US3501236A - Photoelectrostatic print-out machine - Google Patents

Photoelectrostatic print-out machine Download PDF

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Publication number
US3501236A
US3501236A US617094A US3501236DA US3501236A US 3501236 A US3501236 A US 3501236A US 617094 A US617094 A US 617094A US 3501236D A US3501236D A US 3501236DA US 3501236 A US3501236 A US 3501236A
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United States
Prior art keywords
sheet
station
copy sheet
circuit
copy
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US617094A
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English (en)
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William R Maloney
Arthur L Hallquist
Daniel B Granzow
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AB Dick Co
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Multigraphics Inc
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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
    • G03G15/70—Detecting malfunctions relating to paper handling, e.g. jams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/46—Applications of alarms, e.g. responsive to approach of end of line
    • B41J29/48—Applications of alarms, e.g. responsive to approach of end of line responsive to breakage or exhaustion of paper or approach of bottom of paper
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K13/00—Conveying record carriers from one station to another, e.g. from stack to punching mechanism
    • G06K13/02—Conveying record carriers from one station to another, e.g. from stack to punching mechanism the record carrier having longitudinal dimension comparable with transverse dimension, e.g. punched card
    • G06K13/06—Guiding cards; Checking correct operation of card-conveying mechanisms

Definitions

  • a photoelectrostatic print-out machine receives data signals which are used to image copy sheets at an exposure station. The machine monitors the movement of the copy sheets and senses the movement in accordance with a copy order. A pair of photoelectric sensing devices are placed along a common line transverse to the path of the copy sheets, at various locations. The sensors are responsive to light outside the range of radiation to which the copy sheets is sensitive.
  • Counter circuitry along the path of the copy sheets monitors the movement in accordance with data signals received at the exposure station.
  • a pair of sequentially operated nonstable timing circuits sense the movement of copy sheets between the sensor positions. If the copy sheets do not move as prescribed, the transport is inhibited and the further transmission of data signals is prevented.
  • This invention relates to a photoelectrostatic recorder or print-out apparatus and, more specifically to such an apparatus including new and improved means for monitoring and controlling the movement of copy sheet or web material through the apparatus.
  • one object of the present invention is to produce a new and improved photoelectrostatic print-out machine.
  • Another object is to provide a photoelcctrostatic printout apparatus including new and improved means for controlling and monitoring the movement of sheet or web material through the apparatus.
  • a further object is to provide a system for monitoring and controlling the movement of sheet or web material along a path and past a plurality of stations spaced along the path.
  • a further object is to provide a system of this type in which the sheet or web material is intermittently moved relative to one station and continuously moved relative to another one ofthe stations.
  • Another object is to provide a system for monitoring and controlling the movement of sheet or web material along a path and past a plurality of stations spaced along the path in which the successful completion of movement along one portion of the path automatically inhibits the monitoring of the completed portion of the movement and initiates the monitoring of the movement of the sheet or web material along the next portion of the path.
  • Another object is to provide a photoelectrostatic printout apparatus in which the transmission of signals used to control the development of images is interlocked with the movement of sheet or web material through the apparatus.
  • a further object is to provide a system for controlling a photoelectrostatic print-out unit including new and improved means for detecting a skewed condition of sheet or web material.
  • a further object is to provide a new and improved control for monitoring the intermittent movement of sheet or web material between two spaced points on a path of movement.
  • Another object is to provide a new and improved unit for sensing or detecting the position of light sensitive sheets along a path of movement thereof.
  • Another object is to provide a sensing or detecting unit for photoelectrically detecting the pressure of copy material having a light sensitive characteristic.
  • an embodiment of the invention comprises a photoelectrostatic print-out or recording machine that is adapted to produce copies or prints in accordance with electrical input signals derived, for instance, from a central data processor or a communication link.
  • the photoelectrostatic print-out machinet includes a supply of photoelectrostatic copy sheets which are fed in sequence through a charging station in which a uniform electrostatic charge is placed on the photosensitive surface of the sheet, an exposing station at which a latent electrostatic image is formed by means such as a cathode ray tube in dependence on incoming electrical signals representing the material to be recorded, a developing station in which the latent electrostatic image is developed to provide a powder image by the selective deposition of toner powder, and a fusing station in which the powder image is placed in permanent form by the application of heat.
  • the present invention is directed to a new and improved system for monitoring and controlling the movement of the Copy material through the various stations in a synchronized and interlocked relation with the incoming signals representing the material to be recorded.
  • the system establishes a predetermined program of movement for the copy material and detects deviation therefrom as an indication of abnorbalities or malfunctions.
  • a first feeding assembly in the machine feeds a copy sheet from the supply thereof to a iirst detecting station at which the sheet is checked to determine whether it is fed in a proper position or in a skewed position.
  • the new and improved skew detecting assembly inhibits further operation of the machine if the. sheet is fed in a skewed condition. If the sheet has been properly fed, control over sheet movement is transferred to the data signal source and a second feeding means is rendered effective to advance the copy sheet through the corona charging station at which a uniform electrostatic charge is imparted to both surfaces of the copy sheet.
  • This sheet is then fed past the face of a cathode ray tube at an exposure station to generate a latent electrostatic image on the copy sheet in dependence on the electrical signals received from the data signal source.
  • the second sheet feeding means is operated intermittently by the data source to synchronize the movement of the sheet past the cathode ray tube with the received signals.
  • a pulse generator operated in synchronism with the second feed means supplies a series of signals to a counter representing the increments of movement imparted to the copy sheet. These signals are counted, and an output signal is developed by the counter when the number of signals received indicates that the leading edge of the sheet should be at a second detecting station.
  • a logic device coupled to the output of the counter and the second detecting station provides an alarm indication that a paper jam has occurred if the copy sheet does not reach the second detecting station at the expected time indicated by the output signal from the counter. This places the machine in an alarm condition to prevent further attempts to record subsequent information until the paper jam has been cleared.
  • the control circuit transfers control over the second drive means from the data signal source to the local control circuit and renders the first feeding means effective to advance another copy sheet from the supply thereof toward the corona charging and exposing stations.
  • the copy sheet in passing the second detecting station, enters the developer station and is advanced therethrough by an additional drive means.
