JP2013086442A - Recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording apparatus capable of correcting skew of a recording medium without damage thereon when unwinding the recording medium wound in a roll state.SOLUTION: For winding on a rolled recording medium, winding is performed through two sets of conveying roller pairs. The conveying speed of the conveying roller pairs on a side close to the rolled recording medium is set slower than the conveying roller pairs on a side far from the rolled recording medium.

Description

  The present invention relates to a recording apparatus including a roller speed control mechanism for a conveyance roller that conveys a recording medium.

  Patent Document 1 discloses a loop control device that feeds out a long plate material wound in a roll shape, forms a loop, and winds it up. This apparatus is related to loop control of a slitter line of a plate material, and automatically corrects the speed of the winding roll by detecting the loop shape so that the plate material is not obstructed by a tensile force or a compression force.

JP-A-1-127116

  In a recording apparatus, a recording medium wound in a roll shape is usually cut and discharged by a cutter after recording is completed, and an unrecorded area of the recording medium is usually sent back and rewound onto a roll. Further, when feeding the recording medium wound in a roll shape, a loop control unit is provided on the upstream side of the recording unit, and a skew correction mechanism provided between the loop control unit and the recording unit is used. The skew in the recording medium conveyance is corrected. If the recording medium is transported obliquely before passing through the skew correction mechanism, if the recording medium forms a loop, the loop portion is twisted. If the feed back is performed in such a state where the skew has occurred, the skew is increased between the loop portion and the winding portion due to the twist of the loop portion.

  Further, in order to correct skew, a skew correction is performed by providing a guide portion for guiding the end of the recording medium in the conveyance portion of the recording medium. However, the recording medium may be damaged by the contact of the recording medium with the guide portion.

  Accordingly, the present invention has been made on the basis of recognition of the above problems, and a recording apparatus capable of correcting skew feeding without damaging the recording medium when the recording medium wound in a roll shape is rewound. The purpose is to provide.

  Therefore, the recording apparatus of the present invention includes a transport unit that pulls and transports a recording medium wound in a roll shape from the roll by the first roller pair and the second roller pair, and a recording medium transported by the transport unit. When the recording unit for recording and the recording medium are transported in the direction opposite to the transporting direction during recording and wound on the roll, the recording medium is transported through the first roller pair after the second roller pair. And a winding control unit that performs winding control of the recording medium, and a guide member that corrects skew of the recording medium between the first roller pair and the second roller pair. In the apparatus, when the winding control is performed, the conveyance speed of the recording medium by the first roller pair is made slower than the conveyance speed of the recording medium by the second roller pair. Roller pair and the second And forming a loop of the recording medium between the over roller pair.

  According to the present invention, in the winding control, the recording apparatus transports the recording medium by the first roller pair at a speed lower than the recording medium transportation speed by the second roller pair. A recording medium loop is formed between the first roller pair and the second roller pair. Accordingly, it is possible to provide a recording apparatus capable of correcting skew feeding without damaging the recording medium when the recording medium wound in a roll shape is rewound.

It is the schematic of the cross section of the recording device which can apply this embodiment. It is a block diagram which shows the concept of a control part. It is a figure for demonstrating the operation | movement in single-sided recording mode. It is the figure which showed the state immediately after cut | disconnecting a recording medium in a cutter part. It is a figure for demonstrating operation | movement in double-sided recording mode. (A), (b) is a figure for demonstrating the detail of a skew correction part. (A), (b) is a figure for demonstrating the detail of a recording-medium supply part. (A), (b) is the figure explaining the detail of conveyance roller pair vicinity. FIG. 10 is a diagram for explaining a case where there are a plurality of recording medium supply units.

  Hereinafter, an embodiment of a recording apparatus using an ink jet system of the present invention will be described with reference to the drawings. The recording apparatus of the present embodiment uses a long continuous recording medium (a continuous recording medium longer than the length of a repetitive recording unit (referred to as one page or unit image) in the transport direction), and simplex recording and duplex recording. It is a high-speed line printer that supports both. Such a recording apparatus is suitable, for example, for recording a large number of sheets in a recording laboratory or the like. In the present specification, even if a plurality of small images, characters, and blanks are mixed in an area of one recording unit (one page), what is included in the area is collectively referred to as one unit image. That is, the unit image means one recording unit (one page) when a plurality of pages are sequentially recorded on a continuous recording medium. The length of the unit image varies depending on the image size to be recorded. For example, the length in the recording medium conveyance direction is 135 mm for the L size photograph, and the length in the recording medium conveyance direction is 297 mm for the A4 size.

