JP2017078682A - Measurement system and measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measurement system with which it is possible to improve a time resolution.SOLUTION: A measurement system 1, designed to measure the peripheral velocity of a guide roll 10, has three sensors 5a-5c each for detecting a marker 111 provided in three rows in the direction of the rotation shaft of a guide roll 10, and a measurement device 3 for calculating the peripheral velocity of the guide roll 10 on the basis of detection timing of the marker 111 by the sensors 5a-5c. The two rows of markers 111 are out of alignment in the direction of roll rotation and partly overlap in the direction of roll rotation, and the measurement device 3 calculates the peripheral velocity of the guide roll 10 on the basis of a gap in the detection timing of these two rows of markers 111 by the sensors and a positional deviation in the rotation direction of the markers 111.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a measurement system and a measurement method for measuring a peripheral speed of a rotating body such as a guide roll.

  In the printing press, a guide roll is used for transporting paper, and the peripheral speed of the guide roll is measured for printing management. Conventionally, a tachometer is generally used for measuring the peripheral speed of a guide roll.

  Patent Document 1 describes an example in which a marker is formed on the surface of an object to be measured and the moving speed of the object to be measured is measured by detecting the marker with a photoelectric sensor.

JP 2004-69933 A

  In the conventional tachometer measurement, the reflective tape affixed to the guide roll is read, and the number of data points is one per circumference of the guide roll, resulting in a problem that the time resolution of the measurement data becomes coarse.

  Even when the marker is detected by a sensor, there is a limit to the realizable time resolution. For example, when detecting a change in peripheral speed that occurs in a short time, such as slip of a guide roll, it is necessary to make the marker and its pitch as fine as possible. However, if the marker is made finer than the spot diameter of the sensor, the marker cannot be read. When a sensor with a spot diameter D was used, the limit of the line width that could be read was D, and the time resolution in that case was limited to D / V when the peripheral speed was V.

  The present invention has been made in view of the above problems, and an object thereof is to provide a measurement system capable of improving time resolution.

  1st invention for solving the subject mentioned above is a measuring system which measures the peripheral speed of a rotating body, Comprising: The sensor for each detecting the marker provided in the several rows in the rotating shaft direction of the said rotating body And a measuring device that calculates the peripheral speed of the rotating body based on the detection timing of the marker by the sensor, and two rows of the markers in the plurality of rows have positions in the rotational direction of the rotating body. And the measurement device is based on a detection timing shift of the two rows of markers by the sensor and a shift of the positions of the two rows of markers in the rotation direction. A measuring system characterized by calculating a peripheral speed of the rotating body.

  In the present invention, a plurality of rows of markers whose positions are shifted in the roll rotation direction are respectively detected by the sensors, and the peripheral speed is calculated from the deviation of the detection timing of the markers by the sensor and the deviation of the positions of the markers. The peripheral speed at a shorter distance can be measured. Therefore, the peripheral speed can be measured with a time resolution finer than the time resolution defined by the line width of the marker that can be read by the sensor.

In each row, a plurality of the markers are provided along the rotation direction, and the pitch between the tips in the rotation direction is constant, and the position of the marker in the rotation direction is P, the number of rows It is desirable that P / N is shifted in each column when N is N.
By detecting the N rows of markers whose positions are shifted by 1 / N pitch as described above with the sensors, the peripheral speed of the rotating body can be continuously measured with the above time resolution without interruption.

The rotating body is, for example, a guide roll of a printing press.
By applying the present invention to a guide roll of a printing press, it is possible to capture a peripheral speed change that occurs in a short time such as a slip.

  The second invention is a measuring method for measuring the peripheral speed of a rotating body, wherein each of the markers provided in a plurality of rows in the rotational axis direction of the rotating body is detected by a sensor, Calculating the peripheral speed of the rotating body based on the detection timing of the marker by a sensor, and the two rows of markers in the plurality of rows are displaced in the rotational direction of the rotating body, and A part of the rotating device overlaps in the rotation direction, and the measuring device detects the rotation body based on a shift in detection timing of the two rows of markers by the sensor and a shift in position of the two rows of markers in the rotation direction. It is the measuring method characterized by calculating the peripheral speed of.

In each row, a plurality of the markers are provided along the rotation direction, and the pitch between the tips in the rotation direction is constant, and the position of the marker in the rotation direction is P, the number of rows It is desirable that P / N is shifted in each column when N is N.
The rotating body is, for example, a guide roll of a printing press.

