JP2011062701A - Desktop rice polishing device and rice polishing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desktop rice polishing device which obtains, with short-time operation, polished rice which is good in whiteness and bran removal, few in broken rice and good in qualities. <P>SOLUTION: The desktop rice polishing device polishes brown rice contained in a vessel while agitating by rotation of an agitation member axially supported rotably in the vessel, wherein the desktop rice polishing device has a function for rice polishing treatment, consisting of a cutting treatment of the surface of the brown rice by rotating, with a considerably high speed, the agitation member in which rotation degree and agitation period of the agitation member for agitating the brown rice are defined according to an amount of rice to be polished and the degree of rice to be polished; a finishing treatment for improving the bran removal by rotating the agitation member with a considerably slow speed to give a function polishing the surface of rice to rice; and an intermediate treatment existing between the two treatments, for polishing rice by rotating the agitation member with a speed between the two speeds of the agitation member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tabletop rice mill of the type that stirs and convects brown rice and, in particular, relates to a table rice mill that has good whiteness and good breakage and can reduce broken rice.

  Brown rice before milling is endosperm, umami layer (sub-glue layer), cocoon layer (skin candy, seed coat, epidermis, etc.) from inside, and when rice is polished to white rice, the cocoon part excluding skin candy is removed . After that, if you sharpen with water, the remaining skin folds may fall, but the umami layer may fall. The ideal finished state of milled rice is to reduce the polishing process with water and leave the umami layer. It is to leave a powder layer).

  When rice bran remains due to the lack of polished rice, it is difficult to feel the taste due to the odor and lack of luster. Moreover, if it preserve | saves in this state, oxidation will advance, and if it heat-retains after cooking rice, rice will turn yellow. In the case of excessive rice polishing (excessive rice polishing), it is difficult to feel the sweetness peculiar to umami and rice, and it is also difficult to feel the deliciousness. Therefore, in order to finish the optimal rice milling that leaves the umami layer, milling mills and retailers delicately cultivate commercial rice milling machines with brown rice varieties, temperature, moisture, environmental temperature / humidity, and many years of experience and intuition. Coordinated and polished rice with craftsmanship.

  Various household rice mills that use rotating blades to polish rice by rotating the rotating blades have been proposed. In the case of such a rice mill for household use, the setting (adjustment) is basically made according to the amount of rice to be polished, and the driving time corresponding to the amount of polished rice is programmed in advance, or stored in a storage device in advance. In other words, the drive pattern of the motor senses the number of rotations per unit time and feeds back to the control circuit to control it to a constant rotation speed, so-called closed loop (closed loop) control, and feedback Some are not controlled, so-called open loop control. In the case of the open loop, the rotational speed of the rice milling blades fluctuates (increases) from a heavy initial rice milling load to a lighter final rice milling load.

  As a conventional household rice mill, for example, a table rice mill disclosed in JP-A-2002-282718 will be described with reference to FIGS. FIG. 16 is a cross-sectional view of the main part of the tabletop rice mill, and FIG. 17 is an exploded view of the main part of the tabletop rice mill. In the main body case 11, a rice bran box 6, a polished rice basket 5, and a polished rice blade rotating body 9 are detachably accommodated, and the polished rice blade rotating body 9 includes a shaft 16 a of a drive shaft 16 that stands up through the bottom of the polished rice basket 5. It is mated. The other shaft of the drive shaft 16 is connected to a drive pulley 25, and the rotational drive force of the built-in motor 10 is such that the motor pulley 12, the drive belt 13, the drive pulley 25, the drive shaft 23a, the lower coupling 20, and the upper coupling. 19 is transmitted to the milled rice blade rotating body 9 by the driving mechanism 19, and the milled rice blade rotating body 9 is rotated about the drive shaft 16. The polished rice blade rotating body 9 has a polished rice blade 9 a extending outward from the center of the rotating shaft, and the polished rice blade 9 a is rotated and moved inside the polished rice basket 5 by the axial rotation of the polished rice blade rotating body 9. Like to do. 3 is a lid that covers the rice bran box 6 and the polished rice basket 5 after being fed with the brown rice to be polished, and 7 is a lid that is applied to the main body case 11, and 7 is a start / stop button for polished rice, the amount of polished rice, With an operation panel equipped with an operation unit for setting a desired degree of rice polishing such as embryo rice, the motor 10 is driven by a predetermined drive map stored in a built-in control circuit according to an input of the operation unit. FIG. 17 is a developed perspective view of the rice milling blade rotating body 9, the rice milling basket 5, the rice bran box 6, the drive shaft 16, and the means for transmitting the drive to the driving shaft. The polished rice basket 5 and the rice bran box 6 are configured to be detachable and accommodated in the main body case 11. In FIG. 17, the drive shaft 23a, the upper coupling 19, and the lower coupling 20 are omitted. At the time of milling, with the rice bran box 6, the milled rice basket 5, and the milled rice blade rotating body 9 set in the main body case 11, a desired amount of brown rice is put into the milled rice basket 5 and the lid 3 is covered. Milling is performed by instructing the start of milling from the operation unit.

JP 2002-282718 A

Conventionally, the rotational speed of the milled blades is almost constant from the start of milling to the end of milling (for example, around 2000 revolutions / minute if 5 go), and 5 minutes to 5 minutes if the time required for polishing is 5 go. It took 30 seconds. At first glance, this seems to give a stable quality of polished rice, but in the case of the stirring method, the more stirred, the lower the yield (milled rice ratio = the weight ratio after the completion of the polished rice) and the higher the risk of broken rice. Become. In addition, the rice temperature rises with the lapse of rice milling time, and the more moisture the brown rice has, the more problems the rice cracks. If the rotational speed of the rice milling blades is made substantially constant and the rice milling time is shortened, the quality of the milled rice will be poor because the rice bran cannot be removed. Therefore, it is required to have a polished rice quality that shortens the rice polishing time as much as possible and also has good cutting ability according to the moisture content of the brown rice used. In addition, as shown in FIG. 17, the conventional polished rice basket 5 has a cylindrical shape with substantially the same inner diameter from the upper side to the lower side. Therefore, the rice grains blown by the centrifugal force at the bottom of the polished rice basket 5 by the polished rice blades are steep. Since it is pushed upward along the inner peripheral wall surface of the car, the impact received by the rice grains is too strong, and it is easy to generate broken rice. Furthermore, as shown in FIG. 18 showing a side view of the conventional rice milling blade rotor 9, the rice milling blade 9a is inclined with respect to the bottom surface of the rice mill 5 (inclination angle α, 0 degree <α <90 degrees). Therefore, the rice grains are pushed diagonally upward of the polished rice basket 5 and the milling pressure rubbed against the inner peripheral wall of the cage is insufficient, so that the whiteness is hardly produced. In addition, the rice milling time becomes long, and excessive rice milling or broken rice tends to occur. In addition, when the amount of polished rice is small, the rice grains are likely to be broken up because they are blown above the polished rice basket or collide with the lid.
Since brown rice may be mixed with defective rice such as immature rice or discolored rice, it is necessary to efficiently remove such defective rice during polishing. Furthermore, finishing rice polishing is also important in determining the quality of the rice washing process after rice polishing. Washing rice is an operation of removing only the skin wrinkle layer on the white rice from which the wrinkle other than the skin wrinkle has been removed while maintaining the umami layer (sub paste powder layer). However, if the milled rice is not enough and other rice bran remains on the white rice, or if the milled rice on the surface of the white rice is uneven, it will be impossible to remove only the flesh by washing the rice. Or the skin will remain, causing the taste of rice to deteriorate. On the other hand, if the rice milling is performed excessively, the umami layer may be damaged and the original taste of the rice will be impaired.

  Accordingly, the object of the present invention is to provide a high-quality polished rice for a short time in a domestic agitated convection-type rice mill with good whiteness and broken rice, less crushed rice, uniform white rice surface and easy washing. The purpose is to obtain by the operation of rice milling.

