EP0066471B1 - Appareil pour l'alimentation en feuilles - Google Patents

Appareil pour l'alimentation en feuilles Download PDF

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Publication number
EP0066471B1
EP0066471B1 EP19820302794 EP82302794A EP0066471B1 EP 0066471 B1 EP0066471 B1 EP 0066471B1 EP 19820302794 EP19820302794 EP 19820302794 EP 82302794 A EP82302794 A EP 82302794A EP 0066471 B1 EP0066471 B1 EP 0066471B1
Authority
EP
European Patent Office
Prior art keywords
vacuum
sheet
plenum
belt
level
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
Application number
EP19820302794
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German (de)
English (en)
Other versions
EP0066471A1 (fr
Inventor
Richard S. C/O Beth Read Eastman Kodak Co. Muka
Roger T. Dragstedt
John J. Konik
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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
Priority claimed from US06/269,168 external-priority patent/US4362380A/en
Priority claimed from US06/269,167 external-priority patent/US4421306A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0066471A1 publication Critical patent/EP0066471A1/fr
Application granted granted Critical
Publication of EP0066471B1 publication Critical patent/EP0066471B1/fr
Expired 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
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
    • B65H5/222—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices
    • B65H5/224—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices by suction belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/32—Suction belts
    • B65H2406/322—Suction distributing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/32—Suction belts
    • B65H2406/323—Overhead suction belt, i.e. holding material against gravity

Definitions

  • This invention relates to sheet feeding apparatus, such as that used to feed document sheets to an exposure platen of a copier/duplicator. More particularly, the invention relates to an improved vacuum transport for feeding sheets along a predetermined path.
  • drive rollers are used for advancing sheets across the platen and against a registration member.
  • the drive rollers continue to be driven after the sheet reaches the registration point and thereby slip on the sheet. This allows the sheet to adjust itself into a registered position and thereby eliminate skew that may have developed in the sheet as it was moved from the stack of sheets to the registration member. Generally, this continued driving of the sheet against the registration members does not adversely affect the sheet.
  • the sheet may be gripped against the vacuum belt with a relatively high vacuum force.
  • an object of this invention is to provide an improved vacuum transport means for reliably advancing sheets along a predetermined path into abutment with a sheet registration member without damaging the sheet's leading edge.
  • the method of feeding a sheet along a predetermined path into abutment with a sheet registration member using a vacuum belt is characterized by the steps of feeding a sheet onto the path, applying vacuum at a first level through the belt to tack the sheet to the vacuum belt and to draw the sheet along the path, and applying vacuum through the belt at a second lower level to transport the sheet along the path into abutment with the registration member so as to permit relative slipping between the sheet and the belt.
  • the sheet feeding apparatus including a vacuum transport means for advancing a sheet along a predetermined path to a sheet registration member which is arranged to abut the leading edge of the advancing sheet to remove any skew of the sheet relative to the path, the vacuum transport means comprising a vacuum belt, drive means forad- vancing the belt along the path, and vacuum means for tacking sheets to the belt and drawing the sheets along the path, the vacuum means including a source of vacuum and vacuum plenum means coupled to the source and positioned adjacent the belt, is characterized in that the vacuum means comprises control means for controlling the level of vacuum applicable through the belt between a first level for initially tacking a sheet to the belt and a second lower level sufficient for the belt to transport a sheet into contact with the registration member and yet to permit relative slipping between the sheet and the belt upon such contact.
  • a sheet feeder embodying the present invention is generally designated 10 and is shown in an environment in which it is used to present document sheets to an exposure platen 12 of a copier/duplicator or the like, a portion of which is shown at 14.
  • the sheet feeder 10 and copier 14 are the same as, or similar to, the disclosures in the beforementioned Research Disclosure Publication and in the commonly assigned U.S. Patents.
  • the feeder 10 has a tray 16 spaced above the platen 12.
