JPH11201600A - Driving method of automatic ice machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent mechanical lock at the time of an initial setting operation, and to prevent vibration sounds or colliding sounds from being generated, by having the changeover position of the signal between an ice making position and an ice detecting position as a datum point, and by using the changeover of the signal at the time of the passage of this datum point to return an ice making dish to the ice making position. SOLUTION: An ice making dish is driven to take three positions as the rotating positions of the ice making dish, that are an ice making position, an ice detecting position, at which the dish still rotates, and an ice detecting arm is lowered, and an ice separating position, at which the dish still rotates to operate the separation of ice. A datum point, at which the signal changes, is provided between the ice making position and the ice detecting position. At the time of the initial setting operation, the ice making rotation is constantly performed toward this datum point, and the ice making dish is returned to the ice making position by using the changeover of the signal at this datum point. Therefore, the ice making dish can be returned to the ice making position without bringing the ice making dish to the mechanical lock position that causes the mechanical lock condition in the case when the ice making dish is rotated reversely from the ice making position at the time of the initial setting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic ice maker installed in a refrigerator for automatically producing ice and automatically replenishing the produced ice when a shortage of ice in an ice storage container is detected. Driving method.

[0002]

2. Description of the Related Art In recent years, home refrigerators and the like having an automatic ice making function have been known. As a drive device of an automatic ice making machine attached to this refrigerator, for example, a special application filed by the present applicant has been filed earlier. There is a driving device for an ice tray disclosed in Japanese Unexamined Patent Publication No. 9-264646. In such an automatic ice making machine, an ice detecting arm for detecting the amount of ice in an ice storage container is operated by an AC synchronous motor. The ice detecting arm is often driven by a cam surface or the like formed on a cam gear, as shown in Japanese Patent Application Laid-Open No. 9-264646.

The cam gear includes an ice making position where the ice detecting arm is in a standby state, an ice detecting position where the ice detecting arm detects whether or not the ice is full, and an ice tray when the ice in the ice storage container is insufficient. Twist the ice in the ice tray.
It is configured to have at least one position.

[0004] The rotation of the cam gear causes the ice detecting arm to move up and down, thereby detecting the amount of ice in the ice storage container. In this detection operation, a detection signal is generated at each of the ice making position, the full ice position, and the ice release position in order to confirm the position of the ice detecting arm and the like. The AC synchronous motor that drives the ice detection arm is controlled on / off and in the direction of rotation by the detection signal.

Although a detection signal at the ice making position is always generated, a detection signal at the ice releasing position is generated only when ice in the ice storage container is insufficient and an ice releasing operation is performed. Further, the detection signal at the ice detection position is generated only when the ice in the ice storage container is full and the ice is not full when the ice is insufficient.

[0006]

In the conventional driving method of an automatic ice making machine, in the operation at the time of initial setting for initialization, an operation of hitting a mechanical lock position disposed on the ice making position side is performed. If the ice tray is further rotated (= reverse rotation) to perform any operation beyond the above, the operation is also performed at the time of initial setting, which is not preferable. For example, when it is desired to perform a water supply operation by slightly rotating the ice making position in reverse, water is supplied even at the time of initial setting, and the conventional method of performing mechanical rotation by performing reverse rotation cannot be adopted.

In the method of driving an automatic ice making machine disclosed in Japanese Patent Application Laid-Open No. 9-26464, a cam gear is provided on a case or the like every time the initial setting is performed in order to always perform mechanical lock at the time of initial setting. Vibration noise and collision noise are generated. This noise is not so problematic when it occurs during the day, but when it occurs during the quiet hours of the night, it creates the risk that some users may consider it a defective refrigerator and reduce the commercial value of the refrigerator itself. Becomes

According to the present invention, the mechanical lock can be prevented from occurring at the time of the initial setting operation, so that no vibration sound or collision sound is generated, and at the time of the initial setting operation, the ice tray is not reversely rotated beyond the ice making position. It is an object of the present invention to provide a method of driving an automatic ice maker which can be performed as described above. Also, another invention is a method of driving an automatic ice maker in which a signal at an ice making position and a signal at an ice detecting position can be distinguished so that the ice making position can be reliably returned to the ice making position regardless of the rotational position of the ice tray. The purpose is to provide.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, an output shaft driven by a drive source, and an ice making device supported by the output shaft and rotationally driven by the drive source. A tray, an ice storage container for storing ice produced by the ice tray, and a detecting means for detecting the presence or absence of ice in the ice storage container, wherein the rotation position of the ice tray is the presence or absence of ice in the ice storage container. An ice making position for making the liquid in the ice tray sandwiching the ice detecting position for detecting the ice detection position, and a driving method for an automatic ice making machine having an ice releasing position for releasing the ice made ice,
A signal is generated between the ice making position and the ice detecting position, the switching position of the signal is used as a reference point, and the drive is started from the current position toward the reference point at the time of the initial setting operation. The ice tray is returned to the ice making position using the signal change.

[0010] According to the second aspect of the present invention, in the first aspect,
In the driving method of the automatic ice maker described above, the signal is the same signal as the signal generated at the ice detecting position, and the time from the reference point to the ice making position is longer than the signal generated at the ice detecting position. .

According to a third aspect of the present invention, in the driving method for an automatic ice making machine according to the first or second aspect, a signal is generated in all regions from the reference point to the ice making position. During the setting operation, when a signal is generated, the ice making tray is driven to the ice removing position side, and when no signal is generated, the ice making tray is driven to the ice making position side.

Further, according to the present invention, an output shaft driven by the drive source, an ice tray supported by the output shaft and rotationally driven by the drive source, and ice produced by the ice tray An ice storage container for storing ice, and a detection method for detecting the presence or absence of ice in the ice storage container, the method for driving an automatic ice maker, wherein the ice detection position for detecting the presence or absence of ice in the ice storage container is placed in an ice tray. It has an ice making position for making liquid ice, and an ice releasing position for releasing ice that has been made, and when the ice making tray is driven to rotate near the ice detecting position and near the ice making position, the length of each of these positions is reduced. Signal output means for outputting the same signal having a different predetermined length, and signal detection means for detecting the signal output by the signal output means, while the signal output means is outputting the signal near the ice making position. An ice making position is provided Drive the ice tray from the ice position to the ice detection position side, and set the length until the signal is no longer output to be longer than the predetermined length of the signal output by the signal output means at the ice detection position. When the signal is output at the start, the ice tray is once driven to the ice releasing position side, and after the signal is switched, the ice tray is reversed to return to the ice making position.

