EP0207513A1 - Vorrichtung zum Beseitigen von elektrostatischen Ladungen - Google Patents
Vorrichtung zum Beseitigen von elektrostatischen Ladungen Download PDFInfo
- Publication number
- EP0207513A1 EP0207513A1 EP86109043A EP86109043A EP0207513A1 EP 0207513 A1 EP0207513 A1 EP 0207513A1 EP 86109043 A EP86109043 A EP 86109043A EP 86109043 A EP86109043 A EP 86109043A EP 0207513 A1 EP0207513 A1 EP 0207513A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rollers
- strip
- electrostatic charges
- dielectric
- passing
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims 1
- 239000003989 dielectric material Substances 0.000 description 15
- 230000008030 elimination Effects 0.000 description 5
- 238000003379 elimination reaction Methods 0.000 description 5
- 239000003570 air Substances 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices
Definitions
- the present invention relates to an erasing device responsible for ensuring the elimination of the electrostatic charges which are likely to be borne by dielectrics in thin strip, in particular those of the film roll type which are used as transfer ribbons. image in electrostatic printers.
- Thin dielectric bands have the property of being easily electrified when they are in contact with other materials or with themselves during their shaping.
- the parasitic electric fields thus created have their origin in the electrostatic charges carried on the surface by the dielectric, in the active dipoles created by the molecular chains of the material constituting this dielectric and incidentally by surface doublets.
- Another known means consists of a metallic wire of small diameter stretched parallel to the surface of the dielectric and subjected to a high alternating voltage which creates by ionization of the ambient air a flow of ions, alternately positive then negative, intended to compensate for the surface charge of one of the two faces of the dielectric by electrostatic attraction.
- the present invention therefore provides an erasing device for eliminating electrostatic charges for thin strip dielectric.
- the erasing device comprises at least two electrostatic conducting rollers, forming electrodes, which are subjected to a potential difference by a high alternating voltage and which are parallel so as to make contact transversely and at the same level, each on one side of the thin strip of dielectric flowing between them.
- the electrostatic charge erasing device presented in FIG. 1 is intended to eliminate any trace of electrostatic charge from a strip of conventional dielectric material 1, coming from a coil, with a view to being used as a temporary recording medium by an electrostatic printer indirect.
- This indirect electrostatic printer is for example of the model mentioned in French patent n ° 2 524 390 and the strip of dielectric material is intended to serve as an intermediate support for a latent electrostatic image which must be developed and then transferred to a final support, generally paper, on which it is then fixed.
- the erasing device is then placed between the reel of strip of dielectric material 1 and a latent image printing station associating a print head 2 and a roll counter-electrode 3.
- the print head 2 is conventionally provided with a plurality of individual electrodes, arranged in one or more lines or in matrix form, which are arranged opposite the counter-electrode on a roll 3.
- the strip of dielectric material 1 circulates between print head 2 and counter-electrode 3 to receive a latent electrostatic image on that of its faces which comes into contact with the print head, when the latter receives print command signals from a non-circuit shown here.
- the erasing device according to the invention is therefore placed, in the example proposed, just upstream of the print head 2 so as to remove from the strip of dielectric material 1, before printing, all the parasitic electrostatic charges liable to s 'find there.
- the erasing device is composed of at least two conductive rollers 4 and 5, forming electrodes, which are parallel and between which the strip of dielectric material 1, here from the coil to the printing head 2, circulates.
- the roller 4 is constituted by a cylinder of hard conductive material, for example metallic, this cylinder is electrically connected to the ground by means of at least one electrical connector arrangement 6, placed at one end of a carrier shaft 4A of the roller 4, such as a conventional assembly, not shown, of the type with a rotating ring carried by the end of the shaft and a fixed brush placed near a bearing.
- the roller 5 consists of an electrically conductive cylinder, for example of flexible material of the elastomer or silicone type charged with conductive particles; this cylinder is carried by a metal shaft 5A here mounted idly and connected to an alternating potential V via a second electrical connector arrangement 7.
- the two rollers 4 and 5 are pressed against each other according to a generator of the cylinder that each one forms.
- An elastic spring or compressed material assembly provides the necessary pressure according to a conventional arrangement conventional in the material which will not be described further since it is not directly related to the invention.
- the alternating potential V is supplied by a conventional high-voltage source, not shown, which supplies for example an at least approximately sinusoidal signal, chosen for example from the range 1 kHz-150 kHz, the potential difference applied being of the order of 1500 volts. peak to peak.
- the strip of dielectric material 1 which circulates between the rollers 4 and 5 is normally interposed between their respective conductive parts so as to avoid direct contact between these parts, the active width of these rollers is therefore generally limited so as to always be less to the width of the strip.
- one of the rollers is possibly narrower than the other; alternatively insulating rings can be mounted at the ends of the rollers 4, 5, so that the strip is supported by its edges on its rings preventing the conductive parts from coming into contact in the event of slight lateral movement of the strip, during of its movement.
