JP2003299893A - Multi-head sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine by which sewing precision is improved by reducing frame distortion without extending the whole length of the sewing machine with a simple structure and a low cost. <P>SOLUTION: In the multi-head sewing machine provided with sewing machine heads 6, sewing frames 11, Y-direction driving apparatuses 21, and an X-direction driving apparatuses 41, a right-most Y-direction driving apparatus 21 is provided on a right side compared with a right-most sewing machine head 6, a front-side X edge 11a and a rear-side X-edge 11b are extended to a right side compared with a right-side Y edge 11d, a left-mode Y-direction driving apparatus 21 is provided on a left side compared with a left-most sewing machine head 6, and the front-side X edge 11a and the rear-side X-edge 11b are extended to a left side compared with a left-side Y edge 11c. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine, which is placed on a table surface of a sewing machine and has a sewing frame for stretching and holding a work cloth arranged below the table surface, in a X direction and / or a Y direction of the sewing machine. The present invention relates to a driving type sewing machine. In the sewing machine, the left-right direction is conventionally referred to as the X direction (or the V direction), and the front-rear direction is referred to as the Y direction (or the H direction).

[0002]

2. Description of the Related Art As a sewing machine of this type, a table 50 is used.
Sewn frame 51 and a sewn frame 5 mounted on the surface of the
1, a head 59 provided above the table 1, a shaft member 52 that vertically penetrates the table 50 and engages with the sewing frame 51, and a Y provided below the table 50 that drives the shaft member 52 in the Y direction. The direction drive device 53, a slide guide 58 that engages with a shaft member 57 provided on the upper side of the right Y side of the sewing frame 51 and extends in the Y direction, a slide guide 58 and a shaft member 57.
And a cover plate 54 provided with a slit 55 for allowing the shaft members 52 and 57 to pass vertically above and below the table 50. The sewing machine is known.

Further, as disclosed in Japanese Patent Application No. 2000-355868, a rectangular frame-shaped sewing frame 62 placed on the surface of the table 61, and a head 67 provided above the sewing frame 62. , A rectangular frame-shaped outer frame 63 that supports the sewing frame 62 slidably in the X direction, and the sewing frame 6 with respect to the outer frame 63.
An X-direction drive device 64 for driving 2 in the X-direction, and an outer frame 63
A rail 65 for supporting the reciprocating motion in the Y direction, and an outer frame 6
There is known a sewing machine including a Y-direction drive device 66 that drives the sewing frame 62 in the Y direction together with the outer frame 63 by engaging with the Y side of the sewing machine.

[0004]

The above sewing machine has the following problems. (1) The rightmost Y-direction driving device 53 and the leftmost Y-direction driving device 53 are provided more than the rightmost head 59 and the leftmost head 59 in order to prevent the unsewn portion from being generated in the sewing frame 51. Since it is provided inside, in the type that supports several points on the X side of the sewing frame 51 and drives in the Y direction, when the sewing frame 51 is driven in the Y direction when largely driven in the X direction, In some cases, the sewing frame 51 was bent in the Y direction as shown in FIG. 10 to adversely affect the sewing finish. (2) In the case of the type in which substantially the entire X side of the sewing frame 62 is supported and driven in the Y direction, the sewing frame 62 does not bend in the Y direction, but the weights of the sewing frame 62 and the outer frame 63 increase. Therefore, it is necessary to increase the output of the Y-direction drive device 66, and there is a problem that an increase in the weight of the entire sewing machine cannot be avoided. Also, the outer frame 63 and the sewing frame 6
In addition, there is a problem that a supporting member for supporting substantially the entire X side of the sewing frame 62 is separately required, the number of parts increases, and the structure of the sewing machine becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine which has a simple structure and which is inexpensive and which improves the sewing accuracy by reducing the frame distortion without extending the entire length of the sewing machine.

