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
  • 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
  • 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
  • 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 present invention relates to a device for separating sheets of paper by blowing air in a vertical friction sorter, comprising a plurality of stations arranged above each other, each one of which is 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.
• friction sorters 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.
• 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.
• 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.
• the object of the present invention is to solve the problem discussed above of electrostatic charging of sheets in friction sorters.
• 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.
• the sheet will not be drawn over the subjacent sheet, whereby charging of the sheet is avoided.
• the risk of a plurality of sheets mistakenly being picked simultaneously is decreased.
• 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.
• 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.
• 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.
• 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 ques- tion, 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.
• 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.
• the fans are individually controllable for each station.
• Figures 1 and 2 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 exhaust opening 7 of the nozzle 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 the sheets 1 are separated.
• the opening 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.
• an equally great flow is not needed to hold already separated sheets spaced-apart by air films.
• Separate fans 3 are, as has been described above, arranged in each sta- tion 8 of the sorter. In this way, it is easier to maintain equally great air pressure and equally great air flow in each station 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.
• 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 the stations 8 contain sheets 1 of different types.

Landscapes

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39636208

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (4)

• 2007
  • 2007-01-18 SE SE0700106A patent/SE530791C2/sv 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

Patent Citations (4)

Non-Patent Citations (1)

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