JPH055264A - Multishaft sewing machine - Google Patents

Abstract

PURPOSE:To prevent entanglement of mutual yarns and color mixture in the case of using yarn of the following color by separating yarn of one color from cloth when sewing of the yarn of one color is completed and to carry out sewing in a state of yarn end not projecting from the surface of the cloth when the next sewing is done in the case of resewing. CONSTITUTION:An arm is horizontally movably equipped with a holding plate vertically movably supporting plural needle shafts in such a way that the needle shafts are changeably arranged right above on a needle drop position. First holding mechanisms to grip needle thread are laid at positions corresponding to the plural needle shafts in the holding plate, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axis sewing machine capable of embroidery sewing or decoration sewing using a plurality of types of threads.
More specifically, the present invention relates to a multi-axis sewing machine in which a large number of needle bars are provided and the needle bars are selectively operated to perform the sewing.

[0002]

2. Description of the Related Art A conventional multi-axis sewing machine, for example, a sewing machine shown in Japanese Patent Publication No. 57-53751 has a bed and an arm arranged above the bed, and the arm has a plurality of needle bars. The holding plate that supports the needle up and down is mounted so that it can move laterally so that the needle bar can be interchangeably positioned with respect to the position directly above the needle drop. The needle is provided with a hook, and the needle is provided for the needle on the needle bar side by operating the hook in response to the vertical movement of one needle bar in the position directly above the needle drop among the needle bars Embroidery is performed with the bobbin thread to be used.

[0003]

In this conventional multi-axis sewing machine, when sewing with one color thread is completed and then the needle bar is moved laterally to perform sewing with the next color thread, Thread of the sewing machine hangs from the needle for sewing on the cloth, when sewing with the thread of the next color, the sewing is performed with the previous thread stepped on, and the mutual thread There is a problem in that the yarn is entangled or both patterns are mixed on the upper surface of the cloth and the pattern becomes unclear.

In order to solve this, it has been attempted to separate the thread hanging from the needle upward from the cloth after the sewing with the previous thread is completed. However, when doing so, when sewing with another thread is finished and the above thread is sewn again,
There is a problem that the end of the thread remains exposed on the upper surface of the cloth and the appearance of the surface of the cloth deteriorates.

In order to solve this problem, it is conceivable to cut the thread hanging from the needle into short pieces in advance, but then, when a plurality of needle bars are exchangeably moved laterally, or when the needle bars are stopped. If the balance moves inside, the thread will be pulled out from the needle hole of the needle, which is a problem that cannot be implemented. The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art. When the sewing of a thread of one color is finished, the thread of the next color is separated by pulling the thread upward from the cloth. When sewing using threads, it is possible to prevent entanglement and color mixing between threads, and even if it is done so, when sewing again with the above threads, the ends of the threads It is an object of the present invention to provide a multi-axis sewing machine capable of performing sewing while being prevented from popping out on the surface of cloth.

[0006]

In order to achieve the above object, a multi-axis sewing machine according to the present invention comprises a bed and an arm disposed above the bed, and the arm has a plurality of needle bars. The holding plate that supports the needle up and down is mounted so that it can move laterally so that the needle bar can be interchangeably positioned with respect to the position directly above the needle drop. The needle is provided with a hook, and the needle is provided for the needle on the needle bar side by operating the hook in response to the vertical movement of one needle bar in the position directly above the needle drop among the needle bars In a multi-axis sewing machine configured to perform embroidery with a lower thread, a first holding mechanism for holding the upper thread is provided at a position corresponding to the plurality of needle bars on the holding plate. is there.

[0007]

[Operation] When the first holding mechanism operates, the thread 21 is gripped,
To release. When the second holding mechanism is operated, the suspended thread is pulled up.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present application will be described below with reference to FIGS. Reference numerals 1 to 20 are well-known multi-axis sewing machines (for example, Japanese Patent Publication No. 57-53751 or JP-A-47-22255).
(The same as those shown in the publication), 1 is a bed, 2 is a needle plate having a needle drop hole, 3 is a shaft for driving a hook, and 4 is below the needle drop hole. , 5 is a well-known needle thread cutting device provided below the needle plate 2, 7 is an arm arranged above the bed 1, 8 is a drive shaft, and 9 is a vertical movement with respect to the arm 7. Freely operating rod, 10 is a crank mechanism, 11 is a needle bar retainer, 12 is a holding body attached to the arm 7 so as to be able to move laterally, 13 is a needle bar that is vertically movable with respect to the holding body 12,
Reference numeral 14 is a needle, 15 is a pressing body that can be moved up and down with respect to the needle bar 13, 16 is a cloth pressing portion, 17 is a first spring, 18 is a second spring stronger than the first spring 17, and 20 is a balance. .. Numeral 21 is a well-known needle thread having different colors for a plurality of needles 14, 14 ...

