CN111836728B

CN111836728B - Pencil sharpener

Info

Publication number: CN111836728B
Application number: CN201980001663.6A
Authority: CN
Inventors: 橡尾洋介
Original assignee: Keciwang Corp
Current assignee: Keciwang Corp
Priority date: 2019-04-26
Filing date: 2019-05-22
Publication date: 2022-02-25
Anticipated expiration: 2039-05-22
Also published as: JP6971483B2; TW202039270A; KR20200125893A; TWI720733B; CN111836728A; WO2020217544A1; JP2020183042A; DE112019000062T5; KR102240843B1

Abstract

The invention provides a pencil sharpener, which can simply and reliably set the sharpening angle of a pencil to an optimal angle suitable for the hardness of a pencil lead. The pencil sharpener has a holding portion that allows a pencil to be inserted along an insertion axis, and a rotary blade portion that is provided at an inclination angle set with respect to the pencil insertion axis while driving a leading end portion of the pencil by rotation of a handle. A pencil sharpener that cuts a tip end portion of a pencil at a set cutting angle, the pencil sharpener including a blade holding member that holds the rotary blade portion in a tiltable manner in the holding portion at a certain tilt angle around a tilt axis set in the holding portion; an elastic member that applies a biasing force in the direction in which the inclination angle increases to the rotary blade portion; a blade angle holding member for holding an inclination angle of the rotary blade at a predetermined angle; an angle determining means capable of determining the inclination angle of the rotary blade portion based on the cutting angle corresponding to the hardness of the pencil lead.

Description

Pencil sharpener

Technical Field

The invention relates to a pencil sharpener used on a desk, which can select the sharpening angle of a pencil.

Background

The pencil sharpener used on a desk generally has a function of selecting the sharpness of the lead of the pencil. The pencil sharpener is in contact with the tip of a pencil lead, and a pencil lead position determining member is provided inside the rotary blade portion of the pencil sharpener so as to be capable of changing the position thereof, thereby determining the insertion position of the pencil with respect to the rotary blade portion and determining the sharpness of the pencil lead.

However, when sharpening a pencil, it is desirable to select the cutting angle of the pencil shaft in addition to the sharpness of the lead of the pencil.

That is, the pencil lead used by the children of the lower grade of primary school is very soft (e.g., 2B-4B), and they write with great strength. Therefore, in order to prevent breakage of the pencil lead, a pencil having a cutting angle (for example, 26 degrees) larger than the cutting angle (for example, 20 degrees) of a pencil (for example, having hardness of H, HB, B, or the like) generally used is desired.

Further, since the colored pencil has a softer lead strength than the ordinary pencil, it is desirable that the colored pencil has a larger cutting angle (e.g., 35 degrees).

Therefore, as a pencil sharpener used on a desk, there is a demand for a pencil sharpener capable of setting a sharpening angle to an optimum angle depending on the application and the type of pencil, as compared with the conventional pencil sharpener.

Patent document 1 discloses a pencil sharpener capable of changing the angle of pencil sharpening, in which one end of a sharpening roller shaft is supported by a wedge capable of freely moving in and out, and the inclination of the sharpening roller can be changed.

Documents of the prior art

Patent document 1: utility model publication No. 38-23952

Disclosure of Invention

Problems to be solved by the invention

The pencil sharpener described in patent document 1 can change the cutting angle of the pencil shaft, but the set cutting angle is difficult to understand, and it is difficult to set an optimum cutting angle according to the kind of pencil or the hardness.

To solve the above problems, the present invention provides a pencil sharpener capable of easily and reliably designating the cutting angle of a pencil shaft as an optimum angle according to the hardness of a pencil lead.

Means for solving the problems

In order to solve the above problems, the invention provides, in claim 1, a pencil sharpener having a holding portion that allows a pencil to be inserted along a shaft insertion axis and a rotary blade portion that is provided at a set inclination angle with respect to the shaft insertion axis and that is driven to rotate a leading end portion of the pencil by a rotary handle, the pencil sharpener being configured to sharpen the leading end portion of the pencil at a set cutting angle. The pencil sharpener includes a blade holding member for holding the rotary blade portion on the holding portion so as to be tiltable at a predetermined tilt angle about a tilt axis provided on the holding portion; an elastic member that applies a biasing force in the direction in which the inclination angle increases to the rotary blade portion; a blade angle holding member that holds the inclination angle of the rotary blade portion at a certain angle; an angle determining means capable of determining the inclination angle of the rotary blade portion based on the cutting angle suitable for the hardness of the pencil lead.

Here, the "lead hardness" of the pencil includes hardness (H, HB, B, etc.) specified in JIS standard and lead hardness of a color pencil softer than a normal pencil.

According to the present invention, the rotary cutter portion is held so as to be tiltable about the tilting axis during pencil sharpening, and the elastic member applies a biasing force in a direction in which the tilting angle increases. The blade holding member is in contact with the blade angle holding member to hold the angle of inclination of the rotary blade at a predetermined angle. The angle determining means determines the inclination angle of the rotary cutter portion based on the cutting angle suitable for the hardness of the pencil lead.

Therefore, the angle of the rotary blade with respect to the shaft for inserting the barrel can be selected and set only by operating the blade angle holding member, and the optimum angle for cutting the pencil can be determined simply and accurately according to the kind or use of the pencil.

The invention described in claim 2, the pencil sharpener according to claim 1, characterized in that the blade portion angle retention means has an angle retention inner surface which is a rotation surface of the blade retention means, the rotation surface having a different radius along the barrel insertion axis with the insertion axis as an axis; the blade holding member has a rotating member that rotates in contact with the angle holding inner surface of the blade angle holding member; the angle determining member rotates around the shaft for inserting the shaft, so that the blade angle maintaining member moves forward and backward in the direction of the shaft for inserting the shaft.

