Patent Publication Number: US-8985181-B2

Title: Machine mechanism of a rolling door operator

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a rolling door operator, and particularly to a machine mechanism of a rolling door operator for a fireproof rolling door, wherein a curtain of fire proof the rolling door can automatically fall down to close the fireproof rolling door in a power failure, or if necessary, for example, in an emergency escape, the fireproof rolling door can be opened by rotating a pull-chain disc through manually pulling a pull-chain. 
     2. Description of the Related Art 
     A so-called fireproof type of rolling door operator is used to close a fireproof rolling door immediately once in a power failure, no matter what causes the power failure. Even though a fire accident occurs in the case of no power failure, the power can be cut off by a fire control device, such as a smoke detector, a temperature sensor, other fire alarm detecting devices, or the like, so that a curtain of the fireproof rolling door can fall down to shut the fireproof rolling door based on its own weight. As a result, fire or smoke can be blocked from escape immediately at the first time when the fire accident occurs. This type of door operator generally does not install a manual pull-chain disc means, because the pull-chain disc means not only hinder the curtain of the fireproof rolling door to fall down freely, but also increases the complexity of the rolling door operator. However, in order to be adapted to an emergency escape or keep a personnel access in a power failure caused by a non-fire accident, this type of rolling door operator generally installs a back-up power for the benefit of opening the fireproof rolling door urgently. However, it is known to those skilled in the art that the back-up power should be maintained frequently to ensure that it is kept in a good condition ready to be used under an emergency. 
     It is known that a number of related patent documents, for example, U.S. Pat. Nos. 5,203,392, 5,245,879, 5,355,927, 5,605,185, and 5,893,234 have disclosed this type of rolling door operator for closing fireproof rolling doors. 
     On the other hand, rolling door operators according to their purposes and functions are generalized as a fireproof type of warehouse door, a safety type of commercial escape door and a standard type of general residence, etc. Each of the fireproof type, the safety type, and the standard type of rolling door operators is further classified into an electric type and a manual type. For a rolling door operator manufacturing industry, it must develop a number of types of rolling door operators having various control ways to meet requirements for different uses. Consequently, needed are a variety of production processes and more parts which renders stock cost and production cost relatively high. 
     SUMMARY OF THE INVENTION 
     A main objective of the present invention is to provide a rolling door operator for a fireproof rolling door capable of being manually implemented to open the fireproof rolling door in an emergency case, so that the disadvantage concerned with a rolling door operator for a prior art fireproof rolling door having no manual mechanism can be overcome. 
     To achieve the above objective and other objectives, the rolling door operator having the machine mechanism according to the present invention comprises a housing for accommodating an electric motor mechanism, a first electromagnetic clutch mechanism, a combination of pull-chain disc and brake, a second electromagnetic clutch mechanism, and a centrifugal brake mechanism in sequence, wherein the electric motor mechanism has a central rotating shaft to be rotated by the motor, and its rotation is transmitted to an output wheel fixed on an output shaft at least via a first rotating shaft and a second rotating shaft coupling to each other, and hence the output wheel rotates a winding shaft through, for example, a chain; a hollow shaft bears on the right side of the first rotating shaft to be slided axially thereon; the first electromagnetic clutch mechanism is fitted over the right side of the hollow shaft, and is controlled to separate the hollow shaft from the central rotating shaft when the electric motor mechanism rotates, or to connect them together when the electric motor mechanism stops rotating; the combination of pull-chain disc and brake, fitted over the first rotating shaft at a position between the two ends thereof, is comprised of a pull-chain disc device and a brake device; wherein the pull-chain disc device comprising a pull-chain disc, around which a pull-chain runs and inside which there is an axial space functioning as an accommodating portion for accommodating the brake device therein, and wherein the braking device being located on the left side of the hollow shaft and comprising a shaft hub secured on the housing, and one or more torsional springs being fitted over the shaft hubs in a way that when the torsional spring is twisted by a torsion force from the hollow shaft, the torsional spring is actuated to shrink its inner diameter and constrict the shaft hub, which results in the central rotating shaft being in a braking state; and when the torsional spring is actuated by rotating the pull-chain disc, its inner diameter is enlarged so as to loosen its constriction from the shaft hub, which results in the brake being released; and the second electromagnetic clutch mechanism is fitted over the first rotating shaft at the left side thereof and neighbors on the right side of the second rotating shaft, so that the first rotating shaft is constantly coupled with the second rotating shaft together. 
