US3804507A - Processing control device for printing machines - Google Patents

Processing control device for printing machines Download PDF

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Publication number
US3804507A
US3804507A US00284834A US28483472A US3804507A US 3804507 A US3804507 A US 3804507A US 00284834 A US00284834 A US 00284834A US 28483472 A US28483472 A US 28483472A US 3804507 A US3804507 A US 3804507A
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Prior art keywords
sheet
sheets
switch
fingers
belt
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Expired - Lifetime
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US00284834A
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English (en)
Inventor
G Koch
L Hubler
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Xerox Corp
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Xerox Corp
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Priority to US00284834A priority Critical patent/US3804507A/en
Priority to NL7311982A priority patent/NL7311982A/xx
Priority to US394372A priority patent/US3918705A/en
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Publication of US3804507A publication Critical patent/US3804507A/en
Anticipated expiration legal-status Critical
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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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/10—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position
    • B65H9/101—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position acting on the edge of the article

Definitions

  • This invention relates to printing machines, and in particular toelectrostatic printing of the type utilizing an endless photoreceptor element, such as a drum or belt, and a series of control signals for controlling machine processing.
  • Electrostatic printing machines of the type utilizing as endless belt forms 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 and series of control pulses for the processing of each copy of an original.
  • Another object of the present invention is to maintain proper timing of the operation of the electrostatic processing stationsutilizecl in the machine so as to effect maximum efficiency in the operation of the machine especially for high speed reproduction.
  • FIG. ii 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. 4 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. llll 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.
  • a light 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 aform of photoreceptor, and sheets of photoconductive material are positioned upon the belt for movement through processing stations.
  • 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 power 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 powderreferred 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 broughtinto 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 l) 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 17.
  • Suitable means such as vacuum panels or te'nsioning means may be utilized for maintaining the belt flat in any or all three belt runs, and additionally the belt-run related to the devel opment 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 photoeonductive 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 isoperatively 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 therebyproduce 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.
  • Plus generation for a timing control signal then is accomplished by utilizing a direct connection of the photoreceptor belt 12 to the pulse generating 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 predetermined 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 53.
  • 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.
  • a sheet transport comprising a plurality of continuously movablebelts 40 driven by the main 'drive by way of rollers'41.
  • the sheet supply 211 is associated with a sheet transport comprising a plurality of belts 42 movably driven around rollers 43, by the machine drive 30.
  • Thedriving force for the transports 4t) 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 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 variablespeed device 47 to a drive belt 48 which in turn is operatively connected to the drive means 30 to be driven at a speed coordinated withthe speed of the belt 12 and the two copy sheet transporting means 40, 32.
  • 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 stationC 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 1 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 34 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 1,000 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 soas 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 58 from the machine drive motor 30.
  • the upper pinch rollers are idler rollers having their peripheries in frictional engagement with the lower rollers 51 to be rotated therewith.
  • a switching mechanism 55 having a'switch associated therewith to be actuated to a controlling position precisely as a sheet is registered-and the fingers arein 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 forms 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 65, 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 65.
  • the switching elements 65 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 actuatedfrom one of its controlling conditions to the other. It will be noted that the longitudinal axes of the switch elements 65 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 70 formed in this section. Upon vertical movement of the follower 70, as viewed in FIG.
  • the casing 59 in either direction, 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 I adjusting screw 73 for forcing the follower upwardly.
  • 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 fedto the printing machine, and the pinch rollers 50, 51.
  • the sheet ','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 station 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 positionshown 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 be apparent 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 registration fingers 45 rotate with their shaft 46 at variable speeds, and this motion is imparted by way of .the variable speed device 47.
  • This device includes an inner cylindrical element 75 which is in 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 mounteded on and exteriorly of the element and concentric therewith, is a circular member 76 which is also in the form of a pulley.
  • the drive belt 46 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 76, formed on the element, at the other end.
  • a flexible ring-type clutch element 60 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 atone end with a flange 82 arranged to be secured against movement to the machine frame.
  • a circular needle bearing 63 Surrounding the peripheral surface of the cylindrical block is a circular needle bearing 63 held in place by the flange 82 and a detachable circular plate 84.
  • the inner surface of the element 60 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 as 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 66 At the end of the shaft 46 which terminates within the cylindrical member 76 there is detachably secured an actuator arm 66 so as to be rotatable therewith.
  • the arm 66 is formed with a slot 87 having its longitudinal axis normal to the axis of the shaft46 so as to be able to define a path'of revolution.
  • a drive pin 88, formed on the inner cylindrical surface of the element extends into the slot 67 and is adapted to travel reciprocably therealong.
  • the pulley element 75 and the pulley member 76 have their axes of rotation, designated by the numeral 96, coincident with the axis of the block 61 and eccentric relative to the axis of the shaft 46.
  • the pulley element 75 is driven therewith thereby causing revolving of the drive pin 66 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 66 at constant speed, and its cooperating reciprocating movement relative to the slot 67 will impart variable speeds of rotation to the registration fingers 45.
  • FIG. 7 the revolving path of movement 160 for the pin 66 is shown as concentric to the axis 90 and eccentric relative to the axis of the shaft 46.
  • the rotative speed thereof is slowest and the pin 66 is on one side of the axis 90 or diametrically opposed relative to the axis of the shaft 46.
  • the rotational speed of the fingers increases since the pin is moved out of its diametrically opposed relationship and toward a position which is on the same side of the axis 96 as the shaft.
  • this repositioning is shown in progress and in FIG. 9, completed.
  • 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 17, 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 Since 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. Similarly, 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 placedin print condition. It will be noted that upon initial machine use, a sheet S will not have been separated 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 devcies 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 photoreceptor surface and a plurality of processing stations arranged when activated for producing electrostatic latent images on the surface, for developing the images, for feeding sheets of support material, and for transferring developed images to moving support material, and programming circuit means operable in cycles of control signals for controlling processing of each copy reproduced by the printing apparatus at one copy for each cycle, the improvement comprising:
  • a movable abutment engageable with the sheets of support material to register each sheet as the same moves toward the transfer processing station whereat developed images are transferred, means for moving said abutment into and out of engagement with the sheets, and
  • switching means connected in the programming circuit means for determining the cycles of the programming circuit means and actuable into a controlling condition for each registered sheet of support material, said switching means including a switch, and an actuator element operatively connected to the movable abutment for actuating said switch for each sheet of material moving past a predetermined position in its movement toward the transfer station.
  • the apparatus of claim 1 including a shaft rotatably supporting said abutment and wherein said actuator is mounted on said shaft to be rotated with said abutment.
  • said switch includes switch elements movable into and out of contact and said actuator element includes a magnet arranged for movement adjacent said elements for controlling contacting thereof.
  • control means for controlling actuation of said processing stations to produce copies
  • said locating means including a switch adapted when in a preselected position to identify a predetermined block of said control signals; and signal responsive means for operating said control means through a predetermined program cycle in which said processing stations are actuated in accordance with certain ones of said control signals from said block of signals to produce copies.

