JPH03142247A - inkjet recording device - Google Patents

Abstract

PURPOSE:To absorb the ink adhered to a roller thereby to prevent the transfer of the ink to a recording medium by bringing at least a part of the roller of a pair of rollers which is in contact with a recording surface of the recording medium into contact with a water absorbing member. CONSTITUTION:A pair of rollers 4, 5 are arranged downstream in the transfer direction of a recording medium 2 of a recording head so as to impress the transfer force to the recording medium 2 after recording. These rollers 4, 5 are pressed in contact with the front and rear surfaces of the recording medium 2. The roller 5 in contact with the front surface (recording surface) of the recording medium 2 is constituted of a toothed-wheellike spur. A water absorbing member 6 as a cleaning member is held in touch with an outer peripheral surface of the roller 5 which is in contact with the recording surface. Since the member 6 having water absorbing property is brought into touch with at least a part of the roller 5 in contact with the recording surface among the pair of rollers 4, 5 transferring the recording medium 2 after recording, the ink transferred and adhered to the roller 5 from the recording medium 2 can be absorbed by the water absorbing member 6. Accordingly, the ink is prevented from being transferred onto the recording medium 2 again.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an inkjet recording device that performs recording by ejecting recording droplets from a recording head onto a recording medium, and particularly relates to a recording medium transport mechanism of the inkjet recording device. Regarding the structure of

[Conventional technology]

Recording devices such as printers, facsimiles, and copiers are forced to form an image on a recording medium that corresponds to the recorded information by driving the energy generating means of the recording head based on the recorded information. Depending on the structure of the recording head, it can be divided into inkjet type, wire dot type, thermal type, laser beam type, etc.

An inkjet type (inkjet recording device) supplies recording liquid (ink) to a recording head and drives recording droplet (ink droplet) ejection means such as an electrothermal transducer or an electromechanical transducer provided in the recording head. Accordingly, an image is formed by depositing recording droplets (ink droplets) on a recording medium such as paper or a thin plastic plate.

A plurality of ink ejection ports are usually arranged on the front surface of the print head (the surface facing the print medium), and there is a gap of, for example, about 0.5 to 1.0 seconds between the ejection port surface and the print medium. It is provided.

In a color inkjet recording apparatus that performs color recording, a plurality of recording heads corresponding to the number of ink colors such as yellow, magenta, cyan, and black are used, for example.

Furthermore, in a carriage scanning type printing apparatus, these print heads are mounted on a carriage that reciprocates along the print medium.

The supplied recording medium is conveyed at a predetermined pitch to the recording section facing the recording head by a conveyance roller driven by a feed motor, and the recorded recording medium is conveyed by a pair of rollers disposed downstream of the recording head. (paper ejection roller).

[Technical problem to be solved by the invention] In this type of inkjet recording device, especially when used in a high-humidity environment or when performing high-density recording, the ink on the recording medium dries. However, there is a technical problem in that the roller on the recording surface side of the roller pair that conveys the recording medium on the downstream side of the recording head is stained with ink, and this is transferred and the recording medium is also stained.

Therefore, in conventional recording apparatuses, in order to reduce the stains caused by the transfer, a gear-shaped spur has usually been used as a roller on the recording surface side.

However, even on spurs, if ink gets on them,
There was a technical problem in that this ink was transferred to the recording medium, resulting in spots of dirt.

In addition, if the spur does not have a drive, the dirt may become linear instead of dotted, and the degree of dirt may become large.

The present invention has been made in view of the above-mentioned conventional technical problems, and provides an inkjet recording device that can prevent ink stains on a recording medium caused by a conveyance roller downstream of a recording head even when ink on the recording medium is difficult to dry. The purpose is to provide

[Means for solving problems]

The invention according to claim 1 provides an inkjet recording system configured to perform recording by ejecting recording droplets from a recording head onto a recording medium, and to transport the recording medium after recording by a pair of rollers on the downstream side of the recording head. In the apparatus, by configuring the water absorbing member to contact at least a portion of the roller on the recording surface side of the roller pair that contacts the recording surface,
It absorbs ink adhering to the roller and prevents the ink from being transferred to the recording medium.

