JP3941919B2 - Sheet monitoring method, apparatus therefor, and folding machine using the same - Google Patents

Sheet monitoring method, apparatus therefor, and folding machine using the same Download PDF

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Publication number
JP3941919B2
JP3941919B2 JP2001389878A JP2001389878A JP3941919B2 JP 3941919 B2 JP3941919 B2 JP 3941919B2 JP 2001389878 A JP2001389878 A JP 2001389878A JP 2001389878 A JP2001389878 A JP 2001389878A JP 3941919 B2 JP3941919 B2 JP 3941919B2
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Japan
Prior art keywords
thickness
signature
sheet
measuring
thickness distribution
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JP2001389878A
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JP2003182884A (en
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栄一朗 川嶋
和弘 斉木
隆 川久保
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Toyo Ink SC Holdings Co Ltd
Toppan Inc
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Toyo Ink SC Holdings Co Ltd
Toppan Inc
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  • Controlling Sheets Or Webs (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、主に印刷シート、折り丁などにおける角折れ・千切れなどの不良を検出する方法、装置、及びその利用装置に関する。
【0002】
【従来の技術】
印刷用紙の片面或いは両面に画像が転写された印刷シートを折り、断裁し、所望の形状に仕上げる印刷機としては、例えばオフセット輪転印刷機、グラビア印刷機などがあり、新聞、ちらし、書籍と言った様々な印刷物を作製している。これらの印刷機においては、後段に併設した印刷シート折り機により、連続的に所定の折り形状に折り加工して、印刷物の折り丁を作製している。
【0003】
印刷物の品質を考えた場合、印刷された画像の品質は元より、印刷物の折り品質も、その印刷物全体の品質を決める重要な要素である。例えば、製本する場合に、綴じ込み用印刷シートの角が折れた状態で本となり、最後の断裁工程で断裁されずに、余分なシート余白部が残ってしまう、あるいは、ページの一部が千切れ、そこにあるべき文字が読めなくなるなどすると、印刷された画像がきれいな印刷物であっても、最終製品の印刷物としては不良品となってしまう。
【0004】
従来、印刷工程における不良折り丁の発見は、印刷オペレータが印刷された折り丁を定期的に抜き取って検査するのが一般的であった。しかしながら、折り丁の不良は突発的に発生するものであり、定期的な抜き取り検査では見逃す可能性もあり、そのまま製本した場合、不良の本や雑誌を作製し、次の工程で不良が発見されなければ、そのまま製品として流通する恐れがあった。
【0005】
この印刷物の折り工程で発生する不良品の検出精度を上げるために、抜き取り検査の周期を短くすることも考えられるが、オペレータによる印刷作業中の検査頻度には自ずと限界があり、現状以上の頻度で折り品質をチェックすることは実際には難しいと言う問題点があった。
【0006】
【発明が解決しようとする課題】
本発明は上記の問題点に鑑みなされたものであり、その目的とするところは、折り丁を含むシートを搬送するラインまたは折り機などにおいて、シート端部に発生し易い角折れ、千切れなどを検出し、折り機などの動作タイミングの調整、部品の交換、不良品の抜き取り作業などが迅速、且つ、確実に行えるようにすることとを目的とする。
【0007】
【課題を解決するための手段】
上記目的を達成するための第1の発明は、軸方向と周方向に所定の間隔で複数の厚み計測手段を備えた計測ローラと潰しローラとの間にシートを通過させて1シート内の厚み分布を計測し、その計測した厚み分布を解析し、厚み分布の変動の大きさからシートの千切れなどの局部的不在、角折れなどの局部的重複を検出することを特徴とするシート監視方法である。
【0008】
第2の発明は、軸方向と周方向に所定の間隔で複数の厚み計測手段を備えた計測ローラと潰しローラとからなる一対のローラと、厚み計測手段が検出した厚みデータを解析するデータ解析手段と、データ解析手段が1シート内の厚み分布に所定値を超える変動を検出したときに所要の情報を出力する情報出力手段とを備えたことを特徴とするシート監視装置である。
【0009】
第3の発明は、前記シート監視装置を備えたことを特徴とする折り機である。
【0010】
本発明は、角折れや千切れなどの不良部分の厚みが他の正常な部分と比較して厚くまたは薄くなることに着目し、シートの厚みを計測し、その厚み分布を縦方向または横方向あるいはその両方向で解析することで、折り丁などを含むシートの不良を発見できるようにしたものである。
【0011】
【発明の実施の形態】
