JPH10188734A - Counter type limit switch in building door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a large operational stroke by providing the first arm for swinging while making interference with an external peripheral cam surface and the second arm for swinging in linkage to the first arm and by placing a limit switch in its operation by swinging motion of the second arm. SOLUTION: Under such a condition that an axial movement of an L-letter arm (equivalent to the first arm) against the third number counter wheel 11 is regulated, the L-letter arm is supported freely swingably. An arm bar (equivalent to the second arm) 18 is supported freely horizontally swingably on the first number counter wheel 9 side and its tip end part is formed in a long size beyond the number counter wheel 11 up to a switch lever 15a tip end part. A dropping downward stroke in a recess formed on the number counting wheel 11 becomes an amplified swinging motion at an L-letter arm engagement part and on account of horizontal swinging motion of the middle part of the arm far 18 forced by the engagement part, the operational stroke at the arm bar 18 tip end part position becomes further amplified large stroke. Thus, there is no change that the operational stroke of the switch lever of the limit switch may be regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a counter-type limit switch in a building door for opening and closing an opening of a building such as a building or a factory.

[0002]

2. Description of the Related Art Generally, when a door body is used to automatically open and close an opening, for example, when the door body is a shutter curtain, detection of the open (fully open) or closed (fully closed) position is performed by detecting the position of the shutter curtain. A counter-type limit switch that is ON-OFF controlled based on the rotation of the largest digit counting wheel among a plurality of counting wheels that rotate in association with the winding and unwinding operations of the take-up shaft. It has been known. In such a case, for example,
As disclosed in Japanese Patent Application Publication No. 47228/47 and Japanese Utility Model Publication No. 3-48819, while a concave cam surface is formed on the outer peripheral surface of the largest digit counting wheel, the switch lever of the limit switch abuts on the outer peripheral surface of the largest digit counting wheel. When the take-up shaft opens and closes the shutter curtain to the fully opened or fully closed position, the switch lever is set to fall into the concave cam surface, and the stroke of the switch lever falling into the concave cam surface is set by the switch lever. The ON / OFF operation of the limit switch is performed as the operation stroke.

[0003]

However, it is necessary to select a limit switch based on the amount of current that actually flows, and the larger the limit switch, the larger the shutter device through which a large amount of current flows. The larger the size of the limit switch, the larger the operation stroke for switching the switch lever. For this reason, when the switch lever interferes with the concave cam surface provided on the outer circumference of the counting wheel of the largest digit and swings as in the related art, there is a problem that the operation stroke of the switch lever is insufficient. Further, since the counter type limit switch has a configuration in which the limit switch lever comes into contact with the counting wheel as described above, the limit switch and the counting wheel are generally handled as one unit. However, in the case of explosion-proof limit switches, there are various types of limit switches.Therefore, there is a problem that it is necessary to prepare a unit according to the shape of each limit switch. In the case where there is a design change, there is also a problem that the design of the counting wheel is correspondingly changed and the whole unit needs to be changed. there were.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a counter limit switch for detecting a door opening / closing position created for the purpose of solving these problems. When the counter-type limit switch is configured to perform ON / OFF switching of the limit switch based on the rotation of the largest digit counting wheel among the plural digits counting wheel rotating in connection with the opening and closing operation of the door body. A first arm that swings by interfering with an outer peripheral cam surface formed on the largest digit counting wheel, and a second arm that swings in conjunction with the swing of the first arm, wherein the second arm The ON / OFF switching of the limit switch is performed by the swing of. By doing so, it is possible to cope with the case where the limit switch is enlarged and the ON-OFF switching operation stroke is large. In this case, the limit switch and the second arm of the present invention are disposed so as to be switched ON / OFF at one side of the counting wheel, and do not interfere with the counting wheel. Thus, even when the design of the limit switch is changed, it can be dealt with without changing the design of the counting wheel.

[0005]

FIG. 1 shows an embodiment of the present invention.
This will be described based on the drawings shown in FIGS. In the drawing,
Reference numeral 1 denotes a shutter curtain of an architectural shutter built to open and close an opening. The shutter curtain 1 is a winding shaft 2 rotatably mounted above the opening.
When the winding shaft 2 rotates forward and backward in response to the driving of the opening / closing device 3, the winding shaft 2 is wound around the winding shaft 2 to open the opening. The configuration is such that the posture is changed to a closed posture in which the opening is unwound and the opening is closed.

