JP2000154455A - Threading device for embroidery machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a threading device for embroidery machine that can simplify the control and lower the production cost by simplify the structure of the driving mechanism for the yarn-stretching mechanism. SOLUTION: The yarn-stretching mechanism 8 in the threading unit is constituted with the yarn-nipping member 81, the lever 82 that supports the yarn- nipping member 81 on its top edge and is swingably supported via the spindle 82a to the machine head 1, the swinging operation mechanism 83 that swings the base edge of the lever 82, and the guide mechanism 84 that is vertically formed on the main body of the yarn-stretching mechanism 80, and guides the rollers 81a, 81b, 81c arranged to the yarn-nipping member 81 and regulates the swinging angle of the yarn-nipping member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threading device for an embroidery sewing machine, and more particularly to a method for exchanging a color thread (hereinafter, simply referred to as "thread" or "upper thread" in this specification). BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threading device in an embroidery sewing machine that can automatically perform processing when a thread breaks without manual intervention.

[0002]

2. Description of the Related Art Conventionally, in an embroidery sewing machine, when exchanging color threads or when a thread breaks, processing has been performed manually. By the way, the sewing machine must be stopped when the color thread is changed or when the thread breaks, and in particular, when the color thread is changed, one embroidery When the number of sewing machines is usually several or more, it is necessary to change the color thread for each of the sewing heads equipped with about 30 heads. There was a problem that productivity fell.

[0003]

SUMMARY OF THE INVENTION The inventor of the present invention has solved the above-mentioned problems of the conventional embroidery sewing machine, and has no need for manual operation when replacing colored yarns or when broken yarns. Automatically and at the same time reduce the time it takes,
An embroidery sewing machine with improved utilization and productivity of the sewing machine was proposed (PCT / JP97 / 02601 and PCT /
JP 97/02602).

As shown in FIGS. 1 to 4, this embroidery sewing machine includes a threading device 7 including a plurality of sewing heads 1, a thread supply device 2, a thread tensioning mechanism 3, and a threading mechanism 6, and a balance. Mechanism 4, thread cutting mechanism 52, and cut thread collecting mechanism 5
The main part is constituted by an auxiliary mechanism 5 such as 3.

[0005] In this embroidery sewing machine, a thread supply device 2 for supplying a plurality of color threads is provided with a bobbin accommodating section 22 capable of accommodating a plurality of color thread bobbins 21 as shown in FIGS. A thread holder 23 for pulling out the thread 11 of each bobbin 21 so as not to be entangled; and a thread adjusting mechanism provided integrally with the bobbin accommodating section 22 and provided in correspondence with the number of bobbins 21 that can be accommodated. 24 a thread tension adjusting mechanism 25;
Thread 1 by thread tension adjusting member 25b of thread tension adjusting mechanism 25
1 has a semi-cylindrical main body 24a having a thread tension releasing mechanism 26 for releasing the holding of the thread 1, a thread length adjusting mechanism 27 for holding the thread 11 to be sent toward the needle 10 by a predetermined length, and a thread sending mechanism 28. A thread selecting mechanism 2 for selectively positioning a thread adjusting mechanism 24 and a thread feeding mechanism 28 corresponding to a required bobbin 21 above a threading device 7 for threading a predetermined needle 10
9 and so on.

On the other hand, as shown in FIGS. 3 and 4, the yarn tensioning mechanism 3 for guiding the end of the yarn 11 suspended from the yarn delivery pipe 28a of the yarn supply device 2 by a predetermined length to a position near the needle 10 is provided. A thread holding member 31, a lever 32 provided with the thread holding member 31 at the distal end, a sliding piece 33 for swingably supporting a base end of the lever 32, and a thread tensioning mechanism body 30 substantially vertically. The guide tube 34 of the slide piece 33 provided and the guide piece 34
A rack 35 disposed in the vicinity of a descending position of a sliding piece 33 that meshes with a pinion 32a fixed to the base end of the lever 32 to regulate the swing angle of the lever 32; Roller 32 disposed at an intermediate position of
The guide mechanism 37 includes a guide groove 37 formed in a substantially vertical direction in the thread tensioning mechanism main body 30 that restricts the swing angle of the lever 32 by inserting the b, and a drive mechanism 38 that drives the belt 35.

Then, the thread 11 whose end is guided to a position near the needle 10 by the thread tensioning mechanism 3 is passed through a needle hole of the needle 10 by a threading mechanism (not shown) including a thread pulling-out mechanism or the like. It was led to 10a and threaded.

