Patent GB-654510-A (GB)
Title: Improvements in apparatus for producing filled bags
IPC: B65B29/04
Filed: 1948-12-14
Abstract: 654,510. Tea bags. PNEUMATIC SCALE CORPORATION, Ltd. Dec. 14, 1948, No. 32340. [Class 94(i)] [Also in Groups XXIV and XXX] Apparatus has the combination with means for supporting a filled and sealed bag having a handle comprising a tag and a length of twine looped about the bag and its support, of means for withdrawing a completed bag from its support, and means for releasing the loop from the support prior to the withdrawing operation. Filled and sealed tea bags 10 from bag making and filling means 13 are received, in successive gripper units 22 carried by an endless chain 24 intermittently operated in timed relation to the bag making mechanism by pawl and ratchet type mechanism 500. Each gripper unit 22 comprises two pairs of co-operating jaws 30, 32 pivotally mounted on a rectangular hub 34 secured to a shaft 36 journalled in the carrier chain 24 and normally closed by a spring 42 and opened by pressure on abutments 44 formed on the jaws. At a bag receiving station 46 the jaws are opened, and closed on the bag, by a cam operated arm 48. On its way from the station 46 to a station 76 the gripper unit is rotated from a vertical to a horizontal position by the engagement of a gear 102 fast on the shaft 36 with a stationary rack 100, pawl and ratchet mechanism holding it in its new rotated position. At the station 76 twine 14 extending from the previous bag, Fig. 4, across the gripper unit 22 into which it is to be inserted and slotted guide 127 to twine controlling mechanism 82, is pushed under an open spring arm 136 on a jaw 30 by a cam operated finger 138 whereupon the arm 136 is permitted to close to hold the twine against the jaw. The twine is then severed at 370 from that around the preceding bag, pulled back a little so that an end 8 is near the arm 136 and has a tag 84 stapled thereto. The gripper unit is then advanced and rotated 360 degrees by engagement of the gear 102 with a stationary rack 318 to wind the twine about the bag and its supporting grippers. One of the jaws 30 is formed with an extension 104, Fig. 5, having an opening 106, to act as a support for the bag so that the twine may be stapled thereto, at 92, Fig. 5, being severed at 370 as before described. At a station 96 the bag is withdrawn from the gripper and discharged by mechanism which includes a bar 375, reciprocated by a cam, having an extension 374 adapted to engage abutments 44 on one side of the gripper jaws to slightly open the gripper. and a second bar 376, also reciprocated by a cam, having a jaw 388 pivoted thereto and adapted to co-operate with the jaw 376 to grasp the bag and then, after further opening of the jaws and the spring arm 136 by further movement of the bar 375, withdraw the bag from the jaws to a guide shoot 398. A loop 6, of the twine is drawn off one end of the jaws 32 at a station 90 preceding the withdrawing station 96 by a bar 400 having a hooked part 401 and carried by a tie piece 403 extending from the bar 376. The whole mechanism described is duplicated to operate on bags carried by grippers 22 extending from the other side of the chain 24. Specification 600,860 is referred to.