JP2006139034A - Fixing device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing device capable of preventing slackness of a fastening member such as a screw for fastening wiring and to provide an image forming apparatus provided with the fixing device. <P>SOLUTION: In the fixing device 30, in which a screw 70 is used for fastening the wiring 76 and a cover member 62 which covers at least the screw 70 is provided, a protrusion part 66 abutting to a head part 70A of the screw 70 is disposed on the inner surface of the cover member 62. Further, when the fixing device 30 is loaded on an image forming apparatus main body 12, a protrusion part 84 which presses the cover member 62 is disposed on the image forming apparatus main body 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fixing device that fixes a toner image transferred to a recording medium such as recording paper, and an image forming apparatus including the fixing device. More specifically, the present invention relates to a temperature rise safety device (thermostat) provided in the fixing device. The present invention relates to means for preventing loosening of a fastening member such as a screw used for connecting a wiring from a power supply unit.

  The image forming apparatus includes a fixing device that fixes an unfixed toner image transferred onto a recording sheet by an image carrier onto the recording sheet using a heating roller and a pressure roller. This fixing device can be attached to and detached from the image forming apparatus, and can be removed from the image forming apparatus when the replacement is performed due to the life or the like, or when the jam of the recording paper to be conveyed is performed.

In addition, the fixing device is provided with wiring for energizing the heater in the heating roller from the power supply unit via the thermostat, and the wiring is mainly formed of a metal screw or the like in the casing of the fixing device. (For example, refer to Patent Document 1). However, the fixing device having such a configuration has a problem that screws and the like are loosened due to temperature fluctuations. That is, when the wiring is attached with a metal screw or the like, the screw or the like may be expanded or contracted (loosened) due to thermal influence, and troubles such as failure may occur.
JP 2003-5575 A

  In view of the above circumstances, an object of the present invention is to obtain a fixing device and an image forming apparatus that can prevent loosening of a fastening member such as a screw for fastening wiring.

  In order to achieve the above object, a fixing device according to a first aspect of the present invention is a fixing device in which a screw is used for fastening a wiring and at least a cover member that covers the screw is provided. A convex portion that contacts the head of the screw is provided on the inner surface of the cover member.

  According to the first aspect of the present invention, since the convex portion provided on the inner surface of the cover member abuts on the head portion of the screw, loosening of the screw can be prevented by the convex portion.

  Further, in the fixing device according to claim 2, in the fixing device according to claim 1, when the cover member is slid and attached from a side of the fixing device, the convex portion is a surface in the sliding direction. It is characterized in that it is formed in a substantially trapezoidal shape in plan view with the side being an inclined surface.

  According to the second aspect of the present invention, when the cover member is slid from the side and attached to the fixing device, the convex portion provided on the inner surface of the cover member is smoothly applied without resistance to the head of the screw. Can be touched.

  According to a third aspect of the present invention, there is provided the fixing device according to the third aspect, wherein a faston terminal is used to fasten the wiring, and at least a cover member that covers the faston terminal is provided. A convex portion for regulating the position of the faston terminal is provided on the inner surface.

  Since the convex part provided in the inner surface of the cover member regulates the position of the faston terminal, the faston terminal can be prevented from coming off by the convex part.

  According to a fourth aspect of the present invention, in the fixing device in which the faston terminal is used for fastening the wiring, the position of the faston terminal is located at a portion of the fixing device in which the faston terminal is accommodated. It is characterized by providing a convex part for regulating the above.

  According to the fourth aspect of the present invention, since the convex portion provided in the portion where the faston terminal of the fixing device is accommodated regulates the position of the faston terminal, the faston terminal can be prevented from coming off by the convex portion. .

  According to a fifth aspect of the present invention, in the fixing device according to any one of the first to third aspects, the cover member has a heat radiating window.

  According to the fifth aspect of the present invention, an increase in the temperature of the portion covered with the cover member is avoided. Therefore, expansion and contraction due to temperature fluctuations of the screw and the faston terminal is suppressed, and loosening of the screw and removal of the faston terminal can be suppressed.

  According to a sixth aspect of the present invention, there is provided an image forming apparatus comprising: a fixing device that is detachably attached to the main body of the image forming device and uses a screw for fastening wiring; When the image forming apparatus main body is mounted on the image forming apparatus main body, the image forming apparatus main body is provided with a convex portion that contacts the head of the screw.

