JP2003171046A - Decurler for roll paper and recording device having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately print or to provide an appropriate printing quality by preventing or reducing over-decurling. <P>SOLUTION: This decurler 2 forms a curled state in roll paper P by a pinch roller 37 and an auxiliary roller 47. The pinch roller 37 comprises a drive roller 33, and a driven roller 35 planetarily turning relative to the drive roller 33 and the over-decurling can be reduced by displaying the driven roller 35. Or, the over-decurling in the tip part of the roll paper can be reduced by enhancing the speed when the tip part of the roll paper P passes through the auxiliary roller 47 more than the speed when a part subsequent to the tip part of the roll paper P passes through the auxiliary roller 47. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll paper curl correction device for correcting the curl of roll paper unwound from a roll of roll paper. Further, the present invention relates to a recording device capable of recording on roll paper, which is provided with the roll paper curl correction device.

[0002]

2. Description of the Related Art In a recording apparatus typified by a fax machine, a printer, etc., roll paper capable of recording (printing) over a long length is used. Some printers have been developed which are capable of printing as much as silver halide photographs using roll paper.

On the other hand, the roll paper has a characteristic different from that of ordinary cut paper, that is, it has a property that a curl remains after being unwound because it is wound in a roll shape. Therefore, inconvenience may occur in handling after printing. Therefore, in order to prevent this, a curl correction device for a roll paper that corrects the curl by curling (decaling) the unwound roll paper in the direction opposite to the curl has already been used in various embodiments. It is carried out by.

[0004]

The curl of the roll paper can be corrected by curving it in the direction opposite to the curl as described above. However, depending on the paper quality of the roll paper, the usage environment, etc. Proper correction is not always possible.
When the degree of curl correction is stronger than the original curl of the roll paper, the roll paper bends (overdecals) in the direction opposite to the original curl.

When the roll paper is over-decaled in this way, the following problems occur, for example. That is, in an ink jet printer configured to print on roll paper, when the roll paper is wound with the printing surface facing up, if the roll paper is over-decaled as described above, the front end of the roll paper is fed to the paper transport path. There may be a problem that the printing paper is caught on the way or the tip of the roll paper comes into contact with the ink jet recording head (head rubbing), and an appropriate printing operation or an appropriate printing quality cannot be obtained.

Therefore, the present invention has been made in view of such a problem, and an object thereof is to perform an appropriate printing operation by preventing or reducing overdecal in a curl correction device for roll paper, or The goal is to obtain appropriate print quality.

[0007]

In order to solve the above problems, the roll paper curl correction device according to claim 1 of the present application is
A roll paper curl correction device for correcting a curl of a roll paper unwound from a roll paper roll wound in a roll shape, and a pinching roller for nipping and conveying the roll paper, and the pinching roller. And a curving forming portion that is disposed in the vicinity of the downstream side of the curving member and that curls the roll paper in the direction opposite to the curl, wherein the pressing roller is driven to rotate, and a peripheral surface of the driving roller. And a driven roller that has a peripheral surface that comes into contact with the drive roller in a pressed state, and that is arranged so as to be displaceable at a position where it comes into pressure contact with the drive roller.

According to the present invention, by optimizing the degree of curl correction, the roll paper is warped in the direction opposite to the original curl direction (hereinafter referred to as "overdecal"). It is possible to perform appropriate recording operation in a recording device or the like for recording on a recording material, and further to obtain appropriate recording quality. That is, the roll paper curl correction device is disposed between a pressure roller that clamps and conveys the roll paper, and in the vicinity of the downstream side of the pressure roller,
A curl forming portion that curls the roll paper in the opposite direction to the curl, and the curl forming portion curls the roll paper fed from the pressing roller to correct the curl.

Here, the pinching roller has a driving roller which is rotationally driven, and a peripheral surface which comes into contact with the peripheral surface of the driving roller in a pressed state, and has a position where the pressing roller comes into pressure contact with the driving roller. And a driven roller that is displaceably disposed. Therefore, by displacing the driven roller, it is possible to freely change the angle at which the roll paper advances to the curve forming portion, and thus it is possible to freely change the curvature at the time of decurling, and thus the roll paper. By displacing the driven roller according to the paper quality, the usage environment, etc., overdecal can be reduced or prevented.

According to a second aspect of the present invention, there is provided a roll paper curl correction device according to the first aspect, wherein the curving portion is arranged at a position where it comes into contact with the roll paper fed from the pinching roller. It is characterized in that it is constituted by an auxiliary roller that forms a predetermined curved state on the roll paper by changing the traveling direction and guides the roll paper to the downstream side by rotating.

According to the second aspect of the present invention, the roll paper can smoothly pass through the curve forming portion that forms the curved state in the roll paper. That is, the roll paper fed from the pinching roller contacts the auxiliary roller, changes the traveling direction (curves), and advances to the downstream side. At this time,
Since the roll paper comes into contact with the auxiliary roller that guides the roll paper to the downstream side by rotating, the roll paper contacts the auxiliary roller at a steep angle in order to reduce the curvature when decurling the roll paper. Even if they come into contact with each other, they can proceed to the downstream side without a load, so that the roll paper can smoothly pass.

A roll paper curl correction device according to a third aspect of the present invention bends the curl of a roll paper unwound from a roll paper roll wound in a roll in a direction opposite to the curl. A roll paper curl correction device for correcting by a curving means, comprising a correction amount adjustment device for adjusting the degree of correction of the curl, wherein the correction amount adjustment device is a roll paper tip portion unwound from a roll paper roll. It is characterized in that it is configured so as to correct the curl of the paper more gently than the curl of the roll paper leading end portion and thereafter.

When the roll paper curl correction device is applied to a recording device for recording on a recording material, the problem associated with overdecal is that the tip of the overdecaled roll paper is caught in the conveying path of the recording device. Or
If the overdecal of only the leading edge of the roll paper is reduced or prevented, even if the overdecal after the leading edge of the roll paper is significant, the subsequent conveyance operation or recording is performed. Does not significantly affect the movement.

From this point of view, in the present invention, the correction amount adjusting means for adjusting the degree of curl correction corrects the curl at the leading end of the roll paper more gently than the curl at the leading end and beyond. Configured like this. Therefore, for example, even when the curl of the decal is set small to surely correct the curl, the curl is gently corrected at the leading end of the roll paper, so overdecal at the leading end of the roll paper is reduced or prevented. Thus, it is possible to realize an appropriate recording operation in the recording apparatus or obtain an appropriate recording quality.

According to a fourth aspect of the present invention, there is provided a roll paper curl correction device according to the third aspect, in which the bending means holds the roll paper by sandwiching the roll paper, and near the downstream side of the pressure roller. It is characterized in that it is arranged and comprises a curving portion for curving the roll paper in a direction opposite to the curl. According to the fourth aspect of the present invention, the curving means is arranged in the vicinity of the pressure roller for nipping and transporting the roll paper and in the vicinity of the downstream side of the pressure roller to reverse the roll paper to the curl. Since it is composed of a bending portion that bends in a direction, even if a load is applied to the roll paper by the bending portion, a transport roller that conveys the roll paper is disposed in the vicinity of the bending portion. The roll paper can be reliably conveyed without any bending or the like.

According to a fifth aspect of the present invention, there is provided a roll paper curl correction device according to the fourth aspect, wherein the curving portion is disposed at a position where it comes into contact with the roll paper fed out from the pressure roller. It is characterized in that it is constituted by an auxiliary roller that forms a predetermined curved state on the roll paper by changing the traveling direction and guides the roll paper to the downstream side by rotating.

