JP2002052288A - Multiple color embroidery sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pass only threads being used from among multiple kinds of color threads through a needle thread take-up and a sewing needle by simply feeding air, simplify the structure, shorten a period of time required for a thread replacement, and at the same time, effectively utilize the stream of air. SOLUTION: This multiple color embroidery sewing machine is equipped with a function wherein multiple kinds of color threads are automatically passed by utilizing the stream of air. Such a multiple color embroidery sewing machine is equipped with a thread pulling in device, a thread accepting body 64, vertical thread guiding paths 70 and 74, an air feeding device, the needle thread take-up 18, and a thread passing device 90. In this case, the thread pulling in device can respectively individually and selectively pull in respective color threads (needle threads Y) by a specified length. The thread accepting body 64 respectively accepts the color threads which have passed the thread pulling in device, and guides them downward. The vertical thread guiding paths 70 and 74 guide the color threads which are fed from the thread accepting body 64 to a jetting port 78 which is opened in the vicinity of a sewing needle 16 of the sewing machine. The air-feeding device can feed air which flows toward the jetting port 78. The needle thread take-up 18 can position a thread port 21 to a gap 75 which is provided on the thread guiding paths 70 and 74 under a state wherein the thread port 21 is adjusted to the thread guiding paths. The thread passing device 90 can pass the color thread, which are blown out by air from the jetting port 78 on the thread guiding paths, through the eye of the sewing needle 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables multicolor embroidery by selectively using different colors of yarn (upper yarn).
The present invention relates to a multicolor embroidery sewing machine having a function of automatically passing a thread through a balance and a sewing needle when changing the thread of the color thread.

[0002]

2. Description of the Related Art A multi-color embroidery sewing machine of this type has a plurality of sewing needles provided on a single sewing head, each having a thread of a different color passed through, and selectively driving these sewing needles. For example, there is a type in which a thread is changed by re-threading various colored threads through one sewing needle. The number of sewing needles in the latter type is not necessarily
Not only one but also several sewing needles may be provided, but in any case, the number of color threads to be used is greater than the number of sewing needles. The format you need.

In the latter type, a thread is automatically passed through a balance and a sewing needle when the thread is changed. As an apparatus for this, for example, Japanese Patent Application Laid-Open No. Sho 53-123257.
The technique disclosed in Japanese Patent Application Publication No. H11-264, is known. With this technology,
A thread holding table provided with a plurality of thread spools of different colors so as to be capable of feeding out the respective color threads is slid in a linear direction or a rotating direction with respect to the sewing machine head. A pipe is provided between the thread holder and one sewing needle located below the sewing head, and air is supplied into the pipe.

[0004] In changing the yarn, each color yarn being unwound from each of the yarn spools is selectively guided into the pipe by sliding the yarn holding table, and air is supplied into the pipe to change the yarn. To the sewing needle side. On the sewing needle side, an end having a thread hole of a balance at a threading position beyond a normal reciprocating rotation range, and a threading machine for passing a thread through the hole of the sewing needle are respectively located. I have. Then, the thread sent by air is blown out from the outlet of the pipe, and the thread is passed through the thread hole of the balance and the threading machine through the hole of the sewing needle.

Japanese Patent Laid-Open Publication No. Sho 51-30044 or No. 51-0044 discloses a technique in which a thread is passed through a thread hole in a state where a balance is positioned within a rotation range during normal sewing.
It is disclosed in, for example, Japanese Patent Publication No. -9048. In this technique, a pipe through which a color thread is sent by air is bent, for example, horizontally in the middle thereof, and a thread hole of a balance is positioned in a gap provided therewith in a state of being aligned with the pipe.

