JP7326532B2 - Mill blade manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a disc-shaped mill blade having a blade portion on one side.

Conventionally, in this type of mill blade, the swivel mortar, which is a rotary blade, and the fixed mortar, which is a fixed blade, have a groove as an introduction recess extending radially from the inner peripheral end. It forms a slope that gradually becomes shallower from the inner peripheral side to the outer peripheral side, and reaches the surface of the swivel mortar in the middle. , in which the direction in which the rows of concavities and convexities are arranged changes every certain range in the circumferential direction (for example, Patent Document 1).

In the above-described mill blade, the roasted beans pushed into the central space of the fixed mortar are further pushed between the recessed grooves of the fixed mortar and the swivel mortar and sheared, and then cut between the swivel mortar and the fixed mortar. After it is sufficiently finely ground, it spills out from the outer peripheral end of the grinding mill.

Japanese Patent No. 4523434

However, in order to form a large number of fine grooves in a disk-shaped mortar made of carbon steel, the above-described mill blade requires cutting to form the grooves, which raises the cost of the mortar. In addition, as described above, since the entire mill blade is made of carbon steel, it was common to sweep the mill blade with a brush or the like in order to clean the mill blade on which fine powder and oil of the material to be pulverized adhered. . Although it is possible to clean the mill blades by washing with water using a detergent, it is difficult to reliably wipe off the water in the grooves and the like, and there is a risk of rusting.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a method for manufacturing mill blades that can be manufactured easily and inexpensively.

In the method for manufacturing a mill blade according to claim 1 of the present invention, a disk-shaped base made of a synthetic resin or a rust-proof metal is integrated with one side of the base , and the hardness is higher than that of the base. and a disk-shaped cutting edge made of a metal having a high rust resistance , wherein a plurality of grooves that become narrower and shallower toward the outer circumference are formed in the base, and the cutting edge is formed. Then, a groove opening corresponding to the groove is formed, and a metal plate having a constant thickness is punched from the upper surface side by press working to form the blade having the groove opening. By flattening the lower surface of the metal plate having burrs generated on the edge of the metal plate, the edge of the groove opening is formed into a sharp cutter blade.

According to claim 2 of the present invention, there is provided a mill blade manufacturing method according to claim 1, wherein the base is formed of synthetic resin by molding.

In the method for manufacturing a mill blade according to claim 1 of the present invention, as described above, the cutter blade of the blade portion is formed at the edge of the groove opening by simple deburring after press working. mill blades can be manufactured easily and inexpensively.

By forming the base from a synthetic resin by molding, the base can be manufactured easily and inexpensively.

1 is a perspective view of a coffee maker with an electric mill as a mill device showing Embodiment 1 of the present invention, with a mill portion removed; FIG. It is a perspective view of a drive unit same as the above. It is a whole perspective view same as the above. It is a whole explanatory drawing same as the above. Fig. 3 is an exploded perspective view of the same as the above, around the rotary blade mounting portion; Fig. 3 is an exploded perspective view of the same as the above, around the fixed blade mounting portion; Fig. 3 is an exploded perspective view of the mill case of the mill unit; It is a longitudinal cross-sectional view of the front-back direction of a mill part same as the above. Fig. 3 is a cross-sectional plan view of the mill portion of the same; Fig. 3 is a longitudinal cross-sectional view of the same mill part in the left-right direction; It is an exploded perspective view of a drive unit same as the above. Fig. 3 is an exploded perspective view of the mill part with fixed blades exposed; Fig. 3 is an exploded perspective view of the mill portion with rotary blades exposed; FIG. 4 is an explanatory diagram illustrating meshing between a drive gear and a driven gear; It is an exploded perspective view of a rotary blade and a fixed blade same as the above. It is a perspective view of a rotary blade and a fixed blade same as the above. It is a top view of a rotary blade and a fixed blade same as the above. Fig. 3 is a cross-sectional view of main parts of the rotary blade and the fixed blade; It is a perspective view of the back side of a rotary blade and a fixed blade same as the above. It is an exploded perspective view of a rotary blade and a fixed blade showing Example 2 of the present invention. It is a perspective view of a rotary blade and a fixed blade same as the above. FIG. 10 is a perspective view of the electric mill as the milling device showing Embodiment 3 of the present invention, with the mill portion removed.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the embodiments described below do not limit the content of the present invention described in the claims. Moreover, not all the configurations described below are essential requirements of the present invention.

Embodiment 1 of the present invention will be described below with reference to FIGS. 1 to 19. FIG. 1 is a coffee maker with an electric mill as a milling device, and a case body 2 as a main body of the coffee maker 1 is integrally formed with a rear erected portion 3 and a lower portion of the erected portion 3. It has a front mounting portion 4 and a canopy portion 5 integrally formed with the upper portion of the standing portion 3 . A water storage portion 6 is provided in the standing portion 3, and external water can be supplied to the water storage portion 6. In this example, the water storage portion 6 is detachable from the case body 2. , and the water reservoir 6 contains a water reservoir (not shown).

As shown in FIG. 4, a heating means 7 is provided in the water reservoir 6 for heating the water in the water reservoir. Further, the case main body 2 is provided with hot water supply means 9 for feeding hot water obtained by heating with the heating means 7 to the dripper 8 . A pump or the like is exemplified as the hot water supply means 9 .

The mounting portion 4 has an upper opening, and a substantially planar heating plate 11 is provided so as to block the opening. A heater 12 is provided in thermal contact with the lower surface of the heating plate 11 .

A beverage server 13 is detachably mounted on the heating plate 11 . The beverage server 13 includes a container body 14 made of heat-resistant glass with an upper opening, a grip part 15 made of synthetic resin attached to the side plate of the container body 14, and a synthetic resin material covering the upper opening of the container body 14. and a lid body 16 of.

On the side portion of the standing portion 3, above the beverage server 13 of the mounting portion 4, the mill portion 17, the hot water supply portion 18, and the dripper 8 as the extraction portion are arranged from above.

The mill device 20 includes the mill portion 17 provided on the upper portion of the case body 2 for crushing and discharging coffee beans, which are the raw materials of the beverage, and an electric motor 21 provided on the case body 2 for operating the mill portion 17. have. In addition, in the case main body 2 and the milling device 20, the front side is one side in the front-rear direction, and the rear side is the other side in the front-rear direction.

The mill portion 17 is detachably attached to the mounting recess 19 of the case body 2 . 12 and 13, the mill section 17 includes a rotary blade mounting portion 23 having a disk-shaped rotary blade 22, a fixed blade mounting portion 25 having a disk-shaped fixed blade 24, configured to be decomposable into The rotary blade 22 and fixed blade 24 are disk-shaped as a whole.

As shown in FIG. 5 and the like, the rotary blade mounting portion 23 includes, from the front side, the rotary blade 22, a rotary holder 31 for mounting the rotary blade 22, a cover member 32, and a driven gear 33 as a driven-side transmission mechanism. Prepare. The rotary holder 31 integrally includes a disk-shaped mounting plate 34 for mounting the rotary blade 22 and a mill screw 35 projecting forward from the center of the mounting plate 34. A through hole 36 is drilled. A pair of projecting portions 37, 37 that sandwich the rotary blade 22 are provided around the front surface of the mounting plate 34 so as to protrude forward.

A blade portion 151 is provided on the front surface of the rotary blade 22 , and a through hole 152 is formed in the center of the rotary blade 22 . A plurality of through holes 34A are formed in the mounting plate 34, and as shown in FIG. The rotary blade 22 is attached to the attachment plate 34 by screwing it into the hole 186A. The screws 38 are screw-type fixing means. The screw 38 is made of a rust-proof metal (stainless steel in this example).

The cover member 32 is provided with a through hole 42 in the center of the disc portion 41, and a mounting cylinder portion 43 having a central hole larger than the diameter of the through hole 42 is protruded from the front surface of the disc portion 41, and the mounting A bearing member 44 is fixed inside the cylindrical portion 43 . An outer cylindrical portion 45 is provided integrally around the disk portion 41, and this outer cylindrical portion 45 is projected forward. In addition, a plurality of non-slip concave portions 45B are provided on the outer circumference of the outer cylindrical portion 45 to form a non-slip portion.

A hub portion 46 at the center of the driven gear 33 is formed with a through hole 47, and the inner peripheral surface of the through hole 47 is formed with a flat portion (not shown) serving as a rotary shaft engaging portion. A rotating shaft 48 made of a metal rod or the like is fixed to the through hole 36 of the mill screw 35 by insert molding or the like. The rotating shaft 48 has its rear end rotatably inserted through the bearing member 44 and its rear end inserted through the through hole 47 of the driven gear 33 in a non-rotating state. The driven gear 33 is fixed to the rotating shaft 48 by screwing a screw 49 onto the rear end of the rotating shaft 48 .

