JPH0713643Y2 - cutter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter, and more particularly to a novel cutter capable of cutting a work piece in a single stroke by following the cutting edge in the cutting direction.

[0002]

2. Description of the Related Art As a conventional example, there are a "cutter" shown in FIG. 9 and a "cutting pen" disclosed in Japanese Utility Model Laid-Open No. 2-78171. The former cutter 5
0 uses a cutter blade 51 in which a blade portion 51b is provided at one end of a needle-shaped handle portion 51a and a stopper 51c is provided at the other end. The stopper 51c is formed in a columnar shape having a diameter larger than the diameter of the handle 51a at a portion in contact with the handle 51a, and a conical tip portion 51d is provided on a plane portion of the columnar. The cutter blade 51 configured in this manner allows the spring 52 to penetrate the handle portion 51a, and the handle portion 51a has the sleeve 5 provided on the base 53.
4 is inserted from its opening end 54a, the side surface of the cylinder of the stopper 51c is brought into contact with the inner wall of the protruding portion 55, and the conical tip 51d of the stopper 51c is fixed in the protruding portion 55. It is in contact with the portion 56. Then, by utilizing the restoring force of the spring 52 locked between the opening end portion 54a of the sleeve 54 and the stopper 51c, the cutter blade 51 rotates the feeding portion 55 in the axial direction. It is attached so that it can appear and disappear. In this way, the cutter 50
The cutter blade 51 attached to the tip shaft portion of the blade blade 51b itself is not fixed to the tip shaft portion, so that the blade portion 51b moves in the direction (cutting direction) of the cutter 50 (shaft body).
It is ready to be followed.

On the other hand, in the latter cutting pen, the cutter portion is made of a magnetizable material, and the bearing portion for supporting one end of the cutter portion is made of a magnetic material.

[0004]

However, in the former cutter 50, the stopper 51c is pressed against the pressing portion 56 by the restoring force of the spring 52, and the cylindrical side surface portion of the stopper 51c is the protruding portion 55. Since it is in contact with the inner wall of the blade, friction has occurred, so that the blade portion 51b of the cutter blade 51 can be smoothly moved.
Could not be driven in the traveling direction of the cutter 50. Therefore, the shaft body of the cutter 50 must be rotated in the cutting direction so that the blade portion 51b always faces the cutting direction, that is, the edge of the blade portion 51b can trace the cutting line. Further, if the shaft is not rotated sufficiently, the work piece will be damaged.

In the latter "cutting pen",
Adjustment of the cutting edge of the cutter (adjustment of the blade extension amount) requires a two-step procedure of positioning the pivot bearing by advancing and retracting the pivot holder and fixing it with the set screw, which enables quick positioning of the cutting edge. There wasn't. Further, both the former and the latter have a complicated structure and a high manufacturing cost.

Therefore, in the present invention, the blade portion always follows in the traveling direction (cutting direction) of the shaft body, and cuts as if it were a single stroke.
An object of the present invention is to provide a cutter at a low cost, which enables a cutting operation to be performed and a blade amount to be adjusted quickly.

[0007]

In order to achieve the above object, a cutter of the present invention comprises a hollow shaft body, suction means arranged in the shaft body, for sucking one end of a cutter blade, and the shaft. A slide pin attached to the suction means so as to intersect with the axial direction of the body, and a tip of the slide pin so that the suction means can be slid in the axial direction of the shaft body through the slide pin. An opening hole protruding outside the shaft body, a cam groove for engaging the tip of the slide pin protruding from the opening hole are provided on the inner wall, and a cutting edge adjusting portion coaxially attached to the outer circumference of the shaft body is provided. Configured.

[0008]

Since the cutter blade is attached to the suction means by suction, the cutter blade is attached to the suction means with a slight contact surface of the cutter blade. Adjustment of the blade extension amount of the cutter blade attached in this manner is performed by the blade tip adjusting unit. That is, when the blade tip adjusting portion is rotated in either the left or right direction, the rotation causes the suction means to slide in the axial direction via the cam groove and the slide pin, and the blade protrusion amount of the cutter blade along with the slide. Can be adjusted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A cutter 1 according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a cutter 1 according to the first embodiment, FIG. 2 is an axial center vertical cross-sectional view of the cutter 1 according to the first embodiment, and FIG. 3 is related to the first embodiment. FIG. 3 is a perspective cutaway perspective view of a tip shaft portion of the cutter 1.

As shown in FIG. 1, the cutter 1 according to the first embodiment has an appearance in which a shaft body 2, a cap 3 attached to the tip of the shaft body 2 and a rear side of the shaft body 2 are provided. The lid portion 5 attached to the end portion, the thin tube portion 4 into which the cutter blade 7 is inserted, and the blade tip adjusting portion 6 for adjusting the blade protruding amount of the cutter blade 7.
It consists of and.

As shown in FIG. 2, the shaft body 2 is hollow, the rear end portion of the shaft body 2 is open, and the front half of the shaft body 2 is provided with the cutting edge adjusting portion 6 for attachment. Step 2
a is provided, and the tip of the shaft body 2 is provided with a cap attachment portion 2b, which is a screw or a thread for attaching the cap 3. The mouthpiece attachment portion 2b is provided with a hole 2c for introducing the cutter blade 7 inserted into the thin tube portion 4 into the shaft body.

