EP0763784B1 - Procédé de détection de partie terminale d'un papier d'enregistrement dans un appareil d'enregistrement et appareil de détection pour une partie terminale - Google Patents

Procédé de détection de partie terminale d'un papier d'enregistrement dans un appareil d'enregistrement et appareil de détection pour une partie terminale Download PDF

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Publication number
EP0763784B1
EP0763784B1 EP96306667A EP96306667A EP0763784B1 EP 0763784 B1 EP0763784 B1 EP 0763784B1 EP 96306667 A EP96306667 A EP 96306667A EP 96306667 A EP96306667 A EP 96306667A EP 0763784 B1 EP0763784 B1 EP 0763784B1
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EP
European Patent Office
Prior art keywords
recording
light
paper
recording media
recording paper
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
EP96306667A
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German (de)
English (en)
Other versions
EP0763784A3 (fr
EP0763784A2 (fr
Inventor
Naoto Yamaguchi
Hiroshi Ishida
Masayuki Kumazaki
Kazuhiko Yamaguchi
Yukihiro Uchiyama
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Seiko Epson Corp
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Seiko Epson Corp
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Publication date
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Publication of EP0763784A2 publication Critical patent/EP0763784A2/fr
Publication of EP0763784A3 publication Critical patent/EP0763784A3/fr
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Publication of EP0763784B1 publication Critical patent/EP0763784B1/fr
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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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/14—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors by photoelectric feelers or detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/514—Particular portion of element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B65H2513/41—Direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing
    • B65H2513/512—Starting; Stopping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/60—Optical characteristics, e.g. colour, light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/70—Electrical or magnetic properties, e.g. electric power or current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B65H2553/414—Photoelectric detectors involving receptor receiving light reflected by a reflecting surface and emitted by a separate emitter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/20—Calculating means; Controlling methods
    • B65H2557/23—Recording or storing data
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/20—Calculating means; Controlling methods
    • B65H2557/24—Calculating methods; Mathematic models
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/13—Parts concerned of the handled material
    • B65H2701/131—Edges
    • B65H2701/1311—Edges leading edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/13—Parts concerned of the handled material
    • B65H2701/131—Edges
    • B65H2701/1313—Edges trailing edge
    • 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
    • G03G2215/00616—Optical detector
    • 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
    • G03G2215/00717—Detection of physical properties
    • G03G2215/00721—Detection of physical properties of sheet position

