Web transport for photographic copier - has driven take-up reel with free wheel mechanism preventing reverse rotation

摘要

The web transport for a photographic copier is used to intermittently feed the web between a supply reel and a driven take-up reel (3). Braking intermittently operates on the web before the take-up reel (3), while the drive for the latter prevents its reverse rotation. The braking pref. comprises two rollers (8, 9). One roller is coupled via a cog wheel drive with a hysteresis brake using two counter-rotating permanent magnetic discs. The take-up reel (3) is pref. driven from a motor via a transmission gearing, with a free wheel mechanism allowing the reel (3) to be manually rotated in the take-up direction, but preventing reverse rotation.