JP3730111B2 - Belt thickness measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt thickness measuring apparatus, and more specifically, for example, a thickness of a belt that is suitably used for an intermediate transfer, conveyance, fixing, or development for a photosensitive substrate in an electrophotographic copying machine, a laser printer, or the like. The present invention relates to an apparatus for measuring
[0002]
[Prior art]
Conventionally, conductive endless belts are frequently used in intermediate transfer devices such as electrophotographic copying machines, transfer separation devices, and charging devices. In general, conductive belts used in such applications include, for example, a conductive carbon black blended with a thermoplastic resin such as polycarbonate resin or polyethylene terephthalate resin, and extruded into a cylindrical film using a cylindrical die. Molded and formed by rounding this tubular film
In conductive resin belts used for such applications, thickness uniformity is a very important factor for clear image reproduction. For this reason, conventionally, the thickness of the manufactured conductive resin belt is measured at a predetermined number of locations using a general thickness measuring instrument, and the set state of the forming cylindrical die is adjusted while observing the result. It was.
[0004]
[Problems to be solved by the invention]
However, since the conventional thickness measuring device measures the thickness individually at a plurality of predetermined locations on the conductive resin belt, the accuracy is not so high, and there is a limit to the adjustment of the cylindrical die based on the measurement result. There was a problem that there was.
[0005]
An object of the present invention is to solve such a conventional problem. The thickness of the belt is accurately measured in the circumferential direction, and the result is reflected in the manufacture of the belt to obtain a uniform thickness. An object of the present invention is to provide a belt thickness measuring device capable of manufacturing a belt.
[0006]
[Means for Solving the Problems]
The present invention is a belt thickness measuring apparatus, which is configured as follows in order to solve the technical problems described above. That is, the belt thickness measuring apparatus of the present invention is installed at a position where the thickness of the belt is measured, and has a measurement position support surface having a length equal to or greater than the width of the belt, and a length direction of the measurement position support surface When a thickness measuring belt is hung on one driving roller, which is arranged in parallel and rotatably, and has a length equal to or greater than the width of the belt, and the measurement position support surface and the driving roller, the measurement position And at least one non-contact type measuring element installed above the slidable contact portion of the belt that comes into contact with the support surface, and a support portion that drives one end of the measurement position support surface and a drive The bearing portion for supporting one end portion of the roller for use is detachable from the end portion of the measurement position support surface and the end portion of the driving roller, respectively.
[0007]
<Specific Configuration in the Present Invention>
The belt thickness measuring apparatus according to the present invention is composed of the above-described essential constituent elements. However, the belt thickness measuring apparatus is established even when the constituent elements are specifically as follows. The specific component is characterized in that the measurement element is installed so as to be linearly movable along the length direction of the measurement position support surface.
[0008]
In the belt thickness measuring apparatus of the present invention, a plurality of measuring elements are arranged along the length direction of the measuring position support surface. Furthermore, the measuring element is a device that emits a laser and receives the reflected light, and a control device is electrically connected to the measuring element.
[0009]
In the belt thickness measuring apparatus of the present invention having such a feature, the belt thickness measuring apparatus of the present invention further includes at least one supporting roller that is arranged in parallel and rotatably with the driving roller and has a length equal to or greater than the width of the belt. The bearing that supports one end of the roller for use is also detachable from the end of the support roller.
[0010]
Furthermore, in the belt thickness measuring apparatus of the present invention, at least one of the supporting rollers is configured to be able to widen, narrow or move the distance between the shaft centers with respect to the driving roller. It is also preferable that the measurement position support surface is formed of a cylindrical body that does not rotate.
[0011]
Further, in the belt thickness measuring apparatus of the present invention, when the measuring element is viewed from the axial end of the measuring position cylindrical body, the center position of the contact width with respect to the measuring position cylindrical body and the measuring position are measured. It is preferable to install on a virtual axis passing through the axial center of the cylindrical body.
