JP2002143590A - Bobbin replacing device and automatic bobbin thread feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely guide a bobbin thread which extends from a bobbin case in a specified direction, and increase the reliability of an automatic bobbin thread feeding device in respective processes. SOLUTION: This bobbin replacing device 20 is equipped with a chuck 1 and a carrying means. In this case, the chuck 1 performs the gripping and the releasing of the bobbin case 40. Also, the chuck 1 is equipped with a thread end holding member 7 which holds a thread end extending from the bobbin case. The carrying means comprising a turning means 21 and a direct acting means 30 carries the bobbin case 40 gripped by the chuck 1 along a specified moving path. For such a bobbin-replacing device 20, a third air nozzle 6 and a CPU 71 are equipped. In this case, a third air nozzle 6 is disposed in the vicinity of a thread end guiding location A on the moving path, and jets air to the bobbin case which stops at the location A while being gripped by the chuck 1 so that the thread end may be held by the thread end holding member 7. The CPU 71 controls the carrying means in such a manner that the bobbin case may stop at the location A for one time, and at the same time, air may be output from the third air nozzle 6 when the bobbin case stops for one time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin exchanging device for exchanging a bobbin case and an automatic bobbin thread supplying device provided with the bobbin exchanging device.

[0002]

2. Description of the Related Art An automatic lower thread supply device for automatically winding a lower thread on a bobbin has been known. The bobbin automatic supply device includes a bobbin exchanging device for exchanging a bobbin in which the bobbin thread is wound to a predetermined amount or less by sewing and a bobbin around which the bobbin thread is wound together with a bobbin case by a holding portion, and a bobbin removed from a shuttle. And a bobbin winding device for newly winding a bobbin thread around the bobbin after removing the bobbin thread. In this bobbin thread automatic feeding device, when the bobbin thread in the bobbin case in the bobbin case mounted in the sewing machine is consumed to a predetermined amount or less, the sewing machine is stopped, and the bobbin case is moved from the inside of the hook by the gripping portion. And remove another bobbin case equipped with a bobbin already wound with a thread from the dummy shaft and attach it to the shuttle,
The sewing operation is started again. During the restarted sewing operation, the yarn remaining on the bobbin in the bobbin case taken out earlier is removed by the residual yarn removing device, and then a predetermined amount of the yarn is removed by the bobbin winding device. Wrap around. Thereafter, the bobbin case is once mounted on the dummy shaft, and when the bobbin thread in the shuttle is consumed again, the bobbin case is conveyed from the dummy shaft to the sewing machine shuttle.

[0003] The applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 11-216285 in order to solve the problem caused by the variation in the position and direction of the lower thread extending from the bobbin case when the bobbin is changed by the bobbin changing device. It has been proposed to provide air output means near the dummy shaft. According to the present invention, when the bobbin case is mounted on the hook shaft, the lower thread is located between the bobbin case lever and the bobbin case body,
This eliminates the problem of being pinched between the bobbin case and the shuttle.

[0004]

However, the air output means according to the invention described in the above-mentioned publication discloses a method in which the bobbin thread is wound until the bobbin case already mounted on the dummy shaft is attached to the shuttle. The guidance is performed in a predetermined direction, and the control of the lower thread is not sufficient in a series of operations of the lower thread automatic supply device. For example, when removing the bobbin thread taken out from the shuttle with the residual thread removing device, the bobbin thread is pulled out with the thread end clamped, but the thread end is conveyed from the shuttle to the residual thread removing position. However, there is a case where the thread end cannot be clamped because it is hung on the open end side of the bobbin case and sticks to a member constituting the gripping portion. In this case, an error occurs in the residual thread removing operation, and the sewing operation is interrupted, which causes a reduction in work efficiency.

Further, if the bobbin is wound around the bobbin in the bobbin winding device and then the bobbin is trimmed between the yarn supply source and the bobbin, the end of the bobbin may be shrunk, resulting in a habit. If the bobbin winding device is attached to the dummy shaft in this state, the yarn end may be pinched between the dummy shaft and the bobbin case, or may be pinched between the bobbin case body and the bobbin case lever. is there. If the thread is pinched when it is mounted on the dummy shaft in this way, the thread becomes more habitous, and cannot be hammered even when air is blown as described in the above-mentioned publication, and the upper thread and the lower thread are entangled at the start of sewing. Problems such as inability to operate sometimes occurred. The above-mentioned inconvenience was particularly noticeable in hard and heavy yarns such as thick cotton yarns, and was particularly problematic.

SUMMARY OF THE INVENTION It is an object of the present invention to reliably guide a lower thread extending from a bobbin case in a predetermined direction when a bobbin is replaced by a bobbin replacing apparatus, thereby improving reliability in each step of an automatic lower thread supplying apparatus. is there.

[0007]

Means for Solving the Problems To solve the above problems, the invention according to the first aspect of the present invention, as shown in FIGS. 1 and 6, for example, holds and releases a bobbin case (40) for accommodating a bobbin. The gripper (chuck 1) provided with the yarn end holding member (7, FIG. 3) capable of holding the yarn end extended from the bobbin case, and the bobbin case gripped by the gripper are moved by a predetermined movement. Transport means (rotating means 21 and linear motion means 30) for transporting along the path;
2) The bobbin case accommodating the used bobbin is taken out from the bobbin case, and the bobbin case accommodating the bobbin around which the bobbin thread is wound is attached to the sewing machine hook. A yarn end extending from the bobbin case is held by a yarn end holding member with respect to a bobbin case provided near the end guide position A) and held at the predetermined position by the holding portion. Air output means (third air nozzle 6) for applying air to the bobbin thread, and transport means so as to temporarily stop the bobbin case at the predetermined position, and output air from the air output means when the bobbin case is temporarily stopped. Control means (CPU 71) for performing such control.

According to the first aspect of the present invention, under the control of the control means, the bobbin case conveyed to the conveyance means temporarily stops at the predetermined position, at which time air is output by the air means. Therefore, the yarn end extending from the bobbin case is guided by the air, and is held by the yarn end holding member provided on the grip portion, so that the yarn end is located in an undesirable direction or between the members. It is possible to prevent a habit from being caused by being pinched.