According to the fifth aspect of the present invention, the roll paper can smoothly pass through the curve forming portion that forms the curved state in the roll paper. That is, the roll paper fed from the pinching roller contacts the auxiliary roller, changes the traveling direction (curves), and advances to the downstream side. At this time,
Since the roll paper comes into contact with the auxiliary roller that guides the roll paper to the downstream side by rotating, the roll paper contacts the auxiliary roller at a steep angle in order to reduce the curvature when decurling the roll paper. Even if they come into contact with each other, they can proceed to the downstream side without a load, so that the roll paper can smoothly pass.

The roll paper curl correction device according to claim 6 of the present application is the device according to claim 4 or 5, wherein the pinching roller is pressed against a driving roller which is rotationally driven and a peripheral surface of the driving roller. And a driven roller which has a peripheral surface in contact with the driven roller and is displaceable at a position where it comes into pressure contact with the drive roller.

According to the sixth aspect of the present invention, the pinching roller has a driving roller which is rotationally driven, and a peripheral surface which is in contact with the peripheral surface of the driving roller in a pressed state, and
Since the driven roller is arranged so as to be displaceable at the position where it is pressed against the drive roller, it is possible to change the direction in which the roll paper is fed out (moving direction) by displacing the driven roller, and thus the roll paper is moved. The curvature of the curved state can be changed, and thus the degree of curl correction can be adjusted easily and freely.

The roll paper curl correction device according to claim 7 of the present application is the device according to any one of claims 3 to 6, wherein the correction amount adjusting means controls the speed V at which the front end of the roll paper passes through the curving means. _By setting _A1 to be greater than the speed V _A2 of the roll paper leading end portion and beyond passing through the curving means, the curl of the roll paper leading end portion is corrected more gently than the roll paper leading end portion and thereafter. It is characterized in that it is configured like. According to the invention described in claim 7, it becomes possible to easily and inexpensively obtain the correction amount adjusting means for adjusting the correction degree of the curl. That is, in view of the fact that the higher the passing speed of the roll paper when passing through the curving means for correcting the curl of the roll paper, the more the degree of curl correction is moderated, the present invention is such that The speed V _A1 of passing through the means is set to be higher than the speed V _A2 of passing through the curving means after the leading edge of the roll paper. Therefore, a component for adjusting the degree of curl correction is not required, and the correction amount adjusting means can be obtained inexpensively and easily.

According to an eighth aspect of the present invention, there is provided a roll paper curl correction device according to any one of the third to sixth aspects, wherein the correction amount adjusting means is used when the leading edge of the roll paper passes through the curving means. By setting the curvature R ₁ to be larger than the curvature R ₂ when the roll paper leading end portion and after passes the curving means, the roll habit of the roll paper leading end portion is made larger than that of the roll paper leading end portion and beyond. It is characterized in that it is configured to be gently corrected.

According to the invention of claim 8 of the present application, no matter what kind of roll paper is used, overdecal at the leading end of the roll paper can be reduced or prevented, and the curving means can be ensured. It is possible to pass it. That is, the correction amount adjusting means makes the curvature R ₁ when the leading end portion of the roll paper passes through the bending means larger than the curvature R ₂ when the leading end portion of the roll paper passes through the bending means. By adjusting the curl correction degree by this, even if the thickness of the roll paper is thick, it is possible to pass the curved part with a gentle curvature without difficulty, and by this, the overdecal of the leading end of the roll paper. Can be reduced or prevented.

A recording device according to claim 9 of the present application is a recording device capable of recording on roll paper, and is provided with the roll paper curl correction device according to any one of claims 1 to 8. Characterize. According to the invention described in claim 9 of the present application, it is possible to obtain the same function and effect as those of the invention described in any one of claims 1 to 8 of the present application in the recording apparatus capable of recording on the roll paper. .

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1. Configuration of inkjet printer 2. Configuration and operation effect of roll paper curl correction device The configuration of the power transmission device and the operational effects will be described in order.

<1. Configuration of Inkjet Printer> Hereinafter, the configuration of an inkjet printer (hereinafter abbreviated as “printer”) 1 according to an embodiment of the present invention will be outlined with reference to FIGS. 1 to 3. Here, FIG. 1 is an external perspective view of the printer 1 (with an outer cover removed), and FIG.
Is a schematic side sectional view of the printer 1, and FIG. 3 is a block diagram of a control system of the printer 1.

In FIGS. 1 and 2, the printer 1 is equipped with a sheet feeding device 5 at the rear of the apparatus (on the left side of FIGS. 1 and 2). The paper feeding device 5 uses a printing paper (cut paper, roll paper, board paper, etc .: hereinafter collectively referred to as “paper”) as a recording material on the downstream side (downstream side in the path where the paper advances: (Right side of FIGS. 1 and 2).

More specifically, as shown in FIG. 1, the paper feeding device 5 includes a roll paper feeding device 11 which rotatably supports a roll paper roll R as shown in FIG. From the rear side of the sheet feeding device 5, the "first feeding path" for feeding and feeding in the direction (obliquely downward direction) and the thick board paper that cannot pass through the curved feeding path are indicated by arrows from the rear side of the sheet feeding device 5. The "second feeding path" for manually feeding in the indicated direction (generally horizontal direction) and the cut sheet (plain paper, photo paper, OHP sheet, etc.) that can pass through the curved feeding path
It is provided with three feeding paths, that is, a “third feeding path” for automatically feeding from the hopper 9 which can be set in a tilted posture in a direction indicated by an arrow (obliquely downward direction), and all of these feeding paths are provided. The path is toward a paper feed roller 19 which will be described later and is provided on the downstream side.

Here, the first feeding path for feeding the roll paper is the roll paper curl correction device (to be referred to as "curl correction device" hereinafter), which will be described later, disposed obliquely forward and downward from the roll paper supply device 11. 2), and after passing through the curl correction device 2, the orientation is changed substantially horizontally, and the upper 6
9, a paper guide rear lower portion 71, a paper guide front upper portion 73, and a paper guide front lower portion 74, and a feeding path that reaches the paper feed roller 19 through a paper path. The second feeding path for feeding the board or the like enters the curl correction device 2 from the rear of the paper feeding device 2 substantially horizontally, and after traversing the curl correction device 2, after the paper guide as described above. It is a feeding path that reaches the paper feed roller 19 through the paper path formed by the upper 69 and the like. Therefore, the first feeding path and the second feeding path
Intersects with the feeding path inside the curl correction device 2 (merges)
When the roll paper P is in the first feeding path, the second feeding path cannot be used.

The hopper 9 forming the third feeding path is swingably provided (clockwise and counterclockwise in FIG. 2) around a swing fulcrum 9a provided at the upper portion, and illustration thereof is omitted. The lower part comes into pressure contact with and separates from the paper feed roller 13 by swinging by the drive mechanism, and the cut paper accumulated on the hopper 9 rotates with the rotation of the paper feed roller 13 by pressure contact. The paper is fed to the paper feed roller 19.
The paper feed roller 13 is configured to be rotationally driven by a drive motor 81 (described later).

The paper feed roller 19 includes a paper feed drive roller 15 which is rotationally driven by a drive motor 81 (described later),
It is composed of a paper feed driven roller 17 which is pressed against the paper feed drive roller 15 and is driven to rotate. The paper feed driven roller 17 is axially supported by the paper feed driven roller holder 18, and a paper detector 12 (see FIG. 3) for detecting passage of the paper is provided so as to project downward from the top of the paper feed driven roller holder 18. A constituent paper detection lever 14 is provided. The paper detection lever 14 is provided so as to be able to swing in the clockwise direction and the counterclockwise direction in FIG. 2, and swings in the direction in which it is pushed upward by the passage of the leading edge of the paper passing under the paper feed driven roller holder 18, and When the trailing edge of the sheet passes, the sheet swings in a downward direction so that the leading edge of the sheet and the sheet size can be detected.

