JP2008126530A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
JP2008126530A
JP2008126530A JP2006314374A JP2006314374A JP2008126530A JP 2008126530 A JP2008126530 A JP 2008126530A JP 2006314374 A JP2006314374 A JP 2006314374A JP 2006314374 A JP2006314374 A JP 2006314374A JP 2008126530 A JP2008126530 A JP 2008126530A
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Japan
Prior art keywords
paper
printing
sheet
data
image
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JP2006314374A
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Japanese (ja)
Inventor
Makoto Fukuyama
Katsunori Tanaka
克典 田中
真琴 福山
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Nippon Oce Kk
日本オセ株式会社
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Priority to JP2006314374A priority Critical patent/JP2008126530A/en
Publication of JP2008126530A publication Critical patent/JP2008126530A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet printer capable of performing double-sided printing on long paper such as roll paper, or even large format paper and performing the double-sided printing on the paper at an adequate position with high accuracy. <P>SOLUTION: A tip portion of paper supplied from a paper supply section is captured by means of an image capture means having an image capture element such as CCD or the like provided in a printer, position data of the paper are acquired from the image, and then a position on which an image is to be printed is determined according to the acquired position data. When it is judged that the acquired position data are deviated from a prescribed range, the deviation is corrected to determine a printing start position, and then the printing is performed. Consequently, the printing positions on the front and rear faces can be accurately matched with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image forming apparatus for long paper, and relates to an image forming apparatus capable of printing with very little deviation between the printing positions of the front and back surfaces even when double-sided printing is performed using long paper.

  Conventionally, printers and copiers that perform double-sided printing on cut sheets have been used. Also, printers capable of duplex printing have been developed for printers using roll paper. In general, in the case of duplex printing, after printing the first surface, the feeding direction is reversed at a predetermined part in the printer, and the front and back are reversed by passing through a different conveyance path from the first surface. A method for printing the second surface is used. In the case of cut paper, double-sided printing can be easily performed by the method as described above. However, when paper such as roll paper is long, after the first side is printed, until the end of the paper is obtained. It is necessary to wind it up and store it somewhere and reverse it.

  For example, Patent Document 1 describes an image forming apparatus that can perform double-sided printing by temporarily storing an image on a first surface in a spiral stock portion after transfer. Specifically, first, a sheet is pulled out from a roll paper installed in the apparatus, and when a necessary length is pulled out, the sheet is cut by a cutter, and an image is transferred and fixed on the first surface. Thereafter, the paper on which the image has been transferred to the first surface is once fed into the spiral stock portion, and the paper is spirally wound and stored in accordance with the shape of the stock portion. Then, the end that was the end of the paper at the time of printing the first side is pulled out from the stock unit, sent to the reverse conveyance path, and the second side is printed again at the transfer unit.

With such a printer configuration, double-sided printing can be easily performed even when long double-sided printing that is impossible with double-sided printing of cut sheets is required. In addition, when performing double-sided printing of long paper such as roll paper, the space required for reversal can be reduced compared to the prior art by temporarily storing the paper in a spiral stock section, and the device Can be miniaturized.
JP 2005-258251 A

  However, since the printer described in the patent document can reduce the size of the apparatus and form images on both sides at once at the entire length of a roll paper having a predetermined length, it is considered that the printing processing efficiency is improved. However, no consideration is given to accurately aligning the printing positions on both sides. This is because when the cut sheet is printed on both sides, the width and length are constant and it does not print on a very large sheet. This is because there is little need to consider this. Further, even in the case of roll paper, if the length is long but the width is about the same as that in the case of cut paper, the shift does not occur so much and it is not necessary to strictly consider the shift of the paper. As described above, the above configuration is sufficient when the front and back print positions do not require very high accuracy. However, when it is necessary to align the front and back print positions with high accuracy, the print positions are corrected accurately. It is necessary to perform printing.

  As an example of printing requiring such accuracy, there is an operation of confirming print data before making a printing plate for offset printing. In the plate making department for offset printing, especially in the case of CTP (Computer To Plate) printing, the step of producing a plate making film for printing on a printing plate is omitted, and printing is performed directly on the printing plate. Therefore, although an effect of cost reduction can be obtained, there is a demerit that calibration with a plate-making film cannot be performed. Therefore, a large-format ink jet printer is used to calibrate the printing plate from the printing data before the plate is produced. In the past, the front and back data were printed on separate paper on large paper, and the results were confirmed by pasting them together. For this reason, it takes time and labor to accurately bond, and it differs from the actual printed matter in that it is bonded, so double-sided printing on large paper has been required.

  However, the printed material for proofreading also needs to have the same printing position on the front and back with the same accuracy as the actual printed material. If this is the case, cutting may not be performed properly, and the edges of the printed surface may be cut off in the middle. The accuracy of double-sided printing in such applications is required to be within ± 0.2 mm between the printed surfaces of the front and back sides. However, the image forming apparatus described in the patent literature and the conventional technology use large format paper. It was impossible to achieve.

  Accordingly, the present invention provides an ink jet printer capable of performing duplex printing even on long paper such as roll paper and large format paper, and capable of performing duplex printing with high accuracy at the correct position of the paper. With the goal.

