EP1197808A2 - Méthode et machine d'impression pour l'application de toner sur un substrat et dispostif de mesure pour une machine d'impression - Google Patents

Méthode et machine d'impression pour l'application de toner sur un substrat et dispostif de mesure pour une machine d'impression Download PDF

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Publication number
EP1197808A2
EP1197808A2 EP01123542A EP01123542A EP1197808A2 EP 1197808 A2 EP1197808 A2 EP 1197808A2 EP 01123542 A EP01123542 A EP 01123542A EP 01123542 A EP01123542 A EP 01123542A EP 1197808 A2 EP1197808 A2 EP 1197808A2
Authority
EP
European Patent Office
Prior art keywords
toner
sensor
printing
printing machine
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01123542A
Other languages
German (de)
English (en)
Inventor
Wolfgang Luxem
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NexPress Solutions LLC
Original Assignee
NexPress Solutions LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NexPress Solutions LLC filed Critical NexPress Solutions LLC
Publication of EP1197808A2 publication Critical patent/EP1197808A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5062—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the characteristics of an image on the copy material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5054—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the characteristics of an intermediate image carrying member or the characteristics of an image on an intermediate image carrying member, e.g. intermediate transfer belt or drum, conveyor belt
    • G03G15/5058—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the characteristics of an intermediate image carrying member or the characteristics of an image on an intermediate image carrying member, e.g. intermediate transfer belt or drum, conveyor belt using a test patch
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00059—Image density detection on intermediate image carrying member, e.g. transfer belt
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00063—Colour
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00067—Image density detection on recording medium

