JP5791417B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus that performs recording on a roll-shaped recording medium.

  Some recording apparatuses can record an image or the like on a recording medium having a large size of A2 or larger. In this recording apparatus, roll paper (hereinafter, a roll portion around which the roll paper is wound is referred to as a “roll portion” and a portion pulled out from the roll portion is referred to as a “paper portion”) is used as a recording medium. There are many cases. Currently, the paper portion is pulled out from the roll portion by a conveying roller. However, since the roll paper used in such a recording apparatus is wound in a roll shape, the roll paper is heavier than the cut paper, and the load applied to the transport roller when the paper portion is pulled out from the roll portion is large. It has become a thing. Therefore, there is a possibility that the roll unit does not rotate and the roll paper breaks only with the driving force of the carry motor that drives the carry roller. In view of this, a recording apparatus has been developed in which a roll motor for rotating the roll unit is provided and the paper unit is pulled out from the roll unit while driving the roll motor together with the transport motor.

  As this type of recording apparatus, for example, the one disclosed in Patent Document 1 is known. This recording apparatus controls the drive of at least one of the roll motor or the conveyance motor based on the measurement result of the conveyance roller, the roll motor, the conveyance motor, the tension measuring means for measuring the tension generated on the roll paper, and the tension measurement result. A motor control unit that intermittently conveys the roll paper. In this configuration, the motor is feedback-controlled based on the tension accurately measured by the tension measuring means, and the transport amount of the roll paper is determined. Therefore, the tension acting on the roll paper can be controlled appropriately, and the roll paper can be controlled. It is possible to prevent fluctuations in tension due to changes in the winding diameter.

  As a recording apparatus having a configuration different from this, a recording apparatus disclosed in Patent Document 2 is known. This recording apparatus rotates a feeding roller, a feeding motor, a feeding roller arranged at a position capable of contacting the outer peripheral surface of the roll portion of the roll paper, a feeding motor, and a feeding roller during a stop time of the feeding roller. And a control unit. The carry motor rotates the carry roller, and the feed motor rotates the feed roller. In this configuration, the roll paper is fed out from the roll portion of the roll paper by an amount corresponding to the carry amount by the carry operation of the carry roller between the end of the carry operation of the paper portion by the carry roller and the start of the next carry operation. Rotate in the direction. As a result, the paper part always has a slack when transported by the transport roller, and the paper part is not affected by the tension when the paper part is transported by the transport roller. Can be improved.

JP 2009-263044 A JP 2007-203564 A

  However, in Patent Document 1, since the tension is always applied to the paper portion, the paper portion slides on the transport roller due to this tension, and the actual transport amount may be smaller than the transport amount commanded by the control unit. There is a risk of affecting transport accuracy.

  In Patent Document 2, since the tension is not applied to the paper portion, it is possible to prevent the actual transport amount from becoming less than the transport amount instructed by the control unit, which is a problem in Patent Document 1. On the other hand, there may be a case where skew (skew) occurs in the conveyed paper portion due to a shift in the roll paper setting position (position where the roll portion is held). In general, by rotating the roll unit in the direction to wind up the paper unit and applying tension to the paper unit, the skew of the paper unit is corrected by the conveyance force and tension for conveying the paper unit. And generation of wrinkles is prevented. However, in the configuration of Patent Document 2, since the paper portion is slack and no tension is applied, there is a problem that when the paper portion is skewed, it is difficult to correct the skew.

  The present invention has been made in view of the above problems, and provides a recording medium conveyance method and a recording apparatus capable of suppressing a decrease in conveyance accuracy of a recording medium and correcting skew.

Recording equipment controls the recording unit to the recording medium output from the paper feeding unit for holding the rolled recording medium to perform recording on a recording medium using a recording head which scans in the width direction of the recording medium . In this recording apparatus, skew of the recording medium conveyed to the recording unit is generated by the transport rollers provided between the recording unit and the paper feeding unit, when the skew amount of that is smaller than the predetermined value, the recording medium When the conveying roller is driven so that the first tension is applied to the recording medium and the skew amount is larger than a predetermined value, the conveying roller is driven so that the second tension larger than the first tension is applied to the recording medium. .

  According to the present invention, it is possible to correct the skew of the recording medium while suppressing a decrease in the conveyance accuracy of the recording medium.

