JP3481750B2 - Braking device for electric shutter switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release a brake disc easily by relatively coupling an armature to the brake disc rotatably and engaging a lock piece with the engaging recessed section of the brake disc in an operating piece annexed and contacted to the outer-circumferential cam surface of the armature. SOLUTION: The state, in which a chain is pulled continuously and an operating piece 38 is slid and contacted on the cam surfaces 23 of an armature 15, and the state, in which a lock piece 27 is slid and contacted on the outer circumferential surfaces 24b of a brake disc 16, are repeated alternately, and the armature 15, the brake disc 16 and a brake wheel 7 are roated without engaging the lock piece 27 with engaging recessed sections 24. A shaft 5 is turned in the direction of shutter wind-up by manual operation, and a shutter is wound up and opened. When a hand pulling the chain is loosened, a pawl member 26 for a latchet mechanism 25 is engaged with the engaging recessed section 21 of the brake disc 16. Accordingly, the locking of the brake disc 16 can be released by manually operating the armature 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for an electric shutter opening / closing machine having a manual winding mechanism.

[0002]

2. Description of the Related Art Conventionally, as a braking device for an electric shutter opening / closing device of this type, there is one disclosed in, for example, Japanese Utility Model Laid-Open No. 1-118084. In the braking device disclosed in this publication, a non-excitation actuated electromagnetic brake with a manual hoisting mechanism is arranged on the shaft end side of a drive shaft of an electric shutter opening / closing machine so that the axis line of the drive shaft is the same as that of the drive shaft. When the brake is stopped, the brake disc of the electromagnetic brake is moved in the axial direction by the spring force to be frictionally engaged with the brake wheel on the drive shaft side.

In the electromagnetic brake, an annular field core is fixed to the inner bottom portion of a substantially cylindrical brake case, and a brake shaft penetrating the field core is axially moved at the axial center of the case. The brake shaft is freely provided, and the armature and the brake disc are fixed to the end of the brake shaft on the drive shaft side. The electromagnetic coil of the field core is connected in parallel with the power supply circuit of the shutter opening / closing motor, and is configured to be excited when the motor is supplied with power.

The brake shaft extends axially in the hollow portion on the axial center side of the field core, penetrating the axial end side closed portion of the brake case, and is movable in the axial direction on the inner peripheral surface of the field core. The bearing member fitted so as to be rotatably supported, and the closed portion rotatably and axially movable. In addition, by pressing the bearing member against the armature between the bearing member and the closing portion in the hollow portion on the axial center side of the field core, the brake disc is provided when the electromagnetic brake is in a non-excited state. A compression coil spring for braking that is frictionally engaged with the brake wheel of the drive shaft is mounted.

The brake disc has a large number of engagement recesses formed on the outer peripheral surface thereof, and a lock piece provided on the brake case side is engaged with the engagement recesses to rotate with respect to the brake case. Regulated. The lock piece is attached to the brake case so as to be movable along the radial direction of the brake disc, and is biased by a spring member so that the tip end portion is pressed against the outer peripheral surface of the brake disc.

The support structure of the lock piece will be described in detail. The lock piece is formed into a substantially columnar shape having a flange on its outer peripheral surface and fitted in a support hole of the brake case. A compression coil spring is elastically mounted between the side support hole closing plate and the side support hole closing plate so as to be movably supported by the brake case while being biased toward the brake disc. Further, the lock piece projects from the support hole closing plate to the outside of the brake case, and the operating piece is connected to the projecting end portion. This operating piece is swingably attached to the brake case and constitutes a part of a manual hoisting mechanism described later.

In the conventional braking device described above, the armature is compressed through the bearing member when the electromagnetic coil of the electromagnetic brake is not excited, that is, when the power supply to the shutter opening / closing motor is cut off. The elastic force of the coil spring moves together with the brake shaft in the direction away from the field core. As a result, the brake disc frictionally engages with the brake wheel on the drive shaft side of the shutter opening / closing device. At this time, since the lock piece of the brake disc engages with the engagement recess and the rotation thereof is restricted, the drive shaft of the shutter opening / closing machine is braked.

When the shutter opening / closing motor is energized to electrically open / close the shutter, the electromagnetic coil is excited and the armature is magnetically attracted to the field core against the elastic force of the compression coil spring for braking. At the same time, the brake shaft and the brake disc move in the direction away from the brake wheel. As a result, the frictional engagement between the brake disc and the brake wheel is released, and the drive shaft is rotationally driven by the shutter opening / closing motor to open / close the shutter. Then, by stopping the power supply to the shutter opening / closing motor and stopping it, the electromagnetic coil of the electromagnetic brake is de-energized as described above, and the brake disc frictionally engages with the brake wheel, and the shutter opening / closing motor The drive shaft is braked.

The manual hoisting mechanism has a structure for manually rotating the brake disc and the brake wheel to the shutter hoisting side while maintaining the frictional engagement state in the event of a power failure or emergency. In this manual hoisting mechanism, the boss portion of the brake disc is mounted so as to be rotatable by a fixed angle relative to the brake disc, and a chain engaging groove and a large number of protruding cams are provided on the outer peripheral surface. It is composed of a chain wheel, a lock release lever provided on the brake case, the operating plate, and the like.

When the chain wheel is rotatably connected to the brake disc by a fixed angle, a hole is formed in the axial center of the chain wheel so that the boss portion of the brake disc is rotatably fitted. The opening is made, and notches extending outward in the radial direction are provided at two locations in the diametrical direction of the hole, and threaded pins erected on the brake disc are inserted into these notches. That is, the chain wheel can be rotated relative to the brake disc until the connecting pin hits the side wall of the cutout.

The lock release lever has a structure in which a swinging end portion is engaged with the protruding cam and abuts against the operating plate on the lock piece side from the inside of the brake case. That is, when the chain wheel rotates, the swinging end portion of the lock release lever is pushed by the protruding cam of the chain wheel and moves to the outside in the radial direction of the chain wheel. Will be pushed away from the brake case.
As the actuation plate swings in this manner, the lock piece integrally provided with the actuation plate moves radially outward of the brake disc, that is, in the direction in which the engagement with the engagement recess is released. In this lock release lever, the elastic force of the compression coil spring for urging the lock piece toward the engaging side acts on the swinging end portion via the operating plate, so that the swinging end portion has the protrusion shape. It is kept in contact with the cam.

