Gear reduction unit with anti-backlash mechanism

A method for gear reduction, the method comprising:

• providing a gear reduction assembly comprising:
• a fixed gear;
• an output gear coupled to an output shaft, wherein a number of teeth in the fixed gear and the output gear are different, wherein the fixed gear and the output gear are disposed in combination side-by-side;
• two transfer gears mesh with the fixed gear and the output gear, wherein the two transfer gears are coupled to an input shaft;
• and
• a drive plate of an elongated profile, the drive plate is integral with the input shaft, so that the drive plate rotates with the input shaft, and the two transfer gears are mounted to two shafts of the drive plate, the two shafts of the drive plate are spaced apart from each other, extends parallel to each other and perpendicular to the drive plate, the two transfer gears are freely rotatable relative to the drive plate;
• and
• rotating the input shaft.

An industrial robotic arm comprising:

• a gear reduction assembly comprising:
• a fixed gear;
• an output gear coupled to an output shaft, wherein a number of teeth in the fixed gear and the output gear are different, wherein the fixed gear and the output gear are disposed in combination side-by-side;
• two transfer gears mesh with the fixed gear and the output gear, wherein the two transfer gears are coupled to an input shaft,
• a drive plate of an elongated profile, the drive plate is integral with the input shaft, so that the drive plate rotates with the input shaft, and the two transfer gears are mounted to two shafts of the drive plate, the two shafts of the drive plate are spaced apart from each other, extends parallel to each other and perpendicular to the drive plate, the two transfer gears are freely rotatable relative to the drive plate.