  In order to solve the above-described problems, an image forming apparatus according to the present invention is an image forming apparatus capable of performing double-sided printing using a roll-shaped paper, and images the paper to obtain a leading end region of the paper. Imaging means for acquiring image data including image processing means, image processing means for obtaining position data of the leading edge and side edges in the leading edge region of the paper using the image data, image forming means for forming an image on the paper, A cutting unit that cuts a sheet having an image formed thereon, a winding unit that is used to wind the sheet having an image formed on one side, and transport the sheet again to the image forming unit; And control means for controlling the drive of the cutting means. The control means uses the position data to control the drive of the image forming means when starting image formation on both sides of the paper, Driving wheel And controlling the timing.

  According to the present invention, double-sided printing can be performed with high accuracy even on long paper such as roll paper, and even large-size paper, which has conventionally been difficult to perform double-sided printing, can be printed on both the front and back surfaces at accurate positions.

  In order to achieve this high-precision printing, the printing portion is first provided with an imaging means (for example, including a CCD camera), thereby capturing an image of the paper at the start of drawing, the position of the leading edge of the paper, Get position data of both sides of. Since the position to be drawn is determined based on the position data of the sheet, printing can be performed at an accurate position from the end of the sheet, and high-precision printing is possible. In addition, even if a deviation occurs in the width direction of the paper when the paper is supplied (deviation with respect to the reference position), the print start position is determined based on the edge of the paper, so even a slight deviation can be corrected. Can be illustrated.

  Also, when performing double-sided printing, in order to accurately align the drawing positions of the first side (one side) and the second side (the other side), the print position end of the first side set to the cutting position Cut accurately to fit the distance. Thereby, the drawing start position of the second surface can be determined based on the distance from the end of the printed surface of the first surface to the cut position, and the print position can be adjusted with high accuracy.

  Furthermore, when printing the second side, it is necessary to feed the paper accurately, and for that purpose, it is necessary to wind the paper so that it does not meander or shift after printing the first side. For this purpose, the image forming apparatus according to the present invention winds the paper after printing the first surface on the take-up roller while measuring the tension and adjusting the take-up force. When printing on the surface, the paper can be fed straight out from the roll without excessive force, and deviation can be reduced.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an ink jet printer (image forming apparatus) according to the invention will be described based on embodiments shown in the drawings. In addition, a present Example is one Embodiment of this invention, It is not limited to this.

  FIG. 1 is a side sectional view schematically showing the internal structure of the ink jet printer 1 of this embodiment, and FIG. 2 is a block diagram of the configuration of the ink jet printer 1 of this embodiment and an operation terminal 8 such as a personal computer.

  First, the configuration of the inkjet printer 1 of the present embodiment will be described.

  Reference numeral 2 denotes an apparatus main body, and a printing unit 20 that performs printing is provided inside the apparatus main body 2. A first paper supply unit 3, a second paper supply unit 4, a paper tray 5, and an operation panel are provided outside the apparatus main body 2. 6 is provided. In the description of the present embodiment, the direction in which the sheet is conveyed in the apparatus main body 2 is defined as the sheet feeding direction (Y direction), and the direction perpendicular thereto is defined as the sheet width direction (X direction).

  First, the configuration of the first paper supply unit 3 will be described. In the first paper supply unit 3, a first roll 30 in which a pair of roll holders 32 is set on both sides of the axis of the roll paper 31 is set. The printer 1 of the present embodiment can use roll paper having a maximum length of about 120 m, and the paper size is, for example, a width of 297 mm to 914 mm and a length in the feed direction of about 200 mm to 5000 mm. It is possible to appropriately perform double-sided printing with any paper. FIG. 3 (a) shows a schematic view of this roll holder, and FIG. 3 (b) shows a schematic diagram of a first roll formed by setting roll paper in the roll holder. The pair of roll holders 32 includes a flange portion 321 and a shaft portion 322, and the shaft portion 322 of the roll holder 32 is inserted and fixed to a hollow shaft of roll paper from both sides. The inside of the flange portion 321 functions as a guide portion, and the paper is pulled out straight. In the figure, reference numeral 37 denotes a sheet drawn from the roll.

  When the roll holder 32 is set on the roll paper 31 and installed in the first paper supply unit 3, the outer periphery of the flange portion 321 comes into contact with the first rotating roller 33 provided in the first paper supply unit 3. Rotation is transmitted to the roll holder 32 by rotating the first rotating roller 33 by the first rotating roller driving mechanism 331 driven by the control of 7. As a result, the first roll 30 is rotated. The first rotation roller 33 is driven to rotate when the sheet is wound up by the first sheet supply unit 3 to rotate the first roll 30.

  On the other hand, when the paper is supplied to the printing unit, the first rotation roller 33 is not driven to rotate and is stopped, and the paper is pulled out from the first roll 30 by the transport roller 36. As a result, the first roll rotates by pulling out the paper while being pulled from the transport roller 36, so that the tension due to the weight of the first roll can be applied to the drawn paper 37, the slack of the paper Paper can be supplied without distortion. However, when the paper is slightly returned or rewinded for adjustment, the first rotating roller 33 is rotated in FIG. 1 to rotate the first roll counterclockwise.

  Further, the first paper supply unit 3 is arranged so that the axial center position of the installed first roll 30 always coincides with the horizontal center position of the printing unit, that is, from the paper supply unit to the printing unit 20. A pair of guide plates that move in conjunction with the axial direction of the first roll 30 is provided so that the paper can be fed straight. The guide plates move in conjunction with each other so that the distances from the central position in the horizontal direction of the printing unit are always the same, and the guide plate sandwiches the first roll 30 on which the roll holder 32 is set. Thus, the first roll 30 is easily set at the center of the first paper supply unit. In order to perform printing at an accurate position on the sheet, which is the object of the present invention, it is necessary to accurately feed the sheet. With this mechanism, the roll paper supply position can be accurately aligned.

