JP5350145B2 - Shutter curtain rapid abnormal drop prevention device for shutter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rapidly prevent a shutter curtain from falling by self-weight, for example, when an endless traveling member is cut. <P>SOLUTION: The relational expression is established when k represents a spring constant of a torsion coil spring 76; m represents the weight of the shutter curtain which is unwound from a winding shaft; g represents gravity acceleration; I represents the moment of inertia of winding; I<SB>d</SB>represents the moment of inertia of a ratchet member; R represents the winding radius of the shutter curtain; R<SB>g</SB>represents a center-of-gravity winding diameter; Z represents the number of teeth of a sprocket wheel as a driven rotary member; &theta;<SB>h</SB>represents an angle of the ratchet member when a chain as the endless traveling member functions; and &theta;<SB>b</SB>represents an angle of the ratchet member when the chain has no functions, that is, when it is cut. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention prevents the shutter curtain from suddenly falling down uncontrollably when the endless running member that rotates the winding shaft for opening and closing the shutter curtain of the shutter device becomes nonfunctional due to cutting or the like. For example, an opening shutter device for opening and closing openings such as doorways and windows with a shutter curtain, and a disaster prevention shutter device for forming a disaster prevention zone with a shutter curtain, etc. It can be used for a shutter device.

  An opening shutter device for opening and closing an opening such as an entrance / exit with a shutter curtain winds up a shutter curtain whose opening / closing movement direction is vertical, and rotates a winding shaft and a winding shaft. An opening / closing machine serving as a driving device for driving, a driven sprocket wheel attached to a winding shaft as a driven rotating member, a driving sprocket wheel attached to the opening / closing machine as a driving rotating member, and driven And a chain that is looped around the sprocket wheel and the drive sprocket wheel and serves as an endless traveling member. The drive force of the switch is transmitted to the take-up shaft through the drive sprocket wheel, chain, and driven sprocket wheel, so that the take-up shaft takes up and rotates the shutter curtain. Open and close in the vertical direction.

  In the shutter device having such a structure, it is normal that the presence of the chain prevents the winding shaft from freely rotating due to the weight of the shutter curtain. When it is cut due to deterioration, fatigue failure, etc., or when the chain is detached from the driving sprocket wheel or driven sprocket wheel, the winding shaft on which the shutter curtain's own weight acts freely rotates, In other words, if the chain becomes non-functional, the shutter curtain will fall rapidly and uncontrollably due to free rotation of the winding shaft, and means for avoiding this rapid drop is described in Patent Document 1 below. Is shown in

  The shutter device shown in Patent Document 1 is provided with a ratchet gear which is an integral rotating member integrated with a winding shaft and a driven sprocket wheel, and is provided on the outer periphery of the ratchet gear. A ratchet member having a claw portion which is an engagement portion engageable with a plurality of teeth formed in a circumferential direction, and capable of rotating about a central axis, and the claw portion is always directed to the driven sprocket wheel side A spring that is a biasing means that is biased, and a rotary idler that is in contact with the chain by meshing with the chain by the biasing force of the spring when the chain functions. A stopper is provided.

  When the chain idler is removed from the chain, when the chain is cut off, the ratchet member of the stopper, which serves as a rotation stopping means for stopping the rotation of the winding shaft, moves to the side that engages the teeth of the ratchet gear. By rotating with the urging force of the spring, the engaging portion of the ratchet member is engaged with the teeth of the ratchet gear, and thus, the shutter curtain can be controlled in an abnormally rapid and abnormal drop due to the free rotation of the winding shaft. Try to prevent.

Japanese Utility Model Publication No. 2-105494

  According to the above prior art, the pawl portion of the ratchet member of the stopper serving as the rotation stop means is engaged with the teeth of the ratchet gear which is an integral rotating member integrated with the winding shaft and the first sprocket wheel. By doing so, it is possible to prevent the shutter shaft from freely rotating due to the shutter curtain's own weight and causing the shutter curtain to fall rapidly and abnormally. The time required to engage the ratchet gear teeth is required to be shorter. That is, it is required to more quickly prevent the winding shaft from freely rotating due to the weight of the shutter curtain.

  An object of the present invention is to provide a shutter curtain rapid abnormal drop preventive device and a shutter curtain rapid abnormal drop preventive device that can more quickly prevent the winding shaft from freely rotating due to the dead weight of the shutter curtain when the endless running member becomes nonfunctional. Is to provide a method.

A shutter curtain rapid abnormal drop prevention device for a shutter device according to the present invention includes a driven rotating member attached to a winding shaft for winding and unwinding a shutter curtain whose vertical direction is the opening / closing movement direction, and the winding A drive rotating member attached to a driving device for rotating the shaft, and the driven rotating member and the driving rotating member are wound around, and the rotational driving force of the driving device is transmitted from the driving rotating member to the driven rotating member. An endless traveling member, and an engagement portion that can be engaged with a plurality of teeth formed in the circumferential direction on the outer peripheral portion of the driven rotating member or an integrated rotating member integrated with the driven rotating member. A ratchet member that is rotatable about a central axis, a spring that constantly urges the ratchet member toward the driven rotating member, and the endless traveling member when the endless running member functions. A contact portion that contacts the row member with the urging force of the spring, and when the endless traveling member is rendered nonfunctional, the engagement portion is urged by the urging force of the spring to move the driven rotating member or the integrated rotating member. A rotation stop device for stopping rotation of the winding shaft by engaging with the teeth of the shutter curtain rapid abnormal drop prevention device of the shutter device, wherein the spring constant of the spring is k, the winding shaft The weight of the shutter curtain drawn out from m, gravity acceleration g, winding inertia moment I, inertia moment of the ratchet member I _d , winding radius of the shutter curtain R, center of gravity winding radius R _g , The number of teeth of the driven rotating member is Z, the angle of the ratchet member when the endless running member functions is θ _h , and the ratchet member when the endless running member is disabled When the angle of θ _b is

の関係が成立する構成となっていることを特徴とするものである。

It is characterized in that the relationship is established.

The inertia moment about the rotation center axis of the ratchet member is I _d [kg · m ² ], the rotation angle of the ratchet member is θ [rad], the time is t [sec], and the spring constant of the spring is k [N · m / rad], the equation of motion for the ratchet member and spring system is

となり、この式（１）の一般解は、

The general solution of equation (1) is

となる。ここで、初期条件ｔ＝０、θ（０）＝θ_ｈ（前記無端走行部材の機能時における前記ラチェット部材の角度）及びｔ＝０、ｄθ／ｄｔ＝０より、Ｃ_１＝０、Ｃ_２＝θ_ｈであるから、上記の式（２）は、

It becomes. Here, from the initial conditions t = 0, θ (0) = θ _h (angle of the ratchet member when the endless running member functions) and t = 0, dθ / dt = 0, C ₁ = 0, C ₂ = Θ _h , the above equation (2) is

となる。また、無端走行部材が切断等により無機能化したときから、回転止め装置のラチェット部材の係合部が被動回転部材又は一体化回転部材の歯に係合するまでの時間はｔ_ｄ（ｓｅｃ）は、上記の式（３）において、θ（ｔ）＝θ_ｂとして変形すると求められ、

It becomes. Further, the time from when the endless traveling member becomes nonfunctional due to cutting or the like until the engaging portion of the ratchet member of the rotation stopping device engages with the tooth of the driven rotating member or the integrated rotating member is t _d (sec) Is obtained by transforming as θ (t) = θ _b in the above equation (3),

となる。

It becomes.

On the other hand, the moment of inertia of the winding is I [kg · m ² ], the weight of the shutter curtain fed out from the winding shaft is m [kg], the acceleration of gravity is g [m / s ² ], and the winding radius of the shutter curtain is When R [m], the center of gravity winding diameter is R _g “m”, and the number of teeth of the driven rotating member or the integrated rotating member is Z [pieces], the driven rotating member or the integrated rotating member at time t [sec] The rotation angle θ (t) is

となる。

It becomes.

