JP3770313B2 - Roll paper curl correction device and recording apparatus provided with the roll paper curl correction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roll paper curl correction device for correcting curl of a roll paper unwound from a roll paper roll wound in a roll shape. The present invention also relates to a recording apparatus capable of recording on roll paper, provided with the roll paper curl correction device.
[0002]
[Prior art]
In recording apparatuses represented by FAX, printers, and the like, roll paper capable of performing recording (printing) over a long length is used. In recent years, in consumer printers that realize photographic image quality, roll paper is used. A material that can be printed on the same level as a silver salt photograph has been developed.
[0003]
On the other hand, roll paper has a different characteristic from ordinary cut paper, that is, because it is wound into a roll, it has the property that curls remain after unrolling. Inconvenience may occur in subsequent handling. Therefore, in order to prevent this, various forms of roll paper curl correction devices for correcting curl are obtained by curving (decaling) the unrolled roll paper in the opposite direction to the curl. Has been implemented by.
[0004]
[Problems to be solved by the invention]
By the way, the curl of the roll paper can be corrected by curving in the direction opposite to that of the curl as described above. However, depending on the paper quality of the roll paper, the usage environment, etc., it is not always possible to correct appropriately. . When the degree of curl correction is stronger than the original roll paper curl, the roll paper is bent (over-decal) in the opposite direction to the original curl.
[0005]
When the roll paper is over-decaled in this way, for example, the following problems occur. That is, in an inkjet printer configured to be able 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 leading edge of the roll paper is moved to the paper transport path. There is a problem that the paper is caught in the middle 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 print quality cannot be obtained.
[0006]
Accordingly, the present invention has been made in view of such problems, and the problem is that a roll paper curl correction device performs an appropriate printing operation by preventing or reducing over-decal, or an appropriate printing. The goal is to ensure quality.
[0007]
[Means for Solving the Problems]
A roll paper curl correction device for solving the above-mentioned problems is a roll paper curl correction device that corrects curl of a roll paper unwound from a roll paper roll wound in a roll shape. A pinching roller that pinches and conveys the paper; and a curve forming portion that is disposed in the vicinity of the downstream side of the pinching roller and curves the roll paper in the opposite direction with respect to the curl. A driving roller that is rotationally driven, and a driven roller that has a peripheral surface that is in contact with the peripheral surface of the driving roller in a pressed state, and that is disposed so as to be displaceable at a position that presses the driving roller. It is characterized by becoming.
[0008]
According to the present invention, by optimizing the degree of correction of curl, the phenomenon that the roll paper warps in the direction opposite to the original curl direction (hereinafter referred to as “over decal”) is effectively reduced. Alternatively, an appropriate recording operation can be performed in a recording apparatus or the like for recording on a recording material, and an appropriate recording quality can be obtained. That is, the roll paper curl correction device is disposed near the downstream side of the pressure roller that sandwiches and transports the roll paper, and forms a curve that curves the roll paper in the opposite direction to the curl. A roll paper fed from the pressure roller is bent by the curve forming portion to correct curl.
[0009]
Here, the pinching 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, and the position that presses the driving roller can be displaced. And a driven roller provided. Accordingly, by displacing the driven roller, the angle at which the roll paper advances to the curve forming portion can be freely changed, and thereby the curvature at the time of decurling can be freely changed. If the driven roller is displaced according to the paper quality, usage environment, etc., over-decal can be reduced or prevented.
[0010]
Further, in the roll paper curl correction device, the curve forming portion is disposed at a position in contact with the roll paper fed from the pinching roller, and the roll paper has a predetermined direction by changing a traveling direction of the roll paper. It is configured by an auxiliary roller that forms a curved state and guides the roll paper to the downstream side by rotating.
[0011]
According to the present invention, it becomes possible for the roll paper to pass smoothly through a curve forming portion that forms a curved state on the roll paper. That is, the roll paper fed out from the pinching roller contacts the auxiliary roller, changes its direction of travel (curves), and proceeds downstream. At this time, the roll paper abuts on the auxiliary roller that guides the roll paper to the downstream side by rotating. Therefore, in order to reduce the curvature when the roll paper is decurled, the auxiliary paper is applied at a steep angle. Even if it is brought into contact with the roller, it can proceed to the downstream side without load, so that the roll paper can be passed smoothly.
[0012]
Moreover, the roll paper curl correction apparatus for solving the said subject curves the curl of the roll paper unwound from the roll paper roll wound by roll shape in the reverse direction with respect to the said curl A roll paper curl correcting device that corrects by a bending means, comprising a correction amount adjusting means for adjusting the degree of correction of curl, wherein the correction amount adjusting means is unrolled from the roll paper roll. Is characterized in that the curl is corrected more slowly than the curl after the leading edge of the roll paper.
[0013]
When the roll paper curl correction device is applied to a recording device that records on a recording material, the problem with over-decal is that the roll paper tip that has been over-decal is caught in the conveyance path of the recording device, or Therefore, if over decurling only at the leading end of the roll paper is reduced or prevented, even if the over decurling after the leading end of the roll paper is remarkable, the subsequent conveying operation or recording is performed. Does not affect the operation so much.
[0014]
From this point of view, the present invention is configured such that the correction amount adjusting means for adjusting the degree of correction of the curl corrects the curl at the leading end of the roll paper more slowly than the curl at the leading end of the roll paper. did. Therefore, for example, even when the curvature of the decal is set to be small in order to correct the curl, the curl is gently corrected at the leading edge of the roll paper, so that the over-decal at the leading edge of the roll paper is reduced or prevented. Thus, an appropriate recording operation can be realized in the recording apparatus, or an appropriate recording quality can be obtained.
[0015]
Further, in the roll paper curl correction device, the bending means is disposed near the downstream side of the pinch roller for sandwiching and transporting the roll paper, and the roll paper is placed against the curl. It is characterized by comprising a curve forming portion that curves in the opposite direction. According to the present invention, the bending means is disposed near the downstream side of the pressure roller, which sandwiches and conveys the roll paper, and is curved to curve the roll paper in the opposite direction with respect to the curl. Therefore, even if a roll paper load is generated by the curved forming section, the roll paper is bent near the curved forming section, so that the roll paper is bent. And roll paper can be reliably conveyed.
[0016]
Further, in the roll paper curl correction device, the curve forming portion is disposed at a position in contact with the roll paper fed from the pinching roller, and the roll paper has a predetermined direction by changing a traveling direction of the roll paper. It is configured by an auxiliary roller that forms a curved state and guides the roll paper to the downstream side by rotating.