[0006]

The sewing machine according to the present invention comprises:
A plurality of sewing heads arranged at intervals in the X direction, a rectangular frame-shaped sewing frame arranged below the sewing head, and sewing by engaging with the front X side and the rear X side of the sewing frame. A multi-head sewing machine including a Y-direction driving device that drives the frame in the Y direction and an X-direction driving device that engages with the right Y side or the left Y side of the sewing frame to drive the sewing frame in the X direction Right Y
The direction drive device is provided on the right side of the rightmost sewing head, and when the sewing frame is driven to the left limit position by the X direction drive device, the rightmost Y direction drive device and the front X side and the rear X side. The front X side and the rear X side are extended to the right of the right Y side so that the engagement with the side does not come off, and the leftmost Y-direction drive device is provided on the left side of the leftmost sewing machine head. At the same time, when the sewing frame is driven to the right limit position by the X-direction drive device, the leftmost Y-direction drive device and the front X side and the rear X side are not disengaged from each other. It is characterized in that the rear X side is extended to the left of the left Y side.

A plurality of sewing heads are attached to an upper frame extending left and right, and the upper frame is provided closer to the left side than the left limit position of the sewing frame and closer to the right side than the right limit position of the sewing frame. The right and left columns are supported by the left and right columns, and the center of the columns is approximately aligned with the extension of the needle drop point in the X direction, and the front-rear width is the side width of the front X side and the rear side. The width of the X-side is less than or equal to the total width of the X-side, and the extension of the front X-side is provided so that the trailing edge thereof is displaced to the front by more than the width of the front X-side. Is preferably provided so as to be displaced to the rear side by more than the width of the rear X side.

Even if the sewing frame is integrally molded,
Alternatively, the individually formed front X side, rear X side, right Y side, and left Y side may be joined together.

The widths of the front X side and the rear X side may be different or the same. Considering the weight balance of the sewing frame and the production cost, it is preferable that the front X side and the rear X side are formed in the same cross-sectional shape. In that case, the side width between the front X side and the rear X side is Will be the same.

The extended portion of the front X side may be integrally formed with the front X side, or may be formed separately from the front X side so that it can be joined to the front X side after molding. . Further, the extension portion of the front X side may be provided for each Y-direction driving device, may be provided continuously in units of some adjacent Y-direction driving devices, or may be provided in one continuous state. Often, it is appropriately selected in consideration of the distance between the Y-direction driving devices and the X-direction driving length of the sewing frame.

Even if the extension of the rear X side is formed integrally with the rear X side, it is formed separately from the rear X side so that it can be joined to the rear X side after molding. It may be. Further, the extended portion of the rear X side may be provided for each Y-direction driving device, or may be provided continuously in units of several adjacent Y-direction driving devices, or may be provided in one continuous state. Alternatively, it may be appropriately selected in consideration of the distance between the Y-direction driving devices and the X-direction driving length of the sewing frame.

[0012]

1 to 5 show a sewing machine according to a first embodiment of the present invention. This sewing machine has a plurality of sewing heads 6 arranged in a row at intervals in the X direction, a rectangular frame-shaped sewing frame 11 arranged below the sewing head 6, a front X side 11a of the sewing frame 11 and a rear side. A Y-direction drive device 21 that engages with the side X side 11b and drives the sewing frame 11 in the Y direction;
An X-direction drive device 41 that engages with the right side Y side 11d or the left side Y side 11c of the sewing frame 11 to drive the sewing frame 11 in the X direction.
It has and.

A plurality of (four in the illustrated example) sewing heads 6
Is attached to the upper frame 3 extending left and right at a predetermined interval, and the upper frame 3 is provided on the left side of the left limit position of the sewing frame 11 and on the right side of the right limit position of the sewing frame 11. It is supported by the right column 2 provided.
The left support 1 and the right support 2 are formed in a rectangular tube shape extending vertically.

Between the lower parts of the left column 1 and the right column 2,
A lower frame 4 extending in the X direction is supported. A table 8 is supported on the lower frame 4 substantially horizontally, and a plurality of beds 7 are placed directly below the sewing machine heads 6.
Are lined up at approximately the same height. As is well known, a needle that is vertically reciprocally driven by the sewing machine head 6 and a shuttle that is rotationally driven by the bed 7 cooperate to sew a work cloth described later.

Further, the rightmost Y-direction drive device 21 is provided on the right side of the rightmost sewing head 6, and when the sewing frame 11 is driven to the left limit position by the X-direction drive device 41, Y direction drive device 21 and front X side 11a
And the front X side so that the engagement with the rear X side 11b is not disengaged.
The side 11a and the rear X side 11b are extended to the right of the right Y side 11d, the leftmost Y direction drive device 21 is provided to the left of the leftmost sewing head 6, and the X direction drive device 41 is provided. When the sewing frame 11 is driven to the right limit position by, the front X side 1 is prevented from being disengaged from the leftmost Y-direction drive device 21 and the front X side 11a and the rear X side 11b.
1a and the rear X side 11b are extended leftward rather than the left Y side 11c.

