Grinding device

Abstract

[Subject] The present invention provides a grinding device that can suppress the generation of noise or vibration by suppressing the instantaneous load when crushing coffee beans to a lower level. [Solution] The grinding device of the present invention comprises: a fixed knife, which is provided with a knife portion having a plurality of grooves; and a rotating knife, which is provided with a knife portion having a plurality of grooves; when the knife portions of the fixed knife and the rotating knife are facing each other, the rotating knife rotates relative to the fixed knife, and since the circumferential spacing of the grooves of the fixed knife and the circumferential spacing of the grooves of the rotating knife are different, the crushing time of the coffee beans can be staggered to reduce the instantaneous load applied to the fixed knife and the rotating knife, thereby reducing the vibration and noise of the grinding device.

Description

Technical Field

[0001] The present invention relates to a grinding device having a pair of fixed blades and a rotating blade provided with blade parts on one side, and the blade parts of the fixed blade and the rotating blade are made to face each other and rotate relative to each other. Background Art

[0002] Conventionally, as such a grinding device, for example, there is known a grinding device in which a pair of grinding knives having a plurality of introduction recesses (equivalent to the grooves of the present invention) formed on a disk body are arranged so that the introduction recesses face each other, one of the grinding knives is a fixed knife and the other is a rotating knife (see, for example, Patent Document 1). This grinding device is configured to shear and crush the coffee beans that have entered between the introduction recesses using a cutting knife formed at the rear edge of the introduction recesses and then grind them into finer pieces.

[0003] [Background Technology Literature]

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-94188 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, in this grinding device, the number of grooves of the fixed blade and the grooves of the rotating blade are the same and are arranged at equal intervals, so that coffee beans enter the grooves of the fixed blade and the rotating blade at the same time and are crushed at the same time, so that an instantaneous strong load is rhythmically applied to the motor for rotating the rotating blade. Therefore, there is a problem of generating strong vibration or noise.

[0008] An object of the present invention is to provide a grinding device that can solve the above-mentioned problems and suppress the generation of noise or vibration by suppressing the instantaneous load when grinding coffee beans to a low level.

[0009] [Methods used to solve the problem]

[0010] The grinding device described in technical solution 1 of the present invention comprises: a fixed knife, which is provided with a knife portion having multiple grooves; and a rotating knife, which is provided with a knife portion having multiple grooves; when the knife portions of the fixed knife and the rotating knife are facing each other, the rotating knife rotates relative to the fixed knife, wherein the circumferential direction spacing of the grooves of the fixed knife is different from the circumferential direction spacing of the grooves of the rotating knife.

[0011] In addition, the grinding device described in technical solution 2 of the present invention is like technical solution 1, in which the grooves of the fixed knife are formed at equal intervals in the circumferential direction, the grooves of the rotating knife are formed at equal intervals in the circumferential direction, and the number of grooves formed in the fixed knife is different from the number of grooves formed in the rotating knife.

[0012] In addition, in the grinding device described in claim 3 of the present invention, as in claim 2, the number of grooves formed on the fixed blade and the number of grooves formed on the rotating blade are set to have no common divisor relationship.

[0013] Furthermore, in the grinding device described in claim 4 of the present invention, as in claim 1, the grooves of either the fixed blade or the rotating blade are formed at unequal intervals in the circumferential direction.

[0014] [Effects of the invention]

[0015] The grinding device described in claim 1 of the present invention can reduce the instantaneous load applied to the fixed blade and the rotating blade by staggering the grinding timing of the coffee beans through the above-mentioned configuration, thereby reducing the vibration and noise of the grinding device.

[0016] Furthermore, by forming the grooves of the fixed blade at equal intervals in the circumferential direction, forming the grooves of the rotating blade at equal intervals in the circumferential direction, and making the number of grooves formed on the fixed blade different from the number of grooves formed on the rotating blade, the coffee beans are crushed at equal intervals, thereby further reducing the vibration and noise of the grinding device.

[0017] In addition, by setting the number of grooves formed in the fixed blade and the number of grooves formed in the rotating blade to have no common divisor relationship, there is no moment when the coffee beans are crushed at multiple locations at the same time. Therefore, the instantaneous load applied to the fixed blade and the rotating blade can be further reduced, and the vibration and noise of the grinding device can be further reduced.

[0018] Furthermore, by forming the grooves of either the fixed blade or the rotating blade at unequal intervals in the circumferential direction, the grinding time of the coffee beans can be staggered to reduce the instantaneous load applied to the fixed blade and the rotating blade, thereby reducing the vibration and noise of the grinding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view showing a state in which a grinding unit is removed in a coffee machine equipped with an electric grinder as a grinding device according to a first embodiment of the present invention.

[0020] Figure 2 Same as above, this is a three-dimensional diagram of the drive unit.

[0021] Figure 3Same as above, it is an overall three-dimensional picture.

[0022] Figure 4 Same as above, this is an overall illustration.

[0023] Figure 5 Same as above, this is an exploded perspective view of the area around the rotating blade mounting portion.

[0024] Figure 6 Same as above, this is an exploded perspective view of the area around the fixed blade mounting portion.

[0025] Figure 7 The same as above is an exploded perspective view of the grinding part and the surrounding area of ​​the grinder housing.

[0026] Figure 8 The same as above is a longitudinal cross-sectional view of the grinding part in the front-rear direction.

[0027] Fig. 9 Same as above, this is a plan cross-sectional view of the grinding section.

[0028] Fig.10 As above, this is a longitudinal cross-sectional view of the grinding part in the left-right direction.

[0029] Fig.11 Same as above, this is an exploded perspective view of the drive unit.

[0030] Fig.12 As above, this is an exploded perspective view of the grinding unit in a state where the fixed blade is exposed.

[0031] Fig.13 As above, this is an exploded perspective view of the grinding unit in a state where the rotating blade is exposed.

[0032] Fig.14 As above, this is an explanatory diagram for explaining the meshing between the driving gear and the driven gear.

[0033] Fig.15 Same as above, it is an exploded stereogram of the rotary knife.

[0034] Fig.16 Same as above, it is a three-dimensional picture of the rotating knife.

[0035] Fig.17 Same as above, it is the top view of the rotating knife.

[0036] Fig.18 Same as above, this is a top view of the fixed knife.

[0037] Fig.19 Same as above, this is a top view. Fig.19 (A) is a top view of the rotating knife. Fig.19 (B) is a top view of the fixed knife.

[0038] Fig. 20 Same as above, this is a cross-sectional view of the main parts. Fig. 20 (A) is a cross-sectional view of the main part of the rotary blade. Fig. 20 (B) is a cross-sectional view of the main part of the fixed knife.

[0039] Fig.21 The same as above is a three-dimensional view of the back side of the rotary blade.

[0040] Fig. 22 It is an exploded perspective view showing the rotary knife according to the second embodiment of the present invention.

[0041] Fig.23 Same as above, it is a three-dimensional picture of the rotating knife.

[0042] Fig.24 This is a perspective view showing a state in which a grinding unit is removed in an electric grinder as a grinding device according to a third embodiment of the present invention.

[0043] Fig.25 It is a top view showing a stationary blade according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0044] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the embodiments described below do not limit the content of the present invention described in the claims. In addition, all the configurations described below are not necessarily essential conditions of the present invention.

[0045] [Example 1]

[0046] The following is based on Figure 1 to Figure 21 Embodiment 1 of the present invention will be described. 1 is a coffee machine with an electric grinder as a grinding device. The main body of the coffee machine 1, that is, a housing body 2, includes a rear standing portion 3, a front placing portion 4 formed integrally with the lower portion of the standing portion 3, and an eaves portion 5 formed integrally with the upper portion of the standing portion 3. In addition, 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 detachably provided in the housing body 2, and a water storage container (not shown) is built into the water storage portion 6.

[0047] like Figure 4 As shown, a heating device 7 for heating the water in the water storage container is provided in the water storage portion 6. In addition, a hot water delivery device 9 is provided in the housing body 2, and the hot water delivery device 9 delivers the hot water heated by the heating device 7 to the filter cup 8. In addition, the hot water delivery device 9 may be, for example, a pump or the like.

[0048] The placing portion 4 has an opening on the top, and a substantially planar heating plate 11 is provided to cover the opening. A heater 12 is provided on the lower surface of the heating plate 11 in thermal contact therewith.

[0049] A beverage container 13 is detachably placed on the heating plate 11. The beverage container 13 includes a heat-resistant glass container body 14 with an upper opening, a synthetic resin gripper 15 attached to a side plate of the container body 14, and a synthetic resin cover 16 covering the upper opening of the container body 14.

[0050] On the side of the upright portion 3 and above the beverage container 13 of the placement portion 4, a grinding portion 17, a hot water supply portion 18, and the filter cup 8 as an extraction portion are arranged from top to bottom.

[0051] The grinding device 20 includes: the grinding part 17, which is provided at the upper part of the housing body 2 and grinds and discharges coffee beans as a beverage raw material; and a motor 21, which is provided at the housing body 2 and drives the grinding part 17. In addition, in the housing body 2 and the grinding device 20, the front side is one side in the front-back direction, and the rear side is the other side in the front-back direction.

[0052] The grinding part 17 is detachably mounted to the mounting recess 19 of the housing body 2. Fig.12 and Fig.13 As shown, the grinding section 17 is configured to be disassembled into a rotating blade mounting section 23 provided with a disc-shaped rotating blade 22, and a fixed blade mounting section 25 provided with a disc-shaped fixed blade 24. In addition, the rotating blade 22 and the fixed blade 24 are disc-shaped as a whole.

[0053] like Figure 5 As shown in the figures, the rotating blade mounting portion 23 includes the rotating blade 22, a rotating bracket 31 for mounting the rotating blade 22, a cover member 32, and a driven gear 33 as a driven side transmission mechanism from the front side. The rotating bracket 31 integrally includes a disc-shaped mounting plate 34 for mounting the rotating blade 22 and a mill screw 35 protruding from the center of the mounting plate 34 to the front side, and a through hole 36 is provided through the center of the mill screw 35. In addition, a pair of protrusions 37, 37 are provided to protrude to the front side around the front surface of the mounting plate 34 to clamp the rotating blade 22.

[0054] A knife portion 151 is provided on the front surface of one side of the rotating knife 22, and a through hole 152 is provided through the center of the rotating knife 22. In addition, a plurality of through holes 34A are provided through the mounting plate 34, such as Figure 8As shown in the figure, the rotating blade 22 is mounted on the mounting plate 34 by screwing a screw 38 inserted into the through hole 34A from the rear side into the reserved hole 186A of the mounting boss 186 on the rear surface of the rotating blade 22. In addition, the screw 38 is a screw-type fixing device. In addition, the screw 38 is made of a rust-resistant metal (in this example, stainless steel).

