HK1028091A - Electrically-driven closure apparatus for building - Google Patents

Description

Electric opening and closing device for building

The present invention relates to an electric opening/closing device for a building, such as an electric rolling door for a building.

In general, in an electric opening/closing device for a building, an opening/closing body is opened/closed by a driving force of an opening/closing machine including an electric motor. In the electric opening/closing device, since an obstacle may be caught during the closing operation, it is preferable to provide an obstacle detection mechanism for detecting the obstacle and an automatic stop control mechanism for automatically stopping the closing operation of the opening/closing body based on the detection of the obstacle. As the obstacle detection mechanism, a direct detection type and an indirect detection type are known. The direct detection type detects an obstacle using an obstacle detection sensor such as a seat plate switch provided in an opening/closing body. The indirect detection type detects a motor load variation (torque variation) caused by the pinching of an obstacle. The indirect detection type has an advantage that it is not necessary to provide an obstacle detection sensor on the opening/closing body, and the obstacle detection mechanism can be used as the limit detection mechanism. In the conventional indirect detection type, there is a mechanism for detecting load fluctuation from a change in rotation speed (or a change in rotation speed) or a change in current value (or a change in voltage value), but in a general electric switchgear for a building, in order to obtain a stable opening/closing speed, an electric motor is driven in a rotation region where a change in rotation speed due to load fluctuation is small, and therefore, there is a problem that the change in rotation speed is small due to the pinching of an obstacle. On the other hand, since the current value also changes due to factors other than load fluctuation, it is relatively difficult to detect an obstacle with high accuracy in terms of detection sensitivity and operation stability.

The electric motor body or the opening/closing device is used as a displacement member which is displaced along with the load variation, the displacement member is held by a load detection spring (a holding neutral spring) so as to be kept in a neutral state relative to a fixed member fixed on the side of the driving body under a predetermined load, and the displacement of the displacement member against the load detection spring is detected by a displacement sensor. It is desirable to perform opening and closing operations with good stability and to detect obstacles with high accuracy.

The conventional load detection spring is bent into a shape of about コ, one end of the spring is supported by a displacement member, the other end of the spring is supported by a fixed member, and when the displacement member is displaced against a spring constant between both ends, the displacement is detected by a displacement sensor. The load detection spring can change the spring constant by changing the effective length, and thus the obstacle detection accuracy can be adjusted. However, in the conventional load detection spring, a slidable adjustment tool is attached to a parallel portion of springs bent in an approximately コ -shape, and the spring constant is adjusted by making the spring from its set position to the bent portion side ineffective. In this way, the load detection spring has to have a predetermined spring constant, and the length required for arranging the adjuster must be added to the effective length thereof, and the adjuster must be increased in size so as to be fixed to the parallel portion without causing deflection, and therefore, the spring itself is increased in size, which is a problem to be solved by the present invention.

The present invention has been made in view of the above problems, and an object thereof is to provide an electric opening/closing device for a building. The electric opening/closing device for building according to the present invention is characterized in that the electric motor body or the opening/closing device is used as a displacement member which is displaced with respect to a fixed member fixed to the body side in accordance with load fluctuation, a load detection spring is interposed between the displacement member and the fixed member, a displacement amount by which the displacement member is displaced against the load detection spring is detected by a displacement sensor, and the load detection spring is fixed so as to adjust a spring constant thereof.

That is, since the displacement amount of the displacement member is substantially proportional to the motor load (torque reaction force), the motor load can be directly detected by the displacement sensor, and as a result, the detection can be performed with high accuracy as compared with the conventional technique in which the motor load is indirectly detected based on the change in the rotation speed and the change in the current value, and further, the obstacle detection (including the limit detection) can be reliably performed with high accuracy by adjusting the spring constant, and the fixing tool of the load detection spring also serves as the adjusting tool of the spring constant, so that the number of parts can be reduced, and the structure can be simplified.

In the present invention, the load detection spring may be formed in a substantially コ -shape or a linear shape.

In the present invention, the displacement member is rotationally displaced about the motor shaft core as a fulcrum, and at least one of the displacement members is detected by the displacement sensor as a rotational displacement amount corresponding to a load variation.

In the present invention, the displacement member is rotatably supported by the fixed shaft and is rotatably displaceable about the fixed shaft axis as a fulcrum, and a rotational displacement amount of at least one of the displacement members in response to a load variation is detected by the displacement sensor.

Fig. 1 is an exploded perspective view of an electric rolling door for a building.

