Patent ID: 8146734
Filing Date: 2012-04-03
Classification: B65G,G03G

Abstract:
1. A belt unit comprising: a first roller; a second roller; a belt extended with at least the first roller and the second roller; a first supporting member for supporting the first roller; a second supporting member disposed to be freely rotatable relative to the first supporting member for supporting the second roller; a switching member for switching the first supporting member and the second supporting member between a first state for applying tension to the belt and a second state for loosening the belt; and a regulating member for regulating the second supporting member to rotate. said switching member includes a first engagement member attached to one of the first supporting member and the second supporting member to be freely rotatable and a first engaged member attached to the other of the first supporting member and the second supporting member for engaging the first engagement member so that the first supporting member and the second supporting member are maintained in the second state when the switching member rotates.