| 摘要 |
A rolling door error-start prevention device, comprising: a base plate provided at a lateral side of the upper rolling shaft accommodating chamber of rolling door; a rolling machine having a housing-base and a sprocket which drives said rolling shaft of the rolling door through a chain rolling, and which is fixed on the drive shaft; wherein said housing-base of the rolling machine is pivoted, in a swingable manner, to its upper position, at a base plate through a shaftpin, one or two slot(s) is (are) formed at a position below said base, and a guiding rod loosely passes through said slots and slidably pivots to said base; a tension spring, positioned oppositely to the direction of rotation of the rolling shaft, and applying a tension force onto lower portion of the housing-base of the rolling machine to maintain the base in a balanced condition; a sensor device, provided at the lower portion of the housing-base of the rolling machine, and used to detect the position of the base in such a manner that the sensor can switch off the power supply for a delay circuit and supply a reverse current to the rolling machine to rotate in reverse direction to cause the rolling door to descend back to its original position, when a deflection of the base due to the exceeding of torque load beyond a critical point is detected.
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