JP2013068744A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of satisfactorily conveying a recording material, without providing a special cleaning device.SOLUTION: A separating part 45 of a fixing device 40 is an abutting part contacting an outer peripheral surface 42a of a pressurizing roller 42 while butting against the outer peripheral surface 42a. Abutting of the separating part 45 against the outer peripheral surface 42a can prevent a recording material P from being wound around the outer peripheral surface 42a of the pressurizing roller 42. An angle adjusting part 46b of the separating part 45 adjusts a position and a posture of a supporting part 45a with respect to the pressurizing roller 42. For example, an angle adjusting part 46b adjusts an angle of a contact area 49 with respect to the outer peripheral surface 42a, while the separating part 45 is energized by an energizing part 46a, and the pressurizing roller 42 is rotating. Thereby, removal processing for removing a contaminant 5 from the contact area 49 of the separating part 45 can be executed without detaching the separating part 45 from the pressurizing roller 42.

Description

  The present invention relates to a copying machine, a printer, a facsimile machine, and an image forming apparatus having a combination of these functions.

  2. Description of the Related Art Conventionally, a technique for removing dirt adhered to a fixing roller and a pressure roller by moving a separation claw in the axial direction of the fixing roller and the pressure roller is known (for example, Patent Document 1).

  In addition, a technique for cleaning a separation claw that separates a sheet by coming into contact with a pressure roller while being separated from the pressure roller is also known (for example, Patent Document 2).

  Further, a technique for removing unfixed toner adhering to the separation nail from the separation nail by vibrating the separation nail while separating the separation nail from the surface of the fixing roller is also known (for example, Patent Document 3). ).

JP 2006-330618 A JP 2011-033873 A Japanese Patent Laying-Open No. 2005-099426

Here, in the techniques described in Patent Documents 1 to 3, in order to clean the separation claw or peeling claw (contact portion) that is in contact with the fixing roller or the pressure roller,
(1) a driving device for separating the separation claw or peeling claw from the fixing roller or pressure roller; and
(2) A cleaning device for removing contaminants from the separation nail or peeling nail,
Is required. As a result, there arises a problem that the hardware configuration near the separation claw or the peeling claw becomes complicated.

  Therefore, an object of the present invention is to provide an image forming apparatus capable of transporting a recording material satisfactorily without providing a special cleaning device.

  In order to solve the above-mentioned problems, the invention of claim 1 includes a pair of rotating bodies that convey the recording material by rotating each of the recording materials sandwiched between them, Of the rotating body, the outer peripheral surface such that a contact portion that contacts the outer peripheral surface in contact with the outer peripheral surface and a part of the contact surface formed on the contact portion are in contact with the outer peripheral surface. An urging portion that urges the abutting portion with respect to the angle, and an angle adjusting portion that adjusts an angle of the contact surface with respect to the outer peripheral surface in a state where the abutting portion is urged by the urging portion. It is characterized by providing.

  According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the abutting portion has a blade edge, and a tip of the blade edge is on at least one outer peripheral surface of the pair of rotating bodies. A separating portion that prevents the recording material from being wound around the outer peripheral surface by contact; and the urging portion is separated from the outer peripheral surface so that the blade edge contacts the outer peripheral surface. The angle adjustment unit adjusts the angle of the contact surface formed on the blade edge in a state where the separation unit is urged by the urging unit.

  According to a third aspect of the present invention, in the image forming apparatus according to the second aspect, the angle adjusting unit is configured such that each portion of the contact surface from the front end side of the blade edge to the rear end side is the outer peripheral surface. The angle of the contact surface is adjusted so as to come into contact with the contact surface.

  According to a fourth aspect of the present invention, in the image forming apparatus according to the second or third aspect, a part of the contact surface of the separating portion is a rough surface, and the angle adjusting portion is The angle of each contact surface is adjusted such that a part of the rough contact surface comes into contact with the outer peripheral surface.

  According to a fifth aspect of the present invention, in the image forming apparatus according to the first aspect, the contact portion is a temperature sensor that detects a temperature of the pair of rotating bodies.

  According to a sixth aspect of the present invention, in the image forming apparatus according to any one of the first to sixth aspects, the pair of rotating bodies are a fixing roller and a pressure roller.