     According to the rolling door operator of the present invention, when a curtain of the fireproof rolling door is wound up to open the fireproof rolling door, at least part of the gravity weight of the curtain of the fireproof rolling door always acts on the output wheel which transmits to the hollow shaft and renders and hollow shaft to have a tendency to actuate on the torsional spring to shrink its inner diameter so as to stop the central rotating shaft from rotating, that is, the rolling door operator is in a brake state; and when an electric power is in failure, the second electromagnetic clutch mechanism will fail to make the first rotating shaft couple with the second rotating shaft, so that the curtain of fireproof the rolling door falls down freely to close the fireproof rolling door by its own weight. On the other hand, based on the fact that the second electromagnetic clutch mechanism is provided with an electrical energy storage device (for example, a small size battery) for controlling a coupling of the first rotating shaft with the second rotating shaft, the torsional spring can be actuated to enlarge its diameter by rotating the pull-chain disc with the pull-chain. Hence, the torsion spring brake is released with the hollow shaft to be allowed to rotate the central rotating shaft to open the fireproof rolling door for the purpose of an emergency escape. 
     According to the fireproof rolling door operator of the present invention, the electric motor mechanism and the combination of pull-chain disc and brake are detachably connected together by the first electromagnetic clutch mechanism. Hence, in the case of detaching the electric motor mechanism during maintenance, even in the case of the electric motor mechanism being out of order, the rolling door operator can still be operated to open/close the fireproof rolling door in a manual mode through the combination pull-chain disc and brake, to keep personnel normal access. 
     According to the rolling door operator of the present invention, each mechanism of the rolling door operator has good compatibility with each other in constructions. For example, if the electric motor mechanism and the first electromagnetic clutch mechanism are omitted from the rolling door operator, the rolling door operator becomes a manual rolling door operator. Also, for example, if the second electromagnetic clutch mechanism and the centrifugal braking mechanism are omitted from the rolling door operator, the fireproof rolling door operator becomes a general standard electric door operator. Furthermore, for example, if the electric motor mechanism, the first electromagnetic clutch mechanism, the second electromagnetic clutch mechanism, and the centrifugal brake mechanism are omitted from the rolling door operator, the rolling door operator becomes a general standard manual door operator. As such, without increase of extra cost, more types of rolling door operators with various control ways are constructed. Accordingly, the stock cost is also relatively reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross-sectional view showing a machine mechanism of a rolling door operator of the present invention. 
         FIG. 1   a  is a partly enlarged view of a circled portion “A” in  FIG. 1 , showing that a first electromagnetic clutch mechanism is in a magnetically excited state (i.e. separate state). 
         FIG. 1   b  is a partly enlarged view of a circled portion “B” in  FIG. 1 , showing that a second electromagnetic clutch mechanism is in a magnetically excited state (i.e. coupling state). 
         FIG. 2  is a partly enlarged cross-sectional view from  FIG. 1 , showing the machine mechanism of the rolling door operator of the present invention. 
         FIG. 2   a  is a partly enlarged view of a circled portion “A” in  FIG. 2 , showing that a first electromagnetic clutch mechanism is in a non-magnetically excited state (i.e. in a coupling state). 
         FIG. 2   b  is a partly enlarged view of a circled portion “B” in  FIG. 2 , showing that the second electromagnetic clutch mechanism is in a non-magnetically excited state (i.e. in a separate state). 
         FIG. 3  is a perspective view showing a combination pull-chain disc and brake of the present invention, wherein other mechanisms are omitted. 
         FIG. 3   a  is a perspective view showing the combination pull-chain disc and brake of  FIG. 3  in a separate state. 
