Recording apparatus

Abstract

To reduce a margin at a tip of a sheet when recording images on both sides of the sheet supplied from a roll.SOLUTION: A recording apparatus of the present invention includes: a first supply portion including a first support portion that supports a side of a first end portion in a width direction of a roll around which a sheet is wound and a second support portion that supports a side of a second end portion in the width direction of the roll; a first supply path for supplying the sheet from the roll supported by the first supply portion; a recording portion that records an image on the sheet supplied from the first supply path; and a control portion that executes first control for forming a recorded roll by winding the sheet on which the image is recorded by the first supply portion. The recording apparatus is characterized in that the control portion performs second control which records, by the recording portion, an image for a second surface on the sheet supplied from the recorded roll in which the side of the first end portion is supported by the second support portion and the side of the second end portion is supported by the first support portion.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a recording apparatus for recording images on both sides of a sheet supplied from a roll. [Background technology]

[0002] Patent Document 1 describes a recording device that records images on both sides of a sheet supplied from a roll. In this recording device, a sheet supplied by a feed roller is transported in a transport direction and an image is recorded on a first side. The sheet with the image recorded on the first side is transported downstream in the transport direction and stored in a storage unit. When an image is to be recorded on a second side opposite to the first side, the sheet stored in the storage unit is turned over and transported in the opposite transport direction to record an image on the second side. The sheet with the image recorded is then wound up by a winding roller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-30899 Summary of the Invention [Problem to be solved by the invention]

[0004] When storing a sheet downstream in the conveyance direction after recording an image on its first side, as in Patent Document 1, it is necessary to provide a sufficient margin at the leading edge of the sheet. This margin at the leading edge of the sheet can be several meters long, and there has been a demand to reduce it. [Means for solving the problem]

[0005] The recording device of the present invention is a recording device comprising: a first supply unit having a first support portion supporting a first end side and a second support portion supporting a second end side in the width direction of a roll on which a sheet is wound; a first supply path for supplying a sheet from the roll supported by the first supply unit; a recording unit that records an image on the sheet supplied from the first supply path; and a control unit that executes first control to record an image on a first side by the recording unit on a sheet supplied from a roll supported by the first support portion on the first end side and the second end side by the second support portion, and then wind up the sheet with the image recorded in the first supply unit to form a recorded roll, wherein the control unit executes second control to record an image on a second side by the recording unit on a sheet supplied from the recorded roll supported by the second support portion on the first end side and the second end side by the first support portion. [Effects of the Invention]

[0006] The recording apparatus of the present invention can reduce the margin at the leading edge of the sheet when recording images on both sides of the sheet fed from the roll. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a schematic diagram showing the relationship between a recording apparatus and an external device. [Figure 2] FIG. 2 is a block diagram showing the configuration of a recording device. [Figure 3] FIG. 2 is a diagram showing the configuration of a recording device and a support unit for a roll. [Figure 4] FIG. 2 is a diagram showing the main parts of the recording device that perform recording. [Figure 5] FIG. 10 is a diagram showing a double-sided recording method using two supply units. [Figure 6] FIG. 10 is a diagram showing a double-sided recording method using one supply unit. [Figure 7] FIG. 10 is a diagram showing image data for double-sided printing. [Figure 8] 10 is a flowchart showing a process for double-sided recording using one supply unit. [Figure 9]This is a screen displayed when prompting the user to load the roll R into the supply unit. [Figure 10] This is a screen displayed when asking the user whether or not to cut off the leading edge of the sheet S. [Figure 11] This is a screen displayed when prompting the user to specify a supply path and load the roll R. [Figure 12] 10 shows a flowchart for selecting double-sided printing. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of the components described in the embodiments may be changed as appropriate depending on the configuration of the device to which the invention is applied and various conditions, and the scope of the present invention is not limited to the following embodiments.

