JPS6241120B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a lead gripping mechanism that is disposed inside a shaft cylinder and grips and feeds out a lead core through reciprocating motion, and a lead core gripping mechanism that is disposed in a position close to the lead core gripping mechanism. A sharpening pencil comprising a driving force transmitting means and an electric driving means disposed inside or outside the barrel and causing the lead gripping mechanism to slide with respect to the barrel via the driving force transmitting means. It is something.

Generally, a sharp pencil has a collection chuck, and by pressing with a fingertip the rear end of a lead storage case connected to the rear of the collection chuck, the collection chuck is moved back and forth, and the lead lead is sent out by the collection chuck. However, in recent years, as disclosed in Japanese Patent Application Laid-Open No. 53-21624, the lead core can be fed out by pressing the rear end of the lead core storage case with an electric drive means to feed out the lead core. Some proposals have also been made to try to eliminate the annoyance caused by this.

According to this proposal, when the user wants to feed out the lead lead as it wears out, the user can release the sharp pencil, press the rear end of the lead storage case with his or her fingertips, and grip the sharp pencil again. Although the trouble of having to repair it was eliminated, it also brought with it the following inconveniences.

That is, in order to send out the lead core, the drive means is energized to drive the drive means, and the lead core gripping mechanism is moved back and forth by the driving force, but while the drive means is energized, the lead core gripping mechanism is moved back and forth. The mechanism continues to feed out the lead core, and if the power is turned off once the lead core has been fed out, the lead gripping mechanism always stops with the lead core gripped, so the lead core is When you finish writing with the lead protruding from the tip of the sharp pencil, the protruding lead cannot be stored inside the sharp pencil, and therefore the lead may break when storing the sharp pencil. The lead wick may stain the storage area.

The present invention has been made in view of the above-mentioned conventional inconveniences, and includes a stop means for stopping a lead core gripping mechanism at a position (advanced position) where the lead core gripping mechanism releases its grip on the lead core; The present invention attempts to solve the inconveniences of the prior art by providing a retracting means for retracting the lead core from the position to the position where the lead core is gripped (retracted position).

The present invention will now be described in detail with reference to the accompanying drawings.

First, the embodiment shown in FIGS. 1 and 2 will be described. In FIG. 1, reference numeral 1 is a barrel, and the barrel 1 has a rear barrel 1d and a front part of the rear barrel. A connecting member 1c to be screwed together, an intermediate member 1b to be screwed to the connecting member 1c, and a front part of a lead gripping mechanism 2 disposed inside the barrel 1 so as to be slidable in the longitudinal direction of the barrel. The intermediate member 1 is loosely fitted and
The tip member 1a is screwed into an internal thread 4 that is engaged with a stepped portion 3 provided at the front end of the inside of the tip member 1b. A groove 5 is formed in the inner surface of the rear shaft cylinder 1d in the axial direction.
is provided, and a protrusion 7 provided integrally or as a separate member on the outer surface of the lead core storage chamber 6 at the rear of the lead core gripping mechanism 2 is slidably engaged in the groove 5. . Further, a battery 8, a motor 9 driven by the battery 8, and a speed reducer 10 connected to the motor 9 are sequentially arranged in the rear part of the rear shaft cylinder 1d. A threaded portion 12 is provided at the front of the shaft 11 of the speed reducer 10, and is slidably screwed into a threaded portion 13 provided at the rear of the lead core storage chamber 6. One end of a pneumatic strip 14 that is deformed by twisting or rotation of a spiral spring, a torsion spring, a balance spring, etc. is fixed to the shaft 11, and the other end of the pneumatic strip 14 is fixed to the inner surface of the rear shaft cylinder. It is worn. Inside the internal thread 4 is the lead core gripping mechanism 2.
A tightening ring 16 is loosely fitted to reduce the diameter of a lead gripping portion 15 provided at the front of the intermediate member 1b, and a switch device 18 for energizing the motor 9 is provided on the outer surface of the intermediate member 1b. Further, an annular protrusion 19 is provided on the inner surface of the connecting member 1c, and the annular protrusion 19 is positioned at the front end of the groove 5 to lock the protrusion 7.

Next, the operation of the embodiment shown in FIGS. 1 and 2 will be explained.

In the state shown in FIG. 1 (the position where the lead gripping mechanism 2 is retracted (the right side in the drawing is the rear and the left side is the front), the lead gripping part 15 is reduced in diameter by the tightening ring 16. When the switch device 18 is operated to energize the motor 9 (while holding the lead core), the motor 9 rotates, and its rotation is reduced by the speed reducer 10, causing the shaft 11 to rotate. As the shaft 11 rotates, it deforms the plucked strip 14 and advances the lead gripping mechanism 2 screwed onto the front part. This is because the lead gripping mechanism 2 is prevented from rotating by the engagement between the protrusion 7 and the groove 5, so it does not rotate together with the shaft 11, and therefore moves forward by the threaded portion with the shaft 11. This is because he is forced to do so. In the lead core gripping mechanism 2 that is advanced in this way, the tightening ring 16 stops its movement and the lead core gripping part 15 detaches from the tightening ring 16 and expands due to its own elasticity, and then the protrusion 7 When it comes into contact with the annular protrusion 19, the forward movement is stopped. (See FIG. 2) Therefore, even though the motor 9 is energized, its rotation is prevented. When the switch device 18 is operated again to stop the power supply to the motor 9, the plucked strip 14, which had been deformed by the shaft 11, will not return to its original state due to its own elasticity, and will move the shaft 11 in the opposite direction to the above-mentioned direction. Rotate it in the direction of. A shaft 11 formed by this plucked strip 14
The lead gripping mechanism 2 is retracted by the reverse rotation of
The diameter of the lead gripping portion 15 is reduced again by the tightening ring 16, thereby gripping the lead core and returning to the state shown in FIG. 1.

