JP2011121702A - Medium clamping device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium clamping device for reducing the heights of burrs, and to provide an image forming device. <P>SOLUTION: The medium clamping device includes a first peripherally moving body having a peripheral face formed of a nitrided stainless material to peripherally move, a second peripherally moving body having a peripheral face formed of a nitrided stainless material to peripherally move so that a recording medium on the surface of which an image is formed passes between the peripheral face and the peripheral face of the first peripherally moving body, and a load imparting part for imparting a load to at least one of the first peripherally moving body and the second peripherally moving body to clamp the recording medium between the first peripherally moving body and the second peripherally moving body with the load. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a medium clamping device and an image forming apparatus.

  As an example of the medium clamping device provided in the image forming apparatus, there is shown a deburring device that sandwiches a sheet between a correction roll and a plate material and applies pressure when the sheet passes to crush the burr (for example, , See Patent Document 1).

JP 2008-254887 A

  An object of the present invention is to provide a medium holding device that can further reduce the burr height, and an image forming apparatus including such a medium holding device.

The medium clamping device according to claim 1 is:
A first rotating body having a peripheral surface made of a nitriding stainless steel material, the peripheral surface of which moves around, and
A recording medium having a peripheral surface made of a nitridized stainless material, the peripheral surface revolves around, and a recording medium on which an image is formed passes between the peripheral surface and the peripheral surface of the first rotating body. A second rotating body to perform,
A load applying unit that applies a load to at least one of the first and second rotating bodies to sandwich the recording medium with the first and second rotating bodies. It is characterized by having.

An image forming apparatus according to claim 2
A first rotating body having a peripheral surface made of a nitriding stainless steel material, the peripheral surface of which moves around, and
A recording medium having a peripheral surface made of a nitridized stainless material, the peripheral surface revolves around, and a recording medium on which an image is formed passes between the peripheral surface and the peripheral surface of the first rotating body. A second rotating body to perform,
A load applying unit that applies a load to at least one of the first and second peripheral members, and sandwiches the recording medium with the load by the first and second peripheral members; An image forming unit that forms an image on the surface of the recording medium that has passed between the peripheral surface of the first peripheral member and the peripheral surface of the second peripheral member is provided.

  According to the medium clamping device of the first aspect, the burr height is further reduced as compared with the case where the peripheral surface made of the nitrided stainless material is not provided.

  According to the image forming unit of the second aspect, the first circumferential body and the second circumferential body have a burr on the recording medium as compared with a case where the circumferential surface is not made of a nitrided stainless material. The resulting damage to the image forming unit can be further reduced.

1 is a schematic configuration diagram showing an embodiment of an image forming apparatus of the present invention. It is a perspective view which shows the deburring apparatus which is embodiment of the clamping apparatus of this invention. It is a perspective view which shows the state in the middle of taking out the apparatus main-body part of the deburring apparatus shown in FIG. 2 from a support part. It is a perspective view which shows the apparatus main body part shown in FIG. It is sectional drawing which shows schematic structure inside the apparatus main body part shown in FIG. It is sectional drawing which expands and shows the edge part of a paper. It is the perspective view which looked at the apparatus main-body part shown in FIG. 4 from another angle. It is a figure explaining the structure of a roll support mechanism. It is a figure explaining the operation | movement of roll evacuation. It is a figure which shows an upper deburring roll and a lower deburring roll. It is a figure which shows a strip | belt member. It is a top view which shows the position of a guide member, a deburring roll, and an auxiliary conveyance roll in an apparatus main body. It is a perspective view which shows a guide member. It is a disassembled perspective view of the support part shown in FIG. It is a perspective view which shows the support part of the assembled state. It is the perspective view which looked at the support part of the assembled state from another direction. It is sectional drawing explaining the support structure of the apparatus main body part by a support part. It is a graph which shows the burr | flash height before the process of a paper by the deburring apparatus, and after a process. 6 is a graph showing the amount of scratches generated on the belt of the fixing device in the image forming apparatus. It is a graph which shows the operation sound in each condition of a belt member. 6 is a graph showing a ratio of vibration of a frame of a deburring device and vibration of a support frame of an image forming apparatus. 6 is a graph showing a ratio of a vibration of a frame of an apparatus main body and a vibration of a support frame of an image forming apparatus in a comparative example.

Embodiments of the present invention will be described below with reference to the drawings.
[Image forming apparatus]
FIG. 1 is a schematic configuration diagram showing an embodiment of an image forming apparatus of the present invention.

  An image forming apparatus 1 shown in FIG. 1 forms an electrostatic latent image, develops it with toner, forms a toner image, and finally transfers and fixes the toner image on a sheet, thereby fixing toner on the sheet. An apparatus for forming an image composed of an image. The image forming apparatus 1 is an apparatus that supports not only paper, that is, a paper recording medium, but also a resin recording medium typified by an OHP sheet. However, in the following description, paper is used unless otherwise specified. It is assumed that the recording medium is described as a representative. The image forming apparatus 1 according to the present embodiment is a tandem type color printer in which six image forming units 10A, 10B, 10C, 10D, 10E, and 10F that perform image formation of different colors are arranged in parallel. In addition to printing an image, it is possible to print a color image composed of a plurality of color toner images. For example, among the six image forming units 10A to 10F, four image forming units 10C, 10D, 10E, and 10F are respectively yellow (Y), magenta (M), cyan (C), and black (K). Corresponding to each color, the remaining two image forming units 10A and 10B correspond to special colors other than YMCK. The spot colors include, for example, colors that cannot be accurately expressed by the above YMCK composition, such as colors representing a corporate color of a specific company, pastel colors, and glossy transparent colors. The image forming apparatus 1 includes six toner cartridges 18A, 18B, 18C, 18D, 18E, and 18F that store toners of colors corresponding to the image forming units 10A to 10F, respectively.

  Since the six image forming units 10A to 10F have the same configuration, the image forming unit 10F corresponding to black will be described by taking the image forming unit 10F as a representative. A charger 12 for charging the surface of the body 11, an exposure unit 13 for irradiating the photoreceptor 11 with exposure light based on an image signal supplied from the outside, a developing unit 14 for developing the surface of the photoreceptor 11 with toner, and a toner image And a primary transfer device 15 for transferring the toner image to the intermediate transfer belt. The photoconductor 11 has a cylindrical surface and rotates in the direction of arrow a around the axis of the cylinder.

