JPH0565780B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for controlling the deicing operation of an ice maker that automatically produces irregularly shaped ice cubes such as spherical ice. In an automatic ice-making machine that closes a first ice-making compartment from below with a second ice-making compartment provided in a second ice-making compartment and produces ice blocks of a desired shape in an internal space defined in both ice-making compartments, ice removal is performed. The present invention relates to a deicing operation control method that can ensure that the obtained ice cubes remain in the first ice making compartment when the second ice making compartment is forcibly separated from the first ice making compartment during operation.

BACKGROUND OF THE INVENTION Automatic ice making machines that continuously produce regular hexahedral ice cubes, ice sheets of a required thickness, and other ice blocks are suitably used in various industrial fields depending on the purpose.
For example, as an ice maker for producing ice cubes, a large number of cube-shaped ice-making compartments are defined downward in the ice-making compartment, which can be opened and closed from below by a water tray, and ice-making water is poured into each compartment from the water tray. There is a so-called closed-cell method in which ice cubes are gradually formed in the ice-making chamber by injection into the ice-making chamber, and ice-making water is directly supplied to a number of ice-making chambers that open downward (through a water tray). A so-called open cell system is known in which ice cubes are formed in the small chamber.

In addition, as an ice-making machine that continuously produces ice sheets, an ice-making plate equipped with an evaporator connected to the refrigeration system is arranged at an angle, and ice-making water is supplied flowing down to the front or back surface of the ice-making plate. The flow-down method, which forms a sheet of ice on top, is widely used. Furthermore, there is an ice making method in which the sheet ice obtained by the ice making machine described above is crushed to obtain fine granular crushed ice, and an ice making method in which water flows down and freezes on the inner wall of the cooling cylinder to form an ice layer. An auger-type method is also used in which flaky ice is obtained by scraping it with the cutting blade of a rotating auger.

Problems to be Solved by the Invention As mentioned above, ice manufactured by various conventional ice making machines are all cube-shaped ice cubes, sheet ice, other flaky ice, and crushed ice.
Of these ice cubes, only the ice cubes mentioned above have the required shape and can be floated on drinks or used as cooling beds for various foodstuffs. (However, it cannot normally be used in its original size.) However, in recent years, coffee shops, restaurants, and other service facilities have sought to differentiate themselves from their competitors in various ways.
Hard efforts are being made to attract customers. One example of this is the trend of using spherical ice cubes instead of the conventionally widely distributed ice cubes, thereby offering customers immediate new changes.

This spherical ice is widely used for eating and drinking.
Ice cubes must be clear and transparent, with no cloudiness due to air inclusion, and must have high commercial value, and must be able to be manufactured in large quantities, but no automatic ice maker has hitherto existed that meets these requirements. Nakatsuta. Therefore, the inventor of the present application developed an ice making machine capable of producing large amounts of transparent and clear spherical ice, and obtained a mechanism that fully satisfies the above requirements. On April 29th, he filed a patent application for his invention, ``Automatic Ice Maker.'' (Unexamined Japanese Patent Publication No. 1
-Refer to Publication No. 196477) The ice-making machine according to the earlier application defines a number of first ice-making compartments that open downward, and includes a first ice-making compartment equipped with an evaporator on the back, and a second ice-making compartment that opens upward. Basically, the ice-making chamber is equipped with a second ice-making chamber defining a large number of small ice-making chambers, and during ice-making operation, the first and second ice-making chambers correspondingly close to define a spherical or other ice-forming space therein. is configured to do so. After performing ice making operation with this ice maker and producing ice blocks such as spherical ice in the space, it is necessary to shift to deicing operation and remove the ice blocks from both ice making compartments.

For this purpose, the second ice-making compartment, which closes the first ice-making compartment from below, is forcibly separated from the first ice-making compartment, but at this time, the ice cubes themselves are removed from the first and second ice-making compartments.
Since the inner surface of the ice-making chamber is firmly frozen, the order in which the ice is released from both ice-making chambers is important. When the lid is closed and the first and second ice-making compartments are heated simultaneously, the ice cubes that have been thawed from both ice-making compartments fall all at once as the second ice-making compartment is forcibly removed. In this case, inconvenient situations such as ice blocks getting caught and remaining in the second ice-making compartment, which is recessed in the second ice-making compartment and open upwards, or preventing the ice blocks from falling smoothly into the ice storage, may occur. arise.

