JP2010149940A - Paper lost state detecting device in ovd sticking machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting a paper lost state in an OVD (optically variable device) sticking machine for carrying paper by a stream feeder system. <P>SOLUTION: This OVD sticking machine carries at least two or more of paper sheets carried by the stream feeder system to an OVD sticking unit in a continuously overlapped state on a carrier table. The lost state detecting device of the OVD sticking machine includes at least a detecting means for detecting a lost state of a lateral front end part and a lateral rear end part of the paper sheets when carrying the paper sheet, in the vicinity of both right-left end parts of paper to the paper flowing direction of the carrier table and in a position being substantially vertical to the paper sheets carried in the continuously overlapped state, a determining means for comparing and determining the paper lost state detected by the detecting means with a predetermined threshold value, and a control means for controlling the OVD sticking machine by a result provided by the determining means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

In the OVD pasting machine for pasting a label such as Optically Variabe Device (hereinafter referred to as “OVD”) to a valuable printed matter such as a bank note, the present invention is able to detect a missing state of a sheet conveyed by a stream feeder method. The present invention relates to a detection device.

  OVD is a foil in which a metal is deposited on a relief-like diffraction grating, and has a unique optical change function such as the appearance of a stereoscopic image and color shift. In recent years, such as banknotes, cash vouchers and gift certificates It has been applied to a substrate for the purpose of enhancing the effect of preventing forgery against precious printed matter.

  The OVD pasting machine that applies these OVDs to paper is a machine that applies OVD foil or OVD sheet to paper by transfer or pressure bonding to paper that has been printed with patterns or characters, etc. As a method of pressure bonding, in general, an OVD sheet or film is placed between a heated metal stamp and the paper, and the OVD sheet is pressed against the paper with the stamp, or instead of the heated stamp. In addition, there is a method that performs a roll transfer method using a heated roll.

  OVD is an element that guarantees that the valuable printed material is genuine, so it must be surely attached to the valuable printed material. However, as a general OVD pasting machine, the printing paper is conveyed by a stream feeder method, Since OVD is affixed to each sheet of paper, when the OVD is transferred or pressure-bonded to the printing sheet, defects such as flickering or corner breakage occur on the sheet being transported, so the OVD is not accurately given to the substrate. Things can occur.

In addition, since the sheets conveyed by the stream feeder method are passed through with overlapping sheets, it is not easy to determine when there is a defect in the sheets. In particular, the corner breakage that causes the sheet corner to be folded cannot be found by visual inspection because it is a sheet overlap. If this corner breakage cannot be detected with certainty, the impression cylinder and the plate surface may be crushed. Therefore, it is necessary to detect them reliably and to prevent the OVD from being transferred or conveyed to a processing section that performs pressure bonding.

  As an apparatus for inspecting the missing state of the paper being transported, a detection unit for inspecting the missing state of the paper is provided in the feeder part of a general offset printing machine, and a detection mark is printed in advance on the margin of the paper, An apparatus that detects a missing state of a sheet by detecting the presence or absence of a detection mark by an inspection apparatus having a determination unit that determines whether or not a sheet is folded has already been disclosed (for example, see Patent Document 1).

  In addition, there is already a sheet supply control method that detects the occurrence of loss of paper by detecting the loss of printing paper that is transported in two layers, and stopping the supply of printing ink when a defect such as double stacking is detected. Published (see, for example, Patent Document 2).

JP 7-112851 A JP-A-8-244212

  However, since the invention of Patent Document 1 prints a detection mark on the margin of the printing paper and measures the reflectance of the detection unit with an optical sensor, it makes an erroneous determination when the print density is light or dark. There is a possibility. In addition, banknotes and the like with many printing colors have a problem that it is difficult to secure a space for printing a detection mark because a print headline such as a color patch is provided in the margin.

  Further, since the invention of Patent Document 2 is intended to detect that two sheets of paper before printing are conveyed in a stack, it is not intended for detection in a stream feeder system in which a part of the sheets are conveyed in an overlapping manner. . Therefore, unlike the OVD sticking machine, it is not conscious of the printed matter after all the printing has been performed, so the influence at the time of the occurrence of waste paper is different, and in order to adopt it for the stream feeder type OVD sticking machine, Not a few issues remained.

