Abstract: An image forming apparatus includes: a photoconductor drum; a developing device having a plurality of developer rollers and supplying toner to the photoconductor drum; a first pressing force applier that applies a force to the developing device to press the plurality of developer rollers toward the photoconductor drum; and a second pressing force applier that flexibly holds the developing device in a vertical direction.

Abstract: An image forming apparatus includes: a photoconductor drum; a developing device having a plurality of developer rollers and supplying toner to the photoconductor drum; a first pressing force applier that applies a force to the developing device to press the plurality of developer rollers toward the photoconductor drum; and a second pressing force applier that flexibly holds the developing device in a vertical direction.

Abstract: An image forming system includes: an image forming apparatus configured to form an image on a paper sheet; a toner amount sensing device including a reading unit configured to read the paper sheet having the image formed thereon by the image forming apparatus; a charging device including a charging unit configured to electrically charge the paper sheet having the image formed thereon by the image forming apparatus; and a control unit configured to acquire an amount of toner adhering to the paper sheet by reading the paper sheet with the reading unit, and control the charging unit based on the amount of toner.

Abstract: An image forming system includes: an image forming apparatus configured to form an image on a paper sheet; a toner amount sensing device including a reading unit configured to read the paper sheet having the image formed thereon by the image forming apparatus; a charging device including a charging unit configured to electrically charge the paper sheet having the image formed thereon by the image forming apparatus; and a control unit configured to acquire an amount of toner adhering to the paper sheet by reading the paper sheet with the reading unit, and control the charging unit based on the amount of toner.

Abstract: A fixing device includes a pair of detachable rollers and applies heat and pressure to a sheet nipped between the rollers to fix a toner image formed on the sheet to the sheet. The fixing device includes a biasing part which gives a biasing force to bring one of the rollers into tight contact with the other, an adjusting part which adjusts the biasing force of the biasing part, and a guide indication part providing a guide for an amount of adjustment to be made by the adjusting part in accordance with the hardness of the surface layer of a roller of the rollers.

Abstract: The image forming apparatus according to the present invention has a fixing member and a paper separation part. The fixing member fixes an image by heating and applying a pressure to a sheet of printing paper S on which a toner image is transferred, while transferring the paper S. The paper separation part has a blower part and an air ejecting part that ejects the air sent out from the blower part against a paper outlet port of a nipping part N of the fixing member. The air ejection part has ribs that divide the air flow sent out from said blower part.

Abstract: A fixing device includes a pair of detachable rollers and applies heat and pressure to a sheet nipped between the rollers to fix a toner image formed on the sheet to the sheet. The fixing device includes a biasing part which gives a biasing force to bring one of the rollers into tight contact with the other, an adjusting part which adjusts the biasing force of the biasing part, and a guide indication part providing a guide for an amount of adjustment to be made by the adjusting part in accordance with the hardness of the surface layer of a roller of the rollers.

Abstract: When an arm member 50 moves a pressure roller 36 away from a fixing roller 33, a guide mechanism 60 moves an air nozzle 40 in synchronization with the motion of the arm member 50 in order that a nozzle tip 40a moves an operating position near a fixing nip portion NP and a parking position to which the nozzle tip 40a is retracted from the operating position.

Abstract: The rotating speed of the coating brush of the image forming apparatus fluctuates between the upper limit speed and the lower limit speed across the standard speed. Consequently, the positional relation of the contact between the brush textile of the coating brush and the surface of the photographic sensitive drum varies for a wider range compared to a case where the rotating speed of the coating brush does not vary. Since the thin area of the brush textile moves for a wider range of the surface of the photographic sensitive drum in the axial direction of the rotating shaft of the photographic sensitive drum, the area where the coating amount of the lubricant is less is evened out by the area where the coating amount of the lubricant is rich, thus improving the unevenness of coating of the lubricant on the photographic sensitive drum.

Abstract: A fixing device includes: a fixing member which fixes a toner image on a sheet; a plurality of sliding contact members which sliding contact a surface of the fixing member in which roughness of sliding surfaces of the plurality of sliding contact members is different from each other; a counter which accumulates a count value based on the number of fixing operations to determine a contact period of time of the plurality of sliding contact members to be brought into contact with the fixing member; and a controller which controls the plurality of sliding contact members to be brought into contact with the fixing member based on the accumulated count value of the counter.

Abstract: When an arm member 50 moves a pressure roller 36 away from a fixing roller 33, a guide mechanism 60 moves an air nozzle 40 in synchronization with the motion of the arm member 50 in order that a nozzle tip 40a moves an operating position near a fixing nip portion NP and a parking position to which the nozzle tip 40a is retracted from the operating position.