In the multi-axis sewing machine having the above structure, the shafts 3 and 8 are rotated in synchronization with each other when a driving device (main motor) (not shown) is operated. When the shaft 3 rotates, the shuttle 4 rotates, and when the shaft 8 rotates, the operating rod 9 moves up and down and the balance 20 moves up and down (while the shuttle 4 rotates twice, the operating rod 9 and the balance 20 move). Is 1
Move up and down). Further, the holder 12 is laterally moved by a driving device different from the above, and one of the many needle bars 13 is selectively positioned below the needle bar retainer 11. As a result, the needle bar 13 is moved up and down by the needle bar retainer 11 which moves up and down together with the actuating bar 9, and the needle 14 attached to the needle bar 13 performs sewing as is well known.

Next, reference numerals 23 and 24 respectively indicate a first holding mechanism and a second holding mechanism provided in the above-mentioned multi-axis sewing machine. First, the first holding mechanism 23 will be described in detail with reference to FIGS. 3 and 4. The first holding mechanism 23 comprises a thread pressing mechanism 25 and a releasing mechanism 26. In the holding mechanism 25, 27 is a base body attached to the holding body 12, 28 is a thread hole, 29 is a receiving piece, and 30 is an advancing and retracting rod which is movable forward and backward with respect to the basic body 27 in the arrow direction. 31 is a retainer piece and a set screw
It is attached to the advancing and retracting rod 30 using 32 so that the position can be changed. 33
The spring urges the pressing piece 31 toward the receiving piece 29. Above code
The members indicated by 28 to 33 are provided respectively corresponding to the plurality of needle bars 13. Next, in the release mechanism 26, 35 is a base frame fixed to the arm 7, 36 is a solenoid, and 37 is its plunger. 38 is a release piece, which is pivotally attached to the base frame 35. Reference numerals 39 and 40 respectively denote a lever and a link for connection.

In the first holding mechanism 23 having the above construction, the upper thread 21 from the balance 20 is threaded through the thread hole 28, the receiving piece 29 and the pressing piece 31.
In the meantime, it is passed through the side of the advancing and retracting rod 30 and into the hole of the needle 14. In that state, the pressing piece is pressed by the urging force of the spring 33.
The upper thread 21 is sandwiched between 31 and the receiving piece 29, and the vertical movement of the upper thread 21 is prevented. On the other hand, when the plunger 37 is pulled in by the operation of the solenoid 36, the release piece 38 is swung in the arrow direction via the lever 39 and the link 40. As a result, in the thread pressing mechanism 25 corresponding to the needle bar 13 at the position operated by the needle bar pressing member 11, the advancing / retreating rod 30 is pushed by the releasing piece 38 and the pressing piece 31 is separated from the receiving piece 29. As a result, the upper thread 21 is ready to move through the thread hole 28. Meanwhile the plunger
When 37 protrudes to the state shown in FIG. 3, lever 39,
The release piece 38 is swung in a direction away from the advancing / retracting rod 30 via the link 40, and the needle thread 21 is again pinched between the receiving piece 29 and the pressing piece 31 and is prevented from moving up and down. ..

Next, the second holding mechanism 24 will be described with reference to FIGS.
Will be described in detail with reference to. A holding frame 43 is attached to the base frame 35 via legs 44. Reference numeral 45 is a slit formed in the holding frame 43, and thread stoppers 46 are attached to the upper and lower surfaces thereof. As the thread stopper 46, a fluffy material such as felt or a sandpaper-shaped material is used in which the thread is easily held. 47 is the base frame 35
The guide member 48, which is attached to, is a reciprocating piece that can be moved back and forth along the guide member 47. 49 is a thread hooking piece attached to the advancing / retreating piece 48, and a hooking section 50 is provided at the tip thereof.
Reference numeral 51 is a rotary solenoid attached to the base frame 35, 52 is an operating piece thereof, and a cutting groove-shaped engaging portion 53 is formed at the tip end thereof, and an engaging piece 54 fixed to the advancing / retracting piece 48 is positioned there. is doing.

