JP2015227231A - Take-up device, recording apparatus, and control method for take-up device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a make-up device capable of taking up high-accuracy high-quality image record by preventing loose winding or misaligned winding with inexpensive configuration.SOLUTION: A take-up device controls the take-up of the continuous sheet conveyed by rotation of a conveying roller by: attaching the top of the continuous sheet to a take-up roller; (2) taking up the sheet while generating slack of the sheet between the conveying roller and the take-up roller by making the take-up speed of the take-up roller lower than the conveying speed of the conveying roller; (3) then hoisting the sheet by making the take-up speed of the take-up roller higher than the conveying speed of the conveying roller; and (4) controlling the take-up operation so as to impart a tension to the sheet between the conveying roller and the take-up roller.

Description

  The present invention relates to a winding device, a recording device, and a control method for the winding device. In particular, the present invention particularly relates to, for example, a roll paper that is wound around a roll core and accommodated and recorded, and a winding device that winds the roll paper on which the recording has been made, a recording device including the device, and The present invention relates to a method for controlling the winding device.

  2. Description of the Related Art Conventionally, in an image recording apparatus such as a printer or plotter that records an image on a roll-shaped recording medium, the recording is performed in order to maintain the image quality by avoiding breakage of the recorded recording medium, image fouling, and the like. A winding device for winding a used recording medium is used. Particularly in recent years, there has been a demand for a winding device that supports various recording modes in which the recording speed and the amount of the recording agent are used for various recording media having a simple configuration and different paper types, basis weights, and stiffnesses. .

  Now, as a winding method employed in the winding device, generally, a swing roller type, a weight roller type, a slack winding type, and a direct winding type are exemplified.

  In the oscillating roller type, a roller (oscillating roller) capable of applying a constant (variable) tension (biasing force) to the recording medium positioned between the conveying roller and the take-up roller is disposed. According to Japanese Patent Laid-Open No. 2004-260260, a mechanism that applies this urging force to a recording medium in a constant or variable manner and a highly accurate alignment between the rollers make it possible to use various types of roll paper and various recording modes. Can handle winding.

  The weight roller type is configured to apply tension (biasing force) to the recording medium located between the conveying roller and the take-up roller as in the swing roller type. A weight roller hanging vertically is arranged using This weight roller can be formed of a resin material or a used paper tube, and can realize an inexpensive winding device.

  The slack winding method is a winding method in which a certain slack is maintained so as not to apply tension (biasing force) to the recording medium positioned between the transport roller and the take-up roller. In this method, since no tension is applied to the recording medium, a winding device that does not cause a conveyance shift in the recording medium and does not adversely affect the quality of the recorded image can be realized.

  On the other hand, in the direct winding type, winding is performed at a constant winding torque by applying a driving force of a winding motor to a winding roller via a mechanism (for example, a torque limiter) capable of torque control. In this method, a recording medium that has been rugged due to cockling generated after recording can be wound around the winding roller with a constant winding torque. In this way, since the winding is performed while suppressing the wrinkles of the recording medium, it is possible to realize a winding device capable of handling so-called blister winding in which the wrinkled recording medium is continuously wound.

  Note that Patent Document 1 also proposes a technique for suppressing curly winding and lateral displacement winding.

JP 2000-31554 A

  However, the winding device according to the conventional method has the following problems.

  The swinging roller type winding device has a mechanism for variably controlling the position and biasing force of the roller that applies tension to the medium, and a mechanism for adjusting the alignment of the transport roller, the swinging roller, and the winding roller with high accuracy. Therefore, it is impossible to realize a winding device having an inexpensive configuration.

  Further, in the weight roller type winding device, a weight roller is disposed between the conveying roller and the winding roller, and the slack of the recording medium for conveyance is detected by the weight of the weight, and the winding is performed. For this reason, a space for maintaining a slack is required between the conveyance roller and the take-up roller, and the take-up path to the take-up roller is lengthened. It will be in the state of wrapping. On the other hand, when setting a heavy weight roller so that wrinkles do not occur on the recorded recording medium, if the alignment between the transport roller and the take-up roller is deviated, the take-up path is deviated by the heavy weight roller. Winding occurs and lateral deviation occurs. Although it is an inexpensive configuration, it cannot cope with bulge winding and lateral displacement winding with respect to various recording media.

  Further, the slack winding type does not apply a tension (regulatory force) to the recording medium, so that lateral displacement and wrinkles are easily generated during winding.

