JPH08112209A - Coffee maker - Google Patents

Abstract

PURPOSE: To prevent the heat of the stirring blade side heated in roasting from being transmitted to the roasting motor side. CONSTITUTION: A roasting iron 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, while a rotary shaft 10 mounting the stirring blade 8 is rotatably driven through a power transmitting means by a roasting motor 12 in a coffee maker. Thus, the power transmitting means is composed of a spring pin 14 mounted approximately horizontally to the lower end of a rotary shaft 8 and a drive member 13 mounted to a drive shaft 12a of the roasting motor 12 and having a drive part 13c engaged with the spring pin 14. Thus, the heat transmitted from the stirring blade 8 to the rotary shaft 10 in the roasting is prevented from being transmitted to the roasting motor 12 side by the radiation effect of the rotating spring pin 14 and the adiabatic effect of the drive member 13 made of synthetic resin, so that the performance and life of the roasting motor 12 can be prevented from being degraded by the heat.

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 the rotation of a roasting motor to a stirring blade.

[0002]

2. Description of the Related Art Most conventional coffee makers have a roasting function for roasting coffee beans, a milling function for crushing coffee beans, a drip function for extracting coffee from crushed coffee beans, and the like. Various coffee makers have been proposed that can automatically perform all processes from roasting beans to extracting coffee.

Further, in the above conventional coffee maker, a stirring blade for stirring the 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 Publication No. 1-140294,
Japanese Utility Model Laid-Open No. 2-37026 and Japanese Patent Laid-Open No. 2-337519.
Japanese Unexamined Patent Publication No. 3-251212, Japanese Utility Model Publication No. 4-2.
As already disclosed in Japanese Patent Publication No. 5996, 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 by a bearing a, and an agitating blade is elastically attached to a lower end of the rotating shaft b in a rotating direction. One of a pair of coil springs d and e having a is attached.

A roasting motor g is provided below the rotary shaft b so that the center of the drive shaft f coincides with the rotary shaft b, and the other coil is attached to the drive shaft f of the roasting motor g. The spring e is attached, and the end e'of this coil spring e is projected in the horizontal direction,
By engaging the end portion d ′ of the coil spring d attached to the rotating shaft b, which is bent in an inverted L shape, with this end portion, the roasting motor g is rotated via the coil springs e and d. It is adapted to be transmitted to the rotating shaft b of the stirring blade c.

[0006]

However, in the coffee maker which employs the power transmission means composed of the pair of conventional coil springs d and e, the heat transmitted from the stirring blade c to the rotary shaft b during roasting of coffee beans is used. Is a roasting motor g through coil springs d and e made of a metal having high thermal conductivity.
Since the roasting motor g is heated to a high temperature, the performance of the roasting motor g is deteriorated early, and the life of the roasting motor g is short. 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 a power transmission means in which heat from the stirring blade side is significantly reduced from being transmitted to the roasting motor side. It is a thing.

[0007]

In order to achieve the above object, the present invention has a roasting pot provided in a main body, a heater for heating coffee beans to be roasted, and agitating the heated coffee beans. In a coffee maker in which a rotating blade to which the stirring blade is attached is driven to rotate by a roasting motor via a power transmitting means, the power transmitting means is provided at the lower end of the rotating shaft. It is composed of a spring pin mounted substantially horizontally and a drive member mounted on the drive shaft of the roasting motor and having a drive portion engaged with the spring pin.

[0008]

With the above structure, the heat transmitted to the rotary shaft during roasting is rarely transmitted to the roasting motor side due to the heat dissipation effect of the rotating spring pin and the heat insulating effect of the drive member made of synthetic resin. The heat generated during roasting does not heat the roasting motor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. In FIG. 2, reference numeral 1 denotes a coffee maker main body, and a roasting pot 2 having an open top is provided on an upper portion of a case 1a. The opening of the roasting pot 2 is covered with a lid 4 having a knob 3. ing. The lid 4 has 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 in the upper part of the roasting pot 2, and a stirring blade 8 for stirring the coffee beans is provided in the bottom part. The stirring blade 8 is composed of a pair of coil springs horizontally protruding from the upper end side of a rotating shaft 10 rotatably supported by a bearing 9, and a hemispherical nut 10 is provided at the upper end of the rotating shaft 10.
a is screwed on. Further, the lower end side of the rotary shaft 10 projects into the motor housing 1b provided in the main body 1.

