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Publication numberUS3706489 A
Publication typeGrant
Publication dateDec 19, 1972
Filing dateApr 24, 1970
Priority dateApr 24, 1970
Publication numberUS 3706489 A, US 3706489A, US-A-3706489, US3706489 A, US3706489A
InventorsMoxness James G, Nelson Harold H, O'mara Edward A
Original AssigneeMinnesota Mining & Mfg
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Copying and duplicating apparatus
US 3706489 A
An electrographic copying apparatus and process for producing copies of graphic originals utilizing the electropowder process. The apparatus comprises a pod assembly for storing a supply of a photosensitive web material and for supporting sections thereof during imaging and development. The web material during development supported on the outer peripheral surface of the pod assembly and the developing surface is conductive to permit the electric field to be developed at the developing station. The pod preferably has a flat planar surface upon which the web is placed during imaging and a curved surface where the web is placed as the pod is moved during development. The pod is adapted for supporting two imaged sections to afford the production of two copies on each revolution of the pod.
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Description  (OCR text may contain errors)

United States Patent Moxness et al.

[54] COPYING AND DUPLICATING APPARATUS [72] Inventors: James G. Moxness, St. Paul; Harold H. Nelson, West St. Paul; Edward A. OMara, Maplewood Village, all of Minn.

[73] Assignee: Minnesota Mining and Manufacturing Company, St. Paul, Minn.

[22] Filed: April 24, 1970 [21] Appl. No.: 31,732

Related U.S. Application Data [63] Continuation of Ser. No. 640,547, May 23, 1967,


[52] U.S. Cl. ..355/3, 355/64, 355/72, 95/17 [51] Int. Cl. ..G03g 15/00 [58] Field of Search ..355/3, 64, 72; 95/17 [56] References Cited UNITED STATES PATENTS 3,354,S04 ll /l 967 lones n .i95/l4 [451 Dec. 19, 1972 439,121 l0/1890 Crane ..95/17 Primary Examiner--.lohn M. Horan Attorney-Kinney, Alexander, Sell, Steldt & Delahunt [57] ABSTRACT An electrographic copying apparatus and process for producing copies of graphic originals utilizing the electropowder process. The apparatus comprises a pod assembly for storing a supply of a photosensitive web material and for supporting sections thereof during imaging and development. The web material during development supported on the outer peripheral surface of the pod assembly and the developing surface is conductive to permit the electric field to be developed at the developing station. The pod preferably has a flat planar surface upon which the web is placed during imaging and a curved surface where the web is placed as the pod is moved during development. The pod is adapted for supporting two imaged sections to afford the production of two copies on each revolution of the pod.

15 Claims, 37 Drawing Figures SHEET MM 14 PATENTED DEC 19 I972 SHEET OUUF 14 Avnwrazs PATENTED on: 19 I972 SHEET UEUF 14 VIIIIIIIIIIIIIIIIIIIIIIIIIIII I I i fla r W% 4 Mm 00 K SLR 50A WW Jflz 5 a m0 1 PATENTED DEC 19 m2 SHEET UBUF 14 QM "-0" my 9Q w www o o .HKMMNMW Mm Rn o r 5 0 QM Y 0 MW,




PATENTED 19 3.706.489 sum nau 14 ZzhMM ram m P'A'TENTED on: 19 1912 SHEET lOUF 14 EJZA JAMES .Mox/vzas's #92010 .Na so/v COPYING AND DUPLICATING APPARATUS This application is a continuation of application Ser. No. 640,547 filed May 23, 1967, now abandoned.

This invention relates to a newand improved apparatus and to a process for electrographically producing. a copy of graphic intelligence using an appropriate electronically conductive pigmented powder and an appropriate photoconductive web.

More particularly, in one aspect this invention relates to an electrophotographic, duplicating machine adapted to reproduce on plain paper oneor more co pies of a graphic original from an image of such graphic original formed on a photoconductive web carried by a pod assembly which has relative movement todeveloping and transfer stations to produce the copy or copies.

