US3635464A - Sheet-stripping device in printing presses - Google Patents

Sheet-stripping device in printing presses Download PDF

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Publication number
US3635464A
US3635464A US884970A US3635464DA US3635464A US 3635464 A US3635464 A US 3635464A US 884970 A US884970 A US 884970A US 3635464D A US3635464D A US 3635464DA US 3635464 A US3635464 A US 3635464A
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United States
Prior art keywords
stripper
sheet
fin
cap
stripping device
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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
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US884970A
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English (en)
Inventor
Otto Gramlich
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.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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    • 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
    • B65H3/56—Elements, e.g. scrapers, fingers, needles, brushes, acting on separated article or on edge of the pile

Definitions

  • Sheet-stripping device for printing press having means for pneumatically raising the uppermost sheet of a supply stack at a leading edge thereof includes a plurality of strippers disposed between vertically extending and horizontally spaced ABSTRACT stop members for the supply stack, the strippers, respectively,
  • a rodlike holder having a free upper end, and a removable cap of elastic material mounted on the free end of the holder, the cap having at least one stripper fin extending toward the supply stack and projecting over the uppermost sheet of the supply stack.
  • press stoppages are caused by the fact that one or even more sheets remain adhered to the raised sheet and can be fed-with the latter into the press.
  • two different measures have been adopted. In one case, blower nozzles have been placed in front of the supply stack for effecting a fanning out of the uppermost sheet from the remaining sheets of the supply stack and, in the other case, the aforementioned strippers have been provided between the forward paper stop members with which the leading edge of the supply stack comes-into contact.
  • a stripper must obviously grip the sheet gently so that no damage occurs to the leading edge of the sheet even when the paper is relatively thin; but on the other hand, the stripper fin of the stripper must sweep along the leading edge of the raiseduppermost sheet with adequate firmness so as to strip away reliably therefrom any other sheets adhering thereto.
  • a stripper'fin must accordingly be extremely elastic. In spite of its flexibility, however, it must have adequate durability to avoid a sudden press stoppage due to failure or fracture thereof. It is obvious, of course, that there is no way of preventing such stripper fins from gradually wearing out and from requiring replacement. Therefor, a relatively simple means of replacing wom-out stripper fins is of great advantage.
  • the exchangeability of the stripper fins is of importance because a stripper fin of specific structure does not work equally efiectively for all paper thicknesses. It is therefore-desirable to have a timesaving means for adapting or adjusting the type of stripper fin tothe variety of paper that is to be worked on.
  • a heretofore known stripper is formed of a flat bar having about a 2 to 3 mm. right-angle bend at the upper end thereof, and a second shorter bar that is fastened to the upper end of the first-mentioned bar.
  • a strip of rubber or plastic material is inseparably and consequently nonexchangeably clamped between both bars.
  • the upper end of this strip isbent at right angles away from the angled end of the first mentioned bar, so that an elastic tongue is formed which projects over the stack of printed sheets (Swiss Pat. No. PS 460,060).
  • sheet-stripping device for printing presseshaving means for pneumatically raising the uppermost sheet of a sheet supply stack at a leading edge thereof comprising aplurality of strippers disposed between vertically extending and horizontally spaced stop members for the sheet supply stack, the strippers respectively, comprising a rodlike holder having a free upper end and a removable cap of elastic material mounted on the free-endof the holder, the cap having at least one stripper fin extending toward the supply stack and projecting over the uppermost sheet of the supply stack.
  • the elastic cap constructed in accordance with my invention is exchangeable very rapidly and effortlessly so that a printer can employ, with little loss of time and relatively low cost, the particular type of stripper fin, which is most suitable,
  • FIG. I is an elevational view of the sheet stripper of my invention, installed in a sheet stacking device for a printing press; 1 1
  • FIG. 2 is a sectional view of FIG. I taken along the line H- II in the direction of the arrows, and showing a sheet supply stack with the topmostsheet thereof raised by a pneumatic gripper or sucker,
  • FIG. 3 is a top plan view of FIG. 1.
  • FIGS. 4A,4B and 4C are front elevational, side and top plan views respectively, of a particular embodiment of the cap.
  • This known stripping device is advantageously employable for a relatively great range of paper types and thicknesses, yet is not v equally efficacious for the extremes of paper thicknesses, namely cardboard and tissue.
  • This known device has a particular shortcoming, however, in that after the stripper tongue has become worn, in addition to the elastic strip, the entire holder with the stripper fin firmly fastened thereto, must also be replaced. The replacement of the whole holder and stripper is uneconomical and is burdened with unnecessary costs since only the worn stripper fin really has to be exchanged.
  • FIGS. 7A, 7B and 7C are views also corresponding to those of FIGS. 4A, 4B and 4C, respectively, of a further embodiment of the cap member of my invention.
  • FIGS. I to 3 there is shown therein a traverse or crosspiece I on which vertically extending stop members 2 are secured for guiding the leading edge of the sheets in a supply stack 3.
  • Sheet snippets 4 are fastened to the traverse I inthe spaces between adjacent stop members 2 by means of clamping screws 5.
  • Each stripper 4 is formed of a holder 6 and a stripper cap 7.
  • the lower'end of the holder 6, as viewed in FIG. I, for example, is formed with a slot 8 through which the clamping screw 5 extends.
