Door power generation device

Abstract

To provide a power generator for a door, which generates power when the door is opened / closed and which can be easily installed in various doors such as a sliding door not equipped with a knob.SOLUTION: This power generator for doors comprises: a generator 70; a spiral spring 50; an input shaft 30A; a winding-up power transmission mechanism 40; and a power transmission mechanism for power generation 60. The winding-up power transmission mechanism winds up the spiral spring while the input shaft is rotated forward, and releases a winding-up shaft while the input shaft is rotated backward. The power transmission mechanism for power generation transmits a rotating force of the winding-up shaft to a power generation shaft, driving the generator, while the winding-up shaft is rotating in a releasing direction. One of gears of the winding-up power transmission mechanism is disengaged from a gear to which power is next transmitted while the input shaft is rotating backward. One of gears of the power transmission mechanism for power generation is disengaged from a gear to which power is next transmitted while the winding-up shaft is rotating in a winding-up direction.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a door power generation device that generates electricity by opening and closing a door.

Background Art

[0002] Patent Document 1 discloses a door power generation device configured to wind up a spiral spring by utilizing the closing operation of a door, and when the knob is rotated to open the door, the spiral spring is released and a generator is driven by the energy accumulated in the spiral spring.

[0003] In this door power generation device, when the door closes, a large gear is rotated to transmit power to a gear meshed with the large gear, thereby winding up the spiral spring. Further, when the knob is rotated in the direction to open the door, the cam rotates in conjunction with the rotation, and the meshing between the large gear and the gear is disengaged. As a result, the spiral spring is released, and the energy accumulated in the spiral spring is transmitted to a gear train for power transmission, and the generator is driven.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the above door power generation device, a generator can be driven by the opening and closing operation of the door, the generated electric power can be stored in a capacitor or a battery, and DC power can be supplied to electrical devices around the door, such as lighting devices and electronic locks.

[0006] However, when the door is closed in the above-described door power generation device, a latch is inserted into the hole of the opening where the door is installed, and when the knob is rotated, the latch is configured to be pulled into the door side. This is for use in an opening / closing mechanism or an electronic lock having this opening / closing mechanism. Therefore, the above-described door generator has problems such as being unable to be installed on a sliding door without a knob, or being difficult to retrofit to an existing hinged door even if it has a knob.

[0007] One aspect of the present disclosure aims to enable easy installation on various doors, such as a sliding door without a knob, in a door power generation device that generates electricity by the opening and closing operation of a door.

Means for Solving the Problem

[0008] A door power generation device according to one aspect of the present disclosure includes a generator, a spiral spring, an input shaft, a winding power transmission mechanism, and a power generation power transmission mechanism. Among these, the generator includes a power generation shaft that is a rotation shaft for power generation, and is configured to generate electricity when the power generation shaft is rotated. The spiral spring includes a winding shaft that is a rotation shaft for winding, and is wound and stores energy when the winding shaft is rotated in the winding direction.

[0009] When the winding shaft is released, the winding shaft rotates in the release direction, which is the opposite direction to the winding direction, by the energy. The input shaft rotates in the forward or reverse direction according to the opening and closing operation of the door.

[0010] In the present disclosure, the opening and closing operation of the door includes not only the opening and closing of the door itself, such as a hinged door or a sliding door, but also the opening and closing operation of a knob or a lever handle operated by a user when the door is opened and closed, or the opening and closing operation by a closer that biases the door in the closing direction to close the door when the door is opened.

[0011] Next, when the input shaft rotates in the forward direction, the winding-up power transmission mechanism transmits the rotational force to the winding-up shaft to wind up the spiral spring, and when the input shaft rotates in the reverse direction, the winding-up shaft is released. Further, when the winding-up shaft rotates in the release direction, the power generation power transmission mechanism transmits the rotational force of the winding-up shaft to the power generation shaft and rotates the power generation shaft to drive the generator.

[0012] Thus, according to the door power generation device of the present disclosure, when the door is opened (or closed) and the input shaft rotates in the forward direction, the spiral spring is wound up and energy is accumulated. When the door is closed (or opened) and the input shaft rotates in the reverse direction, the generator is driven by the energy. Therefore, power can be generated by the generator through the opening and closing operation of the door, and the generated power can be output.

