JP2010078351A - Bending characteristic measuring device and method for measuring bending characteristic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure bending characteristics of a sheet-shaped member according to the environment. <P>SOLUTION: In a bending characteristic measuring device 10, a measurement chamber 102 is formed by covering the upper surface of a substrate 22 with a case 100. In the measurement chamber, a fixed clamp 24 and a moving clamp 26 are provided, and a measurement sample S is gripped by the fixed clamp and the moving clamp to be held. Air generated by a humidity-controlled air generating device is supplied to the measurement chamber and a panel heater 108 for heating air in the measurement chamber is provided. With this structure, the bending characteristic measuring device can measure bending characteristics of the measurement sample with the temperature and humidity in the measurement chamber maintained at desired levels. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bending property test apparatus and a bending property measurement method.

  In the test and measurement of bending stiffness for sheet-like materials such as paper, paperboard, film, etc., the “JIS-P8125” is a Clark tester that measures recovery force from the bending state shown in “TAPPI test method T451”. There is a taper tester using the cantilever shown, and a Gurley tester shown in “JTAPPI test method No. 40”.

On the other hand, in Patent Document 1, a sheet-like member to be measured is gripped by a fixed clamp and a moving clamp, and the moving clamp is moved along a predetermined locus while the fixed clamp is moved via the sheet-like member at that time. A bending characteristic tester that detects a rotational torque acting on the sheet as a bending moment of a sheet-like member is disclosed.
Japanese Patent Publication No. 06-70607

  The present invention provides a bending characteristic measuring apparatus and a bending characteristic measuring method capable of measuring a bending characteristic by changing a temperature around a sheet-like member in a housing.

  In order to achieve the above-described object, the present invention holds the sheet-like member by holding both ends in the direction intersecting the vertical direction of the sheet-like member with a pair of holding portions, and the sheet-like member is curved. One of the pair of holding portions is relatively moved along a plane intersecting the vertical direction with respect to the other, and is relatively rotated around an axis along the vertical direction. A bending characteristic measuring unit that measures the received rotational torque as a bending characteristic, a casing that integrally covers the sheet-like member and the pair of holding parts that hold the sheet-like member, and air in the casing are heated to perform air conditioning. Air conditioning means to perform, and air conditioning control means for controlling the operation of the air conditioning means.

  The bending property measuring apparatus according to claim 1, wherein the air conditioning unit includes humidity control unit that can adjust humidity in the casing by humidifying or dehumidifying air in the casing, Air conditioning control means controls the operation of the humidity control means.

  According to a third aspect of the present invention, in the bending characteristic measuring apparatus according to the first or second aspect, the air conditioning means includes a plate-like heating element provided on the inner surface of the casing as a heating means.

  According to a fourth aspect of the present invention, in the bending characteristic measuring apparatus according to any one of the first to third aspects, a pair of support shafts in which one of the pair of holding portions protrudes in the vertical direction, and the support shaft Bearing means for rotatably supporting one side, a torque sensor for detecting the rotational torque, a connecting member for connecting the torque sensor to the other of the support shafts protruding from the housing, and cooling the connecting member Cooling means.

  According to a fifth aspect of the present invention, in the bending characteristic measuring apparatus according to the fourth aspect, the connecting member and the support shaft are connected to be movable in the axial direction.

  According to a sixth aspect of the present invention, in the bending characteristic measuring apparatus according to any one of the first to fifth aspects, the housing is formed of a heat insulating material.

  According to a seventh aspect of the present invention, in the bending characteristic measuring apparatus according to any one of the first to sixth aspects, the casing includes a stirring unit that stirs the air in the casing.

  According to an eighth aspect of the present invention, in the bending characteristic measuring device according to the seventh aspect, the stirring means generates a flow of air along the vertical direction in the casing.

  The bending characteristic measuring method according to the present invention is the bending characteristic measuring apparatus according to any one of claims 1 to 8, wherein an upper end portion of the sheet-like member is held by the pair of holding portions. A temporary holding part is provided, the sheet-like member is held by the temporary holding part, air conditioning in the casing is started by the air conditioning means, and the inside of the casing is in a preset air conditioning state, The sheet-like member is held by the pair of holding portions, and the bending property of the sheet-like member is measured by the bending property measuring unit.

  According to the first aspect of the invention, the bending characteristics can be measured by changing the temperature around the sheet-like member in the housing.

  According to the second aspect of the invention, the bending characteristics can be measured by changing the temperature and humidity around the sheet-like member in the housing.

  According to the invention of claim 3, as compared with the case where the present configuration is not provided, efficient heating is possible in a narrow space in the casing.

  According to the fourth aspect of the present invention, when the torque sensor is connected to the support shaft of the holding portion, it is possible to suppress the heat in the housing from being transmitted to the torque sensor.

  According to the fifth aspect of the present invention, it is possible to prevent the load of the torque sensor from increasing even if the support shaft is thermally expanded.

  According to the sixth aspect of the present invention, it is possible to suppress the inside of the housing from being affected by the ambient temperature as compared with the case where the present configuration is not provided.

  According to the seventh aspect of the present invention, it is possible to reduce unevenness in the temperature and humidity of the air in the housing as compared with the case where this configuration is not provided.

  According to the eighth aspect of the present invention, it is possible to suppress the flow of air in the housing from affecting the bending of the sheet-like member as compared with the case where this configuration is not provided.

  According to the invention of claim 9, it is possible to prevent the sheet-like member from being wrinkled or bent when measuring the bending characteristics.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a main part of a bending property measuring apparatus 10 according to the present embodiment. The bending property measuring apparatus 10 includes a gantry 12, and a bending property measuring unit (hereinafter referred to as a measuring unit 16) is provided on a top plate 14 of the gantry 12. The bending property measuring apparatus 10 includes a power supply unit 18 and a control unit 20. For example, the power supply unit 18 and the control unit 20 are accommodated in the gantry 12.

  As shown in FIGS. 1 and 3, the top plate 14 is provided with a substrate 22, and the measurement unit 16 is disposed on the substrate 22. As shown in FIG. 3 and FIG. 4, the measurement unit 16 is provided with a pair of a fixed side holding unit and a moving side holding unit as a holding unit. Here, the fixed clamp 24 is used as the fixed side holding portion, and the moving clamp 26 is used as the moving side holding portion. The fixed clamp 24 and the moving clamp 26 are disposed on the substrate 22 (not shown in FIG. 4).

