JP2004122329A - Document stitching filing device, punch device, and document stitching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a document stitching device, a punch device and a document stitching method capable of easily stitching document by contributing to energy saving. <P>SOLUTION: It is possible to easily stitch a plurality of the accumulated documents by folding back a filing piece 48 formed of a second blade member on the front surface side of the documents through a hole 45 drilled by a first blade member from the back surface side of the documents. As a result of being able to stitch the documents in such a way and eliminating use of a metal needle, it is possible to contribute to the energy saving. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a document binding device, a punch device, and a document binding method for binding a plurality of stacked documents and the like.
[0002]
[Prior art]
A stapler is the most typical means for binding documents. Staplers are very convenient because anyone can easily bind documents and are widely used in homes and offices.
[0003]
[Problems to be solved by the invention]
However, in today's environment-conscious society, the consumption of energy and resources for manufacturing such metal needles is problematic. In addition, the needle must be removed for sorting and collecting documents at the time of disposal, which is very troublesome. Further, when a stapled document is separated for copying, for example, it is necessary to remove the staples and bind them again with new staples, which wastes energy and resources.
[0004]
In order to solve such a problem, an instrument for binding documents without using a metal needle or the like is available on the market. However, these devices on the market have a very weak binding force for the document binding, for example, the number of binding documents is limited to about four, and can be used only for limited applications. Further, there is paper binding using a paper tape or the like. However, considering the environment, the use of a new material for binding is a problem in itself.
[0005]
In view of the circumstances described above, an object of the present invention is to provide a document binding device, a punch device, and a document binding method that contribute to energy saving and can easily bind a document.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a document binding device according to the present invention includes a first blade member that drills a hole penetrating from the front side to the back side of a plurality of stacked documents, and a position facing the hole. By forming a slit that penetrates from the front side to the back side of the document, a portion surrounded by the slit has a binding piece having at least a portion larger than the width of the hole in a direction substantially orthogonal to the facing direction. A second blade member to be formed; and a connecting member for connecting the first blade member and the second blade member at a predetermined interval.
[0007]
In the present invention, for example, a plurality of stacked documents are folded by folding a binding piece formed by the second blade member from the back side of the document to the front side through a hole formed by the first blade member. It can be easily bound. As a result of such binding, it is not necessary to use a metal needle, which contributes to energy saving. In addition, the present invention is free from the troublesome needle removal operation for sorting when discarding documents, which has been conventionally performed. Here, the folding of the binding pieces can be performed by using a human hand, or can be automatically performed by incorporating the folding means into the document binding apparatus.
[0008]
Further, the binding piece in the present invention has at least a portion larger than the width of the hole in a direction substantially orthogonal to the facing direction. Therefore, for example, by folding the binding piece from the back surface side to the front side through the hole, it can be securely engaged with the hole and a strong fastening force can be generated.
[0009]
Further, in the present invention, since the first blade member and the second blade member are connected at a predetermined interval, for example, a binding piece formed by the second blade member and the first blade member are punched by the first blade member. The gap with the provided hole is fixed at a predetermined gap. Thereby, for example, it is possible to prevent the binding piece from being unable to pass through the hole.
[0010]
In one embodiment of the present invention, the second blade member has means for projecting the formed binding piece substantially perpendicular to the surface of the document, and the folding means includes a surface side of the projected binding piece. And a pressing member that is turned back to the front side through the hole by pressing the pressing member. Thereby, the binding piece can be automatically turned back and passed through the hole as described above, which is convenient.
[0011]
A document binding device according to another aspect of the present invention forms a first slit penetrating from the front side to the back side of a plurality of stacked documents, thereby forming a first slit surrounded by the first slit. By forming a first blade member forming a part and a second slit penetrating from the front side to the back side of the document at a position facing the first part, the document is surrounded by the second slit. A second blade member forming a binding piece having at least a portion larger than the width of the first portion in a direction substantially orthogonal to the opposite direction, the first blade member, and a second blade. And a connecting member for connecting the member with a predetermined interval.
[0012]
In the present invention, for example, by folding a binding piece from the back side of the document to the front side through the first slit, it is possible to easily bind a plurality of stacked documents, and it is not necessary to use a metal needle. Contribute to energy saving. Further, by forming the first slit, the document can be easily bound. That is, by forming a slit-shaped hole so as to form the first portion, the binding piece can be smoothly folded back due to the elasticity of the paper possessed by the first portion. The fastening force between the papers can be increased. The shape of the first slit can be, for example, a U-shape.
