JPH1052584A - Thread tension device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an appropriate thread tension pressure when a thread is exchanged. SOLUTION: By the thread of what order embroidery is to be performed is specified based on a color code in embroidery data, this thread tension device and a thread take-up spring device are moved to a withdrawal position, a thread passage is formed and thread passing is executed (S310-S370). Then, after opening the thread passage, the thread tension device and the thread take-up spring device are moved to a fixed position for embroidery execution (S420-S460), a thread tension pressure table is retrieved corresponding to the number of the thread, a motor is driven while confirming the output of a potentiometer and the thread tension pressure of the thread tension device is adjusted to an appropriate value (S470 and S480). For the thread tension pressure table, prescribed pressure values are set for the respective threads as default values beforehand, the pressure of the thread tension device is adjusted before the embroidery or in the middle of the embroidery, a thread tension pressure setting switch 724 is pressed and contents are updated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread tension device for a sewing machine.

[0002]

2. Description of the Related Art
In the embroidery sewing machine, a multi-needle sewing machine is used which is provided with a large number of balances and needle bars for performing multicolor sewing, and uses a thread drawn from a different thread spool through each balance and needle bar. ing.

[0003] In a sewing machine that performs such multicolor sewing, it is necessary to apply a different thread tension pressure for each thread. For this reason, in the conventional sewing machine as described above, it is necessary to provide a thread tension device for the number of yarns and to adjust in advance for each set yarn. For this reason, the number of thread tension devices is required for the number of yarns, resulting in a problem of an increase in parts.

Recently, instead of such a multi-needle sewing machine, an automatic sewing machine for providing multi-color sewing embroidery while automatically changing threads when a single needle is provided is provided. There is a proposal of a threading device (Japanese Unexamined Patent Publication No.
154453, JP-A-6-182077).

According to this apparatus, it is possible to provide only one thread tension device on the sewing machine head side, but conversely, it is not possible to realize an appropriate thread tension pressure for each thread as described above. There is a problem. Therefore, an object of the present invention is to enable an appropriate thread tension pressure to be quickly realized when a thread is replaced in a sewing machine.

[0006]

Means for Solving the Problems, Embodiments of the Invention and Effects of the Invention In the thread tension device of the sewing machine according to the present invention, the axis of an adjusting screw for adjusting the pressure of a disc presser spring for pressing a thread tension disc is slid. An actuator to be driven, a thread tension pressure information detecting means for outputting a signal corresponding to the pressure applied to the thread tension disc as a result of the sliding motion by the actuator, and an output signal from the thread tension pressure information detecting means, Control means for driving the actuator to adjust the thread tension pressure to a desired pressure.

According to this thread tension device, the pressing force of the thread tension plate can be adjusted to a desired pressure by driving the actuator by a desired amount by the control means.
Therefore, when setting the thread, it is not necessary to manually rotate the adjustment screw each time. In addition, if a condition corresponding to an appropriate thread tension pressure is given as a desired pressure, the control means can automatically adjust the thread tension pressure and execute embroidery or the like with an accurate thread tension pressure. This condition can be given numerically. In the manual adjustment of the thread tension pressure, it is absolutely necessary to rely on the feeling of the operator, and it is not possible to quickly adjust the thread tension pressure to an appropriate level unless the operator is an expert. If not, the thread tension pressure can be quickly adjusted to an appropriate pressure if the conditions are properly given.

Here, as a more specific configuration, for example, the thread tension information detection means can be constituted by a slide amount detection means for outputting a signal corresponding to a slide movement amount by the actuator. Also, for example, the actuator, the actuator,
A screw feed for forming a screw thread on the outer periphery of the shaft of the adjusting screw, engaging the screw thread with a support block having a screw hole to be fitted in the screw thread, and rotating the shaft of the adjusting screw. Means, and the slide amount detecting means can be constituted by a sensor for detecting a rotation amount of a shaft of the adjusting screw. The screw feed mechanism slides the adjusting screw while rotating the shaft. Then, by detecting the amount of rotation, it is possible to know the change in the length of the disc holding spring from the relationship with the pitch of the screw, and to grasp the pressure applied to the thread tension disc. Of course, the present invention is not limited to this. The stroke of the shaft may be directly detected by a potentiometer to determine the pressure applied to the thread tension plate, or a pressure sensor may be installed on the thread tension plate to directly measure the pressure. You may make it detect.

In the thread tension device for a sewing machine according to the present invention, the condition for adjusting the tension of the thread tension is stored in advance, and condition providing means for giving necessary control conditions to the control means based on the stored content is provided. By doing so, the thread tension pressure may be adjusted to a desired condition. By storing the conditions in advance, an appropriate thread tension pressure can be realized more quickly.

Here, the condition applying means includes a table in which a plurality of yarns are associated with a unique yarn tension pressure adjustment condition for each yarn, and a unit for specifying the yarn set in the yarn tension device. With this configuration, when the yarn is replaced, the optimum thread tension pressure can be automatically applied to the used yarn. As a result, in a multicolor sewing machine or the like, it is not necessary to provide the thread tension device for the number of threads, and the number of parts can be reduced.

In particular, in a thread tension device of a sewing machine which also includes these condition applying means, it is preferable to provide an updating means for updating the storage contents of the condition applying means. By means of this updating means, the thread tension pressure adjustment conditions are updated as necessary for each thread to be used, so that embroidery with various threads can be performed, and embroidery with a high taste can be performed using an optimal thread. It can be carried out with the tightening condition.

Hereinafter, embodiments of the present invention will be described in more detail based on an embodiment.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an overall configuration of an automatic threading and thread changing apparatus for an embroidery sewing machine as an embodiment will be described. As shown in FIG. 1, the automation device according to the embodiment includes a thread preparation device 100 disposed above the sewing head 1 and a threading device 400 disposed in front of the sewing head 1. In the description of the present embodiment, a case viewed from the direction of FIG. 1A is referred to as a front, and a case viewed from the direction of FIG.

Next, the yarn preparation device 100 will be described. The yarn preparation device 100 includes a plurality of cheese cases 210 for accommodating the upper thread spool 2, a transport tube 220 extended from the bottom surface of each cheese case 210, and a first guide nozzle to which the tip of each transport tube 220 is connected. 230,
Clamper 2 disposed below each first guide nozzle 230
40, a pair of feed rollers 250 arranged below the clamper 240, a cutter 260 arranged below the feed roller 250, and a second cutter arranged below the cutter 260.
A guide nozzle 272, one yarn detection sensor 280 disposed below the second guide nozzle 272,
A third guide nozzle 273, one of which is located below 80;
It comprises a thread tension device 300 and a fourth guide nozzle 274 arranged below the thread tension device 300.

