# Patent

## Title
Ink receiving unit and inkjet printer including the same

## Abstract

An ink receiving unit for an inkjet printer includes an ink receiver and an ink removing device. The inkjet printer has an inkjet head configured to eject ink onto a first surface of a medium. The ink receiver is provided to face the inkjet head via the medium. The ink receiver is configured to receive ink dripping from a second surface opposite to the first surface of the medium during printing. The ink removing device is configured to remove the ink from the ink receiver. The ink receiver unit is detachably mounted to a main body to which the inkjet head is mounted.

## Background
CROSS-REFERENCE TO RELATED APPLICATION
The present application claims priority to Japanese Patent Application No. 2007-327615, filed on Dec. 19, 2007, the entire contents of which are herein incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink receiving unit and an inkjet printer including the ink receiving unit.
2. Discussion of the Background
Recently, inkjet printers for printing on a variety of materials as media other than paper have been developed. For example, an inkjet printer capable of printing on a mesh-like medium or a fibrous medium has been developed.
Mesh-like media and fibrous media have coarse texture as compared to paper. Therefore, if printing is conducted on such a medium by an inkjet printer, the medium allows ink ejected onto the surface thereof to seep through the medium to the back side of the medium. As the ink seeps through to the back of the medium, the ink may be deposited on the printing apparatus, causing contamination of medium. Therefore, in case of printing on the aforementioned medium, it is essential to takes measures to cope with ink droplets dripping from the back of the medium.
As an example of a coping method, such a method is conceivable to dispose a gutter-like ink receiver for receiving ink droplets dripping from the back of the medium. In this method, the ink receiver may be arranged below the inkjet head to have a slant. The slant lets the ink dripping from the medium flow under its own weight to remove (run off) the ink. Further, such a method is also conceivable to dispose a sponge for absorbing the ink on the gutter of the ink receiver and to replace suitably the sponge with new one.
However, it is difficult to remove all ink only by using the gutter-like receiver having a slant. Ink may remain on the ink receiver and become solidified. Further, if the solidified ink is stacked and/or blocks the flow of ink, the back of the medium may be contaminated by ink remaining on the ink receiver. If the medium is contaminated, the image quality on the medium is degraded, thus spoiling the medium.
In case of disposing the sponge for absorbing the ink, the timing for replacement depends on the frequency of use of machine. Since the absorption property of the sponge deteriorates due to ink fixated to the sponge, it is inconvenient.
Due to the aforementioned problems, these methods require considerable labor for periodical manual maintenance. Accordingly, there is a demand to provide a more suitable method for handling ink dripping from the back of the medium. Therefore, there is a need to provide an ink receiving unit and a printing apparatus capable of solving the aforementioned problems.
Conventionally, for example, there is known an arrangement of an inkjet printer addressing the object of quickly and reliably collecting waste ink without contaminating the circumference (for example, see JP-A-H11-48498). However, this arrangement relates to collection of waste ink during maintenance conducted by discharging the ink from each nozzle at the time of non-printing. Further, the collection of waste ink is conducted at a place out of the printing range where the printing is conducted on media. That is, the arrangement is not capable of suitably collecting ink dripping from the back of the medium during printing. Therefore, the aforementioned problems cannot be solved even using this arrangement. The contents of JP-A-H11-48498 are incorporated herein by reference in their entirety.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, an ink receiving unit for an inkjet printer includes an ink receiver and an ink removing device. The inkjet printer has an inkjet head configured to eject ink onto a first surface of a medium. The ink receiver is provided to face the inkjet head via the medium. The ink receiver is configured to receive ink dripping from a second surface opposite to the first surface of the medium during printing. The ink removing device is configured to remove the ink from the ink receiver. The ink receiver unit is detachably mounted to a main body to which the inkjet head is mounted.
According to another aspect of the present invention, an inkjet printer includes a main body, an inkjet head, and an ink receiving unit. The inkjet head is mounted to the main body and configured to eject ink onto a first surface of a medium. The ink receiving unit includes an ink receiver and an ink removing device. The ink receiver is detachably mounted to the main body and provided to face the inkjet head via the medium. The ink receiver is configured to receive ink dripping from a second surface opposite to the first surface of the medium during printing. The ink removing device is configured to remove the ink from said ink receiver.



BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many of the attendant advantages thereof will become readily apparent with reference to the following detailed description, particularly when considered in conjunction with the accompanying drawings, in which:
FIG. 1 is an illustration of a main body of a printing apparatus 10 according to an embodiment of the present invention;
FIG. 2 is an illustration showing an attaching state that an ink receiving unit 14 is attached to a main body 12 of the printing apparatus 10;
FIGS. 3(a) and 3b) are enlarged views of attached portions of the ink receiving unit 14, where FIG. 3(a) is an enlarged view of one end side of the ink receiving unit 14, and FIG. 3(b) is an enlarged view of the other end side of the ink receiving unit 14;
FIGS. 4(a) and 4(b) are illustrations showing a first example of specific structure of the ink receiving unit 14, where FIG. 4(a) shows the structure of one end side of the ink receiving unit 14, and FIG. 4(b) shows the structure of the other side of the ink receiving unit 14;
FIG. 5 is a perspective view of an upper side of the ink receiver 102 as seen diagonally from rear left;
FIG. 6 is a perspective view of a bottom side of the ink receiver 102 as seen diagonally from front right;
FIGS. 7(a) and 7(b) are illustrations showing a second example of specific structure of the ink receiving unit 14, where FIG. 7(a) shows the structure of one end side of the ink receiving unit 14, and FIG. 7(b) shows the structure of the other end side of the ink receiving unit 14; and
FIGS. 8(a) and 8(b) are illustrations schematically showing a variation of the structure of the ink receiving unit 14, where FIG. 8(a) is a top view of the ink receiving unit 14, and FIG. 8(b) is a sectional side view of the ink receiving unit 14.



DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE INVENTION
Embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the following description, the constituent elements having substantially the same function and arrangement are denoted by the same reference numerals, and repetitive descriptions will be made only when necessary. The embodiments of the present invention have the following arrangements.
In a first arrangement, an ink receiving unit is provided which is used in a printing apparatus for printing in accordance with an inkjet method and which is detachably mounted to a main body provided with an inkjet head. The ink receiving unit includes an ink receiver which is arranged at a position facing the inkjet head across a medium during printing to receive ink dripping from the back of the medium, and an ink removing means for removing the ink in the ink receiver from the ink receiver.
The ink receiving unit is mounted, for example, in case of printing on a medium through which ink ejected onto the surface of the medium is allowed to seep to the back side of the medium. The medium through which ink ejected onto the surface of the medium is allowed to seep to the back side of the medium is, for example, a medium allowing ink ejected from an inkjet head to drip from the back thereof. Examples of such media include mesh-like media and fibrous media.
According to this arrangement, it is possible to suitably receive the ink dripping from the back of the medium. By using the ink removing means, the ink received by the ink receiver can be suitably removed. Therefore, it is possible to suitably prevent the ink in the ink receiver from being stacked or solidified. Since the ink receiver can be automatically cleaned by operation of the ink removing means, the time and labor for periodical manual maintenance can be significantly reduced, thereby suitably reducing the cleaning time and labor for manually cleaning the ink receiver. As compared to a case of using a sponge or the like for absorbing the ink, it is not required to exchange the sponge or the like.
In this arrangement, since the arrangement for receiving ink is structured as a unit, the ink receiving unit can be used according to the user's need. For example, in case of printing on a medium such as a mesh-like medium or a fibrous medium, the ink receiving unit is used. On the other hand, in case of printing on a medium such as non mesh-like medium, the ink receiving unit is not used. The non mesh-like medium is, for example, a medium not allowing ink ejected on the surface of thereof to drip from the back thereof. In case of printing on a medium such as non mesh-like medium, for example, a platen unit is mounted after the ink receiving unit is detached. Therefore, according to this arrangement, the printing apparatus can handle different kinds of media by changing the unit according to the kind of medium.
The ink removing means removes ink in real time, for example, during the printing operation. In this case, for example, the ink removing means preferably operates always at the same time of the printing operation. Further, the ink removing means may start the operation for removing ink in response to the depression of the button or the like during the maintenance of the printing apparatus, for example.
The ink removing means may remove ink, for example, when the printer apparatus is in stand-by state (sleeping state). According to this arrangement, it is possible to suitably prevent the solidification of residual ink in an unattended environment, i.e. without any user.
In a second arrangement, the printing apparatus is a printing apparatus of a scanning type in which the printing is conducted while reciprocating the inkjet head in a previously set main scanning direction, the ink receiver is a gutter-like member extending in the main scanning direction, the ink removing means is a wiper member which is slidable along the gutter-like ink receiver and is adapted to remove the ink in the ink receiver by traveling within the ink receiver in the main scanning direction, the main body has a driving motor for producing power for driving the wiper member, the ink receiving unit further includes a wire for moving the wiper member, which is connected to the wiper member and is tensioned to extend in the longitudinal direction of the ink receiver, and a wire drum on which the wire is wound and which moves the wire according to the output power of the driving motor, and in a state that the ink receiving unit is mounted to the main body, the rotary shaft of the driving motor and the rotary shaft of the wire drum extend parallel to a sub scanning direction perpendicular to the main scanning direction. For example, the main body further includes a train of idler gears connecting from the driving motor to the wire drum. In addition, the ink receiving unit may include a train of idler gears. The ink receiving unit is mounted to the main body by pushing the ink receiving unit into the main body in a linear manner from the front side of the main body.
According to this arrangement, the gutter-like ink receiver which is small in the width direction is used, thereby suitably reducing the size of the ink receiver. In addition, the wiper member is used as the ink removing means, thereby suitably removing the ink in the ink receiver.
According to this arrangement, the rotary shafts of the driving motor and the wire drum are arranged to extend parallel to each other. Therefore, the power of the driving motor can be reliably transmitted to the wire drum by a simple structure. The sub scanning direction which is parallel to the rotary shafts is parallel to a direction extending from the front surface to the back surface of the main body, for example. According to this arrangement, for example, the rotary shafts of the driving motor and the wire drum can be meshed with each other by pushing the ink receiving unit into the main body in a linear manner from the front side of the main body. Therefore, this arrangement facilitates the mounting of the ink receiving unit, for example. It should be noted that the rotary shafts of the driving motor and the wire drum may be meshed via another gear between them.
In a third arrangement, the printing apparatus is a printing apparatus of a scanning type in which the printing is conducted while reciprocating the inkjet head in a previously set main scanning direction, the ink receiver is a gutter-like member extending in the main scanning direction, the ink removing means is a wiper member which is slidable along the gutter-like ink receiver and is adapted to remove the ink in the ink receiver by traveling within the ink receiver in the main scanning direction, the main body has a driving motor for producing power for driving the wiper member, the ink receiving unit further includes a wire for moving the wiper member, which is connected to the wiper member and is tensioned to extend in the longitudinal direction of the ink receiver, and a wire drum, on which the wire is wound and which moves the wire according to the output power of the driving motor, and in a state that the ink receiving unit is mounted to the main body, the rotary shaft of the wire drum extends parallel to a sub scanning direction perpendicular to the main scanning direction and the rotary shaft of the driving motor extends parallel to the main scanning direction. For example, the main body further includes a train of idler gears connecting from the driving motor to the wire drum. In addition, the ink receiving unit may include a train of idler gears.
