Patent GB-680115-A (GB)
Title: Improvements in or relating to wrapping machines
IPC: B65B11/26
Filed: 1949-06-03
Abstract: 680,115. Wrapping-machines. FORSTER, L. G. June 3, 1949, No. 15032/49. Class 94(i) In a machine for forming block-ended packages. the article and wrapper are pushed through a foldin box whereby the wrapper is folded around the article as indicated at A-D in Fig. 2 to form an open-ended package which is brought to rest in position E. Side tucks are then formed by tucking elements 22, 23, which are moved in triangular paths as indicated by the arrows 25, 35 and 36, and the upper flap is folded down by a flange 38 on a vertically-movable plate 37 which then engages the top of the package and pushes it downwardly past a fixed member 39 which folds up the lower flap. The package is supported during the tucking operation on hinged supports 21, Fig. 4, which swing downwardly against the action of springs 89 to allow the subsequent downward movement of the package on to a stack of completed packages held between brushes carried by vertical frame members 80, this movement causing ejection of the lowermost package on to a delivery conveyer (not shown). The tucking elements 22, 23 are each mounted in a holder 46, Figs. 4 and 5, and held in position by a bayonet joint against the action of a spring 51, whereby they may be readily removed and replaced by elements of different shape or dimensions. Each holder is pivoted at 49 to a channel section guide 55 integral with an arm 56 connected by a pivot 57 to a member 58 which is pivoted on a transverse spindle 59 and carries a control arm 60 formed with an extension 61 on which is mounted a roller 50 supporting the inner end of the holder. The tucking elements are actuated by radial and face cams 62 and 63 on driven shafts 41, the cams 62 engaging rollers 54 on the arms 60, and the cams 63 engaging rollers 66 on the arms 56. Each holder 46 is maintained in engagement with its supporting roller by a spring 34 which is connected between the arm 56 and a clip 32 which may be disengaged to allow the holder to be swung upwardly when it is desired to remove the tucking element. The undersurface of each holder is suitably curved to compensate for the vertical component of movement imparted to the pivot 49, so that the tucking elements move in substantially horizontal paths. To allow bulging of the upper and lower parts of the wrapper during the tucking operation, the top plate 12 of the folding box is cut-away as shown in Fig. 5 and the member 39 is formed with depressions 31, see Fig. 9 (not shown). The plate 37 is secured by screws 30 to a bracket 75 which is adjustably secured to a rod 71 slidable in bearings 53 and 72, the rod being moved downwardly against the action of a spring 74 by a cam 68 on a driven shaft 45. After completion of the folding operations, the package is held by fixed brushes 91 adjustably secured to the frame members 80, a small tab brush 93, see Fig 6 (not shown), which engages the end folds through slots in the folding flange 38, and a pivoted, spring-loaded brush 92 which presses the package against a heated plate (not shown) to effect sealing of the end folds as the package moves downwardly. The pivot 97 of the brush 92 is adjustable in a slot 100 and an adjustable stop 99 is provided for setting the brush in accordance with the length of the packages. The frame members 80 form part of a unit which is held in position by clamps 84 and may be readily removed and replaced by one of different size. The supports 21 may be arranged to be swung downwardly by extensions 90 of the plate 37. Specifications 645,418, [Group XXX], 668,080, 668,081, 668,082, [all in Group VIII], 680,187 and 680,188 are referred to.