[0013]
A punch device according to the present invention includes a first blade member for forming a first hole penetrating from a front side to a back side of a plurality of stacked documents, and a front side of the documents at a position facing the holes. By forming a slit penetrating from the back side to the second side, a portion surrounded by the slit forms a binding piece having at least a portion larger than the width of the hole in a direction substantially orthogonal to the facing direction. A blade member, and a connecting member for connecting the first blade member and the second blade member at a first interval, and connecting the first blade member and the second blade member. The two connecting members are provided at a second interval.
[0014]
In the present invention, the first blade member, the second blade member, and the connecting member are set as one set, and two sets are provided at a second interval. Thereby, for example, by folding back the binding piece from the back side of the document to the front side through the first hole, a plurality of documents can be easily bound, and the shape surrounded by the slits in the document. In this case, two second holes can be formed. Documents can be bound to a commercially available file through the two formed second holes, for example, through a rod-shaped or ring-shaped binding member provided on the commercially available file. As a result, after the documents are bound with the binding pieces, the punching work is not required when the documents are stored in a commercially available file, which is very convenient.
[0015]
When storing bound documents in a commercially available file, the documents are concluded in units of the specified number of bound sheets (or the specified number of perforated sheets). This is very convenient because it can be handled in units of bound documents (or perforated documents) when taken out. As described above, it is very effective to simply use as a punch instead of binding the documents.
[0016]
In the present invention, the means for forming the second hole includes, for example, forming the second hole in the document by projecting the binding piece substantially perpendicular to the surface of the document at a part of the second blade member. Can be. Further, the means for forming the second hole may include a pressing member which presses the surface side of the protruded binding piece to turn the surface of the document through the first hole. With such a configuration, document binding can also be performed using only the punch device according to the present invention.
[0017]
The document binding method according to the present invention includes: (a) a step of forming a hole penetrating from the front side to the back side of a plurality of stacked documents; and (b) a front side of the document at a position facing the hole. Forming a slit that penetrates from the back surface side to a step of forming a binding piece having at least a portion that is larger than the width of the hole in a direction substantially orthogonal to the opposite direction, by enclosing the slit. Have. Alternatively, the document binding method according to another aspect of the present invention includes the steps of: (a) forming a first slit penetrating from the front side to the back side of a plurality of stacked documents so that the first slit is surrounded by the first slit; (B) forming a second slit that penetrates from the front side to the back side of the document at a position facing the first section; Forming a binding piece in which the portion surrounded by the slit has at least a portion larger than the width of the first portion in a direction substantially orthogonal to the opposite direction.
[0018]
According to the present invention, a plurality of stacked documents can be easily bound, and it is not necessary to use a metal needle, which contributes to energy saving. Further, the order of the step (a) and the step (b) may be performed simultaneously, regardless of the order.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a partial sectional view of a document binding device according to an embodiment of the present invention. FIG. 2 is a perspective view showing the first blade member 20 and the second blade member 30 shown in FIG.
[0021]
Referring to FIG. 1, a lever 16 is provided at the uppermost portion of the document binding device 1 for a person to press and operate with a hand or the like. Below the lever 16, there is provided a movable portion 33 which can move up and down integrally.
[0022]
The movable portion 33 includes an upper support plate 3 provided at an upper portion and connected to the lever 16 via a bolt 17, a support member 2 fixed to the upper support plate 3 and supporting the same from below, 2, blade members 20 and 30 attached to the lower surface of the lower support plate 9 via a connecting member 21, and fixed on the side surfaces of the upper support plate 3 and the lower support plate 9. Further, it has a substantially rectangular parallelepiped cylindrical body 10 and a cam base 31 described later attached to a side surface of the cylindrical body 10. That is, the movable portion 33 is configured such that the upper support plate 3, the support member 2, the lower support plate 9, the blade members 20 and 30, the cylindrical body 10, and the cam base 31 are integrally movable.
[0023]
Inside the cylindrical body 10, for example, a fixing plate 11 for bottom dead center is fixed to a support (not shown). The support is coupled to a base block 4 provided at the lowermost portion, and the entire document binding apparatus 1 is supported by the base block 4 and the support. The fixed plate 11 is a plate for restricting the movement of the movable portion 33 below by contacting the upper support plate 3 that has moved when the movable portion 33 moves downward.
