JP2012176512A - Printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing apparatus that properly prints without causing neither a diagonal conveyance nor the deformation, even if printing on an envelope such as a window envelope and the envelope with the release paper of paste.SOLUTION: The printing apparatus includes: a transport roller 138 in which a driving roller 138a which performs driving rotation and a driven roller 138b which carries out pressure welding to the driving roller 138a are provided on a conveyance path as a couple, and which carries out acceleration transporting of an envelope Z by rotating, while increasing a rotational speed of the driving roller 138a and the driven roller 138b while holding the envelope Z; and a control part 70 which makes the driving roller 138a stop the acceleration conveyance of the envelope Z during the region information of low friction coefficient in the print medium is input and based on this input region information, the driving roller 138a carries out pressure welding to the area with a low friction coefficient of the envelope Z.

Description

  The present invention relates to a printing apparatus that prints on a conveyed printing paper based on image data.

  In general, various printing apparatuses such as an ink jet printing apparatus that performs color printing on printing paper conveyed from a paper feed tray by discharging ink from a plurality of ink jet heads based on image data are well known.

  In recent years, printing apparatuses that place an envelope with a window on a paper feed tray, convey the envelope with a window from a paper feed tray by a conveyance roller, and print on the conveyed envelope with a window have begun to spread.

  For example, in Patent Document 1, the length and window position of the envelope with a window conveyed by the conveyance unit are detected, and the image data is rotated or enlarged according to the detected length and window position of the conveyance direction. There has been proposed an image forming apparatus that performs image processing such as reduction processing and forms an image on an envelope with a window based on the image data subjected to the image processing.

JP 2006-239896 A

  However, in the image forming apparatus described in Patent Literature 1, image processing such as rotation processing and enlargement / reduction processing is performed on image data according to the detected length in the conveyance direction and the window position. Regardless of the window position, the sheet is conveyed by the conveying roller, and therefore, when conveyed by the accelerating or decelerating conveying roller, the conveying roller contacting the window of the windowed envelope slips, and the envelope with the window is inclined with respect to the conveying direction In some cases, wrinkles or the like may be deformed in the slipped portion.

  Also, when printing envelopes with glue release paper, as with windows, the transport roller that contacts the glue release paper slips and the envelope with glue release paper moves in the transport direction. Deformations such as being transported obliquely or peeling of the slipped part of the release paper may occur.

  The present invention has been made in view of the above problems, and provides a printing apparatus that appropriately prints without causing oblique conveyance or deformation even when printing on an envelope with a window or an envelope with an adhesive release paper. The purpose is to do.

  In order to achieve the above object, a first feature of a printing apparatus according to the present invention is that a roller that is rotationally driven and a counter member that is driven in pressure contact with the roller are provided as a pair on the conveyance path so as to sandwich the print medium. In this state, conveying means for accelerating and conveying the print medium by rotating while increasing the number of rotations of the roller, and area information having a low friction coefficient in the print medium are input, and based on the input area information Then, while the roller is in pressure contact with the region where the friction coefficient of the printing medium is low, the conveying means includes control means for stopping the accelerated conveyance of the printing medium.

  A second feature of the printing apparatus according to the present invention is that, based on the position information, the control unit is arranged such that, while the roller is in pressure contact with a region with a low friction coefficient of the print medium, The printing medium is conveyed at a substantially constant speed by rotating the roller at a substantially constant rotational speed with the printing medium sandwiched therebetween.

  A third feature of the printing apparatus according to the present invention is that the control unit calculates an acceleration for accelerating and conveying again after a region where the friction coefficient of the printing medium is low passes through the roller. Means is to cause the print medium to be accelerated and conveyed at the calculated acceleration.

  A fourth feature of the printing apparatus according to the present invention is that the control means transports the print medium at the end of transport when the accelerated transport is performed at a substantially constant acceleration without stopping the accelerated transport. As described above, after the region where the friction coefficient of the printing medium is low passes through the roller, the acceleration for the accelerated conveyance is calculated again, and the printing medium is transferred to the conveying means at the calculated acceleration. Accelerated transport.

  According to the first feature of the printing apparatus of the present invention, region information with a low friction coefficient in the print medium is input, and based on the input region information, the roller is set to a region with a low friction coefficient of the print medium. During press contact, the conveyance means stops the accelerated conveyance of the print medium, so even when printing on special envelopes such as envelopes with windows and envelopes with glue release paper, without causing oblique conveyance or deformation Can be printed properly.

  According to the second feature of the printing apparatus according to the present invention, the roller in a state where the printing medium is sandwiched between the conveying means while the roller is pressed against the region where the friction coefficient of the printing medium is low, based on the position information. Therefore, while the roller is in pressure contact with the region where the friction coefficient of the printing medium is low, the printing medium can be conveyed without applying a rotational load to the roller and without decelerating.