In the present invention, a non-contact sensor or a contact-type sensor that detects a paper missing state is provided in the feeder portion of the OVD sticking machine, thereby detecting an overlapped portion of the partially overlapped paper in accordance with the conveyance timing, and stored in advance. By comparing with the normal threshold value, the missing state of the paper can be accurately determined, and the OVD can be reliably attached to the printed product.

  In the OVD pasting machine according to the present invention, the paper missing state detecting device is transported to the OVD pasting unit in a state where at least two sheets of paper transported by the stream feeder method are continuously overlapped on the transport table. In the OVD pasting machine, the sheet is placed in the vicinity of the left and right ends of the sheet with respect to the sheet flow direction of the conveyance table, and at a position substantially perpendicular to the sheets conveyed in a continuously overlapping state. Detection means for detecting the paper missing state at the left and right front end (barking portion) and right and left rear end (barking tail) of the paper during conveyance of the sheet, and the paper loss state detected by the detection means A determination means for comparing with a predetermined threshold, a conveyance stop means for stopping the conveyance of the sheet based on the defect information obtained by the determination means, and an OVD pasting machine according to the result obtained by the determination means. Control It is characterized by a control means which is deficient state detecting device at least comprising the OVD paster.

  Further, the detection means described above is a defect state detection device for an OVD sticking machine that is at least one detection member selected from an optical sensor, an ultrasonic sensor, and a contact sensor.

  Further, the missing state detection device in the OVD sticking machine of the present invention emits a display means and / or an alarm sound for making the missing state known when the above-mentioned judging means judges that the sheet is missing. It is a missing state detection device for an OVD sticking machine provided with an alarm means.

The paper loss state detection apparatus in the OVD pasting machine of the present invention detects a loss state even at a certain position on the feeder board even if the paper is in a state of being conveyed while being partially overlapped by the stream feeder method. Thus, it is possible to achieve stable quality control that can be reliably performed and generation of defective products can be suppressed.

  In addition, since the paper loss state detection device in the OVD sticking machine of the present invention detects the paper conveyance timing and the paper overlap state together, it can accurately detect the loss state without printing a detection mark on the margin. Therefore, the cost is abolished and the cost can be reduced as compared with the prior art.

  Furthermore, the paper loss state detection device in the OVD sticking machine of the present invention can greatly reduce the reprinting of paper loss that has occurred up to now and machine stoppage due to a mistake in operating the detector. The work load can be reduced.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and includes various other embodiments within the scope of the technical idea in the scope of the claims.

A sheet loss state detection apparatus in an OVD sticking machine of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a paper loss state detection device of the present invention, FIG. 2 is a flowchart showing detection steps in the paper loss state detection device of the present invention, and FIG. 3 is a laser sensor as a detection means. FIG. 4 shows an example of a schematic diagram of a defect state detection apparatus in an OVD sticking machine using an ultrasonic sensor as a detection means, and FIG. FIG. 6 is a schematic diagram showing a light transmission amount of a sheet detected by a laser-type light receiving sensor, FIG. The figure of an example of the detection state of the paper in the defect | deletion state detection apparatus of the OVD sticking machine of this invention is each shown.

First, the configuration of the paper loss state detection apparatus in the OVD pasting machine of the present invention will be described with reference to FIG. The configuration of the apparatus of the present invention comprises a supply means (M1), a transport means (M2), a detection means (M3), a determination means, (M4), a control means (M5), and a processing means (M8). As well-known means at the time, an alarm means (M6) and a display means (M7) are provided.

  The supply means (M1) is a stream feeder system that continuously supplies stacked sheets without any gap. The transport means (M2) is a means for transporting the sheet fed from the supply means (M1) to the processing section (M8) such as a pasting unit, and from the supply means (M1) to the processing section ( Rather than being supplied directly to M8), it is a means for inspection of the state of the sheet through the conveying means (M2). Usually, it is composed of a transport table for transporting a sheet and a driving means for transporting the sheet on the table to the processing section (M8). The distance of the transport table, the speed of the driving means, and the like differ appropriately depending on the size of the apparatus including the processing unit (M8) and the type of medium to be processed.

