JP2739017B2 - Automatic guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop for a canvas, a felt, a wire, etc. of a paper machine, a printing machine, a machine for a film and the like .
The present invention relates to an automatic guide device applied to a belt .

[0002]

2. Description of the Related Art A conventional guide device will be described with reference to FIG.
One end of the guide roll 8 is supported rotatably about a vertical axis, and the other end a is suspended and supported by a suspension arm 15 movably in the front-rear direction. The center and the lower end of the suspension arm 15 are connected to a diaphragm 7 and a tension spring 6 having axes substantially parallel to the flow axis of the canvas 4. 5 are provided. The palm 5 contacts the side end 4a of the canvas 4 and is hingedly connected to the air valve 21 so as to be movable in the width direction. Further, the connection between the diaphragm 7 and the air valve 21 of the palm 5 is connected by an air pipe 9 and to an air source. In the figure, reference numeral 10 denotes a stand for the suspension arm 15, the diaphragm 7, and the spring 6.

[0003] In the above configuration, the palm 5 pressed against the side end 4a of the running canvas 4 is pushed in as the canvas 4 is biased toward the palm 5, and the air valve 21 at the root thereof is gradually opened. Open and reduce the pressure of the air pipe 9 connected to the valve 16. On the other hand,
Other terminal a is at the same time drawn to the stand 10 side by the usual spring 6, the stand 1 by the diaphragm 7
Extruded from zero and balanced. 6 'is diamond
This is the return spring of the flam 7. Here the diaphragm 7
When the pressure of the air pipe 9 connected to the guide roll 8 decreases , the other end a of the guide roll 8 moves rearward, that is, toward the stand 10, and acts in a direction to move the canvas 4 away from the palm 5. When the canvas 4 moves away from the palm 5 Conversely, reverse operation of these operation acts in a direction to approach the canvas 4 Palm 5. As described above, the canvas 4 is guided to run at a certain position in the width direction. In the figure, 22 is a pressure gauge, 23 is a pressure reducing valve, 24 is a pilot valve, and 25 is a pressure reducing valve.

[0004]

In recent years, the speed of a paper machine has been steadily increasing, and when the canvas 4 and the palm 5 are in contact with each other as in the conventional guide device shown in FIG. The wear of the palm 5 is severe, and damage is inevitable. Therefore, with the contact-type displacement amount detection method as shown in FIG. 6, damage to movable parts such as palm connection pins cannot be avoided. Therefore, the fact that the felt 4 and the palm 5 are in contact with each other includes the danger of an accident, for example, a damaged part hits the machine and damages the machine itself. Further, an air pipe is provided between the detection of the canvas side end 4a and the moving actuator of the guide roll 8, and a signal is transmitted as a pressure change. Therefore, the time constant of the response due to the compressibility of the air is large, and as a result, the felt Was meandering.

Since the displacement of the side end 4a of the canvas 4 is detected by the palm 5 or a sensor or the like, if there is a displacement due to a step or distortion of the canvas side end due to poor connection, the canvas 4 is not operated by the machine operation. And the non-linearity of the edge on the canvas side is detected as the moving distance. Therefore, in the offset correction, the non-linearity of the edge on the canvas side is also corrected, and the result is that irrelevant meandering of the canvas 4 is promoted. Furthermore, when the displacement amount is detected as being too large or too small, and the machine speed increases, the movement of the canvas 4 cannot be adjusted to the machine speed, and the meaningless correction that the timing of the offset correction does not match is performed. There was a drawback that was done. An object of the present invention is to provide an automatic guide device that can solve the above-mentioned conventional problems.

[0006]

Means for Solving the Problems The present invention for this purpose, the guide device of the looped belt endless, the guide roll moving at a thrust of the actuator to support the same belt, the same belt from the outside of the belt almost Same flat
A sensor that is provided on the surface opposite to the side end of the belt and detects the distance to the side end in a non-contact manner, and receives a width direction position signal of the belt detected by the sensor, and based on the signal, A control unit for controlling the thrust of the actuator, which is used as means for solving the problem. Further, the present invention is to form a sensor provided in opposition to the side end of the belt and detecting the distance to the side end in a non-contact manner by an ultrasonic sensor. Means.

