JPH0247360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric pencil sharpener having a function to prevent unnecessary sharpening.

Conventional Structures and Problems Generally, some electric pencil sharpeners turn off the motor circuit directly or indirectly by pressing the tip of the pencil lead to stop the motor when the pencil is sharpened. When the motor is simply stopped in this way, the cutter rotational speed gradually slows down and stops when the motor is stopped, causing the problem that the cutter digs into the cutting surface of the pencil and causes fuzz on the cutting surface.

For this reason, some devices detect when a pencil is sharpened and separate the cutter from the cutting surface of the pencil. Although this method allows the cutting surface of the pencil to be finished neatly, the motor continues to rotate even when cutting is stopped, which is not desirable in terms of power consumption. Additionally, the completion of cutting is intuitively slower than in the case where the motor stops.

Therefore, it is preferable to combine a mechanism for separating the cutter from the cutting surface of the pencil upon completion of cutting with a mechanism for stopping the motor.

By the way, the conventional mechanism for separating the cutter from the cutting surface of the pencil was constructed as shown in FIG. That is, a cutter holder 27, a cylindrical cutter 29 which is rotatably provided on the cutter holder 27 by a cutter shaft 28, a lead tip abutment plate 31 which is pushed by the tip of the pencil 30, and a lead tip abutment plate 31 which is pivotally connected to the tip abutment plate 31. , a reaction plate 32 for sliding the cutter shaft 28 forward, and a spindle 33 serving as a fulcrum for the reaction of the reaction plate 32.

Then, as the pencil 30 is sharpened, the lead tip stopper plate 31 is pushed in, as shown in FIG. 6a.
As shown in Figure b, the cutter shaft 28 is rotated by the reaction plate 32.
is slid forward, the annular recessed step 34 provided on the outer periphery of the front part of the cutter shaft 28 corresponds to the front bearing body 35, and since the cutter holder 27 is rotating, using centrifugal force, The cutter shaft 28 is deviated outward by the depth of the annular recess 34, that is, the cutter 29 is separated from the cutting surface of the pencil 30 to prevent over-sharpening. Further, by changing the position of the stopper 36 to which the spindle 33 is fixed, the separation point of the cutter shaft 8, that is, the thickness of the tip can be adjusted.

In this way, the spindle 33 is fixed to serve as a fulcrum for the reaction plate 32 when the pencil 30 is pushed in, and the spindle 33 is used to turn the switch to stop the rotation of the motor or the switch to complete cutting. Design-wise, it is difficult to create a mechanism that operates. This is because one end of the spindle 33 must be fixed and cannot press the actuator of the switch.
Furthermore, in Japanese Patent Application Laid-Open No. 57-181900, the member corresponding to the spindle 33 shown in FIG. The inserted one is shown. This is because the lead of the pencil presses against the lead plate,
The centering plate abuts against and pushes the protruding portion of the operating rod, and the operating rod further pushes the movable switch piece on the opposite side, thereby stopping the motor.

However, such a configuration requires an L-shaped actuating rod, and the manufacturing cost increases by the L-shaped bending of the actuating rod. Further, it is necessary to provide the fulcrum member with a notch through which the protruding portion of the operating rod passes. However, the fulcrum member is a very thin tube, and in order to create a notch, it is necessary to cut by applying a thin rotary blade to the end of the fulcrum member, which is difficult to work with and improves productivity. I had a problem with not doing it.

Purpose of the Invention The present invention has been made in consideration of the above-mentioned conventional problems, and an object of the present invention is to provide an electric pencil sharpener in which the cutter is released when the cutting is completed, and the motor can be stopped by activating a switch when the cutting is completed. It is something.

Structure of the Invention In order to achieve the above-mentioned object, the present invention is a pencil sharpener configured to separate the cutter from the pencil when sharpening the pencil to prevent over-sharpening, in which the cutter separates the operating tube that is pushed by the lead stopper plate. It is fitted onto a spindle for determining operation, and the operating tube controls the opening and closing of switches such as motors, realizing a switch operating mechanism that has hitherto been considered difficult to combine.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, 1 is the main body of the electric pencil sharpener,
It has an insertion slot 3 into which a pencil 2 is inserted, and a cutting mechanism section 4 and a motor 5 for driving the cutting mechanism section 4 are provided inside. A power switch 6 that is turned on is provided, and this power switch 6 is inserted into the power circuit of the motor 5.

The cutting mechanism section 4 includes a cutter holder 8 having a pencil insertion section 7, and a cutter shaft 9 attached to the cutter holder 8.
A cylindrical cutter 1 is rotatably held by a cylindrical cutter 1 and is located on one side of the pencil insertion portion 7.
It's getting better than 0. The cutter holder 8 is rotatably held by the main body 1, and the rotation of the motor 5 is transmitted via a pinion 11 and a gear 12. The cutter 10 also has a gear 13 at the end.
is meshed with an internal gear 14 for planetary rotation.

