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A seat belt retractor having a function of taking up a seat belt using a motor. A spool is fitted in a base frame such that a torsion bar functions as a shaft of the spool. Two gear-clutch casings are disposed on the left and right sides of the spool via a pretensioner and a locking mechanism, respe

A seat belt retractor having a function of taking up a seat belt using a motor. A spool is fitted in a base frame such that a torsion bar functions as a shaft of the spool. Two gear-clutch casings are disposed on the left and right sides of the spool via a pretensioner and a locking mechanism, respectively, wherein two motors are disposed to the gear-clutch casings, respectively. The two motors achieve respective functions which are different from each other and rotate at respective constant speeds.

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1. A seat belt retractor, comprising: a mechanism for taking up a portion of the seat belt by motor power; wherein the mechanism comprises two electric motors, each of the motors having a function different from the other motor; wherein one of the motors is attached to a first frame separate fr

1. A seat belt retractor, comprising: a mechanism for taking up a portion of the seat belt by motor power; wherein the mechanism comprises two electric motors, each of the motors having a function different from the other motor; wherein one of the motors is attached to a first frame separate from a second frame to which the other motor is attached, and wherein one of the two motors is configured to pretension the seat belt by causing the mechanism to rapidly retract the seat belt with such a strong tension as to restrain the occupant to a vehicle seat when the occurrence of a vehicle collision is predicted. 2. A seat belt retractor comprising: first and second motors, each motor being attached to a separate frame attached to a base frame on opposite ends of a spool, wherein the first motor is configured to pretension the seat belt by causing the mechanism to rapidly retract the seat belt with such a strong tension as to restrain the occupant to a vehicle seat when the occurrence of a vehicle collision is predicted; and wherein the second motor is configured to retract the seat belt to provide comfort to the occupant. 3. The seat belt retractor of claim 2, wherein the separate frames comprise gear clutch casings. 4. The seat belt retractor of claim 2, wherein the first and second motors are attached to the separate frames so that the motors project toward each other. 5. The seat belt retractor of claim 2, wherein the first and second motors are electric motors. 6. The retractor of claim 2, further comprising a spring configured to apply a force for taking up the seat belt. 7. A seat belt retractor comprising: a first and second motor, each motor configured to rotate at a respective constant speed and each motor having different functions, the first motor configured to provide a comforting function by withdrawing the seat belt to a position in which the seat belt tension does not put pressure on the occupant, the second motor is configured to pretension the seat belt by causing the mechanism to rapidly retract the seat belt with such a strong tension as to restrain the occupant to a vehicle seat when the occurrence of a vehicle collision is predicted. 8. The seat belt retractor of claim 7, wherein the first and second motors are electric motors. 9. The retractor of claim 8, further comprising a spring positioned and configured so that a force generated by the spring urges the retractor to take up the seat belt. 10. A seat belt retractor, comprising: a mechanism for taking up a portion of the seat belt by motor power, wherein the mechanism comprises two electric motors, each of the motors having a function different from the other motor, wherein one of the motors is attached to a first frame separate from a second frame to which the other motor is attached, and a seat belt pretensioner configured to pretension the seat belt by causing the seat belt to rapidly retract with a strong tension in order to restrain the occupant to a vehicle seat when the occurrence of a vehicle collision is predicted. 11. The retractor of claim 10, further comprising a spring configured to apply a force for taking up the seat belt.