JP2013100697A - Safety device of shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive safety device of a shutter, which surely carries out a braking function at a low speed capable of sufficiently maintaining safety, when the shutter falls by self-weight, even if power supply is cut off, reduces noises and the wearing out of a member, and does not require labor and space for construction of facilities.SOLUTION: A safety device of a shutter includes power transmission means 3 for transmitting a torque generated by driving means to a take-up shaft 1. The power transmission means 3 includes: a plurality of passive gears 4 that rotates with the take-up shaft 1; a plurality of active gears that outputs the torque generated by the driving means; and a plurality of transmission belts 6 one-to-one connecting each of the active gears and the passive gears together. The passive gears 4 are connected via a clutch 7, and the power transmission means 3 connects the active gears and the passive gears 4 connected each other at a common rotary ratio. The clutch 7 includes a play 9 that avoids exchanging the torque with each of the passive gears 4 while the take-up shaft 1 of the shutter rotates.

Description

  The present invention relates to a shutter safety device that prevents a shutter from being released (dropped) from a take-up shaft by its own weight in an emergency such as when a power transmission chain is broken or detached.

  Conventionally, braking of a shutter that falls due to its own weight has been performed by mechanically or electrically detecting the falling speed of the shutter (see, for example, the following patent document). Even in this mode, the one that brakes the shutter by using the advancing and retreating of the brake (pad or claw) due to centrifugal force (for example, see Patent Document 1, Patent Document 3, and Patent Document 5 below), and the rotary encoder Rotating the shutter using electrical control to brake the shutter (see, for example, Patent Document 2 below), or by hitting the cam plate at high speed, The thing concerning a board (for example, refer the following patent document 4) is introduced.

JP 2006-307442 A JP 2006-152664 A JP 2001-032655 A Japanese Utility Model Publication No. 7-025438 JP 2007-270447 A JP 2010-1609 A

However, in the method disclosed in Patent Document 1, since the rotating disk that detects the centrifugal force rotates together with the take-up shaft, the shutter must be released at a high speed in order to generate a rotational speed effective for obtaining the braking force. In other words, the danger to get there is unavoidable.
The methods disclosed in Patent Document 2 and Patent Document 5 have a problem that electric power is indispensable due to electrical control.
The methods disclosed in Patent Document 3 and Patent Document 5 have a problem that the structure of the speed increasing device that compensates for the drawbacks of Patent Document 1 is complicated and the cost is high.
The method disclosed in Patent Document 4 has a problem that there are many factors that cause functional instability such as wear of a member due to impact, in addition to noise generated by always interfering with the cam plate.
Above all, these conventional means including the above-mentioned Patent Document 6 have a problem that the structure is extremely complicated, and the labor and space required for construction increase.

  The present invention has been made in view of the above circumstances, and even when the power is turned off, the brake function reliably at a low speed at which sufficient safety can be maintained even when the shutter is dropped due to its own weight. The purpose of the present invention is to provide an inexpensive shutter safety device that consumes less noise and components and does not require much space for facility construction.

A shutter safety device according to the present invention, which has been made to solve the above-mentioned problems, includes a winding shaft for winding a shutter, driving means for generating shutter winding power, and rotational force generated by the driving means. The power transmission means for transmitting to the take-up shaft is provided, and the features thereof are as follows.
That is, the power transmission means connects the plurality of passive gears that rotate together with the winding shaft, the plurality of active gears that output the rotational force of the driving means, and the active gear and the passive gear one-on-one. A plurality of transmission belts, wherein the passive gears share a rotational axis and are connected via a clutch that inhibits relative rotation of each passive gear, the active gears share the rotational axis, and each The active gear is connected so as to rotate integrally, the power transmission means connects the active gear and the passive gear connected to each other at a common rotation ratio, and the clutch has a shutter winding shaft that rotates. It is characterized by having a play for avoiding the transmission and reception of rotational force between the passive gears when they are in contact.

