JPH0862060A - Calibrating method for pressure profile measuring sheet - Google Patents

Abstract

PURPOSE: To quickly perform calibration of high and low load regions and calibration of all pressure sensing points. CONSTITUTION: A pressure profile measuring sheet 1 is disposed in a box 2 which can be closed up. A medium 6 is boosted and introduced into the box 2. The pressure of the medium 6 can be controlled by a pressure regulating device 7 and a calibration pressure setting unit 8. By introducing the medium 6 into the box 2 and by making the pressure act on the sheet 1, signal amounts of pressure signals are read at all pressure sensing points at one time (at once). The pressure is set at each target pressure (reference value) for calibration in stages sequentially by the pressure regulating device 7, while it is calibrated in order in a measuring part 5 so that it be the target pressure (reference value) in each stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for calibrating a pressure profile measuring sheet.

[0002]

2. Description of the Related Art A pressure profile measuring sheet is a measuring instrument which has pressure-sensitive points (electrodes) on almost the entire surface of the sheet and converts the pressure sensed at each pressure-sensitive point into an electric signal to be taken in by a computer for measurement. . As an example of measurement using such a pressure profile measurement sheet, for example, a pressure profile measurement sheet is sandwiched between two units to be measured, and the pressure acting between the units is measured by a pressure signal (electricity) from a pressure sensitive point (electrode). It is known that a signal) is taken into a computer and the contact pressure between the units is measured by this. Conventionally, the pressure profile measurement sheet has been used for measuring a nip pressure of a relatively light load such as a printer roll or measuring a contact pressure profile of various consumer products.

Conventional pressure profile measurement sheets are small and narrow. This is because one of the reasons for preventing the increase in size and the increase in width is a problem related to calibration. Calibration is to determine the correction of the scale attached to the measuring instrument using an appropriate reference amount prior to the measurement.

As a method for accurately controlling and calibrating the pressure profile measurement sheet, a method mainly composed of a weight has been conventionally used. This is a method for calibrating by comparing a measurement value obtained by applying a pressure to a pressure profile measurement sheet by the weight of a weight and comparing the measurement value with a reference value (hereinafter referred to as “prior art 1”).

However, the calibration method based on the weight of the prior art 1 has the following problems. The weight can be applied only to the light load area, that is, the area of the order of g / cm ² is the limit, and the calibration method for the area of high load (for example, the area of the kg / cm ² order) is established. It has not been. Not only in the high load area but also in the light load area, an efficient calibration method has not been established in accordance with the need to make the pressure profile measurement sheet large and wide. In addition, it is not possible to measure all the pressure sensitive points on the entire surface of the seat at once (at once), and it is not possible to perform quick calibration.

As a means for solving such a problem, Japanese Patent Application Laid-Open No. 4-349301 (Title of Invention: Modified Conductive Elastomer) discloses a pressurizing and stretching tester as shown in FIGS. 4 and 5. An apparatus for measuring the characteristic of resistance change with respect to compressive deformation of a pressure profile measurement sheet including A is disclosed (hereinafter, referred to as "prior art 2").

[0007]

However, in the use of the apparatus of the prior art 2, it is difficult to apply a uniform pressure to the entire surface of the pressure profile measurement sheet (sample) C, and the surface management relating to the uniformity is difficult. There was a problem of taking time.

Therefore, an object of the present invention is to provide a pressure profile measuring sheet which solves the above-mentioned problems, is traceable, that is, can be calibrated retroactively to national standards, and can be implemented by simple and quick means. To provide a calibration method.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a pressure profile measuring sheet is arranged in a box body, or a pressure profile measuring sheet adhered to an inner wall of a lid of a box body is hermetically fixed in a box, and then the sheet is sealed. , Sealing the box, then
A pressure reference value serving as a calibration target and a pressure measurement value at each pressure-sensitive point of the pressure profile measurement sheet obtained by applying a pressure to the pressure profile measurement sheet by introducing a medium made of gas or liquid into the box body And compare
It is characterized in that it is calibrated to the reference value at each of all the pressure sensitive points.