1 is a schematic perspective view of an embodiment of a recording apparatus according to the present invention. It is a schematic side view of the recording apparatus shown in FIG. It is a schematic block diagram of a spool unit. It is a schematic block diagram of a tension | tensile_strength provision mechanism. It is a schematic block diagram of a conveyance roller drive mechanism. It is the block diagram which showed the control part. It is the schematic which shows the conveyance state of a paper part. It is the figure which showed the relationship in speed, the amount of slack, tension | tensile_strength, electric current, and time in the control mode 1. FIG. It is the figure which showed the relationship in speed, the amount of slack, tension | tensile_strength, electric current, and time in the control mode 2. FIG. It is a top view which shows a mode that the paper part skewed. It is a figure which shows the relationship between skewing amount and control mode. 3 is a flowchart showing a flow of a recording operation in the first embodiment. It is a figure which shows the relationship between speed, the amount of slack, tension | tensile_strength, electric current, and time of the control mode 1 and control mode 2 in 2nd Embodiment. 10 is a flowchart illustrating a flow of a recording operation according to a third embodiment. 10 is a flowchart illustrating a flow of a recording operation in the fourth embodiment.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the same number is attached | subjected to the structure which has the same function in an accompanying drawing, and the description may be abbreviate | omitted.

[Embodiment 1]
FIG. 1 is a schematic perspective view of an embodiment of a recording apparatus according to the present invention. FIG. 2 is a schematic side view of the recording apparatus shown in FIG. In FIGS. 1 and 2, a part of the outer frame is omitted for easy understanding of the internal structure of the recording apparatus.

  The recording apparatus 1 of the present invention includes a paper feed unit in which roll paper 6 as a recording medium is disposed, a recording unit that records on the roll paper 6 on the downstream side of the paper feed unit in the transport direction of the roll paper 6, A paper discharge unit that discharges the roll paper 6 recorded by the recording unit is provided downstream of the recording unit.

  A roll paper 6 wound in a roll shape is fixed to the paper supply unit by a spool shaft 5. A portion of the roll paper 6 wound in a roll shape is referred to as a “roll portion 6a”, and a portion of the roll paper 6 that is pulled out from the roll portion 6a is referred to as a “paper portion 6b”.

  The recording unit includes a recording head 2 that ejects ink and a carriage 3 on which the recording head 2 is mounted. The carriage 3 is along a carriage shaft 4 and a guide rail (not shown) in the direction D1, that is, Reciprocal scanning is possible in the width direction of the paper portion 6b. In addition, on the side surface of the carriage 3, there is a skew amount detecting means that can detect the presence or absence of the paper portion 6b and the end in the width direction of the paper portion 6b, and can detect the skew amount of the paper portion 6b. A paper edge detection sensor 13 is provided. Therefore, the width of the paper portion 6 b can be detected by the paper edge detection sensor 13 by reciprocating the carriage 3. Further, the skew amount of the paper portion 6b can be detected by conveying a predetermined amount (for example, 300 mm) and detecting the position of the end portion in the width direction of the paper portion 6b before and after the conveyance.

  A paper discharge cover 14 is provided in the paper discharge portion, and the paper portion 6b discharged from the recording portion slides on the paper discharge cover 14 and is stored in a paper discharge basket (not shown).

  Between the paper feeding unit and the recording unit, a conveyance path for guiding the paper unit 6b of the roll paper 6 conveyed from the paper feeding unit to the recording unit is formed by the outer guide 7 and the inner guide 8. On the downstream side of the conveyance path, a roller pair including a conveyance roller 10 provided with a conveyance roll gear 22 (see FIG. 5) at one end and a pinch roller 11 facing the conveyance roller 10 is provided. The paper unit 6b of the roll paper 6 conveyed from the paper supply unit is nipped by the roller pair and conveyed to the recording unit.

  The recording unit is provided with a platen 12 that supports the paper unit 6 b of the roll paper 6, and the carriage 3 on which the recording head 2 is mounted is positioned so as to face the platen 12 with a gap.

  A cutter 29 is disposed between the recording unit and the paper discharge unit, and the cutter 29 cuts the rear end of the portion of the paper unit 6b where an image or the like is recorded. The main body of the recording apparatus 1 is provided with a transport motor 24, which will be described in detail later.

