JPH10192580A - Multiple needle embroidering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an upper thread from the phenomenon of being tensed and loosened with a simple, compact and economical structure when a movable part of a head is moved by a color changing-over mechanism. SOLUTION: A multiple needle embroidering machine is constituted from a fixed part 35 of a head provided fixedly, a movable part 32 of the head provided movably to support a plurality of needle bars moved vertically, a color changing-over mechanism to move the movable part 32 of the head relative to the fixed part 35 of the head, a bobbin holder 13 and a thread path device 25 to guide or tens an upper thread. Then, the bobbin holder 13 is provided fixedly and the thread guide device 25 is provided to be moved together with the movable part 32 of the head. An upper thread guide pipe 15 with the flexibility and slackness affords communication between the thread erecting device 13 and the thread guide device 25 so that the upper thread T payed off from a bobbin 10 is guided through the inside of the upper thread guide pipe 15 to the thread guide device 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-needle embroidery sewing machine provided with a plurality of needle bars and a color changing mechanism thereof.

[0002]

2. Description of the Related Art A conventional multi-needle embroidery sewing machine shown in FIG. 9 is known as a conventional multi-needle embroidery sewing machine. The embroidery sewing machine 50 is provided on a front surface of a bridge 52 provided on a table 51. An embroidery head 53 comprising a head fixing portion 60 and a head movable portion 59 provided, a thread path device 54 attached to an upper portion of the head movable portion 59, and a thread stand device 56 fixed above the bridge 52. Have. The yarn path device 54 is provided with a yarn guide 6 for guiding the upper thread T.
1 and a thread tensioner 62 for applying tension to the upper thread T. The thread stand 56 is for setting the bobbin 55 around which the upper thread T is wound.

The head fixing section 60 is fixed to the bridge 52 so as not to move, and has a needle bar driving mechanism (not shown). The head movable portion 59 is supported movably in the left-right direction via a rail (not shown) so as to be movable with respect to the head fixing portion 60, and moves up and down a plurality of needle bars 58 having needles 57 attached to the lower end. It is designed to be freely supported. Then, the color changing mechanism (not shown) is used to
Is moved with respect to the head fixing unit 60 so that one of the plurality of needle bars 58 is positioned on the needle bar driving mechanism of the head fixing unit 60.

[0004] However, the head movable section 5 is operated by a color changing mechanism.
When the needle 9 is moved, the upper thread T is pulled or loosened between the thread path device 54 that moves together with the head movable portion 59 and the thread stand device 56 fixed to the bridge 52. However, there is a problem in that the tension of the thread changes, the sewing condition varies, and thread breakage occurs.

In order to solve this problem, not only the yarn path device but also the movement of the head movable portion by the color changing mechanism is used.
A multi-needle embroidery sewing machine in which a thread stand device is also moved has been proposed (Japanese Utility Model Laid-Open No. 6-46676, Japanese Utility Model Laid-Open No. 6-81478).

However, in order to move the thread stand device, it is necessary to newly install a large-scale rail device for movably supporting the thread stand device in the bridge or to increase the driving capability of the color changing mechanism. However, there is a problem that the size of the sewing machine is increased and the cost is considerably increased. In addition, since the thread stand is itself large and not very rigid,
If the bobbin is moved or stopped at a high speed during the color change, the bobbin may shake or rotate, and the upper thread wound on the bobbin may be loosened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple, compact and inexpensive structure that can prevent the upper thread from being pulled or loosened when the movable portion of the head is moved by the color changing mechanism. It is an object of the present invention to provide a multi-needle embroidery sewing machine which can prevent the variation of the embroidery and the thread breakage.

[0008]

In order to achieve the above object, a multi-needle embroidery sewing machine of the present invention is provided so as not to move, and has a head fixing portion provided with a needle bar driving mechanism, and a head fixing portion. The head movable portion, which is provided so as to be movable and supports a plurality of needle bars having needles attached to the lower end so as to be able to move up and down, and moves the head movable portion with respect to the head fixed portion,
A color changing mechanism for positioning one of the plurality of needle bars in the needle bar drive mechanism, a thread stand device for setting up a bobbin around which the upper thread is wound, and a needle thread supplied from the bobbin to the needle. In a multi-needle embroidery sewing machine provided with a thread path device for guiding or applying tension to the upper thread, the thread stand device is provided so as not to move, and the thread path device is provided so as to move with the head movable portion. The device and the yarn guiding device are connected with a flexible upper yarn guiding tube with slack, and the upper yarn released from the bobbin is passed through the upper yarn guiding tube to the yarn guiding device. It is characterized by having done.