Definitions

  • the invention relates to a method for applying printing from toner on a printable surface, according to claim 1, a printing machine for application printing from toner onto a printable surface, according to Preamble of claim 7 and a measuring device for a printing press to determine the amount of toner applied to a printable area, according to claim 18.
  • the toner In known printing presses, the toner is in the unfixed state when this is still, for example, on an image carrier, such as an image cylinder the toner density is measured and with the help of this value the printing process controlled.
  • an image carrier such as an image cylinder
  • the toner density is measured and with the help of this value the printing process controlled.
  • the relationship between the measured toner density and that transferred to the printable area Amount of toner no longer linear. This makes it especially great Toner densities, which are caused by a large size applied to individual image areas Amount of toner does not result in precise control of the printing process in all Cases possible.
  • a method having the features of claim 1 proposed. It is envisaged that at least one print on the printable area, for example paper, cardboard, plastic or the like, is applied. Then, with the help of a measuring device, the printable Area transferred amount of toner measured and the deviation of the im Area of printing applied, measured amount of toner (actual amount of toner) and a desired amount of toner (target amount of toner in the printing) determined. The difference between the actual amount of toner and the desired amount of toner is used to influence the printing process, the influencing being such that the one transferred to the substrate Amount of toner to form the print depending on the respective Deviation is decreased or increased so that the difference between the ACTUAL toner quantity and the TARGET toner quantity becomes smaller.
  • the Difference between the ACTUAL toner quantity and the TARGET toner quantity within within a certain tolerance range is a decrease or increase the amount of toner applied to the printable area and thus an influence the control of the printing press is not required, so the Difference remains the same.
  • the direct measurement of the printable area amount of toner transferred enables very precise control of the printing process, even if the printing has high toner densities.
  • To the To optimize the printing process and to further increase the sensitivity it is envisaged that in advance for measuring the toner occupancy, that is to say with a certain setting of the printing process or the printing press amount of toner transferred to the printable surface, at least at first a test image on a transport surface of a transport device for the substrate is applied.
  • the term transport area usually refers to one Part of a conveyor belt of the transport device.
  • the measuring step is by applying the test pattern to the transport surface regardless of the Condition of the substrate, such as moisture or thickness fluctuations. Further the waste of the substrate is avoided in the case of faulty amounts of toner, since printing on the substrate only begins when the difference between the ACTUAL toner quantity and the TARGET toner quantity within a certain tolerance range lies, i.e. is adjusted to the desired level.
  • a printing press which Features of claim 7. It is characterized by a measuring device with the help of the amount of toner applied to the printable surface can be determined. With the help of the measuring device an exact determination is possible that within a single image area or a print amount of toner applied can be determined. This enables precise control of the printing process, the measuring device being designed such that the respective Amount of toner in a print, both small and large Toner densities can be determined precisely.
  • the subject matter of the invention also relates to a measuring device for determination preferably on a printable surface, in particular on a substrate Paper or cardboard, or applied to a transport surface for a substrate Amount of toner having the features of one or more of claims 7 to 17.
  • the measuring device is therefore in connection with a printing press can be used and is used to measure the amount applied to a printable surface Amount of toner.
  • the shape and / or size of at least one test image is advantageously the at least one adapted an electrode of the first capacitive sensor. Because the toner have different relative permittivities ⁇ for different colors at least one test image is preferably printed for each color and for different amounts of toner the characteristic "amount of toner per area to the sensor output signal "of the sensor. For mixed colors, the Characteristic curve of the sensor can also be determined.
  • the measuring device has at least one first, capacitive sensor, which, for example, as a proximity switch or Distance measuring device is formed.
  • capacitive Sensors The structure and function of the capacitive Sensors is known in the literature, for example from “Inductive and capacitive Sensors “by Andreas Schiff, Verlag Moderne Industrie (1989) and” Sensortechnik “ by Harry Herold, Wegig Verlag Heidelberg (1993), whose content regarding the structure and function of the capacitive sensor this application is made.
  • a Proximity switches or a distance measuring device will include the capacity change measured by a capacitor. With a constant electrode area the capacity by increasing the distance between the two electrodes of the capacitor or by changing the effective relative permittivity Change ⁇ of the medium between the electrodes.
  • the two capacitor plates are replaced by the first, capacitive sensor and the measurement object, especially the stressed printable Area, formed.
