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EP0890140A1 - Procede et circuit pour l'impression d'une image imprimee - Google Patents

Procede et circuit pour l'impression d'une image imprimee

Info

Publication number
EP0890140A1
EP0890140A1 EP97920556A EP97920556A EP0890140A1 EP 0890140 A1 EP0890140 A1 EP 0890140A1 EP 97920556 A EP97920556 A EP 97920556A EP 97920556 A EP97920556 A EP 97920556A EP 0890140 A1 EP0890140 A1 EP 0890140A1
Authority
EP
European Patent Office
Prior art keywords
frequency
printing
carrier material
signal
sif
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.)
Granted
Application number
EP97920556A
Other languages
German (de)
English (en)
Other versions
EP0890140B1 (fr
Inventor
Georg Coufal
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems GmbH and Co KG
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 Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP0890140A1 publication Critical patent/EP0890140A1/fr
Application granted granted Critical
Publication of EP0890140B1 publication Critical patent/EP0890140B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6517—Apparatus for continuous web copy material of plain paper, e.g. supply rolls; Roll holders therefor
    • G03G15/6526—Computer form folded [CFF] continuous web, e.g. having sprocket holes or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • 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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting

Definitions

  • the invention relates to a method for printing a print image on an endless carrier material with respect to a predetermined position in an electrographic printer.
  • Electrographic printers are known in which a motor drives a transport device which transports the carrier material past a transfer printing station essentially in accordance with a predetermined printing speed. During the printing process, print images generated by a print controller are successively printed on the transfer material at the transfer printing station. If the transport device transmits a forward movement to the carrier material by positive locking, as e.g. when transport spikes engage in transport holes of a carrier material perforated in the edge regions, a forced movement between the carrier material and the transport device is realized within certain limits.
  • the transport device transmits the forward movement to the carrier material by frictional engagement, in that a rubberized transport roller or a conveyor belt is in frictional contact with the carrier material, a forced movement between carrier material and transport roller or conveyor belt is prevented by various influencing factors.
  • These influencing factors include micro-slip, which occurs due to the fact that the frictional connection between the drive roller and the carrier material is not 100% guaranteed.
  • Another influencing factor lies in the mechanical tolerances in the manufacture of the drive roller and in its storage in the transport device. There is therefore no forced running between the carrier material and the drive roller. Because the transport speed of the carrier material never completely coincides with the speed of the drive roller, synchronism between carrier material and printing process is excluded.
  • offset forms are applied to the carrier material, into which numbers or letters are to be printed in the specified form fields during the printing process, an offset between the letters and the form fields increases with each printed form due to the minimal speed difference. Interrupting the printing process is inevitable in order to correct the offset again.
  • PLL - phase locked loop generates the frequency of a stepping motor for driving the transport device and for an exposure line for exposing the photoconductor drum.
  • a disadvantage of this solution is that mechanical stiffness, fluctuations in the mains frequency, etc. are not completely corrected.
  • more complex electronic units are necessary, which mostly work according to an analog principle, i.e. Process continuous voltage values.
  • the object of the invention is to provide a simple, digital solution for printing on continuous carrier material, which enables offset-free printing with respect to a predetermined position.
  • the invention is based on the finding that with essentially constant transport speed of the carrier material, the offset is increased cumulatively from printed image to printed image. To offset Accordingly, only minimal changes in speed of the transport speed of the carrier material are necessary to correct. The transport speed can therefore be used as a reference for measuring the offset, despite slight fluctuations.
  • markings for positioning the printed images in the transport direction are present on the carrier material at regular intervals.
  • a print image start signal is generated by the print controller.
  • the markings must always be in the same positions with respect to the transfer printing station due to the same distance and the essentially constant transport speed when the start of the print image signal occurs.
  • An offset manifests itself in that the markings with respect to a selected reference point in the vicinity of the transfer printing station slowly change their position from print image to print image when only snapshots at the reference point at the time of the print image start signal are viewed.
  • a signal pick-up is fixed in place with respect to the transfer printing station and generates a marking signal when a marking is detected.
  • markings lying in front of the signal pickup will move towards or away from the signal pickup if successive snapshots are viewed at times with an active print image start signal, depending on whether the transport speed of the carrier material is slightly greater or slightly less than the printing speed is.
  • Signal pickup can be the distance from the mark closest to the signal pickup in the direction of transport
  • Offset measurement can be used by measuring the time This marker is required in order to reach the signal recorder.
  • a counting process of clock signals in a counter is started.
  • the counting process is interrupted when the next marking signal occurs on the signal pickup.