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US00284834A 1972-08-30 1972-08-30 Processing control device for printing machines Expired - Lifetime US3804507A (en)

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US00284834A US3804507A (en) 1972-08-30 1972-08-30 Processing control device for printing machines
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US394372A US3918705A (en) 1972-08-30 1973-09-04 Processing control device for printing machines

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Cited By (6)

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US4128327A (en) * 1976-10-26 1978-12-05 Rank Xerox Limited Transfer material feed apparatus for electrophotographic copying machines
US4168059A (en) * 1977-12-27 1979-09-18 Pitney-Bowes, Inc. Compensating means for adjusting the resetting of paper gate device
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
US4288069A (en) * 1979-11-29 1981-09-08 Burroughs Corporation Cam operated document stop for high speed item sorter
US4473222A (en) * 1982-03-26 1984-09-25 Eastman Kodak Company Sheet handling apparatus

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US1991003A (en) * 1931-02-06 1935-02-12 Miehle Printing Press & Mfg Method of and means for fee sheets
US2787951A (en) * 1954-01-18 1957-04-09 Garland H Shipley Automatic form stop attachment for addressograph machines
US3659109A (en) * 1970-03-16 1972-04-25 Eastman Kodak Co Photosensitive controlled machine programmer
US3693581A (en) * 1970-10-29 1972-09-26 Xerox Corp Toner dispenser circuit for electrostatographic apparatus

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US1991003A (en) * 1931-02-06 1935-02-12 Miehle Printing Press & Mfg Method of and means for fee sheets
US2787951A (en) * 1954-01-18 1957-04-09 Garland H Shipley Automatic form stop attachment for addressograph machines
US3659109A (en) * 1970-03-16 1972-04-25 Eastman Kodak Co Photosensitive controlled machine programmer
US3693581A (en) * 1970-10-29 1972-09-26 Xerox Corp Toner dispenser circuit for electrostatographic apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4128327A (en) * 1976-10-26 1978-12-05 Rank Xerox Limited Transfer material feed apparatus for electrophotographic copying machines
US4168059A (en) * 1977-12-27 1979-09-18 Pitney-Bowes, Inc. Compensating means for adjusting the resetting of paper gate device
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
US4288069A (en) * 1979-11-29 1981-09-08 Burroughs Corporation Cam operated document stop for high speed item sorter
US4473222A (en) * 1982-03-26 1984-09-25 Eastman Kodak Company Sheet handling apparatus

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