US3833896A - Device for detecting a transport mishap of a copy paper in a reproducing apparatus - Google Patents

Device for detecting a transport mishap of a copy paper in a reproducing apparatus Download PDF

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Publication number
US3833896A
US3833896A US00318356A US31835672A US3833896A US 3833896 A US3833896 A US 3833896A US 00318356 A US00318356 A US 00318356A US 31835672 A US31835672 A US 31835672A US 3833896 A US3833896 A US 3833896A
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United States
Prior art keywords
relay
time
timer
copy paper
activated
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Expired - Lifetime
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US00318356A
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English (en)
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M Suzuki
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Ricoh Co Ltd
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Ricoh Co Ltd
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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

Definitions

  • a delay timer operates an alarm after the lapse of a predetermined period during which a copy paper fails to pass a point in its travel path through the machine. This timer is placed in the operating condition by a signal which is generated when the transfer drum begins to rotate. When the copy paper has been transported normally within a particular time, the operation mode is released.
  • the timer is caused to operate an alarm to indicate the occurrence of the paper jam.
  • three delay timers with a system of associated relays are presented to detect a paper jam at any point in the cycle.
  • the present invention relates to a reproducing apparatus and in particular toa device for detecting a transport mishapof a copy paper in a reproducing apparatus using a transfer drum.
  • reproducing apparatus using a transfer drum, when the transfer drum rotates one revolution, the steps of charging, exposure and development are effected and the developed toner images are transferred onto a copy paper. This is the so-called one cycle reproducing process and one copy is formed by these operations.
  • a repeat mechanism is set to a desired number of copies and the transfer drum 1 rotates the desired number of rotations to form a desired number of cop- 1es.
  • the relation between a mechanism for rotating and driving the transfer drum and a drive mechanism for transporting a copy paper becomes complicated.
  • the time for carrying out one cycle of the reproduction process that is, the time during whch the transfer drum 1 rotates one revolution, may be made shorter than the time between the start of feeding a copy paper and the discharge of the reproduced paper.
  • the copy paper will be still under transportation in the reproducing apparatus when the transfer drum has made one revolution.
  • the next copy paper is fed into a transfer positionin the apparatus while the preceding transferred copy paper is still under transportation.
  • the present invention is intended to overcome such a drawback, that is, when a paper jam has occurred, the paper jam is detected by a timer means and simultaneously an alarm device is operated in order to stop the feed of the next copy paper.
  • the time during which a transfer drum makes one revolution is about 4 seconds.
  • the transport time of the copy paper during reproduction by this transfer drum is about 4.7 seconds. Therefore, the transport time of the copy paper is 0.7 second longer than the revolution time of the transfer drum.
  • the difference between the transfer drum revolution time and the transport time of the reproducible copy paper is due to the comparable sizes of the drum copy paper and is 4.7 seconds at most.
  • a delay timer which operates after a lapse of 5 seconds is used in consideration of the longest second time of 4.7 seconds.
  • This timer is put in the operating condition by a signal which is generated when the transfer drum 1 begins to rotate.
  • the operation mode is released.
  • the timer is caused to operate to indicate, such as by an alarm the occurrence of the paper jam. In such a way, the paper jam is detected through a timer means.
  • the present invention consists in providing a pair of time delay timers, one of which detects the paper jam of odd numbered copy papers and the others detects that of even numbered papers on the basis of the fact that a copy paper is still under transportation in the apparatus when the copy drum has completed one revolution and putting the delay timer detecting the paper jam of even numbered copy papers in an operating condition by transferring the signal generated at the starting of the revolution of the transfer drum 1 to another source of signal through a relay in the case of even numbered copy papers.