[0009] First Embodiment <Recording device> Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] The recording device will be described with reference to Figures 1 to 5. Figure 1 is a schematic diagram showing the relationship between the recording device and external devices. The external devices transfer image data to the recording device 100 via a network system 603. Examples of external devices include a personal computer 601 and a smartphone 602. The network system 603 is a communication system such as a wired system or a wireless system.

[0011] FIG. 2 is a block diagram showing the configuration of the recording apparatus 100. The recording apparatus 100 is controlled by a CPU 605, which serves as a control unit. The control unit controls a printer unit 610 that records images. The printer unit 610 includes an input / output unit 611, a transport motor 615, a supply motor 616, an encoder 617, an optical sensor 618, and a recording head 18. The input / output unit 611 has a user interface such as an LCD, LEDs, button keys, and an operation panel. The transport motor 615 drives the transport roller 14 to transport the sheet. The supply motor 616 rotates the roll R supported by the supply unit (200, 201) to supply the sheet S. The encoder 617 is used to calculate the position of the sheet supplied from the roll, and detects, for example, the amount of rotation of the transport motor 615 or the transport roller 14. The optical sensor 618 is mounted on the carriage and detects the leading and side edges of the sheet. A group of detection sensors (6, 16, 19) detects the leading edge of the sheet in the conveying path. A recording head 18 records an image on the sheet by inkjet printing. The printing method may be electrophotography or the like.

[0012] The ROM 606 stores control execution code (programs) for the recording device 100. The RAM 607 temporarily stores image data to be recorded. The NVRAM 608 is a non-volatile memory that records various data necessary for maintaining the recording device 100 and stores information about images to be recorded. The hard disk 609 stores image data to be recorded by the printer unit 610. The recording device 100 has a LAN unit 614 for connecting to external devices. The LAN unit 614 sends and receives execution commands, various settings, and image data from external devices via a network driver 613.

[0013] FIG. 3 is a diagram showing the configuration of the recording device and the roll support unit. As shown in FIG. 3(a), the recording device 100 can support a roll R at the upper supply unit 201 and the lower supply unit 200. That is, the supply unit 201 is located above the supply unit 200. The roll R is formed by winding a sheet S around a roll core. The operation panel 28 is one of the input / output units 611 that accepts various operations from the user. The user can perform various settings for the recording device 100 using various buttons and keys provided on the operation panel 28. The roll R is supported by support units (203, 204) on both sides of the supply units (200, 201) with the side where the operation panel 28 is located as the reference. The number of supply units is not limited to two, and may be one or three or more.

[0014] As shown in FIG. 3(b), a flange 205 is attached to one end R1 of the roll R, and a flange 206 is attached to the other end R2. The shaft member 202 is attached to the flanges on both sides. Therefore, the shaft member 202 is supported by a support portion 203 on the reference side and a support portion 204 on the non-reference side of the recording device 100. The shaft member 202 may pass through the roll R, or may be divided into two parts and not pass through the roll R.

[0015] Here, the surface facing outward of the roll R will be referred to as the outer surface T1, and the surface facing inward as the inner surface T2. The surface of the sheet that is recorded first will be referred to as the first surface, and the surface of the sheet that is recorded next will be referred to as the second surface. Therefore, the first surface can be either the inner surface T2 or the outer surface T1 of the roll R, or the front image or the back image. Furthermore, of the image data, the data of the front image of the deliverable will be referred to as the front data, and the data of the back image of the deliverable will be referred to as the back data.

[0016] As shown in FIG. 3( c), when the roll R is viewed from the reference side, if the sheet S is pulled out from under the roll R, an image is recorded on the outer surface T1 of the roll R. At this time, the end R1 of the roll R is supported by the support portion 203 on the reference side, and the end R2 is supported by the support portion 204 on the non-reference side. On the other hand, as shown in FIG. 3( d), when the roll R is viewed from the reference side, if the sheet S is pulled out from above the roll R, an image is recorded on the inner surface T2 of the roll R. To record on the inner surface T2, the user flips the reference side and non-reference side of the roll R. At this time, the end R2 of the roll R is supported by the support portion 203 on the reference side, and the end R1 is supported by the support portion 204 on the non-reference side. As a result, the end R2 of the roll R is supported by the support portion 203 on the reference side, and the end R1 is supported by the support portion 204 on the non-reference side.

