JP2003292189A - Ink-jet recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink-jet recording device capable of preventing the failure in recording by inhibiting the change of the transporting amount when an intermediate roller and a spur are used, and properly keeping a distance between a recording head and a recording medium. <P>SOLUTION: A feeding roller 4 is mounted at an upstream side of the recording head 2 between the recording head 2 and a feed tray 3. A pressing roller 14 is placed oppositely to the feeding roller 4, so that the recording medium is held between the feeding roller 4 and the pressing roller 14, and transported by the rotation of the feeding roller 4. A platen 5 is mounted at a lower part of the recording head 2, and an intermediate roller 6 is mounted at a downstream side of the platen 5. A first spur 14 is mounted oppositely to the intermediate roller 5 from its upper part, and the recording medium having passed through the platen 5 from the intermediate roller 6 reaches between the intermediate roller 6 and the first spur 15. An ejecting roller 7 is mounted at the downstream of the intermediate roller 6. A second spur 18 is mounted oppositely to the ejecting roller 7 from its upper part, and the recording medium having passed through the intermediate roller 6 reaches between the ejecting roller 7 and the second spur 18, and ejected by the rotation of the ejecting roller 7. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to conveyance of a recording medium of an inkjet recording device.

[0002]

2. Description of the Related Art Conventionally, in a serial printer such as an ink jet printer, a recording head is mounted on a carriage, dots are formed while scanning in the width direction of a recording medium, and the conveyance of the recording medium and the movement of the carriage are repeated. An image is formed on the recording medium. The recording medium enters a supply roller from a supply unit such as a supply tray, is pushed forward by the rotation of the supply roller, advances to a recording area below the recording head, and image recording is started. A platen is installed below the recording head and serves to guide the recording medium and prevent it from bending. As the recording progresses, the recording medium is further pushed forward and the leading end reaches the discharge roller. Then, the recording medium is sent by both the discharge roller and the supply roller for a while, then the recording medium exits from the supply roller, is conveyed to the end by the discharge roller, and the recorded recording medium is discharged from the printer.

Further, in the ink jet printer, it is more advantageous in recording that the distance (head gap) between the recording head and the recording medium is close to each other so that they do not contact each other.
Therefore, it is important to keep the head gap constant by preventing waviness and flexure associated with the conveyance of the recording medium.

[0004]

In the serial printer having the above-described structure, generally, the recording medium is ejected more than the supply roller in order to surely eject the recording medium on which the recording is completed and to apply the tension to the recording medium to suppress the bending. The conveyance speed of the roller is set higher. For this reason, there is a problem in that when the recording medium is removed from the supply roller, the conveyance speed changes, an error occurs in the conveyance amount, and the print image is disturbed.

Further, in order to prevent the end of the recording medium from the supply roller from floating and damaging the recording head or damaging the head gap, the paper is held at two points in front of the discharge roller (on the recording head side). In order to do that,
It is also practiced to arrange an intermediate conveyance roller having the same structure as the discharge roller. With such a configuration, since the recording medium can be held by the intermediate spur or the intermediate conveying roller and the discharging roller even after passing through the supply roller, the end of the recording medium does not float during recording and the recording head is not damaged. .
However, when only the intermediate spur is arranged, the recording medium can be prevented from approaching the recording head, but the end portion of the recording medium can move freely downward, resulting in a constant head gap. You can't expect much of the effect. Also, when an intermediate conveying roller is arranged at an intermediate spur or an intermediate position, the recording medium cannot be sufficiently conveyed due to the resistance when it plunges into it, and a part of the recording overlaps, so-called sub-scanning called sub-scanning. There was uneven recording in the (paper feed) direction. Further, the intermediate conveying roller arranged at the intermediate position is set to be higher than the peripheral speed of the supply roller in the same manner as the discharging roller so that the slack does not occur in the recording head portion. When the recording paper is conveyed and recorded, the conveyance speed is higher than when the recording paper was conveyed by the supply roller, the intermediate conveyance roller, and the discharge roller, and the conveyance amount of the recording medium per unit drive amount of the motor is increased. However, there is a problem that white stripes occur due to the gap between recordings, which is the opposite of the previous one.

