JPH05305B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for detecting the end time of unwinding of a rolled sheet.

(Prior art) When processing sheet-like materials such as fabrics, leather-like sheets, plastic sheets, etc. that have been conventionally wound into a roll, the rear end of the preceding sheet-like material is unwound from one core to a processing device. Then, the front end of the trailing sheet-like material unwound from the next different core is joined and sequentially and continuously processed. In order to join the front end of the trailing sheet to the rear end of the leading sheet, the operator must check in advance the scheduled end time of unwinding the leading roll sheet, and
It is absolutely necessary to join the trailing sheet to the leading sheet before the end of unwinding. The scheduled end time for unwinding such a rolled sheet can be determined by an operator constantly monitoring the thickness of the winding diameter of the rolled sheet and predicting the unwinding end time by intuition, or by attaching a tachometer to the core of the sheet. The end time of unwinding is predicted by comparing the number of revolutions obtained with the tachometer and the number of revolutions calculated in advance from the length of the roll-shaped object.

(Problems to be Solved by the Invention) However, the method in which an operator constantly monitors the thickness of the roll diameter of a rolled sheet is inefficient, and as the number of sheet processing devices increases, it becomes necessary to virtually constantly monitor the thickness of the rolled sheet. is not possible.

In addition, the method of predicting the unwinding end time based on the number of rotations of the core is based on the idea that the number of rotations of the core is proportional to the amount of unwinding of the sheet, but in reality, the number of rotations of the core and the amount of unwinding of the sheet Due to the relative slippage that occurs between the material and the material, it is not possible to accurately determine the amount of sheet material to be unwound from the number of rotations of the core, and it is not possible to accurately determine the length of the material that has been wound onto the core in advance. There was a problem in that the number of turns on the winding core had to be calculated from this measured value.

Therefore, an object of the present invention has been made to solve the above-mentioned problems.The purpose of the present invention is to calculate the unwinding end time according to a preset calculation formula based on the change in the thickness of the winding diameter of a rolled sheet. A device for detecting the end time of unwinding of a rolled sheet is provided, which can efficiently perform the work of joining the rear end of the leading rolled sheet and the front end of the trailing rolled sheet by automatically calculating and displaying the time. It is to provide.

(Means for Solving the Problems) As shown in FIG. 1, the device for detecting the end time of unwinding of a rolled sheet according to the present invention detects a rolled sheet 1 in which a sheet material 3 is wound around a core 2. A transmitter 4 that transmits an electromagnetic wave or an optical signal to the surface, and a receiver 5 that receives signals reflected from the surface of the sheet-like object.
, distance calculation means 7 for calculating the distance between the transceivers 4 and 5 and the surface of the rolled sheet from the time taken to receive the signal reflected on the surface of the sheet-like object; a winding diameter/thickness calculation means 9 for calculating the thickness of the winding diameter of the rolled sheet from the radius of the winding core 2 of the rolled sheet input by the input means 8 and the distance from the center of the rolled sheet to the transmitter/receiver; a pulse generating means 10 that transmits a pulse every time the shaped sheet rotates once;
Interrupting means 11 which interrupts the pulse into the signal from the winding diameter and thickness calculating means 9; and an unwinding end time calculating means 13 for calculating the unwinding end time of the rolled sheet using a preset calculation formula based on the signal from the interrupting means two times before and the elapse of time; A display means 14 is provided for receiving and outputting a signal.

(Function) In the present invention, a signal transmitted to the surface of a rolled sheet is reflected by the sheet surface, and by receiving this reflected signal, only the round trip time of the signal traveling back and forth between the transmitter and receiver is measured. The distance between the transceiver and the surface of the rolled sheet is continuously calculated from the measured value, and each time a pulse signal emitted every time the core is rotated is inserted into this continuously calculated signal. In addition, since the unwinding end time of the rolled sheet can be calculated by a microcomputer according to a preset calculation formula, it is possible to continuously and automatically know the accurate unwinding end time of the rolled sheet. can. Therefore, it is not necessary for the operator to stand by and monitor the joining of the preceding rolled sheet and the trailing rolled sheet, so that the burden on the operator can be reduced.

(Example) Next, an example of the apparatus of the present invention will be described with reference to the drawings.

