JP7411275B1 - Error detection device for bobbin case changing device - Google Patents

Abstract

[Problem] To not only detect multiple types of errors that occur in a bobbin case changing device, but also to communicate which error has occurred to the sewing machine user so that he or she can understand the error without having to check the bobbin case changing device. To make it possible to efficiently take measures to eliminate problems. SOLUTION: An error detection device 40 of a bobbin case exchange device detects a dog 41 in which a plurality of detected parts are provided at rotational positions according to the type of error, and a detected part reached by rotation of the dog 41. A sensor 51, a control device 70 that identifies and outputs the type of error based on the difference in arrival timing of the detected part detected by the sensor 51, and a transmission device 80 that transmits the type of error output by the control device to the sewing machine user. It consists of: [Selection diagram] Figure 7

Description

The present invention relates to an error detection device for a bobbin case changing device for a sewing machine.

The bobbin case exchange device removes a bobbin case containing a bobbin that has run out or is about to run out of bobbin thread (hereinafter referred to as the "empty bobbin case") from the hook of the sewing machine, and replaces it with a bobbin that is fully wound with bobbin thread. The bobbin case (hereinafter referred to as the "refill bobbin case") containing the bobbin is attached to the hook.

The present applicant previously disclosed in Patent Document 1 a replenishment bobbin case receiver for setting a replenishment bobbin case, a fixed base, a rotating base that can rotate relative to the fixed base, and a device for grasping an empty bobbin case or a replenishment bobbin case. A claw device that has a claw that can be opened and closed, a rotating mechanism that allows the rotating base to pivot between the direction facing the refill bobbin case receiver and the direction facing the hook, and a rotating mechanism that allows the claw device to slide back and forth with respect to the rotating base. A bobbin case changing device is disclosed that includes a front and back sliding mechanism that opens and closes the claw, a claw opening and closing mechanism that allows the claw to open and close, and one drive shaft that drives all of these turning mechanisms, the front and back sliding mechanism, and the claw opening and closing mechanism. . This bobbin case exchange device has the excellent effect of reducing the failure rate by using only one drive shaft, reducing downtime due to repairs, and increasing the operating rate of the sewing machine.

In addition, this bobbin case exchange device has the following problems: (a) an error in forgetting to insert a refill bobbin case into the refill bobbin case receiver, (b) an error in removing an empty bobbin case from the hook, and (c) an error in removing a refill bobbin case from the refill bobbin case receiver. An error detection device is provided that detects a case removal error with a single sensor. This error detection device consists of a disk-shaped dog that rotates in synchronization with a drive shaft and a turning cam, and has a plurality of open slits formed at rotational positions corresponding to the errors (a) to (c) above, and a claw. A bar-shaped dog with an opening slit that slides back and forth with the device, and an open slit that is installed near the disc-shaped dog and where the disc-shaped dog and the bar-shaped dog are lined up and that is reached by rotating the plate-shaped dog. A device equipped with a sensor arranged to detect the This error detection device has the excellent effect of reducing the failure rate, reducing downtime due to repairs, and increasing the operating rate of the sewing machine by using only one sensor for error detection.

Patent No. 6945206

However, the above-mentioned error detection device only stops the bobbin case exchange device when it detects any of the errors (a) to (c) above. Therefore, there is a problem in that the sewing machine user cannot tell which error has occurred unless he or she goes to the sewing machine head and checks the bobbin case changing device.

Further, due to this problem, there was also the problem that it was not possible to efficiently take measures to eliminate the error. That is, the measures to eliminate the errors (a) to (c) above are different as follows.
(a) In the event of an error in forgetting to insert the refill bobbin case, it is necessary to set the bobbin case with the bobbin thread wound on the refill bobbin case receiver.
(b) When an empty bobbin case removal error occurs, it is necessary to take out the empty bobbin case from the hook.
(c) When there is an error in taking out the replenishment bobbin case, it is necessary to confirm the cause of the error and take measures such as correctly setting the replenishment bobbin case in the replenishment bobbin case receiver.

In (a) above, it is necessary for the sewing machine user to prepare and carry a refill bobbin case, but in (b) and (c) above, this is not necessary. If you can't figure out these things until you inspect the bobbin case exchange device, it will be inefficient when dealing with the problem.

Therefore, an object of the present invention is to not only detect multiple types of errors that occur in the bobbin case changing device, but also to communicate which error has occurred to the sewing machine user without having to check the bobbin case changing device. The purpose is to make it easy to understand and take measures to eliminate errors efficiently.

The present invention is an error detection device for detecting multiple types of errors in a bobbin case changing device of a sewing machine, comprising:
A dog that rotates in synchronization with the drive shaft of the bobbin case exchange device and has a plurality of detected parts at rotational positions depending on the type of error;
a sensor that is installed near the dog and detects the detected part that is reached by the rotation of the dog;
A control device that identifies and outputs the type of error based on the difference in arrival timing of the detected part detected by the sensor;
The sewing machine is characterized in that it includes a transmission device that transmits the type of error outputted by the control device to the sewing machine user.

The multiple types of errors include, but are not limited to, an error in forgetting to insert a refill bobbin case into the refill bobbin case receiver, an error in taking out an empty bobbin case from the hook, and an error in taking out a refill bobbin case from the refill bobbin case receiver. can be exemplified.

