US3868666A - Method and arrangement for handling sheet goods - Google Patents

Method and arrangement for handling sheet goods Download PDF

Info

Publication number
US3868666A
US3868666A US392808A US39280873A US3868666A US 3868666 A US3868666 A US 3868666A US 392808 A US392808 A US 392808A US 39280873 A US39280873 A US 39280873A US 3868666 A US3868666 A US 3868666A
Authority
US
United States
Prior art keywords
air gap
electrode
arrangement
sheet goods
establishing
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
US392808A
Other languages
English (en)
Inventor
Karl Hartwig
Gunther Maurischat
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Application granted granted Critical
Publication of US3868666A publication Critical patent/US3868666A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B65H7/04—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 absence of articles, e.g. exhaustion of pile

Definitions

  • the invention relates to methods for detecting improperly transported and/or improperly oriented sheet goods in arrangements for transporting and processing sheet goods, in particular in electrostatic copying arrangements, and furthermore relates to arrangements for accomplishing such detection.
  • Such detection arrangements prevents the sheet transporting and sheet processing arrangements from becoming damaged by improperly transported or improperly oriented sheets, e.g., by a plurality of sheets improperly sticking together and travelling as a single sheet of multiple thickness, or by skew sheets.
  • Such detection arrangements can also be used to initiate a sheet-transport or sheet-handling operation upon detection of the leading edge of a sheet and to terminate such operation upon detection of the trailing edge of a sheet.
  • first and second electrode means spaced from each other to define an air gap, and establishing a flow of ionic current across the air gap from one to the other of the electrode means.
  • Sheet goods are transported along a predetermined path passing through the air gap and so oriented that sheet goods travelling through the air gap do not contact the first and second electrode means.
  • the magnitude of the ionic current is monitored in order to determine whether or not an article of sheet goods is located in the air gap.
  • the transporting of the sheet goods and/or the operation of sheet processing machines can be controlled in dependence upon the monitored magnitude of the ionic current.
  • the method and arrangement according to the invention are advantageous in that they may be employed more or less without regard to variations in sheet transparency and color, and are not detrimentally affected to any great extent by dirtying of the detecting equip ment, aging or small imprecisions in the relative positioning of the different components of the arrangement.
  • FIGURE depicts in schematic form one exemplary embodiment according to the invention.
  • FIGURE depicts in very schematic form only as much of a sheet transporting arrangement and sheet handling machine as is necessary for an understanding of the invention.
  • Reference numeral 1 designates a source of high voltage, which may be either AC. or DC In the illustrated embodiment the source 1 furnishes at its output a DC.
  • the corona discharge conductor 3 has a pointed end and is spaced from a collector electrode 4, to define therewith an air gap.
  • the collector electrode 4 is connected to ground via a further resistor R having a resistance of 10 ohms.
  • a transporting arrangement is provided for transporting sheets 8 along a predetermined path which passes through the air gap between electrodes 3 and 4.
  • the transporting arrangement is comprised of two guide plates 6 and 7 defining a thin clearance along the length of which the sheets 8 can be passed.
  • the sheets 8 themselves are moved along this path in direction of arrow A by transport rollers 9 and 10 which are driven by a non-illustrated drive motor.
  • the guide plates 6 and 7 are provided with openings 6a and 7a through which corona discharge current can flow from electrode 3 to collector electrode 4.
  • the size of the openings 60 and 7a has been exaggerated in the drawing for the sake of clarity, and will advantageously be smaller. Also, it should be understood that the distance between the input end of the conveyor guide plates 6,7 and the drive rollers 8 and 9 is sufficiently small that the trailing edge of a sheet 8 inserted into the path defined by plates 6,7 will be engaged by nonillustrated transporting means located upstream of the input into conveyor 6, 7, 9, 10 at the moment when the leading edge of a sheet 8 is engaged by the transporting rollers 9 and 10.
  • the circuit junction 20 between electrode 4 and resistor. R is connected by way of conductor 11 to the input of an amplifier 12, which receives operating current via a supply line 13.
  • the output of amplifier 12 is connected, via a further conductor 14, to a relay 15 the other terminal of which is connected to ground.
  • the relay 15 controls a switch 17 which is connected by means of conductors 18 and 19 to an alarm unit and to a schematically depicted motor shutoff switch operative for terminating operation of transport rollers 9 and 10 when switch 17 becomes closed.
  • the distance between the discharge spike 3 and the collector electrode 4 is so selected that, in the absence of a sheet 8 in the air gap therebetween, no voltage breakdown will occur.
  • the magnitude of the ionic current under such circumstances will be large enough to produce across resistor R a voltage drop sufficiently great to be detected by amplifier 12.
  • switch 17 becomes closed, causing an alarm signal to, be generated and causing the operation of transport rollers 9, 10 to become terminated.
  • the alarm signal can be visual or acoustic.
  • the output of amplifier 12 can be connected to the input of a logiccircuit operative for triggering an alarm signal and/or terminating the sheet transporting operation when a sheet enters the detection zone out ofphase with the proper time of entry therefor.
  • switch 17 could be-used to activate some functional group in a sheet-processing machine, such as an electrostatic copier, in response to detection of the arrival of a sheet in the detection zone 6a, 7a.
  • a corona discharge electrode having a pointed end; an elongated collector electrode spaced from said corona discharge electrode to form therewith an air gap; means for establishing a flow of ionic current across said air gap from said corona discharge electrode to said elongated collector electrode; transporting means for transporting sheet goods along a predetermined path passing through said air gap in direction transverse to the direction of elongation of said elongated collector electrode and so oriented that sheet goods travelling along said predetermined path and through said air gap do not physically contact said electrodes; and monitoring means operative for determining whether or not an article of sheet goods is located in said air gap by monitoring the magnitude of said ionic current.
  • said means for establishing a fiowof ionic current comprises means for establishing a predetermined potential difference across said electrodes, and wherein said'electrodes are spaced from each other a distance large enough to prevent developmentof a voltage breakdown across said air gap when no sheet goods are present in said air gap.
  • said means for establishing a predetermined potential difference comprises means for establishing acro'ss'said electrodes a potential difference of between 3 kV and 4.
  • said means for establishing a flow of ionic'current comprises means'for maintaining said corona discharge electrode at a potential of about 5 kV;

