JPH04144875A - Winding posture detecting device - Google Patents

Abstract

PURPOSE:To detect a winding posture failure by calculating a roll diameter and the latest average roll diameter from the distance from a determined point on the outside of a roll to the roll surface and the rotating speed of a roll shaft, and generating a signal when the time change ratio of the deviation between both exceeds a set value. CONSTITUTION:A distance detector 5 detects the distance LX from its mounting position to the surface of a roll 2 for one rotation of the roll in a short period of several ten times and gives the resulting distance to a roll diameter arithmetic means 6 to calculate a roll diameter D. If the roll 2 has no winding wrinkle nor eccentricity, the roll diameter will be linearly reduced as shown by a line X. When the roll is eccentric, the diameter D is gradually reduced in a form as shown by a curve Y. The roll diameter data of the means 6 is given to an averaging means 7, and every output of pulse signal from a rotating speed detecting means 4, the roll diameter D data at that point of time is read, and the latest several time data are integrated to determine their average value. This data are added to a differentiating means 8, and a comparing means 9 sounds an alarm device 10 when the output data of the means 8 exceeds an internally set threshold.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention aims to prevent wrinkles and unevenness from occurring during winding of sheet materials such as paper and film around a roll shaft or during unwinding from a roll shaft. The present invention relates to a winding shape detection device for detecting a winding shape defect such as a core.

(Prior art) When wrinkles occur while winding a sheet material around a roll shaft,
Alternatively, if eccentricity occurs during storage as a roll and is detected during unwinding, countermeasures must be taken promptly.

However, in the past, there was no device for detecting defects in winding appearance such as wrinkles and eccentricity, so operators had to visually check for the presence or absence of such defects, and if there were defects in winding appearance, they could be appropriately disposed of.

(Problems to be Solved by the Invention) As described above, the method of visually checking whether there is a defective roll shape is difficult to make an accurate judgment unless the operator is a skilled operator.
In addition, it was extremely difficult to check the film on the photosensitive agent coating line, which requires operation in a dark room.

This invention was made to solve the above-mentioned problems, and its purpose is to provide a roll shape detection device that can easily and reliably detect roll shape defects regardless of the operator's skill level or work environment. shall be.

[Structure of the invention]

(Means for Solving the Problem) The present invention detects the distance from a predetermined point on the outside of the roll to the roll surface at a predetermined period while the sheet material is being wound around the roll shaft or unwinded from the roll shaft. a detection means, a roll diameter calculation means for calculating a roll diameter based on the detected distance, a rotation speed detection means for detecting the rotation speed of the roll shaft, and using the rotation speed of the roll shaft and the roll diameter. an averaging means for calculating the latest average roll diameter; a differentiating means for calculating a time change rate of the deviation between the roll diameter and the average roll diameter; The present invention is characterized by comprising a comparison means for generating a signal indicating a defective appearance.

(Function) In this invention, the distance from a predetermined point on the outside of the roll to the roll surface and the rotation speed of the roll shaft are detected, and the roll diameter and the latest average roll diameter are calculated from the obtained values. When the time rate of change of the deviation between the two exceeds a set value, a signal indicating a defective winding shape is generated, so that a defective winding shape can be detected easily and reliably.

(Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention together with a turret type winding or unwinding machine (hereinafter simply referred to as winding machine) to which the invention is applied.

In the figure, a sheet material 1 is being rewound from one roll 2 of a plurality of winder rolls (hereinafter referred to as rolls) constituting a turret type winder. Among these, a pulse transmitter 3 is coupled to the rotation shaft of the roll 2, and its pulse signal is applied to the rotation speed detection means 4. The rotation speed detection means 4 counts the pulse signals and outputs one pulse signal every time the roll 2 rotates once. Further, a distance detector 5 for detecting the distance from the position to the surface of the roll 2 at a predetermined period is attached to the so-called turret rotation axis that changes the roll position by turning, and the distance data is added to the roll diameter calculation means 6. It will be done. The roll diameter calculating means 6 calculates the roll diameter of the roll 2 at that time using the distance data. The roll diameter data calculated here and the rotation speed detection means 4
The pulse signal outputted from the pulse signal is applied to the averaging means 7.

The averaging means 7 reads the roll diameter data each time the pulse signal from the rotation speed detection means 4 is input, and calculates the average roll diameter by averaging the latest several roll diameter data. This average roll diameter data and the roll diameter data of the roll diameter calculating means 6 are added to a differentiating means 8 equipped with a subtracter. The differentiating means 8 subtracts the roll diameter data from the average roll diameter data, differentiates the deviation with respect to time, outputs time change rate data, and adds the data to the comparing means 9. Comparison means 9 compares this time rate of change data with an internally set threshold value, and when the former is larger, gives an alarm signal to alarm device 10.

