JPWO2012081408A1 - Electric pencil sharpener - Google Patents

Abstract

Provided is an electric pencil sharpener that can sharpen a tip to a predetermined thickness and has high energy saving performance. In the electric pencil sharpener 1 that sharpens the pencil inserted into the cylindrical member 20 with the cutting blade 30, a detection unit that detects that the core of the pencil inserted into the cylindrical member has reached a predetermined position is provided. The contact member 40 with which the tip is brought into contact, the moving member 50 provided with the inclined surface 52 and moving in the direction orthogonal to the pencil insertion direction, and urged toward the moving member 50 to contact the inclined surface 52. A contact point member is pressed to configure the operation of the cutting blade. Was configured to stop.

Description

  The present invention relates to an electric pencil sharpener, and more particularly to an electric pencil sharpener that can be sharpened to a predetermined core thickness and has an energy saving effect.

The electric pencil sharpener is provided with a cutting part for sharpening a pencil, a driving part for driving the cutting part, and a waste container part for receiving cutting waste in a housing having a pencil insertion opening. Composed.
The cutting unit is configured by attaching a cylindrical member for inserting and holding a pencil and a spiral cutting blade for sharpening the pencil in a cylinder that rotates about the pencil insertion opening.
The cutting blade is disposed so as to be inclined with respect to the cylindrical member so that the tip of the pencil can be sharpened. A planetary gear is provided at the base of the cutting blade. By engaging with the internal gear provided on the inner periphery of the cylinder, the rotation of the cylinder causes the pencil to rotate while rotating itself in the opposite direction to the cylinder. It is designed to move around.

The inner circumference of the cylindrical member is reduced in diameter toward the tip in accordance with the sharpness of the pencil, and a slit is provided in the reduced diameter portion.
When a pencil is inserted into the cylindrical member and brought into contact with the reduced diameter portion, the cutting blade is attached so that the portion exposed through the slit comes into contact with the blade edge. When the cutting blade rotates around the pencil, the cutting blade itself is rotated by the planetary gear while moving around the cylindrical member to cut the pencil portion exposed from the slit.

The power source for rotating the cylinder to drive the cutting part is designed to be turned on by inserting a pencil and to be turned off by removing the pencil. In such an electric pencil sharpener, A technique has been proposed in which the power is automatically turned off when is removed (see Patent Document 1).
In addition, a technique for providing a function of adjusting the thickness of the core tip has been proposed (see Patent Document 2).

JP 2000-255195 A Japanese Patent Laid-Open No. 6-210995

In the electric pencil sharpener as described above, after inserting the pencil into the cylindrical member, it recognizes that the pencil has been sharpened based on the insertion time, cutting sound, etc., and then pulls out the pencil. I didn't understand, the pencil was pulled out before it was finished, or the motor continued to drive, even though it had already been cut.
For this reason, it may not be possible to cut to a desired core thickness, or the power consumption may increase.

  Accordingly, an object of the present invention is to provide an electric pencil sharpener that can be sharpened to a predetermined core thickness and has an energy saving effect.

  In order to solve the above-described problems, an electric pencil sharpener according to the present invention includes a cylindrical member that rotates and rotates around a pencil insertion port, a cylindrical member that holds the pencil, and a pencil that moves around the pencil. A cutting blade is attached to form a cutting portion, and a pencil is pressed against the reduced diameter portion provided at the tip of the cylindrical member, and is exposed through a slit provided in the reduced diameter portion. An electric pencil sharpener that sharpens a part with the cutting blade, and includes a detection unit that detects that a tip of a pencil inserted into the cylindrical member has reached a predetermined position, and the detection unit The present invention is characterized in that the operation of the drive unit for rotating the cylinder is stopped.

  In this case, the detection unit includes a contact member with which the tip of the pencil inserted into the cylindrical member abuts, and a moving member that includes an inclined surface and moves in a direction orthogonal to the pencil insertion direction. And a switch member connected to a switch for stopping the operation of the drive unit while being urged toward the moving member and in contact with the inclined surface. The operation of the drive unit may be stopped when the contact member is pressed.