  In FIG. 3, the schematic block diagram of the attachment unit of the roll paper 6 is shown. In the present invention, the roll portion 6a of the roll paper 6 is attached to the main body of the recording apparatus 1 by a spool unit 16 which is an attachment unit shown in FIG. The spool unit 16 includes a spool shaft 5, a reference side flange 26 fixed to the spool shaft 5, and a non-reference side flange 27 into which the spool shaft 5 can be inserted. The reference side flange 26 is provided with a roll gear 17 on the surface opposite to the spool shaft 5. A reference side loading portion 26 a is provided on the spool shaft 5 side of the reference side flange 26, and a non-reference side loading portion 27 a is provided on the spool shaft 5 side of the non-reference side flange 27.

  By inserting the spool shaft 5 into the hollow paper tube 15 that is the core of the roll paper 6 and pushing the reference side loading portion 26 a into the paper shaft 15, one end of the roll portion 6 a is held by the reference side flange 26. Next, the non-reference side loading portion 27a of the non-reference side flange 27 is pushed into the paper tube 15 from the other end side of the roll portion 6a, and the spool shaft 5 is passed through the non-reference side loading portion 27a, so that the roll portion 6a The other end is held by the non-reference side flange 27.

  The reference side flange 26 and the non-reference side flange 27 are rotatably held by the main body of the recording apparatus 1. Therefore, the spool shaft 5 can also rotate, and the roll part 6a can also rotate.

  FIG. 4 shows a schematic configuration diagram of the tension applying mechanism. The tension applying mechanism 40 transmits the spool unit 16 and the roll motor 19 provided in the main body of the recording apparatus 1 and the driving force of the roll motor 19 to the roll gear 17 of the spool unit 16 from the gear 19a. And a roll input gear 18. In addition, an encoder film 20 is attached to the roll input gear 18, and a rotation operation of the encoder film 20 can be detected by an encoder sensor 21.

  Since the rotational speed of the roll input gear 18 is the same as the rotational speed of the encoder film 20, the rotational speed of the encoder film 20 is detected by the encoder sensor 21. Then, drive control of the roll motor 19 is performed based on the detected data. The roll motor 19 mainly performs no-load driving, excitation driving with a predetermined force, and roll paper reverse driving. In the excitation drive with a predetermined force, the skew that occurs when the roll paper 6 is set in the paper feed unit by transporting the paper unit 6b while applying a tension (back tension) opposite to the transport direction of the paper unit 6b. Correction and sagging. The tension load is adjusted by controlling the torque generated by the roll motor 19 by adjusting the current flowing through the roll motor 19.

  FIG. 5 shows a schematic configuration diagram of the transport roller driving mechanism. The conveyance roller drive mechanism 50 transfers the conveyance roll gear 22 of the conveyance roller 10, the conveyance motor 24 provided in the main body of the recording apparatus 1, and the driving force of the conveyance motor 24 from the gear 24 a to the conveyance roll gear 22. A transfer input gear 23 for transmission. An encoder film 28 is attached to the transport input gear 23 so that the encoder sensor 25 can detect the rotational operation of the encoder film 28.

  Since the rotation speed of the conveyance input gear 23 is the same as the rotation speed of the encoder film 28, the rotation speed of the encoder film 28 is detected by the encoder sensor 25. Then, drive control of the transport motor 24 is performed based on the detected data.

  Next, a flow from when the paper portion 6b of the roll paper 6 is supplied from the paper supply portion to the recording portion and discharged to the paper discharge portion will be described. The user pulls out the paper portion 6b from the roll portion 6a of the roll paper 6 fixed to the paper feed portion. The drawn roll paper 6, that is, the paper portion 6b, is further transported by the user and is transported through a transport path formed by the outer guide 7 and the inner guide 8 and a transport roller 10 positioned at a distance from each other. Head between the pinch rollers 11. A sheet detection unit (not shown) is provided upstream of a pair of rollers including the conveyance roller 10 and the pinch roller 11. When the paper portion 6b is detected by the paper detection means, the conveying roller 10 and the pinch roller 11 that are spaced apart from each other come close to each other and sandwich the paper portion 6b. Thereafter, the paper section 6b is automatically sent out from the paper feeding section by the rotation of the transport roller 10.

  The paper portion 6 b is conveyed by a conveyance roller 10 to a platen 12 provided at a recording position facing the recording head 2. At this time, the paper edge detection sensor 13 mounted on the carriage 3 detects the width and skew amount of the paper portion 6b. The recording is performed in different control modes depending on the skew amount, which will be described later in detail.

  Then, the carriage 3 reciprocally scans along the carriage shaft 4, and recording for one line is performed on the paper unit 6 by ejecting ink from the recording head 2. Then, the paper portion 6b is conveyed by a predetermined amount, and recording for one line is performed again. By repeating the recording and conveyance for one line, predetermined recording is performed on the paper section 6b.