Purpose of the Invention The present invention has been proposed in view of the above-mentioned drawbacks in order to suitably solve the problems. Another object of the present invention is to provide a deicing operation control method that ensures that the obtained ice blocks remain in the first ice-making compartment without dropping them all at once.

Means for Solving the Problems In order to overcome the above-mentioned problems and suitably achieve the intended purpose, the present invention includes an evaporator disposed inside the ice maker body and connected to the refrigeration system on the top surface, The first ice-making chamber has a number of recessed ice-making chambers on the bottom surface.
The ice-making chamber and a number of second ice-making chambers are rotatably supported inside the ice-making machine body and close the first ice-making chamber correspondingly from below during ice-making operation. A second ice-making compartment that separates from the first ice-making compartment to open the first ice-making compartment; and a heating means that is disposed in the second ice-making compartment and is energized during deicing operation; 1st and 2nd
In an automatic ice making machine that produces ice cubes of a desired shape by injection supplying ice to a small ice making chamber, control is performed to stop the operation of a compressor in a refrigeration system while the heating means is energized during deicing operation. Features.

Embodiment Next, a method for controlling the deicing operation of an automatic ice maker according to the present invention will be described below with reference to the accompanying drawings in relation to a device that can suitably implement the method. Furthermore, according to the automatic ice making machine according to the present invention,
In addition to the spherical ice 1 shown in FIG. 6a, it is also possible to produce diamond-cut polyhedral ice 2 as shown in FIG. 6b, but as an example, a case will be described in which a large number of spherical ices are continuously produced.

(About ice-making mechanism) FIG. 1 schematically shows the main ice-making mechanism of an ice-making machine in an ice-making state, which can suitably implement the de-icing operation control method according to the present invention. The ice-making compartment 10 basically includes an ice-making compartment 11 and a second ice-making compartment 12 that can be opened and closed from below. 1st ice making room 1
Reference numeral 1 denotes a rectangular structure made of a metal with good thermal conductivity, and is located above the inside of the ice maker casing (not shown).
A large number of first ice-making chambers 13, which are fixed at a predetermined angle and open downward, are recessed in a predetermined alignment pattern on the lower surface thereof. Each first ice-making chamber 13 is formed as a hemispherical recess, the diameter of which is, for example, 3 cm, and the depth of the recess is therefore 1.5 cm.
is set to .

An evaporator 14 made of a tube constituting a part of the refrigeration system (described later) shown in FIG. By operating the refrigeration system, the refrigerant is circulated through the evaporator 14, and the first ice-making compartment 11 is cooled down to below freezing point. Further, during deicing operation, by opening the hot gas valve HV in the control circuit shown in FIG. 5, hot gas can be supplied to the evaporator 14 and the first ice making chamber 11 can be heated.

An ice-making detection thermo Th ₁ is disposed at the top of a required first ice-making compartment 13 in the first ice-making compartment 11 . This ice-making detection thermometer _Th1 is interposed in the control circuit shown in FIG. 5, and during ice-making operation, its contacts ca are closed (contacts c-b are opened).
When the ice-making operation is completed, the contact c-a is set to be opened (the contact c-b is closed).
Further, a de-icing detection thermo Th ₂ is disposed at the top of another first ice-making compartment 13, and this de-icing detection thermo Th ₂
is set to open the contact only when the first ice-making compartment 13 is in a cooling state, and to close the contact when the ice is separated from the ice-making compartment 13 and the temperature rises.

A second ice-making compartment 12 is disposed directly below the first ice-making compartment 11, which closes the first ice-making compartment 13 diagonally from below during ice-making operation and opens the first ice-making compartment 11 during de-icing operation. ing. This second ice-making chamber 12 is also made of a metal with good thermal conductivity, and on its upper surface, a large number of second ice-making chambers 15 (consisting of hemispherical recesses corresponding to each of the first ice-making chambers 13) are arranged upward in a required alignment pattern. has been done. Second ice making compartment 15
For example, the diameter is 3 cm, and the depth of the recess is 1.5 cm.
is set to . Therefore, when the first ice making chamber 11 is closed by the second ice making chamber 12 from below, a spherical space with a diameter of 3 cm is defined inside both the small ice making chambers 13 and 15.

