EP0406236B1 - Dispositif de controle du transport de supports d'enregistrement en feuilles dans une machine d'impression par electrophotographie - Google Patents

Dispositif de controle du transport de supports d'enregistrement en feuilles dans une machine d'impression par electrophotographie Download PDF

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Publication number
EP0406236B1
EP0406236B1 EP88904913A EP88904913A EP0406236B1 EP 0406236 B1 EP0406236 B1 EP 0406236B1 EP 88904913 A EP88904913 A EP 88904913A EP 88904913 A EP88904913 A EP 88904913A EP 0406236 B1 EP0406236 B1 EP 0406236B1
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EP
European Patent Office
Prior art keywords
light barrier
edge
transport
side edge
measuring device
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.)
Expired - Lifetime
Application number
EP88904913A
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German (de)
English (en)
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EP0406236A1 (fr
Inventor
Gerhard Klapettek
Siegfried Schneider
Bernd-Otto SCHÄFER
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
Wincor Nixdorf International GmbH
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    • 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
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/28—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning
    • G03G15/30—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning in which projection is formed on a drum
    • G03G15/305—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning in which projection is formed on a drum with special means to synchronize the scanning optic to the operation of other parts of the machine, e.g. photoreceptor, copy paper
    • 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
    • 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
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00371—General use over the entire feeding path
    • 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
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00603—Control of other part of the apparatus according to the state of copy medium feeding
    • 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
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00611—Detector details, e.g. optical detector

