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Hi, can you explain exactly what is meant by decoupled action (meccanica slegata) and what linked action (meccanica legata) means?
If I understood correctly, the Herz-type action is linked action? What advantages/disadvantages does it give?
If I understood correctly, the Enrad-type action is decoupled action? What advantages/disadvantages does it give?
What is the return spring in an action, can you show me a photo to understand?
Thank you
Denis
Moderator
that one cannot do a course in writing. Anyway, the linked action is a solution from the past, specifically of some Bechstein pianos. The two types of spring have the same purpose and effectiveness
Member
Excuse me, but just tell me if my intuition is correct: I noticed that in models of the key section of a grand piano, such as Renner, there is sometimes a spring between the key lever fulcrum and the key (see your video on friction). In other cases, that spring is not there. Is this, then, the tangible difference between tied and untied mechanics?
Thank you, sorry for the disturbance!
Member
As far as I know, there is no spring between the key lever fulcrum and the key, nor have I seen one in video tutorials: perhaps you are mistaken. However, there is a spring between the key lever fulcrum and the key lever itself, as in my piano: it serves to remove a few grams by decreasing the weight and therefore the total masses, favoring inertia. In reality, it is a solution that almost all manufacturers no longer adopt. In my opinion, it is useful in the case of short keys, to avoid excessive weighting: in short, to compensate for the inertia due to the short length of the key.
Member
@francescochopin90What piano do you have at your home?
Thank you
Member
A Schimmel with Pleyel branding.
Member
francescochopin90 wrote:On 18/01/2025 at 08:31, francescochopin90 said:
As far as I know, there is no spring between the key lever fulcrum and the key, nor have I seen one in video tutorials: perhaps you are mistaken. However, there is a spring between the key lever fulcrum and the key lever, as in my piano: it serves to remove a few grams by decreasing the weight and therefore the total masses, favoring inertia. In reality, it is a solution that almost all manufacturers no longer adopt. In my opinion, it is useful in the case of short keys, to avoid too much weighting: in short, to compensate for the inertia due to the short length of the key.
So the spring between the fulcrum and the key lever is a sort of balancing. Thank you for the clarification, it will now be useful for me to evaluate different piano models.
