JP2001121881A - Motorized writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems in the conventional technology that a reducing gear is required to have a strength sufficiently durable to the writing load as the load is applied to the reducing gear, the technical difficulties of making a writing implement smaller and providing the sufficient strength at the same time are not solved and also the reduction of the cost is difficult. SOLUTION: A motorized writing implement is provided with a writing body, a motor and a forward and backward moving mechanism in a barrel, and the motor is driven by operating an operation section provided in the barrel to appear and disappear the writing body, and a supporting section is provided in the barrel and also a contact section is provided on the forward and backward moving mechanism connected with the motor, and the contact section is brought into rotative contact with the supporting section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric writing instrument in which a writing body is moved in and out by an electric motor and a forward / backward movement mechanism, and more particularly to a structure for limiting a thrust load on a drive shaft of the electric motor.

[0002]

2. Description of the Related Art Conventionally, as a writing instrument of this kind, Japanese Utility Model Publication No. 4
Japanese Patent Publication No. 1-1767 is known. The publication discloses, as an example, a structure in which the driving force of a small motor is increased by a reduction mechanism by a reduction gear, and the rotation of the small motor is converted into front-rear operation by a male screw member and a female screw member, and the writing body is moved in and out. Have been.

[0003]

In the above-mentioned prior art, when a writing load is applied, the load is applied to the reduction gear, and the writing load is not applied to the drive shaft of the small motor. Therefore, the reduction gear needs to have strength enough to withstand the writing load. However, the speed reduction device housed in the main body of the writing instrument needs to have a practically small shape, and it is technically difficult to provide both a reduction in size and strength. Further, there is a problem that it is difficult to reduce the price due to the complicated structure. It is also possible to convert the rotation of the small motor into a back and forth operation without using the reduction gear and make the writing body appear and disappear, but in this case, the writing load is applied to the drive shaft of the small motor and the small motor There was a problem that would be damaged.

[0004]

According to the present invention, there is provided a writing cylinder, an electric motor, and a forward / backward movement mechanism in a shaft cylinder, and the electric motor is driven by operating an operation unit provided in the shaft cylinder. Then, in the electric writing instrument for allowing the writing body to protrude and retract from the barrel, a support portion is provided in the barrel, and a contact portion is provided in a forward / backward mechanism connected to the electric motor, and the contact portion is rotatable. The gist of the present invention is to contact the support portion.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. 1 to 4
Is a first embodiment of the present invention. A tip metal 2 is detachably attached to the front of the barrel 1 by screwing or the like (hereinafter, the upper side in the figure is referred to as rear, and the lower side is referred to as front). On the other hand, a tail crown 3 is detachably attached to the rear of the barrel 1 by screwing or the like. The barrel 1 includes a small-diameter portion 1a and a large-diameter portion 1b. Inside the large-diameter portion 1b, a front fixing member 4 and a rear fixing member 5 are fixed by press-fitting or the like. Small D via spacer 7
The C motor 8 and the control circuit 9 are fixed. Also,
The small DC motor 8 is electrically connected to the control circuit 9. The small DC motor 8 has a rotating shaft 8a, and a rotating screw rod 10 as a bolt member is attached to the rotating shaft 8a by a method such as press fitting. Further, a sliding screw cylinder 11 which is a nut member is arranged in a screwed state with the rotating screw rod 10. The cross-sectional outer shape of the sliding screw cylinder 11 is formed by connecting two opposing flat surfaces by an arc, and the rotation preventing member 12 fixed to the small-diameter portion 1a of the shaft cylinder 1 by press fitting or the like. Therefore, the sliding screw cylinder 11 is prevented from rotating because it penetrates through a small gap. Thus, the rotation of the rotary screw rod 10 allows the sliding screw cylinder 11 to move forward or backward. A ballpoint pen refill 13 that is a writing body is disposed in front of the sliding screw cylinder 11 by a method such as press fitting.
As a result, the forward or backward movement of the sliding screw cylinder 11 becomes the forward or backward movement of the ballpoint pen refill 13. The front fixing member 4 has a support portion 4a, and the rotary screw bar 10 has a contact portion 10a at a rear end. The contact portion 10a is rotatably contacted with the support portion 4a.

