US3588472A - Logic control apparatus - Google Patents

Logic control apparatus Download PDF

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Publication number
US3588472A
US3588472A US595388A US3588472DA US3588472A US 3588472 A US3588472 A US 3588472A US 595388 A US595388 A US 595388A US 3588472D A US3588472D A US 3588472DA US 3588472 A US3588472 A US 3588472A
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Prior art keywords
counter
transport path
count
jam
coincidence
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US595388A
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English (en)
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Thomas H Glaster
Thomas W Hess
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Xerox Corp
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Xerox Corp
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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
    • 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
    • G03G21/02—Counting the number of copies; Billing

Definitions

  • a TTORNEV LOGIC CONTROL APPARATUS This invention relates to copying apparatus and, more particularly, to improved xerographic reproducing apparatus for fanfold computer form type documents.
  • a number of record sheets may be in the transport path which includes the sheet feeding apparatus for delivering the record sheet from the input stack or paper supply through the transfer fixing stages to the output station.
  • the sheet feeding apparatus for delivering the record sheet from the input stack or paper supply through the transfer fixing stages to the output station.
  • FIG. 1 represents a reproducing apparatus in which the present invention may be incorporated
  • FIG. 2 represents a partial block diagram of the overall control module which may be utilized in the reproducing apparatus as shown in FIG. I;
  • FIG. 3 represents a block diagram of the control and indicating circuit in accordance with the principles of the present invention.
  • a reproducing apparatus is illustrated and generally designated by the reference numeral 2. From left to right, as illustrated, the reproducing apparatus includes a sorter apparatus 4, a control module 6, and an exposure and development module 8.
  • Original documents which may be in a fanfold form are sprocket-fed from an original document bin (not shown) across an exposure platen in the exposure and development module 8. As the original documents egress from the exposure and development module 8, they may be collected in a collecting bin (not shown). Simultaneously with the feeding of original documents ina direction from left to right, as seen in FIG. 1, record sheets are supplied from a suitably positioned record sheet supply bin (not shown) to the exposure and development module to accept transfer of toner images corresponding to the original document desired to be copied. These transferred toner images are then fused and fixed.
  • the exposure and development module 8 may be of any suitable design.
  • the control module will be referred to in more detail in regard to FIG. 2.
  • the sorter apparatus 4 may include mechanical copy deflectors utilized to orderly distribute the copies as they come from the exposure and development module and to arrange these copies in sets in the same sequence as the original documents were exposed.
  • FIG. 1 has been referred to generally in order to provide the environment in which the present invention may be found useful.
  • the particular modules indicated as comprising the reproducing apparatus 2 of FIG. I do not in themselves constitute part of the present invention.
  • a control panel 10 includes a keyboard 12 for purposes of manual entry into the control module to provide the necessary information to the various control circuits.
  • the desired numbers of copies to be made and sorted are encoded from their original decimal form into binary information by a conventional decimal-to-binary encoder (D/B) 14.
  • D/B decimal-to-binary encoder
  • the information entered via the keyboard is placed either in a copy memory 16 or a sort memory 18.
  • the numbers entered via the keyboard into the copy and sort memories may be different depending upon the amount of sorted copies desired.
  • Motor control logic circuitry generally designated by the reference numeral 24 is also shown in FIG. 2 as deriving information from the keyboard and control panel. These circuits which form no part of the present invention may be utilized to initiate motive forces within the exposure and development module 8, the sorter apparatus 4, and various other feeding mechanisms in the reproducing apparatus 2 shown in FIG. 1.
  • the sorter control circuit generally designated by the reference numeral 26 also receives the number stored in the sort memory to control the sorting operation.
  • FIG. 3 represents a preferred embodiment of the present invention.
  • record sheets are fed into the exposure and development module 8 and then proceed in the form of copies to a sorter apparatus 4.
