JP4527433B2 - Method and apparatus for removing residual magnetism in forms - Google Patents

Description

  The present invention relates to a method and apparatus for removing residual magnetism of a form.

Conventionally, as a non-destructive inspection method for checking whether or not multiple forms are sealed without error in postal seals processed with an automatic sealing and sealing machine, a specific pattern is formed on each form in advance with a magnetic material. There is a method of detecting a specific pattern (hereinafter referred to as an image forming pattern) after enclosing (for example, see Patent Document 1).
Japanese Patent No. 2686229

  However, in the above-described method, it may be difficult to detect the image formation pattern due to the presence of the magnetic substance attached to the surface of the form before the specific pattern is formed.

  In other words, a slight amount of magnetic material may remain on the surface of a form printed by a laser printer or the like due to the printing ink (toner) itself or a secondary element of the printing process. Although the amount of magnetism due to the residual magnetic material per sheet is small, in reality, multiple sheets may be folded and sealed in the envelope, so the residual magnetic material of each form overlaps, The total amount may not be ignored during detection.

  Therefore, in view of the above-described conventional problems, the present invention reduces the influence of residual magnetism on a form, and can improve the reliability of detection of an image formation pattern of a form in an envelope. And to provide an apparatus.

The invention according to claim 1 has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined location, and a magnetic material other than the image forming pattern is attached, and the image forming pattern is formed. as the magnetic material contained ink or toner used in the image, in the form of a magnetic body is used having a higher coercive force than the coercive force of the magnetic material other than the imaging pattern, the imaging pattern A method of removing residual magnetism of a magnetic material other than the above, wherein the form is passed through a first magnetic field having a constant magnetization direction equal to or higher than a saturation magnetic flux density in a magnetization curve of the imaging pattern, then, to zero attenuated gradually from the strong to the extent that does not affect the magnetism of the imaging pattern subtracting only the remanence an intensity corresponding to the saturation magnetic flux density in the magnetization curve of the remanence And wherein the passing through the alternating magnetic field urchin variable.

The invention described in claim 2 has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined location, and a magnetic material other than the image forming pattern is attached, and the image forming pattern is formed. as the magnetic material contained ink or toner used in the image, in the form of a magnetic body is used having a higher coercive force than the coercive force of the magnetic material other than the imaging pattern, the imaging pattern A method of removing residual magnetism of a magnetic material other than the above, wherein the form is passed through a first magnetic field having a constant magnetization direction equal to or higher than a saturation magnetic flux density in a magnetization curve of the imaging pattern, then, in the first magnetic field opposite to the magnetization direction, the saturation magnetic flux density in the magnetization curve of the residual magnetism in the opposite direction of magnetization approximately twice or more the strength of the coercive force in the magnetization curve of the remanence And wherein the passing the corresponding intensity to a second in a magnetic field in a range of intensity that does not affect the magnetism of the imaging pattern.

The invention described in claim 3 has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined place, and a magnetic material other than the image forming pattern is attached, and the image forming pattern is formed. as the magnetic material contained ink or toner used in the image, in the form of a magnetic body is used having a higher coercive force than the coercive force of the magnetic material other than the imaging pattern, the imaging pattern A device for removing the residual magnetism of a magnetic material other than the first magnetic field, generating a first magnetic field having a constant magnetization direction greater than or equal to a saturation magnetic flux density in the magnetization curve of the imaging pattern, A magnetizing device that allows the form to pass through, and a strength corresponding to a saturation magnetic flux density in the magnetization curve of the residual magnetism, and a strength that does not affect the magnetism of the imaging pattern by reducing only the residual magnetism From And second attenuating generates an alternating magnetic field that is variable to be zero, in the alternating magnetic field in, characterized by comprising a demagnetization device for passing the form that has passed through the magnetizing device.