A switch 14 for driving the small DC motor 8 is disposed on a side surface of the small diameter portion 1a of the barrel 1 via a switch base 15 and a switch fixing portion 16. The switch 14 has a projection 14a, and a contact fitting 17 is arranged on the surface of the projection 14a by a method such as press fitting. The switch 14 is made of an elastic material such as silicone rubber or elastomer.
It can be elastically deformed by pressing in the axial direction.
On the other hand, contact fittings 18 and 19 are arranged on the switch base 15, and when the switch 14 is pressed, the contact fitting 17 bridges the contact fittings 18 and 19 and becomes energized. Further, the contact fittings 18 and 19 are electrically connected to the control circuit 9 via cords 20 and 21 wired in the shaft cylinder 1, respectively. The switch 1
4 may be formed of conductive rubber, and in that case, the contact fitting 17 may be omitted. When a non-conductive rubber is used, a conductive paint or the like may be baked or printed on the surface of the protrusion 14a.

[0007] A battery 22 is disposed on the rear fixing member 5. Behind this, a pressing spring 23 for pressing the battery 22 is arranged. The holding spring 23 has a base portion 23a, and is penetrated and fixed to a support plate 24 fixed to the tail crown 3 by a method such as press fitting.
Further, a circumferential connection fitting 25 is disposed on a peripheral portion 24a provided on the support plate 24, and the connection fitting 25 is fixed to the support plate 24 through its base 25a. The base 23a and the base 25a are electrically connected by a cord 26. A connection fitting 27 is arranged on the rear fixing member 5. The connection fitting 27 has a U-shape, and an intermediate portion of the U-shape is fitted and fixed in a groove 5 a provided on a side surface of the rear fixing member 5.
One end of the U-shape is bent and arranged behind the rear fixing member 5 so as to be able to come into contact with the connection fitting 25. The U-shaped other end of the connection fitting 27 is bent and disposed in front of the rear fixing member 5 and is electrically connected to the control circuit 9. A connection fitting 28 is disposed in front of the battery 22. The connection fitting 28 is penetrated and fixed to the rear fixing member 5, and an end thereof is electrically connected to the control circuit 9.

Behind the switch base 15, a sensor switch 2 for detecting the projected position of the ballpoint pen refill 13 is provided.
9 is fixedly arranged. Further, a sensor switch 30 for detecting the storage position of the ballpoint pen refill 13 is fixedly disposed in front of the front fixing member 4. These sensor switches 29, 30 are provided with cords or metal fittings 31, 32.
Are electrically connected to the control circuit 9. The sensor switches 29 and 30 are connected to the button units 29a and 30
When the button portions 29a and 30a are pressed, electrical energization and disconnection can be performed.

Next, the method of use (operation) of the first embodiment will be described. When the switch 14 is pressed in the ball-point pen refill storage state shown in FIG. 1, the contact fitting 17 bridges the contact fittings 18 and 19 to energize the control circuit 9.
As a result, the rotation shaft 8a of the small DC motor 8 starts rotating. Accordingly, the rotating screw rod 10 rotates, and the sliding screw cylinder 11 moves forward by the above-described component configuration. Thereby, the ballpoint pen refill 13 moves forward. Then, when the sliding screw cylinder 11 is further advanced and the button portion 29a of the sensor switch 29 is pushed in, the control circuit 9 detects it and stops the rotation of the small DC motor 8. Note that this position is the writing position of the ballpoint pen refill 13. In performing writing, the writing load of the ballpoint pen refill 13 is applied to the support portion 4a of the front fixing member 4 from the sliding screw cylinder 11 through the contact portion 10a of the rotary screw rod 10, but the front fixing member 4 Since the member 4 is fixed to the barrel 1, the thrust load on the rotating shaft 8a of the small DC motor 8 is limited, and damage to the small DC motor 8 can be prevented.

