DE1522878A1 - Processing apparatus for photographic sheet or web materials - Google Patents

Description

DR. E. WIEGAND DIPL-ING. W. NIEMANN

DR. M. KÖHLER DIPL-ING. C. GERNHARDT

MÖNCHEN HAMBURG

phone: 55 5 * 76 8000 MUNICH December 15, 1966

TELEGRAMS! CARPATENT NUSSBAUMSTRASSE

W. 12 398/66 15 / Never

Ilford Limited

Ilford, Essex (England)

Processing device for photographic sheet or web materials

The invention relates to photographic processing apparatus and in particular to a device for processing photographic sheet or web-shaped, exposed gelatin-halosilver materials for use in offices or the like.

When treating a photographic, exposed Halogen silver materials are usually converted into a developer solution to develop the latent image and then immersed in a fixing bath to remove inexposed silver halide.

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Once the developer has been incorporated into the emulsion, the material can be removed by simply wetting the emulsion an activator solution, which is usually an alkaline solution of high pH, and then introducing the material in a stabilizer solution that does not remove the unexposed silver halide, but in a proportionate way light-insensitive complex transferred, treated. The latter type of material can be treated quickly and conveniently and for this reason this material proved to be of great value to νΌη in the field of copying documents for office use and also for the rapid production of positive ones Copies from negatives.

In order to make use of the ease of handling properties of developer-containing silver halide materials have been designed various forms of treatment devices. In some of these, the photographic material coated is developed by passing it between a pair of rollers, the lower one of which, with the emulsion surface facing down or the bottom roller is partially immersed in an activator solution. The developed photographic material then becomes whole immersed in a stabilizer solution and performed by dried by a squeegee. However, others became Forms of treatment devices e ȣ feh \ fceTr, +) in which only one side of the exposed photographic material (agent) is moistened with the activator solution. With this species

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of devices is the sheet or web-shaped exposed photographic material over the top the activator solution application rollers out, with no treatment solution on the back of the sheet or web-shaped Material is applied. In some forms of devices of this type, both the activator and also apply the stabilizer solution to the sheet or web-shaped photographic material with the aid of partially immersed Applied to rollers, the photographic sheet or web-like material held in place over the rollers by means of guide rails or a series of discs will.

In such types of treatment devices, the photographic Eahnenmaterial is conveyed through the device by a so-called "directional or flow drive" ( "tendeney drive ^'1}, that is, the rotating order" rollers as well as the application of treatment solution to the Emulsionsobe ^ face of the photographic sheeting (|

au oi ".
tend, sum drive '> ^ photographic material through the device. The driving force or tensile force applied by the applicator rollers to the photographic material varies considerably depending on the particular apparatus and to a significant extent on the physical properties of the photographic material being processed.

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It has been found that good traction can be obtained on a device of this type which has a row of guide rails with tooth-like projections thereon which partially protrude into the gap or space between the rollers. It has been found, however, that when such guide rails are used, the leading edge of a sheet or web of photographic material being processed tends to pick up a small portion of the processing solution from the bead formed between the sheet or web of photographic material and the applicator rollers , and also tends to flick part of the solution onto the protruding teeth or into the base or foot of the protruding teeth. When the next sheet or web of photographic material is fed through the apparatus, its leading edge or leading edge contacts these teeth and the processing solution reaches the back of the sheet or web of photographic material and forms a streak. If the treatment solution consists of an ^A ktivatorlösung, this strip changes color, the sheet or web of photographic material and causes some cases, a bending or warping of the material along which the front of the material is impaired by this strip. This is due to the fact that the high pH of this

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Way applied activator solution on the back of the photographic material by applying the Stabilizer solution is not neutralized.

The object of the invention is to provide a photographic Treatment device of the type described above, in which the tendency to produce streaks reduced on the back of the photographic material

is. - Jk

According to the invention is a processing apparatus for photographic sheet or sheet materials of this type is provided that behind a material inlet opening at least one set of two or more applicator rollers includes, which can be rotatably driven and with horizontally and parallel axes are mounted with the lower surface of each roller immersed in a bath of a treatment solution and a material handling system connected to each roller

for guiding a

is present that the material is suitable for the roller, ™ at least one material guide system is present which comprises two downwardly projecting guide means, of which both above the center line of the applicator roller on the 'Ma «· material inlet opening side of the application device are arranged, a guide device closer to the material « inlet opening is arranged and protrudes further down than the other guide device, namely by one

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sufficient amount to ensure that they are used to Leading the leading or leading edge and the whole Material is used on the roller and the other guide device only die'Ablauf- or Schlepplaante touches the material and serves to guide this edge onto the roller.

Under the term "all of the above Material "is to be understood as the material between the leading or leading edge and the trailing or trailing edge.

Preferably there are two sets of two or more applicator rolls. Preferably each applicator roll is connected in the device to a material guide system of the type described above.

According to a particular embodiment of the invention, a photog-raphische treatment apparatus for treatment of exposed sheet or web-shaped photographic materials is provided, the opening at least one set of two or more rotatably driven rolls horizontally with their axes and parallel to the inlet W to each other are attached, with the lower surface of each roller immersed in a bath of treatment solution

■ exposed dips, comprising the photographic material is held in place on the top of each roller by a material guide system which is two sets from above un (j4 on the inlet opening side of the roller includes downwardly protruding teeth, the teeth

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are arranged on such a set in greater proximity to the material inlet opening and continue downwards for » stand than the others "and in fact to a sufficient degree" maf to make sure they are used to guide the leading edge and serve all of the material on the roller and the other set only the trailing or trailing edge of the Material touches and serves to guide this edge on the roller.

According to another embodiment of the invention the teeth are carried on blocks or splints.

In a further embodiment of the invention, this comprises connected to at least one applicator roller Material guide system with two cross rails protruding downwards.