Landscapes

  • Elimination Of Static Electricity (AREA)
  • Controlling Sheets Or Webs (AREA)
US392808A 1972-08-31 1973-08-29 Method and arrangement for handling sheet goods Expired - Lifetime US3868666A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2242948A DE2242948C2 (de) 1972-08-31 1972-08-31 Verfahren zur berührungslosen Feststellung von fehlerhaft transportiertem oder angelegtem Blattmaterial und Vorrichtung zur Durchführung des Verfahrens

Publications (1)

Publication Number Publication Date
US3868666A true US3868666A (en) 1975-02-25

Family

ID=5855164

Family Applications (1)

Application Number Title Priority Date Filing Date
US392808A Expired - Lifetime US3868666A (en) 1972-08-31 1973-08-29 Method and arrangement for handling sheet goods

Country Status (4)

Country Link
US (1) US3868666A (show.php)
DE (1) DE2242948C2 (show.php)
FR (1) FR2198473A5 (show.php)
GB (1) GB1446200A (show.php)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5110115A (en) * 1989-04-05 1992-05-05 Unisys Corporation Document transport and detection apparatus
US20050229928A1 (en) * 2004-04-20 2005-10-20 Aerogen, Inc. Aerosol delivery apparatus and method for pressure-assisted breathing systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4336479A1 (de) * 1993-10-26 1995-04-27 Heidelberger Druckmasch Ag Steuereinrichtung für den Transport von Werkstücken in einer drucktechnischen Maschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339125A (en) * 1964-08-03 1967-08-29 Leonard B Almy Proximity detectors
US3439263A (en) * 1968-07-03 1969-04-15 Ltv Aerospace Corp Ionic current proximity gage
US3609737A (en) * 1968-06-28 1971-09-28 Xerox Corp Method and apparatus for article detection utilizing corona discharge
US3623058A (en) * 1968-11-18 1971-11-23 Addressograph Multigraph Sheet-sensing apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339125A (en) * 1964-08-03 1967-08-29 Leonard B Almy Proximity detectors
US3609737A (en) * 1968-06-28 1971-09-28 Xerox Corp Method and apparatus for article detection utilizing corona discharge
US3439263A (en) * 1968-07-03 1969-04-15 Ltv Aerospace Corp Ionic current proximity gage
US3623058A (en) * 1968-11-18 1971-11-23 Addressograph Multigraph Sheet-sensing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5110115A (en) * 1989-04-05 1992-05-05 Unisys Corporation Document transport and detection apparatus
US20050229928A1 (en) * 2004-04-20 2005-10-20 Aerogen, Inc. Aerosol delivery apparatus and method for pressure-assisted breathing systems

Also Published As

Publication number Publication date
DE2242948C2 (de) 1982-07-15
DE2242948A1 (de) 1974-03-14
FR2198473A5 (show.php) 1974-03-29
GB1446200A (en) 1976-08-18

Similar Documents

Publication Publication Date Title
US3742477A (en) Conveyor belt condition monitoring apparatus
US4176941A (en) Malfunction display system for electrophotographic copying machines
US3856414A (en) Apparatus for inspecting strip material
US5970274A (en) Jam detection system
US3878540A (en) Paper feed stoppage detection means in an electronic photocopying machine
US4532500A (en) Web tension and break sensor system for photosensitive web processors
US3868666A (en) Method and arrangement for handling sheet goods
KR970061718A (ko) 지폐처리기
US4136454A (en) Apparatus for gauging the thickness of moving laminar material
US3283163A (en) Photosensitive overlapped document detector
US3773321A (en) Overlapped document detector
US3176981A (en) Sheet detector
GB1432596A (en) Web sensing apparatus
US3709604A (en) Roll end detector
US3488048A (en) Document feeder
US3612270A (en) Cutter piler with electrostatic layboy
US3584733A (en) Transport system for single sheets of photosensitive material
GB1413069A (en) Apparatus for monitoring a sheet transport mechanism
US4249080A (en) Jam-sensing system and apparatus
US2834450A (en) Counting system for stacker
JPS6026546A (ja) シ−ト揃え装置
US3623058A (en) Sheet-sensing apparatus
JPS6317750A (ja) 紙葉給紙装置
JPS6230917B2 (show.php)
JPH06167574A (ja) シ ー ト 状 物 体 の 検 出 装 置