Patent GB-224659-A (GB)
Title: Improvements in or relating to apparatus for folding the end of a bag or container
IPC: B31B3/28
Filed: 1923-09-26
Abstract: 224,659. Rose, W., and Rose Bros. (Gainsborough), Ltd. Sept. 26, 1923. Paper bags, making.-The invention relates to a machine for folding down the end of a cylindrical tube in eight subdivisions to form a bag. Two pairs of subdivisions are folded at right angles to each other, while two more pairs take diagonal positions. The tubular blanks 4 are carried by formers 1 driven round a vertical shaft by Geneva-stop or like mechanism. Alternatively, bags which are filled with material may be supported in suitable holders while the end is folded. The first folding blade 5 is carried by an arm 6 which is pivotally mounted in a, bracket on the machine frame and connected by linkwork with a cam 10. Side wings 20, 20<a> on the blade 5 assist in the correct formation of the fold. The former 1 is then turned into position for the formation of the second fold and three side folds. The second folding blade 21 is carried by a spindle 32 rotatably mounted in bearings 22 on an arm 23 which is mounted a spindle 24 carried by a bracket 25. An extension 26 of the arm 23 is engaged by a cam 29 to bring the blade 21 towards the end of the former, while a second cam 35 engages an extension 37 of an arm 34 carried by the spindle 24 so that a tooth segment 33 of the arm 34 engages a tooth segment 31 on the spindle 32 to turn the blade 21, thus forming the second fold. The second fold preferably overlaps the first. A vertical spindle 45 carries a bracket 39 which supports mechanism for forming the side folds and is brought into position by means of a spring 42 and a cam 44. A folder carrier 49 is pivotally mounted on a spindle 51 carried by the bracket 39. The carrier 49 is oscillated by means of a tooth segment 59 on the spindle 51 engaging a tooth segment 60 on an arm 61 carried by the spindle 45, The arm 61 is operated by means of a spring 64 and a cam 63. A " beak " 55 is pivotally mounted on a vertical spindle 56 on the carrier 49 to engage the inside of the third fold while a blade 50 mounted by the carrier 49 engages the outside of the fold. The beak 55 is provided with an extension 67 having a roller 66 engaging a cam groove 68 on the bracket 39, so that as the carrier 49 is oscillated, the beak 50 moves into operative position and forms the third fold. Two folders 69, 75 for the fourth and fifth folds are carried by spindles 70, 74 having engaging pinions 72, 76. The pinion 76 is engaged by a rack 77 rotatable about the spindle 56 and provided with a roller 80 engaging a cam groove 82 on the bracket 39. Movement of the carrier 49 causes the folders 69, 75 to move inwardly and form the diagonallyplaced fourth and fifth folds on each side of the third fold. The bracket 39 then retires and the former 1 is turned into position for the formation of the three last folds. A stationary bracket 83 carries a spindle 86 on which a carrier 84 operated by tooth segments 90, 91 oscillates. The tooth segment 91 is carried by a spindle 94 on the lower end of which is an arm engaging the end 99 of a tubular cam on the shaft 24. The other end 110 of the cam engages an arm 108 carried by a spindle 106 on which is an arm 103 terminating in a presser foot 104 which retains the completed folds in position, and also creases the projecting part of the blank for the formation of the eighth fold. A beak 88, operated by a cam groove 102, and a blade 85 on the carrier 84 form the eighth fold, while a folder 111 on a spindle 112 and a corresponding folder (not shown) form the diagonally-placed sixth and seventh folds. The sixth and seventh folders are operated by a tooth segment 116 and a cam groove 119. Gum is applied in suitable positions on the blank and a plunger presses the end of the bag, the third fold having been retained in position by a tabber. The end of the former 1 is preferably chamfered, as shown in Fig. 11, to present the appearance of an octogon. Fig. 10 shows the end of the bag completed with eight folds S<1> - - S<8>.