US3272100A - Electrostatic copier - Google Patents

Electrostatic copier Download PDF

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Publication number
US3272100A
US3272100A US320159A US32015963A US3272100A US 3272100 A US3272100 A US 3272100A US 320159 A US320159 A US 320159A US 32015963 A US32015963 A US 32015963A US 3272100 A US3272100 A US 3272100A
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United States
Prior art keywords
original
sheet
window
image
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
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US320159A
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English (en)
Inventor
Marvin W Teutsch
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.)
Nucor Corp
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Nuclear Corp of America
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Filing date
Publication date
Application filed by Nuclear Corp of America filed Critical Nuclear Corp of America
Priority to US320159A priority Critical patent/US3272100A/en
Priority to SE11914/64A priority patent/SE314901B/xx
Priority to FR992416A priority patent/FR1415044A/fr
Priority to DE19641497017 priority patent/DE1497017B2/de
Priority to ES0305375A priority patent/ES305375A1/es
Priority to BE654883D priority patent/BE654883A/xx
Priority to GB43836/64A priority patent/GB1060098A/en
Priority to CH1410264A priority patent/CH430455A/de
Priority to NL6412672A priority patent/NL6412672A/xx
Priority to US529165A priority patent/US3389635A/en
Application granted granted Critical
Publication of US3272100A publication Critical patent/US3272100A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/28—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 projection is obtained by line scanning
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • My invention relates to an electrostatic copier and more particularly to an improved electrostatic copier provided with improved means for exposing copy paper to an image and with means for carrying the exposed paper to the developing system without danger of crumpling the paper of jamming 4the machine.
  • One type of c-opy machine is the electrostatic copier in which a sheet of copy paper provided with a photoconductive coating receives an electrostatic charge and then is exposed to an image of the original to produce a latent electrostatic image on the paper. After it has received the latent electrostatic image, the copy paper is carried through a developing system in which it is subjected to the action of a toner so that particles of material adhere to the paper in areas to produce a visual image. This image is then set and the copy has been made.
  • a window of transparent material is employed to support the copy paper in the course of its travel as it is exposed to the image.
  • a window formed, for example, from a glass plate tends to collect dust, paper lint and possibly stray particles of toner. After a period of time, the window becomes dirty and causes spots and streaks in the copy. This necessitates frequent -cleaning of the glass Window if clear copies are to be produced.
  • the copy paper After the copy paper has received the latent electrostatic image, it must be carried to the developing system ywherein it receives particles of toner to develop the image.
  • the path of travel of the paper from the exposure window to the developing system is tortuous.
  • the static charge which was placed on the paper causes the paper to adhere to almost any other surface it touches. In machines of the prior art this fact has caused great diliculty in that the charged paper has a tendency to become crumpled and to jam.
  • My machine has an open window provided with means tor supporting the copy paper at it travels past the window in the course of ⁇ its exposure to an image of the original.
  • My machine includes means for supporting the charged paper throughout its extent as it moves from the exposure window to the developing system to avoid crumplng of the paper or jamming of the machine.
  • I provide my electrostatic copier with means for -making any number of copies within a given maximum automatically in a rapid and expeditious manner.
  • One object of my invention is to provide an electrostatic copier with an exposure window which will not accumulate dirt.
  • Another object of my invention is to provide an electrostatic copier having means for supporting the charged sheet throughout its extent as it moves to the developer vsystem t prevent crumpling the paper ⁇ or jamming the machine.
  • a further object lof my invention is to provide an electrostatic copier for selectively and :automatically making a predetermined number of copies of the single original.
  • a still further object of my invention is to provide an electrostatic copier for selectively and automatically making a desired number of copies of a single original.
  • Yet another object of my invention is to provide an electrostatic copier with means for counting the number of copies made to stop the copying cycle of the machine automatically when the preselected number is reached.
  • my invention contemplates the provision of an electrostatic copier comprising an open exposure window having means for supporting a sheet of copy paper as it is exposed to an image of the original.
  • I provide a double belt transport system which supports the paper over its entire area and carries it to the developer system without danger of crumpling or jamming the machine.
  • My machine is provided wth a mechanism for auto-matically making a preselected number of copies of a single original and for stopping the machine when the number is rea-ched.