When the writing is completed and stored, when the switch 14 is depressed in FIG. 4, the contact fitting 17 bridges the contact fittings 18 and 19, and the control circuit 9 is energized.
Accordingly, the rotating shaft 8a of the small DC motor 8 starts rotating in the opposite direction. Accordingly, the rotary screw rod 10 rotates, and the sliding screw cylinder 11 retreats due to the above-described component configuration. As a result, the ballpoint pen refill 13 is retracted. The sliding screw cylinder 11 is connected to the sensor switch 3.
The control circuit 9 detects when the 0 button section 30a is pressed, and stops the rotation of the small DC motor 8.
This position is the storage completion position.

FIG. 5 shows a modification of the first embodiment of the present invention. The description of the same parts as those in the above-described embodiment will be omitted. A rotary screw rod 10 is fitted into the rotary shaft 8a of the small DC motor 8 so as to be non-rotatable and slidable.
The rotary screw bar 10 has a collar portion 10b at the rear end. The front fixing member 4 has support portions 4a and 4b, and the collar portion 10b is located between the support portions 4a and 4b, and is disposed with a slight clearance. Sliding screw cylinder 11
However, the configuration of the part which is advanced and retracted by the rotary screw rod 10 is the same as that of the above-described embodiment.

Next, a method of use (operation) of the present modified example will be described. When the switch 14 is pressed, the control circuit 9 causes the rotation shaft 8a of the small DC motor 8 to start rotating. As described above, the rotary screw rod 10 is fitted so as to be non-rotatable and slidable with respect to the rotary shaft 8a, and is not press-fitted and fixed, but the collar portion 10b is fixed by the support portions 4a and 4b. Because movement back and forth is restricted,
The rotating screw rod 10 starts rotating. Then, similarly to the above-described embodiment, the sliding screw cylinder 11 moves forward and stops at the writing position. When performing writing, ballpoint pen refill 1
The writing load of No. 3 is transmitted to the collar 10b via the sliding screw cylinder 11 and the rotary screw rod 10, but the collar 1
The contact portion 10a of Ob contacts the support portion 4a, and the support portion 4a receives a writing load. For this reason, the thrust load on the rotating shaft 8a of the small DC motor 8 is limited,
This can prevent the C motor 8 from being damaged. The support portion 4b is provided to prevent the rotary screw rod 10 from falling off.

When the writing is completed and stored, the rotary shaft 8a of the small DC motor 8 is rotated in the opposite direction by pressing the switch 14, and stored, as in the above-described embodiment. According to this modification, the rotating shaft 8a and the rotating screw rod 1
0 is slidable, so that the positioning of the small DC motor 8 and the rotary screw rod 10 can be determined by the shape of the fixing member 4, so that attention in the assembling process can be reduced, and assemblability can be reduced. There is a merit that it can be improved.

FIGS. 6 and 7 show a second embodiment. The description of the same parts as those in the above-described embodiment will be omitted. A fixing member 33 is fixed to the inside of the large-diameter portion 1b of the barrel 1 by a method such as press fitting, and the small DC motor 8 is fixed to the fixing member 33 by a method such as press fitting. A worm gear 34 is fitted so as to be non-rotatable and slidable with respect to the rotation shaft 8a of the small DC motor 8. The fixing member 33 has a pressing portion 33a at the front, and the worm gear 34 is rotatably abutted on the supporting portion 33b of the pressing portion 33a at the front and rotatably at the supporting portion 33c of the fixing member 33 at the rear. Support portion 33b,
The gap is set so as to maintain a slight clearance between 33c. A worm wheel 35 is disposed beside the worm gear 34, and a rack member 36 is disposed beside the worm wheel 35. The worm wheel 35 has a rotating shaft 35a attached to the fixing member 33 so as to be rotatable. The rack member 36 has a projection 36a.
And is slidable. The rack member 36 has a holding portion 36b extending forward, and the ball-point pen refill 13 is press-fitted into the holding portion 36b. Thereby, the rack member 36
Of the ball-point pen refill 13 is advanced or retracted. The sensor switch 29 is disposed in front of the holding portion 36b, and the sensor switch 30 is disposed behind the rack member 36.