According to the present invention, the angle of the blade holding member is determined by the radius of the angle retaining inner surface, and the rotating member of the blade holding member rotates in contact with the inner surface. Since the angle maintaining inner surface has the rotation surfaces having different radii with the insertion shaft as an axis, the revolution radius of the rotational member of the blade holding member, that is, the inclination angle of the blade holding member can be set by moving the blade angle maintaining member forward and backward along the barrel insertion shaft by the angle determining member. Therefore, by rotating the operation angle determining member, the optimum angle can be simply and reliably specified to sharpen the pencil according to the type or use of the pencil.

Also, the invention of claim 3, the pencil sharpener according to claim 2, characterized in that the blade portion angle retaining member is formed in a cylindrical shape, the angle retaining inner surfaces have different radii, the inner surface is composed of a plurality of short cylindrical inner surfaces arranged at a certain interval in the shaft insertion direction, and a conical inner surface arranged between the short cylindrical inner surfaces so as to be continuous with the short cylindrical inner surfaces, the conical inner surfaces having different radii.

According to the present invention, since the angle maintaining inner surface has a plurality of short cylindrical inner surfaces and a conical inner surface connected to the short cylindrical inner surfaces, the inclination angle of the blade holding member can be set by moving the blade angle maintaining member back and forth along the shaft for inserting the cartridge by the angle determining member, rotating the rotating member to select the short cylindrical inner surface, and setting the revolution radius of the rotating member of the blade holding member. Further, when the rotating member moves back and forth from the inner surface of one short cylinder to the inner surface of the other short cylinder, the conical inner surfaces formed by connecting the inner surfaces of the short cylinders also move simultaneously. Therefore, the movement in the front-rear direction is easier when the tilt angle is changed.

Therefore, the inclination angle suitable for the hardness of the pencil can be specified in steps by rotating the operation angle specifying member, and further, the rotating movement of the rotating member can be smoothly performed by operating the operation angle specifying member when the steps are selected.

The invention described in claim 4, the pencil sharpener according to claim 2, characterized in that the angle-retaining inner surface of the blade-portion angle-retaining member has a conical inner surface whose radius changes linearly along the barrel insertion axis.

According to the present invention, the angle maintaining inner surface has a conical inner surface whose radius linearly varies along the barrel insertion axis so that the blade angle maintaining member is linearly moved along the insertion axis by the angle determining member, and the position of the conical inner surface is selected by rotating the rotating member, i.e., a different radius is selected, thereby enabling setting of the revolution radius of the rotating member of the blade holding member, i.e., the inclination angle of the blade holding member.

Therefore, by rotating the operation angle determining member, the inclination angle suitable for the pencil hardness can be easily and continuously specified.

The invention described in claim 5 is the pencil sharpener according to any one of claims 2 to 4, characterized in that the blade angle holding member has a projection on an outer peripheral surface thereof, and the angle determining member is formed into a cylinder having a larger diameter than the blade angle holding member so as to be rotatably driven from outside the pencil sharpener, covers an outer side of the blade angle holding member, and has a cam groove for allowing the blade angle holding member to move forward and backward when the angle determining member is rotated by inserting the projection of the blade angle holding member.

According to the present invention, the angle determining member is formed in a cylindrical shape having a diameter larger than that of the blade angle holding member, is rotatably driven from the outside of the pencil sharpener, covers the outside of the blade angle holding member, and is provided with a cam groove for moving the blade angle holding member forward and backward when the protrusion of the blade angle holding member is inserted and the angle determining member is rotated. Therefore, the protruding portion inserted into the cam groove is moved in the front-rear direction by the rotation angle determining member, and the blade angle holding member is moved in the front-rear direction in accordance therewith.

Then, the angle of the blade holding member is changed as the blade angle holding member is moved. Therefore, the cutting angle of the pencil can be changed by such a simple operation of the rotation angle determining member.

The invention described in claim 6 is the pencil sharpener according to claim 1, wherein the angle determination means has a rotary dial provided on a side of the pencil sharpener into which the pencil is inserted, and wherein the shape of the cutting corner of the selected pencil is displayed on the rotary dial as an icon of the pencil image.

According to the present invention, the angle determining member for determining the cutting angle of the pencil has a rotary dial provided on the pencil sharpener on the side where the pencil is inserted. The rotary dial displays the cutting corner shape of the selected pencil as an icon. Therefore, by confirming the displayed icon, the rotary dial is operated, and the angle determining member is rotated to operate the knife angle holding member. Thereby, the angle of the blade holding member is determined.

Therefore, the cutting angle of the pencil can be changed by a simple and easy operation of rotating the rotary dial by confirming the display icon of the cutting angle.

The invention described in claim 7 is the pencil sharpener according to claim 5, characterized in that a knob member is provided on the pencil sharpener, and the knob member is provided on the pencil sharpener so as to protrude therefrom, and is used for rotationally driving the angle determining member.

According to the invention, the angle-determining means has a knob means for rotationally driving the angle-determining means. Therefore, by rotating the knob rotation angle determining member, the protrusion inserted into the cam groove is moved in the front-rear direction, and the blade angle holding member is also moved in the front-rear direction in accordance therewith. Further, the angle of the blade holding member changes with the movement of the blade angle holding member. Therefore, the cutting angle of the pencil can be changed by such a simple and easy operation as to rotate the knob.

The invention described in claim 8 is the pencil sharpener according to claim 5, wherein the angle determining member includes a fulcrum provided at one end side of the pencil sharpener body and an operating lever member that moves along the insertion axis between an acting point and the fulcrum with the other end of the pencil sharpener body as the acting point and linearly operates the blade angle holding member.

According to the present invention, the angle determining member includes an operating lever member which linearly moves the blade angle holding member along the insertion axis between a fulcrum provided at one end side of the pencil sharpener body and an operating point provided at the other end side of the pencil sharpener body. Therefore, by operating the operating lever member, the protrusion inserted into the cam groove is moved in the front-rear direction, and the blade angle holding member is also moved in the front-rear direction in accordance therewith. And the angle of the blade holding member determined by the blade angle holding member is changed as the blade angle holding member moves. Therefore, the cutting angle of the pencil can be changed by a simple and easy operation of rotating the lever member.

