Film holder for dental X-ray film developing machine, and film mounting stage for the holder

A film mounting stage for mounting a film on a film holder for a dental X-ray film developing machine in which the film holder with a film mounted thereon is brought into engagement with an arm attached to a rotary shaft and development of the film is conducted while the rotary shaft makes a full turn, said film holder comprising a stem portion having opposite ends, an engagement portion formed at one end of the stem portion and engageable with the arm and a film-mounting portion composed of two support portions formed at the other end of the stem portion and extending out in an opposing relationship from the stem portion;

• and plural film-mounting projections are provided at different levels in the direction of a thickness of the film holder in the proximity of each of a free end portion of the respective support portions and a base portion of the respective support portions, whereby the film can be placed between the support portions while being held between the film-mounting projections, said film mounting stage comprising a wall for placing the film thereon and film pressure extending from individual peripheral edges of the wall in corresponding to the respective sides of the film and defines a film-holder-receiving recess having substantially the same shape when viewed from above as the film holder and a bottom wall located lower than the wall.