Ring opening and closing bar and binding apparatus using the same

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a ring opening and closing bar to open and close easily a curl ring of a ring binder for binding papers and the like and a binding apparatus consisting of the ring binder, the opening and closing bar and the auxiliary devices for setting and positioning papers.

2. Related Art

Conventionally, when binding a given size of plastic plates, papers

1

, such as shown in

FIG. 43

, standard size of A

4

or B

5

(standard papers), a ring binder

3

having a curl ring

2

has been used. The ring binder

3

, as shown in

FIG. 44

, is constituted from a longitudinal base portion

3

A formed semi-circular in section perpendicular to the longitudinal direction of the base portion

3

A and a plurality of ring pieces

2

a

which are extended from one side of the base portion

3

A and curved circularly along the semi-circular base portion

3

A to contact and overlap the other side of the base portion

3

A. The tip ends of these ring pieces

2

a

are formed tapered.

When binding the papers

1

by the ring binder

3

, the curl ring

2

is opened using a paper binding apparatus

4

and holes

5

of the papers

1

are fitted by the curl ring

2

.

An explanation of a conventional curl ring

2

of a ring binder

3

will be carried out by showing how to open the curl ring. As shown in

FIG. 44

, on a putting portion

6

for papers

1

and the like, a binder setting portion

7

for setting a ring binder

3

is provided. Raised pawls

9

are provided at a regular spacing apart from and in parallel with a wall face

8

is extended laterally at an intermediate portion of each raised pawl

9

.

Further, under the raised pawls

9

a movable plate

11

able to be displaced horizontally is provided and on the end of the movable plate, reversely L-letter shaped pawls

1

are raised at a regular spacing. The pawls

12

are arranged in such a manner as those are overlapped with the projection

10

horizontally.

Above the setting portion

6

a paper holding portion

3

for holding the papers

1

and the like is provided turnably outside. This paper holding portion

13

is functionally in association with the movable plate

11

, and when the paper holding potion

13

is closed inside, the movable plate

11

is pushed out, and it is retracted when the paper holding portion

13

is opened outside. That is, by a movement of the movable plate

11

in a A direction, the raised pawls

9

and the reversely L-letter shaped pawls

12

are adapted to come close and be separated.

In

FIG. 44

, a sigh

14

represents a cover covering above the binder setting portion

7

.

Further, a sign

15

represents a guide plate with a positioning step

16

for being used when punching a hole

5

in the papers

1

by the paper binding apparatus

4

. The guide plate

15

is mounted rotatably on the putting portion

6

. In addition, on opposing faces of the putting portion

6

and the paper holding portion

13

, magnets

17

for clamping the positioned papers

1

are provided.

And, when binding the papers

1

, the cover

14

and the paper holding portion

13

are opened and the raised pawls

9

and the reversely L-shaped pawls

12

are adjusted, the base portion

3

A of the ring binder

3

is disposed in a binder setting portion

7

, that is between the wall face

8

and the raised pawls

9

and the curl ring

2

is disposed in such manner as the curl ring

2

is located between adjacent raised pawls

9

.

Further, the ring binder

3

is displaced laterally in such a manner as the projections

10

and the reversely L-shaped pawls

12

are inserted in the curl ring

2

and the paper holding portion

13

is closed inside, thereby the movable plate

11

is pushed out, as shown in

FIG. 45

, the reversely shaped pawls

12

are pushed out forward. Whereas, the pawls

2

a

of the curl ring

2

are removed from the other end of the base portion

3

A. In that state, the holes

5

of the papers

1

are coincided with the positions of the pawls

2

a

of the curl ring

2

, that is, enabling to be inserted, the paper holding portion

13

is returned, that is, opened, the pawls

12

are retracted with the movable plate

11

and the curl ring

2

is closed to finish the binding of the papers

1

.

For reference, if the holes

5

are not punched in the papers

1

, as shown in

FIG. 46

, with the above paper binding apparatus

4

or a punch

18

the holes

5

can be punched. In this case, as shown in

FIG. 44

, the paper holding portion

13

is raised and the papers

1

are put on the above the putting portion to abut the ends of the papers

1

against the positioning step

16

of the guide plate

15

, then the paper holding portion

13

is closed as shown in FIG.

46

. At that time the magnets

17

clamps the papers

1

magnetically to prevent the papers

1

from moving. Subsequently, the guide plate

15

is turned reversely toward a back side of the putting portion

6

for avoiding the punch

18

from touching the guide plate

15

and while abutting a projection

20

provided on the center of the punch

18

against a concave portion

19

provided on the center of the paper holding portion

13

the papers

1

are punched in turn.

In a conventional binding-apparatus

4

, since the base portion

3

A of a ring binder

3

is adjusted to the raised pawls

9

provided on a binder putting portion

7

, the curl rings

2

are adjusted on the reverse L-letter pawls

12

provided on the movable plate

11

and the ring pieces are made to be opened and closed by opening and closing the paper holding portion

13

together with the to and fro moving of the movable plate

11

, a structure for opening the ring binder

3

is complicated to invite a higher cost. Further, when opening the curl rings, while displacing the ring binder

3

laterally in such a manner as the reverse L-letter pawls

12

and the projections

10

are adjusted and in that state the paper holding portion

13

has to be closed, so that the operation becomes complicated. As mentioned above, in order to open the curl rings

2

of the ring binder

3

, a large scaled devices have been necessitated, so that a more efficiently-operational and simple opener for curl rings has been requested to be developed.

The present invention has been made in the light of such circumstances, a purpose thereof is to provide a ring opening/closing tool and a binding apparatus avoiding a complicated operation and pursuing a low cost.

As a solving means of the above problem, a first aspect of the present invention is characterized in an rectangular opening/closing bar is formed for being inserted in the curl ring and a introduction portion is provided on the tip of the opening/closing bar for guiding the bar in the curl ring.

According to the first aspect of the present invention, a rectangular opening/closing bar is formed, and on a tip end portion of the opening/closing bar an introduction portion is formed and when this opening/closing bar is inserted in a curl ring and a base portion of the ring binder, ring pieces are pushed up in turn by the introduction portion to be opened. Thus, when the curl rings are opened, ends of a plurality of papers overlapped is abutted against a side face of the opening/closing bar at the hole side and the holes of the papers and the ring pieces are corresponded each other, then the opening/closing bar is pulled out to cause the ring pieces to be fitted resiliently in the holes of the papers to finish binding.

