US3895790A - Movable bail bar - Google Patents

Movable bail bar Download PDF

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Publication number
US3895790A
US3895790A US380803A US38080373A US3895790A US 3895790 A US3895790 A US 3895790A US 380803 A US380803 A US 380803A US 38080373 A US38080373 A US 38080373A US 3895790 A US3895790 A US 3895790A
Authority
US
United States
Prior art keywords
stack
arm member
bail
lever
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.)
Expired - Lifetime
Application number
US380803A
Other languages
English (en)
Inventor
August Hoyer
Ronald M Nekula
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Priority to US380803A priority Critical patent/US3895790A/en
Priority to CA198,602A priority patent/CA1009267A/en
Priority to FR7416341A priority patent/FR2237827B1/fr
Priority to SU7402034581A priority patent/SU563907A3/ru
Priority to BR5328/74A priority patent/BR7405328A/pt
Priority to SE7407287A priority patent/SE7407287L/xx
Priority to DE2432776A priority patent/DE2432776A1/de
Priority to JP8012074A priority patent/JPS5719430B2/ja
Priority to AU71230/74A priority patent/AU7123074A/en
Priority to IT15/74A priority patent/IT1017271B/it
Priority to NL7409763A priority patent/NL7409763A/xx
Priority to GB31937/74A priority patent/GB1481107A/en
Application granted granted Critical
Publication of US3895790A publication Critical patent/US3895790A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/62—Holders for the original
    • G03B27/6207—Holders for the original in copying cameras
    • G03B27/625—Apparatus which relate to the handling of originals, e.g. presence detectors, inverters
    • G03B27/6264—Arrangements for moving several originals one after the other to or through an exposure station

