Agfa-gevaert Ag

Gunter Lammel

Erich Nagel

Helmut Treiber

Leonhard Huber

Christian Gotze

Apparatus for convoluting a web of photographic paper issuing from a copying machine onto a core of a cassette which is movable to a predetermined position with reference to the machine has an operating device which can deactivate the web catcher mechanism in the cassette in response to detection of adequate attachment of the leader of the web to the core. The catcher mechanism serves to guide the leader of the web into engagement with the core and is activated on movement of the cassette to its predetermined position. The circuit which monitors the engagement between the leader of the web and the core compares the peripheral speed of the core with that of a rotor which is installed in the machine and whose peripheral speed is lower than that of the core prior to completion of attachment of the web to the core. The operating device utilizes an electromagnet or an electric circuit whose condition is changed by the monitoring circuit when the attachment of the leader of the core is completed, and such change in condition initiates the deactivation of the catcher mechanism. The rotor advances the web toward the core during attachment of the leader to the core but is rotated by the web when the attachment is completed.

Apparatus for introducing strip-shaped material into cassettes or the

A copying machine admits a web of freshly exposed photographic paper directly into a cassette whose core engages and convolutes the web therearound. The progress of engagement between the leader of the web and the core is monitored by comparing the peripheral speed of the core with the peripheral speed of a rotor forming part of an advancing roll for the web and receiving torque from a variable-speed motor which also drives the core. The peripheral speed of the rotor increases when the leader of the web is adequately attached to the core, and this is detected by a circuit having first and second photoelectronic monitoring devices which respectively monitor the peripheral speeds of the rotor and the core. The signals which are generated by the monitoring devices are processed, and the processed signals are used to change the speed of the variable-speed motor, to deactivate a catcher mechanism which directs the leader of the web toward the core and assists in the establishment of adequate engagement between the leader and the core, to change the supply of energy to the motor as the diameter of convoluted web on the core increases, and/or to actuate an alarm device when the completion of attachment of the leader to the core is unduly delayed.

Growing community of inventors

Eching, Germany

Gunter Lammel