As a result, the mounting plate 34 integrally provided with the mill screw 35 and the driven gear 33 are rotatably provided with respect to the cover member 32, and the mounting plate 34 integrally provided with the mill screw 35 is provided. , the driven gear 33 and the rotating shaft 48 constitute a driven side transmission structure 50 .

The fixed blade attachment portion 25 includes a mill case 51, an upper case 52 attached to the upper portion of the mill case 51, and a lower case 53 attached to the lower portion of the mill case 51, as shown in FIG.

The mill case 51 has a cylindrical storage tube portion 55 for storing the rotary blade 22 and the fixed blade 24. A front wall portion 56 is provided at the front end of the storage tube portion 55. A through hole 56A is formed, and a guide tube portion 57 is protruded behind the through hole 56A. A small diameter portion 55B having a smaller diameter than the other parts is formed on the front side of the storage cylinder portion 55 corresponding to the position of the guide cylinder portion 57. As shown in FIG. The blade portion 151 is provided on the rear surface, which is one side of the fixed blade 24 , and the through hole 152 is formed in the center of the fixed blade 24 . The guide tube portion 57 is inserted into the through hole 152 of the fixed blade 24, and a portion of the fixed blade 24 in the thickness direction is accommodated between the guide tube portion 57 and the small diameter portion 55B.

Further, the fixed blade mounting portion 25 has a guide wall portion 58 having a substantially U-shaped cross section on the front side of the through hole 56A. A vertical wall portion 59 is provided at the front end of the guide wall portion 58 to block the front side of the guide wall portion 58. The vertical wall portion 59 is provided with a through hole 59A. A large mounting cylinder portion 60 projects forward from the vertical wall portion 59 .

A bearing member 61 is fixed in the mounting cylinder portion 60, and the front end of the rotary shaft 48 is detachably inserted into the bearing member 61 from the rear side. Further, the rear portion of the storage cylinder portion 55 is opened, and a male screw portion 55A is formed on the outer periphery of the storage cylinder portion 55, and the female screw portion 45A of the cover member 32 is attached to the male screw portion 55A of the storage cylinder portion 55. Removably threaded.

Then, the distal end side of the rotating shaft 48 is inserted through the through hole 56A of the housing cylinder portion 55 and the through hole 59A of the guide cylinder portion 57 from the rear side, and the male screw portion 55A of the housing cylinder portion 55 is engaged with the cover. By screwing the female threaded portion 45A of the member 32 and inserting the tip of the rotary shaft 48 into the bearing member 61, the mounting plate 34 of the rotary holder 31 and the rotary blade 22 are installed in the housing cylinder portion 55. , the rotary blade mounting portion 23 is mounted to the fixed blade mounting portion 25, and the rotary holder 31 is rotatably mounted in the mill portion 17. As shown in FIG.

Further, a cylindrical drop port 62 is provided at the lower portion of the storage cylinder portion 55 so as to protrude downward. The drop port 62 has a cylindrical shape and communicates with the bottom portion inside the housing cylinder portion 55 . The coffee beans are ground between the rotating blade 22 and the fixed blade 24 to become coffee powder (ground beans), and the coffee powder in the storage tube portion 55 is discharged from the drop port 62 to the center of the dripper 8. to be fed drop-in.

As shown in FIG. 9 and the like, the mill section 17 is provided with a particle size adjusting means 65 for adjusting the degree of pulverization (particle size) of the coffee powder. The particle size adjusting means 65 adjusts the degree of pulverization of coffee powder by adjusting the distance between the front surface of the rotary blade 22 and the rear surface of the fixed blade 24 .

The granularity adjusting means 65 will be specifically described. A fixed blade holder 66 is provided on the fixed blade mounting portion 25 so that the position thereof can be adjusted forward and backward. As shown in FIG. 6 and the like, the fixed blade holder 66 has a cylindrical front tubular portion 67 arranged outside the mounting tubular portion 60. At the front end of the front tubular portion 67 is an inner collar portion. 67A are provided around. Further, side wall portions 68 , 68 are provided on the rear left and right sides of the front tubular portion 67 . These left and right side wall portions 68 , 68 are arranged along the outer peripheral surface of the guide wall portion 58 . Mounting portions 69, 69 are provided at the rear ends of the side wall portions 68, 68, respectively. The front surface of the fixed blade 24 is fixed to the rear surfaces of the portions 69,69.

As shown in FIG. 7, the right and left sides of the front wall portion 56 of the mill case 51 are provided with the insertion openings 63, 63 into which the left and right mounting portions 69, 69 are loosely inserted. Through holes 69A, 69A are formed in the left and right mounting portions 69, 69, respectively. Then, as shown in FIG. 9, by screwing a screw 70 inserted through the through hole 69A into a lower hole 186A of a mounting boss 186 on the front surface of the fixed blade 24, the left and right mounting portions 69, 69 are connected to each other. The fixed blade 24 is fixed. The screws 70 are made of rust-proof metal (stainless steel in this example). A coil spring 71 serving as biasing means is mounted on the mounting cylinder portion 60 between the inner flange portion 67A of the fixed blade holder 66 and the vertical wall portion 59 of the mill case 51. As shown in FIG. The coil spring 71 urges the mill case 51 to move the fixed blade holder 66 forward.

The granularity adjusting means 65 has a rotary dial 72 which is an operation part. This dial 72 is fixed in front of the front plate portion 74 of the pressing body 73 . The pressing body 73 is integrally provided with a pressing tube portion 75 at the rear portion of the front plate portion 74, and the pressing tube portion 75 is formed with a female screw portion 75A. A male screw portion 60A is provided on the mounting cylinder portion 60, and the female screw portion 75A is screwed into the male screw portion 60A. By this screwing, the pressing body 73 is provided so as to move forward and backward with respect to the mill case 51 .

When the pressing body 73 is turned in the screwing-in direction by the dial 72, the pressing cylinder portion 75 is retracted, and the fixed blade holder 66 is pushed by the rear end 75B of the pressing cylinder portion 75. , the coil spring 71 is compressed. As a result, the distance between the fixed blade 24 and the rotary blade 22 is narrowed. On the other hand, when the dial 72 is turned in the opposite direction, the fixed blade holder 66 advances due to the elastic restoring force of the coil spring 71 . As a result, the space between the fixed blade 24 and the rotary blade 22 is increased.

6 and 9, the granularity adjusting means 65 comprises a click means 77 for defining the rotation angle of the dial 72. As shown in FIGS. This click means 77 has a cylinder 78 . A flange portion 78A is provided around the front outer periphery of the tubular body 78 . The tubular body 78 is inserted into the front tubular portion 67 of the fixed blade holder 66 , and the flange portion 78 A contacts the front edge of the mounting tubular portion 60 . At this time, the convex portion 60B provided on the front edge of the mounting cylinder portion 60 engages with the notch portion 78B formed in the flange portion 78A, so that the cylinder body 78 is moved relative to the mounting cylinder portion 60. It is in a non-rotating state. Further, a mounting tubular portion 79 is integrally protruded on the front side of the tubular body 78 at a position off the center of the tubular body 78 . A click rod 80 is inserted into the mounting cylinder portion 79 so as to be slidable back and forth. The click rod 80 is urged forward by the coil spring 81 .

Further, the front plate portion 74 of the pressing body 73 is formed with a plurality of click recesses 83, 83 . . . These click recesses 83, 83, . Then, as shown in FIG. 9, the tip 80S of the click rod 80 is formed into a convex curved surface. The click recess 83 is formed in a stepped hole, and the tip 80S engages with a large diameter portion 83A of the stepped hole.

Therefore, when the dial 72 is turned while the tip 80S of the click rod 80 is engaged with the click recess 83, the coil spring 81 is contracted, and the tip of the click rod 80 moves from the click recess 83 to the tip of the click rod 80. When the tip 80S is disengaged and the tip 80S engages with the adjacent click recess 83, the elastic restoring force causes the coil spring 81 to expand and a predetermined click feeling is obtained. The distance between the fixed blade 24 and the rotary blade 22 can be adjusted according to the number of clicks. For this reason, the dial 72 may be provided with a scale indicating the degree of pulverization corresponding to the click recess 83 .

