Developer supply device
AssigneeCanon Kabushiki Kaisha
InventorYuji Takahashi
Life of this patent
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Abstract
A developer supply device for supplying developing apparatus with a developer consisting of a mixture of toner and carrier, is characterized in that when toner and carrier are supplied separately to the developing apparatus, a magnetic field is provided near a carrier storage device storing carrier therein and the supply of the carrier is controlled by the magnetic field.
Claims15
A developer supply device for supplying a developing device with developer consisting of a mixture of toner and carrier, said developer supply device having:
- toner supply means for supplying toner;
- carrier supply means having a supply port for supplying carrier;
- magnetic field forming means provided near the carrier supply port of said carrier supply means and including an electromagnet and a permanent magnet disposed in opposed relation therewith;
- and
- means for controlling the intensity of a magnetic field imparted to the supply port of said carrier supply means by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage of the carrier through said carrier supply port and prevention of said passage are selectively effected.
A developer supply device for supplying a developing device with developer consisting of a mixture of toner and carrier, said developer supply device having:
- toner supply means for supplying toner;
- carrier supply means having a supply port for supplying carrier;
- magnetic field forming means provided near the carrier supply port of said carrier supply means;
- means for controlling the intensity of a magnetic field imparted to the supply port of said carrier supply means by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage of the carrier through said carrier supply port and prevention of said passage are selectively effected;
- and
- detector means for detecting the presence of the carrier in said supply means.
A developer supply device for supplying developer to a developing device, having:
- storage means formed with a supply portion for storing the developer therein;
- magnetic field forming means provided near the supply portion of said developer storage means and including an electromagnet and a permanent magnet disposed in opposed relation therewith;
- and
- means for controlling the intensity of a magnetic field imparted to the developer supply portion by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage and stagnation of the developer in the supply portion are controlled.
Dependencies are inferred from the claim text.