  • the first, capacitive Sensor of a transport surface of a transport device for the substrate is fixed at a distance and opposite each other. by virtue of This arrangement results in the printable area and the area applied to it Toner passing through the gap between the sensor and the Transport surface on which the substrate rests, a change in the relative Dielectric constant ⁇ of the medium between the capacitor plates (sensor and printable area). This change causes a corresponding change of the sensor output signal and can be used to control the printing process be used. With the help of the control, the printable area is printed or the printable areas each applied amount of toner increased or possibly reduced.
  • the toner on the printable area is fixed, for example, in a known manner is melted.
  • the toner quantity measurement when transferred to the printable surface in the unfixed Toner condition.
  • the aforementioned "measurement object” is first the transport area, for example is formed by a conveyor belt. As soon as the printing with a certain amount of toner having printable area in the space between the sensor and the transport surface, the “measurement object” formed by the printable area. It should be noted that with the help the first, capacitive sensor, the distance between the fixed Sensor and the printable and printed area is measured. The amount of toner applied to the printable surface gives a constant amount Area having printing a certain toner density, with increasing toner density the distance between the sensor and the printable Area becomes smaller. In other words, the bigger the one at a time Amount of toner applied, the higher the amount of toner above the surface of the printable area and the smaller it is distance measured with the aid of the capacitive sensor and the printable area or the printing.
  • the first capacitive sensor is triggered in such a way that that at the time the distance between himself and the measurement object (Transport surface or substrate) in which the test pattern is exactly below it or between that limited by the sensor and the transport surface Gap is located.
  • capacitive sensor can for example signals from the existing control devices of the printing press can be used, which simplifies their construction.
  • Figure 1 shows a section of an embodiment of a general use Printing machine 1, for example an electrophotographic printing machine, for applying liquid or powdered toner to a Substrate 3, which is formed here purely by way of example from a sheet of paper 5.
  • Printing machine 1 for example an electrophotographic printing machine, for applying liquid or powdered toner to a Substrate 3, which is formed here purely by way of example from a sheet of paper 5.
  • construction and the function of the printing press are generally known, for example from EP 0 786 705 A1 or EP 0 713 155 A2, so that no further details are given here it will be discussed.
  • the printing press 1 has a plurality of printing units, with the aid of which at least in each case printing 7 in at least one specific color, for example Black, yellow, magenta, cyan or a mixed color, on the substrate 3 in is transmitted in a known manner.
  • printing unit 9 is shown schematically.
  • a transport device is located below the stationary printing unit 9 11 arranged, a in the embodiment shown in Figure 1 Endless conveyor belt 13, which with the help of a drive device, not shown is horizontally displaceable in the machine direction 15 (arrow).
  • the guide of the conveyor belt 13 is selected so that it is in the area of Printing unit 9 and in the upstream and downstream of the printing unit 9 Areas at a distance from this.
  • the conveyor belt 13 has a transport surface 17 on which with the help of the printing unit 9 to be printed on substrates 3 in machine direction 15 one behind the other and / or along the width of the printing press 1 filed and by moving the conveyor belt 13 below the Printing unit 9 are guided past this.
  • the help of the printing unit 9 a certain, adjustable amount of toner in the form of printing 7 on the Transfer substrate 3, whereby a certain toner density of the printing 7 sets.
  • the printing unit 9 is a first, capacitive sensor Subordinate 19/1 to 19/3, as part of a measuring device, not shown 21 for determining the amount of toner applied to the substrate 3 serves.
  • the first sensor 19/1 to 19/3 is at a fixed distance from the Transport surface 17 of the conveyor belt 13 is arranged.
  • the capacitive sensor 19/1 to 19/3 is designed as a proximity switch or as a distance measuring device, its operating principle is based on the change in capacitance of a capacitor is measured.
  • the two capacitor plates are here by the first sensor 19/1 to 19/3 and the measurement object formed.
  • the measurement object is in Depending on the position of the substrate 3, either the unprinted or printed Transport surface 17 of the conveyor belt 13, as shown in Fig.
  • the capacitance of the capacitor can be increased by increasing the distance between the two electrodes, i.e. between the first sensor 19/1 to 19/3 and the measurement object or by changing the effective relative permittivity Change ⁇ of the medium between the electrodes. This makes it possible the amount of toner actually applied to the substrate (actual amount of toner) to determine for the printing 7 having a certain area.
  • control device for example the control device for electrophotographic Printing machine 1
  • TARGET toner amount the one certain toner density of the printing 7 ensures.
  • control of the electrophotographic process is changed so that the deviation of the measured actual toner quantity from the desired one TARGET amount of toner becomes smaller or may remain the same. Due to the direct measurement of the amount of toner transferred to the substrate 3 the amount of toner transferred from the printing unit 9 to the substrate 3 accordingly customized. In this way, a control loop can be implemented that automates of the process.
  • the measuring device 21 can of course also have several first sensors Have 19/1 to 19/3, across the width of the printing press 1, that is, across distributed over the width of the conveyor belt 13 at a distance from each other are arranged ( Figure 2).
