JP4584467B2 - Knock structure such as stationery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a knock structure having a push bar that is urged rearward by a knock spring and moves back and forth in conjunction with a knock button in a stationery or the like.
[0002]
[Prior art]
Conventionally, there are pencil sharpeners that can change the core diameter of the pencil shaving, and as a means of adjusting the core diameter, the core plate with which the tip of the pencil core contacts and the position of the core plate There is a structure having a push rod whose tip is brought into contact with the core plate in order to change, and a knock mechanism composed of a knock button, a knock spring or the like for moving the push rod forward or backward. By the way, in the pencil sharpener having such a structure (shown in FIGS. 1 and 2), in order to set the core diameter of the pencil sharpening, the knock button is pushed to advance the push rod. Due to the structure of the pencil sharpener, there is a problem that the front end of the push bar interferes with the cutting blade. Therefore, one side of the front portion of the push rod is cut out to make the cross section flat so that the cutting blade does not interfere. However, because the front part of the push rod is flat, the front end of the push rod is decentered with respect to the axial direction of the forward and backward movement due to deformation of the knock spring and large play with respect to the inner diameter of the knock spring. There are accidents that damage the knock bar or cutting blade.
[0003]
Further, the knock spring 2 shown in FIG. 3 has a line end portion 2a bent in a substantially horizontal direction on the rear end side, and the spring end portion is fitted to the push rod 1 by the line end portion 2a. At the same time, the tip of the push rod 1 is restricted so as not to approach the cutting edge. However, when the pitch of the knock springs is appropriately large, the front end of the push rod 1 is eccentric with respect to the axial direction of the forward and backward movement. A case occurred, and it was not possible to reliably avoid interference with the cutting edge.
[0004]
[Problems to be solved by the invention]
Therefore, the present invention solves the above-described problem of the pencil sharpener and, in stationery, etc., the front part of the push rod that is urged backward by a knock spring and moves back and forth in conjunction with the knock button is flat or deformed. Even if it becomes, it becomes possible to operate normally the article located in the front.
[0005]
[Means for Solving the Problems]
The present invention has the following configuration in order to achieve the above-described problems. Knock structures such as stationery according to the invention of claim 1, in the knock structures such as stationery with a knock mechanism composed of the knock button and Nokkubane for advancing or retracting the push rod, the push rod The guide part is formed by bending the front end of the knock spring attached to the outer periphery of the push rod and bending the line end at the position where the front part is eccentric with respect to the axis or the axis. The front part of the push rod is inserted without swinging.
[0006]
A knock structure of a stationery or the like according to the invention of claim 2 is a knock structure of the invention stationery or the like of claim 1, in which a line bent in a substantially horizontal direction having a lead angle inclination at the rear end of the knock spring. An end portion is provided, and a line end portion at the rear end of the knock spring is brought into contact with the front surface of the collar portion formed on the push rod, and the knock spring is locked to the push rod so as not to fall off.
[0007]
The knock structure of the stationery or the like according to the invention of claim 3 is a position of the knock structure of the invention stationery or the like of claim 1 or 2 in order to adjust the core diameter of the pencil shaving. A push bar whose tip is brought into contact with the core abutting plate is arranged so as not to interfere with the cutting edge of the pencil sharpener.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a cutting mechanism of a pencil sharpener, FIG. 1 is an external view showing the whole, and FIG. 2 is a view showing a part of the structure of a main part. First, the rotating shaft 4 is rotated by an operation of a manual handle, and the cutting blade 3 is attached to the rotating shaft 4 so as to rotate in a conical shape.
[0009]
Near the rear end of the cutting blade 3, in the back of the pencil insertion hole, there is disposed a core plate 6 that abuts the tip of the pencil core, and this core plate 6 is formed on the cylindrical surface of the cutting blade 3. It can move in parallel. A horizontal hole 9 is provided on the extension line of the pencil insertion hole on the rotating shaft 9 behind the core plate 1, and the push bar 1 is inserted into the horizontal hole, and the push bar is moved forward or backward. The knock mechanism 10 is attached. The knock mechanism 10 is a so-called Kahn type, and is employed in a general knock type ballpoint pen. The knock button 5 and a cylinder having a cam or groove (not shown) formed on the inner surface, A rotor (not shown) housed inside the cylinder and a knock spring 2 attached to the outer periphery of the push rod 1 and urging the rotor and the knock button 5 backward together with the push rod.
[0010]
When the knock button 5 is knocked, the rotor rotates by a certain angle and is locked to the front end of the cam provided on the inner surface of the cylinder to maintain the forward movement state. Next, when the knock button 5 is knocked, the rotor becomes constant again. The groove is retracted by the force of the knock spring 2 by rotating the angle to release the locked state. The push rod 1 moves forward or backward together with the rotor with the rear end in contact with the rotor.
[0011]
The front end of the push bar 1 abuts on the rear surface of the above-described core plate 6, and when the push rod 1 moves forward, the core plate 6 is pushed and moves forward. A side surface facing the cutting edge 3 at the front end of the push rod 1 has a notch, and the cross section is substantially semicircular or flat on a rectangle. Further, a flange portion 11 having a rectangular cross section (not shown) is integrally formed at a substantially central portion of the push rod 1. The cross section of the portion where the flange portion 11 of the push rod 1 is inserted in the horizontal hole 9 is also rectangular, and the push rod 1 is prevented from rotating with respect to the rotating shaft 4.
