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I
US005287795A
United States Patent [19]
[[11] Patent Number:
5,287,795
Enomoto
[451
Date of Patent:
Feb. 22, 1994
[54] COFFEE MAKER
[76]
Inventor:
Kazuo Enomoto, 7-1-5
,
Sumiyoshi-miyacho, Higashinada,
Kobe, Hyogo 658, Japan
[21] App1.No.: 986,363
[22] Filed:
[30]
Dec. 7, 1992
Japan ..
Primary Examiner-Robert W. Jenkins
Attorney, Agent, or Firm-Marshall, OfToole, Gerstein,
Murray & Borun
[57]
Foreign Application Priority Data
Dec. 11, 1991 [JP]
3-251212 11/1991 Japan .
4-40916 2/1992 Japan .
4-224719 8/1992 Japan .
This disclosure relates to a coffee maker for performing
........... .. 3-3s1442
the appropriate automatic operation in accordance with
whether or not there are coffee beans contained in the
[51]
Int. (:1.5 .............................. .. A47J 31/42
[52]
US. Cl. ...................................... .. 99/280; 99/286;
241/65; 241/1012
[58]
Field of Search ............... .. 99/286, 290, 295, 300,
99/304, 305, 306, 307, 302, 280; 426/433;
241/101.2, 65
[56]
References Cited
U.S. PATENT DOCUMENTS
4,172,413 10/1979 Roseberry ........................... .. 99/286
4,459,524
7/1984
4,555,984
4,644,571
4,895,308
5,083,502
12/1985
2/1987
1/1990
1/1992
Oota ............ ..
99/286
Yamashita .
99/286
99/286
Narita .................................. ..
Tanaka .
Enomoto .
FOREIGN PATENT DOCUMENTS
35-18243
3-16128
1-190317
1-190318
2-237519
6/1956
7/1989
7/1989
7/1989
9/1990
Japan .
Japan .
Japan .
apparatus, informing the user of the type of automatic
operation which is possible to perform at the present
time, and, in the event that the user has not completed
all of the necessary preparations for operation, prevent
ing the occurrence of useless operation and dangerous
operating conditions by automatically stopping opera- '
tion at the point just before the step for which the prep
arations have not been completed. The coffee maker
includes a temporary holding and cooling means pro
vided with a sensor for detecting remaining coffee
beans, and a controller begins the ?rst automatic sub
process operation starting from the roasting of the raw
coffee Beans by the roaster if this sensor for detecting
remaining coffee beans does not detect any coffee
beans, and also so that it begins the second automatic
subprocess operation starting from the grinding of the
beans by the grinding means if coffee beans are de
tected.
Japan .
Japan .
5 Claims, 10 Drawing Sheets
US. Patent
Feb. 22, 1994
FIG.1
Sheet 1 of 10
5,287,795
US. Patent
Feb. 22, 1994
FIG.2
Sheet 2 of 10
5,287,795
US. Patent
Feb. 22, 1994 '
Sheet 5 of 107
5,287,795
(POWER SWITCH ED ON )
POWER LED LIGHTS UP‘
'
‘S1
s2
YES
ggQgc Q
ARE THERE -
ROASTED BEANS’
NO
s3
ROASTED BEANS LED
LIGHTS UF’
FULL-AUTO LED
FLASHES ON AND OFF
ROASTlNG-POSSIBLE
LED )
LIGHTS UP
FULL-AUTO LED
LKSHTS UP
S4
S62
FULL-AUTO
ON?
T
T H
HED
N?
TQ FIG. 5C
IS FILTER
= ‘ KET SECURE
HG. 5A
ROASTlNG HEATER
SWITCHES ON
STIRRING MGTOR SWIT
CHES ON
ROASTING-lN-PROGRESS
LED
uems UP
l TO FIG. 5B
US. Patent
Feb. 22, 1994
Sheet 6 of 10
FROM FIG. 5A
ROASTING HEATER
SWITCHES OFF
.
S10
/
SOLENOID SWITCHES ON
ROASTING-IN-PROGRESS LED
GOES OUT
I
FAN
MOTOR
'
--—S11
SWITCHES ON
COOLING-IN- PROGRESS
LED LIGHTS UP
STIRRING MOTOR
/
SWITCHES OFF
SOLENOID SWITCHES OFF
FIGSB
5,287,795
US. Patent
Feb. 22, 1994
5,287,795
Sheet 7 of 10
‘FROM FIGISA
7
To
F‘
.
‘6 5A
-/- FULL-AUTO LED GOES our
MILLING-IN-PROGRESS
AND DRIPPING-IN-PROG
563
S64
RESS LEDs FLASH
ON AND OFF
NO
92/
IS FILTE
BA KET SEC
I
MILLING-IN-PROGRESS
‘
LED FLASHES
ON AND OFF
YES
ED.
/se5
MILL MOTOR SWITCHES ON.
MILLING-lN-PROGRESS
.
LED
LIGHTS UP.