According to a fifth aspect of the present invention, in the driving method of the automatic ice making machine according to the fourth aspect, when no signal is output at the start of the initial setting operation, the ice making tray is rotated toward the ice making position. It has returned to the ice making position.

According to a sixth aspect of the present invention, in the driving method of the automatic ice making machine according to any one of the first to fifth aspects, the ice tray is rotatably driven on the side opposite to the reference point with respect to the ice making position. A water supply position for supplying liquid to the ice tray is provided at a position where the water is supplied.

The method for driving an automatic ice making machine according to the present invention is characterized in that the ice making tray is rotated at an ice making position, an ice detecting position at which the ice detecting arm is further rotated and the ice detecting arm is lowered, and the ice releasing operation is further performed to perform the ice releasing operation. The ice tray is driven to take three positions. Then, a reference point at which the signal is switched between the ice making position and the ice detecting position is provided, and at the time of the initial setting operation, the ice tray is always rotated toward this reference point and the signal switching at this reference point is performed. The ice tray is returned to the ice making position by using the ice tray. For this reason, at the time of the initial setting operation, it is possible to return to the ice making position without bringing the ice tray to the mechanical lock position where the ice tray is in the mechanical lock state when the ice tray is rotated backward from the ice making position.

The time from the reference point to the ice making position is
If the ice detection position is longer than the time of the ice detection signal, the ice making position signal can be judged from the difference in the length even if the ice detection signal and the ice making position signal are the same signal. Can be restored.

In this automatic ice making machine, when the liquid in the ice tray becomes ice, the ice detecting arm advances into the ice storage container to detect the storage state of the ice. If the ice in the ice storage container is insufficient, the ice detection arm will sufficiently advance into the ice storage container. By detecting the movement of the ice detecting arm, the automatic ice maker reverses the ice tray and drops ice into the ice storage container.
The ice tray may not be turned over, but may be slightly tilted to scrape out the ice therein. After the ice in the ice tray is removed, the ice tray is returned to the ice making position to produce new ice.

The driving source for rotating the ice tray is as follows.
Various mechanisms such as stepping motors, AC synchronous motors, condenser motors and other motors, and solenoids are employed. As the signal output means, in addition to a means for generating a signal using a Hall element and a magnet, an optical method for controlling light reception by blocking or passing light with a blocking member can be used. Further, as the signal detecting means, a microprocessor or other circuit provided in the driving position of the automatic ice maker or provided in the refrigerator body is employed.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 show an automatic ice making machine employing a driving method according to an embodiment of the present invention. The automatic ice making machine 1 is installed in an ice making room of a refrigerator. The automatic ice maker 1 includes an ice tray 2 disposed above an ice storage container (not shown), an ice detection arm 3 serving as ice detecting means that moves up and down to detect the amount of ice stored in the ice storage container, and And the like, and a driving device 5 for driving the ice tray 2, the ice detection arm 3, and the rocking member 4 in conjunction with each other. Note that a thermistor 1a for detecting the temperature of the ice tray is provided below the ice tray 2.

The driving device 5 lowers the tip of the ice detecting arm 3 into the ice storage container, and detects the presence or absence of ice in the ice storage container based on the lowered distance. And this driving device 5
When the shortage of ice is detected, the ice making tray 2 is turned over to the ice release position and the ice is dropped into the ice storage container. The inverted ice making tray 2 is twisted and deformed when the protruding portion 2a on the other end strikes a contact piece (not shown) provided on the machine frame 6 of the refrigerator or the automatic ice making machine 1, and ice is formed by utilizing this deformation. Let it fall. Thereafter, the driving device 5 returns the ice tray 2 to the ice making position.

In a normal automatic ice maker, water is poured into the ice tray 2 at this ice making position. However, the automatic ice maker of this embodiment is rotated slightly more, for example, 10 to 20 degrees past the ice making position. By the rotation in the opposite direction, the protruding engaging portion 2b provided on the ice tray 2 is engaged with the one side 4a of the swinging member 4, and the swinging member 4 becomes a swing fulcrum provided on the machine frame 6. Swing about the part 7. By this swinging, the other end 4b of the swinging member 4 operates the on-off valve 8 serving as the liquid supply means, and supplies water to the ice tray 2. The engaging portion 2b
Is provided in the vicinity of the driving device 5, so that a driving force from an output shaft 25 described later is easily transmitted to the swinging member 4.

As shown in FIG. 3, the swinging member 4 has one end 4a pushed downward, and the other end 4b projects upward. Moreover, the protruding portion is located at a position farther from the portion where the driving device 5 is disposed. The other end 4b of the swing member 4 is in contact with the operating rod 8a, and pushes up the on-off valve 8 via the operating rod 8a. When the on-off valve 8a is pushed up,
The water in the water storage tank 8b serving as the liquid storage tank is filled with water in the water receiving tray 8c.
The water is supplied to the ice tray 2 from the water supply pipe 8d.

As shown in FIGS. 4 and 5, the driving device 5 includes a cam gear 10 which is connected to the ice making tray 2 and serves as a cam for inverting the same, and a part of the intervening member operated by the cam gear 10. And an ice detection mechanism 11 and a switch mechanism 12 which constitute the above. The internal mechanism of the driving device 5 includes a case 9 composed of two cases 9a and 9b.
Is located within.

The cam gear 10 is rotated by a stepping motor 13 serving as a driving source. That is, the rotation of the stepping motor 13 is transmitted to the cam gear 10 via the rotation transmitting means 14. This rotation transmitting means 14
A pinion 15 provided on a rotor output shaft 13a of the stepping motor 13, a first gear 16, a second gear 17, a third gear 18, and a fourth gear 16 for sequentially reducing the rotation of the pinion 15.
It comprises a gear 19 and a fifth gear 20.

As shown in FIG. 5, the first gear 16 and the third gear 18 are rotatably and vertically overlapped on a fixed shaft 22 provided between one case 9a and the motor end face. . Each of the first gear 16 and the third gear 18 is composed of a large-diameter gear portion and a small-diameter pinion portion. The second gear 17 and the fourth gear 19 are rotatably and vertically overlapped on a fixed shaft 23 provided between one case 9 a and the middle base plate 21. The second gear 17 and the fourth gear
The gear 19 also includes a large-diameter gear portion and a small-diameter pinion portion.