  According to the third feature of the printing apparatus according to the present invention, the acceleration for accelerating and conveying again after the region where the friction coefficient of the printing medium is low passes through the roller is calculated by the conveying means. Since the print medium is accelerated and conveyed by acceleration, the print medium can be conveyed at an optimum acceleration according to, for example, the material of the print medium after an area having a low friction coefficient of the print medium passes through the roller.

  According to the fourth feature of the printing apparatus according to the present invention, printing is performed so that the conveyance of the printing medium is completed at the end of conveyance when the conveyance is accelerated at a substantially constant acceleration without stopping the acceleration conveyance. After the roller has passed through the roller in the area where the friction coefficient of the medium is low, the acceleration for the accelerated conveyance is calculated again, and the conveyance means accelerates and conveys the print medium at the calculated acceleration. Even when the accelerated conveyance of the printing medium is stopped while being pressed against the region where the coefficient is low, the conveyance can be completed without reducing the productivity.

It is a block diagram which shows the structure of the inkjet printing apparatus which is one Embodiment of this invention. It is the figure which showed the function structure of the inkjet printing apparatus which is one Embodiment of this invention. It is the flowchart which showed the process sequence in the inkjet printing apparatus which concerns on one Embodiment of this invention. It is the figure which showed an example of the preview screen displayed on the display / input panel 61 of the operation part 60 with which the inkjet printing apparatus 1 which concerns on one Embodiment of this invention is provided. (A) is a figure explaining the production | generation of the high-speed conveyance schedule of the surface in the inkjet printing apparatus which concerns on one Embodiment of this invention, (b) is the inkjet printing apparatus which concerns on one Embodiment of this invention, It is a figure explaining the production | generation of the high-speed conveyance schedule of a back surface. In the inkjet printing apparatus which concerns on one Embodiment of this invention, it is the figure explaining the production | generation of the low-speed conveyance schedule of the surface of an envelope. In the inkjet printing apparatus which concerns on one Embodiment of this invention, it is the figure explaining the production | generation of the high-speed conveyance schedule and low-speed conveyance schedule of the surface of an envelope in the case of decelerating while the drive roller is pressingly contacting a window part.

  Embodiments of the present invention will be described with reference to the drawings.

  In one embodiment of the present invention, line-type inkjet printing is provided that includes a plurality of inkjet heads each having a large number of nozzles, and discharges black or color ink from each inkjet head to print on a printing sheet line by line. The apparatus will be described as an example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Overall configuration of inkjet printing apparatus>
The structure of the inkjet printing apparatus 1 which is one Embodiment of this invention is demonstrated in detail.

  FIG. 1 is a configuration diagram illustrating a configuration of an inkjet printing apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 1, the inkjet printing apparatus 1 includes a side paper feed unit 10, an internal paper feed unit 20, a printing unit 30, a first paper discharge unit 40, a reversing unit 50, and a second paper discharge unit. 80.

  The side paper feeding unit 10 includes a paper feeding table 11 on which the printing paper W is stacked, and a primary paper feeding unit 12 that conveys only the uppermost printing paper W from the paper feeding table 11 onto the paper feeding conveyance path FR. And a secondary paper feeding unit 14 for carrying the printing paper W conveyed by the primary paper feeding unit 12 onto the circulation conveyance path CR. The secondary paper feed unit 14 includes a drive roller 14a that rotates by rotation of a motor (not shown), and a driven roller 14b that rotates by being pressed against the drive roller 14a.

  The internal paper feed unit 20 includes a paper feed tray 21a on which the print papers W are stacked, and a primary paper feed unit 22a that transports only the uppermost print paper W from the paper feed tray 21a onto the paper feed transport path FR. The printing paper W is laminated, the primary paper supply unit 22b that conveys only the uppermost printing paper W from the paper feeding base 21b onto the paper feeding conveyance path FR, and the printing paper W. Sheet feeding table 21c, a primary sheet feeding unit 22c that conveys only the uppermost printing sheet W from the sheet feeding table 21c onto the sheet feeding conveyance path FR, and a sheet feeding table 21d on which the printing sheets W are stacked. And a primary paper feed section 22d for transporting only the uppermost printing paper W from the paper feed tray 21d onto the paper feed transport path FR. Here, an envelope is placed as the printing paper W on the paper feed tray 11 of the side paper feed unit 10.

  In this way, the printing paper W is conveyed from the side paper feeding unit 10 and the internal paper feeding unit 20 to the secondary paper feeding unit 14, and further, the printing paper W is also conveyed from the reversing unit 50 described later.

  Therefore, in front of the secondary paper feeding unit 14 in the transport direction, the transport path of the fed printing paper W and the path through which the paper on which one side is printed are circulated and merged are joined A point exists. Based on this merging point, the path on the paper feed mechanism side is referred to as a paper feed conveyance path FR, and the other path is referred to as a circulation conveyance path CR.

  The printing unit 30 includes a paper transport unit 133 that transports the print paper W on the circulation transport path CR, and an ink jet head unit 31 that is provided above the paper transport unit 133 and incorporates a plurality of ink jet heads.

