US3617048A - Vacuum paper feeder - Google Patents

Vacuum paper feeder Download PDF

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Publication number
US3617048A
US3617048A US29403A US3617048DA US3617048A US 3617048 A US3617048 A US 3617048A US 29403 A US29403 A US 29403A US 3617048D A US3617048D A US 3617048DA US 3617048 A US3617048 A US 3617048A
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US
United States
Prior art keywords
paper
vacuum
fingers
support
movable
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 - Lifetime
Application number
US29403A
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English (en)
Inventor
Donald J Albert
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3617048A publication Critical patent/US3617048A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B65H3/0891—Generating or controlling the depression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0212—Circular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0237—Multiple lifting units; More than one suction area
    • B66C1/0243—Separate cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/02—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by suction means
    • B66C1/0256—Operating and control devices

Definitions

  • a series of sets of vacuum fingers are provided for feeding sheets seriatim from a stack.
  • the stack is positioned on a paper support with movable side guides for positioning sheets of one of several preselected widths to be picked up by the vacuum fingers.
  • Solenoid valves interconnect the vacuum fingers with a source of vacuum and are operated in response to the position of the side guides so that only those sets of fingers which are operative to engage sheets of the width of the paper on the support have a vacuum applied thereto.
  • This invention relates to a paper feeder and more particularly to a vacuuin paper feeder for feeding paper seriatim from one of several preselected widths of paper.
  • copy sheets are typically seriatim from a supply, such as a stack of copy sheets, to a printing or transfer position where an image is placed on the copy sheets.
  • Copy sheets are fed from the top of the stack by means of vacuum fingers which pick up the top sheet and feed it to a transfer means, such as feed rollers, which feed the sheet to a transfer station.
  • a paper support for supportingthe supply of paper is normally provided with adjustable side guides for holding sheets of different selected width and length.
  • Vacuum pickup fingers are provided with valves which may be closed to shut off the vacuum source to fingers which are not used for the narrower widths of paper.
  • Such vacuum fingers are shown in US. Pat. No. l,575,892 toAshby; U.S. Pat. No.
  • a support for supporting a stack of one of several sheet sizes.
  • the support has movable sheet-positioning means for positioning the stack below a plurality of vacuum fingers which are mounted for movement toward and away from the support to feed sheets seriatim to suitable paper transport means.
  • the vacuum fingers are connected to a source of vacuum. Valves are interposed between some of the fingers and the vacuum source and are controlled in response to movement of the sheet-positioning means to provide vacuum at. those fingers which are to be brought into engagement with the sheets but not to provide vacuum to those vacuum fingers which will not come into engagement with the sheets.
  • the invention contemplates the provision of a paper support having adjustable side guides which are interconnected by a rack and pinion arrangement so that upon adjustment of one side guide, the opposite side guide is also adjusted.
  • Several sets of movable vacuum fingers are provided above the support and are movable into engagement with the uppermost sheet of the stack to lift the sheet from the stack and feed it to suitable paper transport means.
  • a first set of vacuum fingers engages the narrowest width paper whereas the next wider width paper is engaged by both the first set of vacuum fingers and a second set of vacuum fingers.
  • An additional set of vacuum fingers is provided for each wider width of paper.
  • Each set of vacuum fingers, except for the first set of vacuum fingers is provided with a vacuum control valve which interconnects the vacuum fingers with a vacuum source.
  • the vacuum control valves are respectively connected to switches positioned under the paper support.
  • the switch which is connected to the valve for the second set of fingers is located so as to be operated upon positioning of the side guides to receive paper of the next wider width.
  • Each of the other switches are positioned across the bottom of the paper support from the switch for the next narrower width at a distance equal to one-half the difference in width between the width of paper for which it is to be operated and the next narrower width.
  • One of the paper guides is provided with one or more permanent magnets thereon positioned to operate the respective switches at the appropriate positions of the paper guides.
  • the magnets Upon movement of the adjustable side guides, the magnets will operate the appropriate switches for the vacuum control valves so that vacuum is supplied from the vacuum source to those vacuum fingers only which are to come in contact with the selected paper width. It is apparent that by one single, simple operation the paper-feeding device may be adjusted to handle a different size paper. Thus, the operator need only move one of the side guides which in turn moves the other side guide to the proper position and causes adjustment of the valves so that only those vacuum fingers which will come in contact with the paper supply to be placed in the paper-feeding apparatus will have vacuum supplied thereto.
