US3790271A - Processing control system for printing machines - Google Patents

Processing control system for printing machines Download PDF

Info

Publication number
US3790271A
US3790271A US00284835A US3790271DA US3790271A US 3790271 A US3790271 A US 3790271A US 00284835 A US00284835 A US 00284835A US 3790271D A US3790271D A US 3790271DA US 3790271 A US3790271 A US 3790271A
Authority
US
United States
Prior art keywords
control
sheet
belt
movement
fingers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00284835A
Other languages
English (en)
Inventor
J Donohue
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.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Application granted granted Critical
Publication of US3790271A publication Critical patent/US3790271A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/14—Electronic sequencing control
    • G03G21/145—Electronic sequencing control wherein control pulses are generated by the mechanical movement of parts of the machine, e.g. the photoconductor

Definitions

  • This invention relates to printing machines, and in particular, to electrostatic printing.
  • an endless photoreceptor element such as a belt
  • a belt movement responsive element in the form of a gear directly connected to the belt drive and having a plurality of teeth which cooperate with a fixed magnetic element to produce a train of control pulses for controlling the time sequence of processing stations.
  • Electrostatic printing machines of the type utilizing .an endless belt form of photoreceptor employ various processing stations which will uniformly charge, expose, develop, transfer, fuse, clean, etc. during any cycle of copying.
  • processing stations which will uniformly charge, expose, develop, transfer, fuse, clean, etc. during any cycle of copying.
  • the principal object of the present invention is to improve electrostatic printing machines of the type employing electrostatic photoreceptor elements in the form of a drum or belt.
  • Another object of the present invention is to maintain proper timing of the operation of the electrostatic processing stations utilized in the machine so as to effect maximum efficiency in the operation of the machine especially for high speed reproduction.
  • Periodic resetting of the train of pulses to zero is also effected, this being effectively accomplished for each sheet of paper and one spacing between it and the next sheet, or the time between the exposure flashes by the machine.
  • reset is accomplished in accordance with a precise, predetermined distance of movement of the photoreceptor element since pulse generation is directly actuated with the movement of the element and reset is effected in relation to the po'sition of the element.
  • FIG. 1 is a schematic sectional view of an electrostatic reproduction machine embodying the principles of the invention
  • FIG. 2 is a front elevational view of the drive motor for the machine
  • FIG. 3 is a schematic view of the paper supply transports in relation to a sheet registration arrangement
  • FIG. 3 is a partial plan view of one of the transports and the registration arrangement
  • FIGS. 5 and 6 are front and side elevational views respectively of a switching mechanism utilized in sheet registration reset
  • FIGS. 7, 8 and 9 are schematic views of the relative positioning of registration fingers during various sequences of operation.
  • FIG. 10 is an isometric view, partly broken away, of a variable speed imparting device.
  • the type of printing machine described for the environment of the present invention is of the electrostatic type; and particularly one that is based on the process of xerography.
  • alight image of an original to be reproduced is projected onto the sensitized surface of a xerographic plate to form an electrostatic latent image thereon.
  • the illustrated xerographic system is of the type wherein the xerographic plate is in the form of an endless belt.
  • the present invention is also adapted for integration into a belt type machine wherein the belt is a conveying element per se rather than a form of photoreceptor, and sheets of photoconductive material are positioned upon the belt for movement through processing stations. Thereafter, the latent image is developed by means of a magnetic brush developing apparatus to form a xerographic powder image, corresponding to the latent image on the plate surface. The powder image is then electrostatically transferred to a support surface to which it may be fixed by a fusing apparatus whereby the powder image is caused permanently to adhere to the support surface.
  • the electrostatically attractable developing material commonly used in magnetic brush developing apparatus comprises a pigmented resinous powder referred to here as toner and a carrier of larger granular beads formed with steel cores coated with a material removed in the triboelectric series from the toner so that a triboelectric charge is generated between the toner powder and the granular carrier.
  • the magnetizable carrier also provides mechanical control for the formation of brush bristles by virtue of magnetic fields so that the toner can be readily handled and brought into contact with the exposed xerographic surface. The toner is then attracted to the electrostatic latent image from the carrier bristles to produce a visible powder image on an insulating surface.
  • an original D to be copied is placed upon a transparent support platen P fixedly arranged in an illumination assembly generally indicated by the reference numeral 10. While upon the platen, an illumination system comprising two or more lamps and reflectors L are flash energized so as to flash light rays upon the original thereby producing image rays corresponding to the informational areas on the original.
