JP3737836B2 - Electric lead feeding type mechanical pencil - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an electric lead feeding type mechanical pencil capable of feeding a lead by moving a chuck forward by magnetizing a solenoid and also feeding a lead manually.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various electric lead feeding type mechanical pencils that feed a lead by magnetizing a solenoid are known.
[0003]
[Problems to be solved by the invention]
However, none of the conventional electric lead feeding type 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-described problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a shaft tube, a drive switch provided in a grip portion of the shaft tube, a chuck built in the shaft tube so as to be slidable in the longitudinal direction, and the chuck in the longitudinal direction rearward. The solenoid is magnetized by operating the drive switch to advance the chuck and advance the lead. A core tank is fixed to the rear part of the chuck, and a plug for closing the core insertion port is detachably provided at the rear part of the core tank. The plug protrudes appropriately from the rear end of the shaft cylinder, and the rear shaft covering the plug is connected to the shaft cylinder. The gist is that a battery for detachably attaching to the rear part and driving a solenoid is incorporated in the rear shaft.
[0005]
Therefore, when the battery is exhausted, the rear shaft is removed to expose the plug, and by pressing the plug, the chuck is advanced and the lead can be fed out.
[0006]
【Example】
An embodiment of the present invention will be described with reference to FIGS. In the drawing, the mounting structure of the drive switch 1, the display lamp 2, the IC circuit 3, and the solenoid 4 is omitted, but these may be a conventionally known normal mounting structure. A tightening ring 7 is fitted on the head 6A of the chuck 6 that holds the lead 5, and a lead tank 8 is fixed to the rear part of the chuck 6. A lead insertion port 8 </ b> A is formed at the rear end of the lead tank 8, and a plurality of leads 5 are accommodated in the lead tank 8. A cup-shaped stopper 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. A weak spring 11 having a load of about 100 g to 200 g is stretched between the connector 10 with which the rear end of the tightening ring 7 abuts and the outer stage 8B of the core tank 8. 6A is in contact with the tightening ring 7. The chuck 6 and the core tank 8 are built in the shaft cylinder 12 so as to be slidable in the longitudinal direction, and the base 13 is screwed into the connector 10 inserted from the rear of the shaft cylinder 12. A core holder 14 for holding the core 5 with an appropriate force is built in the base 13. The plug 9 is appropriately exposed from the rear end of the shaft cylinder 12. A drive switch 1 is provided in the grip portion 12A of the shaft tube 12, and a display lamp 2 that is lit when the drive switch 1 is operated is provided in the shaft tube 12. An IC circuit 3 is provided on the inner surface of the shaft tube 12 to provide a repeat function that repeats ON and OFF a plurality of times when the drive switch 1 is operated, and a solenoid 4 is provided on the inner surface of the shaft tube 12. It is done. A ring-shaped magnetic body 15 is provided on the outer peripheral surface of the core tank 8, and the magnetic body 15 is configured to be appropriately separated behind the solenoid 4. Further, a ring-shaped contact A and a ring-shaped contact B are provided on the inner side of the rear portion of the shaft cylinder 12 so as to be appropriately separated. A rear shaft 16 is screwed to the rear portion of the shaft cylinder 12 to protect the stopper 9. A ring-shaped contact C and a ring-shaped contact D are provided at the front portion of the rear shaft 16. 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 a power switch 19 for turning the battery 17 on and off is provided. A lid 18 is screwed onto the rear shaft 16 to fix the battery 17, and a contact F provided on the lid 18 contacts the positive electrode 17 </ b> A of the battery 17. As the power switch 19, various known switches can be used. For example, the power switch 19 slides by pressing an OFF button 19A of a plate-shaped power switch 19 protruding from the peripheral surface of the rear shaft 16. Then, the contact E is separated from the negative electrode 17B of the battery 17, the power switch 19 is turned off, and the ON button 19B protrudes 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 19 is turned on and the OFF button 19A protrudes from the peripheral surface of the rear shaft 16. In addition, the contact E is connected to the contact C, and the contact F is connected to the contact D.
