The invention discloses an intermittent drive device for a
ratchet wheel. The intermittent drive device for the
ratchet wheel comprises a stand, a
ratchet wheel, a
control rod hinged to the stand, and a
cam, wherein the ratchet wheel is rotationally connected with the stand, a drive ring is arranged on one head face of the
cam along the circumferential direction, the middle of the
control rod is hinged to the stand, one end of the
control rod is propped against the
cam, the other end of the control rod is provided with two support rods, the angle between the two support rods is larger than the angle corresponding to a ratchet on the ratchet wheel, wherein one support rod is provided with a friction plate capable of contacting with the drive ring, and the other support rod is provided with a
brake ratchet. The friction plate is used for driving the ratchet wheel to move, and the
brake ratchet is used for braking the ratchet wheel. The friction plate is in surface contact with the drive ring on the ratchet wheel, compared with the
point contact of a pawl, the abrasion is small; the
brake ratchet does not need to rotate reciprocally on the ratchet wheel, the abrasion to the brake ratchet is small, and therefore, a user does not need to frequently change the friction plate and brake ratchet, and the
whole body has a longer working time.