The invention described in claim 2 is, for example, shown in FIG.
As shown in FIG. 3, a bobbin case (4
A gripper (chuck 1) for gripping and releasing the side opposite to the open side of (0), a thread end holding member (7) provided on the gripper and capable of holding a thread end extending from the bobbin case, and a gripper Conveying means (rotating means 21 and linear moving means 30) for conveying the bobbin case gripped by the section along a predetermined moving path.
And a bobbin thread extending from the bobbin case is provided near a predetermined position on the movement path, and is held by a gripper and stopped at the predetermined position. And an air output means (third air nozzle 6) for applying air to the lower thread so as to be held by the bobbin case. The bobbin case accommodating the used bobbin is taken out of the sewing machine pot (52), and the lower thread is wound. A bobbin changing device (20) for mounting a bobbin case containing a bobbin to a sewing machine hook.
In the above, the air outlet of the air output means blows the lower thread from the open side of the bobbin case stopped at the predetermined position by the gripping portion, through the thread lead-out portion (42), and above the yarn end holding member. It is arranged to generate a flowing air flow,
The air flow blows at least onto the bobbin case peripheral surface (44) having the yarn lead-out portion and the bobbin case open surface (45).

According to the second aspect of the present invention, the bobbin thread extending from the thread lead-out portion of the bobbin case is released by air generated from the air outlet of the air output means provided on the open side of the bobbin case. It will flow above the thread end holding member on the upper side of the gripper on the side opposite to the side. Therefore, when the output of the air is stopped, the yarn end naturally falls on the yarn end holding member by its own weight and is caught. Also, if air is blown at an angle that hits only the peripheral surface of the bobbin case, the yarn will flow in a direction along the peripheral surface, but the air flow will open at least the bobbin case peripheral surface where the yarn outlet is located and the bobbin case opening. Since it is sprayed on the surface, it is easy to be blown toward the yarn end holding member.

According to a third aspect of the present invention, in the bobbin exchanging apparatus according to the first or second aspect, the conveying means is configured to remove the bobbin case accommodating the used bobbin from the sewing machine immediately after removing the bobbin case. , The bobbin case is temporarily stopped, and when the bobbin case is temporarily stopped, the air output means outputs air for a certain period of time.

According to the third aspect of the present invention, since air is blown to the bobbin case accommodating the used bobbin to securely hold the yarn end to the yarn end holding member, the used bobbin can be treated. Can be done reliably,
For example, it is possible to improve the reliability of the remaining yarn removing process for removing the lower thread remaining on the bobbin.

According to a fourth aspect of the present invention, in the bobbin exchanging apparatus according to any one of the first to third aspects, the transporting means comprises:
Immediately before mounting the bobbin case accommodating the bobbin around which the bobbin thread is wound on the sewing machine hook, the bobbin case is temporarily stopped at the predetermined position, and at the time of the temporary stop, the air output means outputs air for a certain period of time. And

According to the fourth aspect of the present invention, air is blown immediately before the bobbin case accommodating the bobbin around which the bobbin is wound, and the yarn end is securely held by the yarn end holding member. In addition, the direction and state of the thread end are in a good state, and the upper thread and the lower thread can be securely entangled at the start of sewing, thereby improving the work reliability.

[0015] In the bobbin changing device according to any one of the first to fourth aspects, the air output of the air output means may be variable as in the invention according to the fifth aspect. If the output of the air is variable as in claim 5, the output of the air can be adjusted to an appropriate level and controlled so as to be reliably held by the yarn end holding member. Also, when air is output from the open side of the bobbin case as in claim 2, the bobbin may turn if the air is too strong. Can also be prevented.

In the bobbin changing apparatus according to any one of the first to fifth aspects, as in the invention according to the sixth aspect, a selection means (selection switch 77) for selecting whether or not to output air by the air output means. May be provided. If the air output by the air output means can be selected as in claim 6, if there is no problem even if the air is not guided by the material of the yarn, the air output is not performed and the temporary stop at the predetermined position is also omitted. Therefore, the process time can be shortened accordingly.

According to a seventh aspect of the present invention, there is provided a bobbin changing device (20) according to any one of the first to sixth aspects, as shown in FIGS. 1 and 6, and a bobbin thread remaining on a used bobbin. And a lower thread winding device (76) for winding the lower thread around the bobbin from which the lower thread has been removed by the residual thread removing device, and a lower thread wound by the lower thread winding device. A standby portion (dummy position 33) for waiting for a bobbin case accommodating the bobbin that has been placed, and the bobbin case is moved by the bobbin exchange device to the sewing machine shuttle (52),
An automatic lower thread feeding device (100), which is transported to each position of a lower thread winding device and a standby unit.

According to the present invention, the bobbin case conveyed to the conveying means is temporarily stopped at the predetermined position under the control of the control means, and air is output by the air means at that time. Since the yarn end extending from the bobbin case is guided by the air and is held by the yarn end holding member provided in the gripping portion, the yarn end may be located in an unfavorable direction or may be moved to a member around the gripping portion. It can prevent sticking and habits. Therefore, if necessary, the bobbin case is stopped at the predetermined position and the air output is performed, whereby each operation in the lower thread automatic supply device is smoothly performed, and the reliability of the operation is improved.

According to an eighth aspect of the present invention, in the automatic lower yarn supplying device according to the seventh aspect, the lower yarn remaining on the bobbin could not be caught in the residual yarn removing process by the residual yarn removing device. In this case, the bobbin case accommodating the bobbin is conveyed to the predetermined position and temporarily stopped. After the bobbin case is temporarily stopped, air is output for a certain period of time by the air output means, and then the bobbin case is conveyed again to the residual yarn removing device and the residual yarn is conveyed. A removal process is performed.