Further, an electric heater H for promoting ice removal is buried around the bottom of the second ice making chamber 15, and as will be described later in connection with the control circuit in FIG. 5, when the ice making operation is completed, the second ice making chamber 12 is The heater H is energized until the required temperature is reached. Furthermore, a through hole 12a of a required diameter is formed at the bottom of each second ice making chamber 15, and ice making water is supplied and unfrozen water is discharged from a distribution pipe 24, which will be described later, through this hole.

The upper end of the second ice making chamber 12 is attached to a bracket 45 which is tiltably pivoted via a pivot 16 to a fixed portion inside the housing of the ice making machine. If the second ice-making chamber 12 is rotated clockwise about the pivot 16, the first ice-making chamber 13
can be opened (see Figures 2 and 4),
Furthermore, by turning the ice making chamber 13 counterclockwise from the open state, the first ice making chamber 13 can be closed again. In addition,
An actuator motor AM shown in FIG. 1 is preferably used as the opening/closing means for the second ice making chamber 12, and a cam lever 17 and a lever piece 37 are commonly fixed to the rotating shaft of this motor AM.

Further, a coil spring 18 is elastically engaged between the tip 17a of the cam lever 17 and the front end of the second ice making chamber 12. The cam surface 17b formed at the base of the cam lever 17 is dimensioned so as to be able to engage with the side upper surface of the second ice making chamber 12 that closes the first ice making chamber 11. 1st ice making room 1
1 is provided with a changeover switch _S2 shown in the circuit diagram of FIG.
_S2 is switched from the contact a-b side to the contact a-c side.

On the back side of the second ice making chamber 12, a distribution pipe 24 including a pressure chamber 23 is arranged close to the second ice making chamber 12 with a slight gap.
A fountain hole 25 corresponding to each of the water fountains 5 and 5 is bored. Then, the second ice making compartment 12 is replaced with the first ice making compartment 11.
When the fountain holes 25 are closed, each of the fountain holes 25
It is configured to face the through hole 12a formed in the second ice making compartment 15 correspondingly.

Note that a water guide plate 47 is disposed on the lower surface of the distribution pipe 24 via a spacer 46, and a water guide plate 47 is provided on the lower surface of the distribution pipe 24 to
It extends parallel to the lower surface of 2. This water guide plate 4
7 is a through hole 12 of the second ice making chamber 15 during ice making operation.
This is to collect the unfrozen water that falls from a and guide it to the ice-making water tank 19 below. In addition, a temperature detection thermometer Th ₃ is installed at the required part of the second ice making compartment 12.
is arranged so that the temperature of the second ice making compartment 12 can be monitored.

As shown in FIG. 1, the ice-making water tank 19 is located below the housing of the ice-making machine, and is located in the first and second ice-making compartments 1.
1 and 12, and has an inclined surface 19a extending obliquely upward from the tank body. As shown in the figure, it is preferable that a second water guide plate 48 be interposed between the inclined surface 19a and the water guide plate 47 in an inclined manner. Said second water guide plate 48
The lowermost edge thereof is bent downward and faces above the upper end of the inclined surface 19a, and unfrozen water is guided to the inclined surface 19a via this bent edge, and the ice blocks during deicing are can slide down on the second water guide plate 48 and be collected in the ice storage. In addition, the water supply pipe 21 led out from the bottom side of the ice-making water tank 19
is communicated with the pressure chamber 23 via a water supply pump 22, and water is supplied to the tank 19 through a water supply valve.
Opening of the WV is done via the water supply pipe 27 connected to the external water system.

(About the refrigeration system) Fig. 3 shows a schematic configuration of the refrigeration system in the ice maker. The vaporized refrigerant compressed by the compressor CM passes through the discharge pipe 34, is condensed and liquefied in the condenser 28, and is then transferred to the dryer. After being dehumidified in step 29, the pressure is reduced in the capillary reach tube 30, and it flows into the evaporator 14 where it expands and evaporates all at once, exchanging heat with the first ice making chamber 11, and forming the first ice making chamber 11. 13 is cooled to below freezing. The vaporized refrigerant evaporated in the evaporator 14 and the unevaporated liquefied refrigerant flow into the accumulator 31 in a gas-liquid mixed phase state, where they are separated into gas and liquid. The gas phase refrigerant then returns to the compressor CM through the suction pipe 32, and the liquid phase refrigerant is stored in the accumulator 31.

