JP2010001609A - Braking device of shutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive braking 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, and which reduces noises and the wearing out of a member. <P>SOLUTION: This braking device includes a winding shaft for winding the shutter, a ratchet wheel which rotates together with the winding shaft, a stop plate which is engaged with a pawl of the ratchet wheel, and a driving means for making the drop plate advance/recede with respect to the pawl of the ratchet wheel. The driving means comprises: a speed-increasing gear which rotates together with the winding shaft so that the stop plate can advance with respect to the pawl of the ratchet wheel by the rotation of the winding shaft in the release direction of the shutter; a driven shaft which rotates together with a passive gear engaged with the speed-increasing gear; a centrifugal clutch mechanism which rotates together with the driven shaft so that its clutch portion can advance/recede in a centrifugal direction along with its rotation; a floating disc which is brought into contact with the clutch portion and driven following its rotation; and a transmission mechanism which converts the motion of the floating disc to the advancement/receding of the stop plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shutter braking device that prevents a shutter from being released (dropped) from a winding 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

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 by performing 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.

  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. It is an object of the present invention to provide an inexpensive shutter braking device that works with less noise and wear of members.

  The braking device for a shutter according to the present invention made to solve the above problems includes a winding shaft for winding the shutter, a claw wheel that rotates together with the winding shaft, a stop plate for the claw of the claw wheel, Drive means for advancing and retracting the stop plate relative to the claw of the claw wheel, and the drive means advances the stop plate relative to the claw of the claw wheel by rotating the take-up shaft in the shutter release direction. As described above, the speed increasing gear that rotates together with the winding shaft, the driven shaft that rotates together with the passive gear applied to the speed increasing gear, and the clutch portion that rotates together with the driven shaft and advances and retracts in the centrifugal direction along with the rotation. A centrifugal clutch mechanism, a floating disk that contacts the clutch portion that has advanced in the centrifugal direction and that is driven by the rotation, and a transmission mechanism that changes the movement of the floating disk to advance and retreat of the stop plate. And butterflies.

  It is good also as a structure which provided the claw of the said nail | claw wheel around the hook shape so that the nail | claw of the said claw wheel may suppress retreat of the said stop plate when the said stop plate was engaged.

  According to the present invention, the speed increasing gear is attached to the winding shaft of the shutter, and the centrifugal clutch mechanism is provided on the driven shaft that rotates together with the passive gear applied to the speed increasing gear, so that the shutter is dropped at a relatively low speed stage. Therefore, a braking device having a high safety can be realized with a relatively simple structure.

  Further, by adopting a configuration in which the stop plate is engaged with the pawl of the claw wheel by moving the stop plate with the centrifugal clutch mechanism as a driving source, the stop plate is applied to the pawl at the same time. The movement of the driven shaft and the floating disk is simultaneously stopped via the winding shaft provided with the above, and the adverse effect on the braking operation due to the mutual movement and interference of the moving bodies can be avoided.

  Furthermore, by providing a plurality of claws of the claw wheel in a hook shape, it is possible to further improve the application of the stop plate to the claw and maintain a stable braking posture.

Embodiments of a shutter braking device according to the present invention will be described below with reference to the drawings.
The example shown in FIGS. 1 to 5 is a drum (floating disk) that rotates a stop plate 3 on a claw of a claw wheel 2 fixed to a winding shaft 1 of a shutter (not shown) via a centrifugal clutch mechanism 4. The centrifugal force for operating the centrifugal clutch mechanism 4 is generated through the speed increasing gear 6 driven by the winding shaft 1 and the driven shaft 7 interlocked with the speed increasing gear 6. It is something to be made.

  The winding shaft 1 is a shaft around which a shutter is wound, and both ends thereof are respectively supported horizontally by support portions provided on the left and right sides of the front opening where the shutter is attached, and the winding shaft The speed increasing gear 6 having a sufficient number of teeth and the claw wheel 2 serving as a brake disk are provided at one end of 1 at an interval from the end side, and the chain wheel 8 is provided at the other end via a chain 8. Sprockets 9 that receive power are provided in a state in which each of the winding shafts 1 is shared as a rotation shaft that passes through each center (see FIG. 6).

