EP0190612B1 - Dispositif de prise d'une feuille au moyen d'une ventouse - Google Patents

Dispositif de prise d'une feuille au moyen d'une ventouse Download PDF

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Publication number
EP0190612B1
EP0190612B1 EP86100842A EP86100842A EP0190612B1 EP 0190612 B1 EP0190612 B1 EP 0190612B1 EP 86100842 A EP86100842 A EP 86100842A EP 86100842 A EP86100842 A EP 86100842A EP 0190612 B1 EP0190612 B1 EP 0190612B1
Authority
EP
European Patent Office
Prior art keywords
film
suction
sheet
leading edge
lip
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
EP86100842A
Other languages
German (de)
English (en)
Other versions
EP0190612A2 (fr
EP0190612A3 (en
Inventor
Walter Bauer
Johann Zanner
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
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
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of EP0190612A2 publication Critical patent/EP0190612A2/fr
Publication of EP0190612A3 publication Critical patent/EP0190612A3/de
Application granted granted Critical
Publication of EP0190612B1 publication Critical patent/EP0190612B1/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
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0883—Construction of suction grippers or their holding devices

Definitions

  • the invention relates to a device for removing a sheet of film from an X-ray film cassette or an X-ray sheet film magazine or the like, the sheet film to be removed being drawn by at least one suction device near an end face of the film to be lifted by means of a curved suction lip inner surface into which a suction line opens and which is partially rotationally symmetrical, preferably frustoconical , is suckable.
  • DE-U-1 676 130 and US-A-3 552 741 have disclosed suction devices for lifting a top sheet from a stack of paper. They are based on the principle of shaking off or underneath the sheet to be separated by shaking off the sheets below. From DE-U-1 676 130, for example, a suction nozzle is known for this purpose, which has a wavy fillet in the area of the main suction line, which is inclined towards the stack 2 towards the side of the sheet edge and is provided with at least one auxiliary suction hole and whose part facing away from the arch edge is arched. In order to increase the shaking effect on the sheets lying under the sheet to be separated, the suction nozzle can also be set up to tilt. In addition, a truncated cone-shaped suction lip can be placed over this suction nozzle.
  • suction devices which are suitable for paper sheets, are unsuitable for separating sheet films because, on the one hand, a crumple effect in X-ray films is unsustainable, the relatively very rigid and heavy sheet films also resist crushing sufficient to shake off the film underneath, and because of their smooth surfaces they are much more likely to collapse stick as sheets of paper or the like. If a rigid, corrugated suction nozzle is attached, there would also be a risk of scratching the film surface. The addition of a suction lip would not eliminate these undesirable effects, and an additional tilting or shaking function would only lead to damage to the rigid, heavy sheet film.
  • the invention is based on the object of improving a device of the type mentioned in such a way that the lifting of the sheet film to be lifted takes place in such a way that air can flow in between it and the subsequent film and accelerate the detachment of the subsequent film or the base, so that a safe separation takes place with simple means before the sheet film to be conveyed is lifted off.
  • the features of the invention surprisingly achieve that a sheet film to be lifted is first sucked into the partially cylindrical curvature and only then fully sucked in, that a top sheet film to be lifted is thus forced inside the suction lip of the sucker to have a small barrel-like curvature, the longitudinal axis of which is perpendicular to the film front edge and runs to the axis of the suction line and extends to the edge of the film or stack edge.
  • This barrel-like curvature thus forms a channel running perpendicular to the front edge of the film, through which air flows very quickly between the sheet film to be lifted and the sheet underneath (further sheet film, reinforcing film, cassette bottom).
  • This inflowing air immediately breaks the suction between the sheet to be lifted and its base, so that a safe and quick separation between them is ensured with the simplest means before lifting the sheet film to be lifted.
