Patent GB-143316-A (GB)
Title: An improved method of and mechanism for making covered box shells
IPC: B31B15/00
Filed: 1919-02-20
Abstract: 143,316. Smith, H. B. Feb. 20, 1919. Covered and lined boxes; machines for making boxes.-A box-shell blank A, Fig. 2, and a cover blank B, of greater dimensions than the shell blank, a.re superposed and secured together in the flat condition, and marginal portions of the cover blank are inturned and secured to the inner face of the shell blank, before any folding operations are commenced. After the sides b are folded up, the end laps d are turned in, the projecting portions e of the cover blank being cut or torn in the operation, and the part h, Fig. 4, becoming attached to the inner sides of the end wings c and covering the raw edges of such wings. The blanks are not secured along the portions adjacent the folding lines, so that the cover blank is not strained during the folding operations. The blanks are preferably formed from webs in the machine shown in Fig. 7, the web 1 forming the shell blanks being drawn, with an adhesively-secured lining-web 2 if desired, through rollers 7, 8, the roller 7 being provided with scoring-blades and cutting-dies, so that the web is cut and scored into sections, Fig. 10. The adhesively-coated cover blanks are formed from. a web B, which is secured to the sectional web 1 by rollers 17, 18, the roller 18 being provided with longitudinal and transverse grooves corresponding to the folding lines, so that the webs are not closely united adjacent those lines. After being united, the com posite web passes between a pair of folding-horns 20 and pressure device 24, 25, by which the marginal laps g are turned over and secured to the face of the shell web, the composite web being then cut into sections by rollers 27, 28. Each section passes through feed-rollers 29, 30, 31 (the roller 30 having flanges which turn down the sides b of the section), and between vertical rollers 33 to a stop 34, against which the forward end of the section abuts, to position the section over a reciprocating plunger 35 provided with a plate 41, which may be independently operated. Wing folders 36 turn in the end laps d and, in doing so, cut or tear the portions e as described above and secure them to the end wings c. The plunger then carries the partly folded section between rollers 37, which turn down the wings c, to presser-blocks 38, which clamp the walls of the box to the plunger, the plate 41 being meanwhile arrested, while fingers 40 turn in the marginal laps f between the plunger and the plate. The presser-blocks are slightly retracted and the plate 41 operated to turn in the laps f against the inner faces of the walls c, the presser-blocks being again caused to press against the walls firmly to secure the parts, after which they are again retracted and the box carried into a well 43 provided with brush-walls 44, which retain the boxes while the adhesive sets. Spots of adhesive may be applied to the wings c by a roll 21, to hold the blank in the set-up condition. If the cover blank B is covered with adhesive, a " tight-wrapped " box results, while a " loose-wrapped " box is obtained by applying the adhesive in stripes or zones.