Automatic device and safety apparatus thereof

A piece of automatic device, comprising:

• a controller;
• a movable member, communicatively connected to the controller;
• a plurality of safety apparatuses, each of the plurality of safety apparatuses comprising:
• a contact detector, for detecting a contact event of the safety apparatus, and outputting a contact signal;
• and
• a module, comprising:
• a first input terminal, communicatively connected to the contact detector, for receiving the contact signal;
• an output terminal, communicatively connected to the first input terminal, for outputting an output signal when the first input terminal receives the contact signal;
• a second input terminal, communicatively connected to the output terminal, being capable of communicatively connecting to an output terminal of another safety apparatus among the plurality of safety apparatuses;
• two parallel-connected determination circuits, communicatively connected to the first input terminal, for determining whether the contact signal is greater than a threshold, and outputting a determination signal when the contact signal is greater than the threshold;
• and
• two parallel-connected output switches, connected in series between the two parallel-connected determination circuits and the output terminal, using and outputting the determination signal as the output signal from the output terminal,
• wherein the plurality of safety apparatuses are sequentially cascaded to one another, wherein an output terminal of one of the safety apparatuses is communicatively connected to the controller, an output terminal of one of the remaining safety apparatuses is communicatively connected to the second input terminal of the next safety apparatus, and upon receiving the output signal from the output terminal of the one safety apparatus among the plurality of safety apparatuses, the controller changes a motion state of the movable member of the automatic device.