JP6546119B2 - Rice milling machine - Google Patents

Description

  The present invention relates to a rice milling machine.

  In order to solve problems such as poor rice chipping in milling, poor food taste due to temperature rise of rice due to generation of frictional heat, and troublesome maintenance due to rice bran and rice jam in Patent Document 1 Tabletop rice milling machines for home use are disclosed.

  The rice milling machine has a motor, a grinding wheel fitted with a drive shaft that rotates according to the rotation of the motor, and rotates with the drive shaft, and a cylindrical peripheral side periphery and a circular bottom portion concentric with the drive shaft. A lid for covering the upper opening of the rice basket and having a transparent part, and a rice re-soiling button for rotating the motor to perform re-rice after rice finishing. It is configured to be equipped.

  The side circumference of the rice basket is made of metal mesh, and when rice is milled, the brown rice is put in the rice basket and the motor is rotated to rotate the rice blade, whereby the rice is agitated by the rotation of the rice grain. The rice bran is scraped off by the mesh of the metal mesh of the side circumference of the rice milling basket, and the scraped-out straw is scraped off, and the scraped-off straw is ejected from the mesh to the outside.

Japanese Patent Laid-Open No. 2000-24527

  However, the table-top rice milling machine disclosed in Patent Document 1 has a plurality of vertical frames to prevent twisting due to the pressure applied at the time of rice milling because the rice milling basket is composed of wire mesh. There is a problem that the cost is increased due to the increase in the number of parts and the complication of the manufacturing process, for example, the need for reinforcement.

  In addition, it is configured such that stirring is performed by the rotation of the rice milling blade and the rice is rubbed against the mesh of the wire mesh of the rice milling basket by centrifugal force to scrape the straw and the scraped away is thrown away from the mesh by centrifugal force. The rice on the blade surface inclined at an angle of 15 ° to 35 ° with respect to the horizontal plane is urged upwards and stirred, but a sufficient stirring effect is obtained to contact the rice above it In addition, there is a problem that variation in the degree of milled rice is likely to occur and a problem that it takes time for milled rice.

  SUMMARY OF THE INVENTION In view of the above-described conventional problems, it is an object of the present invention to provide a domestic rice polishing machine which can obtain a sufficient stirring effect of rice inside the rice basket, can efficiently mill rice, and can reduce costs. is there.

In order to achieve the above-mentioned object, the first characterizing feature of the rice milling machine according to the present invention is, as described in claim 1 of the document of the claimed invention, a straw container for accumulating straw separated from rice; A bottomed cylindrical milled rice bowl provided inside a crucible container, a rotary shaft passing through the crucible container and the rice basket, and a rotary shaft rotatably attached to the rotary shaft, and rice set in the rice basket The bottom of the rice milling basket is formed on an inclined surface which inclines downward from the central portion to the peripheral wall, and the peripheral wall of the rice milling basket is formed with a large number of holes. The stirring member includes a plurality of columnar extending members extending radially from the rotating shaft, and the extending member has a lower surface along the inclined surface of the bottom of the rice milling basket. It is in the point provided in .

The rice introduced into the rice milling basket is rubbed against the peripheral wall portion of the rice milling basket by the centrifugal force applied while being stirred as the stirring member rotates. At that time, the rice is rubbed against the edges of the many holes formed in the peripheral wall portion and the rice cake is scraped off, and the rice cake separated from the rice is discharged from the many holes and collected in the rice cake container. When the stirring member is rotated, the rice moves from the central portion to the peripheral wall portion one after another along the inclined surface which is formed at the bottom portion of the rice milling basket and inclines downward from the central portion to the peripheral wall portion. After the rice moved to the vicinity of the peripheral wall is pushed upward along the peripheral wall, the rice falls to the central portion side of the rice basket. That is, inside the rice milling basket, the rice moves from the central lower region to the peripheral wall and rises along the peripheral wall to generate a circulating flow moving to the central upper portion, and the peripheral wall and the rubbing are equally applied to all the rice. Will be given a chance to become homogeneous. And since the said surrounding wall is comprised by the plate-shaped body, even if many rice collides, a surrounding wall does not twist, therefore, since it is not necessary to provide the flame | frame etc. for reinforcement, it can comprise at low cost.
In addition, when the extending member is formed in a columnar shape and the lower surface is provided along the inclined surface of the bottom of the rice milling basket , the rice is formed in a curved surface when the rice is urged in the rotation direction of the columnar body. Since it is biased while moving up and down along the outer peripheral surface of the columnar body, more stable settling can be achieved without the action of a large force such as cracking of rice.

