JPH04334555A - Rice polishine machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice milling machine for milling brown rice to a predetermined degree of polishing by controlling the internal load of a milling chamber equipped with driven milling rolls, and particularly to a technology for initial milling processing.

0002

2. Description of the Related Art A conventional rice milling machine is constructed as shown in FIG. 16, for example. Inside the polishing tube 501, a feed roll 502 and a polishing roll 503 are arranged, and at the outlet of the polishing tube 501 there is a resistance plate 50 that limits the cross-sectional area of the passage.
4 is provided. In the rice polishing process, a feed roll 502 and a polishing roll 503 are rotationally driven by a motor 505, and the brown rice 506 introduced from the top is pushed toward a resistance plate 504 by the feed roll 502, and is passed through the mesh 5 inside the polishing cylinder 1.
09 and a rotationally driven rice polishing roll 503, the brown rice is polished, and the polished white rice is discharged from a polished rice outlet 507. When the opening degree of the polished rice outlet 507 is made small, the internal load of the milling room becomes high and the whiteness becomes high, and when the opening degree is made large, the internal pressure becomes low and the whiteness becomes low. In order to maintain a constant level of polishing, the resistive plate 504 was biased by the pressing force of a spring 508 in the direction of closing the polished rice outlet 507, and a force exceeding the aforementioned biasing force was applied to the resistive plate 504 from the brown rice being milled. At times, the opening degree of the polished rice outlet 507 is increased to discharge polished rice having a specified level of polishing from the polishing tube 1. Furthermore, in conventional rice milling machines, when milling starts, the first supplied brown rice is discharged without being polished. The one that was purposely set up was the Japanese Unexamined Patent Application Publication No. 6
2-227459. Another way to avoid the brown rice supplied at the start of milling from being discharged without being polished is to reduce the opening of the polished rice outlet in the initial stage of milling, and to prevent the rice from leaving the milling chamber until the internal load of the milling chamber becomes high. It is possible to prevent this from being discharged, but if the opening degree is simply set small during the initial milling, the whiteness obtained during the initial milling will be constant, and the desired whiteness will not be achieved in each whitening process. This is inconvenient for rice milling machines that have specifications that selectively perform whitening processing.

0003

[Problems to be Solved by the Invention] It is an object of the present invention to provide a rice milling machine that mills brown rice at various selectable polishing degrees, and to ensure that the selected polishing degree can be used reliably even during the initial milling process. The purpose of the present invention is to provide a technology that can perform whitening.

0004

[Means for Solving the Problems] In order to solve the above problems, a rice milling machine according to the present invention is comprised of the following: a) a milling chamber equipped with milling rolls that mill brown rice into white rice; b) ) brown rice supply means for supplying brown rice to the whitening room; c) white rice outlet adjustment means provided in the white rice outflow area of the whitening room; d) internal load detection means for detecting the internal load of the whitening room; e) A control means for controlling the milled rice outflow adjusting means according to a value detected by the internal load detection means; f) A milling degree setting means for setting a desired milling degree; g) A milling degree setting means provided in the control means; Initial whitening processing start determining means for determining an internal load value for starting initial whitening processing in accordance with the whitening degree set by.

[0005]

[Function] In the rice milling machine with the above configuration, when milling is performed at a polishing degree selected from among many polishing degrees, the internal load of the milling chamber corresponding to the selected polishing degree is reduced during the initial polishing process. Based on this, the initial whitening process is started.

[0006]

