JPH07184517A - Motor-driven reel for fishing - Google Patents

Abstract

PURPOSE:To provide a motor-driven fishing reel provided with a clutch mechanism to switch a line-winding spool between a winding mode and a free mode and capable of quickly and easily performing the switching operation of the clutch mechanism and the speed-changing operation in winding. CONSTITUTION:This motor-driven fishing reel is provided with a spool rotatably supported on a reel main body, a motor for driving the spool, a motor output regulating member, a clutch mechanism and an actuator. The motor output regulating member 300 is provided with a motor output regulation part 301 and a power transmission switching part 303. The motor output regulation part and the power transmission switching part are made to be separately operable with a single mechanism 305.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fishing reel provided with a clutch mechanism for switching a spool between a winding state and a free state, which is improved so that the clutch mechanism can be switched and the winding speed change operation can be performed quickly. For electric reels.

[0002]

2. Description of the Related Art An electric reel for fishing, which has a spool drive motor for rotating a spool of a fishing reel, which is variably controlled for energizing time of a drive power source to improve operability for winding a fishing line, is disclosed in Japanese Patent Application Laid-Open No. HEI 5- It is described in Japanese Patent No. 153888 and is publicly known.

Further, in a clutch mechanism having an actuator for switching a spool between a winding state and a free state, a motor output adjusting body for increasing / decreasing a motor output in multiple stages is displaceably provided on a reel body. -168379
It is described in Japanese Patent Publication No.

The conventional technique will be described in detail with reference to the drawings. FIG. 7 is a plan view of the electric fishing reel described in Japanese Patent Laid-Open No. 5-168379. In the figure, 1 is a reel body, 3 and 5 are reel side frames fixed to the left and right sides of the reel body 1, and 7 is a spool around which a fishing line 9 is wound. The spool 7 has a bracket (not shown) at one end. It is rotatably supported on the reel body 1 via the other end, and is rotatably supported on the other end by a spool gear 11 fixed to the reel body 1 and a bearing 15 of a set plate 13 attached to the reel body 1.

Reference numeral 17 is a spool drive motor (hereinafter referred to as "motor") arranged in the spool 7 with their axes aligned.
Then, between the rotary shaft 17a of the motor 17 and the spool 7,
The reduction gear mechanism 19 provided in the spool 7 is connected to each other so that the rotation of the motor 17 can be transmitted to the spool 7. Further, the boss portion 21a of the gear carrier 21 that constitutes the reduction gear mechanism 19 is relatively rotatably fitted in the boss 11a of the spool gear 11 that supports the spool 7.

Reference numeral 23 denotes a spool winding manual handle, which is also connected to an outer protruding end of the reel side frame 5 of a handle shaft 25 rotatably mounted on the set plate 13. Then, a spool reverse rotation preventing claw wheel 27 as shown in FIG. 9 is fixed to the handle shaft 25 in the reel side frame 5, and a drive gear 29 is rotatably attached. Further, the drive gear 29 and the handle shaft 25 are frictionally coupled by a drag device 31 set on the handle shaft 25, whereby the manual handle 2
The rotation of 3 can be transmitted to the drive gear 29. In addition, as shown in FIG.
A locking claw 33 biased by a spring (not shown) is in contact with the locking claw 33, and the locking claw 33 is pivotally attached to the side plate 5 by a pin 35.

In the figure, 79 is the drive gear 2
9 is a pinion gear that meshes with the pinion gear 79. The pinion gear 79 is rotatable on the axis of the spool 7 between the center of the boss portion 21a of the gear carrier 21 and the reel side frame 5 and is supported by the pinion shaft 81 in a horizontal state. A clutch plate 39, which is supported so as to be movable in the axial direction, is provided between the pinion gear 79 and the boss portion 21a of the gear carrier 21 that faces the pinion gear 79, which transmits or blocks the winding power from the motor 17 to the spool 7. There is.

In addition to the above-described structure, the electric fishing reel has a motor output adjusting lever (hereinafter referred to as "lever") 93 as a motor output adjusting member in front of the right side surface of the reel unit 1. The rotary potentiometer 95 is connected to the lever 93 as an output adjusting means of the motor 17 while being rotatably mounted in a range of about 120 °, and the output of the motor 17 is maximized from the off state by rotating the lever 93. The value is continuously increased or decreased.

