JPH0976661A - Paste coating state monitoring apparatus for bookbinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for automatically detecting and monitoring the paste coating failure in a bookbinding machine. SOLUTION: The bookbinding machine coats the backbone of a folded book made of folded sheet pieces with paste, mounts a cover thereat to bookbind it, and comprises a paste coating state detecting means 23 for detecting the paste coating state at the backbone, a discriminating means 28 for discriminating the propriety of the coating state of the backbone with paste based on the detected result of the means 23, and processing means 31, 33, 46 for processing as prescribed based on the discriminated result. Thus, the accuracy of detecting the bookbinding failure is improved, and further the labor hour of selecting the defective product can be deleted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glue application state monitoring device for a bookbinding machine in which glue is applied to the spine of a collated book and a cover is attached.

[0002]

2. Description of the Related Art Conventionally, as a device for binding a collated book in which printed paper pieces are collated, as shown in FIG. 1, while cutting the spine, cutting the back, applying glue, adhering a cover sheet, etc. It is known to perform a series of steps sequentially and continuously. Figure 2 (a)
As shown in (d), the collated book 1 with the back cut is
After the glue 4 is applied to the spine 3 by the glue applicator 13 and the cover sheet 5 is further adhered, the three sides other than the spine 3 are further cut into the finished book 6. Here, in consideration of the fact that both side portions of the back portion 3 are cut off at the time of three-way cutting, the non-adhesive areas 3a may be formed.

[0003]

In the bookbinding machine as described above, as shown in FIG. 7 (a), the back portion 3 of the collating book 1 is used.
There is a deviation in the position where the glue layer 34 is formed with respect to the glue layer 34, the glue layer 34 is faint in the middle as shown in FIG. 4B, and further, as shown in FIG. In some cases, coating defects such as insufficient coating length may occur. If such a coating failure occurs, there is a problem that the cover sheet 5 is not sufficiently adhered, a page is dropped, etc., and a sound finished book 6 cannot be obtained. However, in the past, such inefficient method of checking and selecting such a defective application of glue has been adopted, such as manually performing at the stage of finished book.

An object of the present invention is to provide an apparatus for automatically detecting and monitoring a defective application of glue in a bookbinding machine, thereby improving the accuracy of bookbinding failure detection and reducing the trouble of selecting defective products. To aim.

[0005]

SUMMARY OF THE INVENTION The present invention is a bookbinding machine in which glue is applied to the spine of a collated book composed of collated paper pieces, and a cover is attached to the booklet to perform bookbinding. Related to the glue application state monitoring device, in order to solve the above problems, based on the glue application state detection means for detecting the glue application state of the back, and the detection result by the glue application state detection means, It is characterized by further comprising a determining means for determining whether or not the state of applying the glue to the back is good or bad.

According to the glue application state monitoring apparatus as described above, the glue application state detecting means detects the glue application state, and the determining means automatically determines the quality of the application state based on the detection result. The accuracy of detecting a bookbinding defect is improved.

The glue application state monitoring device may be provided with a processing means for performing a predetermined processing based on the judgment result of the judgment means. The processing means is, for example, when the application state is determined to be defective by the determination means, a defect notification means for notifying the occurrence of the failure by a screen display or an alarm sound, or a selection means for selecting a good book and a bad book. Can be configured. In this way, since the notification of defect occurrence or the selection of defective books is automatically performed, it is possible to reduce the trouble of selecting defective products.

Specifically, the glue application state detecting means may be provided with a light projecting section for projecting light to the back section and a light receiving section for receiving the reflected light reflected by the back section. In this case, the determining means can determine whether or not the back part is coated with the glue based on the reflected light received by the light receiving part. This makes it easy to determine the quality of the glue application state, and the detection unit can have a simple and inexpensive structure.

Further, the light projecting section is designed to project pulsed light at a predetermined pitch to the back section of the collated book conveyed at a predetermined speed, and the light receiving section is provided with the pulse from the back section. The reflected light may be received. Then, the determination means includes a counter that counts the pulses of the reflected light received by the light receiving unit, and based on the count result by the counter, determines whether or not the glue is continuously applied to the back portion. Can be configured. With this configuration, it is possible to reliably determine whether or not the glue is normally applied to the spine without interruption, and to efficiently perform the operation for conveying the collated book while the simple detection unit is configured.