By the way, this embroidery sewing machine can automatically perform processing such as replacement of a color thread or breakage of a thread without manual operation, and also reduce the time required for the processing itself. And the operation rate and productivity of the sewing machine can be improved.
Since a drive mechanism such as the belt 35 is used, the structure and control thereof are complicated, and there is a problem that the manufacturing cost is increased.

In view of the problems of the threading device in the embroidery sewing machine, the present invention simplifies the control by simplifying the structure of the drive mechanism of the thread tensioning mechanism and reduces the manufacturing cost. It is an object of the present invention to provide a threading device in an embroidery sewing machine that can be used in a sewing machine.

[0010]

To achieve the above object, a threading device for an embroidery sewing machine according to the present invention comprises a thread clamping member for clamping an end of a thread suspended from a thread delivery pipe. A thread tensioning mechanism that guides the thread clamped by the clamping member to a position near the needle and hangs the thread on the balance of the balance mechanism while tensioning the thread; and a thread clamping member of the thread tensioning mechanism that is driven by the thread tensioning mechanism. In this state, the thread is hung at the upper position where the thread is clamped, and the thread is moved in the horizontal direction with respect to the thread clamping member while being lowered from the upper position to a predetermined position where embroidery is performed. By doing
After hanging the thread on the balance of the balance mechanism, a sub-balance of the balance mechanism installed at a predetermined position for performing embroidery in a state where the thread is hung,
A threading mechanism for an embroidery sewing machine comprising a threading mechanism for inserting a thread guided to a position near a needle through a needle hole, the thread being tensioned by a thread clamping member of the thread tensioning mechanism; A clamping member, a lever supporting the thread clamping member at the distal end, and swingably supported by the sewing machine head via a support shaft, a swing operation mechanism for swinging the base end of the lever, and a thread tensioning device And a guide mechanism which is formed substantially vertically in the mechanism body, guides a roller disposed on the thread holding member, and regulates a swing angle of the thread holding member.

The threading device in this embroidery sewing machine is
Since the drive mechanism of the thread tensioning mechanism is configured by a lever that is swingably supported on the sewing machine head via a support shaft and a swing operation mechanism that swings the base end of the lever. In addition, the structure of the driving mechanism can be simply configured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a threading device in an embroidery sewing machine according to the present invention will be described below with reference to the drawings.

One embodiment of a threading device in an embroidery sewing machine according to the present invention is shown in FIGS.

The threading device in this embroidery sewing machine, like the embroidery sewing machine shown in FIGS. 1 to 4, has a plurality of sewing heads, a thread supply device, a thread tensioning mechanism, and a threading mechanism. A main part is constituted by an auxiliary mechanism such as a device, a balance mechanism, a thread cutting mechanism, a cut thread collecting mechanism, and the like, and a sewing head provided with one to several embroidery sewing machines or from several heads to about thirty heads. One of them is shown as an example. The same configuration as that of the embodiment is adopted for other sewing heads other than those shown in the drawings, and each sewing head can be driven synchronously by various common driving sources. Accordingly, by interposing a clutch between a common drive source and each sewing head, or by providing an independent drive source for each sewing head, each sewing head can be driven independently. As such, these mechanisms
There is no fundamental difference from the embroidery sewing machine shown in FIGS.

In this embodiment, air cylinders, solenoids, and the like used as drive sources for various drive mechanisms may be replaced with other appropriate drive sources as required, although not described each time. In the present embodiment,
The connection between various drive mechanisms and the drive source is performed by connection mechanisms such as a link mechanism, a lever mechanism, and a wire mechanism.
Although this connection mechanism is not described each time, it can be replaced with another appropriate connection mechanism other than the embodiment as needed. In this embodiment, any high-pressure air generator other than a compressor can be used as a high-pressure air source used for sending out the yarn toward the needle, a high-pressure air source used for driving an air cylinder, and the like.

The thread tensioning mechanism 8 of the threading device of the embroidery sewing machine is provided below the thread supply device of the sewing machine head 1 and is suspended from the thread delivery pipe 28a of the thread supply device by a predetermined length. The thread holding member 81 and a guide member 81a protruding from the thread holding member 81 are supported at the distal end thereof, and are swung to the sewing machine head 1 via a support shaft 82a. A lever 82 movably supported, a swing operation mechanism 83 for swinging a base end of the lever 82, and a thread tensioning mechanism body 80 formed substantially vertically.
Rollers 81b, 81c, 81 provided on the thread holding member 81
and a guide mechanism 84 for guiding the rotation of the thread holding member 81 to regulate the swing angle of the thread holding member 81, and stoppers 85a and 85b of the lever 82.
And the stoppers 85c and 85d of the thread holding member 81.

