JP3918904B2 - Platen and recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
A platen that faces a recording head that reciprocates in the main scanning direction and supports a recording material conveyed in the sub-scanning direction from below, and defines a gap between the recording material and the recording head, and The present invention relates to a recording apparatus provided.
[0002]
[Prior art]
A platen that faces the recording head and supports the recording material from below and defines a gap between the recording material and the recording head has a plurality of ribs that are protrusions of a static structure. Then, the recording material is conveyed by sliding on the top surfaces of the plurality of ribs. In addition, the recording material is reversely warped by the conveying roller in order to prevent the recording material from floating from the platen due to the cockling phenomenon that the recording material becomes wet and deforms by being wet with ink, By allowing the recording material to be pressed against the rib, the posture of the recording material is regulated until the leading end of the recording material reaches the discharge roller. Furthermore, the recording material is also warped reversely in the discharge roller so that the recording material is pressed against the rib, thereby regulating the posture of the recording material even after the trailing edge of the recording material passes through the conveyance roller. The recording material is prevented from floating from the platen due to the cockling phenomenon.
[0003]
[Problems to be solved by the invention]
However, when recording with a very small margin is performed on the leading edge and the trailing edge of the recording material, the leading edge portion and the vicinity of the trailing edge of the recording material wet with ink are deformed to be rounded downward due to the cockling phenomenon. Further, the conventional platen cannot regulate the posture of the recording material with respect to the deformation in which the vicinity of the front end portion and the rear end portion of the recording material wetted with ink is rounded downward, so that the recording material is made of the platen. This raises the problem that the recording accuracy is lowered. In addition, the ribs of the conventional platen have a static structure against the elongation of the recording material in the sub-scanning direction when the recording material elongates due to the cockling phenomenon and wets with ink. In this case, the wavy deformation of the recording material due to the cockling phenomenon is promoted by the friction between the recording material and the rib. As a result, the wavy deformation of the recording material is increased, the recording material is lifted, and the recording accuracy is lowered.
[0004]
An object of the present invention is to eliminate a problem caused by the static structure of the platen, thereby preventing a decrease in recording accuracy due to the recording material floating from the platen caused by deformation of the recording material due to cockling phenomenon. And providing a recording apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 of the present application includes a recording head that reciprocates in the main scanning direction, a conveyance roller that conveys the recording material in the sub-scanning direction, and a recording material in the sub-scanning direction. A discharge roller for discharging, and a platen for supporting the recording material conveyed in the sub-scanning direction by the conveying roller or the discharging roller from below and defining a gap between the recording material and the recording head. A recording apparatus that performs recording by ejecting ink to the recording material conveyed in the sub-scanning direction by the conveying roller or the discharge roller by the recording head, wherein the platen is parallel to the main scanning direction. The rotating body is driven by a driving source using a rotating shaft and is rotated, and is configured by a plurality of rotating bodies that are spaced apart from each other in the main scanning direction, and the plurality of rotating bodies are generated by a cockling phenomenon. The conveying roller is disposed at an upstream side in the sub-scanning direction with respect to the platen and pressed against the platen by reversely warping the recording material. The discharge roller is disposed downstream of the platen in the sub-scanning direction, and conveys the recording material in the sub-scanning direction while pressing the recording material against the platen. When the recording material is executed without a margin at the leading edge and the trailing edge of the recording material, the rotating body moves in the sub-scanning direction while the recording material is being conveyed by the conveying roller. The recording apparatus is characterized in that the rotation of the rotating body is stopped while the recording material is rotated only by the discharge roller and is rotated at the same speed.
[0006]
As a result, the recording material is conveyed in contact with the rotating body, and the rotating body rotates in accordance with the conveyance of the recording material, so that there is almost no friction between the recording material and the rotating body. According to the platen according to the first aspect of the present invention, the wavy deformation of the recording material due to the cockling phenomenon is not promoted, and the deterioration of the recording accuracy caused by the floating of the recording material can be prevented. I can do it.
