CH678458A5

CH678458A5 - Support frame for retaining flat section of film - has three parallel transverse bars, one resting on top of chemical bath etc.

Info

Publication number: CH678458A5
Application number: CH148789A
Authority: CH
Inventors: Bernard Ihringer; Dominique Leclerc
Original assignee: Bernard Ihringer; Dominique Leclerc
Priority date: 1989-04-19
Filing date: 1989-04-19
Publication date: 1991-09-13

Abstract

Support frame for retaining a flat section of film (G) during the various development processes consists of a first horizontal bar (A) with its ends able to rest on the opposite edges of a chemical bath (B), and a second horizontal bar (C) which is attached to the underside of the first one and is equipped with sliding clamps (E) for the film. A third bar (H) in a rectangular U-shape has its vertical sides (I) able to slide freely through holes in the first bar (A) and its horizontal section beneath the lower edge of the film and attached to it by further clamps (E). The clamps are in the form of dental film clips, which are held in position on the horizontal bars by rings (F). The first of the three bars (A) is made from PVC, while the other two are of stainless steel. ADVANTAGE - Adjustable to various film sizes, gives more reliable film retention without perforation as the film is passed from one developing process to another.

Description

       

  
 



  L'invention a pour objet un châssis porte-film plan pour installation de développement de films. 



  La plupart des installations de développement de films se composent d'un alignement de cuves contenant chacune le produit convenant à chaque phase de développement, un mécanisme assure le transport des châssis porte-films de cuve en cuve jusqu'à la fin du procédé; les fabricants d'installations sont nombreux, les installations sont toutes assez similaires, et donnent toutes d'assez bons résultats, ce qui n'est pas le cas des châssis porte-film plan actuels, dont les formes de construction provoquent des effets dont les conséquences peuvent être graves; ces principaux effets sont les suivants: 



  Certains châssis percent le film dans chaque angle d'un trou d'un à deux millimètres de diamètre pouvant se trouver à plus de huit millimètres du bord du film, ce qui soustrait du film une surface d'utilisation importante, devant être prise en considération avant la prise de vue, sous peine de voir son sujet percé au quatre angles... 



  Tous les châssis porte-films plans provoquent des turbulences dans les bains, se traduisant sur les films par des zônes plus ou moins bien développées, les films étant quelques fois inutilisables; ces châssis ne permettant pas un bon égouttage entre chaque cuve, il en résulte un transport de chimie provoquant quelques fois des traînées gênantes sur le film et une altération plus rapide des chimies; ces châssis ne s'adaptent pas aux différents formats de films, chaque châssis est construit pour un format bien déterminé. 



  L'invention a pour but de pallier aux inconvénients cités ci-dessus. Ces buts sont atteints au moyen du châssis porte-film plan selon l'invention, défini à la revendication 1. 



  L'invention sera mieux comprise à la lecture de la description d'un exemple de réalisation donné en regard de la figure unique qui représente une vue du châssis porte-film plan. Comme on le voit sur la figure, la barre transversale A pose par ses extrémités sur les bords B de la cuve; la barre C fixée au moyen de vis D ou autre moyen fiable à, et sous la première barre A, est équipée de pinces coulissantes E maintenues en position par les rondelles F, fixant la partie supérieure du (des) film plan G; la barre H dont les deux parties verticales I coulissent librement dans les trous K légèrement plus grands de la barre A, et se terminent par des arrêts L destinés à l'empêcher de ressortir de la barre A, cette barre H est également équipée de pinces E et de rondelles F fixant la partie inférieure du film plan, le poids de la barre H suffit à maintenir le film légèrement tendu. 



   Les deuxième et troisième barres horizontales ont été éxécutées en barre ronde, choisie pour sa forme ne créant pas de turbulence néfaste à une bonne qualité de développement et favorisant un bon égouttage. 



  Les pinces genre "Kodak Dental Film Clip" offrent, de par leur construction, le double intérêt de servir de butée obligeant l'opérateur à pincer le film au bon endroit, et de maintenir le film sans le percer. 



  
 



  The subject of the invention is a flat film holder chassis for a film development installation.