Fig. 2 is a perspective view of the winding bobbin.

FIGS. 3(A) and (B) are schematic side and front views, respectively.

Fig. 4 is a front view showing a shutter support structure.

Fig. 5 is a rear view showing a shutter support structure.

Fig. 6 is a sectional view taken along line a-a of fig. 5.

Fig. 7 is a right side view of fig. 5.

Fig. 8 is a sectional view taken along line B-B of fig. 5.

Fig. 9 is a cross-sectional view taken along line C-C of fig. 5.

Fig. 10 is a cross-sectional view taken along line D-D of fig. 5.

Fig. 11 is a left side view of fig. 5.

Fig. 12 is a plan view of the limit switch portion.

FIGS. 13(A), (B) and (C) are respectively a front view, a right side view and a sectional view taken along line A-A of FIG. 12.

Fig. 14(a) and (B) are a front view and a right side view, respectively, showing embodiment 2.

FIGS. 15(A), (B) and (C) are a front view, a right side view and a cross-sectional view taken along line A-A in FIG. 15(A), respectively, showing the third embodiment of FIG. 3.

FIGS. 16(A), (B) and (C) are a front view, a right side view and a cross-sectional view taken along line A-A in FIG. 16(A), respectively, showing the 4 th embodiment.

FIGS. 17(A), (B) and (C) are a front view, a right side view and a cross-sectional view taken along line A-A in FIG. 17(A), respectively, showing the 5 th embodiment.

Fig. 18(a) and (B) are a front view and a right side view, respectively, showing embodiment 6.

Fig. 19 is a side view showing the switch of embodiment 7.

Next, embodiment 1 of the present invention will be described with reference to fig. 1 to 13.

In the drawing, reference numeral 1 denotes an opening/closing curtain of an electric rolling door for a building, and the opening/closing curtain 1 can be raised and lowered to an open position and a closed position. In the open position, the opening is opened by being wound around the winding bobbin 2. In the closed position, the sheet is unwound from the winding bobbin 2 to close the opening. These basic configurations are the same as in the prior art. Reference numeral 3 denotes guide rails erected on both left and right sides of the opening portion, for guiding both left and right side edges of the opening/closing curtain 1.

The winding drum 2 is composed of a fixed shaft 5, a plurality of winding wheels 6, an internally toothed ring gear 7, and a pair of rods 8. The fixed shaft 5 is disposed between a pair of left and right brackets 4, and the pair of brackets 4 are disposed above the structure. The winding wheel 6 and the internally toothed ring gear 7 are rotatably arranged on the fixed shaft 5. A pair of rods 8 are integrally connected between the winding wheel 6 and the internally toothed ring gear 7. In the present embodiment, the internally toothed ring gear 7 is disposed at one end of the fixed shaft 5. A shutter 9 is attached to one end of the fixed shaft 5, and the shutter 9 is provided with a cylindrical built-in electric motor. The shutter 9 has an extension output shaft (motor shaft) 9b extending from one end of the cylindrical housing 9a, and an output gear (pinion) 10 is integrally provided at the tip end of the extension output shaft 9b, and the output gear 10 meshes with the internally toothed ring gear 7 to transmit the driving force of the shutter 9 to the winding drum 2. Between the fixed shaft 5 and the take-up wheel 6, a balance spring 11 and an impact absorbing spring 11a are elastically attached, so that the opening and closing operation of the opening and closing curtain 1 is performed in a state where the difference between the load of the opening and closing curtain 1, which varies depending on the opening and closing position, and the accumulated force of the balance spring 11 is supplemented by the driving force of the opening and closing machine 9.

The output gear 10 and the internally toothed ring gear 7 transmit power via a clutch mechanism 10a, and the clutch mechanism 10a is constituted by an operating member 10b and an elastic member 10 c. The actuating member 10b moves the output gear 10 disposed on the extension output shaft 9b in the axial direction. The elastic member 10c meshes the output gear 10 with the internally toothed ring gear 7. When the output gear 10 is retracted against the elastic force of the elastic member 10c, the power transmission between the output gear 10 and the internally toothed ring gear 7 can be interrupted.

