JP3162082B2 - Threader in embroidery sewing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an embroidery sewing machine, and in particular, when exchanging a color thread (in this specification, it may be simply referred to as “thread” or “upper thread”) or when a thread breaks. The present invention relates to an embroidery sewing machine capable of automatically performing processing when the sewing machine does not require manual operation.

2. Description of the Related Art Conventionally, in an embroidery sewing machine, processes such as when a color thread is replaced or when a thread breaks have 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.

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the conventional embroidery sewing machine, and can automatically perform processing such as replacement of a color thread or breakage of a thread without manual operation. In addition, an object of the present invention is to provide an embroidery sewing machine in which the operating time and productivity of the sewing machine are improved by shortening the time required for the sewing machine.

In order to achieve the above object, a threading device in an embroidery sewing machine according to the present invention includes a thread clamping member that clamps an end of a thread hanging down from a thread delivery pipe, and a thread clamped by the thread clamping member is used for a needle. A yarn tensioning mechanism for guiding the yarn to a nearby position and hanging the yarn on the balance of the balance mechanism while tensioning the yarn, and a yarn at an upper position where the yarn is clamped by the yarn clamping member of the yarn tensioning mechanism following the yarn tensioning mechanism. In the state where the thread is hooked, the thread is moved horizontally with respect to the thread pinching member while being lowered from this upper position to a predetermined position where embroidery is performed. After hanging the thread, the auxiliary balance of the balance mechanism installed at a predetermined position where embroidery is performed with the thread applied, and the thread held by the thread holding member of the thread tensioning mechanism and guided to the position near the needle With the threading mechanism inserted through the needle hole And wherein the Rukoto.

According to the threading device in the embroidery sewing machine of the present invention,
It is possible to automatically carry out processing such as when changing the color thread or when the thread breaks without manual intervention, and also to reduce the time required for the operation, thereby improving the operating rate of the sewing machine and Productivity can be improved.

Further, according to the threading device in the embroidery sewing machine, the thread tensioning mechanism guides the thread clamped by the thread clamping member to a position near the needle, and places the thread on the balance of the balance mechanism while stretching the thread. Further, the sub-balance of the balance mechanism is driven by the thread tensioning mechanism, and is set at a predetermined position where embroidery is performed in a state where the thread is hooked, whereby each of the embroidery sewing machine including the balance of the balance mechanism and the sub-balance is mounted. With a simple mechanism, the thread can be automatically and reliably wrapped around the mechanism, so that the embroidery operation can be performed.

Further, according to the threading device in the embroidery sewing machine, the threading accuracy can be improved.

In this case, by configuring the threading mechanism with the thread pulling-out mechanism and the air nozzle, it is possible to further improve the threading accuracy and to simplify the threading mechanism.

Further, by providing a thread pressing mechanism that pushes both ends of the thread inserted into the thread insertion hole formed in the guide member of the threading mechanism along the side surface of the guide member, it is possible to further improve threading accuracy. .

In addition, an operating rod having a thread cutting mechanism and a hook for hooking the thread at the end thereof, and an operating rod slidably inserted in the path where the thread is wound, and suction for pulling in and collecting the cut thread. By disposing the cut thread collecting mechanism provided with the pipe, it is possible to automatically and reliably collect the passed thread when exchanging the color thread or when the thread breaks.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a first embodiment of a thread supply device in an embroidery sewing machine according to the present invention, FIG.
FIG. 3 is a plan view thereof, and FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is a perspective view showing a thread holder of the thread supply device of the first embodiment of the embroidery sewing machine according to the present invention, and FIG.
The figure shows a thread tension release mechanism, (a) is a side view, (b) is a front view, FIG. 7 shows a thread length adjusting mechanism, and (a)
FIG. 8 is a side view, FIG. 8B is a plan view, FIG. 8 shows a thread sending mechanism, FIG. 8A is a side view, FIG. 8B is a front view, and FIG.

FIG. 9 is a front view showing a modified example of the first embodiment of the thread supply device in the embroidery sewing machine of the present invention, FIG. 10 is a side view thereof, FIG. The figure is a perspective view of the main part.

FIG. 13 is a side sectional view showing a thread holder of a variation of the first embodiment of the thread supply device in the embroidery sewing machine of the present invention.

FIG. 14 shows a first embodiment of a threading device for an embroidery sewing machine according to the present invention.
The example is shown, (a) is a side view, (b) is a front view.

FIG. 15 is a front view of a thread tensioning mechanism of the threading device of the embroidery sewing machine of the present invention, FIG. 16 is a side view of the thread tensioning mechanism, and FIG. (A) is a plan view, (b) is a side view, and (c) is a front view.
The figure shows a threading mechanism, (a) is a side view, (b) is a front view, (c) is a plan view, and FIG. 19 is an explanatory view showing an operation state of a thread pushing mechanism of the threading mechanism. FIG. 20 is a perspective view of a main part of the threading mechanism, FIG. 21 shows a thread pull-out mechanism, (a) is a plan view, (b) is a side view, and (c) is an exploded perspective view. Fig. 22 shows the thread cutting mechanism, and (a)
Is a plan view, (b) is a front sectional view, FIG. 23 shows a cut yarn collecting mechanism, (a) is a front view, (b) is a plan view, and FIG. 24 detects a state of a yarn. Indicating which sensor
(A) is a plan view, (b) is a perspective view.

FIG. 25 is a front view showing a second embodiment of the embroidery sewing machine according to the present invention.

26A and 26B show a thread holder of a thread supply device in an embroidery sewing machine according to a second embodiment of the present invention, wherein FIG. 26A is a front view, and FIG.
FIG. 27 is a side view, FIG. 27 (c) is a plan view, FIG. 27 is a side view of the thread supply device in the embroidery sewing machine of the present invention, and FIG. 28 is a second embodiment of the thread supply device in the embroidery sewing machine of the present invention. FIG. 29 shows a modification of the example, in which (a) is a front view, (b) is a side view, FIG. 29 is a perspective view thereof, FIG. 30 is a front view of a thread adjusting mechanism, and FIG. FIG. 32 is a cross-sectional view of a main part of the pipe member, and FIG. 32 is a cross-sectional view of a main part of the yarn adjusting mechanism.

FIG. 33 shows a second embodiment of the threading device for an embroidery sewing machine according to the present invention.
FIG. 34 is a front view of the embodiment, and FIG. 34 is a side view thereof.

FIG. 35 shows a modification of the thread clamping member of the thread tensioning mechanism, wherein (a) is a front view, (b) is a plan view, (c) is a side view, and FIG. 36 is a perspective view thereof. 37 is a perspective view of a thread pulling mechanism, FIG. 38 is a perspective view of a modified example of the thread pulling mechanism, and FIG. 39 shows a thread collecting mechanism.
Is a plan view, (b) is a front view, and FIG. 40 is a perspective view thereof.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of an embroidery sewing machine according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the 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, a balance mechanism 4, and a cutting machine. The main part is constituted by an auxiliary mechanism 5 such as a yarn collecting mechanism.

Note that the drawing of this embodiment exemplarily shows one of the sewing machine heads provided for one embroidery sewing machine from about several heads to about 30 heads. 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. However, these mechanisms are not fundamentally different from conventionally known embroidery sewing machines.

Further, it is preferable that the thread supply device 2, the auxiliary mechanism 5 such as the cut thread recovery mechanism, and the threading device 7 included in the sewing machine head of the embroidery sewing machine of this embodiment include all of them. Some of the devices may be replaced with other mechanisms having the same function, or may be omitted.

In this embodiment, the air cylinders, solenoids, and the like used as the drive sources of the various drive mechanisms can be replaced with other appropriate drive sources as needed, although not described each time.

Further, in the present embodiment, the connection between the various drive mechanisms and the drive source is performed by connection mechanisms such as a link mechanism, a lever mechanism, and a wire mechanism. Thus, the connection mechanism can be replaced with another appropriate connection mechanism other than the embodiment.

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.

These points are the same in the following other embodiments.

1 to 8 show a first embodiment of a thread supply device 2 disposed above a sewing head 1 of an embroidery sewing machine.

The yarn supply device 2 includes a bobbin storage portion 22 that can store a plurality of bobbins 21 of color yarns, and a yarn that is provided integrally with the bobbin storage portion 22 and that is provided in correspondence with the number of bobbins 21 that can be stored. A tension adjusting mechanism 25, a yarn adjusting mechanism 24 having a semi-cylindrical body 24a having a yarn length adjusting mechanism 27 for holding the yarn 11 to be sent out toward the needle 10 by a predetermined length, and a yarn sending mechanism 28; A thread selection mechanism 27 for selectively positioning a thread delivery mechanism 28 corresponding to the bobbin 21 above a threading device 7 for threading a predetermined needle 10.

