KR20010048868A - Apparatus for free voltage of fixations device - Google Patents

Abstract

PURPOSE: A device for using rated voltage in common of a fusing unit is provided to receive 110V and 220V rated voltages simultaneously by using one halogen lamp, by adjusting duty ratio of alternating current input power supply input according to the level of the alternating current voltage. CONSTITUTION: A device for using rated voltage in common of a fusing unit includes a voltage level detection part(215) detecting the voltage level of alternating current input power supply(213), a controller(217) outputting control signals different in duty ratio according to the voltage level, a fusing control part(218) controlling the state that alternating current voltage is supplied to a halogen lamp(216) according to the control signal outputted from the controller, wherein the controller controls time when the alternating current input voltage is supplied to the halogen lamp to equalize total quantity of power supply according to the level of the alternating current input voltage.

Description

Rated voltage common device of fuser unit {APPARATUS FOR FREE VOLTAGE OF FIXATIONS DEVICE}

The present invention relates to a rated voltage common device of a fuser, and more particularly, in a fuser employing a temperature control method, 110 [V] and 220 [V] can be used simultaneously for the rated voltage of a halogen lamp configured in the fuser. It relates to a rated voltage common device of a fuser unit.

In general, the electrophotographic developing method refers to a method of moving a toner attached to a photosensitive member to a recording paper by using an electric field. In the electrophotographic developing method using a conventional dry toner, the toner on the photosensitive member is transferred to the recording paper with electrostatic force. Corona charger method and bias roller method are available.

The bias roller method is advantageous in miniaturization because the circumference of the transfer roller is in contact with the photosensitive member, and mechanically pressurizes the back surface of the recording sheet in contact with the photosensitive member to provide excellent adhesion and various configurations of the transfer structure of the recording sheet. In addition, since the transfer roller and the photoreceptor are in contact with each other, electrical efficiency can be obtained and the applied voltage can be lowered. Since it is not a discharge method, ozone is not generated, and transfer efficiency is excellent and a high quality output image can be obtained.

The bias rollers generally have an electroconductive soft roller method using a semiconductive sponge in contact with the back surface of a photosensitive member or a recording paper, and an ion conductive hard roller method using a semiconductive rubber.

At this time, in an electrophotographic image forming apparatus (printer, digital copier, etc.), a fixing apparatus for fixing an image transferred on a recording sheet is essentially required. Typically, the fixing unit is composed of a halogen roller and a heating roller for heating the toner, which is heated by a power source and conducted to the recording paper, and a compression roller for fixing by pressing the toner heated by the heating roller onto the recording paper while rotating in contact with the heating roller. do.

According to the general operating state, when initially driving the image forming apparatus, a warm-up operation is performed until the fixing unit can reach a constant temperature. Then, after the temperature of the fixing unit rises above a certain temperature, when a printing operation is performed, the temperature controller turns on / off the halogen lamp so that the temperature of the fixing unit is maintained at a constant level.

On the other hand, because the rated voltage used by each country is different, the consumer must purchase a device corresponding to the rated voltage separately, or purchase a power transformer or a device that can use each rated voltage at the same time. This phenomenon is similarly applied to an image forming apparatus. In the conventional image forming apparatus, a fixing unit in which a halogen lamp having a filament for 110 [V] and a 220 [V] is installed at the same time is used.

However, according to the conventional image forming apparatus, the following problem (s) occur.

That is, since a plurality of halogen lamps each having a built-in filament for each rated voltage must be installed in the fuser, a result is that a consumer needs to purchase an unnecessary halogen lamp in a state where the rated voltage is determined. The process is complicated.

Accordingly, the present invention is to solve such a problem (s), the object of the present invention is to use a single halogen lamp to simultaneously accommodate the rated voltage of 110 [V] and 220 [V] In providing a device.

1 is an embodiment of an image forming apparatus applied to the present invention is a system configuration in conjunction with a printer and a computer,

FIG. 2 is a schematic internal configuration diagram of the printer shown in FIG. 1;

3 is a schematic block diagram of a rated voltage common device of a fuser according to the present invention;

4 is a detailed circuit diagram of FIG.

5 is a current waveform diagram at 110 [V] and 220 [V].

<Description of the code | symbol about the principal part of drawing>

200: printer 207: fuser unit

213: AC input power 214: Filter part

215: voltage level detector 216: halogen lamp

217: controller 218: fixing control unit

219: triac 220: photo coupler

Vcc: constant voltage R1, C1: filter

R2, R3: voltage divider

A feature of the present invention for achieving the object (s) includes a fuser with a built-in halogen lamp, the halogen lamp is heated to the fixing temperature by the AC input power supplied to the halogen lamp to perform the fixing operation. An image forming apparatus comprising: a voltage level detector for detecting a voltage level of an AC input power source; A controller for outputting control signals having different duty ratios according to the voltage levels detected by the voltage level detection unit; A fixing control unit controlling a state in which an AC voltage supplied from an AC input power is supplied to the halogen lamp according to a control signal output from the controller; The controller is to control the time that the AC input voltage is supplied to the halogen lamp so that the total amount of power according to the voltage level of the input AC input voltage.