  On the apparatus main body 2 side of the first paper supply unit 3, a first conveyance roller pair 36 controlled by the first paper insertion port 35 and the control unit 7 is provided. The first conveyance roller 36 detects the sheet by pulling out the sheet from the first roll 30 installed in the first sheet supply unit, inserting the leading end of the sheet into the first sheet insertion slot 35, and providing a sensor near the insertion slot. Rotates and pulls the paper into the print section. The first conveying roller 36 is provided so that a paper having a width smaller than that of the paper used in the printer 1 is positioned at the center of the paper in the width direction, and the paper can be fed straight to a position where printing is performed by the inkjet head 23. it can.

  The motor of the first roller driving mechanism 361 that drives the first conveying roller 36 is provided with an encoder, and the rotational speed of the motor is fed back to the control unit 7. The control unit 7 can calculate the distance traveled by the sheet sent out by the rotation of the first conveying roller 36 from the number of rotations of the motor.

  Next, the configuration of the printing unit 20 inside the apparatus main body 2 will be described. The printing unit 20 includes a feed roller 21 that feeds paper, an image pickup unit 22 that picks up paper and obtains paper position data, an inkjet head 23 that performs printing, a cutter 24 that cuts the printed paper, and a discharge port. 26 is provided.

  The feed roller 21 is a roller that is not rotationally driven by itself, and is for smoothly feeding the fed paper to the inkjet head 23.

  The image pickup unit 22 includes an image pickup device (CCD, CMOS, etc.) and a lens attached to the front surface thereof, picks up the supplied paper, takes the picked-up image into the control unit 7 and performs calculation to obtain paper position data. get. This position data is the position of the leading edge and both sides of the paper, and the print start positions set in advance based on this position data are actually set in the paper width direction (paper X direction) and paper feeding direction (paper Y direction). Determine on the paper. With respect to the print start position in the X direction, the position is accurately adjusted by moving the inkjet head 23, and the print start position in the Y direction, which is the feed-out direction, is provided in the first conveyance roller drive mechanism 361. Thus, the movement distance from the leading edge of the sheet is accurately calculated, and the position is adjusted by adjusting the rotation of the first conveying roller 36.

  In addition, when printing a proof of a printed matter or the like, if it is necessary to accurately align the printing positions of the first surface and the second surface using the register marks printed on the paper, the printed register marks are misaligned. It is determined whether or not the sheet is present, and if the sheet deviation is within a predetermined range (within an allowable range), the drawing is performed as it is, but if the sheet deviation exceeds the predetermined range, correction is performed. When the deviation occurs in the paper X direction and exceeds the allowable range (0 to a predetermined value), the ink jet head is automatically controlled to adjust the drawing position. Further, when it can be visually confirmed that the sheet is deviated in the feeding direction (Y direction), a value is input from the terminal 8 so as to correct the deviation, and the position of the sheet is determined by rotation of the feeding mechanism such as a conveyance roller. Adjustment is performed so that printing is performed without deviation from the designated print start position. The determination and correction of the drawing position will be described later in detail.

  The ink jet head 23 is controlled by the control unit 7, and print data input from the terminal 8 such as a personal computer is output from the print start position based on the position data. Printed paper printed by the inkjet head 23 is discharged from the discharge port 26 to the paper tray 5 outside the apparatus main body 2.

  The paper that has been printed is cut by the cutter 24 as necessary. As will be described later, in double-sided printing of long paper, the cutting position affects whether printing on the second side is started from an accurate position, so it is necessary to accurately cut out the paper. In the present embodiment, the encoder provided in the motor of the first transport roller driving mechanism 361 feeds back the motor rotation speed to the control unit 7 and calculates the moving distance of the sheet due to the rotation of the first transport roller 36 from the data. Also, when cutting, the distance that the sheet moves from the point of time when printing is completed is accurately calculated, and cutting is performed after a margin is secured.

  Among the above mechanisms, the rollers related to the conveyance of the paper, such as the first rotation roller 33 and the first conveyance roller 36, are controlled by the control unit 7 via each driving mechanism, and an excessive force is applied to the paper. Operates so as not to tear or clog.

  The paper tray 5 is larger than the width of the apparatus main body 2 in the paper feeding direction so that the paper discharged from the apparatus main body can be received. The discharge port 26 side of the tray 5 receives the paper discharged from the discharge port 26 and is inclined so that the paper slides down to the paper supply unit 3, 4 side of the apparatus 2. The end of the paper tray on the side of the paper supply units 3 and 4 is folded upward so that the discharged paper does not fall from the tray 5.

  A paper sensor 51 is provided below the apparatus body 2 of the paper tray 5 to detect the presence of paper on the paper tray. This is for adjusting the take-up tension applied to the paper when the first surface-printed paper is taken up by a second roller described later. When performing the double-sided printing process described later, when winding the printed paper on the first side, the paper is tensioned with no gap, and the paper is wound without tension. When the second side is printed and compared, it is possible to print with high accuracy because there is less shift in the printing position between the first side and the second side when the paper is pulled out from the rolled roll without applying tension. Met. For this reason, in this embodiment, after the first surface is printed, the paper discharged from the discharge port 26 is not wound with a winding tension while being pulled, but is wound with a certain margin. A sensor 51 is provided to detect whether or not a part of the discharged paper remains on the paper tray. As a result, when the paper sensor 51 detects the paper, a part of the paper remains in the paper tray and is taken up without applying the take-up tension. It is determined as follows. On the other hand, when the sensor 51 does not detect the sheet, the winding speed is faster than the sheet is discharged, and the control unit 7 performs the winding described later in order to prevent tension from being applied to the winding. Control is performed so as to stop the rotation of the second rotating roller that performs the removal. In addition, when it is necessary to increase the winding tension and wind it up, the tension may be applied.

