JP5958263B2 - Lubricant applicator, fixing device, and image forming apparatus - Google Patents

Description

  The present invention relates to a lubricant applicator, a fixing device, and an image forming apparatus.

  For example, Patent Document 1 discloses a fixing device in which a rotating member is pressed against a pressure member via a fixing belt. In this fixing device, the lubricant is supplied to the inner peripheral surface of the fixing belt by a lubricant application member made of felt.

  Patent Document 2 discloses a lubricant holding portion that applies a lubricant to the inner peripheral surface of an endless belt that moves while contacting a fixing roll. The lubricant holding portion is disposed so that only the blade tip portion contacts the inner peripheral surface of the endless belt.

JP 2005-331578 A JP-A-2005-241765

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lubricant applicator having an increased amount of lubricant retained, and a fixing device and an image forming apparatus provided with the lubricant applicator.

The lubricant applicator according to claim 1 is:
A lubricant applicator for applying a liquid lubricant to a moving strip,
A pair of plate-like bodies arranged opposite to each other;
The lubricant is disposed between the pair of plate-like bodies and extends along the plate-like body, and has an end portion that contacts the belt-like body and protrudes from between the pair of plate-like bodies. Fiber body,
The fiber body is coupled to both of the pair of plate-like bodies so that the fiber body is separated from the other plate-like body when the fiber body is in a position in contact with one of the pair of plate-like bodies. And an interval maintaining body for maintaining an interval between the pair of plate-like bodies at an interval larger than the thickness of the fibrous body.

The fixing device according to claim 2 is:
An endless strip that circulates,
An addressing member having an addressing surface addressed to the inner surface of the strip;
By pressing and rotating the outer surface of the belt-like body toward the addressed surface, a medium holding an unfixed toner image is received between the belt-like body and the toner image together with the belt-like body. A roll to be fixed on the medium;
A lubricant applicator for applying a liquid lubricant to the inner surface of the strip,
The lubricant applicator is
A pair of plate-like bodies arranged opposite to each other;
The lubricant is disposed between the pair of plate-like bodies and extends along the plate-like body, and has an end portion that contacts the belt-like body and protrudes from between the pair of plate-like bodies. Fiber body,
The fiber body is coupled to both of the pair of plate-like bodies so that the fiber body is separated from the other plate-like body when the fiber body is in a position in contact with one of the pair of plate-like bodies. And an interval maintaining body for maintaining an interval between the pair of plate-like bodies at an interval larger than the thickness of the fibrous body.

An image forming apparatus according to claim 3
An image forming unit for forming an unfixed toner image on a medium;
An endless strip that circulates,
An addressing member having an addressing surface addressed to the inner surface of the strip;
By pressing and rotating the outer surface of the belt-like body toward the addressed surface, a medium holding an unfixed toner image is received between the belt-like body and the toner image together with the belt-like body. A roll to be fixed on the medium;
A lubricant applicator for applying a liquid lubricant to the inner surface of the strip,
The lubricant applicator is
A pair of plate-like bodies arranged opposite to each other;
The lubricant is disposed between the pair of plate-like bodies and extends along the plate-like body, and has an end portion that contacts the belt-like body and protrudes from between the pair of plate-like bodies. Fiber body,
The fiber body is coupled to both of the pair of plate-like bodies so that the fiber body is separated from the other plate-like body when the fiber body is in a position in contact with one of the pair of plate-like bodies. And an interval maintaining body for maintaining an interval between the pair of plate-like bodies at an interval larger than the thickness of the fibrous body.

  The lubricant applicator according to claim 1 increases the amount of lubricant retained as compared to the case where the lubricant applicator does not have this configuration.

  The fixing device according to the second aspect and the image forming apparatus according to the third aspect have a longer period for maintaining the lubrication of the belt-like body than in the case where this configuration is not provided.

1 is a configuration diagram illustrating an embodiment of an image forming apparatus of the present invention. FIG. 2 is a configuration diagram illustrating a schematic configuration of a fixing device illustrated in FIG. 1. FIG. 3 is a plan view of the lubricant applicator shown in FIG. 2. It is sectional drawing of the lubricant applicator shown in FIG. It is a top view which shows the lubricant applicator which concerns on 2nd Embodiment. It is sectional drawing of the lubricant applicator shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram showing an embodiment of an image forming apparatus of the present invention.

