JPH0938367A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily vary the phase of motion of a thread-take-up lever with respect to the motion of a hook by providing a phase changing mechanism which is disposed in association with a drive axis to rotate a drive cam for driving the lever back and forth in a circumferential direction with respect to the drive axis so that a desired mount angle can be set. SOLUTION: If an upper axis 21, which is rotated in synchronization with a hook drive axis of a hook, is rotated, a drive cam 27 rotates together with a sleeve under conditioned that an engaging groove 33a of the sleeve is engaged with an engaging pin 35 so that a drive cam 28 in engagement with a cam groove 26 of the cam 27 is oscillated and displaced. The oscillation of the arm 28 causes a thread-take-up lever 20 to reciprocates between upper and lower dead points. A mount angle of the cam 27 with respect to the axis 21 is varied by a phase changing mechanism 38 that the phase of motion of the lever 20 for the motion of the hook is varied. That is, the rotation of a control motor causes the sleeve to slide through a control axis 39 and a supporting block 40 to move the cam 27 in the circumferential direction along the engaging groove 33a.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a sewing thread and a cloth.
The present invention relates to a lockstitch type sewing machine in which the phase of the motion of the balance can be easily changed according to the property of the (sewn object) or the desired sewing state.

[0002]

2. Description of the Related Art The function of a balance in a lockstitch type sewing machine is that the needle thread (sewing needle) is slightly moved upward from the bottom dead center position, and the needle thread caught by the hook tip of the hook is rotated along with the rotation of the hook. The upper thread is loosened sufficiently to allow it to be pulled in from the upstream side, or the upper thread is pulled up after the upper thread has passed through the shuttle to tighten the thread. Therefore, the balance must be driven in an optimal motion with a predetermined phase relationship with respect to the motion of the needle bar or shuttle, and is normally synchronized via a cam mechanism or the like with a drive source common to the needle bar and shuttle. It is designed to drive.

[0003]

By the way, in the above-described motion of the balance, the timing at the time of pulling up (hereinafter referred to as pulling up timing) has a great influence on the tightening of the sewing machine, and the difference in the properties of the needle thread, the properties of the sewn product, etc. Delicately different depending on. Therefore, it is necessary to adjust the timing of pulling up the balance to be optimum according to these conditions, but this adjustment is extremely frequent and requires a lot of trouble. That is, in order to adjust the pull-up timing, it is necessary to change the fixed position of the cam or the like for driving the balance with respect to the drive shaft. Particularly, in a multi-head sewing machine having a plurality of sewing machine heads, the sewing machine heads are Since there are as many balances as there are, the adjustment work becomes more complicated.

Further, in recent years, even for embroidery sewn by, for example, an embroidery sewing machine, the demand for the finishing thereof has become highly sophisticated and diversified, and particularly the demand for thread tightening has become strict. In other words, it is the actual situation that a texture with a tight thread tightness or a texture with a weak thread tightness is desired depending on the content of the embroidery, and it is extremely difficult to meet all these diverse needs. Have difficulty.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to suitably solve the above-mentioned problems, and is suitable for the texture of the thread tightness to be obtained depending on the properties of the thread, the properties of the material to be sewn or the like. Accordingly, it is an object of the present invention to provide a sewing machine capable of easily setting an optimum balance motion.

[0006]

SUMMARY OF THE INVENTION In order to overcome the above problems and preferably achieve an intended object, the present invention drives a balance by a drive shaft that is driven in synchronization with a shuttle drive shaft that rotationally drives a shuttle. In the sewing machine configured to do so, a drive cam that is disposed so as to be linked to the drive shaft and that reciprocally drives the balance,
By rotating this drive cam in the circumferential direction with respect to the drive shaft,
A phase changing mechanism capable of setting a desired mounting angle, and by controlling and driving the phase changing mechanism by a required driving means to adjust the displacement of the drive cam with respect to the drive shaft to a desired mounting angle. The phase of the motion of the balance can be changed with respect to the motion of the shuttle.

[0007]

By driving the phase change mechanism by the control motor, the drive cam rotatably arranged on the drive shaft is changed to a desired angular position, and the phase of the motion of the balance driven by this drive cam is changed. , The motion of the hook can be changed. Further, in the multi-head type sewing machine, the phase changing mechanism is arranged in each sewing machine head, and the phase changing mechanism can be simultaneously controlled by a single control motor, so that the phase of the motion of the balance can be changed quickly and easily.

