JPH078796Y2 - Safety device for electric shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a safety device for an electric shutter installed in an opening of a building.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of electric shutter, a sprocket provided on a winding shaft around which a shutter curtain is wound is connected to a switch sprocket by a transmission chain. , There are those in which the winding shaft is rotated in the forward and reverse directions.
By the way, in this case, the winding shaft and the opening / closing device are not directly integrated but are independently provided, for example, via a bracket or the like. Therefore, when a large earthquake or the like occurs, the winding shaft is not provided. The position of the switch and the switch may be displaced relative to each other in the axial direction, and the sprockets with which the transmission chain is suspended may be displaced.If the opening and closing operation is performed without knowing this, the sprockets will be separated. There is a risk of causing accidents such as the transmission chain that had been meshed with the shaft being released and the shutter curtain falling, and improvements in safety measures are desired.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a safety device for an electric shutter that eliminates these drawbacks. In an electric shutter in which the shutter curtain is opened / closed by chain transmission to the winding shaft, the drive control mechanism of the opening / closing device has a relative positional deviation between the opening / closing device side sprocket and the winding shaft side sprocket. The present invention is characterized in that an emergency stop means for detecting the occurrence of a stop to stop the drive of the switch is provided.

Further, the present invention is configured to surely detect the positional deviation between the opening / closing machine and the winding shaft to stop the operation of the shutter.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is a shutter curtain of an electric shutter installed in an opening of a building, and the shutter curtain 1 is a winding cylinder housed in a shutter case 2 arranged above the opening. It is wrapped around 4a.

Reference numeral 3 denotes an opening / closing device (electric motor M), which is provided in a mounting bracket 2a arranged in the shutter case 2. An output shaft 3b of the opening / closing device 3 penetrates the mounting bracket 2a. It projects outward and the drive sprocket 3a is fixed to the tip thereof.

Both ends of the winding shaft 4 of the winding drum 4a are supported by the left and right mounting brackets 2a via bearings 5, and the driven end of the driven sprocket 6a faces the drive sprocket 3a.
Are integrally fixed. Moreover, a connecting chain 8 is suspendedly engaged between the drive sprocket 3a and the driven sprocket 6 so that the driving force of the switch 3 is transmitted to the take-up shaft 4 via the transmission chain 8. Is configured.

On the other hand, 7 is a detection switch attached to the mounting bracket 2a such that the switch bar 7a contacts the boss 6a of the driven sprocket 6, and the detection switch 7 is, as shown in FIG. 3, the driven sprocket 6a. Is a mounting bracket
It is in the closed state when it is in the predetermined mounting position with respect to 2a. When the driven sprocket 6 is displaced in the axial direction from the mounting bracket 2a due to an earthquake or the like, the switch bar 7a is displaced to either side A or B, and the switch contact A
Alternatively, it is set to open B to turn off the power of the switch 3 to stop the opening / closing operation of the shutter. The detection switch 7 is also linked to an alarm device, and when a positional deviation of the winding shaft 4 is detected, an alarm means such as sounding a buzzer is activated at the same time.

An example of a general drive control circuit diagram of the switch 3 is shown in FIG. 4, where M is the switch 3, MB is a brake, E is a power source, KS is a main switch, F is a fuse, PBU, PBD and PBS are push button switches for raising, lowering, and stopping, and E
MS is an emergency stop switch, LSU and LSD are the upper limit,
Limit switches for lower limit, and RYU and RYD are rising and lower limit relay switches and their switch contacts, respectively, which are incorporated in a conventional wiring circuit, and in this embodiment, are connected in series with PBS. The detection switch 7 is provided because of the relationship of
The opening and closing of the switch 3 stops the drive of the switch 3.

In the embodiment of the present invention configured as described above, the push-button switches PBU, PBD, and PBS can be pressed to open, close, and stop the shutter curtain 1. If the driven sprocket 6 is misaligned due to such reasons, the connecting chain 8 may come off,
This is surely detected, and the drive of the switch 3 is restricted.

That is, when the driven sprocket 6 is misaligned with respect to the mounting bracket 2a, this is detected by the detection switch 7 to open the shutter drive control circuit, and thus the PB.
The switch 3 is not driven even if the U or PBD is pushed.
As a result, it is possible to prevent the connecting chain 8 from being unintentionally disengaged because the two sprockets 6 and 3a are not driven in the state of being displaced from each other as in the conventional case, and the shutter can be prevented in advance. Accidents such as curtain fall can be reliably prevented, and safety can be improved.

Further, in this embodiment, since the detection switch 7 is also linked to the alarm device, the positional deviation of the winding shaft 4 can be promptly confirmed even when the shutter is operated by remote control. By the way, in the above embodiment, the switch 3 is fixed to the mounting bracket 2a and is not displaced with respect to the mounting bracket 2a due to an earthquake or the like. Therefore, no special position shift detection switch is provided, but the switch 3 is Needless to say, if there is a risk of misalignment, a misalignment detection switch can be provided for this as well.

[Operation and Effect] In short, since the present invention is configured as described above, there is a possibility that the sprockets on the take-up shaft side and the switchgear side may be displaced due to an earthquake or the like and the chain may come off. In addition, the emergency stop means will detect this and stop the operation of the opening and closing machine, so without knowing that the position has shifted, the opening and closing machine will operate and the chain will come off and the shutter curtain will suddenly fall. This can be prevented and the safety can be improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a safety device for an electric shutter according to the present invention. FIG. 1 is an overall front view of the electric shutter, FIG. 2 is a plan view of relevant parts, and FIG. 3 is a detection switch. 4 is an opening / closing control circuit diagram. In the figure, 2a is a mounting bracket, 3 is a switch, 3a is a drive sprocket, 4 is a take-up shaft, 6 is a driven sprocket, 7 is a detection switch, 7a is a switch bar, and 8 is a connecting chain.

Claims (1)

[Scope of utility model registration request] 1. An electric shutter in which the driving force of an opening / closing device is chain-transmitted to a take-up shaft to open / close a shutter curtain. The drive control mechanism of the opening / closing device includes a sprocket and a winding on the opening / closing side. A safety device for an electric shutter, comprising an emergency stop means for detecting a positional shift relative to the sprocket on the take-up shaft side to stop the drive of the switch.