Belt attachment tool

Abstract

The present invention relates to a belt attachment tool used for further winding a belt, which is wound on a first pulley ( 1 ) and a second pulley ( 2 ), on a third pulley ( 3 ), the belt attachment tool containing a side surface part ( 10 ), an attaching part ( 11 ), a first belt holding part ( 14 ), and a second belt holding part ( 15 ), and the second belt holding part ( 15 ) is arranged so that a point (F) of intersection between a first extension line (L 1 ) extending the belt wound on the first belt holding part ( 14 ) from an outer periphery of the second pulley ( 2 ) and a second extension line (L 2 ) extending the belt wound on the second belt holding part ( 15 ) from an outer periphery of the first pulley ( 1 ) is located to a front side in a rotation direction (A) of the third pulley ( 3 ) with respect to a center line (L 3 ) connecting a center ( 1 S) of the first pulley ( 1 ) with a center ( 3 S) of the third pulley.

The invention claimed is: 
     
       1. A belt attachment tool used for further winding a belt, which is wound on a first pulley and a second pulley and is stretchable in a direction of a circumferential length, on a third pulley by using rotation of the third pulley,
 the belt attachment tool comprising: 
 a side surface part installed on a side of one side surface of the third pulley, 
 an attaching part installed along an outer peripheral part of the third pulley, 
 a first belt holding part formed along an outer periphery of the side surface part, and 
 a second belt holding part formed on the side surface part, 
 wherein the second belt holding part is formed on the side surface part so as to satisfy, when the belt is wound on the first pulley, the second pulley, the first belt holding part, and the second belt holding part, a first arrangement condition where the second belt holding part is arranged so that a point of intersection between a first extension line extending the belt wound on the first belt holding part from an outer periphery of the second pulley and a second extension line extending the belt wound on the second belt holding part from an outer periphery of the first pulley is located to a front side in a rotation direction of the third pulley with respect to a center line connecting a center of the first pulley with a center of the third pulley. 
 
     
     
       2. The belt attachment tool according to  claim 1 ,
 wherein the second belt holding part is formed on the side surface part so as to further satisfy, when the belt is wound on the first pulley, the second pulley, the first belt holding part, and the second belt holding part, a second arrangement condition where the second belt holding part is arranged to a front side in the rotation direction of the third pulley with respect to a center line connecting a center of the second pulley with the center of the third pulley. 
 
     
     
       3. The belt attachment tool according to  claim 1 ,
 wherein the side surface part comprises
 an installation part brought into contact with at least a part of the one side surface of the third pulley, and 
 a protection part which does not come into contact with the one side surface of the third pulley and covers at least a part of the one side surface, and 
 
 wherein the protection part covers at least a part of a portion with the longest distance in a vertical direction from a plane defined by a portion with which the installation part comes into contact in the one side surface, in a region inward the portion with which the installation part comes into contact in the one side surface of the third pulley. 
 
     
     
       4. The belt attachment tool according to  claim 3 ,
 wherein the installation part is coupled to the protection part in a stepped manner. 
 
     
     
       5. The belt attachment tool according to  claim 1 ,
 wherein a part of the first belt holding part is projected outwardly from the outer periphery of the side surface part. 
 
     
     
       6. The belt attachment tool according to  claim 1 ,
 wherein a portion of the first belt holding part, on which the belt is wound has a substantially circular arc shape. 
 
     
     
       7. The belt attachment tool according to  claim 1 ,
 wherein a portion of the first belt holding part, on which the belt is wound has a substantially involute curve shape, and the first belt holding part and the second belt holding part are arranged in a straight line. 
 
     
     
       8. The belt attachment tool according to  claim 1 ,
 wherein the first belt holding part is formed integrally with the second belt holding part. 
 
     
     
       9. The belt attachment tool according to  claim 8 ,
 wherein in the first belt holding part and the second belt holding part that are integrally formed, a portion on which the belt is wound has a substantially circular arc shape.