Paper take-up device for a photographic printing (copying) device

摘要

A paper take-up device serves for taking up photographic paper after exposure onto a take-up spool in a photographic printing device. A loop-producing section for storing an exposed section of the photographic paper in the form of a loop is arranged upstream of the take-up spool. The take-up spool is rotated by a DC motor which is activated or deactivated as a function of the extent of the loop. A paper-guiding arm is provided for the purpose of limiting the outermost winding of the roll of paper wound onto the take-up spool. An angle detector measures the inclination of the paper-guiding arm for the purpose of determining the diameter of the roll of paper. The DC motor is braked dynamically after being switched off, and a resistance value or a braking time for a dynamic braking of the DC motor is changed in accordance with the diameter of the roll of paper in order to reduce a variation in the amount of paper take-up as a function of the diameter of the roll of paper in the deceleration time which extends from the switching off up to the actual coming to rest of the DC motor. <IMAGE>