  • the second detecting station also starts the operation of a timing circuit which sets a time interval in which the copy sheet must pass through the developer to a third detecting station interposed between the developing station and the fusing station.
  • the leading edge of the copy sheet passing through the developer does not reach the third detecting station within the time interval set by the timing circuit started by the second detector, a visible indication of the improper operation of the machine is provided, and the prior feeding means in the machine are rendered ineffective until such time as the jam is cleared.
  • the alarm control indicator controlled by the first timing circuit is inhibited, and a second timing circuit is placed in operation to set a time interval in which the developed copy sheet must pass through the fusing station to a fourth detecting station.
  • the fourth detecting station on sensing the arrival of the leading edge of the copy sheet, inhibits the operation of the second timing circuit to provide an alarm indication. If the copy sheet is not advanced to the fourth detecting station within the time interval set by the second timing circuit, a visible alarm is provided,
  • the system also includes novel means for detecting the presence of the copy sheet at the various positions along its path of movement It would be desirable to avoid the use of sensing means such as switches because of the necessity of physically contacting the copy sheet.
  • Photoelectric sensing means avoids physical contact with the sheet, but since the sheet has a light sensitive characteristic, conventional photoelectric sensing or detecting units are likely to alter or deface the image.
  • the novel photoelectric sensing or detecting means of the present invention comprises light sources and a light responsive means operating in a portion of the spectrum to which the light sensitive coating of the copy sheet does not respond.
  • FIG. 1 is a schematic circuit diagram of a photoelectrostatic print-out unit embodying the present invention
  • FIGS. 2A and 2B illustrate a logic symbol and a typical circuit of a trigger circuit used in the circuit diagram shown in FIG. l;
  • FIG. 3 is a perspective view illustrating a photoelectric sensing or detecting unit used in the system shown in FIG. 1.
  • FIG. 1 of the drawings therein is illustrated a photoelectric print-Out unit or recorder which is indicated generally as 10 and which is adapted to record or print data or information received from a data signal source 12 on a copy sheet or web 14 (FIGS. 1 and 3).
  • the data signal source 12 can comprise a termination for a communication link or equip ment for interfacing the print-out recorder 10 with a central data processing unit.
  • the data signal source 12 supplies an intelligence signal to an electroluminescent transducer, such as a cathode ray tube 16, representing the intelligence or data to be recorded and also supplies other control signals for controlling and synchronizing the movement of the copy sheet 14 during the period in which intelligence signals are supplied to the cathode ray tube 16.
  • the operation of the print-out recorder 10 is interlocked with the data signal source 412 in such a manner as to prevent loss of intelligence signals due to malfunctioning to the recorder 10.
  • a clutch 18 interposed lbetween a drive motor 20 and one or a plurality of feed rollers 22 is energized to feed a copy sheet 14 from a stack thereof toward a corona charging station 24.
  • the copy sheets 14 could also be cut from a roll of web stock as required.
  • a drive system including a motor 26 which is selectively energized by a power supply 28 and which is coupled to a plurality of spaced sets of drive rollers 30, 32, and 34 receives the leading edge of the copy sheet 14 advanced by the rollers 22 and feeds the copy sheet 14 past the charging station 24 and an exposing station indicated generally as 36 at which the uniform charge previously imparted to the copy sheet 14 is selectively varied by the cathode ray tube 16 to develop a latent electrostatic image.
  • the drive system actuated by the motor 26 is intermittently operated under the control of a circuit forming a part of the print-out recorder 10 until the leading edge of the copy sheet 14 is advanced through the nip of the drive rollers 30 to a skew detecting station 38 at which the sheet 14 is checked by a skew detecting circuit 40 to determine whether the sheet has been fed by the rollers 22 in a proper or skewed position. If the sheet 14 has been fed in a skewed condition, the drives actuated by the motors 2.0 and 26 are disabled, an inhibiting signal is supplied to the data signal source 12 to prevent further attempts to record information, and a visible indication of the malfunction is provided.
  • the skew detecting circuit 40 upon detecting the proper feeding of the copy sheet 14, disables further operation of the copy sheet feeder actuated by the motor and transfers control over the operation of the drive motor 26 to the data signal source 12.
  • the signal source 12 now controls the energization of the motor 26 to advance the copy sheet 14 through the corona charging station 24 and the exposure station 36 in synchronism with the application of signals representing intelligence to be recorded to the cathode ray tube 16. Because of the nature of the information representing signals supplied by the data signal source 12, the motor 26 is intermittently operated to advance the copy sheet 14'through the exposure station 36.
  • the print-out apparatus 10 includes a jam detecting circuit indicated generally as 42 which is enabled under the control of the data signal source 12 when the production of a copy is initiated.
  • the input of the control circuit 42 is provided with a series of input pulses representing the increments of movement imparted to the copy sheet 14 by the motor 26 by a pulse generator including a gear element 44 which is driven by and in synchronism with the motor 26 and which is coupled to a gear element 46.
  • the gear element 46 includes an opening 48 lying along its diameter and interposed between an electric lamp 50 and a light responsive means or photocell 52.
  • the photocell 52 is illuminated twice for each cycle of rotation of the gear 46 and thus provides a series of pulses to the input of the jam detecting or monitoring circuit 42 proportional to the increments of movement imparted to the copy sheet 14 by the drive system powered by the motor 26.
  • the circuit 42 counts these pulses as an indication of the movement that should be imparted to the copy sheet 14.
  • the leading edge of the copy sheet 14 passes beyond the last set of rollers 34 driven by the motor 26, it is fed between the rst of two pairs of rollers 54 and 56 which are continuously driven by a drive motor 58 at all times during the operation of the machine 10 at which a jam or a malfunction has not occurred.
  • the leading edge of the copy sheet 14 is further transported by the rollers 54 and 56 to a detecting station 60.
  • a signal is fed to the control circuit 42 to indicate that the copy sheet has reached this station.
  • the control circuit 42 is set so that it supplies an output signal when enough pulses have been received from the generator including the photocell 52 to advance the copy sheet 14 to the detecting station 60.
  • the signal supplied by the detecting station 60 provides an inhibit to prevent the output signal from the circuit 42 from actuating an alarm when the copy sheet 14 has reached the detecting station 60 at the expected time.
