JP6127632B2 - Rotating device, guide device, image forming device - Google Patents

Description

  The present invention relates to a rotating device, a guide device, and an image forming apparatus.

  In Patent Document 1, a cleaning blade that is supported by a support plate and removes the developer attached to the surface of the photosensitive drum, and a fixing point at which the support plate is fixed to the housing are opposite to the photosensitive drum. An image forming apparatus including a toner seal member sandwiched between the support plate and the housing is disclosed.

JP-A-3-101783

  It is an object of the present invention to suppress leakage of the deposit from the housing portion that accommodates the deposit scraped off by the scraping member while suppressing the influence of the scraping member that scrapes off the deposit on the rotating body. To do.

According to the first aspect of the present invention, there is provided a rotating body that adheres to an outer peripheral surface and rotates, a scraping member that contacts the rotating body and scrapes the deposit from the rotating body, and the scraping member scrapes off the rotating body. A storage unit that stores the attached matter, a support unit that is provided outside the storage unit, supports the scraping member, and contacts the storage unit and the support unit without contacting the scraping member, A sealing member that seals between the housing portion and the support portion with respect to the attached matter, and the support portion receives a load around its own support shaft so that the scraping member is moved to the rotating body. The sealing member is formed into a sheet shape when viewed along the axial direction of the rotating body, and one end portion in the intersecting direction intersecting the thickness direction is fixed to the housing portion, The load acts from the outside in the radial direction of the support shaft toward the support shaft. Sea urchin, the other end of the cross direction is in contact with the support portion in a state away from the receiving portion.

  The invention according to claim 3 is the guiding device as the rotating device according to claim 1 or 2, wherein the rotating body guides the recording medium, and unfixed toner of the recording medium adheres to the rotating body as an adhering matter. .

  According to a fourth aspect of the present invention, there is provided a forming unit for forming a toner image on a recording medium, the guiding device according to the third aspect in which the rotating body guides the recording medium, and an undetermined recording medium guided by the guiding device. And an image forming apparatus including a fixing unit that fixes the contact toner.

  According to the structure of Claim 1 of this invention, compared with the case where a sealing member contacts a scraping member, the leakage of the deposit | attachment from an accommodating part can be suppressed, suppressing the influence on the load with respect to the rotary body of a scraping member. .

According to the configuration of the first aspect of the present invention, compared with the case where the load on the support portion of the sealing member acts in the rotation direction of the support portion, while suppressing the influence of the scraping member on the load on the rotating body, Leakage of deposits can be suppressed.

  According to the configuration of the third aspect of the present invention, it is possible to suppress toner leakage from the storage portion while suppressing toner scraping failure due to the influence of the scraping member on the load on the rotating body.

According to the configuration of the fifth aspect of the present invention, it is possible to suppress the image deterioration caused by the reattachment of the toner to the recording medium due to the toner scraping failure of the scraping member as compared with the case where the guide device in the present configuration is not provided.

1 is a schematic diagram illustrating a configuration of an image forming apparatus according to an exemplary embodiment. It is a sectional side view which shows the structure of the roller unit which concerns on this embodiment. It is a perspective view which shows the structure of the roller unit which concerns on this embodiment. It is a sectional side view which shows the structure of the roller unit which concerns on a comparative example. It is a sectional side view which shows the structure of the roller unit which concerns on a modification.

  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.

  The image forming apparatus 10 is an electrophotographic image forming apparatus that forms images on both sides of a continuous paper P (an example of a recording medium) that is long in the transport direction. As shown in FIG. 1, the image forming apparatus 10 includes an apparatus housing 11 in which each component is housed.

