JP6079010B2 - Paper binding device - Google Patents

Description

  The present invention relates to a sheet binding device, a post-processing device, and an image forming apparatus.

Some image forming systems include a plurality of binding units that perform binding processing on a sheet bundle, for example, an adhesive application unit, a half-cut binding unit, a staple binding unit, and a temporary binding unit (see Patent Document 1).
In addition, as a binding machine, a plurality of stacked sheets can be bound and joined together by using cutting and raising pieces obtained by cutting and raising with a stage, a cutting blade and a punching blade. There is one that includes a compression mechanism (to be described later) that can compress and deform a joint portion in which a plurality of sheets are joined to each other in the thickness direction (see Patent Document 2).

Japanese Patent No. 3885410 JP 2010-137551 A

  An object of the present invention is to enhance the function of a tongue portion that is inserted into a cut and binds a bundle of sheets.

The invention according to claim 1 is a tongue in which a base is continuous with the sheet bundle by forming a cut in a sheet bundle formed by bundling a plurality of sheets and cutting a part of the sheet bundle into a predetermined shape. Forming a portion on the sheet bundle, bending the tongue portion, inserting the tip of the tongue portion into the notch and binding the sheet bundle, and a portion where the root of the tongue portion in the sheet bundle is formed A resin layer forming part that forms a resin layer that enhances the strength of the base, and the resin layer forming part forms the resin layer in a portion of the tongue where the root is formed, The sheet binding device includes a region where the resin layer is not formed on a tip side of a portion of the tongue portion where the root is formed.
According to a second aspect of the present invention, the resin layer forming portion is a tip side of a portion of the tongue portion where the root is formed, and is a portion that contacts the notch in the tongue portion inserted into the notch. The paper binding device according to claim 1 , wherein the resin layer is not formed on the paper binding device.
The invention according to claim 3 is characterized in that the resin layer forming portion forms the resin layer at a portion that becomes the root of the tongue portion and a portion that is between the root and the cut. The sheet binding device according to claim 1 or 2 .
The invention according to claim 4 is characterized in that the resin layer forming portion forms the resin layer at a portion that becomes the base of the tongue portion and a portion that is outside the paper from the root. The sheet binding device according to claim 1 or 2 .
The invention according to claim 5 is characterized in that the resin layer forming portion forms the resin layer at a portion which is an end portion in a direction intersecting a longitudinal direction of the tongue portion at the base of the tongue portion. The sheet binding device according to claim 1 or 2 .

According to invention of Claim 1 , compared with the case where it does not have this structure, the damage of the base of a tongue part can be suppressed.
According to invention of Claim 2 , compared with the case where it does not have this structure, the quantity of resin to be used can be suppressed.
According to the third aspect of the present invention, it is possible to suppress damage between the root of the tongue portion and the notch as the sheets of the sheet bundle are rolled, as compared with the case where the present configuration is not provided.
According to the invention described in claim 4 , as compared with the case where the present configuration is not provided, the damage between the base of the tongue and the outside of the sheet can be suppressed as the sheet of the sheet bundle is rolled. it can.
According to invention of Claim 5 , compared with the case where it does not have this structure, the quantity of resin to be used can be suppressed.

1 is a schematic configuration diagram illustrating an image forming apparatus to which the exemplary embodiment is applied. It is a schematic block diagram which shows a stapleless binding mechanism and its peripheral member. It is explanatory drawing which shows the part bound by the stapleless binding mechanism. It is a schematic block diagram which shows the sheet | seat bundle in which the binding process was performed. It is explanatory drawing which shows the binding part in this Embodiment. It is explanatory drawing which shows the binding part in other Embodiment 1. FIG. It is explanatory drawing which shows the damage location of the sheet | seat around the binding part and binding part in a comparative example. It is explanatory drawing which shows the binding part in other Embodiment 2. FIG. It is a schematic block diagram which shows the needleless binding mechanism in other Embodiment 3, and its peripheral member. It is explanatory drawing which shows the binding operation | movement of the stapleless binding mechanism in other Embodiment 3. FIG. FIG. 10 is a schematic configuration diagram illustrating an image forming apparatus according to another embodiment 4;

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<Image forming apparatus 100>
FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus 100 to which the exemplary embodiment is applied.
An image forming apparatus 100 illustrated in FIG. 1 includes, for example, an image forming unit 102 such as a printer or a copier that forms and fixes an image on a sheet S by an electrophotographic method, and a sheet on which, for example, a toner image is formed by the image forming unit 102. And a paper processing unit 103 that performs post-processing on S.