As shown in FIG. 7, the upper case 52 has a hopper 86 having a planar circular upper opening 85 . This hopper 86 forms part of the upper case 52 . Further, lower openings 87, 87 are provided on the left and right sides of the bottom portion 86A of the hopper 86. As shown in FIG. A chute portion 88 is provided under these lower openings 87, 87, and the lower portion of the chute portion 88 communicates with the upper opening of the guide wall portion 58 (FIG. 6). A lid body 89 is detachably provided in the upper opening 85 of the upper case 52 .

An upper front cover portion 91 is integrally provided on the front side of the hopper 86 . As shown in FIG. 8 and the like, the upper front cover portion 91 constitutes a part of the upper case 52 and covers the front upper portion of the mill case 51 . A front surface portion 92 of the upper front cover portion 91 is formed with an insertion hole 93 through which the pressing cylinder portion 75 is inserted.

The lower case 53 integrally has a lower case main body 95 covering the periphery of the lower portion of the mill case 51 and a U-shaped lower front cover portion 96 covering the front lower portion of the mill case 51 . A front edge portion 96A of the lower front cover portion 96 contacts the rear surface of the front surface portion 92 of the upper front cover portion 91 (FIG. 8). Also, the lower case 53 is fixed to the upper case 52 while covering the rear lower portion of the mill case 51 . Further, a notch portion 97 is formed in the lower case main body 95, and the drop port 62 protrudes downward from the notch portion 97. As shown in FIG.

The mill section 17 is provided with an attachment/detachment operation section 101 . As shown in FIGS. 7 and 10 , the attachment/detachment operation portion 101 is provided with sliders 103 , 103 movably in the left-right direction in slide recesses 102 , 102 formed on the left and right outer surfaces of the hopper 86 . Configured. These sliders 103, 103 are each provided with an engaging claw portion 105 wider than the slide plate 104 on the outside of the slide plate 104 formed in the horizontal direction, and the outer edge portion 105A of the engaging claw portion 105 is inclined. formed in A plate-shaped vertical portion 106 is provided on the upper portion of the locking claw portion 105 . A horizontal knob 107 protrudes outward from the upper portion of the vertical portion 106 . A coil spring 108 as a biasing means is arranged between the vertical portion 106 and the bottom surface of the slide recess 102, and the coil spring 108 biases the slider 103 outward. Abutting edge portions 106A, 106A are protrudingly provided on both front and rear side edges of the vertical portion 106, and retaining edge portions 102A, 102A with which the abutting edge portions 106A, 106A abut are formed on both front and rear sides of the slide recess 102. formed inwardly at the outer ends of the longitudinal edges of the That is, the outward movement range of the slider 103 is restricted to a position where the contact edge portion 106A contacts the retaining edge portion 102A. In FIG. 10, the solid line indicates the state in which the slider 103 is retracted, and the chain line indicates the state before the knob 107 is pushed. The attachment/detachment operation portion 101 has the locking claw portion 105 locked to a locking hole portion 119 to be described later in a state in which the slider 103 is at the position indicated by the dashed line.

Arms 111, 111 project outward from the upper left and right sides of the cylindrical storage portion 55 of the mill case 51, and slide grooves 112, in which the slide plate 104 slides, are formed on the upper surfaces of these arms 111, 111, respectively. It is formed. Outer flanges 113, 113 are provided on the left and right sides of the upper edge of the lower case body 95 corresponding to the arms 111, 111, respectively. The arm portions 111, 111 are placed on the left and right outer flange portions 113, 113 in a fitted state. In this state, a screw 115 (FIG. 7) is inserted through the through hole 114 of the outer collar portion 113, and the screw 115 is fixed to the upper case 52, whereby the upper and lower cases 52 and 53 are integrated. be.

The mounting recess 19 includes a substantially U-shaped front recess 116 that opens to the front and top surfaces of the case body 2 , and a circular rear recess 116 that is located behind the front recess 116 and opens to the top surface of the case body 2 . It has a recess 117 . The front sides of the upper case 52 and the lower case 53 are accommodated in the front concave portion 116 , and the front surface portion 92 is substantially flush with the front surface of the eaves portion 5 in the accommodated state. On the other hand, the rear sides of the upper case 52 and the lower case 53 are accommodated in the rear concave portion 117, and in the accommodated state, the upper surface of the upper front cover portion 91 is substantially flush with the upper surface of the eaves portion 5, An upper opening 85 of the upper case 52 protrudes from the upper surface of the eaves portion 5 .

Left and right operating recesses 118 , 118 are formed on the left and right sides of the rear recess 117 so as to correspond to the left and right sliders 103 , 103 . Left and right side portions are vertically provided below the bottom portions 118A, 118A of the left and right operating recesses 118, 118, and the above-described locking claw portions 105, 105 as locking portions are provided above the left and right side portions. The locking holes 119, 119 are formed as slit-like locking receiving portions that can be locked.

Accordingly, when the mill portion 17 is inserted into the mounting recess 19 from above, the outer edge portion 105A of the locking claw portion 105 contacts the corner portion of the bottom surface portion 118A above the locking hole portion 119 . When the mill portion 17 is pushed downward from here, the slider 103 retreats and the coil spring 108 contracts due to the inclination of the outer edge portion 105A. As a result, the locking claw portion 105 passes through the corner. After the engaging claw portion 105 passes through the corner, the coil spring 108 is extended, and the engaging claw portion 105 is engaged with the engaging hole portion 119 . As a result, the mill portion 17 is fixed to the mounting recess 19 .

Conversely, when the left and right knob portions 107, 107 are pushed inward, the locking claw portion 105 is pulled out from the locking hole portion 119, and the mill portion 17 can be removed from the mounting recess portion 19. As shown in FIG.

A drive unit 121 is provided in the case body 2 . The drive unit 121 has a drive gear 122 meshing with the driven gear 33 . As shown in FIGS. 2 and 11 , the drive unit 121 has a front holder 123 and a rear holder 124 . The front holder 123 and the rear holder 124 are assembled integrally. Also, the electric motor 21 is attached to the rear holder 124 . A motor-side gear 126 is provided on the rotating shaft of the electric motor 21 . The front holder 123 has a front storage portion 127 and the rear holder 124 has a rear storage portion 128 . A reduction gear group 129 is arranged inside the front and rear storage portions 127 and 128 .

The reduction gear group 129 has a first rotary plate 130 and a second rotary plate 130A. Four shafts 131 , 131 , 131 , 131 are projected from the rear part of the first rotary plate 130 , and reduction gears 132 , 132 , 132 , 132 are attached to these shafts 131 , 131 , 131 , 131 . is rotatably provided. The motor-side gear 126 meshes with the reduction gears 132, 132, 132, 132 at the centers of the reduction gears 132, 132, 132, 132, respectively. On the other hand, the outer peripheral sides of these reduction gears 132 , 132 , 132 , 132 mesh with an internal gear (not shown) formed on the inner surface of the front housing portion 127 . A transmission gear 133 is integrally provided at the center of the front side of the first rotary plate 130 . In front of the first rotating plate 130, the second rotating plate 130A is arranged. Four shafts 131A, 131A, 131A, 131A are projected from the rear portion of the second rotary plate 130A, and reduction gears 132A, 132A, 132A, 132A are attached to these shafts 131A, 131A, 131A, 131A. is rotatably provided. At the center of these reduction gears 132A, 132A, 132A, 132A, the transmission gear 133 meshes with each reduction gear 132A, 132A, 132A, 132A. On the other hand, the outer peripheral sides of these reduction gears 132A, 132A, 132A, 132A mesh with an internal gear (not shown) formed on the inner surface of the front storage portion 127. As shown in FIG. Further, the drive gear 122 is integrally provided at the center of the front side of the second rotary plate 130A. A gear holder 134 adjacent to the rear end of the shaft portion 131 is provided on the rear side of the first rotating plate 130 . Also, the rear end of the shaft portion 131 of the second rotating plate 130A is close to the front surface of the first rotating plate 130A. The gear holder 134 has a disk-shaped front surface portion 134A to which the rear end of the shaft portion 131 is adjacent, and a cylindrical portion 134B integrally provided at the rear portion of the front surface portion 134A. A central through-hole 134C is formed through the central portion of the front surface portion 134A. The motor-side gear 126 is inserted through the center through-hole 134C, and meshes with the reduction gears 132, 132, 132, 132 on the front side of the front surface portion 134A. The distance from the shaft portion 131 of the first rotating plate 130 to the front surface portion 134A of the gear holder 134 is shorter than the length of the reduction gear 132 in the axial direction. Similarly, the distance from the shaft portion 131A of the second rotary plate 130A to the front surface of the first rotary plate 130 is also shorter than the axial length of the reduction gear 132A. The motor-side gear 126, the reduction gear 132, and an internal gear (not shown) constitute a reduction mechanism based on a planetary gear mechanism. At this portion, the motor-side gear 126 serves as a sun gear, and the reduction gear 132 serves as a planetary gear. Similarly, the transmission gear 133, the reduction gear 132A, and an internal gear (not shown) constitute a reduction mechanism based on a planetary gear mechanism. At this portion, the transmission gear 133 is the sun gear, and the reduction gear 132A is the planetary gear.