Here, the arrangement of the needle bars and the color changing mechanism are as follows.
Although not particularly limited, the following embodiments can be exemplified. (1) A mode in which a plurality of needle bars are arranged at intervals in a plane linear shape on the head movable portion, and the head movable portion is moved along the straight line. (2) A mode in which a plurality of needle bars are arranged at intervals in a plane arc shape on the head movable portion, and the head movable portion is moved along the arc.

The method of providing the thread stand is not particularly limited, but the following embodiments can be exemplified. (1) A mode in which a thread stand device is provided above an arm supporting one embroidery head. (2) An embodiment in which a thread stand device is provided above a bridge that supports two or more embroidery heads. (3) A mode in which a thread stand device is provided behind a bridge that supports two or more embroidery heads. (4) An embodiment in which a thread stand device is provided below the table of the embroidery sewing machine.

The yarn path device is not limited to a specific structure, but may be a known yarn guide or a known thread tension. Further, the yarn path device may be provided directly on the movable head portion, or may be provided on a table detachably attached to the movable head portion.

The upper thread guide tube may have any flexibility so that it can bend between the non-moving thread stand device and the moving thread path device following the movement. The inner surface of the upper thread guide tube preferably has good slippage. Urethane tubes, vinyl tubes,
Examples thereof include a resin tube such as a nylon tube, and a rubber tube having good slippage. The manner in which the upper thread guide tube is slackened is not particularly limited, and examples thereof include a mode in which the upper thread guide tube is simply bent downward, formed into a loose wavy shape, or formed into a loose spiral shape.

Further, the yarn path device can be provided so as to be displaceable with respect to the movable portion of the head at the time of maintenance, and the way of slackening the upper yarn guide tube can be set so as to allow the displacement.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a multi-head, multi-needle embroidery sewing machine 1 according to a first embodiment of the present invention.
Is shown. This multi-needle embroidery sewing machine 1 includes a bridge 4 that is horizontally installed above a table 3 and, for example, four embroidery heads 2 that are continuously provided at an interval in front of the bridge 4.
For example, four thread stand devices 13 fixed to the rear side of the bridge 4 corresponding to the embroidery head 2, an embroidery frame 6 movably provided on the table 3, and an embroidery frame 6 provided on the upper right of the table 3. And a controller 7 for inputting embroidery data, sewing machine operation instructions and the like.

As shown in FIGS. 1 and 2, the embroidery head 2 is supported by a head fixing portion 35 fixed to the front side of the bridge 4 so as not to move, and movably in the left-right direction via a rail 33. And a head movable section 32.

The head fixing portion 35 is provided with a needle bar tapping 39 of a needle bar driving mechanism. Reference numeral 34 denotes a needle bar driving position by the needle bar tapping 39. The needle bar drive mechanism is not limited to a specific configuration, and a known mechanism can be used.

In the head movable portion 32, for example, five needle bars 31 each having a needle 30 attached to the lower end thereof are arranged at intervals in a plane linear shape in the left-right direction, and each is supported so as to be able to move up and down. I have. Then, one needle bar 31 located at the needle bar drive position 34 of the head fixing portion 35 is driven to move up and down by a needle bar hit 39. Five balances 8 are provided above the head movable section 32.

The switching of the needle bar 31 is performed by a color changing mechanism 36. The color changing mechanism 36 moves the head movable portion 32 with respect to the head fixing portion 35 along the rail 33, and One needle bar 31 is moved to the needle bar driving position 3
No.4. The color changing mechanism 36 includes a single rod 37 provided so as to penetrate the entire head movable portion 32 in parallel with the bridge 4.
The bridge 4 is slidably supported in the left-right direction. The right end of the rod 37 is connected to a drive unit 38, and the drive unit 38 drives the rod 37 in the left-right direction in response to a color change instruction from the controller 7. Each of the head movable parts 32 is fixed to a rod 37, and when the rod 37 is driven and slid, the head movable parts 32 of all the embroidery heads 2 slide at the same time, and the color change is performed simultaneously by all the embroidery heads 2. It has become.

A yarn path device 2 is provided above the head movable section 32.
5 is detachably fixed to the base 26 by screws or the like, and the yarn path device 25 guides the upper thread T and applies five tension to the upper thread T. And five thread tensioners 28 for applying tension to the thread T. Accordingly, the yarn path device 25 is moved together with the movement of the head movable portion 32 by the color changing mechanism 36.