[0013] In addition, the winding-up power transmission mechanism and the power generation power transmission mechanism each include a plurality of gears that mesh with each other to transmit power. And at least one of the gears constituting the winding-up power transmission mechanism has a rotation shaft that moves so that the meshing with the next gear to which power is transmitted is disengaged when the input shaft rotates in the reverse direction.

[0014] Therefore, when the input shaft rotates in the reverse direction, the rotation of the input shaft is not transmitted to the winding-up shaft, and the winding-up shaft can be completely released to output the energy accumulated in the spiral spring to the power generation power transmission mechanism.

[0015] Also, at least one of the gears constituting the power generation power transmission mechanism has a rotation shaft that moves so that the meshing with the next gear to which power is transmitted is disengaged when the winding-up shaft rotates in the winding-up direction. Therefore, when the spiral spring is being wound up, the rotation of the winding-up shaft of the spiral spring is not transmitted to the power generation shaft through the power generation power transmission mechanism.

[0016] Therefore, when the spiral spring is wound up, no load is applied from the generator side to the input shaft side, and it is possible to prevent the load from making it impossible to properly wind up the spiral spring. In addition, when the spiral spring is wound up, since it is possible to suppress the rotation of the power generation shaft and the power generation operation of the generator, safety can be enhanced.

[0017] For example, in the door power generation device described in Patent Document 1, the gears meshed with the large gear and the gear group that transmits power from this gear to the generator rotate not only during power generation that drives the generator but also when the spiral spring is wound up. For this reason, when the spiral spring is wound up, problems such as an increase in the load applied to the large gear, making it difficult to close the door, or the generator being accidentally driven occur. However, according to the door power generation device of the present disclosure, it is possible to suppress the occurrence of such problems.

[0018] Here, in the door power generation device of the present disclosure, the winding-up power transmission mechanism may include a plurality of gears whose rotating shafts move. In this way, during power generation by the generator, the winding-up shaft can be more favorably released, and power generation by the generator can be carried out more efficiently.

[0019] Also, in the spiral spring, the gear of the winding-up shaft to which the rotational force is transmitted from the input shaft via the winding-up power transmission mechanism may be configured to idle with respect to the winding-up shaft when the winding-up amount of the spiral spring reaches its maximum. That is, by using the gear of the winding-up shaft as a so-called torque gear, it is possible to suppress the further rotation of the winding-up shaft and damage to the spiral spring after the winding-up of the spiral spring is completed.

[0020] Also, the power transmission mechanism for power generation may be configured to increase the speed of rotation from the winding-up shaft side with a plurality of gears and transmit it to the power generation shaft. In this way, the power generation shaft of the generator can be rotated at a higher speed, and the power generation efficiency of the generator can be enhanced. Also, in this case, the power generation amount can be adjusted by changing the gear ratio of the gears constituting the power transmission mechanism for power generation. In this way, the power generation shaft of the generator can be rotated at a higher speed, and the power generation efficiency of the generator can be enhanced. Also, in this case, the power generation amount can be adjusted by changing the gear ratio of the gears constituting the power transmission mechanism for power generation.

[0021] Next, the door power generation device of the present disclosure may further include a battery holder to which a plurality of rechargeable batteries are detachably attached, and a charging circuit that converts the output from the generator into a predetermined DC voltage and charges the plurality of rechargeable batteries. In this way, stable DC power can be supplied from the plurality of rechargeable batteries mounted on the battery holder to an external electrical device.

[0022] In this case, when a dry battery is mounted on the battery holder instead of the rechargeable battery, a changeover switch may be provided to cut off the charging power supply path from the charging circuit to the battery holder and reduce the number of dry batteries output to the external electrical device from the number of rechargeable batteries.

[0023] That is, the rechargeable battery having the same shape as the dry battery has an output voltage lower than the output voltage of the dry battery: 1.5V, and is about 1.2V. For this reason, for example, when the battery holder is configured to output 6V by mounting five rechargeable batteries in series, when mounting dry batteries on the battery holder and outputting the same voltage, it is necessary to use four dry batteries.

[0024] Therefore, if the changeover switch is provided as described above, when the battery mounted on the battery holder is changed from a rechargeable battery to a dry battery, the power supply path from the charging circuit can be cut off, and the number of batteries supplying power to the external device can be reduced from five to four.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0026] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [Embodiment] As shown in FIG. 1, the door power generation device 2 of the present embodiment is attached to a sliding door 6 used for manually opening and closing an entrance / exit 4 through which people enter and exit, and drives an internal generator 70 by the opening and closing operation of the sliding door 6 to generate electricity.