The detected part and the sensor are not particularly limited, but an example may be an embodiment in which the detected part is an open slit and the sensor is a photosensor that detects light passing through the open slit. The shape of the main body of the dog other than the detected portion is not particularly limited, and examples thereof include a disk shape, a square plate shape, and a cylindrical shape.

The control device includes, but is not particularly limited to, a pulse generator that generates pulses, a motor driver that operates a drive motor for rotating the drive shaft based on the pulses, a pulse counter that counts the pulses, and a pulse generator that operates the drive motor for rotating the drive shaft based on the pulses. An example may include a determination section based on a count number and a photosensor signal. In this aspect, the following two examples are illustrated.
(1) An example in which a CPU (Central Processing Unit) is responsible for the pulse generation section, pulse count section, and determination section. The CPU may be an MCU (Micro Controller Unit) or an MPU (Micro Processor Unit).
(2) The pulse generating section is carried out by a circuit that generates a clock signal and a circuit that outputs pulses based on the clock signal, and the pulse counting section is carried out by a counter circuit that counts pulses by counting the clock signal, In this example, the judgment section is handled by a judgment circuit.

The transmission device is not particularly limited, but the following three examples will be exemplified.
(a) A light emitting device that emits a color depending on the type of error.
(b) A display device that displays characters or figures depending on the type of error.
(c) Pronunciation device that produces a sound or voice depending on the type of error.

Preferably, the error detection device also detects the origin of the drive shaft.

In order to distinguish between error detection and origin detection, the detected part for error detection is an open slit with a relatively narrow slit width, and the detected part for origin detection is an open slit with a relatively wide slit width. Preferably, the sensor detects the difference in width between both slits.
is preferable.

According to the present invention, it is possible to not only detect multiple types of errors that occur in the bobbin case changing device, but also to notify the sewing machine user of which error has occurred so that the user can know which error has occurred without inspecting the bobbin case changing device. This makes it possible to efficiently take measures to resolve errors.

FIG. 1 is a perspective view of a bobbin case changing device according to an embodiment. FIG. 2 is an exploded perspective view of the device. FIG. 3 is a perspective view of the swivel base, front-rear slide mechanism, error detection device, etc. of the device. FIG. 4 is an exploded perspective view of the three cams, etc. of the same device. FIG. 5 is an exploded perspective view of the claw device, etc. of the same device. FIG. 6 is a side view of a disk-shaped dog and a bar-shaped dog of the same error detection device. FIG. 7 is a block diagram of the same error detection device. FIG. 8 is a timing chart of the bobbin case changing device. FIG. 9 shows the detection of an error of forgetting to insert a refill bobbin case in the same device. (a) is a side view in a normal state, and (b) is a side view in an error state. FIG. 10 shows the detection of an error in taking out an empty bobbin case by the same device. (a) is a side view in a normal state, and (b) is a side view in an error state. FIG. 11 shows the detection of an error in taking out a replenishing bobbin case by the same device. (a) is a side view in a normal state, and (b) is a side view in an error state. FIG. 12 is a flowchart of error detection by the error detection device. FIG. 13 is a timing chart of error detection by the error detection device.

An error detection device that detects multiple types of errors in a bobbin case changing device of a sewing machine,
A dog that rotates in synchronization with the drive shaft of the bobbin case exchange device and has a plurality of detected parts at rotational positions depending on the type of error;
a sensor that is installed near the dog and detects the detected part that is reached by the rotation of the dog;
A control device that identifies and outputs the type of error based on the difference in arrival timing of the detected part detected by the sensor;
The sewing machine includes a transmission device that transmits the type of error output by the control device to the sewing machine user.
The type of sewing machine is not particularly limited, and examples include a straight stitch sewing machine, a pattern stitch sewing machine, an embroidery sewing machine, and the like.

Next, embodiments of the present invention will be described with reference to FIGS. 1 to 13. The structures, materials, shapes, and dimensions of each part in the embodiments are merely examples, and can be changed as appropriate without departing from the spirit of the invention.

The sewing machine 60 includes a sewing machine head (not shown) and a bed 61 below the sewing machine head. The bed 61 is mounted on a machine frame 62, and a drive shaft 63 is passed through the bed 61. The bed includes a hook 64 driven by a drive shaft 63 and a needle plate 65 covering the hook.

The bobbin case exchange device 1 is provided in front of the hook 64. In the following, when viewed from the bobbin case changing device 1, the side of the hook 64 is referred to as "front", moving toward the hook 64 is referred to as "forward", and the opposite side is referred to as "rear", meaning moving away from the hook 64 in the opposite direction. is called a "regression."

