JP5287097B2 - Saddle stitch wire defect inspection system - Google Patents

Description

  The present invention relates to a saddle stitching wire defect inspection apparatus for inspecting a wire stitching defect of a book that has been collated or wire-bound by a saddle stitching machine.

  First, the saddle stitch bookbinding process will be described. The saddle stitcher superimposes the printed signatures in the knitting order specified in the specifications. Next, the stacked signatures are bound together with a wire, and unnecessary portions are cut off by a three-way cutting mechanism.

  In this binding process, a method is often used in which the wire is sent out toward the signature, and the penetrating wire is folded and bound. A defect or a defect that the wire cannot be bound inside the book may occur. In this specification, a book includes a signature.

  As for the defect in which the wire jumps out from the back of the book, a long belt-like laser beam is irradiated to a predetermined range including the back of the integrated signature by a projector, and this laser beam is moved up and down on a light receiving element such as a CCD. There is a proposal of a device that detects the protrusion of a binding wire from the position of a light receiving element that receives a laser beam by receiving a laser beam having an arrayed line sensor (see Patent Document 1). In addition, there has been proposed an apparatus that measures the interval between a paper piece or signature and a binding tool, and determines that the binding tool is defective when the interval is not a fixed value (see Patent Document 2).

  However, in such a conventional apparatus, it is impossible to detect a defect in which the wire is not bound inside the book. If the wire stands inside the book without binding, the binding foot of the wire may cause an accident that hurts a person's hand, which is a serious defect. In order to prevent such a wire binding failure from flowing out, it is necessary for a person to open a book part by part and visually inspect it, which requires a lot of time and money. Moreover, in the visual inspection process by a person, there is a possibility that the wire binding leg defect may be leaked due to a human work error.

Japanese Patent Laid-Open No. 10-58854 JP 2000-238461 A

  An object of the present invention is to provide a saddle stitching wire defect inspection device that can detect a defect in which a wire cannot be bound inside a book.

Binding wire defect inspection apparatus in according to the invention of claim 1 is a binding wire defect inspecting apparatus in detecting defects present in the stapled foot stapled being conveyed in a predetermined direction, of the book wire Book transporting means for transporting the book closed in a direction orthogonal to the extending direction, wire magnetizing means for magnetizing the book wire, book detection means for detecting the book passing through a predetermined position, and When the book is detected by the book detection means, the magnetic field strength of the book wire at two locations spaced equidistantly along the extending direction across the center in the extending direction of the book wire is first determined. First magnetic field strength detecting means and second magnetic field strength detecting means for detecting magnetic field strength and second magnetic field strength, respectively, and a peak value of the first magnetic field strength detected by the first magnetic field strength detecting means and the second magnetic field. Detected by intensity detection means Whether the difference from the peak value of the second magnetic field strength exceeds a predetermined first threshold value, or both the peak value of the first magnetic field strength and the peak value of the second magnetic field strength And a pass / fail judgment means for judging pass / fail according to whether or not exceeds a predetermined second threshold value .

Binding wire defect inspection apparatus in according to the invention of claim 2 is the binding wire defect inspecting apparatus in detecting defects present in the stapled foot stapled being conveyed in a predetermined direction, of the book wire Book transporting means for transporting the book closed in a direction orthogonal to the extending direction, wire magnetizing means for magnetizing the book wire, book detection means for detecting the book passing through a predetermined position, and When the book is detected by the book detection means, the magnetic field strength of the book wire at two locations spaced equidistantly along the extending direction across the center in the extending direction of the book wire is first determined. A first magnetic field strength detecting means and a second magnetic field strength detecting means for detecting the magnetic field strength and the second magnetic field strength, respectively, and the first magnetic field strength detected by the first magnetic field strength detecting means is not less than a predetermined threshold value. Measure a certain first time Rutotomoni, wherein the time measuring means for measuring a second time the second magnetic field intensity detected by the second magnetic field strength detecting means is greater than or equal to the threshold value, the first hour and the measured by the time measuring means And a pass / fail judgment means for judging pass / fail according to whether or not both of the second times exceed a preset time .

Binding wire defect inspection apparatus in according to the invention of claim 3 is the binding wire defect inspecting apparatus in detecting defects present in the stapled foot stapled being conveyed in a predetermined direction, of the book wire Book transport means for transporting the book in an open direction in a direction parallel to the extending direction, wire magnetizing means for magnetizing the book wire, book detection means for detecting the book passing through a predetermined position, and Magnetic field strength detection means for detecting the magnetic field strength of the book wire when the book is detected by the book detection means, and a threshold value for which the peak value of the magnetic field strength detected by the magnetic field strength detection means is predetermined. Pass / fail judgment means for judging pass / fail according to whether or not the value exceeds the threshold.

