Patent GB-770092-A (GB)
Title: Improvements in or relating to the manufacture of bags
Inventor: STEEN HARFORD KIRK
IPC: B31B19/86
Filed: 1955-05-05
Abstract: 770,092. Making carrier bags. INTERSTATE BAG CO. May 5, 1955, No. 13091/55 Class 94(2). A handled bag is formed by gluing areas on a sheet forming one side wall, attaching a doubled handle strip to the sheet and superimposing and securing a second sheet on the handle and first sheet. The second sheet may have folded margins forming gussets and is cut shorter than the first sheet to produce a bottom glue lap. The bag is formed on a machine comprising a continuously rotating drum 77 to which the bag elements are held during assembly. The first sheet 10 is cut by a knife on a roller 72 from a web 11, the web having passed through printing means 69, and is attached to the drum 77 by grippers 78 and pins 79. A glue wheel 76 applies areas of adhesive 12 and 13. The handle 14 is cut from a web 25 by a cutter 41, the web having previously passed through a folder 30 for folding over each edge to produce a reinforcement. It is gripped between drums 85 and 86 and engaged by a spike 87 on the drum 86. It follows the periphery of the drum 86 until a blade 89 tucks its midpoint into a recess 90 in the drum 85. The tucked portion is held by a gripper 91, the spike 87 is withdrawn, and the handle now doubled, follows the drum 85. Creasing ribs 101 on the drum 86 form creases 19 during the doubling process to enable the handle to fold within the mouth of the finished bag. When the handle enters the bight of the drums 77, 85, it is gripped by a spike 100 and one end is superposed on the adhesive area 13. The second sheet 15 is cut from a web by a cutting roller 103 and fed to a folder B, Fig. IB, comprising plates 54, 55 between which the margins are turned inwardly by plates 56, 57, to produce gusset folds 16, the extreme margins 63 of the folds being turned over onto the plate 54 by sweeps 60. A glueing device 66 applies an area of adhesive 17 and the sheet is fed onto the drum 77, the grippers 78 having been momentarily raised to receive the leading edge. The sheet 15 is now superposed on the handle and the sheet 10, the free end of the handle lying on the adhesive area 17 and the margins of the sheet 15 contacting the adhesive area 12. The spike 100 assists in locating the sheet 15. At the bag bottom, the sheet 10 extends beyond the sheet 15 to produce the glue lap. A blade 114 on a drum 107 tucks a portion of the bag adjacent the bottom into a recess 111 in the drum 77, where it is gripped by an element 110. Fingers 120 complete the folding over of the bottom. A creasing blade 123 on the drum 107 creases the bag adjacent the bottom to facilitate correct disposition of the gussets when the bag is opened in use. The completed bag is removed from the drum 77 by a stripper 131, the clamps 78 and element 110 being opened and the pins 79 withdrawn, and delivered from the machine by belts 132, 135. To ensure synchronization, all drums and rollers except those comprising in the glueing device 66 and rollers 133, 134, 136 and drum 137 of the delivery means are geared to one another either directly or by idler gears and driven from a main shaft 104 S, Fig. 1. The device 66 is chain driven from this shaft.