Abstract: A programmable power transmission mechanism includes first and second torque output units, each of which has a primary driving gear. When a power source rotates an input gear in one direction, the two primary driving gears rotate in two opposite directions. At this time, a motor shaft of a small-size servomotor can rotate in a first direction so that torque is transmitted from the input gear to a rotating shaft via the first torque output unit. Alternatively, the motor shaft can rotate in a second direction that is opposite to the first direction so that torque is transmitted from the input gear to the rotating shaft via the second torque output unit. As such, the first and second torque output units can drive the rotating shaft to rotate in two opposite directions.

Abstract: A power transmission apparatus includes a sleeve assembly disposed rotatably around a stationary support shaft and having an annular surface unit that is formed with a plurality of axially extending slots. A plurality of rollers are confined respectively and rollably within the slots. A coiled torsional spring is disposed around the sleeve assembly, is spaced apart from the rollers, and is fastened to the driving gear at one end and to the driven gear at the other end. During rotation of a primary driving gear that is sleeved fixedly on the sleeve assembly, when a secondary driving gear rotates on the sleeve assembly, the spring is wound around the sleeve assembly so as to clamp the rollers between the spring and the sleeve assembly, thereby transmitting a torque from the primary driving gear to a driven gear on the support shaft.

Abstract: A programmable power transmission mechanism includes first and second torque output units, each of which has a primary driving gear. When a power source rotates an input gear in one direction, the two primary driving gears rotate in two opposite directions. At this time, a motor shaft of a small-size servomotor can rotate in a first direction so that torque is transmitted from the input gear to a rotating shaft via the first torque output unit. Alternatively, the motor shaft can rotate in a second direction that is opposite to the first direction so that torque is transmitted from the input gear to the rotating shaft via the second torque output unit. As such, the first and second torque output units can drive the rotating shaft to rotate in two opposite directions.

Abstract: A power transmission apparatus includes a sleeve assembly disposed rotatably around a stationary support shaft and having an annular surface unit that is formed with a plurality of axially extending slots. A plurality of rollers are confined respectively and rollably within the slots. A coiled torsional spring is disposed around the sleeve assembly, is spaced apart from the rollers, and is fastened to the driving gear at one end and to the driven gear at the other end. During rotation of a primary driving gear that is sleeved fixedly on the sleeve assembly, when a secondary driving gear rotates on the sleeve assembly, the spring is wound around the sleeve assembly so as to clamp the rollers between the spring and the sleeve assembly, thereby transmitting a torque from the primary driving gear to a driven gear on the support shaft.