A front part 135 is integrally provided on the front side of the front storage part 127 of the front holder 123 . The front surface of the front surface portion 135 is provided with a cutout cylinder portion 137 having a side opening portion 136 on the right side, which is one of the left and right sides. A vertical concave portion 138 having a substantially U shape in a front view is provided on the right side of the notched cylindrical portion 137 .

The drive unit 121 is fixed in the case body 2 in a state in which the drive gear 122 is inserted from the rear side into the cutout cylindrical portion 137 , and the side portion of the drive gear 122 is opened from the side opening 136 . is exposed on the front side of the front face portion 135 of the front holder 123 . Further, the rear end of the hub portion 46 of the driven gear 33 is loosely inserted into the vertical recess 138 through an upper opening 138A.

Both the driving gear 122 and the driven gear 33 are spur gears, and the axial directions of their respective rotation center shafts 122J and 33J are horizontal and parallel. When the mill portion 17 is attached to the case body 2, the rotation center axes 122J and 33J of the drive gear 122 and the driven gear 33 are horizontally offset. Moreover, it is desirable that the rotation center shafts 122J and 33J are arranged at the same height. In this embodiment, as shown in FIG. In this example, the rotation center axis 33J of the driven gear 33 is the center axis of the rotation shaft 48. As shown in FIG.

As a result, as described above, when the mill portion 17 is attached to the mounting recess 19 of the case body 2, the driven gear 33 is engaged with the driving gear 122 while rotating. can be reliably engaged. Further, as shown in FIG. 14, the drive gear 122 rotates clockwise so that the side that meshes with the driven gear 33 moves downward. As a result, a force acts to press the driven gear 33 and thus the mill portion 17 downward when a load is applied. That is, a force acts in a direction opposite to the direction in which the mill portion 17 is removed from the case body 2 .

As shown in FIG. 4, in the center of the case 141 of the hot water supply portion 18, an insertion hole 142 into which the drop port 62 is detachably inserted and connected is vertically provided. By attaching the mill portion 17 to the attachment recess 19 , the drop port 62 is connected to the insertion hole 142 . A shutter 143 for opening and closing the insertion hole 142 is provided below the insertion hole 142 .

A connection portion 144 is provided in the case 141, and hot water is sent to the connection portion 144 from the hot water supply means 9 through the liquid supply path 9A. The case 141 is provided with a plurality of nozzles 145 for supplying hot water to the dripper 8 . Also, a paper filter 146 is replaceably arranged in the dripper 8 . Furthermore, a stop valve 147 is provided at the bottom of the dripper 8 . A switch 10 is operated when using the coffee maker 1 as a mill.

The configurations of the rotary blade 22 and the fixed blade 24 of the present invention will be described below. Note that the rotary blade 22 and the fixed blade 24 have the same configuration except for the mounting position and the presence or absence of rotation.

As shown in FIGS. 15 to 19, the rotary blade 22 and the fixed blade 24 are provided integrally with a disc body 150 serving as a disc-shaped base and on one side of the disc body 150 and are thinner than the disc body 150. and the disk-shaped blade portion 151 . The disk body 150 has the circular through hole 152 in the center. Four grooves 153 , 153 , 153 , 153 are rotationally symmetrically provided on one side of the disc body 150 . These grooves 153 , 153 , 153 , 153 are formed so as to be delayed in the direction of relative rotation toward the outer circumference. The blade portion 151 is made of a metal plate 151A made of a plate material having a constant thickness, and is shaped like a disc having the same diameter as the disc body 150 . Both sides of the blade portion 151 are flat. Further, the blade portion 151 is provided with a central through hole 152H and four groove openings 155, 155, 155, 155 formed in an arc shape outwardly from the through hole 152H. These through holes 152H and the groove openings 155, 155, 155, 155 constitute holes. The blade portion 151 is formed in a disc shape by punching out a metal plate as a base material with a press or the like, and the through hole 152H and four groove openings 155, 155, 155, 155 are formed. The through hole 152H corresponds to the through hole 152. As shown in FIG. Also, the groove openings 155 , 155 , 155 , 155 correspond to the grooves 153 , 153 , 153 , 153 . That is, the through hole 152H has substantially the same diameter as the through hole 152H. Further, the groove opening 155 has the same shape as the groove 153 on one side surface of the disk body 150 . The blade portion 151 is made of metal such as stainless steel, titanium, etc., which has higher hardness than the disc body 150 and has antirust properties. In this example, stainless steel is adopted. On the other hand, the disc body 150 is made of a synthetic resin such as engineering plastic, or a rust-proof metal such as an aluminum alloy. That is, the disk body 150 can be manufactured easily and inexpensively by molding such as injection molding and die casting. In addition, in this example, an engineering plastic such as POM or PBT having oil resistance is adopted.

In FIG. 17 , the direction indicated by the white arrow is the direction of rotation of the rotary blade 22 . Each of the groove openings 155, 155, 155, 155 has a front curved edge 156 on the front side in the rotational direction and a cutter blade 157 formed by the rear curved edge on the rear side in the rotational direction. have. The front curved edge 156 and the cutter blade 157 are edges formed on the blade portion 151 . Then, in the assembled state, the front side curved edge portion 156 and the cutter blade 157 are provided along the groove portion 153 of the disc body 150 .

Further, when viewed from the front, each of the front curved edge portions 156 and the cutter blade 157 is curved so that the front side in the rotational direction is convex. That is, the groove openings 155 , 155 , 155 , 155 curve rearward in the rotational direction from the arc inner edge 170 of the through hole 152 on the inner end side toward the intersection point 158 on the outer end side. The front curved edge portion 156 and the cutter blade 157 are both arc-shaped, and the radius of curvature of the cutter blade 157 is slightly smaller than that of the front curved edge portion 156 . The outer end of the front curved edge portion 156 and the outer end of the cutter blade 157 intersect at the intersection point 158 near the outer periphery of the disc body 150 . Also, the inner end of the cutter blade 157 intersects the arc inner edge portion 170 at the inner intersection portion 159 . On the other hand, the inner end of the front curved edge 156 intersects the arc inner edge 170 at an inner intersection 159A.

A connection portion 165 is provided between the intersection portion 158 and the outer peripheral surface 151</b>G of the blade portion 151 . That is, the outer end of the front curved edge portion 156 and the outer end of the cutter blade 157 do not reach the outer peripheral surface 151G. Thus, by providing the connecting portion 165 to the blade portion 151, the connecting portions 165 are in contact with each other even if the rotary blade 22 is inclined relative to the fixed blade 24 when crushing the beverage ingredients. It will be. Therefore, the cutter blade 157 of the rotary blade 22 and the cutter blade 157 of the fixed blade 24 are prevented from coming into contact with each other and being damaged.

On one side surface of the disc body 150, the groove portion 153 is formed with a front curved edge portion 156K and a rear curved edge portion 157K having the same shape as the front curved edge portion 156 and the cutter blade 157, respectively. be. That is, the grooves 153, 153, 153, 153 are curved rearward in the rotational direction from the arc inner surface portion 170K of the through hole 152 on the inner end side toward the intersection portion 158K on the outer end side. Further, the outer ends of the front curved edge portion 156K and the rear curved edge portion 157K are connected at an intersection portion 158K.

A bottom portion 160 that is the lowest portion of the groove portion 153 is one side edge of the through hole 152 . The groove portion 153 includes a front groove inner surface portion 161 formed in the depth direction from the front curved edge portion 156K and a rear groove inner surface portion 162 formed in the depth direction from the rear curved edge portion 157K. have. The front groove inner surface portion 161 and the rear groove inner surface portion 162 intersect at a bottom edge portion 163 on the bottom side. The bottom edge portion 163 is formed from the rotation direction rear end 160A of the bottom portion 160 to the intersection portion 158K. The bottom edge portion 163 has a curved shape in plan view. Also, the bottom edge portion 163 is formed to be inclined from the rear end 160A of the bottom portion 160 toward the intersection portion 158K. It should be noted that the plane view in this case is the case of seeing as in FIG. 17 .

