US3693969A - Electrophotographic apparatus - Google Patents

Electrophotographic apparatus Download PDF

Info

Publication number
US3693969A
US3693969A US3693969DA US3693969A US 3693969 A US3693969 A US 3693969A US 3693969D A US3693969D A US 3693969DA US 3693969 A US3693969 A US 3693969A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
means
copy material
time interval
jamming
copy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Hisashi Sakamaki
Yoshimasa Kimura
Osamu Sawamura
Susumo Sugiura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/70Detecting malfunctions relating to paper handling, e.g. jams

Abstract

A device for detecting the jamming of copy material in a photocopying machine or the like is provided which can detect not only jamming of copy material occured at any portion of the whole path thereof but also jamming occured in a particular device or station where the jamming tends to occur or causes a serious dangerous condition. The actual time intervals required for copy material to pass through the whole path and through the particular station are compared with the reference time intervals respectively so that when the actual time intervals are longer than the reference time intervals, a warning signal is generated. The warning signal may be used to automatically stop the operation of the photocopying machine or its particular station such as a fixing station in order to prevent a fire hazard.

Description

United States Patent Sakamaki et al.

{s41 ELECTROPHOTQGRAPHIC APPARATUS 72] Inventors: Hisashi Sakamaki, Yokohama; Yoshimasa Kimura; Osamu Sawamura, both of Tokyo; Susumo Sugiura, Yamato, all of Japan [73] Assignee: Canon Kabushiki Kaisha, Tokyo,

Japan [22] Filed: Jan. 25, 1971 [21] Appl. No.: 109,214

[151 3,693,969 51 Sept. 26, 1972 Primary Examiner-Joseph Wegbreit AttorneyWard, McElhannon, Brooks & Fitzpatrick [5 7] ABSTRACT A device for detecting the jamming of copy material in a photocopying machine or the like is provided which can detect not only jamming of copy material occured at any portion of the whole path thereof but also jamming occured in a particular device or station where the jamming tends to occur or causes a serious dangerous condition. The actual time intervals required for copy material to pass through the whole path and through the particular station are compared with the reference time intervals respectively so that when the actual time intervals are longer than the reference time intervals, a warning signal is generated. The warning signal may be used to automatically stop the operation of the photocopying machine or its particular station such as a fixing station'in order to prevent a fire hazard.

5 Claims, 7 Drawing Figures ELECTROIl-IOTOGRAPHIC APPARATUS BACKGROUND OF THE INVENTION in spaced-apart relation with each other by a predetermined distance so that a reference time interval required for the copy material to pass over the distance between the two detecting means under the normal condition may becompared with an actual time interval required for the copy material to pass over the distance between the two detecting means so as to detect the jamming by the difference between the reference and actual time intervals. The prior art device of the type described has the defects that it requires a large number of component parts, a large installation space and it is complex in construction, which tends to lead to the difficulty in maintenance and repair and to a false operation.

The jamming of copy material in the photocopying machines or the like tends to occur in the following devices or portions:

i. in a copy material feeding device where the jamming occurs due to the false operation of the feeding device;

ii. at a separator in case of an image-transfer type photocopying machine where the jamming occurs when the copy material does not completely separated from an electrophotographic photosensitive member or the like after image transfer; and

iii. in a fixing station where a conveyor beltfor transporting the copy material through the fixing station is universally of the wire screen type because the surface of the copy material is subjected to an elevated temperature between l50250C in order to fuse and pass the toner to the copy material, so that the copy material tends to be caught or jammed by the screen.

The jamming of copy material will cause a fire of and a damage to the photocopying machine or the like.

SUMMARY OF THE INVENTION One of the objects of the present invention is therefore to provide a device for detecting the jamming of copy material in a photocopying machine or the like capable of giving a warning signal upon the occurrence of jamming in the whole path of the copy material through the photocopying machine or the like by detecting a difference between a reference time interval required for the copy material to pass through the whole path and an actual time interval required.

