JP2013242484A - Grounding device, fixing device, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electronic component from coming off to the outside of a storage space through an opening.SOLUTION: A grounding device comprises: a circuit that grounds a contact member contacting a recording medium on which an image is transferred to a reference potential; an electronic component that is provided in the circuit, and has an electronic component body and terminals; a grounding device body that has a storage space storing the electronic component body; and an opening that is formed on the grounding device body, through which the terminals protrude to the outside of the storage space, and has the size through which the electronic component body cannot pass.

Description

  The present invention relates to a grounding device, a fixing device, and an image forming apparatus.

  Patent Document 1 discloses a thin film heat resistant film having a conductive layer moving along the outer surface of a heater holder holding a heater, and a nip between the thin film heat resistant film pressed against the heater and the thin film heat resistant film. In a heat fixing device having a pressure rotator that forms a part, a charge induction unit composed of a module that is detachable from the device main body causes the thin heat-resistant film surface from the conductive layer on the recording medium. A configuration in which a charge having the same polarity as that of an unfixed image is induced is disclosed.

JP 2001-42669 A

  This invention makes it a subject to control that an electronic component slips out of accommodation space through an opening part.

  According to a first aspect of the present invention, there is provided a circuit for grounding a contact member that contacts a recording medium on which an image has been transferred to a reference potential, an electronic component that is provided in the circuit and has an electronic component body and a terminal, and the electronic component body. A grounding device main body having a housing space for housing the housing, and an opening formed in the grounding device main body, projecting the terminal out of the housing space, and having a size through which the electronic component main body cannot pass. It is a grounding device.

  According to a second aspect of the present invention, a plurality of the electronic components are provided, and the grounding device main body is housed in the housing spaces and the housing spaces in which the electronic component bodies of the electronic components are housed. 2. The grounding device according to claim 1, wherein each of the electronic component main bodies has a plurality of receiving openings through which the plurality of receiving openings pass, and the plurality of receiving openings face different directions.

  According to a third aspect of the present invention, a fixing device main body, a heating member provided in the fixing device main body for heating a recording medium on which an image has been transferred, and a pressure member in pressure contact with the heating member are provided in the fixing device main body. A pressure member that pressurizes the recording medium; a guide member that is provided in the fixing device main body and guides the recording medium between the heating member and the pressure member; and is attached to the fixing device main body. A grounding device according to claim 1, wherein at least one of the heating member, the pressure member, and the guide member is grounded to a reference potential.

  According to a fourth aspect of the present invention, in the grounding device, in a state in which an accommodation port through which the electronic component main body accommodated in the accommodation space passes is formed in the grounding device main body and attached to the fixing device main body. The fixing device according to claim 3, wherein the accommodation port is closed by an inner wall of the fixing device.

According to a fifth aspect of the present invention, the fixing device main body is formed with a hole through which the electronic component main body cannot pass and which allows the electronic component main body accommodated in the accommodating space to be visually recognized. 4. The fixing device according to 4.

  The invention of claim 6 is an image forming apparatus comprising: a transfer unit that transfers an image to a recording medium; and the fixing device according to claim 4 or 5 that fixes the image transferred by the transfer unit to the recording medium. is there.

  According to the configuration of the first aspect of the present invention, the electronic component can be prevented from coming out of the accommodation space through the opening.

  According to the structure of Claim 2 of this invention, the mistake of attachment of an electronic component can be suppressed compared with the case where the accommodation port in this structure is not provided.

  According to the structure of Claim 3 of this invention, it can control that an electronic component slips out of accommodation space through an opening part, and damages a heating member and a pressurization member.

  According to the configuration of the fourth aspect of the present invention, the number of parts can be reduced as compared with the case where the accommodating port is closed with a dedicated part.

  According to the structure of Claim 5 of this invention, it can control that an electronic component slips out of accommodation space through a hole.

  According to the configuration of the sixth aspect of the present invention, it is possible to regulate image deterioration caused by the electronic component coming out of the accommodation space through the opening and damaging the heating member and the pressure member.

