US 4,187,968 AGranted

Apparatus for threading a paper web into the folding mechanism of a rotary printing press

AssigneeMaschinenfabrik Augsburg-Nurnberg Aktiengesellschaft (M.A.N.)

InventorsJohann Winterholler, Josef Plantsch, Herbert Stockl, Siegfried Gunther

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Abstract

To provide for automatic threading of a paper web throughout an entire printing press equipped with a press threading mechanism, and also over the folding former thereof, two paper guide baffles are located at the back side of the folding former extending in converging direction from the edges of the former to the tip thereof and up to the nip between a pair of take-up rollers located below, and adjacent the tip of the former. Air pressure differential generating means, typically air blast nozzles are directed towards the guide baffles to generate an under pressure adjacent to surfaces thereof which will pull paper downwardly into the nip between the take-up rollers. The take-up rollers themselves have a knurled, or ribbed surface and are driven by air blasts directed against the ribbing of the surface, to move paper which is guided over the folding former by the air blasts away and through the former mechanism. Thus, threading of the press can be done entirely automatically, eliminating the requirement of a pressman, threading the paper web over the former.

Claims11

Dependent claims

Apparatus to thread a paper web into the folding mechanism of a rotary printing press having

a folding former (5,65);
driven supply rollers (23,25) upstream of the folding former to supply a web of paper (1) thereto;
two take up rollers (27) downstream of the folding former and having their axes located at right angles to the supply rollers (23,25), and forming a nip (75) there between;
and comprising, in accordance with the invention
two paper guide baffles (69,71) located at the back side of the folding former (5,65) extending in converging direction from the edges of the former to the tip (67) of the former and up to the nip (75) between the take-up rollers (27);
air pressure differential generating means (77,79, 81,83) generating an under pressure adjacent to the surfaces of the guide baffles (69,71) of sufficient intensity to pull the paper web (1) over the edges (63,73) of the former and into the nip (75) between the take-up rollers (27);
and means (29,99) acting on the take-up rollers providing rotational force thereto to provide for driving force by said take-up roller on the paper web (1) introduced in the nip between said rollers upon threading of the web over the former.

4 more elements

Dependencies are inferred from the claim text.