According to a second aspect of the invention, the water-absorbing member is a driven roller, so that the contact positions are dispersed and the transfer of the ink is more reliably prevented.

The invention according to claim 3 is an inkjet recording device configured to perform recording by ejecting recording droplets onto a recording medium from a recording head, and to transport the recording medium after recording by a pair of rollers on the downstream side of the recording head. In the apparatus, the roller on the recording surface side of the pair of rollers is composed of a first spur, and there is a gap between the recording head and the first spur to the same extent as the recording head with respect to the recording medium. By providing a second spur disposed, and providing a roller that is engaged with both the first spur and the second spur, and at least a portion that engages with the spur is formed of a water-absorbing material. , the ink transfer from the recording medium to the conveyance roller and the ink transfer from the conveyance roller to the recording medium are minimized or eliminated, and ink stains on the recording medium are prevented.

The invention of claim 4 further provides the first spur and the second spur.
By configuring that the spurs of are not on the same line, −1i
In fact, it prevents ink stains on the recording medium.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic vertical cross-sectional view showing the main parts of a first embodiment of an inkjet recording apparatus according to the present invention.

In FIG. 1, the inkjet recording apparatus is configured to perform recording by ejecting recording droplets from a recording head l onto a recording medium 2 such as paper or a plastic WI board.
A platen 3 is arranged at a position facing the recording disk 1.

The recording medium 2 is brought into close contact with the platen 3, and there is, for example, 0°5 to 1,
It is transported with a gap of Oo*.

On the downstream side of the recording head 1 in the direction of conveyance of the recording medium 2, there is a pair of rollers 4 for applying conveyance force to the recording medium 2 after recording.
．． 5 is placed.

The pair of rollers 4.5 are brought into pressure contact with the front and back sides of the recording medium 2, and the roller 5 that contacts the front surface (recording surface) is made of gear-shaped spurs.

Therefore, a water-absorbing member 6 as a cleaning member is brought into contact with the portion of the roller (spur) 5 that contacts the recording surface, that is, the outer peripheral surface.

The water absorbing member 6 is made of a sponge-like porous material,
In the embodiment shown in FIG. 1, the rectangular parallelepiped water-absorbing member 6 is
are arranged so that they are in sliding contact.

In this way, the inkjet recording apparatus according to the present invention performs recording by ejecting recording droplets from the recording head l onto the recording medium 2, and the roller pair 4.5 on the downstream side of the rad l performs recording after recording. In an inkjet recording apparatus configured to convey a medium 2, the pair of rollers 4
．． An inkjet recording apparatus is provided in which a water-absorbing member 6 is brought into contact with at least the portion (outer peripheral surface) of the roller 5 on the recording surface side that contacts the recording surface.

According to the embodiment described above, the water-absorbing member 6 is brought into contact with at least the portion of the roller 5 on the recording surface side of the roller pair 4.5 that conveys the recording medium 2 after recording, which contacts the recording surface. Therefore, from the recording medium 2 to the spur 5 (transport roller side)
The adhering ink transferred onto the recording medium 2 can be absorbed by the water-absorbing member 6, and therefore, the ink can be prevented from being transferred onto the recording medium 2 again.

In this way, even if the ink on the recording medium 2 is not completely dried, it is possible to eliminate ink stains on the recording medium 2 caused by the conveyance roller 4.5.

FIG. 2 shows a second inkjet recording apparatus according to the present invention.
FIG. 3 is a vertical cross-sectional view showing the main parts of the embodiment.

In this embodiment, the water absorbent member 6 as the cleaning member is shaped like a roller, and the outer circumferential surface of the water absorbent member 6 is brought into pressure contact with the outer circumference of the spur 5 to be driven to rotate (by a driven roller). It is.