  A first storage unit 12 in which the continuous paper P is stored is provided outside the apparatus housing 11. Inside the apparatus housing 11 are a front surface image forming unit 14 (an example of a forming unit) that forms a toner image on the front surface PF (one surface) of the continuous paper P, and a rear surface PR (the other side) of the continuous paper P. A back surface image forming section 15 (an example of a forming section) for forming a toner image on the front surface) and a transport section 16 for transporting the continuous paper P from the first storage section 12 to the front surface image forming section 14. It has been. Further, inside the apparatus housing 11, a front surface fixing device 50 (an example of a fixing unit) that fixes a toner image formed on the front surface PF of the continuous paper P and a back surface PR of the continuous paper P are formed. A back surface fixing device 52 (an example of a fixing unit) that fixes the toner image and a second storage unit 18 that stores the continuous paper P on which the toner image is fixed on both sides are provided.

  The first storage unit 12 stores the continuous paper P in a folded state. The continuous paper P stored in the first storage unit 12 is sent into the apparatus casing 11 through the opening 11 </ b> A of the apparatus casing 11. Note that a plurality of feed holes are formed along the transport direction at both ends of the continuous paper P in the width direction (the front-back direction of the paper surface in FIG. 1).

  Each of the front-side image forming unit 14 and the back-side image forming unit 15 includes a photosensitive drum 32 as an image holding body that holds an image. The photosensitive drum 32 is configured to rotate in one direction (the arrow direction in FIG. 1). Around the photosensitive drum 32, the charging device 23 for charging the photosensitive drum 32 and the photosensitive drum 32 charged by the charging device 23 are exposed in order from the upstream side in the rotation direction of the photosensitive drum 32 to expose the photosensitive drum. 32, an exposure device 36 for forming an electrostatic latent image, a developing device 38 for developing the electrostatic latent image formed on the photosensitive drum 32 by the exposure device 36 to form a toner image, and a photosensitive member by the developing device 38. A transfer unit 26 for transferring the toner image formed on the drum 32 to the continuous paper P and a cleaning roll 37 as a removing member for removing the toner remaining on the photosensitive drum 32 are provided.

  The exposure device 36 forms an electrostatic latent image based on an image signal sent from a control unit (not shown). As an image signal sent from a control unit (not shown), for example, there is an image signal acquired from an external device by a control unit (not shown).

  The transfer unit 26 faces the photoconductive drum 32, and a transfer position T between the transfer unit 26 and the photoconductive drum 32 at which the toner image formed on the photoconductive drum 32 is transferred to the continuous paper P. It is said that.

  The transport unit 16 has a transport belt having pins formed on the outer periphery, and includes a plurality of transport bodies 48 that transport the continuous paper P by inserting the pins into the feed holes of the continuous paper P. The front surface fixing device 50 and the back surface fixing device 52 irradiate flash paper (flash light) from the light emitting unit 53 (flash lamp) onto the continuous paper P, thereby melting the toner on the continuous paper P and forming a toner image. It is fixed to the continuous paper P.

  On the downstream side in the conveyance direction of the fixing device 52 for the back surface, a swinging member 56 is provided that accommodates the second storage unit 18 while folding the continuous paper P to which the toner image has been fixed. Yes. In the present embodiment, a plurality of rolls 46 that guide the continuous paper P downstream in the transport direction or transport the continuous paper P downstream in the transport direction are provided along the transport path of the continuous paper P. ing.

  Further, on the downstream side in the transport direction of the transfer position T of the front surface image forming unit 14 and on the upstream side of the transport position of the fixing position of the front surface fixing device 50, the continuous form is in contact with the surface PF of the continuous paper P. A roller unit 59 (an example of a rotating device (guide device)) that guides the paper P downstream in the transport direction is provided. Specifically, the roller unit 59 is disposed downstream of the transfer position T of the front surface image forming unit 14 in the transport direction and upstream of the transfer position T of the back surface image forming unit 15.

  Further, on the downstream side in the transport direction of the transfer position T of the back surface image forming unit 15 and upstream in the transport direction of the fixing position of the back surface fixing device 52, the back surface PR of the continuous paper P is brought into contact with the back surface PR. A roller unit 60 (an example of a rotating device (guide device)) that guides the paper P downstream in the transport direction is provided. Specifically, the roller unit 60 is disposed downstream of the transfer position T of the back surface image forming unit 15 in the transport direction and upstream of the fixing position of the front surface fixing device 50 in the transport direction. Note that specific configurations of the roller unit 60 and the roller unit 59 will be described later.

