Patent GB-301829-A (GB)
Title: Improvements in brake mechanism for web supply rolls
IPC: B65H23/06
Filed: 1928-11-30
Abstract: 301,829. Goss Printing Press Co., (Assignees of Richter, C. J.). Dec. 6, 1927, [Convention date]. Feeding and registering webs.-A braking- mechanism for regulating the tension on rotated shafts, such as web supply roll shafts for printing and like presses, comprises an integral or self-contained brake device mounted independently of the shaft to be braked and having coacting braking-members mounted in permanent relation, a temporary connection being provided for detachably connecting the braking device to the shaft to be braked. As shown in Figs. 1 and 3, the brake comprises a pulley 30, splined to a shaft 29 mounted in a frame formed of parts 22 - - 26, side members 39, 40, and bosses 42, 43 formed with slots for receiving bolts for securing the brake frame to the frame 5, in which is mounted the shaft 1 of a web roll 2. The bolt- and-slot connection of the brake frame permits it to be adjusted vertically to compensate for wear of the shaft 1. The pulley 30 coacts with brake-shoes 93, 94 carried by pivoted arms 97, 98 controlled by a bolt 109, spring 113, and nut 112 of usual construction. The braking pressure is thus controllable by nut 112, or it may be arranged to be controlled automatically by the tension of the web. The connection between the shafts 1, 29 comprises a reduced square end 49 on shaft 1 tapered at its extremity, and a similarly shaped socket of slightly larger size formed in an enlarged head 47 on shaft 29. A spring- pressed plunger 57 in the head 47 engages a hole in the reduced part 49 of shaft 1 to cause the shafts 1, 29 to rotate together. The shaft 29 is moved axially to connect and disconnect the shafts by means of pins 72 on the forked end of a lever arm 69, the arms 72 engaging a groove 74 in the head 47. The lever 69 is connected adjustably by a pivoted bolt 79, and nuts 81, 82 to a lever arm 77. The arm 77 is normally fixed in position by a spring-pressed plunger 85 engaging an aperture in the frame member 23, but this plunger is released when the shaft 29 is to be moved for connection to or disconnection from shaft 1. For fine adjustment the nuts 81, 82 are used, and by this means lateral register of the web is secured. In a modification, Figs. 6 and 8, a disc brake is used which is movably mounted as a whole to bring the brake shaft into and out of connection with the roll shaft 1. The brake slides on rods 122, 123, attached to the brake frame 121 secured by bolts to the main frame 5. The brake has loose pivotal connections to operating arms 136, 137 operated by a lever 191 all pivoted on a shaft 130 supported in brackets integral with frame 121. The lever 191 is held by a spring-plunger in operative position with a hub 155 of the brake connected to shaft 1 by a spring-pin 57, and fine adjustment of shaft 1 is effected by an adjustable screw connection 200 between lever 121 and one of the arms 137. The rotary member of the disc brake consists of an annular disc 164 secured by screws to a flange on the hub 155, and the friction element is formed of a number of wooden pins 167, but may take other forms. The disc 164 to the pins rotate between a fixed annular part integral with the brake casing 147, and an adjustable stationary annular member integral with a convex member 181 adjustable by a screw 177 to vary the braking pressure. The member 181 is secured to the casing 147 by a key 184 and recesses 183 which prevent rotation of the member 181.