The image forming unit 102 includes a sheet supply unit 106 that supplies a sheet S on which an image is formed, an image forming mechanism (resin layer forming mechanism) 105 that forms an image on the sheet S supplied from the sheet supply unit 106 with toner. Is provided. The image forming unit 102 also includes a user interface 190 that receives information related to the binding process from the user.
The sheet processing unit 103 includes a conveyance device 110 that conveys the sheet S output from the image forming unit 102 further downstream, and a compile stacking unit 135 that collects and bundles the sheets S, a stapleless binding mechanism 150, and the like. And a processing device 130. In addition, the sheet processing unit 103 in the illustrated example includes a control unit 180 that controls the entire image forming apparatus 100.

The post-processing device 130 of the sheet processing unit 103 collects a plurality of sheets S conveyed from the conveying roll 115 and a conveying roll (sheet supply mechanism) 115 that conveys the sheet S conveyed from the conveying apparatus 110 further downstream. The compile stacking unit (sheet bundle forming mechanism) 135 accommodated as the sheet bundle B and the sheet bundle B accumulated in the compile stacking unit 135 are pressed and rotated to convey the bound sheet bundle B. And an eject roll 139.
Further, the post-processing device 130 includes a stapleless binding mechanism 150 that binds the end portion of the sheet bundle B accumulated in the compilation stacking unit 135. Furthermore, the post-processing device 130 includes an opening 169 for discharging the sheet bundle B to the outside of the post-processing device 130 by the eject roll 139. The stacker 170 stacks the sheet bundle B discharged from the opening 169 so that the user can easily take it.

<A peripheral member of the stapleless binding mechanism 150>
FIG. 2 is a schematic configuration diagram showing the needleless binding mechanism 150 and its peripheral members.
As shown in FIG. 2, the image forming apparatus 100 (see FIG. 1) includes a stapleless binding motor M <b> 1 that is controlled by the control unit 180 and drives the stapleless binding mechanism 150.
Further, the image forming apparatus 100 (see FIG. 1) receives a drive from the stapleless binding motor M1 and rotates to transmit a driving force to the stapleless binding mechanism 150, and a drive transmitted by the cam 70. And a spring 80 that applies a force opposite to the force to the stapleless binding mechanism 150.
Further, the image forming apparatus 100 (see FIG. 1) performs a binding mechanism on the sheet bundle B and a moving mechanism (not shown) that moves the stapleless binding mechanism 150 according to a position where the binding process is performed on the sheet bundle B. A rotation mechanism (not shown) that rotates the stapleless binding mechanism 150 in accordance with the direction (described later).

<Structure of needleless binding mechanism 150>
The stapleless binding mechanism (binding mechanism) 150 binds the end of the sheet bundle B by deforming the sheet S constituting the sheet bundle B without using a stapler spelling needle (so-called staple needle). Specifically, the configuration is as follows.
The stapleless binding mechanism 150 includes a base 501 and a base 503 that are arranged to face each other. As shown in FIG. 2, the sheet bundle B is bound by the base portion 503 approaching the base 501 (F1 direction in the drawing) with the sheet bundle B sandwiched between the bases 501.

  As shown in FIG. 2, the base 501 is provided with a holding member 502 arranged so as to be substantially parallel to the base 501. The base 501 and the restraining member 502 are provided with the compile stacking unit 135 (see FIG. 1) in between, and the sheet bundle B stacked on the compile stacking unit 135 includes the base 501 and the restraining member 502. Sandwiched between. As shown in FIG. 2, the base 501 has a protruding portion 506 that extends toward the base 503 and is formed integrally with the base 501.