In another aspect, this invention relates to electrophotographic methods for copying graphic originals and to an apparatus for making multiple, copies of a given graphic original from a single image, thereof formed on a photoconductive web.

l-leretofore, in prior art electrophotographic;copying machines and associated methods, in order to make a copy it was necessary to form first an electrostatic,

latent image of the graphic original on a photoconductive surface, usually on the surface of a revolving drum,

by uniformly electrostatically chargingthesurface followed by exposure of the charged surfaceto thelight image to be copied. The electrostatic latent surface image is developed by attracting an electroscopicmaking-powder imagewise to the remaining charged areas of the photoconductive surface of the drum. The electroscopic powder image on the drum was then transferred to a copy sheet and later fixed. The drum surface served as an intermediate and if more than one-copy is to be made the latent image must be reformedeach time on the drum.

Before the drum surface could be reused for forming the next electrostatic latent image, an elaborate clean-.

form an image of a graphic original upon-the cylindri-.

cally curved photoconductive surface, a scanning type optical system is necessary and the. drum must be revolving. In a given apparatus, such an optical system has fixed parameters so that only predetermined types of graphic originals can be copied without'completely redesigning the optical system.

By the present invention there are provided apparatus and associated methods which overcome the shortcomings of the prior art and which provide new and improved techniques for electrographically copying graphic originals. Thus,- the presentinvention is suitable for practicing the electropowder process, which is described in French Pat. No. 1,456,993, issued Sept. 19, 1966. By the electropowder process,.a pho-.

toresponsive sheet, for example, a photoconductive surface, is exposed to alight image without preliminary electrostatic chargingtoform a differentially COIldUC-,-

tive pattern corresponding to the light image and is then contacted with an, electrically conductive,

developerpowder whilesimultaneously a suitable electric potential is applied between a conductive support or-backing for such imaged sheet and, the powder applicator sothat theimaged sheet is differentially coated with thepowder correspondingto the conductive pattern thereon. The resulting powder coated photoresponsive sheet is then contacted with a receptor sheet while simultaneously being placed'in a suitable electricfield. Theresult is that a powder image'of the graphic original is transferred from; thephotorespon-.

sive sheet-to the, receptor sheet so thata copy of a graphic original is thereby formed; When-the apparatus and methodsof this invention are. practiced, using theelectropowder process, more than one copy of a graphic, original can be made froma-single imaging operation simply by repeating-all thestepsexcept the image exposurestep.

The, present invention provides inone machine not only the capacity, to make. singlecopies of graphic originalsbut also thecapacity tomake-multiple copies of such graphic originals at relatively high speeds. The

machine, is simple to, operate, has minimum makereadytime, andhasno clean-up operation following a singlelormultiple-copying run.

Furthermore, the present invention provides ameans for projecting an imageof-a graphic original on a planar surfaceybuilt'intothe drum so'that conventional optical projectiontechniques can be employed.

Accordingly, it is theobject of this invention to'provide a new improved copyingand. duplicating apparatus.

Another'object is to providea copying apparatuswherein the photoconductive material is disposed within apodassembly, which in the iIlustrated embodiment is-a-drum means, supporting ;a,web of the photoresponsive; material and affording movement of the web relativento, a developing and ;,transfer-station. The web may be movedjabout the outer'surface of thedrum in a sequence to place unused, portions in a copying position andrewindused portions. In the embodiment illustrated herein the pod assembly is movable and carries with it thesupply and rewoundroll of the web during the copying operation.

Another-object is to provide automated apparatus and method'useful for practicing,electrophotographic copying. of graphic originals and; which is especially useful for practicing the electropowder reproduction process.

Another object is toprovide, apparatus and associated methods suitable for making multiple copies of a graphic original in good quality and at high'speeds.