  • FIGURE 1 is a perspective vie-w of my electrostatic copier.
  • FIGURE 2 is a sectional view of my electrostatic copier illustrating the relationship between the various parts of the machine.
  • FIGURE 3 is a top plan of my electrostatic copier.
  • FIGURE 4 is a perspective View of the open transport window of my electrostatic copier.
  • FIGURE 5 is a fragmentary sectional view illustrating the copy paper transport system of my electrostatic copier.
  • FIGURE 6 is a fragmentary sectional View illustrating the Aoriginal transport system of my electrostatic copier.
  • FIGURE 7 is a fragmentary plan view of the original transport system taken along the line 7--7 of FIGURE 6.
  • FIGURE 8 is a schematic view of the copy paper transport system driving arrangement.
  • FIGURE 9 is a schematic View of the original paper transport system driving arrangement.
  • FIGURE l0 is a schematic view of one form of controli circuit which I may employ for my electrostatic copler.
  • my electrostatic copy machine indicated generally by the reference character 10 comprises a bottom housing half 12 to which I secure a baseplate 14 by any suitable means, such as by screws 16.
  • the front of the bottom halt 14 has a slot 18 adjacent the bottom thereof through which an original return tray 20 ⁇ extends.
  • the top half 22 of the housing has -a large central opening 24 over a portion of which a window 26 extends.
  • a copy delivery tray 2-8 is positioned to provide access to copies made on my machine.
  • the top half 22 has respective openings adjacent the large opening 24 through which there extend a dial selector 30 and push button 32 for operation of the machine.
  • baseplate 14 carries a pair of spaced main frame plates 34 and 36 which support the operating mechanism of the machine.
  • Any suitable means such as brackets 38, carried by side panels 34 and 36, support a copy paper supply tray 40 between the plates.
  • the leading edge 42 of the tray 40 is inclined so as to guide the sheets 44 of copy paper into the nip between a pair of copy paper feed rolls 46 and 48 rotatably supported in the side plates 34 and 36.
  • the rool 48 loosely carries a pair of arms 50 adjacent the ends thereof swingably to support a roll 52 adapted to be driven to initiate movement of the top sheet 44 into the nip between the rolls 46 and 48.
  • a pair of spaced rubber drive belts 54 pass through the nip between the rolls 46 and 48 and around roll S2 to drive roll 52 in a manner to be described.
  • roll 46 is driven in the direction of the arrow shown in FIGURE 5. This action causes the rOll 48 to be driven and belts 54 drive roll 52 to slide the uppermost sheetl 44 up into the nip between rolls 46 and 48.
  • a bracket 56 carries a microswitch 58 having a feeler 60 which extends into the path of a sheet of copy paper being fed by the rolls 46 and 48.
  • the drive to roll 46 is interrupted and the machine is ready for a copying operation in response to insertion of the original into the machine.
  • the drive to roll 46 is rfb-established and the sheet of copy paper is fed between guides 62 and 64 which lead into the charging wand chamber 66.
  • a pair of spaced wires 68 extend across the upper half of the chamber 66 while spaced wires 70 extend across the lower .half of the charnber 66.
  • a potential of, for example, +4000 volts D.C. is applied to the wires of the upper pair and a potential of 6000 volts D.C. is applied to the wires of the lower pair.
  • the path of a sheet of copy paper passing through the ch-amber is located so that it is 40 percent of the total distance between wires 68 and 70 from the wires 68 and consequently 60 percent of the total distance between wires 68 and 70 above the wires 70.
  • the sheets 44 are coated with a photoconductive material of a suitable type known to the art, such as zinc oxide. They are stacked in the tray 40, coated side down. When in a manner described they have passed through the chamber 66, they carry an electrostatic charge. As a sheet leaves the chamber it passes into the nip between a transport ⁇ belt 72 and an idler roller 74. The belt 72 passes -around a roller 76 and respective driven rollers 78 and 80. A pair of spaced plates 82 carried by the main frame support the sub-assembly of the belt transport system. After leaving the nip between the roller 74 and the belt 76, the sheet moves onto an open exposure window indicated generally by the reference character 84 comprising a generally rectangular frame 86.
  • a photoconductive material of a suitable type known to the art, such as zinc oxide.
  • the longer sides of frame 86 carry anges 88 and 90 having notches 92 in which I thread a fine filament 94 so as to form divergent strands of the filament extending generally outwardly from the center line of the path of movement of the paper. Owing to this divergent str-and arrangement, there is no danger that the paper might be caught in the lilament.
  • Filament 94 maybe made of any suitable material. Preferably I employ monolilament nylon.
  • Adjusting mechanisms mount a tension roller 98 on the plates 82 to lpermit adjustment of the tension in the belt 72.
  • Plates 82 carry another pair of rollers 100 and 102 which are driven from rollers 80 and 78 in a manner to be described.
  • Rollers 100 and 102 support a secondary transport belt 104, a portion of which registers with a length of the belt 72.
