JP2005111776A - Electric pencil sharpener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely realize a function of not driving a cutter holder to rotate even when a pencil is inserted on the occasion when a shavings case is not loaded, or the like, by a simple structure. <P>SOLUTION: A longitudinal movement component 12 which pushes in a push button 11a of a microswitch 11 by the movement to a case front part 1, a lever component 13 which is rotated toward the case front part 1 with the insertion of the pencil P, and a vertical movement component 14 which is pushed in upward, deforming elastically a resin spring portion 14a, with loading of the shavings case 10, are provided. The longitudinal movement component 12 has a part 12b of connection with a lever end 13b of the lever component 13, a projection 12c projecting toward the case front part 1 and a resin spring portion 12d. In the vertical movement component 14, a recess 14c hollow toward the case front part 1 is formed. By the vertical movement component 14 being pushed in with loading of the shavings case 10, the projection 12c is made capable of entering into the recess 14c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in an electric pencil sharpener having a structure that has a removable waste case and that does not operate so as to sharpen the pencil even when the pencil is inserted from the pencil insertion slot when the waste case is removed.

  In the type of electric pencil sharpener that operates when a pencil is inserted into the pencil insertion slot, when the waste case is removed, it does not work even if a pencil is inserted from the pencil insertion slot. There is a demand to stop the energization of the motor that rotates the cutter holder that is provided with a cutting space that receives the pencil and cuts at the receiving location.

  In order to give such a function to the electric pencil sharpener, a mechanism is required to prevent the motor drive circuit from being closed even when a pencil is inserted when the waste case is removed.

  The main problem to be solved by the present invention is that the cutter holder is not rotated even when a pencil is inserted when the waste case is not loaded, and the cutter holder is rotated when the pencil case is loaded, When the pencil is extracted from here, the function of stopping the rotational driving of the cutter holder can be surely realized with a simple structure.

In order to solve the above problems, in the present invention, the electric pencil sharpener has the following configurations (1) to (11).
(1) Has a pencil insertion slot at the front of the case,
(2) Inside the case, a pencil inserted from the pencil insertion opening is received, and a cutting space is formed between the peripheral surface of the rotary blade that narrows for a while as it goes to the back of the case where the received pencil is cut. A cutter holder that rotatably holds the rotary blade and is driven to rotate by a motor,
(3) An electric pencil sharpener having a waste case removably loaded inside the case from the front of the case to a position where the pencil shavings generated from the cutting space are received and stored.
(4) Inside this electric pencil sharpener case,
(5) a micro switch provided in the motor drive circuit and arranged to push the push button against the urging of the push button, and to close the drive circuit and to project the push button toward the back of the case; ,
(6) It has a front end directed to the front part of the case and a rear end directed to the back part of the case, and the push button of the microswitch is moved between the front end and the rear end by moving toward the front part of the case Longitudinal moving parts with a butting part to this push button to push in,
(7) A lever part including a contact portion that is pressed in contact with the pencil as the pencil is inserted into the pencil insertion opening, and a lever end that is rotated toward the front of the case by the pressing of the contact portion. When,
(8) It has a resin spring part, and is equipped with a vertically moving part that is pushed upward while elastically deforming the resin spring part as the waste case is loaded inside the case.
(9) Moreover, the back and forth parts are
A connection with the lever end of the lever part,
A protrusion that protrudes toward the front of the case and is located on the side of the edge facing the back of the case in the vertically moving part, or a recess that is recessed toward the back of the case,
It has a resin spring part that integrally joins this connection part and the formation part of the protrusion or recess,
(10) Further, the edge directed toward the back of the case in the vertically moving part has a recess recessed toward the front part of the case or the edge directed toward the front of the case adjacent to the recessed part in the longitudinally moving part. A protrusion that is located on the side of the part and protrudes toward the back of the case is formed,
(11) The protrusion can enter the recess by pushing the vertically moving part upward along with the loading of the waste case.