As shown in FIGS. 1 to 7, the bobbin case changing device 1 includes:
a refill bobbin case receiver 2 for setting the refill bobbin case B;
fixed base 3,
a rotating base 4 that can rotate relative to the fixed base 3;
a claw device 6 having an openable/closable claw 10 for grasping an empty bobbin case A or a refill bobbin case B;
a turning mechanism 17 that allows the turning base 4 to turn between a direction facing the replenishment bobbin case receiver 2 and a direction facing the hook 64;
a front-rear slide mechanism 22 that allows the claw device 6 to slide back and forth with respect to the rotation base 4;
a claw opening/closing mechanism 34 that allows the claw 10 to be opened and closed;
One drive shaft 16 that drives all of the rotation mechanism 17, the front-rear slide mechanism 22, and the claw opening/closing mechanism 34;
one drive motor 14 that rotates a drive shaft 16;
A single sensor detects an error in forgetting to insert a refill bobbin case into the refill bobbin case receiver 2, an error in taking out an empty bobbin case from the hook 64, an error in taking out a refill bobbin case from the refill bobbin case receiver 2, and the origin of the drive shaft 16. The system includes an error detection device 40 for detecting errors.

[Replenishment bobbin case receiver 2]
The replenishment bobbin case receiver 2 is formed by forming a recess into which the replenishment bobbin case B is set in a receiving plate whose rear surface faces diagonally upward and backward by tilting diagonally forward. The replenishment bobbin case receiver 2 is attached to the machine frame directly below the hook 64 via a bracket.

[Fixed base 3]
The fixed base 3 is a plate-shaped body extending in the longitudinal direction and the front-rear direction, and is fixed to the side of the replenishment bobbin case receiver 2. An escape hole is formed in the base to release the rotation of the motor, which will be described later.

[Swivel base 4]
The swing base 4 is a plate-shaped body extending in the longitudinal direction and the front-rear direction, and the upper part thereof is pivotally attached to the upper part of the fixed base 3 by a swing support shaft 5. The front part can be rotated.

[Claw device 6]
The claw device 6 is rotated by a slide base 7, a presser plate 9 attached to the slide base 7 via a pin receiver 8, and a fulcrum shaft 11 that engages with the pin receiver 8 on the presser plate 9. It consists of a movably attached claw 10, a claw receiver 12 fixed on a lower presser plate 9, and a presser upper plate 13 that covers the claw 10 and the claw receiver 12.
The slide base 7, the lower plate 9, the claw 10, the claw receiver 12, and the upper plate 13 can all slide back and forth together with the rear slide block 28, which will be described later.
When the pawl 10 is rotated toward the pawl receiver 12, the pawl 10 grips the bobbin case knob with the pawl receiver 12, and when it is rotated away from the pawl receiver 12, it grips the bobbin case knobs A and B. Release it and it becomes "open".

[Drive motor 14]
The drive motor 14 is attached laterally to the rear of the swing base 4. The motor body 15 is located on the left side of the swing base 4 and passes through a relief hole in the fixed base 3, and a drive shaft 16 rotated by the motor body 15 projects on the right side of the swing base 4. A DC motor with a speed reducer is used as the drive motor 14, and the rotation time required for one rotation of the motor (output shaft) is 5 seconds.

[Swiveling mechanism 17]
The turning mechanism 17 includes a turning cam 18 attached to the drive shaft 16 and rotating together, and a cam follower 19 attached to the fixed base 3 via a base 20 and a turning phase adjusting plate 21.
The turning cam 18 is a plate cam having a cam edge with a specific cam profile, and each phase of the cam edge pushes the cam follower 19 as it rotates, so that the turning base 4 turns together with the turning cam 18. There is. Further, by adjusting the position of the rotation phase adjustment plate 21 with respect to the base 20 and stopping it, the rotation phase can be adjusted. Note that a spring mechanism (not shown) is provided that biases the turning mechanism 17 in the direction of bringing the cam follower 19 into contact with the turning cam 18.
The turning angle of the turning base 4 by the turning cam 18 etc. (the angle between the direction facing the replenishment bobbin case receiver 2 and the direction facing the hook 64) is, for example, 20 to 40 degrees (30 degrees in the illustrated example), and the mechanism It is easy to incorporate and the turning time can be shortened.

[Anteroposterior slide mechanism 22]
The longitudinal slide mechanism 22 includes a longitudinal slide cam 23 that rotates in synchronization with the drive shaft 16 and the turning cam 18, a four-bar link 25 with a cam follower 24, and a front-rear slide mechanism that is attached to one lever of the four-bar link 25. The slide lever 26, the front-rear slide shaft 27 attached to the turning base 4, the rear slide block 28 and front slide block 29 that are slidably engaged with the front-rear slide shaft 27, and the space between the slide blocks 28, 29. The structure includes a spring 31 interposed in a gap 30 with a longitudinal length of about 8 mm, and a lever drive pin 32 that protrudes from the rear slide block 28 and engages with the longitudinal slide lever 26. A slide base 7 of the claw device 6 is attached.

The longitudinal sliding cam 23 rotates in synchronization with the turning cam 18 because a plurality of connecting screws 33, which are also inserted into the holes of the turning cam 18, are inserted into its holes. The longitudinal sliding cam 23 is a plate cam having a cam edge with a specific cam profile, and as it rotates, each phase of the cam edge pushes the cam follower 24, causing the four-bar link 25 to swing in the longitudinal direction. Along with this rocking, the front and rear slide lever 26 swings and pushes the lever drive pin 32, so that the rear slide block 28 pushes the front slide block 29 via the spring 31, so that the rear slide block 28 and the front slide The block 29 slides by the same amount, and the claw device 6 attached to the front slide block 29 at the slide base 7 slides back and forth. Note that a spring mechanism (not shown) is provided that biases the longitudinal sliding mechanism 22 in a direction that brings the cam follower 24 into contact with the longitudinal sliding cam 23.