That is, as is well known, the potentiometer 9
Reference numeral 5 is to extract the voltage corresponding to the position of the brush by moving the brush with a given mechanical displacement, sliding the brush over a fixed resistor, and changing the resistance value. Therefore, in this example, the lever 93 is connected to the potentiometer 95, and the position of the brush in the potentiometer 95 is changed by the displacement operation of the lever 39. Then, as shown in FIG.
The change in the resistance value of the potentiometer 95 due to the operation of the control circuit 43 is input to the control circuit 43, and the duty ratio of the drive power supply to the motor 17 is set as the duty ratio of the pulse signal according to the operation amount (displacement amount) of the lever 93. By variably controlling the rotation of the motor 17, the rotation of the motor 17 can be controlled in multiple stages (0 to 100%).

When the ON / OFF switch 51 is turned ON when the fish hits the lever 9,
Since the spool 7 is rotated by the motor output at the current position of 3 to wind up the fishing line 9, the angler can check the display device 105 and slowly wind up the fishing line 9, for example, a bar display on the display device 55. Operate the lever 93 so that the scale of the amount is “20”, and if the fish is pulled strongly and the Harris is strong, operate the lever 93 so that the scale of the bar display amount is “80”. If the output of the motor 17 is controlled by operating the lever 93 in accordance with the above condition, the fishing line 9 will be wound at the optimum motor speed for winding. Then, when it is desired to stop the winding, the lever 93 may be returned so that the bar display amount scale becomes "0".

FIG. 9 shows a side view of the clutch mechanism. In the figure, 37 is a clutch operating plate for operating a clutch plate 39 which will be described later.
7 is formed longer than the lower part of the reel body 1 as compared with the clutch operating plate f of FIG. A long hole 41 through which the handle shaft 25 is inserted is formed at the center of the clutch actuating plate 37.
Two cams 43 are provided on both sides of 1. Incidentally, FIG.
Reference numeral 45 denotes a guide member for the clutch operating plate 37.

As shown in FIG. 9, a clutch operating motor (hereinafter referred to as "clutch motor") 47 is mounted between the side plates 3 and 5 at the lower front of the reel unit 1 and drives the clutch motor 47. Clutch operating plate 37
Move in the directions of arrows A and B to turn the clutch ON / OF.
It is supposed to be F.

That is, as shown in FIG. 11, a speed reducer 49 is attached to the clutch motor 47, and a pin 53 attached to a lever 51 of the speed reducer 49 is provided on the rear end side of the clutch operating plate 37. The hole 55 is engaged.
The clutch motor 47 is driven by operating a motor drive switch 59 provided on the operation panel 57. The push operation of the motor drive switch 59 causes the clutch motor 47 to rotate and the lever 51 to move to the position shown in FIG. As shown in FIG. 12, the clutch operating plate 37 moves in the direction of arrow A as shown in FIG.
It is designed to be FF.

A magnet 61 is mounted on one side edge of the clutch operating plate 37, and the reed switch 63 is turned on / off by the magnet 61.
65 is arranged in the guide member 45 corresponding to ON / OFF of the clutch.

Then, as shown in FIG. 9, the clutch motor 4 is operated by pushing the motor drive switch 59.
When the clutch operating plate 37 moves in the direction of arrow B by the rotation of 7 in the direction of arrow D and the clutch is turned on, the reed switch 63 is turned on by the magnet 61, and the signal is input from the control device 67 described later. The clutch motor 47 is stopped by this command. Similarly, as shown in FIG. 9, when the clutch motor 47 moves in the direction of arrow C and the clutch operating plate 37 is returned to the position shown by the solid line to turn off the clutch, the reed switch 65 is turned on by the magnet 61. The clutch motor 47 is stopped by a command from the control device.

As is well known, the potentiometer 95 moves a brush with a given mechanical displacement, slides it on a fixed resistor, and changes its resistance value to take out a voltage corresponding to the position of the brush. It is a thing. Then, adjust the adjusting lever 93 to the potentiometer 9 as described above.
1 and changing the position of the brush in the potentiometer 95 by operating the adjusting lever 93.
As shown in FIG. 3, a change in the resistance value of the potentiometer 95 due to the operation of the adjusting lever 93 is input to the control device 67, and the duty ratio of the pulse signal corresponding to the operation amount (displacement amount) of the adjusting lever 93 is input to the spool motor 17. The drive power supply energization time rate is variably controlled by the control device 67, and the rotation of the spool motor 17 can be controlled in multiple stages from zero to the maximum value (0 to 100%).