1 is a schematic diagram illustrating a configuration of an image forming apparatus according to an exemplary embodiment. FIG. 3 is an exploded perspective view illustrating a part of the configuration of the fixing device according to the exemplary embodiment. FIG. 2 is an exploded perspective view showing a configuration of a fixing device according to the present embodiment. 1 is a perspective view illustrating a configuration of a fixing device according to an exemplary embodiment. It is a perspective view which shows the structure of the grounding apparatus of the state attached with respect to the roll support body which concerns on this embodiment. It is a perspective view which shows the structure of the grounding apparatus which concerns on this embodiment. It is a perspective view which cuts and shows a part of grounding device concerning this embodiment. It is a perspective view which cuts and shows a part of grounding device concerning this embodiment. It is a side view of the grounding device concerning this embodiment. It is a sectional side view of the grounding device concerning this embodiment. It is the perspective view which looked up at the grounding device concerning this embodiment from the lower side.

  Below, an example of an embodiment concerning the present invention is described based on a drawing.

(Configuration of image forming apparatus 10)
First, the configuration of the image forming apparatus 10 will be described. FIG. 1 is a schematic diagram illustrating a configuration of the image forming apparatus 10.

  As shown in FIG. 1, the image forming apparatus 10 includes an image forming apparatus main body 11 in which each component is housed. In the image forming apparatus main body 11, a plurality of storage units 12 that store recording media P such as paper, an image forming unit 14 that forms an image on the recording medium P, and from the storage unit 12 to the image forming unit 14. A transport unit 16 that transports the recording medium P and a control unit 20 that controls the operation of each unit of the image forming apparatus 10 are provided. In addition, a discharge unit 18 for discharging the recording medium P on which an image is formed by the image forming unit 14 is provided on the upper portion of the image forming apparatus main body 11.

  The image forming unit 14 includes a photosensitive drum 32 as an image holding body that holds an image. The photosensitive drum 32 rotates in one direction (for example, counterclockwise in FIG. 1). Around the photosensitive drum 32, a charging roll 23 as a charging device for charging the photosensitive drum 32 and the photosensitive drum 32 charged by the charging roll 23 are exposed in order from the upstream side in the rotation direction of the photosensitive drum 32. An exposure device 36 that forms an electrostatic latent image on the photosensitive drum 32; a developing device 38 that develops the electrostatic latent image formed on the photosensitive drum 32 by the exposure device 36 to form a black toner image; A transfer roll 26 is provided as an example of a transfer unit that transfers the black toner image formed on the photosensitive drum 32 by the developing device 38 to the recording medium P.

  The exposure device 36 is configured to form an electrostatic latent image based on the image signal sent from the control unit 20. Examples of the image signal sent from the control unit 20 include an image signal acquired by the control unit 20 from an external device.

  Above the exposure device 36, a toner cartridge 58 is provided as a toner storage container that stores toner. The toner contained in the toner cartridge 58 is conveyed to the developing device 38 by a toner conveying device (not shown).

  The transfer roll 26 is opposed to the photosensitive drum 32, and conveys the recording medium P upward with the recording medium P sandwiched between the photosensitive drum 32. Between the transfer roll 26 and the photosensitive drum 32 is a transfer position T at which the toner image formed on the photosensitive drum 32 is transferred to the recording medium P.

  The transport unit 16 is disposed along the transport path 48, a transport roll 48 that feeds the recording medium P accommodated in each storage section 12, a transport path 48 that transports the recording medium P sent by the transport roll 46, and the transport path 48. And a plurality of transport rolls 50 for transporting the recording medium P delivered by the delivery roll 46 to the transfer position T.

  Above the transfer position T (on the downstream side in the transport direction), a fixing device 60 that fixes the toner image transferred to the recording medium P by the transfer roll 26 to the recording medium P is provided. A discharge roll 52 that discharges the recording medium P on which the toner image is fixed to the discharge unit 18 is provided above the fixing device 60 (downstream in the transport direction). A specific configuration of the fixing device 60 will be described later.