  • This portion of the reproducing apparatus is shown symbolically in FIG. 3 where the record sheet supply bin 28 and the sorter apparatus 4 are illustrated in block form and intermediate therewith is a broken line 30 used to generally designate the transport path taken by a record sheet and as itproceeds from its supply bin 28 to the sorter apparatus 4.
  • copy used as a noun will refer to a completed facsimile of an original document which will be found in the reproducing apparatus of FIG. 1 immediately prior to entry into the sorter apparatus.
  • the copy has on its surface a fused and fixed toner image of an original document and is suitable for handling by personnel and further utilization. All other record sheets along the transport path, as illustrated in FIG. 3, will be referred to simply as record sheets. It is understood that these sheets may be simply ordinary sheets of paper, or they may have transferred toner fingers may take the form of a light source and photocell, a
  • the mechanical finger 32 is utilized to detect each record sheet as it enters the transport path 30.
  • the next three mechanical fingers 34 for example, in successive sequence along the transport path toward the sorter apparatus 4 are utilized to provide three inputs in the form of electrical signals to a jam detector circuit, generally designated by the reference numeral 36.
  • a jam detector circuit generally designated by the reference numeral 36.
  • another mechanical finger 40 which detects copies as they egress from the transport path 30 for further manipulation by the sorter apparatus 4.
  • a terminal 42 To this terminal 42 there may be applied pulses, each pulse indicative of a sheet being supplied from the record sheet bin 28 to the transport path via, for example, rollers 44. Such pulses could be generated by suitable sensing means positioned immediately prior to entry into the transport path.
  • the jarn detector circuit 36 may comprise as many conventional AND gates as there are sensors 34 for detecting coincidence between the actuation of a particular sensor 34 and the expiration of a predetermined time interval.
  • a timer either of conventional electronic or mechanical design may be as sociated with a sensor or finger 34 so as to be actuated thereby when the latter detects a record sheet at a particular location in the transport path 30.
  • these timers are designed as a function of the speed of the record sheets along the transport path and the distance between the mechanical fingers 34.
  • a first record sheet initiates a pulse at terminal 42 which pulse will, for example, actuate a relay to begin a timer.
  • a pulse is generated thereby which should substantially coincide in time with a similar pulse generated by the aforementioned first record sheet actuating thefirst mechanical finger 34. If this coincidence is not present, then a jam condition is sensed by the jam detector 36 since this first record sheet did not proceed normally along the transport path.
  • the actuation of the first finger can further be utilized to begin a second timer and thiscycle of operation can be repeated for each mechanical finger 34.
  • a particular time tolerance may be provided in the aforementioned timers to insure that a false jam detection signal is not generated because of a very minimum delay in a record sheet moving along the transport path. In this manner, exact and precise timing is not a prerequisite for accurate jam detection. Because of the machine timing, the speed of the transport path and the selected positions of the mechanical fingers along this path, the above described technique for detecting some type of record sheet feeding malfunction or abnormal condition is very effective.
  • the jam detecting circuit will detect a failure of the record sheets to proceed orderly along the transport path between the record sheet supply bin 28 and the sorter apparatus 4. If a malfunction in this process occurs, the jam detecting circuit will detect the same and generate an electrical signal at its output which, as shown in FIG. 3, is supplied as one input to AND gates 48 and 50.
  • the first mechanical finger 32 which detects a record sheet as it enters the transport path supplies a pulse to a record sheet counter 52 which may be of any conventional design.
  • the mechanical finger 40 which detects each copy as it egresses from the transport path and into the sorter apparatus 4, provides a pulse for each copy detected to a copy counter 54 which may be of similar design as the record sheet counter 52.
  • the contents of the record sheet counter 52 and the copy counter 54 are monitored by conventional coincidence detectors 56 and 58, respectively. These coincidence detectors 56 and 58 monitor the number present in the record sheet counter 52 and the copy counter 54 in relation to a number stored in the copy memory 16 which may be a conventional binary register.
  • the input to this copy memory 16 is directly from the aforementioned keyboard 12 which is found in the control panel 10 in the control module 6 of the reproducing apparatus of FIG. 1.