  Further, as a structure in which the connection structure of the active gear and the connection structure of the passive gear are replaced, the active gear is connected via a clutch that shares the rotation axis and prohibits relative rotation of each active gear. The passive gears share a rotating shaft and are connected so that the passive gears rotate together, and the power transmission means connects the active gear and the passive gear connected to each other at a common rotation ratio. The clutch can have a structure having a play that avoids transmission and reception of rotational force between the active gears when the winding shaft of the shutter is rotating.

  According to the present invention, a plurality of power transmission means set at a common rotation ratio are interposed when opening and closing the shutter, and each active gear or passive gear is provided with a play that avoids the transmission and reception of rotational force. Even when one of the power transmission means is disconnected by the structure including the clutch, it is possible to act as a brake against dropping of the shutter by receiving the rotational force by the clutch as the complementary mechanism. As before the cutting or the like, the rotational force of the driving means can be transmitted to the winding shaft of the shutter, and the operation of the shutter can be continued to a state required in the situation such as repair or closing.

  Further, in a normal operation state, the shutter winding shaft can be powered by adopting a clutch having a play that avoids the transfer of rotational force between the active gears when the shutter winding shaft is rotating. Since power is not applied to power transmission means other than power transmission means that are directly connected (including indirect ones with multiple gears, etc.), it is possible to avoid wear of power transmission means that are not loaded and to have a long service life As a result, practicality as a safety device is also increased.

  Because of this relatively simple structure, both space and construction work are reduced, and in the event of an accident such as cutting, it can be quickly restored with a relatively simple operation such as replacing the transmission belt. Therefore, a safety device with high safety can be realized.

It is the perspective view which showed the clutch and its peripheral structure in an example of the safety device of the shutter by this invention. It is the perspective view which showed the clutch and its peripheral structure in an example of the safety device of the shutter by this invention. It is sectional drawing seen in the axial direction which showed the clutch in an example of the safety device of the shutter by this invention, and its surrounding structure. 1 is a partially cutaway side view and a front view of an active gear showing a clutch and its peripheral structure in an example of a shutter safety device according to the present invention. It is sectional drawing seen in the axial direction which showed the key of the passive gear in the example of the safety device of the shutter by this invention, and its peripheral structure. 1 is a partially cutaway side view and a front view of an active gear showing a clutch and its peripheral structure in an example of a shutter safety device according to the present invention. It is the expanded sectional view seen from the axial direction which showed the key of the passive gear in the example of the safety device of the shutter by this invention, and its peripheral structure. It is explanatory drawing which shows the whole example of the safety device of the shutter by this invention.

Embodiments of a shutter safety device according to the present invention will be described below with reference to the drawings.
The example shown in FIGS. 1 to 5 shows a winding shaft 1 for winding a shutter, driving means 2 for generating shutter winding power, and power for transmitting the rotational force generated by the driving means 2 to the winding shaft 1. The transmission means 3 is provided.

The power transmission means 3 includes two same-diameter passive gears 4, 4 that rotate together with the winding shaft 1, two identical-diameter active gears 5, 5 that output the rotational force of the driving means 2, Two transmission belts (chains in this example) 6 are provided to connect the active gear 5 and the passive gear 4 one to one.
One power transmission means 3 is fixed to the winding shaft 1 and always transmits the rotational force from the active gear 5 to the passive gear 4. The other power transmission means 3 is passively driven from the active gear 5 during normal times. It exists as not transmitting torque to the gear 4. That is, the power transmission means 3 as the entire shutter device is substantially only one power transmission means 3.

  The winding shaft 1 in this example is a shaft around which a shutter is wound, and both ends thereof are horizontally supported by support portions provided on the left and right sides of the front opening where the shutter is attached, and the winding shaft The two passive gears 4 having the same number of teeth are shared at one end of 1 as a rotation axis that passes through the center of each of the winding shafts 1 (see FIG. 8). The two passive gears 4 inserted through the shaft are configured such that one of them is stopped from rotating with respect to the rotating shaft by the key 13 and the other without being stopped from rotating with respect to the rotating shaft by the key 13. The other passive gear 4 is provided with a position fixing structure that can be rotated by a stopper and a bush 12 so as not to move in the longitudinal direction of the rotating shaft (see FIG. 4).