  According to the first to sixth aspects of the present invention, the angle of the contact surface with respect to the outer peripheral surface can be adjusted while rotating the pair of rotating bodies in a state where the contact portion is biased by the biasing portion. Thereby, the removal process which removes a contaminant from a contact surface can be performed, without separating a separation part. Therefore, by performing the removal process at an appropriate timing, it is possible to effectively prevent the contaminants in the contact portion from adhering to the recording material conveyed by the pair of rotating members.

  In particular, according to the second aspect of the present invention, contaminants can be removed from the contact surface formed on the blade edge. Therefore, it is possible to effectively prevent the contaminants on the cutting edge of the separation unit from adhering to the recording material conveyed by the pair of rotating bodies.

  In particular, according to the third aspect of the present invention, in the removal process for removing contaminants from the contact surface of the blade edge, each part of the contact surface from the front end side to the rear end side is in contact with the outer peripheral surface. In addition, the angle of the contact surface can be adjusted. Thereby, each part of a contact surface can be made to contact equally with respect to the outer peripheral surface which rotates. Therefore, the contaminant removal process can be executed more efficiently.

  Particularly, in the invention described in claim 4, a part of the contact surface of each separation portion is rough. Thereby, while a part of contact surface made into rough surface contacts an outer peripheral surface, an outer peripheral surface can be grind | polished by rotating a pair of rotary body. Therefore, the surface roughness of the entire outer peripheral surface can be made the same regardless of whether or not the separation part comes into contact.

  In particular, according to the fifth aspect of the present invention, contaminants can be removed from the contact surface formed on the temperature sensor. Therefore, it is possible to effectively prevent the contamination of the temperature sensor from adhering to the recording material conveyed by the pair of rotating bodies.

FIG. 3 is a front view illustrating an example of the overall configuration of the printer according to the first and second embodiments of the present invention. It is a front view which shows an example of a structure of the fixing device vicinity in 1st and 2nd embodiment. It is a front view which shows an example of a structure of the isolation | separation part vicinity in 1st and 2nd embodiment. It is a top view which shows an example of the structure of the isolation | separation part vicinity in 1st Embodiment. It is a front view which shows an example of a structure of the blade part vicinity in 1st Embodiment. It is a front view which shows an example of the positional relationship of a pressure roller and a isolation | separation part at the time of a removal process. It is a front view which shows an example of the positional relationship of a pressure roller and a isolation | separation part at the time of a removal process. It is a front view which shows an example of the positional relationship of a pressure roller and a isolation | separation part at the time of a removal process. It is a front view which shows an example of the structure of the isolation | separation part vicinity in 2nd Embodiment. It is a front view which shows an example of a structure of the blade part vicinity in 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<1. First Embodiment>
<1.1. Printer configuration>
FIG. 1 is a front view illustrating an example of the overall configuration of the printer 1 according to the present embodiment. FIG. 2 is a front view showing an example of the configuration in the vicinity of the fixing device 40 in the present embodiment. Here, the printer 1 is an image forming apparatus for printing a monochrome image or a color image by an electrophotographic method. The printer 1 can be incorporated in a multi-function machine having a copy function, a print function, a facsimile function, and the like. As shown in FIG. 1, the printer 1 mainly includes a color image forming unit 10, a paper feed unit 30, a fixing device 40, a paper discharge unit 50, a display unit 80, and a control unit 90. Yes.

  In addition, in FIG. 1 and the subsequent drawings, an XYZ orthogonal coordinate system in which the Z-axis direction is a vertical direction and the XY plane is a horizontal plane is appropriately attached as necessary to clarify the directional relationship. Yes. Further, the arrows attached to the paper feed path R1, the paper discharge path R2, and the transport path Ra in FIG. 1 indicate the “transport direction of the recording material P” (hereinafter simply referred to as “transport direction”).

  The color image forming unit 10 prints a monochrome image or a color image on the recording material P supplied via the paper feed path R1 and the transport path Ra. As shown in FIG. 1, the color image forming unit 10 mainly includes an image forming unit 11 (11Y, 11M, 11C, and 11K), a print head unit 20 (20Y, 20M, 20C, and 20K), and an intermediate transfer belt 21. And have.