The invention described in claim 9 is the pencil sharpener according to claim 1, wherein the blade angle holding member includes a plate cam that contacts a side of the blade holding member opposite to the insertion side of the pencil, the plate cam being capable of changing the inclination angles of the blade angle holding member and the insertion axis of the rotary blade; the angle determining member is a dial provided at a handle shaft portion of the pencil sharpener, and the dial can rotationally drive the plate cam.

According to the present invention, the blade-portion-angle holding member has a plate cam which is brought into contact with the opposite side of the insertion side of the pencil of the blade holding member to change the inclination angle, the plate cam being rotationally driven by a dial provided on a handle shaft portion of the pencil sharpener.

When the dial is operated to rotate the plate cam, the contact position between the plate cam and the blade holding member is changed to set the angle of the blade holding member. Therefore, the cutting angle of the pencil can be changed by such a simple and easy operation as to rotate the dial.

The invention described in claim 10 is the pencil sharpener according to claim 1, characterized in that the pencil sharpener drives the pencil to rotate by the handle, and the rotary blade portion rotates to rotate the pencil with respect to the rotary blade portion to sharpen the pencil. The pencil sharpener is provided with the blade angle holding member and the angle determining member as a position changing device for fixing the position of the blade angle holding member at a desired position.

According to the present invention, the rotary cutter portion is driven by the handle to rotate, and the pencil is driven by the handle to rotate. The knife angle holding member and the angle determining member are provided as a position changing device for fixing the position of the knife angle holding member at a desired position.

According to the invention described in claim 10, since the rotary cutter portion does not revolve, it is not necessary to maintain and determine the angle of the rotary cutter portion over the entire circumference. The structure of the blade angle holding member and the angle determining member can be simplified as the position changing device.

Effects of the invention

According to the pencil sharpener of the present invention, the cutting angle of the pencil cutting portion can be easily and reliably determined according to the type of the pencil or the hardness of the lead.

According to the pencil sharpener of claim 1, the rotary blade portion is held so as to be tiltable about the tilting axis during pencil sharpening, and the elastic member applies a biasing force in a direction in which the tilting angle increases. The blade holding member contacts the blade angle holding member to hold the angle of inclination of the rotary blade at a fixed angle. Then, the angle determining means determines the inclination angle of the rotary cutter portion based on the cutting angle suitable for the hardness of the pencil lead.

A pencil sharpener according to claim 2 where the angle of the blade holding means is determined by the radius of the angle retaining inner surface and the rotating means of the blade holding means rotates in contact with the inner surface. Since the angle retaining inner surface has the rotation surfaces having different radii with the insertion axis as the axis, the revolution radius of the rotating member of the blade retaining member, that is, the inclination angle of the blade retaining member can be set by moving the blade angle retaining member forward and backward along the shaft insertion axis by the angle determining member.

Therefore, by rotating the operation angle determining member, the pencil can be cut by simply and reliably determining the most suitable angle of hardness of the lead of the pencil according to the type or use of the pencil.

According to the pencil sharpener of claim 3, since the inner surface of the angle retaining member has a plurality of short cylindrical inner surfaces and a conical inner surface connected to the short cylindrical inner surfaces, the blade angle retaining member can be moved back and forth along the shaft insertion axis by the angle determining member, and the rotation of the rotating member selecting the short cylindrical inner surface can set the revolution radius of the rotating member of the blade retaining member, that is, the inclination angle of the blade retaining member. Further, when the rotating member moves back and forth from the inner surface of one short cylinder to the inner surface of the other short cylinder, the conical inner surfaces formed by connecting the inner surfaces of the short cylinders also move simultaneously.

Therefore, when the inclination angle is changed, the movement in the front-rear direction becomes easier. Therefore, by rotating the operation angle determining member, it is easy to specify the inclination angle in steps according to the pencil hardness, and further, by operating the operation angle determining member at the time of step selection, the rotation of the rotating member can be smoothly performed.

The pencil sharpener according to claim 4, wherein the angle-retaining inner surface has a conical inner surface whose radius changes linearly along the barrel insertion axis, so that the blade angle retaining member moves linearly along the barrel insertion axis through the angle determining member, and the position, i.e., the radius, of the conical inner surface is selected by rotating the rotating member, whereby the revolution radius of the blade retaining member rotating member, i.e., the inclination angle of the blade retaining member, can be set.

Therefore, by rotating the operation angle determining member, the inclination angle suitable for the hardness of the pencil lead can be easily and continuously set.

The pencil sharpener according to claim 5, wherein the angle determining member is a cylindrical shape having a diameter larger than that of the blade angle holding member, is rotatably driven from the outside of the pencil sharpener, and covers the outside of the blade angle holding member, and is provided with a cam groove for moving the blade angle holding member forward and backward when the protrusion of the blade angle holding member is inserted and the angle determining member is rotated. Therefore, the protrusion inserted into the cam groove is moved in the front-rear direction by the rotation angle determining member, and the blade angle holding member is moved in the front-rear direction in accordance therewith.

Then, the angle of the blade holding member determined by the blade angle holding member is changed as the blade angle holding member is moved. Therefore, the cutting angle of the pencil can be changed by such a simple operation of the rotation angle determining member.

The pencil sharpener according to claim 6, wherein the angle determining means is for determining the cutting angle of the pencil, and has a rotary dial provided on a side of the pencil sharpener where the pencil is inserted. On the rotary dial, the cutting corner shape of the selected pencil is displayed as an icon of a pencil image. Therefore, by confirming the displayed icon, the rotary dial is operated, and the angle determining member is rotated to operate the knife angle holding member. Thereby, the angle of the blade holding member is determined.

Therefore, the cutting angle of the pencil can be changed by a simple and easy operation of confirming the icon showing the cutting angle and rotating the rotary dial.

A pencil sharpener as claimed in claim 7 in which the angle determining means has a knob means for rotationally driving the angle determining means. Therefore, the angle determining member is rotated by the knob, the protrusion inserted into the cam groove is moved in the front-rear direction, and the blade angle holding member is also moved in the front-rear direction in accordance with the movement. Further, the angle of the blade holding member changes as the blade angle holding member moves. Therefore, the cutting angle of the pencil can be changed by such a simple and easy operation as to rotate the knob.

