Patent ID: 8650768

Claim:
A testing device for testing whether planeness of a top surface and a bottom surface of an object is within an allowable range, comprising: a rack; a motion mechanism slidably mounted on the rack to support the object, the motion mechanism comprising a slide member defining an opening; a transmission mechanism fastened to the rack and connected to the motion mechanism; a control mechanism controlling the transmission mechanism to operate, thereby driving the motion mechanism to slide along the rack; a testing mechanism fastened on the rack and comprising two rows of sensors electrically connected to the control mechanism, the rows of sensors spaced apart from each other, between which the object is operable to extend through with the slide member; and a display connected to the control mechanism; wherein when the object extends through the rows of sensors, the sensors above the object respectively measure distances between the sensors above the object and corresponding dots of the top surface of the object, and the sensors below the workpiece respectively measure distances between the sensors below the object and corresponding dots of the bottom surface of the object, the sensors send signals about the distances to the control mechanism, the control mechanism determines whether planeness of the top and bottom surfaces of the object is within an allowable range, the control mechanism further controls the display to display the determination result.