Patent Grant
9791818
This application claims the priority benefit of Korean Patent Application No. 10-2013-0123977, filed on Oct. 17, 2013 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
1. Field
Embodiments of the present disclosure relate to an image forming apparatus, and a method of reducing image banding of the image forming apparatus.
2. Description of the Related Art
An image forming apparatus is an apparatus that can print an image on printing medium such as a printing paper. The image forming apparatus includes a printer, a copier, a facsimile system, and a multifunction machine having all or a part of functions of a printer, a copier, and a facsimile system.
The image forming apparatus can be classified into an ink jet type and an electrophotographic type. An ink jet image forming apparatus discharges liquid droplets such as ink droplets onto specific areas of printing medium to print an image on the printing medium. An electrophotographic type image forming apparatus irradiates light onto a photoconductor unit to form an electrostatic latent image on the photoconductor unit, supplies toner having positive or negative polarity to the electrostatic latent image, and then transfers the electrostatic latent image to which the toner has been supplied to printing medium, thereby printing an image on the printing medium.
In an aspect of one or more embodiments, there is provided an image forming apparatus of reducing image banding that is generated when printing medium collides with a photoconductor unit during printing, and a method of reducing image banding of the image forming apparatus.
In an aspect of one or more embodiments, there is provided an image forming apparatus which includes: a photoconductor unit on which an electrostatic latent image is formed; and a conveying unit configured to convey printing medium at a first conveying velocity toward the photoconductor unit, and configured to convey the printing medium at a second conveying velocity that is lower than the first conveying velocity when the printing medium approaches the photoconductor unit.
The second conveying velocity may be 40% to 70% of the first conveying velocity.
The conveying unit may decrease a conveying velocity of the printing medium from the first conveying velocity to the second conveying velocity according to a predetermined acceleration pattern. The acceleration pattern may be defined by an acceleration function that uses at least one function among a linear function, a polynomial function, a square root function, an exponential function, and a logarithmic function.
The conveying unit may convey the printing medium at a third conveying velocity that is different from the second conveying velocity, and cause the printing medium to enter a nip formed between the photoconductor unit and a transfer unit configured to transfer the electrostatic latent image formed on the photoconductor unit to the printing medium.
The third conveying velocity may be identical to the first conveying velocity.
The conveying unit may decrease a conveying velocity of the printing medium to the second conveying velocity when the printing medium arrives at a deceleration start point. The conveying unit may increase a conveying velocity of the printing medium to a third conveying velocity when the printing medium arrives at an acceleration start point. The deceleration start point may be determined according to the acceleration start point.
The image forming apparatus may further include at least one conveying roller configured to rotate at a first angular velocity to convey the printing medium, and to rotate at a second angular velocity that is different from the first angular velocity, when the printing medium approaches the photoconductor unit.
The image forming apparatus may further include at least one of: a sensing unit configured to detect a position of the printing medium; and a computation unit configured to calculate a position of the printing medium according to a conveying velocity of the printing medium.
In an aspect of one or more embodiments, there is provided an image forming apparatus which includes: a photoconductor unit on which an electrostatic latent image is formed; a transfer unit configured to transfer the electrostatic latent image formed on the photoconductor unit to printing medium; and a conveying unit configured to convey the printing medium to a nip formed between the photoconductor unit and the transfer unit, and configured to change a conveying velocity of the printing medium when the printing medium approaches the nip.
In an aspect of one or more embodiments, there is provided a method of reducing image banding of an image forming apparatus, which includes: conveying printing medium to a photoconductor unit on which an electrostatic latent image is formed, at a first conveying velocity; and conveying the printing medium at a second conveying velocity that is lower than the first conveying velocity, when the printing medium approaches the photoconductor unit.
The second conveying velocity may be 40% to 70% of the first conveying velocity.
The conveying of the printing medium at the second conveying velocity may include decreasing a conveying velocity of the printing medium from the first conveying velocity to the second conveying velocity according to a predetermined acceleration pattern.
The acceleration pattern may be defined by an acceleration function that uses at least one function among a linear function, a polynomial function, a square root function, an exponential function, and a logarithmic function.
