JPH0423438Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a roasting machine for heating and roasting coffee beans and the like.

(Prior Art) JP-A-56-72683 has been known as disclosing this type of roasting machine.

The roasting machine disclosed in the publication includes a rotary roasting drum that can accommodate coffee beans, a drive device that rotationally drives the rotary roasting drum, a roasting heat source, and a roasting heat source adjusting means. The coffee beans can be roasted by heating the roasting heat source while stirring the coffee beans by the rotation of the roasting rotary drum. Further, during roasting, a constant amount of electric power is supplied to the roasting heat source by the roasting heat source adjusting means so that a constant amount of heat is given to the coffee beans from the roasting heat source.

(Problem to be solved by the invention) However, in the above-mentioned conventional roasting machine, the calorific value of the roasting heat source is maintained constant from the start of roasting to the end, so the calorific value is set large. If the roasting temperature is too high, the roasting temperature will exceed the appropriate value in a short period of time, and the coffee beans will be heated abnormally and easily suffer thermal damage, and the roasting temperature cannot be finely adjusted by blowing air. There are drawbacks. On the other hand, if the calorific value is small, it becomes easier to finely adjust the roasting temperature by blowing air, but there is a drawback that it takes time for the roasting temperature to reach an appropriate value, and the roasting time becomes significantly longer.

This idea was created in view of the above problems.
The purpose is to provide a roasting machine that can perform roasting in a short time and efficiently by controlling the amount of heat generated by the heater during roasting.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a roasting machine that roasts an object to be roasted in a roasting container by heating a heating element. When the temperature inside the roasting container reaches the predetermined proper roasting temperature after the start,
A calorific value control means is provided to reduce the calorific value of the heating element from the initial calorific value.

(Function) In the roasting machine according to the present invention, when the temperature inside the roasting container reaches a predetermined appropriate roasting temperature after the start of roasting, the calorific value control means adjusts the calorific value of the heating element to the initial calorific value. decreases more than

In other words, in the roasting machine according to the present invention, it is possible to set the calorific value of the heating element to a large value at the beginning of roasting, thereby increasing the temperature in the roasting container until it reaches a predetermined appropriate roasting temperature. You can shorten the time.

In addition, after the temperature inside the roasting container reaches the predetermined appropriate roasting temperature, the calorific value of the heating element can be reduced compared to the initial calorific value, so the temperature inside the roasting container can significantly exceed the appropriate roasting temperature. This prevents the roasted object from being abnormally heated, and the temperature can be easily adjusted by blowing air.

(Example) Fig. 1 is a sectional view of a roasting machine, in which 11 is a cylindrical glass container, 12 is a glass container 1
1, and both open ends of the glass container 11 are a pair of closing plates 14 that constitute a part of the outer frame 12.
is blocked by. In this example, the above-mentioned glass container 11, outer frame 12, and closing plate 14 constitute a roasting container.

An inlet 15 for coffee beans is provided in the upper part of one of the closing plates 14, and an outlet 16 for coffee beans is provided in the lower part. In addition, a lid 1 is provided at the outlet 16.
7 is attached so that it can be opened and closed.

Reference numeral 13 denotes a motor that rotationally drives a wire mesh drum 18, which will be described later, and is attached to one side of the lower part of the outer frame 12. Incidentally, this motor 13 may also be equipped with a speed reducer or the like, if necessary.

18 is a cylindrical wire mesh drum, and the glass container 11
It is rotatably disposed through the closing plate 14 at the center of the block. Both open ends of the wire mesh drum 18 are closed with side plates 19, and a bearing 20 is inserted into the center of each side plate 19.

Reference numeral 21 denotes a pair of fixed shafts that support the wire mesh drums 18, one end of which is fixed to a support frame 22 attached to each cover plate 14, and the other end of which is fitted into a bearing 20.

A sleeve 23 is connected to one side plate 19 of the wire mesh drum 18, and a sprocket 24 is attached to the outer periphery of the sleeve 23. An endless chain 26 is wound around this sprocket 24 and a sprocket 25 attached to the motor 13, and the rotation of the motor 13 is controlled by the wire mesh drum 1.
8 can be transmitted.

A roasting heater 27 is installed on opposite ends of the pair of fixed shafts 21 and placed inside the wire mesh drum 18, so that it can heat the peripheral wall of the drum 18.

A pair of blades 28 are attached to the peripheral wall of the wire mesh drum 18, and are arranged close to the inner peripheral surface of the glass container 11 so as to be able to rotate together with the wire mesh drum 18.

FIG. 2 is an electrical circuit diagram of the heater control system of the roasting machine, in which 27 is the heater, 30
is a first resistor, 31 is a second resistor, 32 is a capacitor, 33 is a trigger element such as SBS, 34 is an AC switching element such as a triax, 35 is an AC power supply, 36 is a power switch, and 40 is a single pole. The double-throw type changeover switch 50 is a timer.

The first and second resistors 30 and 31 are used to set the heater power, respectively, and the second resistor 31 has a larger resistance value than the first resistor 30.

