US20020130461A1 - Process and device for detecting the presence of an object, preferably a leaf sheet-shaped or sheet-shaped object for printing - Google Patents

Process and device for detecting the presence of an object, preferably a leaf sheet-shaped or sheet-shaped object for printing Download PDF

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Publication number
US20020130461A1
US20020130461A1 US10/079,466 US7946602A US2002130461A1 US 20020130461 A1 US20020130461 A1 US 20020130461A1 US 7946602 A US7946602 A US 7946602A US 2002130461 A1 US2002130461 A1 US 2002130461A1
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US
United States
Prior art keywords
sensor device
transport
transport path
clock
sheet
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.)
Abandoned
Application number
US10/079,466
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English (en)
Inventor
Ralph Petersen
Heiko Hunold
Patrick Metzler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20020130461A1 publication Critical patent/US20020130461A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B65H7/06—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 responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/08—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 responsive to presence of faulty articles or incorrect separation or feed responsive to incorrect front register
    • 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
    • B65H2511/10—Size; Dimensions
    • B65H2511/11—Length
    • 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
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • 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
    • 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
    • B65H2513/42—Route, path
    • 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
    • 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

Definitions

  • the invention involves a process and device for detecting the presence of an object, preferably a leaf sheet-shaped or sheet-shaped object on a transport path, especially for preparation and/or control of a processing of the object, preferably for printing the object in a printing machine, especially a digital printer, where the object is transported on the transport path past a sensor device, preferably a photoelectric barrier, for detection and registration of the front edge of the object in the transport direction.
  • a sensor device preferably a photoelectric barrier
  • the imaging operation for printing must be prepared for each sheet to be printed, because a permanent printing block or mold is not used (non-impact printing). That is, the printed image must be recreated for each sheet to be printed, even if the printed image does not change from sheet to sheet.
  • This imaging requires time so that the arrival of a new sheet must be announced at the proper time, so that time is available for the imaging and is planned for by the printer.
  • the announcement of a next sheet is done by a sensor device which detects the presence and/or the arrival of an object on the transport path in its measurement area.
  • This object can be the arriving sheet itself, which is detected by the sensor device as soon as its front edge enters the measurement area of the sensor device, but the object can also be a mark or the like, for example, which runs along with the conveyor belt and its presence is likewise detected by the sensor device as soon as the front edge enters the measurement area.
  • a one-way photoelectric barrier or a two-way photoelectric barrier, or a reflection photoelectric barrier come into consideration as the sensor device.
  • the sensor device should detect the entrance into its measurement area in as precise a manner as possible so that the measurement area of the sensor device, for example, through a narrow slit, is set to be as small as possible in order to, in this way, select the measurement inaccuracy that results from the extension of the measurement area itself, to be as small as possible.
  • a precise sensor device of this type is namely also subject to slight interference effects by phenomena in the measurement area, which mediate the appearance of an existing object. For example, slightly extended, local damages, such as scratches or soiling, can also readily trigger the sensor device and in this way lead to erroneous triggerings or erroneous switchings of the imaging device of an electrophotographic printer.
  • the purpose of the invention is thus to improve a process and/or a sensor device to the effect that in spite of high precision, the danger of erroneous detection is reduced.
  • This purpose is achieved in regard to the process in that after detecting the front edge of the object and/or its entrance into the measurement area, it is checked at least once to determine whether the object continues to be present in the measurement area of the sensor device.
  • the check is done multiply at defined intervals that can be relatively small, in that the sensor device operates by clock pulses.
  • the clock pulsing according to the invention can be time-referenced or path-referenced, whereby a timed frequent clock pulsing is allocated to corresponding path distances via another path measurement and can be converted into these path distances.
  • a timed clock pulsing can be implemented directly for the sensor device and is sufficient if the sensor device itself should make the decision about the presence of an object.
  • the clock pulsing is performed in a manner referenced to the path distance, the clock pulsing is only as uniform in time as the movement of the transport device used.
  • this has the advantage for the direct preparation control, e.g. of an electrophotographic printer, that transport speed fluctuations no longer falsify the measurement result.