Specifically, when the back and forth sliding amount of the rear slide block 28 and the front slide block 29 reaches 44 mm, the lower presser plate 9 and the upper presser plate 13 press the bobbin cases A and B as described later, so that the front slide The block 29 (and the slide base 7 and bar-shaped dog 46 attached to it) will no longer slide. Thereafter, only the rear slide block 28 slides 2 mm while compressing the spring 31 to reach a stroke of 46 mm, and the gap 30 is reduced from 8 mm to 6 mm.

However, if there are no bobbin cases A and B to press, when the back and forth sliding amount of the rear slide block 28 and front slide block 29 reaches 44 mm, the presser lower plate 9 and the presser upper plate 13 will be pressed against the bobbin case. Since A and B are not held down, the front slide block 29 can further slide. Thereafter, the rear slide block 28 slides 2 mm together with the front slide block 29 (and the slide base 7 and bar-shaped dog 46 attached thereto) to reach a stroke of 46 mm.

[Claw opening/closing mechanism 34]
The pawl opening/closing mechanism 34 includes a pawl opening/closing cam 35 that rotates in synchronization with the drive shaft 16 and the turning cam 18, a pawl opening/closing lever 37 with a cam follower 36, a four-bar link 38, and a fulcrum shaft 11 of the pawl 10. It extends downward from the rear side, passes through a slit in the hold down plate 9, and abuts on the side edge of the four-bar link 38.

The pawl opening/closing cam 35 rotates in synchronization with the pivoting cam 18 because a plurality of connecting screws 33, which are also inserted into the holes of the pivoting cam 18, are inserted into its holes. The pawl opening/closing cam 35 is a plate cam with a cam edge having a specific cam profile, and as it rotates, each phase of the cam edge pushes the cam follower 36 to swing the pawl opening/closing lever 37 in the front and back direction. swings the four-bar link 38 in the front-rear direction via the engagement pin, displaces the side edge of the four-bar link 38 in the lateral direction, and the side edge pushes the claw drive pin 39, causing the claw 10 to rotate. It moves to open and close. Note that a spring mechanism (not shown) is provided that biases the claw opening/closing mechanism 34 in the direction of bringing the cam follower 36 into contact with the claw opening/closing cam 35.

[Error detection device 40]
The error detection device 40 rotates in synchronization with the drive shaft 16 and the turning cam 18, and is attached to the slide base 7 and a disc-shaped dog 41 provided with a plurality of opening slits at rotational positions depending on the type of error. a bar-shaped dog 46 that slides back and forth together, and one photo that is attached to the sensor base 50 and is provided near the disc-shaped dog 41 to detect an open slit that is reached by the rotation of the disc-shaped dog 41. The sensor 51 is configured to include a sensor 51. (Furthermore, the new system includes a control device 70 and a transmission device 80, which will be described later.)

The disk-shaped dog 41 rotates in synchronization with the drive shaft 16 and the turning cam 18 because a plurality of connecting screws 33, which are also inserted into the turning cam 18, are inserted into the holes thereof. The disc-shaped dog 41 is a disc in which an open slit that matches the cam angle and phase is formed, and as shown in FIG. 6 in detail,
・A disc-side origin detection slit 42 aligned with the 0° phase (origin) of the drive shaft 16;
・A slit 43 for forgetting the refill bobbin case on the disc side, which matches the phase of 160°,
- A slit 44 for the empty bobbin case on the disc side, which is aligned with the phase of 270°,
- A slit 45 for the disk side replenishment bobbin case is formed to match the phase of 290°. The slit width of the disk-side origin detection slit 42 is 7.5 degrees in rotation angle. The slit width of the open slits 43, 44, and 45 for error detection is 2.5 degrees in rotation angle.

The bar-shaped dog 46 is a band plate extending in the front-rear direction and having an open slit that is in phase with the cam angle.
・Bar side origin detection slit 47,
- A slit 48 for the bar side empty bobbin case is formed.

The disc-shaped dog 41 and the bar-shaped dog 46 are arranged close to each other in the lateral direction in such a positional relationship that their slits can overlap.

The sensor base 50 is attached to the upper part of the rotating base 4 so as to be located at the information of the disc-shaped dog 41 and the bar-shaped dog 46.
One photosensor 51 consists of a light emitter and a light receiver attached to a sensor base 50, and detects when the open slit of the disc-shaped dog 41 and the open slit of the bar-shaped dog 46 match (pass through the open slit). Errors in forgetting to insert a refill bobbin case into the refill bobbin case receiver 2, errors in taking out an empty bobbin case from the hook 64, and errors in taking out a refill bobbin case from the refill bobbin case receiver 2 are detected. , and the origin of the drive shaft 16. The details will be described later.

The mechanical configuration of the bobbin case exchange device 1 that has been described so far is basically the same as the configuration of the bobbin case exchange device disclosed in Patent Document 1 (the slight difference in the phase angle of the open slits 43 to 45 is ), in this embodiment, the error detection device 40 further includes a control device 70 that identifies and outputs the type of error based on the difference in arrival timing of the open slit detected by the photosensor 51; This differs from the error detection device of Patent Document 1 in that it includes a transmission device 80 that transmits the type of error to the sewing machine user.