  • the image rays are projected by means of an optical system 11 to an exposure station A for exposing the photosensitive surface of a moving xerographic plate in the form of a flexible photoconductive belt 12.
  • a corona device 13 located at a belt run extending between belt supporting rollers 14 and 15, the latter being the drive roller for the belt.
  • the exposure station extends between the roller 14 and a third support roller 16, and the belt run between these rollers is encompassed entirely by the exposure station for minimizing the space needed for the belt and its supporting rollers.
  • the exposure of the belt surface to the light image discharges the photoconductive layer in the areas struck by light, whereby there remains on the belt a latent electrostatic image in image configuration corresponding to the light image projected from the original on the supporting platen.
  • the electrostatic image passes around the roller 16 and through a developing station B located at a third run of the belt and in which there is positioned a developing apparatus generally indicated by the reference numeral [7.
  • Suitable means such as vacuum panels or tensioning means may be utilized for maintaining the belt flat in any or all three belt 'runs, and additionally the belt run related to the development zone B is maintained at an inclined plane.
  • the developing apparatus 17 comprises a plurality of magnetic brushes which carry developing material to the adjacent surface of the upwardly moving inclined photoconductive belt 12 in order to provide development of the electrostatic image.
  • the developed electrostatic image is transported by the belt 12 to a transfer station C located at a point of tangency on the belt as it moves around the drive roller whereat a sheet of copy paper is moved at a speed in synchronism with the moving belt in order to accomplish transfer of a properly registered developed image.
  • a transfer roller 19 which is arranged on the frame of the machine for contacting the non-transfer side of each sheet of copy paper as the same is brought into transfer engagement with the belt 12.
  • the roller 19 is electrically biased with sufficient voltage so that a developed image on the belt 12 may be electrostatically transferred to the adjacent side of a sheet of paper as the same is brought into contact therewith.
  • a copy sheet supplying apparatus comprising a main paper feed supply 20 and an auxiliary paper feed supply 21.
  • Each of the paper supplies is adapted to separate sheets from their respective supply stacks seriatim and to transport the sheets to a sheet registration station and eventually into contact with the developed image on the belt as the same is carried around the drive roller 15.
  • the programming or timing control arrangement of the present invention is operatively associated with each of the paper supply mechanisms 21, 22, the flash illumination devices L for producing an electrostatic latent image on the belt 12, to present a developed image at the transfer station C in timed sequence with the arrival of a sheet of paper, and is coordinated with the activation of other processing and control devices at the precise time that these elements are to function for their intended purposes.
  • the developed image is transferred to a sheet of paper, it is stripped from the belt 12, and conveyed by a conveying system 23 into a fuser apparatus generally indicated by the reference numeral 24 wherein the developed and transferred xerographic powder image on the sheet material is permanently affixed thereto.
  • the finished copy is discharged from the apparatus by conveyor 25 at a suitable point for collection externally of the apparatus.
  • the remaining toner particles remaining as residue on the developed images, and those particles otherwise not transferred are carried by the belt 12 to a cleaning apparatus 26 positioned on the run of the belt between the rollers l4, 15 adjacent the charging device 13.
  • the cleaning device comprises a corotron 27 for neutralizing charges remaining on the particles and a rotating brush 28 which operates in conjunction with a vacuum system to remove residual toner particles from the vicinity of the brush.
  • a drive means 30 comprising a constant speed-drive motor and gear box which is directly coupled to the drive roller 15 by a suitable drive chain or timing belt 31 entrained around a sprocket or pulley mounted on the shaft for the roller 15 and the output shaft 32 for the drive means.
  • the present invention provides a specific arrangement to accomplish pulse generation off of the belt drive motor, and also an entirely different arrangement for periodically resetting the pulse train to zero thereby establishing pitches.
  • a gear 33 is mounted on the drive shaft 32 for the drive means 30 and includes a predetermined number of teeth 34, each of which becomes aligned with a magnetic pickup element 35 mounted on the frame of the machine during rotation of the gear.
  • the element 35 is associated with a pulse generating device 36 which produces a square wave signal having peaks corresponding to the successive alignments of the teeth 34 with the pick up element 35. As each tooth moves adjacent the device 35, the magnetic field in the device is set to vary and thereby produce a peak in the signal.