Next, other embodiments of the driving force transmitting means and stopping means of the present invention will be described with reference to FIGS. 3 to 7.

The embodiment shown in FIG. 3 is provided with a lock tooth 103 in place of the screw portion 13 provided in the lead core gripping mechanism 2 in FIGS. 1 and 2, which reduces the frictional resistance at the screwed portion. This is to minimize the number of holes and to make the rotation of the shaft 11 smoother. The other configurations and operations are the same as those of the embodiment shown in FIGS. 1 and 2, and will therefore be omitted.

The embodiment shown in FIG. 4 has a gear 112 attached to the front of the shaft 11, which engages
In addition, the drive transmission includes a gear 203 attached to a shaft 201 having an axis substantially perpendicular to the shaft 11 and rotatably attached to the rear shaft cylinder 1d, and a cam body 204 attached to the shaft 201. stop means consisting of a protrusion 205 provided on the inner surface of the rear shaft cylinder, and a spring 206 for resiliently repelling the lead gripping mechanism rearward. To explain its operation, as described above, when the motor 9 is driven and the shaft 11 is rotated, the gear 112, the gear 203 engaged therewith, and the shaft 2 are rotated.
01 is also rotated, and therefore the cam body 204 is also rotated. The cam body 204 rotated in this manner pushes the lead gripping mechanism 2 forward, but when the cam body 204 is rotated to the position shown by the dashed line in the figure,
The cam body 204 comes into contact with the protrusion 205 and is prevented from rotating. At the same time, the lead gripping mechanism 2 is stopped at the forward position and the lead core is released.
In order to return the lead core gripping mechanism 2 to the retracted position, the switch device 18 is operated to stop the energization of the motor 9. In order to return to the original state, the shaft 11 is rotated in the opposite direction, thus returning the cam body 204 to the position indicated by the solid line in the figure. When the cam body 204 is returned to its original position, the lead gripping mechanism 2 is moved backward by the elastic force of the spring 206 that is deformed when the lead gripping mechanism 2 moves forward, and the lead gripping part 15 is moved back. It can be stopped by grasping the lead core.

The reason for this configuration is to make the sliding movement between the drive transmission means and the lead gripping mechanism 2 smoother than in the embodiment shown in FIG.

The embodiment shown in FIG. 5 includes a rotating body 305 that is attached to a shaft 11 and has a protrusion 304 in the longitudinal direction of the shaft cylinder 1 at a position eccentric to the axis of the shaft 11, and the protrusion 304 is slidable. The lead gripping mechanism 2 is provided with a catch seat 306 that is in contact with the axial direction and is inclined with respect to the axial direction, and a protrusion 307 provided on the inner surface of the rear shaft cylinder.
and an axial groove 5 of the barrel 1 provided at the front of the rear barrel 1d, and a lead storage chamber at the rear of the lead gripping mechanism 2 that is slidably engaged with the groove 5 in the axial direction. 6, and a spring 308 for resiliently repelling the lead gripping mechanism 2 rearward, and the other configurations are the same as those of the embodiment shown in FIGS. 1 and 2. To explain this effect, when the switch device 18 is operated to drive the motor 9, the shaft 11 is rotated via the reducer 10,
As a result, the rotating body 30 is deformed while the plucked strips 14 are being deformed.
5 is rotated. When the rotating body 305 is rotated, the protrusion 304 slides on the seat 306 and moves the lead gripping mechanism 2 forward against the elastic force of the spring 308. The protrusion 304 moves the lead core gripping mechanism 2 forward, and when the lead core gripping mechanism 2 releases the lead, it comes into contact with the protrusion 307 on the inner surface of the rear shaft cylinder and its movement is stopped. If the switch device 18 is operated to stop the power supply to the motor 9 from this state, the protrusion 304 will return to its original position due to the restoring force of the plucked strip 14, and the lead gripping mechanism 2 will return to its original position due to the restoring force of the spring 308. The lead gripping mechanism 2 grips the lead core again.

In the embodiment shown in FIG. 6, a protrusion 207 attached to the rear end of the lead gripping mechanism 2 is provided in place of the protrusion 205 on the inner surface of the rear shaft cylinder that stops the cam body 204 in FIG. In the embodiment shown in FIG. 7, a protrusion 309 is provided at the rear end of the lead gripping mechanism 2 in place of the protrusion 307 on the inner surface of the rear shaft cylinder that stops the protrusion 304 in FIG. It is.

