JP2006239518A - Electric milling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a household milling machine in which a space between a lower millstone and an upper millstone can be kept uniform without a change in the space around the lower millstone or partial deviation of a pressure, and which therefore can provide flour of the similar grain size to that of the flour obtained by a conventional manual millstone, and can be made light in weight and small in size. <P>SOLUTION: The electric milling machine 1 has a quern in which the upper millstone 31 and the lower millstone 32 with the lower side and the upper side being in slidable contact with each other are coaxially arranged, the upper millstone 31 is fixed in a non-rotatable manner, and the lower millstone 32 is rotatably supported by a drive source 41 via a deceleration means 43. The electric milling machine 1 is provided with: a space adjustment mechanism 33 to adjust the space between the upper millstone 31 and the lower millstone 32; an elastic supporting means 39 to elastically apply the upward pressure to a plurality of parts of a lower side of the lower millstone 32 other than the center part thereof; a quern having a space adjustment mechanism 33 to adjust the space between the upper millstone 31 and the lower millstone 32, and an elastic supporting means 39 to elastically apply the upward pressure to a plurality of parts of the lower side of the lower millstone; and a coarsely grinding mill 7 between a quern 3 and a hopper 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a grinding mill in which two flat cylindrical stone mills are stacked one above the other, and a grain is put between them to turn one stone into a powder, and a household with which a powder having a desired particle diameter can be obtained. This invention relates to an electric grinder for use.

  Recently, for hobbies and allergy countermeasures based on homemade tastes, there are cases where homemade udon and soba noodles are eaten or bread-baked, and the demand for homemade flour is also demanded. Has occurred. Therefore, it is desired to provide an electric grinder that can be used easily without requiring much labor at home. In particular, there is a case where you want to make bread with rice flour as a countermeasure against allergies that do not adapt to the body such as wheat flour or buckwheat flour, but it is difficult to obtain rice flour suitable for rice bread production, so there is a demand for milling at home as a countermeasure There is. In order to meet such demand, the present invention relates to an electric grinder that automatically drives a stone mortar with a driving source such as a motor to perform milling.

  Conventionally, in this type of electric grinder for home use, the upper and lower mortars are often made of metal. This is because when a natural stone such as granite is used as the mortar, the material to be pulverized is pulverized and pulverized using the weight of the mortar itself, resulting in a large mortar and a large and complicated drive mechanism. This is because it is not suitable for home use. However, since the taste of powder is better with a natural stone mill than with a metal mill, there is a need for a household electric grinder that can obtain a powder similar to that of a traditional manual mill.

  By the way, the reason why delicious powder can be obtained by grinding powder with a stone mill is roughly described as follows in “Shigeo Miwa, Coin Books 3“ Recommendation of Stone Mill ”, Kuori, published in 1978”.

  ・ There is no powder burning. In modern high-speed mills, the grinding energy is 100 to 10,000 times that of a millstone, and this energy is instantaneously concentrated in the local part of the grain during grinding, and after grinding, It spreads locally and generates extremely high heat instantaneously. This destroys grains and other tissues. There is no such problem with a stone mill.

  ・ Confinement crushing. Because it is pulverized while confined in the eye of a stone mill, it does not touch a large amount of high-speed airflow. Therefore, the scent does not fly and the generation of dust is small.

  ・ Blending effect. The millstone has the effect of kneading on the millstone surface simultaneously with grinding. This is a state where fine particles are coated around large particles, and it has a great effect on taking advantage of the natural taste.

  ・ Ventilation effect. The groove of the mortar surface, especially the groove of the upper mortar, has good air permeability and prevents heat trapped in the mortar surface. Therefore, even if the pulverized surface is continuously pulverized, the temperature does not rise above the body temperature.

  ・ Shear grinding effect. Rather than hitting with a stone mortar, pulverization is carried out mainly by the action of peeling off with a truncation force. This has the effect of crushing without damaging the layered structure inherent to the substance.

