HK1028092A - Electrically-driven closure apparatus for building - Google Patents

Description

Electric opening and closing device for building

The invention belongs to the technical field of electric opening and closing devices for buildings, such as electric rolling doors for buildings.

In general, in an electric opening/closing device for building which opens/closes an operation opening/closing body by a driving force of an opening/closing drive machine provided with an electric motor, since there is a possibility that an obstacle is caught in a closing operation, it is desirable to provide an obstacle detecting means for detecting an obstacle and an automatic stop control means for automatically stopping the closing operation of the opening/closing body based on the obstacle detection. As the above-mentioned obstacle detection means, there are known a direct detection type in which an obstacle detection sensor such as a seat switch provided on an opening/closing body detects an obstacle and an indirect detection type in which a load variation (torque change) accompanying the electric motor when the obstacle is caught is detected. However, in general electric opening/closing devices for buildings, in order to obtain a stable opening/closing speed, an electric motor is driven in a rotation region where a change in rotation speed is small, and therefore, there is a problem that a change in rotation speed accompanying the sandwiching of an obstacle is small. On the other hand, there is also a problem that the current value varies due to external conditions other than load variation, and in any case, it is difficult to perform highly accurate obstacle detection from the viewpoint of balance between detection sensitivity and operational stability.

Therefore, it is proposed that the electric motor body or the opening/closing driver is a displacement member which displaces in accordance with a load fluctuation, the displacement member is held by a load detection spring (a neutral holding spring) so as to be maintained in a neutral state with respect to a fixed member fixed on the body side under a predetermined load, and the displacement of the displacement member against the load detection spring is detected by a displacement sensor, whereby not only stable opening/closing operation but also high-precision obstacle detection can be performed.

However, in general, when detecting an obstacle, it is necessary to prevent the obstacle from being caught during a closing operation, and high detection accuracy is required for immediately and urgently stopping the electric motor.

However, the conventional load detection spring is formed by bending a single spring steel material into a substantially コ -shape, and acts with the same spring constant in both the opening and closing operations of the opening/closing body, and as a result, the detection accuracy is the same in both the opening and closing operations. Therefore, there is a problem that, when setting a spring constant that determines detection accuracy, it is necessary to perform setting in consideration of high detection accuracy at the time of the closing operation and low detection accuracy at the time of the opening operation, which is also a problem to be solved by the present invention.

In view of the above circumstances, an object of the present invention is to provide an electric opening/closing device for building which opens and closes an opening/closing body for opening and closing a body opening portion by a forward/reverse driving force of an opening/closing driver including an electric motor, wherein the electric motor body or the opening/closing driver is a displacement member which displaces relative 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 of the displacement member which opposes the load detection spring is detected by a displacement sensor, and springs for forward direction and reverse direction are used as the load detection spring, respectively, which are required to correspond to rotational displacement of the displacement member in the forward/reverse direction.

That is, since the displacement amount of the displacement member is substantially proportional to the motor load (torque reaction force), there is a possibility that the motor load is directly detected by the displacement sensor, and as a result, the load detection with high accuracy can be performed 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 rotational displacement in the forward and reverse directions can be detected by the corresponding load detection springs, and the stable operation can be performed while performing the obstacle detection (including the limit detection) with high accuracy.

In this device, the load detection springs of the present invention may be springs each formed substantially in the shape of コ or straight lines.

In this device, the displacement member of the present invention is capable of performing rotational displacement with the motor shaft center as a fulcrum, and the displacement sensor is capable of detecting the amount of rotational displacement of the displacement member in accordance with load variation.

In this device, the displacement member of the present invention is rotatably supported by the fixed shaft and is rotatably displaced about the axis of the fixed shaft as a fulcrum, and the amount of rotational displacement of the displacement member according to the load variation can be detected by the displacement sensor.

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

Fig. 2 is an oblique view of the winding roller.

Fig. 3(a) and (B) are a schematic side view and a schematic front view, respectively.

Fig. 4 is a front view showing a support mechanism of the opening/closing drive machine.

Fig. 5 is a rear view of the same.

Fig. 6 is a sectional view a-a of fig. 5.

Fig. 7 is a sectional view B-B of fig. 5.

Fig. 8 is a plan view of the limit switch portion.

Fig. 9(a), (B), and (C) are a front view, a right side view, and a sectional view a-a of fig. 8, respectively.

Fig. 10(a) and (B) are a front view and a right side view, respectively, showing the second embodiment.

Fig. 11(a) and (B) are a front view and a right side view, respectively, showing the third embodiment.

Fig. 12(a) and (B) are a front view and a right side view, respectively, showing the fourth embodiment.

Fig. 13(a) and (B) are a front view and a right side view, respectively, showing the fifth embodiment.

Next, a first embodiment of the present invention will be described with reference to fig. 1 to 9.

