Patent GB-410785-A (GB)
Title: Improvements in method and means for renewing webs of printing and other machines
IPC: B65H19/18
Filed: 1932-11-18
Abstract: 410,785. Feeding webs. HOE & CO., Ltd., R., 109, Borough Road, London.- (Assignees of Tomlin, J. R., and Lundquist, A. ; 138th Street, New York, U.S.A.) Nov. 18, 1932, No. 32688. Convention date, Dec. 1, 1931. [Class 100 (i).] In a web-renewing mechanism for printing and other machines, means are provided at one or both ends of the new roll, and rotatable therewith, for holding the free end of the web to the body thereof while the roll rotates, means being provided to free the web from the holding means when the running web and the new roll are brought together to effect the join. The running roll 21 and the new roll 19, Fig. 1, are mounted on a rotatable frame 18, and at each end of the roll 19 and freely mounted on the roll-holding spindle is a member B for holding the end of the web against the body of the roll. One form of this member B comprises two straps 23, 24, Fig. 3, adjustably connected together by bolts 26 and slots 25, the strap 24 terminating in a head 29 having a jaw 31 and a knife 34 mounted on a pivot 35 and adapted to move through slots 36, 37 in the head. A spring normally holds the knife in an inoperative position. Each member B is supported so as to rotate with the roll by a strip of paper &c. 55, secured to the body of the roll and, after passing through the jaw 31, secured to the head 29 by a milled roller 57 slidably mounted in slots 59 and adapted to clamp the strip 55 against a surface on the head inclined to the direction of the slots 59. Strips 32, 33 are secured in inclined relation to the end of the web of the roll, the portion of the end of the web between the strips is torn away, and the ends of the strips passed through the jaws 31 and secured to the heads 29 by clamping-rollers 57 similar to that clamping the strip 55. Adhesive is applied to the outer surface of the strips 32, 33. The new roll thus prepared is rotated at substantially the same surface speed as the web W by means of a belt 65 driven by gearing from the printing &c. machine. The running web W is then pressed against the new roll to effect the join by brushes 51 carried by frames 44 secured to a shaft 46 provided with an operating handle 63. At about the same time as the web is pressed against the adhesive strips 32, 33, the knives 34 contact with abutments 42 on the brush frames, causing them to move across the jaws 31 and sever the strips 32, 33, 55, thus freeing the new web. The members B then drop to an inoperative position and the old web is severed in any suitable manner. In a modification of the member B, Fig. 10, the head 29 is provided with an offset projection 99 and a single strip 103 serves both for supporting the member and for holding the free end of the web, the strip being preferably first secured to the body of the roll and then passed through the jaw 31 and round the projection 99, then again passing through the jaw and being secured to the free end of the web. In a further modification, Fig. 12, a single strip 106 is secured to the free end of the web and is weakened as by perforations 107 adjacent the periphery of the roll. The free end of the strip is secured by a clamping-roller 112, similar to the rollers 57 of Fig. 3, to a carriage 109 slidable in guides 116 on a member 117 rotatable on the roll spindle 138. A pinion 119 on the member 117 engages with a rack 118 on the carriage 109 and with a segment 122 secured to a member 124 having an arm 125 adapted to engage a pin 126 on an arm 127 carried by the brush frame. The member 117 is clamped to the spindle 138 so as to rotate therewith by means of a clutch band 137 secured at one end to a pin 143 on the member 117 and at the other end to a plate 131 pivoted on the pin 143 and having a slot 132 engaged by a pin 133 on the carriage 109. A spring 129 normally holds the arm 125 against a stop 128 on the member 117. When, during the rotation of the roll 19, the arm 125 engages the stop 126, the member 124 is arrested and the continued rotation of the member 117 causes, through the segment 122, pinion 119, and rack 118, sliding movement of the carriage 109 to pull the strip 106 and sever it at the perforations 107. Further sliding movement of the carriage causes the pin 133 to turn the plate 131 to release the clutch band 137 and disconnect the member 117 from the spindle 138.