Another object is to provide apparatus and methods whereby one can, once a photoconductive surface has been imaged by a graphic original using light exposure, prepare multiple copies of such graphic original from such imaged photoconductive surface in a predetermined sequence of operations without re-exposing such photoconductive surface.

l060ll 0065 Other and further objects of the present invention will become apparent to those skilled in the art from the following specification taken together with the attached drawing wherein:

FIG. 1 is a representation of the device of the present invention showing the spatial positions of the various subassemblies relative to one another;

FIG. 2 is an enlarged end elevational view of the pod assembly showing spindle drive means and web path;

FIG. 3 is aside elevational view taken from the line 3-3 of FIG. 2;

FIG. 4 is a vertical sectional view taken along the line 4-4 of FIG. 3;

. FIG. 5 is an enlarged detailed sectional view taken along the line 5-5 of FIG. 3; I

FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 4;

FIG. 7 is an enlarged detailed sectional view taken along the line 7-7 of FIG. 3;

FIG. 8'is an enlarged detailed partially sectional and perspective view taken along the line 8-8 of FIG. 4;

FIG. 9 is an enlarged detailed sectional perspective view taken along the line 9-9 of FIG. 4;

FIG. 10 is an enlarged detailed sectional view taken along the line 10-10 of FIG. 3;

FIG. 11 is an enlarged detailed sectional view .taken along the line 11-11 of FIG. 3;

FIG. 12 is an enlarged detailed sectional view taken along the line 12-12 of FIG. 3;

FIG. 13is an enlarged detail view taken through the region 13-13 of FIG. 3 and also as indicated in FIG. 14;

FIG. 14 is a vertical sectional view taken along'the line 14-14 of FIG. 13;

FIG. 15 is a horizontal sectional view taken along the line 15-15 ofFIG. 13;

FIG. 16 is an enlarged detailed sectional view taken along the line 16-16 of FIG. 2;

FIG. 17 is an enlarged detailed sectional view taken through the region 17-17 of FIG. 3;

FIG. 18 is a side elevational view of the web advance mechanism shown in FIG. 17;

FIG. 19 is a vertical sectional view of the web advance mechanism;

FIG. 20 is an enlarged fragmentary detail view of the web brake;

FIG. 21 is an enlarged fragmentary detail view showing a web metering means and grounding roll;

FIG. 22 is a detail view of the web metering means illustrated in FIG. 22;

FIG. 23 is a diagrammatic representation showing one interrelationship between a first microswitch and a first cam used in the web metering means shown in FIGS. 21 and 22;

FIG. 24 is a view similar to FIG. 23 but showing another relationship between a second microswitch and a second cam used in the web metering means shown in FIGS. 21 and 22;

FIG. 25 is a fragmentary detail view of the grounding roll and drum; v

FIG. 26 is a partially sectionalized and elevational view of a drum brake;

I FIG. 27' is an elevational and partially sectional view of the developing assembly;

FIG. 28 is a fragmentary plan view of the rollers in the developing assembly;

FIG. 29 is an enlarged vertical sectional view of the magnetic roller of the developing assembly taken along the line 29-29 of FIG. 28;

FIG. 30 is a vertical sectional view of the light-exposing means;

FIG. 31 is a plan view of the transfer assembly; a

FIG. 32 is a sectional view taken approximately along the line 32-32 of FIG. '31;

FIG. 33 is a vertical sectional'view of the transfer roll; a

FIG. 34 is an elevational view of the transfer assembly shown in FIGS. 31 and 32;

FIG. 35 is a view illustrating an operation of the copy sheet clamping mechanism employed in the transfer assembly of FIGS. 31-34;

FIG. 36 is a view similar to FIG. 35 but illustrating mechanism in a different location as the transfer roll revolves clockwise; and a FIG. '37 is a block diagram of an electrical control and programming circuit for the device of the present invention.

The operational principles of this invention will be understood by reference to FIG. 1 where there is shown a schematic side-elevational view of an apparatus constructed in accordance with the present invention. This embodiment of the apparatus is designated in its entirety by the numeral 101 and comprises several cooperating subassemblies designated in their respective entireties as a pod assembly or drum means 102, a

web imaging or image projecting means 103, an image developing means 104, sheet feeding means 105, image transfer means 106, and fusing means 107. In a duplicating apparatus or one; designed to make multiple copies a source of columnated light or light-exposing means 108 and a grounding means 109 are provided as will be hereinafter explained. These subassemblies are independently supported and positioned within a cabinet or frame 135.