  • a sheet of copy paper leaving the window 84 moves into the nip between belts 72 and 104 and is securely guided upwardly and around roller 78 as viewed in FIGURE 5 and into the toner system indicated generally by the reference character 106 of my machine.
  • Any suitable insulating material may be used to form the belts 72 and 104.
  • I employ a material such as Mylar which is the registered trade mark of E. I. du Pont de Nemours and Co. for a highly durable, transparent water repellent film of polyethylene terephthalate resin. It has outstanding strength, electrical propertiesand chemical inertness.
  • the double belt transport system of my copy machine has a distinct advantage over paper-guiding systems of the prior art. It is well known in the art that the electrostatic charge placed on the paper as it passes through the chamber 66 causes the paper to adhere to almost any surface. Owing to this fact in the prior art the paper has become crumpled and jammed in the course of its travel from the window 84 to the developing system 106. The cooperation of the belt 72 and the ybelt 104 ensures against such an occurrence as the paper is carried from the window 84 to the developer system 106. While the belt 72 is under tension, the belt 104 is a loose-fitting belt which requires no tensioning device and no centering device other than the side plates 82. Rollers 100 and 102 are driven from their mating rollers and 78 in a manner to be described so that belt 104 is not required to transmit power andconsequently has no slippage. It moves at the same speed as does the belt 72.
  • the developer system indicated generally by the reference character 106 includes a tank 108 which is cast from any suitable material and supported on the machine frame.
  • the base of tank 108 is provided with ribs 110 which guide a sheet of copy paper passing into the tank.
  • a sheet of copy paper carrying a latent image of the original passes out from between belts 72 and 104 and down into the tank 108.
  • a suitable liquid toner carrying particles adapted to be picked up by the charged portions of the paper is pumped into the tank 108. Since this system per se forms no part of my invention, it will not be described in detail herein. Excess toner in the tank 108 ows over a weir 112 and back to the reservoir (not shown).
  • the developing system of my machine comprises a pair of hold-down rolls 114 and 116 supported in slots 117 in the sides of the tank 108. These rolls are slightly spaced -apart so that they do not squeeze the paper. They function to keep the copy bel-ow the level of the toner after the paper has been released from the belts 72 and 104.
  • the rolls 114 and 116 are driven through gearing from the main drive of the machine.
  • the wet deleveloped sheet of copy paper is fed by rolls 114 and 116 to a pair of squeeze rolls 118 and 120.
  • rolls 114, 116 and 118 are rubber covered.
  • Squeeze roll 120 which is formed of steel, is kcontinuously wiped by a wiper 122 carried by a guide 124 supported on the machine frame.
  • the squeezed developed copy paper is fed by squeeze rolls 118 and 120 to rubber transport belts 126 carried by rollers 128 and 130 comprising a part of the fixing system indicated generally by the reference character 132 of my machine. Since the fixing system per se does not form a part of my invention, it will not be described in detail herein.
  • the fixing system is described more particularly in the copending application of Adalbert R. Vil, Serial No. 320,862, filed November 1, 1963, for Fixing System for Copy Machine.
  • the transport belt system 126 carries the damp developed copy paper through the space between an upper duct 134 and a lower duct 136, the sides of which adjacent the belt system are perforated. These ducts blow heated air onto the surface of the paper to dry the same. Following the drying operation, thepaper moves out onto the delivery tray 28 on which itis accessible to the operator of the machine.
  • a guide 138 on the underside of the tray 28 and a rearward extension 140 of the top 22 of the machine case form a slot 142 leading into the original-handling mechanism indicated generally by the reference character 144 of my machine.
  • a sheet of original to be copied is guided by slot 142 to the nip between a pair of input feed rollers 146 and 148 supported. between a pair of frame plates 150 of the unit 144.
  • Feed rolls 146 and 148 advance the sheet to the space between guide plates 151 and 152 until the leading edge of the sheet strikes the feeler 154 of a microswitch 156.
  • actuation of the feeler 154 initiates a copying operation.
  • the sheet is advanced to the nip ybetween a control roller 158 and a belt 160 supported. on rolls 162, 1-64 and 166.
  • the belt 160 carries the sheet around past a guide 168 which leads the sheet past a window 170 through which light is focused on the original in a manner to be described.
  • the original passes between a retainer roller 172 and the belt 160 and is advanced along a guide 174 toward output feed. rolls 176 and 178.
  • the original transport mechanism 144 of my machine includes a gate 180 carried by a shaft 182 for movement therewith.
  • the gate 180 is adapted to be moved between the full line and broken line positions illustrated in FIGURE 6. Assuming the gate to be in the full line position shown in the figure, the leading edge of the original is guided by the gate to the nip between rolls 176 and 178 so that these rolls carry the sheet down onto 4the return tray 20.