[0024]
Similarly, a fixing plate 12 for top dead center is fixed to a support (not shown) inside the cylindrical body 10. As described later, when the movable portion 33 moves upward due to the return force of the compression spring S1, the fixed plate 12 comes into contact with the lower support plate 9 that has moved, thereby moving the movable portion 33 upward. This is a plate for restricting movement.
[0025]
Further, below the fixed plate 11, for example, a retaining ring 19 is fixed to the support member 2, and a washer 22 is inserted thereunder, and a compression spring S1 is interposed between the retaining ring 19 and the fixed plate 12 therebelow. The lower end of the compression spring S1 is fixed to the fixed plate 12 via, for example, a washer (not shown). For example, holes 11a and 12a are formed in these plates 11 and 12, respectively, and the support member 2 is movably inserted into the holes 11a and 12a.
[0026]
Further, as described above, the cam base 31 is attached to the outer surface of the cylindrical body 10, and the rollers 32 rotate on the cam base 31 to move. The roller 32 is connected to, for example, the pin 15 attached to the cylindrical body 10 via the spring member 18. The roller 32 is always urged in the direction of the pin 15 by the spring member 18.
[0027]
The connection lever 5 rotatably supports the roller 32, and rotates around a fixed shaft 25 provided at an upper end. An elongated pressing member 27 that rotates with respect to the connecting lever 5 about the shaft portion 24 is connected to a lower end of the connecting lever 5. The pressing member 27 is in a state where the distal end of the pressing member 27 is constantly urged upward by an elastic member 26 using a wire or the like wound around the shaft portion 24.
[0028]
A hole 9a is formed in the lower support plate 9, and, for example, four shafts 8 are inserted in the hole 9a so as to be vertically movable. An upper plate 13 for clamping documents is fixed to lower ends of the shafts 8, and a lower plate 14 on which documents are placed is arranged below the upper plate 13. The upper plate 13 has openings 13a and 13b through which the blade members 20 and 30 penetrate. The shaft 8 is provided with a spring S2 and a spring S3, and the spring S2 is disposed inside the spring S3. The lower support plate 9 approaches the upper plate 13 against the spring force of these springs S2 and S3.
[0029]
For example, four shafts 7 are fixed to the lower surface of the lower plate 14, and these shafts 7 are vertically movably inserted into holes 4 a provided on the upper surface of the base block 4. The shaft 7 is provided with a spring S4, and the lower plate 14 moves downward against the spring force of the spring S4.
[0030]
Here, the relationship between the spring constants of the springs S2, S3, and S4 is such that the springs S2 <S4 <S3.
[0031]
In addition, dies 40 and 50 are erected on the upper surface of the base block 4 so as to correspond to the first blade portion 20 and the second blade member 30, respectively. The dies 40 and 50 have openings 40b and 50b for inserting the blade members 20 and 30, respectively. The opening 40b communicates with the space 23 provided in the base block 4 through a hole 4b formed on the upper surface of the base block 4. Thus, the space 23 can hold a remnant of a document generated when a hole is formed in the document by the blade member 20. Further, a lid member 6 is provided on the lower surface of the base block 4 so as to be detachable, so that the remaining pieces held in the space 23 can be discarded.
[0032]
The tops of the dies 40 and 50 are provided with shoulders 40a and 50a, respectively. As a result, when the lower plate 14 moves downward, the upper surfaces of the dies 40 and 50 start to enter the openings 14a formed in the lower plate 14, and the lower surfaces of the lower plates 14 become the shoulders 40a and 40a of the dies 40 and 50. The upper surfaces of the dies 40 and 50 are in contact with the upper surface of the lower plate 14 in contact with the upper surface 50a.
[0033]
FIG. 2 is a perspective view showing the blade members 20 and 30 in FIG. 1 upside down. The first blade portion 20 and the second blade member 30 are connected to the connecting member 21 at a predetermined interval L5. For example, as shown in FIG. 3, the first blade member 20 has a hole (a long hole) 45 in an oval shape in a laminated paper (document) 43, as shown in FIG. Can be. On the other hand, the second blade member 30 has a circular portion 30a and a rectangular portion 30b, and has a structure in which the side portion 30c has no blade. With such a second blade member 30, a slit 47 having a shape as shown in the figure can be formed without cutting the base end portion indicated by reference numeral 48a as shown in FIG. Here, the hatched portion surrounded by the slit 47 is referred to as a binding piece 48.