The pencil sharpener according to claim 8, wherein the angle determining member further comprises an operating lever member which linearly moves the blade angle holding member along the insertion axis between a fulcrum and an operating point, the fulcrum being one end of the operating lever member provided at the pencil sharpener body and the other end of the operating lever member being the operating point. Therefore, by operating the operating lever member, the protrusion inserted into the cam groove moves in the front-rear direction, and the blade angle holding member also moves in the front-rear direction in accordance therewith. And the angle of the blade holding member is changed with the movement of the blade angle holding member. Therefore, the cutting angle of the pencil can be changed by a simple and easy operation of rotating the lever member.

A pencil sharpener according to claim 9, a blade angle holding member having a plate cam which comes into contact with an opposite side of an insertion side of the pencil of the blade holding member to change an inclination angle, the plate cam being rotationally driven by a dial provided on a handle shaft portion of the pencil sharpener.

According to the pencil sharpener of claim 10, since the rotary blade part does not revolve, it is not necessary to maintain and determine the angle of the rotary blade part over the entire circumference. The structure of the blade angle holding member and the angle determining member can be simplified as the position changing device.

Drawings

Fig. 1 shows the appearance of a pencil sharpener according to a first embodiment of the present invention, (a) is a front view, (b) is a side view, (c) is a rear view, and (d) is a plan view.

Fig. 2 shows the internal structure of the cutting portion of the same pencil sharpener, (a) is an internal structure diagram with a cutting angle of 20 degrees, (b) is an internal structure diagram with a cutting angle of 26 degrees, (c) is an internal structure diagram with a cutting angle of 35 degrees, and (i) is a front view of the dial, and (ii) is a vertical sectional view of fig. 1(a) showing the internal state.

Fig. 3 is a sectional view showing the internal structure of the same pencil sharpener.

Fig. 4 shows the setting state of the cutting angle of the same pencil sharpener, (a) is an internal perspective view of the pencil sharpener when the cutting angle is 20 degrees, (b) is an internal perspective view of the pencil sharpener when the cutting angle is 26 degrees, and (c) is an internal perspective view of the pencil sharpener when the cutting angle is 35 degrees.

Fig. 5 shows the setting state of the cutting angle of the same pencil sharpener, (a) is a sectional view of the internal state when the cutting angle is 35 degrees, (b) is a sectional view of the internal state when the cutting angle is 26 degrees, and (c) is a sectional view of the internal state when the cutting angle is 20 degrees.

Fig. 6 shows a pencil sharpener of other embodiments of the present invention, (a) is a partial front view of the pencil sharpener of the second embodiment, (b) is a longitudinal section view of the pencil sharpener of the second embodiment, and (c) is a longitudinal section view of the pencil sharpener of the third embodiment.

Fig. 7 shows the external appearance of a pencil sharpener according to another embodiment of the present invention, wherein (a) is a longitudinal sectional view of the pencil sharpener according to the fourth embodiment, and (b) is a longitudinal sectional view of the pencil sharpener according to the fifth embodiment.

Fig. 8 shows the appearance of a pencil sharpener according to another embodiment of the present invention, (a) is a longitudinal sectional view of the pencil sharpener according to the sixth embodiment, (b) is a longitudinal sectional view of the pencil sharpener according to the seventh embodiment, (c) is a front view showing an example of a cam, and (d) is a front view showing another example of the cam.

Fig. 9 shows a pencil sharpener according to an eighth embodiment of the present invention, where (a) is a longitudinal sectional view of the pencil sharpener and (b) is a perspective view of the device part of the same pencil sharpener.

Fig. 10 shows a schematic diagram of a pencil-sharpening state.

Detailed Description

Next, the pencil sharpener of the present invention will be described in accordance with a specific embodiment of the present invention.

First embodiment

A pencil sharpener according to a first embodiment of the present invention will be described below. Fig. 1 shows the appearance of a pencil sharpener according to a first embodiment of the present invention, (a) is a front view, (b) is a side view, (c) is a rear view, and (d) is a plan view.

First, the appearance of the pencil sharpener (10) will be described. As shown in FIG. 1, the pencil sharpener 10 is composed of a main body 11, a rotary dial 12 for determining a cutting angle on the main body 11, a pencil insertion hole 13, a handle 14, and a pencil waste box 15. The main body (11) is composed of a front member (11A) and a rear member (11B).

A pair of display windows (16, 17) for identifying a pencil mark indicating the degree of cutting and the hardness of a lead on a main body (11) located on the rear surface are provided in the rotary dial (12), and a direction indicating section (18) for displaying the rotational position of the rotary dial (12) is provided in the rotary dial (12). The shapes of the rotary dial (12), the display windows (16, 17), and the direction indicator (18) are not limited to those described in the present embodiment, and other shapes and designs may be used.

As shown in FIG. 10, in the pencil sharpener (10) of the present embodiment, pencils are classified into three types, a pencil with a lead hardness of HB-2B, a pencil with a cutting angle of 20 degrees, a pencil with a lead hardness of 2B-4B, a pencil with a cutting angle of 26 degrees, a pencil with a lead hardness of 6B, or a colored pencil, and a pencil with a cutting angle of 35 degrees.

Therefore, as shown in fig. 2 and 3, in order to enable selection of the cutting angle of the pencil, the pencil sharpener 10 of the present embodiment has a cutting means 20 of the pencil P and a conveying means 70, the conveying means 70 holding the pencil P inserted into the insertion hole 13 in the rotation direction and conveying it in the cutting direction. In the pencil sharpener (10) according to the present embodiment, the constitution of the conveying means (70) is well known, and has the same constitution as a general pencil sharpener.

