JP3533360B2 - Commercial rice cooker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial rice cooker used for mass cooking rice in a catering company. 2. Description of the Related Art FIG. 7 is a schematic diagram showing a state of use of a conventional commercial rice cooker. A commercial rice cooker (85) is interposed between the downstream end of the carry-in conveyor (80) and the upstream end of the carry-out conveyor (86), and the commercial rice cooker (85) has a plurality of rice cookers. The rice cooking units (71) (71) are arranged in two rows. Each of the rice cooking units (71) and (71) has a built-in heating source for heating the inner pots (93) and (93) attached to and detached from them, and an individual control device for controlling the heating source. Have been. Also, above the commercial rice cooker (85), rails (94) (9)
A crane (92) moving along 4) is provided. In this apparatus, inner pots (93) and (93) supplied by a carry-in conveyor (80) are temporarily stocked at a rice cooker inlet (851) located at a downstream end of the carry-in conveyor (80). At the same time, the stocked inner pots (93) and (93) are conveyed by a crane (92) and sequentially set in the rice cooking units (71) and (71) of the commercial rice cooker (85), and the rice cooker after the rice cooking is completed. The kettles (93) and (93) are taken out of the rice cooking units (71) and (71) by the crane (92) and transported to the rice cooking outlet (852). Then, the inner pots (93) and (93) transported to the rice cooking exit (852) are then transported downstream by the unloading conveyor (86). [0004] However, in the above conventional apparatus, the inner pot (93) for the rice cooking units (71) (71) is not provided.
There was a problem that the putting in and out of (93) could not be performed quickly.
In the above conventional apparatus, the crane (92) takes out the inner pot (93) after the completion of rice cooking from the specific rice cooking unit (71) and outputs the rice cooker outlet.
(852), return to the rice cooker entrance (851), hold a new uncooked inner pot (93), transport it to the specific rice cooker unit (71), and set it in this cycle It is necessary to perform the operation of. The traveling distance traveled by the crane (92) when performing this one-cycle operation is at least as long as the reciprocating distance between the rice cooker inlet (851) and the rice cooker outlet (852) of the commercial rice cooker (85). Required. However, in the conventional example, the rice cooker (85) performs a one-cycle operation because the rice cooker inlet (851) and the rice cooker outlet (852) are formed at positions separated by the two ends. Above crane (9
The travel distance of 2) becomes longer, and accordingly, the quickness of the work of attaching and detaching the inner pots (93) and (93) is hindered. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in consideration of the following problem. A "housing for accommodating an inner cauldron detachably and open upwardly" and a heater for heating the inner caulder accommodated in the cauldron accommodating portion are provided. The rice cooker includes a plurality of rice cooking units each including a heating source and an individual control device that controls the heating source, and replaces an inner pot contained in the pot accommodating portion of the cooked rice cooking unit with a non-cooked inner pot. The purpose of the present invention is to provide a commercial rice cooker that enables the internal cooker to be put in and taken out through a common kettle loading / unloading station, thereby enabling quicker attaching / detaching work of the inner cooker. And [0006] The technical means of the present invention for solving the above-mentioned problems is as follows: "The rice cooker after the rice cooker is taken out of the rice cooker unit and the rice cooker from which the inner cooker is taken out." A rice-cooking unit transfer device that circulates and moves each of the rice-cooking units along a closed-loop circulation path that passes through a kettle loading / unloading station that sets an inner pot of uncooked rice;
A control device for temporarily stopping the rice-cooking unit transfer device each time a specific rice-cooking unit having finished cooking reaches the kettle loading / unloading station, wherein the rice-cooking unit transfer device has a vertical rotation axis. And a unit holder that holds the plurality of rice cooking units in a manner arranged on a circle around the rotation axis, and a motor that rotates the unit holder around the rotation axis. In the unit holder, a plurality of swing arms long in the radial direction of the circle are arranged at an arrangement pitch of the rice cooking unit, and at each of the swing end portions, which are outer end portions of each of the swing arms, are provided. Is provided with a steam temperature sensor for separately detecting the temperature of steam discharged from a steam hole passing through the center of the lid covering the inner kettle, and detecting the temperature of each inner kettle by the detected temperature of the steam temperature sensor. The rice progress to determine on an individual basis. "