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

  In the image forming apparatus 10, the continuous paper P stored in the first storage unit 12 is transported by the transport unit 16 and sent to the transfer position T of the front surface image forming unit 14.

  On the other hand, in the surface image forming unit 14, the photosensitive drum 32 is charged by the charging device 23 and then exposed by the exposure device 36, and 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 toner image on the photosensitive drum 32. This toner image is transferred to the surface PF of the continuous paper P at the transfer position T by the transfer unit 26.

  The continuous paper P on which the toner image is transferred to the front surface PF is further fed to the transfer position T of the back surface image forming unit 15. In the back surface image forming unit 15, similarly to the front surface image forming unit 14, a toner image is formed on the photosensitive drum 32, and this toner image is transferred to the back surface PR of the continuous paper P at the transfer position T by the transfer unit 26. Is transferred to. In this way, the toner image is transferred to both surfaces (front surface PF and back surface PR) of the continuous paper P.

  The continuous paper P on which the toner images are transferred on both sides (the front surface PF and the back surface PR) is conveyed to the front surface fixing device 50, and the toner image transferred to the front surface PF of the continuous paper P is transferred by the front surface fixing device 50. It is fixed. Further, the continuous paper P to which the toner image on the front surface PF is fixed is conveyed to the back surface fixing device 52, and the toner image transferred to the back surface PR of the continuous paper P is fixed by the back surface fixing device 52. In this way, the toner images are fixed on both surfaces (front surface PF and back surface PR) of the continuous paper P.

  The continuous paper P on which the toner images on both sides are fixed is accommodated in the second accommodating portion 18 while being folded by the swing member 56. As described above, a series of image forming operations are performed.

(Configuration of roller unit 60)
Next, the configuration of the roller unit 60 (an example of a rotating device (guide device)) according to the present embodiment will be described. 2 and 3 are diagrams showing the configuration of the roller unit 60 according to the present embodiment. Since the roller unit 59 is configured in the same manner as the roller unit 60, description thereof will be omitted as appropriate.

  As shown in FIG. 2, the roller unit 60 serves as a guide roller 62 that guides the continuous paper P (an example of a rotating body) and a removal member that removes toner (an example of an adhering matter) attached to the guide roller 62. A cleaning brush 63 and a blade 64 (an example of a scraping member) that contacts the guide roller 62 and scrapes off toner (an example of an adhering matter) from the guide roller 62. Further, the roller unit 60 includes a storage unit 70 that stores toner scraped off by the blade 64, and a support unit 68 that is provided outside the storage unit 70 and supports the blade 64.

  As shown in FIG. 3, the guide roller 62 is rotatably supported by a pair of frames 76 described later. One end of the guide roller 62 in the axial direction is provided with a gear 62A as a transmission portion. The guide roller 62 is driven to rotate in one direction (clockwise direction in FIG. 2) as shown in FIG. 2 as a driving force from a drive unit (not shown) is transmitted through the gear 62A. ing. As the rotationally driven guide roller 62 comes into contact with the back surface PR of the continuous paper P, the guide roller 62 regulates the transport direction (transport path) of the continuous paper P and feeds the continuous paper downstream in the transport direction. Guide P. Since the guide roller 62 is driven to rotate, rubbing between the guide roller 62 and the continuous paper P is suppressed as compared with the case where the guide roller 62 does not rotate or the guide roller 62 is driven.

  Since the surface (outer peripheral surface) of the guide roller 62 is in contact with the back surface PR of the continuous paper P on which the toner is not fixed, the guide roller 62 is prevented from adhering unfixed toner to the surface of the guide roller 62. The surface layer 62 is made of a material having good releasability. However, since a small amount of unfixed toner adheres to the surface of the guide roller 62, in this embodiment, the toner attached to the guide roller 62 is removed by the cleaning brush 63 and the blade 64. The guide roller 62 in the roller unit 59 is in contact with the surface PF of the continuous paper P.