[0027] As shown in FIG. 2, the door power generation device 2 includes a battery holder 10, a charging circuit board 12 for charging a rechargeable battery attached to the battery holder 10 with the electric power generated by the generator 70, and a drive device 20 for driving the generator 70 by the opening and closing operation of the sliding door 6.

[0028] The battery holder 10 protrudes from the rectangular housing 2A of the door power generation device 2, and the charging circuit board 12 and the drive device 20 are housed in the housing 2A. The battery holder 10 is configured to be able to detachably mount five rechargeable batteries. The charging circuit board 12 is mounted with a charging circuit that converts the electric power generated by the generator 70 into DC power to charge the rechargeable batteries attached to the battery holder 10. The charging circuit charges each rechargeable battery by applying a charging voltage to the series circuit of the five rechargeable batteries attached to the battery holder 10. Further, the charging circuit is also provided with output terminals for outputting the voltage across the series circuit of the rechargeable batteries as a power supply voltage for driving external devices.

[0029] The rechargeable battery mounted on the battery holder 10 has the same shape as, for example, a AA dry battery, and a dry battery can also be mounted on the battery holder 10 instead of the rechargeable battery. However, the output voltage of the rechargeable battery is lower than the output voltage of the dry battery: 1.5V, and is about 1.2V. Therefore, if five dry batteries are mounted on the battery holder 10 and the voltage across the series circuit of the dry batteries is output, the power supply voltage of the external device will become 7.5V, which is higher than the output voltage of the five receiving batteries: about 6V.

[0030] Therefore, the battery holder 10 is provided with a changeover switch 14 for the user to operate to switch the output voltage to the same 6V as that of the rechargeable battery when a dry battery is mounted. This changeover switch 14 is configured to switch the number of batteries in the series circuit connected to the output terminal of the power supply voltage from five in the normal state to four so that a voltage of 6V, the same as that of the rechargeable battery, can be output by the series circuit of four dry batteries mounted on the battery holder 10.

[0031] In addition, the changeover switch 14 is configured to prevent a charging current from flowing through the dry battery by cutting off the charging path from the charging circuit when the number of batteries in the series circuit is switched to four.

[0032] Next, the configuration of the drive device 20 that drives the generator 70 will be described. As shown in FIGS. 3 to 6, the drive device 20 includes four plates 22, 24, 26, 28 arranged in parallel at a predetermined interval. Among these plates 22 to 28, a closer torque spring 30 and a generator 70 are integrally assembled on the first plate 22 disposed at the lowermost position in the figure, with the spiral spring 50 sandwiched therebetween.

[0033] The closer torque spring 30 includes a tape-shaped pull-out piece 32 that is pulled out from the housing 2A when the sliding door 6 moves in the opening direction and is pulled into the housing 2A when the sliding door 6 moves in the closing direction. This pull-out piece 32 is wound around a bobbin 34 rotatably provided in the case 36 of the closer torque spring 30. Note that the pull-out piece 32 does not necessarily have to be in the shape of a tape and may be a linear wire.

[0034] The bobbin 34 is biased in the direction of winding the pull-out piece 32 by a biasing member such as a coil spring, and pulls the pull-out piece 32 into the case 36 with a constant torque. One end of the pull-out piece 32 is fixed, as shown in FIG. 1, to the open-end portion that abuts against the sliding door 6 when the sliding door 6 is in the closed position, above the access opening 4.

[0035] Therefore, when the sliding door 6 moves in the opening direction, the pull-out piece 32 is pulled out, the bobbin 34 rotates, and the rotation axis of the closer torque spring 30 becomes the input shaft 30A, rotating in the positive direction, specifically, in the direction of arrow A1 shown in FIG. 7.

[0036] Also, when the sliding door 6 moves in the closing direction, the pull-out piece 32 is wound around the bobbin 34, and the input shaft 30A of the closer torque spring 30 rotates in the direction opposite to the movement of the sliding door 6 in the opening direction, that is, in the direction of arrow B1 shown in FIG. 8.