[0017]
According to the present invention, it becomes possible for the roll paper to pass smoothly through a curve forming portion that forms a curved state on the roll paper. That is, the roll paper fed out from the pinching roller contacts the auxiliary roller, changes its direction of travel (curves), and proceeds downstream. At this time, the roll paper abuts on the auxiliary roller that guides the roll paper to the downstream side by rotating. Therefore, in order to reduce the curvature when the roll paper is decurled, the auxiliary paper is applied at a steep angle. Even if it is brought into contact with the roller, it can proceed to the downstream side without load, so that the roll paper can be passed smoothly.
[0018]
Further, in the roll paper curl correction device, the pinching 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, and the driving It is characterized by comprising a driven roller disposed so as to be displaceable at a position in pressure contact with the roller.
[0019]
According to the present invention, the pinching roller has a driving roller that is rotationally driven, a peripheral surface that is in contact with the peripheral surface of the driving roller in a pressed state, and a position that presses the driving roller. Since the driven roller is arranged so as to be displaceable, the roll paper feeding direction (traveling direction) can be changed by displacing the driven roller, thereby changing the curvature of the roll paper in a curved state. Therefore, the degree of curling correction can be easily and freely adjusted.
[0020]
Further, in the roll paper curl correction device, the correction amount adjusting means has a speed V _{A1 at} which the leading end portion of the roll paper passes through the bending means, and a speed V _{A2 at} which the leading end portion of the roll paper passes through the bending means. In other words, the curl at the leading end of the roll paper is corrected more slowly than the curl at the leading end of the roll paper. According to the present invention, it is possible to easily and inexpensively obtain a correction amount adjusting means for adjusting the degree of curl correction. That is, in view of the fact that the degree of correction of curl becomes gentler as the passing speed of the roll paper at the time of passing through the curving means for correcting curl of the roll paper becomes faster, the present invention is such that the leading end of the roll paper is curved The speed V _A1 passing through the means was set to be higher than the speed V _A2 passing through the bending means after the leading end of the roll paper. Therefore, this eliminates the need for a component for adjusting the degree of correction of curl, so that the correction amount adjusting means can be obtained inexpensively and easily.
[0021]
Further, in the roll paper curl correction device, the correction amount adjusting means has a curvature R ₁ when the roll paper tip portion passes through the bending means, and when the roll paper tip portion and the subsequent parts pass through the bending means. By making the curvature R ₂ larger than the above, the curl at the leading end of the roll paper is more gently corrected than the curl at the leading end of the roll paper.
[0022]
According to the present invention, it is possible to reduce or prevent over-decal at the leading end of the roll paper and reliably pass the bending means regardless of the type of roll paper. In other words, correction amount adjustment means, the curvature R ₁ when the roll paper tip portion passes through the curved section, to such larger becomes than the curvature R ₂ at the time of subsequent roll paper tip portion passes through the curved section Therefore, even if the roll paper is thick, it can be passed through the curved part with a gentle curvature without difficulty. Can be reduced or prevented.
[0023]
Further, according to the recording apparatus capable of recording on roll paper provided with any one of the above roll paper curl correction devices, it is possible to obtain the same effects as the roll paper curl correction device described above.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1. 1. Inkjet printer configuration 2. Configuration and effect of roll paper curl correction device The configuration and the operational effect of the power transmission device will be described in this order.
[0025]
<1. Configuration of inkjet printer>
The configuration of an ink jet printer (hereinafter simply referred to as “printer”) 1 according to an embodiment of the present invention will be outlined below with reference to FIGS. 1 to 3. 1 is an external perspective view of the printer 1 (with an external cover removed), FIG. 2 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.
[0026]
1 and 2, the printer 1 includes a paper feeding device 5 on the rear side of the apparatus (the left side in FIGS. 1 and 2). The paper feeder 5 is a printing paper (sheet paper, roll paper, board paper, etc .: hereinafter collectively referred to as “paper”) as a recording material, and downstream (downstream side in the path along which the paper travels): The right side of FIG. 1 and FIG.
[0027]
More specifically, the paper feeding device 5 is indicated by an arrow (1) as shown in FIG. 2 from the roll paper supply device 11 that pivotally supports the roll paper roll R so as to freely rotate as shown in FIG. The “first feeding path” that feeds out in the direction (diagonally downward) and the thick board paper that cannot pass through the curved feeding path is indicated by an arrow ▲ from the rear side of the sheet feeding device 5. 2 A “second feeding path” for manual feeding in the direction indicated by ▼ (substantially horizontal direction) and a cut sheet paper (plain paper, photographic paper, OHP sheet, etc.) that can pass through the curved feeding path Are provided with three feeding paths, a “third feeding path” that automatically feeds the sheet from the hopper 9 that can be set in a plurality of inclined postures in the direction indicated by the arrow (3) (diagonally downward), All of these feeding paths are directed toward a paper feeding roller 19 provided later on the downstream side. .
[0028]
Here, the first feeding path for feeding the roll paper is referred to as a roll paper curl correction device (hereinafter referred to as “curl curl correction device”), which is disposed obliquely forward and downward from the roll paper supply device 11. ) 2, and after passing through the curl correction device 2, the direction is changed substantially horizontally, and is formed by a paper guide rear upper 69, a paper guide rear lower 71, a paper guide front upper 73, and a paper guide front lower 74. This is a feed path that passes through the paper path and reaches the paper feed roller 19. Further, the second feeding path for feeding board paper or the like enters the curl correction device 2 substantially horizontally from the rear of the paper supply device 2, crosses the curl correction device 2, and after the paper guide as described above. This is a feeding path that passes through the paper path formed by the top 69 and the like and reaches the paper feeding roller 19. Accordingly, the first feeding path and the second feeding path are configured to intersect (join) inside the curl correction device 2 and when the roll paper P is in the first feeding path. The second feeding path cannot be used.
[0029]
The hopper 9 that forms the third feeding path is provided so as to be able to swing around a swinging fulcrum 9a provided in the upper part (clockwise and counterclockwise in FIG. 2). By swinging, the lower part is pressed against and separated from the paper feed roller 13, and the sheet paper accumulated on the hopper 9 is turned along with the rotation of the paper feed roller 13 by the pressure contact. 19 is fed. The paper feed roller 13 is configured to be rotationally driven by a drive motor 81 (described later).
[0030]
The paper feed roller 19 includes a paper feed drive roller 15 that is rotationally driven by a drive motor 81 (described later), and a paper feed driven roller 17 that is driven to rotate while being in pressure contact with the paper feed drive roller 15. . The paper feed driven roller 17 is pivotally supported by a paper feed driven roller holder 18, and a paper detector 12 (see FIG. 3) that detects the passage of the paper so as to protrude downward from above the paper feed driven roller holder 18. A paper detection lever 14 is provided. The paper detection lever 14 is provided so as to be able to swing clockwise and counterclockwise in FIG. 2, swings in a direction of being pushed upward by the passage of the leading edge of the paper passing through the lower part of the paper feed driven roller holder 18, and By swinging in the downward direction due to the passage of the rear end of the paper, the passage of the front edge of the paper and the paper size can be detected.