Further, where the ring binder binding papers is to be removed to separate the papers and the ring binder, the papers are made to be located at the ring piece side of the ring binder, at that state, the opening/closing bar is made to be inserted in the ring binder.

In an invention described in a second aspect, in the first aspect, swollen portions are provided on both side ends of the opening/closing bar so as to be slid in the cur ring and base portion. According to the second aspect of the present invention, on both side ends of the opening/closing bar, swollen portions are provided respectively, and when the opening/closing bar is inserted inside the ring binder, a sliding of the opening/closing bar against the curl ring is made to be smooth. When the opening/closing bar opens the ring pieces, ends of a plurality of papers overlapped are abutted against a side wall of the opening/closing bar at the side of holes and the holes of the papers are made to correspond to the ring pieces of the curl ring, then the opening/closing bar is pulled out to cause the ring pieces of the curl ring to be fitted in the holes of the papers to finish binding.

Further, where the ring binder to bind papers is removed to separate the papers and the ring binder, the papers are made to be located at the ring piece side of the curl ring, in that state, the opening/closing bar having the swollen portions is inserted in the ring binder.

An invention described in a third aspect of the present invention, in the second aspect, a side wall face of the side having swollen potions of the opening/closing bar is formed linearly in section from an intersection between the lower swollen portion and the side wall face to the upper swollen portion along a tangential direction of the upper swollen portion in such a manner as the tips of the ring pieces are traced at a closing time.

According to the third aspect of the present invention, the side wall face at the swollen side of the opening/closing bar is configured linearly in section so as to coincide a tangential line of the upper swollen portion led from the intersection between the lower swollen portion and the side wall face to the upper swollen portion, and by abutting the ends of the papers overlapped in plurality at the hole side to this linearly spread wall face the papers are imbricated along the wall face and the imbricated holes of the papers and the moving traces of the tip ends of the ring pieces are coincided, thereby at the time of binding the insertion of the tip ends of the ring pieces in the holes becomes easier.

Further, where the papers and the ring binder are to be separated by removing the ring binder binding the papers, in the state where the papers are located at the ring piece side of the ring binder, the opening/closing bar is inserted in the ring binder.

In a fourth aspect of the present invention, in the first, second and third aspects, a guide plate is formed integrally with the opening/closing bar along the longitudinal direction, perpendicular to the side face, on which the swollen portions are provided, and near a back side of the opening/closing bar, wherein an upper surface of the guide plate is used as a stand for holding the papers to be bound and a lower surface of the guide plate is used as a guiding face when the opening/closing bar is inserted in the ring binder.

According to the fourth aspect of the present invention, the guide plate is provided integrally on the side face on which the swollen portions are provided along a longitudinal direction and perpendicular to the opening/closing bar. And when the ring pieces of curl ring are opened by inserting this opening/closing bar having the guide plate while the guide plate being in up-position of its upper surface and the lower surface of the guide plate sliding on the base portion of the ring binder. And, after opening the ring pieces the upper surface of the guide plate becomes a stand for putting the ends of the papers at the hole side, and by abutting the ends of the papers against the side face the papers are positioned. Then, by pulling out the opening/closing bar, the tip ends of the ring pieces are inserted in the holes of the papers in turn due to the resiliency.

Further, where the papers and the ring binder are to be separated by removing the ring binder binding the papers, in the state where the papers are located at the ring piece side of the ring binder, and make the guide plate positioned at the ring piece side of the curl ring and the opening/closing bar are made to be inserted in the curl rings of the ring binder and under the lower most papers in such a manner as it supports the papers.

According to a fifth aspect of the present invention, in the fourth aspect, the guide plate is extended perpendicular to the opening/closing bar so as to assure to hold the ends of the papers.

In a sixth aspect of the present invention, in the fourth or fifth aspect of the present invention, the side wall surface is formed sectional-linear in tangential direction from the intersection between the guide plate and the side face of the opening/closing bar to the upper swollen portion, and along which the tip ends of the ring pieces trace.

According to the sixth aspect of the present invention, since the side wall surface is formed sectional-linear in tangential direction from the intersection between the guide plate and the side face of the opening/closing bar to the upper swollen portion, and to the side wall face the papers overlapped in a plurality number are abutted, the ends and the holes of the papers are imbricated andalong that imbricated holes the tip ends of the ring pieces trace at the time of closing, which makes it easier to bind the papers.

Further, where the papers and the ring binder are to be separated by removing the ring binder binding the papers, in the state where the papers are located at the ring piece side of the ring binder, and make the guide plate positioned at the ring piece side of the curl ring and the opening/closing bar are made to be inserted in the curl rings of the ring binder and under the lower most papers in such a manner as it supports the papers.

In a seventh aspect of the present invention, guide portions are provided on both sides of a plane paper putting portion integrally, and on the front lower portion of the guide portion, a binder setting portion one part of which faces to the front lower portion of the paper putting portion is provided rotatably and on an upper portion of the guide portion a paper holding portion for holding the papers put on the putting portion is provided rotatably, which thereby constitute an auxiliary device for forming a binding apparatus in combination with the opening/closing bar to function as a means for opening the ring pieces of the curl ring set in the binder setting portion.

According to the seventh aspect of the present invention, the guide portions for guiding the papers put on the putting portion are provided integrally on both sides of the plane paper putting portion. Further, a binder setting portion is provided rotatably at the front lower portion of the guide portion, and where the papers are punched, the papers are positioned. Further, and at the front upper portion of the guide portion a paper holding portion to hold the papers is provided rotatably and the papers positioned at the putting portion are clamped with the putting portion and the holding portion to fix. And, the opening/closing bar is inserted in the curl ring of the ring binder set in the binder setting portion and open the curl ring, hereafter the opening/closing bar is pulled out to bind the papers.

Further, where using the auxiliary device and the opening/closing bar the papers and the ring binder are to be separated by removing the ring binder binding the papers, in the state where the papers and the ring pieces are located at the side of the putting portion of the auxiliary device, and the ring binder is made to be positioned at the binder setting portion, further making the guide plate positioned at the putting portion side, the opening/closing bar is made to be inserted in the curl ring while making in the lower most papers so as to support the papers.

In an eighth aspect of the present invention, in the seventh aspect, a groove portion is provided at the binder setting portion for setting ring binder along the front edge of the putting portion, and on one side wall of the groove a plurality of projections for being engaged with the curl ring of the ring binder are provided at intervals and the other side wall is formed lower than the one side wall and the upper end thereof is made to be a guide portion for the guide plate.

