US3692408A - Energizing circuit for a duplicating machine - Google Patents

Energizing circuit for a duplicating machine Download PDF

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Publication number
US3692408A
US3692408A US97120A US3692408DA US3692408A US 3692408 A US3692408 A US 3692408A US 97120 A US97120 A US 97120A US 3692408D A US3692408D A US 3692408DA US 3692408 A US3692408 A US 3692408A
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United States
Prior art keywords
lamp
heater
power source
unidirectional conductive
voltage
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Expired - Lifetime
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US97120A
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English (en)
Inventor
Kitamaro Nakamura
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Minolta Co Ltd
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Minolta Co Ltd
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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
    • G03B27/16—Illumination arrangements, e.g. positioning of lamps, positioning of reflectors
    • 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

Definitions

  • the present invention relates to a circuit for energizing a lamp and a heater in a copying machine and more particularly'a circuit for energizing the lamp and the heater alternately on different half cycles of the AC power source.
  • a copying machine is provided with a light source for exposure of the original, a heater for drying and fixing the copy, and a motor driving source, and in addition a circuit for controlling the machine.
  • the major part of the power for the copying machine is consumed by the heater and the lamp.
  • the lamp is lit only at the time of exposure.
  • the heater is always energized in order to keep it ready and at the time of exposure the consumption power of the lamp and the consumption power of the heater and the other circuits are added together to form the peak consumption power.
  • the consumption power of the lamp and the heater has a tendency to remarkably increase. Further, in the case wherein a commercial power source is put to use the peak consumption current of the copying machine approaches the limit of the current output thereof, thereby preventing further speeding up of the copying machine.
  • One object of the present invention is to provide an energizing circuit for a lamp and a heater in a copying machine, which in order to remove the prior drawbacks mentioned above effects a very short intermittent feed at the different half cycles of the AC power source to the lamp and the heater and prevents the peak value of the consumption current from running to excess while lighting simultaneously the lamp and heater.
  • Another object of the present invention is to provide an energizing circuit for a lamp and a heater in a copying machine, which controls the current to the lamp and the heater at different half cycles of the AC power source by means of a silicon control rectifier such as Thyristor or Triac, and facilitates the variation adjustment of current by altering the current phase angle.
  • a silicon control rectifier such as Thyristor or Triac
  • Another object of the present invention is to provide an energizing circuit for a lamp and a heater in a copying machine, which controls the current phase angle to the lamp and the heater at different half cycles of the AC power source by means of a silicon control rectifier, and lights the lamp and preheats the heater at the time of exposure, and when the exposure is not operative preheats the heater so as to facilitate the shift of the heater to a constant heating state, and at the same time preheats the lamp to prevent the filament from breaking and prolongs the life of lamp especially in the case of where a halogen lamp is put to use as a light source lamp.
  • the present invention provides an energizing circuit for a lamp and a heater in a copying machine, which connects the lamp and the heater to an AC power source having a voltage higher than the rated voltage of the lamp and heater, and controls the current from the power source respectively to the lamp and the heater by means of a silicon control rectifier.
  • the silicon control rectifier controls the phase of the AC power source for feeding the rated current or a larger current to the lamp and the heater so as to be respectively of a different phase.
  • FIG. I shows an energizing circuit of an embodiment in accordance with the present invention.
  • FIG. 2a and 2b show the wave forms of the voltage in that embodiment, wherein FIG. 2a shows the wave form of the voltage impressed on the lamp and FIG. 2b shows the wave form of the voltage impressed on the heater.
  • FIG. 3 shows an energizing circuit of another embodiment in accordance with the present invention.
  • FIGS. 4a, 4b, and 40 show the wave forms of the voltages impressed on the lamp and the heater in the embodiment of FIG. 3, wherein FIGS. 4a, 4b and 40 show respectively the wave form of the voltages and the respective variation of the conduction angle.
  • FIG. 5 shows an energizing circuit of a third embodiment in accordance with the present invention.
  • FIG. 6 shows an energizing circuit of a fourth embodiment in accordance with the present invention.