In the present embodiment, the bobbin storage section 22 and the thread adjusting mechanism 24 provided integrally with the bobbin storage section 22 are configured as a unit, and this is detachably attached to the sewing head 1.

The bobbin storage section 22 has, for example, 12 bobbins 21 inclining slightly forward in the upper row, and 6 bobbins 21 in the lower row horizontally.
In the bobbin storage part 22, the bobbin 21 is inserted into the bottom surface, the spindle 22a to be supported is erected, and the thread 11 of each bobbin 21 is pulled out so as not to be entangled. Thread holder 23 for a total of 18
The thread 11 is pulled out from the thread holder 23 at an interval, and is sent to a thread tension adjusting mechanism 25 of a thread adjusting mechanism 24 integrally attached to a lower portion of the bobbin housing 22.

The thread holding member 23 is a swinging piece supporting shaft set up between the bobbins 21.
Thread insertion hole 2 for pulling out the thread 11 so that it does not become entangled in 23c
A rocking piece 23a having a hole 3b is provided so as to be rockable above the bobbin 21, and a notch 2 formed at the base of the rocking piece 23a.
The swing piece 23a can be fixed at a predetermined position by fitting 3d to a projection 23e projecting from the swing piece support shaft 23c.

By arranging the swinging piece 23a so as to be swingable, the bobbin 21 can be easily attached to and detached from the bobbin storage section 22.

An axial groove 23f is formed at the upper end of the rocking piece support shaft 23c, and the base of the rocking piece 23a comes out of the rocking piece support shaft 23c by slightly expanding the upper end of the groove 23f. Not to be.

The thread tension adjusting mechanism 25 has three thread tension adjusting members 25a, 25b, and 25c provided on the outer peripheral surface of the semi-cylindrical body 24a of the thread adjusting mechanism 24 for each thread 11 from each bobbin 21.

One of the yarn tension adjusting members 25c is provided with a tension sensor 25d for measuring the tension of the yarn 11, so that the yarn 11 can be detected as a broken yarn.

The signal from the tension sensor 25d is embroidered as an electric signal from an electric contact (not shown) provided on the thread adjusting mechanism 24 via an electric circuit (not shown) provided with an electric contact provided on the sewing machine head 1. Sent to the control unit of the sewing machine for
In addition to controlling the driving of the embroidery sewing machine, a display lamp (not shown) for displaying the state of the upper thread and the lower thread disposed on the sewing machine head 1 and the like is turned on to notify the operator of the breakage of the thread 11. To

In addition to the display lamp, a display device such as a liquid crystal display panel for displaying the state of the embroidery sewing machine to an operator and an alarm device such as a buzzer can be provided at an appropriate position of the embroidery sewing machine.

In order to prevent a large resistance from being applied to the yarn 11 when sending the yarn 11 toward the needle 10, a yarn tension adjusting member 25 is provided.
A thread tension release mechanism 26 for releasing the holding of the thread 11 by b is provided.

As shown in FIG. 6, the thread tension releasing mechanism 26 is provided with a thread tension releasing plate 26b which is oscillated by a solenoid 26a provided on the sewing machine head 1 side. The spring is compressed to release the holding of the yarn 11 by the yarn tension adjusting member 25b.

Yarn length adjustment mechanism provided below the yarn tension adjustment mechanism 25
27 is for holding the yarn 11 to be sent out toward the needle 10 by a predetermined length, and the yarn 11 held by the yarn length adjusting mechanism 27 When the embroidery operation is started, the thread 11 is sent out by releasing the thread length adjusting mechanism 27, and the thread 11 having a predetermined length required for starting the embroidery operation is inserted into the needle 10.

As shown in FIG. 7, the thread length adjusting mechanism 27 protrudes a thread length adjusting piece 27c slidably operated by a solenoid (not shown) via a wire 27a and a lever 27b, thereby forming the thread 11 Is held for a predetermined length, and the thread length adjusting piece 27c
Is retracted so that the held yarn 11 is sent out.

In this case, the tip of the thread length adjusting piece 27c is
Is formed in a concave shape in order to make it easier to hold.

The thread delivery mechanism 28 provided on the outer peripheral surface of the semi-cylindrical body 24a of the thread adjustment mechanism 24 below the thread length adjustment mechanism 27
For smoothly sending out the yarn 11 toward 0, as shown in FIG. 8, the yarn 11 is connected to a yarn delivery pipe 28a for guiding the yarn 11 above the threading device 7, and a high-pressure air source (not shown). And an air nozzle 28b for sending out the yarn 11 to the threading device 7 by a high-pressure air flow.

In this case, the air nozzle 28b is positioned at the threading position,
That is, the thread delivery pipe 28a located above the threading device 7
Is fixed so that the opening end of the air nozzle 28b is located near the upper opening of the threading device 7, and the threading device 7 accurately clamps the thread 11 hanging from the thread delivery pipe 28a located above the threading device 7. In order to make it possible to tilt the thread delivery pipe 28a about the swing shaft 28d by the biasing force of the torsion spring 28c, except for the thread delivery pipe 28a located above the threading device 7, Thread delivery pipe 28a located above threading device 7
Of the torsion spring 28c against the posture holding piece 28e fixed to the sewing machine head 1 or operated by an appropriate drive mechanism (not shown).

The thread selection mechanism 29 is for selectively positioning the thread delivery pipe 28a of the thread delivery mechanism 28 corresponding to the required bobbin 21 above the threading device 7 for threading a predetermined needle 10.
A support shaft 29a provided on the sewing machine head 1 for swingably mounting the 24 via its bottom plate 24b, and a support shaft 29a by a link 29c connected to a drive source (not shown). The rocking body 29b, which is rocked and driven, and the bottom plate 2 of the thread adjusting mechanism 24
The pin 29d is fitted into the through hole 24c formed in the hole 4b, and is provided with a pin 29d projecting from the rocking body 29b for rocking and driving the thread adjusting mechanism 24 together with the rocking body 29b.

In this case, a threading device 7 for threading a thread delivery pipe 28a of a thread delivery mechanism 28 corresponding to a required bobbin 21 to a predetermined needle 10
The positioning roller 29h is attached to the tip of an oscillating body 29g that is oscillated by using a support shaft 29f as an oscillating axis by a link 29e connected to a driving source (not shown in the figure) in order to accurately position the oscillating member above the fin.
The positioning roller 29h is fitted to a gear 24d engraved on the periphery of the bottom plate 24b of the thread adjusting mechanism 24 in accordance with the angle of the thread sending pipe 28a of the thread sending mechanism 28.

In this case, the thread selection mechanism 29 is controlled by the control unit of the embroidery sewing machine, and the control unit previously stores the type (color) of each bobbin 21 stored in the bobbin storage unit 22 so that a large number of yarns are selected. To automatically select the color thread of

In addition, at an appropriate position on the outer peripheral surface of the semi-cylindrical body 24a of the yarn adjusting mechanism 24, a yarn insertion hole is formed at substantially equal intervals in order to hold the yarn 11 from each bobbin 21 so as not to be entangled. It is desirable to provide the holders 20a, 20b, 20c, 20d, 20e.

Further, the thread tooth force adjusting mechanism 25 and the thread feeding mechanism 28 constituting the thread adjusting mechanism 24 correspond to the number of the bobbins 21 that can be stored in the bobbin storing section 22, respectively, that is, 18 sets in the present embodiment. Is provided on the outer peripheral surface of the semi-cylindrical main body 24a of the yarn adjusting mechanism 24, but the yarn tension releasing mechanism 26,
Air nozzle 28b of yarn length adjusting mechanism 27 and yarn sending mechanism 28
And the attitude holding piece 28e is one on the sewing machine head 1 side.
Arranged individually, so that one of the 18 sets of mechanisms at a predetermined position is operated or cooperates with the one at a predetermined position,
That is, 18 sets of these mechanisms are shared.

Further, a bobbin storage section 22 and a thread adjusting mechanism 24 integrally provided therewith are unitized (hereinafter, referred to as a “unit”).
That. ) Is desirably prepared a plurality of times greater than the number of sewing heads 1. Thus, when the color thread is replaced, the unit can be replaced and the time required for the replacement of the color thread can be reduced. For example, if the number of units of the present embodiment is twice as many as the number of sewing heads, it is possible to exchange color threads of up to 36 colors in a short time. in this case,
The type (color) of each bobbin 21 stored in the bobbin storage unit 22 is stored in advance in the control unit of the embroidery sewing machine, so that a large number of color threads can be automatically changed simply by replacing the unit. be able to.