  • the gate 180 is moved to the broken line position. When this is done, the leading edge of the sheet, rather than being directed ⁇ to the nip between rolls 176 and 178, is directed to the space between guides 184 and 186 which lead the sheet back into the input feed rolls 146 and 148 so that the sheet recirculates 4through the original transport system.
  • the multiple copy select knob 30 is carried by a shaft 188 supported in frame members 190 and 192 disposed outboard of the right-hand plate 150 as viewed from the front of the machine.
  • Shaft 188 carries for movement therewith a copy numberdetermining cam 194 provided with a flat 196.
  • a follower 198 is adjustably mounted on an arm 200 pivotally carried on a pin 201. Nuts 204 permit adjustment of the follower.
  • the other end of arm 200 receives a link 202.
  • a pin 206 connects link 202 to a lever 208 mounted on shaft 182 for movement therewith by any suitable means, such as a setscrew 210.
  • a spring 212 bears between the plate 150 and the arm 208 normally to urge follower 198 into engagement with the periphery of the cam 194.
  • a lug 214 on link 202 normally engages the movable element 216 .of a switch 218 to hold the switch open.
  • knob 30 When it is desired to make repeat copies, knob 30 is rotated through a distance corresponding to the maximum number of possible copies less the desired number. As soon ⁇ as follower 198 is thus moved out .of engagement with the fiat 196, the gate 180 is moved to the broken line position. This action also permits switch 218 to close.
  • a uni-directional clutch 220 couples shaft 188 to an arm 222 connected by a pin 224 to the armature 226 of a ⁇ solenoid 228.
  • a pulse of current is fed to solenoid 228 to step shaft 188 through a step of movement. This action continues until the follower 198 again engages the flat 196. When this occurs, the pulsing circuit is disabled and gate 180 returns to the position at which the original is delivered back to the operator on the return tray 20.
  • housing 244 supports a lens 246 and a reective surface 248 which reflects the image coming through opening 242 to a mirror 250.
  • Mirror 250 directs the image onto a reflecting surface 252 which translates the image upwardly through an opening 254 and onto the copy paper through window 84.
  • the charge which paper 44 received in passing through the corona leaks off in the relatively lighter areas of the image.
  • the charged paper is caused to carry a latent electrostatic image of the original.
  • the drive motor 256 supported on the base 14 is adapted to be energized to drive a shaft 258 carrying a sprocket wheel 260.
  • Wheel 260 drives a pitch chain 262 in engagement with a sprocket wheel 264.
  • Chain 262 also extends around an idler sprocket wheel 266, a sprocket wheel 268 and a sprocket wheel 270. All of the wheels 260, 264, 266, 268 and 270 are rotatably supported on side panel 36 and are disposed outboard thereof.
  • the shaft 272 carrying sprocket Wheel 264 extends through the panel 36 and carries a gear 274 inboard of the panel. Gear 274 is in driving engagement with respective gears 276 and 278 carried by rolls 78 and 80 for movement therewith. Pinions 280 and 282 on the rollers 102 ⁇ and 100 drive the rollers in synchronism with their associated rol-ls.
  • Shaft 284 which carries pinion 268 extends through the wall 36 and carries a pinion 286 for movement therewith. Pinion 286 engages and drives gears 288 and 290 carried respectively by the outlet squeeze roller 118 and by the roller 128 of the belt transport of the fixing system 132.
  • a train of gears, 292, 294 and 296, translate the movement of gear 288 to a gear 298 carried by the lower feed roll 116 of the developer tank rolls.
  • a gear 300 on the upper developer tank feed roll 114 is coupled to the gear 298.
  • the shaft 302 which supports wheel 270 extends through wall 36 and carries a gear 304 in driving engagement with a gear 306 carried by the input shaft 308 of a clutch 310 adapted to be energized to connect shaft 308 to roll 46 which drives the copy paper supply feed.
  • Chain 262 extends from sprocket wheel 270 and from sprocket wheel 266 ⁇ around a sprocket wheel 312 carried by ⁇ a shaft 314 on the side panel 36.
  • Shaft 314 extends through the panel and carries for rotation therewith a gear 316 in engagement with a gear 318 supported on a shaft 320 in panel 36.
  • Gear 318 is in driving engagement with a gear 322 on roll 162 and with a gear 324 on roller 148.
  • a pinion 326 on roller 158 is driven by gear 322.
  • a pinion 328 on roller 146 is driven by gear 324.
  • a gear 330 on the end of roll 164 remote from panel 36 drives a pinion 332 on roller 172.
  • a gear 334 on the end of roll 166 remote from wall 36 drives a pinion 336 on the upper original output feed roller 176.
  • a pinion 338 in engagement with pinion 336 drives the lower output feed roller 178.
  • FIGURES 8 and 9 the arrows alongside chain 262 and the arrows adjacent the various gears and shafts indicate the directions of movement for proper feeding action.
  • One line 340 of the control circuit is connected to a first terminal 342 of a source including a second terminal 344 by a power switch PS and a fuse 346.
  • the other control circuit conductor 348 is connected directly to the terminal 344.
  • I connect the main drive motor 350, two blower motors 352 and 354 and pump motor 356 across lines 340 and 348 so that all motors are energized when switch PS is closed.
  • I also connect a toner supply sensing switch 358, a signal light 360 and a current-limiting resistor 362 in series across the lines.
  • a paper supply sensing switch 364, a signal lamp 366 and a current-limiting resistor 368 also -are connected across the line.