  • Fig. 1 denotes a storage film cassette, as z. B. is required in X-ray film cassette loading devices for the supply stack.
  • a film stack with 2 the first sheet 4 of which is raised by two suction devices 3 of a suction device (not shown in greater detail), one in the transport direction below in front of the Sheet stack 2 arranged stop bar with 5 and transport rollers designated 6.
  • the transport rollers 6 lie in the transport direction in front of the stop bar 5.
  • Two limit bars 7 are arranged on the side of the stack 2 in connection with the stop bar 5 and keep the stack 2 aligned.
  • the suction cups 3 first lift the top sheet 4 perpendicular to the stack 2, so that it slides up on the stop bar 5, in order to then lift it over the stop bar 5 and feed it to the transport rollers.
  • the cassette floor area is designated 8.
  • Each sucker 3 has suction lips 3a, the inner surface of which is rotationally symmetrical, preferably frustoconical, and merges into the mouth 9a of a suction line 9 in its highest area as seen from the film.
  • the suction lips 3a can have annular grooves 3b or thinnings along at least one outer circumferential line in order to further increase their elasticity, which has already been increased by thinning at the edge, and thereby improve application to a film 4 to be lifted off and its suction, as is shown in FIG. 4 is particularly clearly recognizable.
  • suction cups suck a sheet to be lifted dome-shaped and approximately symmetrical to the axis of the suction line mouth 9a, so that additional rotary or tilting movements of the suction cup were necessary to shake off a sheet adhering to the sheet to be lifted off.
  • complicated mechanical control devices are required, which the present innovation is intended to avoid while improving the effect.
  • the inner surface 3c of the squeegee has, in a region near the mouth of the suction line 9a, a surface piece 10 which deviates from a truncated cone surface and has an axis perpendicular to the front edge 4a of the film, which is recessed upwards relative to a sheet to be lifted off or forms a depression upwards . It is thereby achieved that the film surface under the suction device 3 is no longer domed, but rather barrel-like, the longitudinal axis of this barrel-like curvature being directed towards the film front edge 4a. These relatively narrow barrel-like arches extend because of their proximity to the front edge 4a and are designated by 4b in FIGS. 1 and 2.
  • the surface piece 10 is formed by a cylinder inner surface piece cut with the frustoconical suction lip inner surface 3c, the surface lines 10a of which are shorter than the largest inner suction lip diameter 3d.
  • the surface lines 10a run perpendicular to the film front edge 4a.
  • a barrel-shaped or cylindrical curvature 4b corresponding to the shape of the cylindrical surface piece 10 is forced on the sheet film 4 which is sucked in, which continues to the edge 4a of the film, so that air flows in between the sucked-in film 4 and the underlying surface parts 2 and becomes detached, possibly adhering Documents.
  • a chord 12 running through the suction line opening 9a parallel to the film front edge 4a between the most distant points of the cylindrical surface piece 10 is greater than the length of its surface lines.
  • the curvature of the cylinder piece 10 receives a proportion which is particularly favorable for the formation of the barrel-shaped curvature 4b.
  • the new suction training is advantageously applicable for singling film stacks, for. B. in sheet film storage magazines. However, it can also be used just as advantageously when removing a single film from a film cassette, because the film adhering to an intensifying film or cassette wall also easily detaches. It can be advantageous if the lip of the suction lip has a small recess 3d at a location not immediately adjacent to the film front edge 4a, which then makes it easier to detach the suction device 3 if, instead of a sheet film to be lifted off, with a cassette or magazine already empty, the intensifying film or sucks the cassette bottom or magazine bottom 8.
  • This recess 3d is so far out that it does not affect the desired suction, but that with a slight lifting of the suction device at this recess 3d air can be let in under the suction device, so that the suction device 8 can be detached from solid documents.

Landscapes

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

Claims (3)