  In the direct winding type winding device, winding is always performed with a strong tension so that wrinkles are not generated between the conveying roller and the winding roller. For this reason, when the alignment between the transport roller and the take-up roller is deviated, the take-up path is deviated in accordance with the deviation, and the roll continues to be taken up, thereby causing lateral displacement winding. Although this method is an effective winding method for wrinkle winding, it is difficult to cope with lateral shift winding. In response to this problem, Patent Document 1 employs a configuration in which a convex guide is pressed against a recording medium. However, a complicated mechanism that switches the pressing force and pressing position according to various paper types, widths, and recording conditions is required, and there is a concern that the recording medium may be damaged by the pressing, so that the image quality is maintained. It is difficult to wind up as it is. It is difficult to realize a high-quality winding device with such an inexpensive configuration.

  The present invention has been made in view of the above-described conventional example. A winding device, a recording device, and a control method for the winding device that can realize high-precision winding with a simple configuration and at low cost. The purpose is to provide.

  In order to achieve the above object, the winding device of the present invention has the following configuration.

  That is, a winding device that winds the sheet by attaching a leading end of a continuous sheet conveyed by the rotation of the conveying roller to the winding roller, and winding the sheet by rotating the winding roller. And taking up the sheet so that the take-up speed of the take-up roller is smaller than the take-up speed of the take-up roller and the sheet between the take-up roller and the take-up roller is slackened. After that, the conveyance speed of the conveyance roller is made larger than the winding speed of the winding roller to wind the sheet, and the tension is applied to the sheet between the conveyance roller and the winding roller. And control means for controlling the winding means.

  In another aspect of the present invention, a recording unit that records an image on the supplied sheet, a conveying unit that conveys a sheet recorded by the recording unit, and a sheet conveyed by the conveying unit. The recording apparatus includes the winding apparatus having the above-described configuration.

  According to another aspect of the present invention, there is provided a control method for a winding device for attaching a leading end portion of a continuous sheet conveyed by rotation of a conveying roller to a winding roller, and winding the sheet. A winding step of rotating the take-up roller to wind up the sheet, and the take-up speed of the take-up roller is made lower than the transport speed of the transport roller to loosen the sheet between the transport roller and the take-up roller The sheet is wound so that the sheet is wound, and then the sheet is wound with the conveying speed of the conveying roller larger than the winding speed of the winding roller, and the conveying roller and the winding roller And a control step of controlling winding in the winding step so as to apply tension to the sheet between the control method and the control method.

  Therefore, according to the present invention, at the time of the slack operation, the already wound part is unwound, and the slackened sheet has an action of returning to the direction matching the alignment of the conveying roller, thereby suppressing the lateral deviation of the sheet. Further, since the sheet is wound up after the slack is generated and the sheet is tensioned, generation of wrinkles on the sheet is suppressed.

  Accordingly, it is possible to realize sheet winding with high accuracy with an inexpensive configuration without requiring highly accurate alignment adjustment between the conveying roller and the winding roller.

1 is a perspective view illustrating a schematic configuration of an ink jet recording apparatus that is a typical embodiment of the present invention. FIG. 2 is a perspective view illustrating a configuration of a roll paper spool portion in FIG. 1. It is a top view which shows typically the structure of a roll paper conveyance mechanism. FIG. 2 is a block diagram illustrating a control configuration relating to conveyance and recording of roll paper and detection of a state of the roll paper and a roll core in the recording apparatus illustrated in FIG. 1. 6 is a flowchart illustrating a conveyance control process for conveying and winding a roll paper. FIG. 6 is a schematic diagram illustrating a side cross-section of roll paper and a recording apparatus wound up in accordance with the process of the flowchart illustrated in FIG. 5. FIG. 7 is a time chart showing details of the operation of the winding mechanism. It is a top view which shows the various states of the winding mechanism of roll paper. It is the time chart which showed in detail the winding loosening operation | movement which reversely rotates a winding motor with a winding mechanism. It is the time chart which showed in detail the principal part of the winding mechanism according to Example 2, and its winding slack operation.

  Hereinafter, preferred embodiments of the present invention will be described more specifically and in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to already demonstrated part and duplication description is abbreviate | omitted.

  In this specification, “recording” (sometimes referred to as “printing”) is not limited to the case of forming significant information such as characters and graphics, but may be significant. It also represents the case where an image, a pattern, a pattern, etc. are widely formed on a recording medium, or the medium is processed, regardless of whether it is manifested so that humans can perceive it visually. .

  In the following description, roll paper is used as the sheet, but other than that, for example, cloth, leather, plastic film, metal sheet, or the like wound in a roll shape may be used.

  FIG. 1 is a perspective view showing a schematic configuration of an ink jet recording apparatus (hereinafter referred to as a recording apparatus) provided with a roll paper feeding mechanism and a winding mechanism according to a typical embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the spool portion of the roll paper in FIG.