  A plurality (four in the present embodiment) of image forming units 11 correspond to the respective colors of yellow (Y), magenta (M), cyan (C), and black (K). As shown in FIG. 1, each image forming unit 11 (11Y, 11M, 11C, 11K) mainly includes a photosensitive drum 13 (13Y, 13M, 13C, 13K) and a charger 14 (14Y, 14M, 14C, 14K), developing device 17 (17Y, 17M, 17C, 17K), primary transfer roller 18 (18Y, 18M, 18C, 18K), and cleaner 19 (19Y, 19M, 19C, 19K) Yes.

  Here, a so-called tandem system is adopted as the color image forming unit 10 of the present embodiment, and each image forming unit 11 (11Y, 11M, 11C, 11K) is, for example, yellow, Magenta, cyan, and black are arranged along the intermediate transfer belt 21 in this order. Each image forming unit 11 (11Y, 11M, 11C, 11K) is disposed below the intermediate transfer belt 21.

  In the present embodiment, the image forming units 11Y, 11M, 11C, and 11K have the same type of hardware configuration. Therefore, in the following, the image forming unit 11Y and the photosensitive drum 13Y, the charger 14Y, the developing device 17Y, the primary transfer roller 18Y, and the cleaner 19Y that are the components of the image forming unit 11Y will be described in detail.

  For convenience of illustration, each of the photosensitive drums 13M, 13C, 13K, chargers 14M, 14C, 14K, developing units 17M, 17C, 17K, primary transfer rollers 18M, 18C, 18K, and cleaners 19M, 19C, 19K. Reference numerals are omitted in FIG. 1 and subsequent figures.

  The photosensitive drum 13Y has a cylindrical shape or a columnar shape, and is disposed on the opposite side of the primary transfer roller 18 with the intermediate transfer belt 21 interposed therebetween. A photoconductive film is provided on the outer peripheral surface of the photosensitive drum 13Y.

  Therefore, light is emitted from the corresponding print head unit 20Y to the outer peripheral surface of the photosensitive drum 13Y, and the charge on the irradiated portion is removed, so that the electrostatic latent image corresponding to yellow appears on the outer peripheral surface of the photosensitive drum 13Y. Is formed. Similarly, electrostatic latent images corresponding to magenta, cyan, and black are formed on the outer peripheral surfaces of the photosensitive drums 13M, 13C, and 13K, respectively.

  The charger 14Y applies a charge to the outer peripheral surface of the photosensitive drum 13Y. The developing unit 17Y supplies a yellow toner to the photosensitive drum 13Y on which the electrostatic latent image is formed, thereby forming a toner image based on the electrostatic latent image on the outer peripheral surface of the photosensitive drum 13Y.

  As shown in FIG. 1, the primary transfer roller 18Y is disposed on the opposite side of the photosensitive drum 13Y with the intermediate transfer belt 21 interposed therebetween. The primary transfer roller 18Y is given a charge having a polarity opposite to that of the outer peripheral surface of the photosensitive drum 13Y. Thus, when the intermediate transfer belt 21 is sandwiched between the photosensitive drum 13Y and the primary transfer roller 18Y while the photosensitive drum 13Y and the primary transfer roller 18Y are rotating, a yellow toner image is transferred to the intermediate transfer belt 21. The

  The cleaner 19Y transfers the toner remaining on the photosensitive drum 13Y to the outer peripheral surface of the photosensitive drum 13Y after the toner image is transferred to the intermediate transfer belt 21 and before the next yellow toner is supplied from the developing unit 17Y. Remove from. As shown in FIG. 1, the cleaner 19Y is provided at a position where it can come into contact with the outer peripheral surface of the photosensitive drum 13Y.

  The print head unit 20 (20Y, 20M, 20C, 20K) is a so-called exposure unit, and irradiates the corresponding photosensitive drum 13 (13Y, 13M, 13C, 13K) with laser light. Thereby, an electrostatic latent image is formed on the outer peripheral surface of the corresponding photosensitive drum 13 (13Y, 13M, 13C, 13K).

  The intermediate transfer belt 21 transfers the four color toner images primarily transferred by the image forming units 11 (11Y, 11M, 11C, and 11K) to the recording material P. As shown in FIG. 1, the intermediate transfer belt 21 is wound around a driving roller 22 and a driven roller 23, and the driving roller 22 and the driven roller 23 rotate counterclockwise in FIG. Further, the secondary transfer roller 25 is disposed on the opposite side of the driving roller 22 across the transport path Ra, and contacts the outer periphery of the intermediate transfer belt 21.

