US3826570A - Photoconductor-carrying drum assembly - Google Patents

Photoconductor-carrying drum assembly Download PDF

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Publication number
US3826570A
US3826570A US00421258A US42125873A US3826570A US 3826570 A US3826570 A US 3826570A US 00421258 A US00421258 A US 00421258A US 42125873 A US42125873 A US 42125873A US 3826570 A US3826570 A US 3826570A
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assembly
photoconductor
set forth
frame structure
take
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US00421258A
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J Kolibas
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AB Dick Co
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Multigraphics Inc
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Publication of US3826570A publication Critical patent/US3826570A/en
Priority to JP49136353A priority patent/JPS5090339A/ja
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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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/26—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection
    • G03G15/263—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection using a reusable recording medium in form of a band

Definitions

  • ABSTRACT A photoconductor-carrying drum assembly comprising a plurality of frame structures each with a pair of pivotal support members which normally mate together to define a curved surface with a flexible photoconductor element resting thereon.
  • the support membersof each frame structure swing inwardly when the structure reaches a predetermined angular position upon rotation of the drum assembly, whereby the photoconductor element assumes a substantially planar configuration for exposure.
  • Each photoconductor element extends between supply and take-up spools carried by the frame structure together with a mechanism for periodically advancing the photoconductor in the imaging area.
  • the present invention is generally related to electrophotography and, more particularly, to a drum assembly for use with an electrophotographic reproduction apparatus and which carries an advanceable web of flexible photoconductor and includes means for flattening the photoconductor during exposure.
  • Another object of the present invention is to provide a versatile photoconductor-carrying drum assembly which is capable of periodically providing a portion of flattened photoconductor for flash exposure, yet is of relatively simple, highlyreliable construction which is economical to manufacture and maintain.
  • Still another object of the present invention is to provide a compact drum assembly comprising a pivotal support structure defining a normally curved support surface for a flexible photoconductor, the support structure being periodically pivoted inward toward the axis of drum rotation, whereby the photoconductor assumes a planar configuration for flash exposure.
  • Yet a further object of the present invention is to provide a photoconductor-carrying drum assembly includ ing a pair of support doors which are folded inwardly in response to rotation of the drum assembly to a predetermined angular position, thereby presenting a flattened photoconductor element to a flash exposure station.
  • Still another object of the-present invention is to provide a unique photoconductor-carrying drum assembly including a mechanism for'incrementally advancing or creeping the photoconductor element to incrementally remove fatigued portions of the photoconductor from the image area, each advancement occurring after a predetermined number of copycycles.
  • FIG. 4 is a partial plan view of thedrum assembly takenalong section 44 of FIG. 3; 4
  • FIG. 5 is a partial end view of the drum assembl showing the associated. cam plates
  • FIG. 6 is an exploded perspective view of a first embodiment of the photoconductoradvance mechanism associated with the drum assembly
  • FIG. 7 is a sectional view of the photoconductor advance mechanism illustrated in FIG. 6;
  • FIG. Si is a simplified end-view of the drum assembly as utilizing the advance mechanism shown in FIG. 6 together with an arcuate actuation member;
  • FIG. 9 is a partial side elevation of the drum assembly and actuator illustrated in FIG. 8;
  • FIG. 10 is an end view of a single frame structure of the drum assembly provided with a second embodi ment of the advance mechanism
  • FIG. 11 is an exploded perspective view of the frame structure and advance mechanism illustrated in FIG.
  • FIG. 12 is a side elevation of the mechanical counter and advance ratchet illustrated in FIG. 11, with secprovide a flattened phototions removed;
  • FIG. 13 is a sectional view of the tensioning mechanism associated with the supply spool shown in FIG. 11
  • a typical electrophotographic reproduction apparatus is generally indicated by the numeral and includes a rotatably supported drum assembly 22 mounted in a housing 24.
  • the drum assembly is operatively connected to a drive motor, not illustrated, which effects controlled rotation of the drum'assembly in a clockwise direction as indicated by arrow 26.