  In the fixed clamp 24, a holding member 30 is attached to a strip-shaped base portion 28, and support shafts 32A and 32B (hereinafter, collectively referred to as the support shaft 32) are coaxially connected to both ends in the longitudinal direction of the base portion 28. Attached.

  The fixed clamp 24 has the support shaft 32 </ b> A on the side of the substrate 22, and is disposed along the direction in which the longitudinal direction of the base portion 28 intersects the surface of the substrate 22. The substrate 22 is provided with a pivot bearing 34, and the fixed clamp 24 has a support shaft 32 </ b> A supported by the pivot bearing 34.

  The pivot bearing 34 is formed using a material such as stainless steel, and the support shaft 32A is inserted into the pivot bearing 34 so as to be prevented from moving downward and supported rotatably. As a result, the fixed clamp 24 is rotatable about the support shaft 32 on the substrate 22 and can move in the direction of extraction from the pivot bearing 34.

  As shown in FIG. 1, a leg portion 36 is erected on the top plate 14 adjacent to the substrate 22, and an arm portion 38 is attached to the leg portion 36. The arm portion 38 is disposed along the upper surface of the substrate 22 such that the tip portion is on the substrate 22.

  In the measurement unit 16, a torque sensor 40 is used as detection means, and the torque sensor 40 is attached to the arm portion 38. The torque sensor 40 outputs an electrical signal corresponding to the rotational moment (rotational torque) received by the rotary shaft 40A (see FIG. 3).

  As shown in FIG. 3, the torque sensor 40 has a rotating shaft 40 </ b> A directed toward the substrate 22. A support shaft 32B of the fixed clamp 24 is connected to the rotation shaft 40A of the torque detector 40 via a connecting member 42. The connecting member 42 includes a fixing member 42A connected so as to rotate integrally with the rotation shaft 40A of the torque sensor 40 inserted therein, and a fixing member 42B into which the support shaft 32B of the fixing clamp 24 is inserted. 42A and the fixing member 42B are connected so as to rotate integrally.

  As a result, the torque detector 40 rotates the rotating shaft 40 </ b> A integrally with the fixed clamp 24, and an electrical signal corresponding to the rotational moment acting on the fixed clamp 24 is output. When the fixed clamp 24 is rotated about the support shaft 32, the measuring unit 16 measures the rotational torque received by the fixed clamp 24 by the torque detector 40.

  The fixing member 42B rotates integrally with the support shaft 32B, but the support shaft 32B can move along the axial direction.

  On the other hand, as shown in FIGS. 3 and 4, the moving clamp 26 includes a band plate-like base portion 44, and a holding member 46 is attached to the base portion 44. Further, the base 44 is provided with a base 48 on one end side in the longitudinal direction, and a back plate 50 is connected to one end side in the width direction.

  The moving clamp 26 has a configuration in which the base 44 and the back plate 50 are erected integrally so that the longitudinal direction of the base 44 intersects the surface of the substrate 22 and the base 48 is on the substrate 22 side. It has become.

  As shown in FIGS. 1 and 3, the gantry 12 is provided with a moving stage 52 on the lower surface side of the top plate 14. The moving stage 52 is movable relative to the top plate 14 along the lower surface of the top plate 14.

  As shown in FIG. 3, an opening 54 having a predetermined shape is formed in the top plate 14 and the substrate 22. The moving clamp 26 has a base 48 disposed in the opening 54 and fixed at a predetermined position on the moving stage 52. Thereby, the moving clamp 26 is moved integrally with the moving stage 52 within the opening 54.

  As shown in FIG. 1, the gantry 12 is provided with a stage drive unit 56 below the top plate 14. The moving stage 52 is supported by the stage driving unit 56. As shown in FIG. 5, the stage drive unit 56 is provided with a motor 58. The motor 58 has a drive shaft 58 </ b> A coupled to the lower surface of the moving stage 52. Accordingly, the moving stage 52 is rotated relative to the top plate 14 around the rotation shaft 58A of the motor 58 by driving the motor 58 (hereinafter, the motor 58 is referred to as a rotation motor 58).

  Further, the stage driving unit 56 uses shaft moving units 60 and 62 as moving means. The shaft moving units 60 and 62 have a general configuration including, for example, a long main body 64 provided with a feed screw mechanism and moving motors 66 and 68 connected to one end side in the longitudinal direction of the main body 64. Yes. In the shaft moving units 60 and 62, the feed screws (not shown) are rotated by driving the moving motors 66 and 68, and the moving plates 60 </ b> A and 62 </ b> A are moved along the longitudinal direction of the main body 64.

  The axis moving parts 60 and 62 are arranged so as to overlap each other in the longitudinal direction. At this time, the main body 64 of the upper shaft moving unit 62 is attached on the moving plate 60A of the lower shaft moving unit 60. Further, the above-described rotation motor 58 is mounted on the moving plate 62A of the upper shaft moving unit 62.

  The stage driving unit 56 moves the moving clamp 26 integrally with the moving stage 52 by driving of the moving motors 66 and 68. At this time, the moving stage 52 is moved together with the moving clamp 26 at a moving amount corresponding to the rotation speed of the moving motors 66 and 68 and a speed corresponding to the rotation speed (the rotation speed per unit time).

  Here, as shown in FIGS. 5 and 6, in the bending characteristic measuring apparatus 10 applied to the present embodiment, for example, the moving direction of the moving clamp 26 by the shaft moving unit 60 is the Y-axis direction, and the shaft moving unit 62. The moving direction of the moving clamp 26 by the X direction is taken as the X axis direction, and the rotating direction of the moving clamp 26 by the rotation motor 58 is taken as the θ direction.

  As shown in FIG. 6, the measurement unit 16 controls the driving of the rotation motor 58 and the movement motors 66 and 68 to determine the inside of the opening 54 in advance while changing the direction of the movement clamp 26 with respect to the fixed clamp 24. It is moved in the Y-axis direction and the X-axis direction along the movement trajectory.

