PROBLEM TO BE SOLVED: To provide a toner storage container that includes low temperature fixability, hot offset resistance and heat-resistant storage stability.SOLUTION: A toner storage container 32 of an image formation device comprises: a rotatable powder storage part 33 that stores toner; an opening part 33a that is capable of inserting a conveyance pipe 611 provided in one end of the powder storage part into a rotation center of the toner storage container; a spiral protrusion 302 that protrudes inward the toner storage container, and conveys the toner in the powder storage part to an opening part; and a powder drawing unit 304 that draws the toner on the opening part side due to rotation of the powder storage part to supply the toner to a powder inlet port 610. The powder drawing unit has a drawing surface 3040 that extends toward a rotation center axis side from an inner wall surface of the powder storage part. The drawing surface is configured such that an inner end part on the rotation center axis side extends toward the rotation center axis direction of the powder storage part and an edge of the inner end part is almost parallel with the rotation center axis, and the drawing surface is inclined at an inclination angle of a prescribed range toward an upstream side in a rotation direction of the powder storage part with respect to a virtual straight line passing the rotation center axis and the edge of the inner end part. The spiral protrusion is connected to the drawing surface to extend in a peripheral direction from the drawing surface.SELECTED DRAWING: Figure 1

Toner storage container and image formation device

A developer replenishment container 1 comprises: a cylindrical part 2k capable of storing a developer; a second outlet 4a, provided in the cylindrical part 2k, for discharging the developer therein; a storage part 4d communicating with the second outlet 4a inside the cylindrical part 2k and capable of storing a prescribed amount of developer; a pump 3a capable of changing the volume inside the cylindrical part 2k in the longitudinal direction of the replenishment container 1 to cause pressure to act on at least the second outlet 4a; a communication passage 20a capable of ventilating between the pump 3a and the storage part 4d; and a partition wall 20, provided at a joint between the pump 3a and the communication passage 20a, for suppressing air generated from the pump (3a) and flowing toward the cylindrical part 2k at least during a discharging operation

Developer replenishment container and developer replenishment device

PROBLEM TO BE SOLVED: To provide a developer supply cartridge that has excellent accuracy of supplying developer to an image forming apparatus irrespective of use environment even when the developer is in a compacted state.SOLUTION: A developer supply cartridge includes developer, and a developer supply container that can be removably attached to a developer supply device, where the developer supply container includes a pump part 3a that is operated to be repeatedly switched between a state in which the inner pressure of a developer storage part is lower than the atmospheric pressure and a state in which the inner pressure is higher than the atmospheric pressure, and the developer has a uniaxial collapse stress of 2.5 kPa or more and 3.5 kPa or less at a maximum consolidation stress of 10.0 kPa.

Developer supply cartridge and developer supply method

PROBLEM TO BE SOLVED: To provide a development apparatus having toner residual amount detecting means which accurately detects an amount of a toner remaining in a development apparatus and successively notifies a user of a toner residual amount and the number of residual printable sheets, and to provide an image forming method.SOLUTION: There is a development apparatus which has a region formed of a nonmagnetic conductive resin member existing on the bottom surface of a toner storage section 3a, detects an amount of a toner in the toner storage section 3a based on electrostatic capacity between the toner carrier body 8 and the region, where a toner agitating member 10 rotates with a rotating shaft parallel to the toner carrier body 8, a line parallel to an installation surface of a printer passing through a rotation center axis of the toner agitating member 10 is arranged below the lower end of the toner carrier body 8, a toner is supplied from the lower part of the toner carrier body 8, the toner has toner particles containing a binder resin and a magnetic body and an external additive, an uniaxial yield stress at the time of the maximum compaction stress of 10.0 kPa is 2.5 kPa or more and 4.5 kPa or less, and a total energy at the time of fifth measurement after compression is 70 mJ or more and 105 mJ or less.SELECTED DRAWING: Figure 3

