Patent GB-495261-A (GB)
Title: Improvements in or relating to wrapping machines
IPC: B65B19/24
Filed: 1937-05-07
Abstract: 495,261. Wrapping-machines; making paper bags. CHALMERS, J. W., and MOLINS MACHINE CO., Ltd. May 7, 1937, Nos. 13093, 13437, 13949, and 15851. [Classes 94 (i) and 94 (ii)] The machine closes the projecting ends of a wrapper which has been applied in tubular formation to an article, or closes one end of a wrapper which has been applied to a mandrel, to form a container. One end of a packet 12 or container is shown in Fig. 2, after the edges have been brought together by members 15, 16 to produce a flattened seam 21, Fig. 4, and the ends of the tubular extensions have been engaged by folders 17, 18 to move them inwardly to the positions shown in broken lines at 30, 31. The seam is then moved inwardly towards the end of the article and turned flat upon it. The inward collapsing of the parts 19, 20 facilitates the inward motion along straight lines 22, 23 and minimizes the tendency to move along curved paths 28, 29. The resulting form is shown in Fig. 5, and the lugs 99 may be turned down upon the end or sides of the packet. If an article has been preliminarily enclosed in a wrapper to have tubular extending portions at each end, similar operations take place at each end, or one end may be closed in any known manner. The operations may be carried out in a rotary carrier which presents the end of the packet or container first to the adhesive applying apparatus shown in Fig. 8. The adhesive container 40 is mounted on a bracket 41 adapted for longitudinal reciprocation on spindles 42, 53 and for oscillation about the spindle 42. A transfer wheel 58 picks up adhesive and transfers it to the roller 39 which is then moved axially of its spindle 62 by a cam 59 so as to apply gum to the inside of the extending portions 13 of the wrapper. The apparatus is rocked about the pivot 42, to facilitate entrance, by a cam 64 co-operating with an arm 65 and spring 66. Reciprocation axially of the spindles 42, 53 is then effected by a crank arm, as diagrammatically shown in Fig. 9. At each end of the reciprocation, the wrapper is distended to the shape of the roller 39, and adhesive is applied to the ends and one side of the interior. The carrier now moves to a subsequent station and presents the packet to the members 15, 16, Fig. 10. The member 15 is pivoted at 79 to a bracket 80 on a plate 82, and the member 16 is similarly mounted on a sliding plate. The brackets 81, 82 are caused to approach and collapse the end of the wrapper, the relative positions being those shown in Fig. 2. Further movement causes screws 90 to strike abutments 91 and the members swing about their pivots 79 and move the seam 21, Fig. 4, of the collapsed tube and towards the end face of the article. Meanwhile, the folders 17, 18 have formed the indentations 30, 31. During the next movement of the carrier, a fixed spiral folder turns the seam down flat upon the end of the packet, which is now as shown in Fig. 5. Adhesive is now applied to the tabs 99 which are turned either upon the end or sides of the article. This may also be effected by spiral folders. Specification 495,275 is referred to.