[0012]
As a more specific aspect of the belt thickness measuring apparatus of the present invention, a cylindrical body for measuring position installed at a position for measuring the thickness of the belt, and can be rotated in parallel with both sides of the cylindrical body for measuring position. When the thickness measuring belt is hung on the driving roller and the supporting roller, the measuring roller, the driving roller and the supporting roller arranged on the outer periphery of the measuring roller, At least one non-contact type measuring element installed above the sliding contact portion of the belt to be in contact with the driving roller, the supporting roller and the measuring position cylindrical body as an arrangement state of the axial end portion side , The rotation center axis of the driving roller and the support roller is located at the vertices of both ends of the virtual isosceles triangle, and the center axis of the measurement position cylindrical body is the two equilateral sides of the isosceles triangle Sandwiched between Located at the apex, the support roller and the measurement position cylindrical body are installed so as to be movable in the direction in which the parallel state is maintained, and the measurement element is installed movably in the movement direction of the measurement position cylindrical body. It is configured.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the belt thickness measuring device of the present invention will be described in more detail with respect to an embodiment shown in the drawings. 1 to 4 show a belt thickness measuring apparatus 10 according to an embodiment of the present invention. The belt thickness measuring apparatus 10 according to this embodiment basically includes four components, and each of these components is installed on the gantry 11.
[0014]
One of each of these components is a measurement position support surface 12a that is installed at a position where the thickness of the belt is measured and has a length equal to or greater than the width of the belt, and the other two components are this measurement. The driving roller 13 and the supporting roller 14 are arranged in parallel and rotatably on both sides of the position supporting surface 12a.
[0015]
The remaining one component contacts the outer peripheral surface of the measurement position support surface 12a when the measurement position support surface 12a, the driving roller 13 and the support roller 14 are hung on the belt 15 for thickness measurement. This is at least one non-contact type measuring element 16 installed above the sliding contact portion of the belt 15 to be engaged.
[0016]
Therefore, these four components will be sequentially described in detail. First, the measurement position support surface 12a for supporting the belt 15 to be measured at the measurement position is configured by a cylindrical body 12 that does not rotate as shown in FIGS. That is, in this embodiment, a part of the peripheral surface of the cylindrical body 12 is used as a surface for supporting the belt 15 at the measurement position.
[0017]
The cylindrical body 12 has shaft portions 17 attached to both ends thereof, and the shaft portions 17 are supported by supports 18 and 19 provided on the gantry 11. As is apparent from FIG. 5, the supports 18 and 19 are arranged on the upper surface of the gantry 11 so as to be movable by a linear moving mechanism unit with respect to two rails 20 arranged in parallel with a space therebetween. Each is mounted on a moving table 21.
[0018]
In the two supports 18 and 19 installed on the moving table 21, one of the supports 18 is fixed to the moving table 21 as shown in FIG. 6, and the other support 19 is connected to the moving table 21. The upper part is installed so as to be movable in the axial direction of the cylindrical body 12. As a movable structure of the support 19, a guide rail 23 is supported by two attachment portions 22 fixed on the moving table 21.
[0019]
A through hole is formed in the lower end portion of the support body 19, and a linear motion mechanism 24 for causing the support body 19 to move linearly along the guide rail 23 as a moving block is fitted into the through hole. . A ring-shaped carrier portion 25 is attached to the upper portion of the support 19 so that the attachment hole at the center is exposed to the cylindrical body 12 side and the central axis is held horizontally.
[0020]
The arrangement position including the height of the carrier 25 from the moving table 21 and the size of the center mounting hole are formed such that the tip of the shaft portion 17 of the cylindrical body 12 can enter and exit tightly into the center mounting hole. . In an actual apparatus, as shown in FIG. 4, the carrier 25 can be constituted by a normal bearing.
[0021]
Thereby, when the support body 19 moves on the moving table 21 along the guide rail 23 in a direction away from the cylindrical body 12, the shaft portion 17 relatively comes out of the center mounting hole of the support portion 25, Further, when the support 19 moves in the direction approaching the cylindrical body 12, the shaft portion 17 relatively enters the center mounting hole of the support portion 25, and the support portion 25 supports this. That is, the carrying part 25 can be attached to and detached from the shaft part 17 attached to one end of the cylindrical body 12.
[0022]
Next, the driving roller 13 and the supporting roller 14 that are arranged in parallel and rotatably on both sides of the measurement position cylindrical body 12 will be described. The driving roller 13 is rotatably supported by two supports 26 attached to the upper part of the gantry 11. The driving roller 13 is rotated from a rotating shaft of an electric motor 27 installed at the lower portion of the gantry 11 via a reduction gear device (not shown) or the like.
[0023]
Similarly to the measurement position cylindrical body 12, the driving roller 13 is configured such that the support body 26 that rotatably supports the shaft portion on one side is movable in a direction along the longitudinal axis of the driving roller 13. . The structure for moving the support 26 is substantially the same as the structure that allows one support 19 of the measurement position cylindrical body 12 shown in FIGS. 5 and 6 to move. Detailed description is omitted.