         FIG. 3   b  is a perspective view showing a brake device of the combination pull-chain disc and brake of  FIG. 3 , from which a pull-chain disc is already detached. 
         FIG. 3   c  is a perspective view showing a torsional spring of the present invention. 
         FIG. 4  is a cross-sectional view showing the combination pull-chain disc and brake of the present invention, wherein other mechanisms are omitted. 
         FIG. 4   a  is a cross-sectional view along line  4   a - 4   a  of  FIG. 4 . 
         FIG. 5  is another modified example of a machine mechanism of a rolling door operator of the present invention, showing a manual rolling door operator for a fireproof rolling door. 
         FIG. 6  is a further modified example of a machine mechanism of a rolling door operator of the present invention, showing a standard electric door operator. 
         FIG. 7  is still a further modified example of a machine mechanism of a rolling door operator of the present invention, showing a standard manual rolling door operator. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, the technical features of the present invention are further described in cooperation with embodiments. The embodiments are preferred examples only and are not used to limit the scope of implementation of the present invention. It is better understood from the following detailed description with reference to accompanying drawings. 
     First, please referring to  FIGS. 1 and 2 , a machine mechanism of a rolling door operator of the present invention is applied to an electric rolling door operator for a fireproof rolling door. The machine mechanism  1  of the rolling door operator according to the present invention is used to automatically unwind a curtain of the fireproof rolling door wound on a winding shaft (not shown) to close a door when electrical power is in failure. The machine mechanism is comprised of an electric motor mechanism  20 , a first electromagnetic clutch mechanism  30 , a combination of pull-chain disc and brake  40 , a second electromagnetic clutch mechanism  60 , which are accommodated in a housing  10 . A first rotating shaft  13  passes through the first electromagnetic clutch mechanism  30 , the combination pull-chain disc and brake  40 , and the second electromagnetic clutch mechanism  60 , in which a right end portion of the first rotating shaft  13  is detachably connected to a central rotating shaft  11  of the electric motor mechanism  20 , and a left end portion f the first rotating shaft  13  is connected to a second rotating shaft  17  via the second electromagnetic clutch mechanism  60 , so that mechanical turning induced from the electric motor mechanism  20  or manual turning induced from the combination pull-chain disc and brake  40  can be transmitted to an output shaft  19 , and then the winding shaft (not shown) is rotated by an output wheel  191  fixed on the output shaft  19 . 
     A hollow shaft  15  is slidably sleeved on the first rotating shaft  13  at a right side portion thereof. The first electromagnetic clutch mechanism  30  is disposed on a right side portion of the hollow shaft  15  over a periphery of the hollow shaft  15  and fixed to the housing  10 . When the electric motor mechanism  20  is electrically powered, the first electromagnetic clutch mechanism  30  makes the hollow shaft  15  slide to separate from the central rotating shaft  11 . After stopping electrically powering the electric motor mechanism  20 , both of the central rotating shaft  11  and the hollow shaft  15  are connected to each other again. 
     The combination pull-chain disc and brake  40  is disposed over the first rotating shaft  13  between two ends of the first rotating shaft  13 , and comprises a pull-chain disc device  41  and a brake device  50 . The pull-chain disc device  41  comprises an end disc  531 , to which a left end side of the hollow shaft  15  is axially and slidably connected. A pull-chain disc  41 ′, which is supported on the end disc  531 , can be rotated by a pull-chain  42  running on an outer periphery of the pull-chain disc  41 ′, to drive the end disc  531  to rotate together with the hollow shaft  15 . Inside the pull-chain disc  41 ′, there is an axial, left end-opened, ring-like space as an accommodating portion  410 . The brake device  50  is accommodated in this accommodating portion  410 . The brake device  50  comprises a shaft hub  53  secured on the housing  10  and at least one torsional spring  51  bears on a circumference of the shaft hub  53 . The torsional spring  51  can be twisted along with the rotation of the hollow shaft  15  and the end disc  531  to reduce its inner diameter so as to constrict the circumference of the shaft hub  53  and result in the central rotating shaft  11  in a brake state; or the torsional spring  51  can be detwisted by the rotation of the pull-chain disc  41 ′ to enlarge its inner diameter so as to release the shaft hub  53  and result in the central rotating shaft  11  in a unbraked state. 
