JP2011123200A - Recording medium peeling device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording medium peeling device which can adjust a position of a peeling member with sufficient degree of freedom relative to a moving surface, and can stably maintain the position after such adjustment, and to provide an image forming apparatus. <P>SOLUTION: A supporting base 460 supports a peeling baffle 450 by fixing the peeling baffle 450 at two fixed spots 463 and 464 spaced in a direction extending along the peeling baffle 450 being warped, and is positioned relative to a circulation path R3. The supporting base 460 has screw holes 465 and 466 between the two fixed spots 463 and 464, and the peeling baffle 450 is pressed in a direction in which the warpage of the peeling baffle 450 is straightened by a straightening screw 472 fitted in the screw holes 465 and 466. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a recording medium peeling apparatus and an image forming apparatus.

  In an electrophotographic image forming apparatus used for a copying machine, a printer, a facsimile, or the like, a recording medium is pressed against a moving surface for image transfer or fixing.

  Further, a recording sheet peeling apparatus that peels a recording medium (recording sheet) from a moving surface with a peeling member (peeling sheet) has been proposed (see, for example, Patent Document 1).

JP 2002-91221 A

  The present invention provides a recording medium peeling apparatus and an image forming apparatus that can adjust the position of the peeling member with sufficient degree of freedom relative to the moving surface, and can also stably maintain the adjusted position. It is for the purpose.

The recording medium peeling apparatus according to claim 1, which achieves the above object.
A circulation moving part having a moving surface that circulates along the circulation path;
A pressurizing unit that presses a recording medium passing through a pressurizing position existing in the middle of the circulation path to the moving surface at the pressurizing position;
The pressurization position, which is disposed downstream of the pressurization position and spaced from the moving surface, extends along the moving surface and intersects the direction of the cyclical movement. A peeling member provided with a warp that peels the recording medium that has passed through the moving surface;
The peeling member is fixed at a plurality of fixing points which are positioned with respect to the circulation path and extend along the peeling member and have higher rigidity than the peeling member and spaced in the extending direction. A supporting base that supports the peeling member and has a screw hole between the plurality of fixing points,
A straightening screw that fits into the screw hole of the support base and presses the peeling member in a direction to correct the warping of the peeling member;
It is provided with.

Here, the recording medium peeling apparatus according to claim 2 is:
“The moving surface is an outer peripheral surface of a belt-like member that circulates and moves along the circulation path, which is connected in a circular shape around the circulation path.
From the inner peripheral surface side of the belt-shaped member, which is arranged downstream of the pressurizing position and on the upstream side of the circulating movement with respect to the peeling member and extending in a direction crossing the direction of the circulating movement. The belt-shaped member is provided with a push-up member that pushes the recording medium away from the moving surface by pushing it up to the outer peripheral surface side.
It is characterized by that.

The recording medium peeling apparatus according to claim 3
“With a gap forming body that is arranged at the fixed location and creates a gap between the support base and the peeling member,
The peeling member is recessed toward the support base between the plurality of fixed locations due to the warpage,
The straightening screw pushes the peeling member in a direction protruding from the support base side. ''
It is characterized by that.

Moreover, the recording medium peeling apparatus according to claim 4 comprises:
"A fixing screw for screwing the peeling member to the fixing portion;
The width of the extending direction of the supporting base, which is disposed at the fixing location, creates a gap between the supporting base and the peeling member, is at least a part in contact with the supporting base than the width of the head of the fixing screw. With a narrow gap forming body,
The peeling member is recessed toward the support base between the plurality of fixed locations due to the warpage,
The straightening screw pushes the peeling member in a direction protruding from the support base side. ''
It is characterized by that.

  The recording medium peeling apparatus according to claim 5, wherein the support base is provided at a plurality of locations at a distance shorter than one third of a distance between the plurality of fixed locations from each of the plurality of fixed locations. The screw hole is open.

Moreover, the recording medium peeling apparatus according to claim 6 comprises:
“A fixing member having a fixed position relative to the circulation path is provided,
The support base is movable along a predetermined movement path and is positioned with respect to the circulation path by moving along the movement path and hitting the fixed member. ''
It is characterized by that.

