EP1661836A1 - Bogenausgabesystem - Google Patents

Bogenausgabesystem Download PDF

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Publication number
EP1661836A1
EP1661836A1 EP04106081A EP04106081A EP1661836A1 EP 1661836 A1 EP1661836 A1 EP 1661836A1 EP 04106081 A EP04106081 A EP 04106081A EP 04106081 A EP04106081 A EP 04106081A EP 1661836 A1 EP1661836 A1 EP 1661836A1
Authority
EP
European Patent Office
Prior art keywords
discharge
sheet
tray
light barrier
sheets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04106081A
Other languages
English (en)
French (fr)
Inventor
Ferdinand M.H.F. Hooghiemstra
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 Netherlands BV
Original Assignee
Oce Technologies BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP04106081A priority Critical patent/EP1661836A1/de
Publication of EP1661836A1 publication Critical patent/EP1661836A1/de
Withdrawn legal-status Critical Current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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/12—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers
    • B65H29/14—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers and introducing into a pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/02—Pile receivers with stationary end support against which pile accumulates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
    • B65H43/06—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable detecting, or responding to, completion of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/421—Forming a pile
    • B65H2301/4212—Forming a pile of articles substantially horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11—Parts and details thereof
    • B65H2405/111—Bottom
    • B65H2405/1115—Bottom with surface inclined, e.g. in width-wise direction
    • B65H2405/11151—Bottom with surface inclined, e.g. in width-wise direction with surface inclined upwardly in transport direction
    • 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
    • B65H2553/412—Photoelectric detectors in barrier arrangements, i.e. emitter facing a receptor 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
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/12—Single-function printing machines, typically table-top machines