  In this embodiment, a roll paper R, which is a continuous paper wound in a roll shape, is used as a recording medium. As shown in the perspective view of FIG. 2, the roll paper R passes the spool shaft 32 through the paper tube (roll core) S at the winding center. The loading portion 28 of the reference-side roll paper holder 30 disposed on the spool shaft 32 is fixedly held by biting into the inner wall of the paper tube S by the elastic force in the radial direction. The reference side roll paper holder 30 is fixed so as not to rotate with respect to the spool shaft 32.

  Further, the non-reference-side roll paper holder 31 is passed through the spool shaft 32 from the opposite side of the reference-side roll paper holder 30 and set on the paper tube S so as to sandwich the roll paper R. Note that the non-reference-side roll paper holder 31 also has a loading portion 29 that is fixedly held to the paper tube S with an elastic force in the radial direction.

  As shown in FIG. 1, the roll paper R is also rotatably held by rotatably supporting both ends of the spool shaft 32 by the main body 1 of the recording apparatus.

  On the other hand, as shown in FIG. 2, a spool gear 33 for receiving a rotational force from the main body 1 of the recording apparatus is attached to the non-reference side roll paper holder 31 of the spool shaft 32.

  Further, the spool configuration provided in the winding mechanism 71 shown in FIG. 1 is basically the same as that of the paper feeding mechanism shown in FIG. However, the difference from the paper feed mechanism is that the paper tube S is set on the spool, not the roll paper R.

  As shown in FIG. 1, a roll paper R wound in a roll shape is loaded in the paper tube S in the paper feed unit, and the leading end Rp that is fed out from the roll paper R moves to the downstream side of the transport path. Sent. A reflective optical sensor (hereinafter referred to as sensor) 41 having a light emitting element (LED) and a light receiving element (photodiode) is provided in the middle of the transport path. The sensor 41 irradiates light from the light emitting element toward the roll paper R, and detects the leading end Rp of the roll paper by receiving the reflected light by the light receiving element.

  When the sensor 41 detects the leading end portion Rp of the roll paper R, the transport motor 8 rotates the transport roller 9 in the transport direction, and the transport roller pair 9 and 10 composed of the transport roller 9 and the pinch roller 10 is the leading end of the roll paper R. The portion Rp is automatically drawn into the nip portion of the conveying roller pair 9 and 10. The roll paper R is further conveyed onto the platen 19 in a state where the leading end Rp of the roll paper R is sandwiched between the nip portions of the conveyance roller pairs 9 and 10.

  As shown in FIG. 1, the main body 1 of the recording apparatus includes an image recording unit. The image recording unit 2 includes an ink jet recording head (hereinafter referred to as recording head) 11 and a platen 19 provided to face the recording head 11.

  The recording head 11 includes a plurality of nozzle rows (not shown) in the roll paper transport direction on the surface facing the recording surface, and ejects ink of different colors for each nozzle row. The recording head 11 is supplied with ink of each color from an ink tank (not shown) via an ink supply tube (not shown) to each color nozzle. The carriage 12 is supported so as to be slidable along a guide shaft 16 and a guide rail (not shown) that are fixed to the main body 1 at both ends and arranged in parallel to each other.

  An image is recorded on the roll paper R by ejecting ink from the recording head 11 while reciprocating the carriage 12 toward the roll paper R conveyed to the image recording unit. When an image is recorded by scanning one line by forward scanning or backward scanning of the carriage 12, the roll paper R is transported by a predetermined pitch in the transport direction by the pair of transport rollers 9, 10, and the carriage 12 is moved again to move to the next line. The image is recorded. By repeating this, an image for one page is recorded, and the recorded portion is conveyed onto the paper discharge guide 22. When the image recording is completed, the roll paper R is conveyed to a predetermined cutting position by the conveying roller pair 9 and 10 and is cut by the cutter 21.

  In this recording apparatus, the recorded roll paper is not cut one page at a time, but is continuously recorded, and is sequentially wound into a roll shape by a winding mechanism 71 disposed on the downstream side of the paper discharge guide 22. it can. When winding the recorded roll paper, it is necessary to fix the leading end Rp of the roll paper to the paper tube S of the take-up spool with tape or the like in advance. By doing so, while the recorded roll paper is sent to the downstream side in the transport direction by the transport roller pair 9, 10, the winding operation is performed at a predetermined timing while applying an appropriate tension. Can be wound.

  FIG. 3 is a top view schematically showing the configuration of a roll paper feeding mechanism, a transport mechanism, and a winding mechanism.