  • FIG. I is a partial schematic view of a transfer type reproducing apparatus incorporating the present invention.
  • FIG. 2 is a circuit diagram illustrating the electrical circuit in accordance with the present invention.
  • FIG. 3 is a time sequence diagram illustrating the op eration of the electrical circuit shown in FIG. 2.
  • the transferred copy paper is further fed out and its leading end collides with a separating finger 6, whose leading end is dropped into a slot la of the transfer drum 1. Then the finger 6 is moved to the dotted-line position, and the copy paper is separated from the drum 1 and fed out onto a transport belt 7.
  • the transport belt 7 is entrained over a plurality of transport rollers 8a and 8d and feeds out the transferred copy paper to a discharge opening.
  • a reproducing apparatus of such construction when the position of the separating finger 6 is mechanically distorted for some reason, the normal separation of the copy paper is not effected and the transfer drum 1 becomes wrapped with the copy paper or the copy paper advances passing the vicinity of the finger 6 in the direction of an arrow A without colliding against the finger 6 and enters into another machine part.
  • this transfer type reproducing apparatus may be used in the transfer of any kind of copy paper, the conditions of transport and separation change depending upon the nature of the paper used as a copy paper.
  • FIG. 2 is an electric circuit diagram of the apparatus of the present invention.
  • the leftmost leg consists of switching contacts Tla, T2a and T3a of respective time delay timers T1, T2 and T3, whose operation will be explained in greater detail later.
  • One terminal b of contact T3a is connected to a paper start switch PS, which closes at the instant when the transfer drum 1 begins to rotate to generate a pulsive signal for notifying the beginning of a reproducing operation.
  • Switch PS is connected to a terminal Eb of source E through a relay RAl.
  • Each switching contact Tla, T2a or T3a switches from its terminal b to its terminal when its respective timer T1, T2 or T3 is operated.
  • the terminal c of each timer is connected in common to the terminal Eb of the power source E through a crime CI-I which provides an alarm sound when activated.
  • a solenoid SOL which when activated causes the drawout rollers 3a and 3b to be driven for a while in order to feed a copy paper.
  • a relay RAS in series with a change-over switch MS for detecting the transfer mishap. More particularly, a moving arm MSo of this switch MS is connected to the terminal Ea of the power source E and the relay RAS is connected between its fixed terminal b and the terminal Eb of the power source. Also, to the fixed terminal aof this switch MS, is connected the relay RA2 via its normally opened type contact RA2-l. Further, change-over switch MS is positioned at the discharge opening of the reproducing apparatus as shown in FIG. 1 so that its moving arm MSo will be switched fromthe fixed terminal a to the terminal b by engagement with the leading end of the transported copy paper. Therefore, the moving arm M is switched to the fixed terminal b when a copy paper to be discharged pushes it while passing.
  • timer T3 consisting of a timer delay relay.
  • This timer T3 causes current to flow when the change-over switch MS is switch to the terminal b and is made to operate for instance 5 seconds after the beginning of the current flow.
  • the contact T3a is switched from its terminal b to terminal c. Therefore, when switch MS is changed over, current flows through the chime CH, actuating the chime alarm.
  • timer T3 serves to provide an alarm whenthe moving arm MSo does not return to its original position, for any reason, after it has changed over to the fixed terminal b and the copy paper has been discharged through the discharge openmg.
  • a further leg is connected between the junction of the contacts RA4-3 and RA7-1, and the terminal Eb of the power source, and contains in series normally opened contact RAS-l of relay RAS and the relay RA6, and in parallel across both ends of the contact RAS-l, there is connected the normally opened contact RA6-l of the relay RA6. Further, across both ends of the power source E, there is connected a series circuit of normally closed contact RA8-l of relay RA8, normally opened contact RA3-3 of the relay RA3, the normally opened contact RAl-3 of the relay RAl, and the relay RA4. In parallel across the ends of the contacts RA3-3 and RAl-3, is connected normally opened contact RA4-1 of the relay RA4.