Further, the rear groove inner surface portion 162 is formed to stand substantially vertically. That is, the rear groove inner surface portion 162 has the same curved shape as the cutter blade 157 in plan view. The bottom edge portion 163 is positioned at the lower end of the rear groove inner surface portion 162 . On the other hand, the front groove inner surface portion 161 is formed by a concave curved surface. The rear end of the front groove inner surface portion 161 in the rotational direction is the bottom edge portion 163 , and the inner end of the front groove inner surface portion 161 is the bottom portion 160 .

As shown in FIG. 15 and the like, the front groove inner surface portions 161 of the groove portions 153, 153, 153, 153 extend from the bottom edge portion 163 to the front curved edge portion 156K in the rotational direction (circumferential direction) of the disc body 150. As shown in FIG. slopes upwards towards At the front curved edge portion 156K, the front groove inner surface portion 161 is at the same height as the flat portion 164 on the one surface side of the disk body 150. As shown in FIG. The groove portion 153 and the groove opening portion 155 are formed so that the width thereof becomes narrower from the central side to the outer peripheral side. Further, the groove portion 153 is formed so as to become shallower from the central side to the outer peripheral side.

Further, it is desirable that the rear groove inner surface portion 162 is vertical, but as the draft angle of the mold, the upper portion of the rear groove inner surface portion 162 is slightly inclined toward the rear side in the rotational direction. Also good. The inclination angle of the rear groove inner surface portion 162 is less than 1 degree, and 0.5 degrees in this example, with respect to the vertical. The height of the rear groove inner surface portion 162 is the depth of the groove portions 153 , 153 , 153 , 153 . Groove introduction portions 153A, 153A, 153A, and 153A are formed by the groove portions 153, 153, 153, and 153 on the center side of the disc body 150. As shown in FIG. The groove introduction portion 153A is provided continuously with the through hole 152. As shown in FIG.

Further, the inner end of the rear groove inner surface portion 162 intersects with the arcuate inner surface portion 170K at the inner vertical edge portion 159K. On the other hand, the inner end of the front groove inner surface portion 161 intersects with the circular arc inner surface portion 170K at the inner intersection portion 159B and the bottom portion 160 . The inner vertical edge portion 159K and the arc inner surface portion 170K are provided at the positions of the inner intersection portion 159 and the arc inner edge portion 170, respectively.

The disk body 150 has a fixing structure for fixing the blade portion 151 . This fixing structure includes a plurality (four in this example) of pilot holes 171 formed on one side surface of the disk body 150 and a plurality (two in this example) protruding from one side surface of the disk body 150. and positioning projections 172 of the . The pilot holes 171 are provided between the grooves 153 adjacent to each other in the rotation direction. Adjacent to a portion of these pilot holes 171, the positioning projection 172 is provided on the rear side in the rotational direction. The pilot holes 171 are provided at equal intervals (in this example, at intervals of 90 degrees) in the circumferential direction. Similarly, the positioning projections 172 are also provided at regular intervals (in this example, at intervals of 180 degrees) in the circumferential direction. On the other hand, the blade portion 151 is formed with a tapered hole 173 corresponding to the pilot hole 171 and a positioning hole portion 174 corresponding to the positioning protrusion 172 . The tapered hole portion 171A is formed in the upper portion of the pilot hole 171 so that the conical surface of the tapered hole 173 extends. Further, the positioning protrusion 172 is engaged with the positioning hole 174 . The positioning projections 172 and the positioning holes 174 constitute positioning means. The tapered hole 173 has a diameter larger than that of the positioning protrusion 172 . Therefore, even if the positioning protrusion 172 is accidentally inserted into the tapered hole 173, the position cannot be fixed.

As shown in FIG. 18, the blade portion 151 is positioned on the disk body 150 by engaging the positioning protrusion 172 with the positioning hole portion 174 . The blade portion 151 is fixed to the disk body 150 by screwing a countersunk screw 175 inserted through the tapered hole 173 into the pilot hole 171 . In this fixed state, the head portion 175A of the countersunk screw 175 is accommodated in the tapered hole 173, so that it does not protrude from one side surface of the blade portion 151. As shown in FIG. Further, the height of the positioning projection 172 is lower than the thickness of the blade portion 151 . Therefore, the positioning projection 172 does not protrude from one side surface of the blade portion 151 while being engaged with the positioning hole portion 174 . Also, the countersunk screw 175 is a fixing means. The countersunk screw 175 is made of a rust-proof metal (stainless steel in this example). The pilot hole 171 may be a simple cylindrical hole, or a female screw may be formed on the inner surface of the cylindrical hole. However, in this example, since the disk body 150 is made of POM, PBT, or the like, it is not realistic to form a female screw. Therefore, in this example, the pilot hole 171 is a simple cylindrical hole, and the countersunk screw 175 is a tapping screw.

As shown in FIG. 19, the disk body 150 is provided with a lightening portion 181 on the other side surface thereof. Specifically, an outer peripheral cylindrical portion 182 is provided around the plate-shaped flat portion 164, a central cylindrical portion 184 is provided in the center of the flat portion 164, and a curved plate-shaped grooved portion 185 is formed. As a result, the lightening portion 181 with the other side recessed is formed. The outer peripheral surface 150</b>G is formed on the outer peripheral cylindrical portion 182 . Also, the central tube portion 184 is formed at the center of the flat portion 164 . The arc inner surface portion 170K forming the through hole 152 is provided on the inner surface of the central tubular portion 184 . Furthermore, the groove portion 153 is formed in the groove forming portion 185 . A mounting boss 183 is formed on the flat portion 164 so as to protrude to the other side. The attachment boss 183 is formed with the pilot hole 171 for attaching the blade portion 151 . In addition, the mounting boss 183 protrudes from the other flat side surface of the flat portion 164 .

A pair of mounting bosses 186, 186, which are mill blade mounting portions, protrude from the other side surface of the disc body 150 in close proximity to the pair of mounting bosses 183, 183 facing each other. Furthermore, the mounting boss 183 and the mounting boss 186 each have a substantially cylindrical shape. Parts of the adjacent mounting bosses 183 and 186 are formed integrally. The screws 38, 70 screwed with the mounting bosses 186, 186 are made of rust-proof metal (stainless steel in this example). The pilot hole 186A may be a simple cylindrical hole, or a female screw may be formed on the inner surface of the cylindrical hole. However, in this example, since the disk body 150 is made of POM, PBT, or the like, it is not realistic to form a female screw. Therefore, in this example, the pilot hole 186A is a simple cylindrical hole, and the screws 38 and 70 are tapping screws.

Next, a manufacturing process of the rotary blade 22 and the fixed blade 24 will be described. First, the manufacturing process of the blade portion 151 will be described. The blade portion 151 is formed by punching out a stainless steel plate of a certain thickness by press working. By this press working, a disk-shaped blade portion 151 is punched out from the stainless steel plate. At the same time, the blade portion 151 is formed with the through hole 152H, the groove opening portion 155, the tapered hole 173, and the positioning hole portion 174. As shown in FIG. Note that the tapered hole 173 is a simple through hole at this stage. In this way, when the metal plate 151A is punched out from the upper surface side by a male die, the edge of the upper surface side of the metal plate 151A is formed into a substantially rounded shape due to plastic deformation. On the other hand, burrs protrude downward from the lower edge of the metal plate 151A. Then, burrs are removed by scraping the lower surface of the metal plate 151A so as to be flat. By removing the burrs in this manner, the groove opening 155 is formed with substantially right-angled and sharp edges that constitute the cutter blade 157 . By arranging the lower surface of the metal plate 151A on one side, a sharp cutter edge 157 can be provided on one side of the mill blade. The tapered hole 173 is countersunk after pressing. In this manner, the blade portion 151 having the cutter blade 157 can be manufactured easily and inexpensively by punching a hole by press working and simple deburring after that. Further, since the blade portion 151 is made of stainless steel, rust does not occur and it is suitable for washing with water.

If the disc body 150 is made of engineering plastic such as POM or PBT, that is, synthetic resin, it is molded by molding such as injection molding. On the other hand, when it is made of a rust-proof metal such as an aluminum alloy, it is formed by casting using a mold, such as die casting or shell mold casting. Since the disk body 150 is made of synthetic resin or rust-proof metal, rust does not occur and it is suitable for washing with water.

Then, as described above, the blade portion 151 and the disk body 150 are fixed by the countersunk screw 175 and integrated. Since the countersunk screw 175 is made of stainless steel, it does not rust and is suitable for washing with water.