  Next, the configuration of the second paper supply unit 4 will be described. The second paper supply unit 4 is provided below the first paper supply unit 3, and the configuration thereof is substantially the same as that of the first paper supply unit 3, and the roll holder 42 set in the second supply unit is attached. The second roll 40 is rotated by a second rotating roller 43 that is rotationally driven under the control of the control unit 7. The roll holder 42 also has a configuration similar to that of the roll holder of the first roll 30 and includes a flange portion 421 and a shaft portion 422. The second roll 40 rotates when the flange portion 421 contacts the second rotating roller. However, when performing double-sided printing in the printer as will be described later, the second roll 40 of the second paper supply unit is configured such that the roll holder 42 is attached only to the shaft 41 for winding the paper, and the first Roll up the paper with the printed side. Note that if the roll paper is set in the second paper supply unit 4 similarly to the first paper supply unit 3, it is possible to perform normal printing other than double-sided printing. Further, since the roll holders used for the first roll and the second roll are the same, they can be used for both the first and second paper supply units 3 and 4. It is also possible to transfer the roll to the first paper supply unit 3 and print the second surface from the first paper supply unit 3.

  When the paper is supplied from the second paper supply unit 4, as in the case of the first paper supply unit, the second rotation roller 43 is stopped and the paper is drawn out by the second transport roller. The paper is fed with tension to prevent sagging and distortion.

  A second insertion port 45 and a second transport roller 46 are provided on the apparatus main body 2 side of the second sheet supply unit 4, and the sheet of the second roll 40 set in the second sheet supply unit 4 is the second insertion port 45. When the sheet is inserted into the sheet, the sheet is drawn by the conveyance roller 46 and sent to the printing unit 20 via the conveyance path 47 for the second sheet supply unit 4. Similarly to the first paper supply unit 3, the motor of the second roller driving mechanism 461 that drives the second transport roller 46 is provided with an encoder, and the number of rotations of the motor is fed back to the control unit 7. It is possible to calculate the distance that the sheet is sent and moved by the rotation of the second conveying roller 46, and is used for adjusting the printing position and the cutting position as in the case of the first conveying roller. As will be described later, when performing double-sided printing processing, the second surface on which nothing is printed so that the surface on which the paper is printed is the surface to which ink is supplied from the inkjet head 23 in the printing unit 20. With the facing up, insert the end of the paper into the second insertion slot.

  As other parts constituting the printer 1, the operation panel 6 designates the type of paper to be printed by the printer 1, displays a failure state when a failure such as a paper jam occurs, and processes for the failure Used to specify. The terminal 8 stores data for forming an image on a sheet and transmits it to the printer 1 or is used for making fine settings when performing printing, such as setting margins.

  Next, as an example using the ink jet printer 1 of the present embodiment as described above, an operation of the printer 1 when actually performing double-sided printing will be described.

  First, the first roll 30 in which the roll paper 31 is set in the roll holder 32 is set in the first paper supply unit 3, and the leading end of the paper 37 drawn from the roll paper is inserted into the first paper insertion opening 35. The inserted drawer paper 37 is drawn into the apparatus main body 2 by the first transport roller 36 and sent out through the printing unit 20. At this time, the drawer paper is sent out by the transport roller 36, but the first rotation roller of the first paper supply unit 3 is stopped without being driven to rotate. As a result, the first roll 30 is subjected to its own weight, and the sheet is pulled out while being pulled by the conveying roller 36. Then, a certain tension is applied to the sheet, and the sheet can be conveyed so as to maintain an accurate direction without causing sagging or distortion of the sheet.

  The drawer paper sent to the printing unit 20 via the roller 21 by the first conveying roller 36 is imaged by the imaging unit 22 provided in the printing unit 20. Imaging is performed so that the leading edge of the paper and the surrounding side edge are within the imaging range, and the captured image data is sent to the control unit 7 to calculate the position data of the leading edge and the side edge of the paper. Based on the position data obtained by calculation, the print data output start position is determined on the paper according to the preset position, and the paper is printed by the inkjet head 23 or encoder so that printing can be accurately performed from the start position. Adjust the position. In addition, when it is determined that there is a deviation in the position of the paper in the X direction according to the printing position determination step described later, the movement of the inkjet head 23 is controlled in accordance with the deviation and the print output position is adjusted. Is possible. The detection of the paper position by the image pickup unit 22 can be performed with sufficient accuracy if the leading edge of the paper is imaged for each paper at the time of printing on the first side, the position data is acquired, and the drawing is adjusted. When there is a possibility of misalignment, such as when printing data is printed on one sheet of paper and the paper is long, the position of the paper is detected each time the data is output May be controlled. An image is printed on the first surface of the drawing paper by the inkjet head 23 while controlling the printing position accurately in this way.