  In order to achieve such an object, the invention according to claim 1 is a table rice mill that polishes rice while stirring the brown rice accommodated in the container by the rotation of the stirring member rotatably supported in the container. The degree of rotation and the stirring time of the stirring member that stirs the brown rice according to the amount and degree of polishing are regulated, and the surface of the brown rice is scraped off by rotating the stirring member at a relatively high speed during the milling period. Rotating the stirring member to give the rice the action of polishing the surface of the rice to improve the rice breakage, and stirring at a speed between the two stirring processes interposed between these two treatments The present invention provides a table rice mill having a function of rice milling, including an intermediate process of rotating a member to mill rice.

  Further, in the table rice mill according to claim 2 of the present invention, in the invention of claim 1 above, a plurality of courses of rice milling of white rice and rice milling between brown rice and white rice are defined.

  Further, in the table rice mill according to claim 3 of the present invention, in the above invention, four stirring members are extended in the radial direction in order to prevent hunting.

  In the table rice mill according to claim 4 of the present invention, in the above-described invention, in the above-described rice milling process, the rotational speed of the stirring member is continuously or stepwise reduced, or the continuous reduction and stepwise reduction are performed. It is combined.

  Furthermore, the invention according to claim 5 is a method of polishing rice while stirring the brown rice accommodated in the container by the rotation of the stirring member rotatably supported in the container, and the stirring member is moved at a relatively high speed. Rotating and scraping off the surface of brown rice, lowering the rotation speed of the stirring member and continuing the milling process, and further lowering the rotation of the stirring member and giving the rice a polishing action improves the rice And a finishing step.

  According to the invention described in the embodiments, rice milling is performed at a relatively high speed at the start of rice milling, and thereafter at a lower speed, and more specifically, a period of time after the start of rice milling Since the speed was made constant and then decreased continuously, or the rotational speed of the milled blades was divided into multiple sections, and the rotational speed was changed stepwise according to the sections and decreased. It is possible to wipe off the straw layer in a short time without damaging the brown rice endosperm or umami layer. That is, in the initial stage of rice polishing, the rice polishing is performed so as to scrape off the surface of the brown rice at a high speed and in a relatively short time. In this initial stage, the rice bran layer absorbs and peels off the impact force at the time of high-speed rotation, so that broken rice is hardly generated. In addition, brown rice may be mixed with bad rice such as immature rice or discolored rice, but such bad rice is fragile compared to good rice, so the defective rice is crushed by the initial high-speed rotation. In the initial stage or the subsequent rice milling stage, it is easy to be passed through the rice milling basket and stored in the rice bran box, and only the good rice can be polished in the rice milling basket. However, if high-speed rotation is continued, broken rice is generated even for good rice. Therefore, in the next second stage, the rotation speed is gradually decreased, or rice milling is performed at a medium speed rotation lower than the high-speed rotation in the first stage. In the second stage, it is preferable that the time is longer than that in the first stage. Lowering the rotation speed changes the way the rice goes around (the direction of rotation of each individual grain), so that the rice surface can be evenly polished. For example, by continuously reducing the number of rotations, in order to bring about various rotations of the rice itself and changes in the convection of the rice in the polished rice basket, the collision of the rice and the mesh portion of the polished rice basket Rice bran can be easily scraped off, and moderately uniform rice polishing is possible. When the rotational speed is decreased stepwise, the third stage of rice polishing is preferably performed after the second stage, in which the rotational speed is further reduced to a low speed. In this third stage, the rice milling process is finished so as to gently polish the rice surface at low speed. In this third stage, the effect of polishing the surface of the rice is generated rather than scraping off the straw by low-speed rotation, and the breaking of the rice is improved. On the other hand, even when the rotational speed is continuously reduced, the third stage is performed while avoiding the risk of excessive rice milling due to the rotation of the rice milling blade, which has become relatively slow during the final milling process. It is possible to finish the finished rice. In this way, the rotational speed of the milled blades from the start of milling to the end of milling is reduced stepwise, for example, in two or three stages, depending on the amount and degree of milling, or the second stage is gradually decreased. Since the rotation direction of the rice is changed and the rice can be polished uniformly and uniformly, the time for the rice polishing can be shortened to save energy and improve the quality of the rice. Furthermore, the temperature of the rice does not rise excessively and the amount of crushed rice does not increase, so that the quality of the polished rice is improved.

  According to the invention described in the examples, the white rice course and the germinated rice course can be further polished with standard polished rice, strong polished rice, and weak polished rice, so that the quality of the rice depends on the state of the brown rice used. White rice or germinated rice can be obtained. In other words, the degree of milling changes depending on the state of the brown rice (variety, quality, storage state, storage period), so it is desirable to set a strong rice polishing course or a weaker rice polishing course by adjusting the number of revolutions and time based on standard rice polishing. Rice polishing is possible. For example, brown rice with low moisture content, such as high hardness brown rice or old rice, is difficult to polish, so we perform rice polishing with a strong rice polishing course and weak rice polishing course with low moisture content such as brown rice or new rice with high water content It is recommended to use rice milling.

  According to the invention described in the examples, by controlling the rotational speed of the rice milling blades, in addition to the three-minute, five-minute, and seven-minute courses, which are generally used as a conventional means of the division course, In addition, rice can be milled in 2 minutes and 8 minutes, then 3 minutes, 5 minutes and 7 minutes, which is an intermediate course of 4 minutes and 6 minutes. In this way, the accuracy of mashing can be improved, so that the mashing course can be subdivided to obtain a variety of mashed rice. In addition, instead of providing even-numbered milling courses, standard rice, weak milled rice, and strong milled rice are used for each of the three-milled, 5-minute and 7-minute milled courses, respectively, as with the white rice and germinated rice courses. A course may be provided. By doing in this way, it is possible to obtain a high-quality sprinkled rice as in claim 6 and rice having a degree of milling that is approximately halfway between 3 minutes, 5 minutes and 7 minutes, that is, 2 minutes. It is also possible to obtain rice having a degree of milling that is almost the same as that for 4 minutes, 6 minutes, and 8 minutes.

  According to the invention described in the examples, the rice grains pushed in the horizontal direction by the rotation of the milled rice blades have an impact on the rice grains that act when spirally rising the inner peripheral wall of the milled rice basket, and the milled rice whose diameter has been expanded upward. Since it is relieved by the shape of the basket, the generation of broken rice can be suppressed. Furthermore, since the inner diameter of the lower part of the polished rice basket is smaller than the upper inner diameter, the milling pressure by the milled blades functions and the whiteness is improved.

  According to the invention described in the examples, the surface for pressing the rice grains of the milled rice blades is disposed so as to be substantially perpendicular to the bottom surface of the milled rice basket. However, the force that presses the rice grain against the peripheral wall of the polished rice basket increases without increasing the grain size of the polished rice basket, so that the milling pressure is improved and the whiteness is improved. Further, as in the invention described in claim 11, the height of the rice milling blade is the minimum allowable rice milling amount (for example, if it is a rice mill from 1 go to 5 mixes, 1 go is the minimum allowable milled rice amount) It is more preferable that it is configured so as to be almost buried when the is introduced.

  According to the invention described in the examples, the rice milling blades can be arbitrarily arranged between 3 and 5 at substantially equal intervals in the circumferential direction, so that the rice grains in the milled rice are particularly between each blade during low-speed rotation. By falling, the vibration (hunting phenomenon) of the vessel caused by the swinging of the rice mill blades can be suppressed.

  According to the invention described in the embodiments, the rotational drive can be indirectly or directly monitored by the sensor, and the rotational speed of the milled blade rotating body can be controlled. Therefore, the milled blade rotating body can be accurately rotated at a desired rotational speed. And the rice milling operation can be performed with higher accuracy.

  According to the invention described in the embodiments, the rice bran box is detachably accommodated in the table rice mill main body, the rice milling basket is detachably accommodated in the rice bran box, and transmits the shaft rotational power from the outside to the inside of the rice milling basket. Since the rice mill rotating body is detachably fitted to the drive shaft, the milled rice basket is made dense even if the rice mill rotating body is removed after the milling is completed. There is no spillage, the rice in the polished rice basket can be left as it is, and it can be washed with water. Furthermore, the rice cake box can be taken out and the rice cake in it can be easily taken out. Easy.