  • the counting result is in a ratio determined by the clock signals to the time which the next marking needs to reach the signal pickup. From this time, the distance of the marking from the signal pickup at the time of the print image start signal can be calculated by multiplying by the printing speed. In particular, an offset can be detected when this distance changes from print image to print image.
  • the counter result is compared with a target value, which corresponds to a counter reading when the print images are positioned without offset with respect to the marking.
  • the frequency of a current pulse sequence that controls a stepper motor that drives the transport device is increased. If the counting result is less than the setpoint, the frequency of the current pulse sequence is reduced, so that the marking on the next print image start signal moves away from the signal pickup.
  • Both the counter and the stepper motor control can be carried out digitally. Since a microprocessor is present in the printer, the comparison can also be easily carried out digitally. In the invention, only a counter and a slightly modified pulse control for the stepper motor have to be used to synchronize the transport speed of the carrier material and the printing speed.
  • trans Port-free carrier material requires offset-free printing only if the carrier material is already printed with form forms before the printing process, for example by offset printing. The additional effort required to apply the markings in offset printing is likewise low, since the markings are printed on at the same time as the forms.
  • a pulse generator contains a divider and a frequency multiplier, the divider being clocked on the input side with a basic clock of the basic frequency and outputting an output pulse sequence which has a frequency which is determined by the ratio of the basic frequency and one by the comparison result certain divisor value is defined.
  • the frequency multiplier multiplies the frequency of the output pulse train by an integer value and outputs the control pulse train. This measure ensures that the positioning accuracy is increased, because in order to achieve e.g. higher dividing values are necessary due to the working frequency range of the stepping motor determined by the transport device than without using a frequency multiplier.
  • each divider step i.e. an increase or a decrease by one, smaller frequency changes in the predetermined frequency working range. Smaller frequency changes have the consequence that the carrier material is also only displaced by small distances, so that a small offset can also be corrected.
  • the invention further relates to a circuit arrangement with the features of claim 1.
  • the circuit arrangement serves to carry out the method according to the invention, so that the above-mentioned effects are also transferred to the circuit arrangement.
  • FIG. 1 shows a basic illustration of an electro-graphic printer
  • FIG. 3 shows three variants for generating a current pulse sequence for a stepper motor
  • FIG. 4 shows a diagram to illustrate the relationship between the divider value and the frequency of the current pulse sequence
  • FIG. 5 time profiles of a start of page signal, a marking signal and a count signal
  • FIG. 6 shows a flow diagram of a method for offset-free printing of the printed images with respect to the markings.
  • FIG. 1 shows a basic illustration of an electrographic printer 10 and a block diagram of essential electrical functional units for controlling a stepper motor 12.
  • the printer 10 has a transport device 14, which is driven by the stepper motor 12 via a shaft 13, which is arranged near a transfer station 16, and endless carrier material 20 transported past the transfer station 16 essentially in accordance with a predetermined printing speed VD.
  • a charge image applied to a photoconductor drum 18 and colored with toner is transferred to the endless carrier material 20 by means of a corona device (not shown).
  • the photoconductor drum 18 rotates in the direction of the arrow 22. After the transfer printing, residues of the toner are removed and the surface of the Photoconductor drum 18 rotates past an exposure line 24 which exposes the photoconductor drum 18 again.
  • a first deflection unit 30, which feeds the carrier material 20 to the transfer station 16 is arranged in front of the transfer station 12 in the direction of transport indicated by an arrow 28.
  • a second deflection unit 32 is arranged after the fixing station 26, as seen in the transport direction. This second deflection unit 32 stacks the printed carrier material 20 onto a stack 34.
  • the carrier material 20 is removed from a stack 36 by the first deflection unit 30. Instead of the two stacks 34 and 36, rolls are also used, on which the carrier material 20 is rolled up.
  • the printing process is controlled by a print controller 38.
  • the print controller 38 generates the print images page by page by transmitting the image information in one line to the exposure line 24 via data lines 40.
  • the print images are printed in succession at the transfer station 16 at the printing speed on the carrier material 20.
  • the print control 38 At the beginning of the printing of a page, the print control 38 generates a start page signal SAS on a data line 42, which releases a counter 44 which counts the pulses of a counting clock sequence on a counting clock line 46.
  • the frequency of the counting clock sequence ZTF is approximately 100 kHz.
  • markings 48 on the carrier material 20 which were printed on the carrier material 20 by an offset printing prior to the printing process.
  • the markings 48 were printed on the carrier material 20 at the same time as the form preprinting 50 and are shown in FIG a fixed predetermined position with respect to the forms 50 arranged.
  • a light barrier 52 scans the carrier material 20 for the markings 48.
  • the light barrier 52 contains a light transmitter 54 for emitting a light beam 56 and a light receiver 58, which the light beam 56 strikes when none of the markings 48 is between the light transmitter 54 and the light receiver 58.
  • the light receiver 56 contains a circuit which, when a marking is detected, generates a marking signal MS which is transmitted to the counter 44 on a signal line 60 and interrupts the counting process in the counter 44.