In the second holding mechanism 24 having such a structure, the operating piece 52 of the rotary solenoid 51 reciprocates in the direction of the arrow when the operating rod 9 and the needle bar 13 are in the raised position.
As a result, the thread hooking piece 49 projects through the slit 45 to the position shown in FIG. 2, and then returns to the position shown by the solid line in FIG. By this movement, the hooking portion 50 draws the upper thread 21 hanging from the needle 14 into the slit 45 as shown in FIG. The drawn upper thread 21 is held in that state by the thread stopper 46.

Next, in the case of performing sewing with the multi-axis sewing machine having the above-mentioned structure, the operation at the end of sewing with a thread of one color and the initial operation when the thread is sewn again will be described with reference to FIGS. 7 and 8. (A) to (E) of FIG. 9, (F) to (J) of FIG.
Will be described in detail. 8A to 8E and FIG.
(F) to (J) of FIG. 7 show the relationships among the balance 20, the needle 14, the cloth 55, and the shuttle 4 at the time points indicated by (A) to (J) in FIG. 7, respectively. At the end of sewing, the main motor is first decelerated.
Then, in the decelerated state, the balance 20 and the needle bar 13 move up and down as shown in the drawing. In this process, first, at the time point indicated by (a), the sword tip 4a of the shuttle 4 is the upper thread 21.
To the point indicated by (A). At this time, as shown in FIG. 8 (A), the upper thread cutting device 5 operates to pass the upper thread 21 (the needle 14 hole, the cloth 55, the needle drop hole of the needle plate 2 and further the hook 4
After turning, cut the part that is continuous with the cloth 55). In this case, the upper thread 21 is located below the threading hole in the needle 14
14 cm remains. Next, the balance 20 and needle bar 13 rose slightly.
At the time of (B) (the point at which the balance 20 rises from the horizontal position becomes 340 ° when 0 ° is taken), the first holding mechanism 23
Is held. At this time, about 90 mm of upper thread 21 remains below the threading hole (from the point of (A) above).
(Because the balance 20 has moved up about 25 mm by the time of (B)). After that, the balance 20 moves to the horizontal position, and the operation of the main motor stops with the needle bar 13 moving to the top dead center. After that, the solenoid 51 of the second holding mechanism 24 is operated, and the end portion of the upper thread 21 is pulled out from the cloth 55 and drawn into the holding frame 43 as shown in FIG. 8C.

In the above-mentioned state, the holding body 12 is rotated as is well known, and sewing using threads of other colors is performed as well known. In this case, the needle thread 21 used for the previous sewing as described above
Is held by the second holding mechanism 24, the thread 21
Is prevented from being entangled with the next color thread.

Next, when the sewing with the thread is started again after the sewing with the thread of the different color is finished, the main motor is driven at a low speed while the upper thread 21 is held by the holding mechanism 23. To start operation. As a result, the balance 20 and the needle bar 13 move up and down, respectively, as shown in the figure. In this case, the balance 20 is moved upward from the start of the main motor until the time point indicated by (D), and the upper thread 21 is paid out from the bobbin (not shown). next
At the time of (E), as shown in (E) of FIG. 8, the sword tip 4a of the hook 4 is caught by the loop of the needle thread 21 formed under the cloth 55 by the needle 14, and then at the time of (F). When the hook 4 is rotated, the upper thread 21 caught on the sword tip 4a is pulled under the cloth. Next, after the time point indicated by (G) and the time point indicated by (H), the holding mechanism 23 is released. These (F)
In the process of (H), the upper thread of about 80 mm appears under the cloth 55.
After that, at a time point indicated by (I), as shown in (I) of FIG. Is triggered. (At this time, the upper thread protruding under the cloth 55 is about 60 to 70 mm.) After that, the upper thread 21 caught on the sword tip 4a is drawn below the cloth 55 by the rotation of the hook 4. A well-known entanglement between the upper thread and the lower thread is achieved. Also at this time the balance 2
0, the needle 14 moves upward, and the needle thread 21 is pulled out from the cloth 55 by a short dimension. It becomes the length. Thereafter, after the time point (J) (state (J) in FIG. 9), sewing is performed as is well known.

