JP4164932B2 - Electric pencil sharpener - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric pencil sharpener equipped with an interlock mechanism for improving safety.
[0002]
[Prior art]
In general, in an electric pencil sharpener, the internal cutter portion is exposed when the shaving box is removed, and therefore an interlock mechanism is provided for safety.
[0003]
The interlock mechanism of a conventional electric pencil sharpener will be described below.
[0004]
FIG. 8 is a perspective view of a conventional electric pencil sharpener, and FIG. 9 is a cross-sectional view showing an interlock mechanism of the electric pencil sharpener.
[0005]
As shown in FIG. 8 and FIG. 9, there is a pencil insertion slot 2 on the front of the main case 1 of the electric pencil sharpener, and when a pencil is inserted from here, the internal switch lever 3 moves and the power switch button 4 is moved. When the contact plate 5 and the contact plate 6 are brought into contact with each other, the power is turned on, and the motor 7 rotates. The rotation of the motor 7 rotates the cutter holder 12 through the gears 8, 9, and 10, and the pencil is cut by the rotation of the cutter 11 provided in the cutter holder 12. Reference numeral 13 in the figure denotes a spring for biasing the switch lever 3.
[0006]
Since the cutter holder 12 includes the cutter 11, it is dangerous in an exposed state. Therefore, the front side of the cutter holder 12 is covered and protected by a shaving box 14 attached to the main body case 1. Yes. In other words, when the receiving box 14 is not attached and the cutter holder 12 can be touched, an interlock mechanism is provided in which the power is not turned on even if a pencil is inserted.
[0007]
The interlock mechanism is specifically configured as shown in FIG. 9, that is, when the receiving box 14 is mounted on the main body case 1, the switch lever 3 is fixed to the receiving box 14 with screws 15. The position is restricted by the rib 17 projecting from the receiving box knob 16 so that it does not escape in the direction a. When the pencil is inserted, the switch lever 3 is pressed on the end face of the rib 17 and the power switch button 4 is pressed to turn on the power. However, if the receiving box 14 is removed from the main body case 1, the position restriction by the rib 17 is lost, and the switch lever 3 escapes in the direction a with the point b as a fulcrum, and the power switch button 4 can be pushed in. The power is turned off and the cutter 11 stops rotating.
[0008]
[Problems to be solved by the invention]
However, in the configuration of the above conventional interlock mechanism, the switch lever 3 is directly pressed by the rib 17 of the receiving box knob 16 fixed to the receiving box 14 with the screw 15, so that the receiving box 14 and the receiving box knob 16 are also pressed. The shape of the receiving box 14 must be expanded to the position of the switch lever 3, and the receiving box 14 and the receiving box knob 16 become larger in shape, which is restricted in terms of design, resulting in problems such as an increase in part cost and part accuracy. It was.
[0009]
Therefore, the present invention pays attention to the above-mentioned conventional problems, reduces the cost by reducing the number of parts of the receiving box, and is provided with an interlock mechanism that is functionally stable and reduced in size and design. An object is to provide an electric pencil sharpener.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention releases the contact plate position restriction by rotating the safety switch lever with the lever operating rib formed on the receiving box with the receiving box attached to the main body case. Return the safety switch lever to the normal position by the elastic force of the contact plate itself, bring the two contact plates into contact with each other by inserting the pencil, turn on the power, drive the motor, cut the pencil, In the detached state, the contact plate is moved and locked by the safety switch lever that is pushed up by the spring, ensuring a contact distance that prevents the two contact plates from contacting each other even when the pencil is inserted. It is to be turned off.