  • the feeder is open at the top so that a set of document sheets S arranged in stack can be placed on the tray 16 for removal seriatim beginning with the lowermost sheet in the stack. Removal of the sheets from the stack is effected by a sheet feeder 18 comprising an oscillating vacuum tube.
  • the feeder tube has a series of ports 19 arranged in a row as shown in Fig. 2. The ports are located beneath an opening 20 in the tray so that when vacuum is applied to the feeder 18 the lowermost sheet in tray 16 is attracted to the tube. Then the tube is rotated in a clockwise direction as viewed in Fig. 1 to bring the leading edge of the sheet into a nip between drive rollers 22 and rings 24.
  • the rings are rotatably mounted on the tube 18 and recessed into the tube so that the outer surface of the rings and tube are substantially aligned.
  • the removed sheet is then fed through a guide slot 26 onto the platen 12.
  • the guide slot 26 is defined by the surface of the tube 18, by an arcuate guide 28 adjacent to the tube, and by a flat plate 30 which is located above the platen and limits upward movement of the sheet away from the platen.
  • Registration member 34 can be of any suitable construction and may, for example, be constructed as disclosed in commonly assigned U.S. Patent No. 4,243,316, entitled Registration Mechanism, which issued January 6, 1981 in the name of G. B. Gustafson.
  • transport 32 continues to urge the sheet against the registration member 34 even after initial contact therebetween so that any skew or misalignment that may exist in the sheet will be removed by allowing the driven sheet to adjust its relative position on the platen until all the leading edge of the sheet is aligned with the gate member 34.
  • the sheet is properly aligned it is exposed by flash lamps (not shown) located beneath the platen 12 or by a scanning mechanism. An image of the document sheet is formed on a photoconductor and a copy of the document is produced in a conventional manner.
  • gate member 34 After exposure of the document sheet, gate member 34 is lifted to its dotted line position above the sheet path. Transport 32 then drives the sheet off the platen and into the nip between a pair of rollers 36 and 38. Ordinarily those rollers drive the sheet into a guide path 40 defined by a pair of stationary guide members 42 and 44 and a movable guide member 46. Normally the movable guide member 46 is urged into the position illustrated by a spring shown diagrammatically at 48. When a sheet is to be removed from the feeder 10 after exposure (i.e., not recirculated), the movable guide member 46 is swung about a pivot 50 away from its solid line position into its dotted line position. This movement can be accomplished by any suitable moving means, such as a solenoid (not shown). When guide member 46 is in its dotted line position the sheet is deflected out of the feeder along a path shown by arrow 52.
  • a solenoid not shown
  • the sheet is driven along guide path 40 by rollers 36, 38 and by two additional pair of rollers 54, 56 and 58, 60 located along the path.
  • the sheet leaves the upper end of guide path 40 above the tray 16 and above the sheets S resting in the tray.
  • the sheet is returned to the stack of sheets on top of other sheets remaining in the stack.
  • the result of one complete circulation of a sheet as described is that a sheet is inverted once after it is removed from the stack and before presentation for copying on the platen 12, and then inverted a second time after removal from the platen and before being returned to the tray 16.
  • a sheet occupies the same position, relative to other sheets, before and after seriatim circulation of the entire set of document sheets.
  • the feeder has a document positioner mode of operation wherein a document sheet is fed to the platen along a non-recirculating path for copying one or more times.
  • the sheet is fed to the feeder along a path shown at 62 in Fig. 1.
  • the sheet is driven onto the platen 12 and into path 26 by a pair of nip rollers 64, 66.
  • the movable guide member 46 is swung to its dotted line position and the transport 32 drives the sheet off the platen and into the nip between rollers 36, 38.
  • the sheet is driven along path 52 and removed from the feeder.
  • This document positioner mode of operation is disclosed in more detail in the beforementioned Research Disclosure Publication and in U.S. Patent No. 4,176,945.