[0017] FIG. 4 is a diagram showing the main parts of a recording device that records an image. Here, a serial recording device using a carriage 101 is described, but it may also be a line-type recording device in which the nozzle array is configured to be the width of the sheet in the X direction. It may also be a multi-function peripheral (MFP) that integrates not only a recording function but also a scanning function, a fax function, a transmission function, etc. Furthermore, it may also be an electrophotographic recording device that uses powder toner as the recording material.

[0018] The carriage 101 is equipped with an optical sensor 618 and a recording head 18 and can move back and forth in the X direction, which intersects with the Y direction. Ink is supplied to the recording head 18 from an ink tank 102. The carriage 101 is connected to a carriage belt 103 that is driven by a CR motor, and moves back and forth in the X direction along a shaft 104. The recording head 18 ejects ink onto the sheet S while being moved in the width direction of the sheet by the carriage 101, thereby recording an image.

[0019] In the serial method, the conveyance rollers 14 convey the sheet S in the Y direction to the first recording position by the recording head 18. Next, as the carriage 101 moves in the X direction, the recording head 18 ejects ink onto the sheet S. Then, when the carriage 101 moves to the end of the recording area in the width direction of the sheet S, the conveyance rollers 14 convey a certain amount of the sheet S to the next recording position by the recording head 18. The CPU 605 records an image on the sheet S by repeating the conveyance operation of the conveyance rollers 14 to convey the sheet S and the ink ejection operation of the recording head 18. Note that when the sheet S is supplied for the first time, the leading edge of the sheet S can be detected by the optical sensor 618 of the carriage 101. Alternatively, the position of the sheet S may be detected by detecting the side edges of the sheet S. The detected leading edge position of the sheet S is stored in the RAM 607 and is used for alignment during double-sided recording.

[0020] A method for recording images on both sides of a sheet will be described with reference to Figures 5 to 7. Figure 5 illustrates a double-sided recording method using two supply units. Whether an image is to be recorded on the front or back side of the sheet S, the sheet S is supplied from the first supply path 20. Figure 6 illustrates a double-sided recording method using a single supply unit. When recording images on both sides, the sheet S is supplied from the first supply path 20 for the front image, and the sheet S is supplied from the second supply path 21 for the back image. Figure 7 illustrates image data for double-sided recording. Figure 7(a) shows the image data for the case of Figure 5, and Figure 7(b) shows the image data for the case of Figure 6. Note that the supply units 200 and 201 have similar configurations, but are simplified or omitted in Figures 5 and 6. Note that when recording images on the front and back sides, the sheet may be supplied from either the first supply path or the second supply path.

[0021] First, the conveyance path of the sheet S of the recording apparatus 100 will be described with reference to FIG. 5. The supply units (200, 201) have support units (203, 204) that support the shaft member 202 of the roll R, a contact unit 7 that contacts the underside of the roll R, a guide unit 4 below the roll R, a guide unit 22 above the roll R, and a switching unit 3. The switching unit 3 switches the contact unit 7 between a state in which it contacts the roll R and a state in which it is separated from the roll R. The contact unit 7 has multiple rollers. The conveyance unit 300 has supply paths (20, 21), a conveyance roller 14, and a detection sensor 16. The first supply path 20 and the second supply path 21 converge at a confluence in the conveyance unit 300. The first supply path 20 has a guide mechanism including a guide unit 4 that supports the sheet S that has separated from the outer periphery of the roll R, and a detection sensor 6 that detects the leading edge of the sheet S. On the other hand, the second supply path 21 is located above the first supply path 20 and has a guide mechanism including a guide 22 that supports the sheet S, and a detection sensor 19 that detects the leading edge of the sheet S. A detection sensor 16 that detects the leading edge of the sheet S is located upstream of the conveying roller 14 in the conveying direction. The conveying roller 14, together with the nip roller 15, sandwiches the sheet S and conveys the sheet downstream in the conveying direction by being rotated in the direction D1 by the conveying motor 615. On the other hand, the conveying roller 14 is rotated in the direction D2 by the conveying motor 615, so that the sheet S is conveyed upstream in the opposite direction to the conveying direction. The recording unit 400 has a recording head 18, a platen 17, and an ink receiving unit 107. The cutting unit 13 is located downstream of the recording head 18 in the conveying direction and cuts the leading edge or trailing edge of the sheet S.