The pod assembly or drum means 102 includes a generally cylindrically-shaped casing'or drum which has mounted therein a supply roll ,110 of a photoconductive web 111, and a take-up roll 112 for the same. The outer peripheral surface of the drum is formed by an imaging plate 114 which has a substantially flat exterior surface positioned within the (projected) circumferential periphery of the drum and at least one electrically isolated, electrically conductive semicylindrical pad means 115. Pad means 115 is preferably adjacent the imaging plate 114. Means (illustrated hereinafter) is provided to advance and position a portion of web 111 from roll 110 first upon plate 114 and then on the pad means 115, and means (illustrated hereinafter) is provided for rotating the drum means 102 about its axis.

The image-projecting means 103 is illustrated herein as an optical projecting system for directing a light image of a graphic original 130 onto the section of web 11 1 positioned over imaging 'plate 114.

Image developing means 104 is a system (discussed hereinafter) for applying a fusable magnetically responsive pigmented powder 120 onto the imagebearing portion of web 111 in the presence of a simultaneously applied electrical field, after said imaged portion is indexed from plate 114 to a position over pad means 115, and the drum is advanced to carry pad means 115 past said developing means. The powder 120 is at leastsemiconductive in the electrical field applied at the developing means. In the illustrated device pad means 115 comprises a pair of similar circumferentially spaced pad assemblies 169 and 170 each having electrically conductive surfaces.

Sheet feeding means 105 may be any suitable receptor feeding mechanism for feeding a copy sheet 126 from a supply thereof into the image-transfer means 106.

Image-transfer means 106 is a system (illustrated hereinafter) affording the transfer of a developed powder image from web 111 to a receptor or copy sheet 126.

Fusing means 107 receives copy sheet 126 from image-transfer means 106 and fuses the powder 120, transferred or deposited in an imagewise pattern onto sheet 126 as by heating.

The light-exposing means 108 includes a source of light mounted within a housing formed to permit exposure of the developed web to light, essentially all rays emitted being parallel and directed to impinge on the pad means 115 across at least the full width of the web 111. At this light-exposing means or station 108 the previously light exposed areas of the web 111 which have no developer powder retained thereon are re-exposed making such areas of optimum conductivity when web 111 is photosensitive.

The grounding means 109 includes a roller engageable with the web 111 as it is carried past the transfer means 106, which roller serves to bleed off any charges which have built up on web 111 or on the conductive surface of pad means 115. In making multiple copies this grounding means 109 reduces the state of charge so that the web will be presented to the developing means 104 at the same electrical condition on each cycle.

For use with a photoconductive material as the intermediate web the operation of apparatus 101 is as follows. A predetermined section or length of photoconductive web 111 is placed on imaging plate 114 as a result of it being advanced (e.g. translated or indexed) from supply roll 110 through a slot in the cylindrical drum surface onto said imaging plate 114. A light image of a graphic original 130 is projected by image projecting means 103 onto the web at the imaging plate 114, thereby producing on the so-exposed section of web 111 a differentially conductive pattern corresponding to the projected image. The resulting exposed section of web 111 is then moved from imaging plate 114 onto pad means 115 of the drum means 102 by advancing web material from the supply roll and rewinding a portion of the web on the take-up roll. Next, the drum means 102 is rotated (counterclockwise as viewed in the drawing) so that the image section of web 111 and pad means 115 are moved together past the development means 104 where the powder 120 is applied in a series electrical circuit arrangement with an appropriate electrical potential'to the non-light struck or image-forming areas on the section of web 111 disposed on the pad means. The powder will adhere to the web 111 corresponding to the pattern of the visible graphic original 130. Continued rotation of the drum carries the developed image past the exposing means 108 which re-exposes the areas of the image having no developer powder thereon.