  In the present embodiment, the movement of the moving clamp 26 in the X-axis direction and the Y-axis direction is not limited to the above. For example, the moving clamp 26 rotates with respect to the fixed clamp 24 and the moving clamp 26 with respect to the fixed clamp 24. A known configuration that moves in the X direction, the Y direction, and the rotation direction can be applied, for example, in combination with the movement in the contact / separation direction.

  On the other hand, in the bending characteristic measuring apparatus 10, the measuring unit 16 and the control unit 20 are operated by electric power supplied from the power supply unit 18 to the control unit 20. FIG. 7 shows a main part of the control unit 20.

  A main controller 70 is used for the control unit 20. The main controller 70 is a storage device such as a CPU 72A, RAM 72B, ROM 72C, and HD (hard disk) 72D, a display device 72E such as a monitor, an input device 72F such as a keyboard, and various input / output (I / O) ports 72G. It is formed including a computer having a general configuration connected by 68H. The main controller 70 performs data processing based on programs stored in the ROM 72C, HD 72D, etc., data transmission / reception and data processing using various input / output interfaces.

  The control unit 20 may be configured such that a personal computer (PC) or the like is used as the main controller 70 and the personal computer is connected to the control unit 20 as the main controller 70.

  The control unit 20 includes a stage controller 74, and this stage controller 74 is connected to the main controller 70. The stage controller 74 is provided with drive circuits 76A, 76B, and 76C, and the rotation motor 58 and the movement motors 66 and 68 of the stage drive unit 56 are connected to the drive circuits 76A, 76B, and 76C.

  As the rotation motor 58 and the movement motors 66 and 68, a motor capable of controlling the operation amount and detecting the operation amount, such as a stepping motor and a pulse motor, is used. The stage controller 74 includes the rotation motor 58 and the movement motor. Detectors 78A, 78B, and 78C that detect movement amounts 66 and 68 are provided.

  The main controller 70 controls the movement and rotation of the moving clamp 26 by controlling the operation of the rotation motor 58 and the movement motors 66 and 68. At this time, the main controller 70 detects the operation amounts of the rotation motor 58 and the movement motors 66 and 68, and performs feedback control of the rotation motor 58 and the movement motors 66 and 68.

  The measuring unit 16 is provided with a torque amplifier 80A and an A / D converter 80B, and the torque sensor 40 is connected to the main controller 70 via the torque amplifier 80A and the A / D converter 80B. The main controller 70 measures the rotational torque detected by the torque sensor 40 while controlling the driving of the rotation motor 58 and the movement motors 66 and 68.

  Here, in the bending property measuring apparatus 10 applied to the present embodiment, a sheet-like member such as paper, paperboard, film, cloth, or woven fabric is used as a measurement target (hereinafter, measurement sample S), and the bending property of the measurement sample S is measured. measure.

  As shown in FIGS. 3 and 4, in the measurement unit 16, the measurement sample S is held by a fixed clamp 24 and a moving clamp 26. At this time, the fixed clamp 24 holds and holds a predetermined length (for example, the entire region) along the longitudinal direction of one end portion in the width direction of the measurement sample S by the base 28 and the holding member 30. A predetermined length (for example, the entire region) along the longitudinal direction of the other end in the width direction of the measurement sample S is held and held by the base 44 and the holding member 46.

  Here, the “longitudinal direction” does not necessarily indicate the direction of the long side of the measurement sample S. In addition, here, the portion gripped by the base portion 28 and the holding member 30 is “the end in the width direction, and the direction intersecting the width direction is the“ longitudinal direction ”.

  In the bending characteristic measuring apparatus 10, the holding member 30 of the fixed clamp 24 includes a temporary holding unit 30A and a holding unit 30B, and the holding member 46 of the moving clamp 26 includes a temporary holding unit 46A and a holding unit 46B. When forming the bending property of the measurement sample S with the bending property measuring apparatus 10, first, temporarily hold a part in the longitudinal direction of the measurement sample S using the temporary holding portions 30A and 46A, and at a predetermined timing, The measurement sample S is held using the temporary holding unit 30A, the holding unit 30B, the temporary holding unit 46A, and the holding unit 46B.

  In the fixed clamp 24, the width direction tips of the base portion 28 and the holding member 30 are on the support shaft 32, and in the moving clamp 26, the width direction tips of the base portion 44 and the holding member 46 are on the rotation shaft 58A of the rotation motor 58. It has become.

  As shown in FIG. 6, the tip positions of the base 28 and the holding member 30 of the fixed clamp 24 are set as a fixed axis Fp, and the tip positions of the base 44 and the holding member 46 of the moving clamp 26 are set as a moving axis Mp.

  Here, in the bending characteristic measuring apparatus 10, the measurement axis | shaft S is curved by fixing the fixed axis Fp and moving the movement axis Mp. At this time, the main controller 70 controls the operation amounts of the movement motors 66 and 68 to move the movement clamp 26 with respect to the fixed axis Fp so that the movement locus of the movement axis Mp becomes an arc shape ( Hereinafter, it is referred to as revolving movement). At the same time, the main controller 70 controls the operation amount of the rotation motor 58 to rotate the movement axis Mp in accordance with the movement of the movement axis Mp (hereinafter referred to as rotation). In the following description, the movement of the movement clamp 26 is referred to as the movement of the movement clamp 26, and the rotation of the movement clamp 26 about the movement axis Mp is referred to as the rotation of the movement clamp 26.

In the main controller 70, the fixed axis Fp is the origin Q on the plane coordinates (XY coordinates), and the position of the moving axis Mp that is the measurement start position (solid line position shown in FIG. 6) of the bending characteristic with respect to the measurement sample S is the original. It is set as the position P ₀ (X ₀ , Y ₀ ). This original position P ₀ is the length of the measurement sample S on the Y axis with respect to the origin Q (the interval between the fixed axis Fp and the moving axis Mp shown in FIG. 3 and the span length L shown below). It becomes the position according to.