The present invention has been made to solve the above-mentioned problems, and in an ink jet recording apparatus, when an intermediate roller and a spur are used, a change in the carry amount is suppressed to prevent a recording failure, and recording is performed. The purpose is to keep an appropriate distance between the head and the recording medium.

[0007]

In order to achieve the above object, an ink jet recording apparatus according to a first aspect of the invention is an upstream side of a recording medium conveying direction of a recording head which ejects ink from nozzles to record an image on a recording medium. Side supply roller, a discharge roller provided downstream of the recording head in the recording medium conveyance direction, an intermediate roller provided downstream of the recording head and upstream of the discharge roller, and the intermediate A transport force F3 for transporting the recording medium by the intermediate roller, and a transport force F1 for transporting the recording medium by the supply roller and a transport force for transporting the recording medium by the discharge roller. It is characterized by being weaker than any of F2.

In the ink jet recording apparatus having this structure,
The recording medium first reaches the supply roller, is fed by the rotation thereof, reaches the recording area below the recording head, and is further conveyed by the rotation of the supply roller while being recorded by the recording head in the downstream direction. Then, the leading end of the recording medium reaches the intermediate roller, is sandwiched between the intermediate roller and the spur, and is conveyed further downstream. At this time, since the conveyance force of the intermediate roller is weaker than that of the supply roller, the recording medium is pulled when the intermediate roller rushes into the recording medium, and a recording defect such as a blank area does not occur due to a rapid change in the feed amount. Further, the recording medium is sent in the downstream direction by the rotation of the supply roller and the intermediate roller, and the leading end of the recording medium reaches the discharge roller. When the conveyance is further continued, the end of the recording medium comes off the supply roller. On this occasion,
Since the conveyance force of the intermediate roller is weaker than that of the supply roller, the conveyance amount does not change and the recording medium does not float or bend at the moment when the end of the recording medium leaves the supply roller. Then, the recording medium is further transported in the downstream direction by being supported by the intermediate roller and the discharge roller, and finally, the recording medium is removed from the intermediate roller and sent only to the discharge roller and discharged.

According to a second aspect of the present invention, in addition to the constitution of the ink jet recording apparatus according to the first aspect, the feeding speed V3 at which the intermediate roller conveys the recording medium is such that the supply roller is the recording medium. Is faster than both the transport speed V1 for transporting the recording medium and the transport speed V2 for transporting the recording medium.

In the ink jet recording apparatus having this structure,
In addition to the operation of the inkjet recording apparatus according to claim 1, since the conveyance speed of the intermediate roller is faster than the conveyance speed of the supply roller, the recording medium is smoothly rushed into the intermediate roller, and the impact of the rush is caused. There is no change in the feed amount,
It does not cause recording failure.

According to a third aspect of the present invention, there is provided the ink jet recording apparatus according to the second aspect, wherein the conveying speed V1 is equal to the conveying speed V2.

In the ink jet recording apparatus having this structure,
In addition to the operation of the ink jet recording apparatus according to claim 2, even when the recording medium is conveyed out of the supply roller, the conveyance speed of the discharge roller and the conveyance speed of the supply roller are equal to each other, so that the rapid feed amount is increased. Does not occur, and the recording medium does not float or bend. Even if the speed changes, the end bends and immediately returns to its original position.

According to a fourth aspect of the present invention, in addition to the configuration of the ink jet recording device according to any one of the first to third aspects, the supply roller is provided on the recording head side with respect to a conveyance path of a recording medium. In addition, the spur is installed with the rotation shaft fixed, and the intermediate roller is movably installed up and down.

