JP2007298308A - Nip load measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nip load measuring device capable of readily and precisely measuring a nip load, without deterioration in measurement performance with the lapse of time. <P>SOLUTION: The nip load measuring device 1 is provided with two load cells 10, having bilateral symmetry in front view, and is further provided with a first turning support part 15, a second turning support part 16, and an arm 17, as a support mechanism for guiding a load receiver 11. By turning the arm 17 with the first turning support part 15 as a fulcrum, the load receiver 11 is guided to a prescribed position along an arc track. In this state, when the rigidity of a bearing included in the first turning support part 15 is high, deterioration in the measurement performance that depends on the motion of the load receiver 11 is prevented. By turning the load receiver 11 with the second turning support part 16 as a fulcrum, the difference in the heights of the load cells 10 arranged with bilateral symmetry can be absorbed, and deterioration in the measuring performance that depends on the difference in the height of the load cells 10 is prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a nip load measuring device that measures a nip load between two workpieces.

  Conventionally, in a machine having a roll pair in which one roll presses the other roll, such as a gravure printing machine or a roll coater, the nip load between the rolls greatly affects the product quality. Various techniques for measuring are disclosed.

なお、数式１において、qは線荷重、bはニップ幅の１／２、r₁,E₁,ν₁はそれぞれ加圧ロールの半径、縦弾性係数、ポアソン比、r₂,E₂,ν₂はそれぞれ固定ロールの半径、縦弾性係数、ポアソン比である。 For example, the nip width between rolls is measured with a pressure-sensitive color developing film, the linear pressure q is calculated from the Hertz formula (Formula 1) when the cylindrical elastic body comes into contact, and the calculated linear pressure q is multiplied by the roll width. Here, it has been known for a long time to calculate the nip load.

In Equation 1, q is a line load, b is ½ of the nip width, r ₁ , E ₁ , and ν ₁ are the radius, longitudinal elastic modulus, Poisson's ratio, r ₂ , E ₂ , ν, respectively. ₂ is a fixed roll radius, longitudinal elastic modulus and Poisson's ratio, respectively.

  Patent Documents 1, 2, and 3 disclose a method in which a film-shaped pressure sensor made of a piezoelectric element material is used as a detection means. However, a commercially available film-shaped pressure sensor itself has a measurement error of about 10%. There is.

  Further, if a load measuring roll in which a pressure sensor such as a load cell is embedded as disclosed in Patent Document 4 is used, the nip load between the rolls can be measured, but each time the nip load is measured. Since it is necessary to replace the roll to be pressed with a roll for measuring the load, it is not practical.

  In view of this, the present applicant discloses in Patent Document 5 a nip load measuring device that can easily and accurately measure a nip load. FIG. 6 is a front view of the nip load measuring device disclosed in Patent Document 5.

As shown in FIG. 6, the nip load measuring device 100 is a nip load measuring device that measures the nip load between rollers, and includes a load receiving portion 102 that receives the load of the pressure side roller, and a load receiving portion 102. A nip load measuring device including at least two load cells 101 for measuring a received load and two guides 103 for supporting the load receiving portion 102 and a base portion 105 that can be installed on a fixed roller. The nip load between the rolls can be easily measured by installing the 100 base portion 105 of the measuring device on the fixed-side roll.
JP 2002-340709 A Japanese Patent Application Laid-Open No. 60-15534 Japanese Patent Laid-Open No. 60-15535 JP 2001-66204 A Japanese Patent Application No. 2005-279300

  However, in the nip load measuring apparatus 100 of FIG. 6, in consideration of stability at the time of nip, an even number (two in this case) of load cells 101 are installed symmetrically as viewed from the front side of the nip load measuring apparatus 100. is doing. At this time, if the heights of the two load cells 101 installed on the left and right are different, only the load cell having a high height receives a load, which may deteriorate the stability at the time of nip. Therefore, a shim is sandwiched between the load cell having a low height and the back side of the load receiving portion 102, and the load cell is adjusted to have the same height as the load cell having a high height so that the load is uniformly applied to the two load cells 101. .

  However, the work of sandwiching the shim between the load cell 101 and the back side of the load receiving portion 102 and adjusting the height so that each load cell 101 uniformly hits the load receiver is very troublesome. Further, when the nip load is repeatedly measured, the portion of the load receiving portion 102 that comes into contact with the tip of the load cell 101 is deformed (dented), and the heights of the two load cells 101 are not the same. It had become.