[0031]
A recording head 21 and a platen 25 facing the recording head 21 are provided downstream of the paper feed roller 19. The recording head 21 is provided below the carriage 23, and ejects ink droplets onto a sheet pressed against the platen 25 by being supplied with ink from an ink cartridge 24 mounted on the carriage 23. The carriage 23 is a main carriage hung between a side frame right 8a erected on the right side of the apparatus and a left side frame 8b (see FIG. 1) erected on the left side of the apparatus. While being guided by the guide shaft 22a and the sub-carriage guide shaft 22b, the driving force of the carriage motor 20 (see FIG. 3) is received to reciprocate in the main scanning direction (the front and back direction in FIG. 2).
[0032]
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 discharge roller 26 and the second paper discharge roller 27 are respectively point-contacted with a first paper discharge drive roller 28 and a second paper discharge drive roller 29 that are rotationally driven by a drive motor 81 (described later). Thus, the first paper discharge jagged roller 30 and the second paper discharge jagged roller 31 that are driven to rotate are configured. The paper is clamped by these two sets of rollers, and each drive roller is driven to rotate. The paper is discharged to the paper discharge tray 10 (see FIG. 1).
[0033]
The paper feed roller 13, paper feed roller 17 (paper feed drive roller 15), first paper discharge roller 26 (first paper discharge drive roller 28), and second paper discharge roller 27 (second paper discharge drive roller 29) described above. ) Is configured to be rotationally driven by one drive motor 81 as shown in FIG. 3 in the printer 100 according to the present embodiment. 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 signals from detection means, that is, a paper detector 12 and a roll paper detector 63 (described later) are input. The drive motor 81 is configured to rotationally drive a nipping roller 37 and an auxiliary roller 47 described later, in addition to the paper feed roller 13 and the like described above. The power transmission device that transmits power from the drive motor 81 to the pinching roller 37 and the auxiliary roller 47 will be described in detail later.
[0034]
<2. Configuration and effects of roll paper curl correction device>
Next, the configuration of the curl correction apparatus 2 will be described in detail with reference to FIGS. 4 to 12 and other drawings as appropriate. 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 nipping roller 37 portion, and FIG. FIG. 8 is a side view of the swing frame 50. FIG. 9 is a side sectional view of the curl correction device 2 in a state where the roll paper entry angle to 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. It is a sectional side view of the curl correction apparatus 2 of this. FIG. 11 is a perspective view showing another embodiment of the pinching roller 37, and FIG. 12 is a side sectional view showing another embodiment of the auxiliary roller 47.
[0035]
First, an outline of the curl correction apparatus 2 will be described. The curl correction device 2 is a device that corrects the curl of the roll paper P fed out from the roll R by a bending means for curving in a direction opposite to the curl. In FIG. 4, the curl correction device 2 includes a pressure roller 37 that sandwiches and conveys the roll paper P fed from the roll R, and an auxiliary roller 47 that is disposed in the vicinity of the downstream side of the pressure roller 37. And the bending means is constituted by these rollers.
[0036]
More specifically, the pinching roller 37 has a driving roller 33 that is rotationally driven, a circumferential surface that is in contact with the circumferential surface of the driving roller 33 in a pressed state, and a position that is in pressure contact with the driving roller 33. The roll paper P is composed of a driven roller 35 disposed so as to be displaceable. The roll paper P is sandwiched between the drive roller 33 and the driven roller 35, and the roll paper P is rotated by rotating the drive roller 33. Move towards 47. The roll paper P fed out by the pinching roller 37 is bent by coming into contact with the outer peripheral surface of the auxiliary roller 47 as a “guide surface”, is turned substantially horizontally, and is guided by the rotation of the auxiliary roller 47. It goes further downstream.
Both the driving roller 33 and the auxiliary roller 47 are rotationally driven by a driving motor 81 (see FIG. 3), and the rotational speed or the rotational direction can be freely changed by the control by the control unit 4 (see FIG. 3). The configuration of the power transmission device that transmits power from the drive motor 81 to these rollers will be described in detail later.
[0037]
Here, the roll paper P fed out of the roll R in the printer 1 has a curl that protrudes upward, and protrudes downward when changing the traveling direction by contacting the auxiliary roller 47. Since the curved state is imparted, the curl of the roll paper P is thereby corrected, and after printing, the curl is reduced or removed, and a good printing result can be obtained. At the time of application, since no components are in contact with the inside of the curved portion, there is no possibility of scratching the printing surface of the roll paper P, and it becomes possible to perform even better curl correction. ing.
[0038]
From the above, the auxiliary roller 47 functions as a “curve forming portion” that bends the roll paper P in the opposite direction with respect to the curl. Further, the rush angle of the roll paper P that rushes into the auxiliary roller 47 from the nipping roller 37 or the distance (arrangement interval) between the nipping roller 37 and the auxiliary roller 47 is a curved state applied to the roll paper P. It becomes a factor which changes a curvature, Therefore, it becomes possible to adjust the correction degree of a curl 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 roll paper P is curved is changed. Therefore, the feed speed (rolling pressure) of the roll paper P by the pinching roller 37 is accordingly changed. The degree of curl correction can also be adjusted by adjusting the peripheral speed (V _A ) of the roller 37. Therefore, the means for adjusting the degree of curl correction in this way is the “correction amount adjusting means” in the curl correction apparatus 2.
[0039]
A roll paper detector 63 is provided on the upstream side of the nipping roller 37. The 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 in the path of the roll paper P. When the roll paper P passes, the detection lever 59 is pushed toward the detection unit main body 61, thereby detecting the passage of the roll paper P. The detection signal is transmitted to the control unit 4. Therefore, using 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 the passage of the roll paper P. Later, the rotation of the nipping roller 37 can be started, and the roll paper P can be loaded.
The above is the outline of the curl correction apparatus 2.
[0040]
Next, the configuration of the pressure roller 37 will be described in detail. As shown in FIG. 5, the curl correction device 2 includes a swing frame 50 that is long in the width direction of the roll paper P. As shown in FIG. 6, the swing frame 50 has a substantially U-shape when viewed in cross-section, and has a shape that covers the driving roller 33 and the driven roller 35 from above by the U-shape. Further, a slot 50a that is long in the width direction of the roll paper P is formed on the upper surface, and the roll paper P enters the slot 50a from above and is nipped between the driving roller 33 and the driven roller 35. ing.
[0041]
The drive roller 33 is constituted by a shaft body that is long in the width direction of the roll paper P, and as shown in FIG. 5, by passing through the bent portions 50b and 50c (see FIG. 7) at both ends of the swing frame 50, The swing frame 50 can swing between a state indicated by a solid line in FIG. 6 and a state indicated by a reference numeral 50 ′ and a virtual line with the drive roller 33 as a swing axis.
