Patent GB-770124-A (GB)
Title: Wrapping machine
IPC: B65B11/12
Filed: 1955-05-16
Abstract: 770,124. Wrapping-machines. PACKAGE MACHINERY CO. May 16, 1955 [June 28, 1954], No. 14037/55. Class 94(1). A wrapping machine in which a wrapper is folded round a rectangular section article during continuous travel so that the wrapper covers the leading face of the article and two adjacent opposite faces, has means to fold an extension of the wrapper portion on one adjacent face against the trailing face, and lapping means comprising an element to clear temporarily the wrapper portion on the other adjacent face from that face and a further element to tuck an extension of the wrapper portion on the trailing face between the other adjacent face and its wrapper portion. The wrapper w may be cut from a web 4, Fig. 1, and fed into the path of the articles a advancing on a conveyer 3, in known manner, folders 11 and 12 folding the wrapper about the leading and adjacent faces, and members on a conveyer C passing the articles through the lapping station and folding the wrapper against the trailing face leaving an extension b, Fig. 9, trailing the articles. After tucking the wrapper, end folds are formed in known manner by folders such as 93, 94 and heat sealed by plates 111 Fig. 1. In one embodiment, Figs. 1, 4, 9, 11, members 15 on a conveyer 16 fold the wrapper extension onto the trailing face and push the article along a fixed table 17 having slots 18 in which slide supporting members 19 on a horizontally reciprocating bar 20. The bar 20 carries a folding plate 40 and a pivoted glue applying blade 41. A similar reciprocating bar 27 has members 25 sliding in slots 24 in a fixed table 23 and has pivoted to it a suction head 75. Each article slides over the bar 20 in the latter's rearmost position and into a position in which the suction head engages the wrapper portions c and b. The bar 27 now advances with the article and the head 75 pivots downwards pulling the portion c clear of its article face and the portion b into the vertical plane. The bar 20 also advances, the blade 41 picking up adhesive from a glue wheel 60. The speed of the bar 20 increases to beyond that of the article so that the plate 40 folds up the portion b against the article. The portion c is released having received adhesive from the blade 41, and is pressed onto the portion b by surfaces 26, 27. The articles may pass over a conveyer 73 carrying heat sealers 72. In a second embodiment, Figs. 12, 13, 16, the lapping means are carried in groups on a continuously moving conveyer 130 and comprise a folding blade 210 and pivoted suction head 145. A member 142 on a conveyer 143 folds the wrapper onto the article trailing face as before and feeds the article from a table 140 onto slats 137 forming part of the conveyer 130. As the wrapper part b leaves the table 140 it springs into the vertical plane. The part c is gripped by the suction head 145 which pivots downwards while the folding blade 210 makes a combined upwards and forwards movement to lay the part b onto the bottom face of the article. The suction head pivots into the horizontal again to lay the part c on the part band the blade 210 withdraws. The article is fed onto a stationary table 141 to the further folders &c. The blade 210 and suction head 145 are operated by cam rolls 192, 176 travelling over stationary cams 193, 177. Suction is supplied from a channel 173 in a box 160 closed by a moving belt 157 having apertures connected to the suction head of each group by members 149-151. In a further embodiment, Figs. 21, 25, each article is gripped by a plate 240 and resilient blocks 244 249 on a conveyer 227 (the plate folding the wrapper onto the trailing face) for transit past rotary lapping means 258 operating in a'gap in a stationary table 226. The lapping means comprises (for each lapping operation) U-shaped rods 265, 270 which engage the part c after it has been allowed to drop clear of its article face, and bend it forwards, and a blade 260 which lays the part b on the lower article face. As the article is brought over the table 226 again the part c after having been bent against the table, edge by the blade 260, is laid onto the part b.