JPS608958Y2 - circle cutter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circular cutter for cutting a part of a flat material such as paper, vinyl sheet, carpet, etc. into a circular shape.

Conventionally, this type of circular cutter uses a needle-like core that is pierced into the object to be cut so as to center the cutter.
Using the needle type disclosed in No. 53-2309, No. 53-24590, etc., and a core body equipped with a relatively wide seat plate, this is pressed against the object to be cut to center it. For example, a needleless type disclosed in Japanese Utility Model Application Publication No. 52-13628 is known.

However, with the needle type, although the center can be determined, needle marks are left on the object to be cut, and while it is fine if something other than the inner part is needed, needle marks remain if the inner part itself is required, which is a problem. Met.

On the other hand, the needleless type, contrary to the needle type, does not leave needle marks on the object to be cut, but it is difficult to determine the center.

In particular, in the device disclosed in Japanese Utility Model Application No. 52-13628, the seat plate is swingably connected to the core body by a ball joint, so that the pressing force of the core body is applied to the seat plate appropriately. It was difficult for the seat plate to slide over the object to be cut.

The present invention was devised in order to solve the above problems, and its purpose is to prevent needle marks from being left on the object to be cut after cutting, and to To provide a circle cutter capable of determining the center during cutting.

The circular cutter of the present invention has a main body that is rotatable when placed on the object to be cut, and has a lower surface with a wide area that can come into contact with the object to be cut, and an outer peripheral surface that can be gripped with one hand. A hollow first core body is provided to be able to rotate and move up and down approximately in the center shaft, and a hollow first core body is provided at its lower part with a seat surface having a relatively wide area that presses against the object to be cut, and the upper part is provided with a first core body that is rotatable and movable up and down. A pressing part that is pressed down by hand is provided with an armor part at the bottom that can pierce the object to be cut, and is movable in the radial direction with respect to the second core body which is screwed into the first core body so as to be able to move up and down, and the main body. It is characterized in that it is composed of a sliding body that can be fixed at an appropriate position, and a blade that is installed on the sliding body and cuts the object to be cut.

Embodiments of the present invention will be described below based on the drawings.

The main parts of the circular cutter 10 include a main body 12, a core body 14, a blade body 16, and a sliding body 18.

The main body 12 includes an annular flat plate part 20 with a wide lower surface that can come into contact with the object to be cut 200, and an outer peripheral surface that protrudes upward near the inner periphery and can be gripped with one hand. It includes a cylindrical portion 22, an appropriate number of ribs 24 provided along the diameter of the annular flat plate portion 20, and a boss 26 provided at the center thereof, that is, at the center portion of the main body 12.

The cylindrical part 22 has a notch 32 formed in its front part and a through hole 3 in its rear part so as not to hinder the movement of the sliding body 18 in the radial direction.
4 is bored, and a large number of protrusions and recesses 36 are formed on the outer peripheral surface to prevent slipping.

One of the ribs 24 serves as a guide rail 28 for the slide 18, which consists of two laterally spaced symmetrical stepped ridges 30.

A male screw 38 is carved on the upper outer periphery of the boss 26.

Each part of the main body 12 is integrally molded from a synthetic resin material or the like.

The sliding body 18 is provided to vary the distance between the core body 14 and the blade body 16, that is, the radius, and is slidably provided on the guide rail 2B formed in the main body 12. .

The sliding body 18 is connected to both stepped protrusions 30 of the guide rail 28.
Its cross-sectional shape is an inverted U-shape in order to be supported and guided astride the upper wall, and a long hole 40 is bored in the longitudinal direction of the upper wall, thereby preventing the sliding body 18 from moving beyond a predetermined value. be done.

In other words, the sliding body 18 is configured so as to be prevented from coming off the guide rail 28 by being restricted by the boss 26 of the main body 12, and the sliding body 18 can move by the length of the elongated hole 40.

The sliding body 18 is configured so that it can be locked at an appropriate position within a range in which it can move relative to the guide rail 28.

This locking mechanism is composed of a male screw 38 of the boss 26, a nut 42 screwed onto the male screw 38, and a washer 44 interposed between the sliding body 18 and the nut 42.

The sliding body 18 is made of a metal plate or the like, and the blade 16 is attached to the front part of the sliding body 18.

