Shaft A of paper reel 1 is supported by rollers 2 mounted on brackets 3. Paper strip a runs over roll 4 and passes guide rolls to printing roller 5. Roll 4 is mounted on frame 7 which turns about fixed axis B secured between the side-walls of the device. Due to the weitght of frame 7, paper strip a is unwound from reel 1. As the strip unwinds, roll 4 descends and frame 7 lowers brake shoe 6, connected to the frame by tie-rod 8. When the tension of the paper strip increases, roll 4 is raised slightly, decreasing the friction between shoe 6 and brake disk 9 so that some more paper is unwound from the reel.
$1974$FL,SF$