As described above, the driving mechanism of the thread tensioning mechanism 8 is
The structure of the drive mechanism is simplified by comprising the lever 82 swingably supported on the sewing machine head 1 via the support shaft 82a and the swing operation mechanism 83 for swinging the base end of the lever 82. Can be configured.

The thread tensioning mechanism 8 is configured to swing a lever 83a of a swing operation mechanism 83 which is swingably disposed on a support shaft 83b attached to a fixed side of the sewing machine head 1 or the like by an arbitrary driving mechanism. Then, by raising and lowering the operation rod 83c, the thread holding member 81 is supported at the distal end via the operation rod 83c, and the lever 82 which is swingably supported by the sewing machine head 1 via the support shaft 82a is moved. The swing operation is performed, and the thread holding member 8 is
1 is moved from the substantially middle standby position to the highest position where the end of the yarn 11 suspended from the yarn delivery pipe 28a is clamped.

At this time, the shoe member 81e slidably disposed on the bracket 1a protruding from the sewing machine head 1 is provided so that the thread clamping member 81 can automatically clamp the end of the thread 11. The roller 81i disposed at the tip of the operation piece 81h protruding from the movable holding piece 81g of the thread holding member 81 comes into contact with the shoe member 81e so as to slide and protrude by an arbitrary driving mechanism, Movable holding piece 81g
Is released against the urging force of the spring member 81j, so that the end of the thread 11 hanging from the thread delivery pipe 28a is inserted between the fixed holding piece 81f and the movable holding piece 81g,
The shoe member 81e is swung by the drive mechanism, the contact between the shoe member 81e and the roller 81e is released, the movable holding piece 81g is returned, and the fixed holding piece 81f and the movable holding piece 8 are moved.
It is configured to hold the thread 11 inserted between the thread 11 and 1 g.

By driving the swing operation mechanism 83 in this state, the thread holding member 81 is moved from the highest position to the lowest position, and the thread 11 guided to a position near the needle 10 is moved to the needle 10. After threading through the needle hole 10a, the end of the thread 11 clamped by the thread clamping member 81 can be released to the lower part of the thread tensioning mechanism main body 80 so as to be swingable. An operating member 81k is provided.
With k, the roller 81i disposed at the tip of the operation piece 81h projecting from the movable holding piece 81g of the thread holding member 81 is pressed to open the movable holding piece 81g against the urging force of the spring member 81j. The configuration is as follows.

Rollers 81b, 81c, which are formed on the thread tensioning mechanism main body 80 in a substantially vertical direction and are disposed on the thread holding member 81,
In the present embodiment, the guide mechanism 84 that guides 81 d and regulates the swing angle of the thread holding member 81 is a roller 81.
a guide groove 84a for guiding b and 81c, and a roller 81d
And a guide groove 84a.
The guide edge 84b is formed to be curved at the lower end position of the yarn tensioning mechanism main body 80 so that the end of the yarn 11 can be guided to a position near the predetermined needle 10.

The stoppers 85a, 85 of the lever 82
b and the stoppers 85c and 85d of the thread clamping member 81 are respectively adjusted to the highest position where the thread clamping member 81 clamps the end of the thread 11 hanging down from the thread delivery pipe 28a and the lowest position where thread threading is performed. The position and the posture (swing angle) of the thread holding member 81 can be adjusted.

The yarn 11 tensioned between the yarn delivery pipe 28a of the yarn supply device 2 and the position near the needle 10 by the yarn tensioning mechanism 8
Is mounted on the balance 41 and the sub-balance 42 of the balance mechanism 4. In the present embodiment, three sets of the balance mechanism 4 and the needles 10 corresponding to the balance mechanism 4 are arranged, and these needles 1
Although the frame 1c provided with 0 is configured to swing in a horizontal plane, the number of sets of needles 10 provided in the frame 1c may be increased or decreased, or the frame 1c may be configured to slide in a horizontal plane. it can.

The balance 41 has a threading hole 41a at the tip.

The sub balance 42 has a ring-shaped thread hole 42.
a and a lever 42b having a thread hooking hole 42a disposed at the end thereof.
And a sliding piece 42c for slidably supporting the lever 42b.
The guide tube 42d of the sliding piece 42c disposed substantially vertically in the thread tensioning mechanism main body 80, and the sliding piece 42c are attracted to the thread clamping member 81 of the thread tensioning mechanism 8 so that the thread clamping member 81 A magnet piece 42e for elevating and lowering along the guide tube 42d in accordance with the elevating and lowering, and a roller 42 provided at the other end of the lever 42b
a shoe member 42g for restricting the position of the threading hole 42a by contacting the roller 42 with the roller 42 provided at the other end of the lever 42b.
and a spring member 42h for urging the f to contact the shoe member 42g.

