Patent GB-190719569-A (GB)
Title: Improvement in Bag Bottoming Machine
Inventor: HOWORTH FRANKLIN WISE
Filed: 1907-08-31
Granted: 1908-03-26
Abstract: 19,569. Howorth, F. W., [Union Bag and Paper Co.]. Aug. 31. Paper and like bags.-In a machine for making bellows-sided tubular blanks into bags, the cut and slitted blanks enter by rolls E, E', Fig. 3. A rib E<3>, on a roll E<2>, shorter than the width of a blank, depresses a portion of each blank into recesses C<5> in the folding-cylinder C. The paper is held there by fingers G<25>, g<25>, which move axially into the recesses over the paper. The paper is also held in the recesses by air-suction through ports C<6>, Fig. 5, for which purpose an air box D with an arc-shaped port D', Fig. 35, bears against the web C' of the shaft B<6>, connecting the ports C<6> to the air box from the time a blank enters at the roll E until it leaves at the roll F. If no blank is advanced through the rolls E, E<1>, the finger c<20>, moved by a counterweighted arm c<17>,. falls into recesses in the roll E<1>, closing a valve leading to the air box and preventing leakage of air. This valve is opened by a cam-lug when next approaching the roll E. Guides E<4> keep the blank in position while passing to the roll F, Figs. 3 and 20, when suction ports in the folding-cylinder and the roll F open the bag bottom. Wing folders G<8>, G<53>, g<8>, g<53>, rotatable about axes adjacent to the primary crease of the blank and mounted on curved guides G<7>, G<52>, g<7> g<52> diverging from said axis, enter the folds and are rotated by cam action to open the end into the form shown in Fig. 22. While the opening. is taking place, a member H actuated by a cam and lever supports the upper ply. The blank arrives at the flattening-mechanism mounted on a shaft B<17>, Figs. 3 and 9,rotating oppositely to the,. main shaft, and comprising the arms I<17>, i<17> carrying shafts 1<16> rotated in the same direction as the main shaft. Movable heads I<13>, i<13> carrying flattening- plates I, i are displaced on the shaft by the camactuated levers I<22>, I<25>, i<22>, i<25>, causing the shafts P, i<4>, which are square in cross-section and spirally twisted, to turn the fingers I<10>, i<10>, Fig. 10. The flattening-plates I, i, of substantially the same curvature as the folding-cylinder, collapse the sides of the bag bottom, Fig. 24, and the fingers I<10>, i<10> engage and collapse the front ply. The resultant motion of the arms I<17>, i<17> and of the levers I<22>, i<22> causes the plates I, i to approach the cylinder, and at the same time to approach one another. After this, the wings G<8>, G<53>, g
 g<53> are turned slightly to release the paper and move back on the guides to disengage the side tucks. They are then rotated further to lift them above the surface of the blank and moved back to engage the upper surface, acting as holders. The blank passes under a pasting-roll J preparatory to being operated on by the creasing-mechanism, Fig. 26. A shaft B<29> carries blades K, K<6>, which work against rods C<28> of indiarubber &c. in the folding-cylinder C and define the lines at which the back and front flaps are to be folded. The blades K<6> are mounted on shafts K<9>, which are cam-actuated so as to move the blades towards the blades K after creasing. They are thus out of the way of the fingers L which, actuated by the segment L<5> on the cam-operated lever L<6>, fold over the back flap. Fingers M, m lift the front flap so that it is turned over by the guide N. The guides E<6>, extending into the grooves C<4> on the cylinder C, transfer the bags on to the roll B<30>.