  Accordingly, the four-color toner images formed on the outer periphery of the intermediate transfer belt 21 are recorded by adjusting the feed timing of the intermediate transfer belt 21 and the conveyance timing of the recording material P conveyed on the conveyance path Ra. Secondary transfer is performed on the material P.

  The developer supplied from the developing device 17 of each image forming unit 11 is preferably a one-component developer that does not use a carrier, but may be a two-component developer that includes a toner and a carrier.

  The paper feed unit 30 is used as a supply unit that supplies the recording material P to the color image forming unit 10. As shown in FIG. 1, the paper feed unit 30 mainly includes a paper feed cassette 31 and a paper feed roller 32.

  The paper feed cassette 31 is a storage unit that can store a plurality of recording materials P. The paper feed roller 32 feeds a plurality of recording materials P accommodated in the paper feed cassette 31 in order from the uppermost layer and supplies the fed recording materials P to the paper feed path R1.

  The fixing device 40 fixes the toner image transferred onto the recording material P. As shown in FIG. 1, the fixing device 40 is disposed on the downstream side of the secondary transfer roller 25 in the path along the transport path Ra. As shown in FIGS. 1 and 2, the fixing device 40 mainly includes a fixing roller 41, a pressure roller 42, an induction heating unit 43, and a separation unit 45.

  As shown in FIG. 1, the fixing roller 41 and the pressure roller 42 (a pair of rotating bodies) are disposed on both sides of the transport path Ra. When the recording material P is sandwiched between the rollers 41 and 42, the rollers 41 and 42 rotate, whereby the recording material P is conveyed to the paper discharge unit 50 side.

  The induction heating unit 43 is a heater that heats the fixing roller 41. As shown in FIG. 2, the induction heating unit 43 has a coil 43 a disposed adjacent to the fixing roller 41. Therefore, a high-frequency alternating current flows through the coil 43 a and an eddy current is generated on the surface of the fixing roller 41, thereby generating Joule heat and heating the fixing roller 41.

  The separation portion 45 is a contact portion that contacts (contacts) in a state of being abutted against the outer peripheral surface 42 a of the pressure roller 42. When the separation part 45 contacts the outer peripheral surface 42a, the recording material P can be prevented from being wound around the outer peripheral surface 42a. The detailed configuration of the separation unit 45 will be described later.

  The paper discharge unit 50 is provided on the downstream side of the fixing device 40 in the transport direction, and discharges the recording material P on which the toner image is fixed to the outside of the apparatus. That is, the recording material P supplied to the paper discharge unit 50 via the transport path Ra is guided to the paper discharge path R2. As shown in FIG. 1, the paper discharge unit 50 mainly includes a paper discharge roller pair 51 provided on the paper discharge path R <b> 2 and a paper discharge tray 52.

  The display unit 80 is configured by a liquid crystal display, for example, and has a function as a “touch panel” that can specify a position on the screen by touching the screen with a finger or a dedicated pen. Therefore, the user of the printer 1 (hereinafter simply referred to as “user”) gives an instruction using the “touch panel” function of the display unit 80 based on the content displayed on the display unit 80, so that the printer 1, a predetermined process (for example, a process of printing a toner image on the recording material P supplied from the paper feeding unit 30) can be executed. Thus, the display unit 80 can be used as a receiving unit that receives an input operation from the user.

  The operation unit 85 is an input unit configured by a plurality of keypads. For example, when the print start button 86 included in the operation unit 85 is pressed, a printing process is performed on the recording material P. In this way, the operation unit 85 can be used as a reception unit that receives an input operation from the user, similarly to the display unit 80.

  As shown in FIG. 1, the control unit 90 is provided below the paper discharge tray 52. The control unit 90 realizes operation control of each element of the printer 1 and data calculation. For example, the control unit 90 receives an image signal from an external terminal (not shown) or the like and converts it into digitized image data for YK colors, as well as the color image forming unit 10 and the paper feeding unit 30. By controlling operations such as these, printing processing on the recording material P can be executed.

