FIELD: jet printing equipment, in particular, devices for production of copies with the aid of jet printers and systems. SUBSTANCE: for a jet printer the hydraulic and electronic delineation of the construction members is determined anew. Modular separation of the printing apparatus from the writing apparatus provides for realization of the replaced printing module containing all the principal members of the jet printing system, in particular for those, which have the highest probability of wear or failure with time due to the often use. The subsystem of the printing apparatus contains one or several printing modules, having the elements of the printing head with the respective components of the printing ink line and the mechanisms of control of consumption and pressure of the printing ink. Besides, it has one or several printing ink vessels either permanent, replenished or replaced with one or several compositions of the printing ink, one or several means of printing ink supply, such as pipes and valves, hydraulic printing ink connecting vessels with the printing ink lines, components of the servicing section. The printer subsystem has a frame for arrangement of the mentioned components in a combined module, which is inserted as a cassette. This provides for production of the modules of the jet printer for use with a compactable module of the printing apparatus, printing apparatus on their base, their manufacture, service and use. Besides, it provides for production of a printing apparatus compactable with the described printing apparatus. The printing apparatus does not contain any components for which a direct contact with the printing ink is required. The components wettable with printing ink are made for taking into account the technical modifications irrespective of the electric and mechanical connection between the writing apparatus and the printing apparatus. EFFECT: improved constructions. 19 cl, 21 dwg
