Patent GB-210716-A (GB)
Title: Improvements in machines for manufacturing tubes and other hollow bodies
IPC: D21J3/00
Filed: 1922-07-22
Abstract: 210,716. Marks, E. C. R., (Brown Co.). July 22, 1922. Moulding pulp tubes comprises automatically operated devices for picking up empty mandrels in advance of the winding station and releasing wound mandrels at a point beyond it. The devices comprise pairs of spring-pressed pins 10, Fig. 3, smaller than the recesses in the ends of the mandrels M in which they engage, housed in casings 9 attached to the conveyer 3, bigger than these recesses, to prevent axial movement of the mandrels. The heads 11 of these pins ride in tracks 20 parallel to the tracks 2 in the skeleton side members B of the main frame in which the conveyer 3 moves, the sides of the tracks being cam-shaped to project and retract the pins at the proper intervals to engage and release the mandrels. The side members B are supported by a carriage C, vertically adjustable on the pedestals A of the machine, the upper press-roll b, carried by the carriage C, being thus adjustable relatively to the lower press-rolls a, a<1>, carried by the pedestals A, to adapt the machine for various sizes of pipes. The web of material is fed to the mandrel M at the winding station and when the tube has reached approximately the desired thickness the consequent lift of the carriages 50, on which the upper press-roll b is slidably supported on the carriage C, operates a tripping plate 64, shown diagrammatically in Fig. 12, to press a dog 102, mounted on a slide 101 movable vertically on the main frame, through the medium of the lever 66, into the path of rotation of ratchet teeth 72 carried on the continuously rotating main driving shaft 70. The upward movement of the slide engages, through a bell-crank lever 105 a dog 112, carried by a cam 110 loose on a shaft 107, with a gear 108 driven by a gear 109 from the main shaft 70. The cam 110 lowers a breaker roll 136 to sever the web of material, and keeps it lowered and prevents the web from advancing while the winding of the cut-off portion is being completed. When the breaker roll 136 is lifted, by the continued rotation of the cam 110, a guard 88, holding a dog 86 out of engagement with a ratchet wheel 87 on the main shaft, is moved sideways, by freeing a spring-pressed bar 153 from engagement with a notch on the machine frame by a bell-crank lever 151 operated by the cam 110, to permit rotation of the sleeves 75 with the consequent operation of the cams 78 for lifting the upper press-roll b, and so permits the conveyer to carry forward the wound mandrel and bring into winding position an empty one. The cams 78 lift the racks 81 and tend to press the plungers 54 down into their cylinders 53. The reaction of the pressure of the plungers on the oil in the cylinders causes the carriages 50 to move upwards, carrying with them the press-roll b. The weight of the carriages 50 presses the plungers 54 down into their cylinders to force the oil to flow above the plungers and permit the upper press-roll b to fall gradually to exert pressure on the mandrel at the commencement of winding a new tube. The conveyer is intermittently driven by a sprocket 4, driven through ratchet gearing by a rack 91 attached to a cross-head 89 rotated bv a crank 85 on the sleeves 75. As the crank 85 rotates it trips a lever 161 to re-set the guard 88 and stop the motion, while the tube is being wound, when the sequence of operations is repeated. Empty mandrels are fed to the conveyer on an incline H down which they roll into notches 32 on wheels 30 mounted on a shaft 31 rotated in unison with the conveyer. Overbalanced arms 33 hold the mandrels in the notches and carry them into the path of the moving conveyer when they are engaged by the pins 10. The wound mandrels are discharged to a platform G. Specification 210,715 is referred to.