Furthermore, a hot gas pipe 33 is branched from the discharge pipe 34 of the compressor CM, and this hot gas pipe 33 is communicated with the inlet side of the evaporator 14 via a hot gas valve HV. This hot gas valve HV is controlled to open only during deicing operation and close during ice making operation. In other words, during deicing operation, the hot gas valve
When the HV is opened, the high temperature refrigerant discharged from the compressor CM is sent to the evaporator 1 via the hot gas pipe 33.
4 and heats each first ice-making chamber 13, the circumferential surface of the spherical ice produced inside the chamber is melted, and each ice block is caused to fall by its own weight. Further, the high temperature refrigerant flowing out from the evaporator 14 flows into the accumulator 31, heats and evaporates the liquid phase refrigerant staying in this accumulator 31, and returns it to the compressor CM from the suction pipe 32 as a gas phase refrigerant. let Note that the symbol FM in the figure indicates a fan motor for the condenser 28.

(Regarding Electrical Control Circuit) An example of a control circuit for operating the device according to this embodiment is shown in FIG. In the figure, a fuse F and an ice accumulation detection switch _S1 are provided in series between the power supply line R and the connection point D.
A compressor CM is connected between the power supply line T and the power supply line T via a normally closed contact X-b of a relay X.
Further, during the deicing operation, the terminal a of the changeover switch _S2 , which is energized by the tilting of the second ice-making chamber 12, is connected to the connection point D, and the changeover contact b of the changeover switch _S2 is connected to the ice-making detection thermometer _Th1. is connected to contact c.

A driving motor PM of the pump ₂₂ and a fan motor FM are connected in parallel between the contact a of the ice-making detection thermometer Th 1 and the line T, and the contact b of the thermometer Th ₁ is connected to the contact a of the temperature detection thermometer Th ₃ . A relay X and a heater H are connected in parallel between the switching contact b of the thermometer _Th3 and the line T, respectively. Further, the other switching contact c of the temperature detection thermometer _Th3 is connected to the tilting drive terminal m of the actuator motor AM. Furthermore, the motor
Terminal k of AM is connected to line T, and its return drive terminal n is connected to changeover contact c of changeover switch _S2 via contact of deicing detection thermometer _Th2 . Also, the switching contact c of the switching switch _S2
A hot gas valve HV and a water supply valve WV are connected in parallel between and the line T.

Effects of the Embodiment Next, a method of controlling the deicing operation performed by operating the automatic ice maker described above will be described.

(Start of ice-making operation) First, power is turned on to the automatic ice-making machine (the power switch is not shown). At this time, since no ice is stored in the ice storage, the ice storage detection switch _S1 is closed, and the changeover switch _S2 is connected to contacts a and b.
connected to the side. Further, since the temperature of the first ice making chamber 11 is maintained at about room temperature, the ice making detection thermo _Th1 is connected to the contact ca side. Therefore, when the power is turned on, the compressor CM and fan motor
FM and pump motor PM are started to be energized, ice making operation begins, and first ice making chamber 11 is cooled. In addition, the ice-making water 20 from the ice-making water tank 19 is pumped to the distribution pipe 24, and the ice-making water 20 is pumped to the distribution pipe 24, and the ice-making water 20 is pumped to the distribution pipe 24, and the ice-making water 20 is fed through the water fountain holes 25 in the distribution pipe 24 and the through hole 12a drilled in the second ice-making chamber 12. is injected into each second ice making compartment 15.

The injected ice-making water comes into contact with the inner surface of the first ice-making chamber 13 and is cooled, moistening the second ice-making chamber 15 in the second ice-making chamber 12 located below. The ice-making water falls through the through hole 12a into the water guide plate 47, and further passes through the second water guide plate 48 and the inclined surface 19a to the ice-making water tank 1.
9 and subjected to circulation again. As this ice-making water circulation is repeated, the overall temperature of the ice-making water stored in the tank 19 gradually decreases. Also the second
The ice making room 12 is partially connected to the first ice making room 11.
Since the cooled unfrozen water contacts and circulates in the second ice making compartment 15, the temperature of the second ice making compartment 12 itself also gradually decreases to below the freezing point. First, the first ice making compartment 1
A part of the ice-making water freezes on the inner wall surface of the ice-making water tank 19 to form an ice layer, and the unfrozen water returns to the ice-making water tank 19 through the through hole 12a which also serves as a return hole. As the growth progresses further, spherical ice 1 is gradually generated in the spherical space defined by the first ice-making chamber 13 and the second ice-making chamber 15.