<1.2. Configuration of separation unit>
3 and 4 are a front view and a plan view, respectively, showing an example of the configuration in the vicinity of the separation portion 45 in the present embodiment. FIG. 5 is a front view showing an example of the configuration in the vicinity of the blade portion 47. A plurality (three for convenience of illustration in FIG. 4) of separation portions 45 are arranged along the extending direction of the pressure roller 42. As shown in FIG. 3, each separation part 45 mainly includes a support part 45 a, an urging part 46 a, an angle adjustment part 46 b, and a blade part 47. Here, as shown in FIG. 4, the rotation shaft 40 a of the pressure roller 42 is set to be parallel to the extending direction of the pressure roller 42.

  The support part 45a is an L-shaped body provided with a blade part 47 at one end. The blade edge 48 is provided in a portion of the blade portion 47 that faces the outer peripheral surface 42 a of the pressure roller 42. As shown in FIG. 3, when a toner image is printed on the recording material P, the tip 48 a of the blade edge 48 abuts on the outer peripheral surface 42 a of the pressure roller 42.

  Thereby, even when the recording material P sticks to the outer peripheral surface 42a of the pressure roller 42 due to the influence of heat at the time of fixing, the space between the conveyed recording material P and the outer peripheral surface 42a of the pressure roller 42. The cutting edge 48 is inserted into Therefore, even when the recording material P sticks to the outer peripheral surface 42 a of the pressure roller 42, the recording material P can be separated from the pressure roller 42, and the recording material P is wound around the outer peripheral surface 42 a of the pressure roller 42. Can be prevented.

  The urging portion 46a is formed of an elastic body such as a winding spring, for example, and one end (free end) is fixed to the support portion 45a. As shown in FIG. 3 (and FIGS. 5 to 8 described later), a part of the contact surface 49 formed on the separation portion 45 is in contact with the outer peripheral surface 42a so as to contact the outer peripheral surface 42a of the pressure roller 42. The separation unit 45 is biased. Thereby, the front-end | tip 48a of the blade edge | tip 48 contacts the outer peripheral surface 42a.

  The angle adjustment unit 46 b adjusts the position and posture of the support unit 45 a with respect to the pressure roller 42. For example, the angle adjustment unit 46b adjusts the angle of the contact surface 49 with respect to the outer peripheral surface 42a in a state where the separation unit 45 is urged by the urging unit 46a and the pressure roller 42 is rotated.

<1.3. Contaminant removal treatment>
6 to 8 are front views showing an example of the positional relationship between the pressure roller 42 and the separation unit 45 during the contaminant 5 removal process. Here, in the present embodiment, “contaminant” refers to, for example, toner and paper dust attached to the separation unit 45 from the recording material P and the pressure roller 42 when the printing process is executed. When the contaminant 5 is peeled off from the separation unit 45 and adheres to the recording material P during the printing process, printing failure occurs in the recording material P.

  Therefore, in the present embodiment, such a problem of defective printing is prevented by executing the removal process of the contaminant 5 at the timing when the printing process is not executed.

  As shown in FIG. 5, in the contact surface 49 formed on the blade edge 48, when the contaminant 5 is deposited on the tip 48 a side of the blade edge 48, the support portion 45 a is located near the tip 48 a of the blade edge 48. It is rotated by the biasing part 46a and the angle adjusting part 46b so as to be the center of rotation.

  In addition, as shown in FIG. 7, when the contaminant 5 is accumulated on a portion of the contact surface 49 formed on the blade edge 48 on the rear end 48 b side of the blade edge 48, the support portion 45 a The biasing portion 46a and the angle adjusting portion 46b are rotated so that the vicinity of the end 48b is in contact with the outer peripheral surface 42a.

  Thereby, the contaminant 5 deposited on the front end 48a side and the rear end 48b side of the blade edge 48 comes into contact with the outer peripheral surface 42a of the pressure roller 42 as shown in FIGS. The contact surface 49 falls off due to the frictional force caused by

  Therefore, as shown in FIG. 5 and FIG. 7, at the timing when the printing process is not executed, even if the contaminant 5 is attached to either the front end 48 a side or the rear end 48 b side of the blade edge 48. The contaminant 5 can be removed from the contact surface 49. As a result, it is possible to effectively prevent the contaminant 5 from adhering to the recording material P conveyed by the fixing roller 41 and the pressure roller 42 during the printing process, and a printing defect due to the contaminant 5 occurs. Can be prevented.

