JP2514189Y2 - Opening / closing device for electric shutter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric shutter in which a large number of slats are wound up and rewound by an electric motor.

[0002]

2. Description of the Related Art An opening / closing device for an electric shutter provided at an entrance of a store, a show window, an opening of a bed of a special work vehicle, or the like usually has a large number of slats (1) wound as shown in FIG. A take-up drum (2) is rotatably supported at the upper end of a shutter mounting portion, and the take-up drum (2) is provided in the vicinity thereof with an electric motor with a speed reducer (hereinafter simply referred to as an electric motor) (3). Is rotated via the sprockets (4) and (5) and the roller chain (6).

When the shutter is opened, the electric motor (3) is normally rotated, the winding drum (2) is normally rotated (clockwise in FIG. 4), and the slats (2) are slid on the winding drum (2). It is opened by letting it wind up 1). When the shutter is closed, the electric motor (3) is reversed and the winding drum (2)
And the slats (1) are unwound from the winding drum (2) and closed.

Since the electric shutter (3) is provided with the electric motor (3) separately from the winding drum (2), the electric motor (3) is provided around the winding drum (2).
Since the sprocket (4) (5) and the roller chain (6) for transmitting the power of the electric motor (3) and the electric motor (3) to the winding drum (2) must be provided, a large installation area is required.

Further, the conventional electric shutter is opened and closed by manually rotating the output shaft of the electric motor (3) by a chain (7) or other appropriate means in case of power failure or failure of the electric motor (3). Was there. Therefore, the output shaft of the electric motor (3) has to be rotated many times, and the work is very troublesome.

Therefore, the Applicant has a very compact structure in which the electric motor is incorporated in the winding drum, and when the manual operation is performed, the edge of the electric motor and the winding drum is easily cut. Provided an electric shutter opening / closing device that allows the slat to be opened and closed manually (see Japanese Utility Model Application No. 1-135271 (Kaikaihei 3-73395).
No.))).

In principle, the above-mentioned opening / closing device has an electric motor (3) rotatably mounted in a winding drum (2) via bearings (10) and (10) as shown in FIG. The output shaft (3a) of (3) is coupled to the winding drum (2) via the clutch mechanism (11), and one end of the winding drum (2) and the other end of the electric motor (3) are supported. It is a thing.

[0008]

Since the opening / closing device is small, it is easy to install. However, since the clutch mechanism (11) is inside the take-up drum (2), it is troublesome to assemble and the clutch mechanism (11) is manually operated.
The release mechanism for releasing was large.

Further, it is difficult to incorporate a control device for controlling the stop position of the electric motor (3) when the shutter is released or when the shutter is closed.

As a device incorporating a control device for the electric motor (3), for example, Japanese Patent Publication No. 61-55354,
There are those disclosed in JP-B-63-596 and JP-B-63-42366. However, these devices require a large number of gears and cams, have a very complicated structure and are large in size, the winding drum has a large diameter, and the opening / closing device itself has a large size.

Further, since a large number of gears and cams are driven, the load is large, a large electric motor is required, and the cost is high.

This invention intends to provide an opening / closing device for an electric shutter which has a simple structure and is capable of winding and rewinding slats, controlling an electric motor, and easily switching to a manual operation. It is a thing.

[0013]

A switchgear according to the present invention comprises:
A main body case fixed to the first fixed wall surface, a spring support shaft whose one end is fixed to a second fixed wall surface facing the first fixed wall surface, and a drum holder rotatably mounted on the main body case. A drum cap that is fitted and fixed at one end and is rotatably mounted on the support shaft, and is freely rotatable across the winding drum that is fitted and fixed at the other end and inside the main body case and the winding drum. Mounted on the spring support shaft, which is fixed to the inner surface of the winding drum and is coupled to the output shaft of the electric motor, and one end of which is locked to the drum cap. , A worm wheel and a worm wheel, the other end of which is locked to the inner end of the spring support shaft. A clutch mechanism that is fixed to the end of the motor on the main body side and has a worm shaft slidable in the tangential direction of the worm wheel supported through the main body case, and the worm is coupled to the worm shaft, and the main body case. A locking mechanism that is mounted and locks the sliding movement of the worm wheel by engaging the worm shaft with the worm wheel and the worm meshing with each other and making the worm non-rotatable. And a pair of limit cams that rotate in a fixed reduction ratio in conjunction with the drum holder, and are mounted on the main body case.
The automatic stop mechanism is provided with a pair of limit switches for controlling the electric motor that are F-controlled.

