Patent GB-198405-A (GB)
Title: A machine for making and filling packets
IPC: B65B45/00
Filed: 1922-02-03
Abstract: 198,405. Day, A. Feb. 3, 1922. Paper bags, making.-Relates to machines for making and filling paper bags with tea &c., or for making bags only without filling them. Paper is fed from a roll 17, Figs. 4 and 5, over a roller 38 actuated by chain gear 35 from an oscillating segment 27, Fig. 5, carrying a number of pawls 31, 32, 33 of slightly different lengths engaging a ratchet 30. If one or more extra webs are to be employed to form linings for the bags, they are fed from rolls 21 so as to leave a margin at the edge at which the main web is gummed by a roll 41 taking adhesive from a roll 42 rotating in a receptacle 43, a scraper 68 removing excess. The applying roll 41 is mounted on a pivoted arm 61 which is raised at intervals to leave a space at which the web is to be cut. The web, after passing over the roll 38, passes between guide-plates 118, 119, Fig. 8, and between knives 103, 107 which sever it. A two-armed lever 105, 106 carries a roller 45 to press the web against the feeding roll 38 and a blade 107 approximately fixed. The movable blade 103 is carried by levers 101, 97 connected by springs 108, 112 to the lever 105, and adjustably to a stud 115 by a spring 114, and cam-actuated to sever the web at the requisite moment. The severed sheets rest on ledges 122, Figs. 4 and 6, in front of plates 82, 83 of the folding box 81, and may be held at one or both sides by spring-urged fingers 125. The box 81 and plates 82, 83 now advance and fold the paper about three sides of the downward extension or former 71 of the hopper 70, the plate 90 being retarded by the former and the plates 82, 83 continuing to advance to make the folds. The leading portions of the paper are folded in by folders 150, 151, Fig. 9, and a rubber covered member presses the seam to ensure adhesion. The paper now constitutes a tube of rectangular cross-section, with the lower part projecting below the bottom of the former. The first fold of the bottom is made by a folding blade 176, Figs. 9 and 12, advanced by a sliding bar 165, a cam surface 184 acting upon the tail of the blade to cause it to turn into the horizontal position at the end of the stroke. The second and third folders 202, 206, Fig. 9, next come into operation and make their respective folds while the blade 176 is still in position. The fourth folder 205, Fig. 13, advances against the remaining triangular tab at the bottom of the former and nips it against the folder 203, which is still in its forward position. The folder then passes across the bottom of the former to fold down the last tab, moves downward with the bag when it is stripped from the former, a web 206, passing through a slot in the side of the mould,. and then backwards, leaving the bag resting on the stationary bottom plate 224 of the mould. Bag-ends of the " double-ear" type may be madeby varying the order in which the folders come into action. A stripper, comprising a vertically moving forked bracket, may be used to ensure disengagement, studs in the bracket coacting with vertical grooves on the former. In order to prevent the web from being fed after a failure in the supply of tea &c. to be subsequently filled into the bag, a balanced feeler may rest on the material in the hopper and be adapted to throw the pawls 31, 32, 33 out of action when the supply fails; or the pawls may be normally disengaged and only put into engagement by the charge acting upon the feeler. In the form of stopmechanism shown in Fig. 20, a flap 322 is hinged on the edge of the hopper 70 and is connected by links to a rocking pawl 325. The flap is lifted by any suitable mechanism to allow the charge to enter the hopper and the pawl 325 thus disengages a projection 333 on a vertical slide 326 carrying a radius bar 331 adapted, in its lower position, to keep the pawls 31, 32, 33 out of action. If, therefore, the flap 322 is not raised and no charge is fed, the slide 326 is not disengaged by the pawl 325 and no feed of paper takes place. In one modification, the web feed may be dispensed with and separate sheets fed by known devices to the folding apparatus. In another form, two or more sets of apparatus may be embodied in one machine.