Definitions

  • the invention relates to a device for monitoring the position of sheet-shaped recording media with respect to a transport path in an electrophotographic printer according to the preamble of the main claim.
  • a device for monitoring the position of sheet-shaped recording media with respect to a transport path in an electrophotographic printer according to the preamble of the main claim is known from Patent Abstracts of Japan, Vol. 6, No. 88 (P-118) [966] dated May 26, 1982.
  • a recording device with a device for monitoring the position of sheet-like recording media is now in detail from the document Document Abstracts of Japan, Volume 6, No. 88 (P-118) (966) from May 26, 1982, cited at the beginning known with respect to a transport path, an essential part of this monitoring device is an optical sensor for detecting the front edge of a supplied recording medium.
  • This sensor is probably designed in such a way that it can also determine a certain lateral placement of the conveyed recording medium from a reference position. Delay times can thus be derived from the information content of the output signal, with which a control signal for triggering the start of printing is delayed compared to the time at which the sensor output signal occurs.
  • the known monitoring device is impressively simple, but should therefore only fulfill the monitoring function to a certain extent, which does not yet meet high demands on the print quality.
  • EP-A3-0 144 824 discloses a method and a device for maintaining a predetermined edge distance of the print on recording media in an electrophotographic printer, in which the start for the generation of a latent charge image on a charge storage drum as a function of the lateral placement of one to be printed recording medium is controlled with respect to a reference position in the transport path. For this purpose, the side edge of the conveyed recording medium is scanned before it enters the transfer printing station, and corresponding scanning signals are converted in a printer controller into a shift factor which defines the beginning of the line of the charge image on the charge storage drum.
  • This known monitoring device only relates to the determination of the lateral storage of a funded recording medium and says nothing about it from how the beginning of the line of the printed image is determined at a distance from the front edge of the recording medium.
  • an electrostatically operating copying machine in which an optical scanning unit for determining the presence of a funded record carrier and for determining the size of its lateral offset perpendicular to the direction of transport is provided. Furthermore, a comparator arrangement can optionally be provided, which is used to determine the actual transport speed of the conveyed recording medium. If this deviates from a specified transport speed, then the optical scanning of the original document to be copied is adjusted accordingly. To determine the actual transport speed, the rotating movement is monitored by alignment rollers which are operated by a pulse motor.
  • the number of motor pulses from the start of the rotation of the pair of rollers to the reaching of the optical scanning unit with the front edge of the conveyed recording medium is counted in order to measure an actual feeding interval. This measured value can be compared with a predetermined interval.
  • the sheet-shaped recording medium can be aligned substantially parallel to the direction of transport, in particular lateral trays, as explained, can only be further reduced with mechanical guides only with very complex constructions.
  • the invention is therefore based on the object of providing a device of the type mentioned at the outset which allows the transport of the sheet-shaped recording medium, in particular in the area of the transfer printing station of the electrophotographic printer, to be monitored with simple means and reliably in order to monitor the toner image on the sheet-shaped To transfer record carriers as true to format as possible.
  • the solution according to the invention is based on the fact that a certain alignment of the sheet-shaped recording medium with respect to the transport path is possible with the mechanical measures hitherto customary, that the tolerances still remaining, particularly in electrophotographic printers with high printing performance, are very difficult to narrow further using known measures .
  • the solution according to the invention therefore also assumes that a coarse alignment of the sheet-shaped recording medium parallel to the transport direction is entirely possible with relatively simple means, even if this is still not sufficient for the intended purpose. For this reason, additional measures are provided which, in spite of a not exactly exact alignment of the recording medium, enable the toner image to be re-printed onto the recording medium with a closely tolerated vertical and horizontal distance of the printed image from the front edge or a side reference edge of the sheet-shaped recording medium.
  • the front edge of the recording medium transported in the direction of the transfer printing station of the electrophotographic printer is detected with a light barrier located in the transport path when passing through a position which is precisely aligned with the geometry of the charge storage drum and the arrangement of a character generator for generating the latent charge image is.
  • the feed of the sheet-like recording medium can thus be precisely synchronized with the rotation of the charge storage drum, so that the front edge of the recording medium is already at a defined vertical distance from the transfer printing area when the first line of the toner image enters the transfer printing area.
  • an optical measuring device is provided in front of this light barrier that detects the leading edge, which measures the position of the lateral edge of an incoming sheet-shaped recording medium exactly and forwards this measured value to a printer controller.
  • known electrophotographic printers also have a relatively complex printer control, which in particular prepares the print information in such a way that it is available point-to-point synchronized in the character generator of the electrophotographic printer, it does not pose any particular difficulty to adapt the printer control so that it adjusts the lateral orientation of the printer corrected pressure information provided in the character generator using this measured value.
  • the invention therefore does not attempt, for example, to further improve the alignment of the sheet-like recording medium with respect to the direction of transport, which would be difficult to carry out for reasons of complexity.
  • the toner image to be re-printed is shifted along the surface lines of the charge storage drum in a tolerance range of a few millimeters in such a way that the lateral deposition of the recording medium caused by mechanical tolerances is corrected from a standard position.
  • the charge image to be re-printed is "aligned" in order to correct side deposits of the record carrier.