S66
HAS 30 SEC. PASSE
I
MILL MOTOR> SWITCHES OFF
MILLING-IN-PROGRESS
LED GOES OUT
S74\
DRIPPING- I N~PROGRESS
'
i
LED FLASHES
ON AND OF
BOILER HEATER
SWITCHES ON
KEEP-WARM HEATER
SWITCHES ON
DRIPPING-IN-PROGRESS
LED LIGHTS UP
WARMER-ON LED
LIGHTS UP
- 570
s THERE WATER?
NO
FIG.5C
US. Patent
Feb. 22, 1994
Sheet 8 of 10
5,287,795
g3)
S15
s31
MILLING-lN-PROGRESS /
BOILER HEATER
SWITCHES ON
LED
FLASHES ON AND OFF
KEEP-WARM HEATER
SWITCHES ON
DRIPPING-IN- PROGRESS
LED LIGHTS UP
WARMER-ON LED
LIGHTS UP
MILLING-IN-PROGRESS
LED
GOES OUT
FAN MOTOR
SWITCHES OFF
COOLING -IN -PROGRESS
LED GOES OUT
$18
PROCEEDFROM
S7 THROUGH S14
AND ON TO S15
I
MILL MOTOR
ROASTING HEATER
SWITCHES ON
MlLLING-IN-PROGRESS
LED LIGHTS UP
SWITCHES ON
STIRRING MOTOR
SWITCHES ON
ROASTING-IN-PROGRE SS
L E D LIGH TS UP
S34
MILL MOTOR
EMPERATURE
SENSOR DE TECT
SWITCHES OFF
MILLING-IN-PROGRESS
LED GOES OUT
S35
ROASTING HEATER
SWITCHES OFF
SOLENOID SWITCHES ON
ROASTI NG-IN- PROGRESS
LE D
LIGHTS UP
TO FIGGB
FIG. 6A
ITO FIG. 6B
US. Patent
Feb. 22, 1994
FROM FIG. 6A
522
Sheet 9 of 10
'
l
FROM FIG- 6A
S36
\ BOILER HEATER
SWITCHES OFF
5,287,795
\
1
FAN MOTOR
SWITCHES ON
DRlPPlNG-lN-PROGRESS
COOLING-lN-PROGRESS
LED GOES
LED
UGHTS up
OUT
- STIRRING MOTOR
\ KEEP-WARM HEATER
SWITCHEs OFF
WARMER-ON LED
GOES ou'r
SWITCHES OFF
SOLENOID SWITCHES OFF
FAN MOTOR
SWfTCHES OFF
COOLING- lN-PROGRESS
FIG.6B
US. Patent
Feb. 22, 1994
Sheet 10 of 10
5,287,795
R
DRIRRINEéIg-RRQGRESS /S51
FLASHES ON AND OFF‘.
HAS iwArER
BEEN PROVIDED’
DRIPPlNG-IN- PROGRESS /
LED
GOES our
PROCE E‘
0
F ROM
THROUGH s14
58
554 ,
/
AND ON TO 515.
VPROCEED FROM S8 THROUGH
S14 AND FROM S17 THROUGH S2Q
AND THEN STANDBY
WAITING FOR WATER
S56
1
5,287,795
COFFEE MAKER
FIELD AND BACKGROUND OF THE
INVENTION
This invention relates to an automatic coffee maker
capable of providing coffee from raw coffee beans
through a process of roasting, grinding, and brewing.
The present inventor has previously proposed coffee
makers capable of providing coffee completely auto
2
brewing means which collects the ground coffee beans
ground by the grinding means and the hot water from
the water heating and supply means and brews the cof
fee, and a microcomputer-equipped controller. The
coffee maker has the capabability of performing all of
the process steps from the roasting of the raw coffee
beans to the brewing of the coffee completely automati
cally, and a primary feature of the coffee maker accord
ing to this invention is that the temporary holding and
matically from raw coffee beans, as described in Japa
nese Patent early publication Hei. 2-237,5l9 dated Sep.
cooling means is provided with a sensor for detecting
remaining coffee beans, and the controller begins the
?rst automatic subprocess starting from the roasting of
20, 1990, early publication Hei. 3-251,2l2 dated Nov. 8,
1991, and early publication Hei. 4-40916 dated Feb. 12,
not detect any coffee beans, and also so that it begins the
1992. With these coffee makers, the raw coffee beans
were roasted, cooled, ground, and then the coffee was
brewed in a serial type process or procedure, and the
next operation could not begin until this serial proce
the raw coffee beans by the roaster if this sensor does
second automatic subprocess starting from the grinding
of the beans by the grinding means if coffee beans are
detected.
In addition to the ?rst feature described above, a
dure had been completed. In contrast, with the fully
second feature of the coffee maker of this invention is
automatic coffee maker proposed in Japanese Patent
that the controller is comprised such that, when coffee
beans are detected by the sensor for detecting remaining
early Application Hei. 4—2247l9 dated Aug. 14, 1992, by
providing a temporary holding tank for cooling and
temporarily holding the roasted coffee beans, it became
possible to perform the subprocess consisting of roast
ing through cooling and holding simultaneously and in
parallel with the subprocess consisting of grinding
through brewing.