  As shown in FIG. 3, the roll paper R is transported by the drive mechanism of the transport roller pairs 9 and 10 and the drive mechanism of the spool shaft 32 that holds the roll paper. A driving force is transmitted to the spool gear 33 through the gear trains 35 to 37 by the paper feed motor 34 to apply a rotational force to the roll paper R, and the roll paper R rotates. When the paper feed motor 34 is driven in the transport direction, the roll paper R is braked by a torque limiter 39 that can restrict the transmission torque, and a constant back tension is applied to the drawn portion. By such an operation, the roll paper R can be transported in a state where the slack is not generated as much as possible. Further, by rotating the transport motor 8 and the paper feed motor 34 in the direction opposite to the transport direction of the roll paper, the roll can be rewound while applying a back tension.

  On the other hand, the driving force of the transport motor 8 is transmitted to the transport roller 9 through the transport transmission gears 55 and 56. A rotary encoder film 54 is fixed to the transport roller 9. The encoder sensor 5 reads the slits provided at equal angular intervals provided in the rotary encoder film 54 to detect the rotation amount of the transport roller 9 and generate an encoder pulse signal. With this configuration, the rotation speed and rotation amount of the transport roller 9 are controlled.

  The spool shaft 32 of the winding mechanism 71 transmits the rotational force from the winding motor 72 to the spool gear 33 through the gears 35 to 37 having the same shape used on the paper feeding mechanism side. Between the gear 36 and the gear 37, a torque limiter 39 capable of regulating the transmission torque is provided. Accordingly, in a state where the recorded roll paper R is nipped by the transport rollers 9 and 10, the winding motor 72 is rotated, and the torque limiter 39 is applied to the recorded roll paper while applying a predetermined tension while rotating. You can take it. Further, a rotary encoder film 74 provided with slits radially at equal angular intervals is attached to the spool shaft 32. The encoder sensor 73 reads the slit to detect the amount of rotation of the winding motor 72 and generate an encoder pulse signal. With such a configuration, the rotation speed and the rotation amount of the take-up spool are controlled.

  FIG. 4 is a block diagram illustrating a control configuration related to conveyance, recording, and winding of roll paper in the recording apparatus 1 in FIG.

  A control unit 101 shown in FIG. 4 is connected to a host computer (hereinafter, host) 100 via an interface (not shown), and receives recording data and control data related to recording from the host 100. The control unit 101 performs image processing such as color processing, reduction / enlargement processing, and binarization on the recording data transferred from the host 100 via the interface, and finally records the recording data developed into a dot pattern. The data is stored in the memory in the control unit 101.

  The control unit 101 receives signals from the encoder sensor 5, encoder sensor 73, and (tip detection) sensor 41, and controls the transport motor 8, paper feed motor 34, take-up motor 72, and cutter 21 as necessary. Drive. Further, the recording operation is performed by transferring the recording data or the like to the recording head 11.

  Next, in the recording apparatus configured as described above, several embodiments of the conveyance control process for winding the roll paper will be described with reference to the drawings.

  FIG. 5 is a flowchart showing a conveyance control process for winding the roll paper. FIG. 6 is a schematic diagram showing a side cross section of the roll paper and the recording apparatus wound up in accordance with the process of the flowchart shown in FIG. FIG. 7 is a time chart showing details of the operation of the winding mechanism.

  Here, the paper tube S of the winding mechanism 71 that functions as a winding roller is fixed in a state where the leading end Rp of the roll paper R that is a recording medium is wound, and the transport roller 9 and the paper that is the winding roller are fixed. A state in which a tension is applied to the roll paper positioned between the tube S is defined as a winding operation start.

  In step S <b> 1, the control unit 101 performs recording by the recording head 11 in accordance with the conveyance of the roll paper by the conveyance roller 9 from the start of the winding operation illustrated in (1) of FIG.

  In step S <b> 2, the control unit 101 instructs the winding motor 72 to take a predetermined winding speed (VF) and performs winding. In addition, the winding speed at this time is such that the speed (circumferential speed: Vr) of the radius (the outer peripheral diameter to be wound) is lower than the transport speed (V) of the transport roller 9, that is, V> Vr. To instruct. Thus, in order to perform the recording operation and the winding operation while maintaining the relationship of V> Vr, the recorded roll paper conveyed by the operation in step S2 is the conveyance roller 9 and the winding roller (paper tube S). Since slack is gradually generated between the two, a winding slack operation is performed.

  As shown in (2) winding slack operation of FIG. 6A, only the difference between the transport speed (V = Vb) of the recorded roll paper and the winding peripheral speed (Vr = Va) during the winding slack operation. The amount of slack increases constantly. At this time, the same effect can be obtained when the operation instruction to the winding motor 72 is set to stop rotation (Vr = 0).

