JPH08244381A - Bookbinding apparatus - Google Patents

Abstract

PURPOSE: To prevent offsetting of the color toner of a color sheet in a sheet bundle to other sheet material due to melting in a bookbinding apparatus which laminates an adhesive tape coated with heat meltable adhesive on the back of the bundle to bundle a plurality of sheet materials. CONSTITUTION: Heat meltable adhesive layers T2 , T3 are provided on a base layer T1 , and heated and bonded to the back Ss of a sheet bundle S. At this time, the center Ts of the tape T is heated by a back surface heater 12s, and both the ends Ta, Tb are heated by side heaters 12a, 12b. If the bundle S is thin, the temperatures of the bonding surfaces B become high by the influence of the heater 12s, and hence there is a fear that the color toner of the sheet Sc is melted. In order to prevent it, if the number of the sheet materials for forming the bundle S is, for example, less than a predetermined number, the set heating temperature of the heater 12s is controlled to be lower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bookbinding apparatus in which an adhesive tape coated with a heat-melting adhesive is attached to the back of a sheet bundle to bundle a plurality of sheet materials.

[0002]

2. Description of the Related Art Conventionally, there is known a bookbinding apparatus for binding a sheet material by winding an adhesive tape around the back portion of a sheet bundle composed of a plurality of sheet materials over its entire length.

The adhesive tape used in this bookbinding apparatus is formed slightly wider than the thickness of the sheet bundle, and a heat-melting adhesive agent is applied to the surface on the side to be adhered to the sheet bundle. .

In bookbinding, first, the center of the adhesive tape is applied to the back of the sheet bundle in the width direction, heating and pressurization by the back heating member is started, and both ends of the adhesive tape protruding from the back of the sheet bundle are respectively pressed. Fold the front side and the rear side of the sheet bundle. Then, the folded both ends are heated and pressed by sandwiching the sheet bundle by the side heating members. By heating and pressurizing these,
The adhesive is melted and fixed, and the adhesive tape is adhered to the back and front and back surfaces of the sheet bundle in a U-shaped cross section to bundle the entire sheet bundle. In FIG. 12, the adhesive surface after heating is started, that is, the surface of the back portion to which the central portion of the adhesive tape is adhered (hereinafter referred to as “adhesive surface A”), and both ends of the adhesive tape on the front surface side and the back surface side of the sheet bundle are adhered. The temperature change on the surface to be treated (hereinafter referred to as "adhesion surface B") is shown. The surface temperature of the back heating member and the side heating member described above is adjusted to a constant set temperature T _R by controlling the energization time by a temperature control circuit (not shown). The above-mentioned adhesive surface A is heated mainly by the back heating member, while
The bonding surface B is mainly heated by the side heating member. There is a time difference t ₁ between the temperature rising start times of both the adhesive surfaces A and B, because the heating of the adhesive surface A by the back heating member is started and then the heating of the adhesive surface B by the side heating member is started. This is because it is necessary to bend both end portions of the adhesive tape before the process. In the figure, the temperature T _M is the softening point of the adhesive, and the times t _A and t _B show the times until the adhesive surfaces A and B reach the softening point of the adhesive, respectively. Even after softening
Heating is continued until time t _S to complete the bond.
After time t _S , the sheet bundle is separated from the back heating member and the side heating member, and the binding of the sheet bundle is completed.

By the way, a plurality of sheet materials before binding (hereinafter referred to as "base sheets") are thick sheets such as a front cover and a back cover, and a base sheet such as a pictorial sheet produced by a color copying machine. Different insertion sheets may be inserted, and these insertion sheets are bound together with the base sheet by heating and pressing the adhesive tape.

[0006]

However, according to the above-mentioned prior art, when the insertion sheet is a pictorial sheet using color toner (hereinafter referred to as "color sheet"), the image forming area is wide and the above-mentioned adhesive tape is used. In some cases, an image is formed even in a portion corresponding to the end portion of, and the amount of color toner may be large. Therefore, when the insertion position of the color sheet is close to the front cover or the back cover, the color toner on the color sheet is melted by being strongly affected by the heat of the side heating member, and is transferred to the adjacent sheet material. So-called offset may occur. This is because the melting temperature (glass transition temperature) of the color toner is generally set lower than that of the black toner in consideration of color reproducibility and the like.