[0037] Next, the spiral spring 50 is composed of a leaf spring wound in a spiral shape and includes a winding shaft 50A for winding up this leaf spring. And the rotation of the input shaft 30A of the closer torque spring 30 is transmitted to the winding shaft 50A via a power transmission mechanism 40 for winding. The power transmission mechanism 40 for winding includes a second gear GA2 and a third gear GA3. The second gear GA2 and the third gear GA3 are for transmitting the rotation of the input shaft 30A to the winding shaft 50A when the sliding door 6 moves in the opening direction and the input shaft 30A rotates in the positive direction.

[0038] The power transmission mechanism 40 for winding includes a second gear GA2 and a third gear GA3. The second gear GA2 and the third gear GA3 are for transmitting the rotation of the input shaft 30A to the winding shaft 50A when the sliding door 6 moves in the opening direction and the input shaft 30A rotates in the positive direction.

[0039] Therefore, a first gear GA1 that meshes with the second gear GA2 and transmits the rotation of the input shaft 30A to the second gear GA2 is fixed to the input shaft 30A of the closer torque spring 30. Further, a fourth gear GA4 that meshes with the third gear GA3 and rotates the winding shaft 50A of the spiral spring 50 in the winding direction of the spiral spring 50 by the rotation of the third gear GA3 is fixed to the winding shaft 50A of the spiral spring 50.

[0040] The first gear GA1 protrudes upward from the case 36 of the closer torque spring 30, and the second gear GA2 and the third gear GA3 are rotatably arranged between the third plate 26 and the fourth plate 28 so as to have the same height as the first gear GA1 and be able to mesh with each other.

[0041] On the other hand, the third plate 26 and the fourth plate 28 are provided with support holes 26A, 26B and 28A, 28B that rotatably support the rotation shafts P2, P3 of the second gear GA2 and the third gear GA3, respectively.

[0042] As shown in FIG. 7, these support holes 26A, 26B and 28A, S28B are elongated holes for moving the second gear GA2 and the third gear GA3 so that the first gear GA1 to the fourth gear GA4 mesh with each other in order when the input shaft 30A rotates in the direction of arrow A1.

[0043] In this state, the rotation of the input shaft 30A is transmitted to the winding shaft 50A of the spiral spring 50, the winding shaft 50A rotates in the direction of arrow A2 shown in FIG. 7, the spiral spring 50 is wound, and energy is accumulated in the spiral spring 50.

[0044] Next, as shown in FIG. 8, when the input shaft 30A rotates in the direction of arrow B1, the second gear GA2 and the third gear GA3 move in the reverse direction within the support holes 26A, 26B and 28A, 28B.

[0045] When the second gear GA2 and the third gear GA3 move in this way, the second gear GA2 and the third gear GA3 move away from the third gear GA3 and the fourth gear GA4, and the power transmission system that transmits the rotation of the input shaft 30A to the winding shaft 50A is interrupted.

[0046] Therefore, when the sliding door 6 is moving in the closing direction, the winding shaft 50A is released, and it rotates in the opening direction indicated by the arrow B2 in FIG. 8 by the energy accumulated in the spiral spring 50. Then, the rotation of the winding shaft 50A in the opening direction is transmitted to the power generation shaft 70A, which is the rotating shaft of the generator 70, via the power transmission mechanism 60 for power generation, and the generator 70 is driven.

[0047] In addition to the fourth gear GA4 that receives the rotation transmitted from the input shaft 30A via the power transmission mechanism 40 for winding on the winding shaft 50A of the spiral spring 50, a fifth gear GA5 that transmits the rotation of the winding shaft 50A to the power transmission mechanism 60 for power generation is provided.

[0048] The fifth gear GA5 has a larger diameter and more teeth than the fourth gear GA4. For this reason, the fifth gear GA5 functions as a speed increasing gear that increases the rotation speed of the winding shaft 50A and transmits it to the power transmission mechanism 60 for power generation.

[0049] In addition, the fourth gear GA4 and the fifth gear GA5 provided on the winding shaft 50A are configured to idle with respect to the winding shaft 50A when the winding amount of the spiral spring 50 due to the rotation of the winding shaft 50A reaches the maximum. Specifically, a well-known clutch mechanism 52 is provided in the fifth gear GA5 (see FIGS. 7 and 8), and the fourth gear GA4 and the fifth gear GA5 function as so-called torque gears. As a result, after the winding of the spiral spring 50 is completed, it is possible to suppress the winding shaft 50A from rotating further and damaging the spiral spring 50.

