Patent GB-458765-A (GB)
Title: Improvements in paper web connecting mechanism for printing presses
IPC: B65H19/18
Filed: 1935-06-24
Abstract: 458,765. reeding webs. FISCHER, W. F., 501, E. Mount Pleasant Avenue, Philadelphia, U.S.A. June 24, 1935, No. 18079. [Class 100 (i)] In a web-renewing apparatus for a printing-press, the expiring roll is lifted from its normal fixed bearings by a pair of arms guided in their. upward movement by inclined bars, the arms normally being held in retracted position by electrically releasable pins, and the movement of the new roll into the bearings opens a valve to bring, by fluid pressure means, a swinging frame carrying running belts into contact with the new roll to bring it to the speed of the expiring web. Each deck of a multi-deck press is provided with roll - supporting arms 27, Fig. 1, having bearings 36 to receive the roll spindle 28. The rolls are pushed into the bearings by trollies 31 supporting the ends of the spindle and connected together for equality of movement by endless chains 33 passing over sprocket wheels 34 on a cross shaft 35. A set of belts 59 are carried by a frame 42 secured to a shaft 49 to which is also secured a bracket 48 to which is adjustably connected a fluid pressure device comprising an outer cylinder 41 and an inner cylinder 44. As the roll 29 moves into the bearings 36, its spindle engages and opens a valve 38 to admit air under pressure to the cylinder 44, causing an upward movement of the cylinder 41 and thereby swinging the belts 59 into contact with the roll. The belts pass round pulleys 54, Figs. 1 and 14, loose on the shaft 49 and carrying sprocket wheels 55 connected by chains 84 to sprocket wheels 83 on a shaft 62 on which is loosely mounted a sprocket wheel 66 constantly driven by a sprocket chain 68 from a shaft 73. A clutch 75 actuated by a handwheel 82 serves to connect this sprocket 66 to the shaft 62 so that the belts are driven to speed up the new roll. During normal running the clutch is disengaged so that the belts act as a roll brake. When a roll is nearly exhausted, it is raised from the bearings 28 by a pair of arms 100, Figs. 1 and 4, pivoted to vertical racks 85 adapted to be raised and lowered by an electric motor the circuit of which is broken at the extreme limits of movement of the rack bars by limit switches actuated by strip devices on the bars. The arms 100 are normally held folded against the rack bars by pins 104, Fig. 4, connected to the armatures of solenoids 105, and rollers 102 on the arms are disposed above fixed inclined guide bars 103. Upon energizing the solenoids 105 to release the pins 104, the arms are thrown forward by springs 107 so that the rollers 102 engage the guides 103 and as the rack bars are raised the expiring roll is lifted to the position shown in Fig. 1. A brush 134 for pressing the expiring web into contact with the new roll is carried by an arm 133 fixed to a shaft 123 carrying an arm 124, Fig. 5, slotted to embrace a vertically reciprocable rod 114 and provided with a lug 128 normally held by a pivoted latch 129 so as to hold the brush in the raised and inoperative position. A head 126 loose on the rod 114 is pressed down on to the arm 124 by a spring 127. The lower end of the rod 114 carries a solenoid 117 which upon being energized by the closing of a switch 138 moves its armature so that a disc 118 thereon is moved into the path of a cam 113 rotating with the roll. The rod 114 is thereby depressed and a member 121 at its upper end strikes a cam surface 132 on the latch 129, releasing the arm 124 and allowing the bush to be pressed down by the spring 127 to join the webs together. On the upward movement of the rod 114 by a spring 119 thereon, the switch 138 is opened by a trip device 145 acting through lever 139 and switch rod 143 so that the solenoid 117 is de-energized and withdraws the disc 118 from the path of the cam 113. During the upward movement of the rod 114, a resilient trip finger 122 thereon engages and turns an arm 149 on a shaft 147 which through arm 150, Fig. 1, link 151 and arm 152 turns a shaft 154 to depress a knife 146 and sever the old web. The roll spindle is provided with a brake brought into operation upon stoppage of the press. A head 161, pivoted on a pin 160, has an arm 162 connected to the armature 163 of a solenoid 164 and an arm 167 connected by a link 168 to a brake shoe arm 171. A second brake shoe arm 173 is pivoted to the arm 167 and its free end 174 rests upon a cam head 165 moving with the head 161. When the press is stopped the solenoid 164 is excited, turning the heads 161, 165 and applying the brake shoes to the brake drum 112. Specification 318,902, [Class 100 (i)], is referred to.