JPH08191977A - Bobbin changer - Google Patents

Abstract

(57) [Abstract] [Purpose] Detecting at least one of a gripping failure and a release failure of the bobbin case gripping means prevents a subsequent failure and improves the reliability of the apparatus. A lock lever 2a of the bobbin case 2 is detected by a detection means 57, and an error detection means detects the lock lever 2a based on a detection signal from the detection means 57 when it is necessary to grip the bobbin case 2. If the open state of 2a is not detected, it is determined that the bobbin case gripping means 50 is not properly gripped. If the open state of the lock lever 2a is detected when the bobbin case 2 needs to be opened, it is determined that the bobbin case gripping means 50 is not properly opened. At least one of these defects is detected, and when these defects are detected, for example, the apparatus is stopped, and the defect is notified to an operator by, for example, an error notifying unit so that the operator can intervene. thing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin changing device.

[0002]

2. Description of the Related Art In a sewing machine for sewing using an upper thread and a lower thread, particularly for an industrial sewing machine that performs high-speed sewing work, it is necessary to frequently replace a bobbin wound with a lower thread. is there. Generally, when the lower thread is consumed, the operation of the sewing machine is temporarily stopped, the bobbin case is removed from the hook, and the bobbin newly wound with the lower thread is accommodated in the bobbin case.
The operation of mounting the bobbin case in the shuttle is performed manually. However, such manual replacement of the bobbin case is extremely inefficient and causes a decrease in productivity.

Therefore, the present applicant has attempted to solve the above problems in the bobbin exchanging device of the sewing machine described in Japanese Patent Application Laid-Open No. 6-304369. This bobbin changing device makes it possible to grip the bobbin case by raising the lock lever of the bobbin case accommodating the bobbin inside to the open position by the lever claw rotated by the drive of the air cylinder. The bobbin case gripping means that can open the bobbin case by returning the bobbin case to the closed position by the lever claw is provided, and the bobbin case in the hook is gripped by the bobbin case gripping means and pulled out from the hook. A bobbin case accommodating a completed bobbin is gripped by the bobbin case gripping means and mounted in the shuttle.

[0004]

However, the bobbin exchanging device for a sewing machine described in Japanese Patent Laid-Open No. 6-304369 has the following problems. That is, in the above device, it is not possible to know whether or not the bobbin case is normally gripped / opened by the gripping / opening operation of the bobbin case gripping means. If the bobbin case comes off, or if the bobbin case is not properly attached or removed, the next operation will continue and the device will not function properly, causing problems and reducing the reliability of the device. There is.

Therefore, the present invention provides a bobbin exchanging device capable of preventing the occurrence of a subsequent defect by detecting at least one of the gripping failure and the opening failure of the bobbin case gripping means and improving the reliability of the device. The purpose is to

[0006]

In order to achieve the above object, the bobbin exchanging device according to a first aspect of the present invention is capable of gripping the bobbin case by raising a lock lever of the bobbin case accommodating the bobbin inside to an open position. The bobbin case can be opened by returning the lock lever to the closed position, and the bobbin case gripping means for moving the predetermined path is provided. The bobbin is provided inside the member facing the bobbin case gripping means. In a bobbin exchanging device in which the accommodated bobbin case is removable, at least a detection means for detecting an open state of the lock lever, and a gripping failure and a release failure of the bobbin case gripping means based on a detection signal from the detection means. Error detection means for detecting one of
Equipped.

[0007]

According to the bobbin changing device of the present invention, the open state of the lock lever of the bobbin case is detected by the detecting means, and the bobbin is detected by the error detecting means based on the detection signal from the detecting means. If the open state of the lock lever is not detected when the case needs to be gripped, it is determined that the bobbin case gripping means is not properly gripped, and if the open state of the lock lever is detected when the bobbin case needs to be opened, the bobbin case grips. It is determined that the means is open, at least one of these failures is detected, and when these failures are detected, for example, the device is stopped, and these failures are notified to the operator by, for example, error notification means, and the operator is notified. Intervention is made.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. 3 to 8 show the entire bobbin changing device of the present invention. 3 to 8,
Reference numeral 1 denotes a shuttle in which the bobbin case 2 is mounted, 1a denotes a shuttle shaft, and 3 denotes a base plate which is erected upright on a main base attached to the main body of the sewing machine and which is disposed immediately below the shuttle 1. A base end 4a of a carrier shaft 4 having an axis parallel to the shuttle shaft 1a is fixed to the base plate 3, and the carrier shaft 4 is cantilevered by the base plate 3.

