JP2005062127A - Poor cutting in pull-out binding sensitive device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method, capable of detecting poor cutting in pullout binding high in reliability with a small space for installation. <P>SOLUTION: The cut pull-out binding inspection device 1 comprises a feed means 10 for feeding the pullout binding B heading the back part of the same, the square 30 being in contact with the back E1 of the pull-out binding B and the sides E2, and the sensor 40 for detecting clearances between the square 30 and each side of the pull-out binding B. The pull-out binding B is conveyed by the feed means 10 aslant with respect to the square 30, and when the back E1 of the pull-out binding B abuts the stop side 33 of the square 30, and the head or tail side E2 abuts the guide side 35, the pull-out binding B is stopped. Pull-out bindings B with proper perpendicularity precisely abuts the square 30, but ones with poor perpendicularity generates clearance gaps between the sides of the pull-out binding B and the square 30. The sensor 40 detects the clearance gaps and determines the angularity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus and method for inspecting the squareness of a crease that has been cut in three directions and detecting a cutting failure. In particular, the present invention relates to an apparatus and method that can easily and accurately inspect the perpendicularity of the back and top of the cut signature and the top and bottom width and the top and bottom width. Note that the back of the fold is the portion outside the crease.

  A signature (saddle stitch book) is created through a printing process on roll paper, a cutting process, a saddle stitching process, a folding process, a decorative cutting (three-way cutting) process, and the like. In recent years, in direct mail, a machine that connects a computer to a printing system such as an ink jet and prints and packs an address and a name for each book has been put into practical use.

  In such a compromise creation process, not only productivity but also product quality is naturally emphasized. In particular, it is important whether or not each corner of the signature is cut at right angles after the cosmetic cutting process, which is the final process.

An example of the eclectic three-way cutting method will be described. In three-way cutting, cutting is done so that the back and the other three sides are at right angles to each other on the basis of the back of the signature.
FIG. 5 is a diagram illustrating an example of a three-way cutting method.
First, as shown in FIG. 5 (A), the back E1 (which is often bound by a stitcher or the like) E1 before the three-way cutting is applied to the stopper 70. Then, the side E4 parallel to the spine E1 of the signature B is cut with a cutting knife 71 installed in parallel to the stopper 70. The side E4 parallel to the spine E1 is referred to as a small edge.

Next, as shown in FIG. 5B, the back E1 of the signature B from which the fore edge E4 has been cut is applied to another stopper 80. Then, the two sides E2 and E3 perpendicular to the spine E1 of the signature B are cut with the two cutting knives 81 installed at right angles to the stopper 80. The two sides E2 and E3 perpendicular to the spine E1 are called top and bottom sides.
Note that the order of FIGS. 5A and 5B may be reversed.

As a result, as shown in FIG. 5 (C), each erect edge E2, E3 is perpendicular to the spine E1, the small edge E4 is parallel to the spine E1, and a compromise B perpendicular to the upper and lower edges E2, E3 is formed. .
Thus, the signature B should be cut so that each corner becomes a right angle. However, when the back E1 is not completely in contact with each of the stoppers 70 and 80, or when the paper is lifted up, the perpendicularity is distorted, resulting in a compromise of cutting failure.

  As an apparatus for inspecting such a defective fold, for example, an apparatus applied to a fold obtained by folding a plurality of papers so as to have a predetermined size is disclosed (for example, Patent Documents 1 and 3). (See figure). In this device, two line sensors are arranged in the direction in which the signature is conveyed, and two line sensors are arranged in a direction perpendicular to the same direction, and whether or not the front edge of the signature in the conveyance direction is perpendicular to the crease line. And the width of the signature.

JP-A-60-137770

  In this inspection apparatus, since the direction of each line sensor is one direction (conveyance direction), it seems that high-precision measurement cannot be performed in a direction orthogonal to this direction.

  On the other hand, as a method of detecting a defect in the saddle stitch format, there is a method in which the entire contour is photographed with a CCD camera and the defect is judged by comparing the image with a reference image. However, in this method, there are many unstable elements such as an object other than the object such as a conveyor belt being photographed.

  In the bookbinding line as described above, since printing, cutting, folding, saddle stitching, and three-way cutting are performed in a series of steps, many apparatuses are arranged in a complicated manner. Even if it is going to install an inspection apparatus in such a place, since the above-mentioned conventional inspection apparatus requires many installation space, introduction to an existing line is difficult in terms of space.