Definitions

  • the invention relates to technology for detecting a leading edge and a trailing edge of a recording paper, suitable for use in a recording apparatus such as a serial recording apparatus wherein a recording head is moved in the direction of a width of a recording paper and printing is carried out, and a page recording apparatus transferring a toner image formed on a photoconductive drum to a recording paper.
  • a recording apparatus such as a serial recording apparatus wherein a recording head is moved in the direction of a width of a recording paper and printing is carried out, and a page recording apparatus transferring a toner image formed on a photoconductive drum to a recording paper.
  • a recording apparatus detects the leading edge of a recording paper loaded from a paper supply port, sets the position of the recording paper leading edge at a constant position with respect to a recording line, carries out what is known as an initial printing position alignment operation and furthermore, if necessary, detects a trailing edge of the recording paper and carries out an operation to stop recording.
  • Detection of the leading and trailing edges of a recording paper is carried out by a switch disposed within the paper feed path which switches on by abutting with the recording paper and switches off by breaking contact with the end portion of the recording paper.
  • a sheet end detector comprising a light-emitting element irradiating a recording paper with light and a light-receiving element receiving reflected light from a recording paper is disposed in a position where it is possible to intercept light reflected from a recording paper, and the level of a signal from the sheet end detector is compared with a previously set standard level.
  • the light beam S1 of the light-emitting element which forms the sheet end detector has a slight spread, and in the same way the interception area S5 of the light-receiving element also has a slight spread, when recording paper P moves towards a printing region as shown by the arrow in the drawing, the amount of light reflected by the recording paper changes, and the signal level shown in FIG. 6(b); that is, the detector voltage, changes in proportion to the paper feed amount.
  • the rate of change of the detector voltage that is, the slope
  • Vm1 and Vm2 for the recording papers A and B respectively, decided by the respective recording paper reflectance ratio
  • GB 2220742A relates to the detection of the presence of a recording medium in a printer.
  • a method for detecting an end portion in a recording apparatus wherein, regardless of the characteristics of the paper; and moreover without the necessity for a high level of uniformity in a light-emitting element and a light-receiving element which compose a sheet end detector, it is possible to detect an end portion of a recording paper with a high level of accuracy.
  • Another objective of this invention is to provide a recording paper end portion detection apparatus for implementing the above mentioned method.
  • this invention provides a method for detecting a recording media end portion in a recording apparatus, wherein a recording media is irradiated with light and the position of an end portion is detected based on an amount of reflected light from said recording media, the method comprising the steps of:
  • this invention provides an end portion detection apparatus in a recording apparatus, comprising:
  • the invention consists of a method of detecting a recording paper end portion in a recording apparatus, wherein a recording paper is irradiated with light and the position of an end portion is detected based on an amount of reflected light from said recording paper, comprising the steps of: a process for recording the amount of reflected light from a recording paper guide means; a process for advancing a recording sheet, detecting the amount of reflected light of said sheet and calculating the difference between that amount of reflected light and the amount of light reflected from said media guide means; a process of setting a standard level by multiplying a value C which is greater than 0 and less than 1 by said difference; a process of pulling said recording paper back in a downstream direction to a position where it is possible to detect the amount of light reflected only by said recording paper guide means; and a process of feeding said recording paper in advance and determining that a leading edge of said paper has reached a standard position at a point in time when the amount of reflected light equals said standard
  • the paper feed amount necessary for the amount of reflected light only from a recording paper guide means to reach the amount of reflected light only from a recording paper is constant regardless of the characteristics of the paper, the amount of the difference between the amounts of reflected light of the recording paper guide means and recording paper is constant, and the standard level obtained when this amount of difference is multiplied by a factor C is also constant, the relative position of a recording paper end portion with respect to the sheet end detector at the time when the amount of light has changed up to the standard level is also constant.
