14th November 2007 – Hitachi’s has launched a drum-type washer/dryer that employs a drum featuring the industry’s largest diameter^*1 to provide high quality finish in washing and drying, while achieving the industry’s lowest noise level and offering exceptional water-saving performance^*2

It features a big drum with the industry’s largest 60cm diameter and a 75L capacity. The big drum washing beats and washes clothing firmly with a large drop, and a big drum drying effectively separates clothing to minimize wrinkling and ensures soft drying, resulting in a high degree of cleaning and drying performance.

Hitachi has developed three epoch-making technologies to reduce vibration for which computer simulation is used to conduct analysis, thereby enabling vibration-proof support, inhibiting imbalance, and providing optimal operation control. Vibration-proof support requires a hard suspension in response to large motions upon rotor activation and a flexible suspension in response to minor motions when the rotor enters a steady state of stable rotation.

Hitachi successfully developed a twin action suspension that optimally inhibits both major and minor vibrations by using a single suspension based on advanced technology cultivated in the handling of automotive suspensions. Hitachi Big Drum washer also adopts a five-ply fluid balancer that incorporates five layers of balancers provided width-wise in the drum to inhibit imbalance. This significantly increases balance precision and reduces vibration amplitude. For optimal operation control, it employs a double vibration sensor to increase the precision of vibration detection control. It enables detection of magnitudes and directions of vibrations accurately by using two vibration sensors.

Hitachi Big Drum washer incorporates three technologies for reducing vibration, each of which represents an industry first^*1, and reduces vibration stemming from the use of a larger drum and achieves the industry’s lowest noise level^*2. Only 60cm deep, the machine offers the thinnest body in the industry^*2 and can easily be fitted neatly together with a washbasin unit. Hitachi Big Drum washer adopts new technologies for increasing drying efficiency, and thus enables the washing of 9kg of clothing and the washing and drying of 7kg of closing and reducing the time of washing and drying the half^*3.

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