JPH11333179A - Drive device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device of sewing machine which facilitates the layout of other drive mechanisms by reducing the occupation space of a drive force transmission device transmitting the drive force from the upper shaft to the lower shaft in the sewing machine body. SOLUTION: In a sewing machine which is provided with an upper shaft 1 connected to a motor 4 by a coupling 5 almost coascially and a lower shaft 6 which moves interlocking with the drive of the upper shaft 1, a drive force transmission device which transmits a drive force from the upper shaft 1 to the lower shaft 6 is provided. The drive force transmission device is provided with bevel gears at the top and bottom. One is a bevel gear 16 which is provided close to a vertical shaft 20 transmitting drive force from the upper shaft 1 to the lower shaft 6 and a coupling 6 of the upper shaft 1, and connects the upper shaft 1 to the vertical shaft 20 so as to transmit a drive force from the upper shaft 1 to the vertical shaft 20. The other one is a bevel gear 17 which transmits a drive force from the vertical shaft 20 to the lower shaft 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a sewing machine, and more particularly, to a driving device for a sewing machine having an upper shaft and a lower shaft, one of which serves as an output shaft and the other shaft for driving the output shaft. The present invention relates to a driving device for a sewing machine including a driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft as a driven shaft interlocked with the driving shaft.

[0002]

2. Description of the Related Art Conventionally, in a sewing machine having an upper shaft for driving a needle and a lower shaft for driving a shuttle, a motor is connected to an upper shaft, and the upper shaft is used as an output shaft of the sewing machine. A motor is provided below the table on which the sewing machine body is installed, and a pulley is attached to each of the motor shaft and the upper shaft. The sewing machine was driven by interlocking with such as. The operation of the motor was controlled by a pedal provided at the lower part of the table.

In such a sewing machine, a motor for driving the sewing machine is provided on a table on which the sewing machine body is mounted. After installation on the table, it was necessary to attach a V-belt to the pulley of the motor shaft and the pulley of the upper shaft, and the work was troublesome. However, in recent years, since the motor has been controlled electrically and downsized,
The motor can be mounted on the frame of the sewing machine, which simplifies the work of setting up the mounting of the sewing machine body as described above.

FIGS. 3 and 4 are longitudinal sectional views of a conventional sewing machine in which a motor is mounted on the above-described sewing machine frame, respectively. In the sewing machine shown in FIG.
A bed 50a having a flat bed surface on the upper surface, and a vertical trunk 50b standing on one end side of the bed 50a;
An arm 50c extending substantially in parallel with the bed 50a from above the vertical body 50b, has a substantially U-shape in a side view, and is disposed in the arm 50c.
7 is driven by a timing belt 53, and is linked with a sewing machine motor 52 provided on the vertical body portion 50b by a bevel gear.
, The lower shaft 55 arranged in the bed 50a is rotated to move the shuttle 56 in the bed 50a.

The sewing machine shown in FIG. 4 is a sewing machine provided with a half-turn shuttle, and has a bed 6 similar to the sewing machine shown in FIG.
0a, a vertical torso 60b, and an arm 60c, the sewing machine frame 60 having a substantially U-shape in side view, and an upper shaft 61 in the arm 60c and a bed 60a.
A lower shaft 62 for driving a half-turn shuttle (not shown) is provided therein.
Are arranged. The sewing machine motor 63 for driving the upper shaft 61 of the sewing machine has an upper shaft 61 such that the axis of the sewing machine motor 63 is the same as the axis of the upper shaft 61.
Is attached via a coupling 64 to the end portion 61a of the main body. The sewing machine motor 63 is mounted on the rear end face 60d of the sewing machine frame 60 with the axis inserted from the outside to the inside.

[0006] The upper shaft 61 is provided with a coupling 64.
A bearing 65 for supporting the upper shaft 61 is externally fitted to a portion adjacent to the upper shaft 61, and a crank for transmitting the driving force of the upper shaft 61 to the lower shaft 62 at a substantially central portion of the upper shaft 61 in the vertical trunk portion 60b. A part 66 is formed. When the crank rod 66a of the crank portion 66 moves up and down, the lower shaft 62 swings, and the swing rotates the half turn. Then, the crank part 66 and the bearing 65
A crank balancer 67 for locally balancing the crank portion 66 is externally fitted to the upper shaft 61. The mechanism by which the lower shaft 62 swings due to the vertical movement of the crank rod 66a is a well-known technique, and a description thereof will be omitted.

