Patent GB-478632-A (GB)
Title: Web renewing mechanism for printing machines
IPC: B65H19/18
Filed: 1936-07-18
Abstract: 478,632. Feeding webs. HOE & CO., Ltd., R. (Hinkel, O.) July 18, 1936, No. 22604/37. Divided out of 478,578 under which a Specification was laid open to inspection under Sect. 91 of the Acts, Feb. 1, 1937. [Class 100 (i)] Web-renewing mechanism for a printing-machine comprises a support for a number of rolls, movable to bring the rolls in succession to a web - renewing position, guiding devices being provided to guide the web from the running roll when in renewing position so that the path of this web adjacent the new roll is unaffected by further decrease in diameter of the running roll, the deflection of the web into contact with the new roll being effected in the passage of the web between the guiding devices. Means are also provided for stopping the movement of the roll support with the periphery of the new roll at a predetermined distance from the running web. Improved means are also provided for adjusting a belt which serves for speeding up the new roll and also as a brake for the roll when unwinding. The running roll 15, Fig. 1, new roll 13, and second reserve roll 14 are carried by a support 12 rotatable to bring the rolls in succession into the normal feeding position, which is that occupied by the roll 13, and into the web-renewing position shown. A framework of the construction described in Specification 478,578 and comprising a support 37 carrying a knife mounted between a pair of sheath plates 32, 33, and a second support 31 carrying a web deflecting brush 26, is then turned down about the pivot shaft 28 from an inoperative position to the position shown in which the sheath plates 32. 33 bear against and form a stationary guide for the running web 24. Between this guide and a guide roller 23 on the frame the web runs in a path, adjacent the roll 13, which is unchanged as the roll 15 continues to unwind. The brush and knife are actuated to complete the renewing operation in the manner described in Specification 478,578. The motor geared to the shaft 102 of the roll support 12 for rotating the support may be started manually and stopped by a limit switch pre-set in accordance with. the diameter of the new roll so that the support is stopped with the periphery of the roll at a predetermined distance from the running web 24. The limit switch is actuated by a lug 104, Fig. 16, carried by a member 103 fixed to and rotating with the shaft 102 of the support 12. The member 103 comprises a plate 109 fixed to the shaft 102 and a casing member 108, to which the lug 104 is. fixed, rotatable on the plate 109 and adjustably secured thereto by the engagement of one or three studs 116 (one for each roll) with teeth 119 on a lever 120 provided with a thumb piece 1211. The casing 108 is graduated in accordance with various diameters of rolls and an indicator mark is provided on the edge of the plate 109 opposite to each stud 116. In operation, the diameter of the new roll is measured, the indicator mark of the appropriate stud 116 is set to the corresponding graduation on the casing 108 resulting in positioning the lug 104 so that the limit switch is actuated when the roll remains the correct position. The belt 16, Fig. 1, for controlling the unwinding of the running roll is controlled by a motor 130 and switches 131, 132 actuated by a floating roller 162 as described in Specification 453,112, but in addition the circuit to the motor includes a switch which is continuously opened and closed by a separate motor so that the energization of the motor 130 is effected by timed impulses and hunting of the motor 130 is thereby prevented. Specifications 410,785, 453,046, 478,630, and 478,633 also are referred to.