[Effects of the Invention] In other words, brown rice is held in the milling room until it reaches the internal load value of the milling room necessary to obtain the desired degree of polishing, so that it is milled with the selected degree of polishing even in the initial milling process. You can obtain polished rice. Furthermore, the completion of the initial rice milling process started as described above,
If the time is controlled by a timer or by monitoring the internal load of the milling room, initial rice milling processing with more uniform quality can be achieved, and the subsequent transition to the main rice milling processing can be performed with high reliability. It also becomes possible. Furthermore, if the internal load of the whitening chamber is configured to be detected by a torque sensor provided on the rotating shaft of the whitening roll, control based on the detected value of the internal load will function extremely accurately.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In Fig. 1, 1 is a main body casing, and an upper casing 2, a polished cylinder part 3, an intermediate casing 4, and a lower bearing casing 5 are sequentially fitted and connected from the top to the bottom so that their axes are aligned. It is configured. A screw conveyor 6 for supplying brown rice is connected to an opening formed in the upper side wall of the upper casing 2. 7 is a hopper for charging the brown rice, and 8 is a drive motor for the screw conveyor. Reference numeral 9 denotes a rotary shaft that is erected at the center of the upper casing 2, the milling tube portion 3, and the intermediate casing 4, and is formed as a hollow shaft. Upper casing 2 of this rotating shaft 9
A feed roll 10 is attached to the region, and a whitening roll 11 is attached to the whitening tube section 3 area. The feed roll 10 and the whitening roll 11 are connected to each other by a connecting pin 12, and the whitening roll 11 is circumferentially engaged with the rotary shaft 9 by a key 13 at a position near the lower end. In addition, whitening roll 11
A cylindrical recess 14 is formed at the lower end of the opening regulating member 1.
A fitting cylindrical portion 16 extending from the top of 5 is fitted so as to be vertically slidable. The outer peripheral surface of the opening degree regulating member 15 is formed into a cylindrical surface having an appropriate width in the vertical direction. Further, the fitting cylinder part 16 has an inner circumferential surface tapered downward so that the upper end thereof has a pointed shape, and a space is formed between the fitting cylinder part 16 and the outer circumferential surface of the rotating shaft 9. The bran attached to the circumferential surface of the cylindrical recess 14 at the lower end of the cylindrical recess 14 is scraped off, and the bran is not caught between the bottom surface of the cylindrical recess 14 and the upper end of the fitting cylinder 16. . A net 17 is disposed inside the whitening cylinder part 3 at an appropriate distance from the outer periphery of the whitening roll 11, and a discharge port 18 for the bran produced during polishing is opened at the lower part of the side wall of the whitening cylinder part 3. There is. Furthermore, a polished rice outlet forming member 19 is arranged between the lower end of the polished cylinder portion 3 and the upper end of the intermediate casing 4. The inner periphery of the polished rice discharge port forming member 19 is formed into a knife edge, and is in contact with the outer periphery of the opening regulating member 15 having an appropriate width in the vertical direction. A white rice discharge port 20 is formed at the upper end of the side wall of the intermediate casing 4, and a chute 21 is attached thereto. Further, a receiving plate 22 is provided protruding from the rotating shaft 9 to receive the polished rice that has fallen from the polished rice outlet forming member 19 and guide it to the chute 21. intermediate casing 4
An intermediate shaft 23 rotatably supported by a pair of upper and lower bearings 24 is disposed at an intermediate portion thereof, and is fitted and fixed to the lower end of the rotating shaft 9. A torque sensor 25 is arranged in the lower part of the intermediate casing 4, and the upper shaft part 2 protrudes from one end of the torque sensor 25.
5a is fitted to the intermediate shaft 23 so as to be slidable only in the axial direction. Inside the lower bearing casing 5 are a pair of upper and lower bearings 26.
A drive shaft 27 is rotatably supported by a drive shaft 27, and its upper end is fitted to a lower shaft portion 25b protruding from the other end of the torque sensor 25 so as to be slidable only in the axial direction. Furthermore, a drive pulley 28a is fixed to the lower end of the drive shaft 27. This drive pulley 28a is rotationally driven by a motor 28 (not shown in detail) via a drive belt 28b. An opening adjusting shaft 29 is inserted into the hollow rotating shaft 9, and the lower end thereof and the opening regulating member 15 are connected by a connecting member 30 passing through an elongated hole 31 formed in the hollow rotating shaft 9. . The upper end of the opening adjustment shaft 29 is relatively rotatably engaged with the upper surface of an engaging member 34 supported on the elevating member 32 via a spring 33. The elevating member 32 is configured to be movable up and down by an elevating means 35, which is shown simply in FIG. 2 and in detail in FIG. The lifting means 35 is driven by a drive motor 37 as shown in FIG.
It is composed of a feed screw shaft 38 that is rotationally driven by a feed screw shaft 38 , a movable nut body 39 screwed onto the feed screw shaft 38 , and a guide rod 40 thereof, and the movable nut body 39 is connected to the elevating member 32 . That is, the bias force of the spring 33 can be adjusted by the lifting means 35. In the rice milling machine configured as described above, brown rice is transferred from the hopper 7 to the screw conveyor 6 into the upper casing while the rotating shaft 9 is rotationally driven by the drive pulley motor 28 via the drive shaft 27 and the torque sensor 25. If you put brown rice into feed roll 1
