A chain slack is eliminated by supporting the entire return side with a guide rail and installing a take-up on the driven shaft. The chain may vibrate considerably due to the characteristic frequency of the chain, impact period of the driven shaft, or the polygonal action of the chain and sprocket. Therefore, it is a very important to install a guide shoe to prevent vibration. The width and length of the contact surface of the guide must be large enough for the chain link to pass.
Figure 1 Guide rail