  A paper sensor 135 is provided on the paper transport unit 133 in the circulation transport path CR, that is, between the secondary paper feed unit 14 and the printing unit 30. The paper sensor 135 is provided with optical sensors over the entire width direction of the paper transport unit 133, and is reflected on the surface over the entire width direction of the printing paper W transported below the paper sensor 135. Detect reflected light.

  The paper transport unit 133 includes an annular platen belt 132, and the printing paper W fed by the secondary paper feed unit 14 is placed on the platen belt 132 by a suction fan 131 (described later) installed in the platen belt 132. The ink is sucked by the ink and is printed on the printing paper W by the ink ejected from the inkjet head unit 31 while being transported on the transport path at a predetermined transport speed.

  The printing paper W printed by the printing unit 30 is conveyed on the circulation conveyance path CR by conveyance rollers 137, 138, 139 and the like arranged on the circulation conveyance path CR. On the circulation conveyance path CR, the printing paper W conveyed on the circulation conveyance path CR is guided to the first paper discharge unit 40 to be discharged out of the circulation conveyance path CR, or on the circulation conveyance path CR. A switching mechanism 43 for switching between circulation is provided.

  The switching mechanism 43 switches the printing paper W in order to guide the printing paper W to one of a first paper discharge unit 40 and a reversing unit 50 described later.

  The first paper discharge unit 40 includes a tray-shaped paper discharge table 41 protruding from the casing of the inkjet printing apparatus 1 and a pair of paper discharge rollers 42 that guide the print paper W to the paper discharge table 41. Yes. Then, the printing paper W guided to the first paper discharge unit 40 by the switching mechanism 43 is conveyed to the paper discharge table 41 by the paper discharge roller 42 and stacked on the paper discharge table 41 with the printing surface facing down.

  The reversing unit 50 reverses the printing paper W, and the reversing unit 51 conveys the printing paper W from the circulation conveyance path CR to the reversing table 51 or conveys the printing paper W from the reversing table 51 onto the circulation conveyance path CR. And a roller 52.

  The printing paper W guided to the reversing unit 50 by the switching mechanism 43 is transported from the circulation transport path CR to the reversing table 51 by the reversing roller 52, and is transported from the reversing table 51 to the circulation transport path CR after a predetermined time. Thus, the front and back are reversed with respect to the circulation conveyance path CR. The printing paper W whose front and back are reversed is conveyed toward the printing unit 30 on the circulation conveyance path CR by a plurality of rollers such as a conveyance roller 53 provided on the circulation conveyance path CR.

  The separation flipper 136 guides the printing paper W conveyed on the circulation conveyance path CR to a second sheet discharge unit 80 described later so as to be discharged out of the circulation conveyance path CR, or on the circulation conveyance path CR. Switch between circulating.

  The second paper discharge unit 80 includes a tray-shaped paper discharge table 81 protruding from the casing of the inkjet printing apparatus 1, and a pair of paper discharge rollers 82 that guide the print paper W to the paper discharge table 81. Yes. Then, the printing paper W guided to the second paper discharge unit 80 by the separation flipper 136 is conveyed to the paper discharge table 81 by the paper discharge roller 82 and is stacked on the paper discharge table 81 with the print surface facing up.

  In addition, a plurality of conveyance rollers (hereinafter referred to as acceleration conveyance rollers) for accelerating and conveying the printing paper W are provided on the circulation conveyance path CR in order to shorten the time until printing is completed. Specifically, a conveyance roller 138 disposed at a point where the curved path on the circulation conveyance path CR is switched to a straight path, a reversing roller 52 that conveys the printing paper W from the reversing unit 50, and the primary sheet feeding. The secondary paper supply unit 14 that conveys the printing paper W conveyed by the unit 12 onto the circulation conveyance path CR is collectively referred to as an acceleration conveyance roller. These accelerating transport rollers include a drive roller that is driven to rotate about the rotation axis on the circulation transport path CR, and a driven roller that rotates while being pressed against the drive roller, and is driven with the printing paper W sandwiched therebetween. The printing paper W is accelerated and conveyed by rotating while increasing the number of rotations of the roller and the driven roller. For example, the transport roller 138 includes a driving roller 138a that rotates by rotation of a motor (not shown), and a driven roller 138b that rotates by being pressed against the driving roller 138a.

<Functional Configuration of Inkjet Printing Apparatus 1>
FIG. 2 is a diagram illustrating a functional configuration of the inkjet printing apparatus 1 according to the embodiment of the present invention.

  As shown in FIG. 2, the inkjet printing apparatus 1 according to an embodiment of the present invention is connected to a terminal 100 via a network 9.

  The terminal 100 generates image data by executing software, shows the generated image data, information indicating whether or not an envelope printing mode for executing envelope printing is set, low-speed printing or high-speed printing Print job including information, paper size, number of copies to be printed, position of a low friction coefficient area, that is, print setting information which is various setting information of printing such as information indicating the position of the window and the position of the adhesive release paper The data is transmitted to the inkjet printing apparatus 1 via the network 9.