  Here, the winding peripheral speed (Vr) for maintaining the relationship of V> Vr is set as the peripheral speed at the maximum outer diameter that the winding mechanism 71 can wind. Since the winding outer diameter changes according to the amount of roll paper wound, the peripheral speed (winding speed) at the outer diameter during winding changes. In this embodiment, since the amount of winding cannot be grasped, in order to reliably set the winding peripheral speed (V> Vr) slower than the transport speed, the peripheral speed at the maximum outer diameter that can be wound is lower than the transport speed. It is necessary to set like this.

  Next, in step S3, the control unit 101 checks whether or not a predetermined winding standby time (Tw) has been reached after starting the winding operation. If the time has not been reached, the process returns to step S2 to continue the winding loosening operation. However, if the time has been reached, the process proceeds to step S4, and the control unit 101 returns to FIG. As shown, the winding peripheral speed Vr is made faster than the transport speed V. In step S4, the control unit 101 performs the recording operation and the winding operation while maintaining the relationship of V ≦ Vr. Therefore, the operation in step S4 is a winding operation in which the recorded roll paper that has been conveyed and slackened is gradually wound.

  Operation (3) in FIG. 6B (3) During the winding operation and (3) in FIG. 6A, during the winding operation, the conveying speed (V = Vb) and the winding peripheral speed (Vr = Vc) The amount of slack is reduced by the difference between In this embodiment, in order to maintain the relationship of V ≦ Vr, the winding peripheral speed (Vr) is set as the peripheral speed at the minimum outer diameter that the winding mechanism 71 can wind. As described above, in this embodiment, the amount of winding cannot be grasped. Therefore, in order to reliably set a winding peripheral speed (V ≦ Vr) faster than the conveying speed, the minimum outside that can be wound is reversed. It is necessary to set so that the peripheral speed in diameter is faster than the transport speed.

  Further, the winding operation is performed while maintaining the relationship of V ≦ Vr. That is, as shown in (4) the winding operation in FIG. 6A and (4) the winding operation in FIG. 6B, the winding roller (paper tube S) is finished at the same time as the slack has been wound up. The recorded roll paper between the paper and the conveying roller 9 is stretched. At this time, if a certain torque or more is generated in the take-up roller, the rotation of the take-up motor 72 is blocked by the torque limiter 39.

  In step S5, the control unit 101 checks whether or not a winding operation time Td after the winding standby time Tw has elapsed. If the operation time is less than Td, the process returns to step S4 to continue the winding operation. If the operation time is equal to or greater than Td, the process proceeds to step S6. In this embodiment, after the winding operation is finished within a predetermined winding operation time Td, a constant tension is continuously applied during the remaining time Tα. 6B, the start of the winding operation is illustrated after the winding standby time Tw has elapsed, but is detected by a sensor (not shown) that directly detects the amount of slack that occurs due to the relationship of V> Vr. The winding operation may be started when the amount of slack is equal to or greater than a predetermined threshold.

  Moreover, the solid line L1, the dotted line L2, and the alternate long and short dash line L3 shown in the time variation of the amount of slack and tension shown in FIG. 6B are the time variation in the actual winding outer diameter. Here, the solid line L1 indicates the amount of slack at a winding diameter that is approximately intermediate (during winding) with respect to the outer diameter that can be wound, and the dotted line L2 is less than during winding and is approximately near the diameter of the paper tube S (small winding). The one-dot chain line L3 indicates the amount of slack in the vicinity of the maximum outer diameter (large winding) that can be wound up more than during winding. In this way, the amount of winding slack differs depending on the actual winding outer diameter, and the winding state (winding time: Tα) changes.

  Next, when the time Td elapses, it is checked in step S6 whether the roll paper is further conveyed. Here, when the roll paper is continuously conveyed, the process returns to step S2, and the winding operation is executed while maintaining the relationship of V> Vr. When the roll paper continues to be conveyed, the roll paper is taken up while gradually generating slack again, and such a series of operations is repeated until the roll paper is completely conveyed. As a result, as shown in FIGS. 6 (a) and 6 (b), a winding sequence that causes winding slack when winding the roll paper and then generates winding by finishing winding is realized. Can do.

  If it is determined in step S6 that the conveyance of the roll paper is stopped, the process proceeds to step S7, and the winding motor 72 is stopped to stop the winding operation.

  As described above, the winding mechanism of this embodiment reduces the amount of loosening and the winding loosening operation that generates slack during the operation of winding the roll paper while applying tension between the conveyance roller and the winding roller. The winding operation and the winding operation for applying tension to the roll paper are repeated.