[0022] Here, double-sided recording using two supply units will be described in detail with reference to FIG. 5. In this method, a sheet S is supplied from the lower supply unit 200, and after recording on the first side, the sheet is wound up in the upper supply unit 201. Next, a sheet is supplied from the upper supply unit 201, and recording on the second side is performed. FIG. 7(a) shows image data for the first and second sides in this case. In double-sided recording in FIG. 5, the trailing edge of the image on the first side becomes the leading edge of the image on the second side. To wind up the sheet S, the leading edge of the sheet S is attached to the core of the supply unit 201 by the user. As shown in FIG. 5(a), the sheet S is supplied from the lower supply unit 200 to the recording unit 400 via the first supply path 20. The recording head 18 records the image on the first side on the side that will become the outer surface T1 of the roll R in the supply unit 200. The sheet S with the recorded image is transported downstream of the recording unit 400 and wound up in the upper supply unit 201. As recording progresses in the supply unit 201, a recorded roll R is formed with the first side P1, on which the image is recorded, facing the inner surface T2. After recording of the image on the first side is completed, a black line BL shown in FIG. 7(a) is recorded on the sheet S by the recording head 18 to align the second side. When recording is completed, the cutting unit 13 cuts the rear end of the sheet S, completing the winding of the sheet S.

[0023] Next, as shown in FIG. 5(b), a sheet S is supplied to the recording unit 400 via the first supply path 20 from a recorded roll R wound up in the upper supply unit 201. At this time, an image is recorded on the inner surface T2 of the roll R. The lower supply unit 200 is omitted. However, a recorded roll R may be attached to the lower supply unit 200. When the sheet S is supplied from the first supply path 20, the outer surface T1 of the roll R supported by the supply unit 201 faces the recording head 18. The recording head 18 and the recording start position for the second side are aligned based on the black line BL detected by the optical sensor 618. The distance (L1) between the black line BL and the image on the first side is the same as the distance (L1) between the detected black line BL and the image on the second side.

[0024] As shown in FIG. 5(c), the recording head 18 records an image of the second side P2 on the side of the roll R in the supply unit 201 that will become the outer surface T1. Since recording on the second side begins from the rear end of the first side, the image data on the first and second sides are inverted in the conveyance direction as shown in FIG. 7(a). Furthermore, the margins from the reference side on the first and second sides are the same distance M1. In this double-sided recording method, since the supply unit 201 is used as a take-up device, a sufficient margin is provided at the leading edge of the sheet S when recording the image on the first side.

