Sliding door opening and closing controlling mechanism, has transmission belt with ends connected with main open spring and secondary spring, where stiffness of main spring is greater than that of secondary spring

摘要

The mechanism has a motor (11) driving casements (V1, V2) by drivers connected to a transmission belt (7). The belt having a non notched smooth section is conformed according to an open loop. The belt has an end connected with a main open spring (8), and an opposite end connected with a secondary spring (9) that is tensioned by the belt, where the stiffness of the spring (8) is greater than that of the spring (9).