The recording head 2 is provided downstream of the paper feed roller 19.
A platen 25 is provided to face the recording head 21 and the recording head 21. The recording head 21 is provided below the carriage 23, and when ink is supplied from an ink cartridge 24 mounted on the carriage 23, the recording head 21 ejects ink droplets onto the paper pressed against the platen 25. The carriage 23 is a main carriage suspended between a side frame right 8a standing on the right side of the apparatus and a side frame left 8b standing on the left side of the apparatus (see FIG. 1), which constitutes the base of the printer 1. While being guided by the guide shaft 22a and the sub-carriage guide shaft 22b, it receives the driving force of the carriage motor 20 (see FIG. 3) and reciprocates in the main scanning direction (the front-back direction of the paper surface of FIG. 2).

Next, a first paper discharge roller 26 is provided downstream of the recording head 21, and a second paper discharge roller 27 is further provided downstream of the first paper discharge roller 26. The first paper ejection roller 26 and the second paper ejection roller 27 are in point contact with the first paper ejection drive roller 28 and the second paper ejection drive roller 29 which are rotationally driven by a drive motor 81 (described later), respectively. The first ejector serrated roller 3 which is rotated by being driven
No. 0 and the second discharge serrated roller 31. The paper is clamped by these two sets of rollers, and the respective drive rollers are driven to rotate so that the paper is discharged to the discharge tray 10 (see FIG. 1). Is discharged to.

The paper feed roller 13, the paper feed roller 17 (paper feed drive roller 15), and the first paper discharge roller 26 described above.
In the printer 100 according to the present embodiment, the (first paper ejection drive roller 28) and the second paper ejection roller 27 (second paper ejection drive roller 29) are one drive motor 81 as shown in FIG.
It is configured to be rotationally driven by. In FIG. 3, the control unit 4 has a hardware configuration such as a CPU, a memory, and a motor driver (not shown). The control unit 4 drives and controls the carriage motor 20 and the drive motor 81. Detection means, i.e.
Detection signals from the paper detector 12 and the roll paper detector 63 (described later) are input. The drive motor 81 is configured to rotationally drive a pinching roller 37 and an auxiliary roller 47, which will be described later, in addition to the above-described sheet feeding roller 13 and the like. A power transmission device that transmits power from the drive motor 81 to the pressure roller 37 and the auxiliary roller 47 will be described later in detail.

<2. Configuration and Effect of Roll Paper Curl Correction Device> Next, the configuration of the curl correction device 2 will be described in detail with reference to FIGS. 4 to 12 and other drawings as appropriate. Here, FIG. 4 is a side sectional view of the curl correction device 2, FIG. 5 is an external perspective view of the swing frame 50, FIG. 6 is an enlarged side sectional view of the pinching roller 37 portion, and FIG. 7 is a follower roller holder 57. FIG. 8 is an external perspective view, and FIG. 8 is a side view of the swing frame 50. 9 is a side sectional view of the curl correction device 2 in a state in which the roll paper entry angle into the auxiliary roller 47 is changed, and FIG. 10 is a state in which the leading end of the roll paper P is arranged on the auxiliary roller 47. FIG. 3 is a side sectional view of the curl correction device 2.
Further, FIG. 11 is a perspective view showing another embodiment of the pressing roller 37, and FIG. 12 is a side sectional view showing another embodiment of the auxiliary roller 47.

First, an outline of the curl correction device 2 will be described. The curl correction device 2 is a device that corrects the curl of the roll paper P fed from the roll R by a curving unit that curls in a direction opposite to the curl. In FIG. 4, the curl correction device 2 includes a pressure roller 37 that clamps and conveys the roll paper P fed from a roll R, and an auxiliary roller 47 that is arranged in the vicinity of the downstream side of the pressure roller 37.
And the rollers constitute the bending means.

More specifically, the pinching roller 37 has a driving roller 33 which is driven to rotate, and a peripheral surface which comes into contact with the peripheral surface of the driving roller 33 in a pressed state, and is pressed against the driving roller 33. Drive roller 33 and the driven roller 35.
The roll paper P is nipped by and the drive roller 33
Is rotated to feed the roll paper P toward the auxiliary roller 47 on the downstream side. The roll paper P fed out by the pinching roller 37 is curved by coming into contact with the outer peripheral surface of the auxiliary roller 47 as a “guide surface”, changes its direction substantially horizontally, and is guided by the rotation of the auxiliary roller 47. It is designed to proceed further downstream. The drive roller 33 and the auxiliary roller 47 are both the drive motor 8
1 (see FIG. 3), the control unit 4 (see FIG. 3).
Although the rotational speed or the rotational direction can be freely changed by the control by the control (see), the configuration of the power transmission device that transmits the power from the drive motor 81 to these rollers will be described in detail later.

Here, the roll paper P fed from the roll R in the printer 1 has a curl so that it is convex upward, and when the roll paper P contacts the auxiliary roller 47 to change the traveling direction, the roll paper P is lowered. Since a convex curved state is imparted, the curl of the roll paper P is thus corrected, and the curl is reduced or removed after printing, and good printing results can be obtained. When imparting a curved state, since no component contacts the inside of the curved portion,
There is no risk of scratching the printing surface of the roll paper P, and it is possible to perform even better curl correction.

From the above, the auxiliary roller 47 is a "curve forming portion" for curving the roll paper P in the direction opposite to the curl.
Will function as. In addition, the pinching roller 3
The entry angle of the roll paper P entering the auxiliary roller 47 from 7 or the distance (arrangement interval) between the pressure roller 37 and the auxiliary roller 47 is a factor that changes the curvature of the curved state given to the roll paper P. Therefore, it becomes possible to adjust the degree of curl correction by adjusting these. Further, if the speed of the roll paper P passing through the auxiliary roller 47 is changed, the time during which the curled state is imparted to the roll paper P is changed. Therefore, the feeding speed of the roll paper P by the pressing roller 37 (pressing pressure) is changed. The degree of curl correction can also be adjusted by adjusting the circumferential speed of the roller 37: V _A ). Therefore, the means for adjusting the degree of correction of the curl thus becomes the “correction amount adjusting means” in the curl correction device 2.

A roll paper detector 63 is provided on the upstream side of the pressure roller 37. Roll paper detector 63
Includes a detection unit main body 61 and a detection lever 59.
The detection lever 59 is placed in a state of protruding from the detection unit main body 61 to the path of the roll paper P, and is pushed toward the detection unit main body 61 side by the passage of the roll paper P, whereby the passage of the roll paper P is detected. Then, the detection signal is transmitted to the control unit 4. Therefore, by utilizing this, for example, when the roll paper P is first set in the curl correction device 2, a certain time (for example, 2 seconds) has elapsed since the roll paper detector 63 detected passage of the roll paper P. After that, the rotation of the pressure roller 37 can be started and the roll paper P can be loaded. The above is the outline of the curl correction device 2.

Next, the structure of the pressure roller 37 will be described in detail. As shown in FIG. 5, the curl correction device 2 has a roll paper P.
The swing frame 50 is long in the width direction. As shown in FIG. 6, the swing frame 50 has a substantially U-shaped shape in a sectional view, and the U-shaped shape covers the driving roller 33 and the driven roller 35 from above. Further, on the upper surface, the slot 5 which is long in the width direction of the roll paper P
0a is formed, and the roll paper P enters the groove 50a from above and is nipped between the drive roller 33 and the driven roller 35.