[0009]
The invention according to claim 2 of the present application is that, in claim 1, the platen has a rotating shaft, the rotating body has a disk shape, and the rotating body is located on the rotating shaft at a center point of the rotating body. The recording apparatus is characterized by being fixed.
[0010]
The rotating body is fixed to the rotating shaft at the center point of the rotating body, and the recording material is conveyed while being in contact with the rotating body. Thus, according to the recording apparatus of the present invention, The same effect as that of the recording apparatus according to the first aspect can be obtained.
[0011]
According to a third aspect of the present invention, in the second aspect of the present invention, when the platen records without margin on the end portion of the recording material, the ink removed from the end portion and discarded is a plurality of the rotations. A recording apparatus characterized by having a structure of falling between bodies.
[0012]
In the recording apparatus according to the third aspect of the present invention, when recording without a margin on the end portion of the recording material, the ink that has been removed from the end portion and dropped is dropped between the plurality of rotating bodies. By having the structure, in addition to the function and effect of the recording apparatus according to the second aspect of the present invention, it is possible to record without margins on the end of the recording material.
[0013]
The invention according to claim 4 of the present application is the ink cartridge according to claim 3, wherein the platen is removed from the end of the recording material without being blanked when the recording is performed on the end of the recording material, and the ink attached to the platen is removed. The recording apparatus is characterized in that it is removed by the adhering ink removing means provided in the recording apparatus.
[0014]
When recording on the end of the recording material without a margin, a part of the ink that is removed from the end and is discarded adheres to the platen. When the recording material is conveyed on the platen to which the ink has adhered, the adhered ink adheres to the recording material, and the recording material is soiled. Therefore, the ink adhering to the platen is removed by the adhering ink removing means provided in the recording apparatus, so that it becomes possible to prevent the recording material from being stained. Thus, according to the recording apparatus according to the fourth aspect of the present invention, in addition to the operational effect of the recording apparatus according to the third aspect of the present application, the operational effect of preventing the recording material from being soiled by the discarded ink. Is obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a state in which recording is performed without a margin at the leading edge of a recording sheet in an ink jet printer according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view thereof. Hereinafter, a description will be given with reference to FIGS. 1 and 2. 1 and 2 show only components necessary for the description, and other components are omitted.
[0020]
The ink jet printer according to this embodiment includes a recording head 2 that reciprocates in the main scanning direction X, a conveyance roller 3 that conveys the recording material P in the sub-scanning direction Y, and discharges the recording material P in the sub-scanning direction Y. And a platen 1 that faces the recording head 2 and supports the recording material P from below and defines a gap between the recording material P and the recording head 2. A large number of dot forming element arrays 21 are provided on the surface of the recording head 2 facing the recording material P, and ink 22 is ejected from the dot forming element array 21 onto the recording surface of the recording material P for recording. I do.
[0021]
The conveyance roller 3 is rotationally driven by a drive source, and is individually urged by the conveyance drive roller 31 that conveys the recording material P in contact with the lower surface of the recording material P, and the recording material P. And a plurality of conveyance driven rollers 32 that rotate following the conveyance of the recording material P. The discharge roller 4 is rotationally driven by a drive source, is in contact with the lower surface of the recording material P and discharges the recording material P, and is individually urged by the discharge driving roller 41 to record the recording material. In contact with the top surface of the material P, the recording material P is driven to rotate, rotates, has a plurality of teeth around it, and acutely so that the tip of each tooth makes point contact with the printing surface of the recording material. It comprises a plurality of discharge driven rollers 42 by pointed toothed rollers (also referred to as “giza rollers” or “star wheels”).
[0022]
In order to prevent the recording material P from floating from the platen 1 due to the cockling phenomenon that the recording material P gets wet and deforms when it is wet with the ink 22, the recording material P is conveyed by the conveying roller 3. By reversing P so that the recording material P is pressed against the platen 1, the posture of the recording material P is regulated until the leading end of the recording material P reaches the discharge roller 4. Yes. Further, similarly, in the discharge roller 4, the recording material P is reversely warped so that the recording material P is pressed against the platen 1, so that the rear end of the recording material P passes through the conveyance roller 3. After that, the posture of the recording material P is regulated.