That is, a hanging piece 46 is formed on the front part of the sliding body 18, and a blade receiving plate 48 having a substantially U-shape in plan is applied to this piece.

At this time, the hanging piece 46 is positioned within the groove of the blade receiving plate 48, and both flanges 50 are made to protrude rearward from the hanging piece 46.

Through holes 52 and 54 are formed in the hanging piece 46 and the blade receiving plate 48, respectively, and a bolt 56 is inserted through these, and a tightening nut 58 is screwed into the threaded portion of the bolt 56.

Then, a part of the disk-shaped head 60 of the bolt 56 is cut out, and this cut out part 62 is attached to one flange part of the blade receiving plate 48.
This is what is called a rotation stopper.

Further, a snap ring 64 is fitted into a groove formed at the boundary between the non-threaded portion and the threaded portion of the bolt 56, so that the bolt 56 is configured to not separate from the hanging piece 46 and the blade receiving plate 48. be.

The blade body 16 is inserted between the head 60 of the bolt 56 and the hanging piece 46, and is fixed by screwing the tightening nut 58.

The blade body 16 is usually in the shape of a parallelogram, with a blade 66 formed on one short side, and a protective tube 68 fitted around the upper body for safety during handling. It is.

The amount of downward protrusion of the blade 16, that is, the depth of cut, is determined by the operator as desired depending on the thickness of the object 200 to be cut.

A pocket 70 is provided in a part of the main body 12 to store a replacement blade 16 and other accessories.

This utilizes the unused space of the guide rail 28 and includes a lid 72 that can be opened and closed.

The lid 72 opens and closes at a fold line 74, and a hook 76 is formed at the end thereof, and a hook 78 into which this is fitted is provided on the main body 12 side.

The sliding body 18 is marked with a scale 80, and the rib 24 of the main body 12 is marked with a reference point 82 indicating the center position, so that the distance between the core body 14 and the blade body 16 can be visually observed. .

In this example, the diameter that can be cut is displayed, but the radius may also be displayed.

Further, the scale 80 can be set as the reference point and the middle 82 can be provided in the opposite direction to that described above.

The core body 14 is separated from a first core body 98 and a second core body 102, and the inside of the first core body 98 is hollow.

Specifically, the shaft portion 88 and the seating portion 90 are cut and shaped from a metal rod or the like, and the inside thereof is hollow, and a female screw 108 is carved in the lower half.

The seating portion 90 has a recess 96 into which a ring-shaped friction body 94 having a hole in the center is fitted.

The shaft portion 88 of the first core body 98 is connected to the support hole 99 of the boss 26.
After the shaft part 88 is loosely fitted, a stopper 110 such as a vinyl tube is fitted to the upper part of the shaft part 88.

The second core body 102 includes a pressing part 86 on the upper part, and
A male portion 100 is formed at the bottom of the shaft 112, and a female screw 114 that fits the female screw 108 is screwed onto the shaft 112.

The pressing portion 86 is made of synthetic resin or the like and is molded, particularly integrally, with the metal shaft 112, or the two are then fitted together irreleasably.

Furthermore, the seating body 10 is larger than the seating portion 90 of the first core body 98.
6 will be installed as necessary.

The seating body 106 is also provided with a feeling 116, and a friction body 1 is attached to this.
18 is fitted.

For attachment to the first core body 98, a female screw 108 is used.For this purpose, a male screw portion 120 is formed on the body 106, and a male screw portion 120 is formed on the friction body 94 of the seating portion 90. A hole is provided so that the portion 120 does not interfere.

A receiving hole 122 that opens upward is provided inside the male screw portion 120 of the seating body 106, and the male portion 100 of the second core body 102 is brought into contact with this receiving hole 122, so that the so-called first core body 98
This is to prevent the second core body 102 from inadvertently screwing against the second core body 102.

Next, actions are layered based on such a configuration.

First, the nut 42 is loosened, the sliding body 18 is moved to a desired radial position, and the nut 42 is screwed again to fix it.

At this time, the radius or diameter is set using the scale 80 and the base point interval 82.

Next, loosen the tightening nut 58 to set the lower part of the blade 16 to an amount that corresponds to the object to be cut 200, and then tighten the tightening nut 58 again.
to fix it to the sliding body 18 side.