  According to the sixth aspect of the present invention, when the fixing device is mounted on the image forming apparatus main body, the convex portion provided on the image forming apparatus main body comes into contact with the head of the screw. Therefore, loosening of the screw can be prevented by the convex portion.

  According to a seventh aspect of the present invention, the image forming apparatus according to the present invention is detachable from the main body of the image forming apparatus, a screw is used for fastening the wiring, and at least a cover member that covers the screw is provided. In the image forming apparatus including the fixing device, the convex portion that presses the cover member and abuts the cover member on the head of the screw when the fixing device is mounted on the image forming apparatus main body. It is provided in the forming apparatus main body.

  According to the seventh aspect of the present invention, when the fixing device is mounted on the image forming apparatus main body, the convex portion provided on the image forming apparatus main body presses the cover member. Thereby, the cover member comes into contact with the head of the screw. Therefore, loosening of the screw can be prevented by the cover member.

  An image forming apparatus according to an eighth aspect of the present invention is detachable from the main body of the image forming apparatus, a screw is used for fastening the wiring, and a cover member that covers at least the screw is provided. In the image forming apparatus including the fixing device, a convex portion that contacts the head of the screw is formed on the inner surface of the cover member, and when the fixing device is mounted on the image forming apparatus main body, the cover The image forming apparatus main body is provided with a convex portion for pressing the member.

  According to the eighth aspect of the present invention, when the fixing device is mounted on the image forming apparatus main body, the convex portion of the image forming apparatus main body presses the cover member. And thereby, the convex part of a cover member contacts the head of a screw. Therefore, it is possible to reliably prevent the screws from loosening.

  An image forming apparatus according to claim 9 is the image forming apparatus according to claim 7 or 8, wherein the cover member has a heat radiating window.

  According to the ninth aspect of the present invention, the temperature rise of the portion covered with the cover member is avoided. Therefore, expansion and contraction due to temperature variation of the screw is suppressed, and loosening of the screw can be suppressed.

  An image forming apparatus according to a tenth aspect is the image forming apparatus according to any one of the sixth to ninth aspects, wherein the fixing device is pivotally supported by the image forming apparatus main body. It is characterized in that it can be attached and detached from the surface side to which the screw is fastened by opening and closing and a pressing portion for pressing the fixing device is provided on the opening and closing cover.

  According to the tenth aspect of the present invention, the fixing device is pressed against the pressing portion by closing the opening / closing cover. Therefore, the head of the screw is pressed against the convex portion. That is, this makes it possible to suitably prevent the screws from loosening.

  Further, in the image forming apparatus according to claim 11, in the image forming apparatus according to claim 6, when the fixing device is inserted and attached to the image forming apparatus main body from the side, the convex portion is provided. Is characterized in that it is formed in a substantially trapezoidal shape in plan view in which the surface side into which the fixing device is inserted is inclined.

  According to the eleventh aspect of the present invention, when the fixing device is slid from the side and attached to the image forming apparatus main body, the convex portion provided on the image forming apparatus main body resists the head of the screw. And can be brought into contact smoothly.

  An image forming apparatus according to a twelfth aspect of the present invention is the image forming apparatus provided with a fixing device that is detachable from the main body of the image forming device and uses a Faston terminal for fastening the wiring. When the apparatus is mounted on the image forming apparatus main body, the image forming apparatus main body is provided with a convex portion that regulates the position of the faston terminal.

  According to the twelfth aspect of the invention, when the fixing device is mounted on the image forming apparatus main body, the convex portion provided on the image forming apparatus main body regulates the position of the faston terminal. Can be prevented in the part.

  As described above, according to the present invention, it is possible to provide a fixing device and an image forming apparatus that can prevent loosening of a fastening member such as a screw that fastens wiring.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below in detail based on the embodiments shown in the drawings. FIG. 1 is a schematic side view showing a configuration of an image forming apparatus 10 according to the present invention. As shown in FIG. 1, the image forming apparatus 10 includes an image forming apparatus main body 12 and a paper feeding device 14.

  The image forming apparatus main body 12 is uniformly charged and then irradiated with image light, whereby an electrostatic latent image is formed on the surface, and the surface of the image carrier 16 is uniformly charged. A charging device 18 that irradiates the image carrier 16 with image light based on the image data and forms a latent image by a difference in electrostatic potential, and selectively transfers toner to the latent image for visualization. The developing device 20, the transfer device 26 for transferring the toner image (unfixed image) on the surface of the image carrier 16 to the recording paper supplied along the conveyance path 38, and heating and pressurizing the toner image on the recording paper. A fixing device 30 for fusing and a cleaning device 28 for cleaning toner remaining on the image carrier 16 after the toner image is transferred are provided.