  The support portion at the one end is composed of a pair of support plates 18, 18, and the claw wheel 2 is sandwiched between the pair of support plates 18, 18. The stop plate 3 is horizontally passed over the pair of support plates 18 and 18 so that the engagement edge 10 faces the claw of the ratchet wheel 2, and the engagement edge 10 is swung vertically. The engaging edge 10 is pivotally supported in a state where it can advance and retreat with respect to the claw wheel 2 and can engage with and disengage from the claw (see FIGS. 3 to 5).

The pair of support plates 18 and 18 support the winding shaft 1 and the driven shaft 7 in parallel (see FIGS. 2 and 3).
The driven shaft 7 is a power shaft of the driving means 11 for swinging the stop plate 3, and the end plate 18 on the front end of the driven shaft 7 is connected to the support plate 18. The centrifugal clutch mechanism 4 is supported by being separated. The centrifugal clutch mechanism 4 receives the rotation of the speed increasing gear 6 by a passive gear 12 provided adjacent to the speed increasing gear 6 at one end of the driven shaft 7 and rotates the centrifugal clutch mechanism 4 (FIG. 4).

  The centrifugal clutch mechanism 4 includes a base 17 that rotates together with the driven shaft 7 and a symmetrical pair of clutch portions 13 that advance and retreat in the centrifugal direction due to the centrifugal force as the rotor 17 rotates. An urging member (not shown) for returning the portion 13 in the centripetal direction is provided. When the clutch portion 13 is shifted to the centrifugal side, the drum 5 comes into contact with the inner surface of the freely rotating drum 5 with the same rotation shaft as the driven shaft 7 and encourages the drum 5 to follow (see FIG. 5).

  For example, in the example, the clutch portion 13 is supported by the base 17 so that one end of each longitudinal direction is swingable, and returns to the centripetal direction between the other end and the center portion of the base 17. A spring is urged. On the other hand, the drum 5 in this example is sandwiched between the support plate 18 adjacent to the claw wheel 2 and the centrifugal clutch mechanism 4, and is included in the centrifugal clutch mechanism 4 with respect to the driven shaft 7. And is rotatably inserted. With this configuration, as the driven shaft 7 rotates at an increased speed, one end portion of the clutch portion 13 is shifted to the centrifugal side by an amount corresponding to the centrifugal force generated by the rotation of the driven shaft 7. To do.

  The drum 5 is provided with an active crank 14 projecting on the outer edge thereof, and a link connecting the active crank 14 to a tip portion of the active crank 14 and a passive portion 15 projecting to the engaging edge 10 side of the stop plate 3. A transmission mechanism is configured to change the movement of the drum 5 to advance and retreat of the stop plate 10 by supporting 16 (wire or rod). In the transmission mechanism in this example, a spring 19 is used to urge the stop plate 3 while being connected to the support plate 18 in a direction in which the engagement edge 10 is always separated from the pawl wheel 2. The structure that prompts the user to return to the non-braking state is adopted.

  In the conventional electric shutter, the winding shaft 1 receives a rotational force from the power source 20 via the chain 8, and the shutter wound around the winding shaft 1 passes through the chain 8. However, when the brake function of the power source 20 is released, or when the chain 8 is cut or detached, the shutter is moved by its own weight. The release starts by, and the speed increases at an accelerated rate by gravity, so that the objects existing on the trajectory are harmed.

  In this example, when the shutter is released and dropped as described above, the driven shaft 7 applies the rotational force of the winding shaft 1 due to the release falling speed of the shutter via the speed-up gear 6 to the passive gear. However, since the number of the passive gears 12 is sufficiently smaller than the number of the speed increasing gears, the rotational speed of the driven shaft 7 is the gear ratio between the speed increasing gear 6 and the driven gear 12. The clutch portion 13 moves in the centrifugal direction with a slow release falling speed (which needs to be set faster than the speed at which the shutter is wound or released by power). Advances and touches the inner surface of the drum.