According to the eighth aspect of the present invention, when the bobbin remaining in the used bobbin cannot be caught by the residual yarn removing device and the bobbin cannot be processed, the bobbin case accommodating the bobbin. Is transported to the predetermined position and temporarily stopped, and air is output for a certain period of time by the air output means at the time of the temporary stop, so that the yarn end is held by the yarn end holding member of the gripping portion and is securely guided to the predetermined position. Then, since the remaining yarn removing process is performed again, the remaining yarn removing process can be performed reliably, and the reliability can be improved.

According to a ninth aspect of the present invention, in the automatic bobbin thread supplying device according to the seventh or eighth aspect, after the bobbin is wound on the bobbin by the bobbin winding device, the bobbin case accommodating the bobbin is on standby. Before being conveyed to the section, the sheet is conveyed to the predetermined position and temporarily stopped, and at the time of the temporary stop, air is output by air output means for a certain period of time.

According to the ninth aspect of the present invention, air is applied by the air output means at the predetermined position before the bobbin after winding the bobbin is conveyed to the standby section. Furthermore, when the sewing machine is detached from the standby section and mounted on the sewing machine hook, the thread ends are in a good state, and operations such as entanglement of the upper thread and the lower thread at the start of the next sewing can be reliably performed.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. The automatic lower thread feeding device 100 shown in FIGS. 1 and 2 is provided below a sewing machine bed 51 of a sewing machine having a needle 50. A shuttle 52 is provided on the sewing machine bed 51 on the movement locus of the sewing needle 50, and a holding shaft 5 for holding a bobbin case is provided in the shuttle 52.
4 are provided. In addition to the bobbin changing device 20 and the remaining yarn removing device 10 described later,
Although a lower thread winding device and a thread hooking mechanism and a thread cutting mechanism attached to the lower thread winding device are provided, the description is omitted in the present embodiment since it is a known technique. The bobbin case and the bobbin used in the present invention are well known, and here, FIG.
The bobbin case 40 shown in FIG. The bobbin case 40 is provided with a lever 41 and a latch 43, and accommodates a bobbin (not shown) inside. When the lever 41 is closed from the opened state, the bobbin case 40 is latched.
The latch hole 43a formed on the hook 52 is attached to the shuttle 52 by engaging with the holding shaft 54. Further, when the lever 41 is rotated and released (on the front side in FIG. 4), the engagement by the latch hole 43a is released, and the latch 43 is engaged with the internal bobbin, so that the bobbin together with the bobbin can be detached. Becomes
Further, on the peripheral surface of the bobbin case 40, there is provided a yarn lead-out portion 42 which is a hole for drawing out the yarn wound on the internal bobbin.

The bobbin exchanging device 20 is mainly rotatable together with a rotating means 21 and a linear moving means 30 which are conveying means, and further with a supporting shaft 22 by the rotating means 21 and supported by the linear moving means 30. A rotating arm 23 configured to be able to move directly along the axial direction of the shaft 22. The rotation means 21 includes a motor 24, a belt 25 rotated by the motor 24, and a pulley 26 on which the belt 25 is hung and fixed to a support shaft 22 formed of a spline shaft. As a result, the support shaft 22 rotates. The rotation arm 23 is fixed to a spline nut 27a. The spline nut 27a is
Are mounted so as to be slidable in the axial direction and to rotate together with the support shaft 22. Therefore, the rotating arm 23 rotates in the same direction (the direction E or F in FIG. 1) together with the support shaft 22.

The translation means 30 includes a motor 31 and a belt 32 driven to rotate by the motor 31. The belt 32 is fixed to the transport ring 27 by a fixing member (not shown). Transfer ring 27
Is provided so as to be able to move directly along the support shaft 22 and not to follow the rotation of the support shaft 22.
Is connected to a spline nut 27a. Accordingly, when the motor 31 drives the belt 32 to rotate, the rotating arm 23 moves in the axial direction (C direction or D direction in FIG. 2) of the support shaft 22 via the transport ring 27, that is, linearly moves. ing.

The rotary arm 23 is provided with a chuck 1 as a grip for gripping the bobbin case 40. The chuck 1 also rotates or linearly moves together with the rotary arm 23. On the movement locus of the chuck 1, a dummy position (standby portion) 33 for holding the bobbin set with the lower thread and the bobbin case 40, and a residual thread for removing the remaining lower thread of the bobbin by the residual thread removing device 10. Each work position is provided as a removing position 34 and a bobbin winding position 35 for winding the bobbin around the bobbin. At the dummy position 33 and the remaining yarn removing position 34, the shuttle 5
A dummy shaft 36 and a remaining yarn shaft 37 having the same shape as the holding shaft 54 in 2 are provided.

The chuck 1 is provided with a cylinder 84 (FIG. 6) and a claw (not shown). When the claw is rotated by the cylinder 84, the chuck engages with the lever 41 of the bobbin case 40 to open the lever 41. Thus, the chuck 1 can grip the bobbin case 40 together with the bobbin. Further, the chuck 1 is provided with a thread end holding member 7 as shown in FIG. The thread end holding member 7 is formed, for example, by cutting an artificial turf into small pieces, and when the lower thread T adheres thereto, it is held as it is. With the yarn end extending from the bobbin case 40 held by the chuck 1 held by the yarn end holding member 7, the bobbin case 40 is
2 and the dummy shaft 36 and the remaining yarn shaft 37, the bobbin thread hangs in the vicinity of the lever 41 side without being pinched or broken by an inappropriate portion, and the next work is performed. It can be done smoothly.

The bobbin replacing device 20 is provided with a first air nozzle 4, a second air nozzle 5, and a third air nozzle 6. First air nozzle 4, second air nozzle 5
Are the first solenoid valve 81 (FIG. 6) and the second solenoid valve 8 respectively.
2, and the air supplied from a compressor (not shown) is output when these solenoid valves are opened. The first air nozzle 4 is located at the dummy position 33.
Near the dummy shaft 36 and substantially in the tangential direction of the bobbin case peripheral surface mounted on the dummy shaft 36, and mounted opposite the open surface side of the bobbin case 40. I have. When the air is output from the first air nozzle 4, the yarn from the yarn lead-out portion 42 of the bobbin case mounted on the dummy shaft 36 flows in a tangential direction on the bobbin case peripheral surface.