On the tip 4b side (opposite to the base plate) of the conveying shaft 4, the conveying block 12 is formed so that the outer peripheral surface of the hollow cylinder is cut at two positions along the axial direction so that the cut surfaces face each other. (See FIG. 3) is rotatably and slidably supported on the transport shaft 4.

To each cut surface of the transport block 12, one plate-like portion of the transport plates 10, 10 bent into an L-shape is fixed, and the other of the L-shaped transport plates is formed. As shown in FIG. 3, the plate-shaped portions of the two are opposed to each other with the axis interposed therebetween.

One end of each of the holding portions 11, 11 bent toward the shuttle along the axial direction is fixed to each of the transport plates 10, 10, and the other of the holding portions 11, 11 is fixed. The bobbin case gripping means 50 as shown in FIG. 1 is fixed to each end (end facing the shuttle).
3 to 8, the bobbin case holding means 50 is omitted in order to avoid complication of the drawings. Next, regarding this bobbin case gripping means, FIG.
Will be described below with reference to FIG.

As shown in FIG. 1, a pair of both side plates 53a, 53 arranged substantially in parallel and fixed to the holding portion 11.
A rotating shaft 54, which is biased clockwise by a torsion coil spring 56 in the drawing, is rotatably provided between b, and the lock lever 2a of the bobbin case 2 is closed on the rotating shaft 54 ( 2 (a) and 2 (b)) to open and open position (see FIGS. 2 (c) and 2 (d)).
A lever claw 55 to be positioned at is attached. The lever claw 55 is curved in an arc shape, and the tip end portion of the lever claw 55 at the upper side in the drawing is inserted into the overlapping portion of the lock lever 2a of the bobbin case 2 and the bobbin locking plate 2b (see FIG. 2). It is arranged in a possible positional relationship. Further, the curved center portion of the lever claw 55 is fixed to the rotating shaft 54, and a long hole 55a is formed at the lower end portion in the drawing.

A plunger 51a of the solenoid 51 is arranged further on the front side of the figure than the side plate 53a on the front side of the figure. The plunger 51a includes a side plate 5 on the front side in the drawing.
A pin 52 projecting toward 3a is fixed, and the pin 52 is provided on the side plate 53a on the front side in the figure through a long hole (not shown) opened with the left-right direction in the figure as a longitudinal direction. Is movably fitted in the long hole 55a. The solenoid 51 is connected to the side plates 53.
It is fixed to a base plate 53c that is connected to a and 53b.

Therefore, when the solenoid 51 is not energized, the torsion coil spring 56 causes the tip end of the lever claw 55 to be in the retracted position as shown in FIGS. 2 (a) and 2 (b). The lock lever 2a of the bobbin case 2 is in the closed position. When the solenoid 51 is energized, the plunger 51a is pulled in, and the lever claw 55 rotates counterclockwise in the drawing with the rotation shaft 54 as a fulcrum.
The tip portion of 5 rotates according to the locus shown by the solid line P in FIG. 2B, and the rotation of the lever claw 55 causes the lock lever 2a of the bobbin case 2 to move as shown in FIG. 2B. It is rotated and opened according to the locus shown by the two-dot chain line Q.

A base body 53d for receiving the opened lock lever 2a in the open position is provided between the side plates 53a and 53b. This base body 53
The lever receiving surface of d is formed as an inclined surface along the lock lever 2a in the open position, and a micro switch 57 as a detection means is embedded in the middle thereof. Then, the contact 57a of the micro switch 57
Is slightly projected from the receiving surface.

Therefore, when the lock lever 2a is opened and reaches the open position, the contact 57a is pressed, and the open state of the lock lever 2a can be detected by the contact 57a.

The lock lever 2a received by the base body 53d is clamped and fixed in an open state by the pressing force from the lever claw 55 so that the entire bobbin case 2 can be gripped. It has become.