  When the recording is completed, the paper portion 6b is transported by the transport roller 10 until the trailing edge of the recorded portion of the paper portion 6b is located at the cutting position by the paper cutter 29, and is cut by the paper cutter 29. The The paper portion 6b having a recording portion slides on the paper discharge cover 14 and is stored in a paper discharge basket (not shown).

  FIG. 6 is a block diagram showing the control unit. The control unit 100 is a part for realizing control of the roll motor 19 and the transport motor 24 and realizing control of the tension applying mechanism 40 and the transport roller driving mechanism 50. The control unit 100 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a motor driver, and the like (not shown). The control unit 100 includes a main control unit 110, a roll motor control unit 120, and a transport motor control unit 130. The main control unit 110 gives a command to both the roll motor control unit 120 and the conveyance motor control unit 130 in order to realize correlation driving between the roll motor 19 and the conveyance motor 24. Roll motor control unit 120 has two control modes, control mode 1 and control mode 2. The skew amount of the paper portion 13 detected by the paper edge detection sensor 13 is fed back to the main control portion 110, and the control mode of the roll motor control portion 120 is switched based on the skew amount.

  The movement of the roll motor 19 is controlled by detecting the movement of the encoder film 20 attached to the roll input gear 18 with the encoder sensor 21 and feeding back the result to the roll motor control unit 120. Similarly, the movement of the conveyance motor 24 is controlled by detecting the movement of the encoder film 28 attached to the conveyance input gear 23 with the encoder sensor 25 and feeding back the detection result to the conveyance motor control unit 130.

  FIG. 7 is a schematic diagram illustrating a conveyance state of the sheet unit 6b. The tension applied to the paper section 6b between the transport roller 10 and the roll section 6a is Tpap, the transport speed of the transport roller 10 (the speed on the circumference of the cross section of the transport roller 10) is Vlf, and the paper section 6b from the roll section 6a The feed speed (speed on the circumference of the cross section of the roll portion 6a) is Vroll. Further, the amount of slack of the roll paper 6b between the transport roller 10 and the roll paper 6a is Spap, and the actual transport speed of the paper section 6b is Vpap. For Vlf, Vroll, and Vpap, the direction of the arrow in the figure, that is, the direction in which the paper portion 6b is sent out is positive. Here, since the conveyance speed of the paper section 6b is determined by the speed of the conveyance roller 10, Vpap = Vlf. As for the slack amount Spap, a state where there is no slack is defined as a slack amount 0, and the slack amount is displayed as an absolute value. The force relationships in the waveform diagrams shown below will be described based on the directions shown in FIG.

  Next, the operational relationship between the conveying roller 10 and the roll unit 6a in this embodiment will be described with reference to FIG. FIG. 8 is a diagram showing the relationship between speed, slack amount, tension, current and time in control mode 1, and FIG. 9 shows the relationship between speed, slack amount, tension, current and time in control mode 2. FIG. In each figure, (a) shows the conveyance speed Vlf of the conveyance roller 10 on the vertical axis and time T on the horizontal axis. In (b), the vertical axis represents the feeding speed Vroll of the paper portion 6b, and the horizontal axis represents time T. In (c), the vertical axis represents the slack amount Spap of the paper portion 6b, and the horizontal axis represents time T. In (d), the vertical axis represents the tension Tpap applied to the paper portion 6b, and the horizontal axis represents time T. (E) shows the current I energized to the roll motor 19 on the vertical axis and the time T on the horizontal axis. When the current I is a positive value, the roll 6a is rotated by the tension applying mechanism 40 in the direction of feeding the paper 6b (counterclockwise in FIG. 7), and when the current I is a negative value, the roll 6a is rotated. The part 6a rotates in the direction of winding the paper part 6b (clockwise in FIG. 7).

  The conveyance speed Vlf of the conveyance roller 10 has an operation waveform having three areas: an acceleration area (between time Ta and Tc), a constant speed area (between time Tc and Te), and a deceleration area (between time Te and Tf). .

