JP2004183204A - Lock pin drive structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the noise of a lock pin drive structure protruding/recessing a lock pin low. <P>SOLUTION: The lock pin drive structure is provided with a case body 1, a motor 2 installed in the case body 1, a motion converter 4 converting rotary motion transmitted from the motor 2 to linear motion, and a lock pin 5 driven to move in the linear direction by the motion converter 4, engaged with a part to be locked when it is moved in the direction protruding from the case body 1 and released from an engaging state with a locked part. An exciting sound generated in the use of an electromagnet or an impulsive sound when a moving core strikes a fixed core can be prevented. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, the lock pin is locked in a closed state by projecting the lock pin to a locked portion of the lid, for example, or the lock is released by immersing the lock pin. And a lock pin drive structure.
[0002]
[Prior art]
As this type of lock pin drive structure, for example, a structure described in Patent Document 1 below is known.
The lock pin driving structure includes a housing, a lock pin provided to be able to protrude and retract from the housing, and an electromagnet that linearly drives the lock pin so as to protrude and retract from the housing. ing.
[0003]
In the lock pin drive structure configured as described above, the fixed core is excited by supplying power to the electromagnet, and the movable core is drawn to the fixed core, whereby the lock pin is projected from the housing. ing. Further, by stopping power supply to the electromagnet, the movable iron core is moved in a direction to separate the movable iron core from the fixed iron core by a spring force, whereby the lock pin is moved so as to be immersed in the housing.
[0004]
The lock pin drive structure is installed in devices such as an electric washing machine, a clothes dryer, a dishwasher and the like, and locks the lids provided in these devices in accordance with an electric signal, and operates during operation. It is used to avoid the danger of opening the lid.
[0005]
[Patent Document 1]
JP-A-2002-66189 [0006]
[Problems to be solved by the invention]
However, in the lock pin driving structure, there is a problem that noise is loud because an excitation sound is generated by the electromagnet and an impact sound is generated each time the movable iron core hits the fixed iron core or the like.
[0007]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a lock pin driving structure capable of reducing noise.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 provides a housing, a motor provided in the housing, and a rotary motion installed in the housing and transmitted from the motor to linear motion. The motion converting means, which is driven to move in a linear direction by the motion converting means, locked in the locked portion when moved in a direction protruding from the housing, and moved in a direction of immersing in the housing. And a lock pin for releasing the locked state with the locked portion.
[0009]
According to a second aspect of the present invention, in the first aspect, the motion converting means is provided at a eccentric position of the crank plate which is rotationally driven by a rotational force transmitted from the motor. And a crank rod having one end rotatably connected to the crank pin and the other end rotatably connected to the lock pin.
[0010]
According to a third aspect of the present invention, in the second aspect of the invention, a one-way clutch is provided between the motor and the crank plate for transmitting only one-way rotation transmitted from the motor to the crank plate side. The motor is configured with a brake mechanism, and the crank plate is stopped by stopping the motor in a state where the lock pin is further slightly rotated from a position where the lock pin projects most from the housing. The lock pin is maintained in a state of being locked to the locked portion.
[0011]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the lock pin is driven to move in a direction of immersing in the housing when the lock pin is locked to the locked portion. It is characterized by having a manual knob.
[0012]
In the invention according to claims 1 to 4 configured as described above, the rotational motion of the motor is converted into linear motion by the motion converting means, and the lock pin is driven by this linear driving force. It is possible to prevent the generation of excitation noise generated when the electromagnet is used and impact noise generated when the movable iron core hits the fixed iron core or the like.
Therefore, low noise can be achieved.
[0013]
In the invention described in claim 2, since the motion converting means is constituted by the crank plate, the crank pin, and the crank rod, the position where the crank pin protrudes most from the housing, the position where it is most immersed in the housing, or When the rotation of the motor is stopped so as to be in the vicinity of each of these positions, and even if a slight error occurs in the stop position of the motor, the position where the crank pin is most protruded or the most immersed, Does not significantly deviate from a position in the vicinity of each position.
Therefore, the lock pin can be securely locked to the locked portion, and the lock of the lock pin to the locked portion can be reliably released.
[0014]
According to the third aspect of the present invention, since the motor includes the brake mechanism, the stop of the motor ensures that the crank plate is stopped at a position rotated slightly beyond the maximum projecting position of the lock pin. Thus, the lock pin can be securely locked to the locked portion.
In addition, the crank plate is stopped at a position slightly beyond the maximum projecting position of the lock pin, and only one-way rotation transmitted from the motor is transmitted to the crank plate between the motor and the crank plate. Since the one-way clutch is provided, for example, even when the power supply to the motor is disabled and the locked state of the lock pin with respect to the locked portion cannot be released, the lock pin itself is placed in the housing. It can be manually moved to release the locked state.