In the examples of FIGS. 1 and 3 and 4, the passive gear 4 is connected via a clutch 7 that prohibits relative rotation between the passive gears 4, and the clutch 7 is a shutter winding shaft. A play (a gap that exists in the rotational direction between the clutches 7 and 7 that relays the rotational force between the two passive gears 4) 9 that avoids the transmission and reception of the rotational force between the passive gears 4 when the 1 rotates. Provided (see FIGS. 1 and 3).
At this time, the active gear 5 shares the rotating shaft 11 and is connected so that each active gear 5 rotates integrally. The active gear 5 in this example is one in which the two active gears 5 having the same number of teeth are integrally formed and fixed to a rotating shaft 11 penetrating each center so as not to rotate.

2 and FIGS. 5 to 7, the passive gear 4 shares a rotating shaft (in this example, the winding shaft 1) with each other in the center, and the rotating shaft and each passive gear. The key 8 that prohibits relative rotation between the four is shared and connected, and one of the passive gears 4 (if there are three or more power transmission means 3, at least one or the remaining one or more) is When the shutter winding shaft 1 is rotating, the play 10 that avoids the transmission and reception of the rotational force via the key 8 is drilled so that the width of the key groove of the corresponding passive gear 4 is wider than the width of the key 8. It prepares by installing (refer FIG. 5 (B) and FIG. 7 (B)).
At this time, the passive gear 4 shares a rotation axis and is connected so that each active gear 5 rotates integrally. For example, the two passive gears 4 having the same number of teeth are integrally formed and fixed to the winding shaft 1 so as not to rotate.

  The play 9, 10 employs the power transmission means 3 that connects the active gear 5 and the passive gear 4 that are connected to each other at a common rotation ratio (circumference ratio), and the like, and the phase of the two passive gears 4 The phase of the two active gears 5 is maintained by synchronizing the two active gears 5 directly connected to each other by the transmission belt 6 hung on each. In addition, it is desirable to provide the play 9, 10 on both the forward rotation side and the reverse rotation side as shown in the figure.

  Although illustration is omitted, if the clutch 7 and the key 8 similar to the passive gear 4 (see FIGS. 1 to 7) are provided in the active gear 5 instead of the passive gear 4, the play 9, 10 will be The power transmission means 3 that connects the active gear 5 and the passive gear 4 that are connected at a common rotation ratio is adopted, and the two passive gears 4 and the two active gears 5 are directly coupled to each other. It is maintained by synchronizing with the passive gear 4 of a sheet | seat and the transmission belt 6 hung on each.

  In the conventional electric shutter, the winding shaft 1 receives a rotational force from the driving means via the transmission belt such as the chain, and the shutter wound around the winding shaft is connected to the driving means via the transmission belt. The release is prevented by being braked by the brake function, but the shutter is released by its own weight when the brake function of the drive means is released, or when the transmission belt is disconnected or detached. It begins to fall, and its velocity increases at an accelerated rate due to gravity, causing damage to objects on the orbit.

  In the shutter safety device according to the present invention, even if one of the transmission belts 6 is cut or detached, the brake function of the driving means by the transmission belt 6 is released, and the shutter starts dropping due to its own weight. The function of the power transmission means 3 that the clutch 7 or the key remains through the exchange of the rotational force works, so that the shutter can be prevented from dropping and the shutter winding can be controlled continuously. Thereby, it is possible to avoid harming objects existing on the trajectory.

  The braking operation in this example is extremely stable because it is based on the mechanical action of the spare power transmission means 3 without any electrical control or artificial operation as described above.