It is a perspective view which shows the external appearance of the whole Example of the table rice mill by this invention. It is a top view of the table rice mill of FIG. It is an enlarged view of the operation panel part of the desktop rice mill of FIG. It is sectional drawing along line IV-IV of FIG. 2 of the desktop rice mill of FIG. It is a figure of the state which decomposed | disassembled the principal part in sectional drawing of the desktop rice mill of FIG. FIG. 3 is a partially enlarged view of a cross-sectional view of the desktop rice mill in FIG. 2. It is a side view for demonstrating the angle of the blade | wing 9a of the rice mill blade rotary body 9 in the desktop rice mill of FIG. It is a figure which shows the structural example of the wire mesh of the rice polishing basket 5 in the desktop rice mill of FIG. It is principal part sectional drawing of the rice polishing machine explaining the rice polishing operation | movement of the desktop rice polishing machine of FIG. It is a principal part perspective view which shows the state which mounted | wore the polished rice basket 5 with the rice milling blade rotary body 9 used for the desktop rice mill of FIG. It is a figure for demonstrating the dimensional relationship of the state of the polished rice basket 5 of the substantially mortar shape by the 1st example used by this invention, and the polished rice blade rotary body 9 installed in the polished rice basket 5. FIG. It is a figure for demonstrating the dimensional relationship of the state of the polished rice basket 50 of the substantially reverse truncated cone shape by the 2nd example used by this invention, and the polished rice blade rotary body 9 installed in the polished rice basket 50. FIG. It is a whole perspective view of the 1st modification of the rice milling blade rotary body used by the present invention. It is a whole perspective view of the 2nd modification of the rice milling blade rotary body used by this invention. It is a whole perspective view of the 3rd modification of the rice milling blade rotary body used by the present invention. It is a whole perspective view of the 4th modification of the rice milling blade rotary body used by the present invention. It is a block diagram which shows the structural example of the control circuit in the control circuit box in the desktop rice mill of FIG. It is a graph for demonstrating the rotational speed control of the 1st pattern of the rice milling blade in the desktop rice mill of this invention. It is a graph for demonstrating the rotational speed control of the 2nd pattern of the rice milling blade in the table rice mill of this invention. It is principal part sectional drawing of the conventional desktop rice mill. It is a principal part disassembled perspective view in the conventional desktop rice mill of FIG. It is a figure for demonstrating the angle of the rice milling blade used for the conventional desktop rice mill of FIG. It is the table | surface which showed the rice milling time of the germ rice mode in the conventional desktop rice mill. It is the table | surface which showed the rice milling time of the white rice mode in the conventional desktop rice mill.

Below, the basic composition of the Example of the table rice mill by this invention is demonstrated with reference to FIGS.
FIG. 1 shows a perspective view of the entire table rice mill 1 of the present embodiment, FIG. 2A shows a plan view of the table rice mill, and FIG. 2B shows an enlarged view of the operation panel 7 of the table rice mill shown in FIG. 2A. Yes. FIG. 3 is a cross-sectional view of a principal part taken along the line IV-IV in FIG. 2A.
1 to 3, a desktop rice mill 1 according to the present invention has a main body case 11, a bottom lid 14 that extends from the main body case to the bottom, and an upper lid 3 provided on the upper portion of the main body case 11. The main body case 11, the bottom lid 14 and the top lid 3 can be made by molding, for example, from ABS resin. As shown in the cross-sectional view of FIG. 3, the upper lid 3 includes an outer frame 4a and an inner frame 4b, a handle 3a attached to the frames 4a and 4b, and glass or acrylic resin sandwiched between the frames 4a and 4b. A transparent window 2 made of The frames 4a and 4b and the handle 3a can be integrally molded. Rubber feet 15 for preventing slipping are attached to the bottom of the bottom lid 14. A power cord 27 having a power plug 28 at its end extends outward from the tabletop rice mill 1.

  Referring to FIG. 2B, the operation panel (operation unit) 7 includes an operation / stop button 70 for instructing start / stop (start / stop) of the rice milling operation, and the amount of brown rice to be polished (for example, 1 to 5 go). A rice milling amount setting button 72 that is a rice milling amount setting means for setting a rice flour, a germination course for performing rice milling that leaves the germ, and a rice milling mill for generating milled rice and milled rice by setting the degree of milling of the rice to be milled It has a milling adjustment (milling degree setting) dial 71 which is a degree (milling degree) setting means. In the vicinity of the rice milling amount setting button 72, a plurality of LED lamps 73 are provided. Each of the plurality of lamps 73 has a corresponding amount of polished rice printed on a unit basis from 1 to 5, and when the milled rice amount setting button 72 is pressed, a plurality of rice polished amounts are set according to the set amount of rice. One of the LED lamps 73 is turned on so that the set amount of rice can be recognized.

  In the present embodiment, the rice milling degree setting means employs a dial type that can be adjusted steplessly, and a plurality of scales are provided around the dial 71 in order to perform rice milling adjustment. For example, in the table rice mill 1 according to the present embodiment, a scale indicating the three stages of a weakly polished (weakly polished rice) course, a standard polished rice course, and a strong polished (strongly polished rice) course in the embryo course, two-minute milling (milling degree 20) %) To 8 minutes milling (milling degree 80%), a scale showing the milled rice course, weak rice (weak rice milling) course to produce white rice (milling degree 100%), standard rice milling course, strong A scale showing the three stages of the polished rice (strong rice) course is engraved. The rice milling degree setting means can set each course by setting the dial 71 to this scale. The rice milling degree setting means is not limited to the dial type, but may be a combination of a button type and an LED lamp as described in the operation of the slide lever type or the rice milling amount setting means. Further, since the milling state of the rice during or after the milling can be recognized from the transparent window portion 2 of the upper lid 3, a re-milling button is provided separately, and if the desired milling degree is not obtained after the milling operation is stopped, The rice milling operation may be enabled only while the rice milling button is pressed.

  In contrast to the cross-sectional view of FIG. 3, FIG. 4 is an exploded view of the main part of the desktop rice mill. 5 is a partially enlarged view of FIG. 4 and 5, 5 is a cylindrical rice mill that accommodates brown rice, in particular a mortar-shaped rice, 9 is a rice mill rotating body that rotates brown rice in the rice mill 5 by rotating, and 6 accommodates the rice mill 5. In addition, a cylindrical rice cake box made of, for example, PP resin that accommodates the rice cake scraped off from the brown rice by the polished rice basket 5, 30 is a cylindrical rice cake box housing case made of, for example, ABS resin that houses the rice cake box 6, The upper end portion 30 a and the bottom opening end 30 b are fixed to the main body case 11, so that the basket box housing case 30 is fixed to the main body case 11.

  Reference numeral 8 denotes a control circuit box that accommodates a control circuit (not shown) of the table rice mill. The control circuit uses the power plug 28 (FIG. 1) of the power cord 27 accommodated in the cord reel assembly 26 as an AC power source. Power is supplied by connecting. 10 is a motor controlled by a control circuit, 10a is a motor drive shaft that rotates as the motor 10 rotates, 12 is a motor pulley that is fixed to the motor drive shaft 10a and rotates with the motor drive shaft, and 13 is a motor pulley 12 and a predetermined The drive belt is wound around a drive pulley 25 formed with a reduction ratio and transmits the rotation of the motor drive shaft 10a to the drive pulley 25. The drive pulley 25 is fixed to the lower end portion of the drive shaft 23a, and the drive shaft 23a also rotates as the motor 10 rotates. The upper end portion of the drive shaft 23a is coupled to the lower end portion of the main body 16b of the drive shaft 16 via a rotary plate (lower coupling) 20 made of, for example, polyacetal and an upper coupling 19 made of, for example, a rubber-based material. The drive shaft 16 is also rotated with the rotation of 23a. A rotation sensor 86 for detecting the motor rotation speed is provided on the side opposite to the output shaft of the motor 10, and the rotation speed of the rice milling blades in the milled rice basket 5 is controlled by controlling the rotation speed of the motor. The rotation sensor 86 may be provided so as to monitor the rotation of the drive shaft 23a or the drive pulley 25. The turntable 20 and the upper coupling 19 are well known.

