JPS5943083Y2 - electric sharpener - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electric sharpening machine for sharpening knives, etc. using a grindstone driven by a motor.

This type of sharpening machine is equipped with a main switch to start the motor, but in particular, small battery-powered household sharpening machines are designed to avoid wasteful consumption of current and to drive the whetstone at times other than when sharpening. In order to prevent unexpected accidents such as a child accidentally touching the switch and injuring itself, the switch has a self-returning property, so it stays on only while it is pressed, and turns off immediately when you release it. It is said to be an automatic return switch.

In this case, the grindstone is driven only while the operator consciously presses the switch, and the switch does not continue to be pressed when not in use or when it is unnecessary, so the above-mentioned problem is solved.

However, in order to perform sharpening work, one hand must press and operate the switch, and the other hand must hold the object to be sharpened, such as a kitchen knife, and push it back onto the whetstone, so both hands are used for different tasks. They are used at the same time, and in some cases, the hand operating the switch and the hand holding the object to be sharpened may cross each other, making the work difficult and difficult to deal with in case of an emergency.

The object of this invention is to provide an electric sharpening machine that can eliminate the above-mentioned conventional drawbacks.

To explain the embodiment shown in FIGS. 1 and 2,
1 is a main body, and a sharpening table part 2 is located on the right side of the first part on the top surface.
has.

In the sharpening table part 2, a whetstone 4 is located in a central hole 3, and the left and right sides of the whetstone 4 are inclined sharpening table surfaces 2a with slightly different angles.
, 2b, and the sharpening angle can be selected depending on which sharpening table surface the knife 5 or the like is pushed onto.

A motor 6 for driving the grindstone 4 is built into the main body 1, and the left side of the built-in portion of the motor 6 in FIG. 1 is a battery chamber 7 for housing a power source battery (not shown).

A safety cover 8 is provided above the grinding wheel 4 of the sharpening table section 2. The safety cover 8 is attached by attaching a stationary leg 8a on the lower surface of the rear edge to the rear of the sharpening table section 2, and a transparent plate 9 is fitted into the safety cover 8. It has a viewing window 10.

The whetstone 4 is removably fitted into the upper body 11a of the whetstone holder 11, and the holder upper body 11a is fitted vertically movably into the holder lower body 11a attached to the motor shaft 12 of the motor/-6. Holder upper body 1
1a upwardly.

The grindstone 4 is connected to a motor 6 so as to be able to move up and down and to have upward movement.

14 is a motor cover.

A microswitch 15 as a switching element for starting the motor 6 is fixed on a part of the upper surface of the motor cover 14, and is disposed on the outer periphery of the holder upper body 11a so as to face an actuator 15a of the microswitch 15. A flange-shaped switch operation part 16 is provided, and when the grindstone 4 and the holder upper body 11a are moved downward by the pushing force when pressing the object to be sharpened, such as a kitchen knife 5, against the grindstone 4,
The switch operating portion 16 is configured to push down the actuator 15a and turn on the microswitch 15.

As a result, only while the object to be sharpened is being pressed against the grindstone 4 for sharpening work, the microswitch 15 is dynamically turned on and the grindstone 4 is driven to perform the grinding work, and the object to be sharpened is pressed against the grindstone. When released from 4, the micro switch 15
The pushing action of the switch operation part 16 on the actuator 15a is immediately released and turned off by the return of the grindstone 4 button and the holder upper body 11a, and the motor 6 is stopped.

If the operation part 16 is rotatably held in the holder upper body 11a, friction with the actuator 15a can be reduced.

FIGS. 3 and 4 show a whetstone holder 11 holding a whetstone 4.
to the motor shaft 12 of the motor 6, and
The grindstone 4 and the grindstone holder 11 are held in a motor holder 22 which is fixed with screws 21 in the main body 1 so as to move up and down integrally, and a spring 23 provides upward movement.

Then, each movable contact piece 24 on the positive side and the negative side is attached to the motor 6.
25, and attach each movable contact piece 24 to the motor holder 22.
．． Positive side and negative side fixed contacts 26 and 27, which are connected to the power supply, are provided opposite to the grinding wheel 25, and the object to be sharpened is connected to the grinding wheel 4.
When performing sharpening work by pressing the motor 6 against the grinding wheel 4, each contact piece 24.25 and each contact point 26.27 are
This is a switching element that starts the motor 6 when it comes into contact with the motor 6, and utilizes a so-called brush connection function.

Reference numerals 28 and 29 are rotation-preventing engagement portions of the motor 6, which are provided on the motor 6 button and the motor holder 22.

Figures 5 and 6 show 1 a micro switch 1 on the inner bottom of the main body 1
5, the actuator 15a protrudes to the lower surface of the main body 1, and 1 telescopic legs 31 made of rubber or other material are provided on the lower surface of the main body 1. 32, but when the object to be sharpened is pressed against the grindstone, the main body 1 sinks while compressing the legs 31, and the actuator 15a comes into contact with the mounting surface 32 and is pushed, and the microswitch 15 is activated. It should be turned on to start the drive motor for the grinding wheel.

In FIG. 6, the actuator 15a of the microswitch 15 is placed inside the telescoping legs 31 so as to face the mounting surface 32, and the actuator is not visible from the outside, giving it a good appearance and making it difficult to be tampered with.

