Seiko 6138A - Chronograph Operation; Stopping Minute and Second Hands; Starting Minute and Second Hands; Hour Hand Operation

6f
3BA
Operation
of Chronograph
Meehanism
Stopping of chronograph minute
and second hands
Clutch
ring
Coupling lever
Fourth
wheel
(idle)
Center chronograph
wheel axle
(does
not rotatel
Stopping
The minute
and second record-
ing wheels
are
stopped
when
the
Fis'
15
clutch
ring is raised
through action
of the
coupling
levers. The hour
recording
wheel comes
to a halt by
a
slip
of
the
hour recording
friction
spring
of the
barrel.
The slip comes
from
the fact
that the hour record-
ing
wheel stop
lever
brakes
the
hour
recording
wheel
by
the spring
for
hour recording
wheel
stop lever.
→
Stopping of chronograph
hour
hand
Hour
recording wheel
Hour recording
Starting
of chronograph
minute
and
second hands
tf\-
(Rotates
as
one
unitl
Fis. 16
Starting
The minute
and second record-
ing wheels
are started
when the
coupling
levers
are separated
from
the clutch ring.
Simultaneously,
the
second
coupling
lever
pushes
the
intermediate
hour recording
wheel
stop lever
pin,
revolving
the inter-
mediate hour recording
wheel
stop
lever
in the
-
direction.
And then.
the force of the spring
for
hour
recording wheel
stop lever
is not
transmitted to the
hour recording
wheel
stop lever
to release
the brake
of the hour recording
wheel
and let
it start.
Intermediate
hour
recording
wheel
stop
lever
Spring
for hour recording
-
wheel
stop lever.
Starting of
chronograph hour hand
‑6138A‑7‑
recording
wheel
stop lever
pin
Second
coupling
lwer