The method may further include conveying the printing medium at a third conveying velocity that is different from the second conveying velocity, and causing the printing medium to enter a nip formed between the photoconductor unit and a transfer unit configured to transfer the electrostatic latent image formed on the photoconductor unit to the printing medium.
The third conveying velocity may be identical to the first conveying velocity.
The conveying of the printing medium at the second conveying velocity may include decreasing a conveying velocity of the printing medium to the second conveying velocity when the printing medium arrives at a deceleration start point.
The method may further include increasing a conveying velocity of the printing medium to a third conveying velocity when the printing medium arrives at an acceleration start point.
The deceleration start point may be determined according to the acceleration start point.
The conveying of the printing medium at the second conveying velocity may be performed by at least one conveying roller configured to rotate at a first angular velocity to convey the printing medium, and to rotate at a second angular velocity that is different from the first angular velocity, when the printing medium approaches the photoconductor unit.
The method may further include at least one of: detecting an approach of the printing medium to the photoconductor unit; and determining whether the printing medium approaches the photoconductor unit, based on a conveying velocity of the printing medium.
According to an image forming apparatus and a method of reducing image banding of the image forming apparatus, as described above, since image banding that is generated when printing medium collides with a photoconductor unit during printing can be reduced, the quality of images that are printed on printing medium can be improved. In addition, since image banding can be reduced without adding a new element to the image forming apparatus, it is possible to simplify a design of the image forming apparatus, resulting in preventing a manufacturing cost from rising.
In an aspect of one or more embodiments, there is provided an image forming apparatus which includes a conveying unit configured to convey a printing medium to a nip formed between a photoconductor unit and a transfer unit, configured to change a conveying velocity of the printing medium when the printing medium approaches the nip, and configured to cause the conveying velocity of the printing medium entering the nip to be different from the conveying velocity of the printing medium when the printing medium is approaching the nip.
In an aspect of one or more embodiments, there is provided an image forming apparatus which includes a conveying unit configured to convey printing medium at a first conveying velocity toward a photoconductor unit, configured to convey the printing medium at a second conveying velocity that is lower than the first conveying velocity when the printing medium approaches the photoconductor unit, configured to convey the printing medium at a third conveying velocity that is different from the second conveying velocity, and configured to cause the printing medium to enter a nip formed between the photoconductor unit and a transfer unit.
The third conveying velocity is identical to the first conveying velocity.
These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which:
Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
Hereinafter, an image forming apparatus according to an embodiment of the present disclosure will be described with reference to
Referring to
The printing medium storage unit 10 may accommodate at least one printing medium on which an image is to be formed. When the imaging forming apparatus starts printing, the printing medium storage unit 10 may feed printing medium to the image forming apparatus so that the image forming apparatus can print a predetermined image on the printing medium.
The image forming apparatus may include a single printing medium storage unit 10, as illustrated in
The conveying unit 20 may convey the printing medium stored in the printing medium storage unit 10 to the photoconductor unit 50. According to an embodiment, the conveying unit 20 may include one or more conveying rollers 21 to 25, as illustrated in
According to an embodiment, the conveying unit 20 may convey the printing medium at various conveying velocities. If the conveying unit 20 includes one or more conveying rollers 21 to 25, a conveying velocity of the printing medium may be determined by a rotating angular velocity of the conveying rollers 21 to 25. If the rotating angular velocity of the conveying rollers 21 to 25 changes, the conveying velocity of the printing medium that is conveyed by the conveying rollers 21 to 25 may also change to a conveying velocity corresponding to the rotating angular velocity. For example, the conveying rollers 21 to 25 may convey the printing medium at a predetermined conveying velocity while rotating at a predetermined rotating angular velocity, and change the rotating angular velocity when the printing medium arrives at a predetermined location to change the conveying velocity of the printing medium. The printing medium may be conveyed at the changed conveying velocity from when it has passed the predetermined location.
The conveying rollers 21 to 25 of the conveying unit 20 may include a first roller 21 to make printing medium approach the photoconductor unit 50, second rollers 23 and 24 to feed the printing medium, and a third roller 25 to convey printing medium on which an image has been printed to a discharge unit 80.