  • Stone rough surface effect. Even if the mortar is made of a metal or grindstone that has the same rough surface as that of the stone mortar, it does not produce the same grinding effect. This is because of the fine surface structure of the stone surface, which catches the particles and prevents heat generation due to sliding friction.

  ・ Particle size distribution. When pulverized with a stone mill, the particle size is not so uniform. Coarse particles and fine particles are mixed. Mechanical milling has a uniform grain size but monotonous taste. For example, there is a combined effect in which coarse powder has a flavor and fine powder has a stickiness.

  Because of this effect, powder ground with a stone mill is respected and its flavor is loved.

  By the way, what was disclosed by the following patent document 1 is known as a conventional flour mill. As shown in FIG. 4, the mill 100 has an upper stone 117 and a lower stone 116 that are slidably in contact with each other on the lower surface and the lower stone 116 so that the upper stone 117 is non-rotatably fixed and the lower stone 116. Is supported rotatably by a driving source 114 through speed reducing means 110, 111a to 111c, 112a, 112b, and the upper stone 117 is forcibly pressed against the lower stone 116 via a bolt 119 by an appropriate resilient means 118. It consists of the structure which has.

  The upper stone mortar 117 is forcibly pressed against the lower stone mortar 116 by the resilient means 118. However, if the strength of the contact pressure of the resilient means 118 can be adjusted, a contact pressure suitable for the type of grain can be set. The grind should be good. However, if the rotating lower millstone 116 is supported only by the drive shaft that pivotally supports the center only by changing the pressing force of the upper millstone 117 that is firmly fixed, the grains to be ground between the upper and lower millstones are not. When interposed, the distance between the upper and lower stones 117 and 116 in the center and the distance between the upper and lower stones 117 and 116 in the peripheral part change, and the distance between the upper and lower stones 117 and 116 in the peripheral part varies depending on the location. Since it changes, the state of the milled powder is not constant. Therefore, the mill 100 needs a strong rotating member 113 that supports the lower stone mortar 116, and requires a complicated rotation speed reduction mechanism including an internal gear. Further, the lower stone mortar 116 can be made thinner. However, since the milling apparatus cannot be made light and small, there is a problem that the apparatus is expensive and unsuitable for home use.

Another type of milling machine disclosed in Patent Document 2 below is also known. As shown in FIG. 5, the milling machine 120 has a fixed crusher 126 on the upper side and a rotary crusher 127 on the lower side, and an intermediate base plate 125c is arranged on a machine base plate 125a by a separation shaft 125d. A bearing cylinder member 128 is vertically installed on the base plate 125c, and a slide cylinder 128a is fitted in the bearing cylinder member 128 so as to be vertically slidable. A spindle 129 is vertically installed on the slide cylinder 128a by a bearing 128b so as to be rotatable. A rotary crusher 127 is detachably attached to 129 via an attaching / detaching mechanism 130, and a fixed crusher 126 is formed on the bearing cylinder member 128 above the rotary crusher 127 to form a crushing gap H between the opposing surfaces. However, there is a problem that the mechanism is complicated and the device is expensive and unsuitable for home use.
Japanese Patent Laid-Open No. 2002-126546 (FIG. 3, paragraphs [0006] and [0011]) Japanese Patent No. 3326556 (FIG. 6, paragraphs [0010] and [0011])

  As a result of various studies to solve the problems of the conventional milling apparatus as described above, the present inventor has elasticized a plurality of locations other than the central portion of the lower millstone provided facing the fixed upper millstone. The upper mill can be reduced in weight and weight by applying an appropriate pressing force by supporting and pressing upward with the support means, and the particle size of the milled powder can be reduced by lowering the rotational speed of the lower mill. It became the same as a conventional millstone and found that the taste of the powder was improved, and the present invention was completed.