A saddle stitching wire defect inspection device according to a fourth aspect of the invention is a saddle stitching wire defect inspection device that detects a wire stitching foot defect of a wire binding book being conveyed in a predetermined direction . Book transport means for transporting the book in an open direction in a direction parallel to the extending direction, wire magnetizing means for magnetizing the book wire, book detection means for detecting the book passing through a predetermined position, and Magnetic field strength detection means for detecting the magnetic field strength of the book wire when the book is detected by the book detection means, and a threshold value for which the peak value of the magnetic field strength detected by the magnetic field strength detection means is predetermined. Time measuring means for measuring the time as described above, and pass / fail judgment means for judging pass / fail according to whether or not the time measured by the time measuring means exceeds a preset time. .

  According to the present invention, by detecting the book that magnetizes a book wire and passes through a predetermined position, and detects the magnetic field strength of the book wire when the book is detected, Therefore, it is possible to detect a defect that the wire cannot be bound.

  In addition, according to the present invention, it is possible to detect a defect in which the wire is not bound inside the book, and therefore, it is possible to prevent the outflow of a serious defect that may cause an accident in which the binding foot of the wire hurts a person's hand. In addition, it is possible to omit a visual inspection process in which a person opens a book part by part, and it is possible to reduce the inspection time and the cost required for the inspection.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a schematic view showing a saddle stitch wire defect inspection apparatus according to Embodiment 1 of the present invention. The saddle stitch wire defect inspection apparatus according to the first embodiment of the present invention includes a main conveying unit 20, a wire magnetizing unit 11a, 11b, a main detecting unit 14, a magnetic field strength detecting unit 12a, 12b, 12c, 12d, Pass / fail judgment means 15.

The main transport unit 20 transports the book P in the transport direction A with the book P closed.
Specifically, the closed book P is placed on the placement surface of the book transport means 20 with the back or front edge bound by the wires 13a and 13b facing the downstream side in the transport direction A. In this state, it is transported in the transport direction A by the main transport means 20. In addition, when the saddle stitch wire defect inspection apparatus of the present embodiment is installed on the transport path of the book P on the saddle stitch bookbinding machine and the book P is transported in the above-described state, the saddle stitch bookbinding is performed. It is also possible to use the main conveying means of the machine as the main conveying means 20.
The wire magnetizing means 11a and 11b magnetize the wire P 13a and 13b of the book P. The book detection means 14 detects the book P passing through a predetermined position. The magnetic field strength detection means 12a, 12b, 12c, and 12d detect the magnetic field strength of the wire P of the book P when the book P is detected by the book detection means 14. The pass / fail judgment means 15 judges pass / fail depending on whether the magnetic field strengths detected by the magnetic field strength detection means 12a, 12b, 12c, and 12d are within the normal range.

  The transport unit 20 is composed of, for example, a transport belt. The wire magnetizing means 11a, 11b and the magnetic field intensity detecting means 12a, 12b, 12c, 12d are arranged below the book P to be transported, and are located at locations corresponding to the back side and the ground side of the book P. It is installed and magnetizes the two wires 13a and 13b of the book P. The wire magnetizing means 11a and 11b are composed of, for example, a permanent magnet or an electromagnet. This detection means 14 is comprised by the photoelectric sensor etc., for example.

  The magnetic field strength detection means 12a, 12b, 12c, 12d are configured by, for example, a Hall element, a magnetic impedance element, a flux gate element, an MR element, or the like. The magnetic field intensity detection means 12a, 12b, 12c, and 12d are arranged so that the magnetic field component in the transport direction A of the book P can be detected with high sensitivity. The magnetic field intensity detection means 12a and 12b are arranged so that the center thereof coincides with the center of the ground wire 13. The magnetic field strength detection means 12c and 12d are arranged so that the center thereof coincides with the center of the top wire 13. The pass / fail judgment means 15 is composed of, for example, a microcomputer.

  In this saddle stitching wire defect inspection device, it is possible to detect a binding leg defect of the wire 13 as follows. However, in the case of FIG. 1, the book P has a rectangular shape and is transported so that the side B1 of the book P is parallel to the transport direction A.