  Further, in the removal process for removing the contaminant 5 from the contact surface 49 of the blade edge 48, the angle adjustment unit 46 b is configured such that each part of the contact surface 49 from the tip 48 a to the rear end 48 b of the blade edge 48 is the outer periphery of the pressure roller 42. The angle of the contact surface 49 can be adjusted so as to contact the surface 42a. Thereby, the angle adjustment part 46b can contact each part of the contact surface 49 equally with respect to the rotating outer peripheral surface 42a. Therefore, the contaminant 5 removal process can be executed more efficiently.

<1.4. Advantages of Printer of First Embodiment>
As described above, in the printer 1 according to the present embodiment, the contact surface 49 with respect to the outer peripheral surface 42a is rotated while the fixing roller 41 and the pressure roller 42 are rotated in a state where the separation unit 45 is urged by the urging unit 46a. Can be adjusted. Accordingly, the printer 1 removes the contaminant 5 from the contact surface 49 of the separation unit 45 without separating the separation unit 45 from the pressure roller 42 at an appropriate timing (for example, timing when the printing process is not performed). The removal process to remove can be performed. Therefore, it is possible to effectively prevent the contaminant 5 of the blade edge 48 from adhering to the recording material P conveyed by the fixing roller 41 and the pressure roller 42. As a result, the printing process on the recording material P can be executed satisfactorily.

<2. Second Embodiment>
Next, a second embodiment of the present invention will be described. The printers 1 and 100 of the first and second embodiments have the same hardware configuration except that the configurations of the corresponding separating units 45 and 145 are different. Therefore, in the following, this difference will be mainly described.

  In addition, the same code | symbol is attached | subjected to the same component in the printers 1 and 100, and the component to which this same code | symbol was attached | subjected has been demonstrated in 1st Embodiment. For this reason, in the present embodiment, description of components having the same reference numerals is omitted.

<2.1. Configuration of separation unit>
FIG. 9 is a plan view showing an example of the configuration near the separation unit 145 in the present embodiment. FIG. 10 is a front view showing an example of the configuration near the blade portion 47.

  A plurality (three for convenience of illustration in FIG. 9) of separation portions 145 are arranged along the extending direction of the pressure roller 42 (arrow AR1 direction). As shown in FIG. 10, a part of the contact surface 49 (specifically, the rear end 48b side of the cutting edge 48) is rough.

  Accordingly, a part of the contact surface 49 (rough surface portion 148d) in which each separation portion 145 has a rough surface shape comes into contact with the outer peripheral surface 42a, and the fixing roller 41 and the pressure roller 42 are rotated. The outer peripheral surface 42a can be polished.

  As described above, in the present embodiment, the angle adjustment unit 46b is configured so that each contact of each separation unit 145 is such that a part of the contact surface 49 that is the rough surface portion 148d is in contact with the outer peripheral surface 42a of the pressure roller 42. The angle of the surface 49 can be adjusted.

  Here, when the printing process is executed by the printer 100, filming that is whitish and cloudy due to contaminants such as paper dust attached to the outer peripheral surface 42a of the pressure roller 42 occurs. And the fine unevenness | corrugation resulting from filming generate | occur | produces in the outer peripheral surface 42a.

  On the other hand, filming occurs in a portion of the outer peripheral surface 42a of the pressure roller 42 that contacts the contact surface 49 of the separation portion 145 (more specifically, the contact region 42b in FIG. 9). Difficult to produce gloss difference. That is, the surface roughness of the contact region 42b is smaller than the surface roughness of the outer peripheral surface 42a excluding the contact region 42b. As a result, a streak-like print defect corresponding to the contact area 42b occurs on the recording material P.

  In contrast, in the present embodiment, as described above, the contact region 42b of the outer peripheral surface 42a can be polished by the rough surface portion 148d. Thereby, the surface roughness of the whole outer peripheral surface 42a can be made the same. Therefore, by performing the polishing process with the rough surface portion 148d periodically, it is possible to prevent printing defects due to filming.

<2.2. Advantages of Printer of Second Embodiment>
As described above, the printer 100 according to the present embodiment is similar to the printer 1 according to the first embodiment in that each contact surface 49 of each separation unit 145 is not separated from the pressure roller 42. The removal process which removes the contaminant 5 from can be performed.

  Further, the separation unit 145 of the printer 100 according to the present embodiment has a rough surface portion 148d. For this reason, the polishing process of the contact region 42b by the rough surface portion 148d is periodically performed, so that printing defects due to filming can be prevented in advance.