The winding operation time at this time is the winding speed at the peripheral speed Vc at the maximum outer shape that can be wound with respect to the slack amount L generated by the difference between the winding peripheral speed Va and the conveyance speed Vb in the winding standby time Tw. It becomes more than the time which can be wound up during the period of taking-off time Td. Further, the setting of the winding operation time Td in consideration of the winding time Tα set in advance according to the recording conditions is derived from the following equation. That is,
L = VbTw−VaTw = (Vc−Vb) (Td−Tα)
Td = {(Vb−Va) Tw + (Vc−Vb) Tα} / (Vc−Vb)
It is.

  Here, the operation for carrying the continuous roll paper is described, but the roll paper is carried intermittently (pass feed), and ink is applied to the roll paper by the recording head mounted on the carriage during that time. A similar embodiment can be applied to a configuration in which recording is performed by discharging.

  FIG. 7 shows details of the operation of a winding mechanism that performs recording by intermittently conveying roll paper. In this case, as shown in FIGS. 7A and 7B, (1) in the winding operation start state, the leading end Rp of the roll paper is wound around the paper tube S that is a winding roller. The roll paper between the transporting roller 9 and the paper tube S is tensioned, and Vw = 0 and Vr = 0. Next, in the state of (2) winding slack operation, since Vw = 0 and Vr = 0, the amount of slack increases by the amount of the pass of roll paper transport.

  Next, (3) in the state during the winding operation, the winding motor 72 is rotated after the conveyance of the number of feed passes that can be set in advance. During the winding operation, the slack of the roll paper is taken up, and a tension (tension) is generated between the conveying roller 9 and the paper tube S. (4) During the winding operation, the torque limiter 39 disposed between the winding motor 72 and the paper tube S acts to cut off the rotational driving force to the paper tube S, that is, a constant torque, that is, the conveyance roller and the paper. Tension (tension) continues to be generated between the tube S and the tube S.

  As described above, in a recording apparatus that performs a recording operation that repeats intermittent conveyance by a series of winding operations in which (1) the winding operation starts and (2) the winding slack operation to (4) the winding operation is repeated. In addition, it is possible to realize a winding sequence in which slack and tension are repeated as in the above-described example.

  Next, the effect achieved by performing winding while generating a certain slack during the winding operation will be described.

  FIG. 8 is a top view showing various states of the roll paper winding mechanism.

  As shown in FIG. 8A, when the rotation axis of the transport roller 9 and the rotation axis of the paper tube S are misaligned, or when the leading end of the roll paper is fixed to the paper tube S, there is a misalignment. In this case (not shown), if the winding is continued with a constant torque, the winding deviation grows in the axial direction of the rotation axis of the paper tube S. Such winding is called so-called lateral shift winding. When the lateral displacement winding proceeds, the end of the roll paper holder (flange) 30 roll paper disposed at the end of the paper tube S continues to be pressed, and the end is wound while being crushed.

On the other hand, in this embodiment, a winding operation for generating a certain slack after the winding state is performed. As a result, the axial winding force _fr0 at the winding outer periphery in the winding state as shown in FIG. 8 (c) becomes the winding at the winding outer periphery as shown in FIG. 8 (d). The force f _r1 is reduced (relaxed). In this case, if the friction coefficient between the front and back of the roll paper being wound is constant, the roll paper is easier to move in the lateral direction when the winding force is small (f _r0 > f _r1 ). On the other hand, according to the misalignment (angle component α) of the rotation axis of the paper tube S, a force (return force) for returning the winding misalignment in the direction matching the rotation axis of the transport roller 9 is generated by the roll paper weight. .

Therefore, in the case shown in FIG. 8D where the slack is generated, the roll paper of the slack is shown in FIG. The weight (m) acts to generate a larger return force F ₁ . That is, as shown in FIGS. 8B and 8D, the winding force is loosened from the state in which the tension is applied between the conveying roller 9 and the paper tube S, and the winding force of the winding outer peripheral portion is reduced, and the return force is reduced. And roll paper can be returned in a direction that suppresses winding deviation (a direction that matches the alignment of the transport rollers).

  That is, it is possible to continue the winding operation while suppressing the lateral displacement winding by the winding operation while generating a certain slack. Thereby, the edge part of the roll paper in the horizontal direction is prevented from being damaged or wrinkled, and as a result, highly accurate winding can be realized. Since this effect varies depending on recording conditions such as basis weight, stiffness, and ink discharge amount, it is preferable to set an optimum winding standby time Tw for each conveyance speed, roll paper, and recording conditions.

  Next, the effect of winding from a relaxed state with a constant winding torque will be described.