  The image forming apparatus 1 shown in FIG. 1 has image forming units 10Y, 10M, 10C, and 10K arranged in parallel for each color of yellow (Y), magenta (M), cyan (C), and black (K). This is a tandem color printer. The image forming apparatus 1 can print a single-color image and can print a full-color image including four color toner images. The toner cartridges 18Y, 18M, 18C, and 18K contain YMCK color toners.

  Since the four image forming units 10Y, 10M, 10C, and 10K have substantially the same configuration, the image forming unit 10Y corresponding to yellow will be described as a representative example. The image forming unit 10Y includes a photoreceptor drum 11Y, a charger 12Y, an exposure device 13Y, a developing device 14Y, a primary transfer device 15Y, and a photoreceptor cleaner 16Y.

  The photoconductive drum 11Y is provided with a photoconductive layer on the surface of a cylindrical substrate, and holds an image formed on the surface and rotates in the direction of arrow A around the axis of the cylinder. The charger 12Y, the exposure device 13Y, the developing device 14Y, the primary transfer device 15Y, and the photoreceptor cleaner 16Y are arranged around the photoreceptor drum 11Y in the order of the arrow A.

  The charger 12Y is a device that charges the surface of the photosensitive drum 11Y. The charger 12Y is a charging roll that comes into contact with the surface of the photosensitive drum 11Y. A voltage having the same polarity as that of the toner in the developing device 14Y is applied to the charger 12Y, and the surface of the photosensitive drum 11Y in contact with the charger 12Y is charged. The exposure device 13Y is a device that exposes the surface of the photosensitive drum 11Y by exposing it to exposure light. The exposure device 13Y emits a laser beam corresponding to an image signal applied from the outside of the image forming apparatus 1, and scans the photosensitive drum 11Y with the laser beam. The developing device 14Y develops the surface of the photosensitive drum 11Y using a developer. Toner is applied from the toner cartridge 18Y to the developing device 14Y. The developing device 14Y charges the toner and the magnetic carrier by stirring the developer in which the magnetic carrier and the toner are mixed, and develops the surface of the photoreceptor drum 11Y with the charged toner. The primary transfer unit 15Y is a roll that faces the photosensitive drum 11Y with the intermediate transfer belt 30 interposed therebetween. The primary transfer unit 15Y transfers a toner image on the photosensitive drum 11Y to the intermediate transfer belt 30 by applying a voltage to the photosensitive drum 11Y. The photoreceptor cleaner 16Y cleans the surface of the photoreceptor drum 11Y by removing unnecessary materials such as toner remaining on the portion of the surface of the photoreceptor drum 11Y that has been transferred by the primary transfer unit 15Y.

  The image forming apparatus 1 also includes an intermediate transfer belt 30, a fixing device 60, a paper transport unit 80, and a control unit 1A. The intermediate transfer belt 30 is an endless belt that is stretched between belt support rolls 31 to 35. The intermediate transfer belt 30 circulates in the direction of arrow B passing through the image forming units 10Y, 10M, 10C, and 10K and the secondary transfer unit 50. The toner images of the respective colors are transferred to the intermediate transfer belt 30 from the image forming units 10Y, 10M, 10C, and 10K. The intermediate transfer belt 30 moves while holding the toner images of these colors.

  The secondary transfer device 50 is a roll that rotates with the intermediate transfer belt 30 and the paper P interposed between the backup roll 34 that is one of the belt support rolls 31 to 35. The secondary transfer device 50 transfers the toner image on the intermediate transfer belt 30 onto the paper P by applying a voltage having a polarity opposite to the charging polarity of the toner.

  The fixing device 60 is a device that fixes the toner image on the paper P. The fixing device 60 includes a fixing belt 61 and a pressure roll 62, and a heating roll 63 is disposed in the heating roll 61. The fixing belt 61 and the pressure roller 62 sandwich and pass the paper P on which the toner image before fixing is formed to heat and press the toner, thereby fixing the toner image on the paper P.

  The paper transport unit 80 transports the paper P along a paper transport path R that passes through the secondary transfer device 50 and the fixing device 60. The paper transport unit 80 includes a take-out roll 81, a transport roll 82, a registration roll 84, and a discharge roll 86. The take-out roll 81 takes out the paper P stored in the paper container T, and the transport roll 82 transports the taken-out paper P. The registration roll 84 conveys the paper P to the secondary transfer device 50, and the discharge roll 86 discharges the paper P to the outside.

