| 摘要 |
1,084,387. Seaming non-metallic sheet material; making boxes. AKERLUND & RAUSING A.B. Oct. 4, 1965 [Oct. 14, 1964], No. 41974/65. Headings B5D and B5K. Heat and/or press sealable material 7, e.g. carton material provided with a thermoplastic coating, is jointed by bringing together edge portions of the material 7 with their edges substantially aligned, clamping the material 7 nearest to the desired location of the joint between supporting jaws 5, 11, 12, and pressing the edge portions inwardly against the remainder of the unclamped edge portons thereof by a pressing jaw 13 using the jaw 5 as an anvil, whereby the contiguous edge portions of the sheets are pleated to form a tight seal. The invention is applicable to forming the corner joints of a carton made from a blank (7), Fig. 4 (not shown), having four side panels (7b) connected to, and adapted to fold up from, all sides of a bottom panel (7a) to form a traylike container. Edge panels (7c) are hinged to the panels (7b) so as to be foldable to lie against the outside of the completed carton. Angular sealing panels (7d) are provided at the four corners. In a machine to effect the jointing, Figs. 1 and 2 (both not shown), four jaws (5) are carried by arms (4) on a turret (3) on a shaft (2). A blank (7) is fed from one of two magazines (6) to a position (7<SP>1</SP>) by a jaw (5) acting as a suction cup. The jaw (5) moves the blank (7) through an opening slightly larger than the panel (7a) so that the panels (7b) are folded upwardly by outer supporting jaws (9), (10), (11), (12) operable by hydraulic cylinders (14), (15), (16), (17) to clamp the panels (7b) against the jaw (5). Four pressing jaws (13) are moved inwardly by hydraulic cylinders (18) against the clamped corners to effect the joint, Fig. 5 (not shown), under simultaneous heating in case of heat-sealable material. The jaws 5, 13, Fig. 3, are formed with recesses 26, 25, respectively, to determine the shape of the joint. The jaws (9), (11), (13), Fig. 2, are mounted on transverse bars (19) threaded on vertical setting screws (20) lotated by a wheel via a rack and pinion transmission (22), (23), (24) or a chain transmission. The jaws (13) are adjustable laterally on the bars (19). The jaws (10), (12) are also adjustable laterally either by being provided with telescopic piston rods or by exchanging jaws and/or piston rods. In a modification, Fig. 6 (not shown), two sheets (28), (29) lying in the same plane are jointed by first folding the edge portions thereof through about 90 degrees. The jointing may be effected by a profiled wheel displaceable along the joint combined with a subsequent plane rolling wheel. |
