Patent GB-191218074-A (GB)
Title: Improvements in Web Roll Renewers.
Inventor: HOE ROBERT
IPC: B65H19/18
Filed: 1912-08-06
Granted: 1913-07-31
Abstract: 18,074. Hoe, R. Aug. 6. Feeding webs.-Printing - machines for webs, and for bag and envelope making machines, are fitted with means for renewing the web rolls without stopping the machine, and also for removing the spent rolls, the construction being such that the new roll with paste applied is pressed against the expiring web as this passes over a rigid abutment which may consist of an adjustable roll against which the new roll is fed to forward the web. The new roll is preferably pressed by fluid pressure, and it is speeded up to the speed of the expiring web before being attached thereto, and is controlled so as to make contact with the abutment by a timing cam on its spindle so arranged that the roll makes nearly a complete revolution before the paste on the outside of this roll contacts with the expiring web. As shown, the apparatus comprises a carriage 11 Figs. 1 and 2, formed with pivoted bearings 13 into which the spindle 12 of a new roll X is placed after being passed over an upper track 16. The carriage 11 is adapted to move over a fixed track 10 by the action of compressed air on the piston in a cylinder 42, the piston rod being formed with a rack 41 connected by gearing 40, 38, 37, 36 with racks 34 fixed to the carriage 11. The new roll X is provided with paste at some distance from its leading edge for attaching to the expiring web and the leading edge is lightly pasted down to the roll. The spindle 12 of the roll is adapted to be controlled by upper and lower brake members 17, 18, Figs. 1 and 9, which are attached to pivoted arms 20 on a rod 22 which is fixed to a slide 28 movable laterally by a screw member to adjust the roll for margin adjustment. The pressure of the brake members is controlled by a screw 23 which permits the upper member to be swung back as shown in Fig. 1 while a new roll is inserted. The lower brake member 18 is normally supported by a pin 1 resting on a cross-slot in a spring-controlled member 25 pivoted to the block 28, and the member 25 is moved by a stop 27 to lower the brake 18 while the roll spindle 12 is being removed from its bearings 13 to bearings 73 in a shifter member 66 which automatically displaces the supply roll when it is reduced to a certain diameter. This shifter 66 removes the roll to the position shown in Fig. 18, and the web y continues to be fed from the nearly used roll Y while the carriage 11 is returned, by reversing the air pressure on the piston in cylinder 42, to receive a new roll, and until the new roll is forwarded by again reversing this pressure. A valve 45 operated by a hand lever 46 controls the air supply to this piston, and a control valve 48 and release valve 200 are provided to allow the junction of the webs to take place at a high pressure, and after this is effected the pressure is lowered by opening valve 200, and the valve 48 is then adjusted to press the roll X with the required pressure against an adjustable roller 126 which serves as the abutment against which the old and new webs are pressed to effect their junction, and also as a feeding roll for forwarding the web in the normal running of the press, an idle roll 128 assisting in this action. Before the new roll X is pressed against the expiring web it is rotated by a belt 50 mounted on pulleys on a driven shaft 51 and on the extremities of pivoted arms 53 mounted concentrically to the shaft 51. The belt 50 is brought into contact with the roll by moving the arms 53 by lever mechanism from a cylinder 60, to which compressed air is admitted by moving the arm 64 of a valve into the position shown in Fig. 1. As the carriage 11 moves to the right, it operates the handle 64 to release the pressure on cylinder 60 and the belt is lowered. The handle 64 is fitted with an inclined trip piece 65 adapted to be operated only when the carriage moves to the right. The belt 50 is driven slightly faster than the normal speed of the web so as to allow for subsequent slowing-down of the roller before the junction takes place. To cause the join to be effective, the leading edge of the web is placed in a certain position relatively to cams 32 on the shaft 12, and these cams act on spring-raised stops, which check the movement of the carriage 11 just prior to its being pressed against the roll 126, and release the carriage so as to cause the roll X to move for nearly a complete revolution before its paste meets the expiring web. After the junction is effected and the old web severed in a manner to be described, the web roll is maintained by pneumatic pressure in contact with roll 126 and the feeding continues until the roll X reaches a certain size. The roll is then transferred to bearings 73 in a carriage 75 carried by the member 66 pivoted at 67 to an oscillating member 68, and provided with runners 76 moving in fixed slots 71. The carriage 75 is fitted with hooks 74 which when the carriage has been moved back by the pressure of spindle 12 are released and held by a catch 2 which holds the spindle securely in the carriage 75 and holds the carriage 75 in its rear position. The movement of the carriage 75 operates push-buttons 7 and contacts 84 to complete the circuit to a reversible motor, which drives a gear 100 which oscillates the pivoted member 68, and also throws in an electromagnetic clutch to operate worm gearing which acts through a flexible coupling to drive the gear-wheel 100. The web roll is thus carried to the position shown in Fig. 18. As the bars 66 move downwards, the bearings 13 which, as shown in Fig. 13, move down under the action of springs 15 into apertures 76 in the bars 66 to deliver the spindle to the bearings 73, are free to return to their original position when the carriage 11 is withdrawn. When the roll Y reaches the position shown in Fig. 18, a contact-breaker 102, Fig. 1, is operated to break the circuit of the driving-motor and stop the movement of the oscillating member 68 and the bars 66. The roll Y remains in this position until the new web is joined up, and then the catches 2 are operated to release the roll from the bearings 73, by means of a link 5, Fig. 16, operated by a handle 79, which also operates by a link 81, lever 82, and link 83 the contact 84 and thus reverses the driving motor which returns the bars 66 to a position to receive the next roll, a contact-breaker 105 acting to stop the driving- motor automatically. The link 5 also acts on a stop 6 which positively raises the hooks 74. The arm 79 is arranged to release one end of the spindle 12 before the other so as to cause the web to be torn automatically, but if desired the web may be torn by hand. The spent roll is received by bearings 112 on arms 111 on a spring-controlled shaft 113, which is depressed by the weight of the spent roll to deliver the roll to a carriage 121 moving on a track 120. The movement of the arms 111 is controlled by a dash-pot device, and the carriage 121 which is normally held by a catch 124 in a position to receive the spent rolls is released from this catch by a stop on an arm 111 when the arms are further depressed by a handle 201. While the roll is in the bearings 73 it can be moved for margin adjustment by means of a shoe on a sleeve which is caused to be moved laterally by a screwed shaft engaging a half-nut on a pivoted arm prevented from moving laterally relatively to the carriage 75. This pivoted arm is raised until the shaft 12 is released from the brakes 17, 18; the brake pulley 19 then engages the said shoe and the half-nut comes into engagement with the shaft and permits lateral adjustment of roll. The roll 126 may be replaced by an abutment of any suitable form, and other electrical contacts may be used to control the movements of the oscillating member 68.