Further, when the inter-tooth angle of the driven rotating member or the integrated rotating member (the angle between the teeth formed in the circumferential direction on the outer peripheral portion of the driven rotating member or the integrated rotating member) is θ _m [rad]. , because it is θ _m = 2π / Z, the time _{t m} required for the driven rotary member or integrated rotating member rotates theta _m is the above equation (5), θ (t) = 2π / Z, When transforming as t = t _m ,

となる。

It becomes.

Therefore, while the driven rotating member or the integrated rotating member rotates between the inter-tooth angles θ _m , in other words, while the driven rotating member or the integrated rotating member rotates by one tooth, the ratchet member is driven by the driven rotating member or the integrated rotating member. In order to enter between the teeth of the rotating member, a relationship of t _d <t _m may be established. That is, according to the above-described formula (4) and formula (6),

の関係が成立すればよい。この式（７）を以下に示すように変形していくと、

It is sufficient if the relationship is established. When this equation (7) is transformed as shown below,

となる。したがって、被動回転部材又は一体化回転部材が歯間角度θ_ｍ回転する間に、ラチェット部材の係合部が被動回転部材又は一体化回転部材の歯間に入り込むためには、上記の式（１２）の関係が成立する構成となっていればよい。

It becomes. Therefore, in order for the engaging portion of the ratchet member to enter between the teeth of the driven rotating member or the integrated rotating member while the driven rotating member or the integrated rotating member rotates between the interdental angles θ _m , the above formula (12 As long as the relationship is established.

That is, when the shutter curtain rapid abnormal drop prevention device is configured so that the relationship of the above expression (12) is established, the engagement of the ratchet member is performed while the driven rotation member or the integrated rotation member rotates the inter-tooth angle θ _m. The joint portion can be inserted between the teeth of the driven rotating member or the integrated rotating member. As a result, while the endless traveling member is free functions, the take-up shaft is rotated interdental angle theta _m, it is possible to prevent the free rotation of the winding shaft.

  For this reason, according to this invention, it can prevent more rapidly that a winding shaft rotates freely with the dead weight of a shutter curtain at the time of non-functioning of an endless traveling member.

  In the present invention, the rotation direction of the winding shaft when the shutter curtain is extended and the rotation direction of the ratchet member may be opposite to each other, or may be the same direction.

  However, in the latter case, compared to the former case, the engagement portion of the ratchet member is likely to be bounced without entering the teeth of the driven rotating member or the integrated rotating member that rotates together with the winding shaft. . On the other hand, according to the former case, after the engaging portion of the ratchet member enters the tooth of the driven rotating member or the integrated rotating member that rotates together with the winding shaft, the engaging portion enters the tooth more deeply (tooth Will engage the bottom).

  Therefore, it is more preferable that the rotation direction of the winding shaft when the shutter curtain is extended and the rotation direction of the ratchet member are opposite to each other.

  In this invention, the detection means for detecting the non-functioning of the endless traveling member may be provided or may not be provided.

  According to the former case, it can be grasped on the device side that monitors the operation of the shutter device that the endless traveling member has become non-functional. Thereby, the administrator of the shutter device can grasp that the endless traveling member has become nonfunctional.

  In the present invention, the form, structure, etc. of the detecting means for detecting the non-functionality of the endless traveling member are arbitrary, and an example thereof is a switch that is operated by the rotation of the ratchet member when the endless traveling member is nonfunctional. Means.

  This switch means may be a contact type that operates by contacting with a rotating ratchet member, or a non-contact type that operates when light, ultrasonic waves, etc. are blocked by the rotating ratchet member. Good. The switch means may be operated by another member (for example, an operation member) attached to the ratchet member.

  In addition, when the detection means for detecting the non-functionality of the endless traveling member is provided, when the endless traveling member is deactivated by the detection means, it is detected that the endless traveling member has become nonfunctional. You may make it provide the alerting | reporting means for alerting | reporting outside. Here, the form of notification by the notification means is arbitrary, and may be, for example, a sound such as a siren, a buzzer, or a voice, or a light such as red or yellow light.

  In addition, it is preferable that the resistance force of the switch means operated by the rotation of the ratchet member when the endless traveling member is rendered nonfunctional is extremely smaller than the spring torque of the spring. In other words, it is preferable that the resistance force of the switch means that is actuated by the rotation of the ratchet member when the endless traveling member is rendered nonfunctional is so small that it can be ignored compared to the spring torque of the spring.

  In the above description, the functionless endless traveling member means that the winding shaft is in a state of free rotation due to the weight of the shutter curtain. One example of this defunctionalization is that the endless traveling member is cut, and another example is that the endless traveling member is disengaged from the drive rotating member and the driven rotating member described above, and another example is When the rotation of the driving rotating member is transmitted to the driven rotating member and the stop of the driving rotating member is transmitted to the driven rotating member due to the frictional force generated between the endless traveling member, the driving rotating member, and the driven rotating member. In other words, the magnitude of the frictional force becomes smaller than the original magnitude or disappears.

  In the present invention described above, the types of the driven rotating member, the driving rotating member, and the endless traveling member are arbitrary, and the first example is that the driven rotating member, the driving rotating member, and the endless traveling member are connected to the driven sprocket wheel. The second example is to use a driven timing pulley, a driving timing pulley, and a timing belt as the driven rotating member, the driving rotating member, and the endless traveling member. Furthermore, the third example is that the driven rotating member, the driving rotating member, and the endless traveling member are a driven flat pulley, a driving flat pulley, and a flat belt. In this third example, teeth are formed in the circumferential direction on the outer peripheral portion of the integrated rotating member integrated with the driven rotating member, and the engaging portion of the ratchet member is engaged with this tooth.

  In the present invention described above, the spring may be arbitrary, and an example thereof is a torsion coil spring.

  In the present invention, the contact portion that contacts the endless running member may be of any structure and shape, and an example thereof is a slide type that slides while the endless running member is in contact. When the endless traveling member is a chain or a timing belt, the contact portion may be a rotary type such as a gear that meshes with the endless traveling member and rotates by traveling of the endless traveling member.

  Further, the device according to the present invention can be applied to a shutter device in which the shutter curtain is composed of an arbitrary curtain constituent member. That is, in the present invention, the entire or main part of the shutter curtain may be formed of the same type of curtain constituent member, for example, a slat, or the entire or main part of the shutter curtain is a sheet, panel, net, link. It may be formed by a rod-like member such as a plurality of pipes that are connected together, or the whole or the main part of the shutter curtain is connected by these slats, sheets, panels, nets, and links. You may form with the combination of a some curtain structural member among rod-shaped members, such as a some pipe.

  Further, a return spring is arranged on the winding shaft so that the return spring force is accumulated by the downward movement of the shutter curtain, and the upward movement of the shutter curtain is caused by the return spring force accumulated in the return spring. It may be used as an auxiliary force.

  In the present invention, the rotation of the driven rotating member or the integrated rotating member is stopped while the driven rotating member or the integrated rotating member rotates by an inter-tooth angle (in other words, while rotating by one tooth). If there is no problem with the speed to prevent the take-up shaft from rotating freely, the driven rotating member or the integrated rotating member will rotate by two or more interdental angles. Further, the rotation of the driven rotating member or the integrated rotating member may be stopped.

  The shutter curtain rapid abnormal drop prevention method of the shutter device according to the present invention includes a driven rotating member attached to a winding shaft for winding and unwinding the shutter curtain whose vertical direction is the opening / closing movement direction, and the winding A drive rotating member attached to a driving device for rotating the shaft, and the driven rotating member and the driving rotating member are wound around, and the rotational driving force of the driving device is transmitted from the driving rotating member to the driven rotating member. An endless running member and a shutter curtain rapid abnormal drop prevention method for a shutter device provided with a plurality of teeth formed in a circumferential direction on an outer peripheral portion after the endless running member has become nonfunctional By stopping the rotation of the driven rotating member or the integrated rotating member while the driven rotating member or the integrated rotating member rotates between teeth. It is characterized in that stopping the rotation of the winding shaft.

