JPS5910561Y2 - Continuous film thickness measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for continuously measuring the thickness of a strip such as a film.

Generally, either a non-contact method or a contact method is used to measure the thickness of a film. In the contact method, the film is usually run on a support base, and a sensor that can move up and down on the running film is used. The thickness of the film is measured by touching the head and taking out the amount of variation.

FIG. 1 shows a side view of such a measuring device.

In the figure, 2 is a pair of facing take-up rollers installed at the front end of the base 1, and 3 is a pair of supply rollers installed at the rear end of the base 1, which continuously measure the thickness at one point in the width direction. The film F to be processed runs at a predetermined speed between a supply roller 3 and a take-up roller 2 under tension.

4 is a detector disposed above the film running surface between both rollers 2 and 3; It consists of a movable arm 8 equipped with a spherical sensor head 7, and a thickness conversion element 9 that electrically extracts the amount of movement at the rear of the movable arm 8, and the signal extracted from the detector 4 is transmitted through the required circuits to provide an indication. The film is sent to a meter or recorder, and the film thickness or its variation is displayed.

10 is a coil spring that supports the rear end of the movable lever 8.

11 is a surface plate disposed below the film running surface facing the sensor head 7;
A rectangular parallel surface 1 is used to support the position of as a reference plane.
2 is taking shape.

Reference numeral 13 denotes a guide plate provided between rollers 2 and 3 to guide the running of the film.

Therefore, when the thickness of a single point in the width direction of the film F is continuously measured using such a device, tension is applied to the film F between the supply roller 3 and the take-up roller 2, and the film F slightly protrudes from the film running surface. Top parallel surface 12 of surface plate 11
The sensor head 7 presses the film F by the arm 8 which faces this and applies a pressing force from above to the parallel surface 12 using its own weight and the action of the coil spring 10. It travels while touching the parallel surface 12.

The height of the sensor head 7 from the parallel surface 12 at this time is the film thickness, so this positional displacement is taken out relative to the displacement of the rear end of the arm and the film thickness is measured. There were many errors and poor reproducibility.

As a result of various studies regarding these problems, the present invention was developed as a result of the fact that the apex of the surface plate 11 corresponding to the sensor head 7 is shaped into a parallel surface 12, so that the lower surface is in surface contact with the film F, and the upper surface is in contact with the film F. Contact may occur, resulting in slight deformation of the irregularities formed on the film F, or the height of the peaks of distortion remaining unchanged, or dust etc. remaining on the parallel surface 12, causing the reference plane (zero point) to fluctuate. It has been found that measurement errors occur due to such factors, and if the surface contact on the bottom surface of the film is changed to point contact (strictly speaking, it cannot be called point contact, but refers to contact with a spherical surface), measurement errors will be reduced and accuracy will be high. We found that measurements can be performed stably.

Although these improvements have significantly improved measurement accuracy,
It has the disadvantage that irregular noise often appears and the reproducibility is not sufficient.

After further study on this point, the inventor of the present invention discovered that the cause of the problem was dust attached to the film during measurement, and came up with the present invention.

That is, in the present invention, a spherical sensor head is provided at the tip of an arm that is attached to be able to reciprocate in one direction, and a film is run in contact between the sensor head and a support base to transfer the movement of the sensor head to the rear end of the arm. In a device that continuously measures the thickness of a running film through a thickness converter provided, the film contacting part of the support base is shaped into a spherical shape, and a roller that is fixed or rotatable on the upstream side of the support base is used. and its fixed pedestal are provided facing each other, and a non-metallic sheet is attached to the circumferential surface of the roller and the upper surface of the fixed pedestal.

Hereinafter, the present invention will be explained with reference to the drawings.

2 and 3 are a plan view and a side view showing an embodiment of the present invention.

In the figure, reference numeral 14 denotes a surface plate, on the top of which a hemispherical body 15 of approximately the same diameter is provided so as to slightly protrude from the guide plate 13 of the film F, corresponding to the spherical sensor head 7 fixed to the tip of the arm 8. It is being

A pair of swing arms 16 are rotatably connected to the rear part of the base 1 by a pin 17, and a circular roller 18 is fixed to the center thereof via a support bolt 19. 20 is a pedestal for the roller 18 provided on the base 1 facing the roller 18, and the pedestal 20 has a shape on the top as shown in FIG. It includes a trapezoidal groove 21 and a trapezoidal support block 22 inserted into the groove 21,
A rag 24 similar to the roller 18 is attached to the support block 22 so that almost the entire upper surface thereof protrudes from the groove 21.

