Patent GB-385337-A (GB)
Title: Improvements in or relating to web supply mechanism for printing machines
IPC: B65H19/18
Filed: 1931-07-03
Abstract: 385,337. Feeding webs. HOE & CO., Ltd., R., 109, Borough Road, London.- (Assignees of Tomlin, J. R. ; 910, East 138th Street, New York, U.S.A.) July 3, 1931, No. 19255. Convention date, Feb. 2. [Class 100 (i).] In a web-renewing mechanism for a printing- machine, the new roll is rotated, by engagement of its periphery with rotating means, at a peripheral speed equal to that of the running web, an adhesive is applied to the new roll, while it is rotating, to enable it to be joined to the running web, and the running web is then severed. The running roll 9, Fig. 1, and a new roll 11 are supported by short spindles 6, 61, Fig. 2, rotatably mounted in arms 4, 4<1> on a shaft 3 which is rotatable to bring the rolls successively into the normal running position which is that occupied in Fig. 1 by the roll 11. One spindle 6 of each roll has adjustably secured to it an arm 91 carrying an electric contact 92 which is adapted to make contact at each revolution of the roll with a contact 93 secured to the arm 4, and the arm 91 is so positioned as to point to the end 103 of the web on the new roll when the renewing operation is to be performed. The end 103 of the web is lightly attached to the body of the roll. A tubular valve 12, Fig. 1, to which an adhesive under pressure is supplied, is adapted to be rocked within a casing 13 so that apertures 35 in the valve move from one side to the other of apertures 36 in the casing 13, ejecting a quantity of adhesive on to the surface of the roll 11. The rocking of the valve is effected by solenoids 16, 161 the common armature 15 of which is connected to an arm 14 on the valve. The solenoids are mounted on the casing 13 which is carried by a shaft 18, an arm 19 on which is connected by a link 21 to one arm 22 of a threearmed lever, another arm of which is connected to a spring 24, and the third arm is provided with rollers 25 engaging in a groove 26 in a collar 27 slidably and non-rotatably mounted on a shaft 28 driven in timed relation with the printing-machine. The collar 27 is connected by a link 34 to a ring 33 mounted on trunnions 32 on a block 31 fixed to the shaft 28. The ring 33 tends to move to a position at right-angles to the shaft 28, turning the valve casing 13 in a clockwise direction, the position of the apertures 36 thus being varied automatically with the speed of the press in order to apply the adhesive to the roll in the correct position. The means for severing the running web after the joining operation comprises knives 431 carried by a pair of arms 43 pivoted to blocks 45, 45<1> and formed with arms 54 connected to the armatures 55 of a pair of solenoids 56 arranged in parallel and in a circuit containing a fixed contact 94 and a contact 95 carried by a lever 96. This lever carries a roller 98 between which and a roller 99 the web W passes, the arrangement being such that upon the passage between the rollers of the double thickness of web due to the join, the rollers are separated to close the contacts 94, 95 to cause actuation of the knives 43<1>. When a renewing operation is to be performed the arms 4 are turned to bring the new roll into engagement with the running web as shown and the new roll is thereby caused to rotate at web speed, the rotation being assisted by a pressure roller 37 carried by arms 38 acted upon by a weighted arm 42. A pushbutton switch 71 is then operated to bridge contacts 73, 731 and also, by means of a rod 76 and lever 77 carrying a pawl 79, to turn a ratchet disc 81 to cause a bridging connection 82 thereon to bridge contacts 83, 85. A circuit is thereupon made from the main L<1> through leads 104, 105, bridge 82, lead 106, solenoid 16<1>, lead 107, contact ring 89<1> which is mounted on the arm 4 concentric with the shaft 3, and lead 109 to contact 93. The contact 92 is connected through contacts 86, 88 of a mercury switch to a second contact ring 89 on the arm 4 to the return main L". At the moment the contact 92 engages the contact 93, the circuit is completed causing the solenoid 16<1> to rock the valve 12 to supply adhesive to the roll adjacent the end 103. Upon further rotation of the roll its web becomes united to the web W which is afterwards severed as described above. The ratchet disc 81 receives a quarterturn at every operation of the switch 71 so that the contact 83 is alternately connected to the contact 82 and a contact 84 which is connected to the solenoid 16 so that the solenoids 16, 161 are excited alternately. The mercury switch is reversible upon reversal of the arms 4 to put the contact 88 in circuit through the mercury with the contact 87 which is connected to the contact 921.