By the way, as shown in FIGS. 3 to 6, a rotating gear 13 is fixed to the outer periphery of the carrying block 12. As shown in FIG. 4, a drive gear 19 having a shape elongated along the shuttle shaft 1a meshes with the rotary gear 13. One end of the drive gear 19 is rotatably supported by a portion of the motor fixing plate 21 attached to the base plate 3 that protrudes toward the other end of the transport shaft, and the other end is fixed to the motor fixing plate 21. The rotary shaft 20 is directly connected to the output shaft of the rotary motor 20.

Therefore, when the rotation motor 20 rotates, the transfer block 12 is moved through the drive gear 19 and the rotation gear 13.
A rotating arm 70 composed of the carrier plates 10, 10 and the holding portions 11, 11 is adapted to rotate. In the present embodiment, the rotating operation of the rotating arm 70 is performed when the rotating arm 70 is in the retracted position (see FIGS. 4 to 6). Further, the transport shaft 4 is cantilevered, but since it is guided by the drive gear 19, its supporting strength is sufficient.

A not-illustrated stop ring, for example, is fixed to the outer periphery of the transport block 12 on the fixed end side of the transport shaft 4 with respect to the rotary gear 13, and the rotary gear 13 and the stop on the outer periphery of the transport block 12 are fixed. A linear motion collar 14 is rotatably supported between the ring and the ring.

As shown in FIG. 5, one end of a linear motion link 15 is pivotally attached to the linear motion collar 14. The other end of the linear motion link 15 is pivotally attached to one end of a dogleg-shaped drive link 16, and the bent portion forming the dogleg of the drive link 16 is fixed to the base plate 3. It is pivotally attached to the bracket. The other end of the drive link 16 is
It is pivotally attached to a knuckle 17 of an air cylinder 18 fixed to the base plate 3.

Therefore, when the air cylinder 18 is driven, the rotary arm 70 moves along with the linear movement collar 14 along the axial direction of the transport shaft 4 via the knuckle 17, the drive link 16, and the linear motion link 15. Has become. That is, the rotating arm 70 can rotate with respect to the transport shaft 4 and can slide along the transport shaft 4.

A sensor fixing plate 33 is rotatably attached to the open end side of the carrying shaft 4, and a rotation sensor composed of a light emitting element 31a and a light receiving element 31b is mounted on the sensor fixing plate 33. 31 is attached. Further, as shown in FIGS. 3 and 4, the rotating arm 70 has
The sensor plate 32 is fixed, and when the rotating arm 70 is rotated, the sensor plate 32 causes the light emitting element 31a and the light receiving element 31 to be detected.
The positions of the rotation sensor 31, the sensor fixing plate 33, and the sensor plate 32 are adjusted so that they can pass through the space b.

A dummy shaft 6 as a bobbin case holding means is provided at a position opposite to the rotation locus of the bobbin case gripping means on the base plate 3, for example, at positions D and E, as shown in FIG. Each is fixed. As shown in FIG. 8, the dummy shaft 6 has the same structure as the tip of the shuttle shaft 1a, and the bobbin case 2 containing the bobbin can be pushed in to hold the bobbin case 2. . And the bobbin case 2 that was pushed in
As shown in FIG. 7, the existing bobbin engaging claw 2d of
It is configured to engage with the locking groove of the rotation preventing member 5aa provided in the vicinity of the dummy shaft 6. That is, the bobbin case 2 is positioned and held at a predetermined position.

A residual yarn removing device is provided at a position opposite to the rotation locus of the bobbin case gripping means, for example, at a position C as shown in FIG. This residual thread removing device is in a state where the bobbin case 2 is held by the bobbin case holding means 50 or a state where the bobbin case is transferred to a holding shaft having the same structure as the dummy shaft 6 and the bobbin case is held. Then, as long as the bobbin is rotated by the yarn drawing operation of the drawing means for drawing the yarn wound on the bobbin, the yarn wound on the bobbin may be drawn out, For example, Japanese Patent Application No. 5-203 previously filed by the applicant
Appropriate ones can be adopted, including the bobbin residual yarn removing device described in Japanese Patent Application No. 610 and Japanese Patent Application No. 6-40351.

