Bi-directional band saw and dual-blade tensioner assembly

A band saw assembly, comprising:

• a drive wheel, a first wheel, and a second wheel;
• a first blade driven by said drive wheel and carried by said first wheel, and a second blade driven by said drive wheel and carried by said second wheel;
• and
• a blade tensioner assembly comprising a shaft, a first actuator, and a second actuator, said shaft having a first section and a second section, said second section possessing eccentricity with respect to said first section, said first wheel situated at said first section and said second wheel situated at said second section, said first actuator having a first movement transmission connection with said shaft, said second actuator having a second movement transmission connection with said shaft, actuation of said first actuator imparting linear movement to said shaft and to said first and second wheels and furnishing tension to at least said first blade, and actuation of said second actuator imparting rotational movement to said shaft and furnishing tension to said second blade via the eccentricity of said second section with respect to said first section.