EP2107995B1 - Device for separating sheets of paper by blowing air - Google Patents
Device for separating sheets of paper by blowing air Download PDFInfo
- Publication number
- EP2107995B1 EP2107995B1 EP08705322.9A EP08705322A EP2107995B1 EP 2107995 B1 EP2107995 B1 EP 2107995B1 EP 08705322 A EP08705322 A EP 08705322A EP 2107995 B1 EP2107995 B1 EP 2107995B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheets
- pile
- separating device
- nozzle
- sheet separating
- 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.)
- Active
Links
- 238000007664 blowing Methods 0.000 title claims description 7
- 238000010276 construction Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000007786 electrostatic charging Methods 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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
- B65H3/00—Separating articles from piles
- B65H3/44—Simultaneously, alternately, or selectively separating articles from two or more piles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H1/00—Supports or magazines for piles from which articles are to be separated
- B65H1/04—Supports or magazines for piles from which articles are to be separated adapted to support articles substantially horizontally, e.g. for separation from top of pile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
- B65H3/48—Air blast acting on edges of, or under, articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2405/00—Parts for holding the handled material
- B65H2405/30—Other features of supports for sheets
- B65H2405/33—Compartmented support
- B65H2405/332—Superposed compartments
-
- 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
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/12—Means using fluid made only for exhausting gaseous medium producing gas blast
- B65H2406/121—Fan
Definitions
- the height of the exhaust opening 7 of the nozzle exceeds the height of the outlet 6 from the proper fan, see Figure 5 .
- the exhaust opening 7 is furthermore widened in the upper part thereof. In this way, the exhausted air will also be directed outward toward this part that is above the outlet 6 of the proper fan, since the flow resistance is lower in said widened part of the nozzle than in the central, narrower part. Thus, as a result, an air curtain is obtained, the height of which exceeds the height of the proper fan outlet 6.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Description
- The present invention relates to a sheet separating device for a vertical friction sorter, the vertical friction sorter comprising a plurality of stations arranged above each other, each one of which comprises a sheet separating device and a storage surface intended to contain a pile of sheets of paper lying on each other, individual sheets being intended to be picked from the stations in a predetermined way for further processing. The invention also relates to such a friction sorter.
- There are essentially two types of sorters for use for after-treatment of sheets of paper in printing machines and copiers, viz. friction sorters and vacuum sorters. In friction sorters, individual sheets are picked from piles of sheets by the fact that a rotary feeding roll is abutted against and pulls the top sheet from the pile, wherein a subjacent friction block normally retains subjacent sheets of the pile. Friction sorters are robust and in general reliable in operation, but occasion- ally more than one sheet at a time may happen to be picked mistakenly. The feeding rolls may also leave marks in the sheets. In vacuum sorters, sheets are picked from piles by the fact that the top sheet of the pile is sucked against a conveyor belt for transportation of the sheet to subsequent further processing. The vacuum sorter has not the disadvantages mentioned above of the friction sorter, but the function thereof is more sensitive and a vacuum sorter is considerably more expensive than a friction sorter.
- Another disadvantage of friction sorters is that when picking sheets, the top sheet is drawn against the closest subjacent sheet of the pile, the picked sheet being electrostatically charged, which often gives rise to problems in after-treat- ment steps. The sheets namely get a tendency to stick to each other as a consequence of the electrostatic charge, which hampers, e.g., putting together and adjustment of sheets into a sheaf having straight edges in a stapling and folding machine when stapling together the sheaf for the formation of a booklet. Since colour printing and colour copying have become more and more common, the described problem of electrostatic charging of the sheets has become even greater, since coloured paper has a greater tendency to be charged than paper with black-and-white print.
- In large copiers and printing machines, it is previously known to separate sheets of paper in the paper magazines of the machines by blowing air from the side through the magazine. In doing so, air is supplied through central supply ducts to exhaust nozzles at the magazine or the magazines from a central fan unit situated at a distance from the magazine or the magazines.