  When the front side B0 in the transport direction A of the book P being transported in the transport direction A reaches the book detection means 14, the book detection means 14 detects the book P. When the main detection unit 14 detects the main P, the magnetic field strength detection units 12a, 12b, 12c, and 12d continuously detect the magnetic field strength.

  Here, the quality determination operation of the wire binding leg shape by the quality determination means 15 will be described. FIG. 2A is a schematic diagram showing the shape of normal binding legs of the wires 13a and 13b. FIG. 2 (B) is a schematic diagram showing a poorly spelled product on one leg of the wire 13a. FIG. 2 (C) is a schematic diagram showing a poorly spelled product on both legs of the wire 13a.

  In the case of the normal products of the wires 13a and 13b in FIG. 2A, the shapes thereof are substantially symmetric around the center of the wires 13a and 13b. Therefore, the peak values of the magnetic field strength detected by the magnetic field strength detection means 12a and 12b are substantially equal. Further, the peak values of the magnetic field strength detected by the magnetic field strength detection means 12c and 12d are substantially equal. Therefore, (the peak value of the magnetic field intensity detected by the magnetic field intensity detecting means 12a) − (the peak value of the magnetic field intensity detected by the magnetic field intensity detecting means 12b) ≈0 and (the magnetic field intensity detected by the magnetic field intensity detecting means 12c) (Peak value) − (peak value of magnetic field intensity detected by the magnetic field intensity detecting means 12d) ≈0.

  When an incompletely spelled product on one leg of the wire 13a in FIG. 2B is inspected, it becomes asymmetric about the center of the wire 13ba, so that a difference occurs in the peak value of the magnetic field strength detected by the magnetic field strength detecting means 12a and 12b. . Using the difference between the peak values and a threshold value set in advance, the pass / fail judgment unit 15 calculates (the peak value of the magnetic field strength detected by the magnetic field strength detection unit 12a) − (the peak value of the magnetic field strength detected by the magnetic field strength detection unit 12b). )}> Whether or not it is a threshold, and {(peak value of magnetic field strength detected by the magnetic field strength detection means 12c) − (peak value of magnetic field strength detected by the magnetic field strength detection means 12d)}> It is possible to determine the spelling failure of one leg of the wire 13 depending on whether or not.

  When the poorly spelled product of both legs of the wire 13a in FIG. 2C is inspected, the peak value of the magnetic field strength detected by the magnetic field strength detecting means 12a, 12b, 12c, 12d is larger than that of the normal product of the wire 13. Using the peak value of the magnetic field strength and a preset threshold value, the pass / fail judgment unit 15 determines whether (the peak value of the magnetic field strength detected by the magnetic field strength detection unit 12a)> the threshold value or not (the magnetic field strength detection unit 12b. Whether or not (peak value of magnetic field strength detected by the magnetic field strength detection means 12c)> (peak value of magnetic field strength detected by the magnetic field strength detection means 12c)> whether or not (threshold detection means 12d detects). It is possible to determine the spelling failure of both legs of the wire 13 depending on whether or not the peak value of the magnetic field strength to be satisfied> the threshold value.

  The book P determined to be defective by the pass / fail determination unit 15 is discharged from a normal product conveyance path by a defective product discharge unit (not shown).

(Embodiment 2)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 is a schematic diagram showing a saddle stitch wire defect inspection apparatus according to Embodiment 2 of the present invention. In the second embodiment of the present invention, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description thereof is omitted.

  The saddle stitching wire defect inspection apparatus according to the second embodiment of the present invention includes a time measurement unit 16 and a quality determination unit 17 instead of the quality determination unit 15 in the first embodiment of the present invention. That is, the saddle stitch wire defect inspection apparatus according to the second embodiment of the present invention includes a main conveying unit 20, a wire magnetizing unit 11a, 11b, a main detecting unit 14, and a magnetic field strength detecting unit 12a, 12b, 12c, 12d. And a time measuring means 16 and a pass / fail judgment means 17.

  The time measuring means 16 is connected to the magnetic field strength detecting means 12a, 12b, 12c, 12d. The time measuring means 16 measures the time during which the magnetic field strength detected by the magnetic field strength detecting means 12a, 12b, 12c, 12d is equal to or greater than a predetermined threshold value. The pass / fail judgment means 17 is connected to the time measurement means 16. The pass / fail determination means 17 performs pass / fail determination based on whether the time measured by the time measurement means 16 is within the normal range.

