JPH01180409A - Plate thickness detecting method by rotary encoder of two-sheet take detecting device for plate - Google Patents

Abstract

PURPOSE:To decide many kinds of plate thickness and to detect a two-sheet take by providing the rotary encoder which outputs the thickness of a plate material in the form of a pulse quantity. CONSTITUTION:A fixed plate 3 is provided with a swivel plate 5 and when the thickness of the plate material W is detected, the swivel plate 5 is rotated by 90 deg. by an actuator 7 to a pass line for the plate material. The clamp 15 consisting of an upper arm 11 and a lower arm 13 (fitted with contactors 21 and 23 atop) and the detecting device 9 consisting of the rotary encoder 19, etc., are mounted on the plate 5. When the plate thickness is measured, the number of pulses from the B position to the C position of the clamp 15 is counted and stored as an initial value in a RAM 33. Then the plate material W is inserted into the clamp 15 and the number of main pulses from the B position to the contacting of the contactors 21 and 23 with the plate material W is counted. A CPU 29 multiplies the difference between the initial value and the number of main pulses by a specific value to a calculate the plate thickness and displays the result on a device 37. Thus, many kinds of plate thickness are decided and the two-sheet take is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention] (Industrial Field of Application) The present invention relates to a method for detecting plate thickness using a rotary encoder of a two-plate warehouse detection device in a plate processing machine.

(Prior Art) Conventionally, when supplying plates to a plate processing machine such as a press, the stacked plates are sucked by, for example, a vacuum pad, and are fed one by one to the processing machine. However, if the plates are thin or coated with anti-corrosion oil, two or more plates may be fed into the processing machine in close contact with each other, causing damage to the processing machine and mold, and damage to the operator. There was an accident in which a person was injured.

In order to prevent this kind of so-called double-layering, conventionally, a non-contact sensor method that uses eddy current or a method that detects the board thickness using a light-shielding plate that moves depending on the board thickness and multiple microscopic light-receiving elements has been used to detect the board thickness. It has been used as a detection device.

(Problems to be Solved by the Invention) The above-mentioned non-contact sensor method requires adjustment each time the sensor output changes depending on the material of the plate material, and cannot be used when the plate material is non-metallic. There wasn't. It was also necessary to make adjustments depending on the presence or absence of coating on the surface of the plate material. Furthermore, it is necessary to maintain a constant distance between the plate surface and the sensor, and if the distance changes due to a change in plate thickness, there is a problem in that an error occurs.

In addition, the current method using a light-shielding plate and multiple microscopic light-receiving elements can distinguish up to 10 types of plate thickness, and in the case of a plate thickness between these, the thickness of the currently flowing plate must be determined in advance. It was necessary to know whether or not two sheets were taken from the measured thickness of the sheet.

Even with the current method, it is possible to detect two sheets of plate material with more than 10 different thicknesses, but for example, the discrimination between 0.9ml and 1.011(7) is different from the type of discrimination. It is impossible because there are few. Therefore, the plate thickness is usually 0.
If an operator accidentally drops a plate material with a thickness of 1.0I11 onto a processing line where a 9cm plate material is flowing, it will flow into the processing line without being detected unless two sheets are taken out.

This invention was devised with a focus on these issues, and it is possible to output the plate thickness as pulse scratches from a rotary encoder, distinguish various types of plate thickness, and detect double-layered plate material. The object of the present invention is to provide a method for detecting plate thickness using a rotary encoder of a two-plate detection device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes a clamp having upper and lower arms that rotate in opposite directions around the same axis. A contact element for clamping the plate material was provided, and a rotary encoder was provided at the center of rotation of the clamp. In the double plate detection device, (a) Close the clamp from the open end position A, and count the main pulses from the C position where the Z-phase pulse as an auxiliary pulse of the rotary encoder is generated, to the clamp leap position @C. Find the number of main pulses and set this as the initial value Pa.

(b) Next, at the left position of the clamp, a plate material is inserted between both liquid contactors of the clamp, the clamp is closed, and the main pulses are counted from the C position where the Z-phase pulse is generated.

(C) Let P be the count value of the main pulse until both types of contactors come into contact with the plate material.

(d) Calculate the plate thickness from the initial value Po and the count value P, and display it as -.

The process consists of the steps <a> to (d) above.

In this case, the A position of the clamp, 8th position 1. As shown in Figure 2, the C position is the open end and the 2nd position of the rotary encoder.
These are the generation position of the phase pulse (auxiliary pulse that occurs once per rotation) and the open end. Normally, the clamp is waiting at position A.

(Operation) Next, procedure 6 of the present invention will be explained with reference to the flowchart of FIG.

According to step (a), the distance from the 8th position of the clamp to the C position is converted into the number of main pulses of the rotary encoder, and this becomes the initial value Po. This corresponds to step (1).

