JPH11267383A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the operation of changing threads during continuous sewing in which a number of color threads are changed, in a sewing machine equipped with automatic thread guard and thread passing devices. SOLUTION: A sewing machine, having automatic thread guard/thread passing devices 300, 500, 600 by which needle threads drawn out from a thread supply source are transferred and passed through the eye of a sewing needle N, includes the thread supply source in which three bobbins 11A, 11B, 11C (11) can be set and a thread-selecting feeder 200 which has three thread holding parts for holding the needle threads drawn out from the three bobbins 11 set in the thread supply source, and which can feed the three thread holding parts 221 so that the threads are selectively captured by the automatic thread guard and thread passing devices 300, 500, 600. The thread supply source is provided with thread winding members 108A, 108B, 108C which are rotatable about the bobbins 11 and which retreat to positions where they do not impede the flow of the threads drawn out from the bobbins during sewing, and which change position in an almost perpendicular direction to the threads during the winding of the threads.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine with an automatic threading / threading device for automatically threading an upper thread through a sewing needle.

[0002]

2. Description of the Related Art Generally, in an embroidery sewing machine, a plurality of upper threads of different colors are selectively used for replacement. Each time the upper thread is replaced, the upper thread is passed through the eye of a sewing needle. Since the operation is troublesome, various proposals have been made for devices capable of automatically performing the threading operation. For example, according to Japanese Patent Application Laid-Open No. 61-89365, a large number of yarns are guided in parallel, and a frame provided with a draw-in device for maintaining a predetermined amount of yarn for each yarn is selectively moved so that the posture is horizontal at the tip. Rotate the arm provided with the thread holding section that is kept at
2. Description of the Related Art There is known an automatic thread changing device in which a thread carried by a thread clamp is inserted into a needle hole by a thread inserting tool provided in a sewing machine main body.

[0003]

However, in the conventional sewing machine with an automatic thread changing device, when selecting a thread, as described above, a frame provided with a pull-in device for maintaining a predetermined amount of each thread is selected. In order to move the frame which has been enlarged by increasing the number of yarns, a larger space is required, and there is a problem that the operation is troublesome when replacing the yarns.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine provided with a thread selecting / conveying device which simplifies an operation for changing a thread during continuous sewing in which a large number of color threads are changed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 is directed to an automatic threading and threading device for transferring an upper thread drawn from a thread spool and inserting the thread into an eye of a sewing needle. In a sewing machine provided with a device, the sewing machine includes a thread supply source capable of setting a plurality of thread windings, and a plurality of thread grippers that respectively hold upper threads pulled out from the plurality of thread windings set in the thread supply source, And a thread selecting and transporting device capable of transporting the plurality of thread gripping portions so that the automatic threading and threading device selectively captures the thread.

Here, as an automatic threading / threading device, the upper thread in the thread path is gripped and transferred so as to protrude in the vicinity of the eye of the sewing needle, and the transferred upper thread is transferred to the sewing needle. Although they are inserted into the eye holes, their drive sources and the structures of the mechanisms for threading and threading are arbitrary. The yarn selection and transport device
It is a small one placed above the sewing machine.

As described above, according to the first aspect of the present invention, the upper yarns respectively drawn from the plurality of bobbins set in the yarn supply source are respectively held by the plurality of yarn grippers, and the automatic yarn is held. Since the sewing machine is equipped with an automatic threading / threading device equipped with a threading / transporting device that can transport the thread so that the threading / threading device can selectively capture the thread, the plurality of thread grippers provided on the threading / transporting device are The thread can be selectively captured by the automatic threading / threading device, and the thread winding can be easily replaced. Operation becomes simple.

According to a second aspect of the present invention, there is provided the sewing machine according to the first aspect, wherein the thread supply source is rotatable around the bobbin and does not obstruct the flow of the thread drawn from the bobbin during sewing. And a line winding member that changes posture in a direction substantially perpendicular to the line winding at the time of line winding. For example, the yarn winding member is a semicircular yarn winding wheel.

As described above, according to the second aspect of the present invention, it is possible to rotate around the bobbin, retreat to a position where the flow of the thread drawn out from the bobbin is not obstructed during sewing, and substantially take up the bobbin when winding the bobbin. Since the thread take-up member that changes its posture in the right-angle direction is a sewing machine provided in the thread supply source according to claim 1, during sewing, the take-up member retracts to a position where it does not hinder the flow of the thread and is loosened from the thread take-up. Further, at the time of winding the yarn, the yarn can be wound around the yarn winding by a yarn winding member rotating around the yarn winding.

According to a third aspect of the present invention, there is provided the sewing machine according to the second aspect, further comprising a yarn winding device having the yarn winding member and a driving source for rotating the yarn winding member. It is characterized in that the transfer device and the transfer device are each unitized and can be separated from the sewing machine main body. The thread winding device is a small one arranged above the sewing machine.

As described above, according to the third aspect of the present invention, the yarn winding device having the yarn winding member according to the second aspect and a drive source for rotating the yarn winding member, and the yarn selective transport device according to the first aspect, The sewing machine can be separated from the sewing machine body by unitizing the sewing machine. Therefore, it is easy to carry the sewing machine body by easily removing the thread take-up device and the thread selection / conveyance device arranged above the sewing machine from the sewing machine body. .

According to a fourth aspect of the present invention, there is provided the sewing machine according to the first aspect, wherein the thread selecting and conveying device holds the upper thread in a state where the upper thread is stretched in the vertical direction in each of the plurality of thread gripping portions. It is characterized by comprising a pair of upper and lower tension applying portions. For example, the tension applying unit includes a fixed tension plate and a thread presser plate biased by a spring.

As described above, according to the fourth aspect of the present invention, the yarn selecting and conveying device according to the first aspect of the present invention provides a yarn selecting and conveying device which holds an upper thread in a state where the upper thread is stretched in a vertical direction at each of a plurality of thread gripping portions. Since it is a sewing machine with one set of tension applying part,
With the thread stretched between the upper and lower tension applying sections, the thread can be reliably captured by automatic threading and threading.

According to a fifth aspect of the present invention, there is provided a sewing machine having an automatic threading and threading device for transferring an upper thread drawn from a thread spool and inserting the thread into an eye of a sewing needle. The threading device includes a thread transfer member having a thread catching unit that transfers the upper thread captured from the upper portion of the sewing machine to the needle hole,
It is characterized in that it comprises a variable presser pressure means capable of changing the yarn presser pressure of the yarn catcher to open, strong, or weak depending on the position of the yarn transfer member.

As described above, according to the fifth aspect of the present invention, the thread transfer member having the thread catching portion for transferring the upper thread captured from the upper portion of the sewing machine to the needle hole, and the thread presser pressure of the thread catching portion,
A sewing machine with an automatic threading and threading device equipped with a variable presser pressure means that can be changed to open / strong / weak depending on the position of the thread transfer member.・ Change to 3 levels of weak, from thread catch to thread hook
The threading can be performed reliably.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sewing machine according to the present invention will be described below with reference to FIGS. FIG.
FIG. 1 is a schematic perspective view showing an automatic threading / threading device, a thread winding device, and a thread selecting / conveying device of an embroidery sewing machine as an example of a sewing machine to which the present invention is applied, and FIGS. 2 to 19 show details of each part. FIG.

First, as shown in FIG. 3, an upper shaft 1 is a main motor (not shown) (see sewing machine motor 90 in FIG. 28).
The upper shaft shielding plate 2 composed of a plurality of fan-shaped plates fixed to an intermediate portion of the upper shaft 1 is rotatably driven by a photosensor (not shown) (see a main shaft sensor 91 in FIG. 28). , A signal of the rotational phase position of the upper shaft 1 is obtained. A counterweight 3 is fixed to one end of the upper shaft 1, and the swinging end of the crank rod 4 rotatably connected to the counterweight 3 is in the middle of a needle bar 5 that holds a sewing needle N. It is rotatably connected to the fixed needle bar holder 6. A balance 8 is connected to a base side of the crank rod 4 via a crank 7, and a swing end portion of the balance 8 is formed in a thread hooking portion 8 a bent in a “U” shape. A protruding portion 8b for preventing needle thread slip is formed in the middle of the portion 8.

On the upper part of the sewing machine main body, there are provided a yarn winding device 100 as a yarn supply source capable of selectively replacing a plurality of different colors of upper yarns, and a yarn selecting and conveying device 200. First, as shown in FIG. 1, the thread winding device 100 is disposed above the sewing machine, and includes three thread winding support rods 101 as shown in an enlarged manner in FIG.
That is, the three thread winding support rods 101A, 101B, 101
C is arranged vertically in parallel with the longitudinal direction of the upper shaft 1. The thread supporting rods 101A, 101B, 1
01C is provided with a thread winding stopper 102, respectively. As shown by the imaginary line, the spool stopper 102 is mounted with the spools 11A, 11B and 11C mounted on the spool supporting rods 101A, 101B and 101C, respectively.
The spools 11A, 11B, and 11C are threaded support rods 10.
It has a function of applying pressure so as not to rotate around 1A, 101B, and 101C.