As shown in FIG. 7, the measurement unit 16 is provided with an original position detection unit 82 that detects that the moving clamp 26 has moved to the original position P ₀ , and the original position detection unit 82 serves as the main controller 70. It is connected to the. Thus, the main controller 70, moving shaft Mp is made possible of detecting whether in situ P _0. The original position P ₀ is a position on the Y axis corresponding to the span length L of the measurement sample S, and the original position detector 82 determines whether the moving clamp 26 (moving axis Mp) is at the original position P ₀ . Any configuration that can detect whether or not the moving clamp 26 is in the initial state may be used. The initial state of the moving clamp 26 is such that the base 44 and the holding member 46 face the fixed clamp 24 when the moving clamp 26 is moved on the Y axis (original position P ₀ ).

  In the bending characteristic measuring apparatus 10, when the bending characteristic of the measurement sample S is measured, a state (pure bending) in which the measurement sample S is curved in an arc shape is maintained. At this time, the main controller 70 moves the moving clamp 26 in the X-Y-θ direction so that the pure bending state of the measurement sample S is maintained, and the bending of the measurement sample S in the fixed clamp 24. Measure the relationship with the moment.

Here, the span length that is the length of the curved portion of the measurement sample S is L, the curvature of the measurement sample S is K, the coordinates of the original position P ₀ that is the initial position of the moving clamp 26 are (X ₀ , Y ₀ ), The coordinates of the position P on the moving axis Mp when the moving clamp 26 is moved are (X, Y), and the rotation angle of the moving clamp 26 is θ (θ = θ ₀ at the initial position).

  The coordinates (X, Y) of the position P of the movement trajectory M of the movement axis Mp of the movement clamp 26 when maintaining the pure bending of the measurement sample S and the rotation angle θ of the movement clamp 26 at the position P are (1). It represents with Formula, (2) Formula, and (3) Formula.

X = (1-Cosθ) / K (1)
Y = (Sinθ) / K (2)
θ = L · K (3)
The main controller 70 sets the movement trajectory M by performing calculations and the like, and is detected by the torque sensor 40 while controlling the driving of the rotation motor 58 and the movement motors 62 and 66 so as to be the set movement trajectory. Measure the rotational torque.

  On the other hand, in the bending characteristic measuring apparatus 10 applied to the present embodiment, the moving clamp 26 moves within the opening 54 formed in the top plate 14 and the substrate 22 (an example is shown by a two-dot chain line in FIG. 6). Is done. In the main controller 70, a moving range of the moving clamp 26 is set in accordance with the opening 54, and the moving clamp 26 is moved within this moving range.

  By the way, as shown in FIGS. 1 and 2, the bending characteristic measuring apparatus 10 applied to the present embodiment is provided with a box-shaped casing 100. The housing 100 is attached so that one surface is opened and this surface faces the substrate 22 so as to cover the substrate 22. Here, in the present embodiment, one surface around the casing 100 excluding the opening surface is the front wall 100A, the surface facing the front wall 100A is the back wall 100B, and one surface in contact with the front wall 100A and the back wall 100B. The side wall 100L, the other surface as the side wall 100R, the surface facing the substrate 22 as the ceiling 100C, and the inside of the housing 100 as the measurement chamber 102 will be described.

  The fixed clamp 24 has a support shaft 32 </ b> B protruding upward from the ceiling 100 </ b> C of the housing 100. The torque sensor 40 is disposed with the rotation shaft 40A facing the support shaft 32B.

  The housing 100 has a thermal conductivity λ of the front wall 100A, the back wall 100B, the side walls 100L and 100R, and the ceiling 100C, for example, 0.01 W / (m · K) ≦ λ ≦ 1.00 W / (m · K). Insulation material is used. Thereby, the inside of the measurement chamber 102 is prevented from being affected by the temperature and humidity of the installation environment of the bending property measuring apparatus 10.

  The thermal conductivity λ of the heat insulating material used for the front wall 100A, the back wall 100B, the side walls 100L and 100R, and the ceiling 100C is 0.01 W / (m · K) ≦ λ ≦ 1.00 W / ( m · K) can be used, but preferably 0.01 W / (m · K) ≦ λ ≦ 0.50 W / (m · K), and further 0.01 W / (m · K) ≦ λ ≦ 0. 25 W / (m · K) is preferable. In the bending characteristic measuring apparatus 10, the upper surface of the moving stage 52 to which the moving clamp 26 is attached (the surface facing the lower surface of the top plate 14) is formed of a heat insulating material. As the thermal conductivity λ of this member, 0.01 W / (m · K) ≦ λ ≦ 1.00 W / (m · K) can be used in consideration of heat insulation properties. Preferably, 0.01 W / ( m · K) ≦ λ ≦ 0.50 W / (m · K), more preferably 0.01 W / (m · K) ≦ λ ≦ 0.25 W / (m · K).

  The front wall 100A is connected to one of the side wall 100L or the side wall 102R via, for example, a hinge (not shown), and thereby the inside of the measurement chamber 102 can be opened by opening the front wall 100A. Further, as shown in FIG. 3, an inspection window 102A is provided on the front wall 100A, and an inspection window 102B is provided on the ceiling 100C. The inspection windows 102A and 102B are formed using a transparent material having a heat insulating property (low thermal conductivity) using a heat insulating material, and thus, even when the front wall 100A is closed, Visual recognition in the measurement chamber 102 is possible.

  On the other hand, as shown in FIG. 1, the bending characteristic measurement device 10 includes a humidity-controlled air generation device 104. For example, the humidity control air generation device 104 is accommodated in the gantry 12 and is operated by electric power supplied from the power supply unit 18.

  One end of a vent pipe 106 is connected to the humidity-controlled air generator 104, and the other end of the vent pipe 106 is connected to the side wall 100 </ b> L of the housing 100 and opened in the measurement chamber 102.

  The humidity-controlled air generation device 104 can generate humidified air and dehumidified low-humidity air, and the bending characteristic measuring device 10 supplies the air into the measurement chamber 102. As such a humidity control air generation device 104, for example, air is supplied into a heated liquid such as hot water, and high-humidity air is generated by collecting the air humidified by foaming in the liquid. It is possible to generate high-humidity air and low-humidity air, including a mechanism and a mechanism that generates low-humidity air by performing heat exchange between a cooling refrigerant such as cooling water and air. The following configuration can be applied.