(Completion of ice making and transition to deicing operation) In this way, when the ice making in the first ice making chamber 13 and the second ice making chamber 15 is completed and the temperature of the first ice making chamber 11 falls to the required temperature range, Upon detecting this, the ice-making detection thermometer _Th1 switches from the contact ca side to the contact c-b side, and energization to the fan motor FM and pump motor PM is stopped (see timing chart in FIG. 7). Also, the second ice making room 12
has fallen below the required temperature due to the formation of spherical ice 1, so the temperature detection thermometer _Th3 is connected to contact a-
Therefore, the relay X is energized and excited to open the normally closed contact X-b, and the operation of the compressor CM is also stopped. As a result, the circulation of the refrigerant to the evaporator 14 is stopped, and forced cooling of the first ice-making chamber 11 is no longer performed. Further, energization to the heater H is started to heat the second ice making chamber 12,
Due to the heat conduction, the spherical ice 1 in the second ice making compartment 15
The bonding force between the obtained spherical ice 1 and the second ice-making chamber 15 is reduced by melting the ice.

Next, when the temperature of the second ice making chamber 12 rises to a predetermined value or higher due to heating by the heater H, the temperature detection thermometer _Th3 detects this and closes the contact a-
Switch b to contact a-c side. As a result, relay X is deenergized and normally closed contact X-b is closed, and the compressor CM
At the same time, the power supply to the heater H is stopped. In addition, electricity is supplied through the tilting drive terminal m of the actuator motor AM, and by driving the motor AM, the cam lever 1
7 rotates, and the cam surface 17b formed on the base forcibly presses the side upper surface of the second ice making chamber 12 downward. As already mentioned, since the spherical ice in the second ice-making compartment 15 has been thawed, the second ice-making compartment 12 is forcibly separated from the first ice-making compartment 11.
It begins to tilt clockwise. And finally the second
As shown in FIGS. 2 and 4, the ice making compartment 12 is
Fully open in a hanging state.

At this time, the spherical ice 1 is still frozen and fixed in the first ice-making compartment 13 in the first ice-making compartment 11 .
At the timing when the second ice making chamber 12 is tilted to its maximum extent, the lever piece 37 is activated as a changeover switch.
_S2 is pressed and energized, and its contacts a and b are switched to contacts a and c. This opens the water supply valve WV,
New ice-making water is supplied to the ice-making water tank 19, and the hot gas valve HV is opened to circulate the high-temperature refrigerant (hot gas) discharged from the compressor CM, which has already resumed operation as described above, to the evaporator 14. Let it be supplied. Therefore, the first ice-making chamber 11 is heated by the hot gas, and the frozen surfaces of the inner surface of the first ice-making chamber 13 and the spherical ice begin to melt. Note that since the de-icing detection thermo _Th2 maintains its open state, a return command for the actuator motor AM is not issued yet.

In addition, due to the circulation of hot gas in the evaporator 14,
When the first ice-making chamber 13 is heated, as shown in FIG. 2 and FIG. It slides down along the second water guide plate 48 and is guided and collected in an ice storage (not shown).

In this way, when all the spherical ice leaves the first ice making compartment 13, the temperature of the first ice making compartment 11 rises all at once due to the hot gas circulating in the evaporator 14. When the deicing detection thermometer Th ₂ detects this temperature rise, the thermometer Th ₂ is closed and the return drive terminal n of the actuator motor AM is energized. As a result, the motor AM rotates in the opposite direction to drive the cam lever 17.
The coil spring 18 elastically engaged between the second ice making chamber 12 and the ice making chamber 12 rotates and urges the second ice making chamber 12 in the counterclockwise direction to return to the tilted state. 13 is closed diagonally from below.

Incidentally, due to the reverse rotation of the motor AM, the cam lever 17 also rotates in the reverse direction, and presses and energizes the changeover switch _S2 to switch from the contact ac side to the contact ab side. As a result, the water supply valve WV and the hot gas valve HV are closed, and the supply of ice-making water and hot gas is stopped. The ice-making operation is then resumed by returning to the initial state, and the above-described operations are repeated. When the ice making operation and the ice removal operation are repeated and a predetermined amount of spherical ice is stored in the ice storage, the ice storage detection switch _S1 is opened and the operation of the ice maker is stopped (FIG. 7).