[0015]
According to the fourth aspect of the present invention, since the manual knob for moving the lock pin in the direction of immersion into the housing is provided, the lock pin is manually operated even when the motor cannot be energized as described above. Can be moved inward of the housing to easily release the locked state by the lock pin.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The lock pin drive structure shown in the embodiment of the present invention is used to lock or release a lid provided at a clothes input port of a fully automatic washing machine (not shown) in a closed state or to release the lock. As shown in FIG. 1, a housing 1, a motor 2 provided in the housing 1, and a gear unit 3 installed in the housing 1 and reducing the rotation speed of the motor 2, as shown in FIG. And a motion converting means 4 for converting the rotational motion transmitted via the gear unit 3 into a linear reciprocating motion. The motion converting means 4 reciprocates in a linear direction and moves in a direction protruding from the housing 1. And a lock pin 5 that is locked to a locked portion of a lid (not shown), moves in a direction of immersion in the housing 1, and releases the locked state with the locked portion.
[0017]
As shown in FIGS. 1, 5 and 6, the housing 1 is formed in a rectangular container shape by a bottom surface 1a and four side surfaces 1b, and the motor 2 is fixed to an outer surface of the bottom plate 1a. It has become. Further, a guide hole 1c for guiding the lock pin 5 slidably in the axial direction is formed in one side surface portion 1b. The guide hole 1c is formed by a circular hole. The upper opening of the housing 1 is closed by the lid 11.
[0018]
The motor 2 has a brake mechanism using detent torque.
The gear unit 3 includes a first gear 31, a second gear 32, a third gear 33, and a fourth gear 34.
[0019]
As shown in FIG. 1, the first row gear 31 is constituted by a small gear 31a fixed to the output shaft 2a of the motor 2.
The second row gear 32 is formed by integrally forming a large gear 32a meshing with the small gear 31a, a small gear 32b smaller in diameter than the large gear 32a, and a rotating shaft 32c coaxially.
The third row gear 33 is formed by integrally forming a large gear 33a meshing with the small gear 32b, a small gear 33b smaller in diameter than the large gear 33a, and a rotating shaft 33c.
The fourth row gear 34 is formed by integrally forming a large gear 34a meshing with the small gear 33b and a rotary shaft 34b coaxially.
[0020]
A one-way clutch 6 that transmits only rotation in one direction A (see FIG. 2) to a crank plate 41 described later is coaxially provided on the rotation shaft 34 b of the fourth row gear 34.
In FIG. 1, reference numeral 35 denotes a bearing that rotatably supports the rotating shafts 32c, 33c, and 34b.
[0021]
The motion converting means 4 includes a crank plate 41 which is rotationally driven by a rotational force transmitted from the motor 2 via the gear unit 3, a crank pin 42 provided at an eccentric position of the crank plate 41, A crank rod 43 is rotatably connected to the crank pin 42 and the other end is rotatably connected to the lock pin 5.
[0022]
As shown in FIG. 2, the crank plate 41 is formed in a disk shape, and is coaxially connected to the rotation shaft 34 b of the fourth row gear 34. As shown in FIGS. 1 and 2, the crank plate 41 is arranged so that the rotation center line C1 is orthogonal to the center line C2 of the guide hole 1c and is located on the center line C2.
[0023]
The crank pin 42 is provided on the surface of the crank plate 41 opposite to the side on which the rotating shaft 34b extends, and the direction of the axis is formed parallel to the center line C1.
[0024]
The lock pin 5 has a base section 5a formed in a square cross section, and a slide section 5b having a circular section in which the base section 5a is slidably fitted to the guide hole 1c from the base section 5a. Further, a second crank pin 51 rotatably fitted to the other end of the crank rod 43 is provided on one side surface of the base end portion 5 a of the lock pin 5. The second crankpin 51 is formed such that its axis is parallel to the axis of the crankpin 42.
[0025]
As shown in FIG. 2, a contact operating projection 41a projecting in a semicircular shape is provided on the outer peripheral surface of the crank plate 41. Further, a switch 7 is provided at a position where the switch 7 comes into sliding contact with the outer peripheral surface of the crank plate 41.
[0026]
As shown in FIGS. 3 and 4, the switch 7 has a movable contact piece 7a arranged to be in sliding contact with the outer peripheral surface of the crank plate 41, and a fixed member provided in parallel with a position close to the movable contact piece 7a. The movable contact piece 7a is pressed by the contact operating projection 41a that moves with the rotation of the crank plate 41, and the contact is turned on when the movable contact piece 7a comes into contact with the fixed contact piece 7b. It is in a state. The switch 7 is installed at a position on the outer peripheral surface of the crank plate 41 corresponding to a bottom dead center, which is a position 180 degrees in a circumferential direction from a top dead center described later.