The gear section of the second gear 17 meshes with the pinion section of the first gear 16. The pinion of the second gear 17 is a gear of the third gear 18, the pinion of the third gear is a gear of the fourth gear 19, and the pinion of the fourth gear 19 is a gear of the fifth gear 20. The pinion of the fifth gear 20 meshes with the gear 10 a of the cam gear 10.
Therefore, the rotor output shaft 1 of the stepping motor 13
The rotation of 3a is transmitted to the cam gear 10 while being successively decelerated by the rotation transmitting means 14.

FIG. 6 shows the cam gear 10. An output shaft 25 is integrally formed with the cam gear 10.
The output shaft 25 projects out of the drive device 5 from a hole provided in one of the cases 9 a and is connected to the ice tray 2. Therefore, the cam gear 10 and the ice tray 2 rotate integrally.

Also, one case 9a of the cam gear 10
A groove 26 is formed on one side surface 10b facing the peripheral direction along the circumferential direction. A protrusion (not shown) formed on the inner surface of one case 9a is inserted into the groove 26.
The rotatable angle of the cam gear 10 is limited to a predetermined range. That is, the positions where the projections abut both end surfaces 26a and 26b of the groove 26 are defined as the rotation limit positions of the cam gear 10. In the case of the present embodiment, the cam gear 10 is -20.
It can rotate from 170 degrees to 170 degrees. Note that this rotation angle is within the allowable rotation range when the stepping motor 13 runs away, and normally operates within a range of -10 degrees to 160 degrees as described later.

On the other hand, an annular concave portion 27 is formed on the other side surface 10c of the cam gear 10 facing the middle base plate 21. The surface on the rotation center side of the concave portion 27 forms a cam surface 28 for an ice detection shaft, and the surface on the outer peripheral side forms a cam surface 29 for a magnet lever. Each of the cam surfaces 28 and 29 is formed on a side wall of an extension portion extending substantially in parallel with an axis serving as a rotation center of the cam gear 10. The ice detection shaft cam surface 28 has an ice detection non-operation position 28a, an ice detection lowering operation unit 28b, an ice shortage detection position 28c, and an ice detection return operation unit 28d. On the other hand, the magnet lever cam surface 29 is provided with a first ON signal generating cam portion 29a.
And a first off-signal generating cam portion 29b and a second on-signal generating cam portion 29c serving as a second on-signal generating portion.
And a second off signal generating cam portion 29d.

The ice detecting mechanism 11 includes an ice detecting shaft lever (transmission member) 31 operated by the cam gear 10 and an ice detecting shaft 32 for transmitting the movement of the ice detecting shaft lever 31 to the ice detecting arm 3.
And a coil spring 33 for giving a force to swing the ice detection shaft 32, and an arm 34 for attaching the coil spring 33.

The ice detecting shaft lever 31 is disposed between the cam gear 10 and the middle base plate 21. Ice detection shaft lever 31
The surface of one end facing the cam gear 10 has a projection 31a.
Are formed. The convex portion 31a is formed at a position radially separated from the rotation center axis of the ice detecting shaft lever 31, and is rotatable around the rotation center axis. The projection 31a is a cam follower that comes into contact with the ice detection shaft cam surface 28 formed on the cam gear 10.

The ice detecting mechanism 11 having the above-described structure is provided with an ice detecting shaft lever 31 which operates along the ice detecting shaft cam surface 28.
Is transmitted to the ice detecting arm 3 and the movement of the ice detecting arm 3 is transmitted to the magnet swing inhibiting member 43 described later. That is, when the ice detecting arm 3 stops its movement due to full ice, the ice detecting axis 32 moves to the ice detecting arm 3.
And stops its rotation.

The other end of the coil spring 33 is hooked on a spring hook 21a provided on the middle base plate 21, so that the ice detecting arm 3 is constantly biased toward the ice detecting position. That is, the urging force is applied to the ice detecting shaft cam surface 28 in the direction in which the ice detecting shaft lever 31 is brought into contact. This force is directed from the center of the cam gear 10 to the outer periphery and does not hinder the assembly of the two cases 9a and 9b. For this reason, the cam gear 10 does not rise due to the force of the coil spring 33, and the cam gear 10 can be easily assembled and the two cases 9a and 9b can be easily integrated.

The switch mechanism 12 serving as a signal output means includes:
A magnet lever 41 operated by the cam gear 10, a Hall IC 42 that changes a detection signal according to the swing of the magnet lever 41, a magnet swing inhibiting member 43 that acts to inhibit the swing of the magnet lever 41, And a coil spring 44 for applying a force for swinging the magnet lever 41.

The magnet lever 41 is connected to one of the cases 9
a and a base plate 21, and a shaft portion 41 a of the shaft portion 41 a is swingably attached to a through hole 21 b integrally formed with the base plate 21. A convex portion 41 b having a mountain shape is formed on a surface of one end of the magnet lever 41 on the side of the cam gear 10. The projection 41b is a cam follower that comes into contact with the magnet lever cam surface 29 formed on the cam gear 10. Therefore, when the cam gear 10 rotates, the convex portion 41b becomes the cam surface 29 for the magnet lever.
Along the radial direction of the cam gear 10, and the magnet lever 41 swings.

At a predetermined position of the magnet lever 41, a protruding arm 41c is formed. This protruding arm 41c
Is a magnet swing inhibiting member 4 provided on the ice detecting shaft 32.
3. When the magnet swing inhibiting member 43 is in contact with the projection 41c, the magnet lever 41 cannot swing. On the other hand, a permanent magnet 46 for operating the Hall IC 42 is attached to the tip of the magnet lever 41. The magnet lever 41 has a protruding arm 4 symmetrically with respect to the protruding arm 41c.
1d is provided, and one end of a coil spring 44 is attached. The other end of the coil spring 44 is
It is hooked on a shaft 21 c provided on the middle base plate 21.

The Hall IC 42 is fixed to the middle base plate 21 and connected to a printed wiring board 51 mounted between the middle base plate 21 and the other case 9b. The Hall IC 42 is disposed so as to face the permanent magnet 46 at the other end when the magnet lever 41 is at the operating position. As shown in FIG. 13, the Hall IC 42 is electrically connected to a controller 52 serving as signal detection means. When the magnet lever 41 is at the non-operation position, the Hall IC 42 outputs a low-level signal (hereinafter, referred to as an L signal) to the controller 52 as a detection signal. On the other hand, when the magnet lever 41 swings and faces the Hall IC 42,
Reference numeral 42 outputs a high-level signal (hereinafter, referred to as an H signal) to the controller 52 as a detection signal.

