JP6065583B2 - Recording apparatus and program - Google Patents

Description

  The present invention relates to a recording apparatus that records an image on a recording medium and a program used therefor.

  A recording apparatus having a pressing member for pressing a recording medium toward a tray is known (see Patent Document 1, “paper discharge pressing member 6” corresponds to the pressing member). In Patent Document 1, the pressing member presses the rear end of the recording medium discharged to the tray. As a result, even if the recording medium is curled, the trailing end of the recording medium does not come into contact with the leading end of the recording medium that is subsequently discharged to the tray, and deterioration of the alignment of the recording medium in the tray is suppressed.

JP2003-2525111 (paragraph 0038 etc.)

  Japanese Patent Application Laid-Open No. 2004-228561 does not indicate the necessity of correcting the curl of the leading end portion of the recording medium. If the recording medium is discharged to the tray while the leading end portion of the recording medium is curled, the alignment of the recording medium in the tray may be deteriorated. Therefore, it is necessary to correct the curling of the leading end portion of the recording medium.

  The inventor of the present application has devised a configuration for correcting the curl of the front end portion of the recording medium using a pressing member. In this configuration, before the recording medium is discharged to the tray, a stop process is performed in which the conveying operation is temporarily stopped in a state where the pressing member is in contact with the leading end portion of the recording medium. By performing the stop process, the leading end portion of the recording medium is brazed and the curling of the leading end portion is corrected. The inventor of the present application has examined the effect of suppressing the deterioration of alignment by the configuration, and has found the following problems.

  Specifically, it has been found that if the above stop process is performed uniformly regardless of the degree of stiffness of the recording medium, the alignment may be deteriorated. For example, if the above stop process is performed on a recording medium having no waist, the leading end portion of the recording medium is excessively curved by the pressing force of the pressing member, and the leading end portion is supported by the tray or the tray when discharged to the tray. It has been found that the recording medium may be bent due to collision.

  An object of the present invention is to provide a recording apparatus and a program that can effectively suppress deterioration of the alignment of recording media in a tray by using a pressing member.

In order to achieve the above object, according to a first aspect of the present invention, a recording unit for recording an image on a recording medium, a tray from which a recording medium on which an image is recorded by the recording unit is discharged, and the tray A transport unit for transporting the recording medium on which the image is recorded by the recording unit toward the tray, and a recording medium sandwiched by the sandwiching member. A pressing member that extends in a direction intersecting with the discharging direction discharged toward the recording medium and that presses the recording medium held by the holding member toward the tray, and a control unit that controls the transport unit. The control unit includes a portion of the recording medium on the downstream side in the discharge direction with respect to the holding point of the recording medium with respect to the interval between the holding point of the recording medium by the holding member in the discharge direction and the pressing member. A first stop process for temporarily stopping the transport operation by the transport unit in the first state having a long length, and a second stop for temporarily stopping the transport operation in the second state in which the length of the recording medium is equal to or less than the interval. Ri executable der and processing, performs a first determination process of determining whether to perform one of the first stop process and the second stop treatment, in the first determination process, the basis weight of the recording medium is predetermined The basis weight of the recording medium is different from the predetermined direction, the size of the recording medium is larger than the predetermined size, or when the first stop processing of the recording medium is performed, When the number of dots in the end region arranged downstream of the discharge direction from the point is larger than a predetermined number, when the amount of the recording agent in the end region is larger than the predetermined amount, and environmental humidity Is higher than the specified humidity If, characterized in that it determines to execute the second stopping process when at least one of a recording apparatus is provided.

According to a second aspect of the present invention, a recording unit for recording an image on a recording medium, a tray from which the recording medium on which an image is recorded by the recording unit is discharged, and a recording medium to be discharged to the tray are sandwiched. A conveyance unit for conveying a recording medium on which an image is recorded by the recording unit toward the tray, and a discharge in which the recording medium held by the clamping member is discharged toward the tray. In a recording apparatus comprising: a pressing member that extends in a direction crossing the direction and that presses a recording medium that is sandwiched between the sandwiching members toward the tray; and a control unit that controls the transport unit. In the first state, the length of the portion of the recording medium on the downstream side in the discharge direction is longer than the interval between the holding point of the recording medium by the holding member in the discharge direction and the pressing member. The first stop process for temporarily stopping the transport operation by the transport unit, and the second stop process for temporarily stopping the transport operation in a second state in which the length of the recording medium is equal to or less than the interval, The control unit is caused to function , and further, a first determination process is performed to determine which of the first stop process and the second stop process is executed. In the first determination process, the basis weight of the recording medium is a predetermined weight. When the basis weight is smaller, when the direction of the eyes of the recording medium is different from the predetermined direction, when the size of the recording medium is larger than the predetermined size, when the first stop process of the recording medium is performed, the clamping point More than a predetermined number of dots in the end region arranged downstream of the discharge direction, when the amount of recording agent in the end region is greater than a predetermined amount, and environmental humidity is From a predetermined humidity Is higher, the so it determines to execute the second stopping process when at least one, and wherein the Rukoto to function the control unit, a program is provided.

  According to the first and second aspects, it is possible to effectively correct the curl of the leading end portion (the end portion on the downstream side in the discharge direction) of the recording medium by the first stop process. By the second stop process, bending of the recording medium discharged to the tray can be suppressed. As described above, the control unit can execute the first stop process and the second stop process instead of uniformly performing the first stop process, and thereby the alignment of the recording medium in the tray using the pressing member. Can be effectively suppressed.

  In the second stop process, the length of the recording medium is less than the interval, and the pressing member does not have to contact the recording medium. In this case, it is possible to more reliably suppress the bending of the recording medium discharged to the tray.

  The control unit determines whether the basis weight of the recording medium is smaller than the predetermined basis weight, whether the eye direction of the recording medium is different from the predetermined direction, and the size of the recording medium is larger than the predetermined size. , Whether the number of dots in the end region is larger than the predetermined number, whether the amount of the recording agent in the end region is larger than the predetermined amount, and the environment A derivation process for deriving an evaluation value according to at least one of whether or not the humidity is higher than the predetermined humidity is performed. In the first determination process, when the evaluation value is less than a reference value, the first value It may be determined that stop processing is to be executed, and if the evaluation value is equal to or greater than the reference value, it may be determined that the second stop processing is to be executed.

  The controller performs a second determination process for determining whether an image is recorded on both the first surface of the recording medium and the second surface opposite to the first surface, and the second When it is determined in the determination process that images are recorded on both surfaces, the number of dots in the edge region and the amount of the recording agent in the edge region for both surfaces are based Then, the first determination process may be performed. Thereby, it is possible to appropriately cope with double-sided recording.

  The transport unit includes a first transport unit for transporting a recording medium toward an opposing position facing the recording unit, a reversing unit for reversing the transport direction of the recording medium transported by the first transport unit, And a second transport unit for transporting the recording medium whose transport direction is reversed by the reversing unit toward the facing position, and the control unit performs the first stop process before performing the second stop process. By reversing the transport direction of the recording medium transported by the transport unit by the reversing unit, a reversing process for arranging at least a part of the recording medium on the transport path by the second transport unit may be performed. In this case, the recording medium can be prevented from coming into contact with the recording unit during the second stop process. Further, the recording apparatus can be reduced in size as compared with the case where a recording medium arrangement area is provided separately during the second stop process. That is, according to the above configuration, the recording medium can be prevented from coming into contact with the recording unit while suppressing an increase in the size of the recording apparatus.

  In the recording apparatus according to the present invention, a recording medium on which an image is recorded by the recording unit is discharged, and a detachable tray different from the tray is detachable, and the transport unit is located at a position facing the recording unit. A third transport unit that transports a recording medium along a first transport path that extends to the clamping member, and a recording along a second transport path that is longer than the first transport path from the facing position toward the detachable tray. The recording apparatus according to the present invention includes a fourth transport unit that transports the medium, and guides the recording medium on which an image is recorded by the recording unit to either the first transport path or the second transport path. A guide unit may be further provided, and the control unit may perform a guide process for controlling the guide unit to guide the recording medium to the second transport path before performing the second stop process. In this case, the recording medium can be prevented from coming into contact with the recording unit during the second stop process.

