JP2000218179A - Rice milling machine - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to maintain the rotation speed of the motor during rice polishing at a constant level, and to obtain rice that is set according to the setting of the number of rice mills and the degree of milling. is there. [Constitution] A rice milling selection key 22 for setting the amount of brown rice to be milled in a rice milling machine of a type in which rice is convected in a rice mill 9 made of a metal mesh material having a finer mesh than rice grains to scrape bran. A rice milling degree selection key 23 for setting the rice milling degree of brown rice, a rotation number detection circuit 20 for detecting the rotation number of the motor 3, a rotation number variable circuit 21 for changing the rotation number of the motor, The controller 7 controls the rotation speed variable circuit 21 so that the rotation speed of the motor detected by the circuit 20 maintains a predetermined rotation speed R.

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 rice milling degree within a predetermined time.

[0002]

2. Description of the Related Art Household rice mills have been developed to meet the needs of storing rice in brown rice and milling immediately before eating so as not to impair the taste of rice. 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.

[0003]

However, in such a conventional rice milling machine, the rotational load applied to the motor changes according to the amount of rice milling, the progress of milling, the type of brown rice milled, and the storage period. There is a problem that it is difficult to keep the rotation speed constant. In other words, in a rice-milling machine of the type that removes bran by convection of brown rice in a rice-milling container, the rotational load of the motor varies depending on the amount of rice milling. However, when the rotation speed of the motor is reduced, and the rice is polished and the rice is advanced, the phenomenon that the rotation load is small and the rotation speed of the motor is increased occurs in a state close to white rice, and it is difficult to keep the rotation speed constant. In this way, if the rotation speed of the motor fluctuates during the milling operation, even after the given milling time has elapsed, depending on the type of brown rice to be milled and the storage condition, the milling is insufficient, or the milling is excessive, Variations occur in the condition of the milled rice. Therefore, it is not possible to satisfactorily mill rice only by setting the milling time such as 2 minutes to mill rice for one set and 4 minutes for two sets.

[0004] In addition, there is a similar problem in the case of performing so-called fractional rice polishing in which nutrients are considered and all of the bran is left without being scraped off to some extent, and the rice polishing time required from brown rice to white rice is simply reduced. It was not possible to mill rice to the desired degree of milling simply by shortening it.

[0005] In response to this problem, the applicant has conducted various experiments. As a result, the rice mill blades were rotated so that the rotation speed during milling was always kept constant, regardless of the magnitude of the rotation load. And found that a proportional relationship can be obtained between the milling time and the milling degree regardless of the condition of the milling. In other words, if the rotation speed of the milling blades can be kept constant, the desired milling can be performed by simple control of lengthening and shortening the milling time. The present invention has been invented on the basis of such knowledge, and keeps the rotation speed of the motor during rice polishing constant, so that rice can be polished according to the setting of the number of polished rice and the degree of polished rice. It is intended to do so.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rice milling machine of the type in which rice is convected in a rice mill made of a metal mesh material having a finer mesh than rice grains to remove bran. In the above, milling amount setting means for setting the amount of brown rice to be milled, milling degree setting means for setting the milling degree of brown rice to be milled, rotation speed detecting means for detecting the rotation speed of the motor, rotation speed of the motor And a control means for controlling the rotation speed variable means so that the rotation speed of the motor detected by the rotation speed detection means maintains a predetermined rotation speed.

[0007] The apparatus further comprises storage means for storing the amount of milled rice which can be set by each setting means and the drive time of the motor in accordance with the degree of milling. The control means detects the number of rotations during the drive time of the motor given by the storage means. The motor is driven so as to control the rotation speed of the motor by controlling the motor and the rotation speed variable means.

[0008] Further, there is provided storage means for storing a duty ratio of the motor at the start of milling in accordance with the milling quantity set by the milling quantity setting means. The motor drive is started at the motor energization rate given by the storage means based on the set rice polishing amount.