[0042]
The driven roller 35 is disposed on the front side of the apparatus (right side in FIG. 6) with respect to the driving roller 33, and a plurality of driven rollers 35 are disposed in the axial direction of the driving roller 35 (see FIG. 7). As shown in FIG. 6, each driven roller 35 is pivotally supported by a driven roller holder 55 so that the driven roller holder 55 can move forward and backward with respect to the driving roller 33 with respect to the swing frame 50. It is arranged.
[0043]
More specifically, the driven roller holder 55 includes a shaft support portion 55b that supports the two driven rollers 35 along the axial direction of the drive roller 33 and two driven members in the shaft support portion 55b as shown in FIGS. And a sliding shaft 55a extending from the intermediate position of the roller 35 in the direction in which the driven roller 35 should be retracted (the right direction in FIG. 6). The sliding shaft 55a is configured to penetrate the U-shaped shape of the swing frame 50 from the inside to the outside, and a coil spring 57 is inserted into the slide shaft 55a so that the inside of the swing frame 50 is inside. A spring force is applied to the shaft support portion 55b. Accordingly, the driven roller holder 55 can move forward and backward with respect to the driving roller 33, and the peripheral surface of the driven roller 35 is always in pressure contact with the peripheral surface of the driving roller 33 by the coil spring 57.
[0044]
Subsequently, the bent portion 50c forming one end side of the swing frame 50 is formed with a gear portion 51 having a continuous uneven shape as shown in FIG. A frame member (not shown) is provided with a gear 77 that meshes with the gear portion 51 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, and as shown in FIGS. 8A and 8B. The swing frame 50 swings.
[0045]
Here, since the driven roller 35 is pivotally supported by a driven roller holder 55 attached to the swing frame 50, when the swing frame 50 swings around the drive roller 33 as the swing shaft, as shown in FIG. The driven roller 35 is displaced around the drive roller 33 (planetary rotation). That is, the driven roller 35 is displaced at a position where it is pressed against the driving roller 33 by the swing of the swing frame 50, and the direction in which the roll paper P is fed out (the direction indicated by the tangent line T in FIG. 8) is changed by the displacement. Thus, it is possible to adjust the degree of curling of the roll paper P.
[0046]
It should be noted that the operation lever 75 in this embodiment is in a state shown in FIG. 8B by a snap fit means (not shown), that is, a tangent line T (roll paper at the contact point between the peripheral surface of the driving roller 33 and the peripheral surface of the driven roller 35). The state in which P is extended) is the vertical state and the state shown in FIG. 8A, that is, the tangent line T is inclined 25.0 degrees from the vertical state (the tangent line T is from the upper rear of the device to the lower front of the device (FIG. 8). Between the upper left side and the lower right side) and an intermediate state between these two states, that is, a state inclined by 12.5 deg.
[0047]
By the way, the drive roller 33 is constituted by a shaft body long in the width direction of the roll paper P as described above. FIG. 11A shows the 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 long shaft in the width direction of the roll paper P. 33a has a high friction layer 34a formed by adhering wear-resistant particles (for example, ceramic particles) to the outer periphery of an adhesive 33, and a roll paper P is pressed against the high friction layer 34 by a driven roller 35. The paper P is configured to be reliably conveyed without slipping. However, the present invention is not limited to this configuration, for example, as shown in FIG. 11B, that is, the rubber roller 34b is disposed on the shaft body 33a that is long in the width direction of the roll paper P, and the rubber roller 34b extends along the circumferential direction. The roll paper P can be transported by pressing the roll paper P with a plurality of (two in FIG. 11B) driven rollers 35 arranged in the manner described above. In this case, since the drive roller 33 can be configured by a rubber roller, the cost of the drive roller 33 can be reduced.
[0048]
Next, the configuration of the auxiliary roller 47 will be described in detail. As described with reference to FIG. 4, the auxiliary roller 47 is disposed in the vicinity of the downstream side of the pinching roller 37 and at a position where it can contact the roll paper P fed out from the pinching roller 37. Further, as shown in FIG. 5, a plurality (six in this embodiment) of auxiliary rollers 47 are attached in the axial direction of the shaft body 47 a that is long in the width direction of the roll paper P.
[0049]
The auxiliary roller 47 is configured to rotate in the direction in which the roll paper P travels (clockwise in FIG. 4) in order to correctly guide the roll paper P fed from the pressure roller 37 to the downstream side. That is, the leading edge of the roll paper P abuts on the peripheral surface of the auxiliary roller 47, curves and advances downstream, so that the angle of entry to the auxiliary roller 47 is a steep angle (for example, a state as shown in FIG. 8B). ), The leading edge of the roll paper P proceeds in a direction (rear of the apparatus) opposite to the direction in which the roll paper P should originally travel (rear of the apparatus), and there is a possibility that a paper jam occurs. Therefore, in order to prevent this, the auxiliary roller 47 is rotationally driven in the direction in which the roll paper P advances, thereby reliably guiding the leading edge of the roll paper P in the correct direction.
[0050]
Here, the rotational speed of the auxiliary roller 47 in this embodiment, more specifically, the peripheral speed V _{B of the} outer periphery of the auxiliary roller 47 is set to be larger than the peripheral speed V _A of the pinching roller 37. . That is, since the paper feeding speed by the auxiliary roller 47 is set to be larger than the paper feeding speed by the nipping roller 37, the leading edge of the roll paper P can be guided more reliably in the correct direction. ing. Here, in the present embodiment, it is configured so as to surely obtain the above-described operation and effect by setting V _B = 2V _A. However, if V _B ≧ V _A is set, It is possible to obtain the effect obtained.
If the outer peripheral surface of the auxiliary roller 47 is formed of an elastic material (a rubber material in the present embodiment), the above-described effects can be obtained at a low cost.
[0051]
Further, the guide function of the leading edge of the roll paper P by the auxiliary roller 47 as described above can also be realized by the configuration as shown in FIG. In FIG. 12, an abutting rod 48 and a gear 49 are arranged on the rear side of the auxiliary roller 47. Concavities and convexities are formed on the upper surface of the abutting rod 48. Therefore, when the gear 49 is rotated counterclockwise in FIG. 12 by the rack mechanism, the abutting rod 48 faces the roll paper P as shown in FIG. Then, when the gear 49 is rotated in the clockwise direction of FIG. 12, it retracts from the roll paper P as shown in FIG. Therefore, when the leading end of the roll paper P abuts against the auxiliary roller 47 as shown in FIG. 12A, if the butting rod 48 is abutted from the back surface of the leading end portion of the roll paper P, the state shown in FIG. It is possible to correctly flow the leading edge of the roll paper P downstream.