  The basic operation of the image forming apparatus 1 shown in FIG. 1 will be described. In the yellow image forming unit 10Y, the photosensitive drum 11Y is rotationally driven in the direction of arrow A, and the surface of the photosensitive drum 11Y is charged by the charger 12Y. The exposure device 13Y irradiates the photosensitive drum 11Y with exposure light corresponding to data corresponding to each color in the image signal. The exposure device 13Y irradiates the surface of the photosensitive drum 11Y with exposure light based on an image signal corresponding to yellow of the image signals applied from the outside, thereby forming an electrostatic latent image on the surface of the photosensitive drum 11Y. Form. Yellow toner is applied from the toner cartridge 18Y to the developing device 14Y. The developing device 14Y forms a toner image by developing the electrostatic latent image on the photosensitive drum 11Y with toner. The photosensitive drum 11Y rotates while holding a yellow toner image formed on the surface. The toner image formed on the surface of the photoreceptor drum 11Y is transferred to the intermediate transfer belt 30 by the primary transfer unit 15Y. After the transfer, the toner remaining on the photoconductive drum 11Y is removed by the photoconductive cleaner 16Y.

  The intermediate transfer belt 30 is cyclically moved in the arrow B direction. Similar to the image forming unit 10Y, the image forming units 10M, 10C, and 10K corresponding to colors other than yellow form toner images corresponding to the respective colors, and transfer the toner images while being superimposed on the intermediate transfer belt 30. .

  The paper P is taken out from the paper container T by the take-out roll 81. The paper P is transported by the transport roll 82 and the registration roll 84 in the direction of arrow C along the paper transport path R toward the secondary transfer unit 50. The registration roll 84 sends the paper P to the secondary transfer device 50 based on the timing at which the toner image is transferred onto the intermediate transfer belt 30. The secondary transfer unit 50 transfers the toner image on the intermediate transfer belt 30 onto the paper P. The paper P onto which the toner image has been transferred is conveyed from the secondary transfer device 50 to the fixing device 60, and the toner image transferred onto the paper P is fixed. In this way, an image is formed on the paper P. The paper P on which the image is formed is discharged to the outside of the image forming apparatus 1 by a discharge roll 86. The toner remaining on the intermediate transfer belt 30 after the transfer by the secondary transfer device 50 is removed by the belt cleaner 70.

[Fixing device]
FIG. 2 is a configuration diagram illustrating a schematic configuration of the fixing device illustrated in FIG. 1.

  The fixing device 60 includes a fixing belt 61, a pressure roll 62, a heating roll 63, a steering roll 64, a fixed pad 65, and a lubricant applicator 66.

  The fixing belt 61 is an endless belt and is supported from the inner surface by a heating roll 63, a steering roll 64, and a fixed pad 65. More specifically, the fixing belt 61 is stretched over the heating roll 63, the steering roll 64, and the fixed pad 65, and circulates and moves in the direction indicated by the arrow D as the heating roll 63 and the steering roll 64 rotate. . The fixing belt 61 has a structure in which a rubber layer and a release layer are provided on a base material. For example, the base material is made of polyimide, and the rubber layer is made of silicone rubber. The release layer is a fluorine-based resin such as PFA (perfluoroalkoxyalkane). The fixing belt 61 corresponds to an example of a belt-like body referred to in the present invention.

  The heating roll 63 and the steering roll 64 are cylindrical members formed of a metal material. A heater 631 is built in the heating roll 63. The heating roll 63 and the steering roll 64 heat the fixing belt 61 from the inner surface. The heating roll 63 is driven to rotate by a motor (not shown). The steering roll 64 has a rotary shaft 641 that is tiltably held. By tilting the rotary shaft 641, the position of the fixing belt 61 in the axial direction is adjusted.

  The fixed pad 65 is assigned to the inner surface of the fixing belt 61. The fixed pad 65 is made of, for example, a metal material, and has a shape that extends long in the direction along the heating roll 63 and the steering roll 64. Of the side surfaces of the fixed pad 65, the surface facing the pressure roll 62 is an address surface 65 a addressed to the inner surface of the fixing belt 61. The fixing belt 61 slides on the addressing surface 65 a of the fixed pad 65. A heater 651 is also provided inside the fixed pad 65.

