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1.When the pre-tensioner is inactivated, the clearance between the roller and the sleeve is secured, and thus the sleeve rotates freely. The spool which winds the seat belt rotates together as with the sleeve.
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2.At the frontal collision, SRS-ECU which has detected the impact exceeding the threshold from the front impact sensors is energised to ignite the gas generator. Then the gas is generated, and the gas pressure moves up the piston.
3.When the piston moves up, the rack gear of the piston is engaged with the pinion gear of the pinion to rotate the pinion. When the pinion rotates, the pinion is tilted to move the roller to the centre, and the pinion, sleeve, and spool are incorporated.
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4.The gas pressure moves up the piston farther, and the pinion rotates the spool to wind the seat belt.
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