Patent
1981-04-09
1983-03-01
Hix, L. T.
354319, G03D 506
Patent
active
043753256
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention refers to a machine for development of exposed pictures.
A number of different more or less automatized machines, which are all expensive to obtain and service and which are also difficult to clean have earlier been proposed for such development of exposed pictures.
2. Description of the Prior Art
Thus, there are machines, which comprise a tub through which the items to be developed are transferred and to which tub the different liquids necessary for the development process are supplied alternately. An advantage of this type of machine is that its dimension can be rather small, but it gives at the same time the drawback that the different liquids have to be introduced into and to be removed from the process tub between each stage of the development. In other types of machines the process tub has been subdivided into different receptacles, in which the different liquids have been contained constantly. In order to be able to transfer the objects to be developed through the liquid in a suitable manner it has thereby been necessary to use a comparatively large quantity of liquid and to allow the pictures to move in this liquid over a cylinder or the like. As most of the process liquids are rather expensive this is a clear drawback and the need of energy for maintaining the present liquid quantity at a correct temperature will furthermore increase. A further drawback with the pictures being transferred through the liquids is the risk of contamination of a liquid with the previously used liquid at the same time as the immersion of the pictures in the liquid means that the entire paper, i.e. also the surface which has no emulsion, will be wet by the liquids in question, which means an increased drying time. A drawback common for earlier known developing machines of this kind is also that the separate parts thereof are so difficult to reach that the possibilities of cleaning the machine are extremely limited.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide a machine for development of exposed pictures and of the type incorporating a tank, which is subdivided into a plurality of receptacles which are sealed off from each other and intended to contain required process liquids, and in which each receptacle is provided with a cylinder, which is rotatable about a mainly horizontal axis of rotation, which cylinders are adapted to be partly immersed in the liquid in its associated receptacle and to effect during its rotation a contact between the pictures to be developed and the different liquids in the intended order, and which machine is comparatively inexpensive to manufacture and to service at the same time as it to a high extent eliminates the drawbacks mentioned hereabove.
This is according to the invention achieved in that said receptacles are arranged in a continuous row with said cylinders arranged with their axes of rotation along a common straight line, whereby means are arranged for continuously transferring the pictures to be developed in a path perpendicular to the cylinder's direction of rotation along a portion of each cylinder situated above the liquid level in each receptacle and preferably diametrically opposite the portion of the cylinder immersed in the liquid, whereby the pictures in proper order will contact the liquid layer which each cylinder during its rotation will carry to its said portion above the liquid level.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will hereinafter be further described with reference to some embodiments of the invention shown in the accompanying drawings, wherein
FIG. 1 shows in a schematic planar view from above the tank with the driving device forming part of the development machine according to the invention,
FIG. 2 shows in a schemation side view one embodiment of the development machine according to the invention,
FIG. 3 is a schematic perspective view of the embodiment according to FIG. 2 of the development machine according to the invention shown partly in section,
REFERENCES:
patent: 3453944 (1969-07-01), Eng
patent: 3575101 (1971-04-01), Smith et al.
patent: 3682079 (1972-08-01), Casson
Hix L. T,.
Mathews Alan
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