JP2015108656A - Fixing device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device that can prevent a fixing roller from being partially worn by a thermistor.SOLUTION: A fixing device 12 includes a fixing roller 31 that rotates to convey sheets, a pressure roller 32 that is in pressure contact with the fixing roller 31 to apply pressure to the sheets, a thermistor 60 that detects the temperature of the peripheral surface of the fixing roller 31, a cleaning member (take-up roller 343) that is rotationally driven to clean the peripheral surface of the fixing roller, and a transmission mechanism (contact member 70 and end face cam 80) that transmits the driving force to rotationally drive the cleaning member to move the contact position of the thermistor 60 to the fixing roller 31.

Description

  The present invention relates to a fixing device and an image forming apparatus for fixing a toner image formed on a sheet.

  2. Description of the Related Art Conventionally, some image forming apparatuses such as copying machines, printers, and facsimile machines are configured to form images using electrophotographic technology. In such an image forming apparatus, when an image is formed on a sheet, a toner image is formed on the image carrier, and then the toner image is fixed on the sheet.

  Here, as a method for fixing the toner image on the paper, it is most useful to apply heat so as to melt the powdered toner by applying heat so as to press the toner and the paper. For this reason, an image forming apparatus using an electrophotographic method generally includes a fixing device having a fixing roller and a pressure roller as means for fixing a toner image on a sheet. When fixing the toner image, the sheet on which the toner image has been transferred enters the nip formed by the fixing roller and the pressure roller to heat and press the toner image.

  By the way, in the above-described thermal fixing type fixing device, it is important to maintain the fixing temperature at a predetermined temperature. A thermistor is disposed in contact with the surface of the fixing roller, and the fixing temperature is set based on the detected temperature. I have control. However, the provision of the thermistor in contact with the surface of the fixing roller has a problem that the contact portion of the fixing roller is locally worn. Therefore, a fixing device that slows down the rotation speed of the fixing roller to prevent the contact portion from being worn when the paper is not passed is proposed (see, for example, Patent Document 1).

JP-A-9-190105

  However, in the fixing device described in Patent Document 1, since the thermistor is always in contact with the same part of the fixing roller, even if the rotation speed of the fixing roller is controlled, local wear can be prevented if the operation time becomes long. I can't.

  The present invention has been made to solve the above-described problems, and a fixing device and an image forming apparatus that can prevent the fixing roller from being partially worn by the thermistor and extend the life of the fixing roller. An object is to provide an apparatus.

  A fixing device according to the present invention includes a rotating member that rotates and conveys a sheet, and a pressing member that presses the sheet while being pressed against the rotating member, and the rotating member and the pressing member serve as the sheet. A fixing device for fixing the toner image formed on the paper by sandwiching the temperature of the rotating member, and a temperature detecting member for detecting the temperature of the peripheral surface of the rotating member; And a transmission mechanism for transmitting a driving force for rotationally driving the cleaning member and for moving a contact position of the temperature detection member with respect to the rotational member.

  In the fixing device according to the present invention, the temperature detecting member may reciprocate in the axial direction of the rotating member.

  In the fixing device according to the present invention, the temperature detection member is provided with a detection surface that is in contact with the circumferential surface of the rotating member, and the detection surfaces are arranged at both ends in the axial direction of the rotating member toward the end portion. It is good also as a structure provided with the inclination part inclined in the direction away from the surrounding surface of a rotating member.

  The fixing device according to the present invention may be configured to include a plurality of the temperature detection members, and the temperature detection members may be provided at positions facing the center and the end in the axial direction of the rotation member. Good.

  In the fixing device according to the present invention, the transmission mechanism may include an end face cam that is rotated by a driving force of the cleaning member and a contact member that reciprocates the temperature detection member in conjunction with the end face cam. Good.

  The fixing device according to the present invention may include a peeling member that peels off the paper conveyed by the rotating member, and the transmission mechanism may move a contact position of the peeling member with respect to the rotating member.

  In the fixing device according to the present invention, the temperature detection member and the peeling member may be provided at positions separated from each other in the axial direction of the rotating member.