The auxiliary balance 42 of the balance mechanism 4 drives the swing operation mechanism 83 of the lever 82 of the thread tensioning mechanism 8 to move the thread holding member 81 from the standby position substantially in the middle to the thread delivery pipe 28a. When the end of the thread 11 hung from the thread 11 is moved to the highest position, the slide piece 42c is attracted to the thread holding member 81 and the sliding piece 42c also moves to the highest position, and the thread sending hole 28a is inserted into the thread hooking hole 42a. The end of the hanging thread 11 is inserted.

When the yarn 11 is held by the yarn holding member 81 located immediately below the yarn hooking hole 42a, and the swing operation mechanism 83 of the lever 82 of the yarn tensioning mechanism 8 is driven in this state, the yarn holding member 81 Moves from the highest position to the lowest position. At this time, the sliding piece 42c is also attracted to the thread holding member 81, and the sliding piece 42c also descends. The suction with 81 is released and stops at this position, that is, the standby position at the bottom dead center. In addition, as the sliding piece 42c descends, a lever 42b having a thread hooking hole 42a in which the thread 11 is inserted is disposed at the tip.
The roller 42f disposed at the other end is the shoe member 42
g, against the urging force of the spring member 42h, slides in the horizontal direction according to the shape of the shoe member 42g.
Is passed through a thread hooking hole 41a formed at the tip of the balance 41. In addition, it is desirable to form a stopper such as a trap in the thread hooking hole 41a of the balance 41 in order to prevent the thread 11 that has been threaded from slipping out.

As a result, the thread 11 is hooked in the thread hooking hole 41a of the balance 41 and the thread hooking hole 42a of the sub-balance 42.
Embroidery is performed while being held in a required zigzag shape.
At the time of embroidery, the balance 41 is reciprocally driven by the same drive mechanism as the conventional embroidery sewing machine, while the sub-balance 42 is
It is held at the standby position at the bottom dead center.

The thread 11 guided to a position near the needle 10 by the thread tensioning mechanism 8 is moved by the threading mechanism 6 to the needle 1.
It is guided to the 0 needle hole 10a and threaded. At this time, in order to feed the yarn 11 held by the yarn holding member 81 of the yarn tensioning mechanism 8 toward the yarn pulling-out mechanism 61, the yarn holding member 8
1 is provided with an air nozzle 63.

By the way, in the embroidery sewing machine of this embodiment, after the threading is performed, the thread delivery mechanism is driven to drive the thread delivery pipe 28a in the state where the thread 11 is stretched. The embroidery is performed by moving to the step side (right side in FIG. 5). In addition, an auxiliary mechanism including a thread cutting mechanism and a cut thread collecting mechanism is provided on the path around which the thread 11 is looped.

Other configurations of the embroidery sewing machine according to the present embodiment are the same as those of the embroidery sewing machine shown in FIGS.

Next, a method of operating the embroidery sewing machine will be described. First, a description will be given of an operation method at a stage before embroidery. When embroidery is started, the bobbins of the respective color yarns are housed in the bobbin housing portions of the yarn supply devices arranged above the sewing machine head 1 of the embroidery sewing machine, and the yarn 11 drawn out from the bobbin is passed through the yarn holder. Hang over the thread tension adjustment mechanism,
The end of the yarn 11 is suspended from the yarn delivery pipe 28a by a predetermined length.

Next, an operation method for starting embroidery will be described. By driving the yarn supply mechanism over which the yarn 11 is wound, the yarn selection mechanism is driven, and selectively over the threading device 7 for threading the yarn delivery pipe 28a of the thread delivery mechanism corresponding to the required bobbin. And position it accurately. Thereafter, by releasing the yarn tension releasing mechanism, the yarn 11 is subjected to resistance by the yarn tension adjusting mechanism, and is lowered and advanced in advance so that the tip of the hook member 61a is inserted into the needle hole 10a of the needle 10. The high-pressure air is supplied from the air nozzle 63 provided on the thread holding member 81 to the thread 11 held by the thread holding member 81 of the thread tensioning mechanism 8 in the thread insertion hole 61c of the guide member 61b of the thread pulling mechanism 61. It is inserted by being fed toward the yarn pulling-out mechanism 61, and the yarn 11 held by the yarn length adjusting mechanism can be sent out, and the holding of the yarn 11 by the yarn holding member 81 is released.
The necessary length of the thread 11 held by the thread length adjusting mechanism is inserted into the thread insertion hole 61 c of the guide member 61 b of the thread pulling mechanism 61. Then, after the supply of high-pressure air from the air nozzle 63 is stopped, the thread pull-out mechanism 61 is retracted, and the hook member 61a of the thread pull-out mechanism 61 is hooked while the thread 11 inserted through the thread insertion hole 61c is hooked. Threading is performed by pulling out 61a from the needle hole 10a. In this case, by driving the yarn selection mechanism of the yarn supply device at an appropriate time, the yarn delivery pipe 28a is moved one step side (right side) in a state where the yarn 11 is stretched. Thereafter, by driving the swing operation mechanism 83 of the lever 82 of the thread tensioning mechanism 8, the thread holding member 8 is driven.
1 is returned to the standby position near the intermediate position, and embroidery is started. When replacing the yarn 11, the yarn 11 is cut by the yarn cutting mechanism, and the cut yarn 11 is collected by the cut yarn collecting mechanism. Hereinafter, the steps of threading and embroidering are repeated in the same manner.