[0009]

According to the present invention, the rotation speed of the motor and the driving time of the motor are set by setting the amount of milled rice and the degree of milling.
When started, the rice milling blades rotate, convection the brown rice, and the rice is rubbed between the rice and the rice and the inner surface of the rice polishing container, and the rice is removed by bran removal. During the rice polishing operation, the rotation speed of the motor is constantly detected by the rotation speed detecting means. If the rotation speed is higher than a predetermined rotation speed, the rotation speed is decreased, and if the rotation speed is lower than the predetermined rotation speed, the rotation speed is increased. Feedback control is performed to control the rotation speed varying means so that the rotation speed is changed. Detection of the number of rotations of the motor is performed by extracting a change in current appearing on the AC waveform at the time of rotation of the AC brush motor, and increasing or decreasing the number of rotations of the motor intermittently energizes the motor and increases or decreases the energizing time. It is done by doing. Therefore, only by setting the amount of rice to be milled and the degree of milling by the setting means, the desired milled rice can be obtained. In addition, since the rice is started at the motor energization rate that corresponds to the amount of rice to be milled, the rotation can be set to the appropriate rotation immediately, without causing rice scattering or cracking, and smooth rice milling operation. Is started. As a result, almost the desired rice was obtained irrespective of the type, age, amount and degree of rice polishing.

[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. With such milling blades 12, the brown rice put into the milling container 9 is forcibly circulated as indicated by an arrow line a, thereby polishing the rice, and is blown as indicated by an arrow line b, so that the temperature of the rice in the milled rice is increased. Preventing the rise.

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 of the motor 3, which includes a rotation number detection circuit 20 for detecting the rotation number of the motor 3, and a rotation number variable circuit 21 for turning on and off the power supply to the motor 3. The motor 3 employs an AC brush motor that outputs a high torque and a high rotation speed. The rotation speed detection circuit 20 includes a current detection resistor 20a and an amplification circuit 2 for amplifying a power supply AC waveform.
0b and a filter circuit 2 for extracting a current waveform generated by contact between a brush and a coil accompanying rotation of the AC brush motor 3 from a power supply AC waveform amplified by the amplifier circuit 20b.
0c, and a waveform shaping circuit 20d for shaping the current waveform extracted by the filter circuit 20c. The rotation speed variable circuit 21 is configured by a switching circuit that cuts off the power supply to the motor 3 in a predetermined cycle unit.

The operation panel 8 has a rice milling amount selection key 22 for setting the amount of rice to be milled, a rice milling degree selection key 23 for setting the degree of milling such as milling, and the like, for starting and stopping the operation. The start / stop key 24 and an additional milling key 25 for rotating the motor only while inputting, to compensate for insufficient milling, are provided.
Up to 5 go, the degree of milling can be selected from 3 minutes milling to milled rice and polished rice.

FIG. 3 is a table for setting the rice polishing operation data stored in the memory 26 built in the controller 7. When performing rice polishing, the time required for rice polishing differs depending on the amount of brown rice and the degree of rice polishing (the time required for rice polishing becomes longer as the amount and the degree of rice polishing increase).
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 milling amount and milling degree set in step 3. In this embodiment, the milling time is set in 20 steps from the lowest value a to the highest value t. Note that the settings other than the polishing of white rice are such that the specified rotation speed R during the rice polishing operation is constant, and the polishing speed of the white rice polishing is set at a lower rotation speed r.

The setting of the motor energization rate at the start of milling according to the milling amount takes into consideration that the rotational load at the start of milling differs depending on the milling amount (for example, 1 go and 5 go), and is appropriate regardless of the setting. This is for starting the rice polishing at the rotation speed. The duty ratio of the motor in this embodiment changes by switching the on / off timing of the motor, and indicates that the power is supplied for N1 cycles and disconnected for N2 cycles. The maximum value E is set in accordance with the total number.

The operation and use of the embodiment will be described below. Put the weighed brown rice in 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. In the main routine, the motor is driven at the motor energization rate at the start of rotation set in the memory 26 in accordance with the milling amount and the milling degree set on the operation panel 8 (for example, if the milling amount is 1 and the milling degree is When all rice is set, rice polishing is started at the duty ratio A in FIG. 3), and the rice polishing blades 12 rotate to start rice polishing. 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.