In the drawings, reference numeral 1 denotes a rolling shutter of an electric rolling shutter door for construction, and the rolling shutter 1 is designed to be lifted and lowered to be converted into an open posture and a closed posture. The opening portion of the roll screen 1 is opened by being wound around a winding drum 2 described later in the open position, and the opening portion is closed by winding the roll screen 1 out of the winding drum 2 in the closed position. Reference numeral 3 denotes guide rails which are provided upright on both left and right side portions of the opening portion and guide both left and right side edge portions of the movable rolling shutter 1.

The winding drum 2 is composed of a fixed shaft 5, a plurality of winding wheels 6, an inner ring gear 7, and a pair of stays 8, the fixed shaft 5 is supported and fixed between a pair of left and right holders 4, the pair of left and right holders 4 is disposed above the main body, the plurality of winding wheels 6 is rotatably disposed on the fixed shaft 5, the pair of stays 8 integrally connects the plurality of winding wheels 6 and the inner ring gear, and the inner ring gear 7 is disposed at one end of the fixed shaft 5 in the present embodiment. An opening/closing driver 9 having a drum built-in electric motor is attached to one end of the fixed shaft 5. On the other hand, an extension output shaft (motor shaft) 9b projects from one end side of a cylindrical case 9a constituting the opening/closing driver 9, and an output gear (pinion) 10 integrally formed with the extension output shaft 9b meshes with the ring gear 7, so that the driving force of the opening/closing driver 9 is transmitted to the rotary winding drum 2, and further, a balance spring 11 and an impact absorbing spring 11a are attached between the fixed shaft 5 and the winding wheel 6, so that the roll screen 1 is designed to be opened and closed in a state where the driving force of the opening/closing driver 9 compensates for a difference between a load of the roll screen 1 at which the opening/closing position is changed and an elastic biasing (urging force) force of the balance spring 11.

Here, the output gear 10 and the ring gear 7 transmit power through a clutch mechanism 10a, the clutch mechanism 10a is constituted by an operating member 10b for axially moving the output gear 10 disposed on the extended output shaft 9b and elastic means 10c for engaging and pressing the output gear 10 with the ring gear 7. The clutch mechanism is designed to disconnect the power transmission of the output gear 10 from the ring gear 7 when the gear 10 is withdrawn against the biasing pressing force of the elastic means 10 c.

12. Reference numeral 13 denotes first and second clamp plates 12 and 13 integrally attached to both axial end portions of the opening/closing drive case 9a, and the first and second clamp plates 12 and 13 are integrally connected by a tie rod 14. The extension output shaft 9b is rotatably projected from the first clamp 12, and the rear projection shaft 9c is rotatably projected from the second clamp 13. On the other hand, reference numerals 15 and 16 denote first and second brackets, bearing portions 15a and 16a and fixed shaft attachment portions 15b and 16b are integrally formed on the first and second brackets 15 and 16, the respective protruding portions of the extension output shaft 9b and the rear protruding shaft 9c are rotatably supported on the respective bearing portions 15a and 16a, and the fixed shaft 5 is fixed to the respective fixed shaft attachment portions 15b and 16 b. Therefore, the opening/closing drive mechanisms (the first and second clamp plates 12 and 13) are supported by the first and second brackets 15 and 16 (the fixed shaft 5) so as to be rotatable about the motor shaft center as a fulcrum.

Here, 12a is a stopper provided on the first clamp plate 12, and the stopper 12a abuts against the fixed shaft 5 to restrict the rotation thereof when the first clamp plate 12 and the opening/closing driver 9 make a large rotation (for example, ± 12 °), and therefore, the allowable range of the rotation of the opening/closing driver 9 is also determined.

Reference numeral 17 denotes a guide plate integrally attached to the first carrier 15 and rotatably fitted into the ring gear 7, and reference numeral 17a denotes a guide roller rotatably fitted into a guide groove 7a formed in the ring gear 7.

First and second load detection springs (forward and reverse springs according to the present invention) 18 and 19, which will be described later, are interposed between the first clamp plate 12 on the rotating side and the first bracket 15 on the fixed side, and the clamp plate 12, which is rotatably supported, is set to hold (or to vertically hold) a state in which the spring constant (spring force) is 0 at a substantially intermediate position (± 0 °) within the above-mentioned rotation allowable range in the non-operating state (non-operating state) of the opening/closing drive machine 9, and the corresponding first and second load detection springs 18 and 19 are set to function with a predetermined spring constant as the opening/closing drive machine 9 is rotationally displaced in any of the forward and reverse directions from the neutral state.

That is, a protruding piece 12b is formed on the first clamp 12, and a pair of first and second spring through holes 12c and 12d are provided on the inner and outer diameters of the protruding piece 12b, respectively. On the other hand, a pair of projecting pieces 15d are formed in the first bracket 15 in the axial direction, a gap is formed between the projecting pieces, and a pair of first and second spring through holes 15e and 15f are provided on the inner and outer diameters of the projecting pieces 15d, respectively. The first and second load detection springs 18 and 19 are formed in a substantially コ -shape, the first load detection spring 18 is slidably inserted into the second spring through-holes 12c and 15e at each end, the second load detection spring 19 is slidably inserted into the second spring through-holes 12d and 15f at each end, and is fixed at an appropriate sliding position by the first and second spring fixing tools 20 and 21, respectively, and the first and second load detection springs 18 and 19 are arranged in parallel in the radial direction in a state having a predetermined spring constant, and the opening/closing drive mechanism 9 is held at a neutral position in this state.