  The ink jet printing apparatus 1 includes an image reading unit 2 and an image forming apparatus 3.

  The image reading unit 2 is provided on the upper part of the image forming apparatus 3. Although not shown, the image reading unit 2 is placed on a contact glass on which an original is placed, a cover provided so as to be able to come in contact with and away from the contact glass, and the contact glass. A scanning unit that scans the original and a lens that focuses the scanned image. The image reading unit 2 includes an image processing unit 2a that processes a focused image.

  The scanning unit scans the original placed on the contact glass line by line, and the image processing unit 2a processes the scanned image, thereby reading the image data.

  The image forming apparatus 3 includes a side paper feeding unit 10, an internal paper feeding unit 20, a printing unit 30, a first paper discharge unit 40, a reversing unit 50, a second paper discharge unit 80, and an operation unit 60. , A control unit 70, a network interface unit 81, and an external interface unit 82. Among these configurations, the side paper feed unit 10, the internal paper feed unit 20, the printing unit 30, the first paper discharge unit 40, the reversing unit 50, and the second paper discharge unit 80 have been described above. Therefore, explanation is omitted.

  The operation unit 60 is provided on the upper part of the inkjet printing apparatus 1, and includes a display / input panel 61, a start key for starting image reading and printing, a stop key for stopping image reading and printing, and the number of printed sheets. Various operation keys such as a numeric keypad (not shown) for inputting the operation signal and the like, and an operation signal based on a user operation is supplied to the control unit 70.

  The display / input panel 61 of the operation unit 60 includes a pressure-sensitive or electrostatic transparent touch panel disposed on the front surface and a liquid crystal display panel (none of which is shown) disposed on the back surface of the touch panel. ing. The user touches the surface of the touch panel directly with a finger while looking at the display screen of the liquid crystal display panel, for example, to set an area on the envelope displayed on the display screen, or to perform low-speed printing or high-speed printing. Various setting input operations such as an operation for setting one of them can be performed.

  The network interface unit 81 is a communication interface such as a network card. By connecting the inkjet printing apparatus 1 to the network 9 through the network interface unit 81, a print job is received from the terminal 100 connected to the network 9, Send and receive various signals.

  The external interface unit 82 is a connection interface with the image reading unit 2, and supplies the image data read by the image reading unit 2 to the control unit 70.

  The RAM 83 is composed of a volatile semiconductor or the like, and stores data or the like necessary for the control unit 70 to execute various processes. For example, the RAM 83 stores coordinate data of a specified area supplied from the display / input panel 61 based on a user operation, as will be described later.

  The control unit 70 performs central control of the inkjet printing apparatus 1. Moreover, the control part 70 is provided with the receiving part 70a, the determination part 70b, the conveyance schedule production | generation part 70c, and the apparatus control part 70d on the function.

  The receiving unit 70 a receives a print job transmitted from the terminal 100 via the network interface unit 81. The receiving unit 70a receives a print job transmitted from the image reading unit 2 via the external interface unit 82.

  The determination unit 70b determines whether the print job received by the reception unit 70a includes information for setting the envelope print mode. Further, the determination unit 70b determines whether or not the print job includes information indicating the position of the region having a low friction coefficient, that is, the position of the window or the position of the adhesive release paper.

  The conveyance schedule generation unit 70 c generates a conveyance schedule for conveying the printing paper W. In particular, when transporting an envelope having a low friction coefficient, that is, an envelope having a window or a glue release paper that is one of the printing paper W, the transport schedule generation unit 70c sets a region with a low friction coefficient in the envelope. Based on the position information (area information) indicating the position of the set area, the acceleration conveyance roller stops the acceleration conveyance of the envelope while the driving roller is in pressure contact with the area where the envelope has a low coefficient of friction, and the envelope A conveyance schedule is generated so that the envelope is conveyed at a substantially constant speed by rotating the rotational speeds of the driving roller and the driven roller at a substantially constant value in a state where the sheet is sandwiched therebetween.

  Further, the conveyance schedule generation unit 70c is configured so that the conveyance of the envelope ends at the end of conveyance when the conveyance is completed when the acceleration conveyance of the acceleration conveyance roller is conveyed at a substantially constant acceleration without stopping the acceleration conveyance roller. Acceleration for re-accelerated conveyance after the region where the coefficient of friction of the envelope is low passes through the driving roller is calculated, and a conveyance schedule is generated so that the acceleration conveyance roller accelerates and conveys the envelope at the calculated acceleration.

<Operation of Image Forming Apparatus>
Next, the effect | action in the inkjet printing apparatus 1 which concerns on one Embodiment of this invention is demonstrated in detail.

  FIG. 3 is a flowchart showing a processing procedure in the inkjet printing apparatus 1 according to an embodiment of the present invention. Here, a case where printing is performed on an envelope Z that is one of the printing papers W placed on the side paper feeding unit 10 will be described.

  As illustrated in FIG. 3, the receiving unit 70a of the control unit 70 determines whether a print job has been received (step S101).