Definitions

  • ABSTRACT Movable pressure bail bar for biasing a sheet stack towards a bottom feed separator roll.
  • the bail bar is raised from pressure contact with the stack by a solenoid operated lever arrangement after the bottom most sheet is separated from the stack to minimize the drag of frictional contact between the separated sheet and the adjacent sheet in the stack. Lifting of the bail bar permits return of additional sheets separated along with the bottom most by a downstream retard roller.
  • MOVABLE BAIL BAR BACKGROUND OF THE INVENTION In order to more fully utilize the high speed copying capabilities of modern reproduction machines, it is desirable to employ an automatic document handler for placing original documents to be copied on the platen of the reproduction machine and removing them therefrom to minimize the necessity for operator involvement with the reproduction machine. To accomplish this, the document handling device first must separate the document to be copied from others awaiting copying. Following this, the document must be brought into position on the machine platen. There, the document s normally located in a certain position, copied and removed, to enable succeeding copies to be placed on the platen. The document handler must be designed to positively separate, feed, position, and return the documents to the document tray.
  • This invention relates to an automatic document handler employing a bail bar to separate documents being fed by an automatic document handler from the documents returned by the automatic document handler.
  • the bail bar is also utilized to provide a normal force on the paper to enable a feeder roll therebeneath to positively feed a single document or a number of documents from the stack of documents in the supply tray beneath the bail bar.
  • the bail bar is lifted a preselected distance off from the remaining documents in the stack at a preselected time by a lift lever mechanism after initial feeding of each document to allow multi-fed documents to be returned to the document stack by a suit able multiple document rejecting mechanism.
  • FIG. 1 is a side view in cross-section showing a document handler incorporating the improved bail bar mechanism of the present invention in operative association with a document reproduction machine;
  • FIG. 2 is an isometric view showing details of the document separating bail bar mechanism
  • FIG. 3 is a side view of a portion of the document handler of FIG. 1 showing further details of one embodiment of the separating bail bar lift mechanism;
  • FIG. 4 is an isometric view illustrating a second embodiment of the bail bar lift mechanism
  • FIG. 5 is a sectional view showing details of the clutch mechanism utilized in the embodiment illustrated in FIG. 4;
  • FIG. 6 is a partial sectional view of the portion of the clutch mechanism of FIG. 5 illustrating the ball-ramp portion thereof.
  • a document handler designated generally by the numeral 10 incorporating the bail bar mechanism of the present invention.
  • the document handler 10 may be used with any suitable document processing apparatus, such as a reproduction machine 5 which is provided with a platen 6 on which the document to be copied is placed.
  • Document handling apparatus 10 includes a supply tray 12 for storing both documents 7 to be copied and documents 8 which have been copied. From tray 12, one or more documents are advanced from the bottom of supply 7 by an intermittently operated primary feed roll 14 into the nip of retard roll pair 16, 17. The lower roll 16 is driven in a document feeding direction (as shown by the dotted line arrow in FIG. 1) while the upper roll 17 is driven in the reverse or document reject direction by a suitable slip coupling (not shown).
  • Frictional engagement between roll 16 and roll 17 normally provides sufficient driving force on roll 17 to override the drive input to roll 17 (i.e., the coupling slips) and thereby allows roll 16 to turn roll 17 in the document feeding direction.
  • Transport 20 which preferably comprises a belt type conveyor, first carries the document forward onto platen 6 until the entire document is positioned thereon. Transport 20 is then reversed to bring the document trailing edge against register 22. Register 22 locates the document in copying position following which the copy or copies are made by the reproduction apparatus 5.
  • platen transport 20 is again started in reverse to move the document backwards off platen 6, register edge being previously retracted for this purpose.
  • Deflector 21 which was previously lowered, guides the returning document upwardly into the nip of return roll pair 23.
  • Roll pair 23 move the document along suitable return guides 26 through second and third return roll pairs 27, 28 respectively and back into tray 12.
  • Bail 32 is disposed substantially opposite to and above primary feed roll 14 to prevent documents resting thereon from contacting roll 14.
  • the bail 32 is biased against primary feed roll 14 by suitable springs 34 forcing the documents to be fed against roll 14 to provide frictional engagement between roll 14 and the document resting thereagainst for positive feeding of the document by the roll 14.
  • the retard roll 17 will operate in reverse to drive the excess documents back into the tray.
  • the documents in the tray are forced against the feed roll 14 by the bail 32.
  • the bail is lifted from the documents by a suitable mechanism to be hereinafter described.
  • lever arms 36 mounted on a rotatable shaft 38 are provided on each side of the document handler.
  • the arms 36 are nonrotatably mounted on shaft 38 while extensions 39 of shaft 38 are rotatably mounted in suitable bearings (not shown) on the frame of the document handler.
  • Bail 32 is provided with extensions 40 adapted for engagement with bearing ends 42 of levers 36, movement of levers 36 about the axis of shaft 38 causing the bearing ends 42 of levers 36 to lift the bail 32 from the surface of the documents in the stack 7.
