| 摘要 |
PROBLEM TO BE SOLVED: To simply perform the setting and/or changing the upper and lower limit position of a screen by providing a position memorizing mechanism inside a roller of a motor-operated screen and by operating both the operation switches and position setting buttons. SOLUTION: Travelers 22, 22 screwed with a male thread portion of a shaft 21 interlocked with a roller R in a separable and contactual manner are penetrated through rising and descending guide shafts 221, 221 parallel to the shaft 22 in a movable manner and pressured and screwed with a pressure spring. Also, a position memory mechanism comprising a position setting button releasing the pressuring of the traveler 22, a reset spring 223 returning the traveler 22 to a predetermined initial position, and a macro switch stopping power supply only when the traveler 22 screws and moves with the shaft 21 is provided. By keep pressing ON operation and position setting buttons of rising and descending operation switches provided on the panel until the screen S reaches the desired position, the setting and/or change of the low limit position can be made easily.
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