  If it is determined in step S101 that a print job has been received (YES), the determination unit 70b of the control unit 70 determines whether or not the envelope printing mode is set (step S103). Specifically, the determination unit 70b determines that the envelope print mode is set when the received print job includes setting information in which the envelope print mode is set.

  If it is determined in step S103 that the envelope printing mode is not set (NO), the device control unit 70d of the control unit 70 executes normal printing processing (step S104).

  On the other hand, when it is determined that the envelope printing mode is set (YES), the determination unit 70b determines whether or not position information is included in the print job (step S105). Specifically, the determination unit 70b determines whether or not the print job includes information indicating the position of the region having a low friction coefficient, that is, the position of the window or the position of the adhesive release paper.

  If it is determined in step S105 that the print job includes position information (in the case of YES), the control unit 70 causes the RAM 83 to store position information of an area with a low friction coefficient (step S106).

  On the other hand, if it is determined in step S105 that the position information is not included in the print job (NO), the control unit 70 prompts the display / input panel 61 of the operation unit 60 to start image reading. For example, a message such as “Set the envelope to be printed on the scanner and press the reading start button” is displayed (step S107).

  Next, the control unit 70 determines whether or not the start of image reading is requested (step S109).

  If it is determined in step S109 that the start of image reading has been requested (YES), the device control unit 70d of the control unit 70 executes image reading processing (step S111). Specifically, based on an instruction from the device control unit 70d, the scanning unit of the image reading unit 2 scans the envelope Z placed on the contact glass line by line. Then, the image processing unit 2a divides the image into several regions based on the color and brightness based on the scanned image. Thereby, it can divide | segment into the several area | region grouped for every part with a near friction coefficient.

  Next, the control unit 70 causes the display / input panel 61 of the operation unit 60 to display the image data read in step S111 as a preview screen (step S113).

  FIG. 4 is a diagram illustrating an example of a preview screen displayed on the display / input panel 61 of the operation unit 60 included in the inkjet printing apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 4, the read image data 501 of the envelope Z is displayed on the preview screen displayed on the display / input panel 61, and the image processing unit 2 a groups the parts close to the friction coefficient. The area 501 and the area 503 thus displayed are displayed.

  Further, a message 504 such as “Please specify an area with a low friction coefficient” is displayed on the preview screen.

  When one of the divided area 502 or area 503 displayed on the display / input panel 61 is designated by the user operation, the conveyance schedule generation unit 70c of the control unit 70 causes the friction coefficient in the envelope. Set the area where is low. Specifically, the conveyance schedule generation unit 70c of the control unit 70 stores the read size of the envelope Z in the RAM 83, and compares the coordinates of the designated area with the other divided areas. The position information (region information) of the region having a low coefficient is stored in the RAM 83 (step S115).

  Next, the control unit 70 determines whether image reading processing has been executed for both sides of the envelope Z (step S117).

  Then, the control unit 70 determines whether or not low-speed printing is set (step S119). Specifically, if the received print job includes information for which low-speed printing or high-speed printing is set, the control unit 70 determines whether low-speed printing is set based on this information. If the received print job does not include information for which low-speed printing or high-speed printing is set, low-speed printing is set based on the operation information supplied from the display / input panel 61 by user operation. It is determined whether or not it has been done.

  If it is determined in step S119 that high-speed printing is set (in the case of NO), the conveyance schedule generation unit 70c of the control unit 70 generates a high-speed conveyance schedule for each of the front and back surfaces of the envelope Z (step S121). ). The generation of the high-speed transfer schedule will be described later.

  On the other hand, if it is determined in step S119 that the low-speed printing is set (in the case of YES), the conveyance schedule generation unit 70c of the control unit 70 generates a low-speed conveyance schedule for each of the front surface and the back surface of the envelope Z ( Step S123). The generation of the low speed conveyance schedule will be described later.

  Next, the determination unit 70b of the control unit 70 determines whether or not the surface of the conveyed envelope Z has been detected (step S125). Specifically, the determination unit 70b is transported based on the detected value of the reflected light detected by the paper sensor 135 and the position information of the area of the envelope Z having a low friction coefficient stored in the RAM 83. It is determined whether or not the surface of the envelope Z is detected.

  If it is determined in step S125 that the surface of the conveyed envelope Z has been detected (in the case of YES), the device control unit 70d conveys the envelope Z based on the conveyance schedule of the surface. Specifically, when the low-speed printing is set, the device control unit 70d performs the conveyance of the envelope Z based on the front-side low-speed transfer schedule, and when high-speed printing is set, the device control unit 70d sets the front-side high-speed transfer schedule. Based on this, the envelope Z is conveyed.

  On the other hand, when it is determined in step S125 that the back surface of the envelope Z that has been transported is detected (in the case of NO), the device control unit 70d transports the envelope Z based on the back surface transport schedule. Specifically, the device control unit 70d conveys the envelope Z based on the low-speed conveyance schedule on the back surface when low-speed printing is set, and sets the high-speed conveyance schedule on the back surface when high-speed printing is set. Based on this, the envelope Z is conveyed.