  Here, the quality determination operation of the binding shape of the wire 13 by the quality determination means 17 will be described. Compared to the case where the normal product of the wire 13 of FIG. 2A is inspected, the poorly spelled product of one foot of the wire 13a of FIG. 2B and the poorly spelled product of both feet of the wire 13a of FIG. Is measured, it takes a long time for the wire 13 to pass right above the magnetic field intensity detecting means. By using the time when the magnetic field strength is equal to or greater than a predetermined threshold value set in advance and the time set in advance, it is possible to determine a binding failure of the saddle stitching wire as follows.

  The pass / fail judgment means 17 determines whether or not the time when the magnetic field strength detected by the magnetic field strength detection means 12a is greater than or equal to a predetermined threshold> the time set in advance, or the magnetic field strength detected by the magnetic field strength detection means 12b is greater than or equal to the predetermined threshold. Whether or not it is a preset time, whether or not the magnetic field strength detected by the magnetic field strength detecting means 12c is equal to or greater than a predetermined threshold, and whether or not it is a preset time, and the magnetic field strength detecting means 12d. Whether the saddle stitch wire is defective or not can be determined by whether or not the time when the magnetic field intensity detected is equal to or greater than a predetermined threshold value> a preset time.

  The book P determined to be defective by the pass / fail determination means 17 is discharged from a normal product conveyance path by a defective product discharge means (not shown).

(Embodiment 3)
Next, a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is a schematic front view showing a saddle stitch wire defect inspection apparatus according to Embodiment 3 of the present invention. FIG. 5 is a schematic side view showing a saddle stitch wire defect inspection apparatus according to Embodiment 3 of the present invention. In the third embodiment of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 4 and 5, the saddle stitching wire defect inspection apparatus according to the third embodiment of the present invention includes a main conveying means 21, a wire magnetizing means 11, a main detecting means 14, and a magnetic field strength detecting means 12. And a pass / fail judgment means 23.

The book transport means 21 transports the book P in the transport direction A with the book P opened.
In detail, the closed book P is inserted with the signature holding members 22a and 22b between the body with the back bound by the wire 13 facing up and the forehead facing down, and the book P includes the signature holding member 22a, 22b.
Conveying chains 21a and 21b are connected to the inside of the signature holding members 22a and 22b, and the book P is moved toward the downstream side in the conveying direction A together with the signature holding members 22a and 22b by the movement of the conveying chains 21a and 21b. Be transported.
The wire magnetizing means 11 magnetizes the wire 13 of the book P. The book detection means 14 detects the book P passing through a predetermined position. The magnetic field strength detection means 12 detects the magnetic field strength of the wire 13 of the book P when the book P is detected by the book detection means 14. The pass / fail judgment means 23 judges pass / fail according to whether the magnetic field strength detected by the magnetic field strength detection means 12 is within a normal range.
The wire magnetizing means 11 and the magnetic field strength detecting means 12 are disposed inside the signature holding members 22a and 22b.

The main transport means 21 includes transport chains 21a and 21b and signature holding members 22a and 22b, and transports in the transport direction A by the transport chains 21a and 21b with the book P opened by the signature holding members 22a and 22b. To do.
In FIG. 5, reference numeral 2102 denotes a positioning member provided on the signature holding members 22a and 22b. The positioning member 2102 moves together with the signature holding members 22a and 22b.
The saddle stitching wire defect inspection apparatus of the present embodiment is installed on the transport path of the book P on the saddle stitch bookbinding machine, and the saddle stitch bookbinding machine has a transport means configured as the book transport means 21; When the book P is transported in the state as described above, the book transport means of the saddle stitch bookbinding machine can be used as the book transport means 21. In the main conveying means 21 of the saddle stitching bookbinding machine, the conveying chains 21a and 21b are usually constituted by a gathering chain.

  The wire magnetizing means 11 is composed of, for example, a permanent magnet, an electromagnet or the like. The magnetic field strength detection means 12 is composed of, for example, a Hall element, a magnetic impedance element, a fluxgate element, an MR element, or the like. The magnetic field intensity detecting means 12 is arranged so that it can detect with high sensitivity the magnetic field component in the direction parallel to the side B0 in the transport direction of the book P. The magnetic field strength detection means 12 is composed of, for example, a Hall element, a magnetic impedance element, a fluxgate element, or an MR element.