The Hall IC 42 has a cam gear 10 of -10.
H signals are output at two positions during rotation from degrees to 160 degrees. That is, the magnet lever cam surface 29 for operating the magnet lever 41 is provided with a first ON signal generation cam portion 29a and a full ice ON signal generation cam portion 29c which are recessed at two positions. Each time the convex portion 41b of the magnet lever 41 reaches these concave portions and the magnet lever 41 swings, the Hall IC 42 outputs an H signal. The output H signal is
The controller 52 recognizes it as an ice making position signal or an ice detecting position signal (identification signal) depending on the difference in the generation position. The controller 52 recognizes the current position of the cam gear 10 based on these signals.

Various electronic components 53 for a control circuit including a controller 52 for operating the automatic ice maker 1 are provided on the other case 9b side of the printed wiring board 51. The control circuit such as the controller 52 may be provided not in the automatic ice maker 1 but in a circuit on the refrigerator main body side in which the automatic ice maker 1 is installed.

The magnet lever 41 is urged by a coil spring 44 in a direction in which it comes into contact with the magnet lever cam surface 29. This force is directed from the outer periphery of the cam gear 10 toward the center and does not hinder the assembly of the two cases 9a and 9b. For this reason,
The cam gear 10 is not lifted up by the force of the coil spring 44, so that the cam gear 10 can be easily assembled and the two cases 9a and 9b can be easily integrated, so that the assembly is easy.

The controller 52 has a microcomputer. Then, as shown in FIG.
A 12 V DC power supply is input to a V or 120 V AC power supply via a conversion unit 54 and a rectification unit 55. The thermistor 1 a and the Hall IC 42 are electrically connected to the input side of the controller 52, and the stepping motor 13 is electrically connected to the output side via a drive circuit 56. Further, the controller 52 has a timer circuit. Further, the storage device of the controller 52 stores a basic operation program and an initial setting program. The controller 52 repeatedly executes these control programs, and rotates the stepping motor 13 forward or backward based on a detection signal supplied from the Hall IC 42 or the like.

The controller 52 constitutes control means. Also, the controller 52 sends a signal for controlling another device, for example, an electromagnetic valve for absorbing water to the water storage tank 8b, and the on-off valve 8 when the swing member 4 is not used, as necessary. Can be transmitted.

Next, the operation of the driving device 5 of the automatic ice maker 1 will be described. The controller 52 appropriately executes the basic operation program and the initial setting program, and
4 and FIG. For example, the basic operation program is an AND operation in which the door is not opened and a certain time elapses after the completion of ice making is detected by the thermistor 1a placed under the ice tray.
When the condition is satisfied, a signal indicating the end of standby is input to the controller 52 and executed. Further, the initialization program is executed, for example, when either the power-on signal or the initialization signal is input to the controller 52.

The overall operation of the automatic ice maker 1 is shown in FIG.
As shown in FIG. First, when the power is turned on (step S1), the initial setting program operates (step S2). Next, a basic operation program is started, and an ice production state is entered (step S3). The controller 52 detects whether or not the ice production has been completed with the thermistor 1a (step S4), and upon detecting the completion, goes to detect the amount of ice in the ice storage container (step S5). In addition, when starting from the initial setting, water is not supplied,
Since the thermistor 1a senses the temperature inside the refrigerator regardless of the presence or absence of ice, it determines that ice production has been completed, proceeds to the next step, and performs a water supply operation (step 8) after the ice removal operation (step 7) described later is completed. )I do.

Then, the controller 52 detects whether or not the ice in the ice storage container is in a shortage state (step S7). If the ice is not full, that is, if the ice is in a shortage state, the ice making tray 2 is detected.
Is inverted and ice is supplied to the ice storage container (step S8).
The ice tray 2 is then placed at the position where water is supplied (step S
Go back to 3). On the other hand, if the ice is full,
Does not reverse, returns to the original state, a timer for a predetermined time operates (step S9), and returns to the step of the ice storage state detection operation of step S6.

Initial setting program (initialization)
Are as shown in FIG. In the following, the positional relationship between the magnet lever 41 and the Hall IC 42 is divided into two states, “switch H” and “switch L”, based on the generated signal. In the initial setting program, first, the state of the magnet lever 41 is detected. That is, the controller 52 determines whether or not the switch is outputting an H signal (step S11). If negative (NO), the controller 52 rotates the stepping motor 13 in the reverse direction (counterclockwise rotation = CCW rotation) to make ice. The cam gear 10 is driven in the position direction (step S12).

Thereafter, the controller 52 detects whether or not the switch outputs an H signal (step S13), and if affirmative (YES), sets a timer (step S14). The timer time at this time is, as shown in FIG. 14, a time tb longer than the time ta of the full ice ON signal, that is, a time tb from the reference point to the ice making position. In other words, the reference points are provided such that the relationship of tb> ta is satisfied.

During the time when this timer is working,
The controller 52 detects whether or not the switch continues the H signal (step S15), and if affirmative (YES), determines whether or not the timer has expired (step S1).
6) When the operation is completed, the stepping motor 13 is stopped (step S17). That is, if the switch is in the H signal state when the timer expires, the controller 52 determines that the H signal is not the full ice ON signal but the ON signal at the ice making position, and the stepping motor 13 is stopped. Thereby, the cam gear 10 is set at the position of 0 degrees. However, when the switch generates the L signal within the timer time in step S15, the position where the H signal was generated was the full ice ON signal, and the stepping motor 13 was detected to detect the generation of the next H signal. Continue counterclockwise rotation of.

If the switch is in the H signal generation state in step S11, the stepping motor 13 rotates in the forward direction (clockwise rotation = CW rotation), and drives the cam gear 10 in the direction of the ice release position (step S18). This is because the automatic ice making machine 1 according to the present embodiment shifts to the water supply position when the rotation is further reversed from the ice making position, and automatically supplies water. Then, there is a risk that the water is further supplied to the ice tray 2 having already full ice or water. In order to avoid such danger, the initial setting program never supplies water.

In step S18, the stepping motor 13
Starts the CW rotation, the controller 52 detects whether or not the switch generates the L signal (step S19). If the result is affirmative (YES), the controller 52 proceeds to step S12 and immediately rotates the stepping motor in the CCW direction. After that,
Perform steps S13 to S17 shown above,
The cam gear 10 is set to the position of 0 degree.

