Coating apparatus – Projection or spray type – With projector heating – cleaning or conditioning
Patent
1990-04-11
1991-09-17
Wityshyn, Michael
Coating apparatus
Projection or spray type
With projector heating, cleaning or conditioning
118325, 222148, 239112, 239119, 239413, 239434, 239585, B05B 1502, B05C 502
Patent
active
050484540
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a device for application of a glue strip on a movable paper web by means of at least one glue sprayer for glue under pressure.
BACKGROUND OF THE INVENTION
Multi page prints produced in a printing press are nowadays glued in ever increasing extent instead of being stitched. Such prints, such as newspapers, magazines, brochures etc. are back or joint glued intermittently or continuously in the transport direction of the printing path. Gluing of the print directly in the printing press provides a number of advantages, i.e. lower production costs, higher flexibility concerning odd dimensions and number of sides, better final products (no loose pages), and a facilitated recovery of the paper, as there are no staples, which first would have to be removed.
Joint glueing machines are known per se, but they do not fullfil the requirements from highly efficient rotary printing machines.
PURPOSE AND MOST ESSENTIAL FEATURES OF THE INVENTION
The purpose of the present invention is to provide an intermittent gluing device wherein the length, width and location of the glue strip along the dividing line of the print shall be variable quite arbitrarily in accordance with the wishes of the user, and in dependence of which product shall be produced in the the printing machine. The plant shall be fully automated, which means that it starts and stops in accordance with a predetermined program, that it emits distinct strips of glue without any late dripping and that the jet nozzles are automatically rinsed after commenced printing. The plant shall be easy to handle, no specialist knowledge shall be required for changing programmable functions. Putting in service and maintenance shall be possible to effect automatically or with a minimum of work by the user. The installation shall be easy to make and no influence upon the other functions of the printing machine are allowed. The plant furthermore shall be compatible with all printing presses available on the market.
These tasks have been solved in that the device incorporates a valve housing for two diaphragm-magnetic valves or the like, the spring loaded rubber diaphragms of which are provided between one inlet chamber and one outlet channel each, intended for glue and for a rinsing liquid resp., that the outlet channels are interconnected and adapted to open into a common nozzle with a fine outlet opening located at some distance from the paper track, and that the piston of each magnetic valve acting upon the rubber diaphragm has a very short stroke.
DESCRIPTION OF THE DRAWINGS
The invention hereinafter will be further described in an embodiment with reference to the accompanying drawings.
FIG. 1 shows a section through a glue sprayer according to the invention in exaggerated size.
FIG. 2 shows the glue sprayer according to FIG. 1 in a view from below, i.e. the side where the nozzle is provided.
FIG. 3 shows a schematic overall view of how a plurality of glue sprayers according to the invention may be arranged.
DESCRIPTION OF THE EMBODIMENTS
The glue spraying device according to the invention, designated 11, incorporates a valve housing 12 in which is provided two diaphragm valves 13 and 14, each of which is actuated by one electromagnet 15 and 16 resp. Each valve 13, 14 incorporates an inlet channel 17, 18 for one medium each, one annular inlet chamber 19, 20 and one outlet channel 21 and 22 each. The inlet channel 17 of the valve 13 is intended to be connected to a glue tank, which is not further shown, whereas the inlet channel 18 of the valve 14 is intended to be connected to a tank (not shown) containing rinsing liquid. These two media, i.e. the glue and the rinsing liquid are under pressure so that each medium, in its associated inlet chamber 19 and 20 resp. is under a pressure of e.g. 6 bar. A rubber diaphragm 23 prevents the glue from reaching the outlet channel 21 and a second rubber diaphragm 24 prevents the rinsing liquid from reaching the outlet channel 22. Both diaphragms are spring loaded by a spring 25 and 26 resp. and
REFERENCES:
patent: 3481542 (1969-12-01), Huber
patent: 3770209 (1973-11-01), Wilcox
patent: 3850371 (1974-11-01), Trapp
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