JP2000126625A - Rice milling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate variance in rice milling by kind of rice and also to prevent rice from breaking and to reduce temperature rise of rice by blowing air to rice during rice milling in a rice milling machine of such a type that unpolished rice is agitated in a vessel to contrive rice milling. SOLUTION: This rice milling machine is provided with a detection circuit 20 for detecting the speed of revolution of a motor, a variable speed circuit 21 for making variable the speed of revolution of the motor, a control panel 8 for inputting data of rice to be milled, a memory 26 for giving driving data of the motor according to a set value on the control panel 8, and a controller 7 for controlling the variable speed circuit 21 so that the speed revolution of the motor detected by the detection circuit 20 becomes the speed of revolution given by the memory 26. And air blowing blades rotated linked with the rotation of rice milling blades to blow air into a rice milling vessel are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a household rice mill, and more particularly to a rice mill having a desired degree of whiteness within a predetermined time.

[0002]

2. Description of the Related Art A household rice mill has been developed to meet the needs of storing rice in brown rice and eating it just before eating so as not to impair the taste of rice, or eating brown rice without completely whitening in consideration of nutrition. ing. Conventionally, as shown in Japanese Utility Model Publication No. 63-13793, this type of rice milling machine has a cylindrical outer container having a bottom and an eye which is installed in the outer container with an interval from the inner peripheral wall of the outer container. A milled cylindrical rice mill, a milling blade attached to a drive shaft provided on the bottom surface of the outer container and rotatable in the milling vessel, and a motor for rotating the drive shaft, the milling vessel It is known that brown rice to be fed is debranched by rotation of milled rice blades. Such a rice mill generally has means for setting the amount of rice to be milled and the degree of milling, and controls the driving time of the motor in accordance with the settings.

[0003]

However, in such a conventional apparatus, when rice is still close to brown rice at the initial stage of rice polishing, the rotating load is large and the number of revolutions of the motor is reduced, and conversely rice polishing proceeds. In a state close to white rice, a phenomenon occurs in which the rotational load is small and the number of rotations of the motor increases,
It was difficult to keep the rotation speed constant. Therefore, there is a problem that rice cannot be polished with a desired degree of milling within a set time depending on the type of rice such as old rice and new rice, and a problem that rice is broken due to excessive rotation due to a high rotation speed.

Further, in such an apparatus, unlike the type in which brown rice passes through the milling cylinder, the rice is stirred in the milling vessel for a certain period of time. Because of being deprived, there is a problem that the taste of rice is spoiled and rice cracks are easily caused. Therefore, a first object of the present invention is to control the rotation speed of the motor so as to keep it constant, thereby eliminating variations in the polished rice due to the type of rice and preventing rice cracking. The purpose of the present invention is to blow air to the rice in the milled rice to reduce the temperature rise of the rice.

[0005]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention provides an outer container detachably attached to a main body and a predetermined distance from an inner surface of the outer container. A milling container that is installed and made of a metal mesh material having a finer stitch than rice grains, a rotating shaft protruding from the bottom of the milling container, milling blades that are attached to and detached from the rotating shaft, and a motor that rotationally drives the rotating shaft And detection means for detecting the number of rotations of the motor, and transmission means for varying the number of rotations of the motor, such that the number of rotations of the motor detected by the detection means becomes a predetermined constant number of rotations. And a control means for controlling the speed change means.

[0006] The motor drive data for controlling the speed change means by the control means is given by the storage means based on the data of the rice to be milled inputted by the setting means.

In order to solve the second object, the present invention provides an outer container detachably attached to a main body,
A rice milling container that is installed at a predetermined distance from the inner surface of the outer container and is made of a metal mesh material having a finer stitch than rice grains,
A rotating shaft protruding from the bottom of the milling container, a milling blade attached to and detached from the rotating shaft, and a motor for rotatingly driving the rotating shaft;
A blower is provided which rotates in conjunction with the rotation of the rice-milling blades and blows air into the rice-milling container. Preferably, the blowing means is a blowing blade integrally formed on the upper end of the rice polishing blade.