Inside the shaft body 2, a magnet 8 is attached as an attraction means. A slide pin 8a for sliding the magnet 8 in the axial direction is attached so as to penetrate the magnet 8, and an opening hole 2d for projecting the tip of the slide pin 8a to the outside of the shaft 2 is provided in the shaft 2. It is provided on the peripheral surface of the step portion 2a. The opening 2d intersects the axial direction so that the magnet 8 can be slid in the axial direction in the shaft 2 when the slide pin 8a is slid in the direction intersecting the axial direction of the shaft. It has a predetermined length in the direction and is made by a hole slightly inclined in either the left or right direction.

The thin tube portion 4 is for inserting a cutter blade 7, and one opening end 4a has a hole 2 of the mouthpiece mounting portion 2b.
It is embedded in the mouthpiece 3 so as to face the magnet 8 via c and the other opening end 4b projects outward from the mouthpiece 3. The base 3 fixes the thin tube portion 4, and is attached to the base attachment portion 2b via screwing means 3a.

The cutting edge adjusting portion 6 is formed in a tubular shape,
A cam groove 6a is provided on the inner wall along the axial direction. The blade edge adjusting portion 6 is rotatably attached to the step portion 2a of the shaft body 2 so that the tip end portion of the slide pin 8a is engaged with the cam groove 6a. And the blade adjustment part 6
Rotation of the slide pin 8a through the cam groove 6a.
To be slid in the axial direction.

A narrow fitting portion 5a for a spare blade is provided on the back surface of the lid portion 5.
Is provided. A narrowing hole 5b for narrowly fitting the replacement blade is provided in the center of the narrowing portion 5a so that the cutter blade 7 can be securely held tightly. Further, the lid 5 is removed, and the apex of the upright replacement blade is used instead of the tweezers so that it can be used when peeling a cut small piece from the mount.

The cutter blade 7 is made of a rod-shaped body having a circular cross section with a diameter substantially the same as or slightly smaller than the inner diameter of the thin tube portion 4, and can be rotated within the inner diameter of the thin tube portion 4. Is configured. The cutter blade 7 is made of a magnetic material, and has a blade portion 7a having a desired blade edge angle at one end and a contact portion 7b for contacting the magnet 8 at the other end. The abutting portion 7b is formed in a conical shape, and the apex of the abutting portion 7b abuts on the magnet 8, so that the cutter blade 7 and the magnet 8 are abutted.
It is configured so that the contact surface with and can be minimized.

In the case of this embodiment, the blade portion 7a has a predetermined blade edge angle proportional to the radius of the cutter blade 7. As a result of an experiment by the inventor, as shown in FIG. 4, the cutting edge angle θ of the cutter blade 7 having good followability with respect to the traveling direction of the shaft body 2 is as follows. It was found that the angle was about 1/2 of the radius of the cutter blade. Further, it has been found that when the cutting edge angle θ of the cutter blade 7 becomes large and the biting width of the cutting edge exceeds the rotation axis of the cutting blade 7, the followability of the cutting blade 7 is impaired. According to the predetermined blade edge angle, the biting width W of the blade edge of the cutter blade 7 is regulated, and the cutter blade 7 having excellent followability can be obtained. Further, according to such a predetermined blade edge angle θ, when cutting out using a ruler or the like, the blade portion does not hit the ruler or the like and the ruler or the like is not damaged.

A calculation formula for calculating a predetermined cutting edge angle is as follows: tan θ = (r / 2) /0.3 mm, θ = arctan
(R / 0.6), where r means the radius of the cutter blade 7, and 0.
3 mm means the cut depth D. According to this formula, the characteristic angle of the cutter blade 7 having a diameter of 0.5 mm, which is frequently used, is 22.6 degrees. Depth of cut D = 0.3 mm
Shows the case where the cutting symmetry is a film having a thickness of 0.2 mm, and the cutting edge angle with respect to the cutting symmetry having a different thickness can be obtained by substituting the values of the cutting depths D and r in the above formula.

The magnet 8 is connected to the shaft 2 through the thin tube portion 4.
The cutter blade 7 inserted therein is attracted by its magnetic force, and is made of a cylindrical ferrite magnet having a diameter substantially the same as the inner diameter of the stepped portion 2a of the shaft body 2. A flat surface portion 8b for attracting the cutter blade 7 of the magnet 8
A ring-shaped recess 8c for increasing the magnetic force is provided in the. The flat portion 8b may be flat or may be spherical and beveled.

Next, a method of using the cutter 1 according to the first embodiment configured as described above will be described. First, according to the thickness of the workpiece (sheet to be cut), the blade portion 7a is moved by the slide pin 8a through the blade tip adjusting portion 6.
Adjust the protruding amount of. Then, the shaft body 2 may be held vertically, and the thin tube portion 4 may be moved horizontally and according to the shape while pressing the thin tube portion 4 against the sheet to be cut. At the beginning of cutting, move the cutter in a light cutting direction and start cutting after the cutting edge faces the cutting direction. In this case, the magnet 8
Since only the apex of the abutting portion 7b of the cutter blade 7 is slightly in contact with the blade edge, the blade tip can be rotated in the cutting direction by simply moving the shaft body 2 in the light cutting direction.

