JP6490028B2 - Electric pencil sharpener - Google Patents

Description

  The present invention relates to an improved electric pencil sharpener.

  Patent Document 1 shows a pencil sharpener having a first pencil sharpening unit in which a cutter is rotated by electric power and a second pencil sharpening unit that sharpens a pencil with a fixed blade when the pencil is manually rotated. There is something to be done.

Utility model registration No. 3112225

  If a pencil with a relatively soft core, such as a colored pencil, is sharpened with an electric rotary blade, the core often breaks.

  If the second pencil sharpener of Patent Document 1 is rotated electrically, it is possible to appropriately sharpen a pencil with a soft core.

  However, when two pencil sharpeners that are simply driven by a motor are provided, it may be possible to insert two pencils into the pencil sharpener at the same time. An excessive burden is imposed on the motor and the driving force transmission mechanism.

  Two pencil sharpeners are driven by separate motors or driven by a single motor, but if the motor and driving force transmission mechanism have redundancy that can withstand such a burden, However, it is not practical from the viewpoint of minimizing the number of parts constituting this type of electric pencil sharpener, from the viewpoint of simplifying the mechanism, from the viewpoint of reducing the weight, and being able to be supplied at low cost.

  The main problem to be solved by the present invention is that, in this type of electric pencil sharpener, a first cutting means having a rotary blade and a second that can appropriately sharpen a relatively soft pencil such as a colored pencil. A mechanism for receiving the pencil to be cut only in one of the first cutting means and the second cutting means while simultaneously driving the cutting means with a single built-in motor, that is, an electric pencil sharpener. The reason is to provide a mechanism for limiting the number of pencils that can be inserted at one time to one.

In order to achieve the above object, in the present invention, an electric pencil sharpener has a casing provided with a first insertion hole and a second insertion hole for a pencil at the front part,
A first position where the first insertion hole is opened and the second insertion hole is closed outside the casing, and a second position where the second insertion hole is opened and the first insertion hole is closed. An operation body provided to be movable between
A first cutting means in the casing for cutting the one end of the pencil inserted from the first insertion hole;
A second cutting means in the casing for cutting the one end of the pencil inserted from the second insertion hole;
The first cutting means is supported in the casing so as to substantially follow the center of rotation in the front-rear direction and receives a pencil end, and is rotatably supported by the base and the base. A rotating blade for cutting the one end of the pencil that is rotated with the rotation and received in the base,
The second cutting means is supported in the casing so as to substantially follow the center of rotation in the front-rear direction and receives a pencil end, and is fixed to the base and rotates with the base. A fixed blade that cuts one end of the pencil received in the base.
The base of the first cutting means and the base of the second cutting means are simultaneously rotated by driving a motor built in the casing.

 According to such an electric pencil sharpener, the second cutting means can appropriately sharpen a pencil with a relatively soft core such as a colored pencil without using human power. The first cutting means and the second cutting means are simultaneously driven by a single built-in motor, and the pencil to be cut by the operating body is placed on either the first cutting means or the second cutting means. In the cutting of the pencil, the motor and its driving force transmission mechanism are not overburdened.

  The operating body is attached to the outside of the casing so as to be rotatable about a position between the first insertion hole and the second insertion hole and is eccentric with respect to the rotation center. The second insertion hole is closed at the first position where the introduction opening communicates with the first insertion hole, and the introduction opening communicates with the second insertion hole. One preferred embodiment of the present invention is a rotating operation body configured to close the first insertion hole in the position.

  According to this invention, the electric pencil sharpener has a single built-in first cutting means having a rotary blade and a second cutting means capable of appropriately sharpening a relatively soft pencil such as a colored pencil. It is possible to insert the pencil to be cut into only one of the first cutting means and the second cutting means at the same time, that is, the electric pencil sharpener at the same time. It is possible to rationally provide a mechanism for limiting the number of pencils to one.

FIG. 1 is a perspective view of an electric pencil sharpener (first example) according to an embodiment of the present invention, and the rotating operation body is in a first position. FIG. 2 is a perspective view of the electric pencil sharpener (first example), and the rotating operation body is in the second position. FIG. 3 is an exploded perspective view of the electric pencil sharpener (first example). FIG. 4 is a rear view of the rotating operation body. FIG. 5 is a fragmentary cutaway configuration diagram of the electric pencil sharpener (first example). FIG. 6 is a perspective view of the second cutting means. FIG. 7 is a perspective view of the first cutting means. FIG. 8 is a perspective view of the electric pencil sharpener (second example) according to the embodiment of the present invention, and the slide operation body is in the first position. FIG. 9 is a perspective view of the electric pencil sharpener (second example), and the slide operation body is in the second position.