In addition, a non-application area where no glue is applied is formed at the head of the collation book in the conveyance direction of the collation book, and a glue application area is formed following the non-application area. In such a case, it is possible to easily and efficiently determine whether or not the non-application area and the application area are normally formed by using the following apparatus configuration. That is, the printing machine side is provided with a pulse generation source that generates a pulse signal at a pitch synchronized with the conveyance speed of the collated book. Then, the determining means is configured to include the following requirements. Head detecting means: Detects the head of the back in the conveyance direction of the collated book. First counter: Counts the pulse signal from the pulse generation source until the light receiving section detects the reflected light from the coating area after the head detecting means detects the head of the back. Second counter: Counts the pulses of reflected light from the application area. Then, based on the counting result of the first counter, it is determined whether or not the glue is applied to the non-application area, and based on the counting result of the second counter, the glue is continuously applied to the application area. It is determined whether or not it has been done.

Next, the glue application state detecting means is provided with a light projecting portion for projecting light to the back portion and a light receiving portion for receiving the reflected light reflected by the back portion, and the determining means is the light receiving portion. Based on the amount of reflected light detected by the section, the presence or absence of glue in the longitudinal direction of the spine and the change in coating thickness are calculated, and if the coating thickness is within a predetermined range, it is judged as good Can be configured to. This makes it possible to detect not only the presence / absence of the application of the glue, but also a defect due to, for example, an excessive (or insufficient) application amount (thickness) of the glue.

On the other hand, for example, when heat-softening type glue is applied to the back at a temperature higher than that of the collating book,
The glue application state detecting means may be temperature detecting means for detecting the temperature of the back portion, and the determining means may be configured to determine the quality of the glue applying state based on the detection result of the temperature detecting means.

In this case, for example, it is possible to determine a region on the spine having a temperature equal to or higher than a predetermined temperature as a glue application region, and determine a region having a temperature equal to or lower than the temperature as a glue non-application region. By utilizing the fact that the thicker the part becomes, the higher the temperature becomes. It is also possible to know the distribution status of the paste application thickness from the temperature distribution of the back part. That is, the temperature detecting means detects the temperature distribution in the longitudinal direction of the back part, and the determining means calculates the presence or absence of glue and the change in the coating thickness in the longitudinal direction of the back part based on the detected temperature distribution. In addition, if the coating thickness is within a predetermined range, it can be determined as good.

Further, the glue application state detecting means can be configured to include an image detecting means for detecting an image of the glue applied to the back portion. In this case, the determining means determines whether or not the glue is applied in a predetermined state based on the image. Specifically, it is assumed that the image detecting means detects an image from the plane direction with respect to the back, and the determining means determines both of these based on the difference in the image between the glue-applied part and the non-applied part. By determining the area, it is possible to determine whether the application state of the glue is good or bad. On the other hand, if the image detecting means detects an image of the applied glue layer from the side direction in the longitudinal direction of the spine, the presence or absence of glue and the change in the applied thickness in the longitudinal direction can be determined from the image. Can be determined.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings based on some embodiments. FIG.
Shows the bookbinding machine 50 conceptually, and includes a collating book feeding device 11, a back cutting device 12, a glue applying device 13, a cover feeding device 14, a cover bonding device 15, a nipping device 16, and a collated book discharging device 17. 2, etc. are sequentially arranged along the circulation path, and as shown in FIG. 2, the collation book 1 held by the clamper 21 moves the back part 3 downwards by the transport mechanism 20 provided along the circulation path. The bookbinding process is sequentially performed by each of the above devices while being continuously conveyed in the longitudinal direction as the side. That is, the back portion 3 of the collation book 1 is cut by the back portion cutting device 12, and the glue 4 is applied to the back portion 3 by the glue applying device 13. Glue applicator 13
For example, as shown in FIG. 2 (a), the glue 4 in the glue tank 13a is attached to the coating roll 13b immersed in the glue 4 and the excess glue is scraped off by the scraping roll 13c, and then the paste is conveyed. It is adapted to be applied to the back 3 of the collating book 1 inside. As shown in (c), the cover sheet 5 is adhered to the collation book 1 to which the glue 4 is applied, and then the nipping device 16 nips the adhered portion,
It is discharged from the discharge device 17. Then, the discharged collated book is cut into three pieces other than the spine 3 to be a completed book 6 shown in (d). Here, as shown in FIG. 2B, non-adhesive application areas 3a are formed at both longitudinal ends of the spine 3 in consideration of being cut off during three-way cutting. Depending on the binding method, such as over-threading, the back may not be cut. In that case, the back cutting device 1
2 is omitted.

