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TECHNICAL GUIDE
II.
REFERENCE
How to wind the main spring
• Manual winding mechanism
By turning the crown clockwise while the winding pinion
and sliding crown wheel engage with each other (while
the crown is at the normal or first click position), the
rachet wheel will turn intermediated by the sliding
crown wheel, thus winding the mainspring. By turning
the crown counterclockwise, however, the crown wheel
will be disengaged from the sliding crown wheel, and
the mainspring will not be wound. The crown wheel
and sliding crown wheel are also disengaged when the
mainspring is wound through the automatic winding
mechanism.
• Automatic winding mechanism
Regardless of whether the oscillating weight turns
clockwise or counterclockwise, the differential wheel
and pinion keeps the wheels turning only in one fixed
direction so that the mainspring will be wound as the
oscillating wheel turns.
Oscillating
→
First reverser
weight with
ball bearing
Second
reverser idler
First
→
reduction wheel
and pinion
Second setting device
When the crown is pulled out to the second click, the pin at the end of the train wheel setting lever
presses down the balance complete with stud, thus stopping the hands.
Upper
→
differential
idler
wheel
↓
Lower
→
differential
wheel
Second
→
→
reduction wheel
and pinion
Balance complete
with stud
Rachet wheel
Sliding crown
wheel
Crown wheel
→
First reverser idler
Second reverser idler
→
Rachet wheel
Normal position
Click
Sliding crown
wheel spring
Winding pinion
Oscillating weight
Oscillating weight
with ball bearing
Differential wheel
and pinion
Rachet wheel
Complete barrel
with mainspring
Train wheel setting
lever spring
Train wheel setting
lever
Second click
Cal. 4S77A
First reduction
wheel and pinion
Second reduction
wheel and pinion
13
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