The second air nozzle 5 is provided in the vicinity of the dummy position 33 and opposed to the first air nozzle 4, and is provided on the open surface side of the bobbin case 40 with respect to the bobbin case 40 mounted on the dummy shaft 36. To output air. When the air is output from the second air nozzle 5, the yarn from the yarn lead-out portion 42 of the bobbin case mounted on the dummy shaft 36 is blown in a direction opposite to the open surface side of the bobbin case 40. Therefore, when the bobbin case 40 is held by the chuck 1, the thread T flows in a direction from the thread lead-out section 42 to adhere to the thread end holding member 7. When the first air nozzle 4 and the second air nozzle 5 are blown toward the lower thread T extending from the bobbin case 40 when the bobbin case 40 mounted at the dummy position 33 is mounted on the shuttle 52, the lower thread T The yarn end is turned to the open side of the bobbin case 40 when the yarn end is attached to the shuttle 52 to prevent the problem that the yarn end is pinched between the shuttle 52 and the bobbin case 40.

The third air nozzle 6 is an air output means in the present invention, and is provided near the yarn end guide position A on the movement locus of the bobbin case 40 conveyed by the chuck 1. The third air nozzle 6 is connected to a third solenoid valve 83 (FIG. 6), and outputs air supplied from a compressor (not shown) when the third solenoid valve 83 opens. The yarn end guide position A is a position halfway between the shuttle 52 and the dummy position 33 in both the linear movement direction and the rotation direction. When viewed from above, the outlet 6a of the third air nozzle 6 is provided on the open surface 45 side of the bobbin case 40 which is held by the chuck 1 and stopped at the position A as shown in FIG. To the peripheral surface 44 of the bobbin case 40. This oblique degree is a position where most of the air output from the third air nozzle 6 hits the peripheral surface 44 of the bobbin case 40 and slightly hits the open surface 45. In addition, as shown in FIG. 3 (b), the outlet 6a is
2 is provided.

Then, the air blown out from the third air nozzle 6 is output from below toward the yarn lead-out portion 42 of the bobbin case 40 and slightly outside the direction along the peripheral surface 44. Thereby, as shown in FIGS. 3A, 3B and 4, the lower thread T extending from the thread lead-out section 42 is blown up above the thread end holding member 7 of the chuck 1. In this state, if the output of the air from the third air nozzle 6 stops, the lower thread T falls under its own weight and is caught by the thread end holding member 7. The yarn T can be blown up onto the yarn end holding member 7 by blowing air at an angle such that the third air nozzle hits the peripheral surface 44 of the bobbin case 40 and slightly hits the open surface 45. If the angle of the air is such that the air does not hit the release surface 45 but hits only the peripheral surface 44, the yarn T flows from the yarn lead-out portion 42 in a direction along the peripheral surface 44, and is caught by the yarn end holding member 7. Will not be. Also, if the air hits the opening surface 45 too strongly, the bobbin inside will turn and there is a possibility that a problem may occur in the next step. More specifically, the air blown to the bobbin case peripheral surface 44 and the open surface 45 is blown out while being diffused from the nozzle opening diameter,
Preferably, 50 to 80% of the air is blown so as to impinge on the bobbin case peripheral surface 44 having the yarn lead-out portion 42.

As shown in FIG. 4, the third air nozzle 6 is provided with a speed controller 6b so that the flow rate of air can be controlled appropriately. here,
An appropriate flow rate is, for example, about 1 to 2 liters per minute when the diameter (φ) of the outlet 6a is 3 mm. If the flow rate is too large, there are inconveniences such as the bobbin rotating as described above and the yarn T not being blown up onto the yarn end holding member 7 even if the direction of the outlet 6a is appropriate. Sometimes. If the amount is too small, the yarn T cannot be guided in a preferred direction. The output time of the air is adjusted by opening and closing the third solenoid valve 83. Specifically, the output time depends on the type of yarn, the diameter of the nozzle, and the like. Even if it is too short, the lower thread T cannot be guided to a desired position,
If the length is too long, the yarn ends may be undesirably separated. Further, the output of the air from the third air nozzle 6 can be selected by a selection switch 77 (FIG. 6).

The residual yarn removing device 10 shown in FIG. 5 is driven by the residual yarn winding motor 17 (FIG. 6), the driving roller 13 driven by the residual yarn winding motor 17, and the driven roller 13 in contact with the driving roller 13. The driven roller 14, the driven roller 14 is rotatably mounted, and the rotating arm 15 is rotatable about a shaft 16. The yarn end of the lower thread T is generated between the driving roller 13 and the driven roller 14 by generating an air shower. Nozzle 12, a suction nozzle 11 for sucking and collecting the drawn-out residual yarn by air, a dust bag 11c for storing the removed residual yarn, and a bobbin provided near the residual yarn shaft 37 to rotate the bobbin during the residual yarn processing. Bobbin rotation detecting means 18 for detecting
(FIG. 6). In the residual yarn removing device 10, when the residual yarn winding motor 17 rotates, the driving roller 13
The rotation arm 15 rotates in a direction opposite to the rotation direction of the drive roller 13. In addition, the air nozzle 12
Blows air at a predetermined flow rate through the second voltage proportional valve 12a. The suction nozzle 11 causes the first voltage proportional valve 11a to supply a predetermined amount of air to the yarn suction path 11b.
Suction is performed by being blown out in the opposite direction to 1. When the bobbin thread T is being pulled out from the thread lead-out section 42 of the bobbin case 40 mounted on the remaining thread shaft 37 (FIG. 5A), the driven roller 14 moves and the air nozzle 12 is generated. Air shower
The yarn end of the bobbin thread T is guided between the driving roller 13 and the driven roller 14 (FIG. 5B), and the remaining end is drawn by the suction nozzle 11 while the yarn end is pulled out by the driving roller 13 and the driven roller 14. The yarn is sucked (FIG. 5C), and the yarn remaining on the bobbin in the bobbin case 40 is removed.

