JPS6030264Y2 - Winding diameter detection device - Google Patents

Description

[Detailed description of the invention] The present invention is used to check the current diameter of the web being fed or wound during web feeding or winding operations such as printing machines, and whether or not it has reached a predetermined diameter. The present invention relates to a winding diameter detection device for determining a winding diameter.

In the conventional winding diameter detection method, if the number of revolutions of the winding shaft for paper feeding or winding is N1, the web moving speed is V1, and the winding diameter is D, ■=π
There is a relationship of DN, and the winding diameter is determined by D=■/πN.

The configuration for detecting D=V/frN includes counting a first pulse proportional to the rotational speed N of the winding shaft from a pulse generator attached to the material to be wound, and another pulse proportional to the web moving speed V. Count the second pulse from the generator, count the number of pulses of the other during a period proportional to the cycle of one of the first and second pulses, and calculate the winding diameter from the counted value. I'm looking for it.

However, in order to improve accuracy and detect the winding diameter quickly with this conventional method, it is necessary to increase the number of pulses per time, but a pulse generator that generates many pulses per revolution and has good resolution is expensive. Furthermore, in actual use, since the pulse generator is attached to the mechanical device and the wiring is carried out, it is easily affected by noise and tends to malfunction.

Furthermore, in a multi-arm paper feeding or winding device, since the arms rotate, the signal from the pulse generator attached to the arm is sent via a current collector such as a slip ring, making conditions even worse.

For these reasons, there are naturally restrictions on the frequency of pulses that can be safely used, and there are also limits on accuracy, making it unsatisfactory in terms of performance in the present day when the unit cost of materials has become expensive.

The present invention was developed with these points in mind, and instead of counting the pulses of one pulse during a period proportional to the period of the other, the part that generates the pulses is extremely simple, e.g. one per revolution. A close body that emits two low-frequency pulses is provided to supply accurate and stable pulses.A high-frequency oscillator is installed inside the control device, and the precise time between the pulses is measured digitally.The time is used to determine the winding diameter. The object of the present invention is to provide a winding diameter detection device with a winding diameter display that is highly accurate and highly stable.

The present invention will be described below using an example of a rotary printing press.

FIG. 1 shows the constituent countries of the winding diameter detection device, FIG. 2 shows the block diagram of the present invention, and FIG. 3 shows a time chart.

In FIG. 1, a roll of paper 1 is mounted on a shaft 2 and rotatably supported by a frame (not shown).

3 is a variable speed motor, 4 is a pulley fixed to the variable speed motor 3, and 5 is a drive shaft rotatably supported by a bearing (not shown). A pulley 6 is fixedly installed, and a belt 7 is hung between these pulleys 4 and 6.

8 is an infeed roller rotating via the drive shaft 5; 9
is a presser roller that rotates in contact with the infeed roller 8, and feeds out the web 10 of the web 1 without slipping on the infeed roller 8.

The disk 11 is mechanically connected to the infeed roller 8, and when the infeed roller 8 rotates and the proximity object 12 fixed to the disk 11 passes the proximity switch 13, the proximity switch 13 sends a pulse signal. put out.

A disc 14 is mechanically connected to the shaft 2 that chucks the web 1 and rotates at the same time, and when a proximity body 15 fixed to the disc 14 passes a proximity switch 16, the proximity switch 16 emits a pulse signal. put out.

Here, the moving speed of the web 10 is V1, the diameter of the web 1 is D
l, the diameter of the infeed roller 8 is D2, the rotation speed of the web 1 is N1, the rotation speed of the infeed roller 8 is N2
Then, for roll 1, V=? rD□×N□ ・・・
(1) In the infeed roller, ■=πD2×N2... (
2) If the time per rotation of the web 1 and the infeed roller 8 are each 'qt ''2, then N1 = 1/1iN2 = 1/12 Substituting this into equation (1), (21) ■ = πDIX1/''x ■ = πD2 Therefore, the diameter D1 of roll paper 1 is t□/12
It can be found by multiplying by the constant diameter D2.

For example, the time it takes for the web 1 to rotate once is 100rrLSeC
The time for one infeed roller 8 to rotate once is 1Q7rL
sec, the diameter of infeed roller 8 is 10orIrI
If it is, the diameter of the roll t, 1 (set-up paper 1 is Dt = D2X -100X 1o
-1000mm2.

The oscillation circuit 17 in FIG. 2 is a circuit that uses a crystal oscillator to generate high-frequency clock pulses, and the control circuit 18 separates the pulse signals of the proximity switch 13 and the proximity switch 16, and outputs the pulse signals of the proximity switch 13 and the proximity switch 16, 21
The counter 19 is used to give a start signal to the web 1.
In other words, the clock pulses of the oscillation circuit 17 are counted between the pulses of the proximity switch 16 to obtain the above-mentioned value.