Definitions

  • the invention relates to a discharge system for printed media sheets, comprising: a tray having a surface for supporting the media sheets; and transport elements adapted to discharge the sheets onto the tray through a discharge nip.
  • a tray-full sensor is also required and is, for example, of a similar design comprising an arm that is pivotably mounted above the tray. The arm rests on top of the stack of sheets that is collected on the tray and is pivoted with increasing height of the stack.
  • the light-weight movable parts of the discharge sensor and the tray-full sensor are difficult to install and may be subject to wear and damage. This leads to increased manufacturing and service costs. It is also undesirable that a user has access to these movable parts when the user takes the printed sheets from the tray.
  • this object is achieved by a discharge system of the type indicated above, wherein a light barrier is arranged adjacent to the discharge nip, said light barrier being arranged to be sensitive to a sheet that is being discharged from the discharge nip and to be sensitive to a stack of sheets on the tray that has reached a certain height.
  • the light barrier may be interrupted when a sheet is present at a certain position.
  • its leading edge interrupts the light barrier.
  • the leading edge of the sheet is detected.
  • the trailing edge of the sheet passes the light barrier, and the interruption of the light barrier ceases.
  • the trailing edge of the sheet is also detected.
  • the light barrier serves as a discharge sensor. As more sheets are discharged from the discharge nip and are collected on the tray, the resulting stack of sheets on the tray grows.
  • the light barrier When the stack has reached a certain height, for example, when the tray is almost full, the trailing edges of the uppermost sheets of the stack eventually interrupt the light barrier. The light barrier is then permanently interrupted until the sheets are removed from the tray.
  • the light barrier also serves as a tray-full sensor.
  • the light barrier may be of a reflection type where the sheet functions as a reflector.
  • a light transmitter and a light receiver of the light barrier may be arranged such that a sheet that is present at a certain position directly or diffusely reflects light from a light transmitter to a light receiver. Said certain position may be chosen to enable the light barrier to detect a sheet that is being discharged from the discharge nip as well as to detect a top sheet of a stack of sheets on the tray when the stack has reached a certain height.
  • An advantage of the invention is that there are no movable parts needed for a discharge sensor and a tray-full sensor. Thus, service costs are reduced. Furthermore, one light barrier can operate as a discharge sensor and a tray-full sensor.
  • the media sheets When the media sheets are supplied from a reel, they are often slightly curled. This effect becomes even more pronounced when the end of the reel is reached and the radius of curvature of the reel becomes smaller.
  • an upwardly curled edge of a sheet may prevent subsequent sheets from being properly stacked and collected on the tray or might block the discharge nip.
  • This situation can be regarded as a virtual tray-full situation. In such a virtual tray-full situation, the light barrier may also be useful to detect an upwardly curled trailing edge of a sheet on the tray.
  • the light barrier may use visible light or infrared light, for example, and may be adapted or adaptable to detect sheets of different material, for example, a paper sheet or a transparency.
  • the light barrier comprises at least two optical elements which are arranged to be on different sides of a sheet that is being discharged from the discharge nip and interrupts the light barrier.
  • the light barrier transversely intersects a sheet transport line.
  • a light transmitter is arranged on the first side of the sheet transport line
  • a light receiver is arranged on the opposite side of the sheet transport line so that the transmitter and the receiver are separated by a sheet that is being discharged from the discharge nip.
  • one of the at least two optical elements is a reflective element for reflecting light from a light transmitter to a light receiver.
  • the light barrier is laterally offset from at least one of the transport elements and intersects the cross section of said transport element.
  • the light barrier is arranged close to the discharge nip, and the leading edge of the sheet is reliably detected by the light barrier even it is not yet detached from said one transport element.
  • a compact design of the discharge system is achieved.
  • a stop extends substantially perpendicular to the tray surface from an edge of the tray adjacent to the discharge nip, and the light barrier is laterally offset from the stop and intersects the cross section of the stop. Due to the stop, the sheets may be neatly stacked on the tray while at the same time the light barrier operates as a tray-full sensor. Moreover, a compact design of the discharge system is achieved.
  • the stop and the light barrier intersect the cross section of at least one of the transport elements and are laterally offset from said transport element.
  • an ink jet printer comprises a platen 10 which is intermittently driven to rotate in order to advance a sheet 12, e. g. a sheet of paper, in a direction indicated by an arrow A over the top surface of a sheet support plate 14.
  • a number of transport rollers 16 are rotatably supported in a cover plate 18 and form a transport nip with the platen 10 so that the sheet 12, which is supplied from a reel 19 via a guide plate 20, is paid out through a gap formed between an edge of the cover plate 18 and the surface of the sheet support plate 14.
  • a carriage 22 which includes a number of ink jet print heads (not shown) is mounted above the sheet support plate 14 so as to reciprocate in a direction that is perpendicular to the plane of the drawing across the sheet 12.
  • a number of pixel lines are printed on the sheet 12 by means of the print heads which eject droplets of ink onto the sheet in accordance with image information supplied to the print heads.
  • guide and drive means for the carriage 22, ink supply lines and data supply lines for the print heads, and the like, have not been shown in the drawing.
  • the printed sheet 12 is cut by a cut-off mechanism (not shown) and is further transported by transport means formed by rollers 110 defining a transport nip that is positioned in the media transport line behind the sheet support plate 14.
  • the rollers 110 advance the sheet 12 along curved guide members 112 that turn the sheet upside down and reverse the transport direction of the sheet 12.
  • the sheet 12 is advanced to a discharge nip 114 formed between a plurality of upper discharge rollers 116 and lower discharge rollers 117, which are mounted on common axles 116a and 117a, respectively.
  • the rollers 110 and the discharge rollers 116, 117 are intermittently driven in order to advance the sheet 12 stepwise.
  • a discharge sensor that is formed by a light barrier 150 is arranged near the discharge nip 114 to indicate when the leading edge 12a of the sheet 12 has been discharged from the discharge nip 114.
  • the light barrier 150 comprises a light transmitter 152 and a light receiver 154.
  • the light receiver 154 is arranged adjacent to upper discharge rollers 116.
  • the light transmitter 152 is arranged in a gap in-between the lower discharge rollers 117, and in the side view of figure 2, the light ray of the light barrier 150 intersects the cross section of the lower discharge rollers 117.
  • the sheet 12 interrupts the light barrier 150.
  • the tray 224 has a top surface 226 for supporting the media sheets.
  • the top surface 226 raises from a lower edge 228 near the discharge nip 114 and the light transmitter 152 to an upper edge 230 (Fig. 1).
  • finger-like stops 232 raise perpendicularly to the tray surface 226 towards the lower discharge rollers 117.
  • the lower discharge rollers 117 and the stops 232 are arranged at intervals, and in the side view of Fig. 2, the stops 232 intersect the lower discharge rollers 117 which are arranged in gaps in-between the stops 232.
  • the light barrier 150 is also arranged in a gap between the stops 232 and, in the side view of Fig. 2, intersects the stops 232.
  • Fig. 2 there is already one sheet 12 lying on the tray 224.
  • sheets 12 are discharged from the discharge nip 114, they are collected on the tray 224, their trailing edges 12b being arranged at the stop 232.
  • a top frame member 238 of the tray 224 serves as an upper guide for the sheets 12.
  • a stack of sheets 12 has been collected on the tray 224.
  • the stack of sheets 12 has reached a height in which the trailing edges 12b of the top most sheet 12 or sheets 12 interrupt the light barrier 150.
  • the light barrier 150 serves as a tray-full sensor.
  • the light barrier 150 may also detect when a sheet 12 is curled upwards at its trailing edge 12c, as is indicated in dashed lines in Fig. 2. Thus, curled edges which might block the discharge nip 114 may be detected by the light barrier 150.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pile Receivers (AREA)
EP04106081A 2004-11-25 2004-11-25 Bogenausgabesystem Withdrawn EP1661836A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04106081A EP1661836A1 (de) 2004-11-25 2004-11-25 Bogenausgabesystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04106081A EP1661836A1 (de) 2004-11-25 2004-11-25 Bogenausgabesystem