[0050] Next, the power transmission mechanism 60 for power generation includes a first speed increasing gear 62, a second speed increasing gear 64, and a tenth gear GA10 that meshes with the second speed increasing gear 64 and transmits the rotation of the second speed increasing gear 64 to the power generation shaft 70A of the generator 70. Note that an eleventh gear GA11 that meshes with and rotates with the tenth gear GA10 is fixed to the power generation shaft 70A of the generator 70.

[0051] The first speed increasing gear 62 includes a sixth gear GA6 that meshes with a fifth gear GA5 provided on the winding shaft 50A of the spiral spring 50, and a seventh gear GA7 that is fixed to the same rotation shaft 62A as the sixth gear GA6, has a larger diameter than the sixth gear GA6, and has a larger number of teeth.

[0052] Also, the second speed increasing gear 64 includes an eighth gear GA8 that meshes with the seventh gear GA7 of the first speed increasing gear 64, and a ninth gear GA9 that is fixed to the same rotation shaft 64A as the eighth gear GA8, has a larger diameter than the eighth gear GA8, and has a larger number of teeth. Note that the eighth gear GA8 has a smaller diameter and a smaller number of teeth than the seventh gear GA7.

[0053] As a result, the rotation of the winding shaft 50A of the spiral spring 50 in the opening direction is sequentially speeded up and transmitted to the eleventh gear GA11 via the first speed increasing gear 62 and the second speed increasing gear 64, and the rotation shaft 70A of the generator 70 rotates at a higher speed than the rotation of the winding shaft 50A.

[0054] Therefore, according to the door power generation device 2 of the present embodiment, the generator 70 can be rotated at a high speed to improve the power generation efficiency. Also, the power generation amount by the generator 70 can be adjusted by changing the gear ratio between the gears constituting the power transmission mechanism 60 for power generation.

[0055] By the way, in the power transmission mechanism 60 for power generation, if all the gears are meshed so that the rotation of the winding shaft 50A of the spiral spring 50 is constantly transmitted to the power generation shaft 70A of the generator 70, the generator 70 will be driven even when the winding shaft 50A rotates in the winding direction.

[0056] Therefore, in the present embodiment, in the second plate 24 that supports the first speed increasing gear 62 from above and meshes the sixth gear GA6 with the fifth gear GA5 of the spiral spring 50, a support hole 24C through which the rotation shaft 62A of the first speed increasing gear 62 is inserted is formed as a long hole.

[0057] That is, as shown in FIG. 8, when the winding shaft 50A of the spiral spring 50 rotates in the direction of arrow B2 which is the opening direction, the support hole 24C is configured such that the rotation shaft 62A of the first speed increasing gear 62 moves toward the second speed increasing gear 64 side.

[0058] For this reason, when the winding shaft 50A of the spiral spring 50 rotates in the direction of arrow B2, the seventh gear GA7 meshes with the eighth gear GA8, and the rotation of the winding shaft 50A is transmitted to the second speed increasing gear 64.

[0059] On the other hand, when the winding shaft 50A of the spiral spring 50 rotates in the winding direction of arrow A2, as shown in FIG. 7, the rotation shaft 62A of the first speed increasing gear 62 moves in a direction away from the second speed increasing gear 64. As a result, the seventh gear GA7 moves away from the eighth gear GA8, and the rotation of the winding shaft 50A is not transmitted to the second speed increasing gear 64.

[0060] Therefore, according to the door power generation device 2 of the present embodiment, when the winding shaft 50A of the spiral spring 50 rotates in the winding direction, the rotation is transmitted to the generator 70, and an increase in the load applied to the input shaft 30A during winding of the spiral spring 50 can be suppressed. Also, when the spiral spring 50 is wound, a problem that the generator 70 is driven and unnecessary generated electric power is output, resulting in a decrease in safety, can be suppressed.

[0061] Here, the tenth gear GA10 is provided when, if the rotation of the second speed increasing gear 64 directly rotates the power generation shaft 70A of the generator 70, the rotation direction of the generator 70 does not become the rotation direction for power generation, and the desired generated electric power cannot be generated from the generator 70.

[0062] That is, the tenth gear GA10 is provided to reverse the rotation direction of the second speed increasing gear 64 and transmit it to the power generation shaft 70A of the generator 70. Therefore, when the rotation direction for generating power by the generator 70 is the reverse direction from that of the present embodiment, the tenth gear GA10 may be removed, and the ninth gear GA9 of the second speed increasing gear 64 may be directly meshed with the eleventh gear GA11 of the generator 70.