The spool supporting rods 101A, 101B, 101
Since the members provided in C are the same, suffixes A, B, and C are given to the same reference numerals in the drawing, but in FIG. 17, the suffixes A, B, and C are omitted, and the thread winding is omitted. Support rod 1
Each member provided in 01 will be described. The bobbin supporting rod 101 is fixed at its lower end to the mounting plate 110 by screwing, and the mounting plate 110 is fixed to the base plate 120 by screwing. As shown in FIG. 17, on the upper part of the bobbin supporting rod 101, a bobbin receiving tray 103 is provided with a pin 10
3a and the illustrated E-ring, and a take-up body 104 is rotatably mounted below it. The winding body 104 has rising portions 104a and 104b for attaching a winding ring 108 serving as a yarn winding member on the outer periphery of the disk portion in a diametrically opposed manner.
Further, at the center of the lower surface of the disk portion, there is provided a cylindrical portion 104d into which the thread winding support rod 101 is inserted. A projection 104e for restricting rotation of the operating body 106 is formed at a lower end of the cylindrical portion 104d. The operating body 106 has an inner circumferential vertical groove 106a.
The take-up body cylindrical portion 104d is slidably inserted into the take-up body projection 104e which is engaged with the coil body while the rotation thereof is restricted, and a compression coil spring 105 is provided between both the disk portions of the operating body 106 and the take-up body 104. Is provided, and the operating body 106 is urged downward.

Further, a take-up pulley 107 located below the operating body 106 is rotatably mounted on the bobbin supporting rod 101. The take-up pulley 107 has a protrusion 107a at the upper part, and the operating body 106 has a protrusion 1 at the lower part.
06b, and when the operating body 106 is moving downward, the protruding portions 106b and 107a come into contact with each other.
Further, the winding wheel 108 has a U-shaped bent shape as shown in the figure, and one end 108 b has a winding body 104.
Rotatably inserted into one of the rising portions 104b,
The other end 108a is fixed to the take-up wheel operating body 109 via the opposite V-shaped portion 108c. The take-up wheel operating body 19 is rotatably mounted on the take-up body boss portion 104c of the other rising portion 104a of the take-up body 104, and is prevented from falling off by the cover plate 111.

The take-up body 104 and the take-up wheel operating body 10
9, a torsion coil spring 119 is hung,
As shown in FIG. 18, the force of the torsion coil spring 119 is applied in the opposite direction due to the difference in the rotational position of the winding wheel operating body 109, and the winding wheel operating body 109 and a part of the winding body 104 The position where the rotation is restricted by the contact is designed such that the V-shaped portion 108c of the winding wheel 108 is substantially vertical (see the solid line) and substantially horizontal (see the phantom line). In addition, the winding wheel operating body 1
09 is formed with a downwardly projecting portion 109a in which the winding wheel 18 is substantially vertical, and when the winding body 104 rotates, the projecting portion 1 provided on a spool cover (not shown) is formed.
12 (see FIG. 30).

The spool supporting rod 101 having the above members
In A, 101B and 101C, as shown in an enlarged manner in FIG. 15, the timing belt 113 is wound around the winding pulleys 107A and 107B, and the timing belt 113 is stretched around the winding pulleys 107B and 107C. The take-up pulley 107C of the bobbin winding support rod 101C is different from other take-up pulleys in that a lower portion is a gear 115, and the gear 115 is provided with a gear 13 of a take-up stepping motor 130 as a driving source.
1 is engaged. A thread guide rod 116 is fixed to a spool cover (not shown), and the thread guide rod 116 includes three thread winding support rods 101A, 101B, 1.
Each of the threading portions 116a, 11 located above
6b and 116c.

As shown in FIGS. 1, 13 and 14 and further enlarged in FIG.
An operation regulating plate A121 is rotatably mounted.
One end of the operation restricting plate A121 is in contact with the disk portion of the operating body 106A, and the operating body 1
06A is pushed up, and the stopper 1 provided on the base plate 120 is pressed.
It is in contact with 20d. The arm 141b of the operation plate A141 is lightly in contact with the other end of the operation restriction plate A121 from below by the force of the torsion coil spring 152. Working plate A1
41 is rotatably attached to the base plate 120,
The other end is a contact portion 141a formed in a circular shape.
The contact portion 141a protrudes from a movement locus of a winding switching plate 240 described later.

An operation restricting plate B122 is rotatably attached to the base plate 120. This operation regulating plate B122
Is in contact with the operating body 106B, pushes up the operating body 106B with the force of the torsion coil spring 153, and is in contact with the stopper 120e provided on the base plate 120. Further, the operation plate B142 is lightly abutted on the intermediate portion of the operation restriction plate B122 from above by the force of the torsion coil spring 154.
The operation plate B142 is rotatably attached to the base plate 120, and has an abutment portion 1 in which an intermediate portion of the arm is formed in a circular shape.
42a. The contact portion 142a protrudes along the movement locus of the winding switching plate 240.

The base plate 120 further includes an operation restricting plate C1.
23 is rotatably mounted. One end of the operation restricting plate C123 is in contact with the disk portion of the operating body 106C,
The operating body 106C is pushed up by the force of the torsion coil spring 155 and is in contact with the stopper 120f provided on the base plate 120. The arm 143b of the operation plate C143 is lightly in contact with the other end of the operation restriction plate C123 from below by the force of a not-shown torsion coil spring. The operation plate C143 is rotatably attached to the base plate 120, and the other end is a contact portion 143a having a circular shape. The contact portion 143a is located so as to protrude on the movement locus of the winding switching plate 240. As described above, the yarn winding device 100
Is configured.

Then, the yarn selecting / conveying device 200 is arranged as shown in FIG.
As shown in FIG. 13 and FIG. 14 and further enlargedly shown in FIG. 16, it is provided on a movable table 220 that moves along a feed screw 201 rotatably attached to a base plate 120. That is, the feed screw 201 is disposed in parallel with the upper shaft 1, and a gear 201 provided at one end of the feed screw 201 is provided with a gear of a feed stepping motor 210 which is a driving source installed on the base plate 120. 211
Are engaged. The feed screw 201 described above is inserted into the moving table 220, and a pin (not shown) fixed to the moving table 220 is engaged with the screw groove of the feed screw 201. It should be noted that the moving table 220 has
The rotation restricting body 203 is attached so as to sandwich the guide portion 120a from above and below.
The rotation of the feed screw 20 around the feed screw 201 is prevented.

On the moving table 220, three thread grippers 221 are provided.
In other words, three spool supporting rods 101 are provided.
A, a bobbin 11 set in 101B and 101C respectively
A, 11B, and three sets of thread grippers 221A, 221B for holding the upper thread respectively drawn out of 11C,
221C are provided side by side. The thread grip 221 is
It consists of a thread hook tension plate 222 and a thread presser plate 223,
That is, the thread presser plate 223 is attached to a shaft caulked to the thread hook tension plate 222, and the thread presser plate 223 is pressed against the thread hook tension plate 222 by the force of a compression coil spring (not shown). Note that a projection (not shown) formed on the thread holding plate 223 enters a hole 222a formed on the thread holding tension plate 222, and the upper thread between the thread hooking tension plate 222 and the thread holding plate 223 comes off. It is difficult.

A thread cutting guide 224 is provided next to the thread grip 221, and the thread cutting guide 224 holds a thread cutting blade 225 at a predetermined position from the thread grip 221. . The thread cutting blade 225 cuts the upper thread inserted between the thread tension plate 222 and the thread presser plate 223 to a predetermined length. Further, the moving table 22
0, three sets of thread grippers 221A, 221B, 221
Thread guide groove plates 226, 226, 2 for guiding yarn before C
26 are provided. Further, a take-up switching plate 240 protruding to the rear side is fixed at the center on the movable base 220. As shown in the drawing, the take-up switching plate 240
It has a T-shape in plan view, and its both ends 240a, 240
b is smoothly bent upward.

The above three sets of thread gripping parts 221A, 221
21B and 221C, a thread cutting guide table 224,...
30 is fixed. On this cover 230, three sets of thread hooks 231 are provided, that is, three thread winding support rods 101A, 101B. Three thread hooks 231A, 23 for respectively hooking upper threads pulled out from thread spools 11A, 11B, 11C respectively set in 101C.
1B and 231C are provided side by side. Further, three thread hooks 231A, 231B, 23
Three thread guide grooves 232A, 23 extending from 1C respectively
2B, 232C are formed, and when the upper thread is passed along each of the three thread guide grooves 232A, 232B, 232C, the respective thread gripping portions 221A, 221B, 22
The upper thread can be set at 1C.