In the ink jet recording apparatus having this structure,
In addition to the operation of the inkjet recording apparatus according to any one of claims 1 to 3, the upper surface of the recording medium is positioned by the supply roller and the spur, and the pressing roller and the intermediate roller facing each other push up the recording medium from the lower surface. As described above, the distance between the recording head and the recording medium is kept constant. Also, even if the tip of the recording medium ejected from the discharge roller rises after the recording medium comes off the supply roller, the spur serves as a fulcrum and the intermediate roller pushes up the recording medium from the lower surface. Is urged toward the lower platen, the end of the recording medium does not float, and the recording head is not damaged or a recording defect is not caused. When the tip of the recording medium ejected from the ejection roller is pushed down, the ejection roller serves as a fulcrum and the end portion of the recording medium tries to float up, but the spur prevents the recording medium from floating. In the configuration in which the spur is pressed by the spring only when the floating of the recording medium loses the pressing force of the first spur, the terminal end part rises, but since the recording medium is sandwiched between the intermediate roller and the spur, The distance between the recording medium and the recording head is guaranteed.

According to a fifth aspect of the present invention, in addition to the constitution of the ink jet recording device according to any one of the first to fourth aspects, the spur is installed with a rotating shaft fixed, and the discharge roller is provided. Is arranged so that the point where the discharge roller and the recording medium come into contact is located on the tangent line of the spur that extends from the point where the spur comes into contact with the recording medium.

In the ink jet recording apparatus having this structure,
In addition to the action of the inkjet recording apparatus according to any one of claims 1 to 4, even with a thick recording medium, the leading end of the recording medium ejected from the discharge roller by pushing down the intermediate roller by the thickness of the recording medium. Is raised, the end of the recording medium does not float, and the recording head is not damaged or a recording defect is not caused.

An ink jet recording apparatus according to a sixth aspect of the present invention is the same as the ink jet recording apparatus according to any one of the first to fifth aspects, wherein the intermediate roller has a large diameter portion and a small diameter portion. It is characterized in that the spurs are arranged in contact with the diameter portion.

In the ink jet recording apparatus having this structure,
In addition to the operation of the inkjet recording apparatus according to any one of claims 1 to 5, since the area in contact with the recording medium can be suppressed to a small value, the conveyance force of the intermediate roller is suppressed and the conveyance by the intermediate roller causes a change in the conveyance amount. It is possible to easily control the recording medium by suppressing the influence of frictional resistance and moisture to the minimum necessary.

An ink jet recording apparatus according to a seventh aspect of the invention is characterized in that, in addition to the constitution of the ink jet recording apparatus according to any of the first to sixth aspects, the intermediate roller is made of resin.

In the ink jet recording apparatus having this structure,
In addition to the operation of the inkjet recording apparatus according to any one of claims 1 to 6, since the intermediate roller is not provided with a conveying force, when the recording medium enters the intermediate roller, the intermediate roller pulls the intermediate roller to change the feed amount, thereby recording. No defects will occur.

According to an eighth aspect of the present invention, there is provided an ink jet recording apparatus according to any one of the first to seventh aspects, further comprising a drive device for driving the supply roller, the drive device comprising: Drive is transmitted from a supply roller to the intermediate roller via the discharge roller.

In the ink jet recording apparatus having this structure,
In addition to the operation of the ink jet recording apparatus according to any one of claims 1 to 7, since the drive is not directly transmitted from the supply roller to the intermediate roller, even when the recording medium comes off the supply roller, the recording is suppressed by the discharge roller. Even when the medium runs ahead, the feeding of the leading end is suppressed, so that the trailing end bends and returns to the original state, and the normal transport state is restored.

[0023]

DETAILED DESCRIPTION OF THE INVENTION An inkjet printer 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a schematic perspective view of an inkjet printer 1 of the present embodiment, and FIG. 2 is a schematic sectional view of a main part of the inkjet printer 1 of the present embodiment. The inkjet printer 1 includes a recording head 2 that ejects ink to record on a recording medium, and a supply tray 3 that stacks the recording medium.
A supply roller 4 for conveying the recording medium picked up from the supply tray 3, a platen 5 with a rib for keeping the recording medium conveyed by the supply roller 4 flat against the recording head 2, and a recording medium after recording. The intermediate roller 6 receives and conveys the recording medium, and the discharge roller 7 that receives the recorded recording medium from the intermediate roller 6 and discharges the recording medium from the inkjet printer 1.

