JP2019104189A - Liquid discharge device - Google Patents

Abstract

To correctly detect that, a nozzle face contacts a discharge object medium.SOLUTION: In a discharge operation for moving a carriage at target speed Va, and discharging an ink from a nozzle, if a reduction amount of the movement speed Vc of the carriage from the target speed Va exceeds a threshold Vn, it is determined that the nozzle face contacts a recording sheet, and movement of the carriage is stopped. In normal operations, the threshold Vn is set to a first value V1 (S201). In a period since a time Ta passed (S205:YES) after a cover is closed (S204:YES) since a time point when a cover of a reading table is opened (S202:YES), and a period since a time Tb passed (S209:YES) after a sheet cassette is attached to a cassette attachment part (S208:YES) since a time point when the sheet cassette is detached from the cassette attachment part (S206:YES), a threshold Vn is set to a second value V2(>V1) (S203, S207).SELECTED DRAWING: Figure 7

Description

  The present invention relates to a liquid ejection apparatus that ejects liquid from a nozzle.

  As an example of a liquid ejection apparatus that ejects liquid from the nozzles, Patent Document 1 describes a printing apparatus that ejects ink from the nozzles to perform printing. In the printing apparatus of Patent Document 1, printing is performed on a sheet by moving the carriage in the scanning direction and performing a printing operation of discharging ink from the print head mounted on the carriage toward the sheet. Further, in the printing apparatus of Patent Document 1, when the moving speed of the carriage decreases during the printing operation, it is determined that a paper jam has occurred, and the printing operation is stopped.

Japanese Patent Application Laid-Open No. 11-208051

  Here, in Patent Document 1, even if the print head is in contact with the sheet, if the decrease in the carriage speed is small, the print operation may be continued while the print head rubs against the sheet, and the nozzle may be damaged. Therefore, from the viewpoint of reliably preventing the print head from rubbing against the sheet due to movement of the carriage while the print head is in contact with the sheet, a paper jam occurs at a stage where the speed of the carriage is small. It is preferable to judge. However, when it is determined that a paper jam has occurred at a stage where the speed decrease of the carriage is small, for example, during printing, the housing of the printing apparatus vibrates due to external force by opening and closing the cover and attaching and detaching the sheet cassette, Even when the moving speed of the carriage slightly decreases due to the vibration of the housing, it is determined that a paper jam has occurred by mistake, and the printing operation is stopped.

  An object of the present invention is to provide a liquid discharge apparatus capable of accurately detecting contact between a liquid discharge head and a medium to be discharged.

  The liquid discharge apparatus according to the present invention includes a case, a cover attached to the case, a carriage housed in the case and moving in a scanning direction, mounted on the carriage, and forming a nozzle and the nozzle. A liquid discharge head having a fixed nozzle surface, a speed detection unit for detecting the movement speed of the carriage, a cover sensor for detecting that the cover has moved relative to the housing, and a control device And the control device causes the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzle toward the medium to be discharged while moving the carriage at a target speed, and during the discharge operation, The carriage is stopped when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit exceeds a threshold, The control device further sets the threshold value to a first value when movement of the cover is not detected based on a signal from the cover sensor while moving the carriage for the discharge operation. When movement of the cover is detected based on a signal from the cover sensor while moving the carriage for operation, the threshold is set to a second value larger than the first value for a predetermined setting period. Set

  Further, the liquid discharge apparatus of the present invention includes a case, a cassette for containing a medium to be discharged, a cassette mounting portion provided on the case, the cassette being detachably mounted, and the case being housed in the case A carriage that moves in a scanning direction, a liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed, a speed detection unit for detecting a moving speed of the carriage, And a controller configured to detect that the cassette has been attached to and detached from the cassette mounting unit, and the controller controls the liquid discharge head to move the carriage at a target speed. The discharge operation is performed to discharge the liquid from the nozzle toward the discharge medium, and the carrier is detected based on the signal from the speed detection unit during the discharge operation. The carriage is stopped when the amount of decrease of the movement speed from the target speed exceeds a threshold, and the control device further causes the detachment sensor to move the carriage for the discharge operation. When the detachment of the cassette is not detected based on the signal from the cassette, the threshold is set to the first value, and the cassette is moved based on the signal from the detachment sensor while moving the carriage for the ejection operation. When the attachment / detachment of is detected, the threshold is set to a second value larger than the first value for a predetermined setting period.