[0008]

According to the present invention, the drive data of the motor, that is, the number of rotations and the drive time of the motor are given to the storage means according to the rice data set by the setting means, that is, the amount and the degree of milling of the rice. During the rice polishing operation, by detecting the number of rotations of the motor, the magnitude of the rotation load is detected by the decrease or increase of the number of rotations, and the detected number of rotations is set to the number of rotations given by the storage means. Constant speed control is performed. The constant speed control of the motor is performed by changing the duty ratio to the motor.

[0009] When the rice polishing operation is started, the blades for the rice polishing are rotated, and the brown rice is convected and rubbed between the rice and the rice and between the rice and the inner surface of the rice polishing container. Then, the blowing blade integrally formed at the upper end of the rice polishing blade rotates in conjunction therewith to blow air to the brown rice.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to the drawings. FIG. 1 is an explanatory internal sectional view showing a rice mill according to one embodiment of the present invention. 1 is an L-shaped rice milling machine main body, 2 is a main body 1
Outer container 3 attached to and detached from the upper surface of the L-shaped horizontal portion of the main body 1
This is the motor 3 provided in the vertical part of the mold. The outer container 2
It has a cylindrical shape with a bottom, has a double structure in consideration of soundproofing, and is attached to the main body 1 by a bayonet connection which is fixed by screwing the lower side. In addition, a cylindrical portion 10 is formed at the inner bottom of the outer container 2 and rises in a cylindrical shape, so that the bran peeled off by the milled rice can be stored in the outer container 2.

Reference numeral 9 denotes a rice milling container attached to the outer container 2, which is formed of a metal net-like material having a shape such that its cross section becomes smaller toward the bottom and having a mesh smaller than the rice grains. On the outer bottom surface of the rice polishing container 9, there is provided a cylindrical mounting portion 11 that fits into a cylindrical portion 10 formed on the inner bottom portion of the outer container 2, and the rotating shaft 4 passes through the center of the mounting portion 11. At the lower end of the rotating shaft 4, an upper coupling 5 connected to the lower coupling 6 on the main body 1 side is attached. Although not shown, the rice mill 9 is attached to the outer container 2 by fitting a vertical rib provided on the attachment portion 11 side to a slit provided on the convex portion 10 side. When the rice polishing container 9 is mounted in the outer container 2 in such a configuration, the upper coupling 5 on the rice polishing container 9 side and the lower coupling 6 on the main body 1 are connected, and the rotation of the motor 3 is transmitted via the belt transmission unit. Communicated,
The rotation shaft 4 is rotated.

Reference numeral 12 denotes a milling blade attached to the tip of the rotating shaft 4. The milling blade 12 extends substantially horizontally from the lower side of the master 13 toward the inner surface of the milling vessel 9, and the tip stands vertically. It is composed of a plurality of raised blades 14 and a blower blade 15 formed integrally with the upper end of the main body 13 and blowing air into the rice polishing container 9 by rotation. As a result, the brown rice put in the rice polishing container 9 is forcibly circulated as indicated by the arrow line a to produce the polished rice, and is blown as indicated by the arrow line b to prevent a rise in the temperature of the rice in the polished rice.

A controller 7 exposes an operation panel 8 on the upper surface of the main body 1 above the controller, and controls the motor 3 in accordance with an input operation on the operation panel 8. Reference numeral 16 denotes a lid that covers the upper opening of the outer container 2, and 17 denotes a handle provided outside the outer container 2. Either or both of the outer container 2 and the lid 16 are made of a transparent material such as plastic or glass. The inside of the outer container 2 can be observed from outside.

FIG. 2 is a block diagram showing a control system of the embodiment. Reference numeral 19 denotes a drive circuit for the motor 3, which includes a detection circuit 20 for detecting the number of revolutions of the motor 3, and a transmission circuit 21 for increasing / decreasing the current supplied to the motor 3 (that is, increasing / decreasing the duty ratio). The rotation number detection circuit 20 amplifies a current change appearing on the power supply waveform due to the contact between the brush and the coil accompanying the rotation of the motor, pulsates the change, and measures the time between pulses to obtain a relative rotation number. It is. The speed change circuit 21 changes the relative rotation speed by cutting off the current supplied to the motor 3 in a predetermined cycle unit and adjusting the ON time and the OFF time.

