JPH08238888A - Motor-operated lead feeding type mechanical pencil - Google Patents

Abstract

PURPOSE: To simply operate to feed a lead or to discharge consumed lead by next lead by detachably mounting a rear shaft covering a pin at the rear of a barrel, and incorporating a battery for driving a solenoid in the rear shaft. CONSTITUTION: When a drive button 20 is pressed by a small force of the degree for bringing a finger into contact, a drive switch 1 is operated. A display lamp 2 is lit, ON and OFF are repeated many times (about five times) by an IC circuit 3, and a solenoid 4 is magnetized many times. Then, each time the solenoid 4 is magnetized, a magnetic element 15 is pulled to the solenoid 4, a chuck 6 is advanced, and each time the chuck 6 is advanced, a predetermined amount of the lead 5 is fed. Accordingly, since the chuck 6 is advanced many times without pressing the switch 1 many times, the operation becomes very simple. In the state that the button 20 continuously presses, the circuit 3 is repeated ON, OFF predetermined times, and then stopped in the ON state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric lead-feeding mechanical pencil in which a chuck is moved forward by magnetizing a solenoid to feed a lead, and also a lead is manually fed.

[0002]

2. Description of the Related Art Conventionally, various electric lead-feeding type mechanical pencils for feeding a lead by magnetizing a solenoid have been known.

[0003]

However, none of the conventional electric lead-feeding mechanical pencils can feed the lead when the battery is exhausted. An object of the present invention is to provide an electric lead-feeding type mechanical pencil that solves the above problems.

[0004]

In order to achieve the above object, the present invention provides a shaft cylinder, a drive switch provided in a grip portion of the shaft cylinder, and a longitudinally slidable built-in member in the shaft cylinder. And a spring for urging the chuck backward in the longitudinal direction. When the drive switch is operated, the solenoid is magnetized, and the chuck is advanced to move the lead out. A core tank is fixed to the rear part of this chuck, and a plug for closing the core insertion port is detachably provided at the rear part of the core tank. The gist is that a battery for driving the solenoid is built in the rear shaft so that it is detachably attached to the rear part.

Therefore, when the battery is exhausted, the rear shaft is removed to expose the plug, and by pressing the plug, the chuck is advanced to allow the lead to be drawn out.

[0006]

Embodiments of the present invention will be described with reference to FIGS. 1, 2 and 3. Although the mounting structure of the drive switch 1, the display lamp 2, the IC circuit 3, and the solenoid 4 is omitted in the drawing, a conventional mounting structure known in the art may be used for them. A tightening ring 7 is externally fitted to the head 6A of the chuck 6 that holds the lead 5, and a lead tank 8 is fixed to the rear portion of the chuck 6. A lead insertion port 8A is formed at the rear end of the lead tank 8, and a plurality of lead 5 are housed in the lead tank 8. A cup-shaped plug 9 is detachably fitted to the rear portion of the lead tank 8 to close the lead insertion port 8A of the lead tank 8. Between the connector 10 with which the rear end of the tightening ring 7 abuts and the outer stage 8B of the lead tank 8, a load during installation is 100 g to
A weak spring 11 of about 200 g is stretched, and the head 6A of the chuck 6 is normally in contact with the tightening ring 7. The chuck 6 and the lead tank 8 are slidable in the longitudinal direction, and the shaft cylinder 1
A connector 1 built in 2 and inserted from the rear of the barrel 12.
The base 13 is screwed to 0. A core holder 14 that holds the core 5 with an appropriate force is built in the base 13. The stopper 9
Is properly exposed from the rear end of the barrel 12. A drive switch 1 is provided on the grip portion 12A of the shaft cylinder 12, and a display lamp 2 that is turned on when the drive switch 1 is operated is provided on the shaft cylinder 12. An IC circuit 3 is provided on the inner surface of the shaft cylinder 12 for providing a repeat function of repeating ON and OFF a plurality of times when the drive switch 1 is operated,
Further, the solenoid 4 is provided on the inner surface of the barrel 12. A ring-shaped magnetic body 15 is provided on the outer peripheral surface of the wick tank 8, and the magnetic body 15 is appropriately separated from the rear of the solenoid 4. Further, a ring-shaped contact point A and a ring-shaped contact point B are provided on the inner side of the rear portion of the shaft tube 12 while being appropriately separated. A rear shaft 16 is screwed into the rear portion of the shaft cylinder 12, and the plug 9
Protect. A ring-shaped contact C and a ring-shaped contact D are provided on the front portion of the rear shaft 16, and the contact C contacts the contact A and the contact D contacts the contact B. Further, a battery 17 is built in the rear shaft 16, and the power source of the battery 17 is turned on.
A power switch 19 for turning off is provided. A lid 18 is screwed onto the rear shaft 16 to fix the battery 17, and the contact F provided on the lid 18 is connected to the positive electrode 1 of the battery 17.
Contact 7A. As the power switch 19, various conventionally known switches can be used. For example, by pressing an OFF button 19A of a plate-shaped power switch 19 protruding from the peripheral surface of the rear shaft 16, the power switch 19 slides. Then, the contact E separates from the negative electrode 17B of the battery 17,
When the power switch 19 is turned off, the ON button 19B projects from the peripheral surface of the rear shaft 16. Next, when the ON button 19B is pressed, the contact E comes into contact with the negative electrode 17B of the battery 17 through the hole 19C of the power switch 19, and the power switch 1
When 9 is inserted, the OFF button 19A projects from the peripheral surface of the rear shaft 16. Moreover, the contact E is connected to the contact C and the contact F is connected to the contact D, respectively.