  That is, the present invention does not have a risk that the distance between the lower stone mill and the upper stone mill changes in the periphery of the lower stone mill, or the press contact force is partially biased, and can be kept uniform. It is intended to provide a household grinder that can obtain a particle size similar to that of an old-fashioned manual millstone and can reduce the size and weight of the device.

  Further, in the present invention, an appropriate pressure contact force can be obtained by supporting the lower stone die with an elastic support means having a simple structure, the upper stone die can be reduced in weight, the entire mechanism can be simplified, and economical electric power can be used for home use. It is intended to provide a grinder.

  Further, in the present invention, by using a two-stage structure of a coarse grinding mill and a grinding mill composed of an upper milling stone and a lower milling mill, the milled powder has a particle size similar to that of a conventional manual milling mill. It intends to provide an electric grinder for home use.

  In the present invention, the invention according to claim 1 is characterized in that an upper mill and a lower mill whose bottom surface and upper surface are in sliding contact with each other are arranged coaxially, the upper mill is fixed in a non-rotatable manner, and the lower mill is reduced. An electric grinding machine provided with a grinding mill that is rotatably supported by a drive source through the motor, the electric grinding machine comprises means for adjusting a distance between the upper stone mill and the lower stone mill, and It is characterized by comprising elastic support means for elastically applying an upward pressure to a plurality of locations other than the central portion of the lower surface of the lower stone mill.

  The invention according to claim 2 is the electric grinder according to claim 1, wherein the electric grinder is provided with a coarse grinder between the upper stone mortar and the hopper. The die is driven coaxially with the lower stone die.

  The invention of claim 3 is characterized in that, in the electric grinder according to claim 1 or 2, the rotational speed of the lower stone mill is set to 50 RPM to 70 RPM.

  According to a fourth aspect of the present invention, in the electric grinder according to any one of the first to third aspects, the elastic support means includes a compression coil spring and a ball rotatably supported by the compression coil spring. It is characterized in that it is wrapped with a cylinder and a part of the ball is exposed from the cylinder.

  According to a fifth aspect of the present invention, in the electric grinding machine according to any one of the first to fourth aspects, the means for adjusting the distance between the upper stone mill and the lower stone mill is the pressure contact in the vertical direction of the elastic support means. It is characterized by comprising means for varying the force.

  Further, the invention of claim 6 is the electric grinder according to any one of claims 1 to 5, wherein the upper and lower stone milling surfaces are both horizontal surfaces. Features.

  The invention according to claim 7 is the electric grinder according to any one of claims 1 to 6, wherein the elastic support means supports the lower stone mortar at at least three places.

  Further, the invention according to claim 8 is the electric grinder according to claim 2, wherein the coarse grinding mill part and the grinding mill part are made into a block, can be removed, and can be disassembled. It is characterized by that.

  Further, according to a ninth aspect of the present invention, in the electric grinder according to the second aspect of the present invention, the coarse grinding mill grinds the powder into a powder having a particle size of about 750 to 180 μm, and the grinding mill has a grain size of about 180. It is possible to mill so that powder of ˜60 μm occupies 80% or more.

  According to the first aspect of the present invention, since the lower millstone has a plurality of elastic support means for urging the lower millstone in the direction of the upper millstone, the lower millstone is forcibly applied to the upper millstone fixed while rotating with an appropriate pressure. Press contact. The pressure contact force is dispersed, and a uniform and tight pressure contact force can be applied to the lower surface of the lower millstone. In addition, since the lower millstone is forcibly pressed against the upper millstone, there is no need to increase the weight of the upper millstone, and the weight of the upper millstone can be applied, so the weight of the upper and lower millstones can be reduced. Since the weight can be reduced, the grinder can be reduced in size and weight.