[0011]
According to the present invention, it is possible to reduce the cost by reducing the number of parts of the receiving box, and to reduce the size, widen the design, and provide an electric pencil sharpener equipped with a functionally stable interlock mechanism. it can.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a motor, a cutter that is driven by the motor to rotate, and a cutter that is provided in front of the cutter and moves up and down when a pencil is inserted to move the contact plate and turn the power ON / OFF. A power switch case with a safety switch lever held by a power switch button and a spring, a main body case for storing the motor, cutter, power switch case, etc., and a front side of the main body case are detachably mounted. And a receiving plate having a lever operating rib protruding rearward, the safety switch lever is rotated by the lever operating rib of the receiving box while the receiving box is mounted on the main body case, and the contact plate The position restriction is canceled, the contact plate is returned to the normal position by the elastic force of the contact plate itself, and the two contact plates are moved by the power switch button by inserting the pencil. Touch the power ON state, remove the receiving box, rotate the safety switch lever back by pressing the spring to lock the contact plate, and the contact interval where the two contact plates do not contact even when the pencil is inserted This is an electric pencil sharpener that ensures power supply and is turned off, and a receiving box with an interlock mechanism can be configured with a reduced number of parts, thus reducing the cost of parts, expanding its design, and making it stable The interlock operation can be performed.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
(Embodiment 1)
1 is a perspective view of an electric pencil sharpener according to Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view of the electric pencil sharpener, and FIG. 3 is a diagram of a power switch case when a receiving box is mounted in the electric pencil sharpener. 4 is a partially cutaway sectional view, FIG. 4 is a perspective view of a receiving box of the same electric pencil sharpener, FIG. 5 is a partially cutaway sectional view of a power switch case when the receiving box is installed in the electric pencil sharpener and when a pencil is inserted, 6 is a partially cutaway sectional view of the power switch case when the receiving box is removed, and FIG. 7 is a partially cutaway sectional view of the power switch case when the receiving box is removed and the pencil is inserted in the electric pencil sharpener. .
[0015]
As shown in FIG. 1, the main body case 18 includes a pencil insertion opening 19 on the front surface, and a receiving box 20 for collecting shavings is detachably attached to the main body case 18. In the figure, reference numeral 21 denotes a power cord led out from the main body case 18, and a power supply plug 22 is connected to the tip thereof.
[0016]
As shown in FIG. 2, a cutter holder 23 and a cutter 24 held by the cutter holder 23 are provided inside the main body case 18 and at a position corresponding to the pencil insertion opening 19. A motor 25 is disposed inside the main body case 18, and its rotation is transmitted to the cutter holder 23 via gears 26, 27 and 28.
[0017]
As shown in FIG. 3, a power switch case 29 is provided on the side of the pencil insertion opening 19 in the main body case 18, and a power supply extending to the pencil insertion opening 19 is provided inside the power supply switch case 29. The switch button 30, the rib 31 serving as a stopper when the power switch button 30 is moved upward, the contact plate B32 in contact with the upper end of the power switch button 30, and a state in which the distance between the contact plate B32 is kept constant The contact switch A34 that is locked at the pivot 33 and pivotally moved with the rib 33 as a fulcrum, and the safety switch that has the relationship of rotationally moving with the boss 35 provided inside the power switch case 29 as a fulcrum and regulating the position of the contact plate A34 A lever 36 is provided. The safety switch lever 36 is urged upward by a spring 37 provided on the left side.
[0018]
As shown in FIG. 4, the receiving box 20 has a lever operating rib 38 protruding rearward from the side of the front plate. The lever operating rib 38 allows the receiving box 20 to be connected to the main body case. When mounted on the safety switch lever 18, the safety switch lever 36 is rotated counterclockwise with the boss 35 as a fulcrum.
[0019]
In the above configuration, when the receiving box 20 is mounted on the main body case 18 as shown in FIG. 3, the end of the safety switch lever 36 comes into contact with the lever operating rib 38 of the receiving box 20 so that the boss 35 is It rotates counterclockwise as a fulcrum and releases the position restriction of the contact plate A34, and the contact plate A34 returns the rib 33 to the normal position by the fulcrum and its own elastic force.