  As shown in FIG. 2, the cleaning brush 63 includes a shaft portion 63A rotatably supported by a pair of frames 76 (see FIG. 3) described later, a brush portion 63B provided on the outer periphery of the shaft portion 63A, have. The cleaning brush 63 is arranged so that the tip of the brush portion 63B contacts the surface of the guide roller 62. As shown in FIG. 3, a gear 63 </ b> C as a transmission portion is provided at one axial end portion of the shaft portion 63 </ b> A. In the cleaning brush 63, a driving force from a driving portion (not shown) is transmitted to the shaft portion 63A via the gear 63C, and as shown in FIG. 2, the direction opposite to the guide roller 62 (counterclockwise in FIG. 2). Direction). As a result, the toner on the guide roller 62 is scraped off by the brush portion 63B of the cleaning brush 63 and is attracted to the brush portion 63B. The toner adsorbed on the brush part 63B of the cleaning brush 63 is brought into contact with the dropping part 67 of the dropping member 66 and dropped.

  The blade 64 is made of a rubber material such as urethane, for example, and is formed in a rectangular shape in a side view (side sectional view) as shown in FIG. The blade 64 is attached to the attachment portion 68B so as to protrude from the tip of the attachment portion 68B of the support portion 68, and the corner portion 64A (edge) is in contact with the surface of the guide roller 62. Specifically, the corner portion 64A is pressed against the surface of the guide roller 62 with a predetermined load, as will be described later. As a result, when the guide roller 62 rotates, the toner adhering to the surface of the guide roller 62 is scraped off by the corner portion 64A.

  The thickness and length of the blade 64, the amount of biting into the guide roller 62, and the amount of protrusion (free length) by which the blade 64 protrudes from the tip of the mounting portion 68 </ b> B of the support portion 68 are the loads on the guide roller 62 of the blade 64. These are the setting conditions for setting, and these setting conditions are determined in advance so that the required load can be obtained. Note that the biting amount is the distance between the corner 64 </ b> A that enters the inside of the virtual line on the outer periphery of the guide roller 62 and the virtual line when the guide roller 62 is not present (the distance in the radial direction of the guide roller 62). It is.

  The housing part 70 is provided on both ends of the guide roller 62 in the axial direction of the U-shaped housing 74 opened upward, the upper wall part 72 formed integrally with the dropping part 67, and the guide roller 62 in a side sectional view. And a pair of frames 76 (see FIG. 3).

  The housing 74 has a side wall 74A opposed to the cleaning brush 63 in the radial direction, and extends obliquely downward from a lower end of the side wall 74A toward the conveying member 78 described later and curves along a part of the outer periphery of the conveying member 78 described later. And a slant wall 74C extending obliquely upward from the front end (left end in FIG. 2) of the bottom wall 74B to the guide roller 62 side.

  Between the front end portion (left end portion in FIG. 2) of the inclined wall 74C of the housing 74 and the front end portion (left end portion in FIG. 2) of the upper wall portion 72 is an opening portion (two-dot chain line S) of the housing portion 70. Has been. A guide roller 62 and a blade 64 are disposed in the opening.

  The upper wall portion 72 is connected to the dropping portion 67 by an L-shaped connecting portion 75 in a side sectional view (side view). That is, the drop member 66 is configured by the upper wall portion 72, the drop portion 67, and the connecting portion 75. The connecting portion 75 is a vertical portion 75A that forms an L-shaped long side portion and extends in the vertical direction (vertical direction), and is fixed to the surface of the side wall 74A of the housing 74 on the cleaning brush 63 side.

  A sealing member 65 that seals between the guide roller 62 and the tip of the upper wall 72 is provided at the tip of the upper wall 72 (the left end in FIG. 2).

  A conveying member 78 that conveys the toner accommodated in the accommodating portion 70 is provided below the dropping portion 67 in the accommodating portion 70. Specifically, the conveying member 78 is rotated by a driving force from a driving unit (not shown), thereby conveying the toner along the axial direction of the guide roller 62 (cleaning brush 63) and discharging the toner. (Not shown).