The base 503 forms a blade 504 for cutting the sheet bundle B, and forms and bends a tongue 522 (described later) on the sheet S constituting the sheet bundle B, and inserts the tongue 522 into the notch formed by the blade 504. And a punching member 505.
The blade 504 is formed of a substantially rectangular plate-like member that extends toward the sheet bundle B sandwiched between the base 501 and the holding member 502. Specifically, the blade 504 has eye holes 504a on a substantially rectangular surface, and further has a tip 504b whose width decreases as the sheet bundle B is approached.

The punching member 505 is a member having an L-shaped bent portion. One end of the punching member 505 is a main portion 505a, and the other end is a sub-portion 505b.
The punching member 505 has a main portion rotation shaft 505r provided at an L-shaped bent portion. This punching member 505 is rotatable around a main portion rotation shaft 505r. More specifically, the main portion 505a can be inclined to the blade 504 side. Note that there is a gap between the sub-portion 505b and the base portion 503 so that the punching member 505 can rotate.

  Here, the main portion 505 a extends toward the base 501. Further, the main portion 505a has a blade portion 505c on the side opposite to the side where the main portion rotating shaft 505r is provided, that is, on the side facing the base 501. The blade portion 505c is a blade that punches out the shape of the tongue portion 522. Note that no blade is formed on the side of the blade portion 505c that faces the blade 504, and the tongue portion 522 and the sheet S are configured to be continuous by an end portion 522a described later. Further, the main portion 505 a has a protrusion 505 d extending toward the blade 504 on the side of the main portion 505 a, specifically, on the side facing the blade 504.

<Operation of Image Forming Apparatus 100>
Now, the operation of the image forming apparatus 100 will be described with reference to FIG.
First, in the present embodiment, the user interface 190 receives information related to the binding process from the user. When the control unit 180 receives information from the user interface 190, the operation of the image forming apparatus 100 is started.

  Then, a toner image is formed on the first sheet S by the image forming mechanism 105 of the image forming apparatus 100. The first sheet S on which the toner image is formed is supplied to the post-processing device 130 one by one via the transport device 110. Then, the first sheet S is received by the compiling stacking unit 135 of the post-processing device 130. The second and subsequent sheets S on which the toner image is formed by the image forming mechanism 105 following the first sheet S are sequentially supplied to the post-processing device 130. In this way, a predetermined number of sheets S are accommodated in the compilation stacking unit 135, and the end of each sheet S is aligned to form a sheet bundle B.

Next, the end of the sheet bundle B stacked on the compilation stacking unit 135 is bound by the stapleless binding mechanism 150. The bound sheet bundle B is ejected from the compiling stacking unit 135 when the eject roll 139 rotates. The sheet bundle B is discharged through the opening 169 to the stacking unit 170.
In this embodiment, the toner layer tl is formed on the binding portion 51 of the paper S by forming an image with toner by the image forming mechanism 105. The configuration of the binding portion 51 and the toner layer tl will be described later.

<Operation of Needleless Binding Mechanism 150>
Here, the operation of binding the end portion of the sheet bundle B stacked on the compiling stacking unit 135 by the stapleless binding mechanism 150 will be specifically described with reference to FIGS. 1 to 3. Here, FIG. 3 is an explanatory view showing a portion bound by the stapleless binding mechanism 150. More specifically, FIG. 3A is an explanatory diagram showing the positional relationship between the slit 521 and the tongue 522, and FIG. 3B is a diagram of the slit 521 and the tongue 522 when bound by the needleless binding mechanism 150. FIG. 3C is an explanatory view showing the front side of the binding portion 51, and FIG. 3D is an explanatory view showing the back side of the binding portion 51.
First, when a sheet bundle B to be bound is loaded on the compilation stacking unit 135, a signal from the control unit 180 is received and a moving mechanism (not shown) and a rotating mechanism (not shown) The stapleless binding mechanism 150 is moved to the position and direction for performing the binding process in the bundle B.

  At this position, the needleless binding motor M1 that has received an instruction from the control unit 180 is driven to rotate the cam 70. As a result, the base portion 503 approaches the base 501 (F1 direction in the figure), and the tip portion 504b of the blade 504 and the blade portion 505c of the punching member 505 penetrate the sheet bundle B. Then, slits (cuts) 521 and tongues 522 from which the sheet S is punched out leaving one end 522a are formed in each sheet S constituting the sheet bundle B (see FIG. 3A).