FIG. 6 shows a control circuit 70 of the lower thread automatic supply device 100. The control circuit 70 mainly includes a CPU (Cent
ral Processing Unit) 71, a ROM (Read Only Memory) 72 connected to the CPU 71, and a RAM (Random A
ccess Memory) 73, I / O port 74, and I / O
Lower thread detecting means 75, lower thread winding device 76, residual thread removing device 10, bobbin replacing device 20 connected via port 74
Etc. The ROM 72 stores a control program and control data for the bobbin thread automatic supply device 100.
M73 stores data, calculation results, and the like.
The PU 71 controls the operation of the automatic lower thread supply device 100 using the RAM 73 as a work area based on programs and data in the ROM 72. The bobbin thread detecting means 75 detects that the remaining amount of the bobbin thread in the bobbin case 40 mounted on the shuttle 52 has reached a predetermined amount while counting the number of stitches of the sewing machine.

The bobbin changing device 20, the lower thread winding device 76,
The residual yarn removing device 10 is connected to a CPU via an I / O port 74.
It is controlled and driven by 71. The bobbin exchange device 20
A bobbin exchanging device driving unit 80 including drivers for driving the first to third solenoid valves 81, 82, 83, the speed controller 6b, the cylinder 84, and the motors 24, 31.
The bobbin changing device driving section 80 is controlled by the CPU 71. The residual yarn removing means 10 includes a residual yarn removing device driving unit 19 including drivers for driving the residual yarn winding motor 17, the first voltage proportional valve 11a, and the second voltage proportional valve 12a. The device driving section 19 is controlled by the CPU 71.

The CPU 71 controls the motors 24 and 31 so that the bobbin case 4
0 is temporarily stopped when it reaches the position A in the middle of being conveyed to the remaining yarn removing position 34. When the bobbin case 40 having the bobbin wound with the bobbin thread is conveyed to the dummy position 33 at the bobbin winding position 35, the bobbin case 40 is first conveyed to the position A, temporarily stopped, and then conveyed to the dummy position 33. ing. Further, when the bobbin case 40 is transported from the dummy position 33 to the shuttle 52, the bobbin case 40 is temporarily stopped at the intermediate position A. in addition,
Even when the lower thread T fails to be clamped in the residual thread removal processing described later, the bobbin case is transported to the thread end guide position A, where it is temporarily stopped. Then, the CPU 71 controls the third solenoid valve 83 so that the third air nozzle 6 outputs air to the bobbin case 40 once stopped at the position A for a certain period of time. The selection switch 77 is provided on an operation panel (not shown), and is used by an operator to select whether or not to output air by the third air nozzle 6.

The automatic lower yarn feeding device 10 having the above configuration
The lower thread automatic supply process at 0 will be described based on the flow of FIG. In the description here, the bobbin case first set in the shuttle 52 is the bobbin case 40, and then the shuttle 52
Is set as a bobbin case 40 '. First, this processing is started from the sewing operation in step S1.
During the sewing operation, it is determined in step S2 whether the bobbin in the shuttle 52 needs to be replaced. If it is not necessary to replace the bobbin, this determination is repeated, and when the lower thread detecting means 75 detects that the lower thread has become less than a predetermined amount,
Move to step S3. In step S3, a process for determining whether or not the operation of the sewing machine has been stopped is performed. If it is determined that the sewing machine has been stopped, the process proceeds to step S4, where processing for inhibiting the sewing operation of the sewing machine is performed.

Next, in step S5, a process of taking out the bobbin case 40 from the shuttle 52 is performed. That is,
The motor 24 is driven to position the rotating arm 23 in front of the shuttle 52, and the motor 31 is driven to move the rotating arm 23 forward to approach the shuttle 52. When the chuck 1 at the tip of the rotating arm 23 approaches the bobbin case 40 in the shuttle 52, the cylinder 84
, The lever 41 is opened by the claw portion, and the bobbin case 40 is gripped together with the bobbin.
Is retracted by a predetermined distance, and the process proceeds to step S6.

In step S6, the bobbin case 40 taken out in step S5 is moved to the yarn end guide position A and a process of applying air by the third air nozzle 6 is performed.
That is, after the rotation arm 23 is retracted by the predetermined distance in step S5, the rotation arm 23 is rotated by the predetermined angle, and the bobbin case 40 is stopped at the yarn end guide position A. Here, while controlling the third solenoid valve 83 and the speed controller 6b, air is supplied from the third air nozzle 6 for a predetermined time (for example, 0.5
(Seconds), and the lower thread T is blown up as shown in FIG. When the output of the air is stopped, the yarn end of the lower thread T falls by its own weight and is naturally held by the yarn end holding member 7 on the chuck 1. Next, in step S <b> 7, the rotary arm 23 is retracted and rotated, and the bobbin case 40 is transported to the remaining yarn removing position 34 and mounted on the remaining yarn shaft 37.

Next, the process proceeds to step S8, in which the bobbin case 40 'in which the bobbin thread has been wound and set at the dummy position 33 is removed from the dummy shaft 36, transported to the yarn end guide position A, and stopped there temporarily. As in step S6, a process of applying air by the third air nozzle 6 is performed, and the yarn end extending from the bobbin case 40 'is held by the yarn end holding member 7. Next, in step S9, the bobbin case 4
0 ′ is transported to the shuttle 52 and mounted. Then, step S
At 10, a process for permitting the operation of the sewing machine is performed. That is, the operator is notified that the bobbin thread has been replenished, and the operator receives this notification and starts the sewing operation of step S1 again. The processing after step S11 is performed in parallel with this sewing operation. Next, in step S11, a residual yarn removing process of the bobbin case 40 mounted on the residual yarn shaft 37 in step S7 is performed. This will be described later.