  In the bending characteristic measuring apparatus 10, humidity adjustment such as humidification or dehumidification in the measurement chamber 102 is performed by supplying the air generated by the humidity control air generation apparatus 104 into the housing 100. Note that the housing 100 is provided with an exhaust port (not shown) provided with a check valve or the like, and surplus air is supplied by supplying air from the humidity control air generation device 104 into the measurement chamber 102. Is discharged out of the measurement chamber 102.

  As shown in FIGS. 2 and 3, the bending characteristic measuring apparatus 10 uses a panel heater 108 as a heating unit, and the panel heater 108 is provided in the housing 100. The panel heater 108 is attached to the three surfaces of the back wall 100B and the side walls 100L and 100R via the heat shield 110.

  As shown in FIG. 7, a humidity control air generator 104 is connected to the main controller 70. Further, the controller 20 is provided with a temperature controller 112, and the temperature controller 112 is connected to the main controller 70. A panel heater 108 and a temperature / humidity sensor 114 are connected to the temperature controller 112.

  The temperature controller 112 includes, for example, a solid state relay (SSR 108A), and the panel heater 108 is connected to the SSR 108A. The temperature controller 112 controls the heat generation of the panel heater 108 by controlling the energization of the panel heater 108 with the SSR 108A. The temperature / humidity sensor 114 can detect the temperature and humidity in the measurement chamber 102 by being attached to the ceiling 100C of the housing 100, for example.

  In the main controller 70, when the target temperature and the target humidity in the measurement chamber 102 are set, the heat generation control of the panel heater 108 and the humidity control air generator 104 via the temperature controller 112 so that the target temperature is obtained. Operation control is performed, and the operation control of the humidity control air generation device 104 is performed so that the target humidity can be obtained.

  In the present embodiment, the panel heater 108 is used as the heating means. However, for example, an electric heater is provided around the ventilation pipe 106 or inside the ventilation pipe 106, or heated air is supplied by the humidity control air generation device 104. A configuration in which heated air is supplied into the measurement chamber 102 may be applied. Further, the heating means is not limited to these, and a known configuration can be applied as long as the temperature of the air in the measurement chamber 102 can be increased.

  The control unit 20 is provided with a temperature / humidity monitor 132, and the temperature / humidity monitor 132 is connected to the temperature controller 112, for example. The temperature and humidity monitor 132 displays the temperature and humidity in the measurement chamber 102. Although the temperature / humidity sensor 114 and the temperature / humidity monitor 132 are connected to the temperature controller 112 here, the temperature / humidity sensor 114 and the temperature / humidity monitor 132 may be connected to the main controller 70.

  As shown in FIG. 2, the casing 100 is provided with a stirring fan 116 on the ceiling 100C. The stirring fan 116 is attached to the four corners and the center of the ceiling 100C via brackets 118, for example. When the fan motor 120 is operated, the stirring fan 116 forms an air flow along the vertical direction in the measurement chamber 102, and thereby the air in the measurement chamber 102 is stirred.

  Further, the casing 100 is provided with a stirring fan 122 on the back wall 100B. The stirring fan 122 is rotatably supported with a rotating shaft 122A protruding outward from the back wall 100B. Further, a stirring motor 124 and a transmission 126 are provided outside the housing 100, and a rotating shaft 122 </ b> A of the stirring fan 122 is connected to the stirring motor 124 via the transmission 126.

  Thus, when the stirring motor 124 is operated, the rotation of the stirring motor 124 is decelerated and transmitted to the stirring fan 122, and the stirring fan 122 is rotated. In the measurement chamber 102, the rotation of the stirring fan 122 generates an air flow along the surface of the substrate 22, that is, an air flow along a direction intersecting with the air flow of the stirring fan 116, thereby stirring the air. Is made.

  As shown in FIG. 7, the fan motor 120 and the stirring motor 124 are connected to the temperature controller 112. The temperature controller 112 operates the fan motor 120 and the agitation motor 124 to agitate the air in the measurement chamber 102 when the temperature adjustment and humidity adjustment in the measurement chamber 102 are performed.

On the other hand, in the bending characteristic measuring apparatus 10, a predetermined thermal conductivity and linear expansion coefficient (thermal coefficient) are used as the support shafts 32 </ b> A and 32 </ b> B of the fixed clamp 24 and the base 48 of the moving clamp 26 arranged in the measurement chamber 102. (Expansion coefficient) member is used. The thermal conductivity λ of the support shaft 32 and the base 48 can be, for example, 1 W / (m · K) ≦ λ ≦ 50 W / (m · K), where λ ≦ 1 W / (m · K). There may be. Further, as the linear expansion coefficient (linear expansion coefficient α) of the support shaft 32 and the base 48, 1 × 10 ⁻⁷ / (° C) ≦ α ≦ 30 × 10 ⁻⁶ / (° C) can be used. 1 × 10 ⁻⁷ ≦ α ≦ 20 × 10 ⁻⁶ / (° C.) is preferable, and 1 × 10 ⁻⁷ ≦ α ≦ 10 × 10 ⁻⁶ / (° C.) is more preferable.

  Further, as shown in FIG. 1, the upper surface of the ceiling 100C of the housing 100 is opposed to a connecting member 42 that connects the support shaft 32B of the fixed clamp 24 and the rotating shaft 40A of the torque sensor 40, A cooling fan 128 is provided. As shown in FIG. 7, the temperature controller 112 is connected to a fan motor 130 that drives the cooling fan 128. In the bending characteristic measuring apparatus 10, the fan motor 130 is driven, so that cooling air is blown from the cooling fan 128 toward the connecting member 42.

  In the bending characteristic measuring apparatus 10 configured as described above, the target humidity and the target temperature in the measurement chamber 102 are input to the main controller 70, so that the main controller 70 performs the humidity control air generation device 104 or the panel heater 108. And the temperature and humidity in the measurement chamber 102 are set as the target temperature and the target humidity.

  For example, when the target temperature and target humidity are higher than the temperature and humidity in the measurement chamber 102, the main controller 70 operates the panel heater 108 to increase the temperature in the measurement chamber 102, and the humidity control air generation device High humidity air is generated by 104 and supplied into the measurement chamber 102 for humidification.