[0014]

In the opening / closing device having the above structure, the body case and the ends of the spring support shaft are fixed to the first and second fixed wall surfaces, and at the time of automatic opening / closing, the worm wheel of the clutch mechanism and the worm are engaged with each other to lock. The mechanism keeps the worm shaft locked. If you rotate the motor in this state,
Since the motor is fixed to the main body case by the clutch mechanism, the take-up drum rotates, and the rotation of the take-up drum causes the slat to be taken up or rewound on the take-up drum to open and close the shutter.

Further, as the winding drum rotates, the winding spring is twisted so that the elastic force is accumulated when the slat is rewound. Therefore, the elastic force of the winding spring and the load on the slat are always balanced, and the winding and rewinding of the slat can be performed lightly.

When a pair of limit cams are rotated together with the winding drum and the slats are wound up to the rising end, one limit cam turns off the corresponding limit switch to stop the electric motor, and conversely the slats. When is rewound to the lower end, the other limit cam turns off the corresponding limit switch to stop the electric motor.

In manual operation, the lock mechanism is operated to release the worm shaft and slide the worm shaft in the releasing direction. Then, the worm disengages from the worm wheel (the clutch mechanism is disengaged), and the worm wheel becomes free. Therefore, if the slat is manually raised and lowered in this state, the winding drum and the electric motor rotate freely and can be easily opened and closed. At this time as well, the winding spring and the slat are balanced, so that the slat can be operated lightly.

As described above, since the worm wheel and the worm are used for the clutch mechanism, the clutch mechanism can be released and returned lightly.

Further, since the limit cam always rotates in conjunction with the winding drum, the relationship between the limit cam and the limit switch does not change even if a manual operation is performed, and the setting of the automatic stop position does not go wrong.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the opening / closing device includes a drum holder (2) having a bearing function at the open ends on both sides of a winding drum (20) for winding a large number of slats.
1) and a drum cap (22) are attached. Then, at the end of the winding drum (20), the drum holder (2
1) via which the main body case (23) is relatively rotatably attached, and the drum cap (22) is rotatably supported by the spring support shaft (24) to support the main body case (23) and the spring support. The winding drum (20) is rotatably supported by attaching and fixing the protruding end of the shaft (24) to an appropriate wall surface, that is, the first and second fixed wall surfaces facing each other.

An electric motor (25) is built into the winding drum (20) on the main body case side, and the main body side small diameter portion (26) is inserted into the main body case (23) by penetrating the drum holder (21). The electric motor (2
5) is rotatably supported by the drum holder (21). The output shaft (25a) of the electric motor (25) is coupled to the drum drive rotor (27) fixed to the inner surface of the winding drum (20), and the rotation of the output shaft (25a) is rotated by the drum drive rotor (27). Take-up drum (2
0). On the other hand, the electric motor (2
The brushes (30) and (31) protruding from 5) are brought into contact with the dot-shaped brush connector (32) and the ring-shaped brush connector (33) attached to the main body case (23), respectively. Therefore, the electric motor (25) is
Brush (30) (3
1) and the brush connectors (32) (33) are always in contact with each other,
The power supply is not interrupted. The brush connector (3
2) (33) is connected to a power source (not shown).

A winding spring (35) is mounted on the outer circumference of the hollow shaft portion (34) of the drum cap (22) and the spring support shaft (24), and one end of the winding spring (35) is locked to the drum cap (22). The other end is locked to a spring washer (36) attached to the inner end of the hollow shaft (34). The winding spring (35) is twisted by the drum cap (22) by the rotation of the winding drum (20), and the elastic force is accumulated as the winding drum (20) rotates in the rewinding direction. It is set so as to always balance with the load of the slats unwound from the winding drum (20).

The small diameter portion (2) of the electric motor (25) on the main body side
A clutch mechanism (37) for properly fixing the electric motor (25) to the main body case (23) is attached to 6). As shown in FIG. 2, the clutch mechanism (37) includes a worm wheel (40) and a worm (4).
It is composed of 1) and. The worm wheel (40) is attached to the end of the small diameter portion (26) on the main body side of the electric motor (25). On the other hand, the worm (41) has a body case (2
3) Penetrate both side walls of worm wheel (40)
Is integrally attached to a worm shaft (42) slidably supported along the tangential direction of the. Warm (41)
May be formed integrally with the worm shaft (42) or may be formed separately and integrally connected.

The worm shaft (42) is slidable from a position where the worm wheel (40) and the worm (41) mesh with each other to a position where the worm wheel (40) and the worm (41) are completely separated from each other, and Worm shaft (42)
The worm shaft (42) is always pushed in the releasing direction by the pushing spring (43) attached to the.

In this clutch mechanism (37), the worm shaft (42) does not rotate only by the load from the worm wheel (40).