The controller 7 finishes the milling after the milling time given by the milling amount and the milling degree has passed (for example, when the milling amount is 1 and the milling degree is set to all milling, the milling time p in FIG. 3 is used). Milling is finished). 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. Just take it out and use it.

During such milling operation, the number of rotations is detected at predetermined timings, and the number of rotations of the motor 3 is set at the above-mentioned specified number of rotations R regardless of the setting of the amount of milling or the degree of milling. (Approximately 2000-2200 rpm is desirable)
Is controlled so that At this time, when the amount of milled rice is large, the load of rotation is large.On the contrary, when the amount of milled rice is small, the load of rotation is small. It is large, and the state is such that the rotational load decreases as the rice polishing proceeds.
Therefore, the rotation speed of the motor is detected at a predetermined timing,
When the rotation speed is lower than the reference rotation speed, the control is performed to increase the rotation speed, and when the rotation speed is higher than the reference rotation speed, the control is performed to decrease the rotation speed.

FIG. 4 is a flow chart showing this control. When an interrupt signal is input at a predetermined timing, the rotation speed of the motor detected by the rotation speed detection circuit 20 is fetched (1), and the rotation speed fetched by the controller 7 is obtained. The number R1 is compared with the specified rotational speed R (2). Here, if R> R1, a signal for increasing the energization time to the motor by one cycle is sent to the rotation speed variable circuit 21 in order to increase the rotation speed of the motor, and the energization rate of the motor is increased (3). If R <R1, a signal to reduce the motor energization time by one cycle to reduce the motor energization time is sent to the rotation speed variable circuit 21 to reduce the motor energization rate (4). Is going.

Here, the control for varying the number of revolutions will be described with reference to FIG. 5. When the duty of the motor 3 at the number of revolutions detected in the process (1) in the flowchart of FIG. In the case of the cycle disconnection (FIG. 5A), in the process (3), control is performed to extend the energizing time by one cycle for 6 cycles-10 cycles disconnection (FIG. 5B), while in the process (4), four cycles are performed. Control is performed to cut off the energization time by one cycle for the energization minus 12 cycles (FIG. 5c). As a result, the motor 3 always keeps the specified number of revolutions R, and a stable rice milling operation is performed. FIG. 6 shows the change in the number of revolutions over time. The dotted line represents the conventional rice mill and the solid line represents the rice mill of the present invention.

After the milling time has elapsed and the milling operation has been completed, if it is desired to mill the rice a little more by checking the actual milling degree of the rice, the additional milling key 25 can be pressed to add the milling operation. At this time, since the motor 3 can be driven only while the additional rice polishing key 25 is being input, the rice can be observed through the transparent cover 11 and the additional rice polishing key 25 can be released at an appropriate place. Also at this time, it is needless to say that the driving of the motor 3 is executed based on the above-described rotation speed detection and the rotation speed variable control.

Further, the present invention has a function of polishing white rice as one of the settings of the degree of rice polishing. The difference between the white rice polishing operation and the above-described rice polishing operation will be described.
Polishing of white rice is for scraping the surface of white rice that has been discolored due to a long storage period or poor storage conditions of the rice, and has a lower rotational speed r (approximately 16
The rotation is performed by driving the motor at 00 to 1800 rpm. This is because white rice has low frictional resistance between rice, so that if the rotation speed is too high, the rice will not be able to convect well and the whole rice cannot be polished. To start the operation, put white rice in a milling container instead of brown rice, select polishing rice with the milling degree selection key 23, select the amount of white rice to be polished with the milling amount selection key 22, and then start / stop key 24. Is started, and the motor is rotated at the start duty ratio of the motor according to the amount of white rice (for example, at the time of 1 go, the duty ratio F in FIG. 3). Then, irrespective of the amount of white rice, the motor rotates while being held at a lower rotational speed r than during the rice polishing, and the rice is rubbed between the rice and the inner surface of the rice polishing container while slowly convectioning the white rice, and the surface of the white rice is polished. It can be raised.