12. Reference numeral 13 denotes 1 st and 2 nd holders 12 and 13 integrally attached to both ends of the casing 9a of the shutter 9 in the axial direction, and these 1 st and 2 nd holders 12 and 13 are integrally connected by a rod 14. The extension output shaft 9b is rotatably extended from the 1 st holder 12, and the rear extension shaft (motor shaft) 9c is rotatably extended from the 2 nd holder 13. 15. Reference numeral 16 denotes a 1 st and a 2 nd brackets, and bearing portions 15a and 16a and fixed shaft attachment portions 15b and 16b are integrally formed on the 1 st and the 2 nd brackets 15 and 16. The extended output shaft 9b and the rear protruding shaft 9c are rotatably supported by the bearing portions 15a and 16a, respectively, and both ends of the fixed shaft 5 are fixed to the fixed shaft mounting portions 15b and 16b, respectively. Thus, the opening/closing device 9 (the 1 st and 2 nd holders 12 and 13) is supported by the 1 st and 2 nd brackets 15 and 16 (the fixed shaft 5) so as to be rotatable and displaceable about the motor shaft axis as a fulcrum.

Reference numeral 12a denotes a pair of stopper pieces provided on the 1 st holder 12, and the stopper pieces 12a are brought into contact with the stationary shaft 5 to restrict the rotation when the 1 st holder 12 rotates largely together with the shutter 9 (for example, ± 12 °), thereby determining the allowable rotation range of the shutter 9.

Reference numeral 17 denotes a guide plate integrally mounted on the 1 st bracket 15 and rotatably fitted into the internally toothed ring gear 7. Reference numeral 17a denotes a guide roller which is rotatably fitted in the guide groove 7a of the internal ring gear 7.

A load detection spring 18, which will be described later, is interposed between the 1 st holder 12 on the rotation side and the 1 st bracket 15 on the fixed side. The load detection spring 18 holds the pivotally displaceable switch 9 (the 1 st holder 12) at a position substantially midway (± 0 °) within the above-mentioned rotation allowable range in the non-operating state of the switch 9 with the spring force being 0 (neutral holding), and generates a predetermined spring force as the switch 9 is displaced in the forward and reverse directions from the neutral state.

That is, the 1 st holder 12 is formed with a projecting piece 12b, and a spring through hole 12c is formed in the projecting piece. The 1 st bracket 15 has a support edge 15c for mounting a control panel 19, which will be described later, formed on one side thereof with the fixed shaft mounting portion 15b interposed therebetween, and a pair of projecting pieces 15d formed on the other side thereof with a gap in the axial direction, and through holes 15e for springs are formed in the projecting pieces 15d, respectively. The load detection spring 18 has spring forces (spring constants) corresponding to the respective fixed positions, and is slidably inserted through the respective spring through-holes 12c and 15e formed in the 1 st holder 12 and the 1 st bracket 15 at respective ends of the substantially コ -shaped (U-shaped) spring 18 and fixed by the spring fixing tool 20 at the appropriate slide positions.

The spring holder 20 is composed of a fixing metal fitting 20a shaped like a letter コ, a wing bolt 20b, and a nut 20 c. The fixing metal fitting 20a is provided between the pair of projecting pieces 15d of the 1 st bracket 15, and the end of the load detection spring 18 penetrates both leg pieces thereof in a movable fit and is slidably fitted between the projecting pieces 15 d. The wing bolt 20b penetrates the fixing metal fitting 20a, and the tip thereof is connected to and disconnected from the load detection spring 18 penetrating the fixing metal fitting 20a so as to be able to advance and retreat. The nut 20c is screwed to the butterfly bolt 20b, and is disposed in a rotation-stop state by both leg pieces of the fixing metal fitting 20 a. When the wing bolt 20b is rotated with respect to the nut 20c, the front end of the wing bolt 20b is brought into contact with or separated from the load detection spring 18, whereby the movement restriction (fixed attachment) and the release restriction of the load detection spring 18 can be set.

The spring 18 for load detection has a spring constant that can be changed by changing the effective length by changing the fixing position, and the fixing position of the spring 18 for load detection is appropriately adjusted according to the load of the opening/closing curtain 1. In this case, the butterfly bolt 20b can be tightened or loosened to be fixed or released, and the operation portion of the butterfly bolt 20b can be moved on the outer periphery of the protruding piece 15d, so that the operation direction of the butterfly bolt 20d can be selected, and the adjustment operation can be easily performed.