In order to prevent this offset, the set temperature T _RS of the side heating member is set lower than the offset start temperature T _OFS of the color toner, and the softening point T _MS of the end adhesive of the adhesive tape is set. It is conceivable to set the temperature lower than the set temperature T _RS of the side heating member. This allows
If the number of base sheets is large and the sheet bundle is thick,
As shown by the solid line in FIG. 13, the temperature of the bonding surface B can be suppressed to be lower than the set temperature T _RS of the side heating member.

However, when the number of base sheets is small, the adhesive surface B is affected by the back heating member and becomes higher than the set temperature T _{RS as} shown by the chain line in FIG. Depending on the insertion position of the color toner, the color toner exceeds the offset start temperature T _OFS , which causes a problem that the color toner is offset.

Therefore, it is an object of the present invention to provide a bookbinding apparatus which prevents color toner offset and performs high-quality bookbinding.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and forms a sheet bundle by a plurality of laminated base sheets and an insertion sheet inserted into these base sheets. A heating means for heating the adhesive tape in a bookbinding apparatus in which the adhesive tape coated with a heat-melting adhesive is heat-pressed to the spine of the sheet bundle to bundle the sheet bundle; Control means for controlling the heating set temperature of the means, and the control means determines the heating set temperature of the heating means according to the number of the base sheets constituting the sheet bundle and the property of the insertion sheet. , Is characterized.

In this case, the control means sets the heating set temperature to be low when the number of the base sheets is less than a predetermined number and the insertion sheet is an insertion sheet image-formed with low melting toner. Good to do.

With respect to the base sheets forming the sheet bundle, a predetermined number of sheets from the front surface side to a front surface area, a predetermined number of sheets from the back surface side to a back surface area, and an area between the front surface area and the back surface area are defined. In the case of the intermediate region, the control means is such that at least one of the insertion sheets belongs to at least one of the front surface region and the back surface region, and the insertion sheet is an insertion sheet image-formed with low melting toner. In addition, the heating set temperature may be set low.

Further, the heating means heats a back portion heating member for heating a central portion of the adhesive tape, which is adhered to the back portion of the sheet bundle, and an end portion of the sheet bundle, which is folded to the front surface side and the back surface side. And a side heating member for controlling the heating temperature of the back heating member and the side heating member.

In addition, the heating set temperature of at least one of the back heating member and the side heating member may be set low.

Next, each of the back heating member and the side heating member has a low heat capacity heating element provided with an insulating substrate and a thick film resistor formed by screen-printing a heating element on the insulating substrate. can do.

[0016]

Based on the above-mentioned structure, the control means, depending on the number of base sheets and the properties of the insertion sheet, for example, the number of sheets is less than a predetermined number, and the insertion sheet has a low melting toner (toner having a low melting temperature. When the heating temperature is set low when the image is formed by the following), the low melting toner is prevented from melting and turning off to the adjacent sheet material.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 12 and 13 and the drawings referred to below, the same structurally and functionally similar members are designated by the same reference numerals, and duplicate description thereof will be omitted. <Embodiment 1> FIG. 1 shows a bookbinding apparatus mounted as a post-processing apparatus of an image forming apparatus such as a copying machine.

The bookbinding apparatus 100 includes an inserter 200.
And a sorter 300 together with a post-processing device, for example,
It is used in combination with the copying machine main body 500. The copying machine main body 500 includes an automatic document feeder 501 and a sheet material feeding device 502. Further, an image forming unit for forming a toner image on a sheet material such as paper with black toner, and this toner are provided inside. A fixing unit (neither is shown) for melting and fixing the image on the sheet material by heating and pressing is provided.

Hereinafter, a case where 10 copies (image formation) are performed on one side from an original of pages 1 to 20 will be described as an example. The sheet material on which the toner image of black toner is formed by the copying machine body 500 is referred to as a base sheet, and the sheet material inserted into the base sheet by the inserter 200 is referred to as an insertion sheet. I shall.