According to a second feature of the invention, as described in the second aspect of the invention, in addition to the first feature described above, the extension member is formed of a cylindrical body having a hollow inside.
If the columnar body is a cylindrical body in which a cavity is formed, a motor with a small torque can be used.
The third feature structure, as described in the claim 3, in addition to the first feature configuration described above, a plurality of protrusions protruding on the inner surface of the polished rice basket to the plate-like body is formed It is on the point.

  When the rice moving in the vicinity of the peripheral wall hits the projection, the moving direction changes, and when it collides with other rice, the flow of the circulating rice within the rice milling basket is shaken, and it circulates in a turbulent state . In addition, the collision with the projection also increases the chance of scraping off the brow. As a result, even if the rotation speed of the stirring member is low, the re-enforcement can be efficiently performed.

The fourth characterizing feature of the can, as noted in the claim 4, in addition to the third characterizing feature described above, in that the projection is formed so as to be distributed over the entire peripheral wall of the plate-like body is there.

  Since the opportunity for rice that flies upward in the vicinity of the peripheral wall to come in contact with the projections distributed over the entire peripheral wall of the plate-like body is sufficiently secured, the kinetic energy of the rice is reduced at that time, Cracking of rice caused by collision with rice containers or collision between rice is effectively suppressed.

According to a fifth feature of the present invention, as described in the fifth aspect, in addition to the third or fourth feature described above, the projections are arranged in a staggered manner on the plate-like body.

  The contact opportunity per unit area with the rice which is about to rise upward in the vicinity of the peripheral wall can be made uniform, and the uniform and efficient refining becomes possible.

According to a sixth characterizing feature of the present invention, as described in the sixth aspect, in addition to any of the first to fifth characterizing features described above, the plate-like body is made of a punching metal.

  Compared with metal mesh, the probability of the adhesion of wrinkles in the hole of punching metal is low, and since it can be easily detached, stable milling performance can be maintained over a long period of time.

  As described above, according to the present invention, a sufficient rice stirring effect can be obtained inside the rice milling basket, and it is possible to provide a domestic rice milling machine that can efficiently mill rice and can reduce costs. The

(A) is a longitudinal sectional view of a rice milling machine, (b) is a sectional view of a rice milling basket (A) is a plan view of a rice milling machine according to the present invention, (b) is a side view thereof, (c) is a perspective view thereof (A) is a plan view of a rice milling basket, (b) is the same side, (c) is the same perspective view Side view of the main part with the outer cover of the rice milling machine removed Illustration of the rotary drive mechanism of the rice milling machine (A) to (d) illustrate the stirring member (A) to (c) illustrate the extending member (A), (b) is explanatory drawing of the processus | protrusion which shows another embodiment (A) to (c) are explanatory views of extension members of other shapes The another embodiment of a rice milling basket is shown, (a) is a perspective view of a rice milling basket provided with a holding part, (b) is the top view, (c) is a sectional view taken along the line A-A in FIG. (A), (b) is an explanatory view of the attachment state of the support plate provided with a power transmission mechanism and the circuit board Illustration of the electric circuit that drives the rice milling machine Timing chart of motor drive control by control unit Flow chart of motor drive control by control unit The other embodiment is shown and the flowchart of motor drive control by a control part is shown.

Below, an example of the rice milling machine which comprises this invention is demonstrated based on drawing.
1 (a) and 1 (b) show the cross-sectional structures of the rice milling machine 1 and the rice milling basket 3, respectively, and FIGS. 2 (a) to 2 (c) show the appearance of the rice milling machine 1. FIG.

  The rice milling machine 1 comprises a crucible container 2 for accumulating rice bran separated from rice, a bottomed cylindrical rice milling basket 3 provided inside the container 2, and a rotary shaft 4 penetrating the crucible container 2 and the rice meal basket 3. And, the stirring member 5 attached to the rotating shaft 4 so as to be able to rotate and which refines the rice introduced into the rice milling basket 3 is detachably accommodated in the bottomed cylindrical casing A.

  The casing A is formed in an oval shape in a plan view, and a lid B is provided for opening and closing an opening A1 for throwing the rice into the rice milling basket 3 accommodated in the casing A. A plurality of operation buttons C are disposed on the upper surface of the casing A at the side portion of the lid B, and the control board CB1 is disposed below the operation buttons C.

  The control board CB1 is equipped with a microcomputer and peripheral circuits for switching and controlling the milling time and / or rotational speed by driving a motor M described later according to the operation on the operation button C.

  As the operation button C, a rice milling button C1 for starting a rice milling operation, a rice milling amount setting button C2, a rice milling degree setting button C3, and a grade selection button C4 are provided. The rice milling amount from 1 to 5 is set by the rice milling amount setting button C2, the rice milling degree is set to 5 stages by the rice milling degree setting button C3, and the brand is set by the brand selecting button C4. .