[0052]
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 a driving roller 33 that is rotationally driven, a circumferential surface that is in contact with the circumferential surface of the driving roller 33 in a pressed state, and a position that is in pressure contact with the driving roller 33. Since the driven roller 35 is arranged so as to be displaceable, the roll paper P is moved to the auxiliary roller 47 by operating the operating lever 75 (see FIG. 5 or 8) to displace the driven roller 35. The angle to go to can be changed freely. In other words, 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., more appropriate curl correction Can be performed.
[0053]
In particular, when the degree of curl correction is strong, a phenomenon occurs in which the roll paper P bends in the opposite direction to the initial curl (hereinafter referred to as “over-decal”). When the over decal is generated at the leading end portion of the roll paper P, the leading end of the roll paper P comes into contact with the recording head 21 to contaminate the printing surface, or is correctly nipped by the first paper discharge roller 26 or the second paper discharge roller 27. There is a risk of paper jam. Therefore, if the driven roller 35 is displaced in accordance with the quality of the roll paper P and the degree of curling correction is adjusted, such a problem can be prevented.
[0054]
Next, in the position of the driven roller 35 (the state shown in FIG. 8B) where the nipping roller 37 draws the roll paper P vertically downward, the roll paper P fed from the nipping roller 37 and the auxiliary roller The angle formed with the roll paper P that has passed through 47 is configured to form a substantially right angle when the conveyance path is viewed from the side (see FIG. 4). Accordingly, the roll paper P changes its advancing direction at a steep angle, whereby a curved state with a small curvature is formed on the roll paper P, so that the roll paper P is thick enough to realize photographic image quality at the position of the driven roller 35. Even if it is like a coated paper, it becomes possible to correct the curl surely.
[0055]
In the present embodiment, the nip between the driving roller 33 and the driven roller 35 at the position of the driven roller 35 (the state shown in FIG. 8B) where the pressure roller 37 feeds the roll paper P vertically downward. Since the path length from the point to the contact with the outer peripheral surface of the auxiliary roller 47 is set to 8 mm or less, the curved state formed on the roll paper P is thereby further strengthened, and the curl is surely corrected. It is like.
[0056]
Subsequently, the curl correction apparatus 2 according to the present embodiment is configured to correct the curl at the leading end portion of the roll paper P more gently than the curl at the leading end portion or later. More specifically, the circumferential speed V _A1 of the nipping roller 37 when the leading end portion of the roll paper P passes through the auxiliary roller 47 and the peripheral speed V _A1 of the nipping roller 37 after the leading end portion of the roll paper P passes through the auxiliary roller 47. The speed is set to be larger than V _A2 .
[0057]
That is, the problem with over-decal is that the tip of the roll paper P that has been over-decal is caught in the middle of the paper path or rubs against the recording head 21. Therefore, the over-decal only at the tip of the roll paper P is reduced or eliminated. If so, it is possible to perform a normal printing operation and obtain a normal print quality even if the over-decal after the leading edge of the roll paper P is remarkable to some extent. From this point of view, in the present embodiment, the above-described means is used to correct the curl at the leading end of the roll paper P more gently than the curl at the leading end of the roll paper P. In view of the strong curl at the winding start portion of R, the curvature of the curve forming portion is reduced by setting the interval between the pinching roller 37 and the auxiliary roller 47 small in order to surely correct the curl. Even in such a case, the curl is gently corrected at the leading end portion of the roll paper P, so that over-decal at the leading end portion of the roll paper P is reduced or prevented, and an appropriate printing result can be obtained. Become.
[0058]
In this embodiment, since the degree of curl correction is adjusted by adjusting the peripheral speed _VA of the pinching roller 37 as described above, a dedicated component for adjusting the degree of curl correction is provided. As a result, the cost of the curl correction device 2 is reduced. However, as described above, the means for adjusting the degree of curl correction is not limited to this. The same effect can be obtained by making the curvature R ₁ when passing through the roller 47 larger than the curvature R ₂ when passing from the leading end of the roll paper P through the auxiliary roller 47.
[0059]
More specifically, in the present embodiment, the driven roller 35 that is manually displaced is configured to be automatically displaced using power such as a motor, whereby the rush angle of the roll paper P to the auxiliary roller 47 is configured. Alternatively, the nipping roller 37 can be moved back and forth with respect to the auxiliary roller 47, and the path length between the nipping roller 37 and the auxiliary roller 47 can be changed. It can also be configured. In particular, when the roll paper P is thick, the transport load when the leading edge of the roll paper P first passes through the auxiliary roller 47 becomes large, and the peripheral speed V _A1 of the nipping roller 37 is increased. Although there is a possibility that it cannot be set sufficiently large, as described above, according to the means for adjusting the curvature R when passing through the auxiliary roller 47, even if the roll paper P is thick, the auxiliary roller 47 has a gentle curvature. Can be surely passed through, and it is possible to reduce or prevent over-decal at the leading end of the roll paper P.
[0060]
In addition, the curl correction device 2 according to the present embodiment drives and controls the nipping roller 37 before the nipping roller 37 enters a pause state in which the roll paper P is not fed (conveyed). Thus, the leading edge of the roll paper P is arranged upstream of the auxiliary roller 47 (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 period of time, curled wrinkles will remain in the curved portion by the auxiliary roller 47, so the next time printing is started. The remaining portion of the curved wrinkle is caught in the middle of the paper path to become a paper jam, or the distance from the recording head 21 becomes non-uniform and the print quality is deteriorated.
[0061]
Further, as described above, the first feeding path for feeding the roll paper P and the second feeding path for manually feeding thick paper that cannot pass through the curved feeding path substantially horizontally include: Since the curl correction device 2 intersects and merges, the roll paper P is set in the curl correction device 2, that is, the roll paper P exists in the paper path between the pinching roller 37 and the auxiliary roller 47. In this state, the second feeding path cannot be used. Therefore, the roll paper P must be removed in advance to use the second feeding path.
[0062]
Therefore, the curl correction device 2 according to the present embodiment controls the driving of the pressure roller 37 and enters the roll paper P before entering the pause state where the pressure roller 37 does not carry the roll paper P as described above. Since the leading end is disposed on the upstream side of the auxiliary roller 47 and thereby the second feeding path is opened, the roll paper P has a curved state for correcting curl over a long period of time. It is not formed, and no curl remains on the roll paper P. When the second feeding path is used next time, it is possible to perform printing immediately without requiring any special work.
[0063]
The resting state in which the nipping 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 nipping roller 37 is not refrained thereafter (until the next paper feeding operation is performed). For example, it means a state in which a series of print jobs are completed in the printer 1 and the next print job is not reserved.