  • the pressure controller 38 also contains a microprocessor 62 which, after the counting process has been completed, reads the counting result from the counter 44 via data lines 64 and compares it with a target value.
  • the setpoint corresponds to a counter reading when the print images are positioned without offset with respect to the markings 48. Offset-free means that letters contained in the print images are printed precisely in the fields provided on the form forms 50 for this purpose.
  • the stepper motor 12 which is connected in a rotationally fixed manner to the transport device 14 via the shaft 13, must be controlled such that it rotates faster or slower depending on the direction of the deviation.
  • the stepper motor 12 is controlled by a current pulse sequence SIF, which is generated by a pulse generator 66.
  • the current pulse sequence SIF is transmitted from the pulse generator 66 to the stepper motor 12 via a control line 68.
  • the pulse generator 66 is clocked on the input side with a basic clock which has a basic clock frequency of 10 MHz.
  • the frequency of the current pulse sequence SIF is in a ratio to the basic frequency determined by an integer divisor value TW. frequency.
  • the divider value TW is transmitted by the microprocessor 62 to the pulse generator 66 via data lines 72.
  • the divider value TW is predetermined by the microprocessor 62 so that the speed V of the carrier material 20 corresponds to the printing speed VD in the transport direction. If there are differences between the speed V and the printing speed VD during the printing process, for example due to micro-slip of a drive roller of the transport device 14 on the carrier material 20, the counting result will deviate from the target value.
  • the divider value TW is increased by the microprocessor 62 when the speed V is greater than the printing speed VD. In this case, the markings 48 are offset from the printed image in the transport direction 28.
  • the divider value TW is reduced by the microprocessor 62 when the markings 48 are set back in the transport direction 28 with respect to the printed images.
  • the pressure controller 38 is connected via data lines 74 to an input / output device 76, via which e.g. the printing speed VD can be specified by an operator.
  • FIG. 2 shows three positional relationships between the light barrier 52 and markings 48a, 48b, 48c, which are applied to the carrier material 20.
  • snapshots are shown in FIG. 2, which correspond to a position of the markings 48a, 48b and 48c in each case at the beginning of the printing of a printing page, that is to say exactly at the moment when the start of page signal signals the beginning of a new printing page.
  • Part a of FIG. 2 shows a marking 48a, which is at the beginning of a new printed page by the distance sl from the light barrier 52.
  • the instantaneous speed V of the carrier material 20 essentially corresponds to the printing speed VD.
  • the instantaneous speed V only by a maximum of a few thousandths from the printing speed VD, so that the instantaneous speed V is considered constant when determining the distance between the marking 48a and the light barrier 52 at the time of a new start.
  • the counting result corresponds to a time tl which the marking 48a needs to pass through the path sl.
  • the microprocessor can calculate the length of the distance sl by multiplying the assumed instantaneous speed V by the time tl. In the case of part a of FIG. 2, the microprocessor determines that the distance sl corresponds exactly to a desired distance sO, which ensures that the printed images are aligned with the markings 48. Specifically, the print image will also be aligned near the marker 48a with respect to this marker.
  • Part b of FIG. 2 shows the case where a distance S2 is present between a marking 48b and the light barrier 52 at the time when a page begins to print.
  • the counting result in case b is higher than the counting result in case a, since the assumed instantaneous speed V is regarded as constant and a larger distance s2 has to be covered.
  • the microprocessor 22 calculates the distance s2 by multiplying the instantaneous speed V by a time t2 corresponding to the increased count result.
  • the microprocessor 62 can thus determine that the distance s2 is greater than the desired distance s0.
  • the marking 48b lies in the transport direction in front of a dashed line 80 which represents an end point of the desired distance s0.
  • the other end point of the desired distance s0 is the light barrier 52.
  • the markings 48 hurry after the printed images.
  • the microprocessor 62 will increase the partial value TW in the pulse generator 66.
  • Part c of FIG. 2 shows the case in which a distance s3 between a marking 48c and the light barrier 52 is smaller than the target distance s0 at the time when a page begins to print.
  • the marking 48c lies behind the dashed line 80 in the transport direction.
  • the counting result in the counter 44 lies below the target value.
  • the microprocessor 62 determines the length of the distance s3 by again multiplying the assumed instantaneous speed V by the count result, which corresponds to a time t3.
  • the markings 48 lead ahead of the printed images.
  • the marking 48c is thus offset in the transport direction with respect to a print image to be printed in its vicinity.
  • the microprocessor 62 will reduce the divider value TW.
  • FIG. 3 shows three variants I to III for generating the current pulse sequence SIF for the stepper motor 12 in the pulse generator 66.
  • Part a of FIG. 3 shows a first exemplary embodiment of the pulse generator 66.
  • the pulse generator 66 contains a divider 90 which is clocked on the input side with the basic clock on the basic clock line 70 and in which the divider value TW is stored via the data lines 72.
  • the output of divider 90 is connected directly to control line 68.
  • the frequency of the current pulse sequence SIF is thus defined by the ratio of the fundamental frequency and the divider value TW.
  • Part b of FIG. 3 shows a second exemplary embodiment of a pulse generator 66 ', which is used instead of the pulse generator 66.