Next, as shown in FIG. 1, the transport mechanism 20.
Is provided with a conveyance drive unit 18 composed of a motor or the like, to which a pulse encoder 19 such as a rotary encoder is connected as a pulse generation source, and a pulse signal having a pitch synchronized with the conveyance speed of the collation book 1 is generated. It is adapted to be sent to the monitoring control unit 26 of the glue application state monitoring device of the present invention.

FIG. 4 is a block diagram showing an example of the structure of the glue application state monitoring device 10, which includes the I / O port 27 and the CPU 2.
8, control unit 26 including RAM 29, ROM 30, etc.
In addition, the ROM 30 stores various control programs 30a to 30f. On the other hand, RAM
The memory 29 is formed with memories 29a to 29g for storing various parameters required for the control. The above C
The PU 28 is the main body of the determination means.

As shown in FIG. 3A, the glue applying device 13
A collated book detection sensor 22 as a leading end detection means is arranged on the downstream side of, in close proximity thereto. The collation book detection sensor 22 is configured as a transmissive optical sensor including a pair of a light projecting portion 22a and a light receiving portion 22b that are provided to face each other at positions sandwiching the collation book 1 in the thickness direction. While detecting the leading portion of the collated book 1 being conveyed, as shown in FIG. 4, the light receiving portion 22b side thereof is connected to the I / O port 27 of the monitoring control portion 26 via the A / D converter 22c. It is connected.

On the other hand, as shown in FIG. 3, a glue detecting sensor 23, which is an essential part of the glue application state detecting means, is provided at a position facing the back portion 3. This glue detection sensor 23 is
As shown in FIG. 4B, for example, a laser projecting portion and a sensor unit 23a integrally provided with a light receiving portion for receiving the reflected light from the back portion 3 are provided, and are shown in FIG. As described above, the light projecting unit 23 b is connected to the I / O port 27 via the pulsed light generation control unit 24, and the light receiving unit 23 c is connected to the I / O port 27 via the A / D converter 25. The light projecting unit 23b is based on the pulse light generation control program 30f stored in the ROM 30 and is based on the pulse light generation control unit 2
4 controls to emit pulsed light synchronized with the pulse signal from the pulse encoder 19 to the back 3 of the collation book 1.

Next, as shown in FIG.
A warning sound generator 31 and a display control unit 32 are connected to the I / O port 27 of the CRT, and the display control unit 32 has a CRT.
A display unit 33 including a monitor and a liquid crystal panel is connected. The alarm sound generating device 31 and the display unit 33 constitute a processing means.

The operation of the glue application state monitoring device 10 will be described below.
This will be described with reference to the time chart of FIG. 5 and the flowchart of FIG. That is, after the glue 4 is applied to the spine 3 of the collated book 1 being conveyed (FIG. 2), when the collation book sensor 22 detects the leading portion of the collation book 1 in S1 of FIG.
The first counter program 30c of 0 starts and starts counting pulse signals (hereinafter referred to as encoder pulses) from the pulse encoder 19 in S2.

Here, the light projecting portion 23b of the glue detecting sensor 23
Emits pulsed light in synchronization with the encoder pulse toward the spine 3 of the collation book 1, but when glue 4 is applied to the spine 3 as shown in FIG. The light is reflected by the glue layer 34, and the pulsed reflected light L is received by the light receiving section 23c. The light-receiving unit 23c receives this signal and outputs a pulse signal, and is digitized by the A / D converter 25 shown in FIG. ", And those less than" are binarized. On the other hand, as shown in FIG. 3D, when the glue 4 is not applied to the back portion 3, the light amount of the reflected light L becomes small, and it is recognized that there is no signal by the binarization process. That is, the signal from the light receiving unit 23c becomes a pulse signal (hereinafter, referred to as glue detection pulse) synchronized with the encoder pulse when the glue layer 34 is detected, and becomes a no-signal state when it is not detected. The light projecting unit 2
3b is continuously projected onto the back 3, and the light receiving signal is intermittently sampled at the light receiving unit 23c or the monitor control unit 26 side at intervals synchronized with the encoder pulse, so that the glue detection pulse is generated. It may be configured to detect. In addition, some reflected light may be generated from the area of the spine 3 where the glue is not applied, and the head of the collation book 1 can be detected by detecting this by the light receiving portion 23c. In this case, the collation sensor 2
2 can be omitted.