However, even with the coffee maker in Japanese
Patent early publication Hei. 4,224719 referred to
above, the selection between either the subprocess com
prised of roasting through cooling and holding or the
subprocess comprised of grinding through brewing was
left to the judgment of the user, with the coffee maker
itself not having the capabability of automatically mak
ing the selection. In addition, it was not indicated to the
user whether the procedure performed by the start of
operation was the subprocess beginning from roasting
or the subprocess beginning from grinding. Thus, oper
coffee beans, the controller displays on the control
panel an indication that there are roasted beans in the
coffee maker and an indication that the second auto
matic subprocess is possible, and also so that, when
coffee beans are not detected, it displays on the control
panel an indication that roasting is possible and an indi
cation that the ?rst automatic subprocess is possible.
In addition to the ?rst and second features described
above, a third feature of the coffee maker of this inven
tion is that the controller is composed so that it becomes
possible to re-start the ?rst automatic operation immedi
ately following the start of the grinding of the roasted
coffee beans by the grinding means.
In addition to the features described above, a fourth
feature of the coffee maker of this invention is that, in
addition to the brewing means being freely detachable
from the apparatus, a brewing means detection sensor is
ation was not very convenient. Moreover, in such cases
provided
to detect whether or not the brewing means is
40
as when the brewing means had not been secured in
secured in position and, furthermore, the controller is
position or the water for the hot water supply had not
composed so that the grinding means will not begin
been prepared, the judgment to stop operation already
operation if this brewing means detection sensor detects
in progress was not made with suf?cient accuracy and
that the brewing means is not secured in position.‘
In addition to the features described above, a ?fth
feature of the coffee maker of this invention is that a
the problems of the prior art described above by provid
tank-empty sensor is provided to detect whether or not
ing a coffee maker which is capable of performing the
there is water in the water tank and, furthermore, the
appropriate automatic operation by sensing whether or
controller is composed so that the heater of the water
not there are coffee beans contained in the apparatus,
which is also capable of informing the user of the type 50 heating and supply means will not be switched on if this
tank-empty sensor detects that there is no water in the
of automatic operation that is possible to perform at the
water tank.
present time, and which, in the event that the user has
reliability.
Thus, a primary objective of this invention is to avoid 45
not completed all of the necessary preparations for
operation, is also capable of preventing the occurrence
of useless operation and dangerous operating conditions
In the operation of the coffee maker, with the ?rst
feature of this invention described above, the coffee
55 maker itself automatically judges whether or not there
are coffee beans in the temporary holding and cooling
by automatically stopping operation at the point just
means, and if there are none, automatic operation of the
before the step for which the preparations have not
been completed.
SUMMARY OF THE INVENTION
A coffee maker in accordance with this invention
comprises a roaster which roasts raw coffee beans, a
temporary holding and cooling means which temporar
ily holds and fan cools the coffee beans roasted by the
roaster, a grinding means which grinds the beans from 65
the temporary holding and cooling means and supplies
the ground coffee, a water heating and supply means
which heats and supplies the water from a water tank, a
subprocess starting from the roasting of the coffee beans
by the roaster is begun. If coffee beans are detected,
then automatic operation of the subprocess starting
from the grinding of the beans by the grinding means is
begun. In other words, the coffee maker automatically
selects between the subprocess starting from the roast
ing step or subprocess starting from the grinding step.
With the second feature described above, in addition
to the operation provided by the ?rst feature, when
coffee beans are detected by the sensor for detecting
remaining coffee beans, an indication that there are
3
5,287,795
4
roasted beans in the coffee maker and an indication that
placement space S which is formed by shaping a corner
the second automatic subprocess is possible is displayed
of the outer case 1 into a concave shape. In addition, the
on the control panel, and, when coffee beans are not
detected, an indication that roasting is possible and an
?lter basket 2 is a container-shaped component for the
indication that the ?rst automatic subprocess is possible,
and a ?lter is placed in a freely removable manner into
are displayed on the control panel. As a result, these
indications provide the user with information concern
this ?lter basket along the inner walls of the basket. For
purpose of brewing, ?ltering, and dripping the coffee,
this ?lter it is possible to use a disposable type such as a
paper ?lter.
.ing the present condition and subsequent operation of
the coffee maker, thus making the coffee maker ex
tremely easy to use.
With the third feature described above, in addition to
the operation provided by the ?rst or second features, it
is possible to re-start the fust automatic subprocess
immediately following the start of the grinding of the
roasted coffee beans by the grinding means. As a result,
it is possible to simultaneously perform at least the
brewing of the coffee and the roasting of a new batch of
raw coffee beans to be used next, thus making it possible
to obtain brewed coffee from raw coffee beans with
good operational efficiency.