  • FIGS. 7a and 7b show wave forms of the voltage at the time when the lamp filament is preheated and the heater is heated in the embodiment of FIG. 6, wherein FIG. 7a shows the wave form of the voltage impressed on the lamp and FIG. 7b shows the wave form of the voltage impressed on the heater.
  • FIGS. 8a and 8b show wave forms of the voltage at the time when the lamp is fully lit and the heater is preheated in the embodiment of FIG. 6, wherein FIG. 8a shows the wave form of the voltage impressed on the lamp and FIG. 8b shows the wave form of the voltage impressed on the heater.
  • FIG. 1 shows the first embodiment in accordance with the present invention, wherein to power source 1 lamp 3 and heater 4 are connected in series through power switch 2.
  • the voltage of power source 1 is higher than the rated voltages E,, E of lamp 3 and heater 4.
  • Thyristor 5 To lamp 3 Thyristor 5, is connected in parallel for short-circuiting lamp 3, and to heater 4 Thyristor 5 is connected in series in the reverse direction of Thyristor 5, for short-circuiting heater 4. And, to Thyristors 5,, 5 RC circuits are provided in parallel for controlling the conduction and non-conduction of both Thyristors. That is, to Thyristor 5 a circuit composed of resistance 8, and condenser 9, is connected in parallel and to Thyristor 5 a circuit composed of resistance 8 and condenser 9 is connected in parallel. RC nodes m, n of both RC circuits are respectively connected to changeover contacts 7a, 7b of change-over switch 7, and change-over switch 7 is connected to change-over switch 6.
  • One change-over contact 6a of change-over switch 6 is connected to the gate of Thyristor 5, and the other change-over contact 6b is connected to the gate of Thyristor 5 and both change-over switches are arranged so that when change-over switch 7 is connected to the change-over contact 7a side by means of connection member 10 change-over switch 6 is connected to change-over contact 6a, and when change-over switch 7 is connected to the change-over contact 7b side change-over switch 6 is change-over to contact 6b.
  • change-over switch 7 when change-over switch 7 is connected to the contact 70, change-over switch 6 is connected to contact 6a by connection member 10 and the voltage of node in is impressed on the gate of Thyristor 5,, and when the m side of condenser 9, is charged, Thyristor 5, is activated, and when the in side of condenser 9, is charged on the reverse half cycle Thyristor 5, becomes non-conductive.
  • Thyristor 5 When Thyristor 5, is activated lamp 3 is short-circuited and on heater 4 the power source voltage E is impressed, and when Thyristor is nonconductive, lamp 3 and heater 4 connected in series to each other the power source voltage is impressed and accordingly lamp 3 is preheated by the voltage shown by g in FIG. 2a and heater 4 is heated by the voltage shown by g in FIG. 2b.
  • the effective value voltage to be impressed is E, it is known that light output from the lamp increases in proportion to (E /E,)" from (E /E0 If for example, E, l 10 V, the AC power source and voltage to be applied are 220 V, and if the half-wave voltage is applied to lamp 3, the effective voltage E is 157 V. Results of experiments show that the brightness of the lamp is l 57/ l l0) 4L where X 4. When the effective voltage of the wave form shown by f in FIG. 2a is higher than the rated voltage of lamp 3 the quantity of light emitted from the lamp can be remarkably increased.
  • the voltage over the rated voltage of the lamp is impressed on the lamp, however, that voltage is impressed at the half-wave phase of the power source voltage instantaneously, so that the lamp filament is not damaged.
  • the possible copying number in the duration of the life time of the lamp is not substantially decreased.
  • the voltage of power source 1 is boosted to about twice the voltage of the lamp and the heater to be used, by means of transformer l1, and to the secondary circuit of transformer 11 a series circuit of lamp 3 and Thyristor 5,, and a series circuit of heater 4 and Thyristor 5 are connected in parallel, and both Thyristors 5,, 5 are inserted so as to conduct in the reverse direction.
  • a phase control circuit composed of variable resistance 8, and condenser 9 is connected in parallel, and RC node in is connected to the gate of Thyristor 5, through switch 12, and in the same way RC node n of another phase control circuit composed of variable resistance 8 and condenser 9 connected in parallel with Thyristor 5 is connected to the gate of Thyristor 5 through switch 12 Therefore, lamp 3 and heater 4 are energized by the half-wave having respectively one half cycle phase difference of AC power source 1 as shown-in FIG. 4, and that energization is phase-controlled by the control circuit. Therefore, by controlling properly variable resistances 8,, 8 the conduction phase angle can be varied as shown in FIG. 4a, b and 0. FIG.
  • FIG. 4a shows the state wherein the lamp and the heater are given about one-fourth phase angle conduction, and the effective voltage is remarkably dropped, and thereby the lamp and the heater are preheated.
  • FIG. 4b shows the state wherein the lamp and heater are fed with an excess voltage