  When four representative stocks and other stocks are selectable by the stock selection button C4 and the other stocks are selected, the selection of the milling degree setting button C3 becomes valid and the stocks are selected. Regardless of the setting of the degree-of-milling setting button C3, it is configured to be milled to a preset optimum degree of milling.

  A display device D composed of a plurality of LEDs corresponds to each button so that the set state or the selected state can be visually confirmed corresponding to each of the rice amount setting button C2, the rice degree setting button C3 and the grade selection button C4. Are arranged.

  Optimal milling time and / or rotational speed and the like are previously determined by experiments etc. for each grade and amount of milled rice, and the values are stored in a memory provided on the control board CB1. When a particular brand is selected, the milling time and / or rotational speed for that brand is read from the memory and controlled.

  The optimum milling time and / or rotational speed refers to the milling degree and the milling speed at which favorable whiteness can be obtained, which is set on the basis of the degree of milling and whiteness, and which is a favorable taste for each brand. The setting standard of the milling time and the rotation speed is not limited to the taste or whiteness of each brand, and other factors may be added.

  As shown in FIG. 1A, FIG. 4 and FIG. 5, the motor M is accommodated in the side of the crucible container 2 in the casing A, and the rotary shaft 4 is rotationally driven through the power transmission mechanism 10. Is configured. A drive-side pulley P1 fitted to the output shaft 11 of the motor M, a drive transmission shaft 12 connected to the rotary shaft 4 via a coupler 40, and a driven pulley P2 fitted to the drive transmission shaft 12; A power transmission mechanism 10 is constituted by a belt 13 connecting the pulleys P1 and P2.

  Fins F are provided on the lower surface side of the driving pulley P1 and configured to suck outside air when the motor M rotates to cool the inside of the apparatus in which the motor M, the control circuit board, and the like are disposed. Moreover, if the temperature of rice rises due to friction at the time of milling, there is a possibility that the taste will fall, so it may be configured to cool the rice by forming an air path leading the outside air sucked by the fins F to the rice milling basket 3 . Instead of the fins F, a dedicated cooling fan may be provided to guide the cooling air to the rice basket 3.

  The crucible container 2 whose center of the bottom is raised upward is accommodated in the casing A so as to be penetrated by the rotary shaft 4 and the rice milling basket 3 formed concentrically with the crucible container 2 is accommodated thereon. The stirring member 5 is fitted into the rotary shaft 4 extending upward from the central portion of the bottom portion 3A of the base 3 so as to rotate integrally.

  A plurality of legs 2 </ b> A are provided at the bottom of the crucible container 2 and placed on the support plate of the power transmission mechanism 10. In addition, it is also possible to aim at reduction of a vibration by arrange | positioning anti-vibration rubber in leg part 2A.

  The stirring member 5 includes a rod-like portion 51 and a stirring blade 52, which is an example of an extension member integrally attached below the rod-like portion 51. The rod-like portion 51 has, for example, a hexagonal cross section The recess is pierced, and a rotary shaft 4 with a slightly smaller cross-sectional hexagonal shape is fitted to rotate integrally with the rotary shaft 4. The rotary shaft 4 and the rod-like portion 51 may be integrally rotated, and both may be engaged by a spline mechanism or a key mechanism.

  A rice milling basket 3 is shown in FIG. 1 (b) and FIGS. 3 (b) and 3 (c). The bottom portion 3A of the rice milling basket 3 is formed on the inclined surface 31 which inclines downward from the central portion to the peripheral wall portion 3B, and the circumferential wall portion 3B of the rice milling basket 3 is a plate member 30 made of metal in which a large number of holes 32 are formed. It consists of The inclined surface 31 is set at an inclination angle θ in the range of 5 ° to 15 °, preferably about 10 ° ± 3 °, with respect to the horizontal plane.

  The plate-like body 30 is made of a punching metal made of SUS304, and a plurality of herringbone-shaped elongated holes arranged in the lateral direction as a large number of holes 32 are punched and formed in a plurality of steps in the vertical direction. The length of each long hole is about 8 ± 0.5 mm, the width is about 0.5 to 1.0 mm, the horizontal pitch between the long holes is about 3 ± 0.5 mm, and the vertical pitch between the long holes is 15 ± It is set to a value of about 0.5 mm.

