Coating apparatus – Solid member or material acting on coating after application – Rotary member
Reexamination Certificate
2003-01-31
2004-06-22
Edwards, Laura (Department: 1734)
Coating apparatus
Solid member or material acting on coating after application
Rotary member
C118S118000, C118S123000, C118S261000, C118S262000, C118S413000, C118S414000, C118S117000
Reexamination Certificate
active
06752871
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a coating system for coating print carriers, the coating system having at least one pump, at least one selection valve, a first metering device and a second metering device. The invention also relates to a coating machine having the coating system.
Such coating systems serve, for example, for coating print carriers with zinc white primers, metallic printing inks or clear varnish coats.
German Utility Model DE 296 16 686 U1 illustrates a coating system (note
FIG. 4
therein) corresponding to the general type mentioned in the introduction hereto wherein, according to the description that is given, depending upon the printing order, one of the metering devices can be exchanged. The aforementioned utility model illustrates a further coating system (note
FIG. 1
therein) which includes only a single metering device and therefore does not actually correspond to the general type of coating systems mentioned in the introduction hereto. This metering device may be constructed in accordance with the anilox metering principle, the scoop-roller metering principle or the nip-roller metering principle.
The specialized journal “Deutscher Drucker” [German Printer], number 34 of Sep. 13, 2001, page 26, describes a new product line of the company Harris and Bruno Europe GmbH for fully automatic in-line cleaning, wherein, according to the description given, it is not necessary to change hose systems or pumps, and a chambered doctor blade can remain in position.
Furthermore, the German Utility Model DE 299 13 778 U1 describes a coating system which includes a metering device and a circulation line system. The metering device includes a screen or engraved roller and is therefore constructed in accordance with the anilox metering principle. The circulation line system is made up of a supply line, a return line and pumps. The supply line and the return line are couplable with the metering device. In this last-mentioned utility model, it is noted as advantageous that the circulation line system manages without switching valves and would consequently be uncomplicated.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a coating system for coating print carriers and a coating machine having the system, which overcome the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a coating system for coating print carriers. The system comprises at least one pump, at least one selection valve, a first metering device and a second metering device. The first metering device and the second metering device are constructed differently from one another with respect to metering principles thereof. The at least one pump and the at least one selection valve are assembled or combined into a modular supply unit constructed so as to be compatible both with the first and with the second metering device.
In accordance with another feature of the invention, the first metering device includes, in accordance with the pan-roller metering principle, a storage trough and a dip or pan roller.
In accordance with a further feature of the invention, the second metering device includes, in accordance with the anilox metering principle, a doctor blade and a screen roller.
In accordance with an added feature of the invention, the coating system further includes connecting lines for connecting the supply unit to the first metering device.
In accordance with an additional feature of the invention, the first metering device and the second metering device have respective connections. One of the connecting lines is connected to the connection of the first metering device and is constructed for fitting together with the connection of the second metering device and is thereby connectable to the connection of the second metering device.
In accordance with yet another feature of the invention, the connecting lines are coupled via couplings with further connecting lines which are connected to the supply unit.
In accordance with yet a further feature of the invention, the coating system further includes a coating machine provided with the first metering device. The coating machine has a machine frame or stand, and the couplings are disposed locally fixed on the machine stand.
In accordance with yet an added feature of the invention, the supply unit has a frame or stand whereto the pump and a selection valve are fastened.
In accordance with yet an additional feature of the invention, the frame or stand is a closed housing within which the pump and the selection valve are disposed.
In accordance with still another feature of the invention, the coating system further includes a coating-liquid reservoir assigned to the supply unit. The reservoir is disposed outside the housing.
With the objects of the invention in view, there is also provided a coating machine, comprising a coating system for coating print carriers. The system includes at least one pump, at least one selection valve, a first metering device and a second metering device. The first metering device and the second metering device are constructed differently from one another with respect to metering principles thereof. The at least one pump and the at least one selection valve are assembled into a modular supply unit constructed so as to be compatible both with the first and with the second metering device.
In accordance with a further feature of the invention, the coating machine is a printing machine.
In accordance with a concomitant feature of the invention, the coating machine is a varnishing machine.
Thus, the coating system according to the invention has a first metering device and a second metering device which are constructed differently from one another in terms of metering principles thereof. The pump and the selection valve are assembled or combined for forming a modular supply unit or assembly. The supply unit is constructed so as to be compatible both with the first and with the second metering device.
One advantage resulting from the difference between the metering devices is that different coating liquids can be printed by the coating system. For example, a high-viscosity coating liquid can be metered and printed with the aid of the first metering device, and a low-viscosity coating liquid can be metered and printed with the aid of the second metering device.
Advantages resulting from the pump being assembled or combined with the selection valve into a structural unit in the form of the supply unit or assembly are the compact form of construction and therefore the low space requirement of this supply unit. The supply unit may be integrated, for example, into a cabinet or shelf next to a printing or varnishing machine including the metering devices.
An advantage which is to be particularly emphasized is that the supply unit is constructed so as to be selectively couplable with the first and with the second metering device. To execute a printing order, the supply unit, in the state wherein it is coupled to the first metering device, can be operated together with the latter, while the second metering device is not required for executing the printing order and is uncoupled or decoupled from the supply unit. To execute another printing order for which the second metering device is required, but not the first metering device, the second metering device can be coupled, instead of the first metering device, to the supply unit, so that the supply unit and the second metering device can be operated jointly.
The coating system according to the invention may be associated with only a single coating machine, for example a printing machine. For example, the metering devices may be constructed as interchangeable devices which can be inserted selectively, in exchange for one another, into a varnishing unit of the printing machine. In this case, the metering device inserted, respectively, into the varnishing unit is connected to the supply u
Bitterich Wolfgang
Heller Bernd
Edwards Laura
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Locher Ralph E.
Stemer Werner H.
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