According to such a configuration,
(1) When the waste case is not loaded, the vertically moving parts are not pushed upward, and the protrusion cannot enter the recess. In this state, when a pencil is inserted into the pencil insertion slot, the lever end of the lever part is rotated toward the front part of the case, and this rotation causes a force toward the front part of the case to act on the forward and backward movement parts. In the state where the vertically moving part is not pushed in, the protrusion cannot enter the recess, so that only the resin spring part of the longitudinally moving part extends due to elastic deformation, and the microswitch is pushed by the abutting part of the longitudinally moving part. It is possible to prevent the entire forward / backward moving part from being moved so as to push the button. Thereby, in the state which extracted the waste case, even if it inserts a pencil in a pencil insertion port, it can be made not to supply with electricity to the motor which rotates a cutter holder.
(2) In a state where the waste case is loaded, the vertically moving parts are pushed upward, and the protrusion enters the recess. In this state, when a pencil is inserted into the pencil insertion slot, the lever end of the lever part is rotated toward the front part of the case, and the forward / backward moving part can be moved forward by this rotation. By the movement of the forward / backward moving parts, the abutting portion pushes the push button of the micro switch, and the motor for rotating the cutter holder can be energized.
(3) When the scraped pencil is pulled out while the waste case is loaded, the forward / backward moving parts are moved to the original position on the back side of the case by the urging force of the push button of the micro switch, and the motor is de-energized. At the same time, the lever end of the lever part that has been turned to the front side of the case is also turned to the back side of the case, and the contact part of the lever part is also returned to the position before the insertion of the pencil. When the waste case is extracted again from this state, the vertically moving part is moved downward to a position where the protrusion does not enter the recess by elastic return of the resin spring portion in the vertically moving part.

The cutter holder is provided with a pin body which is gradually pressed into the back of the case by being gradually narrowed toward the back of the cutting space by gradually reducing the tip of the pencil by cutting in the cutting space. And
Inside the case of the electric pencil sharpener is equipped with driven parts that are pushed by the pin body protruding in this way and moved toward the back of the case,
In addition, it is possible to form a catching portion that is caught on the driven part only when the driven part is moved to the case back side on the rear end side of the longitudinally moving part.

  In this case, the lever end of the lever part is rotated toward the front part of the case by inserting the pencil, and this rotation moves the forward / backward moving part forward while inserting the protrusion into the recess. Thus, when the cutter is in the rotationally driven state of the cutter switch in which the abutting portion pushes in the push button of the micro switch by the movement of the forward / backward moving parts, when the pencil enters the predetermined position, that is, the pencil is shaved to the predetermined thickness. In this case, the forward / backward moving part can be moved toward the back of the case through the pin body pushed and protruded by the pencil that has entered in this way and the driven part, and by moving the forward / backward moving part, the pencil has a predetermined thickness. Even if it is shaved, the press of the push button of the micro switch at the end of the forward / backward moving parts is released to remove the cutter holder. The energization of the motor for rotation driving and can be stopped.

  According to the electric pencil sharpener according to the present invention, the cutter holder is not rotated even when the pencil is inserted when the waste case is not loaded, and the cutter holder is rotationally driven when the pencil case is loaded. The function to stop the rotation drive of the cutter holder when the pencil is extracted from the machine can be realized simply and reliably by the four parts of the micro switch, lever part, forward / backward movement part, and vertical movement part.

  The best mode for carrying out the present invention will be described below with reference to FIGS.

  Here, FIGS. 1 to 5 are cross-sectional views of the pencil sharpener according to this embodiment in the front-rear direction so that the main part of the internal mechanism can be seen. In particular, FIG. 2 shows a state in which the pencil P is inserted from the state of FIG. 1, FIG. 3 shows a state in which the waste case 10 is loaded from the state of FIG. 1, and FIG. 4 shows a state in which the pencil P is inserted from the state of FIG. FIG. 5 shows a state where the pencil P is shaved from the state shown in FIG. 6 and 7 show the pencil sharpener in cross section at a position slightly behind the position of FIGS. 1 to 5, and FIG. 7 particularly corresponds to the state of FIG. FIG. 8 shows the internal mechanism as viewed from the right side of FIG. 1 so that the pencil sharpening drive mechanism can be easily understood. 9 shows a state in which only the longitudinal movement part 12 is attached to the side portion of the upper chamber 4, FIG. 10 shows a state in which the vertical movement part 14 is further attached thereto, and FIG. The state in which the support member 11b of the microswitch 11 is attached is shown, and FIG. 12 shows the state in which the respective components are separated as a perspective state.