That is. The above technical means operates as follows. A rice cooking unit provided with a heating source for heating the inner pot is moved along a closed loop circulation path by a rice cooking unit transfer device. Specifically, the unit holder is rotated about the rotation axis by rotation of the motor, whereby the rice cooking unit provided on the unit holder is moved along a circular closed loop. On the other hand, when the individual control device of the rice cooker unit is operated in a state where the inner cooker is set in each rice cooker unit, the inner cooker is heated by the heating source and the rice cooking operation proceeds. Eventually, when the rice cooking unit that has moved along the closed loop circulation path has reached the rice cooker loading and unloading state and reaches the cooking station, the rice cooking unit transfer device is temporarily stopped. This makes it possible to take out the rice cooker after cooking is completed from the rice cooker unit stopped at the kettle loading / unloading station, and to set a new rice cooker of uncooked rice in the rice cooker unit stopped at the kettle loading / unloading station. Can be. That is, according to the above technical means, it is possible to put the inner kettle in and out of the rice cooker unit through the common kettle loading / unloading station, and the rice cooker entrance (8
The distance between the rice cooker (852) and the rice cooker outlet (852) is larger than that of the above-described conventional rice cooker for business use, so that the work of attaching and detaching the inner pot can be speeded up. [0010] The present invention having the above-described configuration has the following specific effects. The inner kettle can be put in and taken out of the rice cooker unit through the common kettle loading / unloading station, and the distance between the rice cooker inlet (851) and the rice cooker outlet (852) is larger than that of the above-mentioned conventional commercial rice cooker. Work can be accelerated. Next, an embodiment of the present invention will be described. [Base Technology] FIG. 1 is a commercial rice cooker which is a base technology of an embodiment of the present invention.
It is a whole perspective view of the continuous rice cooker incorporating (5). Between the carry-in conveyor (21) and the carry-out conveyor (22), a shuttle transfer device (40) is provided.
A commercial rice cooker (5) of the base technology is arranged beside (40). As shown in FIG. 2, the commercial rice cooker (5)
Is a cylindrical base placed on the floor (10) and open at the top
(51), and a flange (53) for receiving support rollers (52) (52), which will be described later, is provided around the upper edge of the base (51). A column (54) is provided on the center line portion (vertical axis of rotation described above) of the base (51), and the column (54) is provided with bearings (55) and (55). The rotary cylinder (56) is rotatably mounted, and the outer ends of the support legs (57) (57) extending radially from the lower end of the rotary cylinder (56) have the above-mentioned flange portion (53). The running support rollers (52) and (52) are provided. The supporting legs (57) and (57) are coaxially provided with the intermediate drum (5) so as to surround the rotary cylinder (56).
8), and a roller chain (68) is wound around the outer periphery of the lower end of the intermediate drum (58). The roller chain (68) is engaged with a sprocket (73) attached to a rotating shaft of a servomotor (72). A disk-shaped unit holder (50) is supported by the upper end of the intermediate drum (58).
On the outer periphery of the unit holder (50), a rice cooking unit (6
1) (61) are arranged at a constant angular pitch in the circumferential direction. The intermediate drum (58) is a servo servo motor.
When rotated by (72), the unit holder (50) supported at the upper end of the intermediate drum (58) becomes a rice cooking unit (61) (61)
The rice cooker units (61) are configured to rotate intermittently in units of the arrangement pitch of the rice cookers (61) in a state of holding. Accordingly, in the base technology, a rice cooking unit transfer device is configured by a combination of the unit holder (50), the intermediate drum (58), the servomotor (72), and the like. In the rice cooker unit (61), a bottom of the rice cooker (93) formed in the rice cooker unit (61) and configured to detect the temperature of the bottom of the inner cooker (93) set in the cooker container (78) that is open upward. Temperature sensor (6
2), an inverter circuit (63) for applying a high-frequency current to a heating coil (79) for heating the inner pot (93), and an inverter circuit (63) based on a signal indicating the temperature detected by the pot bottom temperature sensor (62). An individual control device (64) for controlling the inverter circuit (63), and a kettle detection sensor (65) for detecting that the inner pot (93) is set in the rice cooking unit (61) are further provided. In the vicinity of the center of rotation of the upper surface of the unit holder (50), a temperature receiver (59) (59) for receiving a signal from a steam temperature transmitter (67) (67) described later.
The temperature receivers (59) and (59) are connected to the lead wire (6).