  According to the invention of claim 2, the lower stone has a plurality of elastic support means for urging the lower stone in the direction of the upper stone, and the lower stone is uniformly and tightly attached to the upper stone fixed while rotating at an appropriate pressure. Forced to press. In addition, since the lower millstone is forcibly pressed against the upper millstone, the weight of the upper and lower mills can be reduced, the weight can be reduced, and the electric grinder can be reduced in size and weight. Because it has a coarse grinding mill provided between the grinding mill and the hopper, this two-stage structure has a moderately distributed grain size and has the same flavor as that of a traditional manual mill. Powder can be obtained.

  According to the invention of claim 3, since the grinding mill of the electric grinding machine is a millstone and the rotation speed of the lower millstone is set to a low speed of 50 RPM to 70 RPM, there is no powder burning, confinement grinding, blending effect, ventilation effect, Due to the above-mentioned effects unique to the stone mill such as the shearing and grinding effect and the particle size distribution, a powder having the same taste as the traditional manual millstone can be obtained.

  According to a fourth aspect of the present invention, the elastic support means wraps the compression coil spring and the metal ball rotatably supported by the compression coil spring in a cylinder, and a part of the metal ball is exposed from the cylinder. The lower stone mortar is supported so that a pressing force can be applied through the rotating metal ball of the elastic support means, so that the rotation is not hindered.

  Furthermore, according to the invention of claim 5, by adjusting the distance between the upper stone mill and the lower stone mill, the pressing force in the vertical direction of the elastic support means can be varied, and the contact pressure of the elastic support means can be changed. By setting an appropriate contact pressure suitable for the type of grain, a good grinding condition can be obtained, and a preferable flavor can be obtained by changing the particle size distribution of the flour.

  Furthermore, according to the invention of claim 6, since both the upper and lower millstones have a horizontal plane, the upper millstone and the lower millstone are both horizontal planes. A grinder can be obtained.

  Furthermore, according to the invention of claim 7, since the elastic support means supports the lower millstone in at least three places, the distance between the lower millstone and the upper millstone can be kept uniform.

  According to the invention of claim 8, in the electric grinder according to claim 2, the coarse grinding mill part and the grinding mill part are blocked and can be removed, and each can be disassembled. Easy to maintain and maintain.

  According to the ninth aspect of the present invention, in the electric grinder according to the second aspect, the object to be crushed is pulverized into powder having a particle size of approximately 750 to 180 μm by a coarse grinding die, and the particle size is reduced by the grinding die. It is possible to mill so that approximately 180-60 μm of the powder occupies 80% or more. By grinding into powder of such a particle size, a powder similar to that of an old-fashioned manual millstone with good taste can be obtained. It is done.

  As described above, according to the present invention, it is possible to provide an electric grinding machine in which the upper and lower stone mills are thin, the mechanism of the lower stone mill is simplified, and a delicious flavored powder can be obtained at an economical price for home use. Can do.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies an electric grinder for embodying the technical idea of the present invention, and is not intended to specify the present invention. Other embodiments within the scope are equally applicable.

  FIG. 1 is a front sectional view showing the configuration of the main part of the electric grinder according to the first embodiment. The grinding machine 1 is roughly divided into a hopper part 2, a grinding mill part 3, a driving part 4, a discharge part 5, and a machine base part 6. Although details of the machine base part 6 are not shown, they are formed on a machine base 61. A cylindrical frame 62 is formed by attaching a leg frame to a substrate.

  The hopper 2 has a funnel-shaped introduction cylinder 21 formed in the upper part of the grinder 1, and the upper opening 21a of the introduction cylinder 21 serves as an inlet for the object to be crushed. A possible lid member 22 can also be attached. When the material to be crushed is charged, the material is fed from the introduction port 21b in the central portion to the grinding mill portion 3 at the bottom.

