JPH03249053A - Roll diameter computing device - Google Patents

Abstract

PURPOSE:To perform independent detection of the diameter of a roll by providing a distance measuring device, a roll diameter computer for converting into the roll diameter the length detected by the distance measuring device, and an average operational unit for averaging the roll diameter in one cycle of rotation of the roll detected by a rotation number detecting device. CONSTITUTION:A roll diameter computing unit is equipped with a distance measuring device 5, a pulse generator 3 for detecting the rotation number of the diameter of a roll, a rotation number calculator 4, a roll diameter computer 6 for converting into the roll diameter the length of a sheet detected by the distance measuring device 5, and an average operational unit 7 for averaging the roll diameter in one cycle of rotation of the roll detected by the rotation number detecting device 4. The present roll surface position is measured by the distance detector 5 and is subtracted from the distance L between the respective centers of the distance detector 5 and a feed roller 2 so that the present feed roll diameter is calculated. When the roll is eccentric, however, the roll diameter is fluctuated and so data on the roll diameter is averaged by the average operational unit 7 so as to prevent nonconformities.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a roll diameter calculating device for a feed-out/wind-up machine that feeds out or winds up a sheet material such as a paper or a film.

(Prior art) Conventionally, when feeding out paper or film, the diameter of the feeding roll is adjusted in order to control the tension of the feeding shaft and the surface speed in order to keep the tension of the sheet material constant. is calculating.

Here, as an example of calculating the diameter of the delivery roll, a delivery roll diameter calculation device is used that calculates the delivery diameter from the ratio of the number of revolutions of the delivery roll and the number of revolutions of the pass roll. That is, the rotation of the feed roll is detected by a pulse transmitter and the rotation speed is detected by a rotation speed calculator, and at the same time, the rotation of the pass roll is detected by a pulse transmitter and the rotation speed is detected by a rotation speed calculator. Input the rotation speed into the roll diameter calculator and calculate the roll diameter from the ratio of rotation speeds.

As an example of the calculation method, the calculation formula is described below.

D= Umbrella PP 2w Pw: Delivery roll rotation speed PP: Pass roll rotation number K: Arithmetic constant D: Delivery roll diameter (problem to be solved by the invention) However, in such a device, the difference between the pass roll and the sheet material If slip occurs, the ratio of rotational speeds will be out of order, so the calculated delivery roll diameter will differ from the actual roll diameter. Furthermore, if there is tension or slack between the delivery device and the delivery length calculation roll, the diameter of the delivery roll will differ.

As a result, the tension on the feeding machine side was distorted, resulting in defective products.

Although the above-mentioned problem has been explained using an arithmetic device that calculates based on the rotational speed ratio of the roll, it is also the same with other arithmetic methods that use bus rolls, such as a method that calculates based on the delivery length.

A similar problem also occurs in the take-up roll diameter detection device.

[Structure of the Invention] (Means for Solving the 11 Problems) The present invention provides a roll for feeding or rewinding a sheet material,
A distance detector that detects the distance to the surface position of the roll, a pulse transmitter that detects the rotation speed of the roll, a rotation multiple calculator that is connected to this pulse transmitter to calculate the rotation speed, and a distance detector. A roll diameter calculation device that converts the length detected by the roll diameter calculation device into a roll diameter, and an average calculation device that averages the roll diameter over one rotation based on the output signal of the roll diameter calculation device and the output of the rotation speed calculator. This is a roll diameter calculation device.

(Function) The present invention includes a distance measurement device, a roll diameter calculation device that converts the length detected by the distance measurement device into a roll diameter, and a roll diameter calculated by the period of one roll rotation detected by the rotation speed detection device. Equipped with an averaging calculation device that performs averaging, and performs independent roll diameter detection that is not affected by delivery length or other factors, suppressing the impact on the product.

(Example) Next, an example of the present invention will be described. Figure 1 shows sheet material 1
a distance detector 5 that detects the distance to the surface position of the roll 2; a pulse transmitter 3 that detects the number of rotations of the roll 2; A rotation speed calculator 4 that calculates the number, a roll diameter calculation device 6 that converts the length detected by the distance detector 5 into a roll diameter, and an output signal of the roll diameter calculation device 6 and an output of the rotation speed calculator 4. This figure shows a roll diameter calculation device comprising an average calculation device 7 that averages the roll diameter over one rotation.

That is, a distance measuring device 5, a pulse transmitter 3 that detects the rotation speed of the roll diameter, a rotation speed calculator 4, and a roll diameter calculation device 6 that converts the length detected by the distance measurement device 2 into a roll diameter. The configuration includes an average calculation device 7 that averages the roll diameter at the cycle of one rotation of the roll detected by the rotation speed detection device 4.

The current diameter of the delivery roll can be calculated by measuring the current roll surface position with the distance detector 5 and subtracting it from the distance between the distance detector 5 and the center of the delivery roll.

An example of the roll diameter calculation method is shown below.

D = 2 skewers (L Lx) L: Distance between the distance detector 5 and the center of the roll Lx: Distance to the roll surface measured with the distance detector D 2 Roll diameter However, if the roll is eccentric or the winding shape is not good In this case, the roll diameter output from the roll diameter calculating device 6 changes.

Therefore, problems can be prevented by averaging the roll diameter data for each roll diameter rotation using an averaging device.

An example of a method for averaging is shown below.

Integrate the instantaneous roll diameter calculated for each calculation period of the roll diameter calculation device 6, and calculate the integrated roll diameter data by the number of calculations n of the roll diameter calculation device 6 during one rotation period calculated by the rotation speed calculator 4. By dividing, find the average roll diameter during one rotation.

The formula for the calculation method is shown below.

Σ D DAVB = n I) AVt! : Averaged roll diameter D. Instantaneous roll diameter n calculated by the roll diameter calculating device. Figure 2 shows the change in roll diameter before averaging the number of integrations during one roll rotation. Fig. 3 shows a graph of changes in roll diameter when the roll diameter is changed.

As described above, by performing averaging, a stable delivery roll diameter can be obtained.

Furthermore, since there is no need to measure the delivery length, the delivery device can be made completely independent, so the present invention can be applied even to structures where it is not possible to attach a delivery length measuring device.

〔Effect of the invention〕

As explained above, according to the present invention, the deviation in the delivery length due to tension or slack between the delivery length measuring device and the delivery length measuring device can be prevented.
Not affected by other factors.

The roll diameter can be detected independently, reducing the impact on the product.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a roll diameter calculation device showing an embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams showing changes in roll diameter. 3... Pulse transmitter 4... Rotation speed calculator 5.
・・Distance detector 6・Roll diameter calculation device 7・
・Averaging device

Claims (1)

[Claims] A roll for feeding or rewinding the sheet material, a distance detector for detecting the distance to the surface position of the roll, a pulse transmitter for detecting the rotation speed of the roll, and a pulse transmitter connected to the pulse transmitter for detecting the rotation speed. a roll diameter calculation device that converts the length detected by the distance detector into a roll diameter; and a roll diameter calculation device that converts the length detected by the distance detector into a roll diameter, and A roll diameter calculation device comprising: an average calculation device that averages the diameter over one rotation.