JPH1150344A - Detection of opening abnormality of opening device in loom, and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for readily and surely detecting opening abnormality, by which the opening abnormality can be detected in a noncontact state of the heddle frame and a detecting device at a higher detecting accuracy compared to a magnetic type detecting sensor by detecting the opening abnormality of the opening apparatus by a load torque of a driving motor. SOLUTION: A loom controller takes in a motor torque detected by a torque detecting device. When the torque is changed from a negative value to a positive value, a rotating angle of a loom main axis is taken in from a loom rotation detector. The loom controller recognizes the position of the heddle frame so that, when the heddle frame is at the highest position at the last time, the heddle frame may be at the lowest position (steps S3 to S5). The loom controller takes in the angle of the loom main axis from the loom rotation detector when the heddle frame reachs the position (step S6), and collates the upper and lower position of the heddle frame and the angle of the main axis at this time with an opening pattern (S7). When the upper and lower position of the heddle frame does not agree with the opening pattern, a disorder-generation treatment against generation of displacement of a weaving pattern is carried out (S8 and S11) in the method for detecting abnormal opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting an abnormal opening of a shedding device of a loom. More specifically,
The present invention relates to a method and an apparatus for detecting an abnormal opening of a shedding device of a loom in which a drive motor is connected to each heald frame.

[0002]

2. Description of the Related Art Conventionally, in a loom, a heald frame is mechanically connected to a main shaft of the loom and is opened.

However, recently, it has been proposed to connect a drive motor to each heald frame of a loom, and to control the shed frame opening with the use of the drive motor in synchronization with the rotation of the main shaft of the loom (for example, see Japanese Patent Laid-Open No. 7-324247, JP-A-6-272131).

In order to mount the drive motor on each heald frame and rotate the drive motor in synchronization with the main shaft of the loom to raise and lower the heald frame in an arbitrary opening pattern, the heald frame must It is necessary to monitor activities. Unless it is monitored whether or not the movement of the heald frame is performed accurately, there arises a problem that a desired fabric cannot be woven because the heald frame does not operate in a predetermined opening pattern.

That is, the heald frame moves from the uppermost point to the lowermost point or from the lowermost point to the uppermost point with respect to the rotation of the main shaft of the loom in accordance with the operation pattern set in advance in the loom controller, or the heald frame is moved to the upper dead center. Alternatively, the drive motor is driven by controlling the servo amplifier from the loom controller so as to stop at the bottom dead center. At this time, the heald frame performs the opening operation by the rotation of the drive motor, but between the drive motor and the heald frame,
For example, since it is connected via a mechanism such as an eccentric disc, the controller may not be able to detect even if the heald frame does not move up and down correctly only by monitoring the rotation amount of the drive motor. For this reason, a heald frame position detection sensor is attached to the upper or lower portion (generally, the uppermost portion) of the heald frame to monitor whether the heald frame is operating normally (for example, see Japanese Unexamined Patent Publication No.
248535).

As such a heald frame position detection sensor, a non-contact type sensor is preferable because the heald frame moves rapidly, and a magnetic detection sensor is generally used as the non-contact type sensor. I have. However, such a detection sensor can only detect the presence or absence of a heald frame, cannot detect the movement amount of the heald frame, and has a very poor detection accuracy. On the other hand, a laser sensor that detects the time from the emission of a laser beam to its return can accurately detect displacement, but it is extremely expensive, so employing such a laser sensor increases the price. Difficult.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus capable of detecting an abnormal opening of a shedding device of a loom with a simple structure in view of the above-mentioned problems.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide a shedding apparatus for a loom in which a drive motor is connected to each heald frame, and the opening torque of the shed apparatus is detected by the load torque of the drive motor. It is achieved by a method for detecting an opening abnormality of an opening device of a loom, characterized in that: In this case, it is preferable to detect the opening abnormality of the opening device when the change in the load torque of the drive motor does not match the change in torque based on the preset opening pattern.

More specifically, when the load torque of the drive motor changes from negative to positive, it is recognized that the heald frame has reached the highest point or the lowest point, or the load torque of the drive motor has changed from positive to negative. It is preferable to recognize that the heald frame has reached the center position when it changes to a negative value, and compare the positions of the heald frames with the opening pattern to detect an opening abnormality of the opening device. In this case, it is preferable to detect the main shaft angle of the loom when the position of the heald frame is recognized, and to collate the angle with the opening pattern.