According to the manual hoisting mechanism thus constructed, when the chain wound around the chain wheel is pulled so that the chain wheel turns to the shutter hoisting side, the chain wheel turns at a certain angle with respect to the brake disc. As a result, the lock release lever swings to move the lock piece outward in the radial direction of the brake disc against the elastic force of the spring member. As a result, the engagement state of the lock piece is released. By further pulling the chain with the brake disc unlocked by the lock piece, the chain wheel, the brake disc, the brake wheel, and the drive shaft of the shutter opening / closing mechanism rotate together toward the shutter winding side. , The shutter opens manually.

When the chain wheel further rotates and the swinging end of the lock release lever is positioned between the protruding cams, the lock release lever cannot be pushed to the lock release side, but the manual hoist In the mechanism, the protruding cam and the engaging recess are formed to have an equal pitch, and the chain wheel has a pitch of about 1 of the above pitch.
Since both of them rotate together as a whole when turning to the brake disc by 1/2, at this time, the lock piece comes into contact with the convex portion between the engaging concave portions and locks. The released state is maintained. That is, by continuing to pull the chain, the state in which the lock release lever is pushed by the convex portion of the protruding cam and the state in which the lock piece slides in the convex portion between the engaging concave portions are alternately repeated, and the chain wheel and The brake disc rotates and the shutter can be continuously wound up.

Further, the manual winding mechanism is provided with a return mechanism which automatically returns the brake disc to the locked state when the pulling of the chain is stopped when the winding is completed or the shutter is stopped halfway. This return mechanism is a ratchet mechanism that engages with the engaging recess of the brake disc to achieve the same effect as a one-way clutch, and a lock piece that is returned by returning the chain wheel that is displaced in the winding direction with respect to the brake disc. Is re-engaged with the engaging recess.

In the ratchet mechanism, a pawl member is swingably attached to a brake case, a tip of the pawl member is engaged with the engaging recess by elastic force of a spring member, and a brake disc is rotated only in a winding direction of a shutter. It has a structure that allows it. The ratchet mechanism has a structure that restricts the rotation of the brake disc only when the engagement member is positioned at a position facing the lock piece.

The spring mechanism has a structure in which a pair of connecting pins are erected on the chain wheel, and a tension coil spring is elastically mounted between the connecting pins and the connecting pin of the brake disc. The tension coil spring elastically holds the chain wheel with respect to the brake disc so that the portion between the protrusion-shaped cams and the engagement recess are positioned at the same position in the circumferential direction when viewed in the axial direction. Is configured as follows. The tension coil spring is accommodated here by forming a space between the chain wheel and the brake disc by forming a thin wall near the opening edge of the hole at the axial center of the chain wheel.

That is, when the shutter is manually wound up or when the user pulls the chain when the shutter is stopped during winding, the brake disc is reversely rotated by the weight of the shutter and the elastic force of the tension coil spring. , The ratchet engaging the engaging recess,
The chain wheel returns to the initial position with respect to the brake disc by the elastic force of the tension coil spring, and the lock piece engages with the engaging recess, whereby the lock state in which the rotation toward the shutter closing side is restricted is achieved.

[0018]

However, in the conventional braking device with a manual hoisting mechanism constructed as described above, the manual hoisting mechanism has a complicated structure, so that it cannot be easily assembled and the productivity is low. There was a problem. This requires that two swinging members, an actuating plate coupled to the lock piece and a lock release lever that drives the actuating plate, be attached to the brake case, which complicates the assembly work of these members. Because it will be.

Further, the conventional braking device with a manual hoisting mechanism has a problem that the manufacturing cost becomes high because the brake disc and the chain wheel have a complicated shape. That is, in order to connect the chain wheel to the brake disc so that it can rotate at a fixed angle, the bearing surface for the chain wheel must be formed on the boss portion of the brake disc. A notch facing the side connecting pin and a thin portion for accommodating the tension coil spring must be formed in the axial center portion.

Further, the conventional braking device with a manual hoisting mechanism has a problem that the resistance during hoisting gradually increases as the number of manual hoisting operations increases. This is because the bearing member fitted to the inner peripheral surface of the field core is pressed against the armature by the braking compression coil spring when the armature is biased in the direction away from the field core.

That is, during manual winding, the armature rotates relative to the bearing member while the bearing member is pressed against the end face of the armature so as to make surface contact, so that the bearing member having a hardness higher than that of the armature. Is rubbed by the armature. For this reason, if the number of manual winding operations increases, the end face becomes rough and sliding resistance increases.

The present invention has been made in order to solve such a problem, and its first object is to simplify the manual hoisting mechanism to improve productivity, and it is relatively different from the brake disc at the time of manual hoisting. A second object is to reduce the manufacturing cost by making both the rotating manual rotating body for unlocking and the brake disc simple in shape, and the resistance may increase even if the number of manual winding operations increases. The third purpose is to prevent it.

[0023]

According to a first aspect of the present invention, there is provided a braking device for an electric shutter opening / closing device, wherein a brake disc frictionally engaged with a brake wheel of a drive shaft for the electric shutter opening / closing device is provided with a non-excitation actuated electromagnetic brake. Armatures are arranged adjacent to each other and connected so as to be relatively rotatable by a fixed angle.A cam surface composed of a concave portion and a convex portion is provided on the outer peripheral surface of this armature, and a spring is provided on the fixing member side of the electromagnetic brake. A member is urged toward the axial center of the electromagnetic brake to movably support a working piece that is engaged with the cam surface from the outside in the radial direction, and is movably supported in the radial direction. Movement of the actuating piece which is engaged with the engaging lock piece and is moved by being pushed by the convex portion by the armature rotating relative to the brake disc between the cam surface and the actuating piece. However, since the engaging length of the lock piece is longer than that of the engaging recess, the actuating piece and the locking piece move integrally to the outside in the radial direction when the armature is manually rotated with respect to the brake disc. The brake disc is unlocked.

Therefore, in transmitting the operating force from the operating piece driven by the armature to the lock piece,
This operation force transmission system can be performed without interposing a member that moves relative to both the members.