The recording head 2 is mounted on a carriage 9 which is slidable on a guide shaft 8 and a guide rail (not shown) held by a chassis 11, and is driven by a carriage motor 10 to perform recording while reciprocating. . Further, the recording head 2 has an ink nozzle (not shown) for ejecting ink, and records ink supplied from an ink tank (not shown) provided under the chassis 11 via the ink tube 12. Eject toward the medium for recording. The recording medium is set on the upper surface of the supply tray 3, and the chassis 1
The sheet is conveyed by the supply roller 4 housed inside 1, is recorded by the recording head 2, passes through the intermediate roller 6, and is ejected from the inkjet printer 1 by the ejection roller 7.
The supply roller 4, the intermediate roller 6, and the discharge roller 7 are driven by the paper feed motor 30.

Next, the structure of the recording medium carrying system of the ink jet printer 1 will be described with reference to FIG. As shown in FIG. 2, a supply roller 4 is provided between the supply head 3 and an upstream side of the recording head 2 in the recording medium conveyance direction. The press roller 14 held by the press roller holder 13 faces the supply roller 4, and the recording medium is sandwiched between the supply roller 4 and the press roller 14 and conveyed by the rotation of the supply roller 4. The pressing roller 14 is vertically movable and is urged upward by the spring to the supply roller 4, and is pressed down by the thickness of the recording medium. The supply roller 4 and the pressing roller 14 are configured by winding an elastic body such as rubber or resin around the shaft portion, and the conveying force is given by the nip force between them.

A platen 5 is arranged below the recording head 2, and an intermediate roller 6 is provided on the downstream side of the platen 5 in the recording medium conveying direction. The first spur 15 faces the intermediate roller 6 from above, and the recording medium from the supply roller 4 through the platen 5 reaches between the intermediate roller 6 and the first spur 15. The intermediate roller 6 is movable up and down and is urged upward by the spring where the first spur 15 is located. First spur 15
The rotation axis is fixed and cannot move up and down. Therefore, the recording medium is the intermediate roller 6 and the first spur 15
When it enters during the period, the intermediate roller 6 is pushed down by the thickness of the recording medium.

FIG. 3 is a schematic perspective view of the intermediate roller 6. The intermediate roller 6 is made of a resin such as POM or ABS, and has a large diameter portion 16 facing the first spur 15 and a small diameter portion 17 other than the large diameter portion 16. Since the intermediate roller provided in conventional inkjet printers, etc., has an elastic body such as rubber wrapped around resin to give a conveying force, the recording medium is pulled when the recording medium enters the intermediate roller, the conveying speed changes, and Although the recording amount may change due to a change in the amount, since the intermediate roller 6 of the present embodiment is made of only resin, the frictional resistance is small and the resistance at the time of entry is small. There is no effect. Further, since the recording medium is sandwiched by the large diameter portion 16 only in the portion facing the spur, the resistance is further reduced and the influence of the change in humidity is small. The first spur 15 is made of resin and has a star shape, and a plurality of first spurs 15 are provided at positions facing the large diameter portion 16 of the intermediate roller 6.

Returning to FIG. 2, a discharge roller 7 is provided further downstream of the intermediate roller 6. The second spur 18 faces the discharge roller 7 from above, and the recording medium passing through the intermediate roller 6 reaches between the discharge roller 7 and the second spur 18,
The ejection roller 7 rotates to eject the ink from the inkjet printer 1. The second spur 18 is movable up and down, and is urged downward by the spring where the discharge roller 7 is located. Like the supply roller 4, the discharge roller 7 cannot move vertically but is fixedly arranged so that it can only rotate.
Therefore, when the recording medium enters between the second spur 18 and the discharge roller 7, the second spur 18 is pushed up by the thickness of the recording medium. As described above, the intermediate roller 6 and the first spur 1
5, the first spur 15 is fixed and the intermediate roller 6 is vertically movable, and the discharge roller 7 is disposed on the tangent line of the first spur 15 extending from the point where the first spur 15 contacts the recording medium.
Since the recording medium is arranged so that the point where the recording medium and the recording medium come into contact with each other is pushed down, the rear end portion of the recording medium is pushed down, the recording medium does not easily hit the recording head 2, and damage to the head can be prevented. The distance of the recording medium is properly maintained.

