JP2000008291A - Control device for paper machine/coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a coater of a paper machine, capable of continuing the measurement as long as possible even when automatic calibration is being conducted by adjusting the timing between automatic calibration of both an upstream frame and a downstream one. SOLUTION: In the control device for a paper machine and a coater having (A) an upstream frame 10 having a reciprocating sensor scanning in the direction of width of paper, (B) a downstream frame 20 provided in the downstream side of the frame 10 and having a reciprocating sensor scanning in the direction of width of paper and (C) a synchronous operation part 30 for synchronizing the travel motion of sensors so as to measure the to-be-measured portion once measured in the position of the frame 10, further in the position of the frame 20 as well, and performing automatic calibration at a preferred interval of timing by sensors in both frames 10 and 20, the sensor of the frame 20 shifts to the mode of automatic calibration after a wait of transport lag time when the sensor of the frame 10 has shifted to the mode of automatic calibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper machine / coating machine control device for controlling the thickness of paper or sheet produced by a paper machine or a coating machine, and more particularly to a paper machine / coating machine control device which uses a plurality of thickness gauges to pinch. The present invention relates to an improvement for measuring a change in a control amount in a selected section.

[0002]

2. Description of the Related Art As disclosed in, for example, Japanese Patent No. 2748614, a paper machine / coating machine control device is provided with a plurality of frames and synchronously controls the running of sensors on both frames. , The amount of coating and the like are measured.

FIG. 2 is a block diagram of a paper machine / coating machine control device provided with a plurality of frames. The upstream frame 10 and the downstream frame 20 are provided on the basis of the paper flow direction. The coating machine is provided between the upstream frame 10 and the downstream frame 20. The synchronous operation unit 30 performs synchronous operation of sensor traveling in consideration of the transport time T, and also measures points measured on the upstream frame 10 on the downstream frame 20. Then, the coating amount applied to the paper is measured based on the difference between the measurement values of the sensors mounted on each frame.

[0004] In a paper machine, paper is made at a papermaking speed v. If the interval between the upstream frame 10 and the downstream frame 20 is L, the transport time T is L / v. In the measurement of the coating amount, it is necessary for the synchronous operation unit 30 to measure the points measured on the upstream frame 10 also on the downstream frame 20. Further, sensors such as a gravimeter and a moisture meter scan in the paper width direction along the upstream frame 10 and the downstream frame 20.

FIG. 3 is a timing chart of scanning and automatic calibration in each frame. FIG.
(B) represents a downstream frame. When the automatic calibration is performed in the upstream frame, the sensor also retreats in the downstream frame and starts the automatic calibration. And after the calibration is completed in the upstream frame, when the sensor starts running in the upstream frame,
The running of the sensor is started in synchronization with the downstream frame.

In the upstream frame, there are a time M _A1 used for the measurement value and a time M _A2 not used for the measurement value among the time allocated to the scan, and an autocal (AUTCAL) time for performing the automatic calibration. ing. In the downstream frame, there are a waiting time T for the synchronous operation of the sensor and a time _MB1 used for the measurement value among the time allotted for the scan, and an auto cal for performing the automatic calibration.
(AUTCAL) hour is assigned.

In a normal use such as a paper machine, the transport time T is shorter than the time required for one scan, so that there is no problem in controlling the coating amount.

[0008]

However, in applications where a plastic sheet is used for a capacitor, an electrode step, or the like, the transport time T may require 10 scans or more. At this time, if the amount of data that is not measured accompanying the automatic calibration increases, it has a considerable effect on coating amount control. The present invention solves such a problem, and adjusts the timing of the automatic calibration of the upstream frame and the automatic calibration of the downstream frame to continue the measurement as much as possible even after the automatic calibration is performed. It is an object to provide a control device.

[0009]

According to the present invention, there is provided a paper machine / coating machine controller according to claim 1 of the present invention.
Upstream frame 1 having a sensor that scans back and forth in the paper width direction
0, a downstream frame 20 having a sensor reciprocatingly scanned in the paper width direction installed on the downstream side of the upstream frame, and synchronization of the sensor running so that the location of the measured object measured by the upstream frame is also measured by the downstream frame. In the paper machine / coating machine control device, which has a synchronous operation unit 30 for performing the automatic calibration at an appropriate timing, when the sensor of the upstream frame shifts to the automatic calibration mode. Is characterized in that the sensor of the downstream frame shifts to an automatic calibration mode after waiting for a transport delay time.

According to the first aspect of the present invention, when the sensor of the upstream frame shifts to the automatic calibration mode, the sensor of the downstream frame shifts to the automatic calibration mode after waiting for the transport delay time. Synchronous operation can be performed for minutes.