[0055] The cover member 32 is provided with a through hole 42 at the center of the circular plate portion 41, and a mounting cylinder portion 43 having a center hole larger than the diameter of the through hole 42 is protruded from the front surface of the circular plate portion 41, and a bearing member 44 is fixed in the mounting cylinder portion 43. In addition, an outer cylinder portion 45 is integrally provided around the circular plate portion 41, and the outer cylinder portion 45 is protruded forward, and an internal thread portion 45A is provided on the inner periphery of the outer cylinder portion 45. In addition, a plurality of anti-slip recesses 45B, 45B are provided on the outer periphery of the outer cylinder portion 45 to constitute an anti-slip portion.

[0056] A through hole 47 is formed through the hub portion 46 at the center of the driven gear 33, and a flat surface portion (not shown) serving as a rotation shaft engagement portion is formed on the inner circumferential surface of the through hole 47. In addition, a rotation shaft 48 made of a metal rod or the like is fixed to the through hole 36 of the grinder screw 35 by insert molding or the like. The rear side of the rotation shaft 48 is inserted into the bearing member 44 so as to be rotatable, and the rear end thereof is inserted into the through hole 47 of the driven gear 33 in a rotationally stopped state. In addition, the driven gear 33 is fixed to the rotation shaft 48 by screwing a screw 49 into the rear end of the rotation shaft 48.

[0057] Thus, the mounting plate 34 and the driven gear 33 of the grinder screw 35 are integrally provided so as to be rotatable relative to the cover member 32. By using the mounting plate 34, the driven gear 33 and the rotating shaft 48 integrally provided with the grinder screw 35, as shown in FIG. Figure 5 The driven side transmission structure 50 is shown as being constructed.

[0058] like Figure 7 As shown in FIGS. 1 and 1 , the fixed blade mounting portion 25 includes a grinder housing 51 , an upper housing 52 mounted on an upper portion of the grinder housing 51 , and a lower housing 53 mounted on a lower portion of the grinder housing 51 .

[0059] The grinder housing 51 has a cylindrical storage cylinder 55 for storing the rotating blade 22 and the fixed blade 24. A front wall 56 is provided at the front end of the storage cylinder 55. A through hole 56A is formed in the center of the front wall 56, and a guide cylinder 57 is provided protrudingly on the rear side of the through hole 56A. In addition, a small diameter portion 55B having a smaller diameter than the other portions is formed on the front side of the storage cylinder 55 corresponding to the position of the guide cylinder 57. 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 provided through the center of the fixed blade 24. In addition, the guide cylinder 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 stored between the guide cylinder 57 and the small diameter portion 55B.

[0060] In addition, the fixed blade mounting portion 25 has a guide wall portion 58 having a substantially U-shaped cross section at the front side of the through hole 56A. A vertical wall portion 59 covering the front side of the guide wall portion 58 is provided at the front end of the guide wall portion 58, a through hole 59A is provided in the vertical wall portion 59, and a mounting cylinder portion 60 having a center hole larger than the diameter of the through hole 59A is provided protruding forward from the vertical wall portion 59.

[0061] A bearing member 61 is fixed in the mounting cylinder 60, and the front end of the rotating shaft 48 is detachably inserted into the bearing member 61 from the rear side. In addition, the rear portion of the storage cylinder 55 is open, and an external thread portion 55A is formed on the outer periphery of the storage cylinder 55, and the internal thread portion 45A of the cover member 32 is detachably screwed into the external thread portion 55A of the storage cylinder 55.

[0062] And, if Figure 8 As shown, by inserting the front end side of the rotating shaft 48 from the rear side into the through hole 56A of the storage cylinder 55 and the through hole 59A of the guide cylinder 57, the internal threaded portion 45A of the cover part 32 is screwed into the external threaded portion 55A of the storage cylinder 55, and the front end of the rotating shaft 48 is inserted into the bearing part 61, and the mounting plate 34 of the rotating bracket 31 and the rotating knife 22 are stored in the storage cylinder 55, and the rotating knife mounting portion 23 is mounted on the fixed knife mounting portion 25, and the rotating bracket 31 is rotatably mounted in the grinding portion 17.

[0063] In addition, a cylindrical drop opening 62 is provided protruding downward at the lower portion of the storage cylinder 55. The drop opening 62 is cylindrical and communicates with the bottom of the storage cylinder 55. The coffee beans are ground into coffee powder (ground beans) between the rotating blade 22 and the fixed blade 24, and the coffee powder in the storage cylinder 55 falls from the drop opening 62 and is supplied to the center of the filter cup 8.

[0064] like Fig. 9 As shown in the figure, a particle size adjusting device 65 for adjusting the degree of crushing (particle size) of the coffee powder is provided in the grinding section 17. The particle size adjusting device 65 adjusts the degree of crushing of the coffee powder by adjusting the interval between the front surface of the rotating blade 22 and the rear surface of the fixed blade 24.

[0065] The particle size adjustment device 65 is described in detail. A fixed blade bracket 66 is provided on the fixed blade mounting portion 25 so as to be able to adjust the front and rear positions. Figure 6 As shown in the figures, the fixed blade bracket 66 has a cylindrical front barrel portion 67 disposed outside the mounting barrel portion 60, and an inner flange portion 67A is disposed around the front end of the front barrel portion 67. In addition, side wall portions 68, 68 are disposed on the left and right sides of the rear side of the front barrel portion 67. These left and right side wall portions 68, 68 are disposed along the outer peripheral surface of the guide wall portion 58. Moreover, mounting portions 69, 69 are disposed at the rear ends of the side wall portions 68, 68, respectively, and in a state where these mounting portions 69, 69 are inserted into the insertion openings 63, 63 of the storage barrel portion 55, the front surface of the fixed blade 24 is fixed to the rear surface of the mounting portions 69, 69.

[0066] like Figure 7 As shown in FIG. 1 , the insertion openings 63, 63 into which the left and right mounting portions 69, 69 are movably inserted are provided on the left and right sides of the front wall portion 56 of the grinder housing 51. Through holes 69A, 69A are respectively provided through the left and right mounting portions 69, 69. Fig. 9 As shown, by inserting the screw 70 ( Fig. 9 ) is screwed into the reserved hole 186A of the mounting boss 186 on the front surface of the fixed knife 24, thereby fixing the fixed knife 24 to the left and right mounting parts 69, 69. In addition, the screw 70 is made of a rust-resistant metal (stainless steel in this example). In addition, between the inner flange portion 67A of the fixed knife bracket 66 and the vertical wall portion 59 of the grinder housing 51, a coil spring 71 as a push device is externally provided on the mounting cylinder portion 60. The coil spring 71 pushes the fixed knife bracket 66 to the grinder housing 51 in a manner that moves the fixed knife bracket 66 to the front side.

[0067] The particle size adjustment device 65 has a rotary dial 72 as an operating part. The dial 72 is fixed to the front of the front plate 74 of the pushing body 73. The pushing body 73 is integrally provided with a pushing cylinder 75 at the rear of the front plate 74, and an internal thread 75A is formed on the pushing cylinder 75. In addition, an external thread 60A is provided on the mounting cylinder 60, and the internal thread 75A is screwed into the external thread 60A. Through this screwing, the pushing body 73 is provided to be able to move forward and backward relative to the grinding machine housing 51.

[0068] Furthermore, by rotating the pushing body 73 in the screwing direction using the dial 72, the pushing cylinder 75 retreats, the fixed knife bracket 66 is pushed to the rear end 75B of the pushing cylinder 75 and retreats, and the coil spring 71 is compressed. As a result, the interval between the fixed knife 24 and the rotating knife 22 is narrowed. On the other hand, when the dial 72 is rotated in the reverse direction, the fixed knife bracket 66 is advanced by the elastic restoring force of the coil spring 71. As a result, the interval between the fixed knife 24 and the rotating knife 22 is opened.

[0069] In addition, if Figure 6 and Fig. 9 As shown, the particle size adjustment device 65 is provided with a click device 77 for regulating the rotation angle of the dial 72. The click device 77 has a cylinder 78. The cylinder 78 is provided with a flange portion 78A around its front outer periphery. Furthermore, the cylinder 78 is inserted into the front cylinder portion 67 of the fixed knife bracket 66, and the flange portion 78A abuts against the front edge of the mounting cylinder portion 60. At this time, the convex portion 60B provided at the front edge of the mounting cylinder portion 60 is engaged with the cutout portion 78B formed in the flange portion 78A, thereby setting the cylinder 78 to a non-rotating state relative to the mounting cylinder portion 60. In addition, a mounting cylinder portion 79 is integrally provided protrudingly on the front side of the cylinder 78 at a position deviating from the center of the cylinder 78. A click rod 80 is inserted into the mounting cylinder portion 79 so as to slide forward and backward, and a coil spring 81 as a spring push device is provided behind the click rod 80 and in the mounting cylinder portion 79. Furthermore, the click lever 80 is pushed forward by the coil spring 81 .

[0070] Furthermore, a plurality of click recesses 83, 83, ... are formed on the front plate portion 74 of the push body 73, into which the click rod 80 is inserted. These click recesses 83, 83, ... are arranged at equal intervals in the circumferential direction with the rotation center of the push body 73 as the center. Fig. 9 As shown, the front end 80S of the click rod 80 is formed as a convex curved surface. The click recess 83 is formed as a stepped hole, and the front end 80S is inserted into the large diameter portion 83A of the stepped hole.

[0071] Therefore, when the dial 72 is rotated in a state where the front end 80S of the click rod 80 is engaged with the click recess 83, the coil spring 81 contracts, the front end 80S of the click rod 80 deviates from the click recess 83, and when the front end 80S is engaged with the adjacent click recess 83, the coil spring 81 is extended by elastic restoring force, thereby obtaining a specified click feeling. In addition, the interval between the fixed blade 24 and the rotating blade 22 can be adjusted according to the number of clicks. Therefore, a scale indicating the degree of crushing can also be provided on the dial 72 corresponding to the click recess 83.

[0072] like Figure 7 As shown in FIG. 1 , the upper housing 52 includes a hopper 86 having a planar circular upper opening 85. The hopper 86 constitutes a part of the upper housing 52. In addition, lower openings 87, 87 are provided on the left and right of the bottom surface 86A of the hopper 86. A slide groove 88 is provided below these lower openings 87, 87, and the lower part of the slide groove 88 is aligned with the guide wall 58 ( Figure 6 ) is connected to the upper opening of the upper housing 52. In addition, a cover body 89 is detachably provided at the upper opening 85 of the upper housing 52.

