Bell & Howell - Projector - Filmosound 641 - 642 ... - Cine Information

the bearing (28) and trigger (29) to the
bearing assembly*
Note - When assembling Design 641 projectors,
only the cam (39) and worm gear
with the hub and setscrew (35 and 36) are
installed on the camshaft* Actual camshaft
installation procedure is the same.
d. (642 only). Apply a light film of
grease to' the bearing hole in the cast arm
of the mechanism housing and insert the
unthreaded end of the camshaft through the
bearing hole. Install the cam (39), washer
(38) and assembled worm gear parts (stepc)
over the end of the camshaft. Assemble
the spring (24) over the hub of the driven
clutch (25), spreading the legs of the spring
so that they straddle the bent ear of the
clutch. Insert the hub of the driver clutch
(23) into the hub of the driven clutch,
spreading the legs of the spring still
further until one of the lugs of the driver
clutch is straddled. Install the washer (27)
and assembled clutches onto the camshaft.
The driver clutch must fit over the flats of
the camshaft in such a manner that the
bent ear of the driven clutch is parallel
with the flat for the loop restorer cam (39).
e. (642 only). Insert the free end of
the camshaft into the bearing (22) and
press the camshaft in place until the
bearing (41) is seated. Install the two
retaining rings (26). Check to make
certain that the actuating ear of the clutch
yoke (31) extends past the inside edge of
the strike (16). Adjust by bending this ear
as necessary.
f. Secure the bearing loading spring
(20) with screws (19). Install the large
retaining ring (18) over the camshaft and
into the groove in the housing. The convex
side of the retaining ring must be against
the bearing.
g. (641 and 642). Insert a 0.15 inch
feeler gauge between the loop restoring
cam (39) and the cast arm of the mechanism
housing. Press against the cam to
hold the feeler gauge against the cast arm,
22
and tighten the setscrew (21) against the
flat in the camshaft. Remove the feeler
gauge. Screw the rewind adjustment stud
(45) down into place so that the top of the
stud is approximately l/l6 inch below the
surface of the housing.
31. REASSEMBLING THE MECHANISM
(Figure 12)
Note - The clutch parts (36) to (45) are
used only in the Design 642 projector.
When servicing 641 projectors, disregard
reference to these parts.
a. Assemble the bearing support (12)
to the shuttle arm plate (33) so that the
nylon pads face one another. Thread in
the support to the full length of its thread.
Install the framer knob and shaft (35) so
that the prongs of the shuttle arm plate
framing arm can be engaged with the
groove in the framer shaft. Secure the
plate (33) to the cast arm of the mechanism
housing with screws (30), washers (31) and
round nuts (32). The flatted portion of the
nuts (32) must fit into the notches of the
plate.
b. Assemble the in-out cam (23) to the
in-out bracket assembly (24) so that the
nylon pad of the cam follower (28) will
ride against the polished surface of the
cam. Install this assembled group over the
end of the camshaft and fasten the bracket
assembly to the mechanism housing with
two screws (21) and washers (22).
c. At this point, refer to Figure 11
and install the aperture plate (15) with the
screws (14). Adjust the aperture plate as
instructed in paragraph 42, step'a 9 . Then
return to Figure 12 and continue with the
reassembly procedure.
d. Check the ball and stud assemblies
(18) to make certain that the locking hexagon
nuts (17) are tightened. Press the
link bearings (14) into the notches at the
front of each shuttle arm. Assemble the
cam followers (16), burr side down, into
the notched centre section of each shuttle