According to the eighth aspect of the present invention, a plurality of projections for positioning are provided at an interval on one side wall of the groove formed on the binder setting portion, the ring pieces of the ring binder are positioned by being engaged with these. Further, the other side wall is made lower than the one side wall, and in the case where the opening/closing bar is inserted in the curl ring set in the binder setting portion, it functions as a guide.

In a ninth aspect of the present invention, in the eighth aspect, intervals of the projections provided on the one side wall are formed at the entrance side of the opening/closing bar narrower than inside ones.

According to the ninth aspect of the present invention, the intervals of the positioning projections provided on one side wall of the groove are formed narrower at an area close to the entrance of the opening/closing bar, thereby it becomes easier to be entered by the opening/closing bar. After entering in the curl ring of the ring binder, due to a wide interval of the positioning projection, the opening/closing bar is held and becomes easier to slide.

In an tenth aspect of the present invention, a binding apparatus is formed with a groove to position the ring binder and a binder setting device formed by side walls one of which is made to be lower, and the opening/closing bar to be inserted so as to open the curl ring.

According to the tenth aspect of the present invention, the binder setting device is provided with the groove and the side wall portions one of which is formed lower than the other to form the groove, and by sliding on the side wall portion the guide plate of the opening/closing bar is guided and the ring binder is set and positioned at the groove portion. By inserting the opening/closing bar in the binder setting device set and positioned, the curl ring is opened and the papers are bound. Further, by setting the ring binder binding papers in the binder setting device and being inserted by the opening/closing bar, the ring binder and the papers are separated.

In an eleventh aspect of the present invention, the binder setting portion is provided perpendicular to an inclined putting member at the lower end portion to carry out the positioning of the papers put on the putting member. Further, on the binder setting portion a plurality of positioning projections are provided, with these projections the curl ring is engaged and thr ring binder is fixed, thereby the opening/closing bar is stabilized at the time of inserting and pulling out. Further, by setting the ring binder binding the papers is set in the binder setting device, and by inserting the opening/closing bar in the ring binder to separate the papers and the ring binder.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1

is a front view of an embodiment of an opening/closing bar of the present invention.

FIG. 2

is a sectional view along Q—Q line of FIG.

1

.

FIG. 3

is a perspective view of the opening/closing bar to open a ring binder.

FIG. 4

is a partially sectional view when binding papers with the ring binder opened by the opening/closing bar.

FIG. 5

is a front view showing another embodiment of the opening/closing bar of the present invention.

FIG. 6

is a sectional view showing along S—S line of FIG.

5

.

FIG. 7

is a perspective view showing a case where the ring binder is opened by the opening/closing bar shown in FIG.

5

.

FIG. 8

is a partially sectional view showing that the papers are bound by the ring binder opened by the opening/closing bar in FIG.

5

.

FIG.

9

(

a

) is a view corresponding to

FIG. 6

showing a sectional view of the side wall face of the opening/closing bar to be distortioned linear.

FIG.

9

(

b

) is an enlarged view in section of a trace of ring pieces at the time of binding the papers, that is, at the time of closing the ring pieces.

FIG. 10

is a front view of a further embodiment of the opening/closing bar of still further embodiment.

FIG. 11

is a view in arrow L of FIG.

10

.

FIG. 12

is a sectional view along M—M line of FIG.

10

.

FIG. 13

is a sectional view along N—N of FIG.

11

.

FIG. 14

is a perspective view of enlarged portion near the tip of the FIG.

10

.

FIG. 15

is a partially sectional view showing that the papers are bound with the ring binder opened by the opening/closing bar shown in FIG.

10

.

FIG. 16

is a front view showing another embodiment of FIG.

10

.

FIG. 17

is an arrow view of O of FIG.

16

.

FIG. 18

is a sectional view along P—P of FIG.

17

.

FIG. 19

is a sectional view of the side wall face distortioned linear of the opening/closing bar corresponding to FIG.

12

.

FIG. 20

shows a perspective view of an auxiliary device for enhancing the function of the opening/closing bar and constitute a binding apparatus with the opening/closing bar.

FIG. 21

is a sectional view along A—A line of FIG.

20

.

FIG. 22

is a plan view showing the binder setting portion shown in FIG.

20

.

FIG. 23

is an arrow B of FIG.

22

.

FIG. 24

is a bottom view of FIG.

22

.

FIG. 25

is an arrow C of FIG.

22

.

FIG. 26

is a sectional view along D—D of FIG.

22

.

FIG. 27

is a plan of the putting member of FIG.

20

.

FIG. 28

is an arrow E of FIG.

27

.

FIG. 29

is a sectional view along G—G line of FIG.

27

.

FIG. 30

is a sectional view along H—H line of FIG.

27

.

FIG. 31

is a plan view of the paper holding portion in FIG.

20

.

FIG. 32

is an arrow I of FIG.

31

.

FIG. 33

is a sectional view along J—J line of FIG.

31

.

FIG. 34

is a sectional view along K—K line of FIG.

31

.

FIG. 35

is a perspective view showing that the ring binder is set in the binderr setting portion of the auxiliary device for binding.

FIG. 36

is a partially enlarged sectional view showing the direction of the ring binder setting portion.

FIG. 37

is a perspective view showing that the opening/closing bar opens the curl ring disposed in the binder setting portion of the auxiliary device and binding the papers shown in FIG.

35

.

FIG. 38

is a sectional view showing the state where the opening/closing bar opens the curl ring of the ring binder disposed in the binder setting portion of the auxiliary device for binding.

FIG. 39

is a perspective view showing that the opening/closing bar opens the ring pieces to fit these in the holes of the papers.

FIG. 40

shows that the opening/closing bar is being pulled out-while arranging the papers with hand.

FIG. 41

is a perspective view showing another embodiment of the binder setting device.

FIG. 42

is a perspective view of FIG.

41

.

FIG. 43

is a perspective view showing a conventional art in which the papers are bound with the ring binder.

FIG. 44

is a perspective view showing a conventional binding apparatus.

FIG. 45

is a plan view showing a main part in which a conventional binding apparatus opens the curl ring of the ring binder.

FIG. 46

is a perspective view showing that a conventional binding apparatus punches the papers.

