EP0181699B1 - Cuves de développement photographique - Google Patents

Cuves de développement photographique Download PDF

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Publication number
EP0181699B1
EP0181699B1 EP19850307215 EP85307215A EP0181699B1 EP 0181699 B1 EP0181699 B1 EP 0181699B1 EP 19850307215 EP19850307215 EP 19850307215 EP 85307215 A EP85307215 A EP 85307215A EP 0181699 B1 EP0181699 B1 EP 0181699B1
Authority
EP
European Patent Office
Prior art keywords
film
rib
spiral
plate
holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19850307215
Other languages
German (de)
English (en)
Other versions
EP0181699A1 (fr
Inventor
Richard Dunn
John Denton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PHOTAX (LONDON) PLC
Original Assignee
PHOTAX (LONDON) PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PHOTAX (LONDON) PLC filed Critical PHOTAX (LONDON) PLC
Publication of EP0181699A1 publication Critical patent/EP0181699A1/fr
Application granted granted Critical
Publication of EP0181699B1 publication Critical patent/EP0181699B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/02—Containers; Holding-devices
    • G03D13/08—Devices for holding exposed material; Devices for supporting exposed material
    • G03D13/14—Devices for holding exposed material; Devices for supporting exposed material for holding films in spaced convolutions

Definitions

  • This invention relates to a film holderfor use in a photographic developing tank as claimed in Claim 1.
  • Photographic processing tanks for processing lengths of exposed photographic film are well known and they consist essentially of a light-tight tank in which the film, arranged in a spiral coil, is supported on a holder.
  • the film is loaded on to the holder under darkroom conditions, such as safelight illumination or in total darkness.
  • the holder is then placed in the tank and the tank is made light-tight. Thereafter, the processing can be accomplished with the tank in normal lighting conditions.
  • the processing solutions are introduced in turn into the tank.
  • the tanks function with the minimum of processing solutions (dictated by the exhaustion rate of the processing solutions) and yet not only allow for rapid filling and emptying of the liquids, but also ensure that the formation of air bells on the film surface is inhibited to a maximum extent.
  • the processing solutions must be able to move freely over the film surface so that solutions which have been exhausted in certain areas of the film emulsion may be moved to other areas of the film. Similarly, solutions which have not been involved in a great deal of activity, and are, therefore, not exhausted, must be moved to those areas of the film where interaction with the film emulsion is greater. This periodic movement of the processing solution is conveniently brought about by completely inverting the processing tank at regular intervals.
  • U.S. Patent 2835181 describes a film handling reel, for use in a tank, which comprises a central column and a pair of annular plates mounted in spaced apart relation on the column. Each plate has a spirally arranged rib, orfilm directing means, mounted thereon. The plate has as a plurality of parts or orifices which extend through the plates.
  • U.S. Patent No. 2151907 describes a film processing device which consists of a reel comprising three discs. Two of the discs have a helical wall, defining a helical groove, formed on the face thereof, whereas the middle disc has a helical wall formed on both faces. Each of the three discs is provided with openings through the faces thereof in order to allow for the passage of liquid.
  • the film holder for use in such a tank comprises a central column and a pair of annular plates mounted in spaced apart relation on the column. Each plate has a number of radially extending ribs which carry a further rib arranged in a spiral. The film is carried in the holder with the lateral edges of the film in the spaces between the turns of the respective spirally arranged further ribs.
  • the further rib on each annular plate has such a depth relative to the radial ribs thereon to provide extra strength thereby allowing the spacing between adjacent turns of the further rib to be increased.
  • Some of the advantages of the invention are (a) that the speed at which the tank may be filled and emptied is increased;
  • the shaped further rib produces a "venturi effect" which assists in the flow of processing liquid. All these advantages are achieved without resorting to a tank of larger volume than that generally required for satisfactory processing of 35 mm and/or 120/220 roll film lengths and widths.
  • a holder for a film processing tank comprises a generally cylindrical hollow tube 1 having an enlarged foot 3.
  • a pair of annular plates 5, each with an integral stub-column 7, are mounted on the tube 1.
  • the two stub-columns are arranged in overlapping relation so that the annular plates are in spaced apart relation.
  • the amount of overlap of the stub-columns can be adjusted so as to vary the spacing between the plates 5 and thereby accommodate films of different widths.
  • Each annular plate has a plurality of radially extending ribs 9 and these ribs support a further rib 11 integral therewith which is arranged on the ribs 9 in the form of a spiral.
  • each radial rib 9 is of generally rectangular cross-section with one side providing a support surface forthe film. One of the corners 13 of the support surface is chamfered.
  • Each turn of the further rib 11 has a first part 15 which projects beyond the support surface of the ribs 9 and a second part 17 which extends almost to the side of the rib which is opposite the support surface.
  • Adjacent sides of adjacent turns of thefurther rib diverge at the first part 15 and also diverage at the second part 17 so that the space 19 between adjacent turns is in the form of a venturi.
  • the further rib is of more rigid construction than has been known heretofore and this permits the spacing between adjacent turns of the rib to be increased.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Photographic Developing Apparatuses (AREA)

Claims (2)

1. Porte-film pour une cuve de développement photographique, lequel porte-film comprend une colonne centrale (1) et deux plaques annulaires (5) montées à une certaine distance l'une de l'autre sur la colonne, chaque plaque incluant un certain nombre de nervures de support radiales (9) qui portent une nervure hélicoïdale (11) formant un canal en hélice entre ses spires pour retenir le bord du film, ladite nervure hélicoïdale présentant une section allongée qui a une première partie (15) s'effilant vers l'intérieur dans la direction axiale faisant face à l'autre plaque, et une seconde partie (17) qui s'effile vers l'intérieure dans la direction axiale orientée à l'opposé de l'autre plaque, ladite seconde partie s'étendant à travers la majeure partie de la profondeur de la nervure radiale (9), vers le côté qui est opposé à la surface de support.
2. Porte-film selon la revendication 1 caractérisé en ce que chaque nervure radiale a une surface biseautée (13) faisant face au bord antérieur du film qui est avancé dans l'hélice, afin de faciliter l'entrée du film.
EP19850307215 1984-10-09 1985-10-09 Cuves de développement photographique Expired EP0181699B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8425436 1984-10-09
GB848425436A GB8425436D0 (en) 1984-10-09 1984-10-09 Photographic processing tanks

Publications (2)

Publication Number Publication Date
EP0181699A1 EP0181699A1 (fr) 1986-05-21
EP0181699B1 true EP0181699B1 (fr) 1989-03-22

Family

ID=10567890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850307215 Expired EP0181699B1 (fr) 1984-10-09 1985-10-09 Cuves de développement photographique

Country Status (3)

Country Link
EP (1) EP0181699B1 (fr)
DE (2) DE3569046D1 (fr)
GB (1) GB8425436D0 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2359379A (en) * 2000-02-04 2001-08-22 Harry Graham New Photographic print or film holder

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151907A (en) * 1938-01-20 1939-03-28 Fink Roselieve Co Inc Film processing device
US2835181A (en) * 1953-12-14 1958-05-20 Albert R Seeley Fluid circulating film handling reel and tank

Also Published As

Publication number Publication date
EP0181699A1 (fr) 1986-05-21
GB8425436D0 (en) 1984-11-14
DE181699T1 (de) 1987-02-05
DE3569046D1 (en) 1989-04-27

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