JPH11235491A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized thread winding device corresponding to thread exchanging of a sewing machine having an automatic thread putting/ inserting device. SOLUTION: A sewing machine is provided with automatic thread putting/ inserting devices 300, 500 and 600, which convey an upper thread drawn from a thread feeding side for inserting into an eyelet of a sewing needle N. Two thread spools 101 and 102 can be set on the sewing machine, and the sewing machine is provided with a thread winding device 100, which can wind each upper thread drawn from the two thread spools 101 and 102 set on the sewing machine, and a control device, which can insert the upper thread drawn from one of two thread spools 11 and 12 into the eyelet of the sewing needle N by the automatic thread putting/inserting devices 300, 500 and 600 based on a thread exchanging signal, and controlling thread winding operation of the other of the two thread spools 11 and 12 by the thread winding device 100.

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 larger frame by increasing the number of threads, a larger space is required.For example, it is difficult to install it on a household sewing machine from the viewpoint of appearance. there were.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine provided with a small-sized yarn winding device while coping with yarn exchange.

[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, a thread winding device capable of setting at least two thread windings and capable of winding the upper thread drawn out from one or the other of the two thread windings to a sewing needle by rotating the thread winding. The upper yarn pulled out from one of the two yarn windings is operated by the yarn winding device on the basis of the yarn exchange signal, and the other of the two yarn windings is wound by the automatic yarn hooking / threading device. And a control device for inserting the sewing needle through the eye hole of the sewing needle.

Here, as an automatic threading / threading device, the upper thread in the way thread is gripped and transferred so as to protrude near the eye of the sewing needle, and the transferred upper thread is fed to the sewing needle. However, the configuration of the drive source and the mechanism for threading and threading are arbitrary. The yarn winding device is
It is a small one placed above the sewing machine. The control device includes a microcomputer, a ROM, a RAM, an I / O port, and the like.

As described above, according to the first aspect of the present invention, at least two thread windings can be set, and the upper thread drawn from one or the other to the sewing needle can be wound by rotating the thread winding. The upper thread from one of the two spools is wound by the spooler based on the thread change signal, and the other of the two spools is sewn by the automatic threader / threader. A sewing machine with an automatic threading and threading device equipped with a control device to be inserted into the eye of the needle, so two thread spools are set,
By automatically threading and threading the upper thread from one thread spool, winding the thread into the other thread spool and replacing it with another thread spool, it is possible to wait for the next automatic thread threading and threading. In addition, since only a yarn winding device for setting two yarn windings is provided, the size becomes small.

According to a second aspect of the present invention, there is provided the sewing machine according to the first aspect, wherein the yarn winding device includes two yarn guiding portions for respectively guiding yarns drawn from the two yarn windings, The two thread guides are positioned substantially in front of the bobbin that is pulled out from the bobbin so that the thread is loosened during sewing, and positioned at the side of the bobbin where the thread is wound around the rotating bobbin at the time of bobbin winding. And a winding switching mechanism for alternately performing a switching operation.

As described above, according to the second aspect of the present invention, the yarn winding device according to the first aspect includes two yarn guiding portions for guiding yarns from two yarn windings, respectively, and the two yarn guiding portions.
The individual thread guides are alternately positioned so that they are positioned almost in front of the bobbin that is pulled out of the bobbin so that the thread is unraveled during sewing, and are positioned on the side of the bobbin where the thread is wound around the rotating bobbin when the bobbin is wound. Since the sewing machine has a winding switching mechanism for performing a switching operation, the thread can be pulled out so as to be loosened from the thread during sewing, and the thread can be easily wound around the rotating thread when winding the thread.

According to a third aspect of the present invention, there is provided the sewing machine according to the second aspect, wherein the winding switching mechanism transmits rotation power to two spool supporting rods on which the two spools are respectively set. A power transmission switching member that performs cutoff, and a switching operation member that causes the two yarn guides to alternately perform the switching operation and drive the power transmission switching member by driving an actuator. Configuration.

Thus, according to the third aspect of the present invention, the winding switching mechanism according to the second aspect includes a power transmission switching member that transmits / cuts off rotational power to two thread winding support rods, The sewing machine has a switching operation member for switching the two yarn guide portions alternately by driving the actuator and for switching the power transmission switching member, so that the two yarn guides are driven by one actuator. In addition to switching the parts alternately, transmission and cutoff of rotational power to the two thread winding support rods can be performed.