  A drive shaft 23 a extending in one direction from the shaft center of the drive pulley 25 passes through the opening 24 a of the main body frame 24 and the bottom opening of the basket box housing case 30. A bearing case 22 containing a bearing 21 is disposed between the drive shaft 23a and the opening 24a of the main body frame 24 and between the drive shaft 23a and the bottom opening of the saddle box storage case 30, and the drive shaft The bearing 21 is in contact with the drive shaft 23a so that the shaft 23a can rotate in the respective openings of the main body frame 24 and the bag box housing case 30. A lower end portion of the bearing case 22 is fixed to the main body frame 24 by screws 32. The main body frame 24 is fixed to the main body case 11. The motor 10 is mounted and fixed on the main body frame 24.

  Next, the configuration of the rice mill blade rotating body 9, the rice mill 5, the rice bran box 6, the drive shaft 16, and the like will be described with reference to FIGS. The main body 16b of the drive shaft 16 has a cylindrical shape, is integrally formed of, for example, stainless steel, and is received by a metal cylindrical sleeve metal 17 that is a bearing of the drive shaft 16. The sleeve metal 17 is, for example, It is accommodated in a stainless steel metal case 18. The lower end portion of the main body 16b of the drive shaft 16 is fixed to the upper coupling 19 with screws. The sleeve metal 17 and the metal case 18 are press-fitted and fixed to the inner peripheral portion of the hollow protruding portion 5 g of the polished rice basket 5. An adjustment washer 34 is provided under the sleeve metal 17 to adjust the degree of meshing between the upper coupling 19 and the rotating disk 20. The front end portion 16a of the drive shaft 16 is coated with a resin (for example, polyacetal), has a polygonal column shape, for example, a hexagonal column shape, and is tightly fitted to an angular bearing portion 9c of the milled rice blade rotor 9 described later, thereby Along with the rotation of the drive shaft 16, the milled rice blade rotor 9 is rotated about the axis of the drive shaft 16. In the milled blade rotating body 9, a milled rice blade 9 a extends in the radial direction from the center of axial rotation, and moves in the vicinity of the bottom of the milled rice basket 5 by the rotation of the milled blade rotating body 9.

  A columnar hollow protruding portion 6g is provided on the bottom frame 6f of the basket box 6, and a cylindrical hollow portion 6h is formed at the center of the bottom portion. In the hollow portion 6h, the upper coupling 19 and the turntable 20 are accommodated freely as described above. An upper frame flange 6b projecting outward is provided above the saddle box, and the peripheral edge of the upper frame flange 6b is received and supported by the upper surface of the upper flange 30c of the saddle box storage case 30 as shown in FIG. The Thus, the cocoon box 6 is detachably accommodated in the cocoon box housing case 30. The upper end portion 30a of the straw box storage case 30 is a receiving portion that receives the upper lid 3, and is covered with the upper lid 3 with the straw box 6 and the polished rice basket 5 sandwiched between the inner frames 4b. At this time, the knob 65 provided on the upper end 30a is urged and pushed by the lid, and in conjunction with this, the switch 66 (see FIG. 13) is turned on, and the apparatus power is turned on. When the upper lid 3 is removed during the rice milling operation, the knob 65 is released, the switch 66 is turned off, and the rotation of the rice mill blade rotating body 9 is stopped. In this embodiment, the rice bran box 6 is completely accommodated in the main body 11 and the polished rice basket 5 is completely accommodated in the rice bran box 6. However, other modified forms are possible, for example, Each may be partially accommodated.

  The polished rice basket 5 is formed in a bottomed cylindrical shape having a drive shaft (milled rice blade drive shaft) 16 at the center of the bottom and a mortar shape, and extends to the upper surface side of the bottom frame 5j with reference to FIGS. A hollow projecting portion 5g provided and a cylindrical lower projecting side hollow projecting portion 5i extending to the lower surface side are formed, for example, of stainless steel. From the side peripheral portion 5a (FIG. 3) of the polished rice basket 5 to the bottom surface 5m (FIG. 5), a wire mesh is stretched and joined to the bottom frame 5j. In this embodiment, the wire mesh reaches from the bottom 5m of the polished rice basket to the hollow projection 5i on the lower surface side. However, the wire mesh is not necessarily limited to the one in which the wire mesh is stretched on the bottom 5m of the polished rice basket. A wire mesh may be stretched only on the side periphery of the car. Here, an expanded metal may be used as the wire mesh. Furthermore, it is not always necessary to use a wire mesh as long as it has a mesh-like shape that is hard and strong enough to sharpen the wrinkles. The inner diameter of the lower surface side hollow protrusion portion 5i is substantially the same as or slightly larger than the outer diameter of the hollow protrusion portion 6g of the saddle box 6, and the hollow protrusion portion 6g is loosely fitted into the hollow portion of the lower surface side hollow protrusion portion 5i. At this time, since the inner diameter of the upper surface side hollow protrusion 5g is smaller than the inner diameter of the hollow protrusion 6g, the polished rice basket 5 is placed on the upper end of the hollow protrusion 6g of the paddle box 6. As described above, the sleeve metal 17 and the metal case 18 are press-fitted and fixed to the inner peripheral portion of the upper-surface-side hollow protrusion 5g, and the drive shaft 16 is penetrated. As shown in FIGS. 3 and 4, an upper frame flange 5 e that protrudes outward is provided on the upper portion of the polished rice basket 5, and the peripheral portion of the upper frame flange 5 e is formed on the upper frame flange 6 b of the paddle box 6. Received and supported on the top surface. In this way, the polished rice basket 5 is detachably accommodated in the straw box 6. In the present embodiment, a drive shaft (rice milling blade drive shaft) 16 is formed in the polished rice basket 5, and the drive shaft 23a is transmitted through the hollow portion formed in the bottom of the rice bran box 6 to transmit the rotational driving force. A rotational drive force transmission mechanism that transmits rotational drive force from the outside of the paddle box to the milled rice blade rotor is formed so as to be fitted to the drive shaft 16, but the drive shaft fitted to the drive shaft 23a (Rice milling blade drive shaft) 16 may be formed in the paddle box 6, and the drive shaft (rice milling blade drive shaft) 16 may be a transmission mechanism that penetrates the hollow portion formed in the bottom of the rice mill 5; Other rotational driving force transmission mechanisms may be employed.

  FIG. 9 is an external perspective view in which a portion of the wire mesh of the polished rice basket 5 is cut to show a state in which the polished rice blade rotating body 9 is fitted to the drive shaft 16 of the polished rice basket 5. A polished rice basket 5 according to the present invention includes a lower cylindrical portion 5c formed in a substantially cylindrical shape below, an inclined cylindrical portion 5b that gradually increases in diameter upward from the lower cylindrical portion 5c, and a brown rice that extends upward from the inclined cylindrical portion 5b. It is formed in a mortar shape composed of a substantially cylindrical upper opening (upper cylinder) 5a which is an inlet, and each is connected by a smooth curve. The height (depth) of the lower cylindrical portion 5c is formed so as to be almost filled when the minimum amount of polished rice (1 go) is charged, which is substantially the same as the height of the polished rice blade described later. FIG. 10 is a simplified side view for showing the dimensions of the polished rice basket 5 and the polished rice blade rotor 9 with the polished rice blade rotor 9 installed in the polished rice basket 5. Referring to FIG. 10, the ratio d / D when the inner diameter of the lower cylindrical portion 5c is d and the inner diameter of the upper opening 5a is D is 0.75 to 0.9, and the height H of the polished rice basket 5 is The ratio H / d with the inner diameter d of the lower cylindrical portion 5c is set to 0.7 to 0.8. FIG. 8 is a cross-sectional view of the main part of the rice mill showing a schematic example of the operation of the rice grains 40 stirred by the rice milling blades when performing the rice milling operation of the desktop rice mill of FIG. By configuring the shape of the polished rice basket 5 as described above, the lower cylindrical portion 5c to which the rice grains are pressed increases the milling pressure by the milled rice blades 9a to improve the whiteness and improve the breaking of the rice grains. When circulating as shown by the arrow while rising toward the upper opening (upper cylinder portion) 5a through the inclined cylinder portion 5b, the impact force applied to the rice grains is greatly reduced by shaking in the circumferential direction to prevent broken rice be able to.