In this case, the upstream frame starts scanning after completion of the automatic calibration after waiting for a time corresponding to the time required for the automatic calibration of the downstream frame. If the downstream frame is calibrated to start the synchronous operation of the sensor within a transport delay time from the start of scanning after the completion of the automatic calibration of the upstream frame, it is caused by the automatic calibration mode of the sensor as in claim 4. The time during which synchronous operation is not performed is minimized.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a traveling locus diagram of a sensor according to an embodiment of the present invention, wherein (A) shows an upstream frame 10 and (B) shows a downstream frame 20. Here, it is assumed that the transport delay time T between the upstream frame 10 and the downstream frame 20 is equivalent to three round trips of the sensor. The sensor performs reciprocating scanning between the F end and the B end in a normal measurement in each frame. Then, in the automatic calibration mode, the sensor moves to the retired area on the B end side and performs calibration.

In the device calibrated as described above, the running of the sensors in the upstream frame 10 and the downstream frame 20 in the automatic calibration mode is controlled as follows. First, the upstream frame 10 moves to the retirement area for automatic calibration, and starts calibration. At this time, the downstream frame 20 performs reciprocal scanning for the transport delay time T, and continues to calculate the difference between the sensor measurement values.

Next, the upstream frame 10 waits for the retirement time necessary for the automatic calibration of the downstream frame 20 and starts running the sensor after the automatic calibration. Here, the retirement time refers to the time from when the sensor is moved from the end B to the retirement area to perform calibration, and until the sensor is moved from the retirement area to the end B again.

Subsequently, within a transport delay time T from the start of traveling of the upstream frame 10, the sensor head of the downstream frame 20 moves to the F side to prepare for synchronous operation. In the above sequence, the time during which the difference calculation cannot be continued is only the time during which the downstream frame 20 waits for the synchronization timing on the F side, and the time during which the coating amount cannot be measured accompanying the automatic calibration is minimized.

In the above embodiment, the case where the sensor of the downstream frame 20 starts running from the end F in the synchronous operation has been described as an example. However, the present invention is not limited to this. May start traveling from the B end, and may also
May be the last position where the measurement of the upstream frame 10 is performed, or the first position where the measurement of the upstream frame 10 is restarted.

[0017]

As described above, according to the present invention, there is provided an upstream frame 10 having a sensor for reciprocally scanning in the paper width direction, and a downstream side of the upstream frame. A downstream frame 20 having a sensor for reciprocating scanning in the paper width direction installed in the paper frame, and a synchronous operation unit 30 for synchronizing the sensor travel so as to measure the location of the measurement target measured by the upstream frame also in the downstream frame. However, in the paper machine / coating machine control device in which the sensors of the upstream frame and the downstream frame perform automatic calibration at an appropriate timing, when the sensor of the upstream frame shifts to the automatic calibration mode, the sensor of the downstream frame is transported. Since the configuration shifts to the automatic calibration mode after waiting for the delay time, the non-measurement time during the automatic calibration can be minimized.

[Brief description of the drawings]

FIG. 1 is a traveling locus diagram of a sensor showing one embodiment of the present invention.

FIG. 2 is a configuration diagram of a paper machine / coating machine control device provided with a plurality of frames.

FIG. 3 is a timing chart of scanning and automatic calibration in each frame.

[Explanation of symbols]

 10 upstream frame 20 downstream frame 30 synchronous operation part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F069 AA46 BB07 BB20 BB34 DD15 FF05 GG58 GG65 JJ06 JJ13 JJ25 4F041 AA12 CA18 4F042 AA22 BA25 4L055 CD01 CD03 CD05 CD13 CH10 DA13 DA14 DA17 DA18 FA30

Claims (4)

[Claims] 1. An upstream frame (10) having a sensor for reciprocating scanning in the paper width direction, a downstream frame (20) having a sensor for reciprocating scanning in the paper width direction installed downstream of the upstream frame, and the upstream frame. A synchronous operation section (30) for synchronizing the sensor travel so as to measure the location of the measured object in the downstream frame also in the downstream frame, and the sensors of the upstream frame and the downstream frame perform automatic calibration at appropriate timing. In the machine / coating machine control device, when the sensor of the upstream frame shifts to the automatic calibration mode, the sensor of the downstream frame shifts to the automatic calibration mode after waiting for a transport delay time. Coating machine control device. 2. The paper machine / coating machine according to claim 1, wherein the upstream frame starts scanning after completion of the automatic calibration after waiting for a time required for the automatic calibration of the downstream frame. Control device. 3. The paper machine / coating apparatus according to claim 1, wherein said downstream frame starts synchronous operation of a sensor within a transport delay time from a start of scanning after completion of automatic calibration of said upstream frame. Machine control device. 4. The paper machine / coating machine control device according to claim 1, wherein the time during which the synchronous operation is not performed due to the automatic calibration mode of the sensor is minimized.