JPH028099A - Pencil sharpener - Google Patents

Abstract

PURPOSE:To enable a pencil to be normally fed even though the pencil is released from the hand when the pencil starts rotating near at hand of a user by a method wherein a pencil detection member for operating a pencil feeder by detecting presence of the pencil is established in an interior of a chuck part pinching the pencil. CONSTITUTION:An actuator 31 of a switch device 30 is put inside a pencil reception part 6 from a hole 6 formed on a side wall of the pencil reception part 6. When a pencil 8 is inserted into the pencil reception part 6, the actuator 31 is pressed by the pencil 8 to be retreated, and a contact piece in a switch device 30 is closed to impress power source voltage to a motor 1. Further, when the actuator 31 is returned to an original position, abovementioned contact piece is opened to stop application of power source voltage to the motor 1. Therefore, pencil feed operation is started in a state wherein the pencil 8 passes thoroughly through a pencil feeder 9. Even though a user releases confusedly the pencil from the hand when the pencil starts rotating, the pencil 8 is fed certainly.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a pencil sharpener.

Prior Art First, the configuration of a conventional electric pencil sharpener will be explained. In Fig. 2, l is a motor, 2 is a gear box equipped with a reduction gear, 3 is a rotating shaft for rotating the cutter,
4 is fixed to the rear end of the rotating shaft 3, and the gear box 2
This gear meshes with the reduction gear inside. 5 is a cutter having a windmill shape, as shown in FIG. 3, and is fixed to the rotating shaft 3 at the center.

6 is a pencil accommodating part whose inner surface is made to match the shape of the sharpened tip of the pencil, and becomes narrower toward the tip. Figure 4 shows a cut along a plane passing through the center of the pencil accommodating part 6. This is a cross-sectional view of the case in which an open lower portion is formed in the portion of the pencil accommodating portion 6 facing the cutter 5, and the portion of the pencil inserted into the pencil accommodating portion 6 to be sharpened protrudes from the open lower portion. In addition, the cutter 5 rotates in a position very close to the opening lower part, and the blade of the cutter 5 hits the part of the pencil that protrudes from the opening lower part, and is configured to sharpen that part. 9 is a pencil. It is a pencil feeding device provided at the upper part of the storage section 6, and the pencil 8 inserted into the pencil storage section 6 is
Send while rotating. 27 is a switch device for starting the motor l. The actuator 28 of the switch device 27 projects into a portion of the pencil passage near the pencil insertion opening. When the pencil 8 is inserted, the actuator 28 is pushed by the pencil 8, the contact piece in the switch device 27 is closed, and the power supply voltage is applied to the motor 1.

The pencil feeding device 9 is constructed as shown in FIGS. 5, 6 and 7. That is, in Figure 5, 1
0 is a first rotating member, which is equipped with rollers 11 and 12 for holding a pencil, and has gear teeth 13 formed on its outer edge. In FIG. 7, 14 is the rotating shaft of the roller 11;
Reference numeral 5 denotes a gear fixed to a rotating shaft 14, and the rotating shaft 14 is rotatably held in a bearing formed in the first rotating member 10 by a portion 16.17. On the other hand, 18 is a rotating shaft of the roller 12, and 19 is a gear fixed to the rotating shaft 18. The rotating shaft 18 is arranged at a position symmetrical to the rotating shaft 14 with respect to the pencil through hole, and is rotatably held. There is. In FIG. 5, 20 is a second rotating member, and a gear tooth portion 21 is provided on the outer edge.
is formed. 22 is a gear tooth formed inside the second rotating member 20. When the second rotating member 20 is fitted onto the first rotating member 10, the gear teeth 22 mesh with the gear 15.19 for rotating the roller 11.12.

In FIG. 6, 23 is a power transmission gear for transmitting rotational force to the first rotating member 10, and is rotated by the motor 1. A gear 24 meshes with the gear teeth 13, a gear 25 meshes with the gear teeth 21, and each is fixed to a rotatably held shaft 26.

The diameter of the gear tooth portion 21 of the second rotating member 20 is smaller than the diameter of the gear tooth portion 13 of the first rotating member 10 (the gear 25
is larger than the diameter of the gear 24, so when the first rotating member 10 rotates, the second rotating member 20 rotates faster than the first rotating member 10, and the rollers 11 and 12 rotate faster than the first rotating member 10. The second rotating member 20 rotates once at a speed corresponding to the difference in rotational speed.

