Patent GB-205234-A (GB)
Title: Improvements in machines for the manufacture of paper bags
IPC: B31B3/32
Filed: 1922-07-21
Abstract: 205,234. Jackson, J. E. Evans-, (Hesser, Maschinenfabrik-Akt.-Ges., F.). July 21, 1922. Paper bags, making.-In machines for making simultaneously a plurality of paper bags with a single or multiple lining of the kind having a plurality of folding mandrels mounted upon an intermittently rotated carrier, the mandrel carrier co-operates with a plurality of devices for simultaneously sticking together and feeding outer sheets and linings, with a plurality of devices for simultaneously folding the outer and the lining sheets around the mandrel to form a tube, with a plurality of devices for folding and connecting the bottom upon the front of the mandrels, with a plurality of devices for pressing the closed bottom on the front of the mandrel, and with a plurality of devices for stripping the bag from the mandrel. The machine described produces two bags simultaneously, one at stations I - - IV, Fig. 2, and the other at stations V - - VIII. The sheets A from which a bag is formed are stored in a magazine 100 disposed beneath a vertically reciprocated plate 1, Fig. 4, having three projecting ribs to which adhesive is applied by a horizontally reciprocated roller 10 charged by contact with the roller 16 of a gum trough 112. The lining is cut from a web T which is continuously pulled off a reel R by rollers 26, 26<1>, Fig. 3, and fed forwards to the knives 28, 124 by intermittently rotated rollers 120, 121. The severed sheet is placed against a stop 30 on rails 126, 127 by an abutment 130 mounted on a bell-crank lever oscillated by cam mechanism. The rails are disposed above plates 600, 601. After strips G<1>, G<2>, G<3> of adhesive have. been applied to the top sheet A, this sheet is raised by the plate 1 until it comes into contact with a frame 116. The upward movement is then temporarily stopped and the sheet is gripped by paws 35, 35<1>, which detach it from the plate and feed the sheet on to the plates 600, 601. This sheet and the severed lining are conveyed simultaneously to the folding box 45 by gripping jaws 36, 36<1>, which, with the jaws 35, 35<1> are mounted on a horizontally reciprocated bar 40, Fig. 5, carried by a slide 604 which is given a swinging up-and-down movement. The movable jaws 35, 36 are pivoted at 602, 603, respectively, in the bar 40 and are coupled by arms 606, 607 and a rod 608. Springs 609, 610 disposed between stops 700, 701 on the rod 608 and stops 611, 612 on the bar 40 tend to keep the movable jaws in contact with the fixed jaws. An arm 327 attached to the bar 40 carries a roller 326 which is engaged by the fork 325 of a pivoted arm 38 oscillated by mechanism not shown. The slide 604 is supported by pivoted arms 41, 41<1>, the latter of which is oscillated by a cam rod 140. A roller 622 mounted in an arm 621 attached to the jaw 36 comes into contact with a pivoted stop 614 during the movement of the bar 40 from right to left, Fig. 5, and causes the opening of the jaws to receive the sheets. At the end of this movement a roller 625 mounted in an arm attached to the jaw 35 comes into contact with a stop and both jaws are opened to release the sheets. The bags are formed by folding mandrels 70 mounted radially on a plate 142 secured to a vertical shaft which is rotated intermittently so that each mandrel will come successively into the positions marked I, II - - VIII. The folding box 45, Fig. 6, is mounted on a vertically reciprocated hollow rod and contains a U-shaped presser 628 mounted on a rod 127<1> which slides in the hollow rod. Members 628<1>, 628" at the top of the presser 628 press the papers against the underside of the mandrel 70. Rails 53, 54, Fig. 3, are slidably mounted in side flanges 148, 149 of the box 45 and are guided by brackets 55, 56 on spindles 57, 58 fixed on rails 59, 60 which are reciprocated on the table P. Folding plates 51, 52 are attached to the rails 53, 54. Press plates 71 are pivoted to arms 152 hinged to the plate 142 and pulled downwards by springs 153. At positions I and V the press plates are raised bv mechanism not shown. As soon as the papers are deposited on the box 45, the box moves upwards and envelopes the mandrel 70, thereby shaping the composite sheet as in Fig. 20. The slides 52, 51 are next moved forward to fold over the flaps c, d, Fig. 21, and the strip of adhesive G<2> causes the flaps to adhere when acted on by the presser 71. Jaws not shown also grip that part of the flaps projecting beyond the mandrel and press them together. The mandrel 70 now moves to position II and the bottom of the bag is closed by the two lateral folders 360, 364, Fig. 2, and top and bottom folders 67, 82, Fig. 11. Folders 360, 364 are mounted on arms 177, 178, which are swung about a pivot 362 by cam mechanism to fold over the side flaps h, i, Fig. 22, and thereby form pointed ears k, m<1>. The arms 901, 902 carrying the folders 67, 82 are pivoted to a standard 905 and are actuated by cam &c. mechanism. Adhesive is applied to the bottom at n, Fig. 22, by a stamp 87, Fig. 13, mounted on a reciprocated carriage 423 and coated with gum by a roller 382, which moves from the roller 80 in the gum trough to the stamp and back again. Pressure is exerted on the flaps after being gummed, and during the withdrawal of the gummer, by a frame 430 which is slidably mounted on stamp 87 and is acted on by springs 461 In the position of rest the frame is withdrawn behind the stamp by the arm 435 of a double-armed pawl, the other arm 437 of which abuts against a pin 438 adjustably mounted on a standard 424. When the stamp moves forwards, the springs force the frame in front of the stamp. After the rearward movement of the stamp, the folders 67, 82 move towards each other and fold the ears k, m<1>, thus completing the bottom of the bag, Fig. 23. In a modification (not shown) the folders are arranged to produce a bag bottom, as in Figs. 27 and 28. The forward movement of the gummer 87 is prevented unless a bag is on the mandrel by the following mechanism. A feeler 402, Fig. 13, is mounted in an arm 401 attached to a lever 450 pivoted at 405 and controlled by a spring 403 which tends to pull it into the position shown. An arm 409 is pivoted to the bolt 405 and is provided with a stop 407 which is forced against the lever 450 by a spring 406. An abutment 409<1> on the arm 409 can be placed in the path of an abutment 410 on a slide 423. A screw 400 mounted in the arm 401 bears against a folder 82. When the folder 82 moves into the position shown, the feeler 402 moves upwards, and if the bag is on the mandrel, its movement is stopped on contact and the abutments 409, 409<1> are kept out of alignment. If there is no bag on the mandrel, the feeler continues its upward movement, the abutments come into contact, and the movement of the slide is stopped. When the mandrel moves to position III, the bottom is pressed down by a presser 486, and at position IV the bag is stripped by an injector 185 of known construction and fed on to a box 95 which is then moved to position C. The bag is then flattened and delivered to a trough 191.