  When the target temperature and the target humidity are lower than the temperature and humidity in the measurement chamber 102, the main controller 70 stops the panel heater 108, generates low-humidity air with the humidity-control air generation device 104, and measures. Supply into the chamber 102. In the humidity control air generation device 10, the air in the measurement chamber 102 is cooled and dehumidified by supplying the air to the measurement chamber 102 by cooling the air with a refrigerant.

  The main controller 70 operates the agitation fan 116 and the agitation fan 122 to agitate the air in the measurement chamber 102 when adjusting the temperature and humidity in the measurement chamber 102. The main controller 70 operates the cooling fan 128 when the panel heater 108 is operated to increase the temperature in the measurement chamber 102.

  Here, measurement of bending stiffness (hereinafter referred to as bending characteristics) of the measurement sample S using the bending characteristic measurement apparatus 10 applied to the present embodiment will be described.

  Sheet-like members such as paper and paperboard contain moisture according to the environmental temperature and humidity (hereinafter referred to as moisture content). When the environmental temperature and humidity change, the moisture content changes and the bending characteristics change. May occur. In particular, a paper (recording paper) used for image formation by an electrophotographic process has a bending characteristic corresponding to the water content such that the water content increases and the waist becomes weak and easily buckles. Hereinafter, the measurement sample S will be described using paper as an example.

  In general, the moisture content of the measurement sample S changes depending on the ambient temperature and humidity (hereinafter referred to as environmental temperature, environmental humidity, or environmental temperature and humidity), and the bending characteristics change according to the moisture content. From here, when measuring the bending characteristic of the measurement sample S according to the purpose of use, the moisture content with respect to the environmental temperature and humidity is measured in advance, and using this measurement result, the target temperature based on the moisture content for measuring the bending characteristic, What is necessary is just to set target humidity.

  FIG. 8 shows an example of processing performed by the bending property measuring apparatus 10 prior to measuring the bending property of the measurement sample S. When measuring the bending characteristic of the measurement sample S, the moisture content of the measurement sample S or the temperature and humidity of the measurement environment, the target temperature and the target humidity are set and input. Here, it is assumed that the target temperature and the target humidity are set from the water content when measuring the bending characteristics of the measurement sample S, and the target temperature and the target humidity are input.

  In the pretreatment shown in FIG. 8, prior to the measurement of the bending characteristics of the measurement sample S, air conditioning (temperature control and humidity control) in the measurement chamber 102 is performed. For this purpose, for example, when the target temperature and the target humidity are input by operating a keyboard or the like provided as the input device 72F in the main controller 70, the input target temperature and target humidity are read (step 200). At this time, for example, a preset user interface (hereinafter referred to as UI) is displayed on the display device 72E or the like.

  Further, in the pretreatment, the front wall 100A of the housing 100 of the measurement unit 16 is opened, and the both ends of the measurement sample S in the width direction (direction intersecting the vertical direction) are held by the fixed clamp 24 and the moving clamp 26. The measurement sample S is attached by (Step 202). At this time, the measurement sample S is temporarily held using the temporary holding portion 30A of the fixed clamp 24 and the temporary holding portion 46A of the moving clamp 26. Note that the target temperature and the target humidity may be read after the measurement sample S is temporarily held.

  Thereafter, in step 104, it is confirmed whether or not the start of air conditioning in the measurement chamber 102 has been instructed.

  Here, when the start of air conditioning is instructed, an affirmative determination is made at step 104 and the routine proceeds to step 106, where the operation of the panel heater 108 is controlled based on the target temperature. Further, the humidity-controlled air generation device 104 generates air according to the target humidity so that the air is supplied to the measurement chamber 102. Thereby, the measurement chamber 102 is air-conditioned so as to have the target temperature and the target humidity.

  Further, when the air conditioning is started, the stirring fans 116 and 122 are operated to stir the air in the measurement chamber 102. When the target temperature is higher than the temperature of the installation environment of the bending property measuring apparatus 10, the cooling fan 128 is operated to cool the connecting member 42.

  In addition, the air conditioning of the measurement chamber 102 started by the pre-processing is continued even when measuring the bending characteristics of the measurement sample S, which will be described later, and is stopped after the measurement of the bending characteristics of the measurement sample S is finished, for example.

  FIG. 9 shows an example of a measurement process of bending characteristics for the measurement sample S. This flowchart can be started in parallel with the above-described pre-processing. When the span length L and the curvature K when measuring the bending characteristics are input using the input device 72F such as a keyboard, this step 210 is executed. Read span length L and curvature K.

  The span length L and curvature K may be input from a keyboard or the like using a preset UI, or read the preset span length L and curvature K. It may be.

  When the span length L and the curvature K are read, in step 212, a target locus for moving the moving clamp 26 is set based on the span length L and the curvature K. This target trajectory may be calculated and set based on the span length L and the curvature K, and a position map (X, Y, θ) that becomes a target trajectory for the span length L and the curvature K in advance. May be stored as a map, and the position locus (X, Y, θ) may be read from this map to set the target locus.

  When the target locus is set, in step 214, it is determined whether or not the target locus is within the movable range from the target locus and the movable range of the moving clamp 26 within the opening 54 of the substrate 22. In this determination processing, an arithmetic expression indicating the coordinates (X, Y, θ) of the movable range is set in advance, and it is confirmed whether the position locus table (X, Y, θ) of the target locus is included in the movable range. To do. The determination of the target trajectory is not limited to this as long as it can be confirmed that the moving clamp 26 moved along the target trajectory does not come off the opening 54.

  In the next step 216, it is confirmed from the determination result in step 214 whether or not the movement clamp 26 can be moved along the target locus. At this time, if the target locus is out of the movable range, a negative determination is made in step 216, and the process proceeds to step 218 to perform error processing. As this error processing, for example, a configuration such as requesting resetting of the span length L and the curvature K can be applied.

On the other hand, if the target locus is within the movable range, an affirmative determination is made in step 216, and the process proceeds to step 220. In this step 220, the original position P ₀ of the moving clamp 26 (the coordinates (X ₀ , Y ₀ , θ ₀ ) of the original position P ₀ ) is set from the span length L. In the next step 222, to move the moving clamp 26 to the original position _{P 0.}

In this way, when the target locus is set and the movement clamp 26 is moved to the original position P ₀ , the measurement sample S is mounted on the fixed clamp 24 and the movement clamp 26.