Further, it is preferable that when the load torque of the drive motor becomes zero, the heald frame is recognized as being in a stationary state, and that state is compared with an opening pattern to detect an opening abnormality of the opening device. . In this case, it is preferable to detect the loom main shaft angle when the state of the heald frame is recognized, and to collate the angle with the opening pattern. If the heald frame continues to stop at the uppermost point or the lowermost point contrary to the opening pattern, the operation of the heald frame may be abnormal. It is preferable that an abnormal opening signal is also generated.

The present invention further provides a drive motor connected to each heald frame, an opening pattern storage means for storing an opening pattern of the heald frame, and a torque detecting means for detecting a load torque of the drive motor. Means for comparing a heald frame position determined from a change in load torque detected by the detection means with an opening pattern stored in the opening pattern storage device, and transmitting an abnormal signal when the two do not match. An opening abnormality detection device for an opening device of a loom, comprising:

In the present invention, the drive motor may be a servomotor, and a monitor signal of a control amplifier for controlling the servomotor may be used as a load torque of torque detecting means for detecting a load torque.

When the opening abnormality of the loom opening device of the loom is detected according to the present invention, it is preferable to display the opening abnormality and stop the operation of the loom.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in the apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-324247 will be described below with reference to the drawings. In FIG. 1, swing levers 3A and 3B are rotatably supported inside left and right side frames 1 and 2 of the loom. The swing of the swing lever 3A is transmitted to the swing lever 3B via the transmission rod 4, and both swing levers 3A and 3B swing synchronously. Connecting rods 5A, 5B are vertically attached to the swing levers 3A, 3B, and a plurality of heald frames S ₁ , S ₂ , S ₃
(Only five are shown in FIG. 2) are supported by a pair of connecting rods 5A and 5B, respectively. The swing of the swing levers 3A and 3B is performed by the connecting rod 5
A, is converted to the heald frames S _1, S ₂ ... vertical movement through a 5B, heald frames S _1, S ₂ ... it is U-shaped cross-section guide 6
It is guided by A and 6B and moves up and down.

As shown in FIGS. 1 and 2, the first side frame 1 has a support shaft 7 extending along the arrangement direction of the heald frames S ₁ , S ₂ ... (Perpendicular to the plane of FIG. 1). , And a jack lever 8 is rotatably supported on the support shaft 7 at a position corresponding to each of the heald frames S ₁ , S ₂ . Each jack lever 8 is connected to the swing lever 3A via a connecting rod 9.

Further, a support shaft 10 is provided in parallel with the support shaft 7. The same number of driven gears (large-diameter gears) G ₁ , G _2, ... As the heald frames S ₁ , S ₂ ,. Each of the driven gears G ₁ , G _2, ... Is provided with a shaft support 12 at an eccentric position, and a swing lever 13 is rotatably supported on each shaft support 12. The swing lever 13 is rotatably connected to the jack lever 8.

The driven gears G ₁ , G _2, ... Have an outer diameter larger than the outer diameter of the swing lever 13. Each support 12
The thickness of the formed slightly smaller than the thickness of the swing lever 13, the driven gear G _1, G ₂ ... thickness comprising shaft support 12 is formed to be almost equal to the heald frame S _1, S ₂ ... arrangement pitch of ing.

On the front surface of the first side frame 1 shown in FIG. 1, variable speed drive motors (servo motors) M ₁ and M _{2 are provided.}
... is fixedly installed. The drive motors M ₁ , M _2, ... Are arranged at equal or unequal intervals along the circumferential direction of the gears G ₁ , G ₂ ,. Each drive motor M _1, M ₂ ... drive shaft to each of the dynamic gear G _1, G ₂ ... meshed with corresponding driving gears g _1, g ₂ ... is provided. The drive gears g ₁ , g _2, ..., When each of the drive motors M ₁ , M _2, ... Are used, are reduced to a speed corresponding to the rotation speed of the loom only by meshing with the gears G ₁ , G ₂ ,. Swing bar 1
3 is set to the number of teeth that can be driven.

Each of the drive motors M ₁ , M ₂ ... Is provided with a rotary encoder (not shown) for outputting its rotation angle information. The drive motors M ₁ , M ₂ ... Are controlled by an aperture control computer C ₁ . Heald frame S ₁ in the opening control computer C ₁ each heald frame S _1, S ₂ ... opening pattern (one cycle of the loom, S
₂ ... opening position patterns) are input in advance.

The drive motors M ₁ , M ₂ ... Are servo motors and are connected to an aperture controller 33 via a servo amplifier 34 as shown in FIG. The loom rotation detector 32 transmits a loom main shaft angle signal to the loom controller 31 and the shedding controller 32, and the shedding controller 33 is controlled by the loom controller 31.