[0012]
The knock spring 2 is coiled and attached to the outer periphery of the push rod 1 as described above, and its rear end is in contact with the front surface of the flange portion 11. The contents of the above-described embodiment are the same as those of the conventional example.
[0013]
Conventionally, both ends of a knock spring used in a normal knock mechanism are parallel to each other. However, in the conventional example of a pencil sharpener, as shown in FIG. 3, the rear end is bent substantially horizontally with an inclination of the lead angle. The rear end of the knock spring 2 is brought into contact with the front surface of the flange formed on the push rod, and the knock spring is locked to the push rod so as not to fall off. Yes.
[0014]
(Summary of Embodiment) FIG. 4 shows a form of a knock spring 7 and a push bar 1 constituting a knock structure of a stationery or the like according to the first embodiment as a correspondence to a pencil sharpener. As shown in the figure, at the front end of the knock spring 7, a wire end portion 7b wound to have a small diameter is formed so as to be close to one of the coil diameters of the knock spring 7, and the outer circumference of the small diameter wire end portion 7b is The front portion of the push rod 1 having a flat cross section at a position eccentric with respect to the shaft center is inserted into a space (guide portion) formed between the inner circumference of the coil diameter and the knock spring 7 is expanded and contracted. Accordingly, it can be moved back and forth without swinging. Further, the rear end has a line end portion 7a bent substantially horizontally with an inclination of the lead angle, and the rear end line end portion 7a of the knock spring 7 is formed on the front surface of the collar portion formed on the push rod 1. The knock spring 7 is locked to the push rod 1 so as not to fall off. Note that the line end portion 7a is not essential as a basic configuration, but is effective as a guide when the knock spring 7 is attached to the push rod 1 and prevention of dropping. Other configurations are the same as those of the conventional example described above, and a description thereof is omitted.
[0015]
FIG. 5 shows a form corresponding to a pencil sharpener in the form of a knock spring 8 and a push bar 1 constituting a knock structure of a stationery or the like according to the second embodiment. As shown in the figure, the front end of the knock spring 8 is formed with a line end portion 8 b bent substantially horizontally, and is formed between the line end portion 8 b and the inner circumference of the coil diameter of the knock spring 8. The front portion of the push rod 1 having a flat cross section at a position eccentric with respect to the shaft center is inserted into the space (guide portion), and can be moved back and forth without swinging as the knock spring 8 expands and contracts. The rear end line end 8a is the same as that of the first embodiment.
[0016]
In addition, the push bar has a deformed or flat cross section at the position where the front part is eccentric with respect to the shaft center or the shaft center as a correspondence to various stationery, and the line end part of the front end of the knock spring attached to the outer periphery of the push bar Are formed as corresponding guide portions.
[0017]
[Action]
When the push button 1 is pushed forward by pushing the knock button 5, the front portion of the push rod 1 is guided and slid by the guide portion formed at the front end of the knock spring while the knock spring 7 or 8 is compressed. The front portion is not inclined and the front end of the push rod 1 is prevented from interfering with the cutting blade 3.
[0018]
【The invention's effect】
The present invention, in the knock structure provided to adjust the core diameter of a pencil sharpener as described above, can be reliably prevent interference between the cutting edge when advancing the push rod by pushing the knock button Therefore, the problem of damaging the cutting blade or damaging the cutting blade or the push bar can be avoided. In the case of stationery or the like, even if the front portion of the push rod that moves back and forth in conjunction with the knock button is flat or deformed, it is possible to normally operate the article located in front of the push rod.
[Brief description of the drawings]
FIG. 1 is an external view showing a cutting mechanism of a pencil sharpener.
FIG. 2 is a partial cross-sectional view of a main part of a cutting mechanism.
FIG. 3 is a view showing a form of a knock spring and a push rod constituting a knock structure of a pencil sharpener of a conventional example.
FIG. 4 is a view showing a form of a knock spring and a push rod that constitute a knock structure of a stationery or the like that is Embodiment 1. FIG.
FIG. 5 is a view showing a form of a knock spring and a push rod constituting a knock structure of a stationery or the like that is Embodiment 2.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Push bar 2 Knock spring 2a Line end part 3 Cutting blade 4 Rotating shaft 5 Knock button 6 Core pad 7 Knock spring 7a Line end part 7b Line end part 8 Knock spring 8a Line end part 8b Line end part 9 Horizontal hole 10 Knock mechanism 11 鍔Part

Claims (3)

In the press knock button and Nokkubane for advancing or retracting the rod knock structures such as stationery with a knock mechanism constituted, its cross-section at a position where the front portion of the push rod is eccentric to the axis or axis The front end of the push rod is inserted into the guide portion formed in the guide portion formed in the guide spring formed at the front end of the knock spring which is attached to the outer periphery of the push rod. Knock structure such as stationery. Provided at the rear end of the knock spring is a line end that is bent in a substantially horizontal direction with an inclination of the lead angle. The line end at the rear end of the knock spring is brought into contact with the front surface of the collar formed on the push rod, The knock structure of a stationery or the like according to claim 1, wherein the knock structure is locked to the push bar so as not to fall off.  2. A push rod that abuts the tip against a core plate that changes position in order to adjust the core diameter of the pencil sharpening is disposed so as not to interfere with the cutting edge of the pencil sharpener. Knock structure such as stationery described in 2.

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