  The fixing device according to the present invention may be configured to include a plurality of the transmission mechanisms, and the temperature detection member and the peeling member may be configured to move in conjunction with the corresponding transmission mechanisms.

  An image forming apparatus according to the present invention includes the fixing device according to the present invention.

  According to the present invention, it is possible to prevent the rotating member from being partially worn by the temperature detection member, thereby extending the life of the rotating member. Further, by using the driving force of the cleaning member, it is possible to simplify the configuration without the drive source for moving the temperature detection member, and it is possible to move the temperature detection member periodically in accordance with the cleaning timing. .

1 is a schematic side view of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a side sectional view schematically showing the fixing device according to the first embodiment. FIG. 3 is a plan view illustrating a configuration example of a fixing device according to the first embodiment. It is sectional drawing in the arrow EE in FIG. 3A. FIG. 3 is a perspective view illustrating a configuration example of a fixing device according to the first embodiment. FIG. 5 is an enlarged perspective view in which an end portion of the fixing device shown in FIG. 4 is enlarged. FIG. 3 is a side view illustrating a configuration example of a fixing device according to the first embodiment. It is an external appearance perspective view which shows the structural example of an end surface cam. It is an external appearance side view which shows the structural example of an end surface cam. It is a top view which shows the structural example of a contact member. It is a perspective view which shows the structural example of a thermistor. It is a perspective view which shows the structural example of the thermistor of the fixing device which concerns on 2nd Embodiment. FIG. 9 is a plan view illustrating a configuration example of a contact member of a fixing device according to a third embodiment. FIG. 10 is a side view illustrating a configuration example of a fixing device according to a fourth embodiment. It is a schematic sectional drawing which shows the structural example of the fixing device which concerns on 4th Embodiment.

  Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side view of an image forming apparatus according to an embodiment of the present invention.

  The image forming apparatus 1 has a copying function of reading a document and forming an image on a sheet. The image reading device C, a document conveying device (ADF) B provided on the upper side of the image reading device C, and the image reading device C. The image forming unit A, the paper feed cassette 10, and the stacking tray 15 are provided on the lower side.

  The document conveying device B is supported so as to be openable and closable with respect to the image reading device C. When the document conveying device B is opened, the upper part of the image reading device C is opened so that the document can be placed manually. The document conveying device B automatically conveys the placed document on the image reading device C. The image reading device C reads the placed document or the document conveyed from the document conveying device B and generates image data.

  In the image forming apparatus 1, image data corresponding to a color image using each color of black (K), cyan (C), magenta (M), and yellow (Y) or a monochrome image using a single color (for example, black). Are treated. The image forming unit A is provided with four developing devices 2, a photosensitive drum 3, a drum cleaning device 4 and four chargers 5 for forming four types of toner images, each of which includes black, cyan, magenta, And four image stations Pa, Pb, Pc, and Pd, which are associated with yellow and yellow.

  The drum cleaning device 4 removes and collects residual toner on the surface of the photosensitive drum 3. The charger 5 uniformly charges the surface of the photosensitive drum 3 to a predetermined potential. The optical scanning device 6 exposes the surface of the photosensitive drum 3 to form an electrostatic latent image. The developing device 2 develops the electrostatic latent image on the surface of the photosensitive drum 3 to form a toner image on the surface of the photosensitive drum 3. Through the above-described series of operations, a toner image of each color is formed on the surface of each photosensitive drum 3.

  An intermediate transfer belt 7 is disposed above the photosensitive drum 3. The intermediate transfer belt 7 circulates in the direction of arrow D, the residual toner is removed and collected by the belt cleaning device 9, and the toner images of the respective colors formed on the surfaces of the photosensitive drums 3 are sequentially transferred and superimposed. Thus, a color toner image is formed on the surface of the intermediate transfer belt 7.

  A nip area is formed between the transfer roller 11a of the secondary transfer device 11 and the intermediate transfer belt 7, and the sheet conveyed through the sheet conveyance path S is sandwiched and conveyed in the nip area. When the sheet passes through the nip area, the toner image on the surface of the intermediate transfer belt 7 is transferred and conveyed to the fixing device 12.