  • FIG. 40 shows the state wherein the lamp is fed weakly and the heater is fed with an excess voltage.
  • phase adjustment can be done by variable resistances 8,, 8 so that the temperature rise of the heater at the beginning of use can be speeded up and the drying efficiency can be adjusted in relation to the ambient temperature.
  • the voltage of power source 1 is boosted by transformer 11 and in the secondary circuit of transformer 11 Triac 14 is inserted, and to Triac 14 a circuit composed of switch 13,, lamp 3, and rectifier 5,, and a circuit composed of switch 13 heater 4, and rectifier 5 are connected in parallel with each other, and rectifiers 5, and 5 are connected in reverse directions of conduction, and Triac 14 can be controlled by trigger transformer 15.
  • phase control circuit can be used as shown in the second embodiment described above.
  • switches 13, and 13 are closed and turned on, current is fed into heater 4 by rectifiers 5, and 5 in the course of the positive half wave of the power source and also into lamp 3 in the course of the negative half wave. If switch 13 is opened and switch 13, is closed, the lamp only can be lighted by the half wave. If switch 13, is opened and switch 13 is closed, heater 4 can be heated by the half wave.
  • the lighting voltage wave form is as shown in FIG. 4b.
  • lamp 3 and Triac 14 are connected in parallel, and heater 4 and Triac 14 are connected in parallel, and both are connected in series to power source 1 and power switch 2.
  • Triac 14, is provided with a trigger circuit composed of resistance 8, and condenser 9, and Triac 14 is provided with another trigger circuit composed of variable resistance 8 and condenser 9 and capable of Changing the trigger time, and from the node of both parallel elements both trigger circuits are changed over to connect by switch 16 through contacts 16a, 16b.
  • Both Triacs 14,, 14 are energized by the discharge of condenser 9, or 9 in an appropriate trigger circuit when switch 16 is connected to contact 16a or 16b in the trigger circuit.
  • the trigger circuit for Triac 14 can change the discharge time of condenser 9 by adjusting variable resistance 8
  • switch 16 a timing switch is put to use, for example, when the power switch is closed, switch 16 is connected to contact 16a and when the original copy is delivered to the exposure portion switch 16 is changed over to contact 16b, and after the original copy is irradiated for a certain time switch 16 is returned again to contact 16a.
  • Triac 14 for which switch 16 is opened is non-conductive as well as Triac 14, for which switch 16 is closed, so that lamp 3 and heater 4 are preheated with a low voltage for the time shown by t, in FIGS. 7a, b.
  • time t elapses condenser 9, discharges and Triac 14, is energized because its gate is turned ON, and lamp 3 is short-circuited and the whole power voltage is impressed on heater 4 and accordingly heater 4 is heated.
  • Triac 14 becomes non-conductive again, and lamp 3 and heater 4 are preheated with a low voltage.
  • Triac 14 holds always a nonconductive state and Triac 14 is energized whenever condenser 9 is discharged after time t, elapses. These operations are repeated each half-wave of the power wave form so that lamp 3 is lit with the voltage shown in FIG. 8a and heater 4 is energized to preheat with the low voltage shown in FIG. 8b.
  • discharge time t of condenser 9 is changed and the effective value of the voltage impressed in lamp 3 is changed and accordingly the brightness of lamp 3 can be changed.
  • timing switch 16 is changed over again to the contact 16a.
  • the lamp and the heater are simultaneously fed so as to prevent the peak consumption current and the lamp and the heater are always preheated, so that there is no breaking of filaments due to an abrupt feed. And when a halogen lamp is put to use the lamp holds the halogen cycle by means of the remaining heat to prolong the life of the lamp and the constant pre-heating state of the heater can be rapidly effected.
  • a circuit for energizing at least one lamp and at least one heater from an AC power source in a copying machine comprising:
  • first and second unidirectional conductive switch means connected to conduct current from respective half cycles from said AC power source, said first unidirectional conductive means connecting said AC power source with said at least one lamp and said second unidirectional conductive means connecting said AC power source to said at least one heater; means for controlling the excitation of said first and second unidirectional conductive means;
  • a circuit as in claim 1 wherein said means for switching may be positioned to independently energize said at least one heater or said at least one lamp, said means for switching is positioned to simultaneously fully energize said at least one lamp and said at least one heater, and said means for switching further includes means for varying the instant of energization of said at least one lamp and said at least one heater during a respective half cycle of said AC power source.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Fixing For Electrophotography (AREA)
US97120A 1969-12-12 1970-12-11 Energizing circuit for a duplicating machine Expired - Lifetime US3692408A (en)

