Door operator device and sectional overhead door system with anti-pressure and anti-theft functions

A sectional overhead door system with anti-pressure and anti-theft functions, comprising a shaft, a torsional spring, two cable drums, at least one slat, two cables, and a door operator device, wherein the torsional spring is used to preload a specific torsion force on the shaft;

• the two cable drums are disposed on the two ends of the shaft, one end of each of the two cables is connected to one of the two cable drums respectively, and the other end of each of the two cables is connected to one of the two sides of the at least one slat respectively;
• the door operator device is kinematically connected to the shaft and includes a reduction gear and a ratchet-locking device;
• an input end of the reduction gear is kinematically connected to an input shaft, and an output end of the reduction gear is kinematically connected to the shaft;
• the reduction gear includes a ratchet on its the outer circumference;
• the ratchet-locking device is controlled to selectively lock or unlock the ratchet,
• wherein when the sectional overhead door system stops operating, the ratchet-locking device is controlled to lock the ratchet, and the shaft cannot drive the input shaft through the reduction gear,
• wherein when the sectional overhead door system starts to operate, the ratchet-locking device is controlled to unlock the ratchet, and if the input shaft drives the shaft through the reduction gear during the descent of the at least one slat, and the shaft decelerates, stops, or reverses, the ratchet and the input shaft are in idle rotation,
• wherein the reduction gear further includes an input gear and an output disc;
• the input gear is eccentrically connected to the input shaft and includes a plurality of axial through holes;
• the ratchet is an annular ratchet, includes a plurality of teeth on its outer circumference, and includes an inner gear on its inner circumference;
• the input gear is accommodated in the inner circumference of the ratchet and engages with the inner gear, and the number of teeth of the inner gear is greater than the number of teeth of the input gear;
• the output disc includes a plurality of axial pins, which are inserted in the plurality of axial through holes of the input gear respectively, and the diameter of each axial through hole is larger than the diameter of each axial pin;
• the output disc is kinematically connected to the shaft.