Development cartridge having a switch member to rotate developing unit to a development position

A development cartridge, comprising:

• a photoconductive unit including a photoconductive drum;
• a developing unit including a developing roller having a rotation shaft and coupled to the photoconductive unit to be rotatable to a release position where the developing roller is separated from the photoconductive drum, and to a development position where the developing roller contacts the photoconductive drum to form a development nip;
• a coupler located between and couplable to the rotation shaft of the developing roller and a rotational power transmission member, such that when the coupler is coupled to the rotational power transmission member, the coupler is selectively rotatable in a first rotation direction or a second rotation direction by a rotational force from the rotational power transmission member, and when the coupler is rotated in the first rotation direction and then a part of the rotational power transmission member is rotated in the second rotation direction, transmission of the rotational force to the developing roller is temporarily stopped;
• a switching member mounted on the rotation shaft of the developing roller to be rotatable about the rotation shaft of the developing roller by being coupled to a second coupler, wherein the switching member includes a driving gear having a rotation axis and provided to be rotatable about the rotation shaft of the developing roller by being coupled to the second coupler,
• wherein the rotational force is provided to the rotational power transmission member by the driving gear, the rotational power transmission member to transmit the rotational force of the driving gear to the coupler when the driving gear rotates in a first driving gear direction, corresponding to the first rotation direction of the rotational power transmission member, and to block the rotational force of the driving gear to the coupler when the driving gear rotates in a second driving gear direction, corresponding to the second rotation direction of the rotational power transmission member.

A development cartridge, comprising:

• a photoconductive unit including a photoconductive drum;
• a developing unit including a developing roller having a rotation shaft and coupled to the photoconductive unit to be rotatable to a release position where the developing roller is separated from the photoconductive drum, and to a development position where the developing roller contacts the photoconductive drum to form a development nip;
• a driving gear, rotatable about an axis of rotation of the rotation shaft of the developing roller;
• a power transmission member;
• and
• a bush, disposed between the rotation shaft of the developing roller and the power transmission member, and coupled to the rotation shaft of the developing roller, and
• when the driving gear rotates in a first direction, the power transmission member is to transmit a rotational force of the driving gear to the bush, and
• when the driving gear rotates in the second direction, a part of the power transmission member is to temporarily stop the rotational force of the driving gear from being transmitted to the bush, so that the bush does not rotate and transmission of the rotational force to the developing roller via the bush is temporarily stopped.