1. Dispositif servant à prélever un film en feuille (4), suivant le cas dans une cassette de films radiographiques (1) ou dans un magasin de films radiographiques en feuille ou analogues, le film à prélever pouvant être aspiré par un extracteur (3) au moins, à proximité d'une arête frontale (4a) du film à soulever, au moyen d'une surface intérieure cintrée des lèvres d'aspiration (3c), dans laquelle débouche une conduite d'aspiration (9) et qui, à symétrie partielle de révolution, est de préférence de forme tronconique, caractérisé en ce que la surface intérieure des lèvres d'aspiration (3c) approche de l'entrée (9a) de la conduite d'aspiration (9) et est formée, dans un secteur proche de l'entrée de la conduite d'aspiration, par une portion de surface intérieure cylindrique circulaire (10) découpée par la surface à symétrie de révolution, tronconique de préférence, de la surface intérieure des lèvres d'aspiration, portion dont les génératrices (10a) sont plus petites que le plus grand diamètre (3e) des lèvres d'aspiration et sont perpendiculaires à l'arête frontale (4a) du film.
2. Dispositif selon la revendication 1, caractérisé en ce qu'une corde (12) traversant l'entrée (9a) de la conduite d'aspiration parallèlement à l'arête frontale (4a) du film, entre les points de la portion de surface (10) les plus éloignés, est plus grande que la longueur des génératrices (10a) de celle-ci.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'un évidement (3d) plat est prévu dans le bord des lèvres d'aspiration (3a), à un emplacement opposé à l'arête frontale (4a) du film.
EP86100842A 1985-02-02 1986-01-22 Dispositif de prise d'une feuille au moyen d'une ventouse Expired EP0190612B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853503622 DE3503622A1 (de) 1985-02-02 1985-02-02 Vorrichtung zum entnehmen eines blattfilms mittels eines saugers
DE3503622 1985-02-02

Publications (3)

Publication Number Publication Date
EP0190612A2 EP0190612A2 (fr) 1986-08-13
EP0190612A3 EP0190612A3 (en) 1988-01-07
EP0190612B1 true EP0190612B1 (fr) 1989-03-15

Family

ID=6261541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100842A Expired EP0190612B1 (fr) 1985-02-02 1986-01-22 Dispositif de prise d'une feuille au moyen d'une ventouse

Country Status (3)

Country Link
US (1) US4979729A (fr)
EP (1) EP0190612B1 (fr)
DE (2) DE3503622A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083764A (en) * 1990-07-16 1992-01-28 E. I. Du Pont De Nemours And Company Suction cup for curling a sheet near its edge and method of use
DE19628943C2 (de) * 1996-07-18 1999-10-21 Roland Man Druckmasch Sauger
DE102004014635B4 (de) 2004-03-22 2006-01-19 J. Schmalz Gmbh Sauggreifer
US20070138733A1 (en) * 2005-12-16 2007-06-21 Chris Gray Pick mechanism

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE291957C (fr) *
US783206A (en) * 1904-03-02 1905-02-21 Charles A Juengst Sucker device for signature or sheet gathering machines.
US1448690A (en) * 1922-02-18 1923-03-13 Paul C Hetzer Vacuum cup
DE1676130U (de) * 1954-02-02 1954-05-13 Mabeg Maschb G M B H Saugduese.
US2850279A (en) * 1954-03-29 1958-09-02 Miehle Goss Dexter Inc Sheet separator
US3154306A (en) * 1962-10-29 1964-10-27 Harris Intertype Corp Sheet-gripping sucker
US3230002A (en) * 1963-04-22 1966-01-18 Hyster Co Suction cup construction and apparatus
US3272549A (en) * 1965-01-13 1966-09-13 Gen Electric Materials handling device
US3552741A (en) * 1968-07-26 1971-01-05 Harris Intertype Corp Sheet gripping means
DE1946361A1 (de) * 1969-09-12 1971-04-08 Adnumat Geraetebaugmbh & Co Saugerkopf
US3724687A (en) * 1971-03-26 1973-04-03 Marguip Inc Panel board feeding apparatus
DE2633831C2 (de) * 1976-07-28 1978-09-07 Vits-Maschinenbau Gmbh, 4018 Langenfeld Sauger zum Anheben von biegsamen Gegenständen mit flacher Oberfläche, insbesondere Bogen aus Papier oder Folie
US4420150A (en) * 1979-12-19 1983-12-13 Ricoh Company, Ltd. Apparatus and method for separating a single sheet from a stack and conveying it
US4591140A (en) * 1983-03-12 1986-05-27 Agfa-Gevaert Aktiengesellschaft Arrangement for separating and transporting uppermost sheets of a stack of sheets or sheet-like objects
US4589648A (en) * 1984-10-22 1986-05-20 Westvaco Corporation Pinch-action suction cup

Also Published As

Publication number Publication date
DE3662381D1 (en) 1989-04-20
DE3503622A1 (de) 1986-08-07
EP0190612A2 (fr) 1986-08-13
DE3503622C2 (fr) 1987-11-26
EP0190612A3 (en) 1988-01-07
US4979729A (en) 1990-12-25

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