[0007]

According to the present invention, the distance to the belt side end is not
A position signal in the width direction of the belt detected by the detection unit that detects the contact is received, and the signal is sent to the control unit. The control unit sends a signal to correct the belt position according to the input signal to the electro-pneumatic conversion unit. The electro-pneumatic converter applies a thrust to the actuator to correct the deviation of the belt according to the input, and operates the guide roll. As described above, the bias of the belt is adjusted by the non-contact detecting means.

The belt period and the synchronization signal detecting section
Detected by non-contact detection mark portion provided in order belt surface
This detects the belt period and synchronization signal, and
Signal to the controller that controls the thrust of the actuator.
You. In the control unit that receives these detection signals, the belt side end
Calculate the distance from the belt to the initial shape and the ratio
Then, only the original deviation of the entire belt is calculated.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention, and FIG. 2 shows a second embodiment of the present invention. In the embodiment of the present invention, the same portions as those of the conventional example shown in FIG. 6 will be described using the same reference numerals. First, in the embodiment of FIG. 1, a detection unit for detecting displacement in the canvas width direction, that is, an ultrasonic sensor 1, is provided so that an ultrasonic wave is applied to a canvas side end 4a on the side of the canvas 4 near the guide roll 8. Have been. The ultrasonic sensor 1 is connected to control means, that is, a controller 2. Then, the ultrasonic sensor 1 for detecting the end of the canvas 4 sends a detection signal indicating the displacement in the canvas width direction to the controller 2. Controller 2 that has received the detection signal
Is converted into a pressure signal by the electropneumatic converter 3, and the signal is sent to the diaphragm 7 for operating the guide roll 8, and the canvas 4 is adjusted so that the canvas 4 does not deviate from a predetermined position due to a change in the diaphragm pressure.

More specifically, when the canvas 4 approaches the ultrasonic sensor 1 from a certain position, the diaphragm pressure decreases, and the end of the guide roll 8 on the ultrasonic sensor 1 moves toward the diaphragm 7. As a result, the canvas 4 returns to a fixed position. In the opposite case, the diaphragm pressure rises and the guide roll 8 operates to the side where the end is pushed out. As a result, it also returns to a fixed position (FIGS. 3 and 4).
That is, in FIGS. 3 and 4, when the axis of the guide roll 8 is inclined, the canvas tries to move in the traveling direction B at the contact point A between the canvas 4 and the guide roll 8, but friction with the guide roll 8 occurs. Accordingly, the canvas 4 advances in the direction B 'with the rotation of the guide roll 8. The displacement is corrected by moving the bearing using this operation. As described above, the canvas 4 is controlled to be always at a fixed position and guided. In the first embodiment , paper dust and the like are used.
Ultrasound that is transparent to obstacles and highly reliable
Sensor 1 was used.
A position sensor may be used. Further, other driving devices such as an air cylinder and a motor may be used instead of the diaphragm 7.

Next, a second embodiment shown in FIG. 2 will be described. An electropneumatic converter 16 operated by a signal from a control unit (programmable controller 13) is used as a means for moving the guide roll 8, and the converter 16 Is connected to the diaphragm 7, the suspension arm 15, and the guide roll 8 via an air pipe 9. The detection unit includes an ultrasonic sensor 1 for measuring the position in the canvas width direction, and photoelectric switches 17 and 18 for detecting a canvas cycle and a synchronization signal.

In FIG. 2, the canvas side end 4a
The ultrasonic sensor 1 for detecting the displacement in the width direction of the computer 1 uses a programmable controller 1 to determine the distance to the canvas side end 4a.
Send to 3. The photoelectric switches 17 and 18 detect the tapes 11 and 12 which are detection mark portions pasted on the canvas 4 in advance, thereby detecting a canvas origin signal and a synchronization signal, and send the signals to the programmable controller 13. The programmable controller 13 receiving these detection signals calculates the distance from the canvas side edge 4a for each canvas cycle, and
Compared with the initial shape of “a” (that is, the play of the edge of one loop), only the original deviation of the entire canvas is calculated. When the distance from the fixed position which can be arbitrarily set in accordance with the signal is increased, the input signal of the electropneumatic converter 16 is controlled so that the pressure of the diaphragm 7 becomes in the direction of moving the guide roll 8 to the sensor 1 side.