In this way, the rotary blade 22 and the fixed blade 24 use a hard material only for the blade portion 151, and the disc body 150, which serves as a holder for the blade portion 151, is made of synthetic resin or the like which is easy to mold and inexpensive. Since the material is used, molding is easy and the cost as a whole is low.

Next, an example of how to use the coffee maker 1 will be described. First, the user pulls out the dripper 8 horizontally from below the eaves 5 , sets the paper filter 146 in the dripper 8 , and then pushes the dripper 8 horizontally below the eaves 5 . Then, the beverage server 13 is placed on the heating plate 11 of the placing section 4 . In addition, when the beverage server 13 is set on the heating plate 11, the convex portion 16A having a curved surface provided on the lid 16 of the beverage server 13 comes into contact with the liquid stop valve 147, The stop valve 147 is pushed up and opened. Then, an amount of water corresponding to the number of cups of coffee liquid to be extracted is put into the water storage part 6 . Further, the lid 89 of the mill portion 17 is removed, and a predetermined amount of coffee beans is put into the hopper 86 through the upper opening 85, which is an inlet. At this stage, the shutter 143 blocks the drop opening 62, and the mill section 17 and the inside of the dripper 8 are not communicated with each other.

When the user operates the switch 10, four actions are performed simultaneously. The first is that the shutter advance/retreat means (not shown) moves the shutter 143 in the direction to open the drop port 62 . As a result, the drop port 62 opens and the mill portion 17 communicates with the inside of the dripper 8 . The second is to operate the mill device 20 . As a result, the coffee beans are ground by the mill device 20 to obtain coffee powder, and the coffee powder is dropped and supplied from the drop port 62 into the paper filter 146 of the dripper 8 . The third is to start energizing the heating means 7 . As a result, the water in the water reservoir 6 is heated to become hot water. Furthermore, the fourth step is to start energizing the heater 12 . Thereby, the beverage server 13 placed on the heating plate 11 is warmed.

In the mill device 20, the dial 72 is operated before the coffee beans are put in to adjust the desired particle size. Then, when the electric motor 21 is operated to operate the mill device 20, the rotation of the electric motor 21 is reduced by the reduction gear group 129, transmitted to the driving gear 122, and meshed with the driving gear 122. The driven gear 33 rotates.

In this case, as shown in FIG. 14, the drive gear 122 rotates so that the side that meshes with the driven gear 33 moves downward. As a result, a force acts to press the driven gear 33 and thus the mill portion 17 downward when a load is applied. That is, since the force acts in the direction opposite to the direction in which the mill portion 17 is removed from the case body 2, the mill portion 17 can be stably driven.

Coffee beans fall from the lower openings 87, 87 of the hopper 86 into the chute portion 88 and are sent into the storage tube portion 55 by the rotating mill screw 35. As shown in FIG. Then, the coffee beans are crushed by the fixed blade 24 and the rotating rotary blade 22 in the storage tube portion 55 .

Specifically, the coffee beans are sent from the through hole 152 of the fixed blade 24 to the groove introducing portions 153A, 153A, 153A, 153A of the rotary blade 22 and the fixed blade 24 by the rotating mill screw 35 . The coffee beans fed by the rotary motion of the rotary blade 22 are crushed by the cutter blades 157, 157, 157, 157 of the blade portions 151, 151 facing each other. That is, the coffee beans sent to the groove introducing portions 153A, 153A, 153A, 153A are first sheared by the cutter blade 157. As shown in FIG. At this time, the coffee beans are not cut in two but are coarsely ground. The coffee beans coarsely ground by the cutter blade 157 are sent to the respective grooves 153 on the rear side of the cutter blade 157 in the rotational direction. The groove portion 153 of the rotary blade 22 and the groove portion 153 of the fixed blade 24 cooperate to feed the crushed coffee beans in the centrifugal direction of the rotary blade 22 and the fixed blade 24, and the cutter of the rotary blade 22 is fed. The blades 157, 157, 157, 157 and the cutter blades 157, 157, 157, 157 of the fixed blade 24 cooperate to further shear and finely grind the ground coffee beans. The coffee beans pulverized by the cutter blades 157, 157, 157, 157 are further sent to the grooves 153, 153, 153, 153 on the rear side in the rotation direction, and then these grooves 153, 153, 153, 153 It is sent in the centrifugal direction in the same way, and further finely pulverized. By repeating the movement and crushing of the coffee beans in this manner, the coffee beans are finely crushed and discharged from the outer peripheries of the rotary blade 22 and the fixed blade 24 .

The disk body 150 has a groove group 154 made up of a plurality of grooves 153, 153, 153, 153 formed so as to be thinner and shallower toward the outer circumference. Therefore, the coffee beans sent to the groove introducing portion 153A are pulverized so as to gradually become finer as the depths of the groove portions 153, 153, 153, 153 change. Therefore, since the coffee beans are not finely pulverized all at once, the coffee beans can be efficiently ground even with the electric motor 21 having a small output. Furthermore, even with the electric motor 21 having a small output, the coffee beans can be satisfactorily ground at a low speed using the speed reduction mechanism, so that the temperature of the coffee beans does not rise much during grinding. Therefore, the flavor of coffee beans is less likely to be spoiled.

Further, on one surface side of the rotary blade 22 and the fixed blade 24, the groove opening 155 and the through hole 152H are formed in the same shape, and the blade portions 151, 151 are formed rotationally symmetrically. Therefore, by combining the rotary blade 22 and the fixed blade 24 and crushing the coffee beans between them, the coffee beans are crushed at symmetrical positions about the rotary shaft 48 . Therefore, the coffee beans can be satisfactorily ground with a substantially uniform load when the coffee beans are ground.

Note that the milling device 20 stops after a time sufficient to grind all the predetermined amount of coffee beans has passed.

Then, when the operation of the mill device 20 stops, the shutter advance/retreat means (not shown) moves the shutter 143 so that the shutter 143 closes the drop opening 62 . After the shutter 143 closes the drop port 62 , the water in the water reservoir 6 is heated to a predetermined temperature (85 to 90° C.) by the heating means 7 . When it is detected by a temperature sensor (not shown) that the hot water in the water reservoir 6 reaches a predetermined temperature, power supply to the heating means 7 is stopped. Hot water is sent to the hot water supply unit 18 through the liquid sending path 9A by the hot water supply means 9, and the hot water is jetted obliquely downward from the plurality of nozzles 145. As shown in FIG. After the hot water supply by this injection is continuously performed for a predetermined time, for example, 8 seconds, the hot water supply is stopped for 20 seconds, which is the predetermined steaming time, during which coffee grounds are steamed.

After the steaming time has passed, all the hot water in the water reservoir 6 is continuously supplied. As described above, since the amount of water in the water reservoir 6 corresponds to the number of cups of coffee liquid to be extracted, if all hot water in the water reservoir 6 is supplied to the dripper 8, A predetermined number of cups of liquid coffee is obtained, and the inside of the water reservoir 6 is emptied.

The coffee liquid extracted by the dripper 8 passes through the stop valve 147 , passes through the through hole of the lid 16 , and accumulates in the beverage server 13 . Then, when the beverage server 13 is removed from the mounting portion 4, the stop valve 147 is pushed down by an urging means (not shown) such as a coil spring to close, and the coffee liquid drips from the dripper 8. can be prevented.

To clean the milling device 20 after use, hold the knobs 107 of the sliders 103, 103 so as to narrow the distance between the knobs 107, 107, remove the locking claws 105 from the locking holes 119, and remove the milling device 20. The portion 17 is lifted and removed from the mounting recess 19 . After removing the mill portion 17, the cover member 32 of the rotary blade mounting portion 23 is turned to release the screw engagement of the fixed blade mounting portion 25 with the mill case 51, and the rotary blade is removed from the fixed blade mounting portion 25. Remove the mounting portion 23 by pulling it out.

By disassembling the mill portion 17 into the fixed blade mounting portion 25 and the rotary blade mounting portion 23 in this manner, the fixed blade 24 and the rotary blade 22 are exposed as shown in FIGS. As a result, coffee powder remaining inside the rotary blade 22 and the rotary blade mounting portion 23 and coffee powder remaining inside the fixed blade 24 and the fixed blade mounting portion 25 can be easily cleaned. As described above, the blade portion 151 and the countersunk screw 175 are made of rust-proof stainless steel, and the disk body 150 is also made of a rust-proof synthetic resin or the like. Therefore, the rotary blade 22 and the fixed blade 24 can be cleaned by washing with water. Furthermore, as described above, the screws 38, 70 for fixing the 22 and the fixed blade 24 are also made of stainless steel having antirust properties. Therefore, the rotary blade mounting portion 23 and the fixed blade mounting portion 25, that is, the mill portion 17 can be cleaned by washing with water.