  • this can be achieved with simple means by means of a further light barrier which can be displaced transversely to the transport direction and whose linear displacement path is controlled by a stepper motor.
  • the transmitter and receiver are arranged opposite one another at the ends of a fork which can be moved transversely to the transport direction and which encompasses the side edge to be detected.
  • the direction of displacement of this light barrier is controlled so that it is moved from a zero position towards the side edge to be detected, whereby the incremental steps required to detect the side edge are counted. This number of steps is thus a measure of the lateral storage of the sheet-shaped recording medium which is just arriving.
  • This value is processed in binary coding in the printer controller in order to provide the print information in the character generator for the corresponding print page in an exactly horizontally aligned manner on the recording medium.
  • FIG. 1 shows schematically at 1 a transport path for sheet-shaped recording media 2 of an electrophotographic printer in the vicinity of a charge storage drum 3.
  • the charge storage drum 3 rotates clockwise, as indicated by an arrow 4, past a character generator 5, which transmits the pressure information line by line to the charge storage drum 3 in the form of point-controlled radiation energy.
  • the charge storage drum 3 passes through a transfer printing station 6, in which the charge image generated by the character generator 5 is transferred line by line to the recording medium 2 in the form of appropriately configured toner particles.
  • the electrophotographic principle is generally known, so that it does not have to be elaborated on here.
  • a number of light barriers 7 to 9 are arranged in front of the charge storage drum 3 in the course of the transport path 1, but the illustration in FIG. 1 is not to scale and only shows the principle.
  • the transport speed of the recording media 2 is necessarily identical to the peripheral speed of the charge storage drum 3.
  • the first of these light barriers which is referred to as vertical light barrier 7, lies at a distance a from the transfer printing station.
  • This distance a corresponds, as indicated in FIG. 1, to the handling of the circumference of the charge storage drum 3 between the transfer station 6 and the character generator 5.
  • the vertical light barrier thus has the task of determining the front edge of the record carrier 2 transported along the transport path 1, so that the start of printing in the transfer station can be controlled so that the first print line on the recording medium 2 lies exactly with a predetermined vertical distance from its front edge.
  • the second light barrier In front of the first light barrier 7 - viewed in the direction of transport - lies at a distance b the second light barrier, which is therefore referred to as horizontal light barrier 8, because although this light barrier also detects the passage of the front edge of a recording medium 2, it triggers a process that causes the horizontal The position of the recording medium 2 with respect to the transport path 1 is determined. This process is carried out with the aid of the third light barrier, which is designated as an edge light barrier 9 and detects the position of a side edge of the recording medium 2 with respect to the transport path 1.
  • FIG. 2 another view for the arrangement described with reference to FIG. 1 is shown schematically as a view from above.
  • the vertical light barrier 7 lies at a distance a therefrom, which - as described - is defined by the geometrical arrangement of the character generator 5 in relation to the transfer printing station 6.
  • This light barrier like the horizontal light barrier 8 adjacent at a distance b, lies in the middle of the transport path 1, in which an incoming recording medium 2 is shown schematically.
  • a double arrow 10 it is arranged to be able to be displaced transversely to the transport path in order to detect the side edge of the recording medium 2.
  • FIG 3 the mechanical arrangement for moving the edge light barrier 9 is shown schematically.
  • the edge light barrier 9 with its transmitting diode 90 and its receiving transistor 91 is arranged vertically to the transport path 1 below or above this transport path.
  • a slit diaphragm 92 is assigned to the light entry side of the receiving transistor 91.
  • This edge light barrier 9 is with its transmitting or receiving part fixed in a fork 11, which includes the transport path 1 on both sides.
  • the fork 11 is mechanically coupled to a stepper motor 12, which is designed such that it converts the incremental rotary movement into a linear movement with an internal gear so that the edge light barrier 9 can be displaced bidirectionally in the direction of the double arrow 10 transversely to the transport path 1.
  • a zero position detector 13 is provided for monitoring the linear movement of the edge light barrier 9. Its position in relation to the transport path 1 results from the basic function of the edge light barrier 9. To determine the current position of the side edge of the recording medium 2, the edge light barrier 9, controlled by the stepping motor 12, is first moved into the transport path 1 until it is one predetermined end position reached. This end position is selected such that the edge light barrier 9 then lies within the side edge 200 of the recording medium 2 to be detected in any case, even if the recording medium 2 is still permitted to be deposited laterally. This end position defined in this way is referred to as the zero position. Accordingly, a zero position detector 13 is arranged transversely to the transport path 1 in such a way that in this zero position it detects the edge of a flag 110 of the fork 11.
  • the edge light barrier 9 In order to determine the actual position of the side edge 200 of the recording medium 2 to be detected, the edge light barrier 9 is moved out of the transport path 1 incrementally. The edge light barrier 9 changes the signal state at its output at the moment the side edge overflows. The number of steps of the stepping motor 12, which are necessary from the zero position until the position of the side edge 200 is recognized, is thus a measure of the actual position of the side edge 200 with respect to the zero position. As will be explained, this measured value is fed to a controller 23 of the printer and processed there. in order to then supply the character generator 5 with printing information with a correspondingly adapted value for the horizontal start of the printing lines.
  • the step-by-step linear movement of the edge light barrier 9 or of the stepping motor 12 is expediently adapted to the raster width of the character generator 5. This will be explained using an example. Is the resolution of the character generator 5 z. B. 240 dpi (dots per inch), the raster width is the reciprocal of this number size.
  • the linear displacement path of the stepping motor 12 is expediently chosen to be just as large per step and accordingly, expressed in millimeters, is 0.158 mm. Under the assumed conditions, this value is essentially the absolute error of this mechanical optical measuring device.