The telescoping legs 31 may have a mechanical telescoping structure.

FIG. 7 shows the microswitch 15 on the sharpening table surface 2 of the main body 1.
a, 2b, the actuator 15a is added to the bottom surface of the sharpening table surface 2.
a, 2b, and when the object to be sharpened is pressed against the grindstone 4, the actuator 15a is pushed to turn on the micro switch 15, and the switching element is directly operated by the object to be sharpened. Therefore, the structure is the simplest.

In FIG. 8, the movable guide table 41 is provided under a movable guide table 41 provided on the sharpening table surfaces 2a and 2b, and the movable guide table 41 is movable up and down, and is given upward movement by a lever spring 42 to move the guide surface 41a to the sharpening table surface 2a. , 2b, and when the object to be sharpened is pressed against the grindstone 4, the movable guide table 41 is moved down and pushes the actuator 15a of the micro switch 15, turning the switch 15 on. That's how it is.

This invention is characterized by the provision of a switching element that is turned on in response to the force of pressing the object to be sharpened against the grindstone and starts the grindstone drive motor.The specific structure of the element does not matter; The structure can also be modified in various ways.

It would be even safer if a power switch, which can be manually operated for both on and off, is provided in addition to the switching element in the housing.

According to this invention, the grindstone drive motor is started by a switching element that is turned on in response to the force of pressing the object to be sharpened against the grindstone.

To perform sharpening work, simply press the object to be sharpened against the whetstone, and the motor will automatically start and perform the sharpening work.
Sharpening work can be done easily with just one hand, and in the event of an emergency, you can immediately respond with the other hand.The motor will automatically start as soon as you release the object to be sharpened from the grindstone, which may interrupt or end the sharpening work. The grinding wheel is stopped, and the grinding wheel is not driven unnecessarily.
To extend the life of a battery even if the power source is a battery.

Encased, unused. Since the whetstone is not driven when it is not needed, there is no chance of a child touching the whetstone and causing an unexpected accident.

[Brief explanation of the drawing]

Fig. 1 is a front view of a part of one embodiment in cross section, Fig. 2 is an oblique view of the main part, Fig. 3 is a sectional view of the main part of another embodiment, and Fig. 4 is a sectional view of the main part of another embodiment.
The figure is a cross-sectional view, FIG. 5 is a partial front view of another embodiment, and FIG. 6 is a partial cross-sectional view of a modified example. FIG. 7 is a partial sectional view of another embodiment, and FIG. 8 is a partial sectional view of still another embodiment. 1...Main body, 2...Sharpening stand, 2a, 2
b... Cutting stand surface, 4... Grinding stone, 5...
... Knife, (object to be sharpened), 6 ... Motor, 1
1...Whetstone holder, 13°23.42...
・・Spring, 14 ・・・Momake cover 16・・・・
...Switch operation section, 15...Micro switch (motor start switching element), 15a...
... Actuator (motor start switching element), 24
．． 25...Movable contact piece (motor start switching element), 26, 27...Visiting contact (motor start switching element), 22...Motor holder, 31... ... Telescopic legs, 32 ... Placement surface, 41 ... Movable guide table.

Claims (9)

[Scope of utility model registration request] (1) A main body equipped with a grindstone and its drive motor is provided with a motor start switching element that is turned on in response to the force of pressing the shredded material against the grindstone, and when the switching element is turned on, the motor is driven. An electric sharpener characterized by having a motor that starts. (2) The electric sharpening machine according to claim 1, wherein the whetstone is arranged such that one end face faces the sharpening table surface on the upper surface of the main body and is driven around a vertical axis. (3) The electric sharpening machine according to claim 1 or 2, wherein the switching element directly receives the pressing force of the shredded object. (4) The electric sharpener according to claim 3, wherein the switching element is a microswitch. (5) The switching element is disposed under a switch operation of a grinding wheel holder which is connected to be vertically movable with respect to the motor shaft of the drive motor and has an upward movement behavior, and is arranged under a switch operation part of a grinding wheel holder, and is configured to provide a force for pressing the shredded object. The electric sharpening machine according to claim 4, wherein the grinding wheel holder moves downward together with the grinding wheel to push the actuator and turn it on. (6) The switching element is provided with its actuator protruding from the lower surface of the main body, and the legs of the main body are made of elastic material such as rubber, and the main body contracts the legs by the pressing force of the shredded object. 5. The electric sharpener according to claim 4, wherein the actuator is turned on by being pressed against the main body mounting surface when the electric sharpener sinks. (7) The switching element is disposed under a movable guide table which is provided on the surface of the sharpening table and is movable up and down and has an upward movement characteristic, and the movable guide table is moved downward by the pressing force of the shredded material. The electric sharpening machine according to claim 4, which is configured to be turned on by pushing the actuator. (8) The switching element includes a movable contact piece provided on a motor that is integrally connected to the grindstone so as to be able to move up and down and is provided with upward movement behavior, and a motor holder that guides the motor. A utility model consisting of a fixed contact that is firmly installed, and when the grinding wheel and motor move down together due to the pressing force of a shredded object, the movable contact piece contacts the fixed contact and turns on. An electric sharpening machine according to registered claim 3. (9) The electric sharpening machine according to claim 1 or 2, wherein the switching element is directly subjected to force when pressing the shredded object.