  The printed paper on which the first surface has been printed is sent out of the apparatus main body 2 from the discharge port 26 and discharged to the paper tray 5. The paper tray 5 is larger than the width of the apparatus main body 2 in the paper conveyance direction so as to receive the paper 52 discharged from the discharge port 26 side of the apparatus main body 2, and the paper does not fall from the tray. The ends of the paper tray 5 on the paper supply units 3 and 4 side and the discharge port 26 side are folded back in the height direction of the printer 1. Further, the sheet tray 5 is lower on the sheet supply unit 3, 4 side than the discharge port 26 side so that the sheet 52 discharged from the discharge port 26 slides down to the sheet supply unit 3, 4 side which is the front surface of the apparatus body 2. It has become. As a result, the discharged paper 52 slides down to the front side of the apparatus so that the operator can easily take it out, and is stocked in the folded portion of the front side of the paper tray.

  Subsequently, in order to wind up the paper discharged for duplex printing, the leading edge of the paper 52 on which the first surface is printed and discharged to the paper tray 5 is attached to the second roll 40 of the second paper supply unit 4. . FIG. 4 shows the printer 1 in a state where the paper on which the first surface is printed is being wound up. In this case, the second roll 40 has roll holders 32 attached to both ends of a shaft 41 for winding paper. When the paper is attached, the front edge of the paper is fixed with a tape or the like so as to be parallel to the axis 41 of the second roll 40 so that no distortion occurs during winding. FIG. 4 shows a state in which the first printed surface is wound up by the second roll 40 so that the first printed surface is on the inner side. What is necessary is just to wind in the direction which can be supplied so that unnecessary force may not be applied to a paper, when sending out to the printing part via the roller 46. FIG.

  When the leading edge of the paper 52 is fixed to the second roll 40, the controller 7 drives the second rotation drive mechanism 431 to rotate the second rotation roller 42, and transmits the rotation of the second rotation roller 42 to the roll holder 42. The second roll is rotated to take up the paper. As shown in FIG. 4, the sheet printed on the first side and discharged from the discharge port 26 is wound around the second roll in a state where a part of the sheet is in contact with the sheet tray provided at the lower part of the apparatus main body 2. It will be. In this case, the first transport roller driving mechanism rotates to supply the paper, and the second roll rotates counterclockwise in the drawing to take up the paper. The winding of the paper can be performed simultaneously with the printing on the first surface. However, in this case, in order to prevent the winding of the first side from being faster than the speed at which the first surface is printed and discharged, and to affect the printing, the winding force is applied to the second roll 40 to prevent the paper from being affected. In order to prevent the paper from being too tightly wound, the paper sensor 51 provided in the paper tray 5 detects the paper. The mechanism and reason for the winding adjustment by the sensor are as described above, and the sensor 51 is used to wind the wound paper around the second roll so that no winding tension is applied so that the wound paper can be fed without distortion during the second side printing. Then, the sheet is wound up while detecting that the sheet remains in the sheet tray 5. At this time, if the sensor 51 cannot detect the paper, the control unit 7 controls the second rotating roller driving mechanism 431 so that the paper stays in contact with the paper tray 5 and the sensor 51 Winding is stopped until the paper is detected.

  As described above, the winding of the second roll 40 is continued simultaneously with the printing of the first surface, and when the printing of the first surface is completed, the paper is cut by the cutter 24 provided in the printing unit 20. The inkjet printer 1 according to the present embodiment measures the distance at which the sheet is fed out by measuring the number of rotations of the motor with an encoder provided in the motor in the first transport roller drive mechanism 361 and feeds it back to the control unit 7. The distance at which the paper is sent out from the leading edge position of the paper imaged by the unit is calculated. By using the paper feeding distance calculated in this way for the cutting process, the paper can be accurately moved by the distance obtained by combining the distance from the end of the printing area to the cutter 24 and the length of the preset margin. It is possible to obtain a sheet that has been accurately cut at the set cutting position. Detailed processing of cutting will be described in the description of each processing described later.

  When the first side is printed and the end of the sheet is obtained, the second side is printed. In FIG. 5, the printer 1 in a state in which the sheet having been printed on the first surface wound around the second roll 40 is supplied from the second roll 40 into the apparatus main body 2 for printing on the second surface. Is shown. When printing on the second surface, the end portion of the first surface printed paper wound around the second roll is inserted into the second insertion opening 45 provided on the apparatus main body 2 side of the second paper supply unit. insert. The inserted paper is pulled in by a second transport roller 46 provided in the insertion port 45, and is sent to the printing unit 20 via the second transport path 47. At this time, the drawing of the paper is performed in the same manner as when the paper is supplied from the first paper supply unit 3, and the paper is pulled out by the second roll by its own weight by pulling out the paper with the second transport roller while the second rotation roller is stopped. Pull out with tension. Thus, the paper can be conveyed with an accurate direction. Then, the second surface is printed while being controlled by the control unit 7 via each drive unit.

  Here, since the leading edge of the paper sent to the printing unit 20 at the time of printing the second side corresponds to the end of the printing on the first side, when printing the second side, the first side was printed. It is necessary to output the print data of the second side so that the order of the print data is reversed. Specifically, at the time of printing on the second side, all the print data on the second side are collectively rotated 180 degrees and output to be printed. In large format printing, multiple print data may be printed on one sheet of paper. In this case, if each data is rotated, it becomes necessary to correct the print position associated with each rotation. Processing efficiency decreases. Therefore, when printing continuously, all print data itself is rotated by 180 degrees and output. For example, when printing one of a plurality of print data at a position close to the right side of the paper, in order to rotate and output each individual data, in addition to the rotation of the print data itself, the right edge of the paper Therefore, it becomes necessary to determine the printing position by switching the left and right distances from the left side and the distance from the left end, and it takes time to convert the original data. However, if all the plurality of data are rotated together including the margin data around the print area, the data can be output and printed as it is. As a result, even when printing many pieces of print data on long paper such as roll paper, the original data is simply rotated. Even in the printer printing method according to the present invention, the efficiency of data processing decreases. Then there is no demerit.