[0007]

However, in the structure of these conventional sewing machines, the mechanism for transmitting the driving force from the upper shaft to the lower shaft has a dimension in the extending direction of the upper shaft, so that the vertical trunk portion 50b , 60b. That is, in the sewing machine shown in FIG.
And a gear portion 59 for rotating a vertical shaft 54 interlocked with a lower shaft 55 is provided. A pulley 52a attached to a shaft of the sewing machine motor 52 in the portion 50b is provided, and these members occupy a large space in the vertical trunk portion 50b. In particular, in this configuration, the vertical shaft 54 cuts through a substantially central portion in the vertical trunk 50b, and the space in the vertical trunk 50b is separated by the vertical shaft 54 and the timing belt 53.

Similarly, in the sewing machine shown in FIG. 4, the axis of the sewing machine motor 63 is arranged on the same axis as the upper shaft 61.
In the vertical trunk portion 60b, in order from the rear of the sewing machine, a coupling 64, a bearing portion 65 which is externally fitted to the upper shaft 61 adjacent to the coupling 64, the above-described crank balancer 67, and a crank portion 66 are provided. These members are dimensioned in the direction in which the upper shaft extends due to these members, and the crank rod 66a has a structure in which the crank rod 66a extends substantially at the center in the vertical trunk portion 60b. For this reason, for example, the sewing machine sends a needle swing mechanism that swings a needle that is driven up and down by an upper shaft to the left and right in a vertical trunk portion like a buttonhole overlock sewing machine, and a sewing cloth in the extending direction of the sewing machine bed. When another driving mechanism such as a cloth feeding mechanism is provided, the layout is troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine having a driving force transmitting means for transmitting a driving force from an upper shaft to a lower shaft. To provide a sewing machine driving device which facilitates the layout of the sewing machine.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to a first aspect of the present invention is to provide a motor, comprising: an upper shaft and a lower shaft of a sewing machine; And the output shaft is connected almost on the same axis,
The other shaft is a driven shaft that is interlocked with the driving of the output shaft, and comprises a driving force transmission unit that transmits a driving force from the output shaft to the driven shaft.The driving force transmission unit is configured to transmit the driving force from the output shaft to the driven shaft. A driving force transmitting member for transmitting a driving force to a driven shaft; and a driving force transmitting member provided at a portion of the output shaft adjacent to the coupling, wherein the output shaft and the driving force transmitting member are moved from the output shaft to the driving force transmitting member. And an output shaft transmission portion connected to the driven shaft in a state of transmitting a driving force, and a driven shaft transmission portion provided on the driven shaft and transmitting a driving force from the driving force transmission member to the driven shaft.

Specifically, the upper shaft is for driving the needle, and the lower shaft is generally for driving the shuttle. Note that the lower shaft is not limited to one that drives the shuttle. The coupling is a joint that connects the motor to one of the upper shaft and the lower shaft and can transmit the driving force of the motor to the upper shaft. Even when the axes are displaced from each other, a cushion portion that bends and absorbs the deviation of the axes is provided between the fixing portions that fix the respective axes. The shape may be configured in any manner.

Further, the driving force transmission means may be formed so as to transmit driving force from the upper shaft or lower shaft serving as the output shaft to the upper shaft or lower shaft serving as a driven shaft. The output shaft transmission unit and the driven shaft transmission unit may be a rotating body that rotates with the rotation of the output shaft provided, and the driving force transmission member may be configured as an output shaft transmission unit. The driving force transmission member may be configured to rotate with the rotation, and the driven shaft transmission unit may be configured to rotate by rotation of the driving force transmission member.

For example, the output shaft transmission portion is a gear provided on the output shaft, the driven shaft transmission portion is a gear provided on the driven shaft, and the driving force transmission members are provided at both ends of the main drive shaft. And a shaft provided with a gear that meshes in a state orthogonal to the gear provided on each of the driven shafts. Further, the driving force transmission member may be an annular flexible member such as a belt or a chain, and the output shaft transmission portion and the driven shaft transmission portion may be pulleys or sprockets, respectively. When the driving force transmission member is a belt, the belt is a toothed belt,
It is preferable that the pulley is a toothed pulley correspondingly.