  In addition, in the nip load measuring apparatus 100 shown in FIG. 6, one load receiving portion 102 is supported by two guides 103 symmetrically when viewed from the front side of the nip load measuring apparatus 100. When the load is measured, the load receiving portion 102 is bent with the load cell 101 as a fulcrum, and as a result, the guide 103 is also bent. When the guide 103 bends, the linear bush 104 and the guide 103 come into contact with each other and rub against each other, so that a groove is generated in the linear bush 104, causing play in the linear bush 104 and reducing the measurement accuracy.

  Therefore, the present invention provides a nip load measuring device that can measure a nip load easily and accurately, and does not require adjustment of the height of the load cell, and further, the load receiving guide mechanism is less likely to be loose. The purpose is to provide.

  1st invention which solves the subject mentioned above is a nip load measuring device which measures the nip load between two works, Comprising: The base part which can be installed in one said work, and the load of the other said work are received. An even number of load receiving portions, and a load measuring portion for measuring the load received by the load receiving portion, are installed between the base portion and the load receiving portion symmetrically as viewed from the front of the nip load measuring device. And a guide mechanism that guides the movement of the load receiver when one of the workpieces is loaded by the other workpiece. The guide mechanism section includes a first rotation support section provided on the base section, an arm section connected to the first rotation support section, and a first rotation support section. Connect to the arm at different points 2 of pivot support portion, at least configured, wherein the load receiving portion to the second pivot support portion is provided.

  Further, according to a second aspect, in the nip load measuring device according to the first aspect, the load receiving portion is divided into a plurality of portions, and the load measuring portion and the guide mechanism portion are the plurality of portions. It is provided for each part.

  Furthermore, a third invention is characterized in that, in the nip load measuring device according to the first invention or the second invention, the base portion has a shape in which the contact surface with the workpiece is along the workpiece. To do.

  Furthermore, a fourth invention is the nip load measuring device according to any one of the first to third inventions, wherein the base portion and / or the load receiving portion is a protective member at a portion in contact with the workpiece. It is characterized by providing.

  Further, according to a fifth invention, in the nip load measuring device according to any one of the first to fourth inventions, the base portion includes a handle portion for holding the nip load measuring device. Features.

  According to the present invention described above, the nip load can be easily measured by simply sandwiching the nip load measuring device between two workpieces, and the guide mechanism portion is provided with the first portion provided on the base portion. From a rotation support part, an arm part connected to the first rotation support part and rotating, and a second rotation support part connected to the arm part at a location different from the first rotation support part By providing the guide mechanism portion configured at least, when the load receiving portion receives a load, when the load receiving portion receives a load, the arm portion causes the first rotation support portion to move downward. The load receiving part is guided to a predetermined position while drawing a circular arc trajectory.

  Therefore, if the bearings of the first rotation support part and the second rotation support part have a high rigidity, even when the load receiving part receives a load, the bearing does not play, so that the measurement accuracy is improved. No deterioration with time will occur. Here, the work means an operating portion in the pressurizing mechanism, and specifically means a roller, a flat plate, or the like.

  Further, since the load receiving portion is installed on the second rotation support portion, the load receiving portion is in a rotatable state, and evenly symmetrically when viewed from the front side of the nip load measuring device. Even if the load measuring units are installed in two pieces (here, two) and the heights of the load measuring units are different, the load receiving unit is inclined to absorb the difference in height of the load measuring units. Therefore, it is not necessary to adjust the height of the load measuring unit.

  Furthermore, by dividing the load receiving portion into a plurality of portions and providing the load measuring portion for each of the plurality of portions, the load distribution of the nip load can be grasped simultaneously by one measurement.

  The present invention provides a nip load measuring device that can easily and accurately measure a nip load, and does not require adjustment of the height of the load cell, and further provides a nip load measuring device that is less likely to cause play in the load receiving guide mechanism. In order to achieve this, a guide mechanism having two rotation support portions and one arm is provided.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a first embodiment of the nip load measuring apparatus according to the present invention, and FIG. 2 is a side view showing the first embodiment of the nip load measuring apparatus.

  As shown in FIG. 1, a nip load measuring apparatus 1 according to the present invention includes a roller 2a (hereinafter referred to as a pressure roller) for pressing and a roller 2b fixed like a plate cylinder and an impression cylinder of a gravure printing machine. This is a device for measuring a nip load between two rollers (hereinafter, fixed rollers). The nip load measuring device 1 includes a base 12 (base portion), a load receiver 11 (load receiving portion), a load cell 10 (load measuring portion), and the like.