Next, the basic operation program will be described with reference to FIGS.

When the basic operation program is not executed, the cam gear 10 has returned to the ice making position (the position where the rotation angle θ is 0 degree). In this state, the ice tray 2
It is held horizontally as shown in FIG. The ice detecting shaft cam surface 28 for operating the ice detecting mechanism 11 has a convex portion 31.
a is moved to the center side of the cam gear 10 and the ice detection shaft 3
2 is returned to the non-working position. In this state, the ice detection arm 3 is stored on the side of the ice tray 2 as shown by a solid line in FIG. On the other hand, the convex portion 41b of the magnet lever 41 in the switch mechanism 12 moves radially inward along the cam surface 29 for the magnet lever, and the magnet swing inhibiting member 43 is separated from the projection arm 41c. Therefore, the magnet lever 41 comes into contact with the concave portion of the cam surface 29 for the magnet lever by the spring force of the spring 44 and can swing.

After completing steps S1 and S2 shown above,
The ice tray 2 stands by at the ice making position. First, the controller 5
2 determines whether or not a predetermined time has elapsed at the ice making position (step S21), and if affirmative (YES), the thermistor 1a determines whether or not the ice tray 2 is at or below a predetermined temperature (step S22). ).

When the controller 52 is closed, for example, after the door of the refrigerator is opened, and it is confirmed that ice is formed on the ice tray 2, the controller 52 executes the basic operation program. May be started.
In this basic operation program, an ice detection state based on the operation mode when the ice storage amount is insufficient or the operation mode when the ice storage amount is full shown in FIG. 14 is executed according to the ice storage amount in the ice storage container.

In step S23 of FIG. 17, the controller 52 that has started executing the basic operation program first sets the number of steps required when the amount of ice stored in the ice storage container is insufficient. That is, the cam gear 10 is set to 0
The number of steps required to drive from degrees to 160 degrees is set. Next, the stepping motor 13 is rotated forward to rotate the cam gear 10 in the arrow CW direction in FIG. 4 (step S24). Next, the controller 52 determines in step S2
5 and the detection signal supplied from the Hall IC 42 is L
It is determined whether the signal is a signal or not, and step S25 is repeatedly executed until an L signal is detected. In a state where the H signal (ice making position signal) is detected without detecting the L signal, it is considered that the cam gear 10 has not yet sufficiently rotated from the ice making position.

Then, the cam gear 10 rotates sufficiently in the CW direction, and the first off signal generating cam portion 29b of the magnet lever cam surface 29 for operating the switch mechanism 12
When the protrusion 41b is moved radially outward, the magnet lever 41 swings. As a result, the detection signal (= switch) of the Hall IC 42 changes from the H signal to the L signal, and the ice making position signal is turned off. This position is the reference point shown in FIG. Therefore, the determination result of step S25 becomes affirmative (YES), and the controller 52 executes step S2.
Proceeding to 6, it is determined whether the switch generates an H signal.

When the state where the H signal is not generated from the switch continues, it is determined whether or not the set number of steps has been completed (step S27).
The controller 52 stops the stepping motor 13 (Step S28). Here, the switch keeps generating the L signal because the magnet swing inhibiting member 43
The rotation of the ice detection shaft 32, that is, the rotation of the ice detection arm 3 is sufficient to move the ice detection shaft 32 to a position in contact with the protruding arm 41c of the magnet lever 41, thereby inhibiting the swing of the magnet lever 41. is there.

The operation from step S26 to step S27 will be described in detail again. That is, the controller 52 determines in step S26 that the detected signal is H
It is determined whether the signal is a signal. H detected in this state
The signal is an ice detection position signal. When the determination result is negative (NO) without confirming the rise of the ice detection position signal, the controller 52 proceeds to step S27 and determines whether the set number of steps is completed. Then, the controller 52 repeatedly executes steps S26 and S27 until the set slap number ends. In this state, since the cam gear 10 is rotating in the direction of arrow CW in FIG. 4, when the rotation angle θ reaches 10 degrees, the convex portion 31 a of the ice detecting mechanism 11 It reaches the ice detection lowering operation section 28b.

When the amount of ice stored in the ice storage container is insufficient, the ice detecting arm 3 can be lowered to a predetermined position without being disturbed by the ice in the ice storage container. Therefore, the convex portion 31a moves radially outward along the ice detecting lowering portion 28b of the ice detecting shaft cam surface 28, and swings the ice detecting shaft lever 31. Thereby, the ice detection shaft 32 is rotated, and the tip of the ice detection arm 3 starts to descend.

When the rotation angle θ of the cam gear 10 reaches 32 degrees, the ice detecting arm 3 moves to the position indicated by the two-dot chain line in FIG. At this time, the ice detecting shaft lever 31 swings to the ice shortage detecting position 28c of the ice detecting shaft cam surface 28, and the magnet swing inhibiting member 43 provided on the ice detecting shaft 32 causes the switch mechanism 12 to rotate. It hits the projection arm 41c formed on the magnet lever 41. Therefore, the magnet lever 4
1 is restricted from moving by the magnet swing member 43 and cannot swing. Therefore, even if the convex portion 41b of the switch mechanism 12 reaches the full ice ON signal generating cam portion 29c which is a concave portion of the magnet lever cam surface 29, the convex portion 41b is not
It does not move along 9 but leaves this cam surface 29. In this state, the permanent magnet 46 does not face the Hall IC 42, and the Hall IC 42 continues to supply the L signal to the controller 52.

Accordingly, the determination result of step S26 continues to be negative, and the controller 52 executes step S27 and returns to step S26 until the set number of steps is reached. Since the magnet lever 41 cannot swing while the ice detecting arm 3 is descending, the controller 52 does not detect the H signal, and repeats the steps S26 and S27.

Further, when the cam gear 10 is rotated in the direction of the arrow CW, the convex portion 41b of the magnet lever 41 comes into contact with the magnet lever cam surface 29 again. Even when the regulation is released, this magnet lever 41
Does not rock. Therefore, when the ice storage amount in the ice storage container is insufficient, the ice detection position signal is not output. In this embodiment, the Hall IC 4
As the operation 2, a so-called active high control method is adopted.