  • Programming control for the machine processing steps is accomplished in conjunction with pitch reset wherein after a series of electrical pulses are generated corresponding to the movement of each copy sheet plus one spacing through the transfer station, reset of this number, or pitch, is accomplished when the photoreceptor belt has travelled a precise, predetermined distance as related to the movement of a copy sheet plus one spacing.
  • Pulse generation for a timing control signal then is accomplished by utilizing a direct connection of the photoreceptor belt 12 to the pulse generat ing device so as to move at all times directly therewith as described above and reset is accomplished by a reset mechanism which is reset at a predetennined position of the leading edge of each sheet of paper in proper registration to a developed image on the photoreceptor belt.
  • the programming control then is acquired by means of a timing device mechanically coupled to the shaft for the drive means 30 and which is driven into operation when the roller is rotating.
  • the pulse generating device 36 which is part of the timing apparatus is set to produce a continuous train of time pulses which can be determined by the rotational speed of the drive means 30 and the number of teeth 34 on the gear 33.
  • the device 36 is electrically connected to a counting device 37 which may be in the form of a shift register mechanism which counts the pulses of the control signal. After a number of pulses have been counted, the count is restarted or set to zero which is described herein as the pitch reset. Rather than having a predetermined number of pulses causes the reset, it is preferred to utilize the distance of movement of the belt 12 as the reset causing standard.
  • Any machine event or processing step can be initiated; that is, turned On and Off or to remain operative for any period of time on any one or more of the discrete pulses.
  • Pitch reset is accomplished during sheet registration, after each revolution of registration fingers which are arranged to be periodically interposed in the path of movement of sheets of paper just immediately prior to the insertion of each sheet into the nip of the transfer roller 19 and the belt 12 at station Operatively associated with the sheet supply is a sheet transport comprising a plurality of continuously movable belts 40 driven by the main drive by way of rollers 41.
  • the sheet supply 21 is associated with a sheet transport comprising a plurality of belts 42 movably driven around rollers 43, by the machine drive 30.
  • the driving force for the transports and 42 may be accomplished by means other than the machine drive 30, such as by individual motors or a common motor.
  • the transport 42 for the auxiliary paper supply means when in the operative mode, transports each sheet fed thereto onto the belts 40 for the main paper supply 20.
  • each of the paper supplies is provided with its own sheet transport and one of the transports directs sheets carried thereby to the other transport so that a single sheet registration mechanism may be employed for cooperation with each of the sheet supplies.
  • sheet registration is accomplished by means of a plurality of spaced registration fingers 45 mounted on a shaft 46 in alignment transversely of the paper sheet path.
  • the shaft is suitably supported for rotation on the machine frame and is operatively connected by way of a variable speed device 47 to a drive belt 48 which in turn in operatively connected to the drive means 30 to be driven at a speed coordinated with the speed of the belt 12 and the two copy sheet transporting means 40, 42.
  • a sheet S is in engagement with the fingers to become straightened in its traveling and to become positioned and timed, in other words, registered.
  • the distance between the fingers when a sheet is registered and the nip at station C is arranged to be very small and precisely known. The instant the fingers become disengaged from each sheet, the sheets will be in the nip of a pair of driven registration pinch rollers 50, 51 and these two occurrences are utilized as the pitch reset event.
  • the pulse occurring at that time by the counting mechanism 37 is given the designation as the zero pulse. All other pulses are counted from that event, until the next registration for the next sheet and the corresponding zero pulse. While the occurrence of the leading edge of the sheet S leaving the fingers 45 being synchronized with the entry of the edge into the nip of the pinch roller has been chosen as the instant for pitch reset, it is to be understood that other occurrences may be utilized for this purpose.
  • the pitch reset may be made to occur when the fingers 45 are still in engagement with the leading edge of a sheet and before it reaches the nip of the pinch rollers. What is important, however, is that this precise angular positioning of the fingers for reset must be utilized for all reset occurrences. Processing control and steps are set to be actuated or energized at predetermined pulse counts from a zero pulse, and depending upon the number of pulses to be generated, say on the order to 1000 pulses or so for each sheet registration, it will be appreciated that very close and accurate process control can be attained.
  • the lower registration pinch rollers 51 are mounted for rotation on a shaft 52 between the belts of the belt transport 40 and the fingers 45 so as not to impede operation thereof.
  • the shaft 52 is mounted for rotation in a frame (not shown) and is driven by belts 53 and pulleys 54 associated with a drive shaft 55 also mounted on the machine frame.
  • One of the shafts 55 is driven by way of a belt 56 from a clutch 57 associated with the variable speed device 47.
  • the pinch rollers 51 are given their rotative drive by the belts 48 from the machine drive motor 30.