[0063] [Other Embodiments] As described above, one embodiment of the present disclosure has been described. However, the present disclosure is not limited to the above-described embodiment and can be implemented with various modifications.

[0064] For example, in the above embodiment, the input shaft 30A has been described as being the rotation shaft of the closer torque spring 30. This is because the door power generation device is provided for a sliding door. Therefore, when the door power generation device is provided for a hinged door, the input shaft may be configured to rotate by the rotation of the rotation shaft of the knob or lever handle of the hinged door.

[0065] Further, since the input shaft may rotate according to the opening and closing operation of the door, the door power generation device of the present disclosure may be provided, for example, on a closer that biases the door in the closing direction to close the door when the door is opened. That is, even if the input shaft of the present disclosure is configured as a rotation shaft that rotates according to the opening and closing of the door in the closer, or a rotation shaft that rotates in conjunction with the rotation shaft, the door power generation device of the present disclosure can be realized.

[0066] Also, the number of gears in the above embodiment and the number of gears whose rotation shafts move as the door opens and closes may be set as appropriate. Moreover, multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Additionally, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of other above embodiments.

Description of Reference Numerals

[0067] 2…Door power generation device, 10…Battery holder, 12…Charging circuit board, 14…Switch, 30…Closer torque spring, 30A…Input shaft, 40…Lifting power transmission mechanism, 50…Volute spring, 50A…Lifting shaft, 70…Generator, 70A…Generator shaft.

Claims

1. A generator comprising a power generation shaft which is a rotating shaft for power generation, and configured to generate power when the power generation shaft is rotated; A spiral spring comprising a winding-up shaft which is a rotating shaft for winding-up, configured to be wound up by rotating the winding-up shaft in the winding-up direction to accumulate energy, and when the winding-up shaft is released, the winding-up shaft is configured to rotate in the release direction which is opposite to the winding-up direction by the energy; An input shaft configured to rotate in the forward or reverse direction according to the opening / closing operation of the door; A winding-up power transmission mechanism configured to transmit a rotational force to the winding-up shaft when the input shaft is rotating in the forward direction to wind up the spiral spring, and to release the winding-up shaft when the input shaft is rotating in the reverse direction; A power generation power transmission mechanism configured to transmit the rotational force of the winding-up shaft to the power generation shaft when the winding-up shaft is rotating in the release direction, and drive the generator by rotating the power generation shaft; Comprising; The winding-up power transmission mechanism and the power generation power transmission mechanism each comprise a plurality of gears meshing with each other to transmit power; At least one of the gears constituting the winding-up power transmission mechanism is arranged such that the rotation shaft moves so that the meshing with the next gear for transmitting power is disengaged when the input shaft is rotating in the reverse direction; At least one of the gears constituting the power generation power transmission mechanism is arranged such that the rotation shaft moves so that the meshing with the next gear for transmitting power is disengaged when the winding-up shaft is rotating in the winding-up direction, a power generation device for a door.

2. The power generation device for a door according to claim 1, wherein the winding-up power transmission mechanism comprises a plurality of gears whose rotation shafts move.

3. In the spiral spring, the gear of the winding-up shaft to which the rotational force is transmitted from the input shaft via the winding-up power transmission mechanism is configured to idle with respect to the winding-up shaft when the winding-up amount of the spiral spring reaches the maximum, the power generation device for a door according to claim 1 or claim 2.

4. The power generation device for a door according to any one of claims 1 to 3, wherein the power generation power transmission mechanism is configured to increase the speed of rotation from the winding-up shaft side and transmit it to the power generation shaft by the plurality of gears.

5. A battery holder to which a plurality of rechargeable batteries are detachably attached; A charging circuit that converts the output from the generator into a predetermined DC voltage and charges the plurality of rechargeable batteries mounted in the battery holder. The door power generation device according to any one of claims 1 to 4, comprising the above.

6. When a dry battery is mounted in the battery holder instead of the rechargeable battery, a switching switch is provided that cuts off the charging power supply path from the charging circuit to the battery holder and reduces the number of dry batteries output to an external electrical device from the number of rechargeable batteries. The door power generation device according to claim 5.

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