The drive roller 33 is composed of a shaft body which is long in the width direction of the roll paper P, and as shown in FIG. 5, the bending portions 50b and 50c (see FIG. 7) at both ends of the swing frame 50 are passed through the shaft. Therefore, the swing frame 50
However, the drive roller 33 can be swung between the state shown by the solid line in FIG. 6 and the state shown by the reference numeral 50 'and the imaginary line with the swing axis as the swing axis.

The driven rollers 35 are arranged on the front side (right side in FIG. 6) of the drive roller 33, and a plurality of driven rollers 35 are arranged in the axial direction of the drive roller 35 (FIG. 7).
reference). As shown in FIG. 6, each driven roller 35 is rotatably supported by a driven roller holder 55, and the driven roller holder 55 is mounted on a swing frame 50 and a drive roller 3 is provided.
It is arranged so that it can move forward and backward with respect to 3.

More specifically, the driven roller holder 55 includes, as shown in FIGS. 6 and 7, a shaft supporting portion 55b for supporting the two driven rollers 35 along the axial direction of the driving roller 33, and in the shaft supporting portion 55b. It has a sliding shaft 55a extending from the intermediate position between the two driven rollers 35 in the direction in which the driven roller 35 should retract (rightward in FIG. 6). The sliding shaft 5
5a is configured to penetrate the U-shaped shape of the swing frame 50 from the inside to the outside, and the coil spring 57 is inserted through the sliding shaft 55a, so that the inside of the swing frame 50 and the shaft support portion 55b. It is designed to apply a spring force to and. Accordingly, the driven roller holder 55 can be moved back and forth with respect to the drive roller 33, and the peripheral surface of the driven roller 35 is always in pressure contact with the peripheral surface of the drive roller 33 by the coil spring 57.

Subsequently, a bent portion 50c forming one end of the swing frame 50 is formed with a gear portion 51 having a continuous concavo-convex shape as shown in FIG. A gear member 77 meshing with the gear portion 51 is provided on a frame member (not shown) that is rotatable so as to be rotatable about a rotation shaft 75a. An operation lever 75 is attached to the gear 77 (see also FIG. 5), and the gear 77 is rotated by operating the operation lever 75, so that as shown in FIGS. 8 (A) and 8 (B). Swing frame 5
0 swings.

Here, the driven roller 35 is the swing frame 5
Since it is pivotally supported by the driven roller holder 55 attached to No. 0, when the swing frame 50 swings with the drive roller 33 as the swing axis, the driven roller 3 as shown in FIG.
5 is displaced around the drive roller 33 (planetary rotation). That is, the driven roller 35 is displaced by the swing of the swing frame 50 at the position where it is pressed against the drive roller 33,
A direction in which the roll paper P is fed out by the displacement (see FIG. 8).
(The direction indicated by the tangent line T) of the roll paper P changes, so that the degree of correction of the curl of the roll paper P can be adjusted.

Incidentally, the operating lever 75 in the present embodiment.
Is shown in FIG.
The state shown in (B), that is, the tangent line T (roll paper P at the contact point between the peripheral surface of the drive roller 33 and the peripheral surface of the driven roller 35).
8A and the state shown in FIG. 8A, that is, the tangent line T is 25.0 deg from the vertical state.
Tilted state (tangential line T from above the device to below the device (see FIG. 8)
It is possible to switch in a stepwise manner from a state in which it is inclined from the upper left to the lower right) of the above) and an intermediate state between these two states, that is, a state in which the same is inclined by 12.5 deg.

By the way, the drive roller 33 is constituted by a shaft body which is long in the width direction of the roll paper P as described above.
FIG. 11A shows a state of the peripheral surface of the drive roller 33. As shown in FIG. 11A, the drive roller 33 according to the present embodiment has a shaft body long in the width direction of the roll paper P. 33
a high friction layer 34a having abrasion resistant particles (for example, ceramic particles) adhered to the outer periphery of a by an adhesive,
The roll paper P is pressed against the high-friction layer 34 by the driven roller 35, so that the roll paper P is reliably transported without slipping. However, the structure is not limited to this, and the structure as shown in FIG.
The rubber roller 34b is disposed on the shaft body 33a which is long in the width direction of the roll paper P, and a plurality of (two in FIG. 11B) driven rollers 35 are disposed on the rubber roller 34b along the circumferential direction. It is also possible to bring the roll paper P into contact with the roll paper P by pressing. In this case, the drive roller 3
Since 3 can be constituted by a rubber roller, the driving roller 3
Cost reduction of 3 can be achieved.

Next, the structure of the auxiliary roller 47 will be described in detail. The auxiliary roller 47 is located in the vicinity of the downstream side of the pressure roller 37 as described with reference to FIG.
It is arranged at a position where it can come into contact with the roll paper P fed from the paper 7. Further, as shown in FIG. 5, a plurality of auxiliary rollers 47 (six in this embodiment) are attached in the width direction of the roll paper P in the axial direction of the shaft body 47a.

The auxiliary roller 47 correctly guides the roll paper P fed from the pressure roller 37 to the downstream side.
The roll paper P is configured to rotate in the advancing direction (clockwise in FIG. 4). That is, the leading edge of the roll paper P contacts the peripheral surface of the auxiliary roller 47, bends, and advances toward the downstream side, so that the plunge angle into the auxiliary roller 47 is a steep angle (for example, the state shown in FIG. 8B). ), The direction in which the leading edge of the roll paper P should advance (front side of the apparatus) (rear side of the apparatus)
Then, there is a possibility that a paper jam will occur. Therefore, in order to prevent this, the auxiliary roller 47 is rotationally driven in the direction in which the roll paper P advances so that the leading end of the roll paper P is reliably guided in the correct direction.

Here, the rotation speed of the auxiliary roller 47 in this embodiment, more specifically, the peripheral speed V _{B of the} outer circumference of the auxiliary roller 47 is set to be higher than the peripheral speed V _A of the pressure roller 37. Has been done. That is, since the paper feed speed of the auxiliary roller 47 is set to be higher than the paper feed speed of the pinching roller 37, it is possible to more reliably guide the leading end of the roll paper P in the correct direction. ing. Here, in the present embodiment, it is configured to surely obtain the above-described operational effect by setting V _B = 2V _A, but if it is set so that V _B ≧ V _A , It is possible to obtain the action and effect. If the outer peripheral surface of the auxiliary roller 47 is made of an elastic material (rubber material in this embodiment), the above-described effects can be obtained at low cost.

Further, the guide function of the leading end of the roll paper P by the auxiliary roller 47 as described above can also be realized by the structure shown in FIG. In FIG. 12, an abutting rod 48 and a gear 49 are arranged on the device rear side of the auxiliary roller 47. The upper surface of the abutting rod 48 has irregularities, so that the gear mechanism 49 is formed by the rack mechanism.
Is rotated counterclockwise in FIG. 12, the abutting rod 4
8 advances toward the roll paper P as shown in FIG. 12A, and the gear 49 rotates clockwise in FIG.
As shown in (B), the roll paper P is retracted. Therefore, as shown in FIG.
When the abutting rod 48 is abutted from the back surface of the front end portion of the roll paper P when it comes into contact with, the front end of the roll paper P can be correctly flown to the downstream side as shown in FIG. 12B.