Another object of the present invention is to provide a device for detecting the jamming of copy material in a device or portion where the jamming tends to occur very often.

Another object of the present invention is to provide a device for detecting the jamming of copy material not only in the whole path of copy material but also in a particular device or portion in the photocopying machine or the like, that is the jamming detecting device capable of accomplishing the above two objects of the present invention simultaneously so as to detect the jamming occured from the time when the copy material feed or transportation is initiated to the time when the copy material is completely discharged out of the fixing station.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a schematic view illustrating the path of copy materialin a photocopying machine. provided with a jamming detecting device of the first embodiment of the present invention;

FIG. 2 is a block diagram for explanation of the mode of operation of the first embodiment;

FIG. 3 is an electric circuit diagram of the embodiment of the present invention;

FIG. 4 is schematic view illustrating the arrangement 7 DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a switch 3 is actuated by a cam 6 carried by a control roller 2 which is rotated in synchronism with a feed roller 10 for feeding copy papers 1 one by one. Another switch 4 is disposed at the discharge end of a fixing station 11 so as to detect the arrival of a processed copy paper 1. The device for detecting the jamming of copy paper in a photocopying machine in accordance with the present invention is characterized by the fact that the difference between a reference time interval counted by a timer 5 (See FIG. 2) which is actuated in synchronism with the actuation of the switch 3 and an actual time interval from the time when the switch 3 is actuated to the time when the switch 4 is actuated is used to detect whether the jamming of copy paper exists or not in the photocopying machine.

Upon depression of a copy button (not shown), the control roller 2 starts rotation so that the cam 6 closes the switch 3, thereby actuating a relay 7 (See FIG. 2). In consequence, the relay 7 is self-held for a reference time interval Ts as the timer 5 is actuated simultaneously. A gate 8 is so arranged as to remain opened when the following relation is held:

Ts To where To is an actual time interval from the time when the feeding of copy paper 1 is started to the time when the copy paper 1 reaches the discharge end of the fixing station 11 after having been transported through the photocopying machine under the normal condition without jamming.

When the jamming of copy paper 1 occurs, the actual time interval T0 will become longer so that the time interval relation becomes In this case the gate 8 is opened so that the output from tors or switches 3 and 4 are disposed at the feeding and discharge ends of the passage of the copy papers 1 so that the actual time interval To required for the copy paper 1 to be transported through the path in the photocopying machine may be compared with the reference time interval Ts required for the copy paper 1 to pass through the path under normal conditions, that is without jamming. The difference between the actual and reference time intervals To and Ts is used for detecting the jamming of copy .paper. The first embodiment has an advantage that the whole passage of copy papers may be monitored. In the first embodiment, the leading edge of the copy paper 1 actuates the detector or switch 4 at the discharge end, but jamming will occur when the copy paper has not passed yet through the detector or switch 4 even though the detector or switch 4 has been actuated, giving the signal of normal transportation or passage of the copy paper. This type of jamming cannot be detected by the first embodi ment. In addition in case of the occurrence of this type of jamming the copy paper is generally jammed in the fixing station 11 and is overheated by a heater (not shown) in the fixing station, thus causing a fire hazard condition.

Another embodiment to be described hereinafter is to eliminate this defect of the first embodiment and is characterized in that the jamming signal is generated when where T is a time interval required for copy paper 1 to pass through a device or station in which jamming tends to occur very often; and

Ts is a reference time interval set by a timer, that is a time interval required for the copy paper to pass through the deviceor station under the normal conditions.