  In the present invention, after the endless traveling member is rendered nonfunctional, the driven rotating member or the integrated rotating member having a plurality of teeth formed in the circumferential direction on the outer peripheral portion is rotated during the inter-tooth angle rotation. Since there is one that stops the rotation of the winding shaft by stopping the rotation of the integrated rotating member, it is possible to more quickly prevent the winding shaft from freely rotating due to the weight of the shutter curtain when the endless traveling member becomes nonfunctional.

  In the present invention, after the endless traveling member is rendered non-functional, the driven rotating member or the integrated rotating member having a plurality of teeth formed in the circumferential direction on the outer peripheral portion is rotated during the inter-tooth angle rotation. As a first example of the means for stopping the rotation of the integrated rotating member, as described above, the driven rotating member or the engaging rotating member that can be engaged with the teeth of the integrated rotating member has an endless traveling member. When the function becomes non-functional, there may be mentioned one provided with a ratchet member that is rotationally biased by the spring force of a spring having a spring constant k that satisfies the relational expression (12). In this first example, when the endless traveling member becomes nonfunctional, the ratchet member is rotated and biased by the spring force of a spring having a spring constant k that satisfies the relational expression (12). When the engaging portion engages with the teeth, the rotation of the driven rotating member or the integrated rotating member is stopped.

  Further, as a second example of the means for stopping the rotation of the driven rotating member or the integrated rotating member, the detecting means for detecting the non-functioning of the endless traveling member, and the absence of the endless traveling member by this detecting means. When functionalization is detected, a rod-like member inserted between the teeth of the driven rotating member or the integrated rotating member by the biasing force by the biasing means while the driven rotating member or the integrated rotating member rotates between the teeth Can be mentioned. In this second example, the rod-shaped member is disposed on the stationary member that is stationary relative to the driven rotating member or the integrated rotating member, and is movable in the direction of the rotational axis of the driven rotating member or the integrated rotating member, When the endless traveling member is functioning, the rod-shaped member is disposed away from the driven rotating member and the integrated rotating member. When the endless traveling member becomes nonfunctional, the rod-like member is moved by the biasing force of the biasing means while the driven rotating member or the integrated rotating member rotates at the inter-tooth angle. Inserted between them, the rotation of the driven rotating member or the integrated rotating member is stopped.

  In this second example, the moving speed of the rod-shaped member inserted between the teeth of the driven rotating member or the integrated rotating member by the biasing force of the biasing means (the rod-shaped member is on standby when the endless traveling member is functioning). The movement speed (protrusion speed) of this rod-shaped member from the position where the endless running member is rendered nonfunctional and inserted between the teeth of the driven rotating member or the integrated rotating member is determined by the driven rotating member or the integrated The rod-shaped member is moved (protruded) by the urging force of the urging means so as to be faster than the rotation speed of the rotation member between the teeth.

  The detection means may be, for example, an optical sensor that optically detects that the endless traveling member has become nonfunctional, or a mechanical sensor that detects mechanically. Further, the urging means may be, for example, a spring or a fluid pressure such as a hydraulic pressure.

  Further, the shutter curtain rapid abnormal drop prevention device and the shutter curtain rapid abnormal drop prevention method of the shutter device according to the present invention can be applied to a shutter device for various uses. Includes a management shutter device for opening and closing openings such as entrances and exits, a disaster prevention shutter device for forming a disaster prevention zone with a fully closed shutter curtain, and a combined management and disaster prevention shutter device . Further, the shutter device for disaster prevention includes a shutter device for lifting means for forming a disaster prevention section in the vicinity of the lifting means such as an elevator or a staircase.

  According to the present invention, it is possible to more quickly prevent the winding shaft from freely rotating due to the weight of the shutter curtain when the endless traveling member is rendered nonfunctional.

FIG. 1 is a front view showing an entire shutter device according to an embodiment of the present invention. FIG. 2 is an enlarged view of a part of the two left and right brackets shown in FIG. 1 and is a partially cutaway view showing a winding shaft in section. FIG. 3 is a front view showing the periphery of the bearing member in the connecting shaft shown in FIG. 2 in section. 4 is a side view of the connecting shaft portion shown in FIGS. 2 and 3 as a cross section, and the right bracket shown in FIGS. 1 and 2 as seen from the winding shaft side. It is a figure which shows before the cutting | disconnection of the chain which is an endless traveling member. FIG. 5 is a side view of the right bracket shown in FIGS. 1 and 2 as viewed from the winding shaft side, and shows only the support plate and the column shown in FIGS. 2 and 3. FIG. FIG. 6 is a view similar to FIG. 4 showing the chain after being cut. FIG. 7 is an enlarged view of the rotation stopper before the chain is cut as shown in FIG. FIG. 8 is an enlarged view of the rotation stopper after the chain is cut as shown in FIG. 9 is a cross-sectional view taken along line S9-S9 in FIG. FIG. 10 is a simplified side view of members such as a driven sprocket wheel, a winding shaft, a shutter curtain, and a seat plate, which are driven rotating members. FIG. 11 is a front view of the rotation stopper before the chain is cut. FIG. 12 is a front view of the rotation stopper after the chain is cut. FIG. 13 is an enlarged view of a rotation stopping device according to another embodiment.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated based on drawing. The shutter device according to the present embodiment is a management shutter device. That is, in the shutter device according to the present embodiment, the shutter curtain opens and closes an opening such as an entrance / exit when an operation device described later is operated. In the present invention, a sensor for detecting a person, a vehicle, or the like is used instead of the operation device, and the shutter curtain opens and closes an opening such as an entrance / exit based on a signal from the sensor. The present invention can also be applied to a shutter device.

  FIG. 1 is a front view of the entire management shutter device according to the present embodiment. In FIG. 1, the opening / closing movement direction is a vertical direction, and a shutter curtain 1 that moves downwardly closes and moves is shown. It shows a half-closed state that is closed to about half. The opening that is opened and closed by the shutter curtain 1 is an entrance / exit 2 formed in the building, and the entrance / exit 2 includes the left and right building frames 3 and 4 such as walls and the lower end of the shutter curtain 1 when fully closed. It is surrounded by a floor 5 and a ceiling member 6 which are mating members against which the part hits. The left and right building frames 3 and 4 are attached with two left and right guide rails 7 and 8 in which both end portions in the left and right direction of the shutter curtain 1, in other words, both end portions in the width direction of the shutter curtain 1 are slidably inserted. The shutter curtain 1 is opened and closed in the vertical direction by being guided by the guide rails 7 and 8 serving as guide members.

  The left and right brackets 10 and 11 are disposed in the ceiling back space 9 partitioned by the ceiling member 6 with respect to the entrance / exit 2, and these brackets 10 and 11 are lowered in the ceiling back space 9. Since both ends of the winding shaft 13 in the axial direction of the winding shaft 13 are rotatably supported by the brackets 10, 11 while being coupled to the building housing 12 such as a wall, the brackets 10, 11 are This is a support member that rotatably supports the winding shaft 13. The upper end of the shutter curtain 1 is fastened to the winding shaft 13 with a fastening tool such as a bolt, and the shutter curtain 1 passes through the slit 15 of the lintel 14 disposed on the ceiling member 6. The shutter curtain 1 is opened and closed in the vertical direction from the ceiling back space 9 side, and the shutter curtain 1 is moved up and down by the winding shaft 13 rotating forward and backward.

  In addition, by attaching a case member having a length in the left-right direction straddling the brackets 10, 11 to the brackets 10, 11, the case shaft and the brackets 10, 11 allow the winding shaft to be placed in the ceiling space 9. You may provide the shutter box in which 13 was accommodated.

  The shutter curtain 1 has a curtain main body portion 16 that forms most of the shutter curtain 1 and a seat plate 17 attached to the lower end portion of the curtain main body portion 16. This is a slat connecting portion formed by connecting up and down a large number of slats 18 serving as curtain constituent members.