According to this arrangement, the gutter-like ink receiver which is small in the width direction is used, thereby suitably reducing the size of the ink receiver. In addition, the wiper member is used as the ink removing means, thereby suitably removing the ink in the ink receiver.
According to this arrangement, the rotary shaft of the driving motor extends parallel to the main scanning direction, thereby allowing the driving motor to be located at a position adjacent to the ink receiving unit in the main scanning direction, for example. This arrangement can achieve reduction of size in the depth direction, i.e. the sub scanning direction, required for installation of the ink receiving unit in the main body. Further, this arrangement can prevent the printing apparatus from growing in size, for example.
In the aforementioned second and third arrangements, the sub scanning direction is a direction perpendicular to the main scanning direction in a plane parallel to the medium. The driving motor of the main body cooperate together with the wire drum of the ink receiving unit and the like to compose a driving section for driving the wiper member. The driving section may include another gear(s) and the like between the driving motor and the wire drum.
The ink receiver spreads in a wide area larger than the width of the medium in the main scanning direction, for example. According to this arrangement, ink droplets are suitably received. The printing apparatus is preferably a printing apparatus of a paper-moving type in which the printing is conducted while feeding a medium in a sub scanning direction perpendicular to the main scanning direction. According to this arrangement, it is not required to move the ink receiver so that ink can be suitably received.
In a fourth arrangement, a printing apparatus for printing in accordance with the inkjet method includes a main body which is provided with an inkjet head, and an ink receiving unit as described in any one of the first, second, or third arrangements. According to this arrangement, the same effects as those of the first, second, and third arrangements can be obtained.
In a fifth arrangement, the printing apparatus is a printing apparatus of a scanning type in which the printing is conducted while reciprocating the inkjet head in a previously set main scanning direction, the ink receiver is a gutter-like member extending in the main scanning direction, the ink removing means is a wiper member which is slidable along the gutter-like ink receiver and is adapted to remove the ink in the ink receiver by traveling within the ink receiver in the main scanning direction, the printing apparatus further includes a controller for controlling the operation of the wiper member in the main scanning direction and the controller changes the stand-by position of the wiper member for every operation in which the wiper member travels a predetermined amount, the stand-by position being a position within the ink receiver where the wiper member stands by when it is not in operation.
As the ink is removed by the wiper member, the ink adheres to the wiper member. Accordingly, as the wiper member is stopped after removal of ink, the ink directly below the wiper member may be solidified at the stand-by position where the wiper member is stopped. If the wiper member is stopped at the same position every time, the solidified ink may be stacked at the position by the repetition of the traveling and stopping of the wiper member. The stacked solidified ink may contaminate the back of the medium and further may block the operation of the wiper member.
According to the fifth arrangement, however, even though the ink directly below the wiper member is solidified, the stand-by position of the wiper member is suitably changed, thereby distributing the position where ink is solidified. Therefore, it is possible to suitably prevent the problem caused due to stacking of solidified ink.
It should be noted that the operation of the wiper member of traveling a predetermined amount means that the wiper member conducts reciprocation traveling within the ink receiver for a predetermined number of times or more or for a predetermined period of time or more. The controller may change the stand-by position of the wiper member for every a predetermined number of times of the stand-by of the wiper member. For example, the controller may change the stand-by position of the wiper member definitely every operation. In case of changing the stand-by position of the wiper member, the controller may change the stand-by position within the operation range of the wiper member in a random manner, for example.
According to an embodiment of the present invention, ink droplets dripping from the back of the medium is received by the ink receiver and is suitably removed. This arrangement also suitably reduces the cleaning time and labor for manually cleaning the ink receiver, for example.
Hereinafter, embodiments according to the present invention will be described with reference to the drawings. FIG. 1 though FIG. 3(b) show an example of arrangement of printing apparatus 10 according to an embodiment of the present invention. FIG. 1 shows appearance of a main body of the printing apparatus 10. FIG. 2 shows an attaching state that an ink receiving unit 14 is attached to the main body 12 of the printing apparatus 10. FIGS. 3(a) and 3(b) are enlarged views of attached portions of the ink receiving unit 14. FIG. 3(a) is an enlarged view of one end side of the ink receiving unit 14. FIG. 3(b) is an enlarged view of the other end side of the ink receiving unit 14.
The printing apparatus 10 is an inkjet printer of a scanning type in which the printing is conducted while reciprocating an inkjet head thereof in a previously set main scanning direction. The printing apparatus 10 is a printing apparatus of a paper-moving type in which the printing is conducted while feeding a medium in a sub scanning direction perpendicular to the main scanning direction. Further, in this embodiment, the printing apparatus 10 is a printing apparatus for printing on a medium through which ink ejected onto the surface of the medium is allowed to seep to the back side of the medium and includes a main body 12 and an ink receiving unit 14. The medium through which ink ejected onto the surface of the medium is allowed to seep to the back side of the medium is a medium allowing ink ejected from an inkjet head to drip from the back thereof, for example, mesh-like media and fibrous media.