[0008]

【Example】

(Regarding the first embodiment) Next, regarding the sewing machine according to the present invention,
A preferred embodiment applied to a multi-needle multi-head embroidery sewing machine (multi-head embroidery sewing machine) will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a multi-head embroidery sewing machine. A plurality of sewing machines (7 in this embodiment) are provided on the front surface of an upper frame 1 of the sewing machine.
6-needle type sewing machine heads 2 are arranged at equal intervals, and an embroidery frame 5 for holding an embroidered object such as cloth is provided on the sewing machine table 3 below the sewing machine head 2. It has been placed. The embroidery frame 5 is linked to a frame drive mechanism (not shown) installed under the sewing machine table 3, and is moved and driven in the left-right and front-back directions based on the embroidery data.

An intermediate frame 8 located below each sewing machine head 2 extends on the lower surface of the sewing machine table 3, and a shuttle support 7 for supporting a shuttle 6 corresponding to each sewing machine head 2 on the intermediate frame 8. Is provided. A common shuttle drive shaft 12 rotatably driven by a drive motor 11 fixed on the lower frame 10 is provided through each shuttle support 7. As shown in FIG. 2, the shuttle drive shaft 12 is provided with a drive gear 15 in each shuttle support 7 and meshes with a driven gear 14 provided at the rear end of the shuttle shaft 13 that supports the shuttle 6. Has been done. As a result, when the shuttle drive shaft 12 is rotated in one direction by the drive of the drive motor 11, each shuttle 6 is rotated in a predetermined direction via the drive gear 15 and the driven gear 14.

As shown in FIG. 2, each sewing machine head 2 has a sewing machine arm 16 fixed to the front surface of the upper frame 1.
And a needle bar case 17 supported laterally slidably on the front surface of the sewing machine arm 16. An upper shaft 21 which is driven to rotate in synchronization with the shuttle drive shaft 12 by the drive motor 11 is penetratingly supported by each sewing machine arm 16, and a needle bar drive which will be described later and is connected to the upper shaft 21. A mechanism 22 and a balance driving mechanism 23 are provided respectively. On the other hand, the needle bar case 17 has six needle bars 18 each supporting a sewing needle 18a at its lower end so as to be movable up and down, and a balance 20 corresponding to each needle bar 18 (six in total). ) Is supported by a balance shaft 19 so as to be vertically swingable.

The needle bar drive mechanism 22 is constituted by an eccentric wheel fixed to the upper shaft 21 and each connecting member, and the needle bar 18
A driver element 25, which is reciprocally movable on a guide shaft 24 that is vertically provided at the rear of the, is moved in the vertical direction. On the front surface of the driver element 25, an engagement groove 25a into which a pin 18b protruding rearward is fitted is formed at a substantially central portion of each needle bar 18. The engagement groove 25a is formed so that the pin 18b of the needle bar 18 can be fitted in the lateral direction, and the needle bar corresponding to the front position of the guide shaft 24 by the needle bar selection operation by the sliding operation of the needle bar case 17. The pin 18b of 18 is fitted in the engaging groove 25a, whereby the selected needle bar 18 is vertically reciprocally driven.

Next, the balance driving mechanism 23 will be described. As shown in FIG. 3, each balance 20 has a peripheral surface of a boss portion 20a fitted to the balance shaft 19, and the balance driving mechanism 2
The fitting recess 20b is provided on the side of the drive arm 28 of No. 3 that is directed toward the swing locus. And the balance drive mechanism 23
Is a drive cam 27 having a cam groove 26 formed on one side,
The drive arm 28 is driven by this. The drive arm 28 is of a bell crank shape that is swingably supported by the sewing machine arm 16 by a shaft 29, and a cam follower 30 supported by one lever is the drive cam 2
The roller 31 is fitted in the cam groove 26 of No. 7, and the other lever supports a roller 31 which can be fitted laterally into the recess 20b formed in the boss 20a of the balance 20.