Here, the controller

It is preferable to control the AC input power to be supplied to the halogen lamp at the duty ratio as follows.

The voltage level detection unit may include a pair of voltage divider resistors for dividing the voltage level of the AC input power supply to a predetermined level, and detect a voltage divider voltage divided by the voltage divider resistor in the controller to detect the voltage level of the AC input voltage. It is preferable.

The fixing control unit may further include a triac for switching the AC voltage inputted by the voltage divided by the pair of voltage divider resistors to be supplied to the halogen lamp; A photocoupler comprising a photodiode for controlling the conduction state of the constant voltage according to a control signal supplied from the controller, and a port triac for controlling the supply state of the gate signal supplied to the triac by switching from the light emitted from the photodiode. It is preferable to include.

Hereinafter, exemplary embodiment (s) of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are displayed on different drawings. In addition, in the following description there are shown a number of specific details, such as components of the specific circuit, which are provided only to help a more general understanding of the present invention that the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a diagram illustrating a system configuration in which a printer and a computer are connected as an embodiment of an image forming apparatus applied to the present invention. FIG. 2 is a schematic diagram illustrating an internal configuration of the printer illustrated in FIG. 1. Fig. 4 shows a schematic block diagram of the rated voltage sharing apparatus of the fuser according to the present invention, Fig. 4 shows a detailed circuit diagram of Fig. 3, and Fig. 5 shows a current waveform diagram of 110 [V] and 220 [V]. Is shown.

First, the configuration of the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, the computer 100 and the printer 200 are connected through a printer cable 300. As the print data is transmitted from the computer 100, the printer 200 images the print data. Then print.

Meanwhile, as shown in FIG. 2, the printer 200 includes a pickup roller 201, a charging roller 202, an organic photoconductive (OPC) 203, for printing predetermined image data on a recording sheet. The transfer roller 204, the developing roller 205, the supply roller 206, the fixing unit 207, and the exposure apparatus 208 are comprised. That is, when the charging roller 202 charged by the high-voltage charging voltage rotates to evenly charge the photosensitive member applied to the outer circumferential surface of the photosensitive drum 203, the photosensitive drum 203 in which the light generated by the exposure apparatus 208 is charged is charged. The electrostatic latent image to be printed is formed on the surface. Thereafter, a potential difference occurs between the supply roller 206 supplied with the high voltage supply voltage and the developing roller 205 supplied with a voltage lower than the supply roller 206. Thus, the negative charge moves from the feed roller 206 to the developing roller 205. The toner supplied to the developing roller 205 is applied to an electrostatic latent image formed on the surface of the photosensitive drum 203 to form a visible image. The high pressure transfer roller 204 transfers the visible image formed by the toner applied to the surface of the photosensitive drum 203 to the recording paper 209 to be transferred. The visible image transferred to the recording paper 209 is fixed to the recording paper 209 by the high heat and pressure of the heating roller 210 and the pressing roller 211 constituted in the fixing unit 207, thereby completing the printing process.

At this time, the supply voltage, the developing voltage, the transfer voltage, and the charging voltage described above are continuously supplied to the supply roller 206, the developing roller 205, the transfer roller 204, and the charging roller 202 until the printing operation is completed. Supplied. Then, the heating roller 210 in the fixing unit 207 repeats the on / off state to maintain a constant temperature until the printing operation is completed.

In addition, a transfer transfer lamp 212 is provided between the developing roller 205 and the transfer roller 204 to scan the photosensitive drum 203 with light having a wavelength of 650 nm generated by the transfer transfer lamp 212. By lowering the potential of the toner applied to the photosensitive drum 203, the bonding force of the toner to the photosensitive drum 203 is lowered to improve the transfer efficiency.

On the other hand, the configuration of the rated voltage common device, as shown in Fig. 3 and 4, the filter unit 214 composed of a capacitor (C1) and a resistor (R1) to filter the noise component included in the AC input power source (213) And a voltage level detector 215 for detecting a voltage level of the AC voltage filtered by the filter unit 214, and an on / off signal of the halogen lamp 216 corresponding to the voltage level detected by the voltage level detector 215. Controller 217 for outputting the control unit and a fixing control unit 218 for controlling the supply state (duty ratio) of the AC power supplied to the halogen lamp 216 according to the on / off signal output from the controller 217. .

Here, the voltage level detecting unit 215 is composed of a pair of voltage divider resistors R2 and R3 for dividing the input AC voltage to a predetermined level, and the voltage divided by the pair of voltage divider resistors R2 and R3. The level is sensed by the controller 217 to sense the voltage level of the AC input power source 213.

In addition, the fixing control unit 218 is switched by the voltage divided by the voltage divider resistors R2 and R3, the triac 219 for switching the supplied AC voltage to the halogen lamp 216 and the controller 217. Port for controlling the supply state of the gate signal supplied to the triac 219 is switched by the photodiode and the light emitted from the photodiode to control the conduction state of the constant voltage (Vcc) according to the on / off signal supplied from It consists of a photo coupler 220 comprised of triacs.