  In this way, the drum 5 that has obtained a rotational force by contacting the inner surface of the clutch portion 13 transmits the swing of the active crank 14 that is integrally provided to the passive portion 15 via the link 16. The engaging edge 10 of the stop plate 3 that is integrated with the passive portion 15 is drawn in the direction of the claw of the claw wheel 2 (see FIG. 5).

  When the stop plate 3 hits the claw of the claw wheel 2, the rotation of the winding shaft 1 is stopped and the rotation of the driven shaft 7 that is the drive shaft of the centrifugal clutch mechanism 4 is also stopped. As a result, the clutch portion 13 of the centrifugal clutch mechanism 4 also returns to the centripetal direction by the biasing means, and the pulling force of the drum 5 against the stop plate 3 is released. As a result, a force is applied to the stop plate 3 in the direction of separating from the claw of the claw wheel 2 by the return action of the spring 19.

  As described above, at the same time that the stop plate 3 is engaged with the claw, the movement of the driven shaft 7 and the drum 5 is simultaneously stopped via the winding shaft 1 provided with the stop plate 3, and the movement of each of these moving bodies is stopped. The braking operation ends without conflicting or interfering with each other. Further, even if the stop plate 3 comes off the claw after the braking operation and the release fall occurs again, the same braking operation is repeated many times, and the release fall speed exceeds a predetermined dangerous speed. There is nothing.

  For example, when the stop plate 3 is engaged, when the claw of the claw wheel 2 is covered with the claw of the stop plate 3 so that the claw of the claw wheel 2 is retracted, the shutter is released and dropped more than the centrifugal direction. If the hook is inclined or bent in the rotation direction, the state after braking of the shutter becomes more stable.

  The braking operation in this example is extremely stable because it does not involve any electrical control or artificial operation as described above, and is exclusively due to the mechanical action of natural law and rotation transmission via gears. .

  The centrifugal clutch unit may transmit power to the floating disk by friction like a drum brake mechanism, or transmit power by engaging irregularities such as a claw being caught like a ratchet mechanism. It may be something that performs. Further, the advance / retreat of the clutch portion in the centrifugal direction at that time may be caused by parallel movement or may be caused by swinging.

It is the perspective view which showed the combination of the main member in an example of the braking device of the shutter by this invention. It is the front view which showed the combination of the main member in an example of the braking device of the shutter by this invention. It is explanatory drawing which showed operation | movement of the main member in an example of the braking device of the shutter by this invention. It is explanatory drawing which showed operation | movement of the main member in an example of the braking device of the shutter by this invention. It is explanatory drawing which showed operation | movement of the main member in an example of the braking device of the shutter by this invention. It is the schematic which showed planarly an example of the principal part structure of the shutter using the shutter braking device by this invention.

Explanation of symbols

1 winding shaft, 2 claw wheel, 3 stop plate, 4 centrifugal clutch mechanism, 5 drum,
6 speed-up gear, 7 driven shaft, 8 chain, 9 sprocket, 10 engagement edge,
11 Drive means, 12 Passive gear, 13 Clutch part,
14 active cranks, 15 passive parts, 16 links, 17 bases, 18 bearing plates,
19 springs, 20 power sources,

Claims (1)

A winding shaft that winds the shutter, a claw wheel that rotates together with the winding shaft, a stop plate related to the claw of the claw wheel, and a drive unit that advances and retracts the stop plate relative to the claw of the claw wheel,
The drive means includes a speed increasing gear that rotates together with the winding shaft so that the stop plate advances with respect to the pawl of the ratchet wheel by rotation of the winding shaft in the release direction of the shutter, and the speed increasing gear. A driven shaft that rotates together with the passive gear, a centrifugal clutch mechanism that rotates together with the driven shaft, and the clutch portion advances and retracts in the centrifugal direction along with the rotation. A shutter braking device comprising: a driven disk that is driven; and a transmission mechanism that changes the movement of the disk to advance and retreat of the stop plate.

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