JP2568743Y2 - Remaining paper length meter - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a residual command for measuring a remaining paper length of an old roll and outputting a preparation command necessary for performing a splicing operation from an old roll to a new roll by a flying-type automatic paper splicing apparatus. The present invention relates to a paper length meter, and more particularly to an improvement for reducing output of a preparation command due to erroneous measurement.

[0002]

2. Description of the Related Art In a machine for unwinding and using a roll (roll-up web), for example, a rotary printing press, a roll that is currently unwinding (hereinafter, referred to as a "rolling web") is used by using an automatic splicing apparatus.
The old roll. ) Nears the end, the operation of the machine is automatically stopped by a new roll (hereinafter referred to as a new roll) without stopping the operation of the machine, and the operation is continued. The automatic splicing apparatus is roughly classified into two types, a flying type and a stop splicing type.

An outline of a flying type automatic splicing apparatus will be described with reference to an example of the apparatus shown in FIG. FIG. 3 shows an automatic splicing apparatus with two rolls for supplying a web to a rotary printing press (not shown). (1) As shown in FIG. 3 (a), when the old roll 1 at the unwinding position is unwound and near the end, the turret arm 6 is turned by the preparation command as shown in FIG. 3 (b). The new roll 3 is moved to the paper splicing position, and the new roll 3 is rotated by the pre-drive device 7 at this position so that its surface speed becomes the same as the running speed (line speed) of the web 2 being unwound. To accelerate. (2) After the speed becomes the same, a paper splicing command is issued, as shown in FIG.
The cutter unit 8 is operated as shown in FIG.
Adhesive, such as a double-sided tape 4 previously applied to the surface of
Then, the web 2 of the old roll 1 is pressed to adhere to the new roll 3 and the old roll 1 is separated. Thereby, the splicing is completed. (3) After the splicing is completed, the turret arm 6 is further rotated to move the roll 3 to the unwinding position. In this state, the separated roll 1 is removed from the reel shaft, and instead, the next splicing is performed. For this purpose, a new roll 5 is loaded as shown in FIG. In FIG. 3, reference numeral 9 denotes a floor.

As can be seen from the above description, the turning of the turret arm 6, the acceleration of the new roll 3, and the operation of the cutter unit 8 each take time.
A preparation command must be issued a certain preparation time T ₀ (for example, about one minute) before the completion of the preparation command. For this reason, the remaining paper length meter constantly monitors the remaining paper length of the old roll 1 and calculates how many minutes of remaining paper need to be spliced when unwinding at the current web running speed, and the remaining time T becomes the preparation time T _0. Outputs a preparation command when:

FIG. 4 shows a configuration of a conventional remaining paper length meter. In FIG. 4, the remaining paper length meter includes a one-rotation sensor 11, a major roll 12, an encoder 13, and a CPU (central processing unit) 14. The one-rotation sensor 11 detects one rotation of the roll, and is attached to a reel shaft of the automatic paper splicing device, and outputs one pulse A per one rotation of the roll. The measure roll 12 and the encoder 13 measure the feed amount of the web 2. The measure roll 12 comes into contact with the web 2 unwound from the roll, such as a guide roller or a nip roller, and has the same surface speed as the web traveling speed. Rotated by The encoder 13 detects the amount of rotation of the major roll 12, and outputs one pulse B for each unit rotation angle of the major roll 12. Therefore, one pulse from the encoder 13 corresponds to the unit feed length of the web 2. The CPU 14 outputs a pulse A output from the one-rotation sensor 11 and a pulse B output from the encoder 13.
To perform the following arithmetic processing (1) to (5). (1) The counting of the number of pulses from the encoder 13 is started by the detection of one rotation of the roll 1, the counting is stopped by the detection of the next rotation, and the web feed length of one rotation of the roll is obtained. The diameter of the roll 1 is calculated by dividing by the circumference π. (2) The diameter calculation processing of the above (1) is performed every time one rotation of the roll is detected, and the thickness of the web 2 is calculated from the decrease in the diameter. (3) The remaining paper length of the roll 1 is calculated from the paper thickness and the diameter. (4) The remaining paper length is calculated by dividing the remaining paper length by the current web running speed to reach the final roll or an arbitrary diameter when unwinding, that is, the remaining time T. (5) The remaining time T is compared with a predetermined preparation time T ₀ ,
When the time is less than the preparation time, a preparation command is output.

