Olympus OM-1 Repair Manual page 36

B—15
High Speed (i/60 -*1/1000)
There is constantly a force by Tension Spring (8599) trying to make
various parts work in such an order as (8527)-8538-(8537)-(8506)-8519-
(8547). When 8592 is released as a result of mirror lifting, it releases
8547. Then the first curtain starts moving and (8506) rotating as
(8527) is rotated by the force from (8530).
The interval between curtains, i.e. how soon the second curtain should
start after the first curtain, is controlled as follows. 8547 clinched on
the Gear A rotates in unit with the Gear A, and pushes out 8551 to let
the back of 8551 release 8563. It will rotate (8548) and start the second
curtain.
The shutter speed adjustment for 1/60 - 1/1000 is made by 8577 engaged
on the shutter dial. When it is set at the desired speed between 1/60 -
1/1000, it will determine the position of 8576. Through 8559 connected to
8576 it will further determine the position of 8551. (When released, 8551
returns to its original position.)
Low Speed (1/1 - 1/30)
Since the mechanism of the first curtain operates in a same manner as
in case of a high shutter speed, the exposure time is adjusted by
controlling the timing after the start of the second curtain until the
moment the Patch of the second curtain appears in the wash. The
control is performed by the governor.
1/1 1/2
When the shutter dial is set at l/l or 1/2, it will determine the position
of 8577 engaged onto the shutter dial. It will further set the position
of 8605 screwed with 8577. The A lever is dropped into the concave of
8605 and the Large Ankle is engaged. The speed adjustment of 1/1 and
1/2 is made by the Cam lever connected to 8575. The Cam lever will
determine the position of the G lever and thus change the angle of
operation of the Governor to adjust the speed. (Ref. E -29 )
Now the preparation of speed adjustment for 1/1 or 1/2 is completed.
After the first curtain run, 8563 is released. When the Gear B (second
curtain) starts moving, the boss on the Gear G hits the G lever on the
governor. After its operation for appropriate time on the governor,
the boss on the Gear B is released from the G lever. This removes the
Gear B load and the second curtain runs in a high speed. (The position
of 8551 will be the same as in the case of 1/60.)
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