  The pressure roll 62 is disposed on the opposite side of the fixing pad 65 with the fixing belt 61 interposed therebetween. The pressure roll 62 has a structure in which the peripheral surface of a cylindrical member made of a metal material is covered with an elastic layer made of a rubber material. The pressure roll 62 presses the outer surface of the fixing belt 61 toward the surface 65a. The pressure roll 62 is driven by a motor (not shown) and rotates in the direction indicated by the arrow E. The pressure roll 62 rotates to receive the paper P holding the unfixed toner image (see FIG. 1) between the fixing belt 61 and fix the toner image on the paper P in cooperation with the fixing belt 61. Let

  The lubricant applicator 66 is disposed inside the fixing belt 61 and applies a lubricant to the inner surface of the fixing belt 61. The lubricant is for enhancing the lubricity (reducing the friction coefficient) between the inner surface of the fixing belt 61 and the facing surface 65a of the fixed pad 65, and reducing the frictional force. The lubricant applicator 66 of the present embodiment is located on the inner surface of the fixing belt 61 between the heating roll 63 and the fixed pad 65, that is, upstream of the fixed pad 65 in the moving direction D of the fixing belt 61. Has been placed.

[Lubricant applicator]
FIG. 3 is a plan view of the lubricant applicator shown in FIG. FIG. 3 shows the lubricant applicator as viewed in the moving direction D of the fixing belt 61 (see FIG. 2). FIG. 4 is a cross-sectional view of the lubricant applicator shown in FIG. FIG. 4 shows the lubricant applicator in contact with the fixing belt.

  The lubricant applicator 66 shown in FIGS. 3 and 4 includes a case 662, a fibrous body 661, and a spacer 663.

  The case 662 is formed, for example, by bending a metal plate and has a U-shaped cross section. The case 662 has a pair of flat plate portions 662a and 662b arranged to face each other. Here, the flat plate portions 662a and 662b correspond to an example of a plate-like body according to the present invention. Further, the spacer 663 corresponds to an example of the interval maintaining body referred to in the present invention.

  The fibrous body 661 is a plate-like member formed by folding a resin sheet formed in a fibrous shape. The fibrous body 661 is disposed between the pair of flat plate portions 662a and 662b of the case 662, and spreads along the flat plate portions 662a and 662b. The fibrous body 661 contains a lubricant. The lubricant is liquid, for example, amino-modified silicone oil. The fibrous body 661 is obtained by forming a fluororesin, for example, polytetrafluoroethylene (PTFE) into a fibrous shape. An end portion 661e of the fiber body 661 formed by folding the resin sheet at the bent portion protrudes between the pair of flat plate portions 662a and 662b. This end 661 e contacts the fixing belt 61.

  The spacer 663 is coupled to both the flat plate portions 662a and 662b of the case 662. A plurality of spacers 663 are disposed between the pair of flat plate portions 662a and 662b. Each of the spacers 663 is a metal columnar member, and is disposed so as to be sandwiched between the pair of flat plate portions 662a and 662b. Each of the spacers 663 is provided through the fiber body 661, and both ends thereof are fixed to the flat plate portions 662a and 662b, respectively. More specifically, both ends of the spacer 663 are bonded to the flat plate portions 662a and 662b. The height S of the spacer 663 is higher than the thickness T of the fibrous body 661. Accordingly, the spacer 663 maintains the interval S between the pair of flat plate portions 662a and 662b at an interval larger than the thickness T of the fibrous body 661. Therefore, a gap is generated between at least one of the pair of flat plate portions 662a and 662b and the fiber body 661. This gap is a gap that allows the lubricant to be retained by capillary action.

  In the lubricant applicator 66 of the present embodiment, the lubricant is held not only inside the fiber body 661 but also in a gap between at least one of the pair of flat plate portions 662a and 662b and the fiber body 661 by capillary action. . Therefore, compared with the case where both the flat plate portions 662a and 662b are in surface contact with the fibrous body 661, the amount of lubricant retained is large. When the amount of the lubricant held in the lubricant applicator 66 is large, the time for the lubricant applicator 66 to supply the lubricant to the fixing belt 61 is extended. Therefore, in the fixing device 60, the maintenance period of lubrication of the fixing belt 61 is prolonged.

