Nikon Labophot Repair Manual

R.4104.A
MECHANISM ANO PRINCIPLE
1. Coaxial Coarse and Fine Focus Unit
MECHANISM ANO PRINCIPLE
1. Coaxial Coarse and Fine Focus Unit
Fig. 24
1) Transmission of turning force of fine focus knob
e Tuming force of the fine focus knob ( C@D or @> is transmitted to the pinion
shaft (
(@) to move the rack (®) vertically through the gear system (@ , @ ,
@.@. ®· @,@, @, @),@).
e ln this transmission with such a reduction ratio as from @ to @ , the weight of
the
stage and substage, which exerts force to rotate @ , is overcome by the friction
offered by spring
(e[!])) to the sliding surfaces of @ and @ .
e Thus, even though some backlash is provided for each gear to enable smooth gearing,
almost
no slack will be seen in the rising and lowering directions of the stage, by
virtue of the rotation force of the gears work.ing in one direction under the wetght of
the stage.
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Nikon Labophot Specifications

General

Illumination	Built-in transmitted light, halogen lamp
Stage	Mechanical stage with coaxial controls
Focus	Coarse and fine focus knobs
Observation Methods	Brightfield, Phase Contrast
Condenser	Abbe condenser
Power Supply	AC 100-240V, 50/60Hz