| 摘要 |
330,913. Ware, H. M. Feb. 11, 1929. Paper tubes.-A suitably shaped cardboard blank, located in a tray j, j<1> is formed into a tube for the production of a carton by feeding it to a conical &c. mandrel b, mounted on a pedestal a, and folding it therearound by a tool d consisting of a series of pairs of arcuate spring jaws d<3> adapted to engage with, and circumferentially conform to, the said mandrel. The tray is formed in two parts j, j<1> with the outer edge of the part j<1> further removed from the centre of the mandrel than the outer edge of the part j, so that the edge of the blank located in the part will overlap the edge located in the part f after operation of the folding tool d. The blank is gummed along the edge in the tray j<1> prior to application to the mandrel and is initially held against the same by a clamping bar c disposed below and centrally of the mandrel, while a joint-sealing pressure bar e, which may be heated, is disposed above the mandrel. The wrapping-tool d and pressure bar e are both connected to rams f, e<5> reciprocating within cylinders f<1>, e<1>, respectively, the rams being moved outwardly by fluid pressure controlled by valves g', e<4>, as shown, and returned by springs f<2>, e<8>. The valve g<1> is actuated by a foot-lever h, while movement of the valve e<4> is controlled by a trip f<3> on the tool d through the medium of pivoted rods e<6>, e<7> and valve rod e<9>. The tool d is also formed with a cam surface d<2> which operates a lever i to raise the clamping bar c. In operation, a blank is fed by hand to the tray j, j<1> and gummed. The foot-lever h is then depressed to admit fluid pressure to the cylinder f<1> and move the ram f and folding tool d upwardly. Before the tool d engages the blank however the cam d<2> thereon actuates the clamping bar c through the lever i. Continued movement of the folding tool causes the gummed edge of the blank to overlap the ungummed edge and also, by the opening of the valve e<4> by the trip f, movement of the ram e<5> and pressure bar e to seal the joint. When the joint is sealed sufficiently the foot-pedal is released and the valve g<1> consequently lowered to exhaust the cylinder f<1> and allow the spring f<2> to retract the folding tool, the downward movement of the latter operating the lever e' and valve e<4> to permit release of the pressure bar and the lever i to withdraw the clamping bar. The completed tube is then removed from the mandrel. The invention is also applicable to the making of tubes from blanks having waxed or similarly treated edges. Specification 16363/09 is referred to. |