  FIG. 2 is an enlarged front view of a part of the left and right brackets 10 and 11 shown in FIG. 1 and is a partially broken front view. In FIG. ing. At the left end of the winding shaft 13, there is provided a shaft neck member 20 having a smaller diameter than the cylindrical main body portion 19 of the winding shaft 13 and disposed at the center of the main body portion 19. The shaft neck member 20 is coupled to the main body 19 via plate-like core members 21 and 22 attached to the inside of the main body 19 by welding or the like. The left end 20A of the shaft neck member 20 protrudes from the main body 19, and this protruding portion 20A is a sliding bearing or ball bearing disposed on the left bracket 10 out of the two left and right brackets 10, 11. It is supported by the bracket 10 by a bearing member 23 such as a rotatable member. For this reason, the shaft neck member 20 is a central axis of the winding shaft 13 on the bracket 10 side.

  A connecting shaft 30 is disposed coaxially with the take-up shaft 13 on the inner surface of the right bracket 11 facing the take-up shaft 13 of the left and right brackets 10, 11. As shown in FIG. 3, a plurality of, in the present embodiment, two in the axial direction of the connecting shaft 30 are attached to the bracket 11 via bearing members 31, 32 such as sliding bearings or ball bearings. It is arranged so that it can rotate freely. FIG. 3 is a front view showing the periphery of the bearing members 31 and 32 in the connecting shaft 30 of FIG. 2 as a cross section. The bearing member 31 is a bent product of a sheet metal, and includes a support plate 33 attached to the bracket 11 by welding or the like, and a plate-like pressing member 34 fastened to the support plate 33 with a fastening tool such as a screw. It is supported by. The bearing member 32 is supported by a support portion 35 formed on the bracket 11 made of sheet metal and a plate-like pressing member 36 attached to the bracket 11 by welding or the like. The coupling shaft 30 is rotatably supported by the bracket 11 by these bearing members 31 and 32.

  Further, the end 30 </ b> A on the winding shaft 13 side of the connecting shaft 30 is inserted into the main body 19 of the winding shaft 13. A boss member 37 is coupled to the outer periphery of the end portion 30A. As shown in FIG. 4, the outer periphery of the boss member 37 has concave portions 37A and convex portions 37B alternately in the circumferential direction. Is formed. FIG. 4 is a side view of the bracket 11 taken from the winding shaft 13 side, with the connecting shaft 30 being a cross section. As shown in FIGS. 2 and 3, a plate-shaped core member 38 is attached to the inside of the main body portion 19 of the winding shaft 13 by welding or the like. Are formed with a convex portion and a concave portion that engage with the concave portion 37A and the convex portion 37B of the boss member 37, and the winding shaft 13 and the connecting shaft 30 are circumferentially engaged by the engagement of the concave portion and the convex portion. It is connected to.

  With the above structure, the end of the winding shaft 13 on the bracket 11 side is supported by the bracket 11 and the support plate 33 via the connection shaft 30 and the bearing members 31 and 32 and is connected to the winding shaft 13. The shaft 30 rotates integrally with each other, and the connecting shaft 30 is a central axis on the side of the bracket 11 in the winding shaft 13.

  As shown in FIGS. 2 and 3, an opening / closing device 40 serving as a driving device for rotating the winding shaft 13 is disposed on the inner surface of the bracket 11 facing the winding shaft 13. . The arrangement of the opening / closing machine 40 on the bracket 11 is such that a plurality of support members 41 to 44 coupled to the bracket 11 and four in this embodiment, as shown in FIG. This is done by combining 40A (see FIGS. 2 and 3).

  More specifically, the flange portion 40A of the opening / closing machine 40 is formed at the end of the main body portion 40B of the opening / closing machine 40 on the bracket 11 side, and the support members 41 to 44 are respectively The column 11 has a length that extends from the bracket 11 toward the take-up shaft 13, and one of the column members 41 to 44 has a column member 41 as shown in FIG. A rod-like portion 41A that further extends from the top of 41 to the winding shaft 13 side is provided. After this rod-like portion 41A is inserted into the hole 45 formed in the flange portion 40A, a fastening tool 47 such as a screw inserted into the hole 46 of the flange portion 40A from the side opposite to the bracket 11 side is attached to another column. Screw into the respective screw holes 48 formed in the members 42 to 44. Thereby, the opening / closing machine 40 is attached to the bracket 11 by the support members 41 to 44 and the fastening tool 47.

  The attaching operation of the opening / closing machine 40 to the bracket 11 is performed by inserting the rod-like portion 41A of the column member 41 into the hole 45 of the flange portion 40A and then inserting the rod portion 41A into the hole 46 of the flange portion 40A from the side opposite to the bracket 11 side. Since the fasteners 47 are screwed into the respective screw holes 48 of the support members 42 to 44, the screwing operation of the support members 47 to 44 into the screw holes 48 of these support members 47 is performed by the opening / closing device 40. The entire weight can be supported while being supported by the rod-shaped portion 41A of the column member 41. Therefore, the mounting operation of the opening / closing device 40 to the bracket 11 can be performed by one worker.

  The opening / closing machine 40 is composed of a combination of an electric motor and a brake. That is, the drive device for rotating the winding shaft 13 in the present embodiment is a brake-equipped drive device. The rotating shaft of the electric motor is a driving shaft 49 of the opening / closing device 40, and this driving shaft 49 cannot rotate when the brake is turned on. The brake is turned on by electrical means operated by operating means or mechanical means operated manually.

  The drive shaft 49 of the opening / closing machine 40 is attached with a small-diameter drive sprocket wheel 50 which is a drive rotating member in the present embodiment, and the connecting shaft 30 described above is shown in FIG. As described above, a large-diameter driven sprocket wheel 52 which is a driven rotating member in the present embodiment is attached via a thick plate-like base member 51 coupled to the connecting shaft 30, and a drive sprocket wheel 50 is attached. A chain 53 that is an endless traveling member in the present embodiment is wound around the driven sprocket wheel 52. For this reason, the take-up shaft 13 and the opening / closing machine 40 are motively connected via the transmission means including the sprocket wheels 50 and 52 and the chain 53 and the connecting shaft 30, and The reverse rotation is transmitted to the winding shaft 13.

  Further, the driven sprocket wheel 52 is attached to the take-up shaft 13 via the connecting shaft 30, and the driven sprocket wheel 52 and the take-up shaft 13 rotate together. The bracket 11 and the support plate 33 are supported via the connecting shaft 30 and the bearing members 31 and 32.

  Of the left and right building housings 3 and 4 shown in FIG. 1, in one of the building housings 4, the shutter curtain 1 is opened and moved upward with respect to the entrance / exit 2, closed and moved downward, and stopped. An operating device 60 is attached to perform the above. The operation device 60 is provided with an “open” button, a “close” button, and a “stop” button.

  When the shutter plate 1 reaches the height position of the lintels 14 disposed on the ceiling member 6 as described above, or when the seat plate 17 has the lintels 14 and the floor 5 as shown in FIG. When the “close” button is operated when the shutter curtain 1 has reached a halfway position (half-open state), the control device (not shown) receives a signal from the “close” button. As the brake 40 is turned off, the drive shaft 49 of the electric motor rotates forward. As a result, the shutter curtain 1 is fed downward from the take-up shaft 13 due to the forward rotation of the drive shaft 49 and the normal rotation of the take-up shaft 13 due to the weight of the shutter curtain 1, and the shutter curtain 1 that is closed and moved thereby is When the plate 17 reaches the fully closed position where the floor 17 is landed, the brake is turned on by the control device that receives a signal from a sensor (not shown) that detects the fully closed position, and the drive shaft 49 is rotated forward. Stop. Further, when the shutter curtain 1 is fully closed or when the seat plate 17 reaches the midway position between the lintels 14 and the floor 5 as shown in FIG. When the “open” button is operated in the semi-closed state), the brake is turned off by the control device that receives a signal from the “open” button, and the drive shaft 49 rotates in the reverse direction. Due to the reverse rotation of the shaft 13, the shutter curtain 1 is wound around the winding shaft 13 and moves open. When the shutter curtain 1 reaches the fully open position, the brake is turned on and the reverse rotation of the drive shaft 49 is stopped by the control device that receives a signal from a sensor (not shown) that detects the fully open position.