  The electric pencil sharpener according to this embodiment has a removable waste case 10 and, when the waste case 10 is removed, even if the pencil P is inserted from the pencil insertion opening 3, it does not operate to sharpen the pencil P. It has a structure.

  This pencil sharpener has a pencil insertion opening 3 in the case front 1.

Also, this pencil sharpener
(1) Cutter holder 9
(2) Waste case 10
(3) Micro switch 11
(4) Longitudinal moving parts 12
(5) Lever parts 13
(6) Vertical movement parts 14
have.

(Cutter holder 9)
The cutter holder 9 is arranged inside the case and has a cutting space 9a for receiving the pencil P inserted from the pencil insertion opening 3 of the case front 1 and cutting the received pencil P.

  The cutting space 9a is formed to be narrowed for a while as it goes from the case front part 1 to the case back part 2.

  The cutter holder 9 rotatably holds the rotary blade 9b, and the cutting space 9a is formed between the cutter blade 9 and the peripheral surface of the rotary blade 9b.

  The cutter holder 9 is rotationally driven by a motor (not shown) disposed inside the case.

  Specifically, in the illustrated example, the cutter holder 9 is arranged so that the rotation axis is along the longitudinal direction of the pencil sharpener (left and right direction in FIG. 1) in the upper chamber 4 of the pencil sharpener. As a whole, it is stored in a rotatable manner. The front end of the cutter holder 9 is rotatably supported on the front wall of the upper chamber 4, and the rear end of the cutter holder 9 is rotatably supported on the rear wall of the upper chamber 4.

  The cutter holder 9 has a pair of support portions 9c and 9c of the rotary blade 9b between the front and rear ends, and one end of the worm-shaped rotary blade 9b can be rotated to one of the pair of support portions 9c and 9c. The other end of the rotary blade 9b is rotatably supported by the other of the pair of support portions 9c and 9c. Further, between the pair of support portions 9c and 9c of the cutter holder 9, the imaginary horizontal line passing through the axis center of the pencil P inserted from the pencil insertion port 3 is moved toward the insertion destination side of the pencil P. An inclined surface portion 9d that is inclined in a direction approaching gradually is formed. At the same time, the rotary blade 9b also tilts its axis of rotation gradually toward the insertion destination side of the pencil P with respect to a virtual horizontal line passing through the axis center of the pencil P inserted from the pencil insertion port 3 Has been. As a result, a cutting space 9a is formed between the peripheral surface of the rotary blade 9b and the inclined surface portion 9d of the cutter holder 9 that gradually narrows toward the case back 2 as described above. .

  At the front end of the cutter holder 9, an introduction hole 9e for guiding the pencil P inserted from the pencil insertion port 3 into the cutting space 9a is formed. Further, a pinion portion 9f is formed on the rear end side of the rotary blade 9b so as to engage with the circulating rack 4a formed on the rear wall of the upper chamber 4. When the cutter holder 9 is rotated, the cutter is moved along with the rotation. The rotary blade 9b is rotated in the holder 9. One end of the pencil P inserted into the cutting space 9a through the pencil insertion opening 3 and the introduction hole 9e is cut so as to gradually approach the cone by the rotating blade 9b in the cutter holder 9 thus rotated. As the cutting progresses, it enters the inner side of the cutting space 9a, and one end of the pencil P is narrowed for a while.

  In the illustrated example, a motor (not shown) is arranged on the side of the upper chamber 4, and at the rear end of the cutter holder 9 protruding outward from the rear wall of the upper chamber 4. A final gear 15 is provided. On the case back 2 side, an intermediate gear 17 that meshes with a drive gear 16 provided on a drive shaft of the motor meshes with the final gear 15, and the cutter holder 9 is rotated by driving the motor. It is supposed to be.

  In the example shown in the drawing, the tip of the pencil P is gradually narrowed into the cutter holder 9 by cutting in the cutting space 9a and gradually approached further into the cutting space 9a. A pin body 9g that is pushed and protrudes toward the case back portion 2 side is provided.

