Band saw machine capable of detecting tension of saw band

A band saw machine comprising:

• a base including a straight post, an upper wheel case connected with the straight post, and a lower wheel case connected with the straight post and spaced from the upper wheel case;
• a sawing unit including an upper axle vertically movably disposed in the upper wheel case, an upper wheel rotatably connected to the upper axle and having a wheel portion, a shaft portion, and a plurality of spokes connected with the wheel portion and the shaft portion, a lower axle disposed in the lower wheel case, a lower wheel rotatably connected to the lower axle, and a saw band wound around the upper wheel and the lower wheel;
• a tension adjustment unit disposed to the base and connected to the upper axle for pushing the upper axle to move upwards;
• and
• a tension detector disposed to one of the spokes and detecting a minor deformation of the corresponding spoke.

A band saw machine comprising:

• a base including a straight post, an upper wheel case connected with the straight post, and a lower wheel case connected with the straight post and spaced from the upper wheel case:
• a sawing unit including an upper axle vertically movably disposed in the upper wheel case, an upper wheel rotatably connected to the upper axle, a lower axle disposed in the lower wheel case, a lower wheel rotatably connected to the lower axle, and a saw band wound around the upper wheel and the lower wheel;
• a tension adjustment unit disposed to the base and connected to the upper axle for pushing the upper axle to move upwards;
• and
• a tension detector disposed to the lower axle and detecting a minor deformation of the lower axle.