Referring to Figure 5 with respect to the operation of the present invention having such a configuration as follows.

When power is initially supplied or a print command is received, the controller 217 performs a warming-up to raise the temperature of the fixing unit 207 to a predetermined level. That is, the controller 217 controls the fixing control unit 218 to supply an AC voltage to the halogen lamp 216, whereby the halogen lamp 216 is heated to raise the temperature of the fixing unit 207. Thereafter, when the fixing unit 207 rises to a predetermined temperature, the controller 217 repeatedly outputs an on / off signal to the fixing control unit 218 while sensing the temperature value of the fixing unit 207, whereby the fixing unit 207 is fixed. Control to maintain temperature.

At this time, as the controller 217 supplies the ON signal to the fixing controller 218 for a predetermined time, the constant voltage Vcc (eg, 24 [V]) supplied from the constant voltage source is supplied to the photodiode in the photo coupler 220. This causes the photodiode to turn on and emit light. Light emitted from the photodiode turns on the phototriac in the photo coupler 220.

Meanwhile, the AC power supplied from the AC input power 213 is filtered by the filter unit 214 including the capacitor C1 and the resistor R1 and then supplied to the phototriac in the photo coupler 220. do.

At this time, since the phototriac is turned on, the input AC voltage is divided by a pair of voltage divider resistors R2 and R3 to a predetermined level and provided to the phototriac in the photo coupler 220. At this time, when the phototriac is turned on, the potential at the point “A” has a constant potential. At this time, the potential at the point "A" depends on the level of the AC voltage input (that is, the rated voltage), and this potential is provided to the controller 217 to supply the potential at the corresponding point ("A") at the controller 217. By discriminating, the potential level of the input AC voltage can be discriminated.

When the photo coupler 220 is turned on, the triac 219 is turned on by the potential at the point “A”, so that the AC voltage is alternating from the AC input power 213 to the triac 219 to the halogen lamp. Since halogen lamp 216 is supplied through a loop of 216, halogen lamp 216 is turned on.

On the other hand, when the controller 217 outputs an off signal, since the potential at the point “A” does not occur, the triac 219 is turned off so that the AC voltage is no longer supplied to the halogen lamp 216.

Here, when the voltage level of the AC input power source 213 is 110 [V], as shown in FIG. 5A, the on signal output from the controller 217 is continuously supplied for a predetermined time, and at this time, the duty of the on state The ratio corresponds to 100% of the input AC voltage.

If the voltage level of the AC input power source 213 is 220 [V], as shown in FIG. 5B, the on signal output from the controller 217 is repeatedly supplied with the on / off state at a predetermined time interval. At this time, the duty ratio in the on state corresponds to 50% of the input AC voltage. Therefore, since the power supplied to the halogen lamp 216 is equal to Equation 1 below, the total power becomes the same value at 110 [V] and 220 [V].

here, Is the filament resistance value in the halogen lamp 216, Is the AC voltage value supplied to the halogen lamp 216, Denotes a current value flowing through the halogen lamp 216.

In this manner, if the duty ratio is determined according to the level of the AC voltage supplied from the AC input power source 213 as shown in Equation 2 below, even though the input voltage is different, the total power can be kept constant, so that all voltages The level can be shared.

As described above, although the specific embodiment (s) have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiment (s) but should be defined by the claims below and equivalents thereof.

As a result, according to the rated voltage common device of the fuser according to the present invention the following advantages occur.

That is, by adjusting the duty ratio of the input AC input power according to the level of the input AC voltage, it is possible to simultaneously accommodate the rated voltage of 110 [V] and 220 [V] using one halogen lamp.

Claims (4)

In an image forming apparatus comprising a fuser incorporating a halogen lamp, wherein the halogen lamp is heated to a fixing temperature by an AC input power supplied to the halogen lamp to perform a fixing operation: A voltage level detector for detecting a voltage level of the AC input power source; A controller for outputting a control signal having a different duty ratio according to the voltage level detected by the voltage level detector; And A fixing control unit controlling a state in which an AC voltage supplied from the AC input power is supplied to the halogen lamp according to a control signal output from the controller; And the controller controls the time for which the AC input voltage is supplied to the halogen lamp so that the total amount of power according to the voltage level of the AC input voltage inputted is the same. The method of claim 1, wherein the controller, Rated voltage common device of the fuser, characterized in that for controlling the supply of the AC input power to the halogen lamp at the same duty ratio. The method of claim 1, wherein the voltage level detector, A voltage divider for dividing the voltage level of the AC input power supply to a predetermined level; And a voltage dividing voltage divided by the voltage dividing resistor by the controller to detect the voltage level of the AC input voltage. The method of claim 3, wherein the fixing control unit, A triac for switching the supplied AC voltage to be supplied to the halogen lamp by switching by a voltage divided by the pair of voltage divider resistors; And A photodiode in which a conductive state of a constant voltage is controlled according to a control signal supplied from the controller, and a port triac controlled by a light emitted from the photodiode to control a supply state of a gate signal supplied to the triac. Rated voltage common device of a fuser comprising a photo coupler.