JP2000042280A - Needle thread stocker for multi-needle embroidery machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unconvenience where a needle thread passing through another needle slips out and relaxes from occurring by making surely only the needle thread slip out when the surrounding of the end part of the needle thread slips out from a needle thread stocker. SOLUTION: A needle thread stocker 20 is provided on a thread holding apron 7 of an embroidery head 1 to hook and stock the surrounding 8a of the end part of a needle thread 8 in such a way that the needle thread 8 passing through a needle 5 is not hung down on a processing fabric when the needle 5 starts embroidery sewing. The same number of thread holding devices 10 as those of the needles 5 provided in a thread holding apron 7 are utilized and a press body 21 for pinching and stocking the surrounding 8a of the end part of the needle thread 8 between the front face of the thread holding apron is fitted on the front end of a driving pin 11 moving back and forth with a movable holding piece 13 of the thread holding device 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a needle thread stocker provided on a thread holding apron of an embroidery head having a plurality of needles.

[0002]

2. Description of the Related Art In a multi-needle embroidery sewing machine, as shown in FIG. The vicinity 53a is collectively locked and stocked by two upper thread stockers 55 provided at both ends of the thread holding apron 54, and then the sewing machine is operated, and one of the needles 52 selected from the plurality of needles 52 is operated. The needle 52 is arranged at the sewing position A to perform embroidery sewing. This is because if the upper thread 53 passing through the needle 52 that has not been arranged at the sewing position A (the embroidery sewing has not been started) has drooped on a work cloth (not shown), the dripping occurs. The needle thread is sewn into the work cloth by the needle arranged at the sewing position A, so that the sewing is prevented.

[0003] With respect to the needle 52 once placed at the sewing position A, when the needle 52 starts the embroidery sewing, the upper thread 53 passing through the needle 52 is pulled and the vicinity of the end 53 is obtained.
a comes off from the upper thread stocker 55. Then, when the needle 52 stops the embroidery sewing, the upper thread 53 passing through the needle 52 is cut by a thread cutting device (not shown) near the shuttle, and the upper thread 53 is positioned behind the needle 52. The upper thread is lifted to the rear of the needle 52 by an upper thread separating device (not shown), and the vicinity of the cut end of the upper thread 53 is held by the upper thread holder (not shown) behind the needle 52. There is no need to lock the 53 with the upper thread stocker 55 again.

As shown in FIG. 6, a conventional upper thread stocker 55 includes a support screw 56 screwed to a front wall of a thread holding apron 54 and a seat plate 57 locked to the head of the support screw 56.
A pressing plate 58 displaceably passed through the shaft of the support screw 56; and a pressing plate 58 interposed in a compressed state between the seat plate 57 and the pressing plate 58, and holding the pressing plate 58 on the front wall of the thread holding apron 54. An urging spring 59 urges the holding thread 58 between the presser plate 58 and the front surface of the thread holding apron 54 so that the vicinity of the end 53a of the upper thread 53 is sandwiched and stocked.

[0005] As shown in FIG. 6, the front wall of the thread holding apron 54 has a front end face of a drive pin 60 of the thread gripping device provided in the same number as the number of the needles 52. The front end surface thereof is substantially flush with the front surface of the thread holding apron 54 when the drive pin 60 is retracted (at the time of thread gripping) (see anything other than the sewing position A), and when the drive pin 60 advances (the thread grip is released). At the time), it protrudes forward from the front surface of the thread holding apron 54 (see the sewing position A).

[0006]

However, a plurality of (four to five in the illustrated example) upper thread 5 is provided in one upper thread stocker 55.
Since the vicinity 53a of the end portion 3 is held together, the sewing position A as shown by two long arrows in FIG.
5 near the end of the upper thread 53 passing through the needle 52 disposed at
When the upper thread 3a comes off from the upper thread stocker 55, the vicinity 53a of the other upper thread 53 passing through another needle 52 (adjacent to the sewing position A in the illustrated example) is also pulled together with the upper thread stocker by friction or the like. In some cases, the needle thread 53 may come off and fall off, and the above-described sewing may be performed on the upper thread 53.