  In the bending characteristic measuring apparatus 10, the measurement sample S is temporarily mounted prior to the air conditioning in the measurement chamber 102. Here, the temporarily held measurement sample S is attached to the holding member 30 (temporary) of the fixed clamp 24. The holding unit 30A and the holding unit 30B) and the holding member 46 (the temporary holding unit 46A and the holding unit 46) of the moving clamp 26 are used for holding (main mounting).

  When the measurement sample S is permanently attached, it is preferable that the moisture content of the temporarily held measurement sample S is a moisture content corresponding to the target temperature and target humidity. The moisture content of the measurement sample S held in the air-conditioned measurement chamber 102 changes as the air conditioning progresses.

  From here, it is preferable to perform the actual mounting of the measurement sample S after the temperature in the measurement chamber 102 reaches the target temperature and the humidity reaches the target humidity.

  Further, the temperature and humidity in the measurement chamber 102 are determined by the initial values of the temperature and humidity, the heating capacity of the panel heater 108, and the humidity control air generator 104. The moisture content of the measurement sample S in the measurement chamber 102 is It changes according to elapsed time.

  For example, the moisture content of the measurement sample S is W, the initial moisture content is Ws, and the target moisture content is Wt. When the inside of the measurement chamber 102 is humidified, as shown in FIG. 10A, the water content W of the measurement sample S increases with the passage of time t. Further, when the inside of the measurement chamber 102 is dehumidified, as shown in FIG. 10B, the water content W of the measurement sample S decreases with the passage of time t.

  When measuring the bending characteristics of the measurement sample S, if the difference between the water content W and the water content Wt is large, the bending characteristics may be different. From this, the water content W is preferably small when the difference is ΔW (ΔW = Wt−Ws), and this difference ΔW is within 5% of the water content Wt (−5.0 (%) ≦ ΔW / W ≦ 5.0 (%)) may be used, but it is preferably within 3% (−3.0 (%) ≦ ΔW / W ≦ 3.0 (%)).

  Here, a time Tt (time Tu and time Td) until the difference ΔW of the water content W reaches the above range is measured in advance, and after the time Tt is reached, the measurement sample S is actually attached. Anyway.

  In the flowchart of FIG. 9, when the moisture content W of the measurement sample S is determined to have reached the target moisture content Wt (temperature and humidity are the target temperature and target humidity), Install the book.

  Thereafter, in step 226, it is confirmed whether or not an instruction to start measurement of bending characteristics has been issued. That is, it is confirmed whether or not the start of measurement is instructed in a state where the air conditioning (temperature control and humidity control) in the measurement chamber 102 is completed and the measurement sample S is fully attached.

  Here, when an instruction to start measurement of the bending characteristic for the measurement sample S is given, an affirmative determination is made in step 226 and the process proceeds to step 228. In this step 228, the moving motor 66 of the shaft moving unit 60, the moving motor 68 of the shaft moving unit 62, and the rotation motor 58 are operated so that the moving clamp 26 is moved along the target locus.

  Note that the movement of the moving clamp 26 along the target locus M is moved step by step in step 228 with a predetermined amount of movement as one step. Thereby, the measurement sample S held by the fixed clamp 24 and the movable clamp 26 is bent gradually while maintaining a pure bend.

  In step 230, the output value of the torque sensor 40 corresponding to the rotational torque acting on the fixed clamp 24 when the measurement sample S is bent is read. In step 232, the coordinates (X, Y) of the position P of the moving clamp 26 are read. , Θ) and the output value of the torque sensor 40 at that time are stored as measured values.

  Thereafter, in step 234, it is confirmed whether or not the measurement of the bending characteristics has been completed. When the moving clamp 26 reaches a preset measurement end position along the target locus, an affirmative determination is made in step 234. The Thereby, the measurement of the bending characteristic with respect to the measurement sample S is complete | finished.

  As described above, in the bending characteristic measuring apparatus 10, the fixed clamp 24 and the movable clamp 26 are integrally covered with the housing 100 to form the measurement chamber 102, and the air generated by the humidity-controlled air generation device 104 in the measurement chamber 102. Can be supplied, and the air in the measurement chamber 102 can be heated by the heater panel 108, and the bending characteristic is measured with the measurement sample S in the housing 100 having a predetermined moisture content.

  At this time, in the bending property measuring apparatus 10, the casing 100 is formed using a heat insulating material having a thermal conductivity λ of 0.01 W / (m · K) ≦ λ ≦ 1.00 W / (m · K). . Thereby, in the bending characteristic measuring apparatus 10, compared with the case where a heat insulating material is not used, the measurement chamber 102 to be air-conditioned is less affected by the ambient temperature, and heat is not easily radiated from the measurement chamber 102. In the present embodiment, not only dehumidification and humidification, but also heating and cooling can be performed using the humidity-controlled air generator 104 and the panel heater 108, but bending according to the moisture content of the measurement sample S is possible. When measuring the characteristics, it is sufficient that at least heating (heating) using a heating means such as the panel heater 108 is performed.

  On the other hand, in the bending characteristic measuring apparatus 10, since the stirring fans 116 and 122 are provided in the casing 100 to stir the air in the measuring chamber 102, the temperature and humidity of the air in the measuring chamber 102 are compared to those in which stirring is not performed. Are less likely to cause unevenness, and the moisture content of the measurement sample S is less likely to be uneven.

  In the bending characteristic measuring apparatus 10, a stirring fan 116 that generates an air flow is provided in the measurement chamber 102 along the vertical direction that intersects the bending direction of the measurement sample S, and the stirring fan 116 is installed on the ceiling. It is provided at the four corners and the center of 102C. In the bending characteristic measuring apparatus 10, the rotation of the stirring motor 124 is decelerated and transmitted to the stirring fan 122.

  Thereby, the flow of air for stirring the air in the measurement chamber 102 hardly affects the bending of the measurement sample S. Further, in the measuring unit 16, the support shaft 32 of the fixed clamp 24 is supported by a stainless steel pivot bearing 34 so as to be rotatable. Thereby, in the measurement part 16, even if dew condensation occurs after the inside of the measurement chamber 102 is humidified, the pivot bearing 34 is corroded, and an increase in frictional resistance when the support shaft 32 rotates can be reduced.