  One is that winding is performed while maintaining a state in which the lateral displacement obtained after the occurrence of winding slack is suppressed as described above. The other is that the uneven state (wrinkles) caused by cockling of the roll paper generated after image recording depending on the recording conditions can be wound around the outer peripheral surface of the winding with a constant torque while suppressing wrinkles. is there. This effect differs depending on the basis weight and stiffness of the roll paper, and also differs depending on each recording mode according to the recording duty, the conveyance speed, etc. Therefore, if the winding operation time Td is preset according to the type of recording medium and each recording mode, good.

  In the winding mechanism of this embodiment, the winding motor may be reversed when performing the winding slack operation.

  FIG. 9 is a time chart showing in detail the winding slack operation in which the winding motor is reversely rotated by the winding mechanism.

  As shown in FIGS. 9 (a) and 9 (b), in the winding slack operation that causes the slack of the roll paper, the winding motor 72 is reversely rotated (in the loosening direction) during the winding standby time Tw and is necessary for the winding condition. The amount of slack can be obtained without being affected by the conveyance speed of the roll paper. When slack is generated by reversely rotating the winding motor 72, the reverse rotation time Tr can be set for each recording condition to be wound. Thereby, when the conveyance speed of the roll paper is slow, it is possible to prevent the influence of wrinkles that may occur before the roll paper is wound by adjusting the reverse rotation time.

  Note that a plurality of torque limiters may be used to wind the roll paper with a constant torque. In this case, by selecting an appropriate winding torque for each recording condition (media type, recording mode) and a winding operation time Td from a plurality of torque limiters, it is effective for winding corresponding to various recording conditions. A winding sequence can be constructed.

  Therefore, according to the embodiment described above, it is possible to suppress wrinkle winding due to wrinkle winding and deviation winding due to lateral deviation according to various recording conditions with an inexpensive configuration without using a highly accurate mechanism or a complicated sequence. . As a result, the recorded roll paper can be wound while maintaining high-quality recording.

  Here, a winding mechanism configured to detect the rotation amount of the paper tube S serving as a winding roller using an optical encoder with respect to the winding mechanism according to the first embodiment will be described. Accordingly, since the basic configuration of this embodiment is the same as that of the first embodiment, only the characteristic configuration of this embodiment will be described here.

  FIG. 10 is a time chart showing in detail the main part of the winding mechanism according to the second embodiment and its loosening operation.

  In this embodiment, as shown in FIG. 3, the encoder sensor 73 and the rotary encoder film 74 are arranged at a position where the rotation of the paper tube S can be detected, and the encoder sensor 73 is always in accordance with the rotation of the paper tube S. The pulse of the encoder pulse signal from can be counted. Therefore, with this configuration, it is possible to calculate the winding diameter that constantly changes according to the winding amount of the roll paper, and it is possible to detect that the winding of the slack has been completed.

  Specifically, as shown in FIG. 10 (b), when winding of the loosened portion is finished, a constant torque (tension) is generated between the conveying roller 9 and the paper tube S, and the rotation of the paper tube S is caused. It is shut off by the torque limiter 39. Here, after the rotation of the paper tube S counted by using the encoder sensor 73 is stopped or the rotation speed of the paper tube S reaches a threshold value or less, it is recognized that the winding of the roll paper is finished, and then the rotation of the winding motor 72 is performed. Can be controlled to switch to V> Vr.

Further, the amount of slack is L, the winding end time (winding operation time) is Tf, the slit detection diameter of the rotary encoder film is r, the winding diameter is R, the winding peripheral speed is Vr, and the rotation speed of the paper tube S is Ve. Then, the winding diameter R can be calculated as follows. That is,
Vr × Tf = L
Ve × Tf = Lp
Lp = (number of pulses within the winding operation time Td) × (distance per pulse)
R: r = Vr: Ve
R = r * Vr / Ve = r * L / Tf / (Lp / Tf) = rL / Lp
It is.

  Therefore, the winding diameter R which changes can be calculated by measuring and obtaining the winding end time Tf during the winding operation. Thereby, according to the winding diameter R, the winding start time can be optimally automatically set. As for the winding peripheral speed, Vr satisfying V> Vr and V ≦ Vr can be automatically set for the conveyance speed V of the roll paper. Thereby, it is possible to automatically realize the optimum winding / loosening operation, winding operation and winding operation.

  Therefore, according to the embodiment described above, like the first embodiment, it is possible to suppress wrinkle winding due to wrinkle winding and deviation winding due to lateral deviation, and each setting item according to the winding diameter. Can be obtained automatically. Accordingly, the same effects as those of the first embodiment can be obtained, and various settings can be automatically made, so that a more user-friendly winding mechanism and recording apparatus can be realized.