  • the circuit 42 provides an output signal.
  • a visual indication is provided, indicating that a paper jam has occurred between the stations 38 and 60, and a signal is supplied to the data signal source 12 to prevent further attempts to produce copies.
  • a detecting station 62 actuated by the trailing edge of the copy sheet 14 bearing the electrostatic image supplies a signal that transfers control over the motor 26 to the control circuit in the print-out apparatus 10 and also enables the drive or feeding system controlled by the motor 20 to start the movement of another copy sheet 14 toward the corona charging station 24.
  • the leading edge of the copy sheet 14 on passing the detector station 74 enters a fusing station 76 in which the toner particles are fused or placed in permanent form by the application of heat.
  • a drive system including an endless belt 78 and spaced sets of drive rollers 80 and 82 driven by a motor 84 advances the copy sheet 14 through the fuser station 76.
  • the detection station 74 initiates the operation of a timing circuit 86 which supplies an output signal at the end of the time interval required for the copy sheet to pass through the fuser station 76 under normal operating conditions.
  • a detecting station indicated generally as 88 at the outlet of the fuser station 74 supplies an inhibit signal to the output of the timing circuit 86 and thus prevents establishment of an alarm condition if the copy sheet 14 reaches the detecting station 88 in the expected time interval.
  • the timing and control circuit 86 disables the prior sheet feeding means and supplies an inhibit signal to the data signal source 12 to prevent further attempts to make copies until the jam in the machine between the detectors 74 and 88 has been cleared.
  • FIG. 3 of the drawings illustrates a novel sensing or detecting assembly 90 which permits the position of the copy sheet 14 to be photoelectrically sensed even though the sheets 14 are light sensitive. This is done by utilizing light responsive means and light sources that are operative in a spectrum other than that to which the light sensitive coating of the sheet 14, commonly zinc oxide, responds.
  • the assembly 90 includes a bifurcated bracket or support 92 having two arms 92A and 92B between which the copy sheet 14 is moved along its path of movement through the print-out machine 10.
  • the bracket 92 is suitably secured on a fixed supporting structure 94.
  • a photoelectric cell 96 is mounted on the arm 92B underlying the path of the movement of the sheet :14, and a light source or electric lamp 98 in a light-tight housing 99 is mounted on the arm 92A overlying the path of movement of the sheet 14.
  • One side of the filament of the lamp 98 is returned to the conductive support or bracket 92, and the other side of the filament is connected to a suitable source of potential through a spring terminal 100 carried on a dielectric member 102 secured to an upper surface of the arm 92A.
  • the spectrum of the light emitted by the source 98 is confined to a range of wavelengths outside of the range to which the coating on the sheet 14 responds. This can be done by selecting a lamp 98 that provides emission, for instance, in the infrared range which is beyond the response range of the coating for the copy sheet 14.
  • a filter element 104 can be mounted on the housing 99 interposed between the lamp and the copy sheet and photoelectric cell 96, which filter 104 passes only radiation in the in- 'frared range.
  • a suitable filter element 104 can comprise a Corning filter No. 2540 C57-56 manufactured by Corning Glass Co.
  • the photocell corresponding to the photocell 96 is illuminated by the light source 98 to be in its low impedance state except in the intervals in which the copy sheet 14 passes between the light source 98 and the photocell 96. During these intervals, the light responsive means or cell 96 is in its high impedance or low conductivity state.
  • the control circuit of the print-out machine illustrated in the schematic diagram in FIG. 1 is shown in logic block form and comprises conventional bistable circuits, monostable circuits, free running multivibrators, inverters or amplifiers, and AND gates.
  • This circuit also includes a number of trigger circuits, the logic symbol for which is shown in FIG. 2A, and a typical circuit for which is shown in FIG. 2B.
  • Two input terminals A and B are selectively connected to ground or a more positive potential in different combinations in dependence on the application of the logic device in the circuit and control the trigger to supply a negative-going pulse to an output terminal C when a predetermined combination of signals is applied to the input terminals A and B.
  • a capacitor 106 is charged to a positive potential in series with a resistance element 108. If the input terminal B remains at ground potential and the input terminal A is then returned to ground potential, a negative-going output pulse is supplied through a diode 110.
  • This negative-going signal is generally used in the circuit shown in FIG. 1 as an input signal for changing the state of bistable circuits or for triggering the operation of monostable circuits.
  • an AND gate 114 is connected through two amplifiers 116 and 118 to the input of a control relay 120. All of the inputs to the AND gate 114 are enabled when the three jam monitoring circuits or control circuits 42, 72, and ⁇ 86 are in a normal state. Thus, the amplifiers 116 and 118 are enabled to operate the control relay 120 so that the drive motor 58 is energized to rotate the rollers 54 and 56. The operation of the relay 120 also supplies an enabling potential to one input of an AND gate 122, the output of which is connected to the input of the controlled power supply circuit 28.
  • an AND circuit 124 is connected through two amplifiers or inverters 126 and 128 to a control relay 130.
  • the relay 130 controls the energization of the drive motor 68.
  • a thermal switch 132 associated with the fusing station 76 closes to apply ground to the resistive inputs of two trigger circuits 134 and 136.
  • the ground applied to the input of the trigger circuit 134 controls this circuit to supply a negative operating signal to a flip-flop or bistable circuit 138.
  • the other input to the AND gate is connected to the output of an AND gate 144.
  • the four inputs to the AND gate 144 are fully enabled when all of the monitoring or control circuits 40, 42, 72, and 86 are in a normal condition.
  • the gate 140 is fully enabled, and the amplifier 142 energizes the clutch 18 to couple the drive motor 20 to the rollers 22. This initiates rotation of the rollers 22 to feed a copy Sheet 14 toward the pair of rollers 30 at the inlet to the copy feeding means actuated by the drive motor 26.
  • the output of the AND gate 144 is also supplied to one input of an AND gate 146 to partially enable this gate.
  • the ground signal applied to the resistive input of the trigger circuit 136 by the closure of the thermal switch 132 controls the trigger 136 to forward a negative-going signal to a flip-Hop or bistable circuit 148 to set this circuit.
