US3817515A - Device for correcting the misalignment of the original copy and copying paper of a duplicator - Google Patents

Device for correcting the misalignment of the original copy and copying paper of a duplicator Download PDF

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Publication number
US3817515A
US3817515A US00007199A US719970A US3817515A US 3817515 A US3817515 A US 3817515A US 00007199 A US00007199 A US 00007199A US 719970 A US719970 A US 719970A US 3817515 A US3817515 A US 3817515A
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US
United States
Prior art keywords
roller
copying paper
motor
voltage
original
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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
US00007199A
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English (en)
Inventor
S Kanda
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.)
Ricoh Co Ltd
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Ricoh Co Ltd
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Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
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Publication of US3817515A publication Critical patent/US3817515A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/02—Exposure apparatus for contact printing
    • G03B27/14—Details

Definitions

  • a feed system for a duplicator for the feeding of on'ginal and copying paper A DC motor is provided for feeding the original and detecting means are provided 'for detecting the passage of the leading and trailing edges of the original past a given point.
  • a feeding roller for the copying paper is also coupled to the DC motor.
  • a pivoted member has a roller on one end opposed to the feed roller, and a roller on the other end opposed to a compensating roller for adjusting the position of a copying paper. The pivoted member is actuated by detection of the leading edge of the original past the point to move in a direction to effect the feeding of the copying paper by the feed roller.
  • the pivoted member Upon detection of the trailing edge of the original, the pivoted member is moved to enable adjustment of position of a copying paper by the compensating roller.
  • the compensating roller is driven by a DC balancing motor, the balancing motor being driven by a voltage corresponding to the difference between the armature voltage of the DC drive motor and the voltage at a tap of a potentiometer.
  • the position of the tap is controlled by the balancing motor, so that the balancing motor only operates when the voltage at the tap is different than the voltage at the armature of the DC drive motor.
  • the present invention relates to a duplicator, and more in particular the present invention relates to the device for correcting the misalignment of the original copy and the copying paper in a duplicator wherein the copying paper is laid on the original copy and is exposed.
  • the copying paper in order to prevent the misalignment between the original copy and the copyingpaper, the copying paper must be set in advance by the length equal to the predicted misalignment.
  • misalignment is in creased as the travelling speed of the original copy and the copying paper is increased.
  • the present invention has been attained with a view to satisfying the above mentioned demand.
  • one of the objects of the present invention is to provided, a device for automatically adjusting the position of copying papers in accordance with the copying speed in such a manner that the misalignment of the original copy and the copying papers should not be brought about.
  • Another object of the present invention is to economically provide a device whose structure is simple for correcting the misalignment of the original copy and the copying paper.
  • the position where the copying paper is set by the rollers interlocked to the DC balancing motor is provided by driving the balance DC electric motor by the differential voltage between the armature voltage of the electric motor for driving the respective rollers for carrying the original copy and the copying papers, and the voltage of the slide contact of the potentiometer to which the constant voltage is supplied.
  • the position is corrected in accordance with the copying speed.
  • the magnitude and the polarity of the above mentioned differential voltage are detected by a phase sensitive circuit, and the DC balancing electric motor is driven in accordance with the magnitude and the polarity thereof.
  • the roller for correcting the misalignment of the original copy and the copying paper is mechanically interlocked to the DC balancing motor, and the position of the copying paper having been set as far as the position of the said roller, is automatically corrected in advance.
  • the copying paper can be further advanced when the copying speed is relatively higher.
  • the slide contact of the potentiometer is mechanically interlocked to the above mentioned DC balancing motor and is moved, and the electric motor is stopped at the position when the voltage of the slide contact becomes equal to the voltage of the armature. Therefore, the DC balancing motor and the correction roller are rotated in accordance with the predetermined copying speed, and the copying paper is automatically set in advance at the position corresponding to the copying speed.
  • FIG. 1 shows the main portion of the duplicator having the correction device of the present invention
  • FIG. 2 shows the relation of the respective members of the device of the present invention.
