Factory Tips

escapement) is hooked behind the
pallet cam follower. Replace the pivot
screw and hook the pivot spring.
Now, to adjust the pivot screw, hold
the speeds escapement against its
spring tension — away from the speed
control cam stack. Tighten the pivot
screw until the speeds escapement
cannot move toward the speed control
cam stack under its own tension.
Then, back off the pivot screw until
the speeds escapement does swing
into contact with the speed control
cam stack.
Test your adjustment by pushing
down on the speed control bridge at
the point marked "X" in Fig. 15. The
speeds escapement should still move
freely while you're exerting pressure.
If it doesn't, slightly back off the pivot
screw. Finally, reseal the pivot screw
to hold your adjustment.
Slit-Width Adjustments
Since we mentioned the slow-speed
adjustment, let's look at the slit-width
adjustment at the back of the camera.
The slit-width adjustment is the
eccentric post on the closing curtain
latch, Fig. 17.
Say that you've just released the
shutter at one of the slit-width speeds.
You know that the opening curtain
starts across the aperture, but the
closing curtain is held back by the
closing curtain latch. It's up to the
opening curtain to disengage the
closing curtain latch at the proper
time for the desired slit width.
The part that disengages the closing
curtain latch is the disengaging lever,
Fig. 17. And the disengaging lever is
controlled by the release cam, a cam
that spins with the opening curtain
drum. So, once the opening curtain
has traveled a sufficient distance, the
release cam strikes the disengaging
lever. The disengaging lever, in turn,
strikes the eccentric post on the
closing curtain latch and frees the
closing curtain.
Turning the speed selector to the
different shutter speeds positions the
disengaging lever — that's how the
speed selector changes the release
point of the closing curtain for
different shutter speeds. From the
front of the camera, Fig. 16, you can
see the end of the disengaging lever
that rides against the high-speed cam.
The eccentric post on the closing
curtain latch is the adjustment point
for all the slit-width speeds. Turning
the eccentric post to correct 1/500
second and 1/250 second should bring
PALLET CAM FOLLOWER
1/1000 SECOND CONTROL SECTION OF HIGH-SPEED CAM
Figure 16
DISENGAGING LEVER
SLIT-WIDTH ECCENTRIC
Figure 17
LATCH WHICH LIMITS THE FORWARD TRAVEL OF
THE WIND GEARS ON THE COCKING CYCLE
LATCH WHICH PREVENTS
SPROCKET BACKLASH
ONE-WAY CLUTCH
FOR WIND STROKE
Figure 18
DISENGAGING LEVER
CLOSING CURTAIN LATCH