Immediately above the table 8, there are a front X side 11a and a rear X side 11b extending in the X direction, and a left Y side 11c and a right Y side 11d extending in the Y direction. A sewing frame 11 (an embroidery frame in an embroidery sewing machine) in the shape of a substantially horizontally long rectangular frame in plan view is arranged for stretching and holding. The front X side 11a and the rear X side 11b are left Y
It extends longer to the left than the side 11c, and on the right side Y side 11
It is extended to the right of d.

Front X side 11a, rear X side 11b, left side Y
A work cloth is held inside the side 11c and the right Y side 11d by a gripping means such as a clip. Further, as shown in FIG. 2, each cross section of the front X side 11a, the rear X side 11b, the left Y side 11c, and the right Y side 11d has a shape in which four vertical walls hang down from a plane wall. .

On the upper surface of the right Y side 15, a plurality of (three in the illustrated example) rollers 12 are arranged at intervals in the Y direction and are rotatably mounted on a horizontal plane.

A cover 13 and a cover 14 are provided on the upper surface of the table 8 at three positions which are divided into approximately four equal parts in the X direction, at a position closer to the front end right side and at a position closer to the rear end right side. The cover 13 is formed so as to extend in the Y direction and cover the front edge of the table 8 to the rear edge thereof, and the Y center is formed substantially at the center thereof.
Two notches 15 extending in the direction are provided in columns.
The covers 14 are respectively formed so as to extend in the X direction at positions on the right side of the front end portion and the rear end portion of the table 8, and a notch 16 extending in the X direction is provided at each center.

Below the left notch 15, the center notch 15 and the right notch 15, there are leftmost, middle and rightmost Y-direction driving devices 21 for driving the sewing frame 11 in the Y direction.
5, respectively. Also, each notch 16
Two X-direction drive devices 41 for driving the sewing frame 11 in the X-direction are provided along the respective notches 16 on the lower side. Each Y-direction driving device 21 and each X-direction driving device 41
Since the respective configurations are the same, one Y direction driving device 21 and one X direction driving device 41 will be described below.

The Y-direction drive device 21 includes a belt drive mechanism arranged at a position closer to the rear of the table 8 and a slide guide mechanism arranged at a position closer to the front of the table 8. The belt drive mechanism includes guide rails 24 and 25 provided on the rail base 5 of the lower frame 4 and sliders 26 and 2 that slide on the guide rails 24 and 25.
7 and the notches 1 provided upright on the sliders 26 and 27.
Two shaft members 28 protruding from the upper part of the table 8
A roller 29 that is rotatably mounted on the upper end of each shaft member 28 in a horizontal plane and engages with both inner side surfaces of the two vertical walls of the sewing frame 11, and a rail base at both ends of the guide rail 24. 5, a pair of pulleys 30 provided on the
One position is connected to the slider 26, and both pulleys 3
It is composed of an endless belt 31 wound around 0 and a connecting bar 32 connecting the slider 26 and the slider 27. In addition, all the Y
A Y-direction drive motor 33 that is coupled to a pulley 30 on the rear side of the direction drive device 21 and drives each belt 31 in synchronization.
Is supported.

The X-direction drive device 41 includes a guide rail 42 mounted on the rail base 5 of the lower frame 4, a slider 43 sliding on the guide rail 42, and a slider 4
3, a shaft member 44 standing on the upper side of 3 and protruding from the notch 16 to the upper side of the table 8, a slide guide 45 installed between the upper ends of the shaft members 44, and provided on the rail base 5 at both ends of the guide rail 42. A pair of pulleys 48,
One position is connected to the slider 43 and both pulleys 4
8 and an endless belt 46 wound around 8. The lower frame 4 also supports an X-direction drive motor 47 that is coupled to the right pulleys 48 of all the X-direction drive devices 41 and drives each belt 46 in synchronization. As the guide rails 24, 25, 42 and the sliders 26, 27, 43, it is convenient to use, for example, a commercially available V groove rail and LM guide.