  • the coincidence detector 56 detects a coincidence in the number registered in the record sheet counter 52 and the number stored in the copy memory 16, an output signal indicative of this comparison is generated and supplied to one input to a conventional reversible counter 60. This signal registers a count in this reversible counter 60 in one direction.
  • the coincidence detector 58 detects a coincidence between the number registered in the copy counter 54 and the number stored in the copy memory 16, an output signal is generated indicative of this coincidence and this signal is supplied to another input of the reversible counter 60 to register a count in a direction opposite the aforementioned direction.
  • the output of this reversible counter is monitored by the AND gate 48 which, upon enabling by a signal from the jam detecting circuit 36 hereinabove described, will pass the count registered in the reversible counter via a binary-todecimal (BID) encoder 68 to a suitable display device 20.
  • BID binary-todecimal
  • coincidence signals generated by coincidence detectors 56 and 58 are further utilized to reset the record sheet counter 52 and the copy counter 54, respectively.
  • the coincidence signal generated by the coincidence detector 56 which monitors the record sheet counter 52 may be also used as a control signal to an appropriate control circuit which is designated in FIG. 3 as an original advance circuit 62. This circuit will actuate the necessary motors and gears to advance the next original document to be copied into an exposure zone at the exposure and development module 8 of the reproducing apparatus 2 of FIG. I.
  • the signal from the jam detecting circuit 36 also enables one input of the AND gate 50.
  • the other input of this AND gate is supplied from a jam restart control circuit 64 which may be included to reenergize the motor portion of the reproducing apparatus of FIG. 1 after a shut down subsequent to a jam detection.
  • the output from this AND gate 50 which is enabled when a jam situation has occurred and the jam restart control circuit is activated, provides a transfer or equalizing signal to an appropriate transfer circuit 66 which, in effect, equalizes the count then presently registered at the time of the jam in the record sheet counter to that count registered in the copy counter 54.
  • the record sheet counter 52 is counting, in effect, the number of copies which are possible only if a jam does not occur.
  • the copy counter meanwhile is counting the number of copies which have been retrieved from the exposure and development module as completed.
  • a count is entered in the reversible counter 60 in one direction, for example, up. If all goes well and no jam or record sheet feed malfunction occurs before these sheets become copies, the copy counter 54 will register a count identical to the count stored in the copy memory 16. This will generate a pulse from the coincidence detector 58 which will enter a count in the reversible counter 60 in the down direction.
  • the count in the reversible counter 60 is reduced or counted down once to zero. This operation of entering a one count in counter 60 in the up direction and then reducing or counting this counter down by one count occurs in the simple case when the number desired copies per original document is greater than the number of record sheets which the transport path 30 can accommodate.
  • the first copy of the first original document enters a one count in counter 54. Substantially simultaneously with the egress of this first copy, the eighth record sheet enters the transport path. Shortly thereafter a second copy of the first original document enters the sorter apparatus 4 and increases the count in counter 54 to two. The ninth record sheet then enters the transport path increasing the count in counter 52 to three which in turn provides a coincidence with the number in copy memory 16 thereby adding a count to the reversible counter 60. This coincidence also allows the fourth original document to advance to the exposure position.
  • counter 54 has its count increased to three. This three count coincides with the contents of the copy memory 16 and coincidence detector provides an output pulse which reduces the three count previously registered in the reversible counter 60 to two. This output pulse from the coincidence detector 58 also resets the copy counter 54 to zero.
  • the tenth record sheet enters the transport path and registers a one count in the record sheet counter 52.
  • the first copy of the second original exists from the transport path thereby entering a one count in counter 54.
  • Counter 52 has detected the entry into the transport path of the eleventh record sheet.
  • This backing up of the original documents may, for example, be performed by a suitable original backup control circuit 70 which actuates the original advance control circuit 62 in a reverse mode or may be done manually.
  • a control signal from this backup control circuit 70 may be utilized to reset the reversible counter 60 to zero.