The first roller 21 may convey the printing medium toward the photoconductor unit 50 so that the printing medium can enter a nip formed between the photoconductor unit 50 and the transfer unit 60, as illustrated in
In
The irradiating unit 30 may irradiate light to the photoconductor unit 50 in order to print an image on printing medium. In detail, the irradiating unit 30 may include a light irradiator 31 to irradiate light such as laser, and a mirror 32 to reflect light irradiated from the light irradiator 31 so as for the light to arrive at a predetermined location of the photoconductor unit 50 charged to a predetermined potential.
The light irradiator 31 may irradiate predetermined light to the mirror 32 or the photoconductor unit 50. The predetermined light may be laser.
The mirror 32 may reflect light irradiated from the light irradiator 31 according to a predetermined control signal so as for the light to arrive at the photoconductor unit 50. The mirror 32 may move or rotate such that reflected light can arrive at a predetermined location of the photoconductor unit 50. According to an embodiment, the mirror 32 may be a polygon prism.
The toner supply unit 40 may store toner that is supplied to the photoconductor unit 50 using roller 41. The toner stored in the toner supply unit 40 may have been charged with positive (+) or negative (−) charges. If a positive- or negative-charged electrostatic latent image is formed on the photoconductor unit 50, the toner charged with negative or positive charges may be adhered onto the electrostatic latent image to form a predetermined image.
An electrostatic latent image may be formed on the surface of the photoconductor unit 50 according to light irradiated to the photoconductor unit 50. An example of a process in which an electrostatic latent image is formed on the surface of the photoconductor unit 50 is as follows. First, a predetermined voltage may be applied to the photoconductor unit 50 so that a negative or positive surface potential is formed on the surface of the photoconductor unit 50 (charging step). If light such as laser is irradiated from the light irradiator 31, the light may arrive at the surface of the photoconductor unit 50 on which a surface potential has been formed. A transmission path of the light may be adjusted by the mirror 32 that reflects light. If the light is incident onto the surface of the photoconductor unit 50, a surface potential of an area of the photoconductor unit 50, onto which the light has been irradiated, may be decayed so that a predetermined print pattern, that is, an electrostatic latent image is formed on the surface of the photoconductor unit 50. The electrostatic latent image is formed on an area of the photoconductor unit 50, changed to polarity that is opposite to the polarity of the photoconductor unit 50 initialized in the charging step (exposure step). Toner having polarity opposite to that of the electrostatic latent image may be supplied from the toner supply unit 40 to the area on which the electrostatic latent image has been formed, and the supplied toner may be adhered onto the area of the photoconductor unit 50 on which the electrostatic latent image has been formed. As a result, an image to be printed may be formed on the surface of the photoconductor unit 50 (developing step).
According to an embodiment, the photoconductor unit 50 may be a photoconductor drum, more specifically, an Organic Photo Conductor (OPC) drum. The OPC drum is a cylindrical photoconductor device in which an OPC material is coated on the surface of an aluminum tube. The OPC drum may form an electrostatic latent image by irradiating light on a surface charged with negative charges to charge an area on which an image is to be formed with positive charges, when the image forming apparatus prints the image on printing medium.
The transfer unit 60 may transfer the electrostatic latent image formed on the photoconductor unit 50 to the printing medium conveyed by the conveying unit 20. The transfer unit 60 may include a transfer roller 61, as illustrated in
The fixing unit 70 may fix the image transferred to the printing medium. According to an embodiment, the fixing unit 70 may fix the image transferred to the printing medium onto the printing medium by heating the printing medium to which the image has been transferred to compress toner onto the printing medium. The printing medium to which the image has been transferred may be conveyed toward the discharge unit 80 by the third roller 25 of the conveying unit 20.
The discharge unit 80 may discharge the printing medium on which the image has been printed to the outside. The discharge unit 80 may include a predetermined outlet. A discharge roller 80a may be disposed around the outlet in order to support discharge of printing medium.