It is pushed into the whitening cylinder part 3 at 0, and is polished between the rotating whitening roll 11 and the net 17. In addition, the bran separated during the whitening process is processed by air introduced into the rotating shaft 9 passing through holes (not shown) protruding from the rotating shaft 9 and the whitening roll 11, and passing through the net 17. The rice bran is discharged to the outside along with the airflow flowing toward the rice bran discharge hole 18. The polished rice is moved up and down by the lifting means 35 by the pressure inside the space between the net 17 of the polishing cylinder part 3 and the polishing roll 11, that is, the inside of the polishing chamber.
The white rice is sequentially discharged from an annular discharge opening formed between the outer periphery of the opening regulating member 15 pushed down against the force of the spring 33 bias-adjusted by the white rice outlet forming member 19, and
Thereafter, the polished rice is discharged from the outlet 20 through the chute 21 to the outside. Here, the pressure inside the whitening chamber is detected by the torque sensor 25 as an internal load of the whitening chamber on the rotating shaft 9. FIG. 3 shows a control block diagram of the rice milling machine according to the present invention. Torque sensor 2 mentioned above
5, the motor 8 for the screw conveyor 6, the motor 37 for the lifting device 35, and the motor 2 for the rotating shaft 9, that is, the feed roll 10 and the polishing roll 11.
A control means 36 that outputs a control signal to rice milling machine 8 plays a central role in controlling this rice milling machine. The control means 36 employs a normal microcomputer control method,
It has a CPU 100, a ROM 103, a RAM 104, tables 105 and 106, an input interface 101, an output interface 102, etc., and also has a polishing degree selection means 200 for selecting a desired polishing degree in order to mill rice at various polishing degrees in this rice milling machine. It is equipped. Here, the brightness level selection means 200 includes a numeric keypad type keyboard 210 and a display 2 for selecting the brightness level.
20, and in this embodiment, the degree of brightness can be set from 1 to 16, and the larger the value, the higher the degree of brightness. In the table 105, torque values corresponding to the internal load of the whitening room suitable for the initial whitening process are stored in association with the selectivity selected by the whiteness selection means 200. Furthermore, in this embodiment, three sets of torque values are prepared, and can be selected using the dip switch 105a according to the characteristics of the rice milling machine. In other words, as can be clearly understood from the table in Figure 4,
In the level 1 set, R1 1 to R1 16 are stored corresponding to 16 levels of refinement, in the level 2 set, R21 to R2 16, and in the level 3 set, R3 1
From R3 16 are stored. The relationship between the level of the stored torque value and the degree of polishing is shown in the graph in Figure 5. As the degree of polishing increases, the torque value increases monotonically, and the higher the level of the set, the larger the value. It has become. This makes it possible to use a torque value that can sufficiently compensate for variations in the characteristics of the rice milling machine as the milling chamber internal load value for performing the desired initial milling process. In other words, the CPU 100, the table 105, and the dip switch 105a constitute an initial whitening process starting means. In the table 106, upper and lower limits of torque values corresponding to the internal load of the whitening room suitable for the main whitening process are stored in association with the selectivity selected by the whiteness level selection means 200. It is also possible to prepare a plurality of sets of this series of torque values, and in that case, an appropriate set can be selected using the dip switch 106a according to the characteristics of the rice milling machine. The CPU 100 performs arithmetic processing according to a control algorithm stored in the ROM 103 based on the torque detection signal sent from the torque sensor 25 and the polishing processing mode selected by the polishing degree selection means 200, and performs processing as necessary. With reference to the torque value read from the table 106, the screw conveyor 6
Control signals are output to the motor 8 for the motor 8, the motor 37 for the lifting device 35, and the motor 28 for the rotating shaft 9 to control the whitening process. The control flow of the whitening process of the rice milling machine according to the present invention will be explained below using the flowcharts shown in FIGS. 6 to 14. What is shown in Fig. 6 is a flowchart showing the main routine of this rice milling machine. First, the operator selects the desired degree of milling, that is, the milling processing mode (#0), and presses the start button. When the whitening process starts, the lifting means 35 is driven to adjust the bias of the spring 33 and the opening adjustment shaft 29 is
Set the min urging force (#2). Drive the motor 28 to rotate the polishing roll 11 and the feed roll 10 (#
4) The detected value of the torque sensor in this state, that is, the no-load torque value: To is taken in and stored at a predetermined address in the RAM 104 (#6). This torque sensor 25
In reality, the detection is performed repeatedly at appropriate time intervals in the torque detection interrupt processing described later, and the detected value is stored at a predetermined address in the RAM 104 after appropriate arithmetic processing, so the control routine In this case, the torque detection value can be retrieved from there. Next, set the biasing force of the opening adjustment shaft 29 to Pmax, which is a higher value than Pmin.
(#8). From this point, the actual whitening process begins, which is the initial whitening process (#10), which will be explained in detail later.
It is divided into main whitening treatment (#12) and terminal whitening treatment (#14). The torque detection interrupt processing described above is performed in the seventh