- The first embodiment will be described in more detail with reference to FIG. 3. When the transporta tion or feed of the copy paper 1 is started, the first switch 3 is actuated or closed so as to energize a relay 22 closing its contact 22a. In consequence the relay 22 is self-held. Since the copy paper 1 has not arrived yet at the second switch 4, a transistor 30 is turned off while a transistor 32 is turned on so that a relay 33 is energized to open its contact 330 and to switch its movable contact 33b from a fixed contact A to B. A capacitor 37 is charged with a time constant determined in conjunction with a resistor 36. When the copy paper 1 reaches the second switch before the capacitor 37 is charged to a voltage sufficient enough to turn on a double-base diode 25, the transistor 30 is turned on by the energization of the switch 4 while the transistor 32 is turned off thereby de-energizing the relay 33. The movable contact 33b is switched back to the fixed contact A and the contact 33a is reset or closed. However, when the copy paper 1 does not reach the second switch, the voltage across the capacitor 37 reaches a level to turn on the double-base diode 25 and also a silicon-controlled rectifier 26 thereby energizing a relay 27. In consequence a contact 27a is closed to thereby turn on a warning lamp 35.

Next, further embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 illustrates a fixing station having fixing means 11 and 11' disposed in the vicinity of the discharge end of the photocopying machine. A jamming detector consisting of a light source 12 and a photoconductive element 13 is disposed at the discharge end of the fixing station. The light beam from the light source 12 to the photoconductive element 13 will be interrupted when the copy paper 1 reaches the jamming detector so that the resistance of the photoconductive element 13 is varied accordingly. In response to the variation in resistance of the element 13 both of an amplifier 17 and a timer 18 in a switching circuit shown in block diagram in FIG. 5 are simultaneously actuated and a comparator 19 compares the reference time interval Ts (See FIG. 6) of the timer 18 with the actual time interval T required for the copy paper 1 to pass through the jamming detector. When the copy paper 1 is transported under the normal condition, the condition is satisfied. On the other hand, when the jamming occurs, the time interval relation will become That is, there is a time difference At as shown in FIG. 6. In this case, the output is derived from the comparator 19 to actuate an alarm system 20.

In summary, in the first and second embodiments, the detector or monitor is disposed in a device or station in the path of the copy paper where the jamming tends to occur often so that the actual time interval for the copy paper to pass this detector is compared with the reference time interval for detecting the occurrence of jamming. Therefore, the sensitivity for detecting the jamming may be much improved as compared with the system in which the actual time interval required for the copy paper to pass between two pointsis compared with a reference time interval.

Next with reference to FIG. 7 the third embodiment of the present invention will be described which is the combination of the first embodiment with the second embodiment. Upon initiation of the feeding of copy paper, a switch 21 is closed to energize the relay 22 to close the contact 22a thereby self-holding the relay 22. The movable contact 225 is switched from the fixed contact A to B so that the capacitor 24 is charged through a variable resistor 23 to a predetermined voltage after a time interval determined by a CR time constant. When the copy paper 1 reaches the detector as shown in FIG. 4 under the normal condition without jamming, the beam from the light source 12 to the photoconductive element 13 is interrupted so that the resistance of the element 13 is increased. The voltage across the element 13 becomes higher than the emitter potential of the transistor 30 applied through the Zener diode 29 to thereby turn on the transistor 30. The voltage across the collector resistor 31 drops so that the transistor 32 is turned on to energize the relay 33. The

contact 33a is opened to de-energize the relay 22. The movable contact 22b is switched to the fixed contact A and the capacitor 24 is discharged through the resistor 34. Thus, the double-base diode 25 and also the thyristor 26 are not turned on.

If the copy paper 1 fails to reach the detector within the reference time interval, the double-base diode 25 is turned on so that the thyristor 26 is turned on to energize the relay 27 to close its contact 27a to thereby turn on the warning lamp 35 as in the manner described above.

Once the copy paper 1 has reached the detector the relay 33 is energized so as to switch the movable contact from the fixed contact A to the fixed contact B so 7 that the capacitor 37 is charged through the variable resistor 36. When the copy paper 1 passes through the detector before the voltage across the capacitor 37 reaches a predetermined value, the relay 27 is not energized. However, when the jamming occurs when the copypaper l is still passing through the detector, the copy paper cannot .pass through the detector within the reference time interval so that the relay 27 is energized to thereby turn on the warning lamp 35.