In the case of the above operation, the entanglement of the upper thread and the lower thread is not generally achieved in the steps (E) to (G), but depending on the kind of the cloth 55 and the upper thread 21 used, In some cases, the tip of the yarn 21 remains in the cloth 55 and the entanglement between the upper yarn 21 and the lower yarn is achieved.

Although only one color thread has been described above, the same operation is performed when sewing with threads of other colors.

[0019]

As described above, according to the present invention, since the first holding mechanism for holding the upper thread is provided, the above-mentioned conventional drawbacks can be solved.

[Brief description of drawings]

FIG. 1 is a front view of a multi-axis sewing machine.

FIG. 2 is a vertical sectional view.

FIG. 3 is a bottom view showing the first holding mechanism.

FIG. 4 is an enlarged sectional view taken along line IV-IV.

FIG. 5 is a bottom view showing the second holding mechanism.

FIG. 6 is a front view showing a developed state of a holding frame.

FIG. 7 is a time chart showing operation timing.

FIG. 8 is an operation explanatory view showing a state at a time point shown by (A) to (E) of FIG.

FIG. 9 is an operation explanatory view showing a state at a time point indicated by (F) to (J) in FIG. 7.

[Explanation of symbols]

 1 bed 4 shuttle 7 arm 13 needle bar 14 needle 23 1st holding mechanism 24 2nd holding mechanism

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[Procedure amendment]

[Submission date] March 18, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Multi-axis sewing machine

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axis sewing machine capable of embroidery sewing or decoration sewing using a plurality of types of threads.
More specifically, the present invention relates to a multi-axis sewing machine in which a large number of needle bars are provided and the needle bars are selectively operated to perform the sewing.

[0002]

2. Description of the Related Art A conventional multi-axis sewing machine, for example, Japanese Patent Publication No. 57-
The sewing machine disclosed in Japanese Patent No. 53751 includes a bed and an arm arranged above the bed, and a holding plate that supports a plurality of needle bars so as to be vertically movable is provided on the arm. The needle bar is mounted so that it can be moved laterally so that it can be exchanged with respect to its position. On the other hand, in the bed part, a hook is provided below the needle drop position, and the needle drop directly above the needle drop of the plurality of needle bars is provided. By operating the shuttle in response to the vertical movement of one needle bar at the position, embroidery is performed with the upper thread provided for the needle on the needle bar side and the lower thread provided for the shuttle.

[0003]

In this conventional multi-axis sewing machine, when sewing with one color thread is completed and then the needle bar is moved laterally to perform sewing with the next color thread, When the thread for sewing hangs over the cloth for a long time from the needle for sewing, when sewing with the thread of the next color, the sewing is performed with the previous thread stepped on, and the There is a problem that the threads are entangled or both the threads are mixed on the upper surface of the cloth and the pattern becomes unclear.

In order to solve this problem, it has been attempted to pull the long thread upward from the cloth before hanging from the needle after the sewing with the previous thread is completed. However, in such a case, when sewing with another thread is finished and the above thread is sewn again, the long end of the thread remains on the upper surface of the cloth and the appearance of the cloth surface is bad. There was a problem.

In order to solve this problem, it is conceivable to cut the thread hanging from the needle into short pieces in advance, but then, when a plurality of needle bars are exchangeably moved laterally, or when the needle bars are stopped. When the balance moves inside, the thread is pulled out upward from the needle hole of the needle, which causes a problem that the next sewing cannot be performed. The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art. When the sewing of one color thread is completed, the thread can be shortened to such an extent that it can be pulled upward from the cloth. Therefore, it is possible to prevent entanglement and color mixing between threads when sewing with the thread of the next color, and even if the thread is shortened in such a way, the needle hole does not move during lateral movement of the needle bar. It is an object of the present invention to provide a multi-axis sewing machine in which the thread end does not come out from the thread.