Time Tb is a time point at which the feed speed Vroll of the roll section 6a becomes larger than the transport speed Vlf of the paper section 6b by the transport roller 10. Therefore, during the time period Ta−Tb, a tension generation region in which the tension Tpap is applied to the paper portion 6b is obtained. In this region (between time Ta and Tb), a positive current flows through the roll motor 19 and the roll motor 6a rotates in the counterclockwise direction (the direction in which the paper portion 6b is fed out) in FIG. 19 is operated. However, since the transport roller 10 is transporting the paper portion 6b at an acceleration higher than that, the roll portion 6a is rotated by the transport roller 10. Therefore, the slack amount Spap of the paper portion 6b does not occur, and the tension Tpap applied to the paper portion 6b occurs. Thus, in a situation where the roll paper 6a is accelerated by the transport roller 10, an inertial force is generated in the paper portion 6b in the direction opposite to the transport direction, and the tension Tpap increases. However, in the control mode 1, a predetermined current I _A in the positive direction is applied to the roll motor 19 to suppress an increase in the tension Tpap and control is performed so that the predetermined tension Tpap _A is obtained.

Note that the tension Tpap of the paper portion 6b can be changed by changing the amount of current applied to the roll motor 19. If the current is made larger than the predetermined current I _A , the roll motor 19 further accelerates in the direction of feeding the paper portion 6b from the roll portion 6a (counterclockwise direction in FIG. 7), so that the tension Tpap applied to the paper portion 6b is It becomes smaller than the predetermined tension Tpap _A. Conversely, if the current is made smaller than the predetermined current I _A , the tension Tpap becomes larger than the predetermined tension Tpap _A. In the control mode 2 shown in FIG. 9, by applying a predetermined current I _B larger than the predetermined current I _A , the tension applied to the sheet portion 6b is changed to a tension Tpap _B smaller than the tension Tpap _A at the predetermined power I _A. can do.

The subsequent description is the same in the control mode 1 shown in FIG. 8 and the control mode 2 shown in FIG. Next, if the current I energized to the roll motor 19 is increased before the time Tb, the feed speed Vroll of the paper portion 6b is increased by the transport roller 10 during the time Tb-Tc. It exceeds the conveyance speed Vlf. Therefore, the slack amount Spap> 0 and the tension Tpap = 0. In the constant speed region (time Tc-Te) and the deceleration region (time Te-Tf) after the acceleration region (time Ta-Tc) of the transport roller 10, the transport speed Vlf of the paper portion 6b by the transport roller 10 and the paper portion 6b It operates in a state (Vlf = Vroll) where the feed rate Vroll matches. Therefore, the slack amount Spap is maintained at the predetermined slack amount Spap _A (Sapp _B ) and the tension Tpap is zero. After the operation of the transport roller 10 is completed (time Tf), the roll motor 19 is rotated in the direction in which the paper portion 6b is wound up (opposite to the transport direction of the paper portion 6b: clockwise in FIG. 7). The slack removal is performed until the amount of slack of the sheet becomes Spap = 0 (time Tg). The slack removal of the paper section 6b is completed between the operation stop of the transport roller 10 (time Tf) and the start of the supply operation of the next paper section 6b (time Ta '). The above operation is performed every time the conveyance roller 10 is intermittently conveyed.

In tension generating region described above (time Ta-Tb), a predetermined tension TpapA, to generate the TPAP _B is to correct the skew occurring in the sheet portion 6b. Here, a mechanism for correcting the skew of the paper portion 6b will be described with reference to FIG. FIG. 10 is a plan view showing a state in which the paper portion is skewed, and FIG. 10A is a plan view showing a state of the transport force H and the tension Tpap when the paper portion 6b is transported in the skew state. (B) is a top view which shows the effective conveyance force F which actually acts on the paper part 6b currently conveyed in the skew state. As shown in FIG. 10A, when the sheet portion 6b is conveyed in a skewed state toward the P2 side end portion which is one side, the P1 side end portion which is the other side of the sheet portion 6b. The end on the P2 side is loosened. Therefore, the tension Tpap is strong at the P1 side end and weak at the P2 side end. The conveyance force H generated by the roller pair of the conveyance roller 10 and the pinch roller 11 is equal to the conveyance force H at the P1 side end and the P2 side end regardless of the presence or absence of skew. On the other hand, the effective transport force F actually acting on the paper portion 6b is the difference between the transport force H and the tension Tpap. Therefore, as shown in FIG. 10B, the effective conveying force F that actually acts is strong at the P2 side end and weak at the P1 side end, and the paper portion 6b is moved from the P2 side end to the P1 side end. The skew is corrected. That is, in the skew correction, the greater the tension Tpap, the greater the difference in tension between the P2 side end and the P1 side end, and the greater the skew correction effect. The tension Tpap can generate the tension Tpap most effectively because the inertial force of the sheet unit 6b itself increases in tension when the sheet roller 6b is accelerated by the conveying roller 10. is there.