As shown in an enlarged manner in FIG. 2, the cheese case 210 includes a base 211 formed with a screw hole for fixing to a thread stand (not shown), a case cover 213,
And a support member 214 for supporting the paper tube 212 of the upper thread spool 2. The base 211 is a cylindrical portion 211 extending upward at the center.
a and a base 211b extending downward from the center of the bottom surface of the cylindrical portion 211a. The original end 220a of the transfer tube 220 is connected to the base 211b.
As shown in FIGS. 3 and 4, the tip 220 b of the transfer tube 220 is connected to the base 2 at the upper end of the first guide nozzle 230.
30a.

Further, as shown in FIG.
14 is a paper core 2 after the spool 2 is placed on the base 211.
The base 211 is inserted through the upper end opening 212a of the base 12 and fitted into the cylindrical portion 211a of the base 211. The support member 214 has a through hole 214a that penetrates in the vertical direction at the center. Further, as shown in FIG. 2B, four horizontal arms 214b project from the upper end of the support member 214 at 90-degree intervals. At the tip and the root of the horizontal arm 214b, respectively,
Ceramic rings 214c and 214d are fixed. The rings 214c and 214d are for making the yarn 3 slippery. The upper end portion 214u of the through hole 214a extends in a funnel shape as shown in FIG.

An air vent hole 213a is provided at the center of the upper surface of the case cover 213. Reference numeral 215 in the figure denotes a felt table mounted on the base 211. Next, the configuration of a portion below the first guide nozzle 230 in the yarn preparation device 100 will be described.

The components below the first guide nozzle 230 include a base frame 110 and a slide block 1 disposed on the upper portion of the sewing machine head 1 as shown in FIGS.
20. As shown in FIG. 4, the slide block 120 employed in the present embodiment has a width to which 24 first guide nozzles 230 can be attached. 4, two guide rails 121 and 122 each having a U-shaped cross section are fixed in the horizontal direction on the back side of the slide block 120 in FIG. Further, a rack 123 is fixed to the slide block 120 in parallel with immediately below the upper guide rail 121. The above-mentioned guide rails 121 and 122 are attached to the device mounting block 13 fixed on the base frame 110.
It is engaged with the rails 131 and 132 fixed to zero.

The device mounting block 130 includes a motor 141, a pinion gear 142 rotated by the motor 141, and an idler for transmitting the rotation of the pinion gear 142 to the rack 123 as devices for slidingly driving the slide block 120. A gear 143 is attached. Also, the device mounting block 130
A single compressed air supply device 150 is attached to the upper part of the container in accordance with the height of the first guide nozzle 230. The compressed air supply device 150 includes an air cylinder 15
1 and the air cylinder 151 in the horizontal direction (FIG. 3).
The air supply head 152 which protrudes and disappears in the left-right direction of FIG.

Returning to the slide block 120 again. As shown in FIGS. 3 and 4, the slide block 120 is formed with a U-shaped horizontal groove 125 having an opening height and a depth capable of accommodating the driven roller 251 of the feed roller 250. . The horizontal groove 12
5 above and below each of the first guide nozzles 230, 24 vertical through holes 126,
127 are provided.

At the upper end of the upper vertical through hole 126, a recess 128 for accommodating the tip of the clamper 240 is provided as shown in an enlarged view in FIG. A cover plate 128 b having a small hole 128 a into which the horizontal rod 241 of each clamper 240 can be inserted is attached to the front side of the recess 128. A strip 129 having holes corresponding to the small holes 128a of the cover plate 128b is attached to the front surface of the cover plate 128b. The band plate 129 has vertically protruding ridges 129a and 129.
b is formed, and the small holes 128 of the cover plate 128b are formed.
24 circular holes 129c are formed in accordance with a.

Next, the configuration of the first guide nozzle 230 will be described. As shown in FIG. 5, the first guide nozzle 230 is provided with a trumpet-shaped base 230a at the upper end, and a vertical through hole 231 formed at the center of the shaft.
And a diagonal hole 232 that is open near the lower end of the front end.
The upper end of the vertical through hole 231 is connected to a trumpet-shaped base 220c of the transfer tube 220.
The oblique hole 232 is provided with the compressed air supply device 150 described above.
The horizontal hole 233 extending toward the air supply head 152 is continuously formed. When compressed air is supplied by bringing the air supply head 152 into close contact with the horizontal hole 233, the compressed air flows into the vertical through hole 231 through the oblique hole 232, and forms an airflow from the top to the bottom in the vertical through hole 231. I do. As a result, an airflow that tries to suck out the yarn from the cheese case 210 is also formed in the transport tube 220.

Next, the clamper 240 will be described.
As shown in FIG. 5, the clamper 240 is connected to the horizontal rod 2 inserted into the recess 128 through the circular hole 129c of the strip 129.
41, disks 243 and 244 provided at both ends of the horizontal rod 241, and a coil spring 245 disposed between the exposed side disk 244 and the horizontal plate 129 among the disks 243 and 244. And Horizontal rod 24
A vertical hole 246 is formed at one appropriate position.
The exposed side disk 244 is connected to the slide block 120.
, The rod 248 of the air cylinder 247 can be brought into contact with the rod 248 when the rod 248 is located immediately above the second guide nozzle 272 or the like. As shown in FIG. 4, only one air cylinder 247 is provided at a position indicated by a dashed line.

The horizontal rod 241 includes an air cylinder 247
When the air is supplied, the air cylinder 247 is pushed rightward, and the air cylinder 247 is exhausted, so that the air spring 245 is projected leftward by the restoring force of the coil spring 245. FIGS. 3 and 5 show a state where the clamper 240 is pushed in by the air cylinder 247.
When the horizontal rod 241 is in the protruding state, the vertical hole 246 is formed in the vertical through hole 2 of the first guide nozzle 230.
It is formed so as to be located immediately below 31. The rotation of the horizontal rod 241 is regulated by an appropriate method so that the vertical hole 246 always faces the vertical direction.

Next, the feed roller 250 will be described. The feed roller 250 includes a driven roller 251 and a drive roller 252. Driven roller 2
Reference numeral 51 denotes a metal roller having the same length as the width of the slide block 120, as shown in FIG. And
As shown in FIG. 6, the shaft 251a protruding from both ends is
It is supported by a support plate 253 that is bent in the shape of a “ku”. The support plate 253 supports the upper arm 25.
The slide block 12 at the fulcrum 253b in the middle of 3a
It is rotatably supported at zero. And the lower end 253
c, the roller 251 is pulled in a counterclockwise direction in the drawing around the middle fulcrum 253b by the coil spring 253d, thereby rotating the driven roller 251 toward the depth of the horizontal groove 125. .

