JPS6235005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, in which a lamp wick is raised by rotating a wick lifting and lowering rotation shaft by an electric motor,
This invention relates to a clutch that transmits the driving force of an electric motor to the rotating shaft in a wick up-and-down mechanism that reverses the rotating shaft using a spring force stored when the wick is raised and lowers the wick.

In a liquid fuel combustion device with an upper and lower wick, the rotating shaft is first rotated by an electric motor to raise the wick, and when the wick is raised, the spring force stored in the wick is used to rotate the rotating shaft and lower the wick. , a clutch mounting plate having a clutch pivotably mounted thereon which is engaged with a clutch cam fixed to a rotating shaft is rotatably provided on the same axis as the rotating shaft, and a clutch operating member provided on the same axis as the rotating shaft, and a clutch operating member provided on the same axis as the rotating shaft; A structure was proposed in which the clutch cam could be engaged and disengaged using a spring piece provided on the member (patent application 1983-
No. 125452). In this configuration, when the lamp wick has risen to a predetermined position, the rotating shaft is rotated by a predetermined amount by the spring, and at this time, the clutch is pressed by the spring piece and rotates, so that the clutch does not come off from the clutch cam. However, at this time, the spring piece reaches a position on the outer periphery of the clutch beyond the shaft attachment part where the clutch rotates, and a force is applied to the clutch in the opposite direction to the direction of rotation, which may prevent the clutch from coming off the clutch cam. .

The present invention has been made in view of the above points, and is located on the opposite side of the engagement part formed on the inner periphery of the clutch around the shaft attachment part of the clutch, and engages with the outer periphery of the spring piece that causes the clutch to reversely rotate. The engagement edge with an engagement step is formed with a notch, so that the spring piece is surely engaged with the clutch, and the spring piece does not engage the clutch to a position beyond the pivot point of the clutch, so that there is some assembly error. To provide a liquid fuel combustion device in which a clutch can be reliably disengaged even if a clutch occurs.

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings.

Reference numeral 1 denotes a fuel tank fixed on a base 2. This fuel tank 1 is formed with a cylindrical wick guide part 3 that opens downward, and a lamp wick 4 is fitted into this wick guide part 3 so as to be able to rise and fall freely. ing. A burner basket 5 is located above the core guide portion 3 and attached to the fuel tank 1.
A fire pan 6 is formed at the upper part of the burner basket 5 and the wick guide part 3, and the upper end of the lamp wick 4 is moved forward and backward into the upper part of the fire pan 6. A wick holder 7 is fitted on the outer periphery of the lower part of the lamp wick 4, and rack teeth 8 are formed on the outer periphery of the wick holder 7 in a vertical or inclined manner in the vertical direction.

Next, reference numeral 9 denotes a wick lifting/lowering rotating shaft, and this rotating shaft 9 is rotatably supported by a bearing 11 attached to the fuel tank 1 with a fitting 10. This rotating shaft 9
A gear 12 meshed with the rack teeth 8 is provided at the inner end of the gear 12.
is installed. Furthermore, a ratchet body 13 is fixed to this rotating shaft 9, and this ratchet body 1
3 is wound around the rotating shaft 9, both ends of the spring 14 are respectively locked to the ratchet body 13 and the rotating shaft 9, and the rotating shaft 9 is moved around the lamp wick by the stored energy of the spring 14. 4 in the downward direction. Further, a claw piece (not shown) is detachably engaged with the rack teeth 8 of the ratchet body 13 and is disengaged by a vibration sensing device or a manual fire extinguishing device.

Further, a cylindrical collar portion 15 is provided on the outer end side of the rotating shaft 9.
The clutch cam 16 having a
is fixed to the rotating shaft 9 with a pin 17. The clutch mounting plate 1 is attached to the collar 15 of this clutch cam 16.
8 are rotatably fitted. The outer periphery of the clutch mounting plate 18 is formed into a cam edge 19, and a clutch 20 is rotatably attached to an eccentric position on the side surface of the clutch mounting plate 18 adjacent to the clutch cam 16 with a caulking pin 21. There is.

Further, a meshing portion 22 that meshes with the clutch cam 16 is formed inside the clutch 20, and a meshing portion 22 that meshes with the clutch cam 16 is formed on the outer periphery, which is curved in a convex arc shape, and is located on the opposite side, which is approximately point symmetrical to the meshing portion 22 with the pin 21 as the center. An engagement edge 24 having an engagement step 23 is formed with a cutout.

Further, the collar portion 15 of the clutch cam 16 has a first
A ring 26 of a driven gear 25 is rotatably fitted therein, and the ring 26 is fixed to the clutch mounting plate 18.