  According to the present invention, a measurement system capable of improving time resolution can be provided.

Diagram showing measurement system 1 The figure which shows the hardware constitutions of the measuring apparatus 3 The figure which shows the marker 111 of the marker row | line | columns 11a-11c Flow chart showing the measurement method The figure which shows transition of ON / OFF signal of sensors 5a-5c The figure which shows the marker 111 of the marker row | line | columns 11a-11d

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

(1. Measurement system 1)
FIG. 1 is a diagram showing a measurement system 1 according to an embodiment of the present invention. The measurement system 1 measures the peripheral speed (rotational speed) of the guide roll 10 by detecting a marker 111 on the surface of the guide roll 10 that is a rotating body.

  In the present embodiment, the guide roll 10 is a guide roll 10 of a printing press (not shown), and conveys a web-like sheet as the conveyed product 20. The guide roll 10 is not driven by itself, but is a driven roll that rotates due to friction with the conveyed product 20 being conveyed.

  As shown in FIG. 1, the measurement system 1 includes a measurement device 3, sensors 5a to 5c, and the like.

  The measuring device 3 calculates the peripheral speed of the guide roll 10 based on the detection timing of the marker 111 by the sensors 5a to 5c.

  FIG. 2 is a diagram showing a hardware configuration of the measuring apparatus 3. As shown in FIG. 2, the measuring device 3 can be realized by a computer configured by connecting a control unit 31, a storage unit 32, an input unit 33, a display unit 34, a communication unit 35, and the like through a bus 36. However, the present invention is not limited to this, and various configurations can be taken as appropriate.

  The control unit 31 includes a CPU, a ROM, a RAM, and the like. The CPU calls and executes a program related to the processing of the measuring apparatus 3 stored in a storage medium such as the storage unit 32 and the ROM in a work memory area on the RAM. The ROM is a non-volatile memory, and permanently stores programs such as a computer boot program and BIOS, and data. The RAM is a volatile memory, and temporarily stores programs and data loaded from the storage unit 32, the ROM, and the like, and includes a work area used by the control unit 31 for performing various processes.

  The storage unit 32 is a storage medium such as a flash memory or a hard disk drive, and stores a program executed by the control unit 31, data necessary for program execution, an OS, and the like. These programs and data are read by the control unit 31 as necessary, transferred to the RAM, and executed.

The input unit 33 inputs data and includes an input device such as a keyboard, a pointing device such as a mouse, and a numeric keypad.
The display unit 34 includes a display device such as a liquid crystal panel.
The communication unit 35 is a communication interface that mediates communication via a network or the like, and performs communication with other devices.
The bus 36 is a path that mediates transmission / reception of control signals, data signals, and the like between the respective units.

  The sensors 5a to 5c detect the marker 111 on the surface of the guide roll 10. In the present embodiment, the sensors 5a to 5c are reflective photoelectric sensors, and a fiber sensor having a spot diameter of 100 μm is used.

  The sensors 5a to 5c output the ON signal when the marker 111 is detected, and output the OFF signal as an output signal to the measuring device 3 when the marker 111 is not detected.

(2. Marker 111)
FIG. 3 is a diagram for explaining the marker 111 on the guide roll 10, in which the guide roll 10 is developed in the rotation direction. An arrow A indicates a rotation direction of the guide roll 10 (hereinafter referred to as a roll rotation direction), and a direction perpendicular to the rotation direction is a rotation axis direction of the guide roll 10. The rotation axis direction of the guide roll 10 corresponds to the vertical direction in FIG. 3, and FIG. 3 shows the end of the guide roll 10 in which the marker 111 is provided in the rotation axis direction.

  In the present embodiment, the rectangular markers 111 are provided in three rows in the direction of the rotation axis of the guide roll 10. Hereinafter, the row of the markers 111 is referred to as marker rows 11a to 11c. Three sensors 5a to 5c are arranged side by side in the direction of the rotation axis of the guide roll 10 so as to detect the markers 111 of the marker rows 11a to 11c, respectively.

  In each of the marker rows 11a to 11c, a plurality of markers 111 having the same line width are provided along the roll rotation direction. The line width of the marker 111 refers to the length in the roll rotation direction.

  Moreover, in each marker row | line | column 11a-11c, the space | interval (pitch) between the front-end | tips of the marker 111 in the roll rotation direction is constant. Let this pitch be P. The line width of the marker 111 is P / 2.