The second embodiment shown in FIG. 2 differs from the first embodiment shown in FIG. 1 only in this point, and other parts have substantially the same structure as the case shown in FIG. They will be indicated by the same numbers and their detailed explanation will be omitted.

According to this second embodiment, in addition to obtaining the same effects as described above, the roller (driven roller) that rotates the water absorbing member 6 in a driven manner
Since the water absorbing member 6 was formed with the above material, the water absorbing member 6 always came into contact with the spur 5 at different locations, and was able to maintain a high absorption capacity even against continuous ink stains.

FIG. 3 shows the third part of the inkjet recording apparatus according to this embodiment.
FIG. 3 is a vertical cross-sectional view showing the main parts of the embodiment.

In FIG. 3, the inkjet recording apparatus is configured to perform recording by ejecting recording droplets from a recording head 1 onto a recording medium 2 such as paper or a thin plastic plate, and is configured to perform recording by jetting recording droplets from a recording head 1 onto a recording medium 2 such as paper or a thin plastic plate. A platen 3 is placed at the position.

The recording medium 2 is conveyed in close contact with the platen 3 with a gap of, for example, 0.5 to 1.0 degrees between the recording medium 2 and the ejection opening surface of the recording disk 1.

Recording medium 2 of Rad 1 to the said record! A pair of rollers 4.5 for applying a conveying force to the recording medium 2 after recording is arranged on the downstream side in the conveying direction.

The pair of rollers 4, → are pressed against the front and back surfaces of the recording medium 2, and the roller 5 that contacts the front surface (recording surface) is composed of a gear-shaped spur (first spur).

Further, between the recording head 1 and the first spur 5, a gap of the same extent (for example, 0.5 to 1.0 mm) as the recording head 1 is arranged with respect to the recording medium 2. A rotatable second spur 7 is provided.

Therefore, the roller 8, which is engaged with both the first spur 5 and the second spur 7 and whose at least the portion that engages with these spurs is formed of a water-absorbing material, is rotatably (
(like a driven roller or driven roller).

The water-absorbing member 6 can be made of, for example, a sponge-like porous material.

(A) in FIG. 3 shows a state in which the leading edge of the recording medium 2 has reached the second spur 7 but has not yet reached the first spur 5, and (B) in FIG. ) shows a state in which the recording medium 2 passes through the pair of rollers 4.5 and is being actively conveyed by the pair of rollers 4.5.

According to the embodiment described above with reference to FIG. 3, since the second spur 7 is provided between the recording head 1 and the first spur 5 for conveyance (sheet ejection), the recording medium 2 can be moved more accurately. The paper can be discharged while being guided, and furthermore, a water-absorbing cleaning roller 8 engaged with both the first spur 5 and the second spur 7 is rotatably supported and disposed. So,
Even if the ink on the recording surface is transferred to the second guiding spur 7, the ink adhering to the outer peripheral teeth is absorbed by the rollers 8 and is not transferred to the recording medium 2 again.

In this way, ink stains on the recording medium 2 caused by the second spur 7 can be eliminated.

Furthermore, even if the ink on the recording medium 2 is transferred to the first conveying spur 5, the ink adhering to the outer teeth of the spur 5 is absorbed by the water-absorbing cleaning roller 8, so that it can be reused again. It will not be transferred to the recording surface and stain the recording medium 2.

As the material for the roller surface of the roller 8, a polyurethane sponge or the like having excellent water absorption performance and drive transmission performance can be used.

FIG. 4 is a plan view showing the arrangement of the first spur 5, the second spur 7, and the roller 8 when viewed from the line IV-IV in FIG.

The first spur 5 and the second spur 8 can be arranged on a straight line, but as shown in FIG. By doing so, the ink-absorbing areas on the circumferential surface of the roller 8 can be dispersed,
It becomes possible to maintain the ink absorbing ability of the roller 8 for a long period of time.

In addition, in the case of the TL shown in FIG. 3, the paper discharge roller 4 is usually
is used as a driving roller, but when implementing the present invention, the first spur 5 can be used as a driving roller and the paper discharge roller 4 can be used as a driven roller.