  • FIG. 1 is a top plan view of the paper-feeding device constructed in accordance with this invention.
  • FIG. 2 is a section, taken along line 2-2 of FIG. 1, with parts omitted for clarity of illustration, showing further details of the paper feeding device;
  • FIG. 3 is a fragmentary section, taken along line 33 of FIG. 1, showing a rack and pinion arrangement for adjusting the side guide;
  • FIG. 4 is a schematic circuit diagram which can be used with the valves of FIGS. 1 and 2.
  • a paper-feeding device which includes a paper support 2 for supporting stacks of paper of predetermined width between adjustable side guide 4 which is movable in slot 5 and adjustable side guide 6 which is movable in slot 7.
  • an end guide 8 is adjustable in slot 9 to the length of copy paper, such as a stack 10, as illustrated.
  • the apparatus is adapted to feed an intermediate width copy paper 12 as indicated in dotted lines in FIG. I and the narrow width copy paper 14, also indicated in dotted lines in FIG. 1.
  • the copy paper is fed seriatim by a vacuum pickup device 16 and fed to a sheet-transport device such as opposed feed rollers 18 and 20, best seen in FIG. 2.
  • the vacuum pickup device includes a plurality of sets of pickup fingers, such as pickup finger set 22 which includes a pair of pickup fingers 24 and 25 for feeding a narrow sheet of paper 14; a pickup finger set 26 which includes pickup fingers 28 and 29, which together with pickup finger set 22, feed sheets 12 of intermediate width; and pickup finger set 30 which includes fingers 32 and 33, which together with sets 22 and 26, feed wide copy sheets 10 through the feed rollers 18 and 20.
  • pickup finger set 22 which includes a pair of pickup fingers 24 and 25 for feeding a narrow sheet of paper 14
  • pickup finger set 26 which includes pickup fingers 28 and 29, which together with pickup finger set 22, feed sheets 12 of intermediate width
  • pickup finger set 30 which includes fingers 32 and 33, which together with sets 22 and 26, feed wide copy sheets 10 through the feed rollers 18 and 20.
  • pickup finger set 22 which includes a pair of pickup fingers 24 and 25 for feeding a narrow sheet of paper 14
  • pickup finger set 26 which includes pickup fingers 28 and 29, which together with pickup finger set 22, feed sheets 12 of intermediate width
  • pickup finger set 30 which includes fingers 32 and 33, which
  • pickup finger set 26 is connected to tee 34 through a solenoid valve 38 whereas pickup finger set 30 is connected to tee 34 through a solenoid valve 40, which solenoid valves are adapted to be closed when the paper to be fed is not wide enough to be engaged by the vacuum fingers of the respective sets.
  • side guide 4 is provided with a rack 42 extending below support 2
  • side guide 6 is provided with a similar rack 44, extending parallel to rack 42.
  • racks engage opposite sides of a pinion 46 which is illustrated in FIG. 3 as being rotatably mounted below support 2 by means of a screw 48 extending through a bearing 50 which is held in place by a washer 52.
  • one of the side guides such as side guide 4 is provided with an arm 54 extending under support 2 and having a pair of spaced pennanent magnets 56 and 58 which are spaced apart along arm 54 so as to control valves 38 and 40 in response to the position of the side guides, as more fully described below.
  • a pair of switches 60 and 62 are illustrated as being attached to the bottom of support 2 above the path of arm 54 and are spaced a distance apart equal to one-half the difference in width of the two paper widths for which they are to be used.
  • the switches could be mounted on a frame member (not shown) spaced below support 2.
  • These switches are connected in series with solenoid valves 38 and 40, respectively, which are connected to a power source 64, as shown in FIG. 4.
  • magnet 56 will be positioned under switch 62 to cause solenoid valve 40 to shut ofi" the vacuum to vacuum finger set 30 since this finger set would not be used with intermediate size paper 12.
  • lf support 2 is movable from a storage position in which the support is filled with a supply of paper to the work position shown in the drawings, it may be desirable to provide a memory circuit so that upon adjusting of the side guides while the tray in the storage position a signal will be provided to the memory circuit which in turn will provide a signal to the solenoid valves upon positioning of the tray in the work position.
  • a signal upon adjusting of the side guides while the tray in the storage position a signal will be provided to the memory circuit which in turn will provide a signal to the solenoid valves upon positioning of the tray in the work position.
  • three sets of fingers and three sizes of paper have been illustrated it will be understood that a lesser or greater number of sets of fingers and sizes of paper can be accommodated by providing an appropriate number of switches and magnets for the additional sizes.
  • a paper-feeding device which can accommodate any one of several widths of copy paper.
  • paper-positioning means such as side guides
  • sets of vacuum fingers for the different sizes of paper can be controlled so that vacuum is provided only to these fingers which will come in contact with the size paper positioned on the support. This is accomplished by providing spaced magnets on at least one of the side guides which are positionable under one or more switches in accordance with movement of the side guides to provide a control signal to solenoid valves which interconnects the respective sets of vacuum fingers with a vacuum supply.
