A wheelchair which shifts between forward and reverse by virtue of a rollermechanism which grabs in one direction and slips an opposite direction, thereby preventing binding.
轮椅之间的正向和反向通过一个滚机制美德，在一个方向变化的争夺和单相反的方向，从而防止约束力。
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In order to find out the cause of position deviation of the rollermechanism, the interference source is determined by comparing the feedback signals and making position test at different situations.
Roller gear CAM mechanism is a type of indexing device. It is widely used in various automatic machines because of large indexing Numbers, high indexing precision, reliable localization etc.