CONTINUOUS FORM AND APPARATUS FOR FORMING LETTER SHEETS THEREFROM
European Patent Office Patent
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Abstract
A paper web comprises separable edge feed portions surrounding a continuous form. The continuous form has regularly longitudinal spaced opposed paires of transvers cut lines (26, 28) extending from each web edge portion (20, 22). The pairs of transverse lines leave an uncut middle portion (30) of the web (10) and furthermore the lines extending from each marginal web portion (38, 40) are of uniform length. A perforation or score line (32, 34) runs longitudinally along the inner end of the transverse lines extending from each marginal portion (38, 40). This web construction permits the continuous form portion (24) of the web (10) to be folded in the direction of motion of the web (10) over the shortest known distance prior to cutting or separating the web (10) at the opposed pairs of lines to form folded sheets. In another embodiment, the transverse cut lines (26, 28) may be replaced by transverse perforation lines (226, 228) in which case the web is burst at these lines prior to folding. A machine (50) for forming letter shets from the paper web has a tractor feed (52), a slitter (54) for removing the pin hole (25) edges of the web (10), an in-line Z-folder (56), pinch rollers and a burster. The Z-folder (56) has a length which is one and half to two times the spacing between transverse perforation lines. The speed of the tractor feed drive (52) and pinch roller drive (58) are monitored and a sensor (76) senses each transverse cut (26, 28) so that the speed of the pinch rollers (58) may be synchronised with the tractor feed (52).
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Cited Art Landscape
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