  The fixing device 12 includes a fixing roller 31 and a pressure roller 32 that rotate with a sheet interposed therebetween. The fixing device 12 sandwiches a sheet with a toner image transferred between the fixing roller 31 and the pressure roller 32 and heats and presses the sheet to fix the toner image on the sheet. The fixing device 12 will be described in detail with reference to FIG.

  The paper feed cassette 10 is a tray for accumulating sheets used for image formation, and is provided below the optical scanning device 6. The paper is pulled out from the paper feed cassette 10 by the pickup roller 16, transported through the paper transport path S, and transported to the stacking tray 15 through the secondary transfer device 11 and the fixing device 12 through the paper discharge roller 17. Is done. In the paper transport path S, after the paper is temporarily stopped and the leading edges of the paper are aligned, the paper is fed in accordance with the transfer timing of the color toner image in the nip area between the intermediate transfer belt 7 and the transfer roller 11a. A registration roller 14 that starts conveyance, a pre-registration roller 19, a conveyance roller 13 that prompts conveyance of the paper, and a paper discharge roller 17 are arranged.

  Further, when image formation is performed not only on the front side but also on the back side of the paper, the paper is conveyed in the reverse direction from the paper discharge roller 17 to the reverse path Sr, so that the front and back of the paper are reversed and the paper is transferred to the registration roller 14. Then, the image is formed on the back surface in the same manner as the front surface, and the paper is carried out to the stacking tray 15.

  FIG. 2 is a side sectional view schematically showing the fixing device according to the first embodiment.

  The fixing device 12 according to the embodiment of the present invention includes a fixing roller 31 and a pressure roller 32 in a state where the fixing roller 31 (an example of a rotating member) and a pressure roller 32 (an example of a pressure member) are in pressure contact with each other. A fixing nip area N1 is formed between which the sheet is sandwiched. The fixing roller 31 is formed in a hollow cylindrical shape and is heated by a heat source such as a halogen heater lamp provided therein. The pressure roller 32 is in pressure contact with the side surface (right side in the figure) of the fixing roller 31. Then, the fixing roller 31 is driven to rotate in a direction indicated by an arrow in the drawing to convey the paper while the pressure roller 32 is driven to rotate. When the sheet passes through the fixing nip area N1, the toner image is thermally fixed by being heated and pressurized.

  Further, the fixing device 12 includes a thermistor 60 (an example of a temperature detection member) that detects the temperature of the peripheral surface of the fixing roller 31 and a peeling claw 33 (a peeling member of the peeling member) that peels off the paper stuck to the peripheral surface of the fixing roller 31 Example). The thermistor 60 and the peeling claw 33 are disposed downstream of the fixing nip region N1 in the rotation direction of the fixing roller 31. Specifically, the thermistor 60 and the peeling claw 33 are supported by a contact member 70 that is swingably provided in the vicinity (upper side in the drawing) of the fixing roller 31, so that the tip contacts the fixing roller 31. Has been placed. The peeling claw 33 is urged toward the fixing roller 31 by an elastic member (not shown) such as a spring, and the claw at the tip is pressed against the peripheral surface of the fixing roller 31 with a weak force. The thermistor 60 will be described in detail with reference to FIG. 10 described later, and the contact member 70 will be described in detail with reference to FIG. 9 described later.

  Further, the fixing device 12 includes a cleaning member 34 that wipes the peripheral surface of the fixing roller 31. The cleaning member 34 includes a web sheet 341, a delivery roller 342, a take-up roller 343, a pressure contact roller 344, and a rotation drive unit 345.

  The web sheet 341 is formed using a thin cloth containing oil, and one end is wound around the feed roller 342 and the other end is wound around the take-up roller 343. The take-up roller 343 is driven to rotate by the driving force of the rotation drive unit 345 and takes up the web sheet 341 wound around the feed roller 342. The pressure roller 344 presses the web sheet 341 stretched between the feed roller 342 and the take-up roller 343 to the side surface (left side in the drawing) of the fixing roller 31. Accordingly, the web sheet 341 is pressed against the peripheral surface on the side surface of the fixing roller 31 and wipes and removes residual toner attached to the peripheral surface of the fixing roller 31.