  As described above, the data to be printed on the second side is rotated 180 degrees to print on the second side of the paper. As with the first side printing, the printing of the second side determines the printing start position by accurately detecting the position of the paper by the imaging unit 22, and if there is a deviation in the paper width direction, the deviation occurs. The print position is automatically corrected for the part of the printout. However, at the time of printing on the second side, when printing a plurality of pieces of print data on one long sheet, the position of the sheet is not detected by the image pickup unit 22 but only at the front end of each sheet. This is done at the time of drawing to correct the drawing position.

  This is because the paper supplied at the time of the second side printing is taken up by the take-up roller of the printer, and the winding state is not uniform as compared with the case where the paper is supplied from the roll paper at the time of the first side printing. This is because the paper supply is likely to be shifted. Therefore, it was sufficient to image the leading edge of the supplied paper during the first side printing and adjust the output position. However, during the second side printing, the paper is imaged at the start of each print data output. The position data is acquired and the presence or absence of deviation is determined. In this way, if there is a deviation, the print position is corrected for each print data and printing is performed at an accurate position. Also, it is possible to accurately match the printing positions of the first surface and the second surface.

  Further, regarding the deviation in the paper feeding direction, deviation from the printing on the first side is likely to occur during the second side printing. For this reason, when printing multiple pieces of print data on a single long sheet of paper, check the registration marks on the first and second sides visually, for example, to shift the paper feed direction (paper Y direction). If there is, the position of the output is corrected by inputting a length for correcting the deviation from the terminal 8 or the like.

  As described above, accurate control of the print start position, automatic adjustment of paper misalignment in the X direction, and manual correction of the feed direction make it possible to match the front and back printing surfaces even in double-sided printing that tends to cause misalignment. .

  The second surface is printed by the method as described above, and is discharged from the discharge port 26 by the discharge roller 25 and stacked on the paper tray 5 as in the case of printing the first surface. At this time, if the printed paper is long and difficult to handle as it is, the second roll 40 wound up after the first side printing is transferred to the first paper supply unit 3 and the first paper is supplied. The end of the surface-printed paper is inserted from the first insertion port, and the second surface is printed. In this state, a roll for winding the second side printed paper may be set in the second paper supply unit 4 so as to perform winding. Accordingly, a long sheet printed on both sides can be handled in a roll shape.

  Next, in this embodiment, an example of characteristic processing for printing on a long sheet with high accuracy will be described for each part.

  First, a process when an image is picked up by the image pickup unit 22 and the drawing position is determined based on the image data or correction of paper misalignment will be described.

  First, the processing for printing on the first surface will be described based on the flowchart shown in FIG. First, in step S101, the vicinity of the front end of the sheet sent to the printing unit is imaged using the imaging unit 22. Next, in step S102, the captured image data is taken into the control unit 7. Next, in step S103, the position data of the leading edge position and the both edge positions of the sheet is calculated from the image data captured by the control unit 7. Next, the drawing position is accurately determined based on the position data obtained in step S104. Specifically, the image data of both ends and the vicinity of the leading edge of the sheet that has been sent is acquired, and the position data of the both ends and the leading edge of the sheet are acquired. The positions of both side edges and the leading edge are set as reference positions, and a print start position set from the reference positions is determined. For example, when determining the position of the paper, if the print position is set to print from a position 30 mm from the left edge and 20 mm from the upper edge, the paper edge data is acquired from the image data obtained by imaging the paper, Based on the data, the positions of 30 mm and 20 mm from the edge of the paper are determined and output. At this time, if the imaging unit 22 performs imaging using a high-pixel imaging device of about 1 million pixels, it becomes possible to determine the position of the paper in units of 0.1 mm, so that data is used as described above. If the printing position is determined, the drawing can be performed according to the set arbitrary position. Further, when the paper is supplied with a deviation in the width direction of the paper, if the deviation is out of the allowable range, the printing position is determined by automatically correcting the deviation in the printing position determination step, and the drawing is performed. After the above positioning, drawing is started (S105), and when drawing is completed (S106), it is determined in step S107 whether or not all data is completed. If printing of all data is completed, the sheet is loaded in step S108. Cut and finish printing. If the drawing of all data has not been completed, the process returns to step S104 to determine the next data drawing position in order to output the next data. The above is the processing performed when printing on the first surface. Note that the paper is not necessarily cut, and if it is not necessary to cut, the paper can be cut.

  Next, a process for winding the paper on which the first surface, which is the front surface, is wound on a roll and printing the second surface will be described based on the flowchart of the position adjustment process shown in FIG. As in the first side printing, first, in step S201, the imaging unit 22 is used to image the vicinity of the leading edge of the sheet sent to the printing unit. Next, the captured image data is taken into the control unit 7 in step S202.