以下、本発明の一実施形態を、図面に基づいて詳細に説明する。
【0012】
図1は、本発明のシート監視装置1のブロック図である。図1において、10は折り丁(課題を解決する手段で言うシート)100の厚みを計測する計測手段であり、折り丁100の所網の部位の厚みを計測する。20はデータ解析判定手段であり、信号入力部21、記憶部22、演算処理部23、信号出力部24などからなる。30はデータ解析判定手段20から所定の制御信号が出力されたときに動作する警報手段である。
【0013】
そして、計測手段10により計測された折り丁100の厚みデータは、データ解析判定手段20の信号入力部21を介して取り込まれ、記憶部22に一時的に記憶され、演算処理部23により演算処理され、厚み分布が求められる。厚み分布の変動の大きさが所定値を超えているときには、信号出力部24を介して警報手段30に所定の制御信号が出力される。
【0014】
データ解析判定手段20の信号出力部24から所定の制御信号を入力した警報手段30は動作し、(1)警報音を吹鳴する、(2)ランプを点滅する、などして、例えば印刷機のオペレータに対し警報を発する。
【0015】
図2は、本発明のシート監視装置1の計測手段10を示す説明図である。上流側の図示しない折り機により折り加工された折り丁100は、チョッパーブレード50によりチョッパー折りされ、潰しローラ11と計測ローラ12の間を通過して下流側の搬送ラインへと送られる過程で、折り丁100の厚さが計測される。
【0016】
計測ローラ12には、軸方向と周方向に所定の間隔、例えば5mm間隔で多数のロードセル13が厚み計測手段として埋め込まれている。そして、潰しローラ11と計測ローラ12との間を通過する折り丁100の厚みとロードセル13が受ける力の大きさとの相関関係はデータ解析判定手段20の記憶部22に記憶されていて、ロードセル13が受ける力の大きさにより、潰しローラ11と計測ローラ12との間を通過している折り丁100の厚みが演算可能になっている。
【0017】
すなわち、潰しローラ11と計測ローラ12との間を折り丁100が通過する際にロードセル13に作用する力の大きさを計測することで、その力の大きさから折り丁100の厚みを算出することが可能であり、したがってその厚みの変化から折り丁100の千切れ、角折れ、すなわち重なりなどの欠陥が検出できる。
【0018】
個々のロードセル13に作用している力の大きさは、シフトレジスタなどの技術を利用してデータ解析判定手段20の記憶部22に逐次記憶される。なお、個々のロードセル13に作用している力の大きさは、計測ローラ12内に設ける図示しない記憶手段に一時的に記憶し、それを所定時間毎に無線通信技術を利用してデータ解析判定手段20の記憶部22に記憶するように構成しても良い。
【0019】
次に、データ解析判定手段20の演算処理部23による欠陥の有無を判定するフローを、図3に示すフローチャートに従って説明する。なお。ここでx,yはカウンタであり、xmax, ymaxはカウンタの繰り返し回数、T(x,y)は各計測点(x,y)における折り丁100の厚みである。
【0020】
動作開始時には、先ずステップS1で初期設定として設定値の読み込みやキャリブレーションなどを行う。そして、その動作が終了すると計測手段10により計測された力の大きさに基づいて、データ解析判定手段20の演算処理部23が折り丁100の厚みを算出し、その算出結果に基づいて評価する。
【0021】
具体的には、例えば図5に示すような折り丁100の点線部上を計測したとすると(A)のように不良がない折り丁100Aの場合は、縦方向・横方向とも各計測点でほぼ一定の厚みとなる(T(x−1,y)≒T(x,y)≒T(x+1,y), T(x,y−1)≒T(x,y)≒T(x,y+1))。したがって、ステップS2及びステップS3で共にイエスと判定され、ステップS4で折り丁100が正常であると判定される。
【0022】
しかし、不良が発生した場合には、図5(B)の角折れがある折り丁100B、図5(C)の千切れがある折り丁100C共に、不良部分で折り丁100の厚みが変化する。
【0023】
例えば、図5(B)の角折れがある折り丁100Bの場合は、縦方向、横方向共に正常な部分と比較して折れ重なっている計測点では厚くなり、シートがなくなっている計測点では薄くなっている(T(x+1,y)<T(x−1,y)<T(x,y))。
【0024】
一方、図5(C)の千切れがある折り丁100Cの場合は、横方向の厚みを正常な部分と比較すると千切れの発生している計測点では薄くなっている (T(x−1,y)<T(x,y)≒T(x+1,y))。
【0025】
したがって、図5(B)の角折れがある折り丁100Bの場合と、図5(C)の千切れがある折り丁100Cの場合には、ステップS2またはステップS3でノーと判定され、ステップS6でその折り丁100が不良であると判定される。
【0026】
このように、同一折り丁100の厚みの比較をステップS6からステップS10に示すように縦方向、横方向共に任意の回数行うことで、折り丁100の不良の有無を判定することができる。
【0027】
また、別の判定方法としては、前述のような各計測点同士の厚さの比較を行うのでなく、或る決められた閾値と計測されたデータの値との比較を行い、閾値を超えたものを折り不良として判定することもできる。その処理判定手段の動作の例を図4のフローチャートに示す。
【0028】
これは、折り丁100の正常な厚みの範囲を、予めデータ解析判定手段20の記憶部22に記憶しておき、その数値と比較することで不良の判定を行う。ここで、折り丁100の厚みをT(x,y)、正常な折り丁100の厚みの上限値をTmax(x,y)、厚みの下限値をTmin(x,y)とする。
【0029】
先ず、ステップS11で初期設定を行う。そしてステップS12で折り丁100の厚みがTmin(x,y)<T(x,y)<Tmax(x,y)であればステップS13で正常、そうでなければステップS14で不良と判定する。
【0030】
このような判定を、ステップS16からステップS19に示すように計測点毎に行うことで、折り丁100の不良の有無を判定することができる。
【0031】
