JP3232734B2 - Electric pencil sharpener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pencil sharpener having a lead adjusting mechanism.

[0002]

2. Description of the Related Art A conventional electric pencil sharpener provided with a thinning mechanism for a pencil tip will be described with reference to FIGS. FIG. 5 is a cross-sectional view of a conventional electric pencil sharpener, FIG. 6 is a detailed view of a core adjusting mechanism of the conventional electric pencil sharpener when the tip is thin, and FIG. 7 is a conventional electric pencil sharpener. Is thicker
FIG. 8 is a detailed view of the core adjusting mechanism at the time of FIG. 9, and FIG.
FIG. 3 is a detailed view of a cutting mechanism when the core thickness of the conventional electric pencil sharpener is “thick”.

In FIG. 5, 1 is a case, 3 is a pencil insertion slot, 4 is a cutter holder, 5 is a cutter shaft, 6
Is a cutter, 7 is a reaction plate, 8 is a core contact plate, 13 is a chassis, 14 is a drive gear, 15 is an intermediate gear, 16 is a motor pinion, 17 is a motor unit, 20 is a core adjustment knob,
In FIG. 6, 19 is a pencil, 21 is a core adjustment spindle, 2
2 is a core adjustment cam, 23 is a core adjustment plate, 24 is a core adjustment plate fixing screw, 25 is a core adjustment cam installation plate, 26 is a fine adjustment screw hole, and 27 is a fine adjustment screw.

[0004] First, the driving system will be described. In FIG. 5, the rotational force of the motor unit 17 is transmitted to a motor pinion 16 installed at the tip, and rotates the intermediate gear 15,
By rotating the drive gear 14 pressed into the cutter holder 4, the cutter holder 4 rotatably attached to the chassis 13 is rotated.

Next, the cutting mechanism will be described. A cutter holder 4, a cylindrical cutter 6 rotatably provided on the cutter holder 4 with a cutter shaft 5, a leading end plate 8 pressed by the leading end of a pencil 19, and a pivotally attached to the leading end plate 8. A reaction plate 7 for sliding the cutter shaft 5 forward (to the right in the figure), and a core adjustment spindle 21 which serves as a fulcrum of the reaction of the reaction plate 7.

Then, as the pencil 19 is sharpened, the tip abutment plate 8 is pushed in, whereby the cutter shaft 5 is slid forward by the reaction plate 7 as shown in FIG. The annular concave step 28 formed on the outer periphery corresponds to the bearing 29 at the front, and the cutter shaft 4 is rotated by using the centrifugal force to rotate the cutter shaft 5 to the depth of the annular concave step 28 because the cutter holder 4 is rotating. The cutter 6 is displaced outward by a distance, that is, the cutter 6 is separated from the cutting surface of the pencil 19 to prevent excessive cutting. Further, by changing the position of the core adjusting plate 23 to which the core adjusting spindle 21 is fixed, the separation point of the cutter shaft 5, that is, the thickness of the core tip can be adjusted.

The tip adjustment mechanism will be described with reference to FIGS. When the tip of the pencil 19 is applied to the tip applying plate 8 at the position shown in FIG. 9, the cutting of the pencil 19 is performed in an early state, the cutter 6 escapes, and the tip of the pencil 19 is sharpened. Conversely, when the tip of the pencil 19 is applied to the tip abutment plate 8 at the position shown in FIG. 8, the pencil 19 is cut at the back, hits the tip abutment plate 8, the cutter 6 escapes, and the tip is sharpened into a thin state. Go up.

In FIG. 6 and FIG. 7, the positioning of the core abutment plate 8 is performed by a core adjustment spindle 21, a core adjustment plate 23, a core adjustment cam 22, and a fine adjustment screw hole 26. A core adjustment spindle 21 is inserted into a hole provided in the cutter holder 4, and the tip of the spindle 21 is in contact with the reaction plate 7. One end surface of the core adjustment spindle 21 contacts the core adjustment plate 23, and the protrusion of the core adjustment plate 23 contacts the core adjustment cam 22. The center adjustment is performed by a center adjustment knob 20 (see FIG. 5) connected to the center adjustment cam 22. A small step is provided around the periphery of the core adjustment cam 22 that comes into contact with the projection of the core adjustment plate 23, and the fine adjustment screw hole 2 is formed so that the core tip thickness becomes “thin”.
6, the fine adjustment screw 27 is tightened, and the core adjustment cam 22 is finely adjusted. When the core tip is thick, the core adjustment cam 2
The position of the core adjustment spindle 21 is changed by the step around the position 2.