As shown in FIG. 7, the control device 70 includes a start switch 71 for the drive motor 14, a pulse generator that generates pulses, a motor driver 72 that operates the drive motor 14 based on the pulses, and a controller that counts the pulses. The present invention includes a pulse counting section for determining the number of pulses and a determining section based on the pulse count number and a photosensor signal, and the following two examples will be exemplified.
(1) As shown in FIG. 7(a), the MCU 73 is responsible for the pulse generation section, pulse counting section, and determination section.
(2) As shown in FIG. 7(b), the pulse generation section includes a clock signal generation circuit 74 that generates a clock signal and a pulse output circuit 75 that outputs pulses based on the clock signal, and a pulse count section is an example in which a counter circuit 76 that counts pulses by counting the clock signal is responsible, and a determination circuit 77 is responsible for the determination section.

The frequency of the pulses generated by the pulse generator is 2,000Hz (=pls/sec), and as mentioned above, the time required for one revolution of the motor (output shaft) is 5 seconds, so the number of pulses for one revolution is 10. ,000pls.

The transmission device 80 is a light emitting device that uses full-color LEDs to emit light in four colors (for example, yellow, red, green, and blue) or three colors (for example, yellow, red, and blue).

The configuration of the control device 70 will be further detailed after explaining the following [basic operation] and [error detection and origin detection].

[basic action]
The basic operation of the bobbin case changing device 1 of this embodiment configured as described above will be explained with reference to the timing chart of FIG. 8. Note that since the mechanical configuration is the same as that of Patent Document 1 mentioned above, the drawings of the basic operation are basically the same as FIGS. 8 to 21 of Patent Document 1, and therefore will be omitted.

(1) When the phase of the drive shaft 16 is 0° (origin), the claw device 6 and the rotating base 4 are at an intermediate position between the direction facing the replenishment bobbin case receiver 2 and the direction facing the hook 64. At this time, there is an empty bobbin case A in the hook 64, and a refill bobbin case B is set in the refill bobbin case receiver 2.
When the drive shaft 16 begins to rotate in one direction, the pawl device 6 begins to rotate together with the rotating base 4 in the direction facing the hook 64, and the pawl device 6 begins to move forward, as shown in the timing chart.

(2) When the drive shaft 16 rotates and the phase is 30°, the claw device 6 is in the direction of facing the hook 64 together with the rotating base 4, and the claw device 6 has moved forward to just in front of the empty bobbin A. At this time, the claw 10 starts to close from the "open" position.

(3) When the drive shaft 16 rotates and the phase is 35°, the claw device 6 has finished moving forward, the front ends of the lower presser plate 9 and the upper presser plate 13 press the empty bobbin case A, and the claw 10 is in the "open" position. The bobbin case A has been rotated a little toward the "close" position, but the knob of the empty bobbin case A has not been grasped yet. The reason why the empty bobbin case A is held down before grasping the knob is to prevent the entire empty bobbin case A from moving and tilting when the knob is grasped (stabilization of the empty bobbin case A).

(4) When the drive shaft 16 rotates and the phase is 60°, the claw 10 is "closed" and grips the knob of the empty bobbin case A, and the claw device 6 begins to retreat. Thereafter, the claw device 6 begins to pivot together with the pivot base 4 in the direction facing the replenishment bobbin case receiver 2.

(5) When the drive shaft 16 rotates and the phase is 105°, the claw device 6 is at an intermediate position together with the rotation base 4 between the direction facing the replenishment bobbin case receiver 2 and the direction facing the hook 64, and the claw device 6 has finished retreating. Thereafter, the claw 10 starts to open from the "closed" position, and the empty bobbin case A is dropped by releasing the claw.

(6) When the drive shaft 16 rotates and the phase is 130°, the claw device 6, together with the rotation base 4, faces the replenishment bobbin case receiver 2, and the claw device 6 moves forward (from 125° to be exact). Start.

(7) When the drive shaft 16 rotates and the phase is 145°, the claw device 6 has moved forward to just in front of the replenishment bobbin case B.

(8) When the drive shaft 16 rotates and the phase is 155°, the claw device 6 has finished moving forward, the front ends of the lower presser plate 9 and the upper presser plate 13 press the refill bobbin case B, and the claw 10 is in the "open" position. The bobbin case B is rotated a little towards the "close" position, but the knob of the refill bobbin case B has not been grasped yet. The reason why the replenishment bobbin case B is held down before grasping the knob is to prevent the entire replenishment bobbin case B from moving and tilting when the knob is grasped (stabilization of the replenishment bobbin case B).

(9) When the drive shaft 16 rotates and the phase is 180°, the claw 10 is "closed" and grips the knob of the replenishment bobbin case B, and the claw device 6 begins to retreat. Thereafter, the pawl device 6 begins to rotate together with the rotating base 4 in the direction facing the hook 64.

(10) When the drive shaft 16 rotates and the phase is 210°, the claw device 6 finishes retracting (from 205° to be exact), and the claw device 6 moves together with the rotating base 4 to the side facing the hook 64. Start turning.

