摘要 |
A machine for slitting plane packaging blanks ( 3 ) made of corrugated board. The machine includes a driving roller assembly ( 1' a, 1' b, 5', 5'' ) for advancing the blanks and a rotatable slitting roller ( 7 ) with a knife ( 9 ) for producing a front edge slit ( 11 ) and/or a rear edge slit ( 13 ) in each packaging blank ( 3 ). The knife ( 9 ) is circular and defined by two knife edges ( 9 a, 9 b), said knife extending across a central angle (v) of max. 300° in such a manner that said knife presents a knife gap ( 19 ) between said knife edges. By means of the slitting roller ( 7 ) and an associated driving motor ( 21 ) controlled by a programme timer ( 23 ), a portion ( 9 A) of the knife ( 9 ) adjacent the first knife edge ( 9 a) is adapted to cut the front edge slit ( 11 ) out of the front edge ( 15 ) of the blank and into said blank ( 3 ), whereas a second portion ( 9 B) of said knife adjacent the second knife edge ( 9 b) is adapted to cut the rear edge slit ( 13 ) out of a location on the blank ( 3 ) adjacent the rear edge ( 17 ) of said blank and rearwards through said rear edge by means of said slitting roller ( 7 ), said driving motor ( 21 ) and said programme timer ( 23 ) while said blank ( 3 ) is advanced through the machine at a uniform speed. The resulting operational reliability is very high even at a high working speed, and the resulting slits present sharply cut edges The machine is furthermore relatively inexpensive to manufacture.
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