When the sewing machine is stopped, each balance 20 is in the posture shown by the solid lines in FIGS. 2 and 3, and each balance 2 is mounted on the balance rail 32 fixed to the sewing machine arm 16.
By fitting the fitting groove 20c formed in the 0 boss portion 20a, each balance 20 is held in the posture shown by the solid line. Regarding the balance 20 corresponding to the needle bar 18 selected by the sliding operation of the needle bar case 17, the recess 20b of the boss 20a fits into the roller 31 of the drive arm 28 and the fitting groove 20c forms the balance. Corresponding to the cut portion of the rail 32, the rail 32 is in a free state and can be driven by the drive arm 28.

The mounting angle of the drive cam 27 with respect to the upper shaft 21 is displaced by the phase changing mechanism 38 shown in FIGS. 4, 5, 6 and 7, and the phase of the motion of the balance 20 relative to the motion of the shuttle 6 is changed. It is supposed to do.
As shown in FIG. 6, the drive cam 27 is rotatably fitted on the sleeve 33 fitted on the upper shaft 21. The sleeve 33 is provided with a sliding key (three shown) 34 fixed on the outer circumference of the upper shaft 21 while extending in the axial direction.
The upper shaft 21 is arranged such that it cannot rotate in the circumferential direction and can slide in the axial direction. Further, as shown in FIG. 4, the outer peripheral surface is formed with a substantially linear engagement groove 33a extending at a required inclination angle with respect to the axial direction, and at one end thereof, a disc-shaped operation groove is formed. The plate 33b is integrally formed. On the other hand, an engagement pin 35 projecting radially inward is fixed to the boss portion of the drive cam 27, and is projected and engaged with the engagement groove 33 a of the sleeve 33. Further, a ring groove 27a is provided on the outer circumference of the boss portion in the circumferential direction, and the tip of a stopper 37 attached to a bracket 36 fixed to the sewing machine arm 16 is held in a state of protruding into the ring groove 27a. Accordingly, the movement of the drive cam 27 in the axial direction is restricted.

Therefore, when the upper shaft 21 rotates, the sleeve 3
3, the drive cam 27 rotates integrally with the sleeve 33 under the engagement between the engagement groove 33a of FIG. 3 and the engagement pin 35, and the drive arm 28 engaged with the cam groove 26 of the drive cam 27 is shown in FIG. The solid line state and the two-dot chain line state shown in FIG. The swing of the drive arm 28 causes the balance 20 to move.
Is driven to reciprocate between a top dead center position indicated by a solid line and a bottom dead center position indicated by a chain double-dashed line in FIG.

On the other hand, as shown in FIGS. 3 and 6, each sewing machine arm 16 is penetrated by a single control shaft 39 below the drive cam 27 so that the sewing machine arm 16 can move in the left and right directions of the sewing machine in FIG. It is supported. This control shaft 39 has
The operating plate 3 of the sleeve 33 in each sewing machine arm 16
A support block 40 is fixed at a position corresponding to 3b, and each of the support blocks 40 has rollers 41, 41 on a shaft standing parallel to the direction of the upper shaft 21 with the operating plate 33b interposed therebetween.
Are rotatably arranged. Each roller 41, 41
Are arranged in contact with both side surfaces of the operating plate 33b and roll on the side surface of the operating plate 33b which rotates together with the upper shaft 21.

The control shaft 39, as shown in FIG.
The right end thereof is connected to a mover 48 in a drive box 43 fixed to the front surface of the upper frame 1. As shown in FIG. 7, the drive box 43 has two guide bars 46 and 46, which are parallel to the control shaft 39, vertically arranged between two support plates 44 and 45 arranged at a required interval. They are arranged at required intervals. A screw rod 47 is rotatably supported between the guide bars 46, 46, and a right end portion of the screw rod 47 is fixed to the drive box 43.
Is connected to the output shaft of. The mover 48 is arranged so as to be screwed with the screw rod 47 and movable along the guide bars 46, 46, and is moved in the left-right direction by the rotation of the screw rod 47 driven by the control motor 50.

Therefore, by rotating the control motor 50 in the required direction to move the mover 48 in the left-right direction, the sleeve 3 is moved through the control shaft 39 and the support block 40.
3 slides in the required direction with respect to the upper shaft 21 and the drive cam 27, and the engagement pin 35 of the drive cam 27 moves along the engagement groove 33a of the sleeve 33. It is rotationally displaced in the circumferential direction with respect to. Since the upper shaft 21 is rotationally driven in synchronization with the shuttle drive shaft 12 of the shuttle 6, by changing the mounting angle of the drive cam 27 with respect to the drive shaft 21, the phase of the motion of the balance 20 can be changed. Can be changed against.