  As described above, the web sheet 341 is pressed against the fixing roller 31 by the pressing roller 344 in the wiping nip region N2 between the pressing roller 344 and the fixing roller 31. When the web sheet 341 in the wiping nip area N2 is contaminated with the residual toner wiped off, and it becomes difficult to remove further residual toner, the rotation driving unit 345 rotates the take-up roller 343 by a certain amount to rotate the web sheet 341 by a certain amount. Send it out. As a result, the web sheet 341 in the wiping nip area N2 is renewed, and the residual toner can be removed.

  The fixing device 12 includes a transmission mechanism that transmits a driving force that rotationally drives the cleaning member 34, and is configured to move the contact position of the thermistor 60 against the fixing roller 31 by the transmitted driving force. Therefore, the fixing roller 31 can be prevented from being partially worn by the thermistor 60, and the life of the fixing roller 31 can be extended. Further, by using the driving force of the cleaning member 34, it is possible to simplify the configuration without the drive source for moving the thermistor 60, and it is possible to move the thermistor 60 periodically according to the cleaning timing.

  Below, the specific example of the transmission mechanism which moves the thermistor 60 is demonstrated in detail with reference to drawings.

  3A is a plan view illustrating a configuration example of the fixing device according to the first embodiment, FIG. 3B is a cross-sectional view taken along arrows EE in FIG. 3A, and FIG. 4 illustrates the first embodiment. FIG. 5 is a perspective view showing an example of the configuration of the fixing device, FIG. 5 is an enlarged perspective view of an end portion of the fixing device shown in FIG. 4, and FIG. 6 is a configuration example of the fixing device according to the first embodiment. FIG. 4 to 6 omit some components such as various covers so that the relationship between the various components included in the fixing device can be easily grasped.

  The fixing device 12 is formed in a polygonal column shape, and includes a fixing roller 31, a pressure roller 32, a thermistor 60, a peeling claw 33, a cleaning member 34, and the like. Each roller has a shaft arranged parallel to the axial direction Z.

  The contact member 70 has a contact portion 71 at one end (lower side in FIG. 3A), and is disposed in the vicinity of the fixing roller 31 with the longitudinal direction parallel to the axial direction Z. The contact member 70 is biased to one end side by a compression spring 72, and the contact portion 71 is in contact with the end surface of the end surface cam 80. The abutting member 70 is slidably screwed to the support plate 73 of the fixing device 12 by a stepped screw 75. The end face cam 80 is a gear whose teeth are engraved on the circumferential surface, and the rotation shaft is arranged in parallel with the axial direction Z. The end face cam 80 will be described in detail with reference to FIGS. 7 and 8 described later.

  As shown in FIGS. 4 to 6, a take-up roller driving gear 91 is attached to one end of the take-up roller 343. A first intermediate gear 92 meshes with the take-up roller drive gear 91. The first intermediate gear 92 is a two-stage gear, and has a second intermediate gear 93 having a different radius on the same rotation shaft. The second intermediate gear 93 meshes with the third intermediate gear 94, and the third intermediate gear 94 meshes with the end face cam 80. Accordingly, the driving force for rotating the take-up roller 343 (cleaning member 34) is transmitted to the end face cam 80 via the first intermediate gear 92, the second intermediate gear 93, and the third intermediate gear 94. Rotate.

  FIG. 7 is an external perspective view showing a configuration example of the end face cam, and FIG. 8 is an external side view showing a configuration example of the end face cam.

  The end face cam 80 includes a gear portion 81 formed in a cylindrical shape, and a cam portion 82 that protrudes along the periphery of the gear portion 81 in the rotation axis direction. The cam portion 82 is formed with a cam surface 83 whose height changes along the periphery. As shown in FIG. 3A, the contact portion 71 of the contact member 70 contacts the cam surface 83. That is, since the displacement is provided in the height of the cam portion 82, the displacement in the circumferential direction is transmitted to the contact member 70 as the end face cam 80 rotates, and the contact member 70 is moved in the longitudinal direction ( Reciprocate in the axial direction Z).

  FIG. 9 is a plan view illustrating a configuration example of the contact member.

