Patent ID: 6899606
Filing Date: 2005-05-31
Classification: B24B

Abstract:
1. A rotary grinding machine comprising: a mounting frame having lower and upper frame portions spaced apart from each other in an upright direction; a rotary grinding member mounted rotatably on said upper frame portion to define a rotating axis in a longitudinal direction transverse to the upright direction; a feeding member disposed under said rotary grinding member and movable relative to said rotary grinding member in the upright direction between operating and non-operating positions, said feeding member including a first roller extending in the longitudinal direction and having a coupling head; a motor mounted on said mounting frame and having an output shaft for delivering a first drive force with an output speed; a drive transmission mechanism disposed to transmit the first drive force of said output shaft to said rotary grinding member so as to rotate said rotary grinding member about the rotating axis with a rotating speed that corresponds to the output speed; a reduction gear mechanism disposed to be coupled with said output shaft so as to deliver a second drive force with a reduced speed that is lower than the output speed; a first transmission shaft rotatably mounted on said mounting frame, and having right and left shaft ends opposite to each other in the longitudinal direction, said right shaft end being coupled to said reduction gear mechanism so as to permit the second drive force to be transmitted to said first transmission shaft, thereby rotating said left shaft end with the reduced speed about a shaft axis that is parallel to the rotating axis; an endless tensible transmission member disposed to be trained on said left shaft end of said first transmission shaft and said coupling head, said endless tensible transmission member including a deflectable segment which runs between said left shaft end and said coupling head, and which is of such a dimension as to place said deflectable segment in a slackened state so as to permit position varying of said coupling head relative to said left shaft end when said feeding member is moved between the operating and non-operating positions; and a tensioning mechanism disposed to place said deflectable segment in a tensed state such that operating tension of said endless tensible transmission member is maintained, thereby enabling effective transmission of the second drive force to rotate said coupling head.