  • the opposite end of one of the levers 36 is provided with an arcuate surface 44 having serations thereon.
  • a second lever 46 pivotally mounted on a shaft pin 48 and secured thereto by a snap ring 49 is provided with a resilient pad 50 adapted for contact with the serated surface on lever 36 upon rotation of lever 46 about pin 48.
  • the arcuate surface 44 has an axis coinciding with the axis of shaft 38 to provide constant spacing between pad 50 and the serations on surface 44 irrespective of the orientation of lever 36 for reasons to be hereinafter explained.
  • Actuating means such as solenoid 52 is operatively connected to lever 46 to displace pad 50 a predetermined distance along an arc about pivot pin 48.
  • the solenoid is connected to lever 46 by a cable 54 although it should be understood the solenoid could be directly connected to the lever.
  • a pneumatic cylinder, an electric motor with suitable cams r linkages or other similar devices could be utilized to impart pivotal movement to lever 46.
  • solenoid 52 is actuated by a suitable control circuit (not shown) in response to the presence of a document at a selected location along the document path.
  • a photodetector 53 is mounted on the document handler to detect the presence of a fed document immediately downstream from feed roller pair 18, 19. It should be understood that the detector could be mounted immediately downstream from roll pair 16, 17 if desired.
  • the signal from the photodetector causes the solenoid 52 to be energized to rock lever 46 about pivot 48 to lift bar 32, removing the pressure on documents 7 to allow multiply fed documents to be returned to the tray by retard roller 17.
  • the bail bar lift mechanism is therefore adapted to lift the bar a preselected distance from the stack of documents 7, irrespective of the actual location of the bar relative to the feed roll 14.
  • a light spring 56 is provided to levers 36 to maintain bearing ends 42 against extensions 40 on bar 32 at all times.
  • the arcuate sector 44 on lever 36 is designed to provide constant spacing between the surface thereof and the lift pad 50 on lever 46 irrespective of the bail bar location relative to the feed roll 14.
  • a preselected stroke of the solenoid will move pad 50 of lever 46 about a preselected arc to contact sector 44 of lever 36 and lift bar 32 the desired distance from the top of the stack 7, for example, .010 inches, irrespective of the actual orientation of the bar 32 and the lever 36 when the lift mechanism is actuated.
  • a ball-ramp clutch is provided to move levers 36 and thereby lift bail bar 32 from the stack of documents 7.
  • the clutch assembly 60 includes a mounting plate 62 adapted for connection by suitable means such as bolts 64 to the frame of the document handler.
  • the base is provided with a shaft 66 integrally formed thereon.
  • a first arm member 70 is rotatably mounted on shaft 66 and retained in position thereon by suitable collars 72 and 74. Arm member 70 is connected to one of the lever arms 36 by means of a link 76.
  • a second arm member 78 is also rotatably mounted on shaft 66 and is biased by spring 79 against a stationary plate 80 secured to shaft 66 by means of a key 82 and a nut 84 which is in threaded engagement with shaft 66.
  • Stationary plate 80 is provided with ramps 86 for receiving balls 88 therein.
  • Ramps 90 extending in a direction opposite to ramps 86 are formed in second member 78 for engagement with balls 88.
  • Second arm member 78 is connected to solenoid 52 by means of cable 54 and is provided with a clutch surface 92 adapted for cooperation with a clutch surface 94 formed on member 70.
  • second arm member 78 upon ac tuation of solenoid 52, second arm member 78 will be rotated about shaft 66 through a preselected arc. Rotation of arm member 78 relative to stationary plate 80 will cause balls 88-to ride up ramps 86 and 90, forcing surface 92 to second arm member '78 into contact with clutch surface 94 of member 70 to lock members 70 and 78 together and cause member 70 to rotate about shaft 66 and through link 76 move levers 36 to lift bail bar 32 off the stack of documents 7 in the tray.
  • member 70 Since member 70 is freely rotatable about shaft 66 relative to second member 78 when solenoid 52 is deenergized, arm member 70 will assume a position relative to second arm member 78 determined by the thickness of documents in the tray and therefore the location of bar 32. However, since member 70 will be contacted by member 78 after a predetermined rotational movement of member 78 caused by energization of solenoid 52 and thereafter be moved through a predetermined arc thereby, the bar 32 will be lifted from the stack of documents a predetermined distance, for example, .010 inches irrespective of the thickness of the stack thereunder.
  • Drag on the separated document is reduced, thereby reducing the force necessary for forwarding the document by subsequent means such as the feed roll pair 16, 17.
  • Multiply fed documents may freely fall back into the tray after being urged toward the tray by the retard roll 17.
  • a further advantage is obtained by the cyclical movement of the bar 32 in that the documents in the tray are vibrated thereby, enhancing settlement and alignment of the documents in the document tray.
  • Apparatus for separating and feeding individual sheets of material from a stack of sheet material comprising:
  • separator means adapted for frictional engagement with the bottom sheet in the stack to displace the sheet in a direction parallel to the plane of the sheet;
  • bail means adapted for engagement with the top of the stack, said bail means including biasing means to bias said bail against the stack to provide a force normal to the plane of the sheet for maintaining the bottom sheet of the stack in frictional engagement with said separator means;