  The grinding mill portion 3 has an upper stone mill 31 and a lower stone mill 32 in which the lower surface and the upper surface are in sliding contact with each other on the same axis, the upper stone mill 31 is fixed so as not to rotate, and the lower stone mill 32 is a main shaft 30 a in the bearing 30. It is attached to a joint 30d connected to, and is rotatably supported. The upper stone mortar 31 and the lower stone mortar 32 are formed of natural stone such as granite, for example, and have a disk shape, and have a diameter of 10 to 20 cm and a thickness of about 20 mm. In addition, when the diameter is about 10 to 20 cm, if the diameter is less than 10 cm, the residence time of the object to be pulverized in the die cannot be sufficiently ground and the desired particle size cannot be obtained. Because. Moreover, if it exceeds 20 cm, the weight of the lower stone mill becomes too heavy, and a large drive source for rotating the mill is necessary, so that the apparatus becomes large and becomes unsuitable for home use.

  The lower surface of the upper stone mill 31 and the upper surface of the lower stone mill 32 are provided with uneven streaks for grinding and grinding the grains. The uneven streaks extend from the inside to the outside of each section of the board divided into a plurality of sections, and the lower stone mortar 32 is inclined rearward in the rotational direction to form a plurality of concave grooves and convex portions. The millstone 31 is formed symmetrically so that the lower millstone 32 intersects the groove directions. The lower stone mortar 32 is pivotally supported by a rotation motor 41 via a speed reduction means 43 of the drive unit 4. In this kind of grinding machine, the upper surface of the lower mill is normally configured as a conical surface projecting upward, and the lower surface of the upper mill is recessed in a conical shape that hangs on the center so as to match it. However, in this embodiment, since the contact surfaces of the upper millstone 31 and the lower millstone 32 are both horizontal surfaces, the milling process is easy and inexpensive and economical electric milling is possible. You can get a chance.

  The gap G between the grinding surfaces of the upper stone mill 31 and the lower stone mill 32 is changed by the gap adjusting mechanism 33, and the contact pressure is appropriately adjusted according to the type of the object to be crushed to improve the grinding condition or milling. It can be adjusted to control the particle size distribution of the powder. The upper stone mill 31 on the fixed side is fixed so as not to move by inserting the claw 35 provided on the upper support base 34 fixed to the machine body 62 and the hopper 2 into the hole 36 on the upper surface, and is firmly held. The rotation-side lower stone mill 32 is accommodated in a vertically movable pan-shaped lower support base 38 that can be moved toward and away from the fixed-side upper stone mill 31 by a lever 37 of the interval adjusting mechanism 33. Then, it is placed and held on elastic support means 39 attached to the bottom of the lower support base 38.

  The elastic support means 39 is provided at a plurality of locations of the lower support base 38 so as to support the lower surface of the lower stone mortar 32, and applies an upward pressure elastically. In this embodiment, the elastic support means 39 wraps a compression coil spring 39a and a ball 39b made of metal or ceramic, which is rotatably supported by a metal plate 39e placed on the compression coil spring 39a, in a cylindrical body 39c. A part of 39b is exposed from the cylindrical body 39c. The elastic support means 39 needs to support at least three points in order to support the lower stone mill 32 without distortion, and supports the lower stone mill 32 at at least three locations. The lower stone mortar 32 is supported so that the pressure contact force of the compression coil spring 39a is applied via the rotating ball 39b of the elastic support means 39, so that the rotation is not hindered.

  Further, the elastic support means 39 may have a vertically movable means 39d in order to vary the pressure in the vertical direction. The movable means 39d may be, for example, a stator having a screw groove that is screwed into a screw thread provided on the outer surface of the cylindrical body 39c, or a ring-shaped ring that can move up and down and supports a plurality of elastic support means 39. A single plate may be used. If the elastic support means 39 has a movable means 39d for changing the pressure in the vertical direction and the contact pressure of the elastic support means 39 can be changed, a more appropriate contact pressure suitable for the type of grain is set. As a result, a good degree of grinding can be obtained.