According to a fourth aspect of the present invention, there is provided the sewing machine according to the first, second or third aspect, wherein the yarn winding device includes:
It is characterized in that a thread path space is provided so that the thread being sewn and the thread being threaded by the threading / threading device and threading standby are not in contact with each other.

As described above, according to the fourth aspect of the present invention, the thread being sewn and the thread being thread-standby and thread-waiting do not come into contact with the thread winding device according to the first, second or third aspect. Since the sewing machine is provided with the sectioned thread path space, the thread being sewn and the thread that is waiting for threading is not entangled with the thread being sewn, so that sewing failure does not occur.

[0014]

DETAILED 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.
1 is a schematic perspective view showing an automatic threading / threading device and a thread winding device of an embroidery sewing machine as an example of a sewing machine to which the present invention is applied, and FIGS. 2 to 14 are views showing details of respective parts.

First, as shown in FIG. 3, an upper shaft 1 is a main motor (not shown) (see sewing machine motor 90 in FIG. 18).
The upper shaft shield 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 the main shaft sensor 91 in FIG. 18). , 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 is provided a yarn winding device 100 as a yarn supply source capable of selectively replacing a plurality of upper colors of different colors. The thread winding device 100 is disposed above the sewing machine as shown in FIG. 1, and includes two thread winding support rods 101 and 102 as shown in an enlarged manner in FIG. The two thread winding support rods 101 and 102 are arranged parallel to the upper shaft 1 and parallel to each other, and as shown in FIG. 14, a mounting plate 103 fixed to a frame (not shown) (only a bearing portion is shown).
It is rotatably mounted on. This thread supporting rod 1
01 and 102 are provided with thread winding stoppers 105 and 106, respectively. This thread winding stopper 105, 1
06 is a spool supporting rod 101, as shown by a virtual line.
When the spools 11 and 12 are mounted on the spool 102, the spools 11 and 12 have a function of applying pressure so that the spools 11 and 12 do not rotate on the spool supporting rods 101 and 102, respectively.

The switching cams 111, 108 are respectively attached to the bobbin supporting rods 101, 102 by pins 107, 108, respectively.
The switching cam 11 is provided slidably.
The compression coil springs 113 and 114 urge the spools 1 and 112 in directions opposite to the respective thread windings 11 and 12. Further, operating gears 115 and 116 are rotatably attached to the bobbin supporting rods 101 and 102, respectively. Driving gears 117 and 118 meshing with the operating gears 115 and 116 are fixed to a driving shaft 119. The driving shaft 119 is provided with rotational driving forces from a line winding stepping motor 120 as actuators as gears 121 and 122. Is transmitted via

The switching cams 111 and 112 have projections 1.
11a, 112a are formed, and the operating gear 115,
The protrusion 116a is also formed at 116,
When the switching cams 111 and 112 move in the direction of the operating gears 115 and 116, the respective protrusions 111a and 112a come into contact with the protrusions 115a and 116a, respectively. The two switching plates 12 forming the power transmission switching member
3,124 are provided. The switching plates 123, 12
4, one end is urged by the respective torsion coil springs 125 and 126 in a direction to contact the switching cams 111 and 112, respectively, and the other end is in contact with the stopper 104 provided on the mounting plate 103, respectively. Note that the spring pressure of the torsion coil springs 125, 126 causes the compression coil springs 113, 114 to bend and the switching cams 111, 1 to change.
12 and the operating gears 115 and 116 are set so as to be separated from each other without being brought into contact with each other.