  Further, in the measurement unit 16, the support shaft 32 can move in the axial direction relative to the connecting member 42 that connects the support shaft 32 and the rotation shaft 40 </ b> A of the torque sensor 40. Thereby, when the inside of the measurement chamber 102 is heated, even if the support shaft 32 moves in the axial direction due to thermal expansion, a change in load on the torque sensor 40 hardly occurs.

  In the measurement unit 16, the support shaft 32 is formed using a member having a thermal conductivity λ of 1 W / (m · K) ≦ λ ≦ 50 W / (m · K). Is not easily transmitted to the torque sensor 40 through the support shaft 32. The measurement unit 16 is provided with a cooling fan 128, and the cooling member 128 cools the connecting member 42. Furthermore, in the bending characteristic measuring apparatus 10, the ceiling 100C of the housing 100 is formed using a heat insulating material.

  Thereby, when the temperature in the measurement chamber 102 is raised, the heat in the measurement chamber 102 is not easily transmitted to the torque sensor 40 via the support shaft 32, and an error is not easily generated in the detection value of the torque sensor 40.

  Further, in the bending property measuring apparatus 10, the temporary holding units 30A and 46A are used to air-condition the measurement chamber 102 in a state where the measurement sample S is temporarily held by the fixed clamp 24 and the moving clamp 26, and the target temperature, After reaching the target humidity, the measurement sample S is permanently attached.

  Thereby, since the moisture content of the measurement sample S is changed, the bending characteristic is not measured in a state in which the measurement sample S is wrinkled or loosened.

  On the other hand, in the bending characteristic measuring apparatus 10, when a target locus for performing pure bending of the measurement sample S is set, the moving clamp 26 that moves along the target locus may come off from the opening 54 of the substrate 22. It is confirmed whether there is no.

  Thereby, for example, since the span length L of the measurement sample S is large, it is possible to reliably prevent the moving clamp 26 from hitting the peripheral edge of the opening 54.

  In addition, this Embodiment demonstrated above does not limit the structure of this invention. The present invention can be applied to a bending characteristic measuring apparatus having a known configuration for forming a bending characteristic of a sheet-like member.

It is an elevation which shows the principal part of the bending characteristic measuring apparatus which concerns on this Embodiment. It is a perspective view which shows the principal part of a measurement part. It is sectional drawing of the principal part of a measurement part. It is a perspective view which shows the principal part of a fixed clamp and a movement clamp. It is a perspective view of the principal part of a stage drive part. It is a top view of the principal part which shows the movement locus | trajectory of the movement axis when purely bending a measurement sample. It is a block diagram which shows the principal part of a control part. It is a flowchart which shows an example of the pre-processing started before measuring a bending characteristic with a bending characteristic measuring apparatus. It is a flowchart which shows an example of the measurement process of a bending characteristic. (A) And (B) is a diagram which shows the change of the moisture content with respect to the time of a measurement sample, (A) shows humidification, (B) has shown dehumidification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bending characteristic measuring device 16 Measuring part 20 Control part 22 Board | substrate 24 Fixed clamp 26 Moving clamp 30, 46 Holding member 30A, 46A Temporary holding part 30B, 64B Holding part 32 (32A, 32B) Support shaft 34 Pivot bearing 40 Torque sensor 40A Rotating shaft 42 Connecting member 52 Moving stage 54 Opening 56 Stage drive unit 58 Autorotation motor 60, 62 Axis moving unit 66, 68 Moving motor 70 Main controller 74 Stage controller 100 Housing 102 Measurement chamber 104 Humidity control air generator 108 Panel heater 112 Temperature controller 116, 118 Stirrer fan

Claims (9)

A sheet-like member is held by holding both ends in a direction intersecting the vertical direction of the sheet-like member with a pair of holding portions, and one of the pair of holding portions is opposed to the other so that the sheet-like member is curved. Bending characteristics in which relative movement is performed along a plane intersecting the vertical direction and relative rotation is performed around an axis along the vertical direction, and rotational torque received by one of the pair of holding members from the sheet-like member is measured as a bending characteristic. A measurement unit;
A housing that integrally covers the sheet-like member and the pair of holding portions that hold the sheet-like member;
Air conditioning means for heating and air-conditioning the air in the housing;
Air conditioning control means for controlling the operation of the air conditioning means;
Bending characteristic measuring device including   The air conditioning means includes humidity control means that can adjust humidity in the casing by humidifying or dehumidifying air in the casing, and the air conditioning control means controls the operation of the humidity control means. Item 2. The bending characteristic measuring device according to item 1.   The bending characteristic measuring apparatus according to claim 1, wherein the air conditioning unit includes a plate-like heating element provided on the inner surface of the casing as a heating unit. A pair of support shafts in which one of the pair of holding portions protrudes in the vertical direction;
Bearing means for rotatably supporting one of the spindles;
A torque sensor for detecting the rotational torque;
A connecting member for connecting the torque sensor and the other of the support shafts protruding from the housing;
Cooling means for cooling the connecting member;
The bending characteristic measuring device according to any one of claims 1 to 3, comprising:   The bending characteristic measuring device according to claim 4, wherein the connecting member and the support shaft are connected so as to be movable in the axial direction.   The bending characteristic measuring apparatus according to any one of claims 1 to 5, wherein the casing is formed of a heat insulating material.   The bending characteristic measuring apparatus according to any one of claims 1 to 6, wherein the casing includes a stirring unit that stirs air in the casing.   The bending characteristic measuring apparatus according to claim 7, wherein the stirring unit generates an air flow along the vertical direction in the housing. In the bending characteristic measuring device according to any one of claims 1 to 8,
A temporary holding portion that holds and holds the upper end portion of the sheet-like member in the pair of holding portions,
Holding the sheet-like member by the temporary holding unit, start air conditioning in the housing by the air conditioning means,
After the inside of the housing is in a preset air conditioning state, the sheet-like member is held by the pair of holding portions,
A bending characteristic measuring method for measuring a bending characteristic of the sheet-like member by the bending characteristic measuring unit.

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