As shown in the figure, first, the torque detection value: T is fetched from the torque sensor 25 and stored in a predetermined address of the RAM 104 (#1100). For example, in this embodiment, eight torque detection values are stored, and the values that are input first are sequentially rewritten with the newly acquired values. This makes it possible to perform calculations using the eight latest torque detection values in subsequent steps. From this torque detection value, the average torque value: Tm is calculated using the moving average method (#12
00), from this average torque value: Tm, subtract the no-load torque value: To taken in #4 and multiply by the coefficient: K to calculate the threshold value: S for completing the main polishing process, which will be described in detail later. (#1300). Coefficient: K is 0<K
Appropriately selected from the range <1. This threshold value: S is stored at a predetermined address in the RAM 104 (#140
0), but in that case, 200 storage locations are prepared, and the latest 200 reference values will be stored. If this interrupt processing is operated in a cycle of, for example, 10 ms, the threshold value S calculated up to exactly 2 seconds ago will be stored. Of course, it is possible to store the threshold value S up to an arbitrary time by taking up a larger storage space or changing the operation cycle. Next, the initial polishing process will be explained using FIG. 8; first, the torque value: Rmn corresponding to the polishing degree selected in step #0 is read from the table 105 (#50).
, this becomes the initial whitening reference value: Tob. Next, the screw conveyor 6 is started operating in the first mode in which the amount of conveyance is large (#51), and brown rice is introduced from the hopper 7 into the internal space of the milling cylinder section 3, that is, the milling chamber. After the time set by the first timer for the milling chamber to be almost filled with the supplied brown rice (#52, #54), the screw conveyor 6
is stopped (#56). Next is the second one with a small conveyance amount.
Operation is restarted in the mode (#64), and step #50
Initial polishing standard value established by: Tob (#
60, #62), when the detected value exceeds Tob, it is assumed that the milling chamber is completely filled with brown rice and the screw conveyor is stopped (#64). In this state, whitening is performed in the whitening room for the time set by the second timer (#66, #68
). It is preferable to control the screw conveyor so that the first mode described above is continuous operation and the second mode is intermittent operation, but instead of this, the first mode is high speed operation and the second mode is low speed operation. It is also possible to do this. Furthermore, instead of setting the operating time of the first mode with a timer, it is also possible to control the operation until a predetermined load value, that is, the detected torque, is obtained while monitoring the internal load of the milling room using a torque sensor. It is. In this initial polishing process, the biasing force against the opening adjustment shaft 29 is adjusted to be high, so that unpolished brown rice is not released. For the white rice polished during this period, the supply of brown rice by the screw conveyor is restarted in the next main milling process, and the opening adjustment shaft 29, that is, the opening regulating member 15 is moved downward due to the pressure of the supplied brown rice pushing into the milling chamber. A discharge port is formed between the opening regulating member 15 and the polished rice discharge port forming member 19, and the polished rice is discharged from this discharge port. Next, the main whitening process will be explained using FIG. 9 to FIG. 13; first, the whitening level selected by the whitening level selection means 200 is checked (#100), and if the whitening level is "1", the whitening level is checked (#110). Based on the steps from #160 to #160, based on the steps #210 to #260 when the fineness level is “2”, and from #310 to # when the fineness level is “3”.
Similarly, when the polishing level is "16", based on steps #410 to #460, 16
Respective whitening treatments are performed depending on the degree of whitening. For example, if the polishing level "1" is selected, the lifting means 35
The bias of the spring 33 is changed by driving the motor 37 of
Set P1 suitable for (#110). The biasing forces P1 to P16 corresponding to this polishing degree are stored in the table 106 and read as necessary. Next, the screw conveyor 6 starts operating in the third mode (#120), and begins to newly supply brown rice to the milling room. This third mode of operation is a so-called steady continuous operation of the screw conveyor 6, and the specifications of the motor 8 of the screw conveyor 6 are usually determined based on the load during this operation. In the polishing process that starts from this, the torque value detected by the torque sensor 25 is compared with the torque range for polishing level "1", that is, the lower limit value: T1a and the upper limit value: T1b (#
130). There is a correlation between the degree of polishing of polished white rice and the internal load of the milling room during milling, that is, the detected torque value in this example. This is because it can be refined with precision. The lower limit value and upper limit value are also stored in the table 106 according to the whiteness level and read out as necessary. Detected torque value: T is the lower limit value:
If it is smaller than T1a, the lifting means 35 is controlled to increment the urging force of the opening adjustment shaft (#140), and if the detected torque value: T is larger than the upper limit value: T1b, the lifting means 35
is controlled to decrement the biasing force of the opening adjustment shaft (#
150), when the detected torque value: T is between the lower limit value: T1a and the upper limit value: T1b, the biasing force of the opening adjustment shaft is left unchanged. In other words, when the internal load of the whitening room increases and the load torque acting on the whitening roll 11 increases, the torque value detected by the torque sensor: T becomes the upper limit: T1b
Become bigger. In this case, the elevating means 35 is driven by a control signal from the control means 36, and the elevating member 32 is lowered. As a result, the upward biasing force of the opening adjustment shaft 29 by the spring 33 is reduced, and the opening adjustment shaft, that is, the opening regulation member 1
