US3899792A - Copy sheet drying and delivering device for reprographic machine - Google Patents

Copy sheet drying and delivering device for reprographic machine Download PDF

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Publication number
US3899792A
US3899792A US473115A US47311574A US3899792A US 3899792 A US3899792 A US 3899792A US 473115 A US473115 A US 473115A US 47311574 A US47311574 A US 47311574A US 3899792 A US3899792 A US 3899792A
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US
United States
Prior art keywords
drying
copy sheet
machine
rollers
copy
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
US473115A
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English (en)
Inventor
Giovanni Ravera
Giorgio Siletto
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.)
Olivetti SpA
TIM SpA
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Olivetti SpA
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 Olivetti SpA filed Critical Olivetti SpA
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Publication of US3899792A publication Critical patent/US3899792A/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/11—Removing excess liquid developer, e.g. by heat

Definitions

  • the drying station following the liquid developing station comprises a pair of squeezing rollers and at least a pair of drying rollers constituted by a roller covered with natural or synthetic leather known on the market as chamois leather" or buck skin” and a pressing counter rollers; and in which the longitudinal axes of said pairs of squeezing and drying rollers are disposed in the machine along an ascendent curved path the nip of the last pair of drying roller being disposed adjacent to the sheet output slit of the machine, this slit is disposed at such a height with respect to the copy accumulating plane of the machine as to cause the outcoming sheet to take up a curved direction the concavity of which is turned toward the machine and such as to upset it so that the image becomes turned downward toward the accumulating surface.
  • the present invention concerns a copy sheet drying and delivery device for a reprographic machine, in particular for an electrostatic copy machine of the liquid developing type, wherein the copy sheet is moved through a liquid developer bath and finally it is dried and delivered onto the outlet of said machine.
  • the invention concerns a device which dries by means of rollers and the allocation thereof on the output path of the finished copies.
  • the delivery of the copy sheet occurs by laying the copy sheet on the output stacker with the image surface turned upward. Therefore, when a plurality of consecutive copies are obtained, the stacking order of the copy sheets in said stacker is such that the last copy delivered is located in the first stack position from the top toward the bottom, and its face bearing the image is turned upward. This requires a rearrangement of said copy sheets by the operator when the copying operation has come to an end, or the use of devices adapted to turn each sheet upside down when it is delivered.
  • an object of the invention is to provide an improved copy sheet drying and delivering device which obviates the above mentioned disadvantages.
  • a copy sheet drying and delivering device in which the drying station comprises a pair of squeezing rollers and at least one pair of drying rollers comprising a roller covered with natural or synthetic leather and a pressing counterroller; and in which the longitudinal axes of said pairs of squeezing and drying rollers are disposed along an ascending curved path, the last pair of the drying rollers being located adjacent to the sheet output slit of the machine; this slit being disposed at a height, with respect to the copy accumulating surface; which is greater than the half length of the maximum format of said copy sheet. and less than the minimum format length of said copy sheet, so as to cause the outcoming sheet to take up a curved direction, the concavity of which is turned toward the machine and is such as to upset it so that the image becomes turned downwards toward the accumulating surface.
  • FIG. I is a lateral section of the device according to the invention.
  • the copy sheet transfer system through said stations consists of pairs of rollers: 4, 5; 6, 7', 8, 9; 10, II; fulcrummed on suitable machine pivots.
  • the rollers 4, 6, 8, IO drive the corresponding counterrollers 5, 7, 9, 11, the former being set into motion by a motor through known systems not depicted in the FIGURE.
  • the rollers 6, 7, 8, 10 are of hard rubber and the rollers 9, II have their outer surface covered by layers 12 of natural or synthetic liquid absorbent material, generally known on the market as "chamois leather or buck-skin", assembled on a hard rubber substrate.
  • the disposition of the axes of the pairs of rollers 6, 7; 8, 9', I0, I]; is such as to define for the copy sheets, which are moved between the rollers of each pair, a curved path which is concave downward and is ascending from the developing station I to a slit I3, provided in the machine frame, which represents the outlet of the copy sheet and is placed over a receptacle I4 adapted to receive and to accumulate the copy sheets coming out from the machine.
  • the slit height, with respect to the plane of the receptacle I4 is greater than the half of the maximum format length of the copy sheet and less than the minimum format length of said sheet.
  • the copy sheet 18, driven by the pair of roller 4, 5 with the image side facing up, is moved through the toner developing bath I5, contained in the reservoir 16, and then it is seized and advanced by the squeezing rollers 6, 7 which remove the super abondant developing liquid.
  • the sheet 18 is successively seized and advanced by the pairs of rollers 8, 9; and 10, 11 where the drying operation is carried out by the rollers 8 and I0 which are pressed against the corresponding rollers 9 and 11 provided with the chamois leather covering 12 which causes the absorption of the residual liquid by the porosity of the layer I2.
  • the toner developer particles transferred by the liquid vehicle are absorbed by the porosity of the chamois leather layer 12 and are entraped therein.
  • the leather has a sufficient impregnating power so as to guarantee good sheet drying and cleanness for the most part of the machine operative life.
  • the leading edge I9 of the sheet 18 is then applied onto the output slit l3.
  • the copy sheet 18 emerging from the slit shows a curvature, the concavity whereof is turned toward the machine (see the FIGURE). which aids its leading edge 19 to be laid onto the stacker I4, with the developed image side facing down.
  • This functionality is aided by the copy sheet weight and flexibility and, specially, by the slit height with respect to the plane of the stacker 14 compared to the length of the copy sheet. It is in fact required that the copy is not released by the outlet pair of rollers 10, ll before its leading edge is contacting the lying plane of the stacker.
  • a copy sheet drying and delivering device comprising:
  • a pair of squeezing rollers receptive of a copy sheet from the developing station for squeezing same; means receptive of the copy sheet for drying same comprising a plurality of pairs of drying rollers, at
  • a device located at a height with respect to the copy sheet accumulating plane which is not greater than the minimum format length of the copy sheet and not less than one half of the maximum format length of the copy sheet.
  • a device wherein the nip of least one drying roller of each pair having the outer 5 last pair of drying rollers in said Paul is ocmed jacent to the output slit of the machine.
  • a device according to claim 1 wherein said absorbent material comprises natural leather.
  • said absorbent material comprises synthetic leather.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Pile Receivers (AREA)
US473115A 1973-06-12 1974-05-24 Copy sheet drying and delivering device for reprographic machine Expired - Lifetime US3899792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT25089/73A IT992559B (it) 1973-06-12 1973-06-12 Dispositivo perfezionato di asciu gatura e scarico di fogli special mente per macchine riprografiche