  Further, the image forming apparatus 1 includes an intermediate transfer belt 20 to which a toner image is transferred from the photoreceptor 11 of the image forming units 10A to 10F, and a secondary transfer unit 30 to transfer the toner image from the intermediate transfer belt 20 to a sheet. A fixing device 40 for fixing the toner to the paper, a decurler 50 for correcting the winding of the paper, and a paper transport unit 60 for transporting the paper along the transport path R1 and the front / back reversing path R2. It includes paper containers 71 and 72 to be stored, a deburring device 80 that corrects paper burrs before image formation, and a posture correction unit 73 that corrects the posture of the paper. In addition, the image forming apparatus 1 includes a cooling unit 74 that cools the sheet after toner fixing, a discharge sheet storage unit 69 that receives a sheet on which image formation by the image forming apparatus 1 is completed, and each unit of the image forming apparatus 1. A control unit 90 for controlling is also provided.

  The intermediate transfer belt 20 is an endless belt-like member supported by belt support rolls 21, 22, and 23, and circulates and moves in the direction of arrow b passing through the image forming units 10 </ b> A to 10 </ b> F and the secondary transfer unit 30 in this order. To do. Here, the combination of the image forming units 10A to 10F, the intermediate transfer belt 20, the secondary transfer unit 30, and the fixing unit 40 corresponds to an example of the image forming unit referred to in the present invention.

  The paper transport unit 60 transports the paper along the transport path R1 and the front / back reversing path R2. The paper transport unit 60 includes take-out rolls 61 and 62 that take out paper from the paper containers 71 and 72, and a registration roll that sends the paper to the secondary transfer device 30 in accordance with the timing at which the secondary transfer device 30 transfers the toner image. 64, a belt conveyor 65 that conveys the sheet from the secondary transfer unit 30 to the fixing unit 40 while adsorbing the sheet to the outer peripheral surface of the belt 65a, a discharge roll 66 that discharges the sheet to the outside of the image forming apparatus 1, and a conveyance path. And a transport roll 68 that transports the paper, which is disposed along R1 and the front / back reversing path R2. For ease of viewing the drawing, in FIG. 1, a part of the transport roll 68 in the image forming apparatus 1 is given a reference numeral.

  The paper transport unit 60 transfers the paper from the paper containers 71 and 72 to the transport path R1 through the deburring device 80, the posture correcting unit 73, the secondary transfer device 30, the fixing device 40, the cooling unit 74, and the decurler 50 in order. Convey along. Further, when performing double-sided printing in the image forming apparatus 1, the paper transport unit 60 transports the paper along the front / back reversing path R2 that branches from the transport path R1 and returns to the transport path R1, and passes through the front / back reversing path R2. The front and back surfaces are reversed by turning the paper in the middle. The sheet whose front and back sides are reversed returns to the transport path R1, passes through the deburring device 80 and the posture correcting unit 73 again, and the secondary transfer unit 30 transfers the toner image to the back side, that is, the side where the toner image has not been transferred.

  The basic operation of the image forming apparatus 1 shown in FIG. 1 will be described. As a representative example, the image forming unit 10F corresponding to black (K) will be described. The photoconductor 11 is rotationally driven in the direction of arrow a, and a charge is applied to the surface of the photoconductor 11 by the charger 12. The exposure device 13 forms an electrostatic latent image by irradiating the photoconductor 11 with exposure light based on an image signal supplied from the outside. More specifically, the exposure device 13 forms an electrostatic latent image on the surface of the photoconductor 11 by irradiating exposure light corresponding to data corresponding to black in the image signal. The developing device 14 develops the electrostatic latent image with black toner to form a toner image. Toner is supplied from the toner cartridge 18F to the developing device 14 of the image forming unit 10F. The photoconductor 11 receives the formation of the toner image and holds the toner image. The toner image formed on the surface of the photoreceptor 11 is transferred to the intermediate transfer belt 20 by the primary transfer unit 15.

  The five image forming units 10A to 10E corresponding to colors other than black also form toner images corresponding to the respective colors in the same manner as the image forming unit 10F corresponding to black. The intermediate transfer belt 20 is supported by the support rolls 21 to 23 and circulates in the direction of the arrow b, and the image forming units 10A to 10F transfer the toner images of the respective colors on the intermediate transfer belt 20 in a superimposed manner. I will do it. A toner image corresponding to the image data is thus formed on the intermediate transfer belt 20 and moves while holding the toner image.

  On the other hand, the sheets in the sheet containers 71 and 72 are taken out by the take-out rolls 61 and 62, and are conveyed by the conveyance roll 68 and the registration roll 64 in the direction of the arrow c toward the secondary transfer unit 30 along the conveyance path R1. . The deburring device 80 arranged in the middle of the transport path R1 removes burrs existing at the edge of the sheet, and the attitude correcting unit 73 corrects the attitude and position of the sheet. The secondary transfer device 30 transfers a toner image on the intermediate transfer belt 20 to a sheet by applying a transfer bias potential between the intermediate transfer belt 20 and the sheet. The toner image is finally transferred onto the paper by the secondary transfer device 30. The sheet is further conveyed in the direction of arrow d by the belt conveyer 65, and the toner image transferred onto the sheet is fixed by the fixing unit 40. In this way, an image is formed on the paper. The fixing device 40 has a fixing belt 410 to increase the heat capacity. The sheet on which the image is formed is cooled by the cooling unit 74, the winding is corrected by the decurler 50, and then discharged by the discharge roll 66.

When double-sided printing is performed in the image forming apparatus 1, the paper transport unit 60 transports the paper transported along the transport path R1 this time along the front / back reversing path R2, reverses the front and back surfaces, and then again. It is transported along the transport path R1. In addition, although it is not double-sided printing, when it is specified that the paper is reversed and discharged, the paper transport unit 60 temporarily retracts the paper transported along the transport path R1 to the middle of the front / back reverse path R2. Then, it is transported in the opposite direction and discharged. The discharged paper is stacked in the discharged paper storage unit 69.
[Deburring device]
FIG. 2 is a perspective view showing a deburring device which is an embodiment of the clamping device of the present invention.

  A deburring device 80 shown in FIG. 2 is disposed below the image forming units 10A, 10B, 10C, 10D, 10E, and 10F and the secondary transfer device 30 in the image forming apparatus 1 shown in FIG. It is attached to a support frame F that supports the entire structure of the forming apparatus 1. The deburring device 80 includes an apparatus main body 80A and a support portion 80B that supports the apparatus main body 80A. The deburring device 80 is also provided with a motor unit 80C (see FIG. 16) described later.

