JP3486071B2 - sewing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine for synchronously controlling a shuttle drive motor so as to drive a main shaft and a spool for catching a wheel independently while rotating the shuttle for catching a thread wheel in synchronization with the spindle. In particular, the present invention relates to a thread loop catching hook which is prevented from stopping rotation by cutting when an excessive thread loop generated at the start of sewing is caught in a thread guide portion of a thread guide body of an outer hook.

[0002]

2. Description of the Related Art Conventionally, sewing machine bodies such as embroidery sewing machines have
Mainly composed of bed, pedestal and arm,
A main shaft driven by a sewing machine motor is arranged in the arm portion,
The needle bar to which the sewing needle is attached and the balance are vertically driven by the rotation of the main shaft thereof. Further, in the bed portion, a lower shaft and a full rotary hook for catching the upper thread loop, which cooperates with the sewing needle to catch the upper thread loop, are arranged. The lower shaft is connected to the main shaft, and the main shaft rotates once. Two
It is designed to be rotated. Here, in the full rotary hook, a bobbin case with a bobbin wound with a bobbin thread is attached and the rotation of the inner hook is stopped on the outside of the inner hook via the hook shaft rotated by the lower shaft. It is designed to be driven to rotate in synchronization with the rotation of.

Further, the outer hook is formed with a sword tip for catching the upper thread extending from the eyelet of the sewing needle, and a curved thread guide body having a thread guide portion facing the outside of the sword tip at the forward position. It is attached integrally. Then, at the time of starting sewing with the embroidery sewing machine or restarting sewing after thread breakage occurs, the thread end of the upper thread is hooked on a predetermined thread hook or the thread end is held by a finger. In this state, operate the sewing start switch.

As a result, the outer hook is rotated in a predetermined rotation direction through the rotation of the lower shaft connected to the main shaft, and the upper thread caught by the sword at the encounter position when the sewing needle rises from the lowermost position causes the upper thread to sword tip. While moving to the trailing side of the inner hook, the engagement width is widened so as to intersect the annular rib formed on the outer peripheral surface of the inner hook to form the upper thread loop, which is formed in the gap between the sword tip and the thread guide portion. With the upper thread loop engaged with the thread engaging portion engaged with the forward end of the annular rib, the required amount of thread is supplied by the descending balance, and the cloth side upper thread of the upper thread loop is The upper thread loop is expanded by advancing in synchronization with the thread guide section by the joining section, and when the upper thread loop is disengaged from the inner hook, the upper thread loop is entangled with the lower thread extending from the bobbin case, raising the balance and feeding the cloth. By the execution, the upper thread loop is absorbed and thread tightening is executed.

By the way, the lower shaft for driving the yarn wheel catching hook (all-rotary hook) for catching the yarn wheel is replaced with a vertical shaft driving type which is driven by being connected to a main shaft for vertically driving a sewing needle and a balance.
By driving the thread catcher with a dedicated drive motor independently of the sewing machine spindle, the thread catcher can be driven synchronously with the sewing machine spindle while the thread catcher keeps moving according to the sewing conditions. A hook-and-shaft independent drive type sewing machine capable of controlling a rotating state is disclosed in Japanese Patent Application Laid-Open No. 60-21750 and Japanese Patent Application Laid-Open No.
It is proposed in Japanese Patent No. 234291.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
When starting sewing with the hook shaft independent drive type embroidery sewing machine proposed in Japanese Laid-Open Patent Publication No. 750, JP-A-3-234291, etc., forgetting to hook the upper thread end on the thread hook, When you start sewing with the
As described above, the amount of thread required to expand the upper thread loop captured by the sword is supplied not only from the thread end with less movement resistance but also from the descending balance, so the upper thread is slack. When the upper thread loop comes off from the inner hook, only the loose thread amount is absorbed when performing thread feeding and tightening the thread by raising the balance. Will remain under the needle plate as an extra thread loop.

When the surplus yarn wheel is caught by the acute-angled guide portion formed at the forward position of the yarn guide body which is rotating next time, the hook drive motor is downsized, and the excess yarn wheel is caught. If there is not enough rotational torque to tear off the upper thread, the outer hook will stop at an arbitrary rotational position, which causes a problem of colliding with the descending sewing needle. In this case, it is conceivable to employ a large hook drive motor capable of tearing off the hooked needle thread, but in that case, a large space for accommodating the hook drive motor is required, and the cylinder bed portion becomes large, There are problems such as high power consumption and high cost.

