Patent ID: 7795880

Claim:
A detecting apparatus for checking at least one detected item of at least one electrically conductive fastener attached to a workpiece, comprising: a lower checking member configured to support the workpiece; an upper checking member movably set above the lower checking member; an electrical source; a processor; and an indicator; wherein at least one of the lower checking member and the upper checking member comprises at least one checking unit corresponding to the at least one detected item of the fastener, the at least one checking unit cooperates with the corresponding fastener to form a detecting circuit, the detecting circuit is connected to two electric poles of the electrical source, wherein the at least one checking unit is connected to one of the two electric poles and the corresponding fastener is connected to the other one of the two electric poles, a closed or open state of the detecting circuit exists depending on whether the at least one checking unit touches the corresponding fastener when the upper checking member abuts against the workpiece to close the detecting circuit and indicates whether the detected item is eligible or ineligible, the processor controls the indicator to show the checking result according to the closed or open state of the detecting circuit; wherein the fastener has a cylindrical shape, the checking unit comprises an electrically conductive checking sheath, the fastener enters a column-shaped space bounded by the checking sheath when the upper checking member abuts against the workpiece, the detected item is an accuracy of linearity and/or position of the fastener, a condition of ineligible of detected item is that a value of a deflection of linearity and/or position of the fastener is not less than an allowable tolerance of the accuracy of linearity and/or position of the fastener, an axis of the column-shaped space of the checking sheath and an axis of the fastener are in line when the accuracy of linearity and/or position of the fastener is eligible, a diameter of a cross-section of the column-shaped space is longer than a diameter of a cross-section of the fastener and a difference between the diameters is equal to the allowable tolerance, if the fastener touches with the checking sheath when the fastener enters the column-shaped space of the checking sheath, the detecting circuit closes and the accuracy of linearity and/or position of the fastener is ineligible, or if the fastener does not touch with the checking sheath when the fastener enters the column-shaped space of the checking sheath, the detecting circuit remains open and accuracy of linearity and/or position of the fastener is eligible.