A braking device for an electric shutter opening / closing device according to a second aspect of the present invention is the braking device for an electric shutter opening / closing device according to the first aspect of the present invention, wherein a plurality of connecting pins provided upright on the armature are inserted into the through holes of the brake disc. Then, an axial movement restricting member for a brake disc is attached to the tip of the connecting pin, and the through hole is formed so that the connecting pin is movable in the circumferential direction of the brake disc.
Since the armature and the brake disc are connected by elastically holding the connecting pin in the through hole so as to be located at the central portion in the circumferential direction, the spring member that gives the armature a habit of returning is accommodated in the through hole of the brake disc. The rotation angle of the armature that rotates relative to the brake disc can be set by the opening shape of the through hole.

A braking device for an electric shutter opening / closing device according to a third aspect of the present invention is the braking device for an electric shutter opening / closing device according to the first or second aspect, wherein a field core formed in an annular shape near the outer peripheral edge of the armature. Since the armature is rotatably and slidably supported in the axial direction by the field core through the rollers provided on the outer peripheral surface of the electromagnetic brake, the armature is connected to the brake shaft of the electromagnetic brake. The brake shaft can be rotatably and axially movably supported by the field core via the armature and the rollers.

[0027]

DETAILED DESCRIPTION OF THE INVENTION

First Embodiment An embodiment of a braking device for an electric shutter opening / closing apparatus according to the first invention and the second invention will be described in detail with reference to FIGS. 1 to 7.

FIG. 1 is a vertical sectional view of a braking device for an electric shutter opening / closing apparatus according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG.
(A), (b) -FIG.7 (a), (b) is a figure for demonstrating operation | movement of a manual hoisting mechanism. 4 (a), (b)
Shows a locked state, FIGS. 5 (a) and 5 (b) show a state in which the brake disc is unlocked, and FIG.
7B shows a state where the operating piece has reached the top of the cam surface, and FIGS. 7A and 7B show a state where the lock piece is in sliding contact with the convex portion between the engaging concave portions. There is. In addition, FIG.
In FIG. 7, (a) is a structural view of the main part of the manual hoisting mechanism as viewed from the axial direction of the electromagnetic brake, and (b) is a structural view showing the positional relationship between the through hole of the brake disc and the connecting pin.

In these figures, reference numeral 1 denotes a braking device for an electric shutter opening / closing device according to this embodiment. In this braking device 1, a non-excitation actuated electromagnetic brake 3 is arranged on a shaft end side of a motor 2 for a shutter opening / closing device. In addition, the electromagnetic brake 3 is provided with a manual hoisting mechanism 4. The rotating shaft 5 of the motor 2 has a motor housing 6
And the brake wheel 7 is attached to the protruding end portion in a state where the brake wheel 7 is prevented from rotating by the key 5a.

A shutter opening / closing machine is connected to the other end of the rotary shaft 5 (not shown), and the rotary shaft 5 is driven by the motor 2 to rotate to open a shutter (not shown). It has a structure that can be closed. The brake wheel 7 has a friction plate 7a fixed to the end surface on the electromagnetic brake side.

The braking device 1 brakes the shutter opening / closing device by frictionally engaging a brake disc 16 of the electromagnetic brake 3 which will be described later with the brake wheel 7 or separates the brake disc 16 from the brake wheel 7. It has a structure that releases braking. The electromagnetic brake 3 is mounted on the shutter opening / closing side by assembling each of the components described below in a case 8 formed in a substantially bottomed cylindrical shape and fixing the open end of the case 8 to the shaft end of the motor housing 6. It is attached integrally.

At the inner bottom of the case 8, a field core 10 formed in an annular shape and having an electromagnetic coil 9 provided therein is fixed, and a shaft hole 8a is provided at the shaft center portion to which a brake shaft 11 is provided. Have penetrated. The electromagnetic coil 9 is
It is connected in parallel with the power supply circuit of the motor 2, and is configured to be excited when power is supplied to the motor 2 and to be in a non-excitation state when power supply to the motor 2 is cut off.

The brake shaft 11 is formed with a length such that it penetrates the case 8 from the vicinity of the shaft end of the rotary shaft 5 and projects outside the case, and the axial center of the shaft hole portion 8a and the field core 10 is formed. A bearing member 12 fitted in the hollow side portion supports the bearing member 12 so as to be rotatable and axially movable. The brake shaft 11 is positioned on the same axis as the rotary shaft 5.

The bearing member 12 is fitted in the hollow portion of the field core 10 so as to be movable at least in the axial direction with respect to the field core 10. A compression coil spring 13 for braking, which urges an armature 15 described later in a direction of separating from the field core 10, is mounted between the bearing member 12 and the inner bottom surface of the case 8.

A chain wheel 14 is fixedly attached to the end of the brake shaft 11 on the outside of the case. The chain wheel 14 is for winding a chain (not shown), and is rotationally driven by pulling the chain when the shutter is manually wound.

An armature 15 and a brake disc 16 which are formed in a substantially disc shape are mounted on the shaft end of the brake shaft 11 which is the inside of the case. The armature 1
The brake shaft 11 is attached to the brake shaft 11 so that the rotation of the brake shaft 11 is transmitted through a spring pin 17 that is press-fitted into the brake shaft 11 and erected upright. The brake disc 16 has a shaft center portion which penetrates the brake shaft 11 to be supported by the brake shaft 11, and is connected to the armature 15 via a connecting pin 18. The brake disc 16 is positioned so as to face the axial end surface of the brake wheel 7. In addition, at the shaft end of the brake shaft 11,
A stopper 11a is attached to prevent the brake disc 16 from falling off.

The connecting pin 18 is, as shown in FIG.
Three armatures 15 are erected at equal intervals in the circumferential direction and fixed to the armature 15 so as to be parallel to the axial direction. The connecting pin 18 is inserted into the through hole 19 formed in the brake disc 16, and the brake disc 16 is separated from the armature 15 at the protruding end projecting from the brake disc 16 to the side opposite to the armature 15. A stopper 20 is provided to prevent the return compression coil spring 22 from falling off while restricting its movement. This connecting pin 18
In connecting the brake disc 16 to the armature 15, the brake disc 16 is prevented from moving in the axial direction with respect to the armature 15 with the thrust washer 21 interposed therebetween.

