Image forming device for electrostatic recording apparatus having a slidable replacement holding case

Claim 1

An image forming device for electrostatic recording apparatus which has a plurality of replacement units including a photosensitive drum, and a case housing replacement units and integrally removable from the device body by sliding said case toward one direction, and wherein each of said replacement units is placed in operable position when said replacement unit holding case is set to a given position in the device body, wherein: said replacement unit holding case is provided with means for automatically changing the position of each of said replacement units further away from each other, than the given setting position of each of said replacement units by pulling out said replacement unit holding case; and said replacement unit holding case is provided with a photosensitive drum holding mechanism consisting of; a socket having an outer cylinder provided with trunnions fitting into a bracket attached to the inside face of a front plate of said replacement unit holding case, and rotatable around the horizontal axis lateral to the pulling-out direction of said case, and having an inner cylinder provided with a bottom plate for prevention of its working out slidably fitting into the inside of said outer cylinder, being energized in a direction projecting from the inner cylinder toward the inserting direction of the case by a spring disposed between the bottom plate of the outer cylinder; and a journal portion constituting a cap fitting into the inside of said inner cylinder in said socket slidable axially and rotatable around the axis, and pressure fitting on the one-side shaft end of said photosensitive member.