Since the thread stand 13 is fixed to the bridge 4 with bolts, the relative position of the head fixing portion 35 also fixed to the bridge 4 to the needle bar driving position 34 is fixed. As shown in FIG. 3 and FIG.
And the yarn guide 27 of the yarn path device 25 are loosely connected by the upper yarn guide tube 15 composed of five flexible urethane tubes, and the upper yarn T released from the bobbin 10 is loosened. The yarn is guided to the yarn guide 27 through the inside of the upper yarn guide tube 15.

The thread stand 13 is provided with a thread stand 16 and five thread stand pins 12 erected on the thread stand 16 at a fixed interval. A bobbin 10 on which T is wound is extrapolated and set up. At this time,
The upper end of the thread stand pin 12 projects from the upper part of the bobbin 10. The thread stand 13 includes the thread stand pin 1
2, the lower end of the thread guide pin 27 is located below the thread guide 27, and as shown in FIG.
2 is provided so that the upper part of the bobbin 10 extrapolated can be seen, so that the remaining amount of the upper thread T wound on the bobbin 10 from the front side can be easily checked.

As shown in FIG. 5, the thread stand pin 12 comprises a cylinder 17 having an open upper end and a lower end, and a cap 18 fitted into the upper end of the cylinder 17. Nuts 22, 22 screwed into threaded female threads
Is set on the thread stand 16. Cap 18
Is provided with a flange portion 24, and the flange portion 24 covers the end face of the opening at the upper end of the cylinder 17. The inner peripheral edge and the outer peripheral edge of the upper surface of the flange portion 24 are formed such that the entire periphery is a smooth curve. As shown in FIGS. 5 and 6, a cutout 20 through which the upper thread T can pass from outside to outside of the thread stand pin 12 is provided on the upper surface of the flange portion 24.

At the upper end of the platform 26 of the yarn path device 25, FIG.
As shown in FIG. 5, a stopper 29 is provided in which five holes 23 penetrating the front side and the rear side are horizontally arranged.
A cap 19 is fitted from the front side. The cap 1
9 is similar to the cap 18 except that the notch 20 is not provided.

As shown in FIG. 5, one end of each upper thread guide tube 15 is inserted from the opening at the lower end of each thread stand pin 12 until the tip of the upper thread guide tube 15 hits the lower side of the cap 18. I have. The outer periphery of the upper thread guide tube 15 is formed slightly thicker than the inner periphery of the thread stand pin 12, so that once inserted into the thread stand pin 12, it does not easily come off.

The other end of each upper thread guide tube 15 is shown in FIG.
As shown in the figure, the holes 23 are inserted from the rear side until the front ends of the holes come into contact with the rear side of the cap 19, and cannot be easily pulled out when inserted once like the thread stand pin side.

As described above, the upper yarn guide tube 15 is connected so that air leakage does not occur on the way from the opening at the lower end of the thread stand pin 12 to the vicinity of the yarn guide 27 of the yarn path device 25. is there. Further, even when the yarn path device 25 is moved to the maximum by the color change, each of the upper yarn guide tubes 15 is slackened so as to allow the movement (to prevent the upper yarn guide tube 15 from being extended and hindering). The arrangement is set, and is arranged between the yarn stand device 13 and the vicinity of the yarn guide 27.

The upper thread T is supplied to the thread stand pin 12 and the upper thread guide tube 1.
In order to insert the needle thread 5 through the bobbin 10, the needle thread T enough to be inserted into the thread stand pin 12 and the needle thread guide tube 15 is first released. Next, the tip of the upper thread T is inserted into the thread stand pin 12 through the notch 20 provided in the cap 18.
On the other hand, an air gun extended by a tube from an air compressor (not shown) is held in a hand, and a nozzle 21 of the air gun is held.
Is brought into contact with the opening edge at the upper end of the thread stand pin 12, and the nozzle 2
Inject the pressurized air from 1. Then, the upper thread T is forcibly fed into the hollow portion of the thread stand pin 12 and the upper thread guide tube 15 through the notch 20 by the air flow, and the upper thread T is discharged from the end of the upper thread guide tube 15 on the side of the yarn path device 25. Will be sent out. Thus, the upper thread T can be instantaneously inserted.