Furthermore, the two yarn guide arms 131, 13
2 are provided. These thread guide arms 131, 132
Are also rotatably mounted on the mounting plate 103 and are urged counterclockwise by torsion coil springs 133 and 134. Further, the yarn guide arms 131, 1
The operating shafts 135 and 136 are provided at 32 by caulking. The thread guide arm 13
The thread guides 131a and 132a are formed at the distal ends of the thread guides 1 and 132. The thread guides 131a and 132a are formed in circular holes 31 and 32 formed in a sewing machine top cover (not shown).
(See the virtual line in the figure). The thread guides 131a and 132a are connected to the respective thread winding support rods 10a.
1 and 102, the yarn guide 132a on the near side in the figure is closer to the yarn guide 13 on the far side in the figure.
It faces a position higher than 1a. And the yarn guide 13
In the vicinity of 1a and 132a, as shown by the imaginary lines, the thread path spaces 35, which are respectively surrounded by the thread holding walls 33 and 34 provided on the sewing machine top cover and on one side,
36 are formed respectively. This thread path space 3
5 and 36, the yarns pulled out from each of the bobbins 11 and 12 form base tension plates 640 and 64 to be described later.
The two yarns do not come into contact until they are hooked.

An operation plate 141 as a switching operation member is provided. The operation plate 141 is slidably attached to the attachment plate 103. And this operating plate 1
Reference numeral 41 denotes an upright piece 1 that contacts the switching plates 123 and 124.
42, the operation shaft 135 of the yarn guide arms 131 and 132,
136 are formed with protruding pieces 143 and 144 respectively contacting with each other. Further, a rack 145 is formed on the operation plate 141. The rack 145 is engaged with a gear 151 of the line winding switching stepping motor 150 as an actuator. Thus, the yarn winding device 100 including the winding switching mechanism is configured.

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 which will 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.

Further, a threading shaft 305 is mounted on the needle swinging swing table 401 substantially in parallel with the needle bar 5 so as to be rotatable and vertically movable. 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 is formed at an intermediate portion of the threading lever 306 so as to project toward the back side of the sewing machine. 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 to 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 vertically. 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 push 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 disposed near the side of the external moving body 505 so as to rise substantially at a right angle. A regulating shaft 515 erected on an internal operating body 506 is vertically movable into a long vertical groove 514 formed in the rack gear 513 so as to protrude substantially horizontally on the side of the external moving body 505. It is loosely fitted. By the guiding action based on such a configuration, the external moving body 505 is guided to move up and down without rotating.

Further, 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.

The yarn transfer arm 518 is connected to the yarn transfer operation gear 5.
A first thread transfer arm 518a extending in a direction substantially orthogonal to the thread transfer shaft 516 from the base side on the 17th side; and the upper shaft bent at a substantially right angle from the extension end side of the first thread transfer arm 518a. Yarn passing second arm 51 extending substantially parallel to 1
8b. As shown in FIG. 1, a bifurcated threaded board 5 is provided at the distal end of the thread transfer second arm 518b.
25 are provided. Between the thread tension plate 525 and the thread transfer gripping portion 526 provided at an intermediate portion of the thread transfer second arm portion 518b, the distal end portion of the upper thread A pulled out by the thread transfer means 200 is substantially linear. It is being passed over.

The thread transfer gripping portion 526 includes an upper pressing plate 527 formed so as to protrude toward the near side (the right side in FIG. 12) from an intermediate portion of the second thread transferring second arm portion 518b, and an upper pressing plate 527. Presser plate 528 pressed against the lower surface of
And A compression coil spring 531 for applying pressure is mounted on a holding shaft 529 extending upward from the lower holding plate 528 through the upper holding plate 527. The upper and lower pressing plates 527 and 528 are brought into close contact with each other by the axial biasing force of the compression coil spring 531 for applying pressure.

A pressure adjusting plate 532 is interposed between the pressure applying compression coil spring 531 and the upper holding plate 527. By reciprocating the pressure adjusting plate 532 in the axial direction of the holding shaft 529, the axial compressive force of the compression coil spring 531 for applying pressure is adjusted. This allows
The configuration is such that the adhesion between the upper and lower holding plates 527 and 528 is changed to adjust the gripping force of the upper thread.

More specifically, as shown in FIG. 1, the pressure adjusting plate 532 is provided with a thread transfer second arm portion 518 from a portion between the pressure applying compression coil spring 531 and the upper holding plate 527.
b extends along the inner surface side. A base end portion on the extension side is rotatably attached to a side surface of the thread transfer first arm portion 518a. On the other hand, as shown in FIG. 1, on the base side portion of the thread transfer first arm portion 518a,
A substantially U-shaped thread gripping bracket 533 is provided so as to be close to the thread passing operation gear 517, and the thread passing first arm portion 51 is provided.
It is rotatably mounted around a thread passing adjustment shaft 534 that extends substantially parallel to the thread passing shaft 516 that is the rotation axis of 8a.