After the remaining yarn removing process, the bobbin case 40 is conveyed to the lower bobbin winding position 35 in step S12, and the lower bobbin winding process is performed by the lower bobbin winding device 76 in step S13. Wrap. Next, in step S14, the lower thread is pulled out from the thread lead-out section 42 of the bobbin case 40 by the thread hooking process by the thread hooking mechanism. Thereafter, in step S15, a thread cutting process for cutting the thread between the thread supply source and the bobbin is performed by the thread cutting mechanism. Then, the process proceeds to step S16,
Here, the bobbin case 40 is transported to the yarn end guide position A, and a process of applying air by the third air nozzle 6 is performed as in steps S6 and S8. Next, in step S17,
After performing the process of transporting the bobbin case 40 to the dummy position 33, the flow returns to step S1.

FIG. 8 shows the residual yarn removing process in step S11 of FIG. Here, the rotation direction of the remaining yarn winding motor 17 when the drive roller 13 is rotated clockwise in FIG. 5 is defined as a forward direction, and the reverse direction is defined as a reverse direction. This process is performed when the driving roller 13 and the driven roller 14 are in contact with each other (FIG. 5A).
State). From this state, in step J1, the remaining yarn winding motor 17 is driven in the reverse direction to rotate the drive roller 13 in the counterclockwise direction, and to rotate the rotating arm 15 clockwise about the shaft 16 by 90 °. . As a result, as shown in FIG.
3, the driven roller 14 is opened, and a space is generated between the driving roller 13 and the driven roller 14. Next, in step J2, an air shower is blown from the air nozzle 12 to guide the lower thread T hanging from the bobbin case 40 to the drive roller 13 side, and the lower thread is sucked by the suction nozzle 11 in step J3.

Next, the remaining yarn winding motor 17 is rotated in the forward direction, the driving roller 13 is rotated clockwise, and the rotating arm 15 is rotated counterclockwise to move the driven roller 14 toward the driving roller 13. When the rotary arm 15 is closed at 45 ° from 90 °, the remaining yarn winding motor 17
Is stopped (step J4).

Next, the remaining yarn winding motor 17 is moved to step J.
4 Similarly, drive in the forward direction, rotate the drive roller 13,
When the rotation arm 15 is further closed by 30 ° from the above angle, the remaining yarn winding motor 17 is stopped (step J5).
Further, in Step J6, the remaining yarn winding motor 17 is driven in the forward direction, and the rotating arm 15 is further rotated by 15 ° from the above angle.
Performs a process to stop when closed. At this time, FIG.
As shown in (1), the driven roller 14 returns to the original position and comes into contact with the drive roller 13, and the thread end of the lower thread T is held between the rollers 13 and 14. As described above, the driven roller 1
When the lower thread 4 and the drive roller 13 are gradually and gradually closed from the open state, and the lower thread T is guided by the air nozzle 12 during that time, the remaining thread can be reliably pinched between the drive roller 13 and the driven roller 14.

Next, in step J7, the remaining yarn winding motor 17 is driven in the forward direction to
Is rotated clockwise to pull out the remaining yarn in cooperation with the driven roller 14, and the bobbin in the bobbin case 40
After the second rotation, the remaining yarn winding motor 17 is stopped.
When the remaining yarn winding motor 17 is driven as in step J7, the driven roller 14 presses the driving roller 13 via the rotating arm 15, but when the pressing force of the rotating arm 15 exceeds a certain level, the driven roller 14 escapes. Thus, the driven roller 14 sufficiently contacts the driving roller 13 so that an excessive force is not applied. Then, step J7
Similarly to the above, the remaining yarn winding motor 17 is driven to rotate in the forward direction and then stopped (step J8).

Next, in step J9, it is determined from the detection result of the bobbin rotation detecting means 18 whether or not the bobbin in the bobbin case 40 has made one rotation in steps J7 and J8. If the bobbin thread T is pulled out and is caught between the driving roller 13 and the driven roller 14, the bobbin rotates, so that the bobbin is in a normal state and the process proceeds to step J10. If it is determined that the bobbin is not rotating, the lower thread T
The thread is not drawn out between Nos. 3 and 14, that is, the remaining thread processing cannot be performed. In this case, the process proceeds to step J20.

Then, in step J20, it is determined whether or not the operation of clamping the yarn end in steps J1 to J6 has been performed a specified number of times. In the present embodiment, the specified number of times is three, and if the number is less than three, Moves to step J24. In step J24, the bobbin case 40 is transported to the yarn end guide position A, where it is temporarily stopped, and air is applied for a predetermined time by the third air nozzle 6 as in step S6 in FIG. Then, in step J25, the bobbin case 40 is transported again to the remaining yarn removing position 34, and the remaining yarn shaft 3
Set to 7. After step J25, step J again
It returns to 1 and the clamp operation is restarted.

On the other hand, if it is determined in step J20 that the clamping operation has been performed three times, the blowing of the air shower from the air nozzle 12 is stopped (step J2).
1) The lower thread suction of the suction nozzle 11 is stopped (step J22), and an error display is displayed on the operation panel (step J23), assuming that some trouble that cannot remove the remaining thread has occurred (step J23). If it is determined in step J9 that the bobbin is rotating, it is determined in step J10 whether a series of operations in steps J1 to J9 has been performed a specified number of times. If the number is less than the specified number, the process returns to step J1. In this way, by repeating the operations of steps S1 to S9 a plurality of times, it is possible to prevent the yarn end of the yarn having a wide range of properties from sticking to the roller and to reliably remove the remaining yarn. The specified number of times is three in this embodiment.

Next, if it is determined in Step J10 that the repetition has been performed the specified number of times, in Step J11, the remaining yarn winding motor 1
7 is driven at a low speed. Next, in step J12, it is determined whether or not the bobbin has been driven by one rotation. If the bobbin has not been driven by one rotation, this determination is repeated until the bobbin is driven by one rotation. If the bobbin has been driven by one rotation, the remaining yarn winding motor 17 is driven at a medium speed (step J13), and it is determined in step J14 whether or not the bobbin has been driven by one rotation.
If the motor is not driven for one rotation, this determination is repeated until the motor is driven for one rotation. In addition, when driven by one rotation,
The remaining yarn winding motor 17 is driven at a high speed (step J1).
5). As described above, when the rotation speed of the motor 17 is controlled stepwise from a low speed to a high speed, it is possible to prevent the line from being violated and to shorten the discharge time.

