US3799419A - Apparatus for slowing down and stopping moving webs or foil - Google Patents

Apparatus for slowing down and stopping moving webs or foil Download PDF

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Publication number
US3799419A
US3799419A US00321977A US32197773A US3799419A US 3799419 A US3799419 A US 3799419A US 00321977 A US00321977 A US 00321977A US 32197773 A US32197773 A US 32197773A US 3799419 A US3799419 A US 3799419A
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US
United States
Prior art keywords
web
suction table
vacuum
chamber
linkage means
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
US00321977A
Other languages
English (en)
Inventor
H Bussmann
O Peckhaus
H Frenken
W Schweicher
K Voss
P Herzhoff
H Gref
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
Application granted granted Critical
Publication of US3799419A publication Critical patent/US3799419A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B65H23/245—Suction retarders
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B35/00—Stereoscopic photography
    • G03B35/18—Stereoscopic photography by simultaneous viewing
    • G03B35/24—Stereoscopic photography by simultaneous viewing using apertured or refractive resolving means on screens or between screen and eye

Definitions

  • ABSTRACT Apparatus for controlling the movement of a web 22 Filed:
  • This invention relates to an apparatus for slowing down and stopping webs of foil moving over rollers.
  • the invention is particularly suitable for webs which have been wet coated on one side.
  • a stopping method has recently been disclosed by which a braking action is also applied to the drives. Although the stopping distance is thereby reduced, it is still not possible to bring the casting and drying plant to a stop so quickly that the fault can be corrected without substantial loss in time and material.
  • Faults which are particularly important in the production process are tears or. complete rupture of the web. Such faults are particularly likely to occur at the point where the coating is applied, e.g. due to lumps of baryta getting caught in the casting gap.
  • the invention therefore provides an apparatus for controlling the movement of a web comprising a suction table, linkage means connected to said suction table and detector means which actuates said linkage means, said suction table being provided with a normally sealed vacuum reservoir which is opened by operation of said linkage means on actuation of said detector on detection of a fault in said web whereby said vacuum is applied to said web to apply a braking force thereto.
  • the suction table is brought up to the back surface of the web.
  • the movement of the suction table to the web is advantageously released by a fault signal.
  • the transmission mechanism for shifting the table into the plane of the web is coupled to a fault detection instrument.
  • the suction table should move as quickly as possible into the plane of the web in response to a fault signal.
  • the transmission mechanism must have a power transmission ratio of at least 2:].
  • the suction table while the suction table is being moved into position, its apertures are open to a vacuum chamber which is connected to a vacuum reservoir.
  • the pressure in this vacuum reservoir is maintained at a substantially constant vacuum.
  • the volume of the reservoir is large compared with that of the vacuum chamber so that no changes in pressure occur.
  • the friction between the web and the suction table is proportional to the vacuum in the suction table.
  • Another feature of the invention accordingly consists of a measuring device for measuring the vacuum and hence also the friction. In this way, the braking .process becomes measureable.
  • the braking device desribed above can be used successfully in photographic casting and drying plants. Since tears and separations in the web occur mainly in the casting part of the plant, it is advisable to arrange the braking device adjacent to the casting apparatus.
  • the major advantage achieved with the invention is that the web can now be stopped much more quickly. Moreover, the friction and hence the braking force can be varied within limits by suitable adjustment of the pressure.
  • FIG. 1 shows the arrangement of the suction table in the inoperative position (side view)
  • FIG. 2 shows the arrangement of the suction table in the operative position (side view) and FIGS. 3 and 4 show the transmission mechanism.
  • the web 1 is passed vertically over rollers 2.
  • the rollers 2 come into contact only with the uncoated back of the web 1.
  • the suction table 3 contains a vacuum chamber 8 sealed by seals 6 and 7.
  • This chamber 8 is connected to a vacuum reservoir (not shown by the pipe 9.)
  • the volume of this reservoir is large compared with the volume of the vacuum chamber 8.
  • the vacuum is produced with a suction pump or ventilator and can be adjusted to any desired value.
  • a fault detecting device (not shown) issues the instruction for switching off the web drive mechanism.
  • the suction table 3 is moved forward into the plane of the web.
  • the back of the web 1 is sucked to the front surface'4 of the suction table 3 and thereby very quickly stopped.
  • the forward position of the suction table 3 is shown in FIG. 2.
  • FIGS. 3 and 4 show the transmission mechanism for shifting the suction table 3 forward into the operative position.
  • the table is supported by the two rocking arms 10 and two lifting arms 1 l.
  • the force for the movement is transmitted by the way of the pneumatic piston 12 and rocking link 13.
  • the forward movement of the suction table 3 stops when the pins 14 of the table 3 bear against the base 15.
  • the vacuum chamber 8 is connected to the atmosphere through the now open seal 6 and apertures 5 so that air is sucked through the apertures until the web'l is pressed by suction against the front surface 4, thereby covering the apertures 5.
  • the volume of the vacuum reservoir is sufficiently large to ensure that no significant increase in pressure occurs during this time.
  • the time taken for the braking device to respond is an important parameter. It depends on the nature of the transmission mechanism and the time required for the forward movement of the table. To obtain short response times, the transmission mechanism is so designed that the force transmission ration is greater than 2:1. It has also table found that the time taken for the suction talbe to move forward is considerably reduced by the suction produced. This suction accelerates the suction table 3 in the direction of the web 1. The force of this suction is K F A p, in which P is the total surface area of all the apertures and Ap the differences between atmospheric pressure and the pressure on the suction table. When the suction table 3 has reached the web 1, this force becomes a suction force of equal magnitude by which the web 1 is held to the front surface 4 of the suction table 3. The response time is in practice found to be less than 0.1 second.
  • the braking force acting on the web 1 is proportional to the negative pressure Ap, the surface area F of the apertures and the friction ,u between the web 1 and front surface 4 of the suction table 3.
  • the braking force can therefore always be adjusted to the optimum value by suitable choice of the negative pressure Ap even if the friction p. varies.
  • Apparatus for controlling the movement of a web comprising a suction table, linkage means connected to said suction table, actuator means connected to said linkage means for actuating said linkage means, said suction table being provided with a normally sealed vacuum reservoir which is opened by operation of said linkage means on actuation of said actuator means whereby said vacuum is applied to said web to apply a braking force thereto and said linkage means being adapted to move said vacuum table into contact with said web on actuation by said actuator means.
  • suction table is provided with a plurality of apertures and with a chamber which is open in both the inoperative and operative positions of the linkage means.
  • Apparatus as claimed in claim 1 which is provided with means for measuring the vacuum in said suction table.
  • said suction table comprises an apertured surface, intermediate lugs, a base, seal means between and lugs and said base, slide means connecting said vacuum table to said base whereby said suction table is pennitted to move towards and away from said web, and said seals bing constructed and arranged to seal said apertured surface from said vacuum reservoir when said suction table is disposed remote from said web on said base.
  • said base comprises a pedestal element having a plate element upon a leg, and said seals being provided on said plate element.
  • said suction table comprises a hollow chamber having said apertured surface, an opening in said chamber in a wall remote from apertured surface through which said leg is inserted, said lugs extending within said chamber adjacent said apertured surface and in line with the outside of said plate, a flexible vacuum tight seal between said leg and said opening in said chamber and said seal means being disposed in said periphery of said plate for contacting said lugs when said chamber is disposed remote from said web.
  • stop projections are provided in said chamber adjacent said opening for reacting against the surface of said plate remote from said apertured surface for limiting the travel of said suction table against said web.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Advancing Webs (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Coating Apparatus (AREA)
  • Replacement Of Web Rolls (AREA)
US00321977A 1972-01-13 1973-01-08 Apparatus for slowing down and stopping moving webs or foil Expired - Lifetime US3799419A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722201446 DE2201446A1 (de) 1972-01-13 1972-01-13 Vorrichtung zum bremsen und anhalten von laufenden folienbahnen