  The present invention is widely applicable to recording apparatuses such as printers, printer multi-function machines, copiers, facsimile machines, and various device manufacturing apparatuses. The recording process may be any system such as an inkjet system, an electrophotographic system, a thermal transfer system, a dot impact system, and a liquid development system. Further, the present invention is not limited to the recording process, and can also be applied to a recording medium processing apparatus that performs various processes (recording, processing, coating, irradiation, reading, inspection, etc.) on a roll recording medium.

  FIG. 1 is a schematic cross-sectional view illustrating an internal configuration of a recording apparatus to which the present embodiment can be applied. The recording apparatus of the present embodiment can perform double-side recording on the first surface of the recording medium and the second surface on the back side of the first surface using a recording medium wound in a roll shape. In the recording apparatus, the recording medium supply unit 1, the decurling unit 2, the skew feeding correction unit 3, the recording unit 4, the inspection unit 5, the cutter unit 6, the information recording unit 7, the drying unit 8, the reversing unit 9, Each unit includes a discharge conveyance unit 10, a sorter unit 11, a discharge unit 12, a humidification unit 20, and a control unit 13. The recording medium is transported along a recording medium transport path indicated by a solid line in the drawing by a transport mechanism including a roller pair and a belt, and is processed by each unit. Note that, at an arbitrary position in the recording medium conveyance path, the side close to the recording medium supply unit 1 is referred to as “upstream” and the opposite side is referred to as “downstream”.

  The recording medium supply unit 1 is a unit for holding and supplying a continuous recording medium wound in a roll shape. The recording medium supply unit 1 can store two rolls R1 and R2, and is configured to alternatively draw out and supply the recording medium. The number of rolls that can be stored is not limited to two, and one or three or more rolls may be stored.

  The decurling unit 2 is a unit that reduces curling (warping) of the recording medium supplied from the recording medium supply unit 1. In the decurling unit 2, two pinch rollers are used for one driving roller, and the recording medium is curved and passed in a direction (predetermined direction) in which the curling of the recording medium is reversed. In this way, the curl is reduced by applying the decurling force. The decurling unit 2 can adjust the decurling force.

  The skew correction unit 3 is a unit that corrects skew (inclination with respect to the original traveling direction) of the recording medium that has passed through the decurling unit 2. The skew correction unit 3 corrects skew of the recording medium by pressing the end of the recording medium on the reference side against the guide member.

  The recording unit 4 is a unit that forms an image by performing a recording process on the recording medium from above by the recording head 14 with respect to the conveyed recording medium. That is, the recording unit 4 is a processing unit that performs a predetermined recording process on the recording medium. The recording unit 4 also includes a plurality of conveyance rollers that convey the recording medium. The recording head 14 has a line type recording head in which an inkjet nozzle array is formed in a range that covers the maximum width of a recording medium expected to be used. The recording head 14 has a plurality of recording heads arranged in parallel along the transport direction. In the present embodiment, the recording apparatus has seven colors corresponding to seven colors of C (cyan), M (magenta), Y (yellow), LC (light cyan), LM (light magenta), G (gray), and K (black). It has a recording head. The number of colors and the number of recording heads are not limited to seven. As the inkjet method, a method using a heating element, a method using a piezo element, a method using an electrostatic element, a method using a MEMS element, or the like can be adopted. Each color ink is supplied from the ink tank to the recording head 14 via an ink tube. As will be described later, in the recording unit 4, the recording head 14 is movable in the direction of retreating from the recording medium. Thereby, the space | interval of the recording head 14 with respect to a recording medium is adjusted.

  The inspection unit 5 optically reads the inspection pattern or image recorded on the recording medium by the recording unit 4 using a scanner, and inspects the state of the nozzles of the recording head, the recording medium conveyance state, the image position, etc., and the image is correct. This is a unit for determining whether or not recording has been performed. The scanner has a CCD image sensor and a CMOS image sensor.