A notch 253e is formed at the upper end of the support plate 253 so as to come into contact with a stopper pin 120a protruding from the slide block 120 so that the rotation position of the coil spring 253d is restricted. Immediately below the notch 253e, a receiver 253f of the air cylinder 254 is formed, and the cylinder rod 254a of the air cylinder 254 is in contact therewith. 3 and 6 show a state in which the air cylinder 254 is in an exhaust state. When the air cylinder 254 is in an air supply state, the support plate 253 is rotated clockwise in the drawing, and the driven roller 251 and the drive roller 252 are rotated. Is to be contacted.

The driving roller 252 is connected to the base frame 1
A motor 255 fixed on a plate 111 extending horizontally from the motor 10 rotates the motor through pulleys 256 and 257 and a belt 258. The drive-side roller 252 has a narrow width, as can be seen from FIG. 4, and is made of synthetic rubber.

The feed roller 250 is driven by setting the above-mentioned air cylinder 254 in a supply state.
By driving the motor 255 at a constant speed in this state, the yarn can be sent downward at a constant speed. The drive speed of the motor 255 can be arbitrarily controlled, and control can be performed such that the yarn feed speed is reduced when the yarn is passed through the needle hole.

Next, the cutter 260 will be described. As shown in FIGS. 3 and 6, the cutter 260 is arranged so as to face directly below the vertical through hole 127 below the slide block 120. The cutter 260 is a pair of scissors that cut the yarn by closing the two crossed blades 261 and 262, and the blade 260,
62 is configured to open when it is advanced, and to close when it is retracted.

Next, the second guide nozzle 272 to the fourth guide nozzle 274 will be described. As shown in FIG. 3, these guide nozzles 272 to 274 have the same configuration as the first guide nozzle 230, and blow compressed air from oblique holes so that the inside of the vertical through holes goes from top to bottom. It is configured to form an air flow and convey the yarn.

Next, the yarn detecting sensor 280 will be described. The thread detection sensor 280 is attached to the lower end of the through hole 112 formed in the horizontal plate 111, as shown in FIG. The yarn detection sensor 280 has a circular hole at the center, and is configured to output a detection signal when the yarn passes through the circular hole. The sensor may be of any type, and may be constituted by an optical sensor or the like.

The second guide nozzle 272 to the fourth guide nozzle 274 and the yarn detection sensor 280 are shown in FIGS.
As shown in the figure, the center line in the width direction of the drive-side roller 252 is
It is arranged so as to be aligned straight under the first guide nozzle 230. Next, the thread tension device 300 will be described. As shown in FIG. 7, the thread tension device 300
02, a plate holding spring 304, an adjusting screw 306 for adjusting the pressure of the plate holding spring 304, and guide pins 308 and 309 located above and below the thread tension plate 302. The thread tension plate 302 is attached so as to be supported by a rod 312 that passes through the support block 310 in the horizontal direction. The adjusting screw 306 is fixed to the protruding end of the rod 312, and the adjusting screw 3
Rotating 06 causes the rod 312 to rotate with it.

A male screw 314 is formed on the rod 312 so as to be screwed with a female screw cut into the rod through hole of the support block 310. The first bevel gear 32 is provided at the tip of the rod 312.
0 is fixed. Further, the first bevel gear 32
At 0, the second bevel gear 322 driven to rotate by the motor 330 is meshed. The rotating shaft 352 of the multi-rotational potentiometer 350 is connected to the distal end 318 of the rod 312 via a coupling sleeve 340.

The first bevel gear 320 is housed in a gear case 360 which is screwed to the support block 310. The motor 330 has a slide plate 36 whose lower surface is supported by a lower horizontal wall 361 of the gear case 360.
2 is screwed and fixed. A large opening 363 is formed in the lower horizontal wall 361.

Slide plate 362 and gear case 3
In the upper horizontal wall 364 of the slit 60, slits 365, 366 are provided.
Are formed. The potentiometer 350 described above is
It is screwed and fixed in a potentiometer case 354 slidably engaged with the slits 365 and 366. In addition, what was shown with the code | symbol M in each figure is a potato screw.

With the above configuration, when the adjusting screw 306 is rotated, the rod 312 is rotated. Then, rod 3
12 and the support block 310 are related to a screw feed mechanism in which a male screw and a female screw are screwed together.
2 moves in the axial direction while rotating. As a result, the motor 330 and the potentiometer 350 also move in the axial direction together with the rod 312. At this time, potentiometer 3
The 50 rotation shafts 352 rotate integrally with the rod 312.
Therefore, the potentiometer 350 outputs a detection signal corresponding to the amount of movement of the rod 312.

On the other hand, when the motor 330 is driven, the second bevel gear 322 rotates, and accordingly, the first bevel gear 320 also rotates. As a result, the first bevel gear 3
The rod 312 integrated with 20 also rotates. Therefore, also in this case, the rod 31
2 is moved in the horizontal direction, and the pressure of the thread tension disc 302 is changed. At this time, the detection signal of potentiometer 350 also changes in response to the change in pressure.

In this way, the pressure of the thread presser in the thread tension device 300 can be adjusted by a motor 330 in addition to the manual adjustment by the adjusting screw 306. 7 and 8, an upper arm 370 and a lower arm 380 are attached to the support block 310 of the thread tension device 300. Lower arm 380
Has a base ring 381 fixed to the support block 310 with a potato screw M. On the other hand, the root ring 371 of the upper arm 370 is
Since it is only sandwiched between the support block 82 and the flange 310a of the support block 310, relative rotation with respect to the support block 310 is free.

The tip 372, 3 of each arm 370, 380
82 is rotatably supported on the front plate 112 of the base frame 110 by pins 373 and 383. Note that the pin insertion hole 373a of the upper arm 370 is
As shown in FIG. 9, it has an oval shape.

Pins 374 and 384 are fixed in the middle of each of the arms 370 and 380, and one ends of oval plates 375 and 385 are rotatably supported at the ends thereof. At the other end of the oval plates 375 and 385,
Guide pins 308 and 309 are protruded. Each oval plate 375, 385 is connected to the base frame 31 by pins 376, 386 inserted in the middle thereof.
0 is rotatably supported by the front plate 312. Pin 37
The holes 374a, 384a, and 376a for the pins 374, 384, and 376 among the insertion holes 4 and the like are each formed into an oblong shape as shown in FIG.