  • first sensors Have 19/1 to 19/3, across the width of the printing press 1, that is, across distributed over the width of the conveyor belt 13 at a distance from each other are arranged ( Figure 2).
  • 15 behind each of the printing units of printing machine 1 at least one first capacitive sensor 19/1 to 19/3 is arranged.
  • the at least one first capacitive sensor 19/1 to 19/3 in the machine direction 15 behind one in the figure 1 treatment device (not shown) (web conditioning charger) for the conveyor belt 13 is arranged.
  • the treatment facility electrical charges and possibly dirt particles and toner residues removed from the transport surface 17 before the measurement.
  • the measuring accuracy of the measuring device 21 or the capacitive Sensors 19/1 to 19/3 can, for example, have a different thickness of the conveyor belt 13 can be influenced, since fluctuations in the thickness of the Conveyor belt 13 and its composition the effective relative permittivity change ⁇ . To possibly existing thickness fluctuations of the To be able to take conveyor belt 13 into account at the times of Distance between the fixedly arranged first sensor 19/1 to 19/3 and the measurement object can be measured if only the conveyor belt 13 without substrate 3 placed thereon is located under sensor 19/1 to 19/3. The measured Values can be used for correction.
  • a further influence on the measuring accuracy of the measuring device 21 is exerted Moisture of the sheet of paper 5.
  • a comparison measurement between unprinted Sheets of paper and concrete sheets of paper help to reduce measurement errors.
  • Another option is to have at least one test pattern 23/1, 23/2, 23/3, 23/4 to print directly on the transport surface 17 of the conveyor belt 13, such as shown in Fig. 3.
  • FIG. 2 shows a top view of the transport surface 17 of the conveyor belt 13.
  • the test patterns 23/1, 23/2, 23/3, 23/4 are on the Substrate 3 applied, which is on the conveyor belt 13, whereby for the colors Black, yellow, magenta and cyan each have three test images 23/1, 23/2, 23/3 or 23/4 are printed.
  • Each printed in one color Test images 23/1, 23/2, 23/3, 23/4 are at a distance from each other across the Spread the width of the substrate 3, that is, one test image 23/1, 23/2, 23/3, 23/4 with different color is seen in the machine direction 15 in a row.
  • Each of the test image series 25/1 to 25/3 is a first, capacitive sensor 19/1, 19/2 or 19/3 assigned, as in Figure 2 indicated - at least one electrode with a circular cross section here having. It is clear that the shape and size of the Test patterns 23/1, 23/2, 23/3, 23/4 and. arranged in a rectangular matrix the shape and size of the first capacitive sensors 19/1 to 19/3 is the same. The shape and / or size of the test images 23/1, 23/2, 23/3, 23/4 and the electrodes the first, capacitive sensors 19/1 to 19/3 can be varied practically as desired.
  • the toners have different relative permittivities for different colors can have ⁇ in an advantageous embodiment a toner quantity measurement was carried out for each color and each mixed color, so that a characteristic of the amount of toner per area of the test image or Printing 7 determined for the sensor output signal of sensors 19/1 to 19/3 can be.
  • the measuring sensitivity of the measuring device 21 can also be caused by distance fluctuations between the conveyor belt 13 and the at least one capacitive Sensor 19/1 to 19/3 can be influenced.
  • the conveyor belt 13 is shown in FIG Embodiment below the sensor 19/1 to 19/3 on a special Guide rail 27 guided, which is a flat contact of the conveyor belt 13th guaranteed.
  • the guide rail 27 is flat and horizontal arranged. You can in another, not shown embodiment also be curved.
  • a further reduction of the measurement error due to distance fluctuations between the stationary capacitive sensor 19/1 to 19/3 and the Conveyor belt 13 is reached by the distance between the sensor 19/1 to 19/3 and the guide rail 27 is measured.
  • a second sensor not shown, which is made of metal existing guide rail formed by an inductive displacement sensor can be.
  • Distance fluctuations for example due to machine vibrations can be caused, are so detectable and can in the Measurement of the amount of toner transferred to the printable area is taken into account become.
  • the first sensors 19/1 to 19/3 and the at least one second sensor combined to form a sensor system, that can form a structural unit, for example.
  • a capacitive sensor 19/1 to 19/3 or more capacitive Sensors 19/1 to 19/3 after each of the printing units of the printing press 1 can be arranged.
  • a sensor 19/1 to just behind the last printing unit of printing machine 1 19/3 or more capacitive sensors 19/1 to 19/3 are arranged.
  • FIG. 3 shows an arrangement similar to FIG. 2 with the essential differences, that the test pattern 23/1, 23/2, 23/3, 23/4 only from a series of test patterns 25/4 exists and the test pattern 23/1, 23/2, 23/3, 23/4 immediately on the Transport surface 17 is applied.
  • the measurement method is that described above accordingly, the capacitive sensor 19/1 to 19/3 detects one after the other the test images 23/1, 23/2, 23/3, 23/4, each containing toner of one color.
  • the change in capacitance of the capacitive sensor 19/1 to 19/3 is based on 3 in a similar manner on the change of the distances between the capacitive sensor 19/1 to 19/3 and the transport surface 17 on the one hand and the respective test pattern 23/1, 23/2, 23/3, 23/4 on the other.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Color Electrophotography (AREA)
EP01123542A 2000-10-13 2001-09-29 Méthode et machine d'impression pour l'application de toner sur un substrat et dispostif de mesure pour une machine d'impression Withdrawn EP1197808A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10050659A DE10050659A1 (de) 2000-10-13 2000-10-13 Verfahren und Druckmaschine zum Aufbringen von Toner auf ein Substrat und Messeinrichtung für eine Druckmaschine
DE10050659 2000-10-13