[0064]
By the way, the curl correction device 2 maintains the state in which the leading end of the roll paper P is sandwiched by the pressure roller 37 when the leading end of the roll paper P is arranged on the upstream side of the auxiliary roller 47 before entering the resting state. It is configured. Therefore, when the next paper feeding operation is started, the work of passing the leading edge of the roll paper P through the pinching roller 37 is not required, and the next paper feeding operation of the roll paper P can be easily executed. It has become.
[0065]
<3. Configuration and effect of power transmission device>
Next, the configuration and operational effects of the power transmission device 80 that transmits power from the drive motor 81 to the pinching roller 37 and the auxiliary roller 47 will be described with reference to FIGS. 13 and 14 are front views of the tooth wheel train constituting 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 an operation of the planetary lever 95 (described later). It is explanatory drawing which shows.
[0066]
First, an outline of the power transmission device 80 will be described. As shown in FIG. 1, the power transmission device 80 is provided on the left side frame 8 b constituting the base of the printer 1. As shown in FIG. 13, a drive motor 81 is fixed on the front side (right side in FIG. 13) of the left side frame 8b so that the rotation shaft 81a is orthogonal to the plane formed by the side frame 8b. The side frame 8b is provided with a plurality of gears so that the disk surface is parallel to the plane formed by the side frame left 8b, and constitutes a toothed wheel train of the power transmission device 80. Then, from the pinion gear 83 attached to the rotation shaft 81a via the toothed wheel train, the shaft end of the drive roller 33 described above provided on the rear side (left side in FIG. 13) of the side frame left 8b. Power is transmitted to the attached drive roller gear 121 (see FIG. 5) and the auxiliary roller gear 119 attached to the shaft end of the auxiliary roller shaft 47a.
[0067]
Here, the power transmission device 80 includes a first power transmission path (tooth wheel train) that transmits 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 transmission. There are two power transmission paths, a second power transmission path (tooth wheel train) for transmitting power from the gear 109 in the left direction, and either one of these two power transmission paths is selectively selected. Power transmission switching means for switching is provided. FIG. 13 shows a state where the rotational power of the drive motor 81 is transmitted using the first power transmission path, and FIG. 14 shows a state where the power is transmitted using the second power transmission path. The arrows in the figure indicate the rotation directions of the respective gears. The above is the outline of the power transmission device 80.
[0068]
Hereinafter, detailed configurations of the first power transmission path, the second power transmission path, and the power transmission switching unit will be described. First, in FIG. 13, the first power transmission path is formed by transmission gears denoted by reference numerals 103, 105, 107, 115, and 117, and the power of the drive motor 81 is transmitted in that order. The transmission gear 115 transmits power to the driving roller gear 121 and the transmission gear 117 transmits power to the auxiliary roller gear 119. Further, the planetary gear 87 transmits power to the first transmission gear 103 of the tooth wheel train.
[0069]
Next, in FIG. 13, the second power transmission path is formed by transmission gears denoted by reference numerals 109, 111, 113, 115, and 117, and the power of the drive motor 81 is transmitted in that order, and finally Similar to the first power transmission path, the transmission gear 115 transmits power to the drive roller gear 121 and the transmission gear 117 transmits power to the auxiliary roller gear 119. Further, the planetary gear 87 transmits power to the first transmission gear 109 of the toothed wheel train, as in the first power transmission path.
[0070]
The planetary gear 87 is configured to always mesh with the sun gear 85 and to rotate (revolve) the planet around the sun gear 85. The sun gear 85 forms a two-stage gear with the transmission gear 101, the rotational power 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 moves (rotates).
[0071]
Here, the planetary gear 87 is pivotally supported by a planetary lever 95 which has the same rotation center as the sun gear 85 and can freely rotate independently of the sun gear 85. The planetary lever 95 has a disk shape, and a first engagement portion 95a and a second engagement portion are formed on the outer peripheral portion so as to form a sector shape by increasing the radial dimension as shown in FIGS. A joint portion 95b is formed. The second engagement portion 95b is provided on the counterclockwise direction in FIG. 13 with respect to the first engagement portion 95a, and is formed to have a smaller circumferential dimension than the first engagement portion 95a. The planetary gear 87 is attached to the first engaging portion 95a.
[0072]
As described above, when the planetary lever 95 is rotated, the planetary gear 87 is rotated around the sun gear 85, whereby the planetary gear 87 is engaged with the transmission gear 103 (first power transmission path) and transmitted. The meshing state with the gear 109 (second power transmission path) is switched. That is, the planetary lever 95 and the planetary gear 87 constitute power transmission switching means in the power transmission device 80.
[0073]
Subsequently, the position of the planetary lever 95 where the planetary gear 87 meshes with the transmission gear 103 (hereinafter referred to as “first coupling position”), and the position of the planetary lever 95 where the planetary gear 87 meshes with the transmission gear 109 ( Hereinafter, the stopper means for fixing the planetary lever 95 will be described. As shown in FIG. 15, a stopper pin 89 extending in a direction orthogonal to the side frame left 8b is provided so as to be able to advance and retreat with respect to the planetary lever 95 through the side frame left 8b.
[0074]
The stopper pin 89 is always urged in the direction of advancement to the planetary lever 95 by the urging spring 90, and in the state of advancement to the planetary lever 95, the tip end of the planetary lever 95 is shown in FIG. It is comprised so that it may be in the state which can be engaged with the 1st engaging part 95a or the 2nd engaging part 95b formed in the outer peripheral part (refer also FIG. 13 and FIG. 14). Therefore, when the stopper pin 89 is advanced with respect to the planetary lever 95, the rotation operation of the planetary lever 95 is restricted. As described above, the first engagement portion 95a and the second engagement portion 95b provided on the planetary lever 95 and the stopper pin 89 fix the planetary lever 95 at the first connection position and the second connection position. It becomes the stopper means to do.
[0075]
On the other hand, on the inner side of the left side frame 8b (right side in FIG. 15), a release lever 91 having a rotation shaft 91a parallel to the vertical direction (the front and back direction in FIG. 15) is forward from the stopper pin 89 (FIG. 15). On the lower side). The release lever 91 includes a lever portion 91c extending from the rotation shaft 91a toward the stopper pin 89, and a carriage engagement portion 91b extending from the rotation shaft 91a in the opposite direction to the lever portion 91c. The lever engaging portion 89a formed on the stopper pin 89 can be engaged. Accordingly, when the release lever 91 rotates about the rotation shaft 91 a, the lever portion 91 c moves the stopper pin 89 in the retracting direction against the urging force of the urging spring 90, and thereby the tip end portion of the stopper pin 89. Is disengaged from the planetary lever 95 so that the planetary lever 95 can freely rotate (state shown in FIG. 15B).