  While the second stop process is performed, the recording medium may be sandwiched between the sandwiching members. In this case, the curl suppressing effect and the jam suppressing effect at the front end portion of the recording medium can be reliably obtained.

  The transport unit transports a recording medium along a first transport path extending from an opposing position facing the recording unit to the clamping member, and the length of the first transport path is recorded in the transport direction by the transport unit. It may be shorter than the length of the medium. In this case, downsizing of the device is realized. In addition, when the first transport path is relatively short as described above, the rear end of the recording medium is located downstream in the transport direction from the opposing position in order to avoid the recording medium from contacting the recording unit during the stop process. If the stop process is performed in the disposed state, the leading end portion of the recording medium naturally protrudes to the downstream side in the ejection direction from the clamping member, and the leading end portion of the recording medium may be excessively curved by the pressing force of the pressing member. . However, according to the present invention, the problem can be reduced.

  The control unit executes either the first stop process or the second stop process after an end on the upstream side in the transport direction of the recording medium by the transport unit passes through a facing position facing the recording unit. You can do it. In this case, it is possible to avoid the recording medium coming into contact with the recording unit during each stop process.

  The recording unit may have an ejection surface on which a plurality of ejection ports for ejecting liquid are formed. When recording is performed using a liquid in this way, the moisture content of the recording medium increases and the recording medium is likely to curl. However, according to the present invention, curling can be effectively corrected.

  According to the present invention, since the control unit can execute the first stop process and the second stop process instead of uniformly performing the first stop process, the recording medium is aligned in the tray using the pressing member. The deterioration of sex can be effectively suppressed.

1 is a side view showing the inside of an ink jet printer according to an embodiment of the present invention. It is a perspective view which shows a press part. FIG. 10 is a side view showing a state in which the first arm swings according to the amount of paper supported by the tray. FIG. 2 is a block diagram illustrating an electrical configuration of a printer. It is a flowchart which shows the main routine which the main controller of a printer performs. It is a flowchart which shows the stop process selection routine of FIG. (A) is a figure which shows the block defined in the paper. (B) is a figure which shows the evaluation area | region defined on the paper. (A) is an example of a table used for deriving an evaluation value. (B) is an example of a table indicating reference values. It is a graph which shows an example of the liquid-curl correlation information in an evaluation area. It is a side view which shows the state in which the 1st stop process is performed. It is a side view which shows the state in which the 2nd stop process is performed after the inversion process. It is a side view which shows the state in which the 2nd stop process is performed after the guidance process.

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

  First, the overall configuration of an ink jet printer 100 according to an embodiment of the present invention will be described.

  As shown in FIG. 1, the printer 100 includes a main body 101 and a removable paper discharge unit 90. The detachable paper discharge unit 90 is disposed on the upper portion of the main body 101 and is detachable from the main body 101.

  The main body 101 has a rectangular parallelepiped housing 101a. A main body tray 4 is provided on the top of the casing 101a. In addition, a discharge port 101a1 for discharging the paper P to the main body tray 4 is formed in the upper part of the housing 101a. A pressing portion 40 is provided in the vicinity of the discharge port 101a1 in the housing 101a. A main controller 150, the inkjet head 1, the platen 6, the humidity sensor 70S, the transport unit 50, and the paper feed tray 2 are accommodated in the internal space of the housing 101a. In the internal space of the housing 101a, a conveyance path for the paper P is formed from the paper feed tray 2 toward the main body tray 4 as indicated by a thick arrow in FIG.

  The housing 101a is detachably provided with a cartridge (not shown) that stores black ink supplied to the head 1 (hereinafter, black ink may be referred to as “liquid”). The cartridge is connected to the head 1 via a tube or the like and supplies liquid to the head 1.

  The head 1 is a line head having a substantially rectangular parallelepiped shape elongated in the main scanning direction (direction perpendicular to the paper surface of FIG. 1). The lower surface of the head 1 is an ejection surface 1a in which a plurality of ejection ports for ejecting liquid are formed. Inside the head 1, a flow path is formed from the liquid supplied from the cartridge to the discharge port. The head 1 is supported by the housing 101 a via the holder 5. The holder 5 supports the head 1 so that a predetermined gap suitable for recording is formed between the ejection surface 1 a and the surface of the platen 6.

  The platen 6 is a flat plate member and is disposed at a position (opposite position) facing the ejection surface 1a in the vertical direction.

  The humidity sensor 70 </ b> S is disposed in the vicinity of the head 1 and outputs a signal indicating the environmental humidity to the main controller 150.

  The transport unit 50 includes an upstream transport unit 50a, a downstream transport unit 50b, and a re-transport unit 50c. The conveying units 50a and 50b are arranged with the platen 6 interposed therebetween. The upstream conveying unit 50a is upstream of the platen 6 in the conveying direction (the conveying direction of the paper P by the conveying unit 50), and the downstream conveying unit 50b is the platen. It is arranged downstream of 6 in the transport direction. The upstream transport unit 50a transports the paper P toward the facing position so that the surface of the paper P (the surface facing downward in the paper feed tray 2) faces the ejection surface 1a. The downstream conveyance unit 50b and the reconveying unit 50c convey the paper P on which the image is recorded on the front surface toward the opposite position so that the back surface opposite to the front surface of the paper P faces the ejection surface 1a. The facing position is a position facing the ejection surface 1 a on the platen 6 and is a position where an image is recorded by the head 1.

  The upstream side conveyance unit 50a includes a paper feed roller 21, a pair of rollers 22, 23, and guides 31b and 31c, and defines a path extending from the paper feed roller 21 to a facing position. The downstream transport unit 50b includes roller pairs 24 to 26 and guides 32a to 32c, and defines a path R1 and an upstream portion of the path R2. The path R1 is a path extending from the facing position to the roller pair 26. The path R <b> 2 is a path extending from the facing position toward the detachable tray 94 to the roller pair 96. The re-conveying unit 50c includes a re-conveying cassette 30, roller pairs 27 and 28, and guides 33a to 33c.

  Note that the printer 100 of the present embodiment is capable of recording on paper P of three types of sizes, letter, A4, and legal. The length of the path R1 in the transport direction is shorter than the legal length having the largest length in the longitudinal direction among the three types. The route R2 is longer than the route R1 with respect to the transport direction.

  Under the control of the main controller 150, the paper feed roller 21 is rotated by driving a paper feed motor 21 </ b> M (see FIG. 4), and sends out the uppermost paper P in the paper feed tray 2.

  One roller of each of the roller pairs 22 to 28 is a driving roller that is rotated by driving of the transport motor 50M (see FIG. 4) under the control of the main controller 150. The other roller of each of the roller pairs 22 to 28 is a driven roller that rotates as the one roller rotates. In each of the roller pairs 22 to 28, one roller and the other roller rotate in opposite directions while sandwiching the paper P. As a result, the paper P is transported in the transport direction.

  The guide 31 b extends from the paper feed roller 21 to the roller pair 22. The guide 31 c extends from the roller pair 22 to the roller pair 23. The guide 32 a extends from the roller pair 24 to the roller pair 25. The guide 32 b extends from the roller pair 25 to the paper discharge port 107. The guide 32c extends from the middle part of the guide 32b to the roller pair 26. The guide 33a extends from the middle part of the guide 32a to the roller pair 27. The guide 33b extends from the roller pair 27 to the re-conveying cassette 30. The guide 33c extends from the roller pair 28 to an intermediate portion of the guide 31c. Each guide 31b, 31c, 32a-32c, 33a-33c consists of a pair of plates spaced apart from each other in the surface direction.

  A guide portion 20 is disposed at a connection portion between the guides 32b and 32c. The guide unit 20 includes a swinging member 20a that can swing around a shaft 20a1, and a drive unit 20b (see FIG. 4) that drives the swinging member 20a. Under the control of the main controller 150, the drive unit 20b drives the swing member 20a, so that the swing member 20a is in the first position when the paper P is discharged to the main body tray 4 (FIGS. 1, 10, and 11), when the paper P is discharged to the detachable tray 94, it is disposed in the second position (a position extending from the shaft 20a1 and closing the connection portion of the guide 32b with the guide 32c: see FIG. 12). The The guide unit 20 is positioned at the first position by a spring (not shown). Thereby, the transport path of the paper P is switched. That is, the guide unit 20 has a function of guiding the paper P on which an image is recorded to one of the routes R1 and R2.