At the end of the worm shaft (42), a locking groove (4
4) is formed, and as shown in FIG. 3, a lock mechanism attached to the outer surface of the main body case (23), for example, a lock lever (a lock lever attached so as to be swingable in a direction orthogonal to the worm shaft (42)). The locking recess (46) of 45) is fitted. That is, when the worm wheel (40) and the worm (41) are meshed with each other, the locking groove (44) of the worm shaft (42) coincides with the mounting position of the lock lever (45). On the other hand, the lock lever (45) is swingable around the support shaft (47) as a fulcrum, and when it is erected, the locking recess (46) fits into the locking groove (44) of the worm shaft (42), Secure the worm shaft (42). The lock lever (45) can be fixed by an appropriate means in the standing position.

An automatic stop mechanism (50) for controlling the stop position of the electric motor (25) is incorporated in the upper part of the body case (23). The automatic stop mechanism (50) includes a pair of limit cams (55) (56) that rotate in a constant reduction ratio in conjunction with the drum holder (21) and a pair of limit switches (57) (58). . Further, a limit shaft gear (51), a driven gear (52), a pair of limit gears (53) (54), etc. are provided as a mechanism for rotating the limit cams (55) (56) at a constant reduction ratio.

The limit shaft gear (51) is attached to the body case (2
3) is rotatably supported in parallel with the electric motor 25 in the center of the upper portion of 3), and has a small diameter gear 60 at the rear end. The driven gear (52) is the limit shaft gear (5
It is fixed to the tip of 1) and meshes with a drive gear (61) attached to the small diameter portion (26) of the electric motor (25).

The pair of limit gears (53) (54) are
The limit shaft gear (51) is arranged on both sides of the limit shaft gear (51) so as to be rotatably supported by the main body case (23) and meshed with the gear (60) of the limit shaft gear (51). The limit cams (55) (56) are connected to the limit gears (53) (5
4) The rear end surface is concentrically attached to the rear end surface, and control recesses (62) (63) are formed at one location on each peripheral surface.

A pair of limit switches (57) (58)
Are attached to the side wall of the body case (23) in a distributed manner, and the upper ends of the control levers (64) (65) are brought into contact with the peripheral surfaces of the corresponding limit cams (55) (56). In the limit switches (57) and (58), the upper ends of the control levers (64) and (65) have limit cams (5).
5) When it fits into the control recesses (62) (63) formed in (56), the electric circuit is turned off and the electric motor (2)
5) is to be stopped.

In the automatic stop mechanism (50), the limit gear (53), the limit cam (55), and the limit switch (57) (hereinafter referred to as "first") determine the winding end and the other limit. A gear (54), a limit cam (56), and a limit switch (58) (hereinafter referred to as a second) are used to determine the rewinding end.
That is, when the slat is wound up to a predetermined position, the control lever (64) of the first limit switch (57) is fitted in the control recess (62) of the first limit cam (55), and conversely. When is rewound to a predetermined position, the control lever (65) of the second limit switch (58) fits into the control recess (63) of the second limit cam (56). Further, the drive gear (61) and the driven gear (52) are arranged so that the first limit cam (55) and the second limit cam (56) do not rotate more than one revolution between the rewinding end and the winding end. ), The limit shaft gear (51), the first limit gear (53), and the second limit gear (54).

The above-mentioned opening / closing device engages the worm wheel (40) and the worm (41) during automatic opening and closing,
The locking recess (46) of the lock lever (45) is locked in the locking groove (44) of the worm shaft (42), and the clutch mechanism (37) is connected. In this state, the electric motor (2
5) is fixed to the body case (23) and cannot rotate. Therefore, when the electric motor (25) is normally rotated, the winding drum (20) is normally rotated via the drum driving rotor (27) to wind up the slat. Then, when the slat is wound up to a predetermined position, the control lever (64) of the first limit switch (57) fits into the control recess (62) of the first limit cam (55), and the electric motor (25) stops. And stop winding.

On the contrary, when the electric motor (25) is reversed,
Winding drum (2) via drum drive rotor (27)
0) is reversed and the slats are rewound. Then, when the slats are returned to the predetermined positions, the second limit cam (5
In the control recess (63) of 6), the second limit switch (5
The control lever (65) of 8) fits in, the electric motor (25) stops, and rewinding is stopped.

When the slat is rewound during the rotation of the winding drum (20), the winding spring (35) is twisted and stores elastic force accordingly, so that the slat and the winding spring (35) are always kept. Balances with each other, the winding drum (20) can be lightly rotated, and the load on the electric motor (25) can be reduced.

When manually operating, the lock lever (4
5) rock to release the worm shaft (42). Then, the worm shaft (4
2) is slid in the releasing direction, the worm wheel (40) and the worm (41) are separated, and the clutch is released. In this state, the electric motor (25) can rotate freely. Therefore, if the slat is manually raised and lowered, the winding drum (20) and the electric motor (25) are freely rotated accordingly, and the opening and closing operation can be easily performed.

