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Any typos are as a result of direct translation of the
original French.
In one simple day of the month, at the end of the month not comprising 31 days,
it is essential to carry out a correction on star of 31.
Moreover, it is useful to place some on other stars, for the moment or one will
make a restarting of the watch after a stop of several days of the latter.
The correction is carried out using a pointed tool on "poussette"
adjusted freely in the breadth of limps, or on a correct push rod driven out in
the breadth of limps.
Operation:
If for example, one wishes to advance manually star 31, one presses on
corresponding "poussette", at the point indicated by the arrow; this
one operates the corrector; the tilted I of the corrector comes into contact
with the point of the tooth 31', it obliges star 31 to turn in the direction of
the arrow; the tooth 31"goes up on the tilted one of the saltire, crosses
the top of the saltire to take the position represented by the figure of
right-hand side.
Then, as soon as that poussette is released, under the action of his spring, the
corrector is brought back behind; he releases star and tilted saltire, acting on
the point of the tooth 31", leads star until its new home position.
The tilted ones of the saltire rest again against two points of teeth, but the
star has advanced "of a step".
Note:
To function correctly, the tilted I of the corrector must advance sufficiently
star so that the point of the tooth 31"crosses the top of the saltire, if
not, when poussette is released, the retrograde star.
When the star with can of teeth (7 teeth, for example), the corrector must, to
ensure the advance of a tooth, to make traverse with star a more significant
way.
This is why the end of the corrector does not end any more by two tilted, but by
only one or a curve.
Duration of the jump of stars.
In one day of the month, it runs out a certain time since the moment when the
disc (or switches it) starts to be actuated, until the change is operated.
The advance of the needle or the disc is initially slow, it is the moment or the
tooth assembles the tilted one of the saltire, until it reaches the top.
The second part: the "jump" of the needle is fast, it corresponds to
the moment during which the other tilted of the saltire leads the tooth of star
until its home position. The duration of the changes is not the same one for all
stars.
The principal factors of changes are:
The
step of the teeth of the star (little numbered star, very large diameter).
The
length of the finger.
The
slope of tilted of the saltire.
Safety devices during a correction.
In one usual day of the month, one should not actuate stars manually, by means
of the correctors, when the needles of the watch are "with the
surroundings" of midnight, if not the teeth of star can come into contact
with the finger or the pin fixed on the intermediate gear.
It results from it sometimes from the rather serious disturbances (pins folded
or broken, distorted teeth, etc).
Various patents were taken for devices avoiding any disturbance when stars
manually are actuated, with the "surroundings of midnight".
Examples of various systems of safety.
Finger adjusted freely on the wheel and
pulled by a pin. |
Blade arises pulled by a pin. |
Pawl functioning under the effect of a spring and
positioned geometrically
by a pin (the pawl C swivels in X). |
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Days of the month with "instantaneous jumps"
In certain days of the month, by a special device, the automatic changes of the
date and day of the week take place abruptly; the stars advance "step
quickly", exactly at midnight.
Terminology:
| With |
Coil hours or coils entraîneuse day of the month. |
| B |
Entraîneuse wheel of day of the month. |
| C |
Disc. |
| It |
Cam. |
| C '' |
Saltire. |
| 31 |
Star of day of the month. |
| B and C |
Fingers (of the days and day of the month). |
| 7 |
Star of the days (or of 7). |
| E |
Saltire of day of the month. |
Operation:
For all the length of time which precedes the change by date, the saltire
"goes up" and is armed on the cam until the high part of the latter.
At midnight, the saltire falls on the low part of the cam and violently actuates
it in the direction of the arrow, the fingers take part in this movement and
actuate their respective star.
One day of the month modern example to instantaneous jump.
Operation:
The finger of day of the month (image of left and green part on the image of
right-hand side) is interdependent of the wheel of day of the month (drivage or
shore).
The finger of day of the month comes into contact with a tooth of the disc,
which is positioned by a saltire (colored in red image of right-hand side).
The wheel of day of the month continues to turn, the saltire being stronger than
the finger, this last is armed and the back part will approach until the moment
when the two parts (in red) will be touched.
As of this moment, the finger will involve the disc until the moment when a
tooth of this one will have entirely gone up the tilted plan of the saltire,
consequently, the jump of the disc will be able to be carried out and indicate
the next day.
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