  In addition, when the “stop” button is operated while the shutter curtain 1 is being closed and moved, the control device that receives a signal from the “stop” button turns on the brake and causes the drive shaft 49 to rotate forward. In order to stop, the shutter curtain 1 stops at that position. Further, when the “stop” button is operated while the shutter curtain 1 is being opened and moved, the brake is turned on by the control device that receives a signal from the “stop” button, and the drive shaft 49 is reversely rotated. In order to stop, the shutter curtain 1 stops at that position.

  Of the two left and right brackets 10 and 11 that support the take-up shaft 13, the bracket 11 rotates the driven sprocket wheel 52 when the chain 53 is cut as shown in FIG. An anti-rotation device 70 is provided for stopping the rotation. The arrangement position of the device 70 is an inner surface facing the winding shaft 13 in the bracket 11. 2 and 3, the device 70 is omitted, and FIG. 4 is shown with the aforementioned opening / closing device 40 omitted. 4 shows the state before the chain 53 is cut, while FIG. 6 shows the state after the chain 53 is cut. FIG. 7 shows an enlarged view of the rotation stopper 70 before the chain 53 is cut, and FIG. 8 shows an enlarged view of the rotation stopper 70 after the chain 53 is cut. In FIG. 8, the cut state of the chain 53 is shown in a simplified manner.

  Note that the cutting that is the non-functioning of the chain 53 occurs, for example, when the shutter curtain 1 is fully opened or when the shutter curtain 1 that is fully closed is opened and moved.

  The function of the chain 53 is not limited to the case where the chain 53 is cut as described above. For example, the chain 53 may be detached from the driven sprocket wheel 52. Unless otherwise specified, the following description will be made assuming that the chain 53 is cut.

  As shown in FIG. 4, the anti-rotation device 70 includes a ratchet device 71 disposed on the bracket 11 outside the driven sprocket wheel 52, a switch 72, and a guard member 73. It has become. More specifically, the device 70 includes a ratchet device 71 that is disposed inside an endless chain 53 that is wound around the drive sprocket wheel 50 and the driven sprocket wheel 52 described above, and a device that is disposed outside the chain 53. And a switch 72 having an actuator 72A and a guard member 73 which is disposed outside the chain 53 and prevents the chain 53 from jumping outside when the chain 53 is cut.

  As shown in FIG. 7, the ratchet device 71 is a ratchet member 75 that is rotatable about a central shaft 74 and constantly urges the ratchet member 75 to rotate toward the driven sprocket wheel 52. To the torsion coil spring 76, the ratchet member 75, the base end portion is coupled to the ratchet member 75 with a fastening member such as a screw, the operation member 77 passing through the chain 53 and the distal end portion reaching the outside of the chain 53, and the ratchet member 75 A base end portion is rotatably attached by a fastening member 78 such as a screw, and has a contact member 79 that is a contact portion that contacts the chain 53 by a biasing force of a torsion coil spring 76 when the chain 53 functions.

  The ratchet member 75 is detachably attached to the bracket 11 with a plurality of screws and the like, and can be attached to and detached from the base member 86 and the bracket 11 with a plurality of screws and the like. It is arrange | positioned in the space between the cover members 84 fastened to (fastened together).

  The ratchet member 75 has a cylindrical body 75A and a claw portion (protrusion portion) 75B that protrudes toward the driven sprocket wheel 52 at a location facing the driven sprocket wheel 52. This claw 75B engages with the teeth 52A of the driven sprocket wheel 52 when the chain 53 is cut, thereby stopping free rotation of the take-up shaft 13 and preventing the shutter curtain 1 from dropping rapidly and abnormally. It is an engaging part in the form. This claw portion 75B is preferably formed with a thickness dimension larger than that of the tooth 52A of the driven sprocket wheel 52, and the engagement of the claw portion 75B with the tooth 52A is the center of the thickness of the tooth 52A and the claw portion. It is preferable to set so that the thickness central portion of 75B is coincident or substantially coincident.

  The central shaft 74 is supported by the bracket 11 because a hole into which one end of the central shaft 74 is inserted is formed in the bracket 11. Further, the central shaft 74 is inserted through the body 75 </ b> A of the ratchet member 75.

  As shown in FIG. 7, the cover member 84, which is a bent product of sheet metal, extends obliquely downward from a horizontal portion 84A that covers most of the ratchet member 75 and from the upper and lower ends of the horizontal portion 84A. It has a substantially hat shape including an inclined portion 84B and a horizontal extending portion 84C (in other words, a flange portion 84C) that extends horizontally from the tip of each inclined portion 84B. The horizontal extending portion 84C The member 86 and the bracket 11 are fastened (jointly fastened) with a plurality of fasteners such as screws. The ratchet member 75 is accommodated in a space formed by the horizontal portion 84A of the cover member 84 and the upper and lower two inclined portions 84B.

  One end portion 76 </ b> A of the torsion coil spring 76 is locked to the lower inclined portion 84 </ b> B of the upper and lower inclined portions 84 </ b> B of the cover member 84, and the other end portion 76 </ b> B is locked to the ratchet member 75. The coil portion 76 </ b> C is wound around the trunk portion 75 </ b> A of the ratchet member 75.

  As shown in FIG. 7 and FIG. 9 which is a sectional view taken along line S9-S9 in FIG. 7, the contact member 79 serving as the contact portion in the present embodiment is an opening opened to the driven sprocket wheel 52 side. It has a cross-sectional channel shape having a portion 79A and is covered with the chain 53 from the winding shaft 13 side. Further, the contact member 79 is provided with a friction reducing member 80 formed of a hard synthetic resin or the like at a portion facing the outer side surface of the chain 53.

  The contact member 79 is attached to the ratchet member 75 whose claw portion 75B is always urged to rotate toward the driven sprocket wheel 52 around the central shaft 74 by the torsion coil spring 76. As shown in FIGS. 4 and 7, the contact member 79 in the function of the chain 53 is in contact with the outer side surface of the chain 53 in the friction reducing member 80 by the spring force of the torsion coil spring 76. By this contact, a rotation limit about the central axis 74 of the ratchet member 75 by the torsion coil spring 76 is defined. At this time, the claw portion 75B of the ratchet member 75 is separated from the teeth 52A of the driven sprocket wheel 52.

  Since the contact member 79 at this time is in contact with the outer side surface of the chain 53 in the friction reducing member 80, the rotation of the drive shaft 49 of the opening / closing device 40 for rotating the winding shaft 13 causes endlessness. When the chain 53 which is a traveling member travels, the smooth travel of the chain 53 can be ensured by the friction reducing action of the friction reducing member 80.

  Further, when the wear amount of the friction reducing member 80 reaches a predetermined value and the friction reducing member 80 is replaced, the contact member 79 is put on the chain 53 from the winding shaft 13 side. Therefore, by removing the fastener 78 that rotatably attaches the contact member 79 to the ratchet member 75, the operation of attaching a new friction reducing member 80 to the contact member 79 can be easily performed. The operation of attaching the member 79 to the ratchet member 75 again by the fastening tool 78 can be easily performed.

  The switch 72 and the guard member 73 described above are also detachably attached to the bracket 11 with a fastening tool such as a screw.

  FIG. 5 is a side view of the right bracket 11 shown in FIGS. 1 and 2 as viewed from the take-up shaft 13 side, omitting the driven sprocket wheel 52 and the like shown in FIG. It is a figure which shows only the support plate 33 and the support | pillar members 41-44 which are shown by FIG.2 and FIG.3. Further, in FIG. 5, the above-described pressing member 34 shown in FIG. 3 is also omitted. As described above, the support plates 33 which are support members for supporting the driven sprocket wheel 52 together with the bracket 11 are provided at both upper and lower ends as shown in FIG. The base portion 33A that is coupled, the upright portion 33B that rises from the base portion 33A toward the take-up shaft 13, and the main body portion that is installed between the upright portion 33B and is parallel to the bracket 11 It has a hat shape from 33C. Therefore, there is a space S between the main body 33C and the bracket 11, and the driven sprocket wheel 52 is attached to the above-described connecting shaft 30 and disposed in this space S.

  As can be seen from FIG. 4, the ratchet device 71 is disposed on the bracket 11 at a position deviating from the position where the support plate 33 is disposed.