Here, the first and second spring through holes 12c and 12d formed in the first clamp plate 12 are circular arc-shaped long holes concentric with the outer peripheral surface of the opening/closing drive case 9a, and in the neutral holding state, the first load detection spring 18 is coupled to one hole end portion (upper end portion in fig. 6) of the first spring through hole 12c, and the second load detection spring 19 is coupled to the other hole end portion (lower end portion in fig. 6) of the second spring through hole 12 d.

The first and second spring holders 20 and 21 are arranged between the pair of projecting pieces 15d of the first bracket 15 in parallel in the peripheral direction of the projecting pieces 15d, and since the spring holders 20 and 21 have the same configuration, only the first spring holder 20 will be described in detail, and detailed description of the second spring holder 21 will be omitted.

That is, the first spring holder 20 is composed of a fixing metal fitting 20a shaped like an approximate コ, a thumb screw 20b and a nut 20c, the fixing metal fitting 20a shaped like an approximate コ is slidably fitted between the protruding pieces 15d, the end of the first load detection spring 18 is respectively penetrated through both leg pieces in a freely fitted manner, the thumb screw 20b is penetrated through the bottom piece of the fixing metal fitting 20a and is advanced and retreated freely in a manner of being separated from and connected to the first load detection spring 18 having the tip inserted through the fixing metal fitting 20a, the nut 20c is screwed to the thumb screw 20b, the rotation thereof is restrained by both leg pieces of the fixing metal fitting 20a, and when the thumb screw 20b is rotated relative to the nut 20c, the tip of the thumb screw 20b can be brought into tight contact with the first load detection spring 18, whereby the movement of the first load detection spring 18 can be restrained, and the restraint can be released.

The positions of the first and second load detection springs 18 and 19 fixed by the first and second fixtures 20 and 21 act as springs at the bent portions, and the length of the bent portions is adjusted as the effective length of the springs, so that the spring constants of the load detection springs 18 and 19 can be adjusted when the springs are fixed by the corresponding fixtures 20 and 21.

In this mechanism, the load detection springs 18 and 19 are fixed or released by tightening or loosening the wing bolts 20b and 21b, and the operation portions of the wing bolts 20b and 21b are movable on the outer periphery of the protruding piece 15d, so that the wing bolts 20b and 21b can be moved and tightened in the peripheral direction, and there is an advantage that adjustment is easy.

When an overload acts on the neutral opening/closing driver, the opening/closing driver 9 rotates by a resisting torque corresponding to the direction of the overload, that is, when the roller blind 1 is closed and caught by an obstacle or reaches a full-closing limit position (ground contact position), the balance between the load of the roller blind 1 and the accumulated biasing force of the balance spring 11 is lost, and the opening/closing driver rotates in the normal rotation direction (direction of arrow X in fig. 7) by a large rotational displacement (for example, +6 ° or more) against the load detection spring 18. On the other hand, when the roll screen 1 is opened and reaches the full open limit position, the opening/closing driver 9 is rotationally displaced in the reverse rotation direction (arrow Y direction in fig. 7) by a large amount (for example, 6 ° or more) due to a tensile load of the roll screen 1 coupled to the conveyance port.

In this case, at the time of the rotational displacement in the forward rotational direction of the opening/closing driver 9 (the direction of the arrow X in fig. 7, the rotational direction generated at the time of the closing operation of the roll screen 1), the rotational displacement is realized in a state of opposing the first load detection spring 18 coupled to one hole end portion of the first spring through hole 12c (a state of being elastically deformed on the side of expanding the first load detection spring 18), and at this time, the second load detection spring 19 moves into the long hole of the second spring through hole 12d, and the second load detection spring 19 is provided so that the spring force does not act (does not interfere with) during the rotation of the opening/closing driver to that side. On the other hand, at the time of the rotational displacement in the counter-rotational direction of the opening/closing driver (the arrow Y direction in fig. 7, the rotational direction occurring at the time of the opening operation of the roll screen 1), the rotational displacement is performed in a state of opposing the second load detection spring 19 coupled to the hole end portion at the other end of the second spring through-hole 12d (a state of being elastically deformed on the bent side of the second load detection spring 19), the first load detection spring 18 moves into the long hole of the first spring through-hole 12c, and the first load detection spring 18 is provided so that the spring force does not act (does not interfere) when the opening/closing driver is rotated to the side of the opening/closing driver 9. In this way, the overload at each operation of opening and closing the roller shutter 1 is detected by the resisting force corresponding to the spring constant of the first and second load detection springs 18 and 19, respectively, and different detection accuracy is obtained at each operation, and in the present embodiment, the first load detection spring 18 is set to have a high detection accuracy spring constant, and the second load detection spring 19 is set to have a low detection accuracy spring constant.