  In the electric pencil sharpener according to the present invention, the driving unit for operating the cutting unit is provided with a detection unit for detecting that the core of the inserted pencil has reached a predetermined position. By cutting while pressing against the reduced diameter portion at the distal end of the cylindrical member, the detection portion can detect that the core tip that has appeared from the distal end of the reduced diameter portion has reached a predetermined position, and the operation of the cutting portion can be stopped. . This makes it possible to sharpen the pencil to a predetermined core thickness with the minimum necessary power.

It is a front view of the electric pencil sharpener which concerns on embodiment of this invention. It is a side view of the said electric pencil sharpener. It is the figure which looked at the said electric pencil sharpener from the upper surface. It is AA arrow sectional drawing of the said electric pencil sharpener. It is BB line principal part sectional drawing of the said electric pencil sharpener. It is a perspective view which shows the cutting part and core tip contact member of the said electric pencil sharpener. It is explanatory drawing which shows the nib adjustment mechanism of the said electric pencil sharpener, (a) is a state where the nib is made the thinnest, (b) is a state where the nib thickness is switched, and (c) is the nib. The thickest case is shown. It is a perspective view which shows the moving member of the said electric pencil sharpener, (a) shows the state seen from the cutting part side, (b) shows the state seen from the switch member side.

  A preferred embodiment of the present invention will be described with reference to the accompanying drawings. In addition, embodiment is not limited to the following forms, Other aspects can also be implemented if the subject of this invention can be solved.

1, 2, and 3 are a front view, a side view, and a plan view showing an electric pencil sharpener 1 according to an embodiment of the present invention.
This electric pencil sharpener 1 is capable of adjusting the degree of pencil sharpening, and as shown in FIGS. 4 and 5, a cutting unit for sharpening a pencil in a housing 3 having a pencil insertion opening 2. 4, a driving unit 5 for driving the cutting unit 4, and a waste container 6 for receiving cutting waste are provided. On the upper surface of the housing 3, a switching operation unit 7 for switching the thickness of the core is provided.

As shown in FIG. 6, the cutting unit 4 is configured by attaching a cylindrical member 20 for inserting and holding a pencil and a spiral cutting blade 30 for cutting a pencil into a cylinder 10. .
The cylinder 10 is rotated about the pencil insertion opening 2 by a motor provided in the drive unit 5. On the inner peripheral surface of the cylinder 10, there is provided an internal gear 11 for rotating the cutting blade 30 as it rotates by engaging with a planetary gear 31 provided on the cutting blade 30 (FIG. 4). See).

A cylindrical member 20 is disposed at the axial center of the cylinder 10.
The diameter of the cylindrical member 20 decreases toward the tip, and a slit 22 is provided in the reduced diameter portion 21 (see FIG. 6). The inner circumference of the reduced diameter portion 21 is inclined according to the sharpness of the pencil, and when the pencil is brought into contact with the reduced diameter portion 21, the pencil portion exposed through the slit 22 is removed. It is done. Then, the shaved tip emerges from the opening 23 at the tip.

The cutting blade 30 is configured by providing a plurality of spiral blades on the peripheral side surface of the columnar member, and one end thereof is fixed to a flange portion provided on the outer periphery of the cylindrical member 20, and the reduced diameter portion 21. It is arranged in an inclined shape in accordance with the reduced diameter state.
The other end of the cutting blade 30 is assembled to the cylinder 10 via a planetary gear 31 provided at the base, and the rotation of the cylinder 10 causes the rotation of the cylindrical member 20 while rotating itself. It is configured to move around the pencil.

  When a pencil is inserted into the cylindrical member 20 located at the center of the cylinder 10 and brought into contact with the reduced diameter portion 21, a portion exposed through the slit 22 comes into contact with the cutting edge of the cutting blade 30. A cutting blade 30 is arranged (see FIG. 5). By configuring in this way, the cylinder 10 rotates about the pencil insertion port 2, so that the cylindrical member 20 also rotates about the pencil insertion port 2 together with the cylinder 10, and with the rotation of the cylindrical member 20, The cutting blade 30 moves while rotating around it, and the pencil inserted into the cylindrical member 20 can be sharpened.

Next, the configuration of the drive unit 5 for driving the cutting unit 4 by rotating the cylinder 10 will be described.
The motor for rotating the cylinder 10 is controlled by two detection units.
The first detection unit is for detecting that a pencil is inserted into the cylindrical member 20, and is a sensor S1 provided in the vicinity of the pencil insertion slot 2 (see FIG. 4).
The sensor S1 is configured to detect that a pencil has been inserted, turn on the power of the drive circuit, and operate a motor for rotating the cylinder 10. Then, the power is turned off by pulling out the pencil.