EMBODIMENT

Hereinafter, explanations of a ring opening/closing bar for a ring and a binding apparatus of the present invention will be done referring to attached drawings. FIGS.

1

˜

19

relate to a ring opening/closing bar for opening curl rings

2

of a ring binder

3

for binding papers

1

and plastic covers, and FIGS.

20

˜

40

relate to a binding apparatus formed in combination with the above opening/closing bar and an auxiliary device

21

for positioning the papers

1

and the plastic covers and the like. And further,

FIGS. 41 and 42

relate to a binding apparatus formed in combination with the above ring opening/closing bar and a binder setting device

41

for positioning a ring binder

3

.

First, a ring opening/closing bar

28

X is explained shown in

FIGS. 1 and 2

. Identical signs with conventional arts are identically shown. This ring opening/closing bar

28

X looks like approximately a sword in a front view and like I-letter in section as shown in

FIG. 2

, and a tip end of tip end of an opening/closing bar

28

A is formed with an introduction part

28

a

so as to easily insert in a curl ring

2

. The ring opening/closing bar

28

X may be made of a resin or of a metal made, but in this embodiment a resin made one is used.

A shape of the introduction part

28

a

of the tip end of the opening/closing bar

28

A is configured rounded. For reference, the shape of such introduction part

28

a

may be of any shape if it is configured like easily to be inserted in the curl ring

2

, for instance, triangular, arch-like or oval. The portion of the opening/closing bar

28

A except the introduction portion

28

a

has a width in dimension larger than the diameter of the curl ring to be inserted by the opening/closing bar so as to widen the ring pieces. In

FIG. 1

, a sign

28

E shows a handle provided on a rear end of the opening/closing bar

28

A.

A function of the opening/closing bar

28

X is explained referring to

FIGS. 3 and 4

. Where the curl ring

2

of the ring binder

3

is to be opened, as shown in

FIG. 3

, while supporting the ring binder

3

with one hand, the ring opening/closing bar

28

X is held with other hand, then a tip part (introduction part

28

a

) of the ring opening/closing bar

28

X is forwarded in the curl ring

2

from an end of a base part

3

A, thereby ring pieces

2

a

of the curl ring

2

of the ring binder

3

are in turn opened by being raised smooth with its introduction part

28

a

. In other words, when the ring opening/closing bar

28

X is inserted, the ring pieces

2

a

of the curl ring

2

are separated from the base part

3

A of the ring binder

3

and supported on one side end of the opening/closing bar

28

A.

When the curl ring

2

is opened by the ring opening/closing bar

28

X, ends of a plurality pieces of the papers

1

of the pierced hole

5

side are abutted to a side wall face

28

b

of the ring opening/closing bar

28

A while being supported by the base part

3

A and the holes

5

of the papers

1

and the ring pieces

2

a

are positioned by opposing each other. Then, the ring opening/closing bar

28

A is pulled out from the ring binder

3

, the ring pieces

2

a

of the curl ring

2

are fitted in the holes

5

of the papers

1

to bind the papers

1

.

Further, in order to separate the papers

1

from the ring binder

3

, the papers

1

are positioned where the papers are inserted by the ring pieces

2

a

, and the ring opening/closing bar

28

A is inserted in the ring binder

3

.

Next, another embodiment of the ring opening/closing bar

28

A is explained referring to

FIGS. 5 and 6

. For reference, the identical parts with the ones of FIGS.

1

˜

4

are identically indicated and the explanations thereof are omitted. This ring opening/closing bar

28

A is provided with the introduction part

28

a

on the tip end thereof. And, on both side ends of the plate-like opening/closing bar

28

A along the longitudinal direction are provided with swollen portions

28

B and

28

C in section along overall length of the bar. These swollen portions

28

B and

28

C are disposed on one side of the plate-like bar

28

A and when a short side of the bar is set vertically, the swollen portion

28

B is located at an upper side and the swollen portion

28

C is located at a lower side as shown in FIG.

6

. Due to these swollen portions

28

B and

28

C, the papers

1

are easily supported between them.

The swollen portion

28

B is configured approximately circular in section and the swollen portion

28

C is configured approximately square in order to make the sliding friction small between the opening/closing bar

28

A and the curl ring

2

when the bar is inserted.

An operation of the above structured opening/closing bar

28

A is explained referring to

FIGS. 7 and 8

. As shown in

FIG. 7

, the ring binder

3

is held by one hand, and the opening/closing bar

28

A is held by the other hand, then the introduction portion

28

a

of the tip end of the opening/closing bar

28

A is inserted into the curl ring

2

of the ring binder

3

from the end of thereof and due to the swollen portions

28

B and

28

C the opening/closing bar

28

A is slid in the curl ring

2

smoothly.

After opening of the curl ring

2

, a plurality of overlapped papers

1

are abutted to the side wall face

28

b

at the end side of hole to position the papers

1

to be bound, supported by the lower swollen portion

28

C and the base portion

3

A of the ring binder

3

and made the holes

5

of the papers

1

to correspond to the ring pieces

2

a

of the curl ring

2

, then the opening/closing bar

28

A is pulled out from the ring binder

3

, thereby the ring pieces

2

a

of the curl ring

2

are in turn fitted in the holes

5

of the papers

1

to bind the papers

1

.

Further, in order to remove the ring binder

3

and separate the papers

1

and the ring binder

3

, the papers

1

are positioned in a state where the holes

5

are inserted by the ring pieces

2

a

, and the opening/closing bar

28

A is inserted in the ring binder

3

.

In an embodiment shown in FIG.

9

(A), the side wall face on which the swollen portions

28

B,

28

C are formed with a face

28

b

containing a tangential linear in section which is extended from the upper swollen portion

28

B to a proximal portion of the lower swollen portion

28

C.

Thus, since the side wall face

28

on which the swollen portions

28

B,

28

C are provided is made to be an inclined plane face

28

b

, when a plurality of overlapped papers

1

abut against plane face

28

b

, the ends of the papers

1

are imbrignated along the inclined plane face

28

b

, as well the imbrignated holes

5

approximately coincide with a moving trace of the ring pieces

2

a

of the curl ring

2

at the time of closing due to resiliency.

Thereby, when filing the papers

1

, the curl ring

2

becomes easily to fit in the holes

5

of the papers

1

. This is because, when the curl ring

2

opens and closes, the ring

2

a

of the curl ring

2

moves approximately linearly with respect to the base portion

3

A, so that if the ends of the papers

1

(the holes

5

) are imbrignated linearly along the plane face

28

b

, the curl ring

2

is easily fitted in the holes

5

of the papers

1

.