[0034]
With reference to FIG. 2, the width of the first blade member 20 in a direction (Y direction) orthogonal to the direction (X direction) in which the first blade member 20 and the second blade member face each other is denoted by L1, The width of the circular portion of the second blade member 30 in the Y direction is L2, and the width of the rectangular portion in the Y direction is L3. Then, the relationship between L1 and L2 is L1 <L2. The relationship between L2 and L3 is L2> L3, and the relationship between L1 and L3 is L1> L3.
[0035]
Further, the predetermined distance (the distance between the first blade portion 20 and the second blade member 30) L5 is substantially the same as the length L4 of the rectangular portion 30b in the X direction, and L4 is the same as L5 or L5. Longer. By taking such an interval, for example, as shown in FIG. 4, the binding piece 48 is folded around the base end 48 a toward the back surface side (perpendicular to the paper surface) of the stacked documents 43, The circular portion of the binding piece 48 can appear on the front side of the document 43. In this case, the circular portion of the binding piece 48 can be passed through the hole 45 by utilizing the elastic deformation of the paper. Thereby, a plurality of papers can be fastened.
[0036]
Next, the operation of the document binding apparatus 1 will be described with reference to FIGS.
[0037]
First, for example, documents 43 stacked by a person are placed on the lower plate 14. Next, as shown in FIG. 5, when the lever 16 is pressed down by a human hand or the like, the movable portion 33 moves downward against the spring S1, and the moving upper plate 13 and the lower portion in the stationary state move. The document 43 is clamped with the plate 14. The clamping force at this time is the spring force of the spring S2.
[0038]
When the lever 16 is further pushed down, as shown in FIG. 6, when the second blade member 30 reaches the upper surface of the upper plate 13, the lower support plate 9 reaches the upper end of the spring S3. This timing may be such that when the first blade member 20 reaches the upper surface of the upper plate 13, the lower support plate 9 reaches the upper end of the spring S3. This is due to the difference in the length of the blade members 20 and 30 in the up-down direction. The distance between the lower support plate 9 and the upper plate 13 in the state shown in FIG.
[0039]
When the lever 16 is further pressed down, the lower plate 14 moves downward while maintaining the distance T from the relationship between the spring constants of the springs S3 and S4 (S4 <S3). As a result, the upper surfaces of the dies 40 and 50 begin to enter the openings 14a, and the lower surface of the lower plate 14 contacts the shoulders 40a and 50a of the dies 40 and 50, as shown in FIG. Correspond to the upper surface of the lower plate 14.
[0040]
When the lever 16 is further pressed down, the blade members 20 and 30 pass through the openings 13a and 13b, break through the document 43 as shown in FIG. 8, and are inserted into the respective openings 40b and 50b of the dies 40 and 50, A hole 45 and a slit 47 are formed in the document 43 as shown in FIG. As a result, the binding piece 48 is formed so as to project substantially perpendicularly to the surface of the document 43. At this time, the pressing members 27 are moved to the left side in the figure by the cam mechanisms 31 and 32.
[0041]
Next, when the pressure of the lever 16 is reduced, the movable portion 33 moves upward by the spring force (return force) of the compression spring S1, as shown in FIG. That is, the operation is performed in the reverse order described above (the order of FIGS. 8, 7, 6, and 5). With this sequence of operations, the pressing members 27 are moved rightward in the drawing by the cam mechanisms 31 and 32. As a result, the distal end 27a of the pressing member presses the surface of the binding piece 48, and the binding piece 48 is turned 180 ° toward the hole 45. The width dimension of the tip 27a of the pressing member is smaller than the width L1 of the hole 45 (FIG. 2).
[0042]
When the pressing pressure of the lever 16 is further reduced, as shown in FIG. 10, the tip 27a of the pressing member 27 pushes the binding piece 48 upward, and the binding piece 48 emerges from the hole 45 toward the surface of the document 43. Thereby, the document 43 is in the state shown in FIG. 4, and a plurality of papers are fastened.