  • an inhibiting signal is applied to the lower input of an AND gate 150 including a diode 153 and a resistor 151, including a diode 157 and a resistor 155, and an enabling signal is applied to the upper input of an AND gate 152.
  • the other input to the AND gate 152 is connected to the output of a free-running multivibrator 154.
  • the output of the gate 152 is connected to one input of the AND gate 122.
  • the right-hand input of the gate 122 is enabled from the control relay 120, and the left-hand input of the gate 122 is supplied with enabling potential from the output of the skew detecting circuit 40.
  • the inhibiting potential supplied by the fiip-fiop 148 to the AND gate 150 controls the AND gate 150 to supply an enabling potential to another input of the AND gate 122.
  • a gate 122 is alternately enabled and inhibited so that the power supply circuit 28 intermittently energizes the motor 26 to intermittently rotate the plurality of pairs of drive rollers 30, 32, and 34, thereby providing intermittent or step-by-step movement of the copy sheet 14 as soon as it is fed between the nip of the rollers 30 by the rollers 22.
  • the detecting station 38 includes two sensing units 90 disposed along a line transverse to the direction of movement of the sheet 14.
  • Two light responsive means or photocells 156 and 158 in the two detecting assemblies 90 are illustrated in FIG. 1 of the drawings.
  • the photocell 156 is connected through two inverters or amplifiers 160 and 162 to a pair of diodes 164 and 166.
  • the photocell 158 is connected through a pair of inverters or amplifiers 168 and 170 to two diodes 172 and 174.
  • the diodes 166 and 172 form an OR gate for ground signals, the output of which -is connected to the capacitive input of a trigger 176.
  • the diodes 164 and 174 form an AND gate for ground signals, the output of which is connected to the input of an amplifier 178.
  • the output of the amplifier 178 is connected to the resistive input to a trigger circuit 180, and the output of the trigger circuit 176 is connected to the input of a monostable circuit 182.
  • one of the pairs of amplifiers 168, 170 or 160, 162 will ground the upper input of the trigged circuit 176 through one of the diodes 166 or 172.
  • the monostable circuit 182 times out, the upper input to the trigger 180 is returned to ground potential.
  • the trigger 180 will develop a negative-going output signal which will set an alarm ip-op 184.
  • the amplifier 178 and the AND gate including the diodes 164 and 174 hold the resistive input to the trigger 180 at a positive potential when the monostable circuit 182 times out to prevent the development of an output signal by the trigger 180 when the sheet 14 is in a proper position.
  • the AND gate including the diodes 164 and 174 and the amplifier 178 return the lower input of the trigger 180 to ground so that the trigger 180 sets the bistable circuit 184.
  • the gate including the diodes 164 and 174 is not completely enabled, and the amplifier 178 remains in a conductive condition so that ground is applied to the lower input of the trigger 180.
  • the flip-flop 184 is set.
  • a lamp amplifier 186 iS placed in a conductive condition to illuminate a lamp 188 and provide a visible indication that the copy sheet 14 has been fed in a skewed condition.
  • the Setting of the tiip-op 184 also forwards an inhibiting signal to one input of the AND gates 122 and 144 so that the drive motors 20 and 26 are no longer operative. Since control has not been transferred from the print-out unit to the data signal source 12, there is no possibility of losing image controlling signals when the copy sheet 14 is fed in a skewed condition. When the skewed sheet 14 has been removed from the machine or placed in a proper condition, the alarm indication can be removed and the print-out machine 10 returned to its normal condition by momentarily closing a reset switch 190 to apply ground to a reset terminal R. This terminal R is connected to the flip-flop 184 and to similar fiip-ops in the schematic circuit shown in FIG. l as indicated.
  • the AND gate connected to the input of the amplifier 178 is fully enabled, and the output of the amplifier 178 rises to a more positive potential which disables the trigger circuit 180.
  • the flip-op 184 remains in its normal condition.
  • the output of the amplier 178 remains at a more positive potential and forwards an enabling potential to the upper input of the AND gate 146. This completes the enabling of this gate, the output of which is connected to an input to the data signal source 12 through an amplifier 192.
  • the receipt of an output signal from an amplifier 192 advises the data signal source 12 that a copy sheet has been advanced to a ready position and that imaging operations or the transfer of data from the source 12 to the cathode ray tube 16 can be initiated on demand by the signal source 12.
  • the positive-going signal provided at the output of the amplifier 178 is also inverted in an amplifier 194 and applied to the capacitive input of a trigger 196, the output of which is connected to the flip-flop 148.
  • This signal controls the trigger 196 to reset the flip-op 148 to its normal condition so that the enabling potential supplies to the upper input of the AND gate 152 is removed.
  • the resetting of the flip-flop 148 also applies an enabling signal to the lower input of the AND gate so that this gate can now control energization of the drive motor 26 under the control of signals supplied by the data signal source 12.
  • the ground potential provided at the output of the amplifier 194 is also supplied to the input of a trigger circuit 198, the output of which is connected to the Hip-flop 138.
  • the output signal supplied by the trigger circuit 198 resets the dip-flop 138 and thus removes the enabling potential applied to one input of the gate 140. This releases the clutch 18 so that the motor 20 is no longer coupled to the drive rollers 22, and the feeding of additional copy sheets 14 from the supply thereof is interrupted. Further operation of the print-out unit 10 is controlled from the data signal source 12.
  • the signal source 12 can place the print-out machine 10 in operation whenever a copy is to be produced on the copy sheet 14 whose leading edge is disposed at the skew detecting station 38.
  • a remote or local source such as a record reader, communication link, or' central data processing unit
  • the data signal source forwards an enabling signal to the upper input of the AND gate 150 through an amplifier or inverter 200.
  • the output of the gate 150 completes the enabling of the gate 122 and controls the power supply circuit 28 to place the motor 26 in operation so that the drive system actuated by the motor 26 advances the copy sheet 14 through the corona charging station 24 to a position at which the leading edge of the copy sheet 14 is disposed in proximity to or in alignment with the face of the cathode ray tube 16.
  • the data signal source 12 supplies a series of signals to the cathode ray tube 16 representing the data to be recorded.
  • the light emitted from the face of the cathode ray tube 16 selectively discharges the uniformly charged surface of the sheet 14 to produce an electrostatic image.