Further, in the present embodiment, the bobbin housing portion 22 and the thread adjusting mechanism 24 integrally provided with the bobbin housing portion 22 are configured as a unit, and this is detachably attached to the sewing head 1. It can also be fixedly attached to the sewing head 1.

Further, in this embodiment, since the thread delivery pipe 28a of the thread delivery mechanism 28 corresponding to the required bobbin 21 is selectively positioned above the threading device 7 for threading the predetermined needle 10, the thread selection The yarn adjusting mechanism 24 is swingably driven by the mechanism 29 with the support shaft 29a as the swing axis.
A mechanism that slides in a horizontal plane may be employed.

Next, a modified example of the first embodiment of the thread supply device 2 disposed above the sewing head 1 of the embroidery sewing machine will be described with reference to FIGS.
Shown in the figure.

The yarn supply device 2 includes a bobbin storage portion 22 that can store a plurality of bobbins 21 of color yarns, and a yarn that is provided integrally with the bobbin storage portion 22 and that is provided in correspondence with the number of bobbins 21 that can be stored. A semi-cylindrical body having a tension adjusting mechanism 25, a yarn length adjusting mechanism (not shown; see the first embodiment described above) for holding the yarn 11 to be sent out toward the needle 10 by a predetermined length, and a yarn sending mechanism 28.
A thread adjusting mechanism 24 having a thread 24a and a thread selecting mechanism 29 for selectively positioning a thread feeding mechanism 28 corresponding to a required bobbin 21 above a threading device 7 for threading a predetermined needle 10.

In the present embodiment, the bobbin storage portion 22 and the upper half portion of the yarn adjustment mechanism 24 provided integrally therewith, that is, the thread tension adjustment mechanisms 25 provided corresponding to the number of bobbins 21 that can be stored. As shown in detail in FIGS. 9 and 12, this is divided into two parts on the left and right sides to form a unit (hereinafter, referred to as “units 2A and 2B”), which is disposed on the sewing machine head 1. Through the bottom plate 24b of the thread adjusting mechanism 24
It is designed to be removable.

The bobbin storage unit 22 is configured to store a total of 18 bobbins 21, for example, nine in the left and right directions, each of which is inclined slightly upward in the upper row.
The spindle 22a for inserting and supporting
A bobbin guide 22b suitable for the bobbin 21 to be used is arranged around the spindle 22a, and a felt 22c for pulling out the thread 11 of each bobbin 21 so as not to be entangled is laid on the bottom surface.

A thread holding member 23 is provided on the spindle 22a, and a total of 18 yarns 11 are pulled out from the thread holding member 23 at an interval, and a thread tension adjusting mechanism of a thread adjusting mechanism 24 integrally attached to a lower portion of the bobbin housing 22. Send it to 25.

The thread holder 23 includes a guide plate 23p disposed at the upper end of the spindle 22a, a ceramic guide tube 23q disposed at the upper end opening of the spindle 22a, a hollow conduit 23r of the spindle 22a, and a hollow. And a pipe member 23s communicating with the pipe 23r, and the thread 11 of each bobbin 21 is supplied to the thread tension adjusting mechanism 25 through the hollow pipe 23r of the spindle 22a and the pipe member 23s.
To be sent to

In this case, by changing the amount of protrusion of the distal end of the pipe member 23s between the adjacent pipe members 23s, it is possible to easily hold the yarn 11 derived from the pipe member 23s.

The operation of inserting the yarn 11 into the hollow conduit 23r and the pipe member 23s of the spindle 22a can be easily performed by blowing a high-pressure airflow together with the yarn 11 from the upper end opening of the guide tube 23q.

The thread tension adjusting mechanism 25 has three thread tension adjusting members 25a, 25b, and 25c provided on the outer peripheral surface of the semi-cylindrical body 24a of the thread adjusting mechanism 24 for each thread 11 from each bobbin 21.

One of the yarn tension adjusting members 25c is provided with a tension sensor 25d for measuring the tension of the yarn 11, so that the yarn 11 can be detected as a broken yarn.

The signal from the tension sensor 25d is embroidered as an electric signal from an electric contact (not shown) provided on the thread adjusting mechanism 24 via an electric circuit (not shown) provided with an electric contact provided on the sewing machine head 1. Sent to the control unit of the sewing machine for
In addition to controlling the driving of the embroidery sewing machine, a display lamp (not shown) for displaying the state of the upper thread and the lower thread disposed on the sewing machine head 1 and the like is turned on to notify the operator of the breakage of the thread 11. To

In addition to the display lamp, a display device such as a liquid crystal display panel for displaying the state of the embroidery sewing machine to an operator and an alarm device such as a buzzer can be provided at an appropriate position of the embroidery sewing machine.

In order to prevent a large resistance from being applied to the yarn 11 when sending the yarn 11 toward the needle 10, a yarn tension adjusting member is provided.
A thread tension release mechanism (not shown; see the above-described first embodiment) for releasing the holding of the thread 11 by 25b is provided.

The thread sending mechanism 28 provided on the outer peripheral surface of the semi-cylindrical bottom plate 24b of the thread adjusting mechanism 24 is for smoothly sending out the thread 11 toward the needle 10, and places the thread 11 above the threading device 7. A yarn delivery pipe 28a for guiding and an air nozzle (not shown; see the first embodiment) connected to a high-pressure air source (not shown) for sending the yarn 11 toward the threading device 7 by a high-pressure air flow. Have.

The air nozzle is fixed so that the opening end of the air nozzle is located near the threading position, that is, near the upper opening of the thread delivery pipe 28a located above the threading device 7, as in the first embodiment. Further, it can be configured to be tilted except for the thread delivery pipe 28a above the threading device 7 and at the position where embroidery is performed.

In this case, at least the thread delivery pipe 28a at the position where the embroidery is performed is made to rise by operating by an appropriate driving mechanism (not shown), and is tilted immediately after the embroidery is completed. It is desirable that the threading device 7 can accurately pinch the thread 11 hanging from the thread delivery pipe 28a located above the thread delivery pipe 28a.

The thread selection mechanism 29 is for selectively positioning the thread delivery pipe 28a of the thread delivery mechanism 28 corresponding to the required bobbin 21 above the threading device 7 for threading a predetermined needle 10.
A support shaft 29a provided on the sewing machine head 1 for swingably mounting the 24 via its bottom plate 24b, and a support shaft 29a by a link 29c connected to a drive source (not shown). And a bottom plate 2 of the thread adjusting mechanism 24.
The pin 29d is fitted into the through hole 24c formed in the hole 4b, and is provided with a pin 29d projecting from the rocking body 29b for rocking and driving the thread adjusting mechanism 24 together with the rocking body 29b.

In this case, a threading device 7 for threading a thread delivery pipe 28a of a thread delivery mechanism 28 corresponding to a required bobbin 21 to a predetermined needle 10
Drive source (not shown) to accurately position above
A positioning roller 29h is arranged at the tip of a rocking body 29g that is rocked by using a support shaft 29f as a rocking axis by a link 29e connected to the bottom plate 2 of the thread adjusting mechanism 24.
The outer periphery of 4b is fitted with a gear 24d cut in accordance with the angle of the thread delivery tube 28a of the thread delivery mechanism 28.

In this case, the thread selection mechanism 29 is controlled by the control unit of the embroidery sewing machine, and the control unit previously stores the type (color) of each bobbin 21 stored in the bobbin storage unit 22 so that a large number of yarns are selected. To automatically select the color thread of

In addition, at an appropriate position on the outer peripheral surface of the semi-cylindrical body 24a of the yarn adjusting mechanism 24, a yarn insertion hole is formed at substantially equal intervals in order to hold the yarn 11 from each bobbin 21 so as not to be entangled. It is desirable to provide the holders 20a, 20b, 20c, 20d.

Further, the thread tension adjusting mechanism 25 and the thread sending mechanism 28 constituting the thread adjusting mechanism 24 each correspond to the number of the bobbins 21 that can be stored in the bobbin storing section 22, that is, in this embodiment, 18 sets are provided. Are provided on the outer peripheral surfaces of the semi-cylindrical main body 24a and the bottom plate 24b of the yarn adjusting mechanism 24, respectively, but the yarn tension releasing mechanism, the yarn length adjusting mechanism, and the yarn sending mechanism 28 are provided.
Air nozzles 28b, etc.
Arranged individually, so that one of the 18 sets of mechanisms at a predetermined position is operated or cooperates with the one at a predetermined position,
That is, 18 sets of these mechanisms are shared.

