JPH06323819A - Elongation/contraction measuring apparatus for film material - Google Patents

Abstract

PURPOSE:To allow noncontact measurement of the elongation/contraction of a film material susceptible to the fluctuation in tension, temperature, humidity, etc., even for microvariation of load. CONSTITUTION:A sample film 3 is held between a film upper end holder of a link lever 1 and a film lower end holder 5 disposed below a thermostatic bath 2. A micrometer head 7 is then rotated to shift a counter weight 6 and the moment of a rotatable link lever 1 is increased thus exerting microtension of 1g, for example, to the sample film 3. Elongation of the sample film 3 is detected based on the displacement of an optical analog displacement sensor 8 caused by the rotation of the reflective surface 13 of a sensor protrusion 12 projecting from the link lever 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the expansion / contraction length of a film material which easily expands / contracts due to the application of tension and environmental changes such as temperature and humidity.

[0002]

2. Description of the Related Art A film material, for example, a transparent film material having a film thickness of 30 μm or less to be laminated on the surface of gravure printing, can be stretched by applying a slight tension, Some stretch and then shrink, and some stretch even with slight changes in environmental conditions such as temperature and humidity. For such a film material, it is necessary to measure in advance how much it expands and contracts when a predetermined tension is applied under constant environmental conditions.

For this reason, various methods, devices, jigs, etc. have been proposed in the past, but there is a very high demand for measuring expansion and contraction due to load fluctuation of 1 gram, for example. I couldn't handle it.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an apparatus for measuring the expansion / contraction length of a film material, which can measure the minute load fluctuations as described above in a non-contact manner.

[0005]

In order to achieve the above-mentioned object, a device for measuring the expansion and contraction length of a film material according to the present invention has a link lever rotatably supported at an intermediate position in the longitudinal direction and a measurement with one end fixed. Film end holding means for attaching and holding the other end of the target film material to one end of the link lever, a weight for holding the other end of the link lever at a position variable in the longitudinal direction of the link lever, and a position of the weight. , A sensor projection having a substantially flat reflecting surface and rotating together with the link lever, and emitting light toward the reflecting surface of the sensor projection and receiving the reflected light to receive the link. And an optical measuring means for detecting the displacement of one end of the lever.

In the expansion / contraction length measuring device for a film material according to the present invention, the weight position changing means is a micrometer head, and the link lever has a shaft extending coaxially to the other end side. Can be mounted on the shaft together with the counter weight.

In the expansion / contraction length measuring device for a film material according to the present invention, the optical measuring means may be an optical analog displacement sensor.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

First, the main constituent elements of the apparatus of this embodiment are shown. In the figure, 1 is a link lever, 2 is a thermostatic chamber, 3 is a sample film to be measured, 4 is a film upper end holding device, and 5 is a film lower end holding device. A device, 6 is a counter weight, 7 is a micrometer head, and 8 is an optical analog displacement sensor.

In the link lever 1, a pair of support plates 10 and 10 are erected on a base 9 fixed to the upper part of the constant temperature bath 2, and a pin 11 is axially supported between the support plates 10 and 10 in the longitudinal direction. As shown by the arrow in the figure, it is rotatably supported in the vertical direction. Further, a sensor projection 12 is made to project from the position supported by the pin 11 of the link lever 1 in a substantially downward direction so as to rotate integrally with the link lever 1.
This sensor projection 12 has a flat reflecting surface 13 at the lower end. Further, a shaft 14 extending coaxially is provided on the rear end side of the link lever 1.

