| 摘要 |
PURPOSE:To automatically dispose an exposure unit horizontally by detecting the displacement of the structure of superposed members from the neutral position corresponding to the vertical axis of the structure, and horizontally returning it. CONSTITUTION:Assume that the horizontality of a horizontal detector is displaced in more than allowable amount so that the supporting height of an air damper 1a is, for example, increased in higher. If superposed members 23 moves by their own weight in a horizontal detector 19 to be disposed at the position designated by broken lines 23', a photoswitch 25c becomes OFF. Since at this time photoswitches 25a, 25b are respectively connected with solenoid valves, the solenoid valves of the damper 1c is opened by a signal from a switch 25c which became OFF, air is supplied into the damper 1c to pressurize the damper 1c, thereby rising its position. Thus, when the detector returns to the horizontal position, a yarn member 24 becomes perpendicular to the detector, the superposed member 33 becomes neutral with respect to the vertical axis of the structure to turn ON the switch 25c. As a result, the damper 1c is closed so that the printing exposure unit is returned to the horizontal position. |