  • the sensor device is clock-pulsed in a manner referenced to the path-distance or a time clock is otherwise set in relation to a path distance measurement, then a statement about the distance, for example, between the position of the sensor device and the print gap of the imaging device, can be made. This is especially true if, as provided according to a further embodiment, the position of the measurement area of the sensor device is defined and specified on the transport path with regard to a reference point. Also, as likewise preferably provided, the length of the object can be measured.
  • a minimum length of an object to be expected is preferably provided, which is checked.
  • the shortest format length that should ever be used is taken into account for this purpose, whereby the prescribed minimum length is selected to be this short or for the purposes of safety, shorter.
  • Each object that is shorter than the minimum length is considered to be a source of interference.
  • a device according to the invention is characterized in an independent solution of the inventive purpose, in that the sensor device is set up to check at least once whether the object is still present in its measurement area after the detection of the object.
  • the device according to the invention for multiple checking for the presence of an object can be operated in a clock pulsed manner, namely clock pulsed in a time-referenced or path-distance-referenced manner.
  • the sensor device and a measurement device are connected together for measurement of a transport distance via a computational unit and/or a signal output unit.
  • the position of the measurement area of the sensor device on the transport path of the objects is preferably defined and specified with regard to a reference point.
  • a transparent conveyor belt is chosen, on which the objects can be placed and that itself does not interfere with an optically operating sensor device, unless it were to be soiled or scratched, for example, or otherwise damaged.
  • FIG. 1 which schematically shows a section of a paper transport path of a printer with a first embodiment form of a device according to the invention, depicted in the manner of a block diagram, in a side view, and
  • FIG. 2 which schematically shows a second embodiment form according to FIG. 1, with an additional path measurement device.
  • FIG. 1 shows schematically in a side view and partially in the manner of a block diagram, a section of a transport path for the paper sheet to be printed by an electrophotographically operating printer having a sensor device for detecting a paper sheet on the transport path.
  • a transparent conveyor belt 1 is indicated, which runs along the transport path in the transport direction 2 .
  • a paper sheet 3 is shown on the conveyor belt 1 .
  • a sensor device is located above the conveyor belt 1 .
  • the sensor device includes a photoelectric barrier 4 in particular, which registers the entrance and/or the presence of a paper sheet 3 in its measurement area and/or measurement point 5 .
  • the photoelectric barrier 4 is connected via a computational unit and output unit 6 with a time output device 7 .
  • a counter of the computational and output unit 6 is incremented, so that the counting rate multiplied by the time interval of the clock pulses produces a measuring time period.
  • This measuring time period corresponds, taking into account the transport speed of the paper sheet 3 in the transport direction 2 , to a measuring distance 8 that the front edge of the paper sheet 3 passes through over the measuring time period, starting with the measuring point 5 .
  • This measuring distance 8 can have a defined minimum length, in order to ensure that a more expansive paper sheet 3 had actually been detected and that an interference or damage through a locally limited soiling or a scratch of the conveyor belt 1 is not present.
  • the measuring distance 8 can be selected to be somewhat shorter than the shortest expected paper sheet length of the paper sheet formats provided for use.
  • the printer (not shown in greater detail) can be prepared for the arrival of the paper sheet in the print gap.
  • the printing process especially the imaging, can then be adjusted exactly in time to the arrival of the paper sheet.
  • the position and/or the distance of the measuring point must be known as precisely as possible. This position is thus defined relative to a reference point 9 .
  • the measuring distance 8 In addition to the position and/or distance of the measurement point 5 from the print gap, the measuring distance 8 must be taken into account. This is because only after this measuring distance 8 has passed, the paper sheet 3 is definitely recognized and is announced, so that this path distance up to arrival at the print gap is no longer available, and must be considered as a delay of the reporting of the paper sheet 3 .
  • FIG. 2 a second embodiment example of a device according to the invention is shown in a diagram corresponding to FIG. 1.
  • the same structural elements are shown with the same reference indicators as shown in FIG. 1.
  • the time output device 7 of FIG. 1 has been replaced by a path measurement device 10 , so that the clock pulsing and/or inquiry repetition through the photoelectric barrier 4 can occur in a manner having equal path sections.
  • the measurement distance 8 is considered to be an already covered distance during the announcement of the paper sheet 3 .
  • the photoelectric barrier 4 can be set so precisely and sharply defined that the measurement area and/or measuring point 5 is extended only a few micrometers. Interference by local foreign bodies or damage of the conveyor belt and resultant erroneous triggerings of the printer are prevented by the verifications over the measuring distance 8 .