[0025] Next, double-sided recording using one supply unit will be described in detail with reference to FIG. 6. In this method, a sheet is supplied from the lower supply unit 200, and recording is performed on the first side P1. The sheet is then wound up in the lower supply unit 200. Next, the width direction of the roll R is reversed, and a sheet is supplied from the lower supply unit 200, and recording is performed on the second side P2. FIG. 7B shows image data for the first and second sides in this case. As with the first side, the second side is recorded from the leading edge of the sheet S, so the recording start position is adjusted based on the distance from the leading edge of the sheet S. First, as shown in FIG. 6A, the sheet S is supplied from the lower supply unit 200 to the recording unit 400 via the first supply path 20. The support unit 203 supports the edge R1, and the support unit 204 supports the edge R2. Note that the sheet S may also be supplied from the upper supply unit 201 via the first supply path 20. When the detection sensor 6 detects the sheet S, the CPU 605 can determine that the sheet S is being supplied from the first supply path 20. The recording head 18 records an image of the first side P1 on the surface of the roll R in the supply unit 200 that will become the outer surface T1. The sheet S with the recorded image is transported downstream of the recording unit 400. After the recording of the image on the first side P1 is completed, the sheet S with the recorded image is wound up into the lower supply unit 200 by rotating the transport roller 14 in the direction D2 and rotating the roll R in the direction C2. Thereafter, the user reverses the width direction of the roll R and loads it into the supply unit 200. That is, the end R1 that was supported by the support portion 203 is now supported by the support portion 204, and the end R2 that was supported by the support portion 204 is now supported by the support portion 203.

[0026] Next, as shown in FIG. 6(b), a sheet S is supplied to the recording unit 400 via the supply path 21 from a recorded roll R wound in the lower supply unit 200. At this time, the recording head 18 records an image on the inner surface T2 of the roll R. When the sheet S is supplied from the supply path 21, the inner surface T2 of the roll R supported by the supply unit 200 faces the recording head 18. The leading edge of the sheet S detected by the optical sensor 618 of the carriage 101 aligns the recording head 18 with the start position for recording on the second side P2. The distance (L2) between the leading edge of the sheet S and the image on the first side becomes the same as the distance (L2) between the leading edge of the sheet S and the image on the second side. As shown in FIG. 6(c), the recording head 18 records an image for the second side on the inner surface T2 of the roll R in the supply unit 200. Because recording on the second side begins from the leading edge of the sheet S, the image data is reversed in the width direction between the first side and the second side, as shown in FIG. 7(b). The widthwise margin (M3) of the second side can be calculated by subtracting the recording width WD and the margin (M2) of the first side from the sheet width WS. In other words, the margin on the reference side of the first side is the same as the margin on the non-reference side of the second side. In this way, recording can be performed on both sides of the roll R supported by the supply unit 200. Compared to double-sided recording using two supply units, the margin required at the leading edge of the sheet S is reduced.

[0027] FIG. 8 is a flowchart for double-sided recording using one supply unit as described in FIG. 6. Screens displayed on the operation panel 28 in the flowchart are shown in FIGS. 9 to 11. FIG. 9 is a screen displayed when urging the user to load the roll R into the supply unit. FIG. 10 is a screen displayed when inquiring the user about whether or not to cut the leading edge of the sheet S. FIG. 11 is a screen displayed when urging the user to load the roll R by specifying the supply path (20, 21).

[0028] In step S100, a double-sided printing job is sent to the printing device, and the CPU 605 starts double-sided printing. The double-sided printing job includes images corresponding to multiple pages. The images of each page include front-side data that will become the front-side image and back-side data that will become the back-side image.

[0029] In step S101, the CPU 605 confirms that the roll R is loaded in the supply unit. The CPU 605 can confirm that the roll R is loaded by detecting the leading edge of the sheet S with a detection sensor. If the leading edge of the sheet S cannot be detected, the CPU 605 displays the message shown in FIG. 9 to prompt the user to load the roll R. When the user presses the button 702 and the detection sensor detects the leading edge of the sheet S, the CPU 605 determines that the user has completed the loading of the roll R and proceeds to step S102. Here, it is assumed that the roll R is loaded in the supply unit 200. The combination of the supply units (200, 201) and the supply paths (20, 21) is arbitrary.

[0030] In step S102, the CPU 605 supplies the sheet S from the roll R of the supply unit 200. The leading edge of the sheet S is supplied to a start position where recording starts. At this time, the leading edge position of the sheet S is stored in the RAM 607.