The second detection unit is for detecting that the pencil inserted into the cylindrical member 20 has been cut to a predetermined core thickness, and the contact member 40 with which the pencil core contacts is brought into contact. And a second sensor S2 for stopping the operation of the motor by the pressing force of the pencil on the contact member 40.
The contact member 40 is disposed at a position away from the opening 23 at the tip of the reduced diameter portion 21 of the cylindrical member 20 by a predetermined distance, and the tip contact portion 41 at the tip is pressed by the pencil tip, It moves in the horizontal direction along the axial direction of the pencil and presses the contact of the second sensor S2. As a result, the motor drive circuit is opened, and the rotation of the cylinder 10 is stopped.

Such a contact member 40 is provided with a tip adjustment mechanism.
As shown in FIG. 7, the tip adjustment mechanism includes a tip contact member 42 having a tip contact portion 41 at the tip, a moving member 50 that moves in a direction orthogonal to the pencil insertion direction, and the moving member. 50 and the switch member 60 provided between the sensor S2.
The tip contact member 42 moves in the axial direction when the tip is pushed by the tip of the pencil, and presses the moving member 50 at the rear end.

As shown in FIG. 8, the moving member 50 has a gentle inclined surface 52 on the back side of the surface 51 extending in its moving direction (that is, a direction orthogonal to the pencil insertion direction). A tip contact member 42 is in contact with the front surface 51, and a switch member 60 is in contact with the inclined surface 52 on the back side.
The inclined surface 52 is brought into contact with a portion (a narrow portion S where the thickness width of the moving member 50 is small) where the switch member 60 comes into contact when the core is set thin, and when the core is set thick. It is the structure which provided the inclination part 53 between the site | parts (the wide part F where the thickness width of the moving member 50 is large) (refer FIG.7 (c)).

  The switch member 60 is biased toward the moving member 50 by a spring 61 disposed between the partition wall 3a and the switch member 60 in contact with the inclined surface 52 of the moving member 50. In contact. Thus, the tip contact member 42, the moving member 50, and the switch member 60 are arranged on the axis line in the connected state, and the moving member 50 is connected to the axis line via the switching operation portion 7 on the upper surface of the housing. By enabling movement in a direction perpendicular to the direction, a mechanism for opening the motor drive circuit and stopping the rotation of the cylinder 10 can be realized with a simple configuration.

The usage state of the electric pencil sharpener 1 having the above-described configuration will be described.
When the pencil is inserted into the pencil insertion slot 2 in the initial state shown in FIG. 7A (that is, the state set at the thinnest core tip), the drive motor for rotating the cylinder 10 is activated by the first sensor S1. To do. As the cylinder 10 rotates, the cylindrical member 20 rotates about the pencil as the central axis, and the cutting blade 30 scrapes off the portion of the pencil exposed at the movement position of the slit 22 accompanying the rotation.

By applying manual pressure to the pencil and continuing to insert it, the core tip shaved from the opening 23 at the tip of the cylindrical member 20 appears and contacts the tip contact portion 41 of the contact member 40. In response to the pressing force, the second sensor S2 opens the motor drive circuit and stops the rotation of the motor.
As described above, the contact member 40 detects that the tip of the pencil inserted into the cylindrical member 20 has reached a predetermined position, and the operation of the motor is stopped by the electrical signal from the detection unit. As a result, it is possible to prevent overcutting of the lead tip and to prevent waste of power.

When switching the shaving condition of the tip from thin to thick, operating the switching member 7 provided on the upper surface of the electric pencil sharpener 1 in the direction of the wide part F to move the moving member 50 It is moved in the direction X orthogonal to the axis.
Then, the moving member 50 moves itself in the direction Y close to the cylindrical member 20 while bringing the switch member 60 into contact with the inclined surface 52.

