Abstract: The present invention relates to a process cartridge removably mountable on an image forming apparatus comprising a support, a rotary member having an image bearing surface and rotatably supported by the support, and a rotatable developing roller supported by the support, for carrying developer thereon and supplying the developer to the image bearing surface to develop a latent image formed on the image bearing surface. A first gear is arranged coaxial with the rotary member, a second gear is arranged coaxial with the developing roller and meshed with the first gear, and a guide means is provided for guiding the developing roller in a direction toward and away from the rotary member. The direction in which the developing roller is guided by the guide means is inclined with respect to a straight line connecting the center of rotation of the rotary member to the center of rotation of the developing roller, by an angle between 0.7.times..THETA. (.THETA. is a pressure angle of the second gear) and 1.3.times..

Abstract: A portable image forming apparatus includes a photosensitive member, image forming device for forming an image on a recording medium using the photosensitive member, a battery for supplying power to drive the image forming device, a guiding member for guiding the recording member, the guiding member being swingably mounted to a frame of the apparatus adjacent an end thereof and being movable between a guiding position wherein the opposite end of the guiding member is away from the frame and an accommodating position wherein the opposite end is close to the frame, and a battery accommodating portion for accommodating the battery, the accommodating portion being provided with an openable cover, wherein the guiding member is overlaid to the cover when it takes the accommodating position.

Abstract: An apparatus for releasably and adjustably mounting a specimen in an electron microscope. A specimen-holding unit is releasably and fluidtightly mounted in an evacuatable chamber and abutting the lens of the electron microscope in the mounted position. The unit is held in place by the pressure differential between the chamber and the atmosphere when the chamber is evacuated. The specimen-holding unit comprises a rotatable specimen-holding shaft disposed eccentrically within a rotatable support member. The specimen is variably positioned under the electron beam by the rotation of the member and the rotation of the shaft with respect to the member.