Next, the method of use (operation) of the second embodiment will be described. When the switch 14 is pressed in the ballpoint pen refill storage state shown in FIG.
The rotation shaft 8a of the small DC motor 8 starts rotating. Accordingly, the worm gear 34 rotates, and the worm wheel 35 rotates at a reduced speed. Then, the rack member 36 moves forward. Thereby, the ball-point pen refill 13 moves forward together with the holding portion 36b. Then, when the holding portion 36b further moves forward and pushes the button portion 29a of the sensor switch 29, the control circuit 9 detects it and stops the rotation of the small DC motor 8. Note that this position is the writing position of the ballpoint pen refill 13. When writing, the writing load of the ballpoint pen refill 13 is transmitted to the worm gear 34 via the holding portion 36b, the rack member 36, and the worm wheel 35,
The worm gear 34 is a rotating shaft 8 of the small DC motor 8.
The worm gear 34 comes into contact with the support portion 33b by the transmitted force because the worm gear 34 is slidably attached to the support portion 33b. Therefore, the support portion 33b receives the writing load. Therefore, the thrust load on the rotating shaft 8a of the small DC motor 8 is limited, and the damage of the small DC motor 8 can be prevented.

When the writing is completed and stored, when the switch 14 is pressed in FIG. 7, the control circuit 9 starts the rotation of the rotating shaft 8a of the small DC motor 8 in the reverse direction. Accordingly, the worm gear 34 and the worm wheel 35 rotate in the reverse direction, and the rack member 36 retreats.
As a result, the ballpoint pen refill 13 is retracted. The rear end of the rack member 36 is connected to the sensor switch 3.
When the 0 button portion 30a is pressed, the control circuit 9 detects the depression and stops the rotation of the small DC motor 8. still,
This position is the storage completion position. According to the present embodiment, a worm gear can be used as a speed reduction mechanism, and the output can be increased and transmitted, so that a smaller motor can be used as compared with the above embodiment.

[0017]

According to the present invention, a writing body, an electric motor, and a forward / backward movement mechanism are provided in a shaft cylinder, and the electric motor is driven by operating an operation unit provided in the shaft cylinder to write the character. In an electric writing instrument that allows a body to protrude and retract from a barrel, a support portion is provided in the barrel, and a contact portion is provided in a forward / backward mechanism connected to the electric motor, and the contact portion is rotatably attached to the support portion. The small motor will not be damaged when a writing load is applied, and there is no need to provide the reduction gear with excessive strength, simplifying the structure and reducing the price of the product. It has the advantage of being possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is an end view taken along line AA of FIG. 1;

FIG. 3 is a front view of the switch base 15;

FIG. 4 is a longitudinal sectional view when the cursive is advanced.

FIG. 5 is a longitudinal sectional view showing a modification of the first embodiment.

FIG. 6 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view when the cursive is advanced.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Small diameter part 1b Large diameter part 2 Down payment 3 Tail cap 4 Front fixing member 4a Support part 4b Support part 5 Rear fixing member 5a Groove part 6 Partition plate 7 Spacer 8 Small DC motor 8a Rotating shaft 9 Control circuit 10 Rotation Screw rod 10a Contact part 10b Collar part 11 Sliding screw cylinder 12 Rotation preventing member 13 Ballpoint pen refill 14 Switch 14a Projection part 15 Switch base 16 Switch fixing part 17 Contact fitting 18 Contact fitting 19 Contact fitting 20 Code 21 Code 22 Battery 23 Holding spring 23a Base 24 Support plate 24a Circumference 25 Connection fitting 25a Base 26 Cord 27 Connection fitting 28 Connection fitting 29 Sensor switch 29a Button section 30 Sensor switch 30a Button section 31 Cord or fitting 32 Cord or fitting 33 Fixing member 33a Hold down 33b supporting portion 33c supporting portions 33d sliding groove 34 worm gear 35 worm wheel 35a rotates shaft 36 the rack member 36a protrusion 36b holding portion

Claims (1)

[Claims] A writing body, an electric motor, and a forward / backward movement mechanism are provided in a barrel, and an electric motor is driven by operating an operation unit disposed on the barrel to move the writing body from the barrel. In the electric writing instrument to be retracted, a support portion is provided in the shaft cylinder, and a contact portion is provided in a forward / backward movement mechanism connected to the electric motor, and the contact portion is rotatably contacted with the support portion. An electric writing instrument characterized by the following.