[0023]
In such an ink jet printer, the platen 1 according to the present invention includes a rotating body 11 having a plurality of disk shapes fixed to a rotating shaft 12 at a center point of the rotating body 11 so as to be separated from each other in the main scanning direction. Has the structure. Since the rotator 11 has a disk shape, the cross-sectional shape of the rotator 11 cut by a plane parallel to the main scanning direction and passing through the rotation axis 12 of the platen 1 is the same in any cross section. As a result, the surface of the platen 1 that contacts the rotating body 11 and the recording material P always has a constant shape. Therefore, the platen 1 has a dynamic structure in the gap between the recording material P and the recording head 2. However, it is always possible to specify a constant value. In the present embodiment, the cross-sectional outer edge shape of the rotating body 11 cut by a plane parallel to the main scanning direction and passing through the rotation axis 12 of the platen 1 is a rectangle, but if the rotating body 11 is a disk shape, The present invention is not particularly limited to this, and it goes without saying that the present invention can be implemented even if the outer edge shape of the cross section is a trapezoidal shape or a semicircular shape.
[0024]
Further, the arrangement interval of the plurality of rotating bodies 11 is preferably substantially equal to the interval of the undulation of the recording material P caused by the cockling phenomenon, and the lifting of the recording material P is further reduced. I can do it.
[0025]
The platen 1 is rotated by a rotational driving force from a driving source, and the rotating body 11 is configured to rotate in the sub-scanning direction Y at substantially the same speed as the conveyance speed of the recording material P. As described above, since the platen 1 has a dynamic structure by the rotating body 11, the friction between the recording material P and the platen 1 that is reversely warped by the transport roller 3 and pressed against the platen 1. And the elongation of the recording material P in the sub-scanning direction Y due to the cockling phenomenon is not hindered by friction, so that the wavy deformation of the recording material P due to the cockling phenomenon is not promoted. Further, since the rotating body 11 is rotated by the rotational driving force, the recording material P is extended in the sub-scanning direction Y, and the coverage due to the cockling phenomenon that occurs when recording at the front end of the recording material P without a blank space. Since the rounding deformation of the leading end of the recording material P is suppressed, the recording material P can be prevented from being lifted from the platen 1 due to the rounding deformation of the leading end of the recording material P.
[0026]
Furthermore, below the platen 1, when recording without margins on the end of the recording material P, the ink 22 that has been discarded from the end of the recording material P falls continuously in the width direction of the recording material P from which it falls. The ink drop hole 5 is provided, and the platen 1 is configured such that the discarded ink 22 falls between the plurality of rotating bodies 11. An adhering ink removing means 6 made of an ink absorbing material or the like is provided below the ink dropping hole 5 so as to be in contact with the rotating body 11 to absorb the ink dropped into the ink dropping hole 5 and to rotate the rotating body. The abandoned ink 22 adhering to the recording medium 11 is removed from the rotating body 11 to prevent the ink 22 adhering to the rotating body 11 from adhering to the recording material P and causing the recording material P to become dirty.
[0027]
FIG. 3 is a plan view showing a state in which recording is performed without a margin at the rear end of the recording material P in the ink jet printer according to the embodiment of the present invention, and FIG. 4 is a cross-sectional view thereof. In addition, like FIG. 1 and FIG. 2, only the component required for description is shown and the other component is abbreviate | omitted. The description of each component of the ink jet printer is the same as the description of FIGS.