  If lubrication of the fixing belt 61 is impaired, the frictional force between the fixing belt 61 and the surface 65a to which the fixed pad 65 is directed increases. In this case, the moving speed of the fixing belt 61 is slower than the moving speed of the peripheral surface of the pressure roll 62, and there is a possibility that paper wrinkles will occur on the paper P sandwiched between the fixing belt 61 and the pressure roll 62. . In the fixing device 60 of the present embodiment, since the maintenance period of lubrication of the fixing belt 61 is prolonged, the period during which paper wrinkles due to speed differences are suppressed is prolonged.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the following description of the second embodiment, the same reference numerals are given to the same elements as those in the embodiments described so far, and differences from the above-described embodiments will be described.

  FIG. 5 is a plan view showing a lubricant applicator according to the second embodiment. FIG. 6 is a cross-sectional view of the lubricant applicator shown in FIG.

  The lubricant applicator 166 shown in FIGS. 5 and 6 includes a pair of flat plates 1664 and 1665 instead of the case having a U-shaped cross section. The flat plates 1664 and 1665 are separate members, and are disposed to face each other. Of both ends of the flat plates 1664 and 1665, the end corresponding to the opposite side of the end portion 661e in the fibrous body 661 is open. The flat plates 1664 and 1665 correspond to an example of a plate-like body referred to in the present invention. The flat plates 1664 and 1665 are provided with a plurality of connecting portions 1665s. Each of the plurality of connecting portions 1665s is disposed between the plurality of spacers 663. The connecting portion 1665s is formed by a caulking process. That is, the connecting portion 1665s is formed by passing a cylindrical flange formed around one hole from one flat plate 1665 by burring through a hole formed in the other flat plate 1664 out of the pair of flat plates 1664, 1665. It is formed by widening the circular end of the flange. In the caulking process, force is applied to the flat plates 1664 and 1665 in a direction approaching each other, but the thickness between the plates 1664 and 1665 is maintained by the spacer 1663. By the caulking process, the pair of flat plates 1664 and 1665 are firmly joined so as not to be separated from each other. Moreover, it is not necessary to use a screw or an adhesive for fixing.

  In the lubricant applicator 166 of this embodiment, a spacer 1663 is interposed between a pair of flat plates 1664 and 1665. The spacer 1663 maintains the interval between the pair of flat plates 1664 and 1665 at an interval larger than the thickness of the fibrous body 661. In the lubricant applicator 166 of this embodiment, the pair of flat plates 1664 and 1665 are fixed by the connecting portion 1665s so as not to be separated from each other. Therefore, the spacer 1663 may be held between the pair of flat plates 1664 and 1665, and may be fixed to either of the flat plates 1664 and 1665 with a weaker force than the connecting portion 1665s.

  In the lubricant applicator 166 of this embodiment, the lubricant is held not only inside the fiber body 661 but also in a gap between at least one of the pair of flat plates 1664 and 1665 and the fiber body 661. Therefore, compared with the case where both the flat plates 1664 and 1665 are in surface contact with the fibrous body 661, the amount of lubricant retained is large.

  In the lubricant applicator 166 of this embodiment, the ends of the flat plates 1664 and 1665 corresponding to the opposite side of the end 661e are open. When supplying the lubricant to the lubricant applicator 166, the lubricant is supplied to the fiber body 661 from the open end side of the flat plates 1664 and 1665 on the opposite side of the end portion 661e. In the case of supplying from the end portion 661e, it is conceivable that the lubricant is excessively held in the end portion 661e when the lubricant in the lubricant applicator 166 is completely filled. On the other hand, the lubricant applicator 166 of this embodiment is supplied with the lubricant from the side opposite to the end 661e, so that the possibility that the lubricant is excessively held at the end 661e is reduced. Therefore, there is no possibility that the lubricant is excessively supplied from the lubricant applicator 166 to the fixing belt 61.

  In the above-described embodiment, the lubricant applicator 66 disposed upstream of the fixed pad 65 is shown as an example of the lubricant applicator according to the present invention. However, the present invention is not limited to this. For example, the lubricant applicator may be disposed downstream of the addressed member.