Next, the operation will be explained. First, the pencil 8 is inserted through the pencil insertion slot, and when the pencil 8 presses the actuator 28, the switch device 27 becomes conductive and the motor 1 starts rotating. Accordingly, the cutter 5 starts to rotate, the first rotating member 10 and the second rotating member 20 start rotating in the direction of arrow B, and the rollers 11 and 12 also start rotating.

The pencil 8 is almost caught between the rollers 11 and 12 as shown in FIG. Then, when the pencil 8 is further pushed in and is completely sandwiched between the rollers 11 and 12, the pencil 8 is pushed in between the rollers 11 and 12.
The rotation of 2 sends it in the direction of arrow C. Problem to be Solved by the Invention However, in the conventional configuration, the chuck part, that is, the roller 1
1 and roller 12, the first rotating member 10 has already started rotating, and the pencil 8 and roller 11.
12, the rotation of the first rotating member is transmitted to the pencil 8, and before the pencil 8 is completely sandwiched between the rollers 11 and 12, it starts rotating just by hitting the rollers 11 and 12. When the pencil 8 begins to rotate in the user's hand, the user who is not accustomed to using it may be in a hurry and let go of the pencil 8. If the user lets go of the pencil 8, the 10is will move the roller 11, There was a problem that they were left behind without being completely caught in the middle of the 12th, and were never sent away.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a pencil sharpener in which the pencil is already clamped in the chuck part when the chuck part rotates, and the pencil can be reliably fed. shall be.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a pencil detection member deep inside the chuck portion that holds the pencil, which detects the presence or absence of a pencil and operates the pencil feeding device.

Operation With the above structure, the pencil detection member detects the pencil after the pencil is securely clamped by the chuck part, and the pencil feeding device starts operating in a state where the pencil is securely clamped.

EXAMPLE Hereinafter, an example of a pencil sharpener according to the present invention will be described. In this embodiment, since the configuration is similar to that of the conventional example shown in FIGS. 2 to 7, the same numbers are given to the components having the same configuration. That is, 1 is a motor, 2 is a gear box for reduction, 3 is a rotating shaft, and 4 is a gear.

Reference numeral 5 designates a cutter, 6 a pencil accommodating portion, and 9 a pencil feeding device, which are constructed in the same manner as in the conventional example, so detailed explanations will be omitted.

In FIG. 1, 30 is a switch device for starting the motor 1, and is provided on the side of the pencil accommodating portion 6. Then, the actuator 31 of the switch device 30 is inserted into the pencil accommodating portion 6 from the hole 32 formed in the side wall of the pencil accommodating portion 6.
When the pencil 8 is inserted into the pencil accommodating portion 6, the actuator 31 is pushed back by the pencil 8. When the actuator 31 moves back, the contact piece in the switch device 30 closes and the motor l
Power supply voltage is applied to. Further, when the actuator 31 returns to its original position, the contact piece opens and the application of power supply voltage to the motor 1 is stopped.

Next, the operation will be explained. When the user inserts the pencil 8 from the upper pencil insertion slot, the tip of the pencil 8 first hits the rollers 11 and 12. At that time, the user will feel some resistance. When the user pushes the pencil 8 further, the pencil 8 is completely sandwiched between the rollers 11 and 12. However, in this state, the motor 1 does not rotate yet, and the pencil feeding device flt9 remains stopped. When the user pushes the pencil 8 further, the pencil 8 pushes the actuator 31 protruding into the pencil accommodating portion 6. When the actuator 31 is pushed back, the switch device 3
0 becomes conductive, and motor 1 starts rotating. Along with this, the first rotating member 10 and the second rotating member 20 of the pencil feeding device c9 begin to rotate in the direction of arrow B, and the internal rollers 11 and 12 also begin to rotate. At the same time, the cutter 5 also starts rotating and cutting begins. The pencil 8 is fed in the direction of arrow C by the rotation of rollers 11 and 12 in the pencil feeding device 9.

