A waste ink collecting device includes a ratchet wheel defining a receiving groove for receiving waste ink, a detent, a reciprocatingly movable transmission pole, and immovable first and second poles. The paper currency collection cabinet has a bottom sensor hole, and a slide moved to closeopen the sensor hole subject to the amount of paper currency collected. The delay circuit also includes a second delay stage that receives the delayed output signal of the first delay stage, and generates a delayed output signal from the output of the first delay stage. In one method of implantation, the superior and inferior implants may be aligned and coupled together with the coupler, and then secured to fixation members anchored in adjacent vertebrae.