Furthermore, the recording medium peeling apparatus according to claim 7 is:
“The circulating moving part has a heat source that generates heat, and the moving surface is heated by the heat source,
The recording medium has an unfixed toner image formed on the surface,
The pressure unit fixes the toner image on the surface of the recording medium by pressing the recording medium passing through the pressure position against the moving surface at the pressure position.
It is characterized by that.

The image forming apparatus according to claim 8, wherein the object is achieved.
An image forming unit that forms an image on the surface of the recording medium;
A circulation moving part having a moving surface that circulates along the circulation path;
A pressurizing unit that presses a recording medium passing through a pressurizing position existing in the middle of the circulation path to the moving surface at the pressurizing position;
The pressurization position, which is disposed downstream of the pressurization position and spaced from the moving surface, extends along the moving surface and intersects the direction of the cyclical movement. A peeling member provided with a warp that peels the recording medium that has passed through the moving surface;
The peeling member is fixed at a plurality of fixing points which are positioned with respect to the circulation path and extend along the peeling member and have higher rigidity than the peeling member and spaced in the extending direction. A supporting base that supports the peeling member and has a screw hole between the plurality of fixing points,
A straightening screw that fits into the screw hole of the support base and presses the peeling member in a direction to correct the warping of the peeling member;
It is provided with.

  According to the recording medium peeling apparatus according to claim 1 and the image forming apparatus according to claim 8, the position of the peeling member can be adjusted with a sufficient degree of freedom with respect to the moving surface, and the adjusted position can be stabilized. Can also be maintained.

  According to the recording medium peeling apparatus of the second aspect, the peelability of the recording medium is improved.

  According to the recording medium peeling apparatus of the third aspect, the mechanism for adjusting the position of the peeling member is simple.

  According to the recording medium peeling apparatus of the fourth aspect, even if the peeling member is screwed with the fixing screw, the margin for adjusting the position of the peeling member is secured.

  According to the recording medium peeling apparatus of the fifth aspect, the position can be adjusted even if the peeling member is not evenly warped.

  According to the recording medium peeling apparatus of the sixth aspect, the position can be adjusted before the peeling member is arranged on the moving surface.

  According to the recording medium peeling apparatus of the seventh aspect, the recording medium having the toner image fixed on the surface can be peeled off from the moving surface.

1 is a schematic configuration diagram showing an embodiment of an image forming apparatus of the present invention. 1 is a schematic configuration diagram illustrating a fixing device which is an embodiment of a recording medium peeling apparatus of the present invention. It is the perspective view which looked at the assembly which consists of the 1st heating roll, peeling pad, fixing member, peeling baffle, support base, and protrusion member which were shown in FIG. 2 from the front diagonally upward. It is the perspective view which looked at the assembly shown in Drawing 3 from the front slanting lower part. It is an expansion perspective view of the A section shown in FIG. It is an external view of a peeling baffle. It is the external view which looked at the peeling baffle shown in FIG. 6 from the side reinforced with the backing plate. It is the side view which looked at the A section shown in Drawing 4 in the state where the positioning projection of the support base was abutted against the fixing member. It is the side view which looked at the A section shown in FIG. 4 from the side surface in the state before the positioning protrusion of a support base is abutted on a fixing member. It is the perspective view which looked at what removed the peeling baffle from the assembly shown in FIG. 4 from the front diagonally downward. It is an expansion external view of the B section shown in FIG. It is an external view of the state which has arrange | positioned the peeling baffle in the fixed location of a support base. It is an external view of the state where the peeling baffle is screwed and fixed to the fixing portion of the support base. It is the perspective view which looked at the assembly which consists of a peeling baffle, a support base, and a protrusion member from the front diagonally upward. It is the perspective view which looked at the assembly shown in FIG. 14 from the front diagonally downward. It is the perspective view which looked at the assembly shown in FIG. 14 from the side. It is the perspective view which looked at both the assembly shown in FIG. 15 and the assembly which consists of a 1st heating roll, a peeling pad, and a fixing member from the front diagonally upward. It is the perspective view of the spacer seen from the side which touches a support base.

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

  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 that transfers the toner image from the intermediate transfer belt 20 onto a sheet. A fixing device 40 that fixes an unfixed toner image on the paper, a decurler 50 that corrects the winding of the paper, and a paper transport unit 60 that transports the paper along the transport path R1 and the front / back reversing path R2. The sheet storage devices 71 and 72 for storing sheets, a deburring device 80 for correcting burrs of sheets before image formation, and a posture correcting unit 73 for correcting the posture of the sheets are provided. 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. Here, the fixing device 40 corresponds to an example of the recording medium peeling apparatus of the present invention. A detailed description of the fixing device 40 will be described later.