  • the drum assembly is comprised of four quadrants or sections 28, 30, 32 and 34, each of which carries its own photoconductor element which defines a corresponding image area, as hereinafter explained.
  • An' initial charging station may ,bedefined by a conventional corona discharge unit 36, or equivalent device, which provides a uniform charge onthe surface of the photoconductor element prior toexposure.
  • a flash exposure station is provided with a pair of flash lamps 40, preferably of the xenon type, which irradiates a document 42 resting upon a transparent window 44 in face-down orientation; This provides an image of light and shadow which is projected by a stationary lens 46 onto an image plane 48, which coinsides with the photoconductor element which is of a planar configuration during exposure.
  • the next station in the direction of rotation'of drum assembly 22 is adeveloper unit 50, of a conventional type, which applies toner particles to the latent image pattern on the associated photoconductor element to define a developed image. Subsequent to development,
  • the finished copy is then transported by appropriate means, not illustrated, to a output hopper,
  • a cleaning station including a pre-clean'corona unit 60 which schens the remaining toner particles, and a cleaning unit 62which brushes the toner particles from the surface of the photoconductor element.
  • the drum, assembly of the present invention provides a plurality of image areas spaced around its circumference, whereby the various process stations may be operated concurrently to provide a high copy production rate.
  • the exposure operation can be carried out at quadrant 28 while the development operation is taking place at quadrant 30, together with the transfer and cleaning operations at quadrants 32 and 34, respectively. Since exposure is achieved by a flash, rather than scanning, the drum may be rotated at a high rate of speed which significantly enhances the copy production rate of theimachine.
  • each quadrant or section of thedrum assembly is defined by an independent framestructure that they define a curved support surface for a flexible photoconductor element 78.
  • photoconduc-' torelement 78 is in the form of an elongated web extendingbetween a supply location and a take-up location in the associated frame structure and includes a layer of organic photoconductor, such as polyvinyl benzocarbazole, on a base of alluminized Mylar of approximately 3 to 5 mils thickness.
  • the portion of the photoconductor element which overlies support members 64 and 66 defines an image area which is normally of curved, part-cylindrical configuration. During the flash exposure operation support members 64 and 66 are moved inwardly, whereby the photoconductor element assumes a substantially planar configuration, as hereinafter explained.
  • Each of the frame structures is mounted to a common hub 92 which is provided with a pair of dovetails 94 and a group. of key fins 96 which cooperate with key ways 98 and 100m end plates 68 and 70. This provides convenient installation and removal of each frame structure from the hub permitting each frame structure to be removed independently 'of the others.
  • Each frame structure may be secured in place against axial movement by a stop member 102 and lock tab 104, or other appropriate fastening means.
  • each frame structure is achieved by way of cam followers 80 and 82 which are disposed outboard of end plate 68 and are carried by mounting pins 84 and 86 asso ciated with support members 64 and 66, respectively.
  • the mounting pins extend through appropriate slots 88 and 90 formedin the end plate.
  • each frame structure is normally disposed in their outer positions, whereby they mate together to define the curved support surface for the photoconductor element.
  • each frame structure is provided with a pair of leaf-spring members 106 and 104 mounted to end plate 68 with movable end portions which retentively' engage mountingpins 84 and 86 to normally retain the support members in their outer positions.
  • Each of the cam followers 80 and 82 travel in circular path with the drum assembly until it engages a cam surfaceassociated with a group of cam plates .110, 112, 114 and 1.16, illustrated in FIG. 4 and 5.
  • the cam plates are effective to overcome the retaining forces of leaf-springs 106 and 108, allowing support members 64 and 66 to move inwardly toward the axis of drum rotation to a collapsed or folded position as illustrated in the uppermost quadrant of FIG. 3. lnward movement of the support members is accompanied by a corresponding disengagement from the intermediate portion of the photoconductor web 78, permitting it to assume a substantially planar configuration for flash exposure. Since the length of the intermediate portion of the photoconductor web is somewhat less when in the planar configuration than when in the curved configuration, appropriate tensioning means are provided for pulling the web taut during collapse of the support doors. Typical embodiments of the tensioning mechanism are hereinafter described.