  Then, as shown in FIG. 2, when the cam 70 rotates and further presses the base 503, the sub-portion 505 b of the punching member 505 hits the protrusion 506 formed integrally with the base 501, and the punching member 505 2 rotates about the main portion rotation shaft 505r in the clockwise direction in FIG. As a result, the main portion 505 a is inclined toward the blade 504, and the protrusion 505 d of the punching member 505 approaches the blade 504. Then, as shown in FIG. 3B, the protrusion 505d of the punching member 505 bends the tongue 522 and pushes it toward the eye hole 504a of the blade 504 in the direction F2. In FIG. 3B, the punching member 505 is not shown.

  Then, as shown in FIG. 2, after the cam 70 further rotates and passes through the bottom dead center, the base 503 moves away from the base 501 while receiving the force of the spring 80 (see F3 in the figure). When the base portion 503 is raised in the direction F3 in the drawing, the tongue portion 522 is raised in a state of being caught in the eye hole 504a of the blade 504. Then, as shown in FIGS. 3C and 3D, the sheet bundle B is bound by inserting (weaving) the tongue 522 into the slit 521. At this time, a binding hole 523 is formed in the sheet bundle B where the tongue 522 is punched. In the present embodiment, the slit 521, the tongue 522, and the binding hole 523 are defined as a portion (binding portion) 51 that has been subjected to the binding process.

<Sheet bundle B subjected to binding processing>
Next, the sheet bundle B subjected to the binding process will be described with reference to FIG. Here, FIG. 4 is a schematic configuration diagram showing the sheet bundle B subjected to the binding process.
When the movement mechanism (not shown) changes the position of the stapleless binding mechanism 150 with respect to the compilation stacking unit 135, the position of the binding portion 51 in the sheet bundle B is changed. Further, by moving the position of the stapleless binding mechanism 150 by a moving mechanism (not shown) and repeating the binding operation, the number of binding portions 51 in one sheet bundle B is changed. Further, the rotation mechanism (not shown) changes the angle of the stapleless binding mechanism 150 with respect to the compile stacking unit 135, whereby the angle of the binding portion 51 in the sheet bundle B is changed.

  By driving a combination of a moving mechanism (not shown) and a rotating mechanism (not shown), for example, as shown in FIG. There is a mode in which the binding process is performed by forming the above. For example, as shown in FIG. 4B, there is an aspect in which the binding process is performed by forming two binding portions 51 along the long side of the paper S constituting the paper bundle B. Note that the position, number, angle, and the like of the binding portion 51 are not limited to the illustrated example.

<Binding portion 51>
Next, the binding portion 51 will be described more specifically with reference to FIG. Here, FIG. 5 is an explanatory view showing the binding portion 51 in the present embodiment. More specifically, FIG. 5A is an explanatory view showing the front side of the binding portion 51, FIG. 5B is an explanatory view showing the back side of the binding portion 51, and FIG. FIG. 5D is an explanatory view showing the toner layer tl formed on the back surface of the bottom page of the bundle B (the surface opposite to the surface on which the tongue 522 inserted into the slit 521 is placed), and FIG. 6 is an explanatory view showing a toner layer tl formed on the surface of the uppermost page of B (the surface on which the tongue portion 522 inserted into the slit 521 is placed). FIG.

As shown in FIGS. 5A and 5B, in the present embodiment, the front and back portions of the tongue 522 inserted into the slit 521 are each made of transparent toner (clear toner). A toner layer tl is formed.
Here, the front surface and the back surface of the tongue portion 522 come into contact with other members or portions when the binding portion 51 is formed. Specifically, when the tongue 522 is bent and pushed toward the eye hole 504a of the blade 504 (see FIG. 3B), the front and back surfaces of the tongue 522 come into contact with the blade 504. Further, when the tongue 522 is inserted (woven) into the slit 521, the front surface and the back surface of the tongue 522 come into contact with the slit 521 and the periphery thereof. Since the toner layer tl is formed on the front surface and the back surface of the tongue portion 522 that is in contact with the other members or portions, resistance caused by the contact of the tongue portion 522 is reduced. In this embodiment, the resistance generated between the tongue 522 and the blade 504 or the resistance generated between the tongue 522 and the slit 521 is reduced.