  • Apparatus for feeding sheets seriatim from one of a plurality of stacks of sheets of varying width positionable in said apparatus comprising:
  • a sheet support having a first side for supporting any one of the plurality of stacks of sheets at a time
  • valve means interconnecting at least one of said fingers with said vacuum supply means and movable between an open position wherein vacuum is supplied to said finger and a closed position in which vacuum is not supplied to said finger;
  • movable sheet-positioning means movable along a path for positioning one of said stacks of sheets on said support
  • valve means for controlling said valve means in response to movement of said sheet-positioning means so that vacuum is supplied only to those fingers which are engageable with a stack of sheets positioned on said support.
  • control means includes:
  • said positioning means includes:
  • At least first and second side guides on said support movable toward and away from each other to center a stack of paper thereon;
  • a pinion rotatably mounted on said second side of said support and engageable by both of said racks so that upon movement of one of said side guides in a first direction the other of said guides is moved correspondingly in an opposite direction to said first side guide.
  • a paper-feeding apparatus for feeding copy sheets seriatim from one of a plurality of stacks of paper of narrow, intermediate or wide width positionable in said apparatus, said device comprising:
  • a paper support having a top side for supporting any one of the plurality of stacks of paper at a time
  • first and second sets of vacuum fingers movable together toward and away from said support for engaging said copy sheets to feed them seriatim from a stack on said support;
  • a first control valve movable between an open and closed position and interconnecting said second set of fingers to said vacuum supply means
  • movable paper-positioning means for positioning a stack of any one of said narrow, intermediate or wide width copy paper on said support
  • a paper-feeding apparatus as claimed in claim 4, further including:
  • first and second control means which include said moving means, said first control means being responsive to a position of said positioning means for holding said intermediate width paper to close said second control valve to shut off vacuum to said third set of vacuum fingers and said first and second control means being responsive to a position for holding said narrow width paper in said positioning means to close said first and second control valves to shut off vacuum to said second and third sets of vacuum fingers, respectively.
  • each of said control valves further include:
  • first and second solenoids for moving said first and second control valves respectively
  • first and second switches below said support and connected in circuit, respectively, with said first and second control valves and spaced from each other a distance equal to one-half the difference in width between said narrow width paper and said intermediate width paper;
  • magnet means movable in response to movement of said paper-positioning means along a path adjacent said switches to operate said switches in response to the position of said paper-positioning means.
  • a paper-feeding apparatus as claimed in claim 6, wherein said magnet means includes:
  • first and second magnets spaced apart a distance substantially equal to the spacing of said first and second switches.
  • a paper-feeding apparatus for feeding copy sheets seriatim from one of a plurality of stacks of paper including at least stacks of paper of narrow width, intermediate width and wide width positionable on said apparatus, said apparatus comprising:
  • a paper support having a top side and a bottom side, said paper being supportable on said top side;
  • said first set of fingers being engageable with paper of each of said widths
  • said second set of vacuum fingers being engageable with said intermediate width paper and said wide width paper only
  • said third set of vacuum fingers being engageable with said wide width paper only
  • said sets of vacuum fingers being movable toward and away from said support for feeding paper from a stack of paper on said support;
  • a first energizable solenoid valve interconnecting said second set of vacuum fingers with said vacuum supply means and being movable between an open and closed position
  • a second energizable solenoid valve interconnecting said vacuum supply means and said third set of vacuum fingers and being movable between an open and closed position
  • first and second paper guides movable on opposite sides of a stack of paper to center said paper on said support;
  • first and second spaced magnets on one of said paper guides for activating said switches spaced apart a distance equal to the spacing of said first and second switch means and movable with said side guides so that when said guides are in position to center said narrow width paper both of said first and second switches are activated so that both said first and second solenoid valves are energized to shut off vacuum to said second and third set of fingers and when said paper guide is in position to center said intennediate width paper, said second switch is activated to close said second solenoid valve ener ized to shut off vacuum to said third set of vacuum mgers and when sand paper guide is in position to center said wide width paper neither of said switches is activated so that vacuum is supplied to all three sets of vacuum fingers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US29403A 1970-04-17 1970-04-17 Vacuum paper feeder Expired - Lifetime US3617048A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2940370A 1970-04-17 1970-04-17