  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 device 30 in this order. . Here, the combination of the image forming units 10A to 10F and the intermediate transfer belt 20 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 transporter 65 that transports the sheet from the secondary transfer unit 30 to the fixing unit 40, and from the fixing unit 40 to the cooling unit 74 while adsorbing the sheet to the outer peripheral surface of the belt 65a, and the sheet of the image forming apparatus 1. A discharge roll 66 that discharges to the outside, and a transport roll 68 that transports the paper disposed along the transport path R1 and the front / back reversing path R2 are provided. 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. Here, the belt conveyance device 65 that conveys the sheet from the fixing device 40 to the cooling unit 74 while adsorbing the sheet to the outer peripheral surface of the belt 65a corresponds to an example of a conveyance device that adsorbs and conveys the recording medium.

  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 arrow b. The image forming units 10A to 10F transfer the toner images of the respective colors to the intermediate transfer belt 20 in a superimposed manner. To go. 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 the toner image on the intermediate transfer belt 20 onto the paper by applying a transfer bias potential between the intermediate transfer belt 20 and the paper. The toner image is finally transferred onto the paper by the secondary transfer device 30. The sheet is further conveyed in the direction of the arrow d by the belt conveyer 65, and the unfixed toner image transferred onto the sheet is fixed by the fixing unit 40. In this way, an image composed of a fixed toner 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.

  Next, the fixing device 40 which is an embodiment of the recording medium peeling apparatus of the present invention will be described in detail.

  FIG. 2 is a schematic configuration diagram showing a fixing device 40 which is an embodiment of the recording medium peeling apparatus of the present invention. FIG. 3 is a perspective view of the assembly including the first heating roll 411, the peeling pad 430, the fixing member 440, the peeling baffle 450, the support base 460, and the protruding member 490 shown in FIG. FIG. 4 is a perspective view of the assembly shown in FIG. 3 as seen from obliquely below the front surface, and FIG. 5 is an enlarged perspective view of part A shown in FIG.

  As shown in FIG. 2, the fixing device 40 has a belt-like fixing belt having an outer peripheral surface as a moving surface that circulates in the direction of arrow e along the circulation path R <b> 3, which is circularly connected around the circulation path R <b> 3. 410 and a pressure roll 420 arranged to be pressed against the outer peripheral surface of the fixing belt 410 are provided.

  The fixing belt 410 is supported by a first heating roll 411, a second heating roll 412, a third heating roll 413, two stretching rolls 414 and 415, and a peeling pad 430, each having a heat source 401 that generates heat. Has been. The fixing belt 410 is an endless belt-shaped member made of a heat-resistant resin such as polyimide, for example. As shown in FIG. 2, the first heating roll 411, the peeling pad 430, the stretching roll 414, and the first heating roll 411, the third heating roll 413, the second heating roll 412, and the stretching roll 415 are circulated along a circulation path R3 passing in this order. Further, the fixing belt 410 is heated by a heat source 401 provided in each of the first heating roll 411, the second heating roll 412, and the third heating roll 413. The fixing belt 410 corresponds to an example of a circulation moving unit having a moving surface that circulates and moves along a circulation path, and each heat source 401 corresponds to an example of a heat source that heats the moving surface.

  The first heating roll 411 is a hard roll formed of, for example, aluminum or the like and having a cylindrical shape as shown in FIGS. Further, as shown in FIG. 2, the first heating roll 411 is a driving roll that is rotationally driven in the direction of arrow f around the axis of the cylinder while the fixing belt 410 is stretched. The first heating roll 411 is disposed in contact with the inner peripheral surface of the fixing belt 410 so as to face the pressure roll 420. That is, the fixing belt 410 is sandwiched between the first heating roll 411 and the pressure roll 420, and the pressure position is between the first heating roll 411 and the pressure roll 420.

