JPS5937684Y2 - thickness measuring device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thickness measuring device for measuring the thickness of paper, etc.

In currently known devices in which sensors, etc. are arranged above and below the object to be measured, and the distance between them varies depending on the thickness of the object, the object to be measured may exist for some reason. If the object is no longer present, the interval becomes zero and the upper and lower sensors come into contact with each other, making it difficult to continue measurement even if objects to be measured are sent from now on.

Therefore, it is not suitable for an online thickness measuring device.

An object of the present invention is to provide a thickness measuring device that can also be used online.

FIG. 1 is a sectional view showing an embodiment of the mechanical part of the thickness measuring device according to the present invention.

In the figure, i+ is a cylindrical case with an opening at the bottom end, 2 is an elastic membrane attached to case 1 so as to close the opening of case 1, and 3 is a target attached to the center of elastic membrane 2. part, 4 is the target part 3 in case 1
It is a coil spring suspended inside.

The target section 3 is a hollow container, and at least the lower surface (the surface or the vicinity of the surface) of the signboard 31, which is the bottom surface, is made of a conductive material.

Furthermore, a large number of holes 32 are formed in the signboard 31, as shown in FIG.

The case 1 is provided with a pressure introduction port LL12, and the compressed gas guided to the pressure introduction port 11 by a tube 13 enters the inside of the target part 3 via a flexible tube 14, and enters the target section 3, and enters the target section 3 through a flexible tube 14. It is designed to blow out downward from the hole 32 of 31.

Further, the compressed gas guided by the tube 15 to the pressure introduction port 12 enters the case 1 and has the function of pushing the elastic membrane 2 downward.

5 is a cylinder, 6 is an eddy current sensor that detects the distance to the signboard 31 (displacement of the signboard 31), and T is a plate.

A contactor of a sensor 6 is attached to the upper surface of the cylinder 5,
A plate 7 is attached to the lower surface of the cylinder 5.

8 is a stopper, 9 is a coil spring disposed between the stopper 8 and the plate 7, and 10 is a push-up device such as an air cylinder for pushing up the sensor 6.

The shoulder portion 51 of the cylinder 5 is used to determine the stopping position when the cylinder 5 is pushed up by the push-up machine 10.

20°30 is the light emitting element 40 attached to the stopper 8
゜50 is the case 1 facing the light emitting element 20.30.
This is a light-receiving element attached to the

These light emitting elements 20, 30 and light receiving elements 40, 50 form part of a detection section DET (described later) that detects an object to be measured.

FIG. 3 shows the electrical configuration of the device of the present invention.

In the figure, 40A and 50A are switches which are part of the detection unit DET, and are open when the light receiving elements 40 and 50 are receiving light.

These switches 40A and 50A+ are connected in series.

60 is a switch that is connected in parallel to the switches 40A and 50A and is closed only when checking; 10 is a switch that is connected in series to the parallel circuit and is closed when driving; 80
90 is a power supply, and 90 is a control unit.

This control unit 90 only operates when current is flowing there.
It supplies compressed air into the case 1 and operates the push-up machine 10.

The object to be measured is placed between the target section 3 (signpost 31) and the sensor 6, as shown by the imaginary line S in FIG.

Therefore, only when the object to be measured is present above the light emitting elements 20 and 30, light does not reach the light receiving elements 40 and 50, and the switches 40A and 50A are closed.

Next, the operation of this embodiment will be explained.

First, when not measuring, the switch TO is open, so no current flows through the control section 90.

Therefore, compressed gas is not guided into the case 1, and the target portion 3 is pulled up by the spring 4.

Further, the sensor 6 and the like are pulled down by a spring 8.

Therefore, the distance between the target section 3 and the sensor 6 is kept large, and the object to be measured can be easily inserted.

Next, during measurement, the switch 70 is closed.

Therefore, when the object to be measured exists between the target section 3 and the sensor 6, the control circuit 90 operates, and in case 1
Compressed gas at a constant pressure is introduced into the push-up machine 1.
0 pushes the sensor 6 into position.

In this state, compressed gas at a constant pressure is also introduced into the target section 3, and the gas is blown out from the hole 32 downward.

Therefore, the force generated by the weight of the target part 30 and the pressure in the case 1 (the force after canceling the reaction force by the spring 4) and the blowing out of the compressed gas in the target part 3 cause the target part 3 and the object to be measured to The target portion 3 is floating at a position where the repulsion force generated between the target portion and the repulsion force is equal to each other.

Here, since the pressure of the gas guided into the case 1 and into the target section 3 is constant, the distance between the surface of the object to be measured and the surface of the signboard 31 (the flying height of the target section 3) is constant. .

Therefore, the vertical movement of the target section 3 caused by the movement of the object to be measured (usually in a direction perpendicular to the plane of the paper in FIG. 1) or the movement of the measuring device during scanning is a variation in the thickness of the object to be measured. The thickness of the object to be measured can be determined from the output of the sensor 6.

Note that the switch 60 is closed (the switch 70 is also closed) during zero point adjustment and the like.

In this device, when there is no object to be measured between the target section 3 and the sensor 6, the distance between the target section 3 and the sensor 6 is kept large even during measurement.

Therefore, even if the object to be measured is sent intermittently due to paper shortages, excessive scanning distance, etc., the target section 3 and
An object to be measured can enter between the sensors 6.

When the object to be measured enters between the target section 3 and the sensor 6, the switches 40A and 50A are closed and the control section 10
operates, and the above measurement operation is repeated.

Therefore, it can also be used online. In addition, in the above description, although the simple detection part DET which consists of a light emitting element, a light receiving element, etc. was shown, it is natural that the detection part can be comprised by other means.

Further, although the configuration having two detection points is shown, it may be one or three or more.

However, it is advantageous to have a plurality of detection points because the absence of the object to be measured can be detected from various directions.

As explained above, according to the present invention, it is possible to provide a thickness measuring device that can also be used online.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the mechanical part of the thickness measuring device according to the present invention, and FIG. 2 is a configuration diagram showing the shape of the target plate.
FIG. 3 is a connection diagram showing the electrical configuration of the thickness measuring device according to the present invention. 1... Case, 2... Elastic membrane, 3...
...Target part, 4...Spring, 5
... tube, 6 ... sensor, 7 ...
・Plate, 8... Stopper, 9...
Spring, 10...Pushing machine, 20, 30...
... Light emitting element, 40,50... Light receiving element,
40A, 50A. 60.70... Switch, 80... Power supply, 90... Control unit, 31... Sign board,
DET...detection section.

Claims (3)

[Scope of utility model registration request] (1) A case with an opening at one end, an elastic membrane that closes the opening of the case, a target section that blows out gas downward from a hole in a signboard that is provided at the center of the elastic membrane, and the target. A sensor is placed facing the signboard of the section and outputs a signal corresponding to the distance from the signboard, a detection part is placed around this sensor and detects the presence of the object to be measured, and A thickness measuring device comprising: a control section that supplies compressed gas into the case and pushes up the sensor when the presence of the object to be measured is confirmed. (2) As the detection section, use one that has multiple detection points and outputs a signal indicating that the object to be measured has been detected only when the presence of the object to be measured is confirmed at all of these detection points. 1. A thickness measuring device according to claim 1, which is characterized in that: (3) A thickness measuring device according to claim 1 or 2, characterized in that the detecting section includes a light emitting element and a light receiving element.