An object of the present invention is to provide a sewing machine which can easily cut an excess yarn wheel caught on an acute-angled yarn guide portion formed on a yarn guide body even with a small-sized hook drive motor having a small rotating torque. It is to be.

[0009]

According to a first aspect of the present invention, there is provided a sewing machine including a sewing needle driven by a sewing machine motor via a main shaft, a sword tip that cooperates with the sewing needle to catch a thread wheel, and a needle thread engaged with the sword tip. A thread guide having a sharp-angled thread guide for guiding the
A loop taker which is provided integrally, in a sewing machine that includes a shuttle drive motor for rotating in synchronism with the independent to the main shaft and the sewing machine motor loop taker, occur at the sewing start
A thread cutting blade for cutting an excess thread wheel engaged with the thread guide section is formed at an edge of the thread guide section opposite to the thread guide edge on the sword tip side.

When sewing is started on the sewing machine, the sewing needle is moved up and down by the main shaft driven by the sewing machine motor, and the outer hook of the thread catching hook is rotationally driven by a special hook driving motor in synchronization with the main shaft. When the thread end portion of the upper thread is free and the upper thread loop formed at the first stitch is slack when the thread feed is performed and the thread is tightened by raising the balance, The upper thread loop is not fully absorbed,
When the surplus yarn wheel is caught by the sharp angled yarn guide portion formed at the forward position of the yarn guide body that rotates next time, the rotation torque of the shuttle drive motor becomes small. However, the surplus thread wheel can be easily cut by the thread cutting blade formed in the thread guide portion to continue the sewing process without stopping the rotation of the outer hook.

Further, since the thread cutting blade is formed on the edge of the thread guide portion on the side opposite to the thread guide edge on the sword tip side, the thread loop of the upper thread caught by the sword tip of the outer hook is of the outer hook. At the time of forming a normal upper thread loop, which moves to the trailing side of the sword tip while being guided by the thread guiding edge of the thread guiding portion as it rotates,
Only when the upper thread loop is not cut and the surplus thread loop is caught by the thread guide portion, the surplus thread loop can be reliably cut.

A sewing machine according to a second aspect of the present invention is the sewing machine according to the first aspect of the present invention, in which the thread guide body is provided with a locking portion for hooking the excess thread loop at the position of the trailing end in the rotation direction of the thread cutting blade. . In this case, the surplus thread loop caught in the thread guide portion is not cut by the thread cutting blade formed in the thread guide portion, and even if the thread cutting blade is moved, it is formed in the thread guide body. As the outer hook rotates, the tension applied to the excess yarn wheel increases and the yarn cutting blade near the locking portion reliably cuts the yarn.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a multi-head embroidery sewing machine including three embroidery sewing machines, and in each of the embroidery sewing machines, all rotary hooks for catching the thread ring are rotationally driven by a hook drive motor independently of the sewing machine motor. This is a case where the present invention is applied. The multi-head embroidery sewing machine M will be described. As shown in FIG. 1, a sewing machine support plate 2 having a predetermined length in the left-right direction and having a predetermined length in the left-right direction is provided on the rear side of the upper surface of a base frame 1 extending in the left-right direction. And a support frame 3 extending in the left-right direction is erected at the rear end portion of the sewing machine support plate 2.
In addition, the three head portions 4 to 6 are juxtaposed in the left-right direction at predetermined intervals, and the base frame 1 located at the front end portion of the sewing machine support plate 2 corresponds to each of the head portions 4 to 6. The rear end portions of the cylindrical bed portions 7 to 9 formed in the bed units 10 to 12 are respectively supported.

That is, three multi-needle type embroidery sewing machines M1 to M3, which are composed of heads 4 to 6 provided on the support frame 3 and bed units 10 to 12 having an independent structure, are arranged in parallel. At the front end of each of the head portions 4 to 6 of the embroidery sewing machines M1 to M3, twelve needle bars (not shown) arranged in a row in the left-right direction and having sewing needles 22 attached to the lower ends can be moved up and down. The needle bar cases 20 that support the 12 scales 23 in a swingable manner are supported so as to be movable in the left and right directions, and each needle bar case 20 is driven by a needle bar changing motor (not shown). By a needle bar changing mechanism (not shown), the needle bars can be simultaneously moved in the left-right direction and changed to different embroidery threads having different thread colors at the same time.