- the strip of dielectric material 1 which is pressed by one roller against the other under the pressure of a conventional mechanism not shown, penetrates and / or springs between the rollers 4, 5 with a more or less pronounced inclination relative to the plane Q, the trace of which is shown in FIG. 2, which passes between the rollers 4, 5, and which is perpendicular to the plane passing the axes of the shafts 4A, 5A of these rollers.
- the strip 1 is in contact with more or less of each of these rollers according to this inclination.
- the introduction and exit of the strip takes place below the plane P passing between the rollers 4 and 5 which is perpendicular to the plane Q passing through the axes of the shafts 4A, 5A so that the tape is applied to a surface of the roller 4 which is greater than that where it is applied to the roller 5.
- this surface is distributed over the roller 4 on either side of the plane passing through the axes of the shafts 4A, 5A, which makes it possible to obtain two zones of ionic discharge in the air respectively located on either side of this plane, between the roller 5 and the strip of dielectric material 1.
- FIG. 4 recalls the necessary ionization voltage V, in air at ambient pressure and temperature, as a function of the distance between the electrode brought to the ionization potential and the face of the film facing this electrode and the film thickness e and its dielectric constant. It is shown there that there is ionic discharge over a defined interval of distances L, and consequently elimination of the electrostatic charges carried by the strip at least on the face oriented towards the roller 5.
- the roller 5 brought to the ionization potential V can be associated with two parallel, conductive rollers, identical, such as 4, arranged for example on either side of the roller 5, so as to allow the successive passage into the same movement of each of the two faces of the strip of dielectric material 1 against the roll 5, between this roll 5 and a different roll linked to the ground for each strip face, the latter then forming a loop, not shown.
- rollers provided both in this variant and in the example presented in FIG. 1 are conventionally positioned by bearings in a chassis, according to arrangements which are well known in the matter and which are therefore neither shown nor recalled here.
Landscapes
- Elimination Of Static Electricity (AREA)
- Advancing Webs (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Photoreceptors In Electrophotography (AREA)
- Developing Agents For Electrophotography (AREA)
- Solid State Image Pick-Up Elements (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86109043T ATE57453T1 (de) | 1985-07-03 | 1986-07-03 | Vorrichtung zum beseitigen von elektrostatischen ladungen. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8510168A FR2584560B1 (fr) | 1985-07-03 | 1985-07-03 | Dispositif effaceur de charges electrostatiques |
FR8510168 | 1985-07-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0207513A1 true EP0207513A1 (de) | 1987-01-07 |
EP0207513B1 EP0207513B1 (de) | 1990-10-10 |
Family
ID=9320932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86109043A Expired - Lifetime EP0207513B1 (de) | 1985-07-03 | 1986-07-03 | Vorrichtung zum Beseitigen von elektrostatischen Ladungen |
Country Status (7)
Country | Link |
---|---|
US (1) | US4831488A (de) |
EP (1) | EP0207513B1 (de) |
JP (1) | JPS62503200A (de) |
AT (1) | ATE57453T1 (de) |
DE (1) | DE3674842D1 (de) |
FR (1) | FR2584560B1 (de) |
WO (1) | WO1987000389A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2119657A2 (de) * | 2008-05-15 | 2009-11-18 | Macpi Pressing Division S.P.A. | Haftmittelaufbringvorrichtung zum Aufbringen einer Haftverbindung auf Stoffmaterialstücken |
WO2012052254A1 (en) * | 2010-10-22 | 2012-04-26 | Sca Hygiene Products Ab | Apparatus with arc generator for dispensing absorbent sheet products |
RU2575695C2 (ru) * | 2010-10-22 | 2016-02-20 | Ска Хайджин Продактс Аб | Устройство с дуговым генератором для раздачи впитывающих листовых изделий |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS643113U (de) * | 1987-06-25 | 1989-01-10 | ||
US4992907A (en) * | 1989-05-12 | 1991-02-12 | Hewlett-Packard Company | Electrostatic discharge protection system |
ES2162531B1 (es) * | 1998-05-27 | 2002-08-01 | Serveis De Produccio Empresari | Perfeccionamientos en la eliminacion de electricidad estatica en lineas de extrusion. |
US6592067B2 (en) | 2001-02-09 | 2003-07-15 | Georgia-Pacific Corporation | Minimizing paper waste carousel-style dispenser apparatus, sensor, method and system with proximity sensor |