The cover 230 has a thread cutting guide 224 for three thread grippers 221A, 221B and 221C.
Opening 23 for projecting 224 and 224 respectively
4A, 234B and 234C are formed. Therefore,
The upper thread that has been hooked on the three thread grippers 221A, 221B, 221C has openings 234A, 234B, 2
34C and thread cutting guides 224, 224, and 224 are passed along grooves formed by the guides, so that cutting can be performed. As described above, the yarn selecting and conveying device 200 is configured.

The winding stepping motor 130
Further, a connector 125 is provided for connecting the feed stepping motor 210 to a circuit board in the sewing machine body (not shown). In addition, the base plate 120 includes both left and right ends 120.
b, 120c, it is fixed to the sewing machine frame (not shown) by the set screws 126, 127. Therefore, the connector 125 is pulled out and the set screw 12 is removed.
6, 127, the yarn winding device 100 and the yarn selecting and conveying device 20 attached to the base plate 120.
0 can be separated from the sewing machine body.

As shown in FIGS. 1 and 8, the needle bar 5 is swingably mounted on a needle swing table 401 constituting a needle swing mechanism 400 to be described later. A threading means 300 is provided so as to be adjacent to the swinging swing table 401. As shown in FIG. 3, a threading positioning stopper 302 constituting the threading means 300 is screwed to a position immediately above the needle bar holder 6 fixed to the needle bar 5. A sewing needle N is attached to the portion by a needle screw 9 a provided on the needle stopper 9. A thread guide 10 is attached to the needle stopper 9 so as to guide the upper thread to the eye of the sewing needle N. Then, an automatic threading / threading device is constituted by the threading means 300, the thread passing means 500 and the threading means 600 described later.

As shown in FIG. 8, the upper end portion of the needle swing table 401 supporting the needle bar 5 has a left-right swing shaft 403 extending in the front-rear direction, and penetrates the left-right swing shaft 403 in the left-right direction. The front and rear swing shaft 404 provided to
The lower end portion of the needle swing rocking table 401 is mounted so as to rock in a free direction. A swing regulating arm (not shown) is connected to a lower end portion of the needle swing swing base 401. The lower end portion of the needle swinging swing table 401 is swingable in a substantially horizontal plane along an arc-shaped locus drawn by the swing restraining arm, and in particular, as shown in FIG. It is configured to reciprocate on the shuttle by the rotational driving force of the needle swing stepping motor 405 at 400.

A threading shaft 305 is mounted on the needle swinging swing table 401 so as to be rotatable and vertically movable substantially parallel to the needle bar 5. The cylindrical portion 307 of the threading lever 306 is fitted to the upper end portion of the threading shaft 305, and the lower end portion of the threading shaft 305 is particularly fitted as shown in FIGS. 5, 6, and 7. The well-known threading hook holder 3
08 is attached. And the threading lever 30
As shown in FIG. 5, an upper end portion of the threading shaft 305 is rotatably inserted into the cylindrical portion 307 of FIG. One end of an operation pin 310 fixed so as to penetrate the upper end portion of the threading shaft 305 in a direction perpendicular to the axis, is loosely fitted into a cam groove 311 formed in a cylindrical portion 307 of the threading lever 306. Has been inserted.

The cam groove 311 of the cylindrical portion 307 is
As shown in FIG. 7, an inclined groove cam 311a extending so as to form a part of a spiral shape, and the inclined groove cam 311a
And a vertical groove cam 311b extending upward in the axial direction from the upper end of the cam. The inclined groove cam 311a is connected to the threading lever 306.
The shaft moves relatively to the threading shaft 305, thereby imparting a rotating action to the threading shaft 305. The vertical groove cam 311b has a configuration for holding the threading shaft 305 so as to be axially movable without rotating it. As shown in FIG. 5, a compression coil spring 312 is interposed between the operating pin 310 and the upper end of the cylindrical portion 307 in a compressed state. The through lever 306 is maintained in a state of being pulled up.

The other end of the operating pin 310 is disposed so as to contact and separate from the threading positioning stopper 302 of the needle bar 5 from above in the axial direction. Actuating pin 310
Is in contact with the threading positioning stopper 302 of the needle bar 5, the threading hook 313 (see FIGS. 6 and 7) provided on the threading hook holder 308 is located at a position corresponding to the eye hole of the sewing needle N. The height relationship is adjusted so that the threading shaft 305 stops. The operating pin 310 is connected to the needle bar 5.
When the threading lever 306 is further depressed downward after contacting the threading positioning stopper 302, one end of the operating pin 310 is guided in the rotational direction along the inclined cam 311a. Is configured to be rotated together with the threading hook holder 308.

Further, as shown in FIG.
A tension coil spring 316 is stretched on a guide plate 314 provided so as to hang down from the upper end of the threading lever 01 with a projection 315 provided at an intermediate portion of the threading lever 306. This tension coil spring 316
The threading lever 306 is pulled upward by the upward biasing force.

Further, a locking portion 317 protruding toward the back side of the sewing machine is formed at an intermediate portion of the threading lever 306. The lowering operation of the threading lever 306 is performed when an operating body of the thread transfer means 500 described later comes into contact with the locking portion 317 from above. A threading stopper 318 that abuts the operating body of the thread transfer means 500 and stops the operating body at that position is provided at a substantially central portion in the height direction of the threading shaft 305 via a collar 319 (see FIG. 5). It is attached to a predetermined position. The threading stopper 318 can be attached to the needle bar 5.

On the other hand, as shown in FIGS. 6 and 7, a threading hook holder 308 is fixed at a lower end position of the threading shaft 305. As is well known, the threading hook holder 308 includes a pair of threading hook guide plates 320 and 32.
It has 0. These pair of threading hook guide plates 3
A threading hook 313 is fixed between 20,20. In each of the threading hook guide plates 320, 320, guide grooves 321 and 321 cut substantially horizontally are provided.
It is formed so as to be notched with the same height.
The upper thread A to be threaded is mounted so as to slide into these two guide grooves 321 and 321 and the threading hook 313 is inserted.
The upper thread A is hooked on the key portion 322 formed at the tip of the sewing needle N to draw the upper thread into the eye of the sewing needle N.

Here, the key portion 322 of the threading hook 313
Is formed so that the lower edge side of the plate-shaped hook body is cut out in a substantially triangular shape. Thereby, the upper thread A hooked on the key portion 322 of the threading hook 313 immediately drops downward from the key portion 322 of the threading hook 313 after the sewing needle N is inserted into the eye hole and is opened. Has become.

Further, as shown in FIG.
The needle stop thread hook mounting body 323 is rotatably mounted from the upper side of the threading hook holder 308, and the needle is attached to the rotating shaft 324 erected on the needle stop thread hook mounting body 323. A lock thread hook 325 is rotatably attached. As shown in FIG. 6, a partial gear 327 provided on the needle thread hook 325 is meshed with a partial gear 326 provided on the threading hook holder 308. Further, as shown in FIG. 5, a stopper member 328, which is provided in a cut-and-raised shape on the needle stopper thread hooking attachment body 323, comes into contact with the side surface of the threading lever 306 to restrict rotation, thereby enabling threading. The rotational force of the shaft 305 is transmitted to the needle stop thread hook 325, and the threading hook holder 308 and the needle stop thread hook 325 are rotated in opposite directions. Here, the swing end portion of the needle stopper thread hook 325 is formed in a forked shape for holding the threaded upper thread A. The bifurcated portions rotate in opposite directions simultaneously with the rotation of the threading hook holder 308 so as to approach and separate from each other.

On the other hand, as shown in FIGS. 1, 4 and 12, a thread transfer means 500 is arranged adjacent to the threading means 300. In this thread transfer means 500, a screw-shaped drive shaft 501 is provided substantially vertically on a base plate 502 so as to be adjacent to the threading shaft 305. A drive gear 503 is provided at the upper end of the drive shaft 501.
Is provided. Although not shown, an intermediate gear that is rotationally driven by a threading and threading stepping motor (see reference numeral “330” in FIG. 18) is meshed with the drive gear 503.

A thread transfer operating body 504 is screwed to the drive shaft 501 and reciprocated in the vertical direction. As shown in FIG. 4, the thread transfer operating body 504 includes an external operating body 505 having a hollow box shape mounted in a free movement state with respect to the drive shaft 501, and an internal operating body mounted inside the external operating body 505. And an operating body 506. When the drive pin 508 erected on the operation plate 507 disposed on the front side of the internal operating body 506 engages with the screw groove of the drive shaft 501, the vertical movement of the internal operating body 506 is performed. ing.