Then, as shown in FIG.
As described above, the motor drive switch 59, the encoder 89, the potentiometer 95, the reed switches 63, 63, 77, the main switch 101, the ON / OFF switch 103, etc. are connected to the input side.
Further, on the output side, the digital display section 91 and the motors 17 and 4 are provided.
7 motor drive circuits 107 and 109 are respectively connected.

[0018]

In the electric fishing reel described above, when the fishing reel is actually used, the fishing line is wound, the winding is temporarily stopped, and then the water depth, the type of the fish, and the wave wind are taken. Because the fishing line is fed out and stopped due to circumstances such as the above, when repeating it, the clutch drive motor operation switch and the motor output adjustment body (output adjustment lever) are separated and placed in different positions as in the conventional case. If there was, there was a drawback that quick operation could not be performed.

Further, if these elements of the switch lever are separately provided on the reel unit, it is inevitably expensive in manufacturing. Therefore, an object of the present invention is to improve the above-mentioned drawbacks, and for a reel provided with a clutch mechanism for switching a spool for winding fishing line between a winding state and a free state, the switching of the clutch mechanism and the hoisting gear shifting operation can be performed quickly. Another object of the present invention is to provide an electric reel for fishing that can be easily performed.

[0020]

FIG. 1 is a view showing the principle configuration of the present invention, in which 7 is a spool rotatably supported by a reel unit, 17 is a spool drive motor, and 10 is a spool drive motor.
Reference numeral 0 denotes the overall clutch mechanism, reference numeral 200 denotes an actuator for the clutch mechanism, and the clutch mechanism 100
, 300 is a motor output control body as a whole, 301 is a motor output control section, 303 is a power transmission switching section, and 305 is the same mechanism for processing the output control section 301 and the power transmission switching section separately. It is an arrow that means to do.

In order to achieve the above-mentioned object, the present invention has the following constitution. That is, the spool 7 rotatably supported by the reel body, the spool drive motor 17 that rotationally drives the spool 7, and the reel body that increases and decreases the motor output of the spool drive motor 17 in multiple stages are displaceably provided. An electric motor for fishing provided with a motor output adjuster 300, a clutch mechanism 100 for transmitting or cutting off winding power to the spool 7, and an actuator 200 for switching the clutch mechanism 100 between a fishing line winding state and a fishing line feeding state. In the reel, the motor output adjuster 300 is
At least a motor output adjusting unit 301 for increasing / decreasing the motor output in multiple stages, and a power transmission switching unit 303 for switching the clutch mechanism 100 between the fishing line winding state and the fishing line feeding state by operating the actuator 200 are separately provided. , The output adjusting unit and the thrust transmission switching unit are the same mechanism 30.
It is configured such that it can be processed separately by 5.

According to a second aspect of the present invention, the motor adjuster is provided with malfunction prevention means and release means for the malfunction prevention means. According to a third aspect of the present invention, the actuator includes a solenoid coil.

According to a fourth aspect of the present invention, there is provided the malfunction prevention means and a nonreciprocal operation circuit as means for canceling the malfunction prevention means.

[0024]

According to the first aspect of the present invention, the output of the motor 17 is increased / decreased as in the conventional case by using the motor output adjusting section 301 of the motor output adjusting body 300 for the spool drive motor 17. The power transmission switching unit 303 in the motor output adjuster 300 controls the actuator 200 and switches the power transmission of the clutch mechanism 100. Therefore, power transmission from the spool drive motor 17 to the spool 7 is normally performed or cut off. That is, in fishing, the actuator 200 is controlled so that the clutch mechanism 100 is turned off when the fishing line is paid out from the spool 7, and the clutch mechanism 100 is turned on when the fishing line is wound.

In the operation of winding the fishing line on the spool 7, the fisherman manually controls the output of the motor output control unit 301 in multiple stages while taking into consideration the size of the fish, wave wind, tidal current, and the like. When the winding operation is completed and the output of the motor output adjusting section 301 is set to zero, the tackle is held at that position, but the clutch mechanism 100 needs to be turned on.