[0006]

In order to achieve the above object, a multi-axis sewing machine according to the present invention comprises a bed and an arm disposed above the bed, and the arm has a plurality of needle bars. A holding plate that supports up and down movement of the bed so that one of the needle bars can be exchangeably positioned with respect to the position directly above the needle drop point of the bed. In this case, a hook is provided below the needle drop position, and the needle on the needle bar side is prepared by operating the hook in response to the vertical movement of one needle bar in the position immediately above the needle drop of the above-mentioned plurality of needle bars. In a multi-axis sewing machine configured to perform embroidery with an upper thread to be provided and a lower thread to be provided in a shuttle, the upper thread is always grasped at a position near each of the plurality of needle bars on the holding plate. A needle thread holding mechanism is attached to the arm, and Bunch of thread holding mechanism on which is attached to incoming needle bars those which gave comprising a release mechanism for releasing only state.

[0007]

When the needle thread holding mechanism is operated, the thread 21 is gripped.
When the release mechanism operates, the grip of the corresponding upper thread holding mechanism is released.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present application will be described below with reference to FIGS. Reference numerals 1 to 20 are well-known multi-axis sewing machines (for example, Japanese Patent Publication No. 57-53751 or JP-A No. 47-2225).
No. 5, which is the same as that shown in the publication No. 5, 1 is a bed, 2 is a needle plate having needle drop holes, 3
Is a shaft for driving the shuttle, 4 is a shuttle located below the needle drop hole, 5 is a known needle thread cutting device provided below the needle plate 2, and 7 is an arm arranged above the bed 1. , 8 is a drive shaft, 9 is an operating rod that is vertically movable with respect to the arm 7, 10 is a crank mechanism,
Reference numeral 11 is a needle bar retainer, 12 is a holder attached to the arm 7 so as to be able to move laterally, 13 is a needle bar that is vertically movable with respect to the holder 12, 14 is a needle, and 15 is a needle bar 13 which is vertically movable. A movable pressing body, 16 is a cloth pressing portion, 17 is a first spring, 1
Reference numeral 8 indicates a second spring that is stronger than the first spring 17, and 20 indicates a balance. Reference numeral 21 is a well-known needle thread and a plurality of needles 14, 14, ...
In contrast, different colors are used.

In the multi-axis sewing machine having the above structure, the shafts 3 and 8 are rotated in synchronization with each other when a driving device (main motor) (not shown) is operated. The rotation of the shaft 3 rotates the shuttle 4, the rotation of the shaft 8 causes the operating rod 9 to move up and down and the balance 20 to move up and down (while the shuttle 4 rotates twice, the operating rod 9 and the balance 20 move).
Moves up and down once). Further, the holding body 12 is laterally moved by a driving device different from the above, and one of the many needle bars 13 is selectively positioned below the needle bar retainer 11. As a result, the needle bar 13 is moved up and down by the needle bar retainer 11 that moves up and down together with the actuating bar 9, and the needle 14 attached to the needle bar 13 performs sewing as is well known.

Next, reference numerals 23 and 24 respectively show an upper thread holding mechanism and a thread end holding mechanism provided in the above-mentioned multi-axis sewing machine. First, the needle thread holding mechanism 23 will be described in detail with reference to FIGS. 3 and 4. The upper thread holding mechanism 23 includes a thread pressing mechanism 25 and a releasing mechanism 26. In the pressing mechanism 25, 27 is a base body attached to the holding body 12, 28 is a thread hole, 29 is a receiving piece, and 30 is an advancing and retracting rod which is movable forward and backward with respect to the basic body 27 in the arrow direction. A pressing piece 31 is attached to the advancing / retreating rod 30 by using a set screw 32 so as to be repositionable. 33 is a spring and is a pressing piece 31
Is urged toward the receiving piece 29. The members indicated by the reference numerals 28 to 33 are provided respectively corresponding to the plurality of needle bars 13. Next, in the release mechanism 26, 35 is a base frame fixed to the arm 7, 36 is a solenoid, and 37 is a plunger thereof. A release piece 38 is pivotally attached to the base frame 35. Reference numerals 39 and 40 respectively represent a connecting lever and a link.