Then, as shown in FIG.
The cylinder rod 391 of the air cylinder 390 is connected to the arm 310a protruding from the side surface of the cylinder 10. In the air cylinder 390, air supply / discharge pipes 392 and 393 are arranged in two cylinder chambers formed on both sides of a stored piston. This air supply / discharge pipe 39
By supplying and discharging air to and from the air cylinder 390 at 2393, the thread tension device 300 is moved as a whole as shown in FIG.

FIG. 9A shows a state in which the threading is going to be executed, and the thread tension plate 302 and the guide pin 3 are reduced by reducing the rod 391 of the air cylinder 390.
08 and 309 are moved away from each other to open a passage for the yarn 3. When the threading is completed,
By extending the 90 rods 391, FIG.
As shown in (b), the thread tension plate 302 and the guide pin 30
8 and 309 can be set in an embroidery execution state in which the thread 3 is bent.

Next, returning to FIG. 1, the threading device 400 will be described. The threading device 400 includes a thread take-up spring device 5.
00, a second threading section 440 for threading the balance 610 and the guide claws 621 and 622, and a third threading section for threading the needle 630.
Threading portion 460, and second and third threading portions 440, 4
It can be divided into a connecting portion 480 disposed between the two and a lint vacuum device 490.

First, the first threading section 420 will be described. The first threading section 420 is configured by a guide nozzle 422 for transporting the thread 3 in the vertical direction. The guide nozzle 422 is fixed at a position directly below the guide nozzles 230 of the thread preparation device 100 at a predetermined distance from the sewing head 1 in the front direction. The guide nozzle 422 is connected to each guide nozzle 23 of the yarn preparation device 100.
With a configuration similar to that of 0 or the like, a downward airflow is generated in the threading hole, so that the thread 3 hanging down from above can be sucked into the threading hole and conveyed directly below. Hereinafter, the guide nozzle 422 is referred to as a fifth guide nozzle 422.

Next, the second threading section 440 will be described with reference to FIG.
This will be described with reference to FIGS. Second threading section 440
11 and 12, a fixed plate 441 arranged at a predetermined distance in front of the sewing head 1 and a movable plate 451 arranged between the fixed plate 441 and the sewing head 1 Consists of As shown in FIG.
7, a notch 442 and an opening 443 are formed so that the balance 610 and the guide claw 621 can be seen from the front. The surface of the fixed plate 441 on the movable plate 451 side includes
As shown in FIG. 10, a semicircular groove 444 having an “S” shape laid down is provided. And this semi-circular groove 444
Are formed at predetermined positions. These air blowing ports 445-447 are shown in FIG.
As shown in FIG. 1, there is a passage 446 that is directed obliquely downward with respect to the semicircular groove 444, and generates an air flow for transporting the yarn 3 similarly to the guide nozzle 230 and the like.

The movable plate 451 is formed of a flat plate as shown in FIG. 12, and has the same cutout and opening as the cutout 442 and the opening 443 of the fixed plate 441. And the movable plate 451
Is supported via a bearing 453 on a guide rod 452 extending from the fixing plate 441 toward the sewing head 1. The cylinder rod 455 of the air cylinder 454 is connected to the movable plate 451 as shown in FIG. The air cylinder 454 is fixed to the fixed plate 441 side.
Can be driven into a state in which it is brought into close contact with the fixed plate 441 and a state in which it is separated from the fixed plate 441.

The semi-circular groove 44 provided on the fixing plate 441
As shown in FIG. 10, the inlet end 444 a of the fourth has a linear portion that opens straight upward so as to be aligned with the first to fifth guide nozzles 230 to 422.
The outlet end 444b of the semi-circular groove 444 has a straight portion that opens right below.

Next, the third threading section 460 will be described. The third threading section 460 is provided at a lower front portion of the sewing head 1 as shown in FIG. In the figure, the left side “L” -shaped portion 461 and the right side portion 462 are illustrated as being separated from each other, but both portions 461 and 462 are continuous on the front side of the needle 630 and are integrated. ing. As shown in FIG. 13, a fan-shaped gear 463 provided at the upper end of the L-shaped portion 461 is meshed with the gear 465 of the motor 464, and is configured to be able to jump forward when threading is not performed. .

The L-shaped portion 46 of the third threading portion 460
As shown in FIG. 11, a horizontal through hole 47 is provided so as to be aligned with the needle hole 630a when set in a threading state, as shown in FIG.
1 is formed. Then, oblique holes 472 and 473 are formed in the middle of the horizontal through hole 471, and air is blown in the same manner as the first guide nozzle 230 and the like.
An airflow is formed in a direction in which the yarn is pulled out from the needle hole 630a. At the exit of the horizontal through hole 471, a yarn detection sensor 475 similar to the yarn detection sensor 280 is attached. In FIG. 11, a horizontal through hole 476 is provided in the right portion 462 of the needle 630 so as to be aligned with the horizontal through hole 471 of the L-shaped portion 461.

Next, the communication section 480 will be described. As shown in FIG. 10, the communication portion 480 is connected to the second threading portion 44.
It is constituted by two plates 481 and 482 formed in a “reverse L” shape when viewed from the front, between the zero and the third threading portion 460. In FIG. 10, the right plate 481 is a fixed plate, and the left plate 482 is a movable plate. Fixed plate 48
1, a semicircular groove 483 is formed similarly to the fixing plate 441 of the second threading section 440, and the movable plate 482 is formed of a flat plate. Then, the movable plate 482 is moved by the air cylinder 485 attached to the fixed plate 481 side.
Are driven in a state of being in close contact with the fixed plate 481 and in a state of being separated therefrom.

As shown in FIG. 10, the fixing plate 481 is provided with an appropriate number of oblique holes 486, and air is blown from the oblique holes 486 so that the inside of the semi-circular groove 483 is moved to the second position.
Thus, an airflow from the first threading section 440 to the third threading section 460 is formed.

Note that, as shown in FIG.
Of the second threading section 440 is formed as a straight portion extending in the vertical direction. The outlet end 483b of the semicircular groove 483 is a straight portion extending in the horizontal direction, and is made to coincide with the inlet end of the third threading portion 460.

Next, the yarn waste vacuum device 490 will be described. As shown in FIG. 10, the lint vacuum device 490 includes a suction cylinder 49 that is opened immediately below the fifth guide nozzle.
1 and an orifice 49 provided in the suction cylinder 491.
2 and an air outlet 493 for blowing air into the right side space of the orifice 492 in the figure. By blowing compressed air from the air outlet 493, an airflow is generated in the suction cylinder 491 from left to right in the drawing, and the yarn 3 is sucked.