[0020]
When the pencil 39 is inserted through the insertion port 19 as shown in FIG. 5, the power switch button 30 is pushed upward by the pencil 39, so that the contact plate B32 and the contact plate A34 come into contact with each other to turn on the power. 25 rotates. This rotation is transmitted to the cutter holder 23 through the gears 26 to 28, and the pencil 39 is cut by the cutter 24.
[0021]
As shown in FIG. 6, when the receiving box 20 is removed from the body case 18, there is no lever operating rib 38 of the receiving box 20 that has locked the safety switch lever 36. The spring force of 37 rotates the boss 35 clockwise as a fulcrum, and the contact plate A34 is pushed up and locked at its left end.
[0022]
Even if the pencil 38 is inserted in this state as shown in FIG. 7, the power switch button 30 is restricted by the rib 31 so that the contact plate B <b> 32 and the contact plate A <b> 34 do not contact each other. It becomes possible to keep a certain interval, and the motor 25 does not rotate because the power is turned off.
[0023]
Thus, even if the pencil 39 is inserted with the receiving box 20 removed from the main body case 18, the cutter 24 does not rotate, so that an extremely safe electric pencil sharpener can be obtained.
[0024]
【The invention's effect】
As is clear from the above explanation, the present invention is such that the safety switch lever widens the contact distance between the two contact plates in a state where the receiving box for receiving shavings is removed from the main body case, and even if a pencil is inserted, Since it is configured to ensure a certain contact interval such that the contact plate does not contact, even if a pencil is inserted in the state where the receiving box is removed from the main body case, the power is not turned on, Therefore, a safe electric pencil sharpener that does not rotate the cutter can be obtained. In addition, since the receiving box knob and the switch lever having the protrusions fixed to the receiving box with screws can be eliminated, the number of parts can be reduced and the cost can be reduced. Further, by eliminating the receiving box knob, the design width of the receiving box can be widened, and the shape can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of an electric pencil sharpener according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the electric pencil sharpener. FIG. 3 is a power switch case when a receiving box is attached to the electric pencil sharpener. FIG. 4 is a perspective view of a receiving box of the electric pencil sharpener. FIG. 5 is a partially cutaway cross section of a power switch case when the receiving box is installed and a pencil is inserted in the electric pencil sharpener. Fig. 6 is a partially cutaway sectional view of the power switch case when the receiving box is removed. Fig. 7 is a partially cutaway sectional view of the power switch case when the receiving box is removed and the pencil is inserted in the electric pencil sharpener. FIG. 8 is a perspective view of a conventional electric pencil sharpener. FIG. 9 is a cross-sectional view showing an interlock mechanism of the electric pencil sharpener.
18 Body case 19 Pencil insertion slot 20 Receiving box 21 Power cord 22 Power supply plug 23 Cutter holder 24 Cutter 25 Motor 26 Gear 27 Gear 28 Gear 29 Power switch case 30 Power switch button 31 Rib 32 Contact plate B
33 Rib 34 Contact plate A
35 Boss 36 Safety switch lever 37 Spring 38 Lever for actuating lever 39 Pencil

Claims (1)

A motor, a cutter driven and rotated by the motor, and a safety provided by a power switch button and a spring, which is provided in front of the cutter and moves up and down when a pencil is inserted to move the contact plate to turn on / off the power. A power switch case provided with a switch lever, a main body case for housing the motor, cutter, power switch case, etc., and a lever operating rib that is detachably attached to the front side of the main body case and protrudes rearward. In the state where the receiving box is mounted on the main body case, the safety switch lever is rotated by the lever operating rib of the receiving box, the position restriction of the contact plate is released, and the elasticity of the contact plate itself The contact plate is returned to the normal position by force, and when the pencil is inserted, the two contact plates come into contact with the power switch button and the power is turned on. With the spring removed, the safety switch lever is rotated and restored by pressing the spring, and the contact plate is locked, so that the contact distance between the two contact plates does not contact even when the pencil is inserted, and the power is turned off. An electric pencil sharpener.

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