  On the other hand, while the tension Tpap is working, the conveyance roller 10 is likely to slip in the paper portion 6b. Therefore, in this embodiment, in the region after the tension generation region (between time Ta and Tb) (between time Tb and Tf), the tension Tpap is not generated on the paper portion 6b, and the conveyance accuracy is maintained.

  From the above, the control mode 1 has a greater effect on the skew correction because the tension applied to the paper portion 6b is larger than that in the control mode 2 (see FIG. 8). On the other hand, since the tension applied to the paper portion 6b is smaller in the control mode 2 than in the control mode 1, the conveyance with the conveyance accuracy is possible (see FIG. 9).

  In this embodiment, a positive current is applied to the roll motor 19. However, in some cases, a negative current may be added to the tension due to the inertial force to generate the tension by the roll motor 19. . Further, since the inertial force of the paper portion 6b changes depending on the state of the roll paper 6 (basis weight, width size, winding diameter), it is necessary to change the predetermined current I depending on the state of the roll paper 6.

Further, in the control mode 1 and the control mode 2, the predetermined tension Tpap is set to Tpap _A > Tpap _B , but Tpap _A = Tpap _B , and the tension generation region (time Ta−Tb) is set to the control mode 1 rather than the control mode 2. The time may be set so that is longer. As a result, the control mode 1 can correct the skew of the paper portion 6b over a longer time than the control mode 2, and thus the effect of the skew correction is increased.

  Next, with reference to FIGS. 11 and 12, the recording operation of the recording apparatus according to the present invention for switching between the control mode 1 and the control mode 2 in accordance with the skew amount detected by the skew amount detecting means will be described. To do. FIG. 11 is a diagram showing the relationship between the skew amount and the control mode. FIG. 12 is a flowchart showing the procedure of the recording operation in the present embodiment. The control operation of the present embodiment is defined as “first control”.

  As shown in FIG. 11, as a result of detecting the skew amount of the paper portion 6b by the paper edge detection sensor 13 which is a skew detection means, the skew amount is equal to or smaller than ob1 which is a predetermined reference value. In this case, control mode 2 is used. Control mode 1 is used when the amount of skew is greater than ob1 and less than or equal to ob2, which is a predetermined upper limit value greater than ob1. This is because the tension is adjusted so that the effect of the skew correction becomes control mode 1> control mode 2.

  In addition, if the skew amount is larger than ob2, a message is displayed on the operation panel (not shown) that the user again sets the roll paper 6 in the paper feeding unit. In the control mode 1, there is a limit to the effect of the skew correction in the recording operation. For this reason, in the case of a large skew amount that may cause streaks in an image recorded by skew feeding even when the control mode 1 is used, it is necessary to reset the roll paper 6. Instruct to reset.

  Next, a specific recording operation procedure will be described with reference to FIG. When the recording operation starts and the roll paper 6 starts to be fed (S01), the paper part 6b is conveyed by a predetermined amount (for example, 300 mm), and the end position of the paper part 6b before and after the conveyance is set to the paper. The amount of skew is detected by the end detection sensor 13 (S02). It is determined whether the skew amount is equal to or less than ob1 (S03). If the skew amount is equal to or less than ob1, recording is performed in the control mode 2 (S04). If the skew amount is larger than ob1, it is determined whether the skew amount is equal to or less than ob2 (S05). If the skew amount is greater than ob1 and less than or equal to ob2, recording is performed in control mode 1 (S06). If the skew amount is larger than ob2, the user reloads the roll paper 6 and feeds it again (S07). Recording in each control mode is performed (S04, S06). When recording of one image is completed (S08), it is determined whether recording of the next image is performed (S09). When the next image is recorded, the process returns to the paper feeding step (S01), and thereafter the same steps as described above are performed. That is, in this embodiment, the skew amount is determined once for one image.