  As shown in FIG. 5, a hole 85 for inserting the connecting shaft 30 is formed in the main body portion 33 </ b> C of the support plate 33. Further, as shown in FIG. 4, teeth 52A for meshing with the chain 53 are formed at equal intervals in the circumferential direction on the outer peripheral portion of the driven sprocket wheel 52, and between these teeth 52A. The recesses (tooth bottoms) 52B are formed at equal intervals in the circumferential direction, and among the many recesses 52B, the claw portions 75B of the ratchet member 75 of the ratchet device 71 engage with the recesses 52B.

  As will be described later, when the chain 53 is cut, the claw portion 75B of the ratchet member 75 of the ratchet device 71 engages with the recess 52B of the tooth 52A of the driven sprocket wheel 52, thereby stopping the rotation of the driven sprocket wheel 52. .

  When the shutter device according to the present embodiment is used for a long period of time and the number of times of opening and closing the shutter curtain 1 has reached a large number, the above-described chain 53 may be broken due to, for example, metal fatigue. 6 and 8 show a case where this cutting has occurred. As illustrated in FIGS. 4 and 7, the ratchet device 71 of the rotation stopping device 70 includes the contact member 79 in which the friction reducing member 80 contacts the outer side surface of the chain 53 by the spring force of the torsion coil spring 76. When the chain 53 is cut, the contact member 79 is rotated about the central shaft 74 by the spring force of the torsion coil spring 76, and the ratchet member 75 to which the contact member 79 is attached is also centered on the central shaft 74. By this rotation, the claw portion 75B of the ratchet member 75 is engaged with the recess 52B of the driven sprocket wheel 52 that is a member that rotates integrally with the winding shaft 13.

  For this reason, even if the chain 53 is cut and thereby the connection between the driving sprocket wheel 50 and the driven sprocket wheel 52 coupled to the driving shaft 49 of the opening / closing device 40 described above is disconnected, the winding shaft 13 and the driven shaft The ratchet device 71 prevents the sprocket wheel 52 from rotating due to the weight of the shutter curtain 1, thereby preventing the shutter curtain 1 from rotating rapidly by rotating the winding shaft 13 with its own weight. The

  When the ratchet member 75 rotates about the central shaft 74, the aforementioned operating member 77 coupled to the ratchet member 75 operates the actuator 72A of the switch 72. A notifying means (not shown) for notifying that the chain 53 has been cut operates. For this reason, in this embodiment, the switch 72 is a detection unit for detecting the breakage of the chain 53 and is a switch unit that is operated by the rotation of the ratchet member 75 when the chain 53 is cut.

  In addition, as shown in FIG. 7, the rotation direction of the winding shaft 13 is an arrow A direction (counterclockwise), while the rotation direction of the ratchet member 75 is an arrow B direction (clockwise). That is, the rotation direction of the winding shaft 13 when the shutter curtain 1 is extended and the rotation direction of the ratchet member 75 are opposite to each other.

Next, the spring characteristic of the torsion coil spring 76 according to this embodiment will be described. In this embodiment, the spring constant of the torsion coil spring 76 is k [N · m / rad], the weight of the shutter curtain 1 fed out from the winding shaft 13 is m [kg], and the gravitational acceleration is g [m / s. ² ], the winding inertia moment is I [kg · m ² ], the inertia moment of the ratchet member 75 is I _d [kg · m ² ], the winding radius of the shutter curtain 1 is R “m”, and the center of gravity winding radius is R _g “M”, the number of teeth of the driven sprocket wheel 52 is Z, the angle of the ratchet member 75 when the chain 53 functions is θ _h [rad], and the angle of the ratchet member 75 when the chain 53 is cut (when function is disabled). When θ _b [rad]

の関係が成立する構成となっている。

The relationship is established.

  FIG. 10 is a simplified side view of members such as the driven sprocket wheel 52, the winding shaft 13, the shutter curtain 1, and the seat plate 17.

  In the above formula (13), the weight m of the shutter curtain 1 fed out from the winding shaft 13 is the curtain main body portion 16 of the shutter curtain 1 fed out from the winding shaft 13 as shown in FIG. And the weight of the seat plate 17 attached to the lower end of the curtain body 16.

  In the above formula (13), the winding inertia moment I is the inertia of an object including the winding shaft 13, the driven sprocket wheel 52, and the shutter curtain 1 that is not drawn out from the winding shaft 13. A moment. That is, it refers to the moment of inertia of an object including an object that rotates together with the take-up shaft 13 in addition to the take-up shaft 13.

In the above formula (13), the winding radius R of the shutter curtain 1 refers to the winding radius of the shutter curtain 1 from the center O of the winding shaft 13 as shown in FIG. On the other hand, in the above formula (13), the center of gravity winding diameter R _g, a take-up shaft 13, a driven sprocket wheel 52, the shutter curtain 1 (curtain body portion is not fed from the take-up shaft 13 16+ winding shaft 13 is the winding radius of the shutter curtain 1 from the center of gravity G of the entire curtain body 16 + seat 17).

  FIG. 11 is a front view of the anti-rotation device 70 when the chain 53 is functioning, that is, before the chain 53 is cut, and FIG. FIG. 6 is a front view of the rotation stopper device 70. In other words, it is a front view of the rotation stopping device 70 when the claw portion 75B of the ratchet member 75 is engaged with the concave portion 52B of the driven sprocket wheel 52. 11 and 12, the covering member 84 that covers the ratchet member 75 constituting the rotation stopper 70 is omitted (omitted).

In the above equation (13), the angle θ _h of the ratchet member 75 when the chain 53 functions is indicated by a two-dot chain line in which the spring torque is 0 (free state) as shown in FIG. The straight line X passing through the center O of the central shaft 74 and the other end portion 76B of the torsion coil spring 76 in a state before the chain 53 is cut are orthogonal to the central shaft 74. An acute angle formed by a straight line Y passing through the center O of 74. Similarly, in the above equation (13), the angle θ _b of the ratchet member 75 at the time of cutting the chain 53 is a state in which the spring torque is 0 (free state) as shown in FIG. A straight line X orthogonal to the other end 76B of the torsion coil spring 76 indicated by a two-dot chain line and passing through the center O of the center shaft 74, and the other end 76B of the torsion coil spring 76 after the chain 53 is cut An acute angle formed by a straight line Z that is orthogonal and passes through the center O of the central axis 74.

The inertia moment about the rotation center axis 74 of the ratchet member 75 is I _d [kg · m ² ], the rotation angle of the ratchet member 75 is θ [rad], the time is t [sec], and the spring of the torsion coil spring 76 When the constant is k [N · m / rad], the equation of motion related to the system of the ratchet member 75 and the torsion coil spring 76 is

となり、この式（１４）の一般解は、

The general solution of equation (14) is

となる。ここで、初期条件ｔ＝０、θ（０）＝θ_ｈ（チェーン５３の機能時におけるラチェット部材７５の角度（図１２参照））及びｔ＝０、ｄθ／ｄｔ＝０より、Ｃ_１＝０、Ｃ_２＝θ_ｈであるから、上記の式（１５）は、

It becomes. Here, from the initial conditions t = 0, θ (0) = θ _h (the angle of the ratchet member 75 when the chain 53 functions (see FIG. 12)) and t = 0, dθ / dt = 0, C ₁ = 0 Since C ₂ = θ _h , the above equation (15) is

となる。また、チェーン５３が切断したときから、ラチェット部材７５の爪部７５Ｂが被動スプロケットホイール５２の凹部５２Ｂに係合するまでの時間はｔ_ｄ（ｓｅｃ）は、上記の式（１６）において、θ（ｔ）＝θ_ｂとして変形すると求められ、

It becomes. The time from when the chain 53 is cut until the claw portion 75B of the ratchet member 75 is engaged with the recess 52B of the driven sprocket wheel 52 is t _d (sec) in the above equation (16), θ ( t) = determined to be deformed as theta _b,

となる。

It becomes.