  • the data signal source 12 selectively supplies inhibiting and enabling signals through the amplifier 200 to the gate 150 so that the AND gate 122 and the power supply 28 are controlled to intermittently operate the drive motor 26. If the nature of the signal supplied to the tube 16 is such as to permit continuous operation, the power supply 28 can be controlled by the AND gate 122 to provide con tinuous operation of the motor 26 during the signal receiving interval.
  • both of the photocells 156 and 158 are again fully illuminated.
  • This ground potential applies an inhibit to one output of the gate 146 and controls the amplifier 194 to prepare the trigger circuits 196 and 198 for a subsequent operation.
  • the source 12 is given an indication not'to place a subsequent or second print order until the successful completion of the first order at which time a second sheet will be advanced by rollers 22 to station 38.
  • the illumination of a photocell or light responsive means 202 in a sensing assembly similar to the assembly 90 is terminated, and three series connected amplifiers 204, 206, and 208 connected to the capacitive input of a trigger circuit 210 connect this capacitor to a more positive potential to initiate the charging of this capacitor.
  • the trigger 210 does not produce an output at this time.
  • the drive system actuated by the motor 26 further advances the copy sheet 14 so that the leading edge thereof is received in the nip of the continuously operated rollers 54 driven by the motor 58.
  • the space between the rollers 34 and 54 is equal to the length of a copy sheet 14 so that the copy sheet is not torn or damaged when the leading portion thereof is subjected to the continuous drive imparted by the rollers 54.
  • the rollers 54 and 56 as well as 30, 32 and 34 could all be initially operated intermittently, and then be switched by means of a clutch to a continuous mode of operation when the trailin-g edge of the sheet cleared station 62.
  • the leading edge of the copy sheet is received between the rollers 54, it is quickly advanced by these rollers and the rollers 56 to a position in which the leading edge of the copy sheet intercepts the ⁇ beam of light normally falling on a photocell 212 at the detecting station 60, the photocell 212 being a part of a sensing or detecting assembly similar to the assembly 90.
  • the arrival of the leading edge of the sheet 14 at the station 60 indicates the satisfactory movement of the copy sheet through the charging station 24 and the exposing station 36.
  • the trigger circuit 210 supplies a negative-going pulse to the flipflop 148 so that this liip-op is again set to apply an inhibiting potential to the lower input of the AND gate 150 and thus prevent further control over the power supply 28 by the data signal source 12.
  • the setting of the ip flop 148 enables the upper input of the AND gate 152 so that the power supply 28 is periodically driven by the multivibrator 154 to permit a sheet fed by the rollers 22 to be advanced to the skew detecting station 38.
  • the sheet feeding assembly including the rollers 22 is selectively placed in operation in dependence on the satisfactory arrival of the copy sheet 14 at the detecting station 60.
  • the illumination of the photocell or light responsive means 212 is terminated, and a pair of amplifiers or inverters 213 and 214 remove positive potential from the capacitive input to a trigger circuit 216 and apply ground potential thereto.
  • an enabling potential is returned to one input of the AND gate 140, and this AND gate causes the energization of the clutch 18 so that the motor 20 again advances a copy sheet 14 from a stack thereof toward the rollers 30 by rotation of the rollers 22.
  • the pulse generator including the photocell 52 provides a series of pulses representing the increments of movement applied to the copy sheet 14 by the operation of the motor 26, and these pulses are used to control the operation of the monitoring or control circuit 42 which provides an indication of whether the copy sheet 14 has properly passed from the skew detecting station 38 to the detecting station 60.
  • the signal souce 12 supplies a signal through a pair of amplifiers 218 and 220 to a trigger circuit 222 which signal controls the trigger circuit 222 to supply a setting signal to a flip-dop or bistable circuit 224.
  • This signal sets the ip-op 224 so that ground potential is applied to the resistive input of a trigger circuit 226.
  • the capacitive input of the trigger circuit 226 is connected to the photocell 222 through a pair of amplifiers 228 and 230.
  • the output of the trigger circuit 226 is connected to the input of a binary counter 232 of conventional construction.
  • the photocell 52 supplies a series of pulses repre senting increments of movement of the copy sheet 14 which are applied to the input of the counter 232 and serve to advance this counter to successive settings representing the sum of the increments of movement.
  • the binary counter is set to provide an output signal when a predetermined number of increments of move ment have been imparted to the copy sheet 14 by the drive system actuated by the motor 26.
  • This sum of increments of movement is equal to the movement required to move the copy sheet from a position in which the leading edge is at the skew detecting station 38 to one in which the trailing edge of the copy sheet 14 leaves the rollers 34, the sheet thereafter being continuously advanced by the motor 58 to the point at which the leading edge intercepts the beam of light at the detecting station 60.
  • the binary counter 232 has received input signals representing this length of movement, the counter 232 provides an output signal which is forwarded through an amplifier 234 to ground the capacitive input of a trigger circuit 236.
  • the trigger circuit 236 will set an alarm Hip-flop 238 if the leading edge of the copy sheet 14 has not reached the detecting station 60 at this time.
  • the resistive input of the trigger 236 is connected to the output of the amplifier 214 through an amplifier 240. If the leading edge of the copy sheet 14 does not reach the station 60 at the time that the capacitive input to the gate 236 is dropped to ground potential by the amplifier 234, the amplifier 240 holds the resistive input to the trigger 236 at ground potential, and the fiipfiop is set to apply an inhibit signal to the gates 144 and 114 and, through the gate 114, to the gate 122. Thus, additional copy sheets can not be fed from the supply thereof to the skew detecting station 38, and the drives powered by the motors 26 and 58 are disabled. The inhibit placed on the gate 144 also inhibits the gate 146 to prevent transfer of control to the data source 12.
  • the setting of the flip-flop 238 places a lamp amplifier 242 in conduction to illuminate a lamp 244.
  • the illumination of the lamp 244 provides a visible indication that the copy sheet 14 has not been properly fed from the skew detecting station 38 to the detecting station 60.
  • the Hip-flop 238 is reset by momentarily closing the switch 190. If the leading edge of the copy sheet has reached the detecting station 60 at the proper time, the output of the amplifier 240 is at a more positive potential, and the vtrigger circuit 236 is inhibited so that the fiipflop 238 can not be set.