Further, as described above, the upper thread 53 at the sewing position A is used.
When the needle comes off, the upper thread 53 may be loosened even if it does not come off to form a loop below the needle 52. In this case, in a high-speed sewing machine in which only one cloth presser 61 is provided at the sewing position A and driven independently of the needle 52 as shown in the illustrated example, the embroidery head 51 rotates and is disposed at the sewing position A. When the needle 52 changes (at the time of color change), the loop of the loose upper thread 53 may be caught on the cloth presser 61 by the rotation. Then, the upper thread 53 eventually comes off from the upper thread stocker 55 and falls off, and the above-described sewing has occurred with respect to the upper thread 53.

In view of the above, an object of the present invention is to ensure that when the vicinity of the end of the upper thread passing through the needle disposed at the sewing position comes off the upper thread stocker, only the upper thread comes off. An object of the present invention is to provide a multi-needle embroidery sewing machine upper thread stocker which can prevent a problem that upper threads passing through other needles come off or come loose together.

[0009]

According to the present invention, a needle thread provided on a thread holding apron of an embroidery head provided with a plurality of needles, the needle thread passing through each needle before starting the embroidery sewing is processed. In an upper thread stocker that locks and holds the vicinity of the end of the upper thread so as not to hang onto the cloth, the same number of needle grasping devices as the number of the needles provided inside the thread holding apron are used. At the front end of the drive pin which advances and retreats together with the movable gripping piece of the thread gripping device, a presser for holding the vicinity of the end of the upper thread between the front end of the thread holding apron and the stock is mounted.

Here, when the drive pin is retracted and the movable gripping piece clamps the middle of the upper thread between the movable gripping piece and the fixed gripping piece of the thread gripping device, the pressing body moves between the movable gripping piece and the front surface of the thread holding apron. When the vicinity of the end of the upper thread is pinched and the drive pin advances, and the movable gripper releases the pinching of the middle part of the upper thread, the presser releases the pinch near the end of the upper thread. Therefore, it is preferable to adjust the mounting position of the pressing body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high-speed multi-needle embroidery sewing machine embodying the present invention will be described below with reference to FIGS. A plurality of needle bars 4 are arranged in the embroidery head 1 of the multi-needle embroidery machine so as to be vertically movable at equal intervals in a circumferential direction, and a needle 5 is attached to each needle bar 4. By the rotation of the embroidery head 1, one needle 5 selected from the plurality of needles 5 is arranged at the sewing position A and driven. On the other hand, only one cloth presser 6 is provided at the sewing position A, and is driven independently of the needle 5 arranged at the sewing position A. A thread holding apron 7 is mounted on the front surface of the embroidery head 1, and the thread holding apron 7 holds the upper thread 8 passed through each needle 5 when necessary.
Zeros are provided at positions corresponding to the respective needles 5 by the same number as the needles 5 and the like.

Each of the yarn gripping devices 10 includes a yarn holding apron 7
Drive pin 1 that moves forward and backward through the front and rear walls of the vehicle
1, a movable gripping piece 13 attached to the drive pin 11 with a screw 12 inside the thread holding apron 7 and moving forward and backward together, and attached to the upper wall of the thread holding apron 7 with the screw 14 inside the thread holding apron 7 The fixed gripping piece 15 and the movable gripping piece 13 interposed between the front wall of the thread holding apron 7 and the movable gripping piece 13
And an urging spring 16 for urging in a direction in which the urging spring 16 is pressed against the urging spring 16.
The rear end of each drive pin 11 largely projects rearward from the yarn holding apron 7. The embroidery head 1 has a pin pressing device for pressing the rear end of the drive pin 11 of the thread gripping device 10 corresponding to the needle 5 arranged at the sewing position A forward against the urging spring 16 when necessary. 17 are provided.