Here, the resistance which arises between the tongue part 522 and the slit 521 (and its periphery) is demonstrated as an example. First, in general, when the sheets S are in contact with each other, the dynamic friction coefficient is about 0.6. In general, the toner layer tl after being fixed to the paper S is smoothed by the melting of the toner. As a result, when the sheets S having the toner layer tl formed on the surface come into contact with each other, the dynamic friction coefficient is, for example, about 0.1 to 0.2. Therefore, as compared with the case where the toner layer tl is not formed, the resistance generated between the tongue 522 and the slit 521 (and its periphery) when the tongue 522 formed with the toner layer tl is inserted into the slit 521. Becomes smaller. That is, the insertion of the tongue 522 into the slit 521 becomes smoother.
By smoothly inserting the tongue 522 into the slit 521, the tongue 522 is more reliably inserted into the slit 521. In addition, since the tongue 522 is smoothly inserted into the slit 521, the tongue 522 and the slit 521 are prevented from being damaged when the tongue 522 is inserted into the slit 521.

  In general, the toner layer tl after being fixed to the paper S is in a state where the toner is melted and there is no gap, that is, the surface of the paper S is coated, and the toner layer tl is formed. The strength of is increased (reinforced). In the illustrated example, the strength of the tongue 522 on which the toner layer tl is formed increases. This reduces damage to the tongue 522 due to the binding operation. In particular, damage such as tearing of the tongue 522 when the tongue 522 is pushed into the eye hole 504a of the blade 504 or when the tongue 522 is inserted into the slit 521 is reduced.

Next, the operation for forming the toner layer tl on the front and back surfaces of the tongue 522 will be described.
First, as described above, the user interface 190 receives information related to the binding process from the user. Specifically, the user interface 190 receives information regarding the position and angle at which the binding portion 51 is formed on the sheet bundle B. Based on this instruction, the control unit 180 instructs the image forming mechanism 105 to form the toner layer tl at a position corresponding to the binding portion 51 (the portion forming the tongue portion 522 in the illustrated example) on the paper S. put out.

Then, as shown in FIG. 5C, the image forming mechanism 105 detects that the sheet S that is the bottom page of the sheet bundle B among the sheets S supplied from the sheet supply unit 106 passes through FIG. The toner layer tl is formed on the entire surface where the tongue 522 is to be formed, which is the lower surface Bt of the sheet bundle B in FIG. Further, as shown in FIG. 5D, the image forming mechanism 105 is configured so that when the sheet S that is the uppermost page of the sheet bundle B among the sheets S supplied from the sheet supply unit 106 passes, A toner layer tl is formed on the entire surface where the tongue 522 is to be formed, which is the upper surface Bh of the sheet bundle B in a).
Each of the portions of the sheet bundle B where the tongue portion 522 is to be formed is formed on the bottom surface of the bottom page (lower side surface Bt in FIG. 5A) and the top surface of the top page (upper side surface Bh in FIG. 5A). The sheet bundle B on which the toner layer tl is formed is bound by the stapleless binding mechanism 150. As a result, the toner layer tl is formed on the front and back surfaces of the tongue 522.

  In the above description, the toner layer tl is described as being formed on the portion where the tongue 522 is to be formed only on the uppermost page and the lowermost page of the sheet bundle B. However, the present invention is not limited to this. The toner layer tl may be formed at a position corresponding to the binding portion 51 in each of the other sheets S (an intermediate sheet S sandwiched between the uppermost page and the lowermost page of the sheet bundle B) in the sheet bundle B. It is suppressed that the part which forms the binding part 51 in the intermediate paper S is damaged.

In the above description, the toner layer tl is described as being formed from a transparent toner (clear toner). However, the present invention is not limited to this. For example, it may be formed from colored toner such as yellow (Y), magenta (M), cyan (C), and black (K).
In the above description, the toner layer tl is formed on the front surface and the back surface of the tongue 522. However, the present invention is not limited to this. The toner layer tl may be formed only on either the front surface of the tongue 522 or the back surface of the tongue 522.