6) Individual control device for each rice cooking unit (61) (61) via (66)
(64) Connected to (64). The outer ends of the support plates (69) (69) projecting radially from the upper ends of the above-mentioned columns (54) are fixed to the lower surface of the steam hood (31) having a fan shape in plan view. The steam hood (31) has a shape that opens downward and gradually rises from the outer periphery toward the center. A duct connecting tube (32) for connecting an exhaust duct (not shown) protrudes from the center of the upper surface of the steam hood (31). On the lower surface of the steam hood (31), steam guides (33) (33) extending from the outer peripheral portion toward the center are spaced at the same pitch as the rice cooking units (61) (61) in the circumferential direction. It is placed and placed. Each steam guide (33) has an inverted U-shaped cross section that opens downward, and each steam guide (3)
3) includes a steam temperature sensor (70) for detecting the temperature of steam discharged from a steam hole (35) passing through a knob (34) provided at the center of a lid (95) covering each inner pot (93). ) Is provided. A signal indicating the temperature detected by the steam temperature sensors (70) (70) disposed on the steam guides (33) (33)
The power is transmitted to the steam temperature transmitters (67) (67) fixed to the outer periphery of the support (54) via the (0) (60). Then, the signal indicating the detected temperature is separately transmitted from the steam temperature transmitters (67) and (67) to the temperature receivers (59) and (59) on the unit holder (50) located below these. The transmission signal is further transmitted to the individual control devices (64) (64) of the rice cooking units (61) (61) via the lead wires (66) (66). still,
Each of the individual control devices (64) stores in advance a plurality of rice cooking heating patterns indicating a temporal change in an amount (heat generation amount) of heating the inner pot (93) by the heating coil (79). By operating a main controller (not shown), a specific rice heating pattern can be selected from each of the rice heating patterns. As shown in FIGS. 1 to 3, the carry-in conveyor (2
Hook transfer device (4) interposed between 1) and unloading conveyor (22)
Rotation having a pair of holding arms (42) (42) opened and closed by an opening / closing drive source (not shown) so as to engage with the upper end flange (99) of the inner hook (93) from below. It has a head (43).
As shown in FIG. 2, the rotating head (43) is
And is supported by a support shaft (44) projecting downward from
The support shaft (44) is rotated integrally with the rotary head (43) by a swing motor (45). Also, the support shaft (44)
Is raised and lowered by a lifting drive source (46). Accordingly, the holding arms (42) and (42) are opened and closed by an opening / closing drive source (not shown), the support shaft (44) is rotated by the swing motor (45), and the support shaft (44) is further moved up and down by the elevation drive source ( When it is raised and lowered in 46), the position closest to the shuttle transfer device (40) (the shuttle transfer device (40)
Take out the inner pot (93) from the specific rice cooker unit (61) in the nearby kettle loading / unloading station) while holding the inner pot (93) with the holding arms (42) and (42), and after cooking the rice, carry out the conveyor (22) on the process section side.
Can be drained on. Also, by opening and closing the holding arms (42) and (42) and rotating the support shaft (44), the specific rice cooking unit (6
The inner pot (93) on the carry-in conveyor (21) can be put into 1). The unloading conveyor (22) is covered with a tunnel-type covering member (25) made of a heat insulating material, and is covered with inner pots (93) and (93) immediately after the completion of rice cooking (covers (95) and (95)). Is passed through the cover member (25), and is kept hot and steamed. Next, the operation of the commercial rice cooker will be described. When the inner pot (93) (93) (filled with rice grains and water) covered by the lids (95) (95) is transported to the pot transfer device (40) by the carry-in conveyor (21) The inner pots (93) and (93) are set in a commercial rice cooker (5) by a pot transfer device (40) and cooked by heating. FIG. 4 is a flowchart for explaining the operation of the commercial rice cooker (5). When the inner kettle (93) taken out of the carry-in conveyor (21) by the kettle delivery device (40) is put into the rice cooking unit (61) at the kettle loading / unloading station (the position closest to the kettle delivery device (40)), FIG. Output an ON signal. Then, the control operation shifts from step (ST1) to step (ST2) in FIG.
The servomotor (72) starts rotating in response to the N signal. Then, the intermediate drum (58) is engaged with the sprocket (73) and the roller chain (68) to move the unit holder (50).