When the rotation angle θ of the cam gear 10 reaches 58 degrees, the convex portion 31a starts to move radially inward along the ice detecting return operation portion 28d of the ice detecting shaft cam surface 28. Further, when the rotation angle θ of the cam gear 10 reaches 80 degrees, the convex portion 31a of the ice detecting shaft lever 31 rides on the ice detecting inoperative position portion 28a of the ice detecting shaft cam surface 28, and the ice detecting shaft lever 3
1 returns to the inactive position. Even in this state, as described above, the magnet lever 41 does not swing,
The Hall IC 42 continues to supply the L signal to the controller 52. Therefore, the controller 52 determines in step S2
6 and step S27 are repeatedly executed.

Then, after a short time, the number of steps set in step 23 is reached. Accordingly, the determination result of step S27 becomes positive, and the controller 52 proceeds to step S28. Controller 52
Is that the H signal, that is, the ice detection position signal could not be detected while operating the set number of steps,
Recognize that the ice storage volume in the ice storage container is insufficient.

In step S28, the controller 52
Stops the stepping motor 13 for one second. That is, the position at which the rotation angle θ of the cam gear 10 reaches 160 degrees is the ice release position, and the ice tray 2 is as shown in FIG. In this state, the ice tray 2 is twisted and deformed on the contact piece, and the ice comes off the ice tray 2 and falls into the ice storage container.

Thereafter, in this embodiment, when a predetermined number of steps (= 160 ° position) is reached, as shown in FIG. 18, the controller 52 proceeds to step S29 to move the cam gear 10 to the arrow in FIG. The stepping motor 13 is rotated in the reverse direction to rotate in the CCW direction. Thereafter, the cam gear 10 enters the return stroke. The cam gear 10 is further rotated in the direction of the arrow CW, and when the rotation angle θ of the cam gear 10 reaches 170 degrees, the groove 26 formed in the cam gear 10 is formed.
End face 26b hits the projection of one case 9a,
You may make it impossible to rotate in the direction of arrow CW after it becomes a so-called mechanical lock state.

In this embodiment, a high speed operation is performed from the ice making position to a position immediately before the ice releasing position, the speed is increased, and a torque is increased from just before the ice releasing position to the ice releasing position at a low speed. That is, in the period from when the ice tray 2 starts to be twisted to when the ice is dropped, the speed of the stepping motor 13 is reduced in order to gain torque. For example, in a normal small stepping motor, the ice making position (0 degree)
From the ice position (160 degrees) over 6 minutes,
The time until the start of the torsion is about 5 minutes is about 1 minute, and the drive from 0 to 160 degrees is performed in about 2 minutes in total. However, a constant speed drive may be used in which the ice is separated over a period of about 3 to 7 minutes using a small stepping motor without shifting.

Next, the controller 52 determines in step S30
To determine whether the detection signal has changed from the H signal to the L signal. If affirmative (YES), a timer is set (step S31). The timer time at this time is
As shown in FIG. 14, the time tb is longer than the time ta of the ON signal at full ice. That is, the reference points are provided so that tb> ta. Within the time that this timer is running, the controller 52 will
It is detected whether or not to continue the signal (step S32), and if affirmative (YES), it is determined whether or not the timer has expired (step S33). The number of steps is set (step S34).

When the cam gear 10 rotates in the direction of the arrow CCW and the convex portion 41b of the switch mechanism 12 passes through the full ice ON signal generating cam portion 29c of the magnet lever cam surface 29, the magnet lever 41 is turned on. Swingable or unswingable. Therefore, the signal of the Hall IC 42 may be an H signal or an L signal. This is because the following two states may exist in the return stroke. That is, in the first state, the ice in the ice storage container becomes full, and the ice detecting arm 3 stops at the full ice detection level (the state indicated by the one-dot chain line in FIG. 2) and cannot move any further. This is a case where the member 43 cannot abut on the protruding arm 41c of the magnet lever 41 and its movement cannot be restricted. In the second state, the ice in the ice storage container does not become full, the ice detection arm 3 drops below the full ice detection level, the magnet swing inhibiting member 43 comes into contact with the projection arm 41c of the magnet lever 41, and the movement thereof is stopped. Is regulated.

Next, the controller 52 determines in step S3
Proceeding to step S5, it is determined whether or not the set number of steps has been reached. When the determination is affirmative, the process proceeds to step S36, and the emptied ice tray 2 is filled with water. This water injection
It is gradually performed before reaching the water supply position of -10 degrees. That is, since the engaging portion 2b of the ice tray 2 starts to gradually push the one side 4a of the swing member 4, the on-off valve 8 is also gradually opened. This water supply is performed reliably with the ice tray 2 tilted 10 degrees in the reverse direction as shown in FIG. 21 and by completely stopping the stepping motor 13 for one second (step S36). In order to reliably control the water supply amount, the speed of the stepping motor 13 from the ice making position (0 degree) to the water supply position (-10 degrees) is set to be higher than other parts, or after the opening / closing valve 8 starts to open. High-speed driving may be performed until completely opened.

After water is supplied, the controller 52
The stepping motor 13 is rotated CW (step S37), and the number of steps is set (step S3).
8). Thereafter, the controller 52 determines whether or not the number of steps has been reached (step S39), and stops the stepping motor 13 when the number has been reached (step S4).
0). This stop position is the ice making position (0 degree). Thereafter, the process returns to step S21, and when the above-described execution start condition of the program is satisfied, the execution of this program from step S21 to step S40 is started again.

On the other hand, consider the case where the amount of ice stored in the ice storage container is sufficient. In this case, it is not necessary to turn the ice tray 2 upside down to perform the ice removing operation, and the ice tray 2 is immediately returned to the ice making position.

When the amount of ice stored in the ice storage container is sufficient, the ice detection arm 3 cannot hit the ice in the ice storage container and descend. Therefore, the driving device 5 starts,
When the cam gear 10 is rotated from the ice making position in the direction of the arrow CW and the rotation angle θ reaches 41 degrees, the ice detecting shaft lever 3
Although 1 slightly swings, the ice detecting arm 3 hits the ice and cannot swing any more, and the convex portion 31a of the ice detecting mechanism 11 is separated from the ice detecting shaft cam surface 28. For this reason,
The magnet swing prohibiting member 43 cannot regulate the protruding arm 41c formed on the magnet lever 41 of the switch mechanism 12, and the convex portion 41b of the switch mechanism 12 becomes a concave portion of the magnet lever cam surface 29 when the ice is full. The magnet lever 41 moves along the ON signal generating cam portion 29c.
Swings.