Next, at step J16, it is determined whether or not the bobbin thread runs out and rotation of the bobbin has stopped. If the rotation has stopped, the process proceeds to step J17. The lower thread T extracted from the bobbin accumulates in the dust bag 11c. Next, in step J17, the blowing of the air shower from the air nozzle 12 is stopped, and in step J18, the suction of the suction nozzle 11 is stopped. In step J19, the remaining yarn winding motor 17 is stopped, and this process is terminated.

According to the lower bobbin thread automatic feeding device 100 and the bobbin exchanging device 20, before the remaining yarn removing process as in step S6 of FIG. 7 or before the yarn is conveyed from the dummy position 33 to the shuttle 52 (step S8). ), And before transporting to the dummy position 33 after the lower thread winding process (step S16),
Each bobbin case is temporarily stopped at the yarn end guide position A,
Air is blown by the third air nozzle 6 for a certain period of time, and the yarn end is held by the yarn end holding member 7 of the chuck 1. Therefore, the bobbin thread T is not caught by the lever 41 or caught between the bobbin case and the shuttle 52, so that the bobbin thread T is not attached to the members constituting the chuck 1 or the like. And the next process can proceed smoothly.

Specifically, after the bobbin winding process, the dummy shaft 3
6 or detached from the dummy shaft 36 and
Since air is blown by the third air nozzle 6 when the sewing machine is mounted on the sewing machine, the direction and state of the yarn end are in a good state, and the upper thread and the lower thread can be securely entangled at the start of sewing, thereby improving reliability. Also, before transporting to the remaining yarn removing position 34,
Since the air is blown as in step S6 in FIG. 7, the yarn end is held by the yarn end holding member 7, and the yarn end can be reliably clamped at the time of the remaining yarn removing process, and the reliability in the remaining yarn removing process can be improved. Is improved. Even if the clamping fails, it moves to the yarn end guide position A again and blows air as shown in step J24 in FIG.
The residual yarn removal processing can be performed more reliably.

Further, since the air output by the third air nozzle 6 can be selected by the selection switch 77, it may be omitted if not necessary according to the properties of the yarn and the like, and the process time can be shortened accordingly. For example, any one of steps S6, S8, S16 in FIG. 7 and step J24 in FIG. 8 may be deleted, or may be omitted altogether in some cases. Before the bobbin case at the dummy position 33 is conveyed to the yarn end guide position A in step S8 in FIG. 7, the first air nozzle 4 is output, and then the second air nozzle 5 is output. The end of the yarn may be guided to the other end. After this, if the third air nozzle 6 is further sprayed at the yarn end guide position A, the first air nozzle 4,
Even when the yarn end is not caught by the yarn end holding member 7 even by the second air nozzle 5, it is possible to reliably catch the yarn end.

The present invention is not limited to the above embodiment,
The specific shape and structure can be changed as appropriate. For example, the position of the third air nozzle 6 may be another position on the transport path, and the direction in which the air is blown may be changed according to the position or shape of the yarn end holding member 7.

[0055]

According to the first aspect of the present invention, under the control of the control means, the bobbin case conveyed to the conveyance means temporarily stops at the predetermined position, at which time air is output by the air means. . Since the yarn end extending from the bobbin case is guided by the air and held by the yarn end holding member provided on the grip portion, the yarn end may be located in an unfavorable direction or may be pinched between the members. It is possible to prevent the habit from being added due to looseness and to maintain the yarn end in a desired state.

According to the second aspect of the present invention, the lower thread extending from the thread lead-out portion of the bobbin case is released by air generated from the air outlet of the air output means provided on the open side of the bobbin case. It will flow above the thread end holding member on the upper side of the gripper on the side opposite to the side. Therefore, when the output of the air is stopped, the yarn end naturally falls on the yarn end holding member by its own weight and is caught. Also, if air is blown at an angle that hits only the peripheral surface of the bobbin case, the yarn will flow in a direction along the peripheral surface, but the air flow will open at least the bobbin case peripheral surface where the yarn outlet is located and the bobbin case opening. Since it is sprayed on the surface, it is easy to be blown toward the yarn end holding member.

According to the third aspect of the present invention, since air is blown onto the bobbin case accommodating the used bobbin to securely hold the yarn end on the yarn end holding member, the used bobbin can be treated. Can be done reliably,
For example, it is possible to improve the reliability of the remaining yarn removing process for removing the lower thread remaining on the bobbin.

According to the fourth aspect of the present invention, air is blown immediately before the bobbin case accommodating the bobbin around which the bobbin thread is wound is attached to the shuttle so that the thread end is securely held by the thread end holding member. In addition, the direction and state of the thread end are in a good state, and the upper thread and the lower thread can be securely entangled at the start of sewing, thereby improving the work reliability.

If the output of the air is variable as in claim 5, the output of the air can be adjusted to an appropriate level and controlled so that the yarn end holding member can reliably hold the air. Also, if too strong air is output from the open side of the bobbin case, the bobbin may be turned. However, by setting the output of the air to an appropriate level, it is possible to prevent the bobbin from running idle. If the air output by the air output means can be selected as in claim 6, if there is no problem even if the air is not guided by the material of the yarn, the air output is not performed and the temporary stop at the predetermined position is also omitted. Therefore, the process time can be shortened accordingly.

According to the seventh aspect of the present invention, under the control of the control means, the bobbin case conveyed to the conveyance means temporarily stops at the predetermined position, and at that time air is output by the air means. The yarn end extending from the bobbin case is guided by the air, and is held by a yarn end holding member provided on the grip portion. Therefore, it is possible to prevent the yarn end from being located in an unfavorable direction, sticking to a member around the gripping portion, and thereby giving a habit. Therefore, if necessary, the bobbin case is stopped at the predetermined position and the air is output, so that the subsequent process can proceed smoothly, and the reliability of each operation in the automatic lower thread supply device is improved.