Reference numeral 4 denotes a counter type limit switch device. The limit switch device 4 is disposed below the switch 3 to detect a fully open position and a fully closed position of the shutter curtain 1 and a casing 5. Counters U and D for opening and closing, which are provided inside the housing, and limit switches L for opening and closing disposed adjacent to the casing 5
SU, LSD, each counter unit U, D and each limit switch LSU, LSD are turned on / off by limit switches LSU, LSD based on rotation of each counter unit U, D.
And a linking means linked to operate.
Now, the casing 5 has a substantially U shape in a front view,
Of the opposing first and second leg sides 5a and 5b, the first leg side 5
The input shaft 6 is rotatably supported in the state a through which the input shaft 6 passes. A sprocket 6a is provided at an end of the input shaft 6 which protrudes outward from the casing 5, and the sprocket 6a is operatively connected to a drive sprocket 3b provided on an output shaft 3a of the switchgear 3. Axis 6 is
It is set to rotate in connection with forward / reverse drive of the switchgear 3. Reference numeral 6b denotes a drive gear 6b provided at an end of the input shaft 6 projecting inward from the casing 5.

Opening and closing counters U and D
Are supported by the casing first and second leg sides 5a and 5b in a state of being disposed on both sides of the input shaft 6, and each of the support shafts 7 and 8 is connected to the drive gear 6b. The driven gears 7a and 8a which are interlockingly connected are rotatably supported in a state in which movement in the axial direction is restricted, whereby the driven gears 7a and 8a are turned in opposite directions based on the rotation of the input shaft 2. It is set to rotate. Here, the opening and closing counter units U and D, the opening and closing limit switches LSU and LSD, and the respective linking means have the same configuration and operate in the same manner. In the drawings, the same reference numerals will be given, and in the case where the two are distinguished from each other, they will be distinguished by adding an opening letter and an opening letter before each name. .

On the support shaft 7 of the counter section U, in addition to the driven gear 7a, three first counting wheels (minimum digit counting wheels) 9, a second counting wheel 10, and a third counting wheel ( The largest digit counting wheel) 11 is rotatably supported in a state in which movement in the axial direction is restricted. These are driven gear 7a, first counting wheel 9, second counting wheel 10, and third counting wheel 10. The third counting wheel 11 is positioned in the vicinity of the second leg 5b in the order of the counting wheel 11 in the axial direction. And the driven gear 7a and the first, second,
The third counting wheels 9, 10, 11 are the first, second,
The third connection gears 12, 13, and 14 are connected to each other in an interlocked manner, whereby the rotational force of the input shaft 6 is reduced by the driven gear 7
a, first connecting gear 12, first counting wheel 9, second connecting gear 1
3, power is transmitted to the third counting wheel 11 via the second counting wheel 10 and the third connecting gear 14.

When the winding shaft 2 is opened and the input shaft 6 rotates in the direction of the arrow X, the opening counter unit U opens the first to third counting wheels 9, 10, and 11 for opening. Are rotated in the anti-X direction, and the opening third counting wheel 11 is rotated at a predetermined rotational position in synchronization with the timing when the shutter curtain 1 reaches the fully open position. In this embodiment, each opening counting wheel 9, 1 is rotated.
0 and 11 are set so as to be in the home position return state (a state in which the numerical values on the outer peripheral surfaces of the counting wheels 9, 10 and 11 return to 0, 0 and 0). On the other hand, the closing counter D
When the take-up shaft 2 is closed and the input shaft 6 rotates in the anti-X direction, the closing first to third counting wheels 9, 10, 11 rotate in the anti-X direction, and the shutter curtain 1 is fully rotated. The third counting wheel for closing 1 is timed to reach the closed position.
1 is set to be in the home position return state. Further, the outer peripheral surface of the third counting wheel 11 is formed on a cam surface having a concave portion 11b located at a predetermined lower position in the home position return state. 9a, 10a, 11a
Is a heart-shaped cam fixed to the shaft support of the first, second, and third counting wheels 9, 10, and 11, and each of the counting wheels 9, 10, and
It is set so as to rotate integrally with 11.

