Process cartridge and image forming apparatus

A cartridge comprising:

• (i) a rotatable developing roller;
• (ii) a rotatable toner supplying roller provided in contact with the developing roller, the toner supplying roller being configured to supply toner to the developing roller;
• (iii) a toner chamber configured to contain toner;
• (iv) a developing chamber in which the toner supplying roller is positioned;
• (v) a feeding member provided in the toner chamber and configured to feed the toner from the toner chamber to the developing chamber;
• (vi) a coupling operatively connected to the toner supply roller and configured to receive a driving force for driving the toner supplying roller, the developing roller, and the feeding member;
• wherein the developing roller is configured to receive the driving force from the coupling via the toner supplying roller, and
• wherein the cartridge is configured such that, when the coupling receives the driving force and the cartridge is oriented with the developing roller positioned above the toner chamber, (i) a rotational direction of the developing roller is opposite to a rotational direction of the toner supplying roller, (ii) a part of a surface of the toner supplying roller rotates from a first position at which the part of the surface of the toner supply roller contacts a surface of the developing roller to a second position where the part of the surface of the toner supplying roller moves out of contact with the surface of the developing roller, with the first position being above the second position, (iii) the feeding member feeds toner upward from the toner chamber to the developing chamber, and (iv) a speed of the surface of the toner supplying roller is greater than a speed of the surface of the developing roller.

A cartridge comprising:

• (i) a rotatable developing roller;
• (ii) a rotatable toner supplying roller provided in contact with the developing roller, the supplying roller being configured to supply toner to the developing roller;
• (iii) a toner chamber to contain toner;
• (iv) a developing chamber in which the toner supplying roller is positioned;
• (v) a rotatable feeding member provided in the toner chamber and configured to feed the toner from the toner chamber to the developing chamber;
• (vi) a coupling operatively connected to the toner supplying roller and configured to receive a driving force for rotating the toner supplying roller, the developing roller, and the feeding member,
• (vii) a first gear operatively connected to the toner supplying roller and configured to transmit the driving force received by the coupling to the developing roller;
• and
• (viii) a second gear operatively connected to the developing roller and configured to transmit the driving force from the first gear to the developing roller,
• wherein the cartridge is configured such that, when the coupling receives the driving force and the cartridge is oriented with the developing roller positioned above the toner chamber, (i) a rotational direction of the developing roller is opposite to a rotational direction of the toner supplying roller, (ii) a part of a surface of the toner supplying roller rotates from a first position at which the part of the surface of the toner supplying roller contacts a surface of the developing roller to a second position where the part of the surface of the toner supplying roller separates from the surface of the developing roller, with the first position being above the second position, (iii) the feeding member feeds toner upward from the toner chamber to the developing chamber, and (iv) a speed of the surface of the toner supplying roller is greater than a speed of the surface of the developing roller.

A cartridge comprising:

• (i) a rotatable developing roller;
• (ii) a rotatable toner supplying roller provided in contact with the developing roller and configured to supply toner to the developing roller, the toner supplying roller including a shaft;
• (iii) a toner chamber configured to contain toner;
• (iv) a developing chamber in which the toner supplying roller is positioned;
• (v) a rotatable feeding member provided in the toner chamber and configured to feed the toner from the toner chamber to the developing chamber;
• (vi) a developing blade provided in contact with the developing roller and configured to regulate toner on a surface of the developing roller,
• (vii) a coupling provided at the shaft of the toner supplying roller and configured to receive a driving force;
• and
• (viii) a plurality of gears configured to transmit the driving force from the toner supplying roller to the developing roller and the feeding member such that (i) the toner supplying roller and the feeding member rotate in a direction opposite to a rotational direction of the developing roller, and (ii) a speed of a surface of the toner supplying roller is greater than a speed of the surface of the developing roller,
• wherein the cartridge is configured such that, when the coupling receives the driving force and the cartridge is oriented with the developing chamber positioned above the toner chamber, (i) a part of the surface of the toner supplying roller rotates from a first position at which the part of the surface of the toner supply roller contacts the surface of the developing roller to a second position where the part of the surface of the toner supplying roller moves out of contact with the surface of the developing roller, with the first position being above the second position, and (ii) the feeding member feeds toner upward from the toner chamber to the developing chamber.