  • the operator may also remove all seven record sheets in the transport path and clear the jam wherever it may be. Without counting the number of damaged or partially processed record sheets which were removed from the transport path, the operator may now simply actuate a jam restart switch, for example, which actuates the jam restart circuit 64. When this is done, the machine is reactivated and the contents or the number stored in the copy counter 54, one in the example, is transferred via the now energized transfer circuit 66 to the record sheet counter 52. After this transfer, the record sheet counter now has stored in it the number which the copy counter 54 had registered before the jam occurred, viz., one. The machine then begins its cycle once again and the twelfth and thirteenth record sheets successively enter the transport path 30.
  • a jam restart switch for example, which actuates the jam restart circuit 64.
  • the record sheet counter indicates a three count which provides a coincidence pulse to the reversible counter 60 which steps up this counter one to a three count.
  • the second original document advances presenting the third original document.
  • the copy counter which has now counted the first copy of the second original document as received prior to the jam, will now detect the remaining two copies of the second original document and provide a coincidence signal which steps the reversible counter down one count to one. As this is being done, more sheets may successively enter the transport path stepping the reversible counter up. If these are received as copies in the sorter apparatus, a coincidence signal from the coincidence detector 58 will step the reversible counter down. This cycle will then repeat itself for as many original documents and copies as desired.
  • the counter 60 would react as follows: every third record sheet detected by sensor 32 would add one to the counter 60, while every third copy detected by sensor 40 would subtract one from the count of the counter 60. Therefore, the count in the counter 60 would proceed as 0, l, 2, 3, 2, 3, 2, 3, 2, 3, 2,,.... 3, 2, l, 0. This, of course, assumes that three copies per original document are desired.
  • the circuit of FIG. 3 enables the operator upon the occurrence of a jam in the record sheet feed mechanism, or any other mechanism moving the record sheets along the transport path, to easily and without complication remove the jammed record sheets as well as any other record sheets which are in the transport path without having to count or examine any of the record sheets or copies to determine which original documents have been copied and how many additional copies need to be made. Also, the operator may then recycle the operation of the machine while maintaining a perfect copy distribution in the sorter apparatus as well as a correct copy number.
  • FIG. 3 Although the system of FIG. 3 has been described in the environment of a xerographic reproduction apparatus, it is apparent that its application is not limited thereto and is easily adaptable to various types of reproduction apparatus.
  • a reproduction machine for making any desired number of facsimiles of a series of original documents which are sequentially positioned at an exposure zone on a like number of record sheets, said machine having a record sheet input and a facsimile-bearing record sheet output with a transport path therebetween, a system comprising:
  • a. storage means for selectively storing the number of desired facsimile-bearing record sheets to be reproduced from each original document
  • first counter means having a first initial condition for counting the number of record sheets entering said transport path
  • second counter means having a second initial condition for counting the number of facsimile-bearing record sheets egressing from said transport path;
  • first coincidence detector means for generating a first coincidence signal indicative of coincidence between the number in said first counter means and the number in said storage means;
  • second coincidence detector means for generating a second coincidence signal indicative of coincidence between the number in said second counter means and the number in said storage means
  • third counter means having a third initial condition responsive to said first coincidence signal for registering a count in one direction and responsive to said second coincidence signal for registering a count in a direction opposite to said one direction;
  • jam detector means responsive to an abnormality in record sheet condition along said transport path for generating a jam detection signal
  • indicator means coupled to said third counter means and responsive to said jam detection signal for indicating the count registered in said third counter means.
  • a system as defined in claim 1 further including:
  • first reset means responsive to said first coincidence signal for resetting said first counter means to said first initial condition
  • said indicator means includes a visual display means for displaying said count registered in said third counter means.
  • a system as defined in claim 1 further including advance means responsive to said first coincidence signal for generating a control signal to control the positioning of said original documents.
