JPS60179622A - Plane pressure distribution meter of roller - Google Patents

Abstract

PURPOSE:To measure accurately a pressure distribution by forming one of electrode films, which are formed on both faces of a high polymer piezoelectric film, as detecting electrode films sectioned in plural rows in the direction of the revolving shaft of a roller and in plural columns in the direction orthogonal to the revolving shaft and making current collecting electrode films conductive to detecting electrode films in plural columns. CONSTITUTION:In this plane pressure distribution meter, electrode films 2 and 3 are formed on both faces of each of two high polymer piezoelectric films 1, and the electrode film 3 on one of two films 1 is formed as detecting electrode films 311-335 sectioned in plural rows in the direction of a revolving shaft 5 of a roller 4 and in plural columns in the direction orthogonal to the revolving shaft 5. Current collecting electrode films 61-63 are so attached that they can be conductive to detecting electrode films 311-315, 321-325, and 331-335 in plural columns, and electrode films 311-315, 321-325, and 331-335 or 211-215, 221-225, and 231-235 and 311-315, 321-325, and 331-335 are allowed to face each other respectively through current collecting electrode films 61-63 or 16 to constitute a film-shaped piezoelectric body 7.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention relates to a pressure gauge for measuring pressure, and particularly to a pressure gauge for measuring pressure, and particularly for measuring pressure on the surface of paper such as grease, sheets, films, etc. This invention relates to a surface pressure distribution meter that measures and displays the surface pressure and pressure distribution on a feed roller that feeds a feed roller (referred to as a front surface of a yellow surface) in duram units in the gravity unit system.

[Conventional and prior art]

Conventional pressure gauges are generally used to measure static pressure such as atmospheric pressure, water pressure, gas pressure, etc., and measure the pressure at a certain point and display it as a representative pressure in the vicinity.

However, in order to understand phenomena caused by the kinetic energy of liquids and gases, it is necessary to measure dynamic pressure. In particular, instead of measuring dynamic pressure at a point or an area near a point, for example, when the pressure (dynamic pressure) of fluid injected from multiple nozzles varies locally due to variations in the injection amount of each nozzle, A surface pressure distribution meter that can measure dynamic pressure and pressure distribution over a wide area is required.

The present inventors developed such a surface pressure distribution meter in %
I have already filed an application under No. 37. In this surface pressure distribution meter, electrode films are formed on both sides of a polymeric piezoelectric film, and at least one of the electrode films is used as a plurality of detection electrode films defined at required intervals. It is made by bonding electrical electrodes in a conductive state, and can be applied to the measurement of dynamic pressure and pressure distribution, and has the feature that there is no need to apply a voltage from the outside.

A surface pressure distribution meter receives pressure on one side and measures the pressure distribution, so it can be inserted between the feed rollers or between the feed rollers to measure the surface pressure applied from above and below. It is not possible.

For example, when considering paper feeding in a printer, paper is inserted between the feeding rollers or between the feeding rollers, and is fed by the rotation of the feeding rollers. In this case, the paper is subjected to pressure from above and below, but if the pressure is not uniform and appropriate at each part in the axial direction of the feed roller, the paper may not be fed smoothly straight or may wrinkle and be damaged. .

Therefore, it is necessary not only to improve the surface accuracy and bearing accuracy of the feed roller and the stand, but also to correctly adjust their positional relationship. To do this, it is necessary to measure the surface pressure applied to the paper in the vertical direction and the pressure distribution in the axial direction of the feed roller (hereinafter referred to as surface pressure and pressure distribution on the feed roller).0 Such surface pressure and pressure distribution on the feed roller cannot be measured by a so-called single-sided pressure receiving type surface pressure distribution meter that measures the pressure and pressure distribution applied to one side.

The surface pressure distribution meter for the feed roller is required to be as thin as possible because it is inserted between or between the feed rollers instead of paper to measure the surface pressure and pressure distribution on the feed roller.

On the other hand, a piezoelectric film generates an electromotive force when a load is applied to it by pressing it between rolls, but the electric charge moves through the impedance on the detection side, and the electromotive force decreases over time.