  FIG. 11 is a simplified side view of a rice mill 50 according to another embodiment used in the table rice mill of the present invention and the rice mill blade rotating body 9 installed in the rice mill 50. The polished rice basket 50 includes an inclined cylinder portion 50b that gradually increases in diameter upward from the bottom surface of the polished rice basket, and a substantially cylindrical upper opening (upper cylinder) that is a brown rice inlet that extends upward from the inclined cylinder portion 50b. Part) 50a, and the inclined cylinder part 50b and the upper opening part (upper cylinder part) 50a are connected by a smooth curve. As shown in FIG. 11, the ratio d / D between the inner diameter d of the bottom of the inclined cylinder portion 50b and the inner diameter D of the upper opening 50a is set to 0.75 to 0.9, and the height H of the polished rice basket 50 is The ratio H / d with respect to the inner diameter d of the bottom is set to 0.7 to 0.8. By comprising in this way, like the mortar-shaped rice milling basket 5 mentioned above, the lower peripheral wall of the inclined cylinder part 50b to which the rice grains are pressed increases the milling pressure by the milled rice blades to improve the whiteness and to improve the cutting quality. In addition, when the rice grains rise spirally from the inclined cylinder portion 50b toward the upper cylinder portion 50a, the impact force applied to the rice grains can be moderated by shaking largely in the circumferential direction, and broken rice can be prevented.

  In addition, if the height (depth) of the polished rice basket is increased, the distance between the surface of the brown rice put into the polished rice basket and the polished rice blade is increased, and the rotational force (ie, rotational speed) of the polished rice blade must be increased. In other words, the stirring force applied to the rice grains increases and the amount of broken rice increases. Further, when the diameter of the polished rice basket is increased, the horizontal length of the polished rice blades must be increased, and the blade peripheral speed at the radial ends of the polished rice blades is increased, so that broken rice tends to increase. Therefore, when the size of the polished rice basket is kept within a certain ratio as described above, it is possible to produce polished rice with good quality in combination with the shape of the polished rice basket. In addition, each upper cylinder part 5a and 50a in the polished rice basket 5 and the polished rice basket 50 does not necessarily need to be cylindrical, and if the above-described ratio is observed, an extended inclined cylinder part extending smoothly from the inclined cylinder part may be used. good. Further, in a general rice milling machine with a rice milling capacity of 5-6 go, the inner diameter of the bottom of the polished rice basket is about 110-130 mm, and the inner diameter of the top (brown rice input) is about 140-160 mm. Is good.

  The mesh shape of the wire mesh in the polished rice baskets 5 and 50 is shown in FIG. The mesh shape is a rhombus that is long in the vertical direction or a long rhombus in the horizontal direction from the bottom to the top of the polished rice basket. As will be described later, brown rice is put into the rice basket at the time of milling and the drive shaft is rotated so that the brown rice is stirred by the rotation of the milled rice blade 9a, and the brown rice is meshed with the mesh of the milled rice baskets 5 and 50 by the centrifugal force. The scissors are scraped off by moving obliquely upward along the wire mesh as indicated by the arrows in FIG. 7 while being rubbed. The size of the rhombus is such that the length SW in the short direction is preferably about 2.2-3.0 mm so that the rice does not jump out of the mesh of the wire mesh and does not enter the mesh. Is between about 2.8-4.6 mm, for example, (SW: LW) = (2.2 mm: 3.0 mm) or (2.5 mm: 3.5 mm) or (3.0 mm: 4.6 mm). The mesh shape of the wire mesh may be a quadrangle (rectangle or square), in which case the length of one side in the vertical and horizontal directions is in the range of about 2.0 to 3.0 mm. In addition, the mesh shape may be circular, in which case the diameter is in the range of about 1.3-3.0 mm. In either case, the thickness and width of the metal mesh are both about 0.4 to 0.6 mm, for example. With the above mesh shape and size, good rice to be polished is prevented from coming out from the wire mesh on the side of the polished rice basket into the outer rice bran box, and the relatively high-speed rotation of the polished rice blades at the initial stage of the rice polishing described later. Since the defective rice crushed by the slag comes out of the wire mesh and is stored together with the cocoon in the outer cocoon box, it is possible to make only the relatively good rice.

  FIG. 6 is a side view of the polished rice blade rotating body 9 as seen from the direction in which the polished rice blade 9a extends. The milled rice blades 9 a extend from the central shaft portion of the milled rice blade rotating body 9 to the periphery. Referring to FIG. 5, the milled rice blade rotor 9 is a base portion of the milled rice blade 9a and serves as a rotating shaft, for example, a cylindrical boss made of PP resin (that is, detachably fitted to the drive shaft 16 to A member that rotates together with the drive shaft) 9b, and an angular bearing portion 9c that extends from the boss 9b with a reduced diameter. The boss 9b and the angular bearing portion 9c can be made by integrally molding, for example, a resin such as PP resin, or may be made by molding a metal such as stainless steel. A plurality of (for example, two) milled rice blades 9a extend in the radial direction from the boss 9b of the milled rice blade rotor 9, and each has a plate shape. The plurality of rice milling blades 9a are arranged at substantially equal angular intervals in the circumferential direction when viewed from the center of the rotation axis (if two are arranged, they are arranged to face each other at 180 degrees). The milled rice blades 9a are preferably molded integrally with the boss 9b, but may be separately formed so as to be fixed to the boss 9b. As shown in FIG. 6, the rice milling blades 9 a are arranged substantially perpendicularly (angle α = about 90 degrees) with respect to the bottom surface of the boss 9 b or the bottom surface of the polished rice basket. Referring to FIGS. 3 to 5, the hollow portion 9 d of the boss 9 b receives and accommodates the upper surface side hollow protrusion 5 g of the polished rice basket 5. The hollow portion 9e of the angular bearing portion 9c has a hexagonal column shape, and can be fitted to the distal end portion 16a of the drive shaft 16 to such an extent that the angular bearing portion 9c does not easily disengage even if the angular bearing portion 9c rotates together with the drive shaft 16. Yes. As a result, the milled blade rotating body 9 is detachably fitted to the distal end portion 16 a of the drive shaft 16 and is rotated as the motor 10 rotates. Note that the shapes of the distal end portion 16a of the drive shaft 16 and the hollow portion 9e of the angular bearing portion 9c are not limited to a hexagonal column shape, and may be a triangular column shape, a quadrangular column shape, a pentagonal column shape, or the like. The square bearing portion 9c is extended to almost the same height as the upper end of the polished rice basket 5 so that the user can easily access the angular bearing portion 9c, and is easily detached from the polished rice basket 5. When the rice grains circulate as indicated by the arrows in FIG. 8 while rising in a spiral shape on the peripheral wall of the polished rice basket 5, they are easily circulated around the shafts (bosses 9b, angular bearing portions 9c) of the polished rice blades 9a.

  As shown in FIG. 9, the rice milling blades 9a are disposed substantially perpendicular to the bottom surface 5m of the polished rice basket 5, so that the rice grain pressing surface is substantially perpendicular to the bottom surface 5m of the polished rice basket 5a. (Extruded surface) 9f is formed. Further, as shown in FIGS. 10 and 11, the height h1 of the rice milling blade 9a is substantially the same as the height h2 of the lower cylindrical portion 5a of the rice mill 5 and the minimum allowable rice milling amount (one go) of brown rice is input. When done, the rice grain pressing surface 9f is buried in the brown rice. Therefore, even in the case of a minimum allowable milled rice amount of about 1 go, the force of pressing the rice grains against the peripheral wall of the polished rice basket increases without increasing the grain size of the polished rice grains due to the rotation of the polished rice blades, and the milling pressure increases. Whiteness is improved.