  The support portion 80B is attached to the support frame F of the image forming apparatus 1, and supports the apparatus main body 80A in a detachable manner with respect to the image forming apparatus 1. The direction in which the apparatus main body 80A transports the paper is referred to as a transport direction X (or a passing direction X). A direction along the width of the conveyed sheet that intersects the conveyance direction X is referred to as a width direction Y. A direction intersecting with the transport direction X and the width direction Y is referred to as a vertical direction Z.

  FIG. 3 is a perspective view showing a state in the middle of taking out the device main body of the deburring device shown in FIG. 2 from the support.

  The support portion 80B is provided with a rail 891 extending in the width direction Y, and a rail 811 extending in the width direction Y corresponding to the rail of the support portion 80B is provided above the apparatus main body 80A. . The rails of the support portion 80B are formed by bending the edges of the support portion 80B outward toward both sides in the transport direction X, and two rails are provided on both sides in the transport direction X of the support portion 80B. The rail 891 of the apparatus main body 80A is formed by bending the upper portion of the frame 81 that supports the structure of the entire apparatus main body 80A inward, that is, in a direction facing each other. Two are provided corresponding to the rails 811 of the support portion 80B. The rail 811 of the apparatus main body 80A rides on the rail 891 of the support portion 80B. The rail 811 of the apparatus main body 80A moves while sliding on the rail 891, so that the apparatus main body 80A moves in the width direction Y in which the rail 891 extends. When the operator removes, for example, paper jammed inside, the apparatus main body 80A is pulled out from the image forming apparatus 1 by being pulled out in the width direction Y by the operator. Further, the apparatus main body 80A is attached to the image forming apparatus 1 by being pushed in the width direction Y. The frame 81 that supports the structure of the apparatus main body 80A is provided with a protrusion 812 for positioning the apparatus main body 80A with respect to the support portion 80B when the apparatus main body 80A is mounted.

The support portion 80B supports the apparatus main body 80A via a buffer mechanism incorporated therein, but the structure of the support portion 80B will be described later, and the apparatus main body 80A will be described first.
[Device body]
FIG. 4 is a perspective view showing the apparatus main body shown in FIG. FIG. 5 is a cross-sectional view showing a schematic structure inside the apparatus main body shown in FIG.

  The apparatus main body 80A shown in FIGS. 4 and 5 includes a pair of deburring rolls 82A and 82B, a pair of auxiliary conveying rolls 83A and 83B, a sheet guiding portion 84 and 85 for guiding sheets, and a pair of deburring rolls 82A. , 82B, a roll support mechanism 86 that supports one deburring roll 82A, and a frame 81 that supports the structure of each part of the apparatus main body 80A. The apparatus main body 80A is also provided with a paper sensor S for detecting the passage of paper. The apparatus main body 80A first passes the supplied paper through the auxiliary conveyance rolls 83A and 83B while guiding the paper to the paper guide unit 84, and then passes between the deburring rolls 82A and 82B. The guide unit 85 guides and discharges.

  The pair of deburring rolls 82A and 82B are provided to face each other at a position where the sheet is sandwiched from above and below. The deburring rolls 82A and 82B function as a first rotating body and a second rotating body whose peripheral surfaces move around. Of the deburring rolls 82A and 82B, the lower deburring roll 82B disposed on the lower side is a drive roll, and is driven to rotate by a deburring drive motor 801 (see FIG. 16). The upper deburring roll 82A disposed on the upper side is a driven roll, and is driven to rotate in the same direction as the lower deburring roll 82B at the position where the sheet is sandwiched by contacting the rotating lower deburring roll 82B. . FIG. 4 shows a grip 821 for manually rotating the lower deburring roll 82B to the operator when removing the paper when the paper is jammed.

  The pair of auxiliary transport rollers 83A and 83B are members that rotate by sandwiching the paper and transport the paper. Even when the deburring rolls 82A and 82B are separated from each other, which will be described later, the paper is conveyed by the auxiliary conveyance rolls 83A and 83B. Of the pair of auxiliary conveyance rolls 83A and 83B, the lower auxiliary conveyance roll 83B disposed on the lower side is a driving roll, and the upper auxiliary conveyance roll 83A disposed opposite to the lower auxiliary conveyance roll 83B is a driven roll. It is. The lower auxiliary transport roll 83B is driven by a deburring drive motor 801 (see FIG. 16) via a gear (not shown) coupled to the lower deburring roll 82B.

  A load toward the lower deburring roll 82B is applied to the upper deburring roll 82A, and a sheet is sandwiched between the upper deburring roll 82A and the lower deburring roll 82B so that an end portion of the sheet is obtained. The burr height of the burr existing in the

  FIG. 6 is an enlarged cross-sectional view showing the end of the paper.

When the paper P is cut from the base paper, burrs B raised by the cutting are formed at the ends. The burrs B are usually formed at the ends of the four sides of the paper. When a sheet having burrs is supplied to the secondary transfer unit 30 and the fixing unit 40, the intermediate transfer belt 20 and the fixing belt 410 of the fixing unit 40 are hit by burrs, resulting in scratches and image defects due to the scratches. Occurs. When the sheet is sandwiched between the upper deburring roll 82A and the lower deburring roll 82B, the deburring B of the sheet is crushed and the burr height H is lowered. Further, the corners of the burrs B are deformed and smoothed. The sheet that has passed between the upper deburring roll 82A and the lower deburring roll 82B by the deburring device 80 is supplied to the secondary transfer device 30 and the fixing device 40 to form an image. The deburring device 80 supplies the secondary transfer device 30 and the fixing device 40 arranged on the downstream side of the deburring device 80 with the paper having the burr B smoothed and the burr height H lowered. Generation and image defects due to scratches are reduced.
[Roll support mechanism]
Next, a mechanism for supporting the deburring rolls 82A and 82B will be described.

  FIG. 7 is a perspective view of the apparatus main body shown in FIG. 4 as seen from another angle. Moreover, FIG. 8 is a figure explaining the structure of a roll support mechanism.