  • the platen vacuum transport 32 preferably comprises a pair of endless vacuum belts 70 and 72 which are trained about three rollers 74, 76 and 78.
  • Roller 74 is coupled to a motor 80 as shown schematically in Fig. 1 so that the roller 74 is driven in a clockwise direction as viewed in Fig. 1. Movement of roller 74 is effective to rotate the belts 70 and 72 about the various rollers, thereby moving the lowermost reach of the belts in a right-to-left direction as viewed in Fig. 1 for advancing a sheet toward the registration member 34.
  • the belts 70 and 72 are of a white material and have a multiplicity of small holes therethrough through which air can be drawn for attracting a sheet to the belt.
  • the belts are shown in Fig. 2 as being spaced from each other but they can be closely adjacent to each other or a single belt can be used if desired.
  • Plenum 82 is located along the sheet path upstream with respect to plenum 84 so that a sheet being moved along the portion of the path 26 leading from the tray to the registration member first comes under the influence of vacuum in the plenum 82 and then under the influence of vacuum from plenum 84.
  • the plenums are closely adjacent the lower reach of the belts 70 and 72 and the plenums have openings on the lower side thereof. When air is evacuated from the planums a partial vacuum is created in the plenums, and this partial vacuum is transferred through the openings in the bottom of the plenums and through the openings in the belts to attract a sheet to the belts.
  • Vacuum is provided by a single vacuum blower 86 (Fig. 2).
  • the inlet to the blower is connected to a T-shaped coupling 88.
  • One branch of the coupling is coupled by a conduit 90 directly to the second vacuum plenum 84.
  • a series of vents 92 are provided in conduit 90 so that when the blower is shut off the conduit 90 and plenum 84 will promptly return to atmospheric pressure. These vents also serve to limit the level of vacuum applied to the plenum 84.
  • Valve 94 has an inlet port 96 that is connected to another branch of the coupling 88 by a conduit 98. Valve 94 has two outlet ports 100 and 102. Outlet port 100 is coupled by a conduit 104 to the oscillating vacuum feeder 18.
  • a plurality of vents 106 allow the vacuum tube to return to atmospheric pressure when the blower 86 is stopped or the valve 94 shuts off communication between the blower and the vacuum feeder. These vents also serve to limit the level of the vacuum in the oscillating vacuum feeder.
  • a conduit 108 is coupled to the outlet port 102 of valve 94 and to. the first vacuum plenum 82. This conduit also has vents 110 therein for allowing the plenum 82 to return to atmospheric pressure and for limiting the level of vacuum applied to the plenum.
  • Control valve 94 preferably is operated by a solenoid 112 which is energized and deenergized by the control mechanism for the feeder.
  • the control mechanism may comprise for example, a logic and control unit (LCU) 113.
  • the valve has a lever 114 pivoted intermediate its ends.
  • Solenoid 112 has an armature connected to one end portion of the lever 114, and the other end portion of the lever is connected to a slider 116.
  • blower 96 is effective to provide a partial vacuum in the oscillating vacuum feeder 18 through the control valve 94 and conduit 104.
  • the blower also provides a partial vacuum in plenum 84 through conduit 90.
  • Conduits 90,104 and 108 can be provided with breakable couplings 120,122 and 124, respectively along the interface between the copier 14 and feeder 10. These couplings facilitate assembly and repair of the feeder.
  • plenum 82 is smaller than plenum 84. Also, a higher level of vacuum is established in plenum 82 than in plenum 84.
  • a principal function of plenum 82 is to lift the sheet from the platen onto the lower reach of belts 70 and 72. This function is more likely to be successfully accomplished by a relatively high level of vacuum.
  • a principal function of plenum 84 is to hold the sheet against the belts without damaging the leading edge of the sheet when it is driven against member 34. Once a sheet is tacked to the belts by plenum 82, a lower level of vacuum is needed to hold the sheet to the belts. Because the belts 70, 72 preferably continue to move after the leading edge of the sheet strikes member 34, the lower level of vacuum in plenum 84 allows slippage between the belts and the sheets without damaging the leading edge of the sheet.
