Patent GB-130532-A (GB)
Title: Improvements in or relating to Web-renewing Mechanisms for Printing Presses.
IPC: B65H19/18
Filed: 1918-12-02
Abstract: 130,532. Goss Printing Press Co., (Goss Printing Press Co.). Dec. 2, 1918. Feeding and registering webs.-A web-renewing mechanism for a printing-press comprises supporting means for two web-rolls from which the webs are fed alternately without shifting either roll, means for rotating either roll at the same surface speed as that of the web in use and means for pressing the web in use against the other roll for joining the expiring web to the leading end of the other roll. The rolls are provided with braking and transverse registering devices and operating mechanisms for these devices are provided adapted to be connected adternatively with the devices of each roll. In one form, Fig. 1, the two web-rolls 102, 104 are mounted in a frame 25 beneath the press room. Roll-rotating belts 64, 74 are arranged adjacent to the rolls and are constantly driven but normally out of contact with the rolls. The belts 64 pass round a pulley 62 on a shaft 56 driven by bevel gears from a press-driven shaft 55 and round a pulley 63 on a shaft 61 carried by arms 60 adjustably carried by sectors 59 loose on the shaft 56 and gearing with sectors 66 secured to a shaft 65 provided with an operating handle 67. The belts 74 are similarly mounted and are controlled by a shaft 77 corresponding to the shaft 65 and connected to it by arms 80, 79 and link 81. By depressing the handle 67 the belts 74 are moved into contact with the roll 104 and by lifting the lever the belts 64 are moved into contact with the roll 102. The running web passes over a roller 85 loose upon a vertically slidable shaft 82 which is normally pressed downwards by springs 84 and is connected by rods 97 to a pedal 100. The shaft 82 is provided with arms 86 carrying a roller 88 and is connected by gearing 89, 90 and link 92 to a pedal 91 which is held upwards by a spring 95 so that the arms 86 are normally in the position shown in Fig. 3 relatively to the roller 85. The new roll is prepared by lightly attaching the end of the web to the body of the roll and applying patches of paste near the leading edge. When the upper roll 102 is nearly exhausted the handle 67 is depressed to rotate the new roll 104 and the pedal 91 is depressed as shown in Fig. 1 cause the roller 88 to press the expiring web into contact with the roll 104. The old web is then severed by a knife 107 pivoted by the arms 86 and operated by a cord and pulley 108, 109. When the lower roll 104 is nearly exhausted a new prepared upper roll 111, Fig. 3, is placed in the machine and rotated by an upward movement of the lever 67. The pedal 100 is then depressed to raise the roller 85 as shown in Fig. 3 and press the web into contact with the roll 111. The old web is then severed by a knife 113 pivoted in the frame 25 and operated by a cord 115. The rolls are provided with brake shoes 32, 33 operated by bolts 34 and nuts 36. Screws 38 are also provided to adjust the rolls laterally. The nuts 36 and screws 38 are adjusted from the press room by box spanners 46, 54 carried by flexible shafts 45, 53 geared to vertical shafts 40, 48. The flexible shafts permit the attachment of the spanners to a roll in either position. In a modification, Fig. 6, the roll-driving belts 140, 147 are moved to and from the rolls by toothed bars 154 provided with a hand-lever 156 and the means for pressing the expiring web against the new roll comprises a pair of rollers 159, 166 carried by arms 158, 165 secured respectively to a shaft 157 and a sleeve 164 loose on the shaft 157. The shaft 157 may be turned by worm gear 160, 161 and hand-wheel 163 to press the upper web against the lower roll by means of the roller 159, and the sleeve is also provided with similar turning gear to press the lower web against the upper roll by means of the roller 166. In this modification also, the brake shoes 122, 123 are adjusted by bolts 132 connected together by a shaft 133 rotatable by a hand-wheel 135 or bv Level gear 138, 139 and a belt 136 from the press room. The lateral position of the rolls is adjusted by bolts 127 operable by skew gear 129, 128 and vertical shaft 130. In a further modification, Fig. 10, a pair of driven rollers 207, 208 are carried by cross-heads 203 which may be turned in either direction by the depression of a corresponding pedal so as to press the upper web into contact with the lower roll by means of the roller 207 or the lower web into contact with the upper roll by means of the roller 208. The knives 222, 225, carried by pivoted arms 221, 225 are operated by cords against the action of springs. In a further modification, Fig. 16, the web passes between a pair of rollers 240, 237 on arms 339, 236 fixed to shafts 238, 235 provided with gears engaging a gear operable by a belt and hand-wheel. By turning the hand-wheel, the arms 236, 239 move together in the same direction to press the upper web into contact with the lower roll by means of the roller 240 or the lower web into contact with the upper roll by means uf the roller 237. In a further modification, the web passes between a pair of spaced rollers carried by cross-heads which may be turned in either direction by gearing and a hand-wheel to cause one or the other of the rollers to press the expiring web against the new roll.