  The support portion 68 that supports the blade 64 includes a support portion main body 68A that extends obliquely upward along the inclined wall 74C, a mounting portion 68B that extends obliquely upward from the upper end portion of the support portion main body 68A toward the cleaning brush 63, and a support portion. And an extending portion 68C extending obliquely upward to the right from the lower end portion of the main body 68A. The support portion 68 is supported by a pair of frames 76 (see FIG. 3) so as to be rotatable around an axis along the axial direction of the guide roller 62 by a support shaft 69 provided on the support portion main body 68A.

  A blade 64 is attached to the surface of the attachment portion 68B of the support portion 68 on the guide roller 62 side (left side in FIG. 2). The support portion 68 is urged (pressed) in the direction of the arrow A1 by an urging member (not shown), so that the blade 64 is urged in the direction of the arrow A2 (the direction around the support shaft 69). ing. By this urging force and the elastic force of the blade 64 itself, the corner portion 64A of the blade 64 is pressed against the guide roller 62 with a predetermined load.

  The blade 64 and the support portion 68 are separated from the tip end portion (upper end portion) of the inclined wall 74C toward the conveyance path side (guide roller 62 side) of the continuous paper P, and the blade 64 and the support portion 68 are separated from each other. A gap H is formed between the tip (upper end) of the inclined wall 74C.

  Here, the roller unit 60 includes a seal sheet 80 (an example of a sealing member) that seals between the storage unit 70 and the support unit 68 with respect to the toner stored in the storage unit 70.

  The seal sheet 80 is configured to be bent and is formed in a letter shape (V shape) in a side view. A short side portion 80 </ b> A having a short side in a side view in the seal sheet 80 is attached to the extending portion 68 </ b> C of the support portion 68. A long side portion 80B having a long side in a side view in the seal sheet 80 is disposed from the end portion on the support portion main body 68A side of the short side portion 80A toward the inclined wall 74C and is in contact with the inclined wall 74C. That is, the seal sheet 80 comes into contact with the accommodating portion 70 (slanted wall 74 </ b> C) and the support portion 68 without contacting the blade 64.

  In the no-load state, the long side portion 80B is positioned at a position indicated by a two-dot chain line in the seal sheet 80, and the long side portion 80B of the seal sheet 80 is preliminarily formed by the elastic force of the seal sheet 80. It is pressed against the outer surface of the inclined wall 74C with a predetermined load.

  A space K (a space between the inclined wall 74C and the support portion main body 68A) that communicates with the internal space of the housing portion 70 through a gap H between the blade 64 (the attachment portion 68B of the support portion 68) and the tip portion of the inclined wall 74C. ) Becomes a space sealed (closed) by the seal sheet 80. The space K is closed by frame 76 at both ends along the axial direction of the guide roller 62.

  As the seal sheet 80, for example, polyurethane having a Young's modulus of 6000 to 20000 MPa is used. In addition, the seal sheet 80 is set to have a free length of 18 to 32 mm, a thickness of 0.08 to 0.2 mm, and a biting amount of 2.0 to 4.0 mm, for example. The free length is the length of the portion that is not attached to the support portion 68 of the seal sheet 80, and specifically the length of the long side portion 80B. The amount of biting is the distance between the tips of the seal sheet 80 at the unloaded position and at the loaded position. Accordingly, this corresponds to the distance between the tips of the seal sheet 80 at the position indicated by the two-dot chain line in FIG. 2 and the position indicated by the solid line.

  The support 68 is pushed in the direction of the arrow B1 by the reaction force of the load on the inclined wall 74C of the seal sheet 80. As a result, an external force in the direction in which the blade 64 moves away from the guide roller 62 (direction B2 opposite to the arrow A2 direction) acts on the blade 64. For this reason, the load (arrow A2) of the blade 64 on the guide roller 62 is set in consideration of the load (arrow B2) by the seal sheet 80.