The thread gripping bracket 533 and the pressure adjusting plate 53
2 is two link arms 53 constituting a link mechanism.
5, 536 so as to be linked with each other. Then, the pressure-applying compression coil spring 531 is compressed in the axial direction by the rotational urging force of the torsion coil spring 537 attached to the yarn passing adjustment shaft 534 that is the rotation axis of the yarn gripping bracket 533, and the urging force is strengthened. Thus, the upper and lower holding plates 527 and 528 are strongly pressed against each other.

As shown in FIG. 12, when the yarn transfer first arm portion 518a extends upward due to the yarn transfer operation gear 517 being at the uppermost position, the yarn transfer first arm When the thread transfer locking plate 538 provided on the portion 518a comes into contact with the upper surface of the thread gripping bracket 533, the rotation of the thread gripping bracket 533 is stopped in the state shown in FIG. Thus, the compression amount of the compression coil spring 531 for applying pressure is suppressed, and the pressing force of the upper and lower holding plates 527 and 528 is reduced.

As the yarn transfer operation gear 517 rotates, it lowers slightly from the uppermost position shown in FIG.
When the thread transfer first arm 518a rotates by a predetermined amount and tilts as shown by a two-dot chain line in the middle, the thread transfer locking plate 538 provided on the thread transfer first arm 518a is attached to the thread gripping bracket. By separating from the upper surface of 533, the thread gripping bracket 533 is rotated by the rotational urging force of the torsion coil spring 537. Thus, by compressing the pressure applying compression coil spring 531 in the axial direction, the upper and lower pressing plates 527 and 528 are strongly pressed against each other.

Further, a thread transfer swing lever 539 protruding from the thread transfer shaft 516 on the opposite side is integrally provided on the thread transfer first arm 518a. A support roller 541 is rotatably attached to a distal end portion of the thread transfer swing lever 539, and is configured to swing integrally with the rotation of the thread transfer operation gear 517.

On the other hand, a yarn transfer guide plate 542 for guiding the support roller 541 provided on the yarn transfer swing lever 539 is fixed so as to be adjacent to the side of the rack gear 513. 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 thread transfer swing lever 539 abuts on the upper side linear guide portion 542a provided so as to protrude toward the front side of the sewing machine (the right side in FIG. 12), whereby the thread transfer first arm is provided. The portion 518a is the yarn transfer operation gear 5
In spite of the rotation of 17, it is locked at the rotation position that protrudes obliquely downward. Note that the guide portion 542a is not limited to a linear shape, and may have any shape such as a curve as long as the above-described object is achieved. Further, a thread transfer swing lever 5 is provided on a lower linear guide portion 542b provided to be slightly retracted on the back side of the sewing machine (left side in FIG. 12).
By contact of the 39 support rollers 541, the yarn transfer first arm portion 518a is rotated slightly downward. Thereby, the thread transfer first arm portion 518a is
Regardless of the rotation of the thread transfer operation gear 517, as shown by a two-dot chain line in FIG. 12, the gear is locked at a rotational position that hangs vertically downward.

Here, an operation hook 543 is provided integrally with the thread gripping bracket 533 so as to extend outward in the radial direction. As described above, when the thread transfer first arm portion 518a rotates to the lowermost position (FIG. 1).
2 (see the two-dot chain line), the positional relationship is set so that the operation hook 543 can ride on the radially leading end of the protrusion 522 provided on the thread transfer operation gear 517. The operation hook 543 is connected to the yarn transfer operation gear 51.
7, the thread gripping bracket 533 is rotated by the amount of the ride. Thereby, the compression coil spring 531 for applying pressure is provided.
Is suppressed, and the pressing force of the upper and lower holding plates 527 and 528 is weakened.

In addition, a thread cutting cutter 550 is disposed near the thread transfer grip 526 as shown in FIG. With this thread cutting cutter 550, the thread transfer gripper 52
It is configured to cut the tip portion of the upper thread held by 6. That is, the thread cutting cutter 550 is used to cut the remaining thread after the thread is set on the thread transfer arm 518, and is attached to a sewing machine top cover (not shown).