As the resulting powder-developed pattern on web 111 advances upon rotation of the entire drum means 102 to the image-transfer means 106, a copy sheet 126 is fed from sheet-feeding means 105 into imagetransfer means 106 to be aligned, registered, and placed in face-to-face contact with the image section of the web. During continued rotation and while the web section is progressively placed in contact with the copy sheet the powder developed image on web 11 1 is transferred, in the presence of a second electrical potential to the surface of copy sheet 126 in an imagewise pattern corresponding to that of the graphic original 130. As the copy sheet leaves the image-transfer means 106 it is picked up by the fusing means 107 where the powder is fused to the copy sheet 126, thereby completing the production of a first copy from the graphic original 130. The drum, upon continuing its rotation passes grounding means 109 to short out" or remove any charges built up on the surface of web 11 1.

If more than a single copy is desired, drum means 102 continues to rotate without being reimaged at the image-projecting means 103, so that the image area of web 111 again passes, sequentially the development means 104, exposing means 108 and moves to transfer means 106, whereupon an additional copy sheet is fed in timed relationship from sheet feeding means 105 to transfer means 106 and through the fusing means 107. The operation is repeated until the desired number of copies have been made. At the completion of a duplicating operation, the drum means 102 returns to a home or base position (e.g. a position such as illustrated in FIG. 1) where another copying operation can be undertaken as desired.

This embodiment will now be described in detail.

Image Projecting Means The imaging means 103 comprises a transparent supporting stage 131 upon which the original may be placed, illuminating means for the stage and original in the form of suitable lamp and reflector assemblies 132, a pair of first surface reflectors. 133 and 134 and projection lens means 136 positioned between said reflectors. The reflectors 133 and 134 and the lens means 136 project and direct a light image of the original to a particular area on the surface of drum means 102, which area is on the imaging plate 114. A shutter is disposed relative to the projection lens means 136 to control exposure. The shutter is controlled from a timer to afford the proper exposure and the imaging system projects an image of the entire original onto the web when the shutter is open.

Drum Means: Frame and Drive FIGS. 2 through 16 show one embodiment of a drum means 102. In this embodiment the drum means is defined by the combination of a pair of circular, spaced, parallel, axially aligned end walls 141 and 142 (see FIG. 3), which are maintained in fixed spatial relationship to one another by threespanner members 146, 147 and 148 (see FIG. 4), each of which is duly secured to an adjoining end wall 141 and 142 by appropriate means, such as screws 149 or the like. Each end wall 141 and 142 and each spanner member 146, 147 and 148 is formed of a nonconductive plastic, such as phenolic resin, or the like. Observe that the exterior surface portions of spanner members 146,147 and 148 are each formed so as to have curvatures corresponding to the radius of curvature of the spaced end walls 141 and 142.

Affixed'one on each end wall 141 and 142 so as to lie on the axis 139 of the drum are a pair of aligned, outwardly oppositely extending stub shafts 153 and 154,

'respectively (see FIG. 4). Stub shafts 153 and 154 are a stub shaft 154 and the entire drum means 102 is driven by means of an electric motor 156, through the image transfer means 106 by an interconnecting timing belt 157, in timed relation with said image transfer means.

Mounted in and between end walls 141 and 142, and circumferentially spaced from one another are two similar guide roller assemblies 161 and 162 and a third guide roller assembly 165. Each of the assemblies 161 and 162 is located such that its respective roller surface I portion is parallel to the axis of the side walls and substantially flush with the adjacent peripheral edges of end walls 141 and 142. Construction details of the guide roller assemblies 161 and 162 are described I below.

Circumferentially spaced from guide roller assemblies 161 and 162 is capstan assembly 163 which is mounted between end walls 141 and 142. Capstan assembly 163 is located both so as to have its axis parallel to the axis of the drum means, and so as to have its circumferential surface portions generally aligned with the adjacent peripheries of respective end walls 141 and 142. constructional details of capstan assembly 163 are described below. I

Positioned within theinterior of drum means 102 and mounted between end walls 141 and 142 are a pair of spindle assemblies, one being designated as supply.

spindle assembly 144, and the other being designated as takeup spindle assembly 145. These spindle assemblies 144 and 145 are each positioned so as to have their respective axes parallel to the axis of the drum means 102. The spindle assemblies 144 and 145 are so spaced from one another that a supply roll 110 of the web 111 can be mounted on spindle assembly144 and be transferred to spindle assembly 145 without interferring with the operation of each other. Constructional details of each spindle assembly 144 and 145 are described below.

