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Publication numberUS3613701 A
Publication typeGrant
Publication dateOct 19, 1971
Filing dateMay 14, 1969
Priority dateMay 17, 1968
Also published asDE1925070A1, DE1925070B2
Publication numberUS 3613701 A, US 3613701A, US-A-3613701, US3613701 A, US3613701A
InventorsAndo Sadanao
Original AssigneeRicoh Kk
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for cleaning developed electrostatic photographic copy sheet
US 3613701 A
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Description  (OCR text may contain errors)

United States Patent [72] Inventor Sadanao Ando [50] Field of Search 134/15, 32, Tokyo,Japan 34, 37, 3840, 42, 64, 122; 117/37 LX; 118/637 [21] Appl. No. 824,417 LX; 355/15 [22] Filed May 14, 1969 [45] Patented Oct. 19, 1971 References Cited [73] Assignee Kabushiki Kaisha Ricoh UNITED STATES PATENTS nev 3,169,887 2/1965 York 118/637 Pnorlty y 17,1968 3,356,497 12/1967 M06 et al 117 37 J p [31] 4353225 Prrrrlary Exammer-Morns O. Wolk Assistant Examiner-Joseph T. Zatarga Attorney-Burgess, Ryan and Hicks DEVICE FOR CLEANING DEVELOPED ggssgtrizcAch'r. A devfice for clelzznrnggxcess toner from an elec- ELECTROSTATIC PHOTOGRAPHIC corv SHEET copy 5 w t alvanced 7 Cl 4 D Fi ward 1ncl1ne over a supply chamber that dlscharges cleamng aims rawmg liquid over the copy sheet to be collected in a storage [52] US. Cl 134/64, chamber. Rollers are provided to advance the copy sheet, and 117/37, 118/637, 134/15, 134/122, 355/15 the rollers act as a weir to retard the liquid flow and improve [51] Int. Cl B08b 1/02 the cleaning.

PATENTEUHBT 1 Ian INVENT OR SAD/4 NA 0 A NDO BACKGROUND OF THE INVENTION The present invention relates to a device for cleaning electrostatic photographic developed copy sheet.

Known is an electrostatic photographic or photocopying method in which a light-sensitized sheet is formed by applying a layer of photoconductor such as zinc oxide in a binding resin upon the surface of a support or substrate such as electrically insulating paper sheet; light pattern is projected upon this sensitized sheet, thereby forming an electrostatic latent image by photoelectric emission; and said electrostatic latent image is developed into a visible image by a highly sensitive developing solution containing finely divided toner having a very small particle size.

Since the photoelectric emission generated in the sensitized layer consisting of said photoconductor by the light pattern projection is very weak, a highly sensitive developing solution must be used for developing the latent image. In this case, it has been found out that the use of a developing solution having not only a high sensitivity but also high concentration of toner will bring about very satisfactory results. However, when such developing solution having a high concentration of toner is used, a large amount of toner is attached upon the front and back surfaces of the developed sheet so that the excess toner other than required for the development of the latent image must be washed off. When the copy sheet developed as described above is immersed in a cleaning liquid-to be shaken by pincette, the excess toner shakes like a string threading from the surface of the sheet. When the shaking of the sheet is stopped, the excess toner is deposited back upon the sheet so that along time will be required to wash off the excess toner in this method. Another cleaning method was tried. That is, the developed sheet is immersed in a cleaning liquid to which are applied strong vibrations generated by a ultrasonic wave generator, but the result is the destruction of the desired image. Furthermore, when the strong pressure is applied to the copy sheet by rollers or when the sheet is clamped by pincette or the like, the developed image tends to be damaged.

sheet, more copy specifically SUMMARY OF THE INVENTION In brief, the present invention provides a method and device for cleaning developed electrostatic photographic sensitized sheet in which said sheet is inclined and a cleaning liquid or solution flows or is poured over the surface of the sheet from the higher side thereof, thereby washing off the excess toner attached to the sheet.

According to the present invention, a sensitized sheet guide plate is disposed on an incline over the used cleaning liquid storage chamber so that the cleaning liquid flows from the upper or higher side of the sheet being advanced upwardly upon the guide plate, thereby washing off the excess toner attached to the sheet.

According to another embodiment of the present invention, the guide plate is so disposed as to incline upwardly in the direction of advancement of the sheet to be cleaned.

According to a further embodiment of the present invention, the guide plate is so disposed as to be inclined relative to the direction of the advancement of the sheet and to the direction perpendicular to said direction of the advancement. In this embodiment, only one cleaning liquid discharging means may be required to provide a satisfactory result and the used cleaning liquid may be directed into the storage chamber.

According to a further embodiment of the present invention, the guide plate is so disposed as to be curved relative to the direction of advancement of sheet. In this embodiment, two cleaning liquid discharging means are employed and the used liquid is directed toward the center of the curved guide plate and then into the storage chamber.

One of the objects of the present invention is to provide a method and device for washing off the excess toner attached upon the sensitized sheet developed by a developing solution having a relatively high toner concentration.