10
On both sides of the ceiling part of the decanter
placement space S, supporting guides 4 are provided as
a means of securing the ?lter basket 2. The ?lter basket
2 is secured by inserting it so that the ?anges 2b on the
side edges of the opening 2a in the basket rest on the
supporting guides 4. In addition, the secured state can
be easily released by sliding out the filter basket 2, thus .
allowing the ?lter basket 2 to be freely removed.
In the top of the outer case 1 are provided a coffee
bean supply opening 5, a water supply opening 6, and an
exhaust opening 7 for the roaster 10, which will be
described later.
,
With the fourth feature described above, in addition
A roaster 10 (FIG. 2) is provided in the uppermost
to the operation provided by the ?rst, second, or third
part inside the outer case 1. This roaster 10 is a device
features, the operation of the grinding means will not
which roasts the raw coffee beans which are placed
begin if the brewing means is not secured in position on _ inside through the opening 5, and it is comprised of an
the coffee maker. In other words, the coffee maker will 25 aluminum container 11. Inside this container 11, a stir
wait in a standby state just prior to the grinding of the
ring blade 12 is provided at the bottom of the container
roasted beans, thus preventing the coffee beans from
11, a sheathed heater (roasting heater) 13 for roasting is
being ground and supplied while the preparation of the
provided at the upper part of the container 11, and a
brewing means has not been completed.
high temperature catalyst ?lter 14 for smoke and odor
With the ?fth feature described above, in addition to 30 removal is also provided. In addition, a coffee bean
the operation provided by the ?rst, second, third, or
discharge door 15 is provided at a section of the bottom
fourth features, because the heater of the water heating
of the container 11, and this door is designed so that it
and supply means will not be switched on if the tank
can be opened and closed by a solenoid 16. A tempera
empty sensor detects that there is no water, empty or
waterless heating is prevented, and, in addition, heating
is reliably stopped when the supply of the hot water has
been completed.
ture sensor 17 is also installed on the underside of the
35 bottom of the container 11, and it detects the comple
tion of roasting by means of the temperature at the
underside of the container. A stirring motor 18 turns the
stirring blade 12 via an anti-thermal-conduction joint
BRIEF DESCRIPTION OF THE DRAWINGS
19. Furthermore, in order to prevent any adverse effects
The invention will be better understood from the 40 from the radiation of heat from the container 11, which
following detailed description taken in conjunction
is a source of heat radiation, a radiant heat blocking
with the accompanying ?gures of the drawings,
wherein:
plate 8 is arranged beneath the container 11, thus isolat
ing the compartment in which the roaster 10 is located
from the stirring motor 18, and also from other compo
FIG. 1 is an overall perspective view of an embodi
ment of a coffee maker in accordance with this inven 45 nents such as the cooling means and controller, which
tion;
FIG. 2 is a cross-sectional diagrammatic view of the
coffee maker;
FIG. 3 is a view of the control panel of a controller of
will be described later. This radiant heat blocking plate
8, unlike the synthetic resin of the outer case 1, is prefer
ably comprised of iron plate.
Beneath the discharge door 15 of the roaster 10, a
50 holding tank cooler 20 is provided independently as a
the coffee maker;
FIG. 4 is a block diagram illustrating the controls
means of temporarily holding and cooling the roasted
performed by a microcomputer of the controller;
coffee beans. This cooler 20 is comprised of a blower
FlGS. 5A, 5B and 5C are three parts of a ?owchart
showing the control operations of the microcomputer,
case 21, a temporary holding tank 22 located inside the
blower case, and a fan blower 23 which draws in and
the three parts being connected as shown in these ?g 55 blows air from the outside. The temporary holding tank
ures to form a single ?owchart; and
FIGS. 6A, 6B and 6C are three parts of another ?ow
chart showing the control operations of the microcom
puter, the three parts being connected as shown in these
three ?gures to form a single ?owchart.
DETAILED DESCRIPTION
With reference ?rst to FIG. 1, inside an outer case 1
22 features a mesh construction for at least its lower
half, thus allowing the air blown in by the blower 23 to
enter from the lower half of the temporary holding tank
22 and then escape upward. At the bottom of the tem
porary holding tank 22 are provided an optical sensor
24 for detecting remaining coffee beans and a drop door
or shutter 25. Cooling air exhaust holes 26 are provided
in the radiant heat blocking plate 8.
are contained all of the major components of the coffee
A grinder 30 is provided independently beneath the
maker with the exception of the ?lter basket 2, which 65 temporary holding tank 22 of the cooler 20 as a means
forms the coffee brewing means, and the decanter 3.
for grinding the coffee beans. This grinder 30 is a mill
The decanter 3 is a container for the purpose of catch
type grinder. Beneath the coffee bean receiving opening
ing the dripped coffee, and it is placed in a decanter
31 is located a feed screw 33 turned by a motor (mill
5
5,287,795
motor) 32 equipped with a speed reducer, and at the end
in the conveying direction of this feed screw 33 is lo
cated a mill unit comprised of a revolving mill tooth 35
6
which indicates that there are roasted coffee beans re
maining in the temporary holding tank 22, a roasting-in
progress LED 101, a cooling-in-progress LED 102, a
secured to the end of the feed screw 33 and a stationary
milling-in-progress LED 103, a dripping-in-progress
mill tooth 34. The coffee beans are ground between the
revolving mill tooth 35 and the stationary mill tooth 34.