Next, the thread take-up spring device 500 will be described. A thread take-up spring 501 is provided on the front of the sewing machine head 1.
As shown in FIG. 14, a support member 510 provided at a predetermined distance from a front surface of the sewing machine head 1 with a bolt 502 is rotatably provided.

The supporting member 510 is shown in FIGS.
And arm portions 513 and 514 above and below a square portion 512 in which a large circular hole 511 is opened. Screw holes 5 for screwing guide pins 503 and 504 are provided in upper and lower arms 513 and 514, respectively.
15, 516 are perforated on the front side. A circular hole 517 through which the bolt 502 is inserted is provided in the upper arm portion 513.
1 is provided on the back side of the lower arm portion 513.
As shown in FIG. 6B, a screw hole 518 for a screw 506 for mounting the coil spring 505 is formed. Further, parallel arms 519, 519 extending rearward are provided on the upper right and left sides of the square portion 512.

Circular hole 51 opened in upper arm portion 513
As shown in FIG. 14, a long sleeve 507 is inserted into the bolt 7, and a bolt 502 is inserted into the sleeve 7. Support member 510
Is rotatably supported at a position separated from the sewing machine head 1 by the length of the sleeve 507. The sleeve 507 is attached so as to freely rotate around the bolt 502.
The supporting member 510 is attached so as to be freely rotatable with respect to.

On the other hand, a lever member 520 having a shape as shown in FIGS. 15D and 15E is swingably supported on parallel arms 519 and 519 extending on the back surface of the square portion 512. I have. The lever member 520 includes a forked portion 521 at an upper end, and a tip 521 a of the forked portion 521.
Are curved toward the sewing machine head 1. The lever member 520 is set so as to straddle the bolt 502 and the sleeve 507 as shown in FIG.

As shown in FIG. 14, a thread take-up spring storage member 530 is rotatably inserted into the large-diameter circular hole 511 of the support member 510. The thread take-up spring storage member 530 includes a large-diameter portion 531 and a small-diameter portion 532, and the large-diameter portion 531 has a large-diameter cylindrical hole 533 that accommodates the support shaft 541 of the thread tension discs 508 and 509 and the thread take-up spring 501. Is provided. A thread tension disc support shaft 541 is provided at the bottom of the large-diameter cylindrical hole 533.
A small-diameter cylindrical hole 534 into which the distal end portion 541a is fitted is further formed. A pin insertion hole 535 that penetrates through the inside of the small diameter portion 532 is formed at the bottom of the small diameter cylindrical hole 534.

The above-described thread tension disc supporting shaft 541 is provided with the large-diameter cylindrical hole 5.
The portion 541b accommodated in the cartridge 33 has a large diameter so as to support the thread tension plates 508 and 509 from behind. The thread tension plates 508 and 509 are located on the left side 5 of the support shaft 541 in the drawing.
After being attached to the holding member 41c, the holding member 542, the holding spring 54
3, the thread tension pressure is adjusted by the adjusting nut 544.

Here, the left portion 541c of the support shaft 541
As shown in FIG. 14 (b), is cut in half by a cut 541d, and a pin insertion hole 541e is penetrated from the large diameter portion 541b to the back. A connecting portion 542b that fits into the cut 541d is formed in the insertion hole 542a of the press fitting 542 as shown in FIG. 14C. Note that a portion 541f of the large diameter portion 541b is formed as a concave portion so as to fix the coil portion 501a of the thread take-up spring 501.

On the front side of the support member 510, guide pins 503 and 504 are screwed and fixed in the above-mentioned screw holes 515 and 516. On the back side of the support member 510, FIG.
As shown in FIG. 6, a gear 550 and a sector gear 560 are attached. As shown in FIG. 14A, the gear 550 is fixed to the small-diameter portion 532 of the thread take-up spring storage member 530 by screwing a potato screw M into the boss 551 on the back surface. Therefore, when the gear 550 rotates, the thread take-up spring storage member 530 also rotates.

The fan-shaped gear 560 has a boss 56 on its rear surface.
1 is fixed to the sleeve 507 by screwing the potato screw M into it. A cam member 570 having a shape as shown in FIGS. 15F and 15G is attached to the back side of the boss 561. This cam member 570 is also fixed to the sleeve 507 with the potato screw M. Therefore, the sector gear 5
When the shaft 60 rotates, the sleeve 507 and the cam member 570
Also rotate together.

A stop pin 5 for engaging a cylinder rod 581 is provided on the sector-shaped gear 560 on the rear surface side at the center of the arc portion.
62 are attached. An engagement pin 563 protruding from the front side is protrudingly provided near one end of the arc portion of the sector gear 560. The engagement pin 563 has a height that engages with the side surface of the upper arm portion 513 of the support member 510.

As shown in FIG. 15 (g), the cam member 570 has a cam surface 572 at the edge of the edge portion 571 formed on the back surface side. This cam surface 572 is not in contact with the lever member 520 in the initial state as shown in FIG. The lower end 522 of the lever member 520 is
In the setting state shown in FIG. 14, the thread take-up spring storage member 530 is extended right behind the pin insertion hole 535.
Then, the pin 58 inserted into the pin insertion hole 535
It is designed to support 2 from behind.

The pin 582 connects the lever member 520 with the lever member 520 shown in FIG.
As shown in the figure, when the cam member 570 is rotated counterclockwise until it comes into contact with the base portion 573, the lower end portion 522 of the lever member 520 and the connecting portion 54 of the holding member 542 are formed.
2b is such a length that both ends are almost in contact with each other and does not push up the presser fitting 542.

Next, the operation of the thread take-up spring device 500 configured as described above will be described with reference to FIG. In the initial state, the cylinder rod 581 is in a contracted state, and the sector gear 560 is rotated at an angle shown in FIG. At this time, the thread take-up spring 501 is rotated to a position facing the left side in the figure, and stops at a stopper 750 that functions as a thread break sensor as described later.

From this initial state, the cylinder rod 581
Is extended, so that the sector gear 560 is
The gear 55 rotates in the direction of arrow A in FIG.
0 rotates in the direction of arrow B. As a result, the thread take-up spring 50
1 is rotated to a position facing rightward in the figure.

