Web-meandering preventing device

摘要

A device for preventing meandering or free running of a web on a roll supported on a shaft on a machine, like a thermal printer. A stationary shaft is fixed to the frame. A core is rotatably mounted around the shaft. A reel mounted around the core has a carbon ribbon that is to be wound on it or unwound from it when the reel is rotated. A leaf spring between the core and the inner circumference of the reel frictionally connects the reel and the core so that the reel does not rotate idly of the core, but rotates together with the core. The core is held by a spacer at a predetermined distance along the shaft from the machine frame. A spring acting on the opposite side of the core pushes the core toward the spacer, whereby the core is frictionally restrained from freely rotating, which prevents web meander. Felt washers disposed between the core and the elements axially adjacent thereto smooth the rotation of the core and prevent wear thereof.