Further, in order to remove the ring binder

3

which is binding the papers

1

and separate the papers

1

and the ring binder

3

, while positioning the papers

1

to be inserted by the ring pieces

2

a

, the opening/closing bar

28

A is inserted in the ring binder

3

. This opening/closing bar

28

A is appropriate when removing a plurality of papers

1

overlapped.

Finally, another embodiment of the opening/closing bar

28

A shown in FIGS.

10

˜

14

is explained. For reference, signs of parts identical with what are shown in FIGS.

5

˜

9

are attached with identical signs and explanations thereof are omitted. This opening/closing bar

28

A is provided with a guide plate

28

D on the side wall face (plane face)

28

b

and between the swollen portions

28

B and

28

C, in more detail, at the inner proximal portion of the swollen portion C integrally and perpendicular to the side wall face

28

b

. This guide plate

28

D is provided on allover the length of the opening/closing bar

28

(see FIGS.

10

and

11

).

And, one upper side of the guide plate

28

D functions as a stand for the papers

1

and the lower side of the guide plate functions as a guiding portion to the base portion

3

A of the ring binder

3

when the opening/closing bar

28

A slides in the ring binder

3

.

An opening manner of the curl ring

2

of the ring binder

3

using thus constituted opening/closing bar

28

A is explained with FIG.

15

. When the opening/closing bar

28

A is inserted in the ring binder

3

while positioning the swollen portion

28

B of the opening/closing bar

28

A at the ring

2

a

side of the curl ring

2

of the ring binder

3

and the guide plate

28

D at the base portion

3

A of the ring binder

3

, the ring pieces

2

a

of the curl ring

2

are in turn raised by the introduction portion

28

a

of the tip end of the opening/closing bar

28

A and held on the swollen portion

28

B side, and eventually all ring pieces

2

a

are opened.

Hereinafter, the ends of the hole

5

side of the papers

1

are abutted against the wall side face

28

b

to support the papers

1

on the guide plate

28

D so as to coincide the tip ends of the ring pieces

2

a

with the hole

5

positions. From that state, by pulling out the opening/closing bar

28

A the ring pieces

2

a

of the curl ring

2

are fitted in the holes

5

of the papers

1

in turn to bind the papers

1

.

Further, in order to remove the ring binder

3

which is binding the papers

1

and separate the papers

1

and the ring binder

3

, while positioning the papers

1

to be inserted by the ring pieces

2

a

and the guide plate

28

D at the inner side of the ring

2

a

and under the lowermost papers

1

, the opening/closing bar

28

A is inserted in the ring binder

3

. This opening/closing bar

28

A is appropriate when removing a plurality of papers

1

overlapped.

For reference, the above embodiment may be formed by providing the guide plate

28

D to the opening/closing bar

28

A merely having the introduction portion

28

a

without providing the swollen portions

28

B and

28

C. An operation of this case is identical with the one of

FIG. 15

, so that an explanation thereof is omitted.

Further, an opening/closing bar

38

A shown in FIGS.

16

˜

18

shows another embodiment, in which the guide plate

38

D is formed on the side wall face

38

b

perpendicular thereto so as to be longer, as shown in

FIG. 17

, than the embodiment of the guide plate

28

D shown in FIG.

11

. As a result, the ends of the hole side of the papers

1

are stably held, thereby the ring pieces

2

a

of the curl ring

2

of the ring binder

3

becomes easily fitted in.

And, on the tip end of the opening/closing bar

38

A also an introduction portion

38

a

as well as

28

a

in the previous embodiment, and on both side ends of the opening/closing bar

38

A too, swollen portions

38

B and

38

C are formed. Further, the papers

1

can be abutted against the side wall face

38

a

. This opening/closing bar

38

A operates as well as the opening/closing bar

28

A, so that an explanation therefor is omitted.

Now, if the opening/closing bars

28

A and

38

A are used in a laterally vertical posture and the height of the bars is more tall, the more lager in diameter curl rings

2

of the ring binder

3

can be opened, at that time the sectional shapes of the swollen portions

28

B,

28

C and

38

B,

38

C are made larger than what are shown in

FIGS. 12 and 18

. And, although the sectional shapes of the opening/closing bar

28

A in the longitudinal direction are formed per embodiment an I-letter (plate-like), approximately C-letter and approximately L-letter, the shapes are not limited to those, the sectional shape of each opening/closing bar may be approximately circular, oval and polygonal (for instance a pentagon or hexagon).

Further, in the embodiment shown in

FIG. 19

, the side wall face

28

b

to which the guide plate

28

D is formed is formed along a face containing every tangential line from the upper swollen portion

28

B to the proximal portion of the guide plate

28

, in such a manner as every tip ends of the ring pieces

2

a

of the curl ring

2

of the ring binder

3

traces the side wall face

28

b

at the time of closing. If a plurality of papers

1

are abutted against such a plane face at the hole

5

side, the ends of the hole side are imbricated, and thereby the holes

5

prepared for binding are also imbricated along the ends.

Accordingly, when binding a plurality of papers

1

with a ring binder

3

, it is easily carried out by using the opening/closing bar. This is because, when the curl ring

2

is opened and closed, since the ring

2

a

of the curl ring

2

moves obliquely straight with respect to the base portion

3

A, if the ends of the papers

1

at the side of the holes

5

are imbricated, the holes

5

of the papers

1

also disposed obliquely straight and the curl ring

2

is easily fitted in the holes

5

of the papers.

Next,

FIGS. 20 and 21

show an auxiliary device

21

for binding having functions of positioning the ring binder

3

and the like. A binding apparatus which is formed with a combination of this auxiliary device

21

for binding and the opening/closing bars

28

A or

38

A separated from the auxiliary device

21

will be explained. In this embodiment, it is illustrated that the ring binder

3

set in this auxiliary device

21

for binding is opened by the opening/closing bar

28

A having the guide plate

28

D (FIGS.

10

˜

14

). The auxiliary device

21

for binding functions to position the ring binder

3

to be opened so as to enable the opening/closing bar

28

A to be easily inserted in the ring binder

3

at the time of opening the ring binder

3

. Now, conventional members are attached identically with the identical signs. Further, in

FIGS. 20 and 21

, signs F and R show the front direction and rear direction of the auxiliary device

21

for convenience sake.