The film upper end holding device 4 is a link lever 1.
The upper and lower ends of the sample film 3 are held between the sample lower end holding device 5 and the lower end holding device 5 attached to the lower end of the constant temperature bath 2. The film upper end holding device 4 includes a base 15 mounted on the tip of the link lever 1 and a pair of connecting rods 1.
6, 16, a connecting base 17 and a film holding plate 18. The connection base 17 and the film holding plate 18 are arranged inside the constant temperature bath 2, and the heat insulating material 1 of the constant temperature bath 2 is used.
A connecting rod 16 penetrating 9 connects between the base 15 outside the constant temperature bath 2 and the connecting base 17 inside the constant temperature bath 2.
The film holding plate 18 is pivotally supported on the connection base 17,
The upper edge of the sample film 3 can be sandwiched between the lower edges.

The film lower end holding device 5 comprises a base 20 fixed to the lower side of the thermostat 2, a pair of connecting rods 21 and 21 penetrating the base 20 and the heat insulating material 19 of the thermostat 2, and a film holding plate 22. I am doing it. Film holding plate 2
2 is arranged in the constant temperature bath 2 so as to face the film holding plate 18 of the film upper end holding device 4, and the connecting rod 21 is
Film holding plate 2 inside base 20 outside constant temperature chamber 2 inside
It is connected between the two. The film holding plate 22 is fixed to the upper end of the connecting rod 21, and the sample film 3 is attached to the upper edge.
It is designed so that the lower edge of can be pinched. Although a detailed illustration is omitted, the base 20 is provided with a clamp mechanism, and by operating a pair of clamp levers 23, the constant temperature bath 2
The length of the connecting rod 21 protruding inward, in other words, the holding position of the sample film 3 by the film holding plate 22 can be changed.

The counterweight 6 and the micrometer head 7 are mounted on the shaft 14 of the link lever 1. By operating the micrometer head 7, the counterweight 6 is moved along the shaft 14, and the counterweight 6 is linked. By changing the moment generated on the rear end side of the lever 1 at each position, the link lever 1
The moment generated on the tip side can be changed to apply an appropriate tension to the sample film 3. For example, the scale of the micrometer head 7 is 0.00
The weight and the moving distance of the counterweight 6 are set so that a tension of 1 gram can be applied to the sample film 3 every half rotation, that is, from 0.5 mm to 0.50 mm. In addition, the connection mechanism between the counter weight 6 and the micrometer head 7, and the counter weight 6
As for the method of adjusting the tension of the sample film 3 depending on the position, a well-known mechanism, method, etc. may be adopted as appropriate, and therefore illustration and description thereof will be omitted.

The optical analog displacement sensor 8 uses a laser of a type called an optical analog sensor which detects a minute displacement of a measuring object by a change in an output voltage according to a change in the amount of received light. It is mounted on the base 9 like the support plate 10 of FIG. The mounting position faces the reflecting surface 13 of the sensor protrusion 12, and even if the sensor protrusion 12 rotates within a predetermined angle range, the emitted laser light L can surely enter the reflecting surface 13 and the reflected light L ′. Is the position where

Reference numeral 24 in the drawing denotes a fixed support base for the link lever 1, which is used when the link lever 1 does not rotate when the sample 3 is set or when the apparatus is not used. The tip of the lever 1 is placed so as not to rotate.

Next, a specific example of the expansion / contraction measurement of the sample film by the apparatus of this embodiment will be described. Link lever 1
The tip of the is supported by the fixed support base 24 to stabilize it so as not to wobble. Then, the sample film 3 is held between the film holding plate 18 of the film upper end holding device 4 and the film holding plate 22 of the film lower end holding device 5 in the constant temperature bath 2 set to a predetermined temperature and humidity condition, and the sample The position of the counterweight 6 is adjusted by the micrometer head 7 so that the link lever 1 is balanced in a state where the film 3 does not expand or contract.

Next, the micrometer head 7 is rotated by, for example, a tension of 1 gram, and the counterweight 6 is rotated.
Is moved to the rear end side of the link lever 1 by an amount corresponding to the rotation, the moment at the tip of the link lever 1 is increased, and a tension of 1 gram is applied upward to the sample film 3.