A compression coil spring 509 is arranged inside the external operating body 505 so as to contact the bottom of the internal operating body 506. This compression coil spring 50
Numeral 9 extends in the axial direction so as to push up the inner working body 506 upward. By the urging force of the compression coil spring 509, both the inner and outer working bodies 506 and 505 are configured to move in the vertical direction integrally with each other.

On the lower edge portion of the operating plate 507 provided on the inner operating body 506, a thread pushing locking portion 511 is provided so as to be bent at a substantially right angle. The thread pushing locking portion 511 is used as the locking portion 317 of the threading lever 306.
, The threading lever 306 is pushed down. Further, from the upper surface of the external operating body 505, the thread transfer locking portion 5
12 are provided so as to project substantially horizontally toward the threading shaft 305 side. When the thread transfer locking portion 512 of the external moving body 505 comes into contact with the threading stopper 318 of the threading shaft 305 from above,
The downward movement of the external operating body 505 is stopped.

Further, a rack gear 513 is arranged near the side of the external moving body 505 so as to rise substantially at a right angle. In a long vertical groove 514 formed in the rack gear 513, a regulating shaft 515 erected on an inner working body 506 so as to protrude substantially horizontally on a side portion of the outer moving body 505 so as to be vertically movable. It is fitted. By the guiding action based on such a configuration, the external moving body 505 is guided to move up and down without rotating.

Also, the side of the external moving body 505
As shown in FIG. 12, the thread transfer shaft 516 is fixed so as to protrude substantially horizontally so as to be adjacent to the upper regulation shaft 515. The yarn transfer operation gear 517 and the base side of the yarn transfer arm 518 are rotatably mounted on the yarn transfer shaft 516 via a collar. The thread transfer operation gear 517 and the base side of the thread transfer arm 518 are urged to rotate in opposite directions by a torsion coil spring 521 mounted on the thread transfer shaft 516. A projection 522 formed integrally with the thread transfer operation gear 517 so as to extend in the radial direction, and a locking pin 523 fixed to the base side of the thread transfer arm 518 include a torsion coil spring 512.
Abuts in the circumferential direction due to the rotational urging force. Thus, both members, namely, the thread transfer operation gear 517 and the thread transfer arm 518 are elastically engaged in the rotational direction via the torsion coil spring 521.

The yarn transfer operation gear 517 includes a rack gear 51.
3 and are arranged to mesh with the external operating body 505.
The yarn passing operation gear 517 moves up and down while rotating by moving up and down, and the yarn passing arm 518 rotates with the rotation of the yarn passing operation gear 517.

As shown in FIG. 19, each member is attached to the yarn transfer arm 518 which is a yarn transfer member. First, 580 is a thread transfer gripping section (yarn catching section), 581
Is a thread presser, and a thread transfer gripper 580 includes a thread presser 519 formed on a thread transfer arm 518 and a thread presser 58.
It consists of 1. The thread presser 581 is connected to the thread transfer arm 518.
The thread presser 581a is rotatably attached to a shaft crimped on the thread presser 581a.
Is pressed against the thread presser 519 of the thread transfer arm 518 by the force of the torsion coil spring 582. 583
Is a thread guide, and the thread guide 583 is rotatably attached to the thread transfer arm 518 and is urged clockwise by a torsion coil spring 585. The thread guide body 583 is connected to a contact portion 5 of a switching plate 579 described later.
When the shaft 586 (see FIG. 24) is pressed by the thread 79a in the thread stand-by state, the guide groove 5 for guiding the thread between the thread transfer arm thread press section 519 and the thread press body thread press section 581a.
84.

The switching plate 579 is slidably attached to the thread transfer arm 518, and is urged leftward in the figure by the force of a tension coil spring 575. This switching plate 5
79 has a contact portion 579 for pushing the yarn guide shaft 586.
a and contact portions 579a and 579b for pressing the other end 581a of the thread presser 581 from the left and right. 578
Is a switching operation body. This switching operation body 578 is rotatably attached to the thread transfer arm 518, and has a contact portion 578a for pressing the switching plate 579, and a stopper portion 57.
8b and a screw hole 578 for attaching the wire 576
c. The switching operation body 578 is urged by a force of the torsion coil spring 537 in a direction in which the switching plate 579 and the switching operation body contact portion 578a are separated (a direction in which the wire 576 is pulled). The direction of the wire 576 attached to the switching operation body 578 is changed by a roller 577, and the opposite end is attached to the switching body 533.
The switching body 533 is rotatably attached to the thread transfer arm 518, and is a contact plate 538 fixed to the frame.
And an operation hook 543 that comes into contact with a cam 522 provided on the operation gear 517.

Further, the thread transfer arm 518 is integrally provided with a lever portion 539 protruding from the thread transfer shaft 516 on the opposite side. At the tip of this lever 539,
The support roller 541 is rotatably mounted, and is configured to swing integrally with the rotation of the yarn transfer operation gear 517.

On the other hand, the supporting roller 5 provided on the lever portion 539 so as to be adjacent to the side of the rack gear 513
A thread transfer guide plate 542 for guiding the 41 is fixed. This yarn transfer guide plate 542 is composed of two stages of linear guide portions 542a and 542b. That is, the support roller 541 of the lever portion 539 abuts on the upper side linear guide portion 542a provided so as to protrude toward the near side of the sewing machine (the right side in FIG. 12), so that the thread transfer arm 5
18 is locked at a turning position that projects obliquely downward regardless of the rotation of the thread transfer operation gear 517. Further, the lower side linear guide portion 542b, which is provided so as to be slightly retracted to the back side of the sewing machine (the left side in FIG. 12), comes into contact with the support roller 541 of the lever portion 539, so that the thread transfer arm 518 is slightly lower. Is rotated. Accordingly, the yarn transfer arm 518 is locked at the vertically downwardly rotated position as shown by the two-dot chain line in FIG. 12, regardless of the rotation of the yarn transfer operation gear 517. I have.

Here, the switching body 533 includes the operating hook 5
43 are integrally provided so as to extend radially outward. As described above, the thread transfer arm 518
Is rotated to the lowermost position (see the two-dot chain line in FIG. 12), the operation hook 543 is moved to the thread transfer operation gear 517.
The positional relationship is set so that the user can ride on the radially leading end of the protrusion 522 provided at the front end. When the operation hook 543 runs on the projection 522 of the yarn transfer operation gear 517, the switching body 53 is moved by the amount of the running.
3 will be rotated. Thus, the pressing force of the thread presser 581 against the thread presser 519 by the torsion coil spring 582 for applying pressure is reduced.

Next, the operation of the thread transfer arm 518 will be described with reference to FIGS. First, FIG.
Is the threading standby position of the thread transfer arm 518, that is, the position shown in FIG. At this time, the switching body 533 is rotating because the switching body contact portion 533a is in contact with the contact plate 538. The switching operation body 578 linked to the switching body 533 by a wire 576 also resists the force of the torsion coil spring 537 and further resists the force of the extension coil spring 575 applied to the switching plate 579, and
Pressing 9 and rotating, it is in the position shown in FIG. In this position, the thread presser 581 is pressed by the switching plate contact portion 579a, and the thread presser thread presser 581a is separated from the thread transfer arm thread presser 519. In addition, the thread guide body 583 is in a state in which the thread guide body shaft 586 is pushed by the switching plate contact portion 579a, and covers the thread transfer arm thread holding section 519 as shown in FIG.

When the drive shaft 501 rotates, the
As shown in (Y), when the thread transfer arm 518 is rotated down, the switching body 533 is separated from the contact plate 538, and the switching operating body 578 is rotated by the force of the torsion coil spring 537, and as shown in FIG. The stopper 578b stops at a position where the stopper 578b hits the thread transfer arm 518. The switching plate 579 also moves by the force of the extension coil spring 575, and stops at the position where the end 581b of the thread presser 581 and the switching plate contact portion 579b abut. At this time, the force of pressing the thread presser body thread presser 581a against the thread transfer arm thread presser 519 is the force of the torsion coil spring 582 and the force of the extension coil spring 575. Therefore, the thread guide body 583 is rotated by the force of the torsion coil spring 585 to a position where the thread guide shaft 586 contacts the thread transfer arm 518 as shown in FIG.

