Belt transmission mechanism and transfer robot including the same

A belt transmission mechanism comprising:

• a first pulley and a second pulley disposed rotatably about a pair of axes that are parallel to each other;
• a first steel belt including a first end attached to the first pulley and a second end attached to the second pulley and wound around the first pulley and the second pulley;
• a second steel belt including a third end attached to the first pulley and a fourth end attached to the second pulley, the second steel belt being spaced apart from the first steel belt in an axial direction of the first pulley and the second pulley, and wound around the first pulley and the second pulley with a winding direction thereof opposite from a winding direction of the first steel belt;
• a first cover;
• and
• a second cover;
• wherein
• the first pulley includes a first recess and a second recess that are recessed from an outer circumferential surface thereof,
• a first block member is fixed to the first end, the first block member being disposed in the first recess,
• the first cover is fixed to the first recess to enclose the first block member and includes a first outer circumferential surface having a same diameter as the outer circumferential surface of the first pulley,
• a second block member is fixed to the third end, the second block member being disposed in the second recess,
• the second cover is fixed to the second recess to enclose the second block member and includes a second outer circumferential surface having a same diameter as the outer circumferential surface of the first pulley, and
• at least one of the first cover and the second cover is provided with a belt tension adjuster capable of pushing a corresponding one of the first block member and the second block member toward a circumference of the first pulley.