JPH059345B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention measures the amount of web remaining on an unwinding roll when feeding a web such as paper or film wound into a roll, and issues a necessary alarm if necessary. Concerning how to emit.

BACKGROUND ART Conventionally, the amount of web remaining on an unwinding roll has been measured by measuring the diameter of the unwinding roll. For example, since the diameter of the winding core is known in advance, the alarm generation roll diameter (slightly larger than the diameter of the winding core) can be set appropriately based on the diameter of the winding core, and the diameter of the unwinding roll can be set appropriately. The web is fed while being measured, and when the roll diameter falls below the set roll diameter, a warning signal indicating that the amount of remaining web is running low is issued and the machine is stopped.

Problems with the Prior Art As described above, in the control based on the diameter of the unwinding roll, the actual remaining length naturally changes depending on the thickness of the web. For example, the thickness of the web
In the case of 0.1 mm and in the case of 0.01 mm, if the same core is used, the actual remaining web length will be 10 times longer in the latter case with the same roll diameter. Therefore, if the alarm generation roll diameter is set to be the same in the automatic paper feeder, and the machine is stopped and the subsequent web is glued, a large amount of paper will be left behind for thin webs, resulting in waste. On the other hand, if the web is thick, the paper feeding timing may be lost and gluing may not be possible.

Therefore, in order to avoid this, the setting of the alarm roll diameter must be changed or corrected depending on the web thickness. However, this work is often forgotten because it has to be done in the midst of complicated work. This has led to a tendency to set the alarm roll diameter for the thickest web to avoid situations where gluing cannot occur even if the setting is forgotten, and this is a cause of waste. It's summery.

Purpose of the Invention The purpose of the present invention is to solve the problems in the prior art by automatically calculating the thickness of the web and calculating and monitoring the remaining length of the web on the unwinding roll. However, it is an object of the present invention to provide a control method that issues warnings and signals such as a remaining amount warning based on the remaining length of the web, a remaining working time warning, or a deceleration start timing signal for stopping the machine.

SUMMARY OF THE INVENTION For this purpose, the present invention provides a first pulse generator combined with a measuring roll for measuring the running length of a web, and a second pulse generator for measuring the rotational speed of an unwinding roll. and a data setting unit for setting the initial diameter of the web unwinding roll, the core diameter, the amount of web remaining on the unwinding roll at the end of unwinding, or the remaining working time setting value, and/or the deceleration program for stopping; and a controller configured to include an arithmetic/control unit that inputs and processes the outputs of both pulse generators, and the controller outputs both input pulses during a certain number of revolutions of the unwinding roll after the start of operation. The cross-sectional area of the unwind roll and the running length of the web are calculated based on the number and the diameter of the measuring roll, and the thickness of the web is calculated based on these. The above remaining web length is calculated and compared with the remaining web length setting value set by the data setting section, and the required alarm/signal related to machine stop is generated based on the comparative monitoring of the remaining web length. It is characterized by the following.

Embodiment FIG. 1 shows an overall schematic configuration of an apparatus for carrying out a control method in web feeding according to the present invention. As shown here, this device includes a measuring roll 1 for measuring the traveling length of the web w, a first pulse generator 2 that is combined with the measuring roll 1 to generate pulses, and an unwinding device. It includes a second pulse generator 3 for detecting rotation of the roll 4 and a controller 5. The present invention is particularly characterized by the arithmetic processing performed by the controller 5, and the principle thereof will be explained below.

As shown in FIG. 1, the diameter of the measuring roll 1 is D _n ,
The diameter of the unwinding roll 4 is D _r , the number of pulses generated by the first pulse generator 2 per revolution of the measuring roll 1 is P, and the number of pulses generated by the first pulse generator 2 when the unwinding roll 4 makes n revolutions is If the number of pulses generated is P _o , the diameter D _r of the unwinding roll 4 is generally calculated using the formula (1)
It can be found by

D _r =D _n・P _o /P・n (1) Here, D _n is a constant value that can be known in advance, and similarly the predetermined number of pulses P, the number of rotations n to be counted, and the number of pulses P _o Based on this, the diameter D _r can be constantly monitored.

By the way, in the present invention, the fed web w
The main feature is that the thickness is determined through calculation processing. For this purpose, in the present invention, the thickness of the web w is calculated from the start of the web feeding operation until the unwinding roll 4 rotates at an appropriate number of revolutions, for example, until it completes n1 revolutions. The principle of this calculation is as follows. That is, as shown in FIG. 2, the initial diameter of the unwinding roll 4 is D1, the diameter of the unwinding roll 4 after n1 rotations is D2, and the length of the web w fed during this period. If the thickness is l _o , the thickness t of the web w can be determined by equation (2).

t=π(D1 ² −D2 ² )/4/l _o (2) Here, the initial diameter D1 is a value that can be known in advance,
Since D2 is a value that can be constantly monitored by calculation as shown in the above equation (1), the thickness t can be calculated by measuring the web feeding length _lo .

The feeding length l _o of this web can be easily determined as follows. That is, since the fed web w rotates n1 times from the state where the initial diameter of the unwinding roll 4 is D1, it rotates the measuring roll 1, so that the first pulse generator 2 that cooperates with this measuring roll 1 If the total number of output pulses is P _t , then _lo can be determined using equation (3).

l _o = π・D _n /P×P _t (3) In this way, the thickness t of the web w can be calculated during the first appropriate rotation of the unwinding roll 4, for example, n1 rotations. be.