When a torque reaction force corresponding to the motor load acts on the shutter 9 held in the neutral state, the shutter 9 is rotationally displaced against the load detection spring 18 by an amount corresponding to the motor load. That is, when the opening/closing curtain 1 is caught by an obstacle or reaches the fully closed limit position (ground contact position), the balance between the load of the opening/closing curtain 1 and the accumulated force of the spring 11 is lost, and therefore, the opening/closing device 9 is largely rotationally displaced in a predetermined direction (for example, +6 ° or more) against the load detection spring 18, and when the opening/closing curtain 1 reaches the fully open limit position (draw-out opening engagement position), the tensile load of the opening/closing curtain 1 engaged with the draw-out opening is applied, and therefore, the opening/closing device 9 is largely rotationally displaced in the other direction (for example, -6 ° or more).

Further, since the maximum allowable stress of the load detection spring 18 of the present embodiment is set to be larger than the stress to be applied when the displacement amount of the shutter 9 is the maximum, the stress to be applied to the load detection spring 18 is always limited to the maximum allowable stress or less, and the load detection spring 18 can be prevented from being broken.

The control panel 19 is mounted on a control panel holder 21, and the control panel holder 21 is mounted in a state where the support side 15c of the 1 st rack 15 and the 2 nd rack 16 are connected to each other. The control panel 19 is provided with a shutter control circuit 19a and limit switches LSD and LSU connected to the shutter control circuit 19a for detecting rotational displacement of the shutter 9. The limit switches LSD and LSU are connected to the shutter 9 as follows.

That is, a fixed switch bracket 22 is provided on the 1 st bracket 15 side of the control panel bracket 21. The fixed switch bracket 22 is provided with a slide switch bracket 23, the switch bracket 23 is slidable in a direction corresponding to the radial direction of the winding drum 2 by a predetermined distance S, and the limit switches LSD and LSU are fixed to the fixed switch bracket in an opposed manner in the radial direction with the predetermined distance S therebetween. The slide switch holder 23 is held in a neutral position in a positioned state by a torsion spring member 24 disposed on the fixed switch holder 22. Reference numeral 25 denotes an operating lever disposed between the respective facing limit switches LSD and LSU, and the operating lever 25 is supported rotatably in the left-right direction by the protruding pieces 22a and 22b of the fixed switch bracket 22, and has an operating portion 25a formed in an intermediate portion thereof, and the operating portion 25a is brought into contact with and separated from the switch contact of any one of the limit switches LSD and LSU in accordance with the swing of the operating lever 25. The end of the actuating rod 25 protruding from the protruding piece 22a is integrally connected to the upper end of the link 25 b.

In the 1 st holder 12, an arm mounting side 12d is formed to protrude from a portion adjacent to the link 25b in the radial direction, and one end of an actuator arm 26 shaped like a letter コ is rotatably engaged in an engagement hole in the arm mounting side 12 d. The other end of the actuating arm 26 is rotatably engaged in an engagement hole in the lower end portion of the link 25b, so that when the switch 9 is rotationally displaced, the actuating arm 26 swings the lower end portion of the link 25b to swing the actuating rod 25, and the corresponding limit switch LSD or LSU is detected to stop the driving of the switch 9.

The swing (detection) stroke of the actuating arm 26 for detecting the limit switch LSD or LSU is set to be larger than the swing stroke generated in the opening/closing operation without a special overload (in the normal opening/closing operation without an obstacle) and smaller than the swing stroke generated in the overload. In this way, it is possible to detect the intrusion, the full-closing, the full-opening, and the like of the obstacle, which causes the overload. In this normal use state, the rotational force generated by the swing of the actuating lever 25 is lower than the elastic force of the torsion elastic member 24 (the torsion elastic member 24 holds the slide switch bracket 22 supporting the limit switches LSD, LSU at the neutral position), and the limit switches LSD, LSU are detected while being held at the neutral position.

When an accident occurs, the actuating lever 25 goes beyond the swing stroke and applies a large rotational force to the limit switches LSD and LSU, even if the detection operation of the limit switches LSD and LSU does not stop the driving of the opening/closing device 9 and an overload larger than the overload is applied. At this time, the force higher than the elastic force of the torsion elastic member 24 acts on the slide switch holder 23 that supports the limit switches LSD and LSU, and the slide switch holder 23 moves relative to the fixed switch holder 22 while resisting the elastic force of the torsion elastic member 24, thereby preventing the above-mentioned large overload and protecting the limit switches LSD and LSU.