The degree to which the beans are ground may be ad
justed by turning an adjustment knob 36 in order to
adjust the gap between the revolving mill tooth 35 and
LED 104, and a warmer-on LED 105.
As shown in FIG. 4, the power switch 91, full auto
start switch 93, roasting darkness selection switch 95,
manual mill switch 98, manual drip switch 99, tempera
ture sensor 17, remaining coffee beans detection sensor
the stationary mill tooth 34. Beneath the mill unit is
provided a discharge opening 37 for the ground coffee
24, ?lter basket detection sensor 71, and tank-empty
beans.
The means for heating and supplying the water for
microcomputer 81 built into the controller 80, and the
the brewing of the coffee is comprised of a water tank
40, a vertical boiler 50, and a hot water supplier 60. The
water tank 40 collects the water which is poured in
through the water supply opening 6, and supplies it
from its bottom to the vertical boiler 50 via a water'
sensor 42 are connected to the input terminals of the
various LEDs 92, 94, 96, 97, 100, 101, 102, 103, 104, and
105, and also the roasting (sheathed) heater 13, solenoid
16, stirring motor 18, blower 23, mill motor 32, drip
heater 51, and keep-warm heater 73 are connected to
the output terminals of the microcomputer.
The following is a description of an example of the
automatic control executed by the controller 80, with
supply pipe 41 which is connected to the bottom of the
tank. Although the water tank 40 in this embodiment is 20 its built-in microcomputer 81, following the flow charts
a stationary or built-in type, it is also possible for it to be
in FIGS. 5 and 6. First, when the power switch 91 is
a cassette type capable of being freely inserted and
switched on, the power LED 92 lights up (step S1).
Then, the controller 80 uses the remaining coffee beans
removed. At the bottom of the water tank 40 is pro
vided a tank-empty sensor 42 which detects whether or
detection sensor 24 to judge whether or not there are
not there is water in the tank. In addition, by providing 25
a narrow neck 43 partway along the water supply pipe
41, it is possible to prevent the reverse flow of water
from the boiler 50, and to effectively cause the water
heated by the boiler 50 to ?ow upward through the hot
water supply pipe 53 to the hot water supplier 60. The 30
vertical boiler 50 has a heater 51 embedded inside its
peripheral wall, and a steam collector 52 provided at its
coffee beans in the temporary holding tank 22 (52). If
there are no beans, the roasting-possible LED 97 lights
up and the full-auto LED 94 also lights up (S3), thus
top. The hot water supply pipe 53 extends vertically
indicating that the ?rst automatic operation, starting
from the roasting of coffee beans by the roaster 10, is
possible. On the other hand, if there are coffee beans in
the temporary holding tank 22, the roasted-beans LED
100 lights up and the full auto LED 94 ?ashes on and off
(S61), thus indicating that the second automatic opera
tion, starting from the grinding of the coffee beans by
from the top of the boiler 50, with its upper end con
35 the grinder 30, is possible. Following the operational
nected to the hot. water supplier 60.
?ow from S2 to 53, when the full-auto start switch 93 is
The hot water supplier 60 is comprised of a ring
switched on (84), the controller 80 begins the ?rst auto
shaped container provided with a through-hole 61 at its
matic operation. Following the operational flow from
center, and in the bottom of the container, multiple hot
S2 to S61, when the full-auto start switch 93 is switched
water drop-supply openings 62 are provided concentri
cally around the through-hole 61. By ?tting the dis 40 on (S62), the controller 80 begins the second automatic
operation.
charge opening 37 of the grinder 30 into the through
When the ?rst automatic operation is begun, ?rst, the
hole 61, the through-hole 61 becomes a drop-supply
opening 61 for the ground coffee beans. This ground
full-auto LED 94 goes out ($5), the ?lter basket detec
tion sensor 71 detects whether or not the ?lter basket 2
coffee drop supply opening 61 and the hot water drop
supply openings 62 arranged around it face toward the 45 is secured in position (S6), and then, if the tank-empty
sensor 42 detects that there is water in the water tank 40
decanter placement space S from the ceiling part9 of
(S7), the roasting heater 13 is switched on, the stirring
the space S.
motor 18 is switched on, and the roasting-in-progress
A ?lter basket detection sensor 71 detects whether or
LED 101 lights up (S8). This causes roasting to begin.