We claim:

1. A device for detecting the jamming of copy material in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine, sensingmeans disposed in the path of said copy material,

timer means for counting a reference time interval required for said copy material to pass through said sensing means under normal conditions, said timer means including means for initiating said reference time interval as a leading edge of said copy material passes through said sensing means, and

means for generating an output signal when the actual time interval required by said copy material to pass through said sensing means is longer than said reference time interval.

2. A' device for detecting the jamming of copy material in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine,

means for feeding said copy material to said transporting means,

a first switching means,

control means for actuating said first switching means in response to actuation of said feeding means,

timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path,

second switching means disposed at the end of said predetermined path of said copy material, and

means for generating an output signal when a time interval from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts.

3. The device according to claim 1, wherein said sensing means comprises a light source and a photoresponsrve element opposed 0 said light source and connected to said timer means. I

4. The device according to claim 1, wherein said machine includes means for fixing an image produced on said copy paper, and wherein said sensing means is disposed in the vicinity of a discharge end of said fixing means.

5. A device for detecting the jamming of copy material for use in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine,

means for feeding said copy material to said transporting means,

first switching means,

control means for actuating said first switching means in response to actuation of said feeding means,

first timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path,

second switching means disposed at the end of said predetermined path of said copy material,

first output generating means for generating a first output signal when a time interval T0 from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts,

sensing means disposed adjacent the end of said predetermined path of said copy material,

second timer means for counting a reference time interval Ts required for said copy material to pass through said sensing means under normal conditions,

second output generating means for generating a second output signal when a time interval T required for said copy material to pass through said sensing means is longer than said second reference time interval Ts, and

means for generating a warning signal when either of said first or second output generating means generates a said output.

0 l0 6 -C UNITE D S'IA'IES PATEI T FFICE CERTIFICATE OF CORRECTION Patent No. 3,693,969 Dated September 26, 1972 Inventor s et a].

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 3 line 50, after "22a add--and switching its Contact 22b to position B-;

line 52, change "is turned" to remains after "off" add-,

line 53, change "while" to-as does-;

delete "is turned on"; delete "is";

line 54, change "energized' .to. open" to remains deenergized with-.

lines 54-55, change "and to switch its movable 'contact33b from .a

- fixed contact A to B to in a closed position-;

line 63, change "33b" to-2 2b-- v line 64, delete "and the contact33a is reset or closed".

FOHN vo-msc-(xc-om r Q Patent: No.

Inventor(s) Column 4, lin

line

line

line

line

Column 5, line lin-e line line

line

line

(SEAL) Attest:

and that said Letters Patent are 52, change 53, chan e change the-; change change I delete change change change 13,7change 14, change 15, change EDWARD M.FL'ETCHER,JR. Attesting Officer UNITED S'IA'IES' PATENT OFFICE CEPUfI-FICATE OF CORRECTION Dated September 26, 1972- HISASHI SAKAMAKI et al It is certified that error appears in the above-identified patent hereby corrected as shom'x below:

"t to its (first occurren 3". to-'-36 Y "34" to-connected to contact A-;

"the" (first occurrence) after "tact" add33b-;

Signed and sealed this 13th day of February 1973..

ROBERT GOTTSCHALK Commissioner oi Patents

Claims (5)