[0073] An upper front cover portion 91 is integrally provided on the front side of the hopper 86. Figure 8 As shown in the figures, the upper front cover 91 constitutes a part of the upper housing 52 and covers the front upper portion of the grinder housing 51. In addition, an insertion hole 93 for inserting the pressing cylinder 75 is provided through the front surface 92 of the upper front cover 91.

[0074] The lower housing 53 integrally includes a lower housing body 95 covering the lower part of the grinder housing 51 and a U-shaped lower front cover portion 96 covering the lower front part of the grinder housing 51. The front edge portion 96A of the lower front cover portion 96 abuts against the rear surface ( Figure 8 ). In addition, the lower housing 53 covers the rear lower portion of the grinder housing 51 and is fixed to the upper housing 52. Furthermore, a cutout portion 97 is formed on the lower housing body 95, and the drop opening 62 is protruded downward from the cutout portion 97.

[0075] The grinding section 17 is provided with a loading and unloading operation section 101. Figure 7 and Fig.10As shown in FIG. 1 and FIG. 2 , the loading and unloading operation part 101 is configured as follows: slide blocks 103, 103 are provided in sliding recesses 102, 102 formed on the left and right outer sides of the hopper 86 so as to be movable in the left and right directions. The slide blocks 103, 103 are provided with a locking claw portion 105 having a width greater than that of the sliding plate 104 on the outer sides of the sliding plate 104 formed in the left and right directions, respectively, and the outer edge portion 105A of the locking claw portion 105 is formed obliquely. A plate-shaped longitudinal portion 106 is provided on the upper part of the locking claw portion 105. A horizontal catch portion 107 is provided on the upper part of the longitudinal portion 106 so as to protrude outward. A coil spring 108 as a push means is arranged between the longitudinal portion 106 and the bottom surface of the sliding recess 102, and the slide block 103 is pushed outward by the coil spring 108. Abutment edges 106A, 106A are protrudingly provided on the front and rear edges of the longitudinal portion 106, and the anti-slip edges 102A, 102A abutted by these abutment edges 106A, 106A are formed inwardly at the outer ends of the longitudinal edges on the front and rear sides of the sliding recess 102. That is, the movement range of the slider 103 to the outside is limited to the position where the abutment edge 106A abuts against the anti-slip edge 102A. Fig.10 In the figure, the solid line indicates the state in which the slider 103 is retracted, and the dashed line indicates the state before the catch 107 is pushed. In addition, when the slider 103 is located at the dashed line position, the locking claw 105 of the mounting and dismounting operation unit 101 is locked in the locking hole 119 described below.

[0076] Arms 111, 111 are provided on the left and right sides of the upper side of the storage tube 55 of the grinder housing 51 to protrude outward, and sliding grooves 112 for the sliding plate 104 to slide are formed on the upper surfaces of these arms 111, 111. In addition, outer flanges 113, 113 are provided on the left and right sides of the upper edge of the lower housing body 95 corresponding to the arms 111, 111. The arms 111, 111 are placed in a fitted state on these left and right outer flanges 113, 113. And, by tightening the screws 115 ( Figure 7 ) is inserted into the through hole 114 of the outer flange portion 113, and the screw 115 is fixed to the upper shell 52, thereby integrating the upper and lower shells 52 and 53.

[0077] like Figure 1As shown, the mounting recess 19 has: a substantially U-shaped front recess 116, which is opened on the front and upper surfaces of the housing body 2; and a circular rear recess 117, which is located at the rear side of the front recess 116 and is opened on the upper surface of the housing body 2. The front sides of the upper housing 52 and the lower housing 53 are accommodated in the front recess 116, and the front surface portion 92 is substantially flush with the front surface of the eaves 5 in the accommodated state. On the other hand, the rear sides of the upper housing 52 and the lower housing 53 are accommodated in the rear recess 117, and the upper surface of the upper front cover portion 91 is substantially flush with the upper surface of the eaves 5 in the accommodated state, and the upper opening 85 of the upper housing 52 protrudes from the upper surface of the eaves 5.

[0078] 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. Left and right side surfaces are provided downwardly from the bottom surfaces 118A, 118A of the left and right operating recesses 118, 118, and the locking holes 119, 119 as slit-shaped locking receiving portions for the locking claws 105, 105 as locking portions are formed on the upper portions of the left and right side surfaces.

[0079] Therefore, when the grinding part 17 is inserted into the mounting recess 19 from above, the outer edge 105A of the locking claw 105 abuts against the corner of the bottom surface 118A above the locking hole 119. When the grinding part 17 is pressed downward from here, the slider 103 retreats due to the inclination of the outer edge 105A, and the coil spring 108 contracts. As a result, the locking claw 105 passes through the corner. After the locking claw 105 passes through the corner, the coil spring 108 extends, and the locking claw 105 is locked in the locking hole 119. As a result, the grinding part 17 is fixed to the mounting recess 19.

[0080] On the contrary, when the left and right catch portions 107 , 107 are pushed inward, the locking claw portion 105 is disengaged from the locking hole portion 119 , and the grinding portion 17 can be removed from the mounting recess 19 .

[0081] A driving unit 121 is disposed in the housing body 2. The driving unit 121 has a driving gear 122 meshing with the driven gear 33. Figure 2 and Fig.11As shown, the driving unit 121 has a front bracket 123 and a rear bracket 124. The front bracket 123 and the rear bracket 124 are assembled into one body. In addition, the motor 21 is mounted on the rear bracket 124. And a motor side gear 126 is provided on the rotating shaft of the motor 21. In addition, the front bracket 123 has a front storage portion 127, and the rear bracket 124 has a rear storage portion 128. A reduction gear group 129 is arranged inside these front and rear storage portions 127 and 128.

[0082] The reduction gear group 129 includes a first rotating plate 130 and a second rotating plate 130A. Four shafts 131, 131, 131, 131 are protrudingly provided at the rear of the first rotating plate 130, and reduction gears 132, 132, 132, 132 are rotatably provided on these shafts 131, 131, 131, 131. In addition, the motor side gear 126 meshes with each reduction gear 132, 132, 132, 132 at the center of these reduction gears 132, 132, 132, 132. 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 storage portion 127. In addition, a transmission gear 133 is integrally provided at the center of the front side of the first rotating plate 130. In addition, the second rotating plate 130A is arranged at the front side of the first rotating plate 130. Four shafts 131A, 131A, 131A, 131A are protrudingly provided at the rear of the second rotating plate 130A, and reduction gears 132A, 132A, 132A, 132A are rotatably provided on these shafts 131A, 131A, 131A, 131A. Furthermore, the transmission gear 133 is meshed with each reduction gear 132A, 132A, 132A, 132A at the center of these reduction gears 132A, 132A, 132A, 132A. On the other hand, the outer peripheral sides of these reduction gears 132A, 132A, 132A, 132A are meshed with an internal gear (not shown) formed on the inner surface of the front storage portion 127. In addition, the driving gear 122 is integrally provided at the center of the front side of the second rotating plate 130A. A gear holder 134 is provided at the rear side of the first rotating plate 130 near the rear end of the shaft 131. In addition, the rear end of the shaft 131A of the second rotating plate 130A is close to the front surface of the first rotating plate 130. The gear holder 134 has a disc-shaped front surface portion 134A close to the rear end of the shaft 131 and a cylinder portion 134B integrally provided at the rear of the front surface portion 134A. In addition, a center through hole 134C is formed by passing through the central portion of the front surface portion 134A. In addition, the motor side gear 126 is inserted into the center through hole 134C, and the motor side gear 126 is meshed with the reduction gears 132, 132, 132, 132 at the front side of the front surface portion 134A. In addition, the distance from the shaft 131 of the first rotating plate 130 to the front surface portion 134A of the gear holder 134 is shorter than the axial length of the reduction gear 132. Likewise, the distance from the shaft 131A of the second rotating plate 130A to the front surface of the first rotating plate 130 is also shorter than the axial length of the reduction gear 132A. The motor side gear 126, the reduction gear 132 and the internal gear (not shown) form a reduction mechanism using a planetary gear mechanism.In this part, the motor side gear 126 is a sun gear, and the reduction gear 132 is a planetary gear. Similarly, the transmission gear 133, the reduction gear 132A, and the internal gear (not shown) constitute a reduction mechanism using a planetary gear mechanism. In this part, the transmission gear 133 is a sun gear, and the reduction gear 132A is a planetary gear.

[0083] A front surface portion 135 is integrally provided on the front side of the front storage portion 127 of the front side bracket 123. A cutout tube portion 137 having a side opening 136 is provided on the front surface of the front surface portion 135 and on the right side as one of the left and right sides. In addition, a longitudinal recess 138 having a substantially U-shaped shape in front view is provided on the right side of the cutout tube portion 137.

[0084] In a state where the driving gear 122 is inserted from the rear side into the cut-out cylinder 137, the driving unit 121 is fixed in the housing body 2, and the side of the driving gear 122 is exposed from the side opening 136 to the front side of the front surface 135 of the front bracket 123. In addition, with respect to the longitudinal recess 138, the rear end of the boss portion 46 of the driven gear 33 is movably inserted therein from the upper opening 138A thereof.

[0085] The driving gear 122 and the driven gear 33 are both spur gears, and the axial directions of their respective rotational center axes 122J and 33J are horizontal and parallel. Furthermore, when the grinding unit 17 is mounted on the housing body 2, the rotational center axes 122J and 33J of the driving gear 122 and the driven gear 33 are staggered in the horizontal direction. In addition, the rotational center axes 122J and 33J are preferably arranged at the same height. In this embodiment, as shown in FIG. Fig.14 As shown, in the mounted state, the rotation center axes 122J and 33J are meshed at the same height. In this example, the rotation center axis 33J of the driven gear 33 is the center axis of the rotation shaft 48.

[0086] Thus, as described above, when the grinding unit 17 is mounted on the mounting recess 19 of the housing body 2, the driven gear 33 rotates while meshing with the driving gear 122, so that the driving gear 122 can be reliably meshed with the driven gear 33. Fig.14 As shown in FIG. 1 , the driving gear 122 rotates clockwise so that the meshing side with the driven gear 33 moves downward. As a result, when there is a load, a force is exerted in such a way that the driven gear 33 and even the grinding part 17 are pushed downward. In other words, a force is exerted in the direction opposite to the direction in which the grinding part 17 is separated from the housing body 2.

[0087] like Figure 4As shown, an insertion hole 142 is longitudinally provided in the center of the housing 141 of the hot water supply unit 18, and the drop port 62 is detachably inserted and connected to the insertion hole 142. Furthermore, the drop port 62 is connected to the insertion hole 142 by installing the grinding unit 17 in the installation recess 19. In addition, a baffle 143 is provided at the lower part of the insertion hole 142 to open and close the insertion hole 142.

