POSITION CORRECTING UNIT OF TEST PIECE FOR TENSION TEST MACHINE AND TENSION TEST MACHINE EQUIPPED WITH POSITION CORRECTING UNIT OF TEST PIECE

PURPOSE: To set a test piece at a predetermined position on a stage by delivering a monitor signal, related to the position of the test piece mounted on the stage, to a control section thereby correcting the position of the test piece. CONSTITUTION: The lift 4 for a cassette 1 is elevated and a transfer arm 7 sucks 12 a test piece 2 from a test piece case 3. A transfer unit 6 moves along with the base end part 10 above a test piece stage 14 and the arm 7 transfers the test piece 2 onto the stage 14. A monitoring mechanism 19 disposed directly above the stage 14 monitors the position of the test piece 2 on the stage 14 using a monitor camera 19A having a square effective visual field defined within a circular visual field. Each critical position of the test piece 2 within the effective visual field is represented in the form of the difference from a reference point using a pixel signal which is then processed through a processing mechanism 19B to produce a numeric positional signal. The signal is delivered to the horizontal rotary mechanism and the horizontal moving mechanism supporting the stage 14 which is thereby moved to correct the difference thus setting the test piece 2 at a predetermined position.