The upper thread stocker 20 of the present embodiment utilizes the same number of thread grippers 10 as the needles 5 and the like, and is provided between the front end of the drive pin 11 of each thread gripper 10 and the front surface of the thread holding apron 7. The presser body 21 for holding and stocking the vicinity 8a of the end portion of the upper thread 8 is attached. Specifically, the drive pin 11
Not only when the drive pin 11 is moved forward (when the thread clamp is released) but also when the drive pin 11 is retracted (when the thread is clamped).
The thread holding apron 7 is provided so as to protrude forward from the front surface, and a pressing body 21 is attached to the front end thereof. Presser body 21
Is formed in a dish shape (or button shape) with resin, metal or the like.

More specifically, when the drive pin 11 retreats and the movable gripper 13 clamps the middle portion 8b of the upper thread 8 between the movable gripper 13 and the fixed gripper 15, the presser body 21 moves the thread holding apron 7
Between the front end of the upper thread 8 and the front face of the upper thread 8,
When the drive pin 11 moves forward and the movable gripping piece 13 releases the pinching of the middle portion 8b of the upper thread 8, the pressing body 21 releases the pinching of the vicinity 8a of the end of the upper thread 8 so as to release. The mounting position of the pressing body 21 at the front end of the pin 11 is adjusted.

In addition, the embroidery head 1 is provided with a thread hooking frame 24, which is located at the front of the lower end of each needle 5 and through which the upper thread 8 is passed from below. Although not shown, as is well known, on a bed provided below the embroidery head 1, an embroidery frame on which a work cloth is spread is driven by a driving device back and forth and left and right in a horizontal plane. I have. The bed is provided with a needle plate, and a thread cutting device and a shuttle are provided below the needle plate. Then, one of the needles 5 selected from the plurality of needles 5 is arranged at the sewing position A with the rotation of the embroidery head 1, and the needle 5 at the sewing position A and the shuttle cooperate to form a work cloth. Embroidery sewing is performed.

The multi-needle embroidery sewing machine and the upper thread stocker 20 configured as described above are used as follows.

(1) First, one needle 5 is arranged at the sewing position A, and the drive pin 11 of the thread gripper 10 corresponding to the needle 5 is pushed forward by the pin pressing device 17 to advance the thread gripper. The gap between the movable gripping piece 13 and the fixed gripping piece 15 of the device 10 is opened, and the gap between the pressing body 21 of the upper thread stocker 20 and the thread holding apron 7 is opened. The upper thread 8 is inserted between the movable gripping piece 13 and the fixed gripping piece 15 in the thread holding apron 7 from the bobbin through a thread tension plate, a balance (not shown), and the like. The thread is passed through the needle 5 and further passed through the thread hooking frame 24, and the vicinity 8 a of the end of the upper thread 8 is hooked between the presser body 21 and the front surface of the thread holding apron 7.
Then, as shown in FIG. 3, the pin pressing device 17 is retracted, the drive pin 11 is retracted by the biasing spring 16, and the middle portion 8b of the upper thread 8 is moved to the movable gripping piece 13 and the fixed gripping piece 15 as shown in FIG.
And the vicinity 8a of the end of the upper thread 8 is sandwiched between the presser body 21 and the front surface of the thread holding apron 7 to stock. Subsequently, the embroidery head 1 is sequentially rotated to arrange the other needles 5 one after another at the sewing position A, and the upper thread 8 is passed through the thread gripping device 10 or the like corresponding to each needle 5 in the same manner as described above. The intermediate portion 8b is clamped by the thread gripping device 10, and the end portion 8a is clamped by the corresponding upper thread stocker 20 for stocking.

(2) The sewing machine is operated, and as shown in FIGS. 1 and 4, one needle 5 selected from the plurality of needles 5 is arranged at the sewing position A to perform embroidery sewing. The needle 5
When the sewing machine starts embroidery sewing, the pin pressing device 17 presses the drive pin 11 of the thread grip device 10 corresponding to the needle 5 and advances the same.
Is released, and the upper thread 8 can be supplied from the bobbin. At the same time, the pressing body 21 releases the pinching of the vicinity 8a of the end, and the vicinity 8a of the end easily comes off the upper thread stocker 20. At this time, since only one end 8a near the end of one upper thread 8 is held by one upper thread stocker 20, even if the end 8a near the end comes off from the upper thread stocker 20,
It does not interfere with the other upper thread 8 passing through the other needle 5 at all. Therefore, the other upper thread 8 does not come off and fall off together (not sewn into the work cloth) and does not loosen (do not form a loop below the needle 5).