(Operation of First Embodiment) Next, the operation of the first embodiment will be described. FIG. 8 shows a motion diagram of the needle bar 18, the balance 20, and the shuttle 6 (outer shuttle) with respect to the rotation angle of the upper shaft 21, and the “outer shuttle motion” represents the position (height) of the tip of the sword. . As is clear from the figure, the “balance motion” is set to a predetermined phase with respect to the “outer hook motion” and the “needle bar motion”. There is a predetermined allowable width as shown by a thin line. Within this allowable width, the faster the phase (thick line), the earlier the pulling-up timing of the upper thread, and the thread tightening tends to become loose.The later the phase (thin line), the later the pull-up timing of the upper thread is delayed, and the thread tightening is delayed. Tend to be stronger.

Next, the work procedure for changing the phase of the "balance motion" will be described. When the control motor 50 of the drive box 43 is driven to move the control shaft 39 to the right, for example, while the drive motor 11 is stopped, the sleeve 33 moves to the right as shown by the chain double-dashed line in FIG. It moves and the engaging groove 33a also slides to the right. At this time, since the drive cam 27 is restricted from moving in the axial direction by the stopper 37, the drive cam 27 moves to the left relative to the sleeve 33, so that the engagement groove 33 a moves in the axial direction of the sleeve 33. Since it extends to a required inclination angle with respect to the engaging pin 35 engaging with the engaging groove 33a.
Thus, it rotates in the clockwise direction in FIG.

When the control motor 50 is driven in the reverse direction to move the control shaft 39 to the left, the sleeve 33 moves to the left and the engaging groove 33a also slides to the left. At this time, the drive cam 27 moves to the right relative to the sleeve 33 and rotates counterclockwise in FIG. 6 by the engagement pin 35 engaged with the engagement groove 33a. .

Since the engagement groove 33a is formed in a substantially linear recess, the rotation angle of the drive cam 27 is determined in proportion to the amount of movement of the sleeve 33 with respect to the drive cam 27. By stopping the mover 48 of the box 43 at a predetermined position, the phase of the “balance motion” can be finely adjusted to a desired timing with respect to the motion of the shuttle 6.

In the sewing machine of this embodiment, the control motor 50 of the drive box 43 is driven even while the sewing machine is in operation, and one stitch is formed (one rotation of the upper shaft 21) according to each stitch length. It is also possible to change the phase of the balance 20, and it is possible to perform sewing with an optimum motion of the balance 20 according to the stitch length.

Further, the phase changing mechanism 38 is used for the sewing machine head 2
One support block 40 for moving each sleeve 33 in
Since it can be controlled by the control shaft 39 of the book, there is an advantage that the phase changing work of the balance 20 of all the sewing machine heads 2 can be simultaneously performed by the single control motor 50. Instead of the control motor 50 of the drive box 43, a handle for manual operation may be connected to the screw rod 47 and the screw rod 47 may be rotated by manual operation.

(Regarding the Second Embodiment) FIG. 9 illustrates a second embodiment applied to the sewing machine according to the present invention. The drive cam 55 is rotatably arranged on the upper shaft 21 and has gear-like engagement teeth 55a provided around the end surface of the boss portion thereof. The drive cam 55 is arranged between the drive cam 55 and the collar 56 fitted to the upper shaft 21. The elastic force of the mounted compression coil spring 57 urges it to the left in the drawing. On the left side of the drive cam 55, a drive ring 58 around which engaging teeth 58a capable of meshing with the engaging teeth 55a are fixedly attached to the upper shaft 21, and the coil spring 57 is provided.
By the urging force of the drive cam 55, the drive cam 55 is always in contact with the drive ring 58 so that the engagement teeth 55a, 58a are held in mesh with each other.