  The contact member 70 is formed in a long plate shape, and a contact portion 71 is provided on the end face cam 80 side in the longitudinal direction. The contact member 70 has a peeling claw 33 attached along one long side, and a thermistor 60 attached along the other long side. In the present embodiment, the two thermistors 60 are provided, and the thermistors 60 are provided at positions facing the center and the end of the fixing roller 31 in the axial direction Z, respectively. That is, the temperature distribution can be grasped by detecting the temperatures at the center and the end of the fixing roller 31 that are different in frequency of contact with the paper, so that appropriate temperature control can be performed. Further, six peeling claws 33 are arranged along the axial direction Z so as to be separated from each other. Further, the thermistor 60 and the peeling claw 33 are provided at positions separated from each other in the axial direction Z. That is, the life of the fixing roller 31 can be extended by dispersing the portion of the peripheral surface of the fixing roller 31 that contacts the thermistor 60 and the peeling claw 33.

  The contact member 70 has screw holes 74 formed in the vicinity of both ends in the longitudinal direction, and the above-described stepped screw 75 is inserted into the screw hole 74. The screw hole 74 is formed in an oval shape extending in the longitudinal direction of the abutting member 70, and the abutting member 70 is supported by the support plate 73 in a state where it can reciprocate in the longitudinal direction.

  FIG. 10 is a perspective view showing a configuration example of the thermistor.

  The thermistor 60 (planar thermistor 60 </ b> A) includes an attachment portion 61 attached to the contact member 70 and a frame 63 extending from the attachment portion 61. The frame 63 is formed in a flat plate shape and is provided with a thermistor element for detecting temperature, and is covered with a protective tape formed of polytetrafluoroethylene, polyimide tape or the like for protecting the surface. A detection surface 62 provided on the frame 63 contacts the fixing roller 31. The detection surface 62 has a width in the axial direction Z of about 4 mm. In the present embodiment, the range of movement of the thermistor 60 is about 4 mm, and the thermistor 60 is moved as much as the width of the thermistor 60 contacting the fixing roller 31 in the axial direction Z.

  As described above, the driving force for rotationally driving the cleaning member 34 is transmitted to the end face cam 80 by a mechanism constituted by a plurality of cams. Therefore, when the take-up roller 343 rotates, the end face cam 80 rotates. To do. The abutting member 70 (abutting portion 71) is abutted against the cam portion 82 of the end face cam 80, and the abutting member 70 reciprocates in conjunction with the rotational movement of the end face cam 80. Do.

  In the present embodiment, the transmission mechanism includes an end face cam 80 that is rotated by the driving force of the cleaning member 34 and an abutting member 70 that reciprocates the thermistor 60 in conjunction with the end face cam 80. That is, the thermistor 60 can be reciprocated without providing a control circuit that tends to be expensive due to the transmission mechanism that operates with the driving force of the cleaning member 34. In addition, although it was set as the structure provided with the winding roller drive gear 91, the 1st intermediate gear 92, the 2nd intermediate gear 93, and the 3rd intermediate gear 94 as a member which transmits the drive force of the cleaning member 34, it is limited to this. Alternatively, other members such as a belt may be used. Furthermore, the transmission path of the driving force can be designed as appropriate, and is not limited to the present embodiment. For example, the driving force of the cleaning member 34 may be transmitted directly to the end face cam 80.

  As described above, the thermistor 60 is configured to reciprocate in the axial direction Z. Accordingly, since the moving range of the thermistor 60 is orthogonal to the conveying direction of the peripheral surface of the fixing roller 31, the area in contact with the thermistor 60 can be widened, and partial wear can be reliably prevented. it can.

  As described above, the fixing device 12 includes the separation claw 33 that separates the sheet conveyed by the fixing roller 31, and the transmission mechanism moves the contact position of the separation claw 33 with respect to the fixing roller 31. Accordingly, it is possible to prevent the fixing roller 31 from being worn by the peeling claw 33. That is, the peeling claw 33 is also in contact with the fixing roller 31 similarly to the thermistor 60 and can be prevented from being damaged by being moved by the transmission mechanism. In this embodiment, the peeling claw 33 is provided. However, the present invention is not limited to this. Instead of the peeling claw 33, a configuration in which a peeling plate whose position with respect to the fixing roller 31 is fixed may be provided. In this case, the peeling plate is disposed slightly apart from the fixing roller 31 and does not need to be attached to the contact member 70 and reciprocated.

