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

Disassemble parts shown in Figures 42
-45 in their indexed order and note the
following precautions.
When the actuating assembly (13/
Fig.44) is removed/ observe the setscrew
protruding up from the casting immediately
below the mounted position of the
actuating assembly. The height of this
setscrew above the casting has been set
to ensure that the auto-threading system
does not lock when the actuating assembly
is depressed. Do not disturb this setscrew.
Before disassembling/ make a careful note
of the manner in which the various springs
(9/ 15/ 18 and 44 Fig.45) are installed. It
is important that these springs be reassembled
in the same manner.
Removal of parts in this illustration will
necessitate the re-adjustment of the autothreading
mechanism as described later.
REASSEMBLING THE MECHANISM (Figure 45)
Install lens stop screw (67) into the housing
casting until only one thread is visible.
Attach lens carrier catch (65) and spacer
washer (66) to casting with screws (63) and
lock washer (64). The stop screw and catch
will be adjusted after lens carrier is installed.
Secure the connecting link (60) and shuttle
retractor (59) to the casting with screw (56)
and washers (57 and 58).
Attach self-centering assembly (55) to rear
of casting with screws (52) and washers (53 and
54). Assemble lever and shaft assembly (51)
to casting and install washer (42) and
arm assembly (50) on shaft. Tighten screw
(49).
69
Assemble cam follower parts (48) and
fasten to the arm assembly (50) with screw
(45) and washers (46 and 47). Attach
spring (44) to casting and hook loose end
of spring over shaft of lever assembly (51).
Assemble upper loop form shaft (68) to
casting and install washer (42) and upp
loop form (41); tighten setscrews (35).
Install upper sprocket guard plate (40).
Assemble lower loop form (38) so that
loop form shaft passes through guard plate
and casting while upper stud of connecting
link passes through holes in upper loop
form. Install retaining ring (37) on
connecting link stud and the threading
lever (36) on end of loop form shaft.
Secure the threading lever with setsc m
(35).
Install spring (34) so that it supplies return
tension to shaft (68).
Assemble toggle lever (31) to lower
sprocket guard plate (28) with retaining
ring (30). Fasten guard plate to casting
screws (27). Install upper film guide (29)
large washer (25) lower film guide (26]
and a second large washer (25) over lower
bearing protruding through sprocket guard
plate (28). Note that the lower stud of
the connecting link (60) must pass throug
a hole in the left ear of the lower film
guide. Spring (15) and lower loop form
(14) are then installed on this stud an '
secured with retaining ring (13). Leg.
of spring (15) must be positioned to apply
proper tension to lower loop form. Install
large retaining ring (24). Fasten backup
bracket (23) to sprocket guard plate.
Attach auto-thread locking lever (21)
and eccentric pivot (20) to casting with
screw (19). Attach release spring (18)
and bushing (17) to casting just above
and to the left of lever (21)/ hooking
long leg of spring behind the rear edg'
of lever/ and handle assembly (8) and
spring (9) with retaining ring (7). Install
all rollers.