  A liquid having a housing, a cover attached to the housing, a carriage housed in the housing and moving in the scanning direction, a nozzle mounted on the carriage, and a nozzle surface on which the nozzles are formed The control device includes: a discharge head; a speed detection unit for detecting a moving speed of the carriage; a cover sensor for detecting that the cover has moved relative to the housing; And causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzle toward the discharge medium while moving the carriage at a target speed, and during the discharge operation, the signal from the speed detection unit is used. The carriage is stopped when the amount of decrease of the movement speed of the carriage detected based on the target speed exceeds a threshold, and the control device further When the movement of the cover is detected based on the signal from the cover sensor while moving the carriage for the ejection operation, the signal from the speed detection unit during the ejection operation for a predetermined setting period Even if the amount of decrease of the moving speed of the carriage detected based on the target speed from the target speed exceeds a threshold, the carriage is kept moving without being stopped.

  Further, the liquid discharge apparatus of the present invention includes a housing, a cassette for containing a medium to be discharged, a cassette mounting portion provided on the housing and to which the cassette is detachably mounted, and the housing is housed in the housing A carriage that moves in a scanning direction, a liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed, a speed detection unit for detecting a moving speed of the carriage, And a controller configured to detect that the cassette has been attached to and detached from the cassette mounting unit, and the controller controls the liquid discharge head to move the carriage at a target speed. The discharge operation is performed to discharge the liquid from the nozzle toward the discharge medium, and during the discharge operation, the carriage is detected based on a signal from the speed detection unit. The carriage is stopped when the amount of decrease in the movement velocity from the target velocity exceeds a threshold, and the control device further causes the detachment sensor to move the carriage for the ejection operation. When the attachment and detachment of the cassette is detected based on the signal, the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit during the discharge operation for a predetermined setting period. Even if the amount of drop from the threshold exceeds the threshold, the carriage continues to move without stopping.

  A liquid discharge apparatus according to the present invention is a liquid having a housing, a carriage housed in the housing and moving in the scanning direction, a nozzle mounted on the carriage, and a nozzle surface on which the nozzles are formed. The control device includes: a discharge head; a speed detection unit for detecting a moving speed of the carriage; a human sensor provided in the casing for detecting an approach of a person; And causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzle toward the discharge medium while moving the carriage at a target speed, and during the discharge operation, the signal from the speed detection unit is used. The carriage is stopped when the amount of decrease of the movement speed of the carriage detected based on the target speed exceeds a threshold, and the control device further performs the discharge operation. While moving the carriage, based on the signal from the human sensor, when the approach of a person is not detected, the threshold is set to a first value, and the carriage is moved for the ejection operation. When the attachment or detachment of the cassette is detected based on a signal from the human sensor, the threshold is set to a second value larger than the first value for a predetermined setting period.

  A liquid discharge apparatus according to the present invention is a liquid having a housing, a carriage housed in the housing and moving in the scanning direction, a nozzle mounted on the carriage, and a nozzle surface on which the nozzles are formed. The control device includes: a discharge head; a speed detection unit for detecting a moving speed of the carriage; a human sensor provided in the casing for detecting an approach of a person; And causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzle toward the discharge medium while moving the carriage at a target speed, and during the discharge operation, the signal from the speed detection unit is used. The carriage is stopped when the amount of decrease of the movement speed of the carriage detected based on the target speed exceeds a threshold, and the control device further performs the discharge operation. When the approach of a person is detected based on the signal from the human sensor while moving the carriage, detection is performed based on the signal from the speed detection unit during the discharge operation for a predetermined setting period. Even if the amount of decrease of the moving speed of the carriage from the target speed exceeds a threshold, the carriage is kept moving without stopping.

