Patent GB-136958-A (GB)
Title: Improvements in and relating to the Manufacture of Container Structures.
Inventor: ALEXANDER ALBERT EDGAR
IPC: B31B50/48
Filed: 1919-02-20
Abstract: 136,958. Alexander, A. E., (Stokes & Smith Co.) Feb. 20, 1919. Boxes made from special blanks; machines and apparatus for making boxes. The box, Fig. 14, is formed with multi-ply ends and reinforced edges from a relatively thin paper blank, Fig. 10, which is placed upon two adjustable plates 203, Fig. 1, having adjustable gauges 203<a> and pressed down between the plates to a spring-controlled platen 71 and folding-devices by a special former, which may be fitted to standard machines in general use. The blocks 28, 50, Figs. 1 and 6, of the former are of the same size, corresponding to the size of the bottom b of the blank, and are operated by a slide 27 and rods 47 respectively, an intermediate block 200 being slidably mounted on the block 28 and connected to the block 50 by adjustable bolts 201. Springs 202 surround the bolts between the blocks 50, 200, which have recesses, within which the springs are housed when the blocks are in contact; recesses are also provided in the block 28 to house the heads of the bolts 201 when fhe blocks 28, 200 are brought into contact. The rods 47 are connected above the slide 27 by a cross-head 48 connected to the slide by a spring 52, and the slide and rods are operated, as shown, from a cam 42. The former, at the beginning of its downward movement, has all the blocks in contact and, in carrying the blank to the platen. co-operates with the edges of the plates 203 and adjustable depending plates 204, to fold the sides a, c and wings a<1>, c<1> of the blank upwards. A dwell in the cam 42 then causes the movement of the former to be arrested, and folding-blades 211, Fig. 5, advanced by bars 81 fold the upstanding wings a<1>, c<1> of the blank along the lines x, the downward movement of the former being resumed before the folding operation is completed and allowing brushes 93 or rollers located below the folding-blades to fold the ends b<1> upwards. The blades 211 are carried at one end of levers 208 pivoted in arms 206 adjustably clamped to the bars 81, and are swung inwards, to fold the wings, upon the inward motion of the bars 81 by reason of rollers 209 at the other end of the levers 208 engaging fixed bars 210; springs 212 keep the rollers in contact with the bars. One of the blades 211 at each end is arranged to fold. slightly in advance of the other, so that the two wing formations are not brought into contact. On completion of the wing-folding operation, a pin 63 on the cross-head 48 contacts with a plate 62 carried by a lever 60 operated by the cam 42, and temporarily holds the block 50, the combined downward movement of blocks 28, 200, held in contact by the springs 202, completing the folding of the ends b<1> until the block 200 becomes stationary by reason of the bolts 201. The block 28 then reaches its lowest position, and the adhesive, laps a<2>, b<2> are inturned over the block 200 by tucking- in fingers 96, the edges of the box being clamped and supported by the block 200 and presser-blocks 98. After the lap-inturning operation has commenced, the blocks 98 are preferably withdrawn, and the blocks 50, 200 continue their downward motion under the action of the spring 52 until the block 50 is arrested by contact with the fingers 96; these fingers then withdraw, and the laps are turned down and clamped to the inside of the box by the downward motion of the block 50, the block 200 being held against the block 28. The blocks 98 are then again advanced to set the adhesive connexion between the parts, and are finally withdrawn, whereupon the slide 27 moves upwards, taking the box with it; the box is stripped from the former when it is above the plates 203. The box may be formed from a blank without a cover portion d when the part c is provided with a lap that is inturned and clamped as described above. In a modification, the wing- portions a<1>, c<1> are triangular in shape and do not become doubled; in this case the folders have a simple advance and retreat movement. The plates 203, 204 may be movable to increase the distance between the parts thereof on the return movement of the former and box, so as to obviate the liability of the box contracting therewith.