  In the saddle stitching wire defect inspection apparatus according to the second embodiment of the present invention, it is possible to detect a binding leg defect of the wire 13 as follows. However, in the case of FIGS. 4 and 5, it is assumed that the book P is conveyed in an open state by the signature holding members 22a and 22b.

  When the front side B0 in the transport direction A of the book P being transported in the transport direction A reaches the book detection means 14, the book detection means 14 detects the book P. When the main detection unit 14 detects the main P, the magnetic field strength detection unit 12 continuously detects the magnetic field strength.

  Here, the quality determination operation of the binding shape of the wire 13 by the quality determination means 23 will be described. FIG. 6A is a schematic diagram showing the shape of normal binding legs of the wires 13a and 13b. FIG. 6B is a schematic diagram showing a poorly spelled product on one leg of the wire 13b. FIG. 6C is a schematic view showing a defective product of the wire 13b.

  Compared with the case where the normal products of the wires 13a and 13b in FIG. 6A are inspected, the magnetic field strength detecting means 12 and the wire 13b are measured when the defective binding material of the wires 13b as shown in FIG. 6B is measured. Since the distance between and becomes shorter, the peak value of the magnetic field strength becomes larger. Using the peak value of the magnetic field strength and the threshold value set in advance, the pass / fail judgment means 23 determines whether or not both feet of the wire 13 depend on whether (peak value of the magnetic field strength detected by the magnetic field strength detection means 12)> threshold value. A spelling failure can be determined.

  The book P determined to be defective by the pass / fail determination means 23 is discharged from the normal product conveyance path by the defective product discharge means (not shown).

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7 is a schematic front view showing a saddle stitch wire defect inspection apparatus according to Embodiment 4 of the present invention. FIG. 8 is a schematic side view showing a saddle stitch wire defect inspection apparatus according to Embodiment 4 of the present invention. In the fourth embodiment of the present invention, the same components as those in the third embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  The saddle stitching wire defect inspection apparatus according to the fourth embodiment of the present invention includes a time measurement unit 24 and a quality determination unit 25 in place of the quality determination unit 23 in the third embodiment of the present invention. That is, the saddle stitching wire defect inspection apparatus according to the fourth embodiment of the present invention includes a main conveying unit 21, a wire magnetizing unit 11, a main detecting unit 14, a magnetic field strength detecting unit 12, a time measuring unit 24, Pass / fail judgment means 25.

  The time measuring unit 24 is connected to the magnetic field strength detecting unit 12. The time measuring unit 24 measures a time during which the magnetic field strength detected by the magnetic field strength detecting unit 12 is equal to or greater than a predetermined threshold. The pass / fail judgment means 25 is connected to the time measurement means 24. The pass / fail judgment unit 25 judges pass / fail based on whether the time measured by the time measuring unit 24 is within the normal range.

  Here, the quality determination operation of the binding shape of the wire 13 by the quality determination means 25 will be described. Compared with the case where the normal products of the wires 13a and 13b in FIG. 6A are inspected, when the non-stick product of the wire 13b as shown in FIG. 6C is measured, the wire directly above the magnetic field strength detecting means 12 is measured. The time for 13b to pass increases. Using the time when the magnetic field strength is greater than or equal to a predetermined threshold value and the time set in advance, the pass / fail judgment means 25 (the time when the magnetic field strength value detected by the magnetic field strength detection means 12 is greater than or equal to the predetermined threshold value) )> It is possible to determine whether the saddle stitch wire 13 has a stitch failure due to whether or not it is a preset time.

  The book P determined to be defective by the pass / fail determination means 25 is discharged from the normal product conveyance path by the defective product discharge means (not shown).

It is the schematic which shows the saddle stitch wire defect inspection apparatus concerning Embodiment 1 of this invention. FIG. 2 (A) is a schematic diagram showing the shape of a normal binding leg of the wire according to the first embodiment of the present invention, and FIG. 2 (B) is a diagram of one leg of the wire according to the first embodiment of the present invention. FIG. 2C is a schematic diagram showing a poorly spelled product, and FIG. 2C is a schematic diagram showing a poorly spelled product on both feet of the wire according to Embodiment 1 of the present invention. It is the schematic which shows the saddle stitch wire defect inspection apparatus concerning Embodiment 2 of this invention. It is a schematic front view which shows the saddle stitch wire defect inspection apparatus concerning Embodiment 3 of this invention. It is a schematic side view which shows the saddle stitch wire defect inspection apparatus concerning Embodiment 3 of this invention. FIG. 6 (A) is a schematic diagram showing the shape of a normal binding leg of the wire according to the third embodiment of the present invention, and FIG. 6 (B) is a diagram of one leg of the wire according to the third embodiment of the present invention. FIG. 6 (C) is a schematic diagram showing a defective wire sticking product according to Embodiment 3 of the present invention. It is a schematic front view which shows the saddle stitch wire defect inspection apparatus concerning Embodiment 4 of this invention. It is a schematic side view which shows the saddle stitch wire defect inspection apparatus concerning Embodiment 4 of this invention.