<Other embodiment 1>
In the above-described embodiment, it has been described that the toner layer tl is formed on the entire portion where the tongue portion 522 is formed. However, the present invention is not limited to this. Another embodiment 1 will be described with reference to FIG. Here, FIG. 6 is an explanatory view showing a binding portion 51 in another embodiment 1. FIG.

  First, as shown in FIG. 6A, the toner layer tl may be formed on a part of the tongue 522. Specifically, the toner layer tl is formed only at the tip of the tongue 522, and the toner layer tl is not formed at any part other than the tip of the tongue 522 (at the root, one end 522 a side). By forming the toner layer tl at the tip of the tongue 522, the insertion of the tongue 522 into the slit 521 becomes smooth, and the base of the tongue 522 is brought into a state where the sheets S with higher friction come into contact with each other. The tongue portion 522 inserted into the slit 521 is not easily removed from the slit 521.

  Further, as shown in FIG. 6B, a configuration in which a toner layer tl is formed around the slit 521 and the tongue 522 may be employed. In addition to smooth insertion of the tongue portion 522, the strength of the periphery of the slit 521 and the tongue portion 522, which are particularly susceptible to damage, is improved, and damage to the periphery of the slit 521 and the tongue portion 522 is suppressed. The

  Further, as illustrated in FIG. 6C, a configuration in which the toner layer tl is formed on the entire binding portion 51 may be employed. In addition to the smooth insertion of the tongue 522, the periphery of the tongue 522 is coated and the strength of the binding portion 51 is improved. For example, even when a load is applied to the slit 521 into which the tongue 522 is inserted or the binding hole 523 through which the file binding tool (not shown) can be passed when the sheet bundle B is handled, it can be damaged. It is suppressed.

<Other embodiment 2>
Next, another embodiment 2 will be described with reference to FIGS. Here, FIG. 7 is an explanatory diagram showing the binding portion 51 and the damage of the paper S around the binding portion 51 in the comparative example. In FIG. 7, the damaged portion of the paper S is shown in a colored manner. FIG. 8 is an explanatory view showing a binding portion 51 in another embodiment 2.

First, unlike the present embodiment, as a comparative example, damage to the sheet S in the sheet bundle B in which the toner layer tl is not formed in the binding portion 51 will be described.
When the sheet bundle B is opened by the user, the sheet S is rolled from the center side of the sheet S in a state where a part of the sheet S constituting the sheet bundle B is picked.
At this time, for example, as shown in FIG. 7A, when the paper S is rolled in a direction intersecting with the longitudinal direction of the tongue 522 (direction R1 in the figure), the tongue 522 is a portion continuous with the paper S. Damage may occur at one end 522a of the tongue 522 or around it. More specifically, damage may occur in a portion outside the sheet S (downstream in the R1 direction in the drawing) from the one end 522a of the tongue 522, starting from the one end 522a of the tongue 522.

  Further, as shown in FIG. 7B, for example, the sheet S is in a direction along the longitudinal direction of the tongue 522 and in a direction from the binding hole 523 side toward the tip end side of the tongue 522 (R2 direction in the drawing). When angling, damage may occur at one end 522a of the tongue 522 or around it. More specifically, damage may occur in a portion closer to the slit 521 than the one end 522a of the tongue 522, starting from the one end 522a side of the tongue 522.

In other words, stress may concentrate on both ends of the end portion 522a of the tongue portion 522 (see the end portion 522b in the direction intersecting the longitudinal direction of the tongue portion 522) when the paper S is rolled by the user. Accordingly, as shown in FIGS. 7A and 7B, the sheet S can be damaged starting from the end 522 b of the tongue 522.
Further, the binding of the sheet bundle B can be removed by causing damage at one end 522a of the tongue 522 or around the one end 522a.

Therefore, in another embodiment 2, a toner layer tl is formed on one end 522a of the tongue 522, as shown in FIG. In the example shown in FIG. 8A, one end 522 a of the tongue 522, a portion outside the sheet S from the one end 522 a of the tongue 522, and a slit 521 than the one end 522 a of the tongue 522. A toner layer tl is formed in the area of the sheet S including the side portion. More specifically, in the example shown in FIG. 8A, the toner layer tl formed in each portion is continuous.
The strength is improved (reinforced) by forming the toner layer tl. This suppresses the occurrence of damage around the one end 522a of the tongue 522 when the user rolls the paper S.