The through hole 19 through which the connecting pin 18 is inserted.
As shown in FIG. 3, the brake disc 1 has an opening shape.
The brake disc 16 is opened at three locations corresponding to the connecting pins 18 so as to have a substantially circular arc shape extending in the circumferential direction. The opening width of the through hole 19 (the opening dimension in the radial direction of the brake disc 16) is larger at the central portion in the longitudinal direction than at both ends by a step, and the connecting pin 18 is inserted through this wide portion.

In the wide portion, the opening width is set to be slightly larger than the outer diameter of the connecting pin 18 so that the connecting pin 18 can move in the peripheral direction of the brake disc 16, and the width is set in advance in the peripheral direction. It is formed to extend only. Both ends in the longitudinal direction of the through hole 19 are formed so that the opening width is smaller than the outer diameter of the connecting pin 18.
That is, the connecting pin 18 inserted into the through hole 19
Can move in the circumferential direction of the brake disc 16 in the wide portion until it comes into contact with the restriction surfaces 19a formed of the step portions formed at both ends of the wide portion. As a result, the armature 1
5 is that the connecting pin 18 is movable in the through hole 19,
That is, it becomes possible to relatively rotate by a fixed angle.

In the through hole 19, the connecting pin 1
Return compression coil springs 22 for elastically holding 8 in the substantially central portion of the through hole 19 in the longitudinal direction are elastically mounted on both sides of the connecting pin 18, respectively. Therefore, when the rotating force applied to the armature 15 is stopped while the armature 15 is rotated relative to the brake disc 16, the elastic force of the compression coil spring 22 causes the armature 15 to return to its original position. Incidentally, the relative position of the armature 15 with respect to the brake disc 16 when the connecting pin 18 is elastically held in the center of the through hole 19 as described above, without the rotational force being applied to the armature 15, is hereinafter referred to as a neutral position. .

As shown in FIG. 2, a large number of cam surfaces 23 are formed on the outer peripheral portion of the armature 15. The cam surface 23 is composed of a projection 23a which is arcuate in the axial direction and projects outward in the radial direction, and an arcuate recess 23b which is continuous with the projection 23a and is recessed inward in the radial direction. These are arranged by arranging them all over the outer circumference of the armature 15. In this embodiment, the protrusion 23a and the recess 23b are arranged at positions where the outer circumference of the armature 15 is divided into 11 equal parts.

Further, as shown in FIG. 3, a large number of engaging recesses 24 are formed on the outer peripheral portion of the brake disc 16 by partially recessing the outer peripheral surface of the brake disc inward in the radial direction. The engagement recesses 24 are arranged at positions where the outer periphery of the brake disc 16 is divided into 11 equal parts, and side walls on both sides in the circumferential direction are formed flat so as to extend in the radial direction of the brake disc 16. In addition, the engagement recess 24
The outer peripheral surface 24b, which is located between the bottom surface 24a and the engaging recesses 24 and is located radially outside of the bottom surface 24a, is an arc surface centered on the axial center of the brake disc 16. Is formed.

The concave portion 23b of the cam surface 23 and the engaging concave portion 24 are shown in FIG. 2 in a state where the armature 15 and the brake disc 16 are assembled to the brake shaft 11 and the armature 15 is positioned at the neutral position. As shown, it is formed so as to be positioned at the same position in the circumferential direction. In addition, in this embodiment, the top surface of the projection 23a on the cam surface 23 is formed so as to be positioned radially outward of the outer peripheral surface 24b of the brake disc 16, and the top surface of the recessed portion 23b on the cam surface 23 is formed. Are formed so as to be positioned radially inward of the bottom surface 24a of the engagement recess 24.

The armature 15 constructed as described above.
And electromagnetic brake 3 with brake disc 16
When the electromagnetic coil 9 is in a non-excited state because the power supply to the shutter opening / closing motor 2 is cut off, the armature 15 opens and closes the shutter together with the brake shaft 11 and the brake disc 16 by the elastic force of the braking compression coil spring 13. The brake disc 16 moves to the machine side and frictionally engages with the friction plate 7a of the brake wheel 7.

When the shutter opening / closing motor 2 is supplied with electric power and the electromagnetic coil 9 is excited, the armature 1 is released.
5 moves in the opposite direction to the above against the elastic force of the braking compression coil spring 13 and is magnetically attracted to the field core 10. As a result, the frictional engagement between the brake disc 16 and the brake wheel 7 is released and the rotary shaft 5 rotates.
In this embodiment, when the shutter opening / closing device winds up the shutter, the rotary shaft 5 is configured to rotate in a direction indicated by a white arrow in FIGS. 2 and 3, that is, clockwise in FIG. .

When the electric power to the motor 2 is cut off by stopping the electric opening and closing of the shutter, the brake disc 16 is frictionally engaged with the brake wheel 7 as described above. At this time, by holding the brake disc 16 in a non-rotatable manner, the brake wheel 7 and the rotary shaft 5 are braked by frictional resistance, and the shutter opening / closing device can be locked. To hold the brake disc 16 in a non-rotatable state, as shown in FIG. 3, the pawl member 2 of the ratchet mechanism 25 disposed on the side of the brake disc 16 is provided.
6 and the lock piece 27 are engaged with the engaging recess 24, respectively.

The ratchet mechanism 25 has a structure similar to that of a pawl type one-way clutch, and the brake disc 16 is configured to be rotatable only in the shutter winding direction. More specifically, this ratchet mechanism 25 is provided on one side of the case 8 with the brake disc 1
6, a pawl member 26 is swingably supported by a ratchet accommodating portion 8b integrally provided so as to project and open to the side of the pawl 6 via a support shaft 25a, and a swing end portion of the pawl member 26 is a spring described later. The brake disc 16 is driven by the biasing drive pin 28.
It has a structure to be brought into contact with the outer peripheral portion of the. The thickness of the pawl member 26 is set to a dimension such that the engagement state with the engagement recess 24 can be maintained even if the brake disc 16 moves in the axial direction. Further, the claw member 26 is formed with engagement recesses 26a and 26b with which the pin heads of the drive pins 28 are engaged.