Next, drive transmission of the conveying system of the ink jet printer 1 having the above-mentioned structure will be described with reference to FIGS. 4 and 5. FIG. 4 is a schematic side view of the inkjet printer 1 of the present embodiment, and FIG. 5 is a schematic side view of the side surface of FIG. 4 viewed from the back side. First, the drive from the paper feed motor 30 is transmitted to the supply roller 4 by the first belt 19 via a reduction pulley (not shown). A rotary encoder 20 is connected to the supply roller 4, and the photo sensor 20
The number of slits formed in the rotary encoder plate is counted by a, and the rotation of the supply roller 4 is controlled to start and stop. From the supply roller 4, the second belt 2
The drive is transmitted to the discharge roller 7 via the first discharge roller gear 23 connected to the discharge roller 7 and the second discharge roller gear 24 that is coaxial with the first discharge roller gear 23 via the gear 1 and the gear 22. Further, the drive is transmitted to the intermediate roller 6 from the second discharge roller gear 24 via the idle gear 25. As described above, the drive is transmitted to the three transport rollers in the order of the supply roller 4, the discharge roller 7, and the intermediate roller 6. In the present embodiment, since the intermediate roller 6 is formed only of resin and no elastic body is used, friction resistance does not occur and the recording medium may run ahead when the recording medium comes off the supply roller 4. By directly connecting the drive of the roller 4 and the discharge roller 7, there is an effect that the preceding run is suppressed.

Next, the operation of conveying the recording medium will be described. When one recording medium is supplied from the supply tray 3, the recording medium is nipped by the supply roller 4 and the pressing roller 14 and conveyed toward the platen 5. When the recording medium reaches the recording area under the recording head, the supply roller 4 is once stopped and the conveyance is stopped. Then, while the recording head 2 moves in the direction orthogonal to the recording medium conveyance direction, ink is ejected from the ink nozzles to the recording medium based on the image information, and recording is performed. When the print head 2 finishes printing for one scan,
The supply roller is driven again, the recording medium is conveyed again, the recording medium is stopped again at the next recording position, and the recording head 2 moves to perform recording. While the conveyance and the recording are repeated as described above, the leading end of the recording medium plunges between the intermediate roller 6 and the first spur 15. The intermediate roller 6 has a peripheral speed set higher than those of the supply roller 4 and the discharge roller 7, and is formed of a resin having a small frictional force, so that the load when the recording medium rushes is small,
The conveyance accuracy does not decrease due to changes in the feed amount. Further, recording and conveyance are repeated, and the leading end of the recording medium is the discharge roller 7.
And plunge between the second spur 18. Here, the supply roller 4
Since the recording medium is sandwiched by both the pressing roller 14, the intermediate roller 6 and the first spur 15, the recording medium does not bend or float and enters between the discharge roller 7 and the second spur 18 without any particular load. When recording and conveyance are further repeated, the end of the recording medium is separated from the supply roller 4 and the pressing roller 14, and the discharge roller 7 and the second spur 18 and the intermediate roller 6 and the first spur 1
The recording medium is sandwiched by 5.

Since the peripheral speed of the discharge roller 7 is set to be the same as that of the supply roller 4, even when the recording medium comes off from the supply roller 4, the recording medium does not rush and does not run ahead.
When the leading end of the recording medium ejected from the discharge roller 7 floats up, the second spur 18 tries to float up against the pressing force, but the first spur 15 serves as a fulcrum and the end portion of the recording medium is a platen. Since the rib surface arranged on the recording medium 5 is biased, the distance between the recording medium and the recording head 2 is guaranteed. Further, depending on the state of the recording medium, the discharge roller 7 serves as a fulcrum, and the intermediate roller 6 sinks the recording medium.
The recording medium may float at the end portion, but here again, the pressing of the intermediate roller 6 urges the recording medium to the first spur 15 so that the float at the leading end of the recording medium is not transmitted to the end portion. It is possible.

