GB1138222A - Improvements in or relating to web-splicing rollstands - Google Patents

Abstract

1,138,222. Feeding webs. W. F. HUCK. 5 Sept., 1966 [7 Sept., 1965], No. 39588/66. Heading B6B. In apparatus for splicing a web from a replacement roll to a web from an expiring roll, means are provided for pressing the old web against the periphery of the new roll to achieve splicing, which means move at substantially the same speed as the web. During normal running, a web W is fed from a roll Ia situated at position R on one arm of a spider frame 13, and a replacement roll Ib is situated at position L on another arm of the spider. The web W is driven by a number of side-by-side endless belts 19 passing around pulleys on a driven shaft 17 and maintained at a desired tension by a roller 22 carried by the piston of a fluidpressure cylinder 26. A shaft 16, driven from a printing or other machine to which the web is to be fed, is coupled to the shaft 17 by a variable-speed drive controlled by a floating roller 15 around which the web passes, so as to control the web tension. When the roll Ia is nearly exhausted, the spider 13 is rotated so that the expiring roll moves to position E and the new roll Ib moves to position 5. In the latter position, a pivoted frame 31 carrying belts 28 driven from the shaft 17 is moved by means of a fluid-pressure cylinder 39 to bring the belts 28 into contact with the roll Ib to rotate the roll at a peripheral speed equal to the linear speed of the web W. Adhesive has previously been applied to the periphery of the new roll and the pressing means is now brought into operation. The pressing means comprise a number of arms 41 mounted on a shaft 42 and movable towards and away from the roll Ib by a fluid pressure cylinder 78. The arms 41 are forked at their lower ends and each carries a shaft 43, Fig. 3. Pivoted on the shafts 43 are levers 44 carrying rollers 47 of soft rubber, there being one roller 47 for engaging each belt 19. The levers 44 are normally held against the action of springs 55, in the full line position, Fig. 3, by latches 49 which can be released by the operation of a fluid-pressure cylinder rotating a shaft 62 connected by arms 61 and cables 54 to the latches. Also pivotally mounted on the arms 41 are brackets 58 carrying knives 59, the brackets 58 being held in the full line position, Fig. 3, against spring action, by latches releasable by mechanism similar to that employed for latches 49. When pressing and splicing is to be effected, the arms 41 are moved from position 40<SP>1</SP>, Fig. 1, to position 40, Figs. 1, 3. In the latter position, the rollers 47 engage the belts 19 and are driven thereby. Each roller 47 has a circumferential groove which just accommodates its belt 19. The latches 49 are now released, so that the rollers 47 move into the dotted line position 47<SP>1</SP>, Fig. 3, so as to press the old web against the new web over practically the whole width of the webs to effect splicing. The soft surface of the rollers 47 and the fact that they are carried by separate levers 44, allow the rollers to accommodate themselves to irregularities in the roll surface. Subsequently the knife latches are released, so that the knives 59 under spring action sever the old web. The arms 41 are now moved back to their inoperative position 40<SP>1</SP> during which movement fixed cams reset the latches 49 &c. Also, the spider is indexed to bring the new roll into position R.