Publications (1)

Publication Number Publication Date
EP1661836A1 true EP1661836A1 (de) 2006-05-31

Family

ID=34929943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04106081A Withdrawn EP1661836A1 (de) 2004-11-25 2004-11-25 Bogenausgabesystem

Country Status (1)

Country Link
EP (1) EP1661836A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110255254A (zh) * 2019-06-27 2019-09-20 武汉市海维鑫科技有限公司 一种挡光设备
CN110255255A (zh) * 2019-06-27 2019-09-20 武汉市海维鑫科技有限公司 一种托辊高度可调的挡光装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229650A (en) * 1977-12-14 1980-10-21 Canon Kabushiki Kaisha Position and presence detecting device for stacked sheet members
US4501419A (en) * 1980-08-28 1985-02-26 Canon Kabushiki Kaisha Collator having a transfer capability
US4520263A (en) * 1980-10-21 1985-05-28 Canon Kabushiki Kaisha Collator with photoelectric bin fill detection
EP0369378A1 (de) * 1988-11-11 1990-05-23 Canon Kabushiki Kaisha Bildfixiergerät
US5963754A (en) * 1997-07-18 1999-10-05 Fujitsu Limited Medium detection unit, medium conveyance apparatus and image formation system including a single sensor which detects medium passage, a fully accumulated condition and a jam condition

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229650A (en) * 1977-12-14 1980-10-21 Canon Kabushiki Kaisha Position and presence detecting device for stacked sheet members
US4501419A (en) * 1980-08-28 1985-02-26 Canon Kabushiki Kaisha Collator having a transfer capability
US4520263A (en) * 1980-10-21 1985-05-28 Canon Kabushiki Kaisha Collator with photoelectric bin fill detection
EP0369378A1 (de) * 1988-11-11 1990-05-23 Canon Kabushiki Kaisha Bildfixiergerät
US5963754A (en) * 1997-07-18 1999-10-05 Fujitsu Limited Medium detection unit, medium conveyance apparatus and image formation system including a single sensor which detects medium passage, a fully accumulated condition and a jam condition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110255254A (zh) * 2019-06-27 2019-09-20 武汉市海维鑫科技有限公司 一种挡光设备
CN110255255A (zh) * 2019-06-27 2019-09-20 武汉市海维鑫科技有限公司 一种托辊高度可调的挡光装置

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