[0031] In step S103, the CPU 605 checks whether or not to cut the sheet. The CPU 605 displays the message shown in Fig. 10 to ask the user whether or not to cut the leading edge. If the user presses button 802, the CPU 605 proceeds to step S104. On the other hand, if the user presses button 803, the CPU 605 proceeds to step S105.

[0032] In step S104, the CPU 605 executes the cutting operation of the leading edge of the sheet S by the cutting unit 13. After cutting, the leading edge of the sheet S is transported to the recording start position. By cutting the leading edge of the sheet S, accurate registration for double-sided recording can be achieved.

[0033] In step S105, the CPU 605 checks whether to supply the sheet S from the first supply path 20. If the detection sensor 6 detects the sheet S, the sheet S is supplied from the first supply path 20. On the other hand, if the detection sensor 19 detects the sheet S, the sheet S is supplied from the second supply path 21.

[0034] In step S106, the CPU 605 executes a recording operation to record an image of the front side data on the first side of the sheet S. The first side at this time is the surface that becomes the outer surface T1 of the roll R in the supply unit 200. The end R1 of the roll R is supported by the support unit 203 on the reference side, and the end R2 is supported by the support unit 204 on the non-reference side. The CPU 605 stores the leading edge position of the sheet S in RAM. The recording operation is executed by alternately carrying out the conveying operation of the sheet S and the ink ejection operation. When recording on the first side is completed, the process proceeds to step S107.

[0035] In step S107, the CPU 605 executes a winding operation to wind up the recorded sheet S (FIG. 6A). The sheet S on which the image has been recorded is wound onto the roll R in the supply unit 200 so that the first side on which the image has been recorded faces the outer surface T1. In this way, a recorded roll R is formed. When the winding operation is completed, the CPU 605 displays the message shown in FIG. 11B on the operation unit 28 to prompt the user to supply the sheet S from the supply path 21. The user loads the recorded roll R into the supply unit 200 with the first end R1 and the second end R2 reversed in the width direction. After loading the roll R, the user presses button 904. When button 904 is pressed, the CPU 605 determines that the user's loading operation is complete, and proceeds to step S108.

[0036] In step S108, the CPU 605 executes a recording operation to record back side data on the second side of the sheet S. The second side in this case is the inner surface T2 of the roll R in the supply unit 200. The CPU 605 stores the leading edge position of the sheet S in the RAM 607. The recording positions in the conveying direction of the images on the first and second sides can be aligned by making the margin L2 from the leading edge of the sheet S the same. The recording operation is executed by alternately conveying the sheet S and ejecting ink. When recording on the second side is completed, the process proceeds to step S112.

[0037] On the other hand, if the answer is No in S105, the sheet S is supplied from the second supply path 21.

[0038] In step S109, the CPU 605 executes a recording operation to record an image of the back side data on the first side of the sheet S. The first side in this case is the surface that becomes the inner surface T2 of the roll R in the supply unit 200. Also, it is assumed that the end R2 of the roll R is supported by the support unit 203 on the reference side, and the end R1 is supported by the support unit 204 on the non-reference side. The CPU 605 stores the leading edge position of the sheet S in RAM. The recording operation is executed by alternately conveying the sheet S and ejecting ink. When recording on the first side is completed, the process proceeds to step S110.

[0039] In step S110, the CPU 605 executes a winding operation to wind up the recorded sheet S. The sheet S on which an image has been recorded is wound onto the roll R in the supply unit 200 so that the first side on which the image has been recorded faces the inner surface T2. In this way, a recorded roll R is formed. When the winding operation is complete, the CPU 605 displays the display shown in FIG. 11(a) on the operation unit 28 to prompt the user to supply the sheet S from the first supply path 20. The user flips the first end R1 and the second end R2 of the recorded roll R widthwise and loads it into the supply unit 200. After loading the roll R, the user presses the button 902. When the button 902 is pressed, the CPU 605 determines that the user's loading operation has been completed, and proceeds to step S111.