  The second heating roll 412 is also a hard roll having a cylindrical shape formed of, for example, aluminum. Further, as shown in FIG. 2, the second heating roll 412 is a driven roll that rotates in the direction of the arrow g around the axis of the cylinder while the fixing belt 410 is stretched. The second heating roll 412 is disposed at a position separated from the first heating roll 411 in contact with the inner peripheral surface of the fixing belt 410. Although not shown in detail, the second heating roll 412 is provided so as to be able to swing in a direction intersecting the rotation axis direction, and controls the meandering of the fixing belt 410 by the swing. have.

  The third heating roll 413 is also a hard roll having a cylindrical shape formed of, for example, aluminum. Further, as shown in FIG. 2, the third heating roll 413 is a drive roll that is rotationally driven in the direction of arrow h around the axis of the cylinder. The third heating roll 413 is pressed against the outer peripheral surface of the fixing belt 410 at a position downstream of the first heating roll 411 in the circulation movement and upstream of the second heating roll 412 in the circulation movement. Has been deployed. Further, the rotation speed of the third heating roll 413 is slightly faster than the circulation movement speed of the fixing belt 410, whereby the fixing in the portion from the pressing position to the third heating roll 413 is performed. The slack of the belt 410 is removed.

  The peeling pad 430 is a member extending in a direction intersecting with the direction of circulation movement, which is formed into a plate shape with, for example, stainless steel and has a layer having a low friction coefficient and heat resistance on the surface. Further, as shown in FIG. 2, the peeling pad 430 is disposed on the inner peripheral surface of the fixing belt 410 at a position downstream of the circulating movement and upstream of the peeling baffle 450 to be described later. Deployed in contact. Since such a peeling pad 430 pushes up the fixing belt 410 from the inner peripheral surface side of the fixing belt 410 toward the outer peripheral surface side, a sharp bend is generated at the pushed-up portion of the fixing belt 410, so that the fixing of the sheet is performed. The peeling from the outer peripheral surface of the belt 410 is urged. The fixing belt 410 corresponds to an example of a belt-like member that is connected in an annular shape around the circulation path, and the peeling pad 430 corresponds to an example of a push-up member that pushes up the belt-like member. In addition, as shown in FIGS. 3 to 5, the peeling pad 430 is supported by a fixing member 440 whose position with respect to the circulation path R <b> 3 is fixed.

  The fixing member 440 is a member that is made of, for example, aluminum and extends along the peeling pad 430 and has higher rigidity than the peeling pad 430. In addition, the fixing member 440 is fixed to the rotating shaft of the first heating roll 411, so that the position with respect to the circulation path R3 is fixed. The fixing member 440 supports the peeling pad 430 by attaching the peeling pad 430. The fixing member 440 corresponds to an example of a fixing member whose position with respect to the circulation path is fixed.

  The pressure roll 420 is a soft roll having a cylindrical shape, which is formed of, for example, aluminum or the like and has an elastic layer 421 formed on the peripheral surface as shown in FIG. The pressure roll 420 is a roll that is pressed against the outer peripheral surface of the fixing belt 410 and rotates in the direction of arrow i around the axis of the cylinder. The pressure roll 420 sandwiches the fixing belt 410 with the first heating roll 411 disposed on the inner peripheral surface side of the fixing belt 410, and this position where the fixing belt 410 is sandwiched is the circulation path R3. It is a pressurizing position that exists on the way. The pressure roller 420 fixes the toner image on the surface of the paper by pressing the paper on which the unfixed toner image is formed on the outer surface of the fixing belt 410 at the pressure position. The pressure roll 420 corresponds to an example of a pressure unit that presses the recording medium against the moving surface.

  As shown in FIG. 2, the fixing device 40 includes a peeling baffle 450 disposed at a distance from the outer peripheral surface of the fixing belt 410 on the downstream side of the circulation movement from the pressing position, and a peeling baffle 450. A support base 460 for supporting the baffle 450 is also provided.

  6 is an external view of the peeling baffle 450, and FIG. 7 is an external view of the peeling baffle 450 shown in FIG. 6 as viewed from the side reinforced by the backing plate 451.