  Specifically, in the illustrated example, a slide space 9 i of a frame body 9 h is formed in the cutter holder 9 following the inner back side of the cutting space 9 a, and the rear end of the cutter holder 9. When the frame body 9h is moved to the case back portion 2 side in the slide space 9i in the operation hole 9j along the rotation axis of the cutter holder 9 formed in the portion, the frame body 9h is pressed by the frame body 9h and the cutter is moved. A pin body 9g protruding from the rear end of the holder 9 is accommodated. The frame body 9h is slidable in the front-rear direction to a position where it hits a hole opening facing the slide space 9i in the operation hole 9j. . (FIG. 7) Since the piece 9h cannot be pushed in by the tip of the pencil P beyond this contact position, the further entry of the pencil P is restricted, and the pencil P is prevented from being excessively shaved.

(Trash case 10)
The waste case 10 is configured to be detachably loaded from the case front 1 of the electric pencil sharpener to the position where the pencil P shavings generated from the cutting space 9a are received and stored.

  Specifically, in the illustrated example, a lower chamber 5 is formed below the upper chamber 4 in which the cutter holder 9 is housed, and the upper chamber 4 is opened downward, The open portion communicates with the lower chamber 5. The lower chamber 5 is opened at the case front portion 1, and the waste case 10 can be inserted into and loaded into the lower chamber 5 from an opening 5 a of the lower chamber 5, and can be removed.

  The waste case 10 has a box shape with the upper surface released, and is loaded from the case front 1 with the released upper surface facing up. And in the waste case 10 loaded in this way, the shavings of the pencil P generated from the upper chamber 4, that is, generated by the cutting of the pencil P in the cutting space 9 a, is dropped and stored. Yes.

(Micro switch 11)
The micro switch 11 is provided in the drive circuit of the motor and is arranged inside the case of the electric pencil sharpener.

  The micro switch 11 is disposed so as to close the drive circuit by pushing the push button 11 a and to project the push button 11 a toward the case back 2.

  Specifically, the microswitch 11 is provided in a state in which the push button 11a is urged in a direction in which the push button 11a is always protruded outward by a biasing means such as a spring incorporated therein. When the push button 11a is pushed against the bias, the drive circuit is closed, and when the push button 11a is not pushed, the drive circuit is opened.

  In the illustrated example, the microswitch 11 is provided on the outer wall portion of the upper chamber 4 on the side opposite to the side facing the motor mounting side. It is attached.

  In the illustrated example, the support member 11b of the substantially L-shaped micro switch 11 has one arm directed toward the case back 2 side and the other arm arranged in the vertical direction. A corner of 11b is screwed to the upper chamber 4 and a micro switch 11 is provided on the other arm of the support member 11b.

(Previous parts 12)
The forward / backward moving parts 12 are arranged inside the case so as to be movable in the front / rear direction of the electric pencil sharpener.

Such forward / backward moving parts 12 are:
(1) a front end directed to the case front 1;
(2) a rear end directed to the case back 2;
(3) Between the front end and the rear end, the abutting portion 12a against the push button 11a that pushes the push button 11a of the micro switch 11 by the movement of the longitudinally moving part 12 toward the case front portion 1;
(4) a connecting portion 12b with a lever end 13b of a lever part 13 to be described later,
(5) A protrusion 12c that is located on the side of the edge 14b directed to the case back 2 in the vertically moving part 14 to be described later and protrudes toward the case front 1;
(6) It has the resin spring part 12d which joins this connection part 12b and the formation part of the protrusion 12c integrally.

  Specifically, in the illustrated example, the forward / backward moving part 12 has an intermediate part 12e provided with a long hole 12f extending in the front-rear direction of the electric pencil sharpener in a penetrating state, and this intermediate part 12e. A boss portion 6 having a screw hole into which a screw 7 for screwing the support member 11b of the microswitch 11 is screwed is inserted into the long hole 12f of the microswitch 11, and is provided on the outer wall portion of the upper chamber 4. . The intermediate portion 12e is provided with the abutting portion 12a that extends upward by integrally joining the lower end to the intermediate portion 12e. The forward / backward moving part 12 is positioned so that the tip of the abutting part 12a is always in contact with the push button 11a of the micro switch 11 from the case back part 2 side of the forward / backward moving part 12. That is, in the example shown in the drawing, the forward / backward moving part 12 is moved back and forth within the range of the movement stroke of the push button 11a of the microswitch 11.