The main body 12 is a main portion of the printing apparatus 10 for printing on the medium. In this embodiment, the ink receiving unit 14 is attached to the main body 12. The main body 12 has an inkjet head 16 and a controller 18 therein. The inkjet head 16 is a print head for ejecting ink in accordance with the inkjet method. The controller 18 is a control device such as a CPU for controlling respective components of the printing apparatus 10. Though only some components have been described in the above for ease of explanation, the main body 12 suitably comprises components required for printing, such as a feeding unit for feeding media.
The ink receiving unit 14 is a member for receiving ink droplets dripping from the back of the medium and is detachably attached to the main body 12. In this embodiment, the ink receiving unit 14 is mounted such that the longitudinal direction thereof extends parallel to the main scanning direction. At least during printing, an ink receiver which receives ink droplets in the ink receiving unit 14 faces the inkjet head 16 across a medium. The ink receiver spreads in a wide area larger than the width of the medium in the main scanning direction. According to this embodiment, ink droplets dripping from the back of the medium can be suitably received.
In this embodiment, the arrangement for receiving ink droplets dripping from the back of the medium is structured as a unit which is detachably attached to the main body 12, i.e. the ink receiving unit 14. Since the ink receiving unit 14 is separated from the main body 12, the ink receiving unit 14 can be used when it is necessary according to the kind of media or the like. For example, in case of printing on a medium such as a mesh-like medium or a fibrous medium, the ink receiving unit 14 is used. On the other hand, in case of printing on a medium such as non mesh-like medium, the ink receiving unit 14 is not used. Therefore, according to this embodiment, the printing apparatus 10 can handle different kinds of media.
In the state shown in FIG. 3(b), the inkjet head 16 stands by at a position outside of the ink receiving unit 14. However, during printing, the inkjet head 16 reciprocates in the main scanning direction. Accordingly, during printing, the ink receiver of the ink receiving unit 14 and the inkjet head 16 face each other across the medium. The distance between the inkjet head 16 and the ink receiver is in a range of from 3 to 10 mm, for example, and more preferably from 5 to 7 mm. According to this structure, ink droplets dripping from the back of the medium can be suitably received with the medium laying between the inkjet head 16 and the ink receiver.
FIGS. 4(a) and 4(b) show a first example of specific structure of the ink receiving unit 14. FIG. 4(a) shows the structure of one end side of the ink receiving unit 14 as well as some parts of the main body 12 (see FIG. 1). FIG. 4(b) shows the structure of the other side of the ink receiving unit 14.
In this example, the ink receiving unit 14 has an ink receiver 102, a wiper member 104, and some parts composing a driving section 106. The ink receiver 102 is a gutter-like waste ink tray for receiving ink droplets dripping from the back of the medium. In the example, the ink receiver 102 extends in the main scanning direction when the ink receiving unit 14 is attached to the main body 12. Formed on one end of the ink receiver 102 is an ink discharge port 202. The ink discharge port 202 is an opening for discharging waste ink received by the ink receiver 102 to the outside. The ink discharge port 202 is connected to a discharge passage 204 formed in the main body 12 so that waste ink is discharged by flowing the waste ink through the discharge passage 204.
In this example, the ink discharge port 202 is formed at the end, near the driving section 106, of the ink receiver 102. Accordingly, the ink receiving unit 14 collects waste ink by moving the wiper member 104 in a direction toward the driving section 106. Another ink discharge port 202 may also be formed at the end, far from the driving section 106, of the ink receiver 102. With this structure, waste ink can be also collected by moving the wiper member 104 in a direction apart from the driving section 106.
The wiper member 104 is an example of ink removing means for removing the ink in the ink receiver 102 from the ink receiver 102. In this example, the wiper member 104 slides in the main scanning direction corresponding to the longitudinal direction of the ink receiver 102. The wiper member 104 removes the ink in the ink receiver 102 by sliding and traveling along the gutter-like ink receiver 102. Therefore, the wiper member 104 functions as a waste ink wiper to clean the ink receiver 102 by forcibly removing the ink in the ink receiver 102. In this manner, this example can suitably remove the ink in the ink receiver 102.
In this example, the wiper member 104 has a substantially T-like shape and has a widespread portion 302 extending in the width direction of a gutter-like groove of the ink receiver 102 and a wire connecting portion 304 projecting from the center of the widespread portion toward one end of the ink receiver 102. The widespread portion 302 is a portion corresponding to a head portion of the character T and has a structure of spreading in the width direction of the ink receiver 102 so as to enable the widespread portion 302 to push out the ink in the ink receiver 102 according to the sliding of the wiper member 104. The wire connecting portion 304 is a portion corresponding to a leg portion of the character T and is connected to a wire 108 for driving the wiper member 104. Therefore, the wiper member 104 is moved along the ink receiver 102 when subjected to force of the driving section 106 through the wire 108.
The driving section 106 has a motor, gears, and the like for driving the wiper member 104. In this example, the driving section 106 has a driving motor 206 and a wire drum 208. The driving motor 206 rotates the wire drum 208 according to a command from the controller 18. The wire drum 208 is a drum on which the wire 108 is wound and moves the wire 108 according to the output power of the driving motor 206. Therefore, the driving section 106 drives the wiper member 104 via the wire 108 according to the command of the controller 18.
In this example, the driving section 106 also comprises gears and/or pulleys, for example. The driving section 106 is structured by combining respective components on the main body 12 and the ink receiving unit 14. Specific structure of the driving section 106 will be further described later in detail.
The wire 108 is a driving wire transmitting the power of the driving section 106 to the wiper member 104. In this example, the wire 108 is tensioned to extend in the longitudinal direction of the ink receiver 102 by pulleys of the driving section 106 in the ink receiver 102.
In this example, the wire 108 is tensioned to extend to make a round trip (loop) in the ink receiver 102 by and between the wire drum 208 and the pulley, disposed on one end side of the ink receiving unit 104, of the driving section 106 and a plurality of pulleys, disposed on the other end side of the ink receiving unit 104, of the driving section 106. A part corresponding to one way of the round trip of the wire 108 is tensioned to extend along the center in the width direction of the ink receiver 102. The wire connecting portion 304 of the wiper member 104 is attached to the part of the wire extending along the center. Thus, the wire 108 holds the T-like wiper member 104 at the center of the wiper member 104 (center holding). When the wiper member 104 is held at its center, the wiper member 104 is held at its center of gravity so that the wiper member 104 does not practically rattle and the wiper member 104 can stably travel.