  Next, in step S203, the position data of the leading edge position and the both edge positions of the paper is acquired from the image data captured by the control unit 7. As in the first side printing, the drawing position is accurately determined in step S204, and drawing is started. At this time, when printing on the second side, which is the back side, the data to be output is rotated 180 degrees as described above, and printing is performed from the end of the paper at the time of printing on the first side. The distance in the paper feed direction to the cutting position is applied to the determination of the print start position on the second side so that the front and back print positions match. Therefore, in S202, the front end position of the paper is confirmed by the imaging unit 22 in order to match the print positions in the front and back sending directions, and the paper feed from the front end to the print start position is accurately performed by the encoder provided in the transport roller driving mechanism. And adjust the position. In addition, the alignment of the paper in the width direction (X direction) is the same process as in the first side printing, but during the second side printing, the paper is pulled out from the roll taken up by this printer. A slight shift in the width direction (X direction) of the paper is more likely to occur than during the first side printing. However, since the printing start position is determined based on the edge of the paper, printing can be started accurately from the position set corresponding to the slight deviation.

  The printing position is determined, drawing is started (S205), and when drawing of the print data is completed, it is determined whether drawing of all data is completed. When printing on the first side, the position data was obtained by acquiring the position data only at the leading edge of the paper, but when printing on the second side, it is necessary to match the printing on the first side accurately. This is because when printing data on a single long sheet, the position of the drawing is determined by checking the position of the edge of the sheet every time printing of the data is started. If there is still data to be drawn, the process proceeds to step S208, and the positions of the registration marks and the like on the first surface and the second surface are visually confirmed to determine whether the printing position is shifted in the paper feeding direction. If the deviation is not within the allowable range (0 to a predetermined value), a value corresponding to the deviation is input from the operation terminal 8 so as to correct the deviation in step S209 and the output position of the next data is corrected. For example, if it is determined that the sheet is shifted by 1 mm in the Y direction and exceeds the allowable range, the terminal 8 is printed so that the drawing position is shifted in a direction that cancels the shift of 1 mm. And adjust the feed distance using the encoder data.

  Next, the process proceeds to step S210 to determine whether or not to cut the sheet. When a plurality of print data are continuously printed on the first surface, the data can be cut so that each piece of data can be obtained with one cut sheet. In the case of cutting, it is cut in step S211. This completes the process of printing one data on the second surface, and returns to step S201 to perform the same process in order to print the next data. At the time of printing on the second side, the paper edge is imaged for each data to be printed and the drawing position is adjusted, so that it is possible to accurately match the printing position on the first side. If it is determined in step S207 that printing of all data has been completed, the process proceeds to step S212, where the end of the paper is cut, and printing ends.

  As described above, since the printer of this embodiment performs processing for checking the position of the paper for each print data during the second side printing, even the second side printing, which is likely to be shifted, accurately matches the printing position of the first side. Can be made. In addition, when there is a plurality of print data, even if a deviation occurs in the Y direction in the previous print, it can be corrected when the next data is output, thereby reducing paper waste and more efficiently. Double-sided printing is possible. It should be noted that the confirmation of the deviation of the paper in the Y direction (S208) and the input of the correction value (S209) are not necessarily performed after the completion of drawing S206 and before the paper cut S210, and it is confirmed that there is a deviation during printing. This may be done before printing the next data.

  Next, a processing method for cutting the paper printed in steps S108, S211 and S212 of the above process will be described. As described above in the explanation of the duplex printing operation, the encoders provided in the drive mechanisms 361 and 461 of the transport rollers 36 and 46 are used to calculate the paper feed distance by feeding back the rotational speed of the motor. Cutting at the cutting position.

  In the case of the printer of this embodiment, since the roll paper is printed on both sides instead of the cut paper, the set margin is measured and cut from the end of the print area after the first side printing. At this time, it is necessary to cut from the end of the printed area to the cutting position exactly as the set value. For example, even if the width of the margin is set to 50 mm, if the actual cutting position is 52 mm from the end of the printing area, the actual margin at the end of the first surface is 52 mm. Since the upper side is 50 mm, printing on the second surface starts from a position 50 mm from the leading edge of the paper. As a result, the printing position on the first side and the printing position on the second side are shifted by 2 mm in the paper feeding direction. To prevent such a shift, the distance that the paper moves from when drawing is completed is measured with the feedback of the encoder, and the distance from the end of the printed area to the cutter and the length of the preset margin are set. Cut at the point where the paper has moved the combined distance. In this way, it is possible to obtain a sheet that has been accurately cut with the set margin width.

  Next, when the paper on which the first surface is printed is wound up by the second roll 40, the winding speed adjustment processing will be described based on the flowchart of the winding operation processing shown in FIG. As described above, since the winding is performed without applying tension, the first printed sheet is discharged from the discharge port 26, and the paper is stored in the paper tray 5 at a part between the discharge port 26 and the second roll 40. It is necessary to wind it up with a margin enough to contact the

  Therefore, first, the leading edge of the paper on which the first surface is printed is set on the second roll 40, and a winding switch provided on the operation panel or the like is pressed to start the winding process (S301). Next, in step S302, it is determined whether or not the paper sensor 51 has detected the presence or absence of paper. When the sheet is detected, the second rotating roller is driven to rotate and the second roll 40 is rotated to wind the sheet (S303). Then, step S202 and step S303 are repeated to detect the sheet, and winding is performed in a state where no winding tension is applied. If printing stops or the speed at which paper is ejected slows down, so that the ejected paper does not remain in the tray 5 and the sensor 51 cannot detect the paper, the process proceeds to step S304. The winding of the second roll 40 is stopped. In step S305, it is determined whether or not all data has been drawn.

