| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for fixing grinding teeth for shredding paper applied to a document shredder to a driving shaft, by which fixation is performed with a structure that prevents backlash from occurring, for example, due to a secular change and low acoustic noise is realized by preventing vibration noise upon shredding from being transmitted from the shredding teeth to the driving shaft. SOLUTION: Taper shape helical grooves are provided at the joint of the grinding teeth and the driving shaft. Within the taper shape helical grooves, pins are arranged so as to cause the taper parts to bite the pins, by which the grinding teeth and the driving shaft are fixed because of point contact via the pins. Thus, a stable retention of fixation, vibration isolation, and sound insulation effects are realized. COPYRIGHT: (C)2008,JPO&INPIT
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