Patent GB-941883-A (GB)
Title: A machine for completing the wrapping of partially wrapped articles
IPC: B65B11/12
Filed: 1960-09-20
Abstract: 941,883. Wrapping machines. W. F. STREMKE, W. F. STREMKE, jun., and R. A. PAZDERSKI. Sept. 20, 1960, No. 32277/60. Heading B8C. A machine for completing a partially wrapped package supplied to it in the condition shown in Fig. 11 forms corner tucks and folds end flaps 135 down against the sides and bottom where they are heat sealed and air cooled. An operator places the partially wrapped filled container 105 or flat board 106 with an article on it (see Fig. 10) between rails 136 and 137, Figs. 3, 5, and a flight 50 of a conveyer 46 moves the package towards the rear of the machine, i.e. to the left as shown in Figs. 1, 3, rear tuckers 69 tucking in the trailing edges 154 of the flaps 135. Folders 60 then move downwardly, folding flaps 135 against the sides of the package. The flaps are held until engaged by heated plates 205, 206 which commence the folding of the flaps on to the underside of the package while the latter is held down by bars 214,215 (Fig. 10). Heated front tuckers 225 and 226 operate as the package is moving on to the plates to tuck and fuse in position the points 223 and 224 (Fig. 14) of the wrapper. Final movement of the flaps inwardly on to the underside of the container is performed by members 243 and 244, and a triangular notch 250 in a hot plate 249. The pusher 50 moves the package on to the hot plate and returns to the front of the machine by way of the underside of the conveyer 46. A pressure plate mechanism 68 descends to rest momentarily on the top of the package to assist fusing the flaps 135 in position. Finally a pusher bar 96 on conveyer chains 85, 86 moves the package on to a grid 275 where it is cooled by a fan 276. Folder and tucker details.-The rear tuckers (Figs. 6 and 7) each comprise an arm 158 rotating in a clockwise direction on a shaft 73 having a spring biased bar 162 pivoted to it at 163. A tucker plate 167 fixed to the bar 162 has fingers 170 and 171 which differ in length to deal with packages of different heights. The arm 158 rises behind an end flap 135 (Fig. 7). A roller 175 mounted on the frame of the machine causes, on contact with the lower end of the bar 162, the tucker plate to rotate faster than the arm 158 against the action of the spring 161, thus tucking in the trailing edges 154 of the flaps 135. On continued rotation of the arm 158 the contact between the roller and the bar 162 is broken and the bar and tucker plate return under the action of a spring 161 to their initial position relative to the continuously rotating bar 158. The down folders 60 (Figs. 1 and 5) pivotally mounted at 192, one at each side of the machine, and supported by cam-operated rods 197 fold the flaps 135 down as shown in Fig. 5. The down folder plates are provided with supplemental down folder bars 193 pivoted at 194 which rest on the top of the package when the down folder plates are actuated if the package is of the correct length but fold down the flaps 135 under the weight of the down folder bars when acting on a shorter package. The tuckers 225, 226 are merely spring-biased into an operative position. They may be rendered inoperative when substantially flat packages are being produced. Adjustability.-The machine is adjustable for various heights and widths of package, the folding devices being carried on opposed longitudinal supports adjustable transversely of the machine. Specification 941,882 is referred to.