Patent ID: 7395183

Claim:
A weight measuring device comprising: a load detecting section for detecting a load value (W) of a sample placed on a measuring pan at predetermined time intervals to obtain a load change; a moving average processing section for performing a moving average processing to calculate a moving average (Wa) of the detected load value (W); a load changing rate calculating section for calculating a load changing rate (Wb) indicating a load change per unit time, based on the obtained load change; a storage section for storing a first load change threshold (Wr 1 ), a second load change threshold (Wr 2 ) which is smaller than the first load change threshold (Wr 1 ) and a load changing rate threshold (Wt); a determining section for determining to execute the moving average processing when the obtained load change is equal to or smaller than the first load change threshold (Wr 1 ) and when the calculated load changing rate (Wb) is smaller than the load changing rate threshold (Wt); and for changing a threshold for canceling the moving average processing from the first load change threshold (Wr 1 ) into the second load change threshold (Wr 2 ) when the obtained load change is equal to or smaller than the first load change threshold (Wr 1 ) and when the calculated load changing rate (Wb) is larger than the load changing rate threshold (Wt); a weight conversion processing section for calculating a weight value of the sample from the load value (W) when the moving average processing is not executed or from the moving average (Wa) when the moving average processing is executed; and, an indicator for displaying the weight value.