| 摘要 |
A door machine mechanism for a rolling door has an electric machine mechanism, a brake mechanism and an output mechanism. In normal power supply condition, the rolling door is opened by the electric machine mechanism. In case of fire, the brake mechanism releases brake so that the rolling door moves downward by its own weight. However, in an emergency condition, if an external force is applied to push the door upward, the rolling door will be reopened by an assistance of spare electricity to the electric machine mechanism. |
| 主权项 |
1. A door machine mechanism (1) for a rolling door, comprising:
an electric machine mechanism (11) comprising a rotary shaft (110) for outputting power; a clutch mechanism (12) comprising a first clutch member (121) coaxially connected to said rotary shaft (110), and a second clutch member (122) connected to one end of an intermediate rotary shaft (110′), when said rotary shaft (110) is actuated to rotate with said first clutch member (121), said first clutch member (121) urges against said second clutch member (122) to rotate along therewith by centrifugal force; a brake mechanism (13) comprising a braking disc (131) fixedly connected with said intermediate rotary shaft (110′); a braked disc (132) coaxially mounted on said intermediate rotary shaft (110′) with said braking disc (131); and an electromagnetic disc (133) disposed on a periphery of said intermediate rotary shaft (110′) and connected to a housing of said electric machine mechanism (11); wherein said braked disc (132) is axially displaceable and spaced from said braking disc (131) by a spring piece (1321), and said electromagnetic disc (133) is spaced from said braked disc (132) by a gap; an output mechanism (16) comprising an output shaft (160), an output pulley (161) and an one-way transmission device (162), one end of said output shaft (160) being coupled to the other end of said intermediate rotary shaft (110′), said one-way transmission device (162) comprising an active member (1621) disposed on said output shaft (160) and having a plurality of wedge-shaped toothed grooves (1622) at a circumference thereof; a passive member (1623) comprising an out ring disposed on an outer periphery of said active member (1621) and configured to define a plurality of cavities between said passive member (1623) and said plurality of wedge-shaped toothed grooves (1622); and a plurality of wedging members (1624), each being received in one of said plurality of cavities; wherein said output pulley (161) being fixedly connected with said passive member (1623) and coupled to a winding shaft (A) for door slats (D), when said output pulley (161) rotates along with said passive member (1623) in a first predetermined direction (a), said output pulley (161) and said passive member (1623) being capable of rotating freely relative to said output shaft (160), and when said output shaft (160) rotates in a second predetermined direction (b), said plurality of wedging members (1624) are secured between said active member (1621) and said passive member (1623) and provide a wedging action, thereby urging said passive member (1623) to rotate with said output pulley (161); and a control circuit (E) electrically controlling with said electric machine mechanism (11) to actuate said rotary shaft (110) to drive said output shaft (160) so as to activate said winding shaft (A) to roll up or roll down the door slats (D), and when said electric machine mechanism (11) is deactivated, said electromagnetic disc (133) is excited to engage said braked disc (132), thereby forcing said braking disc (131) to brake said rotary shaft (110), wherein in the event of a power failure, said electromagnetic disc (133) disengages said braked disc (132), and said door slats (D) drop by gravity; when an upward lifting force (F) is applied on said door slats (D), said output pulley (161) is actuated to rotate in said second predetermined direction (b), thereby activating said winding shaft (A) to roll up said door slats (D). |