  • normally opened contact RA7-2 of the relay RA7 In the remaining legs, across the ends of the power source E, there are connected in series normally opened contact RA7-2 of the relay RA7, normally opened contact RA5-2 of the relay RAS, and the relay RAS, with normally opened contact RA8-2 of the relay RA8 connected in parallel across the normally opened contact RA7-2; normally opened contact RA3-2 of the relay RA3 and a timer Tl consisting of a time delay relay; and normally opened contact RA4-2 of the relay RA4 and timer T2 consisting of a time delay relay.
  • timer Tl detects paper jams caused by the odd numbered copy papers and the timer T2 detects those caused by the even numbered papers. Finally all the relays and timers are provided with by-pass diodes as shown in FIG. 2.
  • the above-described electric circuitry constitutes the detecting device of the present invention. Now the operation of the circuit will be explained with reference to the time sequence diagram shown in FIG. 3.
  • the switch PS is closed by the starting of the drum.
  • the relay RAl and the solenoid SOL are actuated.
  • the drawing out rollers 3a and 3B are driven and the transport of a copy paper 3b begun; while upon actuation of relay RAl, simultaneously, the contact RAl-l is opened, the contact RA1-2 is closed, and the contact RAl-3 is also closed.
  • the relay RA2 When the contact RAl-Z is closed, the relay RA2 operates, owing to the current flow therethrough, and consequently, the contacts RA2-l and RA2-2 are closed. If when the contact RA2- 1 is closed, the moving arm MS of the switch MS is in contact with its fixed terminal a, the contact RA2-l and arm MS0 will afford another current. path to the relay RA2.
  • the switch PS is such that it is merely momentarily closed, so that the relay RAl conducts current only momentarily and the contacts RAl-l and RAl-2 are actuated for just a short time whereupon the contact RAl-l is again closed and the contact RA1-2 is opened. However, as the contact RA2-l is still closed, the relay RA2 continues to conduct. Further, when the contact RAl -l is closed, the relay RA3 is actuated since the contact RA2-2' is already closed. When this relay RA3is operated, the contacts RA3-1, RA3-2 and RA3-3 are closed. The closing of contact RA3-l creates another current path to relay RA3.
  • the timer Tl begins to conduct current.
  • the timer T1 is set to be actuated for a predetermined period, for instance 5 seconds.
  • a predetermined period for instance 5 seconds.
  • the timer Tl operates the contact Tla, which is switched from the fixed terminal b to the terminal c.
  • the chimeCI-I is operated. to. give an alarm notifying that the paper jam has occurred.
  • contact RA3-2 is openediand the'detecting condition of the timer T1 is released.
  • the timer T3 is actuated to. conduct current.
  • the detecting action is transferred to timer T3 and continues until the rear end of the copy paper is fully discharged.
  • the timer T3 which may be set to operate for 5 seconds, when changes over the contact T3a from the fixed terminal b to the terminal 0. Therefore, this extraordinary condition may be alarmed through the chime CH.
  • the detecting operation continues in this way.
  • the switch arm MS0 is changed over to the contact a to interrupt the circuit continuity through the relay RAS and the timer T3, and all the contacts are reset to their original condition.
  • the relay RA4 operates to close the contacts RA4-1, RA4-2 and RA4-3 when the contact RAl-3 is closed. With the contact RA4-1 closed, the relay RA4 will continue to operate even through the contact RA1-3 is then opened. Further, with the contact RA4-2 closed, the timer T2 is caused to begin operation and the detecting condition for the paper jam of the 2nd sheet is now operative. Then, when the switch MS is engaged and changed over to the terminal b by the leading edge of the 1st sheet, the timer T1 becomes deactivated and the timer T3 is changed over to the detecting condition in the manner mentioned above.
  • the switch MS when the switch MS is changed over to the terminal b, the contacts RAS-l and RA5-2 are closed and the contact RA5-3 is opened because the relay RAS is operated.
  • the closing of contact RAS-l causes relay RA6 to operate resulting in the reaction of another current flow path to itself by the closure of the contact RAG-l, and also closing the cntact RA6-2.