(3) When the needle 5 arranged at the sewing position A stops the embroidery sewing, the thread gripping device 10 clamps the middle 8b of the upper thread 8 and the upper thread 8 passing through the needle 5 It is cut by a thread cutting device (not shown) near the shuttle. The upper thread 8 is lifted to the rear of the needle 5 by an upper thread retractor (not shown) behind the needle 5, and the vicinity of the cut end of the upper thread 8 is moved to the upper thread holder 25 (see FIG. 4), there is no need to lock the upper thread 8 to the upper thread stocker 20 again.

(4) The embroidery head 1 rotates and the sewing position A
When the needle 5 arranged at the position changes (when the color is changed), all the needles 5 and the upper thread 8 rotate together, while the cloth presser 6 stops at the sewing position A. At this time, as described in (2) above, since each upper thread 8 does not form a loop below the needle 5, there is no problem that each upper thread 8 is caught by the cloth presser 6 and comes off from the upper thread stocker 55. .

The present invention is not limited to the above-described embodiment, but may be modified as follows, for example. (1) Changing the material and shape of the presser body 21. (2) A male screw is formed at the front end of the drive pin 11 and
A female screw is formed in 1 and both are screwed together so that the position can be adjusted. (3) A general type of embroidery sewing machine in which the cloth presser 6 is provided on each of the needle bars 4 and is driven together with the needles 5.

[0022]

As described above in detail, according to the upper thread stocker of the multi-needle embroidery sewing machine according to the present invention, the vicinity of the end of the upper thread passing through the needle disposed at the sewing position is shifted from the upper thread stocker. When it comes off, it is ensured that only the upper thread comes off, and it is possible to prevent the upper thread passing through other needles from coming off or loosening together.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a multi-needle embroidery sewing machine and its upper thread stocker according to an embodiment of the present invention.

FIG. 2 is a view of a thread holding apron, a thread gripper, and a needle thread stocker of the multi-needle embroidery sewing machine viewed from below.

FIG. 3 is a cross-sectional view showing a state in which the upper thread is clamped by the thread gripper and the upper thread stocker.

FIG. 4 is a cross-sectional view showing a state in which the upper thread is clamped and released by the thread gripper and the upper thread stocker.

FIG. 5 is a perspective view showing a conventional multi-needle embroidery sewing machine and its upper thread stocker.

FIG. 6 is a sectional view of the same yarn stocker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Embroidery head 5 Needle 7 Thread holding apron 8 Upper thread 8a Near end 8b Midway 10 Thread gripper 11 Drive pin 13 Movable gripper piece 15 Fixed gripper piece 20 Upper thread stocker 21 Presser body

Claims (2)

[Claims] 1. An embroidery head provided with a plurality of needles is provided on a thread holding apron so that an upper thread passing through each needle does not drop onto a work cloth before embroidery sewing starts. In the upper thread stocker that locks and stocks the vicinity of the end of the upper thread, using the same number of thread grippers as the number of the needles provided on the thread holding apron, advances with the movable gripper pieces of each thread gripper. An upper thread stocker for a multi-needle embroidery sewing machine, wherein a presser for holding the upper end of the upper thread between the front end of the thread holding apron and stocking the upper thread is attached to the front end of the retreating drive pin. 2. When the drive pin retreats and the movable gripping piece clamps the middle part of the upper thread between the movable gripping piece and the fixed gripping piece of the thread gripping device, the pressing body moves the front surface of the thread holding apron. When the drive pin moves forward and the movable gripping piece releases the clamping of the middle part of the upper thread, the pressing body 2. The upper thread stocker of the multi-needle embroidery sewing machine according to claim 1, wherein the mounting position of the presser body is adjusted so as to release the clamping near the end.