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 provided. 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 presser lifting mechanism (not shown) or a thread feeding swinging 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.

A pair of auxiliary rollers 611 and 611 are rotatably mounted on the auxiliary roller mounting plate 608 so that the auxiliary rollers 611 and 611 are brought into 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 middle portion 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 to the lower end portion 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 take-up bracket 619 is held at the lower end position described above by the tension of the tension 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 rotation 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 such 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.

Next, a description will be given of a threading operation and a thread hooking operation of a new upper thread performed by the apparatus configured as described above. When setting the upper thread on the thread winding device 100 and threading the thread, the sewing machine
The thread winding 11 is set on the thread winding 11, the thread pulled out from the thread winding 11 is hooked on the thread guiding portion 131 a of the thread guiding arm 131, and then held by the thread passing holding portion 526 of the thread passing means 500. In this way, the upper thread held by the thread transfer gripping portion 526 of the thread transfer means 500 is cut by the thread cutting cutter 550. The length of the upper thread that hangs from the thread transfer gripping portion 526 after cutting is set to a length that allows the threading means 300 to perform a threading operation on the sewing needle N in a satisfactory manner. That is, if the length is too long, the upper thread cannot completely pass through the eye of the sewing needle N. If the length is too short, the upper thread is not sewn when the sewing operation is started after the threading. This is because the needle N comes out of the eye hole.

On the other hand, a lifting mechanism (not shown)
By operating the automatic thread trimmer, the thread feeding rocking plate 606 of the thread hooking means 600 is moved, and the thread feeding roller 602 is operated.
The auxiliary rollers 611 and 611 are separated from the
The thread take-up operation gear 613 meshes with the second intermediate gear 605a of the intermediate gear 605. At the same time, the needle take-off stepping motor 405 controls the thread take-up stopper plate 63.
5 to allow the second arm 615 to rotate.

Then, 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.

Next, a stepping motor (not shown, reference numeral 330 in FIG. 18) for thread transfer and threading, which is not shown, is driven to rotate forward for a predetermined number of steps, whereby the drive shaft 501 is rotated and the internal operating body is rotated. 506
At the same time, the external operating body 505 descends. As a result, the thread transfer arm 518 descends while rotating together with the rack gear 513, and the thread transfer gripper 526 of the thread transfer arm 518 descends while holding the upper thread so as to fall down toward the sewing machine.

When the thread transfer arm 518 falls down at a predetermined angle, the thread transfer locking plate 538 is disengaged from the upper surface of the thread holding bracket 533, so that the upper and lower pressing plates 527 and 528 constituting the thread transfer holding section 526 are moved. In a state where the upper thread is strongly held in contact with each other and the upper thread is strongly held, the subsequent lowering operation is performed without causing the thread to fall off.

Further, when the drive shaft 501 is rotated and the external operating body 505 descends together with the internal operating body 506, the support roller 541 provided on the yarn passing swing lever 539 moves to the upper part of the yarn passing guide plate 542. Side linear guide 54
2a, the thread transfer arm 518 descends with the rotation stopped at a position where the thread transfer arm 518 does not contact other members. 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.

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, whereby 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 thread transfer swing lever 539 abuts on the lower linear guide portion 542b.
As a result, the thread transfer grip 526 rotates to a region inside the sewing needle N (see a two-dot chain line in FIG. 12), and the upper thread tensioned between the thread transfer grip 526 and the thread tension plate 525. A
Is arranged in front of the eye of the sewing needle N. At this time, the operation hook 543 of the thread gripping bracket 533 rides on the radially leading end of the protrusion 522 provided on the thread transfer operation gear 517. Thereby, the yarn gripping force in the yarn transfer gripping portion 526 is weakened.

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. As a result, the threading shaft 305 rotates together with the threading hook holder 308, and the threading hook 313 penetrates the eye of the sewing needle N, hooks the upper thread, and performs a return operation. Will be At this time, the needle stopper thread hook 325 holds the thread guide 1 of the needle stopper 9 in a state where the upper thread is hooked on the distal end portion.
Since the upper thread is passed through 0, the supply path of the upper thread is formed well. Before the threading operation is performed,
When the operation pin 310 moves along the vertical groove cam 311b, the threading shaft 305 is lowered by a predetermined amount without rotating. This takes into account variations in the stop position of the upper shaft 1.

