JP2002362804A - Curl correction device and recording device equipped with the curl correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid unnecessary bend on a paper roll travelling from a curl correction roller provided upstream of an ink jet recording head for correcting a curl of the paper roll to the ink jet recording head so as to maintain suitable curl correction effects, thereby obtaining an even recording quality. SOLUTION: The curl correction device for correcting the curl of the paper roll PR comprises the curl correction roller 28 for turning the paper roll PR against the curled direction, and a restriction roller 27 for restricting the turned length of the paper roll PR on the curl correction roller 28. The curl correction roller 28 is disposed on a substantial extension of a tangent line at a nip point between a conveyance drive roller 20 and a conveyance drive roller 21 for conveying the paper roll PR to the ink jet recording head and the disposition may change on the substantial extension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curl correcting device for correcting the curl of a roll paper used in a recording device such as a facsimile or a printer. Further, the present invention relates to a recording device provided with the curl correction device.

[0002]

2. Description of the Related Art Some recording apparatuses such as a facsimile and a printer can use a roll paper capable of continuously recording over a long length as a recording medium (print medium). Because the roll paper is wound in a roll,
There is a problem that the curl habit remains even after being fed from the roll body. If such a curl remains, for example, it becomes difficult for the user to handle the rolled paper that has been recorded and discharged, and it is also difficult to handle the roll paper during storage.

Further, in a case where a cutter unit for cutting roll paper into a predetermined size is provided in the paper discharge unit, the roll paper cut into a cut sheet is curled on the paper discharge tray. Therefore, there is also a problem that the roll paper discharged one after another interferes with the curled roll paper on the discharge tray, so that a regular stacking cannot be performed.

In addition, there arises a problem that the leading end of the discharged roll paper rubs against the recording surface of the roll paper already discharged to the discharge tray, thereby damaging the recording surface. In addition, in the case of an ink jet printer, the gap between the ink jet recording head that ejects ink droplets and the recording surface of the roll paper becomes non-uniform due to the curl of the roll paper, which may lower the recording quality. Therefore,
In order to solve the above problems, some recording apparatuses that use roll paper include a curl correction device that corrects the curl of the roll paper.

FIG. 10 shows an example of such a curl correcting device according to the prior art. The curl correcting device (curl removing mechanism) is disclosed in Japanese Patent Application Laid-Open No. 9-25036. 10, reference numeral 500 denotes a roll paper main body, reference numeral 501 denotes a correction roller (correction member) for correcting curl, and reference numerals 503 and 504 denote a transport roller and a pinch roller provided downstream from the correction roller. . Reference numeral 505 denotes an inkjet recording head that performs printing on the roll paper 500a.

In FIG. 10, the correction roller 501 is supported by a support arm 506. The support arm 506 is provided so as to be rotatable about a rotation shaft 507 (for example, the direction A in the drawing), and the support arm 506 is rotated about the rotation shaft 507, so that the disposition position of the correction roller 501 is provided. Is displaced. Therefore, by displacing the arrangement position of the straightening roller 501, an appropriate curl correcting effect according to the degree of curl of the roll paper 500a can be obtained.

[0007]

By the way, as described above, in the ink jet printer, the gap between the ink jet recording head for ejecting ink droplets and the recording surface of the roll paper becomes non-uniform due to the curl of the roll paper, and the recording quality becomes poor. Therefore, in this case, the curl correcting device for correcting the curl is provided on the upstream side of the ink jet recording head as in the related art shown in FIG. However, if another roller that winds the roll paper in any direction exists between the straightening roller that corrects the curl and the inkjet recording head, there is a problem that the curl habit occurs again in the roll paper due to the roller. appear. In FIG. 10, the roll paper 500 whose curl has been corrected by the correction roller 501 is shown.
a is wound around the pinch roller 504 by a fixed amount, whereby the curl of the roll paper 500a may occur again.

Further, since the disposition position of the correction roller 501 is displaced, the amount of winding of the roll paper 500a around the pinch roller 504, that is, the strength of the curl generated again by the pinch roller 504 changes accordingly. ,
Since the distance between the inkjet recording head 505 and the roll paper 500a changes, there is also a problem that uniform print quality cannot be obtained.