Abstract: An image forming apparatus includes: an image forming section which transfers a toner image in accordance with image data onto a recording sheet; a first fixing device having a first fixing roller, which fixes the toner image onto the recording sheet with heat; a second fixing device having a second fixing roller, which further applies heat to the recording sheet that has been fixed by the first fixing device; a second fixing roller surface roughness prevention mechanism which prevents a roughness on a surface of the second fixing roller that has been generated due to side ends of the recording sheet being brought into contact with the surface of the second fixing roller; and a controller which controls the image forming section, the first and second fixing devices and the second fixing roller surface roughness prevention mechanism.

Abstract: A fixing unit is provided with a fixing member to heat a recoding medium and to fix a toner image on the recording medium; a pressure member to press the fixing member to form a nip portion in which a recording medium carrying a toner image is nipped; an auxiliary heating member to heat the surface of the fixing member; and a surface recovery member, arranged at a downstream side of the first auxiliary heating member in a rotational direction of the fixing member, for recovering damage to a surface of the fixing member by making contact with and sliding on the fixing member.

Abstract: The image forming apparatus according to the present invention has a fixing member and a paper separation part. The fixing member fixes an image by heating and applying a pressure to a sheet of printing paper S on which a toner image is transferred, while transferring the paper S. The paper separation part has a blower part and an air ejecting part that ejects the air sent out from the blower part against a paper outlet port of a nipping part N of the fixing member. The air ejection part has ribs that divide the air flow sent out from said blower part.

Abstract: Disclosed is an image forming device which can prevent occurrence of damage on the surface of a fixing roller or a fixing belt due to the contact of the end of a sheet with the fixing roller or fixing belt. The image forming device, for transferring a toner image to a sheet fed out from a sheet feed section and fixing the toner image to the sheet by pressing the sheet carrying the toner image at a fixing section, includes a moving section for moving the sheet and or the fixing section in the direction at right angles to the traveling direction of the sheet within a preset moving range, the moving section being controlled based on a preset operation pattern.

Abstract: Provided is an image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein occurrence of uneven print gloss is prevented. The image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein one of the two rotary members is a belt which rotates while being stretched around of a plurality of rollers, a roller arranged at the exit of the nip portion out of the plurality of rollers has a crown shape, and a slack absorbing member for absorbing a slack of both ends of the belt caused by the crown-shaped roller is in contact with the belt.

Abstract: The rotating speed of the coating brush of the image forming apparatus fluctuates between the upper limit speed and the lower limit speed across the standard speed. Consequently, the positional relation of the contact between the brush textile of the coating brush and the surface of the photographic sensitive drum varies for a wider range compared to a case where the rotating speed of the coating brush does not vary. Since the thin area of the brush textile moves for a wider range of the surface of the photographic sensitive drum in the axial direction of the rotating shaft of the photographic sensitive drum, the area where the coating amount of the lubricant is less is evened out by the area where the coating amount of the lubricant is rich, thus improving the unevenness of coating of the lubricant on the photographic sensitive drum.

Abstract: A fixing device includes: a fixing member which fixes a toner image on a sheet; a plurality of sliding contact members which sliding contact a surface of the fixing member in which roughness of sliding surfaces of the plurality of sliding contact members is different from each other; a counter which accumulates a count value based on the number of fixing operations to determine a contact period of time of the plurality of sliding contact members to be brought into contact with the fixing member; and a controller which controls the plurality of sliding contact members to be brought into contact with the fixing member based on the accumulated count value of the counter.

Abstract: Provided is an image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein occurrence of uneven print gloss is prevented. The image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein one of the two rotary members is a belt which rotates while being stretched around of a plurality of rollers, a roller arranged at the exit of the nip portion out of the plurality of rollers has a crown shape, and a slack absorbing member for absorbing a slack of both ends of the belt caused by the crown-shaped roller is in contact with the belt.

Abstract: An image forming apparatus includes: an image forming section which transfers a toner image in accordance with image data onto a recording sheet; a first fixing device having a first fixing roller, which fixes the toner image onto the recording sheet with heat; a second fixing device having a second fixing roller, which further applies heat to the recording sheet that has been fixed by the first fixing device; a second fixing roller surface roughness prevention mechanism which prevents a roughness on a surface of the second fixing roller that has been generated due to side ends of the recording sheet being brought into contact with the surface of the second fixing roller; and a controller which controls the image forming section, the first and second fixing devices and the second fixing roller surface roughness prevention mechanism.