  The re-conveying cassette 30 is disposed above the sheet feeding tray 2 and below the platen 6.

  A support plate 4 a that supports the paper P is provided at the bottom of the main body tray 4. The support plate 4a is composed of an upper wall of the housing 101a, is inclined with respect to the horizontal plane, and is a direction in which the paper P sandwiched between the roller pair 26 is discharged toward the main body tray 4 (hereinafter referred to as “discharge direction”). .) Ascending toward the downstream side of X. The discharge direction X passes through the common tangent of the two rollers constituting the roller pair 26.

  The sheet feed tray 2 can accommodate a plurality of sheets P and is detachable from the housing 101a.

  A connector 103 is provided on the top plate of the housing 101a. By connecting the connector 103 and the connector 98 of the removable paper discharge unit 90, the main controller 150 can communicate with the paper discharge controller 180 of the removable paper discharge unit 90.

  The detachable paper discharge unit 90 has a housing 91. The housing 91 includes a main body portion 91a and a protruding portion 91b. The main body 91a is a part that is attached to the top plate of the housing 101a, and houses the transport unit 92 and the paper discharge controller 180. The protruding portion 91b is a portion protruding to the left in FIG. 1 from the main body portion 91a, and a detachable tray 94 is provided. In addition, a discharge port 91a1 for discharging the paper P to the detachable tray 94 is formed in the upper part of the main body 91a. A pressing portion 40 is provided in the vicinity of the discharge port 91a1 in the main body portion 91a. The pressing portion 40 provided for the detachable tray 94 and the pressing portion 40 provided for the main body tray 4 have the same configuration.

  The conveyance unit 92 includes a pair of rollers 95 and 96 and guides 99a to 99c, and defines a downstream portion of the path R2. That is, the path R2 is defined by the downstream side transport unit 50b and the transport unit 92. One roller of each of the roller pairs 95 and 96 is a driving roller that is rotated by driving of the transport motor 92M (see FIG. 4) under the control of the paper discharge controller 180. The other roller of each roller pair 95, 96 is a driven roller that rotates as the one roller rotates. In each of the roller pairs 95 and 96, one roller and the other roller rotate in opposite directions while sandwiching the paper P. As a result, the paper P is transported in the transport direction. The guide 99a extends from the paper feed port 91c to the roller pair 95. The guide 99b extends from the roller pair 95 to the paper discharge port 91e. The guide 99c extends from the middle part of the guide 99b to the roller pair 96. Each of the guides 99a to 99c includes a pair of plates that are spaced apart from each other in the surface direction. The paper feed port 91c is opened on the lower surface of the bottom plate of the main body 91a, and the paper discharge port 91e is opened on the upper surface of the top plate of the main body 91a.

  A guide portion 120 is disposed at a connection portion between the guides 99b and 99c. The guide unit 120 has the same configuration as the guide unit 20, and includes a swing member 120a that can swing around a shaft 120a1, and a drive unit 120b (see FIG. 4) that drives the swing member 120a. The drive unit 120b drives the swing member 120a under the control of the paper discharge controller 180, so that the swing member 120a is in the first position (see FIG. 1) when discharging the paper P to the detachable tray 94. When discharging P to the detachable tray 94 of the other detachable paper discharge unit 90, the second position (a position extending from the shaft 120a1 and closing the connecting portion of the guide 99b with the guide 99c: swing of FIG. 12) (See member 20a). Thereby, the transport path of the paper P is switched.

  The paper discharge controller 180 controls the transport motor 92M and the drive unit 120b based on a command from the main controller 150.

  The detachable tray 94 has the same configuration as the main body tray 4. That is, a support plate 94 a that supports the paper P is provided at the bottom of the detachable tray 94. The support plate 94a is composed of the upper wall of the protruding portion 91b, is inclined with respect to the horizontal plane, and the direction in which the paper P sandwiched between the roller pair 96 is discharged toward the detachable tray 94 (the discharge direction related to the roller pair 26). The same direction, hereinafter referred to as “discharge direction.”) Ascending toward the downstream side of X. The discharge direction X passes through the common tangent of the two rollers constituting the roller pair 96.

  A connector 97 is provided on the top plate of the main body 91a. A connector 98 is provided on the bottom plate of the main body portion 91a. The connectors 97 and 98 are disposed at positions that coincide with the connector 103 when viewed from the vertical direction. The connector 97 can be connected to a connector 98 of another removable paper discharge unit 90. The connector 98 can be connected to either the connector 103 or the connector 97 of another removable paper discharge unit 90. By connecting the connector 97 and the connector 98 of the other removable paper discharge unit 90, the main controller 150 can communicate with the paper discharge controller 180 of the other removable paper discharge unit 90. That is, in the present embodiment, only one removable paper discharge unit 90 is attached to the main body 101, but a plurality of removable paper discharge units 90 can be attached to the main body 101. A plurality of detachable paper discharge units 90 attached to the main body 101 are arranged in series in the vertical direction at the top of the main body 101.

  Next, the pressing unit 40 will be described.

  As shown in FIG. 2, the pressing unit 40 includes a shaft 40 x, a first arm 41, a second arm 42, and a third arm 43. A full load sensor 43 </ b> S is attached to the third arm 43. The shaft 40x has a cylindrical shape and extends in the main scanning direction (direction intersecting the discharge direction X). The first arm 41 includes one center arm 41a and two side arms 41b (hereinafter, these three arms 41a and 41b may be collectively referred to as the first arm 41). Each arm 41a, 41b, 42, 43 is an elongated plate-like member, and protrudes from the shaft 40x so that the plate surface extends in the main scanning direction. The arms 41a, 41b, 42, and 43 swing together around the shaft 40x as the shaft 40x rotates.

  The center arm 41a is disposed at the center of the axis 40x in the main scanning direction. The pair of side arms 41b are positions spaced apart from the center in the main scanning direction of the shaft 40x toward one end and the other end of the shaft 40x, and are in contact with one end and the other end of the paper P in the width direction. In place. The second arm 42 and the third arm 43 are disposed in the vicinity of one end and the other end of the shaft 40x in the main scanning direction, respectively.

  The center arm 41a and the pair of side arms 41b protrude from the shaft 40x in the same direction. The second arm 42 and the third arm 43 protrude from the shaft 40x in the same direction. The arms 41a and 41b constituting the first arm 41, the second arm 42, and the third arm 43 have different projecting directions from the shaft 40x.

  Of the arms 41a, 41b, 42, and 43, the projecting length from the shaft 40x is the longest at the center arm 41a, the longest at the side arm 41b, and the shortest at the second arm 42 and the third arm 43. The protruding lengths of the pair of side arms 41b from the shaft 40x are the same, and the protruding lengths of the second arm 42 and the third arm 43 from the shaft 40x are the same. The tip of the center arm 41a (the end opposite to the end fixed to the shaft 40x) is curved upward.

  Of the arms 41a, 41b, 42, 43, the arms 41a, 41b constituting the first arm 41 extend in a direction intersecting the discharge direction X, and the paper P sandwiched between the roller pair 26 or 96 is trayed. Press toward 4 or 94. That is, the first arm 41 has a function of suppressing deterioration of the alignment of the paper P in the tray 4 or 94. In particular, the pair of side arms 41 b can contact one end and the other end of the paper P in the width direction, and has a function of correcting the curl of the paper P.

  The first arm 41 swings according to the amount of paper P supported by the tray 4 or 94 (see FIG. 3: FIG. 3 shows a pressing portion 40 provided for the main body tray 4. However, the same applies to the pressing portion 40 provided for the detachable tray 94).

  In FIG. 3, only the center arm 41a is shown among the arms 41a and 41b constituting the first arm 41, but the pair of side arms 41b also protrude from the shaft 40x in the same direction as the center arm 41a. .

  The first arm 41 contacts the uppermost sheet P on the support plate 4a or 94a when a predetermined amount of the sheet P is supported on the tray 4 or 94, and when the sheet P is further discharged, the support plate 4a. Or, it swings in the direction of arrow Y about the axis 40x while contacting the uppermost sheet P on 94a. In FIG. 3, the broken line indicates the initial position of the first arm 41, and the solid line indicates the position of the first arm 41 when the maximum amount of paper P is supported on the tray 4 or 94.

