Clock Mechanical analysis of HR series
This kind of Clock Mechanicalstructure has been a common equipment for Clock Mechanical watches and its history has been hundreds of years, especially for antique pocket watches, you can see all kinds of strange "no card" structures. Nowadays, this Clock Mechanical structure is more applied to many well-known brands of Clock Mechanical, which represents the top Clock Mechanical. Here, let us use Clock Mechanical's timing principle to understand the basic concept of "no card degree" and how it improves the timing accuracy of Clock Mechanical, so that many top brand watches in the world favor this Clock Mechanical mechanism.
Clock Mechanical (T: vibration period; π: pi; J b: moment of inertia of the balance wheel; L: length of the balance spring; h: thickness of the balance spring; b: width of the balance spring; E: elastic modulus of the balance spring)
The advantage of Clock Mechanical's "no card" structure is that Clock Mechanical cancels the speed needles that affect Clock Mechanical's timing accuracy in the card structure, and overcomes the isochronous error caused by Clock Mechanical. Instead, it uses the pendulum. The wheel is designed as a structure that can adjust its moment of inertia. One is to set screws or nuts on the outer or inner edge of the balance wheel, and change their position far and near from the center of the balance wheel to change the moment of inertia of the balance wheel; the other is the Clock Mechanical close to the outside of the balance wheel. A rotatable weight is set on the plane of the edge. Generally, the weight is semicircular. By rotating the position of the weight and the non-circular eccentric effect of the weight, the moment of inertia of the Clock Mechanical balance wheel is changed. The final result of these two Clock Mechanical structures is to change the vibration period by changing the moment of inertia of the balance wheel, so as to achieve the purpose of adjusting the clock mechanical speed. The structure of Clock Mechanical without card degree is more difficult to adjust than with card degree structure and can only be produced in small batches. However, the advantage of Clock Mechanical is that the card degree structure cannot be achieved. Therefore, many Clock Mechanical adopt this structure to adjust travel time accuracy. , In order to more easily reach the Swiss observatory timing accuracy standards.