(Operation of this embodiment)
In the present embodiment, the surface of the rotationally driven guide roller 62 contacts the continuous paper P, and the continuous paper P is guided downstream in the transport direction. When the guide roller 62 contacts the continuous paper P, unfixed toner on the continuous paper P adheres to the surface of the guide roller 62. The toner adhering to the surface of the guide roller 62 is scraped off by the cleaning brush 63 and is attracted to the cleaning brush 63. The toner adsorbed on the cleaning brush 63 is removed by the dropping unit 67. Further, the toner adhering to the surface of the guide roller 62 is scraped off by the blade 64.

  The toner dropped by the drop unit 67 and the toner scraped off by the blade 64 are stored in the storage unit 70. The toner stored in the storage unit 70 is transported by a transport member 78 to a discharge unit (not shown).

Then, the seal sheet 80 seals between the storage unit 70 and the support unit 68 with respect to the toner stored in the storage unit 70. Specifically, the seal sheet 80 has a space K (an inclined wall 74C) that communicates with the internal space of the accommodating portion 70 through a gap H between the blade 64 (the attachment portion 68B of the support portion 68) and the distal end portion of the inclined wall 74C. And the space between the support portion main body 68A) is a closed space.
For this reason, even when the toner accommodated in the accommodating portion 70 passes through the gap H between the blade 64 (the attachment portion 68B of the support portion 68) and the tip end portion of the inclined wall 74C, the toner is moved to the outside in the closed space K. Is prevented from leaking.

  In the present embodiment, the seal sheet 80 comes into contact with the housing portion 70 and the support portion 68 to seal between the housing portion 70 and the support portion 68. That is, the seal sheet 80 does not contact the blade 64. Therefore, compared to the comparative example (see FIG. 4) in which the seal sheet 80 is in contact with the blade 64, as described later, the leakage of toner is suppressed as described above while suppressing the influence of the blade 64 on the load on the guide roller 62. It is suppressed.

  Here, as described above, the protrusion amount (free length) of the blade 64 protruding from the attachment portion 68B of the support portion 68 is determined in advance. Further, since the blade 64 is elastically deformed, the back surface 64B side (the surface attached to the attachment portion 68B of the support portion 68) of the blade 64 is deformed into a concave shape. Changes over time.

  For this reason, in the comparative example (see FIG. 4) in which the seal sheet 80 contacts the blade 64, the contact area with the blade 64 is limited, and the allowable range of conditions such as the contact position and the contact angle (direction / orientation) is narrow. That is, the load (arrow C) on the blade 64 of the seal sheet 80 varies due to the mounting error or dimensional error of the seal sheet 80. Therefore, it is difficult to set the load (arrow A1 and arrow A2) of the blade 64 on the guide roller 62 in consideration of the load on the blade 64 of the seal sheet 80 (arrow C).

  In the comparative example, the load (arrow C) of the seal sheet 80 on the blade 64 is not affected by the load (arrow C) of the seal sheet 80 on the load (arrow A2) of the blade 64 on the guide roller 62. In the case of decreasing the toner size, a vibration may be generated between the seal sheet 80 and the blade 64 due to vibrations from the driving unit or the like, and the toner may leak (see broken line arrows in FIG. 4). Further, due to a dimensional error of the seal sheet 80, for example, when the seal sheet 80 is slightly short, a gap is formed between the seal sheet 80 and the blade 64, or when the seal sheet 80 is slightly long, The leading end of the sheet 80 may be rounded and lifted from the blade 64, and toner may leak from between the seal sheet 80 and the blade 64.

  In addition, as the seal sheet 80 according to the comparative example, for example, polyurethane having a Young's modulus of 4 to 7 MPa is used. Moreover, as the seal sheet 80 according to the comparative example, for example, the free length is set to 6.2 to 6.6 mm, the thickness is set to 0.15 to 0.25 mm, and the biting amount is set to 1.0 to 2.0 mm. . The free length is the length of the portion of the seal sheet 80 that is not attached to the housing 74. The amount of biting is the distance between the tips of the seal sheet 80 at the unloaded position and at the loaded position. Accordingly, this corresponds to the distance between the tips of the seal sheet 80 at the position indicated by the two-dot chain line in FIG. 4 and the position indicated by the solid line.

