Printing – Stenciling – Rotary machines
Patent
1998-12-17
2000-03-28
Yan, Ren
Printing
Stenciling
Rotary machines
101183, B41L 1304
Patent
active
060417056
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to a rotary silk screen printing machine which comprises two main rollers mounted in spaced manner, one is driven by a main drive motor, a continuous conveyor belt fixed between the main rollers and a plurality of printing mechanisms succeeding one another over the course of the conveyor belt and which in each case have a printing cylinder and a printing cylinder drive associated therewith.
BACKGROUND OF THE INVENTION
Rotary silk screen printing machines of this type are e.g. known from EP 396 924 B1 or EP 522 640 A1.
Drive technology for rotary silk screen printing machines, has envolved over the last five to ten years, to include the use of individual motors for positioning and driving the individual printing cylinders and associated therewith the increasing use of electronic drive components. In the early stages of this development machines of this type equipped with stepping motors individually associated with the printing mechanisms (cf. EP 396 924 B1) were only developed as top of the line products in addition to the known, so-called geared machines and were gradually provided with additional different electronic functions, in order to take account of the general trend towards automation. This new, individual drive technology developed rapidly to form the general standard, so that presently purely mechanical machines have almost disappeared from the market. Also printing machines with a low degree of automation nowadays have in a virtually obvious manner this technology developed as "single drive technology". This is technically implemented by the use of stepping motors or servomotors, equipped with the necessary electronic control or setting for ensuring an adequate synchronous running and a corresponding degree of automation, also through the incorporation of additional actuators, sensors and operating means, together with service and control elements for each individual printing cylinder, which must be electrically connected by means or a large number of cable connections with the generally separately set up control means often several metres away. Even though the comprehensive equipping of each printing station nowadays simplifies and facilitates the production of material to be printed, there are still numerous practical difficulties and disadvantages.
As printing systems of the aforementioned type must generally be equipped with more than ten printing stations, the manufacture, fin situ installation and in particular the subsequent maintenance prove very costly and difficult, so that only specially trained experts are able to study, handle and maintain such systems. Such high capital costs for the operator of such systems must be added additional extra expenditure for installation, commissioning and continuous servicing by expensive specialists. This clearly runs counter to the requirement for highly productive capital products resulting from competition and high costs, which permit the production with low running costs, maximum quality standards and minimum maintenance-caused production shutdowns.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a rotary silk screen printing machine which, in the case of low capital expenditure, is rapidly and easily adaptable to modified production requirements and which permits a high degree of machine usage.
In the case of a rotary silk screen printing machine of the aforementioned type, this object is achieved in that the printing mechanisms are implemented by modular single subassemblies with in, each case associated control modules individually programmable to different printing programs, each case is connectable to a data bus of the printing machine in digital network interconnection for the interchange of operating parameters between the control module on the one hand and the conveyor belt drive unit or units on the other, while the control modules are interconnectable and/or connectable to a command station.
Thus, the invention is based on the idea of modularizing
REFERENCES:
patent: 3898156 (1975-08-01), Zimmer
patent: 4063501 (1977-12-01), Lotte
patent: 4366542 (1982-12-01), Anselrode
patent: 5255598 (1993-10-01), van Sas et al.
patent: 5400709 (1995-03-01), Drilling et al.
patent: 5664101 (1997-09-01), Picache
Safran David S.
Studebaker Donald R.
Yan Ren
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