  Further, a plurality of projections 33 are formed on the plate-like body 30 by a press molding method so as to protrude to the inner surface side of the rice milling basket 3. The projections 33 have a diameter of about 10 mm and a height of about 2.5 mm, and corner portions are formed in a curved surface, and are arranged in a staggered manner so as to be evenly distributed at intervals of about 10 mm from the lower part to the upper part of the plate-like body 30 There is. The vertical pitch of the projections 33 in the same row is about 20 mm, the horizontal pitch of the projections 33 in the same row is about 40 mm, the horizontal pitch between adjacent columns is about 20 mm, and the vertical pitch between adjacent rows is about 10 mm There is.

  The rice introduced into the rice milling basket 3 is rubbed against the peripheral wall of the rice milling basket 3 by the centrifugal force applied while being stirred as the stirring member 5 is rotated, and at that time, a large number of holes 32 formed in the peripheral wall portion 3B. The rice is rubbed against the edge of the container to scrape the rice cake, and the rice cake detached from the rice is discharged from many holes and collected in the rice cake container 2.

  As shown by the white arrow in FIG. 1 (b), rotation of the stirring member 5 causes the bottom surface 3A of the rice milling basket 3 to be formed along the inclined surface 31 which slopes downward from the central portion to the peripheral wall portion 3B. The rice moves from the central portion to the peripheral wall portion 3B one after another, and the rice moved to the vicinity of the peripheral wall is pushed upward along the peripheral wall by the pressure of the rice moved later and drops to the central portion side of the rice milling basket 3.

  That is, in the rice milling basket 3, the rice moves from the central lower region to the peripheral wall, and rises along the peripheral wall to generate a circulating flow moving to the central upper portion. You will be given the opportunity to be scolded, and you will be homogeneous

  Since the peripheral wall portion 3B is formed of a plate-like body, sufficient strength is secured even when a large number of rice collides, so that the peripheral wall does not twist, and therefore, it is necessary to provide a frame or the like for reinforcement There is no

  When the rice moving in the vicinity of the peripheral wall hits the projection 33, the moving direction changes, and when it collides with other rice, the flow of the circulating rice in the rice milling basket 3 is shaken, and it circulates in a turbulent state become. In addition, the collision with the projection 33 also increases the chance of scraping off the brow. As a result, even when the number of rotations of the stirring member 5 is low, the kneading can be efficiently performed.

  In the vicinity of the peripheral wall portion 3B, the opportunity for rice that flies upward to come in contact with the projections 33 distributed over the entire peripheral wall portion of the plate-like body is sufficiently secured, and at that time the kinetic energy of the rice is reduced As a result, the cracking of the rice caused by the collision of the rice with the container 3 or the collision of the rice can be effectively suppressed.

  Furthermore, since the projections 33 are staggered so as to be evenly distributed at short intervals from the lower portion to the upper portion of the plate-like body 30, contact opportunity per unit area between rice and the projections 33 flying upward in the vicinity of the peripheral wall Can be made uniform, and can be refined uniformly and efficiently.

  In addition, since the probability that wrinkles adhere to the holes 32 of the punching metal is low as compared with the metal mesh and it can be easily detached, stable milling performance can be maintained over a long period of time.

  In the embodiment described above, an example in which the plurality of projections 33 are formed by the press molding method so as to protrude to the inner surface side of the rice milling basket 3 has been described, but the projections 33 formed of separate members are attached to the inner surface of the rice milling basket 3 May be

  Such projections 33 are shown in FIGS. 8 (a) and 8 (b). The flat plate 33a is pressed to form the projections 33 at a constant pitch, and the legs 33b extending laterally to the left and right are inserted from the inner surface of the rice milling basket 3 into the holes 32 of the peripheral wall and caulked You can get a basket.

The stirring member 5 provided with the rod-like portion 51 and the extending member 52 will be described.
As shown in FIGS. 5 and 6 (a) to 6 (d), the rod-like portion 51 has a small diameter cylindrical body 51a having a circular cross section and a large diameter cylindrical body 51c having a circular cross section under the small diameter cylindrical body. Agitating blades, which are a pair of extending members, so as to be smoothly connected by the truncated cone-shaped connecting portion 51b and to be point-symmetrical in plan view with respect to the central axis of the rod portion 51 at the lower end of the large diameter cylindrical body 51c. 52 are disposed radially projecting.

  As shown in FIGS. 7 (a) to 7 (c), the stirring blade 52 is connected via a connecting portion 52b extending in the radial direction from the center of the annular base 52a having the same diameter as that of the large diameter cylindrical body 51c. Furthermore, two blade main bodies 52c having an L-shaped cross section and protruding in the radial direction are provided. The stirring blade 52 is made of the same material as the rice milling basket 3.