Further, a sewing machine spindle 1 driven by a sewing machine motor (not shown) is provided at the front end of each of the head portions 4 to 6.
In addition to a needle bar vertical drive mechanism (not shown) for vertically moving the needle bar by 7, a needle bar jump mechanism (not shown) for jumping the needle bar to its uppermost position is provided. On the other hand, the bed units 10 to 12 are provided on the front side of the sewing machine support plate 2.
A work table 13 is horizontally arranged so as to be at the same height as the upper surface of the work table 13. The work table 13 is included in the work table 13. A pair of auxiliary tables 14 and 15 are provided on both left and right sides of the work table 13. A movable frame 16 having a rectangular frame shape in plan view extending in the left-right direction is placed.

The drive frame portion 16a at the left end of the movable frame 16 is moved and driven in the Y-axis direction (front-back direction) by a Y-axis drive mechanism (not shown), and the drive frame portion 16b at the right end thereof is formed. This drive frame portion 16a is moved and driven in the X-axis direction (left-right direction) by an X-axis drive mechanism (not shown).
Therefore, the movable frame 16 can be moved on the XY plane by the X-axis drive mechanism driven by the X-axis drive motor (not shown) and the Y-axis drive mechanism driven by the Y-axis drive motor (not shown). Has become. Further, on the rear side of the auxiliary table 15, there is a display 18 for displaying a message regarding embroidery sewing.
An operation panel 18 having a and executing various commands is provided.

Next, the bed units 10 to 12 will be described with reference to FIGS. Since the three bed units 10 to 12 have the same configuration, the leftmost bed unit 10 will be described. A bed case 40 having a substantially U-shaped cross section extending in the front-rear direction has a pair of support brackets 4 fixed to a base frame 1 extending in the left-right direction at the front end of the sewing machine support plate 2 at its rear end.
1, and a hook module 50 is detachably fixed to the front end portion of the bed case 40. here,
The upper side of the bed case 40 is covered at its front end portion with a needle plate 42 having a needle hole 42a and a cover plate 43 which is continuous with the needle plate 42 and extends in the front-rear direction.

Next, the shuttle module 50 will be described. As shown in FIGS. 3 to 4, a mounting block 51 is detachably fixed to the front end portion of the bed case 40 with screws 52, and a shuttle drive motor composed of a pulse motor is provided on the rear end side of the mounting block 51. 53 is attached. On the other hand, on the front end side of the mounting block 51, a full rotary hook 55 for catching the yarn wheel is provided, and a hook shaft 60 fixed to the full rotary hook 55 is pivotally mounted on the attachment block 51 so that the position thereof can be adjusted in the front-rear direction. It is supported. The first connecting member 62 attached to the rear end of the shuttle shaft 60 and the second connecting member 63 attached to the front end of the drive shaft 53a of the shuttle drive motor 53 are connected to each other. That is, the shuttle shaft 60 and the drive shaft 53a are connected by the coupling 61 including both connecting members 62 and 63.

A brief description of the full-rotary hook 55 will now be given. As shown in FIGS. 6 and 7, an inner hook 57 that holds a bobbin case 56 that accommodates a bobbin and that is prevented from rotating.
An outer hook 58 that rotates outside the inner hook 57 is provided, and an upper thread 47 is hooked on the outer hook 58 and the upper thread loop 47 is formed.
A sword tip 58a for forming a is formed, and an acute-angled thread guide portion 59a facing the outside of the sword tip 58a.
A curved thread guide body 59 having a forward position is integrally attached. The shuttle shaft 60 is driven by the shuttle drive motor 53.
By rotating the outer hook 58 with the sewing needle 22 in a predetermined rotation direction via the sewing machine, the sewing needle 2
The upper thread 47 extending from the second eye hole is captured by the sword tip 58a.

The captured upper thread 47 has the sword tip 5
While moving to the trailing side of 8a, the engagement width is widened so as to intersect the annular rib 57a formed on the outer peripheral surface of the inner hook 57, and the needle thread loop 47a is formed.
Thread engaging portion 58b formed in a gap between the thread guiding portion 59a and the thread guiding portion 59a.
With the upper thread loop 47a engaged with the upper thread loop 47a being engaged with the forward end of the annular rib 57a, the required amount of thread is supplied by the descending balance 23, and the upper thread 47 on the cloth side of the upper thread loop 47a is supplied.
Moves forward in synchronization with the thread guide portion 59a at the thread engaging portion 58b, whereby the upper thread loop 47a is enlarged, and the upper thread loop 4a is expanded.
When 7a comes off the inner hook 57, the bobbin case 56
The upper thread loop 47a is entangled with the lower thread 48 extending from the upper thread loop 23a and the upper thread loop 47a is absorbed by the lifting of the balance 23 and the cloth feeding, whereby thread tightening is executed.