The drive motor M
_1, the current value flowing M ₂ ... to is detected by the torque detector 36, the detection signal of the torque detection device 36 is input to the loom controller 31. The torque detecting device 36 is a torque detecting means for detecting the load torque of the drive motor according to the present invention.

[0022] As described above, the drive motor (servo motor) M _1, M ₂ ... are connected to a drive gear g _1, g ₂ ..., drive gear g _1, g ₂ ... rotation of large-diameter driven Gear G
_1, G ₂ ... transmitted to. The driven gears G ₁ , G _2, ... Are provided with eccentric disks, and the rotational motion of the driven gears G ₁ , G _2, ... Is converted into reciprocating motion, and the heald frames S ₁ , S ₂ .

The loom controller 31 constitutes an opening pattern storage means for storing the opening pattern of the heald frame in the present invention. The loom controller 31 stores the heald frames S ₁ , S ₂ . An opening pattern that determines the descent and stop is stored in advance. Opening pattern from the loom controller 31 to the shedding controller 33 is sent, to determine the drive motor M _1, M ₂ ... rotation amount of the basis of the loom main shaft rotational position the opening patterns in the shedding controller 33, an instruction to the servo amplifier 34 put out.

The servo amplifier 34 drives drive motors (servo motors) M ₁ , M ₂ . At this time, the current flowing through the drive motors M ₁ , M _2, ... Is detected by the torque detection device 36, and this detection signal is sent to the loom controller 31. Since the change in value of the current flowing through the drive motor M _1, M ₂ ... is to match the change in the load torque, the drive motor M ₁ by the detection signal by the torque detector 36, M
₂ It is possible to know the change state of the load torque of.

FIG. 3 shows the relationship between the operation of the heald frames S ₁ , S _2, ... And the torque generated by the motor. That is,
While the heald frames S ₁ , S ₂ ... Rise from the lowest point, the motor torque draws a sine curve with a half cycle, and the heald frames S ₁ , S 2
₂ ... Is in the middle of ascent or descent (opening center position), the motor torque changes from positive to negative. When the heald frames S ₁ , S _2, ... Reach the highest point or the lowest point, the motor torque switches from negative to positive. Hereinafter, the motor torque changes similarly.

Since the driven gears G ₁ , G _2, ... Use eccentric disks, the load torque applied to the drive motors M ₁ , M _2, ... During one rotation of the driven gears G ₁ , G ₂ ,. In particular, when the heald frames S ₁ , S _2, ... Reach the uppermost position and the lowermost position,
The load torque has a characteristic of switching from negative to positive.

The loom controller 31 detects a zero crossing at which the torque signal changes from negative to positive and compares it with the loom main shaft angle at that time, so that even if the control state of the shedding controller 33 is not known, the loom angle can be determined. It is possible to know how many times the heald frames S ₁ , S ₂ ... Have reached the highest point or the lowest point.

Since the opening patterns of the heald frames S ₁ , S _2, ... Are preset in the loom controller 31, the heald frames S1, S2,.
_1, S ₂ ... by comparing the operation of the, if matched shedding controller 33, servo amplifier 34, a series of opening devices are operating properly in the drive motor (servo motor) M _1, M ₂ ... and the reduction mechanism The loom controller 31 can determine that the shedding operation is normal.

Conversely, when the phases of the heald frames S ₁ , S _2, ... Controlled by the control abnormality of the opening controller 33 are out of phase, or due to a mechanical problem, the opening controller 33, the servo amplifier 34, motor)
If the heald frames S ₁ , S _{2, etc.} have stopped even though M ₁ , M _2, ... Are normal, the loom controller 31 can detect an abnormality.

FIG. 4 is a flowchart showing the above operation. That is, the loom controller 31 takes in the motor torque detected by the torque detecting device 36. here,
The loom controller 31 takes in the loom main shaft rotation angle from the loom rotation detector 32 when the torque is switched from negative to positive. At this time, the loom controller 31 controls the heald frames S ₁ , S ₂
Is recognized as being at the lowest point this time if it was at the highest point last time, and is recognized as being at the highest point this time if it was at the lowest point last time (steps S3, S4, S
5). Next, the loom controller 31 captures from the loom rotation detector 32 the loom spindle angle at which the heald frames S ₁ , S _2, ... Have reached the position (step S 6), and the current heald frames S ₁ , S ₂ ,.
The vertical position of S ₂ ... And the reached main shaft angle of the loom are compared with the opening pattern (step S7).