The term "photographic material" as used herein includes photographic sheet, sheet or strip material in web form on spools or rolls.

The invention is explained below with reference to the drawing explained in more detail.

Fig. 1 shows a front view in section of a treatment device according to the invention, in which the position of the teeth between the rollers can be seen.

Fig. 2 shows an enlarged view of the teeth.

Fig. 3 shows a perspective view of a supporting over the applicator rollers, in which the two

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Sets of teeth protruding from the carrier.

Fig. 4 shows a further embodiment of the device according to the invention, wherein the teeth are carried on rails which extend over the applicator rollers.

FIGS. 5 and 6 show an enlarged view of FIG Teeth when worn on the splints

FIG. 7 shows a top view of the device according to FIG. 4.

FIGS. 6 to 10 show alternative embodiments of the material guide system according to the invention in a perspective view.

According to Fig. 1, the treatment device comprises two sets of two rollers 1, 2 and j5, 4 in two baths 5 and 6, each containing a treatment solution. The solution in bath 5 consists of an activator solution and the solution in bath 6 consists of a stabilizer solution over all rollers and in connection with the roller to the right of them there are two sets of teeth protruding downwards, of which the first set 7 is downwards by a sufficient one The amount protrudes further than the second set 8 to ensure that it serves to guide the leading edge and all of the material onto the roller and that the second set 8 only touches the run-off edge of the material and serves to guide this edge onto the roller. Both sets of teeth are attached to a carrier 9.

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Pig. 2 shows an enlarged illustration of the honeycombs 1 and 2. Above them there is a tooth from the set of teeth J and a tooth from the set of teeth 8, which are fastened to the carrier 9. Also shown in this figure is a photographic sheet material 10 subjected to the processing. A bead of activator solution 12 is present between the web of photographic material 10 and roller 2. ,

When the web of photographic material 10 is guided through the device due to the action of the rotating rollers 1 and 2, it is guided from roller 1 onto roller 2 by the tooth. The web of photographic material 10 is capable of Arge Sets, wherein it has been passed through the tooth 7 ^au ^ the roller 2 and the drag "or trailing edge of this web 10 ^ I will now gezlgen to the other tooth. 8 Any of the processing solution 12 which is carried away from the drainage or traction edge of the photographic material is now deposited on the tooth 8. When a new photographic material sheet or web is passed through the device, it is passed through tooth 7 which has no processing solution. If any of the treatment solution has deposited on the teeth 8, then this will only be on the trailing or trailing edge of the new sheet or sheet of photographic material

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and it does not cause streak edges or marks.

In Pig. 3 shows the carrier 9 of the two sets of teeth 7 and 8 in a perspective illustration.

According to Fig. 4, the device again comprises two sets of two rollers 20, 21 and 22, 23, which in two Treatment solution tapes 24 and 25 are immersed, bath 24 contains an activator solution and the bath contains a stabilizer solution. Above the reels 1st a series of rails 30 and 31 are arranged, each Rail either a set of teeth 26 or a set of teeth 2-7; wearing. The teeth 26 stand around a sufficient Amount further down ahead than the set of teeth 27 to ensure they are used to guide the Leading edge and the main mass or all of the material are used on the roller and the teeth 27 only touch the run-off or trailing edge of the material and serve to guide this edge onto the roller. The rails are over the rollers are arranged so that the teeth 26 are in front of the teeth 27.

In Fig. 5, a rail 30 is shown on which the Teeth 26 are worn.

In Fig. 6, a rail 3I is shown on which the Teeth 27 are worn.

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Pig. Figure 7 shows a plan view of a device of this type, from which it can be seen how the rails 30 and 31 are arranged above the applicator rollers 20, 21, 22 and 23 are.

(Eg paper - paper) in a device of this type to be treated photographic sheet or web-shaped material is guided by the teeth 26 on the rollers, but the drain or trailing edge of a% such web after applying a treating solution of a roll against pulls the set of teeth 27 and in this way any amount of treatment solution that has been picked up by the rollers is deposited on that set of teeth. Accordingly, a photographic material processed in such an apparatus does not contain drops of processing solution applied to its leading edge by the protruding teeth 26.

In Figures 8-10, alternative forms of *

Cross rail guide means shown. In all three forms, the cross rail 3K is closer to the entry opening of the device and protrudes further down a sufficient amount than the rail 35 to ensure that it serves to guide the leading edge and the mass of material onto the roller and contacts the rail 35 only the run-off or trailing edge of the material and is used to guide this edge onto the roller. The direction of movement of the photographic material is indicated by an arrow.

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Claims (3)

- 12 · »Claims 1. Treatment device for photographic tubes sheet ·· or sheet-like materials with at least * eleventh behind a material inlet opening arranged set of two or more rotatably drivable rollers «the« it their axes arranged horizontally and parallel to one another are mounted in such a way that the lower surfaces of each roller are immersed in a bath of a treatment solution immersed «with a Mfterialv connected to each roller, guidance system is available «that for guiding the material, Suitable for the roller is "characterized" that there is at least one material guide system "that comprises two downwardly projecting guide means, both of which are attached above the center line of the applicator roller to the material inlet opening of the applicator device are «where one guide means is attached closer to the material inlet opening and protrudes a sufficient amount further downwards than the other guide means« to ensure «that it serves to guide the guide edge and the mass of material onto the roller and the other Guide means merely touches the run-off or trailing edge of the material and serves to guide this edge onto the roller. 909842/0646 2. Treatment device according to claim 1, characterized in that the material guide system has two sets encompassed by 'teeth. 3. Treatment device according to claim 1 or 2, characterized characterized in that the miterial guide system includes two downwardly projecting cross rails. 9098Λ2 / 06Λ6 -Vf- Blank page