Explanation of symbols

11, 11a, 11b Wire magnetizing means 12, 12a, 12b, 12c, 12d Magnetic field intensity detecting means 13, 13a, 13b Wire 14 This detecting means 15, 17, 23, 25 Pass / fail judgment means 16, 24 Time measuring means 20, 21 Book transport means 21a, 21b transport chain 22a, 22b signature holding member P book

Claims (4)

A saddle stitching wire defect inspection device for detecting a wire stitching foot defect of a wire binding book being conveyed in a predetermined direction,
Book transport means for transporting the book in a closed state in a direction perpendicular to the extending direction of the wire of the book;
Wire magnetizing means for magnetizing the book wire;
Book detection means for detecting the book passing through a predetermined position;
When the book is detected by the book detection means , the magnetic field strength of the book wire at two locations spaced equidistantly along the extending direction across the center in the extending direction of the book wire is measured. A first magnetic field strength detecting means and a second magnetic field strength detecting means for detecting the first magnetic field strength and the second magnetic field strength, respectively .
The difference between the peak value of the first magnetic field strength detected by the first magnetic field strength detection means and the peak value of the second magnetic field strength detected by the second magnetic field strength detection means is a predetermined first value. The pass / fail judgment is performed based on whether the threshold value is exceeded or whether both the peak value of the first magnetic field strength and the peak value of the second magnetic field strength exceed a predetermined second threshold value. Means,
A saddle stitch wire defect inspection device comprising: A saddle stitching wire defect inspection device for detecting a wire stitching foot defect of a wire binding book being conveyed in a predetermined direction,
Book transport means for transporting the book in a closed state in a direction perpendicular to the extending direction of the wire of the book;
Wire magnetizing means for magnetizing the book wire;
Book detection means for detecting the book passing through a predetermined position;
When the book is detected by the book detection means , the magnetic field strength of the book wire at two locations spaced equidistantly along the extending direction across the center in the extending direction of the book wire is measured. A first magnetic field strength detecting means and a second magnetic field strength detecting means for detecting the first magnetic field strength and the second magnetic field strength, respectively .
The first magnetic field strength detected by the first magnetic field strength detector is measured for a first time that is equal to or greater than a predetermined threshold, and the second magnetic field strength detected by the second magnetic field strength detector is Time measuring means for measuring a second time that is equal to or greater than the threshold ;
Pass / fail determination means for determining pass / fail by whether or not both the first time and the second time measured by the time measuring means exceed a preset time ;
A saddle stitch wire defect inspection device comprising: A saddle stitching wire defect inspection device for detecting a wire stitching foot defect of a wire binding book being conveyed in a predetermined direction,
Book transport means for transporting the book in an open state in a direction parallel to the extending direction of the wire of the book;
Wire magnetizing means for magnetizing the book wire;
Book detection means for detecting the book passing through a predetermined position;
Magnetic field strength detection means for detecting the magnetic field strength of the book wire when the book is detected by the book detection means;
Pass / fail judgment means for judging pass / fail according to whether a peak value of the magnetic field strength detected by the magnetic field strength detection means exceeds a predetermined threshold ;
A saddle stitch wire defect inspection device comprising: A saddle stitching wire defect inspection device for detecting a wire stitching foot defect of a wire binding book being conveyed in a predetermined direction,
Book transport means for transporting the book in an open state in a direction parallel to the extending direction of the wire of the book;
Wire magnetizing means for magnetizing the book wire;
Book detection means for detecting the book passing through a predetermined position;
Magnetic field strength detection means for detecting the magnetic field strength of the book wire when the book is detected by the book detection means;
Time measuring means for measuring a time during which a peak value of the magnetic field strength detected by the magnetic field strength detecting means is equal to or greater than a predetermined threshold;
Pass / fail determination means for performing pass / fail determination based on whether or not the time measured by the time measuring means exceeds a preset time;
A saddle stitch wire defect inspection device comprising:

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