Banknote position detection device

An apparatus for detecting a banknote location, which is installed in a banknote passage, the apparatus comprising:

• a first photoelectric sensor installed at an entrance of the banknote passage, wherein the first photoelectric sensor comprises a light-emitting end, a light-receiving end, a first reflecting mirror and a second reflecting mirror;
• the light-emitting end and the light-receiving end are arranged symmetrically on two side ends of the entrance on a lower passage plate of the banknote passage, and a distance between the light-emitting end and the light-receiving end is not more than a length of a banknote to be detected;
• the first reflecting mirror and the second reflecting mirror are arranged symmetrically on two side ends of the entrance on an upper passage plate of the banknote passage, the first reflecting mirror is located right above the light-emitting end while the second reflecting mirror is located right above the light-receiving end, and both of the first reflecting mirror and the second reflecting mirror are arranged in a face-to-face manner at an inclined angle of 45 degrees, to control a light beam emitted by the light-emitting end to be vertically directed to the first reflecting mirror, then reflected to the second reflecting mirror, and then vertically directed to the light-receiving end via reflection by the second reflecting mirror;
• a second photoelectric sensor installed at an exit of the banknote passage, wherein the second photoelectric sensor comprises a light-emitting end, a light-receiving end, a third reflecting mirror and a fourth reflecting mirror;
• the light-emitting end and the light-receiving end are arranged symmetrically on two side ends of the exit on the lower passage plate of the banknote passage, and a distance between the light-emitting end and the light-receiving end is not more than the length of the banknote to be detected;
• the third reflecting mirror and the fourth reflecting mirror are arranged symmetrically on two side ends of the exit on the upper passage plate of the banknote passage, the third reflecting mirror is located right above the light-emitting end while the fourth reflecting mirror is located right above the light-receiving end, and both of the third reflecting mirror and the fourth reflecting mirror are arranged in a face-to-face manner at an inclined angle of 45 degrees, to control a light beam emitted by the light-emitting end to be directed to the third reflecting mirror, then reflected to the fourth reflecting mirror, and then vertically directed to the light-receiving end via reflection by the fourth reflecting mirror;
• and
• a third photoelectric sensor installed in the banknote passage, wherein the third photoelectric sensor comprises a light-emitting end, a light-receiving end, an upper reflecting mirror group and a lower reflecting mirror group;
• the light-emitting end and the light-receiving end are arranged symmetrically at an entry end and an exit end of the lower passage plate of the banknote passage, and the light-emitting end is located between the light-emitting end of the first photoelectric sensor and the light-receiving end of the first photoelectric sensor while the light-receiving end is located between the lighting-emitting end of the second photoelectric sensor and the light-receiving end of the second photoelectric sensor;
• the upper reflecting mirror group comprises a plurality of reflecting mirrors while the lower reflecting mirror group comprises reflecting mirrors having a number two less than the number of the reflecting mirrors of the upper reflecting mirror group, and the plurality of reflecting mirrors of the upper reflecting mirror group are arranged at a uniform interval on the upper passage plate and two of the reflecting mirrors of the upper reflecting mirror group are arranged respectively right above the light-emitting end and the light-receiving end of the third photoelectric sensor, and the reflecting mirrors of the lower reflecting mirror group are arranged on the lower passage plate in one-to one correspondence with the other reflecting mirrors of the upper reflecting mirror group, with each pair of opposite upper reflecting mirror and lower reflecting mirror being arranged in a face-to-face and parallel manner;
• every two of the plurality of reflecting mirrors of the same reflecting mirror group are arranged in a face-to-face manner at an inclined angle of 45 degrees, to control a light emitted by the light-emitting end is vertically directed to the light-receiving end via reflection by the upper reflecting mirror group and the lower reflecting mirror group.