  Here, the image carrier 16 has a photoreceptor layer on the surface, and the potential of the exposed portion is attenuated by exposure after being uniformly charged. On the other hand, the charging device 18 is a roll-shaped member that comes into contact with the image carrier 16, and when a voltage is applied between them, a discharge is generated in a minute gap near the contact portion, and the image carrier. In this configuration, the surface of the body 16 is charged substantially uniformly. In addition, as the charging device 18, a device that applies a high voltage to the electrode wire and charges the image carrier 16 by corona discharge can be used.

  The optical box 24 scans the peripheral surface of the image carrier 16 with a blinking laser, and forms an electrostatic latent image based on the image data on the peripheral surface of the image carrier 16. In addition, as the optical box 24, light emitting elements, such as LED, may be arranged, and these may be blinked based on image data.

  The developing device 20 includes a cylindrical developing roller 22 disposed so as to face the image carrier 16 in close proximity, and a developing bias voltage is applied between the developing roller 22 and the image carrier 16. It has become so. As a result, a developing bias electric field is formed between the developing roller 22 and the image carrier 16, and charged toner is transferred to the exposed portion on the image carrier 16 to form a visible image.

  The developing device 20 is unitized so as to be detachable from the image forming apparatus main body 12. That is, the upper surface (paper discharge tray) of the image forming apparatus main body 12 is an upper cover 40 configured to be rotatable in the vertical direction around a support shaft 42 that is installed in the width direction in the vicinity of the fixing device 30. The developing device 20 is configured to be detachable from an opening in which the upper cover 40 is opened.

  The transfer device 26 is a roll-shaped member provided so as to face the image carrier 16, and forms a transfer electric field with the image carrier 16 to transfer the toner image onto the passing recording paper. It is a configuration. Then, after the toner image is transferred onto the recording paper by the transfer device 26, the recording paper is separated from the image carrier 16.

  The separated recording paper is conveyed to the fixing device 30 through the conveyance path 38. The recording paper is heated and pressed by the fixing device 30 to fix the toner image, and is then discharged out of the apparatus (on the paper discharge tray). Further, after the transfer is completed, the surface of the image carrier 16 is cleaned by the cleaning device 28 to prepare for the next image forming process.

  On the other hand, below the image forming apparatus main body 12, a paper feeding device 14 that feeds recording sheets one by one into the image forming apparatus main body 12 is provided. The paper feeding device 14 includes a detachable paper feeding cassette 32 that can be pulled out in the direction opposite to the direction in which the recording paper is fed out. The paper feed cassette 32 is not limited to the two stages shown in the figure.

  In the vicinity of the front end of the paper feed cassette 32, paper feed rollers 34 for feeding recording paper from the paper feed cassette 32 are provided. Further, a separating member (not shown) that is pressed against the paper feed roller 34 is provided on the front end side of the paper feed cassette 32, and the recording paper in the paper feed cassette 32 is fed one by one. It is like that. The recording paper fed from the paper feeding device 14 is conveyed to a toner image transfer position at a predetermined timing by a registration roller pair 36 provided in the vicinity of the paper feeding device 14.

  Next, the fixing device 30 will be described. As shown in FIGS. 1 and 2, the fixing device 30 is unitized so as to be detachable from the image forming apparatus main body 12, and the image forming apparatus main body 12 has a unit for attaching and detaching the fixing device 30. A back cover 46 that opens and closes the opening is disposed so as to be rotatable about a support shaft 48.

  The fixing device 30 includes a housing 50 having a substantially rectangular parallelepiped shape, and a pressure roller 52 and a heating roller 54 are rotatably supported on the housing 50. The pressure roller 52 and the heating roller 54 are configured so that their peripheral surfaces face each other and are in pressure contact (nip) with a predetermined pressure. That is, the pressure roller 52 is urged toward the heating roller 54 by the load spring 56.

  In addition, the fixing device 30 is provided with a recording paper carry-in port and a carry-out port formed of a pressure roller 52 and a heating roller 54 along the width direction, and the recording guided through the conveyance path 38. The paper is carried in from the carry-in entrance, passes through the nip portion constituted by the pressure roller 52 and the heating roller 54, and is carried out from the carry-out exit.