  • cam plates 110, 112, 114 and 116 are shown in solid line, while portions of the drum assembly being shown in phantom for the sake of clarity.
  • the surfaces associated with the cam plates define a pair of distinct paths for followers and 82 to appropriately time the opening and closing of support members 64 and 66 such that the photoconductor element assumes a planar configuration when the drum assembly is at a predetermined angular position corresponding to the exposure operation.
  • the cam surfaces carefully control the movement of the doors relative to each other to assure clean engagement and disengagement therebetween.
  • cam followers 80 and 82 enter the cam paths at an area generally indicated by the numeral 118.
  • the folding operation is initiated by engagement of follower 80 with cam'surface 120 defined by plate and axially spaced from a corresponding cam surface 122 associated with cam plate 112. Since follower 80 engages the cam plate prior to follower 82, it may be referred to as the leading cam follower, with the corresponding cam surfaces being referred to as the leading? cam surfaces.
  • follower 82 is herein referred to as the trailing cam follower, and the corresponding cam surfaces are referred to as the trailing cam surfaces.
  • Leading cam surface curves radially inward toward the axis of drum rotation, whereby it is effective to influence leading follower 80radially inward sufficiently to overcome the retaining forces of leaf-spring 106. Subsequent to release from leaf-spring, support member 66 continues to pivot inwardly under the influence of gravity with follower 80 riding along cam surface 124. The leading cam surface curves radially outward at a point indicated at 126 and is effective to influence follower 80 outwardly to return of support member 66 to its original position subsequent to exposure. Returned to the original position occurs when follower 80 reaches theapex of the leading cam surface as indicated at 128. At this position, leaf-spring 106 is effective to retain support member 66 in its outermost position during the development, transfer, and cleaning operations explained above. v
  • trailing follower 82 engages the trailing cam surface at 122 to initiate inward movement of trailing support member 64.
  • follower 82 is axially spaced from cam follower 80 and follows a path which is separate from the leading cam path. Plates 112 and 116 provide a pair of parallel cam surfaces, generally indicated by the 'numerals 130 and 132, which define the trailing path. Cam surface 132 is shaped to prevent trailing support member 64 from striking member 66 during each cycle for exposure. After exposure, the trailing cam surfaces influence follower 82 outward to return support member 64 to its original position in engagement wiht support member 66.
  • cam surfaces accurately control movement of the support members of each frame structure as the drum assembly is rotated.
  • the present invention be limited to the cam configurations illustrated in H0. 5 as various types of appropriate cams may be utilized, if desired.
  • a first embodiment of the photoconductor advance mechanism of the drum assembly is illustrated.
  • this mechanism is intended for advancing the photoconductor termined number of copy cycles.
  • the mechanism may be readily adapted for advancing the photoconductor a lessor or greater distancethan a single image area.
  • the photoconductor web extends from a supply spool 134, through a pair of supply control rollers 136 and 138, over the support members 64 and 68, between take-up control rollers 140 and 142, to a take-up spool 144. Advance of the web is effected by controlled rotation of.roller 142.
  • coller 142 serves to provide the appropriate tension'ing of the web when the support members are folded inwardly during exposure, whereby the intermediate portion of the web assumes a substantially planar configuration.
  • This tensioning is provided by a coil spring 146 with its inner end 148 affixed to shaft 150 by way of aslot 152, or other appropriate fastening means.
  • Roller 142 is affixed to shaft 150 for rotation therewith, together with a gear 154 in meshing engagement with gear 156 associated with roller 140. Both rollerj140and gear 156 are rotatably mounted to a supexposure the excess intermediate portion of the web is taken up by spring 146 which rotates roller 142 in a clockwise direction.
  • the photoconductor web is prevented from creepingforward due 8 spring is fixed to a toothed drive pulley 174 for rotation therewith.
  • a toothed belt 176 driving ly connectspulley 174 with a toothed advance pulley 178.