Next, the tip of the link lever 1 is removed from the fixed support 24, and the tension set above is applied to the sample film 3. Then, the sample film 3 exhibits elongation due to the applied tension from the state where the elongation is 0, and the front end of the link lever 1 rotates upward and the rear end thereof rotates downward accordingly.
Further, the sensor projection 12 protruding from the link lever 1 also rotates to the left in the figure as shown by the chain line in FIG. Therefore, the reflection surface 13 moves away from the optical analog displacement sensor 8, the amount of the reflected light L ′ changes correspondingly, and the output voltage of the optical analog displacement sensor 8 changes. The position of the reflecting surface 13 is detected by comparing this output voltage with the output voltage value at the reference distance. Further, if the constant temperature bath 2 is operated under desired conditions, continuous measurement can be performed. In addition, after the sample film 3 is fully stretched for a certain tension,
If you change the tension with that state as the measurement origin,
The relative amount of elongation is measured.

Of course, since the movement of the sensor projection 12 is a rotational movement about the support point of the pin 11, the elongation of the sample film 3 and the displacement of the reflecting surface 13 are not in direct proportion, and there are some errors. To do. For example, looking at how the elongation t = 10 mm of the sample appears as the displacement due to the rotation of the tip locus a of the link lever 1 having the length l = 200.0 mm, an error x as shown in FIG. 3 occurs. This error x is

## EQU1 ## 10-200sin (arctan (10/200)) = 0.124 (mm), which is a numerical value that can be practically ignored. Similar to this, a measurement error also occurs in the measurement depending on the position of the reflection surface 13, but if the sensor projection 12 is shorter than the link lever 1 or longer than the link lever 1, the difference is not so large as described above. Can be ignored as well. Although only the elongation of the sample film 3 is referred to in the above description, it is clear that the shrinkage can be measured in the same manner, and the description thereof will be omitted.

[0020]

Since the apparatus for measuring the expansion and contraction length of the film material according to the present invention is as described above, it becomes possible to easily measure the expansion and contraction of the film material with respect to a minute load change which has been difficult in the past. Since the measurement can be performed in a non-contact manner except when the material is attached to the device, there is an effect that the measurement accuracy is excellent.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an expansion / contraction length measuring device for a film material according to the present invention.

2 is a front view of the device of FIG. 1. FIG.

FIG. 3 is an explanatory diagram showing a measurement error by the apparatus of FIG.

[Explanation of symbols]

 1 Link Lever 2 Constant Temperature Chamber 3 Sample Film 4 Film Top End Holding Device 5 Film Bottom End Holding Device 6 Counter Weight 7 Micrometer Head 8 Optical Analog Displacement Sensor 9 Base 10 Support Plate 11 Pin 12 Sensor Protrusion 13 Reflective Surface 14 Shaft 15 Base 16 connecting rod 17 connecting base 18 film holding plate 19 heat insulating material 20 base 21 connecting rod 22 film holding plate 23 clamp lever 24 fixed support stand L laser light L'reflected light

Claims (3)

[Claims] 1. A link lever rotatably supported at an intermediate position in the longitudinal direction, and a film end holding means for attaching and holding the other end of a film material to be measured having one end fixed to one end of the link lever. A weight for holding the link lever at the other end of the link lever so that its position is variable in the longitudinal direction, a means for changing the position of the weight, and a sensor projection having a substantially flat reflecting surface and rotating together with the link lever. And an optical measuring unit that emits light toward the reflecting surface of the sensor projection and receives the reflected light to detect the displacement of one end of the link lever. Long measuring device. 2. The expansion / contraction length measuring device for a film material according to claim 1, wherein the weight position changing means is a micrometer head, and the link lever has a shaft extending coaxially to the other end side. The meter head,
A stretchable length measuring device for a film material, which is mounted on the shaft together with the counterweight. 3. The expansion / contraction length measuring device for a film material according to claim 1 or 2, wherein the optical measuring means is an optical analog displacement sensor.