  Most film development installations consist of an alignment of tanks, each containing the product suitable for each development phase, a mechanism ensures the transport of the film-carrying frames from tank to tank until the end of the process; the manufacturers of installations are numerous, the installations are all quite similar, and all give fairly good results, which is not the case with current planar film-holding frames, the construction forms of which cause effects whose consequences can be serious; these main effects are:



  Some frames pierce the film in each corner of a hole of one to two millimeters in diameter which can be more than eight millimeters from the edge of the film, which subtracts from the film a large surface of use, which must be taken into consideration. before shooting, on pain of seeing his subject pierced at four angles ...



  All the flat film-carrying frames cause turbulence in the baths, resulting on the films by more or less well-developed zones, the films sometimes being unusable; these frames do not allow a good drainage between each tank, this results in a transport of chemistry sometimes causing annoying streaks on the film and faster deterioration of chemistry; these frames do not adapt to different film formats, each frame is built for a specific format.



  The invention aims to overcome the drawbacks mentioned above. These aims are achieved by means of the flat film-carrying chassis according to the invention, defined in claim 1.



  The invention will be better understood on reading the description of an exemplary embodiment given with reference to the single figure which represents a view of the flat film-carrying chassis. As seen in the figure, the crossbar A poses by its ends on the edges B of the tank; the bar C fixed by means of screws D or other reliable means to, and under the first bar A, is fitted with sliding clamps E held in position by the washers F, fixing the upper part of the flat film (s) G; the bar H, the two vertical parts of which I slide freely in the slightly larger holes K of the bar A, and terminate in stops L intended to prevent it from coming out of the bar A, this bar H is also equipped with pliers E and washers F fixing the lower part of the flat film, the weight of the bar H is enough to keep the film slightly stretched.



   The second and third horizontal bars were executed in a round bar, chosen for its shape which did not create harmful turbulence for a good quality of development and favored good drainage.



  Pliers like "Kodak Dental Film Clip" offer, by their construction, the double advantage of serving as a stop forcing the operator to pinch the film in the right place, and to hold the film without drilling it.

Claims

1. Flat film frame for installation for developing films comprising a succession of tanks containing the various baths specific to each development phase, characterized in that it comprises: a first horizontal bar (A) serving as support and intended to be supported by its ends on the edges (B) of a tank of the development installation, a second horizontal bar (C) fixed to the first bar and under it, equipped with clamps (E) sliding along of this bar to adapt to the format of the film treated, a third bar folded into a U, the two vertical parts of which (I) slide freely through the first horizontal bar (A), thus automatically adapting to the format of the film, the horizontal part (H) of this third bar also being fitted with sliding clamps.

2.

Flat film frame according to claim 1, characterized in that the clamps hold the flat film without piercing it, which has the effect of keeping the entire surface of the film intact and available.

3. flat film frame according to claims 1 and 2, characterized in that the clamps are held in the position chosen by the operator, by means of washers (F) of acid-resistant synthetic material, deposited on the second and third horizontal bars.

4. flat film holder frame according to one of claims 1 to 3, characterized in that the first bar is made of polyvinyl chloride, the second and third stainless steel. 1. Flat film frame for installation for developing films comprising a succession of tanks containing the various baths specific to each development phase, characterized in that it comprises: a first horizontal bar (A) serving as support and intended to be supported by its ends on the edges (B) of a tank of the development installation, a second horizontal bar (C) fixed to the first bar and under it, equipped with clamps (E) sliding along of this bar to adapt to the format of the film treated, a third bar folded into a U, the two vertical parts of which (I) slide freely through the first horizontal bar (A), thus automatically adapting to the format of the film, the horizontal part (H) of this third bar also being fitted with sliding clamps. 2.

Flat film frame according to claim 1, characterized in that the clamps hold the flat film without piercing it, which has the effect of keeping the entire surface of the film intact and available. 3. flat film frame according to claims 1 and 2, characterized in that the clamps are held in the position chosen by the operator, by means of washers (F) of acid-resistant synthetic material, deposited on the second and third horizontal bars. 4. flat film holder frame according to one of claims 1 to 3, characterized in that the first bar is made of polyvinyl chloride, the second and third stainless steel.