The multi-needle embroidery sewing machine 1 constructed as described above.
According to this, at the time of color change, the head movable section 32 and the yarn path device 25 are simultaneously moved by the color change mechanism. At this time, as shown by a two-dot chain line in FIG. 4, the relative position between the yarn path device 25 and the yarn stand device 13 fixed to the bridge 4 changes. The thread is passed through the upper thread guide tube 15 provided with slack in advance, and the expansion and contraction of the upper thread guide tube 15 can be ignored, so that the phenomenon that the upper thread T is pulled or loosened can be prevented. For this reason, the tension of the upper thread T does not change, and it is possible to prevent variations in the sewing condition and breakage of the thread. Further, the upper thread T between the two 13 and 25 does not become entangled.

Further, since the thread stand 13 is fixed to the bridge 4, the bobbin 10 does not shake or rotate at the time of color change unlike the conventional example, and the upper thread T wound around the bobbin 10 is There is no risk of sagging.

The upper thread T released from the bobbin 10 is
Immediately from the opening at the upper end of the thread stand pin 12, the periphery is constantly restrained by the thread stand pin 12 and the upper thread guide tube 15. Therefore, even if the upper thread T has a strong twist, it is formed into a loop. In addition, the upper thread T between the adjacent bobbins 10 does not become entangled.

Further, since the thread stand 13 is provided low so that the lower end position of the thread stand pin 12 is lower than the thread guide 27, when the bobbin 10 is inserted into or removed from the thread stand 13, Can be easily worked without stretching or riding on a table. Similarly, in a multi-head type multi-needle embroidery sewing machine in which a large number of bobbins 10 are densely arranged on the thread stand device 13, the bobbin 10
Can be easily inserted and removed.

Similarly, since the thread stand 13 is provided at a low position, the influence of the vibration generated by the embroidery operation of the multi-needle embroidery sewing machine 1 on the thread stand 13 is small. For this reason, the upper thread T wound on the bobbin 10 is less likely to loosen or sag, and the upper threads T of the adjacent bobbins 10 are entangled with each other, or the upper thread T enters under the bobbin 10 and is caught. The problem of occurrence of cutting is less likely to occur.

The upper thread guide tube 15 connects the lower end of the thread stand pin 12 to the vicinity of the thread guide 27 of the thread path device 25 so that air is not leaked on the way. Since the upper thread T is passed through the thread pin 12 and the upper thread guide tube 15 by the flow, the thread pin 1
Even when the total length of the second and upper thread guide tubes 15 is long, or when a curve having a large curvature is provided in the path between the thread stand pin 12 and the upper thread guide tube 15, the upper thread can be instantaneously inserted. . Therefore, there is no problem that threading becomes difficult as in the case of using a known wire-like threading device.

Further, since the notch 20 is provided at the opening edge of the upper end of the thread stand pin 12, when the upper thread T is inserted through the thread stand pin 12 and the upper thread guide tube 15, the nozzle 2 of the air gun is used.
The upper thread T can be smoothly passed between the nozzle 21 and the thread pin 12 through the notch 20 even when the pin 1 is in contact with the opening edge of the upper end of the thread pin 12. Therefore, in order to create a gap through which the upper thread T can pass, the nozzle 2
1 does not need to be slightly lifted from the opening edge of the upper end of the thread stand pin 12, and the upper thread T
Can be easily inserted.

FIG. 8 shows a main part of the embroidery sewing machine according to the second embodiment, which differs from the first embodiment only in the following points. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals in FIG.

In the present embodiment, a Y-shaped joint 41 is provided at a position of the upper thread guide tube 15 near the thread stand pin 12, and an inlet 42 of the Y-shaped joint 41 is connected via a manual valve 43 to the air compressor (not shown). (Abbreviated). When the manual valve 43 is depressed, air pressurized by the air compressor is jetted from the manual valve 43, and an air flow flows into the upper yarn guide tube 15 in the direction of the yarn path device 25. The opening edge of the upper end of the thread stand pin 44 is not provided with a notch unlike the first embodiment.

The upper thread T is supplied to the thread stand pin 12 and the upper thread guide tube 1.
In order to allow the thread stand 12 to penetrate through the bobbin 10 and the thread stand pin 12 and the upper thread guide tube 15,
Solve. Next, the tip of the upper thread T is inserted into the opening at the upper end of the thread stand pin 12. When the manual valve 43 is depressed, pressurized air is jetted, and the air flow is changed to a Y-shaped joint 41.
Flows into the upper yarn guide tube 15 in the direction of the yarn path device 25 through the inflow port 42. Then, the upper thread T is forcibly drawn into the hollow portion of the thread stand pin 12 by the air flow, and is sent out from the end of the upper thread guide tube 15 on the side of the thread path device 25.
Thus, the upper thread T can be instantaneously inserted.

