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US 4,083,745 AGranted
Apparatus for promoting the setting of adhesive on stacks of sheets in bookbinding machines
AssigneeGrapha-Holding AG
InventorHans Muller
Life of this patent
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AssigneeGrapha-Holding AG
InventorHans Muller
Estimating the term…
A bookbinding machine wherein stacks of signatures are transported by the holders of an endless conveyor which moves the stacks seriatim along a paster. The paster coats the backs of successive stacks with wet adhesive and the stacks are thereupon transported through a heating zone where the adhesive is heated in the space between two elongated electrodes of a high-frequency heater. A pipe which extends along the path of stacks in the region of one of the electrodes has orifices which discharge streamlets of preheated air across the path of holders to impinge against successive stacks and to thus prevent scorching of signatures by heat which is generated by the high-frequency heater. The rate of flow of air through the orifices of the pipe is adjustable, and such rate preferably increases in the direction of forward movement of the holders.
In a machine for processing stacks which consist of sheets and selected portions of which are coated with a thermosetting adhesive, such as wet glue, particularly in a bookbinding machine, a combination comprising a conveyor including a plurality of holders each arranged to support a stack and to transport the respective stack in a predetermined direction along a predetermined path;
In a machine for processing stacks which consist of sheets and selected portions of which are coated with a thermosetting adhesive, such as wet glue, particularly in a bookbinding machine, a combination comprising a conveyor including a plurality of holders each arranged to support a stack and to transport the respective stack in a predetermined direction along a predetermined path;
Dependencies are inferred from the claim text.