  The full sensor 43S has a light emitting unit and a light receiving unit disposed opposite to the light emitting unit, and outputs an ON signal when the light receiving unit receives light emitted from the light emitting unit, and an OFF signal when the light receiving unit does not receive light. 150. When the first arm 41 is in the initial position (the position indicated by the broken line in FIG. 3), the light emitted from the light emitting unit is blocked by the third arm 43 and is not received by the light receiving unit. Output. When the first arm 41 is at the position indicated by the solid line in FIG. 3, the light emitted from the light emitting unit is received by the light receiving unit without being blocked by the third arm 43, so the full load sensor 43 </ b> S outputs an ON signal. To do. When the main controller 150 receives an ON signal from the full load sensor 43S for a predetermined time or more, it determines that the maximum amount of paper P is supported on the tray 4 or 94.

  Further, the first arm 41 is pushed up by the paper P when the paper P is discharged to the tray 4 or 94, and moves upward from the position indicated by the solid line in FIG. At this time, the sheet P conveyed toward the tray 4 or 94 while being sandwiched between the roller pair 26 or 96 comes into contact with the first arm 41 and pushes up the first arm 41. After the paper P contacts the first arm 41 and pushes up the first arm 41, the paper P moves while sliding on the support plate 4a or 94a or the paper P supported by the support plate 4a or 94a. When it comes into contact with the side surface defining the tray 4 or 94 in the 101a or the main body portion 91a, it stops.

  Next, the controllers 150 and 180 will be described.

  Each of the controllers 150 and 180 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory: including a nonvolatile RAM), an I / F (Interface), and an I / O (Input / Output Port). Etc. The ROM stores programs executed by the CPU, various fixed data, and the like. The RAM temporarily stores data (image data and the like) necessary for executing the program. The I / F of the main controller 150 performs data transmission / reception with an external apparatus (such as a PC connected to the printer 100) 500, and the I / F of the paper discharge controller 180 performs data transmission / reception with the main controller 150. I / O inputs / outputs detection signals of various sensors. The main controller 150 further includes an application specific integrated circuit (ASIC). In the ASIC, image data is rewritten and rearranged (for example, signal processing and image processing). Note that the main controller 150 may not include the ASIC, and image data may be rewritten, rearranged, or the like by a program executed by the CPU.

  A program stored in a storage medium such as a flexible disk, a CD-ROM, or a memory card is installed in the ROM of the main controller 150 and executed by the CPU of the main controller 150, whereby each function unit 150a to 150a of the main controller 150 is executed. 150c (see FIG. 4) is realized. The functional units 150a to 150c will be described in the description regarding the control contents executed by the main controller 150 described below.

  Next, control contents executed by the main controller 150 will be described.

  First, as shown in FIG. 5, the main controller 150 determines whether or not a recording command has been received from the external device 500 (F1). When the main controller 150 has not received the recording command (F1: NO), the main controller 150 repeats the step F1. When the main controller 150 receives a recording command (F1: YES), the data included in the recording command (image data, data indicating the basis weight (thickness) of the paper P, data indicating the eye direction of the paper P, The data indicating the size of the paper P and the environmental humidity data indicated by the signal received from the humidity sensor 70S are stored in the RAM (F2). The data included in the recording command is different for each paper P.

  Thereafter, the main controller 150 executes a stop process selection routine (first determination process) shown in FIG. 6 for each sheet P (F3).

  In the stop process selection routine, first, the discharge data generation unit 150a of the main controller 150 generates discharge data based on the image data stored in the RAM (S1). The generated ejection data is stored in the RAM.

  The ejection data indicates the number and size of dots ejected to each of the plurality of unit regions U (see FIG. 7A). The unit area U is an area virtually defined on the paper P. In the present embodiment, the resolution is 600 dpi in each of the longitudinal direction and the width direction of the paper P, and the unit area U is 1/600 inch in each of the longitudinal direction and the width direction of the paper P. It is a grid-like area divided at intervals. In this embodiment, there are five types of dot sizes: zero (0 pl), small (4 pl), medium (7 pl), large (14 pl), and extra large (21 pl). The longitudinal direction of the paper P is parallel to the transport direction.

  After S1, the liquid count unit 150b of the main controller 150 calculates the number of dots and the amount of liquid ejected to each of the plurality of blocks B (see FIG. 7A) (S2). The calculated data is stored in the RAM.

  The block B is an area virtually defined on the paper P, and each block B includes a plurality of unit areas U. In the present embodiment, a total of 64 blocks B are formed on one sheet of paper P by dividing the sheet P into 8 rows in the longitudinal direction and 8 columns in the width direction.

  In S2, the liquid counting unit 150b refers to the ejection data generated in S1, and calculates the number of dots and the amount of liquid in each block B. Specifically, the liquid count unit 150b calculates the number of dots in each block B by totaling the number of dots in the unit area U included in each block B. In addition, the liquid count unit 150b calculates the liquid amount of each block B by summing the number of dots for each size of the unit area U included in each block B multiplied by the amount corresponding to the size. To do.

  The unit area U and the block B are defined on the front surface and the back surface of the paper P, respectively.

  In order to change the amount of liquid ejected to the unit region U, there are cases where a single droplet of a certain size is ejected, a plurality of dots of the same size are ejected continuously, and the like. In the latter case, the number of dots is actually plural, but is counted as one. In this embodiment, only one type of liquid (black ink) is ejected onto the paper P, but different types of liquid (for example, black ink and pretreatment liquid, black ink and yellow ink, etc.) are used on the paper. When discharged to P, calculation is performed as follows. That is, in calculating the number of dots, when different types of liquid are ejected to the same unit region U, the number of dots in the unit region U is counted as one. On the other hand, in calculating the liquid amount, the amounts of the different types of liquids are summed up.

  After S2, the main controller 150 performs a second determination process for determining whether or not double-sided recording is performed based on the image data stored in the RAM (S3). When the main controller 150 determines that double-sided recording is not performed (that is, single-sided recording) (S3: NO), the main controller 150 sets the tip region of the surface Pa as the evaluation region Px (S4). When the main controller 150 determines that the double-sided recording is performed (S3: YES), the main controller 150 sets the rear end region of the front surface Pa and the front end region of the back surface Pb as the evaluation region Px (S5). That is, as shown in FIG. 7B, in the case of single-sided recording, there is one evaluation area Px, and in the case of double-sided recording, there are two evaluation areas Px.

  The evaluation area Px is an area virtually defined on the paper P, and is an end area arranged on the downstream side in the discharge direction X from the clamping point P1 when the first stop process of the paper P is performed. Yes (see FIG. 10). The pinching point P <b> 1 is a pinching point of the paper P by the roller pair 26. Specifically, in the case of single-sided recording in which an image is recorded on the front surface Pa of the paper P, the evaluation region Px is composed of the front end region of the front surface Pa, and the image is recorded on both the front surface Pa and the back surface Pb of the paper P. In the case of double-sided recording, it consists of a rear end region of the front surface Pa and a front end region of the back surface Pb. In the present embodiment, for the A4 size paper P, the leading edge area and the trailing edge area are both composed of blocks B of 2 rows × 8 columns.

  After S4 or S5, the liquid counting unit 150b calculates the number of dots and the amount of liquid ejected to the evaluation region Px (see FIG. 7B) set in S4 or S5 (S6). The calculated data is stored in the RAM.

  In S6, the liquid counting unit 150b refers to the data calculated in S2, and calculates the number of dots and the amount of liquid in the evaluation region Px. Specifically, the liquid count unit 150b calculates the number of dots in the evaluation region Px by adding up the number of dots in the block B included in the evaluation region Px. In addition, the liquid count unit 150b calculates the liquid amount in the evaluation region Px by totaling the liquid amount in the block B included in the evaluation region Px.

  After S6, the evaluation value deriving unit 150c of the main controller 150 derives an evaluation value (S7). The derived data is stored in the RAM.

  In S7, the evaluation value deriving unit 150c derives an evaluation value based on the table of FIG. Specifically, the evaluation value deriving unit 150c sets a setting value for each of the parameters (the number of dots / liquid amount in the evaluation area Px, the environmental humidity, and the size of the paper P) shown in the table of FIG. The evaluation value is derived by summing up the set values of all the parameters.

