SUPPORTING MECHANISM FOR TRACING BALL OF A MOUSE

摘要

A SUPPORTING MECHANISM FOR A TRACING BALL OF A MOUSE, THE SUPPORTING MECHANISM FACILITATES A VERY LOW FRICTION BETWEEN THE TRACING BALL AND SUPPORTING MECHANISM USES STEEL BALL WHICH IS WELL LUBRICATED BY THE LUBRICANT FOR A LOW FRICTION ROTATION. THE SUPPORTING MECHANISM COMPRISES A TRACING BALL SOCKET, A MIDDLE HOUSING AND RETAINING RING. WHEN THE TRACING BALL HOUSING IS WELL SET, THE SUPPORTING BODY IS THEN RECEIVED TO THE SUPPORTING RECESS. THEN BY ALIGNMENT BETWEEN THE POSITIONING SURFACE OF THE SUPPORTING SOCKET AND THE POSITIONING SURFACE OF THE FIXING SOCKET OF THE MIDDLE HOUSING, THE POSITIONING POST WILL THE RECEIVED BY THE POSITIONING SLOT SUCH THAT THE CIRCULAR POSITIONING SURFACE WILL MATE WITH THE POSITIONING SURFACE FOR CORRECT ENGAGEMENT. MEANWHILE, THE INNER FIXING STRIP AND THE PUTER FIXING ARE ALSO ENGAGED WITH THE OUTER POSITIONING STRIP AND A INNER POSITION SLOT OF THE MIDDLE HOUSING. ON THE OTHER HAND, THE GROOVE ARE DISPOSED FOR THE INSTALLATION OF THE STEEL BALLS DISPOSED AT THE UPPER END PORTION THE SUPPORTING BODY. ONE STEEL BALLS HAS A HOLE WHICH IS INTERCOMMUNICATED WITH THE SHAFT HOLE AND THE PASSAGE OF THE X-AXIS AND Y-AXIS. A SHAFT IS DISPOSED AT EACH OF THE HOLE. WHEN THE SHAFTS ARE ROTATED BY THE TRACING BALL, THE ENCODING WHEEL IS ROTATED ACCORDINGLY, HENCE A RECEIVING AND ENCODING DEVICE IS PROVIDED TO SEND OUT A SIGNAL WITH RESPECT TO THE ROTATION OF THE ENCODING WHEEL. WHEN THE TRACING BALL IS INSTALLED INTO THE TRACING BALL SOCKET, THE RETAINING RING IS FASTENED TO THE CONNECTING RING OF THE MIDDLE HOUSING TO RETAIN THE TRACING BALL THEREOF. THEN THE RETAINING RING IS ROTATED TO A CERTAIN ANGLE TO LET THE POSITIONING TAB TO BE RECEIVED BY THE RETAINING SLOT BY SLIDING OVER THE SLIDING PORTION. THEN THE RETAINING RING IS RETAINED FROM BEING REMOVED. BY THIS ARRANGEMENT, THE TRACING BALL IS RETAINED IN THE CORRECT POSITION, CONSEQUENTLY, THE CORRECT SIGNAL IS ENSURED.