  A bearing 822B that supports the rotating shaft of the lower deburring roll 82B is fixed to the frame 81. A load is applied to the upper deburring roll 82A by the roll support mechanism 86 with respect to the lower deburring roll 82B. The roll support mechanism 86 includes a roll support arm 861 that supports the rotation shaft of the upper deburring roll 82A, a spring member 862 that presses the roll support arm 861, a bolt 863 that holds down the spring member 862, and a roll support arm 861 that moves up and down. And a retract motor 865 (see FIG. 8) that rotationally drives the cam 864. The roll support arm 861, the spring member 862, the bolt 863, and the cam 864 are provided in pairs on both sides in the width direction Y of the apparatus main body 80A. The roll support arm 861 supports the upper deburring roll 82A from both sides.

The roll support arm 861 is supported by a rotation shaft 861P fixed to the frame 81, and is rotatable with respect to the frame 81 about the rotation shaft 861P. A bearing 822A that supports the rotation shaft of the upper deburring roll 82A is fixed to the roll support arm 861. That is, the upper deburring roll 82 </ b> A is supported by the roll support arm 861.
[Loading part]
The spring member 862 is sandwiched between a head of a bolt 863 attached to the frame 81 and a pin 861B provided on the roll support arm 861. The spring member 862 is a compression spring, is pressed from above by a bolt 863, and presses the roll support arm 861 downward via a pin 861B. Due to this pressing force, a downward load toward the lower deburring roll 82B is applied to the upper deburring roll 82A supported by the roll support arm 861.

In the roll support arm 861, the distance from the rotation shaft 861P of the pin 861B that receives the load of the spring member 862 is longer than the distance from the rotation shaft 861P of the upper deburring roll 82A. More specifically, the distance from the rotation shaft 861P to the pin 861B is about five times the distance from the rotation shaft 861P to the upper deburring roll 82A. For this reason, due to the lever principle, a larger load is applied to the upper deburring roll 82 </ b> A than the load by which the spring member 862 presses the roll support arm 861. The magnitude of the load is adjusted by tightening the bolts 863, and a load of 55 kg is applied between the upper deburring roll 82A and the lower deburring roll 82B. At this time, the spring member 862 has a smaller load corresponding to the distance from the rotation shaft 861P than the load applied to the upper deburring roll 82A, more specifically, the load applied to the upper deburring roll 82A. About 1/5 of the load is applied to the pin 861B. In this way, the roll support arm 861, the spring member 862, the bolt 863, and the pin 861B function as a load applying unit, and by applying a load to the upper deburring roll 82A, the upper deburring roll 82A and the lower side The paper is clamped with the load by the deburring roll 82B. As a means for applying the load, a configuration in which an upward load is applied to the lower deburring roll 82B instead of the upper deburring roll 82A, or a configuration in which a load is applied to both rolls may be employed. Further, as a means for applying the load, a structure in which the load is directly applied to the shaft of the roll with a spring or the like without using the roll support arm can be adopted although the spring member is enlarged.
[Evacuation operation]
FIG. 8 shows a sandwiched state in which the upper deburring roll 82A and the lower deburring roll 82B sandwich the sheet. When the cam 864 rotates from this sandwiched state, the upper deburring roll 82A retracts from the lower deburring roll 82B and enters a separated state. Next, a mechanism for changing the state will be described.

  A cam follower 861A is provided at the end of the roll support arm 861 opposite to the rotation shaft 861P, and the cam 864 is in contact with the roll support arm 861 via the cam follower 861A. The cam 864 is an eccentric cam, and a notch 864B is provided at a position farthest from the rotation shaft 864A on the cam surface. The cam 864 is driven to rotate by a retract motor 865 under the control of the control unit 90 (see FIG. 1). More specifically, the retract motor 865 drives the cam 864 by driving a gear 866 (see FIG. 5) having a rotation shaft 864A common to the cam 864. A semicircular blade member 867 corresponding to the displacement of the cam 864 is also attached to the rotation shaft 864A of the cam 864. The blade member 867 rotates in conjunction with the cam 864 to represent the rotational posture of the cam 864. The sensor 868 detects the passage of the blade member 867 and transmits a signal representing the detection result to the control unit 90 (see FIG. 1). Based on the signal from the sensor 868, the control unit 90 rotates the cam 864 to assume a predetermined posture.

  FIG. 9 is a diagram for explaining the roll evacuation operation.

  When the retract motor 865 drives the cam 864 to rotate, the cam 864 pushes up the roll support arm 861 against the pushing load applied by the spring member 862. The blade member 867 rotates in conjunction with the cam 864. After detecting the passage of the blade member 867 by the sensor 868, the control unit 90 stops the rotation of the cam 864 by the retract motor 865. As a result, the cam 864 rotates halfway and contacts the cam follower 861A at the farthest point from the center of rotation as shown in FIG. The cam follower 861A enters the notch 864B provided at the farthest point from the rotation center of the cam 864, so that the cam 864 becomes stable even at the farthest point. Thus, the retract motor 865, the cam 864, and the roll support arm 861 function as a switching unit, and a separated state in which the upper deburring roll 82A and the lower deburring roll 82B are separated from each other, and the upper deburring roll 82A. The lower deburring roll 82 </ b> B switches between the sandwiching states in which the recording medium is sandwiched. By rotation of the cam 864, the roll support arm 861 is pushed up and rotates upward about the rotation shaft 861P, and the upper deburring roll 82A is retracted from the lower deburring roll 82B. In the separated state, the upper deburring roll 82 </ b> A and the lower deburring roll 82 </ b> B are separated from each other to prevent the paper from being pinched. In the separated state, the upper deburring roll 82A and the lower deburring roll 82B are separated from each other by a distance sufficiently larger than the maximum sheet thickness that can be processed by the image forming apparatus 1, and do not convey the sheet. At this time, the sheet is conveyed to the auxiliary conveying rolls 83A and 83B and passes between the upper deburring roll 82A and the lower deburring roll 82B.

  When the retract motor 865 further rotates the cam 864 half a half based on the control unit 90 from the separated state shown in FIG. 9, the cam 864 contacts the cam follower 861A at the closest point from the center of rotation. As a result, the upper deburring roll 82A and the lower deburring roll 82B are in a sandwiched state in which the sheet is sandwiched (see FIG. 8). In the sandwiched state shown in FIG. 8, the cam 864 and the cam follower 861A may be separated.