Further, as shown in FIG. 8B, a configuration in which a toner layer tl is formed on the end 522b of the tongue 522 may be employed. As described above, the sheet S can be damaged by reinforcing the portion where the stress tends to concentrate when the sheet S is rolled by the user. Unlike the illustrated example, the toner layer tl may be formed on either one of the end portions 522b of the tongue portion 522.
Now, as shown in FIG. 8A and FIG. 8B, the amount of toner used is suppressed by forming the toner layer tl by restricting it to one end 522a of the tongue 522 or its periphery. The

<Other embodiment 3>
Here, another embodiment 3 will be described with reference to FIG. Here, FIG. 9 is a schematic configuration diagram showing a needleless binding mechanism 500 and its peripheral members in another embodiment 3. More specifically, FIG. 9A is a front view of the needleless binding mechanism 500 and its peripheral members, and FIG. 9B is a bottom view of the needleless binding mechanism 500 and its peripheral members.

The stapleless binding mechanism 500 in this embodiment includes a punching member 515 that forms a tongue 522 on a sheet S that is provided in the base 503 and forms the sheet bundle B. This punching member 515 has a blade portion 515 c on the side facing the base 501.
Further, a push-in mechanism 515 d is provided inside the punching member 515 and pushes the tongue 522 toward the eye hole 504 a of the blade 504. The pushing mechanism 515d has a rotation shaft 515r provided at one end. The push-in mechanism 515d can rotate around the rotation shaft 515r.
The needleless binding mechanism 500 includes a pressing portion 516 that is provided inside the punching member 515 and presses the pressing mechanism 515d.

  Furthermore, in the present embodiment, a first cam 701 is provided that moves the base 503 by being driven by the needleless binding motor M1 and rotating. In addition, a second cam 703 is provided that is driven by the needleless binding motor M1 and rotates to move the pressing portion 516 toward the pressing mechanism 515d. In the illustrated example, a first cam 701 and a second cam 703 are provided on a common shaft 705, and the shaft 705 is driven by a needleless binding motor M1 and rotates. As shown in the figure, the second cam 703 has a larger pushing amount than the first cam 701.

Next, the binding operation of the present embodiment will be described with reference to FIGS. 9 and 10. Here, FIG. 10 is an explanatory view showing the binding operation of the stapleless binding mechanism 500 in the other embodiment 3. Note that the slits 521 and the tongue 522 indicated by broken lines on the paper S in FIG.
As shown in FIG. 9A, the needleless binding motor M1 is driven to rotate the shaft 705 provided with the first cam 701 and the second cam 703. As a result, the base 503 driven by the first cam 701 approaches the base 501 (F1 direction in the figure). The leading end portion 504b of the blade 504 and the blade portion 515c of the punching member 515 pass through the sheet bundle B. Then, as shown in FIG. 10 (b), slits (cuts) 521 and tongues 522 from which the sheet S is punched out with one end 522a formed are formed on each sheet S constituting the sheet bundle B. The

  On the other hand, after the leading end portion 504b of the blade 504 and the blade portion 515c of the punching member 515 penetrate the sheet bundle B, the second cam 703 further rotates and moves the pressing portion 516 toward the pushing mechanism 515d (FIG. 9 (a) F1 direction). As a result, the push-in mechanism 515d rotates around a rotation shaft 515r provided at one end of the push-in mechanism 515d, and the other end of the push-in mechanism 515d directs the punched tongue 522 toward the eye hole 504a of the blade 504. Push in (direction F2 in FIG. 10B).

After the first cam 701 and the second cam 703 further rotate and pass through the bottom dead center, the base 503 moves away from the base 501 while receiving the force of the spring 80, and the tongue 522 is inserted into the slit 521. (Weaving).
Also in this embodiment, similarly to the above-described embodiment, the toner layer tl is formed on the front surface and the back surface of the tongue portion 522 inserted into the slit 521, respectively.

