Abstract:
An arrangement for developing photographic layer carriers has at least one container for accommodating a treating medium and having an uninterrupted wall, a pump for circulating the treating medium in the container and having a first part formed by the uninterrupted wall of the container and a second part associated with the first part, and a magnetic force-transmitting element located outside the container and magnetically acting upon a rotary body of the pump so as to rotate the same.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to arrangements for developing photographic layer carriers. More particularly, it relates to arrangements for developing photographic layer carriers, which have at least one container with a treating medium and a pump located inside the container and driven from outside of the container so as to pump the developing medium for circulation purposes. 
     Arrangements of the above-mentioned general type are known in the art. In the known developing arrangements or machines, the bath agitation is always performed by rotating the developing medium with the aid of a pump. The developing medium is withdrawn via an external conduit in which the pump is arranged through the bottom of the container, and then introduced into the container at a predetermined location. Another developing arrangement is also known from German Pat. No. 862,560. In this arrangement, the pump is located inside the container and is in a driving connection with an outside drive via a shaft extending from inside outwardly of the container. Such a construction has, however, a considerable disadvantage in the fact that the passage for the above-mentioned shaft in the container wall often becomes untight after a short time. As a result of this, the aggressive treating medium can escape from the container. Taking this into consideration, such arrangements are provided with complicated or expensive devices with external pumps. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide an arrangement for developing photographic layer carriers, which avoids the disadvantages of the prior art. 
     More particularly, it is an object of the present invention to provide an arrangement for developing photographic layer carriers, in which sealing problems do not take place. 
     In keeping with these objects, and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an arrangement for developing photographic layer carriers which has at least one container for accommodating a treating medium and having an uninterrupted wall, means for circulating the treating medium in the container and including a pump with a first part formed by the uninterrupted wall of the container, a second part associated with the first part, and a rotary body, and magnetic means for imparting rotation to the rotary body of the pump, wherein the magnetic means is located outside of the container and magnetically acts upon the rotary body of the pump to rotate the same. 
     When the arrangement is designed in accordance with the present invention, the container of the arrangement is completely tight. It is formed in correspondence with the bottom so that the pump is lowered into the bottom and does not disturb the transport movement of the layer carriers whereby the container can also be very small. When the arrangement is designed in accordance with the present invention, the cleaning expenses are very low, and the mounting and servicing of the arrangement is relatively simple. 
     In accordance with another feature of the present invention, the wall of the container has an outwardly extending portion which surrounds a first magnetic element of the rotary body of the pump and is in turn surrounded by a second magnetic element of the force-imparting element of the magnetic means. 
     In accordance with a further advantageous feature of the present invention, the wall of the container is provided with holding means for holding a housing of the force-transmitting element, and a retaining means for retaining a housing of the pump. The holding means and the retaining means may be formed as snapping means or spring means, respectively. 
     The arrangement may include several containers with circulating means and magnetic means, wherein the latter is driven from a common electric motor through a motion-transmitting element formed as a chain or a toothed belt. 
     Finally, the transmission of the motion to the force-transmitting element may be performed by gears mounted on the force-transmitting element and having different diameters in accordance with desired outputs of the pump for circulating the treating medium in a respective one of the containers. 
     The novel features which are considered characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of preferred embodiments when read in connection with the accompanying drawing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a view showing a section of an arrangement for developing photographic layer carriers in accordance with the present invention; and 
     FIG. 2 is a view showing a cross section of the arrangement including several developing containers. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     An arrangement for developing photographic layer carriers shown in FIG. 1 has a container 1 which is filled with a developing medium such as a treating liquid 2. The container 1 has a bottom wherein a pump 3 is arranged. The pressure side of the pump 3 opens into a pipe 4. The pipe 4 extends from the bottom of the container 1 upwardly and then is curved downwardly. At the end of the pipe 4, it has an opening facing toward the body of the liquid 2. The pipe 4 is mounted with the aid of a bracket 6 on a lateral wall of the container 1. 
     The bottom 1a of the container 1 is formed in accordance with the present invention as an uninterrupted bottom. The bottom 1a is formed so that it can receive the pump 3 at its one side and receive a magnetic drive for the pump at the other side. For improved identification, the bottom is hatched in black. The bottom 1a has an inwardly extending ring-shaped shoulder 1b formed so that a housing 7 of the pump 3 abuts against this shoulder. An inner ring-shaped raised portion 1c follows the shoulder 1b. The raised portion 1c forms a lateral wall of a pump chamber 8. An impeller 9 of the pump 3 rotates inside the pump chamber 8. 
     The ring-shaped raised portion 1c is connected with a cylindrical outwardly extending depression 1d which extends downwardly beyond the main part of the bottom 1a. The depression 1d serves for recieving a rotary body 10 of the pump, on which the impeller 9 is mounted. An annular magnet 11 is arranged inside the rotary body 10 and located substantially in the region of the cylindrical depression 1d. 
     The bottom 1a has a plurality of projections 1e which are arranged at the outer side of the bottom in a circular manner and have inwardly extending beads 1f. The projections 1e are elastic and serve for receiving a housing 12 of a force-transmitting element 13. A rotary member 14 is rotatably arranged on the force-transmitting element 13. The rotary member 14 has a shaft connected with a motor 19. An annular magnet 15 is arranged in the rotary member 14 and closely surrounds the outer wall of the cylindrical depression 1d. The annular magnet 15 is located in the region of the inner magnet 11. 
     For mounting, it is necessary to fit the pump 3 with its housing 7 onto the shoulder 1b, and the spring elements provided between the housing 7 and the bottom 1a reliably hold the pump. From outside, the force-transmitting element 13 is fitted over the cylindrical depression 1d, whereas a flange 12a of the housing 12 engages behind the bead 1f of the elastic projections 1e. Finally, the motor 19 is placed onto the force-transmitting element 13. 
     In operation, the motor drives the rotary member 14 in rotation, whereby the annular magnet 15 takes along in rotation the inner magnet 11 on the rotary body 10 of the pump 3. Thereby the pump 3 arranged above the bottom 1a acts upon the aspirated liquid through the pipe 4 toward the discharge opening 5 in the direction to the upper side of the container 1, whereby the liquid is urged for rotation and circulation. 
     Because of the integration of the bottom of the container into the pump, it has a special shape which can be produced as a synthetic plastic molded part in a relatively simple way. Such an arrangement is absolutely fluid-tight. For cleaning purposes, the pump 3 as well as the force-transmitting element can be removed from the bottom 1a of the container 1 with the aid, for example, of the same handle. 
     It is to be understood that the arrangement may be mounted not only on the bottom of the container 1, but instead on a lateral wall of the container or at any other location. 
     As can be seen from FIG. 2, the arrangement may have several containers for accommodating a treating medium which are arranged adjacent to one another, each provided with the pump 3 and the force-transmitting element 13. The arrangement has a common drive 19&#39;. In order to drive the force-transmitting element 13 from the common drive (the electric motor) 19&#39;, each force-transmitting element 13 is provided with a gear 17, and all gears 17 are connected with one another by a chain or a toothed belt 18. Thereby, each gear 17 is in connection with the drive motor 19&#39;. 
     The arrangement shown in FIG. 2 may be designed so as to provide different outputs from the pump arranged in the various containers. This can be advisable when the containers are utilized for various purposes or have different dimensions. In this case, the gears 17 associated with the pump 3 in various containers have different diameters so as to provide for different motion-transmitting ratios. 
     It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above. 
     While the invention has been illustrated and described as embodied in an arrangement for developing photographic layer carriers, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention. 
     Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art fairly constitute essential characteristics of the generic or specific aspects of this invention.