Lamp-adjusting mechanism, particularly for photographic enlarging apparatus

Claim 1

An adjustable light source for a photograhic projector apparatus having a condenser illuminating system, comprising a condenser having an optical axis, a lamp having a characteristic profile, a holder within which the lamp is mounted, a housing, a longitudinal separating wall disposed within the housing whereby the housing is separated into longitudinal traversing mechanism and lamp-containing compartments, longitudinal traversing means being mounted in the longitudinal traversing compartment, the longitudinal traversing means comprising substantially parallel lead screw and guide rod mounted longitudinally parallel to each other in the longitudinal traversing compartment, a nut is connected to the holder and operatively engaged with the lead screw for longitudinally traversing the holder and light source towards and away from the condenser when the lead screw is rotated, a tilting control rotatably mounted on the housing, eccentric connecting means coupling the guide rod to the tilting control whereby rotation of the tilting control imparts an arcuate movement to the guide rod relative to the lead screw whereby the holder is adjustably angularly tilted relative to the lead screw, a slot in the separating wall, the lamp holder being disposed through the slot with one end thereof connected to the lead screw and guide rod and the other end thereof being disposed in communication with the lamp-containing compartment, resilient light sealing means mounted on the separating wall alongside the slot whereby light from the lamp is prevented from passing through the slot into the longitudinal traversing compartment and whereby the tilting movement of the holder is accommodated to permit the position of the lamp relative to the condenser to be precisely adjusted.