The document placed on the automatic document feeder 501 is sequentially fed to the image reading section (not shown) for each of pages 20 to 1 and the sheet material fed from the sheet material feeder 502. On the other hand, 10 copies are made for each page. As a result, on the sorter 300,
Base sheets S _{1 to} S in a page-assembled form from 1 to 20 pages
₂₀ copies (see FIG. 2) are output. The insert sheet is inserted by the inserter 200 described above into any position of the base sheets S _{1 to} S ₂₀ . The insert sheet, for example, cover Sa, back cover Sb like cardboard, furthermore, there is a color copy Sc such as a photograph, before the base sheet S ₂₀ of the back cover Sb is 20 pages are output, color copy S _S is inserted between arbitrary base sheets, and further, the cover sheet Sa is inserted after discharging one page of the base sheet S ₁ . In this way, the base sheet S of pages 1 to 20 is placed on the sorter 300.
_{1 to} S ₂₀ and the insertion sheets Sa, Sb, Sc
A sheet bundle S of 10 sets is formed.

Each sheet bundle S on the sorter 300 is held by a sheet bundle holding mechanism (not shown), and an adhesive tape T is wound around the spine Ss by the bookbinding apparatus 100 shown in FIG. In addition, in FIG. 2, the spine Ss of the sheet bundle S, the cover Sa,
An adhesive tape T wound in a U shape on the back cover Sb,
3 shows a sectional view of the sheet bundle S, and FIG. 3 shows an enlarged sectional view of the adhesive tape T before being bonded.

The adhesive tape T is a hot-melt adhesive tape composed of three layers of a base layer T ₁ and glue layers (adhesives) T ₂ and T ₃ having different widths. Base layer T ₁
Is formed of a cellulose fiber paper having a thickness of about 100 μm, and each of the glue layers T ₂ and T ₃ is composed of a heat-melting adhesive having a layer thickness of 400 μm and 50 μm, respectively. The adhesive tape T at the time of bookbinding has a U-shape as shown in FIG. 2 by a tape bending mechanism (not shown).
That is, the central portion Ts corresponding to the back portion Ss of the sheet bundle S
And continuously with this, the front cover Sa side and the back cover S
It is formed in a U-shape having ends Ta and Tb folded to the side b. The adhesive tape T bundles the sheet bundle S by being heated and pressed by the heating means 10. The heating means 10 includes a central portion Ts of the adhesive tape T, a back portion heating member 11s for heating and pressing the adhesive surface A of the back portion Ss, and end portions Ta, T of the adhesive tape T that move in the arrow directions in the figure.
b, the side surface heating member 11a for heating and pressing the adhesive surfaces B, B,
11b, and the back heater 12s and the side heaters 12a and 12b are respectively provided as heating elements.
The adhesive tape T is fixed to the sheet bundle S by the heat generation of the heaters 12s, 12a, 12b and the heating and pressurization of the heating members 11s, 11a, 11b. At this time, the back heating member 11s mainly melts the narrow glue layer T ₃ and a portion of the wide glue layer T ₂ corresponding to the glue layer T ₃ via the central portion Ts of the adhesive tape T. Then, the central portion Ts of the adhesive tape T is attached to the back portion Ss of the sheet bundle S. On the other hand, the side heating members 11a and 11b are connected to the end portions Ta and T of the adhesive tape T.
b is heated to mainly melt both ends of the wide glue layer T ₂ .
Attach both ends Ta and Tb of the adhesive tape T to the cover sheet S of the sheet bundle S.
The sheet is affixed so as to be folded to the side a and the back cover Sb side.

When the adhesive tape T is attached, the heating members 11s, 11a and 11b described above are controlled to appropriate temperatures by the temperature sensor and the control device.

Next, the temperature control of the bookbinding apparatus 100 having the above-mentioned configuration will be described by giving specific numerical values.

First, in the above-mentioned three-layer hot-melt type adhesive tape (hereinafter referred to as "glue tape") T, the width of the base layer T ₁ (the total of the central portion Ts and both end portions Ta and Tb) is 4 cm. , Use a length of 30 cm. Base layer T
The _1, a softening point of 100 ° C. of the adhesive layer T _3, also the adhesive layer T ₂ that is set softening point in consideration of the offset temperature and storage time environment color sheet below to 70 ° C. is applied .

FIG. 4 shows a block diagram of the entire bookbinding apparatus.