[0040] In step S111, the CPU 605 supplies the sheet S from the first supply path 20 and performs a recording operation to record front-side data on the second side. The second side in this case is the outer surface T1 of the roll R in the supply unit 200. The CPU 605 stores the leading edge position of the sheet S in RAM. The recording positions in the conveying direction of the images on the first and second sides can be aligned by making the margin L2 from the leading edge of the sheet S the same. The recording operation is performed by alternating between sheet conveying operations and ink ejection operations. When recording on the second side is completed, the process proceeds to step S112.

[0041] In step S112, the CPU 605 ends the double-sided printing, and at this time, cuts off the rear end of the sheet S as necessary.

[0042] In this way, when double-sided recording is performed, the margin can be reduced by carrying out supply and winding in the same supply unit.

[0043] FIG. 12 shows a flowchart for selecting double-sided printing using two supply units (FIG. 5) and double-sided printing using one supply unit (FIG. 6).

[0044] In step S200, a double-sided printing job is sent to the printing apparatus, and the CPU 605 starts double-sided printing.

[0045] In step S201, the CPU 605 determines whether the length of the image data exceeds a threshold T. The threshold T is, for example, the length that allows the recorded sheet S to be stored in a storage section such as a basket. If the threshold T is exceeded, the CPU 605 proceeds to step S202. If the threshold T is not exceeded, the CPU 605 proceeds to step S207.

[0046] In step S202, the user supplies a sheet S from a roll R attached to the lower supply section 200 via the first supply path 20, and fixes the leading end of the sheet S to a core attached to the upper supply section 201.

[0047] In step S203, the CPU 605 executes a recording operation to record front-side data on the first side of the sheet S. The first side at this time is the side that becomes the outer surface T1 of the roll R in the supply unit 200. In the upper supply unit 201, the sheet S is wound up so that the first side, on which the image is recorded, becomes the inner surface T2. In this way, a recorded roll R is formed. The recording operation is executed by alternately transporting the sheet S and ejecting ink. When recording on the first side is completed, a black line is recorded on the trailing edge side of the image.

[0048] In step S204, the CPU 605 causes the cutting unit 13 to cut the rear end of the sheet S.

[0049] In step S205, the CPU 605 supplies the sheet S from the printed roll R in the upper supply unit 201 via the first supply path 20. At this time, the user does not reverse the end of the printed roll R in the width direction.

[0050] In step S206, the CPU 605 executes a recording operation to record back-side data on the second surface of the sheet S. The second surface at this time is the outer surface T1 of the roll R in the supply unit 201. The recording operation is executed by alternately carrying out the sheet S transport operation and the ink ejection operation.

[0051] On the other hand, if the length of the image data is equal to or less than the threshold value T, the flow chart proceeds to step S207.

[0052] In step S207, the CPU 605 executes a supply operation to supply the sheet S from the roll R attached to the lower supply unit 200 via the first supply path 20. Subsequently, the CPU 605 executes a recording operation to record front-side data on the first side of the sheet S. The recording operation is executed by alternately carrying out a sheet S transport operation and an ink ejection operation.

[0053] In step S208, when the recording of the image on the first side is completed, the CPU 605 executes a winding operation to wind up the sheet S supplied from the lower supply unit 200. The sheet S on which the image has been recorded is wound onto the roll R in the supply unit 200 so that the first side on which the image has been recorded faces outward T1. In this way, the recorded roll R is formed.

[0054] In step S209, the user mounts the recorded roll R on the supply unit 200 with the first end R1 and the second end R2 inverted in the width direction.

[0055] In step S210, the CPU 605 executes a supply operation to supply the sheet S from the roll R attached to the supply unit 200 via the second supply path 21. Subsequently, the CPU 605 executes a recording operation to record back side data on the second side of the sheet S. The recording operation is executed by alternately carrying out the conveying operation of the sheet S and the ink ejection operation. When the recording of the image on the second side is completed, the flowchart proceeds to step S211.

