Patent GB-428095-A (GB)
Title: A method of and apparatus for producing closures in a bag tube particularly in producing filled packages
IPC: B65B9/12
Filed: 1933-12-18
Abstract: 428,095. Packeting - machines. ALDRICH, J. P., 628, Lodge Avenue, Toledo, Ohio, U.S.A. Dec. 18, 1933, No. 35627. [Class 94 (i)] Relates to bag making and filling machines of the type in which an elongated tube is formed of flexible sheet material, the outer end is closed and a charge of filling material is inserted, whereupon a closure is formed above the tube to provide a filled package. According to the invention, the bag tube is severed transversely while the walls of the tube are clamped together and the two severed ends are simultaneously folded back against the adjacent wall portions and secured. The material to be packeted is dumped at intervals into a hopper 10, Fig. 1, and passes down a depending tube 11 on an arm 12. Arms 17 carry a mandrel 16 embracing the tube and pass through a vertical slot 19 in the standard 13 to a rod 18 capable of vertical reciprocation of adjustable amount. The sheet material S passes from a roll over guide plates 37 with depending guides which dispose it about the mandrel into tubular formation. The material is held in position by plates 38 yieldingly pressed against the mandrel by springs 39. Where the edges of the material overlap, an adhesive tape 42 is applied and is pressed into position by a roller 43. When the machine is ready to operate, the lower end of the tube B is closed in any suitable manner. Upon downward movement of the mandrel 16 the lower end engages the closed end of the bag tube and moves it downwards, at the same time drawing additional material from the roll S. In order to relieve the strain on the end of the tube, rollers 46 are arranged on arms 50 and are rotatable in one direction only so as to nip the material against the mandrel, operating through slots in the plates 38, in its downward travel, and to move freely upwards. After the bag tube has been lowered through a distance determined by adjusting the vertical travel of the rod 18, the mandrel returns and a charge of material is dumped into the bag tube. Two closures are now simultaneously formed, one to close the top of the charged bag tube, and the other to form a bottom closure for the next succeeding bag. Closure-forming mechanisms are mounted on carriages 61, 62, horizontally reciprocable on rods 59. These comprise a clamping head or jaw 63, Figs. 6 and 13, and a jaw 79, Fig. 13. The head 63 carries a slide 71 adapted to reciprocate in a guideway and carrying a knife blade 74 and a pair of oppositely extending cam surfaces 77. The other head carries a clamping jaw 79 with which are associated a knife 83 and punch 87. A strip of zinc, brass, or tin plate is fed from a roll 100 through a guide 102 forming a lateral extension of the jaw 79 and is positioned in front of the jaw. The jaws approach to the position shown in broken lines in Fig. 13, bellows folds having previously been formed in the tube. The knife 83 moves forward to sever the metallic strip and the slide 71 is traversed to sever the strip longitudinally and also the bag walls at a point midway between the upper and lower edges of the strip. The punch 87 now advances as shown in Fig. 19 and turns the severed strip and bag portions T<1>, T<2> through a right angle. The shuttle now makes a traverse in the reverse direction and causes the parts T<1>, T<2> to be bent back as shown in Fig. 21, whereupon the punch 67 moves to the right and clamps the strip in position, knobs 130 and grooves 131 assisting the action. The clamps are retracted and the machine is ready for another cycle of operations. In a modification, Fig. 30, a cutting and folding plunger 134 is mounted in the jaw 79<1> to co-operate with a recess 681 in the jaw 63<1> shoulders 136 effecting the initial bending of the strip. A shuttle 71<a> then completes the bending.