  The peeling baffle 450 is a member that is formed of, for example, stainless steel and has a surface having a low friction coefficient and heat resistance. As shown in FIGS. It is a member which has the plate shape extended in the direction which cross | intersects the outer peripheral surface of this and the direction of circulation movement. The peeling baffle 450 has a posture in which one long side 452 of the two plate-like long sides 452 and 453 extending in this manner is close to the outer peripheral surface of the fixing belt 410. As shown in FIGS. 6 and 7, the peeling baffle 450 is reinforced by a backing plate 451 formed of, for example, stainless steel as a reinforcing member from the side facing the support base 460. The peeling baffle 450 and the backing plate 451 are integrated by, for example, laser welding, and are warped after being integrated. And this peeling baffle 450 is dented by the side of the support base 460 between two fixed locations 463 and 464 mentioned later by curvature. However, this warpage is corrected on the support base 460 as will be described later. With such a peeling baffle 450, the paper that has passed the pressure position is peeled off from the outer peripheral surface of the fixing belt 410. The peeling baffle 450 corresponds to an example of a peeling member that peels the recording medium from the moving surface.

  As shown in FIGS. 4 and 5, the support base 460 is a member that is formed of, for example, aluminum and extends along the peeling baffle 450 and has higher rigidity than the peeling baffle 450. Here, as shown in FIG. 5, the support base 460 is a member having a structure in which plate plates 4602 are attached to both ends of the main body member 4601 by welding, and the upper left end of the main body member 4601 is bent. As a result, the torsional rigidity is increased.

  8 is a side view of the portion A shown in FIG. 4 viewed from the side in a state where the positioning protrusions 461 and 462 of the support base 460 are abutted against the fixing member 440, and FIG. 9 shows the positioning of the support base 460. FIG. 5 is a side view of the portion A shown in FIG.

  The support base 460 has positioning protrusions 461 and 462 at both ends in a direction intersecting with the direction of the circular movement, and is movable along a predetermined movement path. The support base 460 moves along the movement path and is positioned on the fixed member 440. The protrusions 461 and 462 are positioned with respect to the circulation path R3 by abutting. Here, as shown in FIG. 8 and FIG. 9, between the end of the support base 460 in the direction intersecting the direction of the circulation movement and the end of the fixing member 440 in the direction intersecting the direction of the circulation movement, A spring 470 is provided, and the support base 460 is biased by the spring 470 in a direction in which the positioning protrusions 461 and 462 of the support base 460 abut against the fixing member 440.

  10 is a perspective view of the assembly shown in FIG. 4 from which the peeling baffle 450 has been removed, as seen from the front obliquely below, and FIG. 11 is an enlarged external view of a portion B shown in FIG. 12 is an external view of the state in which the peeling baffle 450 is disposed at the fixing locations 463 and 464 of the support base 460. FIG. 13 is a diagram illustrating the fixing of the peeling baffle 450 to the fixing locations 463 and 464 of the support base 460. FIG. FIG. 14 is a perspective view of the assembly including the peeling baffle 450, the support base 460, and the protruding member 490 as seen from diagonally above the front surface. FIG. 15 is a perspective view of the assembly shown in FIG. 16 is a perspective view of the assembly shown in FIG. 14 as viewed from the side, and FIG. 17 is a view from the assembly shown in FIG. 15, the first heating roll 411, the peeling pad 430, and the fixing member 440. It is the perspective view which looked at both with the assembly which becomes from the front diagonally upward. FIG. 18 is a perspective view of the spacer 480 viewed from the side in contact with the support base 460.

  As shown in FIGS. 10 to 14, the support base 460 is peeled off by two fixing points 463 and 464 that are spaced apart in the direction extending along the peeling baffle 450 by a fixing screw 471 through a spacer 480. The peeling baffle 450 is supported by fixing the baffle 450 with screws. The support base 460 corresponds to an example of a support base that supports the peeling member, and also corresponds to an example of a support base of a type that is positioned by hitting the fixing member. As shown in FIG. 18, the spacer 480 is a member that creates a gap between the support base 460 and the peeling baffle 450, and the contact portion 481 that contacts the support base 460 has a fixed width in the direction in which the support base 460 extends. The screw 471 has a shape narrower than the width of the head. Further, as shown in FIG. 10, the support base 460 has two distances shorter than one third of the distance between the two fixing points 463 and 464 from the two fixing points 463 and 464, respectively. Screw holes 465 and 466 are vacant at the locations. 15 and 16, the screw holes 465 and 466 are fitted with straightening screws 472 that push the peeling baffle 450 in a direction in which the warping of the peeling baffle 450 is corrected, that is, a direction protruding from the support base 460 side. Yes. The spacer 480 corresponds to an example of a gap forming body that creates a gap between the support base and the peeling member, and the fixing screw 471 corresponds to an example of a fixing screw that screws the peeling member to a fixing portion. . The straightening screw 472 corresponds to an example of a straightening screw that pushes the peeling member in a direction to correct the warping of the peeling member.