The opening of the ratchet housing 8b is closed by a support plate 29 screwed to the ratchet housing 8b. The drive pin 28 is supported in the elongated hole 29a of the support plate 29 in a penetrating state, and the compression coil spring 30 is provided between the pin head and the inner surface of the case of the support plate 29.
Is armed with. That is, in this embodiment, as shown in FIG.
Although the counterclockwise rotation is restricted in the above, when the clockwise rotation opposite to this is restricted, the compression coil spring 30
The drive pin 28 in the elongated hole 29a is moved against the resilience of the drive pin, and the head portion of the drive pin 28 is engaged with the engaging recess 26b.

The lock piece 27 is formed in a trapezoidal shape as viewed in the axial direction shown in FIG. 3, and in a state where the lock piece 27 is laterally oriented so that the upper side of the trapezoid is positioned on the brake disc 16 side,
It is supported by the case 8 via an engagement mechanism 31 described later. Further, the thickness of the lock piece 27 is set to such a dimension that the engagement state with the engagement recess 24 can be maintained even if the brake disc 16 moves in the axial direction. The tip of the lock piece 27, which is the upper side of the trapezoid, has the engagement recess 24.
The opening width is smaller than the opening width.

The engagement mechanism 31 is supported by a lock piece accommodating portion 8c provided on a side portion of the case 8 opposite to the ratchet accommodating portion 8b with the brake disc 16 interposed therebetween. The lock piece accommodating portion 8c is provided integrally with the case 8 so as to project to the side of the brake disc 16 and open similarly to the ratchet accommodating portion 8b.
The engagement mechanism 31 includes a support plate 32 fixed to the lock piece accommodating portion 8c so as to close an opening portion thereof, and guide rods 33 vertically provided on both upper and lower sides of the support plate 32 so as to project laterally. 33, a connecting member 34 penetrating the guide rods 33 and slidably supported by the guide rods 33, and an engaging compression coil spring 35 for urging the connecting member 34 toward the brake disc 16 side. There is.

The support plate 32 has a through hole 32a for allowing the lock piece 27 and an actuating piece 38, which will be described later, to be opened at the center thereof, and is attached to the lock piece accommodating portion 8c by a fixing screw (not shown). There is. The guide rod 33 is formed in a cylindrical shape, and a fixing screw 36 is inserted into the hollow portion from the protruding end side, and the tip of the fixing screw 36 is screwed to the supporting plate 32 to be fixed to the supporting plate 32. . The engaging compression coil spring 35 is held by the guide rod 33 by inserting the guide rod 33 into the shaft center portion thereof, and the engaging compression coil spring 35 is provided between the projecting end of the guide rod 33 and the head of the fixing screw 36. It is elastically mounted between the interposed spring receiving plate 37 and the connecting member 34.

The connecting member 34 is provided integrally with the plate-shaped portion 34a through which the guide rod 33 penetrates so as to project a pair of connecting plates 34b toward the brake disc 16 side.
The support rod 34c is attached to these connecting plates 34b by the brake shaft 11
It is formed by fixing it in a state of straddling it so that it is parallel to. The lock piece 27 is fixed to the support rod 34c while penetrating it.

According to the engaging mechanism 31 constructed as described above, the connecting member 34 is urged toward the brake disc 16 by the elastic force of the engaging compression coil spring 35 to lock the connecting member 34 as shown in FIG. The piece 27 faces the through hole 32a of the support plate 32, and its tip end engages with the engaging recess 24 of the brake disc 16.

This lock piece 27 is the brake disc 16.
By engaging with the engaging recess 24, rotation of the brake disc 16 is restricted, and braking is performed if the electromagnetic coil 9 is in a non-excited state. The ratchet mechanism 25
Limits only rotation of the brake disc 16 in the direction in which the shutter is closed (counterclockwise in FIGS. 2 and 3).

Further, in addition to the lock piece 27, as shown in FIG. 2, an actuating piece 38 that is in contact with the cam surface 23 of the armature 15 is fixed to the support rod 34c of the connecting member 34. The operating piece 38 is arranged at a position outside the armature 15 in the radial direction and adjacent to the lock piece 27. The end of the actuating piece 38 on the armature 15 side is formed so that the vertical width becomes gradually narrower toward the armature 15, and a circular arc surface 38a that is arcuate when viewed in the axial direction is formed at the tip.

The arcuate surface 38a is positioned in the radial direction of the electromagnetic brake 3 in the axial direction shown in FIG. 2 along with the tip end surface of the lock piece 27 when the operating piece 38 is assembled to the connecting member 34 together with the lock piece 27. Are formed to match. Therefore, when this embodiment is adopted, as shown in FIG. 2, in the locked state in which the lock piece 27 is engaged with the engagement recess 24, between the arc surface 38a and the recess 23b of the cam surface 23 is provided. A gap S is created in the space.

The manual hoisting mechanism 4 releases the engagement between the engagement recess 24 and the lock piece 27, and while the brake disc 16 is frictionally engaged with the brake wheel 7, it is rotated in the shutter hoisting direction to release the shutter. The chain wheel 14 and the brake shaft 1 are provided for manual opening.
1, armature 15, engagement mechanism 31, and operating piece 38
Etc.

In the manual hoisting mechanism 4, the lock piece 27 is moved to the outer side in the radial direction of the brake disc 16 (lock release side) by utilizing the rotational force in the hoisting direction generated by pulling the chain wound around the chain wheel 14. ), Armature 15, brake disc 1
6 and the brake wheel 7 are integrally rotated. When moving the lock piece 27 to the unlocking side, the armature 15 is rotated relative to the brake disc 16 against the elastic force of the return compression coil spring 22 in the through hole 19, and the cam surface 23 of the cam surface 23 is rotated. Protrusion 2
3a is pressed against the operating piece 38 and moved outward in the radial direction.

The operating piece 38 and the lock piece 27 are connected to each other by the connecting member 3.
Since they are connected via 4, the operating piece 38 moves as described above, so that the lock piece 27 moves to the unlocking side. Further, the armature 15 rotates relatively to the brake disc 16 and the connecting pin 18 contacts the regulation surface 19a of the through hole 19, whereby the armature 15, the brake disc 16 and the brake wheel 7 rotate in the same direction.

Further, in this braking device 1, in order to close the shutter by manual operation, as shown in FIG. 1, a braking release lever 39 is arranged at a portion of the brake shaft 11 between the chain wheel 14 and the case 8. is doing. The brake release lever 39 penetrates the brake shaft 11 and holds the brake shaft 11 so that the brake shaft 11 can swing in the axial direction.
The pressing plate 40 fixed to No. 1 and the shaft hole portion 8a of the case 8 are clamped and held. Also, this brake release lever 39
Has a projection 39a projecting from the portion facing the abutting plate 40.

