Patent ID: 6900602

Claim:
A door opener error-start prevention device 10 , comprising: a base 4 ; a door opener 20 , one end of which has a mounting seat 21 that is mounted on said base 4 , and the other end of which accommodates a power unit 22 for outputting power; an output shaft 24 , a first end 24 a of which forms, from said end, an axially central hole 241 , and is mounted at center of an end gear 23 driven by said power unit 22 , a second end 24 b of which extends into said base, and is installed in said mounting seat 21 in a rotatable manner, and in which a pair of axial sliding slots 242 are formed in a manner that passes through said central hole 241 ; a sprocket assembly 25 which is connected to said second end 24 b of said output shaft 24 in a freely rotatable manner, one end of which comprises a sprocket 251 synchronously moving with a sprocket 51 on a rolling shaft 5 of a rolling door 1 through a chain 26 , and the other end of which is integrally formed with a sleeve 252 , a pair of V-shaped slots 253 being formed, in respect to sliding slots 242 on said output shaft 24 , in periphery of said sleeve 252 , a sliding pin 27 being radially inserted into said sliding slots 242 of said output shaft 24 , both ends of said sliding pin 27 protruding into said V-shaped slots of said sleeve 252 ; a compression spring 28 which passes through and is installed in said central hole 241 of said output shaft 24 , one end of which is mounted by means of a fastener 29 , and the other end of which abuts against said sliding pin 27 ; a swaying plate 30 which is installed beside said sliding pin 27 , one end 30 a of which is mounted on a mounting seat 21 of said door opener 20 , and the other end 30 b of which is a free end; and a switch device 31 which is installed beside said free end 30 b of said swaying plate 30 , in which when rotation of said door opener 20 is hindered, and said sliding pin 27 moves back toward a gradually larger opening, and compresses said swaying plate 30 , then a switch device 31 is triggered to switch off an electrical power for said circuit for rising said rolling door, and supplies a reverse current, so as to make said door opener 20 rotate in a reverse direction, and then make door plates descend and then return back to its original position.