Printing – Rolling contact machines – Rotary
Patent
1996-08-16
1997-12-16
Eickholt, Eugene H.
Printing
Rolling contact machines
Rotary
101211, 101247, 101248, B41F 504
Patent
active
056972970
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a printing apparatus comprising at least one printing module.
Printing houses producing printed matter, such as labels, booklets, etc., experience tough competition in the market place. The market demands more and more special effects of printed matters, such as high resolution graphics, a great variety of colours, strong colours, thick layers of colours, hot foil application, punching, etc. Therefore, the printing houses need to be able to apply many different technologies during production of printed matter and they need to be able to apply these technologies in different sequences for different printed matters.
Printing apparatuses of a modular concept wherein a printing module comprises all the means necessary to utilize a specific technology for processing a web are known. A printing apparatus is made by mounting selected printing modules in a desired sequence in a row adjacent to each other. For example a label printing machine could comprise two serigraphy modules followed by two letterpress modules, a hot foil application module, another letterpress module, two flexographic modules, and finally a punching module. A printing apparatus manufactured this way is called an in line printing apparatus. This modular concept enables the manufacturer of printing apparatuses to customize his end product to fit the production process desired by his customer.
However, once the printing apparatus has been composed with the printing modules arranged in a specific sequence this sequence can not be changed without reengineering the apparatus. As different kinds of printed matter often require that the different technologies available to the printing house is applied in different order during production of different printed matters, the printing house has to move intermediate products between different production machinery during production.
It is well known to provide the flexibility needed within each printing module so as to be able to produce different formats of printed matter having different lengths or dimensions in the longitudinal direction of the web.
Conventionally, the problem is solved by exchanging the printing cylinders or punching cylinders so that the printing and/or punching cylinder used has a peripheral length corresponding to the length or longitudinal dimension of the format to be printed. For example from WO 87/04665 it is known to mount the plate cylinder and the blanket cylinder of an offset printing machine in a cartridge which is arranged on one side of the web and which may be withdrawn axially thereby facilitating the exchange or cleaning of the plate and blanket cylinders.
SUMMARY OF THE INVENTION
The present invention provides an improved printing apparatus of the above type.
Thus, the present invention provides a printing apparatus comprising at least one printing module each of which comprises a main frame with an impression cylinder, guide rollers for guiding the web along a web path, and receiving means for detachably receiving a cassette containing means for processing the web and means for cooperating with the impression cylinder, the cassette being positioned exclusively at one side of the web path so that the cassette may be mounted in or removed from said printing module without breaking or removing the web.
The present invention also provides a printing apparatus, wherein the printing module further comprises an ink roller system, and/or a moisture roller system, or a combined ink and moisture roller system, and means for selectively moving the ink roller and/or the moisture roller systems or the combined ink and moisture roller system between their inoperative position and their operative position in which ink and moisturizing liquid, respectively, is supplied into the cassette. Further the printing module may comprise feed rollers for feeding the web.
The printing apparatus according to the invention has an increased flexibility compared to known printing apparatus as a printing house will be able to produce p
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Eickholt Eugene H.
nilpeter a/s
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