[0009]

However, in the conventional core adjustment mechanism, the core tip abutment plate 8 and the core adjustment spindle 2 are required.
1. Accumulation of dimensional tolerance due to the combination of components such as the reaction plate 7, the core adjusting plate 23, the core adjusting cam 22, etc. is large, and fine adjustment is always required at the position setting where the core tip thickness is "thin". The number of parts was large, the structure was complicated, and the cost was high.

An object of the present invention is to provide an electric pencil sharpener which solves the above-mentioned problems, has a simple structure, does not require fine adjustment, and is inexpensive in terms of cost.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a receiving portion for slidably holding a core adjusting spindle in the longitudinal direction thereof, and a thickness of the core tip of the core adjusting spindle. A stopper attached to the "narrow" position setting place and abutting against the front of the receiving part, a core adjustment cam for adjusting the position of the core adjustment spindle, and a core attached to the core adjustment cam on the outer surface of the case An adjustment knob is provided.

[0012]

According to the present invention, the accuracy of the position setting when the core tip of the core adjusting mechanism is "thin" is determined by the positional accuracy of the stopper mounted on the core adjusting spindle. As a result, the number of components affecting the dimensional tolerance is reduced, and fine adjustment is not required.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals.

FIG. 1 is a perspective view of an electric pencil sharpener according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of the electric pencil sharpener according to one embodiment of the present invention, and FIG. FIG. 4 is a detailed view of the lead adjusting mechanism when the lead thickness of the pencil sharpener is “thin”. FIG. 4 is a lead adjustment when the lead thickness of the electric pencil sharpener is “thick” in one embodiment of the present invention. It is a detailed view of a mechanism.

1 and 2, reference numeral 1 denotes a case, and 2 denotes a core adjustment knob provided on the outer surface of the case 1. A pencil insertion slot 3 is formed on the wall surface of the case 1, and a cutter holder 4 is provided inside the pencil insertion slot 3. A cutter shaft 5 and a cutter 6 are provided along the cutter holder 4. 7 is a reaction plate, 8 is a core tip contact plate, 9 is a core adjustment spindle, and 10 is E
Ring, 11 is a core adjustment cam, 12 is a core adjustment cam mounting plate, 13 is a chassis, 14 is a drive gear, 15 is an intermediate gear, 16 is a motor pinion, 17 is a motor unit, FIG.
In the above, 30 is a spring, and 34 is a power switch. That is, a power switch 34 that is turned on when the pencil 19 is inserted is provided in the pencil insertion slot 3, and the power switch 34 is connected to a power circuit of the motor unit 17.

As shown in FIGS. 2 to 4, the cutting mechanism is provided with a cutter holder 4 having a pencil insertion portion, and is rotatably held on the cutter holder 4 by a cutter shaft 5, and is provided on one side of the pencil insertion portion. It consists of a cylindrical cutter 6 located. The cutter holder 4 is rotatably held by the case 1, and the rotation of the motor unit 17 is transmitted via a motor pinion 16, an intermediate gear 15, and a drive gear 14. The cutter 6 is adapted to rotate in a planetary manner by meshing an end gear 31 with an internal gear 32.

At the back of the pencil insertion portion of the cutter holder 4, there is provided a leading plate 8 slidably forward and backward, and a reaction plate 7 is pivotally attached to the leading plate 8. This reaction plate 7
The center portion contacts the front end of a core adjusting spindle 9 provided so as to penetrate the center of the pivot portion behind the cutter holder 4, and the free end contacts the rear end of the cutter shaft 5.

The cutter 6 is slidable back and forth, and is provided with an annular concave step 28 on the outer periphery of its front end. The bearing body 35 for receiving the front end of the cutter shaft 5 is provided with an annular concave step 28. It is formed with an inner width that fits into. The cutter shaft 5 is pressed to the left in the drawing by the repulsive force of the spring 30.

The center adjusting spindle 9 is located behind the reaction plate 7 and forms a reaction fulcrum. The center adjustment spindle 9 penetrates a hole provided in the cutter holder 4, and its tip is in contact with the back surface of the reaction plate 7. A groove 9a is provided in a portion of the core adjustment spindle 9 inserted into the cutter holder 4 (see FIG. 4), and an E-ring 10 is fitted therein. The core adjusting spindle 9 is slidably held in a lengthwise direction by a receiving part 4 a integral with the cutter holder 4. When the core thickness is "thin", the core adjusting spindle 9 is retracted to the left as shown in FIG.
a. That is, the E-ring 10 serves as a stopper for positioning the core adjustment spindle 9 at a position where the core tip thickness is “thin”. If the mounting position accuracy of the E-ring 10 is improved, the core tip thickness becomes “thin”. The accuracy at the time of "" can be obtained.

