JP3467242B2 - Assembling case sheet, folding line cutting blade die, and sheet material forming and punching device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet for an assembly case, a blade die for cutting a bending line, and a sheet-shaped material forming / punching apparatus.

[0002]

2. Description of the Related Art Conventionally, a sheet for an assembly case using a sheet material having a thickness of 0.1 to about 0.5 mm and made of a thermoplastic resin such as polyvinyl chloride, polystyrene, ABS resin, polypropylene, etc. In general, the folding line is formed by pressing a single line to the inside of the fold, stamping it out, and then assembling it to form a desired case.

[0003]

However, as in the above-mentioned conventional example, when the bending line has one streak shape,
For example, as shown in FIG. 7, a corner (also referred to as a projected corner) bent at 90 ° exhibits a sharp state, and at the same time, the appearance of the case is impaired due to the influence of distortion due to a so-called springback phenomenon. is there.

The present invention has been made by paying attention to the above-mentioned point, and the bending line is a bottomed hole in which a minute rectangular concave cut is formed and two broken lines in which a fixed minute interval is alternately provided. It is formed in different rows, and the shape of the corners of the fold is chamfered and has a gentle touch. An object of the present invention is to provide a sheet for an assembly case, a blade die for cutting a bending line, and a sheet-shaped material forming punching device.

[0005]

The present invention can solve the above-mentioned problems by providing the following constitutions.

(1) A sheet for an assembly case, which is assembled by folding along a folding line, wherein the folding line is formed by forming broken lines in two parallel rows, and the broken lines are bottomed with minute rectangular concave cuts. A sheet for an assembly case, characterized in that it has a structure in which holes and a certain minute interval are alternately provided.

(2) A blade type for engraving two rectangular rows of minute rectangular concave cuts parallel to the inner side of the fold line of the assembly case sheet by pressing in a broken line shape at regular minute intervals. , An upright thin plate-shaped flat plate is formed with double-edged blades having an inverted V-shaped cross section along the ridgeline, and the tip of this blade forms a ridge and a valley that form ridges and valleys at minute intervals. A fold line cutting blade die characterized in that the cutout portions are alternately provided at regular intervals, and a large number of blades having a broken line shape are opposed to each other to form two rows.

(3) A sheet-shaped material forming punching device comprising an upper die and a lower die, and the folding line cutting blade die described in (2) above, wherein the upper die is assembled on the lower surface of a flat plate. The cutting blade for cutting the contour of the case sheet is cut at a predetermined position with the tip of the cutting blade facing downward, and at the predetermined position where the cutting blade is engaged with the bending line when bending, and the cutting blade tip for cutting the bending line is cut. A rubber-like elastic body is suspended vertically in the flat plate lower surface space area surrounded by the cutting blade and the cutting blade die so as to be located slightly above the blade, and the hardness of the rubber-like elastic body is suspended. Depending on the virtual horizontal plane formed by the tip of the cutting blade die, or the virtual horizontal plane formed by the tip of the cutting blade as a reference plane, the degree of downward bulging of the lower surface of the rubber-like elastic body Adjust and position, lower mold It is composed of a flat plate on which a sheet-shaped material is placed, and a sheet-shaped material having a predetermined thickness is placed on the upper die and moved into the lower engaging position of the upper die to move up and down to cut a contour, cut a fold line, and die. A sheet-shaped material forming and punching device characterized in that it is configured such that punching and other operations can be performed almost simultaneously.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.

FIG. 1 (a) is a plane development view of an embodiment of a seat for an assembly case according to the present invention, FIG. 1 (b) is an enlarged view of a fold line A, and FIG. 1 (c) is a sectional view of a seat.
2D is a sectional view of the seat taken along the line BB in FIG. 2A.
Is a perspective view of a bending line cutting blade die according to the present invention,
(B) is a front view and a side view of a folding line cutting blade die according to the present invention, (c) is a C-C cross section, and (d) is a D-.
D cross section, FIG. 3 is a partially enlarged explanatory view of a folding line cutting blade die, FIG. 4 is a partially enlarged perspective view of the folding line cutting blade die, and FIG. 5 is a sheet-shaped material forming punching device according to the present invention. FIG. 6 is a schematic side view, FIG. 6 is an enlarged view of a corner portion by a bending line (two parallel broken lines) according to the present invention, FIG. 7 is an enlarged view of a corner portion by a conventional bending line (single streak), and FIG. It is an example of another blade type (an example in which the outside of the blade tip is also tapered).

A description will be given below with reference to the drawings.