そして、折り丁100の不良の有無を判定し、不良と判定されたときには信号出力部24を介して所定の制御信号を警報手段30に送信し、警報手段30を動作させ、警報を発する。
【0032】
また、良否の判定を図示しない表示部に表示し、不良検出時には警報出力(ブザー、ランプ等)すると共に、外部出力などを可能にする構成としても良い。
【0033】
例えば、同一折り丁100において厚み分布の変動の大きさが所定値を超えたときに、図示しない排紙装置にも信号出力部24を介して所定の制御信号を出力し、発生した不良品を自動的に抜き取るように構成することも可能である。また、不良品の除去はオフラインで行うようにしても良い。
【0034】
また、ロードセル13が計測した力の大きさを折り丁100の厚みに変換し、その厚み分布の変動の大きさなどから折り丁100の不良の有無を判定するのではなく、ロードセル13が計測した力の大きさ自体の変動などを解析して折り丁100の不良の有無を判定することも可能である。
【0035】
また、折り丁100の厚みを計測するためのロードセル13は、欠陥が発生し易い部分のみの監視が可能に、チョッパーブレード50によってチョッパー折りされている折り丁100の折り開始側の所定部分、例えば折り開始端から20mmの幅の部分と、その反対側の終端側所定部分、例えばこちらも終端部から20mmの幅の部分だけの厚みが計測可能に、計測ローラ12の所定部分にのみ配設したり、その部分に配設されているロードセル13だけが折り丁100の厚みを計測するように構成し、シート監視方法またはシート監視装置1の構成の簡略化を図ることも可能である。
【0036】
また、潰しローラ11によって潰されている折り丁100の厚みは、ロードセル13以外の適宜の手段により計測されても良い。
【0037】
【発明の効果】
厚みを計測して評価する本発明によれば、折り丁などの内部で発生する角折れや千切れなどの欠陥も検出することが可能であり、不良品の発生を高い精度で検出することができるという効果を奏する。
【0038】
そのため、検査している折り丁などに前記欠陥が発生している時には、これを速やかに検知して折り動作タイミングの調整や、不良品の抜き取り作業などが迅速且つ確実に行え、次の工程に不良品が流れないようにすることができるという効果を奏する。
【図面の簡単な説明】
【図1】 本発明のシート監視装置のブロック図である。
【図2】 本発明のシート監視装置の計測手段の一例を示す説明図である。
【図3】 本発明の欠陥の有無を判定するためのフローチャートである。
【図4】 本発明の欠陥の有無を判定するためのフローチャートである。
【図5】 本発明のシート監視装置によって計測した折り丁の厚み分布の説明図であり、(A)は正常な折り丁の場合の例、(B)は角折れがある折り丁の場合の例、(C)は千切れがある折り丁の場合の例である。
【符号の説明】
1 シート監視装置
10 計測手段
11 潰しローラ
12 計測ローラ
13 ロードセル
20 データ解析判定手段
21 信号入力部
22 記憶部
23 演算処理部
24 信号出力部
30 警報手段
50 チョッパーブレード
100 折り丁
100A 正常な折り丁
100B 角折れの折り丁
100C 千切れのある折り丁
AX 厚み分布(横方向)
AY 厚み分布(縦方向)
BX 厚み分布(横方向)
BY 厚み分布(縦方向)
CX 厚み分布(横方向)
CY 厚み分布(縦方向)
[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a method and apparatus for detecting defects such as corner breaks and tears in printed sheets and signatures, and an apparatus for using the same.
[0002]
[Prior art]
Examples of printing machines that fold and cut a printing sheet with an image transferred on one or both sides of the printing paper and finish it in a desired shape include an offset rotary printing machine and a gravure printing machine, such as newspapers, flyers, and books. Various printed materials are produced. In these printing machines, a printed sheet signature is produced by continuously folding into a predetermined folding shape by a printing sheet folding machine provided in a subsequent stage.
[0003]
When considering the quality of the printed material, not only the quality of the printed image but also the folding quality of the printed material is an important factor that determines the quality of the entire printed material. For example, when bookbinding, the booklet is printed with the corners of the binding print sheet folded, and an excess sheet margin remains or the page is cut off without being cut in the final cutting process. If the characters that should be there are not readable, even if the printed image is a beautiful printed material, the printed product of the final product becomes a defective product.