The invention described in claim 4 has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined place, and a magnetic material other than the image forming pattern is attached, and the image forming pattern is formed. as the magnetic material contained ink or toner used in the image, in the form of a magnetic body is used having a higher coercive force than the coercive force of the magnetic material other than the imaging pattern, the imaging pattern A device for removing the residual magnetism of a magnetic material other than the first magnetic field, generating a first magnetic field having a constant magnetization direction greater than or equal to a saturation magnetic flux density in the magnetization curve of the imaging pattern, a magnetization unit for passing the form in the middle, the first magnetic field opposite to the magnetization direction, the remanence in the opposite magnetization direction approximately twice stronger than the coercive force of the magnetization curve of the remanence Magnetization of Characterized by comprising the demagnetization device for passing saturation magnetic flux density in the second magnetic field strength that does not affect the magnetism of the imaging pattern in the range of up to strength corresponding at line.

  According to the first and third aspects of the present invention, since the remanent magnetism 11 is demagnetized to almost zero, it becomes easy to identify the image formation pattern, and the magnetism of the image formation pattern is detected to influence the influence of the remanence. A small number of highly reliable detection signals can be extracted.

  According to the second and fourth aspects of the present invention, the image forming pattern is magnetized in the constant magnetization direction, and the residual magnetism is demagnetized to zero or slightly magnetized in the opposite magnetization direction. Therefore, it is possible to detect the magnetism of the image forming pattern and extract a highly reliable detection signal with little influence of residual magnetism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an encapsulating and sealing system including a residual magnetic removal apparatus for performing a residual magnetic removal method for a form according to an embodiment of the present invention.

  1 includes a control device 1, a printing device 2, an automatic sealing and sealing machine 3, a magnetizing device 4, a demagnetizing device 5, and an image forming pattern detecting device 6.

  Each of the printed forms 10a, 10b, 10c,. . . A continuous business form 10 is supplied to the printing apparatus 2. Printed forms 10a, 10b, 10c,. . . In the case where the explanatory text or the like is printed with ink or toner containing a magnetic material, the residual magnetism 11 may occur in the explanatory text or the like.

  Under the control of the control device 1, the printing device 2 prints the printed forms 10a, 10b, 10c,. . . Printing a specific pattern (for example, a rectangle) for detecting a form by using ink or toner containing a magnetic material at different locations in the empty space where no explanation is printed, thereby forming image forming patterns 12a, 12b, 12c,. . . Form. Image forming patterns 12a, 12b, 12c,. . . As the magnetic material used in the above, a material having a higher coercive force than the magnetic material of the remanent magnet 11 is used.

  The continuous form 10 on which the specific pattern is printed is supplied to the automatic enclosing and sealing machine 3. The automatic enclosing and sealing machine 3 cuts off the supplied continuous form 10 and prints each printed form 10a, 10b, 10c,. . . Isolate. Each separated printed form 10a, 10b, 10c,. . . Are encapsulated in an envelope 13, and finally the envelope 13 is sealed.

  The envelope 13 sealed by the automatic sealing machine 3 is supplied to the magnetizing device 4. The magnetizing device 4 includes printed forms 10a, 10b, 10c,. . . Is sufficiently magnetized (that is, up to the saturation region) (assuming that the magnetization direction at this time is +). In this state, the remanent magnetism 11 portion such as the explanatory text and the image forming patterns 12a, 12b, 12c,. . . All the magnetism including the part is magnetized in the same direction (+).

FIG. 2 is a diagram showing a magnetization curve of a remanent magnetic part and an image forming pattern. Both the remanence magnetization curve a and the image formation pattern magnetization curve b are accompanied by a hysteresis phenomenon. Coercive force Hb of the imaging pattern is higher than the coercive force Ha of residual magnetic portion. As shown in FIG. 2, the magnetizing device 4 generates a magnetic field having a constant magnetization direction (for example, + direction) corresponding to the maximum value (saturation magnetic flux density) in the magnetization curve b of the imaging pattern (+ Hs) or larger. To do. By passing the envelope 13 in this magnetic field, the residual magnetism 11 portion and the image forming patterns 12a, 12b, 12c,. . . Both are magnetized to the saturation region. Thereby, the forms 10a, 10b, 10c,. . . , The residual magnetic flux density Ba shown in FIG. 2 remains in the residual magnetism 11 portion, and the image forming patterns 12a, 12b, 12c,. . . In addition, the residual magnetic flux density Bb shown in FIG. 2 remains.

