| 摘要 |
<p>A method of measuring of backlash arising in a drive mechanism comprising a screw and a nut device co-operating with the screw, the nut device being connected to a movable unit which is displaceable in opposite directions along the screw. The drive mechanism comprises a pulse generating means, of which the number of pulses emitted for each displacement corresponds to the distance run. In accordance with the method the movable unit is operated to move away from an end position adjacent one end of the screw, and when a predetermined position has been reached the pulse counting means is reset while the movement continues. The movement is maintained a distance beyond the position in which the pulse counting means was reset, the said distance being greater than the possible maximum backlash. The drive mechanism is then stopped and operated to move the movable unit back to the end position, during which movement the pulse counting means is counting backwards. Upon arrival of the movable unit in the position in which the pulse counting means was reset, the counting is stopped and the absolute value remaining in the pulse counting means will be a measure of the backlash. The invention also comprises a device for performing the method, the device including a control device, preferably a microprocessor, for operating the various means, such as drive mechanism, pulse emitting means, pulse counting means etc., in carrying out the different method steps.</p> |