Also, units 2A and 2B are configured such that the bobbin storage unit 22 and the yarn adjustment mechanism 24 integrally provided therewith are bisected to the left and right.
Is desirably prepared a plurality of times the number of sewing heads 1. Thereby, when exchanging the color thread, it is possible to reduce the time required for exchanging the color thread by exchanging the unit 2A or the unit 2B together. For example, if the units 2A and 2B of the present embodiment are prepared twice as many as the number of sewing heads, it is possible to exchange color threads of up to 36 colors in a short time. In this case, the control unit of the embroidery
By storing the types (colors) of the respective bobbins 21 stored in advance in advance, it is possible to automatically exchange a large number of color threads simply by exchanging the units.

Further, in the present embodiment, the bobbin housing portion 22 and the thread adjusting mechanism 24 integrally provided with the bobbin housing portion 22 are configured as a unit, and this is detachably attached to the sewing head 1. It can also be fixedly attached to the sewing head 1.

Further, in this embodiment, since the thread delivery pipe 28a of the thread delivery mechanism 28 corresponding to the required bobbin 21 is selectively positioned above the threading device 7 for threading the predetermined needle 10, the thread selection The yarn adjusting mechanism 24 is swingably driven by the mechanism 29 with the support shaft 29a as the swing axis.
A mechanism that slides in a horizontal plane may be employed.

At the lower part of the thread supply device 2 of the sewing head 1, FIGS.
As shown in FIG. 24, a threading device 7 including a thread tensioning mechanism 3 and a threading mechanism 6 is provided.

As shown in FIGS. 14 to 17, the yarn tensioning mechanism 3 guides the end of the yarn 11 suspended by a predetermined length from the yarn delivery pipe 28 of the yarn supply device 2 to a position near the needle 10. , A thread clamping member 31,
A lever 32 having a thread clamping member 31 disposed at a distal end thereof; a sliding piece 33 for swingably supporting a base end of the lever 32; and a thread tensioning mechanism main body
The guide tube 34 of the sliding piece 33 disposed substantially vertically in the 30; the belt 35 for moving the sliding piece 33 up and down along the guide pipe 34; and the pinion 32a fixed to the base end of the lever 32 Lever 3
The rack 36 disposed near the lowering position of the sliding piece 33 that regulates the swing angle of 2, and the roller disposed at the intermediate position of the lever 32
A guide groove 37 formed substantially vertically in the thread tensioning mechanism main body 30 for inserting the 32b and restricting the swing angle of the lever 32, and a belt
And a drive mechanism 38 that drives 35.

As described above, the thread tensioning mechanism 3 is constituted by the swinging lever 32, the sliding piece 33 that moves up and down, and the like.
Can be made compact, and in particular, the amount of protrusion of the thread holding member 31 forward of the sewing machine head 1 can be reduced.

The yarn tensioning mechanism 3 drives the belt 35 to move the yarn holding member 31 from the standby position substantially at the intermediate portion to the yarn delivery pipe.
The thread holding member 31 protrudes from the sewing machine head 1 so that the thread holding member 31 can automatically hold the end of the thread 11 when the thread 11 is moved to the highest position for holding the end of the thread 11 hanging from 28a. A shoe member 31e is swingably disposed on the bracket 1b thus set, and the shoe member 31e is provided with a movable holding piece 31a of the thread holding member 31.
The roller 31f disposed at the tip of the operation piece 31d protruding from the abutment contacts the roller 31f to open the movable holding piece 31a against the urging force of the spring member 31c, so that the movable holding piece 31a and the fixed holding piece 31b After the end of the thread 11 hung down from the thread delivery pipe 28a is inserted, the shoe member 31e is swung by a drive mechanism (not shown) to release the contact between the shoe member 31e and the operation piece 31d. hand,
The movable holding piece 31a is returned, and the movable holding piece 31a and the fixed holding piece 31a are returned.
The thread 11 inserted between the thread 11b and the thread 31b is sandwiched.

Then, by driving the belt 35 in this state,
The thread holding member 31 is moved from the highest position to the lowest position, and the thread 11 guided to a position near the needle 10 is inserted into the needle hole 10a of the needle 10.
After the threading is performed, the operation member 31g is swingably mounted on the lower portion of the thread tensioning mechanism main body 30 so that the end of the thread 11 held by the thread clamping member 31 can be released. The operating member 31g presses a roller 31f disposed at the tip of an operating piece 31d protruding from the movable holding piece 31a of the thread holding member 31 to attach the movable holding piece 31a to the spring member 31c. It is configured to open against the power.

The drive mechanism 38 is configured to be able to selectively drive the rotating shaft 38a of the belt 35 in both the forward and reverse directions by a motor (not shown).

In addition, the thread tensioning mechanism 3 has an appropriate position in the elevating path of the sliding piece 33, for example, a standby position near the intermediate position of the thread clamping member 31, and the thread 11 having the thread clamping member 31 suspended from the thread delivery pipe 28a. A limit switch (not shown) is disposed at the highest position for holding the end of the moving member and the lowest position for performing the threading.
To detect the position of. Note that the arrangement position of the limit switch can be appropriately adjusted.

The yarn feeding pipe 28a of the yarn supply device 2 and the needle 1 are moved by the yarn tensioning mechanism 3.
The thread 11 stretched between the position near 0 and FIG.
As shown in the figure, the balance is mounted on the balance 41 and the sub balance 42 of the balance mechanism 4.

In this embodiment, three sets of the balance mechanism 4 and the needles 10 corresponding to the balance mechanism 4 are arranged, and the frame 1c provided with the needles 10 is configured to swing in a horizontal plane. However, the number of sets of needles 10 provided on the frame 1c may be increased or decreased, or the frame 1c may be configured to slide in a horizontal plane.

The balance 41 is formed with a thread hooking hole 41a at the distal end and a cutout portion 41b at the base end into which the drive pin 41c of the balance 41 is inserted.

The sub balance 42 has a ring-shaped thread hooking hole 42a and a
A lever 42b having a distal end 2a, a sliding piece 42c slidably supporting the lever 42b, and a guide pipe 42d of a sliding piece 42c disposed substantially vertically in the thread tensioning mechanism main body 30, A magnet piece 42e for adsorbing the sliding piece 42c to the thread holding member 31 of the thread tensioning mechanism 3 and moving the sliding piece 42c up and down along the guide tube 34 in accordance with the elevation of the thread holding member 31, and a second end of the lever 42b. A shoe member 42g that contacts the provided roller 42f to regulate the position of the threading hole 42a,
A roller 42f disposed at the other end of the lever 42b is a shoe member 42g.
And a spring member 42h that urges to contact with the spring member 42h.

The sub balance 42 of the balance mechanism 4 is a belt of the thread tensioning mechanism 3.
By driving the 35, the yarn holding member 31 is moved from the substantially middle standby position to the highest position for holding the end of the yarn 11 hanging down from the yarn sending pipe 28a, and the yarn holding member 31 is attracted to the yarn holding member 31. The sliding piece 42c also moves to the highest position, and the threading hole 4
The end of the thread 11 hanging from the thread delivery pipe 28a is inserted into 2a.

Then, the yarn holding member 31 located immediately below the yarn hooking hole 42a
The yarn 11 is pinched by the
When the 35 is driven, the thread holding member 31 moves from the highest position to the lowest position. At this time, the sliding piece 42c is also attracted to the thread holding member 31 and descends, but the sliding piece 42c is prevented from further descending by the stopper member 42i provided at a substantially intermediate position. The suction with 31 is released and stops at this position, that is, the standby position of the dead center. Also,
As the sliding piece 42c descends, the lever 42b disposed at the tip of the thread hooking hole 42a into which the thread 11 is inserted is brought into contact with the roller 42f disposed at the other end by contacting the shoe member 42g. Against the urging force of the spring member 42h, it slides in the horizontal direction according to the shape of the shoe member 42g.
The thread 11 is threaded through a thread hooking hole 41a formed at the tip of the balance 41 while the thread falls.

The thread 11 passed through the thread hole 41a of the balance 41 is
However, it is desirable to form a trap or the like so as not to slip out.

As a result, the thread 11 is hooked on the thread hooking hole 41a of the balance 41 and the thread hooking hole 42a of the sub-balance 42, and embroidery is performed while being held in a required zigzag shape.