  • the upper pinch rollers 50 are idler rollers having their peripheries the frictional engagement with the lower rollers 51 to be rotated therewith.
  • a switching mechanism 58 having a switch associated therewith to be actuated to a controlling position precisely as a sheet is registered and the fingers are in a predetermined angular position.
  • the switching mechanism 58 comprises a circular flat housing 59 having two half sections 60 and 61, the former being suitably mounted on the machine frame and the latter secured by screws 62 to the section 60 so as to form a flat circular chamber 63 within the housing 59.
  • a central boss having an opening through which the end of the registration shaft 46 projects.
  • a switch member 64 Movable within the space on chamber 63 is a switch member 64 which is secured to the shaft 46 to be rotated therewith.
  • the member 64 is arranged to be rotated within the chamber 63, and is provided with a circular magnet 65 that scribes a circular path of movement 66 around the axis of the shaft 46 during rotation thereof.
  • a casing 66 having a reed switch 67 mounted therein with a hermetical seal.
  • the switch 67 is positioned close to the flat wall of the section 60 in close proximity to the interior surface of the chamber 63.
  • the switching elements 68 of the switch 67 have their actuating ends positioned in the circular path of movement of the magnet 65 so that for each revolution of the magnet about the axis of the shaft 46, the switch 67 will be actuated from one of its controlling conditions to the other. It will be noted that the longitudinal axes of the switch elements 68 are positioned along a chord of the circular path of movement 66 of the actuating magnet 65.
  • the casing 59 may be bodily moved, within narrow limits. Such movement may be necessary in order to arrange the switch elements 68 for actuation at a precise location relative to the magnet 65 the position of which, in turn, is indicative of the angular orientation of the fingers 45.
  • the adjusting means comprises a fixed block 69 mounted on the machine frame F adjacent the casing section 54, and a follower 70 movably retained within the block 69. The follower 70 projects toward the section 60 and is received within a depression 71 formed in this section. Upon vertical movement of the follower 70, as viewed in FIG.
  • the casing 59 will be accordingly rotated slightly, as viewed in FIG. 5.
  • the block 69 is provided with an adjusting screw 72 for forcing the follower in a downward direction, and an adjusting screw 73 for forcing the follower upwardly.
  • an indicating means in the form of a pointer 74 secured to the machine frame and indicia 74a scribed on the section 60, is provided.
  • FIGS. 7, 8 and 9 illustrate the cooperative operation of the registration fingers 45, the leading edge of each sheet of paper being registered and fed to the printing machine, and the pinch rollers 50, 51.
  • the sheet 5 being supplied by either of the sheet supplies 20 or 21 arrives just as the fingers 45 move from its dotted position toward the full line position during rotation of the fingers by the shaft 46. Actually, the sheet may lag slightly in arriving at its illustrated position. At this time, the fingers are moving, in the direction of the arrow, at a speed slightly less than that of the leading edge of the sheet.
  • Rotation of the fingers 45 is accomplished by the constant speed drive motor 30 by way of the drive belt 48 and the variable speed device 47.
  • the device 47 is adapted to impart to the fingers, rotative speeds which are relatively fast during most of a revolution and slower during other portions of a revolution, and at an increasing speed during sheet registration. During this portion of a revolution, when a sheet is registered on the fly, the sheet will be fed to the registration station at a higher speed than when it is fed to the processing stations by the pinch rollers 50, 51.
  • the sheet is shown against or going against the fingers and is registered thereby so that the leading edge is free of any skew before entering the processing stations of the machine.
  • the rotative speed of the fingers continues to increase until they reach the full line position shown in FIG. 9.
  • the fingers are moving at a speed equal to the machine processing speed so that the sheet will be picked up by the pinch rollers 50, 51 for further movement through the machine.
  • the fingers experience a relative fast speed, attaining its maximum speed at about the position shown in dotted lines in FIG. 9.
  • the fingers 45 In leaving the leading edge of the sheet in FIG. 9, the fingers 45 must arrive at the position shown in dotted lines in FIG.
  • each sheet must be precisely spaced one from another as occurs as a result of the registration mechanism herein described. Assuming that the spacing between sheets for very high speed machine operation is to be approximately one and one-half inches, it will beapparent that the fingers must move very swiftly through that portion of their revolution when returning from the position shown in FIG. 9 to the position shown in FIG. 7 in order to assure this spacing.
  • the mechanism so far described is adapted as follows: Assuming the machine processing speed is 20 inches per second; that is, each sheet must be introduced to the transfer nip C at this speed and all other processing stations are functioning approximately at this speed, it is desirable that the sheet supply speed be greater in order to insure time for proper registration and to speed up total machine operation. Greater sheet supply speed also minimizes the effect of inefficiencies or mis-timing in the sheet supplying devices 20, 21. Preferably, the sheet supply feed is approximately 30 inches per second. Under these circumstances, the fingers 45 must slow each sheet from a speed of 30 inches per second to a speed of 20 inches per second in moving through the positions shown in FIGS. 7, 8 and 9.