According to an embodiment, the image forming apparatus may include a sensing unit 71 for detecting a position of printing medium. The sensing unit 71 may detect a position of printing medium using light or a weight of the printing medium. The sensing unit 71 may be an optical sensor, such as a visible light sensor or an irradiated sensor, or a mass sensor.
The controller 90 may control overall operations of the image forming apparatus. For example, the controller 90 may generate predetermined control signals, and transfer the predetermined control signals to the light irradiator 31, the mirror 32, the toner supply unit 40, the photoconductor unit 50, and the transfer unit 60, respectively, thereby controlling operations of the light irradiator 31, the mirror 32, the toner supply unit 40, the photoconductor unit 50, and the transfer unit 60.
The controller 90 may be a processor such as a Central Processing Unit (CPU). The processor may be implemented as at least one semiconductor chip or at least one semiconductor memory. The semiconductor chip or the semiconductor memory may be mounted on a Printed Circuit Board (PCB).
According to an embodiment, the controller 90 may control a conveying velocity of printing medium. For example, the controller 90 may transfer a predetermined control signal to the conveying unit 20 so as to convey printing medium at a first conveying velocity, or to change a conveying velocity of printing medium. In order to control the conveying velocity of printing medium, the controller 90 may control rotation velocities of the conveying rollers 21 to 25 of the conveying unit 20. For example, the controller 90 may generate a control signal for changing a rotating angular velocity of the first roller 21 from a first angular velocity to a second angular velocity, and transfer the control signal to the first roller 21. As another example, the controller 90 may generate a control signal for changing a rotating angular velocity of the first roller 21 from the second angular velocity to a third angular velocity, and transfer the control signal to the first roller 21. Also, the controller 90 may control changes in angular velocity, that is, changes in angular acceleration of the conveying rollers 21 to 25 of the conveying unit 20. For example, the controller 90 may generate a control signal for reducing an angular velocity of the first roller 21 from the first angular velocity to the second angular velocity according to fixed angular acceleration, and transfer the control signal to the first roller 21.
Hereinafter, image bending of the imaging forming apparatus will be described with reference to
As illustrated in
If an angular velocity of the photoconductor drum 51 does not change, an exposure density on the surface of the photoconductor drum 51 can be maintained as a desired exposure density. Accordingly, in this case, an ideal image i as shown in
However, if the angular velocity of the photoconductor drum 51 changes as described above with reference to
According to an embodiment, the conveying unit 20 of the image forming apparatus may change a conveying velocity of printing medium that is conveyed toward the photoconductor drum 50 in order to prevent image banding.
As illustrated in
The photoconductor drum 51 may rotate at a first photoconductor drum angular velocity ωa, and the transfer roller 61 may rotate at a transfer roller angular velocity ωb. The first photoconductor drum angular velocity ωa may be identical to or different from the transfer roller angular velocity ωb. A nip x which printing medium enters and at which an electrostatic latent image is transferred to the printing medium may be formed between the photoconductor drum 51 and the transfer roller 61.
One or more points at which the conveying velocity of printing medium changes may exist around the photoconductor drum 51. The one or more points at which the conveying velocity of printing medium changes may be a deceleration start point y and an acceleration start point z. The deceleration start point y and the acceleration start point z may be located between the photoconductor drum 51 and the first rollers 21 and 22. The deceleration start point y may be more distant from the photoconductor drum 51 and closer to the first rollers 21 and 22, than the acceleration start point z. The acceleration start point z may be located between the deceleration start point y and the nip x.
According to an embodiment, the deceleration start point y may be determined as a point from which a distance to the photoconductor drum 51 or the nip x is within a predetermined range. For example, in an image forming apparatus having a predetermined size, a deceleration start point y may be at one of distances from 10 mm to 12 mm away from the photoconductor drum 51 or the nip x in the direction toward the first rollers 21 and 22.
According to an embodiment, the deceleration start point y may be determined depending on the acceleration start point z. More specifically, a distance between the deceleration start point y and the photoconductor drum 51 or the nip x may be determined depending on a distance between the acceleration start point z and the photoconductor drum 51 or the nip x. For example, in an image forming apparatus having a predetermined size, a distance dy between a deceleration start point y and a nip x may be determined depending on a relationship between the distance dy between the deceleration start point y and the nip x and a distance dz between an acceleration start point z and the nip x, which can be given by Equation (1).
