Information acquisition system and positioning device

An information acquisition system comprising:

• a transmission device configured to transport a carrier carrying a plurality of products;
• an information acquisition device configured to obtain identification information of a corresponding one of the plurality of products when the carrier stops moving;
• a control device;
• and
• a positioning device comprising a positioning member, a plurality of elastic members, a plurality of blocking members spaced apart and mounted on the positioning member, and a driving member fixedly coupled to the positioning member and configured to drive the positioning member to move telescopically between an extended position and a retracted position;
• wherein:
• each of the plurality of elastic members is coupled between a corresponding one of the blocking members and the positioning member;
• when the positioning member is moved from the retracted position to the extended position, one of the plurality of blocking members blocks the carrier from moving;
• when the positioning member is moved from the extended position to the retracted position, the blocking member that was blocking the carrier unblocks the carrier to allow the carrier to move;
• when the positioning member is moved from the retracted position to the extended position, the blocking member that was blocking the carrier is resisted by the carrier and causes the corresponding elastic member to compress, and a restoring force of the elastic member restores a position of the blocking member after the carrier moves past the blocking member;
• and
• each time when the information acquisition device obtains the identification information of one of the plurality of products, the control device controls the driving member to move the positioning member to the retracted position and then move to the extended position;
• wherein the positioning member comprises a fixing plate and a positioning plate;
• the fixing plate is fixedly coupled to the driving member;
• the positioning plate defines a positioning slot extending in a direction perpendicular to a movement direction of the positioning plate;
• a number of fixing shafts are spaced apart and movably received in the positioning slot;
• each blocking member is rotationally fixed on a fixing shaft in a one-to-one manner;
• the blocking members are located on two sides of the positioning plate;
• and
• the elastic members are coupled between the fixing plate and the blocking members.