  The state transition between the sandwiched state shown in FIG. 8 and the separated state shown in FIG. 9 is controlled by the control unit 90 (see FIG. 1). The control unit 90 controls the operation of the retract motor 865 by executing a program stored in a memory (not shown) by a processor. The control unit 90 acquires the type of the recording medium based on the operator's input operation and data supplied from the outside of the image forming apparatus 1, and acquires the processing state of the recording medium in each unit of the image forming apparatus 1. The sandwiching state and the separation state are determined. In this way, the state of the upper deburring roll 82A and the lower deburring roll 82B is switched depending on the type of recording medium passing between the upper deburring roll 82A and the lower deburring roll 82B. The control unit 90 controls the entire image forming apparatus 1, but may be provided independently for the deburring device 80.

  In the deburring device 80 of the present embodiment, when the recording medium is a paper, that is, a paper medium, and has a basis weight smaller than a predetermined basis weight, the upper deburring roll 82A and the lower deburring roll 82B are used. Are separated from each other. More specifically, when the basis weight is 157 gsm or more, the upper deburring roll 82A and the lower deburring roll 82B are sandwiched, and when the basis weight is less than 157 gsm, they are separated. Here, the basis weight of 157 gsm corresponds to a thickness of about 150 μm in a general paper. A sheet having a basis weight of less than 157 gsm may be wrinkled by being sandwiched between the upper deburring roll 82A and the lower deburring roll 82B. On the other hand, the sheet having a basis weight of less than 157 gsm is softer than the sheet having a basis weight of 157 gsm or more, and is disposed downstream of the deburring device 80 such as the intermediate transfer belt 20 and the fixing belt 410 (see FIG. 1). The degree to which the formed member is damaged is low. Therefore, the upper deburring roll 82A and the lower deburring roll 82B are separated from each other with respect to a sheet having a basis weight of less than 157 gsm, and pinching is prevented.

  Further, when the recording medium that passes is a paper medium and the width in the width direction Y (FIG. 2) is less than 320 mm, or when the recording medium is a resin material medium such as an OHP sheet and a resin film, Since there is a low possibility of wrinkling as compared with a paper having a width of 320 mm or more, the deburring device 80 puts the upper deburring roll 82A and the lower deburring roll 82B into a sandwiched state and scratches on the members disposed downstream. Reduce.

Further, in the image forming apparatus 1 shown in FIG. 1, when images are formed on both sides of a sheet, the sheet having an image formed on one of the front and back sides is conveyed along the front / back reversing path R2 and reversed. In this state, after passing through the deburring device 80, an image is formed on the opposite surface. In this case, the paper on which the image has already been formed on one of the front and back surfaces is pressed against the upper deburring roll 82A and the lower deburring roll 82B, thereby preventing the image on the paper from being disturbed. The deburring roll 82A and the lower deburring roll 82B are in a separated state regardless of the type of paper.
[Deburring roll]
Here, the upper deburring roll 82A and the lower deburring roll 82B will be described.

  FIG. 10 is a view showing an upper deburring roll and a lower deburring roll. FIG. 10 shows a view in which the upper deburring roll 82A and the lower deburring roll 82B in the posture installed in the deburring device 80 are viewed in the transport direction X. FIG. 10 also shows a deburring drive motor 801 and a gear 803 that drive the lower deburring roll 82B in a state where the apparatus main body 80A (see FIG. 3) is mounted on the support portion 80B.

  The upper deburring roll 82A and the lower deburring roll 82B respectively include roll main body portions 823A and 823B and rotating shafts 824A and 824B having peripheral surfaces that contact the paper. The rotation shafts 824A and 824B are fixed to both sides of the roll main body portions 823A and 823B and supported by the bearings 822A and 822B. The peripheral surfaces of the roll main body portions 823A and 823B Move around.

  Each of the roll main body portions 823A and 823B is a hollow cylinder having a diameter of 35 mm and formed of a metal material harder than paper. More specifically, each of the roll main body portions 823A and 823B is made of stainless steel, and the surface is nitrided. More specifically, the surface of each of the roll main body portions 823A and 823B is soft-nitrided. Each of the roll main body portions 823A and 823B has a direction perpendicular to the circumferential movement direction R of the peripheral surface, that is, the length in the width direction Y in this embodiment is between the upper deburring roll 82A and the lower deburring roll 82B. Is longer than the length in the width direction Y of the sheet conveyed.

Each of roll body parts 823A and 823B has a harder surface due to nitriding. For this reason, the roll body portions 823A and 823B are less likely to be deformed when the paper is sandwiched between them, and apply higher pressure to the burr. Accordingly, the burr height of the paper is further reduced as compared with the case where the nitriding treatment is not performed.
[Strip member]
Of the upper deburring roll 82A and the lower deburring roll 82B, the upper deburring roll 82A is provided with a belt member 825 at a location outside the region D that contacts the paper on the peripheral surface of the roll body 823A. Yes. The band member 825 is a region D in which the maximum size of paper that can be processed by the image forming apparatus is in contact with the maximum size of the deburring roll 82B when passing between the upper deburring roll 82A and the lower deburring roll 82B. The peripheral surface of the roll body 823A is surrounded on both sides of the roll. In FIG. 10, in order to describe the band member 825, the thickness of the band member 825 is illustrated as being extremely expanded.

  The band member 825 is softer than the roll main body 823A, and is thinner than the sheet having the minimum thickness (150 μm) among the sheets to be deburred by the deburring device 80. More specifically, the belt member 825 is thinner than the thickness (about 100 μm) of plain paper that is widely used as copy paper.

  The band member 825 is a tape with ends that surrounds the circumferential surface of the roll body 823A in a single layer. Both ends of the belt member 825 are close to each other with a non-orthogonal boundary with respect to the circumferential direction R. More specifically, both ends of the belt member 825 extend at an angle of 45 ° with respect to the circumferential direction R.

  FIG. 11 is a diagram illustrating a belt member. FIG. 11 shows a band member in a state before being attached to the upper deburring roll 82A. Part (A) in FIG. 11 is a plan view and part (B) is a side view.

  The band member 825 has a base layer 8251 made of a resin material and an adhesive layer 8252 that adheres the base layer to the peripheral surface. More specifically, the base layer 8251 is a polyimide tape having a thickness of 50 μm, and the adhesive layer 8252 is an adhesive having a thickness of 30 μm. Therefore, the thickness of the entire band member 825 is 80 μm. In addition, as a material for the base layer, polyurethane or polycarbonate that is softer than the roll main body portion 823A can also be used. However, the base material made of polyimide has high friction durability compared to other resin materials in addition to the reduction of operation sound. In addition, by setting the thickness of the polyimide base material to 50 μm, it is possible to avoid peeling of the edge due to the hardness and elasticity of the base material when wound around a roll, compared to the case where the thickness is thicker than 50 μm. Is done.