Further, a second driven gear 27 is rotatably fitted into the ring portion 26 of the first driven gear 25 and is held between the first driven gear 25 and the clutch mounting plate 18. A clutch operating member 28 is integrally formed on the side surface of the second driven gear 27 adjacent to the clutch mounting plate 18. This clutch actuating member 28 is formed with an annular clutch actuating edge 29 extending on the outer peripheral side movement locus of the clutch 20 over the entire inner circumference.
Reference numeral 9 includes a pressing portion 30 for engaging and disengaging the clutch 20 from the clutch cam 16, and a releasing portion 31 whose diameter is enlarged from the pressing portion 30. Further, an insertion portion 32 that opens to the outer peripheral surface of the clutch actuating member 28 is formed at the end of the pressing portion 30 of the clutch actuating edge 29.

Reference numeral 33 denotes a spring piece formed from a leaf spring, the proximal end of which is fixed to the outer peripheral side of the clutch actuating member 28 with a rivet 34, and the tip of this spring piece 33 is bent at a substantially right angle, and 2
The clutch actuating edge 29 projects from the insertion portion 32 of the clutch 8 and is regulated by the cam edge 19 of the clutch mounting plate 18 so as to come into elastic contact with the outer peripheral surface of the clutch 20.

Further, 35 is a gear electric motor, which is attached to the fuel tank 1 via a mounting base 36, and this electric motor 35
An output shaft 37, which is rotated via a gear meshing mechanism (not shown), is mounted on the mounting base 36. This output shaft 37 has first and second driven gears meshed with the first and second driven gears 25 and 27, respectively.
Output gears 38 and 39 are provided. The first output gear 38 and the first driven gear 25 are 1
The second output gear 39 and the second driven gear 27 are meshed with each other at a gear ratio of 1:2.

Note that a first output gear 3 is provided at the outer end of the rotating shaft 9.
8, the first driven gear 25 and the second output gear 3
9 and the second driven gear 27 are supported by a support 40 that maintains the meshing positional relationship between the gear 9 and the second driven gear 27.

Next, the operation of this embodiment will be explained.

When a switch (not shown) is closed, the electric motor 35 is driven and the output shaft 37 rotates, and the rotation of the output shaft 37 causes the first and second driven gears to mesh with the first and second output gears 38 and 39, respectively. 25, 27
is rotated. The clutch mounting plate 18 and the clutch operating member 28 are rotated by the rotation of the first and second driven gears 25 and 27. In this state, the outer peripheral surface of the clutch 20 is rotated by the clutch operating member 28.
The clutch 20 is located at the release part 31 of the clutch 20.
The meshing portion 22 is disengaged from the clutch cam 16, and the rotating shaft 9 is not rotated. and the first
The clutch mounting plate 18 that is interlocked with the first driven gear 25 is determined based on the relationship between the gear ratio between the output gear 38 and the first driven gear 25 and the gear ratio between the second output gear 39 and the second driven gear 27. When the clutch 20 pivotally connected to the clutch rotates twice, the clutch operating member 28, which rotates integrally with the second driven gear 27, rotates once.
As shown in the figure, the pressing portion 30 of the clutch operating edge 29
The clutch 20 is rotated around the pin 21 while being guided by the end of the clutch 20, the meshing part 22 of the clutch 20 is engaged with the clutch cam 16, the rotating shaft 9 starts rotating, and the gear 12 of the rotating shaft 9 and the core Holder 7
The core holder 7 is raised by meshing with the lock teeth 8,
The wick 4 begins to rise. As shown in FIG. 5, when the clutch 20 rotates over 0.5 rotation, the tip of the spring piece 33 is pushed outward by the cam edge 19 of the clutch mounting plate 18.

Further, a control section (not shown) detects the time from when the lamp wick 4 starts rising until the lamp wick 4 advances a predetermined amount into the fire pan 6. The number of rotations of the rotating shaft 9 until the electric motor 35 stops is set to approximately 1.5 times or more due to the relationship between the gear 12 and the lock teeth 8 of the core holder 7.
As shown in FIG. 4, the clutch 20 has been rotated by 0.5 rotation until it engages with the clutch cam 16, so the electric motor 35 is stopped when the clutch 20 has made two rotations from the start of rotation, and the clutch mounting plate 18 and the clutch actuating member 28 are is about to be stopped. Before the electric motor 35 stops, the tip of the spring piece 33, which is engaged with the cam edge 19 of the clutch mounting plate 18, drops from the engagement step 23 of the clutch 20 to the engagement edge 24, as shown in FIG. I'm here. When the electric motor 35 stops, the rotating shaft 9 is rotated by a predetermined angle in the return direction by the stored force of the spring 14.
The clutch cam 16 pushes the engagement portion 22 of the clutch 20, and the spring piece 3 is moved from the engagement step 23 to the engagement edge 24.
3 is engaged, the clutch actuating member 28
The clutch 20, which is located at the release part 31 of the clutch operating edge 29, rotates about the pin 21,
The engaging portion 22 of the clutch 20 is disengaged from the clutch cam 16, and this state is maintained by the urging force of the spring piece 33. Then, a pawl piece (not shown) engages with the ratchet body 13, and the rotating shaft 9 is stopped. The upper end of the lamp wick 4 is held in a state where it extends into the fire pan 6.