     The second electromagnetic clutch mechanism  60  is disposed and secured between the left side portion of the first rotating shaft  13  and a right side portion of the second rotating shaft  17 , which is opposite to the first rotating shaft  13 , and is used to constantly couple the first rotating shaft with the second rotating shaft together in normal power supply or make them separate in power failure. 
     A control circuit comprises an electric energy storage device (not shown), which is used to electrically power the second electromagnetic clutch mechanism  60  as a power is in failure. 
     So, in normal power supply, the rotation of the central rotating shaft  11  generated by the electric motor mechanism  20  is transmitted to the output shaft  19  and the output wheel  191 , so that the curtain of the rolling door is wound around the winding shaft to open the door. Based on the fact that the weight of the curtain of the rolling door always acts on the output wheel  191  to actuate the torsional spring  51  through the hollow shaft  15  and the end disc  531 , the inner diameter of the tossional spring  51  is reduced, and hence the torsional spring  51  always constricts the shaft hub  53 , which results in keeping the central rotating shaft  11  in a brake state. However, in power failure state, the second electromagnetic clutch mechanism  60  makes the first rotating shaft  13  and the second rotating shaft  17  separate, so that the curtain of the rolling door falls down closed by the weight of the curtain of its own. And, in the case of emergency escape, the electric power energy device electrically powers the second electromagnetic clutch mechanism  60  to keep the first rotating shaft  13  couple the second rotating shaft  17 . The torsional spring  51  can be actuated by rotating the pull-chain disc  41 ′ with the pull-chain  42  to enlarge the inner diameter of the torsional spring  51 , hence release its brake. Thereby, through a exertion of force on the pull-chain  42  for running the pull-chain disc  41 ′, the hollow shaft  15  is rotated by the pull-chain disc  41 , with the central rotating shaft  11  turned together, and such a rotation movement is transmitted through the first rotating shaft  13  and the second rotating shaft  17  to the output wheel  191  to wind up the curtain of the rolling door. 
     According the present invention, the housing  10  at least comprises a first partition plate  10   a , a second partition plate  10   b , and a third partition plate  10   c , which are interposed between the electric motor mechanism  20  and the first electromagnetic clutch mechanism  30 , between the first electromagnetic clutch mechanism  30  and the combination pull-chain disc and brake  40 , and between the combination pull-chain disc and brake  40  and the second electromagnetic clutch mechanism  60 , respectively. A first bush  12  axially holds the central rotating shaft  11  and the first rotating shaft  13  together. A right side portion of the first bush  12  is born on the first partition plate  10   a , and a left side portion of the first bush  12  is formed with an end disc  121 . A brake shoe  122  is secured on a left end face of the end disc  121 . 
     The first electromagnetic clutch mechanism  30  comprises a first electromagnet  301 , secured on the second partition plate  10   b  opposite to the end disc  121 . On the second partition plate  10   b , an axial guidance sleeve  101  is formed. An accommodating portion is formed for accommodating an elastic element  303  between an outer circumference of the guidance portion  101  and an inner circumference of the first electromagnet  301 . 
     The hollow shaft  15  passes through the guidance sleeve  101  and is guided to be slidable axially. A brake disc  151  is secured on a right end portion of the hollow shaft  15  to the effect that it is located between the first electromagnet  301  and the end disc  121 . The brake disc  151  is always exerted by the elastic element  303  to abut against the brake shoe  122  of the end disc  121  for the purpose that the hollow shaft  15  is coupled with the central rotating shaft  11 . When the central rotating shaft  11  is rotated by the electric motor mechanism  20 , the first electromagnet  301  is magnetically excited simultaneously, and the brake disc  151  is attracted to resist against the biasing force of the elastic element  303 , so as to make the hollow shaft  15  slide to release the coupling of the brake disc  151  with the end disc  121  (referring to  FIG. 1   a ). Hence, the hollow shaft  15  is separate from the central rotating shaft  11 . At this time, the rotation of the central rotating shaft  11  can drive the first rotating shaft  13  directly. On the other hand, when the central rotating shaft  11  stops rotating, the first electromagnet  301  which is not magnetically excited now makes the hollow shaft  15  couple with the central rotating shaft  11  again (referring to  FIG. 2   a ). 