  Here, the adjustment method of arrangement | positioning of the peeling baffle 450 is demonstrated.

  In the peeling baffle 450, one long side 452 is close to the outer peripheral surface of the fixing belt 410, and the distance between the one long side 452 and the outer peripheral surface of the fixing belt 410 and the warping amount of the peeling baffle 450 are set. By adjusting to be ideal, high peeling performance can be obtained, and damage due to contact with the outer peripheral surface of the fixing belt 410 can be prevented.

  The “long side 452 close to the outer peripheral surface of the fixing belt 410” is hereinafter appropriately referred to as “the edge of the peeling baffle 450”.

  In adjusting the distance between each edge portion of the peeling baffle 450 and the outer peripheral surface of the fixing belt 410, a jig having a reference surface corresponding to an ideal position of each edge portion with respect to the outer peripheral surface is used. In adjusting the arrangement of the peeling baffle 450, first, the support base 460 is removed from the fixing member 440. Next, using the positioning protrusions 461 and 462 of the support base 460, the jig is positioned and fixed to the support base 460. In the operation described below, the edge of the peeling baffle 450 is positioned with respect to the reference surface of the jig. This operation is performed at a position sufficiently away from the fixing belt 410 that is easily damaged.

  The peeling baffle 450 is screwed and fixed to the fixing points 463 and 464 of the support base 460 with the fixing screw 471 through the spacer 480 in a state where the edge hits the reference surface of the jig. Here, in the contact portion 481 of the spacer 480 that contacts the support base 460, the width in the direction in which the support base 460 extends is the width described above, and the peeling baffle 450 is firmly screwed to the support base 460 with the fixing screw 471. Even if fixed, the warping of the peeling baffle 450 remains to the extent necessary for edge position adjustment.

  After such fixing, the straightening screw 472 protrudes from the support base 460 side and presses, whereby the warping of the peeling baffle 450 is corrected so as to eliminate the gap with the reference surface of the jig. Such warpage correction is an adjustment having a sufficient degree of freedom, and the state corrected in this way is stably maintained by the warping force of the peeling baffle 450. In addition, although the curvature given to the peeling baffle 450 may be biased to one side of the two fixing points 463 and 464, such a correction is caused by the correction screw 472 that fits into the screw holes 465 and 466 that are vacant at the above-described points. Negligible warpage is also corrected.

  After the peeling baffle 450 is thus positioned with respect to the support base 460, the jig is removed from the support base 460. As a result, as shown in FIGS. 14 to 17, the peeling baffle 450 is supported by the support base 460.

  After supporting the peeling baffle 450, a support base 460 that supports the peeling baffle 450 is attached to the fixing member 440. At this time, the support base 460 is attracted to the fixing member 440 by the urging force of the spring 470, the positioning protrusions 461 and 462 of the support base 460 come into contact with the fixing member 440, and the support base 460 accurately returns to the original position. As a result, the peeling baffle 450 is accurately positioned with respect to the circulation path R3, and the position of the edge of the peeling baffle 450 is ideally close to the outer peripheral surface of the fixing belt 410, and high peeling performance is realized. .

  This is the end of the description of the method for adjusting the arrangement of the peeling baffle 450 and the description of the fixing device 40 is resumed.

  As shown in FIG. 2, the fixing device 40 is also provided with a protruding member 490 attached to the support base 460.

  The protruding member 490 is a member made of a heat-resistant resin such as polyimide, and has a plate shape as shown in FIGS. 2 to 5, 8 to 15, and 17. As shown in FIG. 2, the protruding member 490 is disposed downstream of the peeling baffle 450 in the direction in which the paper peeled by the peeling baffle 450 travels. The protruding member 490 protrudes from the peeling baffle 450 side to the paper side, and is inclined toward the downstream side in the direction in which the paper peeled off by the peeling baffle 450 travels. The protruding member 490 corresponds to an example of a protruding member that protrudes from the peeling member side to the recording medium side.

  Next, the basic operation before and after fixing by the fixing device 40 configured as described above and the basic operation of fixing by the fixing device 40 will be described.

