Patent GB-600894-A (GB)
Title: Improvements in or relating to web renewing mechanism for printing or other machines
IPC: B65H19/18
Filed: 1945-12-06
Abstract: 600,894. Feeding webs. WOOD NEWSPAPER MACHINERY CORPORATION. Dec. 6, 1945, No. 33048. Convention date, Feb. 6. [Class 100(i)] Web-renewing apparatus for printing or other machines comprises a new web roll mounted with an element of its cylindrical surface substantially parallel to a web running from another roll, and a driving connection simultaneously engaging the surfaces of the new roll and the running web for accelerating the new roll to the speed of the running web. Paper rolls 21, 22, Fig. 1, are carried by reel arms 14 mounted on a shaft 16 which is rotatable by means of a worm wheel 23, a worm 24 and hand wheels 27. In the normal running position the roll is tensioned by belts 28 passing over idler pulleys 30, 31, 32, 33, 35, driven pulleys 34 and idler pulleys 36 acted on by adjustable weights 39. The running web 46 passes over rollers 48, 49, 50, the roller 48 being mounted on a shaft 54 carrying bellcranks 53 between which extend a shaft 52 carrying two narrow traction rollers 51. These rollers 51 are driven by the roller 48, either frictionally as shown or through gearing, and, when the reel is rotated to bring the new roll 21 to a position in which it is just out of contact with the running web, they engage the new roll to accelerate it to the running web-speed. Springs 55 urge the rollers 51 towards the roll, stops 56 on the bell-cranks 53 engaging projections 57 to limit this movement. Shafts 68, 71, Fig. 10, mounted in the reel arms 14 carry knives 66, 67 which extend continuously transversely of the machine and are urged outwardly from the reel axis 16 by tension springs. Cams 77, 78 fixed to the shafts 68, 71 are adapted to be latched by the armatures 79, 80 of solenoids 81, 82 to hold the knives in the retracted position. One terminal of each solenoid is connected to a slip ring 83 and the other terminals are connected to slip ring segments 84, 85. Brushes 86, 87 contacting these slip rings are connected to a relay 90 so that when the relay is actuated the solenoid of the knife adjacent the running web is energised and the knife is released. The shafts 68, 71 carry levers 74, 75 one of which is engaged by a stop as the reel is rotated to retract the knife which has been released. As shown in Fig. 11, the knives sever the web at the place where the belts 28 are deflected by the pulleys 31, 32, 33. The shafts 68, 71 also carry cams 107, 1071 each of which is contacted by a roller 106 carried by an arm 105 pivoted at 102 and linked at 103 to an arm 99 pivoted at 101. The arms 99, 105 are connected by a spring 104 and carry brake shoes 97, 98 adapted to engage a brake drum on the web roll spindle. The cam 107 is so shaped that the brake is applied when the knife is released. The leading end of the new roll is held to the roll surface by means of a tab of the form described in Specification 594,632, carrying a patch of electrically conductive material on its under surface. Tacky adhesive is applied to the leading end of the new web, and when a splice is to be made, the reel is rotated to bring the new roll 21 into contact with the running web, Fig. 11. As the conducting patch of the tab passes brushes 142, Fig. 10, it closes a circuit which energises the relay 90, thereby releasing the knife 66 to sever the old web. A switch 155 provides a manual control for severing the web. Instead of running belts 28, stationary belts carrying adjustable weights may be provided. In a modification, the linkage operating each pair of brake shoes is connected to the armature of a solenoid, and a cam on the knife shaft closes a switch when the knife is released, to actuate the solenoid and apply the brake. Specification 600,899 also is referred to.