At the time of embroidery, the balance 41 is reciprocated by the same drive mechanism as the conventional embroidery sewing machine, while the sub balance 42 is held at the standby position at the bottom dead center.

As shown in FIGS. 18 to 21, the threading mechanism 6 pulls the thread 11 guided to a position near the needle 10 by the thread tensioning mechanism 3,
To the needle hole 10a for threading
1, the drive mechanism 62 of the yarn pull-out mechanism 61, and the yarn tensioning mechanism 3
The yarn 11 clamped by the yarn clamping member 31 of FIG.
An air nozzle 63 arranged on the yarn holding member 31 for feeding the yarn 11 to the yarn pulling mechanism 61, and a pulling mechanism 61 for securely holding the yarn 11 inserted through the yarn pulling mechanism 61 by the yarn pulling mechanism 61.
And a thread pressing mechanism 64 disposed in the first position.

As shown in detail in FIGS. 19 to 21, the thread pulling-out mechanism 61 has a hook member 61a having a hook-shaped tip and guide members provided on both sides of the hook member 61a via spacers 61f, 61f. 61b, 61b, and a holding member 6 for holding a tip member including a hook member 61a, guide members 61b, 61b, and spacers 61f, 61f.
Consists of 1g.

The guide members 61b, 61b, at the base of the tips 61e, 61e, which are curved outward, so as to guide the hook member 61a to the center of the needle 10, that is, the position of the needle hole 10a when the guide member 61b contacts the needle 10. The hook member 61a is constituted by a leaf spring formed in a shape to be in contact with a side surface thereof, and has a thread insertion hole 61 substantially at its center.
c is formed, and further, a yarn escape groove 61d is formed from the yarn insertion hole 61c toward the tip.

As shown in detail in FIG. 18, the drive mechanism 62 of the thread pull-out mechanism 61 includes a frame disposed on a support 1d erected on the side of the sewing machine head 1 that supports a holding member 61g of the thread pull-out mechanism 61.
62a, a drive lever 62b for driving the holding member 61g, and a drive mechanism 62c for the drive lever 62b.

The thread pressing mechanism 64 includes a thread pressing piece 64a that is swingably disposed via a shaft 64c on the thread pulling mechanism 61 disposed on the holding member 61g.
In the direction of blocking the thread insertion hole 61c, that is, the guide member 6
Thread pressing piece 64a in the direction of pressing down thread 11 along the side of 1b
And a frame 62a of the thread pressing piece 64a and the driving mechanism 62 for pushing up the thread pressing piece 64a against the urging force of the torsion spring 64b to hold the thread insertion hole 61c in an open state.
And operation pieces 64d and 64e of the thread pressing piece 64a formed respectively.

Then, as shown in FIG. 18 (a), the threading mechanism 6 pushes the distal end of the driving lever 62b forward by the driving mechanism 62c, thereby forming a long hole formed on the base end side of the driving lever 62b. By pushing down the pin 61h fixed to the holding member 61g inserted in the hole 62d and lowering the pin 61h along the groove 62e formed in the frame 62a, the pulling-out mechanism 61 is moved through the holding member 61g fixing the pin 61h. Let go down.

In this state, the drive mechanism 62c further pushes the distal end of the drive lever 62b forward, whereby the pivot 62g of the drive lever 62b is advanced along the groove 62e formed in the frame 62a, and the base end of the drive lever 62b The pin 61h fixed to the holding member 61g inserted in the long hole 62d formed on the side is advanced along the groove 62h formed in the frame 62a, so that the pull-out mechanism 61 is fixed via the holding member 61g fixing the pin 61h. To move forward.

As described above, the drive mechanism 62 drives the drive lever 62b by the drive mechanism 62c to lower and advance the thread pull-out mechanism 61, and guides the distal end of the hook member 61a through the needle hole while guiding the thread pullout mechanism 61 with the guide member 61b. Insert through 10a.

By the way, when the yarn pulling mechanism 61 is lowered and advanced,
The operating pieces 64d and 64e of the thread pressing piece 64a formed on the thread pressing piece 64a and the frame 62a of the drive mechanism 62 abut against each other, and push up the thread pressing piece 64a against the urging force of the torsion spring 64b to thereby insert the thread insertion hole. 61c can be kept open.

In this state, the yarn 11 held by the yarn holding member 31 of the yarn tensioning mechanism 3 is supplied to the air nozzle provided on the yarn holding member 31.
By sending high-pressure air from 63 toward the yarn pulling-out mechanism 61, the high-pressure air is inserted into the yarn insertion hole 61c of the guide member 61b, and the end of the yarn 11 held by the yarn holding member 31 is released.

Thereafter, the drive lever 62b is driven by the drive mechanism 62c to move the thread pulling mechanism 61 backward, and the thread presser
The contact between the operation pieces 64d and 64e of the thread pressing piece 64a formed on the frame 62a of the drive mechanism 62 and the thread pressing piece 64a is released, and the thread pressing piece 64a is swung in a direction to shield the thread insertion hole 61c, and the thread is released. By pushing down both ends of the yarn 11 inserted through the insertion hole 61c along the side surface of the guide member 61b, the yarn 1 inserted through the yarn insertion hole 61c
The drive operation of the drive lever 62b of the drive mechanism 62 is continued while the hook 1 is accurately hooked on the hook member 61a of the thread pull-out mechanism 61. Thus, the thread pulling-out mechanism 61 is retracted, and the threading is performed by pulling out the hook member 61a from the needle hole 10a while hooking the thread 11 on the hook member 61a having a hook-shaped tip.

By the way, in the embroidery sewing machine according to the present embodiment, the thread 11 is hooked by driving the thread selection mechanism 29 of the thread supply device 2 as shown in FIGS. 14 to 15 after threading. The thread delivery pipe 28a is moved to the side by one step (to the right) in the handed state to perform embroidery.

An auxiliary mechanism 5 including an upper thread clamp mechanism 51, a thread cutting mechanism 52, and a cut thread recovery mechanism 53 is provided on the path around which the thread 11 is looped.

The upper thread clamp mechanism 51 is for temporarily clamping the thread 11 in order to prevent a new thread 11 from being unreeled from the bobbin 21 when cutting and collecting the thread 11.
As shown in FIG. 14, a fixed holding piece 51a fixed to the sewing machine head 1 side, a movable holding piece 51b for clamping the thread 11 between the fixed holding piece 51a, and a driving mechanism 51c for the movable holding piece 51b. It is composed of

The thread cutting mechanism 52 is for cutting the thread 11 when exchanging the thread 11 or the like. As shown in FIG. 22, the thread cutting mechanism 52 includes a fixed blade 52a fixed to the sewing machine head 1 side and a pivot 52b. The movable blade 52c includes a swinging movable blade 52c and a driving mechanism 52d for the movable blade 52c.

The cut thread collecting mechanism 53 is for collecting the thread 11 cut by the thread cutting mechanism 52 when exchanging the thread 11, etc.
As shown in FIG. 23, a hook 53b for hooking the thread 11 at the tip end
An operating rod 53c forming a driving mechanism 53d of the operating rod 53c,
The operation rod 53c is slidably inserted, and the suction pipe 53e that draws and collects the cut thread 11; and the introduction pipes 53f and 53g of high-pressure air for generating a suction force in the suction pipe 53e.
The collected thread 1 detachably disposed on the collection mechanism main body 53a.
And a collection container 53h formed of a net for storing 1.

The sewing head 1 is provided with a cover body 8 as shown in FIG.

The cover body 8 is provided with a thread delivery pipe in a state where the thread 11 is stretched.
A lower thread clamp mechanism 81 for clamping the thread 11 and a sensor 82 for detecting the state of the thread 11 are provided on the path where the thread 11 is stretched when the thread 28a is moved to the embroidery position one side (right side). I do.

The lower thread clamp mechanism 81 prevents unwinding of the thread 11 below the lower thread clamp mechanism 81 when starting embroidery,
This is for temporarily clamping the thread 11 to prevent the end of the thread 11 from coming out of the surface of the embroidery cloth, and includes a fixed holding piece 81a fixed to the sewing machine head 1 side and a fixed holding piece 81a. The movable holding piece 81b for clamping the yarn 11 between the movable holding piece 81 and the movable holding piece 8
1b.