  Next, the control unit 70 determines whether or not a predetermined number of prints have been completed (step S131), and if the predetermined number of prints have been completed, the process ends.

  In the inkjet printing apparatus 1 according to the embodiment of the present invention, in step S105, it is determined whether or not position information is included in the print job received by the receiving unit 70a. However, the present invention is not limited to this. .

  For example, it may be determined whether or not position information is supplied from the image reading unit 2, or whether or not position information is supplied from the display / input panel 61 of the operation unit 60 based on a user's operation. You may make it determine.

  Further, in the inkjet printing apparatus 1 according to an embodiment of the present invention, when one of the divided area 502 or area 503 displayed on the display / input panel 61 is designated by a user operation, the control unit The conveyance schedule generation unit 70c of 70 sets a region where the coefficient of friction in the envelope is low, but is not limited to the display / input panel 61 as an external input means.

  For example, a sensor that directly detects the friction coefficient of the envelope Z is provided, and the conveyance schedule generation unit 70c of the control unit 70 sets an area where the friction coefficient in the envelope is low based on the friction coefficient detected by the sensor. It may be.

<Generation of high-speed transfer schedule>
Next, generation of the high-speed conveyance schedule in step S121 of the flowchart of FIG. 3 will be described in detail.

  FIG. 5A is a diagram illustrating generation of a high-speed conveyance schedule for a surface in the inkjet printing apparatus 1 according to an embodiment of the present invention, and FIG. 5B is a diagram according to an embodiment of the present invention. In the inkjet printing apparatus 1, it is a figure explaining the production | generation of the high-speed conveyance schedule of a back surface. Here, a case where the sheet is accelerated and conveyed by the secondary paper feeding unit 14 that is one of the acceleration conveyance rollers will be described, but the same applies to the conveyance roller 138 and the reverse roller 52 that are other acceleration conveyance rollers.

  As shown to Fig.5 (a), the window part 201 is provided in the envelope main-body part 202 on the surface of the envelope Z. As shown in FIG. The window 201 is made of a transparent material such as a transparent film so that the address written on the paper to be included can be visually recognized. Therefore, the friction coefficient of the window part 201 is lower than the friction coefficient of the envelope main body part 202, and the conveyance roller easily slips.

  Therefore, in the inkjet printing apparatus 1 according to an embodiment of the present invention, when the surface of the envelope Z is transported as the drive roller side of the secondary paper feed unit 14, the transport schedule generation unit 70c has the drive roller as a window portion. While in pressure contact with 201, the secondary paper feeding unit 14 stops the accelerated conveyance of the envelope Z and generates a high-speed conveyance schedule so that the envelope Z is conveyed at a constant speed.

  The speed 101 in the upper diagram of FIG. 5A indicates the speed of the drive roller (the number of rotations per unit time) when the acceleration is accelerated at the constant acceleration a1, regardless of the presence or absence of the window 201. The speed 102 indicates the speed of the driving roller of the secondary paper feeding unit 14 provided in the inkjet printing apparatus 1 according to the embodiment of the present invention.

  As indicated by the speed 101 in the upper diagram of FIG. 5A, when the driving roller of the secondary paper feed unit 14 is accelerated and conveyed at a constant acceleration a1 from time t0, the secondary paper feed unit 14 is obtained at time t5. It can be seen that the conveyance of the envelope Z is completed. This time t5 is referred to as a conveyance end time.

  As shown at the speed 102 in the upper diagram of FIG. 5A, in the inkjet printing apparatus 1 according to the embodiment of the present invention, the transport schedule generation unit 70c performs the secondary paper feeding unit 14 from the time t0 to the time t1. A high-speed conveyance schedule is generated so that the drive roller is accelerated and conveyed at an equal acceleration of acceleration a1.

  Then, the conveyance schedule generation unit 70c switches the driving roller of the secondary sheet feeding unit 14 from the accelerated conveyance to the constant velocity conveyance at the time point t1, completes the switching at the time point t2, and the secondary sheet feeding unit after the time point t2. A high-speed conveyance schedule is generated so that the fourteen drive rollers are conveyed at a constant speed.

  Next, the conveyance schedule generation unit 70c switches the driving roller of the secondary sheet feeding unit 14 from constant speed conveyance to accelerated conveyance at time t3, completes the switching at time t4, and performs secondary paper feeding after time t4. A high-speed conveyance schedule is generated so that the driving roller of the unit 14 is accelerated and conveyed at an equal acceleration of acceleration a2. Here, the acceleration a2 is calculated as an acceleration at which the conveyance of the envelope Z is completed at the time t5, which is the conveyance end time, when the acceleration conveyance is resumed at the time t3.

