GB572315A - An improved packaging machine - Google Patents

Abstract

572,315. Packeting tea &c. FUERY, G. T. (Millie Patent Holding Co., Inc.). Sept. 9, 1943, No. 14770. [Class 94 (i)] In a machine for forming flat packets, such as packets of tea in a form suitable for infusion, a web of porous material, such as filter paper, coated with a heat-setting adhesive is folded longitudinally into troughshape by a former, and is temporarily formed into bay-sections by travelling grippers, which engage the web transversely, so that the mouths of the bag-sections surround travelling filling-members, by which charges of tea are delivered, the bag-sections being then permanently heat-sealed at the top and sides, after which the web is cut into individual bags. The filled bags are deposited on a conveyer in groups of predetermined numbers. The paper web 41, Fig. 1, is drawn from a roll R through a former 42, and is gripped transversely by pairs of U-shaped jaws 43 carried on an endless travelling chain 43c. The jaws are closed on the web against spring action by stationary cams 43r, Fig. 4, so as to form temporary bagsections, the mouths of which are wrapped about filling-spouts 52, which, in known manner, supply uniform quantities of tea. The spouts are carried by an endless travelling chain, so as to move in synchronism with the paper web, and are raised and lowered by stationary cams 53b. After the spouts are withdrawn, the mouths of the bag - sections are temporarily closed by reciprocating presser-fingers 55, Fig. 18, after which the mouths are heatsealed by gripping between heated dies 56a, Fig. 4. At the next stage in their travel, the sides of the bag-sectons are permanently closed by heated gripping-jaws, after which the individual bags are severed by shears. The closing-fingers, sealing-members, and shears are carried on slides, which are reciprocated longitudinally of the web, so as to travel therewith in one direction. The filled bags are removed from the gripper-chain 43c by a rotating wheel 60a, Fig. 22, against the edge of which they are gripped by cam-actuated jaws 60k. The bags are released at the opposite side of the wheel and fall upon a travelling belt 61a, which is intermittently driven through a ratchetdevice, so that the bags M are deposited in separated groups. A stationary cam 62 guides the bags into position as they fall. The machine may be designed to operate on two or more bag-sections simultaneously.