| 摘要 |
PURPOSE:To improve the replacement and maintenance workability of an operation head unit, by mounting the operation head unit and a preparatory head unit to a head unit mounting stand so as to make it possible to transfer and mount both of them to a predetermined position. CONSTITUTION:A head unit press plate 5 is pressed to a direction compressing a spring 7 and projections 4 of an operation head unit 2 and a preparatory head unit 3 are inserted into the grooves 1-1 of a mounting stand while slid along said grooves and the operation head unit 2 is pressed to a close contact surface 11 by the spring 7. The operation head unit 2 is also pressed to a close contact surface 12 by a spring 8. |