[0024]
On the other hand, the support rollers 14 arranged in parallel and rotatably along the measurement position cylindrical body 12 are installed on the top of the gantry 11 as shown in FIGS. 7 and 8. It is rotatably supported by support bodies 29 and 30 which are respectively mounted on a moving table 28 which is arranged so as to be movable with respect to the rail 20 by a linear moving mechanism.
[0025]
That is, the support roller 14 has shaft portions 31 attached to both ends thereof, and the shaft portions 31 are supported by support members 29 and 30 respectively disposed on the moving table 28. . In the two supports 29 and 30 installed on the moving table 28, one of the supports 29 is fixed to the moving table 28 as shown in FIG. It is installed so that it can move in the direction along the longitudinal axis of the support roller 14.
[0026]
The movable structure of the support 30 is exactly the same as the moving structure of the support 19 that supports one end of the measurement position cylindrical body 12 described above. Therefore, the description is omitted. Thereby, when the support body 30 moves on the moving table 28 along the guide rail 23 in the direction away from the support roller 14, the shaft portion 31 relatively comes out of the center mounting hole of the bearing portion 25.
[0027]
Further, when the support body 30 moves in the direction approaching the support roller 14, the shaft portion 31 relatively enters the center mounting hole of the bearing portion 25 and the bearing portion 25 supports this. That is, the bearing portion 25 is detachable from the shaft portion 31 attached to one end portion of the support roller 14.
[0028]
As described above, the support members 19 and 26 arranged on the same end side in the three constituent elements of the measurement position cylindrical body 12, which functions as the measurement position support surface 12 a, the driving roller 13, and the support roller 14. , 30 are configured to be spaced apart from each other so that these ends can be supported and released. The reason why it is possible to release the support on the same side end of these three components is to hang or remove the belt 15 for measuring the thickness on these components 12, 13, and 14.
[0029]
That is, in the belt thickness measuring apparatus 10 according to this embodiment, as is apparent from FIGS. 1 and 4, the arrangement of the measurement position cylindrical body 12, the driving roller 13, and the supporting roller 14 is an axial end portion. When viewed from the side, the rotation center axis of the driving roller 13 and the support roller 14 is positioned at the apexes of both ends of the virtual isosceles triangle, and the center axis of the measurement position cylindrical body 12 is an isosceles triangle It is located at the apex between two equal sides.
[0030]
In order to hang or remove the endless belt 15 on the measurement position cylindrical bodies 12, the driving roller 13, and the supporting roller 14 arranged in this manner, it is necessary to release the end portions on the same side. Because there is. The reason why the supporting roller 14 can be moved with respect to the gantry 11 by placing it on the moving table 28 is to adapt to the belts 15 having different sizes, that is, circumferential lengths.
[0031]
The reason why the measurement position cylindrical body 12 can be moved with respect to the gantry 11 is that the measurement position cylindrical body 12 is moved when the support roller 14 is moved in accordance with the size of the belt 15. This is because it is possible to accurately position the apex between the two equilateral sides in the isosceles triangle.
[0032]
By the way, as described above, the non-contact type measuring element 16 is disposed above the belt 15 hung on the measurement position cylindrical body 12. In the belt thickness measuring apparatus 10 according to this embodiment, three non-contact type measuring elements 16 are arranged at predetermined intervals in the belt 15 width direction.
[0033]
These measuring elements 16 are supported by a moving table 34, and the moving table 34 is positioned on the upper frame 33 supported by support columns 32 erected on the upper four corners of the frame 11, and the measurement position cylindrical body 12 positioned below. The driving roller 13 and the supporting roller 14 are arranged so as to be linearly movable in the arrangement direction (the length direction of the belt 15).
[0034]
That is, the moving table 34 extends in the longitudinal direction of the measurement position cylindrical body 12, and both ends thereof are supported by linear motion rails 35 installed on both sides of the upper pedestal 33 via the linear movement mechanism 36. ing. On the moving table 34, a linear motion rail 37 is further installed so as to extend in the longitudinal direction thereof, that is, in the longitudinal direction of the measurement position cylindrical body 12.