The swing of the magnet lever 41 changes the signal of the Hall IC 42 from the L signal to the H signal in step S26 in FIG. That is, the ice detection position signal rises and the determination result in step S26 becomes positive, and the controller 52 proceeds to step S51 in FIG. 17 and stops the stepping motor 13 for one second.
Thereafter, the process immediately proceeds to the return stroke of the cam gear 10, and the controller 52 proceeds to step S52, where the cam gear 10
To rotate the stepping motor 13 in the direction of the arrow CCW.

Thereafter, the controller 52 determines whether or not the switch is outputting the L signal (step S5).
3) If affirmative (YES), it is determined whether the switch outputs an H signal (step S54), and if affirmative (YES), a timer is set (step S54).
55). The timer time at this time is, as shown in FIG. 14, a time tb longer than the time ta of the full ice ON signal, that is, a time tb from the reference point to the ice making position.

During the time when this timer is working,
The controller 52 detects whether or not the switch continues the H signal (step S56), and if affirmative (YES), determines whether or not the timer has expired (step S5).
7) If it has been completed, the stepping motor 13 is stopped (step S58). That is, if the switch is in the H signal state when the timer expires, the controller 52 determines that the H signal is not the full ice ON signal but the ON signal at the ice making position, and the stepping motor 13 is stopped. Thereby, the cam gear 10 is set at the position of 0 degrees. However, if the switch generates the L signal within the timer time in step S56, the position at which the H signal was generated was another signal, and the stepping motor 13 is operated to detect the next generation of the H signal. Continue clock rotation.

The controller 52 detects whether or not a predetermined time has elapsed since the stepping motor 13 stopped (step S559). If the determination is affirmative (YES), the process returns to step S22 to determine whether or not the temperature is equal to or lower than the predetermined temperature. Is detected.
Thereafter, the same steps as described above are repeated.
Note that the determination of the elapse of the predetermined time in step S59
Instead of the stepping motor 13 being stopped, the measurement may be made based on another time point, for example, step S21, that is, the time point at which the predetermined time has elapsed before the detection.

The above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, as shown in FIG. 22, the relationship of time tb> time ta may be left as it is, a signal switched at the reference point may be a signal from the reference point to the ice making position, and the signal may return to the original at the ice making position. In this case, the operation at the time of initial setting is
Regardless of the rotational position of the cam gear 10, it is preferable to always drive the cam gear 10 to the ice-releasing position at the start of driving. Only when the initialization is performed between the ice detecting position and the ice removing position, the rotation direction is changed using the rotation limit position of 170 degrees.

The output gear 25 is a cam gear 1 serving as a cam.
0 and may be separated from each other, and in that case, they may be driven by different driving sources. Also, instead of urging the convex portion 31a of the ice detection shaft lever 31 serving as a cam follower to rotate from the rotation center of the cam gear 10 to the outer peripheral direction, conversely, from the outer peripheral direction to the rotation center direction of the cam gear 10 The rotation may be biased.

Also, a convex portion 31a serving as a cam follower
May be provided on the ice detection shaft 32 itself, instead of being provided on the ice detection shaft lever 31 fixed to the ice detection shaft 32. Further, the ice detecting arm 3 and the ice detecting shaft 32 may be formed as an integrated part without being separated.

Further, the ice tray 2 shown in the above-described embodiment is used.
Instead of providing the engaging portion 2b, an engaging portion with the swing member 4 may be provided on the output shaft 25, or an arm may be attached to the output shaft 25 so that the swing member 4 is operated by the arm.

Further, in the above-described embodiment, the H signal at the ice detecting position is generated only when the ice is full. However, the H signal is not generated when the ice is full, but is generated when the ice is insufficient. You may do it. Further, in the above-described embodiment, the relationship between the magnet lever 41 and the Hall IC 42 is set to be active high, but may be set to an active-low relationship where an L signal is generated at a position where the two oppose each other. Further, as the signal output means, other means such as an optical method using a light emitting element, a light receiving element and a shielding means may be employed.

Further, instead of using the stepping motor 13 as the driving source, an AC motor or a condenser motor may be used, and the rotation angle of the cam gear 10 may be controlled not by the number of steps but by time. Further, a drive source other than a motor such as a solenoid may be employed. In addition, as the liquid to be iced, drinks such as juices and non-drinks such as test reagents can be used in addition to water. As a means for detecting whether or not the ice in the ice storage container has been formed, a bimetal using a shape memory alloy or the like may be used in addition to the thermistor 1a.

Further, the on-off valve 8 serving as the liquid supply means and the swinging member 4 serving as the liquid supply operation means may be integrated. Further, a switch mechanism is provided in place of the swing member 4,
By pressing the switch, the on-off valve 8 or the like may be operated, or a string such as a ventilation fan may be provided, and the string may be pulled between the ice making position and the water supply position.

[0086]

As described above, in the driving method of the automatic ice making machine according to the first aspect, it is possible to prevent the mechanical lock from being performed at the time of the initial setting, and to prevent the generation of vibration noise and collision noise. Therefore, the commercial value is improved and the life of the automatic ice maker can be extended.

According to the second aspect of the present invention, the switch mechanism serving as the signal output means can be simplified, and the signal at the ice detecting position can be distinguished from the signal generated at the reference point, so that the ice tray can be reliably moved to the ice making position. Can be restored.

Further, according to the third aspect of the present invention, when the ice tray is at a position rotated beyond the ice making position, the ice tray is driven to the ice separating position without further reverse rotation and then returned to the ice making position. be able to. For this reason, an operation mode other than ice making and ice separation can be set at a position further rotating in reverse from the ice making position.

Further, according to the fourth aspect of the invention, it is possible to prevent the mechanical lock from being performed at the time of the initial setting, and to prevent the generation of a vibration sound and a collision sound. Therefore, the commercial value is improved and the life of the automatic ice maker can be extended. Further, the switch mechanism serving as the signal output means can be simplified, the signal at the ice detecting position can be distinguished from the signal generated at the reference point, and the ice tray can be reliably returned to the ice making position. Further, when the ice tray is at a position rotated beyond the ice making position, the ice tray can be driven to the ice separating position without further rotating in the reverse direction and then returned to the ice making position. For this reason, an operation mode other than ice making and ice separation can be set at a position further rotating in reverse from the ice making position.