  • An air-heating element 370 and a normally closed thermal-responsive switch 372 are in series across the line.
  • the iirst control relay 1R of -my system has switches 1R1, 1R2 and 1R3 associated therewith. These switches normally occupy the positions shown in FIGURE l0.
  • a linkage 374 moves all the switches to the other position.
  • a first rectier circuit comprising a fuse 376, a rectifier 378, a resistor 380, switch 1R, a resistor 382 and a capacitor 384 all connected in series between the lines provide solenoid pulses in a manner to be described. I connect the winding S of solenoid 228 in series with switch 218 between the normally disengaged contact of switch 1R and line 348.
  • a second rectifier circuit comprising a fuse 388, rectier 390, resistor 392 and capacitor 394 is connected across the lines 340 and 348 to provide a ⁇ direct current potential at point 396 for the operation of the relays.
  • I connect the microswitch 58 indicated as MSl in FIGURE l() between point 396 and one terminal of the Winding C of clutch 310, the other terminal of which is connected to line 348.
  • 1R2 is connected across MSl to bypass this switch when winding 1R is energized.
  • a thermal switch 398, a signal lamp L, a resistor 400 and the normally engaged contact of switch 1R3 are connected across the lines in the position of the parts shown in FIGURE l0.
  • I connect the other or disengaged contact of 1R3 to one terminal of winding 2R, the other terminal of which is connected to the switch 398 by the timer switch T.
  • I connect the normally disengaged terminal of microswitch 156, indicated as MS2 in FIGURE 10, to winding 1R so that when the original moves MS2 to the position other than that shown in FIGURE 10, winding 1R will be energized.
  • Switch 2R1 when connected in response to energization of winding 2R completes the circuit for the lamp 236.
  • Switch 2R2 completes the circuit of the timer motor TM when Winding 2R is energized and after microswitch MS2 is permitted to return to its initial position as the trailing edge of the original passes the switch.
  • Switch 2R3 provides a holding circuit for Winding 2R through switch T after winding 1R drops out. This switch also completes the circuit for the charging wand energizing circuit, indicated generally by the reference character 402.
  • I rst close power switch PS for example, in response to the operation of a push button 32. If only a single copy is to be made, knob 30 is positioned at a location corresponding to a single copy.
  • PS closes the main drive motor 350, blower motors 352 and 354 and pump motor 356 all are energized.
  • signal light 360 is lit to indicate that the machine is low on toner.
  • Lamp 366 lights to indicate the depletion of the supply of paper and the air heater 370 is energized.
  • Closing of switch PS also energizes the Winding C of clutch 310 from rectifier terminal 396, through MSI and through winding C to line 348.
  • roller 46 to driven to drive roller 48, belts 54 and -roller 52 to slide the top sheet 44 of copy paper from tray 40 to the nip between rollers 46 and 48.
  • the paper moves between guides 52 and 54 and actuates the element 60 of microswitch 56.
  • Mieroswitch58 indicated as MS1 S in FIGURE 10 ope-ns and clutch 210 is de-energized. The machine is now ready to make a copy.
  • switch 1R1 When switch 1R1 is actuated, it normally applies a pulse from capacitor C1 through switch 218110 winding S of solenoid 228. Owing to the fact that only a single copy is being made however, switch 218 is open so that the pulse never reaches solenoid S. Closing of the switch 1R2 re-establishes the circuit to the clutch winding C since it bypasses MSI. At the same time, switch 1R3 closes to disable the ready lamp L and to energize winding 2R through the timer switch T. Moreover, it energizes the corona discharge voltage supply system 402.
  • Switch 2R1 lights the lamp 236.
  • Switch 2R2 readies the timer motor TM, the circuit of which is completed when MS2 returns to its initial position in a manner to be described.
  • Switch 2R3 provides a holding circuit for the corona discharge supply and for winding 2R.
  • the original and the sheet of copy paper 44 move in synchronism respectively through the original transport system 144 and through the copy paper transport system.
  • the copy paper passes through the housing 66, it receives an electrostatic charge.
  • the copy paper and the original move in synchronism past windows 84 and 170.
  • a reflected image of the original is transported to the copy paper to cause the charge to leak off over the exposed areas.
  • the copy paper carries a latent image of the original.
  • the copy paper then is transported between belts 104 and 72 to the developer system 106.
  • the double belt arrangement supports the copy paper over its entire extent in the course of this movement to prevent any cr-umpling or jamming.
  • the copy paper After leaving the belt system the copy paper moves down into tank 108 and through the liquid therein so that particles of toner are picked up by the charged areas on the paper.
  • the damp copy passes through the fixing system 132 and down onto the tray 28. After passing between window 170, the original moves along guide 174 toward roller 176. It will be remembered that only one copy is being made so that gate is in the full line position shown in FIGURE 6. In this position of the gate, it guides the leading edge of the original to the nip between rollers 176 and 178 which feed the original to the return tray 20.