In the needle thread holding mechanism 23 having the above-described structure, the needle thread 21 from the balance 20 is threaded through the thread hole 28 and the receiving piece 29.
And the pressing piece 31 and the side of the advancing / retreating rod 30 and the needle 14
Is passed through the hole. In this state, the upper thread 21 is sandwiched between the pressing piece 31 and the receiving piece 29 by the urging force of the spring 33, and the vertical movement of the upper thread 21 is prevented. On the other hand, when the plunger 37 is pulled in by the operation of the solenoid 36, the release piece 38 is swung in the arrow direction via the lever 39 and the link 40. As a result, in the thread pressing mechanism 25 corresponding to the needle bar 13 at the position operated by the needle bar pressing member 11, the advancing / retreating rod 30 is pressed by the releasing piece 38 and the pressing piece 31 is separated from the receiving piece 29. As a result, the upper thread 21 is ready to move through the thread hole 28. On the other hand, when the plunger 37 projects to the state shown in FIG. 3, the release piece 38 is swung in the direction away from the advancing / retreating rod 30 via the lever 39 and the link 40, and the needle thread 21 again receives the receiving piece 29 and the pressing piece. It is sandwiched between 31 and 31 and is prevented from moving up and down.

Next, the yarn end holding mechanism 24 will be described in detail with reference to FIGS. 5 and 6. 43 is a holding frame, and a leg 44
It is attached to the base frame 35 via. 45 is a holding frame 4
The slits 3 are formed with thread stoppers 46 on the upper and lower surfaces thereof. As the thread stopper 46, a fluffy material such as felt or a sandpaper-shaped material is used in which the thread is easily retained. Reference numeral 47 is a guide member attached to the base frame 35, and reference numeral 48 is an advancing / retreating piece that can be moved back and forth along the guide member 47. 49 is a thread hooking piece attached to the advancing / retreating piece 48, and a hooking portion 50 is provided at the tip end thereof. Reference numeral 51 is a rotary solenoid attached to the base frame 35, 52 is an operating piece thereof, and a cutting groove-shaped engaging portion 53 is formed at the tip end thereof, and an engaging piece 54 fixed to the advancing / retreating piece 48 is positioned there. is doing.

In the yarn end holding mechanism 24 having such a structure, the operating piece 52 of the rotary solenoid 51 reciprocates in the direction of the arrow when the operating rod 9 and the needle bar 13 are in the raised position. As a result, the thread hooking piece 49 projects through the slit 45 to the position shown in FIG. 2, and then returns to the position shown by the solid line in FIG. By this movement, the hook portion 50 draws the upper thread 21 hanging from the needle 14 into the slit 45 as shown in FIG. The drawn upper thread 21 is held in that state by the thread stopper 46.

Next, in the case of sewing with the multi-axis sewing machine having the above-mentioned structure, the operation at the end of sewing with a thread of one color and the initial operation when the thread is sewn again are shown in FIGS. 7 and 8. (A) to (E) of FIG. 9 and (F) to (J) of FIG. 8 (A) to (E) and FIG. 9 (F) to (J) are the balance 20, the needle 14, and the needle 14 at the time points indicated by (A) to (J) in FIG.
The relationship between the cloth 55 and the shuttle 4 is shown respectively. At the end of sewing, the main motor is first decelerated. Then, in the decelerated state, the balance 20 and the needle bar 13 move up and down as shown in the drawing. In this process, first, at the time point indicated by (a), the blade tip 4a of the shuttle 4 hooks the upper thread 21 to the time point indicated by (A). Figure 8 at this point
(A), the upper thread cutting device 5 is actuated to move the upper thread 21 (through the hole of the needle 14, the cloth 55, the needle drop hole of the needle plate 2 and further around the shuttle 4 to be connected to the cloth 55. Section). In this case, the upper thread 21 remains about 14 cm below the threading hole in the needle 14. Next, when the balance 20 and the needle bar 13 are slightly elevated (B) (the point at which the balance 20 rises from the horizontal position is 340 ° when the point is 0 °).
In, the upper thread holding mechanism 23 is brought into the holding state. At this time, the upper thread 21 of about 90 mm remains below the threading hole (because the balance 20 moves up by about 25 mm between the time point (A) and the time point (B)). Then balance 20
Moves to the horizontal position, and the operation of the main motor stops when the needle bar 13 moves to the top dead center. After that, the thread end holding mechanism 24
When the solenoid 51 is operated, the end portion of the needle thread 21 is pulled out from the cloth 55 and drawn into the holding frame 43 as shown in FIG. 8C.

In the above state, the holding body 12 is rotated as is well known, and sewing using threads of other colors is performed as well known. In this case, since the needle thread 21 used for the previous sewing is held by the thread end holding mechanism 24 as described above, the thread 21 is prevented from being entangled with the thread of the next color.