Publications (1)

Publication Number Publication Date
US3617048A true US3617048A (en) 1971-11-02

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Application Number Title Priority Date Filing Date
US29403A Expired - Lifetime US3617048A (en) 1970-04-17 1970-04-17 Vacuum paper feeder

Country Status (5)

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US (1) US3617048A (de)
CA (1) CA936887A (de)
DE (1) DE2118909C3 (de)
FR (1) FR2089744A5 (de)
GB (1) GB1273949A (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3767186A (en) * 1971-07-23 1973-10-23 S & S Corrugated Paper Mach Sheet feeder having suction assist
US4029009A (en) * 1975-07-17 1977-06-14 Veb Polygraph Leipzig Kombinat Fur Polygraphische Maschinen Und Ausrustungen Printing machine construction
US4096941A (en) * 1976-05-28 1978-06-27 Rengo Kabushiki Kaisha Conveyor system for a cutter for a web of corrugated fiberboard
US4168829A (en) * 1977-06-20 1979-09-25 Eastman Kodak Company Control valve for vacuum sheet feeding apparatus
US4236710A (en) * 1977-05-24 1980-12-02 Fuji Photo Film Co., Ltd. Sheet supplying apparatus
US4245831A (en) * 1979-01-26 1981-01-20 Eastman Kodak Company Adjustable tray
US4513957A (en) * 1983-05-03 1985-04-30 Ncr Corporation Item dispensing system
US4564186A (en) * 1984-06-04 1986-01-14 R. R. Donnelley & Sons Company Apparatus for gathering printed signatures for saddle stitching
US4615520A (en) * 1983-03-26 1986-10-07 Heidelberger Druckmaschinen Ag Apparatus and method for aligning sheets
US4648588A (en) * 1985-06-12 1987-03-10 Rca Corporation Articulated manipulation device
US4701094A (en) * 1985-01-30 1987-10-20 Compagnie Generale D'automatisme Cga-Hbs Separator for heterogenous flat objects
US4712784A (en) * 1985-05-31 1987-12-15 Rca Corporation Adjustable vacuum pad
US4728092A (en) * 1986-03-21 1988-03-01 Astro Machine Corporation Suction control system for suction cup sheet feeding apparatus
US4874160A (en) * 1986-11-20 1989-10-17 Sharp Kabushiki Kaisha Paper cartridge with paper aligning means
US5088716A (en) * 1989-03-04 1992-02-18 Heidelberger Druckmaschinen Ag Device for scanning the length of a sheet in a sheet processing machine, such as a sheet-fed rotary printing press particularly
US5429348A (en) * 1994-03-07 1995-07-04 Xerox Corporation Adjustable top vacuum corrugation feeder
US5615875A (en) * 1994-04-13 1997-04-01 Heidelberger Druckmaschinen Ag Device for receiving sheet piles thereon in a sheet-fed printing press
US6571709B1 (en) * 2002-01-10 2003-06-03 Agfa Corporation Apparatus and method for picking printing plates of various sizes
US20100213666A1 (en) * 2009-02-24 2010-08-26 Xerox Corporation Media transport device with vacuum-controlled positioning
US10093507B2 (en) * 2012-10-30 2018-10-09 Bobst Mex Sa Device for holding a flat sheet-shaped element circulating in a processing machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58220030A (ja) * 1982-06-15 1983-12-21 Dainippon Screen Mfg Co Ltd シ−ト材の自動給排装置
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1820469A (en) * 1929-09-10 1931-08-25 Lisenby Mfg Company Automatic paper feeding mechanism for printing presses
US2262109A (en) * 1940-07-29 1941-11-11 Robert F Foard Automatic feeder for printing presses
US3339916A (en) * 1965-03-19 1967-09-05 Addressograph Multigraph Sheet feeding assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1820469A (en) * 1929-09-10 1931-08-25 Lisenby Mfg Company Automatic paper feeding mechanism for printing presses
US2262109A (en) * 1940-07-29 1941-11-11 Robert F Foard Automatic feeder for printing presses
US3339916A (en) * 1965-03-19 1967-09-05 Addressograph Multigraph Sheet feeding assembly