  The connecting portion 52b is formed to extend from the center of the annular base 52a so as to be inclined at an angle φ1 in the opposite direction to the radial direction, and the blade main body 52c is further inclined at an angle φ2 in the opposite direction with respect to the connecting portion 52b. Is configured. In the present embodiment, both φ1 and φ2 are set to about 30 ° ± 5 °, and the angle φ1 + φ2 = φ is set to about 60 ° ± 10 °.

  The two blade main bodies 52c having an L-shaped cross section are set to the same value as the above-described inclination angle θ with respect to the horizontal surface so that the lower surface 52d is along the inclined surface 31 of the bottom 3A of the rice milling basket 3. Further, the upper end of the rising portion 52e of the blade main body 52c is maintained in the horizontal posture, and the vertical width is gradually increased as the distance from the center in the radial direction is increased.

  When the stirring blade 52 rotates, the rice is pushed forward in the rotational direction diagonally, that is, not in the circumferential direction but in the radial direction by the rising portions 52e of the blade main body 52c. As a result, the rice moves diagonally to the peripheral wall of the rice milling basket 3, and is rubbed by the large number of holes 32 in the peripheral wall so that the rice cake is scraped off.

  Further, since the lower surface 52d of the stirring blade 52 is formed in a shape following the bottom shape of the rice milling basket 3, an abnormal force is applied to the rice moving from the center to the peripheral wall along the bottom of the rice milling basket 3. It is possible to avoid the occurrence of inconvenient situations such as rice cracking.

  Furthermore, the gap between the bottom 3A of the rice milling basket 3 and the lower surface 52d of the stirring blade 52 is larger than white rice and smaller than the brown rice, and between the bottom 3A of the rice milling basket 3 and the lower surface 52d of the stirring blade 52 But they are configured to be homogeneous.

  The stirring blade 52 may be formed in a curved shape as long as it is configured to be bent in the opposite rotational direction as it goes radially outward in a plan view. Further, the number of stirring blades is not limited to two, and three or more may be provided.

  An adapter for adjusting the gap between the bottom 3A of the rice milling basket 3 and the lower surface 52d of the stirring blade 52 may be provided between the annular base 52a and the large diameter cylindrical body 51c depending on the type of rice. The stirring blade 52 may be replaced by the above to adjust the gap. In addition, a plurality of stirring blades 52 may be prepared in advance so as to use stirring blades 52 having different shapes and sizes depending on the type of rice.

  The other example of the stirring member 5 provided with the rod-shaped part 51 and the extension member 52 is shown by FIG. 9 (a), (b), (c). The same components as those in the previous example are given the same reference numerals. Only the differences will be described below.

  In the previous example, the extending member 52 further extends in the radial direction via the connecting portion 52b extending in the radial direction from the center of the annular base 52a having the same diameter as the large-diameter cylindrical body 51c. In the present embodiment, the extension member 52 is made of the material SUS304, and the proximal end side is attached to the large-diameter cylindrical body 51c, and the tip end is made up of a stirring blade having two V-shaped blade main bodies 52c. Is constituted by a pair of columnar bodies 52f having a circular cross section whose free end is. For example, although it can attach by screwing the external thread formed in the base end side surface of the columnar body 52f to the internal thread formed in the large diameter cylindrical body 51c, the attachment structure is particularly limited. Not too.

  The pair of columnar bodies 52f are arranged to extend toward the side wall of the rice milling basket 3 at an angle of 180 ° from the outer periphery of the large diameter cylindrical body 51c in plan view, and the lower surface of the columnar bodies 52f is polished in side view It is formed in a shape following the shape of the bottom 3A of the car 3, and the gap between the bottom 3A of the rice milling car 3 and the lower surface of the extension member is larger than white rice and smaller than brown rice.

  When the stirring member 5 is rotated, the rice is urged in the rotational direction by the columnar body 52f and moves toward the peripheral wall portion 3B of the rice milling basket 3 by the centrifugal force. The rice is rubbed by the edges and the like of the many holes 32 formed in the peripheral wall portion 3B, the rice cake is scraped off, and the rice cake separated from the rice is discharged from the many holes and collected in the rice cake container 2.

  When the rice is urged in the rotational direction of the columnar body 52f, it is urged while moving up and down along the outer peripheral surface of the columnar body 52f formed on the curved surface, so a large force that the rice is broken is A more stable treatment is possible without acting. If the columnar body 52f is formed of a cylindrical body in which a cavity is formed inside, a motor M with a small torque can be used. The diameter of the columnar body 52f is preferably set in the range of 5 mm to 8 mm.

  10 (a) to (c) show the attachment structure of the grip portion of the rice milling basket 3. As shown in FIG. A ridge 3D extending in the radial direction is formed at the upper edge opening 34 of the rice milling basket 3, and a recess 3E for positioning and storing the container 2 in two radial directions of the ridge 3D is formed There is. A pair of attachment holes 3F of the grip portion 35 are formed at a position shifted by 90 ° from the formation position of the recessed portion 3E.

