Retractable band mechanism for cordless curtains

A retractable band mechanism for cordless curtains, wherein the cordless curtain comprises a parallelly disposed upper beam and lower beam, a plurality of slats arranged in parallel between the upper beam and the lower beam, and two retractable bands extending through the slats to connect the upper beam and the lower beam;

• the retractable band mechanism is disposed on the upper beam and the lower beam and is connected to the retractable bands for controlling the retraction and release of the two retractable bands, comprising:
• two sets of mounting components, each comprising a mounting base and a mounting block, wherein the two mounting bases are oppositely disposed at two ends of the upper beam, the two mounting blocks are oppositely disposed corresponding to the mounting bases at two ends of the lower beam, and each of the mounting blocks is provided with a first slot;
• two retractable band rollers, rotatable disposed on the mounting bases, each having a winding surface for winding the retractable band, and each of the winding surfaces is provided with a plurality of second slots;
• a plurality of clips, detachably inserted into the first slots and the second slots, each having a plurality of first engaging portions to correspondingly engage with a plurality of second engaging portions at the ends of the retractable bands to secure the ends of the retractable bands to the clips;
• and
• a drive-braking device disposed on the upper beam to control the retraction and release of the two retractable bands such that the lower beam may move upward or downward, the device comprising a shaft and an elastic braking unit connected to the shaft, wherein the shaft extends parallel to the slats and the upper and lower beams, the two ends of the shaft are connected to the two retractable band rollers, and the elastic braking unit generates an elastic braking force to control the rotation of the shaft.