A bobbin winding device is arranged at a position opposite to the rotation locus of the bobbin case holding means, for example, at a position F, as shown in FIG. As this bobbin winding device, any device can be used as long as the bobbin can be automatically wound around a bobbin by driving a motor or the like, and then the bobbin case 2 can be hooked and the bobbin can be cut. For example, the bobbin exchanging device of Japanese Unexamined Patent Publication No. 5-192476 or the bobbin exchanging device of the sewing machine and Japanese Patent Application No. 5-116363 of Japanese Patent Application No. 5-121960 previously filed by the present applicant. Appropriate ones can be adopted, including the lower thread winding device described in the bobbin changing device of the sewing machine in the specification.

When the residual yarn removing device and the bobbin winding device contact the base plate 3, the base plate 3 is appropriately cut. Further, in FIG. 7, the residual thread removing position C
The bobbin winding device F and the dummy shafts 6 and 6 are close to each other, and the holding portion 11 is exaggerated. Therefore, when the holding unit 11 moves to the shuttle 1 and the dummy shaft 6, there is a concern that the holding unit 11 may come into contact with the residual yarn removing device or the bobbin winding device. However, in practice, such contact should be avoided. Enough space is secured.

By the way, in the present embodiment, the bobbin case holding means 50 can be moved by the air cylinder 18 to the bobbin case attaching / detaching position (hook position) and the retracted position moved to the opposite hook side. Then, the origin position is searched at the retracted position (see FIGS. 4 to 6). Therefore, one of the bobbin case gripping means is moved to the retracted position facing the shuttle 1 and then rotated, so that the sensor plate 32 shields the space between the light emitting element 31a and the light receiving element 31b with respect to the transport shaft 4. When the sensor fixing plate 33 is fixed, when the rotation motor 20 is a pulse motor, for example, by counting the number of pulses of the pulse motor, the bobbin case gripping means 50 is moved to the bobbin position A, the bobbin winding position. The rotation can be controlled to the turning position F, the residual yarn removing position C, and the dummy positions D and E.

A CPU 58 is connected to the micro switch 57 as shown in FIG. This CPU 58 is an ordinary automatic bobbin thread feeder for sending control commands to the error detection means 58a connected to the micro switch 57 and the bobbin thread automatic feeder (bobbin exchanging device, residual yarn removing device, bobbin winding device). The CPU 58 is connected to a ROM (not shown) for storing a program representing an operating procedure and a RAM (not shown) for storing and processing each set value and data table. There is. Further, the error detection means 58a is externally connected to an error notification means 59 such as an alarm buzzer or an error blinking lamp.

The error detecting means 58a is a detection signal from the micro switch 57 (a detection signal which is turned on when the lock lever 2a of the bobbin case 2 is in the open state, and is otherwise turned off when the lock lever 2a is in the closed state). On the basis of the above, the normal bobbin thread automatic feeder control means 58b
While monitoring the control command or control operation of the above, it is possible to detect the gripping failure and the opening failure of the bobbin case gripping means 50.

That is, the error detecting means 58a is used when the bobbin case 2 needs to be gripped.
Does not detect open state of a (off signal is received)
When it is determined that the bobbin case gripping means 50 is not gripped properly and the bobbin case 2 needs to be opened, the open state of the lock lever is detected (an ON signal is received), and the bobbin case gripping means is opened. It is possible to judge these defects and detect these defects.

When these defects are detected, the error detecting means 58a sends an operation stop command to the normal bobbin thread automatic feeder controlling means 58b to stop the apparatus and the error detecting means 58a. The error notification means 59 notifies the operator of these defects so that the operator can intervene.

Next, the operation of the apparatus thus constructed will be described below. First, for example, in order to allow both bobbin case gripping means 50a and 50b (for convenience of description, ab is added after the number to distinguish them) to grip the bobbin case accommodating the bobbin wound with bobbin, Similar to mounting the bobbin case accommodating the bobbin wound with the lower thread by inserting the hand from the rotary arm side to the shuttle shaft 1a,
Push the bobbin cases into the dummy shafts 6 and 6 by pushing them into the dummy shafts 6 and 6 without returning the palms. It is very easy to attach the bobbin case to the dummy shafts 6 and 6 by this manual work.