According to the present embodiment, the air flow is sent to the hollow portion of the upper yarn guide tube 15 via the Y-type joint 41, so that when the upper yarn T is passed, the yarn flows as in the first embodiment. There is no need to contact the nozzle 21 of the air gun with the opening edge of the upper end of the vertical pin 12. For this reason, the upper thread T can be inserted more easily than in the first embodiment.

Note that the present invention is not limited to the configuration of the above-described embodiment, and can be embodied by appropriately changing the scope of the invention as follows, for example, as follows.

(1) For maintenance of the yarn path device 25, the workability is improved by displacing the yarn path device 25 by inclining it forward or removing it from the head movable section 32. Therefore, it is preferable to set the slack of the upper thread guide tube 15 so as to allow the displacement of the thread guide device 25 (to prevent the upper thread guide tube 15 from extending and becoming an obstacle). In this case, it is preferable that the upper thread guide tube 15 is formed into a gentle wavy shape or a loose spiral shape. When the upper yarn guide tube 15 is simply bent downward, it is preferable to increase the deflection.

(2) The thread stand pins are provided to be inclined forward or backward so that the bobbin is inclined. (3) The notch provided at the upper opening edge of the thread stand pin is provided not at the thread stand pin but at the opening edge at the tip of the nozzle of the air gun. (4) A thread guide having a flange portion is provided at the upper end of the thread stand pin or bobbin, so that the upper thread wound on the bobbin is separated from the bobbin outward by the flange portion so as to be unwound. thing. (5) The thread stand device is provided below the table of the embroidery sewing machine.

[0042]

As described above in detail, according to the multi-needle embroidery sewing machine according to the present invention, the phenomenon that the upper thread is pulled or loosened when the movable portion of the head is moved by the color changing mechanism can be easily reduced. And can be prevented with a compact and inexpensive structure,
As a result, it is possible to prevent variations in sewing condition and thread breakage.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a part of an embroidery head of the multi-needle embroidery sewing machine in an opened state.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a plan view of a main part of the multi-needle embroidery sewing machine.

FIG. 5 is a partial sectional view of the thread stand of the multi-needle embroidery sewing machine.

FIG. 6 is a view taken along the arrow VI in FIG. 5;

FIG. 7 is a partial cross-sectional view of a thread path device of the multi-needle embroidery sewing machine.

FIG. 8 is a side sectional view of a second embodiment embodying the present invention.

FIG. 9 is a side sectional view of a conventional multi-needle embroidery sewing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-needle embroidery sewing machine 2 Embroidery head 10 Bobbin 13 Thread stand 15 Upper thread guide tube 25 Threading device 27 Thread guide with tension application mechanism 28 Thread tension 30 Needle 31 Needle bar 32 Head movable part 34 Needle bar drive position 35 Head Fixed part 36 Color change mechanism 39 Needle bar tapping of needle bar drive mechanism T Needle thread

Claims (2)

[Claims] 1. A head fixing portion provided so as not to move and provided with a needle bar driving mechanism, and a plurality of needle bars provided movably with respect to the head fixing portion and having a needle attached to a lower end thereof. A head movable portion that is supported to be able to move up and down, and a color that moves the head movable portion with respect to the head fixing portion and positions one of the plurality of needle bars on the needle bar driving mechanism. A multi-needle including a replacement mechanism, a thread stand device for setting up a bobbin around which the upper thread is wound, and a thread path device for guiding the upper thread supplied from the bobbin to the needle or applying tension to the upper thread. In the embroidery sewing machine, the thread stand device is provided so as not to move, the thread path device is provided so as to move together with the head movable section, and a flexible space is provided between the thread stand device and the thread path device. Connect with slack with the yarn guide tube, and from the bobbin Multi-needle embroidery sewing machine, characterized by being configured to direct to said yarn path device through the upper thread that he inside of the upper yarn guide pipe. 2. The apparatus according to claim 1, wherein the yarn path device is provided so as to be displaceable with respect to the head movable portion at the time of maintenance, and the way of slackening the upper yarn guide tube is set so as to allow the displacement. Multi-needle embroidery sewing machine.