  In view of the above-described points, an object of the present invention is to provide a highly reliable apparatus and method that can detect a failure of a trimmed fold because the installation space is small.

  The trimmed signature detection device of the present invention is a device for detecting a trimming failure of a material obtained by trimming the other three sides (the trimmed signature) on the basis of the signature of the signature. A feeding means to be fed first; a right angle ruler which contacts the back of the signature and one side which should be perpendicular to the signature; and the right angle ruler and each side of the signature applied to the right angle ruler. Means for detecting a gap between them, and in the feeding means, the signature is sent obliquely, the signature is applied to the right-angle ruler and stopped, and each contact edge of the ruler and the spine and The perpendicularity of the signature is inspected from a gap between the side edges.

  A signature with a good perpendicularity hits the right angle ruler exactly, but if the squareness is bad due to a cutting failure or the like, a gap is formed between the signature and the right angle ruler. By detecting this gap, the perpendicularity can be determined.

  By conveying the signatures at an angle, the back and top of the signature are easy to hit each side of the right angle ruler, and the signature is easily positioned on the right angle ruler. In addition, the mechanism can be simplified and the work efficiency is high as compared with the case where another mechanism for moving the signature in the direction perpendicular to the conveying direction of the signature is provided. Further, since the perpendicularity is determined in a state in which the signature is stopped by hitting the right angle ruler, the inspection can be accurately performed in a stable state.

  In the present invention, the means for detecting the gap is a sensor A disposed at a corner of the right-angle ruler, on a contact edge of the right-angle ruler on which a side of the signature is applied, and the corner From the sensor B arranged at a position separated by the width of the signature to be inspected, passing through the position at which the sensor B is arranged, and on a line extending in parallel with the side of the right ruler to which the signature signature is applied The sensors C and D arranged at a predetermined interval are separated from the sensor B by a predetermined interval (about a dimensional tolerance) in a direction away from a side to which the spine of the right angle ruler is applied. When the sensor A, B senses a signature, it has sensors E, F arranged at a predetermined interval on a line extending in parallel with the side to which the spine of the right ruler is applied. , Determined that the back and sides of the eclectic are orthogonal When either of the sensors A and B does not detect a fold, it is determined that the back and sides of the fold are not orthogonal, and the sensors B, C, and D detect a fold, When the sensors E and F do not detect a signature, it can be determined that the width dimension of the signature is within a tolerance range.

  Each sensor can detect the perpendicularity between the back and top of the eclectic, the perpendicularity between the small edge and the top, and the parallel between the small edge and the back. Also, the dimension between the back and the small edge can be detected.

  In the present invention, a predetermined interval is further provided on a line separated from the side of the right-angle ruler on which the side of the signature is applied by the height of the signature to be inspected (the width of the back and the side of the small edge). The sensors G and H arranged at a distance from the position where the sensors G and H are arranged are separated by a predetermined distance (about dimensional tolerance) in a direction away from the side where the side of the signature of the right angle ruler is applied. And sensors I and J arranged at a predetermined interval on a line extending in parallel with the side to which the side of the signature of the right-angle ruler is applied, and the sensors G and H detect the signature In addition, when the sensors I and J do not detect a compromise, it can be determined that the height dimension of the signature is within a tolerance range.

In the present invention, when a failure of the cut signature is detected, the whole or a part of the right angle ruler is raised and the signature is advanced by the feeding means before the right angle ruler, and then the right angle ruler. It is preferable that the whole or a part of the fold is lowered and the front end in the traveling direction of the fold is guided downward to discharge the fold.
Since the right angle ruler is used not only for measuring the perpendicularity of the signature but also for eliminating the defective signature, it is not necessary to provide a separate discharge mechanism. Moreover, since the discharge part can be located in the lower part between the inspection process and the next process, no special space is taken.

  The trimmed signature detection method of the present invention is a method for detecting a trimming failure in the other three sides (the trimmed signature) on the basis of the signature of the signature. First, put the back of the signature and one side that should be perpendicular to it to the two sides of the right angle ruler, and the right angle ruler and each side of the signature applied to it The perpendicularity of the signature is detected by detecting a gap between the two.

  In the present specification, “folding” refers to folding a sheet-like member such as paper or a plastic sheet and overlapping the folds. “Back” refers to the outside of the fold of the fold.