Fig. 2 shows a cut internal structure of the same pencil sharpener, (a) is an internal structure view with a cutting angle of 20 degrees, (b) is an internal structure view with a cutting angle of 26 degrees, (c) is an internal structure view with a cutting angle of 35 degrees, and (i) is a front view showing a dial, and (ii) is a longitudinal sectional view of fig. 1(a) showing an internal state. Fig. 3 is a sectional view of the internal structure of the same pencil sharpener. Fig. 4 shows the setting state of the cutting angle of the same pencil sharpener, (a) is an internal perspective view of the pencil sharpener when the cutting angle is 20 degrees, (b) is an internal perspective view of the pencil sharpener when the cutting angle is 26 degrees, and (c) is an internal perspective view of the pencil sharpener when the cutting angle is 35 degrees. Fig. 5 shows the setting state of the cutting angle of the same pencil sharpener, (a) is a sectional view of the internal state when the cutting angle is 35 degrees, (b) is a sectional view of the internal state when the cutting angle is 26 degrees, and (c) is a sectional view of the internal state when the cutting angle is 20 degrees.

As shown in fig. 3 and 5, the cutting device 20 includes a rotary cutter portion 21, a blade holding member 22, a holding portion 23, an elastic member 24, a first cylindrical member 40 having a function as an angle determining member, and a second cylindrical member 50 having a function as a cutter angle holding member.

In this embodiment, the first cylindrical member (40) is rotationally driven by an external rotary dial (12), and has a cam groove (43) in a side wall portion (42). The second cylindrical member (50) is provided in the first cylindrical member (40) and has a projection (58) that fits into the cam groove (43). When the first cylindrical member (40) is rotationally driven, the second cylindrical member (50) moves back and forth along the insertion axis OP to change the angle of the blade holding member (22) with respect to the insertion axis OP, the blade holding member (22) being in contact with the angle-retaining inner surface (50A).

The rotary cutter portion (21) is rotationally driven by a handle gear (60), the rotary cutter portion (21) rotates relative to the front end portion of the pencil P, and the handle gear (60) is driven by a rotary handle (14). The rotary cutter (21) has known helical teeth, and the rotary cutter (21) rotationally cuts the pencil while revolving around the pencil (P).

The blade holding member (22) rotatably holds the rotary blade part (21). The blade holding member (22) is moved up and down about a tilting axis O set in the blade holding member (22) to change an angle formed by the blade holding member (22), that is, the rotary blade section (21), and the insertion axis OP.

Further, the blade holding member (22) revolves around the pencil (P) by the drive of the rotary handle (14), and the pencil (P) is held by the holding portion (23). Such a device is well known. The blade holding member (22) has a pivot holding portion (22A), the pivot holding portion (22A) holds the shaft (26) of the rotating member (25), and the rotating member (25) is formed of a roller member. In this embodiment, the revolving radius of the rotating member (25) is determined by the contact position with an angle-retaining inner surface (50A) of a second cylindrical member (50) described later, thereby setting the inclination angle of the rotary blade portion (21) with respect to the insertion axis OP.

The elastic member (24) applies a rotational pressure (clockwise force in the figure) as a biasing force in a direction in which the angle of inclination of the blade holding member (22) with the insertion axis OP increases. The blade holding member (22) holds the rotary blade part (21). In this embodiment, the elastic member (24) is a screw spring.

Next, the first cylindrical member (40) will be described. As shown in fig. 2 and 3, the first cylindrical member (40) has a larger diameter than the second cylindrical member (50). The first cylindrical member (40) includes a bottom portion (41) and a side wall portion (42). The first cylindrical member (40) is connected to the rotary dial (12) at the bottom (41) via a connecting member (31), and therefore when the rotary dial (12) is rotated, the first cylindrical member (40) is also rotationally driven. The rotary dial (12) constitutes an angle determining member.

Two cam grooves, a cam groove (43) and another cam groove (43), are formed at a side wall portion (42) of the first cylindrical member (40). The cam groove (43) and the other cam groove (43) are engaged with a projection (58) to linearly move (move back and forth) the second cylindrical member (50) along the insertion axis OP, and the projection (58) is formed on the outer peripheral surface of the second cylindrical member (50) described later. The cam groove (43) and the other cam groove (43) are inclined with respect to the generatrix of the first cylindrical member (40) and formed at symmetrical positions about the insertion axis OP. By rotating the first cylindrical member (40), the projection (58) of the second cylindrical member (50) engaged therewith is driven in the front-rear direction, and the second cylindrical member (50) is moved in the front-rear direction.

Next, the second cylindrical member (50) will be described. As shown in fig. 2 and 4, in the second cylindrical member (50), the angle retaining inner surface (50A) is in contact with the turning member (25) of the blade holding member (22) and maintains the inclination angle of the rotary blade portion (21) at a predetermined angle.

The second cylindrical member (50) is provided so as to be movable only forward and backward, and a projection (58) and another projection (58) are formed on the outer peripheral surface, and the projection (58) and the other projection (58) are fitted in the cam groove (43) and the other cam groove (43) of the first cylindrical member (40), respectively. By rotating the first cylindrical member (40), the second cylindrical member (50) is moved in the front-rear direction along the insertion axis OP.

A second cylindrical member (50) is disposed along the insertion axis OP. The second cylindrical member (50) has an angle-maintaining inner surface (50A), and the angle-maintaining inner surface (50A) is formed as a surface of rotation having different radii along the insertion axis OP with the insertion axis OP as an axis. The two projections, the projection (58) and the other projection (58), are formed so as to project from the outside of the second cylindrical member (50).

The second cylindrical member (50) is further provided with two guide projections (56), and the two guide projections (56) are fitted into the two sets of guide rails (19, 19) to prohibit the second cylindrical member (50) from rotating and only allow the second cylindrical member (50) to linearly move along the insertion axis OP. The guide rail (19) is formed opposite to the inside of the body (11).

In the present embodiment, as shown in fig. 3, the angle maintaining inner surface (50A) has a plurality of inner circumferences having different radii, and in the present embodiment, has three short cylindrical inner surfaces (51), (52), (53) and two conical inner surfaces (54), (55). The conical inner surfaces (54), (55) connect the short cylindrical inner surfaces (51), (52), (53). By the operation of the rotary dial (12) and the first cylindrical member (40), the rotary member (25) rotates along the inner surface set by the short cylindrical inner surfaces (51), (52), (53) of the angle holding inner surface (50A).

