Instrument and method for measuring pluck resistance of fastener members

A method for measuring the pluck resistance of fastener members using a measuring instrument which comprises holder means for holding a fabric of a garment to which a fastener member is attached, securely around the fastener member, a plurality of clamp members capable of clamping the fastener member and moving in the direction normal to the surface of the fabric where the fastener member is attached to the fabric, and tension detecting means for measuring the tensile force that is applied to the clamp members, wherein said holder means is supported by lift means, said tension detecting means comprises a member providing a fulcrum, a mass lever pivotally supported at the fulcrum and a tension detector, said mass lever being coupled at one end to said clamp members and adapted to act on the tension detector at the other end, said method comprising the steps of (1) starting the lift means to lower the holder means, (2) judging whether the force on the load cell is below the reference value or not, (3) judging, if the force is below the reference value, whether the holder means has reached the lower limit position or not and, if it has not yet reached the lower limit position, repeating the above step (2), (4) reporting that the test piece has passed the inspection if the reference value is exceeded in the step (2), and reporting that the test piece has failed if the lower limit position is reached in the step (3).

A method for measuring the pluck resistance of fastener members using a measuring instrument which includes holder means for holding a fabric of a garment to which a fastener member is attached, securely around the fastener member, a plurality of clamp members capable of clamping the fastener member and moving in the direction normal to the surface of the fabric where the fastener member is attached to the fabric, and tension detecting means for measuring the tensile force that is applied to the clamp members, wherein said holder means is supported by lift means, said tension detecting means comprises a member providing a fulcrum, a mass lever pivotally supported at the fulcrum and a tension detector, said mass lever being coupled at one end to said clamp members and adapted to act on the tension detector at the other end, said method comprising the steps of (1) starting the lift means to lower the holder means, (2) judging whether the force on the tension detector is at or above the reference value or not, (3) judging, if the force is below the reference value, whether the holder means has reached the lower limit position or not and, if it has not yet reached the lower limit position, repeating the above step (2), (4) starting timing if the reference value is reached or exceeded in the step (2), judging again whether the force on the tension detector is at or above the reference value or not, and, if the force is at or above the reference value, reporting that the test piece has passed the inspection when the timing has reached a reference time, and (5) reporting that the test piece has failed if the lower limit position is reached in the step (3).