  For the number of dots and the amount of liquid in the evaluation region Px, set values are set based on the graph of FIG.

  The graph of FIG. 9 shows the correlation between the number of dots and the amount of liquid in the evaluation region Px and the set value. In the graph, the vertical axis represents the percentage of the number of dots in the evaluation area Px as a percentage. In the present embodiment, in the A4 size paper P, the resolution in each of the longitudinal direction and the width direction is 600 dpi, and the number of dots when the entire evaluation area Px is filled is 100%. In the graph, the horizontal axis represents the percentage of the liquid amount in the evaluation region Px as a percentage. In this embodiment, in the A4 size paper P, the resolution in each of the longitudinal direction and the width direction is set to 600 dpi, and the amount of liquid when the entire evaluation area Px is filled with large size (14 pl) dots is set to 100. % (Up to 200% when two kinds of liquids are used). The evaluation value deriving unit 150c obtains coordinates by applying the number of dots and the amount of liquid in the evaluation region Px calculated in S6 to the graph of FIG. 9, and obtains a setting value corresponding to the coordinates.

  In the case of double-sided recording, the evaluation value deriving unit 150c sets a setting value for each of the rear end region of the front surface Pa and the front end region (two evaluation regions Px) of the back surface Pb based on the graph of FIG.

  After S7, the main controller 150 determines whether or not the evaluation value is less than the reference value (S8). The reference value is derived based on the table in FIG. Specifically, numerical values corresponding to the parameters (the thickness of the paper P and the direction of the eyes of the paper P) in the table of FIG.

  The tables of FIGS. 8A and 8B and the information of FIG. 9 are stored in the ROM. These tables and information are created experimentally or theoretically.

  8A and 9, the set value is larger as the condition that the leading end portion of the paper P is easily curled. Specifically, the greater the number of dots in the evaluation area Px, the greater the amount of liquid in the evaluation area Px, the higher the environmental humidity, the greater the moisture content of the paper P, and the more easily the front end of the paper P curls. Therefore, the numerical value of the set value is large. As the water content of the paper P increases, the paper P expands as the paper P absorbs water, and the paper P is more likely to curl. Regarding the size of the paper P, three types of letters (width 216 mm × length 279 mm), A4 (width 210 mm × length 297 mm), and legal (width 216 mm × length 356 mm) are determined, and the length in the longitudinal direction is determined. The longer the value, the larger the setting value. This is because when the stop process is performed in a state in which the rear end of the sheet P is arranged downstream of the opposing position in the transport direction in order to avoid the sheet P from contacting the ejection surface 1a during the stop process, It is presumed that the longer the length of the paper P, the longer the length of the region arranged downstream of the paper P pinching point P1 in the discharge direction X, and the more easily the leading edge of the paper P curls. It is to be done. As the length of the region disposed downstream of the paper P pinching point P1 in the discharge direction X is longer, the region of the paper P that comes into contact with the first arm 41 increases, so the leading end of the paper P is excessively curved. It becomes easy to be done.

  In FIG. 8B, the reference value is smaller as the condition that the leading end of the paper P is more likely to curl. Specifically, the thickness of the paper P is determined to be three types: thin, normal, and thickness, and it is presumed that the smaller the thickness, the more easily the leading edge of the paper P curls. Is getting smaller. Regarding the direction of the eyes of the paper P, it is assumed that the front end portion of the paper P is more likely to curl in the width direction than in the longitudinal direction, so the reference value is small. Specifically, when the direction of the eyes of the paper P is the longitudinal direction (that is, the direction parallel to the transport direction), the paper P is along the width direction of the paper P (that is, viewed from the longitudinal direction of the paper P). Easy to curl to be convex or concave. When the direction of the eyes of the paper P is the width direction (that is, the direction orthogonal to the transport direction), the paper P is convex or concave along the longitudinal direction of the paper P (that is, viewed from the width direction of the paper P). So easy to curl. When the leading direction of the paper P is pressed by the first arm 41 when the direction of the eyes of the paper P is the width direction, the paper P is excessively compared with the case where the direction of the eyes of the paper P is the longitudinal direction. Easy to bend. Therefore, the numerical value of the reference value is smaller when the direction of the eyes of the paper P is the width direction.

  When the evaluation value is less than the reference value (S8: YES), the main controller 150 selects the first stop process (S9), and when the evaluation value is not less than the reference value (that is, the evaluation value is greater than or equal to the reference value) ( S8: NO), the second stop process is selected (S10).

  For example, in double-sided recording, large-sized dots are ejected over the entire surface (setting value: 3 + 3), environmental humidity = 80% (setting value: 3), paper P size = A4 (setting value: 1), When the thickness is normal and the eye direction of the paper P is the longitudinal direction, the evaluation value is 10 (= 3 + 3 + 3 + 1) and the reference value is 9. In this case, since evaluation value> reference value (S8: NO), the main controller 150 selects the second stop process (S10).

  After selecting stop processing in S9 or S10 for all the sheets P based on the recording command, the main controller 150 ends the stop processing selection routine and returns to the main routine, and performs recording control for each sheet P (F4). ). Specifically, the main controller 150 controls the transport units 50 and 92 so as to transport the paper P along the corresponding path, and controls the head 1 so as to record an image on the paper P at the opposite position. To do.

  Note that the main controller 150 determines the amount of paper P supported by each tray 4, 94 based on a signal from the full load sensor 43S during the recording control (in this embodiment, the maximum amount of paper in each tray 4, 94). Whether or not P is supported). When the maximum amount of paper P is supported on both trays 4 and 94, the main controller 150 may notify the user via an output unit such as a speaker.

  The conveyance path of the paper P differs depending on whether single-sided recording or double-sided recording. In the case of single-sided recording, the main controller 150 controls the transport unit 50 so that the paper P is transported along the black arrows in FIG. 1 by the transport units 50a and 50b. In the case of duplex recording, the main controller 150 causes the roller pair 25 to move when the sheet P is nipped by the roller pair 25 after the sheet P is conveyed along the black arrows in FIG. By reversing the rotation direction, the paper P is fed into the re-conveying unit 50c. Then, the paper P is transported along the white arrow in FIG. 1 by the re-conveying unit 50c, and transported so that the paper P is transported along the black arrow in FIG. 1 again from the middle part of the guide 31c by the transport units 50a and 50b. The unit 50 is controlled.

  The transport path of the paper P differs depending on which of the trays 4 and 94 the paper P is discharged. The main controller 150 selects one of the trays 4 and 94 based on the information included in the recording command and whether or not the maximum amount of paper P is supported on each of the trays 4 and 94, and the paper P The transport units 50 and 92 are controlled so as to be discharged. For example, if the recording command includes information indicating in which of the trays 4 and 94 the paper P is to be discharged, the main controller 150 causes the transport unit to discharge the paper P to the designated tray. 50 and 92 are controlled. However, when the maximum amount of paper P is supported on the designated tray, the main controller 150 controls the transport units 50 and 92 so that the paper P is discharged to a tray other than the designated tray.

  For each sheet P, the main controller 150 completes the recording on the sheet P, and after the trailing end of the sheet P has passed the opposing position, the main controller 150 performs the stop process selected in the stop process selection routine. 92 is controlled (F5 to F11). The stop process is a process for temporarily stopping the transport operation by the transport units 50 and 92 before the paper P is discharged to the tray 4 or 94, and includes a first stop process and a second stop process.

  As shown in FIG. 10, the first stop process is a portion of the paper P that is downstream of the pinching point P1 in the discharge direction X with respect to the gap D between the pinch point P1 and the first arm 41 in the discharge direction X. This is a process of temporarily stopping the transport operation in the first state in which the length of is long. Specifically, the first stop process is a process for temporarily stopping the transport operation after the first time has elapsed after the paper sensor 80S detects the trailing edge of the paper P. In the first state, the length of the downstream portion of the paper P in the discharge direction X is longer than the distance D between the pinch point P1 and the first arm 41 with respect to the discharge direction X. It is set in advance at the time.