  The cutter unit 6 is a unit including a mechanical cutter that cuts a recording medium after recording into a predetermined length. The cutter unit 6 also includes a plurality of conveying rollers for sending the recording medium to the next process.

  The information recording unit 7 is a unit that records recording information (unique information) such as a serial number and date of recording in a non-recording area of the cut recording medium. Recording is performed by recording characters and codes by an inkjet method, a thermal transfer method, or the like. A sensor 23 that detects the leading edge of the cut recording medium is provided on the upstream side of the information recording unit 7 and the downstream side of the cutter unit 6. That is, the sensor 23 detects the end of the recording medium between the cutter unit 6 and the recording position of the information recording unit 7. Based on the detection timing of the sensor 23, the timing of information recording by the information recording unit 7 is controlled.

  The drying unit 8 is a unit for heating the recording medium recorded by the recording unit 4 and drying the applied ink in a short time. Inside the drying unit 8, hot air is applied at least from the lower surface side (recording surface side of the recording medium) to the recording medium passing therethrough to dry the ink application surface. The drying method is not limited to the method of applying hot air, but may be a method of irradiating the surface of the recording medium with electromagnetic waves (such as ultraviolet rays and infrared rays).

  The recording medium transport path from the recording medium supply unit 1 to the drying unit 8 is referred to as a first path. The first path has a U-turn shape between the recording unit 4 and the drying unit 8, and the cutter unit 6 is located in the middle of the U-turn shape.

  The reversing unit 9 is a unit for temporarily winding up a continuous recording medium on which front surface recording has been completed when performing double-sided recording, and reversing the front and back. The reversing unit 9 is a path (loop path) (referred to as a second path) from the drying unit 8 to the recording unit 4 through the decurling unit 2 for supplying the recording medium that has passed through the drying unit 8 to the recording unit 4 again. It is provided in the middle. The reversing unit 9 includes a winding rotary body (drum) that rotates to wind up the recording medium, and the continuous recording medium that has been recorded on the surface and is not cut is temporarily wound around the winding rotary body. It is done. When the winding is completed, the winding rotary body rotates in the reverse direction, and the recording medium that has been wound is supplied to the decurling unit 2 and sent to the recording unit 4. Since the recording medium sent to the recording unit 4 is reversed, the recording unit 4 can perform recording on the back side. More specific operation of double-sided recording will be described later.

  The discharge conveyance unit 10 is a unit for conveying the recording medium cut by the cutter unit 6 and dried by the drying unit 8 and delivering the recording medium to the sorter unit 11. The discharge conveyance unit 10 is provided in a route (referred to as a third route) different from the second route in which the reversing unit 9 is provided. In order to selectively guide the recording medium conveyed along the first path to one of the second path and the third path, a path switching mechanism having a movable flapper is provided at a branch position of the path.

  The sorter unit 11 and the discharge unit 12 are provided on the side of the recording medium supply unit 1 and at the end of the third path. The sorter unit 11 is a unit for sorting recorded recording media into groups as necessary. The sorted recording media are discharged to a discharge unit 12 including a plurality of trays. As described above, the third path passes below the recording medium supply unit 1 and has a layout in which the recording medium is discharged to the opposite side of the recording unit 4 and the drying unit 8 with the recording medium supply unit 1 interposed therebetween. .

  As described above, the recording medium supply unit 1 to the drying unit 8 are sequentially provided in the first path. The tip of the drying unit 8 is branched into a second route and a third route, the reversing unit 9 is provided in the middle of the second route, and the tip of the reversing unit 9 joins the first route. A discharge part 12 is provided at the end of the third path.