  • knob 30 is set to the desired number of copies. This positions cam 194 at a predetermined location. It permits switch 218 to close. Now, on each Icopy operation,
  • a pulse is applied to the winding S of solenoid 228 to step cam 194 through a step of movement.
  • follower 198 falls back onto the flat 196 so that switch 218 is open and the machine will recycle.
  • a copying machine for producing copies of an original on photoconductive copy sheets including in combination means for applying an electrostatic charge to a sheet, an open exposure window through which a charged sheet is exposed to an image of the original to produce a latent electrostatic image of the original, a plurality of filament strands extending across said window for supporting a sheet, a developing station at which the exposed sheet is subjected to the action of toner to develop said latent image, said developing station having an entrance, respective conveyors having contiguous lengths thereof extending from adjacent said window to the entrance of said developing station, means comprising said contiguous conveyor lengths for carrying charged sheets successively past said charging means and said Window and said developing station, an original exposure window, an original transport system for carrying an original past said original exposure window, means for transferring an image of an original passing said exposure window to a photoconductive copy sheet passing by said open exposure window, means responsive to entry of an original into said original transport system for activating said copy carrying means, means adapted to be actuated to reeirculate said original through said original transport
  • an electrostatic copying machine having an exposure station at which a charged photoconductive sheet is exposed to an image of the original to produce a latent electrostatic image of the original and having a developing station at which the sheet carrying the image is subjected to the action of toner to develop the image, said developing station having an entrance, a transport system for carrying the sheet from the exposure station to the developing station including a first belt, a second belt, means mounting said belts with portions of the lengths thereof in closely spaced relationship, said closely spaced belt lengths extending from said exposure station to the entrance of said developing station, said belts having a nip therebetween and means for driving one of said belts to .carry said sheet fed to said nip between said belt lengths to feed said sheet from said exposure station to said developing station.
  • an exposure window through whi-ch a charged photoconductive sheet is exposed to an image of .an original to produce a latent electrostatic image of said original, developing means for subjecting said exposed sheet to the action of toner, means mounting said window and said developing means at vertically spaced levels, a first conveyor belt, a second conveyor belt, means mounting said belts with contiguous generally vertically disposed lengths thereof extending from one of said levels adjacent said window to the other level adjacent said developing means, means for driving one of said belts and means comprising said belt lengths for carrying said exposed sheet from said exposure window to said developing system.
  • an exposure window at which a charged photoconductive sheet is exposed to an image of the original to produce a latent electrostatic image of said original
  • developing means for subjecting said exposed sheet to the action of toner
  • an exposure station at which a charged photoconductive sheet is exposed to an image of an original to produce a latent electrostatic image of said original, developing means for subjecting said exposed sheet to the action of toner, said developing means comprising a trough having an entrance, respective contiguous conveyor lengths extending from adjacent said exposure station to said trough entrance of said developing means, said conveyor lengths being adapted to receive said sheet therebetween and means comprising said conveyor lengths for carrying said sheet from said exposure station to said developing means.
  • an electrostatic copying machine having a station at which a charged photoconductive sheet is exposed to an image of an original, an open frame forming a window at said station through which said image is focused on said sheet traveling past said station, said frame having peripheral flanges provided with notches and lilamentary strands disposed in said notches and extending across said window to support a sheet traveling past said window.
  • an electrostatic copying machine having a station at which a charged photoconductive sheet traveling along a path is exposed to an image of an original, an open frame forming a window at said station through which said image is focused on said sheet traveling past said station, said frame having flanges extending along its edges generally perpendicular to said path, notches in said anges and divergent lamentary strands disposed in said notches, said strands diverging in the direction of travel of said sheet along said path.
  • an exposure win- ,dow at which a charged photoconductive sheet is exposed to an image of the original to produce a latent electrostatic image of the original
  • developing means for subjecing said exposed sheet to the action of toner
  • means mounting said exposure window and said developing means at vertically spaced levels
  • a first conveyor belt having a width of the order of the width of said sheet
  • a second conveyor belt having a width of the order of the width of said sheet