As a method for holding the wiper member 104 using the wire 108, there is conceivable a method of holding one side of the wiper member 104 (cantilever holding) instead of center holding. However, the cantilever holding makes the wiper member 104 more easily rattle so that it may be difficult to drive the wiper 104 to stably travel. As measures for preventing the rattling are taken, the apparatus may be increased in size and in cost. Further, the workability may become worse. However, according to this example, the wiper member 104 is held at the center, thereby driving the wiper member 104 to stably travel without increasing the size of the apparatus.
As mentioned above, according to this example, ink received by the ink receiver 102 can be suitably removed by the wiper member 104. Therefore, it is possible to suitably prevent the ink in the ink receiver 102 from being stacked or solidified. Since the ink receiver 102 can be automatically cleaned by movement of the wiper member 104, the cleaning time and labor for manually cleaning the ink receiver 102 can be suitably reduced. Moreover, it is possible to conduct the collection of waste ink all over the printing area at a side behind the medium, thereby removing the waste ink at the same time of printing, for example. Therefore, stacking and solidification of ink can be suitably prevented.
Hereinafter, the control of movement of the wiper member 104 by the controller 18 will be further described in detail. In this example, the controller 18 controls the wiper member 104 to operate, for example, when the printing apparatus 10 (see FIG. 1) conducts printing operation. Accordingly, the wiper member 104 removes ink in real time during the printing operation.
The controller 18 may control the wiper member 104 to operate in response to depression of a button or the like during maintenance of the printing apparatus, for example. In this case, the depression of the button or the like makes the wiper member 104 start to remove ink. The controller 18 may control the wiper member 104 to operate at regular time intervals for example when the printer apparatus is in stand-by state (sleeping state). Accordingly, it is possible to suitably prevent the solidification of residual ink in an unattended environment, i.e. without any user.
In this example, the controller 18 changes the stand-by position of the wiper member 104 for every operation in which the wiper member 104 travels a predetermined amount. The stand-by position of the wiper member 104 is a position within the ink receiver where the wiper member 104 stands by when it is not in operation. For example, the controller 18 changes the stand-by position in a random manner every time when stopping the wiper member 104 after the operation.
When the wiper member 104 is stopped to stand by, ink adhering to a portion directly below the wiper member 104 may be solidified in the stand-by position. According to this example, however, even though the ink adhering to a portion directly below the wiper member 104 is solidified, the position where ink is solidified is distributable. Therefore, it is possible to suitably prevent the problem caused due to stacking of solidified ink. Further, it is therefore possible to suitably remove waste ink.
FIG. 5 and FIG. 6 are perspective views schematically showing an example of specific structure of the driving section 106 with the ink receiver 102, the wiper member 104, and the wire 108. FIG. 5 is a perspective view of an upper side of the ink receiver 102 as seen diagonally from rear left. FIG. 6 is a perspective view of a bottom side of the ink receiver 102 as seen diagonally from front right.
In this example, the driving section 106 includes a driving motor 206, a motor pinion gear 305, a drive gear 311, a power transmitting shaft 308, a drive gear 312, a motor timing control fin 315, a torque limiter 309, a motor control photosensor 314, two idler gears 313, a drum drive gear 307, a drum shaft 306, a wire drum 208, pulleys 310, a turn-around pulley 106a, and turn-around pulleys 106b. 
Among them, the driving motor 206, the motor pinion gear 305, the drive gear 311, the power transmitting shaft 308, the drive gear 312, the motor timing control fin 315, the torque limiter 309, the motor control photosensor 314, and the two idler gears 313 are disposed on the main body 12 (see FIG. 1). The drum drive gear 307, the drum shaft 306, the wire drum 208, the pulleys 310, the turn-around pulley 106a, and the turn-around pulleys 106b are disposed on the ink receiving unit 14. These components other than the turn-around pulley 106a and the turn-around pulleys 106b are disposed on one end side of the ink receiving unit 14. The turn-around pulley 106a and the turn-around pulleys 106b are disposed on the other end side of the ink receiving unit 14, i.e. the opposite side of the ink receiver 102.
The driving motor 206 is a motor which rotates in response to command of the controller 18. The motor pinion gear 305 is attached to the rotary shaft of the driving motor 206 so that the motor pinion gear 305 rotates according to the rotation of the driving motor 206. The drive gear 311 meshes with the motor pinion gear 305 so that the drive gear 311 rotates according to the rotation of the motor pinion gear 305. The power transmitting shaft 308 is a shaft for holding the drive gear 311. The power transmitting shaft 308 also holds the drive gear 312, the torque limiter 309, and the motor timing control fin 315 coaxially with the drive gear 311. Accordingly, the drive gear 312 and the motor timing control fin 315 rotate according to the rotation of the drive gear 311. The torque limiter 309 limits the rotary torque of the drive gear 311. The motor control photosensor 314 is a sensor for detecting the rotation speed of the motor timing control fin 315 and feeding back the detection result to the controller 18. Based on the rotation speed detected by the motor control photosensor 314, the controller 18 controls the output to the driving motor 206.
The two idler gears 313 are gears for alignment of the drum drive gear 307. For mounting the ink receiving unit 14 to the main body 12, the two idler gears 313 mesh with the drum drive gear 307 on the ink receiving unit 14 and the drive gear 312 on the main body 12. Accordingly, the drum drive gear 307 rotates according to the rotation of the drive gear 312. The drum shaft 306 is a shaft for holding the drum drive gear 307 and the wire drum 208 coaxially. The wire drum 208 is a drum on which the wire 108 is wound. As the wire drum 208 rotates according to the rotation of the drum drive gear 307, the wire drum 208 moves the wire 108, to which the wiper member 104 is attached, according to the output of the driving motor 206. The pulleys 310 are disposed between the wire drum and the ink receiver 102 and cooperate together with the turn-around pulley 106a and the turn-around pulleys 106b, arranged on the opposite side of the ink receiver 102, to position the wire 108 such that the wire 108 extends along the ink receiver 102 with some tension.