not the ?lter basket 2, which is the coffee brewing
Then, when the temperature sensor 17 detects the pre
means, is secured to the ceiling part 9. F is a paper filter
determined temperature (S9), the roasting heater 13 is
placed inside the ?lter basket 2. A keep-warm plate 72 is
switched off, the solenoid 16 is switched on, and the
provided at the location in which the decanter 3 is
roasting in-progress LED 101 goes out (S10). When
placed, and 73 is a keep-warm heater. A controller 80 is
roasting is completed, the beans are discharged from the
located at a position lower than that of the radiant heat
blocking plate 8, and it contains a microcomputer and 55 roasting container 11 into the temporary holding tank
22. The blower 23 is then switched on, and the cooling
controls the various components of the coffee maker.
in-progress LED 102 lights up (S11). Ten seconds after
A control panel 90 for the controller 80 is provided
the start of S11, the stirring motor 18 is switched off and
on the outer case 1. As shown in FIG. 3, on this control
the solenoid 16 is also switched off (S12 and S13). Then,
panel 90 are arranged a power on-off switch 91 which
also functions as an operation cancel switch and a 60 when approximately 2 minutes and 10 seconds have
passed (S14) after the start of S13, the heater 51 of the
power LED 92 which indicates that the power is on, a
boiler 50 is switched on, the keep-warm heater 73 is
full-auto start switch 93 and a full-auto LED 94 which
switched on, the dripping-in-progress LED 104 lights
indicates the status of the switch, a roasting darkness
up and the warmer-on LED 105 also lights up (S15).
selection switch 95 and roasting darkness indication
LEDs 96 which indicate the selected roasting darkness, 65 The timing for the starting of the operation of the boiler
a roasting-possible LED 97 which indicates that roast
ing is possible, a manual mill (grind) switch 98 and a
manual drip (brew) switch 99, a roasted-beans LED 100
50 is set slightly early in order to ensure the smooth
supply of the heated water during the brewing step
following grinding. When 10 seconds have passed (S16)
7
5,287,795
8
.
after the start of 515 the blower 23 is switched off and
During the ?rst automatic operation, if it is detected
the cooling-in-progress LED 102 goes out ($17). The
total cooling time‘is approximately 2 minutes and 30
seconds. The drop shutter 25 of the temporary holding
that there is no water in the water tank 40 at $7, the
dripping-in-progress LED 104 will ?ash on and off
(S51) in order to indicate that there is no water and also
tank 22 then opens, the mill motor 32 is switched on,
that dripping is not possible. Then, if the water tank 40
is provided with water ($52) at some stage along the
way (by the time that the operational ?ow has pro
ceeded from S8 to S14), the dripping-in-progress LED
104 will go out (S53) and the operational ?ow will
proceed from S8 through S14 and on to S15 (S54). If the
and the milling-in-progress LED 103 lights up ($18).
After grinding is carried out for about 30 seconds ($19),
the mill motor 32 is switched off, the milling-improgress
LED 103 goes out, and grinding is stopped (S20).
At the completion of grinding, the roasting-possible
water tank 40 is not provided with water at some stage
LED 97 lights up and the full-auto LED 94 also lights
along the way (by the time that the operational ?ow has
up. In other words, the operational ?ow branches back
proceeded from S8 to S14), the operational ?ow will
to S3, and it becomes possible to begin the next ?rst
proceed from S8 through S14, and from S17 through
automatic operation or subprocess.
When the grinding at S18 begins, while the ground 15 S20, and the coffee maker will then wait in a standby
state with the ground coffee beans having been supplied
coffee powder is being successively supplied through
to the ?lter basket 2 (S55). Then, when the water tank
the drop-supply opening 61 into the ?lter basket 2, the
40 is subsequently provided with water (S56), the oper
heated water is supplied through the hot water drop
ational ?ow will proceed to S69, which will be de
supply openings 62, beginning just slightly later than the
start of the drop-supply of the ground coffee, and thus 20 scribed later, the heated water will be supplied, and the
coffee will be brewed.
dripping begins. Then, when the tank-empty sensor 42
When the second automatic operation or subprocess
detects that there is no more water in the water tank 40
is begun (S62), ?rst, the full-auto LED 94 goes out
(521), the heater 51 of the boiler 50 is switched off and
(S63), and, if the ?lter basket detection sensor 71 detects
the dripping-in-progress LED 104 goes out ($22). After
2 hours have passed (S23), the keep-warm heater 73 is 25 that the ?lter basket 2 is secured in position (864), the
drop shutter 25 of the temporary holding tank 22 opens,
switched off and the warmer-on LED 105 goes out
the mill motor 32 is switched on, the milling-in-progress
(S24).