[0034]

According to the threading device for an embroidery sewing machine according to the present invention, it is possible to automatically perform a process such as a process of changing a color thread or a process of breaking a thread without manual operation.
Since the time required for the operation can be shortened and the operation rate and productivity of the sewing machine can be improved, it can be particularly suitably used for an embroidery sewing machine in which a large number of color threads are frequently changed. . In particular, the threading device in this embroidery sewing machine is configured such that a driving mechanism of a thread tensioning mechanism is operated by swinging a lever which is swingably supported on a sewing head via a support shaft and a base end portion of the lever. Since the drive mechanism is constituted by the swing operation mechanism, the structure of the drive mechanism can be simplified, the control can be simplified, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall front view of a known embroidery sewing machine.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of a thread tensioning mechanism of the threading device.

FIG. 4 is a side view of a thread tensioning mechanism of the threading device.

FIG. 5 is a front view of the threading device in the embroidery sewing machine of the present invention.

FIG. 6 is a side view of the same.

FIG. 7 is a front view showing an upper part of a thread tensioning mechanism of the threading device when the thread holding member is moved to a highest position.

8A is a plan view, and FIG. 8B is a side view.

FIG. 9 shows a shoe member of a thread tensioning mechanism of the threading device;
(A) is a plan view and (b) is a side view.

10A and 10B show a lower portion of the thread tensioning mechanism of the threading device when the thread holding member is lowered, and FIG. 10A is a plan view and FIG. 10B is a front view.

FIG. 11 is a side view of the same.

12A and 12B show a thread holding member of a thread tensioning mechanism of the threading device, wherein FIG. 12A is a plan view, FIG. 12B is a front view, and FIG. 12C is a side view.

FIG. 13 is a perspective view of a main part of a threading mechanism of the threading device.

[Explanation of symbols]

 Reference Signs List 1 sewing machine head 10 needle 11 thread 4 balance mechanism 41 balance 42 sub balance 6 threading mechanism 61 thread pull-out mechanism 63 air nozzle 8 thread tensioning mechanism 80 thread tensioning mechanism main body 81 thread clamping member 82 lever 82a spindle 83 swing operation Mechanism 84 Guide mechanism 85a Stopper 85b Stopper 85c Stopper 85d Stopper

Claims (1)

[Claims] 1. A thread weighing mechanism comprising a thread clamping member for clamping an end of a thread suspended from a thread delivery pipe, guiding the thread clamped by the thread clamping member to a position near a needle, and stretching the thread while stretching the thread. A thread tensioning mechanism to be hung on a balance, and a thread tensioning mechanism that is driven by the thread tensioning member so that the thread can be threaded at an upper position where the thread is clamped by a thread clamping member of the thread tensioning mechanism. By moving the thread in the horizontal direction with respect to the thread holding member while lowering the thread from the upper position to a predetermined position where embroidery is performed, the thread is hooked on the balance of the balance mechanism, and then embroidery is performed in a state where the thread is hooked. An embroidery sewing machine comprising: a sub balance of a balance mechanism installed at a predetermined position; and a threading mechanism for inserting a thread held by a thread holding member of a thread tensioning mechanism and guided to a position near a needle through a needle hole. The thread tensioning device The mechanism (8) is connected to the thread holding member (81).
And a lever (82) that supports the thread holding member (81) at the distal end and is swingably supported by the sewing machine head (1) via a support shaft (82a), and a base end of the lever (82). A swing operation mechanism (83) for swing operation, and a thread tensioning mechanism main body (80)
A guide mechanism (84) for guiding the rollers (81a, 81b, 81c) disposed on the thread holding member (81) to regulate the swing angle of the thread holding member (81).
And a threading device in an embroidery sewing machine.