A coupling apparatus, a development cartridge, and an electrophotographic printer
having the coupling apparatus. The coupling apparatus transfers a rotation force
in a connected state. The coupling apparatus has a first coupler having a cylindrical-type
connection portion at an end and a spiral rib spirally protruded at an outer circumference
of the connection portion; and a second coupler having a circular-type main hole
depressed at an end corresponding to the connection portion, and a spiral groove
formed at an inner circumference of the main hole corresponding to the spiral rib.
The connection portion and the spiral rib are relatively connected with the main
hole and the spiral groove by being pressed, and transmit a rotation force by being
rotated together.