Next, the detailed operation of this embodiment will be explained below with reference to FIG.

The sheet material 1 is rewound with a constant tension and at a specified surface speed. Therefore, the diameter of the roll 2 becomes gradually smaller. When the distance detector 5 is installed, it detects the distance L from the position to the surface of the roll 2 at short intervals of several thousand times per roll rotation, and provides distance data to the roll diameter calculation means 6. At this time, the roll diameter calculation means 6 calculates the roll diameter using the following equation.

D-2X (L-L > ... (1) where D = roll diameter calculated by roll diameter calculation means 6: distance L between distance detector 5 and roll center: detected by distance detector 5 This is the distance to the roll surface.

Here, assuming that the roll 2 has no wrinkles or eccentricity, the roll diameter decreases linearly as time passes, as shown by the straight line X in FIG. 2(a). On the other hand, if the roll 2 is eccentric, it gradually becomes smaller in the form of a superimposed sine wave with a small amplitude, as shown by the curve Y in FIG. In this embodiment, in order to detect this change, the roll diameter data from the roll diameter calculation means 6 is fed to the averaging means 7, and each time a pulse signal is output from the rotation speed detection means 4,
Read the roll diameter D data at that time, integrate the latest several times' data, and find the average value. That is, the following equation is calculated.

DAYE■ΣD/n　　　　　　　　...(2) However, DAYE’Average roll diameter calculated by the roll diameter calculation means 6. Roll diameter n: number of integrations It is.

The data of the roll radius and average roll diameter DAvE calculated in this way are applied to the differentiating means 8, where the following equation is calculated.

d(D −D)/dt (3) YE If the roll radius changes as shown by the curve Y in FIG. 2(a), the output data of the differentiating means 8 will be b)
It changes like this.

Therefore, the comparing means 9 compares the output data of the differentiating means 8 with an internally set threshold value, and when the output data exceeds the threshold value, outputs an alarm signal and causes the alarm device IO to sound.

The rotation speed detection means 4 and the roll diameter calculation means 6 described here
, the averaging means 7, the differentiating means 8 and the comparing means 9 are provided in the microcomputer 11.

Thus, according to this embodiment, defects in the winding shape such as wrinkles and eccentricity can be detected.

In the above embodiment, the roll diameter at that point was integrated every time the roll 2 rotated once, but instead, the roll diameter was integrated several times per revolution, and the obtained value was divided by the number of integrations. Even if the average roll diameter DAvE is determined, it is possible to detect a winding defect in a manner similar to that described above.

Further, in the above embodiment, the case where the present invention is applied to a turret type winding machine has been described, but it goes without saying that the present invention can be similarly applied to other winding machines.

Furthermore, in the above embodiment, the microcomputer 11 has the functions of the rotation speed detection means 4, the roll diameter calculation means 6, the averaging means 7, the differentiating means 8, and the comparison means 9, but each function is an independent calculation element. may also be used.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the roll diameter and the latest average roll diameter are calculated based on the detected distance to the roll surface and the rotational speed of the roll shaft, respectively. When the time rate of change of the deviation exceeds a set value, a signal indicating poor winding shape is generated, so that poor winding shape can be easily and reliably detected regardless of the operator's skill level or work environment.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention together with its application target, and Fig. 2 shows the roll diameter, its rate of change with time, and FIG. 2... Roll, 3... Pulse transmitter, 4... Rotation speed detection means, 5... Distance detector, 6... Roll diameter calculation means, 7... Averaging means, 8.・Differential means, 9・
...Comparison means, 10...Alarm device, 11...Microcombi store.

Claims (1)

[Claims] Distance detecting means for detecting the distance from a predetermined point on the outside of the roll to the roll surface at a predetermined period while the sheet material is being wound around the roll shaft or being unwound from the roll shaft; a roll diameter calculation means for calculating the rotation speed of the roll shaft, a rotation speed detection means for detecting the rotation speed of the roll shaft, and an averaging means for calculating the latest average roll diameter using the rotation speed of the roll shaft and the roll diameter; A differentiating means for calculating a time change rate of the deviation between the roll diameter and the average roll diameter, and a comparison means for generating a signal indicating poor roll shape when the calculated time change rate exceeds a set value. A roll shape detection device characterized by the following.