  • Drive pulley 174 is rotatably mounted to the end of shaft 150 and is provided with a pin 180 which engages a corresponding finger 182, associated with shaft 150, when the spring is fully wound. Since the inner end 148 of the coil spring is affixed to shaft 150 and the outer end 172 is affixed to drive pulley 174, rotation of the'drive pulley independent of shaft 150 is effective to wind the spring.
  • pin- 180 engages fingers 182 causing the drive pulley' and shaft 150 to rotate in unison in a clockwise direction. This occurs during advance of the photoconductor, as hereinafter explained.
  • support membersssupport member 66 is provided with a lever arm 184 which carries a pin 186 extending between the legs of a bifurcated member 188,.
  • a nylon bushing 190 is mountedto a shaft 192 and carries member 188 in frictional engagement under the influence of adjustable clamp bolt 1,94.
  • Shaft 192 is supported by a one-way bearing 1 96, of a conventional type, which permits rotation of the shaft in a clockwise direction only.
  • Shaft 192 is provided with a hollow or bore which is frictionally engaged by an expandable nylon shaft 198, as indicated at 200 in FIG. 7.
  • This frictional engagement may be adjusted by a screw 202 which is threaded into shaft 198 such that tightening of the screw causes the shaft to expand outwardly to increase its frictional engagement with the interior of shaft 192.
  • Shaft 198 is also provided with a pair of drive fingers 204 which operatively engage appropriate key ways 206 formed in take-up spool 144.
  • the spring winding operation may be described as follows.
  • bifurcated member 188 is rotated slightly counterclockwise. This movement is lost motion, as one-way bearing 196 prevents hollow shaft 192 from rotating in a counterclockwise direction.
  • the clamp nut 166 is adjusted to provide sufficient drag to prevent creeping of the photoconductor, yet allow advancement of the photoconductor under control of the advance mechanism, as hereinafter explained.
  • spring 146 be sufficiently wound to effect take up of the excess when the doors are swung inwardly. This is achieved by winding the spring each time thesupport doors, are cycled. An outer end portion 172 of the coil position, member 188 is rotated slightly in a clockwise direction. Normally, this motion is transmitted to shaft 192, which in turn causes rotation of advance. pulley 178 and drive pulley 174 through belt 176. Thismovement winds the coil spring 146 in a clockwise direction. Each operation of the support door winds the spring slightly until pin engages finger 182, at which time the spring is fully wound. Cycling of the doors subsequent to full winding of the spring causes bifurcated member 188 to slip on nylon bushing in both the clockwise and counterclockwise directions.
  • FIGS. 8 and 9 disclose a typical arrangement for effecting advancement of the photoconductor through rotation of drive pulley 174.
  • An arcuate actuation member 208 is supported by appropriate means, not illustrated, and is operatively connected to a solenoid 210.
  • a control circuit associated with the copy machine is connected to solenoid 210 byway of leads 212 for energization of the solenoid, for example, after a predetermined number of copy cycles.
  • the control circuit may include means for otherwiseenergizing the solenoid, such as an Advance push button to effect manual advancement in the event of damage or excessive wear to the photoconductor.
  • Actuation member 208 is provided with a plurality of gear teeth 214 arcuately disposed on the lower side of the actuation member todefine an arcuate rack.
  • Drive pulley 174 is considerably wider than belt 176 to provide an exposed portion 216, illustrated in FIG. 9, which underlies actuation member 208.
  • the actuation member is normally disposed in a position shown in solid line in FIG. 8.
  • solenoid 210- When solenoid 210-is energized, the actuationmember is moved downward to a position shown inphantom in FIG. 8 at 208a. In thisposition, rack teeth 214 drivingly engage the teeth of drive pulley 174. With the drum assembly rotatingin a counterclockwise direction, drive pulley 174 is driven in a clockwise direction.
  • This operation effects advancement of the photoconductor, with the amount of advancement being determined by the length of the arcuate rack.
  • the solenoid maybe energized for an'entire revolution of the drum assembly, whereby all :four of the photoconductor webs are advanced in a single operation.