  • LCU 113 is shown connected to solenoid 112. As is known in the art, the LCU can receive signals from various sensors in feeder 10 and copier 14 and furnish control signals to not only the solenoid 112 but also to blower 86, motor 80 and other parts of the feeder and copier to provide a controlled sequence of operations.
  • control valve 94 is in the position shown in Fig. 2, i.e., port 100 is open and port 102 is closed so that the vacuum blower 86 can provide a vacuum in the oscillating vacuum feeder and in vacuum plenum 84, but not to vacuum plenum 82.
  • Vacuum applied to the vacuum feeder 18 causes the lowermost sheet S in the tray 16 to be attracted to the ports 19 of the vacuum feeder.
  • the oscillating vacuum feeder rotates clockwise to partially withdraw the lowermost sheet S from the tray and to feed the leading edge of the sheet into the nip between the drive rollers 22 and the rings 24.
  • solenoid 112 of the control valve 94 is energized to move the slider 116 to its second position wherein port 100 is blocked, thereby allowing the oscillating vacuum feeder to return to atmospheric pressure. This releases the sheet from the oscillating vacuum feeder and allows it to be transported along the first portion of the feeder path by the rollers 22 and rings 24.
  • valve 94 When solenoid 112 is energized valve 94 connects the vacuum blower 86 to the first vacuum plenum 82 to establish a partial vacuum in that plenum.
  • the relatively high level of vacuum in the plenum 82 causes the sheet to be lifted up onto the belts and tacked to the belts.
  • the belts are being driven in a direction to advance the sheet along the platen towards the registration member 34.
  • the sheet travels beneath the first vacuum plenum 82 and ultimately is delivered into the area beneath the second vacuum plenum 84.
  • air is continuously evacuated from plenum 84 through conduit 90 and the blower 86, the level of vacuum in plenum 84 being somewhat lower than the level of vacuum in plenum 82.
  • solenoid 112 in valve 94 is deenergized to allow the slider 116 to return to the position illustrated in Fig. 2. This opens the valve to port 100 and closes the valve to port 102, thereby interrupting the flow of air from plenum 82 through the valve to the vacuum blower 86.
  • the vacuum in plenum 82 is vented through holes 110 so that the plenum promptly returns to substantially atmospheric pressure. At this time the sheet is transported under the influence of vacuum from plenum 84 only.
  • the lower level of vacuum in plenum 84 is sufficient to retain the sheet against the belts for movement across the platen and into engagement with the registration member 34.
  • the sheet leading edge strikes the registration member 34 with a relatively low force.
  • the sheet can be stopped by the registration member even though the belts continue to move toward the registration member, thereby allowing any misalignment of the sheet to be corrected by continued movement of the belts.
  • the relatively low force applied by the belts prevents any damage to the sheet.
  • the registration member is moved out of the path of the sheet and the sheet is advanced past the registration position and into the nip formed by rollers 36 and 38 under control of vacuum in plenum 84 and the movement of the belts 70 and 72.
  • the first sheet When the first sheet enters the nip between rollers 36 and 38, it is normally advanced through sheet path 40 and returned to tray 16 on top of any sheets remaining in the tray as previously explained.
  • the movable guide member 46 can be swung to its dotted line position to allow removal of the sheet along the path designated 52.
  • vacuum is again applied to the oscillating vacuum feeder 18. The vacuum thus applied attracts the leading edge of the second sheet in the stack to the oscillating vacuum feeder. Once the registration member is raised the oscillating vacuum feeder can be oscillated clockwise again to initiate feeding movement of the second sheet.
  • the registration member After the trailing edge of the first sheet passes the registration member, the registration member is returned to the position shown in solid lines in Fig. 1 so that it can be engaged by the second document sheet to register that sheet. The cycle is repeated as required until the document sheets have all been circulated one or more times for copying.