The phase changing mechanism 54 in the second embodiment is
It is configured as follows. That is, in the boss portion of the drive cam 55, the side on which the coil spring 57 abuts (see FIG. 9).
A ring groove 55c is provided around the outer periphery of the rod 6 of the solenoid 63 fixed to the sewing machine arm 16.
It is attached to 4. Further, teeth 55b are formed on the outer periphery of the drive cam 55, and a pinion 59 meshes with the teeth 55b. This pinion 59 is for each sewing machine arm 1
6 is fixed to a control shaft 60 that is rotatably supported by penetrating 6 and one end of the control shaft 60 is connected to an output shaft of a control motor 61.

(Operation of Second Embodiment) Next, the operation of the sewing machine of the second embodiment constructed as described above will be described. The drive cam 55 is always arranged as shown in FIG.
The drive ring 58 and the engaging tooth 55 are biased by the coil spring 57.
They are meshed with each other by a and 58a, and are driven and rotated by the upper shaft 21 as the drive ring 58 rotates, and the balance 20 is driven via the drive arm 28. When changing the phase of the motion of the balance 20, when the upper shaft 21 is stopped,
As shown in FIG. 9B, first, the solenoid 63 is excited to retract the rod 64 to move the drive cam 55 to the right in the figure, and the engagement teeth 55a of the drive cam 55 and the drive ring 58 are moved. The engagement with the engaging teeth 58a is released. Then, by driving the control motor 61 to rotate the pinion 59,
The drive cam 55 is rotated in the required direction by the required amount. And
After rotating the drive cam 55 by a desired angle, the excitation of the solenoid 63 is released, and the drive cam 55 is brought into contact with the drive ring 58 by the urging force of the coil spring 57, as shown in FIG. , The engaging teeth 55a and 58a are engaged with each other. By these operations, the phase of the balance can be changed as in the first embodiment.

The phase changing mechanism 54 shown in the second embodiment.
Then, since the solenoid 63 for moving the drive cam 55 is arranged in each sewing machine head 2 and the pinion 59 meshing with each drive cam 55 is connected to one control shaft 60, the balance 20 in all the sewing machine heads 2 is connected. There is an advantage that the single phase change operation can be performed simultaneously by the single control motor 61. A handle for manual operation may be connected to the control shaft 60 instead of the control motor 61, and the pinion 59 may be rotated by manual operation.

In each of the above embodiments, a multi-head type (multi-needle multi-head)
Although the embroidery machine applied to the embroidery machine has been illustrated, the present invention is not limited to this, and the multi-needle single-head type, the single-needle multi-head type, the single-needle single-head type embroidery machine, and general industrial and household sewing machines Can also be applied to.

[0030]

As described above, according to the sewing machine according to the present invention, the phase of the motion of the balance can be easily changed by the phase changing mechanism, and the phase of the motion of the balance can be changed according to the properties of the thread and the properties of the material to be sewn. Or, since the optimum balance motion can be set according to the texture to be obtained, it is possible to create various sewing products that meet diversified needs. Further, in the multi-head type sewing machine, since the phase changing mechanism arranged in each sewing machine head can be simultaneously controlled by the single control means, the phase changing work of the motion of the balance can be performed more quickly and easily.

[Brief description of drawings]

FIG. 1 is a front view of a multi-head embroidery sewing machine according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a sewing machine head and a shuttle support.

FIG. 3 is an explanatory diagram showing a state in which a balance is driven by a balance driving mechanism.

FIG. 4 is a plan view showing a drive cam and a phase changing mechanism partially broken away.

5 is a vertical cross-sectional view showing the drive cam and the phase changing mechanism, taken along the line AA in FIG.

6 is a side sectional view showing a drive cam and a phase changing mechanism, taken along the line BB in FIG.

FIG. 7 is a front view showing a partially broken structure of a drive box.

FIG. 8 is a motion diagram for explaining each operation of the needle bar, the balance, and the shuttle.

FIG. 9 is an operation explanatory view showing the main parts of the drive cam and the phase changing mechanism of the sewing machine according to the second embodiment of the present invention in a broken manner.

