Patent GB-324021-A (GB)
Title: Improvements in web replenishing apparatus for printing presses and other machines
IPC: B65H19/18
Filed: 1928-10-13
Abstract: 324,021. Marks, Sir G. C., (Wood Newspaper Machinery Corporation). Oct. 13, 1928. Feeding webs.-In a. mechanism for replenishing the web of a printing or other machine without reducing the speed of the web, the active and reserve rolls are mounted on a support which is rotatable into a position wherein the relative positions of the 'rolls are such that the bodily movement of the running web necessary to bring it into engagement with the new roll is effected solely by the change in the web path consequent on the reduction in size of the old web as it expires. The active roll A and reserve rolls B, C, are supported by frames 17 carried by a shaft 12 mounted in supports 11 and rotatable by hand or by an electric motor to bring the rolls in succession into the feeding position in which they are engaged by a pair of feeding belts 30 passing round lower drums 32 and upper drums 31 mounted on a shaft 33 driven from the printing press. As the active roll nears exhaustion, the web moves towards the reserve roll B but is prevented from making actual contact with that roll until it is desired to make the splice, by means of a shield 42 carried by a pair of arms 41 pivoted to the supports 11. The arms are connected by links 40 to arms 43 fixed on a rock shaft 43 to which is also fixed an arm 45 connected to a spring rod 47 tending to turn the shaft 43 in an anti-clockwise direction but normally held inactive by a pivoted latch 53 engaging a toothed collar 55 on the shaft 43. To the shaft 43 is also fixed an arm 80 having a stud 82 engaging a closed slot in a link 83 pivoted to one of three arms 38 fixed on a shaft 33a and carrying rubber-faced rollers 39 driven by chains 29 from the shaft 33. To the latch 53 is pivoted a rod 68, Figs. 1 and 4, passing freely through an eye 69 on the end of a spring rod 70 mounted in one of the supports 11 and normally holding the rod 68 laterally out of the path of a pivoted arm 74 oscillated vertically by a cam 66 on one of the spindles 20 supporting the roll B. This spindle, which is freely rotatable in the support 11, is positively conr.ected to the core 21 of the roll by a key projection 22 engaging a slot in the core. A knife 90, Fig. 1, for severing the old web on its core is carried by a lever 91 bearing a weight 92 tending to raise the knife. Normally a spring latch operated by a head 95 engages beneath the lever 91 to hold the knife in the fully depressed position shown, but just before it is desired to effect a splice the latch is pulled out to allow the lever 91 to rise into an intermediate position in contact with a rod 93 pivoted to one of the arms 41 and guided through an eye 94. The roll B is prepared by attaching the end of the web by grease to the body of the roll and applying patches of paste to the end of the web, the position of the end of the web being radially opposite the cam 66. Fig. 1 shows in full lines the position of the parts just prior to making the splice, the old web being held clear of the roll B by the shield 42 and the roll B rotating at the same surface speed as the old web. Upon pressing in the rod, the rod 68 is moved into the path of the arm 74 and is raised thereby to lift the latch 53 clear of the collar 55. The shaft 43 is then turned by the spring rod 47 to raise the shield 42 into the position shown in dotted lines and allow the old web to make contact with the roll B. At the same time the stud 82 on the arm 80 engages the end of the slot in the link 83 and raises the rollers 39 clear of the roll. When the pasted end of the new web engages the old web the join is automatically effected and owing to the lifting of the rod 93 with the shield 42, the knife rises into contact with the old web roll and severs the web. The frames 17 are then turned to bring the roll B into the normal running position. The parts are reset by a hand-lever 59 loose on the shaft 43 and carrying a spring bolt adapted to be inserted in a hole in a collar fixed' on the shaft.