[0006]

In the above-mentioned prior art, the yarn holding table is slid as a means for selecting a yarn to be used from various kinds of color yarns. A mechanism for guiding to the entrance of the pipe is required. As a result, the structure of the automatic threading device becomes complicated, and it takes time to change the thread. In the configuration in which the thread holding table is fixed and the thread is selected by sliding an adjusting table provided with a tension member and a thread path, the thread may become entangled between each thread spool and the adjusting table. is there. In the case of a structure in which the pipe is bent halfway for passing the thread through the balance, there is a disadvantage in that a loss of air flow occurs.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to make it possible to pass only a thread to be used out of various kinds of color threads through a balance and a sewing needle only by supplying air. And the time required for thread change is reduced, and the air flow can be effectively used.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the invention according to claim 1 is capable of performing multicolor embroidery with various kinds of color yarns, and using these color yarns. A multi-color embroidery sewing machine having a function of automatically passing a color thread using an air flow when changing a thread for selective use, wherein the color threads are individually and selectively predetermined. , A thread acceptor that receives each color thread that has passed through the thread applicator and guides the thread downward, and a color thread fed from the thread acceptor into the sewing machine. A vertical thread guide path for guiding to an ejection port opened near the sewing needle, an air supply device capable of supplying air flowing toward the ejection port, and a thread provided in the gap provided in the thread guide path. Position the hole aligned with the yarn guide path Bets is provided with a balance capable, and said yarn color yarn blown by the air from the ejection outlet of the guide path threading capable to pass the hole of the sewing needle device.

According to the above construction, each of the color yarns is received by the yarn receiving body, and when changing the yarn, only the air is supplied by the air supply device.
Only one color thread in which the thread pulling device of the thread pulling device is open can be passed through a thread hole of a balance positioned in the gap, and the color thread is sewn by the threading device. Through the hole. Therefore, unlike the conventional method in which the thread holding table or the adjusting table is slid to select the color thread, the structure for threading is simplified and the time required for thread change is also reduced. Further, since the thread guide path can be threaded through the thread hole of the balance while keeping the substantially straight vertical position, the thread guide path is partially oriented, for example, horizontally so as to pass the thread through the thread hole of the balance. The air flow can be used more effectively than in the case of a bent structure, and threading to the balance can be ensured.

According to a second aspect of the present invention, there is provided the multicolor embroidery sewing machine according to the first aspect, wherein the interior of the thread receiving member guides each color thread to the thread guide path in a state where the thread is separated from each other. I have. This prevents the respective colored yarns from being entangled with each other inside the yarn receiving body, and efficiently supplies the yarn to be used by supplying air to the yarn receiving body as needed at the time of yarn change. Can be.

According to a third aspect of the present invention, there is provided the multicolor embroidery sewing machine according to the first aspect, wherein a thread take-up member is disposed in the vicinity of the thread guide path, and the thread insertion portion of the thread take-up member is connected to the thread when changing the thread. It is configured to be able to be located in a gap provided in the guide path. In this case, one thread take-up member can cope with each color thread, and if a thread break is detected by observing the movement of the thread take-up member, only one thread break detector is required. .

[0012]

Embodiments of the present invention will be described below. First, Embodiment 1 will be described with reference to FIGS.
FIG. 1 is a front view showing a sewing head of a multicolor embroidery sewing machine,
FIG. 2 is a side sectional view showing the sewing machine head. In these drawings, a sewing machine arm 12 is mounted on the front side of the sewing machine frame 10 (FIG. 2). A single needle bar 14 is supported on the sewing machine arm 12 so as to reciprocate up and down together with a sewing needle 16 mounted on the lower end thereof. A balance 18 is located above the needle bar 14, and the balance 18 is positioned with respect to the balance shaft 22 by a position indicated by a solid line (bottom dead center) in FIG. ) Is supported so as to be capable of reciprocating rotation.
In addition, the tip part 20 of the balance 18 is bent rightward in FIG. 1, and a thread hole 21 penetrating vertically is formed in the tip part 20.

A drive shaft 2 is provided inside the sewing machine arm 12.
The drive shaft 24 rotates continuously in one direction in conjunction with a drive motor (not shown) of the sewing machine. The rotation of the drive shaft 24 causes the needle bar 14 to reciprocate up and down through the needle bar drive mechanism 26 and the balance 18 to reciprocate and rotate through the balance drive mechanism 28. The needle bar drive mechanism 26 and the balance drive mechanism 28 are configured to transmit the rotation of the respective cams 27 and 29 fixed on the axis of the drive shaft 24 to the needle bar 14 and the balance 18 by a link member as a reciprocating operation. is there. A presser foot 3 provided at a lower portion of the sewing machine arm 12 is provided.
When the motor 32 (see FIG. 1) mounted on the side of the sewing machine arm 12 rotates, the needle bar reciprocates up and down in synchronization with the vertical drive of the needle bar 14 at a predetermined timing.
However, it is not necessary to use a dedicated motor 32 for driving the presser foot 30.