The sensor 82 that detects the state of the thread 11 optically detects the return of the twist of the thread 11, stops the embroidery when the return of the twist of the thread 11 occurs, replaces the thread 11, and removes the defective product. As shown in FIG. 24, the light emitting / receiving element 82a includes a light emitting / receiving element 82a and a mirror 82b opposed to the light emitting / receiving element 82a with the thread 11 interposed therebetween.

FIGS. 25 to 32 show a second embodiment of the thread supply device 2 disposed above the sewing machine head 1 of the embroidery sewing machine.

The yarn supply device 2 includes a bobbin storage portion 22 that can store a plurality of bobbins 21 of color yarns, and a yarn that is provided integrally with the bobbin storage portion 22 and that is provided corresponding to the number of bobbins 21 that can be stored. A tension adjusting mechanism 25, a yarn adjusting mechanism 24 having a flat rectangular main body 24a having a yarn length adjusting mechanism 27 for holding the yarn 11 to be sent out toward the needle 10 by a predetermined length, and a yarn sending mechanism 28; A thread selection mechanism 29 for selectively positioning a thread delivery mechanism 28 corresponding to the bobbin 21 above a threading device 7 for threading a predetermined needle 10.

In this case, the number of the bobbins 21 that can be stored in the bobbin storage unit 22 and the number of the thread tension adjustment mechanisms 25 do not necessarily have to match, and the number of the bobbin storage units 22 can be larger than the number of the thread tension adjustment mechanisms 25. The number of the bobbins 21 can be increased, and the bobbin 21 for hanging the yarn on the yarn tension adjusting mechanism 25 can be changed.

The bobbin storage section 22 stores, for example, a total of 28 bobbins 21 of 4 × 7. In the bobbin storage section 22, a spindle 22a for inserting and supporting the bobbin 21 is provided, Bobbin 21 used around 22a
A bobbin guide (not shown) adapted to the above is provided, and a felt 22c for pulling out the thread 11 of each bobbin 21 so as not to be entangled is laid on the bottom surface.

A thread holding body 23 is provided on the spindle 22a, and a total of 28 yarns 11 are drawn out from the thread holding body 23 at intervals, and a thread tension adjusting mechanism of a thread adjusting mechanism 24 integrally attached to a lower portion of the bobbin housing 22. Send it to 25.

In addition, eight of the total of 28 yarns 11 are held by the yarn holding body 23.

A yarn guide 23 is provided with a ceramic guide tube (not shown) disposed at the upper end opening of the spindle 22a,
22a hollow pipe and pipe member 23s communicating with the hollow pipe
And a guide pipe 23t made of ceramic disposed at the opening at the tip end of the pipe member 23s, and the yarn 11 of each bobbin 21 can be adjusted through the hollow conduit of the spindle 22a and the pipe member 23s. Send it to 25.

The operation of inserting the yarn 11 into the hollow conduit of the spindle 22a and the pipe member 23s is performed by opening the yarn from the upper end opening of the guide tube 23q.
This can be easily performed by blowing a high-pressure air flow together with the eleventh embodiment.

By the way, in the present embodiment, the bobbin storage section 22 is fixedly disposed on the sewing machine head 1, but the present invention is not limited to this. The storage section 22 can be divided into two parts on the left and right sides to form a unit, and this can be detachably attached to the upper part of the flat rectangular main body 24a of the thread adjustment mechanism 24.

The bobbin storage section 22 stores, for example, a total of 20 bobbins 21 on the left and right, each of which is 2 × 5, ie, a total of 20 pieces. The bobbin storage section 22 has a spindle for inserting and supporting the bobbin 21. Along with erecting the 22a, a bobbin guide (not shown) adapted to the bobbin 21 to be used is arranged around the spindle 22a, and a felt 22c for pulling out the thread 11 of each bobbin 21 so as not to be entangled on the bottom surface. I do.

Then, the storage table 22d on which the spindle 22a is erected is detachably mounted by sliding on a guide rail 22i formed on the upper part of the main body 24a of the thread adjusting mechanism 24.

In this case, the pipe member holding member 23u in which the distal end opening of the pipe member 23s communicating with the hollow conduit of the spindle 22a is fixed, the storage member 22d is detached from the storage member 22d.
d so that it can be selectively arranged on the support shaft 22f erected above the main body 24a of the thread adjusting mechanism 24 when the storage table 22d is mounted. I do.

Further, in front of the guide rail 22i, when the storage base 22d is mounted on the guide rail 22i, the storage base 22d can be temporarily placed and the storage base 22d can be smoothly slid along the guide rail 22i. A pipe member support frame 22h for slidably disposing a pipe member 23s for supporting the pipe member 23s, adjusting the hanging amount of the pipe member 23s, and preventing entanglement while fixing the storage table support 22d for I do.

Further, the storage table 22d of the bobbin storage section 22 is preferably
A plurality of the number of sewing heads 1 is prepared. Thus, when the color thread is replaced, the entire storage table 22d is replaced, and the time required for the color thread replacement can be reduced.
For example, if the number of storage stands 22d of the bobbin storage section 22 of the present modified example is twice as many as the number of sewing machine heads, it is possible to exchange color threads of up to 40 colors in a short time. In this case, the type (color) of each bobbin 21 stored in the storage table 22d of the bobbin storage unit 22 is stored in the control unit of the embroidery sewing machine in advance, so that a large number of storages can be performed simply by replacing the storage table 22d. The color thread can be changed automatically.

In this modification, the storage table 22d is connected to the thread adjusting mechanism 2
4 is mounted detachably by sliding on a guide rail 22i formed on the upper part of the main body 24a.However, the storage table 22d is mounted on the upper part of the main body 24a of the thread adjusting mechanism 24 to be removably mounted. You can also

Also, the number of divisions of the bobbin storage section 22 is not limited to two, but may be three or more.

By the way, in the second embodiment, the yarn tension adjusting mechanism
25 has two thread tension adjusting members 25b and 25c provided for each thread 11 from each bobbin 21 provided on the outer surface of the plane rectangular main body 24a of the thread adjusting mechanism 24.

One of the yarn tension adjusting members 25c is provided with a tension sensor 25d for measuring the tension of the yarn 11, so that the yarn 11 can be detected as a broken yarn.

The signal from the tension sensor 25d is converted into an electric signal from an electric contact 25e provided on the thread adjusting mechanism 24 via an electric circuit 25g provided with an electric contact 25f provided on the sewing machine head 1 by a control unit of the embroidery sewing machine. To control the driving of the embroidery sewing machine, and to turn on a display lamp (not shown) for displaying the state of the upper thread and the lower thread disposed on the sewing machine head 1 and the like, thereby giving the operator a thread 11 for the thread. Let them know when they are cut.

In addition to the display lamp, a display device such as a liquid crystal display panel for displaying the state of the embroidery sewing machine to an operator and an alarm device such as a buzzer can be provided at an appropriate position of the embroidery sewing machine.

In order to prevent a large resistance from being applied to the yarn 11 when sending the yarn 11 toward the needle 10, a yarn tension adjusting member is provided.
A thread tension releasing mechanism 26 for releasing the holding of the thread 11 by the thread 25b is provided (for details, refer to the thread tension releasing mechanism 26 of the first embodiment).

A thread tension adjusting tool 25 for adjusting the magnitude of the tension of the thread 11 applied by the two thread tension adjusting members 25b and 25c is provided on the sewing head 1 near the main body 24a of the thread adjusting mechanism 24.
h should be installed.

The thread tension adjuster 25h can apply a tension equivalent to the tension applied to the thread 11 via a balance 41, a sub-balance 42, a needle 10 and the like located below the thread supply device 2 described later. Accordingly, the magnitude of the tension of the thread 11 from each bobbin 21 applied by the two thread tension adjusting members 25b and 25c can be adjusted without hanging the thread 11 between the balance 41, the sub-balance 42, the needle 10, and the like. Be able to adjust uniformly. The thread tension adjuster 25h is provided for disposing the magnet at the base to feed the thread 11 from each bobbin 21 toward an appropriate position of the sewing machine head 1, more specifically, the needle 10. Thread sending mechanism
It can be selectively and detachably installed at a position below the thread delivery pipe 28a of the 28.

A thread sending mechanism 28 provided on the outer surface of the flat rectangular main body 24a of the thread adjusting mechanism 24 is for smoothly sending the thread 11 toward the needle 28, and guides the thread 11 above the threading device 7. It has a thread delivery pipe 28a, a high pressure air supply pipe 28f connected to a high air pressure source (not shown), and an air nozzle 28b for delivering the thread 11 toward the threading device 7 by a high pressure air flow.

