Patent GB-318902-A (GB)
Title: Improvements in means for connecting rolls of paper webbing in printing presses
IPC: B65H19/18
Filed: 1928-03-12
Abstract: 318,902. Johancen, T., and Kehoe, E. March 12, 1928. Feeding webs.- In a web-renewing mechanism for printing presses the active roll, when near exhaustion, is raised from the normal running bearings while the web is still being fed, a new roll is placed in the bearings, the old web is pressed against the new roll to cause it to rotate and to effect the join, and the old web is then severed by a cutter actuated by the rotation of the new roll. Raising nearly exhausted roll. On each side frame 20, Fig. 8, the machine is arranged a vertically slidable rack-bar 52 to which are pivoted pairs of hooked members 62, one pair for each deck, the upper ends of the members 62 being connected to the frames 20 by links 68, 69. These members 62 are normally held in an inoperative position by latches 66, but when the web 46 is nearly exhausted, the latches are released to allow springs 67 to throw the. members 62 forward into the position shown in broken lines. The rack-bars 52, which are connected together for simultaneous movement by gears 59, 60 and a cross shaft 61, are then raised by admitting air to a, pneumatic cylinder connected to one of the rack-bars, and the members 62 are thus caused to engage the spindle 47 of the roll and raise it to the position 85, Fig. 11. Inserting new roll. The new roll 46, Fig. 11, is mounted on open bearings on wheeled carriages 35 supported on rails 23 carried by brackets 21. The carriages are connected by cables 37 to a pneumatic cylinder and upon the admission of air to the cylinder the carriages are drawn forward until they run down the inclined ends 26 of the rails 23 and deposit the roll spindle in the normal running bearings 28. The rails 23 are slidable upon the brackets 21 and are connected by slotted pivoted arms 31 and links 30 to pivoted end members 29 of the brackets 21 so that upon raising the members 29 the rails 23 are moved inwardly and do not obstruct the raising of new rolls to upper decks of the press. Attaching old web to new roll. The new roll is inserted in the press with its leading end 71, Fig. 11, to the rear of the vertical plane through the axis of the roll and paste 72 is applied to the roll. A roller 89 mounted on hand-levers 88 is then operated to press the expiring web 90 into contact with the new roll to cause the roll to rotate and to join the webs. Sevening old web. A collar 50, Fig. 11, having a radially projecting pin 51, is secured to the roll spindle 47 so that the pin is to the rear of the leading end of the web and. after the join is effected, rocks a lever 94 about its pivot 96. The other end 95 of the lever is connected to a rod 97 freely guided in a keeper plate 98 and having a hooked end 99 engaging a pin 105 on an arm 104 fixed to a shaft 103. This shaft is connected by a chain 117 to a shaft 114 supported in the arms 110 of bell-crank levers, the other arms 111 of which engage the cross shaft 61. The shaft 114 carries a cutter 115. When the lever 94 is actuated by the pin 51, the rod 97 is drawn forwards and actuates the shaft 114 through the arm 104 and chain 117, to cause the cutter to turn and sever the web 90. Towards the end of the movement of the rod 97 a projection 100 upon it engages a cam 101 to free the hook 99 from the arm 104 and allow a weight 106 to return the shaft 103 and cutter 115 to normal position. Web-roll brakes. Both ends of the roll spindle are provided with grooved brake pulleys. That at one end co-operates with brake devices of ordinary form mounted on the press frame to control the web tension while the roll is in the normal running position. When the roll is to be raised, this brake is disconnected and the brake pulley on the other end of the spindle is engaged by brake bands 83, Fig. 14 pivoted to a carriage 82 movable on rods 80 carried by a head 79 mounted on a threaded shaft 77. This mounting of the brake allows the brake to remain in engagement with the spindle 47 while it is being raised by the members 62.