[0043]
In the present embodiment, as a result of being able to be bound in this way, there is no need to use a metal needle, which contributes to energy saving.
[0044]
Further, since the binding piece 48 has a circular portion having a width larger than the width of the hole 45, the binding piece 48 can be securely engaged with the hole 45, and a strong fastening force can be generated. .
[0045]
In the present embodiment, since the pressing member 27 for folding back the binding piece 48 is provided, the binding piece can be automatically folded back, which is convenient.
[0046]
FIG. 11 shows an overall perspective view of the document 43 bound in this manner. In this way, it is also possible to bind at one place, or to provide two pairs of the first blade member 20 and the second blade member as shown in FIG. 13 and to fasten the two pairs as shown in FIG. You can also. As a result, a stronger fastening force can be generated. In particular, when there are two pairs as described above, it is preferable that the two pairs be fastened in a symmetrical form (a form inverted by 180 °) as shown in FIG. Thus, since the two pairs of fasteners are arranged symmetrically in the reverse direction, some backlash generated by the one pair of fasteners is canceled out, and a more secure fastening is achieved. Further, in FIG. 12, the bending direction of the two pairs of binding pieces 48 is outward, but as shown in FIG. 14, the blade members are so set that the bending directions of the two pairs of binding pieces 48 are inward each other. 20 and 30 may be arranged.
[0047]
FIG. 15 shows an example in which the documents concluded in FIG. In this case, the size of the circular portion of the binding piece 48 (the size of the hole of the circular portion to be drilled) needs to be a size that the binding bar 61 provided in the file 60 can pass. Further, it is necessary to form the binding piece 48 and the hole 45 in accordance with the pitch (80 mm) between the two binding rods 61.
[0048]
Alternatively, the document 43 concluded in FIG. 14 may be stored in the file 60. In this case, it is also possible to pass the binding rod 61 of the file 60 through the remaining portion of the hole 45 inside the both binding pieces 48 in FIG.
[0049]
As described above, the following effects are achieved by the document binding according to the present embodiment.
1. It does not require any additional materials such as metal needles for binding documents, which is in line with the modern environment-oriented society.
2. It is also free from troublesome needle removal work for sorting when disposing of documents.
3. The shortage of the binding force and the restriction on the number of sheets to be bound, which are the drawbacks of the conventional document binding apparatus that does not use an additional material such as a metal needle, can be greatly improved.
4. Separation and rebinding for copying etc. can be easily performed only by hand, even for materials once bound.
5. After binding the documents, it is not necessary to drill holes when storing in a commercially available file.
6. When storing bound documents in a commercially available file, they are fastened in units of the specified number of bound sheets (or the specified number of perforated sheets). This is very convenient because it can be handled in units of bound documents (or in units of perforated documents). As described above, it is very effective to simply use as a punch instead of binding the documents.
7. Conventionally, two devices, a stapler and a punch, have been used separately for documents, but according to the present embodiment, all can be handled only by the document binding device 1.
[0050]
The present invention is not limited to the embodiments described above, and various modifications are possible.
[0051]
For example, in the above embodiment, the shape of the binding piece 48 is a combination of a circular portion and a rectangular portion, but the shape is not limited to this, and the circular portion may be a rectangle, a triangle, or an ellipse. Similarly, the shape of the hole 45 is not limited to the elliptical shape, and may be a circular or elliptical shape, or a U-shaped slit as indicated by reference numeral 65 in FIG. The point is that the relationship L1 <L2 may be maintained as described above.
[0052]
In the above embodiment, the binding piece 48 is bent toward the back side of the document. However, the binding piece 48 can be bent upward by changing the arrangement of the mechanism. It is also possible to change the vertical arrangement of the blade member 20 (30) and the die 40 (50).
[0053]
Further, the cam mechanisms 31 and 32 can be groove cam mechanisms or operated by link levers. The operation of the lever 16 is manually performed, but the up-and-down operation may be electric.
[0054]
【The invention's effect】
As described above, according to the present invention, it is possible to contribute to energy saving and easily bind documents.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a document binding device according to an embodiment of the present invention.
FIG. 2 is an enlarged perspective view of the blade member shown in FIG.
FIG. 3 is an enlarged plan view showing a state where holes and slits are formed in a document.
FIG. 4 is an enlarged plan view showing a state where documents are bound.