  The humidifying unit 20 is a unit for generating humidified gas (air) and supplying it between the recording head 14 of the recording unit 4 and the recording medium. Thereby, ink drying of the nozzles of the recording head 14 is suppressed. As the humidifying method of the humidifying unit 20, a vaporization method, a water spray method, a steam method, or the like is adopted. As the vaporization type, there are a moisture permeable membrane type, a dropping permeation type, a capillary type and the like in addition to the rotation type of the present embodiment. The water spray type includes an ultrasonic type, a centrifugal type, a high-pressure spray type, and a two-fluid spray type. The steam type includes a steam piping type, an electric heating type, and an electrode type. The humidifying unit 20 and the recording unit 4 are connected by a first duct 21, and the humidifying unit 20 and the drying unit 8 are further connected by a second duct 22. The drying unit 8 generates a humid and high-temperature gas when the recording medium is dried. This gas is introduced into the humidifying unit 20 through the second duct 22 and used as auxiliary energy for generating a humidified gas in the humidifying unit 20. Then, the humidified gas generated by the humidifying unit 20 is introduced into the recording unit through the first duct 21.

  The control unit 13 is a unit that controls each unit of the entire recording apparatus. The control unit 13 includes a CPU, a storage device, a controller including various control units, an external interface, and an operation unit 15 that is input and output by a user. The operation of the recording device is controlled based on a command from a host device 16 such as a controller or a host computer connected to the controller via an external interface.

  FIG. 2 is a block diagram illustrating the concept of the control unit 13. A controller (range enclosed by a broken line) included in the control unit 13 includes a CPU 201, a ROM 202, a RAM 203, an HDD 204, an image processing unit 207, an engine control unit 208, and an individual unit control unit 209. A CPU 201 (central processing unit) controls the operation of each unit of the recording apparatus in an integrated manner. The ROM 202 stores programs to be executed by the CPU 201 and fixed data necessary for various operations of the recording apparatus. The RAM 203 is used as a work area for the CPU 201, used as a temporary storage area for various received data, and stores various setting data. The HDD 204 (hard disk) can store and read a program to be executed by the CPU 201, recording data, and setting information necessary for various operations of the recording apparatus. The operation unit 15 is an input / output interface with a user, and includes an input unit such as a hard key and a touch panel, and an output unit such as a display for presenting information and a sound generator.

  A dedicated processing unit is provided for units that require high-speed data processing. The image processing unit 207 performs image processing of recording data handled by the recording apparatus. That is, the image processing unit 207 converts a color space (for example, YCbCr) of input image data into a standard RGB color space (for example, sRGB), or performs resolution conversion, image analysis, image correction, etc. Various image processing is performed as necessary. The recording data obtained by these image processes is stored in the RAM 203 or HDD 204. The engine control unit 208 performs drive control of the recording head 14 of the recording unit 4 according to the recording data based on the control command received from the CPU 201 or the like. The engine control unit 208 also controls the transport mechanism of each unit in the recording apparatus. The individual unit control unit 209 includes a recording medium supply unit 1, a decurling unit 2, a skew correction unit 3, an inspection unit 5, a cutter unit 6, an information recording unit 7, a drying unit 8, a reversing unit 9, a discharge transport unit 10, and a sorter. It is a sub-controller for controlling each unit of the unit 11, the discharge unit 12, and the humidification unit 20 individually. The individual unit control unit 209 controls the operation of each unit based on a command from the CPU 201. The external interface 205 is an interface (I / F) for connecting the controller to the host device 16 and is a local I / F or a network I / F. The above components are connected by the system bus 210.

  The host device 16 is a device serving as a supply source of image data for causing the recording device to perform recording. The host device 16 may be a general-purpose or dedicated computer, or a dedicated image device such as an image capture having an image reader unit, a digital camera, or a photo storage. When the host device 16 is a computer, an OS, application software for generating image data, and a recording device driver for the recording device are installed in a storage device included in the computer. Note that it is not essential to implement all of the above processing by software, and a part or all of the processing may be realized by hardware.

  Next, the basic operation during recording will be described. Since the recording operation differs between the single-sided recording mode and the double-sided recording mode, each will be described.