  Further, the reverse conveyance path 37 for reversing the recording medium P with the toner image fixed on one side and sending it back to the transfer position T again is the opposite side to the photosensitive drum 32 with respect to the transfer roll 26 (the right side in FIG. 1). ). When images are formed on both sides of the recording medium P, the recording medium P having a toner image fixed on one side is switched back by the discharge roll 52 and guided to the reverse conveyance path 37 and sent back to the transfer position T. It is like that.

(Image forming operation)
Next, an image forming operation for forming an image on the recording medium P in the image forming apparatus 10 will be described.

  In the image forming apparatus 10, the recording medium P sent out from any of the storage units 12 by the sending roll 46 is sent to the transfer position T by the plurality of transport rolls 50.

  On the other hand, in the image forming unit 14, the photosensitive drum 32 is charged by the charging roll 23, and then exposed by the exposure device 36, so that an electrostatic latent image is formed on the photosensitive drum 32. The electrostatic latent image is developed by the developing device 38 to form a black toner image on the photosensitive drum 32. The black toner image is transferred to the recording medium P at the transfer position T by the transfer roll 26.

  The recording medium P onto which the toner image has been transferred is conveyed to the fixing device 56 and the toner image is fixed by the fixing device 56. When an image is formed only on one side of the recording medium P, the recording medium P is discharged to the discharge unit 18 by the discharge roll 52 after the toner image is fixed.

  When forming an image on both sides of the recording medium P, after the image is formed on one side, the recording medium P is switched back by the discharge roll 52, reversed, and sent to the reverse conveyance path 37. Further, the recording medium is sent again from the reverse conveyance path 37 to the transfer position T, and an image is formed on the opposite surface where no image is recorded in the same manner as described above, and is discharged to the discharge unit 18 by the discharge roll 52. . As described above, a series of image forming operations are performed.

(Configuration of Fixing Device 60)
Next, the configuration of the fixing device 60 according to the present embodiment will be described. 2 to 4 are diagrams illustrating the configuration of the fixing device 60 according to the present embodiment.

  As shown in FIG. 2, the fixing device 60 according to this embodiment includes a heating roll 70 as an example of a heating member, a pressure belt 80 as an example of a pressure member, and a first that supports the heating roll 70. A roll support 62 as a support part and a pair of belt support plates 66 as a second support part for supporting the pressure belt 80 are provided.

  Specifically, the heating roll 70 is made of a metal material (conductive material) such as aluminum, iron, and stainless steel, and is formed of a cylindrical member (roll portion). A heating source 71 such as a halogen lamp is provided in the internal space of the heating roll 70. Both ends of the heating source 71 in the axial direction protrude from both ends of the heating roll 70 in the axial direction, and are fixed to the roll support 62. The outer periphery of the heating roll 70 is covered with a release layer (not shown) for peeling the recording medium P. The release layer is made of, for example, a resin (for example, a fluorine resin).

  Both ends in the axial direction of the heating roll 70 are rotatably supported by the roll support 62 by bearings 74. The heating roll 70 is rotated by a rotational force transmitted from a drive motor (not shown) through a gear 72 fixed to one end in the axial direction thereof. Specifically, the bearing 74 is composed of, for example, an annular ball bearing, and is formed of a metal material (conductive material) such as stainless steel.

  Specifically, the roll support 62 functions as a frame (fixing device main body) of the fixing device 60, and includes a support main body 63 having a length along the axial direction of the heating roll 70, and a support. And a first attachment portion 61 provided at both ends in the longitudinal direction of the body main body 63 and to which one end portion of a tension spring 68 as an elastic member is attached.

  Below the roll support 62, an introduction side guide member (introduction side chute) 64 as an example of a guide member for guiding the recording medium P to a contact area (nip portion) between the heating roll 70 and the pressure belt 80. Is fixed by screwing. The introduction side guide member 64 is made of sheet metal (conductive material), for example. A shaft portion 64B that rotatably supports the pair of belt support plates 66 is formed on the inner surface of the side wall 64A of the introduction side guide member 64.

