Positional stop device

A positional stop device comprising:

• a base body defining a receiving space;
• and
• a transmission assembly comprising
• a lever;
• a driving element moveablely received in the receiving space, and partially exposed out of the base body;
• and
• a retaining member moveablely received in the receiving space;
• wherein
• the lever is rotatablely arranged on the base body, a first end of the lever is coupled to the driving element, and a second end of the lever is coupled to the retaining member;
• when a slider of a pneumatic rodless cylinder slides along a first direction, the driving element is driven by the slider to move along a second direction and further to be fully received in the receiving space from partially being exposed out of the base body;
• the lever is driven by the driving element to rotate around the base body when the driving element moves along the second direction;
• and
• the retaining member is driven by the lever to move along a third direction and to be partially exposed out of the receiving space, the exposed retaining member stops the slider from sliding along the first direction and to stay on a cylinder body of the pneumatic rodless cylinder.