Next, the operation of feeding the lead 5 will be described. FIG.
In this state, when the drive button 20 is pressed with a slight force such that it is touched with a finger, the drive switch 1 is activated.
Then, the display lamp 2 is turned on, and the IC circuit 3 repeatedly turns on and off a plurality of times (about 5 times) to magnetize the solenoid 4 a plurality of times. Then, every time the solenoid 4 is magnetized, the magnetic body 15 is pulled by the solenoid 4,
The chuck 6 advances. Each time the chuck 6 advances, a certain amount of the core 5 is fed. Therefore, since the chuck 6 advances a plurality of times without repeatedly pressing the drive switch 1,
It is very easy to operate. Further, when the drive button 20 is continuously pressed, the IC circuit 3 turns on and off a specified number of times.
After repeating, stop in the ON state. That is, the chuck 6 is stopped in the expanded state, and the state shown in FIG. 2 is obtained. Therefore, if the lead 5 is too far out, the lead 5 can be retracted by pushing it in. When the drive button 20 is released, the drive switch 1 is turned off, and the chuck 6 is retracted by being biased by the spring 11 and returns to the state of FIG. When writing is done for a long time and the battery 17 is exhausted, the lid 18 is removed and a new battery 1
Put on 7 and use. However, when there is no spare battery 17, by removing the rear shaft 16, the stopper 9 is pressed in the same manner as the conventional manual knock type mechanical pencil, and the core 5 is removed.
You can also pay out. When you finish using the electric lead-out mechanical pencil and carry it with you, turn on the power switch 19
Turn off. In this state, even if the drive switch 1 is pressed, there is no possibility that the lead 5 will be drawn out.

FIG. 4 is a wiring diagram of the above embodiment, in which the positive electrode 17A of the battery 17, the contact F, the contact D,
Contact B, drive switch 1, indicator lamp 2, IC circuit 3,
The solenoid 4, the contact A, the contact C, the contact E, the power switch 19, and the negative electrode 17B of the battery 17 are wired in this order. However, the wiring order is not limited to the above embodiment, and can be set arbitrarily.

FIG. 5 shows another embodiment of the present invention, which is a plug 10 for closing the lead insertion port 108A of the lead tank 108.
9 is composed of an eraser.

[0010]

As described above, according to the present invention, the chuck can be advanced and the lead can be drawn out by pressing the drive switch with a slight force such that the chuck comes into contact with the chuck. Therefore, the operation of feeding the lead or discharging the consumed lead by the next lead becomes very simple. Moreover, if the battery is exhausted,
The core can be extended even by hand, which is extremely practical.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an electric lead feeding type mechanical pencil of the present invention.

FIG. 2 is a cross-sectional view showing a state where a drive switch is operated.

FIG. 3 is a partial cross-sectional view showing a state in which a lead can be paid out manually.

FIG. 4 is a wiring diagram of the electric lead-feeding type mechanical pencil of the present invention.

FIG. 5 is a partial sectional view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 1 Drive Switch 4 Solenoid 5 Core 6 Chuck 8 Core Tank 8A Core Tank 8 Core Insertion Port 9 Plug 11 Spring 12 Shaft Cylinder 16 Rear Shaft 17 Battery 108 Core Tank 108A Core Tank 108 Core Insertion Port 109 Plug

Claims (1)

[Claims] 1. A shaft cylinder, a drive switch provided in a grip portion of the shaft cylinder, a chuck built in the shaft cylinder so as to be slidable in the longitudinal direction, and a spring for biasing the chuck rearward in the longitudinal direction. When the drive switch is operated, the solenoid is magnetized and the chuck advances and the lead is drawn out. A closing plug is provided detachably, the plug appropriately protrudes from the rear end of the barrel, and a rear shaft covering the plug is detachably attached to the rear part of the barrel, and a battery for driving a solenoid is built in the rear shaft. An electric lead feeding type mechanical pencil that is characterized.