Publications (1)

Publication Number Publication Date
US3799419A true US3799419A (en) 1974-03-26

Family

ID=5832882

Family Applications (1)

Application Number Title Priority Date Filing Date
US00321977A Expired - Lifetime US3799419A (en) 1972-01-13 1973-01-08 Apparatus for slowing down and stopping moving webs or foil

Country Status (8)

Country Link
US (1) US3799419A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4880884A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE793806A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH544713A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2201446A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2168086A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1400902A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT976819B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034905A (en) * 1974-02-19 1977-07-12 Jagenberg Werke Ag Flat advancement of running web between guide rollers
US4350310A (en) * 1979-12-12 1982-09-21 Froehling Peter Apparatus for braking travelling strip material
WO2004074754A1 (en) * 2003-02-14 2004-09-02 3M Innovative Properties Company Web positioning device
US20120222528A1 (en) * 2009-10-06 2012-09-06 Kroehnert Rene Device for cutting paper webs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230406A (en) * 1979-03-26 1980-10-28 Xerox Corporation Cleaning system for an electrostatic copier

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032245A (en) * 1960-04-25 1962-05-01 Gravure Res Inc Apparatus for controlling web tension
US3061159A (en) * 1958-09-15 1962-10-30 A C T Inc Air actuated self-energizing tensioning system
US3489325A (en) * 1967-10-25 1970-01-13 Borg Warner Control system with multichamber vacuum unit for regulating lateral web alignment
US3523631A (en) * 1969-05-16 1970-08-11 Skinner Precision Ind Inc Foil feeding system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061159A (en) * 1958-09-15 1962-10-30 A C T Inc Air actuated self-energizing tensioning system
US3032245A (en) * 1960-04-25 1962-05-01 Gravure Res Inc Apparatus for controlling web tension
US3489325A (en) * 1967-10-25 1970-01-13 Borg Warner Control system with multichamber vacuum unit for regulating lateral web alignment
US3523631A (en) * 1969-05-16 1970-08-11 Skinner Precision Ind Inc Foil feeding system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034905A (en) * 1974-02-19 1977-07-12 Jagenberg Werke Ag Flat advancement of running web between guide rollers
US4350310A (en) * 1979-12-12 1982-09-21 Froehling Peter Apparatus for braking travelling strip material
WO2004074754A1 (en) * 2003-02-14 2004-09-02 3M Innovative Properties Company Web positioning device
US6996921B2 (en) 2003-02-14 2006-02-14 3M Innovative Properties Company Web positioning device
US7159334B2 (en) 2003-02-14 2007-01-09 3M Innovative Properties Company Web coating machine
US20120222528A1 (en) * 2009-10-06 2012-09-06 Kroehnert Rene Device for cutting paper webs
US10106356B2 (en) * 2009-10-06 2018-10-23 Kern Ag Device for cutting paper webs

Also Published As

Publication number Publication date
IT976819B (it) 1974-09-10
GB1400902A (en) 1975-07-16
DE2201446A1 (de) 1973-07-19
CH544713A (de) 1973-11-30
BE793806A (fr) 1973-07-10
JPS4880884A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-10-29
FR2168086A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-08-24

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