In the illustrated example, an electric heater H is used as a heating means, and a combination of an ice-making detection thermometer Th ₁ , a temperature detection thermometer Th ₃ , and a relay X is used to stop the operation of the compressor CM and energize the electric heater H. However, the invention is not limited to this. For example, a timer may be incorporated into the control circuit, and the timer may provide control such that the electric heating of the electric heater H is performed only for a certain period of time.

Furthermore, the ice-making mechanism that automatically produces irregularly shaped ice cubes such as spherical ice is not limited to the structure in which the first ice-making compartment is arranged at an angle inside the machine, as shown in the figure, but the first ice-making compartment is arranged horizontally inside the machine. the first
A structure that rotatably closes the ice-making compartment from below, etc.
Various forms can be suitably adopted. That is, the first
and a second ice-making chamber, and the generated ice cubes are stored in the second ice-making compartment.
The deicing operation control method according to this embodiment can be applied to any automatic ice maker, as long as it is of a type in which the ice maker is detached first and a heating means is provided in the second ice maker. It is applicable.

Effects of the Invention As explained above, according to the deicing operation control method according to the present invention, an ice making machine that automatically produces irregularly shaped ice blocks such as spherical ice, for example, a first ice making compartment provided in a first ice making compartment, , in an automatic ice making machine that is closed from below by a second ice making compartment provided in the second ice making compartment and produces ice cubes of a desired shape in the internal space defined in both ice making compartments, when the second ice making compartment is closed during deicing operation. Control is preferably performed to stop the operation of the compressor in the refrigeration system while the heating means disposed in the ice making compartment is energized. Therefore, the second ice-making compartment can be forcibly separated from the first ice-making compartment while the ice cubes are reliably left in the first ice-making compartment.

That is, instead of heating the first and second ice-making compartments simultaneously during deicing operation, while the second ice-making compartment is being heated by the heating means, refrigerant and hot gas are supplied to the evaporator installed in the first ice-making compartment. Since control is provided to prevent any circulation, even if the second ice-making compartment is forcibly separated from the first ice-making compartment for deicing, the ice cubes still remain in the first ice-making compartment in a frozen state. Therefore, even if the second ice-making compartment is tilted, falling ice cubes may get caught and remain in the second ice-making compartment that opens upward to the second ice-making compartment, and ice cubes may not be deposited into the ice storage. Inconvenient situations such as a smooth fall being hindered can be effectively avoided.

[Brief explanation of the drawing]

FIG. 1 is a front partial vertical cross-sectional view showing a schematic configuration of an automatic ice maker that can suitably implement the deicing operation control method according to the present invention, and FIG. 2 is a second ice maker in the ice maker shown in FIG. Figure 3 is a schematic perspective view showing the chamber open, Figure 3 is a circuit diagram of a general refrigeration system in an automatic ice maker, Figure 4 is a front view with the second ice maker open, and Figure 5 is a diagram showing the implementation. Circuit diagram showing an example of an ice-making control circuit for controlling the operation of the ice-making machine according to the example, No. 6
Figure a is an explanatory diagram showing spherical ice, Figure 6 b is an explanatory diagram showing multifaceted ice, and Figure 7 is the timing when the ice making apparatus according to the embodiment is controlled by the ice making control circuit shown in Figure 5. It is a chart diagram. 11...First ice making room, 12...Second ice making room, 1
3...First ice making compartment, 14...Evaporator, 15...
Second ice making compartment, H... heating means (electric heater),
CM...Compressor.

Claims (1)

[Scope of Claims] 1. A first ice-making chamber 1 which is disposed inside the ice-making machine body and includes an evaporator 14 connected to the refrigeration system on the upper surface, and a number of first ice-making chambers 13 recessed on the lower surface.
1, a plurality of second ice-making chambers 15 are rotatably supported inside the ice-making machine body, and which close the first ice-making chamber 13 correspondingly from below during ice-making operation; a second ice-making compartment 12 that separates from the first ice-making compartment 11 to open the first ice-making compartment 13; and a heating means H disposed in the second ice-making compartment 12 and energized during deicing operation. In an automatic ice making machine which produces ice cubes of a desired shape by injecting ice making water into the first and second ice making compartments 13 and 15, while the heating means H is energized during the deicing operation, A deicing operation control method for an automatic ice maker, characterized by controlling the operation of a compressor CM in a refrigeration system to be stopped.