In this embodiment, the cutting angle is 20 degrees when the rotating member (25) is in contact with the short cylinder inner surface (51), and similarly, the cutting angle is 26 degrees when the rotating member (25) is in contact with the short cylinder inner surface (52), and the cutting angle is 35 degrees when the rotating member (25) is in contact with the short cylinder inner surface (53). In addition, as the rotating member, other constituent members having a roller member may be used, for example, a rollable spherical member or the like may be used.

Next, the rotary dial (12) will be explained. As shown in fig. 1 and 2, the rotary dial (12) has a display window (16), a display window (17), and a direction indicating section (18). In this embodiment, the display window (16) and the display window (17) are opened to allow icons, characters, and the like described on the dial substrate (30) to be recognized, and the dial substrate (30) is formed on the rear surface of the rotary dial (12).

On the dial substrate (30), three kinds of icons (pencil images) of the pencil sharpening state shown in fig. 10 can be observed through the display window (16). Further, on the dial substrate (30), the writing core hardness characters ("HB-2B", "2B-4B", "6B-color pencil") as shown in FIG. 10 can be observed through the display window (17). Further, a sharpened pencil icon is displayed at a position indicated by the direction indicating section (18) on the upper surface of the main body (11). In addition, the shapes of the rotary dial (12), the display window (16), the display window (17), and the direction display section (18) can be changed as needed.

As shown in figure (2a), when the direction display part (18) of the rotary dial (12) faces upwards and is set to be 20 degrees, the pencil sharpener (10) sets a pencil sharpening angle of 20 degrees. At this time, the pencil icon shown in FIG. 10a is displayed on the display window 16, and the display window 17 displays that the pencil hardness is (HB-2B) as appropriate. Similarly, when the rotary dial (12) is rotated to the state of fig. 2B, the icon displaying 26 degrees and the pencil icon and the lead hardness matching therewith are (2B-4B), and when in the state of fig. 2c, the icon displaying 35 degrees and the lead hardness (6B-color pencil) are displayed. In addition, the shape and content of these icons or characters may be changed as desired.

Therefore, the user can grasp the current cutting state of the pencil sharpener (10) according to the position of the direction display part (18) and the icon on the body (11) displayed on the direction display part (18), the icon observed by the display window (16) and the hardness of the pencil lead observed by the display window (17).

Next, the action of the pencil sharpener (10) of the first embodiment will be described. First, the user can select the cutting state of the pencil according to the type of pencil, the hardness of the lead of the pencil, or the use state. The cutting angle is preferably 20 degrees when the hardness is HB-2B, 26 degrees when the lead hardness is 2B-4B, and 35 degrees when the lead hardness is 6B or more or a color pencil is used. In addition, when the user is a young child of an elementary school, it is desirable to increase the cutting angle.

As shown in fig. 2, 4 and 5, the cutting angle can be set to a desired angle by rotating the rotary dial (12). The user selects the cutting angle of the pencil by recognizing the position of the direction indicating part (18) of the rotary dial (12), the icon on the main body (11) indicated by the direction indicating part (18), the icon displayed on the display window (16), and the hardness of the pencil lead displayed on the display window (17).

As shown in fig. 2, 4, and 5, when the rotary dial (12) is rotated, the first cylindrical member (40) rotates with the rotation of the rotary dial (12). Thus, the cam groove (43) of the first cylindrical member (40) rotates to guide the projection (58) of the second cylindrical member (50). At this time, since the second cylindrical member (50) can move only along the insertion axis OP, the second cylindrical member (50) moves back and forth along the insertion axis OP at a predetermined position.

Then, the rotary dial (12) can rotate the holding inner surface (50A) to a prescribed position from an arbitrary angle, and the rotating member (25) of the blade holding member (22) can be brought into contact with the inner surface of the rotary dial (12) at the prescribed position, for example, with the short cylindrical inner surface (51). In addition, if the rotary dial (12) rotates to rotate the handle (14), the movement of the turning member (25) on the angle retaining inner surface (50A) is made easier.

In this state, the blade holding member (22) has a prescribed angle with respect to the insertion axis OP, a pencil is inserted into the insertion hole (13) and held by the holding portion (23), and when the handle (14) is rotated, the pencil P is conveyed by the conveying means (70) while being cut at the prescribed angle by the rotary blade portion (21).

Next, the effects of the pencil sharpener (10) will be explained. According to the pencil sharpener (10) of the present embodiment, the cutting angle suitable for the hardness of the pencil lead can be specified simply by rotating the dial (12).

In the cutting device (20), the rotary blade part (21) is reliably held by the angle holding inner surface (50A) of the rotating member (25) of the blade holding member (22) and the second cylindrical member (50), so that the rotary blade part (21) does not shake and a pencil can be stably cut.

In the above embodiment, the number of the short cylindrical inner surfaces of the angle retaining inner surface (50A) is set to three, but the number may be set to 2 or 4 or more, as a matter of course.

Second embodiment

Fig. 6(a) is a partial front view of the pencil sharpener of the second embodiment, and (b) is a sectional view of the pencil sharpener of the second embodiment. Next, a pencil sharpener (110) according to a second embodiment of the present invention will be explained. The pencil sharpener (110) of the present embodiment has a knob member (111), and the knob member (111) is an angle determining member for rotationally driving a first cylindrical member (40) and is provided protruding on the upper surface of a body (11) of the pencil sharpener (110).

Since the other configurations are the same as those of the pencil sharpener of the first embodiment, the same components are denoted by the same reference numerals and omitted.

According to the pencil sharpener (110) of the present embodiment, since the number of components can be reduced, a simple configuration is formed, and therefore, a pencil sharpener which can set a cutting angle simply and stably can be provided at low cost.

Third embodiment

FIG. 6(c) is a sectional view of a third embodiment of a pencil sharpener. In the pencil sharpener (120) of the present embodiment, the angle retaining inner surface (50A) of the second cylindrical member (50) is a blade angle retaining member, and the angle retaining inner surface (50A) is a conical inner surface (121) whose inner surface radius varies linearly along the insertion axis OP. Since the other configurations are the same as those of the pencil sharpener of the first embodiment, the same components are denoted by the same reference numerals and omitted.