  At the rear end of the intermediate portion 12e, a rod-shaped portion 12g extending toward the case back portion 2 with the front end integrally connected to the rear end is formed. A disc-shaped head portion 12h is formed at the end of the rod-shaped portion 12g, and on the side opposite to the side facing the outer wall portion of the upper chamber 4 in the longitudinally moving part 12, there is a middle portion of the rod-shaped portion 12g. A rib 12i is formed starting from the connecting portion between the rod-shaped portion 12g and the intermediate portion 12e and extending to a position where it slightly enters the intermediate portion 12e. The rib 12i functions as the protrusion 12c. It is like that.

  Further, the rear end of the band-shaped body 12j that is bent in a waveform so as to be alternately provided with an upper curved portion and a lower curved portion is integrally connected to the front end of the intermediate portion 12e. It is comprised so that it can extend elastically by expanding between the bending points which fit. That is, in the example shown in the figure, the belt-like body 12j functions as the resin spring portion 12d. In the illustrated example, the front end of the strip 12j is a connecting portion 12b with the lever end 13b of the lever part 13. The belt-like body 12j is configured to be elastically deformed with a force smaller than a force for pushing the push button 11a of the micro switch 11 against the bias. The longitudinally moving part 12 is typically formed by plastic injection molding so as to have these parts integrally.

(Lever parts 13)
The lever part 13 is rotated toward the case front part 1 by the pressing of the contact part 13a and the contact part 13a pushed in contact with the pencil P as the pencil P is inserted into the pencil insertion slot 3. Lever end 13b.

  Specifically, in the illustrated example, the lever part 13 includes a main shaft portion 13c having an axis line along the horizontal direction of the electric pencil sharpener, and a lever integrally connected to one end portion of the main shaft portion 13c. Arm 13e. One end of an extension shaft portion 13d having an axis line along the left-right direction of the electric pencil sharpener is integrally connected to the end portion of the lever arm 13e, and the extension shaft portion 13d functions as the lever end 13b. ing.

  The main shaft portion 13 c is rotatably supported by the front wall portion of the upper chamber 4 below the pencil insertion port 3 and is inserted through the notch 3 a formed at the lower portion of the pencil insertion port 3. It has a contact portion 13a having a protruding shape that enters into the mouth 3.

  In a state where the contact portion 13a enters the pencil insertion slot 3, the lever arm 13e pushes the end of the lever arm 13e, that is, the lever end 13b, rather than a virtual vertical line passing through the axis of the main shaft portion 13c. It is designed to be located on the case back 2 side. (FIG. 3 / hereinafter, the position of the lever part 13 is referred to as a reference position.)

  On the other hand, in a state where the contact portion 13a is pushed downward by inserting the pencil P into the pencil insertion slot 3, the lever arm 13e is more than the virtual vertical line passing through the axis of the main shaft portion 13c. The end (lever end 13b) is positioned on the case front 1 side. (FIG. 4 / hereinafter, the position of the lever part 13 is referred to as an operation position.)

  The front end of the resin spring portion 12d of the front / rear moving part 12, that is, the connecting portion 12b, is shaped so as to hold the extension shaft portion 13d of the lever part 13 from the front. At the reference position, the resin spring portion 12d of the longitudinally moving part 12 is not positively elastically deformed.

(Vertical movement part 14)
The vertically moving part 14 has a resin spring portion 14a, and is configured to be pushed upward while elastically deforming the resin spring portion 14a as the waste case 10 is loaded inside the case. .

  Further, a recess 14c that is recessed toward the case front portion 1 is formed in the edge portion 14b that faces the case back portion 2 of the vertical movement part 14, and the vertical movement part 14 that accompanies the loading of the waste case 10 is formed. The protrusion 12c of the longitudinally moving part 12 can enter the recessed part 14c of the vertically moving part 14 by being pushed upward.