  In this way, when the surface of the envelope Z is conveyed on the side of the driving roller of the secondary paper feeding unit 14, the conveyance schedule generating unit 70 c performs secondary processing while the driving roller is in pressure contact with the window 201. Accelerate again the envelope Z after the passage of the window 201 of the envelope Z has passed the drive roller so that the feeding of the envelope Z is stopped at the constant speed by stopping the accelerated conveyance of the envelope Z at the time t5. An acceleration a2 for carrying is calculated, and a high-speed carrying schedule is generated so that the secondary paper feeding unit 14 accelerates and carries the envelope Z at the calculated acceleration a2.

  Further, as shown in FIG. 5B, the back surface of the envelope Z is provided with an adhesive main body 202 and an adhesive release paper portion 203. The adhesive release paper portion 203 is made of a material that has a glossy surface and is easily peeled off. Therefore, the friction coefficient of the glue release paper portion 203 is lower than the friction coefficient of the envelope main body portion 202 and is easily slipped by the conveying roller.

  Therefore, when the back surface of the envelope Z is conveyed on the side of the driving roller of the secondary paper feeding unit 14, the conveyance schedule generating unit 70 c presses the driving roller against the glue release paper unit 203. In the meantime, the high-speed conveyance schedule is generated so that the secondary sheet feeding unit 14 stops the accelerated conveyance of the envelope Z and conveys it at a constant speed.

  When the speed 101 in the upper diagram of FIG. 5B is accelerated at a constant acceleration of acceleration a1, regardless of the presence or absence of the glue release paper portion 203, similarly to the speed 101 in the upper diagram of FIG. The driving roller speed (the number of rotations per unit time) is shown in FIG. 5B, and the speed 103 shown in the upper part of FIG. The speed of 14 drive rollers is shown.

  As indicated by the speed 103 in the upper diagram of FIG. 5B, in the inkjet printing apparatus 1 according to the embodiment of the present invention, the conveyance schedule generation unit 70c performs the secondary sheet feeding unit 14 from the time t0 to the time t11. A high-speed conveyance schedule is generated so that the drive roller is accelerated and conveyed at an equal acceleration of acceleration a1.

  Then, at time t11, the conveyance schedule generation unit 70c switches the driving roller of the secondary paper feeding unit 14 from accelerated conveyance to constant speed conveyance, and after time t11, the driving roller of the secondary paper feeding unit 14 is conveyed at constant speed. To generate a high-speed transport schedule.

  Next, at time t12, the conveyance schedule generation unit 70c switches the driving roller of the secondary paper feeding unit 14 from constant speed conveyance to accelerated conveyance, and after time t12, the driving roller of the secondary paper feeding unit 14 has an acceleration a3. A high-speed conveyance schedule is generated so as to accelerate and convey at a constant acceleration. Here, the acceleration a3 is calculated as an acceleration at which the conveyance of the envelope Z is completed at the time t5, which is the conveyance end time, when the acceleration conveyance is resumed at the time t12.

  In this way, when the back surface of the envelope Z is transported as the drive roller side of the secondary paper feed unit 14, the transport schedule generation unit 70c is in contact with the adhesive release paper unit 203 while the drive roller is in pressure contact. The secondary paper feed unit 14 stops the accelerated conveyance of the envelope Z and conveys it at a constant speed. As a result, even when the envelope Z including the window or the adhesive release paper is conveyed, printing can be appropriately performed without being obliquely conveyed or peeled off.

  Moreover, the conveyance schedule generation part 70c calculates the acceleration a3 for carrying out the acceleration conveyance again after the glue peeling paper part 203 of the envelope Z passes a drive roller so that conveyance of the envelope Z is complete | finished at the time t5. A high-speed conveyance schedule is generated so that the secondary sheet feeding unit 14 accelerates and conveys the envelope Z at the calculated acceleration a3. Thereby, since the conveyance can be completed at the time t5, it is possible to ensure the same productivity as when the conveyance roller is accelerated and conveyed at the equal acceleration of the acceleration a1 from the time t0.

<Generation of low-speed transfer schedule>
Next, the generation of the low speed conveyance schedule in step S123 of the flowchart of FIG. 3 will be described in detail.

  FIG. 6 is a diagram illustrating generation of a low-speed conveyance schedule on the surface of an envelope in the inkjet printing apparatus 1 according to an embodiment of the present invention. Here, a description will be given of a case where the sheet is accelerated and conveyed by the secondary sheet feeding unit 14 which is one of the acceleration conveyance rollers.

  As shown by the speed 102 in FIG. 6, the high-speed transport schedule for the surface is generated so that the envelope Z is accelerated and transported at an acceleration a2 so that the transport is completed at time t5 after t3.

  On the other hand, as indicated by speed 301, the low-speed transport schedule on the surface is generated so that the driving roller of the secondary paper feed unit 14 is accelerated and transported at an equal acceleration of acceleration a1, after time t3, similarly to speed 101.

  Thereby, even when the envelope body 202 of the envelope Z is made of a relatively soft material, the envelope body 202 can be appropriately printed without causing wrinkles.