The operation panel 8 has a rice milling amount selection key 22 for setting the amount of rice to be milled, a milling degree selection key 23 for selecting a milling degree, and a start for starting and stopping the operation. A / stop key 24, a motor rotates only while inputting, and an additional milling key 25 for compensating for insufficient milling are provided. The milling amount is from 1 to 5 go, and the degree of milling is 3 minutes. You can choose between whitening and polishing white rice.

FIG. 3 is a table for setting the time of the rice polishing operation stored in the memory 26 built in the controller 7. When milling rice, the time required for milling varies depending on the amount of brown rice and the degree of milling (the time required for milling is longer as the amount is larger and the degree of milling is higher).
The table shown in FIG. 3 is stored in the memory 26 built in the controller 7 and the milling amount selection key 22 and the milling degree selection key 2 are stored.
The driving time of the motor is set according to the amount of milled rice and the degree of milling set in step 3. In this embodiment, the minimum value a (about 2 minutes)
Milling time is set in 20 steps up to the maximum value t (about 8 minutes).

The operation and usage in the embodiment will be described below. Put the weighed brown rice into the milling container 9, select the desired milling amount and milling degree with the milling amount selection key 22 and the milling degree selection key 23 on the operation panel 8, and press the start / stop key 24. 12 rotates to start milling. As the blades 12 rotate, the rice at the bottom of the milling vessel 9 is pushed outward by the rotating blades 14 and the rice in the center of the milling vessel 9 flows down along the blade main body 13 instead. The convection occurs as in a, whereby the rice grains mainly rub against each other and the epidermis is peeled off. At this time, the exfoliated bran is blown into the outer container 2 from the mesh portion of the rice polishing container 9 by the rotational force of the rice polishing blades 12, and mainly to the inner bottom corner (portion b in FIG. 1) of the outer container 2. Although the rice is deposited, the outer container 2 is cylindrical while the rice container 9 has a hopper shape. Therefore, the clearance between the rice container 9 and the outer container 2 is secured in the portion where the rice is easily deposited, and the rice bran is concentrated. It is possible to prevent the bran from returning to the rice polishing container 9 even if the rice is accumulated.

When the rice polishing blades 12 rotate, the blower blades 15 integrally formed at the upper end thereof also move, and the rice cleaning containers 9 are rotated.
It rotates so as to blow air as indicated by arrow c. By this blowing, the temperature rise of the rice due to friction is alleviated, and it is possible to prevent a decrease in taste due to the milled rice. According to the experiment, it was demonstrated that the temperature can be lowered by about 2 to 3 degrees by the blowing blade 15.

In such a milling operation, the rotation speed of the motor 3 is constant (desirably about 2000 to 2200 rpm) irrespective of the setting of the amount of milling and the degree of milling.
Is controlled so that At this time, in the early stage of rice polishing, which is a state of brown rice, the rotational load is large and the motor speed is reduced, and as the polishing proceeds, the rotational load is reduced and the motor rotational speed is increased. Therefore, control is performed such that the rotational speed of the motor is detected at a predetermined timing, and the rotational speed is increased when the rotational speed is lower than a specified value, and is decreased when the rotational speed is increased.

FIG. 4 shows this control. When an interrupt signal is input at a predetermined timing, the rotation speed detection circuit 20
The rotation speed data R1 fetched by the controller 7 is compared with the specified motor rotation speed R (2). Here, if R> R1, the transmission circuit 21 is controlled to increase the duty ratio of the motor, that is, the power supply time to the motor, in order to increase the rotation speed of the motor (3). If R <R1, control is performed so that the power supply time to the motor is reduced by the transmission circuit 21 in order to reduce the rotation speed of the motor (4). Therefore, the motor 3 always rotates at the same rotation speed regardless of the state of the rice, and it is possible to prevent shortage of rice and cracking of rice. FIG. 5 shows the change in the number of revolutions over time, in which the dotted line represents the conventional rice mill and the solid line represents the rice mill of the present invention.

