Thread take-up lever stroke 挑线杆行程

Thread take-up cam 挑线凸轮

Thread take-up crank 挑线曲柄

Thread take-up lever roller 挑线杆滚柱

Thread take-up lever hinge pin 挑线杆铰合销

Thread take-up crank position screw 挑线曲柄固定螺丝

Thread take-up lever complete 凸轮式挑线杆组 ; 连杆式挑线杆组

thread take up mechanism 挑线机构

Thread take-up lever link 挑线杆支架

Thread take-up hinge screw 挑线杆铰链螺丝