[0056] In step S211, the CPU 605 executes a cutting operation to cut the rear end of the sheet S.

[0057] In step S212, the CPU 605 ends double-sided printing.

[0058] If the answer is No in step S201, the sheet S may be first supplied from the second supply path 21 and the back side data may be recorded on the first side, and then the sheet S may be supplied from the first supply path 20 and the front side data may be recorded on the second side, as shown in the flowchart of Fig. 8. In this way, the CPU 605 automatically switches the double-sided recording method depending on the length of the job.

[0059] As described above, when images are recorded on both sides of a sheet supplied from a roll, if the length of the job does not exceed the threshold T, the margin at the leading edge of the sheet can be reduced. [Explanation of symbols]

[0060] 20 1st supply route 21 2nd supply route 200 Supply section 400 Recording Unit 605 CPU

Claims

1. a first supply unit having a first support portion that supports a first end side of a roll around which a sheet is wound in a width direction and a second support portion that supports a second end side of the roll; a first supply path for supplying a sheet from a roll supported by the first supply section; a recording unit that records an image on the sheet supplied from the first supply path; a control unit that performs first control to record an image on a first side by the recording unit on a sheet supplied from a roll supported at the first end by the first support unit and at the second end by the second support unit, and then wind up the sheet on which the image has been recorded by the first supply unit to form a recorded roll, The control unit executes second control to record an image on a second side of the sheet supplied from the printed roll, the sheet being supported on the first end side by the second support unit and the second end side by the first support unit, in the printing unit.

2. a second supply path for supplying a sheet from a roll supported by the first supply unit; 2. The recording device according to claim 1, wherein the second supply path supplies a sheet to the recording section from the printed roll supported by the second support portion at the first end and the first support portion at the second end.

3. 2. The recording apparatus according to claim 1, wherein the first surface is an outer surface of a roll supported by the first supply unit.

4. 4. The recording apparatus according to claim 3, wherein the image recorded on the first surface is a surface image of a product.

5. 3. The recording apparatus according to claim 2, wherein the second supply path is located above the first supply path.

6. 2. The recording apparatus according to claim 1, wherein the first surface is an inner surface of a roll supported by the first supply unit.

7. 7. The recording apparatus according to claim 6, wherein the image recorded on the first side is an image of the back side of the final product.

8. 2. The recording apparatus according to claim 1, wherein the control unit aligns the positions of the first image to be recorded on the first side and the second image to be recorded on the second side based on the distance from the leading edge of the sheet.

9. 2. The recording apparatus according to claim 1, wherein the control unit reverses the image data in the width direction when the recording unit records an image on the second surface.

10. 2. The recording apparatus according to claim 1, wherein a margin on the first surface on the side of the first support portion and a margin on the second surface on the side of the second support portion are the same distance.

11. A cutting unit for cutting the sheet is provided, 2. The recording apparatus according to claim 1, wherein the control unit records an image on the first surface of the sheet after the leading edge of the sheet is cut by the cutting unit.

12. The recording device according to claim 1, further comprising a second supply section above the first supply section, the second supply section having a first support section that supports a first end side in the width direction of the roll on which the sheet is wound, and a second support section that supports a second end side.

13. The recording device described in claim 12, characterized in that a third control is executed in which an image on a first side is recorded by the recording unit on a sheet supplied from a roll supported at the first end by the first support portion and at the second end by the second support portion, and then the sheet on which the image has been recorded is wound up by the second supply portion to form a recorded roll.

14. The recording device described in claim 13, characterized in that the control unit executes a fourth control in which the recording unit records an image on the second side on a sheet supplied from the printed roll of the second supply unit, the first end of which is supported by the first support unit and the second end of which is supported by the second support unit.

15. 15. The recording apparatus according to claim 14, wherein whether to perform the first control or the third control is switched depending on the length of an image.

16. 16. The recording apparatus according to claim 1, wherein the recording unit is a recording head that ejects ink onto a sheet.

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