  As shown in FIGS. 11 and 12, the second stop process is a process for temporarily stopping the transport operation in the second state in which the length of the portion of the paper P is equal to or less than the interval D. While the second stop process is performed, the sheet P is held between the roller pair 26 or 96. In the second stop process, the length of the portion of the paper P is less than the interval D, and the first arm 41 does not contact the paper P. In the second stop process shown in FIG. 12, the above relationship is established for the roller pair 96 and the first arm 41 corresponding to the removable tray 94. That is, in the second stop process shown in FIG. 12, the pinching point P1 is a pinching point of the paper P by the roller pair 96, and the interval D is provided for the pinching point P1 in the discharge direction X and the detachable tray 94. This is the distance between the pressing portion 40 and the first arm 41.

  Specifically, in the second stop process, when the reversal process is performed before the process as shown in FIG. 11, the transport operation is temporarily performed after the rotation direction of the roller pair 25 is reversed for the second time. This is a process to stop. The second time is set in advance to a time when the length of the portion of the paper P conveyed by the reversing roller pair 25 is in the second state in which the length is equal to or less than the interval D. Further, in the second stop process, when the paper P is guided to the detachable tray 94 as shown in FIG. 12, the transport operation is performed after the third time elapses after the paper sensor 80S detects the rear end of the paper P. This is a process to stop. The third time is set in advance to a time when the roller pair 96 and the first arm 41 corresponding to the detachable tray 94 are in the second state in which the length of the portion of the paper P is not more than the interval D. Note that the third time is longer than the first time.

  In the process related to the stop process execution, the main controller 150 first determines whether or not the first stop process is selected in the stop process selection routine (F5). When the main controller 150 determines that the first stop process has been selected (F5: YES), the main controller 150 executes the first stop process shown in FIG. 10 (F6).

  When the main controller 150 determines that the first stop process is not selected (that is, the second stop process is selected) (F5: NO), the main controller 150 determines whether or not to discharge the paper P to the main body tray 4. (F7). When it is determined that the paper P is to be discharged to the main body tray 4 (F7: YES), the main controller 150 performs a reversal process (F8), and then performs a second stop process (F9) shown in FIG. The reversal process (F8) is a process performed by the main controller 150, and reverses the transport direction of the paper P transported by the transport units 50a and 50b by reversing the rotation direction of the roller pair 25, so that the paper This is a process of arranging at least a part of P on the transport path by the re-transport unit 50c. Specifically, the main controller 150 reverses the rotation direction of the roller pair 25 for the second time in a state where the rear end of the paper P is held between the roller pair 25. The state in which the rear end of the paper P is sandwiched between the roller pair 25 is after the fourth time has elapsed after the paper sensor 80S detects the rear end of the paper P. The fourth time is set in advance based on the value obtained by dividing the distance of the conveyance path between the sheet sensor 80S and the roller pair 25 by the conveyance speed.

  When it is determined that the paper P is not discharged into the main body tray 4 (F7: NO), the main controller 150 performs a guidance process (F10), and then performs a second stop process (F11) shown in FIG. The guidance process (F10) is a process performed by the main controller 150, and refers to a process of controlling the guide unit 20 and causing the guide unit 20 to guide the paper P along the route R2. Specifically, it refers to a process of moving the guide unit 20 to the second position.

  The main controller 150 executes the stop process at F6, F9, or F11 for each paper P, and then controls the transport units 50 and 92 so that the paper P is discharged to the tray 4 or 94 (F12).

  When the recording on all the sheets P based on the recording command is completed, the main controller 150 stands by until a new recording command is received. When the main controller 150 receives a new recording command, the main controller 150 repeatedly performs the above-described control.

  As described above, according to the present embodiment, the curl at the front end portion of the paper P can be effectively corrected by the first stop process (see FIG. 10). By the second stop process, bending of the paper P discharged to the tray 4 or 94 can be suppressed (see FIGS. 11 and 12). In this way, the main controller 150 can perform the first stop process and the second stop process instead of uniformly performing the first stop process, so that the tray 4 or 94 can be used using the first arm 41. The deterioration of the alignment of the paper P can be effectively suppressed. After the first stop process or the second stop process is performed, the transport operation by the transport units 50 and 92 is resumed. When the transport operation is resumed, the paper P is discharged to the tray 4 or 94 while pushing up the first arm 41 upward. At this time, the sheet P to be subjected to the first stop process has a leading end portion of the sheet P along the transport direction (that is, viewed from the width direction of the sheet P) as compared to the sheet P to be subjected to the second stop process. B) Difficult to bend so as to be convex or concave. In other words, the paper P to be subjected to the first stop process has a stronger resistance to the pressing force by the first arm 41 than the paper P to be subjected to the second stop process. The strength of the force resisting the pressing force by the first arm 41 can be paraphrased as, for example, the waist strength of the paper P. That is, the paper P to be subjected to the first stop process is stronger than the paper P to be subjected to the second stop process, and therefore has a strong force to push the first arm 41 upward. Therefore, in the first stop process, the sheet P is brazed in a state where the first arm 41 is pushed up slightly by the waist of the sheet P, that is, in a state where the leading end portion of the sheet P is not excessively curved. Therefore, even when the transport operation is resumed, it is possible to avoid a situation in which the leading end portion of the paper P collides with the tray 4 or 94 and bends. On the other hand, if the first stop process is performed on the paper P to be subjected to the second stop process, the first arm 41 curls the paper P in a state where the leading end portion of the paper P is excessively curved. It will be done. Therefore, when the transport operation is resumed, a situation in which the leading end portion of the paper P collides with the tray 4 or 94 and is easily bent. However, in the second stop process, since the pressing force by the first arm 41 is smaller than that in the first stop process, the leading end portion of the paper P is not excessively curved by the first arm 41. Therefore, it is possible to avoid a situation in which the paper P is bent even when the transport operation is resumed.

  In the second stop process, the length of the portion of the paper P that is downstream of the pinching point P1 in the discharge direction X is less than the interval D, and the first arm 41 does not contact the paper P (FIGS. 11 and 12). reference). Thereby, the bending of the paper P discharged to the tray 4 or 94 can be more reliably suppressed.

  As shown in FIGS. 8A, 8B, and 9, the main controller 150 determines the basis weight of the paper P, the direction of the eyes of the paper P, the size of the paper P, the number of dots in the evaluation area Px of the paper P, A first determination process (a stop process selection routine shown in FIG. 6) is performed to determine which of the first stop process and the second stop process is executed based on the liquid amount and the environmental humidity. Thereby, the deterioration of the alignment of the paper P in the tray 4 or 94 can be suppressed more effectively.

  Further, the main controller 150 determines that the basis weight of the paper P is a predetermined basis weight as shown in FIGS. 8A, 8B, and 9 in the first determination process (the stop process selection routine shown in FIG. 6). Is smaller than the predetermined direction, the direction of the eyes of the paper P is different from the predetermined direction, the size of the paper P is larger than the predetermined size, the number of dots in the evaluation area Px is larger than the predetermined number, the evaluation area Px It is determined that the second stop process is to be executed in at least one of the case where the amount of liquid is greater than the predetermined amount and the environmental humidity is higher than the predetermined humidity.

  Further, the main controller 150 determines whether the basis weight of the paper P is smaller than a predetermined basis weight, whether the direction of the eyes of the paper P is different from the predetermined direction, and the size of the paper P is smaller than the predetermined size. Whether the number of dots in the evaluation region Px is greater than a predetermined number, whether the amount of liquid in the evaluation region Px is greater than a predetermined amount, and the environmental humidity is higher than the predetermined humidity A derivation process (S7) for deriving an evaluation value according to at least one of the above is performed. When the evaluation value is less than the reference value (S8: YES) in the first determination process (stop process selection routine shown in FIG. 6), the main controller 150 determines that the first stop process is to be executed (S9). If the value is greater than or equal to the reference value (S8: NO), it is determined to execute the second stop process (S10).

  When the main controller 150 determines that double-sided recording is performed in the second determination process, the main controller 150 determines the number of dots and the amount of liquid in the evaluation area Px for both the front surface Pa and the back surface Pb shown in FIG. First determination processing (stop processing selection routine shown in FIG. 6) is performed. Thereby, it is possible to appropriately cope with double-sided recording.