  As shown in FIG. 1, the sheet on which the toner image is transferred onto the surface by the secondary transfer unit 30 is conveyed toward the fixing unit 40 by the belt conveyance unit 65 and is sent to the fixing unit 40.

  When a sheet with an unfixed toner image formed on the surface is fed into the fixing device 40 and passes through the pressure position of the fixing device 40, as shown in FIG. 2, the first heating roll 411 and the second heating roll 412. The toner constituting the unfixed toner image on the paper surface is melted by the fixing belt 410 heated by the heat source 401 provided on each of the third heating rolls 413. Then, at the pressure position, the sheet is pressed against the outer peripheral surface of the fixing belt 410 by the pressure roll 420, whereby the toner image is fixed on the surface of the sheet. In this way, an image composed of a fixed toner image is formed on the paper.

  The paper on which the image has been formed and has passed through the pressure position is urged to peel from the outer peripheral surface of the fixing belt 410 by the peeling pad 430 that pushes the fixing belt 410 from the inner peripheral surface side to the outer peripheral surface side. When the peeling is insufficient, the peeling is performed from the outer circumferential surface of the fixing belt 410 by the peeling baffle 450 along the outer circumferential surface of the fixing belt 410. The sheet peeled from the outer peripheral surface of the fixing belt 410 is transported toward the cooling unit 74 by the belt transporter 65.

  Here, as described above, at the rear end of the support base 460 that supports the peeling baffle 450, that is, at the downstream end in the direction in which the paper peeled by the peeling baffle 450 travels, the protruding member made of a heat-resistant resin plate 490 is pasted. As shown in FIG. 2, the protrusion member 490 protrudes from the peeling baffle 450 side to the paper side and is inclined to the downstream side in the direction in which the paper peeled by the peeling baffle 450 advances. Further, as shown in FIG. 2, the belt conveyer 65 that conveys from the fixing device 40 to the cooling unit 74 is disposed downstream of the peeling baffle 450 in the direction in which the sheet peeled by the peeling baffle 450 travels. . Then, as described above, the belt transporter 65 transports the sheet while adsorbing the sheet to the outer peripheral surface of the belt 65a. The sheet peeled off from the outer peripheral surface of the fixing belt 410 is caused by factors such as the type of the sheet, the adhesion force of the toner to the fixing belt 410, the repulsive force of the pressure roll 420, and the electrostatic adhesion force to the separation baffle 450. In this case, if the protruding member 490 is not present, the paper is separated from the original conveyance path, and the paper is jammed. The so-called paper jam that occurs may occur. In the image forming apparatus 1 of the present embodiment, the sheet peeled from the outer peripheral surface of the fixing belt 410 is guided by the protruding member 490 so as to be separated from the peeling baffle 450 and is attracted to the belt transporter 65. As a result, the occurrence of paper jam is suppressed, and the paper is reliably guided downstream in the direction in which the paper travels.

  In the above-described embodiment, the example in which the image forming apparatus of the present invention is a tandem type color printer has been described. However, the image forming apparatus of the present invention is not limited to this, and the image forming unit and recording are performed. Any image forming apparatus may be used as long as the image forming apparatus includes a medium peeling device.

  In the above-described embodiment, the example in which the recording medium peeling device according to the present invention is a fixing device has been described. However, the recording medium peeling device according to the present invention is not limited to this, and for example, a transfer device or the like. Any recording medium may be used as long as it allows the recording medium that has passed through the pressing position to be peeled off from the moving surface.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10A, 10B, 10C, 10D, 10E, 10F Image forming part 11 Photoconductor 12 Charging device 13 Exposure device 14 Developer 15 Primary transfer device 18A, 18B, 18C, 18D, 18E, 18F Toner cartridge 20 Intermediate transfer Belt 21, 22, 23 Belt support roll 30 Secondary transfer device 40 Fixing device 401 Heat source 410 Fixing belt 411 First heating roll 412 Second heating roll 413 Third heating roll 414, 415 Stretching roll 420 Pressure roll 421 Elastic layer 430 Peeling pad 440 Fixing member 450 Peeling baffle 451 Backing plate 452,453 Long side 460 Support base 4601 Body member 4602 Plate plate 461,462 Positioning protrusion 463,464 Fixing location 465,466 Screw hole 470 Spring 471 Fixation 472 Straightening screw 480 Spacer 481 Contact portion 490 Extruding member 50 Decaler 60 Paper transport unit 61, 62 Take-out roll 64 Registration roll 65 Belt transporter 65a Belt 66 Discharge roll 68 Transport roll 69 Discharged paper storage unit 71, 72 Paper storage unit 73 Posture Correction Unit 74 Cooling Unit 80 Deburring Device 90 Control Unit