According to the eighth aspect of the present invention, when the bobbin remaining in the used bobbin cannot be caught by the residual yarn removing device and the bobbin cannot be processed, the bobbin case accommodating the bobbin. Is transported to the predetermined position and temporarily stopped. At this temporary stop, air is output by the air output means for a certain period of time, so that the yarn end is held by the yarn end holding member, and then the remaining yarn removing process is performed again. Therefore, the remaining yarn removal processing can be performed reliably, and the reliability can be improved.

According to the ninth aspect of the present invention, air is applied by the air output means at the predetermined position before the bobbin after winding the bobbin is conveyed to the standby section. Furthermore, when the sewing machine is detached from the standby section and mounted on the sewing machine hook, the thread ends are in a good state, and operations such as entanglement of the upper thread and the lower thread at the start of the next sewing can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an automatic lower thread supply device including a bobbin exchange device according to the present invention.

FIG. 2 is a side view of the lower thread automatic supply device of FIG. 1;

3A and 3B show how a bobbin thread extending from a bobbin case is guided by air from a third air nozzle, and FIG.
Is a plan view from above, and (b) is a side view.

FIG. 4 is a perspective view showing a state in which a bobbin thread extending from a bobbin case is guided by air from a third air nozzle.

5A and 5B are plan views showing the residual yarn removing device, wherein FIG. 5A shows a state before clamping the yarn end, FIG. 5B shows a state in which the yarn end is guided toward the suction nozzle, and FIG. Fig. 3 shows a state in which the yarn end is held between two rollers.

FIG. 6 is a block diagram showing a control circuit of the lower thread automatic supply device of FIG. 1;

FIG. 7 is a flowchart showing a lower thread automatic supply process by the lower thread automatic supply device of FIG. 1;

FIG. 8 is a flowchart showing a residual yarn removing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chuck (grip part) 4 1st air nozzle 5 2nd air nozzle 6 3rd air nozzle (air output means) 6a Blow-out port 6b Speed controller 7 Thread end holding member 10 Residual thread removing device 20 Bobbin exchanging device 21 Rotating means (conveying means) 30 linear motion means (transporting means) 33 dummy position (standby portion) 34 residual yarn removing position 35 bobbin winding position 36 dummy shaft 37 residual yarn shaft 40 bobbin case 42 thread deriving portion 52 shuttle 54 holding shaft (suspension shaft) 70 Control circuit 71 CPU (control means) 76 Lower thread winding device 77 Selection switch A Thread end guide position T Lower thread

Claims (9)

[Claims] 1. A bobbin case holding and holding a bobbin case accommodating a bobbin, and provided with a yarn end holding member capable of holding a yarn end extending from the bobbin case, and a bobbin case gripped by the gripping portion. And a transport means for transporting the bobbin case after use from the sewing machine hook, and mounting the bobbin case housing the bobbin around which the bobbin thread is wound to the sewing machine hook. In the bobbin exchanging device, a yarn end extending from the bobbin case is provided near a predetermined position on the moving path, and is extended from the bobbin case with respect to a bobbin case held by a gripping portion and stopped at the predetermined position. Air output means for applying air to the lower thread so as to be held by the holding member; and transport means for controlling the bobbin case to temporarily stop at the predetermined position. And a control means for controlling the air output means to output air when the bobbin is temporarily stopped. A holding portion for holding and releasing a bobbin case opposite to the open side of the bobbin case, a yarn end holding member provided on the holding portion and capable of holding a yarn end extending from the bobbin case; A transporting means for transporting the bobbin case gripped by the gripping section along a predetermined moving path; provided near a predetermined position on the moving path, being gripped by the gripping section and stopped at the predetermined position. Air output means for applying air to the bobbin thread so that the bobbin thread extending from the bobbin case is held by the thread end holding member with respect to the bobbin case; A bobbin case for accommodating a bobbin around which a bobbin thread is wound, and attaching the bobbin case to a sewing machine hook. From the open side of the bobbin case that is stopped at the position, is arranged to generate an air flow that blows a lower thread through the yarn lead-out portion and above the yarn end holding member, and the air flow is at least at the yarn lead-out portion. A bobbin changing device for spraying a bobbin case peripheral surface and a bobbin case open surface having a hole. 3. The transport means stops the bobbin case once at the predetermined position immediately after taking out the bobbin case containing the used bobbin from the sewing machine. When the bobbin case is temporarily stopped, the air output means operates for a predetermined time. 3. The bobbin changing device according to claim 1, wherein 4. A transporting device comprising: a bobbin case accommodating a bobbin around which a bobbin thread is wound;
The bobbin changing device according to any one of claims 1 to 3, wherein the bobbin case is temporarily stopped at the predetermined position, and when the bobbin case is temporarily stopped, the air output means outputs air for a predetermined time. 5. The bobbin changing device according to claim 1, wherein the air output of said air output means is variable. 6. The apparatus according to claim 1, further comprising a selection unit for selecting whether to output air by the air output unit.
6. The bobbin changing device according to any one of items 5 to 5. 7. A bobbin exchanging device according to claim 1, a bobbin thread removing device for removing a bobbin thread remaining on a used bobbin, and a bobbin thread removed by the bobbin thread removing device. A bobbin winding device that winds a bobbin around a bobbin, and a standby unit that waits for a bobbin case that houses a bobbin around which the bobbin is wound by the bobbin winding device. An automatic lower thread feeding device, which transports the remaining yarn to a remaining yarn removing device, a lower yarn winding device, and a standby portion. 8. When the bobbin remaining in the bobbin cannot be caught in the residual yarn removing process by the residual yarn removing device, the bobbin case accommodating the bobbin is transported to the predetermined position and temporarily stopped. 8. The lower thread automatic feeder according to claim 7, wherein after the air is output by the air output means for a predetermined time at the time of the temporary stop, the bobbin case is transported to the residual thread removing device again to perform the residual thread removing process. . 9. After the bobbin is wound on the bobbin by the bobbin winding device, before the bobbin case accommodating the bobbin is conveyed to the standby portion, the bobbin case is conveyed to the predetermined position and temporarily stopped. 9. The lower thread automatic supply device according to claim 7, wherein air is output by air output means for a predetermined time.