As shown in FIG.
On the upper surface of the thread stand 34 behind the sewing machine head.
Is provided. The thread stand 34 has a plurality of (six) thread spools 3 each having a differently colored upper thread Y (color thread) wound thereon.
6 are set in a state where the yarn can be fed out. Each upper thread Y fed from these thread spools 36 is
The yarn is guided to an adjustment table 40 located above the sewing machine arm 12 via a yarn path stay 38 erected on the upper surface of the thread stand 34. On the front surface of the adjusting table 40, there are six sets of parts including the first tensioner 42, the thread breakage detector 44 and the second tensioner 46 arranged in order from the upper part to the lower part, the same number as the upper thread Y. Is provided. On the lower side of each second tone adjuster 46, six thread holes (not shown) are formed in the plate.
The thread path 48 is located.

The first tensioner 42 has a structure generally called "champon" in which two plate-shaped plates are brought into contact with each other by a spring force, and the upper thread passing between these plates is used. Light tension is applied to Y. On the other hand, the second tensioner 46 has a structure in which a plate is brought into contact with a backing plate fixed to the front surface of the adjustment table 40 by a spring force. Similarly, a light tension is applied. The types of the tensioners 42 and 46 are not limited to those shown in the drawings, but any type does not lock the movement of the upper thread Y, and provides a proper tension to the upper thread Y. Stay in.

The thread breakage detector 44 is a rotary type detector which rotates when the upper thread Y applied to each thread is fed. Although not shown in the drawing, the same number (six) of thread take-up members as normal "pin pins" are provided on the front surface of the adjusting table 40, respectively. These thread take-up members are formed of a spring material, and the upper thread Y is individually hung on each of them to perform a function of appropriately absorbing slack of the thread that cannot be absorbed by the balance 18 alone.

Inside the adjusting table 40, a thread pulling device 50 for individually pulling each of the upper threads Y by a predetermined length is assembled. This thread picking device 50 includes six thread picking arms 52 corresponding to the number of upper threads Y. Each of these threading arms 52
Is supported so as to be able to reciprocate between an operating position indicated by a solid line in FIG. 2 and a standby position indicated by a virtual line with respect to a shaft 54 bridged between both side walls of the adjusting table 40. Each of the thread pulling arms 52 is normally at a standby position shown by a virtual line under the urging force of a spring (not shown), and only one arm pushed by a lever 62 of an actuator 60 (for example, a rotary solenoid) is a solid line. To the operating position indicated by.

In this embodiment, the movement of one actuator 60 is controlled along the rail 58 provided in parallel with the shaft 54 to the rear position of each threading arm 52. However, in order to eliminate the drive mechanism for this movement control, a dedicated actuator (for example, a linear solenoid) is arranged behind each threading arm 52, and each threading arm 52 is pushed by each plunger. It is of course possible to do so.

The leading end (lower end) of each threading arm 52 is bent forward to form a bent portion 56 having a threading hole. On the other hand, below the yarn path 48 on the adjustment table 40, the bent portions 56 of the respective yarn pulling arms 52 are provided.
A window 40a is formed at a location corresponding to. When the individual threading arms 52 are rotated to the operating positions, the bent portions 56 project from the corresponding windows 40a to the front side of the adjustment table 40. In addition, the upper thread Y is individually passed through the threading holes of each bent portion 56,
As the thread take-up arm 52 rotates to the standby position, the corresponding upper thread Y is moved by a predetermined length as shown by a virtual line in FIG.

On the front side of the sewing machine arm 12, there is provided a hopper type thread receiving body 64 having upper and lower openings. The thread receiving body 64 receives each upper thread Y that has passed through the threading hole of the bent portion 56 in each of the thread pulling arms 52, and guides the upper thread Y to a pipe-shaped first thread guide path 70 connected to a lower portion. Can be. The inside of the thread receiving body 64 is partitioned by a plurality of partition walls 66 for isolating the upper threads Y from each other. That is, the same number of conducting paths 67 as the upper thread Y are formed inside the thread receiving body 64, and the lower portions (outlets) of the respective conducting paths 67 are both connected to the first thread guide path 7.
It communicates with 0. In addition, on the upper part of the front of the
Air blowing ports 6 individually communicating with each of the conducting paths 67
8 are provided.