On the other hand, the moment of inertia of winding is I [kg · m ² ], the weight of the shutter curtain 1 fed out from the winding shaft 13 is m [kg], the acceleration of gravity is g [m / s ² ], When the winding radius is R [m], the center of gravity winding diameter is R _g “m”, and the number of teeth of the driven sprocket wheel 52 is Z [pieces], the rotation angle θ (t )

となる。

It becomes.

If the inter-tooth angle of the driven sprocket wheel 52 (the angle of the interval between the plurality of teeth 52A formed on the outer periphery of the driven sprocket wheel) is θ _m [rad] (see FIG. 10), θ _m = 2π / Z Therefore, the time t _m required for the driven sprocket wheel 52 to rotate by θ _m (in other words, rotate by one tooth) is expressed by the above equation (18), θ (t) = 2π / Z, t = T _m

となる。

It becomes.

Accordingly, while the driven sprocket wheel 52 is rotated interdental angle theta _m, in order to ratchet member 75 enters between the teeth of the driven sprocket wheel 52, it Naritate the relationship t d _{<t m.} That is, according to the above-described formula (17) and formula (19),

の関係が成立すればよい。この式（２０）を以下に示すように変形していくと、

It is sufficient if the relationship is established. When this equation (20) is transformed as shown below,

したがって、本実施形態のねじりコイルばね７６のばね定数ｋは、前述したように、

Therefore, the spring constant k of the torsion coil spring 76 of the present embodiment is as described above.

となっている。

It has become.

Next, the operation of the ratchet member 75 that is rotationally biased by the spring force of the torsion coil spring 76 having the spring constant k will be described with reference to FIGS. The driven sprocket wheel 52 shown in FIG. 7 is in a state immediately before it freely rotates in the direction of arrow A together with the winding shaft 13 by cutting the chain 53, and the driven sprocket shown in FIG. wheel 52, as has the state shown in FIG. 7 in a state just after the rotating interdental angle theta _m, the following description.

As described above, in this embodiment, the torsion coil spring 76 has a time t _d from when the chain 53 is cut until the claw portion 75B of the ratchet member 75 engages with the recess 52B of the driven sprocket wheel 52. The driven sprocket wheel 52 has a spring coefficient k that satisfies a relationship smaller than the time t _m required for rotating θ _m . That is, in the present embodiment, the spring force of the torsion coil spring 76 that urges the ratchet member 75 to rotate is large so that the relationship of t _d <t _m is established.

For this reason, in this embodiment, as can be seen from FIGS. 7 and 8, the pawl of the ratchet member 75 is rotated while the driven sprocket wheel 52 rotates in the direction of arrow A, which is the inter-tooth angle θ _m. The portion 75B is provided between the teeth of the driven sprocket wheel 52, that is, in FIGS. 7 and 8, teeth 52A-1 (hereinafter referred to as “first teeth 52A-1”) and teeth 52A-2 (hereinafter referred to as “second teeth”). Tooth 52 </ b> A- 2 ”) (to be engaged). Thereby, the free rotation of the winding shaft 13 is prevented.

In the case where the torsion coil spring 76 does not have the spring coefficient k that satisfies the above-described relationship of t _d <t _m , the chain 53 is cut to urge the rotation by the spring force of the torsion coil spring 76. The ratchet member 75B of the ratchet member 75 is rotated between the first tooth 52A-1 and the second tooth 52A-2 of the driven sprocket wheel 52 which has started to freely rotate together with the winding shaft 13 by cutting the chain 53. There is a great possibility that the claw portion 75B of the ratchet member 75 is suddenly abutted against the second tooth 52A-2 without being engaged with the recess 52B-1 and suddenly comes into contact with the tip of the second tooth 52A-2. In this case, the ratchet member 75 bounced by the second tooth 52A-2 is rotated again toward the driven sprocket wheel 52 by the rotation biased by the spring force of the torsion coil spring 76. There is a great possibility that the portion 75B will be bounced against the tip of the tooth 52A-3 (hereinafter referred to as “third tooth 52A-3”). On the other hand, since the rotational speed of the driven sprocket wheel 52 gradually increases, thereafter, the claw portions 75B of the sprocket member 75 are successively repelled by the fourth and subsequent teeth 52A, and the claw portions 75B are driven by the driven sprocket wheel 52. There is a great possibility that it will be impossible to engage with the recess 52B. For this reason, the free rotation of the winding shaft 13 cannot be prevented.

However, in this embodiment, the anti-rotation device 70 includes the torsion coil spring 76 having the spring constant k that satisfies the relationship of the above expression (25), so that the chain 53 is cut and the driven sprocket wheel 52 is during the rotation interdental angle theta _m, pawl portion 75B of the ratchet member 75 which is biased pivoting the spring force of the torsion coil spring 76 is engaged with the recess 52B-1 which is between the teeth of the driven sprocket wheel 52 It is like that.

  In other words, in the present embodiment, the ratchet member 75 is quickly rotated toward the driven sprocket wheel 52 by the rotation biased by the spring force of the torsion coil spring 76, so that the claw portion 75B of the ratchet member 75 has the driven sprocket wheel. 52 enters the recess 52B-1 between the first tooth 52A-1 and the second tooth 52A-2.

As a result, the chain 53 is cut, while the take-up shaft 13 rotates interdental angle theta _m, it is possible to prevent the free rotation of the take-up shaft 13.

  For this reason, according to this embodiment, it is possible to more quickly and more reliably prevent the winding shaft 13 from freely rotating due to the weight of the shutter curtain 1 when the chain 53 is cut.

  In this embodiment, depending on the positional relationship between the teeth 52A of the driven sprocket wheel 52 before the chain 53 is cut and the claw portions 75B of the ratchet member 75, in other words, the driven sprocket wheel before the chain 53 is cut. Depending on the angular position of the teeth 52 </ b> A of 52, the pawl portion 75 </ b> B of the ratchet member 75 that is urged to rotate by the spring force of the torsion coil spring 76 by cutting the chain 53 is free to rotate together with the winding shaft 13 by cutting the chain 53. The first sprocket wheel 52 of the driven sprocket wheel 52 that has started moving does not enter the recess 52B-1 between the second tooth 52A-2 and suddenly comes into contact with the tip of the second tooth 52A-2. The claw portion 75B of the ratchet member 75 may be repelled by the teeth 52A-2.

  However, in the present embodiment, the spring force of the torsion coil spring 76 that urges the ratchet member 75 to rotate is large. For this reason, the rotation speed of the ratchet member 75 is reduced by winding the chain 53. This is much faster than the rotational speed of the driven sprocket wheel 52 immediately after starting free rotation together with the shaft 13.

  For this reason, in the present embodiment, as described above, the claw portion 75B of the ratchet member 75 that is rotationally biased by the spring force of the torsion coil spring 76 due to the cutting of the chain 53 causes the winding shaft 13 to be cut off. The tip of the second tooth 52A-2 suddenly enters the recess 52B-1 between the first tooth 52A-1 and the second tooth 52A-2 of the driven sprocket wheel 52 which has started to freely rotate. Even if the claw portion 75B of the ratchet member 75 is bounced by the second tooth 52A-2, the ratchet member 75 bounced by the second tooth 52A-2 is not the spring of the torsion coil spring 76. The claw portion 75B of the ratchet member 75 has the second tooth 5 of the driven sprocket wheel 52 to quickly rotate again to the driven sprocket wheel 52 side by the rotation biasing force. Will be entering into the recess 52B-2 between A-2 and the third teeth 52A-3, thereby, the free rotation of the winding shaft 13 is prevented.

The present embodiment, while the chain 53, when out of the drive sprocket wheel 50 and the driven sprocket wheel 52, the driven sprocket wheel 52 is rotated interdental angle theta _m, times the spring force of the coil spring 76 The pawl portion 75 </ b> B of the ratchet member 75 that is urged by force enters between the teeth of the driven sprocket wheel 52. As a result, the chain 53 is disengaged, while the take-up shaft 13 rotates interdental angle theta _m, it is possible to prevent the free rotation of the take-up shaft 13.

  In the present embodiment, the resistance force of the switch 72 that is a switch means that is operated by the rotation of the ratchet member 75 when the chain 53 is cut is extremely smaller than the spring torque of the torsion coil spring 76. That is, the resistance force of the switch 72, which is a switch means that operates by the rotation of the ratchet member 75 when the chain 53 is cut, is negligibly small compared to the spring torque of the torsion coil spring 76.