Applications Claiming Priority (1)

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JP44099402A JPS511970B1 (enrdf_load_stackoverflow) 1969-12-12 1969-12-12

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US3692408A true US3692408A (en) 1972-09-19

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JP (1) JPS511970B1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898006A (en) * 1973-09-03 1975-08-05 Canon Kk Exposure lamp control device
US4063813A (en) * 1975-07-24 1977-12-20 Fuji Xerox Co., Ltd. Method for exposing a light sensitive member
US4113375A (en) * 1975-11-13 1978-09-12 Minolta Camera Kabushiki Kaisha Power regulating device for controlling exposing means and fixing means in electrophotographic copying apparatus
US4193679A (en) * 1976-08-24 1980-03-18 Ricoh Company, Ltd. Electrophotographic apparatus comprising improved imaging system
US5627634A (en) * 1988-12-15 1997-05-06 Canon Kabushiki Kaisha Image fixing apparatus having a heater energized and controlled by electric energy

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0333823U (enrdf_load_stackoverflow) * 1989-08-10 1991-04-03

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148610A (en) * 1964-09-15 Contact printing apparatus
US3288047A (en) * 1965-03-29 1966-11-29 Lumonrint Zindler K G Apparatus for exposing and developing sensitive sheets

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148610A (en) * 1964-09-15 Contact printing apparatus
US3288047A (en) * 1965-03-29 1966-11-29 Lumonrint Zindler K G Apparatus for exposing and developing sensitive sheets

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898006A (en) * 1973-09-03 1975-08-05 Canon Kk Exposure lamp control device
US4063813A (en) * 1975-07-24 1977-12-20 Fuji Xerox Co., Ltd. Method for exposing a light sensitive member
US4113375A (en) * 1975-11-13 1978-09-12 Minolta Camera Kabushiki Kaisha Power regulating device for controlling exposing means and fixing means in electrophotographic copying apparatus
US4193679A (en) * 1976-08-24 1980-03-18 Ricoh Company, Ltd. Electrophotographic apparatus comprising improved imaging system
US5627634A (en) * 1988-12-15 1997-05-06 Canon Kabushiki Kaisha Image fixing apparatus having a heater energized and controlled by electric energy

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Publication number Publication date
JPS511970B1 (enrdf_load_stackoverflow) 1976-01-22

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