  FIG. 3 is a diagram for explaining the operation in the single-sided recording mode. FIG. 4 is a diagram showing a state immediately after the recording medium is cut by the cutter unit 6. The transport path from when the recording medium supplied from the recording medium supply unit 1 is recorded by the recording unit 4 to the discharge unit 12 is indicated by a bold line. The recording medium supplied from the recording medium supply unit 1 and processed by the decurling unit 2 and the skew correction unit 3 is recorded on the surface (first surface) in the recording unit 4. An image having a predetermined unit length (unit image) in the transport direction is sequentially recorded on a long continuous recording medium to form a plurality of images side by side. The recorded recording medium passes through the inspection unit 5 and is cut for each unit image in the cutter unit 6. In the cut recording medium that has been cut, recording information is recorded on the back surface of the recording medium by the information recording unit 7 as necessary. The cut recording media are conveyed one by one to the drying unit 8 and dried. Thereafter, the sheet is sequentially discharged and stacked on the discharge unit 12 of the sorter unit 11 via the discharge conveyance unit 10. On the other hand, as shown in FIG. 4, the recording medium left on the recording unit 4 side by cutting the last unit image is sent back to the recording medium supply unit 1, and the recording medium is wound on the roll R1 or R2. As will be described later, at the time of feeding back, the decurling force at the decurling unit 2 is adjusted to be small, and the recording head 14 is retracted from the recording medium.

Thus, in single-sided recording, the recording medium is processed by passing through the first path and the third path, and does not pass through the second path. In summary, the following sequences (1) to (6) are executed under the control of the control unit 13 in the single-sided recording mode.
(1) A recording medium is sent out from the recording medium supply unit 1 and supplied to the recording unit 4.
(2) The recording of the unit image is repeated by the recording unit 4 on the first surface of the supplied recording medium.
(3) The cutting unit 6 repeats cutting the recording medium for each unit image recorded on the first surface.
(4) The recording medium cut for each unit image is passed through the drying unit 8 one by one.
(5) The recording medium that has passed through the drying unit 8 one by one is discharged to the discharge unit 12 through the third path.
(6) The last unit image is cut and the recording medium left on the recording unit 4 side is sent back to the recording medium supply unit 1.

  FIG. 5 is a diagram for explaining the operation in the double-sided recording mode. In the double-sided recording, the back surface (second surface) recording sequence is executed after the front surface (first surface) recording sequence. In the first front surface recording sequence, the operation in each unit from the recording medium supply unit 1 to the inspection unit 5 is the same as the one-side recording operation described above. In double-sided recording, the cutter unit 6 does not perform a cutting operation, and is conveyed to the drying unit 8 as a continuous recording medium. After the ink on the surface of the drying unit 8 is dried, the recording medium is guided to the path on the reversing unit 9 (second path) instead of the path on the discharge conveyance unit 10 (third path). In the second path, the recording medium is wound around the winding rotary body of the reversing unit 9 that rotates in the forward direction (counterclockwise direction in the drawing). When all the scheduled recording on the surface is completed in the recording unit 4, the rear end of the recording area of the continuous recording medium is cut by the cutter unit 6. With reference to the cutting position, the continuous recording medium on the downstream side in the conveying direction (recorded side) is wound up to the recording medium rear end (cutting position) by the reversing unit 9 through the drying unit 8. On the other hand, at the same time as the winding by the reversing unit 9, the continuous recording medium left on the upstream side in the transport direction (on the recording unit 4) with respect to the cutting position does not leave the recording medium tip (cutting position) in the decurling unit 2. As described above, the recording medium is fed back to the recording medium supply unit 1, and the recording medium is wound on the roll R1 or R2. By this back feeding (back feed), collision with the recording medium supplied again in the following back surface recording sequence is avoided. As will be described later, at the time of feeding back, the decurling force at the decurling unit 2 is adjusted to be small, and the recording head 14 is retracted from the recording medium.

  After the front surface recording sequence, the back surface recording sequence is switched. The winding rotary body of the reversing unit 9 rotates in the opposite direction (clockwise direction in the drawing) to that during winding. The end of the wound recording medium (the trailing end of the recording medium at the time of winding becomes the leading end of the recording medium at the time of feeding) is fed into the decurling unit 2 along the path of the broken line in the figure. In the decurling unit 2, the curl imparted by the winding rotary member is corrected. That is, the decurling unit 2 is provided between the recording medium supply unit 1 and the recording unit 4 in the first path and between the reversing unit 9 and the recording unit 4 in the second path, and functions as a decal in any path. It has become a common unit. The recording medium in which the front and back sides of the recording medium are reversed is sent to the recording unit 4 through the skew correction unit 3 and recording is performed on the back surface of the recording medium. The recorded recording medium passes through the inspection unit 5 and is cut into predetermined unit lengths set in advance in the cutter unit 6. Since the cut recording medium is recorded on both sides, recording by the information recording unit 7 is not performed. The cut recording media are conveyed one by one to the drying unit 8, and sequentially discharged and stacked on the discharge unit 12 of the sorter unit 11 via the discharge transfer unit 10.