In the figure, S is a sheet bundle and T is a glue tape. Further, 12s indicates a back surface heater, 12a and 12b indicate side surface heaters, and thermistors 13s, 13a and 13b for detecting respective temperatures are attached to these. Each of the heaters 12s, 12a, and 12b described above is a thick film heater in which a heating element is formed on an alumina substrate by screen printing, and has a small heat capacity to enable high-speed and accurate temperature adjustment. 14s is a back heater 12s
A driving mechanism for driving the side heater 14a.
It is a drive mechanism for driving 2a and 12b. Reference numeral 15 denotes both ends of the glue tape T on the front cover Sa side and the back cover Sb.
Bending mechanism for folding to the side, 16 is a roll-shaped glue tape supply roll, 17 is a bundle generation unit that stores the sheet bundle S page-set by the sorter 300, 18 is a bundle that holds the unbonded sheet bundle S A holding mechanism for setting the sheet bundle S from the portion 17 to the adhesion portion and taking out the sheet bundle S after the adhesion from the adhesion portion to the bundle generation portion 17.

Reference numeral 21 denotes a back heater 12s, side heaters 12a, 12 based on the bookbinding conditions and other information input from the bookbinding apparatus 100 via the interface circuit 22.
A microprocessor for controlling the temperature of b and the operation of the drive mechanisms 14s and 14a, 23 is a regulator for generating DC power required in the bookbinding apparatus 100 from AC power supplied from the outside, and 24 is supplied to the back heater 12s. A rear surface heater power control circuit for controlling electric power, 25 a side surface heater control circuit for controlling electric power supplied to the side surface heaters 12a, 12b, and 26a, 26b store different temperature control programs and data for the rear surface heaters. The ROM 27 is a ROM in which the side heater temperature control program, data, and the like are stored.

Reference numeral 51 on the copying machine body 500 side is an interface circuit for communicating with an external device, 52 is a CPU for controlling the copying machine body 500, and 53 is a setting of the copying machine body 500 and the bookbinding apparatus 100. This is the operation panel to perform.

Next, the operation of the bookbinding apparatus 100 will be described with reference to the flowchart of FIG.

When bookbinding is performed using the bookbinding apparatus 100 after image formation by the copying machine body 500, the apparatus body 5
For example, the following settings are made by the operation panel 53 of 00. The number of base sheets forming the sheet bundle S (hereinafter referred to as “sheet number”) m In addition to counting the number of sheets in advance, for example,
It can also be automatically detected by the automatic document feeder. Total number of bundles of sheet bundle S Presence / absence of insertion sheet and properties, insertion page of which page of insertion sheet to insert insert sheet Here, when inserter 200 is installed, Is, for example, an OHP sheet, a color copy, a cardboard used as a front cover or a back cover, and the like. In addition, the page in which the insertion sheet is inserted is input by designating the insertion page.

In FIG. 5, when the setting input is made by the operation panel 53 (S1) and the bookbinding process is not performed, the process proceeds to the non-bookbinding process (S2, S3). On the other hand, when performing the bookbinding process, the CPU 52 compares and calculates the magnitude relationship between the number m of the base sheets forming the sheet bundle S and the preset value M (S4). Here, the set value M is the number of sheets m when the temperature of the back surface heater 12s affects the above-mentioned bonding surface B, and is a value preset in the CPU 52. Prior to FIG.
As described above, when the number of sheets m is large and the sheet bundle S is thick, since the heat capacity of the sheet bundle S is large, the temperature of the bonding surface B is equal to or higher than the set temperature T _RS of the side surface heaters 12a and 12b. However, when the number of sheets m is small and the heat capacity of the sheet bundle S is small, the bonding surface B is affected by the back surface heater 12s and the side surface heaters 12a, 12a.
The temperature exceeds the set temperature T _{RS of} b. FIG. 6 is a diagram showing the relationship between the number of sheets m and the maximum reached temperature of the bonding surface B within the bonding time. In the figure, S ₁ is the minimum number of sheets, for example 15 sheets, and S ₂ is the maximum number of sheets, for example 200 sheets. As the number of sheets m decreases,
If the temperature of the bonding surface B rises and is below a certain number, it will be above the set temperature T _RS of the side surface heaters 12a and 12b.
The number of sheets at this time is M.