  • the level of vacuum in plenums 82 and 84 can be varied as required, depending upon the type and weight of document sheets to be handled.
  • 21 x 28 cm sheets of 6, 9, and 15 kilogram weight per thousand sheets can be transported with an initial vacuum level equal to about 2.5 cm water gauge in plenum 82 with an air flow rate of about 0.4 cubic meters per minute.
  • the level of vacuum in plenum 84 can initially be about 1.3 cm water gauge with an air flow rate of .09 cubic meters per minute.
  • plenum 82 preferably is smaller than plenum 84.
  • the apertures in the bottom of each plenum can comprise about 9.7 sq. cm.
  • the belts can be about 3.8 cm wide with .5 cm diameter holes therethrough arranged on 1.3 cm center lines in three staggered rows.
  • the ability of the first plenum 82 to pick up a sheet being moved across the platen can be improved by increasing the port area of the plenum to allow a greater air flow and thereby produce more lift.
  • the platen vacuum transport provides a high gripping and lift force in the area of the first vacuum plenum 82. This assures lifting of the sheet onto the belts and also prevents skew of the document sheet.
  • Fig. 3 illustrates an alternative vacuum system for use in the sheet feeding apparatus described above, and like reference numbers designate like parts. This vacuum system differs from that already described in that it includes a second control valve 123 connected as shown in the conduit 108 connecting valve 94 and plenum 82.
  • valve 123 operates under the control of LCU 113, and it comprises a solenoid 130 and a mechanical linkage 134 for controlling the position of a slider 128.
  • the purpose of valve 123 is to minimize vacuum line fluctuations caused by the opening and closing of valve 94. The elimination of such fluctuations enhances the reliable operation of the oscillating vacuum feeder 18.
  • control valves 94 and 123 are in their respective positions as shown in Fig. 3.
  • vent 125 of valve 123 is open and the plenum 82 is at atmospheric pressure.
  • ports 96, 100 are open and port 102 is closed.
  • the vacuum blower 86 is operated, a vacuum is established in feeder 18 and vacuum plenum 84.
  • the blower is started and vacuum is applied to the vacuum feeder 18. This causes the lowermost sheet S in the tray 16 to be attracted to the ports 19 of the vacuum feeder.
  • the oscillating vacuum feeder rotates clockwise to partially withdraw the lowermost sheet S from the tray and to feed the leading edge of the sheet into the nip between the drive rollers 22 and the rings 24.
  • solenoid 112 of the control valve 94 moves slider 116 to the left to block port 100, thereby allowing the oscillating vacuum feeder to return to atmospheric pressure. This releases the sheet from the oscillating vacuum feeder and allows it to be transported along the first portion of the feeder path by the rollers 22 and rings 24.
  • the oscillating vacuum feeder then rotated counterclockwise to its original position.
  • port 102 When port 100 of valve 94 is closed, port 102 is opened. Shortly after port 102 is opened, and before the sheet reaches a position under plenum 82, the LCU signals the solenoid 130 to move slider 128, thereby closing vent 122 and opening port 119 so that vacuum can be applied to plenum 82.
  • the leading edge of the sheet reaches the space beneath the lower reach of belts 70 and 72 and beneath the vacuum plenum 82
  • the relatively high level of vacuum in the plenum 82 lifts the sheet up against the belts and tacks the sheet to the belts.
  • the belts are being driven in a direction to advance the sheet along the platen towards the registration member 34.
  • the sheet travels beneath the first vacuum plenum 82 and ultimately is delivered into the area beneath the second vacuum plenum 84.
  • solenoid 130 drives the slider 128 back to the left as illustrated in Fig. 3. This closes the valve port 119 and opens the vent 122, thereby interrupting the flow of air from plenum 82 through the valves 123 and 94 to the vacuum blower 86.
  • This vacuum in plenum 82 is vented through vent 122 so that the plenum promptly returns to substantially atmospheric pressure.
