Abstract: Operation control device for photography printing and developing machines, wherein the images of negatives are projected on photographic paper, by exposing it, and wherein the exposed paper is then developed and printed. Device comprising central control means (23) communicating with the control unit (19) of each printing and developing machine (6, 7) and displaying means (monitor 17) for the negatives of each machine, contained into magazines (25), wherein such central control means (23) are adapted to set the data of the characteristics of the operative cycles to be carried out in the different machines and to control such cycles, independently from those of the other machines, and to activate at random every machine as soon as one operative cycle is ended, in order to permit a subsequent cycle to be carried out.

Abstract: On a plant for continuous development of photographic material, comprising a plurality of operative units (6, 7, 8, 9, 10) for the photographic material treatment, there are provided a first and a second autonomous and independent adaptation units (12, 15), which can be interposed removably among these operative units so as to compensate the different photographic material advancement speeds between the one and the other unit, by controlling suitably the photographic material advancement devices of each adaptation unit and the operative units adjacent thereto. Advantages of the invention system include that the dangers of damagings and/or breakages of the photographic material are avoided during the advancement thereof among the various plant operating units and adaptation units, while promoting a rational and reliable arrangement and operation of the same plant.