  When the roll body portion 823A of the upper deburring roll 82A and the roll body portion 823B of the lower deburring roll 82B are in the above-described sandwiched state and no sheet is sandwiched therebetween, the belt member 825 is sandwiched therebetween. And do not touch directly. When the deburring device 80 performs the deburring operation of the paper, the upper deburring roll 82A and the lower deburring roll 82B sandwich the paper so that the interval between the peripheral surfaces depends on the thickness of the paper. Spread. When the trailing edge of the paper passes between the upper deburring roll 82A and the lower deburring roll 82B, the upper deburring roll 82A is moved toward the lower deburring roll 82B by the load of the spring member 862 (see FIG. 8). Return to. At this time, an impact due to the collision occurs, but if the hard peripheral surfaces of the roll main body portion 823A and the roll main body portion 823B collide with each other, a large impact occurs, and the impact sound also becomes noise. Further, if the impact propagates to the image forming units 10A, 10B, 10C, 10D, 10E, 10F and the secondary transfer unit 30 of the image forming apparatus, it may cause image disturbance.

  When the belt member 825 is provided, when the rear end of the sheet passes between the upper deburring roll 82A and the lower deburring roll 82B, the roll body portion 823B of the lower deburring roll 82B becomes the upper deburring roll 82A. It corresponds to the belt member 825 of the roll main body portion 823A. The impact is absorbed by the band member 825 that is softer than the upper deburring roll 82A and the lower deburring roll 82B.

  The band member 825 is thinner than the paper having the maximum thickness. Accordingly, when the sheet passes between the upper deburring roll 82A and the lower deburring roll 82B, the sheet is sandwiched by the applied load regardless of the belt member 825, so that the correction of burrs is hindered. Executed without.

In the state where there is no sheet to pass through, the upper deburring roll 82A rotates while the band member 825 is in contact with the roll main body 823B of the lower deburring roll 82B, but both ends of the band member 825 are in the circumferential direction R. Therefore, the roll body portion 823B of the lower deburring roll 82B rolls smoothly on the band member 825 from one end to the other end. Therefore, the vibration accompanying the rotation of the lower deburring roll 82B in the absence of the recording medium is reduced as compared with, for example, a case where both ends are orthogonal to the circumferential direction R.
[Paper Guide]
Next, the paper guide units 84 and 85 will be described.

  FIG. 12 is a plan view showing positions of the guide member, the deburring roll, and the auxiliary transport roll in the apparatus main body. FIG. 12 shows only the sheet guide portions 84 and 85, the upper deburring roll 82A, and the upper auxiliary conveyance roll 83A.

  The sheet guide portions 84 and 85 are respectively arranged on the upstream side and the downstream side in the transport direction X of the upper deburring roll 82A. The sheet guide portion 84 disposed on the upstream side and the sheet guide portion 85 disposed on the downstream side have the same structure except for the length in the transport direction X, and a pair of plate-like members 841 and 842 are provided. And protruding members 843 and 844 sandwiched between the plate-like members 841 and 842.

  FIG. 13 is a perspective view showing a guide member. FIG. 13 shows a sheet guide unit 85 arranged on the downstream side in the transport direction X of the two sheet guide units 84 and 85.

  The sheet guide unit 85 includes a pair of plate-like members 851 and 852 and protruding members 853 and 854 sandwiched between the plate-like members 851 and 852.

  Each of the plate-like members 851 and 852 is a plate-like shape extending along the front and back surfaces of the paper passing between the upper deburring roll 82A and the lower deburring roll 82B, and a pair of plate-like members 851 and 852. Is provided so as to sandwich a path D through which the sheet passes in a vertical direction Z intersecting the front and back surfaces of the sheet. The protruding members 853 and 854 are plate-like members filling the space between the plate-like members 851 and 852 at both ends in the width direction Y of the plate-like members 851 and 852, and the pair of plate-like members 851 and 852 are connected to each other. It is kept evenly spaced.

  Returning to FIG. 12 and continuing the description, the paper advances along the passage route D while being guided by the paper guide portion 84 and passes between the pair of auxiliary transport rolls 83A and 83B. The paper passes between the rolls 82A and 82B, and is guided by the paper guide unit 85 and discharged.

  Here, the pair of protruding members 853 and 854 provided in the sheet guide portion 85 are aligned with the pair of belt members 825 in the transport direction X, which is the sheet passing direction, and with respect to the passage path D. Thus, it is disposed at a position protruding from the pair of band members 825. In addition, each of the protruding members 853 and 854 protrudes at a position where the downstream end in the transport direction X is closer to the passage path D than the upstream end in the transport direction X. For this reason, the position of the sheet that has entered the vehicle after passing through the passage route D is corrected toward the passage route D.

For example, when removing the jammed paper in the deburring device 80, the operator may grab and pull out the jammed portion of the jammed paper 80 from the deburring device 80, but the paper is pulled out in the transport direction X. However, it may be pulled obliquely with respect to the transport direction X so as to be pulled toward the operator. In this case, the sheet hits the protruding members 853 and 854 protruding from the band member 825, and contact with the band member 825 is avoided. Further, even when the deburring device 80 is operating normally, when the sheet is supplied to the deburring device 80 in a posture inclined with respect to the transport direction X, the sheet is more than the belt member 825. Contact with the belt member 825 is avoided by hitting the protruding members 853 and 854 that protrude. Therefore, a situation in which the band member 825 softer than the deburring rolls 82A and 82B comes into contact with the paper and is damaged or broken is avoided.
[Supporting part]
Next, the support portion 80B that supports the apparatus main body 80A will be described.

  FIG. 14 is an exploded perspective view of the support portion shown in FIG.

  The support portion 80 </ b> B includes a fixing portion 87, a buffer member 88 attached to the fixing portion 87, and a rail member 89 attached to the buffer member 88.

  The fixing unit 87 is fixed to the support frame F of the image forming apparatus 1. More specifically, the fixing pieces 871 and 872 provided at both ends of the fixing portion 87 extending in the width direction Y are screwed to the support frame F, whereby the fixing portion 87 is fixed to the support frame F.