In the braking device 1 configured as described above, when the shutter opening / closing motor is electrically operated to open or close the shutter, the electromagnetic coil 9 is in the excited state and the armature 15 is as described above. Since the magnetic field is magnetically attracted to the field core 10, the brake wheel 7 is not braked. At this time, chain wheel 1
When the chain wound around 4 is not pulled, the armature 15 is positioned at the neutral position by the elastic force of the return compression coil spring 22. That is, as shown in FIG. 2, the operating piece 38 is not in contact with the cam surface 23 of the armature 15, and the locking piece 27 is in the engaging compression coil spring 35.
Is engaged with the engaging recess 24 of the brake disc 16 by being urged by the elastic force of. At this time, the claw member 26 of the ratchet mechanism 25 is also engaged with the engaging recess 24 at a position corresponding to this.

In this state, when the power supply to the shutter opening / closing motor 2 is cut off and stopped, the electromagnetic coil 9 is de-excited and the armature 15 and the brake disc 16 move to the brake wheel 7 side to brake. Frictionally engages the wheel 7. As described above, the claw member 26 and the lock piece 27 are provided in the engaging recess 24 of the brake disc 16.
Therefore, when the brake wheel 7 is rotating in the shutter lowering direction, the rotation of the brake disc 16 is restricted by both the claw member 26 and the lock piece 27, and the brake wheel 7 is braked. To be done. When the brake wheel 7 is rotating in the shutter winding direction, the lock piece 27 causes the brake disc 16 to rotate.
Is restricted and the brake wheel 7 is braked.

In order to close the shutter that has been opened in the event of a power failure or emergency, the brake release lever 39 is swung so that the swing end side approaches the chain wheel 14, as indicated by the chain double-dashed line in FIG. . In this way, the portion of the upper end of the brake release lever 39 that is in contact with the shaft hole 8a of the case 8 serves as a fulcrum, and the projection 39a moves the contact plate 11a to the position indicated by the alternate long and two short dashes line by the lever action. . Since the backing plate 11a is provided integrally with the brake shaft 11, this swing causes the armature 15 and the brake disc 16 together with the brake shaft 11 to move in the same direction against the elastic force of the braking compression coil spring 13. .

As a result, the frictional engagement between the brake disc 16 and the brake wheel 7 is released so that the rotary shaft 5 can freely rotate, and the shutter is lowered by its own weight and closed.

To wind the shutter manually, pull the chain wound around the chain wheel 14. This manual winding operation is shown in FIGS.
Will be explained. When the shutter opening / closing motor 2 is stopped, the lock piece 27 is engaged with the engaging recess 24 and is in a locked state as shown in FIG. At this time, the circular arc surface 38a of the operating piece 38 and the concave portion 2 of the cam surface 23
A gap S is formed between the gap 3b and 3b.

When the chain is pulled in this locked state and a rotational force in the shutter winding direction is applied to the chain wheel 14, this rotational force is transmitted to the armature 15 via the brake shaft 11 and the rotation of the brake disc 16 is restricted. On the other hand, the armature 15 relatively rotates in the shutter winding direction against the elastic force of the return compression coil spring 22. At this time, as shown in FIG. 5A, the projection 23a of the cam surface 23 is pressed against the operating piece 38, and the operating piece 38 moves outward in the radial direction together with the connecting member 34 supporting the operating piece 38.

Since the lock piece 27 is coupled to the connecting member 34, the lock piece 27 moves to the unlocking side with the movement of the actuating piece 38 and comes out of the engaging recess 24. That is, since the movement amount of the actuating piece 38 that is pushed and moved by the protrusion 23a is longer than the engagement allowance of the lock piece 27 that engages with the engagement recess 24, the armature 15 should be turned. Thus, the brake disc 16 is unlocked.

At this time, the connecting pin 18 for connecting the armature 15 and the brake disc 16 to each other is shown in FIG.
As shown in (b), the return compression coil spring 22 on the front side in the rotation direction of the armature 15 is compressed to allow the through hole 19 to move.
To move within the wide portion of.

When the chain is further pulled, the armature 1
The rotation angle of No. 5 increases, and as shown in FIG. 6A, the operating piece 38 comes into contact with the apex of the protrusion 23a. In this case, the connecting pin 18 comes into contact with the restricting surface 19a of the through hole 19, and the rotational force for rotating the armature 15 is transmitted to the brake disc 16 via the connecting pin 18, so that the brake disc 16 and the armature 15 are connected to each other. Rotate together. That is, as shown in FIG. 6B, the through hole 19 moves from the position shown by the chain double-dashed line in the figure to the position shown by the solid line. At this time, the lock piece 2
A part of the tip surface of 7 is the outer peripheral surface 24 of the brake disc 16.
It comes to face b with a space in the radial direction.

When the armature 15 and the brake disc 16 further rotate and the arcuate surface 38a of the operating piece 38 exceeds the apex of the protrusion 23a, the arcuate surface 38a becomes the cam surface 2.
The position engaging with 3 gradually moves inward in the radial direction of the armature 15. Therefore, the operating piece 38 and the lock piece 27 gradually move inward in the radial direction, and the movement is stopped by the lock piece 27 engaging with the outer peripheral surface 24b of the brake disc 16.

After the lock piece 27 is engaged with the outer peripheral surface 24b, the armature 15 and the brake disc 16 are provided.
The rotation of the lock piece 27 causes the lock piece 27 to slide on the outer peripheral surface 24b. Then, when the lock piece 27 is positioned near the end of the outer peripheral surface 24b, as shown in FIG. 7A, the protrusion 23a on the rear side in the rotational direction of the cam surface 23 is newly engaged with the operating piece 38. Come into contact.