According to the first aspect of the present invention, one of the upper shaft and the lower shaft is an output shaft that is connected on a substantially same axis with the motor by a coupling, and the other shaft is the output shaft. In the driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft, the output shaft transmitting portion is provided at a portion adjacent to the coupling of the output shaft. Therefore, the driving force transmission member to which the driving force from the output shaft is transmitted via the output shaft transmission portion is disposed near the coupling. That is, the driving force transmission means is disposed near the coupling that connects the motor and the output shaft,
Unlike the related art, a large space is formed adjacent to the driving force transmitting means by the reduced distance between the coupling and the driving force transmitting means. For example, when the coupling is arranged at the rear end of the sewing machine and the upper shaft and the motor are connected via the coupling, the driving force transmission means is arranged at the rear side of the sewing machine. Thus, the space on the front side of the driving force transmission means in the sewing machine main body is widened. Therefore, when other driving mechanisms such as a needle swing mechanism and a cloth feeding mechanism are arranged in this space, the layout can be easily performed.

Further, when adjusting various driving mechanisms provided in the sewing machine main body, the adjustment is performed from the opening provided on the side surface of the vertical trunk portion. Further, since the output shaft transmission portion of the driving force transmission means for transmitting a driving force from the output shaft to the driven shaft is provided in a portion of the output shaft adjacent to the coupling,
The number of bearings for supporting the output shaft can be reduced as compared with the case where the output shaft transmission is provided at a portion of the output shaft remote from the coupling.

According to a second aspect of the present invention, in the driving apparatus for a sewing machine according to the first aspect, the driving force transmitting member is disposed between the coupling and the driven shaft, and is provided via the output shaft transmitting portion. Thus, the driving force is transmitted from the output shaft, and the driving force is transmitted to the driven shaft via the driven shaft transmission portion.

According to the second aspect of the invention, the same effect as that of the first aspect can be obtained, and the driving force transmission member is disposed between the coupling and the driven shaft. Therefore, the space formed adjacent to the driving force transmission means is wider than that of the first aspect. Therefore, the space formed adjacent to the driving force transmitting means can be effectively used.

More specifically, the output shaft transmission portion and the driven shaft transmission portion are gears that rotate in accordance with the rotation of the shafts provided respectively. This is a configuration in which the shaft meshes with the gear provided on the shaft. In this case, the gear is preferably a bevel gear. That is, a bevel gear for an output shaft is provided on a portion of the output shaft adjacent to the coupling toward the coupling, and a bevel gear is provided on a portion of the driven shaft at a position opposed to the position of the bevel gear, and the output shaft is A driven shaft bevel gear is attached in the same manner as the bevel gear, and shafts provided with bevel gears at both ends are arranged so as to mesh with these bevel gears.

According to a third aspect of the present invention, an upper shaft and a lower shaft of the sewing machine, and one of the upper shaft and the lower shaft is an output shaft which is coupled on a substantially same axis with the motor by a coupling, and And a driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft, wherein the driving force transmitting means is configured to drive the driven shaft from the output shaft. A driving force transmitting member that transmits a driving force to a shaft; and an output that connects the output shaft and the driving force transmitting member to the coupling in a state where the driving force is transmitted from the coupling to the driving force transmitting member. The power transmission device includes a shaft transmission portion and a driven shaft transmission portion provided on the driven shaft and transmitting a driving force from the driving force transmission member to the driven shaft.

According to the third aspect of the present invention, one of the upper shaft and the lower shaft is an output shaft that is connected on a substantially same axis as the motor by a coupling, and the other shaft is a shaft of the output shaft. In the driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft, the output shaft transmitting portion is provided in the coupling. The driving force transmission member through which the driving force from the output shaft is transmitted is disposed adjacent to the coupling. In other words, the driving force transmission means is disposed adjacent to the coupling that connects the motor and the output shaft, and unlike the related art, the distance between the coupling and the driving force transmission means is reduced. ,
A large space is formed adjacent to the driving force transmission means. For example, when the coupling is arranged at the rear end of the sewing machine and the upper shaft and the motor are connected via the coupling, the driving force transmission means is arranged at the rear side of the sewing machine. Thus, the space on the front side of the driving force transmission means in the sewing machine main body is widened. Therefore,
When arranging another driving mechanism such as a needle swing mechanism or a cloth feeding mechanism in this space, the layout can be easily performed.