This auxiliary device

21

for binding is formed by adding a ring binder positioning means to a conventional punch for the papers

1

. On both sides of a paper putting means

22

of the auxiliary device

21

, guide portions

23

are formed integrally. Front sides of these guide portions are formed in a narrowed portion

23

a

respectively and on undersides of the narrowed portions

23

a

a ring binder setting portion

24

for positioning a ring binder

3

and papers

1

is mounted rotatably. On front upper sides of the narrowed portions

23

a

a holding portion

25

for holding the papers

1

put on a plane portion

22

a

of the paper putting means

22

is mounted rotatably.

Hereinafter, respective portion is explained more in detail.

FIG. 22

is a plan view of the U-letter shaped binder setting portion

24

mounted rotatably on the narrowed portions

23

a

of both sides of the paper putting member

22

and

FIG. 23

is a front view (an arrow B in FIG.

22

). Further,

FIG. 24

is a bottom view thereof. A groove

26

is formed on the binder setting portion

24

along the front edge of the paper putting member

22

(see FIGS.

25

and

26

). The ring binder

3

to bind the papers

1

is put in this groove

26

. Accordingly, a width of the groove

26

is set approximately identical with the outer diameter of the ring binder

3

.

Further, on one side wall

26

a

of the groove

26

, a plurality of vertical projections

27

for positioning the curl rings of the ring binder

3

by being engaged with the curl ring

2

are provided at a given spacing. The spacing of the projections each other is arranged in such a manner as it becomes narrower most at an entrance portion

26

c

of the opening/closing bar

28

A for being inserted fo opening the curl ring

2

set in the groove

26

and more wider at the portion passing over the entrance portion

26

c

. This arrangement is for the purpose of a smooth y inserting of the opening/closing bar in the ring binder

3

.

Further, the another side wall

26

b

is formed lower than the one side wall

26

a

in height. That is, the height of the another wall

26

b

is arranged in such a manner as one area of the upper end of the another wall

25

b

is faced to the underside of the front edge of the paper putting member

22

when the binder setting portion

24

is mounted on the paper putting portion

22

. And, bearing portions

30

(

FIG. 26

) having a bearing holes

29

are provided on both leg portions

24

a

of the binder setting portion

24

.

FIG. 27

is a plan view of the paper putting portion

22

. On both sides of the paper putting portion

22

wide guide portions

23

are provided integrally in a front-rear direction. The front side of the guide portion

23

is formed in a narrowed portion

23

a

integral with the guide portion

23

. A bearing hole

31

is provided on the front-upper portion of the narrowed portion

23

a

(FIGS.

28

˜

30

), in which the holding portion

25

is mounted rotatably.

Further, a bearing portion

33

(

FIG. 30

) having a bearing hole

32

is provided at the underside of approximately intermediate portion of the narrowed portion

23

a

and the binder setting portion

24

is mounted rotatably through a not shown shaft which comes through the bearing hole

32

of the bearing portion

33

and a bearing hole

29

of the bearing portion

30

provided on leg portions

24

a

(

FIG. 26

) of the binder setting portion

24

. These leg portions

24

a

of the binder setting portion

24

are mounted by being arranged in a cut out portion

34

of the plane portion

22

a

of the paper putting member

22

. For reference, a sign

17

designates a magnet in

FIGS. 21

,

27

and

29

, which is mounted on the plane portion

22

a.

FIG. 31

is a plan view of the above holding portion

25

. The holding portion

25

is approximately U-letter shaped in a plan view and on each tip side of two leg portions

25

a

a bearing portion

36

having a bearing hole

35

is provided respectively (FIGS.

32

˜

34

). The binder setting portion

24

is mounted rotatably on this bearing hole

35

and the bearing hole

31

(

FIG. 28

) of the narrowed portion

23

a

of the paper putting member

22

.

Further, a punch guide plate

37

having recessed portions

19

for fitting a projection

19

to a punch

18

(

FIG. 46

) within an inside portion of the leg portion

25

a

in the holding portion

25

. And, a magnet

17

is mounted on the surface of the paper holding portion

25

opposing the papers

1

so as to face to the magnet

17

of the plane portion

22

a

of the paper putting member

22

(FIG.

34

).

The operation of the auxiliary binding device

21

for positioning the ring binder

3

is explained. This auxiliary device

21

is provided with two functions to punch the papers

1

and bind the papers

1

by opening the curl ring

2

of the ring binder

3

. First, a function to punch the papers

1

is explained. Since this case is identical with the one punching operation explained in

FIG. 46

as a conventional art, its explanation is simplified.

In

FIG. 20

, the holding portion

25

is raised so as to be separated from the putting member

22

of the auxiliary device

21

and in that status the papers

1

are put on the plane portion

22

a

of the putting member

22

and made the papers to come through the U-letter shaped holding portion and made the tip ends of the papers

1

to abut against the positioning projection

27

of the binder fitting portion

24

and thereafter, by laying down the holding portion

25

the papers

1

positioned are clamped by the holding portion

25

and the plane portion

22

a

of the putting member

22

and strongly held by the magnet

17

.

Hereinafter, the binder setting portion

24

is turned toward a back side of the putting member

22

around shafts in the bearing holes

29

and make the ends of the papers

1

projected from the front edge of the putting member

22

. And as shown in

FIG. 46

of a conventional art, the punch

18

is positioned by fitting the projection

20

in the recessed portions

19

of the punch guide plate

37

of the holding portion

25

and the holes

5

are punched in turn while moving the punch

18

by sliding along the punch guide plate

37

.

Next, a case where the punched papers

1

are bound with the ring binder

3

is explained. First, as shown in

FIG. 20

, the binder setting portion

24

is returned to the original position where it is not turned, the ring binder

3

is set in the groove portion

26

as shown in FIG.

36

. In this case, make the ring pieces

2

a

of the curl ring

2

is adapted to be positioned at the side of the putting member

22

as shown in

FIG. 36

, at which time the ring binder

3

is easily positioned in the groove portion

26

while the curl ring

2

and the positioning projection

27

are smoothly fitted. At that time, the punched papers

1

are once removed.

After the ring binder

3

is positioned, the opening/closing bar

28

A is inserted in the curl ring

2

, as shown in FIG.