12A and 12B show other modified examples 90 and 91 of the rice mill blade rotating body. In FIG. 12A, the polished rice blade 90a is a band plate piece fixed to the boss 90b in a direction orthogonal to the bottom surface of the polished rice basket, and the end portion of the band plate piece is raised from the end 90a ₁ upwardly like a bowl. It has the rice milling blade 90a which becomes. Even in the case of the rice mill blade rotating body 90 configured as described above, the rice grain pressing surfaces 90f and 90f _{1 that} are substantially perpendicular to the bottom surface of the milled rice basket are formed, and thus have the same action as the rice mill blade rotating body 9. . FIG. 12B shows a strip piece in which a rice milling blade 91a is fixed to a boss 91b in a direction orthogonal to the bottom surface of the polished rice basket, and the strip piece is bent in a substantially arc shape parallel to the bottom surface of the polished rice basket. It is what is letting. Even in the case of the rice mill rotating body 91 configured as described above, when rotating in the direction of the arrow in FIG. 12B, a rice grain pressing surface 91f substantially perpendicular to the bottom surface of the milled rice basket is formed. Has the same effect.

  In addition, as shown in FIG. 8, when there are two milled rice blades 9a, the rice in the milled rice ascends the peripheral wall of the milled rice basket 5 at a low speed rotation and extends along the extension of the milled rice shaft portion of the milled rice blade rotating body 9. When it flows down, it falls between the rice milling blades 9a arranged opposite to each other, that is, into a space of about 180 degrees formed by the two rice milling blades 9a. When the rice falls, a large resistance is applied when trying to push out the rice grains with the pressing surface of the polished rice blade 9a, and the polished rice blade swings. When the milled rice blades oscillate, a hunting phenomenon occurs and the body of the milling machine vibrates. When the vessel vibrates, it is not only acoustically unpleasant, but also the rice grains are impacted locally due to the swinging of the milled rice blades, increasing the amount of crushed rice and making uniform milling impossible. Vibrations are particularly likely to occur during low-speed rotation with a relatively large amount of polished rice of 3 or more. Therefore, it is preferable that stirring can be performed before the rice grains fall between the rice milling blades 9a or when the rice grains are small, that is, while the resistance of the rice grains is relatively small.

  FIG. 12C shows an example of a rice mill blade rotating body 92 having more than two, for example, four rice milling blades for the purpose of preventing such a hunting phenomenon. That is, it has four rice milling blades 92a radially extending at substantially equal angular intervals in the radial direction around the drive shaft 16 and / or the boss 92b. With such a rice milling blade, the space between the rice milling blades is narrowed, so the hunting phenomenon occurs because the rice can be agitated at low speed before the rice grains in the rice mill fall on the bottom surface 5 m (see FIG. 9) of the rice milling basket 5. It becomes difficult to do. In addition, the number of blades is not limited to four, and an effect can be obtained with about 3 to 5 blades. When the number of blades is increased more than necessary, when the rice grains circulate, they hit the upper portion of the blades and scatter upward, resulting in less pressing force on the side periphery of the polished rice basket and increased broken rice. Therefore, when the arrangement angle in the circumferential direction of the blades is A (that is, A = approximately 360 / n degrees when the number of polished rice blades is n), A or n depends on the amount of polished rice and the rotational speed of the polished rice blades. The rice grains are selected so that the rice grains are moderately stirred. In addition, in the case of a vessel set with a small rice milling capacity (for example, a vessel in which the capacity for polishing rice is limited to about 1 to 2), it is possible to use two rice milling blades. Accordingly, the number of polished rice blades can be arbitrarily selected between 2 and 5.

FIG. 12D shows a polished rice blade rotating body 93 of the fourth example. The difference from FIG. 12C is that the width gradually decreases from the base of the milled rice blade 93a to the end in the radial direction on one piece (the bottom side of the polished rice basket) of the milled rice blade 93a radially extending at substantially equal angular intervals in the radial direction. At the same time, a reinforcing piece 93a ₁ protruding rearward in the rotational direction indicated by the arrow is provided. The reinforcing piece 93a ₁ serves to reinforce the milled rice blade 93a, and the swinging of the milled rice blade is more effectively suppressed by the reinforcing piece. The width of the reinforcing piece may be appropriately set according to the thickness of the rice mill blade, the length in the horizontal direction, and the rice milling capacity of the vessel.

  Next, the control circuit and the rice milling operation of the desktop rice mill according to the present invention will be described. FIG. 13 is a block diagram showing a configuration example of the control circuit (control unit) 80 in the control circuit box 8. The control circuit 80 includes a microcomputer 81 and a motor drive circuit 88 that drives and controls the motor 10. The microcomputer 81 is connected to the operation panel 7, and also connects the speed sensor 86, the input / output (I / O) circuit 82 connected to the motor drive circuit 88, the CPU 83 and the memory (ROM, RAM) 84. A bus 85 is provided. In the memory 84, the rotational speed of the rice milling blades for each degree of milling according to the amount of milled rice (rotational speed of the rice milling blades set by the motor drive given by the PWM ratio, accuracy of about ± 20 rotations / minute) and the milling time ( The rotation time of the rice milling blades, accuracy of about ± 2 seconds) is preset or programmed.

  The operation of the rice polishing will be described. First, the rice bran box 6 is accommodated in the rice bran box housing case 30, the rice milling basket 5 is further accommodated in the rice bran box 6, and the rice mill blade rotating body 9 is fitted to the drive shaft 16. A desired amount of brown rice 40 is put into the polished rice basket 5 and the upper lid 3 is closed. Next, when the power plug 28 is inserted into the outlet, the switch 66 interlocked with the knob 65 is turned on as described above, and the apparatus power is turned on. Note that the power plug 28 may be inserted into the outlet before closing the upper lid 3. Next, the milled rice amount is set according to the amount of brown rice introduced by the milled rice amount setting button 72, and an optional milling degree (white rice / seed / germ rice) is set by the milling degree adjustment dial 71. When the stop button 70 is pressed, the motor 10 rotates at a rotation speed corresponding to the set degree of milling and the amount of milled rice, and the milled rice blade rotating body 9 rotates. Then, the brown rice 40 is agitated by the rotational movement of the milled rice blades 9a, and the brown rice is rubbed against the friction between the rice grains and the mesh of the wire mesh on the side periphery of the polished rice basket 5 to scrape off the straw. Further, the scraped ridge 41 is blown outward from the mesh by centrifugal force and dropped into the ridge box 6. As shown in FIG. 8, the rice grains pressed by the rotation of the milled rice blades 9 are hung on the side peripheral portions 5 c, 5 b and 5 a of the milled rice basket 5 and rise upward in a spiral shape, and move toward the upper side of the milled rice basket 5. Then, rice milling is performed by repeatedly repeating the trajectory of flowing down along the shaft portion formed by the cylindrical boss 9b and the angular bearing portion 9c extending to the vicinity of the upper end portion of the polished rice basket 5. In order to cause such convection of brown rice, the brown rice circulates in the polished rice basket as shown by the arrow in FIG. 8 so that the brown rice in the polished rice basket is uniformly polished as a whole. When the motor 10 rotates for a time corresponding to the set milling degree and the amount of milled rice, the rotation automatically ends and the milling of the desired milling degree is completed. Thus, rice bran is reliably and easily separated from the brown rice, and rice having a desired degree of milling can be obtained.

  Since the polished rice state can be seen through the transparent window 2 of the upper lid 3, the operation / stop button 70 can be pressed at an appropriate time during the polishing to stop the polished rice. After the milling, the upper lid 3 is removed, and the milled blade rotating body 9 is further removed from the drive shaft 16 and taken out. The milled rice basket 5 is taken out and the rice after the milling in the milled rice basket 5 is taken out. At this time, the rice in the polished rice basket 5 can be left as it is and washed with water. Further, the basket box 6 is taken out and the basket inside it is taken out.

  An example of performing rice milling by gradually decreasing the rotation of a rice mill blade rotating body (rice milling blade) using the above-described desktop rice mill of the present invention will be described with reference to FIG. 14 and Tables 1 to 5. In this embodiment, since the maximum allowable rice milling capacity is set to 5 go, the rice milling blade rotating bodies to be used are the rice milling blade rotating bodies 92 and 93 (see FIGS. 12C and 12D) having four rice milling blades. .