  • the ground signal provided at the output of the inverter 234 is also returned to the binary counter 232 through an amplifier 246 to reset the counter 232 to a normal condition.
  • the ground signal provided at the output of the ampli-fier 234 is also supplied to the capacitive input of a trigger circuit 248 to control the circuit to supply an output signal for resetting the flip-flop 224 to its normal condition.
  • an inhibiting signal is supplied to the lower input to the trigger circuit 226 to prevent the application of further input signals to the binary counter 232.
  • the leading edge of the copy sheet 14 next passes through the rollers 64 to the developing station 70k at which the latent electrostatic image produced by the tube 16 is developed, as by a magnetic brush developer.
  • the copy sheet 14 is driven through the developing station 70 by the rollers 64 and 66 actuated by the drive motor 68 so that the leading edge of the copy sheet 14, on passing beyond the rollers 66, intercepts the beam of light normally impinging on a photocell 250 in a detecting assembly similar to the assembly 90 at the detecting station 74.
  • the interception of the beam of light normally impinging on the photocell or light responsive means 250 indicates that the copy sheet 14 has passed through the developer station 70.
  • the timing circuit 72 is provided for monitoring the passage of the copy sheet 14 through the developer station 70 and provides an indication if the sheet is not moved through the station 70 in the set time period of the program. Since the copy sheet 14 is of a known length and is continuously moved from the detecting station 60 to the detecting station 74, the proper passage of the copy sheet 14 through the developer station can be determined by measuring the time required for this passage. Accordingly, the timing circuit 72 includes two monostable timing circuits 252 and 254 providing a time delay equal to the expected transit of time of the copy sheet 14 between the stations 60 and 74.
  • the circuit 72 is placed in operation when the leading edge of the copy sheet 14 intercepts the beam of light at the detecting station 60 and controls the amplifier 214 to supply a ground signal to the upper input of a trigger circuit 256.
  • ground is applied to the capacitive input of the trigger circuit 258 to control this circuit to set the monostable circuit 254.
  • the monostable circuit 254 provides a positive potential to the capacitive input of a trigger circuit 260 during its timing interval and return this capacitive input to ground potential at the end of its time delay.
  • the resistive input of the trigger circuit 260 is connected to the photocell 250 through three series connected inverters or amplifiers 264, 266, and 268. If the leading edge of the copy sheet 14 has reached the detecting station 74, the amplifier 268 holds the resistive input of the trigger circuit 260 at a positive potential when ground is applied to the capacitive input by the monostable circuit 254. Thus, the flip-fiop 262 cannot be set. Alternatively, if the copy sheet 14 has failed to reach the detecting station 74, the amplifier 268 holds the resistive input of the trigger circuit 260 at ground potential, and the flip-flop 262 is set.
  • a lamp amplifier 270 is placed in a conductive condition to illuminate a lamp 272 and provide a visible indication that the copy sheet 14 has not been properly advanced from the detecting station 60 to the detecting station 74.
  • the setting of the fiipfiop 262 also applies an inhibiting potential to the gates 114, 124, and 144, and, through the gate 114, to the gate 122.
  • the inhibit placed on the gate 144 also disables transfer of control to the data source 12 through the gate 146.
  • the copy sheet 14 As the copy sheet 14 passes through the detecting station 74, it enters the fusing station 76 through which it is advanced by the rollers 80 and 82 and the conveying belt 78 driven by the motor 84. When the trailing edge of the sheet passes the detecting station 74, the amplifiers, 264, 266, and 268 are restored to their normal condition. As the copy sheet 14 leaves the fusing station 76, it intercepts the beam of light normally illuminating a photocell or light responsive means 274 at the detecting station 88, the detecting station being substantially the same as the detecting assembly shown in FIG. 3.
  • the satisfactory passage of the copy sheet 14 between the detecting stations 74 and 88 can be determined by measuring the length of time elapsed between the interception of the beam of light at the detecting station 74 and the interception of the beam of light at the detecting station 88.
  • the timing circuit 86 which monitors the passage of the copy sheet 14 through the fusing station 76 includes three monostable timing circuits 276, 278, and 280, the first of which is coupled to the output of the amplifier 266 through a trigger circuit 282.
  • the photocell 250 detects the presence of the leading edge of the copy sheet 14
  • ground is applied to capacitive input of the trigger circuit 282 so that the trigger circuit 282 sets the monostable circuit 276.
  • the monostable circuit 276 provides a positive-going pulse of a given time duration, at the termination of which a trigger circuit 284 coupled to the output of the monostable circuit 276 sets a monostable 278.
  • a trigger circuit 286 coupled to the circuit 278 sets the monostable circuit 280.
  • the output of the monostable circuit 280 is connected to the capacitive input of a trigger circuit 288, the output of which is connected to an alarm flip-Hop 290.
  • the resistive input of the trigger circuit 288 is connected to the photocell 274 through three series connected inverters or amplifiers 292, 294, and 296. If the leading edge of the copy sheet 14 intercepts the beam of light at the detecting station 88 at the time that the monostable 280 times out, a positive inhibiting potential is applied to the resistive input of the trigger circuit 288, and the control circuit for the print-out machine 10 remains in its normal state.
  • the amplifier 296 applies ground to the resistive input of the trigger circuit 288, and this circuit sets the flip-flop 290.
  • a lamp amplifier 298 is placed in a conductive condition to illuminate a lamp 300 and pro- -vide a visible indication of the improper sheet feeding in the fusing station 76.
  • the setting of the fiip-op 290 also applies an inhibit signal to the AND gates 124, 144, and 114, and, through the gate 114, to the AND gate 122.
  • a photoelectrostatic print-out machine of the type that receives a copy order from a remote source, said order being presented in the form of intermittent data signals which are used to image a light sensitive copy sheet, the combination comprising a charging station;
  • an exposure station receiving the intermittent data signals and converting said data signals into a light image which is cast upon the copy sheet to expose said sheet;
  • transport means for moving the sheet along a predeter-mined path past said exposure station in response tothe receipt of said data signals at said exposure station;
  • Sensing means at a predetermined point along said path beyond said exposure station which detect the arrival of said sheet at said point as said sheet is moved along said path;
  • Control means including means for effectively counting said data signals coupled to said sensing means and actuated on the failure of said sensing means to detect the sheet moving past said point at such time as is indicated by said counting means, for providing a control signal;
  • control means coupled to said control means and actuated by said control signal for preventing the transfer of data signals to the machine when the machine is not in a condition to receive a copy order.