When the cylinder rod 581 is further extended, as shown in FIG.
Of the upper arm 51 of the support member 510
3 and the support member 510 is rotated this time. As a result, as shown in FIG.
01 is also rotated counterclockwise, and the upper and lower guide pins 50 are rotated.
3, 504 are distributed to the left and right of the thread take-up spring 501. Thus, in the state of FIG. 16D, when the yarn 3 is supplied from directly above, the guide pin 50
It can drop straight without being disturbed by 3,504. As a result, as shown in FIG.
Can be set in the groove portion 501a of the thread catching portion of the thread take-up spring 501.

When the cylinder rod 581 is reduced again after the thread 3 is hung, the support member 510 is first rotated counterclockwise from the state shown in FIG. 16D to the state shown in FIG. 16B. And stop. This stop position is supported by a pin 590 protruding from the sewing machine head 1 to the front side.
10 is a position where the lower arm portion 514 contacts. At this time, the coil spring 505 is set to generate a force for further contraction, and
Is brought into contact with the stopper pin 590 firmly.

When the cylinder rod 581 is further reduced, the sector gear 560 rotates to the initial angle while rotating the gear 550. As a result, as shown in FIG.
3, the thread 3 can be stretched over the support shaft 531, the thread take-up spring 501 and the lower guide pin 504 in a bent state.

During this time, as the sleeve 507 rotates with the extension operation of the cylinder rod 581, the bifurcated portion 521 of the lever member 520 is pushed by the cam surface 572 and pushes the pin 582, so that the presser fitting 542 is pushed up. The pressure of the tension discs 508 and 509 is gradually released.

Conversely, as the cylinder rod 581 contracts, the lever member 520 returns to its original state, and the pressure of the thread tension discs 508 and 509 gradually returns to the set state. Next, the configuration of the control unit in the automatic threading device of the present embodiment will be described. The control unit, as shown in FIG.
A microcomputer 710 having a PU, a ROM, a RAM, a backup RAM, and the like is mainly configured, and a thread preparation switch 721, an embroidery start switch 7
22, an operation panel 720 on which a ten key 723, a thread tension pressure setting switch 724, etc. are arranged, and an air cylinder 15
1,247,254,263,390,454,48
5,580, air valves 731 and 732, yarn detection sensors 280 and 475, motors 141, 255, 330, and 46
4,740, potentiometer 350 and thread break sensor 750 are connected.

Among these peripheral devices, the air cylinder 580, which has not appeared in the description so far, is the thread take-up spring device 50.
At 0, the fan gear 560 is used to rotate. The air valve 731 is connected to the guide nozzle 23.
The air valve 732 is for supplying compressed air to the thread waste vacuum device 490, and is for supplying compressed air to the air blowing port 445 and the like. Further, the motor 740 is a sewing machine motor. The thread break sensor 750 is provided at the position where the thread take-up spring 501 is swung up, as shown in FIG.
An intermittent signal is generated in response to contact with or away from the device. If this intermittent signal is no longer generated during embroidery, it can be determined that the thread is broken.

Next, a method of using the apparatus of this embodiment will be described together with a control program executed by the microcomputer 710. First, the spool 2 is set in the cheese case 210, the thread 3 is pulled out, and the support member 214
Of the yarn 3 is inserted into the funnel-shaped upper end portion 214u.
This operation is performed for each of the 24 cheese cases 210.

Next, the thread preparation switch 721 is depressed.
Then, the yarn preparation program configured by the procedure shown in FIG. 18 is executed. When the thread preparation is executed for the first time, the ten key 72
Input "0" from 3. When only the yarn of the n-th cheese case is in the ready state, any numerical value of “1” to “24” is input.

First, the air cylinder 247 is supplied with air to put the clamper 240 in an unclamped state, the motor 330 is driven to open the thread tension plate 302 of the thread tension device 300, and the air cylinder 390 is further driven to drive the thread. The tension device 300 is released to the state shown in FIG. Further, the air cylinder 254 is driven to put the driven side roller 251 in a state of holding the yarn, and the air valve 732 for the yarn waste vacuum device 290 is opened to start the suction operation of the yarn waste.
The air cylinder 263 for the zero drive is driven to perform the thread cutting operation, and after a predetermined time, the air valve 732 is closed, and the air cylinder 263 is returned to a state where the blades 261 and 262 of the cutter 260 are opened. Is exhausted, the rod 248 is returned to a position away from the clamper 240, and the air cylinder 390 and the motor 330 are driven in the opposite direction to the above to drive the thread tension device 300 in FIG.
(B), the thread tension plate 302 is closed, and the air cylinder 254 is also driven in the opposite direction to return the driven roller 251 to the state in which the thread is released to initialize the system (S10). ). Thereby, even if any thread is passed through the needle 630, this is cut and
It will be removed as lint.

Next, the input value k of the ten key 723 is set to “0”.
Or “1” to “24” (S
20). If "0", n = 1 is set (S3
0) Then, the motor 141 is driven to move the slide block 120 to a position for preparing the yarn from the n-th cheese case, and the air cylinder 247 is supplied with air to make the n-th clamper 240. Into the unclamping position, and further drive the air cylinder 151 to
In the state where air can be supplied to the first first guide nozzle 230, a preparation operation on the yarn preparation device 100 side for feeding the n-th yarn is performed (S40).

Further, the sewing machine motor 740 is driven to
30 and the balance 610 are moved to the threading position shown in FIG. 1 (S50). And the air cylinders 454, 485
To bring the movable plates 451 and 482 into close contact with the corresponding fixed plates 441 and 481, respectively,
Is driven to rotate the third threading portion 460 to the position shown by the solid line in FIG. 13 to form a path for the thread 3 (hereinafter, referred to as a "thread path") in the sewing machine head portion (S60). Further, the air cylinder 390 and the motor 330 are driven in the direction initially performed in the initialization, and the thread tension device 300 is released to the state shown in FIG. (S70), the air cylinder 580 is driven, and the thread take-up spring device 500 is moved to the position shown in FIG.
A preparation state of 6 (d) is set (S80). Then, the air valve 731 is opened (S90).

In this way, the yarn in the n-th cheese case is sucked out from the through-hole 214a of the support member 214 through the transfer tube 220, and is transferred from the first guide nozzle 230 directly below. Then, when the yarn detection sensor 280 is turned on (S100), the air valve 731 is closed once, and the air is supplied to the air cylinder 254 so that the driven roller 2
The thread 3 is sandwiched by bringing the 51 into close contact with the drive-side roller 252 (S110, S120). After this, the air valve 7 again
31 is opened, the motor 255 is driven, and the yarn 3 is fed out at a constant speed by the yarn feed roller 250 (S13).
0, S140). The yarn 3 is conveyed downward through the path formed by the airflow.