The counter 20 is calculated per revolution of the infeed roller 8.
That is, the clock pulses of the oscillation circuit 17 are counted between the pulses of the proximity switch 13, and the above-mentioned t2 is determined.

The calculation circuit 21 calculates the diameter D1 of the web 1 by dividing the time calculated by the counter 19 by the time calculated by the counter 20 and multiplying by a constant.

The roll diameter setting 22 is for setting the diameter of the roll 1 using a digital value such as a digital switch, and the comparison circuit 23 compares the diameter of the roll 1 calculated by the calculation circuit 21 with the amount set in the roll diameter setting 22. When there is a match, a match signal 24 is output.

The coincidence signal 24 is used as a signal for automatic rewinding since the web 1 has reached a predetermined winding diameter due to the splicing signal from the automatic splicing device.

The roll diameter display 25 displays the diameter of the web 1 calculated by the arithmetic circuit 21 in a digital quantity, so that the diameter of the web 1 can be accurately monitored at all times.

In FIG. 3, the clock a is the clock pulse output from the oscillation circuit 17, the PCB b is the signal pulse of the proximity switch 16, the PGA is the signal pulse of the proximity switch 13, d is the counter 19, and ENABLE is the control circuit 18. The range in which clock pulses are counted by the counter 19 is limited by using the period between the pulses of the proximity switch 16 as a gate.

The counter 20ENABLE of e is configured by the control circuit 18 to limit the range in which the counter 20 counts clock pulses by using the pulse interval of the proximity switch 13 as a gate.

The counter 19 count of f is calculated from the count by the counter 19, the counter 20 count of g is calculated by the count by the counter 20, and the calculation circuit ENABLE of h is calculated by the calculation circuit that calculates the values of the counter 19 and counter 20. 21 is a gate signal for acceptance and calculation.

As explained above, in the present invention, the rotation of the infeed roller 8 that feeds out the web 10 is
2 digitally measures the pitch at which the signal from the proximity switch 13 is output, that is, the time between the pulses, and the rotation of the web 1 is digitally measured by the proximity body 15 of the disk 14 at the pitch at which the signal from the proximity switch 16 is output, that is, the time between the pulses. However, since the diameter of the infeed roller 8 is constant, the diameter of the web 1 can be calculated as described above.

Furthermore, the higher the frequency, the higher the accuracy of the oscillation circuit 17, and the higher the frequency, the higher the accuracy, and the oscillation circuit 17 can be accommodated inside the control device, so the frequency can be increased.

Furthermore, the proximate body 15 of the disk 14 and the proximal body 1 of the disk 11
If the number 2 is increased equally among these disks, it is possible to shorten the calculation cycle by simply changing the constant within the calculation circuit.

[Brief explanation of drawings]

FIG. 1 shows the constituent countries of a winding diameter detection device showing an embodiment of the present invention, FIG. 2 shows a block diaphragm of the present invention, and FIG. 3 shows a time chart of the present invention. 1... Roll paper, 2... Shaft, 3...
...Variable speed motor, 4,6...Pulley, 5...
...Drive shaft, 7...Belt, 8...
・Infeed roller, 9...Press roller, 1
0...web, 11,14...disc,
12.15... Proximity, 13,16...
・Proximity switch, 17... Transmission circuit, 18...
... Control circuit, 19 ... Counter, 20.
... Counter, 21 ... Arithmetic circuit, 22
... Winding setting, 23 ... Comparison circuit, 2
4... Match signal, 25... Winding diameter display.

Claims (1)

[Scope of utility model registration request] a proximity switch that generates a pulse proportional to the number of rotations of the material to be wound by a proximity body attached to a shaft that supports the material to be wound; and a proximity switch that is attached to a rotating body that rotates in accordance with the amount of movement of the material of the material to be wound a proximity switch that generates pulses by the body, an oscillation circuit that oscillates at a constant frequency, and a first that counts the number of oscillations of the oscillation circuit between the pulses of the proximity switch that generates pulses proportional to the number of rotations of the wound material. a second counter circuit that counts the number of oscillations of the oscillation circuit between pulses of a proximity switch that generates a pulse corresponding to the amount of movement of the material; and a counter circuit of the first and second counter circuits. an arithmetic circuit that calculates the diameter of the reel by calculating a numerical value; a display device that displays the calculated diameter of the reel; and a display device that displays the calculated diameter of the reel; What is claimed is: 1. A winding diameter detection device comprising a device that outputs a coincidence signal when the winding diameter is detected.