Further, since the maximum allowable stress of the first and second load detection springs 18 and 19 in the present embodiment is set to be larger than the stress applied when the displacement amount of the opening/closing driver 9 is the maximum, the stress applied to the first and second load detection springs 18 and 19 is normally limited to the maximum allowable stress or less, and thus, the load detection springs 18 and 19 are prevented from being damaged.

Reference numeral 22 denotes a control panel provided in the opening/closing driver 9, the control panel 22 is attached to a control panel bracket 23, the control panel bracket 23 is supported in a state where a support edge 15c formed on the bracket 15 is connected to the second bracket 16, and the control panel 22 is provided on the opposite side of the pinching opening/closing driver 9 opposite to the first and second load detection springs 18 and 19. In the control panel 22, a shutter control circuit 22a and limit switches LSD and LSU connected to the shutter control circuit 22a for detecting the rotational displacement of the opening/closing actuator 9 are installed. The limit switches LSD and LSU and the opening/closing driver 9 are connected as described below.

That is, a fixed switch bracket 24 is provided on the first bracket 15 side of the control panel bracket 23, and a slide switch bracket 25 is provided on the fixed switch bracket 24, the slide switch bracket 25 being slidable in a direction corresponding to the radial direction of the winding drum 2 by a predetermined distance S. Here, the limit switches LSD and LSU are fixed to each other in an opposed manner and have a predetermined distance S in the radial direction₀The slide switch bracket 25 is held in a neutral position by a torsion spring 26 disposed in the fixed switch bracket 24. On the other hand, reference numeral 27 denotes an actuating lever disposed between the limit switches LSD and LSU, and the actuating lever 27 is supported by the projecting pieces 24a and 24b of the fixed switch bracket 24 so as to be rotatable in the left-right direction, and forms an operating portion 27a at an intermediate position thereof, and the operating portion 27a is brought into contact with the switch contact points of the limit switches LSD and LSU in accordance with the swing of the actuating lever 27. The upper end of the link 27b is integrally connected to the end of the actuating rod 27 from which the protruding piece 24a protrudes.

On the other hand, an arm-shaped mounting side 12e is formed on the first clamp plate 12 so as to project from a portion adjacent to the link 27b in the radial direction, and one end of an actuating arm 28 shaped like a letter コ is rotatably coupled to a coupling hole provided in the arm-shaped mounting side 12 e. Since the other end of the actuating arm 28 is rotatably coupled to a coupling hole provided at the lower end of the link 27b, when the opening/closing drive motor 9 is rotationally displaced, the actuating arm 28 pivots the lower end of the link 27b, thereby causing the actuating rod 27 to pivot and performing detection operations of the limit switches LSD and LSU, respectively, thereby stopping the drive of the opening/closing drive motor 9.

Here, since the swing (detection) stroke generated by the limit switch LSD or LSU detection operation of the actuating arm 28 is set to be larger than the swing stroke generated in the opening/closing operation without a particular overload and smaller than the swing stroke generated at the time of overload, it is possible to detect the case where an obstacle, which is a factor of the overload, is caught, fully closed, fully opened, or the like. In a normal use state, the rotational force generated by the swing of the operating lever 27 is lower than the elastic force of the torsion spring 26, the torsion spring 26 holds the slide switch bracket 24 supporting the limit switches LSD and LSU at the neutral position, and the limit switches LSD and LSU are set so as to be held at the neutral position and perform the detection operation.

On the other hand, when an unexpected situation occurs, regardless of whether the limit switch LSD or LSU is detected, the opening/closing driver 9 does not stop driving, and an excessive load larger than the excessive load is added, the actuating rod goes beyond the swing stroke and gives a large turning force to the limit switches LSD and LSU. In this case, since a force greater than the elastic force of the torsion spring 26 acts on the slide switch bracket 25 that supports the limit switches LSD and LSU, and the slide switch bracket 25 slides relative to the fixed switch bracket 24 while opposing the elastic force of the torsion spring 26, the above-described large overload is avoided, and the limit switches are protected.

Note that the following consideration is given to the shutter control circuit 22a of the present embodiment. That is, when the roll screen 1 is closed in strong wind, a load is applied to the roll screen 1, and the limit switches LSD and LSU for lowering and raising are operated to detect the load, and at this time, the limit switches LSD and LSU are in a detection state, and the roll screen 1 does not operate even if it is fully closed. Therefore, a manual operation motor is added to the shutter control circuit 22a so that the shutter 1 can be opened and closed when the limit switches LSD and LSU are in the detection state. In this case, when the STOP operation switch is pressed for 10 seconds, the setting is changed from the normal operation motor to the manual operation motor, and when the manual operation motor is used, the shutter door corresponding to the period during which the open operation switch is pressed UP and the close operation switch is pressed DOWN (DOWN) is set to operate regardless of whether the limit switches LSD and LSU are in the detection state or the non-detection state. Therefore, the motor can be changed from the normal operation state to the normal operation state according to the setting without performing all operations such as opening, closing, and stopping for 10 seconds.