Also, as in the present embodiment, the threading means 3
By separately arranging the operating portion of the threading device 500 and the operating portion of the thread transferring means 500, the threading operation can be performed after the thread transferring operation is enabled by the thread transferring device 500. The threading operation can be performed more stably than when the operations are performed simultaneously. In particular, in the present embodiment, as described above, before the threading operation is performed in consideration of the variation in the stop position of the upper shaft 1, the threading shaft 30
5 is slightly lowered, it is preferable to separate the operating part of the threading means 300 from the operating part of the thread passing means 500. Otherwise, a device for detecting the position of the threading shaft 305 with a sensor is required.

When the thread take-out hook 616 is moved downward by the reverse rotation of the thread paying-out stepping motor 601 and the middle part of the upper thread is hooked, the upper thread upstream from the thread take-up hook 616 on the thread winding side 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 needle swing 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.

Next, when the internal operating body 506 is raised by reversing the drive shaft 501, the threading shaft 305 is reversed and the sewing needle N is held in a state where the threading hook 313 hooks the upper thread. Threading is performed. Immediately after this threading operation is performed, the upper thread is released, so that the threading hook 3
13 can be avoided. Further, when the inner operating body 506 comes into contact with the outer operating body 505 and rises integrally, the thread transfer gripping portion 526 from which the upper thread has come off rotates while rising, and stops in a standby state. Thereby, a series of threading operation and threading operation are completed.

Although not shown, the embroidery sewing machine with the thread changing device described above is provided with a front panel for various operations. The front panel has an operation panel for threading as shown in FIG. 70 are provided.
As shown, the operation panel 70 for thread hooking is provided with a thread hooking start switch (A) 71, a thread hooking start switch (B) 72, a continuous instruction switch 73, a continuous release switch 74, and a continuous instruction by LED. A display unit 75 is provided. Note that the continuous release switch 7
3 may also be used.

FIG. 18 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 76, 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 120, 150, 330, 601 and 405 is connected to each of the drive circuits 82, 83, 84, 85, 86. Connected through. The key matrix 76 includes the threading start switches 71 and 72, the continuous instruction switch 73, the continuous release switch 74, and the like.

Next, the operation in the case of sewing embroidery using the upper thread of three colors will be described. First, an operator selects a desired embroidery using an embroidery operation panel (not shown), and then sets the spool 11 to be sewn on the spool supporting rod 101 first. The yarn pulled out from the yarn winding 11 is hooked on the yarn guide portion 131a of the yarn guide arm 131, and the yarn transfer means 5
After setting the thread in the thread transfer gripping portion 526 of 00, the excess thread held in the hand is cut by the thread cutting cutter 550. Then, the threading start switch (A) 71 is pressed. Then, as described above, the threading / threading device performs threading at a predetermined position and threading of the sewing needle N through the eye hole, and the thread transfer gripping portion 526 of the thread transfer means 500 returns to the original position. Return.

Thereafter, when a sewing machine start switch (not shown) is pressed, the sewing of the first color thread is started. Here, the operator sets the second spool 12 on the spool supporting rod 102, hooks the thread drawn from the spool 12 on the thread guide 132 a of the thread guide arm 132, After setting the thread on the thread transfer gripper 526,
After the surplus yarn held by the hand is cut by the thread cutting cutter 550, the continuous instruction switch 73 is pressed. By doing so, the sewing of the first color thread is completed, the first color thread is wound around the spool 11, and then the second color thread is automatically hooked into the eye hole of the needle, and the second color thread is threaded. The sewing of the thread can be automatically started.

When the sewing of the first color thread is completed, the first color thread is cut by an automatic thread cutter (not shown). At this time, the sewing machine emits a buzzer to notify the operator that the sewing of the first color thread has been completed. 1
After the second color yarn has been cut, the yarn winding switching stepping motor 150 is driven to drive the gear 151 and the rack 145.
The operation plate 141 is moved forward from the state shown in FIG. 14 to the state shown in FIG. Then, the protruding piece 1
When the operating shaft 135 is pushed by 43, the thread guide arm 131 rotates clockwise in the drawing, and the thread guide portion 131a is located beside the thread spool 11.

