摘要:
A charge quenching apparatus for quenching unnecessary charges on a latent electrostatic-image bearing photoconductor of an electrophotographic copying machine for making copies with clean margins when the size of the maximum-latent-image area on the photoconductor, corresponding to the size of the original, is smaller than the transfer sheet employed, in the unit magnification and in the variable magnification, and for making copies without applying excess load to a cleaning apparatus of the photoconductor when copies bearing part of the image of the original are made or when copies bearing a reduced-size image of the original are made. In the charge quenching apparatus, the size of the maximum-latent-image area selected and the size of the transfer sheet selected are compared, and charges in the area outside the area corresponding to the smaller size determined by the above-mentioned comparison are quenched.
摘要:
A magnetic permeability detector includes an LC oscillator circuit including a coil and a capacitor; and a resistor connected in series with the coil.
摘要:
A magnetic permeability detector includes an LC oscillator circuit including a coil and a capacitor; and a resistor connected in series with the coil.
摘要:
A powder conveying apparatus includes a powder containing unit that contains powder and at least a portion of which is deformable; a discharging unit that discharges the powder from the powder housing unit to an outside; a delivery member that moves toward the discharging unit side while pushing the deformable portion of the powder containing unit inward to thereby convey the powder to the discharging unit; and an oscillation applying unit that applies oscillation to the discharging unit. Driving of the oscillation applying unit is controlled in response to an operation of the delivery member.
摘要:
A developing device for an image forming apparatus includes a developer carrier such as a developing sleeve having a magnetic field generating device therein which carries and conveys a developer containing toner and magnetic carrier particles. The developing device also includes a first regulating member such as a blade which regulates the developer being carried and conveyed by the developer carrier, and a developer storing section stores developer scraped off the developer carrier by the first regulating member. The developer storing section includes a second regulating member arranged upstream of the first regulating member with respect to a direction in which the developer carrier conveys the developer. The developing device further includes a toner storing section provided adjacent to the developer storing section to supply toner to the developer carrier. A contact condition of the developer carried on the developer carrier with the toner supplied to the developer carrier from the toner storing section is varied in accordance with variation of a toner density in the developer carried on the developer carrier to thereby vary a condition of the developer on the developer carrier to attract the toner. The second regulating member is spaced from the developer carrier such that when a thickness of a layer of the developer on the developer carrier increases due to an increase of the toner density in the developer on the developer carrier, the second regulating member regulates an increased amount of the developer being carried and conveyed by the developer carrier. The magnetic fields, toner speeds, and distances of the regulating members to the developer carrier satisfy predetermined conditions in different embodiments.
摘要:
A toner sorting device includes a device for taking in used toner conveyed from an image forming apparatus and conveying the used toner in one direction, and a device for sifting the used toner conveyed from the intake device to separate reusable toner from the used toner. The sifting device includes a tubular sieve for separating reusable toner from the used toner and a device for holding the sieve so that the sieve is rotatable. The sieve has an opening for receiving the used toner conveyed from the intake device to be moved into the sifting device and an opening for discharging the remaining toner separated from the reusable toner and remaining inside the sifting device. The toner sorting device further includes a device for collecting the reusable toner separated from the used toner by the sifting device and a device for collecting the remaining toner discharged from the sifting device. The toner sorting device further includes a device for accelerating sifting of the used toner by the sifting device.
摘要:
Image forming apparatus having two identical toner handling units each functioning as a developing device when located in a developing position or as a cleaning device when located in a cleaning position. The image forming devices are alternately and repetitively set in the developing position and cleaning position.
摘要:
A two-component toner is directly supplied to a brush which is cyclically transferred while in resilient contact with a latent image carrier for developing an electrostatic latent image on the latent image carrier. After the image has been developed by the toner, residual toner is directly recovered from the brush for uniformizing the toner density on the brush.
摘要:
A nozzle insertion member arranged in a powder container includes a nozzle insertion opening; an opening/closing member opening/closing the nozzle insertion opening; a supporting member supporting the opening/closing member; and a biasing member provided to the supporting member to bias the opening/closing member toward a closing position. When the powder is supplied to the conveying nozzle along with rotation of a rotary conveyor arranged inside the powder container, the supporting member rotates with the rotation of the conveyor. The opening/closing member is rotated by a drive transmitting mechanism with rotation of the supporting member. The mechanism includes an elongated member arranged on the opening/closing member and penetrating through an opening formed on the supporting member; and a drive transmitted portion formed on the elongated member; and a drive transmitting portion formed on an inner surface of the opening and configured to come into contact with the drive transmitted portion.
摘要:
A nozzle insertion member arranged in a powder container includes a nozzle insertion opening; an opening/closing member opening/closing the nozzle insertion opening; a supporting member supporting the opening/closing member; and a biasing member provided to the supporting member to bias the opening/closing member toward a closing position. When the powder is supplied to the conveying nozzle along with rotation of a rotary conveyor arranged inside the powder container, the supporting member rotates with the rotation of the conveyor. The opening/closing member is rotated by a drive transmitting mechanism with rotation of the supporting member. The mechanism includes an elongated member arranged on the opening/closing member and penetrating through an opening formed on the supporting member; and a drive transmitted portion formed on the elongated member; and a drive transmitting portion formed on an inner surface of the opening and configured to come into contact with the drive transmitted portion.