Below the first yarn guide path 70, a second yarn guide path 74 also having a pipe shape is arranged. These two yarn guide paths 70 and 74 are respectively located on the same longitudinal vertical axis, and are individually provided with air blowing ports 72 and 76 that communicate with each other. And the second
The lower end of the thread guide path 74 is a spout 78 that is open near the sewing needle 16. Also, between the lower end of the first yarn guide path 70 and the upper end of the second yarn guide path 74,
A gap 75 having a predetermined size is provided. When the balance 18 is at the position shown by the solid line in FIGS.
0 is located in a state where the yarn hole 21 is aligned with the yarn guide paths 70 and 74. A ring member such as a ceramic is fixed to each of the lower end of the first yarn guide path 70 and the upper end of the second yarn guide path 74 to prevent wear by the upper thread Y or to smoothly slide the upper thread Y. Have been.

FIG. 3 is an explanatory diagram schematically showing a circuit for supplying air. Air supply device 80 shown in this drawing
Are supplied from the air supply source 82 (such as a compressor) through a supply pipe 84 to the air blowing ports 68, 72,
The air can be individually supplied to 76. Thereby, the yarn receiving body 64 and both yarn guide paths 70, 74
Air is supplied to the inside of the jet port 7 of the second yarn guide path 74.
8 can be fed in a flowing manner. Valves 86, 87, 88 for switching control of supply / stop of air are provided in individual paths leading to the respective air blowing ports 68, 72, 76, respectively.

The valve 86 switches the supply / stop of air to all the passages 67 of the yarn receiving body 64 at the same time, but instead supplies air to each of the passages 67 individually. An individual valve may be provided so as to perform / stop. In this case, one conduction path 6 through which the upper thread Y to be used in the later-described thread change is led.
7 can also be supplied with air.

A threading device 90 for threading the sewing needle 16 is provided on the lower surface of the sewing machine arm 12. As shown in an enlarged perspective view of FIG. 4, the threading device 90 includes a base 92 fixed to the sewing machine arm 12 and a carrier that is driven and controlled to move forward and backward with respect to the base 92. 94 and a threading member 96 that is driven and controlled to move forward and backward with respect to the carrier 94.

The threading device 90 normally has the configuration shown in FIG.
, The threading member 96 is drawn into the carrier 94, and the carrier 94 is drawn into the base 92 like a virtual line. When threading the sewing needle 16, the carrier 94 first protrudes as shown by the solid line, and stops when its tip reaches a position immediately before the sewing needle 16. Subsequently, the threading member 96 projects as shown in FIG. 4B, and penetrates the hole 16a of the sewing needle 16 and is located on the opposite side.

The threading member 96 is formed of a thin elastic material in the shape of a rhombus ring, and can be expanded from a straightly folded state as shown in FIG. 4B. Therefore, the threading member 96 that has completely passed through the hole 16a of the sewing needle 16
Is in a thread receiving state spread out in a large diamond shape. Further, as is apparent from FIG. 4B, the jet port 78 of the second yarn guide path 74 is directed in such a direction that the air blown out therethrough passes through the rhombic ring of the threading member 96 in the thread receiving state. Has become.

Next, the thread change of the upper thread Y will be described. FIG. 5 shows one upper thread Y selected in the previous thread change.
FIG. 3 is a side cross-sectional view showing a state in which sewing is performed according to FIG. 2. In this drawing, the balance 18 is shown at the top dead center of the reciprocating rotation. In the thread picking device 50, one thread picking arm 52 through which the upper thread Y is being sewn is pushed by the lever 62 of the actuator 60 and is held at the operating position indicated by the solid line. Then, when the sewing with the upper thread Y at this time is completed and the thread is cut under the sewing machine table (not shown), the sewing machine stops with the balance 18 almost at the top dead center.

Thereafter, the actuator 60 of the thread picking device 50 is driven and controlled, and the lever 62 operates in the state shown by the imaginary line, whereby the pushing force on the thread picking arm 52 is released. As a result, the thread pulling arm 52 rotates to the standby position indicated by the imaginary line by the urging force of the spring. As a result, the upper thread Y which has already been thread-cut under the sewing machine table is pulled up, and its thread end is moved to the position shown in FIG. 5 (or FIG. 2).
, That is, the upper position of the yarn receiving body 64.

