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Electric screwdriver and a controller thereof

  • US 20070163357A1
  • Filed: 02/28/2007
  • Published: 07/19/2007
  • Est. Priority Date: 08/30/2004
  • Status: Active Grant
First Claim
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1. An electric screwdriver controller having a function for determining that a correct tightening operation has been carried out when said tightening operation has taken a time longer than a reference time, said controller comprising:

  • a torque monitoring means for monitoring whether or not a load torque in carrying out a tightening operation by using an electric screwdriver has reached a tightening completion torque indicating a completion of the tightening operation;

    a timer means for measuring a time interval from a starting time of the tightening operation to a time when the tightening torque has reached the tightening completion torque, as a tightening operation time; and

    a means for determining a reference time for a subsequent tightening operation based on a plurality of tightening operation times obtained from said timer means in the tightening operations carried out for a predetermined number of screws.

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