  • the sheet is transported under the influence of vacuum from plenum 84 only.
  • the lower level of vacuum in plenum 84 is sufficient to retain the sheet against the belts during further movement across the platen and into engagement with the registration member 34.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Claims (8)

1. Un procédé pour avancer une feuille sur une trajectoire prédéterminée, en butée avec un organe de mise en repérage de feuille, à l'aide d'une courroie à dépression, caractérisé par les étapes suivant lesquelles on avance une feuille sur la trajectoire, on établit une dépression d'un premier niveau à travers la courroie pour plaquer la feuille sur la courroie à dépression et pour tirer la feuille sur la trajectoire, et on applique un dépression d'un deuxième niveau, plus bas, à travers la courroie pour transporter la feuille sur la trajectoire jusqu'à sa mise en butée avec l'organe de mise en repérage, de manière à autoriser un glissement relatif entre la feuille et la courroie.
2. Un procédé conforme à la revendication 1, caractérisé en ce que ces premier et deuxième niveaux de dépression sont appliqués à une feuille circulant sur ladite trajectoire de feuille, par l'intermédiaire de première et deuxième chambres à dépression distinctes, respectivement, ladite première chambre à vide étant disposée plus en amont de la trajectoire de feuille que ladite deuxième chambre à dépression, et caractérisé en outre en ce que la dépression appliquée à la chambre à dépression amont est commandée de manière à être privée d'effet à l'instant où la feuille atteint l'organe de mise en repérage.
3. Appareil d'alimentation en feuille comprenant un moyen de transport à dépression pour avancer une feuille sur une trajectoire prédéterminée jusqu'à un organe de feuille qui est agencé pour buter sur le bord d'attaque de la feuille qui s'avance pour supprimer toute inclinaison de la feuille sur sa trajectoire, le moyen de transport à dépression comprenant une courroie à dépression, des moyens d'entraînement pour avancer la courroie au long de la trajectoire, et un moyen à dépression pour plaquer des feuilles sur la courroie et pour tirer les feuilles sur la trajectoire, le moyen à dépression comprenant une source de dépression et un moyen de chambre à dépression raccordé à la source et adjacent à la courroie, caractérisé en ce que le moyen de dépression comprend un moyen de commande pour commander le niveau de dépression applicable à travers la courroie (70, 72) entre un premier niveau pour plaquer initialement une feuille sur la courroie (70, 72) et un deuxième niveau suffisant pour que la courroie (70, 72) entraine une feuille au contact de l'organe de mise en repérage (34) tout en autorisant un glissement relatif entre la feuille et la courroie (70, 72) une fois ce contact établi.
4. Un appareil conforme à la revendication 3, caractérisé en ce que le moyen de chambre à dépression comprend une première (82) et une deuxième chambre (84) sur lesquelles passe la courroie (70, 72), la première chambre (82), se trouvant en amont de la deuxième (84), en ce que le moyen de commande est agencé initialement pour appliquer la dépression du premier niveau à la première chambre (82), la dépression du deuxième niveau à la deuxième chambre (84), et, avant que la feuille ne touche l'organe de mise en repérage (34), pour supprimer la dépression du premier niveau dans la première chambre (82).
5. Un appareil conforme à la revendication 3 ou 4, caractérisé en outre en ce qu'un noyen d'alimentation (18) fonctionnant par dépression est prévu pour présenter des feuilles au transporteur à dépression, le moyen d'alimentation (18) étant couplé fonctionnellement à la source de dépression, et en ce que le moyen de commande de dépression fonctionne alternativement pour appliquer une dépression du premier niveau à travers la courroie (70, 72), et au moyen d'alimentation (18).