  • FIG. 1 (a) and (b) are respectively drawings showing a serial recording apparatus to which the sheet end detection technology of the present invention is applicable, and the construction of the vicinity of a carriage thereof.
  • FIG. 2 is a block diagram showing one embodiment of a sheet end detection apparatus in the above-mentioned apparatus.
  • FIG. 3 (a) and (b) are respectively drawings showing the recognition operation of the position of a leading edge of a recording paper in the above-mentioned apparatus when the amount of reflected light from a recording paper guide means is less than that of a recording paper, and when it is higher than that of a recording paper.
  • FIG. 4 is a flow chart showing mainly the recognition operation of a recording paper leading edge and trailing edge in the above-mentioned apparatus.
  • FIG. 5(a) and (b) are respectively drawings showing the recognition operation in the above-mentioned apparatus of the position of the leading edges of recording paper and the trailing edges of recording paper when the amount of light reflected from each paper is different in the case where the amount of reflected light from a recording paper guide means is less than that of a recording paper, and where it is higher than that of a recording paper.
  • FIG. 6 (a) and (b) are respectively drawings showing the detection area of the sheet end detector and errors which occur when recording papers with a different amount of reflected light are aligned for printing.
  • FIG. 1(a) is a drawing showing an embodiment of the present invention
  • reference numeral 1 in the drawing is a carriage mounted with a recording head 2 (such as an impact wire type recording head, an ink jet type recording head or a thermal transfer type recording head) driven by a drive motor 5 via a timing belt 7 bridging idling rollers 6, and moving reciprocally along a guide 4 forming a recording head guide means disposed parallel to the axis of a paper feed roller 3.
  • a recording head 2 such as an impact wire type recording head, an ink jet type recording head or a thermal transfer type recording head
  • a sheet end detector 10 is disposed in a position spaced at a constant distance from the recording head 2 basic position.
  • This sheet end detector 10 comprises a light-emitting element 11 irradiating paper feed roller 3, and a light-receiving element 12 disposed in a position where it is possible to intercept reflected light from paper feed roller 3 or a recording paper.
  • reference numeral 13 shows a paper holder guiding a printing surface of a recording paper.
  • FIG. 2 is a drawing showing the sheet end detection apparatus which is a characteristic of the present invention
  • reference numeral 20 is a platen voltage detection means, detecting an amount of light in the condition before a recording paper is loaded, that is, the amount of reflected light from paper feed roller 3 forming a recording paper guide means, as the voltage (hereinafter referred to as platen voltage Vp) from a light-receiving element 12 composing sheet end detector 10.
  • Reference numeral 21 is a recording paper saturation voltage detection means, detecting an amount of light reflected by a recording paper itself as the voltage (hereinafter referred to as paper saturation voltage Vm) from a light-receiving element 12 comprising sheet end detector 10.
  • the platen voltage Vp and paper saturation voltage Vm detected by these means 20 and 21 are respectively memorised in platen voltage memorising means 22 and paper saturation voltage memorising means 23.
  • a standard level calculating means calculating [(Vm - Vp) x C] +Vp or [(Vp - Vm) x C] + Vm using the difference between platen voltage Vp and paper saturation voltage Vm memorized in platen voltage memorizing means 22 and paper saturation voltage memorizing means 23, and a positive value C, greater than 0 and less than 1, for example 0.3; and producing therefrom a standard determination level Vs for determining if a leading edge and also a trailing edge of a recording paper have reached a specified position.
  • One of these two calculations is selected in dependence on whether Vp or Vm is larger. The calculation for which the value of the term in square brackets is positive is selected.
  • comparing means outputting a signal when a signal from sheet end detector 10 corresponds to the standard determination level Vs, detecting that either the leading edge or the trailing edge of a recording paper has reached a prescribed position.
  • Vs standard determination level
  • it is constructed to output a signal which is output after a recording paper is loaded as a forward paper feed halt signal to a paper feed control means 26, described later.
