| 摘要 |
PURPOSE:To enable an automatic zero-setting according to variations in the zero point by generating a reference value rewriting signal of a register when deviation between a weight detected and a reference value set for the resister is not within the allowable range continuously. CONSTITUTION:In response to the operation of a start switch 79, a writing permission signal WE is applied into a register 72b of a deviation detecting circuit 71 of a zero-setting means 7 and an output of a weight detecting means 6 prior to the detection of the weight is written into the resister 72b as reference value via a register 72a. Thereafter, each time the detection of the weight is done, a deviation with a subtraction circuit 73 is compared with a set value by a comparator circuit 76 of a decision circuit 75 and a counter 77 is advanced each time it is within the allowable range. When the deviation value is within the allowable range continuously in a specified circuit, it is inputted into a control means 8 via a switching circuit 74 to perform a display for the detection of the weight and others. On the other hand, when the deviation is outside of the allowable range, the comparator 76 generates a resetting output of the counter 77 while the output serves as writing permission signal to write a new reference value into the register 72b whereby the zero-setting is done automatically. |