In the case where an overload occurs when the opening/closing driver 9 is started and the overload is large at the time of starting, if the overload is not detected as an overload at the time of normal operation, it is considered that the accuracy of detection of the obstacle is lowered, and in this case, the operation of the limit switches LSD and LSU is controlled so as to be ignored at the time of starting, for example, for 1 second, and thus the accuracy of detection can be prevented from being lowered.

When the operation switch is switched, a recognition means for recognizing whether the limit switches LSD and LSU are in the detection state or the non-detection state is provided. (in this embodiment, it is set so that a continuous sound is generated if the detection state is true, and an intermittent sound is generated if the non-detection state is false, and the sound may be indicated by a bulb or by another identification means). Therefore, when the operation switch is switched to the on/off operation and the roller shutter 1 is not operated, the detection states of the limit switches LSD and LSU are confirmed, and after the state of the roller shutter 1 is confirmed, the roller shutter 1 can be switched to the manual operation motor to open and close the roller shutter 1.

When the curtain 1 is opened and the seat plate at the lowermost end of the curtain 1 comes into contact with the door beam, the opening/closing drive machine 9 is stopped by the detection operation of the rising limit switch LSU, and at this time, there is a short time lag from the contact between the seat plate and the door beam to the time when the rising limit switch LSU detects the contact and stops the opening/closing drive machine 9, and the curtain 1 is opened again during the time lag, so that the seat plate is stopped in a state where a load is applied to the door beam. In this process, after the rising limit switch LSD is switched to the detection state, the closing drive machine 9 is closed (reversed) for a predetermined time, the roll screen 1 is conveyed, and the conveyance is stopped in a state where the distance between the seat plate and the door beam is controlled to be small.

In the present embodiment configured as described above, when an overload occurs due to an obstacle being caught or the roller shutter 1 being fully closed or fully opened, the opening/closing driver 9 rotates against the corresponding first and second load detection springs 18 and 19, and the rotational displacement is detected by the limit switches LSD and LSU, so that the opening/closing driver 9 is automatically stopped. That is, since the opening/closing driver 9 is rotationally displaced in accordance with the motor load (torque force) and the motor load is detected from the displacement amount, there is a possibility that the motor load is directly detected, and as a result, the load detection can be performed with higher accuracy than the case where the motor load is indirectly detected from the change in the rotation speed and the current value, and the accuracy of the obstacle detection and the limit detection can be improved.

In the present embodiment, the rotational displacement of the opening/closing drive mechanism 9 during the closing operation and the opening operation is a result of the first and second load detection springs 18 and 19 resisting the mutual noninterference, and the spring constants of the first and second load detection springs 18 and 19 are individually adjusted, whereby different detection accuracies can be obtained during the operation of the roller shutter 1. Therefore, the high detection precision is achieved during the locking action, the obstacles can be clamped less, the detection precision is reduced during the opening action, the action stability is good, and the operation performance of the action is good.

Since the spring constants of the first and second load detection springs 18 and 19 can be individually adjusted, the first and second load detection springs 18 and 19 can be used in common for various opening/closing bodies having different weights, as well as for the adjustment of the detection sensitivity mechanically and appropriately. The adjustment of the spring constant of the first and second load detection springs 18 and 19 is a result of appropriately sliding the respective load detection springs 18 and 19, and the first and second fixtures 20 and 21 for fixing the first and second neutral holding springs 18 and 19 also serve as adjustment tools for the first and second load detection springs 18 and 19, thereby simplifying the structure and reducing the number of parts.

Further, the first and second load detection springs 18 and 19 are configured to act on the forward and reverse rotational displacements of the opening/closing drive machine 9, respectively, and do not interfere with each other, so that there is an advantage in that the sensitivity of the first and second load detection springs 18 and 19 can be easily adjusted. That is, in the structure, when the springs interfere with each other, for example, when the springs are displaced in the forward direction and the two load detection springs interact with each other, the change in the detection sensitivity to the change amount of the spring constant (the sensitivity in which the spring constants are combined) becomes large, and there is a problem that the adjustment is difficult, but this problem is not present in the present embodiment.

Further, since the knob positions of the wing bolts 20b and 21b for adjusting and fixing the load detection springs 18 and 19 can be changed to the radial direction of the protruding piece 15d, the operability can be improved and the workability can be improved.

In the present embodiment, since the opening/closing driver 9 is rotatably supported about the motor shaft center as a fulcrum, there is no need to specially secure a displacement space, and the present embodiment is advantageous in that it can be implemented by changing the simple configuration of the first and second brackets 15 and 16.

When an overload applied to the limit switches LSD and LSU becomes a large load exceeding a normal load, the limit switches LSD and LSU must slide to protect the limit switches LSD and LSU from the large load. Further, since the maximum allowable stress of each of the load detection springs 18 and 19 is set to be larger than the stress applied when the displacement amount of the opening/closing drive mechanism 9 is the maximum during the opening/closing operation, while limiting the rotation range of the opening/closing drive mechanism 9, it is expected that the stress applied to each of the load detection springs 18 and 19 can be limited to the normal maximum allowable stress or less to prevent breakage.

