JP2906219B2 - Coffee maker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coffee maker having improved power transmission means for transmitting rotation of a roasting motor to a stirring blade.

[0002]

2. Description of the Related Art Many conventional coffee makers have a roasting function for roasting coffee beans, a mill function for grinding coffee beans, a drip function for extracting coffee from ground coffee beans, and the like. Various coffee makers have been proposed that can automatically perform everything from roasting beans to extracting coffee.

[0003] Further, in the above-mentioned conventional coffee maker, a stirring blade for stirring beans to be roasted is provided at the bottom of the roasting pot, and the stirring blade is rotated by a roasting motor provided in the main body. Between the roasting motor and the stirring blade, for example, Japanese Utility Model Laid-Open No. 1-140294,
JP-A-2-37026, JP-A-2-237519
Gazette, Japanese Unexamined Patent Publication No. Hei 3-251212, Japanese Utility Model Laid-Open Gazette
As already disclosed in, for example, Japanese Patent No. 5996, etc., they are connected via a power transmission means composed of a pair of springs.

That is, in the conventional power transmission means, as shown in FIG. 1, a stirring blade c is attached to an upper end of a rotating shaft b rotatably supported on a bearing a, and an elastic blade is provided at a lower end of the rotating shaft b in a rotating direction. And one of a pair of coil springs d and e having

A roasting motor g is provided below the rotating shaft b so that the center of the driving shaft f coincides with the rotating shaft b. A spring e is mounted, and an end e 'of the coil spring e projects horizontally,
When the end d 'of the coil spring d attached to the rotating shaft b is bent into an inverted L-shape, the end of the roasting motor g is rotated via the coil springs e and d. The rotation is transmitted to the rotating shaft b of the stirring blade c.

[0006]

However, in a coffee maker employing the above-described conventional power transmission means comprising a pair of coil springs d and e, heat transmitted to the rotating shaft b from the stirring blade c during roasting of coffee beans. Roasting motor g through coil springs d and e made of metal having high thermal conductivity
, The temperature of the roasting motor g becomes high, and the performance of the roasting motor g is reduced at an early stage, and the roasting motor has a short life. The present invention has been made in order to improve such a problem, and an object of the present invention is to provide a coffee maker having power transmission means that significantly reduces the transmission of heat on the stirring blade side to the roasting motor side. Things.

[0007]

In order to achieve the above object, the present invention provides a roasting pot provided in a main body, a heater for heating coffee beans to be roasted, and a stirrer for heating the coffee beans. In a coffee maker in which a stirring blade is provided and the rotating shaft on which the stirring blade is mounted is rotatably driven by a roasting motor via a power transmission device, the power transmission means is provided at a lower end of the rotation shaft. It comprises a spring pin mounted substantially horizontally, and a drive member mounted on the drive shaft of the roasting motor and having a drive unit engaged with the spring pin.

[0008]

The heat transmitted to the rotary shaft during roasting by the above configuration is less likely to be transmitted to the roasting motor side due to the heat radiation effect of the rotating spring pin and the heat insulating effect of the drive member made of synthetic resin. The roasting motor is not heated by the heat generated during roasting.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. In FIG. 2, reference numeral 1 denotes a main body of a coffee maker, and a roasting pot 2 having an upper surface opened at the upper portion of a case 1a is provided. The opening of the roasting pot 2 is covered by a lid 4 having a knob 3. ing. The lid 4 is provided with an exhaust port 4a for discharging smoke generated during roasting, and a catalyst 5 is provided inside the exhaust port 4a. Further, a roasting heater 7 for heating the coffee beans housed in the roasting pot 2 is provided at an upper portion in the roasting pot 2, and a stirring blade 8 for stirring the coffee beans is provided at a bottom portion. The stirring blade 8 is composed of a pair of coil springs projecting horizontally from the upper end of a rotating shaft 10 rotatably supported by a bearing 9, and a hemispherical nut 10 is provided on the upper end of the rotating shaft 10.
a is screwed. The lower end of the rotating shaft 10 projects into a motor housing 1 b provided in the main body 1.

A drive shaft 1 is provided in the motor housing 1b.
A roasting motor 12 is installed so that 2a coincides with the center of the rotating shaft 10. A driving member 13 integrally formed of a heat-resistant synthetic resin is attached to a tip of a driving shaft 12a of the roasting motor 12. I have. The driving member 13 is shown in FIG.
And the drive shaft 12a of the roasting motor 12 as shown in FIG.
A fitting portion 13b having a fitting hole 13a fitted into the fitting portion 13b, and a flat driving portion 13 protruding from an outer peripheral portion of the fitting portion 13b.
The drive unit 13c is provided so as to be eccentric with respect to the center of the rotating shaft 10. And this driving unit 13
c is a spring pin 14 fitted to the lower end of the rotating shaft 10
To be engaged from below. As shown in FIG. 4, the spring pin 14 is formed by winding a thin stainless plate having a corrugated end as an elongated pin by meshing the ends with each other, and has elasticity in a radial direction.
The rotary shaft 10 is press-fitted horizontally into a pin hole 10b formed at the lower end.