[0013] When approaching the reverse, control is performed to perform the reverse operation. Therefore, the canvas 4 is controlled to be guided to a fixed position in accordance with only the original deviation of the canvas excluding the initial shape of the canvas side end 4a from the actually measured position in the canvas width direction. In this case, the tape is used for detecting the periodic signal and the synchronization signal. However, for example, a color may be applied to the canvas, sewing may be performed, or a pulse generator may be used. Also in this embodiment, cylinders and motors may be used instead of the diaphragm 7.
Further, ultrasonic sensors and photoelectric switches are used for the sensors, but other sensors such as optical sensors may be used, or a machine speed is measured, and a signal or a value corresponding to the machine speed is sent to the control unit. A method of substitution is also conceivable. FIG. 5 is a control flow for explaining the overall flow of the control unit and the apparatus.

[0014]

As described above in detail, according to the present invention, a sensor for detecting the distance to the side edge of the belt in a non-contact manner is provided so that the inspection surface of the sensor can be improved.
Being vertical, it is difficult for dust etc. to collect and resistant to dirt
Detection becomes possible. Also, the sensor mounting location is the belt width.
Become outside of the belt by belt flapping
This eliminates the contact between the belt and the sensor, eliminates the damage to the side end of the belt , and eliminates the need for a conventional contact movable palm. As a result, it is possible to prolong the life of the belt or to remove a risk factor (dropping of parts or the like into the machine) to the machine due to damage to the palm or the like. If high-speed processing can be performed as an electrical signal, high guide performance can be further maintained, and reliability and operation efficiency can be improved.

A detection mark portion provided on the belt surface
It detects a non-contact, activator period and synchronization signals of the belt
A detection unit that outputs to the control unit that controls the thrust of the
By removing the beam, the meaningless operation of the guide roll due to the initial shape of the belt side end as in the related art is eliminated, and
The movement of devices such as the diaphragm is reduced, and the life can be extended. Even for a belt with a long loop length, by taking many synchronization signals in one cycle, the initial shape of the belt side end is compared for each phase without waiting for one cycle of the belt, and the original shape excluding the initial shape is removed. Belt deviation can be processed in a short time.

[Brief description of the drawings]

FIG. 1 is a perspective view of an automatic guide device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of an automatic guide device according to a second embodiment of the present invention.

FIG. 3 is a plan view illustrating a method for correcting a displacement of a canvas.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is an explanatory diagram showing a control flow in a second embodiment of the present invention.

FIG. 6 is a perspective view showing an example of a conventional canvas guide device.

FIG. 7 is an explanatory diagram of an effect when control is performed according to FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ultrasonic sensor 2 Controller 3 Electropneumatic converter 4 Canvas 4a Canvas side end 6 Tension spring 7 Diaphragm 8 Guide roll 9 Air piping 10 Stand 14 Electric wiring 15 Suspension arm 16 Electropneumatic converter 17, 18 Photoelectric switch

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhito Ohira 5007 Itozaki-cho, Mihara-shi, Hiroshima Pref. Mihara Works, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-63-117865 (JP, A) JP-A-60 JP-A-137752 (JP, A) JP-A-58-58411 (JP, A) JP-A-50-8260 (JP, A) JP-A-62-501520 (JP, A) ) Fully open 1979-31283 (JP, U) Fully open 1984-108727 (JP, U) Fully open 1986-44055 (JP, U) Fully open 1979-162176 (JP, U) 12777 (JP, B1) Jiko 58-37883 (JP, Y2)

Claims (2)

(57) [Claims] 1. A guide device of the looped belt endless, the guide roll moving at the actuator thrust to support the same belt, the base from the outside of the belt
A sensor that is provided on substantially the same plane as the belt and faces the side end of the belt and detects the distance to the side end in a non-contact manner, and receives a width direction position signal of the belt detected by the sensor. A control unit that controls the thrust of the actuator based on the signal. 2. An automatic sensor according to claim 1, wherein a sensor provided opposite to the side end of the belt and detecting a distance to the side end in a non-contact manner is formed by an ultrasonic sensor. Guide device.