[0035]
A moving block 38 is disposed on a linear motion rail 37 installed on the moving table 34, and an elongated attachment plate 39 is mounted on the upper surface of the moving block 38 so as to be along the longitudinal direction of the moving table 34. . Three brackets 40 are further mounted on the mounting plate 39 with a predetermined interval. A groove-like recess 41 is formed on the lower surface of each bracket 40, and the upper portion of the mounting plate 39 is relatively fitted into the recess 41 so that the bracket 40 can be slid linearly on the mounting plate 39. It has been.
[0036]
As shown in FIGS. 9 and 10, each bracket 40 is fixed to the mounting plate 39 by passing two elongated holes 42 provided in the bracket 40 into two screw holes formed on the upper surface of the mounting plate 39. This is done by screwing the bolts 43. Since the two long holes 42 are formed in the sliding direction with respect to the mounting plate 39 of the bracket 40, the mounting position can be finely adjusted within the range of the length of the long hole 42.
[0037]
A flange portion 40a extending in a direction substantially perpendicular to the upper surface of the mounting plate 39 is integrally formed on the side portion of each bracket 40, and a measuring element support body that is long in the vertical direction is formed on the side surface of the flange portion 40a. 44 is fixed by a bolt 45. Here, the “longitudinal direction” means an axial direction passing through the central portion of the measurement position cylindrical body 12, more precisely, a direction orthogonal to the upper surface of the moving table 34.
[0038]
When the measuring element support 44 is fixed to the side surface of the flange portion 40a with the bolt 45, the bolt insertion hole formed in the measuring element support 44 is a long hole in the vertical direction. It is possible to finely adjust the mounting position of the 44 on the flange portion 40a in the vertical direction.
[0039]
As described above, the above-described non-contact type measuring element 16 is attached to the lower end portion of each measuring element support 44 supported by the moving block 38 as a result. Specifically, each measuring element 16 is a device configured to emit laser light and receive reflected light thereof, and each measuring element 16 is a control device 46 (see FIG. 1 to FIG. 3).
[0040]
Incidentally, a screw block 48 is fixed to a moving block 38 that is mounted on a linear motion rail 37 installed on the moving table 34 and moves using a bracket 47 as shown in FIG. The screw block 48 is formed with a through-hole in which an inner periphery is threaded, and the central axis of the screw through-hole is completely parallel to the linear motion rail 37.
[0041]
The screw through holes are screwed with feed screw rods 50 whose ends are rotatably supported by bearing portions 49 installed on both sides of the moving table 37. One end portion of the feed screw rod 50 protrudes through the bearing portion 49, and a handle portion 51 for manually rotating the feed screw rod 50 is connected to the tip end portion thereof.
[0042]
Accordingly, when the handle portion 51 is rotated, the feed screw rod 50 is rotated, and as a result, the screw block 48 is moved. The movement of the screw block 48 moves the moving block 38 connected thereto via the bracket 47 on the linear motion rail 37. Since the moving block 38 can be manually moved in this way, the three measuring elements 16 can be moved together in the width direction of the belt 15, and thus the desired position in the width direction of the belt 15 for measuring the thickness. Can be placed exactly on top.
[0043]
Next, the operation of the belt thickness measuring apparatus 10 according to this embodiment will be described. First, the belt 15 for measuring the thickness is hung so as to go around the measurement position cylindrical body 12, the driving roller 13, and the supporting roller 14. At this time, as the method of hanging the belt 15, as described above, the support bodies 19 and 26 that support the same side end portions of the measurement position cylindrical body 12, the driving roller 13, and the supporting roller 14, 30 is moved to release each end.
[0044]
When the belt 15 for measuring the thickness is hung on the measuring position cylindrical body 12, the driving roller 13, and the supporting roller 14, each of the supporting bodies 19, 26, 30 is restored to support these ends again. Return to position. When the belt 15 is hung on the measurement position cylindrical body 12, the driving roller 13, and the supporting roller 14, depending on the size of the belt 15, the moving table 28 supporting the supporting roller 14 is moved in the lateral direction.
[0045]
At the same time, the measurement position cylindrical body 12 is also moved so that the axis line is located at each of the aforementioned vertices of the isosceles triangle when the arrangement of these three components is viewed from the end side. Specifically, as described above, the measurement position cylindrical body 12 is moved and adjusted so that its axis is positioned at the apex between two isosceles triangles. As a result, the intermediate portion of the slidable contact surface of the belt 15 that contacts the measurement position cylindrical body 12 is positioned on the vertical axis that crosses the longitudinal central axis of the cylindrical body 12.