  The pressure belt 80 includes an endless belt 80A, a support 80B that is provided on the inner periphery of the endless belt 80A and supports the endless belt 80A, and side plates 80C that are attached to both ends of the support 80B. ing.

  The support body 80B has a length along the axial direction of the endless belt 80A, and has protrusions 80D that protrude from both ends of the endless belt 80A in the axial direction. The side plate 80C projects outward in the radial direction of the endless belt 80A, and regulates the movement of the pressure belt 80 in the axial direction. Further, the side plate 80C is formed with a through hole 80E through which the protruding portion 80D of the support 80B is inserted.

  The pair of belt support plates 66 are formed with insertion grooves 66A into which the protrusions 80D of the support 80B are inserted. The insertion groove 66A is open to the heating roll 70 side. The pair of belt support plates 66 supports the pressure belt 80 by inserting the protrusion 80D of the support body 80B into the insertion groove 66A. The pair of belt support plates 66 and the support body 80B are made of sheet metal (conductive material), for example.

  The pair of belt support plates 66 is formed with an insertion hole 66C into which the shaft portion 64B of the introduction side guide member 64 is inserted. By inserting the shaft portion 64B of the introduction side guide member 64 into the insertion hole 66C, the pair of belt support plates 66 are supported so as to be rotatable around the axis of the shaft portion 64B of the introduction side guide member 64. Thus, the pair of belt support plates 66 are configured to be displaced with respect to the roll support 62 so that the pressure belt 80 contacts and separates from the heating roll 70.

  Further, the pair of belt support plates 66 has a second attachment portion 66B to which the other end portion of the tension spring 68 is attached. The second attachment portion 66B is configured by a convex portion as a hooked portion to which a hook 68B formed at the other end portion of the tension spring 68 is hooked.

  The tension spring 68 pulls the pair of belt support plates 66 and the roll support 62 at a position away from the shaft portion 64B by the elastic force so that the pressure belt 80 is brought into pressure contact with the heating roll 70. It has become. Thereby, a contact region (nip portion) is formed between the heating roll 70 and the pressure belt 80.

  Thus, the pressure belt 80 that is in pressure contact with the heating roll 70 is rotated by the rotation of the heating roll 70 that is driven to rotate. Accordingly, the recording medium P on which the toner image is transferred is sandwiched and conveyed by the heating roll 70 and the pressure belt 80, the recording medium P (toner) is heated by the heating roll 70, and the recording medium is recorded by the pressure belt 80. P (toner) is pressurized to fix the toner image.

  As shown in FIGS. 3 and 4, the fixing device 60 further includes a discharge side guide member that guides the recording medium P discharged from the contact area between the heating roll 70 and the pressure belt 80 to the discharge roll 52. (Discharge chute) 90 and a cover 96 as a covering member that covers a part of the pressure belt 80 in the circumferential direction.

  On the upper surface of the discharge side guide member 90, a rib 90A is formed along the conveyance direction of the recording medium P. The discharge-side guide member 90 covers a part of the heating roll 70 in the circumferential direction, and forms the outer wall of the fixing device 60.

  On the outer surface of the cover 96, a rib 96A is formed along the conveyance direction of the recording medium P. The outer surface of the cover 96 constitutes a part of the conveyance path surface of the above-described reversal conveyance path 37 (see FIG. 1) and forms the outer wall of the fixing device 60.

  Further, as shown in FIG. 4, the recording medium P conveyed between the discharge guide member 90 and the cover 96 from the contact area (nip portion) of the heating roll 70 and the pressure belt 80 to the discharge roll 52. The detection member 98 which detects this is provided. Ribs 98A are formed on the upper and lower surfaces of the detection member 98 along the conveyance direction of the recording medium P. In FIG. 3, the detection member 98 is not shown.

  In the present embodiment, the roll support 62, the discharge side guide member 90, the cover 96, and the detection member 98 are made of a resin material such as PET.

(Configuration of grounding device 100)
Next, the configuration of the grounding device 100 according to the present embodiment will be described.

