Patent GB-982611-A (GB)
Title: Improvements in web renewing mechanism
Inventor: WILLIS CLAUDE EDWARD FREDERICK
IPC: B65H19/18
Filed: 1963-01-01
Abstract: 982,611. Feeding webs. R. W. CRABTREE & SONS Ltd. Dec. 30, 1963 [Jan. 1, 1963], No. 95/63. Heading B6B. Web-deflecting mechanism.-In a web-renewing mechanism in which a running web 5, Fig. 1, is spliced to a rotating web-roll 1, a web-deflecting mechanism which includes a brush 28, Fig. 2, is held ready in a rocked position by an electromechanical device. As soon as the electromechanical device is released, a spring 29 urges the web-deflecting mechanism against the running web to cause a splice. As shown in Fig. 2, the web-deflecting device comprises a pair of pivoted bell-crank levers 22, having a head 21 with a brush 28. The levers 22 are pivoted at 33 to a pair of support arms 23 pivoted at 24 to the machine frame 25. The spring 29 is connected at one end to the bellcrank levers 22 and at the other end to a member 30 carried on the support arms 23. An electromagnet 31 with an armature 32 connected to the bell-crank levers 22 holds the levers 22 in a cocked position when energized. A running web severing knife 34 is provided with spring means (not illustrated) urging the knife into its operative position. An electromagnet 37 has its armature connected to a lever 36 provided with a pin 35. The pin 35 holds the knife in its inoperative position when the electromagnet 37 is de-energized. The support arms 23 are connected by a lug 27 to the operating arms 26 of a reversible electric motor 8c, Fig. 1. The electric motor 8c can position the support arms 23 in their operative position as shown, or in their retracted position 23a as shown in broken lines. A lever 39 pivoted at 40 to the support arms 23 has a cam-follower roller 41 which co-operates with a cam 42 attached to the machine frame 25. A link 38 connects the bell-crank lever 22 to the lever 39. After the web-deflecting mechanism has deflected the running web on to web-roll, and the support arms 23 are moved to their retracted position, the cam 42 operates through its follower 41 to re-cock the bell-crank levers 22. The face 45 of the cam 42 similarly acts on the follower of a rod 43 to partly rotate the rod which re-cocks the knife 34 via an arm 44. Control mechanism.-When splicing has to take place, the replacement web-roll 1 is rotated and a master switch 14, Fig. 1, is closed on to a contact 20 either manually or automatically. A contact 3 on the shaft 4 of the web-roll next makes contact across brushes 2, and a relay 13 receives an electrical impulse which results in a lever 13c pivoting about its axis to drive a cam-shaft 13a through one position, via a cam disc 9 mounted for rotation with the shaft in one direction only. This causes cams 10, 11 and 12 to advance one position resulting in the closure of switch 15. When the contact 3 leaves the brushes 2, the circuit to the relay is broken, and cam disc 9 returns to its original position, closing switch 18. On the next impulse to the relay 13, the cam-shaft 13a is stepped further, resulting in the opening of switch 16 which de-energizes electromagnet 31 releasing the web-deflecting mechanism. On the third impulse, the switch 17 is closed, energizing electromagnet 37 and releasing the knife 34. Operation of the knife energizes two secondary circuits 8a and 8b which in turn respectively change switch 14 over to contact 19 and energize the motor 8c to retract the supporting arms 23. With the switch 14 in contact with 19, a circuit is still completed via switches 18 and 15 when next the contact 3 crosses the brushes 2, resulting in a further stepping of the cam-shaft 13a until cam 10 opens switch 15. The control system is then set for the next web-splicing operation.