First, as the invention of claim 1, in FIG. 1, (a) is a plan development view of the assembly case sheet of the present embodiment after die cutting, in which a bending line A is a minute broken line. However, as shown in the partial enlarged view of the bending line A, the bottomed holes in which the minute rectangular concave cuts 1 are formed are alternately arranged at a constant minute distance di in FIG. A row of books is formed, and the row width spacing dimension W is also appropriately set to a minute spacing dimension, and as shown in the sheet cross sections of (c) and (d), a minute rectangular concave cut 1 to be the folding line A is formed on the sheet Sh. It is provided as a bottomed hole and is engraved by pressing it with a blade die 2 forming two inverted V-shaped blades at positions having a row width interval dimension W in a cross section orthogonal to the row as shown by the arrow BB. In the present embodiment, a so-called film-like sheet Sh having a thickness of 0.2 mm is used, a column width interval dimension W determined by the thickness of the blade die 2 is 0.7 mm, and a minute rectangular concave shape forming a bending line is used. The bottomed hole in which the notch 1 is formed and the minute gap di both have a trapezoidal vertical cross section of 0.5 mm.

The depth of the minute rectangular concave cut 1 is determined by the depth dp of the notch portion of the blade die 2 described later, and is about 1/2 of the thickness of the sheet Sh. In this embodiment, it is 0.1 mm. And

Secondly, as the invention of claim 2, FIG.
As shown in (a), (b), (c), (d) and FIG. 3, the blade die 2 for pressing the folding line A for engraving is parallel to the inner side of the fold of the assembly case sheet. The small rectangular concave cuts 1 forming two rows are set at a constant small distance di.
So that it can be engraved by pressing in a broken line with, a double-edged blade with an inverted V-shaped cross section is formed along the ridgeline at the lower edge of an upright thin plate-like flat plate, and at the tip of this blade, ridges and valleys at minute intervals di. To form a ridge and a notch 2 to form a valley.
b are alternately provided at regular intervals, and a large number of blade portions 2a having a broken line shape face each other to form two rows.

As shown in the section D-D of (d), the cutout portion 2b has a depth dp that is ½ of the thickness of the target sheet Sh from the tip of the blade portion 2a, and is bent. When the line A is pressed by the blade die 2 and engraved, the surface of the cutout portion 2b is brought into contact with the upper surface of the sheet Sh and stopped so as not to be cut. .

Thirdly, as an invention of claim 3, as shown in FIG. 5, the sheet material blanking and punching apparatus is composed of an upper die and a lower die, and the upper die BU is a sheet for a case assembled on the lower surface of a flat plate. Bending line cutting blade die 2 according to the present invention at a predetermined position where the cutting blade 3 for cutting the contour of The tip of each of them is hung downward so as to be located slightly above the cutting blade 3, and a rubber-like elastic body 4 is suspended in the flat plate lower surface space area surrounded by the cutting blade 3 and the cutting blade die 2. Then, depending on the hardness of the rubber-like elastic body 4, the rubber-like elastic body is based on a virtual horizontal plane formed by the tip of the cutting blade die 2 or a virtual horizontal plane formed by the tip of the cutting blade 3. Adjust the degree of downward swelling of the lower surface of 4 The lower die BL is made of a flat plate on which the sheet material Sh is placed, and the sheet material Sh having a predetermined thickness is placed on the lower die BL to enter the lower engaging position of the upper die BU and move up and down. The contour cutting, the cutting of the bending line A, and the die cutting can be performed almost simultaneously.

The operation will be described with reference to the above configuration and the drawings.

In FIG. 5, the sheet-shaped material S is placed on the flat plate of the lower mold BL of the sheet-shaped material forming / punching apparatus according to the present invention.
a cutting blade 3 for cutting the contour of the assembly case sheet on which h is placed, a folding line cutting blade die 2 according to the present invention which is vertically hung downward so as to be located in a slightly upper stage, and the cutting blade As shown in FIG. 5, a predetermined lateral direction is entered by engaging with each of the parts formed by suspending the rubber-like elastic body 4 in the space area of the lower surface of the flat plate of the upper mold surrounded by 3 and 3. When the sheet-shaped material Sh is stopped, the sheet-shaped material Sh is pushed up by an elevating means (not shown) while the sheet-shaped material Sh is placed, and the upper surface of the sheet-shaped material Sh comes into contact with the tip of the cutting blade 3 almost at the same time. The lower surface of the elastic body 4 is also brought into contact, and subsequently the cutting blade die 2 is brought into contact to perform desired contour cutting of the assembly case sheet and cutting and engraving of the folding line A,
Next, the flat plate of the lower die BL is pushed down by the not-shown elevating means, the die cutting operation is performed, and the series of steps is completed.