Publications (1)

Publication Number Publication Date
EP1197808A2 true EP1197808A2 (fr) 2002-04-17

Family

ID=7659594

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Application Number Title Priority Date Filing Date
EP01123542A Withdrawn EP1197808A2 (fr) 2000-10-13 2001-09-29 Méthode et machine d'impression pour l'application de toner sur un substrat et dispostif de mesure pour une machine d'impression

Country Status (4)

Country Link
US (1) US6587653B2 (fr)
EP (1) EP1197808A2 (fr)
JP (1) JP2002182440A (fr)
DE (1) DE10050659A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020187541A1 (fr) * 2019-03-20 2020-09-24 Siempelkamp Maschinen- Und Anlagenbau Gmbh Dispositif pour surveiller l'état de lubrification d'une bande en déplacement soumise à l'effet d'un lubrifiant pour le transport d'une matière pressée

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6795101B2 (en) * 2001-04-27 2004-09-21 Oce-Technologies B.V. Direct imaging process with feed back control by measuring the amount of toner deposited
DE10151703B4 (de) * 2001-10-19 2004-12-09 OCé PRINTING SYSTEMS GMBH Vorrichtung und Verfahren zum Erfassen der Beschaffenheit einer Tonerteilchenschicht in einem Drucker oder Kopierer
US7058321B2 (en) * 2003-03-27 2006-06-06 Seiko Epson Corporation Device and method of calculating toner consumption, and image forming apparatus using the same
US8869258B2 (en) * 2010-03-12 2014-10-21 Microsoft Corporation Facilitating token request troubleshooting

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3009179B2 (ja) * 1990-04-16 2000-02-14 株式会社日立製作所 静電記録装置及び静電潜像測定装置
JPH0833686B2 (ja) * 1990-07-30 1996-03-29 松下電器産業株式会社 画像濃度制御装置
JP3030975B2 (ja) * 1991-10-04 2000-04-10 松下電器産業株式会社 画質制御装置
US5307119A (en) * 1992-12-31 1994-04-26 Xerox Corporation Method and apparatus for monitoring and controlling a toner image formation process
JP3164961B2 (ja) * 1994-03-18 2001-05-14 株式会社日立製作所 画像記録装置と画質制御方法
JP2933603B1 (ja) * 1998-04-10 1999-08-16 日本電気データ機器株式会社 印刷濃度制御方法及び電子写真プリンタ装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020187541A1 (fr) * 2019-03-20 2020-09-24 Siempelkamp Maschinen- Und Anlagenbau Gmbh Dispositif pour surveiller l'état de lubrification d'une bande en déplacement soumise à l'effet d'un lubrifiant pour le transport d'une matière pressée

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Publication number Publication date
US6587653B2 (en) 2003-07-01
US20020044785A1 (en) 2002-04-18
JP2002182440A (ja) 2002-06-26
DE10050659A1 (de) 2002-04-18

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