Belt drive system with adjustably gauged tightener means

In a belt drive system having support means, first and second parallel shafts journaled on the support means, first and second pulleys fixed respectively on the first and second shafts, a drive belt means trained about the pulleys, belt tightening means engaging a run of the belt and mounted on the support means for selective positioning to tension the belt between the pulleys, biasing means operative between the support means and the belt tightening means for urging the latter in a belt tightening direction, and means for adjusting the biasing means to vary the force thereon, the improvement comprising:

• first gauge means including a pair of members carried respectively by the support means and the belt tightening means, one of said members bearing indicia and the other having an indicator readable on the indicia to show the position of the belt tightening means, and the second gauge means including a second pair of members carried respectively by the support means and the adjusting means, one of said second pair of members bearing indicia to show the state of adjustment of the biasing means, said two gauge means being so coordinated that the two readings may be compared to designate the proper force on the biasing means according to the position of the belt tightening means.