The AC switching element 34 is the trigger element 33
Trigger pulses 33a, 33b (Fig. 3c,
d) is input, it becomes conductive, becomes non-conductive at zero potential of the AC voltage waveform, and repeats this for each cycle.

The changeover switch 40 has one fixed contact 40a on the first resistor 30 side, and the other fixed contact 40a on the first resistor 30 side.
b on the second resistor 31 side, and the switching contact 40
c are connected to the heater 27 side, and the switching contact 40c is normally in contact with the fixed contact 40a on the first resistor 30 side.

The timer 50 is for switching the changeover switch 40 based on the time from the start of roasting, and after a predetermined time has elapsed since the power switch 36 is turned on, the timer 50 switches the changeover contact 40c of the changeover switch 40 to the second resistor. It is possible to switch to the fixed contact 40b on the 31 side. The above-mentioned timer time is set based on the time (for example, 10 minutes) until the inside of the glass container 11 reaches the proper roasting temperature by heating the heater after turning on the switch.

In the above-mentioned roasting machine, after putting the coffee beans A into the glass container 11 through the inlet 15, the power switch 36 is turned on and the motor 13 is operated to start the roasting operation.

In the same state, the changeover contact 40c of the changeover switch 40
is on the side of the first resistor 30, which has a small resistance value, so the capacitor 3
The potential 32a of 2 quickly reaches the trigger level, and a trigger pulse 33a as shown in FIG. .

In other words, a large electric power defined by the first resistor 30 flows through the heater 27, and the coffee beans A, which are stirred by the rotation of the wire mesh drum 18 and the blade 28, are roasted by the heating of the heater 27.

When the inside of the glass container 11 reaches the proper roasting temperature by heating the heater, the timer 50 switches the roasting temperature after the time specified by the timer 50, for example 10 minutes, has elapsed since the power switch 36 was turned on. The switching contact 40c of the switch 40 is switched to the other fixed contact 40b (see FIG. 2).

In the same state, the changeover contact 40c of the changeover switch 40
is located on the side of the second resistor 31, which has a large resistance value, so as shown by the dashed line in FIG. A trigger pulse 33ba as shown in FIG. 3c is input to the AC switching element 34, and as a result, smaller power is supplied to the heater 27 than during roasting.

Therefore, in the above-mentioned roasting machine, a large amount of power can be supplied to the heater 27 until a predetermined time has elapsed from the start of roasting, as shown in FIGS. It takes less time to reach T1, and the roasting time can be shortened accordingly.

In addition, after reaching the appropriate roasting temperature T1, the heater 2
Since the power supplied to the heater 27 can be reduced, the time required to reach the roasting limit temperature T2 can be delayed or reduced compared to the case where a constant power is supplied to the heater 27 (see the dashed line in Fig. 4a). By eliminating this, abnormal heating of coffee beans A can be prevented and thermal damage thereof can be avoided.

Furthermore, since the amount of heat generated by the heater after reaching the appropriate roasting temperature T1 is small, the roasting temperature can be easily finely adjusted by blowing air.

Although the above embodiment shows that the changeover switch is switched by a timer, it is also possible to install a temperature sensor that detects the temperature inside the glass container and switch the changeover switch based on the detection signal from the temperature sensor. You can also do this.

(Effects of the invention) As detailed above, according to the invention, it is possible to set a large calorific value of the heating element at the beginning of roasting, thereby keeping the temperature inside the roasting container at a predetermined appropriate level. By shortening the time it takes to reach roasting temperature, the total roasting time can be shortened.

In addition, after the temperature inside the roasting container reaches the predetermined appropriate roasting temperature, the calorific value of the heating element can be reduced compared to the initial calorific value, so the temperature inside the roasting container can significantly exceed the appropriate roasting temperature. This prevents the roasted items from being abnormally heated, thereby preventing thermal damage to the roasted items and improving quality.

Moreover, since the calorific value of the heating element after reaching the appropriate roasting temperature is small, the roasting temperature can be easily finely adjusted by blowing air, and roasting can be performed at the appropriate roasting temperature.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention. Figure 1 is a sectional view of the roasting machine, Figure 2 is an electrical circuit diagram of the heater control system, and Figure 3a is an AC voltage diagram. FIG. 3b is a waveform diagram of the capacitor potential, FIG. 4a is a temperature graph in the roasting container, and FIG. 4b is a waveform diagram of the calorific value of the heating element. In the figure, 11...Glass container, 12...Outer frame, 1
4... Closure plate, 27... Heater, 30, 31... Resistor, 32... Capacitor, 33... Trigger element, 34... AC switching element, 40... Changeover switch, 50... Timer, A... ...coffee beans.

Claims (1)

[Scope of Claim for Utility Model Registration] In a roasting machine that roasts the object to be roasted in a roasting container by heating it with a heating element, the temperature in the roasting container is maintained at a predetermined appropriate temperature after the start of roasting. A roasting machine characterized by being provided with a calorific value control means that reduces the calorific value of the heating element from the initial calorific value when the roasting temperature is reached.