Photocopying – Contact printing – Light boxes
Patent
1986-11-14
1987-11-24
Mathews, A. A.
Photocopying
Contact printing
Light boxes
354325, 355 10, 15 77, 118684, 118641, G03D 504
Patent
active
047084529
ABSTRACT:
The decoating device 21 comprises a spraying section 22, a heating zone 9, a cleaning station 23 and a gumming station 24. Containers 5a, 5b, 5c for various developing liquids are connected via a multiway valve 5 to one or more flat-jet nozzles 6 in the spraying section 22. A first sensor 4 registers the incoming printing plate 1 and actuates the multiway valve 5 in order to admit decoating liquid from one of connected containers 5a, 5b or 5c to the flat-jet nozzle(s) 6. The decoating liquid sprayed past the printing plate 1 is conveyed via a collecting trough 7 into a collecting container 8. The thin film of decoating liquid on the printing plate 1 is heated to the preselected temperature by means of the radiator 25 in the heating zone 9. A pair of squeezing rollers 11 cleans the printing plate surface. A second sensor 14 registers the front edge of the printing plate 1 and then switches on the cleaning station 23 and gumming station 24 known per se. The rear edge of the printing plate 1 switches the decoating device 21 off via the second sensor 14. Shortly before the switching off, the flat-jet nozzles 6 are rinsed via a water connection 20 and the multiway valve 5 in order to prevent a clogging of the nozzle orifices.
REFERENCES:
patent: 3621772 (1971-11-01), Bogue
patent: 4068251 (1978-01-01), Schroter et al.
patent: 4081577 (1978-03-01), Horner
patent: 4128326 (1978-12-01), Selak
patent: 4334755 (1982-06-01), Harrell et al.
patent: 4573782 (1986-03-01), Kobayashi et al.
patent: 4627698 (1986-12-01), Yamasaki et al.
Hoechst Aktiengesellschaft
Mathews A. A.
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