At the same time, the unit holder (50) is rotated in the clockwise direction indicated by the arrow in FIG. 3, whereby the unit holder (50) is rotated by an angle corresponding to the arrangement pitch of the rice cooking units (61) and (61). In step (ST2), the individual control device (64) of the rice cooking unit (61)
Controls the inverter circuit (63) to heat the inner pot (93)
At (79), weak heating is started, and thereafter, when the temperature detected by the kettle bottom temperature sensor (62) reaches 80 ° C., the output of the heating coil (79) is increased, and the inner kettle (93) is strongly heated. Every time the inner pot (93) was set in the rice cooker unit (61) in the kettle loading / unloading station, the unit holder (50) was intermittently rotated in the arrangement pitch unit described above, and was set in the rice cooker unit (61). The inner pot (93) is heated by the heating coil (79), and the inside of the inner pot (93) is gradually boiled. When the inside of the inner pot (93) boils, the rice cooking unit (61) in which the inner pot (93) is set reaches below the first steam temperature sensor (70a) provided in the steam hood (31). Then, the steam generated from the inner pot (93) (pick the lid (95) (34)
The steam is discharged from the steam hole (35) formed in the nozzle. ) Is detected by the first steam temperature sensor (70a). Thereafter, as the unit holder (50) rotates intermittently, the inner pot (93) moves from the first steam temperature sensor (70a) to the second steam temperature sensor (70b) to the third steam temperature sensor (70c). These are sequentially opposed from below. Then, when the temperature of the steam detected by the first steam temperature sensor (70a) or the like reaches 70 ° C., step (ST5)
Then, the control proceeds to step (ST6) to reduce the output of the heating coil (79), whereby the inner pot (93) is weakly heated.
At this time, the rice cooker unit (61) with the weakly heated inner pot (93) set therein reaches below the location of the second steam temperature sensor (70b) or the third steam temperature sensor (70c). are doing. When the temperature of the steam discharged from the inner pot (93) reaches the above-mentioned 70 ° C., the rice cooking unit (61) in which the inner pot (93) is set is connected to the second steam temperature sensor (70b) or the third steam temperature sensor (70b). The rotation speed of the servo servomotor (72) is set so as to reach below the portion where the steam temperature sensor (70c) is provided. Eventually, the water in the inner pot (93) evaporates almost, and the temperature in the pot detected by the pot bottom temperature sensor (62) becomes 140 ° C, and when the rice cooking is completed, control is performed from step (ST7) to step (ST8). Is moved to stop the heating operation by the heating coil (79). At this time, if the rice cooker unit (61) in which the rice cooker (93) in the cooked rice finished state has not been moved to the kettle loading / unloading station (the closest position of the kettle delivery device (40)), the rice cooker is The unit holder (50) is rotated until the unit (61) moves to the shuttle loading / unloading station, and thereafter the rice cooker end signal is output from the individual controller (64). Then, the rice-cooking completion signal is transmitted to the kettle transfer device via a transmitter (not shown).
The rice cooker delivery device (40) removes the rice cooker (93) in the rice cooked state from the rice cooker unit (61) and places it on the carry-out conveyor (22). Further, the shuttle transfer device (40) takes out the uncooked inner cooker (93) from the carry-in conveyor (21) and sets it in the rice cooker unit (61) at the above-described cooker loading / unloading station. [Modification of Prerequisite Technology] Next, a “modification of the prerequisite technology” shown in FIG. 5 will be described. In this apparatus, an auxiliary table (500) having a common rotation axis is provided above the unit holder (50),
The hook receiving portions (507) and (507) formed on the auxiliary table (500) and the hook receiving portions (78) and (78) formed on the unit holder (50)
They are arranged to face up and down. The rice cooker units (61) and (61) provided on the unit holder (50) have inverter circuits (79) and (79) corresponding to the heating coils (79) and (79) mounted on the rice cooker units (61) and (61). 63) and the individual control device (64), an inverter circuit (503) for the heating coil (791) arranged on the auxiliary table (500) and the individual control device (504) are also stored. ing.
Then, the inverter circuit (503) and the individual control device (504)
Except that it is also stored in the rice cooking unit (61) (61)
The unit holder (50) is the unit holder (5
0). The steam hood (31) arranged on the upper adjacent portion of the unit holder (50) is a steam hood (3) shown in FIG.
The steam hood (3) has substantially the same configuration as (1).