The 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 rotary shaft 10, and a drive member 13 integrally formed of heat resistant synthetic resin is attached to the tip of the drive shaft 12a of the roasting motor 12. There is. The drive member 13 is shown in FIG.
And as shown in FIG. 4, the drive shaft 12a of the roasting motor 12
A fitting portion 13b having a fitting hole 13a for fitting with the fitting portion 13b, and a flat plate-shaped drive portion 13 protruding from the 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 rotary shaft 10. And this drive unit 13
c is a spring pin 14 fitted to the lower end of the rotary shaft 10.
Is engaged from below. As shown in FIG. 4, the spring pin 14 is a thin thin plate formed by winding a stainless thin plate whose ends are corrugated so that the ends engage with each other, and has elastic properties in the radial direction.
It is horizontally press-fitted into a pin hole 10b formed at the lower end of the rotary shaft 10.

On the other hand, on the outer periphery of the bottom of the roasting pot 2, a discharge port 2a for discharging roasted coffee beans into the mill case 1c is opened, 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 with each other by a passage 1d, and at the same time, the mill case 1c.
A mill cutter 16 is provided on the inner bottom portion of the. The mill cutter 16 is provided on the upper end side of a rotary shaft 16b having a blade nut 16a on the upper end, and
The lower end of b is connected to the rotary shaft 20a of the mill motor 20 via a joint 17 and a pin 18, and the mill motor 20 rotates the mill cutter 16 at high speed. Reference numeral 22 in FIG. 3 denotes a locking ring that prevents the rotary shaft 10 from coming off.

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 drive member 13 is rotated by the rotation of the roasting motor 12, and the rotary shaft 10 is rotated in a fixed direction via the spring pin 14 that engages with the drive portion 13c of the drive member 13, thereby attaching to the rotary shaft 10. Since the stirring blade 8 thus stirred stirs the coffee beans in the roasting pot 2, it can be roasted without unevenness. Further, 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 a wavy shape in the axial direction on the outer peripheral surface. The slit 14a is provided, and the slit 14a is provided as the rotary shaft 10 rotates.
Most of the heat is dissipated 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 made of heat-resistant synthetic resin having a much higher heat insulating property than metal,
The heat of the rotary shaft 10 is hardly transferred to the drive shaft 12a of the roasting motor 12 by being insulated from heat by the drive member 13, whereby the roasting motor 12 is heated by the heat during roasting.
Is never heated.

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

[0016]

As described in detail above, according to the present invention, a spring pin is provided at the lower end of a rotary shaft provided with a stirring blade, and a drive member made of heat-resistant synthetic resin is provided at the drive shaft of a roasting motor. Since the rotation of the roasting motor is transmitted to the rotary shaft via the drive member and the spring pin, the stirring blades and nuts are heated during the roasting of coffee beans, and this heat is transmitted to the lower end of the rotary shaft. However, due to the heat dissipation effect of the rotating spring pin and the heat insulation effect of the drive member made of synthetic resin, it is hardly transmitted to the roasting motor side. As a result, the roasting motor is not heated to a high temperature by the heat during roasting, so that it is possible to solve problems such as early deterioration of the performance of the roasting motor and shortening of the service life. Further, since the spring pin and the driving member have a simple structure, they can be easily manufactured and assembled at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram 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 cross-sectional view of the power transmission means provided in the coffee maker according to the embodiment of the present invention.

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

[Explanation of symbols]

 1 Main Body 2 Roasting Pot 7 Heater 8 Stirring Blade 10 Rotating Shaft 12 Roasting Motor 12a Drive Shaft 13 Drive Member 13c Drive Part 14 Spring Pin

Claims (2)

[Claims] 1. A roasting pot 2 provided inside 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, and the stirring blades 8 are also provided. In a coffee maker in which the rotating shaft 10 attached to the rotating shaft 10 is rotationally driven by the roasting motor 12 via the power transmitting means, the power transmitting means is attached to the lower end of the rotating shaft 8 substantially horizontally. Pin 1
4 and a drive member 13 mounted on the drive shaft 12a of the roasting motor 12 and having a drive portion 13c engaged with the spring pin 14. 2. The coffee maker according to claim 1, wherein the drive member 13 is made of a heat-resistant synthetic resin.