The control circuit 19a of the roll door of the present embodiment has the following design. That is, when the open/close curtain 1 is closed by strong wind, the limit switches LSD and LSU for lowering and raising are operated to detect the load applied to the open/close curtain 1, and at this time, the limit switches LSD and LSU are in the detection state, and therefore, the open/close curtain 1 is not operated even when the open/close curtain 1 is fully closed. Therefore, the open/close control circuit 19a is added with a manual operation mode, so that the open/close operation of the open/close curtain can be performed even if the limit switches LSD and LSU are in the detection state. At this time, the STOP operation switch STOP is pressed for 10 seconds to change from the normal operation mode to the manual operation mode. In this manual operation mode, regardless of whether the limit switches LSD and LSU are in the detection state or the non-detection state, the corresponding opening and closing operations are performed while the opening operation switch UP and the closing operation switch DOWN are pressed. The state is changed to the normal operation state by not performing all operations of opening, closing, and stopping for 10 seconds.

When an overload occurs at the time of starting the shutter 9, and when the overload at the time of starting is large, if the overload is not detected as an overload at the time of normal operation, the obstacle detection accuracy is lowered. In such a case, the detection accuracy can be prevented from being lowered by performing control while ignoring the operation of the limit switches LSD and LSU for 1 second, for example, at the time of start-up.

Further, when the operation switch is switched, a discrimination means is provided for discriminating whether the limit switches LSD and LSU are in the detection state or the non-detection state (in the present embodiment, a continuous sound is emitted if the limit switches LSD and LSU are in the detection state, and an intermittent sound is emitted if the limit switches LSD and LSU are in the non-detection state. Therefore, as described above, even if the open/close curtain 1 is not operated by the switch operation of the operation switch, the states of the limit switches LSD and LSU are checked, and if it is determined that the cause of the non-operation is the detection state of the limit switches LSD and LSU, the open/close curtain can be opened and closed by switching to the manual operation mode after the state of the open/close curtain 1 is checked.

When the opening/closing curtain 1 is opened, the lowermost seat plate of the opening/closing curtain 1 is brought into contact with the lintel, and the detection operation of the raising limit switch LSU is performed, thereby stopping the driving of the opening/closing device 9. However, at this time, since a slight time lag occurs before the lifting limit switch LSU detects that the seat plate and the bridge are connected, and the shutter 9 is stopped, the opening and closing curtain 1 is further opened during the time lag, and the seat plate is stopped in a state where a load is applied to the bridge. In this device, after the rising limit switch LSU is switched to the detection state, the shutter 9 is closed (reversed) for a predetermined time period to pull out the shutter 1, and the device is stopped in a state where the seat plate and the bridge are slightly separated.

In the apparatus having the above-described structure, when an overload occurs due to the pinching, full closing, full opening, or the like of an obstacle, the shutter 9 is rotationally displaced against the load detection spring 18, and the displacement is detected by the limit switches LSD and LSU, so that the shutter 9 is automatically stopped. That is, since the opening/closing device 9 is rotated and displaced in accordance with the motor load (torque reaction force) and the motor load is detected based on the displacement amount, the motor load can be directly detected, and as a result, the detection can be performed with higher accuracy than the conventional technique in which the motor load is indirectly detected based on the change in the number of revolutions and the change in the current value, and the obstacle detection and the limit detection accuracy can be improved.

Since the spring constant of the load detection spring 18 can be adjusted, the detection sensitivity can be adjusted mechanically, and the load detection spring 18 can be used in common for various opening/closing bodies having different weights and the like. The adjustment of the spring constant of the load detection spring 18 is performed by: the load detection spring 18 is fixed by loosening the wing bolt 20b of the spring fixing tool 20 provided at the projecting piece 15d portion of the 1 st bracket 15 for fixing the load detection spring 18, sliding the load detection spring 18 to a desired position, and tightening the wing bolt 20 b. Thus, the spring constant is adjusted by the spring holder 20 for fixing the neutral holding spring 18, and there is no need to provide a separate adjusting tool for the load detection spring 18, so that the parts can be shared, the structure can be simplified, and the number of parts can be reduced. Further, unlike the conventional art, the load detection spring is also miniaturized by providing a space for disposing the adjuster in the spring instead of providing the adjuster in a parallel portion of the load detection spring 18.

Further, since the operating position can be changed in the radial direction by adjusting and fixing the knob portion of the wing bolt 20b of the load detection spring 18, the operability is improved and the workability is improved.

In the above-described device, since the shutter 9 can be pivotally displaced about the motor shaft core as a fulcrum, it is not necessary to secure a separate displacement space, and it is possible to implement the device by a simple configuration in which the 1 st and 2 nd holders 15 and 16 are changed.

