| 摘要 |
The device comprises at least one toothed roller supported by a rocking lever, and adapted to contact the outer edges of the side flaps of the blanks. Each toothed roller is mounted on a pin by a conventional free wheel device so as to exert a sliding friction on the outer edges of the flaps only during a downwardly directed movement thereof, thereby bending the flaps in a direction opposite to the one naturally assumed by them due to the composite conformation of the stack of blanks.
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