Accordingly, the present invention has been made in view of such a problem, and an object of the present invention is to move from a curl correcting roller provided on the upstream side of an ink jet recording head to correct curl of roll paper to an ink jet recording head. An object of the present invention is to maintain a proper curl correction effect without giving unnecessary curl to roll paper, and to obtain a uniform recording quality.

[0010]

According to a first aspect of the present invention, there is provided a curl correcting apparatus for fixing a curl on an ink jet recording head for recording on roll paper and a roll paper under the ink jet recording head. A transport drive roller that is transported at a pitch and is driven to rotate, and a transport driven roller that nips the roll paper between the transport drive roller and a transport driven roller that is pressed against the transport drive roller and is driven to rotate. In the recording apparatus, a curl correcting device provided on an upstream side of the transport driving roller and the transport driven roller, for correcting a curl of the roll paper, having a rotation axis orthogonal to a traveling direction of the roll paper. A rotatable curl correction roller that winds the roll paper in a direction opposite to the curl habit direction; and a rotation shaft that is orthogonal to a traveling direction of the roll paper. A rotatable regulating roller that is disposed near the upstream side of the curl correction roller and regulates the length of the roll paper wound around the curl correction roller, and that rotates the roll paper in the curl habit direction; A curl straightening roller position adjusting means for adjusting a winding length of the roll paper around the curl straightening roller by displacing an arrangement position of the curl straightening roller; and A roller path adjusting means is provided near an extension of a tangent line at a nip point between the transport driving roller and the transport driven roller when the traveling path of the roll paper is viewed from the side. The arrangement position of the curl correction roller is displaced so as to keep a constant angle of advance to a nip point between a conveyance driving roller and the conveyance driven roller.

According to the first aspect of the present invention, unnecessary curl is not given to the roll paper toward the ink jet recording head from the curl correction roller for correcting the curl of the roll paper. Similarly, even if the position of the curl correction roller is displaced in order to change the curl, the roll paper does not bend unnecessarily, so that the proper curl correction effect is maintained and uniform recording quality is maintained. It is possible to obtain.

That is, the curl correcting roller for correcting the curl of the roll paper is provided in the vicinity of an extension of a tangent line at the nip point between the transport driving roller and the transport driven roller when the traveling path of the roll paper is viewed from the side. Therefore, after the roll paper has left the curl correction roller, it proceeds straight to the nip point with the transport driving roller or the transport driven roller, whereby the roll paper is not wound around either of the two rollers, and thus the curl correction is performed. The rolled paper is conveyed under the ink jet recording head in an appropriate state without curling the rolled paper after the curl and giving the curl again.

Next, a roller position adjusting means for adjusting the length of the roll paper wound around the curl correcting roller by adjusting the position of the curl correcting roller is provided. The position at which the curl correcting roller is disposed is displaced so as to maintain a constant angle of advance to the nip point between the roller and the transport driven roller. Therefore, even if the disposition position of the curl correcting roller is displaced, the roll paper is hardly wound around the transport driving roller or the transport driven roller, whereby it is possible to maintain an appropriate curl correcting effect,
Thus, it is possible to obtain a uniform recording quality.

According to a second aspect of the present invention, in the curl correcting device according to the first aspect, the roller position adjusting means can slide the rotation axis of the curl correction roller in a direction orthogonal to the rotation axis of the curl correction roller. And a slide stopper means for fixing the rotation axis of the curl correction roller at a predetermined slide position. According to the invention described in claim 2 of the present application, the roller position adjusting means slides the rotation axis of the curl correction roller in a direction orthogonal to the rotation axis of the curl correction roller; Since the rotating shaft is constituted by the slide stopper means for fixing the rotating shaft at a predetermined sliding position, the roller position adjusting means can be configured at a low cost with a simple structure.

According to a third aspect of the present invention, in the curl correcting device according to the first or second aspect, the roller position adjusting means includes:
The curl correction roller is configured to be displaced in a stepwise manner to an arrangement position optimized according to the type of roll paper expected to be used in advance.

