Ishida Co. Limited

Shuuji Murata

Yukio Wakasa

Takashi Kimura

Masayoshi Nakajima

Kazuhiro Suhara

Kazuhisa Chimura

A noise canceling apparatus () comprises an amplifier () for amplifying a measured signal (ms) outputted from a measuring device (), an analog filter (), an ADC (), a digital filter (), a coefficient control section (), and a data input section (). The digital filter () is a notch filter for attenuating a frequency component of a quantitative signal D(n) outputted from the ADC () at a plurality of notches (stop bands). A transfer function of the digital filter () is expressed by the product of a plurality of factors each having a root that corresponds to each one of the plurality of notches. The coefficient control section () changes a frequency component of a root corresponding to a notch selected from the plurality of notches, and thereafter, expands in a polynomial the transfer function of the reconstructed digital filter (). On the basis of the polynomial thereby obtained, a new series of filter coefficients is calculated. A filter characteristic is controlled in such a manner that it conforms to a frequency variation of a fixed-period vibration noise, whereby the fixed-period vibration noise that varies in frequency is attenuated with a high degree of precision.

Noise canceling apparatus for weight measurement, and noise canceling method for weight measurement

The combination weighing apparatus is an apparatus that conducts combination weighing of articles based upon weight data from a plurality of weight hoppers, and is comprised of a plurality of supply buckets that supply articles to any of a plurality of weighing hoppers, a rotation mechanism that rotates the supply buckets so that they move along an arrangement of the weighing hoppers in a weighing area, and a control computer. The control computer controls the supply of articles from the supply buckets inside the weighing area to the weighing buckets, and from amongst the plurality of weighing hoppers that request a supply of articles, priority is given to the weighing buckets that are downstream in the direction of rotation, and article supply takes place. In a combination weighing apparatus that supplies articles from supply buckets that rotates with respect to weighing hoppers, preventing difficult situations such as articles being supplied to predetermined weighing hoppers, and improving the accuracy of combination weighing.

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Shiga, Japan

Shuuji Murata