Another object of the present invention is to provide a cleaning device which can be readily made automatic if required.

The above and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawing.

BRIEF DESCRIPTION OF DRAWING FIGS. 1 and 2 are sectional views showing different cleaning devices according to the present invention;

FIG. 3 is a perspective view showing the essential part of a further embodiment of a cleaning device according to the present invention; and

FIG. 4 is a perspective view showing one example of a cleaning liquid ejecting or discharging pipe.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 to 3 showing different cleaning devices, a cleaning device 1 shown in FIG. 1 comprises a cleaning liquid reservoir 2, a used cleaning liquid storage chamber 3, the assembly of said reservoir 2 and the storage chamber 3 constituting a cleaning liquid chamber structure designated in its entirety by reference numeral 4, a guide plate 5 for copy paper disposed on an incline over the cleaning liquid chamber 4, two pairs of feed rollers 6, 7, 8 and 9 disposed across the guide plate 5 and journaled to the sidewalls of the chamber 3, a cleaning liquid circulation pump 10, a pipe 11 for communicating the pump 10 with the reservoir 2 and a pipe 12 extending from the pump 10 and opening into the storage chamber 3. A developed copy sheet 13 discharged from a developing chamber (not shown) is directed upwardly upon the guide plate 5 by the lower pair of feed rollers 6 and 7. The cleaning liquid stored in the reservoir 2 is pumped up by the pump 10 to the pipe 12 through which the flow is regulated by valve 12a to be discharged in the vicinity of the upper pair of feed rollers 8 and 9 disposed higher than the lower pair of feed rollers 6 and 7. The cleaning liquid discharged out of the pipe 12 flows over the copy sheet 13 to wash it. The lower pair of feed rollers 6 and 7 also serve as a weir for temporarily preventing the flow of the cleaning liquid so that the copy sheet 13 may be sufficiently washed and cleaned. Consequently, the excess toner upon the copy sheet 13 may be washed off and directed together with the cleaning liquid into the storage chamber 3. A pipe 14 having a regulating valve 14a for blowing heated air has an outlet disposed upstream of the upper pair of feed rollers 8 and 9 so that the washed copy sheet discharged through the upper pair of feed rollers 8 and 9 is dried and fixed by the heated air from the pipe 14.

Next referring to the cleaning device designated in its entirety by 21 in FIG. 2, this cleaning device 21 comprises a cleaning liquid chamber structure 24 consisting of a cleaning liquid reservoir 22 and a used cleaning liquid storage chamber 23, a guide plate 25 secured to the upper sidewall of the storage chamber 23 so as to extend thereover on an incline, a pair of rollers 26 and 27 joumaled to the sidewalls of the storage chamber 23 across the guide plate 25, a pipe 28 having a regulating valve 280 opens toward the higher or upper side of the pair of rollers 26 and 27, and a cleaning liquid circulation pump 30 connected to the pipe 28 and to a pipe 29 extending from the reservoir 22. A copy sheet 31 is advanced upon the guide plate 25 in the inclined state relative to the longitudinal direction thereof, that is the direction of advancement. The cleaning liquid pumped up by the pump 30 from the reservoir 22 is discharged from the opening of the pipe 28 in the vicinity of the upper side of the pair of rollers so as to wash off the excess toner and clean the copy sheet 31. The

lower side of the guide plate 25 is perforated so that the cleaning llqt lld drops into the storage chamber 23 through the perforations together with the excess toner washed off by the cleaning liquid from the copy sheet. The guide plate and 25 shown in FIGS. 1 and 2 respectively may be comprised of a fin-shaped member.

FIG. 3 shows a cleaning device of the type in which a curved guide plate 35 is disposed on an incline with respect to the direction of advancement of copy sheet 36. Pipes 37 and 38 having regulating valves 37a and 380, respectively open to the upper side of the guide plate 35 and the copy sheet 36 is advanced along the curved surface of the guide plate 35 from the lower end thereof toward the higher end while being uniformly'washed by the cleaning liquid discharged from the pipes 37 and 38.

Instead of the pipes 12, 28, 37 and 38 shown in FIGS. 1, 2, and 3 respectively, a pipe 41 having a group of small diameter holes 41a as shown in FIG. 4 may be used. The pipe 14 for blowing the heated air may be used in the devices shown in FIGS. 2 and 3 in a similar manner.

According to the method of the present invention a developed copy sheet is advanced upwardly on an incline while a cleaning liquid flows over the copy sheet from the higher side so that the excess toner may be washed off from the copy sheet. The cleaning operation may be made very rapidly and effectively always with fresh cleaning liquid without causing any damage to the image while the copy sheet is being advanced.