  ADVANTAGE OF THE INVENTION According to this invention, the detection apparatus and method which can detect the squareness of the cut signature with high precision can be provided. In addition, the perpendicularity can be detected efficiently with a simple mechanism, and an apparatus including a defective main discharge mechanism that does not take up space can be provided.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1A and 1B are diagrams showing a schematic configuration of a folding / cutting defect detection device according to an embodiment of the present invention. FIG. 1A is a plan view and FIG. 1B is a side view.
FIG. 2 is a plan view showing the arrangement of the sensors of the eclectic cutting defect detection device of FIG.
The fold cut cutting defect detection device 1 in this figure is arranged in a forward direction of the feed means 10 with a feed means 10 that sends the fold B in an oblique direction with the back (the outer portion of the fold) E1 first, A right-angle ruler 30 that inspects the squareness by hitting the side of the signature B and a plurality of sensors 40 are provided.

  As shown in FIG. 1B, the feeding means 10 is composed of upper and lower belt conveyors 11 and 17. The upper belt conveyor 11 is composed of two parallel belts 15 wound between a pair of rollers 13. The lower belt conveyor 17 is composed of two parallel belts 21 wound around a pair of rollers 19. A clearance is formed between the upper and lower belts 15 and 21 by a width substantially equal to the thickness of the signature B to be inspected, and a space between the upper and lower belts is a conveyance path 25 for conveying signatures. Each roller of each roller pair 13 and 19 is arranged in parallel. In this example, the upper roller pair 13 rotates clockwise and the lower roller pair 19 rotates counterclockwise. Further, the distance between the lower roller pair 19 is longer than the distance between the upper roller pair 13.

  As clearly shown in FIG. 1A, the belts 15 and 21 of the upper and lower belt conveyors are positioned at substantially the same plane position and are wound obliquely around the roller pairs 13 and 19. Actually, each belt has a rope shape with a circular cross section (for example, a diameter of 6 mm), and the belt is wound around each roller pair. Grooves are formed. With such an arrangement, the belts 15 and 21 rotate endlessly on an oblique track (arrow A1 in the figure). The angle between each belt 15, 21 and each roller pair 13, 19 is preferably 5 ° to 10 °.

  When each of the roller pairs 13 and 19 is rotated, the signature B is transported through the transport path 25 from the entrance (right side in the figure) to the exit (left side in the figure). The signature B is entered from the entrance into the transport path 25 with the back E1 first. At this time, as shown in FIG. 1A, the spine E1 of the signature B is inclined with respect to the track A1. The signature B is transported in the lower left direction in FIG. 1A along the transport path 25 along the oblique track A1.

The right angle ruler 30 is arranged on the outlet side of the feeding means 10 so that the corner portion 31 is positioned in the oblique conveyance direction A1 of the feeding means 10. The right-angle ruler 30 has a contact side (stopper side) 33 that is a reference side and a contact side (guide side) 35 that is perpendicular to the stopper side 33. The stopper side 33 and the guide 35 side are located on the same plane as the transport path 25. The stopper side 33 is disposed on the downstream side of the lower roller pair 19 of the feeding unit 10, and the guide side 35 extends from the stopper side 33 in the direction of the feeding unit 10.
The right angle ruler 30 is movable in the vertical direction. This is for discharging defective products as will be described later.

  A plurality (six) of sensors 40 are arranged on the inner surface of the right-angle ruler 30. These sensors 40 are for detecting the perpendicularity between the back E1 and the top and bottom sides E2 and the parallelism between the back E1 and the small edge E4 with reference to the back E1 of the signature B.

The arrangement of the sensor 40 will be described with reference to FIG.
The sensor 40 </ b> A is disposed at the corner 31 (intersection of the stopper side 33 and the guide side 35) 31 of the right-angle ruler 30. The sensor B is disposed near the end of the guide side 35. The distance L1 between the sensor 40A and the sensor 40B is a distance equal to the vertical width (the width of the vertical edge E2) of the cut signature B to be inspected.

  The other sensors 40C, 40D, 40E, and 40F are attached to the sensor attachment member 39 as shown in FIG. In this example, the sensor attachment member 39 is disposed between the upper and lower tracks of the upper belt conveyor 11. The sensor mounting member 39 has two sides 39a and 39b parallel to the stopper side 33 of the right-angle ruler 30 (perpendicular to the guide side 35). One side 39a is a side (inner side) passing through the sensor 40B, and the other side 39b is outside the inner side 39a by a distance of a dimensional tolerance range T (1 mm, for example) of the cut signature. It is a side (outside side) separated in a direction (a direction away from the stopper side).