When the number of sheets m is less than or equal to the above M, (S
In step 4), the process proceeds to the temperature control B (S5) to control the temperature of the default rear heater 12s set in the ROM 26a of FIG. That is, with respect to the softening point 100 ° C. of the adhesive layer T ₃ of the glue tape T and the softening point 70 ° C. of the adhesive layer B, the temperature control set temperature T _R1 of the rear heater 12s is set to 150 ° C. Perform the key. Side heaters 12a, 12 at this time
The set temperature T _{R2 of} b is set to 80 ° C., and temperature control is similarly performed within a range of ± 5 ° C.

If the number of sheets m is smaller than M in step 4, it is determined whether a color sheet is inserted as an insertion sheet (S6). Here, when the insertion of the color sheet is not set in the setting of step 1, the process proceeds to step 5 and the above-mentioned temperature adjustment B is performed. on the other hand,
When the insertion of the color sheet is set, temperature control A is performed (S7).

In step 7, the control of the back heater 12s is changed in order to prevent the color toner on the color sheet from being offset to the adjacent sheet material. Since this control is written in the ROM 26b in FIG. 4, the microprocessor 21 immediately switches the temperature control from the ROM 26a to the ROM 26b when the microprocessor 21 receives the information from the CPU 52 input from the interface circuit 22. In this control, for example, the set temperature T _R1 of the back heater 12s is set to 1
The temperature shall be 20 ° C and the temperature control shall be ± 5 ° C. On the other hand, the set temperature T _R2 of the side surface heaters 12a and 12b is set to 80 ° C., which is the same as that in step 5. FIG. 7 shows the temperature rise characteristics of the adhesive surfaces A and B at this time. Since the number of sheets m is small, the rise time of the temperature is fast, and the back heater 12s
Even if the set temperature is lowered, the adhesive of the adhesive layer T ₃ is sufficiently melted, and the temperature rise of the adhesive surface B is higher than that when the set temperature of the back surface heater 12s is not changed (shown by the broken line in the figure). As a result, the color toner becomes lower, and thus offset of the color toner can be prevented within the adhesion required time t _S.

Since the back heater 12s described above has a small heat capacity, for example, a sheet bundle S in which color sheets are not inserted is used.
Even in the case where the sheet bundle S in which the color sheets are inserted and the sheet bundle S in which the color sheets are inserted are created alternately, a sufficient response is possible.

In this way, after the ROM is selected,
When a start button (not shown) is pressed on the operation panel 53, a predetermined number of copies are made in the copying machine main body 500, but the properties of the inserted sheet and the information of the inserted page of the inserted sheet are stored in the CPU of the inserter 200. (Not shown), the insert sheet is inserted into the sorter 300 from the inserter 200.
Supplied on a specific page of sheet material above.

When the predetermined number of sheets m and the inserted sheets are stocked in the bundle generating unit 17 of the bookbinding apparatus 100, the holding mechanism 18 takes out the sheet bundle S from the bundle generating unit 17,
The sheet bundle S is held at a predetermined heating position. At this time, the glue tape T is supplied from the glue tape supply roll 16 and cut into a predetermined length by a tape cutting mechanism (not shown). The glue tape T that has been cut off is the back heater 1
It is supplied to 2s and both ends T by the bending mechanism 15.
The a and Tb are bent to the front surface side and the back surface side of the sheet bundle S. Subsequently, the microprocessor 21 drives the back surface heater 12s via the drive mechanism 24 to press the central portion Ts of the glue tape T onto the spine portion Ss of the sheet bundle S, and through the drive mechanism 25 the side surface heaters 12a, 12b. Is driven to press both ends Ta and Tb of the glue tape T to the front surface side and the back surface side of the sheet bundle S.