[0007]
Next, an operation for extending the lead 5 will be described. In the state of FIG. 1, when the drive button 20 is pressed with a slight force enough to contact with a finger, the drive switch 1 is activated. Then, the display lamp 2 is turned on, and the IC circuit 3 is repeatedly turned ON and OFF a plurality of times (about 5 times), and the solenoid 4 is magnetized a plurality of times. Then, every time the solenoid 4 is magnetized, the magnetic body 15 is pulled by the solenoid 4 and the chuck 6 moves forward. Each time the chuck 6 moves forward, the fixed amount core 5 is fed out. Therefore, since the chuck 6 moves forward a plurality of times without pressing the drive switch 1 many times, the operation becomes very simple. In the state where the drive button 20 is continuously pressed, the IC circuit 3 is repeatedly turned ON and OFF a predetermined number of times and then stopped in the ON state. That is, the chuck 6 stops in the expanded state, and becomes the state of FIG. Therefore, when the lead 5 is excessively protruded, 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 is biased by the spring 11 so that the chuck 6 moves backward and returns to the state shown in FIG. When writing is performed for a long time and the battery 17 is exhausted, the cover 18 is removed and a new battery 17 is mounted and used. However, when there is no spare battery 17, by removing the rear shaft 16, the plug 9 can be pressed and the core 5 can be fed out in the same manner as a conventional manual knock mechanical pencil. When the use of the electric lead feeding type mechanical pencil is finished and carried, the power switch 19 is turned off. In this state, even if the drive switch 1 is pressed, the lead 5 is not likely to be drawn out.
[0008]
FIG. 4 shows a wiring diagram of the above embodiment. The positive electrode 17A, the contact F, the contact D, the contact B, the drive switch 1, the display lamp 2, the IC circuit 3, the solenoid 4 and the contact A of the battery 17 are shown. , Contact C, contact E, power switch 19, and 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 arbitrarily set.
[0009]
FIG. 5 shows another embodiment of the present invention, in which a stopper 109 for closing the core insertion port 108A of the core tank 108 is made of an eraser.
[0010]
【The invention's effect】
In the present invention described above , the drive switch is activated only by pressing the drive button to the extent that it is touched once with a finger. Then, ON and OFF are repeated a plurality of times by the IC circuit, and the solenoid is magnetized a plurality of times. Therefore, since the chuck moves forward a plurality of times without pressing the drive switch many times, the operation of paying out the lead or discharging the worn lead with the next lead becomes very simple.
[Brief description of the 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 where the lead can be manually extended.
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]
DESCRIPTION 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)

A shaft switch, a drive switch provided in a gripping portion of the shaft tube, which is normally in an OFF state, and is turned ON only when the drive button is pressed with a finger; and a chuck built in the shaft tube so as to be slidable in the longitudinal direction The spring comprises a spring for urging the chuck rearward in the longitudinal direction , a solenoid provided in the shaft cylinder, and a magnetic body provided in the core tank. The solenoid is magnetized by operating the drive switch, and this magnetized In an electric lead feeding type mechanical pencil that uses a force that pulls the magnetic body by the solenoid to advance the chuck and feeds the lead, a lead tank is fixed to the rear part of the chuck and a plug for closing the lead insertion port is provided at the rear part of the lead tank. The plug protrudes from the rear end of the shaft tube as appropriate, and the rear shaft that covers the plug is removably attached to the rear portion of the shaft tube, and the solenoid is driven into the rear shaft. A built-in battery, further, a plurality of times ON when actuating the driving switch, repeatedly OFF, specified number ON in the state continued to press the driving button, the IC circuit that stops in the state of ON after repeated OFF shaft An electric lead feeding type mechanical pencil characterized by being provided in a cylinder.

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