  The gripping portion 35 is a metal rod-like member having a circular cross section with a diameter of about 1 mm, and formed in a semicircular arc shape slightly smaller in diameter than the diameter of the rice milling basket 3. Both end portions 35A of the grip portion 35 are bent along the radial direction of the rice milling basket 3, and are rotatably inserted and fixed in the mounting holes 3F. The gripping portion 35 rotates between the mounting hole 3F and a gripping posture in which the top portion 35B of the gripping portion 35 stands up from the collar portion 3D, and a storing posture in which the top portion 35B is housed in the upper edge opening 34 It can be changed.

  Between the opening 34 of the rice milling basket 3 and the peripheral wall 3B, a step 34A having a width of about 1 mm in a plan view is formed. The top portion 35B is formed to have a curvature larger than the curvature of the semicircular grip portion 35, and the tip end portion of the top portion 35B is configured to be received by the step portion 34A in the storage posture.

  The stepped portion 34A is formed so as to be slightly inclined inward, and is configured so that rice flowing in the inside of the rice milling basket 3 during milling may fall on the inside of the rice milling basket 3 along the inclined surface even if it runs over the stepped portion 34A. It is done. Further, the diameter of the gripping portion 35 is set to be several mm smaller than the diameter of the peripheral wall portion 3B of the rice milling basket 3 so that the rice which has run on the step portion 34A falls from the gap between the opening 34 and the gripping portion 35 It is done.

  FIG. 11A shows the arrangement of the support plate 80 and the circuit board CB2 on which the crucible container 2 and the motor M are placed. A power transmission mechanism 10 is disposed below the support plate 80, a reflection type photointerrupter 73 for detecting the number of rotations of the rotary shaft 4 is disposed on the front surface of the circuit board CB2, and power devices are provided on the back surface of the circuit board CB2. It is arranged.

  As shown in FIG. 11B, a light reflective marker 13M having a width of about 15 mm is provided on the surface of the belt 13 connecting the pulleys P1 and P2, and the photointerrupter 73 detects the passing timing of the marker 13M. The rotation number of the motor M can be detected. The marker 13M is made of a white paint applied to the surface of the belt 13, but the color of the paint is not particularly limited. The marker 13M may be configured by affixing a light reflective tape or the like other than paint to the surface of the belt 13.

  The electric circuit 6 provided with the control part 7 which controls the rice milling machine 1 is shown by FIG. In the drawing, a circuit block indicated by an alternate long and short dash line is a circuit block provided on the control board CB1 disposed below the operation button C, and the other circuit blocks are disposed on the circuit board CB2. The control unit 7 in the circuit block provided on the control board CB1 may be provided on the circuit board CB2.

  The DC regulator 63 and the diode bridge circuit 66 are connected via the common mode filter 62 to a pair of power lines N and L to which AC voltage is supplied from the AC plug 60, and the DC voltage converted by the diode bridge circuit 66 is DC. The motor M is configured to be applied.

  In the power line N, a semiconductor relay (triac) 65 is provided on the upstream side of the diode bridge circuit 66, and a resistor 64 for current measurement is connected on the upstream side of the semiconductor relay (triac) 65. A fuse 61 for overcurrent protection is connected to the power line L, and a switch 67 for detecting the attachment / detachment state of the lid B to the casing A is connected downstream thereof. The switch 67 has a function as a safety switch, and the control unit 7 is configured such that the motor M is not activated even if the rice polishing button C1 is operated if the lid B is not attached to the casing A.

  The zero cross circuit 71 is connected between the AC plug 60 side of the power line N upstream of the resistor 64 and the AC plug 60 side of the power line L after the switch 67 is turned on, and the zero cross pulse generated by the zero cross circuit 71 Is input to the control unit 7.

  The zero cross circuit 71 is configured to include a resistive voltage divider circuit that monitors the AC voltage between the power lines N and L, and a comparator that binarizes the AC voltage divider extracted from the resistive voltage divider circuit. The zero cross pulse which raises and lowers on the basis of is generated.

  The zero cross pulse is input to the interrupt signal terminal of the microcomputer constituting the control unit 7 to identify whether the frequency of the AC power supply is 50 Hz or 60 Hz, and the cycle of the zero cross pulse, that is, the interrupt cycle is It is used for drive control of the semiconductor relay 65 in order to adjust the rotation speed of the motor M. The internal clock of the microcomputer is used to measure the drive time of the motor M.