  In the present embodiment, the claw portion 75B of the ratchet member 75 is engaged with the recess 52B of the tooth 52A of the driven sprocket wheel 52. However, the driven sprocket wheel 52 is separated from the driven sprocket wheel 52. An integrated rotating member having a plurality of teeth formed in the circumferential direction on the outer peripheral portion is provided, and the claw portion 75B of the ratchet member 75 is engaged with the concave portion of the teeth of the integrated rotating member. Good.

  The possibility that the chain 53 may become nonfunctional due to cutting or coming off the driven sprocket wheel 52 may be high in the following cases. That is, there is a high possibility that the function of the chain 53 will be lost. When the load applied to the chain 53 suddenly increases, for example, the operation starts from a state where the shutter curtain 1 is fully opened or fully closed. Or when the time has not passed since the start of this operation.

  Further, as the operation start direction of the shutter curtain 1 in which the function of the chain 53 is disabled, the moving direction (opening movement direction) is higher than the lowering direction (closing movement direction) of the shutter curtain 1 in relation to the dead weight of the shutter curtain 1. ) Increases the load applied to the chain 53, and thus the possibility of defunctioning of the chain 53 is greater in the upward direction than in the downward direction of the shutter curtain 1. In particular, when the shutter curtain 1 that has been fully closed performs an ascending operation (opening operation), the load applied to the chain 53 increases most rapidly, so that the possibility of the chain 53 becoming non-functional is increased. This can be said that when the shutter curtain 1 moves upward in the opening movement direction from the fully closed state or when the time has not passed so much since the start of the operation, the chain 53 is highly likely to become nonfunctional. .

  According to the present embodiment described above, the shutter curtain 1 has not passed much time since the fully-closed operation, in other words, the shutter curtain 1 has been lifted from the fully-closed state, and the shutter curtain 1 has a very small opening amount. Even if the chain 53 becomes nonfunctional in a state where it is not large, it is possible to quickly prevent the shutter curtain 1 from dropping its own weight (rapid abnormal drop) and to increase the possibility of stopping the shutter curtain 1 before reaching the fully closed state. There is an effect that can.

  FIG. 13 shows an enlarged view of the rotation stopping device according to another embodiment. Of the members constituting the anti-rotation device according to this embodiment described below, the same members as those of the anti-rotation device 70 according to the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  The anti-rotation device 170 according to the present embodiment includes a base member 200 that is detachably fixed to the bracket 11 with a plurality of fixing devices 201 such as screws, and two base members 200 that are opened and closed. Columns 200A projecting in a rod shape toward the machine 40 side, in other words, the winding shaft 13 side, and covering members 184 detachably attached to these column parts 200A with fastening devices 190 and 191; A ratchet member 75 having a thickness dimension corresponding to the height dimension of the column part 200A, and being disposed between the base member 200 and the covering member 184 so as to be rotatable about the central axis 74. It is configured.

  Also in this embodiment, the anti-rotation device 170 is provided with a torsion coil spring 176 serving as an urging means that constantly applies a rotation urging force to the ratchet member 75. The torsion coil spring 176 is provided with the ratchet member 176. The ratchet member 75 is urged to rotate about the central axis 74 toward the side where the claw portion 75B of the member 75 is engaged with the concave portion 52B of the teeth 52A formed on the outer peripheral portion of the driven sprocket wheel 52 in the circumferential direction. doing. One end portion 176A of the torsion coil spring 176 is locked to the column portion 200A of the base member 200, the other end portion 176B is locked to the ratchet member 75, and the coil portion 176C is wound around the trunk portion 75A of the ratchet member 75. It has been turned.

  The torsion coil spring 176 provided in the anti-rotation device 170 according to this embodiment described above also has the same spring characteristics as the torsion coil spring 76 provided in the anti-rotation device 70 according to the above-described embodiment. ing. That is, the spring constant k of the torsion coil spring 176 provided in the anti-rotation device 170 according to the present embodiment also satisfies the relationship of the above equation (25).

  The present invention relates to an opening shutter device for opening and closing an opening such as a doorway or a window with a shutter curtain, and a winding shaft for winding and unwinding a shutter curtain that is rotated by an endless traveling member such as a chain. It can be used for various shutter devices such as a shutter device for disaster prevention for forming a disaster prevention zone with a curtain.

DESCRIPTION OF SYMBOLS 1 Shutter curtain 13 Winding shaft 40 Opening and closing machine which is a drive device 50 Drive sprocket wheel which is a drive rotation member 52 Driven sprocket wheel which is a driven rotation member 53 Chain which is an endless traveling member 70 Anti-rotation device 75 Ratchet member 75B Ratchet member Claw part which is engaging part 76 Torsion coil spring which is spring 52A, 52A-1, 52A-2, 52A-3 Tooth of driven sprocket hole 79 Contact member which is contact part 72 Switch means which is detecting means k Spring spring Constant m Weight of shutter curtain fed out from winding shaft g Gravitational acceleration I Moment of inertia of winding I _d Moment of inertia of ratchet member R Rolling radius of shutter curtain R _g Center of gravity winding Z Number of teeth of driven sprocket wheel θ _h chain Lattice when functioning Angle of the ratchet member during non-functioning of the angle theta _b chain of Tsu bets member

Claims (6)

A driven rotating member attached to a take-up shaft for taking up and feeding out the shutter curtain whose vertical direction is the opening and closing movement direction;
A driving rotating member attached to a driving device for rotating the winding shaft;
An endless traveling member that is wound around the driven rotating member and the driving rotating member, and transmits the rotational driving force of the driving device from the driving rotating member to the driven rotating member;
The outer peripheral portion of the driven rotating member or the integrated rotating member integrated with the driven rotating member has an engaging portion that can be engaged with a plurality of teeth formed in a circumferential direction, and rotates around a central axis. A movable ratchet member, a spring that constantly urges the ratchet member toward the driven rotating member, and a contact portion that contacts the endless running member with the biasing force of the spring when the endless running member functions When the endless traveling member is rendered nonfunctional, the engaging portion engages with the tooth of the driven rotating member or the integrated rotating member by the biasing force of the spring, thereby An anti-rotation device that stops rotation;
In the shutter curtain rapid abnormal drop prevention device of the shutter device equipped with
The spring constant of the spring is k, the weight of the shutter curtain fed out from the winding shaft is m, the gravitational acceleration is g, the winding inertia moment is I, the inertia moment of the ratchet member is I _d , and the shutter curtain is , The center of gravity winding diameter is R _g , the number of teeth of the driven rotating member is Z, the angle of the ratchet member is θ _h when the endless traveling member is functioning, and the endless traveling member is nonfunctional When the angle of the ratchet member is θ _b

A shutter curtain rapid abnormal drop prevention device for a shutter device, characterized in that:   2. The shutter curtain rapid abnormal drop prevention device according to claim 1, wherein the rotation direction of the winding shaft when the shutter curtain is extended and the rotation direction of the ratchet member are opposite to each other. Shutter curtain rapid abnormal drop prevention device characterized by   3. The shutter curtain rapid abnormal drop prevention device for a shutter device according to claim 1 or 2, further comprising a detecting means for detecting non-functioning of the endless traveling member. Abnormal drop prevention device.   4. The shutter curtain rapid abnormal drop prevention device for a shutter device according to claim 3, wherein the detection means is a switch means that is actuated by rotation of the ratchet member when the endless running member is rendered non-functional. Shutter curtain rapid abnormal drop prevention device for the shutter device to do.   5. The shutter curtain rapid abnormal drop prevention device according to claim 1, wherein the endless traveling member is a chain, the driving rotating member is a driving sprocket wheel, and the driven rotating member is a driven sprocket. A shutter curtain rapid abnormal drop prevention device for a shutter device characterized by being a wheel.   6. The shutter curtain rapid abnormal drop prevention apparatus for a shutter apparatus according to claim 1, wherein the spring is a torsion coil spring.

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