Further, a disc encoder 64 is attached to the second connecting member 63, and a plurality of slits formed in the disc encoder 64 are optically detected to output a shuttle shaft rotation signal from a photo sensor. Become second
The encoder sensor 65 is attached to the attachment block 51. Then, by driving the shuttle drive motor 53, the shuttle shaft 60 is rotationally driven via the drive shaft 53a and the coupling 61, and the full rotary shuttle 55 is rotated in a predetermined rotation direction in synchronization with the rotation speed of the sewing machine motor. The sewing machine main shaft 17 is driven to rotate at twice the rotational speed. Here, the front end portion of the bed unit 10 is covered with a protective cover 66 that is pivotally supported at the lower end of the front end portion of the bed case 40 so as to be openable and closable via a hinge mechanism.

By the way, the thread guide portion 5 of the thread guide body 59.
9, a thread cutting blade 59c having a predetermined length is formed on an edge of the blade tip 58a opposite to the thread guiding edge 59b, and the thread guiding body 59 further has a trailing end in the rotation direction of the thread cutting blade 59c. The position of the blade-shaped locking portion 59d
Are formed. That is, at the start of sewing, the formed upper thread loop 47a is not sufficiently absorbed and the surplus thread loop 4a is
When the surplus yarn wheel 47b is caught by the yarn guide portion 59 when it remains as 7b, the surplus yarn wheel 47b is cut by the thread cutting blade 59c or the locking portion 59d.

Here, a pivotal support structure for pivotally supporting the full rotary hook 55 so that its position can be adjusted in the front-rear direction will be briefly described. Immediately inside the cylindrical portion of the mounting block 51, a cylindrical bearing case 70 is provided slidably in the front-rear direction, and a bearing 71 is press-fitted into the bearing case 70. Then, the eccentric pin 72 is attached to the left side wall portion of the attachment block 51, and
The pin portion at the tip of the eccentric pin 72 is the bearing case 7.
0 is engaged with a vertically elongated pin hole formed on the left side wall,
On the other hand, a set screw 73 capable of fixing the bearing case 70 is detachably provided on the right side wall portion of the mounting block 51.

That is, by loosening the set screw 73 and rotating the eccentric pin 72 in the clockwise direction or the counterclockwise direction, the bearing case 70 is moved forward or backward by a minute distance (for example, 1 to 1) through the pin hole. 2 mm), and at the same time, the position of the entire rotary hook 55 can be finely adjusted in the front-rear direction to adjust the needle gap. Next, a thread cutting mechanism 80 that is provided in each of the bed units 10 to 12 and cuts the upper thread 47 and the lower thread 48 will be briefly described with reference to FIGS. 5 and 6. A movable blade 81 is provided on the lower surface of the needle plate 42.
5 is pivotally supported so as to be swingable between a standby position shown by a solid line in FIG. 5 and a rotating position shown by a two-dot chain line.

Then, in cooperation with the movable blade 81, the upper thread 4
7 and the lower thread 48 are fixed blades 82 for cutting the movable blade 8
It is attached to the lower side of the needle plate 42 so as to face the upper side of 1. On the other hand, the thread trimming operation lever 83 connected to the movable blade 81 is inserted through the bed case 40 and extends rearward. Then, when the thread trimming motor 85 provided at the left end of the base frame 1 is driven, the thread trimming operation shaft 8 is oscillated through the swing of the fan-shaped swing member 87 that meshes with the drive gear 86.
8 moves in the left-right direction, the thread-cutting operating lever 83 moves in the front-back direction via the rotating plate 84, and the upper and lower threads 47, 48 are simultaneously cut by the rotation of the movable blade 81.

Next, the surplus yarn wheel 47 generated at the start of sewing
The action of cutting the surplus yarn loop 47b when b is caught by the yarn guide portion 59a of the rotating yarn guide body 59 will be described. After the sewing machine main shaft 17 and the shuttle shaft 60 are initialized by operating the sewing start switch of the operation panel 18, the sewing machine motor and the shuttle drive motor 53 are operated based on the embroidery data created in advance. The multi-head embroidery sewing machine M starts sewing under the synchronous drive control.