  Further, as indicated by a speed 302, a low-speed transport schedule is generated so that the driving roller of the secondary sheet feeding unit 14 is accelerated and transported at an acceleration a4 lower than the acceleration a1 from the time t0 to the time t1 and after t3. May be. In this case, even when printing on the envelope Z made of a softer material, printing can be performed appropriately.

  The conveyance schedule generation unit 70c generates the high-speed conveyance schedule and the low-speed conveyance schedule so that the driving roller of the secondary sheet feeding unit 14 conveys at a constant speed from the time point t1 to the time point t3. However, the present invention is not limited to this. .

  FIG. 7 illustrates the generation of the high-speed transfer schedule and the low-speed transfer schedule on the envelope surface when the drive roller is decelerated while being pressed against the window 201 in the inkjet printing apparatus 1 according to an embodiment of the present invention. FIG.

  As shown in FIG. 7, the speed 401 causes the secondary sheet feeding unit 14 to stop the accelerated conveyance of the envelope Z from the time t1 to the time t3, that is, while the driving roller is pressed against the window 201. ing. During this time, the drive roller of the secondary paper feeding unit 14 is in an unloaded state, but the speed from the time point t1 to the time point t3 may decrease due to some resistance such as friction.

  Therefore, the transfer schedule generation unit 70c may generate a high-speed transfer schedule indicated by the speed 401 and a low-speed transfer schedule indicated by the speed 402 in consideration of the speed reduction from the time t1 to the time t3. Good.

  Accordingly, even when the speed of the driving roller is reduced while the driving roller is in a no-load state, printing can be appropriately performed.

  In the inkjet printing apparatus 1 according to an embodiment of the present invention, the case where the print medium W is the envelope Z has been described as an example. However, the print paper W is not limited to the envelope Z, and an area having a low coefficient of friction is included. Any print medium may be used.

  Further, in one embodiment of the present invention, the drive roller 14a that rotates and the driven roller 14b that rotates by being pressed against the drive roller 14a are provided, and the rotation speed of the drive roller 14a is increased with the envelope Z interposed therebetween. The inkjet printing apparatus 1 that accelerates and conveys the envelope Z by rotating while being described as an example, but is not limited thereto.

  For example, instead of the driven roller 14b, a belt that rotates by being in pressure contact with the driving roller 14a may be provided as the opposing member.

  The inkjet printing apparatus 1 according to an embodiment of the present invention has been described by taking an inkjet line color printer that performs printing in line units as an example. However, the present invention is not limited to this, and laser or toner printing. It may be a device.

DESCRIPTION OF SYMBOLS 1 ... Inkjet printer 2 ... Image taking-in part 3 ... Image forming apparatus 10 ... Side paper feed part 14 ... Secondary paper feed part 14a ... Drive roller (roller)
14b ... driven roller (opposing member)
DESCRIPTION OF SYMBOLS 20 ... Internal paper feeding part 30 ... Printing part 40 ... 1st discharge part 50 ... Inversion part 52 ... Inversion roller 60 ... Operation part 61 ... Display / input panel 70 ... Control part 70a ... Reception part 70b ... Determination part 70c ... Conveyance Schedule generation unit 70d ... device control unit 80 ... second paper discharge unit 83 ... RAM
DESCRIPTION OF SYMBOLS 91 ... Network interface part 92 ... External interface part 133 ... Paper conveyance unit 135 ... Paper sensor 137,138,139 ... Conveyance roller 138a ... Drive roller (roller)
138b ... driven roller (opposing member)
201 ... Window portion 202 ... Envelope body portion 203 ... Release paper portion

Claims (4)

A pair of a roller that rotates and a counter member that is driven in pressure contact with the roller are provided on the conveyance path, and the print medium is rotated by increasing the number of rotations of the roller while sandwiching the print medium. Conveying means for accelerated conveyance;
Region information with a low friction coefficient in the print medium is input, and based on the input region information, while the roller is in pressure contact with the region with a low friction coefficient of the print medium, Control means for stopping the accelerated conveyance of the print medium;
A printing apparatus comprising: The control means includes
Based on the position information, while the roller is in pressure contact with a region where the friction coefficient of the print medium is low, the rotation speed of the roller is rotated substantially constant while the print medium is sandwiched between the conveying means. The printing apparatus according to claim 1, wherein the printing medium is conveyed at a substantially constant speed. The control means includes
Calculating an acceleration for accelerating and conveying again after a region having a low friction coefficient of the printing medium passes through the roller, and causing the conveying means to convey the printing medium at the calculated acceleration. The printing apparatus according to claim 1, wherein the printing apparatus is a printer. The control means includes
A region where the friction coefficient of the print medium is low causes the roller to stop the conveyance of the print medium at the end of conveyance when the acceleration conveyance is carried at a substantially constant acceleration without stopping the acceleration conveyance. The printing apparatus according to claim 3, wherein after the passage, an acceleration for accelerating and conveying again is calculated, and the printing unit is caused to accelerate and convey the print medium at the calculated acceleration.

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