According to the third aspect of the present invention, the user can easily set an appropriate curl correction degree according to the type of roll paper. That is, the roller position adjusting means does not displace the disposition position of the curl correcting roller to an arbitrary position, but displaces only the disposition position optimized according to the type of roll paper to be used. . For example,
If the roll paper to be used is of two types, a thick glossy paper having a strong stiffness and a plain paper having a weak stiffness, the curl correcting roller or the regulating roller uses the curl habit of these two types of roll paper. Is provided so as to be displaced only to a position that is optimal for correcting the error. Here, the “arranged position optimized according to the paper type” means that the degree of curl of the roll paper differs depending on the paper type (paper thickness, material) of the roll paper.
This refers to the position of the curl correcting roller or the regulating roller when the length of the roll paper wound around the curl correcting roller is adjusted so that the degree of curl correction is optimal according to the degree of curl of each paper type. . Therefore, as described above, the user can easily adjust (switch) the degree of curl correction according to the type of roll paper used.

According to a fourth aspect of the present invention, in the recording apparatus, a roll paper holder rotatably supporting the roll paper, an ink jet recording head for recording on the roll paper, and the roll paper fixed below the ink jet recording head. A transport drive roller that is transported at a pitch and is driven to rotate, and a transport driven roller that nips the roll paper between the transport drive roller and a transport driven roller that is pressed against the transport drive roller and is driven to rotate. A recording device, comprising: the curl correcting device according to any one of claims 1 to 3.
According to the invention described in claim 4 of the present application, in the recording device,
Since the curl correcting device according to any one of claims 1 to 3 of the present application is provided, the same operation and effect as the above-described invention according to any one of claims 1 to 3 of the present application can be obtained. .

According to a fifth aspect of the present invention, there is provided an ink jet recording head for performing recording on a recording medium by discharging ink droplets, and a rotary drive for conveying the recording medium at a constant pitch under the ink jet recording head. A transport drive roller, a transport driven roller that nips a recording medium between the transport drive roller, a transport driven roller that is pressed against the transport drive roller and is driven to rotate, and a recording medium that is set in an inclined posture at the rear of the apparatus. A feeding path inclined toward the conveyance driving roller and the conveyance driven roller, and a substantially horizontal feeding path toward which the recording medium inserted substantially horizontally from the rear of the apparatus is directed toward the conveyance driving roller and the conveyance driven roller. A recording apparatus, comprising a roll paper holder rotatably supporting roll paper at the rear of the apparatus, and wherein the roll paper passes through the substantially horizontal feeding path. And use is configured so as toward the transporting drive roller and the follower roller, claims 1 to 3
The curl correction device according to any one of the above, is disposed in the acute angle side area of a substantially triangular side view formed by joining the inclined feeding path to the substantially horizontal feeding path. It is characterized by the following.

According to the fifth aspect of the present invention, the feed path of the roll paper is fed using the substantially horizontal feed path for the recording medium inserted horizontally from the rear of the apparatus, so that the roll paper is fed. The configuration is simplified, and the curl correction device according to any one of claims 1 to 3 has a substantially triangular side-view triangular shape formed by joining an inclined feed path to a substantially horizontal feed path. Since it is located in the acute angle area,
In addition to the effects of the invention described in any one of claims 1 to 3 of the present application, the curl correction device can be provided without increasing the size of the recording device by using the acute angle side area. Becomes possible.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the general structure of an ink jet printer (hereinafter, referred to as "printer") 200 as a "recording apparatus" according to the present invention will be described with reference to FIGS. Here, FIG.
FIG. 2 is a schematic side sectional view of the printer 200.

As shown in FIG. 1, the printer 200 includes a paper feeder 100 according to the present invention at the rear of the printer main body 5 and extends in front of the printer main body 5 by being pulled out in multiple stages toward the near side. A paper output stacker 6 is provided. The sheet feeding device 100 can set both a plurality of cut sheets P _T (not shown in FIG. 1) cut into a predetermined size and a roll paper roll R wound in a roll shape. The _PT and the roll paper P _R (not shown in FIG. 1) fed from the roll paper roll R are fed from the paper feeding device 100 to the inside of the printer main body 5 and are sent to the inkjet recording head 22 (shown in FIG. 1). And is discharged to the discharge stacker 6.

In FIG. 1, reference numeral 1 denotes a roll paper holder that rotatably supports the roll paper roll R. Further, reference numeral 2 and code 3 is shows an edge guide for guiding the side end of the cut paper P _T, reference numeral 4, a hopper (described later) as a "sheet supporting member" for supporting the back of the single-cut sheet Is shown. The edge guide 3 is slidably mounted on the hopper 4 in accordance with the width of the cut sheet.

