EP0124820A1 - Méthode et dispositif pour le développement photographique par diffusion de matériaux en deux feuilles - Google Patents

Méthode et dispositif pour le développement photographique par diffusion de matériaux en deux feuilles Download PDF

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Publication number
EP0124820A1
EP0124820A1 EP84104562A EP84104562A EP0124820A1 EP 0124820 A1 EP0124820 A1 EP 0124820A1 EP 84104562 A EP84104562 A EP 84104562A EP 84104562 A EP84104562 A EP 84104562A EP 0124820 A1 EP0124820 A1 EP 0124820A1
Authority
EP
European Patent Office
Prior art keywords
sheets
sheet
pair
rollers
positive
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.)
Granted
Application number
EP84104562A
Other languages
German (de)
English (en)
Other versions
EP0124820B1 (fr
Inventor
Immo Dr. Boie
Guido Kovacic
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.)
Agfa Gevaert AG
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Agfa Gevaert AG
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Filing date
Publication date
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of EP0124820A1 publication Critical patent/EP0124820A1/fr
Application granted granted Critical
Publication of EP0124820B1 publication Critical patent/EP0124820B1/fr
Expired legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D9/00—Diffusion development apparatus

Definitions

  • the present invention relates to a method and an apparatus for developing photographic weiblattdiffusionsmaterialien Z, passed through a developing liquid in which a positive sheet and secured thereto exposed negative sheet and then squeezed to successive image transfer.
  • a negative sheet or donor sheet with a motif is exposed imagewise and wetted with a developing liquid or an activator and then pressed congruently onto a positive or receiver sheet.
  • an image-forming substance for example a silver salt or a dye, diffuses from the imagewise exposed negative sheet into the positive sheet. After separating the leaves, a positive image is obtained.
  • the positive sheets are therefore cut larger in length and width (approx. 5 mm) than the associated negative sheets and then trimmed all around after processing to compensate for the inaccurate fit. In addition to the additional work involved, there is also a considerable loss of material.
  • the method and the device are quite cumbersome to use.
  • the swivel-out part is moistened with developer and already wets an area of the positive and negative sheet outside the device during the attachment of the two sheets to this part, so that the sheets can stick to the part, but at least at the contact points for a long time exposed to the developer liquid are.
  • the invention is therefore based on the object to provide a method and a device of the initially mentioned type with which it is easily possible l i is to wet a positive and an exposed negative sheet to the image transfer with a developing liquid is uniformly and the two Bring the sheets together exactly and squeeze each other so that the edges of the two sheets are exactly congruent.
  • this object is achieved for a process in that the positive and negative sheets are connected to one another flexibly and transversely to the direction of travel by an adhesive strip and are passed one after the other through the development liquid for wetting, after the sheets have been passed through by means of the developing liquid, the stiffness of the photographic material and the flexibility of the adhesive strip kink can be used together with a catch device for the first wetted sheet in order to bring about an independent V-shaped folding of the sheets around the adhesive tape kink and that the two sheets can be deflected with the V-shaped fold folded in front of a pair of nip rollers, grasped by them and squeezed together into a collecting tray.
  • the positive sheet is first introduced into the device, since this sheet survives an extended stay in the air without damage, while the residence time of the negative sheet moistened with developer should be as short as possible and independent of the respective image format.
  • the first sheet preferably the positive sheet
  • the subsequent negative sheet which is connected to the positive sheet by an adhesive tape arranged transversely to the direction of travel, bulges the positive sheet and itself, so that both Blä t - ter along the glue line to form a V-shaped bend, which is pressed by the deflection device between two nip rollers and is detected by this.
  • the squeeze rollers firmly press the two sheets together so that the image transfer can take place between the sheets wetted with developer liquid.
  • the connected sheets are conveyed into an outlet channel and through this into a collecting tray, from which they are removed after a short dwell time and separated from one another.
  • the positive sheet can then be further treated, for example watered.
  • the sheets are preferably wetted in a development tray through which the sheets are pushed or pulled.
  • the bowl can be provided with elevations in the running direction of the leaves so that only a linear contact takes place between the leaves and the bowl bottom.
  • the development shell between the first and the second pair of rollers can be provided with two guide devices arranged one above the other, between which the positive and negative sheets are reliably guided by the developer.
  • These guide devices consist of round bars arranged next to one another, but can also consist of perforated sheets or grids which are designed in such a way that the developer can flow through and the sheets cannot be jammed.
  • the sheets through the developer or activator bath can also be made by further rollers or pairs of rollers, as are customary in continuous development machines.
  • the adaptability of the device to a large number of formats is of great advantage.
  • the variety of formats is achieved on the one hand in that the positive and negative sheets can be connected to one another both on their longitudinal and on their transverse sides.
  • the stop for the first sheet inserted is adjustable in the collecting device and can be adapted to the respective formats.