  The pressure roller 52 is provided with a heat-resistant elastic body layer (silicon sponge, Asker hardness: 40 degrees) on a stainless steel or iron core, and a release layer (PFA tube: film thickness) having a low friction coefficient on the surface layer. 30 μm). On the other hand, the heating roller 54 is composed of a hollow metal core (iron or aluminum base tube: thickness 1.0 mm to 1.5 mm) provided with a release layer (PFA tube: film thickness 30 μm) having a low friction coefficient on the surface layer. A heater (not shown) is arranged inside.

  Further, the fixing device 30 is provided with a connector (not shown). By connecting the connector to the power supply unit 44 (see FIG. 1) provided in the image forming apparatus main body 12, the heater of the heating roller 54 is provided. Is raised to a predetermined temperature to melt the toner image on the conveyed recording paper.

  Further, the fixing device 30 is provided with a driven gear 58 (see FIG. 2), and the heating roller 54 rotates by meshing with a drive gear (not shown) of the image forming apparatus main body 12. Thus, the recording paper is conveyed in a nipped state, and the toner image is fixed on the recording paper.

  As shown in FIG. 2, the housing 50 is formed with a housing recess 60 in which a wiring 76 and the like for energizing the heater disposed in the heating roller 54 from the power supply unit 44 through the thermostat 78 is housed. The wiring 76 and the thermostat 78 are fastened to the housing 50 by a metal screw 70. As shown in the figure, a cover member 62 may be attached to the accommodation recess 60.

[Example 1]
In the fixing device 30 having the above configuration, the loosening prevention means of the screw 70 according to the present invention will be described next. First, the case where the cover member 62 is not provided in the accommodation recess 60 will be described. As shown in FIG. 3, the substantially cylindrical convex portions 84 are the same as the screws 70 on the wall surface 82 facing the accommodating recess 60 in the accommodating portion 80 in which the fixing device 30 of the image forming apparatus main body 12 is mounted. And it is provided so that it may become the same position.

  Therefore, after the fixing device 30 is mounted in the housing portion 80 of the image forming apparatus main body 12, the back cover 46 of the image forming apparatus main body 12 is closed to thereby form a substantially rectangular parallelepiped elastic pressing member 47 provided on the inner surface thereof. However, at this time, the convex portion 84 protruding from the wall surface 82 comes into contact with the head portion 70A of the screw 70 (the head portion 70A of the screw 70). Press). As a result, loosening of each screw 70 caused by temperature fluctuation is prevented. Note that the elastic pressing member 47 provided on the inner surface of the back cover 46 is not limited to the two illustrated.

  As shown in FIG. 4, the image forming apparatus main body 12 is provided with a lock lever 86, and by closing the lock lever 86, the fixing device 30 is pushed (slid) and fixed to the wall surface 82 side. In this case, the height of the convex portion 84 may be appropriately set according to the sliding distance of the fixing device 30 by the lock lever 86. In any case, by providing such a convex portion 84 on the wall surface 82, the head portion 70A of the screw 70 can be pressed by the convex portion 84, so that loosening of each screw 70 caused by temperature fluctuation is prevented. The

[Example 2]
As shown in FIG. 5, when the fixing device 30 is slid from the side of the image forming apparatus main body 12, the fixing device 30 is slid and inserted into the wall surface 82 of the image forming apparatus main body 12. A projecting portion 88 having a substantially trapezoidal shape in a plan view in which a surface facing the device 30 is an inclined surface 88A is provided. With such a shape, the projecting portion 88 can be smoothly brought into contact with the head portion 70 </ b> A of the screw 70 without resistance by a sliding operation for mounting the fixing device 30 to the image forming apparatus main body 12.

  Note that only one convex portion 88 protrudes in a flat plate shape having a predetermined height, and each screw 70 provided in the width direction of the fixing device 30 (the axial direction of the pressure roller 52 and the heating roller 54). So that each screw 70 can be pressed, and is extended in the width direction. Even with the convex portion 88 having such a configuration, loosening of each screw 70 caused by temperature fluctuation can be prevented.