According to the pencil sharpener (120) of the present embodiment, the cutting angle of the rotary blade part (21) with respect to the insertion axis OP can be set continuously and steplessly to a desired angle matching the hardness of the lead, and the cutting angle of the pencil can be changed continuously and steplessly.

Fourth embodiment

Fig. 7(a) is a sectional view of a fourth embodiment of a pencil sharpener. The pencil sharpener (130) of the present embodiment has a slide member (131), and the slide member (131) is an angle determining member, is provided protruding from the upper surface of the main body (11) of the pencil sharpener (130), is connected to the second cylindrical member (50) via a connecting member (132), and moves the second cylindrical member (50) along the insertion axis OP. The present pencil sharpener (130) does not have the rotary dial (12) or the first barrel component (40) of the pencil sharpener (10) of the first embodiment. Since the other configurations are the same as those of the pencil sharpener (10) of the first embodiment, the same components are denoted by the same reference numerals and omitted.

According to the pencil sharpener (130) of the present embodiment, a pencil sharpener capable of simply and stably setting a cutting angle can be provided at low cost.

Fifth embodiment

Fig. 7(b) is a sectional view of a pencil sharpener according to a fifth embodiment. The pencil sharpener (140) of the present embodiment has an operating lever member (141), and the operating lever member (141) is an angle determining member. The operating lever member (141) includes a fulcrum (142) and a connecting portion (143), the fulcrum (142) is provided at one end of the pencil sharpener body (11), the operating lever member (141) is connected to the second cylindrical member (50) via the connecting portion (143) between the operating force point and the fulcrum (142) with the other end as the operating force point, and the second cylindrical member (50) is a blade angle holding member. Thereby, the second cylindrical member (50) is linearly moved along the insertion axis OP. The present pencil sharpener (140) does not have the rotary dial (12) or the first barrel component (40) of the pencil sharpener (10) of the first embodiment. Since the other configurations are the same as those of the pencil sharpener (10) of the first embodiment, the same components are denoted by the same reference numerals and omitted.

The pencil sharpener (140) of the present embodiment can set the cutting angle simply and stably with a small force by the operation lever member (141).

Sixth embodiment

FIG. 8(a) is a sectional view of a pencil sharpener according to a sixth embodiment. The pencil sharpener (150) of the present embodiment has a second rotating member (151), and the second rotating member (151) is provided at a position symmetrical to the rotating member (25) about the insertion axis OP and at a side of a blade holding member (22) to which the rotary blade (21) is attached. The second rotating member (151) is rotatably provided at the tip end of the arm member (152), and the arm member (152) tilts about the tilt axis O1, and the second rotating member (151) rotates in contact with the angle-retaining inner surface (50A) in accordance with the movement of the second cylindrical member (50).

Since the pencil sharpener (150) of the present embodiment has the second rotating member (151) disposed at a position symmetrical to the rotating member (25), the second cylindrical member (50) can be driven stably without applying a biasing force to the second cylindrical member (50).

Seventh embodiment

Fig. 8(b) is a sectional view of a pencil sharpener according to a seventh embodiment. (c) An elevation view showing an example of a cam. The pencil sharpener (160) of the present embodiment has a plate cam (161) and a selection dial (163), the plate cam (161) being a blade angle holding member, and the selection dial (163) being an angle determining member. A plate cam (161) is in contact with a rear end portion (162) of the blade holding member (22) on the opposite side to the insertion side of the pencil to change the inclination angle of the rotary cutter portion (21) with respect to the insertion axis OP. As shown in fig. 8(c), the profile shape of the plate cam (161) has a concave-convex section that can change the angle of the rotary blade section (21) in stages.

The angle determining member is constituted by a selection dial (163), the selection dial (163) rotates a drive plate cam (161), and the plate cam (161) is provided on a shaft portion (handle shaft portion) of a handle (14) of the pencil sharpener.

In the pencil sharpener (160) of the present embodiment, by operating the selection dial (163), the plate cam (161) is rotated, and by the contact position with the rear end portion (162) of the blade holding member (22), the angle of the blade holding member (22) with respect to the insertion axis OP is changed. Therefore, the cutting angle of the pencil can be changed according to the hardness of the pencil lead by the simple operation of rotating the selection dial (163).

In the above embodiment, the profile of the plate cam (161) has a stepped cam (step cam), but as shown in fig. 8(d), the profile of the plate cam (161) may be a profile (step-less cam) in which the angle of the blade holding member (22) is continuously changed without a step.

Eighth embodiment

Fig. 9 shows a pencil sharpener according to an eighth embodiment of the present invention, where (a) is a cross-sectional view of the pencil sharpener and (b) is a perspective view of the same sharpener assembly. The pencil sharpener (170) of the present embodiment rotates the pencil and simultaneously rotates the rotary blade (21) by driving the handle (14). In addition, the position of the blade holding member (22) is changed by a position changing device (171), so that the inclination angle of the rotary knife part (21) relative to the insertion axis OP is set.

The rotating device (180) has a first gear (181), an extension shaft (183), a second gear (184), and a third gear (185). The first gear (181) is driven to rotate by the handle (14), the extension shaft (183) and the first gear (181) rotate coaxially, the second gear (184) is driven to rotate by the extension shaft (183), and the third gear (185) is meshed with the second gear (184) to rotate the transmission device (70). The fourth gear (182) is meshed with the first gear (181) to rotate the rotary cutter portion (21). With this device, the rotary blade part (21) is rotated by the driving of the handle (14), and the pencil P and the rotary blade part (21) are rotated relative to each other to sharpen the pencil.

The pencil sharpener (170) is provided with a position changing device (171), and the position changing device (171) is a blade angle holding member and an angle determining member. The position changing device (171) is in contact with the upper end of the blade holding member (22) and is set at a position perpendicular to the insertion axis OP (upper side in the figure). In addition, the angle between the blade holding member (22) and the insertion axis OP is pressed in the opening direction by the elastic member (24).

A position changing device (171) is in contact with the upper side of the blade holding member (22) to determine the position of the blade holding member (22). The position changing device (171) is composed of a rotary handle (172) and a transmission screw device (173).

