Abstract: A rotating part for an image forming apparatus includes a drive member for transmitting power; and a driven member that is rotated by the drive member. The drive member has a male part formed in a direction of a rotation axis, and the driven member has a female part that is formed in the direction of the rotation axis and into which the male part is inserted. The male part is a hexagonal male part whose cross section perpendicular to the rotation axis assumes a hexagonal shape. The female part is a twisted triangular female part that assumes a triangular cross sectional profile in a direction perpendicular to the rotation axis, and a triangle which forms a cross section of a base and a cross section of a top is twisted at a predetermined angle with respect to the rotation axis.

Abstract: A rotating part for an image forming apparatus, including: a drive member; and a driven member, wherein either of the drive member and the driven member has a male part formed in the direction of a rotational shaft, wherein the other of the drive member and the driven member has a female part formed in the direction of the rotational shaft, and wherein the male part is a ratchet-shape male part to be inserted into the female part and in which when the drive member rotates in a first direction, the male part is brought into engagement with the female part to thereby transmit power from the drive member to the driven member, while when the drive member rotates in a second direction opposite to the first direction, the male part and the female part move away from each other to thereby transmit no power.

Abstract: A rotating part for an image forming apparatus includes a drive member for transmitting power; and a driven member that is rotated by the drive member. The drive member has a male part formed in a direction of a rotation axis, and the driven member has a female part that is formed in the direction of the rotation axis and into which the male part is inserted. The male part is a hexagonal male part whose cross section perpendicular to the rotation axis assumes a hexagonal shape. The female part is a twisted triangular female part that assumes a triangular cross sectional profile in a direction perpendicular to the rotation axis, and a triangle which forms a cross section of a base and a cross section of a top is twisted at a predetermined angle with respect to the rotation axis.

Abstract: A rotating part for an image forming apparatus, including: a drive member; and a driven member, wherein either of the drive member and the driven member has a male part formed in the direction of a rotational shaft, wherein the other of the drive member and the driven member has a female part formed in the direction of the rotational shaft, and wherein the male part is a ratchet-shape male part to be inserted into the female part and in which when the drive member rotates in a first direction, the male part is brought into engagement with the female part to thereby transmit power from the drive member to the driven member, while when the drive member rotates in a second direction opposite to the first direction, the male part and the female part move away from each other to thereby transmit no power.

Abstract: An electrophotographic photoreceptor comprising an electrically conductive support and at least a carrier generation layer and a carrier transport layer formed on the substrate, wherein said carrier generation layer contains a polyester resin having a repeating structural unit of the following formula (I): ##STR1## wherein each of R.sup.1 and R.sup.2 is an alkylene group which may have a substituent; each of R.sup.3 and R.sup.4 is a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, or R.sup.3 and R.sup.4 may together form a ring; Ar is an arylene group which may have a substituent; each of Ar.sup.1 and Ar.sup.2 is a phenylene group which may have a substituent; and each of m and n is from 0 to 10, provided that m and n are not simultaneously 0.