  A liquid discharge apparatus according to the present invention is a liquid having a housing, a carriage housed in the housing and moving in the scanning direction, a nozzle mounted on the carriage, and a nozzle surface on which the nozzles are formed. The apparatus includes: a discharge head, a speed detection unit for detecting the moving speed of the carriage, a signal generation unit generating a signal related to the vibration of the housing due to an external force, and a control device. A discharge operation is performed to cause the liquid discharge head to discharge the liquid toward the discharge medium from the nozzle while moving the carriage at a target speed, and during the discharge operation, based on a signal from the speed detection unit The carriage is stopped when the amount of decrease of the movement speed of the carriage to be detected with respect to the target speed exceeds a threshold, and the control device further determines the signal. It is determined whether or not a predetermined condition is satisfied, and when the predetermined condition is not satisfied, the threshold is set to a first value, and when the predetermined condition is satisfied, the threshold is a second value larger than the first value Set to

  A liquid discharge apparatus according to the present invention is a liquid having a housing, a carriage housed in the housing and moving in the scanning direction, a nozzle mounted on the carriage, and a nozzle surface on which the nozzles are formed. The apparatus includes: a discharge head, a speed detection unit for detecting the moving speed of the carriage, a signal generation unit generating a signal related to the vibration of the housing due to an external force, and a control device. A discharge operation is performed to cause the liquid discharge head to discharge the liquid toward the discharge medium from the nozzle while moving the carriage at a target speed, and during the discharge operation, based on a signal from the speed detection unit The carriage is stopped when the amount of decrease of the movement speed of the carriage detected with respect to the target speed exceeds a threshold, and the control device further determines the signal. It is determined whether or not a predetermined condition is satisfied, and when the predetermined condition is satisfied, the movement speed of the carriage detected based on the signal from the speed detection unit during the ejection operation from the target speed Even if the amount of decrease exceeds a threshold, the carriage continues to move without stopping.

  In the present invention, when the liquid ejection apparatus is not vibrated by an external force, the carriage is stopped at a stage where the degree of reduction of the movement speed of the carriage is small, and the nozzle surface is rubbed and scratched with the discharge receiving medium. Can be prevented. On the other hand, when the movement speed of the carriage is reduced due to the vibration due to the external force while the liquid discharge device is vibrated by the external force, the movement speed of the carriage is reduced due to the contact between the nozzle surface and the discharge receiving medium. It is possible to prevent the carriage from being unnecessarily stopped by making an erroneous judgment.

FIG. 1 is a schematic configuration diagram of a printer according to an embodiment of the present invention. It is a top view of the printing part of FIG. (A) is a figure showing composition of an encoder belt and an encoder sensor seen from the lower stream side of a conveyance direction, and (b) is a figure showing composition of an encoder belt and an encoder sensor seen from the left of a scanning direction. It is the IV-IV sectional view taken on the line of FIG. FIG. 2 is a block diagram showing an electrical configuration of a printer. It is a flowchart which shows the flow of control at the time of printing. It is a flowchart which shows the flow of the process for setting a threshold value. It is a flowchart which shows the flow of the process for setting a threshold value in modification 1. FIG. (A) is a flowchart which shows the flow of the process for producing | generating the signal in copy in modification 2, (b) is a flowchart which shows the flow of the processing for setting the threshold value in modification 2. FIG. FIG. 13 is a block diagram showing an electrical configuration of a printer of a third modification. FIG. 18 is a flowchart showing a flow of processing for setting a threshold in Modification 3. FIG. FIG. 18 is a flowchart showing a flow of processing for setting a vibration flag in Modification 4; FIG. FIG. 16 is a flowchart showing a flow of processing at the time of printing in a modification 4; FIG. 15 is a flowchart showing a flow of processing for determining the number K of discharge processing in a fifth modification.