After cleaning the mill portion 17, the mill screw 35 is inserted into the fixed blade mounting portion 25, and the tip of the rotating shaft 48 is inserted into the bearing member 61. The mill portion 17 can be assembled by screwing the female screw portion 45A of the cover member 32 to 55A, so assembly is easy.

After assembling the mill portion 17, when the mill portion 17 is inserted into the mounting recess 19 from above, the outer edge portion 105A of the locking claw portion 105 contacts the corner portion of the bottom surface portion 118A. When the mill portion 17 is pushed downward from here, the coil spring 108 is contracted, and the locking pawl portion 105 passes through the corner portion of the bottom portion 118A and is locked to the locking hole portion 119. As shown in FIG. As a result, the mill portion 17 can be attached to the attachment recess 19 . When the mill portion 17 is mounted in the mounting recess 19 in this manner, the driven gear 33 that descends engages with the driving gear 122 in the mounting recess 19 while rotating. can be reliably engaged. 14, the driven gear 33 meshes with the driving gear 122 while rotating clockwise. When the mill portion 17 is attached to the attachment recess 19, the rotation center axes 122J and 33J of the drive gear 122 and the driven gear 33 are shifted in the horizontal direction and aligned at the same height.

As described above, this embodiment has a disk-shaped base portion 150 and a disk-shaped blade portion 151 integrated with one side of the disk-shaped body 150. The disk-shaped body 150 is located on the outer peripheral side It has a groove group 154 consisting of a plurality of grooves 153, 153, 153, 153 formed so as to be thinner and shallower, and the blade part 151 has the same shape as the rear side groove inner surface part 162 of the groove part 153 and this It has a cutter blade 157 which is an edge portion formed along the rear groove inner surface portion 162, and the blade portion 151 is a metal plate 151A which is a plate material having a constant thickness and is harder than the material constituting the disk body 150. Since it is made of high quality material, only the blade portion 151 is made of a hard material, and the disk body 150 can be made of a material that is easy to process, it can be made at a low cost.

The blade portion 151 is made of a perforated metal plate having a groove opening portion 155 having the same shape as the groove portion 153, and the front side curved edge portion 156 and the cutter blade 157, which are the edges of the blade portion 151, are formed from the metal plate 151A. Since it is formed in the groove opening 155, the blade portion 151 can be manufactured easily and inexpensively by, for example, press working.

Further, since the blade portion 151 is made of the metal plate 151A having antirust property, the mill blade can be washed with water to be clean.

Further, since the blade portion 151 is made of stainless steel, the mill blade can be washed with water to be clean, and the mill blade can be manufactured at a low cost.

In addition, the disk body 150, which is a disk-shaped base made of synthetic resin or rust-proof metal , is integrated with one side of the disk body 150 , has higher hardness than the base, and has rust resistance. A disk- shaped blade portion 151 made of metal , and a plurality of grooves 153, 153, 153, and 153 that become thinner and shallower toward the outer peripheral side are formed in the disk body 150, and the By forming groove openings 155, 155, 155, 155 corresponding to the grooves 153, 153, 153, 153 in the blade part 151, and punching out a metal plate 151A of a constant thickness from the upper surface side by press working, After the blade portion 151 having the groove opening 155 is formed, the lower surface of the metal plate 151A having burrs generated on the edge of the metal plate 151A by the press working is shaved to remove the groove opening 155. Since the cutter blades 157 can have sharp edges, not only can the grinding performance of the mill blades be enhanced, but also the mill blades can be manufactured at low cost.

Further, since the disk body 150, which is the base portion, is formed of synthetic resin by molding, the disk body 150 can be manufactured easily and inexpensively.

In addition, since the disk body 150, which is the base, is made of a rust-proof material that can be molded, the disk body 150 can be manufactured at a low cost by injection molding, mold molding, or the like. The blade can be washed with water to clean it.

Further, since the disk body 150, which is the base, is made of synthetic resin, not only can the disk body 150 be manufactured at a low cost, but also the mill blade can be cleaned by washing with water.

Furthermore, a pair of mill blades are installed so that their blade portions 151, 151 face each other, one of which is a fixed blade 24 and the other is a rotary blade 22, so that the mill device 20 can be constructed at a low cost. can be done.

Hereinafter, as an effect of the embodiment, a plurality of sets (four sets in this example) of the groove introduction portion 153A and the groove opening portion 155 are formed, and these sets are formed rotationally symmetrically. Since the coffee beans are pulverized at symmetrical positions about the rotary shaft 48 of the rotary blade 22, the load for pulverizing the coffee beans is substantially equalized and the coffee beans can be pulverized well. In addition, the rotary blade 22 and the fixed blade 24, which are the same mill blade, are installed so that their blade portions 151, 151 face each other, and one side is the rotary blade 22 and the other side is the fixed blade 24. Since the coffee beans are pulverized at symmetrical positions about the rotary shaft 48 of the rotary blade 22, the load for pulverizing the coffee beans is substantially equalized and the coffee beans can be pulverized well. Further, since the cutter blades 157, 157, 157, 157 and the grooves 153, 153, 153, 153 are curved from the central side to the outer peripheral side of the disk body 150 so as to delay in the rotation direction, The ground coffee powder is smoothly discharged toward the outer peripheral surface 150G. Further, since the groove introducing portions 153A, 153A, 153A, 153A communicate with the through hole 152 almost entirely except for the arcuate inner surface portion 170K, the inside of the groove introducing portion 153A is connected from the through hole 152 to the groove introducing portion 153A. is guided to the cutter blade 157 by the groove portion 153, coarsely ground by the cutter blade 157, and then gradually ground to a desired particle size by the cutter blade 157 on the rear side in the rotation direction. .

In addition, since the blade portion 151 is fixed to the disk body 150 by the countersunk screw 175 as screw fixing means, one of the blade portion 151 and the disk body 150 can be replaced. Furthermore, since the lightening portion 181 is formed on the other side surface of the disk body 150, the material cost of the disk body 150 can be reduced, and the weight can be reduced at the same time. Further, since the groove introducing portions 153A, 153A, 153A, 153A communicate with the through hole 152 almost entirely except for the arcuate inner surface portion 170K, the coffee beans and the like sent through the through hole 152 are communicated with each other. can be smoothly guided to the groove portion 153 . Furthermore, since the positioning means comprising the positioning protrusion 172 and the positioning hole 174 is provided, the work of assembling the blade portion 151 and the disk body 150 can be easily and reliably performed. In addition, since the upper surface of the head portion 175A of the countersunk screw 175 and the upper surface of the positioning projection 172 are accommodated below one side surface of the blade portion 151 in the attached state, the head portion 175A of the countersunk screw 175 and the positioning projection 172 are stored below one side surface of the blade portion 151. The protrusion 172 does not interfere with the other blade portion 151 . Furthermore, since the head portion 175A of the countersunk screw 175 is engaged with the tapered hole portion 171A of the disc body 150 and the tapered hole 173 of the blade portion 151, the positioning effect of the disc body 150 and the blade portion 151 is enhanced. can get. In addition, since the arcuate inner surface portion 170K, which is a partition portion that partitions the adjacent groove portions 153, 153, is vertically provided continuously with the through hole 152, the coffee beans are distributed substantially evenly in the plurality of groove portions 153. etc. can be supplied. Further, since the adjacent mounting bosses 183 and 186 are partly integrally molded, the mounting strength of the blade portion 151 to the disk body 150 and the mounting strength of the mill blade itself can be improved. . In addition, the metal plate 151A made of stainless steel and having a constant thickness is punched to form the through holes 152H and the groove openings 155 by pressing. and forming a right-angled edge that constitutes the cutter blade 157. Therefore, by arranging the lower surface of the metal plate 151A on one side, the sharp edge on one side of the mill blade is formed. Since the cutter blade 157 can be provided and the cutter blade 157 can be sharpened by simple deburring, not only can the grinding performance of the mill blade be improved, but also the mill blade can be manufactured at a low cost. can.