  The main controller 150 performs a reversal process (see FIG. 11) before performing the second stop process. Thereby, it is possible to avoid the sheet P from coming into contact with the head 1 during the second stop process. Further, the printer 100 can be reduced in size as compared with the case where the arrangement area of the paper P is separately provided in the second stop process. That is, according to the above configuration, it is possible to prevent the paper P from contacting the head 1 while suppressing an increase in the size of the printer 100.

  The main controller 150 performs a guidance process (see FIG. 12) before performing the second stop process. Thereby, it is possible to avoid the sheet P from coming into contact with the head 1 during the second stop process.

  While the second stop process is being performed, the paper P is held between the roller pair 26 or 96 (see FIGS. 11 and 12). Thereby, the curl suppression effect of the front-end | tip part of the paper P and the jam suppression effect can be acquired reliably.

  The length of the path R1 is shorter than the length of the paper P with respect to the transport direction. Thereby, miniaturization of the printer 100 is realized. Further, when the path R1 is relatively short as described above, when the paper P is discharged to the main body tray 4, the trailing edge of the paper P is prevented from coming into contact with the head 1 during the stop process. When the stop process is performed in a state where the sheet P is disposed downstream of the opposing position in the transport direction, the leading end portion of the sheet P naturally protrudes downstream of the roller pair 26 in the discharge direction, and the sheet is pressed by the pressing force of the first arm 41. There may be a problem that the tip portion of P is excessively curved. However, according to this embodiment, the problem can be reduced.

  The main controller 150 executes either the first stop process or the second stop process after the trailing edge of the paper P has passed the facing position. Thereby, it is possible to avoid the sheet P from coming into contact with the head 1 during each stop process.

  When recording is performed using a liquid as in the present embodiment, the moisture content of the paper P increases and the paper P is likely to curl. However, according to the present embodiment, curling can be effectively corrected.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims.

About the recording device:
In the recording apparatus, the detachable tray may not be detachable.
The recording apparatus according to the present invention is not limited to a printer, and may be a facsimile, a copier, or the like.

About recording media:
The recording medium is not limited to the paper P, and may be any recordable medium.

About the recording section:
The number of recording units included in the recording apparatus may be an arbitrary number of 1 or more.
The recording unit may eject any liquid other than black ink (for example, ink other than black, pretreatment liquid, etc.).
The recording unit is not limited to one that ejects liquid (inkjet system as in the above-described embodiment). For example, the recording unit is electrically latent on the photosensitive member by irradiating a charged photosensitive member with laser light or the like. It may be one that forms an image and transfers the latent image to a recording medium (laser method), one that transfers ink applied to a tape to a recording medium by heat (thermal transfer method), or the like. In the case of a laser system, toner corresponds to a recording agent.

About the tray:
The tray is not limited to being provided on the top plate of the casing of the recording apparatus, and may be provided on the side of the casing, for example. The same applies to the detachable tray, and the detachable tray is not limited to being provided at the top of the recording apparatus main body, and may be provided at the side of the recording apparatus main body, for example.
The support surface of the recording medium in the tray may extend in any direction, for example, in the horizontal direction.

About the transport section:
-With respect to the transport direction, the length of the transport path extending from the facing position to the clamping member may be longer than the length of the recording medium.
-A conveyance part is not limited to the roller conveyance system like the above-mentioned embodiment, For example, a belt conveyance system may be sufficient.
The clamping member is not limited to the roller pair, and may be a pair of plates for guiding the recording medium along the conveyance path, for example.
-There may be a gap between the clamping member and the recording medium.
When the clamping member is a plate pair, the portion between the plate pair corresponds to the clamping point, and the starting point of the interval between the clamping point and the pressing member is the portion near the discharge port in the plate pair.

About pressing member:
The pressing member does not move according to the amount of the recording medium supported by the tray, and may not be used for determining the amount of the recording medium supported by the tray.
In the above-described embodiment, the pressing member is configured by the three arms 41a and 41b, but may be configured by an arbitrary number (for example, one) of parts.
The first arm is not limited to be disposed at a position that contacts one end and the other end in the width direction of the recording medium, and may be disposed at a position that contacts only the center in the width direction of the recording medium.

About control contents by the control unit:
The control unit may be able to execute a stop process other than the first stop process and the second stop process. Further, the control unit may be capable of executing a discharge process for discharging the recording medium without executing the stop process, that is, without temporarily stopping the transport operation.
In the above-described embodiment, the control unit may perform the second stop process without performing F7, F8, or F10. In this case, the second stop process may be a process of temporarily stopping the transport operation after the fifth time has elapsed after the paper sensor 80S detects the trailing edge of the paper P. In the fifth time, in the second state, the length of the portion of the paper P that is downstream of the pinching point P1 in the discharge direction X is equal to or less than the interval D between the pinching point P1 and the first arm 41 in the discharge direction X. May be set in advance at the time. Note that the fifth time may be set to be shorter than the first time. Further, in the second stop process, when the paper P is discharged to the detachable tray 94, the nipping point P1 of the paper P for the roller pair 96 and the first arm 41 corresponding to the detachable tray 94 for the fifth time. Alternatively, the length of the portion on the downstream side in the discharge direction X may be set to a time when the second state is set to be equal to or less than the distance D between the clamping point P1 and the first arm 41 in the discharge direction X.
The control unit may determine not only whether or not the amount of the recording medium supported on the tray is the maximum amount but also the amount of the recording medium supported on the tray based on the signal from the sensor. Further, the control unit does not have to determine the amount of the recording medium supported by the tray.
The control unit executes either the first stop process or the second stop process with at least a part of the recording medium facing the recording unit before the rear end of the recording medium passes the facing position. Also good.
-A control part does not need to perform an inversion process, before performing a 2nd stop process.
-While the 2nd stop processing is performed, the recording medium does not need to be clamped by the clamping member.
In the second stop process, the length of the portion of the recording medium on the downstream side in the ejection direction from the clamping point is equal to the interval between the clamping point of the recording medium by the clamping member in the ejection direction and the pressing member, and the pressing member May contact the recording medium. Even in this case, when the second stop process is performed, the contact area of the recording medium with the pressing member is smaller than when the first stopping process is performed, and the load applied to the recording medium by the pressing member is reduced. Accordingly, it is possible to reduce the problem that the leading end portion of the recording medium is excessively curved by the pressing force of the pressing member.
In the second stop process, the length of the portion of the recording medium on the downstream side in the ejection direction from the clamping point may be 0 or less (minus) (in the case of minus, the recording medium becomes the ejection clamping member) Not pinched).
In the above-described embodiment, the control unit may perform a guidance process instead of the inversion process. That is, the control unit determines that the second stop process is selected (F5: NO), and determines that the sheet P is discharged to the main body tray 4 (F7: YES), the second heading toward the detachable tray 94 is performed. The second stop process may be performed after the paper P is arranged in the transport path.
Each stop process is not limited to a configuration in which the conveyance operation is temporarily stopped after a predetermined time has elapsed since the sensor that detects the recording medium detects the trailing edge of the recording medium. For example, each stop process may be configured to temporarily stop the transport operation after a predetermined time has elapsed since the sensor that detects the recording medium detects the leading edge of the recording medium. Further, the sensor for detecting the recording medium may be disposed at an arbitrary position on the recording medium conveyance path.
-About the judgment method of the first judgment process:
The parameters and numerical values shown in the tables of FIGS. 8A and 8B and the graph of FIG. 9 are examples.
As parameters, the basis weight of the recording medium, the direction of the eyes of the recording medium, the size of the recording medium, the number of dots in the end area of the recording medium, the amount of the recording agent in the end area of the recording medium, and the environmental humidity are all no, not good using at least one of these elements. For example, in the above-described embodiment, the size of the paper P may be omitted as a parameter.
The set value may be set more finely, such as 0-10, or may be set in two stages, 0, 1. The set value may be weighted.
In the above-described embodiment, the set values of all the parameters shown in the table of FIG. 8A are summed up to derive the evaluation value, and the evaluation value is compared with the reference value, and the first stop process and the second stop are performed. Although it is determined which of the processing is executed, the present invention is not limited to this. For example, an evaluation value is derived based on some parameters, and if the evaluation value is less than the reference value, it is determined that the first stop process is to be executed. Then, a new evaluation value may be derived, and the evaluation value and the reference value may be compared to determine which of the first stop process and the second stop process is to be executed. For example, in the above-described embodiment, when the set value for the number of dots and the liquid amount in the evaluation region Px is less than 3, it is determined that the first stop process is executed. When the set value is 3, the environmental humidity is 50%. It may be determined that the first stop process is executed if the ratio is less than 50% and the second stop process is executed if the environmental humidity is 50% or more.
The reference value may be determined by an arbitrary method. In the above-described embodiment, the reference value is determined based on the thickness of the paper P and the direction of the eyes of the paper P, but is not limited to this. For example, the reference value may be determined based on parameters other than the thickness of the paper P and the direction of the eyes of the paper P, or the reference value may be determined for each parameter that is the basis of the evaluation value.
From the viewpoint of correcting curling of one end and the other end in a direction orthogonal to the recording medium discharge direction, the one end and the other end may be used as an end region.
Further, the evaluation area Px is not limited to the end area of the recording medium, and may be the entire surface of the recording medium or an arbitrary part.
Information used for the first determination process (information about parameters) is not limited to being included in the recording command. For example, the user may specify the information via an input unit (touch panel or the like) of the recording apparatus separately from the recording command, and the control unit may acquire the information. Further, the control unit may acquire information (such as information on the basis weight and size of the recording medium) based on a detection signal from a sensor provided in the recording apparatus.
The control unit may not execute either the first stop process or the second stop process. For example, the control unit determines whether or not to perform stop processing for each recording on one recording medium, and performs the first stop processing or the second stop processing when determining that the stop processing is to be performed. It's okay.