In addition, according to the fifth aspect of the present invention, when the ice tray is initialized while the ice tray is rotating toward the ice separating position, the ice tray returns immediately to the ice making position. For this reason, mechanical lock does not occur during initialization regardless of the position of the ice tray. Further, in the invention according to claim 6, since the water supply position is provided in a place where the ice tray is rotated on the opposite side to the ice release position, the water supply position can be changed without affecting the operation of ice release from normal ice making. It can be set. For this reason, it becomes possible to perform a water supply operation by adding a simple mechanism.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of an automatic ice making machine employing a driving method according to an embodiment of the present invention.

FIG. 2 is a side view of the automatic ice maker of FIG.

3 removes an ice tray from the automatic ice maker of FIG. 2,
It is a side view which added the water storage tank etc.

FIG. 4 is a front view showing the driving device of the automatic ice making machine of FIG. 1, in which one case is removed so that the inside can be observed.

FIG. 5 is an illustration of the ABCD-DEFG of the driving device of FIG. 4;
FIG. 4 is a development view showing a cross section taken along line -H and showing a connection relation of the rotation transmitting means.

6A and 6B show a cam gear of the drive device of FIG. 4, wherein FIG. 6A is a plan view thereof, and FIG. 6B is a sectional view taken along line BB of FIG.

FIG. 7 is a cross-sectional view of a main part of the driving device of FIG. 4 along line VII-VII.

8 is a cross-sectional view of a main part of the driving device of FIG. 4, taken along line VIII-VIII.

9 is a cross-sectional view of a main part of the drive device of FIG. 4 along line IX-IX.

FIG. 10 is a front view of a driving device of the automatic ice maker of FIG. 1;

11 is a right side view of the driving device of FIG.

FIG. 12 is a plan view of the driving device of FIG. 10;

FIG. 13 is a block diagram showing a control system of the automatic ice maker of FIG. 1;

FIG. 14 is a diagram showing an operation state of the automatic ice maker of FIG. 1;

FIG. 15 is a flowchart showing an outline of an operation executed by a controller of the automatic ice maker shown in FIG. 1;

FIG. 16 is a flowchart showing an initial setting program of a controller of the automatic ice maker shown in FIG. 1;

FIG. 17 is a flowchart of a first half of a basic operation program executed by a controller of the automatic ice maker shown in FIG. 1;

FIG. 18 is a flowchart of the latter half of a basic operation program executed by the controller of the automatic ice maker shown in FIG. 1;

FIG. 19 is a side view showing an ice making position of an ice tray of the automatic ice making machine shown in FIG. 1;

FIG. 20 is a side view showing a state of an ice releasing position of the ice tray of the automatic ice making machine of FIG. 1;

FIG. 21 is a side view showing a water supply position state of an ice tray of the automatic ice making machine of FIG. 1;

FIG. 22 is a diagram showing an operation state of a modification of the driving method of the automatic ice maker according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic ice-making machine 2 Ice tray 3 Ice detection arm (ice detecting means) 4 Oscillating member (liquid supply operating means) 5 Drive device 7 Shaft (oscillating fulcrum) 8 Opening / closing valve (liquid supplying means) 9 Case 10 Cam gear (Cam) 11 Ice detection mechanism 12 Switch mechanism (signal output means) 13 Stepping motor (drive source) 14 Rotation transmission means 25 Output shaft 28 Ice detection shaft cam surface 29 Magnet lever cam surface 31 Ice detection shaft lever 31a Convex Part 32 ice detecting shaft 33 coil spring 34 arm 41 magnet lever 42 Hall IC 43 magnet swing inhibiting member 46 permanent magnet 52 controller (control means and signal detecting means)

Claims (6)

[Claims] 1. An output shaft driven by a drive source, an ice tray supported by the output shaft and rotationally driven by the drive source, an ice storage container for storing ice produced by the ice tray, Detecting means for detecting the presence or absence of ice in the ice storage container, and ice-making the liquid in the ice tray with the ice detecting position for detecting the presence or absence of ice in the ice storage container as a rotation position of the ice tray. An ice making position, and a method for driving an automatic ice making machine having an ice release position for releasing ice from the ice, wherein a signal is generated between the ice making position and the ice detecting position, and a switching position of the signal is generated. Is used as a reference point, driving is started from the current position toward this reference point at the time of the initial setting operation, and the ice making tray is returned to the ice making position by using the switching of the signal at the time of passing this reference point. The driving method of the automatic ice maker. 2. The method according to claim 1, wherein the signal is the same as the signal generated at the ice detecting position, and a time from the reference point to the ice making position is longer than a signal generated at the ice detecting position. The driving method of an automatic ice maker according to claim 1, wherein 3. The apparatus according to claim 2, wherein the signal is generated in all regions from the reference point to the ice making position, and when the signal is generated during the initial setting operation, the signal is generated toward the ice removing position. 3. The method of driving an automatic ice maker according to claim 1, wherein the ice tray is driven, and when the signal is not generated, the ice tray is driven toward the ice making position. 4. An output shaft driven by a drive source, an ice tray supported by the output shaft and rotationally driven by the drive source, and an ice storage container for storing ice produced by the ice tray. A method for driving an automatic ice maker having detection means for detecting the presence or absence of ice in the ice storage container, wherein the liquid in the ice tray is iced across an ice detection position for detecting the presence or absence of ice in the ice storage container. It has an ice making position and an ice releasing position for releasing ice that has been made, and when the ice tray is driven to rotate near the ice detecting position and near the ice making position, the length differs at each position. Signal output means for outputting the same signal of a predetermined length, and signal detection means for detecting the signal output by the signal output means, while the signal output means is outputting the signal near the ice making position The ice making position above The length from the ice making position until the signal is no longer output by driving the ice tray to the ice detecting position side is the length of the signal of the predetermined length output by the signal output means at the ice detecting position. When the signal is output at the start of the initial setting operation, the ice tray is once driven to the ice releasing position side, and after the signal is switched, the ice tray is reversed to rotate the ice tray to the ice making position. A method for driving an automatic ice maker, comprising: 5. The automatic ice making machine according to claim 4, wherein when the signal is not output at the start of the initial setting operation, the ice making tray is rotated toward the ice making position to return to the ice making position. Drive method. 6. A water supply position for supplying liquid to the ice making tray is provided at a position opposite to the reference point with respect to the ice making position and at a position where the ice making tray is rotationally driven. 6. The method for driving an automatic ice maker according to any one of claims 1 to 5.