As shown in FIG. 1, both ends of a winding core 2 around which a sheet material is wound in multiple layers are rotatably supported by bearings (not shown) and driven by a drive machine.
A sheet-like material is wound around the winding core 2 to form a rolled sheet 1. A transmitter 4 for transmitting a signal to the surface of the rolled sheet and a receiver 5 for receiving the signal reflected from the surface of the rolled sheet are installed at a predetermined position apart from the rolled sheet. The transceivers 4, 5 may be separate as shown in FIG. 1, or may be integrated. Transmitter/receiver 4, 5 from the center of the rolled sheet
An integrated transceiver is preferably used to maintain a constant distance. The signal emitted from the transmitter is a signal reflected on the surface of the rolled sheet,
For example, ultrasonic waves, light, etc. are used. Signals from the transceivers 4 and 5 are sent to distance calculation means 7. In the distance calculating means 7, the signal transmitted from the transmitter 4 is reflected on the surface of the rolled sheet, and the distance between the transceivers 4 and 5 from the surface of the rolled sheet 1 is determined by the time it takes for the receiver 5 to receive this reflected signal. Calculate the distance (Dn) to The signal calculated by the distance calculating means 7 is sent to the winding diameter and thickness calculating means 9, and the radius (r) of the winding core inputted in advance by the key input means 8 and the distance from the inside of the winding core to the transceiver are
From (L), the thickness (dn) of the winding diameter of the rolled sheet 1 is calculated using the formula L-Dn-r. Since signals are continuously transmitted from the transmitter 4, the thickness (dn) of the winding diameter of the rolled sheet is continuously calculated.

However, the shape of a rolled sheet is not necessarily a perfect circle due to the winding tension of the sheet, the properties of the sheet, etc., so even if the unwinding end time is calculated from the continuously calculated thickness of the rolled sheet. It is not practical because the time variation is large. Therefore, in the present invention, the pulse generating means 10
When it is detected that a signal from the 3D is transmitted to the same position on the surface of the rolled sheet, that is, every time the winding core rotates once, a pulse is generated, and when the pulse is sent out, the interrupting means 11 The current winding diameter and thickness signals are taken in. Such an interrupt signal may be generated, for example, by fixing a magnet to the surface of the winding core 2 and generating a pulse when a magnetic switch 6 attached at a position away from the rolled sheet senses magnetism. When a pulse is sent from the pulse generating means 10 to the interrupting means 11, the thickness (dn) of the winding diameter of the rolled sheet at that time
is taken into the unwinding end time calculation means 13. The unwinding end time calculation means 13 calculates the winding diameter thickness (d _o-1 ), (d _o-2 ) calculated last time and the time before the previous time stored in the storage means 12 and the time (T _{o -1} ), (T _o-2 ) using the following formula,
The unwinding end time is calculated. That is, x: Length of the sheet material wound around the core (m) v: Unwinding speed of the sheet material from the core (m/sec) Then, the unwinding end time T of the rolled sheet is T= x/v (sec).

If we find x here, x=2π(nr+n(n-1)/2・w)...(1) becomes.

However, r: radius of the winding core w: thickness of the sheet-like material d: thickness of the winding diameter of the rolled sheet n: number of turns Next, substituting n=d/w into equation (1), equation (1) becomes x=π /wd ² + (2r/w-1)πd ...(2) Then, by substituting equation (2) into T=x/v, this equation becomes T=π/wvd ² + (2r/w-1)π /vd...(3) becomes. Here, if K ₁ =π/wv and K ₂ =(2r/w−1)π/v, equation (3) becomes T=K ₁ d ² +K ₂ d (4).

Using equation (4) to create equations at times t _o-2 , t _o-1 , and tn, T + H _o-2 = K ₁ d ² _o-2 + K ₂ d _o-2 ... (5) T + H _{o -1} = K ₁ d ² _o-1 + K ₂ d _o-1 ...(6) T = K ₁ d ² n + K ₂ dn ...(7). However, as shown in Figure 2, tn is the current time, t _o-1 and t _o-2 are past times, d _o-1 is t _o-1 and
d _o-2 is the thickness of the roll diameter of the rolled sheet at t _o-2 ,
H _o-1 and H _o-2 are the values obtained by subtracting _to-1 and to _-2 from tn, respectively.

From equations (5), (6), and (7) above, K ₁ and K ₂ are respectively K ₁ = H ₁ (d _o-1 − d _o ) − H ₂ (d _o-2 − d _o )/(d _o-2 −d _o )
(d _o-2 −d _o-1 ) (d _o-1 −d _o )……(8) K ₂ = H ₂ (d _o-2 −d _o ) (d _o-2 +d _o )−H ₁ (d _o-1 −d _o )(
d _o-1 + d _o ) / (d _o-2 − _{d o} ) (d _o-2 − _{d o-1} ) (d _o-1 − _{d o} )
...(9) becomes.

