Photographic developing apparatus
AssigneeAddressograph Multigraph Corporation
InventorRobert Louis Marie Vanderheyden
Life of this patent
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Abstract
In a liquid supply system for a developing apparatus, a liquid absorbing wick construction which is formed of polyester fibers matted together to form a liquid absorbant pad which, when it is pressed against the surface of a rubber applicator roller, feeds and supplies liquid to the rubber roller surface. The fibers are formed from polyethylene terephthalate resins which are formed into a unitary pad by "needling" the fibers together and which is then enclosed either entirely or partially by a sheath so that the fibers are retained on the pad.
Claims4
In a developing apparatus for developing two-component diazotype materials by the application thereto of a controlled amount of liquid developer comprising an applicator roller, means for metering an excess amount of liquid carried on said applicator roller to establish a metered liquid zone thereon, and liquid supply means for applying said excess amount of liquid to the applicator roller and recovering any excess liquid, the improvement comprising:
- a reservoir having a floor and a wall portion adjacent said applicator roller for holding a supply of said liquid;
- a liquid supply element partially immersed in said reservoir comprising a core of fibrous matted material capable of absorbing said developing liquid, at least a portion of said core being arranged to contact the applicator roller, and a sheath of porous, liquid absorbing material enclosing at least that portion of the core arranged to contact said applicator roller;
- and
- clamping means for securing said liquid supply element in an upstanding condition against said wall portion including a spacer means disposed between the wall portion and said supply element forming a channel therebetween for guiding any liquid flowing from said applicator roller in advance of said liquid supply means for collecting and directing said recovered liquid into said reservoir.
In a developing apparatus for developing two-component diazotype material by the application thereto of a controlled amount of liquid developer comprising an applicator roller, means for metering an excess amount of liquid carried on said applicator roller to establish a metered liquid zone thereon and liquid supply means for applying said excess amount of liquid, the improvement comprising:
- a liquid supply element comprising a core of fibrous matted material having the following physical properties:
- WEIGHT:
- 2,000 grams per sq. M .+-. 5% TENSILE STRENGTH (machine direction):
- 53 kgs. per sq. M .+-. 5% ELONGATION (machine direction):
- 93% .+-. 5% TENSILE STRENGTH (transverse direction):
- 107.4 kgs. per sq. m. .+-. 5% ELONGATION (transverse direction):
- 46% .+-. 5% AIR FLOW RESISTANCE:
- 2 mm. of water gauge for an air flow of 2 m.sup.3 /m.sup.2 /min. through a 10 mm. layer thickness.
Dependencies are inferred from the claim text.