Patent GB-353037-A (GB)
Title: Improvements in printing presses
IPC: B65H19/12
Filed: 1930-03-12
Abstract: 353,037. Printing - machines. HOE & CO., Ltd., R., 109, Borough Road, London.-(Hoe & Co., Inc., R. ; 13Sth Street, New York, U.S.A.) March 12, 1930, No. 8070. [Class 100 (i).] Feeding webs; web-roll changing devices; registering webs tranversely.-A, roll-supporting device for use in a web-renewing mechanism for a printing machine comprises two rotatable roll-supporting members independently supported and completely separated from one another, and means, external to the boundary of movement of the members, for rotating them in unison. Improved means for rotating the reserve roll, for controlling the rotation of the active roll, for attaching the expiring web to the new roll and severing the expiring web, are also described. Fig. 1 shows the web-supporting apparatus for a three-deck press. On each deck, an active roll and a reserve roll are mounted on supports 12, Figs. 1 and 4, in the form of gear wheels which are rotatable upon independent shafts 24 which are non-rotatably mounted in the side frames 2, 3 but are axially adjustable by screws 30 and hand-wheels 31 for side register of the rolls. The screws are connected for simultaneous operation by chains 33 passing round sprocket wheels fixed to the screws and to a cross-shaft 35. Screw-operated plugs 14, mounted in the wheels 12, grip the tubular cores of the rolls. The wheels 12 are rotatable in unison by gears 38 on a shaft 39 which is driven by a worm wheel 40 from a worm 45, Fig. 14, on a shaft 44 adapted to be driven through a reversing gearing. This gearing comprises a double cone 49 slidable on the shaft 44 and co-operating with internally coned spur gears 65, 66 loose on the shaft 44 and gearing, one directly and the other through an idle gear, with a gear 69 on a constantly driven shaft 68. The cone 49 is raised and lowered by turning a shaft 52 mounted in a bracket 64 and provided with eccentric pins 56 connected by links to pins projecting from a split collar 50 which is mounted in a circumferential groove in the cone and is prevented from rotating by the engagement of a pin 51 in a slot in the collar. The shaft 52 is turned by linkage operated by a rod 63, Fig. 4, extending to one side of the machine. Each deck is equipped with two sets of roll-rotating belts 500, 501, Figs. 1 and 5. The set 501 serves to rotate the new roll prior to the web renewing operation and afterwards until the roll is about half consumed as indicated in broken lines at deck A, after which the roll supports 12 are rotated to bring the web into engagement with the set of belts 500 which continue the feeding of the web until it has been united to a new roll and severed. The belts are of similar construction and pass round pulleys 95, 96 on shafts 89, 90 and round pulleys 101, 102 carried by frames 97, 98 mounted to swing about the shafts 89, 90. The shafts 89; 90 are adapted to be driven through friction clutches 87, 88, Fig. 5, the driving members of which are secured to shafts 82, 86 which are connected together by chain and sprocket gear 83, 84, 85 and driven from the shaft 68 by bevel gears 80 thereon engaging bevel wheels 81 on the shafts 82. The clutches are actuated by rods 93, 94, and the opening of the clutches 87 is caused to apply brakes 116 to stop the rotation of the belts 500. When the belts 601 are operating to rotate a roll they are pressed into contact with the roll by pressure air applied to one end of a cylinder 110, Fig. 5, the piston of which is fixed to a rack bar 109 engaging a quadrant 108 fixed to a shaft 107 connected by arms 106, Fig. 1, and links 105 to the frames 98. By applying the air pressure to the opposite end of the cylinder the belts are raised and held in an inoperative position as shown at decks B, C. The expiring web is pressed into engagement with the new rotating roll, which has previously been prepared with paste, by means of a roller 130, Figs. 1 and 30, carried by arms 128 loosely mounted upon a shaft 123 and provided with lugs 127 adapted to co-operate with lugs 126 on arms 125 fixed to the shaft 123. A knife 133 for severing the expiring web is carried by a bar 131 pivoted in the arms 128 and connected by arms 134 and links 135 to the arms 125. The shaft 123 is turned by an arm 122 secured thereto and connected by a link 143 to the piston-rod 142 of a double acting air cylinder 140. During the downward movement of the arms 128 from the inoperative position shown in broken lines, the relative position of the knife 133 and arms is unaltered until the roller 130 engages the surface of the new roll after which the continued movement of the arms 125 turns the bar 131 about its axis to cause the knife to sever the web. To ensure a complete revolution of the new roll in contact with the roll 130 before the web is severed, the end part of the movement of the arms 125 is retarded by the provision of a dashpot consisting of an oil-filled cylinder 147 containing a piston secured by a rod to the piston of the cylinder 140. The opposite sides of the piston are connected throughout its stroke by a byepass 150<1>, and also for that part of its stroke corresponding to the movement of the arms 128 by a second byepass 151<1>. Controlling valves 150, 151 are provided in the byepass pipes. Towards the end of the downward movement of the arm 122, a roller 120, Fig. 5, mounted thereon engages a cam projection on the hand-lever 117 provided for actuating the clutch rod 93, so that the clutch is opened and the brake 116 applied. The web passes to the press over a guide roller 166, Fig. 30, so positioned with respect to the are of movement of the roller 130.that the tension of the web is unchanged by the movement of that roller. The operation of the web-renewing mechanism at any deck is caused to actuate mechanism to apply to mark to that web which will form the outside pages of the product in such a position as to be visible in the product and indicate those copies.which contain the pasted and doubled portion of the web. For this purpose one of the arms 125 at each deck is provided with a lug 152 formed with a catch plate 153 co-operating with a hook 154 on a sleeve 155 slidable on and operatively connected by a spring 157 to a rod 156 which, with the corresponding rods 164, 165 of the other decks, is pivoted to one arm of a lever 159 the opposite end of which carries a crayon or other marker 161. Upward movement of any rod 156, 164, 165 due to a web-renewing operation at the corresponding deck depresses the marker into contact with the outer web until the catch plate 153 slips past the hook 154. The movements of the lever 159 may be caused to switch on and off a signal lamp 193. When the running roll is about half exhausted, the supports 12 are turned from the position shown on deck A, Fig. 1, to that shown in deck B. Pivoted rails 167 are then raised by cams 168 on a manually operated shaft 169 into engagement with the exhausted roll. Upon withdrawal of the roll holding plugs 14, the roll runs down the rails 167 on to rollers 37 by which the roll can be moved endwise for removal. The supports 12 are then turned to the normal running position shown in deck C. Preferably each set of belts 500, 501 consists of two pairs arranged as shown in Fig. 27 so as to be suitable for a full width roll or for a half-width roll arranged to one side in which case one pair only of the belts would be used, or for a half-width roll arranged centrally as shown, in which case the inner belt of each pair is employed. When employing half-width rolls the rolls are mounted on a shaft 179 supported in bores in the plugs 14, a centrally arranged roll being gripped by plugs 178 mounted on screwed portions of the shaft, and a side-supported roll gripped between a plug 14 and a single plug screwed on to the shaft 179. Fig. 39 shows a hoisting plug for lifting rolls provided with hollow cores 13 or with axial shafts, such plug comprising a cylindrical member 186 to engage within the core 13 and provided with a bore 185 to fit over the end of a shaft. The inner and outer surfaces of the member 186 are roughened or provided with a fine screw-thread to increase their grip. The member 186 may be counterbalanced by a weighted handle 192 and is attached centrally to a hoisting chain 191. Specification 353,072 is referred to.