  The envelope 13 that has passed through the magnetizing device 4 is supplied to the demagnetizing device 5. In the demagnetizing device 5, the forms 10a, 10b, 10c,. . . Only the residual magnetism 11 is demagnetized. Specifically, only the remanence is demagnetized to approximately zero or slightly magnetized in the opposite direction (eg, the-direction), but there are two methods.

  In the first method, the demagnetizer 5 reduces only the residual magnetism 11 and forms the image forming patterns 12a, 12b, 12c,. . . An alternating magnetic field that starts from a strength that does not affect the magnetism of the magnetic field and gradually attenuates is generated. By passing the envelope 13 through the alternating magnetic field, the residual magnetism 11 is made as close to zero as possible. The strength at the start of the alternating magnetic field is indicated by a dotted line in FIG. That is, at the start, the strength of the alternating magnetic field is set to a value (± Ht) corresponding to the maximum value (saturation magnetic flux density) in the magnetization curve a of residual magnetism (± Ht) or larger, and gradually attenuates to zero. Variable.

  When the envelope 13 passes through such an alternating magnetic field, the forms 10a, 10b, 10c,. . . Of the image forming patterns 12a, 12b, 12c,. . . The magnetic field of the magnetic field falls below the residual magnetic flux density Bb, but hardly decreases.

  Next, in the second method, the demagnetizing device 5 includes the image forming patterns 12a, 12b, 12c,. . . By generating a magnetic field in a direction (−) opposite to the magnetization direction magnetized by the magnetizing device 4 with a strength that does not affect the magnetic field of the magnetic field 4 and passing the envelope 13 through the magnetic field, the residual magnetism 11 is reduced to zero. Or slightly magnetized in the opposite direction (-). The strength of the magnetic field in the opposite direction (-) in this case is indicated by a one-dot chain line in FIG. That is, the strength of the magnetic field in the opposite direction (-) is, for example, a value (-Hc) corresponding to almost twice the coercive force (-Ha) in the remanence magnetization curve a, or this value (-Hc). And a value (−Ht) corresponding to the saturation magnetic flux density.

  When the envelope 13 passes through the magnetic field in the opposite direction (−), the forms 10a, 10b, 10c,. . . Is slightly magnetized so that the remanence 11 of the magnetic field becomes almost zero or the magnetic flux density in the opposite direction (-), and the image forming patterns 12a, 12b, 12c,. . . The magnetic field of the magnetic field falls below the residual magnetic flux density Bb, but hardly decreases.

  In this way, the forms 10a, 10b, 10c,. . . Is supplied to the image forming pattern detection device 6. In the image forming pattern detection device 6, under the control of the control device 1, each of the forms 10 a, 10 b, 10 c,. . . Image forming patterns 12a, 12b, 12c,. . . , And the forms 10a, 10b, 10c,. . . Is confirmed without error.

  During this detection, the image forming patterns 12a, 12b, 12c,. . . Is magnetized in the (+) direction and the remanent magnetism 11 is magnetized in the zero or (−) direction, so that it becomes easy to identify, and the image forming patterns 12a, 12b, 12c,. . . Thus, a highly reliable detection signal with little influence of the residual magnetism 11 can be extracted.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to this, and various modifications and applications are possible.

  For example, when the above-described second method is employed in the demagnetization device 5, the image forming pattern detection device 6 uses a magnetic sensor that can also detect the magnetization direction (+). Detection accuracy can be increased.

  In the above-described embodiment, the image forming patterns 12a, 12b, 12c,. . . Are printed forms 10a, 10b, 10c,. . . However, instead of this, an image forming pattern may be formed at the same location for all forms to be enclosed in the same envelope. . In this case, a form in which an image forming pattern is formed at a different location can be detected as an erroneous inclusion from a plurality of forms enclosed in the same envelope.