[0088] The housing 141 is provided with a connection portion 144 to which hot water is delivered from the hot water delivery device 9 via the liquid delivery path 9A. In addition, the housing 141 is provided with a plurality of nozzles 145 for supplying the hot water to the filter cup 8. In addition, a filter paper 146 is replaceably arranged in the filter cup 8. Furthermore, a liquid stop valve 147 is provided at the bottom of the filter cup 8. In addition, reference numeral 10 is a switch operated when the coffee machine 1 is used as a grinding device.

[0089] Hereinafter, the structure of the rotating blade 22 and the fixed blade 24 of the present invention will be described. In addition, in this example, one of the rotating blade 22 and the fixed blade 24, namely the rotating blade 22, has four grooves 153, 153, 153, 153. In addition, the other of the rotating blade 22 and the fixed blade 24, namely the fixed blade 24, has five grooves 153, 153, 153, 153, 153. And, the rotating blade 22 is rotationally driven by the motor 21, and the fixed blade 24 is fixed. In addition, it is also possible to have a reverse structure in which the rotating blade 22 has five grooves 153, 153, 153, 153, 153, and the fixed blade 24 has four grooves 153, 153, 153, 153. In addition, the grooves 153 of the rotating blade 22 and the fixed blade 24 are bent in the same direction from the center to the outside.

[0090] like Figure 15 to Figure 21 As shown, the rotating blade 22 has a disc body 150 as a disc-shaped base and a disc-shaped blade portion 151 which is integrally provided on one side of the disc body 150 and thinner than the disc body 150. On the other hand, the fixed blade 24 has a disc body 150A as a disc-shaped base and a disc-shaped blade portion 151A which is integrally provided on one side of the disc body 150A and thinner than the disc body 150A. In addition, these disc bodies 150, 150A have the circular through hole 152 in the center. In addition, the outer diameter and thickness of the disc bodies 150, 150A are the same, and the outer diameter and thickness of the blade portions 151, 151A are the same.

[0091] On one side of the rotating blade 22, four grooves 153, 153, 153, 153 are rotationally symmetrically arranged at equal intervals of 90 degrees in the circumferential direction. On the other hand, on one side of the fixed blade 24, five grooves 153, 153, 153, 153, 153 are arranged at equal intervals of 72 degrees in the circumferential direction. In addition, compared with the grooves 153 of the disc body 150, the grooves 153 of the disc body 150A are formed to be narrower in width.

[0092] Thus, in the rotating blade 22 and the fixed blade 24, the circumferential spacing of the grooves 153 is different. Specifically, Fig.19 As shown, the angle θ between the adjacent grooves 153, 153 of the rotating blade 22 in the circumferential direction is 90 degrees, and the angle θ between the adjacent grooves 153, 153 of the fixed blade 24 in the circumferential direction is 72 degrees.

[0093] In addition, the number of grooves 153 of the rotating blade 22 and the number of grooves 153 of the fixed blade 24 are set to have a relationship that does not have a common divisor. As this relationship that does not have a common divisor, in this example, as a preferred combination, the number of grooves 153 of the rotating blade 22 is 4 and the number of grooves 153 of the fixed blade 24 is 5. However, in addition to this, the number of grooves 153 of the rotating blade 22 is 5 and the number of grooves 153 of the fixed blade 24 is 6 to 9. Or the number of grooves 153 of the rotating blade 22 is 7 and the number of grooves 153 of the fixed blade 24 is 8 to 13. In addition, the angle θ of the circumferential spacing between adjacent grooves 153, 153 is equal to the angle of the circumferential spacing between adjacent cutting blades 157, 157.

[0094] These multiple grooves 153, 153... are formed so that the closer they are to the outer peripheral side, the more backward they are relative to the direction of relative rotation. The knife portion 151, 151A is composed of a metal plate 151K composed of a plate material of a certain thickness, and is formed into a disc shape with the same diameter as the disc body 150, 150A. In addition, both surfaces of the knife portion 151, 151A are formed as flat surfaces. In addition, the knife portion 151, 151A is provided with a central through hole 152H and 4 or 5 groove openings 155, 155... formed in an arc shape from the through hole 152H to the outside. In addition, the hole portion is formed by these through holes 152H and the groove openings 155, 155... The knife portion 151, 151A is formed in a disc shape by punching out a metal plate 151K that serves as a base material by pressing or the like, and forms the through hole 152H and four or five groove openings 155, 155... In addition, the through hole 152H corresponds to the through hole 152. In addition, the groove openings 155, 155... correspond to the groove portions 153, 153... That is, the through hole 152H and the through hole 152 have approximately the same diameter. In addition, the groove opening 155 has the same shape as the groove portion 153 on one side of the disc body 150, 150A, and constitutes a part of the groove portion 153. In addition, the knife portion 151, 151A has a higher hardness than the disc body 150, 150A, and is formed of a metal such as stainless steel or titanium that has rust resistance. In addition, in this example, stainless steel is used. On the other hand, the disk bodies 150 and 150A are formed of synthetic resins such as engineering plastics or rust-resistant metals such as aluminum alloys. That is, the disk bodies 150 and 150A can be easily and inexpensively manufactured by molding such as injection molding or die casting. In addition, in this example, engineering plastics such as POM (Polyformaldehyde) or PBT (Polybutyleneterephthalate) with oil resistance are used.

[0095] exist Fig.17 , the direction indicated by the hollow arrow is the rotation direction of the rotating blade 22. The slot openings 155, 155, ... have a front curved edge 156 on the front side of the rotation direction, and have a cutting blade 157 composed of a rear curved edge on the rear side of the rotation direction. These front curved edges 156 and cutting blades 157 are formed on the edges of the blade portions 151, 151A. And, in the assembled state, the front curved edge 156 and the cutting blade 157 are arranged along the portion of the slot 153 of the disc body 150, 150A.

[0096] In addition, when viewed from the front, each of the front curved edge portions 156 and the cutting blade 157 is curved in a convex manner with the front side in the rotation direction being convex. That is, the slot opening portions 155, 155, ... are curved from the arc inner edge portion 170 of the through hole 152 as the inner end side toward the curved intersection portion 158 on the outer end side toward the rear side in the rotation direction. In addition, the front curved edge portion 156 and the cutting blade 157 are both arc-shaped, and the curvature radius of the cutting blade 157 is only slightly smaller than that of the front curved edge portion 156. Furthermore, the outer end of the front curved edge portion 156 and the outer end of the cutting blade 157 intersect at the intersection portion 158 near the outer periphery of the disc body 150. In addition, the inner end of the cutting blade 157 intersects with the arc inner edge portion 170 at the inner intersection portion 159. On the other hand, the inner end of the front curved edge portion 156 intersects with the arc inner edge portion 170 at the inner intersection portion 159A.

[0097] In addition, if Fig.19 As shown, regarding the knife portions 151, 151A, the diameters of the circumscribed circles 156G of the plurality of front side curved edges 156, 156..., the shapes of the cutting knife 157 and the arc inner edge portion 170 are the same, and the front side curved edges 156 of the five grooves 153 in the knife portion 151A are formed to be shorter than the front side curved edges 156 of the four grooves 153 in the knife portion 151.

[0098] A connecting portion 165 is provided between the intersection portion 158 and the outer peripheral surface 151G of the blade portion 151, 151A. That is, the outer end of the front curved edge portion 156 and the outer end of the cutting blade 157 do not reach the outer peripheral surface 151G. In this way, by providing the connecting portion 165 on the blade portion 151, 151A, even if the rotating blade 22 is relatively tilted relative to the fixed blade 24 when the beverage raw material is crushed, the connecting portions 165 will contact each other. Therefore, it is possible to prevent the cutting blade 157 of the rotating blade 22 from contacting with the cutting blade 157 of the fixed blade 24 and causing damage.

[0099] On one side of the disk body 150, 150A, the groove 153 has a front curved edge 156K and a rear curved edge 157K of the same shape as the front curved edge 156 and the cutting blade 157. That is, the grooves 153, 153, ... are curved toward the rear side in the rotation direction from the arc inner surface 170K of the through hole 152 as the inner end side toward the intersection 158K on the outer end side in the disk body 150, 150A. In addition, the outer ends of the front curved edge 156K and the rear curved edge 157K are connected by the intersection 158K.

[0100] The lowest part of the groove portion 153, i.e., the bottom 160, is a side edge of the through hole 152. In addition, the groove portion 153 has a front groove inner surface portion 161 formed from the front curved edge portion 156K in the depth direction and a rear groove inner surface portion 162 formed from the rear curved edge portion 157K in the depth direction in the disc body 150, 150A. And, these front groove inner surface portions 161 and rear groove inner surface portions 162 intersect at a bottom edge portion 163 on the bottom side. The bottom edge portion 163 is formed from the rear end 160A in the rotation direction of the bottom 160 to the intersection portion 158K. And, the bottom edge portion 163 is curved when viewed from above. In addition, the bottom edge portion 163 is formed in an inclined manner so as to become higher from the rear end 160A of the bottom 160 toward the intersection portion 158K. In addition, the top view in this case is like Fig.17 and Fig.18 Observe the situation like that.

[0101] In addition, the rear groove inner surface portion 162 is formed to stand up approximately vertically. That is, the rear groove inner surface portion 162 is curved in the same shape as the cutting blade 157 when viewed from above. And the bottom edge portion 163 is located 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 rotation direction is the bottom edge portion 163, and the inner end of the front groove inner surface portion 161 is the bottom 160.

[0102] like Fig.15 As shown in the figures, the front groove inner surface portion 161 of the groove portion 153, 153, ... is inclined in a manner that becomes higher from the bottom edge portion 163 toward the front curved edge portion 156K in the rotation direction (circumferential direction) of the disk body 150, 150A. And, in the front curved edge portion 156K, the front groove inner surface portion 161 is at the same height as the flat surface portion 164 on one side of the disk body 150, 150A. And, the groove portion 153 and the groove opening portion 155 are formed so that the width becomes narrower from the central side to the outer peripheral side. In addition, the groove portion 153 is formed so that it becomes shallower from the central side to the outer peripheral side.

[0103] Furthermore, the rear groove inner surface portion 162 is preferably vertical, but as a demolding slope of the mold, it can also be made to tilt very slightly toward the rear side of the rotation direction as it approaches the top of the rear groove inner surface portion 162. The inclination angle of the rear groove inner surface portion 162 is less than 1 degree based on the vertical, and in this example, it is 0.5 degrees. In addition, the height of the rear groove inner surface portion 162 is the depth of the groove portions 153, 153... In addition, the groove introduction portion 153A, 153A... is formed by the central side of the disc body 150 of the groove portions 153, 153... And the groove introduction portion 153A is provided continuously with the through hole 152.