When the tip of the recording medium discharged from the discharge roller 7 is pushed down, the discharge roller 7
Becomes a fulcrum and the end of the recording medium tries to rise,
The first spur 15 restricts the lifting of the recording medium. Further, in the structure in which the spring is pressed only by the first spur 15, when the floating of the recording medium is lost by the pressing force of the first spur 15, the end portion is lifted up. Since the recording medium is sandwiched, the distance between the recording medium and the recording head 2 is guaranteed.

As described above, according to the ink jet printer 1 of this embodiment, the intermediate roller 6 having no conveying force is provided between the supply roller 4 and the discharge roller 7 as the first spur 15.
Since the conveyance speeds of the supply roller 4 and the discharge roller 7 are set to be equal to each other, even when the leading end of the recording medium enters the intermediate roller 6, the impact is small, and the trailing end of the recording medium comes off the supply roller 4. Even in this case, the discharge roller 7 side is not pulled and the vehicle does not run ahead. Therefore, it is possible to prevent recording defects such as white spots and banding due to a change in the feed amount.
Further, since the first spur 15 and the intermediate roller 6 and the second spur 18 and the discharge roller 7 are arranged so that the recording medium is conveyed tangentially, the vertically moving intermediate roller 6 and the second spur 18 cause the recording medium to move. The position of the recording medium is adjusted by the thickness, and the lifting of the end of the recording medium can be suppressed, and the distance between the recording head 2 and the recording medium can be appropriately maintained.

[0034]

As is apparent from the above description, claim 1
According to the inkjet recording apparatus described in (1), since the conveyance force of the intermediate roller is weaker than that of the supply roller, the recording medium is pulled when the intermediate roller rushes in, and a recording defect such as white spot occurs due to a rapid change in the feed amount. There is no such thing. In addition, the conveyance amount does not change at the moment when the end of the recording medium leaves the supply roller, and the recording medium does not float or bend.

According to the ink jet recording apparatus of the second aspect, in addition to the effect of the ink jet recording apparatus of the first aspect, the conveyance speed of the intermediate roller is faster than the conveyance speed of the supply roller, and therefore the recording medium. Entry into the intermediate roller is performed smoothly, the feed amount does not change due to the impact of the entry, and recording defects do not occur.

According to the ink jet recording apparatus of the third aspect, in addition to the effect of the ink jet recording apparatus of the second aspect, even if the recording medium comes out of the supply roller and is conveyed, Since the transport speed and the transport speed of the supply roller are equal, there is no sudden change in the feed amount,
The recording medium does not float or bend. Even if the speed changes, the terminal end can bend and return to the original position immediately.

According to the ink jet recording apparatus of the fourth aspect, in addition to the effects of the ink jet recording apparatus according to any one of the first to third aspects, the upper surface of the recording medium is positioned by the supply roller and the spur, respectively. The pressing roller and the intermediate roller, which face each other, push up the recording medium from the lower surface, so that the distance between the recording head and the recording medium is kept constant. Also, even if the tip of the recording medium ejected from the discharge roller rises after the recording medium comes off the supply roller, the spur serves as a fulcrum and the intermediate roller pushes up the recording medium from the lower surface. Is urged toward the lower platen, the end of the recording medium does not float, and the recording head is not damaged or a recording defect is not caused. Further, when the leading end of the recording medium ejected from the ejecting roller is pushed down, the ejecting roller serves as a fulcrum and the end portion of the recording medium tries to float up, but the spur spoils the floating up of the recording medium. Since the recording medium is sandwiched between the intermediate roller and the spur, the distance between the recording medium and the recording head is guaranteed.

According to the ink jet recording apparatus of the fifth aspect, in addition to the effects of the ink jet recording apparatus according to any one of the first to fourth aspects, even if the recording medium is thick, the thickness of the recording medium is equal to that of the recording medium. The intermediate roller is pushed down,
Since the tip of the recording medium ejected from the ejection roller rises upward, the end of the recording medium does not float, and the recording head is not damaged or a recording defect is not caused.