  • the switch MS When the discharge of the 1st sheet is normally effected, the switch MS is changed back to the terminal a deactivating timer T3. When this switching is effected, the circuit continuity to the relay RAS is interrupted to open the contacts RA5-l,RA5-2 and to close the contact RA5-3.
  • the timer T2 only is in the condition. for detecting the paper jam of the 2nd sheet. If the paper jam condition occursfor the 2nd sheet,.after aipredetermined lapse of time, the timer T2 operates to change over the contact T2a from the terminal b to the terminal c so as to ring chime CH for notifying that the 2nd sheet has induced the paper jam. While the 2nd sheet is being transported normally, the reproductionv of the third copy is begun through the repeat mechanism. As the 3rd sheet isan odd numbered copy,.the relays RA2 and- RA3 operate as in the case of the first copy.
  • the subsequent operations of the circuit is the same as for the first copy.
  • the transport of the third. sheet starts the timer T1 in the operating condition.
  • the switch arm M50 is changed over from the termial a to the terminal b.
  • contact RA7-3 is closed, relay RA-2 and in turn relay RA3 will remain operative, so that contact RA3-2 remains closed and timer T1 continues its operation.
  • the tim r T3 is also actuated by the changeover to begin the detecting operation until the second copy paper is discharged, and the relay RA5 operates again to close the contacts RAS-l, RA5-2, and to open the contact RAS- 3.
  • the relays RA2, RA3, RAS and RA8 are in operating condition.
  • the timers T1 and T3 are thus operating to detect any paper jam of the second and third copy papers respectively.
  • the next or fourth paper that is, another even numbered paper is transported activating relay RA4 to operate the timer T2 and deactivating relay RA3 cutting off timer T1.
  • the operation of each relay and the changeover of the switch MS for these third and fourth copy papers are then similar to those for the first and second copy papers.
  • timers T1, T2 and T3 causes a chime to give an alarm for notifying an operator of the occurrence of a paper jam
  • the use of a chime is not necessary, but rather a buzzer, a lamp or another indicating device may also be used.
  • the paper supply mechanism may be inactivated by the alarm and any suitable means may be applied for this procedure.
  • the present invention may be applied to any reproducing apparatus wherein the time for one cycle of a reproducing process is shorter than the time between the start of feeding a copy paper and the discharge of the reproduced paper and the beginning time of the reproducing steps has a predetermined time relation with the beginning time of transporting a copy paper.
  • a device for detecting a transport mishap of a copy paper comprising a circuit including:
  • detector means for switching from a normal condition to an alternate condition during the passage of a copy paper thereby;
  • relay means activated in response to the initiation of the reproducing process
  • timer means activated to operate for a predetermined period of time in response to the activation of said relay means, for operating said indicator means if said detector means after the lapse of the predetermined period of time has not been switched to its alternate condition;
  • said timer means comprising a first time delay timer and said relay means comprising:
  • a third relay activated in response to the activation of said second relay, for operating said first time delay timer, said second and third relays being deactivated by the switching of said detector means to its alternate condition.
  • a device as in claim 1 further comprising second timer means activated to operate for a second predetermined period of time in response to the switching of said detector means to its alternate condition, for operating said indicator means if said detector means after the lapse of the second predetermined period of time has not been switched to its normal condition.
  • a device as in claim 1 further comprising a second time delay timer and a fourth relay, activated in response to the activation of said first relay when said detector means is in its normal condition, for operating said second time delay timer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Handling Of Cut Paper (AREA)
US00318356A 1971-12-28 1972-12-26 Device for detecting a transport mishap of a copy paper in a reproducing apparatus Expired - Lifetime US3833896A (en)