Next, the configuration of the sheet feeding device 100 will be described in detail with reference to FIG. As described above, the paper feeding device 100 includes the roll paper holder 1 that rotatably supports the roll paper roll R behind the apparatus (to the right in FIG. 2). The roll paper holder 1 includes a support shaft (not shown) through which the shaft of the roll paper roll R is inserted, a support member 8 that supports the support shaft at both ends, and the support shaft attached to both ends of the support shaft. Rotation knob 7 for manually rotating the support shaft when necessary
and b, a cover member 7a for covering both side edges of the roll paper roll R, and the roll paper roll R is rotated by the paper feed force of the feeding drive roller 20 to be described later, as the roll paper P _R is fed out Has become. The support member 8 is formed with a hook 8a. The hook 8a is hooked on a hook 26b formed on an upper portion of a second frame 26 of the curl correction device 50 described later. The roll paper holder 1 is thereby stopped by the curl straightening device 50 (the paper feeding device 10).
0).

Further, the paper feeding device 100 comprises a base of the device.
A plurality of cut sheets P on the main frame 9 to be formed_TThe inclined figure
A hopper 4 for supporting the power is provided. Hopper 4 is a plate
And in an inclined posture as shown in FIG.
Is provided so as to be rotatable around the center. In addition, the hopper 4
A hopper spring 11 is provided on the lower rear surface, and the hopper
4 at the feed roller 15 which is substantially D-shaped when viewed from the side.
Energize towards. Further, the hopper 4 is a cam (not shown).
The feed mechanism is driven by the biasing force of the hopper spring 11 by the mechanism.
Against the pressure of the hopper spring 11 and the urging force of the hopper spring 11.
The lower part is separated from the paper feed roller 15
Can be switched to the cut sheet P _TWhen feeding paper
Cut paper P deposited on the hopper 4 in the pressed state.
_TIs pressed against the paper feed roller 15 and
From the cut sheet P_TAre fed out one by one
You.

Reference numeral 12 denotes a separation pad holder provided below the hopper 4 so as to be rotatable around a rotation shaft 12a. Reference numeral 13 denotes a pad spring for urging the separation pad holder 12 to rotate. reference numeral 14 is shows a separation pad provided in a portion facing the paper feed roller 15 of the separation pad holder 12 (friction member), during the feeding operation of the cut paper P _T, the separating pad 14 and the paper feed roller by the state of 15 and nips the cut-sheet paper P _T of the uppermost being fed, when the single-cut sheet P _T of the uppermost is fed, double feeding of the next or subsequent sheet is prevented .

Next, on the downstream side of the paper feed roller 15, a paper detector for detecting the passage of the cut paper P _T or rolled paper P _{R (hereinafter} referred to appropriately collectively referred to "paper P") ( A sensor unit 16 (not shown) is provided. Sensor section 16
Has a substantially U-shape when viewed from the side, is provided rotatably about a rotation shaft 16a, and rotates clockwise as shown in FIG. When the edge passes, it rotates counterclockwise, thereby detecting the passage of the sheet P and the detection of the sheet size.

Note that a front paper guide 19 is provided below the sensor unit 16, and is provided from the hopper 4 to the paper feed roller 15.
The leading end of the cut-sheet paper _PT fed out at an acute angle into the front paper guide member 19, whereby the cut-sheet paper P
_T is guided downstream. Also, the rear of the front paper guide 19 (right side in FIG. 2) have been connected the rear paper guide 18, rear section sheet guide 18, the roll paper P _R plugged from decurler 50 to be described later tip In addition to functioning as a guide member for guiding the paper to the downstream side, a thick print medium (not shown) is inserted horizontally from the rear of the paper feeder 100 (in the direction indicated by arrow B in FIG. 2). To guide.

Therefore, the paper feeder 100 has three paper paths,
That is, a cut sheet _PT set in an inclined posture and a roll sheet P fed from a roll sheet roll R supported at the rear.
_It has three paper paths for feeding _R and a thick print medium that is inserted horizontally from the lower rear of the paper feeding device 100, and can handle a wide variety of print media.

Further, as is apparent from FIG.
0 indicates that a plurality of cut sheets _PT and a roll paper roll R can be set at the same time. Even when the print medium to be used is switched, compared to a configuration in which only one of the print media can be set. Thus, the switching operation is easy and the convenience of the user is improved.