Now, when the state of applying the glue is normal, as shown in FIG.
As shown in FIG. 3, since the non-application area 3a having a predetermined length is formed at the head portion of the back portion 3, the glue detection pulse is not detected for a certain period after the collation book 1 is detected. During that time, the above-mentioned first counter continues counting the encoder pulses, and the count value is the RAM 29 (FIG. 4).
Is added to the first counter memory 29f. Next, FIG.
In, when the collation book 1 is conveyed and the light receiving section 23c starts to detect the glue layer 34, the first counter stops counting,
Based on the count value at that time, the length L of the non-application area 3a
1 is calculated (S3, S4). Then, in S5, the calculated value L1 is around the reference data LS1 and the allowable error (± Δ
If it is within the LS1) range, it is determined to be normal and the process proceeds to S6. Here, the reference data LS1 and the allowable error ΔLS1
The value of is stored in each of the memories 29a to 29d (FIG. 4) of the RAM 29 together with the reference data LS2 and the allowable error ΔLS2 for the glue application area 3b (FIG. 2). Also,
Whether or not the calculated value L1 is within the allowable error range is determined based on the determination program 30a of the ROM 30.

Returning to FIG. 6, when the first counter stops counting, the second counter program 30d is activated to start counting glue detection pulses (S6). This count value is added to the second counter memory 29g, counting is stopped when the glue detection pulse is no longer detected, and the length L2 of the coating area 3b is calculated based on the count value at that time ( S7, S8). Then, in S9, if the calculated value L2 is within the allowable error (± ΔLS2) range with the reference data LS2 as the center, it is determined to be normal. The length of the non-application area 3a formed at the end of the back part 3 is automatically determined to be within the allowable range if L1 and L2 are within the allowable range. There is a book 1
The same determination may be performed by calculating from the total length L3 (see FIG. 5) and the calculated values L1 and L2. When performing the same processing for the next collated book 1, the counter memories 29f and 29g are cleared in S11, and the processing returns to S1 to repeat the following processing.

Next, in S5 of FIG. 6, the non-application area 3a
If the calculated value L1 of is out of the allowable error range, the process proceeds to S12 and the alarm process is performed. Specifically, as shown in FIG. 7A, it is possible to exemplify a case in which the glue layer 34 is formed on one side of the back portion 3 in a displaced manner. In this case, the glue layer 34 is at the top. When it is shifted to the side, the length L1 of the non-coating layer 3a is below the allowable error range, and when it is shifted to the rear side, it exceeds the allowable error range and becomes large (the latter half of the timing chart of FIG. 5). Shows an example of the detection state of each sensor at that time). Further, in S9 of FIG. 6, when the calculated value L2 of the coating region 3b is out of the allowable error range, the process similarly proceeds to S12. As a specific example in this case, as shown in FIG. 7B, the application region 3b (the glue layer 3
4) is formed in the middle and is interrupted, or as shown in FIG. 4C, the coating region 3b is short (or long rearward). In the latter case, if the length L1 of the non-application area 3a exceeds the allowable error range, the process proceeds from S5 to S12 in FIG.

Here, as the value of each of the reference data LS1 and LS2, a value sampled from a good book prepared in advance can be adopted. Further, an average value of values sampled from a plurality of good books may be adopted. Furthermore, as a simple method, the data of a good book processed immediately before may be used. In this case, the values of the reference data LS1 and LS2 are updated each time a new good book is generated.

FIG. 11 shows a specific example of the display on the display unit 33. The image 1f of the collated book 1 is displayed on the screen 33a of the display unit 33, and below the portion corresponding to the back portion 3 thereof. A coating state display area 33b is formed.
The coating state display area 33b is obtained by dividing the spine 3 of the collating book 1 being processed at predetermined intervals along the longitudinal direction.
The application state is divided into sub-regions 33c corresponding to the respective divided regions, and the processed state is displayed in order from the color or lightness (hereinafter collectively referred to simply as "color"). It is like this. For example,
The unprocessed part is uniformly displayed in the first color (for example, blue), and the region where the glue is applied in the processed part is the second color (for example, white),
The uncoated areas can be displayed in a third color (eg black). In addition, if the adhesive is not applied to the area where the adhesive should originally be applied, or if the adhesive is applied to an area that should not be applied, a defect is applied to the area where the application failure occurs. An alarm can be displayed in the color shown (for example, red). In this case, "Defective occurrence!
! A warning message such as "" may be displayed together.