  • the deflection device is arranged so as to be adjustable in its distance and angle to the path of the sheets. While in conventional two-sheet processing devices the smallest format to be processed must be larger in the running direction than the distance of the insertion roller from the squeezing roller, the transport-effective sheet length is doubled by gluing the two sheets together, so that smaller formats of the single sheets can also be processed.
  • An improvement in the passage properties of the sheets through the device is achieved in that all surfaces that come into contact with the already wetted sheets, such as the deflecting device, the collecting device or the surfaces of the discharge channel with elevations protruding into the path of the sheets, such as For example, rounded rails or knobs running in the direction of transport are provided, with which the leaves only one have linear contact and glide easily over it even when wet without jamming.
  • a negative sheet 1 is connected to a positive sheet 2 with an adhesive tape strip 3 along one edge.
  • the adhesive tape strip 3 is considerably thinner and therefore more flexible, so that the sheets 1, 2 can be easily folded up around their glued edge, but are firmly connected to one another.
  • the negative sheet 1 is exposed imagewise, for example with an enlarger (arrows). The image is viewed after development on positive sheet 2 in the direction of the arrow.
  • the sheets are glued so that their effectively coated surfaces are applied on one side and the adhesive tape 3 on the other side.
  • the interconnected negative and positive sheets can be produced by longitudinally cutting a web with a negative coating and a web with a positive coating in a roll of the same width.
  • One roll each of negative and positive material is arranged next to one another on a device, unwound, and here a longitudinal edge of the positive material 2 is connected to the adjacent edge of the negative material 1 by means of an adhesive tape 3, and both webs are cut together in formats transverse to the direction of travel.
  • the interconnected sheets 1, 2 thus obtained can be stacked on top of one another and packed one after the other, such as a pair of sheets which is shown in FIG. 1.
  • each pair of sheets can be removed directly from the pack with the side to be exposed facing upwards and placed under an enlarger.
  • the conventional magnification frames can also be used here, since the negative and positive sheets are exactly the same size.
  • the layer sides of the sheets are identified by notches on the upper right edge. These notches form in the edge area of the positive sheet and have a disruptive effect. The edges must therefore be trimmed. In the present method, no notches are necessary, since the layer sides of the sheets 1, 2 are assigned to one another by the adhesive tape 3.
  • the negative sheet 1 which is generally provided with a much darker surface, can be easily recognized by the mostly white positive sheet 2 during exposure, so that incorrect handling can be corrected at any time.
  • connection of the negative sheet 1 with the positive sheet 2 can be done with commercially available plastic or paper adhesive tapes.
  • the adhesive tape 3 can be applied centrally to the back of both sheets 1, 2, as shown in FIG. 1.
  • Fig. 1b the adhesive tape 3 is applied in such a way that only a small part of the adhesive tape 3 is glued to the positive sheet 2 and a larger part to the negative sheet 1.
  • the positive sheet 2 can be separated from the negative sheet 1 so that no adhesive tape 3 remains on the positive sheet.
  • 1c shows an embodiment for the adhesive tape 3, in which the adhesive tape is provided with a perforation 3 'and the negative and positive sheets 1, 2 can be separated from one another particularly easily after the image transfer.
  • the developer 6 covers the entire surface of the sheets 1, 2 again as a liquid bead as a result of the squeezing process and ensures a further improvement in the wetting.
  • the device for developing the above-described pair of sheets from positive and negative sheets 1, 2 is shown in FIG. 3. It contains a development shell 5 which is filled with a developer 6.
  • the developer can be a photographic developer or an activator, e.g. be a potash or a sodium hydroxide solution.
  • the developer shell 5 is inserted into the device so that it can be removed for cleaning.
  • the device shown can be supplemented by known devices, such as a developer bath heater with thermostat, to keep the temperature constant by means of a circulation pump for bath circulation and increased use of the developer and an additional developer tank (not shown).
  • known devices such as a developer bath heater with thermostat, to keep the temperature constant by means of a circulation pump for bath circulation and increased use of the developer and an additional developer tank (not shown).
  • the additional devices mentioned are not necessary, since the temperature has only a minor influence on the image quality and is developed at normal room temperatures of 18 to 22 ° C.
  • the activators are used up very slowly, so that, depending on the shell size, a large to very large number of images with a shell filling can be generated.
  • a first pair of rollers 4 is arranged on the inlet side of the device, to which the positive sheet 2 is fed by hand for development.
  • a second pair of rollers 8 is provided, which takes over the first immersed sheet 2, transports it further and squeezes out excess developer 6 and allows it to run back into the shell 5.
  • the blades 1, 2 can slide along the bottom of the shell to the second pair of rollers 8 if the base of the shell is provided with upwardly raised guide rails in the direction of travel of the blades, so that the blades 1, 2 are in flat contact with the bottom of the shell 5 prevent (not shown).
  • FIG. 3 shows a preferred embodiment in which two guide devices 7 are arranged between the roller pairs 4, 8, between which the sheets 1, 2 are passed through the developer 6.
  • the guide devices 7 consist, for example, of round bars which are parallel to one another in the running direction of the blades 1, 2 arranged and connected to each other as a removable insert. Between the guide devices 7, the blades are guided safely and without substantial friction from the first pair of rollers 4 to the second pair of rollers 8.
