Patent GB-932682-A (GB)
Title: Method and apparatus for applying tags to bags
IPC: B31B19/60
Filed: 1961-07-21
Abstract: 932,682. Making bags. BEMIS BROS. BAG CO. July 21, 1961 [Aug. 8, 1960], No 26495/61. Class 94(2). In a method of, and apparatus for, applying a tag T to a bag B, Fig. 9, having a single thread unravelable stitch type closure 21 at one end, the stitching being unravelable by pulling one end of the thread, the bags are fed in succession over a table 1, Fig. 1, by two endless chains 5 to means 31 which supply a tab to each bag and to means 157 which adhere the tabs over the said one end of the thread. Each bag is placed on the table with its previously taped and sewn end contiguous to a guide 15, and with the end 25 of the closure tape which includes the said end of the thread rearward; the bags are pushed forward by lugs on the chains, and as each bag approaches the tab supplying and adhering sections it is urged against the guide 15 by an endless belt 17 extending through a slot in the table top. Simultaneously with the feed of the bags a strip S, Fig. 3, of tab material is pulled from a roll R and fed between a pair of feed rollers 45, 53, a pair of rolls 61, 67 which provide transverse lines of perforations in the strip at locations spaced by a distance corresponding to the length of a tab, and feed rolls 75, 77. The tab, which has adhesive on its lower side, is heat sealed to the tape 25 by being supplied to the nip of a driven wheel 135, Figs. 3 and 7, and a lobe part 159 of a vertically movable and rotatably driven sector 157. Since the latter is being driven at a peripheral speed corresponding to that of the bags and the strip S has a considerably lower speed, a portion of the strip is torn off at a transverse line of perforations and pressed on to the end tape. The sector 157 incorporates a heater 161 whereby the tab is adhered to the stitching, and the arrangement is such that a part of the tab projects beyond the end of the tape. A final sealing of the tab is effected by further heated sealing wheels 203, 205 which bear on wheels 131, 133 respectively, and between which the ends of the bags pass. The sealing sector 157, Fig. 6, is thermally insulated from its shaft 153 by a disc 171 of insulating material, and this sector is carried on a yoke 145 pivotally mounted about a shaft 139. An air cylinder 173 may raise the sector away from the wheel 129 to prevent overheating of the bags &c. on shut-down of the apparatus. The heat sealing wheels 203, 205 are mounted on yokes 187, 189 pivoted about a shaft 141 and urged upwardly by air cylinders 219 away from wheels 131 and 133 on shut-down of the apparatus. The heater of the first sealing sector, and those on the wheels 203, 205 are fed electrically by connections extending through their hollow supporting shafts and leading from commutators supplied by brushes. The strip feed rollers and their shafts are supported by spaced transverse plates 33 and 41 and the drive thereto is taken from a main drive shaft 89 via a chain and sprocket drive 95. The heat sealing assembly is carried on a base plate 113 with side plates 115, 117; the shafts of the heat sealing wheels extend through the side plates and the drive thereto is by a drum and sprocket drive 223.