If the inner part itself is necessary and the desired circle is large, leave the seat 106 attached as shown in FIG.
If the desired circle is small, for example, the blade 16 is
6, the seating body 106 is removed as shown in FIG.

On the other hand, if the remaining part other than the inner part is required, the second core body 102 is screwed down onto the first core body 98 and the male part 1
00 at the bottom as shown in FIG.

Moreover, if it is desired to adjust the amount of piercing of the male part 100 of the second core body 102, the position of the seating part 90 of the first core body 98 is appropriately determined as shown in FIG. 12, and the two are used together.

When the above preparations are completed, place the circular cutter 10 at the location where the object to be cut 200 is to be cut, press the pressing part 86 downward with your finger, and remove any one of the seating body 106, the seating part 90, the male part 100, or The seating part 90 and the male part 100 are used together to forcefully contact the center part of the object to be cut 200.

Due to this pressing operation, the circular cutter 10
This means that you have gained a pivot.

Next, grasp the outer peripheral surface of the cylindrical portion 22 of the main body 12 and remove the core 1.
The main body 12 is rotated with 4 in the air.

At this time, it does not trip over the unevenness 36. The pressing part 86 is
While pressing with one hand, the main body 12 is gripped with the other hand.

When the main body 12 is rotated, the blade 66 of the blade 16 fixed to the main body 12 via the sliding member 18 cuts a circular shape on a part of the object.

Since the core body 14 is configured to be able to move up and down relative to the main body 12, the lower surface of the body 12 can always be brought into close contact with the upper surface of the object to be cut 200, and the core body 14 and the blade body 16
The blade is always in a vertical position and can be cut uniformly without unevenness.

As described above, according to the present invention, the following excellent effects can be achieved.

(1) When a part other than the inner part is required, the male part of the second core is used, and when the inner part itself is required, the seating part of the first core is used, so the necessary No needle marks are left on the object to be cut.

(2) If a part other than the inner part is required, the male part of the second core is used, so the center can be determined when cutting.

If the inner part itself is required, the seating part of the first core is used, but the first core is provided so that it can pivot and move up and down relative to the main body, and the second core is screwed onto it. The pressing force of the second core body is accurately transmitted to the seating portion, and the center during cutting can be more accurately determined than in the conventional needleless type.

As a result, no matter which core is used, the center can be determined, the cutting operation can be easily performed, and highly accurate circular cutting can be performed.

(3) Since the first core body and the second core body are provided coaxially,
These can be used together.

In this case, the amount of penetration of the male part of the second core is adjusted depending on the seating part of the first core, and the seating part of the first core is prevented from sliding depending on the male part of the second core. Therefore, no large needle marks are left, and stable cutting can be performed, especially when cutting out large circles.

(4) Since the structure is relatively simple, it can be made inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the overall aspect of a circular cutter according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view taken along the line ■-■ of Fig. 1, Fig. 3 is a bottom view, and Fig. 4 is a right side view. Top view, Figure 5 is a left side view showing the state in which the core is lowered, Figure 6 is the Vl of Figure 1.
- VI line enlarged longitudinal front view, Fig. 7 is a vertical enlarged front view taken along the ■-■ line in Fig. 1, Fig. 8 is an enlarged side view taken along the -■ arrow direction in Fig. 1, and Fig. 9 is a bottom view of main parts. , Fig. 10 is an enlarged front view of the main part when the seating part of the first core body is used, Fig. 11 is a similar view when the second core body is used, and Fig. 12 is the seating part of the first core body. It is a similar view when a second core body is used. 10 is a circular cutter, 12 is a main body, 14 is a core body,
16 is a blade, 18 is a sliding body, and 200 is an object to be cut.

Claims (1)

[Scope of utility model registration request] The main body has a wide lower surface that can come into contact with the object to be cut and an outer peripheral surface that can be gripped with one hand, and can be placed on the object to be cut and rotated. A hollow first core body that can be freely installed and has a relatively wide seating surface at the bottom that presses against the object to be cut, and a pressing part at the top that is pressed down with the other hand at the bottom. A second core body is provided with an armor portion that can pierce the object to be cut and is screwed into the first core body so as to be able to move up and down, and a sliding member that can be moved in the radial direction with respect to the main body and can be fixed at an appropriate position. A circular cutter characterized by comprising a moving body and a blade body provided on the sliding body to cut an object to be cut.