  • the arrangement of the guide device it can be achieved that even smaller formats, the double length of which is somewhat longer than the longest distance between the roller pairs 4, 8 can still be developed by the guide device 7 with the device.
  • the number of format sizes which can be processed with the device is therefore considerably greater than that which can be processed with the known devices.
  • all image formats between 9x12 cm and 30x40 cm can be processed.
  • the smaller formats such as 9x12 cm and 13x18 cm
  • two double sheets can advantageously be introduced into the device at the same time and developed at the same time.
  • the 13x18 cm and 24x30 cm formats can be processed with both their long and short sides ahead.
  • the device can also be designed for larger formats with wider rollers or for photo amateurs with narrower rollers for smaller formats.
  • a collecting device 11 which consists of a simple flat channel and with a for different For mate adjustable stop 12 is provided and is provided for temporarily receiving the first wetted positive sheet 2.
  • a deflection device 9 which is adjustable in its distance and angle to the straight path of the positive sheet 2 between the second pair of rollers 8 and the collecting device 11.
  • the surface of the deflection device 9 facing the leaves is shaped such that after the front edge of the positive leaf 2 abuts against the stop 12, the bulging leaves 1, 2 form a V-shaped bend 14 which is directed towards a pair of nip rollers 10 .
  • the deflection device guides the V-shaped bend 14 in the direction of the gap between the squeeze rollers 10 with the aid of the negative sheet 1.
  • the squeeze rollers 10 can be driven together with the roller pairs 4 and 8 and at the same speed by hand or by an electric motor.
  • the rollers are advantageously made of rubber or a soft plastic or coated with such a material to ensure that the sheets are transported smoothly and smoothly.
  • One of the roller pairs 4, 8, 10 can be driven in each case and the second roller can be pressed resiliently against the driven roller (not shown).
  • the surfaces with which the sheets come into contact can be like the surfaces Steering device 9, the collecting channel 11 and the discharge channel 13 may be provided with slide rails 16 in the running direction of the leaves.
  • the slide rails 16 can be protrusions such as rails or knobs protruding into the path of the leaves.
  • An outlet channel 13 is arranged under the pair of German rollers 10, into which the pair of squeeze rollers 10 conveys the precisely merged and pressed sheets 1, 2.
  • a collecting tray 15 into which the developed leaves 1, 2 fall and can be removed for separation after the image transmission.
  • the positive sheet 2 is separated for further treatment, watered and dried.
  • the use of the device is extremely simple.
  • the folded negative and positive sheets 1, 2 are removed from the packaging, the negative sheet is exposed, the sheets 1, 2 are unfolded and are guided with the positive sheet 2 in advance into the slot of the device in which the first transport rollers 4 grasp the sheet 2 and both Pull sheets 1, 2 into the device.
  • the two sheets 1, 2 leave the device folded through the discharge channel 13 and are deposited in the collecting tray 15.
  • the required immersion time of the leaves is a few seconds, for example 10 seconds, so that this ent wrapped double sheet of negative and positive sheet 1,2 is ejected from the device after 20 to 30 seconds, depending on the format size.
  • the first sheet the positive sheet 2
  • the first pair of rollers 4 slides for about 10 seconds through the developer 6 and is gripped by the second pair of rollers 8, which now covers the remaining part the sheet 1, 2 passes through the developer 6 and pushes the first positive sheet 2 into the collecting device 11, while the negative sheet 1 continues to be conveyed by the second pair of rollers 8.
  • the first positive sheet 2 reaches the stop 12 and begins to bulge due to its rigidity due to the pressure of the second sheet 1.
  • the connection point of the sheets 1, 2 bends along the flexible adhesive strip 3 and forms a V-shaped kink 14, the tip of which points in the direction of the pair of squeeze rollers 10.
  • the surface of the sheet 1 slides arched along the deflection device 9 and guides the V-shaped kink 14 directly into the gusset the squeeze rollers 10, which capture the kink 14 and fold and squeeze the two sheets and convey them out of the device.
  • Fig. 3 the device is shown so that. the folded sheets 1,2 are discharged downwards.
  • the pair of sheets 1, 2 can also be guided upwards through a channel.
  • the illustrated shell wetting of the sheets 1, 2 with developer liquid can be replaced by spray wetting, the two sheets being sprayed with developer from one side through nozzles.
  • the developer can also be applied to the surface of the sheets 1, 2 by rolling so that only the layer sides of the sheets are wetted.
  • the described method and the device can be used in offset technology to create proofs, copy copies, positives, negatives, intermediate layers.
  • the method and the device for producing color images according to the two-sheet color diffusion method can be used in order, for example, to create a color positive image from a slide over an enlarged negative sheet.
  • the exposure of the negative sheet can also be carried out in a cassette camera or in a repro camera or in contact with the original, in addition to the magnification device already mentioned.
  • D are of the same size a, the negative and positive sheet of the sheet pair, the pair of blades can be inserted for the exposure in the cassette and a camera are fed to the exposure of the device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP84104562A 1983-05-04 1984-04-24 Méthode et dispositif pour le développement photographique par diffusion de matériaux en deux feuilles Expired EP0124820B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833316267 DE3316267A1 (de) 1983-05-04 1983-05-04 Verfahren und vorrichtung zur entwicklung von photographischen zweiblattdiffusionsmaterialien
DE3316267 1983-05-04