[0004]
Conventionally, in order to find a defective signature in a printing process, it has been common for a printing operator to periodically take out a printed signature and inspect it. However, defects in signatures occur suddenly and may be overlooked in periodic sampling inspections. If bookbinding is performed as it is, defective books and magazines must be produced and defects must be discovered in the next step. In such a case, there is a risk of distributing the product as it is.
[0005]
In order to improve the detection accuracy of defective products generated in the folding process of printed matter, it may be possible to shorten the sampling inspection cycle. However, the frequency of inspections during printing operations by operators is naturally limited, and the frequency is higher than the current frequency. There was a problem that it was actually difficult to check the folding quality.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and the object of the present invention is, for example, in a line or a folding machine that conveys a sheet including a signature, a corner bend that is likely to occur at the end portion of the sheet, a piece of tearing, etc. The purpose of this is to enable quick and reliable operations such as adjusting the operation timing of a folding machine, replacing parts, and extracting defective products.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention for achieving the above object, a sheet is passed between a measuring roller having a plurality of thickness measuring means and a crushing roller at predetermined intervals in the axial direction and the circumferential direction, and the thickness within one sheet is determined. A sheet monitoring method characterized by measuring a distribution, analyzing the measured thickness distribution, and detecting a local absence such as a piece of a sheet, a local overlap such as a corner break from the magnitude of the fluctuation of the thickness distribution It is.
[0008]
The second invention is a data analysis for analyzing a pair of rollers including a measuring roller having a plurality of thickness measuring means and a crushing roller at predetermined intervals in the axial direction and the circumferential direction, and thickness data detected by the thickness measuring means. A sheet monitoring apparatus comprising: means; and information output means for outputting required information when the data analyzing means detects a fluctuation exceeding a predetermined value in the thickness distribution in one sheet.