The slide guide 45 is formed in a flat hollow shape extending in the Y direction and has a length slightly shorter than the length of the table 8 in the Y direction. Below the slide guide 45,
Groove 46 in which the three rollers 12 are engaged so that they can roll in the Y direction.
Are formed to extend in the Y direction over substantially the entire length of the slide guide 45. In addition, the slide guide 45
Are fixed to the upper ends of the two shaft members 44 at positions near their front ends and positions near their rear ends, respectively.

According to the sewing machine configured as described above,
By driving the Y-direction drive motor 33 based on the sewing data, the two shaft members 28 are driven in the Y direction along the notch 10, and accordingly, the two shaft members 28 are attached to the two shaft members 28. Two rollers 29 drive the sewing frame 11 in the Y direction. At this time, since the roller 12 is rotatably engaged with the groove 46 extending in parallel with the Y direction of the slide guide 45, the driving of the sewing frame 11 in the Y direction is allowed.

Further, by driving the X-direction drive motor 47 based on the sewing data, the shaft member 44 is driven in the X direction along the notch 10, and accordingly, the slide member fixed to the shaft member 44 is slid. The guide 45 drives the sewing frame 11 in the X direction via the roller 12 engaging with the groove 46. At this time, the six rollers 29 of the Y-direction drive device 21 are connected to the front X side 11a and the rear X side parallel to the X direction.
Since they are respectively engaged with the sides 11b, the sewing frame 11 can be driven in the X direction.

Further, the front X side 11a and the rear X side 11b
Is extended to the left of the left Y side 11c and to the right of the right Y side 11d, and the vertical walls that engage the roller 29 with the inner surface are the front X side 11a and the rear side. Since the roller 29 extends to the left and right ends of the X side 11b, the roller 29 can continue to be engaged to the left and right ends of the front X side 11a and the rear X side 11b.

Further, in this embodiment, although the leftmost Y-direction driving device 21 is provided to the left of the leftmost sewing machine head 6, the front X side 11a and the rear X side 1 are arranged.
Since 1b is extended to the left of the left Y side 11c, as shown in FIG. 4, when the sewing frame 11 is driven to the position near the right limit position, the leftmost roller 29 causes the front X side 11 to move.
Since the engagement continues to the left side of the left side Y side 11c of the a and the rear side X side 11b, the sewing frame 11 is allowed to be driven to the right limit position, and the needle drop point of the leftmost needle. 9 left Y
The side 11c can be brought close to the aides.

The sewing frame 11 driven to the right limit position
The length of the portion extending to the right of the rightmost roller 29 is such that the rightmost Y-direction drive device 21 is the rightmost sewing head 6.
Since it is installed on the right side, it becomes shorter than the conventional model. Further, the right Y side 11d is the front X side 11a and the rear X side.
Since it is located slightly inside rather than the right end of the side 11b, the inertia applied to the portion of the sewing frame 11 extending to the right of the rightmost roller 29 when driving the sewing frame 11 in the right limit position in the Y direction. The force is smaller than in the conventional case because the effect of the length of the portion of the sewing frame 11 extending to the right of the rightmost roller 29 is shortened, which is also combined. Due to this decrease in inertial force, when the sewing frame 11 is driven in the Y direction with the sewing frame 11 being driven to the right from the neutral position, the sewing frame 1
Since there is little bending generated in No. 1, the sewing accuracy does not decrease even near the right end of the sewing frame 11.

Although the rightmost Y-direction driving device 21 is provided on the right side of the rightmost sewing machine head 6, the front X side 11a and the rear X side 11b are the right Y side 11d. Since it is extended to the right more than the right side, as shown in FIG. 5, when the sewing frame 11 is driven to the position near the left limit position, the rightmost roller 29 causes the front X side 11a and the rear X side 1 to move.
Since the engagement continues with the portion extended to the right of the right Y side 11d of 1b, the drive to the left limit position of the sewing frame 11 is permitted, and the needle drop point 9 of the rightmost needle is moved to the right Y side. You can get close to your aides.