<Other embodiment 4>
In the above-described embodiment, the toner layer tl is formed on the binding portion 51. However, the present invention is not limited to this. Another embodiment 4 will be described with reference to FIG. Here, FIG. 11 is a schematic configuration diagram showing an image forming apparatus 100 according to another embodiment 4.
In the fourth embodiment, as an alternative to the toner layer tl, a layer containing, for example, a vinyl resin or an acrylic resin is formed on the binding portion 51.

In the illustrated example, the post-processing device 130 includes a resin layer forming unit 195 that includes a coating roll that applies resin to the paper S supplied from the upstream side, and a resin cooling unit that cures and dries the resin applied to the paper S. 197 on the upstream side of the sheet conveyance with respect to the compiling stacking unit 135. Here, the resin layer forming unit 195 and the resin cooling unit 197 are examples of a resin layer forming mechanism.
The resin layer forming portion 195 applies a resin layer to a portion where the tongue portion 522 is formed in the surface serving as the lower side surface Bt in FIG. 5A when the sheet S serving as the bottom page of the sheet bundle B passes. Form. Further, the resin layer forming portion 195 has a resin layer on a portion where the tongue portion 522 is formed in the surface which becomes the upper side surface Bh in FIG. 5A when the sheet S which is the uppermost page of the sheet bundle B passes. Form.

The resin layer is formed on the front and back surfaces of the tongue 522, so that the insertion of the tongue 522 becomes smooth. Further, damage to the tongue 522 is reduced.
In the illustrated example, the sheet processing unit 103 includes the resin layer forming unit 195 and the resin cooling unit 197. However, if the sheet processing unit 103 is on the upstream side of the sheet conveyance with respect to the compilation stacking unit 135, for example, 110 may have a resin layer forming part 195 and a resin cooling part 197.
The resin applied to the front and back surfaces of the tongue 522 may be applied by other well-known methods such as a bar coater, a spray method, an ink jet method, and a blade method.

  In the illustrated example, the image forming apparatus 100 including the image forming mechanism 105 has been described. However, the present invention is not limited to this. For example, an image reading apparatus provided with a mechanism for reading an image of a document may be configured to include a resin layer forming unit 195, a resin cooling unit 197, a needleless binding mechanism 150, and the like.

DESCRIPTION OF SYMBOLS 51 ... Binding part, 70 ... Cam, 100 ... Image forming apparatus, 102 ... Image forming part, 130 ... Post-processing apparatus, 150 ... Needleless binding mechanism, 501 ... Base, 503 ... Base, 504 ... Blade, 505 ... Punching Member, 521... Slit, 522 ... Tongue, B ... Paper bundle, M1 ... Needleless binding motor, S ... Paper, tl ... Toner layer

Claims (5)

A notch is formed in a sheet bundle formed by bundling a plurality of sheets, and a part of the sheet bundle is cut into a predetermined shape to form a tongue portion whose root is continuous with the sheet bundle in the sheet bundle. And a binding part that bends the tongue part and inserts the tip of the tongue part into the notch and binds the sheet bundle;
A resin layer forming portion that forms a resin layer that increases the strength of the root at a portion where the root of the tongue is formed in the sheet bundle;
The resin layer forming portion forms the resin layer at a portion of the tongue where the root is formed, but does not form the resin layer at the tip side of the portion of the tongue where the root is formed. A sheet binding device including an area. The resin layer forming portion is not on the tip side of the portion of the tongue where the base is formed, and does not form the resin layer on a portion of the tongue that is inserted into the cut and in contact with the cut. The sheet binding device according to claim 1 . 3. The paper according to claim 1, wherein the resin layer forming portion forms the resin layer at a portion that becomes the root of the tongue and a portion that is between the root and the notch. Binding device. 3. The paper according to claim 1, wherein the resin layer forming portion forms the resin layer on a portion of the tongue that is the base and a portion that is outside the paper from the base. Binding device. 3. The paper according to claim 1 , wherein the resin layer forming portion forms the resin layer at a portion that is an end portion in a direction intersecting a longitudinal direction of the tongue portion at the base of the tongue portion. Binding device.

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