Device for the electrostatic perforation of webs of paper

Details Device for the electrostatic perforation of webs of paper Device for the electrostatic perforation of webs of paper

B - Operations, Transporting

26

F

131/22

B26F 1/28 (2006.01)

Patent

CA 1201033

- 2 - ABSTRACT OF THE DISCLOSURE This invention relates to a device for the electrostatic perforation of webs made of paper or other materials, particularly of the webs used in the manufacture of ventilated cigarettes to constitute the cigarette envelope or the junction band of G cigarette with the respective filter. the device comprises two opposite electrode-carrying heads being traversed therebetween by a web to be perforated, one of which is provided with a plurality of individual needle-shaped electrodes arranged substantially perpendicularly to the plane of the web and cooperating each either with a corresponding individual and co-axially opposite needle-shaped electrode provided on the other head or with a common plate-shaped electrode provided on said other head. This perforating device is characterized in that the individual needle-shaped electrodes are mounted so as to be axially slidable in the respective electrode-carrying head and can be pushed toward the opposite electrode- carrying head by a pushing force and against the action of an opposing force, until their front ends will engage a gauged shim placed between the two electrooe-carrying heads and adapted to establish the right spacing between the electrodes of the two electrode-carrying heads . In addition to this periodical re-setting of the right spacing or distance between the electrodes, the invention also provides an automatic approaching of the electrode-carrying heads during the operation of the perforating device, through a micrometric, relative, either continuous or discountinuous movement, as a function of the progressive increase of the distance between the electrodes and intended to compensate for the wear of said electrodes, until a pre-established minimum distance between the electrode-carrying heads is reached.

436041

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