Patent ID: 6244182
Filing Date: 2001-06-12
Classification: B41F

Abstract:
An anti-expansion web-transfer mechanism mounted between two printing units in a color press to transfer a web from one printing unit to a next printing unit, and to prevent the printed web from expanding in width, the anti-expansion web-transfer mechanism comprising:a first bracket and a second bracket fixedly arranged in parallel;a first axle coupled between said first bracket and said second bracket and rotated on the axle thereof;a second axle fixedly connected between said first bracket and said second bracket and arranged in parallel to said first axle, said second axle defining with said first axle a web-transfer gap through which the printed web is delivered;a plurality of roller supports respectively mounted on said first axle and said second axle, said roller supports each comprising a clamping hole, which receives one of said first axle and said second axle, a tightening up screw fastened up to fix the respective roller support to said first axle or said second axle and to stop the respective roller support from rotary motion relative to the respective axle;a plurality of rollers respectively mounted on said roller supports;a transmission mechanism controlled to rotate said first axle, enabling the rollers at the roller supports at said first axle to be pressed on the printed web in a direction opposite to the rollers at the roller supports at said second axle, said transmission mechanism comprising a mounting block pivoted to said first bracket, a nut mounted in said mounting block, a driven gear fixedly mounted on said nut and disposed outside said mounting block, a screw rod threaded into said nut, said screw rod having a coupling portion extended from one end thereof and coupled to one roller support at said first axle, a stop block fixedly mounted on the coupling portion of said screw rod and stopped at one side of said of said first bracket, a motor mount fastened to said mounting block at a bottom side, a reversible motor mounted on said motor mount, and a driving gear meshed with said driven gear and driven by said reversible motor to rotated said driven gear; andan air cylinder connected to the coupling portion of said screw rod, said air cylinder having a piston rod pivoted to one roller support at said first axle.