  The grounding device 100 uses a heating roll 70, a pressure belt 80, and an introduction-side guide member 64, which are examples of contact members that come into contact with a recording medium on which an image is transferred, to a reference potential (the image forming apparatus body 11 (the image forming apparatus 10). A device (module) to be grounded to the main body frame)). As shown in FIG. 5, the grounding device 100 is one end in the longitudinal direction (end in the Z direction) of the support body 63 of the roll support 62, and is the side of the heating source 71 in the side view (viewed in the X direction). It is arranged at a position overlapping the terminal 71A.

  As shown in FIGS. 5, 6, and 7, the grounding device 100 sets the grounding device main body 102 and the heating roll 70, the pressure belt 80, and the introduction side guide member 64 provided on the grounding device main body 102 to the reference potential. A circuit (conduction structure) 110 to be grounded, a resistor 120 as an example of an electronic component provided in the circuit 110, and a diode 130 (see FIG. 7) are included.

  The grounding device body 102 is formed of a resin material (insulating material), and at least a bottom wall 104 (see FIG. 7) in which a diode housing space 230 described later is formed and a resistance housing space 220 described later are formed. And a side wall (side portion) 106 (see FIG. 6) on the Z direction side.

  As illustrated in FIG. 6, the resistor 120 includes a resistor body 122 as an example of an electronic component body, and a pair of resistor terminals 124 </ b> A and 124 </ b> B extending from the resistor body 122. Specifically, one resistance terminal 124A extends from one end portion (upper end portion (Y direction end portion)) of the resistor main body 122 and is bent so as to extend in the −Z direction. The other resistance terminal 124B extends from the other end (lower end (−Y direction end)) of the resistor main body 122 and is bent so as to extend in the −Z direction.

  As shown in FIG. 7, the diode 130 includes a diode main body 132 as an example of an electronic component main body, and a pair of diode terminals 134 </ b> A and 134 </ b> B extending from the diode main body 132. Specifically, one diode terminal 134 </ b> A extends in the X direction from one end portion (X direction end portion) of the diode body 132. The other diode terminal 134B extends from the other end portion (−X direction end portion) of the diode body 132 in a direction opposite to the extending direction of the diode terminal 134A (−X direction).

  The circuit 110 includes a first conducting member 111 that conducts the introduction-side guide member 64, the diode terminal 134A of the diode 130, and the resistance terminal 124A of the resistor 120, and a second that conducts the diode terminal 134B of the diode 130 and the heating roll 70. The conductive member 112, and the third conductive member 113 that conducts the resistance terminal 124B of the resistor 120 and the image forming apparatus main body 11 (the main body frame of the image forming apparatus 10) are provided.

  As shown in FIG. 5, the first conducting member 111 has a fixed portion 111 </ b> A that is fixed to one end portion (Z-direction end portion) 64 </ b> C in the longitudinal direction of the introduction-side guide member 64. A through hole 111F is formed in the fixed portion 111A. Specifically, the fixed portion 111A is screwed by a screw 114 inserted through the through hole 111F and fixed to one end portion (Z direction end portion) 64C in the longitudinal direction of the introduction side guide member 64. Yes. Thereby, the first conduction member 111 is electrically connected to the introduction side guide member 64. The pressure belt 80 is supported by the introduction side guide member 64 via a pair of belt support plates 66 made of sheet metal, and is configured to have the same potential as the introduction side guide member 64. .

  As shown in FIG. 7, the fixed portion 111 </ b> A is formed with a sandwiching portion 111 </ b> B that sandwiches the resistance terminal 124 </ b> A of the resistor 120 with the fixed portion 111 </ b> A. Accordingly, in the first conductive member 111, the fixed portion 111A comes into contact with the resistance terminal 124A of the resistor 120 from below, and the washer 115 (see FIG. 5) provided on the screw 114 and the sandwiching portion 111B are connected. The resistor terminal 124A of the resistor 120 is in contact with the resistor terminal 124A from above, and the resistor terminal 124A of the resistor 120 is sandwiched from above and below.