The arrangement of the sensors 40C, 40D, 40E, and 40F will be described with reference to FIG.
The sensors 40C and 40D are disposed on the inner side 39a. The sensor 40C is arranged in a direction away from the guide side 35 by a predetermined distance L2 (10 mm as an example) from the sensor 40B. The sensor 40D is movable on the side 39a, and is arranged in a direction approaching the guide side 35 by a predetermined distance L4 (10 mm in one example) from the length (L0) of the back and side of the signature B.
Thus, the sensors 40B, 40C, 40D are arranged on a line (39a) parallel to the stopper side 33 and perpendicular to the guide side 35.

The sensors 40E and 40F are arranged on the outer side 39b. The sensor 40E is arranged in a direction away from the side 35 by a predetermined distance L2 (10 mm as an example) from the guide side 35. The sensor 40F is movable on the side 39b, and is arranged in a direction approaching the guide side 35 by a predetermined distance L4 (10 mm in one example) from the length (L0) of the back and the small edge of the signature B.
Thus, the sensors 40E and 40F are parallel to the stopper side 33 and only a predetermined distance T from the line (39a) passing through the sensors 40B, 40C, and 40D (within a dimensional tolerance range of the cut signature, for example, 1 mm). In this case, it is arranged on a line (39b) away from the stopper side 33. The sensors 40D and 40F are moved according to the height of the signature B.
Further, a sensor 40Z is disposed on the inner side from the corner 31 of the right-angle ruler 30.

  These sensors 40 have a function of detecting a gap between each side of the right-angle ruler 30 and the sensor mounting member 39 and the signature B. For example, a sensor using a laser light emitting element or an optical fiber can be used. When a sensor using a laser is used, the laser spot is preferably 0.5 mm or less.

Next, with reference to FIG. 1, a method for detecting a failure of the signature cutting will be described.
First, the cut signature B is inserted from the entrance of the feeding means 10 into the conveyance path 25 between the upper and lower belts with the spine E1 first. The signature B is transported on an oblique track A1 between the upper and lower belts 15 and 21 through the transport path 25. At this time, as described above, the signature B is located obliquely with respect to the track A1. When the signature B reaches the exit of the feeding means 10, the signature B hits the right-angle ruler 30, and the progression of the signature B stops.

  The reason why the signature B is conveyed obliquely toward the right-angle ruler 30 is to advance the signature B in both directions of the stopper side 33 and the guide side 35 of the right-angle ruler 30 simultaneously. In this way, the spine E1 of the signature B and one top and bottom side E2 can easily hit the stopper side 33 and the guide side 35 of the right-angle ruler 30.

  Actually, the eclectic B is transported so that the top and bottom sides E2 hit the guide side 35 first. When the top edge E2 of the signature B first hits the guide edge 35, the top edge E2 is guided by the guide edge 35, and the conveying direction of the signature B is from the oblique direction A1 toward the stopper edge 33 (to the stopper edge 33). (Vertical direction). As a result, the spine E1 of the signature B can be reliably brought into contact with the stopper side 33.

Thus, by conveying the signature B obliquely, the spine E1 can be reliably applied to the stopper side 33 of the right-angle ruler 30, and the signature B can be positioned on the right-angle ruler 30.
In addition, as a method of placing the corner of the eclectic on the corner of the right angle ruler, after conveying straightly and determining the back, there is also a method of applying the corner to the corner by sending it left or right, but this method is It is more efficient than this method and the mechanical structure is simple.

  Thus, the signature B basically stops temporarily with the spine E1 applied to the stopper side 33 of the right angle ruler 30 and the top and side E2 applied to the guide side 35. In this state, the detection status of each sensor 40 is determined. The rotation of each roller pair of the feeding means 10 is stopped at the moment when the signature B hits the right-angle ruler 30 (the moment when the sensor 40Z senses it).