In the case of cutting using a ruler,
The thin tube portion 4 is applied to the end surface of the ruler and held vertically while sliding to cut. The side of the thin tube section 4 has a cutter blade 7
And the edge of the ruler are prevented from contacting each other, and the leading end of the thin tube portion 4 suppresses the sheet from rising and cuts the edge of the sheet in a sharp direction. Even small circles and squares with a minimum diameter of 0.5 mm, which were difficult in the past, can be cut out easily and cleanly.

When a graphic ruler or character ruler for decoration is used, a plurality of graphic characters can be repeatedly cut, so that a plurality of different color sheets can be combined and used for window decoration. Since the cutter can be used without affecting the use of the front and back of the ruler, it is possible to freely cut the inside letters of the window and the outside letters of the window according to the environment. Also, using a small-sized ruler for design seals, replacement of the color surface representation of a cut figure is inevitable. Figure 5 shows an example of this cutting sticker. The replacement blade can be replaced by pulling out the blade portion 7a of the used cutter blade 7 with a slide pin 8a to the extent that it can be gripped with a fingertip, pulling out the blade portion 7a in the axial direction, and then inserting a new cutter blade 7 into the thin tube portion It should be inserted in 4. As described above, in the present invention, since the cutter blade is sucked by the suction means, the replacement blade can be replaced very easily.

FIG. 6 shows a second embodiment of the cutter according to the present invention. The cutter 10 according to the second embodiment is the first
The difference from the cutter 1 of the embodiment is that the ferrite magnet is replaced with a rare earth magnet. Then, the characteristics of the rare earth magnet can be utilized to form the magnet 11 having a relatively small size. The magnet 11 is embedded in a mortar-shaped molded product 12 made of synthetic resin or the like. The cutting edge adjusting portion 13 can be made smaller in accordance with the miniaturization of the magnet, and the molded product 12 can be accommodated in the mounting portion 14a of the mouthpiece 14 as a whole. Can be made compact. Therefore, the shape of the shaft body 15 is not complicated, and the existing shaft body can be used.

7 and 8 show a third embodiment of the cutter according to the present invention. Cutter 2 according to the third embodiment
0 is different from the cutter 1 of the first embodiment in that a writing attachment portion 22 is provided at the rear end portion of the shaft body 21 instead of the lid portion 5. If the core of the ball-point pen is attached to the writing attachment portion 22, the cutting and cutting work becomes more efficient.

In each of the above-mentioned embodiments, the magnet is used as the attraction means, but any technical means capable of attracting the cutter blade may be used.

[0026]

In the cutter according to the present invention, since the cutter blade is attached to the suction means by suction, the cutter blade is attached to the suction means with a slight contact surface of the cutter blade. Adjustment of the blade extension amount of the cutter blade attached in this manner is performed by the blade tip adjusting portion provided on the outer periphery of the shaft body. That is, when the blade tip adjusting portion is rotated in either the left or right direction, the rotation causes the suction means to slide in the axial direction via the cam groove and the slide pin, and the blade protrusion amount of the cutter blade along with the slide. Can be adjusted. Therefore, the blade edge of the cutter blade follows along the moving direction of the shaft body, and it is possible to perform cutting with a single stroke, and even during cutting, the blade tip adjustment unit keeps the blade out while keeping the cutter shaft body gripped. You can adjust the amount.

[Brief description of drawings]

FIG. 1 is a plan view of a cutter according to a first embodiment of the present invention.

FIG. 2 is an axially central sectional view of a cutter according to a first embodiment of the present invention.

FIG. 3 is a cutaway perspective view of a tip shaft portion of a cutter according to a first embodiment of the present invention.

FIG. 4 is an explanatory view illustrating a blade edge angle of a blade portion of a cutter according to the present invention.

FIG. 5 is an example of a work of a cutting seal using the cutter according to the present invention.

FIG. 6 is a cross-sectional view of essential parts showing a cutter according to a second embodiment of the present invention.

FIG. 7 is a plan view showing a cutter according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of an essential part of a cutter according to a third embodiment of the present invention.

FIG. 9 is a cross-sectional view of an essential part showing a conventional cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter 2 Shaft 3 Base 4 Capillary tube 8 Magnet as adsorption means 7 Cutter blade

Claims (1)

[Scope of utility model registration request] 1. A hollow shaft body, a suction means arranged in the shaft body, for suctioning one end of a cutter blade, and a suction means attached to the suction means so as to intersect in the axial direction of the shaft body. And a slide pin, an opening hole through which the tip of the slide pin projects outside the shaft body, and a projection hole protruding from the opening hole so that the suction means can slide in the axial direction of the shaft body through the slide pin. A cutter provided with a cam groove for engaging a tip of the slide pin on an inner wall, and a cutting edge adjusting portion coaxially attached to an outer periphery of the shaft body.