  • 26 is the previously mentioned paper feed control means; as shown in the flow chart described later, it controls the paper feed motor 8, driving it forwardly and in reverse in order to feed a recording paper, it stops feeding of the recording paper at the point in time when a forward paper feed halt signal is input from comparing means 25, and sets the recording paper at a prescribed position in order to commence printing.
  • FIG. 3 (a) shows the changes in a signal from a sheet end detector when a recording paper guide means is constructed from a material such as rubber which has a reflectance ratio lower than that of a recording paper
  • FIG. 3 (b) shows the changes in a signal from a sheet end detector when a recording paper guide means is constructed from a base of metal or the like which has a reflectance ratio higher than that of a recording paper, and paper feeding is carried out by a roller disposed in another location.
  • the values in the case of FIG. 3(b) are denoted by apostrophes.
  • Step A when a power source is switched on (Step A), the presence or absence of a recording paper is detected by the sheet end detector and other paper detectors (Step B), and if a recording paper is present, paper feed roller 3 is rotated and the paper is discharged (Step C).
  • platen voltage memorizing means 22 As platen voltage Vp or Vp' (Step D).
  • Step E a recording paper is loaded (Step E), and paper feed control means rotates paper feed motor 8 in a forward direction and the recording paper is fed forwardly (Step F).
  • paper feed control means rotates paper feed motor 8 in a forward direction and the recording paper is fed forwardly (Step F).
  • the leading edge of the recording paper reaches the vicinity of sheet end detector 10 due to the feeding, as light from light-emitting element 11 is reflected from paper feed roller 3 and the recording paper, the amount of light admitted to light receiving element 12 changes at a rate of change governed by the reflectance ratio of the recording paper.
  • the voltage of the signal from sheet end detector 10 gradually changes according to the differences in the reflectance ratios of the recording paper guide means and the recording paper. That is, when the reflectance ratio of the recording paper guide means is lower than that of the recording paper the voltage gradually increases, and when the reflectance ratio of the recording paper guide means is higher, it gradually decreases.
  • the signal from the sheet end detector reaches the level of an amount of light governed by the reflectance ratio of the recording paper, that is a saturation amount of light.
  • paper saturation voltage detector 21 detects this paper saturation voltage Vm or Vm' and memorizes it in paper saturation voltage memorizing means 23 (Step H).
  • Step I Meter paper saturation voltage Vm or Vm' is detected and memorized
  • paper feed control means 26 rotates paper feed motor 8 in reverse, feeds the recording paper in a reverse direction (Step I), and pauses the leading edge of the recording paper outside the detection region of sheet end detector 10.
  • Step J light from the light-emitting element 11 of sheet end detector 10 irradiates paper feed roller 3 only, and in the stage where the platen voltage is detected again by platen voltage detection means 20 (Step J) the recording paper is fed in reverse by a predetermined number of pulses only (Step K). Otherwise, Step I is repeated.
  • paper feed control means 26 rotates paper feed motor 8 forwardly and feeds the recording paper forward towards recording head 2 (Step L).
  • the amount of light from the light-emitting element 11 of sheet end detector 10 admitted to the light-receiving element 12 corresponds to the reflectance ratios of the recording paper guide means and recording paper, and changes in proportion to the amount of paper feeding.
  • Comparing means 25 compares the signal from sheet end detector 10 and the relevant recording paper determination standard Vs and Vs' calculated by standard level calculation means 24 (Step M), at the point in time when the amount of reflected light corresponds to standard values Vs or Vs', it is identified that the leading edge of the recording paper Ns has reached a standard position Nt (Step N), and furthermore, paper feed control means 26 halts the paper feeding operation and positions the leading edge of the recording paper Ns at prescribed position Nt (Step O).
  • the values of the amount of light in the condition where the light from light-emitting element 11 of sheet end detector 10 is reflected only from the recording paper that is, paper saturation voltage Vm1, Vm2 or Vm1', Vm2'
  • the values of the amount of light in the condition where the light from light-emitting element 11 of sheet end detector 10 is reflected only from the paper feed roller 3, that is, platen voltage Vp or Vp' become fixed at characteristic values decided by the reflectance ratio of the paper feed roller.
  • each difference between the recording paper and paper feed roller 3: (Vm1 - Vp) and Vm2 - Vp), or (Vp' - Vm1') and (Vp' - Vm2') is determined principally by the reflectance ratio of each recording paper loaded at the time of printing.