LED 103 lights up, and grinding begins ($65). The
During the ?rst automatic operation, if it is detected
that the ?lter basket 2 is not secured in position at $6, 30 ground coffee beans are drop-supplied into the ?lter
basket 2. Then, after 30 seconds have passed (S66), the
the milling-in-progress LED 103 will ?ash on and off
mill motor 32 is switched off, the milling-in-progress
(S31) in order to indicate that the ?lter basket 2 is not
LED 103 goes out ($67), and grinding is stopped.
secured in position and also that, in this state, operation
When grinding is completed, the roasting possible
will not proceed to the grinding step. If the ?lter basket
LED 97 lights up, and the full-auto LED 94 also lights
2 is not subsequently secured in position (S32), opera
up (53), thus indicating that the ?rst automatic opera
tion will end with only the roasting step and the cooling
tion
is possible. Of course, the original operational flow
step having been completed, the roasted-beans LED
continues, and when water is detected in the water tank
100 will light up, and the full-auto LED 94 will ?ash on
40 (S68), the heater 51 of the boiler 50 is switched on,
and off, thus indicating that the second automatic opera
the keep-warm heater 73 is switched on, the dripping
tion or subprocess, which starts from the grinding of the
in-progress LED 104 lights up, the warmer-on LED
roasted coffee beans by the grinder 30, is possible. In
105 lights up (569), and the brewing and keeping-warm
other words, even if the ?lter basket 2 is not secured in
of the coffee begin. Then, when there is no more water
position (S32), the roasting heater 13 will be switched
in the water tank 40 (S70), the operational ?ow pro
on, the stirring motor 18 will be switched on, the roast
ceeds to S22, the heater 51 of the boiler 50 is switched
ing-in-progress LED 101 will light up ($33), and roast 45 off, the dripping-in-progress LED 104 goes out, and
ing will begin. Then, when the temperature sensor 17
brewing is stopped. Then, after 2 hours have passed, the
detects the predetermined temperature (S34), the roast
keep warm operation is stopped (S24).
ing heater 13 is switched off, the solenoid 16 is switched
During the second automatic operation or subproc
on, the roasting-in-progress LED 101 goes out (S35),
ess, if it is detected that the filter basket 2 is not secured
roasting is stopped and the beans are discharged into the
in position at S64, it is determined whether or not there
temporary holding tank 22, and then the blower 23 is
is water in the water tank 40 (S71), and, if there is water,
switched on, the cooling~in-progress LED 102 lights up
the milling-in-progress LED 103 flashes on and off
(S36), and cooling begins. After l0 seconds have passed
(S72) in order to indicate that the filter basket 2 is not
($37), the stirring motor 18 is switched off, the solenoid
secured in position and that grinding is not possible in
16 is also switched off (S38), and then, after another
this state. If there is no water, the milling-in-progress
approximately 2 minutes and 20 seconds have passed
LED 103 and the dripping-in-progress LED 104 will
(S39), the blower 23 is switched off, the cooling-in-pro
both ?ash on-and off (S73), thus indicating that there is
gress LED 102 goes out (S40), and the ?rst automatic
no water and also that the ?lter basket 2 is not secured
operation or subprocess is stopped partway through its
in position.
’
?ow. At this time the S61 indication will be displayed 60 In addition, during the second automatic operation, if
on the control panel 90 in order to indicate that the
it is detected that there is no water at $68, the dripping
second automatic operation or subprocess is possible.
in-progress LED 104 will ?ash on and off (S74) and the
At S32, if the ?lter basket 2 has been secured in posi
coffee maker will then wait in a standby state until the
tion at some stage along the way (by the time that the
water tank 40 is provided with water.
operational flow has proceeded from S7 to S14), the 65 It should be noted that, although in the embodiment
milling-in-progress LED 103 will go out (S41) and the
explained above, the point at which the mill motor 32
operational flow will proceed from S7 through 814 and
on to S15.
was switched off is used as the point at which it be
comes possible to re-start the ?rst automatic operation
5,287,795
or subprocess starting from the roasting step, it is also
10
and, furthermore, because the controller is composed so
that the heater of the water heating and supply means
will not be switched on if this tank-empty sensor detects
possible to use some point prior to the switching off of '
the mill motor 32, as long as it is after the point at which
the coffee bean drop shutter 25 of the temporary hold
ing tank 22 opens and the mill motor 32 is switched on
that there is no water in the water tank, in addition to
and begins grinding.
heating is prevented, and, in addition, heating is reliably
the advantages described above, empty or waterless
stopped when the supply of the hot water has been
With the coffee maker as described and claimed
completed, thus ensuring safety.
herein having the composition described above, in a
coffee maker capable of performing all of the steps from
the roasting of the raw coffee beans to the brewing of
the coffee completely automatically, because the tem
The disclosures of K. Enomoto patent application
Ser. No. 07/986,111 ?led Dec. 4, 1992 and titled “Cof
fee Maker”; application Ser. No. 07/986,113 ?led Dec.
4, 1992 and titled “Small-Capacity Coffee Roaster”;
application Ser. No. 07/984,114 ?led Dec. 4, 1992 and
titled, “Coffee Maker”; and application Ser. No.