  • the horizontal light barrier 8 determines the start of the measuring process explained above, then its distance from the vertical light barrier 7 must be at least so large that the measuring process described and the subsequent processing of the measured value into control signals for the character generator 5 can be carried out in the period of time that the front edge of the recording medium 2 needs to cover the distance b.
  • This distance b depends first of all on the transport speed v of the recording medium 2. This transport speed may be 0.2 m / s, for example.
  • a minimum time period t min must be set, which is required to transmit a determined measured value to the printer controller, to have it processed there and to provide the adapted print information in the character generator 5. For this period t min , for example, 50 ms are set.
  • the third influencing variable is the maximum time period for the course of the measuring process itself. It is influenced by the start / stop operating frequency of the stepping motor 12 and the number of maximum steps required in the direction of displacement 10. With the above assumptions, the distance b is then, for example, 35 mm and more.
  • the distance c of the horizontal light barrier 8 from the edge light barrier 9 is less determined by such functional boundary conditions and can be chosen relatively freely in terms of construction, for example 10 mm.
  • FIG. 4 shows schematically the light barriers 7, 8, 9 and 13 described above, the signal outputs VER, HOR, EDGE and POS0 ⁇ are fed in parallel to a programmable controller 14. This essentially generates the control signals for controlling the stepper motor 12. Stepper motor controls as such are known from a large number of applications. They are used so frequently that specific integrated circuits are also customary on the market. Two such circuits, a drive circuit 15 and a power driver circuit 16, in Commercially available as circuits L297 or L298 from SGS, are shown in FIG. 4 in a typical, conventionally customary configuration.
  • the control circuit 15 receives control signals generated by the programmable controller 14, an activation signal MOEN, a clock signal MOCLK and a direction signal MODIR.
  • the enable signal MOEN activates the control of the stepper motor 12.
  • the clock signal MOCLK triggers an incremental step of the stepper motor 12 with its rising edges.
  • the direction signal MODIR defines one of the possible directions of rotation of the stepping motor 12.
  • the two integrated circuits 15 and 16 are connected to one another in accordance with the known regulations of the circuit manufacturer, so that a detailed explanation does not appear to be necessary here.
  • a bridge circuit made up of eight diodes D1 to D8, via which windings 121 and 122 of the stepping motor 12 are selectively connected to the operating voltage (24 V) in order to trigger the stepping movements.
  • the zero position of the edge light barrier 9 represents the initial state. Therefore, the corresponding output signal POS0 ⁇ of the zero position detector 13 should set the measuring device in a defined initial state. This is illustrated in the block diagram of FIG. 4 so that in the programmable controller 14 a reset signal RES for the connected circuit is derived, for example, from the output signal POS0 ⁇ of the zero position detector 13 supplied to it.
  • the measuring process is started, ie the edge light barrier 9, controlled by the stepping motor 12, is moved out of the transport path 1.
  • a binary counter 17 can be used for this purpose, which is clock-controlled by the clock signal MOCLK. Now, however, only the steps of the stepping motor 12 are to be counted, which the edge light barrier 9 executes from the zero position up to the side edge 220 of the recording medium 2. Therefore, the binary counter is reset by the reset signal RES as soon as the zero position of the edge light barrier 9 is reached.
  • the binary counter 17 is activated as soon as the measuring process is triggered by the change in the state of the output signal HOR of the horizontal light barrier 8. This is illustrated in FIG. 4 in such a way that this output signal HOR is fed to the set input of an RS flip-flop 19 via a first inverter 18. This is set as soon as the front edge of a record carrier 2 is detected by the horizontal light barrier 8.
  • the output signal of the RS flip-flop 19 is fed to an AND gate 20, which also receives the enable signal MOEN at a further input.
  • a signal derived from the output signal EDGE of the edge light barrier 9 is fed to a third input of the AND gate 20 via a further inverter 21.
  • the AND gate switches the enable signal MOEN for the stepper motor 12 on the condition that the horizontal light barrier 8 has triggered the start of the measurement process and that, on the other hand, the edge light barrier 9 has not yet detected the side edge 200 of the record carrier.
  • the output signal of the AND gate 20 forms the enable signal EN for the binary counter 17.
  • the enable signal is applied to the binary counter 17, the positive edges of the clock signals MOCLK are added up in the binary counter.
  • the counter reading corresponds to the binary counter 17 the number of steps which the edge light barrier 9 has covered from the zero position until the side edge 200 of the recording medium 2 has been reached.
  • This value is transferred to an intermediate register 22 so that it can be transferred to the printer controller 23 regardless of the reset of the binary counter 17.
  • the printer control 23 supplies, as is known, bit by bit the print information for the character generator 5, which is converted there into individual optical signals corresponding to a raster point of a microprint line.
  • the exemplary embodiment described illustrates that it is entirely possible, using measures known per se and using conventional control principles in electrophotographic printers, to determine vertical and horizontal starting points for the start of printing on a recording medium with great accuracy even when the recording medium is transported along the Transport path results in vertical or horizontal tolerances.
  • the exemplary embodiment described here represents only one of several possible forms for realizing a reference scale for the printed image, which is determined again and again individually for the recording medium.
  • it is, for example, of only minor importance in what way the measuring process in individual expires.
  • the zero position is definitely always within the record carrier, so that the edge to be detected is always sought in a specific direction.
  • the zero position could, however, also be chosen to be identical to the nominal position of the side edge of the recording medium. The direction of displacement during the measuring process would then depend on the output signal of the edge light barrier at the beginning of the measuring process.
  • edge light barrier is already in the zero position when the front edge of the record carrier is detected by the horizontal light barrier.
  • the edge light barrier is already in the zero position when the front edge of the record carrier is detected by the horizontal light barrier.