  The detection means (M3) is a means for measuring the defective state of the sheet transported on the transport table in the transport means (M2). Sheet defects are frequently generated at the left and right ends, so they are installed on the left and right sides of the transport table so that the vicinity of the left and right ends of the transported paper can be measured. As for the sensor used for the detection means (M3), since the sheets fed from the stream feeder type supply means (M1) are continuously overlapped on the transport table, light is transmitted. Either an optical sensor (FIG. 3), an ultrasonic sensor that transmits sound waves (FIG. 4), or a contact-type sensor (FIG. 5) that detects the thickness and the like even in an overlapping state is used.

  The judging means (M4) feeds and transports normal sheets in advance as a test, aggregates the measurement data, and uses the threshold value obtained from the data to actually detect it by the detecting means (M3). This is a comparative determination of the sheets.

  The control means (M5) compares the sheet data measured by the detection means (M3) with the threshold value set in advance by the determination means (M4), and the sheet that deviates from the threshold setting is judged to have a defect. The supply means (M1) and the conveyance means (M2) are stopped, and the conveyance of the defective sheet to the processing section (M8) is prevented. As for the means for notifying the missing paper, there is an alarm means (M6) for the purpose of notifying the operator by voice and a display means for the purpose of notifying by means of image or text information. Some can be used properly.

  Next, a process of detecting a paper missing state will be described using the flowchart of FIG. First, the transport paper is supplied to the transport section by the paper supply means (S1), the supplied transport paper is transported by the transport means (S2), the transported paper is detected by the defect detection means (S3), and the determination is made. When it is determined that there is no defect by the means (S4), normal processing (S5), and when it is determined that there is a defect (S6), the control means stops the paper supply means and the conveyance means (S9). ) And a means for notifying the operator that the defect has occurred by displaying the occurrence of the defect (S7) or issuing an alarm (S8). With regard to the well-known means, it can be selected depending on the case whether it is performed simultaneously or properly.

At least two sheets stacked in a feeder unit serving as a paper supply means are supplied in a state of being overlapped by the stream feeder method, and the vicinity of both left and right ends of the sheet conveyed by a conveyance belt as a conveyance means is provided. At least two light emitting / receiving sensors as measurement means are installed at a position where paper loss measurement is possible, and the transmitted light amount received by the light receiving unit is transmitted to the control unit, which is set in advance as a determination criterion If the threshold value exceeds the set value, it is determined that there is a missing sheet, and the feeder and drive device as the supply unit are stopped to stop the conveyance belt as the conveyance unit. Detection is performed, and conveyance of the defective sheet to the processing unit is prevented.

When the measured amount of transmitted light falls below the threshold setting value, it is determined that there are no defects at the left and right ends of the conveyed sheet, the sheet is conveyed to the processing unit, OVD is pasted, and loaded at the discharge unit. The

The missing state detection apparatus according to the present invention includes a transport unit 1 that transports a sheet by a stream feeder method, an irradiation unit 2 that irradiates laser light 5, a receiving unit 3 that receives transmitted light 7 that has passed through the sheet, and a receiving unit. The obtained signal is constituted by the judging means 4 for comparing and judging with a predetermined threshold value, and the transported paper 6 to be transported is to be inspected.

FIG. 3 is a schematic side view showing the configuration of the defect state detection apparatus of the present invention. As shown in FIG. 3, the transport paper 6 is transported by the transport means 1 in a state of being overlapped by the stream feeder method, irradiated with the laser beam 5 by the irradiating means 2, and the transmitted light 7 passing through the transport paper 6 is received by the receiving means 3. The signal received and obtained is compared with a threshold value set in advance by the discriminating means 4. The installation positions of the irradiating means 2 and the receiving means 3 may be adjusted as appropriate according to the overlapping position of the conveyance sheets.

Next, a method for detecting a missing state of a sheet when a laser type light projecting / receiving sensor is used will be described with reference to FIG. FIG. 6 is a schematic diagram showing the relationship between the laser irradiation position for detecting the loss of the transport paper and the amount of transmitted light.

The transport paper 6 moves in the paper flow direction, and the transport paper tailing left and right overlapping portion B (FIG. 6B) and the transport paper tailing left and right overlapping portion C (FIG. 6C) are irradiated with laser. The amount of transmitted light when passing through the section is measured and compared with a threshold value for determination.