[0104] In addition, the inner end of the rear groove inner surface portion 162 intersects with the arc inner surface portion 170K at the inner longitudinal edge portion 159K. On the other hand, the inner end of the front groove inner surface portion 161 intersects with the arc inner surface portion 170K at the inner intersection portion 159B and the bottom portion 160. In addition, the inner longitudinal 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.

[0105] The disc body 150 of the rotating knife 22 is provided with a fixing structure for fixing the knife portion 151. The fixing structure has a plurality of (four in this example) reserved holes 171 formed on one side of the disc body 150 and a plurality of (two in this example) positioning protrusions 172 protruding from one side of the disc body 150. In addition, the reserved holes 171 are provided between the groove portions 153 adjacent to each other in the rotation direction. In addition, the positioning protrusions 172 are provided adjacent to a part of these reserved holes 171 at the rear side in the rotation direction. The reserved holes 171 are provided at equal intervals (90 degrees in this example) in the circumferential direction. Similarly, the positioning protrusions 172 are also provided at equal intervals (180 degrees in this example) in the circumferential direction. On the other hand, a tapered hole 173 corresponding to the reserved hole 171 and a positioning hole portion 174 corresponding to the positioning protrusion 172 are provided through the knife portion 151. Furthermore, the tapered hole portion 171A is formed in the upper portion of the reserved hole 171 in such a manner that the conical surface of the tapered hole 173 is extended. In addition, the positioning protrusion 172 is inserted into the positioning hole portion 174. The positioning protrusion 172 and the positioning hole portion 174 constitute a positioning device. In addition, the diameter of the tapered hole 173 is larger than that of the positioning protrusion 172. Therefore, even if the positioning protrusion 172 is inserted into the tapered hole 173 by mistake, the position is not fixed.

[0106] In addition, the disc body 150A of the fixed knife 24 is provided with a fixing structure for fixing the knife portion 151A. The fixing structure has a plurality of (five in this example) reserved holes 171 formed on one side of the disc body 150A. And, the reserved holes 171 are provided between the groove portions 153 adjacent to each other in the rotation direction. The reserved holes 171 are provided in the circumferential direction at equal intervals (72 degree intervals in this example). On the other hand, a tapered hole 173 corresponding to the reserved hole 171 is provided through the knife portion 151A. And, in the upper part of the reserved hole 171, the tapered hole portion 171A is formed in a manner that the conical surface of the tapered hole 173 is extended. In addition, the positioning protrusion 172 is not provided on the disc body 150A, and the positioning hole portion 174 is not provided on the knife portion 151A.

[0107] like Fig. 20 As shown, the knife portion 151 is positioned on the disc body 150 by inserting the positioning protrusion 172 into the positioning hole portion 174. And, the knife portion 151, 151A is fixed to the disc body 150, 150A by screwing the flat head screw 175 inserted into the tapered hole 173 into the reserved hole 171. In this fixed state, the head 175A of the flat head screw 175 is accommodated in the tapered hole 173, and therefore, does not protrude from one side of the knife portion 151, 151A. In addition, the height of the positioning protrusion 172 of the disc body 150 is less than the thickness of the knife portion 151. Therefore, the positioning protrusion 172 does not protrude from one side of the knife portion 151 when it is inserted into the positioning hole portion 174. In addition, the flat head screw 175 is a fixing device. Furthermore, the flat head screw 175 is made of a rust-resistant metal (stainless steel in this example). In addition, the reserved hole 171 may be a simple cylindrical hole, or an internal thread may be formed on the inner surface of the cylindrical hole. However, in this example, the disc body 150, 150A is formed of POM or PBT, etc., so it is not realistic to form an internal thread. Therefore, in this example, the reserved hole 171 is set as a simple cylindrical hole, and the flat head screw 175 is set as a self-tapping screw.

[0108] like Figure 6 , Figure 7 and Fig.21 As shown in FIG. 1 , a hollow portion 181 is provided on the other side of the disc body 150, 150A. Fig.21As shown, by providing an outer peripheral cylinder portion 182 around the plate-shaped plane portion 164, providing a central cylinder portion 184 in the center of the plane portion 164, and further forming four curved plate-shaped groove forming portions 185 in the disk body 150, the hollow portion 181 recessed on the other side is formed. On the other hand, by forming five curved plate-shaped groove forming portions 185 in the disk body 150A, the hollow portion 181 recessed on the other side is formed. The outer peripheral surface 150G is formed in the outer peripheral cylinder portion 182. In addition, the central cylinder portion 184 is formed in the center of the plane portion 164. And, the arc inner surface portion 170K ( Fig.16 ). Furthermore, the groove portion 153 is formed in the groove forming portion 185. Also, the mounting boss 183 is formed to protrude from the other side of the plane portion 164. In addition, four mounting bosses 183 are provided on the disc body 150, and five mounting bosses 183 are provided on the disc body 150A. The reserved hole 171 for mounting the knife portion 151 is formed in the mounting boss 183. In addition, the mounting boss 183 is protruded from the other flat side of the plane portion 164.

[0109] In addition, on the other side of the disk body 150, a plurality of mounting bosses 186 as mounting parts for grinding knives are protrudingly provided near the plurality of mounting bosses 183. On the other hand, on the other side of the disk body 150A, a plurality of mounting bosses 186 as mounting parts for grinding knives are also protrudingly provided near the plurality of mounting bosses 183. Furthermore, the mounting bosses 183 and the mounting bosses 186 are respectively roughly cylindrical in shape. Moreover, with respect to the adjacent mounting bosses 183 and the mounting bosses 186, their parts are integrally formed. In addition, the screws 38 ( Figure 8 )、70( Fig. 9 ) is made of a rust-resistant metal (stainless steel in this example). In addition, the reserved hole 186A can be a simple cylindrical hole, or an internal thread can be formed on the inner surface of the cylindrical hole. However, in this example, the disc body 150 is formed of POM or PBT, so it is not realistic to form an internal thread. Therefore, in this example, the reserved hole 186A is set as a simple cylindrical hole, and the screws 38 and 70 are set as self-tapping screws.

[0110] Next, the manufacturing steps of the rotating blade 22 and the fixed blade 24 are described. First, the manufacturing steps of the blade parts 151 and 151A are described. These blade parts 151 and 151A are formed by pressing a stainless steel plate of a certain thickness and performing punching. Through this pressing process, the stainless steel plate is punched into a disc-shaped blade part 151 and 151A. At the same time, the through hole 152H, the groove opening part 155, the tapered hole 173 and the positioning hole part 174 are formed in these blade parts 151 and 151A. In addition, the tapered hole 173 is a simple through hole at this stage. In this way, when the metal plate 151K is punched from the upper surface side using a male die, the edge of the upper surface side of the metal plate 151K is formed into a roughly R shape due to plastic deformation. On the other hand, burrs are generated at the edge of the lower surface side of the metal plate 151K in a manner protruding downward. Then, the burrs are removed by cutting in such a manner that the lower surface side of the metal plate 151K becomes flat. By removing the burrs in this manner, a substantially right-angled and sharp edge constituting the cutting knife 157 is formed at the groove opening 155. Then, by arranging the lower surface of the metal plate 151K on one side, a sharp cutting knife 157 can be provided on one side of the rotating knife 22 and the fixed knife 24. In addition, the tapered hole 173 is rounded after pressing. In this way, the knife portion 151 having the cutting knife 157 can be manufactured cheaply and easily by utilizing a hole opening process by pressing and subsequent simple burr removal. In addition, by using stainless steel in the knife portions 151 and 151A, rust will not occur and the knife portions 151 and 151A are suitable for water washing and the like.

[0111] In addition, when the disk body 150, 150A is made of engineering plastics such as POM or PBT, that is, synthetic resin, it is formed by injection molding or other molding. On the other hand, when it is made of rust-resistant metal such as aluminum alloy, it is formed by casting using a mold such as die casting or shell casting. In this way, by forming the disk body 150, 150A from synthetic resin or rust-resistant metal, it will not rust and is suitable for water washing.

[0112] Then, as described above, the blades 151 and 151A are fixed and integrated with the disk bodies 150 and 150A by the flat head screws 175. Furthermore, since the flat head screws 175 are made of stainless steel, they are not rusted and are suitable for water washing and the like.

[0113] In this way, the rotating knife 22 and the fixed knife 24 only use hard materials in the knife parts 151 and 151A, and use easy-to-form and cheap synthetic resins and other materials in the disc bodies 150 and 150A serving as the supports of these knife parts 151 and 151A. Therefore, it is easy to form and the overall price is relatively low.

[0114] Next, an example of the method of using the coffee machine 1 is described. First, the user horizontally pulls out the filter cup 8 from the bottom of the eaves 5, places the filter paper 146 in the filter cup 8, and then pushes the filter cup 8 horizontally to the bottom of the eaves 5. Then, the beverage container 13 is placed on the heating plate 11 of the placement part 4. In addition, when the beverage container 13 is placed on the heating plate 11, the curved surface convex portion 16A provided on the cover 16 of the beverage container 13 abuts against the liquid stop valve 147, thereby pushing up the liquid stop valve 147 to open it. Then, an amount of water corresponding to the number of cups of coffee liquid to be extracted is placed in the water storage part 6. Furthermore, the cover 89 of the grinding part 17 is removed, and a specified amount of coffee beans is placed in the hopper 86 from the upper opening 85 serving as the inlet. In addition, at this stage, the baffle 143 covers the drop opening 62 , and the grinding portion 17 is not connected to the filter cup 8 .

[0115] Then, when the user operates the switch 10, four actions are performed simultaneously. The first action is that the baffle advancing and retracting device (not shown) moves the baffle 143 in the direction of the opening of the drop port 62. As a result, the drop port 62 is opened, and the grinding section 17 is connected to the filter cup 8. The second action is to operate the grinding device 20. As a result, coffee beans are ground by the grinding device 20 to obtain coffee powder, which falls from the drop port 62 and is supplied to the filter paper 146 of the filter cup 8. The third action is to start energizing the heating device 7. As a result, the water in the water storage section 6 is heated to become hot water. Furthermore, the fourth action is to start energizing the heater 12. As a result, the beverage container 13 placed on the heating plate 11 is heated.

[0116] In the grinding device 20, the dial 72 is operated to adjust the preferred particle size before coffee beans are put in. Then, when the motor 21 is actuated to operate the grinding device 20, the rotation of the motor 21 is decelerated by the reduction gear group 129 and transmitted to the driving gear 122, thereby rotating the driven gear 33 meshing with the driving gear 122.

[0117] In this case, if Fig.14 As shown, the driving gear 122 rotates in such a manner that the meshing side with the driven gear 33 moves downward. As a result, when there is a load, a force is exerted in such a manner that the driven gear 33 and even the grinding part 17 are pushed downward. That is, a force is exerted in the direction opposite to the direction in which the grinding part 17 is separated from the housing body 2, so that the grinding part 17 can be driven stably.