  • the pulse generator 66 ' contains a divider 90', the mode of operation of which corresponds to that of the divider 90 already explained in part a of FIG.
  • An output pulse sequence AIF of the divider 90 ' is connected on the input side to a frequency doubler 94 via a data line 92.
  • the frequency doubler 94 doubles the frequency of the output pulse sequence AIF and generates on the output side on the control line.
  • device 68 the current pulse sequence SIF.
  • the use of the pulse generator 66 ′ leads to a more precise positioning of the carrier material 20 than when the pulse generator 66 is used.
  • Part c of FIG. 3 shows a third variant III for generating the current pulse sequence SIF, in which the pulse generator 66 'is used.
  • the time interval between two successive comparisons of the microprocessor 62 is divided into two time segments.
  • a divider value TW1 is stored in the divider 90 'and in the second time interval a divisor value TW2 is stored in the divider 90'.
  • the mode of operation of variant III is also explained below with reference to FIG. 4.
  • FIG. 4 shows in a diagram the dependence of the frequency of the current pulse sequence SIF on the size of the divider value TW in the pulse generator 66 or 66 '.
  • the divisor value TW is plotted on the abscissa axis 100. Numbers in curly brackets refer to a basic clock frequency of 1 MHz, numbers without brackets to a basic clock frequency of 10 MHz and numbers in square brackets to a basic clock frequency of 100 MHz.
  • the frequency of the current pulse sequence SIF in Hertz is plotted on the ordinate axis 102.
  • a curve 104 represents the relationship between the divider value TW and the frequency of the current pulse sequence SIF for variant I.
  • the frequency of the current pulse sequence SIF at a base clock frequency of 10 MHz and a divider value TW of 2000 at a point P1 is 5000 Hz the divisor value TW can only take integer values, the curve profile 104 consists of a point sequence.
  • a basic clock frequency of 10 MHz was selected in the exemplary embodiment. This represents a compromise between the circuit complexity and the distance between two adjacent points on the curve 104.
  • a curve 106 establishes the relationship between the divider value TW and the basic clock frequency.
  • the divider value for setting the same frequency of the current pulse sequence SIF must be twice as high as in variant I.
  • a point P1 ' is assigned a divider value TW of 4000 and a frequency of the current pulse sequence SIF of 5000 Hz.
  • a point P2 ' is assigned a divisor value TW of 6000 and a frequency of the current pulse sequence of 3333 Hz.
  • points P1 * and P2 ' there are twice as many points on curve 106 as between points P1 and P2 on curve 104. As a result, the resolution of curve 106 has doubled compared to curve 104.
  • Variant III of FIG. 3 is based on curve shape 106, but the resolution is increased again compared to variant II by weakening the frequency jump of the current pulse sequence SIF given by the integer divisor value TW by the fact that only an absolutely necessary part of the frequency jump for the correction of the position of the markings 48 in relation to the printed image.
  • the principle of variant III can of course also be used in a variant IV in the pulse generator 66.
  • FIG. 5 shows a time profile 110 of the start of page signal SAS, a time profile 112 of the marking signal MS and a time profile 114 of a count signal ZS. Furthermore, part of a time line 116 is shown in FIG. 5, which serves as a reference variable for the time profiles 110 to 114.
  • a Time ZP1 the voltage value of the count signal ZS is increased by a voltage pulse II of the side start signal SAS, whereby the counting process in the counter 44 is started.
  • the counting signal ZS is switched to a lower voltage value by a voltage pulse 12 of the marking signal MS, as a result of which the counting process in the counter 44 is stopped.
  • the microprocessor 62 determines a new divider value TW1 from the count result in the counter 44 and stores it in the divider 90 or 90 'if it deviates from the divider value TWO.
  • a divisor value TW2 is stored in divider 90 'after a predetermined time t4.
  • the pressure control 38 generates a voltage pulse 13 of the start of page signal SAS, which initiates a new counting process as described above. After this counting process is completed, a divisor value TW3 is stored in the counter 90 or 90 '.
  • FIG. 6 shows a flow diagram of the method for offset-free printing of the printed images with regard to the markings 48.
  • the method begins in a step 200 with an initialization phase from steps 202 and 204.
  • the divider 90 or 90 ' is replaced by a Initialized divider value TW, which leads to a speed V of the carrier material 20 which corresponds approximately to the printing speed VD.
  • TW Initialized divider value
  • the carrier material 20 is aligned in the transport direction 28 such that the markings 48 are aligned on a setting ruler, so that the first printed images have no offset with respect to the markings 48.
  • the microprocessor 62 waits until a first count in counter 44 is complete.
  • a step 206 the microprocessor 62 reads the count result from the counter 44 and in a step 208 determines a new divider value in the case of variants I and II or two new divisor values TW in the case of variants III and IV.
  • the divisor value TW1 is transmitted via data lines 72 to divisor 90 and 90 '.
  • a step 212 the microprocessor 62 checks whether the variants III or IV are active. If this is not the case, the method is continued in a step 218. If variant III or IV is active, the microprocessor 62 waits in a step 214 until a time calculated in step 208 has passed, in order then to transmit the second divider value TW2 to the divider 90 or 90 "in a step 216 the method then continues in step 218, in which the microprocessor 62 waits for a new counting result. If a new counting result is present, the microprocessor 62 checks in a method step 220 whether the printing should be ended if this is the case, the process is continued in a loop from steps 206 to 220. If the microprocessor 62 determines in step 220 that the printing is to be ended, it ends the process in a step 222.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Handling Of Sheets (AREA)

