Patent GB-698479-A (GB)
Title: Improvements in or relating to mechanism for inserting a sleeve in a bag valve
Inventor: PETERS HARRY
IPC: B31B19/84
Filed: 1951-10-10
Abstract: 698,479. Making paper bags. RAYMOND BAG CO. Oct. 10, 1951, No. 23574/51. Class 94(ii) . The invention relates to an arrangement for mechanically inserting a sleeve in the valve of a bag after the valve has been folded. Fig. 1 shows a plan view of the machine, the bags 24b with previously formed valves, being transferred by rollers 21 to a conveyer comprising parallel chains 22 each provided with lugs 24a to engage and advance the bags. The conveyer is driven through the shaft 24 from a main shaft 25 extending along the main frame 20. The sleeve forming and inserting mechanism is supported on frames 28, 29, on the main frame 20, and the sleeve material is supplied from a roll 34 of thin strip paper 35, the roll being mounted on bars 34a on the main frame, Fig. 3. To.provide a finger piece which may be gripped by the operator to open the sleeve for the insertion of a filling spout, one edge portion 57 of the strip is removed, Fig. 13, so that when folded to form the sleeve, Fig. 16, one end portion of the sleeve will project beyond the other. The web 35 is carried from the roll 34 around guide rolls 36, 37, to a cutting device comprising a non-rotatable disc 40 carrying the fixed cutter bar, and a rotatable disc 42 carrying the movable cutter bar to form slits 44, Fig. 13, in the edge portion of the web, rotatable cutters 54, 55, co-operating to form the tapered recesses 57 in the edge of the web. After leaving the cutters 54, 55, the strip passes round a grooved roller 69, Fig. 3a, which is rotatably mounted on arms 70, and co-operates with an adjustable scoring disc 73 to score the web adjacent the unrecessed edge, and the web then moves to a folding device 79 which folds the edge portion 35a, Fig. 13, on the score line. The web then passes over a guide roller 82 and a spring-biased roller 83, Figs. 3 and 5, which co-operates with the two paste applying discs 81 to apply paste to the folded over edge portion of the strip 35. The discs are provided with aligned notches 81a to prevent application of the paste to portions which are to be engaged by a severing device. Feed rollers 30, 31, move the strip to rollers 86, 87, which are provided with co-operating scoring devices comprising a blade 90 and recessed block 91, and severing devices comprising cutters 92, 93, the strip being transversely scored in the centre of a section, to be severed. The strip is maintained taut during the scoring and severing operation by co-operating rotary segments 94, 95, which release the strip at the instant the end portion is severed, the severed portion being gripped between rotary segments 99, 100 and carried downward and released when the transverse score line is in the path of the inserting element 96. The element 96 folds the severed section into sleeve form and moves the folded sleeve into the bag. Rods 190 carrying resilient fingers 191 may be arranged above and below the path of the element 96 to ensure proper folding. The shaft 63, which drives the feed rollers and cutting and scoring devices, is driven from the main shaft 25 through gears 64, shaft 65, and gears 66, 67, 68. A hand wheel 175 enables the feeding and forming mechanism to be manually operated for threading in and properly timing a new web. For opening the bag valve an arm 127 is mounted on a shaft 128 and a crank 129 is pivotally mounted at the free end of the arm 127. A finger or plate 131 is pivoted to the arm 130 of the bell crank, the other arm 132 having a stud 132a which travels in a cam slot 133 in the frame. A cam 134 engages a roller 135 on an arm 127a secured to the shaft 128 and moves the arm 127 against a spring 135a, to carry the finger 131 into the space between the upper and lower side walls of the bag, the outward movement of the bell crank moving the stud 132a in the slot to move the finger 131 upwardly and cause it to engage and lift the upper side wall of the bag and at the same time open the bag valve. After the sleeve has been inserted the members return to their initial positions. The element 96, Figs. 6 and 7, comprises a plate having a wide forward end portion 137 and narrow portion 138 mounted on an arm 144, a thin blade 140 being yieldably retained in a slot 139 in the portion 137 by springs 142. The element 96 inserts the sleeve in the valve while the bag is being moved towards the sewing heads and is mounted for movement in a circuitous path. The arm 144 is pivotally mounted at 145 on a plate 146 which is slidably mounted in a guide member 147 below and extending transversely to the path of movement of the conveyer, and a stud 149 attached to the arm 144 extends through an arcuate slot in the plate 146 and into a cam slot 148 in the guide member 147. The plate 146 is rigidly connected to a plate 151 slidably mounted in a guide member 152 parallel to the movement of the conveyer. A rod 153 connects the plate 146 with an arm 154 which is pivotally mounted at 155, and a toothed segment 156 which is attached to the arm 154 and rotatably mounted on the shaft 155 co-operates with a corresponding segment 157 on an arm 158 pivotally mounted at 159. The arm 158 is actuated by a cam 160 on a shaft 161 which engages a roller 162 on the arm and this causes the arm 154 to move about its axis against the action of a spring 163 to move the plate 146 and the inserting element 96 in a direction transverse to the path of the conveyer. The plate 151 is moved against the action of a spring 167 in a direction parallel with the conveyer by an arm 164 pivotally mounted on the shaft 155 and carrying a roller 166 co-operating with a cam 165 on the shaft 161. These two movements imparted to the plates in timed relation, combined with the pivoted movement imparted by the cam slot 148 move: the inserting element in the required path. The shaft 161 is driven from the main shaft 25 through shaft 65. If any bag receiving section of the conveyer does not carry a bag as it approaches the inserting mechanism the operation of the strip feeding mechanism is interrupted by means of a clutch 169 interposed between two parts of the shaft 65. The clutch, Fig. 17, comprises a driving disc 170 secured to one part of the shaft 65 and having a shoulder 171 forming a ratchet tooth, and a driven disc 172 which carries a spring-loaded pawl 173 normally in engagement with the shoulder 171. The pawl extends laterally beyond the driving disc and may be disengaged from the driving disc by means of a rotatable cam 176 which when actuated by a link 178 causes a trip element 175 to lift the pawl. The link 178 is connected through a linkage to a spring-loaded arm which extends forward between the conveyer chains 22 and is normally held in a horizontal position by the weight of the bag moving over the arm, Fig. 2 (not shown), if there is no bag in that section the arm moving upwardly to actuate the cam 176. Fig. 16 shows the valve corner of a bag with the sleeve in position prior to sewing. The valve 193 has been folded in and the sleeve 194 is seated in the V- shaped fold of the valve with its cuff portion 195 pasted to the inner surfaces of the side wall of the valve. The cuff portion is the folded-over edge portion 35a, and the sleeve is of the tuck-in type.