Landscapes

  • Controlling Sheets Or Webs (AREA)
  • Paper Feeding For Electrophotography (AREA)
US10/079,466 2001-03-17 2002-02-21 Process and device for detecting the presence of an object, preferably a leaf sheet-shaped or sheet-shaped object for printing Abandoned US20020130461A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10112946.7 2001-03-17
DE10112946A DE10112946A1 (de) 2001-03-17 2001-03-17 Verfahren und Vorrichtung zum Erkennen des Vorhandenseins eines Objektes, vorzugsweise eines blatt- oder bogenförmigen Objektes für eine Bedruckung

Publications (1)

Publication Number Publication Date
US20020130461A1 true US20020130461A1 (en) 2002-09-19

Family

ID=7677862

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/079,466 Abandoned US20020130461A1 (en) 2001-03-17 2002-02-21 Process and device for detecting the presence of an object, preferably a leaf sheet-shaped or sheet-shaped object for printing

Country Status (4)

Country Link
US (1) US20020130461A1 (de)
EP (1) EP1241120B1 (de)
JP (1) JP2002274698A (de)
DE (2) DE10112946A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030173735A1 (en) * 2002-03-12 2003-09-18 Naoki Hirako Apparatus and method for sheet transport control
GB2550857A (en) * 2016-05-25 2017-12-06 Linx Printing Tech Limited Printer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3033780A1 (de) * 1980-09-09 1982-04-22 Weitmann & Konrad GmbH & Co KG, 7022 Leinfelden-Echterdingen Verfahren und vorrichtung zum steuern der ankunft einzeln vorgeschobener bogen aus biegsamem material
JPS62211247A (ja) * 1986-03-11 1987-09-17 Toppan Printing Co Ltd 折不良検査装置
DE3730683A1 (de) * 1987-09-12 1989-03-23 Gremser Masch Franz Verfahren und vorrichtung zur kontrolle von gegenstaenden
DE19523879A1 (de) * 1995-06-30 1997-01-02 Heidelberger Druckmasch Ag Verfahren zur Steuerung einer Druckeinrichtung
CH693468A5 (de) * 1998-12-16 2003-08-15 Hera Rotterdam Bv Verfahren und Vorrichtung für die Detektion oder Lagebestimmung von Kanten.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030173735A1 (en) * 2002-03-12 2003-09-18 Naoki Hirako Apparatus and method for sheet transport control
US6758471B2 (en) * 2002-03-12 2004-07-06 Fuji Xerox Co., Ltd. Apparatus and method for sheet transport control
GB2550857A (en) * 2016-05-25 2017-12-06 Linx Printing Tech Limited Printer
CN109311331A (zh) * 2016-05-25 2019-02-05 领新印刷技术有限公司 用于在一系列对象上打印的打印机
GB2550857B (en) * 2016-05-25 2019-12-04 Linx Printing Tech Limited Printer
US10576735B2 (en) 2016-05-25 2020-03-03 Linx Printing Technologies Ltd. Printer for printing onto a succession of objects

Also Published As

Publication number Publication date
EP1241120A2 (de) 2002-09-18
EP1241120B1 (de) 2007-06-27
JP2002274698A (ja) 2002-09-25
DE50112661D1 (de) 2007-08-09
EP1241120A3 (de) 2004-02-04
DE10112946A1 (de) 2002-09-26

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