  Specifically, in the illustrated example, the vertically moving part 14 has a base portion 14d that is pivotally supported on the front end side of the boss portion 6 and extends in the front-rear direction. The rear end side is configured to be movable in the vertical direction. Further, the vertically moving part 14 is positioned so as to be sandwiched between the vertically moving part 12 and the support member 11b.

  The base 14d has the recess 14c at the edge 14b facing the case back portion 2, that is, at the rear edge. Of the edge portion 14b of the base portion 14d, the edge portion 14b positioned above the recess 14c is not moved by the abutting portion 12a of the longitudinal movement part 12 so that the push button 11a of the microswitch 11 is not pushed in. At the position, the protrusion 12c of the longitudinally moving part 12 comes into contact with the front.

  The upper end of the base part 14d of the vertically moving part 14 is integrally connected to the lower end of a band-like body 14e bent in a waveform so as to alternately include a front curve part and a rear curve part. 14e is comprised so that it can shrink | contract elastically so that between adjacent bending locations may be narrowed. That is, in the example shown in the figure, the strip 14e functions as the resin spring portion 14a. The upper end of the belt-like body 14e is abutted from below with a stopper piece 4b formed on the side of the upper chamber 4, and the vertically moving part 14 is located on the rear end side while the belt-like body 14e is elastically contracted. It is designed to move upward.

  A projecting portion 14 f that protrudes downward so as to enter the lower chamber 5 is formed at the lower part of the rear end side of the base portion 14 d of the vertically moving part 14. The projecting portion 14f is inclined so that the edge on the side facing the case front portion 1 gradually approaches the case back portion 2 side from the connection side with the base portion 14d toward the projecting end of the projecting portion 14f. The cam edge 14g is used.

  In the illustrated example, when the waste case 10 is removed, the vertically moving part 14 is not pushed upward, and the protrusion 12c of the longitudinally moving part 12 is inserted into the recess 14c from the rear. Not positioned (FIG. 1) On the other hand, when the waste case 10 is loaded, the protruding portion 14f hits the upper edge of the waste case 10, and the vertical movement part 14 is pushed upward while the resin spring portion 14a is elastically deformed by the contact. It is like that. When the vertically moving part 14 is pushed in in this way, the protrusion 12c of the longitudinally moving part 12 can enter the recess 14c of the vertically moving part 14. (FIG. 3) The up-and-down moving part 14 is typically formed by plastic injection molding so that these parts are integrated.

(function)
(1) In a state where the waste case 10 is not loaded, the vertically moving part 14 is not pushed upward, and the protrusion 12c of the longitudinally moving part 12 cannot enter the recess 14c of the vertically moving part 14. In this state, when the pencil P is inserted into the pencil insertion slot 3, the lever end 13b of the lever part 13 (the end of the lever arm 13e and the extension shaft portion 13d) is rotated toward the case front 1, and this rotation causes A force toward the front part 1 of the case is applied to the front / rear moving part 12, but when the vertical moving part 14 is not pushed in this way, the protrusion of the front / rear moving part 12 is inserted into the recess 14 c of the vertical moving part 14. Since 12c cannot enter, only the resin spring portion 12d of the forward / backward moving part 12 extends due to elastic deformation, and the entire forward / backward moving part 12 moves so that the push button 11a of the micro switch 11 is pushed by the abutting part 12a of the forward / backward moving part 12 You can prevent it from happening. (FIG. 2) Thereby, in the state which extracted the waste case 10, even if it inserts the pencil P in the pencil insertion port 3, it can be made not to supply with electricity to the motor which rotates the cutter holder 9. FIG.