In the above-described device, when the overload applied to the limit switches LSD and LSU is a large load exceeding the normal load, the limit switches LSD and LSU slip to avoid the large load, and the limit switches LSD and LSU are protected.

Further, since the maximum allowable stress of the load detection spring 18 is set to be larger than the stress applied when the displacement amount of the switch 9 is the maximum while the rotation range of the switch 9 is limited, the stress applied to the load detection spring 18 can be limited to the maximum allowable stress or less, and the damage of the load detection spring 18 can be prevented.

The present invention is not limited to the embodiment 1 described above, and for example, the speed reducer constituting the opening/closing machine 9 may be a displacement member that is displaced in accordance with load variation, and the load variation may be detected based on the displacement amount of the member. Further, the present invention is not limited to the opening and closing device for an electric opening and closing curtain as in embodiment 1, and can be applied to a roll-up opening and closing device such as a sunshade.

The following describes embodiment 2 of the present invention with reference to fig. 14. The same reference numerals are given to the same members as those in embodiment 1, and the detailed description thereof will be omitted.

In this embodiment, bearing portions 27a, 28a are formed in the 1 st and 2 nd brackets 27, 28 fixedly supported on the fixed shaft 5, and an extended output shaft 9b extended from the shutter 9 and a rear protruding shaft 9c are supported on the bearing portions 27a, 28a, respectively, so that the shutter 9 can be pivotally displaced about the motor shaft core as a fulcrum. Reference numeral 29 denotes a load detection spring made of a linear spring steel material, a case 29a is integrally fitted to the base end of the load detection spring 29, the case 29a is inserted into a spring mounting hole 28b provided in the second bracket 28 and is slidable in the axial direction, and the case 29a is fastened by the tip end of a screw pin 28c screwed into the spring mounting hole 28 b. The front end of the load detection spring 29 is engaged with an engagement portion 9d so as to be movable in the axial direction but immovable in the axial circumferential direction, and the engagement portion 9d is provided on the outer peripheral surface of the casing 9a of the shutter 9 so as to protrude toward the outer diameter side. In this way, the load detection spring 29 acts (is effective) as a spring between the joint portion 9d and the base end side housing tube 29a mounting portion, and neutral holding of the shutter 9 is performed based on the effective length of the load detection spring 29 by a spring constant (elastic force).

When an overload (rotational load) is applied to the shutter 9, the shutter 9 is rotationally displaced (relatively rotated) against the elastic force of the load detection spring 29, and the rotational displacement is detected by a limit switch (not shown). These configurations are the same as those of the above-described embodiment 1. The adjustment of the effective length of the load detection spring 29 (adjustment of the spring constant) in the present embodiment is performed as follows: the adjustment can be performed by loosening the screw pin 28c of the spring mounting hole 28b of the 2 nd bracket 28, moving the load detection spring 29 itself to a desired position through the spring mounting hole 28b and the engaging portion 9d, and then screwing the screw pin 28 c. In this device, the fixing tool (in this case, the 2 nd bracket 28 side) of the load detection spring 29 also serves as an adjusting tool, so that the structure is simplified and the number of parts is reduced.

Next, embodiment 3 shown in fig. 15 is explained. In this embodiment, bearings 30a and 31a are formed in the 1 st and 2 nd brackets 30 and 31 fixedly supported on the fixed shaft 5, and an extension output shaft 9b extending from the shutter 9 and a rear protruding shaft 9c are supported on the bearings 30a and 31a, respectively. Reference numeral 32 denotes a load detection spring made of a linear spring steel material as in the above-described embodiment 2, and the base end portion of the load detection spring 32 is inserted through a spring mounting hole 31b provided in the 2 nd bracket 31, slidably moved in the axial direction, and screwed and fixed by a screw pin 31 c. Thus, the base end portion of the load detection spring 32 is fixed to the 2 nd bracket 31. The load detection spring 32 is slightly longer than the case 9a of the switch 9, and the tip end portion thereof is fixed to the case 9a by a fixing tool 33, the fixing tool 33 includes a through hole 33a and a slide engaging piece 33b, and the load detection spring 32 is inserted through the through hole 33a so as to be movable in the axial direction. The slide engagement pieces 33b are located on both side portions of the through hole 33 a. The front end of the load detection spring 32 is inserted through the through hole 33a, and the slide engagement piece 33b is slidably attached to a pair of protruding pieces 9e, and the pair of protruding pieces 9e are formed on the outer peripheral surface of the housing 9a to be long in the axial direction. The slide engaging piece 33b is screwed with a stopper screw 33c to restrict the circumferential movement of the load detection spring 32, and in this state, the load detection spring is fixed to the 2 nd bracket 31 and the housing 9 a.

