Abstract: An improved take-up mechanism for a roll-up type screen, wherein the screen is pulled out to a desired length, and then by simple pulling and releasing, rolled up on the shaft. The shaft is automatically locked at the desired length of screen by engagement of a lock roller projected by a cam magnet. During pulling out operation, a magnet, a covering yoke and a cylinder disposed therebetween do not move with respect to each other, whereas during roll up operation under force of the wound up spring, the cylinder rotates under control of the magnetic field between the yoke and magnet to control the speed of roll up. The improvement comprises lock rollers on a cam magnet, one way clutches, roll holder, and ring lock for the rollers, together with the magnet to produce the above effects.

Abstract: The present invention relates to a screen take-up device characterized in that the output from the normal-reverse turn motor of outer-rotor type contained in a screen take-up shaft is transmitted to the take-up shaft after being reduced in speed; brake is applied by a braking mechanism on the inertia output from the motor in sync with the stopping of the aforementioned motor; the number of revolutions of the take-up shaft is counted by a counter and the motor is controlled to stop at the preset number of revolutions; and the output from the manual shaft which is manually rotated in normal-reverse way is transmitted to the take-up shaft through a self-locking mechanism after being reduced in speed.