  In the present embodiment, the fixing roller 31 is described as the rotating member. However, the fixing roller 31 is not limited thereto, and a fixing belt stretched around a plurality of rollers may be used as the rotating member. In this case, the pressure roller 32 may be brought into pressure contact with the fixing roller 31 via the fixing belt, and the thermistor 60 and the cleaning member 34 may be in contact with the peripheral surface of the fixing belt.

  Next, a second embodiment in which the thermistor 60 has a different shape will be described with reference to the drawings.

  FIG. 11 is a perspective view illustrating a configuration example of the thermistor of the fixing device according to the second embodiment. In addition, about the component which a function is substantially equal to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the first embodiment, the detection surface 62 of the thermistor 60 (planar thermistor 60A) is formed in a flat shape, whereas in the second embodiment, the detection surface 62 of the thermistor 60 (inclined thermistor 60B) has a different shape. It is said that. Specifically, in the inclined thermistor 60 </ b> B, the detection surfaces 62 are provided with inclined portions 62 a that are inclined in a direction away from the peripheral surface of the fixing roller 31 toward both ends in the axial direction Z. Therefore, by providing the inclined portion 62a, it is possible to prevent the thermistor 60 from being caught when sliding. In addition, although the inclined part 62a was made into the planar shape inclined with respect to the detection surface 62, it is not limited to this, For example, it is good also as a curved curved surface shape. Since other configurations are the same as those in the first embodiment, the first embodiment will be referred to and description thereof will be omitted.

  Next, a third embodiment in which the attachment position of the thermistor 60 is changed will be described with reference to the drawings.

  FIG. 12 is a plan view illustrating a configuration example of the contact member of the fixing device according to the third embodiment. In addition, about the component which a function is substantially equal to 1st Embodiment and 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the third embodiment, as shown in the drawing, the thermistor 60 and the peeling claw 33 are attached along the same long side of the contact member 70. That is, in 1st Embodiment, it was set as the structure provided with the six peeling claws 33, However In 3rd Embodiment, it is set as the structure provided with the 4 peeling claws 33, and it replaces with the two peeling claws 33, and the thermistor 60 is used. It is attached. Similarly to the first embodiment, the two thermistors 60 are respectively provided at positions facing the center and the end of the fixing roller 31 in the axial direction Z. When the thermistor 60 and the peeling claw 33 are both attached to the abutting member 70, the thermistor 60 and the peeling claw 33 are provided along the same long side of the abutting member 70, so that the shape of the other long side is obtained. Need to be taken into consideration, and the degree of freedom in design can be improved. Since other configurations are the same as those in the first embodiment, the first embodiment will be referred to and description thereof will be omitted.

  Next, 4th Embodiment provided with a some transmission mechanism is described with reference to drawings.

  FIG. 13 is a side view illustrating a configuration example of the fixing device according to the fourth embodiment, and FIG. 14 is a schematic cross-sectional view illustrating a configuration example of the fixing device according to the fourth embodiment. In addition, about the component which a function is substantially equal to 1st Embodiment thru | or 3rd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In 4th Embodiment, it is set as the structure provided with a some transmission mechanism, 70 A of 1st contact members to which the thermistor 60 was attached, 2nd contact member 70B to which the peeling nail | claw 33 was attached, 1st contact member A first end face cam 80A for moving 70A and a second end face cam 80B for moving the second contact member 70B are provided. Specifically, the first end face cam 80A meshes with the third intermediate gear 94 at a position different from the second end face cam 80B (below the third intermediate gear 94 in FIG. 13). The second end face cam 80B is provided at the same position as in the first embodiment (in FIG. 13, to the right of the third intermediate gear 94). The first contact member 70 </ b> A has the contact portion 71 in contact with the first end face cam 80 </ b> A, reciprocates in conjunction with the first end face cam 80 </ b> A being rotationally driven, and moves the thermistor 60. Note that the arrangement and structure of the second end face cam 80B and the second contact member 70B are substantially the same as those in the first embodiment, and a description thereof will be omitted. However, since the thermistor 60 is attached to the first contact member 70A, it is not necessary to attach it to the second contact member 70B. Since other configurations are the same as those in the first embodiment, the first embodiment will be referred to and description thereof will be omitted.

