Kyocera Document Solutions Patente

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An image forming apparatus 1 includes a fixing unit 97 arranged in an apparatus main body 2 and adapted to perform a fixing process to fix an image to a recording sheet by heat, a first conveyance path 28, 961 for conveying the recording sheet via an image forming unit 93 and the fixing unit 97, a second conveyance path 29 for conveying the recording sheet having the fixing process performed thereon to an upstream side of the image forming unit 93 in the case of performing the image forming process on both sides of the recording sheet, a first cover 30 openably and closably attached to the apparatus main body 2, a second cover 50 for covering the second conveyance path 29, the second cover 50 being openably and closably attached to the apparatus main body 2 and openable and closable when the first cover 30 is in an open state, and fans 523 provided on the second cover 50 for supplying air streams to the second conveyance path 29.

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A fixing device (12) includes a fixing member, a pressure member (32), and a separating unit (35). The pressure member (32) is rotatably located and in a pressure contact with the fixing member to form a fixing nip (N). The separating unit (35) is configured to separate a sheet (S) from the fixing member. The sheet (S) is attached on the fixing member when passing through the fixing nip (N). The separating unit (35) includes a sliding member (40), a claw member (41), and a turning mechanism (42). The sliding member (40) is located in a state of contacting a surface of the fixing member. The claw member (41) runs toward the fixing nip (N) from the sliding member (40). The claw member (41) has a distal end portion. The claw member (41) is located in a state where the distal end portion contacts the surface of the fixing member. The turning mechanism (42) reciprocates the sliding member (40) and the claw member (41) along a rotation direction of the fixing member.

A fixing device (13) includes a cylindrical heat roller (31), a heating element (32) provided inside the heat roller (31) and configured to apply heat to the heat roller (31), a pressure roller (33) configured to be pressed against the heat roller (31) to form, with the heat roller (31), a nip area (N) where a recording paper sheet (P) is to be nipped, and an auxiliary roller (34) provided inside the heat roller (31) and configured to be pressed toward the pressure roller (33) with a peripheral wall of the heat roller (31) in between. An outer peripheral surface of the auxiliary roller (34) pressed against an inner peripheral surface of the heat roller (31) is formed into an inverted crown shape so that an outside diameter of the auxiliary roller (34) gradually decreases from both axial ends of the auxiliary roller (34) toward an axial center thereof.

A cleaning device (19) has housing (40), cleaning member (43), pair of bearing portions (53), toner receiving seal (50), and end seal (51). The housing (40) is formed with opening (40a) and waste toner retaining portion (40b). The cleaning member (43) is rotatably borne by the pair of bearing portions (53) at both ends of rotation axis. The toner receiving seal (50) is disposed facing to entire area in the longitudinal direction of the cleaning member (43), and extends to be laid across each end portion of the cleaning member and outer periphery of the bearing portion (53). The bearing portion (53) has the same outer diameter in a contact portion (55) where the toner receiving seal (50) contacts, as outer diameter of the cleaning member (43). The end seal (51) is disposed, in a gap between the housing (40) and each of the bearing portions (53), facing to the contact portion (55) with the toner receiving seal (50) interposed therebetween, and prevents leakage of waste toner from both end portions of the housing. (40)

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An image forming apparatus (10) includes a fixing part (26), a first conveying part (35), a second conveying part (37), a biasing member (64) and a separation supporting mechanism (62). The first conveying part (35) following the fixing part (26) includes rollers (35A, 35B) to convey a sheet at second linear velocity (V2) faster than first linear velocity (V1) of the fixing part (26). The second conveying part (37) following the first conveying part (35) conveys the sheet at third linear velocity (V3) faster than the first linear velocity (V1) near a heating rotation body (26A) of the fixing part (26) from a first reference line (L5) passing through nip parts (26C, 35C) of the fixing part (26) and first conveying part (35). The separation supporting mechanism (62) supports one roller (35A) in a direction separating from another roller (35B) and receives force from the sheet in the separating direction to the one roller (35A) when the second conveying part (37) conveys the sheet to withdraw the one roller (35A) in the separating direction from the first reference line (L5).

An image forming apparatus (100) includes an image bearing member (14), a charging unit (15), a laser scanning unit (19), a developing unit (16), a transfer member (18), a recording medium conveyance path (4), a cleaning unit (17), and a heating element (53). The recording medium conveyance path (4) includes a resin member (51) that forms a conveyance surface. The resin member (51) has a concave portion (51a) at a location closer to the transfer member (18) than to the image bearing member (14). The heating element (53) for heating the image bearing member (14) is accommodated in the concave portion (51a). The heating element (53) is disposed downstream from the contact point (02) between the image bearing member (14) and the transfer member (18) in the conveyance direction in which a recording medium (P) is conveyed through the recording medium conveyance path (4). The developing unit (16) is located upstream from the contact point (02) between the image bearing member (14) and the transfer member (18) in the conveyance direction of the recording medium (P).

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An image reading apparatus for reading an image of an original document includes a document placement surface, an illumination unit, a light-receiving unit, and an illumination control unit. The illumination unit includes: a first light guiding body in a bar shape extended in a first direction configured to irradiate a light to the original document along a second direction, a second light guiding body arranged at a distance from the first light guiding body configured to irradiate a light to the original document along a third direction, a pair of first light sources emits illuminating lights to be injected into the first incident surfaces, a pair of second light sources emits illuminating lights to be injected into the second incident surface. The illumination control unit is configured to control light-emitting operations of the first light source and the second light source corresponding to the reading mode.

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