FIG. 14 is a graph of the stirring rotation speed V of the rice mill blade rotating bodies 92 and 93 (rice milling blades 92a and 93a) with respect to the rice milling (stirring) time T in the rice milling operation. The stirring rotation speed V of the rice milling blades is divided into a plurality of constant speed rotation operation sections from the start to the end of the rice milling operation. In the example of FIG. 14, the rice milling blades 92a and 93a rotate at a relatively high constant rotational speed in the first stage a of a predetermined period from the start of the rice milling operation, and in the second intermediate stage b, In the final third stage c, it is divided into three operation sections a, b and c that rotate for a predetermined period at a relatively low rotational speed. However, depending on the amount and degree of milling, it may not be necessary to carry out three stages of milling, so it is possible to perform three stages of milling, one stage of milling, and two stages of milling. Stored or programmed in the memory 84 of the rice mill.
Tables 1 to 5 below show rotation speeds and rotation operation periods that are preset according to the degree of rice polishing and the type of rice for each amount of polished rice.

(Stepwise stirring operation)

  First, an example in which rice milling is performed only by constant speed rotation (first rotation) will be described. As can be seen from Table 1 to Table 5, the polished rice by this first rotation is a relatively high rotation, and the rice is polished so as to scrape the straw at a stroke with a short time of polishing. It is suitable for milled rice that leaves a large number of straw layers up to about 30%. In this case, the rotational speed of the rice milling blade is set to an arbitrary constant speed between about 2200 to 2300 revolutions / minute depending on the amount of milled rice, and the milling time slightly increases depending on the amount of milled rice, but is generally the maximum number (5 However, it will be polished in less than 1 minute 40 seconds. In this way, in the case of polished rice having a relatively large amount of brown rice bran layer, it can be polished at a constant speed so as to scrape off the straw at a high speed. Even at high speed rotation, the rice bran layer absorbs the impact force and peels off, and the time for rotating the milled rice blades is short.

  Next, an example in which rice milling is performed at two-stage speeds of the first rotation to the second rotation will be described. In this case, the rice milling is preferably applied to a 7-minute sowing course of 1 go 7 minutes (milling degree 70%), 8 min soup (milling degree 80%), and 2 go to 5 go. Incidentally, in a weak rice milling course in a single germinated rice, the second rotation and the third rotation are performed at the same speed, and the rice is polished at substantially two stages. In the first rotation, the rice cake is scraped off at a high speed, and in the second rotation, the rice is polished at a reduced speed. Thus, by reducing the rotation speed of the milled rice blades, the rotation direction of the rice (the rotation direction of each individual rice grain) is changed, so that the surface of the brown rice bran layer is evenly shaved off. As for the rice polishing time, if the second rotation is a little longer than the first rotation, or if the rice is polished in approximately the same time, the action of polishing the rice occurs, and the cutting of rice is improved and the generation of broken rice can be suppressed. By polishing the rice in this way, the time until the completion of the polishing is 1 minute 35 seconds in a single white rice course.

  Next, an example of polished rice using three-stage speeds from the first rotation to the third rotation will be described. In this case, the milled rice is suitable to be applied to a single milled rice course, a germinated rice course, a milled rice course of 2 min or more, and a milled rice course of 80 min. It is. The relationship between the rotational speed and time in the divided rice and white rice course is that the rotational speed is first rotational speed> second rotational speed> third rotational speed, and the milling time (rice milling blade driving time) is the second rotation> second rotation. One rotation ≧ third rotation. However, in a single white rice course, since the amount of polished rice is small and the density of the rice grains is small, the rice is likely to be crushed due to the jumping of the rice during the polishing and the collision with the lid, so the time for the first rotation is minimized. The relationship between the rotational speed and time in the embryo rice course is that the rotational speed is 1st rotational speed> 2nd rotational speed> 3rd rotational speed according to the amount of milled rice, and the milling time (rice milling blade drive time) is the 1st rotation. > Second rotation> Third rotation. Similarly, when the amount of polished rice is as small as about 1 to 2, the broken rice is easily generated and the germ is removed, so that the time for polishing at the first rotational speed is minimized.

  In the first rotation in the initial stage of rice polishing, the rice is polished so as to scrape the surface of the brown rice at a high speed and in a relatively short time. However, since the crushed rice increases at the high speed rotation as it is, the rotation speed is lowered from the first rotation at the next second rotation, and the rice milling is performed at the medium speed rotation. In the second rotation, the rice milling is performed for a longer time than the first rotation. However, in the case of 3 or more germinated rice courses, the second spinning time is shorter. Lowering the rotation speed changes the way the rice is rotated (the direction of rotation of each individual grain), so that the rice surface is uniformly polished. Next, after the second rotation, the rotation speed is further reduced to a low-speed rotation, and the rice milling is performed in the third rotation. This third rotation basically takes less time for rice milling than the first and second rotations, and the way the rice is rotated (rotation of the rice) is further changed by deceleration, and the rice is not scraped off by low-speed rotation. This is a finishing rice milling process that has the effect of polishing the surface and improving the cutting ability. By using rice milling in this way, in 5 go white rice, about 2 min 45 sec, about half of the time required for conventional constant speed milling (about 5 min 30 sec), and 5 go germ Rice can be polished in about 3 minutes and 10 seconds, which is about one third of the time (about 12 minutes) required for conventional constant speed rice polishing.

  Furthermore, the broken rice rate (%) in white rice (1 go to 5 go) (crushed rice weight (g) / milled rice weight (g) × 100) was about 1%, which was about half of the conventional example. . The same effect can be obtained even if the rotation speed is set in two stages according to the amount of milling and the amount of polished rice. Furthermore, adding standard milled rice, strong milled rice, and weak milled rice according to the variety, hardness, and moisture content of brown rice will give a higher quality milled rice combined with the control of the rotation speed.

  An example of performing rice milling by linearly decreasing the rotation of the rice milling blade rotating bodies 92 and 93 (rice milling blades 92a and 93a) using the above-described tabletop rice mill of the present invention will be described with reference to FIG. 15 and Tables 6 to 10. To do.

FIG. 15 is a graph of the stirring rotational speed V of the rice mill blade rotors 92 and 93 (rice milling blades 92a and 93a) with respect to the rice milling (stirring) time T in the rice milling operation. The stirring rotation speed V of the rice milling blades is relatively high and constant for a certain period at the beginning of rice milling, and is linearly decreased at a certain rate after the certain period has elapsed until the end of the rice milling. It is divided into. That, rice wings 92a, 93a, in a first stage of the starting polished rice operation (t = 0) from a predetermined time period (t = _{t 1),} a constant rotational speed _{v 0,} the next time (t _{= t} 1 ~ In the second stage of t = t ₂ ), the rotational speed v ₁ (= v ₀ ) decreases continuously to v ₂ (v ₂ <v ₁ ). However, depending on the amount and degree of milling, it may not be necessary to carry out two stages of milling. In addition to two stages of milling, it is stored in the memory 84 of the table mill so that only one stage of milling is possible. Or it is programmed.
Tables 6 to 10 below show rotation speeds and rotation operation periods that are preset according to the degree of rice polishing and the type of rice for each rice milling amount.

(Linear decreasing stirring operation)

  First, an example of performing rice milling only by constant speed rotation will be described. As can be seen from Table 6 to Table 10, the polished rice by only the constant speed rotation is basically the same as the polished rice only by the constant speed rotation shown in Table 1 to Table 5, and its original purpose is not changed. The rice is milled to scrape off. However, in Tables 1 to 5 and Tables 6 to 10, the rotational speed is partially different. It was made suitable for the remaining rice. In this case, the rotational speed of the rice milling blade is set to an arbitrary constant speed between about 2150 to 2300 revolutions / minute depending on the amount of milled rice, and the milling time slightly increases depending on the amount of milled rice, but generally the maximum number (5 However, it will be polished for 1 minute 20 seconds. In this way, in the case of polished rice that leaves a relatively large amount of brown rice bran, it can be polished at a constant speed so as to scrape the straw at a high speed. Even at high speed rotation, the rice bran layer absorbs the impact force and peels off, and the time for rotating the milled rice blades is short.