Next, the balance 18 rotates to the bottom dead center,
The distal end portion 20 is located in a state where the thread hole 21 and the thread guide paths 70 and 74 are aligned with the gap 75, and the threading member 96 of the threading device 90 is shown in FIG.
The thread receiving state indicated by. Then, the thread picking arm 52 through which the upper thread Y to be used next passes is pushed by the lever 62 of the actuator 60 and starts rotating toward the operating position indicated by the solid line in FIG. 5 (or FIG. 2). In parallel with this, air is supplied to the yarn receiving body 64 and both yarn guide paths 70 and 74 by the air supply device 80. As a result, only the upper thread Y passing through the thread pulling arm 52 that has started to rotate as described above is blown downward from the thread receiving body 64 through the two thread guide paths 70 and 74 by the flow of air. Swept away.

As a result, the upper thread Y is separated from the gap 7
The thread is passed through the thread hole 21 of the balance 18 located at 5 and is blown out from the ejection port 78 of the second thread guide path 74 to pass through the rhombus ring of the threading member 96 in the thread receiving state. . Here, the threading member 96 and the carrier 94 are respectively drawn in as indicated by phantom lines in FIG. 4A, and the upper thread Y is passed through the hole 16a of the sewing needle 16. This completes a series of operations for thread change, and sewing with the newly threaded upper thread Y can be started.

The five unused upper yarns Y are pulled up by the respective yarn pulling arms 52 at the standby positions. Then, as described above, each of the conductive paths 6 of the thread receiving body 64 is
Even if the air is supplied to all the members 7 at a time, these five upper threads Y are not sent out. The reason is that, in addition to the resistance to the yarns by the tensioners 42 and 46 of the adjusting table 40 and the yarn take-up member, the resistance of the five upper yarns Y due to being pulled by the individual yarn pulling arms 52 is also present. Because they have joined. Therefore, as shown in FIG. 6, one air blowing port 68 of the yarn receiving body 64 has one pipe 100
May be configured to communicate with each other.

The thread picking arm 52 in the standby position
By pushing the upper end of the arm backward against the urging force of the spring, the thread pulling arm 52 can be manually turned to the operating position. Thus, the thread hole of the bent portion 56 of the arbitrary threading arm 52 can be aligned with the thread hole of the thread path 48, and the threading process can be performed when the upper thread Y breaks.

Next, a second embodiment will be described with reference to FIGS. 7 is a front view of the sewing head, and FIG. 8 is a side sectional view of the sewing head. In the second embodiment, the second yarn guide path 74 is vertically separated, and the separated guide paths 74A and 74B are individually connected to the air blowing port 7.
6A, 76B and guide paths 74A, 74B.
A gap 98 is provided therebetween. Sewing machine arm 1
A thread detector 110 is attached to 2 adjacent to the gap 98.

FIG. 9 is a perspective view showing the structure of the yarn detector 110. A base 112 of the thread detector 110 is fixed to the front surface of the sewing machine arm 12, and a shaft 114 perpendicular to the base 112 is rotatably supported. An arm 118 having a ring 116 at its tip and a circular slit plate 120 are attached to the shaft 114, respectively. The shaft 114 is urged by a torsion spring or the like in the rotation direction shown by the arrow in FIG. 9, and the rotation position is regulated by the arm 118 abutting against the stopper 122 of the base 112. A photo interrupter 124 for sensing the slit plate 120 and a solenoid 126 for rotating the arm 118 in the direction opposite to the arrow against the spring force are attached to the base 112.

At the time of the thread change described above, the arm 118 is operated by the solenoid 126 of the thread detector 110.
Is rotated to the position indicated by the imaginary line in FIG.
6 is positioned with respect to the gap 98 in a state of being aligned with the guide paths 74A and 74B. By the subsequent threading, the upper thread Y to be used is passed through the ring 116. By turning off the solenoid 126 during sewing, the needle bar 14 is driven one reciprocating motion by the relationship between the change in the tension acting on the upper thread Y and the torsion spring acting on the shaft 114. The arm 118 rotates one reciprocation at a predetermined timing. By detecting the timing and amount of this rotation by the slit plate 120 and the photo interrupter 124, it is possible to detect not only the upper yarn Y but also the lower yarn breakage.