Referring to FIG. 6, there is seen a vertical cross sectional view of guide roller assembly 161. Assembly 161 is shown to have a dead shaft 188, which is mounted between end walls 141 and 142, respectively, by a pair of shoulder bolts 189. Centrally journaled on dead shaft 188 by means of a pair of bearing members 191 is roller 192 conveniently formed of steel or the like. Adjacent each opposite end of roller 192, and spaced therefrom by a thrust washer, is journaled one end of a pair of angle members 196 and 197 respectively (which together provide a pivotal or hinge support for the imaging platform or plate 114 as below described). Retainer clips maintain the roller 192 centered on dead shaft 188. Guide roller assembly 162- in this embodiment is similar to guide roller assembly 161 except, of course, the angle members 196 and 197 are absent.

The web guide roller assembly 165 (see FIG. 16) comprises a dead shaft 198, mounted between axially spaced projections 180 by bolts 199, the heads of which are accommodated in grooves formed in the end walls 141 and 142, and a roller 200 journaled on the shaft 198 by suitable bearings as best shown in FIG. 20. The roller formed of steel and covered with a layer of resilient material having a high friction coefficient like natural rubber.

Drum Means: Imaging Platform In drum means 102 (see FIGS. 3, 4, and 6), located between guide roller assembly 161 and capstan assembly 163, and between and entirely within the periphery of both end walls 141 and 142, is the planar imaging plate 1 14 which has a planar base member 201 with a pair of rigiditizing channels having upright portions 202 and 203 disposed along opposite sides thereof. Upright portions 202 and 203 are formed so as to fit within the periphery of the end walls 141 and 142 in the assembled drum means 102. On one end of base member 201, and secured to one .end of each upright portion 202 and 203, is a hinge formed by the angle members 196 and 197, (FIGS. 3 and 4) which are,

themselves journaled at one end for pivotal swinging DRUM MEANS: PAD ASSEMBLIES Between guide roller assemblies 161 and 162, and also between guide roller assembly 162 and capstan assembly 163 are the padassemblies 169 and 170,

v respectively. The pad assemblies 169 and 170 form circumferentially spaced portions of a circumferentially extending surface of the drum between end walls 141 and 142. Each pad assembly'169 and 170 comprises a circumferentially extending member 210 (see FIGS. 4, 8 and 9) formed of an electrically conductive material, and has a raised central surface area which supports the web material 1 11. A layer 211 of a low friction electrically conductive material is suitably'secured to and covers the raised area of the conductive member 210 to allow easy movement and smooth operation of the photoconductiveweb 111 over its surface. When web 111 has an electrically conductive backing to serve as the field electrode, layer 21 1 may be thin paper.

In the case of pad assembly 169, an angle or rib member 175, of metal or the like, is fastened along its opposite side edges to member 210 to secure the member to the end walls 141 and 142 (FIG. 8) by convenient fasteners such as bolt and nut assemblies 214 and cap screws 216, respectively. Axially extending end members 217 and 218 join the ribs 175 at the ends of the pads (FIG. 4). The pad assemblies 169 and 170 are substantially similar except that the assembly 17 0 is hinged to the side walls and therefore the ribs extend beyond member 210 at each end to forma hinge or pivot at one end, in conjunction with opposed pins 179 as illustrated in FIG. 4, and to support the guide roller assembly 165 at the opposite end. A pair of opposed pins 181 (FIG. 4) extend towards one another through the end walls 141 and 142 and the ribs 175 of pad 170 to secure the pivotal pad assembly 170 in operating position. These pins 181 may be similar to pins 208 and 209 and may easily be withdrawn from the ribs 175 affording pivotal movement of the entire pad assembly 170 and the guide roller assembly 165, thereby providing access to the interior of drum means 102. Circumferentially extending slots are formed at each end of spanner member 146 so that swinging movements of the pad assembly 170 are not impeded.