[0009]
A third invention is a folding machine comprising the sheet monitoring device.
[0010]
The present invention pays attention to the fact that the thickness of defective parts such as corner breaks and shredding becomes thicker or thinner than other normal parts, measures the thickness of the sheet, and distributes the thickness distribution in the vertical or horizontal direction. Alternatively, by analyzing in both directions, it is possible to find a defective sheet including a signature.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 is a block diagram of a sheet monitoring apparatus 1 according to the present invention. In FIG. 1, reference numeral 10 denotes measurement means for measuring the thickness of a signature (a sheet referred to as means for solving a problem) 100, and measures the thickness of a portion of the network of the signature 100. Reference numeral 20 denotes data analysis determination means, which includes a signal input unit 21, a storage unit 22, an arithmetic processing unit 23, a signal output unit 24, and the like. Reference numeral 30 denotes alarm means that operates when a predetermined control signal is output from the data analysis determination means 20.
[0013]
Then, the thickness data of the signature 100 measured by the measuring unit 10 is taken in via the signal input unit 21 of the data analysis determination unit 20, temporarily stored in the storage unit 22, and processed by the arithmetic processing unit 23. And thickness distribution is obtained. When the variation of the thickness distribution exceeds a predetermined value, a predetermined control signal is output to the alarm means 30 via the signal output unit 24.
[0014]
The alarm unit 30 that receives a predetermined control signal from the signal output unit 24 of the data analysis determination unit 20 operates and (1) sounds an alarm sound, (2) blinks a lamp, etc. Alert the operator.
[0015]
FIG. 2 is an explanatory view showing the measuring means 10 of the sheet monitoring apparatus 1 of the present invention. The signature 100 folded by a not-shown folding machine on the upstream side is chopper folded by the chopper blade 50 and passes between the crushing roller 11 and the measuring roller 12 and sent to the downstream conveying line. The thickness of the signature 100 is measured.
[0016]
A large number of load cells 13 are embedded in the measuring roller 12 as thickness measuring means at predetermined intervals in the axial direction and circumferential direction, for example, at intervals of 5 mm. The correlation between the thickness of the signature 100 passing between the crushing roller 11 and the measuring roller 12 and the magnitude of the force received by the load cell 13 is stored in the storage unit 22 of the data analysis determination unit 20. The thickness of the signature 100 passing between the crushing roller 11 and the measuring roller 12 can be calculated according to the magnitude of the force received by.
[0017]
That is, by measuring the magnitude of the force acting on the load cell 13 when the signature 100 passes between the crushing roller 11 and the measuring roller 12, the thickness of the signature 100 is calculated from the magnitude of the force. Therefore, it is possible to detect defects such as tears, corner breaks, or overlaps of the signature 100 from the change in thickness thereof.
[0018]
The magnitude of the force acting on each load cell 13 is sequentially stored in the storage unit 22 of the data analysis determination unit 20 using a technique such as a shift register. The magnitude of the force acting on each load cell 13 is temporarily stored in a storage means (not shown) provided in the measuring roller 12, and this is determined by data analysis using a wireless communication technique every predetermined time. You may comprise so that it may memorize | store in the memory | storage part 22 of the means 20. FIG.
[0019]
Next, a flow for determining the presence / absence of a defect by the arithmetic processing unit 23 of the data analysis determination unit 20 will be described with reference to the flowchart shown in FIG. Note that. Here, x and y are counters, xmax and ymax are counter repetition times, and T (x, y) is the thickness of the signature 100 at each measurement point (x, y).
[0020]
At the start of the operation, first of all, the setting value is read and calibrated as an initial setting in step S1. When the operation ends, the arithmetic processing unit 23 of the data analysis determination unit 20 calculates the thickness of the signature 100 based on the magnitude of the force measured by the measurement unit 10, and evaluates based on the calculation result. .