Next, other functions and effects of the curl correction device 2 described above will be described with reference to FIG. 4 and other drawings as appropriate. First, as described above, the pinching roller 37 has the driving roller 33 that is rotationally driven and the peripheral surface that comes into contact with the peripheral surface of the driving roller 33 in a pressed state.
In addition, since the driven roller 35 is configured to be displaceable at the position where it is pressed against the drive roller 33, the operation roller 75 (see FIG. 5 or 8) is operated to displace the driven roller 35. For example, the angle at which the roll paper P advances to the auxiliary roller 47 can be freely changed. That is, the curvature when the roll paper P is bent can be freely changed. Therefore, if the driven roller 35 is displaced according to the paper quality of the roll paper P, the usage environment, etc., the curl can be corrected more appropriately. It becomes possible to do.

In particular, when the degree of correction of the curl is strong, a phenomenon occurs in which the roll paper P is curved in the direction opposite to the original curl (hereinafter referred to as "overdecal"). Then, when the over-decal occurs on the leading end portion of the roll paper P, the leading end of the roll paper P contacts the recording head 21 and stains the printing surface, or is properly nipped by the first paper ejection roller 26 or the second paper ejection roller 27. Without it, there is a risk of paper jam. Therefore, such a problem can be prevented by displacing the driven roller 35 according to the quality of the roll paper P and adjusting the degree of curl correction.

Next, the position of the driven roller 35 where the pinching roller 37 feeds the roll paper P vertically downward (FIG. 8B).
In the state shown in (1), the angle formed by the roll paper P fed from the pressing roller 37 and the roll paper P that has passed through the auxiliary roller 47 is configured to be a substantially right angle when the transport path is viewed from the side. (See Figure 4). Therefore, the roll paper P changes its traveling direction at a steep angle, whereby a curved state with a small curvature is formed on the roll paper P, and thus the roll paper P is thick at the position of the driven roller 35 so as to realize photographic image quality. Even if it is a coated paper, it is possible to surely correct the curl.

In this embodiment, the pinching roller 3
7 is a driven roller 3 for feeding the roll paper P vertically downward.
5 (the state shown in FIG. 8B), the auxiliary roller 4 is moved from the nip point between the driving roller 33 and the driven roller 35.
7. Since the path length to the contact with the outer peripheral surface is set to 8 mm or less, the curved state formed on the roll paper P is further strengthened, so that the curl can be surely corrected. There is.

Subsequently, the curl correction device 2 according to the present embodiment is configured to correct the curl at the leading end of the roll paper P more gently than the curl at the leading end and beyond. More specifically, the peripheral speed V _A1 of the pinching roller 37 when the leading end of the roll paper P passes through the auxiliary roller 47 is determined by the peripheral speed V _A1 of the pinching roller 37 when the leading end of the roll paper P passes through the auxiliary roller 47. The speed is set to be higher than V _A2 .

That is, the problems associated with over decals are
The leading edge of the over-decaled roll paper P is caught in the middle of the paper path or rubs against the recording head 21. Therefore, if the over-decal only at the leading edge of the roll paper P is reduced or removed, the roll paper P
It is possible to perform a normal printing operation and obtain a normal print quality even if the over-decal after the tip portion is remarkable to some extent. From this point of view, in the present embodiment, the curl of the leading end portion of the roll paper P is configured to be corrected more gently than the curl of the leading end portion of the roll paper P by the above-described means. R
In view of the strong curl of the winding start portion, the curvature of the bending portion is set small by setting the disposition interval between the pressure roller 37 and the auxiliary roller 47 small in order to surely correct the curl. Even in such a case, since the curl is gently corrected at the leading end of the roll paper P, the roll paper P
Over-decal at the tip portion is reduced or prevented, so that an appropriate printing result can be obtained.

In this embodiment, since the degree of curl correction is adjusted by adjusting the peripheral speed V _A of the pinching roller 37 as described above, it is dedicated to the degree of curl correction. Since the component parts are unnecessary, the curl correction device 2
However, the means for adjusting the degree of curl correction as described above is not limited to this, and for example, the curvature R ₁ when the leading end of the roll paper P passes through the auxiliary roller 47. It is possible to obtain the same effect by making the value larger than the curvature R ₂ when the leading end portion of the roll paper P passes through the auxiliary roller 47.

More specifically, in the present embodiment, the driven roller 35 which is manually displaced is configured to be automatically displaced by using the power of a motor or the like, whereby the auxiliary roller 47 of the roll paper P is moved. Can be configured to change the plunging angle of the pressure roller 37, or the pressure roller 37 can be moved back and forth with respect to the auxiliary roller 47 to change the path length between the pressure roller 37 and the auxiliary roller 47. It can also be configured to allow. In particular, when the roll paper P has a large thickness, the transport load when the leading end portion of the roll paper P first passes the auxiliary roller 47 becomes large, and the peripheral speed V _A1 of the pressure roller 37 is reduced. Although it may not be possible to set it to a sufficiently large value, the means for adjusting the curvature R when passing through the auxiliary roller 47 as described above has a gentle curvature even when the roll paper P has a large thickness. Of the roll paper P can be reliably and reliably passed, and thus, it is possible to reduce or prevent overdecal of the leading end portion of the roll paper P.

In addition, in the curl correction device 2 according to the present embodiment, the pinching roller 37 is moved before the pinching roller 37 enters a rest state in which the roll paper P is not fed (conveying operation). Drive control is performed so that the front end of the roll paper P is moved to the auxiliary roller 47.
It is configured to be arranged on the upstream side of (the state shown in FIG. 10). The reason for this is as follows. That is, if the roll paper P is left set in the paper path of the curl correction device 2 for a long time, the curl remains in the portion curved by the auxiliary roller 47, so that the next time printing is started. The remaining portion of the curl may be caught in the middle of the paper path to cause a paper jam, or the distance from the recording head 21 may become nonuniform, resulting in various print quality degradation.

Further, as described above, the first feeding path for feeding the roll paper P and the second feeding path for manually feeding the thick paper that cannot pass through the curved feeding path substantially horizontally. Means that the roll paper P is set in the curl correction device 2, that is, the roll paper P is a paper between the pressure roller 37 and the auxiliary roller 47. When it is present in the path, the second feeding path cannot be used, and therefore, the roll paper P must be removed in advance to use the second feeding path.

Therefore, the curl correction device 2 according to the present embodiment drives and controls the pinching roller 37 before the pinching roller 37 enters the rest state in which the roll paper P is not conveyed, as described above. Since the front end of the roll paper P is arranged on the upstream side of the auxiliary roller 47, and the second feeding path is opened by this, the roll paper P is used for long-term curl correction for long-term correction. The curving state is not formed, the curl habit does not remain on the roll paper P, and when the second feeding path is used next time, it is possible to immediately perform printing without requiring special work. Become.

The pause state in which the pressing roller 37 does not carry the roll paper P is a state in which the paper feeding operation of the roll paper P by the pressing roller 37 is not withheld thereafter (the next paper feeding operation is performed). It means that the time until execution is undecided), for example, a series of print jobs is completed in the printer 1,
In addition, it means a state where the next print job is not waiting.

By the way, the curl correction device 2 is arranged such that when the leading edge of the roll paper P is placed upstream of the auxiliary roller 47 before entering the rest state, the leading edge of the roll paper P is pinched by the pinching roller 37. It is configured to hold. Therefore, it is not necessary to pass the leading end of the roll paper P through the pressing roller 37 when the paper feed operation is started next time, so that the next paper feed operation of the roll paper P can be easily performed. Has become.

<3. Structure and Effect of Power Transmission Device> Next, the drive motor 8 will be described with reference to FIGS.
The configuration and action and effect of the power transmission device 80 that transmits power from the first to the pressure roller 37 and the auxiliary roller 47 will be described. Here, FIGS. 13 and 14 are front views of the gear train that constitutes the power transmission device 80, FIG. 15 is an explanatory view showing the operation of the lock pin 89 (described later), and FIG. 16 is the operation of the planetary lever 95 (described later). FIG.