1) is fixed to a hood support leg (38) via a support arm (39). Then, the steam hood (31) is mounted on the strut (54) with the bearing (5
5) It is externally fitted at a predetermined interval to a rotatable cylinder (56) rotatably mounted via (55). Therefore, the bearing
(55) Auxiliary table (500) and unit holder (50) with rotating cylinder (56) rotatably coupled to support (54) via (55)
The steam hood (31) is not
(500) and the unit holder (50) do not rotate together. At the outer periphery of the auxiliary table (500) fixed to the upper end of the rotary cylinder (56), a shuttle housing (507) for accommodating the inner shuttle (93) is formed. A heating coil (791) for heating the inner pot (93) and a pot bottom temperature sensor (508) are contained in the containing section (507), and these pot bottom temperature sensors (508) are provided.
And heating coil (791) is a rice cooker unit located just below
It is electrically connected to the individual control device (504) and the inverter circuit (503) provided in (61) via the lead wires (24) and (26) and the rotary connector (25). Thus, the output of the heating coil (791) on the auxiliary table (500) side can be controlled via the individual control device (503) and the inverter circuit (503). An upper steam hood (32) having the same structure as the steam hood (31) is provided above the auxiliary table (500).
0) is disposed, and the upper steam hood (320) has the same shape as the steam guides (33) and (33) of the steam hood (31) and is located just above these steam guides (33) and (33). The steam temperature sensor (700) provided in each of the steam guides (330) and (330) is provided with a steam temperature transceiver (not shown) (the steam temperature transmitter described above). (67) and temperature receiver (5
9)) and a rice cooker unit (6) located below the steam temperature sensor (700).
It can be transmitted to the individual control device (504) in 1). In this apparatus, when the auxiliary table (500) and the unit holder (50) are integrally rotated by the servo motor (72), the heating control as described in the above-described prerequisite technology is performed by the individual control device. (64) and (504) are executed, whereby the inner hooks (93) and (93) set on the auxiliary table (500) and the inner hooks (93) and (93) set on the unit holder (50) are removed. The heating coils (79) and (791) to be heated are individually controlled by the individual control devices (64) and (504). As a result, similarly to the above-described prerequisite technology, the servo motor is operated so that the rice cooker (93), in which the rice cooking progresses and finally ends the rice cooking, can be moved to the vicinity of the cooker transfer device (40).
The rotation of (72) is controlled. Then, when the auxiliary tables (500) arranged in the upper and lower stages and the inner pots (93) (93) held by the unit holder (50) reach the vicinity of the hook transfer device (40), they are moved up and down. Of the lined inner pots (93) and (93), the upper or lower inner pot (93), which has been previously cooked, is taken out by the pot transfer device (40), and the inner pot (93) is taken out by the unloading conveyor. (22). In addition, as the rotating head (43) of the shuttle transfer device (40) rotates and moves up and down, the lower or upper inner cooker (93), which is in a state where the rice cooking has been completed thereafter, is taken out, and this is taken out by the unloading conveyor (22). Transferred to. [Embodiment] Next, the structure and the like of a commercial rice cooker according to an embodiment of the present invention will be described with reference to FIG. In the figure, the same parts as those of the base technology are denoted by the same reference numerals. In this case, steam temperature sensors (70) (70) that rotate integrally with the unit holder (50) are provided. That is, the center support (54)
In the upper part of the rotary cylinder (56) rotatably mounted with bearings (55) and (55), a sensor unit (13) including a steam temperature sensor (70) (70) and a unit Body (50) is attached. The sensor unit (13) has a circular plate (14) projecting from the upper end of the rotary cylinder (56) to the outer periphery, and a predetermined angular pitch on the outer periphery of the circular plate (14) (rice cooking units (61) (61) Arrangement pitch)
The supporting brackets (15) and (15) are provided with the swinging arms (16) and (16). It is rotatably mounted. A steam collecting umbrella (18) is provided at the tip of the swing arm (16).