When the drive shaft 501 further rotates, FIG.
As shown in (Z), when the thread transfer arm 518 moves to the threading standby position, the switching body operating hook 543 comes into contact with the operating gear cam 522, so that the switching body 533 is rotated and interlocked with the wire 576. The switching operation body 578 that has been rotated also rotates, and the switching plate 579 moves as shown in FIG. The position where the switching plate 579 has moved is such that the switching plate contact portion 579b is separated from the thread presser body end portion 581b, and as shown in FIG. 26, the switching plate contact portion 579c and the thread guide shaft 586.
Is in a position where it does not abut. Therefore, the force pressing the thread presser body thread presser 581a against the thread transfer arm thread presser 519 is only the force of the torsion coil spring 582. As described above, there is provided a variable presser pressure means for changing the pressing force of the thread by the thread pressers 519 and 581a of the thread transfer gripping portion 580 into three stages of opening, strong, and weak depending on the position of the thread transferring arm 518. I have.

Further, as shown in FIGS. 1, 8 and 9, a thread hooking means 600 for attaching the upper thread passed through the sewing needle N by the threading means 300 to the thread hooking portion 8a of the balance 8 is arranged. Have been. The yarn hooking means 600 also serves as a yarn feeding stepping motor 601 as a drive source. Then, the yarn feeding stepping motor 60
A yarn feeding roller 602 is fixed to one output shaft. An intermediate gear 605 rotatably fixed on a motor mounting plate 604 is always meshed with a drive gear 603 formed integrally with the yarn feeding roller 602.

On the other hand, to the motor mounting plate 604, a press-up mechanism (not shown) or a thread feeding rocking plate 606 that moves in conjunction with an automatic thread cutting device is rotatably mounted at a predetermined position. This thread feeding swing plate 60
A thread feeding tension coil spring 607 is hung on one end of the motor 6 and the motor mounting plate 604, and the other end of the thread feeding rocking plate 606 is urged in a direction away from the intermediate gear 605. . Further, one end of an auxiliary roller mounting plate 608 is rotatably connected to the other end of the yarn feeding rocking plate 606.
08 is slidably mounted on a support pin 609 erected on the motor mounting plate 604.

On the auxiliary roller mounting plate 608, a pair of auxiliary rollers 611 and 611 are rotatably provided so as to be in contact with the yarn feeding roller 602 by the urging force of the yarn feeding tension coil spring 607. A driven gear 612 is integrally formed with each of these auxiliary rollers 611, and when the auxiliary rollers 611 and 611 come into contact with the yarn feeding roller 602, each of the auxiliary rollers 611 is formed.
The driven gear 612 meshes with the drive gear 603 of the yarn feeding roller 602. The yarn feeding roller 602 is provided so as to be exposed from a long hole formed in the auxiliary roller mounting plate 608.

Further, a second intermediate gear 605a provided integrally with the intermediate gear 605 is exposed from the elongated hole of the auxiliary roller mounting plate 608. A thread take-up operation gear 613 is rotatably provided on the auxiliary roller mounting plate 608 so as to be adjacent to the second intermediate gear 605a. The thread take-up operation gear 613 is arranged so as to come into contact with and separate from the intermediate gear 605 by sliding along with the auxiliary roller mounting plate 608. That is, as described above, when the auxiliary rollers 611 and 611 come into contact with the yarn feeding roller 602, the yarn take-up operation gear 613 is set to the intermediate gear 605.
When the auxiliary rollers 611 and 611 are separated from the yarn feeding roller 602, the yarn take-up operation gear 613 is in an engaged state with the intermediate gear 605.

A first hooking arm 614 having a crank shape is attached to the thread take-up operation gear 613 so as to swing by rotation of the thread take-up operation gear 613. The first threading first arm 614 is provided on the swing arm side with the first threading first arm 614.
The second thread hook is slid in the arm direction of the arm 614.
An arm 615 is attached. A thread take-up hook 61 of a well-known structure is attached to the tip of the
6 is attached.

As is well known, the thread take-up hook 616 is provided with a thread take-up spring 617 which is engaged with a part of the upper thread passed through the sewing needle N by the threading means 300, and is connected to the thread guide groove 61.
8 is provided in a thread take-up bracket 619 provided. The thread take-up bracket 619 is rotatably mounted on the leading end of the second thread take-up arm 615 by a thread take-up shaft 620. The upper guide shaft 621 and the lower guide shaft 622 provided in the thread take-up bracket 619
By sliding on the guide path 624 of the curved thread take-up guide member (face plate) 623 disposed adjacent to the upper thread, the upper thread held by the thread take-up spring 617 is moved.
The thread is hooked on the thread hook 8a of the balance 8. The upper guide shaft 621 and the lower guide shaft 622 are pressed onto the guide path 624 of the thread take-up guide member 623 by a thread take-up torsion coil spring 625 that applies a rotational urging force to the thread take-up bracket 619.

Further, a thread take-up engaging groove 626 extending obliquely downward extends at the lower end of the guide path 624 of the thread take-up guide member 623. The upper and lower guide shafts 621 and 622 are arranged in the thread take-up engagement groove 626 so as to be fittable. As shown in FIG. 11, when the guide shafts 621 and 622 are fitted in the thread take-up engagement groove 626, the thread take-up bracket 619 is locked at the lower end position. Have been. Further, a motor mounting plate 60 is provided at an intermediate portion of the threading second arm 615.
4, a tension coil spring 627 is mounted. The thread cutting bracket 619 is held at the above-described lower end position by the tension of the extension coil spring 627.

Here, as shown in FIG. 11, the thread take-up torsion coil spring 625 is set in the thread take-up spring receiver 651 and screwed to the thread take-up bracket 619. This thread take-up spring receiver 651 has a thread breakage shielding cylinder 65.
2 is rotatably assembled, and a thread take-up torsion coil spring 625 is inserted into a groove formed in the thread breakage shielding cylinder 652.
Is inserted. Therefore, the thread take-up torsion coil spring 6
When 25 is bent, the thread breakage shielding cylinder 652 rotates. The thread breakage shield plate 653 is formed on the thread breakage shield cylinder 652.
When the 6 (thread take-up bracket 619) is at the sewing position, the photo sensor 654 attached to the thread cutting guide member (face plate) 623 is opened and closed. That is, the photo sensor 65
4 is a thread break sensor (thread break detecting means).

On the other hand, as shown in FIGS. 8 and 10, the needle swing arm 406, which reciprocates in the left-right direction by the needle swing stepping motor 405, is provided at the lower end of the needle swing rocking table 401 of the needle swing mechanism 400. The moving end portion is rotatably connected. Through this needle swing arm 406, the needle swing rocking table 401 substantially moves the upper part of the needle plate around the left and right rocking shaft 403 and the front and rear rocking shaft 404 provided at the upper end portion of the needle rocking rocking table 401. It is configured to swing in an arc shape. A swing link 407 is provided at the base end of the swing arm 406. The tip of the swinging link 407 is connected to the swinging stepping motor 4.
05 is pressed against the outer peripheral cam surface of the swinging cam 408 which is driven to rotate by the tension of the swinging tension coil spring 409. Thus, the above-described needle swing operation is performed according to the outer peripheral shape of the needle swing cam 408.

Here, the rotating shaft 411 of the swinging cam 408
, A thread take-up cam 630 is fixed. A thread take-up switching plate 631
Is in contact with the swing arm 631a from below. The thread take-up switching plate 631 is rotatably mounted on the switching shaft 632. The other swing arm 631b extending toward the upper side of the thread take-up switching plate 631 is provided with a thread take-up spring stopper 633 rotatably arranged in a horizontal plane.
Is loosely inserted into a locking hole 634 provided on one side of the swing arm.

The swing arm on the other side of the thread take-up spring stopper 633 is formed so that a thread take-up stopper plate 635 is bent downward. By the rotation urging force of the stop torsion coil spring 637 attached to the rotation shaft 636 of the thread take-up spring stopper 633,
The thread take-up stopper plate 635 is arranged so as to engage with the middle part of the second threading arm 615. Thereby, the swing of the second thread hook arm 615 is restricted.

Then, the thread take-up cam 630 is
When the projection-like cam portion provided on the thread take-up cam 630 comes into contact with the thread take-up switching plate 631, the thread take-up switching plate 631 and the thread take-up stopper plate 6 are rotated.
The thread take-up stopper plate 635 is separated from the thread hooking second arm 615 to be in an open state. This allows the threading second arm 615 to rotate.

Further, as shown in FIG.
An upper base tension plate 640 for guiding the upper thread guided to the balance 8 is disposed on the upper side of the motor mounting plate 604 of No. 0. The lower base tension plate 642 is brought into close contact with the lower surface of the upper base tension plate 640 by the urging force of the compression coil spring 641 attached to a shaft extending downward from the upper base tension plate 640.