  • the fingers as shown in full lines in FIG. 9 are at an effective speed such that the sheet travels at 20 inches per second at the instant when sheet registration occurs, and the reset switch 67 has been actuated.
  • the speed of the fingers increases slightly in moving from the positions of FIG. 7 to FIG. 9, attaining the process speed at sheet registration. After this occurs, faster increases in finger rotative speed are imparted to the fingers so that at their dotted line positions in FIG. 9, their speed may approximate 40 inches per second, the maximum so attained. After this, the speed may gradually lessen until the dotted position of FIG. 7 is reached wherein the speed may be approximately 18 inches per second, a speed lower than process speed and the minimum for any one complete rotation of the fingers. After leaving the dotted position of FIG. 7, the fingers will be in position to intercept the leading edge of a sheet.
  • the defined registration zone is a registration window having a width in which registration can take place.
  • This window corresponds to approximately 90 of rotation of the fingers and allows a relatively wide margin of error in positioning of sheets of paper by the individual sheet supplies. During this travel of a sheet through the registration zone, it is only necessary that it be in contact with the fingers at the time registration is to be effected.
  • the speed of the sheet will be slower from .its entry speed of inches per second to something less than the process speed of 20 inches per second and then stabilized at the process speed at registration. While at the slower speeds, the sheets will continue to experience a feeding force produced by either of the transport conveyors or 42. During this time, the belts of the transport will slip relative to the adjacent surfaces of the sheets.
  • This device includes an inner cylindrical element which isin the form of a pulley to which the belt 56 is applied for effecting rotation of the pinch rollers 50, 51.
  • a circular member 76 which is also in the form of a pulley.
  • the drive belt 48 is applied to this member for imparting, eventually, rotation to the registration fingers 45.
  • the pulley member 76 is rotatably related to and held upon'the cylindrical element 75 by a retaining ring 77 on one side and by a flange 78, formed on the element, at the other end.
  • a flexible ring-type clutch element 80 retained between cooperating surfaces of the element 75 and member 76 serves as a clutch therefor. Rotation of the pulley member 76 in one direction will impart rotation to the pulley element 75 in the same direction, but rotation of the pulley member 76 in the reverse direction will have no effect upon the pulley element 75.
  • the element 75 and therefore the member 76 and clutch element 80 are supported upon a cylindrical retaining block 81 which is formed at one end with a flange 82 arranged to be secured against movement to the machine frame.
  • a circular needle bearing 83 Surrounding the peripheral surface of the cylindrical block is a circular needle bearing 83 held in place by the flange 82 and a detachable circular plate 84.
  • the inner surface of the element 80 is force fitted to the bearing 83 and in this way the structure 75, 76 and 80 is mounted for rotation upon the fixed block 81.
  • the block 81 is formed with a through opening 85 having its axis eccentric relative to the axis of the block.
  • the registration shaft 46 projects through this opening and has its axis also eccentric relative to the block 81.
  • an actuator arm 86 At the end of the shaft 46 which terminates within the cylindrical member 76 there is detachably secured an actuator arm 86 so as to be rotatable therewith.
  • the arm 86 is formed with a slot 87 having its longitudinal axis normal to the axis of the shaft 46 so as to be able to define a path of revolution.
  • the pulley element 75 and the pulley member 76 have their axes of rotation, designated by the numeral 90, coincident with the axis of the block 81 and eccentric relative to the axis of the shaft 46.
  • the pulley element 75 is driven therewith thereby causing revolving of the drive pin 88 about the axis 90.
  • the drive pin revolves, it imparts rotation to the arm 86 which in turn, imparts rotation to the shaft 46.
  • Continuous revolving action by the pin 88 at constant speed, and its cooperating reciprocating movement relative to the slot 87, will impart variable speeds of rotation to the registration fingers 45.
  • FIGS. 7, 8 and 9 the drive pin 88, the actuating arm 86, the slot 87, the axis 90, and the shaft 46 are shown in their relative positions for imposing the variable rotative motion upon the registration fingers.
  • the revolving path of movement 100 for the pin 88 is shown as concentric to the axis and eccentric relative to the axis of the shaft 46.
  • the rotative speed thereof is slowest and the pin 88 is on one side of the axis 90 or diametrically opposed relative to the axis of the shaft 46.
  • the fingers are formed with curved surfaces 101 which extend back toward the sheet supplies, to be contacted at different points thereon by each sheet being registered as they travel through the window.
  • distance of movement of the sheet is 10 percent less than the movement of the fingers.