In this device, the effective length (spring constant) of the load detection spring 32 can be adjusted by sliding the holder 33 relative to the housing 9a, and the holder 33 of the load detection spring 32 (in this case, the holder on the housing 9a side) is also used as an adjuster, as in the above-described embodiment 2, thereby simplifying the structure and reducing the number of parts.

In the 4 th embodiment shown in FIG. 16, the device comprises the 1 st and 2 nd brackets 30 and 31 for supporting the fixed shaft 5 and a load detection spring 32, and the base end of the load detection spring 32 is fixed to the 2 nd bracket 31. These configurations are the same as those of the above-described embodiment 3. Reference numeral 34 denotes a pair of engaging tools for engagement located on both circumferential sides of the load detection spring 32, and the engaging tools 34 include engaging pieces 34a and sliding bodies 34b facing the load detection spring 32, and the sliding bodies 34b are fitted into axially long slide grooves 9f (the grooves 9f are formed on both circumferential sides of the portion of the housing 9a facing the load detection spring 32), and the engaging pieces 34a and the sliding bodies 34b are screwed with screws 34c, whereby the engaging tools 34 are fixed at appropriate positions in the axial direction of the housing 9 a. When the housing 9a is rotationally displaced (in the forward direction or the reverse direction) with respect to the 2 nd bracket 31, the load detection spring 32 engages with any of the engaging tools 34, and the rotation thereof is restricted to apply a spring force. In this device, the adapter 34 (on the side of the housing 9 a) also serves as an adjuster for adjusting the spring constant of the load detection spring 32, thereby simplifying the structure and reducing the number of parts.

In addition, in this device, since the positions of the engagement tools 34 can be adjusted, the detection accuracy can be appropriately set in accordance with the opening and closing operation of the opening/closing curtain 1, and the operability is also good.

The detection accuracy for each operation of opening and closing the opening/closing curtain 1 is set to be different, and the following method can be adopted in addition to the change of the spring constant as in the above-described embodiment.

That is, in order to change the detection accuracy, the limit switches LSD and LSU of the control panel 19 may be switched in a state where the rotational displacement amount of the switch 9 is different, and for this purpose, for example, the intervals between the limit switches LSD and LSU and the neutral position actuation lever 25 may be adjusted to be different intervals, and the switching time of the limit switches LSD and LSU may be made different.

In the 5 th embodiment shown in fig. 17, the 1 st and 2 nd brackets 30 and 31 and a linear load detecting spring 35 are provided. The 1 st and 2 nd brackets 30 and 31 are fixed to the fixed shaft 5 and support the extended output shaft 9b and the rear protruding shaft 9c of the shutter 9, respectively. The load detection spring 35 passes through a through hole, not shown, formed in the 1 st and 2 nd brackets 30 and 31. The load detection spring 35 passes through a through hole 36a formed in an engaging tool 36, and the engaging tool 36 is slidably engaged with the housing slide piece 9 e. When the shutter 9 is relatively rotated, the load detection spring 35 acts as a spring force in a state of being engaged with the engagement tool 36. In this device, too, the spring constant is adjusted by sliding the adapter 36 relative to the housing 9 a. The joining tool 36 has the same structure as the fixing tool 33 in embodiment 3.

Reference numeral 35a denotes a slip-off preventing clip for preventing the load detection spring 35 from slipping off the 1 st and 2 nd brackets 30 and 31, so that the load detection spring 35 penetrating the 1 st and 2 nd brackets 30 and 31 in a loosely fitted state does not slip off.

In the 6 th embodiment shown in fig. 18, the shutter 9, which is a displacement member that is displaced in accordance with the load fluctuation, is displaced with the shaft core of the fixed shaft 5 as a fulcrum.

That is, in this device, the fixing portions 37a and 38a of the 1 st and 2 nd motor mounting plates 37 and 38 are fixed to both end surfaces of the shutter 9, the 1 st and 2 nd motor mounting plates 37 and 38 are integrally formed with fixed shaft bearing portions 37b and 38b, and the fixed shaft 5 is rotatably supported by the bearing portions 37b and 38 b. Thus, the shutter 9 is rotated about the axial center of the fixed shaft 5 as a fulcrum. An extension portion 37c is formed on the 1 st motor attachment plate 37, a through hole 37d is formed in the extension portion 37c, and one end portion of a load detection spring 39 shaped like a letter コ is slidably inserted through the through hole 37 d. Reference numeral 40 denotes a fixing bracket fixed to the fixed shaft 5 in a non-rotating manner, and an attachment portion 40a is formed in the fixing bracket 40, and the other end of the load detection spring 39 slidably passes through the attachment portion 40 a. The load detection spring 39 can be fixedly supported or released by tightening or loosening the screw 40 b.

