Patent GB-358166-A (GB)
Title: Improvement in web controlling mechanism for printing or other machines
IPC: B65H23/08
Filed: 1930-07-19
Abstract: 358,166. Feeding webs. GOSS PRINTING PRESS CO., 1535, South Paulina Street, Chicago, U.S.A.-(Assignees of Richter, C. J. ; 2304, Lombard Avenue, Berwyn, Illinois, U.S.A.) July 19, 1930, No. 21920. Convention date, Dec. 14, 1929. [Class 100 (i).] In a web-controlling mechanism for printing- presses and other machines in which a pilot roller, in engagement with and responsive to variations in the tension of the web, controls means for braking the web-roll, the web-roll brake comprises friction belts engaging the surface of the roll and attached to a roller which is periodically rotated by a spring to wind up the belts to maintain them in contact with the roll. As shown in Fig. 1, an active roll 14 and a reserve roll 15 are mounted on a support 11 and each roll is provided with a number of braking belts 20, Figs. 1 and 2, attached at their lower ends to rods 21 and at their upper ends to rollers 24 loosely mounted upon their shafts 25 and connected thereto by torsion springs 31 tending to wind the belts 20 on the rollers. The springs 31 are normally prevented from turning the rollers by brake shoes 39 engaging brake drums 36 secured to the rollers. To the shafts 25 of the rollers are secured arms 62 connected by links 63 to an arm 58 carried by a pivot shaft 61 and connected by a link 59 to one end of the shaft 54 of a pilot roller 53 engaging the running web. The other end of the shaft 54 is connected by a similar link 59 and arm 58 to the shaft 61. The roller 53 is pressed against the web by a helical spring on the shaft 61, one end of the spring being fixed to the shaft and the other end to a worm wheel 73 loose on the shaft and adjustable, to vary the spring tension, by a worm 74 geared to a hand-wheel 75. The brake shoes 39 are pivoted at one end to a pin 38 on a member 37 fixed to the shaft 25 and are pressed against the brake drum 36 by a spring 41 on a bolt 40 provided with a handwheel 42. Pivoted to the member 37 between the ends 44 of the brake shoes is a cam 43 adapted, when rotated, to separate the shoes and allow the spring 31. to act. The cam is provided with an extended arm 46 adapted to co-operate with a stop 65 adjustable in position by a handle 80 provided with a locking latch 82. In operation, upon slight variation of the tension of the web, the pilot roller 53 moves back or forth causing a corresponding movement of the shaft 25 and, with it, the brake shoes and roller 24, thus correspondingly varying the braking effort of the belts 20. Upon an extreme movement of the roller 53 to the right due to the diminishing diameter of the web roll, the arm 46 engages the stop 65 and turns the cam 43 to release the brake shoes and allow the spring 31 to act. The resulting increased tension on the web moves the roller 53 to the left and the brake is again applied by the spring 41. To allow the belts 20 to be loosened to facilitate the insertion of a new roll, the stop 65 is moved to the right to operate the cam 43 and release the brake shoes, the roller 24 is turned by a bar inserted in holes 79 in the brake drum 36, and the stop 65 is then turned to the extreme left to allow the brake to be re-applied. In a modification, the spring for pressing the pilot roller against the web, is also mounted on the shaft 25 of the drum 24 instead of on the shaft 61.