EP0020976B1 - Vorrichtung zum Trennen des obersten Blattes von einem Blattstapel - Google Patents

Vorrichtung zum Trennen des obersten Blattes von einem Blattstapel Download PDF

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Publication number
EP0020976B1
EP0020976B1 EP19800102568 EP80102568A EP0020976B1 EP 0020976 B1 EP0020976 B1 EP 0020976B1 EP 19800102568 EP19800102568 EP 19800102568 EP 80102568 A EP80102568 A EP 80102568A EP 0020976 B1 EP0020976 B1 EP 0020976B1
Authority
EP
European Patent Office
Prior art keywords
shaft
follower
stack
sheet
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.)
Expired
Application number
EP19800102568
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English (en)
French (fr)
Other versions
EP0020976A1 (de
Inventor
Harrold Roger Woodard
Stephen Pope Garrison
Elmer Leroy Bob Kroeker
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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
Priority claimed from US06/053,647 external-priority patent/US4270745A/en
Priority claimed from US06/053,484 external-priority patent/US4272068A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0020976A1 publication Critical patent/EP0020976A1/de
Application granted granted Critical
Publication of EP0020976B1 publication Critical patent/EP0020976B1/de
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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
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0638—Construction of the rollers or like rotary separators
    • B65H3/0646—Wave generation rollers, i.e. combing wheels