  As described above, the thermistor 60 and the peeling claw 33 are configured to move in conjunction with the transmission mechanisms (the end face cam 80 and the contact member 70) corresponding to each. Therefore, by providing a transmission mechanism corresponding to each of the thermistor 60 and the peeling claw 33, different movements can be made, and a movement range corresponding to each can be obtained. In the fourth embodiment, the thermistor 60 is disposed upstream of the fixing nip region N1 in the rotation direction of the fixing roller 31. In other words, by detecting the temperature of the fixing roller 31 immediately before reaching the fixing nip region N1, the fixing temperature can be grasped more accurately.

  It should be noted that the embodiment disclosed herein is illustrative in all respects and does not serve as a basis for limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiment, but is defined based on the description of the scope of claims. Moreover, all the changes within the meaning and range equivalent to a claim are included.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 12 Fixing apparatus 31 Fixing roller (an example of a rotating member)
32 Pressure roller (an example of a pressure member)
33 Peeling nail (an example of a peeling member)
34 Cleaning member 60 Thermistor (example of temperature detection member)
60A Planar thermistor 60B Inclined thermistor 62 Detection surface 62a Inclined portion 70 Contact member (an example of transmission mechanism)
70A 1st contact member 70B 2nd contact member 71 Contact part 72 Compression spring 80 End face cam (an example of transmission mechanism)
80A First end face cam 80B Second end face cam 91 Winding roller driving gear (an example of a transmission mechanism)
92 1st intermediate gear (an example of a transmission mechanism)
93 Second intermediate gear (an example of a transmission mechanism)
94 Third intermediate gear (an example of a transmission mechanism)
N1 Fixing nip area N2 Wiping nip area Z-axis direction

Claims (9)

A rotating member that rotates and conveys the paper; and a pressurizing member that presses against the rotating member and pressurizes the paper, and sandwiches the paper between the rotating member and the pressurizing member, A fixing device for fixing a formed toner image,
A temperature detecting member for detecting the temperature of the peripheral surface of the rotating member;
A cleaning member that rotates and cleans the peripheral surface of the rotating member;
A fixing device comprising: a transmission mechanism that transmits a driving force for rotating the cleaning member to move a contact position of the temperature detecting member with respect to the rotating member. The fixing device according to claim 1,
The fixing device, wherein the temperature detection member is configured to reciprocate in the axial direction of the rotating member. The fixing device according to claim 2,
The temperature detection member is provided with a detection surface in contact with the peripheral surface of the rotating member,
The fixing device according to claim 1, wherein the detection surfaces are provided with inclined portions that are inclined in a direction away from the peripheral surface of the rotating member toward both ends in the axial direction of the rotating member. A fixing device according to any one of claims 1 to 3, wherein
It is configured to include a plurality of the temperature detection members,
The fixing device according to claim 1, wherein the temperature detecting member is provided at a position facing an axial center and an end of the rotating member. A fixing device according to any one of claims 1 to 4, wherein
The fixing mechanism includes an end face cam that rotates by a driving force of the cleaning member, and a contact member that reciprocates the temperature detection member in conjunction with the end face cam. apparatus. A fixing device according to any one of claims 1 to 5, comprising:
A peeling member for peeling the paper conveyed by the rotating member;
The fixing device according to claim 1, wherein the transmission mechanism moves a contact position of the peeling member with respect to the rotating member. The fixing device according to claim 6, wherein
The fixing device according to claim 1, wherein the temperature detection member and the peeling member are provided at positions separated from each other in the axial direction of the rotating member. The fixing device according to claim 6 or 7, wherein
It is configured to include a plurality of the transmission mechanisms,
The fixing device according to claim 1, wherein the temperature detection member and the peeling member are configured to move in conjunction with the corresponding transmission mechanisms.   An image forming apparatus comprising the fixing device according to claim 1.

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