Needless to say, the present invention is not limited to the first embodiment described above, and for example, the speed reducer constituting the opening/closing driver 9 may be a displacement member that displaces in accordance with a load fluctuation, and the load fluctuation may be detected based on the displacement amount of the member. The present invention is not limited to the opening and closing device of the electric rolling door as in the first embodiment, and a rolling type opening and closing drive device such as a curtain may be used.

Next, a second embodiment of the present invention will be described with reference to fig. 10, in which the same objects (the same objects) as those of the first embodiment are drawn with the same reference numerals, and the details thereof are omitted.

In this embodiment, the first and second brackets 29 and 30 are fixedly supported on the fixed shaft 5, the first and second brackets 29 and 30 are formed with bearing portions 29a and 30a, and the extended output shaft 9b and the rear protruding shaft 9c extending from the opening/closing driver 9 are respectively supported by the bearing portions 29a and 30a, whereby the opening/closing driver 9 is set to be rotationally displaced with the motor shaft center as a fulcrum. A pair of protruding pieces 30b and 30c are formed on the outer peripheral portion of the second bracket bearing portion 30a so as to protrude in the outer diameter direction, and one end portions of first and second load detection springs 31 and 32, which will be described later, are set to be slidably inserted. Further, a stopper 30d in an axially long protruding shape is provided between the pair of projecting pieces 30b and 30 c.

On the other hand, a support piece 33a is provided on the outer periphery of the case 33 of the opening/closing actuator 9 so as to protrude in the outer radial direction, and a pair of arc-shaped long holes 33b and 33c concentric with the outer periphery of the opening/closing actuator case 33 are formed in the support piece 33 a.

The first and second load detection springs 31 and 32 are zigzag-shaped members formed by elastically deforming the member in a state in which both end portions are opened to each other into a substantially コ -shape, and are inserted into the second bracket protruding pieces 30b and 30c at one end portions thereof as described above, and into the long holes 33b and 33c of the box body supporting piece 33a at the other end portions thereof, and the first and second load detection springs 31 and 32 are attached between the second bracket 30 on the fixed side and the opening/closing driver 9 on the displacement member side. The first and second load detection springs 31 and 32 are fixed by screws 34 and 35 screwed to the second bracket protruding pieces 30b and 30c, the first and second load detection springs 31 and 32 are moved to appropriate sliding positions and fixed by the screws 34 and 35, and the adjustment of the spring constant against the rotational displacement of the opening/closing driver 9 is the same as the first embodiment.

In the attached state, the other end portions of the first and second load detection springs 31 and 32 are arranged in parallel in the circumferential direction in a state of being close to (adjacent to) each other.

The other end portions of the load detection springs 31 and 32 are coupled to the adjacent hole end portions of the elongated holes 33b and 33c by spring forces (opening forces) generated by the elastic deformation, and the other end portions protruding from the elongated holes 33b and 33c are brought into contact with both side portions in the peripheral direction of the stopper 30d formed in the second bracket 30, so that no elastic force acts on the box body 33, and the spring bodies are fixed in a state of sandwiching the stopper 30 d. Therefore, the load detection springs 30 and 31 hold the opening/closing driver 9 at the neutral position (the intermediate position of the rotation allowable range) in a state where the spring constant is not 0, and the opening/closing driver 9 is held in a state where it is not shaken.

When the open/close driving mechanism 9 is overloaded and rotationally displaced in the arrow X direction from the above-described neutral holding state, the first load detection spring 31 exerts a resistance force (a spring force and a force generated by elastic deformation in the bending direction) on the open/close driving mechanism 9 through the elongated hole 33b of the support piece 33a, and the other end portion of the second load detection spring 32, the movement of which is restricted by the stopper piece 30d, is set in a state of moving relative to the support piece elongated hole 33c, and no spring force is exerted on the open/close driving mechanism 9. When the opening/closing driver 9 is rotationally displaced in the direction of arrow Y, the opening/closing driver is displaced in a state of being subjected to the resistance of the second load detection spring 32, and the first and second load detection springs 31 and 32 are adjusted to have a desired spring constant, respectively, so that the detection accuracy can be set individually in each of the opening and closing operations.

In this way, in the second embodiment, different detection accuracies can be set even in the opening and closing operation, and not only can the obstacle detection be performed with high accuracy, but also the opening operation with good stability and the opening operation with good operability can be performed in the opening operation. Further, since the other end portions of the first and second load detection springs 31 and 32 of the second embodiment press the stopper 30d with a predetermined spring force and are separated from the spring-loaded state and become a spring-loaded (resisting) state when the opening/closing driver 9 is rotationally displaced due to an overload, there is an advantage in that the change in the spring force can be reduced due to the relative rotational change, the detection accuracy can be improved, and the instability in the neutral holding state can be prevented, compared with the case where the spring force is 0 in the neutral holding state as in the first and second load detection springs 18 and 19 of the first embodiment.