Definitions

  • the present invention relates to devices for separating the upper sheet from a stack of sheets so that the sheets can be sent individually to the processing unit which can be, for example, a printer.
  • the present invention relates more particularly to sheet separation devices of the type causing an undulation of the upper sheets of the stack to allow their separate dispatch to the processing unit.
  • the principle of waving implies that by applying a circular element such as a ball or a roller on the surface of the top sheet of a stack of sheets and exerting only a minimum pressure sufficient to deform or push the upper sheets of the stack slightly under the circular element, then by driving said circular element longitudinally on the upper surface and more particularly in the case where the circular element turns freely, a slight offset of the upper sheet is created. the battery caused by the movement of the circular element.
  • a circular element such as a ball or a roller
  • This ripple is in fact transmitted to the edge of the stack of sheets and causes the offset of the upper sheets which have been slightly driven in by the roller. Once the sheets have been so shifted, it is easier to detach them from the top of the stack e, using the conventional sheet feeding devices of the prior art.
  • the circular member be moved away from the paper so as not to interfere with the removal operations. In the devices of the prior art, the operations for removing the circular element are ensured by a means which lifts said circular element and separates it from the stack of sheets.
  • corrugated sheet shift type gripping devices are the most significant features of the corrugated sheet shift type gripping devices.
  • the pressure is too low, there will be practically no sinking of the upper leaves and as a result, no ripple and no offset.
  • the pressure is too great, paper curl and damage can occur.
  • the present invention provides a device for shifting the upper sheets of a stack of sheets using ripple sheet separation means which maintains minimum uniform pressure on the surface of the upper sheet of the stack during shift operation.
  • the present invention also makes it possible to produce a wavy offset means which applies uniform pressure to the top sheet of the stack regardless of variations in the height of said stack.
  • the present invention also makes it possible to produce a wavy offset means which can be very easily released from the stack to allow the offset sheets to be removed.
  • a sheet separation device which comprises means carrying a stack of sheets and sheet separation means mounted adjacent to the stack and comprising a rotary shaft with a helical peripheral file and coaxial, a follower rotating around the shaft and following the helical thread to travel the length of said shaft, at least one circular element mounted on the follower and means for driving said shaft in rotation in one direction to drive said follower and said element circular against the top sheet of the stack to offset it from the rest of the stack.
  • the device further comprises means ensuring an instantaneous stop of the rotary shaft allowing the follower carrying said circular element to move along the shaft and to disengage from the surface of the upper sheet of the stack.
  • the circular element mounted on the follower rotates freely by means of ball bearings or rollers.
  • the present invention also makes it possible to produce a sheet separation device comprising means for supporting a first and a second stack of sheets and sheet separation means mounted adjacent to the stacks and comprising a rotary shaft of which a part has a first helical and coaxial peripheral thread and another part, a second helical and coaxial peripheral thread whose direction is opposite to that of the first thread.
  • a first and a second follower respectively, operate in association with said first and second threads and can be respectively and selectively brought into contact with the upper sheet of said first and second stacks according to the direction of rotation of the 'tree.
  • the rotation of the shaft in one direction causes the application of the rollers of the first follower on the first stack to shift the upper leaves of the latter in a direction, for example to the printer.
  • the rotation of the shaft in the opposite direction causes the application of the rollers of the second follower on the second stack to offset the upper sheets thereof in the other direction, for example by moving them away from the printer.
  • the stack of sheets 10 to be offset is placed in a tray 11 ( Figures 1 and 2).