In addition, when the claw is removed from the ratchet body 13 at the time of extinguishing the fire, the rotating shaft 9 is rotated by the spring 14 which was stored when the lamp wick 4 was raised. At this time, since the clutch 20 is separated from the clutch cam 16, the rotating shaft 9 rotates until the wick 4 is lowered to a predetermined position, and the lamp is extinguished.

According to the present invention, the clutch is driven by an electric motor to engage the clutch cam and rotate the rotating shaft that raises and lowers the lamp wick, thereby raising the lamp wick, and when the lamp wick is raised, the spring stored in force rotates the rotating shaft. In a liquid fuel combustion device in which the wick is lowered,
When the wick is raised, the clutch is engaged with the clutch cam by the pressing part of the clutch actuating member, and when the wick is raised, the clutch is released from the clutch cam by the releasing part of the clutch actuating member and the spring piece. The pieces are regulated by the cam edge of the clutch mounting plate, and on the outer periphery on which the tip of the spring piece of the clutch slides, there is an engagement edge with a step located on the opposite side of the engagement part around the pin that pivotally supports the clutch. Because of this, the spring piece will not come off from the clutch, and even if there is some assembly error during assembly, the spring piece will surely engage the clutch, and the spring piece will not move beyond the position where it is pivoted by the pin of the clutch. The clutch engagement can be reliably released at a position approximately symmetrical to the engagement part with the clutch cam with the pin as the center without engaging and continuing engagement with the clutch cam. In addition, the number of structural members is not increased, ease of assembly is improved, and quality can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a part of a liquid fuel combustion device showing one embodiment of the present invention, FIG. 2 is a front view of the same, and FIG.
This figure is a longitudinal sectional view of the same as the above, and FIGS. 4 to 7 are rear views showing the operation stroke of the clutch mechanism. 4... Lamp wick, 9... Lamp wick lifting/lowering rotation shaft, 14... Spring, 16... Clutch cam, 18... Clutch mounting plate, 19... Cam edge, 20... Clutch, 21... Pin, 22... Engaging portion, 23... Engagement step, 24 ... Engaging edge, 25... First driven gear, 27... Second driven gear, 28... Clutch operating member, 29... Clutch operating edge, 30... Pressing part, 31... Release part, 33... Spring piece, 35... Electric motor, 38...first output gear, 39
...Second output gear.

Claims (1)

[Claims] 1. A lamp wick lifting and lowering shaft which is rotated by an electric motor in a direction to raise the lamp wick and which is rotated in a direction to lower the lamp wick by a spring force stored when the lamp wick is raised, and a clutch cam fixed to this rotation shaft;
A clutch mounting plate is rotatably provided adjacent to the clutch cam on the same axis as the rotating shaft and forms a cam edge; a clutch having a removably engaged meshing portion formed on its inner circumferential side; and a first output rotatably provided coaxially with the rotating shaft, coupled to the clutch mounting plate, and rotated by the electric motor. a first driven gear meshed with the gear, and a second driven gear rotatably provided coaxially with the rotating shaft and rotated by the electric motor.
a second driven gear meshed with the output gear; a pressing portion provided integrally with the second driven gear and extending on a movement locus on the outer peripheral side of the clutch for causing the clutch to mesh with the clutch cam; a clutch operating member having a clutch operating edge forming a release portion for disengaging the clutch cam; and a clutch mounting plate fixed to the clutch operating member and having a tip protruding from the end of the pressing portion inward of the clutch operating edge. A spring piece is provided that is regulated by the cam edge and engages the outer periphery of the clutch to disengage the clutch and the clutch cam, and a pin that pivotally supports the clutch is provided on the outer periphery on which the tip of the spring piece of the clutch slides. A liquid fuel combustion device characterized in that a notch is formed in an engagement edge having an engagement step located on the opposite side of the engagement portion at the center.