Controllable transmission system and method thereof

A controllable transmission system, comprising:

• a transmission shaft and a plurality of blade units coupled to the transmission shaft, wherein each the blade unit has an adjustable blade having a first and a second contact elements;
• a coupling unit having a contact surface;
• and
• a control device coupled to the coupling unit for controlling the coupling unit for engaging in one of actions of positioning the contact surface corresponding to the first contact element and positioning the contact surface corresponding to the second contact element.

A controllable transmission method, comprising the steps of:

• providing a transmission shaft coupled to a plurality of blade units, wherein each the blade unit has an adjustable blade having a first contact element and a second contact element;
• providing a coupling unit having a first and a second contact surfaces;
• moving the coupling unit to cause one of the first and the second contact elements to be pushed by one of the first and the second contact surfaces to adjust the adjustable blade;
• and
• modulating a transmission efficiency of a force applied on each the plurality of blade units.

A controllable transmission method, comprising the step of providing a controllable transmission system comprising:

• a first rotation device, comprising:
• the transmission shaft;
• a rotation body;
• and
• the plurality of blade units connected with the rotation body, wherein each of the blade units has an opening corresponding thereto;
• a coupling device mounted beside the rotation device and comprising the coupling unit having a first and a second contact surfaces;
• and
• a control device connected with the coupling device for controlling a movement of the coupling device to cause one of situations that the first contact surface is positioned corresponding to the first contact element and that the second contact surface is positioned corresponding to the second contact element, wherein each the blade unit receives a minimum stress when the adjustable blade is not covering the opening, and receives a maximum stress when the opening is covered by the adjustable blade.