Direction Of Shifting Operation - Kodak Instamatic M Series Repairing

Direction of Shifting Operation

Because the motor turns the shutter-drive shaft in the same
direction at a constant 54rps at all times, shifting from
forward to reverse involves changing the phasing between
the up-and-down cam (on the shutter-drive shaft) and the
in-and-out cam (driven by the shutter). Remember that the
shutter and the shutter-drive shaft can rotate and slide
relative to each other.
In the super-8 Forward running position, the cam dog
drives the long shutter lug (Fig. K12 and Fig. K15) and the
pulldown claw enters the film perforations at the start of
the down stroke.
Shifting direction: the directional shift lever pushes
against the shutter-drive shaft and moves it and the drive
dog to the left, Fig. K13, closer to the shutter and pinion
assembly.
The cam-drive dog is now disengaged (Fig. K13 and Fig.
K16) from the shutter assembly and is free to rotate
relative to it.
The cam-drive dog rotates 180° until it reaches the short
shutter lug, Fig. K14 and Fig. K18. This is the super 8
Reverse running position. The pulldown claw enters the
film perforations at the start of the upstroke.
To change direction again, the directional shift lever
releases the shutter shaft, and a
spring moves the shutter-drive
shaft and drive dog back to the
right; the cam-drive dog is free to
rotate 180°until it again engages
the long lug and this again is the
super-8 Forward running position.
In the regular-8 Reverse running
position, the cam dog drives the
long shutter lug, Fig. K12 and Fig.
K15, and the pulldown claw enters
the film perforations at the start of
the upstroke, Fig. K11.
Shifting direction: the directional
shift lever pushes against the
shutter-drive shaft and drive dog
and moves it to the left.
The cam-drive dog is now disen-
gaged, Fig. K13 and Fig. K17,
from the shutter assembly and is
free to rotate relative to it.
The cam-drive dog rotates 180°
until it reaches the short shutter
lug, Fig. K14 and Fig. K18. This
is the regular-8 Forward running
position. The pulldown claw
enters the film perforations at the
start of the downstroke.
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To change direction again, the directional shift lever
releases the shutter-drive shaft and drive dog, and a spring
moves the shutter-drive shaft back to its original position;
the cam-drive dog is free to rotate 180°until it again
engages the long lug and this again is the regular-8
Reverse running position.
FIG. K12
FIG. K15
FIG. K17
41/KODAK M-SERIES PROJECTORS
FIG. K13
FIG. K16
FIG. K18
FIG. K14