  The base 12 of the nip load measuring device 1 becomes a base of the nip load measuring device 1 and can be installed on the fixed roller 2b. As shown in FIG. 2, a resin protective plate 14a for protecting the fixed roll 2b is provided at the bottom of the base 12 so as not to damage the fixed roll 2b on which the nip load measuring device 1 is installed. (Protective member) is attached.

  The resin protective plate 14a has an isosceles triangle shape having a predetermined angle when viewed from the side in order to stably install the nip load measuring device 1 on the cylindrical fixed roll 2b. Further, the base 12 is provided with a handle 13 (a handle portion) for holding the nip load measuring device 1 so as to be easily carried.

  The load receiver 11 receives the load of the pressure roll 2a. In the first embodiment, the load receiver 11 is an integrated object over the entire width of the pressure roll 2a. Similarly to the base 12, a resin protective plate 14 b is attached to the load receiver 11 at a portion in contact with the pressure roll 2 a.

  The load cell 10 fixed between the base 12 and the load receiver 11 has a strain gauge inside, converts the load received by the load receiver 11 by the strain gauge into an electrical signal, and the converted electrical signal is dedicated to the load cell 10. To a converter (which converts strain gauge output to load value: not shown). An indicator (not shown) is connected to the dedicated converter, and the load value measured by the load cell 10 is displayed on the indicator.

  As shown in FIG. 1, the load cell 10 is provided with an even number (two in this case) of load cells symmetrically when viewed from the front in view of stability at the time of nip. By using an even number of load cells 10 and arranging them symmetrically, it is possible to determine whether the balance between the left and right nip loads is equal. From here, when the two load cells 10 are to be distinguished from each other, the load cell 10 arranged on the left when viewed from the front is referred to as a load cell 10 (L), and the load cell 10 arranged on the right when viewed from the side is referred to as the load cell. 10 (R).

  However, when the load cell 10 (L) and the load cell 10 (R) are installed symmetrically when viewed from the side, there is a problem if the height of the load cell 10 (L) and the load cell 10 (R) are exactly the same. However, even if the load cell 10 of the same model number is actually used, there is a slight difference in height between the load cell 10 (L) and the load cell 10 (R) as shown in FIG. A problem occurs.

  Therefore, in the nip load measuring apparatus 1 according to the present invention, in order to solve various problems caused by the difference in height between the load cell 10 (L) and the load cell 10 (R), the vertical movement is caused along with the pressure roller 2a. As a guide mechanism for guiding the load receiver 11, the nip load measuring device 1 includes a first rotation support portion 15, a second rotation support portion 16, and an arm 17.

  The arm 17 is provided with two shafts of a shaft 15a and a shaft 16a. The shaft 15a is supported by two bearings of the first rotation support portion 15, and the shaft 16a is supported by the second rotation support portion 16. Is supported by two bearings. That is, the arm 17 is in a state of being able to rotate with the center of the bearing of the first rotation support portion 15 as a fulcrum, and the load receiver 11 provided in the second rotation support portion 16 is It is in a state where it can be rotated with the center of the bearing of the rotation support part 16 as a fulcrum.

  From here, the effect | action of the 1st rotation support part 15, the 2nd rotation support part 16, and the arm 17 is demonstrated in detail. FIG. 3 is a diagram for explaining the operation of the first rotation support portion 15 and the arm 17, and FIG. 4 is a diagram for explaining the load of the pressure roller 2a being dispersed. In FIG. 3, the point A shows the position of the load receiver 11 before the load is applied, and the point B shows the position of the load receiver 11 after the load is applied.

  As shown in FIG. 3, the arm 17 rotates with the shaft 15a of the first rotation support portion 15 as a fulcrum, so that the linear motion in which the pressure roller 2a descends is converted into a rotation motion. The load receiver 11 is guided to a predetermined position by drawing the circular orbit by the rotation support portion 15.

  Further, by providing the second rotation support portion 16 on the arm 17, when a load is applied by the pressure roller 2a, the load receiver 11 is inclined with the shaft 16a of the second rotation support portion 16 as a fulcrum. Thus, the height of the load cell 10 (L) and the load cell 10 (R) is absorbed, a load is uniformly applied to the load cell load cell 10 (L) and the load cell 10 (R), and the load can be accurately measured.

  In addition, when the load receiver 11 is inclined, the load of the pressure roller 2a that is originally applied vertically becomes a load applied obliquely. However, if the load cell 10 has the same model number, the height dimensional error is several tens of μm. If the distance between the two load cells 10 is sufficiently large, this error can be ignored practically.