If the vertical position of the heald frame does not match the opening pattern, an abnormality occurrence processing for the occurrence of a weaving pattern, that is, a stop of the loom and an abnormality signal is generated (steps S8 and S11). ). On the other hand, even when the vertical position of the heald frame matches the opening pattern,
If the loom main shaft angles at which the heald frames S ₁ , S ₂ ... Reach the position do not match the opening pattern, the drive motor and the loom main shaft are out of synchronization, and the abnormality occurrence processing is performed similarly ( Steps S8 and S11).

In the above embodiment, the opening pattern is compared with both the vertical position of the heald frame and the arrival angle thereof, but the comparison may be made with only one of them. For example, the determination may be made only in step S8, and only the woven pattern deviation may be detected. Conversely, in step S9, both the woven pattern deviation and the synchronization deviation may be collectively performed to perform the abnormality generation processing.

Further, the abnormality occurrence processing in step S8 may be performed when the synchronization deviation between the heald frame and the main shaft of the loom has exceeded a predetermined amount.

Further, as shown in FIG. 5, when the motor torque is switched from positive to negative, it is recognized that the heald frame is at the center position, and when the motor torque is zero (0), The heald frame may be recognized as being stationary, and may be compared with the opening pattern.

It should be noted that a motor torque curve based on the opening pattern may be set in advance, and the opening abnormality may be detected by comparing the curve with the detected torque.

[0036]

According to the present invention, the driving motors M ₁ , M ₂ .
To the torque change detecting the heald frame S _1, S ₂ ... position, the heald frame S _1, S ₂ ... and the detector can be detected without contact, the detection accuracy when compared with conventional magnetic sensor It is extremely high, and an abnormal opening can be easily and reliably detected.

Further, in the present invention, since the number of mechanical detection elements is small as a method of detecting the position of the heald frame, it is possible to greatly reduce sensor malfunctions and detection errors due to loom vibrations and the like.

[Brief description of the drawings]

FIG. 1 is a partially broken front view of an embodiment of a loom according to the present invention.

FIG. 2 is a partially omitted perspective view of a main part of the embodiment shown in FIG. 1;

[Figure 3] is a diagram showing a relationship of a heald frame S _1, S ₂ ... operation and the motor generator torque, the horizontal axis represents the crank angle of the loom main shaft, (a) shows the running frame S _1, S ₂ ... The behavior of
(B) shows the generated torque of the motor.

FIG. 4 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of another embodiment of the present invention.

[Explanation of symbols]

S ₁ heald frame S ₂ heald frame M ₁ drive motor M ₂ drive motor

Claims (7)

[Claims] 1. An opening device of a loom, wherein an opening abnormality of the opening device is detected by a load torque of the driving motor in a shedding device of a loom in which a driving motor is connected to each heald frame. Anomaly detection method. 2. The weaving machine according to claim 1, wherein when a change in load torque of the drive motor does not match a change in torque based on a preset opening pattern, an opening abnormality of the opening device is detected. Opening abnormality detection method for an opening device of the invention 3. When the load torque of the drive motor changes from negative to positive, the heald frame is recognized as reaching the uppermost point or the lowermost point, and the position is compared with an opening pattern to check the position of the heald frame. The method according to claim 1 or 2, wherein an opening abnormality is detected. 4. When the load torque of the drive motor changes from positive to negative, it is recognized that the heald frame has reached the center position, and the position is compared with an opening pattern to detect an opening abnormality of the opening device. 3. The method according to claim 1, wherein the opening abnormality of the weaving machine is determined. 5. When the load torque of the drive motor becomes zero, the heald frame is recognized as being in a stationary state, and the state is compared with an opening pattern to detect an opening abnormality of the opening device. 3. The method according to claim 1 or 2, wherein the opening is detected by the opening device of the loom. 6. A weaving machine main shaft angle when the heald frame position or state is recognized is detected, and the angle is compared with an opening pattern to detect an opening abnormality of the shedding device. The opening abnormality detection method for an opening device of a loom according to any one of claims 1 to 5. 7. A drive motor connected to each heald frame, an opening pattern storage means for storing an opening pattern of the heald frame, a torque detection means for detecting a load torque of the drive motor,
And transmitting means for transmitting an abnormal signal when the heald frame position determined from the change in the load torque detected by the detecting means and the opening pattern stored in the opening pattern storage device are not matched with each other. Opening abnormality detection device of the opening device of the loom.