FIG. 5 is a diagram (part 1) illustrating an operation of the document binding apparatus.
FIG. 6 is a diagram (part 2) illustrating an operation of the document binding apparatus.
FIG. 7 is a diagram (part 3) illustrating an operation of the document binding device.
FIG. 8 is a diagram illustrating an operation of the document binding apparatus (part 4);
FIG. 9 is a diagram illustrating an operation of the document binding apparatus (part 5);
FIG. 10 is a view illustrating an operation of the document binding apparatus (part 6);
FIG. 11 is a perspective view (part 1) showing a bound document.
FIG. 12 is a perspective view (part 2) showing a bound document.
FIG. 13 is a perspective view of a document binding device provided with two pairs of blade members.
FIG. 14 is a perspective view (part 3) showing a bound document.
FIG. 15 is a diagram illustrating a state where a bound document is bound to a commercially available file.
FIG. 16 is an enlarged plan view of a document showing a modification in which a hole is formed as a U-shaped slit.
[Explanation of symbols]
L1, L2, L3 Width L5 Interval 1 Document binding device 20 First blade member 21 Connecting member 27 Pressing member 30 Second blade member 30a Circular portion 30b Rectangular portion 30c Side portion 43 ... Documents 45 ... Hole 47 ... Slits 48 ... Binding pieces

Claims (10)

A first blade member for piercing a hole penetrating from the front side to the back side of the plurality of stacked documents;
By forming a slit penetrating from the front side to the back side of the document at a position facing the hole, a portion surrounded by the slit is larger than the width of the hole in a direction substantially orthogonal to the facing direction. A second blade member forming a binding piece having at least a portion,
A document binding device, comprising: a connecting member that connects the first blade member and the second blade member at a predetermined interval. The document binding device according to claim 1,
A document binding device, further comprising a folding unit that folds the binding piece from the back side of the document to the front side through the hole. The document binding device according to claim 2,
The second blade member has means for projecting the formed binding piece substantially perpendicular to the surface of the document,
The document binding apparatus according to claim 1, wherein the folding unit has a pressing member that presses the front side of the protruding binding piece and turns back to the front side through the hole. A first blade member that forms a first portion surrounded by the first slit by forming a first slit that penetrates from the front side to the back side of the plurality of stacked documents;
By forming a second slit penetrating from the front side to the back side of the document at a position facing the first section, a section surrounded by the second slit is substantially orthogonal to the facing direction. A second blade member forming a binding piece having at least a portion larger than the width of the first portion in the direction of
A document binding device, comprising: a connecting member that connects the first blade member and the second blade member at a predetermined interval. The document binding device according to claim 4,
The said 1st slit is making a U-shape, The document binding apparatus characterized by the above-mentioned. A first blade member for piercing a first hole penetrating from a front side to a back side of a plurality of stacked documents;
By forming a slit penetrating from the front side to the back side of the document at a position facing the hole, a portion surrounded by the slit is larger than the width of the hole in a direction substantially orthogonal to the facing direction. A second blade member forming a binding piece having at least a portion,
A connection member for connecting the first blade member and the second blade member at a first interval,
A punch device, wherein two connecting members for connecting the first blade member and the second blade member are provided at a second interval. The punch device according to claim 6, wherein
Means for forming a second hole having a shape of a portion surrounded by the slit in the document by folding the binding piece from the back side of the document to the front side through the first hole. A punch device characterized by the above-mentioned. (A) drilling a hole that penetrates from the front side to the back side of a plurality of stacked documents;
(B) By forming a slit penetrating from the front surface side to the back surface side of the document at a position facing the hole, a portion surrounded by the slit is formed so that a portion of the hole in a direction substantially orthogonal to the direction facing the hole. Forming a binding piece having at least a portion larger than the width. A document binding method according to claim 8, wherein
A method for binding a document, further comprising, after the step (b), folding the binding piece from the back side of the document to the front side through the hole. (A) forming a first slit penetrating from the front side to the back side of a plurality of stacked documents to form a first portion surrounded by the first slit;
(B) By forming a second slit penetrating from the front side to the back side of the document at a position facing the first part, the part surrounded by the second slit is oriented in the facing direction. Forming a binding piece having at least a portion that is larger than the width of the first portion in a direction substantially perpendicular to the document.

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