Next, when the power switch is turned on, the rotary arm 70 is returned to the original position, and when the start switch is turned on, the rotary arm 70 is rotated to move one bobbin case holding means 50a to the dummy position D or. Face E. Then, the rotating arm 70 is moved forward to move the bobbin case containing the bobbin wound on the dummy shaft 6 into the bobbin case holding means 50a.
To hold.

The bobbin case gripping means 50a is gripped by the bobbin case gripping means 50a by advancing the bobbin case gripping means 50a by advancing the rotating arm 70 from the state shown in FIG. 2 (a). In this state, the lever 51 is rotated toward the opening direction by the retracting operation of the plunger 51a of the solenoid 51, whereby the lock lever 2a of the bobbin case 2 is released and the lever claw 55 is opened.
2C, the lock lever 2a is pressed against the base body 53d and is clamped by the base body 53d.

At this time, the contact 5 of the microswitch 57
7a is pressed by the lock lever 2a, and an ON signal is output from the micro switch 57. That is, since the lock lever 2a is in the open state when the bobbin case 2 must be gripped, it is assumed that the bobbin case 2 is normally gripped by the bobbin case gripping means 50a.
The control operation continues.

On the other hand, when the off signal is still output from the micro switch 57, when the bobbin case 2 must be gripped, the lock lever 2a is not in the open state, so the bobbin case 2 grips the bobbin case. Means 5
0a is not normally gripped and a grip failure occurs,
Device operation is stopped. At this time, the error informing unit 59 informs the worker of these defects, and the worker intervenes to properly restore the bobbin case having the poor grip.

When the bobbin case 2 is normally gripped by the bobbin case gripping means 50a, the control operation is continued and the rotating arm 70 is retracted as shown in FIG. 2 (d). Next, the rotating arm 70 is rotated so that one of the bobbin case gripping means 50a holding the bobbin case faces the shuttle 1 and is moved forward, and the bobbin case containing the bobbin wound bobbin is mounted in the shuttle. To do.

The bobbin case holding means 50a mounts the bobbin case by reversing the operation procedure shown in FIG. That is, when the bobbin case 2 is inserted into the shuttle 1, the energization of the solenoid 51 is released, the lever claw 55 of the bobbin case gripping means 50a is opened, and the torsion coil spring 56 urges it.
As a result, the bobbin case 2 is mounted in the shuttle 1.

At this time, the contact 5 of the microswitch 57
7a is released from the pressing by the lock lever 2a, and the micro switch 57 outputs an off signal. That is, when the bobbin case 2 has to be opened, the lock lever 2a is not in the open state (closed state), so that the bobbin case 2 is normally released from the bobbin case gripping means 50a, and the control operation is performed. Continued.

On the other hand, when the ON signal is still output from the micro switch 57, when the bobbin case 2 has to be opened, the lock lever 2a is in the open state, so that the bobbin case 2 grips the bobbin case. Means 5
0a is not normally released, and the operation of the device is stopped because an opening failure has occurred. At this time, the error notification means 5
The operator is informed of these defects by means of 9, and the operator intervenes so that the bobbin case that has become defective in opening is restored normally.

Now, when the bobbin case 2 is normally released from the bobbin case holding means 50a, the control operation is continued and the rotating arm 70 is retracted.

Next, when the sewing is started, one of the bobbin case gripping means (for convenience of explanation, the bobbin case gripping means 5 is operated by the same operation as described above during the sewing.
0b), the bobbin case accommodating the bobbin wound with the bobbin thread held on the dummy shaft 6 is gripped, and the rotating arm 70 is retracted.

If, for example, a bobbin replacement command is issued because the bobbin in the hook has run out of yarn, etc.,
The sewing operation of the sewing machine is prohibited, the rotating arm 70 is rotated, the bobbin case holding means 50a not holding the bobbin case is made to face the hook 1 and is moved forward, and the bobbin with less residual thread is moved inside the hook. Take out from.