  On the other hand, in the configuration of the present embodiment, the seal sheet 80 is in contact with the accommodating portion 70 and the support portion 68, so that the contact position and the contact angle ( Wide allowable range of conditions such as (direction and orientation). That is, in this embodiment, even if the load (arrow B2) on the blade 64 via the support portion 68 of the seal sheet 80 varies due to the mounting error or dimensional error of the seal sheet 80, the variation in the load (arrow B2) is not. small. Therefore, it is easy to set the load (arrow A2) of the blade 64 on the guide roller 62 in consideration of the load (arrow B2) on the blade 64 via the support portion 68 of the seal sheet 80.

  Thus, in this embodiment, since the variation in the load (arrow B2) on the blade 64 via the support portion 68 of the seal sheet 80 is small, the load (arrow B1) on the support portion 68 of the seal sheet 80 is set large. However, the influence of the blade 64 on the load on the guide roller 62 (arrow A2) is small. If the load (arrow B1) on the support portion 68 of the seal sheet 80 is set large, a gap is hardly formed between the seal sheet 80 and the blade 64, and toner leakage is suppressed.

  In the present embodiment, the direction in which the elastic force of the blade 64 acts (direction of arrow A2) and the direction in which the elastic force of the seal sheet 80 acts (direction of arrow B2) are opposite directions. Even when the elastic force (that is, the force acting on the arrow A2) of the blade 64 is weakened due to the temporal deformation (plastic deformation), the seal sheet 80 also undergoes temporal deformation (plastic deformation), and the seal sheet 80 Decreasing the load on the guide roller 62 (arrow A2) by the blade 64 is suppressed by the weakening of the elastic force (that is, the force acting on the arrow B2).

(Modification of seal sheet 80)
As shown in FIG. 5, a seal sheet 180 may be used instead of the seal sheet 80. One end of the seal sheet 180 is attached (fixed) to a curved portion of the lower wall 74 </ b> B of the housing 74. The other end portion of the seal sheet 180 is in contact with the support portion 68 so that a load on the support portion 68 acts from the radially outer side of the support shaft 69 toward the support shaft 69. Thus, the seal sheet 180 seals the space between the storage unit 70 and the support unit 68 with respect to the toner stored in the storage unit 70. Similar to the seal sheet 80, the seal sheet 180 is not in contact with the blade 64.

  Similarly to the seal sheet 80, for example, polyurethane having a Young's modulus of 6000 to 20000 MPa is used for the seal sheet 180 of the modification. In addition, the seal sheet 180 is set to have a free length of 20 mm, a thickness of 0.08 to 0.2 mm, and a biting amount of 3.0 to 6.0 mm, for example. The free length is the length of the portion of the seal sheet 180 that is not attached to the housing 74. The amount of biting is the distance between the tips of the seal sheet 180 in the unloaded state and in the loaded state. Therefore, it corresponds to the distance between the tips of the seal sheet 180 at the position indicated by the two-dot chain line in FIG. 5 and the position indicated by the solid line.

  According to this configuration, the load on the support portion 68 of the seal sheet 180 acts from the radially outer side of the support shaft 69 of the support portion 68 toward the support shaft 69. That is, the load on the support portion 68 of the seal sheet 180 does not act in the rotation direction of the support portion 68 (no moment is generated). For this reason, the load by the seal sheet 180 (elastic force of the seal sheet 180) does not affect the load on the guide roller 62 of the blade 64.

  Thus, since the load on the guide roller 62 of the blade 64 is not affected, even if the load on the blade 64 of the seal sheet 180 is increased, the load on the guide roller 62 of the blade 64 does not change. By setting a large load on the blade 64 of the seal sheet 180, it is difficult to form a gap between the seal sheet 80 and the blade 64, and toner leakage is suppressed.

(Other variations)
In the above embodiment, the support portion 68 is rotatable. However, the present invention is not limited to this, and for example, the support portion 68 may be fixed without rotating.