  As described above, the lower millstone 32 has a plurality of elastic support means 39 for urging the lower millstone 32 in the direction of the upper millstone 31, so that it is forcibly pressed against the upper millstone 31 with an appropriate pressure while rotating. The pressing force is dispersed by the plurality of elastic support means 39, and a uniform and tight pressing force can be applied to the lower surface of the lower stone mortar 32. Further, since the upper stone mill 31 is supported by these elastic support means 39 so as to be in contact with the lower stone mill 32 to which a uniform pressure contact force is applied, powder milled to a desired particle size is obtained. Further, since the lower millstone 32 is forcibly pressed against the upper millstone 31, it is possible to apply a weight more than the weight of the upper millstone 31, so the weight of the upper and lower mills can be reduced and the weight can be reduced. The grinder 1 can be reduced in size and weight.

  The machine base unit 6 constitutes a basic part of the grinding machine 1 and incorporates a power switch and a control part (not shown), and a part thereof supports the rotation motor 41 of the drive unit 4. The rotation motor 41 is mounted with the rotation shaft 42 facing upward, protrudes upward, and is engaged with the speed reduction means 43. The machine base 6 is provided with a timer.

  The rotation motor 41 of the drive unit 4 rotates the lower stone mill 32 via the speed reduction means 43. In the embodiment, as shown in FIG. 2, the speed reduction unit 43 includes a speed reduction mechanism including three stages of gears 43 a to 43 c, and the speed reduction mechanism is mounted between chassis 45 a and 45 b supported by a column 44. Yes. A drive gear 46 is attached to the rotation shaft 42 of the rotation motor 41 attached to the lower surface of the chassis 45a. The intermediate gear 47b is attached between the chassis 45a and 45b by the intermediate shaft 47, the driven gear 43a is attached to the lower end of the main shaft 30a, the initial gear 43c is driven by the drive gear 46 of the motor 41 for rotation, the intermediate gear 43b, the driven The main shaft 30a is rotated at a reduced speed through each gear of the gear 43a, and the lower stone mill 32 is rotated.

  The discharge unit 5 discharges a material to be crushed such as cereal powder pulverized by the grinding mill unit 3. A powder discharge port is formed so as to face the gap G of the grinding mill part 3. A pan-like lower support base 38 is provided with a discharge port 51 near the discharge port, and the powder basket 52 is attached to and detached from the discharge port 51. Arranged freely.

  In each of the above parts, the reduction mechanism is assembled on the drive unit 4 of the machine base unit 6, the grinding mill unit 3 is assembled on the deceleration mechanism, and the hopper unit 2 is assembled on the grinding mill unit 3. It becomes. Then, when grains such as rice to be crushed are put into the hopper, the grains fall from the introduction port 21b in the lower central portion of the introduction cylinder 21 of the hopper to the grinding mill part 3 and are crushed by the grinding mill part 3. After being ground, the powder is collected by a brush (not shown) attached to the lower stone mortar 32 and discharged from a discharge port. An object to be crushed such as cereal powder is stored in a powder basket 52 detachably arranged from a take-out port 51 provided near the discharge port.

FIG. 3: is front sectional drawing which shows the structure of the electric grinder concerning 2nd Example.
Since the basic structure of the grinder of this embodiment is the same as that of the grinder of FIG. 1, the same parts are denoted by the same reference numerals and description thereof is omitted.

  In the embodiment of FIG. 3, a different part from the embodiment of FIG. 1 is that a coarse milling die 7 is provided on the upper portion of the grinding mill portion 3. The mechanism of the grinding portion of the coarse grinding die 7 has a structure similar to that for grinding coffee beans. A hopper receiving cylinder 72 is provided below the introduction cylinder 21 of the hopper. The hopper receiving cylinder 72 is connected to the introduction cylinder 21 to form an introduction path 73, and a fixed coarse grinding blade 74 is provided on the inner peripheral surface thereof. In the center of the hopper barrel 72, a main shaft 30a of the grinding mill part 3 connected to the rotating shaft 42 of the motor 41 for rotation via a speed reduction mechanism, and a third shaft 30c connected via a second shaft 30b. A rotating coarse grinding blade 75 that interlocks with the rotation of the main shaft 30a is provided. Reference numeral 30 denotes a bearing for the main shaft 30a.