1. A device for detecting the jamming of copy material in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine, sensing means disposed in the path of said copy material, timer means for counting a reference time interval required for said copy material to pass through said sensing means under normal conditions, said timer means including means for initiating said reference time interval as a leading edge of said copy material passes through said sensing means, and means for generating an output signal when the actual time interval required by said copy material to pass through said sensing means is longer than said reference time interval.
2. A device for detecting the jamming of copy material in a photocopYing machine or the like comprising means for transporting copy material along a predetermined path through said machine, means for feeding said copy material to said transporting means, a first switching means, control means for actuating said first switching means in response to actuation of said feeding means, timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path, second switching means disposed at the end of said predetermined path of said copy material, and means for generating an output signal when a time interval from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts.
3. The device according to claim 1, wherein said sensing means comprises a light source, and a photo-responsive element opposed to said light source and connected to said timer means.
4. The device according to claim 1, wherein said machine includes means for fixing an image produced on said copy paper, and wherein said sensing means is disposed in the vicinity of a discharge end of said fixing means.
5. A device for detecting the jamming of copy material for use in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine, means for feeding said copy material to said transporting means, first switching means, control means for actuating said first switching means in response to actuation of said feeding means, first timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path, second switching means disposed at the end of said predetermined path of said copy material, first output generating means for generating a first output signal when a time interval To from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts, sensing means disposed adjacent the end of said predetermined path of said copy material, second timer means for counting a reference time interval Ts'' required for said copy material to pass through said sensing means under normal conditions, second output generating means for generating a second output signal when a time interval T required for said copy material to pass through said sensing means is longer than said second reference time interval Ts'', and means for generating a warning signal when either of said first or second output generating means generates a said output.
US3693969A 1970-01-27 1971-01-25 Electrophotographic apparatus Expired - Lifetime US3693969A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP845770 1970-01-27
JP4705770U JPS557956Y1 (en) 1970-05-14 1970-05-14
US10921471 true 1971-01-25 1971-01-25

Publications (1)

Publication Number Publication Date
US3693969A true US3693969A (en) 1972-09-26

Family

ID=27278023

Family Applications (1)

Application Number Title Priority Date Filing Date
US3693969A Expired - Lifetime US3693969A (en) 1970-01-27 1971-01-25 Electrophotographic apparatus

Country Status (2)

Country Link
US (1) US3693969A (en)
DE (1) DE2103587B2 (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790158A (en) * 1972-05-22 1974-02-05 Xerox Corp Automatic document handler
US3819266A (en) * 1972-12-05 1974-06-25 Xerox Corp Copier jam protection
DE2460616A1 (en) * 1973-12-21 1975-07-03 Canon Kk Clamping interference suppressor for a kopiergeraet
US3920328A (en) * 1974-07-24 1975-11-18 Pitney Bowes Inc Adjustable paper jam responsive device for an electrostatic copier
US3926429A (en) * 1972-12-02 1975-12-16 Ricoh Kk Copy sheet stripping device
US3948586A (en) * 1972-11-02 1976-04-06 Canon Kabushiki Kaisha Jam detecting device in a copying machine
US3948510A (en) * 1973-11-19 1976-04-06 Ricoh Co., Ltd. Sheet jam detector for electrophotographic copying machine
US3970384A (en) * 1972-01-25 1976-07-20 Canon Kabushiki Kaisha Safety device for photocopying machine
JPS51112544U (en) * 1975-03-07 1976-09-11
US4022460A (en) * 1976-02-05 1977-05-10 Pitney-Bowes, Inc. Document jam detector for copier
JPS5272233A (en) * 1975-12-12 1977-06-16 Minolta Camera Co Ltd Detector for paper jam in the electrophotographic copying machine
US4030409A (en) * 1973-01-26 1977-06-21 Addressograph Multigraph Corporation Printing apparatus controls
JPS539532A (en) * 1976-07-14 1978-01-28 Kopia Kk Paper jam detector
US4166615A (en) * 1974-12-27 1979-09-04 Sharp Kabushiki Kaisha Means for determining difference in copy sheet transportation states for an electrostatic reproduction machine
US4275879A (en) * 1979-10-03 1981-06-30 Tokyo Shibaura Denki Kabushiki Kaisha Abnormal feed condition-detecting apparatus for a printing device
US4281244A (en) * 1978-06-17 1981-07-28 Minolta Camera Kabushiki Kaisha Apparatus for detecting sheet-formed support material
US4307957A (en) * 1978-04-11 1981-12-29 Minolta Camera Kabushiki Kaisha Paper jam detecting device for use in an electrophotographic copying machine
US4320961A (en) * 1980-01-28 1982-03-23 Nashua Corporation Jam detecting apparatus and method for electrostatic copier
EP0104087A2 (en) * 1982-09-21 1984-03-28 Xerox Corporation Sheet transport
US4557587A (en) * 1977-05-31 1985-12-10 Canon Kabushiki Kaisha Related to control while apparatus is in an improper operational state
US4662740A (en) * 1972-04-13 1987-05-05 Canon Kabushiki Kaisha Electrophotographic device
US5008712A (en) * 1980-10-17 1991-04-16 Canon Kabushiki Kaisha Variable magnification copying apparatus and automatic shutdown therefor
US5068693A (en) * 1989-06-05 1991-11-26 Fujitsu Limited Sheet path sensor provided in an electrophotographic image forming apparatus
US20040046314A1 (en) * 2002-09-09 2004-03-11 Fuji Xerox Co., Ltd Image forming apparatus