When returning to the automatic operation, the worm shaft (42) is rotated several times and pushed into the main body case (23), the worm wheel (40) and the worm (41) are engaged with each other, and the lock lever (45) is engaged. Of the worm shaft (42) by engaging the engaging recess (46) with the engaging groove (44).
Then, the worm shaft (42) may be fixed.

Since the above-mentioned opening / closing device uses the worm wheel (40) and the worm (41) for the clutch mechanism (37), manual and automatic switching can be performed with a light force, and when the manual switching is performed, the worm is used. If the shaft (42) does not move immediately, a slight movement of the slat will disengage the worm wheel (40) from the worm (41) and the worm shaft (42) will slide. On the contrary, when switching to automatic, the worm (41) and the worm wheel (40) can be easily meshed with each other by simply turning the worm shaft (42) lightly, and the worm wheel does not have to be moved. You can return without doing.

Further, in the automatic stop mechanism (50), the first limit cam (55) and the second limit cam (56) rotate together with the winding drum (20) even during manual operation, so that the first limit cam (50) (55) and the first limit switch (57) and the second limit cam (56)
The positional relationship between the second limit switch (58) and the second limit switch (58) will not go out of order, so no matter how many times manual and automatic switching is performed, the electric motor (25) will always have the electric motor (25) in advance when the automatic operation is resumed. Stops at the set position and does not require readjustment.

The pushing spring (43) mounted on the worm shaft (42) is not always necessary, and the worm shaft (42) may be manually slid. Further, the mechanism for rotating the limit cams (55) (56) is not limited to the above embodiment.

[0041]

According to the present invention, since the electric motor and the winding drum are rotated together during the manual operation, the clutch mechanism can be provided outside the winding drum, and the operation of the clutch mechanism is easy. Now you can do it. Also, since the worm wheel and worm are used for the clutch mechanism, manual and automatic switching can be performed with a light force regardless of the winding drum side.

Further, since the automatic stop mechanism of the electric motor has a very simple structure and can be downsized, it can be compactly incorporated in the main body case, and the winding drum can be downsized, so that the entire apparatus can be realized. Can be made smaller.

Further, since the automatic stop mechanism does not need to be readjusted once the stop position of the electric motor is set, it can be used by quickly returning it from the manual mode to the automatic mode.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a switchgear according to the present invention.

FIG. 2 is an enlarged vertical sectional side view showing the internal structure of the main body case.

FIG. 3 is an enlarged side view showing a lock lever mounting structure.

FIG. 4 is a schematic side view showing a conventional opening / closing device.

FIG. 5 is a cross-sectional view showing a basic configuration of an improved conventional opening / closing measure.

[Explanation of symbols]

 20 Winding Drum 23 Body Case 24 Spring Support Shaft 25 Electric Motor 27 Drum Drive Rotor 35 Winding Spring 37 Clutch Mechanism 40 Worm Wheel 41 Worm 42 Worm Shaft 45 Lock Lever 50 Automatic Stop Mechanism 51 Limit Shaft Gear 53 (1st) Limit Gear 54 (2nd) Limit Gear 55 (1st) Limit Cam 56 (2nd) Limit Cam 57 (1st) Limit Switch 58 (2nd) Limit Switch

Claims (1)

(57) [Scope of utility model registration request] 1. A main body case fixed to a first fixed wall surface, a spring support shaft having one end fixed to a second fixed wall surface facing the first fixed wall surface, and rotatably attached to the main body case. The drum holder mounted is fitted and fixed at one end, and the drum cap rotatably mounted on the support shaft is fitted and fixed at the other end, and the winding drum extends between the main body case and the winding drum. A rotatably built-in electric motor, a drum drive rotor fixed to the inner surface of the winding drum and coupled to the output shaft of the electric motor, and attached to the spring support shaft, one end of which is the drum. A worm wheel and a worm which are locked to the cap and whose other end is locked to the inner end of the spring support shaft; The wheel is fixed to an end of the electric motor on the main body side, and a worm shaft slidable in a tangential direction of the worm wheel is supported by the main body case so as to penetrate therethrough, and a clutch mechanism in which the worm is coupled to the worm shaft, A lock mechanism attached to the main body case, which locks the sliding movement of the worm wheel by engaging the worm shaft with the worm wheel and the worm engaged with each other and making the worm non-rotatable. A pair of limit cams that are freely supported and rotate at a constant reduction ratio in conjunction with the drum holder;
An opening / closing device for an electric shutter, comprising an N-OFF controlled automatic stop mechanism including a pair of limit switches for controlling the electric motor.