(11) When the drive shaft 16 rotates and the phase is 260°, the claw device 6 is in a direction facing the hook 64 together with the rotating base 4, and the claw device 6 has moved forward to just in front of the hook 64.

(12) When the drive shaft 16 rotates and the phase is 280°, the claw device 6 has finished moving forward and has engaged the replenishment bobbin case B in the hook 64, and the claw 10 begins to rotate from the "closed" position. .

(13) When the drive shaft 16 rotates and the phase is 310°, the claw is "open" and the replenishment bobbin case B has been attached to the hook 64, and the claw device 6 is attached to the replenishment bobbin case receiver together with the rotating base 4. 2, and the claw device 6 begins to move backward (from 305° to be exact).

(14) When the drive shaft 16 rotates and the phase is 340°, the claw device 6 is at an intermediate position together with the rotation base 4 between the direction facing the replenishment bobbin case receiver 2 and the direction facing the hook 64, and the claw device 6 Finish retreating. Thereafter, the drive shaft 16 rotates to a phase of 0° (origin).

As described above, bobbin case replacement is completed with one rotation of the drive shaft 16 in one direction. The next bobbin case exchange is similarly performed by one rotation of the drive shaft 16 in one direction.

[Error detection and origin detection]
Next, in the bobbin case changing device 1 of this embodiment, the three types of error detection that should be detected because they cause operational problems and the origin detection of the drive shaft 16 will be explained using the timing chart of FIG. 8 and the timing chart of FIGS. This will be explained with reference to the operation diagram No. 11.

(A) Error detection of forgetting to insert the refill bobbin case Trying to take it out from case holder 2.

FIG. 4A shows a normal state, that is, a case where the replenishment bobbin case B is set in the replenishment bobbin case receiver 2. As explained in [Anteroposterior sliding mechanism 22] and [Basic operation] (8) above, when the longitudinal sliding amount of the rear slide block 28 and the front slide block 29 reaches 44 mm, the presser lower plate 9 and the presser upper plate 13 (not shown in the figure) presses the replenishment bobbin case B, the front slide block 29 and the bar-shaped dog 46 no longer slide, and then only the rear slide block 28 presses the spring 31 in the gap 30 (see FIG. 3). ) was slid by 2 mm while compressing the gap 30, and the gap 30 was reduced from 8 mm to 6 mm. At this time, the disc-side refill bobbin case forgetting slit 43 passes over the photosensor 51, but since the rear end of the bar-shaped dog 46 closes the slit 43, the photosensor 51 does not detect an error.
Note that the distance from the front end of the front slide block 29 to the photosensor 51 is 103 mm.

FIG. 2B shows an error, that is, a case where the replenishment bobbin case B has been forgotten to be set in the replenishment bobbin case receiver 2. As explained in the above [front/rear slide mechanism 22], the lower presser plate 9 and the upper presser plate 13 do not press the refill bobbin case, so the rear slide block 28, together with the front slide block 29 and the bar-shaped dog 46, has a stroke of up to 46 mm. The spring 31 of the gap 30 is not compressed and the gap 30 is 8 mm. That is, the bar-shaped dog 46 is located 2 mm in front of the normal state in (a) above. At this time, the disk-side refill bobbin case forgetting slit 43 passes over the photosensor 51, and since the rear end of the bar-shaped dog 46 does not close the slit 43, the photosensor 51 detects an error and the bobbin case is forgotten. The case exchange device 1 stops.

(a) Empty bobbin case removal error detection FIG. 10 is an operation diagram when the drive shaft 16 is rotated and the phase is 270° (immediately after [Basic operation] (11)). I'm trying to install it on.

FIG. 6A shows a case where a replenishment bobbin case B is attached to the hook 64 from which the empty bobbin case A was taken out in the normal state, that is, in the previous [basic operation] (4). The slides of the rear slide block 28 and the front slide block 29 are in the middle of their strokes, and the refill bobbin case B is not in contact with anything, so the spring 31 (see FIG. 3) in the gap 30 is not compressed, and the gap 30 is 8 mm. At this time, the disk-side empty bobbin case slit 44 passes over the photosensor 51, but since the rear part of the bar-shaped dog 46 closes the slit 44, the photosensor 51 does not detect an error.
Note that the distance from the front end of the front slide block 29 to the photosensor 51 is 91 mm.

FIG. 4B shows a case where a replenishment bobbin case B is attached to the hook 64 in which an empty bobbin case A remains due to an error, that is, an unloading error in the previous [basic operation] (4). The sliding of the rear slide block 28 and the front slide block 29 is in the middle of the stroke, but since the refill bobbin case B hits the empty bobbin case A, the front slide block 29 and the bar-shaped dog 46 have already stopped sliding, and the rear slide block 28 and the bar-shaped dog 46 have already stopped sliding. Only the side slide block 28 slides 4 mm while compressing the spring 31 in the gap 30, and the gap 30 is reduced from 8 mm to 4 mm. That is, the bar-shaped dog 46 is located 4 mm behind the normal state in (a) above. At this time, the disc-side empty bobbin case slit 44 passes over the photosensor 51, and the bar-side empty bobbin case slit 48 matches the slit 44, so the photosensor 51 detects an error and replaces the bobbin case. Device 1 stops.

