Patent GB-190428361-A (GB)
Title: Improvements in or relating to Machinery for Forming or Making Paper Bags.
Filed: 1904-12-27
Granted: 1905-12-21
Abstract: 28,361. Day & Sons, J., and Day, A. Dec. 27. Paper b a g s.-Relates to 'open' bags such a= are used for packeting dry soap, tea, &c. The machine described in Specification No. 7731, A.D. 1902, is improved to enable the bags to be made from cut blanks instead of from webs, and tc provide a more suitable manner of forming the longitudinal and end folds and of supplying the paste &c. Blanks fed from the table s, Fig. 3, to an incline t having guides u are transferred to the oscillating grid z by intermittently-rotating rollers l, m driven from the star-wheel 17, which is actuated by the pin 19 on the wheel 20 and has curved surfaces 18 to engage with the raised ring 21, gapped at 21 <x> to allow the star-wheel to rotate. The parts 10, 11, Fig. 7, of the roller m serve to feed forward the blank, while the portion 12, having a notch 13, and the portion 9 carrying a projection n, shaped as shown in Fig. 10, rotate in paste tanks and supply paste for the longitudina! and end seams respectively. When a blank has been deposited upon the grid z, the latter is swung about the centre w by the pinion 30 gearing with the cam-operated segment 29. The grid z deposits the blank upon a slide, which carries the blank to the folding-box and is operated in the manner described in the prior Specification. When a second blank is required to form a lining for the bag, it is drawn off from a hopper 33, Figs. 11 and 13, by a reciprocating cam-operated slide 34 having a recess 35 to engage with the blank. When the blanks are in position over the folding-box, the former g descends through the fork 36 in the slide 34, the latter being raised during this operation to prevent paste from adhering to its under surface. The upstanding flaps, which are so arranged that one is much longer than the other, are folded over by two folders 94, 64, Fig. 21, the former of which is a sliding folder operated similarly to the folders described in the prior Specification, while the latter is pivoted at 66 and is operated by a pivoted link 63 driven from the longitudinallyoscillating rod 70. In order to retain the longitudinal folds in position during the subsequent operations, each former g is provided with a spring- pressed piece 44, Fig. 14, which is pivoted at 45 and carries an india-rubber pad 47. As soon as the longitudinal folds have been completed, the cam-operated rod 52, Figs. 13 and 14, descends, thereby allowing the pad 47 to grip the folds. The former g is then raised from the mould box and is rotated to the position 92, where, as it again descends, two opposite sides of the projecting end of the bag tube are turned partly inwards over the end of the former by means of the inclined faces 89 of the fixed piece 88, Fig. 30. After the flap 1, Fig. 1, has been completely turned in by means of a pivoted folder, the former g is raised and rotated to the station 96, where gum to secure the flaps 3, 4, Fig. 1, is supplied from a tank 73 by means of a paster 95, Figs. 24 and 25, which is turned about the pivot 95<a> by the rod 85 pivoted to the oscillating lever 80. The end folds are completed by the oscillating folders 77, 78, and the former is then turned to the station 93, where, as the frame f descends, the gripper 44, Fig. 14, is raised by means of a fixed pin 61 bearing against the lug 48, thus allowing the bag to be withdrawn from the former. The troughs containing the mucilage may be water-jacketed and provided with suitable gas or other heating-apparatus to keep the mucilage in a liquid state. When it is desired to adopt the arrangement of bottom folds described in Specification No. 11,303, A.D. 1904, the arrangement of folding-levers described in that Specification may be employed.