  • the solenoid energization may be only mementary, whereby a single quadrant photoconductor is advanced.
  • the photoconductor advance arrangement illustrated in FIGS. 8 and 9 is not limited to the actuation member being mounted directly above the drumv assembly. lt may be more suitable to mount the actuation member to one side or the other, or beneath the drum assembly, such that advancement occurs while the photoconductor is in the curved configuration.
  • FIGS. 10 and 10 direction to take up any slack photoconductor which has been advanced by rollers 222 and 224.
  • a drive ratchet 228 which is keyed or otherwise affixed to the drive shaft 220 to effect rotation thereof by way of a drive pawl 230 after the counter completes the preselected number of copy cycles.
  • Pawl 230 is spring biased toward the teeth of ratchet 228, but normally is prevented from driving engagement therewith by a main counter wheel 232 provided with a single ratchet tooth 234.
  • the drive pawl is enabled to advance drive ratchet 228 upon the next cycle of the support doors.
  • the mechanism is also provided with an adjustable advance cam I position as'illustrated in FIG. 11.
  • a second embodiment of the photoconductor ad- 236 which determines the length of each incremental advancement of the photoconductor web.
  • a pin or finger 240 is mounted on pawl 230 and rides on a cam surface 238 to prevent operative engagement of the drive pawl with the teeth of ratchet 228 through portion of the advance stroke.
  • drive pawl 230 is permitted to operatively engage the teeth of ratchet 228. That portion of the stroke during which the drive pawl is held inoperative may be set by adjusting the angular position of cam 236 by way of bolt 242 which'cooperates with an arcuate slot 244 in the cam.
  • Drive pawl 230 is mounted to an advance shaft 246 carried by a pawl drive lever 248.
  • a counter advance pawl 250 is also mounted to shaft 246 and is appropriately spring biased toward a counter advance ratchet 252.
  • a drive gear 254 is attached to support door 66 for movement therewith and meshes with a driven gear 256 which is rotatably mounted about drive shaft 220 by way of a bushing 258, as best illustrated in FIG. 12.
  • Drive lever 248 is mounted to bushing 258 and rotates with gear 256.
  • the gearing is such that when support door 66 is in itsnormal outer position, drive lever 248 is in its lower doors-are pivoted inward, drive lever 248 is pivoted in a counterclockwise direction to a position shown in dash line at 248a in FIG. 10. As the support doors move outwardly, pawls 230 and 250-are moved downward. Each downward stroke of the counter pawl 250 is effective to advance counter ratchet 252 a preselected number of teeth.
  • a counter rate cam 259 similar to cam 236, engages a pin 260 of pawl 250 to prevent pawl s engagement with ratchet 252 during a portion of each stroke.
  • the angular position of cam 258 may be adjusted by way of bolt 242.
  • a pair of one-way pawls 2'62 and 264 are providedfor preventing ratchets 228 and 252 from creeping backward in a counterclockwise direction.
  • Main counter wheel 232 is affixed to counter ratchet wheel 252 for rotation therewith, such that each advancement .of the counter ratchet moves ratchet tooth 234 closer to drive pawl 230.
  • ratchet tooth 234 falls within the stroke area of tripawl 230, enabling the drive pawl on the next stroke.
  • tensioning lever 266 including a slot 268 which receives an extension of shaft 246 carried by drive lever 248.
  • This mechanical arrangement is best illustrated in FIGS. wand 12.
  • the tensioning lever isprovided with a drive surface 270 which frictionally engages a corresponding surface 272 associated with take-up spool 226.
  • the opposite end of the take-up spool is mounted to a one-way bearing 274 which permits rotation of the take-upspool is a counterclockwise direction only.
  • tensioning lever 266 As tensioning lever 266 is reciprocated, take-up spool 226 is rotated in a counterclockwise direction until the web is snugly wound and held in tension between the take-up spool and controller rollers 222 and 224. Subsequent reciprocation of the tensioning lever is accompanied by slippage at frictional surfaces 270 and 272. This slippage also occurs when the tensioning lever is pivoted in a clockwise direction due to the one-way bearing 274.