[0118] Coffee beans fall from the lower openings 87, 87 of the hopper 86 into the chute 88 and are sent to the storage cylinder 55 by the rotating grinder screw 35. Then, in the storage cylinder 55, the coffee beans are crushed by the fixed blade 24 and the rotating rotary blade 22.

[0119] Specifically, the coffee beans are fed into the slot introduction parts 153A, 153A, ... of the rotating knife 22 and the fixed knife 24 from the through hole 152 of the rotating knife 22 by the rotating screw 35. Then, the fed coffee beans are crushed by the cutting knives 157, 157, ... of the opposing knife parts 151, 151A due to the rotating motion of the rotating knife 22. That is, the coffee beans fed into the slot introduction parts 153A, 153A, ... are first sheared by the cutting knives 157. At this time, the coffee beans are not cut into two halves, but are roughly crushed. The coffee beans roughly crushed by the cutting knives 157 are fed to the slot parts 153 that are further back than the cutting knives 157 in the rotation direction. Then, the groove 153 of the rotating blade 22 and the groove 153 of the fixed blade 24 work together to send the crushed coffee beans to the centrifugal direction of the rotating blade 22 and the fixed blade 24, and the cutting blades 157, 157, 157, 157 of the rotating blade 22 and the cutting blades 157, 157, 157, 157, 157 of the fixed blade 24 work together to further shear the crushed coffee beans and grind them finely. Then, the coffee beans crushed by the cutting blades 157, 157, ... are further sent to the grooves 153, 153, ... on the rear side of the rotation direction, and are also sent to the centrifugal direction in these grooves 153, 153, ... and further grind them finely. By repeating this movement and grinding of the coffee beans, the coffee beans are finely ground and discharged from the outer periphery of the rotating blade 22 and the fixed blade 24.

[0120] In this case, the rotating blade 22 is provided with four grooves 153, 153, 153, 153 at equal intervals in the circumferential direction, and the fixed blade 24 is provided with five grooves 153, 153, 153, 153, 153 at equal intervals in the circumferential direction. The angle θ of the circumferential interval of the grooves 153, 153 of the rotating blade 22 is 90 degrees, while the angle θ of the circumferential interval of the grooves 153, 153 of the fixed blade 24 is 72 degrees. Due to the different angles, coffee beans will not enter the grooves 153, 153 of the rotating blade 22 and the fixed blade 24 at the same time and be crushed at the same time, and the coffee beans can be crushed at different times to reduce the instantaneous load applied to the rotating blade 22 and the fixed blade 24, thereby reducing the vibration and noise of the grinding device 20. Specifically, during one rotation of the rotating blade 22, the coffee beans are crushed 20 times between the rotating blade 22 and the fixed blade 24 at equal intervals of 18 degrees. Furthermore, since the coffee beans are not ground at two or more locations at the same time, the load generated by one grinding is low. That is, small loads are generated evenly multiple times, so the vibration and noise of the grinding device 20 can be reduced.

[0121] In addition, compared with the case where the grooves 153 of the rotating blade 22 and the fixed blade 24 are equally spaced in the circumferential direction and the number of grooves 153 is the same, the case where the grooves 153 of the rotating blade 22 and the fixed blade 24 are equally spaced in the circumferential direction and the number of grooves 153 is different can further reduce the vibration and noise of the grinding device 20.

[0122] In addition, in the present embodiment, the number of grooves 153 of the rotating blade 22 and the fixed blade 24 is set to a number that does not have a common divisor, but this does not exclude numbers other than combinations of such numbers. For example, when the grooves 153 of the rotating blade 22 and the fixed blade 24 are set at equal intervals in the circumferential direction, the coffee beans enter and are crushed at the same time through the six groups of grooves 153, so vibration or noise is generated. On the other hand, when the grooves 153 of the rotating blade 22 are set at equal intervals in the circumferential direction to six, and the grooves 153 of the fixed blade 24 are set at equal intervals in the circumferential direction to four, there is a common divisor "2". In this case, although the coffee beans enter and are crushed at the same time in two groups of grooves 153 of the rotating blade 22 and the fixed blade 24, the noise or vibration can be reduced compared to the case where the coffee beans enter and are crushed at the same time in six groups of grooves 153 of the rotating blade 22 or four groups of grooves 153 of the fixed blade 24.

[0123] Furthermore, when the grooves 153 of the rotating blade 22 and the fixed blade 24 are equally spaced in the circumferential direction, and the number of grooves 153 of one of the rotating blade 22 and the fixed blade 24 is 6 and the number of grooves 153 of the other is 5, the coffee beans will not enter the multiple groups of grooves 153 of the rotating blade 22 and the fixed blade 24 at the same time and be crushed at the same time. Specifically, during one rotation of the rotating blade 22, the coffee beans are crushed 30 times at equal intervals of 12 degrees between the rotating blade 22 and the fixed blade 24. In addition, the coffee beans are not crushed at more than two places at the same time, so the load generated by one crushing is low. Therefore, the vibration and noise of the grinding device 20 can be reduced. In this way, when the grooves 153 of the rotating blade 22 and the fixed blade 24 are equally spaced in the circumferential direction, and the difference in the number of grooves 153 of the rotating blade 22 and the fixed blade 24 is 1, the vibration and noise of the grinding device 20 can be effectively reduced while ensuring the crushing effect.

[0124] In addition, the blade 151 has a groove group 154, which is composed of a plurality of grooves 153, 153, ... formed to be thinner and shallower as they approach the outer peripheral side. Therefore, the coffee beans sent to the groove introduction part 153A are ground in a manner that gradually becomes thinner according to the depth change of each groove 153, 153, ... Therefore, the coffee beans are not ground very finely all at once, and even the motor 21 with a small output can grind the coffee beans efficiently. Furthermore, even the motor 21 with a small output can grind the coffee beans well at a low speed using the reduction mechanism, so the temperature of the coffee beans hardly rises when ground. Therefore, it is not easy to destroy the flavor of the coffee beans.

[0125] Furthermore, on one side of the rotating blade 22, the slot opening 155 and the through hole 152H are formed in the same shape, and the blade portion 151 is formed rotationally symmetrically, and on one side of the fixed blade 24, the slot opening 155 and the through hole 152H are formed in the same shape, and the blade portion 151A is formed bilaterally symmetrically. Therefore, by combining the rotating blade 22 and the fixed blade 24 and crushing the coffee beans between them, the coffee beans are crushed at positions symmetrically with the rotating shaft 48 as the center. Therefore, the load when crushing the coffee beans can be made substantially uniform, and the coffee beans can be crushed well.

[0126] Furthermore, when sufficient time has passed to grind all the designated amount of coffee beans, the grinding device 20 stops.

[0127] Then, when the operation of the grinding device 20 stops, the baffle plate advancing and retracting device (not shown) moves the baffle plate 143, thereby the baffle plate 143 covers the drop opening 62. Then, after the baffle plate 143 covers the drop opening 62, the water in the water storage part 6 is made hot water of a specified temperature (85°C to 90°C) by the heating device 7. When the temperature sensor (not shown) detects that the hot water in the water storage part 6 reaches the specified temperature, the power supply to the heating device 7 is stopped, and the hot water in the water storage part 6 is sent to the hot water supply part 18 through the liquid delivery path 9A by the hot water delivery device 9, so that the hot water is sprayed obliquely downward from the plurality of nozzles 145. After the hot water supply by spraying is continuously performed for a specified time, for example, 8 seconds, the hot water supply is stopped for a specified steaming time, that is, 20 seconds, during which the coffee powder is steamed.

[0128] After the steaming time, all the hot water in the water storage part 6 is continuously supplied. In addition, as described above, the amount of water in the water storage part 6 is an amount corresponding to the number of cups of coffee liquid to be extracted, so as long as all the hot water in the water storage part 6 is supplied to the filter cup 8, the specified number of cups of coffee liquid can be obtained, and the water storage part 6 becomes empty.

[0129] The coffee liquid extracted from the filter cup 8 passes through the liquid stop valve 147 and then accumulates in the beverage container 13 through the through hole of the cover body 16. Then, when the beverage container 13 is removed from the mounting portion 4, the liquid stop valve 147 is pressed down and closed by a spring-like push device (not shown) such as a coil spring, thereby preventing the coffee liquid from dripping from the filter cup 8.

[0130] After use, when cleaning the grinding device 20, the locking claw portion 105 is removed from the locking hole portion 119 by holding the locking portions 107, 107 of the sliders 103, 103 in a manner of narrowing the interval therebetween, and the grinding portion 17 is lifted and removed from the mounting recess 19. After the grinding portion 17 is removed, the cover member 32 of the rotating blade mounting portion 23 is rotated to release the screwing engagement with the grinder housing 51 of the fixed blade mounting portion 25, and the rotating blade mounting portion 23 is removed by pulling it out from the fixed blade mounting portion 25.

[0131] In this way, by decomposing the grinding part 17 into the fixed blade mounting part 25 and the rotating blade mounting part 23, as shown in FIG. Fig.12 and Fig.13As shown, the fixed knife 24 and the rotating knife 22 are exposed. Thus, the coffee powder remaining in the rotating knife 22 and the rotating knife mounting portion 23 or the coffee powder remaining inside the fixed knife 24 and the fixed knife mounting portion 25 can be easily removed. In addition, as described above, the knife portion 151, 151A and the flat head screw 175 are made of rust-resistant stainless steel, and the disc body 150, 150A is also made of rust-resistant synthetic resin and other materials. Therefore, the rotating knife 22 and the fixed knife 24 can be cleaned by washing with water. Furthermore, as described above, the screws 38, 70 for fixing the rotating knife 22 and the fixed knife 24 are also made of rust-resistant stainless steel. Therefore, the rotating knife mounting portion 23 and the fixed knife mounting portion 25, that is, the grinding portion 17 can be cleaned by washing with water.

[0132] After cleaning the grinding part 17, the grinder screw 35 can be inserted into the fixed knife mounting part 25, the front end of the rotating shaft 48 can be inserted into the bearing part 61, and the internal threaded portion 45A of the cover part 32 can be screwed into the external threaded portion 55A of the storage cylinder part 55 to assemble the grinding part 17. Therefore, assembly is also easier.