At this time, it is judged whether or not the bobbin case holding means has the same gripping failure as described above. If there is a problem, the operation of the device is stopped and the error notifying means 59 is operated, as in the above case. On the other hand, if there is no problem, the rotating arm 70 is retracted.

Then, the rotating arm 70 is rotated so that the bobbin case containing the bobbin wound bobbin faces the hook 1 and is moved forward, and the bobbin case containing the bobbin wound bobbin is placed in the hook. Installing.

At this time, it is determined whether or not the bobbin case holding means is defectively opened, similar to the above. If there is a problem, the operation of the device is stopped and the error notifying means 59 is operated, as in the above case. On the other hand, if there is no problem, the rotating arm 70 is retracted.

When the sewing is started, the rotating arm 70 is rotated during the sewing so that the bobbin with less residual thread faces the residual thread removing device, and the bobbin case is removed by the residual thread removing device. The residual thread of the bobbin contained in the bobbin is removed, and the bobbin is used as an empty bobbin with no thread.

Then, the rotating arm 70 is rotated so that the empty bobbin faces the bobbin winding device, and the rotating arm 7 is rotated.
0 is advanced, the lower thread is wound around the empty bobbin by the lower thread winding device, and the thread is hooked on the bobbin case and the lower thread is cut.

In this way, when the bobbin is wound around the bobbin, the rotary arm 70 is retracted to the standby state, and when the next bobbin replacement command is issued, the sewing operation of the sewing machine is prohibited, The rotating arm 70 is rotated so that the bobbin case gripping means 50b not gripping the bobbin case faces the shuttle 1 and is moved forward to take out the bobbin with less residual thread from the shuttle.

At this time, it is determined whether or not the bobbin case holding means has the same gripping failure as described above. If there is a problem, the operation of the device is stopped and the error notifying means 59 is operated, as in the above case. On the other hand, if there is no problem, the rotating arm 70 is retracted.

Next, the rotating arm 70 is rotated and moved forward, and the bobbin on which the lower thread is wound by the lower thread winding device is mounted in the shuttle.

At this time, it is determined whether the bobbin case holding means is defectively opened as in the above case. If there is a problem, the operation of the device is stopped and the error notifying means 59 is operated, as in the above case. On the other hand, if there is no problem, the rotating arm 70 is retracted. After that, the above operation is repeated.

By the way, there is a case where the bobbin case 2 held by the bobbin case holding means 50 is taken out or the bobbin case 2 is temporarily held on the dummy shaft 6 in order to use a lower thread of a different color. The bobbin case gripping means 50 gripping the bobbin case 2 faces the dummy shaft 6 and is moved forward to transfer the bobbin case 2 gripped by the bobbin case gripping means 50 to the dummy shaft 6. You can

At this time as well, the open failure of the bobbin case holding means is determined in the same manner as described above. If there is a problem, the operation of the device is stopped and the error notifying means 59 is operated, as in the above case.

When the bobbin case 2 held by the dummy shaft 6 is to be taken out, the hand is inserted from the rotating arm side in the same manner as when the bobbin case 2 is taken out from the shuttle shaft 1a without turning the palm. The bobbin case held by the dummy shaft 6 can be taken out. It is very easy to take out the bobbin case from the dummy shafts 6 and 6 by this manual work.

As described above, in this embodiment, the open state of the lock lever 2a of the bobbin case 2 is detected by the micro switch 57, and the error detection means 58a detects the open signal based on the detection signal from the micro switch 57. When it is necessary to grip the bobbin case 2, the lock lever 2
If the open state of a is not detected, it is determined that the bobbin case grasping means 50 is not properly gripped, and if the open state of the lock lever 2a is detected when the bobbin case 2 needs to be opened, it is determined that the bobbin case grasping means 50 is not properly opened. When these defects are detected, the apparatus is stopped, and at the same time, the error is notified to the worker by the error notification means 59 so that the worker can intervene. Therefore, the reliability of the device can be improved.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above-described embodiment, both the gripping failure and the opening failure of the bobbin case gripping means 50 are detected based on the detection signal from the micro switch 57. You may make it detect only one.

