Patent ID: 6772969
Filing Date: 2004-08-10
Classification: B02C

Abstract:
A break roll machine having: a fixed roll bearing housing fixed to a machine frame; a movable roll bearing housing which is movable nearer or further with respect to said fixed roll bearing housing; a pair of break rolls rotatably held by said fixed roll bearing housing and said movable roll bearing housing, respectively; a roll gap adjusting mechanism provided between said fixed roll bearing housing and said movable roll bearing housing, for adjusting a gap defined between said pair of break rolls; and a differential transmission mechanism for causing said pair of break rolls to rotate respectively inwardly at different circumferential speeds with each other, said differential transmission mechanism comprising:timing-belt pulleys mounted to rotary shafts of said pair of break rolls, respectively; a timing belt wound on said timing-belt pulleys; an idler pulley for applying a predetermined tension to said timing belt; a pair of tension arms which sandwich said idler pulley therebetween and rotatably hold a rotary shaft of said idler pulley at first end portions, and which are mounted rotatably at second end portions, one of said paired tension arms located at an opposite side of said break rolls having at said first end portion a cutout portion which can release said rotary shaft of said idler pulley; an operation lever for causing said first end portions of said paired tension arms together with said idler pulley to rotate around a pivot point at said second end portions of said tension arms; and a tension adjusting mechanism which moves said operation lever for adjusting a position of said idler pulley.