25 is a shaft rotatably supported at a position below the rear end of the base 1;
A pair of eccentric cams 26 are fixed to both ends of the shaft 25 and support a pin 16' fixed to the lower surface of the swing arm 16 to regulate the lower end position of the swing arm 16.

27 is a lever for rotating the shaft 25.

Other symbols are the same as in FIG.

When measuring the film thickness using such a device, the swing arm 16 is opened, the film is passed between the swing arm 16 and the pedestal, and between the sensor head and the surface plate, and then passed through the take-up roller 2. The arm 16 is closed and the take-up roller 2 is rotated by a drive means (not shown) to cause the film F to travel.

As a result of this running, the film F first runs in contact with the stationary roller 18 (not rotating) and the pedestal 20 under moderate contact pressure, and the dust attached due to static electricity etc. is removed by the cloths 23 and 24. , and an appropriate tension is applied by the resistance when passing between them.

Next, the film F whose upper and lower surfaces have been cleaned of dust and given appropriate tension is sent to the sensor head 7, and the movement of the sensor head 7 is detected by the conversion element 9 and its thickness is measured. In this case, as shown in FIG. 3, since the lower surface of the film is in point contact like the upper surface, even the slightest distortion can be detected accurately and the film thickness can be measured with high precision and excellent reproducibility.

Here, it is necessary that the roller 18 not rotate during the measurement, or be fixed so that it can rotate slightly in the same direction, or be installed so that it rotates in the opposite direction to the running film.

Next, Figure 5 A, O, and C show the measurement records of film thickness using the device of the present invention and the conventional device described above. One with no dust removal device, one with a hemispherical top of the surface plate and no dust removal device, and one with a hemispherical top of the surface plate and a dust removal device (equipped with a roller 18 lined with cloth and a pedestal 20 as shown in Fig. 3). ) is an enlarged view of a portion of measurements taken on the same film three times along the same route using the present invention.

Here, A and B shown in A and B appear to be errors due to the effects of film distortion, etc., and adhering dust, respectively, but with the present invention in Section 8, these effects are almost absent and measurements can be made with good reproducibility and precision. It shows.

In the embodiments described above, the sensor head is configured to rotate in the vertical direction, but the arm may be regulated to move vertically so as to be able to move vertically in a straight line.

In addition, an eccentric cam was installed so that the contact pressure between the roller and the pedestal could be adjusted depending on the thickness or brand of the film to be measured, measurement conditions, etc., and the support position of the swing arm could be varied.
This is not necessarily required.

Furthermore, although the pedestal is shown as having a support block covered with rags that can be inserted and removed so that it can be easily replaced, the present invention is not limited to such a pedestal.

As a material for removing dust on the film and applying appropriate tension, thick rags is highly preferable due to its elasticity and great dust removal and protection effects, but in addition, commonly available cloth-like materials such as felt, or other films may also be used. Any material can be used as long as it does not cause any damage to the surface.

As explained above, according to the present invention, continuous measurement of film thickness can be carried out with very high accuracy, and its effects are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional embodiment, Figs. 2 and 3 are a plan view and a side view showing an embodiment of the present invention, Fig. 4 is a perspective view of the main part, and Fig. 5 A. FIG. 5C shows a measurement record obtained by the conventional apparatus, and FIG. 5C shows a measurement record obtained by the apparatus of the present invention. 14 is a surface plate, 15 is a hemisphere, 16 is a swing arm, 1
8 is a roller, 19 is a pedestal, 22 is a support block, 23-
24 is rasa, 26 is eccentric cam.

Claims (1)

[Scope of utility model registration request] A spherical sensor head is provided at the tip of an arm that is attached to be able to reciprocate in one direction, and a support base is provided facing the sensor head.A film is run in contact between the sensor head and the support base, and the sensor head In this device, the thickness of the traveling film is continuously measured using a thickness conversion element installed at the rear end of the arm. Continuous measurement of film thickness, characterized in that a fixed or rotatable roller and its fixed pedestal are provided facing each other, and a non-metallic sheet is pasted on the circumferential surface of the roller and the top surface of the pedestal. Device.