I claim:

1. A device for cleaning excess toner from an electrostatic to the other; roller means associated with said guide plate for feeding said copy sheet for advancement therealong, said roller means comprising two sets of rollers, a first set located above said storage chamber and a second set located above said supply reservoir at a higher level than said first set;

cleaning discharge outlet means located above said guide plate, said discharge outlet means having a connection to receive cleaning liquid from said supply reservoir and discharge the liquid to flow onto said copy sheet and into said storage chamber; and

said first set of rollers positioned to receive said liquid discharge thereagainst and act as a weir to delay the liquid flow and thereby increase the cleaning effect of the liquid.

2. A device according to claim 1 in which said guide plate is curved in its lateral dimension with its longitudinal center portion having the closest spacing to said liquid chamber, and said discharge means comprises a pair of outlets, each outlet positioned respectively on each side of said guide plate above guide plate areas spaced farthest from said liquid chamber.

3. A device according to claim 1 in which said discharge outlet means comprises a pipe having a plurality of holes therein.

4. A device according to claim 1 in which said guide plate is positioned above both said supply reservoir and said storage chamber, and said discharge outlet means is located above said storage chamber.

5. A device according to claim 4 in which drying means is located above said guide plate and said supply chamber.

6. A device according to claim 1 in which said guide plate is positioned solely above said storage chamber, and said dischar e outlet means is located above said storagechamber.

7. A evice according to claim 6 in which said guide plate IS inclined transversely relative to the longitudinal direction of advancement.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3169887 *May 4, 1961Feb 16, 1965Eastman Kodak CoElectrophotographic developing apparatus
US3356497 *Nov 9, 1964Dec 5, 1967Dow Chemical CoRinse composition and method for use thereof in electrophotographic printing
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3701337 *Dec 29, 1969Oct 31, 1972Honeywell IncPrinting apparatus
US3814517 *May 30, 1973Jun 4, 1974Repco Res Pty LtdElectrostatic copier
US3839071 *Jun 8, 1972Oct 1, 1974Honeywell IncPrinting method
US4213420 *Aug 9, 1978Jul 22, 1980Martino Peter VApparatus for processing a particulating printing plate
US4591485 *Dec 22, 1983May 27, 1986International Paper CompanyRemoving microorganisms without recontamination
US5463447 *Sep 7, 1993Oct 31, 1995Ricoh Company, Ltd.Device for removing a toner from a toner image carrier
US5474617 *Aug 31, 1993Dec 12, 1995Ricoh Company, Ltd.Image holding-supporting member and regenerating method thereof
US5545381 *Jan 31, 1992Aug 13, 1996Ricoh Company, Ltd.Device for regenerating printed sheet-like recording medium
US5605777 *Nov 27, 1995Feb 25, 1997Ricoh Company, Ltd.Adhesive state of toner on transfer paper sheet is changed to an unstable state; separating; drying
US5612766 *Apr 14, 1995Mar 18, 1997Ricoh Company, Ltd.Device for regenerating printed sheet-like recording medium
US5635005 *May 30, 1995Jun 3, 1997Ricoh Company, Ltd.Method of recycling support material for image-bearing support
US5642550 *Feb 7, 1995Jul 1, 1997Ricoh Company, Ltd.Apparatus for removing image forming substance from image holding member
US5678158 *Dec 7, 1994Oct 14, 1997Ricoh Company, Ltd.Apparatus for repetitively using a toner image carrier
US5735009 *Oct 13, 1995Apr 7, 1998Ricoh Company, Ltd.Device for removing a substance deposited on a sheet
US5753400 *Mar 21, 1997May 19, 1998Ricoh Company, Ltd.Method for repeatedly using image holding member
US5855734 *Jun 5, 1997Jan 5, 1999Ricoh Company, Ltd.Device for removing a substance deposited on a sheet
US5896612 *Mar 13, 1997Apr 27, 1999Ricoh Company, Ltd.Method and apparatus for removing image forming substance from image holding member
US6095164 *Sep 22, 1994Aug 1, 2000Ricoh Company, Ltd.Method and apparatus for removing image forming substance from image holding member
US6143091 *Sep 17, 1998Nov 7, 2000Ricoh Company, Ltd.Method for removing a substance deposited on a sheet
US6150066 *May 5, 1997Nov 21, 2000Ricoh Company, Ltd.Method and apparatus for repetitively using a toner image carrier sheet
US6156127 *Nov 6, 1998Dec 5, 2000Ricoh Company, Ltd.Method and apparatus for removing image forming substance from image holding member
US6189173Jan 3, 2000Feb 20, 2001Ricoh Company, Ltd.Device for removing a substance deposited on a sheet
USRE36963 *Feb 25, 1999Nov 21, 2000Ricoh Company, Ltd.Reusing the transfer paper sheet by removing the toner therefrom without damaging the paper fibers; apparatus comprises an aqueous solution of surfactant and water soluble polymer supplying member, separating member, and heater
USRE37197 *Aug 12, 1998May 29, 2001Ricoh Company, Ltd.Erasing printed image
Classifications
U.S. Classification134/64.00R, 118/314, 15/1.51, 134/122.00R, 118/315, 134/15, 399/149
International ClassificationG03G15/11
Cooperative ClassificationG03G15/11
European ClassificationG03G15/11