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5340093B2 (en) * 1971-12-28 1978-10-25
DE2723081C2 (en) * 1976-06-02 1982-12-30 Mita Industrial Co., Ltd., Osaka, Jp
DE2739033C3 (en) * 1977-08-27 1981-09-10 Maschinenbau Ing.H. Stegenwalner, 1000 Berlin, De
JPS5479042A (en) * 1977-12-06 1979-06-23 Canon Inc Image forming device
US4264188A (en) * 1978-05-31 1981-04-28 Canon Kabushiki Kaisha Control for multiple-mode copying apparatus
DE3153482C2 (en) * 1980-10-17 1990-07-26 Canon K.K., Tokio/Tokyo, Jp

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284080A (en) * 1964-07-09 1966-11-08 Sperry Rand Corp Document feeder with delayed pulse generator control
US3482912A (en) * 1967-05-17 1969-12-09 Scm Corp Duplicating mechanism
US3521880A (en) * 1968-12-30 1970-07-28 Honeywell Inc Processing station with document handling and aligning means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284080A (en) * 1964-07-09 1966-11-08 Sperry Rand Corp Document feeder with delayed pulse generator control
US3482912A (en) * 1967-05-17 1969-12-09 Scm Corp Duplicating mechanism
US3521880A (en) * 1968-12-30 1970-07-28 Honeywell Inc Processing station with document handling and aligning means

