Combination weighing device

A combination weighing device for weighing respective groups of objects to determine a partial combination of the groups of objects having a total weight approximating to a target combination weight, said device comprising:

• a plurality of transport elements controlled in accordance with prescribed parameters to transport respective groups of objects;
• a transport quantity measuring element measuring weights of respective groups of objects transported by said plurality of transport elements;
• means for obtaining an average and standard deviation of weights of respective groups of objects corresponding to a prescribed frequency for each transport element on the basis of weights of respective groups of objects corresponding to said prescribed frequency measured by said transport quantity measuring element;
• and
• means for selecting one of at least two different computation techniques using the obtained average and the obtained standard deviation to determine the prescribed parameter of each transport element in response to the obtained standard deviation.

A combination weighing device comprising:

• a plurality of radiation feeders controlled in accordance with a plurality of prescribed parameters, respectively, to transport a plurality of groups of objects, respectively;
• a plurality of measuring hoppers corresponding, respectively, to the plurality of radiation feeders, each measuring hopper measuring weights of a respective group of objects transported by the corresponding radiation feeder;
• and
• a transport quantity control element controlling the radiation feeders via the prescribed parameters to control said weights, the transport quantity control element comprising:
• an operation element obtaining an average and standard deviation of weights of respective groups of objects corresponding to a prescribed frequency for each radiation feeder on the basis of weights of groups of objects corresponding to said prescribed frequency measured by the measuring hoppers, and
• a parameter operation element determining said prescribed parameters on the basis of said average and said standard deviation of each radiation feeder obtained by said operation element, said parameter operation element selecting one of at least two different computation techniques to determine the prescribed parameter of each radiation feeder in response to said standard deviation obtained by said operation element.