摘要:
An image forming apparatus is operable in a mode in which a speed of an intermediary transfer belt is changed after all of the toner images are primary-transferred onto the intermediary transfer belt, and the toner image primary-transferred on the intermediary transfer belt is passed through a secondary transfer position and primary transfer position in this order to reach the secondary transfer position, where the toner image is secondary transferred onto the transfer material, and a controller for making, before the image forming apparatus is operated in the mode to change the speed of the intermediary transfer belt, a potential difference between the intermediary transfer belt and the photosensitive member at the primary transfer position smaller than a potential difference between the intermediary transfer belt and the photosensitive member when the toner image is primary transferred from the photosensitive member onto the intermediary transfer belt.
摘要:
In a rotary-type image forming apparatus, rotation of a rotary is temporarily stopped at a position where a coupling member and a drive transmission member are engageable with each other, and a developing roller is set in a rotating state. Subsequently, the rotary is rotated so as to bring the developing roller into contact with a surface of a photosensitive drum.
摘要:
An image forming apparatus includes a rotary for changing an attitude of a developing device to a first attitude in which developer in a developer accommodating chamber is feedable to a developer feeding member and to a second attitude in which the developer having been located above a nip between the developer feeding member and a developing roller drops from the nip. In the image attitude of the developing device, an electrostatic latent image is developed. In the second attitude of the developing device, detection of a remaining amount of the developer is carried out.
摘要:
An image forming apparatus which forms an image by using a unit having at least a member associated with image formation and storage unit storing information, comprising, an image carrier, developing unit for developing a latent image formed on said image carrier by supplying toner to said image carrier and controller for controlling image formation operation on the basis of the information stored in said storage unit, wherein said storage unit stores information for controlling toner consumption operation in accordance with a characteristic of the toner, and said controller controls the toner consumption operation on the basis of the information stored in said storage unit without printing any image on a print medium.
摘要:
A control method of a voltage to be applied to an electrifier includes the steps of measuring an integral value of an alternating waveform, and controlling an alternating current so that the integral value is constant in a predetermined time.
摘要:
A developing device includes a developer carrying member, rotatable while carrying a developer, for supplying developer to an image bearing member, a developer supplying member, which is provided with a foam layer at its surface and is rotatable in contact with the developer carrying member, for supplying the developer to the developer carrying member, and a first gear for transmitting a driving force to the developer supplying member. The first gear is movable to a first position where the driving force is not transmitted to the developer supplying member and to a second position where the driving force is transmitted to the developer supplying member. During initial drive of the developer carrying member, the developer supplying member is rotated by a frictional force generated between the developer supplying member and the developer carrying member, with the first gear to be moved from the first position to the second position.
摘要:
In an image forming apparatus of a rotary type, when a pause is made during continuous image formation, the time taken to restart image formation after the pause is shortened so as to reduce stress on the user. In the image forming apparatus, it is determined beforehand whether the next image formation mode is a color mode or a mono mode, and a developing device to be first used in the next image formation mode is moved to a developing standby position.
摘要:
An image forming apparatus includes a rotary for changing an attitude of a developing device to a first attitude in which developer in a developer accommodating chamber is feedable to a developer feeding member and to a second attitude in which the developer having been located above a nip between the developer feeding member and a developing roller drops from the nip. In the image attitude of the developing device, an electrostatic latent image is developed. In the second attitude of the developing device, detection of a remaining amount of the developer is carried out.
摘要:
An image forming apparatus including: an image bearing member; an electrifying unit for electrifying the image bearing member at a contact portion in order to form an electrostatic image on the image bearing member, a voltage, in which a direct-current voltage and an alternating-current voltage are superimposed on each other, being applied to the electrifying unit; and a developing unit for developing the electrostatic image on the image bearing member using toner; where after a toner image on the image bearing member is transferred onto a transferring medium, residual toner residing on the image bearing member is carried to the contact portion in accordance with rotation of the image bearing member, and a peak to peak voltage of the alternating-current voltage applied to the electrifying unit in order to discharge the residual toner adhering to the electrifying unit to the image bearing member during a certain period of non-image forming is set so as to be higher than a peak to peak voltage applied during image forming.
摘要:
In order not to expel toner excessively when bias is applied, a cleanerless image forming apparatus includes a first developer charge amount controlling device 7, provided on a downstream side of a transfer device 5 in a moving direction of an image bearing member 1, e.g. a photosensitive drum, for applying a DC bias for making uniform a charge amount of residual developer remaining on the image bearing member 1, and/or a second developer charge amount controlling device 8, provided on a downstream side of the first developer charge amount controlling device 7 in a rotating direction of the image bearing member 1, for applying a DC bias for charging the residual developer in a normal polarity. An absolute value of a slope of the DC voltage applied to the first developer charge amount controlling device 7 and/or an absolute value of a slope of the DC voltage applied to the second developer charge amount controlling device 8 are equal to 2000 V/sec or smaller.