-
US 2004/0178557 is a prior art document which describes a sheet feeding apparatus according to the preamble ofclaim 1 and which includes a sheet feeding roller that comes in contact with stacked sheets and feeds sheets one by one from the top, wherein an air outlet is provided so that air can be blown onto the upper part of the stacked sheets from the lateral side in the sheet feeding direction, and a floatation suppression member for suppressing floatation of the sheet is provided between the air outlet and the feeding roller and spaced apart from the uppermost surface of the stacked sheets. -
US 5,499,806 is another prior art document which describes a collating machine which comprises a frame, a plurality of superposed trays in the frame in order to be loaded with stacks of paper. Each tray being fitted with an individual sheet ejection device and a transfer device, and a vertical conveyor adjacent to the transfer devices of the trays to receive, and sheets are ejected from their trays and to move the same to a collating station. The ejection device comprises several endless perforated tapes carried on two spaced bend rolls and a vacuum chamber surrounded by the tapes and having apertures, for the passage of air, distributed in its lower wall which is adjacent to the internal surface of the lower run of the tape. The opposite surface of the lower run of the tape is positioned opposite to the top sheet in the stack in parallelism to the latter and at a distance which is maintained essentially constant by a moving plate carrying the stack. - The object of the present invention is to solve the problem discussed above of electrostatic charging of sheets in friction sorters.
- This object is attained by a device of the type indicated by way of introduction having the features defined in
claim 1, and a vertical friction sorter according toclaim 7. - Thus, by means of the present invention, a pre-separation of the sheets in the stations is provided by blowing air, so that when the top sheet of a pile is to be picked, it does not abut against, but it is separated from the subjacent sheet by an air film. Thus, in the picking operation, the sheet will not be drawn over the subjacent sheet, whereby charging of the sheet is avoided. In addition, the risk of a plurality of sheets mistakenly being picked simultaneously is decreased. By arranging separate fans in each station of the sorter, the construction becomes considerably simpler than if the exhaust air would be supplied from a central fan unit to each station through central supply ducts having appurtenant, requisite valve or trap devices. In addition, with a central air supply, there would be problems to provide the same pressure and the same air flow at the different stations, since the air supply ducts would become relatively long in high friction sorters having many stations. Simple and inexpensive fans, without any valve or trap arrangements, can be used in the device according to the invention, which makes the construction as a whole simple and inexpensive. In this way, friction sorters equipped with the device according to the invention will also be useful within areas and for applications where one hitherto has been reduced to use the considerably more complicated and more expensive vacuum sorters. Thanks to the specially formed nozzle, an efficient separation is achieved no matter how high the stack of sheets is.
- According to an advantageous embodiment of the device according to the invention, in each station, two fans are arranged at opposite sides of the storage surface for the stack of sheets. In this way, a very efficient separation of the sheets is achieved.
- According to another advantageous embodiment of the device according to the invention, the fans are mounted in lateral stops of the storage surface in each station. By mounting the fans directly in the lateral stops, a simple and efficient construction is obtained. According to yet another advantageous embodiment of the device according to the invention, the height of the exhaust opening of the nozzle exceeds the height of the outlet from the proper fan, and the exhaust opening of the nozzle widens in the upper part of the nozzle. By this design of the opening of the nozzle, an air curtain is obtained, the height of which exceeds the height of the outlet from the proper fan. Thus, by the fact that the exhaust opening of the nozzle has a restriction in the intermediate portion thereof, the exhaust air will also be directed outward toward the widened upper part of the opening that is above the height of the outlet from the proper fan. Furthermore, in fans of the type in question, in which air is sucked axially into the fan and is exhausted radially, the air flow tends to vary over the height of the exhausted air curtain. By forming the nozzle such as has been indicated, also a correction of this effect is achieved.
- According to an additional advantageous embodiment of the device according to the invention, the exhaust opening of the nozzle widens in the lower part of the nozzle. A stronger air flow is namely required at the lower part of the stack of sheets in order to there bring about the initial separation of the sheets of the pile in an efficient way. In the upper part of the pile, there is only required that already separated sheets henceforth are kept separated by intermediate air films. To this end, a lower air flow is sufficient. According to yet another advantageous embodiment of the device according to the invention, the fans are individually controllable for each station. By making the fans individually controllable, suitably by providing each fan with its own electrical supply, the air flow can easily be adapted to, e.g., the weight of the sheets, which may vary from station to station if the stations contain sheets of different types. Such an individual control of the air flow to the individual stations would be very complicated in a construction having a central, constant air supply. Complicated, continuously controllable trap and valve arrangements would be required, not only for individually increasing and decreasing the air flow through the individual air gaps but also to compensate for the effect that, when the air flow through certain nozzles is restricted, the flow through other nozzles increases as a consequence of the central air supply being constant.