The sewing frame 11 driven to the left limit position
The length of the portion extending to the left of the leftmost roller 29 is such that the leftmost Y-direction drive device 21 is the leftmost sewing head 6
Since it is installed on the left side of the machine, it is shorter than the conventional model. Further, the left Y side 11c is the front X side 11a and the rear X side.
Since the side 11b is located slightly inside, not on the left end, when the sewing frame 11 in the left limit position is driven in the Y direction, the inertia applied to the portion of the sewing frame 11 that extends to the left of the leftmost roller 29 of the sewing frame 11 is driven. The force is smaller than in the conventional case because the effect of the fact that the length of the portion of the sewing frame 11 that extends to the left of the leftmost roller 29 is shorter is also combined. Due to this decrease in inertial force, when the sewing frame 11 is driven in the Y direction at any position from the right limit position to the left limit position, the sewing frame 11 is less likely to bend, so that the sewing accuracy is improved even near the left end of the sewing frame 11. Does not fall.

Next, the second embodiment of the sewing machine embodying the present invention will be described with reference to FIG. 6 only regarding the differences from the first embodiment. The sewing machine according to the present embodiment has positions and front and rear widths of a left support column and a right support column, a front X side and a rear X side.
Only the side structure is different from the first embodiment.

That is, in the sewing machine of this embodiment, the upper frame 3 is located closer to the left side than the left limit position of the sewing frame 11 and is located closer to the right side than the right limit position of the sewing frame 11. Is supported by the right support column 2 provided by the above.
In addition, the left column 1 and the right column 2 have their center aligned substantially on the extension of the needle drop point in the X direction, and their front and rear widths are the widths of the front X side 11a and the rear X side 11b. It is provided below the total.

A plurality of (four in the illustrated example) sewing machine heads 6 are arranged on the left and right so that the center Cc of the left support 1 and the center Cd of the right support 2 substantially coincide with the extension of the needle drop point 9 in the X direction. It is attached to the extending upper frame 3. The left support 1 and the right support 2 have a side width La of the front X side 11a.
And the front-rear width 2L which is slightly smaller than the total of the side width Lb of the rear X side 11b.

Further, a front extension portion 18 as an extension portion of the front X side 11a is formed on each of the left side and the right side of the front side of the front X side 11a. Each of the front extension portions 18 is formed so that a cross section in which four vertical walls hang down from a plane wall extends in the X direction, and the rear edge of the front extension portion 18 is aligned with the front edge of the front X side 11a. Therefore, the rear edge of the front extension 18 is in a state of being displaced to the front by the side width La of the front X side 11a. Further, in the front extension portion 18, front rollers 29 are engaged with both inner side surfaces of two vertical walls so as to be rollable in the X direction, and the sewing frame 11 is driven from the right limit position to the left limit position. It has such a length that the engagement with the roller 29 is not disengaged even if it is performed.

A rear extension portion 19 as an extension portion of the rear X side 11b is formed on each of the rear left side and right side of the rear X side 11b. Similar to the front extension 18, each rear extension 19 is formed such that a cross section in which four vertical walls hang down from a flat wall extends in the X direction, and the front edge of the rear extension 19 has a rear X side 11b. Since it is made to coincide with the rear edge, the front edge of the rear extension portion 18 is shifted to the rear side by the side width Lb of the rear X side 11b. In addition, the rear extension 19 is 2
Rear rollers 29 are engaged with both inner side surfaces of the vertical wall of the strip so as to be rollable in the X direction, and like the front extension 18, the sewing frame 11 is driven from the right limit position to the left limit position. Even roller 2
It has such a length that the engagement with 9 will not be disengaged.

Therefore, the multi-head type sewing machine of this embodiment operates as follows. For example, as shown in FIG. 7, the sewing frame 1
When 1 is driven to the right limit and the front limit, the right edge of the slide guide 45 is brought close to the left side surface of the right support 2, and the front edge of the rear extension 19 is located at the rear surface of the right support 2. Will be close. At this time, the front edge of the rear extension 19 is the rear X side 11b.
Is shifted to the rear side by the side width Lb of, the rear X side 11b
The front edge of is driven to a position displaced from the needle drop point rearward by approximately L-Lb, and the needle drop point is brought close to the front edge of the rear X side 11b. Further, at this time, since the needle drop point 9 of the leftmost needle is close to the intersection of the front edge of the rear X side 11b and the right edge of the left Y side 11c, the needle drop point 9 is located on the left side and the rear side of the sewing frame 11. Almost no part that cannot be sewn occurs.