(2) In the state in which the waste case 10 is loaded, the vertically moving part 14 is pushed upward, and the protrusion 12 c of the longitudinally moving part 12 can enter the recess 14 c of the vertically moving part 14. In this state, when the pencil P is inserted into the pencil insertion slot 3, the lever end 13b of the lever part 13 is rotated toward the front part 1 of the case, and by this rotation, the longitudinally moving part 12 becomes the recess 14c of the vertically moving part 14. It is moved forward while inserting the protrusion 12c. By the movement of the forward / backward moving part 12, the abutting portion 12a pushes the push button 11a of the micro switch 11, and the motor for rotating the cutter holder 9 is energized. (Fig. 4)

(3) When the scraped pencil P is pulled out with the waste case 10 loaded, the forward / backward moving part 12 is moved to the original position on the case back 2 side by the urging force of the push button 11a of the micro switch 11, and the motor As a result, the lever end 13b of the lever part 13 that has been turned to the case front part 1 side is also turned to the case back part 2 side and the contact part 13a of the lever part 13 is turned off. Is also returned to the position before insertion of the pencil P. When the waste case 10 is extracted again from this state, the vertically moving part 14 moves downward to a position where the protrusion 12c of the longitudinally moving part 12 does not enter the recess 14c by the elastic return of the resin spring portion 14a in the vertically moving part 14. Moved.

  That is, the electric pencil sharpener according to this embodiment has such a function, that is, the cutter holder 9 is not rotated even when the pencil P is inserted when the waste case 10 is not loaded, and the pencil P is inserted when the waste case 10 is loaded. As a trigger, the cutter holder 9 is driven to rotate, and when the pencil P is extracted from the cutter holder 9, the cutter holder 9 is stopped from rotating. The micro switch 11, the lever part 13, the longitudinally moving part 12, and the vertically moving part 14 With the four parts, it has the feature that can be realized simply and reliably.

(Other characteristic structures)
Further, in this embodiment, the tip of the pencil P that is gradually narrowed toward the back of the cutting space 9a after the tip of the pencil P is gradually narrowed into the cutter holder 9 by cutting in the cutting space 9a. Is provided with the pin body 9g that is pushed by and protrudes toward the case back 2 side,
Inside the case of the electric pencil sharpener is provided with a driven part 18 which is pushed by the pin body 9g protruding in this way and moved toward the case back 2 side,
In addition, a hooking portion 12k that is caught by the driven part 18 is formed on the rear end side of the longitudinally moving part 12 only when the driven part 18 moves to the case back 2 side.

  Specifically, in the illustrated example, the lower end side is pivotally assembled to the back surface of the back panel 8 in which the upper chamber 4 and the motor are arranged on the front side, and the upper end side is separated from the back panel 8. A plate-like driven part 18 is provided which is movable in the direction to be taken out and has an upper end corner 18a positioned on the side of the tip of the pin body 9g. The follower part 18 is formed with a hole 18b having a hole diameter smaller than that of the head 12h provided at the end of the rod-like part 12g while allowing the rod-like part 12g of the longitudinally-moving part 12 to pass through. Yes. In this embodiment, when the pin body 9g is protruded by the approach of the pencil P to the predetermined position, the pin body 9g protrudes to the predetermined position by this approach toward the case back 2 side. The head part 12h of the longitudinal movement part 12 is caught by the driven part 18 that has been moved, and the longitudinal movement part 12 is also moved to the case back 2 side. That is, in the illustrated example, the head portion 12h of the forward / backward moving part 12 functions as the hooking portion 12k.

  Thereby, in this embodiment, the lever end 13b of the lever part 13 is rotated toward the case front part 1 side by inserting the pencil P, and this rotation causes the recess part 14c of the vertical movement part 14 to rotate. In the rotational drive state of the cutter holder 9 in which the forward / backward moving part 12 is moved forward while the protrusion 12c is inserted and the abutting part 12a pushes the push button 11a of the micro switch 11 by the movement of the forward / backward moving part 12. When the pencil P enters a predetermined position, that is, when the pencil P is shaved to a predetermined thickness, the resin spring is passed through the pin body 9g and the driven part 18 that are pushed and protruded by the pencil P that has entered in this way. The longitudinally moving part 12 can be moved toward the case back 2 side while extending the portion 12d. Therefore, even when the pencil P is sharpened to a predetermined thickness, the energization of the motor for rotating the cutter holder 9 is stopped by releasing the push button 11a of the micro switch 11 by the abutting portion 12a of the forward / backward moving part 12. Can do. (FIG. 5) When the pencil P is extracted after the energization is stopped, the rear end side of the longitudinally moving part 12 is slightly moved to the case front part 1 side due to the elastic return of the resin spring portion 12d of the longitudinally moving part 12, and this movement causes the driven part 18 to move. Also, the pin body 9g is slightly pushed back toward the cutting space 9a by the movement of the driven part 18.