  Here, the confirmation of the completion of the drawing of all the data is that the paper is cut when all the data is drawn and the printing is finished. The paper that has been wound up is wound up to the vicinity of the cut edge of the paper. This is because, finally, the paper does not contact the paper sensor 51 and is not detected by the sensor 51.

  If it is determined that drawing of all data has not been completed, steps S302 to S305 are repeated until a sheet is detected. The situation that is assumed when all the data is not output and the paper is not detected is that the print speed is reduced or the printing is stopped for some reason, and the paper is ejected after a certain period of time. It is conceivable that the length of the paper to be taken up is longer than the length to be taken up and the paper that has accumulated in the paper tray is taken up. Continuing winding in such a situation will cause the remaining paper tray to run out, pulling the paper remaining in the printing section, and causing printing to be disrupted or the paper to be torn. Become.

  Thereafter, while the above steps are repeated, printing is resumed, the paper is discharged, the paper again accumulates in the paper tray 51, and if the paper sensor 51 detects the paper, the process proceeds to step S303, and the second roll 40 Rotate to resume winding.

  Finally, if it is determined in step S305 that all data has been drawn and printing has been completed, the winding process ends at that point.

  Note that if the winding speed of the second roll is too slow compared to the discharging speed, the printed paper will accumulate too much in the paper tray, causing it to fall out of the paper tray, and not be discharged smoothly, causing paper jams. Since there is a possibility that printing will be affected, such as waking up, it is preferable to set the winding speed slightly higher than the discharge speed. This winding process can also be applied to the case where winding is performed by the first paper supply unit.

1 is a schematic diagram showing a cross section of an embodiment of an image forming apparatus according to the present invention. 1 is a block diagram showing a configuration of an embodiment of an image forming apparatus according to the present invention. FIG. 3 is a schematic diagram of (a) a roll holder and (b) a first roll and a second roll attached with the roll holder of the paper supply unit of the image forming apparatus shown in FIG. FIG. 2 is a schematic cross-sectional view showing a state where the discharged paper is being wound up in the image forming apparatus shown in FIG. FIG. 2 is a schematic cross-sectional view illustrating a state in which image formation is performed by supplying paper from a second roll in the image forming apparatus illustrated in FIG. 6 is a flowchart illustrating processing steps when imaging, drawing out, and cutting a first sheet of paper in the image forming apparatus of the present embodiment. 6 is a flowchart illustrating processing steps when imaging, drawing out, and cutting a second sheet of paper in the image forming apparatus of the present embodiment. 6 is a flowchart illustrating processing when winding up a sheet in the image forming apparatus according to the present exemplary embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printer 2 Apparatus main body 20 Printing part 21 Feeding roller 22 Imaging unit 23 Inkjet head 24 Cutter 26 Discharge port 3 1st paper supply part 30 1st roll 4 2nd paper supply part 40 2nd roll 47 2nd conveyance path 5 Paper tray 51 Paper sensor 6 Operation panel 7 Control unit 8 Terminal

Claims (6)

  1. An image forming apparatus capable of performing double-sided printing using roll-shaped paper,
    Imaging means for imaging the paper and acquiring image data including a front end region of the paper;
    Using the image data, image processing means for obtaining position data of the leading edge and the side edge in the leading edge region of the paper;
    Image forming means for forming an image on the paper;
    A cutting means for cutting a sheet having an image formed on one side;
    A winding unit used to wind up a sheet on which an image is formed on the one surface and transport the sheet again to the image forming unit;
    Control means for controlling the driving of the image forming means and the cutting means,
    The control means uses the position data to control driving of the image forming means when starting image formation on both sides of the paper, and to control driving timing of the cutting means. Forming equipment.
  2.   2. The image forming apparatus according to claim 1, wherein the control unit determines a start position of image formation in the conveyance direction and the width direction of the sheet based on the position data.
  3. The control means includes
    Using the position data, it is determined whether the amount of deviation of the position of the side with respect to the reference position is within an allowable range,
    3. The image forming apparatus according to claim 1, wherein when it is out of an allowable range, a driving position of the image forming unit when performing image formation is changed according to the shift amount.
  4.   The image forming apparatus according to claim 1, wherein the winding unit winds the sheet in a state where no winding tension is applied.
  5.   5. The control unit according to claim 1, wherein the control unit detects a transport distance of the sheet from the position of the leading edge, and drives the cutting unit when the predetermined transport distance is reached. The image forming apparatus according to one.
  6.   6. The image according to claim 1, wherein the image forming unit applies ink for forming an image on the paper while moving in the width direction of the paper. Forming equipment.
JP2006314374A 2006-11-21 2006-11-21 Image forming apparatus Pending JP2008126530A (en)

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JP2016179697A (en) * 2016-07-14 2016-10-13 キヤノン株式会社 Image formation device
CN108608748B (en) * 2017-03-10 2020-08-11 佳能株式会社 Printing apparatus, control method, and non-transitory storage medium
US20180257406A1 (en) * 2017-03-10 2018-09-13 Canon Kabushiki Kaisha Printing apparatus, control method, and non-transitory storage medium
CN108608748A (en) * 2017-03-10 2018-10-02 佳能株式会社 Printing device, control method and non-transitory storage medium
US10730323B2 (en) 2017-03-10 2020-08-04 Canon Kabushiki Kaisha Printing apparatus, control method, and non-transitory storage medium

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