Next, a recording section and a paper discharge section of the printer 200 are provided downstream of the sensor section 16. The recording unit includes a transport drive roller 20 that transports the paper P at a constant pitch, a transport driven roller 21 that presses against the transport drive roller 20, an inkjet print head 22 that ejects ink droplets, and a gap between the inkjet print head 22 and the paper P. , And a paper discharge unit is provided with a sheet P on which recording is performed by the inkjet recording head 22.
Is driven by a discharge drive roller 25 that is driven to rotate, a paper discharge driven roller 24 that is freely rotatable and presses against the paper discharge drive roller 25, and the above-described discharge stacker 6 (see FIG. 1). It is configured. The general configuration of the printer 200 has been described above.

Next, with reference to FIGS. 2 and 3 to describe the configuration of the curl straightening device 50 for correcting the curl of the following roll paper P _R. Here, FIG. 3 is a perspective view of the curl removing device 50 (a perspective view of the printer 200 as viewed obliquely from behind). As described above, the roll paper roll R is the cut sheet P
Since supported on the rear side of the hopper 4 for supporting the _T, the roll paper P _R fed out through the bottom of the hopper 4 from the rear side of the hopper 4, a cut sheet in the lower part of the paper feed roller 15 shown in FIG. 2 Merges with the inclined feed path of the paper _PT ,
Then, it is directed to the transport drive roller 20.

Here, the curl correcting device 50 is provided in a space on the back side of the hopper 4 provided in an inclined posture.
More specifically, the curl correction device 50 is roughly composed of a curl correction roller 28 described below and a regulating roller 27,
These are provided in a space serving as a dead space formed on the back side of the hopper 4 provided in an inclined posture.
In other words, the curl straightening device 50, a feed path which is inclined to feed the cut paper P _T, the thick to be inserted from the rear lower portion of the sheet feeding apparatus 100 in the horizontal direction as indicated by arrow B in FIG. 2 It is provided in a dead space formed in an area on the acute angle side of a triangle formed by a substantially horizontal supply path of the print medium. Therefore, this allows the paper feeder 100
The curl correction device 50 is provided without increasing the size of the (printer 200).

Next, the configuration of the curl correction device 50 will be described in detail. In the curl straightening device 50, the roll paper _{P R}
The correcting curl of the roll paper P _R by winding, the curl straightening roller 28 as a main component of the curl straightening device 50, the axis in the first frame 17 to which the rotation shaft 28a is the substrate of the device It is disposed in the device by being supported. Since the roll paper P _R paid out from the roll paper roll R has arisen curl, therefore, the curl straightening roller 28, wound roll paper P _R in the opposite direction to the curl habit, thereby, curl of the roll paper P _R is corrected. In the present embodiment, the curl straightening rollers 28 has been plurality disposed at a predetermined distance over the width direction of the roll paper P _R to the rotational shaft 28a as shown in FIG. 3, the roll as it will be densely arranged across all the width direction of the paper P _R, or may be a long one roller in the width direction of the roll paper P _R. Further, the rotation shaft 28a is provided on the first frame 17 so that its disposition position can be displaced.
, Which will be described later.

The upstream side of the curl correction roller 28 is
A roller 27 is provided. The regulating roller 27 corrects curl
It is provided upstream of the roller 28 and, as shown in FIG.
Roll paper P by the straightening roller 28_RDetour path
Form. Therefore, the regulating roller 27 is provided with the roll paper P_Rof
Role for regulating the length of winding on the curl correction roller 28,
In addition, played a role in determining the degree (strength) of curl correction
You. The regulating roller 27 is the same as the curl correcting roller 28.
As shown in FIG. 3, the roll paper P _RWidth
Multiple units are arranged at predetermined intervals in the direction
But roll paper P_RDensely arranged in the entire width direction
Or roll paper P_ROne row that is long in the width direction
It may be la.

The rotation shaft 27 a of the regulating roller 27 is supported by the second frame 26. The second frame 26 is attached to the first frame 17 via a rotation shaft 26a, and can rotate clockwise / counterclockwise as shown in FIG. 2 around the rotation shaft 26a. I have. Hereinafter, the attachment structure of the second frame 26 to the first frame 17 will be described in detail with reference to FIGS. here,
4 to 6 are side views (enlarged views) of the curl correction device 50. FIG.