After the elapse of the milling time corresponding to the set milling amount and milling degree, the motor 3 is stopped and the milling is completed. Here, if the user wants to further refine the rice by checking the actual degree of rice polishing, the rice polishing operation is performed only while the rice is being input by pressing the additional rice polishing key 25, and the rice is observed through the transparent lid 11. It is only necessary to release the additional rice polishing key 25 at an appropriate place. When the milling is completed, the outer container 2 is removed from the apparatus main body 1 and then the milling container 9 is removed from the outer container 2, so that rice remains in the milling container 9 and bran remains in the outer container 2.
You can take out and use each one.

This embodiment is configured as described above.
It is apparent that the present invention is not limited to the above-described embodiment, and various embodiments can be considered without departing from the scope of the claims.

[0023]

As described above, the present invention is constructed as described above, and is a rice-milling machine of the type in which rice is milled by rotating rice-milling blades in a rice-milling container. However, since the rotation speed of the motor can be varied so that the detected rotation speed becomes the specified rotation speed, the rotation speed of the motor can be kept constant,
The desired milling can be performed in a certain milling time irrespective of the amount and type of rice, and rice cracking can be prevented.

[0024] Further, during the rice milling operation, the blowing blades for blowing air to the rice are rotated in conjunction with the whitening operation by the rice milling blades, so that the temperature of the rice is prevented from rising, and the rice is milled without impairing the taste of the rice. It can be performed.

[Brief description of the drawings]

FIG. 1 is an internal sectional view showing a rice mill according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a control system according to the embodiment.

FIG. 3 shows a memory 2 built in a controller 7 of the embodiment.
FIG. 8 is a diagram showing a table for setting the time of the rice polishing operation stored in No. 8;

FIG. 4 is a flowchart illustrating motor control according to the embodiment.

FIG. 5 is an explanatory diagram showing a change over time of a motor rotation speed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Outer container 8 Operation panel 9 Milling container 12 Milling blade 15 Blowing blade 19 Drive circuit 20 Revolution number detection circuit 21 Transmission circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Oya 1825 Amemiya Amemiya, Koshoku City, Nagano Prefecture (72) Inventor Hiroshi Shimizu 1825 Amemiya Aomiya, Koshoku City, Nagano Prefecture FK Term, MK Seiko Co., Ltd. 4D043 AA03 DA03 DH23 DH71 FA10 HA05 HB08 HB10 JA09 JA14 JA19 JB06 JC03 JC04 JD01 LA12 LA18 MA04 MB04

Claims (4)

[Claims] 1. An outer container detachably attached to a main body, a rice mill container made of a metal net-like material provided at a predetermined interval from an inner surface of the outer container and having a stitch finer than rice grains, A rotating shaft protruding from the bottom of the milling container, a milling blade attached to and detached from the rotating shaft, a motor for rotating and driving the rotating shaft, detecting means for detecting the number of rotations of the motor, and the number of rotations of the motor. A rice milling machine, comprising: variable speed change means; and control means for controlling the speed change means so that the number of rotations of the motor detected by the detection means becomes a predetermined constant number of rotations. 2. The rice mill according to claim 1, further comprising: a setting unit for inputting data of the rice to be milled; and a storage unit for supplying drive data of the motor in accordance with a value set by the setting unit. The rice mill according to claim 1, wherein the control means controls the speed change means based on motor drive data provided by the storage means. 3. An outer container detachably attached to a main body, a milled rice container made of a metal net-like material having a stitch finer than rice grains and provided at a predetermined distance from an inner surface of the outer container. A rotating shaft protruding from the bottom of the milling container, a milling blade attached to and detached from the rotating shaft, a motor for rotating and driving the rotating shaft, and rotating in conjunction with the rotation of the milling blade to rotate inside the milling container. A rice mill comprising a blowing means for blowing air. 4. The rice mill according to claim 3, wherein said blowing means is a blowing blade integrally formed on an upper end of the rice polishing blade.