Along with the movement of the moving member 50, the tip contact member 42 also moves in the direction Z close to the tubular member 20, and the tip contact tip 41 at the tip is a predetermined one set for a thick lead. Set to the tip position.
In the present embodiment, the second detection unit opens the driving circuit in a state where the moving member 50 having the inclined surface 52 and the moving member 50 are urged toward the moving member 50 and are in contact with the inclined surface 52. Since the switch member 60 is connected to the switch for closing, the contact member 40 can be moved in the pencil insertion direction by moving the moving member 50 in the direction orthogonal to the pencil insertion direction. It becomes possible, and it becomes possible to realize a mechanism for stopping the operation of the cutting section 4 when it is cut to a predetermined core thickness with a simple configuration.

In the present embodiment, the second detection unit only needs to be designed to detect that the tip of the pencil inserted into the cylindrical member 20 has reached a predetermined position. In addition to mechanical methods, known methods such as electrical methods and optical methods can be used. In this case, various types of sensors such as an optical sensor having a light receiving element can be used.
In the present embodiment, the electric pencil sharpener has a tip adjustment function. However, the electric pencil sharpener in the present invention may not have a tip adjustment function. In this case, the lead exposed from the opening 23 of the tubular member 20 can be configured to directly press the second sensor S2.

  The present invention can be applied in all industrial fields as an electric pencil sharpener for cutting all pencil-shaped members such as pencil-shaped cosmetics.

DESCRIPTION OF SYMBOLS 1 ... Electric pencil sharpener 2 ... Pencil insertion slot 3 ... Housing 4 ... Cutting part 5 ... Drive part 6 ... Waste storage part 7 ... Switching operation part 10 ... Cylinder 11 ... internal gear 20 ... cylindrical member 21 ... reduced diameter portion 22 ... slit 23 ... opening 30 ... cutting blade 31 ... planetary gear 40 ... contact member 41 ... nib contact part 42 ... nib contact member 50 ... moving member 51 ... surface 52 ... inclined surface 53 ... inclined part 60 ... switch member 61 ... ·Spring

Claims (5)

A cylindrical member (20) for inserting and holding a pencil into a cylinder (10) that rotates about the pencil insertion opening (2) as a center, and a cutting blade (30) that moves around the pencil and sharpens the pencil, To form a cutting part (4), and by pressing a pencil against the reduced diameter part (21) provided at the tip of the cylindrical member (20), a slit provided in the reduced diameter part (21) An electric pencil sharpener (1) that sharpens a portion exposed through (22) with the cutting blade (30),
A detection unit for detecting that the tip of the pencil inserted into the cylindrical member (20) has reached a predetermined position is provided, and a drive unit (5) for rotating the cylinder (10) by the detection unit. The electric pencil sharpener is configured to stop the operation of   The detection unit is a contact member (40) with which a lead of a pencil inserted into the cylindrical member (20) is brought into contact, and the driving unit (5) is pressed by a pressing force against the contact member (40). 2. The electric pencil sharpener according to claim 1, wherein a drive circuit for operating the motor is opened.   The contact member (40) is disposed at a position away from the opening (23) provided at the tip of the reduced diameter portion (21) by a predetermined distance, and the tip contact portion (41) at the tip is a pencil. The electric pencil sharpener according to claim 2, wherein the electric pencil sharpener moves along the axial direction of the pencil and is pressed against the contact member (40) by being pushed by the tip of the lead. The detection unit includes an inclined surface (52) and moves in a direction orthogonal to the pencil insertion direction, and is urged toward the moving member (50) and the inclined surface (52). And a switch member (60) connected to a closing switch for opening the drive circuit in a state of being in contact with
With the movement of the moving member (50), the contact member (40) is moved in the pencil insertion direction in a state where the connection with the closed switch is maintained, and the portion (41) with which the tip is brought into contact is displaced. The electric pencil sharpener according to claim 2 or 3, wherein the electric pencil sharpener is configured as described above. An electric pencil sharpener (1) that sharpens a pencil inserted into a cylindrical member (20) with a cutting blade (30), wherein the core of the pencil inserted into the cylindrical member (20) is at a predetermined position. The detection unit that detects that
A contact member (40) with which the lead of a pencil inserted into the cylindrical member (20) contacts,
A moving member (50) that includes an inclined surface (52) and moves in a direction perpendicular to the pencil insertion direction, and is biased toward the moving member (50) and brought into contact with the inclined surface (52). And a tip adjustment mechanism comprising a switch member (60) connected to a drive unit for driving the cutting blade (30) in a state,
An electric pencil sharpener configured to stop the operation of the cutting blade (30) when the contact member (40) is pressed.

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