0<dy−dz≦2 (1)
where dy is a distance between the deceleration start point y and the photoconductor drum 51 or the nip x, and dz is a distance between the acceleration start point z and the photoconductor drum 51 or the nip x. In Equation (1), the unit of each constant is millimeters (mm). According to an embodiment, the distance dz between the acceleration start point z and the photoconductor drum 51 or the nip x may be longer than 10 mm.
According to an embodiment, the acceleration start point z may be determined as an arbitrary point as long as the distance dz between the acceleration start point z and the photoconductor drum 51 or the nip x is within a predetermined range. For example, in an image forming apparatus having a predetermined size, an acceleration start point z may be at one of distances from 10 mm to 60 mm away from the photoconductor drum 51 or the nip x in the direction toward the first rollers 21 and 22. For example, the acceleration start point z may be at a distance of 60 mm away from the photoconductor drum 51 or the nip x in the direction toward the first rollers 21 and 22.
The first rollers 21 and 22 may rotate at a predetermined conveying angular velocity ωt. According to an embodiment, a plurality of first rollers 21 and 22 may be provided in pairs to convey printing medium, as illustrated in
If the conveying angular velocity ωt of the first rollers 21 and 22 changes, the conveying velocity v of the printing medium also changes so that the conveying velocity v of the printing medium can be adjusted. The first rollers 21 and 22 may rotate at a lower conveying angular velocity ωt in order to decrease the conveying velocity v of printing medium, and the first rollers 21 and 22 may rotate at a higher conveying angular velocity ωt in order to increase the conveying velocity v of printing medium. The velocity of the first rollers 21 and 22 may be controlled by the controller 90.
Referring to
Hereinafter, changes in conveying velocity of printing medium will be described in more detail.
Referring to
The printing medium may arrive at a predetermined point, for example, a deceleration start point y at the first conveying time t1. According to an embodiment, whether the printing medium has arrived at the predetermined point may be determined depending on whether the sensing unit 71 (see
As illustrated in
As a result, the printing medium may approach the photoconductor drum 51 at the second conveying velocity v2 that is lower than the first conveying velocity v1, in an area between the deceleration start point y and the photoconductor drum 51.
Successively, the printing medium may arrive at a predetermined point, for example, an acceleration start point z at the second conveying time t2. As illustrated in
Since the printing medium enters the nip x at the third conveying velocity, the third conveying velocity may be set to a velocity at which an electrostatic latent image can be transferred to the printing medium. Accordingly, the third conveying velocity may be decided depending on the rotating angular velocities ωa and ωb of the photoconductor drum 51 and the transfer roller 61.
According to an embodiment, the third conveying angular velocity may be identical to the first conveying angular velocity ωt1, as shown in
If printing terminates, the conveying unit 20, for example, the first rollers 21 and 22 may stop rotating at the conveying end time t4, and accordingly, printing medium may be no longer conveyed.
The rotating angular velocity of the conveying unit 20 and the conveying velocity of the printing medium may be controlled by the controller 80.
As such, if the conveying velocity v of the printing medium decreases when the printing medium approaches the photoconductor unit 50, for example, the photoconductor drum 51, the printing medium does not collide with the photoconductor unit 51, for example, the photoconductor drum 51, or collides with the photoconductor unit 50, for example, the photoconductor drum 51 with a relatively weak impulse. Accordingly, the photoconductor drum 51 has no change or a minimum change in angular velocity. As shown in
As a result, since an exposure density on the surface of the photoconductor drum 51 can be maintained as a desired exposure density, an ideal image i as shown in
The rotation velocity w and the conveying velocity v of the conveying unit 20 can be controlled by various methods. For example, a rotation velocity of the first rollers 21 and 22 of the conveying unit 20 may decrease from the first conveying angular velocity ωt1 to the second conveying angular velocity ωt2 according to a predetermined acceleration pattern, or may increase from the second conveying angular velocity ωt2 to the third conveying angular velocity according to a predetermined acceleration pattern.