[0076]
Here, the advance / retreat operation of the stopper pin 89, that is, the rotation operation of the release lever 91 is configured to be performed by the carriage 23. The front side of the release lever 91 (the lower side in FIG. 15) is a reciprocating region of the carriage 23, and the carriage engaging portion 91 b extending from the rotation shaft 91 a protrudes into the reciprocating region of the carriage 23. Is formed. Therefore, when the carriage 23 moves to the left end of the reciprocating region, that is, the side frame left 8b side, the carriage 23 is released by pressing the carriage engaging portion 91b as shown in FIG. 15A to FIG. 15B. The lever 91 is rotated, whereby the stopper pin 89 is moved in the direction of retreating from the planetary lever 95.
[0077]
Next, the rotation operation of the planetary lever 95 will be described in detail. As shown in FIG. 13, the stopper pin 89 is positioned on the side wall of the first engaging portion 95a at the first coupling position, and thereby the sun gear 85 rotates in a direction to separate the planetary gear 87 from the transmission gear 103 (see FIG. 13). Even in the case of clockwise rotation in FIG. 13, the meshing state with the transmission gear 103 is maintained. When the stopper pin 89 is retracted from the state and the sun gear 85 is rotated in the clockwise direction in FIG. 13, the planetary gear 87 is separated from the transmission gear 103 and eventually meshes with the transmission gear 109. Then, when the stopper pin 89 is advanced to the planetary lever 95 in this state, the stopper pin 89 is positioned on the side wall of the second engaging portion 95b as shown in FIG. 14, thereby separating the planetary gear 87 from the transmission gear 109. Even if the sun gear 85 rotates in the direction to be rotated (counterclockwise rotation in FIG. 14), the meshing state with the transmission gear 109 is maintained.
[0078]
Hereinafter, the function and effect of the power transmission device 80 configured as described above will be described. In the power transmission device 80, the transmission ratio h ₁ when transmitting the rotational force of the drive motor 81 to the auxiliary roller gear 119 and the driving roller gear 121 via the transmission gear 103 (first power transmission paths), likewise transmit The respective tooth wheel trains are configured such that the speed transmission ratio h ₂ when transmitting via the gear 109 (second power transmission path) is h ₁ = 4h ₂ . That is, when the transmission gear 109 (second power transmission path) is used, the auxiliary roller gear 119 and the drive roller gear 121 can be rotationally driven with lower torque.
[0079]
This is due to the following reasons. That is, as described above, the curl wrinkle correction device 2 passes the auxiliary roller 47 through the auxiliary roller 47 in order to correct the curl at the leading end of the roll paper P more gently than the curl at the leading end. The circumferential speed V _A1 of the pressure roller 37 when set is set to be larger than the circumferential speed V _A2 of the pressure roller 37 when the roll paper P leading end portion passes through the auxiliary roller 47. Here, since the roll paper P must be curved when the leading edge of the roll paper P passes through the auxiliary roller 47, the conveyance load increases compared to when the leading edge portion of the roll paper P passes through the auxiliary roller 47. However, when the roll paper P is a particularly thick photographic paper, the peripheral speed V _A1 may not be set sufficiently large.
[0080]
Therefore, the power transmission device 80 according to the present embodiment transmits power via the transmission gear 109 (second power transmission path) when the leading end portion of the roll paper P passes, thereby causing the pinching roller 37 to move. In addition to being surely driven to rotate, optimal power transmission can be performed by transmitting power via the transmission gear 103 (first power transmission path) when the portion after the leading end of the roll paper P passes. Yes.
[0081]
By the way, the power transmission switching means in the power transmission device 80 has an unconnected position where the planetary gear 87 is not coupled to either the transmission gear 103 (first power transmission path) or the transmission gear 109 (second power transmission path). I have. FIG. 16C shows the unconnected position. As described above, the stopper pin 89 engages the side wall of the first engagement portion 95a far from the second engagement portion 95b, thereby fixing the planetary lever 95 at the first connection position (FIG. 16A). )), And the planetary lever 95 is fixed to the second coupling position by engaging the side wall of the second engagement portion 95b far from the first engagement portion 95a (state of FIG. 16B). However, if the timing of the forward / backward movement of the stopper pin 89 and the rotation of the planetary lever 95 is adjusted, the stopper pin 89 can be disposed between the first engagement portion 95a and the second engagement portion 95b. . By doing so, the planetary gear 87 can maintain a state where it does not mesh with either the transmission gear 103 or the transmission gear 109, and the power transmission device 80 forms a state where no load is applied to the drive motor 81. can do.
[0082]
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 applies a large load to the drive motor 81. For example, this 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, since the power transmission device 80 can form a no-load state as described above, it is possible to prevent the above-described problems.
[0083]
Next, hereinafter, the paper feed speed of the roll paper P by the pinching roller 37 (V _A : the peripheral speed of the pinching roller 37) and the paper feed speed of the roll paper P by the paper feed roller 19 (see FIG. 2) ( The relationship with V _C : peripheral speed of the paper feed roller 19 will be described.
In FIG. 2, the nipping roller 37 and the paper feed roller 19 are both rotationally driven rollers, and the roll paper P is precisely fed by receiving a paper feed operation by these two rollers. Accordingly, the roll paper P is precisely fed under the recording head 21 by the cooperative action of these rollers, and the paper feeding operation by the nipping roller 37 and the paper feeding operation by the paper feeding roller 19 are synchronized. This is important for obtaining appropriate printing results.
[0084]
Therefore, in the printer 1, the paper feeding speed by the nipping roller 37 (the circumferential speed V _A of the nipping roller 37) is larger than the paper feeding speed by the paper feeding roller 19 (the circumferential speed V _C of the paper feeding roller 19). It is set to be. Hereinafter, the circumferential speed V _A of the nipping rollers 37, will be described effects obtained by the large becomes like than the circumferential velocity V _C of the paper feed roller 19.
[0085]
An auxiliary roller 47 is disposed in the vicinity of the downstream side of the nipping roller 37, and the roll paper P abuts on the auxiliary roller 47 and curves to advance downstream. Accordingly, the auxiliary roller 47 serves as a conveyance load generation unit that generates a conveyance load on the pinching roller 37. If there is such a conveyance load generation unit, the roll paper P slips at the pinching roller 37 or the pressure roller 37 A situation occurs in which 37 does not rotate a predetermined amount. Then, it becomes impossible to synchronize with the paper feed roller 19 located downstream of the auxiliary roller 47, and as a result, the precision feeding operation of the roll paper P by the paper feed roller 19 is adversely affected, and there is a possibility that the print quality is deteriorated. is there.