  Hereinafter, preferred embodiments of the present invention will be described.

<General configuration of printer>
The printer 1 (the “liquid discharge device” of the present invention) according to the present embodiment is a so-called multifunction machine capable of reading an original, facsimile communication, and the like in addition to printing on the recording paper P. As shown in FIG. 1, the printer 1 includes a rectangular parallelepiped housing 2, a printing unit 3, two cassette mounting units 4, a paper discharge tray 5, and a scanner 6.

<Printing unit>
As shown in FIGS. 1 and 2, the printing unit 3 includes a carriage 11, an inkjet head 12 (“liquid discharge head” according to the present invention), a platen 13, transport rollers 14 and 15, and a linear encoder 16 (speed according to the present invention). Detection unit "), media sensor 17 (" distance sensor "of the present invention), and the like. In FIG. 1, the linear encoder 16, guide rails 21 and 22 described later, support members 23 and 24 and the like are not shown.

  The carriage 11 is disposed in the housing 2. The carriage 11 is supported by two guide rails 21 and 22 extending in the scanning direction in the housing 2 and is movable in the scanning direction along the guide rails 21 and 22. The guide rails 21 and 22 are supported by the support members 23 and 24 by fixing both ends in the scanning direction (portions separated from each other in the scan direction) to the upper ends of the pair of support members 23 and 24. . Lower end portions of the support members 23 and 24 are fixed to the housing 2.

  The carriage 11 is connected to a carriage motor 106 (see FIG. 5) via a belt or the like (not shown). When the carriage motor 106 is driven, the carriage 11 moves in the scanning direction along the guide rails 21 and 22. In the following description, the right and left sides of FIG. 2 will be defined as the right and left sides in the scanning direction, respectively.

  The inkjet head 12 is mounted on the carriage 11. The lower surface of the inkjet head 12 is a nozzle surface 12 a on which a plurality of nozzles 10 are formed. The plurality of nozzles 10 are arranged in the transport direction orthogonal to the scanning direction to form a nozzle row 9, and four nozzle rows 9 are arranged in the scanning direction on the nozzle surface 12 a. From the plurality of nozzles 10, black, yellow, cyan, and magenta inks are ejected in order from the one forming the nozzle row 9 on the right side in the scanning direction.

  The platen 13 is disposed below the ink jet head 12 and faces the nozzle surface 12 a. Further, the platen 13 extends over the entire length of the recording sheet P in the scanning direction, and supports the recording sheet P from below.

  The conveyance rollers 14 and 15 are rollers extending in the scanning direction, and are disposed upstream and downstream of the carriage 11 in the conveyance direction, respectively. The conveyance rollers 14 and 15 are connected to the conveyance motor 107 (see FIG. 5) via a gear or the like (not shown). When the conveyance motor 107 is driven, the conveyance rollers 14 and 15 rotate to convey the recording sheet P in the conveyance direction.

<Linear encoder>
As shown in FIG. 2 and FIGS. 3A and 3B, the linear encoder 16 has an encoder sensor 31 and an encoder scale 32. The encoder sensor 31 is mounted on a portion of the carriage 11 that vertically overlaps with the guide rail 21. The encoder sensor 31 has a light emitting element 33 and a light receiving element 34 disposed opposite to each other in the transport direction, and emits light from the light emitting element 33 toward the light receiving element 34.

  The encoder scale 32 is a thin plate-like member elongated in the scanning direction, which is formed of a film, a thin metal plate or the like. The encoder scale 32 is formed with a plurality of slits 35 ("detected portions" in the present invention) arranged at equal intervals in the scanning direction. The encoder scale 32 is disposed on the guide rail 21. In addition, the encoder scale 32 is sandwiched between the light emitting element 33 and the light receiving element 34 in the transport direction. Further, both end portions of the encoder scale 32 in the scanning direction are fixed to fixing portions 21 a provided on the guide rails 21.

