| 摘要 |
Trays are erected from cardboard blanks by insertion of bent edge parts into slits in tongues, the extent of insertion dictating the carrying capacity of the resulting tray. The edge parts are bent with a double fold using mechanical fingers to give a wedge-shaped insertion structure for engagement with the slits in the tongues. To stiffen the blank and simplify insertion, side walls of the blank are first bent up by a bending tool and then subsequently insertion fingers are pivoted against the edge parts to form the double fold, and insert it into the slits of the tongues. |