[0133] After assembling the grinding part 17, when the grinding part 17 is inserted into the mounting recess 19 from above, the outer edge portion 105A of the locking claw portion 105 abuts against the corner of the bottom surface portion 118A. When the grinding part 17 is pressed downward from here, the disc spring 108 contracts, and the locking claw portion 105 passes through the corner of the bottom surface portion 118A and is locked in the locking hole portion 119. In this way, the grinding part 17 can be installed in the mounting recess 19. In this way, when the grinding part 17 is installed in the mounting recess 19, the descending driven gear 33 rotates while meshing with the driving gear 122 in the mounting recess 19, so that the driving gear 122 can be reliably meshed with the driven gear 33. In addition, Fig.14 In the embodiment, the driven gear 33 rotates counterclockwise while meshing with the driving gear 122. Furthermore, when the grinding unit 17 is mounted on the mounting recess 19, the rotation center axes 122J and 33J of the driving gear 122 and the driven gear 33 are offset in the horizontal direction and arranged at the same height.

[0134] As described above, the grinding device 20 of this embodiment comprises: a fixed knife 24, which is provided with a knife portion 151A having a plurality of grooves 153, 153, ...; and a rotating knife 22, which is provided with a knife portion 151 having a plurality of grooves 153, 153, ...; when the knife portions 151A, 151 of these fixed knives 24 and rotating knives 22 are facing each other, the rotating knife 22 rotates relative to the fixed knife 24, wherein the circumferential spacing of the grooves 153 of the fixed knife 24 is different from the circumferential spacing of the grooves 153 of the rotating knife 22, and therefore, the crushing time of the coffee beans can be staggered and the instantaneous load applied to the fixed knife 24 and the rotating knife 22 can be reduced, thereby reducing the vibration and noise of the grinding device 20.

[0135] Furthermore, the grooves 153 of the fixed blade 24 are formed at equal intervals in the circumferential direction, and the grooves 153 of the rotating blade 22 are formed at equal intervals in the circumferential direction, and the number of the grooves 153 formed in the fixed blade 24 is different from the number of the grooves 153 formed in the rotating blade 22. Therefore, by making the number of the grooves 153 formed in the fixed blade 24 5 and the number of the grooves 153 formed in the rotating blade 22 4 different, the coffee beans are crushed at equal intervals, thereby further reducing the vibration and noise of the grinding device 20.

[0136] In addition, the number of grooves 153 formed in the fixed blade 24 and the number of grooves 153 formed in the rotating blade 22 are set to have no common divisor relationship, so there is no moment when the coffee beans are crushed at multiple locations at the same time. Therefore, the instantaneous load applied to the fixed blade 24 and the rotating blade 22 can be further reduced, and the vibration and noise of the grinding device 20 can be further reduced.

[0137] Below, as an effect of an embodiment, when there are more than three grooves 153 of the rotating blade 22 and the fixed blade 24, and the grooves 153 of the rotating blade 22 and the fixed blade 24 are equally spaced in the circumferential direction and the difference in the number of grooves 153 between the rotating blade 22 and the fixed blade 24 is 1, the vibration and noise of the grinding device 20 can be effectively reduced.

[0138] In addition, as an effect in the embodiment, there is a disc body 150, 150A as a disc-shaped base and a disc-shaped knife portion 151, 151A integrated on one side of the disc body 150, 150A, the disc body 150, 150A has a groove group 154, the groove group 154 ​​includes a plurality of grooves 153, 153... formed to be thinner and shallower as they approach the outer peripheral side, the knife portion 151, 151A has a front side curved edge 156 and a cutting knife 157 formed along the groove 153 as an edge, and the knife portion 151, 151A is made of a material with a higher hardness than the material constituting the disc body 150, 150A, only the knife portion 151, 151A can be made of a hard material, and the disc body 150, 150A can be made of a material that is easy to process, so it can be constructed inexpensively.

[0139] Furthermore, the blades 151 and 151A are formed of a perforated metal plate having a through hole 152H and a slot opening 155 as a hole portion, and the front side curved edge 156 and the cutting blade 157 as an edge portion of the blades 151 and 151A are formed on the slot opening 155 as a hole portion of the metal plate 151K, so that the blades 151 and 151A can be easily and inexpensively manufactured by, for example, press working. In addition, the cutting blade 157 as an edge portion of the blades 151 and 151A is formed by press working on the edge of the surface on the side where burrs are generated on the metal plate 151K, so that the cutting blade 157 can be sharpened by simply removing the burrs, thereby improving the crushing performance of the grinding blade.

[0140] In addition, the knife parts 151 and 151A are made of a rust-proof metal plate 151K, so that the rotating knife 22 and the fixed knife 24 can be cleaned with water. In addition, the knife parts 151 and 151A are made of stainless steel, so that not only the rotating knife 22 and the fixed knife 24 can be cleaned with water, but also the grinding knife can be manufactured cheaply.

[0141] In addition, the disc body 150, 150A as the base is made of a material that is rust-resistant and can be molded, so that the disc body 150, 150A can be manufactured cheaply by, for example, injection molding or casting molding, and the grinding blade can be cleaned with water. In addition, the disc body 150, 150A as the base is made of a synthetic resin, so that the disc body 150 can be manufactured cheaply and the grinding blade can be cleaned with water.

[0142] In addition, the cutting blades 157, 157 ... and the grooves 153, 153 ... are formed to bend from the center side of the disk body 150, 150A to the outer peripheral side so as to be backward relative to the rotation direction, so that the ground coffee powder is smoothly discharged to the outer peripheral surface 150G side. In addition, the groove introduction parts 153A, 153A ... are substantially entirely connected to the through hole 152 except for the arc inner surface part 170K, so that the coffee beans sent from the through hole 152 to the groove introduction part 153A are guided to the cutting blade 157 by the groove 153, and after being roughly ground by the cutting blade 157, the cutting blade 157 at the rear side in the rotation direction gradually grinds the coffee beans into a desired particle size.

[0143] In addition, the knife portion 151 is fixed to the disc body 150, 150A by the flat head screw 175 as a screw fixing device, so that one of the knife portion 151, 151A and the disc body 150, 150A can be replaced. Furthermore, the hollow portion 181 is formed on the other side of the disc body 150, 150A, so that the material cost of the disc body 150, 150A can be reduced and the weight can be reduced. In addition, the groove introduction portion 153A, 153A...except for the arc inner surface portion 170K, is substantially entirely connected to the through hole 152, so that coffee beans sent from the through hole 152 can be smoothly guided into the groove portion 153. Furthermore, since the positioning device composed of the positioning protrusion 172 and the positioning hole 174 is provided, the assembly operation of the knife portion 151, 151A and the disk body 150, 150A can be easily and reliably performed. In addition, in the installed state, the upper surface of the head 175A of the flat head screw 175 and the upper surface of the positioning protrusion 172 are stored below the side surface of the knife portion 151, 151A, so the head 175A of the flat head screw 175 and the positioning protrusion 172 do not interfere with the other knife portion 151. Furthermore, the head 175A of the flat head screw 175 is locked in the tapered hole 171A of the disk body 150, 150A and the tapered hole 173 of the knife portion 151, so the positioning effect of the disk body 150, 150A and the knife portion 151, 151A can be obtained. In addition, the arc inner surface portion 170K as a partition portion that partitions adjacent groove portions 153, 153 is continuously and substantially vertically provided longitudinally in the through hole 152, so that coffee beans and the like can be substantially evenly supplied to the plurality of groove portions 153. Furthermore, the adjacent mounting bosses 183 and a portion of the mounting bosses 186 are integrally formed, so that the mounting strength of the blade portion 151, 151A to the disc body 150, 150A and the mounting strength of the grinding blade itself can be improved. In addition, the processing method of the cutting knife 157 is to punch out the hole portion serving as the through hole 152H and the groove opening portion 155 on the metal plate 151K made of stainless steel and having a certain thickness through pressing, and cut the burrs protruding on the lower surface side of the edge of the hole portion to form a right-angle edge constituting the cutting knife 157. Therefore, by configuring the lower surface of the metal plate 151K on a side surface, the sharp cutting knife 157 can be set on one side surface of the grinding knife, and the cutting knife 157 can be made sharp by simply removing the burrs, thereby improving the crushing performance of the grinding knife.

[0144] In addition, the grinding device 20 includes a housing body 2 as a main body, a grinding part 17 disposed on the upper part of the housing body 2 and grinding and discharging coffee beans as a beverage raw material, and a motor 21 disposed on the housing body 2 and used to operate the grinding part 17, wherein the grinding part 17 is detachably mounted on the housing body 2, and the grinding part 17 includes a driven gear 33 as a driven side transmission mechanism, a disc-shaped rotating knife 22 connected to the driven gear 33 and detachably mounted on the grinding part 17, and a rotating knife 22 disposed opposite to the rotating knife 22 and fixed to the housing body 2. The grinding portion 17 has a disc-shaped fixed knife 24, and has a driving gear 122 as a driving side transmission mechanism in the shell body 2. The driving gear 122 is rotated by the motor 21 and is detachably connected to the driven gear 33. Therefore, by removing the grinding portion 17 as a whole from the shell body 2 and then removing the rotating knife 22 from the grinding portion 17 together with the driven gear 33, not only can the rotating knife 22 be easily repaired, but the fixed knife 24 can also be easily repaired by holding the grinding portion 17.

[0145] Furthermore, since the driving side transmission mechanism is the driving gear 122 and the driven side transmission mechanism is the driven gear 33 , the degree of freedom of the structure of attaching and detaching the grinding section 17 to the housing body 2 can be increased.

[0146] In addition, the rotation center axis 122J of the driving gear 122 is arranged horizontally, and the grinding part 17 can be loaded and unloaded from the upper side intersecting with the rotation center axis 122J relative to the shell body 2, and is not detached in parallel with the direction of the rotation center axis 122J. Therefore, not only can the grinding part 17 be easily loaded and unloaded relative to the shell body 2, but the gears 33 and 122 can also be easily meshed with each other.

[0147] In addition, since the grinder screw 35 is provided in the rotating blade mounting portion 23, the grinder screw 35 can be easily pulled out from the guide wall portion 58 by removing the rotating blade mounting portion 23 from the fixed blade mounting portion 25, and the inside of the grinder housing 51 can be easily cleaned. In addition, in the state where the grinding portion 17 is assembled, the fixed blade 24 and the rotating blade 22 are stored in the storage cylinder portion 55, so that coffee powder is not easy to penetrate between the rotating blade 22 and the cover member 32, and maintenance is easy. In addition, the particle size adjustment device 65 is assembled in the fixed blade mounting portion 25, the fixed blade bracket 66 is inserted into the front wall portion 56 of the storage cylinder portion 55, and the rear side of the fixed blade bracket 66 is arranged in the storage cylinder portion 55, and the fixed blade bracket 66 is configured in a manner that the front and rear positions can be adjusted, and the position of the fixed blade 24 is adjusted, so that the particle size of the beverage raw material can be stably adjusted. Furthermore, 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, so that the grinding unit 17 can be easily removed. In addition, the rear end of the boss portion 46 of the driven gear 33 is movably inserted into the longitudinal recess 138 from the upper opening 138A thereof, so that when the grinding unit 17 is installed, the boss portion 46 of the driven gear 33 can be guided to the longitudinal recess 138 and the installation work can be stably performed. Furthermore, around the front surface of the mounting plate 34, a pair of protrusions 37, 37 are provided to protrude forward to clamp the periphery of the rotating blade 22, and the protrusions 37, 37 rotate together with the rotating blade 22 close to the inner periphery of the storage cylinder 55, thereby removing the coffee powder accumulated on the inner periphery of the storage cylinder 55.