  • the surfaces 101 are also arranged so that the leading edge of each sheet will orient as near as possible perpendicular to the surface and not slide off the surface during travel through the registration zone. At the instant a sheet is registered and at the nip of the rollers 50, 51, the surfaces 101 are exactly normal to the plane of the sheet.
  • the reset switch 67 is in circuit with the pulse counter 37 which may be part of the machine logic LE, and actuation of the switch will initiate pulse recounting until subsequent actuation, in turn, produce corresponding re-counting. In this manner, pitch reset is accomplished off the registration mechanism and is utilized as the starting point, at least countwise, for machine control, processing and sheet monitoring.
  • the logic equipment LE is operatively connected to the pulse generator 36, the counting mechanism 37, clutches (not shown) for the paper sheet supplies 20,21, the illumination lamps L to the corotrons 13, 27, the motor for the brush 28, the fuser 24 and the developing apparatus l7, and arranged so that these devices are functionally activated and controlled by a different counted number of the pulses in time sequence.
  • the photoreceptor belt 12 is continuously being exposed by flashing imaging rays, the belt may contain a number of electrostatic images, for example, five or more images between the exposure and transfer stations.
  • the paper path between the paper supplies and the transfer station C may contain two or three sheets.
  • any particular time cycle made operative by the timing arrangement may then produce sequential operation of the above-mentioned devices in an order which affects different images, transfer operations and sheets of paper.
  • the programming control system will maintain timing control for five or more pitches concurrently processwise. For instance, after the machine has been turned On and the drive means 30 is in full drive operation so that control pulses are being produced, counted and reset by the reset switch 67, and the registration fingers are rotating, poised for the expectant sheets, the lamps L may be energized as the first event when the machine is placed in print condition. It will be noted that upon initial machine use, a sheet S will not have been sepa rated from one of its supply stacks before the first flash of an original D is made.
  • the first of a series of produced latent images may be in or nearing the developing zone, and as images are so produced, the first one, now developed, is adjacent the transfer station in timed relationship to a sheet being registered.
  • the short distance yet to travel after the registration fingers 45 leave the sheet is factored into the pitch distance belt 12 travels so that the developed image and the exact positioning it is to occupy on the sheet will be in precise registration at transfer.
  • other devices may be activated to continue the processing of reproductions.
  • all the corotrons would have been energized as well as the paper jam detection devices (not shown) located along the paper path of movement may be sensed in sequence for the different sheets of paper in the path in order to insure the proper positioning of the sheets.
  • the fuser apparatus would have been energized before the first sheet arrived there and successive energization of the cleaning and discharging elements also would have occurred.
  • the cycle begins again and will produce the identical series of operations as discussed above.
  • An electrostatic printing apparatus for reproducing copies of an original having an endless movable member having a photoreceptor surface and a plurality of processing devices arranged when activated for producing electrostatic latent images on the surface, for developing the images and for transferring developed images to moving support material, and drive means operatively connected to the member for driving the same in the endless path, the improvement comprising,
  • control member operatively connected to the drive means to be moved in a path of control during operation thereof, said control member including a plurality of control points movable along said path of control during movement of the control member, means cooperable with said control points for producing series of control signals in accordance with the movement of the control points in said path of control, and means responsive to said control signals for controlling activation of at least one of the processing devices.
  • An electrostatic printing apparatus for reproducing copies of an original having an endless movable photoreceptor member and a plurality of processing devices arranged when activated for producing electrostatic latent images on the member, for developing the images and for transferring developed images to moving support material, and drive means operatively connected to the member for driving the same in the endless path, the improvement comprising,
  • a rotatable element operatively connected to the drive means to be rotated during operation thereof, said element including control points movable along a path of rotation during rotation of the element, means cooperable with said control points for producing a series of control signals in accordance with the rotative movement of the control points, and means responsive to said control signals for controlling activation of at least one of the processing devices.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Fixing For Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
US00284835A 1972-08-30 1972-08-30 Processing control system for printing machines Expired - Lifetime US3790271A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US28483572A 1972-08-30 1972-08-30