  A drive gear 46 is attached to the rotation shaft 42 of the rotation motor 41 attached to the lower surface of the chassis 45a, and the initial gear 43c is interlocked thereto. An intermediate gear 43b is attached to an intermediate shaft 47 provided between the chassis 45a and the chassis 45b, a driven gear 43a is attached to the lower end portion of the main shaft 30a, and a necessary reduction is performed by the rotation motor 41 via the gears 43a to 43c. And the main shaft 30a is rotated.

  The third shaft 30c, which is the shaft of the rotary coarse grinding blade 75, is connected to the second shaft 30b protruding in the concave portion of the upper stone mill 31 of the grinding mill portion 3 so as to rotate. The rotary coarse grinding blade 75 is fixed to the third shaft 30c by tightening a nut, and by removing the nut, the coarse grinding die 7 is disassembled and can be removed. Further, since the grinding mill part 3 can also separate the main shaft 30a and the second shaft 30b, after removing the coarse grinding mill 7, the upper milling part is unfixed, and the upper milling mill 31 and the lower milling mill are removed. 32 can be disassembled and removed. Thus, since the coarse grinding mill part 7 and the grinding mill part 3 are made into blocks, they can be easily removed and disassembled for easy cleaning and maintenance.

  In the grinding machine of this embodiment, the object to be crushed by the coarse grinding blades 74 and 75 is guided to the grinding mill part 3 by the introduction cylinder 76 and dropped into the hole in the central part of the upper stone mill 31. The upper stone mill 31 and the lower stone mill 32 are ground and milled into a powder having a predetermined particle size. When this two-stage pulverization is applied to the production of rice flour, it is pulverized to a powder having a particle size of approximately 750 to 180 μm by the coarse grinding die 7, and a powder having a particle size of approximately 180 to 60 μm is obtained by the grinding die 3. Milling was possible so as to occupy 80% or more. By grinding into a powder with such a particle size, a savory, similar powder as when milled with an old-fashioned manual millstone was obtained. By the way, it took about 30 minutes to make 250 grams of rice flour.

  Also in the present embodiment, the elastic support means 39 is provided at a plurality of locations of the lower support base 38 so as to support the lower surface of the lower stone mortar 32, and applies an upward pressure elastically. The elastic support means 39 of this embodiment wraps a compression coil spring 39a and a ball 39b rotatably supported by a metal plate 39e mounted on the compression coil spring 39a in a cylindrical body 39c, and a part of the ball 39b is a cylinder. It is exposed from the body 39c. The elastic support means 39 needs to support at least three points in order to support the lower stone mill 32 without distortion, and supports the lower stone mill 32 at at least three locations. The lower stone mortar 32 is supported so that the pressure contact force of the compression coil spring 39a is applied via the rotating ball 39b of the elastic support means 39, so that the rotation is not hindered.

  Further, the elastic support means 39 may have a vertically movable means 39d in order to vary the pressure in the vertical direction. The movable means 39d may be, for example, a stator having a screw groove that is screwed into a screw thread provided on the outer surface of the cylindrical body 39c, or a ring-shaped ring that can move up and down and supports a plurality of elastic support means 39. A single plate may be used. If the elastic support means 39 has a movable means 39d for changing the pressure in the vertical direction and the contact pressure of the elastic support means 39 can be changed, a more appropriate contact pressure suitable for the type of grain is set. As a result, a good degree of grinding can be obtained.