  • a storage means for selectively storing the number of desired copies to be reproduced from an original document
  • first counter means having a first initial state for registering a count for each record sheet entering said transport path
  • second counter means having a second initial state for registering a count for each record sheet egressing from said transport path;
  • first coincidence means for generating a first coincidence signal indicative of coincidence between the count in said first counter means and the number in said storage means
  • second coincidence means for generating a second coincidence signal indicative of coincidence between the count in said second counter means and the number in said storage means
  • third counter means having a third initial state for registering a net count which is increased by a predetermined amount is response to said first coincidence signal and decreased by an amount equal to said predetermined amount in response to said second coincidence signal;
  • jam detector means responsive to an abnormality in record sheet condition along said transport path for generating a jam detection signal
  • transfer means responsive to said jam detection signal for equalizing the count in said first counter means to the count in said second counter means.
  • a system as defined in claim 4 further including:
  • first reset means responsive to said first coincidence signal for resetting said first counter means to said first initial state
  • third reset means for resetting said third counter means to said third initial state
  • indicator means responsive to said jam detection signal for indicating said net count registered in said third counter means.
  • a system comprising:
  • a storage means for selectively storing the number of copies desired to be reproduced from an original document
  • first detector means for detecting each record sheet as it enters said transport path
  • counter/coincidence means coupled to said storage means and said first and second detector means for registering a count representative of the difference between the multiples of said number stored in said storage means of record sheets entering said transport path and the multiples of said number stored in said storage means of record sheets egressing from said transport path.
  • a system as defined in claim 6 further including:
  • a. jam detector means in cooperable relation with said transport path and responsive to an abnormality in record sheet condition along said transport path for generating a jam detection signal
  • indicator means responsive to said jam detection signal for indicating said count registered in said counter/coincidence means.
  • said counter/coincidence means includes:
  • first counter means having a first initial state coupled to said first detector means for generating a first count corresponding to each detection by said first detector means;
  • second counter means having a second initial state coupled to said second detector means for generating a second count corresponding to each detection by said second detector means;
  • coincidence means for generating first and second coincidence signals in response to coincidence between said first count and said number in said storage means and between said second count and said number in said storage means, respectively;
  • reversible counter means having a third initial state responsive to said first coincidence signal for registering a count in a first direction and to said second coincidence signal for registering a count in a second direction opposite said first direction.
  • a system as defined in claim 8 further including; a. first reset means responsive to said first coincidence signal for resetting said first counter means to said first initial state;
  • third reset means for resetting said reversible counter means to said third initial state.
  • a system as defined in claim 8 further including:
  • a. jam detector means responsive to an abnormality in record sheet condition along said transport path for generating a jam detection signal