Therefore, in order to measure the roll surface pressure, a mechanism is required to hold the electromotive potential during roll pinching on the detection device, and
When re-measuring, it is necessary to remove the surface pressure distribution meter from the roll and then reinsert it. The object of the present invention is to provide a thin surface pressure distribution meter that can easily and accurately measure the surface pressure and pressure distribution on a feed roller by using the piezoelectric properties of a molecular piezoelectric film. The object of the present invention is to provide a surface pressure distribution meter that generates new electromotive force one after another by sending the rollers, makes it possible to measure pressure unevenness in the rotational direction of the roll, and facilitates repeated remeasurement. [Structure of the Invention] The surface pressure distribution meter of the present invention which achieves the above object has electrode films 3 and 3 formed on both sides of a polymeric piezoelectric film, respectively, as shown in figures 1 to 3. At least one electrode film 3 of the two polymeric piezoelectric films is the rotating shaft of the Rollag! Detection electrode films 31□ to 33. are defined in multiple rows in the direction of 9 rotational axes and in multiple columns in the direction perpendicular to the axis of rotation. The plurality of rows of detection electrode films 311 to 315 t 321 to 3211
y 3111-33. The current collecting electrode films 1 to 3 are attached in a conductive state, and the opposing electrode films 311 to 3 of both polymeric piezoelectric films/321 to 4 are attached to each other in a conductive state.
+ 331-33. Or ko, 1~2Il+ +
'21~''2!l + 281~23! (See Figure 7)
and 311~311 * 321~3211 t 331
~33. The film-like piezoelectric body 7 is constructed by opposing the current collecting electrode films 1 to 3 or /A (see FIG. 7).

The current collecting electrode films 61 to 3 are the detection electrode films 311 to 31. .

321~3□! I t 3B1-33. The polymer-based piezoelectric film is attached to the current collecting electrode membrane so as to be electrically conductive, but is not bonded except for the proximal end of ~≦3, and is slidable when bent. vinylidene chloride,
Alternatively, a piezoelectric film is formed by forming and stretching a cyanovinylidene polymer into a film and then polarized, or a piezoelectric ceramic powder such as lead titanate or barium titanate is applied to a thermoplastic resin such as polyacetal, polyamide, or polyvinylidene fluoride. After mixing wires and forming into a film,
It is also possible to use a polarized material.

Among the electrode films 3 formed on both sides of two polymeric piezoelectric films, one of the electrode films 3 is used as the rotation axis of the feed roller Z! The detection electrode films 3If to 335 are defined in a plurality of rows in a direction perpendicular to the two rotational axes. It is preferable to use seven electrode films common to both electrode films, but one electrode film 3□
1-33. It is also possible to have multiple rows and multiple columns of electrode films corresponding to the respective electrodes. (See Figure 7) The size of the detection electrode is determined by the size of the roller and the number of measurement points required, but in general, it is θ in the direction perpendicular to the roller axis. 0111fA is preferably /~3°, and the width between the detection electrode films in the direction perpendicular to the roller axis is the width of the detection electrode piezoelectric film pinched by the rollers when the rollers are rotated to feed the pressure film. After the electromotive force generated by the load disappears, it is preferable to set an interval in which the next detection electrode portion piezoelectric film is pressed. Therefore, generally o, otm
sn or more, preferably 0.0! ~3IIIj11. Particularly preferably 0. /~3M.

Also, is there a heat a-blocking material on both sides of the piezoelectric film 70? What can be covered with a membrane?

The film covering the film-like piezoelectric body 7 is preferably one that has a shielding effect, is flexible, blocks heat rays, and has low thermal conductivity.

For this purpose, a thin film of a thermoplastic resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyamide, polyester, vinyl chloride, fluororesin, or a rubbery material such as polybutadiene, NiBR, ABR, etc. is preferable, and heat ray blocking is used. On the thin film as a material ♂, vapor deposition,
It is preferable to form a metal layer such as aluminum by chemical plating, adhesion, or the like. Further, in order to protect the metal layer, it is preferable that the above thin film is further laminated on the metal layer to form a sandwich structure.

In addition, the membrane body is made of the above-mentioned thermoplastic resin or rubber-like material,
It is possible to use a material obtained by adding powder of a heat ray blocking material ♂ having heat ray absorbing or heat ray reflecting properties and melting it into a film shape.

Heat ray blocking material? As for carbon black.

Aluminum powder, copper powder, etc. can be used.

Also, is there a polymer emulsion or latex in which the heat ray blocking material powder is added to both sides of a piezoelectric film or a laminated member of a piezoelectric film? Film body by applying and drying? may be formed.

A film body to which heat ray blocking material powder is added cannot be expected to have a shielding effect, so it is suitable for cases where the electrode film also serves as a shield, as shown in Figures 2 and 3. When constructed using a material such as copper, it has a heat ray blocking and shielding effect.

