Circular path generating device

Abstract

A circular path generating device comprises a base, a sliding stage, a working portion, and a driving device. The sliding stage is movable on the base along a first axial direction while the working portion is movable on the sliding stage along a second axial direction. The driving device has a driving portion and a crank portion, wherein the driving portion is configured for driving the crank portion to rotate, and the crank portion is connected to the working portion. When the driving portion drives the crank portion to rotate, the working portion is driven by the crank portion to move along a circular path. Thus the circular path generating device according to the present invention advantageously owns a mechanism of one degree of freedom and a simple structure, is capable of performing uniform circular motions, and can be easily controlled.

1 . A circular path generating device, comprising:
 a base having a first axial-direction rail portion;   a sliding stage having a first sliding portion and a second axial-direction rail portion, the first sliding portion slidably disposed on the first axial-direction rail portion so as for the sliding stage to move along a first axial direction;   a working portion having a second sliding portion, a working surface, and a non-working surface, the second sliding portion slidably disposed on the second axial-directional rail portion so as for the working portion to move along a second axial direction, wherein a central position of the non-working surface comprises a connecting portion; and   a driving device having a driving portion and a crank portion, the driving portion configured for driving the crank portion to rotate, and the crank portion connected to the connecting portion;   wherein motions of the working portion along the second axial direction and motions of the sliding stage along the first axial direction allow coordinates of the working portion to vary within a predetermined planar range, and when the crank portion is driven by the driving portion to rotate, the working portion is driven by the crank portion to move along a circular path.   
     
     
         2 . The circular path generating device of  claim 1 , wherein the driving device further comprises a speed reducer, two ends of the speed reducer are disposed upon the driving portion and the crank portion, respectively, and the speed reducer drives the crank portion to rotate when being driven by the driving portion. 
     
     
         3 . The circular path generating device of  claim 2 , further comprising two ball bearings, wherein one of said ball bearings is disposed at a connecting position where the connecting portion is connected to the crank portion, and the other of said ball bearings is disposed at a connecting position where the driving portion is connected to the speed reducer.