  Here, the phases of the marker rows 11a to 11c are shifted by P / 3. That is, the position of the marker 111 in the roll rotation direction is shifted by P / 3 in each of the marker rows 11a to 11c. For example, between two adjacent marker rows 11a and 11b, the position of the marker 111 in the roll rotation direction is shifted by P / 3, and a part thereof overlaps in the roll rotation direction. The same relationship holds for the markers 111 in the marker rows 11b and 11c and the markers 111 in the marker rows 11c and 11a.

  In the present embodiment, the marker 111 is formed by printing with a laser printer. Further, in each of the marker rows 11a to 11c, the line width of the marker 111 is 140 μm and the pitch P is 280 μm. However, the formation method, line width, and pitch of the marker 111 are not limited to this. The shape of the marker 111 is not limited to a rectangular shape.

(3. Measuring method of peripheral speed)
Next, a method for measuring the peripheral speed of the guide roll 10 by the measurement system 1 will be described with reference to FIG. FIG. 4 is a flowchart showing the measurement method.

  In the present embodiment, the sensors 5a to 5c detect the markers 111 of the marker rows 11a to 11c, respectively, during conveyance of the conveyed product 20 by the guide roll 10 (S1). As described above, the sensors 5a to 5c output the ON signal to the measuring device 3 when the markers 111 of the marker rows 11a to 11c are detected, and the OFF signal to the measuring device 3 when the markers 111 are not detected. Output.

  Based on these output signals, the measuring device 3 calculates the peripheral speed of the guide roll 10 from the shift in detection timing of the markers 111 in the marker rows 11a to 11c and the shift in position of the markers 111 (S2).

  FIG. 5A is a diagram showing transition of ON / OFF signals of the sensors 5a to 5c with the horizontal axis as time. As described above, the position of the marker 111 is shifted by P / 3 in each of the marker rows 11a to 11c, and the ON signals of the sensors 5a to 5c are generated with a delay of Δt corresponding to the position shift.

That is, after the sensor 111 detects the marker 111 of the marker row 11a, the sensor 5b detects the marker 111 of the marker row 11b after Δt. The control unit 31 of the measuring device 3 uses the positional deviation P / 3 of the marker 111 between the marker rows 11a and 11b and the timing deviation Δt at which the sensors 5a and 5b detect the marker 111 of the marker rows 11a and 11b. The peripheral speed V of the guide roll 10 during this period can be calculated by the following equation (1).
V = (P / 3) / Δt… (1)

  In the example of FIG. 5A, after the sensor 5b detects the marker 111 of the marker row 11b, the sensor 5c detects the marker 111 of the marker row 11c after Δt, and further after Δt, the sensor 5a detects the marker 111 of the marker row 11a. Is detected. The measuring device 3 calculates the peripheral speed of the guide roll 10 during this time using the equation (1) in the same manner as described above. With the above as one cycle, the detection of the marker 111 by the sensors 5a to 5c and the calculation of the peripheral speed by the measuring device 3 are repeated.

  In this embodiment, the peripheral speed at a distance P / 3 shorter than the line width P / 2 of the marker 111 can be calculated, and the time resolution can be improved to realize a time resolution of about 100 μsec. Further, by detecting the three rows of markers 111 whose positions are shifted by P / 3 by the sensors 5a to 5c, the peripheral speed of the guide roll 10 can be continuously measured without interruption with the above time resolution.

  FIG. 5B is a graph similar to FIG. 5A, and shows a situation in which the guide roll 10 slips at time T1. Slip is a phenomenon in which the conveyed product 20 slides on the guide roll 10, and the peripheral speed of the guide roll 10 that has been rotated due to friction with the conveyed product 20 decreases. Therefore, in the example of the figure, the detection timing deviation Δt ′ of the sensors 5a and 5b is larger than the normal deviation Δt, and the peripheral speed V ′ = (P / 3) calculated by the equation (1). ) / Δt ′ is lower than the normal value V.

  The time change of the circumferential speed of the guide roll 10 measured in this way is stored in the storage unit 32 or the like of the measuring device 3 and can be displayed on the display unit 34 or the like. The operator can check when the slip has occurred by checking the change in the peripheral speed of the guide roll 10 with time. It is also possible to automatically determine whether or not a slip has occurred, for example, by comparing the peripheral speed of the guide roll 10 with a predetermined threshold by the control unit 31 of the measuring device 3. If it is determined, it is possible to issue an alarm with an alarm device (not shown) such as a lamp or a buzzer.