The air nozzle 28b is fixed so that the opening end of the air nozzle 28b is located near the upper opening of the thread delivery pipe 28a, and the air of the thread delivery pipe 28a is located above the threading device 7 and at the position where embroidery is performed. The high-pressure air supply pipe 28f is slidably provided so that high-pressure air can be supplied to the nozzle 28b from the high-pressure air supply pipe 28f.

The high-pressure air supply pipe 28f and the air nozzle 28b are configured such that the high-pressure air supply pipe 28f and the air nozzle 28b are inserted by sliding the high-pressure air supply pipe 28f as shown in this embodiment. In addition, the high-pressure air supply pipe 28f and the air nozzle 28b can be configured to be hermetically connected by a seal member provided at the open ends of the high-pressure air supply pipe 28f and the air nozzle 28b.

The thread selection mechanism 29 is for selectively positioning the thread delivery pipe 28a of the thread delivery mechanism 28 corresponding to the required bobbin 21 above the threading device 7 for threading a predetermined needle 10.
24 together with the bobbin storage section 22 is slidably mounted on a sliding shaft 29i disposed on the sewing machine head 1 in a horizontal plane, and a main body 24a of the adjacent thread adjusting mechanism 24 is connected to a connecting member 24c.
And a sliding shaft 29a by a driving source (not shown).
A threading device that slides the main bodies 24a of all the thread adjusting mechanisms 24 in conjunction with each other to thread the thread delivery pipe 28a of the thread delivery mechanism 28 corresponding to the required bobbin 21 to a predetermined needle 10. 7 so that it can be accurately positioned above.

In this case, the thread selection mechanism 29 is controlled by the control unit of the embroidery sewing machine, and the control unit previously stores the type (color) of each bobbin 21 stored in the bobbin storage unit 22 so that a large number of yarns are selected. To automatically select the color thread of

The configuration of the thread length adjusting mechanism 27 and the like provided below the thread tension adjusting mechanism 25 is the same as in the first embodiment.

Next, the thread supply device 2 of the sewing head 1 of the embroidery sewing machine
FIGS. 33 to 40 show a second embodiment of the threading device 7 including the thread tensioning mechanism 3 and the threading mechanism 6 disposed at the lower part of the threading device.

As shown in FIGS. 33 to 34, the yarn tensioning mechanism 3 guides 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. , Thread clamping member 31
A lever 32 having a thread clamping member 31 disposed at the end thereof;
A sliding piece 33 for supporting the base end of 32, a belt 35 for raising and lowering the sliding piece 33, and a roller 32b disposed at an intermediate position of the lever 32
And a guide groove 37 formed in a substantially vertical direction in the thread tensioning mechanism main body 30 for restricting the swing angle of the lever 32, and a driving device 38 for driving the belt 35.

By configuring the thread tensioning mechanism 3 with the lever 32, the sliding piece 33 that moves up and down, and the like, the thread tensioning mechanism 3 can be made compact. In particular, the sewing head 1 of the thread pinching member 31 can be used. Can be reduced in the forward projection amount.

By driving the belt 35, the thread tensioning mechanism 3 moves the thread clamping member 31 from a substantially intermediate standby position (position of the sliding piece 33 to the position sensor 39c) to an open position (sliding position) of the thread clamping member 31. When moving the moving piece 33 through the position sensor 39b) to the highest position (the sliding piece 33 is at the position of the position sensor 39a) for holding the end of the thread 11 hung down from the yarn sending pipe 28a. In order that the thread holding member 31 can automatically hold the end of the thread 11, a shoe member is swingably disposed on a bracket protruding from the sewing machine head, and the shoe holding member 31 is attached to the shoe member. The roller 31f disposed at the tip of the operating piece protruding from the movable holding piece contacts the movable holding piece 31a to open the movable holding piece 31a against the urging force of the spring member, so that the movable holding piece 31a and the fixed holding piece The yarn 11 suspended from the yarn delivery tube 28a between the yarn 11 and the yarn 11b.
The end of the thread, the shoe member is swung by the drive mechanism, the contact between the shoe member and the operation piece is released, the movable holding piece 31a is returned, and the movable holding piece 31a and the fixed holding piece 31b The yarn 11 inserted between them is clamped (similar to the first embodiment).

Then, by driving the belt 35 in this state,
Move the thread holding member 31 to the highest position (the sliding piece 33 is
a) to the lowest position (the position of the sliding piece 33 at the position sensor 39d), and the yarn 11 guided to a position near the needle 10
After the thread is guided through the needle hole 10a of the needle 10 and threaded, the end of the thread 11 held by the thread clamping member 31 is released so that the end of the thread tension mechanism main body 30 can be released. An operating member is movably disposed, and the operating member presses a roller 31f disposed at a tip of the operating piece protruding from the movable holding piece 31a of the thread holding member 31, thereby causing the movable holding piece 31a to be spring-loaded. It is configured to open against the urging force of the member (similar to the first embodiment).

The drive mechanism 38 is configured to be able to selectively drive the rotating shaft 38a of the belt 35 in both the forward and reverse directions by a motor (not shown).

Further, the arrangement positions of the position sensors 39, 39b, 39c, 39d can be appropriately adjusted.

As a mechanism for supplying high-pressure air to the air nozzle 63 disposed on the yarn holding member 31, the air nozzle 63 is directly connected to a high-pressure air source (not shown) via a high-pressure air supply pipe. When the holding member 31 moves to the lowest position (the sliding piece 33 is at the position of the position sensor 39d), the air nozzle 63 and the high-pressure air supply provided on the fixed side are configured to be inserted. As shown in the figure, the air nozzle 63 and a sealing member disposed at the open end of the high-pressure air supply pipe 63a,
The air nozzle 63 and the high-pressure air supply pipe 63a can be configured to be connected in a sealed manner.

By the way, in the present embodiment, the opening and closing operation of the thread holding member 31 of the thread tensioning mechanism 3 is performed by the shoe member and the operating member disposed at the upper and lower parts of the thread tensioning mechanism main body 30. The present invention is not limited to this, and as in the modification shown in FIGS. 35 to 36, a torsion spring 31j for urging the thread holding member 31 in the closing direction is provided between the movable holding piece 31a and the fixed holding piece 31b. The yarn holding member 31 may be configured so that the opening / closing operation of the yarn holding member 31 is performed by an appropriate operation member 31h disposed on the upper and lower portions of the yarn tensioning mechanism main body 30 and a driving mechanism 31i thereof.

The yarn feeding pipe 28a of the yarn supply device 2 and the needle 1 are moved by the yarn tensioning mechanism 3.
The thread 11 stretched between the position near 0 and the thread 11 is hung on the balance 41 and the sub-balance 42 of the balance mechanism 4.

In this embodiment, three sets of the balance mechanism 4 and the needles 10 corresponding to the balance mechanism 4 are arranged, and the frame 1c provided with the needles 10 is configured to swing in a horizontal plane. However, the number of sets of needles 10 provided on the frame 1c may be increased or decreased, or the frame 1c may be configured to slide in a horizontal plane.

The balance 41 is formed with a thread hooking hole 41a at the distal end and a cutout portion 41b at the base end into which the drive pin 41c of the balance 41 is inserted.

The sub balance 42 has a ring-shaped thread hooking hole 42a and a
A lever 42b having a distal end 2a, a sliding piece 42c slidably supporting the lever 42b, and a guide pipe 42d of a sliding piece 42c disposed substantially vertically in the thread tensioning mechanism main body 30, A magnet piece 42e for adsorbing the sliding piece 42c to the thread holding member 31 of the thread tensioning mechanism 3 and moving the sliding piece 42c up and down along the guide tube 34 in accordance with the elevation of the thread holding member 31, and a second end of the lever 42b. A shoe member 42g that contacts the provided roller 42f to regulate the position of the threading hole 42a,
A spring member 42h that urges a roller 42f disposed in addition to the lever 42b to abut on the shoe member 42g.

Thereby, the thread 11 is hooked on the thread hooking hole 41a of the balance 41 and the thread hooking hole 42a of the sub-balance 42, and embroidery is performed in a state where the thread 11 is held in a required zigzag shape.

At the time of embroidery, the balance 41 is driven back and forth 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 configuration and operation are the same as in the first embodiment.

The basic structure of the threading mechanism 6 is the same as that of the first embodiment. Among them, the thread pushing mechanism 64 is swingable to the thread pulling mechanism 61 via a shaft 64c as shown in FIG. Is formed in a hook shape so that the thread 11 hooked on the hook member 61a does not come off the hook member 61a.