In this example, the wiper member 104 can be suitably operated by the driving section 106 moving the wire 108. Therefore, the ink in the ink receiver 102 can be suitably removed. Also in this example, the driving motor 206 and the wire drum 208 are positioned such that their rotary shafts extend parallel to each other. In addition, the rotary shafts of the respective gears between the driving motor 206 and the wire drum 208 also extend parallel to each other. According to this example, the power of the driving motor can be reliably transmitted to the wire drum with a simple structure.
Further in this example, the rotary shafts of the driving motor 206 and the wire drum 208, and the rotary shafts of the drive gear 312, the two idler gears 313, and the drum drive gear 307 which are disposed between the driving motor 206 and the wire drum 208 extend parallel to the sub-scanning direction of the printing apparatus 10 (see FIG. 1). The sub-scanning direction is parallel to the direction extending from the front surface to the back surface of the main body 12. According to this example, for example, the ink receiving unit 14 can be suitably mounted to the main body 12 by pushing the ink receiving unit 14 into the main body 12 in a linear manner from the front side of the main body 12. This also facilitates the mounting of the ink receiving unit 14.
In the driving section 106 of this example, one way, to which the wiper member 104 is attached, of a round trip (loop) of the wire 108 tensioned in the ink receiver 102 is set to the center in the width direction of the ink receiver 102. The pulleys 310 are arranged between the wire drum and the ink receiver 102, and the turn-around pulley 106a and the turn-around pulleys 106b are disposed on the opposite side of the ink receiver 102 so that the other way to which the wiper member 104 is not attached (hereinafter, sometimes referred to as “returning way”) is set near the center in the width direction of the ink receiver 102 so that the returning way is located above the wire connecting portion 304 of the wiper member 104.
The widespread portion 302 of the wiper member 104 expands in the width direction of the ink receiver 102. Therefore, the wiper member 104 easily contacts with the returning way of the wire 108 at any portion. As the wiper member 104 and the returning way of the wire 108 contact with each other, the wiper member 104 is subjected to the force in the direction opposite to the advancing direction. If the returning way of the wire 108 is apart from the center in the width direction of the ink receiver 102, large rotary torque is applied to the wiper 104 so that the wiper member 104 may easily rattle during the operation when the wiper member 104 and the returning way of the wire 108 contact with each other.
To solve this problem, in this example, the returning way of the wire 108 is set near the center in the width direction of the ink receiver 102 such that the returning way of the wire 108 is located above the wire connecting portion 304 of the wiper member 104. In this case, even if the wiper member 104 is subjected to the force from the returning way of the wire 108, large rotary torque is difficult to be produced. Therefore, according to this example, the rattling during the operation can be suitably prevented so that the wiper member 104 can suitably travel. This enables further suitable removal of the ink in the ink receiver 102.
FIGS. 7(a) and 7(b) show a second example of specific structure of the ink receiving unit 14. FIG. 7(a) shows the structure of one end side of the ink receiving unit 14 as well as the structure of some components of the main body 12 (see FIG. 1). FIG. 7(b) shows the structure of the other end side of the ink receiving unit 14. Besides points as will be described below, components with the same reference numerals as FIGS. 4(a) and 4(b) are the same components as those in the structure shown in FIGS. 4(a) and 4(b).
In this example, the rotary shaft of the driving motor 206 of the driving section 106 extends parallel to the main scanning direction of the printing apparatus 10 (see FIG. 1). This arrangement can achieve reduction of size in the depth direction of the driving section 106 in the sub scanning direction of the printing apparatus 10. Therefore, according to this example, the size in the depth direction required for installation of the ink receiving unit 14 can be reduced. Further, this arrangement can prevent the printing apparatus 10 from growing in size due to installation of the ink receiving unit 14, for example.
Also in this example, no pulley is arranged between the wire drum 208 and the ink receiver 102. In addition, only one turn-around pulley is arranged on the opposite side of the ink receiver 102. Accordingly, this arrangement can reduce the number of components of the driving section 106. Further, this arrangement can suitably reduce the cost of the ink receiving unit 14, for example.
FIGS. 8(a) and 8(b) schematically show a variation of the structure of the ink receiving unit 14. FIG. 8(a) is a top view of the ink receiving unit 14. FIG. 8(b) is a sectional side view of the ink receiving unit 14. Besides points as will be described below, components with the same reference numerals as FIGS. 4(a) and 4(b) are the same components as those in the structure shown in FIGS. 4(a) and 4(b).
In this example, the ink receiving unit 14 has a belt member 110 as the ink removing means, instead of the wiper member 104 (see FIGS. 4(a) and 4(b)). The belt member 110 is a band-like member having a movable ink receiving surface. In a state that the ink receiving unit 14 is attached to the main body 12, the belt member 110 extends in the main scanning direction over the bottom surface of the gutter-like ink receiver 102. The driving section 106 moves the belt member 110 by a mechanism similar to that for a belt of a moving walkway, a belt conveyor, or the like. Therefore, the belt member 110 moves along the bottom surface of the ink receiver 102 so as to remove the ink in the receiver 102. Also according to this example, the ink in the ink receiver 102 can be suitably removed.
Though the present invention has been described with regard to the embodiments, the technical scope of the present invention is not limited to the scope described in the aforementioned embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be applied to the aforementioned embodiments. It is apparent from the claims of the present invention that embodiments with such modifications and improvements are within the technical scope of the present invention.
The embodiments of the present invention can be suitably applied to a printing apparatus, for example.
It should be noted that the exemplary embodiments depicted and described herein set forth the preferred embodiments of the present invention, and are not meant to limit the scope of the claims hereto in any way. Numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.