Abstract

Tout en recourant à des moyens simples et en assurant un fonctionnement fiable, le transport de supports d'enregistrement en feuilles, en particulier dans la zone de transfert de la machine d'impression par électrophotographie, doit êtrte contrôlé avec précision, afin de transférer, avec le format le plus fidèle possible, l'image de la poudre "toner" sur lesdits supports d'enregistrement. A une distance déterminée (a) de la zone de transfert (6), il est prévu un capteur optique (7) destiné à détecter le bord avant d'un support d'enregistrement (2); par signal de sortie (VER) émis par ce capteur, le processus de déchargement et de transfert est synchronisable. Pour contrôler l'empilage latéral d'un support d'enregistrement, il est en outre prévu un dispositif de mesurage optique (9 à 13), qui se déplace transversalement pas à pas, à partir d'une position zéro en direction du parcours de transport (1) et qui détecte le bord latéral du support d'enregistrement. Le nombre de pas constitue une mesure pour l'empilage latéral du support d'enregistrement, mesure dont la grandeur sert à l'ajustement horizontal de l'image du toner au début d'une ligne, en ménageant une marge prédéterminée sur le bord latéral. Le dispositif de contrôle est utilisable en particulier pour une machine d'impression par électrophotographie lors du traitement de feuilles individuelles.

Claims (5)

  1. Dispositif pour contrôler la position de supports d'enregistrement en forme de feuilles (2) par rapport à une voie de transport (1) dans une imprimante électrophotographique comportant un tambour rotatif à accumulation de charges électriques (3), un poste de transfert (6) associé à ce tambour, ainsi que des moyens d'exploration optique (7 ou 9), disposés en amont du poste de transfert (6) dans la voie de transport, pour déterminer le bord avant ainsi que la position du bord latéral d'un support d'enregistrement arrivant et à l'aide du signal de sortie desquels l'opération d'inversion des charges et du transfert au niveau du tambour d'accumulation de charges est susceptible d'être synchronisée avec la position du bord latéral et le transport du support d'enregistrement, caractérisé par le fait que les moyens d'exploration optiques comprennent un premier capteur optique (7), dont la distance (a) par rapport au poste de transfert (6) correspond à la distance entre le poste de transfert et l'emplacement du générateur de caractères (5), de sorte qu'avec son signal de sortie (VER), le fonctionnement du générateur de caractères peut être synchronisé avec le transport du support d'enregistrement, que les moyens d'exploration optiques comprennent en outre un dispositif optique de mesure (9 à 13), qui est situé en amont du premier capteur optique (7) lorsqu'on regarde dans la direction de transport et qui, pour la détection d'un bord latéral (200) du support d'enregistrement, est agencé de manière à être déplaçable linéairement et transversalement par rapport à la voie de transport, à partir d'une position initiale définie et produit une valeur de mesure qui correspond au déplacement jusqu'à la détection du bord latéral, en vue du réglage horizontal de l'image de toner sur un début de ligne, à une distance horizontale prédéterminée du bord latéral détecté, et qu'entre le premier capteur optique (7) et le dispositif optique de mesure (9 à 13) est disposé, dans la voie de transport (1), un autre capteur optique (8), dont le signal de sortie (HOR) commande l'allure dans le temps de l'opération de mesure dans le dispositif de mesure et dont la distance par rapport au premier capteur optique (7) est choisie de telle sorte que la saisie et le traitement des valeurs de mesure sont, pour une vitesse prédéterminée du processus, interrompus avant que le bord avant du support d'enregistrement contrôlé (2) atteigne le premier capteur optique (7).
  2. Dispositif suivant la revendication 1, caractérisé par le fait que le dispositif de mesure optique (9-13) comporte une fourche (11) d'un relais photoélectrique (9) de détection du bord ainsi qu'un moteur pas-à-pas (12), qui sont accouplés entre eux mécaniquement pour réaliser un déplacement linéaire du relais photoélectrique selon des pas incrémentaux et qu'en outre il est prévu, en plus d'un dispositif (15,16,D1 à D8) de commande du moteur, un dispositif (14, 17 à 22) de détection des valeurs de mesure, qui fournit à l'unité de commande (23) de l'imprimante, associée à cette dernière, la valeur de mesure détectée qui correspond à un décalage latéral du support d'enregistrement (2), en vue du post traitement ultérieur.
  3. Dispositif suivant la revendication 2, caractérisé par le fait que le dispositif (14, 17 à 22) de détection des valeurs de mesure est agencé de manière à compter les pas, exécutés pendant le déplacement linéaire, du moteur pas-à-pas (12) depuis la position initiale jusqu'à la détection du bord latéral (200) du support d'enregistrement (2) et prépare sous forme codée en binaire la valeur sommée, en tant que grandeur de mesure.
  4. Dispositif suivant l'une des revendications 1 à 3, caractérisé par le fait que le dispositif de mesure (9 à 13) possède, en tant que détecteur de position de zéro, un autre capteur optique (13), qui détecte le retour du dispositif de mesure dans sa position initiale et délivre un signal de commande (POS0) correspondant pour arrêter le dispositif de mesure.
  5. Dispositif suivant l'une des revendications 2 à 4, caractérisé par le fait que le moteur pas-à-pas (12) du dispositif de mesure (9 à 13) est pourvu d'une transmission interne pour convertir le mouvement de rotation du moteur en un mouvement de course linéaire et est accouplé directement à la fourche (11) du relais photoélectrique (9) de détection du bord.
EP88904913A 1988-03-15 1988-06-09 Dispositif de controle du transport de supports d'enregistrement en feuilles dans une machine d'impression par electrophotographie Expired - Lifetime EP0406236B1 (fr)

