JPH0559877A - Motor-operated shutter - Google Patents

Abstract

PURPOSE:To reduce the load of a motor and shorten the opening/closing time of a shutter curtair) by applying the synthetic moment in the direction corresponding to the rotating direction when the shutter curtain is opened or closed. CONSTITUTION:An auxiliary spring 8 exciting the rotary shaft 7 of a motor 4 in the rotating direction when a shutter curtain 5 is opened is fitted to a winding shaft 2. For operation, the curtain 5 is fully opened, the first clutch C1 is disengaged to stop a winding drum 3, and the second clutch C2 is engaged. The auxiliary spring 8 stores exciting force via the continuous operation of the motor 4, the clutches C1, C2 are engaged, and the curtain 5 starts to be closed by the activation of the motor 4 in the reverse direction via the winding drum 3. The winding drum 3 is excited in the winding direction in addition to the moment of the curtain 5 and a balance spring 6 to shorten the closing time of the curtain 5. When the motor 4 is activated in the forward direction, the winding drum 3 is excited in the winding direction, and the opening time of the curtain 5 is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric shutter for opening and closing a shutter curtain by rotating a take-up drum forward and backward by a motor.

[0002]

2. Description of the Related Art For example, in a lightweight electric shutter used as a window shutter, the shutter curtain is opened and closed by driving a winding drum, which winds the shutter curtain, forward and backward by a motor. The take-up drum is provided with a balance spring that reduces the load on the switch.

This balance spring is mounted on a winding shaft that rotatably supports the winding drum, one end of which is fixed to the shaft and the other end of which is connected to the winding drum so that the shutter curtain is opened. I am urged. Therefore, the synthetic moment M applied to the winding drum M
₁ is a moment M _G due to the weight of the shutter curtain unwound from the drum as shown in FIG. 2 and a moment M due to the balance spring that cancels the weight.
_Calculated as the sum of _T.

The moment M _T due to the balance spring linearly changes in proportion to the number of revolutions of the winding drum, and the moment M due to the weight of the shutter curtain.
_G is proportional to the length of the unwound shutter curtain and the take-up radius, and the shutter curtain changes in a curve because the take-up radius becomes smaller as it is unwound. The moment M _{T of the} balance spring is set so that the combined moment M ₁ is as close to 0 as possible, so that the load of the motor can be reduced and the shutter can be opened and closed.

[0005]

However, recently, it has been desired to open and close the shutter curtain in a shorter time. For this reason, for example, if the balance spring has a high resilience, the shutter curtain can be opened. Since a large synthetic moment M ₁ acts in the rotating direction of the take-up drum when opening, it is possible to shorten the operation time at the time of opening. However, when the shutter curtain is closed, the take-up drum is resisted against the synthetic moment M _1. Since it must be rotated, a large load is applied in the direction opposite to the rotation direction of the motor, and the operation time cannot be shortened when the motor is closed.

Further, if the reduction ratio for transmitting the rotation of the motor to the take-up drum is reduced to increase the speed, the load on the motor increases, which hinders the opening and closing of the shutter curtain. Of course, if a large-capacity motor is used, the opening / closing time can be shortened, but there is a problem that the motor becomes large and it cannot be stored in a limited installation space.

Therefore, the present invention shortens the operation time at the time of opening and closing without using a large-capacity motor by causing the combined moment to act in the direction corresponding to the rotational direction when the shutter curtain is opened and closed. The challenge is to be able to do so.

[0008]

In order to solve this problem, the present invention relates to an electric shutter for opening and closing a shutter curtain by rotating a winding drum, which is rotatably supported by a winding shaft, by a motor. An auxiliary spring for energizing the curtain in the opening / closing direction when the shutter curtain is opened / closed is externally mounted on the winding shaft, one end side of the auxiliary spring is fixed to the winding shaft, and the other end side is the winding shaft as an axis. The shutter is connected to a rotating shaft of a motor through a rotating rotation transmitting mechanism, and the winding drum is detachably connected to the rotating shaft of the motor by a clutch, and the winding drum is rotated by the motor to release the shutter. A clutch operating device that disconnects the clutch when the curtain is in a fully open state or a fully closed state,
After the clutch is disengaged, the motor drive circuit is continued for a certain period of time so that the auxiliary spring stores a biasing force.

[0009]

According to the present invention, since the rotary shaft of the motor and the winding drum are detachably connected by the clutch,
When the shutter curtain is opened and closed, the clutch can be connected to transmit the rotation of the motor to the winding drum to open and close the shutter curtain. Then, when the shutter curtain is fully opened or fully closed, the clutch is operated by the clutch operating device, so that the rotation of the motor is not transmitted to the winding drum and the shutter curtain is reliably stopped.