On the other hand, limit switches LSU, LSD
Is housed in a large rectangular case body 15 that is long in the axial direction in order to constitute an explosion-proof type, and the case body 15 is arranged adjacent to the counter portions U and D in such a manner that the long sides thereof face the axial direction of the counter portions U and D. The counter units U and D are set so as not to interfere with each other. Then, set the limit switch to ON-OF
The base end of the switch lever 15a for switching F is
The case 15 is supported on the counter portion side of the case body 15 so as to be horizontally swingable, and a tip portion protrudes long in a direction away from the counter portion. Further, the switch lever 15a has a sliding roller 15b mounted on a protruding distal end thereof, and is configured to be urged toward an OFF operation direction by an urging machine (not shown).

Next, means for connecting the counter section and the limit switch will be described. Casing both leg sides 5a, 5
Below the b, an arm support shaft 16 is supported on one side of the counter section, and an L-shaped arm (corresponding to the first arm of the present invention) 17 is opposed to the third counting wheel 11. Is swingably supported in a state where movement in the axial direction is restricted,
The first leg of the L-shaped arm 17 is set to be shorter than the second leg, and the roller 17a bearing at the tip is set to face the third counting wheel recess 11b in the home position return state. . On the other hand, the longer second leg of the L-shaped arm 17 is
An engaging portion 17b is formed by notching on an upper end surface extending to an upper end portion of the casing 5 so that the engaging portion 17b is engaged with an arm bar 18 to be described later from the OFF operation direction side of the limit switch. Is set. Then, based on the rotation of the third counting wheel 11, the L-shaped arm 17 has a non-operating position in which the L-shaped arm roller 17a contacts the outer peripheral surface of the third counting wheel 11, and an operating position in which the L-shaped arm roller 17a falls into the concave portion 11b. In this case, the engaging portion 17b
Is set to swing with a swing stroke that is larger than the drop stroke into the concave portion 11b. Note that L
A regulating piece 17c for abutment with a locking cam 19 described later is integrally formed at a corner portion of the character arm 17.

On the other hand, the arm bar 18 corresponds to the second arm of the present invention, and its base end 18a can be swung horizontally above the first leg side 5a of the casing, that is, toward the first counting wheel 9 side. , And the tip is formed so as to extend beyond the third counting wheel 11 to reach the tip of the switch lever 15a of the limit switch, and is set so as not to interfere with the counter unit U. Then, a regulating piece 18b is integrally formed at the tip of the arm bar 18,
The restricting piece 18b is set so as to contact the sliding roller 15b at the tip of the switch lever 15a from the OFF operation direction side. As described above, the engaging portion 17b of the L-shaped arm 17 is engaged with the intermediate portion of the arm bar 18 from the OFF operation direction side of the limit switch, whereby the third counting wheel 11, the L-shaped arm 17, Arm bar 1
8. The switch lever 15a is linked.

That is, the third counting wheel 11 and the L-shaped arm 1
7, the arm bar 18, and the switch lever 15a, the L-shaped arm roller 17a is opposed to the outer peripheral surface of the third counting wheel 11, that is, the switch lever 15a is in the ON state when the L-shaped arm 17 is in the non-operating position. It is set as follows. In this state, the L-shaped arm 17 is in a state of resisting the urging force of the switch lever 15a via the arm bar 18, whereby the roller 17a slides against the outer peripheral surface of the third counting wheel 11 in a resilient manner. It is in a state where it is maintained in a contacting non-operating posture (see the upper limit switch LSU in FIG. 2). From this state, the third counting wheel 1
When 1 rotates to return to the home position, the roller 17a falls into the third counting wheel recess 11b.
The arm 17 has an operating posture in which the roller 17a falls into the concave portion 11b in a state where the urging force on the switch lever 15a side is received, and accordingly, the switch lever 15a is turned off.
The state is set so that the state is switched to the state F and the fully closed state or the fully opened state of the shutter curtain 1 is detected (see the lower limit switch LSD in the lower part of FIG. 2). Reference numeral 5c denotes a pair of concave grooves formed on the upper end surface of the casing second leg side 5b, and an intermediate portion of the arm bar 18 is loosely fitted in these concave grooves 5c so as to be horizontally swingable.

When the architectural shutter is to be installed, the limit switch device 4 needs to be initially set such as setting the fully open and fully closed positions. Cannot be performed in the state of detecting (set state), the opening or full closing counter units U and D are set to the home position return state, and the opening or closing limit switches LSU and LSD are set to O.
The reset state must be maintained in the N state, and a reset device for this purpose is configured as follows. That is, the reset shaft 20 constituting the reset device is located above the counter portions U and D and is rotatably supported by the first and second leg sides 5a and 5b of the casing. The heart-shaped cams 9a, 10a, 1
1a, the base end of a heart cam lever 20a for resetting each of the counting wheels 9, 10, 11 to the home position return state is fixed, and a substantially U-shaped support bracket 21 in a plan view is forcibly rotated. It is supported movably. The support bracket 21 has both ends of a gear shaft 21a on which the first to third connecting gears 12, 13, and 14 for interlocking the first to third counting wheels 9, 10, and 11 are supported. Fixed. Further, the reset shaft 20 has
The locking cam 19 facing the restriction piece 17c of the L-shaped arm 17 is integrally fixed.