  • a system as defined in claim 10 further including:
  • a. indicator means responsive to said jam detection signal for indicating said count registered in said reversible counter means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Paper Feeding For Electrophotography (AREA)
US595388A 1966-11-18 1966-11-18 Logic control apparatus Expired - Lifetime US3588472A (en)

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US59538866A 1966-11-18 1966-11-18

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AT (1) AT279353B (de)
BE (1) BE706629A (de)
DE (1) DE1611540B2 (de)
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NL (1) NL158945B (de)

Cited By (42)

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Publication number Priority date Publication date Assignee Title
US3734604A (en) * 1970-09-22 1973-05-22 Agfa Gevaert Ag Failsafe system for electrostatic copying apparatus
US3800253A (en) * 1972-09-01 1974-03-26 Nasa Digital controller for a baum folding machine
US3813157A (en) * 1973-04-06 1974-05-28 Xerox Corp Control logic for trouble detection and recovery
US3870868A (en) * 1972-07-21 1975-03-11 Pennsylvania Res Ass Inc Control mechanisms for document-handling apparatus
US3936182A (en) * 1974-08-12 1976-02-03 Xerox Corporation Control arrangement for an electrostatographic reproduction apparatus
US3936180A (en) * 1973-01-04 1976-02-03 Xerox Corporation Xerographic apparatus with sample print capabilities
US3940210A (en) * 1974-08-12 1976-02-24 Xerox Corporation Programmable controller for controlling reproduction machines
US3944359A (en) * 1974-08-12 1976-03-16 Xerox Corporation Programmable controller for controlling reproduction machines
US3944794A (en) * 1972-12-05 1976-03-16 Xerox Corporation Copying system control
US3944360A (en) * 1974-08-12 1976-03-16 Xerox Corporation Programmable controller for controlling reproduction machines
US3948586A (en) * 1972-11-02 1976-04-06 Canon Kabushiki Kaisha Jam detecting device in a copying machine
US3983367A (en) * 1974-02-14 1976-09-28 Glory Kogyo Kabushiki Kaisha Sheet counting machine
US4014609A (en) * 1974-08-12 1977-03-29 Xerox Corporation Programmable controller for controlling reproduction machines
US4021644A (en) * 1975-10-16 1977-05-03 Automatic Parking Devices, Inc. Circuit for monitoring the sequence of events at a cashier checkout center
US4026543A (en) * 1975-11-28 1977-05-31 International Business Machines Corporation Document article handling control
DE2654076A1 (de) 1975-11-28 1977-06-02 Canon Kk Druck- oder kopiergeraet
US4035072A (en) * 1974-08-12 1977-07-12 Xerox Corporation Programmable controller for controlling reproduction machines
US4057341A (en) * 1973-08-31 1977-11-08 Xerox Corporation Dual mode control logic for a multi-mode copier/duplicator
US4163897A (en) * 1977-10-19 1979-08-07 International Business Machines Corporation Automatic copy recovery
EP0005184A1 (de) * 1978-05-05 1979-11-14 International Business Machines Corporation Elektrophotographisches Kopiergerät mit automatischer Dokumentenzuführung
US4210319A (en) * 1978-06-28 1980-07-01 Xerox Corporation Copy set counter duplex tray
US4229100A (en) * 1978-07-03 1980-10-21 International Business Machines Corporation Automatic copy recovery
EP0025664A1 (de) * 1979-09-03 1981-03-25 Mita Industrial Co. Ltd. Vorrichtung zum Zählen von Kopierpapier in einem Kopiergerät
US4312587A (en) * 1977-03-02 1982-01-26 Canon Kabushiki Kaisha Image forming apparatus
US4314754A (en) * 1977-03-02 1982-02-09 Canon Kabushiki Kaisha Image forming apparatus
US4317629A (en) * 1980-02-04 1982-03-02 International Business Machines Corporation Job recovery method and system
US4330197A (en) * 1979-07-16 1982-05-18 Xerox Corporation Recirculating documents duplex copier
EP0077171A2 (de) * 1981-10-09 1983-04-20 Mita Industrial Co. Ltd. Kopiergerät
US4418417A (en) * 1980-04-08 1983-11-29 Laurel Bank Machine Co., Ltd. Reception control system for paper counting machine
US4452525A (en) * 1981-07-08 1984-06-05 Tokyo Shibaura Denki Kabushiki Kaisha Document feed control during copy paper jams
US4456366A (en) * 1977-05-31 1984-06-26 Canon Kabushiki Kaisha Image forming process control