That is, after the operating piece 38 has passed over the protrusion 23a indicated by reference numeral A1 in FIG. 6A,
The lock piece 27 slides on the outer peripheral surface 24b indicated by the symbol B. Then, as shown in FIG. 7 (a), the lock piece 27 is faster than the lock piece 27 is engaged with the engaging recess 24 from the outer peripheral surface 24b indicated by the reference symbol B, and is more rearward in the rotation direction than the protrusion 23a indicated by the reference symbol A1. The protrusion 23a (shown by reference numeral A2) of the operating piece 3
Contact 8

As described above, by continuously pulling the chain, the state where the operating piece 38 slides on the cam surface 23 of the armature 15 and the state where the lock piece 27 slides on the outer peripheral surface 24b of the brake disc 16 are alternately repeated. Accordingly, the armature 15, the brake disc 16, and the brake wheel 7 rotate without the lock piece 27 engaging with the engaging recess 24. As a result, the rotary shaft 5 is rotated in the shutter winding direction by manual operation, and the shutter is wound and opened.

When the shutter winding operation is completed or when the user pulls the chain when the winding operation is stopped midway, the pawl member 26 of the ratchet mechanism 25 engages with the engaging recess 24 of the brake disc 16. Therefore, even if you release your hand from the chain during manual winding, the brake disc 1
Since 6 is rapidly locked, the shutter never closes.

When the pulling of the chain is stopped in this way,
The armature 15 to which no rotational force is applied from the chain wheel 14 is returned to the neutral position by the elastic force of the return compression coil spring 22. As a result, the lock piece 27
Engage with the engaging recess 24 of the brake disc 16, and the rotation of the brake disc 16 is also restricted by the lock piece 27. That is, the armature 15, the brake disc 16, the lock piece 27, and the actuating piece 38 return from the state shown in FIG. 7 to the state shown in FIG. 2 or 4 and enter the locked state.

Therefore, according to the above-described braking device 1, when the armature 15 is manually rotated with respect to the brake disc 16, the operating piece 38 and the locking piece 27 are integrally moved to the outside in the radial direction and the brake is applied. The disk 16 is unlocked. Therefore, the actuating piece 38 driven by the armature 15 moves from the actuating piece 38 to the lock piece 2
When transmitting the operating force to 7, the operating force transmitting system can be performed without interposing a member that moves relatively to the both members.

Further, the return compression coil spring 22 for giving the return habit to the armature 15 is provided with the brake disc 16.
Can be accommodated in the through hole 19, and the rotation angle of the armature 15 that rotates relative to the brake disc 16 can be set by the opening shape of the through hole 19. Therefore, even if the armature 15 and the brake disc 16 are formed of flat plates, a mechanism for moving the lock piece 27 to the unlocking side and a mechanism for rotating the brake disc 16 in the unlocked state can be incorporated.

The actuating piece to be brought into contact with the cam surface of the armature of the second embodiment is shown in FIG.
It can also be formed as shown in FIG. 8A and 8B are views showing another embodiment of the operating piece, FIG. 8A is a front view, and FIG. 8B is a view on arrow B in FIG. 8A. In these figures, members that are the same as or equivalent to those described with reference to FIGS. 1 to 7 are given the same reference numerals and detailed description thereof is omitted.

In FIGS. 8 (a) and 8 (b), reference numeral 41 is an operating piece according to this embodiment. The operating piece 41 is formed in a disc shape, and has a support rod 34c of the connecting member 34 at the axial center thereof.
Is pierced and is rotatably supported by this. Also,
In the lock piece 27 shown in this example, a protrusion 42 is formed on the end of the connecting member 34 on the plate-shaped portion 34a side, and the protrusion 42 is formed.
Is inserted into the through hole 43 of the plate portion 34a. The holes 44 formed in the plate-shaped portion 34a at two positions are for inserting the guide rods 33.

By adopting such a form, the armature 1
When the armature 15 is rotated with the operating piece 41 attached to the cam surface 23 of No. 5, the operating piece 41 rolls on the cam surface. Therefore, compared with the case of adopting the first embodiment in which the operating piece 41 slides on the cam surface 23, the sliding resistance becomes smaller, and the force required for manual winding may be relatively small. In addition, there is an advantage that durability of the armature 15 and the operating piece 41 is also improved.

The support structure of the brake shaft according to the third embodiment can be constructed as shown in FIG. FIG. 9 is a vertical cross-sectional view of a braking device for an electric shutter opening / closing machine according to a third aspect of the present invention.
The same or equivalent members as those shown in (4) are designated by the same reference numerals, and detailed description thereof will be omitted.

In the armature 15 shown in FIG. 9, the shaft center portion is connected to the brake shaft 11, and the armature 15 is provided near the outer peripheral edge.
Rollers 45 are provided on the outer peripheral surface of the field core 10 formed in an annular shape. The roller 45 is rotatably attached to a support rod 46 standing on the armature 15 in parallel with the axial direction. Further, the support rods 46 are arranged at three positions at equal intervals in the circumferential direction of the armature 15.

With this structure, the armature 15
Are rotatably and axially slidably supported by the field core 10 via the rollers 45. Therefore, by connecting the brake shaft 11 of the electromagnetic brake 3 to the armature 15, the brake shaft 11 can be rotatably and axially movably supported by the field core 10 via the armature 15 and the rollers 45.

Therefore, when supporting the armature side end portion of the brake shaft 11, it is not necessary to dispose the bearing member in the hollow portion on the axial center side of the field core 10. In this embodiment, in order to prevent the braking compression coil spring 13 from being rubbed against the end surface of the armature 15, a sheet-shaped spring receiving member is interposed therebetween.

When the third embodiment is adopted, the compression coil spring for braking 13 need not be arranged at the axial center of the field core 10. That is, the field core 10
A plurality of recesses are formed at intervals in the circumferential direction on the end face of the armature 1 facing the armature 15, and compression coil springs are incorporated in these recesses, respectively.
A configuration of energizing 5 is conceivable.

[0086]

In the braking device for the electric shutter opening and closing device according to the first aspect of the present invention, the armature of the non-excitation actuated electromagnetic brake is adjacent to the brake disc frictionally engaged with the brake wheel of the drive shaft for the electric shutter opening and closing device. Are arranged in such a way that they can be rotated relative to each other by a fixed angle, a cam surface consisting of a concave portion and a convex portion is provided on the outer peripheral surface of this armature, and the electromagnetic brake is attached to the fixed member side of the electromagnetic brake by a spring member. Of the lock member, which is urged toward the axial center of the lock member and movably contacts the cam surface from the outside in the radial direction, is movably supported in the radial direction, and is engaged with the engaging recess of the brake disc. When the armature is rotated relative to the brake disc to move the cam surface and the actuating piece by moving the actuating piece, the moving amount of the actuating piece is determined by the lock piece. Since it is configured to be longer than the engagement allowance for the engagement recess, by manually rotating the armature with respect to the brake disc, the operating piece and the locking piece move integrally to the outside in the radial direction to lock the brake disc. Is released.