Electrical contact can conveniently be made with the members 210 of pad assemblies 169 and 170 by means of a wire lead (not shown) secured to a screw. Electrical contact is made with the drum by conventional sli rings (not shown). I

Drum Means: Supply and Take-Up Spindles Referring to FIG. 10, there is seen a vertical crosssectional view of supply spindle assembly 144. Assembly 144 employs a driven shaft 226, one end 227 of which has a shoulder formed thereon for axially supporting a center bored circular end cap or core supporting collar 228. A nut 229 isthreadably received on shaft 226 adjacent end 227 to releasably retain the collar 228 on the shaft 226.'Shaft 226 is reduced adjacent its other end 231 to provide two shoulders 233 and 234 to snugly fit in the bore of a collar 235 which is pressed against shoulder 233 and to be received in a suitable bearing 236. Bearing 236 is mounted within a threadably mounted bearing support 237 which'support is mounted in a threaded cap 238 fixed on end wall 141. The support 237 is manually adjustable by an exterior flange 239 having circumferential knurled edge portions. In aligned opposed relationship with the axis of bearing support 237 and mounted through an aperture in end wall 142 is a second bearing support 241. The bearing support 241 supports a pair of aligned bearings journaling one end of a stub shaft 243, the other end of which is shouldered and formed with a keyway to fixedly support a pulley 245 thereon. The pulley 245 is formed with an axially extending tapered hub portion which mates an interior chamfer formed on the collar 228 as shown. The resulting relationship between stub shaft 243 and driven shaft 226 is such that, when the entire spindle assembly 144 is duly mounted between end walls 141 and 142, shafts 243 and 226 are coaxial with one another and pulley 245 frictionally drives collar 228 and a supply roll core 247.

The core 247 is conventionally formed of cardboard and has an axially extending slot formed in one end to ensure driving engagement with the collar, such as 228 which may have an axial rib engageable with said slot. To remove a core 247 and a roll 110 of the web 111 from the assembly 144, bearing support 237 is threadably moved in cap 238 outwardly until the bearing 236 and shaft 226 are axially separable. Then collar 228 can be separated from pulley 245 and shaft 226, core 247 and collars 228 and 235 are removed from the drum means 102. When they are removed, the nut 229 can be removed and collar 228 slipped off the shaft 226. The core and web may then he slipped off the 3077 O Ois E Mom shaft. To mount a fresh supplyroll of web material 111 on the assembly 144 a reverse procedure is followed but care is used to align the slotted core with the rib on the collar 228.

As will be appreciated from the subsequent description herein, in accordance with the teachings of this invention, a supply roll 110 (not shown in FIG. 10) comprises a wound web of photoconductive material 111 on a core 247. Thus, when pulley 245 is rotated, core 247 rotates advancing photoconductive web 111 therefrom or rewinding photoconductive web thereon, depending upon the direction of rotation.

Referring to FIG. 11, there is seen a vertical crosssectional view of take-up spindle assembly 145. Assembly 145 has a shaft 251 supporting a take-up drum 252 having axially spaced end caps 253 and 254 press fitted on the shaft 251. A pulley 255 is keyed to shaft 251 adjacent the cap 254 to drive the drum 252. The opposite ends of the shaft 251 extend beyond the ends of the drum 252 and pulley 255 and are suitably supported by bearings and bearing supports in the end walls 141 and 142. This take-up spindle assembly 145 winds the web-111 after it has been advanced around the outer peripheral surface portion of drum means 102.

Drum Means: Web Drive A capstan and guide roller combination provide means for advancing the web 111 from the supply roll assembly to the outer surface of the drum means 102.