The thickness of the surface pressure distribution meter of the present invention is 300 mm considering the thickness of paper etc.
Based on the thickness of ttU+ or less, it is possible to deal with this by changing the number of layers of the piezoelectric film 7 depending on the thickness of the paper or the like.

[Configuration of First Embodiment] Hereinafter, embodiments of the surface pressure distribution meter of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a partially exploded perspective view showing the structure of the first embodiment of the surface pressure distribution meter of the present invention, and Fig. 2 is a cross-sectional view thereof. It was difficult to make the film thinner (
/θOμm), can be made into a large area, has flexibility unique to glasstics, and has excellent moldability.

First Example 1: An aluminum electrode film was formed on one side of Mako's polymeric piezoelectric film by vapor deposition, and a layer of heat ray blocking material was further interposed on the electrode film λ, which also served as a shield. At the same time as coating the film body 2, the other side of the nuclear engineering film/ is in the direction of the rotation axis j of the feed roller rough! Detection electrode films 38 defined in three rows in the 1α angle direction with the rotation axis O in the row 9,
335 is formed by a vapor deposition method. 2 such parts
Three rows of detection electrode films 311 to 3I of these members are used.
II t 1 between 321 and 3211 + 33□ and 331 on current collecting electrode films such as aluminum foil and phosphor bronze foil, respectively.
~6. It becomes attached.

The electrode films 3 and 3 in the present invention can be formed using an appropriate method such as etching or by adhering metal foil such as aluminum foil.

The current collecting electrode films 1 to 3 are provided so that even if the detection electrode films 311 to 3 are cut and divided into a plurality of parts, a voltage signal based on the charge amount and pressure on the membrane surface can be taken out. Therefore, it is preferable to use a material such as phosphor-backed copper that has greater mechanical strength and elasticity than the detection electrode film, and preferably has a thickness of about 10 to 3θθμm.

In addition, since the thickness of the surface pressure distribution meter of the present invention can be made as thin as 300 μm or less, it is sufficient to provide the film body 2 for blocking heat rays on both sides of the film-like piezoelectric material 7 formed by laminating two piezoelectric films. However, a membrane body may be provided so as to house the membrane piezoelectric body 7 therein.

In order to measure the surface pressure and pressure distribution on the feed roller with the surface pressure distribution meter of the present invention configured as described above, for example, one piezoelectric film/aluminum electrode film λ is connected to a common electrode as shown in Figure 3. By inserting the surface pressure distribution meter of the present invention between the feed roller rack and Z and moving it back and forth as shown in Fig. 7 (the same applies when moving back and forth between the feed roller and the stand), The surface pressure applied in the vertical direction from the feed roller ¥4t is received by the upper and lower membrane bodies, and the detection electrode membranes in 3 rows of 2 piezoelectric films 3It to 3Ill + 321
〜32舊−331〜33、The surface pressure of each pressure receiving part? An electrical signal (E-force signal) proportional to this can be extracted through the current collecting electrode films B, - B, and so on.

Since the surface pressure distribution meter of the present invention electrically outputs high impedance in the low frequency range, when each pressure signal is processed by a signal processing device with low impedance input, each current collecting electrode is Connect impedance converters (matching lug) lO7 to tosf to membranes 1 to 3,
Each pressure signal obtained from this can be processed by the signal processing device//D The magnitude of each pressure signal can be processed by the signal processing device//
By measuring with /, it is possible to know the surface pressure and pressure distribution at each part in the axial direction of the feed roller lug.

In the case of the first embodiment, since the detection electrode film 3 is divided into three rows and three columns, it is possible to know the surface pressure and pressure distribution at the left, right and center parts of the feed roller Z. If the number of divisions is arbitrary, it is possible to know the surface pressure and pressure distribution of the desired division.

[Operations and effects of the first embodiment] Next, the operations will be explained. When the surface pressure distribution meter of the present invention is moved back and forth with the feed roller lug 4 inserted between them as shown in Figure 9, compressive stress and bending stress act on the upper and lower membrane bodies, and the surface pressure of each pressure receiving part increases! Each detection electrode film 31 divided into rows and three columns
1-381, 321-3g, 3,1-3. It is detected as an electrical signal and extracted from 1 to 2 to each current collecting electrode film. Each pressure signal is transmitted through an impedance converter 1o1
-io, is input to the signal processing device l/, is amplified and then processed to determine the surface pressure value of each pressure receiving part.

