| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for easily and efficiently suppressing the effect of loss of synchronism occurring in a stepping motor even in a situation where various conditions associated with the operation are changeable, in a weighing device in which a hopper gate is driven by the stepping motor.SOLUTION: One opening and closing action of the hopper gate is divided into a plurality of opening and closing steps, and a command pulse is separately set in each of the opening and closing steps and a motor drive pattern is organized as an assembly of the command pulses and stored in a memory part 23. A calculation part 21 drives the stepping motor by controlling a motor drive circuit 13 based on the motor drive pattern. However, when the occurrence of the loss of synchronism is determined by a synchronism loss determination device 22 from the positional change of the stepping motor 11 detected by a position sensor 12A, the motor drive pattern is reset. |