     Referring to  FIGS. 3 to 4   a , on a right side surface of the accommodating portion  410  of the pull-chain disc  41 ′, there is a partition plate  411 . A protrudent pin  412  is secured at a point of a predetermined radius on the partition plate  411 . One left end of the protrudent pin  412  protrudes axially from the left side of the partition plate  411  into the accommodating portion  410 , and the other end of the protrudent pin  412  extends from the right side of the partition plate  411  to form an extending end  412   a . The hub  53  is comprised of a pair of inner hub  53   a  and outer hub  53   b , wherein the inner hub  53   a  is pentrated the partition plate  411  and pivoted on it, and within the accommodating portion  410 , the outer hub  53   b  is sleeved on the inner hub  53   a . On a center portion of the inner hub  53   a , there is a square match bore  532 , and the left side end portion  152  of the hollow shaft  15  is shaped in a square shape, so that the square end  152  can be slidably engaged with the square match bore  532 . The end disc  531  is located on the right side of inner hub  53   a  and opposite to the right side of the partition plate  411 . On the end face of the end disc  531 , there is a circular slot  5311  with a predetermined arc length which is formed at a predetermined radius correspondent to the radial position of the protrudent pin  412  in order to receive the extending end  412   a  in the circular slot  5311  (referring to  FIGS. 3 and 4 ). The left side of the outer hub  53   b  is fixed on the third partition plate  10   c . A movable disc  533  is pivoted on the outer hub  53   b  to rotate around it. The torsional spring  51  positioned at the right side of the movable disc  533  and constricts the outer hub  53   b . The two ends of the torsional spring  51  are free ends, staggered with a predetermined distance and formed with two protrudent portions  511 ,  511 ′, respectively, which protrude outwards in a radial direction. The protrudent portions  511 ,  511 ′ have twisting direction sides “a” and detwisting direction sides “b”, respectively (referring to  FIG. 3   c ). A pair of bolt pieces  535 ,  535 ,′ from the end disc  531  of the inner hub  53   a , go through the partition plate  411  and pass by outsides of the two protrudent portions  511 ,  511 ′ of the torsional spring  51  at predetermined positions which are outside the two ends of the circular slot  5311 , respectively, and then are fixed on the movable disc  533 . That is to say, the pair of bolt pieces  535 ,  535 ′ are located opposite to the twisting direction sides “a” of the protrudent portions  511 ,  511 ′, respectively, and the protrudent pin  412  is located between the detwisting direction sides “b” of the protrudent portions  511 ,  511 ′ (referring to  FIGS. 3   b  and  4   a ). Two through circular slots  413  and  413 ′ corresponding to the bolt pieces  535  and  535 ′ are formed to allow the bolt pieces  535  and  535 ′ to pass through freely and function as moving paths for the bolt pieces  535  and  535 ′ during their turning with the end disc  531  (referring to  FIG. 3   a ). 