Further, as shown in FIG. 8, when the sewing frame 11 is driven to the left limit position and the rear limit position, the left Y side 1
The left edge of 1c is brought close to the right side surface of the left-side strut 1, and the rear edge of the front extension 18 is brought close to the front side surface of the left-side strut 1. At this time, since the trailing edge of the front extension 18 is displaced to the front by the side width La of the front X side 11a, the front edge of the front X side 11a is displaced from the needle drop point 9 forward by about L-La. The needle drop point 9 is brought close to the trailing edge of the front X side 11a. At this time, the needle drop point 9 of the rightmost needle is the front side X side 11
Since it is close to the intersection of the rear edge of a and the left edge of the right Y side 11d, almost no unsewable portion is formed on the right side and the front side of the sewing frame 11.

Next, the third embodiment shown in FIG. 9 differs from the second embodiment only in that the front extension 18 and the rear extension 19 are formed in a continuous state. The same effect as the second embodiment can be obtained, and the productivity of the sewing frame 11 can be improved although the weight of the sewing frame 11 increases.

The present invention is not limited to the configuration of the above-described embodiment, and may be embodied with appropriate modifications, for example, as follows, without departing from the spirit of the invention. (1) At least one of the X-direction driving device and the Y-direction driving device is provided above the table.

[0040]

As described above in detail, according to the sewing machine of the first aspect, the sewing accuracy is improved by reducing the frame distortion without extending the entire length of the sewing machine despite the simple structure and the low cost. Can be made. Further, claim 2
According to the described sewing machine, in addition to the above effects, the non-sewable region in the sewing frame can be eliminated.

[Brief description of drawings]

FIG. 1 is a plan view of a sewing machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view showing a different state of the sewing machine.

FIG. 5 is a plan view showing the sewing machine in a different state.

FIG. 6 is a plan view of a sewing machine according to a second embodiment of the present invention.

FIG. 7 is a plan view showing a different state of the sewing machine.

FIG. 8 is a plan view showing the sewing machine in a different state.

FIG. 9 is a plan view of a sewing machine according to a third embodiment of the present invention.

FIG. 10 is a plan view showing a conventional sewing machine.

FIG. 11 is a plan view showing another conventional sewing machine.

[Explanation of symbols]

6 sewing machine head 11 sewing frame 11a Front side X side 11b Rear X side 11c Left Y side 11d right side Y 21 Y direction drive 41 X-direction drive

Claims (2)

[Claims] 1. A plurality of sewing heads arranged in a row at intervals in the X direction, a rectangular frame-shaped sewing frame arranged below the sewing head, and a front side X side and a rear side X of the sewing frame. A Y-direction drive device that engages a side to drive the sewing frame in the Y direction, and an X-direction drive device that engages the right Y side or the left Y side of the sewing frame to drive the sewing frame in the X direction. In the multi-head sewing machine including the above, when the rightmost Y direction drive device is provided to the right of the rightmost sewing machine head, and the sewing frame is driven to the left limit position by the X direction drive device. , So that the rightmost Y-direction drive device and the front side X side and the rear side X are not disengaged, the front side X side and the rear side X are extended to the right of the right side Y, The leftmost Y-direction drive device is provided to the left of the leftmost sewing machine head. When the sewing frame is driven to the right limit position by the X-direction drive device, the front side so that the leftmost Y-direction drive device is not disengaged from the front X side and the rear X side. A multi-head sewing machine characterized in that the X side and the rear X side are extended to the left of the left Y side. 2. A sewing machine head mounted on an upper frame extending left and right, wherein the upper frame is provided closer to the left side than the left limit position of the sewing frame and the right limit of the sewing frame. The right and left props are supported by a right post provided closer to the right of the position, and the left post and the right post have their center aligned substantially with the extension of the needle entry point in the X direction, and the front-rear width of the front X The width of the side and the width of the rear X side are equal to or less than the sum of the widths of the rear X side, and the extended portion of the front X side is provided such that the rear edge thereof is displaced to the front side by more than the side width of the front X side. 2. The multi-head sewing machine according to claim 1, wherein the extended portion of the X side is provided so that its front edge is displaced rearward by more than the width of the rear X side.