Next, if the light amount of the reflected light is also detected by the light receiving portion 23c, not only the presence or absence of the glue layer 34, but
As shown in FIG. 8, it is also possible to measure the change (distribution) of the thickness t of the spine 3 in the longitudinal direction. That is,
As shown in FIG. 3A, the collation book 1 is so arranged that the distance between the sensor unit 23a and the back portion 3 is maintained at a predetermined value d0.
If the sensor unit 23 is conveyed from the surface of the glue layer 34,
The distance d to a becomes smaller as the thickness t of the glue layer 34 is larger. At this time, the light amount of the reflected light detected by the light receiving unit 23c decreases in inverse proportion to the square of the distance d. Therefore, based on the detected light amount, as shown in FIG. The change can be calculated. Then, in the coating area 3b, the thickness t has a maximum value tmax and a minimum value tm.
It can be configured to judge a defect if it is out of the allowable range defined by in and. The calculation of the thickness t from the amount of reflected light is performed based on the coating thickness calculation program 30e of the ROM 30 (FIG. 4).

In this case, as a specific example of the display on the display unit 33, a display similar to that shown in FIG. 11 can be adopted. That is, as shown in FIG. 12, in the coating state display area 33b, the cross-sectional shape of the glue layer 34 is displayed in order from the area where the treatment is finished, and the portion 33d whose thickness t deviates from the above-mentioned allowable range is displayed. By displaying in a different color from other parts, the defective part can be notified.

Next, as the glue application state detecting means, other than the above-mentioned reflection type optical sensor can be used. For example, as shown in FIG. 4, a capacitance type sensor 40 can be used. Specifically, the capacitance between the detection body and the detection body (that is, the glue layer 34) is measured by a bridge circuit or the like, and this capacitance is set to the distance between the detection body and the glue layer surface. The presence or absence or the thickness distribution of the glue layer 34 can be detected based on the fact that it changes in inverse proportion.

On the other hand, when the heat softening type glue 4 is applied to the spine 3 at a temperature higher than that of the collating book 1,
The temperature or temperature distribution of the back 3 may be detected by a temperature sensor (temperature detecting means) 44. in this case,
For example, it is possible to determine a region of the spine 3 having a temperature equal to or higher than a predetermined temperature as a glue application region 3b, and a region having a temperature equal to or lower than the temperature as a non-application region 3a. Further, by utilizing the fact that the thicker the portion coated with the glue 4 is, the higher the temperature can be, so that the distribution state of the thickness t of the glue layer 34 can be measured from the temperature distribution in the back portion 3.

The image of the glue layer 34 applied to the back portion 3 may be detected by an image detecting means such as the CCD sensor 42. For example, as shown in FIG.
A CCD camera 48 configured to include the CD sensor 42 and for taking an image of the back portion 3 from a plane direction is arranged.
As shown in FIGS. 10A to 10C, the glue application area 3b
And non-application area 3a (or defective portion 3 due to insufficient application)
Each of these areas can be discriminated based on the difference between the images of FIG. On the other hand, if the CCD camera 48 is arranged so as to photograph the glue layer 34 from the side direction in the longitudinal direction of the back portion 3, as shown in FIG. 10D, the presence or absence of the glue layer 34 and the coating thickness are shown in the image. The change in t can be determined.

In the above-mentioned embodiment, the processing means has a constitution of notifying it by displaying a screen or generating an alarm sound. For example, as shown in FIG. It is also possible to use the sorting operation unit 46 that releases the holding state by the clamper 21 (FIG. 2) and separates the collated book 1 from the transport path in the case of occurrence of.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the configuration of a bookbinding machine.

FIG. 2 is a conceptual diagram of a glue applying device, and a perspective view showing how glue is applied to the spine of a collated book and a method of attaching a cover.

FIG. 3 is an explanatory view showing a positional relationship between a collated book sensor and a glue detection sensor with respect to a collated book.

FIG. 4 is a block diagram showing a configuration of a glue application state monitoring device as an example of the present invention.

FIG. 5 is a timing chart showing an operation time series of each part of the adhesive application state monitoring device.

FIG. 6 is a flowchart showing a processing flow of the glue application state monitoring device.

FIG. 7 is an explanatory diagram showing an example of defective application of glue.

FIG. 8 is an explanatory diagram showing an example of measuring a thickness distribution of a glue layer with a reflective optical sensor.