  Four buffer members 88 are arranged in four locations on the fixing portion 87. Each of the buffer members 88 has a structure in which a pair of fixing plates 882 and 883 for fixing the buffer material by screws are bonded to the upper and lower sides of a urethane resin buffer material 881. The buffer material 881 has a height of 15 mm. In FIG. 14, reference numerals 881 to 883 are attached to one of the four buffer members 88 for easy viewing.

  The rail member 89 is a member attached to the buffer member 88, and the rail member 89 is screwed to the fixing plate 883 of each buffer member 88 in a state of being placed on the buffer member 88. The rail member 89 is provided with a rail 891 extending in the width direction Y. The rail member 89 is provided with a pair of rails 891 on both sides in the transport direction X. In FIG. 14, one of these rails 891 is shown.

  FIG. 15 is a perspective view showing the support portion in an assembled state. FIG. 16 is a perspective view of the support portion in an assembled state as seen from another direction. FIG. 16 shows a state where a deburring drive motor and a gear are also attached to the support portion shown in FIG.

  The rail member 89 is mounted on and attached to the buffer member 88 attached to the fixing portion 87 shown in FIG. 14, whereby the support portion 80B shown in FIG. 15 is assembled. Further, when the motor unit 80C is attached to the rail member 89 of the support portion 80B shown in FIG. 15, the state shown in FIG. 16 is obtained. A motor unit 80C shown in FIG. 16 uses a deburring drive motor 801, a fixing frame 802 for fixing the deburring drive motor 801 to the rail member 89, and a driving force of the deburring drive motor 801 as a lower deburring roll 82B. And a gear 803 for transmitting to the motor. The motor unit 80C is fixed to the rail member 89 of the support portion 80B via a fixed frame 802. The rail member 89 of the support portion 80B is provided with a positioning portion 892 for positioning the apparatus main body 80A (see FIG. 4) with respect to the rail member 89. More specifically, the positioning portion 892 is a hole formed in the rail member 89.

  16 is attached to the inside of the image forming apparatus 1 by fixing the fixing pieces 871 and 872 of the fixing portion 87 to the support frame F.

  In order for the operator to attach the apparatus main body 80A to the support portion 80B, the ends of a pair of rails 811 (see FIG. 4) provided on the upper portion of the frame 81 of the apparatus main body 80A are connected to the pair of support portions 80B. It is placed on the end of the rail 891, respectively. Thereafter, as shown in FIG. 3, the operator pushes in and attaches the apparatus main body 80A. A gear 803 of the motor unit 80C is connected to the lower deburring roll 82B.

  The frame 81 of the apparatus main body 80A is provided with a protrusion 812 (FIG. 3) protruding in the width direction Y. When the apparatus main body 80A is mounted, the protrusion 812 is provided in the positioning portion provided on the rail member 89. The apparatus main body 80 </ b> A is positioned with respect to the rail member 89 by fitting with 892.

  The impact generated when the roll body 823A and the roll body 823B are sandwiched is absorbed and reduced by the band member 825 of the roll body 823A as described above. However, if a shock that cannot be absorbed completely and a vibration caused by the operation of the apparatus main body 80A other than the shock propagates to the image forming units 10A, 10B, 10C, 10D, 10E, and 10F and the secondary transfer device 30, the image is disturbed. It can also be a cause. The support portion 80B relaxes the propagation of shock and vibration by a buffer mechanism incorporated therein. In the following description, vibration is included in the impact unless otherwise specified.

  FIG. 17 is a cross-sectional view illustrating a support structure of the apparatus main body portion by the support portion.

  As shown in FIG. 17, when the apparatus main body 80A is mounted on the support portion 80B, the buffer member 88 is placed on the fixing portion 87 fixed to the support frame F (see FIG. 16) of the image forming apparatus 1. A rail member 89 is placed on the buffer member 88. Further, a rail 811 of the apparatus main body 80A is placed on the rail 891 of the rail member 89. If the rail member has a structure in which the rail member is suspended below the fixed portion via the buffer member, the buffer member may be broken by the pulling force due to the weight of the apparatus main body or the bonded portion may be peeled off. In the structure shown in FIG. 17, the support structure of the apparatus main body 80 </ b> A is reinforced compared to the structure in which the rail member is suspended below the fixed portion via the buffer member. Further, as already described, the apparatus main body 80A is positioned with respect to the rail member 89 by the protrusion 812 (see FIG. 3) and the positioning portion 892 (FIG. 16), and the motor unit 80C is also fixed to the support portion 80B. Yes.

The shock generated in the apparatus main body 80 </ b> A from the rail member 89 to the fixed portion 87 is reduced by the buffer member 88. Therefore, impact propagating from the apparatus main body 80A to the image forming units 10A, 10B, 10C, 10D, 10E, and 10F and the secondary transfer device 30 is reduced. As a result, the disturbance caused by the impact of the image formed on the paper is reduced. Although the cushioning material 881 has been described as being made of urethane resin, rubber or a spring can be employed as the cushioning material in addition to the urethane resin.
[Example]
An image forming apparatus of an example based on the above-described embodiment was created, and characteristics were measured.
[Measurement of burr height]
The paper was passed through the deburring device, and the burr height H (FIG. 6) of the burr of the paper before passing and the burr height H of the burr of the paper after passing were measured.

  FIG. 18 is a graph showing the burr height before and after the paper processing by the deburring device.

As shown in the graph, the burr height after the deburring process was lower than that before the deburring process.
[Evaluation of scratches on the latter part]
Next, the case where the deburring process is performed by the deburring apparatus and the case where the deburring process is not performed occur in the fixing belt 410 of the fixing device 40 (see FIG. 1) provided downstream of the deburring apparatus. The amount of wounds was investigated. The amount of scratches generated on the belt was visually evaluated from 0 (a level where no scratches were observed) to 5 in increments of 0.5.

  FIG. 19 is a graph showing the amount of scratches generated on the belt of the fixing device in the image forming apparatus. The horizontal axis of the graph indicates the number of sheets processed by the image forming apparatus, and the number indicates 1000 sheets (kPV).

As shown in FIG. 19, when the deburring process was not performed (no deburring), the grade representing the amount of scratches generated on the belt of the fixing device increased to 2 at the stage where 5000 sheets were processed, and 10000 sheets The grade increased to 4 at the stage of treatment. On the other hand, when the deburring process was performed (with deburring), the grade did not reach 2 even when the 40,000 sheets were processed.
[Measurement of noise under various conditions of strip members]
Next, the influence of the band member 825 provided on the upper deburring roll 82A on the operation sound and the durability of the band member were examined.