  • feed-roller 2 is provided in a punched hole la of an original copy guiding plate 1, and a press-roller 3 is press-contacted against the feed-roller 2.
  • An operation member 4a of a 4 is provided in a punched hole lb of the original copy guiding plate 1.
  • a rod 12 is provided on the main body of the device rotatably by means of a pin 11, and on both ends thereof, press-rollers 13, 14 are supported respectively a against feed-roller 6 and an adjustment roller 8.
  • Iron piece 15 is fixed on the opposite side of the pressroller 14, with respect to adjustment roller 8 of the rod 12, and a solenoid 16 is operated by means of a microswitch that is fixed on the main body of the device.
  • a device 17 for feeding copying papers is provided on one end of the copying paper guiding plate 5. On the crossing point of the original copy guiding plate 1 and the copying paper guiding plate 5, the interval 1C is provided.
  • the feed rollers 2 and 6 are respectively driven by the DC electric motor 7.
  • DC balancing motor 9, copying paper correcting roller 8 and the slide contact of the potentiometer 10 are mechanically interlocked.
  • FIG. 2 shows schematically electrical circuit features of the device of the present invention.
  • 18 is a smoothing circuit
  • 19 is a DC-AC converting circuit
  • 20 is an amplifier circuit
  • 21 is a phase sensitive circuit
  • 22 is the slide contact of the potentiometer 10.
  • the constant circuit 23 stabilizes the output voltage of the electric source circuit 24.
  • the copying paper 26 moves to the left over the guide plate 5, and the end thereof is carried to the exposing device (not shown) in such a state that the front end thereof is laid over the original copy so as to be aligned with with the front end of the original copy 25 at the interval lc.
  • the feeding devices other than 2,3 and 6.13 are omitted from the diagram for the sake of convenience.
  • the rod 12 is also rotated in the counter clockwise direction by means of a spring force thereof, and the press-roller 13 is separated from the copying paper 26 on the feed-roller 6, and at the same time, the pressroller 14 pinches the end of the copying paper 26 between the adjustment roller and said press-roller 14.
  • the time lag from the time when the front end of the original copy 25 is detected to the time when the press-roller 13 press-contacts the copying paper 26 against the feed-roller 6, and the time lag from the time when the rear end of the original copy 25 is detected to the time when the press-roller 14 presscontacts the copying paper 26 against the adjustment roller 8, should be equal.
  • the reason for this is that when the two time lags are not equal, misalignment is gradually brought about between the original copy and the copying paper.
  • the duplicator When the duplicator is set at a predetermined copying speed, the corresponding armature voltage of DC electric motor 7 is determined. This voltage is smoothed by the smoothing circuit 18, and is applied to the DC-AC converting circuit 19 along with the voltage from the slide contact 22 of the potentiometer 10.
  • the differential voltage of the two DC voltages is converted into alternating current, and is amplified by AC amplifying circuit 20 and the polarity of said differential voltage is detected by the synchronizing rectifier circuit 21, and accordingly the balance DC electric motor 9 revolves.
  • the slide contact 22 of the potentiometer 10 is mechanically interlocked to the above mentioned DC balancing motor 9, and is moved along with said electric motor, and is stopped when said two DC voltages are made equal.
  • the adjustment roller 8 is interlocked to the balance DC electric motor 9, and is rotated by the motor, and therefore the copying paper 22 is set at the position corresponding to the predetermined copying speed.
  • the position of the copying paper 26 can be automatically adjusted in accordance with the newly set copying speed.
  • a feed system for a duplicator for feeding original and copying paper comprising a DC motor, means coupled to said DC motor for feeding said original, means for detecting the passage of the leading and trailing edges of said original past a given point, a feed roller for said copying paper coupled to said DC motor, a compensating roller positioned to engage said copying paper, a DC balancing motor, a potentiometer having a tap, means applying a constant voltage to said potentiometer, means applying a voltage corresponding to the difference voltage between the voltage on said tap and the armature voltage of said first mentioned DC motor to said balancing motor, said balancing motor being mechanically coupled to said tap whereby said balancing motor operates only when said difference voltage exists, means mechanically coupling said balancing motor to said compensating roller said compensating roller being adjusted through said mechanical coupling upon change of speed of said first mentioned DC motor to adjust the position of said copying paper, and means for selectively effecting drive of said copying paper responsive to detection of the leading edge of said original whereby said copy

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
US00007199A 1969-02-01 1970-01-30 Device for correcting the misalignment of the original copy and copying paper of a duplicator Expired - Lifetime US3817515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44007477A JPS4837093B1 (enrdf_load_stackoverflow) 1969-02-01 1969-02-01

Publications (1)

