Patent GB-726088-A (GB)
Title: Machine for making sliding drawers for boxes
IPC: B31B50/00
Filed: 1953-02-26
Abstract: 726,088. Making boxes. HJORTH, K. Feb. 26, 1953 [Feb. 28, 1952], No. 5405/53. Class 18. A machine, for making sliding drawers for boxes, each drawer consisting of a curved body and a pair of flat end pieces, comprises two parallel conveyer bands of which one carries gripping elements, in which pairs of end pieces are held the length of a drawer apart, and the other comprises a number of former elements adapted to grip and shape each body and hold it during the parallel travel of the conveyer bands, the body being,coated with glue along its edges and laid over the end pieces at one end of the machine and held by the former elements until it has been released by the gripping elements. The box bodies 2 are fed in strip 50 from a roller 49 through rollers 51 which apply glue to the edges of the strips, feed rollers 52, cutting rollers 53, which cut the strip into lengths and rollers 54, 55 which deliver the strips to the conveyers. The lower conveyer comprises two endless chains 3, passing over sprockets 4, one or both pairs of which are driven, the chains carrying between them, at intervals, base plates 5 supporting gripping elements comprising teeth 8 and slits 9 on either side of a fin 7. The end pieces 1 are held in slits 9 by spring fingers 10 attached to longitudinally movable rods 11 mounted by a mortice or dovetail on rails 12. Rails 12 are moved longitudinally by screws 13 and simultaneously moved up and down by push rods 14. The rods 11 are held by springs 15 so that fingers 10 engage teeth 8 but the hold may be released by pressing a rod 16. The upper conveyer comprises two endless chains 18, mounted on sprockets 19 one or both pairs of which are driven, and carrying former elements spaced to coincide with the gripping elements of the lower conveyer. The former elements comprise a rectangular stirrup 20 secured at each end to the chains and carrying a former 22 having arms 23 slidable in dovetails 24 of stirrup 20, Fig. 5, and carrying a buffer 25 shaped to correspond with the end pieces 1. Elastic strips. 26 are secured on either side of former 22, Fig. 6, and are secured at their other ends to rods 29 supported in arms 30 projecting from stirrup 20. Rods 29 have, at one end, ratchet wheels 31 engaged by spring biased releasable ratchet pawls 32, the rod having an extension 35 for a crank handle or the like to tension or slacken the elastic band 26. Mounted in pairs opposite one another on arms 23 are further arms 36 carrying gear wheels 38, opposing wheels 38 engaging racks 39 on rods 41. Rods 41 engage notches 42 in the stirrup 20 and clips 43 attached to arms 23 and are interconnected by crossbar 44. Crossbar 44 is held by springs 45 secured to stirrup 20 against arm 23 and former 22 is similarly held by springs 46. The upper ends of rods 41 carry rollers 48 and clips 43 carry rollers 47 and these rollers 47, 48 engage either side of a fixed bar 56 as the conveyers move. Former 25 is lowered on to the box drawer and rod 41 and hence racks 39 are raised so that rods 36 pivot downwardly and carry strips 26 round the box drawer, Fig. 8, to hold the body 2 and end pieces 1 together until the glue has dried. End pieces 1 may be fed to gripping elements 8, 10 from a magazine consisting of four adjustable rods 60, 61 in which the end pieces are pressed against a stop 64. A slit is formed between stop 64 and a plate 65, whose width corresponds with the thickness of the end pieces, and an electrically operated vertically movable plate 67 is arranged to push an end piece 1 up through, the slit, when an element 8, 10 is in a suitable position to receive an end piece, and then move down to allow the next end piece to engage stop. 64. Plates 67 are interchangeable as they must fit the end pieces in use. A separate feeding arrangement is needed for each end piece.