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970384A (en) * 1972-01-25 1976-07-20 Canon Kabushiki Kaisha Safety device for photocopying machine
US4662740A (en) * 1972-04-13 1987-05-05 Canon Kabushiki Kaisha Electrophotographic device
US3790158A (en) * 1972-05-22 1974-02-05 Xerox Corp Automatic document handler
US3948586A (en) * 1972-11-02 1976-04-06 Canon Kabushiki Kaisha Jam detecting device in a copying machine
US3926429A (en) * 1972-12-02 1975-12-16 Ricoh Kk Copy sheet stripping device
US3819266A (en) * 1972-12-05 1974-06-25 Xerox Corp Copier jam protection
US4030409A (en) * 1973-01-26 1977-06-21 Addressograph Multigraph Corporation Printing apparatus controls
US3948510A (en) * 1973-11-19 1976-04-06 Ricoh Co., Ltd. Sheet jam detector for electrophotographic copying machine
US3999851A (en) * 1973-12-21 1976-12-28 Canon Kabushiki Kaisha Antijamming safety device for copying machine
DE2460616A1 (en) * 1973-12-21 1975-07-03 Canon Kk Clamping interference suppressor for a kopiergeraet
US3920328A (en) * 1974-07-24 1975-11-18 Pitney Bowes Inc Adjustable paper jam responsive device for an electrostatic copier
US4166615A (en) * 1974-12-27 1979-09-04 Sharp Kabushiki Kaisha Means for determining difference in copy sheet transportation states for an electrostatic reproduction machine
JPS51112544U (en) * 1975-03-07 1976-09-11
JPS5414380Y2 (en) * 1975-03-07 1979-06-14
US4084900A (en) * 1975-12-12 1978-04-18 Minolta Camera Kabushiki Kaisha Jam detecting device in the electrophotographic copying machine
JPS5272233A (en) * 1975-12-12 1977-06-16 Minolta Camera Co Ltd Detector for paper jam in the electrophotographic copying machine
JPS5545903B2 (en) * 1975-12-12 1980-11-20
US4022460A (en) * 1976-02-05 1977-05-10 Pitney-Bowes, Inc. Document jam detector for copier
JPS539532A (en) * 1976-07-14 1978-01-28 Kopia Kk Paper jam detector
JPS5416104B2 (en) * 1976-07-14 1979-06-20
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
US4281244A (en) * 1978-06-17 1981-07-28 Minolta Camera Kabushiki Kaisha Apparatus for detecting sheet-formed support material
US4275879A (en) * 1979-10-03 1981-06-30 Tokyo Shibaura Denki Kabushiki Kaisha Abnormal feed condition-detecting apparatus for a printing device
US4320961A (en) * 1980-01-28 1982-03-23 Nashua Corporation Jam detecting apparatus and method for electrostatic copier
US5008712A (en) * 1980-10-17 1991-04-16 Canon Kabushiki Kaisha Variable magnification copying apparatus and automatic shutdown therefor
EP0104087A3 (en) * 1982-09-21 1984-07-18 Xerox Corporation Sheet transport
EP0104087A2 (en) * 1982-09-21 1984-03-28 Xerox Corporation Sheet transport
US5068693A (en) * 1989-06-05 1991-11-26 Fujitsu Limited Sheet path sensor provided in an electrophotographic image forming apparatus
US20040046314A1 (en) * 2002-09-09 2004-03-11 Fuji Xerox Co., Ltd Image forming apparatus
US7293768B2 (en) * 2002-09-09 2007-11-13 Fuji Xerox Co., Ltd. Image forming apparatus

Also Published As

Publication number Publication date Type
DE2103587A1 (en) 1971-08-12 application
DE2103587B2 (en) 1977-02-10 application

Similar Documents

Publication Publication Date Title
US3603680A (en) Ultrasonic paper detection
US3540025A (en) Ice detector
US3611982A (en) Development electrode control apparatus
US3225191A (en) Infrared liquid level inspection system
US3409885A (en) Smoke detection apparatus
US3185851A (en) Photocell controlled anti-ejection circuit for an article handling apparatus
US3310304A (en) Sheet feed deflector and interrupter responsive to photoelectric sheet position sensing means
US4184366A (en) Coin testing apparatus
US3235738A (en) Photoelectric apparatus for detecting objects in an area
US5291245A (en) Photoreceptor belt seam detection and process control
US4161644A (en) Electrophotographic apparatus comprising improved thermal fixing means
US2016036A (en) Photo-electric system
US2570288A (en) Photoelectric inspection of sheet materials
US5291020A (en) Method and apparatus for detecting direction and speed using PIR sensor
US3782543A (en) Document recognition systems
US5971388A (en) Automatic original document feeding device which has different procedures for correcting paper jams depending on where the jam occurs
US3805061A (en) Object detecting apparatus
US4167949A (en) Coin jamming detecting device in coin sorting machine
US5138178A (en) Photoelectric paper basis weight sensor
US5056644A (en) Coin analyzer system and apparatus
US4077709A (en) Transfer charge control system
US4338020A (en) Device for detecting the size of the material to be copied in copying machines
US3856414A (en) Apparatus for inspecting strip material
US4884672A (en) Coin analyzer system and apparatus
US2561197A (en) Television inspection system