First, an outline of the power transmission device 80 will be described. The power transmission device 80 is a printer 1 as shown in FIG.
It is provided on the left side frame 8b which constitutes the base body. As shown in FIG. 13, a drive motor 81 is provided on the front side of the left side frame 8b (on the right side in FIG. 13) to rotate the rotary shaft 8 thereof.
1a is fixed so as to be orthogonal to the plane formed by the side frame 8b. Further, the side frame 8b is provided with a plurality of gears such that the disk surface is parallel to the plane formed by the left side frame 8b, and constitutes a gear train of the power transmission device 80. Then, the rotation shaft 81 is provided through the gear train.
From the pinion gear 83 attached to a to the drive roller gear 121 (see FIG. 5) attached to the shaft end of the drive roller 33 described above, which is provided on the rear side (left side in FIG. 13) of the left side frame 8b. The power is transmitted to the auxiliary roller gear 119 attached to the shaft end of the auxiliary roller shaft 47a.

Here, the power transmission device 80 is a first power transmission path (gear train wheel) for transmitting power from the transmission gear 103 to the left as a power transmission path to the drive roller gear 121 and the auxiliary roller gear 119. And a second power transmission path (gear train wheel) that transmits power from the transmission gear 109 to the left, and one of these two power transmission paths is further provided. It has a power transmission switching means for selectively switching. FIG. 13 shows a state in which the turning force of the drive motor 81 is transmitted using the first power transmission path, and FIG. 14 shows a state in which the rotation power is similarly transmitted using the second power transmission path. The arrow in the figure indicates the rotation direction of each gear. The above is the outline of the power transmission device 80.

Hereinafter, the first power transmission path and the second power transmission path will be described.
The detailed structure of the power transmission path and the power transmission switching means will be described. First, in FIG. 13, the first
The power transmission paths of the reference numerals 103, 105, 107, 11
5 and 117, the power of the drive motor 81 is transmitted in that order, and finally the transmission gear 115 is transferred to the drive roller gear 121 and the transmission gear 11 is transferred.
7 transmits power to the auxiliary roller gear 119. Further, the planetary gear 87 transmits power to the first transmission gear 103 of the gear train.

Next, in FIG. 13, the second power transmission paths are designated by reference numerals 109, 111, 113, 115, 117.
Of the drive motor 81 is transmitted in that order. Finally, similarly to the first power transmission path, the transmission gear 115 is connected to the drive roller gear 121 and the transmission gear 117 is connected to the drive roller gear 121. Power is transmitted to the auxiliary roller gear 119. Further, it is the planetary gear 87 that transmits power to the first transmission gear 109 of the gear train, similar to the first power transmission path.

The planetary gear 87 is always meshed with the sun gear 85 and is configured to rotate (revolve) around the sun gear 85. The sun gear 85 constitutes a two-stage gear together with the transmission gear 101, the rotational force of the drive motor 81 is transmitted in the order of the pinion gear 83, the transmission gear 99, the transmission gear 101, and the sun gear 85, and the planetary gear 87 rotates. It is designed to move (rotate).

Here, the planetary gear 87 is pivotally supported by a planetary lever 95 which has the same center of rotation as the sun gear 85 and is freely rotatable independently of the sun gear 85. The planetary lever 95 has a disk shape, and has a first engaging portion 95a and a second engaging portion formed on the outer peripheral portion so as to have a fan-like shape with a large radial dimension as shown in FIGS. Joint part 9
5b are formed. The second engaging portion 95b is provided on the counterclockwise side in FIG. 13 with respect to the first engaging portion 95a, and is formed to have a smaller circumferential dimension than the first engaging portion 95a. The planetary gear 87 has the first engaging portion 95a.
It is attached to the part.

As described above, when the planetary lever 95 rotates, the planetary gear 87 rotates around the sun gear 85, whereby the planetary gear 87 meshes with the transmission gear 103 (first power transmission path). And the meshing state with the transmission gear 109 (second power transmission path). That is, the planetary lever 95 and the planetary gear 87 form a power transmission switching unit in the power transmission device 80.

Next, the position of the planetary lever 95 where the planetary gear 87 meshes with the transmission gear 103 (hereinafter referred to as the "first connecting position") and the planetary lever 95 where the planetary gear 87 meshes with the transmission gear 109. The stopper means for fixing the planetary lever 95 to the position (hereinafter, referred to as "second connecting position") will be described. As shown in FIG. 15, a stopper pin 89 extending in a direction orthogonal to the left side frame 8b is provided so as to pass through the left side frame 8b and be movable back and forth with respect to the planet lever 95.

The stopper pin 89 is constantly urged by the urging spring 90 in the direction of advancing to the planetary lever 95.
When advanced to the planetary lever 95, as shown in FIG. 15A, the tip end thereof can engage with the first engaging part 95a or the second engaging part 95b formed on the outer peripheral part of the planetary lever 95. It is configured to be in the state (FIGS. 13 and 14).
See also). Therefore, when the stopper pin 89 has advanced to the planet lever 95, the rotation operation of the planet lever 95 is restricted. As described above, the first engaging portion 95a and the second engaging portion 95b provided on the planetary lever 95 are provided.
And the stopper pin 89 connect the planet lever 95 to the first
And stopper means for fixing the connecting position and the second connecting position.

On the other hand, the inside of the left side frame 8b (see FIG.
A release lever 91 having a rotating shaft 91a parallel to the vertical direction (front and back direction of the paper surface of FIG. 15) is provided on the right side of 5 from the stopper pin 89 to the front side of the apparatus (lower side of FIG. 15). The release lever 91 includes a lever portion 91c extending from the rotating shaft 91a toward the stopper pin 89, and a rotating shaft 91a.
Has a carriage engaging portion 91b extending in the opposite direction to the lever portion 91c from the lever portion 91c.
It is possible to engage with the lever engaging portion 89a formed in 9. Therefore, when the release lever 91 rotates about the rotation shaft 91a, the lever portion 91c moves the stopper pin 89 in the retracted direction against the urging force of the urging spring 90, whereby the tip end portion of the stopper pin 89. Is disengaged from the planet lever 95, and the planet lever 95 can freely rotate (Fig. 15).
(B) state).

Here, the forward / backward movement of the stopper pin 89, that is, the rotation movement of the release lever 91 is configured to be performed by the carriage 23. The front side of the release lever 91 (lower side in FIG. 15) is a reciprocating region of the carriage 23, and the carriage engaging portion 91b extending from the rotating shaft 91a is projected in the reciprocating region of the carriage 23. Has been formed. Therefore, when the carriage 23 moves to the left end of the reciprocating region, that is, to the side of the side frame left 8b, the carriage 23 is released by pushing the carriage engaging portion 91b as shown in FIG. 15 (A) to FIG. 15 (B). The lever 91 rotates, which causes the stopper pin 89 to move away from the planet lever 95.

Next, the rotating operation of the planetary lever 95 will be described in detail. As shown in FIG. 13, in the first connecting position, the first
Even if the sun gear 85 rotates (clockwise in FIG. 13) in the direction that separates the planetary gear 87 from the transmission gear 103, the stopper pin 89 is located on the side wall of the engaging portion 95a. The meshed state with 103 is maintained. Then, from this state, the stopper pin 8
When 9 is retracted and the sun gear 85 is rotated clockwise in FIG. 13, the planet gear 87 separates from the transmission gear 103 and eventually meshes with the transmission gear 109. Then, when the stopper pin 89 is advanced to the planet lever 95 in this state, as shown in FIG.
As shown in FIG. 4, the stopper pin 8 is provided on the side wall of the second engaging portion 95b.
9 is located so that the planetary gear 87 is transferred to the transmission gear 10
Even if the sun gear 85 rotates in the direction of separating from the gear 9 (counterclockwise rotation in FIG. 14), the meshing state with the transmission gear 109 is maintained.