  • the paper feeding amount required for the amount of light reflected only from paper feed roller 3 to change only differences (Vm1 - Vp) and (Vm2 - Vp), or (Vp' - Vm1') and (Vp' - Vm2') is principally determined by the optical coefficients of light-emitting element 11 and light-receiving element 12 constructing sheet end detector 10, that is, the diameter of the light-emitting element beam and the area of possible reception of the light-receiving element.
  • Vsa [(Vm1 - Vp) x C] + Vp
  • Vsb [(Vm2 - Vp) x C] +Vp
  • Vsa' [(Vp' - Vm1') x C] +Vm1'
  • Vsb' [(Vp' - Vm2') x C] + Vm2' (obtained from multiplying these differences (Vm1 - Vp) and (Vm2 - Vp), or (Vp' - Vm1) and (Vp' - Vm2') by a constant ratio and adding the respective lower value Vp, Vm1' or Vm2') are output from sheet end detector 10, the relative position Nt of the leading edge of the recording paper with respect to sheet end detector 10 becomes constant regardless of the characteristics of the recording paper. This relative position Nt is constant for a given value of C and can be altered by selecting a different value of C.
  • a print command is input (Step P), printing is commenced (Step Q), printing continues up to the vicinity of the trailing edge of the recording paper, and as the recording paper begins to move away from sheet end detector 10, the amount of light admitted to sheet end detector 10 is governed by the paper feed roller 3 reflectance ratio, and is governed by the ratio of the areas of paper feed roller 3 and the sheet of paper within the detection area of leading edge detector 11, and the signal from sheet end detector 10 gradually changes.
  • Comparing means 25 compares the signal from sheet end detector 10 and the standard level [(Vm1 - Vp) x C] +Vp, [(Vm2 - Vp) x C] +Vp or [(Vp' - Vm1') x C] +Vm1', [(Vp' - Vm2') x C] + Vm2' (Step R), and when they correspond, it identifies that the trailing edge Ne of the recording paper has reached standard position Nb (Step S).
  • Step S standard position
  • the values of the amount of light in the condition where the light from light-emitting element 11 of sheet end detector 10 is reflected only from the recording paper that is, paper saturation voltage Vm1 and Vm2, or Vm1' and Vm2'
  • the values of the amount of light in the condition where the light from light-emitting element 11 of sheet end detector 10 is reflected only from the paper feed roller 3 that is, platen voltage Vp and Vp', become fixed at characteristic values decided by the reflectance ratio of the paper feed roller.
  • each difference between the recording paper and paper feed roller 3: (Vm1 - Vp) and (Vm2 - Vp), or (Vp' - Vm1') and (Vp' - Vm2') is determined principally by the reflectance ratio of each recording paper loaded at the time of printing.
  • the paper feeding amount required for the amount of light reflected only from the recording paper to change only differences [(Vm1 - Vp) x C] +Vp and [(Vm2 - Vp) x C] +Vp, or [(Vp' - Vm1') x C] +Vm1' and [(Vp' - Vm2') x C] +Vm2' is principally determined by the optical coefficients of light-emitting element 11 and light-receiving element 12 constructing sheet end detector 10, that is, the diameter of the light-emitting element beam and the area of possible reception of the light-receiving element.
  • the leading edge and trailing edge of a recording paper are detected by the same detector, but if a second sheet end detector having the same construction for detecting a trailing edge is disposed in a position suitable for detecting the trailing edge, even if the amount of light detected by this second sheet end detector is compared to a standard level determined when printing first commences, if there is at least no influence due to changes in the nature of the paper, the same position can be detected as the trailing edge.
  • the present invention comprises a process for recording the amount of reflected light from a recording paper guide means; a process for advancing a recording sheet, detecting the amount of reflected light of said sheet and calculating the difference between that amount of reflected light and the amount of light reflected from said media guide means; a process of setting a standard level by multiplying a value C which is greater than 0 and less than 1 by said difference; a process of pulling said recording paper back in an upstream direction to a position where it is possible to detect the amount of light reflected only by said recording paper guide means; and a process of advancing said recording paper and determining that a leading edge of said paper has reached a standard position at a point in time when the amount of reflected light equals said standard level; wherein the leading edge and trailing edge of a recording paper can be identified at a high level of accuracy regardless of the nature of the recording paper and the detection region and sensitivity of the sheet end detector, and the standard for components making up the sheet end detector can be relaxed, and the cost can be reduced.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Handling Of Sheets (AREA)
  • Controlling Sheets Or Webs (AREA)