- The invention also relates to a friction sorter according to the type indicated by way of introduction and comprising a device of the above-mentioned type for separating sheets of paper by blowing air. In order to explain the invention further, an embodiment of the device according to the invention chosen as example will now be described more in detail, reference being made to the appended drawings, in which
Figures 1 and2 show in a front view and in a side view, respectively, the principal structure of a vertical or standing friction sorter provided with the device according to the invention,Figure 3 principally illustrates feeding out or picking of sheets from a pile of sheets in a station in a sorter according toFigures 1 and2 ,Figure 4 is a view from above of a station in the friction sorter, andFigure 5 is a detailed picture illustrating an example of the design of the exhaust nozzle in the device according to the invention. -
Figures 1 and2 show an embodiment of a vertical friction sorter from the front and in a side view, respectively, which is provided with a device according to the invention. - The machine comprises a plurality of
stations 8 arranged above each other and resting on acontrol cubicle 10 containing the other equipment of the machine, seeFigures 1 and2 . Eachstation 8 is intended to house a pile ofsheets 1 of paper lying on each other, shown in thetop station 8 inFigure 1 . Eachstation 8 comprises a paper magazine having astorage surface 2 on which the pile of sheets rests, see alsoFigure 3 . From the paper magazines,sheets 1 are fed out or are picked, one at a time, usingfeeding rolls 5 that are brought into frictional engagement with thetop sheet 1 of the pile, such as shown inFigure 3 . - In
Figure 2 , operating devices for the control of the machine are also shown, in the form of anLCD screen 11 for displaying miscellaneous information about the operation of the machine as well as a number of control buttons. In each station, twofans 3 are arranged at opposite sides of thestorage surface 2 for the stack of sheets. Thefans 3 are mounted directly inlateral stops 4 of thestorage surface 2 of each station, seeFigure 4 . - Each
fan 3 is provided with a nozzle having a slot-shaped exhaust opening 7 substantially vertical or orientated substantially perpendicularly to the storage surface, seeFigure 5 , for blowing a substantially vertical air curtain through the stack of sheets so as to separate thesheets 1 of the pile. This is illustrated inFigure 3 . Then, thesheets 1 are spaced-apart by an air film. Thus, when thetop sheet 1 of the stack of sheets is picked using thefeeding roll 5, the sheet will not be drawn over the closest subjacent sheet, thereby avoiding that the sheet is charged electrostatically with the accompanying drawbacks discussed above. - The exhaust opening 7 of the nozzle, see
Figure 5 , is formed as a slot that is standing or orientated perpendicularly to the storage surface in order to generate a substantially vertical air curtain. The height of the air curtain considerably exceeds the maximum allowed height of an unblown stack of sheets resting on the storage surface of the station, since the height of the pile increases when air is blown toward the pile and thesheets 1 are separated. - Therefore, the height of the exhaust opening 7 of the nozzle exceeds the height of the
outlet 6 from the proper fan, seeFigure 5 . Theexhaust opening 7 is furthermore widened in the upper part thereof. In this way, the exhausted air will also be directed outward toward this part that is above theoutlet 6 of the proper fan, since the flow resistance is lower in said widened part of the nozzle than in the central, narrower part. Thus, as a result, an air curtain is obtained, the height of which exceeds the height of theproper fan outlet 6. - Such a design of the
nozzle opening 7 also gives another favourable effect. In the used type of fans, air is sucked into the fan axially and is exhausted radially. Such fans tend to generate an exhaust flow that varies over the height of the air curtain. By the described design of thenozzle opening 7, a certain correction of this effect is also obtained, so that an essentially equally strong flow is obtained along the entire height of the air curtain. - As is seen in
Figure 5 , theopening 7 of the nozzle is widened also in the lower part thereof. A greater air flow is namely desirable in the lower part in order to efficiently bring about the initial separation of the sheets in the lower part of the stack of sheets. In the upper part of the pile, an equally great flow is not needed to hold already separated sheets spaced-apart by air films. - The hourglass-like design of the
nozzle opening 7 having a restriction in the intermediate part of theopening 7 is also seen fromFigure 3 . -
Separate fans 3 are, as has been described above, arranged in eachstation 8 of the sorter. In this way, it is easier to maintain equally great air pressure and equally great air flow in eachstation 8 than in a construction having a central fan unit that feeds all stations via ducts provided with valves or traps, such as has been discussed above. By furthermore arranging thefans 3 individually controllable, suitably by providing eachfan 3 with its own electrical supply, the air flow can easily be adapted to, e.g., the weight of the sheets in the individual stations. This is important, since the weight of the sheets may vary from station to station if thestations 8 containsheets 1 of different types.