Referring now to FIG. 12 there is seen a vertical cross-sectional view of capstan assembly 163. Assembly 163 comprises a roller 261 formed by a rigid core 262 which has a uniform coating 263 of resilient material, such as a neoprene synthetic rubber, or the like. Mounted within each end of core 262 is an end cap 264, which caps are fixed on a shaft 265. A pair of bearing supports 266 and 267 are mounted in aligned axial relationship to one another through end walls 141 and 142, respectively, and each bearing support is suitably fixed to its respective end wall. The shaft 265 extends through bearing support 267 and the extended portion has a pulley 268 axially mounted thereon by suitable means, for example, a wedge tightener 269 and a key (not shown). The pulley 268 thus affords a drive means for the capstan or roller 261.

Guide roller means are provided adjacent the surface of the roller 261 to maintain web 1 1 1 in driving engagement with a substantial portion of the driven roller 261. In the present embodiment the guide roller means is a roller 270 (see FIGS. 3, 4, 13, 14 and 15), which is rotatably mounted on a dead shaft 272. The dead shaft 272 supported by independently adjustable brackets 273 is mounted on the end walls 141 and 142. The roller 270 has a rigid core coated on the outer circumferential surface with a resilient elastomeric material, such as natural or synthetic rubber, giving the roller a dense high coefficient of friction surface.

The brackets 273 each comprise a base plate 276 secured to the associated drum end wall by means of screws 277. One end of each base plate 276 is located so as to be adjacent the roller 261 of the capstan assembly 163, each such end being characterized by an inturned ear 278 (see FIGS. 13 and 14). The base plate 276 is also formed with opposed flanges 279 and 281

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3826570 *Dec 3, 1973Jul 30, 1974Addressograph MultigraphPhotoconductor-carrying drum assembly
US3834808 *Jul 23, 1973Sep 10, 1974Canon KkElectronic photographic copying machine
US3848204 *Sep 21, 1973Nov 12, 1974Xerox CorpPressure adjustable electrophotographic printing machine transfer apparatus
US3907421 *Feb 22, 1974Sep 23, 1975Xerox CorpTransfer apparatus for electrostatic reproducing machines
US3926515 *Jul 19, 1973Dec 16, 1975Ricoh KkPhotoreceptor changing apparatus for electrophotographic copying machines
US3935584 *Jul 12, 1974Jan 27, 1976Rudolf Hell GmbhDevice for handling photographic film between a cassette and an exposure reproduction apparatus
US3982830 *Dec 6, 1974Sep 28, 1976International Business Machines CorporationMagnetic bead carryout reduction by altering the developer's bias voltage
US4063809 *Sep 27, 1976Dec 20, 1977Pitney-Bowes, Inc.Photoconductor support drum for photocopy machine
US4068942 *Oct 14, 1975Jan 17, 1978Xerox CorporationAdvanced photoreceptor
US4147128 *Dec 23, 1977Apr 3, 1979Agfa-Gevaert AgApparatus for cleaning and developing dielectric receptor sheets
US4341464 *Feb 17, 1981Jul 27, 1982Oce-Nederland B.V.Reproduction apparatus employing a cassette with a finite belt
US6058282 *Sep 21, 1998May 2, 2000Eastman Kodak CompanyElectrostatographic apparatus using alloyed zirconia ceramic providing image receiving surface
US8615185 *Oct 23, 2007Dec 24, 2013Hewlett-Packard Development Company, L.P.Device for holding a photoreceptor sheet
US20110182622 *Oct 23, 2007Jul 28, 2011Avichay Mor-YosefDevice for holding a photoreceptor sheet
EP0035297A1 *Feb 16, 1981Sep 9, 1981OcÚ-Nederland B.V.Reproduction apparatus provided with a cassette for a finite belt
EP0044919A1 *Jun 3, 1981Feb 3, 1982International Business Machines CorporationXerographic machine employing photoconductive imaging belt
U.S. Classification399/161, 399/384, 396/31, 355/64, 399/167, 355/72
International ClassificationG03G15/00, G03G15/09, G03G21/06, G03G15/26
Cooperative ClassificationG03G15/263, G03G21/06, G03G15/0935
European ClassificationG03G15/09E2, G03G21/06, G03G15/26B