(C) Replenishment bobbin case removal error detection FIG. 11 is an operation diagram when the drive shaft 16 is rotated and the phase is 290° (immediately after [Basic operation] (12)). I'm about to finish installing it.

FIG. 6A shows a case where the replenishment bobbin case B, which was taken out from the replenishment bobbin case receiver 2 and held in the previous [basic operation] (9), is attached to the hook 64 in the normal state. Similarly to (a) above (although the locations are different), the lower presser plate 9 and the upper presser plate 13 press the replenishment bobbin case B, so the gap 30 is reduced from 8 mm to 6 mm. At this time, the disc-side replenishment bobbin case slit 45 passes over the photosensor 51, but the rear end of the bar-shaped dog 46 closes the slit 45, so the photosensor 51 does not detect an error.

FIG. 6(b) shows an error, that is, a case where an attempt is made to attach a replenishment bobbin case to the hook 64, which has not been gripped due to an error in taking it out from the replenishment bobbin case receiver 2 in the previous [basic operation] (9). Similarly to (a) and (b) above (although the locations are different), the lower presser plate 9 and the upper presser plate 13 do not press the replenishment bobbin case, so the gap 30 is 8 mm. That is, the bar-shaped dog 46 is located 2 mm in front of the normal state in (a) above. At this time, the disc-side replenishment bobbin case slit 45 passes over the photosensor 51, and since the rear end of the bar-shaped dog 46 does not close the slit 45, the photosensor 51 detects an error, and the bobbin case The exchange device 1 stops.

(d) Detecting the origin of the drive shaft 16 When the drive shaft 16 rotates once and reaches the correct phase of 0° (origin), the disc-side origin detection slit 42 and the bar-side origin detection slit 47 are detected on the photo sensor 51. Since they match, the photo sensor 51 detects the origin and the bobbin case changing device 1 stops.

In order to detect the above three types of errors and detect the origin of the drive shaft 16, the control device 70 of the error detection device 40 operates according to the flowchart of FIG. 12, the time chart of FIG. 13, and the following explanation. It is configured.

(1) When the sewing machine operator turns on the start switch 71 (S1 in FIG. 12), the drive motor 14, which is energized by the motor driver 72, starts rotating based on the pulse generated by the pulse generator (S2), and the pulse count is counted. starts counting pulses (S3).

(2) During normal times when the photosensor 51 does not detect any of the open slits 42-45, the pulse counting section continues counting pulses (S4-S6-S3).

(3) When the photo sensor 51 detects any of the slits 42 to 45 (S4), a slit detection flag is set (S5), and the pulse count section counts the number of pulses to detect the slit width in addition to counting one round. continues until the count reaches 120 (S6-S7-S8), and confirms the sensor status (S9).

(4) Here, since the slit width of the disk-side origin detection slit 42 is 7.5° in terms of rotation angle, it is approximately 210 (≒10000/360×7.5) when converted to the number of pulse counts (Fig. 13(a)), if the sensor state is "H" at the time of 120 pulses, it is determined that the origin detection slit 42 on the disc side has been detected, which indicates the completion of normal operation rather than an error, and the motor is stopped and the origin position is detected. The operation is completed (S9-S14-S15).

(5) On the other hand, since the slit width of the error detection slits 43, 44, and 45 is 2.5 degrees in rotation angle, it is approximately 70 (≒10000/360×2.5) when converted to the number of pulse counts. (FIG. 13(b)), if the sensor state is "L" at the time of 120 pulses, it is determined that one of the errors has been detected, and the motor is stopped (S9-S10).

(6) The pulse counting section that detected the error then identifies the type of error, as shown in FIG. 13(c).
As shown in (A) (FIG. 9) above, when the disk side refill bobbin case forgetting slit 43 reaches the photo sensor 51 at a phase of 160° and an error is detected in the slit 43, the number of counted pulses is approximately 4560. (≒10000/360×160+120).
As shown in (A) (FIG. 10) above, when the disc-side empty bobbin case slit 44 reaches the photo sensor 51 at a phase of 270° and an error is detected in the slit 44, the number of counted pulses is approximately 7620 ( ≒10000/360×270+120).
As shown in (c) (FIG. 11) above, when the disc-side replenishment bobbin case slit 45 reaches the photo sensor 51 at a phase of 290° and an error is detected in the slit 45, the number of counted pulses is approximately 8180 ( ≒10000/360×290+120).
Furthermore, when the origin is detected, the number of counted pulses is 10,000.

Therefore, the pulse counting section determines whether the detected error is (a) an error in forgetting to insert a refill bobbin case, (b) an error in taking out an empty bobbin case, or (c) an error in taking out a refill bobbin case, based on the number of pulses already counted. d) Identifies whether the origin is detected and outputs it, causing the LED of the transmission device 80 to emit light. Here, the following two examples will be given as examples of how to identify and emit light.

[a] A full-color LED is used in the transmission device 80, and for example, when (a) is identified, it lights up yellow, when (b) is identified, it lights up red, and when (c) is identified, it lights up green. (d) Turn on the blue light when detecting the origin. The lighting may be blinking.