Publications (1)

Publication Number Publication Date
US3790271A true US3790271A (en) 1974-02-05

Family

ID=23091706

Family Applications (1)

Application Number Title Priority Date Filing Date
US00284835A Expired - Lifetime US3790271A (en) 1972-08-30 1972-08-30 Processing control system for printing machines

Country Status (10)

Country Link
US (1) US3790271A (US06826419-20041130-M00005.png)
JP (1) JPS4960741A (US06826419-20041130-M00005.png)
BR (1) BR7305650D0 (US06826419-20041130-M00005.png)
CA (1) CA986173A (US06826419-20041130-M00005.png)
DE (1) DE2318297C3 (US06826419-20041130-M00005.png)
ES (1) ES418256A1 (US06826419-20041130-M00005.png)
FR (1) FR2198181B1 (US06826419-20041130-M00005.png)
GB (1) GB1439771A (US06826419-20041130-M00005.png)
IT (1) IT993067B (US06826419-20041130-M00005.png)
NL (1) NL168634C (US06826419-20041130-M00005.png)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912390A (en) * 1973-08-31 1975-10-14 Oce Van Der Grinten Nv Electrophotographic apparatus
US4215931A (en) * 1978-04-18 1980-08-05 Olympus Optical Co., Ltd. Electrophotographic apparatus
US4270860A (en) * 1978-04-18 1981-06-02 Olympus Optical Co., Ltd. Electrophotographic apparatus employing a control assembly for controlling successive duplication of a document
US4529294A (en) * 1984-03-16 1985-07-16 Xerox Corporation Document scanning drum and flash exposure copier
US4684240A (en) * 1984-03-16 1987-08-04 Xerox Corporation Document scanning drum and flash exposure copier
US4757346A (en) * 1984-03-16 1988-07-12 Xerox Corporation Optical system for scanning and flash exposing of document
US4826148A (en) * 1984-03-16 1989-05-02 Xerox Corporation Sheet registration in copier for multiple sizes of sheets
US5105208A (en) * 1990-02-23 1992-04-14 Kabushiki Kaisha Toshiba Image forming apparatus with good response motor servo control
US5313254A (en) * 1992-12-23 1994-05-17 Xerox Corporation Motion control system for printing machines

