Printing – Antismut device – Drying with fluid or by heating
Patent
1992-11-10
1995-01-24
Burr, Edgar S.
Printing
Antismut device
Drying with fluid or by heating
101487, B41F 3500
Patent
active
053834038
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to improvements in or relating to a sheet offset press, and more specifically to an arrangement of an infra-red (IR) drier for such presses having a low sheet discharge conveyor provided with an IR battery, ready printed sheets being passed under this battery for drying the ink fields on the sheets, and the battery being situated under, or close to the ink rolls in the last stand of the press.
2. Description of the Related Art
In previously known machines of the type mentioned above, spray powder has been used in drying the printed sheets before stacking the individual sheets. With this procedure the sheets can be stacked before they are properly dry. A disadvantage is, however, that large space is required in the press hall for these stacks of sheets that are put out to dry off, and the drying time may amount to several hours. In addition, large quantities of spray powder are consumed in preventing the individual sheets from sticking to each other in the stacks. Attempts have of course been made to use IR lamps for drying the ink on the sheets inside an offset press of the kind in question, but there has been a problem with the heat generated by an IR drier for providing a good driving effect in the process because drying of the moisture on the platens in the press also occurs. This is due to the ink rolls in the last stand generally being placed above or close to the stack of sheets, where the IR drier must also be placed.
SUMMARY OF THE INVENTION
One object of the present invention is to provide an arrangement with an IR drier of the kind mentioned in the introduction, where the disadvantages mentioned have been eliminated. This object is achieved with an arrangement described above, and with the characterizing features disclosed in the claims.
According to the present invention there has now been achieved an arrangement which meets its purpose in an excellent way, while being cheap and simple to manufacture at the same time. Apart from an effective cooling of the IR battery, the connections to the IR lamps, the lamps themselves as well as their electric cables are also cooled. Since the IR battery is cooled using a "closed" air cooling system, any leakage of air is avoided, and simultaneously cooling will be very effective. With the aid of the exhaust station there is obtained a sufficient air stream/change of air round the IR drier inside the press, the air to the exhaust station coming from the press hall via a grid at the ink rolls adjacent the stack of sheets and through other openings, thus providing the ventilation required for preventing the heat occurring in the drying process from migrating up through the press, which would cause the above-mentioned problems. The combination of IR battery and exhaust station provides a sufficiently "cold" printing press, so that setoff against the platens is avoided.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described in more detail below, and with reference to the accompanying drawing, which illustrates a schematic cross section of the arrangement of an IR battery for a sheet offset press with a low sheet discharge conveyor in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In the drawing there is shown a preferred embodiment of an IR drier 2 in accordance with the present invention in a sheet offset press 1 with a low sheet discharge conveyor 13. The drier 2 includes an IR battery 3, known per se, in combination with an air cooling system. The ink rolls 5 of the last stand 6 in a printing unit 14 of the press 1 are arranged, as will be seen from the drawing, above or adjacent a stack 11 of sheets 4, close to where the IR battery 3 must be placed. An air cooling system is connected to the battery 3, a supply air fan 7 blows air into one end 8 of the battery 3, such as to emerge from its other end 9 for removal by an exhaust fan 10. This air also cools the terminals of the IR lamps, the lamps themselves as well
REFERENCES:
patent: 1414872 (1922-05-01), Frederick
patent: 3934112 (1976-01-01), Lakhani
patent: 4449453 (1984-05-01), Staffer et al.
patent: 4809608 (1989-03-01), Wolnick et al.
patent: 5060572 (1991-10-01), Waizmann
Burr Edgar S.
IVT Graphics AB
Nguyen Anthony H.
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