Next, a third embodiment shown in fig. 11 will be described, in which bearing portions 36a, 37a are formed in first and second brackets 36, 37 fixedly supported on the fixed shaft 5, and an extension output shaft 9b and a rear protruding shaft 9c protruding from the opening/closing driver 9 are respectively journaled in the bearing portions 36a, 37 a. 38. Reference numeral 39 denotes first and second linear load detection springs, base end portions of the load detection springs 38 and 39 are inserted and supported in spring mounting through holes 37b and 37c, respectively, the spring mounting through holes 37b and 37c are formed in the outer peripheral portion of the second bracket bearing portion 37a so as to be adjacent to each other in the peripheral direction, and the other end portions are inserted and supported in spring mounting holes 36b and 36c formed in the outer peripheral portion of the first bracket bearing portion 36a, respectively. The first and second load detection springs 38 and 39 are prevented from being pulled out by the bent portions 38A and 39a at the other ends and the spring pull-out prevention members 38b and 39b at the one ends.

On the other hand, reference numeral 40 denotes a fixture 40, in which first and second load detection springs 38 and 39 are freely fitted to be axially movable, and the fixture 40 is formed with a pair of spring through holes 40a and 40b and a slide coupling piece 40c, the pair of spring through holes 40a and 40b are formed in an arc shape concentric with the outer peripheral surface of the opening/closing drive case 9a, the slide coupling piece 40c is freely fitted to be axially slidable to a projecting piece 9d, and the projecting piece 9d is formed in an axially elongated shape on the outer peripheral surface of the case 9 a. Since the fixing tool 40 is fixed to an appropriate position on the outer peripheral surface of the motor case 9 by the screw 40d, the opening/closing driver 9 is kept in the neutral state in a state where the first and second load detection springs 38 and 39 having predetermined spring constants are attached between the opening/closing driver 9 and the first and second brackets 36 and 37. At this time, the first and second load detection springs 38 and 39 are coupled to the hole ends of the anchor spring through holes 40a and 40b on the sides adjacent to each other.

When the open-close driver 9 is rotationally displaced in the arrow X direction by an overload from the above-described neutral holding state, the open-close driver 9 receives the resistance of the first load detection spring 38 through the hole end of the spring through hole 40a of the fixture 40. The second load detection spring 39 is set to move in the fixture spring through hole 40b and set so as not to apply a spring force to the opening/closing driver 9. When the opening/closing driver 9 is rotationally displaced in the arrow Y direction, the opening/closing driver is displaced while receiving the resistance of the second load detection spring 39. Therefore, the first and second load detection springs 38 and 39 of the third embodiment are set to have different detection accuracies in the opening and closing operations by using different spring constants, and the state is further finely adjusted by using the fixture 40. In the third embodiment, as in the above-described embodiments, the detection accuracy is set to be different between the open and closed states, and thus, not only can the obstacle detection be performed with high detection accuracy, but also the operation with good stability and good operability can be performed during the open operation.

In the present embodiment, the same springs are used for the first and second load detection springs 38 and 39, and even when springs having the same spring constant are used, the detection accuracy may be changed during the opening/closing operation as follows. In this case, if the limit switches LSD and LSU of the control panel 22 can be switched in a different manner in terms of structure, the detection accuracy can be changed, and for example, the interval from the operating lever 27 at the neutral position to each of the limit switches LSD and LSU can be set to be different in terms of structure, and the timing of the switching operation of each of the limit switches LSD and LSU can be different. Needless to say, the first and second load detection springs 38 and 39 may be cantilevered to be supported by either one of the first and second brackets 36 and 37.

In the fourth embodiment shown in fig. 12, the opening/closing driver 9, which is a displacement member that displaces in accordance with load fluctuation, displaces with the axial center of the fixed shaft 5 as a fulcrum.

That is, in this embodiment, the fixed portions 41a and 42a of the first and second motor mounting plates 41 and 42 are fixed to both end surfaces of the opening/closing driver 9, and the fixed shaft bearings 41b and 42b are integrally formed with the first and second motor mounting plates 41 and 42 to rotatably support the fixed shaft 5, so that the opening/closing driver 9 is set to rotate about the axis of the fixed shaft 5 as a fulcrum. An extension 41c is formed on the first motor mounting plate 41, and a pair of arc-shaped spring through holes 41d and 41e concentric with the outer peripheral surface of the fixed shaft 5 are formed in the extension 41 c. One end portions of the first and second load detection springs 43 and 44, which are substantially コ -shaped as in the first embodiment, are slidably inserted into and supported by these spring through holes 41d and 41 e. On the other hand, a fixing bracket 45 is fixed to the fixed shaft 5 so as to prevent rotation, and mounting portions 45a and 45b are formed on the fixing bracket 45, and the mounting portions 45a and 45b are slidably inserted into end portions supporting the first and second load detection springs 43 and 44, so that the load detection springs 43 and 44 can be fixed by tightening or releasing screws 45c and 45 d.