  • Figure 2 several of the rollers 13 of the corrugated sheet separation means 12 facing the viewer have been removed to more clearly represent the drive.
  • the rollers 13 are mounted on a ring 14 so as to be able to rotate freely in said ring which is fixed to a hub or follower 15 which has an internal thread (not shown) engaged with the helical thread 16 of the shaft 17.
  • the housing 18 which is fixed to the chassis (not shown) of the device, carries the shaft 17 in the position shown and contains the drive means which drive the shaft 17 in rotation in the direction indicated by the arrows.
  • rollers 13 mounted in the crown 14 can be mounted on ball bearings so as to rotate freely therein as described in the patent FR-A-1,250,457 cited above.
  • their structure is similar to that shown in the Figures or to that described in the IBM Technical Disclosure Bulletins of January 1978, page 2933 and of July 1978, page 477; that is to say, it consists of several rollers rotating freely and mounted on the periphery of a rotary crown.
  • the follower 15 and the rollers 13 which it carries are kept at a certain distance above the stack of sheets 10.
  • means are provided for retaining the follower 15 on the shaft, above the stack 10.
  • magnetic means can be provided for magnetizing the plate 19 so that it biases and magnetically retains the upper surface 20 of the follower 15 while the shaft 17 is stopped. Then, in order to initiate the operation of shifting the upper leaves, the shaft 17 is driven in rotation at a speed sufficient to disengage the follower 15 from the magnetic grip of the plate 19 and allow its movement downward following the helical thread 16 of the shaft 17 until the rollers 13 carried by the rotary crown 14 bear successively on the upper sheet 21 of the stack 10 and ensure the offset of the upper sheets of the stack by causing them to undulate as described in the patent and the articles cited above.
  • This downward helical movement of the follower which brings it into contact with the stack of sheets is similar to that used in inertia starters in the automotive industry.
  • a pinion or follower is offset along a reinforcing shaft following a thread of the type for quick-tightening screws.
  • the rollers 13 can be easily disengaged from the top sheet 21 by abruptly stopping the rotation of the shaft 17. Then, the moment which has been allocated to the follower 15 is eliminated by driving the follower in upward rotation on the shaft 17, following the helical thread 16 until the top of said follower is again magnetically biased by the plate 19 to maintain the rollers 13 at a distance from the stack 10.
  • rollers 13 While the rollers 13 are kept away from the stack 10, one or more of the offset top sheets of the stack 10 can be removed by any conventional sheet handling means. Then the shaft 17 can be rotated again to bring the rollers 13 down against the top sheet of the stack remaining in the tray. Due to the nature of the helical drive mechanism, the rollers 13 will always apply the same pressure to the top sheet of stack 10 regardless of the height of said stack which decreases as sheets are shifted and removed. This is due to the fact that the pressure applied by the rollers 13 is mainly determined by a combination of factuers including the speed of rotation of the shaft, the mass of the crown, the angle of the propeller of the thread of the shaft and braking of the rollers 13, but in no case by the height of the stack of sheets.
  • the device of FIG. 3 is represented at a point in its operating cycle where the shift mechanism is in the intermediate position, that is to say that it neither bears on the battery 110 of the container 111 nor on the stack 130 of the tray 131.
  • the only instant when the follower is in the intermediate position of FIG. 3 corresponds to any intermediate point of transition between the rotation drive in one direction and the rotational drive in the other direction. In normal operation, it will be either the rollers 113 of the follower 115 which will bear on the stack 110, or the rollers 133 of the follower 135 which will bear on the stack 130 or else the two followers 115 and 135 will be in their high position, the shaft being stopped and the followers released from the piles of leaves.
  • Figures 3 and 4 show rollers 113 and 133 which are respectively mounted on the crowns 114 and 134 of the followers 115 and 135 so as to rotate freely in said crowns.
  • a first helical thread 116 machined in the periphery of the upper part of the shaft 117 is oriented in one direction while the second helical thread 136 machined in the lower part of the shaft 117 is oriented in the opposite direction.