5 is lowered, and the flow cross-sectional area of the outlet formed between the polished rice outlet forming member 19 becomes larger. therefore,
The internal load of the whitening room is reduced. Conversely, when the internal load of the whitening room becomes small, the flow cross-sectional area of the outlet becomes smaller through the same procedure, and the internal load of the whitening room increases. In this way, by keeping the torque detection value of the torque sensor constant, accurate polishing degree, that is, polished rice that matches the selected polishing mode can be obtained. During such main whitening processing, the detected torque value: T is equal to the threshold value: S described in the torque detection interrupt processing, which is 2 in this embodiment.
Threshold value calculated seconds ago: If it is less than S, all the brown rice put in hopper 7 is supplied to the milling room, and it is determined that there is no brown rice to be supplied (#160), and the main milling process is performed. and move on to the next terminal whitening process. In other words, the latest torque detection value is checked with a threshold value created by processing the moving average value of the torque values detected a predetermined time ago, and the timing is determined to end the main polishing process, that is, to start the final polishing process. is determined. Up to this point, we have described the main whitening process at a whiteness level of "1," but processes at other whiteness levels are performed in the same way. However, at polishing level "2"
The urging force at #210 is set to P2, and the lower limit value of the detected torque at #230 is replaced with T2a and the upper limit value is replaced with T2b. Similarly, at polishing level "3", the urging force at #310 is P3
The lower limit of the detected torque at #330 is T3a.
The upper limit value is replaced by T3b. Similarly, the fineness level is “1”
6”, the urging force at #410 is set to P16, and #43
The lower limit of detected torque at 0 is T16a and the upper limit is T1
6b. Next, the terminal polishing process will be explained with reference to FIG.
(#500), screw conveyor 6
stop. Since the biasing force against the opening adjustment shaft 29 is suddenly increased, the flow cross section of the discharge port is also reduced, and discharge of polished rice is suppressed. In this state, after the whitening process by the rotation of the whitening roll 11 continues for the time set by the third timer (#520, #530), that is, the time when the brown rice in the whitening room is almost polished, the opening is adjusted. By reducing the urging force on the adjustment shaft 29 and setting it to, for example, Pmin (
#540), the opening adjustment shaft 29 is lowered, and as a result, the flow cross section of the discharge port is expanded, and the polished rice in the milling chamber is discharged. The time for the rice to be completely released from the milling chamber is set in advance on a fourth timer, and when this fourth timer times out (#520, #530), the rotating shaft 9 is rotated as a result of the feed roll 10 and the milling. Roll 11 is stopped (#5
70), a series of whitening treatments is completed. FIG. 15 is a graph showing the relationship between the above-mentioned initial rice milling, main rice milling, and final rice milling and the internal load of the milling room, that is, the detected torque. To explain this graph, X0
At the time point, the rice milling machine is in a no-load operation, and at the time point X1, a biasing force of Pmax is applied to the opening adjustment shaft 29, and the supply of brown rice by the screw conveyor 6 is started. The detected torque value gradually increases, and at time X2, the polishing chamber reaches an internal load state that allows polishing, that is, the detected torque value reaches Toa, and initial polishing is started. When the detected torque value reaches Tob determined corresponding to the selected polishing level at the time of X3, the screw conveyor 6 is stopped for a predetermined time, the supply of brown rice is stopped, and the discharge of white rice is also stopped. Initial whitening continues. As the polishing process progresses, the bran is removed from the brown rice, and the detected torque value gradually decreases. X
At time point 4, main polishing is started, and a biasing force corresponding to the selected polishing mode is applied to the opening adjustment shaft 29, and the screw conveyor 6 is restarted. The torque value increases as brown rice is supplied to the milling room, and the opening adjustment shaft 29 is adjusted so that the torque value falls between the reference torques T1a and T1b corresponding to the selected level of milling while discharging the white rice from the outlet.
Refining treatment is performed while controlling the biasing force against. When there is no brown rice to be milled, no brown rice is supplied to the milling room, so the detected torque value begins to decrease and falls below the threshold value S, which is determined from the moving average of the torque values detected a predetermined time ago. At the time point, that is, at the time of X5,
Increase the biasing force against the opening adjustment shaft 29 to Pmax,
The final stage of milling is performed while suppressing the release of polished rice from the outlet. Then, at the time when the brown rice in the milling chamber has been polished, that is, at the point of
The whitening process is completed at this point. (Another Embodiment) In the above-described embodiment, a torque sensor installed on the rotating shaft of the whitening roll is used to detect the internal load of the whitening room, but instead of this, the current value of the whitening roll motor 28 is used. It is also possible to detect this and thereby monitor the internal load of the milling room. Also,
Instead of comparing the latest torque detection value with the threshold value determined a predetermined time ago to determine the timing of the end of the main milling process, that is, the start of the final milling process, the threshold value determined a predetermined time ago. By comparing the value with the latest moving average value, it is possible to avoid malfunctions caused by suddenly occurring detected values.

