摘要:
An image forming apparatus, wherein the packing density at a closest point where the first peripheral surface and the second peripheral surface are the closest to each other is within a range from 0.3 to 0.4; wherein a maximum magnetic flux density of a principal magnetic pole for generating the magnetic field for development is located in an upstream side from the closest point with respect to the specified direction and at a point where the packing density is equal to or greater than 0.2; and wherein a magnetic flux density of the principal magnetic pole at a point where the packing density is 0.2 in a downstream side from the closest point with respect to the specified direction is equal to or less than ½ of a magnetic flux density of the principal magnetic pole at a point where the packing density is 0.2 in the upstream side.
摘要:
An image forming apparatus for forming a toner image on a print medium with a developer composed of toner and carriers, wherein when the first distance is longer than the second distance, an average gap between the first peripheral surface and a member that faces to the first peripheral surface in an area with a length of the first distance extending upstream from the closest point with respect to the specified direction is smaller than an average gap between the first peripheral surface and a member that faces to the first peripheral surface in an area with a length of the first distance extending downstream from the closest point with respect to the specified direction.
摘要:
An image forming apparatus, wherein the packing density at a closest point where the first peripheral surface and the second peripheral surface are the closest to each other is within a range from 0.3 to 0.4; wherein a maximum magnetic flux density of a principal magnetic pole for generating the magnetic field for development is located in an upstream side from the closest point with respect to the specified direction and at a point where the packing density is equal to or greater than 0.2; and wherein a magnetic flux density of the principal magnetic pole at a point where the packing density is 0.2 in a downstream side from the closest point with respect to the specified direction is equal to or less than ½ of a magnetic flux density of the principal magnetic pole at a point where the packing density is 0.2 in the upstream side.
摘要:
An image forming apparatus for forming a toner image on a print medium with a developer composed of toner and carriers, wherein when the first distance is longer than the second distance, an average gap between the first peripheral surface and a member that faces to the first peripheral surface in an area with a length of the first distance extending upstream from the closest point with respect to the specified direction is smaller than an average gap between the first peripheral surface and a member that faces to the first peripheral surface in an area with a length of the first distance extending downstream from the closest point with respect to the specified direction.
摘要:
An image forming apparatus with a charging member that allows easy removal of smears from an image forming drum. The apparatus removes smears from the image forming drum by placing a different portion of the charging member in contact with the drum. The apparatus uses a cam or a solenoid to press on the charging member to cause a different portion of the charging member to come into contact with the image forming drum.
摘要:
To provide an image forming apparatus that prevents generation of image noise by controlling creep of a movable member having flexibility. The image forming apparatus for forming images on a recording medium comprises a movable member having flexibility, a detection section for detecting temperature of the movable member directly, and a control section for executing control so that when image forming is not conducted, the movable member is temporarily operated at predefined intervals if a temperature detected by the detection section is equal to or above a specified temperature, and the movable member is not operated if a temperature detected by the detection section is below the specified temperature.
摘要:
A blade for cleaning an image holding member of an image forming unit is urged so as to contact the image holding member, and a member for obstructing the blade from contacting the image holding member by urged strength is arranged to release the obstruction. The member is further arranged so as to regulate returning action to the state of obstruction after the obstruction is released. Accordingly, when the blade is released from the state of obstruction by the obstruction member, the blade comes in contact with the image holding member by the urged strength and afterward it is kept in the state of contact since the obstructing function of the obstruction member is regulated.
摘要:
An image forming apparatus includes a laser beam radiating unit utilized as a light source, and an optical system that the surface of an original reflects a laser beam radiated from the radiating unit to project an image reflected from the original onto a photosensitive member. In this apparatus, an image is formed selectively in a print mode that an image results from turning on and off the laser beam, in a copy mode that a copy of an original results from exposure of the photosensitive member to the laser beam reflected from the surface of an original or in a composite mode that a composite image is formed of a copy of an original and an image resulting from turning on and off the laser beam. Also, this apparatus comprises a reflector for directing the laser beam to the photosensitive member, and the reflector is automatically set at the reflecting position when the original cover is open or the print mode is selected. Further, this apparatus comprises a lock system for locking an original cover; the lock system works to lock the original cover when the copy mode or the composite mode is selected and to unlock the cover when the print mode is selected.
摘要:
A developing device has a bearing member that can bear a toner, a storing chamber for storing the toner, a waiting chamber disposed below the storing chamber for receiving the bearing member that can be filled with the toner and a buffer chamber positioned between the storing chamber and the waiting chamber for storing the developer material. A first horizontal connecting path connects upper portions of the storing and buffer chambers, and two second connecting paths connect lower portions of the buffer chamber and the waiting chamber. A feed member feeds toner from the storing chamber through the first connecting path into the buffer chamber. A first conveying member in the buffer chamber conveys the toner from one of the connecting paths to the other of the connecting paths, and a second conveying member in the waiting chamber conveys the toner within the waiting chamber in the opposite direction.
摘要:
A fixed frame includes a photosensitive drum and a developing unit, and a movable frame is openable with respect to the fixed frame. The developing unit, which has two pairs of protrusions thereon, is detachably mounted to the fixed frame by engaging the protrusions with two pairs of guides provided on the fixed frame. One pair of guides includes a portion for momentarily catching one pair of the protrusions as the developing unit is being mounted to the apparatus, and each of the other pair of guides includes a inclined portion having the shape of an arc centered on the momentarily catching portion, whereby an impact to the developing unit is alleviated. The developing unit has a shutter which moves to a position for covering a peripheral surface of a developing sleeve when the developing unit is being dismounted, and which retracts from the developing sleeve covering position and moves to a position for covering the photosensitive drum when the developing unit is being mounted. The movable frame accommodates a fixing device to move the fixing device rearwardly together with the movable frame when the movable frame is opened, whereby the danger of an operator touching the fixing device when the apparatus is opened is reduced.