As shown in FIG. 6, there is no springback phenomenon at the corners of the product after completion of the assembly of the assembly case sheet completed by using the above means according to the present invention.
Since the corners are chamfered, it is possible to provide a product which has a gentle touch and at the same time has excellent retention without impairing the aesthetic appearance of the case.

In the present embodiment, the cross-sectional shape of the blade die is inverted V
Although the blade is formed in a V shape and the outer side of the blade is formed by a vertical surface, as shown in FIG. 8, the outer surface of the inverted V shape may be tapered on both sides.

Further, the sheet-shaped material is mainly effective for plastics such as thermoplastic resins, but the kind of the material is not limited.

Further, a film-like sheet used for a cover of a spread part such as a notebook, and other plastic
Of course, it can be applied to folds of sheets.

[0023]

According to the present invention, the bending line is formed by forming the bottomed hole in which a minute rectangular concave cut is formed and the broken line in which a constant minute interval is alternately provided in two parallel rows. As a result, the shape of the corners of the fold is chamfered and has a gentle feel, eliminating the springback phenomenon during folding and assembling. It is possible to provide a blade die for cutting a bending line, and a sheet-shaped material forming punching device.

[Brief description of drawings]

1A is a plane development view of an embodiment of a seat for an assembly case according to the present invention, FIG. 1B is a partially enlarged view of a folding line A, FIG. 1C is a sectional view of a seat, and FIG.
Is the BB arrow of the seat cross-sectional explanatory view

FIG. 2 (a) is a perspective view of a folding line cutting blade die according to the present invention, (b) is a front and side view of the folding line cutting blade die according to the present invention, and (c) is C -C cross section, (d) is DD cross section

FIG. 3 is a partially enlarged explanatory view of a folding line cutting blade die.

FIG. 4 is a partially enlarged perspective view of a folding line cutting blade die.

FIG. 5 is a schematic side view of the sheet material forming punching device according to the present invention.

FIG. 6 Fold lines according to the invention (two parallel dashed lines)
Enlarged view of the corner by

FIG. 7 is an enlarged view of a corner portion of a conventional bending line (one streak).

FIG. 8 Example of another blade type (example in which the outside of the blade tip is also tapered)

[Explanation of symbols]

1 Micro rectangular concave cut (bottomed hole) 2-flute type 2a blade 2b Notch 3 cutting blades 4 Rubber-like elastic body A fold line di minute interval dp Notch depth BU upper mold BL lower mold Sh sheet material W column width spacing dimension

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Claims (3)

(57) [Claims] 1. A sheet for an assembly case, which is assembled by folding at a folding line, wherein the folding line forms a broken line in two parallel rows, and the broken line has a bottomed hole in which a minute rectangular concave cut is made. And a sheet for an assembly case, which is configured such that a predetermined minute interval is alternately provided. 2. A blade type for engraving two rectangular rows of minute rectangular concave cuts parallel to the inner side of the fold line of the assembly case sheet by pressing in a broken line shape at regular minute intervals, Double blades with an inverted V-shaped cross section are formed along the ridgeline at the lower edge of an upright thin plate, and the tip of this blade forms a ridge and a valley that form ridges and valleys at minute intervals. A fold line cutting blade die characterized in that notch portions are alternately provided at regular intervals, and a large number of blades having a broken line shape are opposed to each other to form two rows. 3. A sheet-shaped material forming / punching apparatus comprising an upper die and a lower die, and the folding line cutting blade die according to claim 2, wherein the upper die is a sheet for a case assembled on a lower surface of a flat plate. The tip of the cutting blade for cutting the contour of the cutting blade downward at a predetermined position, and the tip of the folding line cutting blade die at a predetermined position that engages with the folding line when folding is slightly more than the cutting blade. The rubber-like elastic body is suspended vertically in the flat plate lower surface space area surrounded by the cutting blade and the cutting blade die so as to be positioned downward in the upper stage, and the rubber-like elastic body is hardened depending on the hardness of the rubber-like elastic body. Adjusting the degree of downward bulging of the position of the lower surface of the rubber-like elastic body with the virtual horizontal surface formed by the tip of the cutting blade die or the virtual horizontal surface formed by the tip of the cutting blade as a reference surface. Position and lower die is sheet-shaped It consists of a flat plate for placing the material,
By placing the sheet material of predetermined thickness and vertical movement enters the lower engagement position of the upper mold and outline cut, cut fold lines, and, almost simultaneously operated process configured to enable demolding like, the , The fold line is a broken line formed in two parallel rows
However, the broken lines face each other and are cut into small rectangular concave shapes.
A structure in which a bottomed hole with a recess and a fixed small interval are alternately provided.
Completed so that the assembled case sheet can be obtained
Sheet material forming punching device, characterized in that that.