As described above, in double-sided recording, the recording medium passes through the first path, the second path, the first path, and the third path in this order. In summary, in the double-sided recording mode, the following sequences (1) to (11) are executed under the control of the control unit 13.
(1) A recording medium is sent out from the recording medium supply unit 1 and supplied to the recording unit 4.
(2) The recording of the unit image is repeated by the recording unit 4 on the first surface of the supplied recording medium.
(3) The recording medium recorded on the first surface is passed through the drying unit 8.
(4) The recording medium that has passed through the drying unit 8 is guided to the second path, and is wound on the winding rotary member of the reversing unit 9.
(5) After repeated recording on the first surface, the recording medium is cut by the cutter unit 6 behind the last recorded unit image.
(6) The end of the cut recording medium passes through the drying unit 8 and is wound on the winding rotary body until reaching the winding rotary body, and the recording medium cut and left on the recording unit 4 side is recorded. It is sent back to the medium supply unit 1.
(7) When the winding is completed, the winding rotating body is rotated in the reverse direction, and the recording medium is supplied again to the recording unit 4 from the second path.
(8) The recording of the unit image is repeated by the recording unit 4 on the second surface of the recording medium supplied from the second path.
(9) The cutting unit 6 repeats cutting the recording medium for each unit image recorded on the second surface.
(10) The recording medium cut for each unit image is passed through the drying unit 8 one by one.
(11) The recording medium that has passed through the drying unit 8 one by one is discharged to the discharge unit 12 through the third path.

  6A and 6B are diagrams for explaining the details of the skew correction unit 3. FIG. 6A is a cross-sectional view showing the skew correction portion 3, and FIG. 6B is a top view of the skew correction portion 3. A loop of the recording medium is formed in the loop forming unit 63 by the conveyance roller pair 61 and the conveyance roller pair 62. The loop forming unit 63 includes a sensor 64 that detects the maximum amount of the loop and a sensor 65 that detects the minimum amount, and a pair of conveying rollers 61 and 62 so that a desired loop amount is maintained even during conveyance of the recording medium. Thus, the conveyance speed is controlled. A skew correction mechanism 66 is disposed downstream of the loop forming unit 63 to correct skew of the conveyed recording medium. At this time, the skew correction mechanism 66 corrects the skew, and the loop forming unit 63 is twisted like the recording medium (solid line) 67 and the recording medium (dotted line) 68 shown in FIG. .

  FIGS. 7A and 7B are diagrams for explaining the details of the recording medium supply unit 1. FIG. 7A is a cross-sectional view of the recording medium supply unit 1 and shows a state when the recording medium is rewound while being tensioned. FIG. 7B is a cross-sectional view of the recording medium supply unit 1 and shows a state when the tension is gradually loosened and rewound. 8A and 8B are diagrams illustrating details of the vicinity of the conveyance roller pair 72. FIG. FIG. 8A is a cross-sectional view, and FIG. 8B is a top view. When the recording medium once sent by conveyance is rewound onto the recording medium unit 71 wound in a roll shape, the recording medium is conveyed by the conveyance roller pair 72 and the conveyance roller pair 73, and a special conveyance roller is controlled. Otherwise, tension is applied in the transport path 74. In the rewinding after the recording is completed, when the recording medium is conveyed while being tensioned between the loop forming unit 63 and the recording medium supplying unit 1, the recording medium is supplied from the loop forming unit 63 due to the twist generated in the loop forming unit 63. The skew increases between the portions 1.

  A guide member 91 that guides the edge of the side of the recording medium is disposed in the vicinity of the downstream side of the conveying roller pair 72 (see FIG. 8). If rewinding after recording is finished while applying tension in a state where the skew is large, the skewed recording medium strongly comes into contact with the guide member 91, and the recording medium in the contacted portion is damaged. Will occur. Even if the guide member 91 abuts, since the tension is strong, the skew of the recording medium is not corrected, and the uncorrected amount is unwound as a scratch on the recording medium.

