JPS635918Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric pencil sharpener and its switch mechanism.

Its structure is such that the contact piece that moves when the pencil is inserted and the contact piece that moves when the shavings case is attached are formed by a single approximately U-shaped contact piece, and the ends of both contact pieces are located near the contact piece. The purpose of this invention is to provide a more excellent switch mechanism by making it possible to contact each of a pair of terminals arranged on a printed circuit board.

The present invention will be described below in detail with reference to the drawings. Reference numeral 1 denotes a pencil sharpener main body, which is composed of a substantially cylindrical cutting section 2 and a substantially rectangular parallelepiped-shaped power drive section 3. A charging plug P, a step-down transformer T, a rectifying diode D, a rechargeable battery B, a protective resistor R, a light emitting diode LED, and a driving motor M are housed inside the power supply drive unit 3, and the light emitting diode
The LED is mounted on the printed circuit board 4 which is mounted on the upper surface of the electric motor M and connects the aforementioned electrical components, and its transmitted light can be recognized through the display window 5 attached to the upper surface of the power supply drive section 3. It's closed.

On the other hand, the cutting part 2 has a cap 7 having a pencil insertion hole 6 formed therein mounted and fixed thereon, and inside the cutting part 2 is a blade holder 9 facing the pencil insertion hole 6 and equipped with a cutting blade 8. is installed vertically, and the blade holder 9
is rotationally driven by the electric motor M via gears 10, 10, .

Inside the mouthpiece 7, inner lids 11, 11 are provided which open when a pencil is inserted and are always biased inward by a spring. A hollow switch chamber 12 is formed between the cap 7 and the cutting section 2, and a starting switch that moves outward when a pencil is inserted and is always biased inward by a spring is provided in the switch chamber 12.
SW ₁ and a safety switch SW ₂ that moves inward when the shavings case 13 is attached are provided, and the start switch SW ₁ and the safety switch SW ₂ are connected to both arms of the substantially U-shaped elastic contact piece 14, respectively. It comes into contact with the part.
Further, both ends of the elastic contact piece 14 face a pair of terminals 15 and 16 provided on the printed circuit board 4,
The start switch SW ₁ and the safety switch SW ₂
It can be contacted freely by pressing the button.

Next, the operation of the present invention will be explained. When the shavings case 13 is attached to the main body 1, one arm of the elastic contact piece 14 moves inward due to the pressure of the safety switch SW ₂ and connects with the terminal 15. When they make contact, the safety switch SW ₂ turns ON. Then, insert a pencil into the pencil insertion hole 6, and insert the pencil into the inner lid 11, 11.
When the start switch SW 1 is opened and reached the start switch SW ₁ , the other arm of the elastic contact piece 14 moves outward due to the pressure of the start switch SW ₁ and comes into contact with the terminal 16, causing the start switch SW 1 to reach the start switch SW1. ₁ is turned on, the electric motor M is driven, and at the same time, the blade holder 9 rotates and the cutting blade 8 sharpens the pencil. Furthermore, when cutting is completed, the cutting completion switch is activated.
SW ₃ closes and the light emitting diode LED lights up,
Show completion status.

As described above, the present invention provides an unprecedented switch mechanism by providing the contacts of the start switch and safety switch on the terminals provided on the printed circuit board so that they can be contacted freely, and also because the distance between the two switches is large. Good effects such as being able to prevent the pencil sharpener from inadvertently starting due to the attenuation of the elastic force of the elastic contact piece can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a pencil sharpener main body according to an embodiment of the present invention, FIG. 2 is a vertical sectional view, FIG. 3 is a top cross-sectional view, and FIG. 4 is a circuit diagram. SW ₁ ... Start switch, SW ₂ ... Safety switch, 14... Elastic contact piece, 15, 16... Terminal.

Claims (1)

[Scope of utility model registration request] The main body case is formed of a cutting part and a power drive part, and the cutting part is provided with a switch chamber and a rotatable blade holder equipped with a cutting blade below the switch chamber, and the power drive part is provided with a rotatable blade holder for driving the blade holder. In an electric pencil sharpener that houses electrical components such as a motor, a rechargeable battery, a step-down transformer, and a charging plug, a printed circuit board is placed on the top surface of the motor to connect the electrical components in the drive section. , a substantially U-shaped elastic contact piece is attached to the switch chamber, one end of which is a switch contact piece that moves when a pencil is inserted, and the other end of which is a switch contact piece that moves when a shavings case is attached; An electric pencil sharpener characterized in that both ends thereof are capable of freely contacting a pair of terminals arranged on the printed circuit board.