  In this embodiment, an operation hole 2a formed so that the driven part 18 can be looked into from the outside is provided in the case back portion 2 of the electric pencil sharpener, and the pin protruding as described above is provided. The body 9g can be pushed again into the case front 1 side by inserting the pencil P or the like through the operation hole 2a and pushing the driven part 18 toward the case front 1 side. When the pin body 9g is pushed, the frame body 9h is also pushed into the case front 1 side in the slide space 9i, and the broken pencil P core remains in the cutting space 9a. This can be pushed down to the lower chamber 5 side by the piece 9h pushed in.

Pencil sharpener side cross-sectional configuration diagram Pencil sharpener side cross-sectional configuration diagram Pencil sharpener side cross-sectional configuration diagram Pencil sharpener side cross-sectional configuration diagram Pencil sharpener side cross-sectional configuration diagram Pencil sharpener side cross-sectional configuration diagram Pencil sharpener side cross-sectional configuration diagram Rear view of main part of internal mechanism of pencil sharpener Side view showing the state of assembly of main parts Side view showing the state of assembly of main parts Side view showing the state of assembly of main parts Separation perspective view of essential parts

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case front part 2 Case back part 3 Pencil insertion slot 9 Cutter holder 9a Cutting space 9b Rotating blade 10 Waste case 11 Micro switch 11a Push button 12 Forward / backward moving part 12a Butting part 12c Protrusion 12d Resin spring part 13 Lever part 13a Contact part 13b Lever end 14 Vertical movement parts 14a Resin spring part 14b Edge part 14c Recess

Claims (2)

Has a pencil insertion slot at the front of the case,
To receive a pencil inserted from the pencil insertion opening inside the case, and to form a cutting space between the peripheral surface of the rotary blade that narrows for a while as it goes to the back of the case where the received pencil is cut, A cutter holder that rotatably holds the rotary blade and is driven to rotate by a motor;
An electric pencil sharpener having a waste case removably loaded inside the case from the front of the case to a position where the pencil shavings generated from the cutting space are received and stored,
Inside this electric pencil sharpener case,
A micro switch provided in the motor drive circuit to close the drive circuit by pushing against the urging of the push button, and to project the push button toward the back of the case; and
This push that has a front end that faces the front of the case and a rear end that faces the back of the case, and pushes the push button of the microswitch between the front and rear ends by moving toward the front of the case Longitudinal moving parts with butting parts to the buttons,
A lever part comprising a contact part that is pressed in contact with the pencil as the pencil is inserted into the pencil insertion opening, and a lever end that is rotated toward the front of the case by the pressing of the contact part;
It has a resin spring part, and it is equipped with a vertically moving part that is pushed upward while elastically deforming this resin spring part with the loading of the waste case inside the case,
Moreover, the longitudinal movement parts are
A connection with the lever end of the lever part,
A protrusion that protrudes toward the front of the case and is located on the side of the edge facing the back of the case in the vertically moving part, or a recess that is recessed toward the back of the case,
It has a resin spring part that integrally joins this connection part and the formation part of the protrusion or recess,
In addition, the edge facing the back of the case in the vertically moving parts has a recess recessed toward the front of the case, or the side of the edge facing the front of the case adjacent to the recess in the vertically moving parts A protrusion that protrudes toward the back of the case is formed,
An electric pencil sharpener configured to allow the protrusion to enter the recess by pushing the vertically moving part upward when the waste case is loaded. The cutter holder is provided with a pin body that is gradually pressed toward the back of the case by being gradually narrowed by the cutting in the cutting space and is gradually advanced toward the back of the cutting space to protrude toward the back of the case. With
Inside the case of the electric pencil sharpener is equipped with driven parts that are pushed by the pin body protruding in this way and moved toward the back of the case,
Moreover, the electric pencil sharpener according to claim 1, wherein a hooking portion that is caught by the driven part is formed on the rear end side of the longitudinally moving part only when the driven part is moved to the case back side.

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