  • the follower 115 has an internal thread (not shown) engaged with the first helical thread 116 of the shaft while the follower 135 has an internal thread (not shown) engaged with the helical thread 136 of the shaft.
  • the housing 118 fixed to the frame of the sheet separation device (not shown) carries the shaft 117 in the position shown and contains the drive means which drive the shaft 117 in rotation, either clockwise or in the counterclockwise as indicated by the arrows.
  • the rollers 113 and 133 respectively mounted in the crowns 114 and 134 can be carried by ball bearings so as to rotate freely in their crown as is the case in the embodiment previously described with reference to Figures 1 and 2.
  • Figure 4 shows the device in the initial or non-feeding position, i.e. the position in which no sheet is removed from either stack.
  • the followers 115 and 135 and their respective rollers 113 and 133 are kept at a certain distance above the stacks 110 and 130.
  • Means are provided for keeping the followers 115 and 135 in this position.
  • Magnetic means can be provided to magnetize the plates 119 and 139 so that they stress the upper surfaces 120 and 140 of the followers 115 and 135, respectively, and hold them in the high position while the shaft 117 is stopped (case of Figure 4).
  • the shaft 117 is rotated clockwise at a speed sufficient to disengage the follower 135 from the magnetic grip of the plate 139 and allow it to move downward along the helical thread 136 of the shaft until the rollers 133 mounted in the rotary crown 134 successively bear on the upper sheet 141 of the stack 130, as in Figure 5, in order to cause the ripple effect which shifts the upper sheets of the battery as described in the patent and the publications cited above.
  • the helical drive causing the follower movement 135 downwards and its application to the stack of sheets is similar to the drive used in inertia starters in the automotive industry.
  • a pinion or follower is offset along a reinforcement shaft by following a thread of the quick-tightening screw type.
  • the rollers 133 can be easily released from the top sheet 141 by stopping suddenly the rotation of the shaft 117. Then, the moment which has been given to the follower 135 is eliminated by driving the follower in upward rotation, on the shaft 117, following the helical thread 136, until that the top of the follower is again magnetically biased by the plate 139 to keep the rollers 133 away from the stack 130.
  • rollers 133 While the rollers 133 are kept away from the stack 130, one or more of the offset top sheets can be removed from the stack by any conventional sheet handling means. Then the shaft 117 can again be rotated clockwise to bring the rollers 133 down against the top sheet of the stack 130 remaining in the tray if one wishes to continue feeding the machine with sheets of the stack 130. Due to the nature of the helical drive mechanism, the rollers 133 will always exert the same pressure on the stack of sheets 130 regardless of the height of said stack 130 which decreases as the sheets are shifted and removed, as already explained in relation to the embodiment shown in Figures 1 and 2.
  • the clockwise rotation of the shaft 117 is stopped as described above, then the shaft 117 is driven in rotation counterclockwise as shown in Figure 6.
  • the shaft rotates at a speed sufficient to disengage the follower 115 from the magnetic grip of the plate 119 and allow its movement down along the helical thread 116 of the 'shaft until the rollers 113 carried by the rotary crown 114 successively urge the upper sheet 121 of the stack 110 to offset the upper sheets of the stack causing their undulation.
  • the rollers 113 can be easily disengaged from the upper sheet 121 as previously indicated, abruptly stopping the rotation of the shaft 117.
  • rollers 113 While the rollers 113 are kept away from the stack 110, one or more of the offset sheets can be removed by any conventional sheet handling means. Then, the shaft 117 can be rotated again to bring the rollers 113 down against the top sheet of the stack remaining in the tray. Due to the nature of the helical drive mechanism, the rollers 113 will always apply the same pressure to the top sheet of the stack 110 regardless of the height of said stack which decreases as sheets are shifted and removed as indicated above.
  • the threaded shafts 16, 116 are slightly inclined relative to the vertical, these shafts could be oriented perpendicular to the plane of the sheets: it would then suffice that the rollers 13, 113 are carried by arms extending downward from the crowns 14,114,134.