FIG. 9 is a schematic diagram showing a state in which a CCD camera for taking an image of a back portion or a glue layer is arranged.

FIG. 10 is a schematic view showing an example of images of a back portion and a glue layer detected by a CCD camera.

FIG. 11 is a schematic diagram showing an example of an alarm display on the display unit.

FIG. 12 is a schematic diagram showing another example thereof.

[Explanation of symbols]

1 collation book 3 back 4 glue 5 cover sheet 13 glue application device 19 pulse encoder (pulse generation source) 20 transport mechanism 22 collation book detection sensor (head detection means) 23 glue detection sensor (glue application state detection means) 23b light emission Part 23c Light receiving part 28 CPU (determining means) 29 RAM 29f First counter memory (first counter) 29g Second counter memory (second counter) 31 Alarm sound generating device (processing means) 33 Display part (processing means) 40 Capacitance sensor (glue application state detection means) 42 CCD sensor (glue application state detection means, image detection means) 44 Temperature sensor (glue application state detection means, temperature detection means) 46 Sorting operation section (processing means) 50 Binding Machine

Claims (8)

[Claims] 1. A bookbinding machine configured to apply glue to the spine of a collated book composed of collated paper pieces, attach a cover to the spine, and bind the book, to detect the application state of the glue on the spine. Glue applying state detecting means, and a judging means for determining whether or not the glue applying state to the spine is good or bad based on the detection result by the glue applying state detecting means. Cloth condition monitoring device. 2. The glue application state detecting means includes a light projecting portion that projects light to the back portion, and a light receiving portion that receives reflected light reflected by the back portion, and the determining means is The glue application state monitoring device according to claim 1, wherein it is determined whether or not the glue is applied to the spine based on the reflected light received by the light receiving unit. 3. The light projecting section is adapted to project pulsed light at a predetermined pitch to the back section of the collated book conveyed at a predetermined speed, and the light receiving section is , The pulsed reflected light from the back portion is received, and further, the determination means includes a counter for counting the pulse of the reflected light received by the light receiving portion, based on the counting result by the counter. 3. The adhesive application state monitoring device according to claim 2, wherein it is determined whether or not the adhesive is continuously applied to the spine. 4. A non-application area in which the glue is not applied is formed at a head portion of the spine in a conveyance direction of the collated book, and a glue application area is formed following the non-application area. It is configured such that the bookbinding machine includes a pulse generation source that generates a pulse signal at a pitch that is synchronized with the transport speed of the collated book, and the determination unit is the collated book. Head detecting means for detecting the head of the back portion in the transport direction of, and the pulse until the light receiving portion detects the reflected light from the coating area after the head detecting means detects the head of the back portion. A first counter that counts a pulse signal from a generation source, and a second counter that counts a pulse of reflected light from the coating area, based on the counting result by the first counter, the non-coating region It is possible to determine whether or not the glue has been applied, and to determine whether or not the glue is continuously applied to the application area based on the counting result by the second counter. The glue application state monitoring device according to claim 3. 5. The glue application state detecting means includes a light projecting portion that projects light onto the back portion, and a light receiving portion that receives reflected light reflected by the back portion, and the determining means includes the light emitting portion. Based on the amount of the reflected light detected by the light receiving unit, the presence or absence of the glue in the longitudinal direction of the spine and the change in coating thickness are calculated, and when the coating thickness is within a predetermined range. The adhesive application state monitoring device according to claim 1, wherein is determined to be good. 6. The glue is applied to the spine at a temperature higher than that of the collated book, and the glue application state detecting means includes a temperature detecting means for detecting a temperature of the spine, and the determining means. The adhesive application state monitoring device according to claim 1, wherein the adhesive application state monitoring device is configured to determine the quality of the adhesive application state based on the detection result of the temperature detecting means. 7. The temperature detecting means is for detecting a temperature distribution in the longitudinal direction of the back portion, and the judging means is based on the detected temperature distribution,
The adhesive coating according to claim 6, wherein the presence or absence of the adhesive and the change in the coating thickness in the longitudinal direction of the spine are calculated, and when the coating thickness is within a predetermined range, it is determined as good. Cloth condition monitoring device. 8. The adhesive application state detecting means includes image detecting means for detecting an image of the adhesive applied to the spine, and the determining means applies the adhesive in the predetermined state based on the image. The glue application state monitoring device according to claim 1, which is configured to determine whether or not it has been applied.