[Example 3]
Next, the case where the cover member 62 is provided with respect to the accommodation recess 60 will be described. The cover member 62 is used to prevent the fingers from touching the wiring 76, the thermostat 78, etc., and to hold the wiring 76 so that it does not float outward from the inside of the housing recess 60. The cover member 62 is formed of a resin material or the like. Has been. Then, as shown in FIGS. 2, 6, and 7, the cover member 62 is attached to the housing 50 in a fitting manner without using a metal fastening member (screw or the like) that is affected by temperature fluctuations. It is supposed to be.

  That is, the cover member 62 has an engagement protrusion 64 having a substantially “L” shape in plan view that engages with an engagement hole 60 </ b> A provided at the edge of the housing recess 60. 64 bent end portions are inserted into the engagement holes 60A and slid in the direction of arrow A shown in FIG.

  The cover member 62 is provided with a plurality of window portions (for example, slits) 62 </ b> A for radiating heat generated in the housing recess 60. Thereby, the temperature rise in the accommodation recessed part 60 is avoided, and the looseness of the screw 70 and the disengagement from the socket part 74 of the faston terminal 72 described later are suppressed.

  Even when the cover member 62 as described above is provided, the loosening of the screw 70 can be prevented in the same manner as described above. That is, as shown in FIGS. 6 and 7, substantially cylindrical convex portions 66 are provided on the inner surface between the window portions 62 </ b> A of the cover member 62 so as to have the same number and the same positions as the screws 70, and the cover member 62 is What is necessary is just to set it as the structure which the convex part 66 contact | abuts to the head 70A of the screw 70, when attaching to the housing | casing 50. FIG.

  In this case, as shown in FIG. 8, it is preferable that the end surface of the convex portion 66 on the slide direction (arrow A direction) side is an inclined surface 66A. That is, it is preferable that the convex portion 66 is formed in a substantially trapezoidal shape in plan view in which at least the sliding direction side is an inclined surface 66A. With such a shape, the projection 66 can be smoothly brought into contact with the head 70 </ b> A of the screw 70 without resistance by a sliding operation for attaching the cover member 62 to the housing 50 (the fixing device 30).

[Example 4]
Further, the fixing device 30 is mounted on the image forming apparatus main body 12 and the back cover 46 is closed (or the lock lever 86 is operated), so that the fixing device 30 protrudes from the wall surface 82 in the accommodating portion 80 of the image forming apparatus main body 12. The convex portion 84 may press the cover member 62 to prevent the screw 70 from loosening.

  That is, as shown in FIGS. 9 and 10, the cover member 62 is bent when the outer surface of the cover member 62 is pressed by the convex portion 84 protruding from the wall surface 82 in the housing portion 80 of the image forming apparatus main body 12. It is good also as a structure which deform | transforms and the inner surface contact | abuts to the head 70A of the screw 70 (presses the head 70A of the screw 70).

  In this case, there is an advantage that it is not necessary to project the projection 66 on the inner surface of the cover member 62. However, as shown in FIGS. 6 and 11, the projection 66 is projected on the inner surface of the cover member 62. Is preferred. When the convex portion 66 is provided on the inner surface of the cover member 62, the head portion 70A of the screw 70 can be further pressed by the convex portion 66, so that the loosening of the screw 70 can be prevented more reliably. Can do. In any case, even if the cover member 62 is attached to the housing recess 60, the screws 70 can be prevented from loosening.

[Example 5]
Next, the case where the wiring 76 of the thermostat 78 is joined (fastened) by the faston terminal 72 will be described. As shown in FIG. 12, the faston terminal 72 is formed in a flat plate shape and is inserted into the socket portion 74 having a substantially flat cylindrical shape from the width direction of the fixing device 30 (the axial direction of the pressure roller 52 and the heating roller 54). A substantially hemispherical fitting convex part (fitting concave part) 74A formed in the approximate center of the socket part 74 is fitted into a substantially hemispherical fitting concave part (fitting convex part) 72A formed in the approximate center of the faston terminal 72. It is a terminal joined by fitting.

  Since the faston terminal 72 and the socket portion 74 are also made of metal, the faston terminal 72 may be detached from the socket portion 74 due to temperature fluctuation. Therefore, a convex portion 68 for preventing the faston terminal 72 from falling off from the socket portion 74 is projected from the accommodating concave portion 60.

  The convex portion 68 restricts the wiring 76 side end portion of the faston terminal 72 from both sides of the wiring 76 so that the faston terminal 72 does not fall out of the socket portion 74. As shown in FIG. It extends in a direction perpendicular to the width direction 30 and is formed in a pair of ribs with the center cut away so as to allow the wiring 76.