  In addition, the first conduction member 111 has a contact portion 111 </ b> C that contacts the diode terminal 134 </ b> A of the diode 130. 111 C of contact parts are comprised by the leaf | plate spring extended below 111 A of to-be-fixed parts (-Y direction). The contact portion 111 </ b> C is electrically connected to the diode terminal 134 </ b> A of the diode 130 through the concave portion 111 </ b> D at the distal end portion in a state of being elastically deformed.

  As shown in FIGS. 7 and 8, the second conducting member 112 includes a contact portion 112A that contacts the diode terminal 134B of the diode 130, and a contact portion 112B that contacts the bearing 74 (see FIG. 5) of the heating roll 70. ,have. The contact portion 112A is electrically connected to the diode terminal 134B by sandwiching the diode terminal 134B from above and below by three contact pieces. The contact portion 112 </ b> B includes two contact pieces, and the two contact pieces are electrically connected to the bearing 74 by contacting the outer periphery of the bearing 74.

  As shown in FIG. 8, the third conducting member 113 is attached to the grounding device main body 102 by sandwiching the bottom wall 104 of the grounding device main body 102. The third conductive member 113 includes a contact portion 113A that contacts the resistance terminal 124B of the resistor 120 and a contact portion 113B that contacts the image forming apparatus main body 11 (the main body frame of the image forming apparatus 10).

  The contact portion 113A is electrically connected to the resistance terminal 124B by sandwiching the resistance terminal 124B of the resistor 120 from above and below by two contact pieces. The contact portion 113B is bent so as to be convex downward (−Y direction), and is in contact with the image forming apparatus main body 11 (the main body frame of the image forming apparatus 10) at the convex portion.

  As shown in FIG. 9, the third conductive member 113 sandwiches the bottom wall 62 </ b> A of the roll support 62 together with the bottom wall 104 of the grounding device main body 102 in a state in which the grounding device 100 is attached to the roll support 62. The contact portion 113B is exposed to the outside (lower side) of the roll support 62 (fixing device 60).

  Here, in this embodiment, as illustrated in FIGS. 6 and 9, the grounding device main body 102 includes a resistance accommodating space 220 as an example of an accommodating space for accommodating the resistor main body 122 of the resistor 120 and a pair of resistors 120. The resistor terminals 124A and 124B have a pair of resistor openings 224A and 224B as an example of openings that project out of the resistor accommodating space 220. The pair of resistance openings 224A and 224B are sized such that the pair of resistance terminals 124A and 124B of the resistor 120 can pass through and the resistor body 122 of the resistor 120 cannot pass through. Further, the grounding device main body 102 is formed with an accommodation port 228 through which the resistor 120 (resistance body 122) accommodated in the resistance accommodation space 220 passes. The accommodation port 228 faces the Z direction. Accordingly, the resistor 120 passes through the storage port 228 in the −Z direction and is stored in the resistance storage space 220.

  When the grounding device 100 is attached to the fixing device 60 (roll support body 62), the accommodation port 228 is closed by the roll support body 62 and the inner wall (side wall) of the cover 96, and the resistance accommodation space 220 is closed. It is comprised so that it may become space (refer FIG. 5).

  Further, as shown in FIGS. 5 and 9, holes 296 through which the resistance main body 122 accommodated in the resistance accommodating space 220 can be visually recognized are formed in the side walls of the roll support 62 and the cover 96. The hole 296 has such a size that the resistance main body 122 cannot pass therethrough. In addition, the notch which comprises the hole 296 is formed in the side wall of the cover 96, and the hole 296 is formed in the state in which the cover 96 is attached to the roll support body 62.

  Further, as shown in FIGS. 10 and 11, the grounding device body 102 includes a diode housing space 230 as an example of a housing space for housing the diode body 132 of the diode 130, and a pair of diode terminals 134 </ b> A and 134 </ b> B of the diode 130. And a pair of diode openings 234A and 234B as an example of an opening that protrudes out of the diode housing space 230.

  Specifically, as shown in FIG. 7, the diode opening 234A is configured by a groove opened upward (Y direction). As shown in FIG. 11, the diode opening 234 </ b> B is specifically configured by a groove opened downward (−Y direction). The pair of diode openings 234A and 234B are sized such that the pair of diode terminals 134A and 134B of the diode 130 can pass through and the diode body 132 of the diode 130 cannot pass through.