  In the embodiment described above, an example in which the present invention is applied to an ink jet recording apparatus has been described. However, the present invention is not limited thereto. The present invention can be widely applied to, for example, an apparatus that pulls out a continuous sheet wound in a roll shape, performs various processes (recording, processing, coating, irradiation, reading, inspection, etc.) and winds the processed sheet. Therefore, the present invention can be configured as an independent winding device.

R roll paper, S roll core, tip portion of Rp roll paper 1 recording device, 2 image recording unit, 5, 39, 73 encoder sensor,
6, 7 sensor, 8 transport motor, 9 transport roller, 11 recording head,
12 carriage, 19 platen, 20 paper feed guide, 21 cutter,
22 paper discharge guide, 32 spool shaft, 34 paper feed motor,
71 winding mechanism, 72 winding motor, 100 host computer, 101 control unit

Claims (13)

A winding device that winds the sheet by attaching the leading end of a continuous sheet that has been conveyed by the rotation of the conveying roller to a winding roller,
Winding means for winding the sheet by rotating the winding roller;
After winding the sheet so that the winding speed of the winding roller is lower than the conveying speed of the conveying roller and the sheet between the conveying roller and the winding roller is slackened, The winding means is configured to wind the sheet by making the conveying speed of the conveying roller larger than the winding speed of the winding roller, and further to apply tension to the sheet between the conveying roller and the winding roller. And a control device for controlling the winding device.   The control means, after starting the winding operation of the sheet, (1) winding and loosening operation of the sheet that causes the sheet between the conveying roller and the winding roller to be loosened, and (2) the conveying roller A sheet winding operation for winding the sheet by making the conveying speed of the sheet higher than the winding speed of the winding roller, and (3) winding for applying tension to the sheet between the conveying roller and the winding roller The winding device according to claim 1, wherein the winding device is controlled to repeat the operation. The winding means includes a winding motor,
A torque limiter that blocks rotation by the winding roller;
3. The control unit according to claim 2, wherein the control unit is configured to operate the torque limiter to perform the winding operation of applying a constant tension to the sheet between the transport roller and the winding roller. The winding device described in 1.   The control means controls the winding means to reverse the rotation of the winding motor when performing the sheet slacking operation that causes the sheet between the conveying roller and the winding roller to slack. The winding device according to claim 3, wherein the winding device is controlled.   5. The control unit according to claim 2, further comprising a control unit configured to perform control so as to wait for winding by the winding unit for a predetermined waiting time after starting the winding operation of the sheet. The winding device according to item.   The predetermined waiting time, the winding time for performing the winding operation, and the winding time for performing the winding operation are set according to the type of the sheet, the conveyance speed of the conveyance roller, and the conditions for operating the winding device. The winding device according to claim 5, wherein Measuring means for measuring the end time of the winding operation;
Detecting means for detecting the rotational speed of the winding roller;
Based on the end time of the winding operation measured by the measuring unit and the rotation speed of the winding roller detected by the detecting unit, the winding diameter of the sheet wound on the winding roller is calculated. Calculating means for
7. The apparatus according to claim 1, further comprising a setting unit that sets a start time of the winding operation and a winding speed of the winding roller according to the winding diameter calculated by the calculating unit. The winding device according to item 1.   The winding device according to any one of claims 1 to 7, wherein a conveyance speed of the conveyance roller is constant.   The winding apparatus according to claim 1, wherein the conveyance of the sheet by the conveyance roller is intermittent conveyance, and repeats conveyance at a constant speed and stop of the conveyance. Recording means for recording an image on the supplied sheet;
Conveying means for conveying a sheet recorded by the recording means;
A recording apparatus comprising the winding device according to claim 1, wherein the sheet conveyed by the conveying unit is wound.   The recording apparatus according to claim 10, further comprising supply means for supplying the sheet wound in a roll shape on a roll core.   The recording apparatus according to claim 10, wherein the recording unit includes an inkjet recording head that records an image by ejecting ink onto the sheet. A method for controlling a winding device that attaches a leading end of a continuous sheet conveyed by rotation of a conveying roller to a winding roller and winds the sheet,
A winding step of winding the sheet by rotating the winding roller;
After winding the sheet so that the winding speed of the winding roller is lower than the conveying speed of the conveying roller and the sheet between the conveying roller and the winding roller is slackened, In the winding step, the sheet is wound by setting the conveying speed of the conveying roller higher than the winding speed of the winding roller, and further, tension is applied to the sheet between the conveying roller and the winding roller. And a control process for controlling winding.

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