## Claims

1. An ink receiving unit for an inkjet printer having an inkjet head configured to eject ink onto a first surface of a medium, said ink receiving unit comprising:
an ink receiver configured to face the inkjet head via the medium, said ink receiver being configured to receive ink dripping from a second surface opposite to the first surface of the medium during printing; and
an ink removing device configured to remove the ink from said ink receiver,
wherein said ink receiver unit is configured to be detachably mounted to a main body to which the inkjet head is mounted,
wherein said ink receiver has a gutter-shaped member configured to receive the ink dripping from the second surface,
wherein said ink removing device has a wiper member slidably provided in said gutter-shaped member, said wiper member being configured to be slid along said gutter-shaped member by a driving motor, and
wherein said ink removing device further includes a controller, the controller being configured to control the wiper member to slide in said gutter-shaped member in a state where said ink receiver faces the inkjet head via the medium and the inkjet head ejects ink onto the medium.

2. The ink receiving unit as claimed in claim 1,
wherein the ink receiving unit is configured to be used in the inkjet printer having a main scanning direction along which the inkjet head moves during a scanning type printing, the ink receiving unit further comprising:
said gutter-shaped member extending in said main scanning direction;
said wiper member configured to be slidable in said gutter-shaped member along said main scanning direction;
a wire extending along said gutter-shaped member and configured to move said wiper member along said gutter-shaped member; and
a wire drum on which said wire is wound and configured to move said wire and said wiper member along said gutter-shaped member according to output power of the driving motor to be provided in the main body, and

wherein, in a state that said ink receiving unit is mounted to the main body, a rotary shaft of said driving motor and a rotary shaft of said wire drum are provided substantially in parallel to a sub scanning direction perpendicular to said main scanning direction.

3. The ink receiving unit as claimed in claim 1,
wherein the ink receiving unit is configured to be used in the inkjet printer having a main scanning direction along which the inkjet head moves during a scanning type printing, the ink receiving unit further comprising:
said gutter-shaped member extending in said main scanning direction;
said wiper member configured to be slidable in said gutter-shaped member along said main scanning direction;
a wire extending along said gutter-shaped member and configured to move said wiper member along said gutter-shaped member; and
a wire drum on which said wire is wound and configured to move said wire and said wiper member along said gutter-shaped member according to output power of the driving motor to be provided in the main body, and

wherein in a state that said ink receiving unit is mounted to the main body, a rotary shaft of said wire drum is provided substantially in parallel to a sub scanning direction perpendicular to said main scanning direction and a rotary shaft of said driving motor is provided substantially in parallel to said main scanning direction.

4. An inkjet printer comprising:
a main body;
an inkjet head mounted to the main body and configured to eject ink onto a first surface of a medium; and
an ink receiving unit as claimed in claim 1.