  • the second embodiment of the advance mechanism further differs from the first embodiment in that-the imaging portion of the web is maintained in tension during exposure by a tensioning mechanism associated with the supply spool, rather than the take-up spool.
  • the supply spool indicated at 276, includes a notched disc 276 drivingly connected to a tensioning mechanism 280 by way of a connection pin 282.
  • a housing 284 carries pin 282 and is attached to the outer end of a coil spring 286.
  • a support shaft 290 rotatably supports one end of the take-up spool and is attached to the inner end of coil spring 286.
  • a bushing 288 rotatably supports housing 284 to shaft 290.
  • a friction clutch generally indicated bythe numeral 292, includes a stationary member 294 attached to the frame structures and plate 70.
  • A. moveable member 296 is keyed to shaft 290 and' frictionally engages stationary member 294 along the area indicated at 298.
  • supply spool 276 When the photoconductor is incrementally advanced,supply spool 276 is rotated in a counterclockwise direction, which in turn winds spring 286 by way of housing 284 and pin 282. If thespring is fully wound, shaft 290 is free to rotate through slip clutch 292.-After the incremental advance is completed, spring 286is left in a fully wound condition..When the support doors swing inward for the next exposure, the excess photoconductor is pulled in by clockwise rotation of take-up spool 276 under the influence of coil spring 286.
  • the second embodiment of the advance mechanism provides automatic incremental advance of the photoconductor web after a preselected number of copy cycles.
  • the number of copy cycles required before advancement may be conveniently selected.
  • the length of incremental advancement may be adjusted by way of cam 236. Cycling of the support door advances the counter mechanism and effects advancement of the photoconductor upon reaching the preselected count. It will also be appreciated that cycling of the support doors maintains the photoconductor snugly wound on the take-up spool by way of tensioning lever 266, while the imaging portion of the web is automatically held in tension by way of the tensioning mechanism associated with the supply spool.
  • a photoconductor-carrying assembly for use with an 'electrophotographic reproduction apparatus, said assembly comprising:
  • said movement means includes actuation means operatively connected to said support member foreffectingitspivotal inward movement to said folded position .in response to rotation of said frame structure to a first predetermined angular position.
  • said actuation means includes a stationary cam member mounted adjacent said frame structure and a cam follower carried by said support member operativelyengageable by said cam member.
  • said support surface is defined by a pair of normally mated pivotally mounted support members each operatively connected to said movement means for pivotal movement thereby between a normal position and a folded position.
  • a photoconductor-carrying assembly for use with an electrophotographic reproduction apparatus, said assembly comprising: i
  • a frame structure including a support member defining a normally curved support surface
  • a flexible photoconductor element comprising a web
  • take-up means associated with said frame structure for advancing said web and storing a used portion thereof, said intermediate portion being between said supply portion and saidused portion of photoconductor web and defining at least one image area,-and
  • said tensioning means including means for preventing slack in said photoconductor web between said first and second points when the configuration of the intermediate portion of the web is changedfrom curved to substantially planar by said disengagement means.
  • take-up means is actuated in response .to completion of a predetermined number of operations of said cyclic disengagement means.
  • take-up means include means for effectively counting the number of cyclesof said disengagement means to effect said selective advancement of said web upon reaching a predetermined count.
  • said take-up means includes a take-up roller in operative engagement with said web, a main drive ratchet drivingly connected to said take-up roller and a drive pawl operatively connected to said support member for movement thereby, said counting means preventing driving engagement of said drive pawl with said drive ratchet until said predetermined count is reached.
  • a stationary housing a frame structure rotatably mounted to said housing, said frame structure including a support surface,
  • advance means operatively connected to said photoconductor element for advancing said photoconductor element over said support surface toward said take-up location from said supply location, said advance means including a rotatable drive element carried by said frame structure, said drive element moving in a circular path about said axis of rotation when said frame structure is rotated by said motive means, and 1 actuation means associated with said stationary housing and selectively movable between a normal retracted position and an advance position, said actuation means when in said advanceposition operatively engaging said drive element to effect rotation thereof to operate said advance means.