[0028]
When recording with no margin at the rear end of the recording material P, when the recording material P passes through the transport roller 3 and is transported only by the discharge roller 4, the platen 1 stops rotating by the drive source and rotates. Do not. This is because if the rotating body 11 rotates while the recording material P passes through the transport roller 3 and is transported only by the discharge roller 4, the recording material P is prevented from extending in the sub-scanning direction Y due to cockling phenomenon. In this way, the wavy deformation of the recording material P and the rounding deformation of the trailing edge are promoted. By doing so, the discharge roller 4 warps and presses against the platen 1 so as to be pressed. The friction between the recording material P and the platen 1 is increased, and the elongation of the recording material P in the sub-scanning direction Y due to the cockling phenomenon is promoted by the friction. The wavy deformation of the recording material P is suppressed. Further, since the round deformation at the rear end of the recording material P due to the cockling phenomenon that occurs when recording without a margin at the rear end of the recording material P is suppressed, the recording due to the round deformation at the rear end of the recording material P is suppressed. The lifting of the material P from the platen 1 can be prevented.
[0029]
As described above, according to the embodiment shown in FIGS. 1 to 4, by suppressing the deformation of the recording material P caused by the cockling phenomenon, it is caused by the deformation of the recording material P due to the cockling phenomenon. It is possible to prevent the recording accuracy from being lowered due to the recording material P floating from the platen 1.
[0030]
Further, as another embodiment, there is a case of an ink jet printer that does not perform recording with no margin at the end of the recording material P. FIG. 5 is a plan view of an inkjet printer according to another embodiment of the present invention, and FIG. 6 is a sectional view thereof. Hereinafter, a description will be given with reference to FIGS. 5 and 6. 5 and 6 show only components necessary for explanation, and other components are omitted. The description of each component of the ink jet printer is the same as the description of FIGS.
[0031]
The platen 1 has a rotating shaft 12 in the shape of an outer cylindrical body, and the rotating body 11 is a ring-shaped protrusion projecting along the outer edge of the rotating shaft 12 with a uniform width and height in parallel with the sub-scanning direction Y. It is a protrusion. Since the rotating body 11 has a uniform width and height, the cross-sectional shape of the protrusion (rotating body 11) parallel to the main scanning direction and passing through the rotating shaft 12 is the same in any cross section. As a result, the surface of the platen 1 in contact with the projection (rotary body 11) and the recording material P is always in a constant shape, so that the gap between the recording material P and the recording head 2 moves the platen 1. Even a structural structure can always be defined uniformly. In this embodiment, the outer peripheral shape of the cross section of the rotating body 11 passing through the rotary shaft 12 in parallel with the main scanning direction is a rectangle. However, the shape is not particularly limited as long as it has a uniform width and height. However, it goes without saying that the present invention can be implemented even if the outer edge shape of the cross section is a trapezoidal shape or a semicircular shape.
[0032]
Further, the arrangement interval of the plurality of rotating bodies 11 is preferably set to be approximately equal to the interval of the undulation of the recording material P caused by the cockling phenomenon, and thereby the floating of the recording material P is further reduced. I can do it. The platen 1 is rotated by a rotational driving force from a driving source, and the rotating body 11 is configured to rotate in the sub-scanning direction Y at substantially the same speed as the conveyance speed of the recording material P. As described above, since the platen 1 has a dynamic structure by the rotating body 11, the friction between the recording material P and the platen 1 that is reversely warped by the transport roller 3 and pressed against the platen 1. And the elongation of the recording material P in the sub-scanning direction Y due to the cockling phenomenon is not hindered by friction, so that the wavy deformation of the recording material P due to the cockling phenomenon is not promoted. In addition, since the rotating body 11 is rotated by the rotational driving force, the recording material P is promoted to extend in the sub-scanning direction Y. Therefore, there is an effect of suppressing the wavy deformation of the recording material P due to the cockling phenomenon. Further, it is possible to prevent the recording material P from being lifted from the platen 1 due to the undulation deformation at the tip of the recording material P.
[0033]
In this manner, the present invention can be implemented even in an ink jet printer that does not perform recording without margins on the end of the recording material P, and the effects of the present invention can be obtained. In addition, by suppressing the deformation of the recording material P caused by the cockling phenomenon, the deterioration of the recording accuracy due to the floating of the recording material P from the platen 1 caused by the deformation of the recording material P due to the cockling phenomenon is prevented. It becomes possible.