By the way, in the present embodiment, the thread pressing mechanism 64 is used so that the thread 11 is securely hooked on the hook member 61a of the thread pulling mechanism 61 of the threading mechanism 6, but is not limited thereto. As in the modification shown in FIG. 38, air nozzles 65a, 65b are provided on the sides of the guide members 61b, 61b of the yarn pulling-out mechanism 61.
And the high-pressure air is discharged downward from the air nozzles 65a and 65b, so that the yarn insertion hole of the yarn pull-out mechanism 61 is provided.
It can be configured to push down both sides of the thread 11 inserted through 61c.

Then, in the embroidery sewing machine of the present embodiment, similarly to the embroidery sewing machine of the first embodiment, after the threading is performed, the thread selection mechanism 29 of the thread supply device 2 is driven to thereby control the thread 11.
The thread delivery tube 28a is moved to the side by one step (to the right) in a state where the embroidery is stretched, and embroidery is performed.

An auxiliary mechanism including an upper thread clamping mechanism, a thread cutting mechanism, and a cut thread collecting mechanism 53 is provided on the path around which the thread 11 is wound.

Among these, the cut yarn collecting mechanism 53 is for collecting the yarn 11 cut by the yarn cutting mechanism such as when converting the yarn 11, and as shown in FIG. 39 to FIG. An operating rod 53c formed with a hook 53b for hooking the operating rod 53, a driving mechanism 53d for the operating rod 53c, and suction pipes 53e and 53 through which the operating rod 53c is slidably inserted and which draws and collects the cut thread 11.
i, introduction pipes 53f, 53g of high-pressure air for generating a suction force or a sending power to the suction pipes 53e, 53i, 53j, and a collected thread 11 which is detachably disposed at the tip of the suction pipe 53j. And a drive mechanism 53k that slides and drives the recovery mechanism main body 53a between a standby position and a recovery position of the thread 11 around a sliding shaft 53m. I have.

In the embroidery sewing machine according to the present embodiment, the first
Similarly to the embroidery sewing machine of the embodiment, a cover body is provided on the sewing machine head 1, and the thread delivery pipe 28a is moved to the embroidery position one step side (right side) in a state where the thread 11 is stretched over the cover body. A lower thread clamping mechanism that clamps the thread 11 and a sensor that detects the state of the thread 11 are provided on the path on which the thread 11 is stretched when it moves.

Next, a method of operating the embroidery sewing machine according to the present embodiment (the first and second embodiments) will be described.

 First, an operation method at a stage prior to embroidery will be described.

When embroidery is started, the bobbins 21 of the respective color threads are stored in the bobbin storage section 22 of the thread supply device 2 which is disposed above or separately from the sewing head 1 of the embroidery sewing machine.
The yarn 11 drawn out of the yarn is wrapped around the yarn tension adjusting mechanism 24 via the yarn holder 23, and the end of the yarn 11 is hung from the yarn delivery pipe 28a by a predetermined length.

Next, an operation method for starting embroidery will be described.

The yarn supply device 2 over which the yarn 11 has been laid is placed above the threading device 7 which drives the yarn selection mechanism 29 to thread the yarn delivery pipe 28a of the yarn delivery mechanism 28 corresponding to the required bobbin 21. Selectively and accurately positioned.

Thereafter, the belt 35 of the yarn tensioning mechanism 3 is driven while the high-pressure air is sent from the air nozzle 28b into the yarn delivery tube 28a, so that the yarn clamping member 31 is moved from the standby position near the intermediate position to the yarn delivery tube 28a. The end of the thread 11 is moved to the highest position where the end of the thread 11 hung from 28a is clamped, and the end of the thread 11 is clamped by the thread clamping member 31.

Then, in a state where the resistance of the yarn tension adjusting mechanism 25 is not applied to the yarn 11 by the yarn tension releasing mechanism 26, the yarn 11 is advanced to a predetermined length by advancing the yarn length adjusting piece 27c of the yarn length adjusting mechanism 27. By driving the belt 35 of the thread tensioning mechanism 3, the thread holding member 31 is lowered, and the end of the thread 11 is guided to a position near the needle 10 at the threading position.

At this time, the yarn 11 stretched between the yarn delivery pipe 28a and the position near the needle 10 at the threading position by the yarn stretching mechanism 3 is
It is hung on the balance 41 and the auxiliary balance 42 of the balance mechanism 4.

Thereafter, the thread tension release mechanism 26 is released to release the thread.
The hook member 61a is lowered and advanced in advance with the resistance of the yarn tension adjusting mechanism 25 applied to the hook member 61a.
The thread 11 pinched by the thread pinching member 31 of the thread tensioning mechanism 3 is inserted into the thread insertion hole 61c of the guide member 61b of the thread pulling mechanism 61 in which the tip of the thread 11 is inserted into the needle hole 10a of the needle 10. The high-pressure air is fed from the air nozzle 63 disposed in the yarn feeding mechanism 61 toward the yarn pulling-out mechanism 61, and the yarn 11 held by moving back the yarn length adjusting piece 27c of the yarn length adjusting mechanism 27 is fed out. It is possible, and the yarn by the yarn clamping member 31
The holding of the thread 11 is released, and the thread 11 of the required length held by the thread length adjusting mechanism 27 is inserted into the thread insertion hole 61c of the guide member 61b of the thread pulling mechanism 61.

Then, after stopping the supply of the high-pressure air from the air nozzle 63, the yarn pulling-out mechanism 61 is retracted, and the yarn pressing piece 64a
Is swung in the direction to shield the thread insertion hole 61c.
By pushing down both ends of the thread 11 inserted along the side surface of the guide member 61b, the thread 11 inserted into the thread insertion hole 61c is
While accurately hooking the hook member 61a of the thread pulling mechanism 61, the thread pulling mechanism 61 is retracted, and the threading is performed by pulling out the hook member 61a from the needle hole 10a.

In this case, by driving the yarn selection mechanism 29 of the yarn supply device 2 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 belt 35 of the thread sweeping mechanism 3, the thread holding member 31 is returned to the standby position near the intermediate position, and embroidery is started.

At the start of embroidery, the lower thread clamp mechanism 81 is temporarily
Thus, the thread 11 below the lower thread clamping mechanism 81 is prevented from being fed out, and the end of the thread 11 is prevented from coming out of the surface of the embroidery cloth.

Thereafter, the clamp of the thread 11 by the lower thread clamp mechanism 81 is released, and embroidery is performed.

When replacing the thread 11, the upper thread clamp mechanism
In a state where the yarn 11 is clamped by 51 and a new yarn is prevented from being unreeled from the bobbin 21, the yarn 11 is hooked on a hook 53b formed at the tip of the operating rod 53c of the cut yarn collecting mechanism 53,
Below the needle plate and in the yarn cutting mechanism 52, the yarn 11
And the cut yarn 11 is collected in the collection container 53h via the suction pipe 53e of the cut yarn collection mechanism 53.

Hereinafter, the steps of threading and embroidering are repeated in the same manner.

According to the threading device in the embroidery sewing machine of the present invention,
It is possible to automatically carry out processing such as when changing the color thread or when the thread breaks without manual intervention, and also to reduce the time required for the operation, thereby improving the operating rate of the sewing machine and Since the productivity can be improved, it can be particularly suitably used for an embroidery sewing machine in which a large number of color threads are frequently replaced.

Claims (4)

(57) [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. It is characterized by comprising a sub-balance of a balance mechanism installed at a predetermined position, and a threading mechanism for inserting the thread guided by the thread clamping member of the thread tensioning mechanism to the position near the needle through the needle hole. Threading device in an embroidery sewing machine. 2. A thread pulling mechanism comprising a hook member having a hook-shaped tip and a guide member having a thread insertion hole and a thread relief groove disposed on both sides of the hook member. 2. The threading device for an embroidery sewing machine according to claim 1, further comprising an air nozzle for feeding a thread clamped by a thread clamping member into a thread insertion hole formed in a guide member of the thread pulling mechanism. 3. A thread pushing mechanism for pushing down both ends of a thread inserted into a thread insertion hole formed in a guide member of the threading mechanism along a side surface of the guide member.
3. A threading device in the embroidery sewing machine according to 2. 4. An operation punch formed with a thread cutting mechanism and a hook for hooking a thread at an end thereof, and an operation rod are slidably inserted into the path where the thread is wound, and the cut thread is drawn in. 4. The threading device in an embroidery sewing machine according to claim 1, further comprising a cut thread collecting mechanism having a suction pipe for collecting the cut thread.