Hoechst Aktiengesellschaft

Dieter Topfer

Rudi Schwandt

Dieter Krause

Hans Heist

Wolfgang Salzburg

Wolfgang Diels

Disclosed is a metering device for the application of lacquer to printing plates 16, comprising a first doctor blade 1 which serves as a damming-up blade and a second doctor blade 2 acting as a metering blade. The two flexible blades are arranged parallel to one another and are inclined toward the surface of the printing plate. They define a lacquer bath 3 into which lacquer is metered via a spray tube 7 having outlet openings 19. The first doctor blade 1 can be adjusted in height, and adjustment is effected in such a way that the lower edge of the blade 1 is in sealing contact with the printing plate 16. The second doctor blade 2 is fastened to an adjusting means 6 and its height can be chosen independently of the position of the first doctor blade.

Metering device for lacquer

This invention relates to an improvement in a doctor blade device adapted for use in an automatic processor for printing plates, comprising at least one doctor blade made of a flexible material and being detachably mounted in a guide bar, and holding means for attaching the doctor blade to two side plates of the printing plate processor, the improvement comprising means connecting the guide bar with a carrier bar each end of which is adapted to be inserted from above into a channel section having an upwardly pointing opening and having two arms spaced by a web; means securing each channel section by its web to a side plate in such a manner that its two arms extend transversely to the transport direction of a printing plate in the direction of the interior of the printing plate processor; and support means at both ends of the upper surface of the carrier bar whereby the carrier bar together with the connected guide bar and the doctor blade rest upon said channel sections.

Doctor blade device in automatic processors for printing plates

This invention relates to an improvement in apparatus for developing printing plates, comprising at least one tank in which a processing liquid is contained and at least one filter means through which the processing liquid is passed on its flow path from or to the tank, the improvement comprising means mounting the filter means within the tank without a filter housing of its own, and means mounting the tank on carriage means which can be withdrawn from the apparatus.

Apparatus for developing printing plates comprising a tank in which

This invention relates to an improvement in an apparatus for developing printing plates comprising pairs of upper and lower rolls adapted to convey said printing plates, bearing means at each end of each upper roll, and toggle lever means adapted to raise and lower said upper rolls with respect to said lower rolls, the improvement comprising a plurality of pivotal forked head means each having an upper and lower arm adapted to engage each of said bearing means, swivel shaft means supporting said forked head means and being parallel to the conveying direction of said printing plates, said upper arms of said forked head means being adapted to exert pressure on the top of said bearing means when said bearing means is in a lowered position, and said lower arms of said forked head means being adapted to support said bearing means in a raised position, means connecting one end of a toggle lever means to each forked head means, and means connecting the other end of said toggle lever means to a rotatable control shaft means which is parallel to the conveying direction of said printing plates.

Apparatus for developing printing plates comprising upper and lower

Disclosed is an apparatus for developing electrophotographic copying materials which eliminates the damage to flexible copying materials encountered with conventional developing apparatus. This apparatus comprises a pair of feed rollers for applying toner dispersion to the copying material, a guide plate for supporting the copying material within the apparatus, a distributor element for the toner dispersion which acts as a counter-electrode, means for adjustably positioning the distributor element in parallel relation above the guide plate, and a pair of squeegee rollers for removing excess toner dispersion from the copying material.

Apparatus for developing electrophotographic copying materials

An improved apparatus is disclosed for developing images on an electrophotographic copy sheet, characterized by the provision of a distribution roller having a soft porous peripheral surface for evenly spreading the toner dispersion on the electrophotographic copy sheet. The distribution roller is arranged between pairs of in-feed and squeeze roller means arranged in the developing chamber for transporting the electrophotographic sheet therethrough. Improved spray tube means are also provided for spraying the toner dispersion uniformly upon the peripheral surface of the upper in-feed roller.

Apparatus for developing electrophotographic materials

This invention relates to a printing frame for the exposure of printing plates comprising two closable components, flexible sheet means secured to one of said components and being adapted to press a printing plate and an original together and maintain them in close contact during exposure, and means for exerting air pressure on said flexible sheet means in order to press said printing plate and original together.

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Wiesbaden, Germany

Dieter Topfer