In the present invention, the output adjustment of the motor output adjustment unit 301 and the power transmission switching unit 303 of the clutch are the same mechanism 3.
Since it is configured to be processed by No. 05, the ON state of the clutch mechanism 100 does not change only by setting the output of the motor output adjusting unit 301 to zero.

Next, when it is necessary to lower the fishing line toward the bottom of the water, the clutch power transmission switching unit 303 is processed and the clutch power transmission switching unit 303 is processed to turn off the clutch mechanism 100. Good. At that time, since the processing is performed only by the "same mechanism 305" described above, no output is generated from the motor output adjusting unit 301.

According to the second aspect of the present invention, when the output of the motor output adjusting section 301 is adjusted, the motor adjusting body 300 is provided with a means for preventing the wrong operation so as not to cause the wrong operation against the intention of the fisherman. is doing. Further, it is also provided with a means for canceling the malfunction preventing means if the preventing means becomes unnecessary after the operation of the preventing means. Therefore, in this case, a processing operation contrary to the angler's intention does not occur.

According to the third aspect of the present invention, since the actuator 200 includes the solenoid, it is possible to perform a reliable operation even with a small size, as compared with using an external device such as a motor.

According to the invention described in claim 4, a circuit having a special configuration is used as the malfunction preventing means and the canceling means of the malfunctioning means. With the circuit, the fisherman reciprocates between the position where the output adjustment lever of the motor becomes zero and the position where the fisherman rotates beyond it, so that the processing device can be operated without malfunction.

[0031]

FIG. 2 is a perspective view showing an embodiment of the present invention and shows a device corresponding to the motor output adjusting section 301, the power transmission switching section 303 and the same mechanism 305 shown in FIG. In FIG. 2, 93 is an adjusting lever, 95 is a potentiometer, 401 and 403 are terminals at both ends of the potentiometer, and 405 is an intermediate terminal of the potentiometer. Four
Reference numeral 07 denotes the rotation axis of the potentiometer 95. Again 41
Reference numeral 0 denotes a single-pole single-throw switch, which is an on / off switch of the power source for the actuator of FIG. The actuator is, for example, a motor for operating the clutch.

FIG. 3 shows the rotary shaft 4 of the potentiometer of FIG.
It is operation | movement explanatory drawing, such as motor output adjustment by the adjustment lever 93 for rotating 07. That is, the potentiometer and the switch shown in FIG. 2 are attached to the back of the paper surface, and the rotary shaft 407 and the adjusting lever 93 appear on the front side of the paper surface.

The point Q in FIG. 3 is the potentiometer 9
5 shows the position where the output for rotating the spool drive motor becomes zero at the operation start point of 5. Adjustment lever 93 from point Q
When is rotated clockwise, control is performed to increase the output of the spool drive motor so that the potentiometer 95 according to the related art operates. Point P is the maximum output of the spool drive motor, and the range indicated by 415 is the operating range of the spool drive motor. Terminal 40
The electrical connection to the terminals 1, 403 and the intermediate terminal 405 is the same as the conventional one.

Next, when the adjusting lever 93 is rotated counterclockwise from the point P to the point Q, the output of the spool drive motor changes from the maximum to zero. When the adjusting lever 93 is further rotated in the counterclockwise direction, the adjusting lever abruptly moves from the point Q to the point S by applying a force slightly larger than the lever turning power up to that point. A range 417 from a point Q to a point S indicates a switch operation range as a power transmission switching unit. The power transmission is off at the point S and on at the point Q, and the lever 93 does not stop midway between the points S and Q.

Therefore, while the fisherman is fishing,
When the adjusting lever 93 is moved to the point Q at which the output of the spool drive motor becomes zero, it feels that the rotation of the adjusting lever 93 is stopped. At that time, the clutch mechanism is held in the ON state. Even if the rotation is stopped, the fishing line will not be accidentally rewound into the water. When the clutch mechanism is turned off, when a slightly larger force is applied to the adjustment lever, the position of the adjustment lever moves abruptly to the point S, the actuation of the actuator (not shown) for the clutch mechanism is lost, and the clutch mechanism is turned off. Become.

