Patent GB-429129-A (GB)
Title: Improvements in roll changing apparatus for printing presses
IPC: B65H19/18
Filed: 1934-03-12
Abstract: 429,129. Feeding webs. CLINE, A. J., 111, West Washington Street, Chicago, U.S.A. March 12, 1934, No. 7815. Convention date, Aug. 14, 1933. [Class 100 (i)] In printing-presses having a number of printing units each with its own webroll support and web-renewing mechanism, control means are provided whereby the web-renewing mechanisms may be actuated singly or may be associated together in a number of groups, the mechanisms in a group being operated simultaneously but independently of those in another group or group. Fig. 1 shows a roll support and webrenewing mechanism for each unit of the press. The active roll 12 and reserve rolls 13, 14 are mounted on three-armed frames 24 secured to a shaft 23 which may be rotated by a motor 26. Belts 27, anchored at their lower ends to spring bolts 28 and at their upper ends to a rotatable drum 34, which may be driven as described in Specification 267,882, serve to tension the running web, and are provided with brush portions 37 against which the new roll presses the expiring web during the renewing operation. When this operation is to be performed the frames 24 are turned by the motor 26 to bring the roll 13 closely adjacent the web 15. A motor 52 is then operated to move a roller 38, Figs. 1 and 2, against the belts 27 to increase their pressure on the expiring roll and to bring cutters 79 into position adjacent the expiring web as shown in full lines in Fig. 2. The roller 38 is carried by angled levers 39 mounted on a pivot 41 and connected by a link 43 to a crank arm 45 driven by gearing from the motor 52. A limit switch 124 is actuated by the arm 45 at the end of its movement to stop the motor 52. Short cutters 79 adapted to extend between the belts 27 are carried by shafts 82 on arms 77 secured to a shaft 76 pivoted in the ends of the arms 39. A short arm 75 on the shaft 76 is connected by an adjustable three-part link 73, 72, 71 to one end 67 of a two-armed lever, the other end 64 of which is held by a pivoted latch 56 carrying a pivoted dog 54 which, in the position of the parts shown in Fig. 2, engages behind an extension 53 of the pivot connecting the link 43 and crank 45. The motor 26 is now restarted to cause the roll 13, previously prepared with adhesive, to press the web 15 into contact with the brush sections 37 to rotate the roll and effect the join. A limit switch on the frame 24 is provided to cut out the motor 26 when the roll is in this position. The motor 52 is now driven in the reverse direction to return the arms 39 and associated parts to their normal position in which position the motor is stopped by the opening of a limit switch 129, Fig. 1, by the crank 45. At the beginning of this movement, however, the pivot extension 53 turns the latch 56 to release the two-armed lever 67, 64, allowing a spring 68 to actuate the link 71, 72, 73 to turn the cutters 79 into the position shown in broken lines in Fig. 2 to sever the expiring web. During the return movement of the arms 39 the motor 26 is restarted to bring the new roll into the normal running position. To prevent excessive tension on the web during the joining operation, a roller 17 pressed against a loop in the web by a weight 88 is provided. One end of the roller 17 is carried by an arm 83 pivoted to an arm 85 which is pivoted to the frame and is adjustable by a screw 93 and handwheel 98 to take up slack across the width of the web. Fig. 6 shows diagrammatically a press comprising five units 109, each of which by suitable clutches can be connected to one or the other of two folders 111. Each unit is provided with a control panel for the web-renewing mechanism and one of these panels is shown in Fig. 5. Upon clutching the units to the folders, a switch 114 closes one or the other of two contacts 169, 171 and when switches 103, 106 are closed circuits are completed through relay coils 116 and red signal lamps 107 for all units connected to one folder, and through relay coils 117 and green signal lamps 108 for all units connected to the other folder. The contacts 174 of the relays 116 are connected in parallel by bus bars 112 and the contacts 175 of the relays 117 are connected in parallel by the bus bars 113. Thus all renewing mechanisms of which the relays 116 are energized are simultaneously actuated by operation at the panel of any one of those mechanisms, and similarly for those of which the relays 117 are energized. For individual actuation the switch 106 is opened to de-energize the relay 116 or 117 and this is the condition shown in Fig. 5. To operate the web-renewing mechanism a master switch 105 is turned in one direction to close contact 118, Fig. 5, closing a circuit from positive main X through relay coils 121, 122 and normally closed limit switch 124 to negative main Y. Relay 121 closes a circuit 125, 126 in the main control circuit of the press to slow down the press to the desired speed. A circuit for maintaining the relay 121 energized after the contact 118 is opened, is closed by the relay contacts 127, 128. Relay 122 closes a circuit for driving the motor 52 to move the renewing mechanism to the position shown in Fig. 2 after which the circuit is opened by the limit switch 124. Switch 105 is now turned in the opposite direction to close contacts 132 and 133, 142 and 143, and to open contacts 151 and is held in that position until the join of the webs is effected. Contacts 132, 133 close a circuit to a relay 134 which through contacts 136, 137 closes a maintaining circuit for itself. Contacts 142, 143 close a circuit to a relay 144 which by contacts 145, 146 closes a maintaining circuit for itself. A circuit is also completed through contacts 132, 133, a closed limit switch 139 on the roll frame 24 and lead 168 to the motor 26 to turn the roll stand to effect the join, upon which the switch 139 is opened. The switch 105 is now returned to normal position, closing contacts 151 to complete a circuit through contacts 147, 148, previously closed by the relay 144, to a relay 149. Closure of contacts 152, 183 of this relay energizes relay 154 to close circuit of motor 52 to return the web-renewing mechanism to normal position, and to close circuit of relay 157 which by closing contacts 166, 167 restarts the motor 26 to bring the new roll to normal running position. At the end of the operation limit switch 129 is opened and the motors 52 and 26 brought to rest. Specification 267,882, [Class 100 (i)], is referred to.