Further, since the coupling also serves as the output shaft transmitting portion of the driving force transmitting means for transmitting the driving force from the output shaft to the driven shaft, the number of parts is reduced, and the manufacturing cost is reduced. Can be achieved.

Further, the output shaft transmitting portion of the driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft is provided at a portion of the output shaft adjacent to the coupling. The bearing that supports the output shaft,
The number of the output shaft transmission units can be reduced as compared with the case where the output shaft transmission unit is provided at a portion of the output shaft that is separated from the coupling.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a sewing machine according to the present invention will be described in detail with reference to FIGS.

<First Embodiment> FIG. 1 is a view showing an embodiment of a driving device for a sewing machine to which the present invention is applied. First, the configuration will be described.

As shown in the figure, the sewing machine frame 10 includes a bed 11 having a flat bed surface on an upper surface, a vertical body 12 standing on one end of the bed 11, and a vertical body 1
2 Arm 1 extending substantially parallel to bed 11 from above
3 and has a substantially U-shape in side view.

In the above-described sewing machine frame 10, the upper shaft 1 is disposed horizontally in the arm 13, and is rotatably supported by bearings 2a, 2b, 2c fixed to the sewing machine frame 10. A needle bar (not shown) is connected to a distal end portion 1a of the upper shaft 1 via a crank mechanism 3, and a needle is attached to a lower portion of the needle bar. The sewing machine motor 4 provided at the end of the vertical body 12 at the side 10 is connected via a coupling 5. The axes of the upper shaft 1 and the sewing machine motor 4 are arranged substantially on the same axis, and the upper shaft 1 is rotated by the driving of the sewing machine motor 4. Further, a lower shaft 6 is provided in the bed 11, a shuttle is connected to a tip 6 a of the lower shaft 6 (not shown), and a driving force from the upper shaft 1 is provided in the vertical body 12. Shaft 20 for transmitting the force to the lower shaft 6
Are arranged. In the sewing machine of this embodiment, the upper shaft 1 is an output shaft and the lower shaft 6 is a driven shaft. The upper shaft 1 and the lower shaft 6 are connected to a bevel gear (output shaft transmission unit) provided on the upper shaft 1. ) 16, bevel gear (driven shaft transmission portion) 17 provided on lower shaft 6, and vertical shaft (driving force transmission member)
20 and the upper shaft 1
The driving force can be transmitted to the lower shaft 6 from the motor.

The coupling 5 is provided in the vertical barrel 12 and is fixed to the shaft center of the sewing machine motor 4 inserted from outside to inside of one side surface (rear end face of the sewing machine frame) 14 of the vertical barrel 12. Motor shaft fixing portion 5a, an upper shaft fixing portion 5b fixed to the base end 1b of the upper shaft 1, and a cushion portion 5c interposed between the motor shaft fixing portion 5a and the upper shaft fixing portion 5b. And For example, even if there is misalignment or bending of the axis between the upper shaft 1 and the sewing machine motor 4, the coupling 5 buffers the coupling 5 by bending and absorbing the center cushion portion 5 c, and thereby the sewing machine motor 4. 4 is transmitted to the upper shaft 1, and the upper shaft 1 can be rotated without being eccentric.

The upper shaft 1 connected to the coupling 5 is provided with a bevel gear 16 which is adjacent to the coupling 5 and is externally fitted toward the coupling 5. The bevel gear 16 includes an upper shaft 1 driven by the sewing machine motor 4 and a vertical shaft 20 disposed in the vertical trunk 12.
The upper shaft 1 is connected to the vertical shaft 20 in a state of transmitting a driving force, and meshes with a bevel gear 22 constituting an upper end portion of the vertical shaft 20. The vertical shaft 20 is disposed vertically below the coupling 5 in the vertical body 12, and the bearings 18, 1 fixed in the vertical body 12.
8a. The vertical shaft 20 is provided with the shaft 2
1 and a bevel gear 22 provided at the upper end of the shaft portion 21
And the lower shaft 6 meshes with the bevel gear 17 provided at the lower end of the shaft 21, and connects the vertical shaft 20 and the lower shaft 6 to transmit the driving force from the vertical shaft 20 to the lower shaft 6. And a bevel gear 23. The lower shaft 6 is horizontally rotatably disposed in the bed 11 in parallel with the upper shaft 1 and has a bearing 9 fixed to the bed 11 side.
a, 9c and 9d.