Although not shown, the above-described embroidery sewing machine with a thread changing device is provided with a front panel for various operations. The front panel has an operation panel for thread changing as shown in FIG. 70 are provided.
As shown, the operation panel 70 for thread replacement includes a thread selection start switch (A) 71, a thread selection start switch (B) 72, a thread selection start switch (C) 73, a thread hooking start switch 74, A take-up start switch 75 and continuous exchange start switches 76 and 77 are provided.

Here, the continuous exchange start switch 76 performs the thread hooking from A in the yarn winding device 100 and the yarn selecting / conveying device 200, exchanges them with B and C, and returns to A after C and returns to A. A switch for starting the operation of exchanging B and C and repeating the above until the color thread sewing of the embroidery sewing is completed again. In addition, the continuous exchange start switch 77
Conversely, it is a switch that starts the operation of threading from C, exchanging with B and A, and repeating the above. Above the continuous exchange activation switches 76 and 77, continuous exchange instructing display sections 76a and 77a are provided by LEDs for displaying that continuous exchange is instructed.

FIG. 28 is a control block diagram of the sewing machine. The central control unit 80 is composed of a microcomputer, a ROM, a RAM, an I / O port and the like, and includes a key matrix 78, a thread break sensor 654, a spindle sensor 91 and the like. It is connected. Further, a sewing machine motor 90 is connected to the central control device 80 via a drive circuit 81, and each of the stepping motors 130, 210, 330, 601, 405 controls each of the drive circuits 82, 83, 84, 85, 86. Connected through. The key matrix 76 includes the thread selection start switches 71, 72, 73 and the thread hook start switch 7.
4, a take-up start switch 75, a continuous exchange start switch 76, 77 and the like are included.

Next, how to set the upper thread will be described. First, when the upper thread is set at the position A, the thread winding 11A is set on the thread winding support bar 101A, and the winding wheel 108A is turned by hand when it is horizontal to make it vertical. Then, the upper thread is pulled out from the thread winding 11A, threaded on the threading portion 116a of the thread guide bar 116, and then threaded on the threading 231A of the moving table cover 230, and the upper thread is passed along the guide groove 232A. Thereby, the upper thread is put into the thread grasping portion 221A. That is, the upper thread is inserted between the thread tension plate 222 and the thread presser plate 223, and the upper thread is cut by the thread cutting blade 225 attached to the thread cutting guide 224. At this time, the upper thread is in a state of hanging down from the thread gripping portion 221A by a predetermined length. In addition,
When the upper thread is set at the positions B and C, the spools 11B and 11C are set on the spool supporting rods 101B and 101C, respectively, and the same operation is performed.

Next, the operation of hooking and threading the upper thread set at the position A as described above will be described. When the operator presses the thread selection start switch (A) 71 and presses the thread hooking start switch 74, the feed stepping motor 210 is driven, whereby the movable table 220 moves on the feed screw 201 which rotates, thereby moving. Stand 22
At 0, the thread hanging down from the thread gripping portion 221A stops at the thread hooking position (A) located in front of the guide groove 584 of the thread guide body 583 provided in the thread transfer arm 518.

By operating a press-up mechanism (not shown) or an automatic thread cutting device, the thread feeding rocking plate 606 of the thread hooking means 600 is moved to separate the auxiliary rollers 611 and 611 from the thread feeding roller 602, The thread take-up operation gear 613 meshes with the second intermediate gear 605a of the gear 605. At the same time, the needle take-off stepper motor 405 removes the thread take-off stopper plate 635 to allow the thread hooking second arm 615 to rotate.

Thereafter, a stepping motor for thread transfer and threading (not shown in FIG.
Is driven forward for a predetermined number of steps, the drive shaft 501 is rotated, and the external operating body 505 descends together with the internal operating body 506. Thus, the yarn transfer arm 51 is moved by the rack gear 513.
8 descends while rotating.

Further, as the thread transfer arm 518 rotates and descends, and the switching body contact section 533a moves away from the contact plate 538, the thread presser thread press section 581a rotates in the direction of the thread transfer arm thread press section 519. The yarn guide 583 rotates clockwise. Switching body contact portion 533a and contact plate 5
When the thread 38 is completely separated, the upper thread is moved to the thread presser body thread presser 58.
1 a and the thread transfer arm thread presser 519, are sandwiched between the torsion coil spring 582 and the tension coil spring 575,
As shown in FIG. 29, the thread winding side of the sandwiched upper thread is hooked on the thread guide groove 584.

When the yarn transfer arm 518 is rotated down to the position where the upper yarn is captured, the feed stepping motor 21
0 to move the moving table 220 and move the moving table 2
The take-up switching plate 240 fixed to the operation plate A14
It stops at the position where it comes into contact with the first contact part 141a. When the operation plate A contact portion 141a is pushed down by the winding switching plate 240, the arm portion 14 of the operation plate A 141 is pressed.
1b pushes up one end of the operation regulating plate A121,
The operating body 106A is lowered in the direction of the take-up pulley 107A by the force of the compression coil spring 105. As a result, the operating body 106A is connected to the take-up pulley 107A via the protrusions 106b and 107a. Therefore, the take-up body 104A having the take-up wheel 108A is driven to rotate by the take-up stepping motor 130. Becomes possible.

At the same time, the yarn feeding hook 616 is moved to the upper end position along the guide path 624 by driving the yarn feeding stepping motor 601 to rotate forward several steps. This movement of the thread take-up hook 616 is performed while the second thread take-up arm 615 slides and expands / contracts with respect to the first thread take-up arm 614. The size of the sewing machine can be reduced and the appearance can be improved.

The yarn transfer arm 518, which has been rotated and lowered during the above-described operation, is connected to the support roller 54 provided on the lever portion 539.
1 is an upper side linear guide portion 542a of the yarn transfer guide plate 542.
When the thread transfer arm 518 stops rotating at a position where the thread transfer arm 518 does not contact another member, the thread transfer arm 518 descends. By doing so, it is possible to lower the thread transfer arm 518 in a state where the overhang amount is minimized, and it is possible to reduce the size of the appearance of the sewing machine. At this time, the upper thread is guided into the thread guide groove 584.

Then, the thread pushing lever 306 of the internal operating body 506 comes into contact with the engaging portion 317 of the threading lever 306 from above, so that the threading lever 306 is pushed downward by a predetermined amount. , The operating pin 310 is the needle bar 5
Abuts the threading positioning stopper 302 from above in the axial direction. Accordingly, the threading shaft 305 stops at a height position where the threading hook 313 provided on the threading hook holder 308 matches the eye of the sewing needle N. Immediately after the threading shaft 305 stops in this way, the external operating body 505 comes into contact with the threading stopper 318 of the threading shaft 305 from above, and the downward movement of the external operating body 505 also stops.

Before the downward movement of the external operating body 505 stops, the support roller 541 provided on the lever 539 is provided.
Abuts on the lower linear guide portion 542b. As a result, the thread transfer gripping portion 580 has rotated to a region inside the sewing needle N. This is indicated by the position shown in FIG. At this time, the thread presser body thread presser 581a
The upper thread, which is caught by the thread transfer arm thread presser 519 and hooked by the thread guide body guide groove 584 and stretched therebetween, is adjusted so as to be positioned in front of the eye of the sewing needle N. I have. Further, since the switching body operation hook 543 is in contact with the operation gear cam 522, the thread presser body thread presser 58
1a is pressed against the thread transfer arm thread presser 519.
Only the force of the torsion coil spring 582 is provided.

After that, when the threading lever 306 is further lowered together with the internal operating body 506, the operating pin 310 is rotationally guided along the inclined groove cam 311a.
At this time, the needle thread hook 325 passes the upper thread through the thread guide 10 of the needle stopper 9 in a state where the upper thread is hooked on the distal end portion, so that the supply path of the upper thread is formed well. Then, the thread take-up hook 616 enters the needle hole.

Further, when the thread take-out hook 616 is moved downward by the reverse rotation of the thread feeding stepping motor 601 and the middle portion of the upper thread is hooked, the upper thread upstream of the thread take-up side from the thread take-up hook 616 is moved to a predetermined position. Is set on the thread feed-out roller 602 and the upper thread downstream of the thread take-up hook 616 on the side of the sewing needle N is placed on an intermediate portion of the balance 8.

Next, the swinging stepping motor 405
The needle swing cam 408 is returned to the original position by
The thread take-up stopper plate 635 is returned to the locking position, and the rotation of the thread hooking second arm 615 is locked. At this time,
An upper thread is sandwiched between the thread feeding roller 602 and the auxiliary rollers 611 and 611. The thread take-up hook 616 that has reached the lower end position is held at that position by the thread take-up engaging groove 626 as shown in FIG.