Even when the white rice polishing is set, if additional polishing is desired, time can be added with the additional rice polishing key 25. The driving time of the motor according to the amount of white rice and the duty ratio of the motor at the start when white rice polishing is selected are as shown in FIG. 3, and the driving time from the lowest value u to the highest value y from 1 to 5 is shown. , The lowest value F
The motor duty ratio is set to the maximum value J. And
The drive times u to y are set shorter than the complete milling times p to t.

This embodiment is configured as described above.
The present invention is not limited only to the above embodiment. For example, in the above-described embodiment, the rotation is always controlled at a constant rotation speed regardless of the amount of milled rice and the degree of milling (excluding polishing of white rice).
Set the number of rotations according to the amount of milled rice, such as 200 rpm,
The milling time may be fixed. In this case, the control for keeping the rotation speed constant at each rice milling amount is as follows:
This is the same as the detection of the rotation speed of the motor and the rotation speed variable control described above, and the data of the rotation speed may be stored instead of the milling time in the table of FIG.

[0028]

Since the present invention is constructed as described above, the present invention is a rice milling machine of the type that mills rice by rotating rice milling blades in a rice milling container. The rotation of the motor changes according to the amount of milled rice and the progress of the milled rice. The number of rotations can be monitored at a predetermined timing, and the number of rotations of the motor can be varied so that the detected number of rotations becomes a specified number of rotations. Optimum rice polishing can be performed within a short period of time, and rice cracking due to excessive rotation speed and rice shortage due to insufficient rotation speed are eliminated.

Further, a function for setting the amount of milled rice and milled rice can be set, and milled rice can be easily set according to the user's request.
Since the setting is only to change the driving time of the motor, accurate polishing can be realized with a simple circuit.

Further, when starting the rice polishing, the duty ratio of the motor according to the amount of the rice polishing is set, so that the rice polishing can be started smoothly regardless of the setting, and during the rice polishing operation. It is possible to quickly start up at a constant rotation speed.

[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.
8 is a diagram showing a table No. 8. FIG.

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

FIG. 5 is an explanatory diagram showing control for varying the number of revolutions in the embodiment.

FIG. 6 is an explanatory diagram showing a change over time of the motor rotation speed.

[Explanation of symbols]

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

Continued on the front page (72) Inventor Hiroshi Shimizu 1825 Amemiya Amemiya, Kohan, Nagano Pref.

Claims (3)

[Claims] An outer container detachably attached to a main body, a rice mill container made of a metal mesh material having a mesh smaller than rice grains and provided at a predetermined distance from an inner surface of the outer container; In a rice mill having a rotating shaft protruding from the bottom of a rice milling container, a milling blade attached to and detached from the rotating shaft, and a motor for rotatingly driving the rotating shaft, a milling amount setting means for setting an amount of brown rice to be milled. Milling degree setting means for setting the degree of milling of brown rice to be milled, rotation number detecting means for detecting the rotation number of the motor, rotation number variable means for changing the rotation number of the motor, and rotation number detecting means. A rice mill comprising a control means for controlling the rotation speed varying means so that the detected rotation speed of the motor maintains a predetermined rotation speed. 2. The rice mill according to claim 1, wherein a driving time of said motor according to a rice milling amount set by said rice milling amount setting means and a rice milling degree set by said rice milling degree setting means is stored. Storage means, wherein the control means controls the rotation speed detection means and the rotation speed variable means to control the motor so that the rotation speed of the motor is kept constant during the driving time of the motor given by the storage means. A rice mill characterized by being driven. 3. The rice mill according to claim 1, further comprising: storage means for storing a duty ratio of the motor at the start of milling according to the milling quantity set by the milling quantity setting means. A rice milling machine characterized by controlling the rotation speed varying means to start driving the motor at a motor duty ratio given by the storage means based on the rice polishing amount set by the rice polishing amount setting means.