Back heater 12s, side heaters 12a, 1
The heating time by 2b is adjusted to the copying speed (copy speed) so as not to impair the productivity of the copying machine main body 500. Copy speed of copier body 500 is 1
If 20 copies / min, the number of sheets in the sheet bundle S is m
The time required to copy 15 to 200 sheets is 7.
5 to 100 seconds, and in the above operation, the back heater 1
Considering the time for 2s to contact the glue tape T and the time for discharging (several seconds), the number of sheets is 30 (required time 1
At least 5 seconds), we will be able to achieve 100% productivity. Melting start and the time to the adhesive of the adhesive layer T ₃ glue tape T at the controlled temperature of the aforementioned rear heater 12s is about 8 seconds at 30 sheets number of sheets, the number of sheets m is in the range of 30 to 200 sheets Is sufficient, and bookbinding that can follow the copying speed is possible.

The sheet bundle S is removed from the heating position by the holding mechanism 18 after a predetermined adhesive pressing time (t _{S in} FIG. 7) according to the number of sheets m has elapsed, and then the stacker in the bookbinding apparatus 100 or the outside. Is output to a stacker (not shown). <Embodiment 2> In Embodiment 1, when the number m of base sheets forming the sheet bundle S is equal to or less than a predetermined value M and a color sheet is inserted, the temperature control of the back heater 12s is changed. However, instead of this, the side heater 1
The temperature control of 2a and 12b may be changed. In this case, two side heater ROMs are provided.

Further, the temperature control program does not need to be limited to two, and the threshold of the number of sheets (threshold) is set to M.
It is also possible to set two or more, such as ₁ , M ₂ , M _3, ..., And prepare a plurality of ROMs accordingly. ROM
Was set outside the microprocessor 21, but ROM
Alternatively, if a one-chip microcomputer with a built-in RAM is used, it is not necessary to prepare it externally.

Further, the set value M may be arbitrarily set by the user from the operation panel 53. As shown in FIG. 8, a temperature sensor 31 and a humidity sensor 32 are provided in the bookbinding apparatus 100, and temperature / humidity data is arithmetically processed according to a program preset in the microprocessor 21, for example, as shown in FIG. Area Q
Since (off high temperature and high humidity) tends to cause offset,
The optimum value M for the environment may be set, for example, by setting the setting value M to be small. <Third Embodiment> In the first embodiment, the temperature control of the rear heater 12s is switched according to the number of sheets m of the base sheets forming the sheet bundle S, but according to the position where the color sheet is inserted. The temperature control may be switched.

For example, as shown in FIG. 10, in the sheet bundle S, a predetermined number of sheets from the front surface side are referred to as a front surface area Ra, a predetermined number of sheets from the back surface side to a back surface area Rb, and an area between them is referred to as a central area Rs. Then, even when the number of sheets m of the sheet bundle S is small, when the color sheet is inserted in the central region Rs, it is difficult to be affected by the back surface heaters 12a and 12b. Therefore, the color sheet is
Alternatively, the heating temperature is set low only when it is inserted into the back surface region Rb. The insertion position is the operation panel 53.
The CPU 52 calculates from the number of sheets m of the sheet bundle S and the insertion page input at, and notifies the microprocessor 21 of the result.

FIG. 11 shows a flowchart of the operation in this case. The number of sheets m is compared with the set value M (S1
0), if the number of sheets m is equal to or greater than the set value M, the default temperature control B (S11) is performed. On the other hand, if the number of sheets m is less than or equal to the set value M, it is checked whether or not a color sheet is inserted (S12). When the color sheet is not inserted, the default temperature control B (S11) is performed. When the color sheet is inserted, the insertion page (area) is checked (S
13). If the insertion area of the color sheet is the central area Rs according to the information from the CPU 52, the process proceeds to step 11. On the other hand, the insertion area is the front surface area Ra or the back surface area Rb.
If so, temperature control B in which the set temperature of the back heater 12s is low is performed (S14).

The first to third embodiments described above are
Although the color sheet output from the color copying machine has been described as the insert sheet that is easily offset, the present invention can be applied to the case where the insert sheet having a lower melting temperature of the image forming material than the black toner is inserted. You can

[0046]

As described above, according to the present invention,
In a bookbinding device that bundles a sheet bundle with an adhesive tape coated with a heat-melting adhesive, the heating set temperature of the heating means is determined according to the number of base sheets, the properties of the insertion sheet, the insertion position of the insertion sheet, etc. Accordingly, even if the insertion sheet material is formed of a color toner or the like having a low melting temperature, it is possible to prevent the color toner from being melted and offset to another sheet material.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which the bookbinding device of Example 1 is mounted as a post-processing device of a copying machine.

