Abstract: An actuator control system includes a motorized joint having first and second members rotatable relative to one another. An actuator is coupled with the motorized joint and is configured to rotate the first member relative to the second member in response to an input including a voltage, a current, or any combination thereof. A controller is coupled with the actuator and is configured to control the input using a control algorithm. The control algorithm controls the input based upon a mathematical model of biological muscle actuation that models titin as a filament which winds around actin during muscle actuation. In implementations the mathematical model includes mathematical representations of a contractile element, a viscous damping element in parallel with the contractile element, and a spring in series with the contractile element through a pulley and simultaneously in parallel with the contractile element.

Abstract: An actuator control system includes a motorized joint having first and second members rotatable relative to one another. An actuator is coupled with the motorized joint and is configured to rotate the first member relative to the second member in response to an input including a voltage, a current, or any combination thereof. A controller is coupled with the actuator and is configured to control the input using a control algorithm. The control algorithm controls the input based upon a mathematical model of biological muscle actuation that models titin as a filament which winds around actin during muscle actuation. In implementations the mathematical model includes mathematical representations of a contractile element, a viscous damping element in parallel with the contractile element, and a spring in series with the contractile element through a pulley and simultaneously in parallel with the contractile element.

Abstract: An automatic feeder unit for a twin or triple needle bottom cover stitch machine which allows hemmed garments to be chained off while being sewn automatically. The feed unit comprises a top feed conveyor coupled to a synchronizer which senses the speed of the main shaft of the sewing head to control the speed of the top feed conveyor in relation to the speed of the sewing head. Further a feed dog and throat plate assembly comprises an extended land area beyond the chaining finger and having a slot located therebeyond through which a feed dog protrudes during operation, to thereby retain the chain stitch during chaining off.