In FIG. 3, a core adjustment cam 11 is mounted on a core adjustment cam mounting plate 12 by screws 18 behind the core adjustment spindle 9. The core adjustment cam mounting plate 12 is installed on the chassis 13 perpendicular to the pencil insertion direction, and the rear end of the core adjustment spindle 9 is in contact with the core adjustment cam mounting plate 12. The core adjustment knob 2 is connected to the core adjustment cam 11 with the case 1 interposed therebetween, and is slidable in the lateral direction N (see FIG. 1). When the core adjustment knob 2 is slid in the lateral direction N in FIG. 1, the core adjustment cam 40 in FIG.
Also slides in the same direction (the direction orthogonal to the plane of the paper), and the lead adjusting spindle 9 is pushed by the lead adjusting cam 40 and slides in its length direction.

Hereinafter, the center adjustment mechanism having the above-described configuration will be described. The cutting of the pencil and the thickness of the tip are performed by changing the position of the tip contact plate 8 as in the conventional example. When the core tip is cut to a "thin" thickness, the lead adjustment mechanism cuts and sharpens the pencil 19, comes into contact with the tip contact plate 8 connected to the reaction plate 7, and pushes the cutter shaft 5. And run to the right. At this time, the E-ring 10 of the lead adjusting spindle 9 for determining the position of the leading end contact plate 8 stops at the front surface of the receiving portion 4a,
The core adjusting spider 9 is further moved and moved up in a state where the core tip thickness is "thin". When the thickness of the core tip is cut to “thick”, the core adjustment cam 11 is moved to the core adjustment knob 2.
To move the core adjustment spindle 9 to position the core abutment plate 8, thereby shaving up the core in a thick state.

[0022]

As described above, according to the present invention, the stopper is provided at the position where the core tip of the core adjustment spindle is "thin", so that the accumulation of dimensional tolerance due to the combination of parts is small, and the stopper is provided. Therefore, fine adjustment is unnecessary, the number of parts is small, the structure is simple, and an inexpensive electric pencil sharpener having a core adjustment mechanism can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electric pencil sharpener according to an embodiment of the present invention.

FIG. 2 is a sectional view of an electric pencil sharpener according to an embodiment of the present invention.

FIG. 3 is a detailed view of a lead adjusting mechanism when the lead thickness of the electric pencil sharpener according to the embodiment of the present invention is “thin”;

FIG. 4 is a detailed view of a lead adjusting mechanism when the lead thickness of the electric pencil sharpener according to the embodiment of the present invention is “thick”.

FIG. 5 is a sectional view of a conventional electric pencil sharpener;

FIG. 6 is a detailed view of a lead adjusting mechanism of the conventional electric pencil sharpener when the tip of the lead is "thin".

FIG. 7 is a detailed view of a lead adjusting mechanism when the lead thickness of the conventional electric pencil sharpener is “thick”.

FIG. 8 is a detailed view of a cutting mechanism when the core thickness of the conventional electric pencil sharpener is “thin”.

FIG. 9 is a detailed view of a cutting mechanism when the core thickness of the conventional electric pencil sharpener is “thick”.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Core adjustment knob 3 Pencil insertion slot 4 Cutter holder 4a Receiving part 5 Cutter shaft 6 Cutter 7 Reaction plate 8 Core tip backing plate 9 Core adjustment spindle 9a Groove 10 E ring (stopper) 11 Core adjustment cam 17 Motor part 40 core Adjustment cam

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 54-110250 (JP, U) Japanese Utility Model Showa 57-81197 (JP, U) Japanese Utility Model Showa 51-1043 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B43L 23/02

Claims (2)

(57) [Claims] 1. A case having a pencil insertion slot, a cutter holder, a cutter shaft, and a cutter provided inside the pencil insertion slot, a motor unit for rotating the cutter, and a sliding part at the back of the cutter holder. A freely adjustable core abutment plate, a reaction plate pivotally attached to the core abutment plate and abutting against the rear end of the cutter shaft, a core adjustment spindle abutting on the rear surface of the reaction plate, and a core adjustment A receiving portion for slidably holding the spindle in the longitudinal direction thereof, a stopper attached to a position setting position where the core tip of the core adjusting spindle is "small" and abutting against a front surface of the receiving portion; An electric pencil sharpener comprising: a core adjusting cam for adjusting a position of a core adjusting spindle; and a core adjusting knob on an outer surface of the case and connected to the core adjusting cam. 2. An electric pencil sharpener according to claim 1, wherein said stopper is an E-ring, and is mounted in a groove formed in said lead adjusting spindle.