  • control means includes means for arresting the operation of the transport means when said data signals cease.
  • a photoelectrostatic print-out machine as claimed in claim 4 further including second transport means operated to move said copy sheet past said developing station downstream from said exposure station along said path, said second transport means being controlled by said print-out machine and becoming operative only after said copy sheet successively reaches said predetermined point.
  • a photoelectrostatic print-out machine of the type that receives a copy order from a remote source, said order being presented in the form of electrical data signals which are used to image a light sensitive copy sheet, the combination comprising a charging station for charging a copy sheet;
  • an exposure station supplied with the data signals and converting said signals into a light image which is cast upon the charged copy sheet to expose said sheet;
  • a developing station for developing the imaged copy sheet
  • transport means for moving the sheet along a predetermined path sequentially past said charging, exposure, and developing stations;
  • said monitoring means including:
  • sensing means disposed at the second point which provides a -monitoring signal when the sheet arrives at said second point
  • a pulse responsive counter coupled to the pulse generator and operative on receiving a number of pulses corresponding to said predetermined number of units, to provide a counting signal
  • comparator means coupled to the sensing means and the counter and responsive to said counting and monitoring signal to provide a control signal whenever said counting signal is received by said comparator means before said monitoring signal is received;
  • an exposure station supplied with thedata signals and converting said signals into a light image that exposes the charged copy sheet
  • a dleveloping station for developing the exposed copy s eet
  • transport means for moving the sheet along a predetermined path sequentially past said stations
  • first and second sensing means disposed along a common line transverse to the direction in which said sheet is moved by said transport means so that during normal movement the lead edge of the sheet reaches both sensing means simultaneously, each of said sensing means providing a monitoring signal upon the arrival of the sheet;
  • comparator means coupled to the sensing means and responsive to the monitoring signals from said sensing means to provide a control signal indicating an abnormal skew condition unless said monitoring signals are received simultaneously;
  • a photoelectrostatic print-out machine of the type that receives data signals from a signal source which are used to image a copy sheet that is sensitive to radiation of a given range of wavelengths, the combination comprising:
  • an exposure station for directing a light image in said given range of wavelengths onto a charged copy sheet to expose said sheet
  • a developing station for developing the exposed sheet
  • photoelectric sensing apparatus at a predetermined point along said path which detects the arrival of the sheet at said point as said sheet is moved along said path, said photoelectric sensing apparatus including a light source disposed on one side of said path which emits a beam of light consisting of radiation outside of said given range and to which said copy sheet is insensitive, and a photoresponsive device to the radiation emitted from said light source, positioned on the other side of said path opposite said source so that said light beam strikes said photoresponsive device after passing through said path;
  • control means electrically coupled to said photoresponsive means and responsive to the interruption of the beam of light by said copy sheet for detecting the sheet moving past said point in accordance with said program, said control means providing a control signal upon detection of the failure of said copy sheet to move along said path in accordance with said program;
  • inhibitor means responsive to said control signal for preventing the further transfer of data signals to the machine.
  • a print-out machine that receives from a signal source a copy order in the form of data signals which are used to image a light sensitive copy sheet, comprising an exposure station which receives the data signals and converts them into a light image that is cast upon a copy sheet at said station, transport means controlled by said signal source for moving the sheet in accordance with the receipt of said data signals at said exposure station, along a path past said station, means along Said path for monitoring the movement of the sheet and, upon detecting the sheet to fail to move in accordance with the receipt of said data signals, for providing a control signal to prevent further operation of said transport means and to prevent the further transmission of data signals to said machine.
  • a photoelectrostatic print-out machine of the type that receives a copy order from a remote location, said order being presented in the form of electrical data signals used to image a light-sensitive copy sheet
  • the combination comprising a data signal source for supplying the data signals; a charging station for applying an electrostatic charge to the copy sheet; an exposure station coupled to the signal source and supplied with data signals to expose the copy sheet to form a latent image thereon; a developing station for developing the latent image; transport means for moving the sheet along a predetermined path sequentially past said charging, exposure and developer stations; rst and second sensing means spaced apart at predetermined points along said path to detect the arrival of the sheets at said points; timing means including first and second monostable circuits each having an input and an output, and trigger circuit means including a plurality of inputs and an output, the input of said first monostable circuit being connected to said first sensing means, and the output being connected to the input of said second monostable circuit, the output of said second monostable circuit being connected
  • control means is further operable in response to the appearance of a signal at the output of said trigger circuit means, to arrest the operation of said transport means in advance of said second sensing means, thereby to prevent the movement of additional copy sheets along said predetermined path.