[0027]
As shown in FIG. 4, the contact operating protrusion 41 a is, assuming that a position (see FIG. 3) where the lock pin 5 most protrudes from the side surface 1 b of the housing 1 due to the rotation of the crank plate 41 is a position of the top dead center. The switch 7 is turned on at a position where the crank plate 41 rotates slightly beyond the top dead center (in this embodiment, the position of the angle θ2 at which the crank pin 42 becomes 10 to 45 degrees from the top dead center position). For this purpose, it is provided on the crank plate 41. For this reason, as shown in FIG. 2, the contact operating projection 41 a is, when the crank pin 42 is located at the bottom dead center, the top dead center because the switch 7 is installed at the position corresponding to the bottom dead center. It is provided at a position shifted by an angle θ1 in a direction opposite to one direction A in which the rotation of the crank plate 41 is allowed from the point.
[0028]
Further, the motor 2 stops when the supply of electricity is cut off by control means (not shown) based on the ON signal of the switch 7, and holds the crank pin 42 at a position of an angle θ2 from the top dead center. I have. This ensures that the lock pin 5 protrudes from the side surface portion 1b, and that the lock pin 5 can be maintained in this state.
[0029]
Further, for example, in the case of a dehydration operation, the control means closes the clothes input port with a lid, detects this closed signal, drives the motor 2 and receives an ON signal from the switch 7. After that, the power supply to the motor 2 is stopped, the lock pin 5 is held at the position corresponding to the angle θ2, and the locked portion of the lid is locked with the lock pin 5, and then the Is controlled to drive the motor. After the spin-drying is completed, by energizing the motor 2 for a predetermined time, the contact operating projection 41a is moved to the position of the angle θ1 shown in FIG. The locked state of the lid by the lock pin 5 with respect to the locked portion is released by moving to the position of the bottom dead center.
[0030]
Further, the lock pin driving structure can stop in a state where the lock pin 5 is locked to the locked portion and release the locked state only by an electric control signal from the control means. A manual knob 8 is provided for manually releasing the lock in the event that it becomes impossible.
Although not shown, the manual knob 8 is formed integrally with the lock pin 5, and its distal end projects outside through an elongated hole formed in the lid 11 of the housing 1. By moving the lock pin 5 to the bottom dead center side, the lock pin 5 is directly moved to the bottom dead center side.
[0031]
In the lock pin driving structure configured as described above, the rotational motion of the motor 2 is converted into a linear reciprocating motion via the motion converting means 4 and the lock pin 5 is driven in a linear direction. Can be prevented from being generated when the movable iron core is brought into contact with the fixed iron core or the like.
Therefore, low noise can be achieved.
[0032]
Further, since the motion converting means 4 is constituted by the crank plate 41, the crank pin 42, and the crank rod 43, when the lock pin 5 is stopped at the top dead center position or the bottom dead center position or in the vicinity thereof, Even if a certain error occurs in the stop position of the motor 2, the error of the position at which the lock pin 5 stops at the top dead center, the bottom dead center, or in the vicinity thereof (for example, the range of the angle θ from the top dead center). It can be extremely small.
Therefore, when the locked portion is to be locked by the lock pin 5, the locked portion can be securely locked, and when the locking is to be released, the release can be reliably performed. .
[0033]
Further, since the motor 2 has a brake mechanism, the stop of the motor 2 surely stops the lock pin 5 at a position slightly above the above-mentioned top dead center (position of angle θ2) or at a bottom dead center position. it can. Therefore, from this point as well, the locking of the locked portion by the lock pin 5 and the release of the locking can be reliably performed.
[0034]
In addition, the crank plate 41 is stopped at a position slightly above the maximum projecting position of the lock pin 5 (position of the angle θ2), and is transmitted from the motor 2 to the space between the motor 2 and the crank plate 41. Since the one-way clutch 6 for transmitting only the rotation in the one direction A to the crank plate 41 is provided, for example, the power supply to the motor 2 is disabled, and the lock pin 5 for the locked portion is only provided by the power supply to the motor 2. Even if it becomes impossible to release the locked state, the locked state can be released by manually moving the lock pin 5 to the bottom dead center side.
[0035]
In this embodiment, since the manual knob 8 is provided, the lock pin 5 can be easily moved to the bottom dead center side only by moving the manual knob 8 to the bottom dead center side.
[0036]
In the above-described embodiment, the lock pin 5 is driven in the linear direction by converting the rotational motion of the motor 2 into a linear motion via the motion converting means 4. However, as the motion converting means, As shown in FIG. 7, a lock pin 9 which is provided with a pinion 9 a to which the rotational force of the motor 2 is transmitted and a rack 9 b meshing with the pinion 9 a is formed integrally with the rack 9 b. It may be driven to move in a linear direction. In this case, the lock pin 9 can be reciprocated linearly by rotating the motor 2 forward or backward.