  As shown in FIGS. 10 and 11, the grounding device main body 102 is formed with an accommodation port 238 through which the diode 130 (diode body 132) accommodated in the diode accommodation space 230 passes. The storage port 238 faces a different direction (−Y direction) from the storage port 228. As a result, the diode 130 passes through the storage port 238 in the Y direction and is stored in the diode storage space 230. That is, in this embodiment, the accommodation directions of the resistor 120 and the diode 130 are different.

  The accommodation port 238 is closed by the inner wall (bottom wall 62A) of the roll support body 62 in a state in which the grounding device 100 is attached to the fixing device 60 (roll support body 62), and the diode accommodation space 230 is closed. It is comprised so that.

  Further, a hole 262 through which the diode main body 132 accommodated in the diode accommodating space 230 can be visually recognized is formed in the bottom wall 62 </ b> A of the roll support 62. The hole 262 is sized so that the diode body 132 cannot pass therethrough.

(Operation of this embodiment)
In the present embodiment, the introduction-side guide member 64 and the pressure belt 80 are attached to the image forming apparatus main body 11 (the main body frame of the image forming apparatus 10) via the first conductive member 111, the resistor 120, and the third conductive member 113. Grounded. On the other hand, the heating roll 70 is grounded to the image forming apparatus main body 11 (the main body frame of the image forming apparatus 10) via the second conductive member 112, the diode 130, the first conductive member 111, the resistor 120, and the third conductive member 113. Is done. For this reason, the introduction-side guide member 64, the pressure belt 80, and the heating roll 70 are maintained at a predetermined potential for each component. Thereby, even if the introduction-side guide member 64, the pressure belt 80, and the heating roll 70 come into contact with the charged toner image after the transfer and before the fixing, the image deterioration of the toner image is suppressed.

  Here, in the present embodiment, the pair of resistance openings 224A and 224B have such a size that the resistance main body 122 of the resistor 120 cannot pass through. For this reason, even when the attachment of the pair of resistance terminals 124A and 124B is removed due to an attachment failure of the resistor 120 or a component failure, the resistor 120 is restricted from coming out of the resistance accommodating space 220 through the pair of resistance openings 224A and 224B. The

  The pair of diode openings 234A and 234B are sized such that the diode body 132 of the diode 130 cannot pass therethrough. For this reason, even when the pair of diode terminals 134A and 134B is detached due to the attachment failure of the diode 130 or the parts failure, the diode 130 may come out of the diode housing space 230 through the pair of diode openings 234A and 234B. Be regulated.

  As a result, the resistor 120 and the diode 130 are restricted from coming out of the resistor accommodating space 220 and the diode accommodating space 230 and damaging the heating roll 70 and the pressure belt 80, respectively. Further, image degradation caused by damaging the heating roll 70 and the pressure belt 80 is also restricted.

  In the present embodiment, the accommodation direction of the resistor 120 with respect to the resistance accommodation space 220 (−Z direction) and the accommodation direction of the diode 130 with respect to the diode accommodation space 230 (Y direction) are different. Compared with the case where it is, the mistake of attachment of the resistor 120 and the diode 130 is suppressed.

  In the present embodiment, the storage port 228 is closed by the roll support 62 and the inner wall (side wall) of the cover 96 when the grounding device 100 is attached to the fixing device 60 (roll support 62). It is closed by the inner wall (bottom wall 62A) of the roll support 62. That is, the accommodation port 228 and the accommodation port 238 are closed by the work of attaching the grounding device 100 to the fixing device 60 (roll support body 62).

  Therefore, the work process is reduced as compared with a case where a dedicated work for closing the storage port 228 and the storage port 238 is required separately from the mounting operation. In addition, a dedicated component for closing the storage port 228 and the storage port 238 is not necessary, and the number of components is reduced.