In this embodiment, the motor 1 is started only when the switch device 30, which is provided at the back of the pencil 8 and the pencil feeding device 9, is in a conductive state. That is, pencil 8
The pencil feeding operation is started when the pencil has completely penetrated the pencil feeding device 9. Therefore, even if the user takes his hand off the pencil in a hurry when the pencil starts rotating, the pencil 8 is already completely caught between the rollers 11 and 12, so the pencil 8 It will definitely be sent.

By the way, when the pencil detecting means such as the switch device 30 is provided further back than the pencil feeding device, the following problems occur. In other words, if a very short pencil is inserted or if the user leaves the pencil inserted, the rear end of the pencil will get inside the device, but if the pencil detection means is located further back than the pencil feeding device 9. , the motor 1 continues to rotate even when the rear end of the pencil reaches the pencil feeding device 9. If the rear end of the pencil comes off the roller in the pencil feeding device 9, it becomes impossible to feed the pencil, the pencil 8 is left behind in the pencil accommodating section 6, and the motor 1 is not rotating. It becomes a state of silence. Since this is inconvenient, a configuration as shown in FIG. 2 may be considered.

In FIG. 2, 33 is a switch device provided near the pencil insertion slot, and an actuator 34 of the switch device 33 projects into the pencil path.

When the pencil 8 is inserted, the actuator 3 is activated by the pencil 8.
4 is pressed and retracted, and when the actuator 34 is retracted, the switch device 33 becomes conductive. And switch equipment N! 130 and the switch device 33 are inserted in series in a circuit for driving the motor 1, and the actuator 31
The motor 1 is configured to be driven only when both the actuator 34 and the actuator 34 are pressed. When the pencil is inserted, the actuator 34 is first pressed by the pencil, and the switch device 33 becomes conductive. Then, when the pencil advances further and enters the pencil accommodating section 6 through the pencil feeding device 9, the actuator 31 is pushed by the pencil, and the inside of the switch device 30 becomes conductive. Then, at the same time that the switch device 30 becomes conductive, the motor 1 is started, the pencil feeding device 9 starts its feeding operation, and the cutter 5 also starts rotating.

In this embodiment, the motor 1 is started only when the pencil 8 pushes the actuator 31 located at the back of the pencil feeder 9, so there is no need to insert a pencil into the pencil feeder that has already started rotating. Furthermore, if a very short pencil is inserted or the user leaves the pencil inserted, even if the rear end of the pencil enters the interior through the pencil insertion slot, the end of the pencil will not pass past the actuator 34. If the actuator 34 returns to its original position, the Sui-Sochi installation f
W33 enters the cutoff state, and the motor 1 can be stopped.

Effects of the Invention As described above, the present invention includes a pencil detection member that detects the presence or absence of a pencil at the back of the chuck portion that holds the pencil and operates the pencil feeding device, so that when the pencil starts rotating,
Since the pencil is securely held in the chuck, even if the user releases the pencil in a hurry when it starts to rotate in the user's hand, the pencil will not be fed normally. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view taken along the pencil insertion hole of a pencil sharpener according to an embodiment of the present invention, Fig. 2 is a central longitudinal sectional view of a conventional pencil sharpener, and Fig. 3 is a longitudinal sectional view of the pencil sharpener according to an embodiment of the present invention. 4 is a longitudinal sectional view taken along the pencil insertion hole of the same pencil sharpener, FIG. 5 is an exploded perspective view of the pencil feeding device of the same pencil sharpener, and FIG. 6 is a diagram of the same pencil sharpener. A perspective view of the pencil feeding device, FIG. 7 is a plan view of the first rotating member of the pencil feeding device of the same pencil sharpener, and FIG. 8 is a cross section showing a state in which a pencil is caught in the pencil feeding device of the same pencil sharpener. It is a diagram. 1... Motor 2... Gear box 3
... Rotating shaft 5 ... Cutter 6 ...
-Pencil storage section 9...Pencil feeding device 10...
・First rotating member 11.12...Roller 20...
・Second rotating member 30... Switch device 31... Actuator Figure 1 Name of agent Patent attorney Toshio Nakao and one other person Figure Figure Figure Figure

Claims (1)

[Claims] It has a cutter rotated by a motor, a chuck part that holds the pencil, and a pencil feeding device that feeds the pencil while rotating the chuck part by the power from the motor, detects the pencil in the back of the chuck part, and removes the pencil. A pencil sharpener featuring a sensor that operates the motor.