On the other hand, a discharge port 2a for discharging roasted coffee beans into the mill case 1c is opened on the outer periphery of the bottom of the roasting pot 2, and the discharge port 2a is opened and closed by a solenoid 15. An opening / closing plate 16 is provided.

The discharge port 2a and the inside of the mill case 1c are communicated by a passage 1d.
A mill cutter 16 is provided on the inner bottom of the. The mill cutter 16 is provided on the upper end side of a rotating shaft 16b having a blade nut 16a at the upper end.
The lower end of b is connected to the rotating shaft 20a of the mill motor 20 via a joint 17 and a pin 18, so that the mill cutter 16 is rotated at a high speed by the mill motor 20. In FIG. 3, reference numeral 22 denotes a locking ring for preventing the rotating shaft 10 from coming off.

Next, the operation of the coffee maker constructed as described above will be described. The lid 4 of the roasting pot 2 is opened, a predetermined amount of coffee beans is put into the roasting pot 2, and a switch (not shown) is turned on. Then, the roasting motor 12 starts rotating, and the heater 7 is energized to heat the coffee beans in the roasting pot 2. The driving member 13 is rotated by the rotation of the roasting motor 12, and the rotating shaft 10 is rotated in a certain direction via a spring pin 14 that engages with the driving portion 13 c of the driving member 13, thereby attaching to the rotating shaft 10. Since the agitating blades 8 agitate the coffee beans in the roasting pot 2, the roasting can be performed evenly. In addition, the stirring blade 8 and the nut 10a are heated during roasting, and this heat reaches the lower end side of the rotating shaft 10, but the spring pin 14 provided at the lower end of the rotating shaft 10 has an axially corrugated outer circumferential surface. It has a slit 14a, and this slit 14a
Most of the heat is radiated in this part because it is cooled by the air flowing through.

The remaining heat reaches the driving member 13 from the spring pin 14, but since the driving member 13 is formed of a heat-resistant synthetic resin having much higher heat insulating property than metal,
The heat of the rotating shaft 10 is hardly transmitted to the drive shaft 12a of the roasting motor 12 by being insulated by the driving member 13, so that the roasting motor 12
Is not heated.

On the other hand, when the roasting of the coffee beans is completed after a lapse of a predetermined time, the opening / closing plate 16 is opened by the solenoid 15 and the roasted coffee beans fall into the mill case 1c through the passage 1d from the discharge port 2a. And mill cutter 1
6 starts comminution. The operation after the mill is the same as the conventional operation, and a description thereof will be omitted.

[0016]

As described in detail above, the present invention provides a rotatable motor provided with a spring pin at the lower end of a rotating shaft provided with stirring blades, and a drive member made of heat-resistant synthetic resin provided on a drive shaft of a roasting motor. Since the rotation of the roasting motor is transmitted to the rotating shaft via the driving member and the spring pin, the stirring blades and nuts are heated when roasting the coffee beans, and this heat is transmitted to the lower end of the rotating shaft. Also, the heat is hardly transmitted to the roasting motor due to the heat radiation effect of the rotating spring pin and the heat insulation effect of the drive member made of synthetic resin. As a result, the roasting motor is not heated to a high temperature by the heat during roasting, so that problems such as the performance of the roasting motor being reduced at an early stage and the life shortening can be solved. In addition, since it has a simple structure including the spring pin and the driving member, it can be easily manufactured and assembled, and can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory view of power transmission means provided in a conventional coffee maker.

FIG. 2 is a sectional view of a coffee maker according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of power transmission means provided in a coffee maker according to one embodiment of the present invention.

FIG. 4 is an enlarged perspective view of power transmission means provided in a coffee maker according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Roasting pot 7 Heater 8 Stirrer blade 10 Rotary shaft 12 Roasting motor 12a Drive shaft 13 Drive member 13c Drive unit 14 Spring pin

Claims (1)

(57) [Claims] 1. A roasting pot 2 provided in a main body 1 is provided with a heater 7 for heating coffee beans to be roasted, and a stirring blade 8 for stirring the heated coffee beans. In a coffee maker in which the rotatable shaft 10 attached to is rotatably driven by the roasting motor 12 via the power transmitting means, the rotatable shaft 10 is mounted substantially horizontally at the lower end of the rotating shaft 10 as the power transmitting means. Waves on the surface
Coffee maker, characterized by being configured from a drive member 13 which is engaged with the driving portion 13c attached to the spring pin 14 to the drive shaft 12a of the roasting motor 12 having a shape.