  As described above, the lower millstone 32 has a plurality of elastic support means 39 for urging the lower millstone 32 in the direction of the upper millstone 31, so that it is forcibly pressed against the upper millstone 31 with an appropriate pressure while rotating. The pressing force is dispersed by the plurality of elastic support means 39, and a uniform and tight pressing force can be applied to the lower surface of the lower stone mortar 32. Further, since the upper stone mill 31 is supported by these elastic support means 39 so as to be in contact with the lower stone mill 32 to which a uniform pressure contact force is applied, powder milled to a desired particle size is obtained. Further, since the lower millstone 32 is forcibly pressed against the upper millstone 31, it is possible to apply a weight more than the weight of the upper millstone 31, so the weight of the upper and lower mills can be reduced and the weight can be reduced. The grinder 1 can be reduced in size and weight.

  Regardless of the embodiments described above, the present invention can be used for milling of not only rice but also grains such as wheat, soybeans, corn, dried mushrooms, boiled, eggshell, dried shrimp, tea leaves, Chinese herbal medicine raw materials and the like.

  In addition, the present invention is not limited to the above embodiment, and the structure and form of the hopper part, the grinding mill part, the drive part, the discharge part, and the machine base part can be appropriately changed and employed.

FIG. 1 is a front cross-sectional view showing a configuration of a grinding machine according to a first embodiment. FIG. 2 is an explanatory diagram of the speed reduction means in the first embodiment. FIG. 3 is a front sectional view showing a configuration of a grinding machine according to the second embodiment. FIG. 4 is a longitudinal sectional view showing a main part of an example of a conventional grinder. FIG. 5 is a longitudinal sectional view showing a main part of another example of a conventional grinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grinding machine 2 Hopper part 3 Grinding mill part 4 Drive part 5 Discharge part 6 Machine base part 7 Dough 21 for rough grinding Introduction cylinder 21a Upper opening 21b Cover member 21c Introduction port 30 Bearing 30a Main shaft 30b Second shaft 30c Three shafts 31 Upper stone mill 32 Lower stone mill 33 Distance adjustment mechanism 34 Upper support base 38 Lower support base 39 Elastic support means 39a Compression coil spring 39b Metal ball 39c Cylindrical body 39d Movable means 41 Rotating motor 42 Rotating shaft 43 Deceleration means 74 Fixed Coarse grinding blade 75 Rotating coarse grinding blade

Claims (9)

An upper mill and a lower mill whose bottom surface and upper surface are in sliding contact with each other are arranged coaxially, the upper mill is fixed so as not to rotate, and the lower mill is supported rotatably by a driving source via a speed reduction means. In an electric grinder equipped with a grinding mill
The electric mill is provided with means for adjusting the distance between the upper millstone and the lower millstone, and elastic support means for elastically applying upward pressure to a plurality of locations other than the central portion of the lower surface of the lower millstone. Electric grinder characterized by comprising.   2. The electric grinding machine according to claim 1, wherein a coarse grinding die is provided between the upper stone die and the hopper, and the coarse grinding die is driven coaxially with the lower stone die.   The electric grinding machine according to claim 1 or 2, wherein the rotation speed of the lower stone mill is set to 50 RPM to 70 RPM.   The elastic support means is characterized in that a compression coil spring and a ball rotatably supported by the compression coil spring are wrapped in a cylinder, and a part of the ball is exposed from the cylinder. The electric powder grinder according to any one of claims 1 to 3.   5. The electric motor according to claim 1, wherein the means for adjusting the distance between the upper stone mill and the lower stone mill includes a means for changing a pressing force in a vertical direction of the elastic support means. Grinding machine.   The electric milling machine according to any one of claims 1 to 5, wherein the upper and lower milling surfaces are both horizontal surfaces.   The electric grinding machine according to any one of claims 1 to 6, wherein the elastic support means supports the lower stone mill at at least three locations.   The electric grinder according to claim 2, wherein the coarse grinding mill part and the grinding mill part are made into a block, can be removed, and can be disassembled. It is possible to pulverize into powder having a particle size of approximately 750 to 180 μm by the coarse grinding mill, and so that the powder having a particle diameter of approximately 180 to 60 μm occupies 80% or more by the grinding mill. The electric grinder according to claim 2, characterized in that

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