FIG. 3 is a diagram illustrating a detection example of the eclectic cutting failure detection apparatus of FIG. In FIG. 3, a sensor in which the diagram showing the sensor 40 is blacked out indicates that the sensor 40 is sensing.
First, a normal case will be described with reference to FIG.
When the cut signature B is normal, the sensors 40A, 40B, 40C, and 40D sense, and the other sensors 40E and 40F do not sense.
The sensor 40A is arranged at the corner 31 of the right angle ruler 30 where the corner of the spine E1 of the signature B and the one of the top and bottom edges E2 hits, so that when the sensor senses, the corner C1 of the signature B is a right angle. It shows that it is located in the corner 31 of the ruler 30. Then, when the sensor 40B senses, it indicates that the edge on the small edge side of the top and bottom sides E2 of the signature B is in contact with the guide side 35. Accordingly, the top and bottom sides E2 are in contact with the guide side 35 over the entire length, and it is understood that the spine E1 and the top and bottom sides E2 that are in contact with the stopper side 33 are at right angles.

  The detection by the sensors 40C and 40D indicates that the small edge E4 of the signature B is parallel to the stopper side 33, in other words, is perpendicular to the guide side 35. Accordingly, it can be seen that the small edge E4 is parallel to the spine E1 and is perpendicular to the top and bottom edges E2.

  Furthermore, when the sensors 40C and 40D sense and the sensors 40E and 40F do not sense, it can be seen that the width of the top and bottom sides E2 is within the dimensional tolerance.

  As described above, when the sensors 40A, 40B, 40C, and 40D sense and the other sensors 40E and 40F do not sense, the top and bottom sides E2 are perpendicular to the spine E1, and the small edge 4 Is parallel to the spine E1 and perpendicular to the top and bottom side E2, and the width of the top and bottom side E2 is within the dimensional tolerance (normal book).

In this inspection apparatus, a sensor 40 can be added.
In this case, the sensors 40G and 40H are arranged at a predetermined interval on a line separated from the guide side 35 of the right-angle ruler 30 by the height L0 of the signature B. Further, the sensors 40I and 40J are separated from the positions where the sensors 40G and 40H are arranged by a predetermined distance (about a dimensional tolerance) in a direction away from the guide side 35, and on the line extending in parallel with the guide side 35. Open and place.

  If the sensors 40G and 40H detect it and the sensors 40I and 40J do not detect it, it is determined that the height of the signature B (the length of the back and fore edge, L0) is within the tolerance range.

Next, an example in the case of a defect will be described with reference to FIGS. In each figure, the degree of failure of signature B is exaggerated.
The example shown in FIG. 3B is a case where the sensor 40A does not sense and the sensor 40B senses it. The fact that the sensor 40A does not sense indicates that the corner C1 of the signature B is not located at the corner 31 of the right-angle ruler 30, that is, the top and bottom sides E2 do not hit the guide side 35. Nevertheless, the sensor 40B senses that the edge on the small edge side of the top edge E2 hits the guide edge 35, and it can be determined that the top edge E2 is inclined with respect to the spine E1. .
In this case, a defect can be detected only by the sensors 40A and 40B.

  The example shown in FIG. 3C is a case where the sensors 40A and 40D sense and the other sensors do not sense. One end of the top and bottom side E1 hits the guide side 35 by the detection of the sensor 40A, but the other end of the top and bottom side E2 does not hit the guide side 35 because the sensor 40B does not detect it. Furthermore, since the sensors 40B and 40C do not detect and the sensor 40D detects, it can be determined that the small edge E4 is not parallel to the spine E1.

  As described above, only when the sensors 40A, 40B, 40C, and 40D sense, and the other sensors 40E and 40F do not sense, it is determined to be normal, and otherwise it is determined to be defective. In addition, since the detection of each part by the sensor 40 is performed in a state in which the signature B is securely put on the right angle ruler 30 and stopped, the inspection can be performed with high accuracy.

Next, the process of signature after the perpendicularity determination will be described.
As shown in FIG. 1B, a pair of conveying belt assemblies 50 are disposed downstream of the right-angle ruler 30. A discharge tray 51 is disposed below the right-angle ruler 30.
The signature determined to be normal (non-defective) is sent to the next process (stacking device) through the conveyor belt 50. On the other hand, the signature determined to be defective is discharged by the discharge mechanism.

FIG. 4 is a diagram illustrating the discharge mechanism.
As shown in FIG. 4A, the signature B is inspected by the above-described method in a state where the spine E1 is stopped by contacting the stopper side 33 of the right-angle ruler 30. When it is determined that the signature B is normal, the right-angle ruler 30 (stopper side 33) is raised as shown in FIG. 4B, and the signature B is fed from the spine E1 to the conveyor belt assembly 50. The process proceeds to the next step. During this time, the right angle ruler 30 remains raised.