[0021]
Specifically, for example, when measuring on the dotted line part of the signature 100 as shown in FIG. 5, in the case of a signature 100A having no defect as shown in (A), at each measurement point in both the vertical and horizontal directions. The thickness is almost constant (T (x-1, y) ≈T (x, y) ≈T (x + 1, y), T (x, y−1) ≈T (x, y) ≈T (x, y + 1)). Accordingly, it is determined that both the step S2 and the step S3 are yes, and the step 100 determines that the signature 100 is normal.
[0022]
However, when a defect occurs, the thickness of the signature 100 changes in the defective portion of both the signature 100B having a corner fold in FIG. 5B and the signature 100C having a torn piece in FIG. 5C. .
[0023]
For example, in the case of a signature 100B with a corner fold shown in FIG. 5B, the measurement points that are folded in both the vertical and horizontal directions are thicker than those that are normal, and the measurement points that the sheet is missing. It is thin (T (x + 1, y) <T (x-1, y) <T (x, y)).
[0024]
On the other hand, in the case of the signature 100C with a torn piece in FIG. 5C, the thickness at the measuring point where the torn piece is thin is smaller than the normal thickness (T (x-1 , Y) <T (x, y) ≈T (x + 1, y)).
[0025]
Therefore, in the case of the signature 100B having a corner fold in FIG. 5B and the signature 100C having a torn piece in FIG. 5C, it is determined NO in step S2 or step S3, and step S6 It is determined that the signature 100 is defective.
[0026]
As described above, the comparison of the thickness of the same signature 100 is performed at any number of times in both the vertical direction and the horizontal direction as shown in steps S6 to S10, whereby the presence or absence of the signature 100 can be determined.
[0027]
As another determination method, instead of comparing the thicknesses of the respective measurement points as described above, a certain threshold value is compared with the value of the measured data, and the threshold value is exceeded. A thing can also be determined as a folding failure. An example of the operation of the processing determination means is shown in the flowchart of FIG.
[0028]
In this case, the normal thickness range of the signature 100 is stored in advance in the storage unit 22 of the data analysis determination unit 20, and the defect is determined by comparing with the numerical value. Here, the thickness of the signature 100 is T (x, y), the upper limit value of the normal signature 100 is Tmax (x, y), and the lower limit value of the thickness is Tmin (x, y).
[0029]
First, initial setting is performed in step S11. In step S12, if the thickness of the signature 100 is Tmin (x, y) <T (x, y) <Tmax (x, y), it is determined normal in step S13, otherwise it is determined to be defective in step S14.
[0030]
By performing such determination for each measurement point as shown in steps S16 to S19, it is possible to determine whether or not the signature 100 is defective.
[0031]
Then, it is determined whether or not the signature 100 is defective. When it is determined that the signature 100 is defective, a predetermined control signal is transmitted to the alarm means 30 via the signal output unit 24, the alarm means 30 is operated, and an alarm is issued.
[0032]
In addition, it may be configured such that whether the quality is good or bad is displayed on a display unit (not shown), an alarm is output (buzzer, lamp, etc.) when a defect is detected, and an external output is possible.
[0033]
For example, when the variation of the thickness distribution in the same signature 100 exceeds a predetermined value, a predetermined control signal is output to the paper discharge device (not shown) via the signal output unit 24, and the generated defective product is detected. It can also be configured to automatically extract. In addition, the removal of defective products may be performed offline.
[0034]
Further, the load cell 13 measured the load cell 13 instead of converting the magnitude of the force measured by the load cell 13 into the thickness of the signature 100 and determining whether or not the signature 100 is defective based on the magnitude of variation in the thickness distribution. It is also possible to determine whether or not the signature 100 is defective by analyzing fluctuations in the magnitude of the force itself.
[0035]
In addition, the load cell 13 for measuring the thickness of the signature 100 can monitor only a portion where defects are likely to occur, and a predetermined portion on the folding start side of the signature 100 that is chopper folded by the chopper blade 50, for example, Provided only at a predetermined portion of the measuring roller 12 so that the thickness of a portion having a width of 20 mm from the folding start end and a predetermined portion on the opposite end side, for example, a portion having a width of 20 mm from the end portion can also be measured. Alternatively, only the load cell 13 disposed in the portion can be configured to measure the thickness of the signature 100, and the configuration of the sheet monitoring method or the sheet monitoring apparatus 1 can be simplified.
