Device for drawing a web into a webfed machine

Details Device for drawing a web into a webfed machine Device for drawing a web into a webfed machine

1987-01-27

1988-06-14

Levy, Stuart S.

Advancing material of indeterminate length

Threading device

With means to pull lead-end

101228, B41F 1302, G03B 156

Patent

active

047506598

ABSTRACT:
The invention is concerned with improvements in a web draw-in system for a web printing press comprising printing units with register rolls around which the web is trained, a draw-in bar to be attached to the leading end of the web and two tractive elements extending along the side frames of the press and guided by bend pulleys following the web path in the press. The tractive elements extend from one drum at one end of the press to a further drum at the other end so that they may be wound onto and unwound from such drums moving the draw-in bar along the web path. In order to ensure a low degree of strain on the tractive elements, and for this reason a substantial removal of stress from the servo means moving the register rolls the drums are each driven synchronously in either direction of rotation by a main drive connected with them via respective differentials, more especially in the form of harmonic drives or other epicyclic systems whose further input shaft is connected with an ancillary drive means which is controlled by a monitoring device sensing the tension in at least one of the tractive elements. The ancillary drive device may thus be turned in either direction. Near a position halfway along the web path there is a locking device for locking the tractive elements except when the web is being drawn in or the tractive elements are being rewound. The monitoring device are operative when the tractive elements are so locked.

REFERENCES:
patent: 4111122 (1978-09-01), Kutzner et al.
patent: 4404907 (1983-09-01), Kobler et al.
patent: 4480801 (1984-11-01), Stone

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