Barycentric position measuring apparatus

A barycentric position measuring apparatus comprising:

• a load receiving board,
• a first sensor and a third sensor,
• a second sensor and a fourth sensor,
• selection switching means,
• output difference conversion means,
• a memory,
• a barycentric position computation section, and
• output means,
• wherein
• the load receiving board receives a load,
• the first sensor and the third sensor are disposed at opposing two corners out of the four corners of the load receiving board so that the load is passed from the load receiving board and output a positive output,
• the second sensor and the fourth sensor are disposed at the other opposing two corners out of the four corners of the load receiving board so that the load is passed from the load receiving board and output a negative output,
• the selection switching means selects and switches a combination of the positive output from the first sensor and the negative output from the second sensor, a combination of the negative output from the second sensor and the positive output from the third sensor, a combination of the positive output from the third sensor and the negative output from the fourth sensor, and a combination of the negative output from the fourth sensor and the positive output from the first sensor,
• the output difference conversion means determines the output differences of all the combinations selected and switched by the selection switching means,
• the memory stores the output differences determined by the output difference conversion means,
• the barycentric position computation section determines a first directional position based on a comparison of the data stored in the memory, i.e., a comparison of the output difference between the positive output from the first sensor and the negative output from the second sensor with the output difference between the positive output from the third sensor and the negative output from the fourth sensor and also determines a second directional position orthogonal to the first directional position based on a comparison of the data stored in the memory, i.e., a comparison of the output difference between the negative output from the second sensor and the positive output from the third sensor with the output difference between the negative output from the fourth sensor and the positive output from the first sensor, and
• the output means outputs the first directional position and second directional position determined by the barycentric position computation section.