As shown in FIG. 4, the oblique stress (F ₀ ) is dispersed into the normal stress (F ₁ ) and the parallel stress (F ₂ ). In the present invention, the vertical stress (F ₁ ) is the stress applied to the load cell 10, the horizontal load (F ₂ ) is the stress applied to the arm 17, and the vertical load (F ₁ ) is F ₁ = F ₀ × cos θ, F ₂ = F ₀ × sin θ

For example, when the distance between the load cell 10 (L) and the load cell 10 (R) is 300 mm, and the height difference between the load cell 10 (L) and the load cell 10 (R) is 50 μm, the value of cos θ is about 0.99999999. Therefore, even if the normal stress (F ₁ ) is regarded as the value of the oblique stress (F ₀ ), there is no practical problem.

Further, since the value of sin θ is 0.000167 and the horizontal load (F ₂ ) is extremely small, the bearings of the first rotation support portion 15 and the second rotation support portion 16 have high rigidity. In this case, since there is no play in the bearing, there is no deterioration in measurement performance that occurs when the inside of the linear bush 104 and the guide 103 are used.

[Second Embodiment]
FIG. 5 is a front view showing a second embodiment of the nip load measuring apparatus according to the present invention. In addition, the part which fulfill | performs the same function as 1st Embodiment mentioned above attaches | subjects the same code | symbol or the code | symbol unified at the end, and overlapped description and drawing are abbreviate | omitted suitably.

  The nip load measuring device 2 of the second embodiment is provided with a plurality (two in this case) of load receivers 11-2, and as described above, as viewed from the front of the nip load measuring device 2, it is bilaterally symmetric. An even number (four in this case) of load cells 10 are installed, and the guide mechanism described in the first embodiment is provided for each load cell 10 installed symmetrically.

  Each load receiver 11-2 is completely divided, and an appropriate gap is provided so that the load receivers 11-2 do not contact each other. If the gap is too large, the measured value is affected. Therefore, it is desirable to make this interval as narrow as possible within a range where they do not interfere with each other.

  As described above, according to the second embodiment, each of the load receivers 11-2 can measure the nip load, so that the partial nip load in the width direction of the fixed roll 2a is accurately measured. In addition, the nip load distribution in the roll width direction can be grasped simultaneously by one measurement.

[Modification]
The present invention is not limited to the above-described embodiment, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention. For example, in each of the above-described embodiments, the example of measuring the nip load between two rolls has been described. However, the nip load between the roll and the lithographic plate or between the lithographic plate and the lithographic plate may be measured. Moreover, in 2nd Embodiment, although the example which divides | segments a load receiver into two was demonstrated, you may divide | segment into more than two.

The front view of the nip load measuring apparatus in 1st Embodiment. The side view of the nip load measuring apparatus in 1st Embodiment. The figure for demonstrating the effect | action of a 1st rotation support part and an arm. The figure for demonstrating the effect | action of a 2nd rotation support part. The front view of the nip load measuring apparatus in 2nd Embodiment. Front view of nip load measuring device of Patent Document 5

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nip load measuring apparatus 10 Load cell 11 Load receiver 12 Base 13 Handle 14a, 14b Protection board 15 1st rotation support part 16 2nd rotation support part 17 Arm 2a Pressure roll, 2b Fixed roll

Claims (5)

A nip load measuring device for measuring a nip load between two workpieces,
A base that can be installed on one of the workpieces;
A load receiving portion for receiving the load of the other workpiece;
Between the base part and the load receiving part, an even number of symmetrically installed as viewed from the front of the nip load measuring device, and a load measuring part for measuring the load received by the load receiving part,
A guide mechanism unit that is installed between the load measuring units that are installed evenly symmetrically and that guides the movement of the load receiving unit when one of the workpieces is loaded by the other workpiece. ,
The guide mechanism section is different from a first rotation support section provided on the base section, an arm section connected to the first rotation support section, and a first rotation support section. At least a second rotation support portion connected to the arm portion at a location,
The nip load measuring device, wherein the load receiving portion is installed on the second rotation support portion.   The nip load measuring device according to claim 1, wherein the load receiving portion is divided into a plurality of portions, and the load measuring portion and the guide mechanism portion are provided for each of the plurality of portions. A nip load measuring device.   3. The nip load measuring apparatus according to claim 1, wherein a contact surface of the base portion with the workpiece has a shape along the workpiece. 4.   4. The nip load measuring device according to claim 1, wherein the base portion and / or the load receiving portion includes a protective member at a portion in contact with the workpiece. 5. apparatus. The nip load measuring device according to any one of claims 1 to 4, wherein the base portion includes a handle portion for holding the nip load measuring device.

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