  Since the zero cross pulse is output from the zero cross circuit 71 only when the switch 67 is closed, the controller 7 closes the switch 67 when the zero cross pulse is input, that is, the cover B is mounted on the casing A When the zero cross pulse is not input, it can be identified that the switch 67 is open, that is, the cover B is detached from the casing A.

  Further, the output of a reflection type photo interrupter 73 for detecting the number of rotations of the rotating shaft 4 driven by the motor M is input to the control unit 7 via the amplification circuit 74 and stops when the temperature of the motor M rises abnormally. The output of the thermistor 75 for temperature monitoring is input to the control unit 7 for control.

  The DC 5 V DC voltage output from the DC regulator 63 is configured to be supplied to a DC load including the control unit 7. The control board CB1 includes an SW matrix in which contacts of a plurality of operation buttons C such as the above-described rice milling amount setting button C2, milling degree setting button C3, and brand selection button C4 are arranged in a matrix in addition to the control unit 7. A display LED matrix for dynamic lighting of a plurality of LEDs for displaying a selected state, a matrix scanning circuit for scanning them, a buzzer for notifying completion of milling, etc., and a milling button C1 for starting milling It is done.

  In the existing rice milling technology, the number of rotations of the motor M is switched on the condition of only the passage of time. However, depending on the storage condition of brown rice and the environmental conditions at the time of milling, there may be a big difference in the finished condition of milled rice by controlling only time. Therefore, in the present embodiment, by detecting the current value of the motor M at the time of milling, that is, the load at the time of milling, highly accurate milling control can be performed without being influenced by the environment or the like.

  FIG. 14 shows the procedure of the milling control executed by the control unit 7. When the rice milling button C1 functioning as the start switch is operated after setting the rice milling conditions such as brand name and the amount of rice milling (S1), the semiconductor relay 65 is driven to output a constant voltage (DC output of the diode bridge circuit 66 At three times, DC of about 65 V) is applied to the motor M to drive it, and measurement of the current value flowing through the motor M is started via the resistor 64 (S2).

  Thereafter, when the peak value of the current is detected (S3), the target rotation speed N1 and the rotation time T1 of the motor M in the first stage are set (S4), and the motor M is controlled to rotate at the rotation speed N1 for the time T1. When the predetermined time T1 elapses (S6), the target rotation speed N2 and the rotation time T2 of the motor M in the second stage are set (S7), and the motor M is controlled to rotate at the rotation speed N2 for the time T2, and the predetermined time T2 When has passed (S8), the motor M is stopped and the buzzer is sounded to notify the end of the milled rice (S9). If, in step S3, a predetermined allowable time has elapsed before the peak value of current is detected (S5), the process proceeds to step S4 without detecting the peak value of current.

  After performing the processes of steps S4 and S7, the control unit 7 monitors the number of rotations of the motor M based on the output of the photo interrupter 73 so that the number of rotations of the motor M becomes the target number of rotations N1 or N2. The on / off duty of the semiconductor relay 62 is controlled to adjust the output voltage of the diode bridge circuit 66 variably.

  FIG. 13 shows the control timing of the motor M described above. When the motor M is started at time t1 and the peak value of the current is detected at time t2, the motor M is driven at the target rotation speed N1 for only the time T1, and at the time t3 when the time T1 has elapsed, the target rotation speed N2 is performed. The motor M is driven by T2, and the milling is finished at time t4 when time T2 has elapsed, and the motor M is stopped.

  The rotation speed (N1, N2) and time (T1, T2) of the motor M at the time of rice milling are set in advance to appropriate values obtained as a result of testing based on combinations of various brands and amount of rice milling, A value which is stored in the storage unit provided in the control unit 7 as table data and which matches the brand selected by the brand selection button C4 and the rice milling amount set by the rice milling amount setting button C2 is read out from the table data.

  The time T1 of the first stage is fixed to a fixed time (60 seconds in the present embodiment), and the time T2 of the second stage is set to a relationship of T2> T1. Further, the rotation speed N1 of the first stage and the rotation speed N2 of the second stage are variably set according to the brand and the amount of milled rice, and are set to the relationship of the rotation speed N1 ≧ N2.

  When the motor M is started and the treatment is started, the load initially becomes high and the current rises. It is determined that the point at which the current shows a peak value is the point at which the load for milling is maximum, and by setting the number of rotations N1 and the rotation time T1 thereafter, stable milling control while avoiding cracking of rice Can be realized.