According to the sewing machine driving apparatus of the embodiment configured as described above, the driving force is transmitted from the upper shaft 1 connected to the sewing machine motor 4 on the substantially same axis by the coupling 5 to the lower shaft 6. Since the vertical shaft 20 is provided with a bevel gear 16 for transmitting the driving force from the upper shaft 1 to the vertical shaft 20 at a portion adjacent to the coupling 5 of the upper shaft 1,
The vertical shaft 20 to which the driving force from the upper shaft 1 is transmitted via the bevel gear 16 is disposed below the coupling 5, and unlike the conventional case, the coupling 5 and the vertical shaft 2
A space 19 wider than the vertical shaft 20 on the front side of the sewing machine is formed due to the decrease in the interval with the zero.

Therefore, when other driving mechanisms such as a needle swing mechanism and a cloth feeding mechanism are arranged in the space 19, the layout can be easily performed. Also,
Bevel gear 16 for transmitting driving force from upper shaft 1 to vertical shaft 20
Is provided in a portion of the upper shaft 1 adjacent to the coupling 5, so that the number of bearings supporting the upper shaft 1 is reduced in a portion where the bevel gear 16 is separated from the coupling 5 of the upper shaft 1. It can be less than the case.

<Second Embodiment> A sewing machine shown in FIG. 2 is a view for explaining a second embodiment of a sewing machine driving device according to the present invention.

The driving apparatus for a sewing machine according to the second embodiment differs from the first embodiment only in the configuration of its driving mechanism, and the other configurations are substantially the same. Therefore,
The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different components will be described. When the same names as those in the first embodiment are used, they have the same functions unless otherwise specified.

As shown, the bed 11a, the vertical trunk 1
Sewing machine frame 10a composed of 2a and arm 13a
, An upper shaft 41 is disposed in the arm 13a so as to be rotatable in the horizontal direction, and the bearings 2b. 2c, 42. Needless to say, these bearings 2b, 2c, 42 have their positions fixed in the sewing machine frame 10.
The sewing machine motor 4 is connected to the rear end portion 41a of the upper shaft 41 via the coupling 43 in the same manner as in the first embodiment.
The sewing machine motor 4 is mounted such that the axis of the sewing machine motor 4 is the same as that of the upper shaft 41.

A lower shaft (driven shaft) is provided in the bed 11a.
44 is parallel to the upper shaft (output shaft) 41 and bearings 46a, 4
The lower shaft 44 is connected to the coupling 43 via a toothed belt (driving force transmission member) 47, and is driven by the rotation of the coupling 43. It is configured to interlock with the upper shaft 41 that performs. The upper shaft 41 and the lower shaft 44
Has a function similar to that of the first embodiment, and a description thereof will be omitted. Further, the sewing machine motor 4 is also attached to the end of the sewing machine frame 10a on the side of the vertical barrel 12a in the same manner as in the first embodiment. That is, with the shaft center inserted from outside to inside into the rear end surface 14a of the sewing machine frame 10a, the sewing machine frame 1
0a.

The coupling 43 connecting the upper shaft 41 and the sewing machine motor 4 has a cylindrical shape in the upper axial direction, and connects the sewing machine motor 4 and the upper shaft 41 with the axis of the sewing machine motor 4 and the upper shaft 41. The sewing machine motor shaft fixing portion 43a, the cushion portion 43b connected adjacent to the sewing machine motor shaft fixing portion 43a, and the cushion portion An upper shaft fixing portion 43c which is connected adjacent to the upper shaft 43b and fixes the rear end portion 41a of the upper shaft 41; and an outer peripheral surface of the upper shaft fixing portion 43c has a tooth portion meshing with the toothed belt 47. Are formed.