  In the above-described embodiment, an example in which the guide roller 62 is used as an example of the rotating body has been described. However, the rotating body is not limited to the guide roller 62 and may be, for example, a photosensitive drum, a charging roll, or a transfer roll. The rotating body may be any rotating body to which deposits such as toner can adhere.

  Further, the adhering matter adhering to the rotating body is not limited to toner, and may be, for example, dust or any adhering matter that needs to be removed.

  Further, the position where the seal sheet 80 and the seal sheet 180 are in contact with the support portion 68 and the storage portion 70 and the direction of contact are not limited to the above-described configuration, and the support portion 68 and the storage portion are not in contact with the blade 64. If it contacts 70, it can be set to an arbitrary position and an arbitrary orientation.

  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.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 14 Image forming part for surfaces (an example of a formation part)
15 Back side image forming unit (an example of a forming unit)
50 Surface fixing device (an example of a fixing unit)
52 Back surface fixing device (an example of a fixing unit)
59 Roller unit (an example of a rotating device, an example of a guide device)
60 roller unit (an example of a rotating device, an example of a guide device)
62 Guide roller (an example of a rotating body)
64 blade (an example of a scraping member)
68 support part 69 support shaft 70 accommodating part 80 seal sheet (an example of a sealing member)
180 Seal sheet (an example of a sealing member)

Claims (5)

A rotating body that adheres to the outer peripheral surface and rotates,
A scraping member that contacts the rotating body and scrapes the deposit from the rotating body;
An accommodating portion for accommodating the deposits scraped off by the scraping member;
A support portion provided outside the housing portion and supporting the scraping member;
A sealing member that is in contact with the housing and the support without contacting the scraping member and seals between the housing and the support against the deposit;
With
The support portion receives a load around its own spindle and presses the scraping member against the rotating body,
The sealing member is
Looking along the axial direction of the rotating body, it is in the form of a sheet, and one end portion in the intersecting direction intersecting the thickness direction is fixed to the accommodating portion,
The other end portion in the crossing direction is in contact with the support portion in a state where the other end portion in the intersecting direction is separated from the housing portion so that a load on the support portion acts from the radially outer side of the support shaft of the support portion toward the support shaft. and it is rotating device. A rotating body that adheres to the outer peripheral surface and rotates,
A scraping member that contacts the rotating body and scrapes the deposit from the rotating body;
An accommodating portion for accommodating the deposits scraped off by the scraping member;
A support portion provided outside the housing portion and supporting the scraping member;
A sealing member that is in contact with the housing and the support without contacting the scraping member and seals between the housing and the support against the deposit;
With
The support portion receives a load in one direction around its own support shaft and presses the scraping member against the rotating body,
The said sealing member is contacting the said accommodating part and the said support part so that the load with respect to the said support part may act to the reverse direction to the said one direction around the spindle of the said support part.   The guide device as a rotating device according to claim 1, wherein the rotating body guides the recording medium, and unfixed toner on the recording medium adheres to the rotating body as a deposit.   A rotating body that adheres to the outer peripheral surface and rotates,
  A scraping member that contacts the rotating body and scrapes the deposit from the rotating body;
  An accommodating portion for accommodating the deposits scraped off by the scraping member;
  A support portion provided outside the housing portion and supporting the scraping member;
  A sealing member that is in contact with the housing and the support without contacting the scraping member and seals between the housing and the support against the deposit;
  With
  The support portion receives a load around its own spindle and presses the scraping member against the rotating body,
  The sealing member is in contact with the support portion such that a load on the support portion acts toward the support shaft from a radially outer side of the support shaft of the support portion,
  The rotating body guides the recording medium, and unfixed toner on the recording medium adheres to the rotating body as a deposit.
  Guide device.   A forming unit for forming a toner image on a recording medium;
  The guide device according to claim 3 or 4, wherein the rotating body guides the recording medium;
  A fixing unit for fixing unfixed toner on the recording medium guided by the guide device;
  An image forming apparatus comprising:

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