Further, the second guiding spur 7 is used as a driving roller, and the first spur 7 is used as a driving roller.
It is also possible to configure the second spur 7 to rotate the second spur 5 and the paper discharge roller 4 .

〔Effect of the invention〕

As is clear from the above description, according to the invention of claim 1, recording is performed by ejecting recording liquid droplets onto a recording medium from a recording head, and a pair of rollers on the downstream side of the recording head performs recording on the recording medium after recording. In the inkjet recording apparatus configured to convey the ink, the water-absorbing member is brought into contact with at least the portion of the roller on the recording surface side of the pair of rollers that contacts the recording surface, so that the ink does not dry on the recording medium. Provided is an inkjet recording apparatus that can prevent ink stains on the recording medium even when the recording medium is conveyed in this state.

According to the invention of claim 2, in addition to the above configuration, the water absorbing member is configured to be a driven roller, so that the absorbing ability of the water absorbing member is further increased even against continuous ink stains. Can be done.

According to the third aspect of the present invention, recording is performed by jetting recording droplets onto a recording medium from a recording head, and the recording medium is conveyed after recording by a pair of rollers on the downstream side of the recording head. In the inkjet recording apparatus, the roller on the recording surface side of the pair of rollers is constituted by a first spur, and between the recording head and the first spur, there is a distance between the recording medium and the recording head. A configuration in which a second spur is disposed with a gap of , and a roller is provided that engages with both the first spur and the second spur, and at least a portion that engages with the spur is formed of a water-absorbing member. Therefore, not only when the ink on the recording medium is transferred to the first spur for conveyance, but also when transferred to the second spur for guiding, the ink adhering to each spur can be simultaneously absorbed. Provided is an inkjet recording apparatus that can prevent staining of a recording medium due to retransfer.

According to the invention of claim 4, in addition to the above-mentioned tata, since the first spur and the second spur are not on the same line, the ink absorption ability of the roller can be maintained for a long time. Effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view schematically showing the main part of a first embodiment of an inkjet recording apparatus according to the present invention, and FIG. 2 is a partial vertical cross-sectional view schematically showing the main part of a second embodiment of the present invention. 3 schematically shows the main part of the third embodiment of the present invention, and (A
) is a vertical cross-sectional view showing a state in which the recording medium has not yet reached the roller pair for paper ejection, and (B) is a longitudinal sectional view showing a state in which the recording medium is being conveyed by the pair of rollers for paper ejection. 3 is a schematic plan view showing the arrangement of the first spur and the second spur in FIG. 3. FIG. 1-...-recording head, 2--recording medium, 4--discharging roller, 5-----spur (first spur), 6----- m-water absorbing member, 7...-second
Spur, 8...-colo (water-absorbing member).

Claims (4)

[Claims] (1) In an inkjet recording apparatus configured to perform recording by ejecting recording droplets onto a recording medium from a recording head, and to transport the recording medium after recording by a pair of rollers downstream of the recording head, the An inkjet recording apparatus characterized in that a water-absorbing member is brought into contact with at least a portion of the roller on the recording surface side of the roller pair that contacts the recording surface. (2) The inkjet recording apparatus according to claim 1, wherein the water-absorbing member is a driven roller. (3) In an inkjet recording apparatus configured to perform recording by ejecting recording droplets onto a recording medium from a recording head, and to transport the recorded recording medium by a pair of rollers downstream of the recording head, The roller on the recording surface side of the roller pair is constituted by a first spur, and a first spur is disposed between the recording head and the first spur with a gap of the same size as that of the recording head with respect to the recording medium. Set up 2 spurs,
An inkjet recording apparatus characterized in that a roller is provided that engages with both the first spur and the second spur, and at least a portion that engages with the spur is formed of a water-absorbing member. (4) The inkjet recording apparatus according to claim 3, wherein the first spur and the second spur are not on the same line.