Photographic developing apparatus

Claim 2

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.

Claim 3

The developing apparatus as claimed in claim 1 wherein said liquid supply element is L shaped having a foot section and leg portion wherein said foot section resides against restraining means on the floor of said reservoir.

Claim 4

The developing apparatus as claimed in claim 1 wherein said spacer means includes vertically extending ribs for maintaining said spacer means in spaced relation to said wall portion.

Claim 5

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.

Claim 6

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.