[0036]
Further, the thickness of the signature 100 crushed by the crushing roller 11 may be measured by an appropriate means other than the load cell 13.
[0037]
【The invention's effect】
According to the present invention for measuring and evaluating the thickness, it is possible to detect defects such as corner breaks and tears that occur inside a signature, etc., and to detect the occurrence of defective products with high accuracy. There is an effect that can be done.
[0038]
Therefore, when the above-mentioned defect occurs in the signature being inspected, this can be detected promptly and adjustment of the folding operation timing, removal of defective products, etc. can be performed quickly and reliably. There is an effect that defective products can be prevented from flowing.
[Brief description of the drawings]
FIG. 1 is a block diagram of a sheet monitoring apparatus according to the present invention.
FIG. 2 is an explanatory diagram showing an example of measuring means of the sheet monitoring apparatus of the present invention.
FIG. 3 is a flowchart for determining the presence or absence of a defect according to the present invention.
FIG. 4 is a flowchart for determining the presence or absence of a defect according to the present invention.
5A and 5B are explanatory diagrams of the thickness distribution of a signature measured by the sheet monitoring apparatus of the present invention, where FIG. 5A is an example of a normal signature, and FIG. 5B is a signature with a corner fold. For example, (C) is an example in the case of a signature with a piece.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheet monitoring apparatus 10 Measuring means 11 Crushing roller 12 Measuring roller 13 Load cell 20 Data analysis determination means 21 Signal input part 22 Storage part 23 Calculation processing part 24 Signal output part 30 Alarm means 50 Chopper blade 100 Signature 100A Normal signature 100B Corner-folded signature 100C Striped signature AX Thickness distribution (horizontal direction)
AY thickness distribution (vertical direction)
BX thickness distribution (horizontal direction)
BY thickness distribution (vertical direction)
CX thickness distribution (horizontal direction)
CY thickness distribution (vertical direction)

Claims (3)

軸方向と周方向に所定の間隔で複数の厚み計測手段を備えた計測ローラと潰しローラとの間にシートを通過させて1シート内の厚み分布を計測し、その計測した厚み分布を解析し、厚み分布の変動の大きさからシートの千切れなどの局部的不在、角折れなどの局部的重複を検出することを特徴とするシート監視方法。 A sheet is passed between a crushing roller and a measuring roller having a plurality of thickness measuring means at predetermined intervals in the axial direction and the circumferential direction, and the thickness distribution in one sheet is measured, and the measured thickness distribution is analyzed. A sheet monitoring method for detecting a local absence such as a piece of a sheet, a local overlap such as a corner fold, etc., from the magnitude of variation in thickness distribution. 軸方向と周方向に所定の間隔で複数の厚み計測手段を備えた計測ローラと潰しローラとからなる一対のローラと、厚み計測手段が検出した厚みデータを解析するデータ解析手段と、データ解析手段が1シート内の厚み分布に所定値を超える変動を検出したときに所要の情報を出力する情報出力手段とを備えたことを特徴とするシート監視装置。 A pair of rollers comprising a measuring roller and a crushing roller having a plurality of thickness measuring means at predetermined intervals in the axial direction and the circumferential direction, a data analyzing means for analyzing the thickness data detected by the thickness measuring means, and a data analyzing means A sheet monitoring apparatus comprising: information output means for outputting required information when a fluctuation exceeding a predetermined value is detected in the thickness distribution in one sheet. 請求項2記載のシート監視装置を備えたことを特徴とする折り機。  A folding machine comprising the sheet monitoring device according to claim 2.
JP2001389878A 2001-12-21 2001-12-21 Sheet monitoring method, apparatus therefor, and folding machine using the same Expired - Fee Related JP3941919B2 (en)

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JP3941919B2 true JP3941919B2 (en) 2007-07-11

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JP6119269B2 (en) * 2013-01-25 2017-04-26 大日本印刷株式会社 Foreign matter inspection equipment

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