Claims (10)

  1. Procédé pour détecter une partie d'extrémité d'un support d'enregistrement dans un appareil d'enregistrement, dans lequel le support d'enregistrement est irradié avec de la lumière et la position d'une partie d'extrémité est détectée sur la base d'une quantité de lumière réfléchie provenant dudit support d'enregistrement, le procédé comprenant les étapes consistant à :
    mémoriser la quantité de lumière réfléchie provenant d'un moyen de guidage de support d'enregistrement (3) ; avancer vers l'avant un support d'enregistrement, détecter la quantité de lumière réfléchie dudit support et calculer la différence entre cette quantité de lumière réfléchie et la quantité de lumière réfléchie depuis le moyen de guidage de support ; et
    établir un niveau standard, caractérisé par
    l'étape consistant à établir un niveau standard incluant la multiplication de ladite différence par une valeur C qui est plus grande que zéro et plus petite que 1 ;
    tirer ledit support d'enregistrement en arrière dans une direction en amont à une position où il n'est possible de détecter la quantité de lumière réfléchie que par ledit moyen de guidage de support d'enregistrement ; et
    avancer ledit support d'enregistrement et déterminer qu'un bord avant dudit papier a atteint une position standard au moment où la quantité de lumière réfléchie est égale audit niveau standard.
  2. Procédé pour détecter une partie d'extrémité d'un support d'enregistrement dans un appareil d'enregistrement selon la revendication 1, comprenant en outre :
       un traitement dans lequel pendant le processus de transport dudit support d'enregistrement, un second moment où ladite quantité de lumière réfléchie correspond de nouveau audit niveau standard est déterminé comme étant représentatif de la présence d'un bord arrière d'un support d'enregistrement.
  3. Procédé pour détecter une partie d'extrémité d'un support d'enregistrement dans un appareil d'enregistrement selon la revendication 1, comprenant en outre l'étape consistant à :
    sélectionner une valeur C d'une manière telle qu'un niveau standard peut être établi entre le rapport de pouvoir de réflexion dudit moyen de guidage de support d'enregistrement et le rapport de pouvoir de réflexion d'un support d'enregistrement plus proche du rapport de pouvoir de réflexion dudit moyen de guidage de support d'enregistrement.
  4. Appareil de détection de partie d'extrémité dans un appareil d'enregistrement, comprenant :
    un détecteur d'extrémité de feuilles (10) comprenant un élément à émission de lumière (11) et un élément récepteur de lumière (12), détectant des changements de quantité de lumière associés au déplacement d'un support d'enregistrement ;
    un moyen de calcul de valeur standard (24) qui détecte une quantité de différence (Vm - Vp) ou (Vp - Vm) entre ladite tension de cylindre du détecteur d'extrémité de feuilles Vp résultant de la lumière réfléchie depuis un moyen de guidage de support d'enregistrement (3) et ladite tension de saturation du support du détecteur d'extrémité de feuilles V m résultant de la lumière réfléchie depuis un support d'enregistrement, et calcule une valeur standard ; et
    un moyen de commande d'avancée de papier (26) pour avancer un support d'enregistrement, caractérisé par
    ladite valeur standard (Vm - Vp) x C ou (Vp - Vm) x C qui est calculée en multipliant par un coefficient constant C, où C est une valeur numérique plus grande que zéro et plus petite que 1 ;
    un moyen de comparaison (25) pour comparer ladite valeur standard et un signal provenant du détecteur d'extrémité de feuilles et pour reconnaítre un moment où ledit signal correspond à ladite valeur standard comme étant indicatif de la présence d'un bord avant ou d'un bord arrière d'un support d'enregistrement ; et
    ledit moyen de commande d'avancée de papier (26) qui est utilisé pour avancer un support d'enregistrement avant de commencer l'impression à une position où il est possible de détecter ladite tension de saturation de papier d'enregistrement, pour tirer ensuite le support enregistrement en arrière dans une direction en amont à une position où il est possible de détecter ladite tension du cylindre, et pour avancer finalement ledit support d'enregistrement où un bord arrière dudit support d'enregistrement est identifié par ledit moyen de comparaison.
  5. Appareil de détection de partie d'extrémité selon la revendication 4, dans lequel :
       lorsque la tension du cylindre du détecteur d'extrémité de feuilles Vp est plus grande que la tension de saturation du support du détecteur d'extrémité de feuilles Vm, ladite valeur standard est [(Vp - Vm) x C] + Vm ; et lorsque la tension de saturation de support du détecteur d'extrémité de feuilles Vm est plus grande que la tension du cylindre du détecteur d'extrémité de feuilles Vp, ladite valeur standard est [(Vm - Vp) x C] + Vp.
  6. Appareil de détection de partie d'extrémité dans un appareil d'enregistrement selon la revendication 4 ou la revendication 5, dans lequel :
       ledit moyen de comparaison sort un signal à un moment pendant le traitement d'impression lorsqu'un signal provenant du détecteur d'extrémité de support correspond à ladite valeur standard.
  7. Appareil de détection de partie d'extrémité dans un appareil d'enregistrement selon l'une quelconque des revendications 4 à 6, dans lequel :
       une valeur C est sélectionnée d'une manière telle qu'un niveau standard peut être établi entre le rapport de pouvoir de réflexion dudit moyen de guidage de papier d'enregistrement et un rapport de pouvoir de réflexion d'un papier d'enregistrement le plus proche du rapport de pouvoir de réflexion dudit moyen de guidage de papier d'enregistrement.
  8. Appareil de détection de partie d'extrémité dans un appareil d'enregistrement selon l'une quelconque des revendications 4 à 7, dans lequel :
       ledit moyen de commande d'avancée de papier arrête une opération d'avancée de papier en réponse à un premier signal provenant dudit moyen de comparaison.
  9. Appareil de détection de partie d'extrémité dans un appareil d'enregistrement selon l'une quelconque des revendications 4 à 8, dans lequel :
       ledit moyen de commande d'avancée de papier avance un papier d'enregistrement avant de commencer l'impression à une position où il est possible de détecter ladite tension de saturation du papier d'enregistrement, tire ensuite ledit papier d'enregistrement en arrière vers un côté en aval par une autre quantité constante au-delà de la position où il est possible de détecter ladite tension du cylindre, et finalement avance ledit papier d'enregistrement à un endroit où un bord avant dudit papier d'enregistrement est identifié par ledit moyen de comparaison.
  10. Appareil de détection de partie d'extrémité dans un appareil d'enregistrement selon l'une quelconque des revendications 4 à 9, dans lequel :
       ledit détecteur d'extrémité de feuilles est disposé d'une manière telle qu'un élément émetteur de lumière et un élément récepteur de lumière sont optiquement opposés par ledit moyen de guidage de papier d'enregistrement.
EP96306667A 1995-09-13 1996-09-13 Procédé de détection de partie terminale d'un papier d'enregistrement dans un appareil d'enregistrement et appareil de détection pour une partie terminale Expired - Lifetime EP0763784B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP260689/95 1995-09-13
JP26068995 1995-09-13
JP26068995 1995-09-13
JP22933596A JP3395822B2 (ja) 1995-09-13 1996-08-12 記録装置における記録用紙の端部検出方法、及び端部検出装置
JP229335/96 1996-08-12
JP22933596 1996-08-12