  Therefore, in this embodiment, the configuration shown in FIG. 7B is employed to prevent the skew amount from increasing. That is, the conveyance speed of the conveyance roller pair 72 (first conveyance roller) is made slower than the conveyance speed of the conveyance roller pair 73 (second conveyance roller), and the tension applied to the recording medium in the conveyance path 74 is relaxed. Control. By controlling in this way, the degree of freedom increases in the movement of the recording medium between the conveyance roller pair 73 and the conveyance roller pair 72, and even if the recording medium abuts on the guide member 91, the recording medium moves accordingly. be able to. Therefore, the recording medium to be taken up does not come into strong contact with the guide member 91, and the recording medium is not damaged. At the same time, it goes without saying that the recording medium in contact with the guide member 91 at the time of winding moves to correct skew.

  Thus, when winding on a roll-shaped recording medium, winding is performed via two pairs of conveyance rollers, and the conveyance speed of the conveyance roller pair on the side close to the roll-shaped recording medium is set to the roll-shaped recording medium. It is set to be slower than the conveyance speed of the conveyance roller pair on the side far from the recording medium. A recording medium guide portion is provided between the two pairs of conveying rollers. As a result, a recording apparatus capable of correcting skew feeding without damaging the recording medium when the recording medium wound in a roll shape is rewound can be realized.

(Other embodiments)
Hereinafter, other embodiments of the present invention will be described with reference to the drawings. Since the basic configuration of the present embodiment is the same as that of the above-described embodiment, only the characteristic configuration will be described below.

  In the above-described embodiment, the case where there is one recording medium supply unit 1 has been described. In the present embodiment, a case where there are a plurality of recording medium supply units 1 will be described.

  FIG. 9 is a diagram for explaining a case where a plurality of recording medium supply units are provided. There are four recording medium supply units 81, 82, 83, 84 wound in a roll shape, and a pair of conveying rollers 811, 821, 831, 841 is provided for each. The conveyance roller pair 85 is disposed on the downstream side of the joining portion of the conveyance paths 812, 822, 832, and 842. The conveyance distance between the conveyance roller pair 85 and the conveyance roller pairs 811, 821, 831, 841 in order to correct the skew caused by the twist generated in the loop forming unit 63 during the rewinding and reduce the damage to the recording medium. Accordingly, the speed of the conveying roller pair 811, 821, 831, 841 is changed. Specifically, control is performed so that the speed of the transport roller pairs 811, 821, 831, and 841 decreases as the transport distance between the transport roller pairs increases. In other words, when the transport distance is long, the amount of loop sag is increased according to the distance, and when the distance is short, the amount of loop sag is decreased according to the distance, and the amount of loop sag according to the distance is reduced. Form. As a result, an optimum loop is formed when the recording medium supply unit is rewound. With such a configuration, it is possible to realize a recording apparatus capable of correcting skew feeding without damaging the recording medium when the recording medium wound in a roll shape is rewound.

DESCRIPTION OF SYMBOLS 1 Recording medium supply part 3 Skew correction part 6 Cutter part 13 Control part 63 Loop formation part 72 Conveyance roller pair 73 Conveyance roller pair 91 Guide member

Claims (2)

A transport unit that pulls out and transports the recording medium wound in a roll shape by the first roller pair and the second roller pair;
A recording unit for recording on a recording medium conveyed by the conveyance unit;
When the recording medium is conveyed in the direction opposite to the conveying direction during recording and wound on the roll, the recording medium conveyed through the first roller pair is wound after the second roller pair. A take-up control unit for performing control, and
A guide member for correcting skew of the recording medium between the first roller pair and the second roller pair;
In a recording apparatus comprising:
In the winding control, the recording medium conveyance speed by the first roller pair is made slower than the recording medium conveyance speed by the second roller pair. And a second roller pair to form a loop of the recording medium.   A plurality of the first roller pairs are provided, and the conveyance speed of the recording medium by each of the first roller pairs is long in the conveyance path of the recording medium from the second roller pair to the first roller pair. The recording apparatus according to claim 1, wherein the recording apparatus has a slower speed.

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