A case main body 2 as a main body, a mill portion 17 provided in the upper portion of the case main body 2 for crushing coffee beans as a beverage raw material and discharging them, and a mill portion 17 provided in the case main body 2 for operating the mill portion 17. In the mill device 20 having an electric motor 21 for A disc-shaped rotary blade 22 connected to and detachably attached to the mill section 17, and a disc-shaped fixed blade 24 provided opposite to the rotary blade 22 and fixed to the mill section 17. In addition, the case body 2 has a drive gear 122 which is a driving-side transmission mechanism which is rotated by the electric motor 21 and is detachably coupled to the driven gear 33. By removing the rotary blade 22 together with the driven gear 33 from the mill portion 17 after removing the entire assembly, not only can the rotary blade 22 be easily maintained, but also the mill portion 17 can be held and the Maintenance of the fixed blade 24 can be easily performed.

Since the drive side transmission mechanism is the drive gear 122 and the driven side transmission mechanism is the driven gear 33, the degree of freedom in attaching and detaching the mill portion 17 to the case body 2 can be increased.

Further, the rotation center axis 122J of the drive gear 122 is provided horizontally, and the mill portion 17 can be attached to and detached from the case main body 2 from above the rotation center axis 122J. Since it does not engage and disengage in parallel with the direction, not only can the mill portion 17 be easily attached to and detached from the case body 2, but also the gears 33 and 122 can be easily meshed with each other.

Further, since the mill screw 35 is provided in the rotary blade mounting portion 23, by removing the rotary blade mounting portion 23 from the fixed blade mounting portion 25, the mill screw 35 is pulled out from the guide wall portion 58, and the The inside of the mill case 51 can be cleaned easily. In addition, since the stationary blade 24 and the rotary blade 22 are housed in the housing cylinder portion 55 in the state where the mill portion 17 is assembled, coffee grounds are stored between the rotary blade 22 and the cover member 32. is difficult to invade and easy to maintain. Further, the grain size adjusting means 65 is incorporated into the fixed blade mounting portion 25, the fixed blade holder 66 is inserted through the front wall portion 56 of the storage cylinder portion 55, and the rear side of the fixed blade holder 66 is inserted into the storage cylinder portion. 55, the fixed blade holder 66 is configured to be adjustable in the forward and rearward positions, and the position of the fixed blade 24 is adjusted, so that the particle size of the beverage ingredients can be stably adjusted. Furthermore, since the left and right operating recesses 118, 118 are formed on the left and right sides of the rear recess 117 corresponding to the left and right sliders 103, 103, the mill portion 17 can be easily removed. Further, since the rear end of the hub portion 46 of the driven gear 33 is loosely inserted into the vertical concave portion 138 from the upper opening 138A thereof, when the mill portion 17 is attached, the hub portion 46 of the driven gear 33 is The installation work can be stably performed by being guided by the vertical recess 138 . Furthermore, a pair of protrusions 37, 37 that sandwich the periphery of the rotary blade 22 are provided around the front surface of the mounting plate 34 so as to protrude forward. Rotating close to the inner periphery of the cylindrical housing portion 55 removes the coffee grounds accumulated on the inner periphery of the cylindrical housing portion 55 .

Further, the reduction gear group 129 has four shafts 131, 131, 131, 131 projecting from the rear part of the first rotary plate 130, and each of the shafts 131, 131, 131, 131 is a planetary gear. Reduction gears 132, 132, 132, 132 are rotatably provided, and the motor side gear 126, which is a sun gear, is connected to each reduction gear 132, 132, 132, 132 at the center of these reduction gears 132, 132, 132, 132. The transmission gear 133, which is a sun gear, is integrally provided at the center of the front side, which is one side surface of the first rotating plate 130, and the transmission gear 133 is provided at the rear side, which is the other side surface of the second rotating plate 130A. A plurality of reduction gears 132A, 132A, 132A, and 132A, which are planetary gears having a smaller number of teeth than the gear 133, are rotatably provided, and the reduction mechanism is constituted by the planetary gear mechanism in this way, so that a high reduction effect can be achieved in a small space. is obtained.

Further, since the drop port 62 of the mill portion 17 is provided at the center of the plurality of nozzles 145, the coffee powder can be dropped and supplied to the center of the dripper 8. Further, the drop port 62 can be opened and closed by the shutter 143 as opening/closing means. Further, by attaching and detaching the mill portion 17 to and from the mounting recess 19 , the drop port 62 can be connected and disconnected to the insertion hole 142 as a connection receiving portion of the hot water supply portion 18 .

20 and 21 show Embodiment 2 of the present invention, the same parts as those in Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. The same figure shows a modification of the rotary blade 22 and the fixed blade 24 .

In this example, the disc body 150 is not provided with the pilot hole 171 and the positioning protrusion 172 . Therefore, the tapered hole 173 and the positioning hole 174 are not provided in the blade portion 151 . In manufacturing, insert molding is performed. That is, in a state in which the blade portion 151 is placed in a molding die (not shown), molten resin is filled in the molding die, and the resin is solidified to form the disk body 150, and the disk body 150 is formed. 150 and the blade portion 151 are integrated.

Thus, in this embodiment, the same functions and effects as in the first embodiment are obtained. Further, in this example, since the disk body 150 and the blade portion 151 are integrated by insert molding, a fixing structure and fixing work are not required.

Embodiment 3 of the present invention is shown in FIG. 22, and the same parts as in the above embodiments are given the same reference numerals, and the explanation thereof is omitted. The figure shows an electric milling device 200, in which a case body 201 is provided with a milling section 17 and a driving unit 121. As shown in FIG.

As shown in the figure, the case body 201 has a substantially rectangular parallelepiped shape. A mounting recess 19 is provided in the upper portion of the case body 201 , and the mill portion 17 is detachably mounted in the mounting recess 19 . Further, the drive unit 121 is built in the upper rear side of the case main body 201 .

A storage case 202 for storing the coffee powder dropped from the drop port 62 of the mill portion 17 is built in the lower front side of the case main body 201 . The storage case 202 is constructed so as to be able to be pulled out from an opening 203 provided in the front lower portion of the case main body 201, and a handle portion 204 is provided on the front surface.

As described above, the present embodiment is a mill device 200 provided with the rotary blade 22 and the fixed blade 24, which are mill blades, and these rotary blade 22 and the fixed blade 24, and thus has the same functions and effects as those of the first embodiment. play.

A case main body 201 as a main body, a mill portion 17 provided on the upper portion of the case main body 201 for crushing and discharging coffee beans as a beverage raw material, and a mill portion 17 provided in the case main body 201 to operate the mill portion 17. In a mill device 200 having an electric motor 21 for A disc-shaped rotary blade 22 connected to and detachably attached to the mill section 17, and a disc-shaped fixed blade 24 provided opposite to the rotary blade 22 and fixed to the mill section 17. In addition, the case body 201 has a driving gear 122 which is a drive-side transmission mechanism that is rotated by the electric motor 21 and detachably coupled to the driven gear 33. It works.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the invention. For example, in the above embodiment, the number of cutter blades and grooves is four, but the number of cutter blades and grooves may be two, three, or five or more. Further, in the above embodiment, curved groove openings and grooves were shown, but the groove openings and grooves may be substantially triangular. It is preferable to arrange the groove opening and the groove obliquely so that the groove is located on the rear side in the rotation direction from the inner intersection. Furthermore, although it is preferable that the rotation center axes of the driven gear and the drive gear are at the same height, the rotation center axis of the driven gear is positioned higher than the rotation center axis of the drive gear so that the driven gear and the drive gear mesh. Also good. In this case, it is preferable to shift the plane positions of the rotation center axes so that the rotation center axes are not positioned directly above each other. Also, the mill apparatus of the present invention is suitable for grinding coffee beans, but it may also be used for grinding other than coffee beans, such as tea.

20 mill device 22 rotary blade (mill blade)
24 fixed blade (mill blade)
150 disk body (base)
150G outer peripheral surface 151 blade portion 151A metal plate (plate material)
152 through-hole 152H through-hole (hole)
153 groove 154 groove group 155 groove opening (hole)
156 front curved edge (edge)
157 cutter blade (edge)
162 Rear groove inner surface

Claims (2)

A disk-shaped base made of synthetic resin or metal having antirust properties ;
a disk-shaped blade integrated with one surface of the base and made of a metal having higher hardness and rust resistance than the base ;
A method for manufacturing a mill blade having
Forming a plurality of grooves that become narrower and shallower toward the outer periphery in the base, and forming groove openings corresponding to the grooves in the blade,
A metal plate having a constant thickness is punched from the upper surface side by press working to form the blade portion having the groove opening, and then the metal plate having burrs generated on the edge of the metal plate by the press working. A method for manufacturing a mill blade, wherein the edge of the groove opening is formed into a sharp cutter blade by flattening the lower surface . 2. The method of manufacturing a mill blade according to claim 1, wherein said base is formed of synthetic resin by molding.

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