  • feed means for engaging and feeding the separated sheets away from the stack
  • lever means pivotally mounted on said apparatus for engagement with said bail means, pivotal movement of said lever means causing said lever means to lift said bail means from said stack, said lever means including a lever having an arcuate sector formed on one end thereof, the other end of said lever being adapted for contact with said bail means;
  • biasing means for maintaining said lever in contact with said bail means irrespective of the thickness of the stack of sheet material under said bail means
  • actuating means including an arm pivotally mounted on said apparatus for contact with said sector when said actuating arm is rotated through a predetermined arc, contact of said actuating arm with the sector portion of said lever causing the other end of said lever to move through an arc of predetermined length to lift said bail means a predetermined distance from the top of the stack irrespective of the thickness of the stack after engagement of the separated sheet by said feed means to minimize the drag on the separated sheet caused by frictional contact between the separated sheet and the adjacent sheet in the stack.
  • Apparatus according to claim 1 further including solenoid means operatively connected to said actuating arm, energization of said solenoid causing said arm to move through a predetermined are for contact with and displacement of said sector to thereby lift said bail means.
  • Apparatus for separating and feeding individual sheets of material from a stack of sheet material comprising:
  • separator means adapted for frictional engagement with the bottom sheet in the stack to displace the sheet in a direction parallel to the plane of the sheet;
  • bail means adapted for engagement with the top of the stack, said bail means including biasing means to bias said bail against the stack to provide a force normal to the plane of the sheets for maintaining the bottom sheet of the stack in frictional engagement with said separator means;
  • feed means for engaging and feeding the separated sheets away from the stack
  • lift means including lever means pivotally mounted on said apparatus for engagement with said bail means, pivotal movement of said lever means causing said lever means to lift said bail means from said stack;
  • biasing means for maintaining said lever means in contact with said bail means irrespective of the thickness of the stack of sheet material under said bail means
  • lever means for actuating said lever means including clutch means having a first arm member connected to said lever means;
  • solenoid means operatively connected to said second arm member, said first arm member being positioned by said lever means and said bail means when said solenoid is de-energized, said second arm member being adapted to move said first arm member and the lever means associated therewith through an arc of predetermined length when said solenoid assembly is energized.
  • said clutch means includes a stationary member having ramp means formed therein, stationary shaft means associated with said stationary member, said first arm member being rotatably mounted on said shaft, said second arm member being rotatably mounted on said shaft opposite said stationary member, said second arm member having a surface thereon with ramp means formed therein opposite the ramp means formed in said stationary member;
  • biasing means for urging said second arm member toward said stationary member, rotation of said second arm member about said shaft causing said second arm member to move axially along said shaft against said biasing means, said first arm member having a surface thereon adapted for contact with said second arm member when said second arm member is moved axially on said shaft, rotation of said second arm member after contact with said first arm member causing said first arm member to rotate through an arc of predetermined length to move said lever means and lift said bail means a predetermined distance from the stack.
  • said clutch means further includes balls, disposed in said ramp means, rotation of said second arm member causing said balls to ride up in said ramps to force said second arm member away from said stationary member into contact with said first arm member, rotation of said second arm member after contact with said first arm member causing rotation of said first arm member.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Holders For Sensitive Materials And Originals (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)
US380803A 1973-07-19 1973-07-19 Movable bail bar Expired - Lifetime US3895790A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US380803A US3895790A (en) 1973-07-19 1973-07-19 Movable bail bar
CA198,602A CA1009267A (en) 1973-07-19 1974-04-25 Sheet feeding mechanism
FR7416341A FR2237827B1 (ja) 1973-07-19 1974-05-10
SU7402034581A SU563907A3 (ru) 1973-07-19 1974-06-18 Устройство дл подачи листового материала из стопы
BR5328/74A BR7405328A (pt) 1973-07-19 1974-06-27 Aparelho para separar e alimentar folhas individuais de material provenientes de um pilha de material em folha
SE7407287A SE7407287L (ja) 1973-07-19 1974-07-04
DE2432776A DE2432776A1 (de) 1973-07-19 1974-07-08 Vorrichtung zum vereinzeln und abfuehren von blattmaterial von einem blattstapel
JP8012074A JPS5719430B2 (ja) 1973-07-19 1974-07-12
AU71230/74A AU7123074A (ja) 1973-07-19 1974-07-15
IT15/74A IT1017271B (it) 1973-07-19 1974-07-18 Apparecchiatura per alimentare fo gli particolarmente per macchine copiatrici
NL7409763A NL7409763A (ja) 1973-07-19 1974-07-18
GB31937/74A GB1481107A (en) 1973-07-19 1974-07-18 Apparatus for separating and feeding individual sheets of material from a stack of said sheets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US380803A US3895790A (en) 1973-07-19 1973-07-19 Movable bail bar