  Hereinafter, typical embodiments of the present invention will be described with reference to FIGS. The electric pencil sharpener according to this embodiment includes a first cutting means 2 having a rotary blade 2d and a second cutting means 3 capable of appropriately sharpening a relatively soft pencil P such as a colored pencil. A mechanism is provided that allows the pencil P to be cut to be received only by one of the first cutting means 2 and the second cutting means 3 while being driven simultaneously by a single built-in motor 4. Yes.

  Reference numeral 1 in FIG. 5 denotes a casing constituting the outer shell of the pencil P sharpener. In FIG. 5, reference numeral 2 denotes the first cutting means, reference numeral 3 denotes the second cutting means, and reference numeral 4 denotes a motor built in the casing 1.

  A first insertion hole 1 a and a second insertion hole 1 b for the pencil P are formed in the front portion 1 c of the casing 1.

  In the illustrated example, the motor 4 is built in the left side of the casing 1 in the middle in the left-right direction. The first insertion hole 1a and the second insertion hole 1b are formed on the right side of the casing 1 in the middle in the left-right direction and on the upper side in the middle of the vertical direction. The first cutting means 2 and the second cutting means 3 are arranged in the casing 1 behind the first insertion hole 1a and the second insertion hole 1b. On the right side of the casing 1 in the middle in the left-right direction and on the lower side in the middle of the middle in the vertical direction, a drawer 5 with an upper surface opening is housed so as to be able to be pulled out forward. The shavings generated from the means 2 and the second cutting means 3 are stored in the drawer 5.

  An operating body is provided outside the casing 1. The operating body opens the first insertion hole 1a and closes the second insertion hole 1b, and opens the second insertion hole 1b and closes the first insertion hole 1a. It is possible to move between the second position and the operating body so that the pencil P to be cut is received only by one of the first cutting means 2 and the second cutting means 3. It has become.

  In the first example of the electric pencil sharpener shown in FIGS. 1 to 7, the front portion 1 c of the casing 1 is formed with a projecting portion 1 d having a short cylindrical shape. A through hole 1e is formed at the center of the protruding portion 1d. The first insertion hole 1a is formed on a virtual horizontal line x (see FIG. 3) passing through the center of the protruding portion 1d and on the left side of the center. The second insertion hole 1b is formed on the horizontal line x passing through the center of the protrusion 1d and on the right side across the center. The upper side of the protruding portion 1d across the horizontal line x is configured to have a larger outer diameter than the lower side of the protruding portion 1d, so that the protruding portion 1d is located on the horizontal line x on the side of the protruding portion 1d. Steps 1f directed downward are formed on the left and right sides of the projecting portion 1d. In addition, a rib-like protrusion 1g that is long in the vertical direction is formed at a position directly below the center of the protrusion 1d. The rib-shaped protrusion 1g is formed at the center of a band-shaped elastically deformable portion 1i that is sectioned by two split grooves 1h, 1h extending in the left-right direction.

  In the first example of the electric pencil sharpener shown in FIGS. 1 to 7, the operation body is a rotation operation body 6. The rotating operation body 6 is attached to be rotatable about a position between the first insertion hole 1a and the second insertion hole 1b and is eccentric to the rotation center. In the first position (FIG. 1) where the introduction opening 6a of the pencil P is provided and the introduction opening 6a communicates with the first insertion hole 1a, the second insertion hole 1b is closed, and the introduction opening 6a is In the second position (FIG. 2) communicated with the two insertion holes 1b, the first insertion hole 1a is closed.

  In the illustrated example, the rotational operation body 6 has a short cylindrical shape with one end closed. The rotating operation body 6 has a shape for receiving the protruding portion 1d with a small clearance from the other end of the opened cylinder. In the illustrated example, in a state where the protruding portion 1d is received in the turning operation body 6 in this way, a boss portion 6b formed at the center of the turning operation body 6 enters the through hole 1e. The turning operation body 6 is turned around the boss 6b as a turning center. In the illustrated example, the screw 7 is fastened to the boss 6b from the inside of the casing 1 via a seat plate, thereby maintaining the combined state of the rotating operation body 6 and the casing 1.

  In the illustrated example, the introduction opening 6a is a circular hole that penetrates the front plate portion 6c that closes the other end of the cylinder of the rotating operation body 6. In the illustrated example, the introduction opening 6a is larger than the first insertion hole 1a and the second insertion hole 1b, and at the first position, the first insertion hole is located on the left side of the center of the introduction opening 6a. 1a is positioned, and in the second position, the second insertion hole 1b is positioned on the right side of the center of the introduction opening 6a.