Further, as described above, since the opening/closing driver 9 is rotatably supported by the fixed shaft 5 and is linked to the ring gear 7 constituting the winding drum 2 through the output gear 10, the opening/closing driver 9 rotates the ring gear 7 in a predetermined direction while maintaining a neutral position during the normal opening/closing operation of the roll screen 1, and when a large load acts on the roll screen 1 such as the full-closing operation or the full-opening operation of the obstacle detection, the opening/closing driver 9 is rotationally displaced along the ring gear by opposing the corresponding first and second load detection springs 43 and 44 with the axial center of the fixed shaft 5 as a fulcrum, the output gear 10 is in a state of being rotationally displaced along the ring gear, and the rotational displacement direction of the output gear 10 (the opening/closing driver 9) is set to be opposite to the rotational direction of the predetermined ring gear 7. The rotational displacement is detected by a detection sensor, not shown. That is, in the neutral holding state of the opening/closing driver 9, when the first and second load detection springs 43 and 44 are positioned at the hole edges on the side adjacent to each other of the spring through holes 41d and 41e of the first motor mounting plate 41 and an overload is applied to the opening/closing driver 9 from the neutral state and the first motor mounting plate extension 41c is rotationally displaced in the arrow X direction, the first load detection spring 43 is set to rotate against the spring through hole 41d (the first load detection spring 43 is opened). In this case, when the second load detection spring 44 moves in the spring through hole 41e, the rotation in the direction is not interfered, and the rotational displacement in the arrow Y direction is performed against the second load detection spring 44 without interfering with the first load detection spring 43, which are the same as those in the above-described embodiment.

Further, 46 is a bush provided at a bearing portion of the first and second motor mounting plates 41 and 42 on the fixed shaft 5.

In this way, in the fourth embodiment, the opening/closing driver 9 as a displacement member is made rotatable with respect to the fixed shaft 5, and the driving of the opening/closing driver 9 is stopped by the rotational displacement of the opening/closing driver 9 about the fixed shaft 5 as a fulcrum in accordance with the overload applied to the opening/closing driver 9. In this embodiment, the spring constants of the first and second load detection springs 43 and 44 can be adjusted to make the detection accuracy different between the opening and closing operations. Not only can detect an obstacle with high detection precision, but also can make opening operation with good stability.

In the fifth embodiment shown in fig. 13, the first and second load detection springs 47 and 48 are compression springs (coil springs).

That is, in this embodiment, the first and second brackets 49 and 50 are fixed to the fixed shaft 5, the opening/closing driver 9 is rotatably supported by the first and second brackets 49 and 50 about the motor shaft center as a fulcrum, and the outer peripheral surface of the second bracket 50 is formed with spring support portions 50a and 50b in a state of protruding in the outer radial direction. The first and second load detection springs 47, 48 are constituted by the first and second compression springs 47a, 48a, the bolts 47b, 48b, and the adjusting double nuts 47c, 48c, the bolts 47b, 48b are inserted through the compression springs 47a, 48a, respectively, and inserted into the spring support portions 50a, 50b with insertion tip portions thereof being movable, respectively, and the adjusting double nuts are screwed onto the projecting tip portions of the spring support portions 50a, 50b of the bolts 47b, 48b, the first and second compression springs 47a, 48a are elastically held between the bolt heads 47d, 48d and the spring support portions 50a, 50b, and a resisting force (spring force) acts when the bolt heads 47d, 48d are pressed. On the other hand, contact parts 9e and 9f facing the bolt heads 47d and 48d are fixed to the opening/closing driver 9, and when the opening/closing driver 9 is rotationally displaced in either direction of the arrow X or Y, the corresponding contact parts 9e and 9f are set to contact the bolt heads 47d and 48d and receive the resistance force of the corresponding compression springs 47a and 48 a. In this embodiment, the spring constants of the first and second load detection springs 47 and 48 can be adjusted to desired constants by adjusting the double nuts 47c and 48c, respectively, and even in this case, the detection accuracy in the opening and closing operation can be set to be different from each other.

Claims (4)

1. An electric opening/closing drive device for construction, which opens/closes an opening/closing body that opens/closes a body opening by a forward/reverse drive force of an electric motor opening/closing drive machine, characterized in that, in the electric opening/closing drive device for construction, the electric motor body or the opening/closing drive machine is a displacement member that displaces relative to a fixed member fixed to the body side in accordance with load fluctuation, a load detection spring is attached between the displacement member and the fixed member, a displacement amount of the displacement member that opposes the load detection spring is detected by a displacement sensor, and the load detection spring is a forward/reverse spring that acts in accordance with a forward/reverse rotational displacement to the displacement member.

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

3. An electric opening/closing drive apparatus for building use according to claim 1 or claim 2, wherein the displacement member is rotatably displaced about a shaft center of the motor shaft as a fulcrum, and a rotational displacement amount of the displacement member corresponding to the load variation is detected by the displacement sensor.

4. An electric opening/closing drive device for construction as claimed in claim 1 or claim 2, wherein the displacement member is rotatably supported by the fixed shaft and is rotatably displaced about the axis of the fixed shaft as a fulcrum, and a rotational displacement amount of the displacement member according to the load variation is detected by a displacement sensor.