On the other hand, as the web w is being fed, the unwinding roll 4
diameter gradually decreases. Therefore, if the diameter of the unwinding roll 4 at a certain point is D _x , then the web w at that time is
Let l _x be the remaining length of , then l _x can be found from equation (4).

l _x = π(D _x ² - D _c ² /4/t (4) Here, D _c is the winding core diameter (see Figure 2). Therefore,
By monitoring this remaining length _l It can be achieved.

Further, the feeding speed can be determined from the interval between pulses generated by the first pulse generator 2, and can be determined, for example, by measuring the internal clock of the controller 5, which has a stable frequency. Therefore, assuming that the feeding speed of the web w is S, the remaining working time (for example, the time until a warning for the remaining amount of web is issued) T _x can be determined by equation (5).

T _x = l _x /S = l _x・CL _o・P/π・D _n (5) Here, CL _o is the number of pulse intervals output from the first pulse generator 2 counted by the clock. Therefore, , for example, the remaining length l _x determined by equation (4)
If the controller 5 is configured to output an alarm signal to the outside when _l Regardless of the length, the machine can always be stopped in a state where the remaining length is the same, that is, in a desirable state. Also, the remaining working time
A similar setting can be made to issue an alarm signal regarding T _x .

Furthermore, the remaining working time T _x can be obtained by
By inputting the deceleration gradient at stop that is unique to the machine, it is also possible to create a deceleration start timing signal so as to stop the machine at the optimum remaining length of the web. This can be done, for example, by outputting a deceleration start timing signal when formula (6) is satisfied while measuring the feeding speed S of the web w.

S/V _MAX ×T _M ≧T _x (6) (Here, V _MAX is the maximum line speed, and T _M is the time required for the machine to stop from the maximum speed, which is set by the controller.) As described above, In the present invention, the thickness of the web w is automatically calculated, and based on this, the remaining amount of the web w on the unwinding roll 4 is calculated and monitored. Therefore, various desired alarms and signals can be generated.
Further, it will be understood that the feature is that this allows the machine to be stopped while always leaving a predetermined length of remaining amount on the unwinding roll 4.

FIG. 3 shows the configuration of the controller 5 as an example for performing such calculations. Here, the gate 10 controls the number of pulses for using the pulse signal from the first pulse generator 2 to calculate the thickness of the web w and the diameter of the unwinding roll 4. The gate 11 controls the number of clocks for measuring the feeding speed of the web w. Counter 12 counts the pulses from gates 10 and 11 and outputs it to arithmetic and control unit 13. The clock 14 measures the feeding speed of the web w and the arithmetic/control unit 13.
Used for basic timing signals. The calculation/control unit 13 performs various calculations as described above, and also controls input/output. Outputs include alarm outputs for remaining length and remaining working time, as well as remaining length, unwinding roll diameter, web thickness, remaining working time, etc. Furthermore, data similar to the output can be displayed. Furthermore,
The data setting section, that is, the data set, includes various data used for calculations, such as data on the remaining amount and time for issuing an alarm, the diameter of the measuring roll 1, and the number of times per rotation of the measuring roll 1. The number of pulses generated by one pulse generator 2, the core diameter of the unwinding roll 4, etc. are included.

In any case, in the present invention, the controller 5 is configured to perform various calculations based on the above-mentioned six formulas and thereby perform control based on the remaining amount length. It is not necessary to equip the system with particularly complex measuring equipment. Furthermore, the arithmetic expression itself can be changed, and the configuration of the controller 5 is not limited to the illustrated embodiment.

Effects of the Invention Instead of monitoring the remaining amount by measuring the diameter of the unwinding roll in the past, the web thickness can be measured by oneself, the remaining amount can be calculated, and the remaining amount can be managed as a length, regardless of the web thickness. Waste due to remaining amount can be reduced as much as possible. Furthermore, when changing the web thickness, it is possible to be freed from the trouble of changing data settings such as alarm generation timing. The configuration equipment for this purpose is not particularly different from the conventional one, and the main difference is in the processing content, so
Can be easily applied to existing equipment. Not only the remaining amount,
You can also easily get alerts about remaining work time.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the overall structure of an apparatus for carrying out a control method in web feeding according to the present invention. FIG. 2 is a schematic explanatory diagram for explaining the principle of calculation that is a feature of the present invention. FIG. 3 is a schematic configuration diagram showing an embodiment of the configuration of the controller. w...web, _Dc ...core diameter, _Dn ...diameter of the measuring roll, _Dr ...diameter of the unwinding roll, D1...
Initial diameter of the unwinding roll, D2...Diameter of the unwinding roll after n1 rotations, P, P _o ...Number of pulses generated by the first pulse generator, 1...Measuring roll, 2...
...first pulse generator, 3...second pulse generator, 4...unwinding roll, 5...controller.

Claims (1)

[Claims] 1. A first pulse generator combined with a measuring roll for measuring the running length of the web, a second pulse generator for measuring the rotational speed of the unwinding roll, and a first pulse generator combined with the measuring roll for measuring the running length of the web; The initial diameter of the unwinding roll, the core diameter, the amount of web remaining on the unwinding roll at the end of unwinding, or the remaining working time setting value, and/or the data setting for setting the deceleration program for stopping, and the generation of both of the above-mentioned pulses. and a controller configured to include an arithmetic/control unit that inputs and processes the output of the machine, and the controller measures the number of input pulses and the number of pulses during a certain number of revolutions of the unwinding roll after the start of operation. The cross-sectional area of the unwind roll and the running length of the web are calculated based on the diameter of the roll, and the thickness of the web is calculated based on these. During the subsequent rotation of the unwind roll, the web on the unwind roll is A control method for web feeding, characterized in that the remaining web length is calculated and monitored, and necessary alarms and signals related to web feeding are generated based on this remaining web length.