At the same time, the switching plate 123 is also pushed by the standing piece 142 and rotates clockwise in the figure, and the switching cam 111 moves in the direction of the operating gear 115 by the force of the compression coil spring 113. In this state, when the yarn winding stepping motor 120 is driven, the gears 121 and 122 are engaged with each other via the drive shaft 119 and the drive gear 117 and the operating gear 115.
The projection 111a of the switching cam 111 and the projection 115a of the operation gear 115 are brought into contact with each other, and the thread winding support rod 101 rotates. Accordingly, the bobbin 11 on the bobbin supporting rod 101 also rotates, and the yarn in the yarn path is wound up by the bobbin 11. Note that the projection 112 of the other switching cam 112
a and the projection 116a of the operating gear 116 are separated,
The bobbin supporting rod 101 does not rotate, and only the operation gear 116 meshing with the drive gear 118 on the drive shaft 119 rotates.

When the winding of the first color yarn is completed, the yarn hooking operation is started as described above, and the second color yarn set in the yarn transfer gripping portion 526 of the yarn transfer means 500 is automatically threaded. The thread is threaded and the sewing of the second color thread automatically starts.

Then, the operator takes out the spool 11 of the first color thread from which the thread has been wound from the spool supporting rod 101, and
The spool 11 of the third color thread is set on the spool supporting rod 101, and the thread drawn from the spool 11 is threaded on the thread guide portion 131a of the thread guide arm 131 as described above. After setting the yarn in the grip portion 526, the surplus yarn is cut by the yarn cutting cutter 550.
This operation does not have to be performed immediately after the first color thread has been wound, and may be any time while the second color thread is being sewn.

When the sewing of the second color thread is completed, similarly,
After the third color thread is threaded and threaded, sewing of the third color thread is automatically started.

When the operation plate 141 is moved backward, contrary to the above, the state shown in FIG. 14 changes to the state shown in FIG. Note that the yarn winding operation involving the above switching operation is performed by the control device 80, and specifically,
Based on a thread exchange signal generated by pressing any of the threading start switches 71 and 72, the two thread windings 11,
12 is inserted through the eye of the sewing needle N by an automatic threading / threading device (threading means 300, threading means 500 and threading means 600). The other of 11 and 12 is operated by the yarn winding device 100 for winding the yarn.

As described above, according to the present invention, the following effects can be obtained. (1) When the thread to be sewn is set next, the thread hooking, threading, and sewing start are automatically performed, so that it is possible to reduce the number of machine stop states waiting for thread replacement. (2) Thread guides 131a, 13 during sewing and winding of thread
Since the thread winding device 100 changes the position of the thread winding 2a, the upper thread can be pulled out from any of the thread windings 11 and 12 during sewing. (3) Since the operations of the two thread guide arms 131 and 132 and the thread winding support rods 101 and 102 are switched by one stepping motor 150, the cost can be reduced. (4) Since the thread being sewn is partitioned into separate thread path spaces 35 and 36 so that the thread being sewn does not come into contact with the thread which is waiting for threading, the thread being sewn is entangled with the thread being sewn and sewn. No defects occur. (5) Since only the two thread winding support rods 101 and 102, a driving device therefor and a winding switching mechanism are provided, a small thread winding device 100 can be provided.

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.

[0087]

As described above, according to the sewing machine according to the first aspect of the present invention, two thread spools are set, the upper thread from one thread spool is automatically threaded and threaded, and the other thread spool is threaded. By winding the thread around the bobbin and replacing it with another bobbin, it is possible to wait for the next automatic threading and threading, and because it only has a small bobbin winding device that sets two bobbins. Thus, downsizing of the sewing machine as a whole can be achieved.

According to the sewing machine according to the second aspect of the present invention, in addition to the effects obtained by the first aspect of the present invention,
During sewing, there is an advantage that the thread can be pulled out so as to be loosened from the thread winding, and that at the time of winding the thread, the thread can be easily wound around the rotating thread winding.

According to the sewing machine according to the third aspect of the invention, in addition to the effects obtained by the second aspect of the invention,
With one actuator, the two thread guides can be alternately switched, and the rotation power can be transmitted to and interrupted from the two thread winding support rods, thereby reducing the cost. The advantage that it can be obtained is obtained.