On the other hand, an end of the reset shaft 20 on the second leg side 5b side projects outward from the second leg side 5b, and a base of the reset lever 22 is provided integrally therewith. The reset shaft 20 is set so as to be rotated by a moving operation. The reset lever 22 is set so as to be located at a set position in which the limit switch device 4 is in the down position in the set state. In this state, the heart cam lever 20a provided on the reset shaft 20 has the heart cams 9a, 10a, 11a and the locking cam 19
Has a positional relationship that does not interfere with the regulating piece 17c,
The support bracket 21 is inclined downward, and the first to third connecting gears 12, 13, 14 are provided with first to third counting wheels 9, 10, 1, respectively.
It is in a state of being interlocked and connected to 1. Here, between the reset shaft 20 and the casing 5, an ammunition device 20b is interposed, and urges the reset lever 22 to the side in which the reset lever 22 is brought to the lying posture.

On the other hand, in order to set the limit switch device 4 to the reset state, the reset lever 22 may be turned upward against the above-mentioned ammunition 20b to change the reset lever 22 to a reset position in which the reset lever 22 is in an upright state. In this state, reset axis 2
0 of the support bracket 21 swings upward, and the first to third connecting gears 12, 13, 14 are moved to the first to third counting wheels 9, 10, 1
At the same time, the heart cam lever 20a comes into contact with the heart-shaped cams 9a, 10a, 11a to reset the counting wheels 9, 10, 11 to the home position return state. Further, due to the swing to the reset position, the locking cam 19 is forcibly transformed into a state of interfering with the regulating piece 17c and separating the L-shaped arm roller 17a from the third counting wheel 11, that is, a state exceeding the non-acting position. Thereby, the arm bar 18 is set to position the limit switch in the ON region. By the way, the support bracket 21
Rotates integrally with the gear shaft 20, but in this case, the gear shaft 2
The amount of rotation of 1 is such that the support bracket 21
The rotation amount required to cut off the power transmission between the first and third counting wheels 9, 10, and 11 and the first to third counting wheels 9, 11 is larger than that.
The upward swing of the support bracket 21 is caused by the connection gears 12, 1
Gear retainers 12a, 13a, 14 provided above 3, 14
The support bracket 21 is set to rotate with respect to the reset shaft 20 in the restricted state.

On the other hand, a reset lever knob 22a is integrally formed at the tip of the reset lever 22, and an intermediate portion of a lock lever 23 is pivotally supported at the intermediate portion so as to be crossed. Has a locking claw 23a at the base end.
A lock lever knob 23b smaller than the reset lever knob 22a is formed at the tip, and the lock lever knob 23b is arranged in a state of overlapping the lower side of the reset lever knob 22a. Further, a coil spring 23c is interposed between the base end of the reset lever 22 and the tip end of the lock lever 23, and is urged in a direction to swing the lock lever 23 downward. When the reset lever 22 is at the set position, the engagement groove 23d provided on the tip end side of the lock lever 23 is provided.
Is engaged from above with an engaging pin 5d provided on the casing 5 side. In this state, the reset lever 22 is locked at the set position by being urged in the engaging direction by the coil spring 23c. Is set to

When the reset lever 22 is operated to the reset position from this state, the lock lever 23 is swung upward against the coil bullet 23c to release the engagement with the engagement pin 5d. Although the reset lever 22 swings upward, since the lock lever knob 23b of this embodiment is located below the reset lever knob 22a, the operation of lifting the lock lever knob 23b upward is directly performed by the reset lever knob 22a. Is set to swing upward. When the reset lever 22 and the lock lever 23 are pivoted upward to the reset position of the reset lever 22, the small lock lever knob 23
release the lock lever knob 23b, the coil bullet 23
In response to the urging force of (c), the reset lever knob 22b is swung in this state, so that the locking claw 23a on the base end side of the lock lever 23 is bored in the arm bar 18. 18c, the reset lever 22
Is set to lock to the reset position. On the other hand, in order to release the reset lever 22 from the reset position and return to the set position, the lock lever knob 23b is pivoted upward against the urging force of the coil bullet 23c.
After the engagement of the locking claw 23a with the engagement hole 18c is released and this state is reached, the reset lever 22 is reset to the reset shaft 2 position.
In the state of receiving the urging force of the armature 20b between the casing 0 and the casing 5, the arm 20b swings in the set position direction and automatically comes to the set position.
Reference numeral 3 is set so that the engaging groove 23d is automatically engaged with the engaging pin 5d to lock the reset lever 22 at the set position.

