Device for positioning movable reflector of optical system of electrophotographic copying apparatus

A device for positioning a movable reflector having a reflection surface and of an optical system of an electrophotographic copying apparatus including a lens and a plurality of reflectors, at least one of said reflectors being movable between an operative position in which said movable reflector is disposed in an optical path and obstructs the normal optical path from another fixed reflector and in an inoperative position in which said movable reflector is out of the optical path, said device comprising:

• a reference plate;
• means for securing said movable reflector thereto;
• a bracket supporting said reference plate;
• a housing for said bracket;
• means pivotally mounting said bracket on said housing;
• a plurality of positioning stoppers on said housing for positioning said movable reflector;
• and
• a plurality of reference surfaces on said reference plate, each of said reference surfaces being machined to the same level, some surfaces being in contact with the reflection surface of the reflector and each of the other surfaces being brought into contact with one of said positioning stoppers in a predetermined position when said reflector is in its operative position.