[0148] Furthermore, the reduction gear group 129 is provided with four shafts 131, 131, 131, 131 protruding from the rear part of the first rotating plate 130, and planetary gears, i.e., reduction gears 132, 132, 132, 132, are rotatably provided on each shaft 131, 131, 131, 131, and at the center of these reduction gears 132, 132, 132, 132, the motor side gear 126 as a sun gear and each reduction gear 132, 132, 132 are rotatably provided. 32 and 132 are meshing, and a sun gear, i.e., the transmission gear 133, is integrally arranged on one side surface, i.e., the front center, of the first rotating plate 130, and a plurality of planetary gears, i.e., reduction gears 132A, 132A, 132A, 132A, having a smaller number of teeth than the transmission gear 133, are rotatably arranged on the other side surface, i.e., the rear side, of the second rotating plate 130A. Since the reduction mechanism is constituted by a planetary gear mechanism in this way, a higher reduction effect can be obtained in a small space.

[0149] In addition, the drop opening 62 of the grinding part 17 is provided at the center of the plurality of nozzles 145, so that the coffee powder can be dropped and supplied to the center of the filter cup 8. In addition, the drop opening 62 can be opened and closed by the baffle 143 as an opening and closing device. Furthermore, by attaching and detaching the grinding part 17 to and from the mounting recess 19, the drop opening 62 can be connected to the insertion hole 142 as a connection receiving part of the hot water supply part 18, and the connection can be released.

[0150] [Example 2]

[0151] Figure 22-23 The second embodiment of the present invention is shown. The same reference numerals are used for the same parts as those of the first embodiment, and the description thereof is omitted. This figure shows a modified example of the rotating blade 22 and the fixed blade 24.

[0152] In this example, the reserved hole 171 and the positioning protrusion 172 are not provided in the disc body 150 of the rotating blade 22. Therefore, the tapered hole 173 and the positioning hole portion 174 are not provided in the blade portion 151. In addition, during the manufacturing, insert molding is performed. That is, in a state where the blade portion 151 is arranged in a molding die (not shown), molten resin is filled in the molding die, and the resin is solidified to form the disc body 150, and the disc body 150 and the blade portion 151 are integrated.

[0153] In addition, although not shown, the reserved hole 171 is not provided in the disc body 150A of the fixed blade 24. Therefore, the tapered hole 173 is not provided in the blade portion 151A. In addition, during manufacturing, insert molding is performed. That is, in a state where the blade portion 151A is arranged in a molding die (not shown), molten resin is filled in the molding die, and the resin is solidified to form the disc body 150A, and the disc body 150A is integrated with the blade portion 151A.

[0154] Thus, in this embodiment, the same action and effect as those of the embodiment 1 are obtained. In this embodiment, the disk body 150, 150A and the blade portion 151, 151A are integrated by insert molding, so that a fixing structure and fixing work are not required.

[0155] [Example 3]

[0156] Fig.24 The third embodiment of the present invention is shown. The same reference numerals are used for the same parts as those in the above-mentioned embodiments, and the description thereof is omitted. This figure shows an electric grinding device 200 , in which a grinding section 17 and a driving unit 121 are provided in a housing body 201 .

[0157] As shown in the figure, the housing body 201 is in a substantially rectangular parallelepiped shape. A mounting recess 19 is provided at the upper portion of the housing body 201, and the grinding unit 17 is detachably provided at the mounting recess 19. In addition, the driving unit 121 is built into the upper rear side of the housing body 201.

[0158] A storage shell 202 for storing coffee powder dropped from the drop opening 62 of the grinding unit 17 is built into the lower front side of the shell body 201. The storage shell 202 is configured to be withdrawn from an opening 203 provided at the lower front surface of the shell body 201, and a handle 204 is provided on the front surface thereof.

[0159] As described above, this embodiment includes the rotating blade 22 and the fixed blade 24 as grinding blades, and the grinding device 200 including the rotating blade 22 and the fixed blade 24, and therefore, the same operations and effects as those of the first embodiment are achieved.

[0160] In addition, the grinding device 200 has a shell body 201 as a main body, a grinding part 17 arranged on the upper part of the shell body 201 and grinding and discharging coffee beans as a beverage raw material, and a motor 21 arranged on the shell body 201 and used to operate the grinding part 17, wherein the grinding part 17 is detachably mounted on the shell body 201, and the grinding part 17 has a driven gear 33 as a driven side transmission mechanism, a disc-shaped rotating knife 22 connected to the driven gear 33 and detachably mounted on the grinding part 17, and a disc-shaped fixed knife 24 arranged opposite to the rotating knife 22 and fixed to the grinding part 17, and the shell body 201 has a driving gear 122 as a driving side transmission mechanism, the driving gear 122 is rotated by the motor 21, and is detachably combined with the driven gear 33, thereby achieving the same function and effect as the first embodiment.

[0161] [Example 4]

[0162] Fig.25 This figure shows a modification in which grooves 153 of one of the rotating blade 22 and the fixed blade 24A are formed at unequal intervals in the circumferential direction.

[0163] In this example, the rotating blade 22 has four grooves 153 formed at equal intervals in the circumferential direction, as in the first embodiment, and the four grooves 153 of the fixed blade 24A are formed at unequal intervals in the circumferential direction. Furthermore, the angles θ1, θ2, θ3, and θ4 of the circumferential intervals between adjacent grooves 153, 153 of the fixed blade 24A are 80 degrees, 95 degrees, 100 degrees, and 85 degrees, and all the angles θ1, θ2, θ3, and θ4 of the circumferential intervals are different from the circumferential interval of the rotating blade 22, i.e., 90 degrees.

[0164] In this case, the groove portion 153 of the fixed knife 24A has the same shape as the cutting knife 157, the inner intersection portion 159 and the arc inner edge portion 170, and forms a front curved edge portion 156 corresponding to the angles θ1, θ2, θ3, θ4 spaced in the circumferential direction. The groove portion 153 with larger angles θ1, θ2, θ3, θ4 spaced in the circumferential direction has a larger width.

[0165] In this way, when the rotating blade 22 has four grooves 153, 153, 153, 153 formed at equal intervals in the circumferential direction, and the fixed blade 24A has the same number of four grooves 153, 153, 153, 153, if the angle of the circumferential interval between two adjacent grooves 153, 153 is set to an angle other than 90 degrees, and the angle θ of the circumferential interval between the remaining two adjacent grooves 153, 153 is set to 90 degrees, then the vibration and noise can be reduced more than when all the angles θ are 90 degrees. However, when any one of θ1 to θ4 is 90 degrees, the coffee beans are crushed simultaneously in the adjacent two grooves 153, 153 of the fixed blade 24A and the adjacent two grooves 153, 153 of the rotating blade 22, and thus the load is uneven. Therefore, when all the angles are different, the vibration and noise can be reduced more. In addition, for example, when the sum of θ1 and θ2 is 180 degrees, coffee beans are crushed simultaneously in the two sets of grooves 153, 153, so it is desirable that the sum of adjacent angles among θ1 to θ4 is not 180 degrees.

[0166] As described above, in this embodiment, the circumferential intervals of the grooves 153 of the stationary blade 24A and the circumferential intervals of the grooves 153 of the rotating blade 22 are different, and thus the same functions and effects as those of the first embodiment are achieved.

[0167] Furthermore, the grooves 153 of either the fixed blade 24A or the rotating blade 22, i.e., the fixed blade 24A, are formed at unequal intervals in the circumferential direction, so that the grinding time of the coffee beans can be staggered and the instantaneous load applied to the fixed blade 24A and the rotating blade 22 can be reduced, thereby reducing the vibration and noise of the grinding device 20.

[0168] In addition, the present invention is not limited to the above embodiments, and various modifications can be implemented within the scope of the main purpose of the invention. For example, in the embodiment, the number of the grooves of the fixed knife is greater than the number of the grooves of the rotating knife, but it can also be the opposite. In addition, the grooves of the rotating knife can be formed at unequal intervals in the circumferential direction. Furthermore, the grooves of both the rotating knife and the fixed knife can also be formed at unequal intervals in the circumferential direction. Furthermore, angles θ1, θ2, θ3, and θ4 can also be appropriately selected. In addition, in the embodiment, curved groove openings and grooves are shown, but the groove openings and grooves can also be roughly triangular. In the case of roughly triangular groove openings and grooves, it is also preferred to obliquely configure the groove openings and grooves in a manner that the outer intersection is located closer to the rear side of the rotation direction than the inner intersection. Furthermore, the rotation center axis of the driven gear and the driving gear is preferably set to the same height, but the rotation center axis of the driven gear can also be set to a position higher than the rotation center axis of the driving gear so that the driven gear and the driving gear are engaged. In this case, it is preferred to stagger the plane positions of the rotation center axes in such a way that the rotation center axes are not located directly above each other. In addition, the grinding device of the present invention is suitable for crushing coffee beans, but can also crush things other than coffee beans, such as tea, etc.

Claims

1. A grinding device comprising: a fixed blade having a blade portion having a plurality of grooves; and a rotating blade having a blade portion having a plurality of grooves; in a state where the blade portions of the fixed blade and the rotating blade face each other, the rotating blade rotates relative to the fixed blade, wherein: The groove of the rotating blade has a front curved edge on the front side of the rotating blade in the rotating direction, and has a cutting blade composed of a rear curved edge on the rear side of the rotating direction. The groove portion of the fixed blade has the front curved edge portion and has the cutting blade, The circumferential spacing between the cutting knives of the grooves adjacent to each other in the circumferential direction of the fixed knife is different from the circumferential spacing between the cutting knives of the grooves adjacent to each other in the circumferential direction of the rotating knife. The cutting blade forms the grooves of the fixed blade at equal intervals in the circumferential direction, and the cutting blade forms the grooves of the rotating blade at equal intervals in the circumferential direction, and the number of the grooves formed on the fixed blade is different from the number of the grooves formed on the rotating blade.

2. The grinding device according to claim 1, characterized in that: The number of grooves formed in the stationary blade and the number of grooves formed in the rotating blade do not have a common divisor relationship.

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