[0006]

In the above-described conventional remaining paper length meter, the roundness of the roll is good at the center portion, but the thicker the roll, the more eccentricity and distortion are out of the true circle, and the winding tension and Since the unwinding tension fluctuates, when the unrolling of the large-diameter roll is started, the measured value of the diameter is greatly changed every rotation of the roll, and it may be erroneously measured that the paper thickness is large. As a result, a preparation command may be erroneously output in spite of the fact that the remaining time is sufficiently long.
As shown by the broken line in (b), the old roll 1 turns while keeping the large diameter, and may hit the floor 9 to cause an accident.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a remaining paper length meter which solves the above-mentioned problems of the prior art.

[0008]

According to the present invention, there is provided a remaining paper length meter for detecting one rotation of a roll, and detecting a feed amount of a web unwound from the roll. The feed length for each rotation of the roll is obtained from the output signals of the detector, the one-rotation detector and the feed amount detector, the roll diameter is obtained from the feed length, the paper thickness is obtained from the decrease in the roll diameter, and the paper thickness and roll diameter are obtained. A calculating device for calculating the remaining time of the roll from the web running speed and the predetermined roll diameter, a roll diameter measuring device for measuring the roll diameter separately from the calculating device, and comparing the measured value of the roll diameter measuring device with a predetermined value. A first comparator;
The remaining time is compared with the specified time.If the measured value of the roll diameter measuring instrument is less than the specified value, the preparation command is output if the measured value is less than the specified value. A second comparator for instructing the apparatus to perform re-measurement. Needless to say, the predetermined roll diameter includes the diameter of the roll shaft supporting the roll.

[0009]

When the roll diameter is somewhat large, the preparation command should not be output. Therefore, even if the paper thickness is erroneously measured by the arithmetic unit, the validity is determined based on whether or not the measured value of the roll diameter measuring device is equal to or larger than a predetermined value. Therefore, by setting this predetermined value larger than the roll diameter determined by the maximum paper thickness, the maximum running speed, and the preparation time of the web to be used within a range where the roll does not hit the floor when turning, a preparation command is output. In this case, the splicing can be performed without the roll hitting the floor. The measurement accuracy of the roll diameter measuring device does not need to be so high because the purpose is to judge validity.

[0010]

1 and 2, an embodiment of the present invention will be described. FIG. 1 shows a configuration example of the remaining sheet length meter, and FIG. 2 shows an operation flow.

In FIG. 1, a remaining paper length meter includes a one-rotation sensor 11, a measure roll 12, an encoder 13,
It comprises a PU (central processing unit) 14 and a distance measuring sensor 15. The CPU 14 implements an arithmetic unit 16, a first comparator 17, and a second comparator 18, and a converter 1 for converting the output of the distance measuring sensor 15 into a roll diameter.
9 is realized. The arithmetic unit 16 includes a counter unit 2
0, a roll diameter calculator 21, a paper thickness calculator 22, and a remaining time calculator 23.

The one-rotation sensor 11 is the same as the conventional one,
Is attached to the reel shaft of the automatic paper splicer, and outputs one pulse A for each rotation of the roll. Measure roll 12 and rotary encoder 1
Numeral 3 is for detecting the feed amount of the web 2, and the measure roll 12 is a guide roller, a nip roller or the like which is brought into contact with the web 2 unwound from the roll 1 and rotated at the same surface speed as the web running speed. The encoder 13 detects the amount of rotation of the major roll 12, and outputs one pulse B for each unit rotation angle of the major roll 12.
Therefore, one pulse from the encoder 13 corresponds to the unit feed length of the web 2.

The distance measuring sensor 15 and the converter 19 constitute a roll diameter measuring device, and the distance measuring sensor 15 uses ultrasonic waves or light (laser).
Is used to measure the distance L1 to the surface of the roll 1, and the distance L1 between the distance measuring sensor 15 and the center of the roll 1 is measured.
2 is known, d1 = 2 (L
By performing the calculation of 2-L1), the roll diameter d1 is measured. To measure the roll diameter d1,
Since no accuracy is required, any device such as a touch roll type measuring device may be used. The first comparator 17 calculates the roll diameter measured value d1.
Is constantly compared with a predetermined value d0 to monitor whether d1 ≧ d0. The predetermined value d0 is set by a switch operation of the setting unit 24, and is determined by a maximum paper thickness, a maximum traveling speed, and a preparation time of a web to be used within a range where the roll 1 does not hit the floor (see reference numeral 9 in FIG. 3) when the roll 1 turns. Choose a value larger than the determined roll diameter. As an example, in the case of a roll used in a rotary printing machine, considering that it is new and has a diameter of about 1000 mm, if d0 = 600 mm, it does not hit the floor at the time of flying-type automatic paper splicing. In the range of paper thickness and web running speed, sufficient time for splicing.