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Paper Feeding For Electrophotography (AREA)
US320159A 1963-10-30 1963-10-30 Electrostatic copier Expired - Lifetime US3272100A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US320159A US3272100A (en) 1963-10-30 1963-10-30 Electrostatic copier
SE11914/64A SE314901B (es) 1963-10-30 1964-10-02
FR992416A FR1415044A (fr) 1963-10-30 1964-10-23 Machine électrostatique à copier
DE19641497017 DE1497017B2 (de) 1963-10-30 1964-10-26 Elektrophotographisches kopiergeraet
ES0305375A ES305375A1 (es) 1963-10-30 1964-10-27 Maquina copiadora electrostatica.
BE654883D BE654883A (es) 1963-10-30 1964-10-27
GB43836/64A GB1060098A (en) 1963-10-30 1964-10-27 Electrostatic copier
CH1410264A CH430455A (de) 1963-10-30 1964-10-30 Elektrostatische Kopiermaschine
NL6412672A NL6412672A (es) 1963-10-30 1964-10-30
US529165A US3389635A (en) 1963-10-30 1965-12-03 Electrostatic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US320159A US3272100A (en) 1963-10-30 1963-10-30 Electrostatic copier

Publications (1)

Publication Number Publication Date
US3272100A true US3272100A (en) 1966-09-13

Family

ID=23245138

Family Applications (1)

Application Number Title Priority Date Filing Date
US320159A Expired - Lifetime US3272100A (en) 1963-10-30 1963-10-30 Electrostatic copier

Country Status (9)