Publications (3)

Publication Number Publication Date
EP0763784A2 EP0763784A2 (fr) 1997-03-19
EP0763784A3 EP0763784A3 (fr) 1997-06-04
EP0763784B1 true EP0763784B1 (fr) 2001-11-21

Family

ID=26528752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96306667A Expired - Lifetime EP0763784B1 (fr) 1995-09-13 1996-09-13 Procédé de détection de partie terminale d'un papier d'enregistrement dans un appareil d'enregistrement et appareil de détection pour une partie terminale

Country Status (3)

Country Link
EP (1) EP0763784B1 (fr)
JP (1) JP3395822B2 (fr)
DE (1) DE69617146T2 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US8602516B2 (en) 2010-10-18 2013-12-10 Riso Kagaku Corporation Image recording device and method for controlling image recording device

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Publication number Priority date Publication date Assignee Title
KR100338745B1 (ko) * 1998-10-29 2002-07-18 윤종용 인쇄기
JP4217340B2 (ja) * 1999-04-15 2009-01-28 キヤノン株式会社 シート材検出装置及びシート材搬送装置及び画像形成装置
WO2001015908A1 (fr) * 1999-08-31 2001-03-08 Copyer Co., Ltd. Procede et dispositif de detection de matiere et imprimante associee
US7101096B2 (en) 2000-09-25 2006-09-05 Seiko Epson Corporation Tray for transferring recording media, and recording apparatus
JP4525933B2 (ja) * 2006-10-13 2010-08-18 セイコーエプソン株式会社 インクジェット式記録装置

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AU5620080A (en) * 1979-03-07 1980-10-30 Vydec Inc. Determining position of paper in typewriter
JPS5625488A (en) * 1979-08-09 1981-03-11 Canon Inc Printer
DE2951934C2 (de) * 1979-12-21 1982-08-19 Siemens AG, 1000 Berlin und 8000 München Vorrichtung für Schreibmaschinen o.dgl. zum Bestimmen der seitlichen Ränder des Aufzeichnungsträgers
JPS63112185A (ja) * 1986-10-30 1988-05-17 Brother Ind Ltd 印字装置
JPH01320175A (ja) * 1988-06-22 1989-12-26 Brother Ind Ltd プリンタににおける用紙有無検出装置
JP2866236B2 (ja) * 1991-10-29 1999-03-08 沖電気工業株式会社 印字用紙検出回路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8602516B2 (en) 2010-10-18 2013-12-10 Riso Kagaku Corporation Image recording device and method for controlling image recording device

Also Published As

Publication number Publication date
JP3395822B2 (ja) 2003-04-14
DE69617146T2 (de) 2002-04-18
JPH09136741A (ja) 1997-05-27
EP0763784A3 (fr) 1997-06-04
DE69617146D1 (de) 2002-01-03
EP0763784A2 (fr) 1997-03-19

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