[0046]
On the other hand, the three measuring elements 16 are also adjusted so that each laser light emitting unit is positioned on a vertical axis crossing the longitudinal central axis of the cylindrical body 12 by moving the moving table 34. At the same time, each bracket 40 is individually fine-adjusted with respect to the mounting plate 39 so that the measuring elements 16 attached to the respective measuring element supports 44 are directed to predetermined positions in the width direction of the belt 15, or handle portions By rotating the feed screw rod 50 using 51, the three measuring elements 16 are moved together, and these measuring elements 16 are arranged at the optimum positions.
[0047]
Thereafter, when a start button (not shown) provided on the control device 46 attached to the gantry 11 is pressed, an operation instruction is output to each part along a predetermined program. Basically, each measuring element 16 is instructed to emit a laser beam and operate the electric motor 27. When the electric motor 27 rotates, this rotation is transmitted to the driving roller 13 and the belt 15 is rotated at a predetermined constant speed.
[0048]
Each measuring element 16 continues to emit laser light while the belt 15 goes around, receives the reflected light, measures the distance from the laser light emitting portion of each measuring element 16 to the surface of the belt 15, and uses this as a signal. The data is converted and input to the control device 46 as data. The control device 46 stores in advance the distance from the laser light emitting portion of each measuring element 16 to the surface of the measurement position cylindrical body 12, and the data is compared with the measured distance to the surface of the belt 15. The change in the thickness of the belt 15 is calculated, and this is displayed as a waveform of the change in thickness, for example, on a display or printed out.
[0049]
As described above, in the belt thickness measuring apparatus 10 according to the present embodiment, the thickness of the belt 15 at a plurality of arbitrary positions in the width direction can be continuously and easily measured. A belt with a uniform thickness can be manufactured by adjusting the state.
[0050]
In the belt thickness measuring apparatus according to the above-described embodiment, the measurement position support surface is formed by using a non-rotating cylindrical body. This is one of the important points of the present invention. That is, if the cylindrical body serving as a support surface for measuring the thickness of the belt is rotated, the eccentricity error of the cylindrical body affects the thickness of the belt to be measured, so that an accurate measurement value can be obtained. Can not. Therefore, the belt is brought into sliding contact with the surface of the cylindrical body. In this sense, the measurement position support surface is not limited to a cylindrical body, and may be an elongated plate having an arcuate end surface.
[0051]
Further, in the belt thickness measuring apparatus according to the above-described embodiment, the cylindrical body, the driving roller, and the supporting roller, which are the measurement position support surfaces, are respectively centered at the vertices of the isosceles triangle as viewed from the end surface side. Although the arrangement is such that the axes are located, such an arrangement has the advantage that the arrangement of the measuring elements for accurate belt thickness measurement is very easy.
[0052]
That is, when the measurement position cylindrical body, the driving roller, and the supporting roller are arranged as described above, the measurement element is simply positioned on a virtual vertical axis passing through the central axis of the measurement position cylindrical body. That's good. However, in the present invention, there is no reason why the cylindrical bodies for measurement positions, the driving rollers, and the supporting rollers have to be arranged as described above, and it goes without saying that any arrangement may be used.
[0053]
Furthermore, the supporting roller is not indispensable, and at least the measuring position supporting surface and the driving roller are required, but in this case, the driving roller is separated from the measuring position supporting surface. It needs to be possible and adaptable to any size belt.
[0054]
【The invention's effect】
As described above, according to the belt thickness measuring apparatus of the present invention, the thickness of the belt is accurately measured in the circumferential direction, and the result is reflected in the manufacture of the belt to manufacture a belt having a uniform thickness. be able to.
[Brief description of the drawings]
FIG. 1 is a front view showing a belt thickness measuring apparatus according to an embodiment of the present invention.
FIG. 2 is a top view showing the belt thickness measuring apparatus shown in FIG.
FIG. 3 is a side view of the belt thickness measuring apparatus shown in FIG. 1 as viewed from the right side.
4 is a cross-sectional view showing the belt thickness measuring device shown in FIG. 1 cut along line 4-4. FIG.
FIG. 5 is a partial cross-sectional view showing in detail a cylindrical body for measurement position and a support structure thereof constituting the belt thickness measuring apparatus.
6 is a top view of the measurement position cylindrical body and its support structure shown in FIG. 5 as viewed from above. FIG.