Then, by reversing the drive shaft 501, the upper thread stretched in front of the needle hole is hooked by the thread take-up hook 616 and drawn into the needle hole. At this time, the upper thread is sandwiched between the thread presser body thread presser 581a and the thread transfer arm thread presser 519 with a weak force of only the torsion coil spring 582.
Is pulled out and passed through the needle hole. When the rotation of the thread take-up hook 616 ends, the thread transfer arm 518 rotates and returns to the thread hooking standby position. As described above, the thread hooking / threading of the upper thread set at the position A is completed, and the preparation for winding is completed. The upper thread set at the positions B and C can be similarly threaded and threaded.

Next, a method of winding the yarn around the yarn winding 11 will be described. When the upper thread is wound up to replace the upper thread after the completion of the predetermined sewing, if the upper thread is connected to the needle, the upper thread is cut by an automatic thread cutter (not shown) provided in the sewing machine. By pressing the take-up switch 75, winding is started. That is, as described above, the moving platform 220 is configured such that the take-up switching plate 240 is
41A, the roll 104A
Is in a state where it can be driven to rotate by the winding stepping motor 130. Accordingly, when the winding stepping motor 130 is driven to rotate the winding body 104A clockwise in plan view, the operating body projection 109a of the winding wheel A comes into contact with the bobbin stand cover projection 112, and The take-up wheel 108A is tilted down by the force of the torsion coil spring 119, and is kept substantially horizontal.

In the subsequent rotation, the yarn between the yarn winding 11A and the yarn guide bar yarn hooking portion 116a is wound around the winding wheel V-shaped portion 10a.
When the hook 8c is hooked and rotated, the upper thread winds around the thread spool 11A as shown in FIG. Here, the winding stepping motor 130 rotates by a predetermined amount and stops. The amount of rotation is set to an amount by which the upper thread in the thread path is completely wound around the thread winding 11A. As described above, the upper thread can be wound around the spool 11A.

In the thread take-up device 100, the take-up wheel 108 is positioned substantially vertically during sewing, and the upper thread consumed for sewing is pulled out from the thread spool 11 so as to be loosened. No unnecessary resistance is generated. The take-up switching plate 240 is set at the positions B and C by moving the moving table 220 to positions where the winding switching plate 240 comes into contact with the operating plate B abutting portion 142a and the operating plate C abutting portion 143a. Similarly, the upper thread can be wound around each of the bobbins 11B and 11C.

The embroidery sewing machine provided with the apparatus of the above embodiment continuously performs the above-described automatic threading, threading and thread winding operations when performing embroidery sewing using a large number of color threads. It can be carried out.

Next, the operation in the case of sewing an embroidery using upper threads of three colors or more will be described. First, an operator selects a desired embroidery using an embroidery operation panel (not shown). Subsequently, for example, the color thread to be sewn first is set at the position A in the manner described above. Similarly, the second color thread to be sewn is set to the position B, and the third color thread to be sewn is set to C.
To the position. And the continuous exchange start switch 7
When the user presses the button 6, the first thread to be sewn at the position A is automatically threaded and threaded as described above, and after the automatic threading and threading is completed, the operator enters a sewing machine (not shown). When the start switch is turned on, the embroidery sewing of the first color thread starts.

When the sewing of the first color thread is completed, the first color thread is cut by the automatic thread cutting device. At this time, the sewing machine
A buzzer sounds to inform the operator that the sewing of the first color thread has been completed. After the first color yarn is cut, the take-up stepping motor 130 is driven, and as described above, the first color yarn is
It is wound around the bobbin 11A set in A. 1
When the winding of the second color thread is completed, the moving table 220 moves to the thread hooking position of B, and automatic thread hooking and threading are performed. After the completion, sewing of the second color thread is automatically started. .

After the sewing of the second color thread is completed, similarly,
The winding of the second color thread, the automatic threading and threading of the third color thread set at the position C are performed, and the sewing of the third color thread is started automatically. Here, the operator removes the spools 11A and 11B, on which the thread has been wound, respectively set on the spool supporting rods 101A and 101B.
The fourth color yarn is set at the position A, and the fifth color yarn is set at the position B. When the sewing of the third color thread is completed, 4
When the upper thread is automatically exchanged for the fourth color thread and the sewing of the fourth color thread is completed, the upper thread is automatically exchanged for the fifth color thread, and when the sewing of the last color thread is completed, The sewing machine stops.

As described above, according to the present invention, the following effects can be obtained. (1) Since the yarn selection and transfer device 200 performs the yarn exchange by selecting the yarns sequentially from the end, the operation is easy to understand. (2) Since the thread stretched up and down is captured by the thread transfer grip 580 of the thread transfer arm 518, the capture is reliably performed. (3) The thread winding device 100 is pulled out so that the thread is unraveled from the thread spool 11 during sewing, so that unnecessary tension is not applied to the upper thread during sewing. (4) Yarn winding device 100, Yarn selective conveyance device 200
Is unitized so that it can be easily removed from the sewing machine main body, so that the sewing machine main body is easy to carry. (5) Since the pressing force of the thread transfer gripping portion 580 for holding the upper thread of the thread transfer arm 518 is changed to three levels of release, strong, and weak, the capture of the thread and the threading of the needle hole are reliably performed. .

<Modification> FIG. 31 shows a modification of the parts provided on the moving table 220.
It is the perspective view shown including. In the figure, reference numeral 250 denotes the mobile platform 2
The thread setting table 250 is fixed on the thread setting table 250. When the moving table 220 moves in the direction of the thread transferring arm 518, the thread setting table 250
An opening 260 opened to the front side and penetrating in the lateral direction is formed so as not to interfere with the thread guide 80 and the yarn guide 583. On the upper surface of the thread setting table 250, three thread hooks 251 are provided.
A pair of the three spool supporting rods 10
The thread spool 1 set on each of 1A, 101B and 101C
Three thread hooks 251A, 251B, 2 for hooking upper threads respectively drawn from 1A, 11B, 11C.
51C are provided side by side.

On the front side of the thread setting table 250, the opening 26
A first tension plate 252 is fixed to the upper side of the first tension plate 252. Three shafts 253, 253, and 253 caulked to the first tension plate 252 have a first thread presser plate 2.
54A, 254B, and 254C are provided. These three first thread presser plates 254A, 254B, 254C
Are pressed against the first tension plate 252 by the force of the respective compression coil springs 255, 255, 255. In addition, at the front of the thread setting table 250, the opening 260
A second tension plate 256 is fixed to the lower side of the shaft. Three holes formed in the second tension plate 256 are provided with shafts 258, 258, of second thread presser plates 257A, 257B, 257C. 258 are inserted from the back side and fixed. These three second thread presser plates 257A, 257
B, 257C are pressed against the second tension plate 256 by the force of the respective compression coil springs 259,.

As described above, three sets of upper and lower tension applying sections are provided. A slit groove 261 is formed in the lower part of the front surface of the yarn set 250 along the lower part of the second tension plate 256 and the three yarn guide grooves 26 are formed.
2A, 262B and 262C are formed. Each of the three yarn guide grooves 262A, 262B, 262C has
The thread cutting blades 263, 263, 263 are respectively attached.

Next, a method for setting the yarn will be described. FIG.
Is a state where the upper thread A is set at the position A. Similarly to the above-described embodiment, the spool 11A is set on the spool supporting rod 101A, and the winding wheel 108A is set.
After the upper thread A is pulled out from the thread winding 11A and threaded on the thread guide rod threading portion 166a,
As shown in FIG.
Thread on 51A. Then, the first tension plate 252
Between the second tension plate 256 and the second thread presser plate 257A, and the thread A is inserted into the thread guide groove 262A. The thread A is cut by the cutting blade 263.

Thus, as shown, the upper thread A is held between the first tension plate 252 and the first thread presser plate 254A and the second tension plate 256 and the second thread presser plate 257A.
Will be in a stretched state. Similarly, the upper thread is set at the positions B and C. As described above, during the automatic threading / threading, the first tension plate 252 and the first
The upper thread A stretched between the thread presser plate 254A, the second tension plate 256, and the second thread presser plate 257A can be reliably guided into the guide groove 584 of the thread guide 583.

In the above embodiment, the embroidery sewing machine is used. However, the present invention is not limited to this, and another sewing machine may be used. In addition, the shape and the like of various parts are arbitrary, and it goes without saying that the specific detailed structure and the like can be appropriately changed.

[0101]

As described above, according to the sewing machine according to the first aspect of the present invention, the plurality of thread grippers provided in the thread selecting and conveying device selectively control the thread with respect to the automatic threading / threading device. Since the thread winding can be easily exchanged, the operation at the time of thread exchange during continuous sewing performed by changing a large number of color threads can be facilitated.