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2654076C3 (de) * 1975-11-28 1994-12-22 Canon Kk Kopiergerät
FR2336714A1 (fr) * 1975-12-27 1977-07-22 Canon Kk Machine de reprographie
JPS6033270B2 (ja) * 1978-04-11 1985-08-01 ミノルタ株式会社 複写機における紙詰り検出装置
JPS57141649A (en) * 1981-12-14 1982-09-02 Canon Inc Copying apparatus
JPS6254281A (ja) * 1986-06-06 1987-03-09 Minolta Camera Co Ltd 複写機等における制御装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501236A (en) * 1967-02-20 1970-03-17 Addressograph Multigraph Photoelectrostatic print-out machine
US3512885A (en) * 1964-09-30 1970-05-19 Xerox Corp Accounting device for xerographic reproducing apparatus
US3659109A (en) * 1970-03-16 1972-04-25 Eastman Kodak Co Photosensitive controlled machine programmer
US3698805A (en) * 1971-10-21 1972-10-17 Eastman Kodak Co Control apparatus for electrophotographic apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3586437A (en) * 1968-10-28 1971-06-22 Stromberg Datagraphix Inc High-speed printer
DE2112624A1 (de) * 1970-03-16 1971-09-30 Eastman Kodak Co Elektrographisches Geraet
CA928375A (en) * 1970-03-30 1973-06-12 Eastman Kodak Company Paper feed and exposure synchronizer
CA967228A (en) * 1970-12-14 1975-05-06 James M. Donohue Programming control system for printing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512885A (en) * 1964-09-30 1970-05-19 Xerox Corp Accounting device for xerographic reproducing apparatus
US3501236A (en) * 1967-02-20 1970-03-17 Addressograph Multigraph Photoelectrostatic print-out machine
US3659109A (en) * 1970-03-16 1972-04-25 Eastman Kodak Co Photosensitive controlled machine programmer
US3698805A (en) * 1971-10-21 1972-10-17 Eastman Kodak Co Control apparatus for electrophotographic apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912390A (en) * 1973-08-31 1975-10-14 Oce Van Der Grinten Nv Electrophotographic apparatus
US4215931A (en) * 1978-04-18 1980-08-05 Olympus Optical Co., Ltd. Electrophotographic apparatus
US4270860A (en) * 1978-04-18 1981-06-02 Olympus Optical Co., Ltd. Electrophotographic apparatus employing a control assembly for controlling successive duplication of a document
US4529294A (en) * 1984-03-16 1985-07-16 Xerox Corporation Document scanning drum and flash exposure copier
US4684240A (en) * 1984-03-16 1987-08-04 Xerox Corporation Document scanning drum and flash exposure copier
US4757346A (en) * 1984-03-16 1988-07-12 Xerox Corporation Optical system for scanning and flash exposing of document
US4826148A (en) * 1984-03-16 1989-05-02 Xerox Corporation Sheet registration in copier for multiple sizes of sheets
US5105208A (en) * 1990-02-23 1992-04-14 Kabushiki Kaisha Toshiba Image forming apparatus with good response motor servo control
US5313254A (en) * 1992-12-23 1994-05-17 Xerox Corporation Motion control system for printing machines

Also Published As

Publication number Publication date
BR7305650D0 (pt) 1974-09-05
IT993067B (it) 1975-09-30
DE2318297B2 (de) 1981-07-23
DE2318297C3 (de) 1982-03-25
FR2198181B1 (US06826419-20041130-M00005.png) 1977-11-10
CA986173A (en) 1976-03-23
DE2318297A1 (de) 1974-03-14
ES418256A1 (es) 1976-03-01
NL168634B (nl) 1981-11-16
JPS4960741A (US06826419-20041130-M00005.png) 1974-06-12
NL168634C (nl) 1982-04-16
GB1439771A (en) 1976-06-16
FR2198181A1 (US06826419-20041130-M00005.png) 1974-03-29
NL7311527A (US06826419-20041130-M00005.png) 1973-11-26

Similar Documents

Publication Publication Date Title
EP0079222B1 (en) Copying apparatus and method of copy sheet registration
US3960445A (en) Color highlighting electrophotographic printing machine
US3790271A (en) Processing control system for printing machines
EP0541260B1 (en) Apparatus for deskewing and side registering a sheet
US3790270A (en) Registration reset system
US3809472A (en) Pre-development exposure assembly
US4251154A (en) Electrophotographic color copier
US3698805A (en) Control apparatus for electrophotographic apparatus
EP0024154B1 (en) Paper feed and image transfer for electrostatographic copiers and duplicators
US3930725A (en) Multiple sheet feeding system for electrostatographic printing machines
US3781004A (en) Conveying system for electrostatographic printing machines
US3796486A (en) Programming control system for printing machine
US3917256A (en) Dual purpose sheet handling apparatus
CA1164396A (en) Trail edge copy registration system
US4359219A (en) Direct control paddle wheel
US4826148A (en) Sheet registration in copier for multiple sizes of sheets
US3902715A (en) Sheet registration for paper handling apparatus
US3804507A (en) Processing control device for printing machines
US3718394A (en) Variable sheet length paper feed and cutting system
US3880516A (en) Diagnostic circuit board
US3918705A (en) Processing control device for printing machines
US3744900A (en) Paper feed and exposure synchronizer
US4179112A (en) Apparatus for conveying sheetlike original material to be copied
US3995950A (en) Exposure system for electrostatic machines
US4111541A (en) Exposure system for electrostatic reproduction machines