(18) and a steam temperature sensor (70) (70) at the center thereof. A guide ring (82), which is formed into an annular shape in plan view, is connected to the upper end of the support (54) via a connection arm (83). The guide ring (82) has a certain angle range bent downward on the side of the shuttle transfer device (40) so that the swing arm (16) can be moved so that its output side end is raised. It has become. In this case, as described above, the unit holder (50) and the sensor unit (13) are fixed to the common rotary cylinder (56) and are configured to rotate integrally. Therefore, the temperature of the steam discharged from the inner pots (93) (93) stored in the pot storing sections (78) and (78) of the rice cooking units (61) and (61) is the same as that of the inner pots (93) and (93). (93) Steam temperature sensor corresponding to each (70)
(70) is monitored individually and constantly. This allows each inner pot (9
3) The rice cooker in (93) is individually judged and the heating coil (7
Adjust the heating amount according to 9). Therefore, regardless of the amount of the material to be heated to be fed into the inner pots (93) and (93) and the type of rice to be cooked (regular rice or red rice, etc.), these heating amounts are individually controlled. While cooking rice can be advanced. When the rice cooking is completed, the rice cooking end signal is transmitted to the individual control device (6
When the rice cooker unit (61) that has output the rice cooker finish signal reaches the shuttle transfer position near the shuttle transfer device (40), the unit holder (5) is output by the servo motor (72).
Rotate 0). Then, the guide ring (82) is bent downward at a certain range above the rice cooking unit (61) reaching the vicinity of the shuttle transfer device (40). The proximal end is held down,
Rice cooker unit (61) reaching the vicinity of the kettle delivery device (40)
The rocking arm (16) corresponding to the position (1) rises and turns, and retreats from the upper region of the inner hook (93). Therefore, the inner pot
Lift (93) and transfer it to the unloading conveyor (22). In the above embodiment, the swing arm (16)
Although (16) is vertically rotatably mounted on the support shafts (17) and (17), the swing arms (16) and (16) may be provided so as to be reciprocally rotatable in the horizontal direction. In the above embodiment, the servo motor
Although the unit holder (5) is driven to rotate in (72), a general-purpose motor may be used. In the above embodiment, the support roller (52) is supported by the flange (53) provided on the inner periphery of the upper end of the base (51).
The structure receiving the weight of (50) can be variously changed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an installation state of a commercial rice cooker for explaining a base technology of an embodiment of the present invention. FIG. 2 is a view of an arrangement portion of a commercial rice cooker (5). Sectional view [FIG. 3] Top view of the arrangement part of the commercial rice cooker (5) [FIG. 4] Flow chart illustrating the operation of the commercial rice cooker (5) [FIG. 5] Commercial rice cooker according to a modification of the base technology FIG. 6 is a longitudinal sectional view showing an installation state of a commercial rice cooker according to an embodiment of the present invention. FIG. 7 is an explanatory view of a conventional example. ) ・ ・ ・ Unit holder (61) ・ ・ ・ Cooking unit (72) ・ ・ ・ Servo motor (78) ・ ・ ・ Hot container (79) ・ ・ ・ Heating coil (93) ・ ・ ・ Inner pot

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-113284 (JP, A) JP-A-7-227349 (JP, A) JP-A 10-155 (JP, A) JP-A 55- 163022 (JP, A) Jikai Sho 56-45429 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/14

Claims (1)

(57) [Claim 1] A kettle accommodating portion accommodating an inner kettle detachably and opened upward, and a heating source for heating the inner kettle accommodated in the kettle accommodating portion. A plurality of rice cooker units each having an individual control device for controlling the heating source, wherein the rice cooker in which the rice cooker has been cooked is replaced with an inner rice cooker which is not cooked. In a commercial rice cooker that repeats, the rice cooker after taking out the rice cooker from the rice cooker unit is taken out, and the inner cooker is placed in the rice cooker unit from which the rice cooker has been taken out. A rice-cooking unit transfer device that circulates and moves each of the rice-cooking units along the way; and temporarily stops the rice-cooking unit transfer device each time a specific cooked rice unit that has finished cooking reaches the kettle loading / unloading station. And a control unit, wherein the rice cooking unit transfer device has a vertical rotation axis, and a unit holding body that holds the plurality of rice cooking units in a manner arranged on a circumference of a circle around the rotation axis. A motor for rotating the unit holder about the rotation axis; a plurality of swing arms long in a radial direction of the circle are arranged on the unit holder at an arrangement pitch of the rice cooking unit. In each of the rocking arms, at the rocking tip, which is the outer end of each rocking arm,
A steam temperature sensor is provided for separately detecting the temperature of steam discharged from a steam hole passing through the center of the lid that covers the inner pot, and rice cooking of each inner pot is performed according to the detected temperature of the steam temperature sensor. A commercial rice cooker that individually determines the progress.