Abstract

L'invention concerne un procédé pour l'impression d'une image imprimée sur un matériau-support sans fin (20), par rapport à une position prédéterminée, dans une imprimante électrographique (10), selon lequel un moteur pas à pas (12) commandé par une séquence d'impulsions de courant (SIF) entraîne un dispositif transporteur (14) acheminant le matériau-support (20) à un poste de transfert (16), à une vitesse d'impression prédéterminée (VD). Les images imprimées lors du processus d'impression sont produites l'une après l'autre sur le matériau-support (20); au début de l'impression d'une image, un signal initial d'image (SAS) est produit par la commande d'impression (62), ce signal démarrant un processus de comptage de signaux de synchronisation (ZTF) dans un compteur (64); un récepteur de signaux (58) détecte sur le matériau-support (20) des marques (48) prévues à des intervalles réguliers pour le positionnement. Le récepteur de signaux (58) fournit, lors de la détection d'une marque (48), un signal de marquage (115) qui interrompt le comptage à l'apparition du signal de marquage (115), ou après apparition d'un nombre fixe de signaux de marquage (115); le résultat du comptage est comparé à une valeur de consigne (étape 208) qui correspond à un état du compteur pour un positionnement non décalé des images imprimées par rapport aux marques (48), la fréquence de la séquence des impulsions de courant (SIF) étant réglée en fonction du résultat de la comparaison (étapes 210, 216).
EP97920556A 1996-03-27 1997-03-26 Procede et circuit pour l'impression d'une image imprimee Expired - Lifetime EP0890140B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19612176 1996-03-27
DE19612176 1996-03-27
PCT/DE1997/000642 WO1997036211A1 (fr) 1996-03-27 1997-03-26 Procede et circuit pour l'impression d'une image imprimee

Publications (2)

Publication Number Publication Date
EP0890140A1 true EP0890140A1 (fr) 1999-01-13
EP0890140B1 EP0890140B1 (fr) 2002-12-04

Family

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Family Applications (1)

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EP97920556A Expired - Lifetime EP0890140B1 (fr) 1996-03-27 1997-03-26 Procede et circuit pour l'impression d'une image imprimee

Country Status (5)

Country Link
US (1) US6164848A (fr)
EP (1) EP0890140B1 (fr)
JP (1) JP2000507170A (fr)
DE (1) DE59708889D1 (fr)
WO (1) WO1997036211A1 (fr)

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Also Published As

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WO1997036211A1 (fr) 1997-10-02
JP2000507170A (ja) 2000-06-13
EP0890140B1 (fr) 2002-12-04
DE59708889D1 (de) 2003-01-16
US6164848A (en) 2000-12-26

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