Dust-cleaning apparatus for tracking ball

Abstract

A dust-cleaning apparatus for a tracking ball includes a cover, a seat body, a tracking ball, and a dust-cleaning textile. The tracking ball rolls inside the seat body that is combined with the cover. Furthermore, a partially spherical surface of the tracking ball is exposed out of the seat body. The dust-cleaning textile is disposed between the seat body and the cover and has a hole for the tracking ball to pass through and compactly contact the dust-cleaning textile. Due to the compact contacting with the tracking ball, the dust-cleaning textile prevents foreign matter from attaching on to the spherical surface of tracking ball or from entering the seat body. Moreover, foreign matter is isolated outside the seat body so that the tracking ball can be used normally.

1 . A dust-cleaning apparatus for a tracking ball, comprising:
 a cover, having a through-hole;   a seat body, combining with the cover and having a receiving space;   a tracking ball, rotatably mounted in the receiving space of the seat body, and a partially spherical surface of the tracking ball protruding out of the through-hole of the cover; and   a dust-cleaning textile, located between the cover and the seat body and having a hole for the tracking ball to pass through and contact the dust-cleaning textile;   wherein the tracking ball has a predetermined relative chord length greater than or equal to a diameter of the hole in a position where the tracking ball contacts the dust-cleaning textile so that the dust-cleaning textile contacts the spherical surface of the tracking ball.   
   
   
       2 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 1 , wherein the dust-cleaning textile is fixed between the cover and the seat body via adhesion. 
   
   
       3 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 1 , wherein the dust-cleaning textile has locating holes, and fixing tenons are disposed between the cover and the seat body, and the fixing tenons pass through the locating holes to attach the dust-cleaning textile between the cover and the seat body. 
   
   
       4 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 1 , wherein the dust-cleaning textile is made by stacking at least one layer of non-woven fabrics. 
   
   
       5 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 1 , wherein the dust-cleaning textile is made by stacking at least one layer of paper. 
   
   
       6 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 1 , wherein the dust-cleaning textile is made by stacking a plurality of layers of non-woven fabrics and paper. 
   
   
       7 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 1 , further comprising:
 a circuit board;   a light source generator, electrically mounted on the circuit board;   a light source detector, electrically mounted on the circuit board;   an optical base, mounted on the circuit board, corresponding to a direction along which the light source generator emits light, the light source detector being mounted on a bottom of the optical base, and the seat body sheathing the optical base; and   a holding base, mounting a plurality of ball bearings inside thereof, wherein partial surfaces of each ball bearing are exposed out of the holding base, the holding base is disposed in the receiving space of the seat body, and each ball bearing contacts the spherical surface of the tracking ball for locating the tracking ball above the light source generator.   
   
   
       8 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 7 , wherein the seat body is a sleeve. 
   
   
       9 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 7 , wherein the seat body has an opening for a part of the light source generator to pass through, and the holding base has a perforating hole for light emitted from the light source generator to pass through. 
   
   
       10 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 1 , further comprising:
 a circuit board;   two grating wheels, turnably assembled inside the seat body relative to the tracking ball, wherein the tracking ball jointly drives the two grating wheel to rotate; and   two encoding assemblies, electrically mounted on the circuit board;   wherein the seat body is mounted on the circuit board and the two grating wheels correspond to the two encoding assemblies, respectively.   
   
   
       11 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 10 , wherein the seat body integratedly forms the receiving room concavely downwards from an upper surface thereof. 
   
   
       12 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 10 , wherein each of the two encoding assemblies includes a light detector and an encoding circuit. 
   
   
       13 . The dust-cleaning apparatus for a tracking ball as claimed in  claim 10 , wherein each of the two encoding assemblies includes a light transmitter and a light receiver.