37

. The guide plate

28

D of the opening/closing bar

28

A is inserted between an upper end of the other side wall

26

b

of the groove portion

26

and a lower surface of the front edge of the plane portion

22

a

of the putting member

22

and positioned. Thereby, the opening/closing bar

28

A is guided securely when it is slid.

Further, since the swollen portions

28

B and

28

C are provided on both sides of the opening/closing bar

28

A, it slides easily in the curl ring

2

and the base portion

3

A and the ring pieces

2

a

of the curl ring

2

are opened easily departing from the base portion

3

A.

After the ring pieces

2

a

are opened, the punched papers

1

which are once removed are pushed by putting the on the putting member

22

in an arrow direction and abutted against the opening/closing bar

28

A, as a result, the holes

5

of the papers

1

and the ring pieces

2

a

are made to be corresponded each other and clamped tightly with the holding portion

25

and the putting member

22

. Further, as shown in

FIG. 40

, the opening/closing bar

28

A is pulled out while holding the auxiliary device

21

with a hand preventing it from moving. Thereby, the ring pieces

2

a

are inserted in the holes

5

of the papers

1

to bind the papers

1

.

At the time of binding the papers

1

in the ring binder

3

and removing the ring binder

3

from the papers

1

, the positioning of the papers

1

can be carried out by positioning the ends of the papers

1

on the upper side of the guide plate

28

D or making the papers

1

abutted against the opening/closing bar

28

A so as to putf the papers

1

on the guide plate

28

D. Further, the ring pieces

2

a

of the curl ring

2

can be positioned at the inside of the basic portion

3

A by the guide plate

28

D when the curl ring

2

is closed by pulling out the opening/closing bar

28

A from the ring binder

3

. In order to secure such operation, the diameter of the lower swollen portion

28

C in section may be set larger than the upper swollen portion

28

B.

Thus, the papers

1

binding operation was explained, but when removing the ring binder

3

from the papers

1

, a reverse process of the above may be employed. That is, the ring binder is made to be set in the groove portion

26

of the binder setting portion

24

while making the ring binder

3

located in the direction identical with the time of binding the papers

1

. And, while holding the ring binder

3

, the papers

1

are drawn a little so as to make the opening/closing bar

28

A enabled to be easily inserted in the curl ring

2

.

Subsequently, the opening/closing bar

28

A is inserted in the curl ring

2

while positioning the guide plate

28

D of the opening/closing bar

28

A between the putting member

22

and the upper end of the other side wall

26

b

of the groove portion

26

. Thereby, the curl ring is opened to take out the papers

1

. Then, the opening/closing bar

28

A may be pulled out from the curl ring

2

.

Although the auxiliary device

21

as an auxiliary tool for the above opening/closing bar

28

A is constituted in general from the putting member

22

for putting the papers

1

, the holding portion

24

for papers

1

and the binder setting portion

24

contributing for both positioning the papers

1

and setting the ring binder

3

, a binder setting device can be solely set independently which function as setting the binder ring

3

.

In this case, a guide portion (for example a recessed portion provided on the wall portion or a fitting gap formed between an upper end of the wall portion and other member) for guiding the guide plate

28

D of the opening/closing bar

28

A can be preferably provided.

Further, what is shown in

FIGS. 41 and 42

is another binder setting device

41

. This binder setting device

41

is structured by disposing a plate-like paper putting portion

43

on an inclined portion of a sectional triangular base stand

42

, and on a front lower portion a binder setting portion

44

for the ring binder

3

is provided approximately perpendicular to the putting portion

43

. The binder setting portion

44

is configured approximately L-letter shaped in a side view and at a bottomed position thereof a plural projections

45

for positioning are arranged at a given spacing. The positioning projections

45

are disposed in

5

rows of

2

rows. A front-lower portion of the putting portion

43

is formed in a stepped portion

43

a

so as to make the holes

5

of the papers

1

enabled easily to fit to the curl ring

2

of the ring binder

3

set on the binder setting portion

44

, and below the stepped portion

43

a

one end side of the L-letter figured binder setting portion

44

is mounted.

Thereby, it becomes easier to insert the opening/closing bar

28

A in the curl ring

2

of the ring binder

3

set on the binder setting portion

44

. For reference, a sign

46

in

FIGS. 41

,

42

indicates a guide for the papers

1

. And, such manners as the ring binder

3

is positioned on the binder setting portion

44

of the binder setting device

41

and makes the opened curl ring

2

inserted in the holes

5

of the papers

1

and as the ring binder

3

is made to be separated from the papers

1

bound by the ring binder

3

are approximately identical with the above and the explanation is omitted.

According to the first aspect of the present invention, since the opening/closing bar is formed with the introduction part on the tip end, when the opening/closing bar having this introduction part is inserted in the curl ring of the ring binder and in the base portion, the ring pieces of the curl ring is smoothly pushed up to open the curl ring easily.

Further, when curl ring is opened, the positioning of the papers is carried out by abutting the ends of the overlapped papers in plural number at the side of the holes against the side wall face of the opening/closing bar. And, when pulling out the opening/closing bar from the ring binder while facing the holes of the papers to the ring pieces of the curl ring, the curl ring is easily fitted in the holes of the papers to bind the papers.

And, when the ring binder to bind the papers is removed and separate the papers and ring binder, the papers are made to be positioned at the side of the ring pieces of the curl ring and the opening/closing bar is inserted in the ring binder, then the papers and ring binder is separated easily.

According to the second aspect of the present invention, since swollen portions are provided on both side ends in a longitudinal direction of the opening/closing bar respectively, when the opening/closing bar is inserted in the curl ring of the ring binder, the opening/closing bar can be slid smoothly along the longitudinal direction of the inner circumferences of the ring binder and the base portion. And, when the curl ring is opened by the opening/closing bar, the ends of the papers overlapped in plural number at the hole side are abutted to the side wall surface of the opening/closing bar to position the papers while facing the holes of the papers and the ring pieces of the curl ring. Then, if the opening/closing bar is pulled out from the ring binder, the ring pieces of the curl ring are fitted in the holes of the papers easily to bind the papers.

And, when the ring binder to bind the papers is removed and separate the papers and ring binder, the papers are made to be positioned at the side of the ring pieces of the curl ring and the opening/closing bar is inserted in the ring binder, then the papers and ring binder is separated easily.