  When such a convex portion 68 is provided, even if the faston terminal 72 is likely to be detached from the socket portion 74 due to temperature fluctuation, the end portion on the wiring 76 side of the faston terminal 72 interferes with the convex portion 68. Dropping from is prevented. In addition, since the convex part 68 protrudes in the accommodation recessed part 60, the connection of the Faston terminal 72 and the socket part 74 is taken out from the accommodation recessed part 60, and is performed.

  That is, as shown in FIG. 12 (A), after connecting the faston terminal 72 and the socket part 74, as shown in FIG. 12 (B), the wiring 76 and the thermostat 78 in the housing recess 60 (housing 50). Is attached with screws 70. Further, as described in the first to fourth embodiments, the screw 70 is prevented from being loosened, that is, the screw 70 is prevented from loosening and the faston terminal 72 is prevented from coming off.

[Example 6]
Further, the convex portion 68 is not limited to the one that protrudes into the accommodating recess 60, and may be protruded from the wall surface 82 in the accommodating portion 80 of the image forming apparatus main body 12, or the cover member 62 may be provided. If provided, the cover member 62 may protrude from the inner surface. When the convex portion 68 is provided on the wall surface 82 of the image forming apparatus main body 12, the faston terminal 72 is prevented from being detached when the fixing device 30 is attached to the image forming apparatus main body 12, and is provided on the inner surface of the cover member 62. In this case, the faston terminal 72 is prevented from coming off when the housing recess 60 is closed by the cover member 62.

  For example, when the cover member 62 is provided, as shown in FIG. 13, the same rib shape as described above for restricting the wiring 76 side end of the faston terminal 72 from both sides of the wiring 76 on the inner surface of the cover member 62. The protrusion 68 may be provided in a protruding manner. The shape of the convex portion 68 is not limited to the shape shown in FIGS. 12 and 13. For example, as shown in FIG. 14, the width direction of the fixing device 30 (the axes of the pressure roller 52 and the heating roller 54). The rib shape may be parallel to the direction), or may be a rib shape bent in a substantially “L” shape in plan view as shown in FIG.

  In any case, as long as the end portion of the faston terminal 72 on the wiring 76 side can be regulated from one side of the wiring 76, preferably from both sides, it is not limited to the illustrated one. 14 and 15 show the case where the convex portion 68 protrudes from the inner surface of the cover member 62. The convex portion 68 having such a shape is used as the housing concave portion 60 of the fixing device 30 or the image forming apparatus main body. Needless to say, the twelve wall surfaces 82 may be projected.

  As described above in the first to sixth embodiments, the metal screw 70 and the Faston terminal are connected to the fastening member that fastens the wiring 76 for energizing the heater in the heating roller 54 from the power supply unit 44 via the thermostat 78. In the fixing device 30 using 72, the looseness of the screw 70 and the disengagement of the faston terminal 72 from the socket part 74 can be suitably prevented. Therefore, in the fixing device 30, it is possible to prevent the occurrence of troubles such as a failure and to ensure the safety thereof.

  In particular, when the protrusion 66 is provided on the inner surface of the cover member 62, if the screw 70 is not screwed correctly (is loose), the cover member 62 is lifted as shown in FIG. Since the fixing device 30 cannot be attached to the forming apparatus main body 12, if the method of tightening the screw 70 is insufficient, it is immediately determined. Therefore, the safety of the fixing device 30 can be further improved.

  Note that the loosening prevention means of the screw 70 and the disengagement prevention means of the faston terminal 72 according to the present invention are not limited to the fixing device 30 provided in the image forming apparatus 10, and mainly temperature fluctuations are caused thereby. The present invention can be widely applied to devices and the like in which the wiring 76 is fastened (joined) using the metal screws 70 and the faston terminals 72 that expand and contract.

