Combination weighing device with selectable weighing hoppers

A combination weighing device comprising:

• a conveyance unit configured to convey an article;
• a plurality of first hoppers each configured to receive the article conveyed by the conveyance unit, temporarily hold the received article, and then discharge the article downstream;
• a plurality of second hoppers detachably provided on a downstream side of the plurality of first hoppers, and each of the plurality of second hoppers configured to receive the article discharged from corresponding one of the plurality of first hoppers, temporarily hold the received article, and then discharge the article downstream;
• a weighing unit configured to weigh the article held in each of the plurality of second hoppers, and obtain a weighing value corresponding to mass of the article;
• and
• a control unit configured to perform combination calculation to select such a combination of weighing values a total value of which becomes a target weighing value, and discharge the article from second hoppers of the plurality of second hoppers corresponding to the combination,
• wherein
• the control unit performs the combination calculation based on the weighing value corresponding to the mass of the article held in each of the plurality of second hoppers, and
• when at least one of the plurality of second hoppers is removed, the control unit continues the combination calculation based on the weighing value corresponding to the mass of the article held in each of the plurality of second hoppers other than the part of the at least one removed second hopper, stops a discharging operation of the first hopper on an upstream side of the at least one removed second hopper, and stops a conveying operation of the conveying unit on the upstream side of the at least one removed second hopper.