FIG. 7 is a fragmentary sectional view partially showing a supporting roller and a supporting structure constituting the belt thickness measuring apparatus.
8 is a top view of the supporting roller and its supporting structure shown in FIG. 7 as viewed from above.
FIG. 9 is a cross-sectional view partially showing a measuring element and a support structure thereof constituting the belt thickness measuring apparatus.
10 is a partial top view of the measuring element and its support structure shown in FIG. 9 as viewed from above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Belt thickness measuring apparatus 11 Base 12 Measuring position support surface 12a Measuring position cylindrical body 13 Driving roller 14 Supporting roller 15 Measuring belt 16 Measuring element 17 Shaft part 18, 19 Support body 20 Rail 21 Moving table 22 Mounting portion 23 Guide rail 24 Linear motion mechanism 25 Supporting portion 26 Support body 27 Electric motor 28 Moving table 29, 30 Support body 31 Shaft portion 32 Support pillar 33 Upper mount 34 Moving table 35 Direct motion rail 36 Linear movement mechanism portion 37 Direct Moving rail 38 Moving block 39 Mounting plate 40 Bracket 41 Groove-shaped recess 42 Slot 43, 45 Bolt 44 Measuring element support 46 Controller 47 Bracket 48 Screw block 49 Bearing section 50 Feed screw rod 51 Handle section

Claims (9)

The measurement position support surface is installed at a position for measuring the thickness of the belt, and has a length equal to or greater than the width of the belt, and is arranged in parallel with the length direction of the measurement position support surface and rotatably. When a thickness measuring belt is hung on one driving roller having a length equal to or larger than the width of the belt, the measuring position supporting surface, and the driving roller, the contacting roller contacts the measuring position supporting surface. Comprising at least one non-contact type measuring element installed above the sliding contact portion of the belt,
A support portion that supports one end portion of the measurement position support surface and a bearing portion that supports one end portion of the drive roller are respectively connected to the end portion of the measurement position support surface and the drive roller. A belt thickness measuring device which is detachable from the end portion. The belt thickness measuring device according to claim 1, wherein the measuring element is installed so as to be linearly movable along a length direction of the measuring position support surface. The belt thickness measuring device according to claim 1, wherein a plurality of the measuring elements are arranged along a length direction of the measuring position support surface. The said measuring element is an apparatus which emits a laser and receives the reflected light, and the control apparatus is electrically connected to this measuring element, The Claim 1 characterized by the above-mentioned. Belt thickness measuring device. The belt thickness measuring device according to any one of claims 1 to 4, further comprising at least one supporting roller that is arranged in parallel and rotatably with the driving roller and has a length equal to or greater than the width of the belt. The belt thickness measuring apparatus is characterized in that a bearing portion for supporting one end portion of the supporting roller is also detachable from the end portion of the supporting roller. 6. The belt thickness measuring apparatus according to claim 5, wherein at least one of the supporting rollers is configured to be able to widen, narrow, or move an axial center distance with respect to the driving roller. The belt thickness measuring device according to any one of claims 1 to 6, wherein the measurement position support surface is formed of a cylindrical body that does not rotate. When the measuring element is viewed from the axial end of the measuring position cylindrical body, the center position of the contact width of the belt with respect to the measuring position cylindrical body and the axial center of the measuring position cylindrical body The belt thickness measuring apparatus according to claim 7, wherein the belt thickness measuring apparatus is installed on a virtual axis passing through the section. A measuring position cylindrical body installed at a position for measuring the thickness of the belt, a driving roller and a supporting roller arranged in parallel and rotatably on both sides of the measuring position cylindrical body, and the measurement Installed above the sliding portion of the belt that comes into contact with the outer peripheral surface of the cylindrical body for measurement position when the thickness measuring belt is hung on the cylindrical body for position, the driving roller and the supporting roller. And at least one non-contact type measuring element formed,
As the arrangement state of the driving roller, the supporting roller, and the measurement position cylindrical body, when viewed from the axial end, the rotation center axis of the driving roller and the supporting roller has two virtual axes. Located at the apexes of both ends of the base in the equilateral triangle, and the central axis of the measurement position cylindrical body is located at the apex between the two equilateral sides of the isosceles triangle, the support roller and the measurement position cylindrical A belt thickness measuring device, wherein the belt thickness measuring device is installed so as to be movable in a direction in which the body is maintained in a parallel state, and further, the measuring element is movably installed in the moving direction of the cylindrical body for measurement position.

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