[Explanation of symbols]

6 hook 12 hook hook drive shaft 16 sewing machine arm 20 balance 21 drive shaft (upper shaft) 27,55 drive cam 27a ring groove 33 sleeve 33a engaging groove 33b operating plate 35 engaging pin 37 stopper 38,54 phase changing mechanism 39,60 Control shaft 40 Support block 41 Roller 48 Mover 50,61 Control means (control motor) 55a, 58a Engaging tooth 55b Tooth 55c Ring groove 57 Coil spring 58 Drive ring 59 Pinion 62 Engaging piece 63 Electromagnetic solenoid 64 Rod

Claims (6)

[Claims] 1. A sewing machine in which a balance (20) is driven by a drive shaft (21) that is driven in synchronization with a shuttle drive shaft (12) that rotationally drives a shuttle (6). ) And a drive cam (27, 55) for reciprocally driving the balance (20), and the drive cam (27, 55) is rotated in the circumferential direction with respect to the drive shaft (21). Phase change mechanism that can set a desired mounting angle
(38,54), and the phase changing mechanism (38,54) by the required driving means (50,61)
To drive the drive cams (27, 55) to the drive shaft (2
A sewing machine characterized in that the phase of the motion of the balance (20) can be changed with respect to the motion of the shuttle (6) by adjusting and displacing to a desired mounting angle with respect to 1). 2. The driving cam (27) is a sewing machine arm (16).
The stopper (37) attached to the drive cam (27) and the ring groove (27a) provided around the boss of the drive cam (27) may be engaged with each other to prevent the drive shaft (21) from moving in the axial direction. The sewing machine according to claim 1. 3. The phase change mechanism (38) has a sleeve that is external to the drive cam (27) and is not rotatable in the radial direction with respect to the drive shaft (21) and slidable in the axial direction. (33) and a substantially linear engagement groove extending on the outer periphery of the sleeve (33) at a required inclination angle with respect to the axial direction of the drive shaft (21).
(33a) and an engagement pin (3) that protrudes radially inward from the boss portion of the drive cam (27) and is movably engaged with the engagement groove (33a).
5), a support block (40) having rollers (41, 41) located near the operating plate (33b) of the sleeve (33) and engaging with both side surfaces of the operating plate (33b), Support the support block (40) so that it cannot
A control block (39) connected to a mover (48) that can be reciprocated by (50), and requires a support block (40) fixed to the control shaft (39) by driving the control motor (50). By moving in the direction, the sleeve (33) slides in the required direction with respect to the drive cam (27) and the drive shaft (21), and the engagement pin (35) moves along the engagement groove (33a). The sewing machine according to claim 1 or 2, wherein the sewing machine is moved, and the drive cam (27) is rotationally displaced with respect to the drive shaft (21) in the circumferential direction accordingly. 4. The drive cam (55) is arranged so as to be rotatable with respect to the drive shaft (21), and the drive shaft is always provided by an elastic body (57).
It is held in contact with the drive ring (58) fixed to (21), and the engagement tooth (58a) of the drive ring (58) meshes with the engagement tooth (55a) of the drive cam (55). 2. The sewing machine according to claim 1, which is driven to rotate below the drive shaft (21). 5. The phase change mechanism (54) is fixed to the sewing machine arm (16) and engages with an engagement piece (62) that engages with a ring groove (55c) provided around the boss of the drive cam (55). ) Connected to the electromagnetic solenoid (63), the control shaft (60) that extends parallel to the drive shaft (21) and is rotated by the control motor (61), and is fixed to the control shaft (60), It consists of a pinion (59) that meshes with the teeth (55b) formed on the outer circumference of the drive cam (55), and the electromagnetic solenoid (63) is excited to cause the electromagnetic solenoid (6
Pull back the rod (64) of 3), drive ring (58) and drive cam (55).
Are separated from each other to disengage the engagement teeth (58a, 55a), and then the control motor (61) is driven in the required direction to rotate the pinion (59) to move the drive cam (55) to the drive shaft (21 ), The electromagnetic solenoid (63) is de-excited, and the drive ring (58) and the drive cam (55) are again engaged with their respective engagement teeth.
(58a, 55a), the balance (20)
The sewing machine according to claim 1, wherein the phase of the motion of the sewing machine can be changed with respect to the motion of the shuttle (6). 6. In a multi-head sewing machine having a plurality of sewing machine heads (2), a phase changing mechanism (38, 54) is provided for each sewing machine head (2), and the phase changing mechanism (38, 54) is provided. Control axis
(39, 60) is connected to a single control motor (50, 61), and this control motor (50, 61) controls the phase of the motion of each balance (20) simultaneously with respect to the motion of the shuttle (6). The sewing machine according to any one of claims 1 to 5, which is possible.