  • the cap 7 is formed of elastic material, such as rubber or a suitable plastic material, and is formed at the lower end thereof, as viewed in FIG. '2, for example, with a slot-shaped hollow space 9 wherein the upper end 10 of the holder 6 is inserted, each stripper 4 extends into a recess ll of a blower device 12 which is located at the level of the upper sheets I4 of the supply stack 3.
  • the upper end of the stripper cap 7, as viewed in FIG. 2, for example, is provided with a right-angle bent tongue or stripper fin 13 having a free outer end which projects over the leading edge of the supply stack 3 and is located above the uppermost sheet 14.
  • the spacing between the stripper fin l3 and the respective uppermost sheet 14 of the supply stack 3 can be adjusted by loosening the clamping screw 5 and shifting the entire stripper 4 in vertical direction. This adjustment is also attainable, however, by mutually exchanging stripper caps 7 of varying lengths. In this case, adjusting the level of the holder in the slot 8, is dispensed with.
  • the level adjustment of the stripper fin I3 is generally dependent upon the thickness of the paper sheets being processed.
  • a suction rod with a plurality of conventional suckers 16 are located above the sheet supply stack 3 so as to raise the respective uppermost sheets from the supply stack 3 at the leading edge thereof, and to further transport it in a conventional manner over the feed table in direction toward the printing mechanism.
  • FIGS. 4A, 4B and 4C show elevational, side and plan views, respectively of an embodiment of a stripper cap 7 formed of rubber or plastic material.
  • the underside of the stripper fin 13a is provided with stripper studs 17.
  • the fin 13a proper is exceptionally flexible, being of very thin construction.
  • This kind of stripper cap 7 is suited especially for thicker types of paper, for example, for strong art or coated paper or stiff cardboard.
  • the great flexibility of the stripper fin 13a is necessary to prevent the stifi' material from being torn off by the suckers 16.
  • the roughened or studded undersurface or edge of the stripper fin 13a of FIGS. 4A, 4B and 4C rubs with sufficient vigor along the leading edge of the raised sheet or sheets 14 so that sheets adhering to the uppermost raised sheet are stripped off therefrom and drop back downward on the supply stack 3.
  • FIGS. 5A, 5B and 5C there is shown a stripper cap 7, also made of rubber or plastic material, which has stripper fins 13b formed with parallel notches 18 therein, so that the stripper fin 13b has the appearance of a comb.
  • This type of stripper fin 13b is particularly suited for very thin sheets, suchasairmail tissue or the like.
  • the individual stripper fingers formed between the notches 18 are flexible and cause no damage to the edges of the sheets but nevertheless rub against the leading edge of the thin sheet fed past them and consequently, strip off therefrom any possible adhering sheets, which thereupon drop back onto the supply stack.
  • FIGS. 6A, 6B and 6C show a stripper cap 7 with bristles 19, for example of hair or nylon, inserted at one -end thereof, and serving as a stripper fin.
  • this stripper fin can be used for thin or thick types of paper.
  • FIGS. 7A, 7B.and 7C there is shown an attachable cap 7 having a stripper fin 13c formed of a very thin leaf spring 20 bent into a right-angle shape, one of the legs of which is embedded in the elastic material of the cap 7 and extends in the longitudinal direction thereof.
  • the operation of the aforedescribed stripper device of my invention is as follows:
  • the stripper fin 13 of the stripper 4 is located at such a distance above the leading edge of the supply stack 3 that the respective uppermost sheet 14 raised by the suckers l6 rubs, with the leading edge thereof, along the underside of the elastic stripper fin 13.
  • a second sheet is suspended from or adheres to the upper sheet held by the suckers 16. by suitably adjusting the stripper, the second sheet is stripped off the sheet 14 that is to be further transported to the printing mechanism, and the second sheet accordingly drops back onto the supply stack 3.
  • a stripper cap 7 with stripper fins as that of FIGS. 4A, 4B and 4C, may be advantageously used therefor.
  • stripper cap with stripper fins such as those of FIGS. 5, 6 and 7.
  • the exchange of the stripper caps is rapidlyaccomplished by pulling off the previously used stripper cap from the respective holder6 (FIG. 1 for example) and mounting on the latter the new stripper cap that is to be used. Only in exceptional cases is any subsequent vertical adjustment of the entire stripper 4 necessary, in case caps of the same height or length are used. The adjustment is unnecesary if caps of varying length or height are mutually exchanged.
  • Sheet-stripping device for printing press having means for pneumatically raising the uppermost sheet of a supply stack at a leading edge thereof comprising a plurality of strippers disposed between vertically extending and horizontally spaced stop members for the supply stack, said strippers, respectively, comprising a rodlike holder havinga free upper end, and a cap of elastic material-formed with a longitudinal .recex wherein said free end of said holder is received, said cap being slidingly removable from said free end of said holder, said cap having at least one stripper fin extending toward the supply stack for projecting over the uppermost sheet of the supply stack.
  • stripper fin is integral with said cap and extends therefrom at a i right is 3. Sheet-stripping device according to claim 2, wherein said stripper fin is fonned with a roughened undersurfaoe.
  • Sheet-stripping device according to claim 1, wherein said stripper fin comprises a plurality of elastic bristles secured to said cap and extending at right angles therefrom.
  • stripper fin comprises an elastic fin partially embedded in said cap and having a right-angle bend formed therein.
  • Sheet-stripping device according to claim 1, wherein said cap is formed of material selected from the group, of elastic materials consisting of rubber-and elastic plastic material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US884970A 1968-12-23 1969-12-15 Sheet-stripping device in printing presses Expired - Lifetime US3635464A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1816491 1968-12-23