A tip stopper plate 15 is provided at the innermost part of the pencil insertion portion 7 of the cutter holder 8 so as to be slidable back and forth, and a reaction plate 16 is pivotally attached to the lead tip cover plate 15. The reaction plate 16 has its center portion abutting the front end of a spindle 17 that is provided so as to pass through the center of the rear pivot portion of the cutter holder 8, and its free end abutting the rear end of the cutter shaft 9 of the cutter 10. There is.

The cutter shaft 9 is slidable back and forth,
An annular recess 18 is provided on the outer periphery of the front end, and a bearing body 1 receives the front end of the cutter shaft 9.
9 is formed at an inner width that fits into the annular portion 18 .

The cutter shaft 9 is urged rearward by a spring 20.

The spindle 17 serves as a reaction fulcrum for the reaction plate 16, and passes through holes in the tip abutment plate 15 and the switch operating plate 21, and its rear end abuts against a stopper 22. Further, the spindle 1
7 is fitted with the actuating pipe 23, and the actuating pipe 23
can be freely slid back and forth. This operating tube 2
3 has its front end in contact with the core tip abutment plate 15, and its rear end in contact with the front surface of the switch operating plate. The switch actuating plate 21 is pivotally mounted on a support shaft 25, and its rear portion corresponds to an actuator 26 of the motor switch 24.

In the above configuration, when the pencil 2 is inserted into the pencil insertion slot 3, the power switch 6 is closed, the motor 5 is driven, the cutter holder 8 is rotated via the pinion 11 and the gear 12, and the cutter 10 is also engaged with the internal gear 14. The planet rotates because it is on.
When the pencil 2 is continued to be pushed in, the pencil 2 is cut by the cutter 10. During this cutting, the tip of the pencil 2 presses the tip of the lead plate 15 and the spindle 1
7 comes into contact with the stopper 22 (FIG. 5a). As the cutting progresses further, the reaction plate 16 reacts using the spindle 17 as a fulcrum, causing the cutter shaft 9 to slide forward. Then, the annular recess 18 of the cutter shaft 9
aligns with the bearing body 19 as shown in FIG. 3, and the cutter 10 is completely separated from the pencil 2.

An operating tube 23 that fits into the spindle 7 when cutting is not performed from the pencil cutting surface of the cutter 10.
is gradually moved rearward by the tip stop plate 15. For example, when it has been moved to a distance S as shown in FIG. make it stop. Then, the cutter 10 also stops rotating to complete cutting. When the pencil 2 is pulled out after the cutting is completed, the power switch 6 is turned off and the motor 5 does not rotate. Then, the cutter shaft 9 is slid back by the spring 20, and the motor switch 24 is also returned to the closed position.

As described above, in this embodiment, in the configuration in which the cutter 20 is separated from the cutting surface of the pencil 2 when cutting is completed, the spindle 17, which is the fulcrum of the reaction plate 16,
The movement of the core tip abutment plate 15 is transmitted to the switch operation plate 21 through the operation tube 23 without impairing the function of the motor 5.
The switch 24 can be controlled to open, thereby preventing power consumption due to idle rotation of the cutter 10.

Further, when the actuating tube 23 actuates the motor switch 24, the spindle 17
From the state in which the cutter 10 is in contact with the cutter 10, there is an operating width equal to the width S shown in FIG.

Effects of the Invention As described above, the present invention includes a slidable actuating tube, a spindle that slidably penetrates the actuating tube, and a stopper that receives and positions the other end of the spindle. By configuring the switch actuation plate to be actuated by pressing it with the core end contact plate, the motor can be automatically stopped when the cutting is completed, and the L-shaped actuation rod and this operation There is no need to provide a thin tube with a notch in order to penetrate the protruding part of the rod, and workability during manufacturing is good and productivity can be improved. Moreover, the function of releasing the cutter can be used as is, and the operating point of the switch can be easily adjusted to synchronize with the release of the cutter, which is highly effective.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electric pencil sharpener according to an embodiment of the present invention, Figs. 2 and 3 are sectional views for explaining the operation of the main parts, and Fig. 4 is a top view of the motor switch section. 5 is an explanatory diagram of the motor switch operating section, and FIG. 6 is a sectional view of the cutting mechanism section of a conventional electric pencil sharpener. 1...Body, 2...Pencil, 5...Motor, 6...
...Power switch, 8...Cutter holder, 9...
Cutter shaft, 10... Cutter, 15... Lead end contact plate, 17... Spindle, 19... Bearing body, 21
...Switch operating plate, 22...Stopper, 23
...Actuation pipe, 24...Motor switch.

Claims (1)

[Claims] 1. A rotatable cutter holder, a spindle coaxially inserted into the rotation shaft of the cutter holder, a cutter rotatably held in the cutter holder by the cutter shaft, and a cutter that is pressed by the tip of a pencil lead. a lead end stopper plate that slides, and is rotatable about one end of the spindle as a fulcrum; one end engages with the lead end stopper plate, and the other end abuts one end of the cutter shaft, and the cutter shaft a reaction plate for sliding the cutter away from the cutting surface; a stopper for receiving the other end of the spindle and positioning the spindle; an actuating tube is slidably fitted to the spindle; An electric pencil sharpener comprising a motor switch which is configured to operate a switch operating plate by pressing it with a lead end stopper plate, and which is shut off by the operation of the switch operating plate.