  With respect to the image forming apparatus of Example 1 based on the above-described embodiment, steady sound during the deburring operation was measured. The band member in Example 1 is composed of a base layer made of polyimide having a thickness of 50 μm and an adhesive layer having a thickness of 30 μm. As another material, Example 2 having the same thickness and a base layer made of polyurethane was prepared. Further, Example 3 in which the base layer is polyimide but the thickness is 70 μm was prepared. Further, Example 4 having the same thickness as Example 3 and a base layer made of polycarbonate was prepared. In Examples 3 and 4, in order to make the height of the band member thinner than the thickness of the target recording medium, the thickness of the adhesive layer was set to 10 μm. Furthermore, the comparative example without a band member (tape) was created. These Examples 1-4 and the comparative example were operated and the stationary sound was measured.

  FIG. 20 is a graph showing the operation sound in each condition of the belt member.

As shown in the graph, compared to the comparative example without the band member, Examples 1 to 4 having the band member had lower steady sound levels.
[Durability test of strip members]
Here, durability was tested about the belt member in the said Examples 1-4. As the durability, the adhesive strength of the belt member and the wear resistance were measured.

  The adhesive strength was measured for Examples 1 to 4, after the strip member was bonded to the upper deburring roll, left for 24 hours, and the force when peeling the strip member by the 90 ° peel method was measured as the adhesive strength. The measurement result of the adhesive force was as follows.

Example 1 (Polyimide 50 μm): 300 g weight Example 2 (Polyurethane 50 μm): 330 g weight Example 3 (Polyimide 70 μm): 100 g weight Example 4 (Polycarbonate 70 μm): 150 g weight After being bonded to the upper deburring roll, when left for 24 hours, peeling of the end from the roll was observed.

  In the measurement of wear resistance, a load test against friction was performed. That is, the deburring device 80 of Examples 1 to 4 was forced not to rotate the upper deburring roll provided with the band member, and a load of 55 kg was applied to the upper deburring roll. In this state, when the lower deburring roll is driven to rotate, the lower deburring roll rotates while sliding on one place of the belt member.

As a result, in Example 2 (polyurethane 50 μm), the base material of the band member was damaged after 60 minutes from the start of rotation of the lower deburring roll, and in Example 4 (polycarbonate 70 μm), the base material of the band member was damaged after 50 minutes. did. In Example 1 (polyimide 50 μm) and Example 3 (polyimide 70 μm), no damage was observed even after 12 hours from the start of rotation of the lower deburring roll.
[Impact propagation characteristics]
Next, the propagation characteristics of the impact from the apparatus main body 80A to the support frame F of the image forming apparatus 1 with and without the buffer member 88 were measured.

  In the image forming apparatus according to the first exemplary embodiment, sensors for detecting vibration are attached to both the frame 81 (see FIG. 4) of the deburring apparatus and the support frame F (see FIG. 16) of the deburring apparatus. An impact was applied to the frame 81 of the apparatus, and the ratio of the amplitude of vibration caused by the impact detected by both sensors was measured as the gain of the transfer function. The vibration ratio was also measured for a comparative example in which the rail member 89 was directly fixed to the fixing portion 87 without using the buffer member 88.

  FIG. 21 is a graph showing a ratio between the vibration of the frame of the deburring device and the vibration of the support frame of the image forming apparatus in the image forming apparatus of Example 1. FIG. 22 is a graph showing the ratio of the vibration of the frame of the apparatus main body and the vibration of the support frame of the image forming apparatus in the comparative example. The horizontal axis of the graphs of FIGS. 21 and 22 represents the frequency (component) of vibration, and the vertical axis represents the ratio (gain) of the vibration of the support frame of the image forming apparatus to the vibration of the frame of the apparatus main body.

  The vibration ratio (gain) in the image forming apparatus of Example 1 shown in the graph of FIG. 21 is smaller than the vibration ratio of the comparative example shown in the graph of FIG. 22 at any frequency shown in the graph. Further, the vibration ratio in Example 1 is smaller than 1 at any frequency shown in the graph. It was confirmed that by providing the buffer member 88, the propagation of impact from the deburring device main body to the support frame of the image forming apparatus was relaxed.

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

  In the above-described embodiment, the combination of the charger, the exposure device, and the developing device is shown as an example of the image forming unit. However, the image forming unit is not limited to this, and corresponds to, for example, an image on the image carrier. The toner may be directly attached aiming at the position.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10A, 10B, 10C, 10D, 10E, 10F Image forming part 20 Intermediate transfer belt 30 Secondary transfer device 40 Fixing device 80 Deburring device 80A Device main body 80B Support part 80C Motor unit 81 Frame 811 Rail 812 Protrusion 82A Upper deburring roll 82B Lower deburring roll 84, 85 Paper guide portion 86 Roll support mechanism 87 Fixing portion 88 Buffer member 89 Rail member 90 Control portion 825 Band member 843, 844, 853, 854 Extrusion member 861 Roll support arm 864 Cam 865 retract motor

Claims (2)

A first rotating body having a peripheral surface made of a nitridized stainless material, the peripheral surface moving around, and
A recording medium having a peripheral surface made of a nitridized stainless material, the peripheral surface reciprocally moves, and a recording medium on which an image is formed passes between the peripheral surface and the peripheral surface of the first rotating body. A second rotating body to perform,
A load applying unit that applies a load to at least one of the first peripheral body and the second peripheral body so as to sandwich the recording medium with the first peripheral body and the second peripheral body with the load; A medium holding device characterized by comprising: A first rotating body having a peripheral surface made of a nitridized stainless material, the peripheral surface moving around, and
A recording medium having a peripheral surface made of a nitridized stainless material, the peripheral surface reciprocally moves, and a recording medium on which an image is formed passes between the peripheral surface and the peripheral surface of the first rotating body. A second rotating body to perform,
A load applying unit that applies a load to at least one of the first peripheral body and the second peripheral body, and sandwiches the recording medium with the load by the first peripheral body and the second peripheral body; An image forming apparatus comprising: an image forming unit that forms an image on a surface of a recording medium that has passed between a peripheral surface of a first peripheral member and a peripheral surface of the second peripheral member.

Images