| 摘要 |
<p>An area-measuring device comprises a length-meter, a breakage sensor, and a strip cutter, all having outputs connected to inputs of an inhibit circuit, a frequency divider, and an output counter. The cutter has one input being connected to the length meter output, and another connected to the breakage sensor output. A two-position switch has one position connected to the inhibit unit output, and a second position connected to an AND gate output, having one input connected to the output of an overflow blocking unit. The other AND gate input connected to a reference frequency generator output and a count input of the controlled frequency divider having control inputs connected to intermediate memory counter outputs and to overflow blocking units. The intermediate memory count input is connected to an input of a two-position switch; its clearing input is connected to a common clearing line. A reference frequency generator output is connected to count inputs of two control frequency dividers. Connected through NAND gates to the control inputs of one controlled frequency divider is a correction input unit. The NAND gates have common inputs connected to the second position of the second switch having a grounded switch arm. Outputs of the two frequency dividers are connected to a coincidence circuit through a time interval generator with control inputs connected to a width-setting unit. The coincidence circuit output is connected to the output counter wherein the clearing input is connected to the time interval generator clearing output. The strip material area measuring device features a higher measurement accuracy than the prior art apparatus and allows measuring area of practically all the different-size rolls, and controlling the measurement accuracy of the device during operation.</p> |