Further, even after the clutch is disengaged, the motor is continuously driven by the motor drive circuit for a certain period of time, so that the auxiliary spring is wound against the repulsive force and the shutter curtain is fully opened. The biasing force is stored such that it is biased downward and is biased upward in the fully closed state.

When the motor is started with the clutch engaged, a large moment due to the urging force stored in the auxiliary spring acts on the rotating shaft of the motor in the rotating direction thereof, so that the load on the motor is reduced and the shutter is released. The opening and closing time of the curtain can be shortened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a perspective view showing an electric shutter according to the present invention, FIG. 2 is a graph showing the relationship between the number of rotations of a winding drum and a moment, and FIG. 3 is a time chart showing an opening / closing operation of a shutter curtain.

Reference numeral 1 in the figure denotes an electric shutter which opens and closes a shutter curtain 5 by rotating a winding drum 3 rotatably supported by a winding shaft 2 by a motor 4 in forward and reverse directions. Balance springs 6 for offsetting the weight of the shutter curtain 5 are provided on both ends of the winding shaft 2, one end of which is fixed to the winding shaft 2 and the other end of which is attached to the winding drum 3. It is attached so that it is wound as the winding drum 3 rotates.

The moment M of this balance spring 6
_T is the moment M due to the weight of the shutter curtain 5.
The combined moment M ₁ with _G is selected so that it acts slightly upward when the shutter curtain 5 is fully open and becomes 0 when the shutter curtain 5 is fully closed.

An auxiliary spring 8 for energizing the rotating shaft 7 of the motor 4 in the rotating direction when the shutter curtain 5 is opened and closed is installed on the winding shaft 2, and one end of the auxiliary spring 8 is fixed to the shaft 2. In addition, the other end side is connected to the rotation shaft 7 of the motor 4 via a rotation transmission mechanism R that rotates about the winding shaft 2.

The motor 4 is attached to the shaft 2 such that its rotation shaft 7 is parallel to the winding shaft 2, and one end of the rotation shaft 7 meshes with an internal gear 9 of the winding drum 3. The pinion 10 is connected via the first clutch C _1, and the winding drum 3 is connected to the rotating shaft 7 by the clutch C _{1 so as} to be detachable.

The rotation transmission mechanism R connected to the other end of the rotary shaft 7 of the motor 4 rotates the gear 11 attached to the motor rotary shaft 7 and the auxiliary spring 8 in a state of being meshed with the gear 11. A gear 12 attached to the end side is provided, and an auxiliary spring 8 and a rotating shaft 7 of the motor 4 are provided.
A clutch C ₂ for interleaving the clutch is interposed.

Numeral 13 is an open / close switch (not shown)
The motor 4 is rotated in a predetermined direction by the switch, and a switch signal is output from the upper limit switch and the lower limit switch (not shown) when the shutter curtain 5 is in the fully open state and the fully closed state, and then a predetermined time It is a motor drive circuit that continues to rotate and stops the motor 4.

After the shutter curtain 5 is in the fully closed state or the fully opened state, the time during which the motor 4 is continuously rotated depends on the moment M _G generated by the weight of the shutter curtain 5 and the balance spring 6. It is set by the magnitude of the moment M _T , the strength of _the auxiliary spring 8, the reduction ratio of the gears 11 and 12, and the like.

Reference numeral 14 is a clutch operating device for connecting and disconnecting the first and second clutches at a predetermined timing. The clutch operating device 14 has a function of the first clutch C when the shutter curtain 5 is fully opened or fully closed.
_An operation signal for disconnecting ₁ is output, and an operation signal for disconnecting the second clutch C ₂ is output when the biasing force of the auxiliary spring 8 acts in the direction opposite to the rotation direction of the motor 4 during opening and closing of the shutter curtain 5. Is made to do.

FIG. 2 shows a moment M _G caused by the weight of the shutter curtain 5 used in the electric shutter of the present invention and a moment M caused by _the balance spring 6.
₅ is a graph showing the relationship between _{T, the} moment M _S generated by the auxiliary spring 8 and the combined moment M thereof, and the number of revolutions of the winding drum 3. The horizontal axis represents the number of revolutions of the winding drum 3, the left end side indicates the fully open state, and the right end side indicates the fully closed state. Further, the vertical axis represents the moment, (+) indicates the moment acting upward, and (-) indicates the moment acting downward.

When the shutter curtain 5 is unwound from the take-up drum 3, the take-up radius gradually decreases, and the length of the shutter curtain 5 unwound by one rotation gradually decreases. Moment M when _0
G always falls in proportion to its length and acts on its own.
It changes in a curved shape as shown in.

The moment M _T generated by the balance spring 6 linearly changes in proportion to the number of revolutions of the winding drum 3 so as to always rise and is slightly higher than the absolute value of the moment M _G in the fully opened state. It is selected to be large and equal to the absolute value of the moment M _{G in} the fully closed state.