  • a print-out machine that receives from a signal source a copy order in the form of intelligence signalsV including data signals used to image a light sensitive copy, sheet, comprising:
  • an exposure station which receives the data signals and converts them into a light image that is cast upon a copy sheet at said station; transport means controlled by said intelligence signals for moving the sheet into position with respect to said exposure station whereat a predetermined number of data signals is received from said source for imaging said copy sheet, said transport means -being opera-ble to move said copy sheet in a direction out and away from said exposure station upon completion of the receipt of said data signals at said lastmentioned station; and means for monitoring the movement of said copy sheet and upon detecting the failure of the sheet to move in said direction out and away from said exposure References Cited UNITED STATES PATENTS 2/ 1949 Schubert.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Control Or Security For Electrophotography (AREA)
US617094A 1967-02-20 1967-02-20 Photoelectrostatic print-out machine Expired - Lifetime US3501236A (en)

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US61709467A 1967-02-20 1967-02-20

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US (1) US3501236A (fr)
JP (1) JPS509306B1 (fr)
BE (1) BE710135A (fr)
DE (2) DE1786558A1 (fr)
GB (1) GB1204061A (fr)
NL (1) NL6801943A (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655282A (en) * 1969-12-31 1972-04-11 Addressograph Multigraph High speed photoelectrostatic copying machine
US3655283A (en) * 1969-12-31 1972-04-11 Addressograph Multigraph High speed photoelectrostatic copying machine
US3663102A (en) * 1969-12-31 1972-05-16 Addressograph Multigraph High speed photoelectrostatic copying machine
US3690760A (en) * 1971-04-05 1972-09-12 Ibm Electrostatic printing system
JPS4879643A (fr) * 1972-01-25 1973-10-25
US3784297A (en) * 1970-03-11 1974-01-08 Canon Kk Photocopying machine
US3790271A (en) * 1972-08-30 1974-02-05 Xerox Corp Processing control system for printing machines
US3790270A (en) * 1972-08-30 1974-02-05 Xerox Corp Registration reset system
JPS4979247U (fr) * 1972-10-24 1974-07-09
US4002409A (en) * 1975-04-01 1977-01-11 Xerox Corporation Chain feed control logic for a multi-mode copier/duplicator
JPS5496041A (en) * 1978-07-07 1979-07-30 Canon Inc Safety device
JPS5577750A (en) * 1978-12-08 1980-06-11 Copyer Co Ltd Operation-state display device of copying machine
JPS561630Y1 (fr) * 1974-03-25 1981-01-14
JPS5630144A (en) * 1979-08-21 1981-03-26 Konishiroku Photo Ind Co Ltd Abnormality detector in copying machine or the like
JPS60166964A (ja) * 1984-07-12 1985-08-30 Canon Inc 画像形成装置
WO1991006069A2 (fr) * 1989-10-10 1991-05-02 Unisys Corporation Module de codage automatise tres rapide
US20110047403A1 (en) * 2009-08-20 2011-02-24 Canon Kabushiki Kaisha Image forming apparatus
CN114379229A (zh) * 2020-10-21 2022-04-22 精工爱普生株式会社 驱动传递装置及液体喷出装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4384202A (en) * 1980-12-11 1983-05-17 Burroughs Corporation Track controller for a document processor
JPS629205A (ja) * 1985-07-05 1987-01-17 Mita Ind Co Ltd 原稿サイズ検知装置

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US2461185A (en) * 1943-01-08 1949-02-08 Eastman Kodak Co Record handling and copying apparatus
US3150873A (en) * 1962-03-29 1964-09-29 Burroughs Corp Item jam detection apparatus
US3168857A (en) * 1961-05-01 1965-02-09 Rca Corp Electrostatic printing
US3181420A (en) * 1963-05-23 1965-05-04 American Photocopy Equip Co Copying machine
US3322261A (en) * 1966-02-14 1967-05-30 Monroe Int Article sensing apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461185A (en) * 1943-01-08 1949-02-08 Eastman Kodak Co Record handling and copying apparatus
US3168857A (en) * 1961-05-01 1965-02-09 Rca Corp Electrostatic printing
US3150873A (en) * 1962-03-29 1964-09-29 Burroughs Corp Item jam detection apparatus
US3181420A (en) * 1963-05-23 1965-05-04 American Photocopy Equip Co Copying machine
US3322261A (en) * 1966-02-14 1967-05-30 Monroe Int Article sensing apparatus

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655283A (en) * 1969-12-31 1972-04-11 Addressograph Multigraph High speed photoelectrostatic copying machine
US3663102A (en) * 1969-12-31 1972-05-16 Addressograph Multigraph High speed photoelectrostatic copying machine
US3655282A (en) * 1969-12-31 1972-04-11 Addressograph Multigraph High speed photoelectrostatic copying machine
US3784297A (en) * 1970-03-11 1974-01-08 Canon Kk Photocopying machine
US3690760A (en) * 1971-04-05 1972-09-12 Ibm Electrostatic printing system
JPS5341532B2 (fr) * 1972-01-25 1978-11-04
JPS4879643A (fr) * 1972-01-25 1973-10-25
US3790271A (en) * 1972-08-30 1974-02-05 Xerox Corp Processing control system for printing machines
US3790270A (en) * 1972-08-30 1974-02-05 Xerox Corp Registration reset system
JPS4979247U (fr) * 1972-10-24 1974-07-09
JPS5326984Y2 (fr) * 1972-10-24 1978-07-08
JPS561630Y1 (fr) * 1974-03-25 1981-01-14
US4002409A (en) * 1975-04-01 1977-01-11 Xerox Corporation Chain feed control logic for a multi-mode copier/duplicator
JPS5496041A (en) * 1978-07-07 1979-07-30 Canon Inc Safety device
JPS567232B2 (fr) * 1978-07-07 1981-02-17
JPS5577750A (en) * 1978-12-08 1980-06-11 Copyer Co Ltd Operation-state display device of copying machine
JPS5630144A (en) * 1979-08-21 1981-03-26 Konishiroku Photo Ind Co Ltd Abnormality detector in copying machine or the like
JPS60166964A (ja) * 1984-07-12 1985-08-30 Canon Inc 画像形成装置
JPS6329260B2 (fr) * 1984-07-12 1988-06-13 Canon Kk
WO1991006069A2 (fr) * 1989-10-10 1991-05-02 Unisys Corporation Module de codage automatise tres rapide
WO1991006069A3 (fr) * 1989-10-10 1991-08-22 Unisys Corp Module de codage automatise tres rapide
US20110047403A1 (en) * 2009-08-20 2011-02-24 Canon Kabushiki Kaisha Image forming apparatus
US8615675B2 (en) * 2009-08-20 2013-12-24 Canon Kabushiki Kaisha Image forming apparatus
CN114379229A (zh) * 2020-10-21 2022-04-22 精工爱普生株式会社 驱动传递装置及液体喷出装置
CN114379229B (zh) * 2020-10-21 2023-11-14 精工爱普生株式会社 驱动传递装置及液体喷出装置

Also Published As

Publication number Publication date
DE1613972A1 (de) 1971-04-29
DE1613972B2 (de) 1973-07-05
GB1204061A (en) 1970-09-03
NL6801943A (fr) 1968-08-21
DE1786558A1 (de) 1974-02-28
JPS509306B1 (fr) 1975-04-11
BE710135A (fr) 1968-05-30

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