[b] As mentioned in the [Problem to be solved by the invention] section, in (a) the sewing machine user needs to prepare and carry a refill bobbin case, but in (b) and (c), this is not possible. There's no need. According to this sewing machine user's perspective, (a) and (c) may be treated as the same without distinction. Therefore, as shown in FIG. 13(c), an error determination standard 6500 is set, and detections (a) and (c) exceeding this 6500 are treated as one type of error detection without distinction. Then, a full-color LED is used in the transmission device 80, and for example, when (a) is identified, yellow is lit, (b) and (c) are identified, red is lit, and (d) when the origin is detected, blue is lit. lights up. The lighting may be blinking.

As explained above, according to this embodiment, it is possible to not only detect multiple types of errors that occur in the bobbin case changing device, but also to notify the sewing machine user of which error has occurred so that the bobbin case changing device can Since the error can be found without any investigation, it is possible to efficiently take measures to eliminate the error. Note that the transmission device 80 may be installed at or near the bobbin case exchange device, or may be installed at a location away from the bobbin case exchange device.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be modified and embodied as appropriate without departing from the spirit of the invention.
(1) The type of error is communicated through letters, graphics, sounds, voices, etc. using the above-mentioned display or sound device as the communication device.
(2) To implement the present invention in a multi-head sewing machine, and to use the transmission device as an operation screen of the multi-head sewing machine, so that it is possible to centrally display which sewing machine head the bobbin case exchange device for which error has occurred.

A Empty bobbin case B Refill bobbin case 1 Bobbin case exchange device 2 Refill bobbin case receiver 14 Drive motor 16 Drive shaft 40 Error detection device 41 Disc-shaped dog 42 Origin detection slit on the disc side 43 Slit for forgetting the refill bobbin case on the disc side 44 Slit for the empty bobbin case on the disc side 45 Slit for the replenishment bobbin case on the disc side 46 Bar-shaped dog 47 Origin detection slit on the bar side 48 Slit for the empty bobbin case on the bar side 51 Photo sensor 60 Sewing machine 61 Bed 64 Hook 70 Control device 71 Start-up Switch 72 Motor driver 73 MCU
74 Clock signal generation circuit 75 Pulse output circuit 76 Counter circuit 77 Judgment circuit 80 Transmission device

Claims (11)

An error detection device (40) that detects multiple types of errors in a bobbin case changing device of a sewing machine,
a dog (41) that rotates in synchronization with the drive shaft (16) of the bobbin case exchange device and is provided with a plurality of detected parts (43-45) at rotational positions depending on the type of error;
a sensor (51) that is provided near the dog (41) and detects a detected part (43-45) that is reached by rotation of the dog (41);
a control device (70) that identifies and outputs the type of error based on the difference in arrival timing of the detected part (43-45) detected by the sensor (51);
An error detection device for a bobbin case changing device, comprising: a transmission device (80) that transmits the type of error output by a control device (70) to a sewing machine user. The multiple types of errors include an error in forgetting to insert a refill bobbin case into the refill bobbin case receiver (2), an error in taking out an empty bobbin case from the hook (64), and an error in taking out a refill bobbin case from the refill bobbin case receiver (2). An error detection device for a bobbin case changing device according to claim 1, comprising: an error detection device for a bobbin case changing device. The error detection device for a bobbin case changing device according to claim 1, wherein the detected portion (43-45) is an open slit, and the sensor (51) is a photo sensor that detects light passing through the open slit. The control device (70) includes a pulse generating section that generates pulses, a motor driver section that operates a drive motor (14) for rotating the drive shaft based on the pulses, a pulse counting section that counts the pulses, and a pulse generating section that operates the drive motor (14) for rotating the drive shaft based on the pulses. 4. The error detection device for a bobbin case exchange device according to claim 3, further comprising a determination unit based on a count number and a photosensor signal. 5. The error detection device for a bobbin case exchange device according to claim 4, wherein the pulse generating section, the pulse counting section, and the determining section are handled by a CPU (73). The pulse generation section is carried out by a circuit (74) that generates a clock signal and a circuit (75) that outputs pulses based on the clock signal, and the pulse count section is a counter circuit that counts pulses by counting the clock signal. 5. The error detection device for a bobbin case exchange device according to claim 4, wherein the determination circuit (76) is responsible for the determining section, and the determination circuit (77) is responsible for the determining section. The error detection device for a bobbin case changing device according to any one of claims 1 to 6, wherein the transmission device (80) is a light emitting device that emits a color depending on the type of error. 7. The error detection device for a bobbin case changing device according to claim 1, wherein the transmission device (80) is a display device that displays characters or figures depending on the type of error. The error detection device for a bobbin case changing device according to any one of claims 1 to 6, wherein the transmission device (80) is a sounding device that produces a sound or a voice depending on the type of error. The error detection device for a bobbin case changing device according to any one of claims 1 to 6, wherein the error detection device (40) is configured to also detect the origin of the drive shaft (16). In order to distinguish between error detection and origin detection, the detected part (43-45) for error detection is an open slit with a relatively narrow slit width, and the detected part (42) for origin detection is made of an open slit with a relatively narrow slit width. 11. The error detection device for a bobbin case exchange device according to claim 10, wherein the slit is relatively wide and the sensor (51) detects a difference in width between the two slits.

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