The arm 11 having the ring 116
8 and the torsion spring acting on the shaft 114 fulfill the function of the thread take-up member already described, that is, the function of appropriately absorbing the slack of the thread that cannot be absorbed by the balance 18 alone. Therefore, in the second embodiment, one thread detector 110 is provided instead of the same number of thread break detectors 44 provided on the adjustment table 40 and the thread take-up members usually called “pin pins”. It is possible to respond with. As shown in FIG. 10, a thread detector 110 is provided adjacent to the gap 75, and the ring 116 and the balance 1
The gap 75 can be used instead of the gap 98 in consideration of preventing mutual interference with the tip portion 20 of the head 8.

Next, a third embodiment will be described with reference to FIG. The support 130 shown in FIG.
Slide control in the left-right direction is possible on the front surface of the second member 2, and, for example, three needle bars 14 are supported on the support 130 so as to be able to reciprocate up and down. This support 13
By performing the slide control on 0, one of the needle bars 14 can be selected and driven up and down. These needle bars 1
The sewing needles 16 attached to the lower end of the needle 4 differ in, for example, the thickness, the tip shape, the size of the hole 16a, and the like, and are selectively used according to the thickness and properties of the upper thread Y. I do. However, unlike the multi-needle type sewing machine, which has the same number of needle bars as the upper thread Y on the slidable support, the above function of selectively re-threading the upper thread Y at the time of thread replacement is also used. The width of the sewing head, and thus the width of the entire sewing machine, is prevented from becoming extremely large.

Next, a fourth embodiment will be described with reference to FIG. The fourth embodiment is a technique in the case where the maximum number of color changes of multicolor embroidery is set to 12 by increasing the number of upper threads Y from six in the above-described embodiments to, for example, twelve. Needle thread Y
In order to increase the number, the number of component sets of the adjusting table 40 and the conductive paths 67 in the thread receiving body 64 are adjusted accordingly.
You only need to increase the number of. However, if the number of the conductive paths 67 of the yarn receiving body 64 in the above-described embodiment is increased too much, the shape of each conductive path 67 may become excessive and the flow of the upper thread Y may be deteriorated.

Therefore, in Embodiment 4, FIG.
As shown by 2, the adjustment table 140 is provided with a number of component sets (toners 42, 46, the thread breakage detector 44, etc.) corresponding to the number (12) of the upper thread Y, and the adjustment table 14
0 is slidable with respect to the sewing machine arm 12 in the left-right direction. In addition, 6
Two thread receiving bodies 142 each having two conducting paths 143 are provided side by side. These thread receiving bodies 142 slide together with the adjusting stand 140 to bring the respective first thread guide paths 144 into a state of being selectively aligned with one second thread guide path 146 fixed to the sewing machine arm 12. be able to.

In the fourth embodiment, by setting the distance between the two first yarn guide paths 144 small as shown in FIG. 12, the slide amount can be suppressed to a small value. In the fourth embodiment, of course, the number of the upper thread Y also corresponds to the thread hole of the thread path 48 or the thread picking arm 52 of the thread picking device 50.

Next, a fifth embodiment will be described with reference to FIG. In the fifth embodiment, for example, a roller 148 instead of a ring member such as a ceramic is rotatably provided at each of the lower end of the first yarn guide path 70 and the upper end of the second yarn guide path 74 in the first embodiment. Supported. In addition, the roller 149 is also provided on the inner circumference of the thread hole 21 of the balance 18.
Are rotatably supported. Thereby, the sliding resistance of the upper thread Y accompanying the operation of the balance 18 is further reduced, and smooth sliding of the upper thread Y is obtained. FIG. 1 showing the sixth embodiment.
As shown in FIG. 4, by forming the tip 152 of the balance 150 from both sides thereof, the strength is increased more than that of the balance 18 having the cantilever shape as in the balance 18 in each of the above embodiments. be able to.