  On the other hand, when it is determined that the signature B is defective, as shown in FIG. 4 (B), the right angle ruler 30 is raised and then immediately lowered as shown in FIG. 4 (C). Then, the signature B is discharged from the feeding means 10 while the end on the back side of the upper surface of the signature B is pushed downward by the lower end of the stopper side 33 of the right-angle ruler 30. The signature B is sent out from the back E1 in the direction of the tray 51, and when the signature B is completely discharged from the feeding means 30, the signature B is received by the tray 51. Thereafter, the stopper side 33 rises to the height of the base.

It is a figure which shows schematic structure of the signature cutting defect detection apparatus which concerns on embodiment of this invention, FIG. 1 (A) is a top view, FIG.1 (B) is a side view. FIG. 2 is a plan view showing the arrangement of sensors of the folded cutting defect detection device of FIG. It is a figure which shows the example of a detection of the signature cutting defect detection apparatus of FIG. It is a figure explaining a discharge mechanism. It is a figure explaining an example of a three-way cutting method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Folding cutting defect detection apparatus 10 Feed means 11, 17 Belt conveyor 13, 19 Roller 15, 21 Belt 25 Conveyance path 30 Right angle ruler 31 Corner 33 Stopper side 35 Guide side 39 Sensor attachment member 40 Sensor 50 Conveyance belt assembly 51 Discharge tray

Claims (5)

A device that detects a cutting failure of a material obtained by cutting the other three sides based on the back of the eclectic (cut eclectic signature),
Feeding means for feeding the eclectic spine first;
A right angle ruler that hits the back of the signature and one side that should be perpendicular to it,
Means for detecting a gap between the right angle ruler and each side of the signature applied thereto;
Comprising
In the feeding means, the signature is sent obliquely and applied to the right angle ruler to stop the signature.
An apparatus for detecting a failure in cutting a fold, wherein the perpendicularity of the fold is inspected from a gap between each abutting side of the ruler and the back and the side. The means for detecting the gap is
Sensor A arranged at the corner of the right angle ruler,
Sensor B arranged on the right side of the right-angle ruler on the side where the side of the signature is applied, and located away from the corner by the width of the signature to be inspected,
Sensors C, D, which are arranged at a predetermined interval on a line passing through the position where the sensor B is arranged and extending in parallel with the side of the right-angle ruler to which the spine of the signature is applied.
Parallel to the side of the right-angle ruler on which the spine of the right angle ruler is applied, separated from the sensor B by a predetermined interval (about a dimensional tolerance) in a direction away from the side of the right-angle ruler on which the back of the signature is applied. Sensors E, F, which are arranged at predetermined intervals on the extending line,
Have
When the sensors A and B sense a signature, the back and sides of the signature are determined to be orthogonal,
When one of the sensors A and B does not sense a signature, it is determined that the back and sides of the signature are not orthogonal,
2. The sensor according to claim 1, wherein when the sensors B, C, and D sense a signature and the sensors E and F do not sense a signature, the width of the signature is determined to be within a tolerance range. The eclectic cutting defect detection device according to 1. Further, a sensor disposed at a predetermined interval on a line separated from the side to which the side of the signature of the right-angle ruler is applied by the height of the signature to be inspected (the width of the back and the small edge). G, H,
The folding ruler of the right angle ruler separated from the position where the sensors G and H are arranged by a predetermined interval (about dimensional tolerance) in a direction away from the side to which the side of the signature of the right angle ruler is applied. Sensors I, J, which are arranged at predetermined intervals on a line extending in parallel with the side to which the side is applied
Have
3. The height of the signature is determined to be within a tolerance range when the sensors G and H sense a signature and the sensors I and J do not sense a signature. The eclectic cutting defect detection device described.   When a failure of the cut signature is detected, the right-angle ruler is raised and the signature is advanced by the feeding means before the right-angle ruler, and then the right-angle ruler is lowered to move the signature in the traveling direction. 4. The fold cutting failure detection device according to claim 1, wherein the fold is discharged by guiding the front end downward. A method for detecting a cutting defect of a material obtained by cutting the other three sides based on the back of the eclectic (cut eclectic),
Send the eclectic back first,
Put the back of the signature and one side that should be at right angles to the two sides of the right angle ruler,
A method for detecting a failure in cutting a fold, wherein a perpendicularity of the fold is detected by detecting a gap between the right angle ruler and each side of the fold applied to the ruler.

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