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US3635464A true US3635464A (en) 1972-01-18

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US (1) US3635464A (en))
AT (1) AT296350B (en))
CH (1) CH506428A (en))
DE (1) DE1816491B1 (en))
FR (1) FR2026943A1 (en))
GB (1) GB1244280A (en))
NL (1) NL141149B (en))
SE (1) SE375286B (en))

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218055A (en) * 1977-11-07 1980-08-19 Agfa-Gevaert, A.G. Apparatus for singularizing stacked dielectric receptor sheets for latent images
US4382593A (en) * 1980-08-04 1983-05-10 International Business Machines Corporation Vacuum document feeder
US5171007A (en) * 1991-07-23 1992-12-15 N & A Custom Metal Service, Inc. Sheet feeding device having an adjustable sheet restrainer
US5451041A (en) * 1993-05-06 1995-09-19 Heidelberger Druckmaschinen Ag Sheet feeder of a printing press
US5818508A (en) * 1995-10-06 1998-10-06 Gerber Systems Corporation Imaging device and media handling apparatus
WO2005047151A1 (en) * 2003-11-17 2005-05-26 Silverbrook Research Pty Ltd Print media sheet separating arrangement for a printer
CN110621441A (zh) * 2017-05-16 2019-12-27 豪迈股份公司 给料装置和给料方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560155A (en) * 1982-12-02 1985-12-24 De La Rue Systems Limited Sheet feeding apparatus with sheet separator
DE4033870A1 (de) * 1990-10-22 1992-04-23 Aristo Graphic Systeme Einrichtung zum vereinzeln von blaettern eines blattstapels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696755A (en) * 1925-04-01 1928-12-25 New Jersey Machine Corp Gumming machine
US2293046A (en) * 1941-02-08 1942-08-18 Addressograph Multigraph Sheet separating mechanism
CH460060A (de) * 1968-02-10 1968-07-31 Honegger Hans Abstreifeinrichtung zum Trennen der Druckbogen für Schnelldruckpressen mit pneumatischer Druckbogeneinführungseinrichtung
US3403903A (en) * 1967-04-17 1968-10-01 Jesse W. Crail Torsion bar sheet separator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696755A (en) * 1925-04-01 1928-12-25 New Jersey Machine Corp Gumming machine
US2293046A (en) * 1941-02-08 1942-08-18 Addressograph Multigraph Sheet separating mechanism
US3403903A (en) * 1967-04-17 1968-10-01 Jesse W. Crail Torsion bar sheet separator
CH460060A (de) * 1968-02-10 1968-07-31 Honegger Hans Abstreifeinrichtung zum Trennen der Druckbogen für Schnelldruckpressen mit pneumatischer Druckbogeneinführungseinrichtung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218055A (en) * 1977-11-07 1980-08-19 Agfa-Gevaert, A.G. Apparatus for singularizing stacked dielectric receptor sheets for latent images
US4382593A (en) * 1980-08-04 1983-05-10 International Business Machines Corporation Vacuum document feeder
US5171007A (en) * 1991-07-23 1992-12-15 N & A Custom Metal Service, Inc. Sheet feeding device having an adjustable sheet restrainer
WO1993002006A1 (en) * 1991-07-23 1993-02-04 N & A Custom Metal Services, Inc. Improved sheet feeding device
US5451041A (en) * 1993-05-06 1995-09-19 Heidelberger Druckmaschinen Ag Sheet feeder of a printing press
US5818508A (en) * 1995-10-06 1998-10-06 Gerber Systems Corporation Imaging device and media handling apparatus
WO2005047151A1 (en) * 2003-11-17 2005-05-26 Silverbrook Research Pty Ltd Print media sheet separating arrangement for a printer
CN110621441A (zh) * 2017-05-16 2019-12-27 豪迈股份公司 给料装置和给料方法

Also Published As

Publication number Publication date
FR2026943A1 (en)) 1970-09-25
SE375286B (en)) 1975-04-14
CH506428A (de) 1971-04-30
NL141149B (nl) 1974-02-15
AT296350B (de) 1972-02-10
GB1244280A (en) 1971-08-25
DE1816491B1 (de) 1970-03-12
NL6913421A (en)) 1970-06-25

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