1 Inkjet head (recording part)
1a Discharge surface 4 Body tray (tray)
20 Guide part 25 Roller pair (reversing part)
26 Roller pair (clamping member)
41 First arm (pressing member)
50 transport unit 50a upstream transport unit (first transport unit)
50c Re-conveying part (second conveying part)
94 Detachable tray 150 Main controller (control unit)
100 Inkjet printer (recording device)
D Interval P Paper (Recording medium)
P1 clamping point Pa surface (first surface)
Pb Back side (2nd side)
Px evaluation area (edge area)
R1 route (first transport route)
R2 route (second transport route)
X discharge direction

Claims (11)

A recording unit for recording an image on a recording medium;
A tray on which a recording medium on which an image is recorded by the recording unit is discharged;
A transport unit for transporting a recording medium on which an image is recorded by the recording unit toward the tray, including a sandwiching member that sandwiches the recording medium discharged to the tray;
Press for extending the recording medium sandwiched by the sandwiching member in a direction intersecting a discharge direction in which the recording medium is ejected toward the tray and pressing the recording medium sandwiched by the sandwiching member toward the tray A member,
A control unit for controlling the transport unit,
The controller is
In the first state, the length of the portion of the recording medium on the downstream side in the ejection direction is longer than the interval between the clamping point of the recording medium by the clamping member in the ejection direction and the pressing member. a first stop processing temporarily stopping the transport operation by the transport unit, Ri executable der and a second stop process temporarily stops the transport operation the length in the second state is less than the distance of the recording medium ,
Performing a first determination process for determining which of the first stop process and the second stop process is to be executed;
In the first determination process, when the basis weight of the recording medium is smaller than the predetermined basis weight, when the direction of the eyes of the recording medium is different from the predetermined direction, when the size of the recording medium is larger than the predetermined size, recording is performed. When the number of dots in the end region disposed downstream of the nipping point in the discharge direction when the first stop process of the medium is larger than a predetermined number, the recording material in the end region The recording apparatus according to claim 1, wherein the second stop process is determined to be executed in at least one of a case where the amount is greater than a predetermined amount and a case where the environmental humidity is higher than the predetermined humidity .   The recording apparatus according to claim 1, wherein, in the second stop process, the length of the recording medium is less than the interval, and the pressing member does not contact the recording medium. The controller is
Whether the basis weight of the recording medium is smaller than the predetermined basis weight, whether the direction of the eyes of the recording medium is different from the predetermined direction, and whether the size of the recording medium is larger than the predetermined size , Whether the number of dots in the end region is greater than the predetermined number, whether the amount of recording agent in the end region is greater than the predetermined amount, and the environmental humidity is the predetermined amount Perform a derivation process to derive an evaluation value according to whether or not it is higher than humidity,
In the first determination process, when the evaluation value is less than a reference value, it is determined to execute the first stop process, and when the evaluation value is greater than or equal to the reference value, it is determined to execute the second stop process. The recording apparatus according to claim 1, wherein: The controller is
Performing a second determination process for determining whether an image is recorded on both the first surface of the recording medium and the second surface opposite to the first surface;
If it is determined in the second determination process that images are recorded on both surfaces, at least one of the number of dots in the edge region and the amount of recording agent in the edge region for both surfaces The recording apparatus according to any one of claims 1 to 3 , wherein the first determination process is performed based on the determination. The transport unit includes a first transport unit for transporting a recording medium toward an opposing position facing the recording unit, a reversing unit for reversing the transport direction of the recording medium transported by the first transport unit, And a second transport unit for transporting the recording medium whose transport direction is reversed by the reversing unit toward the facing position,
The control unit reverses the conveyance direction of the recording medium conveyed by the first conveyance unit by the reversing unit before performing the second stop process, so that at least a part of the recording medium is transferred to the second conveyance unit. and performing an inversion process to place the transport path of recording apparatus according to any one of claims 1-4. The recording medium on which the image is recorded by the recording unit is discharged, and a detachable tray different from the tray is detachable,
The transport unit includes a third transport unit that transports a recording medium along a first transport path that extends from a facing position facing the recording unit to the holding member, and the first transport path from the facing position toward the detachable tray. A fourth transport unit that transports the recording medium along a second transport path that is longer than the one transport path;
A guide unit for guiding the recording medium on which the image is recorded by the recording unit to either the first transport path or the second transport path;
The control unit controls the guide unit before performing the second stop process, and performs a guide process for guiding the recording medium to the second transport path by the guide unit. recording apparatus according to any one of 1-4. While the second stop processing is performed, wherein the recording medium is held on the clamping member, the recording apparatus according to any one of claims 1-6. The transport unit transports a recording medium along a first transport path extending from an opposing position facing the recording unit to the clamping member;
Wherein in the conveyance direction by the transport unit, the length of the first transport path to being shorter than the length of the recording medium, a recording apparatus according to any one of claims 1-7. The control unit executes either the first stop process or the second stop process after an end on the upstream side in the transport direction of the recording medium by the transport unit passes through a facing position facing the recording unit. characterized by, recording apparatus according to any one of claims 1-8. The recording unit is characterized by having a discharge surface on which a plurality of discharge ports for discharging the liquid are formed, the recording apparatus according to any one of claims 1-9. A recording section for recording an image on a recording medium; a tray on which a recording medium on which an image is recorded by the recording section is ejected; and a clamping member that sandwiches the recording medium ejected on the tray. And a conveyance unit for conveying the recording medium on which the image is recorded toward the tray, and a direction intersecting a discharge direction in which the recording medium held by the holding member is discharged toward the tray. A recording apparatus comprising: a pressing member for pressing the recording medium held by the holding member toward the tray; and a control unit for controlling the conveying unit.
In the first state, the length of the portion of the recording medium on the downstream side in the ejection direction is longer than the interval between the clamping point of the recording medium by the clamping member in the ejection direction and the pressing member. The first stop process for temporarily stopping the transport operation by the transport unit, and the second stop process for temporarily stopping the transport operation in a second state in which the length of the recording medium is equal to or less than the interval, Make the control function ,
Further, when a first determination process is performed to determine which of the first stop process and the second stop process is executed, and the basis weight of the recording medium is smaller than a predetermined basis weight in the first determination process When the direction of the eyes of the recording medium is different from the predetermined direction, when the size of the recording medium is larger than the predetermined size, when the first stop process of the recording medium is performed, When the number of dots in the end region arranged on the downstream side is larger than a predetermined number, when the amount of the recording agent in the end region is larger than the predetermined amount, and the environmental humidity is higher than the predetermined humidity If, in such judges to execute the second stopping process when at least one, and wherein the Rukoto to function the control unit, a program.