In FIG. 4, a lock lever 30 is attached to the second frame 26 so as to be rotatable clockwise and counterclockwise in FIG. 4 about a rotation shaft 30a. The lock lever 30 has a recess 30b formed therein.
However, the second frame 26 is fixed to the first frame 17 by locking the recess 30b to the lock pin 32 provided on the lock pin 32 provided on the first frame 17. It has become. FIG. 4 shows the fixed state (the state in which the second frame 26 is locked to the first frame 17). In this state, the lock lever 30 is moved to the concave portion 3 by urging means (not shown).
Ob is urged to rotate in a direction (counterclockwise in FIG. 4) in which it is engaged with the lock pin 32.

In order to rotate the second frame 26 clockwise in FIG. 4 from the state of FIG. 4 (to release the locked state of the second frame 26), the lock lever 30 is biased as shown in FIG. Pivoted clockwise against the
And the lock pin 32 is released from the engagement state. Recess 30b
When the engagement state between the lock paper 32 and the lock pin 32 is released, the weight of the roll paper holder 1 and the roll paper roll R causes the second frame 26 to rotate clockwise (the state of FIG. 6). Then, as shown in FIG. 6, the paper path of the roll paper P _R between the curl correcting roller 28 and the regulating roller 27 is opened, exposed portion 31 is formed. FIG. 3 shows a state in which the second frame 26 is rotated to form the exposed portion 31. Therefore, by inserting the tip of the roll paper P _R from the exposed portion 31 in the state, it is possible to easily set the roll paper P _R to the paper path of the roll paper P _R.

[0038] Incidentally, setting the roll paper P _R to the paper path of the roll paper P _R, the paper detector as described above to detect the passage of the tip portion of the roll paper P _R, the control unit of the printer 200 (not shown) is automatically transport driving roller 20 (see FIG. 2) is driven rotated, turned as a predetermined amount feed after nipping the roll paper P _R.

Next, a roller position adjusting means for displacing the position of the curl removing roller 28 will be described with reference to FIGS. Here, FIG. 7 is a side view (enlarged view) of the curl removing device 50, and FIG.
It is a schematic view of a paper path of the roll paper P _R leading to the transport driving roller 20.

In FIG. 7, a slide groove 34 is formed in the first frame 17 so that both shaft ends of the rotation shaft 28a of the curl removing roller 28 can slide in the left-right direction of FIG.
A U-shaped groove 33 as “slide stopper means” into which both shaft ends of the rotating shaft 28 a are indented along the slide groove 34.
a, 33b and 33c are formed. Accordingly, both shaft ends of the rotating shaft 28a are recessed into any of the U-shaped grooves 33a, 33b, 33c, and the fixing member 35 is moved into the recessed U.
The two ends of the rotating shaft 28a are fixed to the U-shaped groove so as not to come off. Thus, the curl removing roller 28
Can be displaced to three positions, a position shown in FIG. 7, a position shown by reference numeral 28 ', and a position shown by reference numeral 28 ".

[0041] Here, the three positions decurling roller 28 is displaced, the type of the roll paper to be used as a roll paper P _R, in the present embodiment, glossy paper A,
The positions are optimized corresponding to the three types B and C (not shown). More specifically, the paper type (paper thickness, paper quality) of the roll paper to be used in the printer 200 is determined in advance, and in this embodiment, the glossy papers A, B, and C are used.
The three types are the same, and the paper quality is the same, and the paper thickness has a relationship of A>B> C. Accordingly, the curl habits are also in the order of A>B> C in the same order. Roller position adjusting means for adjusting the intensity of the order of curl correction by displacing the arrangement position of the decurling roller 28, the curl correction by increasing the winding length of the roll P _R to decurling roller 28 Therefore, the position where both shaft ends of the rotating shaft 28a enter the U-shaped groove 33a is the position of the glossy paper A, and the position where the both ends of the rotating shaft 28a are inserted into the U-shaped groove 33b is the position of the glossy paper B.
The position in which the U-shaped groove 33c is recessed is the optimum position for curling the glossy paper C.

Further, the arrangement position of the curl correction roller 28,
That is, the formation positions of the U-shaped grooves 33a to 33c are also determined by the relationship between the transport driving roller 20 and the transport driven roller 21 shown in FIG. In FIG. 7, the curl correcting roller 28 includes a transport driving roller 20 and a transport driven roller 2.
It provided one upstream and the other roller is not provided between these rollers, as illustrated, from the roll paper P _R is the curl correcting roller 28 to draw a straight paper path for the transport driving roller 20 It is going to head.