Publications (1)

Publication Number Publication Date
US3899792A true US3899792A (en) 1975-08-12

Family

ID=11215675

Family Applications (1)

Application Number Title Priority Date Filing Date
US473115A Expired - Lifetime US3899792A (en) 1973-06-12 1974-05-24 Copy sheet drying and delivering device for reprographic machine

Country Status (6)

Country Link
US (1) US3899792A (it)
JP (1) JPS5034246A (it)
DE (1) DE2426346A1 (it)
FR (1) FR2233185B1 (it)
GB (1) GB1432129A (it)
IT (1) IT992559B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5552869A (en) * 1995-09-29 1996-09-03 Minnesota Mining And Manufacturing Company Drying method and apparatus for electrophotography using liquid toners
US9335733B2 (en) * 2014-04-30 2016-05-10 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478850A (en) * 1947-03-28 1949-08-09 Gen Aniline & Film Corp Print stacking means for printing machines
US3689147A (en) * 1967-12-20 1972-09-05 Shigeru Suzuki Liquid-development type electrophotographic apparatus including paper drier means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478850A (en) * 1947-03-28 1949-08-09 Gen Aniline & Film Corp Print stacking means for printing machines
US3689147A (en) * 1967-12-20 1972-09-05 Shigeru Suzuki Liquid-development type electrophotographic apparatus including paper drier means

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5552869A (en) * 1995-09-29 1996-09-03 Minnesota Mining And Manufacturing Company Drying method and apparatus for electrophotography using liquid toners
US9335733B2 (en) * 2014-04-30 2016-05-10 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus

Also Published As

Publication number Publication date
GB1432129A (en) 1976-04-14
FR2233185A1 (it) 1975-01-10
JPS5034246A (it) 1975-04-02
FR2233185B1 (it) 1978-02-17
IT992559B (it) 1975-09-30
DE2426346A1 (de) 1975-01-16

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