[0086]
Therefore, in the printer 1, as described above, the circumferential load V _A of the pressure roller 37 is made larger than the circumferential velocity V _B of the paper feed roller 19, so that the conveyance load generated by the presence of the auxiliary roller 47 can be reduced. The paper feeding operation by the nipping roller 37, which is slightly larger than the paper feeding roller 19, is canceled out. Therefore, an appropriate print quality can be obtained without affecting the precision feeding operation of the roll paper P by the paper feed roller 19. 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.
[0087]
Meanwhile, the paper by the peripheral when the velocity V _A becomes larger than the circumferential velocity V _C of the paper feed roller 19, resulting in an auxiliary roller 47 roll paper P proceeds weight paper feed roller 19 proceeds downstream from the nipping rollers 37 It may be greater than the feed amount. 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 deflection becomes a size that cannot be ignored particularly when printing is continuously performed on one roll of roll R, and may cause a paper jam in the middle of the paper path.
[0088]
Therefore, in the printer 1 according to the present embodiment, guide means for regulating the deflection 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, paper guide rear lower 71, paper guide front upper 73, paper guide front lower 74, and paper feed driven roller holder 18 constitute the guide means, and the auxiliary roller 47 changes to the paper feed roller 19. The facing roll paper P is guided on the front and back surfaces by the guide means, and the bending is regulated.
[0089]
Accordingly, there is no risk 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 the paper may be jammed due to the warp. The feeding operation can be executed. In this case, the flexure restricted by the guide means is released by extra roll paper P being fed from the paper feed roller 19 to the downstream side exclusively through a slip phenomenon in the paper feed roller 19. Therefore, it is desirable that the difference between the advance amount of the roll paper that proceeds downstream from the auxiliary roller 47 and the paper feed amount by the paper feed roller 19 is a difference that can maintain the print quality in the recording head 21 at a certain level or higher. .
[0090]
In addition, the guide means is not provided to restrict the bending of the roll paper P as in this embodiment, but the paper jam occurs due to the bending of the roll paper P in the middle of the paper path from the auxiliary roller 47 to the paper feeding roller 19. You may provide the bending space which can be absorbed safely, without making it. In this case, the bend generated in the roll paper P hardly affects the precision feeding operation by the paper feeding roller 19, so that it is possible to obtain a higher quality printing result.
[0091]
In this embodiment, the nipping roller 37 described above is a “first conveying roller”, the paper feed roller 19 is a “second conveying roller”, and the auxiliary roller 47 is a “conveying load generation unit”. The above-described effects can be obtained without being limited to the curl correction device 2 in particular. That is, by providing a load on the “first transport roller” that sandwiches and transports the transport medium and the transport medium that is provided near the downstream of the first transport roller and that is fed from the first transport roller. A “conveying load generating unit” that generates a conveying load on the first conveying roller, and a “second conveying roller” that is provided downstream of the conveying load generating unit and pinches a conveying medium and precisely feeds downstream. In the “conveying medium feeding device” comprising: the conveying medium feeding speed by the first conveying roller is set to be larger than the conveying medium feeding speed by the second conveying roller, The conveyance load generated by the conveyance load generation unit and the conveyance medium feeding operation by the first conveyance roller, which is slightly larger than the second conveyance roller, cancel each other out. Without affecting the feeding operation, it is possible to perform a proper conveying operation.
[0092]
【The invention's effect】
As described above, according to the present invention, the nipping roller that nipping and transporting the roll paper and the downstream side of the nipping roller are arranged to bend the roll paper in the opposite direction with respect to the curl. In the roll paper curl correction device for correcting curl of the roll paper unwound from the roll paper roll wound in a roll, the curving roller is driven to rotate. And a driven roller having a peripheral surface in contact with the peripheral surface of the drive roller in a pressed state and disposed so as to be displaceable at a position in pressure contact with the drive roller. Accordingly, by displacing the driven roller, the angle at which the roll paper advances to the curve forming portion can be freely changed, and thereby the curvature at the time of decurling can be freely changed. If the driven roller is displaced according to the paper quality, usage environment, etc., over-decal can be reduced or prevented.
[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 block diagram of a control system of the ink jet printer according to the present invention.
FIG. 4 is a side cross-sectional view of the curl correction apparatus according to the present invention.
FIG. 5 is an external perspective view of a swing frame.
FIG. 6 is a side view of the 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 a curl correction apparatus according to the present invention.
FIG. 10 is a side sectional view of a curl correction apparatus according to the present invention.
FIG. 11 is a perspective view showing another embodiment of the pinching roller of the curl correcting apparatus according to the present invention.
FIG. 12 is a side cross-sectional view showing another embodiment of the auxiliary roller of the curl correction apparatus according to the present invention.
FIG. 13 is a front view of a tooth wheel train of the power transmission device.
FIG. 14 is a front view of a tooth wheel train of the power transmission device.
FIG. 15 is an explanatory diagram showing the operation of the lock pin.
FIG. 16 is an explanatory view showing the operation of the planetary lever.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inkjet printer 2 Roll paper curl correction device 5 Paper feed device 8 Frame 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 discharge Paper roller 27 Second paper discharge roller 37 Nipping roller 47 Auxiliary roller 50 Oscillating frame 63 Roll paper detector 80 Power transmission device 85 Sun gear 87 Planetary gear 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 (2)

A roll paper supply device that pivotally supports a roll paper roll wound in a roll shape so that the outer peripheral surface becomes a printing surface;
A roll paper curl correcting device that corrects the curl of the roll paper unwound from the roll paper roll by a bending means that curves the roll paper in a direction opposite to the curl;
A paper feed roller provided downstream of the roll paper curl correction device;
A recording head provided on the printing surface side of the roll paper downstream of the paper feed roller;
A platen provided facing the recording head downstream of the paper feed roller;
A recording apparatus comprising: a discharge roller that discharges the roll paper that has been printed downstream of the recording head;
The roll paper curl correction device comprises a correction amount adjusting means for adjusting the degree of curl correction,
The correction amount adjusting means makes the degree of curl correction to the roll paper moderate only when correcting the curl at the tip of the roll paper ,
A bending roller that sandwiches and conveys the roll paper;
It is arranged in the vicinity of the downstream side of the pressure roller and in contact with the roll paper fed out from the pressure roller. By changing the direction of movement of the roll paper, a curved state is formed in the roll paper, and An auxiliary roller that guides the roll paper downstream by moving, and
The peripheral speed V _B of the auxiliary roller outer periphery is set to be greater than the peripheral speed V _A of the pinching roller outer periphery ,
A recording apparatus. 2. The correction amount adjusting unit according to claim 1, wherein the correction amount adjusting means sets a speed V _{A1 at} which the leading end portion of the roll paper passes through the bending means to be greater than a speed V _{A2 at} which the leading end portion of the roll paper passes through the bending means. Accordingly, the recording apparatus is configured to correct the curl at the leading end of the roll paper more gently than the curl at the leading end of the roll paper.

Images