[Brief explanation of the drawing]

[Figure 1] Vertical cross-sectional view showing the overall configuration of a rice milling machine

[Fig. 2] Side view showing a means for changing the biasing force of the opening regulating member

[Figure 3] Control block diagram

[Figure 4] Schematic diagram showing a table that stores torque values for initial whitening processing

[Figure 5] Simplified graph showing the change in torque value for initial whitening treatment at each level

[Figure 6] Flowchart showing the flow of control

[Figure 7] Flowchart showing the flow of control

[Figure 8] Flowchart showing the flow of control

[Figure 9] Flowchart showing the flow of control

[Figure 10] Flowchart showing the flow of control

[Figure 11
]Flowchart showing control flow

[Figure 12] Flowchart showing the flow of control

[Figure 13] Flowchart showing the flow of control

[Figure 14] Flowchart showing the flow of control

[Figure 15] Graph showing the relationship between the polishing process and the value detected by the torque sensor

Claims (4)

[Claims] Claim 1: A rice milling machine comprising the following configuration; a) a milling chamber equipped with milling rolls that polish brown rice into white rice; b) brown rice supply means for supplying brown rice to the milling chamber; c) the milling chamber. d) Internal load detection means for detecting the internal load of the whitening room; e) Controlling the polished rice outflow adjustment means according to a value detected by the internal load detection means; f) a whiteness level setting means for setting a desired whiteness degree; g) a whiteness setting means for starting an initial whitening process corresponding to the whiteness level set by the whiteness level setting means, which is provided in the control means; Initial whitening processing start determining means for determining an internal load value. 2. The rice milling machine according to claim 1, further comprising an initial whitening process end determining means, and the initial whitening process end determining means ends the initial whitening process after a predetermined period of time has elapsed from the start of the initial whitening process. 3. The milled rice according to claim 1, further comprising an initial whitening process end determining means, which ends the initial whitening process when the internal load value decreases to a predetermined value. Machine. 4. The rice milling machine according to claim 1, wherein the internal load detection means is constituted by a torque sensor that detects the torque of the rotating shaft of the milling roll.