According to the third aspect of the present invention, since the side wall face, on which the swollen portions are provided, is made linear in section along which the ring pieces are traced at the time of closing of the ring binder, if the ends of the papers are abutted against the linear portion at the hole side, the holes of the papers overlapped in plural number can be accorded with the moving trace of the ring pieces of the curl ring at the time of closing. Thereby, at the time of binding the papers, the curl ring is easily fitted in the holes of the papers.

And, when the ring binder to bind the papers is removed and separate the papers and ring binder, the papers are made to be positioned at the side of the ring pieces of the curl ring and the opening/closing bar the side wall face of which is configured linear in section is inserted in the ring binder, then the papers and ring binder is separated easily.

According to the fourth aspect of the present invention, since the guide plate is provided perpendicular to the side wall face of the opening/closing bar, when the opening/closing bar is inserted in the ring binder, the lower side of the guide plate touches the base portion of the ring binder to guide securely the opening/closing bar. Further, since the upper portion of the guide plate is used as the stand portion for supporting the ends of the papers at the time of fitting the curl ring in the holes of the papers, this stand portion and the opening/closing bar can position the papers securely. Thereby, the ring pieces of the curl ring can be easily inserted in the holes of the papers.

And, when the ring binder to bind the papers is removed and separate the papers and ring binder, the papers are made to be positioned at the side of the ring pieces of the curl ring and the guide plate of the opening/closing bar is positioned at the side the ring pieces side and the guide plate is inserted in the curl ring while supporting the lower most papers, then the papers and ring binder is separated easily.

According to the fifth aspect of the present invention, since the guide plate is extended perpendicular to the side wall face of the opening/closing bar, the ends of the papers are supported securely and the papers are positioned securely between the extended guide plate and the side wall face of the opening/closing bar.

According to the sixth aspect of the present invention, since the side wall face of the opening/closing bar on which the guide plate is provided is formed linear in section so as to be traced by the moving tip end of the ring pieces at the time of closing of the ring binder, the ends of the papers can be imbricated linearly by abutting the papers overlapped in plural number, when the ends of the papers overlapped in plural number are abutted to that sectionally liear portion, the ends of the papers can be imbricated linearly. Thereby, the imbricated holes of the papers are accorded with the movement of the ring pieces of the curl ring to fit the curl ring in the holes of the papers easily.

And, when the ring binder to bind the papers is removed to separate the papers from the ring binder, the papers are made to be positioned at the side of the ring pieces of the curl ring, the guide plate of the opening/closing bar the side wall face of which is formed obliquely linear in section is made to be positioned at the side of the ring pieces of the curl ring, the guide plate is inserted in the lower most papers so as to support the papers and the opening/closing bar is inserted in the curl ring, the papers and the ring binder are separated easily.

As described above, by using the opening/closing bar is having the introduction portion, the swollen portions and the guide plate, it is easy to open the ring binder not only to bind the papers with the ring binder, but also to separate the papers bound by the ring binder from the ring binder easily.

According to the seventh aspect of the present invention, since the front lower portion of the guide portion is provided rotatably with the binder setting portion, when punching the papers this binder setting portion is turned backside, and when binding the papers it is returned in original position. Then, by setting the ring binder on the binder setting portion, the positioning of the ring binder is carried out securely. Further, when the ring pieces are inserted in the curl ring of the ring binder set on the binder setting portion, the curl ring is opened easily. Accordingly, the apparatus for opening the ring binder ca be simplified and low-priced to avoid the complicated processes.

And, in order to separate the ring binder which binds the papers using the auxiliary device and the opening/closing bar and the papers, the papers and the ring pieces of the curl ring are made to be positioned at the side of the putting member of the auxiliary device and the ring binder is made to be positioned at the side of the above putting member, further the guide plate of the opening/closing bar is made to be positioned at the side of the putting member, and while inserting the guide plate under the lower most of the papers so as to support the papers, the opening/closing bar is made to be inserted in the curl ring of the ring binder, and thereby the papers and the ring binder are separated easily.

According to the eighth aspect of the present invention, since a plurality of positioning projections are provided on one side wall of the groove portion formed on the binder setting portion, when the ring pieces of the curl ring are made to be engaged with the projections, the ring binder is positioned securely, furthermore, since another side wall which forms a groove portion is formed lower than the one side wall, if the guide plate is contacted on another side wall, the opening/closing bar inserted in the curl ring is guided securely.

And, according to the ninth aspect of the present invention, since the intervals of the positioning projections provided on the groove portion are made narrower at the adjacent to the inserting opening of the opening/closing bar, the opening/closing bar can be inserted easily in the curl ring of the ring binder. After insertion, the ring binder is maintained at the widened projections and the opening/closing bar is guided securely.

According to the tenth aspect of the present invention, since the groove portion and the wall sides one of which is lower than the other are provided on the binder setting portion, the ring binder can be set on the groove portion and in addition the lower one can be a guide portion to be touched with the guide plate of the opening/closing bar. Accordingly, at the time of making the ring binder opened with this guide portion the opening/closing bar can be guided by the guide portion. As mentioned above, the ring binder is set on the binder setting device and in this ring binder the opening/closing bar is inserted to open easily the curl ring of the ring binder. Thereby, the papers are not only easily bound but also separated easily from the ring binder.

According to the eleventh aspect of the present invention, since, on both sides of the obliquely inclined putting member the papers guide portions are provided and on the front-lower portion of the putting portion the binder setting portion is provided perpendicular to the putting portion, the positioning of the papers put on the putting portion is carried out securely. Furthermore, since a plurality of positioning projections are provided on the binder setting portion, if with these positioning projections the curl ring of the ring binder is engaged, the ring binder is fixed on these and it is easily carried out to operate the opening/closing bar at the time of inserting the opening/closing bar in the ring binder or pulling out it from the ring binder. Accordingly, it is easily carried out to bind the papers with using the ring binder. In addition, if to this binder setting device the ring binder bound with the papers is set, it becomes easier to insert the opening/closing bar in the ring binder so to separate the papers bound in the ring binder and the ring binder.

Number	Date	Country	Kind
11-309496	Oct 1999	JP
2000-221295	Jul 2000	JP

Number	Name	Date	Kind
4758125	Wahl	Jul 1988	A
5197842	Bross	Mar 1993	A
6000895	Maes	Dec 1999	A

Number	Date	Country
2362440	Jun 1974	DE
0529881	Mar 1993	EP
2001-191678	Jul 2001	JP

Ring opening and closing bar and binding apparatus using the same

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