6. Un appareil conforme à la revendication 5, caractérisé en ce que le moyen de commande de dépression comprend une première vanne de commande pour régler le courant d'air du moyen d'alimentation (18) fonctionnant par dépression vers la source de dépression, la première vanne de commande étant munie d'un premier orifice d'entrée raccordé à la source de dépression, d'un premier orifice de sortie raccordé au moyen d'alimentation (18) et d'un deuxième orifice de sortie pour règler le courant d'air du moyen de chambre à dépression au premier niveau vers la source de dépression, et un organe de vanne pour raccorder alternativement l'orifice d'entrée au premier et deuxième orifice de sortie.
7. Un appareil conforme à la revendication 6, caractérisé en ce qu'une deuxième vanne de commande est connectée entre le deuxième orifice de sortie de la première vanne de commande et le moyen de chambre à dépression, la deuxième vanne de commande ayant une première position, alternée avec celle de la première vanne de commande raccordant l'orifice d'entrée au premier orifice de sortie, dans laquelle la dépression du premier niveau n'est pas appliquée au moyen de chambre à dépression, et une deuxième position, dans laquelle l'orifice d'entrée de la première vanne de commande est raccordée au deuxième orifice de sortie de celle-ci, de manière à appliquer, au moyen de chambre à dépression, une dépression du premier niveau.
8. Un appareil conforme à la revendication 6 ou 7, caractérisé en ce que le moyen de commande de dépression comprend en outre un moyen de commande et de logique relié fonctionellement à la première vanne de commande, ou aux première ou deuxième vannes de commande, pour régler le fonctionnement de la vanne, ou des vannes, suivant une séquence programmée actionnant la vanne, ou la première vanne, de manière à fournir une dépression au moyen d'alimentation pour amorcer la présentation d'une feuille au moyen de transport à dépression et actionnant ensuite la vanne, ou les première et deuxième vannes, pour couper l'alimentation du moyen d'alimentation avec une dépression et pour établir une dépression du premier niveau dans le moyen de chambre à dépression, de manière à plaquer une feuille sur la courroie pour que celle-ci puisse entraîner la feuille, suivie par l'arrêt de la fourniture de la dépression du premier niveau au moyen de chambre à dépression après que la feuille arrive sous l'influence de la dépression du deuxième niveau.
EP19820302794 1981-06-02 1982-05-28 Appareil pour l'alimentation en feuilles Expired EP0066471B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US26916981A 1981-06-02 1981-06-02
US269168 1981-06-02
US06/269,168 US4362380A (en) 1981-06-02 1981-06-02 Document feeder with vacuum system having two control valves in series
US269169 1981-06-02
US269167 1981-06-02
US06/269,167 US4421306A (en) 1981-06-02 1981-06-02 Document feeder with improved vacuum system

Publications (2)

Publication Number Publication Date
EP0066471A1 EP0066471A1 (fr) 1982-12-08
EP0066471B1 true EP0066471B1 (fr) 1985-04-10

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EP19820302794 Expired EP0066471B1 (fr) 1981-06-02 1982-05-28 Appareil pour l'alimentation en feuilles

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EP (1) EP0066471B1 (fr)
DE (1) DE3262961D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005047150A1 (fr) * 2003-11-17 2005-05-26 Silverbrook Research Pty Ltd Ensemble d'alimentation de support d'impression pour une imprimante

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169674A (en) * 1974-11-13 1979-10-02 Eastman Kodak Company Recirculating sheet feeder
GB1578119A (en) * 1977-02-18 1980-11-05 Drg Ltd Shingling device for use in machines for handling envelopes and the like flat flexible articles
JPS54115870A (en) * 1978-02-27 1979-09-08 Masaharu Matsuo Belt paper feeder
US4179215A (en) * 1978-07-24 1979-12-18 Eastman Kodak Company Recirculating document feeder
US4243316A (en) * 1979-07-25 1981-01-06 Eastman Kodak Company Registration mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005047150A1 (fr) * 2003-11-17 2005-05-26 Silverbrook Research Pty Ltd Ensemble d'alimentation de support d'impression pour une imprimante

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DE3262961D1 (en) 1985-05-15

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