Therefore, the combined moment M ₁ of the moment M _G and the moment M _T acts upwardly on the fully open side and slightly downwardly on the fully closed side. Further, the moment M _S generated by the auxiliary spring 8 is
Like the moment M _T of the balance spring 8, it is linearly changed in proportion to the number of revolutions of the winding drum 3 and is selected so that the moment becomes 0 at a substantially intermediate position of the shutter curtain 5.

The above is an example of the configuration of the present invention, and its operation will be described below with reference to FIGS. 2 and 3. FIG. 3 is a time chart showing the opening / closing operation. First, when the shutter curtain 5 is in the fully open state, the first clutch C ₁ is activated by the switch signal from the upper limit switch.
At the same time when the winding drum 3 is stopped and the winding drum 3 is stopped, the second clutch C ₂ is engaged (FIGS. 2T _{1 and} 3T ₁ ).

The motor 4 is further driven for a predetermined time, and the rotation of the motor 4 stops the rotation of the motor 4 when the auxiliary spring 8 stores an urging force so as to generate a downward moment M _{S. 1} and C
₂ is connected and the rotating shaft 7 of the motor 4 is braked (FIGS. 2T ₂ and 3T ₂ ).

Then, when the motor 4 is started in the reverse direction with the clutches C ₁ and C ₂ engaged (FIG. 3T ₃ ),
The rotation of the motor 4 is transmitted to the winding drum 3 to open the shutter curtain 5, and at this time, the moment M _S generated by the biasing force stored in the auxiliary spring 8 is applied to the motor 4
Because they act in the direction of lowering winding winding drum 3 via the rotation shaft 7 (FIG 2T ₃ through T _4), the shutter curtain 5
In addition to the moments M _{G and} M _T of the balance spring 6, the winding drum 3 is biased in the unwinding direction, and the closing time of the shutter curtain 5 can be shortened.

Next, the moment M of the auxiliary spring 8
_{When S} becomes 0, the second clutch C ₂ is disengaged so that the moment M _s in the opposite direction does not act on the rotating shaft 7 of the motor 4 (FIGS. 2T _{4 and} 3T ₄ ). Therefore, when the shutter curtain 5 is closed, the combined moment M acting on the winding drum 3 from the intermediate position of the shutter curtain 5 to the fully closed state is equal to the combined moment M ₁ of the shutter curtain 5 and the balance spring 6,
The motor 4 is biased in the same direction as the rotation direction of the motor 4 (FIGS. 2T _{4 to} T _{5 and} 3T _{4 to} T ₅ ). in this way,
Since the combined moment M is always urged in the same direction as the rotation direction of the motor 4 from the fully open state to the fully closed state of the shutter curtain 5, the closing time can be shortened.

When the shutter curtain 5 is fully closed, the first clutch C ₁ is disengaged and the winding drum 3 is stopped by the switch signal from the lower limit switch, and at the same time the second clutch is closed. C ₂ is connected (FIG. 2T _5, FIG. 3T ₅ ). The motor 4 continues to be driven for a predetermined time, and when the auxiliary spring 8 stores the urging force so as to generate the upward moment M _S , the rotation of the motor 4 is stopped, the clutches C ₁ and C ₂ are connected, and the motor 4 Apply a brake to the rotating shaft 7 (Fig. 2T ₆ ,
Figure 3T ₆ ).

When the motor 4 is started in the forward direction with the clutches C ₁ and C ₂ engaged (FIG. 3T ₇ ),
The rotation of the motor 4 is transmitted to the winding drum 3 and the shutter curtain 5 is opened. At this time, since the moment M _S generated by the urging force stored in the auxiliary spring 8 acts in the direction of winding up the winding drum 3 via the rotation shaft 7 of the motor 4 (T _{7 to} T _{8 in} FIG. 2), the shutter curtain 5 In addition to the moments M _{G and} M _T of the balance spring 6, the winding drum 3 is biased in the winding direction, and the opening time of the shutter curtain 5 can be shortened.

Next, as in the case of closing the shutter curtain 5, when the moment M _S of the auxiliary spring 8 becomes zero, the moment M _s in the opposite direction does not act on the rotating shaft 7 of the motor 4, Disengage the second clutch C ₂ (FIGS. 2T _{8 and} 3T ₈ ). Therefore, when the shutter curtain 5 is opened, the combined moment M acting on the winding drum 3 from the intermediate position of the shutter curtain 5 to the fully opened state is equal to the combined moment M ₁ of the shutter curtain 5 and the balance spring 6, Four
Will be urged in the same direction as the rotation direction of
T ₈ ~T _9, Figure 3T ₈ ~T _9).

As described above, since the large combined moment M is applied in the same direction as the rotation direction of the motor 4 from the fully closed state to the fully opened state of the shutter curtain 5, the opening time can be shortened. Then, the above operation is repeated to open and close the shutter curtain 5.