According to step (b), re-contact the plates by inserting one person between them.
When the clamp is closed, the main pulses are counted from position C using two-phase pulses. This corresponds to step (2).

According to step (C), the distance from the 8 points of the lamp until it contacts the plate material is converted into the number of main pulses, which becomes the count number. This corresponds to steps (3) and (4).

According to step (d), the difference between the initial value Po and the counted value P is determined, and this is multiplied by a certain number to determine the plate thickness, which is displayed on the display. This is step (5).

This corresponds to (6).

(Example) Next, an example of the present invention will be described based on the drawings. As shown in FIG. 4, the two-claw detection device 1 has a rotating plate 5 provided on a fixed plate 3, and when detecting the thickness of the plate material W using the actuator 7, the pass line of the plate material is detected as shown by the arrow. Turn 90 degrees to A detection device 9 is mounted on the rotating plate 5.

This detection device 9 has an upper arm 11. Clamp 15 consisting of lower arm 13. Drive mechanism 17. It is composed of a rotary encoder 19 and the like. rotary encoder 19
0 main body is fixed to the upper arm 11 of the clamp, and its output shaft is fixed to the lower arm 13, respectively. Contacts 21.2 are provided at the ends of the upper and lower arms, respectively.
3 is installed.

FIG. 3 shows an example of a total of 81111 II devices. As shown in the figure, the A-phase and B-phase pulse signals of the rotary encoder 19 are quadrupled by a quadrupling circuit 25 in order to increase the resolution, and become one main pulse signal. This main pulse signal is connected to the parallel I1 along with the 7-phase signal.
0 port 27.

The Z-phase signal is adjusted in advance so that it is generated when the distance between the two contacts 21 and 23 of the clamp 15 is approximately 20Illll.

When the Z-phase pulse signal enters the parallel I10 port 27,
This port outputs to the quadrupling circuit 25 a signal (signal E shown in the figure) for a certain period of time, which enables the main pulse signal to be input to the central processing unit (hereinafter referred to as CPU) 29. That is, this Z-phase pulse signal is an interrupt signal to the CPtJ 29, and this signal causes the CPU 29 to cause the counter 31 to count the main pulse signals from the B position to the C position of the clamp.

In measuring the plate thickness, first, the number of main pulses Po from the 8th position of the clamp to the C position is counted, and this is stored in the RAM 33 as an initial value. Next, a plate material is inserted into the clamp, and the number of main pulses P from the 8th position until both contacts come into contact with the plate material is counted.

CPtJ29 is a constant value (1
The plate thickness is calculated by multiplying by the distance traveled by both contacts per pulse, and this is displayed on the display 37.

The initial 11Po only needs to be measured once when the power is turned on.

[Effects of the Invention] As understood from the above explanation, the present invention has the structure described in the claims, so it is possible to discriminate many types of plate thicknesses, and it is possible to detect two-piece plates. is possible. Furthermore, since the measurement is performed using the Z-phase pulse as a reference, the measured value is not affected by mechanical backlash or the like.

Therefore, there is no need to make adjustments in response to wear and the like after the detection device is assembled, so maintenance is free, and measurement errors due to equipment deterioration are small. Moreover, according to this detection method, the measuring equipment can be downsized and the cost can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a flowchart corresponding to the procedure of this invention, Fig. 2 is an explanatory diagram of the position of the clamp, Fig. 5 is a block diagram showing an example of measuring equipment used in carrying out this invention, and Fig. 4 is a diagram of this invention. FIG. 2 is a three-dimensional view of a two-claw detection device for a plate material. Explanation of symbols representing main parts of the drawings 1...Two-claw detection device 11...Upper arm 13...Lower arm 15...Clamp 1
9...Rotary encoder 21.23...Contactor 29...Central processing unit 31...Counter 3
7...Display device agent Patent attorney Yasuo Miyoshi

Claims (1)

[Claims] A contact for clamping a plate is provided at the tip of a clamp consisting of upper and lower arms that rotate in opposite directions around the same axis, and a rotary encoder is installed at the center of rotation of the clamp. In the double plate detection device provided, (a) the clamp is closed from the open end position A, and the main pulses are counted from the B position where the Z-phase pulse as an auxiliary pulse of the rotary encoder is generated until the clamp is closed at the closed position C; Find the number of main pulses and set this as the initial value P_0. (b) Next, at position A of the clamp, a plate material is inserted between both contacts of the clamp, the clamp is closed, and main pulses are counted from position B, where the Z-phase pulse is generated. (c) Count the main pulses until both contacts come into contact with the plate material, and let this counted value be P. (d) Calculate the plate thickness from the initial value P_0 and the count value P and display it. A plate thickness detection method using a rotary encoder of a double plate detection device, characterized in that the thickness of the plate is detected by the steps (a) to (d) above.