Further, in the above embodiment, the detection means for detecting the open state of the lock lever 2a is a micro switch, but the detection means is not limited to a micro switch, and it may be replaced by, for example, a photo sensor or the like. .

In the above embodiment, when the bobbin case 2 is attached / detached to / from the shuttle 1 and the dummy shaft 6, the bobbin case gripping means 50 detects a gripping failure / opening failure. If a holding shaft for holding the bobbin case is provided in the residual thread removing device and the bobbin winding device, and the holding shaft is configured in the same manner as the dummy shaft 6, the bobbin case can be provided for the residual thread removing device and the bobbin winding device. Even when the bobbin case gripping means 50 is attached or detached, it is possible to detect the gripping failure and the opening failure.

Further, as shown in FIG. 9, for example, a dummy shaft 6 as a bobbin case holding means is provided with a holder 80a capable of accommodating the bobbin case 2 and a holder 80a when the bobbin case 2 is accommodated in the holder 80a. The bobbin case holding means 80 may be replaced with a rotation stopping member 80b that prevents the bobbin case 2 from rotating and a magnet 80c that magnetically attracts the bobbin case 2 provided on the back surface of the holder 80a. With this configuration, the open end side of the existing notch 2a of the bobbin case 2 engages with the rotation stopping member 80b, and the bobbin case 2 containing the bobbin can be held. Similarly, when the bobbin case 2 is attached / detached to / from the bobbin case holding means 80, it is possible to detect a gripping failure / opening failure of the bobbin case gripping means 50.

Not only when the bobbin case gripping means 50 is rotated, when the bobbin case gripping means 50 is rotated, when the bobbin case gripping means 50 is moved forward or backward, or when the bobbin case is dropped off, etc., based on the detection signal from the detecting means. Poor gripping may also be detected.

Further, the dummy positions D and E, the bobbin thread winding position F, and the residual yarn removing position C are not limited to the positions in the above embodiment, and in short, these positions are the bobbin case gripping means 5.
It suffices if it is at the opposite position of the moving trajectory of 0.

[0064]

As described above, according to the bobbin exchanging device of the first aspect, the detection means detects the open state of the lock lever of the bobbin case, and the error is detected based on the detection signal from the detection means. If the detection means does not detect the open state of the lock lever when the bobbin case needs to be gripped, it is determined that the bobbin case gripping means is not properly gripped, and the open state of the lock lever is detected when the bobbin case needs to be opened. When it is determined that the bobbin case gripping means has an open defect, at least one of these defects is detected, and when these defects are detected, the apparatus is stopped, for example, and the operator is notified of these defects by, for example, error notification means, Since it is configured to allow the intervention, it is possible to prevent the occurrence of a malfunction thereafter and improve the reliability of the device.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a bobbin case gripping means, a detecting means, and an error detecting means of a bobbin changing device in an embodiment of the present invention.

FIG. 2 is an operation explanatory view showing a gripping / releasing operation of a bobbin case gripping means.

FIG. 3 is a front view of the above bobbin changing device.

FIG. 4 is a plan view of the above bobbin changing device.

FIG. 5 is a left side view of the above bobbin changing device.

FIG. 6 is a right side view of the above bobbin changing device.

FIG. 7 is a schematic front view for explaining a dummy position and a dummy shaft of the bobbin changing device of the above.

FIG. 8 is a schematic side view for explaining a dummy position and a dummy shaft of the same bobbin changing device.

FIG. 9 is a perspective view showing another example of the bobbin case holding means.

[Explanation of symbols]

 1, 6, 80 Facing member 2 Bobbin case 2a Lock lever 50 Bobbin case gripping means 57 Detecting means 58a Error detecting means

Claims (1)

[Claims] 1. A bobbin case accommodating a bobbin inside thereof can be gripped by raising the lock lever to an open position, and by returning the lock lever to a closed position, the bobbin case can be opened. In a bobbin exchanging device having a bobbin case gripping means for moving along the path, and the bobbin case accommodating the bobbin inside is detachable from a member facing the bobbin case gripping means. A bobbin exchanging device comprising: a detecting means for detecting; and an error detecting means for detecting at least one of a poor holding and a poor opening of the bobbin case holding means based on a detection signal from the detecting means.