1 winding shaft, 2 driving means,
3 power transmission means, 4 passive gear, 5 active gear, 6 transmission belt,
7 clutch, 8 key, 9 play, 10 play, 11 rotating shaft, 12 bush,

Claims (4)

Winding shaft (1) for winding the shutter, driving means (2) for generating shutter winding power, and power transmission means for transmitting the rotational force generated by the driving means (2) to the winding shaft (1). (3)
The power transmission means (3) includes a plurality of passive gears (4) that rotate with the winding shaft (1), a plurality of active gears (5) that output the rotational force of the driving means (2), A plurality of transmission belts (6) each connecting the active gear (5) and the passive gear (4) in a one-to-one relationship;
The passive gear (4) is connected via a clutch (7) that shares a rotation axis and prohibits relative rotation between the passive gears (4).
The active gears (5) share a rotation axis, and are connected so that each active gear (5) rotates integrally,
The power transmission means (3) connects the active gear (5) and the passive gear (4), which are connected to each other, at a common rotation ratio,
The clutch (7) is provided with a play (9) for avoiding transfer of rotational force between the respective passive gears (4) when the shutter winding shaft (1) is rotating. Safety device. Winding shaft (1) for winding the shutter, driving means (2) for generating shutter winding power, and power transmission means for transmitting the rotational force generated by the driving means (2) to the winding shaft (1). (3)
The power transmission means (3) includes a plurality of passive gears (4) that rotate with the winding shaft (1), a plurality of active gears (5) that output the rotational force of the driving means (2), A plurality of transmission belts (6) each connecting the active gear (5) and the passive gear (4) in a one-to-one relationship;
The passive gear (4) shares a rotation axis and is connected by sharing a key that prohibits relative rotation between the rotation shaft and each passive gear (4).
The active gears (5) share a rotation axis, and are connected so that each active gear (5) rotates integrally,
The power transmission means (3) connects the active gear (5) and the passive gear (4), which are connected to each other, at a common rotation ratio,
One of the passive gears (4) is provided with a play (9) for avoiding transmission and reception of rotational force via the key (8) when the shutter winding shaft (1) is rotating. Shutter safety device. Winding shaft (1) for winding the shutter, driving means (2) for generating shutter winding power, and power transmission means for transmitting the rotational force generated by the driving means (2) to the winding shaft (1). (3)
The power transmission means (3) includes a plurality of passive gears (4) that rotate with the winding shaft (1), a plurality of active gears (5) that output the rotational force of the driving means (2), A plurality of transmission belts (6) each connecting the active gear (5) and the passive gear (4) in a one-to-one relationship;
The active gear (5) shares a rotation axis and is connected via a clutch (7) that prohibits relative rotation between the active gears (5).
The passive gears (4) share a rotation axis and are connected so that each passive gear (4) rotates integrally,
The power transmission means (3) connects the active gear (5) and the passive gear (4), which are connected to each other, at a common rotation ratio,
The clutch (7) includes a play (9) for avoiding transmission and reception of rotational force between the active gears (5) when the shutter winding shaft (1) is rotating. Safety device. Winding shaft (1) for winding the shutter, driving means (2) for generating shutter winding power, and power transmission means for transmitting the rotational force generated by the driving means (2) to the winding shaft (1). (3)
The power transmission means (3) includes a plurality of passive gears (4) that rotate with the winding shaft (1), a plurality of active gears (5) that output the rotational force of the driving means (2), A plurality of transmission belts (6) each connecting the active gear (5) and the passive gear (4) in a one-to-one relationship;
The active gear (5) shares and connects a rotation axis and a key (8) that prohibits relative rotation between the rotation shaft and each active gear (5),
The passive gears (4) share a rotation axis and are connected so that each passive gear (4) rotates integrally,
The power transmission means (3) connects the active gear (5) and the passive gear (4), which are connected to each other, at a common rotation ratio,
One of the active gears (5) is provided with a play (9) for avoiding transmission and reception of rotational force through the key (8) when the shutter winding shaft (1) is rotating. Shutter safety device.

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