JPH09202097A - Electrically driven eraser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically driven eraser which makes a user need not to perform a troublesome operation of switching by a finger while grasping a casing, and the casing of which can be made thin to provide a good operationality. SOLUTION: A motor 2 and a battery 3 are received before and behind in series in a casing 1, which enables grasping, and an eraser holder 7, to which an eraser 6 is detachably mounted to extend beyond an opening 5 on a front end of the casing 1, is mounted to a rotating shaft 4 extending forward from the motor 2. Mounted to the motor 2 is a spring 8 which allows the motor 2 to slide before and behind in the casing, maintains a forward position of the motor 2 when the motor 2 is not actuated by outer pressures, and deforms, when the eraser 6 is subject to pressures from a sheet surface 15 at the time of erasing operation, to permit the motor 2 to retreat. A switch mechanism is provided which is made ON by the retreating of the motor 2 to revolve the motor 2, and is made OFF by the advancing of the motor 2 to stop the rotation of the motor 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electric eraser.

[0002]

2. Description of the Related Art An electric eraser erases writing lines by rotating an eraser using a motor. In the conventional electric eraser, a motor and a battery are housed inside a grippable case, an eraser holder protruding from the front end opening of the case is attached to a rotating shaft protruding forward from the motor, and the motor is attached to the side of the motor. The switch has a structure for rotating or stopping the rotation.

[0003]

The conventional electric eraser described above requires the user to operate the switch with his / her finger while gripping the case, and since the switch is attached to the side surface of the case, the case is thick. However, there was a complaint that the operability was not good. It is an object of the present invention to solve such a problem, that is, to provide an electric eraser that is easy to operate and does not have the trouble of operating a switch with a finger, and has a thin case.

[0004]

In order to achieve the above object, the electric eraser of the present invention has a motor 1 in which a motor 2 and a battery 3 are housed in a front-rear direction so as to be arranged in tandem. An eraser holder 7 is attached to a rotating shaft 4 projecting forward from the case 2 so that an eraser 6 can be detached from the front end opening 5 of the case 1, and the motor 2 can be slidable in the front-back direction in the case. Although the forward movement of the motor 2 is maintained in a state in which there is no external pressure on the motor 2, the spring 8 that allows the eraser 6 to deform and retreat the motor 2 when pressure is applied from the paper surface 15 during the erasing operation.
And a switch mechanism that stops the rotation of the motor 2 by turning the motor 2 into an ON state by rotating the motor 2 and turning the motor 2 in an OFF state by moving the motor 2 forward. It is equipped with.

[0005]

When the front end of the eraser 6 attached to the eraser holder 7 is brought into contact with the paper surface 15, that is, when the paper surface 15 is slightly pressed to prepare for the erasing operation, the eraser 6 is pushed in the opposite direction and the motor 2 is moved to the case. 1, the switch is turned on, the eraser 6 rotates together with the rotating shaft 4 of the motor 2, and the erasing operation is started. And
When the erasing work is completed and the eraser 6 is separated from the paper surface 15, the force of the spring 8 advances the motor 2 to turn off the switch, and the rotation of the motor 2 is stopped. That is, the electric eraser of the present invention does not have the trouble of operating the switch with a finger. Further, since the electric eraser of the present invention obtains the ON and OFF states of the switch by the backward and forward movement of the motor 2, it is not necessary to attach a switch operated by a finger to the side surface of the case, and the case 1 does not become thick. .

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, in the figure, reference numeral 1 is a case, and this case 1
Has a cylindrical shape with both front and rear ends opened, the front end portion is tapered, and a cap 9 is screwed to the rear end opening in a detachable manner. Next, reference numeral 2 is a motor, which is housed in the front part of the case 1. The motor 2 is not fixed to the case 1 but is slidable in the front-rear direction inside the case 1. An eraser holder 7 is attached to the tip of the rotary shaft 4 protruding forward from the motor 2, and the eraser holder 7 is attached to the case 1
Extends through the front end opening 5. Of course, the eraser 6 can be detachably attached to the eraser holder 7. A battery 3 is housed behind the motor 2 inside the case 1, and a coil spring 8 is interposed between the motor 2 and the battery 3. Battery 3
Is pressed by the coil spring 8 so that the negative electrode on the rear end surface thereof is always in contact with the cap 9. At the center position of the rear end surface of the motor 2, there is provided a protrusion 10 that can come into contact with the + pole of the front end surface of the battery 3 when retracted. The protrusion 10 serves as a contact of the switch. A claw piece 11 protruding laterally is provided at the end of the rear end surface of the motor 2. The claw piece 11 is slidably fitted in a longitudinal groove 12 formed in the inner surface of the case 1 to stop the rotation of the motor 2. Lead wires (not shown) of the motor 2 are connected to the projection 10 and the claw piece 11 inside the motor 2, respectively. Both the projection 10 and the claw piece 11 have electrical conductivity, and both are separated by an insulator 13. Both the case 1 with which the claw piece 11 contacts and the cap 9 with which the rear end surface of the battery 3 contacts have electrical conductivity. A step portion 14 that restricts the forward movement of the motor 2 is provided near the front end on the inner surface of the case 1.

When the erasing operation is not performed, as shown in FIG. 2, the motor 2 is maintained in the advanced state by the force of the coil spring 8, the protrusion 10 is separated from the front end face of the battery 3, and the switch is turned off. Has become. Next, as shown in FIG. 1, when the eraser 6 is applied to the paper surface 15 and slightly pressed,
That is, when the erasing operation is performed, the motor 2 retracts while compressing the coil spring 8, the protrusion 10 comes into contact with the front end surface of the battery 3 to turn on the switch, and the motor 2 rotates to rotate the rotating shaft. The eraser holder 7 attached to 4 and the eraser 6 rotate integrally, and the rotating eraser 6 rubs the paper surface 15 to erase writing lines and the like.
Then, when the erasing operation is completed and the eraser 6 is separated from the paper surface 15, the state shown in FIG. 2 is restored again and the rotation of the motor 2 is stopped.

[0008]

The electric eraser of the present invention is as described above, and since there is no trouble of operating the rotation and stop of the motor 2 with a finger and the shaft diameter of the case 1 can be made thin, it is like a writing instrument. It is possible to perform the erasing work as written in, and the operability is greatly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where an erasing operation is being performed.

FIG. 2 is a cross-sectional view showing a state in which an erasing operation is not performed.

[Explanation of symbols]

 1 Case 2 Motor 3 Battery 4 Rotating Shaft 5 Front End Opening 6 Eraser 7 Eraser Holder 8 Spring 9 Cap 10 Protrusion 11 Claw Piece 12 Groove 13 Insulator 14 Step 15 Paper

Claims (1)

[Claims] A motor 1 and a battery 3 are housed in a grippable case 1 in a front-rear arrangement so as to be arranged in tandem, and a rotary shaft 4 projecting forward from the motor 2 extends through a front end opening 5 of the case 1. The eraser 6 is attached to the removable eraser holder 7, the motor 2 is slidable in the front-back direction in the case, and the forward movement state of the motor 2 is maintained without any external pressure applied to the motor 2. At a time, the eraser 6 is deformed when pressure is applied from the paper surface 15 and a spring 8 for assembling the motor 2 is mounted, and when the motor 2 is retracted, the spring 8 is turned on to rotate the motor 2 and to rotate the motor 2. An electric eraser equipped with a switch mechanism for turning off the motor 2 by advancing forward.