  Next, an example will be described in which rice rotation is performed at a constant speed for a certain period immediately after the start of rice polishing, and the rotation speed is continuously decreased continuously. In this case, the milled rice is milled for 6 minutes for 1 to 5 mills (milling degree 60%), 7-minute milling (milling degree 70%), 8-minute milling (milling degree 80%) course, white rice course, germ It is suitable when applied to the rice course. In the first rotation, the rice cake is scraped away at a high speed, and in the next rotation by continuous diminishing, the rice is polished while the rotation speed is decreased with time. By gradually reducing the rotational speed of the milled rice blades, the rotational direction of the rice (the direction of rotation of each individual rice grain) and the convection of the rice in the polished rice basket change, so that the surface of the brown rice straw layer is scraped more uniformly. In the rice milling time, the first rotation of the first stage is completed in a relatively short time, while the time during which the rotation speed decreases linearly in the second stage is lengthened. In particular, the rice milling operation in the second half of the second stage toward the low rotation speed at the end of rice milling produces an action that polishes the surface of the rice rather than scraping off the rice bran. It was possible to drop extra traps while maintaining. The time required for the entire milled rice is, for example, 1 minute 35 seconds for the 1st white rice course (standard), 3 minutes 30 seconds for the 5th white rice course (standard), and continuously decreases. The period is 80 seconds (1 minute 20 seconds) and 195 seconds (3 minutes 15 seconds), respectively, and occupies most of the whole. At the beginning of this continually decreasing rotational change, the uneven surface of the rice that was shaved off at a stretch was smoothed out and the remaining wrinkles were scraped off while moving to a polishing process while moving to a polishing process. It is possible to obtain uniform white rice as originally required. In addition, by reducing the initial rotational speed of the germinated rice, and by taking a longer period of reduction than that of white rice, it was possible to remove other unnecessary rice cake while leaving the germ. Furthermore, depending on the quality, hardness, and humidity of the brown rice, it is possible to make fine control by providing strong, standard, and weak in the white rice course and the germinated rice course, enabling high-quality polished rice. It is possible to cope with slightly different textures. The table rice mill memory 84 stores or programs in advance how to polish the rice according to the degree of rice polishing and the amount of rice polished, so that high-quality rice polishing can be easily performed by button operation.

  Conventionally, it is not a rice milling operation in which the rotational speed is attenuated as shown in Table 1 to Table 10, but simply a rice milling operation by constant speed rotation. FIG. 19 and FIG. 20 show the standard rice milling time required for each rice milling amount from 1 go to 5 go performed only in the conventional constant speed operation. FIG. 19 shows the conventional rice milling time when the germinated rice is polished, and FIG. 20 shows the conventional rice milling time when the polished rice is polished. Compared with the conventional result of FIG. 20, the rice milling time by the rice mill of the present invention is shown in Table 1 in which the rotational speed was decreased stepwise while it took 2 minutes and 20 seconds in the past. It is 1 minute and 35 seconds for 1 rice milling course (standard) and 1 rice milling course (standard) shown in Table 6 in which the rotational speed was continuously reduced. The ability to polish rice in such a short time also means that crushed rice is suppressed and that the influence (rice cracking) due to the moisture content of brown rice itself is reduced. In the case of the germ rice course, it is the polished rice with the germ left, so the rotational speed is lower than that of the split rice and white rice course, and the overall stirring time is longer than that of the split rice and white rice course. Rice milling becomes possible in a shorter period of time than conventional rice milling time, and the quality of the germinated rice is improved.

  In this way, the rotational speed of the milled blades from the start of milling to the end of milling is divided into multiple stages, for example, three stages or two stages, and gradually decreased or continuously decreased. The direction of rotation of the rice grains inside changes, the behavior of the rice in the rice basket changes, and the rice surface can be uniformly polished, so the time for rice polishing can be shortened. Since the time for milling can be shortened, energy saving can be achieved and broken rice can be suppressed, and the temperature of the rice does not rise, so that cracking of the rice due to the difference in moisture content of brown rice itself can be suppressed.

  At the time of milling, the load on the milled blade rotating body varies with the progress of milling. Therefore, a so-called feedback-type table-top rice mill that directly or indirectly monitors the rotation speed and controls the rotation speed according to the result can achieve a predetermined desired rotation speed, but does not perform feedback control. In some cases, the rotational speed increases as the wrinkles are scraped off and the load is reduced. In the present invention, unless particularly limited, if the rice mill is configured to reduce the rotational speed as time elapses, even if it is a rice mill that produces fluctuations in the rotational speed during that time, It should be interpreted as belonging to the technical scope. Further, depending on the degree of rice polishing, it is considered that it is sufficient if the rice is polished by a single constant speed rotation as shown in the previous embodiment, but the present invention is a milled rice by such constant speed rotation, Of course, the technical scope of the present invention also extends to a rice mill having the function of both rice mills whose rotational speed gradually or continuously decreases. If you want to produce milled rice that leaves a lot of straw layers, you only need to set a single speed section that rotates at a predetermined speed in the memory of the control circuit. Can be obtained.

Furthermore, this invention is not limited to the said embodiment, The rotation speed and rotation time of a rice milling blade can be suitably changed in the range which does not deviate from the main point of this invention. For example, referring to Table 1 to Table 5, the milling time for the second rotation may be set slightly longer and the time for the third rotation may be set shorter, or the second rotation Set the rotation speed slightly higher to shorten the second rotation time, extend the third rotation time, and finely adjust the rice polishing time in each speed category without changing the total rice polishing time. It is also possible to do. Furthermore, the rotational speed in at least one of the stages may be slightly reduced to extend the rice milling time accordingly, so that the total time until the completion of the rice polishing may be slightly increased, and the obtained effect is not affected. Further, in addition to linearly decreasing the rotation of the milled rice blades, if necessary, it may be gradually decreased in a curved line, or a combination of stepwise decreasing and continuous decreasing.
In addition, the splitting course may be set for 3 minutes, 5 minutes, and 7 minutes, and the standard milled rice, the weakly polished rice, and the strong polished rice may be additionally set in each of the divided milling courses. By doing this, it is possible to obtain high-quality milled rice according to the state of brown rice, and rice with a rice milling degree approximately in the middle of each milling course can be obtained. It is possible to obtain rice that is roughly the same as 6 minutes and 8 minutes.

1 Table milling machine 3 Upper lid (lid)
5, 50 Rice milling baskets 5a, 50a Upper cylindrical part 5b, 50b Inclined cylinder part 5c Lower cylindrical part 6 Kashiwa box 7 Operation panel 8 Control circuit box 9, 90, 91, 92, 93 Rice milling rotor 9a, 90a, 91a, 92a, 93a Rice milling blades 9f, 90f, 91f Rice grain pressing surface 10 Motor 11 Body case 16 Drive shaft 23a Drive shaft 70 Run / stop button 71 Rice milling adjustment dial 72 Rice milling amount setting button 73 LED lamp 80 Control circuit

Claims (5)

There is a table rice mill that polishes rice while stirring the brown rice contained in the container by rotation of a stirring member rotatably supported in the container,
The degree of rotation and the stirring time of the stirring member that stirs brown rice according to the amount of polished rice and the degree of polishing are defined,
A process of rotating the stirring member at a relatively high speed to scrape off the surface of the brown rice, a finishing process to improve the breaking of the rice by giving the rice an action of rotating the stirring member at a relatively low speed to polish the surface of the rice, and A table rice mill having a function of a rice milling process, including an intermediate process for interpolating between two processes by rotating the stirring member at a speed between the speeds of the stirring members.   The table milling machine according to claim 1, wherein a plurality of milling courses of milled rice to polished rice and polished rice to polished rice are defined.   The desktop rice mill according to claim 1 or 2, wherein four stirring members are extended in the radial direction to prevent hunting.   The table rice mill according to any one of claims 1 to 3, wherein in the rice milling process, the rotation speed of the stirring member is continuously or stepwise reduced, or the continuous reduction and stepwise reduction are combined. . A method of polishing rice while stirring the brown rice contained in a container by rotation of a stirring member rotatably supported in the container,
Rotating the stirring member at a relatively high speed to scrape off the brown rice surface;
Reducing the rotation speed of the stirring member and continuing the rice polishing;
A finishing step of improving the breaking of rice by further reducing the rotational speed of the stirring member to give the rice an action of polishing the surface of the rice.

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