Therefore, the thicknesses of the winding diameters (d _o-1 ), (d _o-2 ) of the previous time and the time before the previous time stored in the storage means 12, the times (H ₂ ), (H ₁ ) from the previous time and the time before the previous time, and the interruption Means 1
The current thickness (dn) of the winding diameter sent out from 1 is (8)
K ₁ and K ₂ are obtained by substituting into the equations and (9), and then the unwinding end time is calculated by substituting K ₁ and K ₂ into the equation (7). Therefore, if this calculation program is incorporated into the unwinding end time calculation means 13, the unwinding end time can be easily calculated. The signal from the unwinding end time calculation means 13 is transmitted to the surface means 14.
It is sent out and displays the unwinding end time, the time until the end of unwinding, etc.

FIG. 3 is a flowchart showing the processing contents of the unwinding end time calculation means 13 of FIG. 1, and the processing means is as follows. In FIG. 3, when an interrupt input is input, the interrupt is accepted and the process proceeds to the next step.

Compare the previous winding diameter thickness (d _o-1 ) stored in memory with the current winding diameter thickness (dn), and if (d _o-1 − _{d o} ) is larger than the set value (K ₁ ). Go ahead.

Calculate by inputting data into the set calculation formula.

Display the above calculation results on CRT.

On the other hand, if (d _o-1 −d _o ) is smaller than the set value, then the time before the previous time (H _o-2 ) is further compared to see if it is larger or smaller than the set value (K ₂ ), and (H _{o -2} ) is greater than the set value, proceed to step.

Assuming that unwinding has finished, stop unwinding.
Display on CRT.

As shown in FIG. 4, the device of the present invention sends out a rolled sheet 1 wound around a winding core, processes it in a processing device 16, and winds up the processed sheet onto a winding roll 17. The unwinding end time is automatically calculated by transmitting signals from the transmitter/receiver 4, 5 and magnetic sensor 6 attached to the upper frame (not shown) of the sheet 1, and processing the reflected signals by a microcomputer. The results are displayed continuously on the display. Further, the alarm may be issued before the end time of unwinding, taking into consideration the time required for joining the sheet-like materials.

FIG. 5 shows an example of simultaneously unwinding sheet materials from a plurality of rolled sheets 1.
Transmitter/receiver 4, 5 and magnetic sensor 6 are installed on the top of the
The optical conversion circuit 18 converts these signals from electrical signals to optical signals, and the central control room converts them back into electrical signals using the electrical conversion circuit 19. The microcomputer 20 processes these electrical signals. You can also do that. In this case, a display device corresponding to each rolled sheet may be provided, or a single display device 21 may be used for switching.

(Effects of the Invention) As described above, the device of the present invention can continuously calculate and display the unwinding end time of the rolled sheet from the winding diameter and thickness of the rolled sheet using the above calculation formula, so that the device can continuously calculate and display the unwinding end time of the rolled sheet. The work of joining rolled sheets can be carried out in a planned manner, and the burden on the worker can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the control of the apparatus of the present invention, FIG. 2 is an explanatory diagram of the program calculation formula according to the present invention, FIG. 3 is a flowchart showing the processing contents of the program, and FIG. is a schematic side view of the apparatus of the present invention, and FIG. 5 is an explanatory diagram when a plurality of rolled sheets are used. DESCRIPTION OF SYMBOLS 1... Rolled sheet, 2... Core, 3... Sheet-like body, 4... Transmitter, 5... Receiver, 6...
magnetic sensor.

Claims (1)

[Claims] 1 A transmitter/receiver that transmits a signal to the surface of a rolled sheet and receives a signal reflected by the surface of the sheet, and the time required for the signal to travel back and forth between the transmitter/receiver and the time between the transmitter/receiver and the surface of the rolled sheet. a distance calculating means for calculating a distance; a winding diameter/thickness calculating means for calculating the thickness of the winding diameter of the rolled sheet in response to a signal from the distance calculating means; and a pulse being emitted every time the rolled sheet rotates once. pulse generating means for generating a pulse, interrupting means for intervening the pulse into a signal from the winding diameter and thickness calculating means, and generating a rolled sheet according to a preset calculation formula each time the signal is received from the interrupting means. 1. An unwinding end time detecting device for a rolled sheet, comprising an unwinding end time calculation means for calculating and outputting an unwinding end time of a rolled sheet.