Then, the motor 255 is stopped when the yarn 3 is fed out by a length sufficient to reach the position of the yarn waste vacuum device 290 (S150). The stop timing of the motor 255 is controlled by how many times the motor 255 is rotated. Subsequently, the air cylinder 247 is exhausted, and the corresponding clamper 240 is moved to the yarn holding position to hold the n-th yarn (S160). Then, the air valve 732 is opened to start the yarn suction operation by the yarn waste vacuum device 290, and the air cylinder 263 is driven to cause the cutter 260 to execute the yarn cutting operation (S17).
0). Thereby, the thread 3 is cut when passing through the first guide nozzle 230, the through hole 246 of the rod of the clamper 240, and the through holes 126 and 127 of the slide block 120.

The air cylinder 254 is evacuated, the driven roller 251 is returned to the open position, the air valves 731 and 732 are closed, the air cylinder 263 is driven in the opposite direction, and the blades 261 and 262 of the cutter 260 are opened. These are returned to the standby state (S180). And n = n
After incrementing +1 and n (S190), n>
The processing of S40 and the subsequent steps is repeated until the number of times reaches 24 (S20
0).

On the other hand, in S20, k = “1” to “2”
If "4", n = k is set (S210),
Hereinafter, the same yarn preparation operation as S40 to S180 is executed only for n = k (S220). Next, a case where the embroidery start switch 722 is pressed will be described. The embroidery start switch 722 is pressed after the thread preparation as described above is performed.

When the embroidery start switch 722 is pressed,
The program is executed according to the procedure shown in FIG. First, data for executing embroidery is read out (S310), and the number of thread to start embroidery is specified based on the color code at the start of sewing (S320).

Then, the specified yarn number is set to n (S330), and the same initialization as described in S10 and the same processing as S40 to S80 are executed (S34).
0). Thereafter, the air cylinder 254 is driven to hold the yarn between the yarn feed rollers 250 (S350). Then, the air valve 731 is opened, the motor 255 is driven, and the yarn 3 is fed by the yarn feed roller 250 at a constant speed (S360). The yarn 3 is conveyed downward through the path formed by the airflow, and is moved to the yarn take-up spring 50 in the preparation position.
1 through the thread take-up part 501a, the guide claw 621, the balance 6
10, while passing through the guide claw 622, the needle is passed through the needle hole 630a.

Then, the motor 255 is stopped when the yarn 3 has been fed out by a length just reaching the position where the tip end of the yarn 3 has escaped by a predetermined amount before the needle hole 630a (S370). The stop timing of the motor 255
The number of rotations of the motor 255 is controlled. And
As a precaution, it is confirmed whether or not the yarn detection sensor 475 has been turned on (S380). If it is not turned on, it is determined that an error has occurred, and the movable plate opening operation, the clamping operation, and the thread cutting operation are performed (S390 to S415). Note that the clamping operation and the thread cutting operation are the same operations described as S160 and S170. In the movable plate opening operation, the air cylinders 454 and 485 are driven to return the movable plates 451 and 482 to the open positions,
A process of driving the third threading section 460 to the position shown by the dashed line in FIG. 13 by driving the second threading section 64 is performed, and the sewing machine motor 740 is further driven to move the balance 610 to the ascending position. Then, the processing of S340 and subsequent steps are repeated again.

When the thread 3 has been passed, the air valve 731 is closed (S420), and the air cylinders 454 and 48 are closed.
5 to move the movable plates 451 and 482 to the fixed plates 441 and 4
Then, the motor 464 is driven to rotate the third threading section 460 to the position shown by the one-dot chain line in FIG. 13 to release the thread path in the sewing machine head (S430). Then, the sewing machine motor 740 is driven to swing the balance 610 upward (S440). Also, the air cylinder 390
To move the thread tension device 300 to a fixed position for executing embroidery in which the thread is hooked in a bent state as shown in FIG. 9B, and the air cylinder 580 to drive the thread tension spring device 500. 16 (f) is moved to the home position for embroidery execution in which the thread is hooked in the bent state (S450, S4).
60).

Next, according to the yarn number, the yarn tension device 300
The thread tension pressure table in is searched (S470). This table is stored in the backup RAM of the microcomputer 710. Then, based on the thread tension pressure for each thread, the motor 330 is driven while confirming the output of the potentiometer 350 to
An operation of adjusting the thread tension pressure to an appropriate value is performed (S480). Numerical values are set and stored in the thread tension pressure table by a table setting process described later.

After the adjustment of the thread tension pressure is completed, embroidery is executed according to the embroidery data (S490). If a color code designating thread replacement appears in the data (S500), the color code specified by the color code is used. The number of the thread is set to n (S510), and the process from S340 is executed. If a thread break is detected even if no color code appears, the processing of S340 and thereafter is executed (S5).
20). In this way, embroidery is executed until the data end (S530).

Next, a method of setting the thread tension pressure table will be described. In this thread tension table, a predetermined pressure value is set as a default value for each of yarns 1 to 24. However, the yarns are set of various properties each time, so that the default value is too strong or too weak. Therefore, the pressure of the thread tension device 300 is adjusted before or during embroidery using the adjusting screw 306. After the pressure is adjusted, the thread tension pressure setting switch 7
When 24 is pressed, first, as shown in FIG. 20, the number n of the currently threaded thread is read (S610). Further, the current output value Q of the potentiometer 350 is read (S620), and the potentiometer output Q is written in a corresponding portion of the table as a pressure setting condition for the n-th yarn to update the table (S630). In this way, it is possible to create a table in which the optimum thread tension pressure relationship is set for the currently set thread as needed.

As described above, according to the present embodiment, once the spool 2 is set in the cheese case 210, the system automatically performs the process from thread preparation to threading. Therefore, preparation work for embroidery is greatly reduced. Moreover, since a single-needle sewing machine can be used, even if a large number of sewing machines are arranged, a small space is not required and a factory can be designed more efficiently. As the number of sewing machines increases, the preparation becomes more difficult, but the system according to the present embodiment solves this problem.

Further, the thread tension pressure of the thread tension device 300 can be read out from a table created in advance and automatically set to an optimum value for each thread. It can be easily realized.
Furthermore, since the position of the thread take-up spring 501 is moved between the thread preparation state and the thread hooking state, and the thread passage can be simplified at the time of threading, the failure of threading is eliminated, and the success rate is greatly reduced. Can be improved.