Applications Claiming Priority (2)

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DE19883808620 DE3808620A1 (de) 1988-03-15 1988-03-15 Einrichtung zum ueberwachen des transports von blattfoermigen aufzeichnungstraegern in einem elektrofotografischen drucker
DE3808620 1988-03-15

Publications (2)

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EP0406236A1 EP0406236A1 (fr) 1991-01-09
EP0406236B1 true EP0406236B1 (fr) 1992-10-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88904913A Expired - Lifetime EP0406236B1 (fr) 1988-03-15 1988-06-09 Dispositif de controle du transport de supports d'enregistrement en feuilles dans une machine d'impression par electrophotographie

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EP (1) EP0406236B1 (fr)
DE (2) DE3808620A1 (fr)
WO (1) WO1989008871A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690792B1 (fr) * 1993-03-22 1996-10-09 Siemens Nixdorf Informationssysteme Aktiengesellschaft Dispositif de positionnement precis d'une tete d'impression par rapport a un support d'enregistrement
DE4309185C2 (de) * 1993-03-22 1995-08-24 Siemens Nixdorf Inf Syst Vorrichtung zur exakten Positionierung eines Druckkopfs zu einem Aufzeichnungsträger
JP3963534B2 (ja) * 1997-08-02 2007-08-22 株式会社リコー 画像形成装置
DE59910362D1 (de) 1998-12-04 2004-09-30 Oce Printing Systems Gmbh Elektrographische druckeinrichtung mit sensor für die schlupferkennung

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US4260241A (en) * 1978-05-17 1981-04-07 Canon Kabushiki Kaisha Copying apparatus
US4538905A (en) * 1983-12-05 1985-09-03 International Business Machines Corporation Electronic image registration
US4755855A (en) * 1985-05-30 1988-07-05 Kabushiki Kaisha Toshiba Image forming apparatus with a forming position correcting function
US4696564A (en) * 1985-07-11 1987-09-29 Kabushiki Kaisha Toshiba Image forming apparatus

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Patent Abstracts of Japan, vol. 11, No. 226 (P-598) (2673) 23 July 1987 & JP-A-6240469 (TOSHIBA CORP.) 21 February 1987. *
Patent Abstracts of Japan, vol. 6, No. 88 (P-118) (966) 26 May 1982 & JP-A-5723967 (CANON K.K.) 8 February 1982. *
Patent Abstracts of Japan, vol. 7, No. 152 (P-208) (1297) 5 July 1983 & JP-A-5863974 (HITACHI KOKI K.K.) 16 April 1983. *
Patent Abstracts of Japan, vol. 7, No. 67 (P-184) (1212) 19 March 1983 & JP-A-57210359 (RICOH K.K.) 23 December 1982. *
Patent Abstracts of Japan, vol. 9, No. 141 (P-364) (1864)15 June 1985 & JP-A-6021058 (FUJI XEROX K.K.) 2 February 1985. *

Also Published As

Publication number Publication date
EP0406236A1 (fr) 1991-01-09
DE3808620A1 (de) 1989-09-28
DE3875494D1 (de) 1992-11-26
WO1989008871A1 (fr) 1989-09-21

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