     Furthermore, as shown in  FIGS. 1 and 2 , the second electromagnetic clutch mechanism  60  comprised of a second electromagnet  601  is fixed on the third partition plate  10   c  in which a driving disc  602  is pivoted around the second electromagnet  601  at the left side thereof and fixed together with the left end portion of the first rotating shaft  13 . A second bush  14  is secured to the second rotating shaft  17  between the two ends of the second rotating shaft  17 , the right end of the second bush  14  is formed with a driven disc  141  facing to the driving disc  602 , wherein a brake shoe  142  is located between the driving disc  602  and the driven disc  141 . The brake shoe  142  is biased by an elastic plate  143  connected to the driven disc  141 , so that the brake shoe  142  always comes into contact with the driven disc  14 . A right end portion of the second rotating shaft  17  is pivoted on the driving disc  602 , and a left end portion of the second rotating shaft  17  is connected to the output shaft  19  via a train of the gears  801 ,  801 ′ of a speed reduction mechanism. In the case of normal power supply, the second electromagnet  601  is magnetically excited, and the brake shoe  142  is attracted to the driving disc  602  by resisting against the elasticity of the elastic plate  143 , so as to make the first rotating shaft  13  and the second rotating shaft  17  constantly come into contact with each other (referring to  FIG. 1   b ); in the other hand, in the case that the second electromagnet  601  is electrically powered off, the second rotating shaft  17  and the first rotating shaft  13  are separate from each other (referring to  FIG. 2   b ), so that the curtain of the fireproof rolling door falls down by its own weight. Moreover, there is a centrifugal braking mechanism  70  disposed around the outer periphery of the second bush  14  for controlling the falling speed of the curtain. The centrifugal braking mechanism  70  is run along with the turning of the second bush  14 , and hence a centrifugal force is accompanied. When the falling speed of the curtain is over a predetermined value, a friction force exerts on an inner surface against the housing  10  with an effect to limit the rotating speed of the second bush  14 , and hence controls the falling speed of the rolling door. 
     According to the present invention, the above electric energy storage device (for example, a storage cell) has stored electric energy in peacetime. 
     In the case of normal power supply, the control circuit controls the second electromagnet  601  of the second electromagnetic clutch mechanism  60  to be magnetically exited, hence the first rotating shaft  13  and the second rotating shaft  17  constantly connect each other (referring to  FIG. 1   b ), as explained above; and after the electric motor mechanism  20  is rotated, it controls the first electromagnet  301  of the first electromagnetic clutch mechanism  30  to be magnetically excited simultaneously, so as to make the hollow shaft  15  separate from the central rotating shaft  11  (referring  FIG. 1   a ). At this time, rotation of the central rotating shaft  11  is transmitted to the output shaft  19  via the first rotating shaft  13  and the second rotating shaft  17 , and then the curtain of the fireproof rolling door is wound on the winding shaft by the output wheel  191 , which is secured on the output shaft  19 , so as to open the door, or dewound to close the door. When the electric motor mechanism  20  is switched off to stop rotating, the control circuit electrically switched off the first electromagnet  301  simultaneously. In this case, the first electromagnet  301  is magnetically deexcited, hence the biasing force of the elastic element  203  exerts the hollow shaft  15  on the central rotating shaft  11  to couple each other (as shown in  FIG. 2   a ). At this time, as the fireproof rolling door being open, a torque generated by the weight of the curtain of the fireproof rolling door always acts on the output wheel  191  and is transmitted to the hollow shaft  15  via the output shaft  19 , the second rotating shaft  17 , the first rotating shaft  13 , and the central rotating shaft  11 , hence the inner hub  53   a , which is engaged with the left side of the hollow shaft  15 , has a rotation tendency. Since the two protrudent portions  511 ,  511 ′ of the torsional spring  51  are located between the two bolt pieces  535  and  535 ′, rotation of the inner hub  53   a  makes the bolt piece  535  ( 535 ′) abut the twisting direction side “a” of the protrudent portions  511  ( 511 ′) of the torsional spring  51  (as shown in  FIG. 4   a ). The larger the tendency in the torsion direction is, the larger the force for constricting the torsional spring  51  on the outer hub  53   b  is, so that the hollow shaft  15  is in a brake state. 