According to the sewing machine of the second aspect, in addition to the effects obtained by the first aspect,
During sewing, the winding member is retracted to a position where the flow of the yarn is not obstructed, and the yarn can be pulled out so as to be loosened from the yarn winding.At the time of winding the yarn, the yarn winding member rotating around the yarn winding winds the yarn around the yarn winding. This has the advantage that it can be wound.

According to the sewing machine of the third aspect, in addition to the effects obtained by the second aspect,
By easily removing the thread take-up device and the thread selection and transport device disposed above the sewing machine from the sewing machine main body, there is an advantage that the sewing machine main body can be easily carried.

According to the sewing machine of the fourth aspect, in addition to the effects obtained by the first aspect,
An advantage is obtained in that the yarn is stretched between the upper and lower tension applying portions so that the yarn can be reliably captured by automatic threading and threading.

According to the sewing machine according to the fifth aspect of the present invention, the thread presser pressure of the thread catching section is changed to three stages of release, strong, and weak depending on the position of the thread transfer member, and the thread catching, thread hooking, and thread catching are performed. It is possible to surely carry out through.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an automatic threading / threading device, a thread winding device, and a thread selecting / conveying device of an embroidery sewing machine as an example of a sewing machine to which the present invention is applied.

FIG. 2 shows the automatic threading / threading device (threading means,
FIG. 3 is an enlarged view of a yarn passing means and a yarn hooking means).

FIG. 3 is a perspective view showing an upper shaft and a connection structure around the upper shaft.

FIG. 4 is an enlarged perspective view showing a drive system of the thread passing means and the threading means of FIG.

FIG. 5 is an enlarged perspective view showing the structure of the threading means of FIG. 1;

FIG. 6 is an enlarged plan view showing a structure of a threading hook in the threading means of FIG. 5;

FIG. 7 is an enlarged perspective view showing the threading hook of FIG. 6;

FIG. 8 is an enlarged perspective view showing the structure of the automatic thread hooking means and the needle swing mechanism of FIG.

FIG. 9 is an enlarged front view showing the automatic thread hooking means of FIG. 8;

FIG. 10 is an enlarged side view showing a connection relationship between the automatic thread hooking means and the needle swing mechanism in FIG. 8;

FIG. 11 is a plan view showing a structure around a thread take-up bracket in FIG. 9;

FIG. 12 is an enlarged front view showing the structure of the thread passing means and the threading means of FIG.

FIG. 13 is an enlarged view of the yarn winding device and the yarn selecting / conveying device of FIG. 1;

FIG. 14 is an exploded perspective view of the yarn winding device and the yarn selection / conveyance device of FIG.

FIG. 15 is an enlarged view of the yarn winding device of FIG. 14;

FIG. 16 is an enlarged view of the yarn selecting / conveying device of FIG. 14;

17 is a longitudinal sectional side view of a thread winding support rod and a thread winding mechanism in the thread winding device of FIG. 15;

FIG. 18 is an enlarged side view showing a configuration of a V-shaped portion of the take-up wheel in FIG.

19 is an exploded perspective view showing, in an enlarged manner, the thread transfer arm and its components in FIG. 1. FIG.

FIG. 20 shows a movement mode of the thread transfer arm.
(X) is a side view showing an upward state, (Y) is a side view showing a state in the middle of rotation and descent, and (Z) is a side view showing a downward state.

FIG. 21 shows a change state of the thread transfer gripping portion,
It is a top view corresponding to 0 (X).

FIG. 22 is a view showing a change state of a thread transfer grip portion, and FIG.
It is a top view corresponding to 0 (Y).

FIG. 23 shows a change state of the thread transfer grip portion, and FIG.
It is a top view corresponding to 0 (Z).

FIG. 24 is a front view corresponding to FIG. 21 and showing a moving mode of the switching plate.

FIG. 25 is a front view, corresponding to FIG. 22, showing the manner of movement of the switching plate.

FIG. 26 is a front view corresponding to FIG. 23, showing a mode of movement of the switching plate.

FIG. 27 is a front view showing an operation panel for threading provided in the sewing machine.

FIG. 28 is a control block diagram of the sewing machine.

FIG. 29 is an enlarged perspective view showing a state where an upper thread is hooked on a thread transfer gripping portion.

FIG. 30 is a perspective view showing a state in which the yarn is wound around the yarn winding.

FIG. 31 is a perspective view showing a modified example of the components provided on the moving table, including a thread transfer gripping portion.

[Explanation of symbols]

 A Needle thread N Sewing needle 1 Upper shaft 5 Needle bar 8 Balance 9 Needle stopper 10 Thread guide 11 Thread winding 70 71, 72, 73 Thread selection start switch 74 Threading start switch 75 Winding start switch 76, 77 Continuous exchange start switch 80 Control device 90 Sewing machine motor 100 Thread take-up device 101 Thread take-up support rod 103 Thread take-up tray 104 Take-up body 106 Activator 108 Take-up wheel (thread take-up member) 109 Activator 110 Mounting plate 112 Projection 120 Base plate 121, 122, 123 Activate Regulator plate 130 Winding stepping motor (drive source) 141, 142, 143 Operating plate 200 Thread selection and transport device 201 Feed screw 210 Feed stepping motor (drive source) 220 Moving table 221 Thread gripping part 222 Thread tension plate 223 Thread press plate 224 Thread Cutting Guide 225 Thread cutting blade 230 Moving table cover 231 Thread hook 232 Thread guide groove 234 Opening 240 Winding switching plate 250 Thread set table 251 Thread hook 252 First tension plate 254 First thread holding plate 256 Second tension plate 257 Second thread presser 260 Opening 262 Thread guide groove 263 Thread cutting blade 300 Threading means 302 Threading positioning stopper 305 Threading shaft 306 Threading lever 308 Threading hook holder 310 Operating pin 311 Groove cam 313 Threading hook 317 Stop part 325 Needle stop thread hook 330 Thread transfer and threading stepping motor 400 Needle swing mechanism 405 Needle swing stepping motor 500 Thread transfer means 501 Drive shaft 505 External operating body 506 Internal operating body 511 Thread push locking section 513 Rack gear 517 Thread passing Working gear 518 Thread transfer arm (thread transfer member) 519 Thread retainer 522 Projection 523 Lock pin 533 Switching body 538 Contact plate 539 Lever 541 Support roller 542 Thread transfer guide plate 543 Operation hook 576 Wire 577 Roller 578 Switching operation body 579 Switching plate 580 Thread transfer gripping portion (thread catching portion) 581 Thread presser 583 Thread guide 584 Guide groove 586 Thread guide shaft 600 Threading means 601 Thread feeding stepping motor 602 Thread feeding roller 605 Intermediate gear 605a Second intermediate gear 606 Thread feed swing plate 611 Auxiliary roller 613 Thread take-up operation gear 614 Thread take-up first arm 615 Thread take-up second arm 616 Thread take-up hook 624 Guide path 626 Thread take-up engaging groove 635 Thread take-up stopper plate 640, 642 Base tension plate 654 Thread break Detection means

Claims (5)

[Claims] 1. A sewing machine provided with an automatic threading and threading device for transferring an upper thread drawn from a thread spool and inserting the thread into an eye of a sewing needle, a thread supply source capable of setting a plurality of thread spools, It has a plurality of thread grippers each holding an upper thread pulled out from each of a plurality of thread spools set in the thread supply source, and the plurality of thread grippers are selectively provided to the automatic threading / threading device. And a thread selecting and transporting device capable of transporting the thread so as to catch the thread. 2. The thread supply source is rotatable around a bobbin, retracts to a position where the flow of a thread drawn from the bobbin is not obstructed during sewing, and changes a posture in a direction substantially perpendicular to the bobbin when winding the bobbin. Providing a yarn winding member
The sewing machine according to claim 1, wherein: 3. A yarn winding device having a yarn winding member and a driving source for driving the yarn winding device, wherein the yarn winding device and the yarn selecting and conveying device are unitized to be separable from a sewing machine main body. 3. The sewing machine according to claim 2, wherein: 4. The yarn selecting and conveying device further comprises a pair of upper and lower tension applying portions for holding the upper thread in an up-down direction in each of the plurality of yarn gripping portions. The sewing machine according to claim 1. 5. A sewing machine provided with an automatic threading and threading device for transferring an upper thread drawn from a thread spool and inserting the thread into an eye of a sewing needle, wherein the automatic threading and threading device includes an upper portion of the sewing machine. A thread transfer member having a yarn catching portion for transferring the upper thread captured from the needle to the needle hole, and a variable presser capable of changing the thread presser pressure of the yarn catching portion to open, strong, or weak depending on the position of the thread transfer member. A sewing machine comprising a pressure means.