Claims (7)
- Sheet separating device for a vertical friction sorter, the vertical friction sorter comprising a plurality of stations (8) arranged above each other, each one of which comprises a sheet separating device and a storage surface (2) intended to contain a pile of sheets (1) of paper lying on each other, one sheet (1) at a time being intended to be picked from the stations (8) in a predetermined order for further processing, each sheet separating device comprises at least one fan (3) arranged beside the storage surface (2) for the pile of sheets (1) for blowing air essentially horizontally through the pile in order to separate sheets (1) of the pile, each fan (3) being provided with a nozzle having a slot-shaped exhaust opening (7), characterized in that the exhaust opening (7) is orientated substantially perpendicularly to the storage surface (2) for blowing a substantially vertical air curtain through a pile of sheets (1) lying on the storage surface (2), which exhaust opening (7) is formed to generate an air curtain, the height of which exceeds the maximum allowed height of the pile of sheets (1) lying on the storage surface (2).
- Sheet separating device according to claim 1, characterized in that, in each station (8), two fans (3) are arranged at opposite sides of the storage surface (2) for the pile of sheets (1).
- Sheet separating device according to claim 1 or 2, characterized in that the fans (3) are mounted in lateral stops of the storage surface (2) in each station (8).
- Sheet separating device according to any one of claims 1-3, characterized in that the height of the exhaust opening (7) of the nozzle exceeds the height of the outlet from the proper fan (3), and that the exhaust opening (7) of the nozzle widens in the upper part of the nozzle.
- Sheet separating device according to any one of claims 1-4, characterized in that the exhaust opening (7) of the nozzle widens in the lower part of the nozzle.
- Sheet separating device according to any one of the preceding claims, characterized in that the fans (3) are individually controllable for each station (8).
- Vertical friction sorter, comprising a plurality of stations (8) arranged above each other, each one of which is intended to contain a pile of sheets (1) of paper lying on each other, one sheet (1) at a time being intended to be picked from the stations (8) in a predetermined order for further processing, characterized in that the machine comprises a sheet separating device according to any one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0700106A SE530791C2 (en) | 2007-01-18 | 2007-01-18 | Device for separating sheets of paper by blowing air |
PCT/SE2008/050050 WO2008088286A1 (en) | 2007-01-18 | 2008-01-17 | Device for separating sheets of paper by blowing air |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2107995A1 EP2107995A1 (en) | 2009-10-14 |
EP2107995A4 EP2107995A4 (en) | 2014-08-06 |
EP2107995B1 true EP2107995B1 (en) | 2016-12-14 |
Family
ID=39636208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08705322.9A Active EP2107995B1 (en) | 2007-01-18 | 2008-01-17 | Device for separating sheets of paper by blowing air |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2107995B1 (en) |
SE (1) | SE530791C2 (en) |
WO (1) | WO2008088286A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE539502C2 (en) * | 2014-03-24 | 2017-10-03 | Plockmatic Int Ab | Device and method of paper feeding and paper processing machine |
SE539680C2 (en) * | 2016-04-01 | 2017-10-31 | Plockmatic Int Ab | Device for feeding papers |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4306684A (en) * | 1979-12-04 | 1981-12-22 | American Can Company | Low noise air nozzle |
DE3834400A1 (en) * | 1988-10-10 | 1990-04-19 | Heidelberger Druckmasch Ag | LAXING BLOWERS FOR BOW FEEDERS OF BOW ROTARY PRINTING MACHINES |
FR2703670B1 (en) * | 1993-04-07 | 1995-06-16 | Bourg Christian | SHEET ASSEMBLY WITH SUPERIMPOSED BOXES. |
JP3592275B2 (en) * | 2001-08-29 | 2004-11-24 | コニカミノルタホールディングス株式会社 | Paper feeder |
-
2007
- 2007-01-18 SE SE0700106A patent/SE530791C2/en unknown
-
2008
- 2008-01-17 EP EP08705322.9A patent/EP2107995B1/en active Active
- 2008-01-17 WO PCT/SE2008/050050 patent/WO2008088286A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
SE530791C2 (en) | 2008-09-16 |
SE0700106L (en) | 2008-07-19 |
EP2107995A1 (en) | 2009-10-14 |
WO2008088286A1 (en) | 2008-07-24 |
EP2107995A4 (en) | 2014-08-06 |
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