| 摘要 |
PROBLEM TO BE SOLVED: To provide a material feeder 11 wherein an influence of a time required for correction processing can be reduced by obtaining errors with a high precision by correction per operation unit. SOLUTION: Materials in a material vessel are discharged by a discharging means 13 for the material vessel. The mass of the material vessel is measured by a measurement part 27. On the basis of a reference value of a discharging operation time per unit discharge quantity, the discharging means 13 for the material vessel is operated by a prescribed time to discharge materials by a prescribed discharge quantity, by a material discharge control means 32. A reference value Y (=B/A wherein A is a mass variation of the material vessel 12 measured by the measurement part 27 and B is a cumulative discharging operation time of the discharging means 13) of the discharging operation time per unit discharge quantity is obtained per operation unit of 100 discharging operations. The reference value Y is taken as a new reference value of the material discharge control means 32 in the next operation unit to perform correction. Errors are obtained with a high precision by correction per operation unit to reduce an influence of a time required for correction processing. COPYRIGHT: (C)2006,JPO&NCIPI
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