Publication Number Publication Date
US3817515A true US3817515A (en) 1974-06-18

Family

ID=11666839

Family Applications (1)

Application Number Title Priority Date Filing Date
US00007199A Expired - Lifetime US3817515A (en) 1969-02-01 1970-01-30 Device for correcting the misalignment of the original copy and copying paper of a duplicator

Country Status (6)

Country Link
US (1) US3817515A (enrdf_load_stackoverflow)
JP (1) JPS4837093B1 (enrdf_load_stackoverflow)
DE (1) DE2004352C3 (enrdf_load_stackoverflow)
FR (1) FR2033790A5 (enrdf_load_stackoverflow)
GB (1) GB1236182A (enrdf_load_stackoverflow)
NL (2) NL7001374A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204668A (en) * 1977-05-17 1980-05-27 Ricoh Company, Ltd. Paper feeding apparatus
DE3027146A1 (de) * 1979-07-23 1981-02-12 Konishiroku Photo Ind Vorlagen-eingabevorrichtung fuer ein kopiergeraet
US4299380A (en) * 1977-03-09 1981-11-10 Ricoh Company, Ltd. Sheet feed apparatus
US4337935A (en) * 1979-05-24 1982-07-06 Canon Kabushiki Kaisha Copying apparatus having a manual insertion paper feeding mechanism
US4438917A (en) * 1981-10-16 1984-03-27 International Business Machines Corporation Dual motor aligner
US4451136A (en) * 1979-12-13 1984-05-29 Canon Kabushiki Kaisha Feed control for copying apparatus
US4455080A (en) * 1980-11-04 1984-06-19 Minolta Camera Kabushiki Kaisha Copying apparatus equipped with control device
US4506978A (en) * 1983-07-01 1985-03-26 Xerox Corporation Document registration system
US5192071A (en) * 1988-11-18 1993-03-09 Mita Industrial Co., Ltd. Image-forming apparatus provided with automatic original delivery mechanism and carrier sheet for use in said apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279787A (en) * 1964-06-22 1966-10-18 Frederick Post Co Sheet-feeding method and apparatus
US3475093A (en) * 1967-01-25 1969-10-28 Dick Co Ab Feed mechanism for photocopy machine or the like

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279787A (en) * 1964-06-22 1966-10-18 Frederick Post Co Sheet-feeding method and apparatus
US3475093A (en) * 1967-01-25 1969-10-28 Dick Co Ab Feed mechanism for photocopy machine or the like

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299380A (en) * 1977-03-09 1981-11-10 Ricoh Company, Ltd. Sheet feed apparatus
US4204668A (en) * 1977-05-17 1980-05-27 Ricoh Company, Ltd. Paper feeding apparatus
US4337935A (en) * 1979-05-24 1982-07-06 Canon Kabushiki Kaisha Copying apparatus having a manual insertion paper feeding mechanism
DE3027146A1 (de) * 1979-07-23 1981-02-12 Konishiroku Photo Ind Vorlagen-eingabevorrichtung fuer ein kopiergeraet
US4523752A (en) * 1979-07-23 1985-06-18 Konishiroku Photo Industry Co., Ltd. Original document inserting device for copying apparatus
US4451136A (en) * 1979-12-13 1984-05-29 Canon Kabushiki Kaisha Feed control for copying apparatus
US4455080A (en) * 1980-11-04 1984-06-19 Minolta Camera Kabushiki Kaisha Copying apparatus equipped with control device
US4438917A (en) * 1981-10-16 1984-03-27 International Business Machines Corporation Dual motor aligner
US4506978A (en) * 1983-07-01 1985-03-26 Xerox Corporation Document registration system
US5192071A (en) * 1988-11-18 1993-03-09 Mita Industrial Co., Ltd. Image-forming apparatus provided with automatic original delivery mechanism and carrier sheet for use in said apparatus

Also Published As

Publication number Publication date
NL7001374A (enrdf_load_stackoverflow) 1970-08-04
FR2033790A5 (enrdf_load_stackoverflow) 1970-12-04
DE2004352C3 (de) 1974-03-14
GB1236182A (en) 1971-06-23
NL146608C (enrdf_load_stackoverflow)
JPS4837093B1 (enrdf_load_stackoverflow) 1973-11-09
DE2004352A1 (de) 1970-08-27
DE2004352B2 (de) 1973-07-19

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