When the embroidery sewing is performed, for example, in the left multi-needle type embroidery sewing machine M1, when the upper thread 47 is broken and the driving of the sewing machine motor is stopped, the sewing needle 22 of the embroidery sewing machine M1 is stopped. If you forget to hang the thread end of the needle thread 47 extending from the eyelet hole of the sewing needle 22 on a predetermined thread hook by passing the needle thread 47 through the needle thread and restart sewing with the needle thread end free, At the timing, as shown in FIG. 7, the needle thread loop 4 captured by the sword tip 58a
The yarn amount necessary for enlarging 7a is supplied not only from the yarn end side where movement resistance is small, but also from the descending balance 23, so that the upper yarn 47 becomes loose and the upper yarn loop 47a When it is disengaged from the inner hook 57, only the loose thread amount is absorbed and the upper thread loop 47a which is not sufficiently absorbed is used as an extra thread ring 47d in the thread tightening by executing the cloth feed and raising the balance. The needle plate 42 remains below the needle plate 42.

Then, as shown in FIGS. 6 and 8, when the surplus yarn wheel 47b is caught by the acute-angle-shaped yarn guide portion 59a of the yarn guide body 59 which rotates next time, the surplus yarn wheel 47b is Since the thread cutting blade 59c formed on the thread guide portion 59a is moved under tension applied by the rotation of the outer hook 58, the excess thread wheel 47b is easily cut by the thread cutting blade 59c, Without stopping the rotation of 58
The sewing process can be continued. By the way, when the tension of the surplus yarn wheel 47b caught on the yarn guide portion 59a is weak, even if the surplus yarn wheel 47b is not cut when moving the yarn cutting blade 59c, the surplus yarn wheel 47b is locked by the locking portion 5.
The tension applied to the excess yarn wheel 47b is increased by being hooked at 9d, and the thread cutting blade 59c near the locking portion 59d or the blade-shaped locking portion 59d is surely cut.

As described above, the thread guide portion 59 of the thread guide body 59.
Since the thread guide blade 59a is formed with the thread cutting blade 59c for cutting the surplus thread ring 47b generated at the start of sewing which is engaged with a, the upper thread loop formed when the sewing is started by the embroidery sewing machines M1 to M3. Even when the surplus yarn loop 47b is generated due to the looseness of 47a and is caught by the acute-angle-shaped yarn guide portion 59a of the yarn guide body 59, the surplus yarn loop is formed by the yarn cutting blade 59c formed in the yarn guide portion 59a. 47b can be easily cut, and the sewing process can be continued without stopping the rotation of the shuttle drive motor 53.

The thread cutting blade 59c has a thread guiding portion 5
Since it is formed on the edge of 9a on the side opposite to the thread guide edge 59b on the sword tip side, the upper thread loop 47a of the upper thread 47 caught by the sword tip 58a of the outer hook 58 is rotated by the outer hook 58.
The upper thread loop 47a is not cut during the formation of the normal upper thread loop 47a which moves to the trailing side of the sword tip 58a while being guided by the thread guiding edge 59b of the thread guiding portion 59a, and the surplus thread loop 47b is caught by the thread guiding portion 59a. Only when the surplus yarn wheel 47b is cut, the surplus yarn wheel 47b can be reliably cut.

Further, the thread guide 59 is attached to the thread cutting blade 59.
Since the locking portion 59d for hooking the surplus yarn wheel 47b is formed at the position of the trailing end of the rotational direction c, the surplus yarn wheel 47b caught in the yarn guiding portion 59a is cut by the thread cutting portion formed in the yarn guiding portion 59a. Even if the thread cutting blade 59c is moved without being cut by the blade 59c, the locking portion 59d
The rotation of the outer hook 58 causes the tension applied to the surplus yarn wheel 47b to cause the thread cutting blade 59c near the engaging portion 59d or the engaging portion 59d to move the excess yarn wheel 47b.
Can be cut reliably.