As described above, according to the present invention, which includes the stopping means for stopping the lead gripping mechanism at the forward position and the retracting means for retracting the lead gripping mechanism from the forward position to the retracted position, the operation of the switch device can be easily performed. Therefore, the lead core gripping mechanism can be reciprocated to feed out the lead core, and the lead core gripping mechanism can be moved forward and stopped to hold the lead core in a released state, so that the lead that can be ejected in this state is The lead can be stored in the barrel by pressing the tip of the lead, so even if you put the sharp pencil in your pocket, pencil case, etc. after writing, the protruding lead will not stain your pocket, pencil case, etc. There is no risk of breakage of the protruding lead core.

In the above description, the switch device 18 has been described as having a configuration for energizing and de-energizing the motor 9, but a two-pole, double-throw switch device 51 with neutral is used to rotate the motor 9 forward, reverse, and stop.
8 (see FIG. 8), the above-mentioned reel 14 may be omitted. Further, in the stopping means, a locking body 401 is provided on the shaft 11, and the locking body 401 comes into contact with a protrusion 405 provided on the inner surface of the shaft cylinder when the lead core gripping mechanism moves forward and releases the lead core. It may be done by (See FIG. 9) Further, a driving means 402 is arranged outside the shaft cylinder, and the driving means 402 and the drive transmission means 403 inside the shaft cylinder 1 are connected by a driving force conductor 404 having the shaft 11 inside. It's okay. (See Figure 9)

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a state in which the lead gripping mechanism in FIG. 1 moves forward and stops, and FIGS. FIG. 8, which is a diagram showing another embodiment, is a diagram showing a double pole double throw switch device with neutral. DESCRIPTION OF SYMBOLS 1... Shaft cylinder, 2... Lead core gripping mechanism, 5... Groove, 7... Projection, 8... Battery, 9... Motor, 12... Screw part,
13... Threaded portion, 14... Repellent strip, 19... Annular protrusion, 1
03...Rack tooth, 201...Shaft, 203...Gear, 2
04...Cam body, 205...Protrusion part, 304...Protrusion part, 305...Rotating body, 306...Socket, 307...Protrusion part, 405...Protrusion part.

Claims (1)

[Scope of Claims] 1. A lead gripping mechanism that is disposed inside the shaft cylinder and grips and feeds out the lead core through reciprocating motion, and a driving force transmission means that is disposed close to the lead core gripping mechanism; In the sharpening pencil, the lead gripping mechanism includes an electric drive means disposed inside or outside the barrel and causing the lead gripping mechanism to slide forward with respect to the barrel via the driving force transmission means. A sharpening pencil comprising: a stopping means for stopping the lead lead gripping mechanism at a forward position where the grip on the lead lead is released; and a retracting means for retracting the lead lead gripping mechanism from this position to a retracted position where the lead lead gripping mechanism is gripped. 2. The sharp as set forth in claim 1, wherein the driving force transmission means is formed by screwing together a screw portion attached to the drive means and a screw portion attached to the lead core gripping mechanism. pencil. 3. The driving force transmission means according to claim 1, wherein the driving force transmission means is formed by engagement between a worm gear attached to the driving means and a rack tooth attached to the lead core gripping mechanism. Sharpening pencil. 4. The driving force transmitting means is attached to a gear attached to the driving means, a gear that engages with the gear and has an axis substantially perpendicular to the axis of the gear, and the shaft of the gear, and is attached to the shaft of the gear, and The sharpening pencil according to claim 1, characterized in that it comprises a cam body that comes into contact with a mechanism. 5. The driving force transmitting means is fixed to a rotating body that is attached to the driving means and has a protrusion in the longitudinal direction of the shaft cylinder at a position eccentric to the axis of the driving means, and the lead gripping mechanism. 2. The sharpening pencil according to claim 1, further comprising a seat whose end surface is inclined with respect to the longitudinal direction of the barrel, and the seat and the protrusion are in contact with each other. 6. The sharpener according to claim 1, wherein the stopping means is formed by contact between a protrusion provided on the lead gripping mechanism and an annular protrusion provided on the inner surface of the shaft cylinder. pencil. 7. The sharp pencil according to claim 1, wherein the stopping means is formed by contact between a locking body provided on the shaft and a protrusion provided on the inner surface of the shaft cylinder. 8. The sharp pencil according to claim 1, wherein the stopping means is formed by contact between the driving force transmitting means and a protrusion provided on the inner surface of the barrel. 9. The sharp pencil according to claim 1, wherein the stopping means is formed by contact between the driving force transmitting means and a protrusion provided at the rear of the lead gripping mechanism. 10. The sharp pencil according to claim 1, wherein the retracting means comprises a switch device for reversely operating the drive means. 11. The sharp pencil according to claim 1, wherein the retracting means comprises a plectrum for causing the driving means to rotate in the opposite direction.