Patent GB-310182-A (GB)
Title: Improvements in machines relating to the manufacture of envelopes
IPC: B31B19/00
Filed: 1928-04-18
Abstract: 310,182. Warrington, W. W. April 18, 1928. Envelopes, making.-A machine for making envelopes comprises a framing, means for feeding previously formed blanks individually from a pile to an endless conveyer whereby the blanks are carried to a second conveyer or endless rotative element carrying gripping means adapted to be engaged with or released from the blank, rotatable means for applying adhesive to the blanks after they have been engaged by the gripping means, means for tensioning the blanks before their release from the endless element, creasing means operable immediately after the release, and gripping and folding means for folding the blanks to envelope form. The lowermost blank of a pile of blanks 60, Fig. 2, on a platform 3 on a table 2 is drawn away from the pile by rollers 36 having rubber insertions. The rollers 36, which are carried on shafts 38 mounted in the framing 1 of the machine and are driven through gearing by a main shaft 44, pass the blank beneath a. roller 9 and on to an endless belt 10 driven by a sprocket and chain from the.shaft 38, the blank being held on the belt 10 by rollers 20 which are supported' by a rod 18 secured to a bracket 17 on the table 2. The blank thus impelled by the belt 10, comes to rest against stops 25 secured to a rock shaft 22 and there remains until an arm 23 secured to the shaft 22 is raised by one or other of two cams 66 on one of two rollers 28 secured to a shaft 29 rotatable in the framing 1. A spring 27 secured to the shaft 22 presses the freed blank against the roller 28, and contact is maintained by rollers 33 so that printing projections on the rollers may apply adhesive to the blank, the adhesive being supplied from a tank 61 by rolls 60. 62 driven by a gear 47 on a shaft 48 and geared to the main shaft 44. The blank is drawn around the rollers 28 by an endless rotative element or chain 51 mounted on sprockets on the shafts 44, 29 respectively. Spaced apart at equal intervals on the chain 51 are pivoted gripper arms 68, Fig. 10, spring-pressed against plates 71 and provided with extensions 69 by which the armsare raised from the plates 71 to release a blank and receive a succeeding one. As the blank passes the finger 27, a cam 74, on the framing 1. which has held open the gripper arm 68, releases it to allow it to engage the blank. A shoot 75 beneath the rollers 28 and chain 51 is provided with guide frames in each of which a series of balls is mounted, the balls tensioning the blank as it passes between the shoot and the guideframes. The blank now passes beneath the shaft 48 on which are mounted two elements 78 each having extensions 79 which crease the blank. The creasers operate against a folding table 82 adapted to roll along endless tracks 80 secured to the framing 1. A series of tables 82 is connected together by links, the links on one side being formed with rack teeth 83, Fig. 14, which form a continuation of racks 86 provided on the tables 82 ; the gear 47 engages these racks to move the tables along the tracks 80. As the creasers 79 engage the forward portion of the blank, a cam 115 engages the extension 69 of the gripper arm 68 and releases the blank from the chain 51, the blank being simultaneously engaged by a catch finger 102, Fig. 23, on the table 82. A second pair of catch fingers 103 engage the latter part of the blank as the creaser 79 leaves it. The fingers 102, 103 are each mounted on a rock shaft beneath the table 82 and are operated by fixed cams 108<a> on the framing 1. Each table 82 is formed with a recess in which a platform 88 is pivoted and around which folding flaps 89 - - 92 are disposed. The flaps are pivoted by pintles 130 tobase plates secured to the table 82, each pintle- 130 carrying a mutilated spur pinion 106, Fig. 29, adapted to be engaged by a. rack bar 105 slidable in a downward extension 104 to rotate the flap and fold over a portion of the blank. The bars carry rollers which are engaged by fixed cams such as 110, 111, 112, Fig. 2, to effect the folding. As the table moves along the tracks, the leading flap 90, the rear flap 89, and the side flap 91 are successively folded, the catch fingers 102, 103 are released, and finally the second side flap 92 is folded over. During this last folding operation, a finger 85 on the rack 86, Fig. 14, engages one of four bars 120 pivoted about a spindle 117 and causes another of the bars to pass beneath the last folded flap. Simultaneously, a fixed cam engages a roller 94, Fig. 29, beneath the platform 88 to raise it and the bar 120 delivers the envelopeon to a fender 123.