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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP3805975ApriorityCriticalpatent/JPS51113704A/en
Publication of JPS51113704ApublicationCriticalpatent/JPS51113704A/en
PURPOSE: In order to automatically adjust the needle pressure to the established value, by means of installing main-weight in which sub-weight is inserted in shiftable manner, thereby shifting the switch mechanism which detects the needle-pressure and the sub-weight with a inverse motor into inverse direction.