Country Link
US (1) US3272100A (es)
BE (1) BE654883A (es)
CH (1) CH430455A (es)
DE (1) DE1497017B2 (es)
ES (1) ES305375A1 (es)
FR (1) FR1415044A (es)
GB (1) GB1060098A (es)
NL (1) NL6412672A (es)
SE (1) SE314901B (es)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345926A (en) * 1964-11-12 1967-10-10 Formfoto Mfg Company Electrophotographic copying machine
US3424529A (en) * 1965-10-23 1969-01-28 Formfoto Mfg Co Paper guide for electrophotographic copying machines and the like
US3482912A (en) * 1967-05-17 1969-12-09 Scm Corp Duplicating mechanism
US3490843A (en) * 1964-06-30 1970-01-20 Savin Business Machines Corp Electrostatic copier
US3498708A (en) * 1965-09-09 1970-03-03 Inmont Corp Photocopying apparatus
US3620619A (en) * 1969-07-08 1971-11-16 Minolta Camera Kk Exposure window system for electrostatic copier
US3623806A (en) * 1969-10-20 1971-11-30 Minnesota Mining & Mfg Original document feeder with registering gate and movable platen
US3687540A (en) * 1967-12-27 1972-08-29 Ricoh Kk Form feeding device with memory means
US3690759A (en) * 1966-04-18 1972-09-12 Minolta Camera Kk Electronic photocopying machine
JPS4952537U (es) * 1972-08-10 1974-05-09

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770345A (en) * 1969-03-21 1973-11-06 Canon Kk Electrophotographic copying apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741960A (en) * 1954-12-29 1956-04-17 Ibm Record controlled printer
US3002434A (en) * 1958-06-19 1961-10-03 Rca Corp Film viewer and reproducer
US3005389A (en) * 1956-03-28 1961-10-24 Limberger Walter Electrophotographic copying device
US3052155A (en) * 1958-09-11 1962-09-04 Bruning Charles Co Inc Apparatus for exposing light sensitive sheets and/or webs
US3088386A (en) * 1959-11-16 1963-05-07 American Photocopy Equip Co Electrophotographic photocopy machine
US3101034A (en) * 1959-09-23 1963-08-20 Lumoprint Zindler Kg Apparatus for printing an original on to a copying paper
US3102449A (en) * 1960-06-22 1963-09-03 Xerox Corp Xerographic microfilm enlarger

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741960A (en) * 1954-12-29 1956-04-17 Ibm Record controlled printer
US3005389A (en) * 1956-03-28 1961-10-24 Limberger Walter Electrophotographic copying device
US3002434A (en) * 1958-06-19 1961-10-03 Rca Corp Film viewer and reproducer
US3052155A (en) * 1958-09-11 1962-09-04 Bruning Charles Co Inc Apparatus for exposing light sensitive sheets and/or webs
US3101034A (en) * 1959-09-23 1963-08-20 Lumoprint Zindler Kg Apparatus for printing an original on to a copying paper
US3088386A (en) * 1959-11-16 1963-05-07 American Photocopy Equip Co Electrophotographic photocopy machine
US3102449A (en) * 1960-06-22 1963-09-03 Xerox Corp Xerographic microfilm enlarger

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490843A (en) * 1964-06-30 1970-01-20 Savin Business Machines Corp Electrostatic copier
US3345926A (en) * 1964-11-12 1967-10-10 Formfoto Mfg Company Electrophotographic copying machine
US3498708A (en) * 1965-09-09 1970-03-03 Inmont Corp Photocopying apparatus
US3424529A (en) * 1965-10-23 1969-01-28 Formfoto Mfg Co Paper guide for electrophotographic copying machines and the like
US3690759A (en) * 1966-04-18 1972-09-12 Minolta Camera Kk Electronic photocopying machine
US3482912A (en) * 1967-05-17 1969-12-09 Scm Corp Duplicating mechanism
US3687540A (en) * 1967-12-27 1972-08-29 Ricoh Kk Form feeding device with memory means
US3620619A (en) * 1969-07-08 1971-11-16 Minolta Camera Kk Exposure window system for electrostatic copier
US3623806A (en) * 1969-10-20 1971-11-30 Minnesota Mining & Mfg Original document feeder with registering gate and movable platen
JPS4952537U (es) * 1972-08-10 1974-05-09
JPS5243307Y2 (es) * 1972-08-10 1977-10-01

Also Published As

Publication number Publication date
GB1060098A (en) 1967-02-22
ES305375A1 (es) 1965-02-01
BE654883A (es) 1965-02-15
FR1415044A (fr) 1965-10-22
NL6412672A (es) 1965-05-03
DE1497017A1 (de) 1969-10-30
DE1497017B2 (de) 1971-11-04
SE314901B (es) 1969-09-15
CH430455A (de) 1967-02-15

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