  On the inner side of the rotating operation body 6 and on the outer peripheral side opposite to the introduction opening 6a side with the rotation center interposed therebetween, the step 1f corresponding to the first position and the second position respectively is below A detent portion 6d that abuts from is formed. Further, at positions inside the rotation operation body 6 and on both sides of the rotation center and spaced apart by 90 degrees in the rotation direction with respect to the rotation stopper 6d, In the first position and the second position, a recess 6e is formed in which the rib-shaped protrusion 1g is accommodated by the elastic deformation of the band-shaped elastically deformable portion 1i.

  Thereby, in this embodiment, the said rotation operation body 6 can be rotated within the range of 180 degree | times between said 1st position and said 2nd position, and said 1st position and The state in the second position is temporarily held by the protrusion 1g and the recess 6e.

  In the illustrated example, the first display portion 1k that can be visually recognized from the outside through the introduction opening 6a when the rotation operation body 6 is in the first position, and the rotation operation body 6 are located on the protrusion 1d. A second display portion 1m that is visible from the outside through the introduction opening 6a when in the second position is attached. By setting the second display portion 1m as a display that clearly or implies a relatively soft pencil P such as a colored pencil, the pencil P having a relatively soft core is sharpened when the second display portion 1m is visible. The user can understand what to do.

  In the illustrated example, a plurality of anti-slip recesses 6f for facilitating the rotation operation are formed on the side portion of the rotation operation body 6 with a gap between adjacent recesses 6f in the rotation direction. ing.

  The first cutting means 2 is supported in the casing 1 so that the center of rotation is substantially aligned in the front-rear direction, and is supported rotatably by the base 2a and a base 2a that receives one end of the pencil P. And a rotary blade 2d that rotates with the rotation of the base 2a and cuts one end of the pencil P received by the base 2a.

  The base 2a is supported on the casing 1 side so that a virtual straight line y1 (see FIG. 5) along the front-rear direction passing through the center of the first insertion hole 1a is the center of rotation. At the front end of the base 2a, an introduction port 2c into the receiving space 2b for the pencil P is formed, and this introduction port 2c is located behind the first insertion hole 1a. The inner back portion of the receiving space 2b is a conical space whose sectional area decreases toward the rear side of the casing 1. The rotary blade 2d has a part of its peripheral surface facing the conical space. The rotary blade 2d is rotatably supported by the base so that its rotation axis substantially follows the inclination of the inclined peripheral surface of the conical space. A gear portion 2e that meshes with an internal gear (not shown) formed on the casing 1 side is attached to the rear end portion of the rotary blade 2d. When the base 2a rotates, the rotary blade 2d rotates and receives space. It revolves around one end of the pencil P inserted into 2b, so that one end of the pencil P inserted into the receiving space 2b is cut. Although illustration is omitted, on the peripheral surface of the rotary blade 2d, a blade body having a rib shape along a spiral around the rotation axis is formed. In FIGS. 5 and 7, reference numeral 2f indicates a counterweight for the rotary blade 2d.

  The second cutting means 3 is supported in the casing 1 so as to substantially follow the center of rotation in the front-rear direction and receives a first end of a pencil P, and is fixed to the base 3a and fixed to the base 3a. A fixed blade 3d for cutting one end portion of the pencil P received by the base 3a as the base 3a rotates is provided.

  The base 3a is supported on the casing 1 side so that an imaginary straight line y2 (see FIG. 5) passing through the center of the second insertion hole 1b along the front-rear direction is the center of rotation. At the front end of the base 3a, an introduction port 3c into the receiving space 3b for the pencil P is formed, and this introduction port 3c is located behind the second insertion hole 1b. The receiving space 3b is a conical space whose cross-sectional area becomes smaller toward the rear side of the casing 1. The fixed blade 3d has its cutting edge facing the conical space, and when the base 3a rotates, the fixed blade 3d moves around the one end of the pencil P inserted into the receiving space 3b. As a result, one end of the pencil P is cut.

  In the illustrated example, the rear end of the base 2 a of the first cutting means 2 is fixed to the rotation center of the first gear 8, and the rear end of the base 3 a of the second cutting means 3 is set to the rotation center of the second gear 9. The first gear 8 and the second gear 9 are fixedly engaged with the interlocking gear 10 positioned immediately below them. When the motor 4 is driven by the transmission gear 11 that connects the drive shaft of the motor 4 and the first gear 8, the base 2 a of the first cutting means 2 is rotated and the second cutting means 3 is rotated by the interlocking gear 10. The base 3a is rotated in the opposite direction to the base 2a of the first cutting means 2.

