Improvements in or relating to web supply reel for printing presses

摘要

716,938. Feeding webs. GOSS PRINTING PRESS CO. Aug. 18, 1952, No. 20739/52. Class 100 (1) A web supply reel assembly for printing presses comprises a supporting horizontal shaft, a pair of radially extending supporting arms mounted on the shaft to support between them at their outer ends a paper roll, means for applying torque to one end of the shaft to index it and move the arms from a loading position to a feeding position wherein the roll will be offset from the vertical plane through the shaft axis, means for securing one of the arms to the shaft against turning movement relative thereto, and means whereby the other arm will be capable of limited angular reflection relatively to the shaft so that torsional deformation of the latter will be compensated and the roll be maintained substantially horizontal. A central shaft 10 supports two spiders 18, 20, each comprising three arms 22 extending radially and angularly spaced at 120 degrees. Each pair of arms 22 supports a spindle 26 carrying a web roll P. The shaft is indexed through 120 degrees by means of a gear 28 when desired, so as to bring each roll successively from loading position to reserve and feeding positions, and since the gear 28 is driven by a small pinion, it acts to absorb the torque due to the weight of the rol!s. The weight of the rolls causes a torque in the shaft 4 between the spiders which causes a slight drop in the left hand end of the roll P in feeding position. The spider 20 is secured to the shaft by means of a hub into a series of bores in which are inserted set screws to engage opposite sides of a key extending along the shaft and accommodated in a keyway in the hub. In order to compensate for the drop of the end of the roll and to keep it substantially horizontal, the spider 18 is formed with a wider keyway to allow slight relative angular motion relative to the shaft. A torque collar 38 having a flange 40, is secured to the shaft, and an elastic torque-transmitting sleeve member 42 is bolted to the flange 40 and to the hub 56 of the spider 19. The member 42 is formed with a series of slots 64 to render it elastic. The arrangement is such that the horizontal arm 22 of the spider 18 drops to compensate for the drop of the corresponding arm 22 of the spider 20 Exact compensation occurs with a paper width of 56 inches, with undercompensation for longer rolls and over-compensation for shorter ones. In another form the spider 18 is secured to the shaft by means of set screws, and the arms 22 of the spider 18 are formed thinner than those of the spider 20, whereby the former have a torsional compliance causing a similar compensation.