[0034]
Furthermore, as another embodiment, one that does not perform rotational driving by the driving source of the rotating body 11 can be mentioned. Also in this case, since the platen 1 has a dynamic structure by the rotating body 11, it is reversely warped by the conveying roller 3 and pressed between the recording material P contacting the platen 1 and being pressed against the platen 1. Since the friction is reduced and the elongation of the recording material P in the sub-scanning direction Y due to the cockling phenomenon is not hindered by the friction, the wavy deformation of the recording material P due to the cockling phenomenon is not promoted. Therefore, there is an effect of preventing the recording material P from being lifted from the platen 1 due to the wavy deformation of the trailing edge of the recording material P.
[0035]
【The invention's effect】
According to the platen according to the present invention, the deformation of the recording material caused by the cockling phenomenon is suppressed, and the deterioration of the recording accuracy due to the recording material floating from the platen caused by the deformation of the recording material caused by the cockling phenomenon is prevented. It is possible to provide a platen and a recording apparatus.
[Brief description of the drawings]
FIG. 1 is a plan view of a state in which recording is performed without a margin at the leading edge of a recording sheet in an ink jet printer according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state in which recording is performed without a margin on the leading edge of a recording sheet in an ink jet printer according to an embodiment of the present invention.
FIG. 3 is a plan view showing a state in which recording is performed without a margin at the trailing edge of the recording paper in the ink jet printer according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a state in which recording is performed without a margin at the trailing edge of the recording paper in the ink jet printer according to the embodiment of the present invention.
FIG. 5 is a plan view of an ink jet printer according to another embodiment of the present invention.
FIG. 6 is a cross-sectional view of an ink jet printer according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Platen 2 Recording head 3 Conveying roller 4 Discharging roller 5 Ink dropping hole 6 Ink absorber 11 Rotating body 12 Rotating shaft 21 Dot formation element array 31 Conveying driving roller 32 Conveying driven roller 41 Discharging driving roller 42 Discharging driven roller P Recording material X Main scanning direction Y Sub scanning direction

Claims (4)

A recording head that reciprocates in the main scanning direction, a conveyance roller that conveys the recording material in the sub-scanning direction, a discharge roller that discharges the recording material in the sub-scanning direction, and a sub-scanning direction by the conveyance roller or the discharge roller A platen that supports the recording material conveyed from below and defines a gap between the recording material and the recording head, and is conveyed in the sub-scanning direction by the conveying roller or the discharge roller. A recording apparatus for recording on a recording material by discharging ink with the recording head,
The platen is driven and rotated by a driving source with an axis parallel to the main scanning direction as a rotation axis, and is configured by a plurality of rotating bodies arranged apart from each other in the main scanning direction. , Are arranged at intervals equal to the interval of the undulation of the recording material caused by the cockling phenomenon,
The transport roller is disposed upstream of the platen in the sub-scanning direction, and has a configuration for transporting the recording material in the sub-scanning direction while pressing the recording material against the platen.
The discharge roller is disposed downstream of the platen in the sub-scanning direction, and has a configuration in which a recording material is reversely warped and conveyed in the sub-scanning direction while being pressed against the platen.
When recording is performed without a margin at the leading and trailing edges of the recording material, the rotating body is the same as the recording material transport speed in the sub-scanning direction while the recording material is transported by the transport roller. A recording apparatus, wherein the rotating body stops rotating while rotating at a speed and the recording material is conveyed only by the discharge roller.   2. The platen according to claim 1, wherein the platen has a rotating shaft, the rotating body has a disk shape, and the rotating body is fixed to the rotating shaft at a center point of the rotating body. Recording device.   3. The structure according to claim 2, wherein the platen has a structure in which ink that has been removed from the end of the recording material falls between the plurality of rotating bodies when recording without margin on the end of the recording material. A recording device characterized by.   4. The attached ink provided in the recording apparatus according to claim 3, wherein when the platen is recorded on the end portion of the recording material without a margin, the platen is removed from the end portion and discarded. A recording apparatus characterized by being removed by a removing means.

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