These surface pressure values will be equal if the surface pressures of the left, fabric, and center portions of the feed roller lug are equal, and will be different if these surface pressures are different. In this way, the surface pressure and pressure distribution on the left, right, and center portions of the feed roller lug can be measured.

In this case, since the membrane piezoelectric body 7 is electrostatically shielded by the electrode films (earth electrodes) 2jF- on both sides, it is not only not affected by external electric fields, but also has a layer of heat ray blocking material ♂. Since it is covered with a film body, the detection electrode film 3
1. It is possible to greatly reduce the addition of noise due to electrostatic induction and signals due to temperature changes to the electrical signal obtained from ~j85. In addition, since the signal due to a slight temperature change due to heat transmitted through the film body W having a layer of heat ray blocking material r becomes an extremely low frequency signal, a filter circuit is provided to cut this low frequency. This can be completely removed by keeping it in place.

Therefore, since only the signal due to the true surface pressure is detected, the surface pressure and pressure distribution can be measured accurately.

Note that if there is no risk of being affected by an external electric field, there is no need to ground the electrode film 2 or the layer with the heat ray blocking material. Invinidance converter io1~10. Just connect it to the input end of

[Configuration of Second Embodiment] FIG. 5 is a partially exploded perspective view showing the main parts of the configuration of the second embodiment, and FIG. 3 is an external view thereof.

This U-shaped embodiment has a U-shaped notch 12 at the front end. An insulating film such as a sheet of glass is used at the rear end to form a hole for an impedance converter. A polymeric piezoelectric film is placed in each of the U-shaped notches 12 of the two insulating films, and the rotation axis of the feed roller lag is placed on the opposing surface of each polymeric piezoelectric film. In the direction of! Row 1 rotation axis! Detection electrode films 3□, ~33.
form. Each of these polymer-based IEs! Detection of three rows of film/electrode films 311-31I+, 321-3211j
331~33! Between I/Impedance converter hole 13
Current collecting electrode film made of phosphor bronze foil with a length that reaches 6□
These are attached via ~g3, and a phosphor bronze foil plate/S having the same shape as the insulating film/4t is attached to both or one side thereof. At the front end of this laminate, an electrode film 2 made of phosphor bronze foil is adhered to the other surface of each piezoelectric film to form a membrane piezoelectric body 7, and both sides of the membrane piezoelectric body 70 are covered with a membrane body. It becomes.

Then, the impedance converters io, ~103 are arranged in the impedance converter holes 13 of the laminate and integrated, and the piezoelectric film/electrode film 2 is connected to form a common ground electrode, and each current collector Each impedance converter io, 103 is connected to each electrode film, and a signal processing device // is further connected to the impedance converter 103.

(See FIG. 3) [Operations and Effects of Second Embodiment] This second embodiment also has the same functions and effects as those of the first embodiment. %, this second embodiment is a phosphor bronze foil plate/,
Since S is attached, the feed roller lag.

Insertion into the Z space or between the feed roller and back-and-forth movement operations are extremely easy. In addition, since the film-like piezoelectric body 7 has a structure in which it is enclosed by the phosphor bronze foil plates 1 and 1 and the electrode film, the electrostatic shielding effect is improved and the effect of preventing noise from entering due to electrostatic induction is ensured. can do.

C Configuration of Third Embodiment] Figure 7 is a perspective view showing the main parts of the configuration of the third embodiment, Figure 7 is a cross-sectional view thereof, and Figure 7 is a part of a measurement system using the third embodiment. FIG.

In this third embodiment, two polymeric piezoelectric films are placed on both sides of the film, and together with the rotating shaft of the feed roller lag.
In the direction of! Row 2 rotation axis! The film-like piezoelectric material 7 is divided into three rows in the perpendicular direction to ! Divide into rows and 3 columns. These film-like piezoelectric bodies 711 to 73. One piece of piezoelectric film that makes up /1
1~/3. 21. opposing electrode films; ~23. and 3,1
~33. Current collecting electrode film 1 made of common glue/bronze foil plate
6, and is bonded in a conductive state. This current collecting electrode film 16 too! It may be divided into rows and three columns.

The other three rows of electrode films 311-'15*321-3211+31 of the two piezoelectric films/It~/8M
11~335 and 12II'''15 y221~45
y 2B, ~235 are respectively used as a detection electrode film and a ground electrode, and these three rows of detection electrode films 3.1 to 38. .