Here, as a modification of the above embodiment,
As shown in FIG. 9, a thread cutting blade 59f is formed in an acute-angled thread guiding portion 59e of the thread guiding body 59A, and at the position of the trailing end in the rotation direction of the thread cutting blade 59f, the thread guiding body 59A is provided with The locking portion 59g having a thread cutting blade may be formed in a protruding shape. In this case as well, even when the excess yarn wheel 47b is not cut when the yarn cutting blade 59f is moved, the excess yarn wheel 47b is hooked by the locking portion 59g and the tension acting on the excess yarn wheel 47b increases. The thread cutting blade 59f in the vicinity of the engaging portion 59g or the engaging portion 59g is surely cut. Further, various modifications may be made to the above-described embodiment based on existing technology or technology obvious to those skilled in the art. Further, it is needless to say that the present invention can be applied to various sewing machines which are provided with one embroidery sewing machine and in which the thread catcher hook is driven independently of the sewing machine motor.

[0033]

According to the sewing machine of the first aspect, the sewing needle driven by the sewing machine motor through the main shaft, the sword tip that cooperates with the sewing needle to capture the thread wheel, and the upper thread engaged with the sword tip are guided. A thread guide with a sharp angle thread guide is integrated with the outer hook .
In the loop taker provided in a sewing machine and a shuttle drive motor for rotating in synchronism with the independent to the main shaft and the sewing machine motor loop taker, the yarn guide occur at sewing start
Since the thread cutting blade that cuts the excess thread loop engaged with the sewing section is formed in the thread guide section, when the sewing is started with the sewing machine, the formed upper thread loop is loosened, and the excess thread loop is generated. Thus, even when the yarn guide body is caught in the acute-angled yarn guide portion, the excess yarn wheel can be easily cut by the yarn cutting blade formed in the yarn guide portion, without stopping the rotation of the shuttle drive motor.
The sewing process can be continued.

Since the thread cutting blade is formed on the edge of the thread guide portion opposite to the thread guide edge on the sword tip side, the thread loop of the upper thread caught by the sword tip of the outer hook is rotated by the outer hook. The upper thread loop is not cut during the formation of the normal upper thread loop that moves toward the trailing side of the sword while being guided by the thread guiding edge of the thread guiding section, and only when the excess thread loop is caught in the thread guiding section. , The surplus yarn wheel can be reliably cut.

In the sewing machine of claim 2, the same effect as that of claim 1 is obtained, but a locking portion for hooking the surplus thread loop at the position of the trailing end of the thread cutting blade in the rotation direction is provided on the thread guide body. Since the excess thread loop caught on the thread guide portion is not cut by the thread cutting blade formed on the thread guide portion and passes through the thread cutting blade, the excess thread loop formed on the thread guide body is formed. The extra thread loop is caught by the stopper, and the excess thread wheel can be reliably cut by the thread cutting blade portion in the vicinity of the locking portion due to the tension applied to the excess thread wheel by the rotation of the outer hook.

[Brief description of drawings]

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

FIG. 2 is a plan view of relevant parts showing a work table and a bed unit.

FIG. 3 is a partial plan view of a bed unit provided with a shuttle module.

FIG. 4 is a partial vertical sectional side view of a bed unit provided with a shuttle module.

FIG. 5 is a partially enlarged plan view of the leading end of the bed unit.

FIG. 6 is a front view of a full rotary hook.

FIG. 7 is an enlarged plan view of a full rotary hook.

FIG. 8 is a diagram when the excess yarn wheel is caught in the yarn guide portion.
FIG.

FIG. 9 is a plan view of a thread guide body according to a modification.

[Explanation of symbols]

M Multi-head embroidery sewing machine 17 sewing machine spindle 22 sewing needles 47 Upper thread 47a Upper thread loop 47b Surplus thread loop 53 hook drive motor 55 full rotary hook 58 Outer pot 58a sword tip 59 Thread guide 59a Thread guide 59c thread cutting blade 59d locking part

Claims (2)

(57) [Claims] Has a needle driven through the spindle, the acute angle of the thread guide portion for guiding the upper thread engaged with the loop-taker point of the loop-taker point Toko capturing the yarn wheel and the sewing needle and cooperates with 1. A sewing machine motor In a sewing machine including a yarn wheel catching hook in which a thread guide body is integrally provided in an outer hook, and a hook drive motor for rotationally driving the yarn wheel catching hook independently of a sewing machine motor in synchronization with a main shaft, A sewing machine, characterized in that a thread cutting blade for cutting an excess thread wheel which is generated at the start of sewing and which engages with the thread guide portion is formed on an edge of the thread guide portion opposite to a thread guide edge on a sword tip side. . 2. The sewing machine according to claim 1, wherein the thread guide body is provided with a locking portion for hooking the surplus thread loop at a position of a trailing end of the thread cutting blade in the rotation direction.