Development apparatus and image forming method

PROBLEM TO BE SOLVED: To provide a supply container in which a developer can be stably discharged with lower drive energy from the supply container to an apparatus main body.SOLUTION: A supply container 1 includes: a cylindrical part 2k housing a developer; an inclined rib 6a to convey the developer inside the cylindrical part 2k; a discharge part 4c having a discharge port to discharge the developer; a gear 2d that receives an input of rotation drive force; a pump 3a that acts on the discharge part 4c to vary an inner volume in a longitudinal direction of the supply container 1; and a first cam groove 2X, a second cam groove 2Y, and a reciprocating member 3b for converting the rotation drive force input to the gear 2d into conveyance drive force to convey the developer in a longitudinal direction of the supply container 1, which convert the rotation drive force in such a manner that an expansion/contraction stroke amount by expansion and contraction of the pump 3a in an initial rotation period when the gear 2d receives the rotation drive force and the inclined rib 6a first rotates at a predetermined rotational number, is different from an expansion/contraction stroke amount by expansion and contraction of the pump 3a after the initial rotation period.SELECTED DRAWING: Figure 11

Developer supply container, developer supply device, and image forming apparatus

PROBLEM TO BE SOLVED: To provide a developer replenishment kit in which the replenishment accuracy of a developer from the developer replenishment kit to an image forming apparatus is higher.SOLUTION: The developer replenishment kit comprises a developer replenishment container and the developer stored in the developer replenishment container and can be attached to and detached from a developer replenishment device. The developer replenishment container includes a developer storage part storing the developer, a discharge port through which the developer stored in the developer storage part is discharged, a drive receiving part to which a driving force is inputted from the developer replenishment device, and a pump part operated so that the internal pressure of the developer storage part is alternately and repeatedly switched between a state of being lower than atmospheric pressure and a state of being higher than the atmospheric pressure by the driving force received by the drive receiving part. The developer stored in the developer replenishment container has toner containing a binder resin and a colorant. The developer satisfies the following expression: 10≤E(mJ)≤800.4≤Ea(mJ)≤2.0, where E is the total energy when air is not ventilated and Ea is the total energy when air is ventilated.

Developer replenishment kit, developer replenishment device, and image forming apparatus

PROBLEM TO BE SOLVED: To provide a container for electrophotographic toner giving images with stable developing property and no degradation of picture quality due to development stripes even when a great number of sheets are continuously printed in a high temperature and high humidity environment. SOLUTION: The container for an electrophotographic toner stores the toner, wherein a thermoplastic elastomer is used as a toner sealing member. In the molecular weight distribution chart of the molecular weight of the thermoplastic elastomer in terms of a tetrahydrofuran soluble content fraction measured by gel permeation chromatography, an area ratio of a component having a molecular weight of 800 or less to the whole ranges from 0.05% to 30.00%. The toner contains toner particles and an inorganic fine powder. When methanol concentrations (%) during 50% transmittance by methanol wettability tests after the toner particles are left to stand in environments of 20°C and 40°C for 5 hours, are defined as D20 and D40, respectively, relationships of 10.0≤D20≤40.0 and 0≤D40-D20≤2.0 are satisfied. COPYRIGHT: (C)2010,JPO&INPIT

Container for electrophotographic toner and image forming method

PROBLEM TO BE SOLVED: To provide a charge control resin which is excellent in severe environmental stability and shelf stability under a high-temperature high-humidity environment, and a toner which is excellent in severe environmental stability, shelf stability under a high-temperature high-humidity environment, contamination prevention of members, and development durability and allows formation of a high quality image.SOLUTION: A charge control resin is obtained by polymerizing at least a polymerizable monomer and a polymerizable charge control resin. The polymerizable charge control resin contains an aromatic vinyl monomer unit and a monomer unit including a sulfonic acid group, a sulfonic acid salt group or a sulfonic acid ester group as a constitutional unit and is a macromonomer having a styrene double bond at a terminal. In measurement by a nuclear magnetic resonance apparatus employing a heavy chloroform solvent, the polymerizable charge control resin has a peak derived from the double bond in 4.6-4.9 ppm and 5.0-5.3 ppm and has an acid value of 5.0 mgKOH/g or more and 50.0 mgKOH/g or less.

Charge control resin and toner including the same

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Developer replenishment kit, developer replenishment device, and image forming apparatus

Container for electrophotographic toner and image forming method

Charge control resin and toner including the same