07/986,593 ?led simultaneously herewith and titled
“Coffee Maker,” are incorporated herein by reference.
porary holding and cooling means is provided with a
sensor for detecting remaining coffee beans and also
because the controller is composed so that it begins the
?rst automatic subprocess operation starting from the
roasting of the raw coffee beans by the roaster if this
sensor for detecting remaining coffee beans does not
detect any coffee beans, and also so that it begins the
What is claimed is:
1. An automatic coffee maker comprising an outer
second automatic subprocess operation starting from
case, a roaster mounted in said outer case for roasting
the grinding of the beans by the grinding means if coffee 20 raw coffee beans, a temporary holding and cooling
beans are detected, the coffee maker is capable of using
means mounted in said outer case and located to receive
its own judgement to reliably execute the appropriate
coffee beans from said roaster for temporarily holding
automatic subprocess operation, either automatic opera
and fan cooling the coffee beans roasted by said roaster,
tion starting from the roasting step or automatic opera
grinding means mounted in said outer case and located
tion starting from the grinding step, in accordance with 25 to receive coffee beans from said holding and cooling
whether or not there are coffee beans.
means for grinding the beans removed from said hold
In addition, because the controller is composed so
ing and cooling means and supplying ground coffee, a
that, when coffee beans are detected by the sensor for
water tank connected to said outer case, water heating
detecting remaining coffee beans, the controller dis
and supply means mounted in said outer case and con
plays on the control panel an indication that there are
roasted beans in the coffee maker and an indication that
nected to receive water from said water tank for heating
and supplying the water, brewing means mounted in
said case and connected to receive the ground coffee
beans ground by said grinding means and the hot water
the second automatic operation is possible, and also so
that, when coffee beans are not detected, it displays on
the control panel an indication that roasting is possible
from said water heating and supply means for brewing
the coffee, and a microcomputer equipped controller
for controlling all of the steps from the roasting of the
and an indication that the ?rst automatic operation is
possible, in addition to the advantages described above,
the user is informed whether or not there are coffee
raw coffee beans to the brewing of the coffee com
beans and which type of automatic operation is possible,
pletely automatically, said holding and cooling means
and, as a result, these indications provide the user with
further comprising sensor means for detecting coffee
beans therein, said controller being connected to said
information concerning the present condition and. sub
sequent operation of the coffee maker, thus making the
sensor means, to said roaster, and to said grinding means
and being operable to begin a ?rst automatic subprocess
operation starting from the roasting of the raw coffee
coffee maker extremely easy to use.
In addition, because the controller is composed so
that it becomes possible to re-start the ?rst automatic
subprocess operation immediately following the start of
the grinding of the roasted coffee beans by the grinding
beans by said roaster if said sensor means does not de
45 tect any coffee beans and to begin a second automatic
subprocess operation starting from the grinding of the
means, in addition to the advantages described above, it
becomes possible to re-start the ?rst automatic subproc
ess operation immediately following the start of the
beans by said grinding means if coffee beans are de
tected by said sensor means.
2. A coffee maker as described in claim 1, and further
grinding of the roasted coffee beans by the grinding 50 comprising a control panel including indicators, said
means. As a result, it is possible to simultaneously per
controller being connected to said indicators and being
form at least the brewing of the coffee and the roasting
operable such that, when coffee beans are detected by
of the raw coffee beans to be used next, thus making it
possible to obtain brewed coffee from raw coffee beans
with good operational ef?ciency.
said sensor means, said controller displays on said indi
cators that there are roasted beans and that said second
55
In addition, because the brewing means is freely de
automatic subprocess operation is possible, and also
such that, when coffee beans are not detected by said
sensor means, said controller displays on said indicators
tachable from the apparatus and a brewing means detec
tion sensor is provided to detect whether or not the
that roasting is possible and that said ?rst automatic
subprocess operation is possible.
'
brewing means is secured in position and, furthermore,
because the controller is composed so that the grinding 60 3. ‘A coffee maker as described in claim 1 or 2,
means will not begin operation if this brewing means
wherein said controller is operable to re-start said ?rst
detection sensor detects that the brewing means is not
automatic subprocess operation immediately following
secured in position, in addition to the advantages de
scribed above, it is possible to prevent the coffee beans
the start of the grinding of the roasted coffee beans by
said grinding means.
from being ground and supplied while the preparation
65
4. A coffee maker as described in claim 1 or 2,
of the brewing means has not been completed.
In addition, because a tank-empty sensor is provided
wherein said brewing means is freely detachable from
to detect whether or not there is water in the water tank
provided for detecting whether or not said brewing
said outer case, and a brewing means detection sensor is
11
5,287,795
12
means is secured in position in said outer case, and said
controller is operable such that said grinding means will
whether or not there is water in said water tank and said
controller is operable such that a heater of said water
not begin operation if said brewing means detection
heating and supply means will not be switched on if said
sensor detects that said brewing means is not secured in
position.
5 tank-empty sensor detects that there is no water in said
water tank.
5. A coffee maker as described in claim 1 or 2,
wherein a tank-empty sensor is provided for detecting
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