     Furthermore, the control circuit becomes invalid immediately once in a power failure. That is, the second electromagnet  601  is not magnetically excited, the second electromagnetic clutch mechanism  60  releases the coupling of the first rotating shaft  13  with the second rotating shaft  17  (as shown in  FIG. 2   b ). At this time, the curtain of the fireproof rolling door falls down by its own weight, so that fire or smoke is blocked from outside immediately. Furthermore, when emergency escape is needed after a fire alarm occurs, the fireproof rolling door can be opened again by rotating the pull-chain disc  41 ′ via the manual pull-chain  42 . In detail, in this manual operation, the electric energy storage device is controlled to electrically power the second electromagnetic clutch mechanism  60 , so as to keep a coupling between the first rotating shaft  13  and the second rotating shaft  17 . At this time, when the pull-chain disc  41 ′ is rotated by the pull-chain  42 , the protrudent pin  412  is rotated synchronously with the pull-chain disc. Since there is a predetermined gap between the extending end portion  412   a  of the protrudent pin  412  and a bottom end of the circular slot  5311  on the end disc  531  of the inner shaft hub  53   a , after a force is exerted through the pull-chain  42  to rotate the pull-chain disc  41 ′, the protrudent pin  412  fixed on the partition plate  411  at last will turn and actuate the protrudent portion  511  ( 511 ′) of the torsional spring  51  in the detwisting direction side “b” to a effect that the inner diameter of the torsional spring  51  is enlarged and releases its brake on the outer shaft hub  53   b . That is to say, the extending end portion  412   a  of the protrudent pin  412  turns and touches one of the bottom ends of the circular slot  5311  accordingly to exert and rotate the end disc  531  of the inner hub  53   a , and to make the inner shaft hub  53   a  and the hollow shaft  15  rotate together. Hence, a rotation of the pull-chain disc  41 ′ is transmitted to the output shaft  19  via the hollow shaft  15 , the central rotating shaft  11 , the first rotating shaft  13 , the second rotating shaft  17 . The curtain of the fireproof rolling door are wound on the winding shaft by the output wheel  191  fixed on the output shaft  19  (as shown in  FIGS. 3  and  4   a ). Additionally, it is understood from the above description that in the case that the electric motor mechanism  20  is detached during maintenance or in the case that the electric motor mechanism  20  is out of work, the curtain of the fireproof rolling door can be opened/closed in a manual mode through the combination pull-chain disc and brake  40 . 
     The above description is just for the preferred embodiment of the machine mechanism  1  of the electric rolling door operator for the fireproof rolling door according to the present invention. It can be understood to those skilled in the art that other derivative embodiments can be obtained based on the machine mechanisms of the present invention. For example, as shown in  FIG. 5 , in the case of omitting the electric motor mechanism  20  and the first electromagnetic clutch mechanism  30 , it becomes a manual door operator for a fireproof rolling door, wherein the machine mechanisms  1 ′ comprises the housing  10  for defining an accommodating space, in which the combination pull-chain disc and brake  40 , the second electromagnetic clutch mechanism  50 , and the centrifugal braking mechanism  70 , the speed reduction mechanism  80 , etc. are accommodated in sequence. Furthermore, as shown in  FIG. 6 , in the case of omitting the second electromagnetic clutch mechanism  60  and the centrifugal brake mechanism  70 , it becomes a non-fireproof type of general standard electric door operator, wherein the machine mechanisms  1 ′ comprises the housing  10  for defining an accommodating space, in which the electric motor mechanism  20 , the first electromagnetic clutch mechanism  30 , the combination pull-chain disc and brake  40 , the speed reduction mechanism  80 , etc. are accommodated in sequence. Moreover, as shown in  FIG. 7 , in the case of omitting the electric motor mechanism  20 , the first electromagnetic clutch mechanism  30 , the second electromagnetic clutch mechanism  60 , and the centrifugal braking mechanism  70 , it becomes a non-fireproof type of general standard manual door operator, wherein the machine mechanisms  1 ′ comprises the housing  10  for defining an accommodating space, in which the combination pull-chain disc and brake  40 , the speed reduction mechanism  80 , etc. are accommodated in sequence. In the case of no extra cost to be increased, more types of door operators with various control ways are able to be constructed by changing and exchanging the common components. Accordingly, not only is development cost low, production is simplified, parts are standardized and assembled easily, but also stock cost is relatively reduced. Therefore, the present invention is not limited to the disclosed embodiments. That is, equivalent changes and modifications without departing from the claims of the present invention should fall within the scope of the present invention.