Publications (1)

Publication Number Publication Date
US3895790A true US3895790A (en) 1975-07-22

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Application Number Title Priority Date Filing Date
US380803A Expired - Lifetime US3895790A (en) 1973-07-19 1973-07-19 Movable bail bar

Country Status (4)

Country Link
US (1) US3895790A (ja)
JP (1) JPS5719430B2 (ja)
CA (1) CA1009267A (ja)
IT (1) IT1017271B (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3966193A (en) * 1975-03-12 1976-06-29 Pitney-Bowes, Inc. Mail handling stacking and feeding apparatus
US4034976A (en) * 1975-04-07 1977-07-12 Inter Innovation Ab Sheet feeding apparatus
US4060232A (en) * 1976-11-12 1977-11-29 International Business Machines Corporation Controlled slip paper separator
US4168058A (en) * 1977-11-30 1979-09-18 Ncr Corporation Record member feeding device
US4418904A (en) * 1979-08-27 1983-12-06 Ricoh Company, Ltd. Sheet feeding apparatus
US4561644A (en) * 1982-09-21 1985-12-31 Xerox Corporation Sheet feeding and separating apparatus with stack force relief/enhancement
US4570061A (en) * 1984-11-16 1986-02-11 International Business Machines Corporation Follower finger sheet separating apparatus
US8280263B2 (en) 2011-01-31 2012-10-02 Xerox Corporation Multi-feed detection and control system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5957841A (ja) * 1982-09-24 1984-04-03 Ricoh Co Ltd シ−ト送り装置
JPS6023039U (ja) * 1983-07-22 1985-02-16 興亜硝子株式会社 薬瓶
EP0160711B1 (de) * 1984-05-03 1988-12-07 Bünder Glas GmbH Injektionsspritze
JPH0454419A (ja) * 1990-06-21 1992-02-21 Nikko Co Ltd バッチ式計量器による連続式ミキサへの払い出し方法
WO2009123150A1 (ja) 2008-04-01 2009-10-08 生化学工業株式会社 薬液吐出部密封キャップ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1071243A (en) * 1911-12-27 1913-08-26 Henryk Kurkiewicz Machine for taking off single strips from a pile of paper strips.
US3556513A (en) * 1968-12-04 1971-01-19 Xerox Corp Document feed apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1071243A (en) * 1911-12-27 1913-08-26 Henryk Kurkiewicz Machine for taking off single strips from a pile of paper strips.
US3556513A (en) * 1968-12-04 1971-01-19 Xerox Corp Document feed apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3966193A (en) * 1975-03-12 1976-06-29 Pitney-Bowes, Inc. Mail handling stacking and feeding apparatus
US4034976A (en) * 1975-04-07 1977-07-12 Inter Innovation Ab Sheet feeding apparatus
US4060232A (en) * 1976-11-12 1977-11-29 International Business Machines Corporation Controlled slip paper separator
US4168058A (en) * 1977-11-30 1979-09-18 Ncr Corporation Record member feeding device
US4418904A (en) * 1979-08-27 1983-12-06 Ricoh Company, Ltd. Sheet feeding apparatus
US4561644A (en) * 1982-09-21 1985-12-31 Xerox Corporation Sheet feeding and separating apparatus with stack force relief/enhancement
US4570061A (en) * 1984-11-16 1986-02-11 International Business Machines Corporation Follower finger sheet separating apparatus
US8280263B2 (en) 2011-01-31 2012-10-02 Xerox Corporation Multi-feed detection and control system
US8437646B2 (en) 2011-01-31 2013-05-07 Xerox Corporation Dual nip multi-feed detection and control system

Also Published As

Publication number Publication date
JPS5039953A (ja) 1975-04-12
JPS5719430B2 (ja) 1982-04-22
CA1009267A (en) 1977-04-26
IT1017271B (it) 1977-07-20

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