The operation and effect of the power transmission device 80 configured as above will be described below. In the power transmission device 80, the speed transmission ratio h ₁ when transmitting the turning force of the drive motor 81 to the auxiliary roller gear 119 and the drive roller gear 121 via the transmission gear 103 (first power transmission path).
Similarly, the respective gear trains are configured such that the speed transmission ratio h _{2 at} the time of transmission via the transmission gear 109 (second power transmission path) is h ₁ = 4h ₂ . That is,
By using the transmission gear 109 (second power transmission path), the auxiliary roller gear 119 and the drive roller gear 121 can be rotationally driven with low torque.

This is for the following reason. That is, before
As described above, the curl correction device 2 includes the leading end of the roll paper P.
Corrects the curl of the tape more gently than the curl after the tip
In order to do so, the leading edge of the roll paper P passes through the auxiliary roller 47.
Circumferential velocity V of the pinching roller 37 when performing_A1The roll paper P
Clamping pressure when the tip and the subsequent parts pass the auxiliary roller 47.
La 37 peripheral speed V_A2It is set to be larger than.
Here, when the leading edge of the roll paper P passes through the auxiliary roller 47,
Does the roll paper P have to be curved?
From the leading edge of the roll paper P passes through the auxiliary roller 47.
The transport load is greater than when the roll paper P is
In the case of photo paper or the like, the peripheral speed V _A1Enough
It may not be possible to set a large value.

Therefore, the power transmission device 8 according to the present embodiment.
0 indicates the transmission gear 1 when the leading edge of the roll paper P passes through.
09 (second power transmission path) to transmit the power, thereby reliably rotating and driving the pinching roller 37, and at the time of passing the leading end portion of the roll paper P and thereafter, the transmission gear 103 (first Optimum power transmission can be performed by transmitting power via the power transmission path (1).

By the way, the power transmission switching means in the power transmission device 80 includes the planetary gear 87 and the transmission gear 103.
It has a non-coupling position that is not coupled to either the (first power transmission path) or the transmission gear 109 (second power transmission path). FIG. 16C shows the non-connection position. The stopper pin 89 fixes the planetary lever 95 at the first connecting position by engaging with the side wall of the first engaging portion 95a far from the second engaging portion 95b as described above (see FIG. 16 (A)). )), And the planetary lever 95 is fixed to the second connecting position by engaging with the side wall of the second engaging portion 95b far from the first engaging portion 95a (state of FIG. 16B). However, if the timings of the forward / backward movement of the stopper pin 89 and the rotational movement of the planetary lever 95 are adjusted, the stopper pin 89 is connected to the first engaging portion 95a and the second engaging portion 95a.
It can also be arranged between the engaging portion 95b. By doing so, the planetary gear 87 can be maintained in a state in which it does not mesh with either the transmission gear 103 or the transmission gear 109, and the power transmission device 80 forms a state in which the drive motor 81 is not loaded. can do.

That is, since the drive motor 81 drives various drive targets (for example, the paper feed drive roller 15: see FIG. 2) in the printer 1 as described above, the power transmission device 80 is larger than the drive motor 81. When you give a load,
For example, it may affect the precision feeding operation of the roll paper P by the paper feed driving roller 15, and the print quality may be deteriorated. However, as described above, the power transmission device 80 can form a no-load state, so that it is possible to prevent the above-mentioned inconvenience.

Next, hereinafter, the paper feed speed of the roll paper P by the pressure roller 37 ( _VA : peripheral speed of the pressure roller 37) and the paper of the roll paper P by the paper feed roller 19 (see FIG. 2). feed _rate will be described the relationship between the (V C peripheral speed of the paper feed roller 19). In FIG. 2, the pinching roller 3
The paper feed roller 19 and the paper feed roller 19 are both driven to rotate, and the roll paper P is precisely fed by the paper feed operation by these two rollers. Therefore, the roll paper P
Will be precisely fed to below the recording head 21 by the cooperation of these rollers, and synchronizing the paper feeding operation by the pinching roller 37 and the paper feeding operation by the paper feeding roller 19 will produce an appropriate printing result. It will be important in gaining.

Therefore, in the printer 1, the paper feed speed by the pressure roller 37 (the peripheral speed V _A of the pressure roller 37) is set to the paper feed speed by the paper feed roller 19 (the peripheral speed V _C of the paper feed roller 19). It is set to be larger than. Hereinafter, the function and effect obtained by making the peripheral speed V _A of the pressure roller 37 higher than the peripheral speed V _C of the paper feed roller 19 will be described.

An auxiliary roller 47 is arranged in the vicinity of the downstream side of the pressure roller 37, and the roll paper P abuts on the auxiliary roller 47 and is curved and advances to the downstream side. Therefore,
The auxiliary roller 47 serves as a conveyance load generation unit that generates a conveyance load on the pressure roller 37. When the conveyance load generation unit is provided, the roll paper P slips on the pressure roller 37, or the pressure roller 37 moves. A situation occurs in which the vehicle does not rotate a predetermined amount. Then, synchronization with the paper feed roller 19 located on the downstream side of the auxiliary roller 47 is lost, and as a result, the precision feed operation of the roll paper P by the paper feed roller 19 is adversely affected, and the print quality may be deteriorated. is there.

Therefore, in the printer 1, as described above, the peripheral speed V _A of the pressure roller 37 is set to be higher than the peripheral speed V _B of the paper feed roller 19, which causes the existence of the auxiliary roller 47. Conveying load and pressure roller 3
The paper feeding operation by which the paper feeding amount is slightly larger than the paper feeding roller 19 by 7 is canceled. Therefore, this does not affect the precision feeding operation of the roll paper P by the paper feeding roller 19 and an appropriate print quality can be obtained. Note in this case, that the circumferential velocity V _A of the nipping rollers 37 depending on the size of the transport load generated by the auxiliary roller 47 and the peripheral velocity V _C of the paper feed roller 19 is determined is preferred.

By the way, when the peripheral speed V _A of the pinching roller 37 is higher than the peripheral speed V _C of the paper feed roller 19, as a result, the amount of advance of the roll paper P moving downstream from the auxiliary roller 47 is increased. It may be larger than the paper feed amount by 19. In such a case, the roll paper P is bent in the paper path from the auxiliary roller 47 to the paper feed roller 19. This bending is especially due to the roll R of one roll.
In the case where continuous printing is performed, the size is not negligible, which may cause a paper jam in the middle of the paper path.

Therefore, in the printer 1 according to this embodiment, guide means for restricting the bending of the roll paper P is provided in the paper path from the auxiliary roller 47 to the paper feed roller 19. In FIG. 2, the paper guide rear upper 69, the paper guide rear lower 71, the paper guide front upper 73, the paper guide front lower 74, and the paper feed driven roller holder 18 constitute the guide means,
The roll paper P from the auxiliary roller 47 toward the paper feed roller 19 is guided on the front and back sides by the guide means, and its bending is regulated.