US4487506A (en) * 1982-08-23 1984-12-11 Xerox Corporation Reversing roll inverter with bypass capability
US4511241A (en) * 1981-07-21 1985-04-16 Mita Industrial Company Limited Copying apparatus
EP0166872A1 (de) * 1980-04-15 1986-01-08 Mita Industrial Co. Ltd. Elektrostatisches Kopiergerät
US4627711A (en) * 1985-09-30 1986-12-09 Xerox Corporation Machine shutdown control
US4662740A (en) * 1972-04-13 1987-05-05 Canon Kabushiki Kaisha Electrophotographic device
DE2661068C2 (de) * 1975-11-28 1989-08-24 Canon K.K., Tokio/Tokyo, Jp
US5034770A (en) * 1990-08-30 1991-07-23 Xerox Corporation Job integrity and security apparatus
US5192971A (en) * 1977-03-02 1993-03-09 Canon Kabushiki Kaisha Image forming apparatus with image forming interruption capabilities
US6010127A (en) * 1997-04-14 2000-01-04 Xerox Corporation Internal purge for easy jam clearance in copiers/printers
US6419222B1 (en) 2000-12-12 2002-07-16 Xerox Corporation Sheet inverting apparatus and method
US20090141301A1 (en) * 2007-12-03 2009-06-04 Oce-Technologies B.V Printing device

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CA1161867A (en) * 1979-07-16 1984-02-07 Richard E. Smith Recirculating documents duplex copier

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734604A (en) * 1970-09-22 1973-05-22 Agfa Gevaert Ag Failsafe system for electrostatic copying apparatus
US4662740A (en) * 1972-04-13 1987-05-05 Canon Kabushiki Kaisha Electrophotographic device
US3870868A (en) * 1972-07-21 1975-03-11 Pennsylvania Res Ass Inc Control mechanisms for document-handling apparatus
USRE29470E (en) * 1972-07-21 1977-11-08 Brandt-Pra, Inc. Control mechanisms for document-handling apparatus
US3800253A (en) * 1972-09-01 1974-03-26 Nasa Digital controller for a baum folding machine
US3948586A (en) * 1972-11-02 1976-04-06 Canon Kabushiki Kaisha Jam detecting device in a copying machine
US3944794A (en) * 1972-12-05 1976-03-16 Xerox Corporation Copying system control
US3936180A (en) * 1973-01-04 1976-02-03 Xerox Corporation Xerographic apparatus with sample print capabilities
US3813157A (en) * 1973-04-06 1974-05-28 Xerox Corp Control logic for trouble detection and recovery
US4057341A (en) * 1973-08-31 1977-11-08 Xerox Corporation Dual mode control logic for a multi-mode copier/duplicator
US3983367A (en) * 1974-02-14 1976-09-28 Glory Kogyo Kabushiki Kaisha Sheet counting machine
US3944360A (en) * 1974-08-12 1976-03-16 Xerox Corporation Programmable controller for controlling reproduction machines
US3940210A (en) * 1974-08-12 1976-02-24 Xerox Corporation Programmable controller for controlling reproduction machines
US4014609A (en) * 1974-08-12 1977-03-29 Xerox Corporation Programmable controller for controlling reproduction machines
US3944359A (en) * 1974-08-12 1976-03-16 Xerox Corporation Programmable controller for controlling reproduction machines
US3936182A (en) * 1974-08-12 1976-02-03 Xerox Corporation Control arrangement for an electrostatographic reproduction apparatus
US4035072A (en) * 1974-08-12 1977-07-12 Xerox Corporation Programmable controller for controlling reproduction machines
US4021644A (en) * 1975-10-16 1977-05-03 Automatic Parking Devices, Inc. Circuit for monitoring the sequence of events at a cashier checkout center
DE2654076A1 (de) 1975-11-28 1977-06-02 Canon Kk Druck- oder kopiergeraet
DE2661068C2 (de) * 1975-11-28 1989-08-24 Canon K.K., Tokio/Tokyo, Jp
US4937621A (en) * 1975-11-28 1990-06-26 Canon Kabushiki Kaisha Malfunction display and operation inhibiting device for an image forming apparatus
DE2661117C2 (de) * 1975-11-28 1993-09-09 Canon K.K., Tokio/Tokyo, Jp
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US4312587A (en) * 1977-03-02 1982-01-26 Canon Kabushiki Kaisha Image forming apparatus
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Also Published As

Publication number Publication date
GB1204719A (en) 1970-09-09
BE706629A (de) 1968-05-16
NL158945B (nl) 1978-12-15
DE1611540B2 (de) 1976-11-04
AT279353B (de) 1970-03-10
NL6715580A (de) 1968-05-20
DE1611540A1 (de) 1971-01-14

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