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3767186A (en) * 1971-07-23 1973-10-23 S & S Corrugated Paper Mach Sheet feeder having suction assist
US4029009A (en) * 1975-07-17 1977-06-14 Veb Polygraph Leipzig Kombinat Fur Polygraphische Maschinen Und Ausrustungen Printing machine construction
US4096941A (en) * 1976-05-28 1978-06-27 Rengo Kabushiki Kaisha Conveyor system for a cutter for a web of corrugated fiberboard
US4236710A (en) * 1977-05-24 1980-12-02 Fuji Photo Film Co., Ltd. Sheet supplying apparatus
US4168829A (en) * 1977-06-20 1979-09-25 Eastman Kodak Company Control valve for vacuum sheet feeding apparatus
US4245831A (en) * 1979-01-26 1981-01-20 Eastman Kodak Company Adjustable tray
US4615520A (en) * 1983-03-26 1986-10-07 Heidelberger Druckmaschinen Ag Apparatus and method for aligning sheets
US4702469A (en) * 1983-03-26 1987-10-27 Heidelberger Druckmaschinen Ag Apparatus and method for aligning sheets
US4513957A (en) * 1983-05-03 1985-04-30 Ncr Corporation Item dispensing system
US4564186A (en) * 1984-06-04 1986-01-14 R. R. Donnelley & Sons Company Apparatus for gathering printed signatures for saddle stitching
US4701094A (en) * 1985-01-30 1987-10-20 Compagnie Generale D'automatisme Cga-Hbs Separator for heterogenous flat objects
US4712784A (en) * 1985-05-31 1987-12-15 Rca Corporation Adjustable vacuum pad
US4648588A (en) * 1985-06-12 1987-03-10 Rca Corporation Articulated manipulation device
US4728092A (en) * 1986-03-21 1988-03-01 Astro Machine Corporation Suction control system for suction cup sheet feeding apparatus
US4874160A (en) * 1986-11-20 1989-10-17 Sharp Kabushiki Kaisha Paper cartridge with paper aligning means
US5088716A (en) * 1989-03-04 1992-02-18 Heidelberger Druckmaschinen Ag Device for scanning the length of a sheet in a sheet processing machine, such as a sheet-fed rotary printing press particularly
US5429348A (en) * 1994-03-07 1995-07-04 Xerox Corporation Adjustable top vacuum corrugation feeder
US5615875A (en) * 1994-04-13 1997-04-01 Heidelberger Druckmaschinen Ag Device for receiving sheet piles thereon in a sheet-fed printing press
US6571709B1 (en) * 2002-01-10 2003-06-03 Agfa Corporation Apparatus and method for picking printing plates of various sizes
EP1327593A1 (de) * 2002-01-10 2003-07-16 Agfa Corporation Vorrichtung und Verfahren zum Abnehmen von Druckplatten unterschiedlicher Grössen
US20100213666A1 (en) * 2009-02-24 2010-08-26 Xerox Corporation Media transport device with vacuum-controlled positioning
US10093507B2 (en) * 2012-10-30 2018-10-09 Bobst Mex Sa Device for holding a flat sheet-shaped element circulating in a processing machine

Also Published As

Publication number Publication date
CA936887A (en) 1973-11-13
FR2089744A5 (de) 1972-01-07
DE2118909B2 (de) 1973-04-26
DE2118909C3 (de) 1973-11-08
DE2118909A1 (de) 1971-11-04
GB1273949A (en) 1972-05-10

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