In the pencil sharpener (170) of the present embodiment, since the rotary blade (21) does not revolve, it is not necessary to hold and determine the angle of the rotary blade (21) over the entire circumference, and the position changing device (171) can be easily used as the blade angle holding member and the angle determining member.

Possibility of industrial utilization

The pencil sharpener according to the present invention can freely and reliably specify the cutting angle of the pencil cutting portion according to the type and use of the pencil, and is industrially applicable.

Description of symbol mark

10 pencil sharpener

11 main body

11A front part

11B rear part

12 rotating dial (Angle determination parts)

13 inserting into the hole

14 handle

15 Pencil bits box

16 display window

17 display window

18 direction display part

19 guide rail

20 cutting device

21 rotary knife part

22 blade holding member

22A rotation shaft holding part

23 holding part

24 elastic member

25 rotating part

26 shaft

30 dial substrate

31 connecting part

40 first cylindrical part (Angle determining part)

41 bottom part

42 side wall part

43 cam groove

50 second cylindrical member (blade angle holding member)

50A angle retaining inner surface

51 short cylinder inner surface

52 short cylinder inner surface

53 short cylinder inner surface

54 conical inner surface

55 conical inner surface

56 guide projection

58 projection

60 handle gear

70 transfer device

110 pencil sharpener

111 knob parts (Angle determination parts)

120 pencil sharpener

121 conical inner surface

130 pencil sharpener

131 sliding parts (Angle determining parts)

132 connecting part

140 pencil sharpener

141 operating lever member (Angle determining member)

142 fulcrum

143 engaging part

150 pencil sharpener

151 second rotating member

152 arm member

160 pencil sharpener

161 plate cam (knife angle keeping component)

162 rear end portion

163 selection dial (Angle determination component)

170 pencil sharpener

171 position changing device (knife angle holding member, angle determining member)

172 rotating handle

173 screw conveying device

180 rotary device

181 first gear

182 fourth gear

183 extending shaft

184 second gear

185 third gear

O-shaped tilting shaft

O1 tilting shaft

OP inserting shaft

P pencil

Claims

1. A pencil sharpener characterized by having a holding portion for allowing a pencil to be inserted along an insertion axis and a rotary blade portion provided at a set inclination angle with respect to the pencil insertion axis while driving a leading end portion of the pencil by rotation of a handle to cut the leading end portion of the pencil at a set cutting angle;

the pencil sharpener includes a blade holding member for holding the rotary blade portion in the holding portion so as to be tiltable at a certain tilt angle about a tilt axis set in the holding portion;

an elastic member that applies a biasing force in the direction in which the inclination angle increases to the rotary blade portion;

a blade angle holding member that holds the inclination angle of the rotary blade at a constant angle;

an angle determining member capable of determining an inclination angle of the rotary blade portion according to a cutting angle suitable for the hardness of the pencil lead,

the blade angle-retaining member has an angle-retaining inner surface formed as a rotating surface having different radii about the insertion axis along the insertion axis;

the blade holding member has a rotating member that rotates in contact with the angle holding inner surface of the blade angle holding member;

the angle determining member rotates about the insertion axis to move the blade angle holding member forward and backward in the direction of the insertion axis.

2. The pencil sharpener as claimed in claim 1, wherein the blade portion angle retention member is formed in a cylindrical shape, the angle retention inner surface has inner peripheries of different radii, the angle retention inner surface is composed of a plurality of short cylindrical inner surfaces disposed at intervals in the insertion axis direction, and a conical inner surface disposed between the short cylindrical inner surfaces in connection with the short cylindrical inner surfaces, the conical inner surfaces having different radii.

3. The pencil sharpener of claim 1 wherein said angle-retaining inner surface of said blade angle-retaining member has a conical inner surface with a radius that varies linearly along said insertion axis.

4. The pencil sharpener as claimed in any one of claims 1 to 3, wherein the blade angle holding member has a protrusion on an outer peripheral surface, the angle determining member is formed in a cylindrical shape having a larger diameter than the blade angle holding member, is rotatably driven from the outside of the pencil sharpener, and covers the outside of the blade angle holding member, and the angle determining member has a cam groove for moving the blade angle holding member forward and backward when the protrusion of the blade angle holding member is inserted and the angle determining member is rotated.

5. The pencil sharpener of claim 1 wherein said angle determining means has a rotary dial disposed on the side of said pencil sharpener where said pencil is inserted, on which a pencil image representing the shape of the cutting angle of the selected pencil is displayed as an icon.

6. The pencil sharpener of claim 4 wherein said pencil sharpener has a knob member that is protrudingly disposed above said pencil sharpener to rotationally drive said angle determining member.

7. The pencil sharpener of claim 1 wherein said pencil is driven to rotate by said handle while spinning said rotary cutter to rotate said pencil relative to said rotary cutter to sharpen the pencil; the pencil sharpener includes a position changing mechanism for fixing the position of the blade holding member at a desired position, as the blade angle holding member and the angle determining member.

8. A pencil sharpener characterized by having a holding portion for allowing a pencil to be inserted along an insertion axis and a rotary blade portion provided at a set inclination angle with respect to the insertion axis while driving a leading end portion of the pencil by rotation of a handle to sharpen the leading end portion of the pencil at a set cutting angle;

the angle determining member includes a fulcrum provided at one end of the pencil sharpener body and an operating lever member that linearly moves the blade angle holding member along the insertion axis between an acting point and the fulcrum with the other end of the pencil sharpener body as the acting point.

9. A pencil sharpener characterized by having a holding portion for allowing a pencil to be inserted along an insertion axis and a rotary blade portion provided at a set inclination angle with respect to the pencil insertion axis while driving a leading end portion of the pencil by rotation of a handle to cut the leading end portion of the pencil at a set cutting angle;

the blade angle holding member has a plate cam which contacts a side of the blade holding member opposite to an insertion side of the pencil to change the inclination angle between the blade angle holding member and the insertion axis of the rotary blade; the angle determining member is a dial provided at a handle shaft portion of the pencil sharpener, and the dial can rotationally drive the plate cam.