Patent GB-268281-A (GB)
Title: Improvements in or relating to wrapper tabbing apparatus
IPC: B31B1/90
Filed: 1926-09-14
Abstract: 268,281. Stokes & Smith Co., (Assignees of Stokes, J. S.). March 25, 1926, [Convention date]. Labelling.-Means for re-inforcing wrappers, labels, &c. with tabs and for applying them to cartons and boxes comprise a device for applying adhesive to the wrapper which, before the adhesive sets, is carried to a machine for applying reinforcing tabs to the coated surface, the exposed faces of the tabs being then coated with adhesive and the tabbed wrapper applied to a box before the second coating of adhesive sets. The coating, tabbing, and conveying operations are effected by self-contained units, each of which is operated in timed relation with the others and with the wrapping machine. Adhesive-applying device. A suction roller 1 delivers single unglued wrappers from a stack 2 through rotary feed rolls 3 to a gluing roll 4 which engages a glue drum 5 mounted to dip in a glue receptacle 6. Sheet conveying mechanism. Endless chains 11, 11<a>, each carry a pair of wrapper grippers V, which may be of the kind described in Specification 254,684, comprising a base 19 attached to a link-pin of the chain, and a member 20 pivoted to an adjacent link-pin. The member 20 comprises a spring-controlled arm 21 and a gripper palm 22. The grippers are opened by abutments 24, 25 set in the path of each arm 21. The chains 11, 11<a> are rotated by gearing only during each cycle of operation of the adhesive-applying unit, and the grippers remain at rest while the feed rolls 3 advance the forward end of a wrapper into them. The chains 11, 11<a> are then actuated, and the arms 21 freed from the abutments so that the palms 22 grip the wrapper and press it on the base member 19. The wrapper is then carried to the tabbing device. Tab feeding and affixing mechanism. A disc 42 carries duplicate tab-gripping mechanism for conveying tabs into engagement with the coated wrapper. Plates 43, Fig. 3, are adjustably secured to the disc 42 and form the bearing for a shaft 45 to which is pivoted a member 47 carrying a gripper finger 48 to co-operate with a member 49 for gripping a tab. An arm 51, secured on the shaft 45 carries at one end a spring-controlled roller 52. Gear segments 54 and cams 55 are secured to the disc 42, and cams 56, 57 carried by the frame are adapted to engage the rollers 52 to move the arms 51. Tape w wound on a reel 58 passes over guide rolls to feed rollers 63, 64, the roll 63 being supported on a slide 65, held against spring action by a trigger 66. The roll 64 is intermittently rotated through gearing from the segments 54, and a rod 71 with a pivoted arm 71<a> is reciprocated by the cams 55 engaging a roll 71<b> on the arm 71<a>. The rod 71 rotates a shaft 74 to move an arm 75, Fig. 2, to engage cutting means 76, 77, the means 77 sliding on a plate 78 to sever the tab when the proper length of web has been fed by the roll 64. The -roller 52 then passes beyond the cam 56 and the finger 48 is snapped into engagement with the tab resting on a member 49. The disc 42 then carries the tab to the moving wrapper, the tab being released by the cam 57 engaging the roller 52. Tab-coating mechanism. Discs 93 with grooves 94 receiving the flanged ends of stencils 95 bolted to the discs are rotated through a chain of gears in unison with the disc 42 and glue rolls 90. The stencils engage the glue rolls 90 and carry the adhesive to the tabs on the moving wrapper. Wrapping machine and feed conveyer. The wrapping machine is of the type described in Specification 254,684 in which a reciprocated upper form block 102 carries a box and wrapper into engagement with a lower form block 103, the blocks 102, 103 then carrying the box and wrapper downwardly through the tools which wrap the box. The' block 102 is reciprocated by a cam actuated from a shaft 101 to which is connected a shaft 105. Chains 120, carrying grippers X, feed wrappers beneath the block 102, the chains being intermittently driven by a gear quadrant 112 actuated through gearing from the shaft 105. The grippers X are of the kind described in Specification 254,684 and comprise a plate 126, Fig. 7, carried by adjacent link-pins of the chain, the plate rotably carrying a wheel 127. An arm 128 and palm 129 are carried by a linkpin, the palm 129 being depressed by a cam 130 to receive a coated tabbed wrapper from the grippers V. The wrapper is then gripped between the palms 129 and the wheels 127. In order to effect the timing) of the arm 1 to pass a wrapper from the stack 2 to the rolls 3, a cam 131 driven from the shaft 105 engages a rock-arm 133 linked to pivoted arm 136 which controls tripping mechanism for the arm 1 &c. Specifications 19967/01, [Class 18, Boxes &c.], 4526/13; 249,967 and 264,449, '[both in Class 18, Boxes &c.], also are referred to.