Coating apparatus – Solid applicator contacting work – Movably mounted applicator
Patent
1995-12-04
1997-12-02
Edwards, Laura
Coating apparatus
Solid applicator contacting work
Movably mounted applicator
118110, 118203, 118244, 118258, 156578, 156908, 412 37, B05C 100
Patent
active
056931425
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to a wheel applicator device for the mechanized application of an adhesive to workpieces, especially to the spines of books during the process of bookbinding, with a glue tank open at the top; a driven applicator wheel capable of rotating around a horizontal axis; the lower part of the applicator wheel being immersed in the glue tank filled with adhesive; the top apex line of the upper peripheral surface of the applicator wheel being situated on a plane in which the book spines to be glued are being pushed forward at adjustable speed by the conveyors and guides of a bookbinding machine, so that the adhesive which was picked up in the lower part of the glue tank and which is adhering to the periphery of the applicator wheel is transferred to the book spines; the peripheral velocity of the applicator wheel being coordinated with the transport speed of the book blocks, the direction of the wheel's rotation in the upper area corresponding to the feed direction of the book blocks.
Wheel applicators of this type are known and are used to apply liquids, especially adhesives, in the processing of, for example, leather, paper, wood, and other natural and synthetic materials and in bookbinding.
In bookbinding by spreading glue on the spines of the books and then attaching the covers, it is known that wheel applicator devices can be connected to bookbinding machines. According to the state of the art, this coupling is implemented in such a way that the wheel applicator is flanged by its housing or frame to the bookbinding machine by means of appropriate fastening means, such as screw joints. To drive the applicator wheel of the wheel applicator device at a speed such that the peripheral velocity of the applicator wheel matches the feed or transport speed of the book blocks to be bound, the applicator wheel in the known devices is coupled by way of a gear wheel to the bookbinding machine. For this purpose, either a shaft coupling or the gear wheel is installed inside the flange connection. In this way, the applicator wheel is driven at the correct rotational speed.
A coupling of this type between a wheel applicator device and a bookbinding machine suffers from the several disadvantages. It takes a great deal of mechanical work to assemble and disassemble the flange joint between the bookbinding machine and the wheel applicator, and the necessary fastening means must be provided on both devices. When a wheel applicator is to be used alternately on different bookbinding machines, either the dimensions of the flange connection must be identical, or custom-made adapters must be available for the various attachments. The flange joint must also be fabricated with special precision to ensure trouble-free, low-loss transmission of the mechanical power required to drive the wheel applicator, this power being transmitted by means of gear wheels, which must themselves be precisely aligned. This precision fabrication is required to ensure that the applicator wheel is positioned accurately vis-Avis the book spines to be glued.
When polyurethane is used in wheel applicators to glue the spines of the books, the sensitivity of polyurethane to moisture leads relatively quickly to the decomposition of the polyurethane being held ready in the glue tank. As a result, it is frequently necessary to clean the glue tank so that the properties of the adhesive can be guaranteed. Doctor blades are used on the applicator wheel to wipe off excess adhesive and to help form a uniform layer of adhesive on the wheel.
The present invention is based on the task of providing a wheel applicator which eliminates almost all of the disadvantages of the state of the art, can be used in an especially simple manner in conjunction with various bookbinding machines, and which, especially when use is being made of polyurethane as adhesive, gives favorable results with respect to the application of the adhesive.
According to the invention, the task is accomplished in that a wheel applicator of the type indicated
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Nixon Andrew
Pedigrew Colin
Edwards Laura
Nordson Corporation
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