Publications (2)

Publication Number Publication Date
EP0124820A1 true EP0124820A1 (fr) 1984-11-14
EP0124820B1 EP0124820B1 (fr) 1987-01-07

Family

ID=6198133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104562A Expired EP0124820B1 (fr) 1983-05-04 1984-04-24 Méthode et dispositif pour le développement photographique par diffusion de matériaux en deux feuilles

Country Status (4)

Country Link
US (1) US4532201A (fr)
EP (1) EP0124820B1 (fr)
JP (1) JPS59210438A (fr)
DE (2) DE3316267A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0216358Y2 (fr) * 1986-07-18 1990-05-07
JPS6472162A (en) * 1987-09-11 1989-03-17 Fuji Photo Film Co Ltd Heatdevelopable transfer method and device therefor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1091432B (de) * 1958-08-28 1960-10-20 Agfa Ag Entwicklungsgeraet fuer das Silbersalz-Diffusionsverfahren
GB1037051A (en) * 1962-01-23 1966-07-27 Block & Anderson Ltd Improvements in or relating to photo-copying methods and apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH375609A (de) * 1960-02-01 1964-02-29 Photorapid Ag Verfahren zum Entwickeln von Reproduktionen und Einrichtung zur Ausübung des Verfahrens
US4223991A (en) * 1979-04-06 1980-09-23 Eastman Kodak Company Image-transfer processor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1091432B (de) * 1958-08-28 1960-10-20 Agfa Ag Entwicklungsgeraet fuer das Silbersalz-Diffusionsverfahren
GB1037051A (en) * 1962-01-23 1966-07-27 Block & Anderson Ltd Improvements in or relating to photo-copying methods and apparatus

Also Published As

Publication number Publication date
DE3316267A1 (de) 1984-11-08
DE3461958D1 (en) 1987-02-12
JPS59210438A (ja) 1984-11-29
EP0124820B1 (fr) 1987-01-07
US4532201A (en) 1985-07-30

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