  Then, most of the soot layer is scraped off during the time T1 in which the motor M is driven at the rotational speed N1 and then the motor M is driven for the time T2 at a rotational speed N2 lower than the rotational speed N1 Will be

A tolerance time is set in case the time point at which the current shows the peak value can not be detected, and the occurrence of cracking of rice or the like due to excessive precipitation is avoided. Normally, the allowable time is set to 20 seconds + α seconds (α is a margin time, 5 seconds in the present embodiment), using an index that the current peak value can be detected about 20 seconds after the start of the motor M. In addition, when exceeding the set allowable time, motor rotation speed N1 and time T1 which were memorize | stored by the combination of brand name and the amount of rice milling are similarly used.

  The safety circuit is provided with a safety circuit that fuses the fuse 61 if an excessive current flows in the motor M, but if the current flowing through the resistor 64 exceeds the preset current upper limit, the motor M is stopped. A safety control may be incorporated.

  Another control example is shown in FIG. In this example, after setting the milling conditions such as brand and milling amount, when the milling button C1 functioning as the start switch is operated (S11), the semiconductor relay 65 is driven and the DC output of the diode bridge circuit 66 A certain constant voltage is applied to and driven by the motor M, and measurement of the current value flowing through the motor M is started via the resistor 64 (S12).

  Thereafter, when the peak value of the current is detected (S13), the time Δt required for the current to reach the peak after activating the motor M is determined, and the first step is performed based on a predetermined function with Δt as a variable. The time T1 is variably set (S14, S15). The subsequent processing from step S16 to step S19 is the same as the processing from step S6 to step S9 in FIG. 14 described above.

  The predetermined function is not particularly limited. For example, based on the fact that the current peak value can be detected about 20 seconds after the start of the motor M, if .DELTA.t is 20 seconds or more as the standard time, a value obtained by multiplying the value of .DELTA.t-20 by a predetermined constant V It can be configured to be added to the time T1 of the table data stored in the storage unit.

  For example, if Δt = 30, then T1 = 60 + (30−20) × V. If V = 3, then T1 = 60 + 10 × 3 = 90.

  Milled rice is largely attributable to the ease of removal of the outermost layer of brown rice. Therefore, it can be judged that it is difficult to mill rice that one having a long time Δt until the current peak is detected is brown rice. Therefore, when the time Δt is long, more milling time can be used compared to the short time, so that the milling conditions at the end of the first stage can be made equal, so the control of the second stage is the same as before. The embodiment can be used as it is.

  If the time Δt is less than the standard time, it can be determined that the chewing layer has peeled off to a level equivalent to the standard time at that time, so it is preferable to adopt the time T1 of table data stored in advance in the storage unit . However, in the same manner as described above, the trimming time T1 of the first stage may be variably set based on a predetermined function having Δt as a variable. For example, if Δt is less than 20 seconds in standard time, a value obtained by multiplying the value of 20−Δt by a predetermined constant V may be subtracted from time T1 of table data stored in advance in the storage unit. it can.

  The above-described rice milling machine is only one embodiment of the present invention, and the scope of the present invention is not limited by the description, and the specific structure, shape, and the like of each part within the scope of achieving the effects of the present invention. It goes without saying that the size, material, etc. can be changed and designed as appropriate.

1: rice milling machine 2: rice cake container 3: rice milling basket 3A: bottom 3B: peripheral wall 30: plate-like body 31: inclined surface 32: hole 33: projection 34: opening 34A of milling basket 34: stepped portion 35: gripping portion 4 : Rotating shaft 5: Stirring member 51: Rod portion 52: Extension member (stirring blade, rod-like body)
52a: annular base 52b: connection portion 52c: blade main body

Claims (6)

A container for collecting firewood separated from rice,
A bottomed cylindrical rice milling basket provided inside the crucible container,
A rotating shaft passing through the crucible container and the milling basket;
A stirring member rotatably mounted on the rotary shaft and refining the rice introduced into the rice milling basket;
It is a rice milling machine equipped with
The bottom portion of the rice milling basket is formed into an inclined surface which inclines downward from the central portion to the circumferential wall portion, and the circumferential wall portion of the rice milling basket is constituted by a plate-like body in which a large number of holes are formed,
Wherein the agitation member is provided with a plurality of columnar extending member extending radially from said rotary shaft, said extension member is provided so as bottom surface along the inclined surface of the bottom portion of the rice basket A rice milling machine.   The rice milling machine according to claim 1, wherein the extending member is formed of a cylindrical body whose inside is hollow.   2. The rice milling machine according to claim 1, wherein the plate-like body is provided with a plurality of projections projecting to the inner surface side of the rice milling basket. 4. The rice milling machine according to claim 3, wherein the projections are formed to be distributed over the entire peripheral wall of the plate-like body. The rice grain processing machine according to claim 3 or 4, wherein the projections are arranged in a staggered manner on the plate-like body. The rice machine according to any one of claims 1 to 5 , wherein the plate-like body is made of punching metal.

Images