321~3211 + 3sl~33. The current collecting electrode films g1 to 3 are attached in a conductive state.

Each membranous pressure body 72, - 73. The electrostatic shielding film/7 and each earth electrode 211~'s are packaged with a film body having an insulating film holding the electrostatic shielding film/7 and a heat shielding material covering the upper surface thereof.
s to ground, 3 rows of detection electrode films 311 to 3si +
'21~325 + 331~33. Impedance converters 101 to 103 are connected between the ground and ground, respectively.

[Operations and effects of the third embodiment] This third embodiment is similar to the first embodiment described above. In the second embodiment, two piezoelectric films are arranged in five rows and three columns of detection electrode films 31. ~33
．． In response to! Row, 3rd column portion 711-/8. By dividing the film-like piezoelectric material 7 into three rows of parts 711 to 78.
These three rows of film-like piezoelectric bodies 7. .

~7Ill * 721~72! l #7U~73.
Since the only change is the extraction of the pressure signal obtained from the first. It is clear that this embodiment is the same as the λth embodiment and has the same effects.

[G. Example]

Furthermore, in the first to third embodiments, a plurality of membrane piezoelectric bodies may be laminated, and a plurality of rows of current collecting electrode films of the laminated membrane piezoelectric bodies may be connected in series.

In this third embodiment, the number of laminated sheets is determined according to the thickness of the paper, etc., so that surface pressure and pressure distribution can be measured depending on the thickness of the paper, etc. Also, the output voltage can be increased and the pyroelectric property can be measured. It is possible to increase the effect of preventing the influence of

〔Effect of the invention〕

As is clear from the detailed description of the above embodiments, according to the present invention, electrode films 3 are formed on both sides of two polymeric piezoelectric films, and this single polymeric piezoelectric film is At least one of the electrode films 3 of the system piezoelectric film is fed in the direction of the rotation axis j in multiple rows with two rotation axes! Detection electrode films 31□ to 33. are defined in multiple rows in a direction perpendicular to . and the plurality of rows of detection electrode films 31. ~43,3°, ~32
! Is 3B1-33. 4. Electrode film for current collection. ~≦3 is attached in a conductive state, and the opposing electrode film 31. ~3Ill m 3□,
~32! + + 331-33. Or 2□1~'1
! ＋? '21-2211 +, 2Ill~2 parts and 311~315 $ 321~3□1,33□~33.
Since the basic structure is a surface pressure distribution meter of a roller, which is formed by contacting each other via a current collecting electrode film B, ~63 or /6 to form a membrane piezoelectric material 7, the surface pressure at the roller Z is Also, the pressure distribution can be easily and accurately measured.

[Brief explanation of drawings]

Fig. 1 is a partially exploded perspective view showing the configuration of the first embodiment of the surface pressure distribution meter of the present invention, Fig. 2 is a cross-sectional view thereof, and Fig. 3 is a connection diagram of a measurement system using the first embodiment. , Fig. 3 is an explanatory diagram when measuring surface pressure and pressure distribution using the first embodiment. The figure is a partially exploded perspective view showing the configuration of the main part of the third embodiment, Fig. 3 is an external view thereof, Fig. 7 is a perspective view showing the main part of the structure of the third embodiment, and Fig. The cross-sectional view and FIG. 2 are connection diagrams of a part of the measurement system using the third embodiment. '+'11~/3. ...Polymer-based piezoelectric film, λ,
211~J6+3...electrode film, 31□~3o...
・Detection electrode membrane, G... (feed) roller,! ...Rotating shaft, Otsu, ~Otsu,, 16...Electrode film for current collection, 7*711~
78. ...Membrane piezoelectric material, and heat ray blocking material?・
... Membrane body, io1~103 ... Impedance converter, // ... Signal processing device, 17 ... Electrostatic seal should be in front of Minato 3

Claims (1)

[Claims] (1) Electrode films are formed on both sides of a polymer piezoelectric film, and at least one electrode film of the polymer piezoelectric film is arranged in multiple rows in the direction of the rotation axis of the roller and in multiple rows in a direction perpendicular to the rotation axis. A roller surface pressure distribution meter (
2) The surface pressure distribution meter for a roller according to claim 1, wherein the polymeric piezoelectric film is divided into multiple rows and multiple columns corresponding to the multiple rows and multiple columns of detection electrode films.