The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 2004
Filed:
Aug. 22, 2002
Hirata Corporation, , JP;
Abstract
A work conveying system eliminates gravitational deflection of an extended articulated arm of a vertical mover. The conveying system includes a horizontal mover which carries the vertical mover and a work holder for delivering a workpiece to various apparatuses without dislocation. In conveying a workpiece horizontally, the vertical mover folds compactly to minimize air disturbance. Plural arm elements of the articulated arm overlap and are connected together in an alternate manner at their respective end portions, and the articulated arm is extended and contracted by pivotal movement of the arm elements, driven by a single drive unit. The horizontal mover is movable in an arbitrary horizontal plane within the upper ceiling space within the clean room. Shafts in the articulated arm and a rotary drive unit in the work holder have hollow interiors which are intercommunicated and at a negative pressure.