Here, the curl correction roller 28 is provided near an extension of a tangent line at a nip point between the transport driving roller 20 and the transport driven roller 21. This allows
Roll paper P _R away the curl straightening roller 28 proceeds straight to the nip point between the transport driving roller 20 and the transport driven roller 21, thus without being wound than necessary transport driving roller 20 or the transport driven roller 21, thus again curl the roll paper P _R is prevent a problem that is imparted by the transport driving roller 20 or the transport driven roller 21.

The ink jet recording head 22 (FIG. 2)
See) and to maintain a distance between the roll paper P _R uniformly, may be as pressing slightly the roll paper P _R to the platen 23 located downstream of the transport driving roller 20 (see FIG. 2), the In such a case, the rotation center of the conveyance driven roller 21 is slightly downstream of the rotation center of the conveyance driving roller 20 (see FIG. 2).
To the left of), but in these cases,
Although very slight, the transport drive roller 20 and the roll paper P
A contact length with _R may occur.

[0045] Returning to FIGS. 7 and 8, in order to adjust the degree of curl correction depending on the paper type of the roll paper P _R, it is displaced the arrangement position of the curl straightening roller 28, as shown in FIG. 8 The U-shaped grooves 33a to 33c shown in FIG. 7 are formed so as to keep the traveling angle of the roll paper PR from the curl correction roller 28 to the transport driving roller 20 constant without changing the angle. Thus Accordingly, there is no roll paper P _R is wound around the arrangement position transport driving roller 20 or the transport be displaced the driven roller 21 of the curl straightening roller 28,
Than Te again curl the roll paper P _R This also is prevented problems that are granted.

The roller position adjusting means for displacing the position of the curl correcting roller 28 shown in FIG. 7 is merely an example, and any structure can be used if the position of the curl correcting roller 28 can be displaced. May be anything. Also,
The arrangement position of the curl straightening roller 28 as in this embodiment rather than stepwise like to adjust configurations depending on the paper type of the roll paper P _R, fixably continuously displaceably and any position You may comprise.

Further, the degree of curl correction can be adjusted by changing the position of the regulating roller 27. FIG. 9 is a side view of the curl removing device 50 '(second embodiment of the curl correcting device) including the roller position adjusting means for displacing the arrangement position of the regulating roller 27. In FIG. 9, an arc-shaped guide groove 81 is formed in a first frame 86, and an arc-shaped guide groove 81 is formed in a second frame 80.
A fixing screw 82 that displaces inside the guide groove 81 according to the rotation of the second frame 80 is attached.

Accordingly, by loosening the fixing screw 82, the second frame 80 can be turned around the turning shaft 80a, and by tightening the fixing screw 82, the second frame 8 can be turned.
0 can be fixed to an arbitrary position, for example, a position indicated by reference numeral 80 ′, or a position indicated by reference numeral 80 ″. Such rotation of the second frame 80 restricts the rotation. roller 27 becomes displaceable to the position indicated by the position or reference numeral 27 'shown at 27', thus being adjusted winding length of the roll P _R to the curl straightening roller 28, the curl straightening degree of the roll paper P _R Can be adjusted.

Also, without rotating the second frame 80, a slide groove and a plurality of U-shaped grooves as shown in FIG. 7 are formed in the second frame 80, and the rotation shaft 27a of the regulating roller 27 is moved. The arrangement position of the regulating roller 27 can also be displaced by adopting the configuration of sliding. In this case, it goes without saying that there may be various other configurations in which the arrangement position of the regulating roller 27 is displaced. Furthermore, the winding length of the roll paper P _R to the curl straightening roller 28 or regulating attaching the rotation shaft 27a of the roller 27 detachably to the second frame 80, the curl straightening roller 28 also by exchanging different roller diameters That is, the degree of curl correction can be adjusted.

[0050]

As described above, according to the present invention, the curl correction roller for correcting the curl of the roll paper does not give excessive curl to the roll paper toward the ink jet recording head. Similarly, when the disposition position of the curl correction roller is displaced for changing, the roll paper does not bend unnecessarily, thereby maintaining a proper curl correction effect and obtaining uniform recording quality. It becomes possible.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an ink jet printer according to the present invention.

FIG. 2 is a schematic side sectional view of an ink jet printer according to the present invention.