Finally, a seventh embodiment will be described with reference to FIG. In the seventh embodiment, the bending portion 56 of each threading arm 52 in the threading device 50 has a bifurcated shape that is divided into upper and lower portions, and the fixing bar 160 is provided in the window 40a of the adjustment table 40 into which the bending portion 56 enters. It is fixed.
Then, when the thread take-up arm 52 is rotated from the above-described operation position shown in FIG. 15A to the standby position shown in FIG. 15B, the upper thread Y is pulled up in a state of being folded fourfold. Therefore, the upper thread Y can be sufficiently pulled by a small rotation stroke of the thread pulling arm 52.

Although the preferred embodiment of the present invention has been described with reference to the drawings, this embodiment can be easily modified or modified without departing from the spirit of the present invention. For example, instead of a structure in which the inside of the yarn receiving body 64 (142) is partitioned into a plurality of conductive paths 67 (143) by a partition wall 66, the yarn receiving body is constituted by a set of a plurality of tubes serving as individual conductive paths. Is also possible. In the hopper type yarn receiving body 64 (142), the partition 66 may be omitted and the inside may be a single passage. In addition, it is of course possible to extend the lower part of the yarn receiving body 64 (142) to integrally form the first yarn guide path 70 (144). Further, in the yarn picking device 50, each yarn picking arm 52 is configured to reciprocate between its standby position and the operating position, but may be moved linearly.

As described above, in each of the embodiments of the present invention, since the yarn guide path is substantially straight, the upper yarn (color yarn) can be reliably passed by effectively utilizing the flow of air. it can. In particular, in threading through the balance, it is not necessary to partially bend the thread guide path, and the thread hole of the balance may be in a closed loop shape. Unlike threading the shaped part, the thread passed through will not come off the balance during sewing.

[Brief description of the drawings]

FIG. 1 is a front view showing a sewing head of a multicolor embroidery sewing machine.

FIG. 2 is a side sectional view showing the sewing machine head.

FIG. 3 is an explanatory diagram schematically showing a circuit for supplying air.

FIG. 4 is a perspective view showing a threading device.

FIG. 5 is a side sectional view showing a sewing head in a state where sewing is performed.

FIG. 6 is a front view of the sewing head showing an example of changing the air blowing port in the thread receiving body.

FIG. 7 is a front view of a sewing head according to the second embodiment.

FIG. 8 is a side sectional view of a sewing head according to the second embodiment.

FIG. 9 is a perspective view illustrating a structure of a yarn detector according to a second embodiment.

FIG. 10 is a front view of a sewing head showing a modification of the second embodiment.

FIG. 11 is a configuration diagram illustrating a third embodiment.

FIG. 12 is a front view of a sewing head according to a fourth embodiment.

FIG. 13 is a configuration diagram illustrating a fifth embodiment.

FIG. 14 is a configuration diagram illustrating a sixth embodiment.

FIG. 15 is a configuration diagram illustrating a seventh embodiment.

[Explanation of symbols]

 Reference Signs List 16 sewing needle 18 balance 21 thread hole 50 thread pick-up device 64 thread receiving member 70, 74 thread guide path 75 gap 78 spout 80 air supply device 90 threading device Y needle thread (color thread)

Claims (3)

[Claims] 1. A multi-color embroidery using various kinds of color yarns is possible, and at the time of changing yarns for selectively using these color yarns, the color yarns are automatically passed using an air flow. A multi-color embroidery sewing machine having a function, comprising: a thread take-up device capable of individually and selectively moving each of the color yarns by a predetermined length; and each color thread passing through the thread take-up device. A thread receiving body for receiving and guiding the thread downward, a thread guide path in a vertical direction for guiding a color thread fed from the thread receiving body to an ejection port opened near the sewing needle of the sewing machine, and a An air supply device capable of supplying air flowing through the balance, a balance capable of positioning a yarn hole in a state of being aligned with the yarn guide path with respect to a gap provided in the yarn guide path, and a balance of the yarn guide path. In front of the color yarn blown out by air from the spout Multicolor embroidery sewing machine be passed through a hole of the sewing needle and a threading device possible. 2. The multicolor embroidery sewing machine according to claim 1, wherein the interior of the thread receiver guides each color thread to the thread guide path in a state where the threads are separated from each other. 3. The multi-color embroidery sewing machine according to claim 1, wherein a thread take-up member is arranged near the thread guide path, and a thread insertion portion of the thread take-up member is provided in the thread guide path when changing a thread. A multicolor embroidery sewing machine that can be positioned at