  As described above, if the skew amount of the paper portion 6b at the time of the first image recording is greater than ob1 and less than or equal to ob2, the paper portion 6b is transported in the control mode 1 where the effect of skew correction is great. . For this reason, it is possible to correct the skew earlier. If the skew is corrected in the recording operation in the control mode 1 and the skew amount of the paper portion 6b is equal to or less than ob1, the control mode 2 is used for transporting the paper portion 6b after the next image recording. Further, it is possible to transport the paper portion 6b with a small transport amount error caused by the tension Tpap. Conversely, even if some external force is applied to the paper portion 6b during the conveyance of the paper portion 6b in the control mode 2 and the skew amount increases (greater than ob1 and less than or equal to ob2), in the recording operation of the next image, the skew feeding is performed. It is possible to carry the paper section 6b in the control mode 1 where the correction effect is large. Therefore, skew correction can be performed while suppressing a decrease in conveyance accuracy.

[Embodiment 2]
Next, a second embodiment of the recording apparatus according to the invention will be described with reference to the drawings. Unlike the first embodiment, this embodiment is characterized in that a constant tension is continuously applied to the paper portion 6b. In addition, about the same structure as 1st Embodiment, the same code | symbol is used and the description is abbreviate | omitted.

FIG. 13 is a diagram illustrating the relationship between speed, amount of slack, tension, current, and time in the control mode 1 and the control mode 2 in the present embodiment. The vertical axis and horizontal axis of the graph in FIG. 13 are the same as FIG. 8 showing the control mode 1 and FIG. 9 showing the control mode 2 in the first embodiment, respectively. In the control mode 1 and the control mode 2 shown in FIG. 13, the slack amount Spap of the paper portion 6b is always set to substantially zero during the conveyance of the paper portion 6b. By applying this control mode, it is possible to apply the tension Tpap to the paper portion 6b for a long time, and the effect of skew correction is increased. Also in this embodiment, the current I supplied to the roll motor 19 is controlled according to the skew amount of the paper portion 6b, and the tension Tpap is adjusted. For example, since a tension Tpap greater than that in the control mode 2 is applied in the control mode 1, an offset of ΔI is generated between the current I ′ in the control mode 1 indicated by a broken line and the current I ″ in the control mode 2 indicated by a solid line. Is provided. Therefore, the tension Tpap _C in the control mode 1> the tension Tpap _{D in the} control mode 2.

  Note that the control mode of the second embodiment may be the control mode 1, and the control mode of the first embodiment may be the control mode 2. As a result, the time during which the tension is applied to the sheet portion 6b is longer in the control mode 1, and therefore the effect of the skew correction is greater in the control mode 1 even if the tension Tpap is the same.

  As described above, also in the present embodiment, since the tension applied to the paper portion 6b is larger in the control mode 1 than in the control mode 2, the effect of the skew correction is great. Further, since the tension applied to the paper portion 6b is small in the control mode 2, compared to the control mode 1, the paper roller 6b is less likely to slip when the paper roller 6b is transported by the transport roller 10 and the paper portion 6b has a small transport amount error. Transport is possible. Therefore, by switching the control mode according to the skew amount of the paper portion 6b, it is possible to correct skew while suppressing a decrease in the conveyance accuracy of the paper portion 6b.

[Embodiment 3]
Next, a third embodiment of the recording apparatus according to the invention will be described with reference to the drawings. In addition, about the same structure as the above-mentioned embodiment, the same code | symbol is used and the description is abbreviate | omitted.

  This embodiment is different from the first embodiment in the flow of recording operation. FIG. 14 is a flowchart showing the procedure of the recording operation in the present embodiment. The control operation of this embodiment is defined as “second control”.

  When the recording operation is started and the feeding of the roll paper 6 is started (S11), the paper portion 6b is conveyed by a predetermined amount, and the edge position of the paper portion 6b before and after the conveyance is detected by the paper edge detection sensor 13. By detecting this, the skew amount is detected (S12). At this time, the number n of detections is set to 1 (S13). It is determined whether the skew amount is ob1 or less (S14). If the skew amount is ob1 or less, the control mode 2 is selected (S15). If the skew amount is larger than ob1, it is determined whether the skew amount is less than ob2 (S16). If the skew amount is greater than ob1 and less than or equal to ob2, recording is performed in control mode 1 (S17). If the skew amount is larger than ob2, the roll paper 6 is set again by the user and fed again (S18).

  Once the control mode is selected (S15, S17), it is next determined whether or not the skew detection interval X (for example, X = 1200 mm) × the number of detections n is shorter than the length L of the recorded image (S19). When the skew detection interval X × the number of detections n is shorter than the length L of the recorded image, recording is performed for a length corresponding to the skew detection interval X (S20). Then, skew detection is performed again (S21). At this time, the detection count n is increased by 1 (S22). Then, the process returns to the step of determining the skew amount (S14), and thereafter the same steps as described above are performed. This is repeated until the detection interval X × the number of detections n> the length L of the recorded image. When the detection interval X × the number of detections n> the length L of the recorded image, recording is performed up to the length L of the recorded image (S23), and the recording is terminated.