FIG. 3 is a perspective view of the curl correcting device according to the present invention.

FIG. 4 is a side view of the curl correcting device according to the present invention.

FIG. 5 is a side view of the curl correcting device according to the present invention.

FIG. 6 is a side view of the curl correcting device according to the present invention.

FIG. 7 is a side view (enlarged view) of the curl correcting device according to the present invention.

FIG. 8 is a paper path diagram of roll paper from a regulating roller to a transport driving roller.

FIG. 9 is a side view of a curl correction device according to a second embodiment of the present invention.

FIG. 10 is a side view (schematic diagram) of a curl correction device according to a conventional technique.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 roll paper holder 4 hopper 15 paper feed roller 17 first frame 18 rear paper guide 19 front paper guide 20 transport drive roller 21 transport driven roller 22 inkjet recording head 26 second frame 27 regulating roller 28 curl correction roller 30 lock lever 31 exposed portion 32 lock pin 33a to 33c U-shaped grooves 34 slide groove 35 fixing member 50 curl straightening device 100 the sheet feeding apparatus 200 ink jet printer R roll paper roll P _R roll paper P _T cut paper

Claims (5)

[Claims] An inkjet recording head that performs recording on roll paper, a transport drive roller that is driven to rotate to transport the roll paper at a constant pitch under the inkjet print head, and a transport drive roller. Nip the roll paper,
A transport driven roller that is pressed against the transport drive roller and that is driven to rotate, wherein a curl that is provided upstream of the transport drive roller and the transport driven roller and that corrects the curl of the roll paper is provided. A curling correction roller having a rotation axis orthogonal to a traveling direction of the roll paper, and a rotatable curl correction roller for winding the roll paper in a direction opposite to the curl habit direction; It has a rotation axis perpendicular to the paper traveling direction and is disposed near the upstream side of the curl correcting roller to regulate the length of winding of the roll paper around the curl correcting roller, in the curl habit direction. A curl correction roller configured to adjust a winding length of the roll paper around the curl correction roller by displacing a position where the curl correction roller is disposed; A roller position adjusting unit, wherein the curl correction roller is provided near an extension of a tangent line at a nip point between the transport driving roller and the transport driven roller when the traveling path of the roll paper is viewed sideways, The roller position adjusting means displaces the position of the curl correcting roller so as to maintain a constant angle at which the roll paper advances from the curl correcting roller to the nip point between the transport driving roller and the transport driven roller. A curl straightening device. 2. The curl correction device according to claim 1, wherein the roller position adjusting means slides the rotation axis of the curl correction roller in a direction orthogonal to the rotation axis of the curl correction roller. And a slide stopper means for fixing a rotation shaft of the roller at a predetermined slide position. 3. The roll position adjusting means according to claim 1, wherein the roller position adjusting means shifts the curl correction roller stepwise to an arrangement position optimized in accordance with the type of roll paper assumed to be used in advance. A curl straightening device characterized in that it is configured to perform the same. 4. A roll paper holder rotatably supporting roll paper, an ink jet recording head for recording on the roll paper, and a rotation drive for conveying the roll paper at a constant pitch under the ink jet recording head. Nipping the roll paper between the transport drive roller and the transport drive roller,
A recording device comprising: a conveyance driven roller that is driven to rotate by being pressed against the conveyance driving roller, wherein the curl correction device according to any one of claims 1 to 3 is provided. Recording device. 5. An ink jet recording head that performs recording on a recording medium by discharging ink droplets, a transport drive roller that is driven to rotate and transports the recording medium at a constant pitch below the inkjet recording head, A transport driven roller that nips the recording medium between the transport roller and the driven roller that is pressed against the transport drive roller and that is driven to rotate; and the transport drive roller and the transport driven roller where the recording medium that is set in an inclined position at the rear of the apparatus is used. And a substantially horizontal feed path in which a recording medium inserted substantially horizontally from the rear of the apparatus is directed toward the transport driving roller and the transport driven roller. A roll paper holder rotatably supporting the paper, provided at the rear of the apparatus, wherein the roll paper is transported using the substantially horizontal feeding path; The curl correction device according to any one of claims 1 to 3, wherein the inclined feeding path merges with the substantially horizontal feeding path. A recording apparatus, wherein the recording apparatus is disposed in an acute-angled area formed in a substantially triangular shape in a side view.