| 摘要 |
PROBLEM TO BE SOLVED: To obtain a ball transfer that can be used in a clean room by restraining the occurrence of dust, in a ball transfer that emission of the dust is inevitable because each sub sphere 20 being built-in for enabling free circulation contacts in friction respectively. SOLUTION: In a ball transfer 10 consisting of main sphere 30 that directly supports a conveyance object, built-in sub spheres 20 to support its main sphere 30 and circulate freely and a case 11 including sphere receptacle section 11a of hemispherical recess shape so as to position always its sub spheres 20 in the place to support the main sphere 30, it makes many of non-circle holes 11b, 11c that sub spheres 20 are difficult to stick penetrate even to external of the case 11 in order to aspire the dust occurring inside of the case 11 and the dust, etc., being entered from outside. COPYRIGHT: (C)2003,JPO |