  In the illustrated example, the slide member 12 is disposed between the first insertion hole 1a and the second insertion hole 1b, and the front end of the base 2a of the first cutting means 2 and the front end of the base 3a of the second cutting means 3. ing. When the pencil P is inserted into one of the first insertion hole 1a and the second insertion hole 1b, the slide member 12 contacts the one end of the pencil P and moves to the left from the reference position shown in FIG. The movable portion 15 of the switch indicated by reference numeral 14 in the figure is pushed by the left end. In the illustrated example, when the movable portion 15 of the switch 14 is pressed, a drive circuit (not shown) of the motor 4 is closed (ON), the motor 4 is driven, and the base 2a and the second 2 of the first cutting means 2 are driven. The base 3a of the cutting means 3 is rotated at the same time. In FIG. 5, reference numeral 13 denotes a spring interposed between the slide member 12 and the casing 1 so as to force the slide member 12 to return to the reference position when the pencil P is extracted. When the slide member 12 moves backward, the drive circuit of the motor 4 is opened (OFF).

 According to the electric pencil P sharpening according to this embodiment, the second cutting means 3 can appropriately sharpen the pencil P having a relatively soft core such as a colored pencil without using human power. The first cutting means 2 and the second cutting means 3 are simultaneously driven by a single built-in motor 4, but the pencil P to be cut by the rotating operation body 6 is the first cutting means 2 and the second cutting means 3. Only one of the two cutting means 3 is accepted, and the motor 4 and its driving force transmission mechanism are not subjected to an excessive burden when cutting the pencil P.

  8 and 9 show a second example of an electric pencil sharpener in which the operation body is a slide operation body 6 'that can be slid in the left-right direction. The slide operation body 6 ′ has, on the outside of the casing 1, a first position (see FIG. 8) in which the first insertion hole 1a is opened so that the pencil P can be inserted and the second insertion hole 1b is closed. The second insertion hole 1b is opened so that the pencil P can be inserted, and the second insertion hole 1a is slidable in the left-right direction across the second position (see FIG. 9). It has been.

  In this second example, the front portion 1c of the casing 1 is formed with a recess 1n in which the slide operating body 6 'can be slidably moved in the left-right direction. The length in the left-right direction of the recess 1n is about twice the length in the left-right direction of the slide operation body 6 ', and the vertical width of the recess 1n is equal to the vertical width of the slide operation body 6'. Are substantially equal. A first insertion hole 1a is formed on the left side of the center of the recess 1n at the middle in the left-right direction, and a second insertion is inserted on the right side of the center of the recess 1n in the left-right direction. A hole 1b is formed. At the first position where the slide operation body 6 'has been moved to the right, the first insertion hole 1a and the first display portion 1k appear between the left end of the slide operation body 6' and the left end of the recess 1n, and the second The insertion hole 1b and the second display portion 1m are hidden by the slide operation body 6 ′ (FIG. 8). At the second position where the slide operation body 6 ′ has been moved to the left, the second insertion hole 1b and the second display portion 1m appear between the right end of the slide operation body 6 ′ and the right end of the recess 1n. The insertion hole 1a and the first display portion 1k are hidden by the slide operation body 6 ′ (FIG. 9).

  The remaining structure of the example shown in FIGS. 8 and 9 is the same as or substantially the same as the example shown in FIGS.

  As a matter of course, the present invention is not limited to the embodiment described above, but includes all embodiments that can achieve the object of the present invention.

P Pencil 1 Casing 1a First insertion hole 1b Second insertion hole 2 First cutting means 2a Base 3 Second cutting means 3a Base 4 Motor 6 Rotating operation body 6a Introduction opening

Claims (2)

In the front part, a casing comprising a first insertion hole and a second insertion hole for a pencil;
A first position where the first insertion hole is opened and the second insertion hole is closed outside the casing, and a second position where the second insertion hole is opened and the first insertion hole is closed. An operation body provided to be movable between
A first cutting means in the casing for cutting the one end of the pencil inserted from the first insertion hole;
A second cutting means in the casing for cutting the one end of the pencil inserted from the second insertion hole;
The first cutting means is supported in the casing so as to substantially follow the center of rotation in the front-rear direction and receives a pencil end, and is rotatably supported by the base and the base. A rotating blade for cutting the one end of the pencil that is rotated with the rotation and received in the base,
The second cutting means is supported in the casing so as to substantially follow the center of rotation in the front-rear direction and receives a pencil end, and is fixed to the base and rotates with the base. A fixed blade that cuts one end of the pencil received in the base.
An electric pencil sharpener configured to simultaneously rotate the base of the first cutting means and the base of the second cutting means by driving a motor incorporated in the casing.   The operating body is attached to the outside of the casing so as to be rotatable about a position between the first insertion hole and the second insertion hole and is eccentric with respect to the rotation center. The second insertion hole is closed at the first position where the introduction opening communicates with the first insertion hole, and the introduction opening communicates with the second insertion hole. The electric pencil sharpener according to claim 1, wherein the electric pencil sharpener is configured as a rotating operation body configured to close the first insertion hole in a position.

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