5. The inkjet printer as claimed in claim 4,
wherein the inkjet printer further comprises,
a main scanning direction along which the inkjet head moves during a scanning type printing; and
a driving motor provided in the main body,

wherein the ink receiving unit further comprises,
said gutter-shaped member extending in said main scanning direction;
said wiper member configured to be slidable in said gutter-shaped member along said main scanning direction;
a wire extending along said gutter-shaped member and configured to move said wiper member along said gutter-shaped member; and
a wire drum on which said wire is wound and configured to move said wire and said wiper member along said gutter-shaped member according to output power of the driving motor, and

wherein, in a state that said ink receiving unit is mounted to the main body, a rotary shaft of said driving motor and a rotary shaft of said wire drum are provided substantially in parallel to a sub scanning direction perpendicular to said main scanning direction.

6. The inkjet printer as claimed in claim 4,
wherein the inkjet printer further comprises,
a main scanning direction along which the inkjet head moves during a scanning type printing; and
a driving motor provided in the main body,

wherein the ink receiving unit further comprises,
said gutter-shaped member extending in said main scanning direction;
said wiper member configured to be slidable in said gutter-shaped member along said main scanning direction;
a wire extending along said gutter-shaped member and configured to move said wiper member along said gutter-shaped member; and
a wire drum on which said wire is wound and configured to move said wire and said wiper member along said gutter-shaped member according to output power of the driving motor, and

wherein in a state that said ink receiving unit is mounted to the main body, a rotary shaft of said wire drum is provided substantially in parallel to a sub scanning direction perpendicular to said main scanning direction and a rotary shaft of said driving motor is provided substantially in parallel to said main scanning direction.

7. The inkjet printer as claimed in claim 4,
wherein the inkjet printer has a main scanning direction along which the inkjet head moves during a scanning type printing,
wherein the ink receiving unit further comprises,
said gutter-shaped member extending in said main scanning direction; and
said wiper member configured to be slidable in said gutter-shaped member along said main scanning direction, and

wherein the inkjet printer further comprises a controller, the controller being configured to control operations of said wiper member in said main scanning direction and to set different stand-by positions of said wiper member along said main scanning direction between the operations.

8. The inkjet printer as claimed in claim 5,
wherein the inkjet printer further comprises a controller, the controller being configured to control operations of said wiper member in said main scanning direction and to set different stand-by positions of said wiper member along said main scanning direction between the operations.

9. The inkjet printer as claimed in claim 6,
wherein the inkjet printer further comprises a controller, the controller being configured to control operations of said wiper member in said main scanning direction and to set different stand-by positions of said wiper member along said main scanning direction between the operations.

10. The ink receiving unit as claimed in claim 1, wherein said wiper member is configured to forcibly wipe ink from said gutter-shaped member as said wiper member slides along said gutter-shaped member.

11. The ink receiving unit as claimed in claim 1, wherein said gutter-shaped member has an ink discharge port configured to discharge ink received in said gutter-shaped member.

12. The ink receiving unit as claimed in claim 11, wherein said wiper member is configured to forcibly wipe ink toward said ink discharge port.

13. The ink receiving unit as claimed in claim 1, wherein said wiper member is substantially T-shaped and includes a widespread portion that extends a width direction of said gutter-shaped member.

14. The ink receiving unit as claimed in claim 1, wherein said wiper member is configured to slide against a surface of said gutter-shaped member.

15. An ink receiving unit for an inkjet printer having an inkjet head configured to eject ink onto a first surface of a medium, said ink receiving unit comprising:
an ink receiver configured to face the inkjet head via the medium, said ink receiver being configured to receive ink dripping from a second surface opposite to the first surface of the medium during printing; and
an ink removing device configured to remove the ink from said ink receiver,
wherein the ink receiving unit is configured to be used in the inkjet printer having a main scanning direction along which the inkjet head moves during a scanning type printing,
wherein said ink receiver is configured to be detachably mounted to a main body to which the inkjet head is mounted,
wherein said ink receiver has a gutter-shaped member, said gutter-shaped member extending in said main scanning direction,
wherein said ink removing device has a wiper member slidably provided in said gutter-shaped member, said wiper member being configured to be slid in said receiver along said main scanning direction so as to remove the ink in said ink receiver,
wherein said ink removing device further comprises a controller, the controller being configured to control operations of said wiper member in said main scanning direction and to set different stand-by positions of said wiper member in said ink receiver along said main scanning direction between the operations, and
wherein the controller is configured to control the wiper member to slide in said gutter-shaped member in a state where said ink receiver faces the inkjet head via the medium and the inkjet head ejects ink onto the medium.

16. The ink receiving unit as claimed in claim 15, wherein said wiper member is configured to forcibly wipe ink from said gutter-shaped member as said wiper member slides along said gutter-shaped member.

17. The ink receiving unit as claimed in claim 15, wherein said gutter-shaped member has an ink discharge port configured to discharge ink received in said gutter-shaped member.

18. The ink receiving unit as claimed in claim 17, wherein said wiper member is configured to forcibly wipe ink toward said ink discharge port.

19. The ink receiving unit as claimed in claim 15, wherein said wiper member is substantially T-shaped and includes a widespread portion that extends a width direction of said gutter-shaped member.

20. The ink receiving unit as claimed in claim 15, wherein said wiper member is configured to slide against a surface of said gutter-shaped member.