Schematic side view showing the configuration of an image forming apparatus provided with a fixing device Schematic perspective view showing the fixing device Schematic perspective view showing a housing portion of an image forming apparatus main body on which a fixing device is mounted Schematic side view showing the process of attaching the fixing device to the housing of the image forming apparatus main body Schematic perspective view showing a housing portion of the image forming apparatus main body to which the fixing device is mounted from the side Schematic perspective view showing the accommodating portion of the image forming apparatus main body to which the fixing device to which the cover member is attached is mounted. Schematic plan view showing the process of attaching the cover member to the fixing device Partially enlarged schematic cross-sectional view showing the process in which the convex part of the cover member comes into contact with the head of the screw Schematic side view showing the process in which the cover member comes into contact with the head of the screw by closing the back cover Schematic side view showing the process in which the cover member comes into contact with the head of the screw by the lock lever Schematic side view of the fixing device in which the convex portion of the cover member is in contact with the head of the screw by the convex portion of the image forming apparatus main body. The schematic perspective view which shows the accommodation recessed part in which the convex part which prevents disengagement of a Faston terminal is formed Partially broken schematic front view showing a cover member formed with a convex portion for preventing the faston terminal from coming off Partially broken schematic front view showing a cover member formed with a convex portion for preventing the faston terminal from coming off Partially broken schematic front view showing a cover member formed with a convex portion for preventing the faston terminal from coming off Schematic perspective view of the fixing device showing a state where the screws are not screwed correctly

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Image forming apparatus main body 20 Developing apparatus 30 Fixing apparatus 40 Upper cover 44 Power supply part 46 Back cover (open / close cover)
47 Elastic pressing member (pressing part)
DESCRIPTION OF SYMBOLS 50 Case 52 Pressure roller 54 Heating roller 60 Accommodating recessed part 62 Cover member 64 Window part 66 Convex part 68 Convex part 70 Screw 70A Head 72 Faston terminal 74 Socket part 76 Wiring 78 Thermostat 80 Containment part 82 Wall surface 84 Convex part 88 Convex part Part

Claims (12)

In the fixing device in which a screw is used for fastening the wiring and a cover member that covers at least the screw is provided.
A fixing device according to claim 1, wherein a convex portion that contacts the head of the screw is provided on an inner surface of the cover member.   When the cover member is slid and attached from the side of the fixing device, the convex portion is formed in a substantially trapezoidal shape in plan view in which a surface side in the sliding direction is an inclined surface. Item 4. The fixing device according to Item 1. In the fixing device in which a faston terminal is used for fastening the wiring, and at least a cover member that covers the faston terminal is provided,
A fixing device, wherein a convex portion for restricting a position of the faston terminal is provided on an inner surface of the cover member. In fixing devices where Faston terminals are used to fasten the wiring,
The fixing device according to claim 1, wherein a convex portion for restricting a position of the faston terminal is provided at a portion where the faston terminal of the fixing device is accommodated.   The fixing device according to claim 1, wherein the cover member includes a heat radiating window. In an image forming apparatus provided with a fixing device that can be attached to and detached from the image forming apparatus main body and screws are used for fastening wiring.
An image forming apparatus comprising: a convex portion that contacts the head of the screw when the fixing device is mounted on the main body of the image forming apparatus. In an image forming apparatus provided with a fixing device that is detachable from an image forming apparatus main body and that uses screws for fastening wiring and is provided with at least a cover member that covers the screws.
When the fixing device is mounted on the image forming apparatus main body, the image forming apparatus main body is provided with a convex portion that presses the cover member and abuts the cover member on a screw head. Image forming apparatus. In an image forming apparatus provided with a fixing device that is detachable from an image forming apparatus main body and that uses screws for fastening wiring and is provided with at least a cover member that covers the screws.
A convex portion that contacts the head of the screw is formed on the inner surface of the cover member, and the convex portion that presses the cover member when the fixing device is attached to the image forming apparatus main body is provided in the image forming apparatus. An image forming apparatus provided on a main body.   The image forming apparatus according to claim 7, wherein the cover member includes a heat radiating window.   The fixing device is detachable from the surface side to which the screw is fastened by opening and closing an opening / closing cover pivotally supported by the image forming apparatus main body, and a pressing portion that presses the fixing device to the opening / closing cover. The image forming apparatus according to claim 6, wherein the image forming apparatus is provided.   When the fixing device is inserted and attached to the image forming apparatus main body from the side, the convex portion is formed in a substantially trapezoidal shape in plan view in which a surface side into which the fixing device is inserted is an inclined surface. The image forming apparatus according to claim 6. In an image forming apparatus provided with a fixing device that can be attached to and detached from the image forming apparatus main body and faston terminals are used for fastening wiring.
An image forming apparatus comprising: a convex portion for restricting a position of the faston terminal when the fixing device is mounted on the image forming apparatus main body.

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