The shutter 9 is rotatable with respect to the fixed shaft 5 as described above, and is linked to the internally toothed ring gear 7 constituting the winding drum 2 through the output gear 10. In this way, the shutter 9 is held at the neutral position and rotates the internally-toothed ring gear 7 in a predetermined direction during the normal opening and closing operation of the opening/closing curtain 1. However, when a large load such as obstacle detection is applied, the shutter 9 is rotationally displaced about the axis of the fixed shaft 5 as a fulcrum against the elastic force of the load detection spring 39 (the output gear 10 is rotationally displaced along the internal gear ring 7, and the rotational displacement direction of the output gear 10 (shutter 9) is rotationally displaced in the direction opposite to the predetermined rotational direction of the internal gear ring 7), and this rotational displacement is detected by a detection sensor, not shown. Reference numeral 41 denotes a sleeve for bearing portions of the 1 st and 2 nd motor mounting plates 37 and 38 of the fixed shaft 5.

Therefore, in embodiment 6, the shutter 9 as the displacement member is rotatable with respect to the fixed shaft 5, and when an overload acts on the shutter 9, the shutter 9 is rotationally displaced with the fixed shaft 5 as a fulcrum, and the drive of the shutter 9 is stopped. In this device, the spring constant of the load detection spring 39 is adjusted as follows: the screw 40b of the bracket mounting portion 40a is loosened, the load detection spring 39 is slid to an appropriate position, and then the screw 40b is tightened. No special regulating tool is needed, the structure is simplified, and the number of parts is reduced.

In the 7 th embodiment shown in fig. 19, one protruding piece 12e of a pair of protruding pieces 12e and 12f formed on the 1 st holder 12 is in contact with the fixed shaft 5 when an overload is not applied to the shutter 9 (the neutral holding state in the 1 st embodiment). The rest of the constitution is the same as that of embodiment 1. In this device, one of the projections 12e is in contact with the fixed shaft 5, and the shutter 9 is allowed to rotate in the direction of the arrow (in this embodiment, the rotational displacement during the closing operation of the shutter 1) while being opposed to the load detection spring 18, but is restricted from rotating in the direction opposite to the arrow (in this embodiment, the rotational displacement during the opening operation of the shutter), and therefore does not rotate during the opening operation. In this device, the driving of the shutter 9 is stopped when fully opened, and the driving can be performed by combining other suitable devices such as opening position detection.

In this device, since the rotation in the opposite arrow direction is restricted in the non-operating state of the shutter 9, the spring force of the load detection spring 18 does not need to be set to 0 in the non-operating state, and the load detection spring 18 can push the shutter in the opposite arrow direction (the state in which the shutter 9 is displaced from the neutral state is maintained), thereby preventing the wobbling of the shutter 9.

Claims (4)

1. An electric opening/closing device for a building, which is characterized in that an opening/closing body for opening/closing an opening of a body is opened/closed by a driving force of an opening/closing device provided with an electric motor, wherein the electric motor body or the opening/closing device is used as a displacement member which is displaced relative to a fixed member fixed to the body in accordance with load fluctuation, a load detection spring is interposed between the displacement member and the fixed member, a displacement amount by which the displacement member is displaced against the load detection spring is detected by a displacement sensor, and the load detection spring is fixed so as to adjust a spring constant thereof.

2. The electric opening/closing device for building as claimed in claim 1, wherein the load detection spring is formed in a substantially コ -shape or a straight line shape.

3. The electric opening/closing apparatus for buildings according to claim 1 or 2, wherein the displacement member is pivotally displaced about a motor shaft core as a fulcrum, and a rotational displacement amount of at least one of the displacement members in response to a load variation is detected by the displacement sensor.

4. The electric opening/closing apparatus for buildings according to claim 1 or 2, wherein the displacement member is rotatably supported by the fixed shaft and is rotatably displaceable about the fixed shaft axis as a fulcrum, and a rotational displacement amount of at least one of the displacement members in accordance with a load variation is detected by the displacement sensor.