For example, when there is no defect in the transport sheet, the waveform is repeated as shown in FIG. 6 (e), but when there is a defect in the left and right overlapping portion B of the transport sheet, the amount of laser transmitted light at the time of detection is Since the amount of transmitted light is the same as that at measurement location A (FIG. 6 (a)) or measurement location D (FIG. 6 (d)), the waveform is as shown in FIG. 6 (f). If there is a defect in the left and right overlapping portion C of the bottom edge, the waveform shown in FIG. Usually, the presence or absence of a defect is inspected by repeating (a), (b), (c), and (d) in FIG.

(E), (f), and (g) in FIG. 6 show the relationship between the received transmitted light amount and the detection position. For example, the amount of transmitted light received is generally smaller at the three overlapping positions (FIGS. 6B and 6C) than the overlapping position (FIGS. 6A and 6D) where two or less transport sheets are present.

A threshold is set as a criterion for detecting paper loss. The threshold value can be set to an arbitrary value, but in FIG. 6, an intermediate value of the difference in transmitted light amount between the three sheets of transported paper and the two sheets is set.

The presence / absence detection of the paper missing state in the paper missing state detecting device of the OVD pasting machine of the present invention will be described with reference to FIG. FIG. 7A shows a state in which there is no defect in the paper, and FIG. 7B shows a state in which there is a defect in the paper. When the laser beam 5 irradiated by the irradiation unit 2 scans the transport paper 6, the laser beam 7 reflected by the receiving unit 3 is received. The reflected light amount of the laser beam 7 received by the receiving means is compared with a preset threshold value. If the reflected light amount falls below the threshold value, it is determined that there is no defect (FIG. 7C). It is determined that there is a defect (FIG. 7 (d)).

By determining the timing of the overlap position of the conveyance sheets, that is, the defect detection position in the determination unit 4 in advance, detection can be performed regardless of the size and shape of the defect. About the numerical value of transmitted light quantity, it is desirable to install so that a sensitivity may become the maximum with the attachment angle of an irradiation part and a receiving part.

  In this embodiment mode, an embodiment using an optical sensor has been described. However, as shown in FIG. 4 or FIG. 5, an ultrasonic sensor or a contact sensor can be used. Of course, a case where a CCD camera is used instead of various sensors can be easily assumed. In this case, the comparison with the threshold value is performed by pattern matching.

The block diagram which shows the structure of the paper missing state detection apparatus of this invention The flowchart figure which shows the detection process in the paper missing state detection apparatus of this invention. The figure which shows an example of the paper missing state detection apparatus which used the laser sensor for the detection means The figure which shows an example of the paper missing state detection apparatus which used the ultrasonic sensor for the detection means The figure which shows an example of the paper missing state detection apparatus which used the contact-type sensor for the detection means Schematic diagram showing the amount of light transmitted through the paper detected by the laser-type light receiving sensor The figure which shows an example of the detection state of the paper in the paper missing state detection apparatus of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveying means 2 Irradiating means 3 Receiving means 4 Judging means 5 Laser light 6 Conveying paper 7 Transmitted light 8 Folded part 9 Feeder board 10 Detection means M1 Supply means M2 Conveying means M3 Detection means M4 Determination means M5 Control means M6 Alarm means M7 Display means M8 Processing means

Claims (4)

In the OVD pasting machine transported by the stream feeder method and transported to the OVD pasting unit in a state where at least two sheets are continuously overlapped on the transport table,
The left and right sides of the sheet are positioned in the vicinity of both left and right ends of the sheet with respect to the sheet flow direction of the conveyance table, and at a position that is substantially perpendicular to the sheets conveyed in a continuously overlapping state. Detecting means for detecting a paper missing state of the front end portion (the gripping portion) and the left and right rear end portions (the tail edge portion) during conveyance of the sheet;
A determination unit that compares and determines a paper loss state measured by the detection unit with a predetermined threshold;
An apparatus for detecting a defect state of an OVD pasting machine, comprising at least control means for controlling the OVD pasting machine based on a result obtained by the judging means. The defect detection apparatus for an OVD sticking machine according to claim 1, wherein the detection means is at least one detection member selected from an optical sensor, an ultrasonic sensor, and a contact sensor. 3. The defect detection device for an OVD sticking machine according to claim 1, further comprising a conveyance stop unit that stops conveyance of the sheet based on the defect information obtained by the determination unit. The missing state detection device includes a display unit and / or an alarm unit that emits an alarm sound when the determination unit determines that the sheet is missing. The defect state detection device for an OVD sticking machine according to any one of claims 1 to 3.

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