The upper shaft fixing portion 43c of the coupling 43
Is an outer peripheral surface having teeth formed thereon, which is connected to the toothed belt 47 and functions as a pulley for driving the toothed belt 47. With this configuration, the coupling 43 connects the upper shaft 41 and the sewing machine motor 4. In addition, it has a function of transmitting the rotation of the upper shaft 41 to the lower shaft 44. That is, the coupling 43 of the second embodiment is an upper shaft fixing portion (output shaft transmission portion) 43 connected to the toothed belt 47.
Except for the difference in the configuration of “a”, it has substantially the same function as the coupling 5 of the above-described first embodiment. A bearing 42 for suppressing whirling of the coupling 43 is externally fitted to the upper shaft 41 adjacent to the coupling 43, and the upper shaft 41 is supported by the bearing 42.

The toothed belt 47 is connected to the upper shaft fixing portion 43c of the coupling 43 above the vertical body portion 12a, and is provided on the lower shaft 44 in the bed 11a below the vertical body portion 12a. (The driven shaft transmission portion) and are connected in a state where the driving force of the toothed belt 47 can be transmitted to the lower shaft 44. That is, in the sewing machine according to this embodiment, the driving force transmitting means for transmitting the driving force from the upper shaft 41 to the lower shaft 44 includes the upper shaft fixing portion 43 c of the coupling, the toothed belt 47.
And a pulley 48.

The toothed belt 47 is disposed in a direction perpendicular to the upper shaft 41 and the lower shaft 44, and in the vertical trunk portion 12a, in a state shifted toward the rear end surface 14a of the sewing machine frame 10a. It is in a state. Therefore, a space 19a is formed in the vertical trunk portion 12a on the front side of the sewing machine with respect to the toothed belt 47.

As described above, the coupling 43 connecting the sewing machine motor 4 and the upper shaft 41 transmits the driving force of the upper shaft 41 to the lower shaft 44 together with the toothed belt 47. It is arranged so as to extend downward from the coupling 43, so that the same effect as in the first embodiment can be obtained. In addition, compared with the case where the upper shaft and the lower shaft are connected using the vertical shaft, The number of parts is reduced and the production cost is not required.

In this embodiment, a toothed pulley is provided in a part of the coupling 43, and the lower shaft is driven via a toothed belt connected to the toothed pulley. Not limited to this, a gear is attached to a part of the coupling, a vertical shaft provided with a bevel gear meshing with this gear at the upper end is disposed below the coupling, and the lower shaft is driven via this vertical shaft. You may. At this time, the vertical shaft is configured to drive the lower shaft via a bevel gear at the lower end portion, like the vertical shaft of the first embodiment.

Further, each sewing machine in each of the above embodiments has been described as a sewing machine having a rotary hook in which the lower shaft also rotates in conjunction with the rotation of the upper shaft, but the present invention is not limited to this, and the present invention is not limited to this. A sewing machine equipped with a half-turn pot shown in the example,
Needless to say, the present invention can be applied to any sewing machine having an upper shaft and a lower shaft. Further, in the sewing machine according to each of the above-described embodiments, the sewing machine motor is connected to the upper shaft via the coupling, and the upper shaft is described as the output shaft. However, the present invention is not limited to this, and the sewing machine motor may be coupled to the lower shaft. , And the lower shaft may be configured as an output shaft.

[0042]

As described above, according to the driving apparatus for a sewing machine according to the first aspect of the present invention, one of the upper shaft and the lower shaft is connected on a substantially same axis with the motor by the coupling. An output shaft, the other shaft being a driven shaft interlocked with the driving of the output shaft, and a driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft, the driving shaft being adjacent to the coupling of the output shaft. Since the output shaft transmission portion is provided in the portion, the driving force transmission member to which the driving force from the output shaft is transmitted via the output shaft transmission portion is disposed near the coupling. . In other words, the driving force transmission means is disposed near the coupling that connects the motor and the output shaft, and unlike the related art,
As the distance between the coupling and the driving force transmitting means is reduced, a large space is formed adjacent to the driving force transmitting means.

Therefore, when other driving mechanisms such as a needle swing mechanism and a cloth feeding mechanism are arranged in this space,
The layout can be easily performed. Further, the output shaft transmission portion of the driving force transmission means for transmitting a driving force from the output shaft to the driven shaft is provided in a portion of the output shaft adjacent to the coupling, so that the output shaft is The number of bearings to be supported can be reduced as compared with the case where the output shaft transmission is provided at a portion of the output shaft remote from the coupling.

