Patent GB-502350-A (GB)
Title: Web supply mechanism for printing and other machines
IPC: B65H19/18
Filed: 1937-09-13
Abstract: 502,350. Feeding webs. HOE & CO., Ltd., R. Sept. 13, 1937, No. 24895. Convention date. Sept. 15, 1936. [Class 100 (i)] A web-renewing mechanism for a printing or other machine in which the expiring web is pressed against the new roll by a web-deflector, is provided with means to restrain the deflector against movement into deflecting position, means to release the restraining means, and a hand-lever which upon movement into engagement with it stop serves to tension a spring by which the deflector is moved into deflecting position and to operate a device to control the operation of the deflector releasing means. A web-deflecting brush 22, Fig. 1, is carried by arms 26 normally connected by a solenoid released latch 34 to arms 27 carrying a knife 23 for severing the expiring web 16, the arms 26, 27 being pivoted on a shaft 24. When turned into the position shown in full lines from the normal inoperative position shown in dotted lines, the arms 27 are held by a spring 31 against a fixed stop 29. A hand-lever 47 is fixed to a shaft 44 to which is also secured an arm 43 connected by a spring 42 and cable 39 to one of the arms 26 so that upon movement of the lever 47 from a normal vertical inoperative position into contact with a stop 49, which may be an adjustable screw, the spring 42 is tensioned to cause movement of the brush 22 to deflect the web 16 into contact with the new roll 14, when the latch 34 is released by the excitation of its solenoid 38. The circuit of the solenoid is controlled by two switches, one, 53, being actuated by the hand-lever 47 as it is moved to tension the spring 42 and the other, 57, being actuated by a cam rotating with the new roll and serving to ensure that the web 16 makes contact with the roll 14 before the usual pasted area of the roll-comes opposite to the brush 22. The switch 57 is carried by the hub 58 of the roll support 11 in such a manner as to remain stationary during the rotation of the support, but to move axially with the support as the latter is adjusted for rolls of different widths. For this purpose the switch is mounted on a bracket 59, Figs. 1 and 3, carried by a ring 61 mounted on rollers 62 secured to the hub 58 by screws 63 carrying washers 64 to retain the ring against the hub. Rotation of the ring with the hub is prevented, and axial movement with the hub is permitted, by means of a rod 65 engaging a groove between guide bars 70, 70<1>, or, as shown in Fig. 5, by links 121, 122 pivoted together at 124 and pivoted respectively at their outer ends to the ring 61 and to the stand 99 carrying the roll support. Each roll position on the roll support 11 is provided with means for actuating the switch 57 when the roll is in web-renewing position, and such means comprises a cam 55 rotating with the new roll, and a cam roller 84 carried by a rod 82 provided with a shoe 77, a spring 91 on the rod 82 holding the roller 84 clear of the cam when the roll is not in renewing position. The switch 57 is provided with an actuating lever 66 having a roller 67 adapted to be engaged by an arm 68 pivoted at 71 to the switch bracket 59 and normally held by a spring on the pivot 71 in contact with an adjustable stop 72. As the roll support 11 is turned to bring the new roll into position, the shoe 77 engages a roller 76 on the arm 68 and, the spring on the pivot 71 being stronger than the spring 91, the rod 82 is raised to bring the roller into contact with the cam 55. As the cam 55 rotates it depresses the rod 82 and arm 68 thereby actuating the arm 66 to close the switch 57. Specification 478,633 is referred to. The Specification, as open to inspection under Sect. 91 comprises also a modification in which the switch 53 operated by the hand-lever 47 is omitted and replaced by a distant pushbutton switch. This subject-matter does not appear in the Specification as accepted.