Thus, when the shutter curtain 5 is closed, the moment M ₁ acting upward is offset by the auxiliary spring 8 and the combined moment M is acted downward, and when the shutter curtain 5 is opened,
Since the moment M ₁ acting downward is canceled by the auxiliary spring 8 and the combined moment M is exerted upward, both when closing and opening the shutter curtain, a large capacity motor is not used for a short time. The shutter curtain 5 can be opened and closed with.

In the embodiment, the case in which the moment M _S of the auxiliary spring 8 is used in both the opening and the closing is described, but the present invention is not limited to one of
For example, the moment M _S may be used only when the shutter curtain 5 is opened from the fully closed state.

The above-described embodiment is not limited to the case where the balance spring 6 is used together, but may be the case where only the auxiliary spring 8 is used.
And the rotation shaft 7 of the motor 4 are not limited to be connected via the clutch C ₂ , but the auxiliary spring 8 and the rotation shaft 7 of the motor 4 may be connected to each other without the clutch C ₂ .

However, in this case, the moment M _S of the auxiliary spring 8 is, for example, as shown in FIG. 4, absolute values P _{1 and} P ₂ of the moment M _G due to the weight of the shutter curtain 5 at the time of fully opening and at the time of fully closing. It is set so that it changes with a slope substantially equal to the straight line passing through. Then, moment Ms is when closed is smaller than the absolute value of the moment M _G, when open is to be greater than the moment M _G, when the shutter curtain 5 is fully opened state and the fully closed state, the first clutch Turn off C ₁ to store the urging force in the auxiliary spring 8.

Therefore, the composite moment M changes depending on the opening / closing direction of the shutter curtain 5, and always acts freely when the shutter curtain 5 is closed and always acts freely when the shutter curtain 5 is opened. In this way, the shutter curtain 5 can be opened and closed only by the elastic force of the auxiliary spring 8, and the motor 8 is hardly loaded when opening and closing.
The opening / closing time of the shutter curtain 5 can be shortened without using a large capacity motor.

[0038]

As described above, according to the present invention, after the shutter curtain is fully opened or fully closed, the urging force stored in the auxiliary spring by the motor is used to generate the synthetic moment in the rotational direction. Since the shutter curtain is opened and closed by operating it in the direction corresponding to, there is no large biasing force that prevents the opening and closing operation in the direction opposite to the rotating direction, and it is not necessary to use a large capacity motor. It has an excellent effect that the opening and closing time of the shutter curtain can be shortened.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electric shutter according to the present invention.

FIG. 2 is a graph showing the relationship between moment and rotation speed.

FIG. 3 is a time chart showing an opening / closing operation.

FIG. 4 is a graph showing the relationship between the moment and the rotation speed in another example.

[Explanation of symbols]

1 ... Electric shutter 2 ... Winding shaft 3 ... Winding drum 4 ... Motor 5 ... Shutter curtain 6 ... Balance spring 7・ ・ ・ ・ ・ Rotary shaft of motor 8 ・ ・ ・ ・ ・ Auxiliary spring 9 ・ ・ ・ ・ ・ Internal gear 10 ・ ・ ・ Pinion 11 ・ ・ ・ Gear 12 ・ ・ ・ ・ ・ Gear C _1, C ₂ ... Clutch 13 ... Motor drive circuit 14 ... Clutch operating device

Claims (2)

[Claims] 1. An electric shutter that opens and closes a shutter curtain (5) by rotating a winding drum (3) rotatably supported by a winding shaft (2) by a motor (4) in a forward and reverse direction. An auxiliary spring (8) for urging the curtain (5) in the opening and closing direction of the winding shaft (5) is mounted on the winding shaft (2), and one end of the auxiliary spring (8) is wound around the winding shaft (2). Is fixed to the rotary shaft (7) of the motor (4) via a rotation transmission mechanism that rotates around the winding shaft (2) as an axis, and the rotary shaft () of the motor (4) 7), the winding drum (3) is detachably connected by a clutch (C ₁ ), and the winding drum (3) is rotated by a motor (4) so that the shutter curtain (5) is in a fully opened state or all closed Clutch operating device off the clutch (C ₁₎ when it becomes a state (14), and is continued a predetermined time the drive of the motor (4) after removing the clutch (C _1), the auxiliary spring ( An electric shutter characterized by comprising a motor drive circuit (13) for storing a biasing force in (8). 2. A clutch (C ₂ ) for disengaging the auxiliary spring (8) from the rotation shaft (7) of the motor (4) is interposed in the rotation transmitting mechanism, and the auxiliary spring is opened and closed during opening and closing of the shutter curtain (5). The electric shutter according to claim 1, wherein the clutch (C ₂ ) is disengaged by the clutch operating device (14) when the urging force of (8) acts in a direction opposite to the rotation direction of the motor (4).