Therefore, there is no fear that the roll paper P will be extremely bent in the paper path from the auxiliary roller 47 to the paper feed roller 19, and that the paper jam will be caused by the bending. It is possible to perform a smooth paper feeding operation. In this case, the deflection regulated by the guide means is exclusively caused by the paper feed roller 1.
The roll paper P is released by being excessively fed downstream from the paper feed roller 19 through the slip phenomenon in 9. Therefore, it is desirable that the difference between the amount of advance of the roll paper that advances downstream from the auxiliary roller 47 and the amount of paper feed by the paper feed roller 19 is such that the print quality in the recording head 21 can be maintained above a certain level. .

Further, instead of providing the guide means to regulate the flexure of the roll paper P as in the present embodiment, the flexure of the roll paper P is cut in the middle of the paper path from the auxiliary roller 47 to the paper feed roller 19. A bending space may be provided so that it can be safely absorbed without causing a jam. In this case, since the bending of the roll paper P has almost no effect on the precision feeding operation of the paper feeding roller 19, it is possible to obtain a higher quality printing result.

The pinching roller 37 described above is referred to as "first
When the paper feed roller 19 is the “second transport roller” and the auxiliary roller 47 is the “transport load generating section”, the configuration of the present embodiment is limited to the curl correction device 2. It is possible to obtain the above-described operational effects without the need. That is, a "first conveying roller" that nips and conveys the conveying medium and a first conveying roller that is provided in the vicinity of the downstream of the first conveying roller and applies a load to the conveying medium fed from the first conveying roller. A "conveyance load generation unit" that generates a conveyance load on the first conveyance roller, and a "second conveyance roller" that is provided downstream of the conveyance load generation unit and nips a conveyance medium and precisely feeds the conveyance medium to the downstream side. In a "conveying medium feeding device" including: if the feeding speed of the feeding medium by the first feeding roller is set to be higher than the feeding speed of the feeding medium by the second feeding roller, The conveyance load generated by the conveyance load generation unit and the conveyance medium feeding operation of the first conveyance roller, which has a slightly larger feed amount than the second conveyance roller, cancel each other out, whereby the second conveyance roller accurately Without affecting the feeding operation, it is possible to perform a proper conveying operation.

[0092]

As described above, according to the present invention, a pinching roller that nips and conveys roll paper, and a roller located near the downstream side of the nipping roller to roll the roll paper against the curl. In a curl correction device for a roll paper that corrects a curl of a roll paper unwound from a roll paper roll wound in a roll shape, including a curving forming portion that curls in the opposite direction, the pinching roller is A driving roller that is rotationally driven, and a driven roller that has a peripheral surface that comes into contact with the peripheral surface of the driving roller in a pressed state, and that is arranged so that the position where the driving roller comes into pressure contact can be displaced. It is configured. Therefore, by displacing the driven roller, it is possible to freely change the angle at which the roll paper advances to the curve forming portion, and thus it is possible to freely change the curvature at the time of decurling, and thus the roll paper. By displacing the driven roller according to the paper quality, the usage environment, etc., overdecal can be reduced or prevented.

[Brief description of drawings]

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

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

FIG. 3 is a block diagram of a control system of the inkjet printer according to the present invention.

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

FIG. 5 is an external perspective view of a swing frame.

FIG. 6 is a side view of a pinching roller.

FIG. 7 is an external perspective view of a driven roller holder.

FIG. 8 is a side view of the swing frame.

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

FIG. 10 is a side sectional view of the curl correction device according to the present invention.

FIG. 11 is a perspective view showing another embodiment of the pinching roller of the curl correction device according to the present invention.

FIG. 12 is a side sectional view showing another embodiment of the auxiliary roller of the curl correction device according to the present invention.

FIG. 13 is a front view of a gear train of the power transmission device.

FIG. 14 is a front view of a gear train of the power transmission device.

FIG. 15 is an explanatory diagram showing the operation of the lock pin.

FIG. 16 is an explanatory diagram showing the operation of the planetary lever.

[Explanation of symbols]

1 inkjet printer 2 Roll paper curl correction device 5 Paper feeder 8 frames 8a Side frame right 11 Roll paper supply device 12 Paper detector 13 Paper feed roller 19 Paper feed roller 20 carriage motor 21 print head 23 carriage 26 First Paper Ejecting Roller 27 Second ejection roller 37 pinching roller 47 Auxiliary roller 50 swing frame 63 Roll paper detector 80 power transmission device 85 sun gear 87 Planetary gears 89 Lock pin 95 Planetary lever 99-117 transmission gear 119 Auxiliary roller gear 121 Drive roller gear R roll paper roll P roll paper

Claims (9)

[Claims] 1. A roll paper curl correction device for correcting a curl of a roll paper unwound from a roll paper roll wound into a roll, and a pinching roller for nipping and conveying the roll paper. A bend forming portion that is arranged in the vicinity of the downstream side of the pressure roller and that bends the roll paper in the direction opposite to the curl, wherein the pressure roller is a rotationally driven drive roller. And a driven roller that has a peripheral surface that comes into contact with the peripheral surface of the drive roller in a pressed state, and that is arranged so as to be displaceable at a position where the drive roller is pressed against the peripheral surface. Habit correction device. 2. The curved forming portion according to claim 1,
The roll paper is placed at a position where it comes into contact with the roll paper fed from the pinching roller, and a predetermined curved state is formed in the roll paper by changing the traveling direction of the roll paper, and the roll paper is moved downstream by rotating. A roll paper curl correction device comprising an auxiliary roller for guiding to a roll paper. 3. A roll paper curl correction device for correcting a curl of a roll paper unwound from a roll paper roll wound in a roll shape by a curving means for curving the roll paper in a direction opposite to the curl. Therefore, a correction amount adjusting means for adjusting the degree of correction of the curl is provided, and the correction amount adjusting means adjusts the curl of the leading end portion of the roll paper unwound from the roll paper roll to the curl after the leading end portion of the roll paper. A roll paper curl correction device characterized in that it is configured to be corrected more gently. 4. The pressing means according to claim 3, wherein the curving means is arranged near the pressure roller that nips and conveys the roll paper, and is arranged in the vicinity of the downstream side of the pressure roller, and the roll paper is in a direction opposite to the curl. A curl correction device for roll paper, comprising: 5. The curved forming portion according to claim 4,
The roll paper is placed at a position where it comes into contact with the roll paper fed from the pinching roller, and a predetermined curved state is formed in the roll paper by changing the traveling direction of the roll paper, and the roll paper is moved downstream by rotating. A roll paper curl correction device comprising an auxiliary roller for guiding to a roll paper. 6. The driving roller according to claim 4, wherein the pressure roller has a driving roller that is rotationally driven, and a peripheral surface that is in contact with the peripheral surface of the driving roller in a pressed state. A roll paper curl correction device comprising: a driven roller which is disposed so as to be displaceable at a position where it is pressed against the roller. 7. The correction amount adjusting means according to claim 3, wherein the correction amount adjusting means sets a speed V _{A1 at} which the roll paper leading end passes through the bending means, The roll is characterized in that it is configured so that the curl of the leading end portion of the roll paper is corrected more gently than the curl of the leading end portion of the roll paper by setting the speed to be higher than the passing speed V _A2. Paper curl correction device. 8. The correction amount adjusting means according to claim 3, wherein the correction amount adjusting means determines the curvature R ₁ when the leading end portion of the roll paper passes through the bending means, and the curvature after the leading end portion of the roll paper is the curvature. By setting the curvature to be larger than the curvature R ₂ when passing through the means, the curl at the leading edge of the roll paper is configured to be corrected more gently than the curl at the leading edge and beyond. Characteristic roll curl correction device. 9. A recording apparatus capable of recording on roll paper, comprising the roll paper curl correction device according to any one of claims 1 to 8.