According to the driving device for a sewing machine according to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and the driving force transmitting member is provided between the coupling and the driven shaft. Between the coupling and the driven shaft, the space formed adjacent to the driving force transmission means becomes wider by the space between the coupling and the driven shaft. Effective use of the space thus formed can be performed effectively.

According to the driving device for a sewing machine according to the third aspect of the present invention, one of the upper shaft and the lower shaft is an output shaft which is connected to a motor substantially on the same axis by a coupling, and the other shaft is the other. Since the shaft is a driven shaft that is interlocked with the driving of the output shaft, and the output shaft transmission portion is provided in the coupling, in the driving force transmission unit that transmits a driving force from the output shaft to the driven shaft, The driving force transmission member to which the driving force from the output shaft is transmitted via the output shaft transmission portion is disposed adjacent to the coupling. In other words, the driving force transmission means is disposed adjacent to the coupling that connects the motor and the output shaft, and unlike the related art, the distance between the coupling and the driving force transmission means is different. Because of the narrowing, a large space is formed adjacent to the driving force transmission means, and the same effect as the first aspect of the invention can be obtained. Further, since the coupling also serves as the output shaft transmission portion of the driving force transmission means, the number of parts is reduced, and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a sewing machine showing a schematic configuration of a driving device of the sewing machine as an example to which the present invention is applied.

FIG. 2 is a longitudinal sectional view of a sewing machine showing a sewing machine driving device according to another embodiment to which the present invention is applied.

FIG. 3 is a longitudinal sectional view of a sewing machine showing an example of a driving device of the conventional sewing machine.

FIG. 4 is a longitudinal sectional view of a sewing machine showing another example of a driving device of the conventional sewing machine.

[Explanation of symbols]

 Reference Signs List 1 upper shaft (output shaft) 1a distal end of upper shaft 1b base end of upper shaft 2a, 2b, 2c bearing 4 sewing machine motor 5 coupling 5a motor shaft fixing portion 5b upper shaft fixing portion 5c cushion portion 6 lower shaft (follower) Shaft) 16 bevel gear (output shaft transmission unit) 17 bevel gear (driven shaft transmission unit) 18 bearing 20 vertical shaft (driving force transmission member) 41 upper shaft (output shaft) 42 bearing 43 coupling 43c upper shaft fixed unit (output shaft transmission unit) ) 44 Lower shaft (driven shaft) 46a Bearing 47 Toothed belt (driving force transmission member) 48 Toothed pulley (driven shaft transmission portion)

Claims (3)

[Claims] 1. An upper shaft and a lower shaft of a sewing machine, and one of the upper shaft and the lower shaft is an output shaft which is coupled on a substantially same axis as a motor by a coupling, and the other shaft is the output shaft. And a driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft, wherein the driving force transmitting means transmits a driving force from the output shaft to the driven shaft. A driving force transmitting member, which is provided at a portion of the output shaft adjacent to the coupling, wherein the output shaft and the driving force transmitting member transmit driving force from the output shaft to the driving force transmitting member. And a driven shaft transmission unit provided on the driven shaft and transmitting a driving force from the driving force transmission member to the driven shaft. 2. The driving device for a sewing machine according to claim 1, wherein the driving force transmitting member is disposed between the coupling and the driven shaft, and is driven from the output shaft via the output shaft transmitting portion. A driving force is transmitted to the driven shaft via the driven shaft transmission unit, the driving force being transmitted to the driven shaft. 3. An upper shaft and a lower shaft of the sewing machine, and one of the upper shaft and the lower shaft is an output shaft that is coupled on a substantially same axis as the motor by a coupling, and the other shaft is the output shaft. And a driving force transmitting means for transmitting a driving force from the output shaft to the driven shaft, wherein the driving force transmitting means transmits a driving force from the output shaft to the driven shaft. A driving force transmitting member, an output shaft transmitting portion provided on the coupling, for connecting the output shaft and the driving force transmitting member in a state of transmitting a driving force from the coupling to the driving force transmitting member; And a driven shaft transmission unit provided on the driven shaft for transmitting a driving force from the driving force transmission member to the driven shaft.