[0010]

[Function] The medium (gas or liquid) introduced into the box is controlled to a constant pressure. The pressure of the medium in the sealed box uniformly acts on the entire surface of the pressure profile measurement sheet. The pressure measurement value is compared with the pressure reference value that is the calibration target, and the comparison result is used to calibrate to the reference value. The calibration can be performed at one time (all at once) by the programming of the measuring unit equipped with a computer or the like that captures the signal from the pressure profile measurement sheet, over all the pressure-sensitive points of the pressure profile measurement sheet. As a means for measuring the medium pressure, a known traceable calibration means has been established by JIS or the like, and by using this means, the calibration means by the method of the present invention becomes traceable.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

[Embodiment 1] FIG. 1 is a principle explanatory view showing an apparatus configuration according to an embodiment of a method for calibrating a pressure profile measurement sheet of the present invention. As shown in FIG. 1, a pressure profile measurement sheet 1 to be calibrated is placed in a calibration pressure enclosure box 2. A signal line 4 is connected to the pressure profile measuring sheet 1, and the signal line 4 is connected to a measuring section 5 outside the box via a sealed wiring hole 3. As the measuring unit 5, a device using a known calibration means established by JIS or the like is used. The box 2 can be sealed, and the medium (gas or liquid) 6 is pressurized and introduced into the box 2 by the booster 9. Also,
The pressure of the medium 6 can be controlled by a pressure adjusting device 7 and a calibration pressure setting device 8 installed in the introduction pipe section.

By introducing the medium 6 into the box 2 and applying a pressure to the sheet 1, the signal amount of the pressure signal can be read at one time (at once) at all the pressure sensitive points of the sheet 1.
The target pressure (reference value) to be calibrated is sequentially set by the pressure adjusting device 7 stepwise, and the target pressure (reference value) is sequentially calibrated in the measuring unit 5 at each step. The target pressure (reference value) is, for example, 20%, 40%, for one pressure profile measurement sheet.
It is set in multiple stages such as 60%, 80%, 100%.

[Embodiment 2] FIGS. 2 and 3 show an embodiment in which the design of the calibration pressure sealing box is further improved. The pressure profile measurement sheet 1 is attached to the inner wall of the lid of the pressure enclosure box 2 and hermetically fixed in the box 2. Since the pressure profile measurement sheet 1 can shape an excess fringe on the peripheral portion of the pressure sensitive portion 13, this fringe portion 10 is used as a seal body between the lid portion metal 11 and the box 2.
12 is a lid fixing metal fitting. As a result, it is not necessary to seal the lead-out hole (wiring hole) of the signal line (cable) 4, and the structure has high stability.

[0015]

As explained above, according to the present invention, the following industrially useful effects are brought about. A high load can be easily generated by pressurizing the pressure profile measurement sheet with the medium (gas or liquid) introduced into the sealed box body, and it can be temporarily (all at once) on the entire surface of the sheet (all pressure sensitive points). ) Can be pressurized. As a result, it is possible to quickly perform calibration up to a high load area that cannot be realized with a conventional weight. Even for large and wide pressure profile measurement sheets, all pressure sensitive points can be easily calibrated at once in a short time.

[Brief description of drawings]

FIG. 1 is a principle explanatory diagram showing an apparatus configuration according to a first embodiment of a method for calibrating a pressure profile measurement sheet of the present invention with a calibration pressure enclosure box partially cut away.

FIG. 2 is a principle explanatory view showing an apparatus configuration according to a second embodiment of the method for calibrating the pressure profile measurement sheet of the present invention.

FIG. 3 is a schematic plan view of FIG.

FIG. 4 is a measurement circuit diagram showing an apparatus for measuring the characteristic of resistance change with respect to compression deformation of a pressure profile measurement sheet of Prior Art 2.

5 is a schematic configuration diagram showing a specific device configuration of Prior Art 2 shown in FIG.

[Explanation of symbols]

 1: Pressure Profile Measurement Sheet 2: Calibration Pressure Enclosure Box 3: Wiring Hole 4: Signal Line 5: Measuring Section 6: Medium (Gas or Liquid) 7: Pressure Adjustment Device 8: Calibration Pressure Setting Device 9: Booster 10: Fringe Part 11: Lid part metal 12: Lid fixing bracket 13: Pressure sensitive part A: Pressurization and extension tester B: Small load converter C: Sample (pressure profile measurement sheet) D: Dynamic strain measurement device E: DC constant Voltage power supply F: Analyzing recorder G1, G2: Measuring electrode P: Pressing speed R: Standard resistor V: Voltage change

Claims (1)

[Claims] 1. A pressure profile measurement sheet is placed in a box body, then the box body is sealed, and then a medium made of gas or liquid is introduced into the box body to apply a pressure to the pressure profile measurement sheet. It is characterized in that the pressure measurement value at each pressure-sensitive point of the pressure profile measurement sheet obtained in this way is compared with a pressure reference value serving as a calibration target, and that each pressure-sensitive point is individually calibrated to the reference value. Calibration method for pressure profile measurement sheet.