According to the ink jet recording apparatus of the sixth aspect, in addition to the effect of the ink jet recording apparatus according to any one of the first to fifth aspects, the area in contact with the recording medium can be suppressed to be small, and therefore the intermediate roller The conveyance force can be suppressed so that the conveyance by the intermediate roller does not change the conveyance amount, and the influence of frictional resistance and moisture can be suppressed to the necessary minimum to facilitate the control of the recording medium.

According to the ink jet recording apparatus of the seventh aspect, in addition to the effects of the ink jet recording apparatus according to any one of the first to sixth aspects, since the intermediate roller is not provided with a conveying force, the intermediate of the recording medium is obtained. When the roller rushes in, it is pulled by the intermediate roller and the feed amount changes, thus preventing recording defects.

According to the ink jet recording apparatus of the eighth aspect, in addition to the effect of the ink jet recording apparatus according to any one of the first to seventh aspects, since the drive is not directly transmitted from the supply roller to the intermediate roller, the recording medium Even if the paper comes off the supply roller, it is held down by the discharge roller and the feed of the leading edge is suppressed even when the recording medium runs ahead.
The terminal end bends and returns to the original state, and the normal transport state can be restored.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an inkjet printer according to an embodiment.

FIG. 2 is a schematic cross-sectional view of a main part of the inkjet printer of the present embodiment.

FIG. 3 is a schematic perspective view of an intermediate roller.

FIG. 4 is a schematic side view of the inkjet printer of the present embodiment.

5 is a schematic side view when the side surface of FIG. 4 is viewed from the back side.

[Explanation of symbols]

1 inkjet printer 2 recording head 3 supply trays 4 supply rollers 5 Platen 6 Intermediate roller 7 discharge roller 8 Guide shaft 9 carriage 10 Carriage motor 11 chassis 12 ink tubes 13 Presser roller holder 14 Presser roller 15 First spur 16 Large diameter part 17 Small diameter part 18 Second spur 19 First Belt 20 rotary encoder 20a photo sensor 21 Second Belt 22 gears 23 First discharge roller gear 24 Second discharge roller gear 25 idle gear 30 Paper feed motor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B41J 2/01 B41J 13/02 13/02 3/04 101Z

Claims (8)

[Claims] 1. A supply roller provided on the upstream side of a recording head in the recording medium conveying direction for ejecting ink from a nozzle to record an image on a recording medium; and a supply roller provided on the downstream side of the recording head in the recording medium conveying direction. A discharge roller, an intermediate roller provided on the downstream side of the recording head and on the upstream side of the discharge roller, and a spur facing the intermediate roller. The intermediate roller conveys a recording medium F3.
Is a conveying force F with which the supply roller conveys the recording medium.
1. An ink jet recording apparatus, wherein 1 and the discharge roller are weaker than any one of a conveying force F2 for conveying the recording medium. 2. The transport speed V3 at which the intermediate roller transports the recording medium is greater than either the transport speed V1 at which the supply roller transports the recording medium or the transport speed V2 at which the discharge roller transports the recording medium. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is also fast. 3. The ink jet recording apparatus according to claim 2, wherein the transport speed V1 and the transport speed V2 are equal to each other. 4. The supply roller is on the side of the recording head with respect to a conveyance path of a recording medium, the spur is installed with a rotation shaft fixed, and the intermediate roller is installed movably up and down. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is an inkjet recording apparatus. 5. The spur is installed with a fixed rotating shaft,
Further, the discharge roller is arranged such that a point where the discharge roller and the recording medium come into contact is located on a tangent line of the spur that extends from a point where the spur comes into contact with the recording medium. The inkjet recording apparatus according to any one of claims 1 to 4. 6. The intermediate roller according to claim 1, wherein the intermediate roller has a large diameter portion and a small diameter portion, and is arranged so that the spur comes into contact with the large diameter portion. Inkjet recording device. 7. The ink jet recording apparatus according to claim 1, wherein the intermediate roller is made of resin. 8. A drive device for driving the supply roller, the drive device transmitting drive from the supply roller to the intermediate roller via the discharge roller. The ink jet recording apparatus according to any one of claims.