| 摘要 |
1,172,448. Making cardboard boxes. FIT CONTAINER A.G. 18 July, 1967 [20 July, 1966; 27 April, 1967], No. 32950/67. Heading B5D. [Also in Division B8] A method of erecting a flat blank to an open tray form having two pairs of opposite side walls, a pair of flaps 24, 25 at each end of one pair of side walls and bent at right-angles thereto and into the plane of one of the other side walls, and a marginal strip 12, 13 on each of said other side walls bent inwardly to overlap said flaps, comprises moving the blank into the path of a plunger, coating said marginal strips with adhesive during movement of the blank, pressing the blank into a folding die to erect it, and bending the marginal strips outwardly mechanically by means of bending elements projecting laterally over said plunger, retracting the plunger from the die and mechanically folding over and gluing the marginal strips to the inwardly bent flaps by means of pivotally mounted members. The leading blank from a magazine 36 is removed by a suction cup feed member 37 to a position where it can be gripped by cam operated gripping jaws 57 and moved past adhesive applying nozzles 63 fed from adhesive containers 60, 61 to a position between a plunger 59 and folding die 35. During initial movement of the plunger and blank into the die, the adhesive coated side walls 8, 9 and marginal strips 12, 13, are held back by deflecting members 87, Fig. 9. During continued movement of the plunger the deflecting members are halted by stops 89, 92, allowing the side walls 8, 9 to be completely erected, and the marginal strips are bent outwardly by deflectors 93 mounted on the plunger 59, Fig. 10. In a modification, Fig. 14 (not shown), the deflectors (193) are of triangular form and press the marginal strips 12, 13 against gripping needles on the shafts of the pivoted arms 100. Return movement of the plunger may then be effected without contacting the adhesive on the marginal strips, whereafter arms 100 are rotated through sprocket gearing to fold the glued marginal strips into the interior of the box, Fig. 11. On each side of the blank magazine there are mounted prefolding members (143), Fig. 19 (not shown), which first overfold the marginal strips about bars (144) so as to assist their subsequent inward folding by the arms 100. The outlet of each nozzle 63, Fig. 12 (not shown), is controlled by an apertured diaphragm (64) carried by a member (65) pivoted at (66) and cam-operated in the desired sequence. |