Then, by detecting, for example, a limit switch that the lock pin 9 has sufficiently protruded from the side surface portion 1b, and stopping the rotation of the motor 2, the lock pin 9 can be locked to the locked portion of the lid. . Further, the second limit switch detects that the lock pin 9 has sufficiently sunk into the housing 1 from the side surface portion 1b, and stops the rotation of the motor 2 so that the lock pin 9 is locked with respect to the locked portion. The locked state can be released.
[0037]
Further, in the above-described embodiment, an example in which the lock pin drive structure is applied to a fully automatic washing machine has been described, but the lock pin drive structure may be applied to various other devices such as a clothes dryer and a dishwasher.
[0038]
【The invention's effect】
As described above, according to the first to fourth aspects of the present invention, since the motor is used, it is possible to prevent the generation of the excitation sound by the electromagnet and the generation of the impact sound when the movable iron core hits the fixed iron core or the like. Can be. Therefore, low noise can be achieved.
[0039]
According to the invention described in claim 2, since the motion converting means is constituted by the crank plate, the crank pin, and the crank rod, the position where the crank pin protrudes most from the housing, the position where the crank pin is most immersed in the housing, or When the rotation of the motor is stopped so as to be in the vicinity of each of these positions, and even if a slight error occurs in the stop position of the motor, the position where the crank pin is most protruded or the most immersed, Does not significantly deviate from a position in the vicinity of each position.
Therefore, the lock pin can be securely locked to the locked portion, and the lock of the lock pin to the locked portion can be reliably released.
[0040]
According to the third aspect of the present invention, since the motor is provided with the brake mechanism, the stop of the motor surely stops the crank plate at a position rotated slightly beyond the maximum projecting position of the lock pin. Accordingly, the lock pin can be securely locked to the locked portion.
In addition, the crank plate is stopped at a position slightly beyond the maximum projecting position of the lock pin, and only one-way rotation transmitted from the motor is transmitted to the crank plate between the motor and the crank plate. Since the one-way clutch is provided, for example, even when the power supply to the motor is disabled and the locked state of the lock pin with respect to the locked portion cannot be released, the lock pin itself is placed in the housing. It can be manually moved to release the locked state.
[0041]
According to the fourth aspect of the present invention, since the manual knob for moving the lock pin in the direction of immersion in the housing is provided, the lock is manually performed even when the motor cannot be energized as described above. By moving the pin to the inside of the housing, the locked state by the lock pin can be easily released.
[Brief description of the drawings]
FIG. 1 is a sectional view of a lock pin driving structure shown as an embodiment of the present invention.
FIG. 2 is a view showing the inside of the lock pin driving structure, and is a cross-sectional view of a main part along line II-II in FIG. 1;
FIG. 3 is a sectional view taken along the line II-II of FIG. 1, showing an operation of the lock pin driving structure, and showing a state immediately before a contact of a switch is turned on.
FIG. 4 is a sectional view taken along the line II-II of FIG. 1, showing the operation of the lock pin driving structure, showing a state in which the lock pin is locked to the locked portion.
FIG. 5 is a front view showing the appearance of the lock pin drive structure.
FIG. 6 is a plan view showing the appearance of the lock pin driving structure.
FIG. 7 is an explanatory view showing a pinion, a rack and a lock pin having this rack shown as another example for the motion conversion means and the lock pin shown in the lock pin drive structure.
[Explanation of symbols]
Reference Signs List 1 housing 2 motor 4 motion conversion means 5 lock pin 6 one-way clutch 8 manual knob 41 crank plate 42 crank pin 43 crank rod A one direction

Claims (4)

A housing, a motor provided in the housing, a motion conversion unit installed in the housing, for converting a rotational motion transmitted from the motor into a linear motion, and moving in a linear direction by the motion conversion unit. A lock pin that is driven to lock the locked portion when moved in the direction protruding from the housing, and releases the locked state with the locked portion when moved in the direction of immersion in the housing. A lock pin drive structure comprising: The motion conversion means includes a crank plate that is rotationally driven by a rotational force transmitted from the motor, a crank pin provided at an eccentric position of the crank plate, and one end rotatably connected to the crank pin. The lock pin driving structure according to claim 1, wherein an end portion includes a crank rod rotatably connected to the lock pin. Between the motor and the crank plate, there is provided a one-way clutch that transmits only one-directional rotation transmitted from the motor to the crank plate side,
The motor is configured with a brake mechanism,
The crank plate is stopped by stopping the motor in a state where the lock pin is further slightly rotated from a position where the lock pin protrudes most from the housing, so as to maintain the lock pin in a locked state with the locked portion. The lock pin drive structure according to claim 2, wherein The lock according to claim 3, further comprising a manual knob that is driven to move the lock pin in a direction of immersion in the housing when the lock pin is locked to the locked portion. Pin drive structure.

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