WatchTech

hello~~ everybody.~~

i have something(idea)  to share with people who like the watch.

actually i have a idea,  but i am not sure that is good or bad.  

there is nobody who i can ask...... 

at first i am sorry that my bad English.

the idea is the way to control the torque.

there is watch that has long power reserve.  7days, 10days, or 30day.....

long power reserve watch has big and strong main spring(barrel).

sometimes strong barrel make the problem. ---- knocking and no stable(isochronizm).......

so i think the system to control the torque.  i mean....

if the torque is too high(fully winded), make it decrease(the torque).

when the torque is getting low, make it increase(the torque).

i am not good at English. so let me explain by drawing......

for example, there is 100days power reserve watch.  you can see the drawing, and there is power reserve indicator.


  (drawing is just for explain, something is wrong.! pinion size....)

there is friction spring(B), this spring touch the wheel pinion(C).

there is special part(A).  this is a eccentric lever. the movement is same with power reserve hands.

 this drawing explain fully winded situation.



 this drawing explain NO winded situation. 

 

when fully winded, torque is high---------make friction high(spring"B" touch pinion)----------make torque low

then 10days later,  20days later, 50days later,-----torque is getting low-------friction getting low-------torque is not big change!!!!

i am not sure that you understand what i say.....  i am sorry that my English...

i really want to ask......

  Have you ever seen same system or similar    ?????????????????

  what do you think about this system..   good or bad...????????????

thank you very much for read ..

it would probably take much experimentation to discover the right friction and the curve of the cam which reduces that friction on the pinion.

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Search for "stackfreed" mechanism. However, I believe this is more appropriate for the past when metallurgy for hairspring technology etc are limited, so constant torque was more important to achieve isochronism. Today in modern world, it is not as big a problem.

I see a stackfreed mechanism as adding unnecessary load to a movement. To me, a rementoir or fusee-chain is a more elegant solution but more complex.

Regards,
skyeriding

i have experience.....this days... there is many watches(manual winding) which has long power reserve, 8 or 10 or 15 days......
when the watch is fully winded, there is knocking problem. there is problem very often.!!!  (automatic watch also has same problem)
watch brand say---- about 1 hour knocking is OK....they say 1hour koncking make rate fast about 15~20second per week !!!
but many customer like touch the crown, it mean customer winding many time------winding every day-----knocking problem come everyday~~~
it make me start to think ----- how to make NO knocking problem when fully winded.
at first i studied about fusee system. but if i use fusee, the movement will be very thick!!!! and high cost....

i am very thank you for tell me "stackfreed mechanism" i agree it is similar with my idea..

but i think it is not same~~~
when i think my idea, i want to use friction spring for NO shaking second hand and power reserve system.
because it is easy to find watch which has friction spring for NO shaking second hand.
              it is easy to find watch which has power reserve system
i can use existing parts and i can use existing system......it mean NO high cost.!!!

last ..... all that i say is just my opinion, and i am not sure right or not.

If you use the friction spring on the seconds hand, it is a known solution to prevent "flutter" of seconds hand (no shaking).
However, the second hand in a watch geartrain is heavily geared up - When mainspring power is high torque but low speed, the geartrain reaches the seconds hand as low torque, but high speed.
To apply friction spring to this second hand *exactly* with good tolerance so that it can adjust mainspring resistance is therefore, very difficult due to high precision needed. The friction spring will work better on the mainspring, which is a high torque but low speed part so fine-tuning adjustment is much easier (I hope you can understand what I mean...)
Regards,
skyeriding

I can understand what you said.~~ and i agree with you.!! You can check first drawing, friction spring not touch the second wheel, it touch the 3rd wheel, i think friction spring can be touched at great wheel(2nd wheel).....
I just want to make friction spring which is controled by power reserve system....!!!
Thank you for your advice and i will try study more.~~

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Credit: Richard Mille

Best wishes

Alkiro

It seems like the click is the most logical component to register varying pressure from the barrel without affecting the rest of the train.

as shown by the old stackfreeds which were more or less exactly what you suggest.
The main problem with the system is that you are adding friction to reduce the torque that gets to the escapement when the barrel is highly wound.  You reduce this friction as the barrel winds down.  But this friction means energy lost and reduced autonomy, reduced the power reserve.
Any of the many different constant force systems used these days is a better solution as less energy is lost to friction. thus increasing the power reserve.
There are several good articles to be found about, for example, the Lange 31 and the mechanism used for its 31 day power reserve.
Check them out.
Don

You are right.!!~~ It is very similar with "stackfreed". But .... not exactly same.!! This idea was started by knocking problem.! I just want to reduce over torque which make knocking.! Because it is very easy to find knocking problem some calibre..!!
And can i ask one.??? I understand what you said about "energy lost"
i want to make reduce over energy !!
Could you tell me about "reduce autonomy" and "reduce power reserve"
I can not understand ...... please tell me ..... let me study more.~~~
Thank you very much

And it's look like this:

I think, that with friction alone it would be impossible to limit the torque with sufficient accuracy