In the embodiment of the present invention configured as described above, the shutter curtain 1 detects the fully open position and the fully closed position by the limit switch device 4 of the counter type, and the opening / closing operation based on this is performed. However, in this case, even if the limit switch constituting the limit switch device 4 becomes explosion-proof and large, and the operation stroke of the switch lever 15a becomes large, it can be handled. In other words, the falling stroke into the concave portion 11b formed in the third counting wheel 11 is an amplified swing in the L-shaped arm engaging portion 5b, and the engaging portion 5b causes the intermediate portion of the arm bar 18 to swing horizontally. As a result, the working stroke at the distal end portion of the arm bar 18 is further increased and becomes large. Thus, the operation stroke of the switch lever is not restricted, unlike the configuration in which the switch lever of the limit switch directly contacts the outer peripheral surface of the counting wheel.

Further, in this device, since the limit switches LSU, LSD and the arm bar 18 are arranged so as not to interfere with the respective counter units U, D,
For example, even if the limit switches LSU and LSD are redesigned and the size of the casing and the lever length of the switch lever 15a are unbalanced, the limit switches LSU and LSD for the fully open and fully closed counter units U and D are used.
Can be dealt with by changing the layout of the second arm 18 or by adjusting the length of the second arm 18, etc. It is not necessary to change the design of even the parts, which can contribute to cost reduction and improve quality control.

In the embodiment of the present invention, the limit switch device 4 can be locked in the set state for detecting the fully open and fully closed positions of the shutter curtain 1 and the reset state in which the position is not detected, as described above. As a result, during the operation of setting the limit switch device 4 to the reset state and performing the initial setting or the like, the reset switch device 22 is erroneously reset.
The set lever 22 does not return to the set state even if the user touches the touch panel, and the user can work safely. In addition, the lock of the reset lever 22 to the reset position is simultaneously performed by swinging the lock lever 23 together with the reset lever 22, thereby improving the workability. The operation is performed by swinging the lever 23 from the set position to the reset position, so that the lever 23 does not accidentally return to the set position.

Further, in this device, since the lock lever knob 23b is small in size and does not protrude from the reset lever knob 22a, it is possible to release only the lock lever knob 23b when operating to the reset position to perform the lock operation. There is an advantage that it can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an architectural shutter.

FIG. 2 is a plan view of the limit switch device.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a view taken in the direction of arrows BB in FIG. 2;

FIG. 5 is a plan view showing a reset state of the limit device.

6 is a view taken in the direction of the arrows CC in FIG. 5;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shutter curtain 2 winding shaft 3 switch 4 limit switch device 5 casing 6 input shaft 7 support shaft 9 first counting wheel 11 third counting wheel 11b recess 12 connecting gear 15a switch lever 17 L-shaped arm 18 arm bar 20 reset 22 reset Lever 22a Reset lever knob 23 Lock lever 23a Locking claw 23b Lock lever knob 23c Coil ammunition U Opening counter device D Closing counter device LSU Opening limit switch LSD Opening limit switch

Claims (2)

[Claims] 1. A counter-type limit switch for detecting a door opening / closing position, wherein the counter-type limit switch is a maximum of a multi-digit counter wheel rotating in conjunction with opening and closing operation of a door. When the limit switch is turned ON / OFF based on the rotation of the digit counting wheel, a first arm that swings by interfering with an outer peripheral cam surface formed on the maximum digit counting wheel, A counter-type limit switch for an architectural opening / closing door body, comprising: a second arm that swings in conjunction with swinging of the arm, wherein the swinging of the second arm switches ON / OFF of a limit switch. 2. The counter according to claim 1, wherein the limit switch and the second arm are arranged so as to be turned ON / OFF on one side of the counting wheel, and do not interfere with the counting wheel. Type limit switch.