  • said actuation means includes a generally arcuate actuation member supported by said stationaryhousing, said actuation member intersecting said circular path when in said advanced position toengage drive element and effect rotation thereof due to rotation of said frame structure.
  • actuation means includes electromechanical means responsive to a photoconductor advance signal to move said actuation member to said advance position.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
US00421258A 1973-12-03 1973-12-03 Photoconductor-carrying drum assembly Expired - Lifetime US3826570A (en)

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US3974974A (en) * 1973-05-15 1976-08-17 Ricoh Co., Ltd. Back tension imparting device
US4003651A (en) * 1974-01-28 1977-01-18 Konishiroku Photo Industry Co., Ltd. System for recording images received by facsimile
US4063809A (en) * 1975-01-27 1977-12-20 Pitney-Bowes, Inc. Photoconductor support drum for photocopy machine
US4068942A (en) * 1975-10-14 1978-01-17 Xerox Corporation Advanced photoreceptor
US4097138A (en) * 1976-08-27 1978-06-27 Xerox Corporation Photoconductive belt incrementing apparatus
US4167321A (en) * 1976-09-14 1979-09-11 Olympus Optical Co., Ltd. Photosensitive drum for electrographic apparatus
US4490033A (en) * 1983-04-28 1984-12-25 Xerox Corporation Reproducing apparatus with scrolled imaging web
US4585326A (en) * 1983-04-14 1986-04-29 Konishiroku Photo Industry Co., Ltd. Developing electrophotographic image using magnets and magnetic material
US5355795A (en) * 1993-08-26 1994-10-18 Presstek, Inc. Automatic plate-loading cylinder for use with plate-imaging systems
US5422706A (en) * 1990-10-23 1995-06-06 Kabushiki Kaisha Toshiba Photoconductor for xerography
US5657692A (en) * 1995-05-04 1997-08-19 Presstek, Inc. Removable supply and uptake assemblies for lithographic plate material
US5708923A (en) * 1995-07-30 1998-01-13 Minnesota Mining And Manufacturing Company Photoreceptive sheet cartridge and method of using the same
US5813329A (en) * 1992-12-29 1998-09-29 Ricoh Company, Ltd. Printer for wrapping stencil around drum
USRE36275E (en) * 1992-07-23 1999-08-24 Heidelberger Druckmaschinen Ag Plate cylinder for a printing press having plate material in a cartridge within the plate cylinder

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IT1047394B (it) * 1975-10-09 1980-09-10 Olivetti & Co Spa Macchina copiatrice

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Cited By (14)

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US4167321A (en) * 1976-09-14 1979-09-11 Olympus Optical Co., Ltd. Photosensitive drum for electrographic apparatus
US4585326A (en) * 1983-04-14 1986-04-29 Konishiroku Photo Industry Co., Ltd. Developing electrophotographic image using magnets and magnetic material
US4490033A (en) * 1983-04-28 1984-12-25 Xerox Corporation Reproducing apparatus with scrolled imaging web
US5422706A (en) * 1990-10-23 1995-06-06 Kabushiki Kaisha Toshiba Photoconductor for xerography
USRE36275E (en) * 1992-07-23 1999-08-24 Heidelberger Druckmaschinen Ag Plate cylinder for a printing press having plate material in a cartridge within the plate cylinder
US5813329A (en) * 1992-12-29 1998-09-29 Ricoh Company, Ltd. Printer for wrapping stencil around drum
US5355795A (en) * 1993-08-26 1994-10-18 Presstek, Inc. Automatic plate-loading cylinder for use with plate-imaging systems
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US5708923A (en) * 1995-07-30 1998-01-13 Minnesota Mining And Manufacturing Company Photoreceptive sheet cartridge and method of using the same

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Publication number Publication date
JPS5090339A (enrdf_load_stackoverflow) 1975-07-19

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