Agfa-gevaert Ag

Thomas Hammer

Viktor Osegowitsch

Friedrich Ganser

Wolfgang Viehrig

Erwin Laar

Werner Sieber

Wilfried Hehn

Josef Glass

Franz Kocourek

Wolfgang Kwiatkowski

Hans-Dieter Frick

Hans Dieter Frick

Karl Heinz Ritter

Apparatus for drying sheets of photographic material has a group of parallel lower horizontal shafts and a group of parallel upper horizontal shafts which are staggered with reference to the lower shafts. All of the shafts extend transversely of the direction of travel of sheets therebetween and carry elastic rollers which engage and advance the sheets. Certain shafts carry holders for U-shaped guide members which flank the path of the sheets between the rollers on the upper and lower shafts and prevent the leaders of the sheets from curling into the spaces between the upper or lower shafts. The distance between the axes of two neighboring lower or upper shafts is at least 2D and the distance between the upper and lower guide members is less than D, wherein D is the outer diameter of a roller. The spaces between the rows of rollers on neighboring upper and lower shafts serve (a) to provide room for nozzles which discharge streams of hot gaseous fluid to expel moisture from advancing sheets and (b) to provide room for evacuation of moisture-laden fluid.

Apparatus for drying sheet-like photographic material

An arrangement for treating photographic paper bands which run in parallel paths has at least one treatment station in which the bands are transported with a predetermined speed and treated, winding spools for winding the bands after treating in the treatment station and located downstream of the treatment station, drives for driving the winding spools independently of the transportation of the bands in the treatment station and with a speed exceeding the speed of transportation of the bands in the treatment station, an accumulating station for accumulating the bands between the treatment station and the winding spools so that a loop of the bands is formed in the accumulating station, and a switch for switching the drive on and off in dependence upon a size of the loop of the bands in the accumulating station.

Arrangement for treating photographic bands running in parallel paths

Apparatus for drying webs of photographic paper has a drying unit which has an inlet for admission of wet webs. Such webs advance along discrete paths having V-shaped portions and are dried by hot air which is circulated by blowers. The temperature of air is maintained at a constant value by a control system which adjusts one or more air heaters in the drying unit. The latter has a portion which is adjacent to and is located at a level below the inlet and wherein the moisture content of air is higher than in other parts of the drying unit. Such moisture content is measured and the signals denoting the measured moisture content are used to control the operation of a device which withdraws moisture-laden air from the aforementioned portion of the drying unit. The withdrawn air is replaced with relatively dry atmospheric air entering the drying unit via outlet opening for the webs.

Apparatus for drying webs of photographic paper or the like

Apparatus for simultaneously winding several webs of developed photographic paper on the cores of reels whose flanges rest on pairs of supporting rollers one of which is driven by a discrete variable-speed motor has a loop former for each web. Each loop former adjusts a potentiometer in dependency on changes of tensional stress upon the corresponding web, and the potentiometers cause control circuits for the corresponding motors to reduce the speed of the driven supporting rollers as the diameters of convoluted portions of the webs increase. The webs are fed at a constant speed. The supporting rollers consist of rubber to reduce the noise as a result of contact with the flanges of the respective reels, and to reduce the likelihood of slippage of the reels.

Apparatus for winding webs of photographic paper of the like

A reel for photographic paper has a hollow cylindrical core and two disk-shaped flanges having centrally located extensions received in the respective end portions of the core. The inner side of each flange tapers outwardly in a direction from the periphery of the core toward the periphery of the respective flange. The extensions have ribs which penetrate into the inner surface of the core, and the core is further coupled to each flange by a rubber hose which surrounds the respective extension and is biased against the inner surface of the core by an endless helical spring which surrounds a conical end face of the corresponding extension.

Reel for photographing paper or the like

Apparatus for simultaneous viewing of front and rear surfaces of webs of exposed and developed photographic paper has a frame which supports a rearwardly and upwardly inclined transparent pane constituting the front panel of a box. The frame has a rear wall which is normal to the pane and carries two spindles extending in parallelism with the plane of the pane and serving to support supply and takeup reels for a web of photographic paper whereby the rear side of the web portion between the reels lies against the front side of the pane and the front side of such web portion is observable from the front side of the frame. The box and/or the frame contains a drive which can rotate the one or the other spindle in a direction to cause the respective reel to collect the web while braking the other spindle, and the box contains a pair of mirrors which reflect the image of the rear side of the web portion through the pane so that such image can be seen by a person sitting or standing in front of the frame and viewing the front side of the web portion. At least the spindle for the supply reel is close to the floor so that the supply reel, which normally carries a large roll of convoluted photographic paper, need not be lifted well above the floor in order to be placed onto the respective spindle.

Growing community of inventors

Munich, Germany

Thomas Hammer