When the adjusting lever 93 is rotated, it is not always necessary to visually check the current position as shown in FIG. 3, but when operating from an oblique direction, it moves from the point P and at the point Q. At the stopping pile, it is possible to move to point S. As such a malfunction prevention means,
It is advisable to provide a protrusion having a built-in spring, which is shown as 419 in FIG. The projection 419 is provided so as to slightly project in the front direction of the drawing due to the spring.

When the protrusion 419 is pressed from the paper surface side with a fingertip or the like, it is pushed down to a horizontal position which is approximately the same as the paper surface. If the pushing force is released, the projection will project back to its original state. Therefore, normally, when the adjustment lever is rotated in the direction from the point P to the point Q, the lever abuts the protrusion 419 at the position of the point Q, and cannot rotate. If the protrusion 419 is pushed down with a fingertip or the like, the adjustment lever 93 can be rotated to the point S, and at that time, the protrusion 419 exerting a pushing force by the spring does not cause the adjustment lever 93 to rotate carelessly.
Then, when the adjusting lever 93 is rotated from the position of the point S to the position of the point Q, the projection 419 projects again to the original position.
Therefore, the protrusion 419 serves as a malfunction preventing means for the actuator, and the built-in spring serves as a releasing means for the means.

The projection 419 and the adjusting lever 93 shown in FIG. 3 can be configured as shown in FIG. That is, as shown in the cross-sectional view of FIG. 4, the protrusion 419 of FIG. 3 has a fixed size without using a spring, and the adjustment lever 93 is divided into a tip portion 93a and a base portion 93b. A recessed portion 93d provided with a spring 93c is provided on the base side of the portion 93a, and a cutout portion 93e is provided on the tip portion 93a.
Have. The notch 93e is slightly larger than the size of the protrusion 419.

At the position of the point Q shown in FIG. 3, the tip portion 93a of FIG. 4 hits the projection 419 and cannot rotate in the direction of the point S. At that time, if the tip 93a is moved toward the base 93b so as to push down the spring 93c, the notch 93e is aligned with the position of the protrusion 419, so that the adjustment lever 93 can be rotated in the direction of the point S. I can. That is, the protrusion 419 is a malfunction prevention means,
The spring 93c and the notch 93e are the releasing means.

The position of the adjusting lever 93 from the point Q to the point S may be detected by another method such as using a reed switch disclosed in Japanese Patent Laid-Open No. 5-153888. In the next embodiment, the actuator 200 shown in FIG. 1 is configured to include a solenoid coil. If the switch terminals 411 and 413 shown in FIG. 2 are inserted and connected to the power supply circuit for supplying a direct current to the solenoid coil in the prior art, the operation can be performed as described above.

Another embodiment is to use an electronic circuit as the malfunction preventing means and the canceling means. FIG. 5 shows the circuit diagram. In FIG. 5, 95 is a potentiometer, Vcc is a DC voltage source, Vr ₁ , Vr _{2 and} Vr ₃ are reference voltage source voltages (where Vr ₃ <Vr ₂ ), 421 is a differential amplifier, 4
25 and 431 are comparators, 423 is a drive circuit of the spool drive motor, 424 is an output terminal of the drive circuit 423,
427 is a relay, 428 is a contact of the relay 427, 429
Is a connection terminal to the actuator, 433 is a T-type flip-flop, and 435 is a delay-type flip-flop.

The potentiometer 95 adjusts the motor output in the range 415 up to the point Q shown in FIG. 3, but the range up to the point S outside thereof is compared with the degree of FIG. 2 and the operation as a potentiometer or the switch operation is performed. A range that is not performed is set, and in the range, the switching operation of the power transmission switching section to the clutch is performed as shown below. Therefore, the point corresponding to the point Q at one end of the range 415 shown in FIG. 3 (the point at which the output of the spool drive motor becomes zero) is set, and the voltage Vr ₁ is set as the corresponding positive DC voltage. Vr ₂ is a negative voltage and its absolute value is selected to be substantially equal to Vr ₁ . Further, Vr ₃ is an absolute value and smaller than Vr ₂ . Potentiometer 95 is Vr ₁
3 is rotated clockwise to the position indicated by the point P in FIG. 3, the output of the differential amplifier 421 outputs the drive circuit 423.
, The spool drive motor operates normally via the terminal 424.