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

Claims (11)

1. Vorrichtung zum Trennen des obersten Blattes (21) von mindestens einem Blattstapel (10), bestehend aus
einem Behälter (11) zur Aufnahme des Blattstapels,
einer Trennvorrichtung (13, 14, 15), die mit dem ersten Blatt (21) des Stapels in Eingriff gelangen kann und aus einer um ihre Achse drehbaren zylindrischen Welle (17) besteht, mindestens einem auf der Welle angebrachten Folgeelement (14, 15) und mindestens einem auf dem Folgeelement angebrachtes Drehelement (13), sowie einer Antriebsvorrichtung (18) zum Antrieb der Trennvorrichtung,
dadurch gekennzeichnet, daß:
die zylindrische Welle (17) wenigstens einen Gewindeabschnitt (16) aufweist,
das Folgeelement (14, 15) eine Nabe mit Innengewinde aufweist, die auf dem Gewindeabschnitt der Welle angebracht ist, um mit diesem in der Art eines Schrauben-Muttersystems in Eingriff zu gelangen, und daß die Antriebsvorrichtung einen Antrieb (18) zum Drehen der Welle in einer bestimmten Richtung aufweist, damit das Folgeelement sich unter dem Einfluß seiner Trägheit längs der Welle in einer ersten Richtung bewegt, bis das Drehelement mit dem ersten Blatt des Stapels in Berührung kommt, um es zu verschieben, und dann die Drehung der Welle anzuhalten, so daß sich das Folgeelement in der entgegengesetzten Richtung bewegt und sich das Drehelement vom obersten Blatt abhebt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Folgeelement außerdem einen Ring (14) aufweist, auf dessen Umfang sich eine Vielzahl von frei drehbaren Elementen (13) befindet.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß:
sie ein Halteelement (19) einschließt, die das Folgeelement und die Drehelemente vom ersten Blatt des Stapels entfernt hält, solange die Welle nicht in Drehung versetzt ist, wobei
die Kraft, die von der Antriebsvorrichtung ausgeübt wird, wenn sie die Welle in Drehbewegung versetzt, gnügt, um sich der von dem Halteelement auf das Folgeelement ausgeübten Kraft zu widersetzen.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Halteelement ein Magnetelement darstellt.
5. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Welle (17) mit der Ebene der Blätter einen wenig unter 90 Grad liegenden Winkel bildet.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Behälter (11) waagerecht angeordnet ist.
7. Vorrichtung zum Trennen des obersten Blattes (121, 141) von einem von zwei Blattstapein (110, 130), dadurch gekennzeichnet, daß sie enthält:
einen ersten und einen zweiten Behälter (111, 131) zur Aufnahme der beiden Blattstapel,
eine zylindrische, um ihre Achse drehbare Welle (117) mit einem ersten und einem zweiten, entgegengesetzt verlaufenden Gewinde (116,136),
erste und zweite jeweils mit einem Innengewinde versehene Folgeelemente (115, 135), die auf dem ersten bzw. dem zweiten Gewindeteil der Welle angeordnet sind, um mit diesen in der Art eines Schrauben-Muttersystems in Eingriff zu kommen,
wenigstens ein auf jedem Folgeelement angebrachtes Drehelement (113,133),
eine Antriebsvorrichtung (118) zum Drehen der Welle in einer ersten Richtung, so daß sich das erste Folgeelement (115) unter dem Einfluß seiner Trägheit entlang der Welle in einer ersten Übertragungsrichtung bewegt, bis das Drehelement (114) des ersten Folgeelementes das oberste Blatt (121) des ersten Stapels berührt und mit diesem in Eingriff kommt, um es zu verschieben und dann die Wellendrehung anzuhalten, so daß das erste Folgeelement sich in einer der Übertragungsrichtung entgegengesetzten Richtung bewegt und so sein Drehelement vom obersten Blatt des ersten Stapels abhebt, und
einen Antrieb zur Drehung der Welle in entgegengesetzter Richtung, so daß das zweite Folgeelement (135) sich unter dem Einfluß seiner Trägheit in der der Übertragungsrichtung entgegengesetzten Richtung entlang der Welle bewegt, bis das Drehelement (134) des zweiten Folgeelementes das oberste Blatt (141) des zweiten Stapels berührt und mit diesem in Eingriff kommt, um es zu verschieben und dann die Drehung der Welle anzuhalten, so daß das zweite Folgeelement sich in der ersten Übertragungsrichtung bewegt und sein Drehelement sich vom obersten Blatt des zweiten Stapels abhebt.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß alle Folgeelemente (115, 135) einen Ring (114, 134) aufweisen, auf dessen Umfang sich eine Vielzahl von sich frei drehenden Elementen (113,133) befindet.
9. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß
sie ein erstes und ein zweites Halteelement (119, 139) einschließt, die jeweils die ersten und zweiten Folgeelemente und die Drehelemente vom ersten Blatt des ersten und des zweiten Stapels fernhalten, solange die Welle nicht in Drehung versetzt wird, und
daß die Kraft, die von der Antriebsvorrichtung ausgeübt wird, wenn sie die Welle in der einen oder anderen Richtung in Drehbewegung versetzen, genügt, um sich der von den Halteelementen auf die Folgeelemente ausgeübten Kraft zu widersetzen.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Halteelemente Magnetelemente darstellen.
11. Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß:
der erste und der zweite Behälter (111, 131) waagerecht angeordnet sind, und daß die Welle mit der Ebene der Blätter einen Winkel bildet, der ein wenig unterhalb 90 Grad liegt.
EP19800102568 1979-06-29 1980-05-09 Vorrichtung zum Trennen des obersten Blattes von einem Blattstapel Expired EP0020976B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/053,647 US4270745A (en) 1979-06-29 1979-06-29 Multiple stack roll-wave sheet separator apparatus
US53484 1979-06-29
US06/053,484 US4272068A (en) 1979-06-29 1979-06-29 Roll-wave sheet separator structure
US53647 1979-06-29

Publications (2)

Publication Number Publication Date
EP0020976A1 EP0020976A1 (de) 1981-01-07
EP0020976B1 true EP0020976B1 (de) 1983-01-19

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ID=26731919

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Application Number Title Priority Date Filing Date
EP19800102568 Expired EP0020976B1 (de) 1979-06-29 1980-05-09 Vorrichtung zum Trennen des obersten Blattes von einem Blattstapel

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EP (1) EP0020976B1 (de)
DE (1) DE3061669D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3706533A1 (de) * 1986-06-16 1988-01-21 Babcock Anlagen Ag Verfahren zur ueberfuehrung von barium aus schwerspat in eine waessrige loesung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1250457A (fr) * 1959-10-02 1961-01-13 Ibm Appareil destiné à la séparation et à l'entraînement de feuilles

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Publication number Publication date
EP0020976A1 (de) 1981-01-07
DE3061669D1 (en) 1983-02-24

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