Therefore, in transmitting the operating force from the actuating piece driven by the armature to the lock piece,
This operation force transmission system can be performed without interposing a member that moves relative to both the members.

For this reason, the structure for moving the lock piece in the manual hoisting mechanism to the unlocking side is simplified as compared with the conventional case where two rocking members are provided. Can be assembled to improve productivity.

A braking device for an electric shutter opening / closing device according to a second aspect of the present invention is the braking device for an electric shutter opening / closing device according to the first aspect of the present invention, in which a plurality of connecting pins provided upright on an armature are inserted into through holes of a brake disc. Then, an axial movement restricting member for a brake disc is attached to the tip of the connecting pin, and the through hole is formed so that the connecting pin is movable in the circumferential direction of the brake disc.
Since the armature and the brake disc are connected by elastically holding the connecting pin in the through hole so as to be located at the central portion in the circumferential direction, the spring member that gives the armature a habit of returning is accommodated in the through hole of the brake disc. The rotation angle of the armature that rotates relative to the brake disc can be set by the opening shape of the through hole.

Therefore, since the brake disc and the armature can be formed in a flat plate shape, respectively,
It is possible to reduce the manufacturing cost because both the unlocking manual rotating body that rotates relative to the brake disc during manual winding and the brake disc have a simple shape.

A braking device for an electric shutter opening / closing device according to a third aspect of the present invention is the braking device for an electric shutter opening / closing device according to the first or second aspect, wherein a field core formed in an annular shape near the outer peripheral edge of the armature. Since the armature is rotatably and slidably supported in the axial direction by the field core through the rollers provided on the outer peripheral surface of the electromagnetic brake, the armature is connected to the brake shaft of the electromagnetic brake. The brake shaft can be rotatably and axially movably supported by the field core via the armature and the rollers.

Therefore, in order to support the armature side end of the brake shaft, it is not necessary to dispose a bearing member in the hollow portion of the field core on the axial center side. Therefore, a braking spring elastically mounted in the hollow portion of the axial center side is not required. Even if the armature is biased by the member in the direction away from the field core, the bearing member having a hardness higher than that of the armature is not rubbed against the armature. For this reason, it is possible to prevent the resistance at the time of manual winding from increasing due to the roughening of the sliding surface, and it is possible to keep the resistance substantially constant even if the manual winding operation is performed more than in the past.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a braking device for an electric shutter opening / closing machine according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a configuration diagram showing a locked state of the manual hoisting mechanism.

FIG. 5 is a configuration diagram showing a state where a lock of a brake disc is released.

FIG. 6 is a configuration diagram showing a state in which the operating piece reaches the top of the cam surface.

FIG. 7 is a configuration diagram showing a state in which the lock piece is in sliding contact with a convex portion between the engaging concave portions.

FIG. 8 is a view showing another embodiment of the operating piece.

FIG. 9 is a vertical sectional view of a braking device for an electric shutter opening / closing machine according to a third invention.

[Explanation of symbols]

1 ... Braking device, 3 ... Electromagnetic brake, 4 ... Manual hoisting mechanism, 7 ... Brake wheel, 8 ... Case, 9 ... Electromagnetic coil, 10 ... Field core, 11 ... Brake shaft, 13 ...
Brake compression coil spring, 15 ... Armature, 16 ... Brake disc, 18 ... Connecting pin, 19 ... Through hole, 22
... Return compression coil spring, 23 ... Cam surface, 24 ... Engagement recess, 27 ... Lock piece, 31 ... Engaging mechanism, 38 ... Actuating piece,
45 ... Roller, 46 ... Support rod.

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E06B 9/74 E06B 9/80 F16D 65/097 F16D 65/22

Claims (3)

(57) [Claims] 1. A brake disc of a non-excitation actuated electromagnetic brake arranged on the same axial line as the drive shaft is pressed against an axial end surface of a brake wheel of a drive shaft for an electric shutter opening / closing device to perform braking. A manual hoisting mechanism having a lock-releasing manual rotary member in which a lock piece that engages with a plurality of engaging recesses formed on the outer peripheral surface of the disc is configured to be rotatable by a fixed angle relative to the brake disc. In a braking device for an electric shutter opening and closing device that is moved to the disengagement side by means of an armature of the non-excitation actuated electromagnetic brake is arranged adjacent to the brake disc and is rotatable by a fixed angle relative to the brake disc. To release the lock by providing a cam surface composed of a concave portion and a convex portion on the outer peripheral surface of the armature. A manual rotary body is constructed by this armature, and the manual hoisting mechanism has an actuating piece, which comes into contact with the cam surface from the outside in the radial direction, supported movably in the radial direction on the fixed member side of the electromagnetic brake, and a spring member. Urges toward the axis of the electromagnetic brake by
An operating piece configured by connecting the lock piece to the operating piece, and moving the cam surface and the operating piece by being pushed by the convex portion when the armature rotates relatively to the brake disc. The braking device for the electric shutter opening / closing device is characterized in that the moving amount of the lock shutter is longer than the engagement margin of the lock piece that engages with the engagement recess of the brake disc. 2. The braking device for an electric shutter opening and closing device according to claim 1, wherein a plurality of connecting pins provided upright on the armature are inserted into through holes of the brake disc, and the brake disc is separated from the armature at the tip of the connecting pin. A restricting member for restricting movement in the direction of rotation, and the through-hole is formed so that the connecting pin is movable in the circumferential direction of the brake disc. The connecting pin in the through-hole is centered in the circumferential direction. A braking device for an electric shutter opening / closing machine, characterized in that an armature and a brake disc are connected by being held so as to be positioned in a section. 3. The braking device for an electric shutter opening / closing device according to claim 1, wherein a roller is provided near the outer peripheral edge of the armature, the roller being in contact with the outer peripheral surface of the annular field core. A braking device for an electric shutter opening and closing device.