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JP37372A JPS5340093B2 (en]) 1971-12-28 1971-12-28

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JP (1) JPS5340093B2 (en])
DE (1) DE2262583C3 (en])
GB (1) GB1383530A (en])

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948510A (en) * 1973-11-19 1976-04-06 Ricoh Co., Ltd. Sheet jam detector for electrophotographic copying machine
US4026543A (en) * 1975-11-28 1977-05-31 International Business Machines Corporation Document article handling control
US4244648A (en) * 1979-05-30 1981-01-13 Savin Corporation Misfeed detector for copy machine
US4275879A (en) * 1979-10-03 1981-06-30 Tokyo Shibaura Denki Kabushiki Kaisha Abnormal feed condition-detecting apparatus for a printing device
US4307957A (en) * 1978-04-11 1981-12-29 Minolta Camera Kabushiki Kaisha Paper jam detecting device for use in an electrophotographic copying machine
US4557587A (en) * 1977-05-31 1985-12-10 Canon Kabushiki Kaisha Related to control while apparatus is in an improper operational state
US4588884A (en) * 1983-09-13 1986-05-13 Burroughs Corp. Automatic plant shutdown equipment

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5517377B2 (en]) * 1972-07-22 1980-05-10
JPS5410943Y2 (en]) * 1972-11-06 1979-05-18
JPS5414380Y2 (en]) * 1975-03-07 1979-06-14
JPS5236031A (en) * 1975-09-17 1977-03-19 Copyer Co Ltd Detector for an extraodinary state of a transfer paper in copying machine
JPS52110848U (en]) * 1976-02-20 1977-08-23
JPS5490134U (en]) * 1977-12-05 1979-06-26
JPS5531556Y2 (en]) * 1978-07-17 1980-07-28
JPS60138468U (ja) * 1984-02-22 1985-09-13 ピジヨン株式会社 乳児用枕
US4589765A (en) * 1985-05-22 1986-05-20 Xerox Corporation Sheet feeder control for reproduction machines
JPH01267074A (ja) * 1988-04-19 1989-10-24 Oki Electric Ind Co Ltd 伝票処理装置
US5697880A (en) * 1995-03-17 1997-12-16 Pitney Bowes Inc. Inserter including a pivoting conveyor module with staging capability
US5649892A (en) * 1995-03-17 1997-07-22 Pitney Bowes Inc. Apparatus and method for conveying a sheet
KR102598899B1 (ko) * 2021-05-13 2023-11-07 주식회사 바이오스탠다드 히알루론산 기반 기능성 하이드로겔 복합체 및 이의 제조방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3453500A (en) * 1967-03-03 1969-07-01 Gen Time Corp Sequential timing circuit
US3618936A (en) * 1969-10-31 1971-11-09 Xerox Corp Jam detection system for sorting apparatus
US3626956A (en) * 1970-08-21 1971-12-14 Burroughs Corp Item transport deviation detection device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467469A (en) * 1966-10-17 1969-09-16 Dennison Mfg Co Cover for photocopiers
US3655283A (en) * 1969-12-31 1972-04-11 Addressograph Multigraph High speed photoelectrostatic copying machine
JPS552622B2 (en]) * 1971-08-12 1980-01-21

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3453500A (en) * 1967-03-03 1969-07-01 Gen Time Corp Sequential timing circuit
US3618936A (en) * 1969-10-31 1971-11-09 Xerox Corp Jam detection system for sorting apparatus
US3626956A (en) * 1970-08-21 1971-12-14 Burroughs Corp Item transport deviation detection device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948510A (en) * 1973-11-19 1976-04-06 Ricoh Co., Ltd. Sheet jam detector for electrophotographic copying machine
US4026543A (en) * 1975-11-28 1977-05-31 International Business Machines Corporation Document article handling control
US4557587A (en) * 1977-05-31 1985-12-10 Canon Kabushiki Kaisha Related to control while apparatus is in an improper operational state
US4307957A (en) * 1978-04-11 1981-12-29 Minolta Camera Kabushiki Kaisha Paper jam detecting device for use in an electrophotographic copying machine
US4244648A (en) * 1979-05-30 1981-01-13 Savin Corporation Misfeed detector for copy machine
US4275879A (en) * 1979-10-03 1981-06-30 Tokyo Shibaura Denki Kabushiki Kaisha Abnormal feed condition-detecting apparatus for a printing device
US4588884A (en) * 1983-09-13 1986-05-13 Burroughs Corp. Automatic plant shutdown equipment

Also Published As

Publication number Publication date
DE2262583C3 (de) 1980-12-18
DE2262583B2 (de) 1980-04-17
JPS4871655A (en]) 1973-09-27
GB1383530A (en) 1974-02-12
DE2262583A1 (de) 1973-07-12
JPS5340093B2 (en]) 1978-10-25

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