Next, when the potentiometer 95 is rotated counterclockwise to reach the point Q, the output of the spool drive motor becomes zero, but the potentiometer can be further rotated to the point S. When the point S is reached, as shown at time t ₀ in the timing chart shown in FIG. 6, the voltage of the terminal 429 is held in the ON state (Vr _2, Vr is set to be in that state).
Select ₃ . Therefore, the clutch continues to be in the so-called ON state. Then, the potentiometer 95 is rotated clockwise to the position of the point R (time t _{1 in} FIG. 6), and is returned counterclockwise to the point S. Therefore, at time t ₂ , the delay flip-flop 435 operates, the relay 427 is demagnetized, and the contact 428 is opened, so that the clutch “OFF” is started only here.

Next, when the clutch is turned on, the potentiometer 95 can be operated when the potentiometer 95 is rotated clockwise past the point Q (time t ₃ ). In FIG. 6, the intervals t _{0 to} t ₃ are not always equal. In this way, the rotation of the potentiometer 95 is repeated clockwise and counterclockwise when the motor output is zero or below, and the clutch "off" can be executed by detecting the rotation in the counterclockwise rotation. Therefore, it is not possible to operate the clutch "off" with only a single counterclockwise rotation.
Therefore, the malfunction preventing means and the canceling means can be composed of an electronic circuit by this electronic circuit.

Further, these output control parts can be constructed as a single element at a place where it is easy to operate the reel body properly.

[0046]

As described above, according to the present invention, the clutch mechanism can be turned on and off effectively and reliably by a single mechanism by the structure of the adjusting portion and the power transmission switching portion in the output adjusting body of the spool drive motor. . Further, since the output adjusting body, for example, the adjusting lever can be configured as a single element at a place on the reel body where it is easily operated, it is easy for a fisherman to operate and no erroneous operation occurs. Of course, the cost is low when manufacturing the reel. Therefore, the invention is effective and appropriate for both manufacturers and users.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention.

FIG. 2 is a perspective view showing an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of FIG. 2;

FIG. 4 is a cross-sectional view showing another embodiment of the present invention.

FIG. 5 is an electronic circuit diagram showing another embodiment of the present invention.

FIG. 6 is a timing chart illustrating the operation of FIG.

FIG. 7 is a plan view of a reel shown as a prior art.

FIG. 8 is an explanatory diagram of a clutch in a reel shown as a conventional technique.

9 is a side view of the clutch mechanism shown in FIG.

FIG. 10 is a partial view of the clutch mechanism shown in FIG.

FIG. 11 is an operation explanatory view of the clutch mechanism shown in FIG. 9.

FIG. 12 is an operation explanatory view of the clutch mechanism shown in FIG. 9.

13 is an operation control diagram of a clutch and a motor in the reel shown in FIG.

[Explanation of symbols]

 7 Spool Main Body 17 Spool Drive Motor 100 Clutch Mechanism 200 Actuator 300 Motor Output Adjusting Body 301 Motor Output Adjusting Section 303 Power Transmission Switching Section 305 Processing Operation by Same Mechanism

Claims (4)

[Claims] 1. A spool rotatably supported on a reel body, a spool drive motor for rotationally driving the spool, and a spool displaceably provided on the reel body so as to increase or decrease the motor output of the spool drive motor in multiple stages. An electric reel for fishing, comprising a motor output adjuster, a clutch mechanism for transmitting or shutting off power for winding a fishing line on a spool, and an actuator for switching the clutch mechanism between a fishing line winding state and a fishing line feeding state, The motor output adjuster includes at least a motor output adjuster for increasing / decreasing a motor output in multiple stages and a power transmission selector for switching the clutch mechanism between a fishing line winding state and a fishing line feeding state by operating an actuator. In addition, the motor output adjusting section and the power transmission switching section can be separately processed by the same mechanism. Electric fishing reel that characterized the door. 2. The electric fishing reel according to claim 1, wherein the motor adjuster comprises a malfunction preventing means for the actuator and a canceling means for the malfunction preventing means. 3. The electric fishing reel according to claim 1, wherein the actuator includes a solenoid coil. 4. The electric fishing reel according to claim 2, wherein the malfunction prevention means / release means of the malfunction prevention means is a non-reciprocal operation circuit provided in the power transmission section.