Claims (8)

A circulation moving part having a moving surface that circulates along the circulation path;
A pressurizing unit that presses a recording medium that passes through a pressurizing position existing in the middle of the circulation path to the moving surface at the pressurizing position;
The pressurization position, which is disposed downstream of the pressurization position and spaced from the moving surface, extends along the moving surface and intersects the direction of the circular movement. A peeling member provided with a warp that peels the recording medium that has passed through the moving surface;
The peeling member is fixed at a plurality of fixing points which are positioned with respect to the circulation path and which extend along the peeling member and have higher rigidity than the peeling member and spaced in the extending direction. A supporting base having a screw hole between the plurality of fixing points, which supports the peeling member.
A straightening screw that fits into the screw hole of the support base and presses the peeling member in a direction to correct warping of the peeling member;
A recording medium peeling apparatus comprising: The moving surface is an outer peripheral surface of a belt-like member that circulates and moves along the circulation path, which is connected in an annular shape around the circulation path.
From the inner peripheral surface side of the belt-shaped member, which is disposed downstream of the pressurization position and downstream of the separation member and upstream of the separation member and extending in a direction crossing the direction of the circulation member. 2. The recording medium peeling apparatus according to claim 1, further comprising a push-up member that promotes peeling of the recording medium from the moving surface by pushing up the belt-shaped member toward the outer peripheral surface. Provided with a gap forming body that is provided at the fixed location and creates a gap between the support base and the peeling member;
The peeling member is recessed toward the support base between the plurality of fixed locations due to the warpage,
3. The recording medium peeling apparatus according to claim 1, wherein the straightening screw pushes the peeling member in a direction protruding from the support base side. A fixing screw for screwing the peeling member to the fixing portion;
The width of the extending direction of the supporting base, which is provided at the fixing location and creates a gap between the supporting base and the peeling member, is at least a portion in contact with the supporting base than the width of the head of the fixing screw. With a narrow gap forming body,
The peeling member is recessed toward the support base between the plurality of fixed locations due to the warpage,
The recording medium peeling apparatus according to claim 1, wherein the straightening screw pushes the peeling member in a direction protruding from the support base side.   The supporting base is characterized in that the screw holes are formed at a plurality of locations at a distance shorter than one third of the distance between the plurality of fixed locations from each of the plurality of fixed locations. The recording medium peeling apparatus according to any one of claims 1 to 4. A fixing member having a fixed position relative to the circulation path;
2. The support base is movable along a predetermined movement path, and is positioned with respect to the circulation path by moving along the movement path and hitting the fixed member. 6. The recording medium peeling apparatus according to any one of 5 to 5. The circulating moving part has a heat source that generates heat, and the moving surface is heated by the heat source,
The recording medium has an unfixed toner image formed on the surface,
The pressurizing unit is configured to fix the toner image on the surface of the recording medium by pressing a recording medium passing through the pressing position against the moving surface at the pressing position. Item 7. The recording medium peeling apparatus according to any one of Items 1 to 6. An image forming unit that forms an image on the surface of the recording medium;
A circulation moving part having a moving surface that circulates along the circulation path;
A pressurizing unit that presses a recording medium that passes through a pressurizing position existing in the middle of the circulation path to the moving surface at the pressurizing position;
The pressurization position, which is disposed downstream of the pressurization position and spaced from the moving surface, extends along the moving surface and intersects the direction of the circular movement. A peeling member provided with a warp that peels the recording medium that has passed through the moving surface;
The peeling member is fixed at a plurality of fixing points which are positioned with respect to the circulation path and which extend along the peeling member and have higher rigidity than the peeling member and spaced in the extending direction. A supporting base having a screw hole between the plurality of fixing points, which supports the peeling member.
A straightening screw that fits into the screw hole of the support base and presses the peeling member in a direction to correct warping of the peeling member;
An image forming apparatus comprising:

Images