Next, when the sewing with the thread is started again after the sewing with the thread of the different color is finished, the main motor is driven at a low speed while the upper thread 21 is held by the holding mechanism 23. To start operation. As a result, the balance 20 and the needle bar 13 move up and down, respectively, as shown in the figure. In this case, the balance 20 is moved upward from the start of the main motor to the time point indicated by (D), and the upper thread 21 is paid out from the bobbin (not shown). Next, at the time of (E), as shown in (E) of FIG. 8, the blade tip 4a of the shuttle 4 is caught by the loop of the upper thread 21 formed under the cloth 55 by the needle 14, and then (F). At the time point of
The upper thread 21 caught on a is drawn under the cloth. Next, when the time point shown in (G) is reached and the time point shown in (H) is reached, the holding mechanism 23 is released. These (F) to (H)
In the process of, the upper thread of about 80 mm is projected under the cloth 55. After that, at the time point indicated by (I), as shown in FIG. 9 (I), the needle thread 4a of the shuttle 4 is attached to the loop of the needle thread 21 formed at the point of the next stitch point on the cloth 55 by the vertical movement of the needle 14. Is triggered. (At this time, the upper thread protruding below the cloth 55 is about 60 to 70 mm.) After that, the upper thread 21 caught on the sword tip 4a by the rotation of the hook 4 is the cloth 5
5, and the known entanglement between the upper thread and the lower thread is achieved. Further, at this time, the balance 20 and the needle 14 move upward, so that the needle thread 21 is pulled out from the cloth 55 by a short dimension.
The needle thread 21 protruding from the point of the first stitch below the cloth 55 has an extremely short length of, for example, about 10 to 20 mm. After that, after the time point (J) (state (J) in FIG. 9), sewing is performed as is well known.

In the case of the above-mentioned operation, the entanglement of the upper thread and the lower thread is not generally achieved in the steps (E) to (G), but depending on the kind of the cloth 55 and the upper thread 21 to be used, In some cases, the tip of the yarn 21 remains in the cloth 55 and the entanglement between the upper yarn 21 and the lower yarn is achieved.

Although only one color thread has been described above, the same operation is performed when sewing with threads of other colors.

[0019]

As described above, according to the present invention, the needle thread holding mechanism for always holding the needle thread is attached to the holding plate in the vicinity of each of the plurality of needle bars, and the needle thread holding mechanism is provided. Since the arm is equipped with a release mechanism for releasing the grasped state of the needle thread holding mechanism attached to the needle bar that has just arrived at the needle drop position, sewing with one color thread is completed. Sometimes, even if the cutting dimension of the upper thread end is short, the upper thread is grasped by the upper thread holding mechanism and the upper thread may be pulled out upward from the needle hole during the lateral movement of the needle bar. In addition to that, when sewing with any needle bar including the above needle bar, the needle thread on the needle bar above the needle drop is released and the effect that it can be freely used for sewing is provided. is there.

[Brief description of drawings]

FIG. 1 is a front view of a multi-axis sewing machine.

FIG. 2 is a vertical sectional view.

FIG. 3 is a bottom view showing the needle thread holding mechanism.

FIG. 4 is an enlarged sectional view taken along line IV-IV.

FIG. 5 is a bottom view showing the yarn end holding mechanism.

FIG. 6 is a front view showing a developed state of a holding frame.

FIG. 7 is a time chart showing operation timing.

FIG. 8 is an operation explanatory view showing a state at a time point shown by (A) to (E) of FIG.

FIG. 9 is an operation explanatory view showing a state at a time point indicated by (F) to (J) in FIG. 7.

[Explanation of code] 1 bed 4 shuttle 7 arm 13 needle bar 14 needle 23 needle thread holding mechanism 24 thread end holding mechanism

Claims (1)

Claim: What is claimed is: 1. A bed comprising a bed and an arm disposed above the bed. The arm is provided with a holding plate that supports a plurality of needle bars so as to be vertically movable. The needle bar is movably mounted so that the needle bar can be exchangeably positioned with respect to the straight-up position, while the bed is provided with a hook below the needle drop position, and By operating the hook in response to the vertical movement of one needle bar in the straight-up position, the needle thread on the needle bar side and the bobbin thread on the hook are used for embroidery. In the axial sewing machine, a multi-axis sewing machine characterized in that a first holding mechanism for holding the upper thread is provided at a position corresponding to the plurality of needle bars on the holding plate.