US7017856B2 (en) * | 2001-02-09 | 2006-03-28 | Georgia-Pacific Corporation | Static build-up control in dispensing system |
DE60213491T3 (de) * | 2001-02-09 | 2011-01-20 | Georgia-Pacific Corp. | Spender mit Erdungsvorrichtung und Verfahren dafür |
US7102366B2 (en) * | 2001-02-09 | 2006-09-05 | Georgia-Pacific Corporation | Proximity detection circuit and method of detecting capacitance changes |
US7341170B2 (en) * | 2002-03-07 | 2008-03-11 | Georgia-Pacific Consumer Operations Llc | Apparatus and methods usable in connection with dispensing flexible sheet material from a roll |
US7553440B2 (en) * | 2005-05-12 | 2009-06-30 | Leonard William K | Method and apparatus for electric treatment of substrates |
RU2441566C2 (ru) * | 2006-02-18 | 2012-02-10 | Джорджия-Пэсифик Консьюмер Продактс Лп | Электронное раздаточное устройство для выдачи листовых изделий |
US7878446B2 (en) * | 2006-10-20 | 2011-02-01 | Georgia-Pacific Consumer Products Lp | Dispenser housing with motorized roller transport |
CA2804365A1 (en) * | 2010-07-07 | 2012-01-12 | Sca Hygiene Products Ab | Apparatus for dispensing absorbent sheet products and method for modifying such apparatus |
NL2007783C2 (en) * | 2011-11-14 | 2013-05-16 | Fuji Seal Europe Bv | Sleeving device and method for arranging tubular sleeves around containers. |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1154211A (fr) * | 1956-01-30 | 1958-04-03 | Modern Plastic Machinery Corp | Procédé et dispositif pour le traitement superficiel des matières plastiques et analogues |
FR2002962A1 (de) * | 1968-03-19 | 1969-11-07 | Iwasaki Tsushinki | |
FR2077603A1 (de) * | 1970-01-16 | 1971-10-29 | Eastman Kodak Co |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3671806A (en) * | 1970-11-20 | 1972-06-20 | Eastman Kodak Co | Method of and apparatus for applying an electrical charge to a moving sheet of flexible material |
US4363070A (en) * | 1980-09-02 | 1982-12-07 | Polaroid Corporation | Neutralization of electrostatic charges |
FR2524390B1 (fr) * | 1982-04-02 | 1986-10-17 | Cit Alcatel | Imprimante electrostatique indirecte |
US4494166A (en) * | 1982-09-21 | 1985-01-15 | Xerox Corporation | Printing machine with static elimination system |
-
1985
- 1985-07-03 FR FR8510168A patent/FR2584560B1/fr not_active Expired - Lifetime
-
1986
- 1986-07-01 JP JP61503668A patent/JPS62503200A/ja active Pending
- 1986-07-01 WO PCT/FR1986/000233 patent/WO1987000389A1/fr unknown
- 1986-07-03 AT AT86109043T patent/ATE57453T1/de not_active IP Right Cessation
- 1986-07-03 EP EP86109043A patent/EP0207513B1/de not_active Expired - Lifetime
- 1986-07-03 DE DE8686109043T patent/DE3674842D1/de not_active Expired - Lifetime
-
1987
- 1987-03-03 US US07/021,371 patent/US4831488A/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1154211A (fr) * | 1956-01-30 | 1958-04-03 | Modern Plastic Machinery Corp | Procédé et dispositif pour le traitement superficiel des matières plastiques et analogues |
FR2002962A1 (de) * | 1968-03-19 | 1969-11-07 | Iwasaki Tsushinki | |
FR2077603A1 (de) * | 1970-01-16 | 1971-10-29 | Eastman Kodak Co |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2119657A2 (de) * | 2008-05-15 | 2009-11-18 | Macpi Pressing Division S.P.A. | Haftmittelaufbringvorrichtung zum Aufbringen einer Haftverbindung auf Stoffmaterialstücken |
EP2119657A3 (de) * | 2008-05-15 | 2011-02-02 | Macpi Pressing Division S.P.A. | Haftmittelaufbringvorrichtung zum Aufbringen einer Haftverbindung auf Stoffmaterialstücken |
WO2012052254A1 (en) * | 2010-10-22 | 2012-04-26 | Sca Hygiene Products Ab | Apparatus with arc generator for dispensing absorbent sheet products |
US8730643B2 (en) | 2010-10-22 | 2014-05-20 | Sca Hygiene Products Ab | Apparatus with arc generator for dispensing absorbent sheet products |
RU2575695C2 (ru) * | 2010-10-22 | 2016-02-20 | Ска Хайджин Продактс Аб | Устройство с дуговым генератором для раздачи впитывающих листовых изделий |
AU2011317767B2 (en) * | 2010-10-22 | 2016-07-07 | Essity Hygiene And Health Aktiebolag | Apparatus with arc generator for dispensing absorbent sheet products |
Also Published As
Publication number | Publication date |
---|---|
FR2584560B1 (fr) | 1990-05-11 |
FR2584560A1 (fr) | 1987-01-09 |
US4831488A (en) | 1989-05-16 |
JPS62503200A (ja) | 1987-12-17 |
DE3674842D1 (de) | 1990-11-15 |
ATE57453T1 (de) | 1990-10-15 |
EP0207513B1 (de) | 1990-10-10 |
WO1987000389A1 (fr) | 1987-01-15 |
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