  Moreover, in embodiment mentioned above, the spacer interposed between a pair of flat plate is shown as an example of the spacer said to this invention. However, the present invention is not limited to this, and the spacer may be, for example, a screw, or may be a protrusion formed by deforming a part of a flat plate. Further, the spacer may be formed of an oil-resistant resin material, for example.

  In addition, as an example of the lubricant applicator according to the present invention, the above-described embodiments may be used together or replaced. For example, the pair of flat plates may have a configuration in which a distance between the pair of flat plates is maintained without using caulking or the like by being fixed to both ends of the spacer by adhesion or the like.

  In the embodiment described above, a tandem color printer is shown as an example of the image forming apparatus. However, the image forming apparatus referred to in the present invention is not limited to this, and may be a monochrome printer that does not have an intermediate transfer belt, for example.

  In the above-described embodiment, a printer is shown as an example of the image forming apparatus. However, the image forming apparatus referred to in the present invention is not limited to a printer, and may be, for example, a copying machine or a facsimile.

  In the above-described embodiment, a configuration using a charging roll and a laser exposure device is shown as an example of the image forming unit referred to in the present invention. However, the image forming unit referred to in the present invention is not limited to this, and may include, for example, a corona discharger such as corotron or scorotron instead of the charging roll, and includes a plurality of light emitting diodes instead of the laser exposure unit. It may have an array.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10Y, 10M, 10C, 10K Image forming part 60 Fixing device 61 Fixing belt 62 Pressure roll 63 Heating roll 64 Steering roll 65 Fixed pad 65a Addressing surface 66, 166 Lubricant applicator 661 Fiber body 661e End part 662 Case 662a, 662b Flat plate portion 663, 1663 Spacer 1664, 1665 Flat plate 1665s Connection portion

Claims (3)

A lubricant applicator for applying a liquid lubricant to a moving strip,
A pair of plate-like bodies arranged opposite to each other;
The lubricant is disposed between the pair of plate-like bodies and extends along the plate-like body, and has an end portion that contacts the belt-like body and protrudes from between the pair of plate-like bodies. Fiber body,
The fiber body is coupled to both of the pair of plate-like bodies so that the fiber body is separated from the other plate-like body when the fiber body is in a position in contact with one plate-like body of the pair of plate-like bodies. And a spacing maintaining body that maintains a spacing between the pair of plate-like bodies at a spacing larger than the thickness of the fibrous body. An endless strip that circulates,
An addressing member having an addressing surface addressed to the inner surface of the strip,
By pressing and rotating the outer surface of the band-shaped body toward the addressed surface, a medium holding an unfixed toner image is received between the band-shaped body and the toner image in cooperation with the band-shaped body. A roll to be fixed on the medium;
A lubricant applicator for applying a liquid lubricant to the inner surface of the strip,
The lubricant applicator is
A pair of plate-like bodies arranged opposite to each other;
The lubricant is disposed between the pair of plate-like bodies and extends along the plate-like body, and has an end portion that contacts the belt-like body and protrudes from between the pair of plate-like bodies. Fiber body,
The fiber body is coupled to both of the pair of plate-like bodies so that the fiber body is separated from the other plate-like body when the fiber body is in a position in contact with one plate-like body of the pair of plate-like bodies. And a spacing maintaining body that maintains a spacing between the pair of plate-like bodies at a spacing larger than the thickness of the fibrous body. An image forming unit for forming an unfixed toner image on a medium;
An endless strip that circulates,
An addressing member having an addressing surface addressed to the inner surface of the strip,
By pressing and rotating the outer surface of the band-shaped body toward the addressed surface, a medium holding an unfixed toner image is received between the band-shaped body and the toner image in cooperation with the band-shaped body. A roll to be fixed on the medium;
A lubricant applicator for applying a liquid lubricant to the inner surface of the strip,
The lubricant applicator is
A pair of plate-like bodies arranged opposite to each other;
The lubricant is disposed between the pair of plate-like bodies and extends along the plate-like body, and has an end portion that contacts the belt-like body and protrudes from between the pair of plate-like bodies. Fiber body,
The fiber body is coupled to both of the pair of plate-like bodies so that the fiber body is separated from the other plate-like body when the fiber body is in a position in contact with one plate-like body of the pair of plate-like bodies. And an interval maintaining body for maintaining an interval between the pair of plate-like bodies at an interval larger than the thickness of the fibrous body.

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