Although the embodiment of the present invention has been described above, the present invention can be embodied in various modes without departing from the gist of the present invention. For example, although the embodiment has been described with reference to a single-needle embroidery sewing machine, the initial thread tension pressure can be set by applying the present invention to a plurality of thread tension devices of a multi-needle embroidery sewing machine. It is also possible to easily carry out the operation according to past results, and the object of the present invention can be sufficiently achieved. Further, by giving the thread tension pressure numerically, the object of the present invention can be sufficiently achieved in that an accurate thread tension pressure is quickly realized.

[Brief description of the drawings]

1A and 1B show an overall configuration of an automatic apparatus for preparing and threading a thread of an embroidery sewing machine according to an embodiment, wherein FIG. 1A is a schematic diagram viewed from the front, and FIG. It is a schematic diagram.

FIGS. 2A and 2B show a cheese case and parts thereof in an embodiment, wherein FIG. 2A is an enlarged cross-sectional view of the whole, and FIG.

FIG. 3 is a partial cross-sectional view of the yarn preparation device in the embodiment as viewed from the front.

FIG. 4 is a partial cross-sectional view of the thread preparing device in the embodiment as viewed from the front of a sewing head.

FIG. 5 is an enlarged sectional view of a portion of a first guide nozzle and a clamper in the embodiment as viewed from the front.

FIG. 6 is an enlarged cross-sectional view of a part of a feed roller, a cutter, a second guide nozzle, and a yarn detection sensor in the embodiment as viewed from the front.

FIG. 7 is an enlarged cross-sectional view of a portion of a third guide nozzle, a thread tension device, and a fourth guide nozzle in the embodiment as viewed from the front.

FIG. 8 is an enlarged cross-sectional view of a portion of a third guide nozzle, a thread tension device, and a fourth guide nozzle in the embodiment as viewed from the front of a sewing head.

FIG. 9 is an explanatory diagram showing an operation of the thread tension device in the embodiment.

FIG. 10 is a partially enlarged view of FIG.

FIG. 11 is an enlarged view of FIG. 1 (b).

FIG. 12 is an explanatory diagram illustrating an operation of a second threading device in the embodiment.

FIG. 13 is an explanatory diagram showing an operation of a third threading device in the embodiment.

14A and 14B show a thread tension device and components thereof in the embodiment, wherein FIG. 14A is a partial cross-sectional view as viewed from the front, FIG. 14B is an explanatory diagram of a thread tension disc support shaft, and FIG. It is a top view which shows a plane shape.

15A and 15B show components of the thread take-up spring device in the embodiment, wherein FIG. 15A is a front view of the support member, FIG. 15B is a right side view of the support member, FIG. 15C is a bottom view of the support member, and FIG. FIG. 5E is a front view of the lever member, FIG. 7E is a right side view of the lever member, FIG. 7F is a front view of the cam member, and FIG.

FIG. 16 is an explanatory diagram showing an operation of the thread take-up spring device in the embodiment.

FIG. 17 is a block diagram of a control system in the embodiment.

FIG. 18 is a flowchart of a yarn preparation program in the embodiment.

FIG. 19 is a flowchart of an embroidery execution program in the embodiment.

FIG. 20 is a flowchart of a thread tension pressure setting program in the embodiment.

[Explanation of symbols]

1 ... sewing machine head, 2 ... thread winding, 3 ... thread, 1
00: yarn preparation device, 110: base frame,
120: slide block, 130: equipment mounting block, 141: motor, 151: air cylinder, 152: air supply head, 210: cheese case, 214: support member, 220: conveying tube, 230: first guide nozzle, 240:
Clamper, 247: Air cylinder, 250: Thread feed roller, 254: Air cylinder, 255:
Motor, 260 cutter, 263 air cylinder, 272 second guide nozzle, 273 third
Guide nozzle, 274 Fourth guide nozzle, 280
Thread detection sensor 290 Thread waste vacuum device 300 Thread tension device 302 Thread tension plate
304: countersunk spring, 306: adjusting screw, 30
8, 309: guide pin, 330: motor, 3
50: potentiometer, 390: air cylinder, 400: threading device, 420: first threading section, 422: fifth guide nozzle, 440: second threading Part, 441: fixed plate, 444: semicircular groove, 451: movable plate, 454: air cylinder, 460: third threading part, 463: sector gear, 464: motor, 465: gear, 475
..Yarn detection sensors, 480... Communication parts, 481.
Fixed plate, 482 ... movable plate, 483 ... semi-circular groove,
485: air cylinder, 490: thread waste vacuum device, 500: thread take-up spring device, 501: thread take-up spring, 503, 504: guide pin, 510
..Support members, 550: gear, 560: sector gear, 563: engagement pin, 580: air cylinder, 610: balance, 621, 622: guide claw, 630 ... needle, 700 ... control unit, 710 ...
.Microcomputer, 720: operation panel, 7
21: thread preparation switch, 722: embroidery start switch, 723: numeric keypad, 724: thread tension pressure setting switch, 731 and 732: air valve, 740
... Sewing machine motor, 750 ... Thread break sensor.

Claims (6)

[Claims] An actuator for sliding a shaft of an adjusting screw for adjusting a pressure of a disk presser spring for pressing a thread tension disk; and an actuator corresponding to a pressure applied to the thread tension disk as a result of the sliding motion by the actuator. A thread tension information detecting means for outputting a signal; and a control means for controlling the thread tension pressure to a desired pressure by driving the actuator based on an output signal of the thread tension information detecting means. Tone device. 2. The thread tension device for a sewing machine according to claim 1, wherein the thread tension pressure information detecting means comprises a slide amount detecting means for outputting a signal corresponding to a sliding momentum by the actuator. Sewing machine thread tension device. 3. The thread tension device for a sewing machine according to claim 1, wherein the actuator has a thread formed on an outer periphery of a shaft of the adjusting screw, and has a screw hole fitted to the thread. After the screw thread is engaged with the block, it is constituted by screw feed means for rotating the axis of the adjustment screw, and the slide amount detection means is constituted by a sensor for detecting the rotation amount of the axis of the adjustment screw. A thread tension device for a sewing machine, comprising: 4. The thread tension device for a sewing machine according to claim 1, wherein adjustment conditions for the thread tension pressure are stored in advance, and control conditions necessary for the control means are determined based on the stored contents. A thread tension device for a sewing machine, comprising: a condition providing means for giving a condition. 5. The thread tension device for a sewing machine according to claim 4, wherein the condition providing means includes a table in which a plurality of threads are associated with a unique thread tension pressure adjustment condition for each thread; Means for specifying a thread set in the apparatus. 6. The thread tension device for a sewing machine according to claim 4, further comprising an updating unit that updates the storage content of the condition providing unit.