  Further, by comparing the transport start time of the transported object 20 and the time change of the peripheral speed of the guide roll 10, it is possible to determine at which position on the transported object 20 the slip of the guide roll 10 has occurred. It also leads to investigation of the cause of defects.

  As described above, in this embodiment, a plurality of rows of markers 111 whose positions are shifted in the roll rotation direction are detected by the sensors 5a to 5c, respectively, and the detection timing shift of the markers 111 by the sensors 5a to 5c and the markers 111 are detected. By calculating the peripheral speed from the position shift, the peripheral speed at a distance shorter than the line width of the marker 111 can be measured. Therefore, the peripheral speed can be measured with a time resolution finer than the time resolution defined by the line width of the marker 111 that can be read by the sensors 5a to 5c.

  Further, by detecting the three rows of markers 111 whose positions are shifted by 1/3 pitch as described above by the sensors 5a to 5c, the peripheral speed of the guide roll 10 can be continuously detected without interruption with the above time resolution. It can be measured.

  The displacement of the position of the marker 111 is not limited to the above, and can be determined according to the number N of columns of the marker 111. For example, as shown in FIG. 6A, when four rows of markers 111 (line width is P / 2) are provided and the markers 111 of the marker rows 11a to 11d are detected by the sensors 5a to 5d, the marker row 11a. The effect similar to the above can be obtained by setting the deviation of the position of the marker 111 of ˜11d to P / 4. FIG. 6B shows an example in which two rows of markers 111 (the line width is larger than P / 2) are provided, and the markers 111 of the marker rows 11a and 11b are detected by the sensors 5a and 5b. , 11b, the position shift of the marker 111 is P / 2. In this way, when the N rows of markers 111 are provided, the position of the markers 111 in the roll rotation direction may be shifted by P / N in each row.

  However, the present invention is not limited to this. For example, in this embodiment, the peripheral speed of the guide roll 10 of the printing press is measured. However, the application target of the present invention is not limited to this, and can be applied to the measurement of the peripheral speed of various rotating bodies. However, in the present embodiment, by measuring the peripheral speed of the guide roll 10 of the printing press by the measurement system 1, it is possible to capture a peripheral speed change that occurs in a short time, such as a slip.

  In the present embodiment, reflective photoelectric sensors are used as the sensors 5a to 5c, but the present invention is not limited to this. For example, if the guide roll 10 is formed of a transparent material, a transmissive sensor can be used, and the wavelength of light used for the sensor and the sensor type are not particularly limited.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

DESCRIPTION OF SYMBOLS 1; Measuring system 3; Measuring apparatus 5a, 5b, 5c, 5d; Sensor 10; Guide roll 11a, 11b, 11c, 11d; Marker row 20;

Claims (6)

A measurement system for measuring the peripheral speed of a rotating body,
Sensors for detecting markers provided in a plurality of rows in the rotation axis direction of the rotating body,
Based on the detection timing of the marker by the sensor, a measuring device that calculates the peripheral speed of the rotating body,
Have
Among the plurality of rows, the two rows of markers are displaced in the rotational direction of the rotating body and partially overlap in the rotational direction,
The measuring device calculates a peripheral speed of the rotating body based on a shift in detection timing of the two rows of markers by the sensor and a shift in the position in the rotation direction of the two rows of markers. Measuring system. In each row, a plurality of the markers are provided along the rotation direction, and the pitch between the tips in the rotation direction is constant,
The measurement system according to claim 1, wherein the position of the marker in the rotation direction is deviated by P / N in each column when the pitch is P and the number of columns is N.   The measurement system according to claim 1, wherein the rotating body is a guide roll of a printing press. A measuring method for measuring the peripheral speed of a rotating body,
Detecting each marker provided in a plurality of rows in the direction of the rotation axis of the rotating body by a sensor;
A step of calculating a peripheral speed of the rotating body based on a detection timing of the marker by the sensor by a measuring device;
Have
Among the plurality of rows, the two rows of markers are displaced in the rotational direction of the rotating body and partially overlap in the rotational direction,
The measuring device calculates a peripheral speed of the rotating body based on a shift in detection timing of the two rows of markers by the sensor and a shift in the position in the rotation direction of the two rows of markers. Measuring method to do. In each row, a plurality of the markers are provided along the rotation direction, and the pitch between the tips in the rotation direction is constant,
5. The measuring method according to claim 4, wherein the position of the marker in the rotation direction is shifted by P / N in each row when the pitch is P and the number of rows is N. 6. The measuring method according to claim 4, wherein the rotating body is a guide roll of a printing press.