The arithmetic unit 16 calculates the remaining time T of the roll 1 by using the pulse A from the one-rotation sensor 11 and the pulse B from the encoder 13. , The paper thickness calculation unit 22 and the remaining time calculation unit 23.

The counter unit 20 receives a pulse B from the encoder 13 every time a pulse A is input from the one-rotation sensor 11.
, The counting is stopped by the input of the next pulse A, and the web feed length N for each rotation of the roll is counted.

When the count value N of the counter section 20 is divided by the pi, the roll diameter at that time can be obtained. However, in order to eliminate the influence of the diameter variation due to the tension, eccentricity, distortion, winding condition, etc. of the roll 1, the roll diameter is The calculation unit 21 calculates the roll diameter D by taking the average of the count values N _j (j = 1 to 8) of the eight rolls excluding the maximum value and the minimum value.

[0017] The paper thickness value D _i and the previous value D of the roll diameter
_Since the paper thickness is thin, for example, on the order of 10 μm, the paper thickness calculator 22 calculates the roll 40 rotations from the current value _Di and the value _Di-5 five times before each time the roll diameter is calculated. The average paper thickness t per minute is calculated. For example, the following approximate expression is used. _{t = (D i-5 -D} i) / (2 × 40) or ^{_{t = (D i-5 2}} -D i 2) π / (4 × web travel length of the roll 40 rotations)

The remaining time calculator 23 calculates the remaining paper length from the current roll diameter _Di to the predetermined roll diameter D ₀ every time the paper thickness t is calculated, and further calculates the remaining time T using the web running speed V. It shall be calculated. For example, the following approximate expression is used. T = π (D _i ² −D ₀ ² ) / (4 × t × V) The predetermined roll diameter D ₀ is set by a switch operation of the setting unit 25, and this value D ₀ is determined by the cutter unit (FIG. 3). (See reference numeral 8). Further, the web running speed V may be set by the setting device 26, or may be an actually measured value using the cycle of the output pulse B of the encoder 13.

Each time the remaining time T is calculated, the second comparator 18 compares the remaining time T with a predetermined preparation time T ₀ set by the setting unit 27. Then, when T ≦ T _0, a preparation command 28 is output only when the comparison result of the first comparator 17 is d 1 ≦ d 0, and when d 1 ｄd 0, a reset command 29 is given to the arithmetic unit 16 to perform re-measurement. Is performed. This reset command 29
As a result, the arithmetic unit 16 must have an error in the paper thickness t used in the calculation so far, and the data N, D, t, T
, And start the measurement again.

FIG. 2 is a flowchart showing the operation of the remaining paper length meter according to the above-described embodiment.

The predetermined diameter D of the roll in the above embodiment
Needless to say, ₀ may be the diameter of the roll shaft supporting the roll.

[0022]

[Effect of the Invention] The remaining paper length meter of the present invention compares the measured value of the roll diameter measuring device with a predetermined value to judge the validity of the remaining time measurement. Even if there is an erroneous measurement of the paper thickness due to deformation or the like, it is possible to prevent erroneous output of the preparation command due to this.

[Brief description of the drawings]

FIG. 1 is a block diagram of a remaining paper length meter according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is an explanatory view of a flying type automatic paper splicing apparatus.

FIG. 4 is a block diagram of a conventional remaining paper length meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Old roll 2 Web 3, 5 New roll 4 Adhesive material 6 Turret arm 7 Predrive device 8 Cutter unit 9 Floor 11 1 Rotation sensor 12 Measure roll 13 Encoder 14 CPU 15 Distance measuring sensor 16 Computing device 17 First comparator 18 Second comparator 19 Converter 20 Counter unit 21 Roll diameter calculation unit 22 Paper thickness calculation unit 23 Remaining time calculation unit 24, 25, 26, 27 Setting unit 28 Preparation command 29 Reset command

Claims (1)

(57) [Scope of request for utility model registration] 1. A one-rotation detector for detecting one rotation of a roll, a feed amount detector for detecting a feed amount of a web unwound from the roll, and a roll from output signals of the one-rotation detector and the feed amount detector. An arithmetic unit that calculates the feed length for each rotation, obtains the roll diameter from this feed length, obtains the paper thickness from the decrease in the roll diameter, and obtains the remaining time of the roll from the paper thickness, roll diameter, web running speed, and predetermined roll diameter. A roll diameter measuring device that measures the roll diameter separately from the arithmetic device, a first comparator that compares a measured value of the roll diameter measuring device with a predetermined value,
The remaining time is compared with the specified time.If the measured value of the roll diameter measuring instrument is less than the specified value, the preparation command is output if the measured value is less than the specified value. And a second comparator for instructing the apparatus to perform re-measurement.