<3. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made.

  (1) In the first and second embodiments, the separation units 45 and 145 have been described as being in contact with the outer peripheral surface 42a of the pressure roller 42, but are not limited thereto. For example, the separation units 45 and 145 may be configured to contact the outer peripheral surface of the fixing roller 41. Also in this case, it is possible to effectively prevent the contaminants 5 of the separating portions 45 and 145 from adhering to the recording material P conveyed by the fixing roller 41 and the pressure roller 42. In this case, the separation units 45 and 145 are in contact with at least one outer peripheral surface of the fixing roller 41 and the pressure roller 42 configured as a pair of rotating bodies.

  (2) In the first and second embodiments, the contaminants 5 attached to the contact surface 49 are removed by using the separating portions 45 and 145. It is not limited to this. For example, the contaminant attached to the contact surface may be removed by adjusting the angle of the contact surface of the “temperature sensor 41a” (see FIG. 2) with respect to the outer peripheral surface of the fixing roller 41. Also in this case, it is possible to effectively prevent the contamination of the temperature sensor 41a from adhering to the recording material P conveyed by the fixing roller 41 and the pressure roller 42.

  (3) Further, in the first and second embodiments, it has been described that the separation units 45 and 145 to be removed of the contaminants 5 are provided in the fixing devices 40 and 140. However, the present invention is not limited to this. It is not what is done.

  For example, the separation unit may be provided on at least one of the drive roller 22 and the secondary transfer roller 25. Also in this case, it is possible to effectively prevent contaminants on the blade edge from adhering to the recording material P conveyed by the drive roller 22 and the secondary transfer roller 25.

1,100 Printer (image forming device)
5 Contaminant 10 Color image forming unit 11 (11Y, 11M, 11C, 11K) Image forming unit 13 Photosensitive drum 18 Primary transfer roller 21 Intermediate transfer belt 22 Drive roller 25 Secondary transfer roller 30 Paper feed unit 40, 140 Fixing device 40a Rotating shaft 41 Fixing roller 41a Temperature sensor 42 Pressure roller 42a Outer peripheral surface 45, 145 Separating part (contact part)
46a Energizing portion 46b Angle adjusting portion 47 Blade portion 48 Cutting edge 48a Front end 48b Rear end 49 Contact surface 148d Rough surface portion AR1 Arrow R1 Paper feed path R2 Paper discharge path Ra Conveyance path P Recording material

Claims (6)

(a) a pair of rotating bodies that convey the recording material by rotating each of the recording materials sandwiched between the recording materials;
(b) Of the pair of rotating bodies, an abutting portion that comes into contact with at least one outer peripheral surface;
(c) a biasing portion that biases the contact portion against the outer peripheral surface such that a part of the contact surface formed on the contact portion contacts the outer peripheral surface;
(d) an angle adjusting unit that adjusts an angle of the contact surface with respect to the outer peripheral surface in a state where the contact portion is biased by the biasing portion;
An image forming apparatus comprising: The image forming apparatus according to claim 1.
The abutting portion has a blade edge, and the separation prevents the recording material from being wound around the outer circumferential surface when the tip of the blade edge contacts at least one outer circumferential surface of the pair of rotating bodies. Department,
The urging portion urges the separation portion with respect to the outer peripheral surface such that the cutting edge contacts the outer peripheral surface,
The image forming apparatus according to claim 1, wherein the angle adjusting unit adjusts an angle of the contact surface formed on the blade edge in a state where the separating unit is urged by the urging unit. The image forming apparatus according to claim 2.
The said angle adjustment part adjusts the angle of the said contact surface so that each part of the said rear end side from the front end side of the said blade edge may contact the said outer peripheral surface among the said contact surfaces. Forming equipment. The image forming apparatus according to claim 2 or 3,
A part of the contact surface of the separation part is a rough surface,
The image forming apparatus according to claim 1, wherein the angle adjusting unit adjusts the angle of each contact surface so that a part of the rough contact surface contacts the outer peripheral surface. The image forming apparatus according to claim 1.
The image forming apparatus, wherein the contact portion is a temperature sensor that detects a temperature of the pair of rotating bodies. The image forming apparatus according to any one of claims 1 to 6,
The pair of rotators is a fixing roller and a pressure roller.

Images