According to the sewing machine according to the fourth aspect of the invention, in addition to the effects obtained by the first, second or third aspect of the present invention, the thread being sewn and the thread which is waiting for threading is entangled with the thread being sewn. Thus, there is obtained an advantage that sewing failure does not occur.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an automatic threading / threading device and a thread winding 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 of FIG. 1;

FIG. 14 is a plan view showing a winding switching mechanism in the yarn winding device of FIG.

FIG. 15 is a plan view showing a state in which the operation plate is moved backward from the state shown in FIG. 14;

FIG. 16 is a plan view showing a state in which the operation plate is advanced from the state of FIG. 14;

FIG. 17 is a front view showing an operation panel for threading provided in the sewing machine.

FIG. 18 is a control block diagram of the sewing machine.

[Explanation of symbols]

A Needle thread N Sewing needle 1 Upper shaft 5 Needle bar 8 Balance 9 Needle stopper 10 Thread guide 11,12 Thread winding 35,36 Thread path space 70 Threading operation panel 71,72 Threading start switch 73 Continuous indication switch 74 Continuous release switch 75 Continuous indication section 80 Control device 90 Sewing machine motor 100 Thread take-up device 101, 102 Thread winding support rod 111, 112 Switching cam 113, 114 Compression coil spring 115, 116 Operating gear 117, 118 Drive gear 119 Drive shaft 120 Thread winding Picking stepping motor (actuator) 123, 124 Switching plate (power transmission switching member) 125, 126 Torsion coil spring 131, 132 Thread guide arm 131a, 132a Thread guide portion 133, 134 Torsion coil spring 135, 136 Operating shaft 141 Operating plate ( Switching operation member) 145 rack 150 thread take-up switching stepping motor (actuator) 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 portion 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 Externally actuated body 506 Internally actuated body 511 Thread push locking section 513 Rack gear 517 Thread transfer Operating gear 518 Thread transfer arm 522 Projection 523 Locking pin 526 Thread transfer gripper 527 Upper holding plate 528 Lower holding plate 533 Thread holding bracket 538 Thread transfer locking plate 539 Thread transfer swing lever 542 Support roller 543 Operating hook 550 Thread cutting cutter 551 Operating cam 600 Threading means 601 Threading stepping motor 602 Threading roller 605 Intermediate gear 605a Second intermediate gear 606 Threading swing plate 611 Auxiliary roller 613 Threading operating gear 614 Threading first Arm 615 Threading second arm 616 Threading hook 624 Guide path 626 Threading engaging groove 635 Threading stopper plate 640, 642 Base tension plate 654 Thread breakage detecting means

Claims (4)

[Claims] 1. A sewing machine provided with an automatic threading and threading device for transferring an upper thread drawn from a bobbin and inserting it into an eye of a sewing needle, wherein at least two bobbins can be set. A thread winding device capable of winding the upper thread drawn out from one or the other of the two thread windings to the sewing needle by rotating the thread winding, and being pulled out from one of the two thread windings based on a thread exchange signal. A control device for causing the upper thread to be wound by the thread winding device and for the other of the two thread windings to be inserted into the eye of the sewing needle by the automatic threading and threading device. A sewing machine. 2. The thread winding device according to claim 1, further comprising: two thread guides for respectively guiding the threads drawn from the two thread spools; and for the two thread guides, a thread is wound from the thread during sewing. A winding switching mechanism that is positioned substantially in front of the axis of the bobbin that is pulled out so as to be unraveled, and that alternately performs a switching operation so as to be positioned at the side of the bobbin where the yarn is wound around the rotating bobbin at the time of bobbin winding. The sewing machine according to claim 1, wherein: 3. A power transmission switching member for transmitting / cutting off rotational power to two thread winding support rods on which the two thread windings are respectively set, and a power transmission switching member, 3. The sewing machine according to claim 2, further comprising: a switching operation member that causes the two thread guides to perform the switching operation alternately and the switching operation of the power transmission switching member. 4. 4. The thread winding device according to claim 1, further comprising a thread path space partitioned so that a thread being sewn does not come into contact with a thread which is being threaded by the threading / threading device and is in a standby state. The sewing machine according to claim 1, 2 or 3, wherein