| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an inexpensive dental suction system of which the mainframe is not required to be replaced even when the service life of the suction mainframe ends. <P>SOLUTION: This suction system for dentistries comprises three steps. In the first step, when the integral driving hours of the suction mainframe 3 are judged to have reached a first set time which is stored in a storage section 60 by a time counting section 62 by a control section 58, the driving is switched from the suction mainframe 3 to the other suction mainframe 4. In the second step, the integral driving hours of the other suction mainframe 4 are judged to have reached a second set time which is stored in the storage section 60 by the time counting section 62 by the control section 58, the driving is switched from the other suction mainframe 4 to the first suction mainframe 3. In the third step, when the suction mainframe 3 stops at the end of the service life, the driving of the other suction mainframe 4 is stopped by the operation of an emergency switch 34 if the period of time started from the operation point of the emergency switch 34 for starting the driving of the other suction mainframe 4 has reached a third set time. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