  In the present embodiment, whether or not the resistance main body 122 is accommodated in the resistance accommodating space 220 is confirmed by visually recognizing the resistance main body 122 of the resistor 120 through the hole 296. The hole 296 has such a size that the resistance main body 122 cannot pass therethrough. For this reason, even when the pair of resistance terminals 124 </ b> A and 124 </ b> B is detached due to an attachment failure of the resistor 120 or a component failure, the resistor 120 is restricted from coming out of the resistance accommodation space 220 through the hole 296.

  In the present embodiment, whether or not the diode body 132 of the diode 130 is accommodated in the diode accommodation space 230 is confirmed through the hole 262. The hole 262 is sized so that the diode body 132 cannot pass therethrough. For this reason, even when the attachment of the pair of diode terminals 134A and 134B is removed due to an attachment failure of the diode 130 or a component failure, the diode 130 is restricted from coming out of the diode housing space 230 through the hole 262.

(Modification)
In the present embodiment, all of the heating roll 70, the pressure belt 80, and the introduction-side guide member 64 are grounded. However, it is sufficient that at least one of them is grounded.

  In this embodiment, the resistor 120 and the diode 130 are used as an example of a plurality of electronic components. However, as an example of a plurality of electronic components, only a plurality of diodes or a plurality of resistors may be used. . Furthermore, as an example of the electronic component, a single component may be used.

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made. For example, the modification examples described above may be appropriately combined.

10 Image forming apparatus 26 Transfer roll (an example of a transfer unit)
62 Roll support (an example of a fixing device main body)
64 Introduction side guide member (an example of a contact member, an example of a guide member)
70 Heating roll (an example of a contact member, an example of a heating member)
80 Pressure belt (an example of a contact member, an example of a pressure member)
DESCRIPTION OF SYMBOLS 100 Grounding device 102 Grounding device main body 110 Circuit 120 Resistance (an example of an electronic component)
122 Resistor body (an example of electronic component body)
124A resistance terminal (an example of a terminal)
124B resistor terminal (an example of terminal)
130 Diode (an example of an electronic component)
132 Diode body (an example of electronic component body)
134A Diode terminal (an example of a terminal)
134B Diode terminal (an example of a terminal)
220 Resistive accommodation space 224A Resistive opening 224B Resistive opening 228 Housing port 230 Diode housing space 234A Diode opening 234B Diode opening 238 Housing port 262 Hole 296 Hole P Recording medium

Claims (6)

A circuit for grounding a contact member that contacts a recording medium onto which an image has been transferred to a reference potential;
An electronic component provided in the circuit and having an electronic component body and a terminal;
A grounding device body having a housing space for housing the electronic component body;
An opening formed in the grounding device main body, projecting the terminal out of the housing space, and having a size through which the electronic component main body cannot pass;
A grounding device comprising: A plurality of the electronic components are provided,
The grounding device body includes a plurality of housing spaces that house the electronic component bodies of the electronic components, and a plurality of housing ports through which the electronic component bodies housed in the housing spaces pass. And
The grounding device according to claim 1, wherein the plurality of receiving ports face different directions. A fixing device body;
A heating member provided in the fixing device main body for heating the recording medium on which the image is transferred;
A pressure member provided in the fixing device main body so as to be in pressure contact with the heating member, and pressurizing the recording medium;
A guide member provided in the fixing device main body for guiding the recording medium between the heating member and the pressure member;
The grounding device according to claim 1, wherein the grounding device is attached to the fixing device main body and grounds at least one of the heating member, the pressure member, and the guide member to a reference potential.
A fixing device.   The grounding device has a housing port through which the electronic component body housed in the housing space passes is formed in the grounding device body, and the housing port is attached to the fixing device body. The fixing device according to claim 3, which is closed by an inner wall of the fixing device. In the fixing device main body,
The electronic component main body has a size that is not allowed to pass therethrough, and a hole through which the electronic component main body accommodated in the accommodation space can be visually recognized.
The fixing device according to claim 4, wherein the fixing device is formed. A transfer section for transferring an image to a recording medium;
The fixing device according to claim 4 or 5, wherein the image transferred by the transfer unit is fixed to the recording medium.
An image forming apparatus comprising:

Images