As illustrated in
If the angular velocity of the first rollers 21 and 22 decreases from the first conveying angular velocity ωt1 during the time period from t1 to t11 and reaches the second conveying angular velocity ωt2, the first rollers 21 and 22 may rotate at the second conveying angular velocity ωt2 (a period (B2) of
As shown in
An acceleration pattern for decreasing the first conveying angular velocity ωt1 to the second conveying angular velocity ωt2, or an acceleration pattern for increasing the second conveying angular velocity ωt2 to the third conveying angular velocity may be decided in various ways. For example, the acceleration pattern may be defined by an acceleration function that uses at least one function among a linear function, a polynomial function, a square root function, an exponential function, and a logarithmic function.
For example, the acceleration pattern may be a linear acceleration pattern defined by a linear function, as illustrated in
According to an embodiment, the acceleration pattern (an acceleration pattern corresponding to the period (B1)) for decreasing the first conveying angular velocity ωt1 to the second conveying angular velocity ωt2 may be identical to or different from the acceleration pattern (an acceleration pattern corresponding to the period (B3)) for increasing the second conveying angular velocity ωt2 to the third conveying angular velocity.
An acceleration pattern that is applied to each period may be selected and decided by a system designer or a user using the image forming apparatus.
Hereinafter, a method of reducing image banding of the image forming apparatus, according to an embodiment of the present disclosure, will be described with reference to
As illustrated in
The printing medium may approach the photoconductor unit 50 while moving toward the photoconductor unit 50 by the conveying unit 20 (S120).
If the printing medium arrives at a predetermined point, for example, a deceleration start point, the conveying unit 20 may decrease the conveying velocity of the printing medium (S130). In this case, whether the printing medium has arrived at the deceleration start point may be determined depending on whether the sensing unit 71 (see
As such, since the conveying velocity of printing medium decreases before the printing medium enters a nip formed between the photoconductor unit 50 and the transfer unit 60, the printing medium may not collide with the photoconductor unit 50. Accordingly, it is possible to prevent the velocity of the photoconductor unit 50 from decreasing due to a collision between printing medium and the photoconductor unit 50, resulting in preventing image bending. Even when printing medium collides with the photoconductor unit 50, an amount of impulse can be relatively reduced. Accordingly, it is possible to minimize a reduction in velocity of the photoconductor unit 50, and consequently to maximally block image bending.
If the printing medium arrives at a predetermined point, for example, at an acceleration start point, the conveying unit 20 may increase the conveying velocity of the printing medium (S140). In this case, whether the printing medium has arrived at the acceleration start point may be determined depending on whether the sensing unit 71 (see
The printing medium may enter a nip formed between the photoconductor unit 50 and the transfer unit 60 while moving at the increased velocity (S150).
Before the printing medium enters the nip, an electrostatic latent image may be formed on the surface of the photoconductor unit 50, for example, the photoconductor drum 51 according to an exposure process, and toner may be supplied to the electrostatic latent image to develop the electrostatic latent image (S210). The exposure and developing processes may be performed before the printing medium approaches the photoconductor unit 50 (S120) or after the printing medium has approached the photoconductor unit 50.
If the printing medium enters the nip, the electrostatic latent image in which toner has been supplied on the surface of the photoconductor drum 51 may be transferred to the printing medium (S160). Successively, toner adhered on the printing medium may be compressed by the fixing unit 70, and fixed on the printing medium (S170). The printing medium on which toner has been fixed may be discharged to the outside through the discharge unit 80 (S180).
Before the photoconductor unit 50 may remove toner remaining on the surface of the photoconductor unit 50 through a cleaning process, for another printing job, and eliminate a surface potential remaining on the photoconductor unit 50 through a static elimination process (S220).
The above-described operations S100 to S180 and S200 to S220 may be repeatedly performed while a plurality of printing jobs are printed (S190).
Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2013-0123977 | Oct 2013 | KR | national |
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| Number | Date | Country |
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| 2014119240 | Aug 2014 | WO |
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| Number | Date | Country | |
|---|---|---|---|
| 20150110536 A1 | Apr 2015 | US |
