Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1992-07-02
1994-06-14
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
192141, 310 41, 464160, F16H 2520, F16D 310
Patent
active
053199910
ABSTRACT:
A reversible drive system is provided that is particularly adaptable to low-power drives in which precision mechanical control must be obtained with the lowest possible cost and the highest reliability. The drive is described as incorporated in a lead screw drive in which a control nut reciprocates between two fixed positions. At the end of the movement in one direction, the control nut strikes a fixed abutment that stops the motion thereby increasing the load on the drive motor and causing an increase in the current drawn by the motor. This increase in current is utilized to disconnect the power source from the motor. In such systems, in particular where there is a large reduction in the speed between the motor and the driven object, as with the use of a lead screw drive arrangement, it is desirable to store energy at the end of each stroke that is available to decrease the starting torque required to reverse the direction of motion. To provide additional starting torque, the motor coupling includes a lost-motion coupling by which no significant load is placed on the motor until the output shaft of the motor, or an element driven by the motor, has moved through some fraction of a revolution. For most applications a lost-motion arrangement equivalent to about one hundred eighty degrees of motion is practical.
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