FIG. 2 is a diagram showing a state in which a sheet bundle is bound with an adhesive tape in Example 1.

FIG. 3 is an enlarged cross-sectional view of the adhesive tape of Example 1.

FIG. 4 is a block diagram of the bookbinding apparatus according to the first embodiment.

FIG. 5 is a flowchart showing the operation of the bookbinding device according to the first embodiment.

FIG. 6 shows the relationship between the number of sheets in a sheet bundle and the temperature of the adhesive surface B in Example 1.

FIG. 7 is a diagram showing a relationship between time and a temperature change of the adhesive surface A and the adhesive surface B in Example 1.

FIG. 8 is a diagram showing a temperature sensor and a humidity sensor according to the second embodiment.

FIG. 9 is a diagram showing an area in which color toner is likely to offset in the relationship between temperature and humidity in the second embodiment.

FIG. 10 is a diagram illustrating a front surface area, a back surface area, and a central area of a sheet bundle in the third embodiment.

FIG. 11 is a flowchart showing the operation of the bookbinding device according to the third embodiment.

FIG. 12 is a diagram showing a conventional relationship between time and changes in temperature of the adhesive surfaces A and B.

FIG. 13 is a view showing a conventional state in which the temperature of the adhesive surface B changes depending on the thickness of a sheet bundle.

[Explanation of symbols]

10 heating means 11a, 11b side heating member 11s back heating member 12a, 12b side heater 12s back heater 13a, 13b, 13s thermistor 14a, 14s drive mechanism 15 folding mechanism 16 glue tape supply mechanism 17 bundle generation unit 18 holding mechanism 21 micro Processor 22 Interface circuit 23 Regulator 24 Rear heater power control circuit 25 Side heater power control circuit 26a, 26b, 27 ROM 100 Bookbinding device 200 Inserter 300 Sorter 500 Copier body A Adhesive surface B Adhesive surface S Sheet bundle S _{1 to} S ₂₀ Base sheet (sheet material) Sa inserted sheet (front cover) Sb insert sheet (back cover) Sc insert sheet (color sheet) Ss back T adhesive tape (glue tape) T ₁ base layer T _2, T ₃ adhesive layer Ta, Tb end Ts center

Claims (6)

[Claims] 1. An adhesive tape in which a plurality of base sheets in a laminated state and an insertion sheet inserted into these base sheets constitute a sheet bundle, and a heat-melting adhesive is applied to the back of the sheet bundle. In a bookbinding device in which the sheet bundle is bundled by heating and pressure bonding, a heating unit that heats the adhesive tape, and a control unit that controls a heating set temperature of the heating unit are provided. The bookbinding apparatus, wherein the preset heating temperature of the heating means is determined according to the number of the base sheets forming the sheet bundle and the property of the insertion sheet. 2. The control means sets the heating set temperature low when the number of base sheets is less than a predetermined number and the insertion sheet is an insertion sheet image-formed with low melting toner. The bookbinding device according to claim 1, wherein: 3. The base sheet forming the sheet bundle includes a front surface area from a front surface side to a predetermined number, a back surface area from a back surface side to a predetermined number, and an area between the front surface area and the back surface area. In the case of an intermediate area, the control means includes at least one of the insertion sheets.
The heating set temperature is set low when a sheet belongs to at least one of the front surface area or the back surface area and the insertion sheet is an insertion sheet imaged with a low melting toner. The bookbinding device described in 1. 4. The heating means heats a back portion heating member that heats a central portion of the adhesive tape that is adhered to the back portion of the sheet bundle, and an end portion that is folded to the front surface side and the back surface side of the sheet bundle. 4. The side heating member for controlling the heating temperature of the back heating member and the heating temperature of the side heating member are controlled independently of each other. Or the binding device described. 5. The bookbinding apparatus according to claim 4, wherein the heating set temperature of at least one of the back heating member and the side heating member is set low. 6. The back heating member and the side heating member are low heat capacity heating elements provided with an insulating substrate and a thick film resistor formed by screen-printing a heating element on the insulating substrate. The bookbinding device according to claim 4 or 5, wherein: