timing belt 26 (hereinafter referred to as “belt 26”) is stretched between the upper shaft 12 and the lower shaft 14, and the rotation of the upper shaft 12 is transmitted to the lower shaft 14 by the belt 26. . The belt 26 is passed through the body portion 18 of the sewing machine frame 10.

The AC motor M is arranged inside the body portion 18 of the sewing machine frame 10 so that its rotation axis S is oriented in the vertical direction, and a small pulley 28 is provided at the upper end Sa of the rotation axis S.
Is attached. The transmission mechanism 15 that transmits the rotational force of the motor M to the upper shaft 12 has a pulley shaft 30 extending in the vertical direction, and a belt 32 spanned between the pulley shaft 30 and the small pulley 28 of the rotation shaft S. And a worm gear 34 that connects the upper shaft 12 and the pulley shaft 30.

As shown in FIG. 3, the pulley shaft 30 is rotatably attached to a bearing portion 36 provided in the sewing machine frame 10, and has a large pulley 30a at its lower end.
Is attached. The diameter of the large pulley 30a is larger than the diameter of the small pulley 28 on the motor M side,
As a result, deceleration is performed between the rotation shaft S of the motor M and the pulley shaft 30. The worm gear 34 is composed of a worm 34a fixed to the upper end portion of the pulley shaft 30 and a worm wheel 34b fixed to the upper shaft 12 and meshed with the worm 34a. Will be decelerated. The speed reduction ratio of the worm gear 34 is set to such a value that the upper shaft 12 can be easily rotated manually by turning the dial 24 by hand.

In the household sewing machine SM having the above structure, when the AC motor M is rotationally driven, the rotation of the rotary shaft S is transmitted to the pulley shaft 30, and the pulley shaft 30 is rotationally driven at a predetermined reduction ratio. Then, the rotation of the pulley shaft 30 is transmitted to the upper shaft 12 at a predetermined reduction ratio via the worm gear 34, and the upper shaft 12 is rotationally driven. Further, the rotation of the upper shaft 12 is transmitted to the lower shaft 14 via the belt 26, and the lower shaft 14 rotates in synchronization with the upper shaft 12 at the same speed.

As described in detail above, in the domestic sewing machine SM of the first embodiment, the large AC motor M is arranged inside the body portion 18 so that the rotation axis S thereof is oriented in the vertical direction. Therefore, the body portion 18 can be made thinner than in the case where the motor M is laterally arranged as in the conventional case.
Further, in transmitting the power of the motor M to the upper shaft 12, since the worm gear 34 having a small volume is used without attaching the large-sized pulley as described in the conventional art to the upper shaft 12, the arm portion 20 is made thin. can do. Therefore, despite using the large AC motor M,
This makes it possible to secure a wide space, which makes it very easy to handle the cloth and improves the usability in sewing.

Further, according to this embodiment, the belt 32 and the pulley shaft 30 are provided between the rotating shaft S of the motor M and the upper shaft 12.
The heat generated by the motor M is less likely to be transmitted to the worm gear 34 because of the interposition of. Therefore, even when the inexpensive worm gear 34 made of resin is used, the worm gear 34 is not thermally deformed, so that the cost of the device can be reduced. Further, since the vibration and the axial deviation of the rotating shaft S are absorbed by the belt 32, the worm gear 34 is not affected by the vibration and the axial deviation of the rotating shaft S, and the noise and the vibration are suppressed.

Further, in this embodiment, the deceleration of the upper shaft 12 is
The deceleration between the rotation shaft S of the motor M and the pulley shaft 30 and the deceleration by the worm gear 34 are performed in two stages. Therefore, since the worm gear 34 having a small reduction ratio can be used, the upper shaft 12 can be easily rotated manually.

Next, the second embodiment will be described. Here, FIG. 4 is a front view showing a schematic configuration of the domestic sewing machine of the second embodiment, and FIG. 5 is a right side view of the same. The first
The same parts as those in the embodiment are denoted by 10 in the reference numerals of the first embodiment.
The reference numeral with 0 added is attached and detailed description is omitted.

The home sewing machine SM 'of the second embodiment is different from that of the first embodiment in that a double shaft motor M'is used as an AC motor, and not only the upper shaft 112 but also the lower shaft 114 has a pulley shaft. It is a point that is rotationally driven using 131 and the belt 133. Here, in the dual shaft motor M ′, one rotary shaft S ′ is projected to both the upper side and the lower side of the motor body, and the rotary shaft S ′ is arranged in the vertical direction as in the first embodiment. It is arranged inside the body portion 118 of the machine frame 110 so as to face.

Transmission mechanisms 115, 115 'similar to the transmission mechanism 15 of the first embodiment are provided at the upper end Sa and the lower end Sb of the rotary shaft S'. That is, the small pulleys 128 and 129 similar to those of the first embodiment are attached to the upper end Sa and the lower end Sb of the rotary shaft S ′, respectively, and the upper pulley shaft 130 and the lower pulley similar to those of the first embodiment. A shaft 131 is provided. Upper pulley shaft 13
An upper belt 132 is stretched between the large pulley 130a of 0 and the small pulley 128 of the upper end Sa of the rotating shaft S ′.
A lower belt 133 is stretched between the lower pulley shaft 131 and the small pulley 129 at the lower end Sb of the rotating shaft S ′. Then, the upper pulley shaft 130 and the upper shaft 112 are
A worm gear 134 similar to that of the embodiment is connected, and a lower pulley shaft 131 and a lower shaft 114 are also connected by a worm gear 135.

In the household sewing machine SM 'having the above-described structure, when the double shaft motor M'is rotationally driven, the rotation of the rotary shaft S'is transmitted to the upper shaft 112 via the upper pulley shaft 130 and the upper belt 132. The upper shaft 112 is rotationally driven at a predetermined reduction ratio. At the same time, the rotary shaft S ′ is moved through the lower pulley shaft 131 and the lower belt 133.
Is transmitted to the lower shaft 114, and the lower shaft 114
It is driven to rotate at the same rotation speed as 2.

As described in detail above, also in the household sewing machine SM 'of the second embodiment, as in the first embodiment, the double shaft motor M'is arranged so that its rotation axis S'is oriented in the vertical direction. ,
Since it is arranged inside the body portion 118 of the sewing machine frame 110, it is possible to make the body portion 118 and the arm portion 120 thin and wide the space, as in the first embodiment.
Therefore, there is an effect that usability is improved.

Further, in the second embodiment, it is not necessary to provide a belt (the belt 26 of the first embodiment) for transmitting the rotation between the upper shaft 112 and the lower shaft 114, so that the body is correspondingly increased. There is an advantage that the portion 118 can be made thin and the edge of the sewing machine can be made wider.

Although the embodiments have been described above, the present invention is not limited to the above embodiments and can be implemented in various modes. For example, in the first embodiment, only the upper shaft 12 is driven by the pulley shaft 30, but conversely, only the lower shaft 14 is driven by the pulley shaft, and the rotation of the lower shaft 14 is transferred to the upper shaft 12 by the belt 26. It can also be configured to communicate.

Further, in the first embodiment, the pulley shaft 30
The lower end of the shaft is extended to the position of the lower shaft 14, the pulley shaft 30 and the lower end of the lower shaft 14 are connected by a worm gear, and both the upper shaft 12 and the lower shaft 14 are rotationally driven by one pulley shaft 30. May be. Further, when the double shaft motor M'is used as in the second embodiment, the pulley shafts 130 and 131 and the belts 132 and 133 are not provided, and the upper end portion Sa of the rotary shaft S'is not provided.
The upper shaft 112 and the upper shaft 112 may be directly connected by the worm gear 134, and the lower end Sb of the rotating shaft S ′ and the lower shaft 114 may be directly connected by the worm gear 135. In this case as well, it is not necessary to provide the belt 26 that connects the upper shaft 112 and the lower shaft 114, so that the body portion 118 can be made thinner by that much and the space can be made wider.

In the first and second embodiments, instead of the worm gear, hypoid gears 61 and 63 as shown in FIGS. 6A and 6B may be used. Also, FIG.
You may use the screw gears 65 and 67 as shown to (A) and (B). In any case, as with the worm gear, a large reduction ratio can be obtained with a small gear volume,
The arms of the machine frame can be made narrower to make the space wider. Further, since the noise generated by the gear is small, the operating noise of the sewing machine is small.

In the first and second embodiments, the motor is
Although the rotating shaft is arranged so as to be oriented in the vertical direction, the present invention is not limited to this. For example, when the body portion of the machine frame of the sewing machine has a shape extending in an oblique direction, the rotating shaft of the motor is You may arrange | position inside a body part so that it may face diagonally.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a household sewing machine according to a first embodiment.

FIG. 2 is a side view showing a schematic configuration of the domestic sewing machine of the first embodiment.

FIG. 3 is a perspective view showing a transmission mechanism of the first embodiment.

FIG. 4 is a front view showing a schematic configuration of a household sewing machine according to a second embodiment.

FIG. 5 is a side view showing a schematic configuration of a household sewing machine according to a second embodiment.

FIG. 6 is a perspective view showing a transmission mechanism of another embodiment.

FIG. 7 is a perspective view showing a transmission mechanism of another embodiment.

FIG. 8 is a front view showing a conventional technique.

[Explanation of symbols]

SM, SM '... Household sewing machine M ... AC motor M' ... Double shaft motor S, S '... Rotating shaft 10,110 ... Sewing machine frame 12, 112 ... Upper shaft 14,114 ... Lower shaft 16,116 ... Bed section 18, 118 ... Body part 20, 120 ... Arm part 30, 130, 1
31 ... Pulley shaft 32, 132, 133 ... Belt 34, 134, 1
35 ... Worm gear 61, 63 ... Hypoid gear 65, 67 ... Screw gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takahiro Yamada 15-1 Naedai-cho, Mizuho-ku, Nagoya-shi, Aichi Brother Industry Co., Ltd. No. 1 Brother Industries, Ltd.

Claims (6)

[Claims] 1. A sewing machine including an upper shaft and a lower shaft supported in parallel in a machine frame of the sewing machine, and an AC motor for rotationally driving the upper shaft and the lower shaft. A sewing machine, characterized in that it is arranged inside a body portion that connects the bed portion and the arm portion of the sewing machine frame so that the axis thereof is oriented in the vertical direction. 2. As the AC motor, a biaxial motor in which the rotary shaft projects to both the upper side and the lower side of the motor body is used, and an upper end portion of the rotary shaft and the upper shaft are connected by a gear, 2. The sewing machine according to claim 1, wherein the lower end of the rotary shaft and the lower shaft are connected by a gear, and both the upper shaft and the lower shaft are directly rotationally driven by the double shaft motor. 3. A sewing machine comprising an upper shaft and a lower shaft supported in parallel in a machine frame of the sewing machine, and a motor for rotationally driving the upper shaft and the lower shaft, wherein the rotation shaft of the motor is It is arranged inside the body part that connects the bed part and the arm part of the sewing machine frame so as to face in the vertical direction, and a pulley shaft parallel to the rotation shaft of the motor is provided, and the pulley shaft and the motor A belt for transmitting the power of the rotating shaft to the pulley shaft is spanned between the rotating shaft and one or both of the upper shaft and the lower shaft and the pulley shaft are connected by a gear. The characteristic sewing machine. 4. A sewing machine comprising an upper shaft and a lower shaft supported in parallel in a machine frame of the sewing machine, and a motor for rotationally driving the upper shaft and the lower shaft, wherein the rotating shaft is the motor. A biaxial motor that protrudes on both the upper side and the lower side of the motor main body is used, and the motor is provided in a body portion that connects the bed portion and the arm portion of the sewing machine frame so that the rotation shaft is oriented in the vertical direction. An upper pulley shaft and a lower pulley shaft that are arranged inside and parallel to the rotation shaft of the motor are provided, and a belt is bridged between the upper pulley shaft and the upper end of the rotation shaft of the motor, and the lower pulley shaft is provided. A belt is bridged between the pulley shaft and the lower end of the rotating shaft of the motor, the upper pulley shaft and the upper shaft are connected by a gear, and the lower pulley shaft and the lower shaft are connected by a gear. A sewing machine characterized by what it has done. 5. The gear according to claim 3, wherein the gear is a worm gear, a hypoid gear, or a screw gear.
Or the sewing machine described in 4 above. 6. The deceleration of the upper shaft and the lower shaft is performed in two stages of deceleration between the rotation shaft of the motor and the pulley shaft and deceleration between the pulley shaft and the upper shaft and the lower shaft. The sewing machine according to any one of claims 3 to 5, which is performed.