  As described above, the skew detection timing is not set for each image but for each detection interval that is a predetermined distance, so that it is constant even in the case of a long image such as banner recording (for example, 10 m). The skew detection is performed for each length and the control mode is determined. Therefore, recording can always be performed in the optimal control mode. Therefore, skew correction can be performed efficiently while suppressing a decrease in the conveyance accuracy of the paper section 6b.

[Embodiment 4]
Next, a fourth embodiment of the recording apparatus according to the invention will be described with reference to the drawings. In addition, about the same structure as the above-mentioned embodiment, the same code | symbol is used and the description is abbreviate | omitted.

  This embodiment is different from the first embodiment in the flow of recording operation. FIG. 15 is a flowchart showing the procedure of the recording operation in the present embodiment. The length L of the recorded image in the image information taken from outside before recording is read (S31). It is determined whether the length L of the recorded image is shorter than a predetermined reference length Y (for example, Y = 1200 mm) (S32). When the length L of the recorded image is shorter than the reference length Y, the first control shown in the first embodiment (see FIG. 12) is performed (S33), and the length L of the recorded image is a predetermined reference length. In the case of Y or more, the second control (see FIG. 14) shown in the second embodiment is performed (S34). When recording is started (S35) and recording of one image is completed (S36), the recording operation is completed.

  As described above, since the optimum control mode can be set depending on the length of the recorded matter, skew correction can be efficiently performed while suppressing a decrease in conveyance accuracy.

DESCRIPTION OF SYMBOLS 1 Recording device 2 Recording head 6 Roll paper (recording medium)
10 transport roller 40 tensioning mechanism

Claims (7)

In a recording apparatus for controlling a recording unit that performs recording on a recording medium using a recording head that scans in the width direction of the recording medium with respect to a recording medium output from a paper feeding unit that holds a roll-shaped recording medium A method for transporting a recording medium,
Skew of the recording medium conveyed to the recording unit is generated by the transport rollers provided between the recording unit and the feeding unit, when the skew amount of that is smaller than a predetermined value, said recording medium When the conveying roller is driven so that the first tension is applied to the recording medium and the skew amount is larger than the predetermined value, the recording medium is applied with the second tension larger than the first tension. A conveyance method for driving a conveyance roller . 2. The transport method according to claim 1, wherein the transport roller is driven so that tension is not applied to the recording medium after a tension generation period in which the first or second tension is applied to the recording medium ends. The conveyance method according to claim 1 or 2, wherein when the skew feeding amount is larger than another predetermined value larger than the predetermined value, the resetting of the recording medium is notified. Wherein for one image to be recorded on the recording medium, the carried amount of skew detected once, sending transportable according to any one of claims 1 to 3 methods. Wherein every time the recording medium is conveyed by a distance determined in advance, for sensing the amount of skew, feed transportable according to any one of claims 1 4 method. The length of the image recorded on the recording medium in the conveyance direction of the recording medium is compared with a predetermined reference length, and when the length of the image is shorter than the reference length, for each image, performs detection of skew amount, when the length of the image is longer than the reference length, the time it is transported by a distance that the recording medium is predetermined, for sensing the amount of skew, claim 5 conveyance method according to. A recording apparatus that controls a recording unit that performs recording on the recording medium using a recording head that scans in the width direction of the recording medium with respect to a recording medium output from a paper feeding unit that holds a roll-shaped recording medium. There,
A tension applying mechanism for holding the recording medium held by the paper feeding unit rotatably in a direction in which the recording medium is sent out and in a direction in which the recording medium is wound;
A conveyance roller that is provided between the sheet feeding unit and the recording unit and conveys the recording medium conveyed from the sheet feeding unit to the recording unit;
A controller provided in a main body of the recording apparatus for controlling the tension applying mechanism and the transport roller;
Skew amount detecting means for detecting the skew amount of the recording medium conveyed to the recording unit,
When the skew amount detected by the skew amount detection unit is smaller than a predetermined value, the control unit drives the transport roller so that a first tension is applied to the recording medium, and the skew amount A recording apparatus that drives the transport roller so that a second tension larger than the first tension is applied to the recording medium when the skew amount detected by the detecting unit is larger than the predetermined value .

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