It is a schematic block diagram which shows the enclosure sealing system containing the residual magnetism removal apparatus which implements the residual magnetism removal method of the form which concerns on embodiment of this invention. It is a figure which shows the magnetization curve of a residual magnetic part and an image formation pattern.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Printing apparatus 3 Automatic enclosure sealing machine 4 Magnetizing apparatus 5 Demagnetizing apparatus 6 Image formation pattern detection apparatus 10 Continuous form 10a, 10b, 10c Printed form 11 Residual magnetism 12a, 12b, 12c Image formation pattern 13 Envelope

Claims (4)

Ink or toner that has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined location, and a magnetic material other than the image forming pattern is attached, and is used for image forming of the image forming pattern in a magnetic material contained in the form of magnetic material having a high coercive force than the coercive force of the magnetic material other than the image forming pattern is used, the residual magnetism of the magnetic member other than the image forming pattern A method of removing,
The form is passed through a first magnetic field having a constant magnetization direction equal to or greater than the strength corresponding to the saturation magnetic flux density in the magnetization curve of the imaging pattern, and then corresponds to the saturation magnetic flux density in the magnetization curve of the residual magnetism. Passing through an alternating magnetic field that is reduced in strength from the strength that reduces only the residual magnetism and does not affect the magnetism of the imaging pattern. A method for removing residual magnetism from forms. Ink or toner that has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined location, and a magnetic material other than the image forming pattern is attached, and is used for image forming of the image forming pattern in a magnetic material contained in the form of magnetic material having a high coercive force than the coercive force of the magnetic material other than the image forming pattern is used, the residual magnetism of the magnetic member other than the image forming pattern A method of removing,
The form is passed through a first magnetic field having a constant magnetization direction equal to or greater than a saturation magnetic flux density corresponding to a saturation magnetic flux density in the magnetization curve of the imaging pattern, and then in a magnetization direction opposite to the first magnetic field , The magnetism of the imaging pattern is in a range from a strength of approximately two times or more of the coercive force in the remanent magnetization curve to a strength corresponding to the saturation magnetic flux density in the remanent magnetization curve in the opposite magnetization direction. A method for removing residual magnetism in a form, characterized by allowing the magnetic field to pass through a second magnetic field having a strength that does not affect the magnetic field. Ink or toner that has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined location, and a magnetic material other than the image forming pattern is attached, and is used for image forming of the image forming pattern in a magnetic material contained in the form of magnetic material having a high coercive force than the coercive force of the magnetic material other than the image forming pattern is used, the residual magnetism of the magnetic member other than the image forming pattern A device for removing,
A magnetizing device that generates a first magnetic field having a constant magnetization direction equal to or higher than a saturation magnetic flux density in a magnetization curve of the imaging pattern and passes the form in the first magnetic field;
Variable from the strength corresponding to the saturation magnetic flux density in the magnetization curve of the residual magnetism, which decreases only the residual magnetism and does not affect the magnetism of the imaging pattern, so that it gradually attenuates to zero. And a demagnetizing device for passing the form that has passed through the magnetizing device in the alternating magnetic field. Ink or toner that has an image forming pattern formed with an ink or toner containing a magnetic material at a predetermined location, and a magnetic material other than the image forming pattern is attached, and is used for image forming of the image forming pattern in a magnetic material contained in the form of magnetic material having a high coercive force than the coercive force of the magnetic material other than the image forming pattern is used, the residual magnetism of the magnetic member other than the image forming pattern A device for removing,
A magnetizing device that generates a first magnetic field having a constant magnetization direction equal to or higher than a saturation magnetic flux density in a magnetization curve of the imaging pattern and passes the form in the first magnetic field;
In the first magnetic field opposite to the magnetization direction, the intensity corresponding to the saturation magnetic flux density in the magnetization curve of the residual magnetism in the opposite direction of magnetization approximately twice or more the strength of the coercive force in the magnetization curve of the remanence And a demagnetizing device that passes through the second magnetic field having a strength that does not affect the magnetism of the image forming pattern .

Images