  Then, in the linear encoder 16, when the carriage 11 moves in the scanning direction, the light emitted from the light emitting element 33 passes through the slit 35 formed in the encoder scale 32, and the light receiving element 34 receives the light. The light emitted from the light emitting element 33 is blocked by the portion of the encoder scale 32 where the slit 35 is not formed, and the light receiving element 34 switches between receiving no light. Thus, the position and moving speed of the carriage 11 in the scanning direction can be detected in accordance with the number of times the light receiving element 34 receives light (the number of slits 35 passed).

<Media sensor>
As shown in FIGS. 1 and 2, the media sensor 17 is mounted on the carriage 11 and faces a portion of the platen 13 located upstream of the portion in the transport direction with respect to the portion facing the nozzle surface 12 a. The media sensor 17 has a light emitting element 36 and a light receiving element 37, and emits light from the light emitting element 36 toward the platen 13 or the recording paper P on the platen 13. Here, the upper surface of the platen 13 is black. In the media sensor 17, when the recording paper P is not disposed on the platen 13, the light emitted from the light emitting element 36 is hardly reflected by the platen 13 and is not received by the light receiving element 37. On the other hand, in a state where the recording sheet P is disposed on the platen 13, the light emitted from the light emitting element 36 is reflected by the recording sheet P and received by the light receiving element 37. Thus, the presence or absence of the recording sheet P can be detected depending on whether the light is received by the light receiving element 37 of the media sensor 17 or not. Further, in a state where the recording sheet P is disposed on the platen 13, the light received by the light receiving element 37 is smaller as the distance between the media sensor 17 and the recording sheet P (the distance between the nozzle surface 12 a and the recording sheet P) is smaller. The light intensity of the Thereby, based on the light quantity of the light received by the light receiving element 37 of the media sensor 17, distance information on the distance between the nozzle surface 12a and the recording paper P can be detected.

<Cassette mounting unit>
The two cassette mounting units 4 are provided in a portion located below the printing unit 3 of the housing 2 and are aligned in the vertical direction. A sheet cassette 40 is removably attached to each cassette attachment unit 4. More specifically, the sheet cassette 40 is mounted to the cassette mounting portion 4 of the sheet cassette 40 by being inserted into the cassette mounting portion 4 from the downstream side in the transport direction. Further, the sheet cassette 40 can be removed from the cassette mounting portion 4 by pulling out the sheet cassette 40 mounted in the cassette mounting portion 4 to the downstream side in the transport direction.

  The sheet cassette 40 has a sheet storage portion 40a whose upper surface is open. A plurality of recording sheets P are stored in the sheet storage portion 40 a in a state of being stacked in the vertical direction. Each cassette mounting unit 4 also includes a pickup roller 43. The pickup roller 43 is connected to the sheet feeding motor 108 (see FIG. 5) through a gear or the like (not shown). When the sheet feeding motor 108 is driven, the pickup roller 43 is rotated, and one recording sheet P located at the top among the plurality of recording sheets P stored in the sheet storage unit 40 a is indicated by an arrow A in FIG. As shown, it is supplied to the transport roller 14 from the upstream side in the transport direction.

  Further, each cassette mounting unit 4 includes a cassette sensor 44 (an example of the “attachment / detachment sensor” or “signal generation unit” in the present invention). The cassette sensor 44 is supported at its proximal end so as to be pivotable about an axis 44a extending in the scanning direction. When the sheet cassette 40 is not attached to the cassette attachment unit 4, the cassette sensor 44 is located at the position indicated by an alternate long and short dash line in FIG. 1. When the sheet cassette 40 is attached to the cassette attachment unit 4, the cassette sensor 44 is pushed by the upstream end of the sheet cassette 40 in the transport direction and swings to the position indicated by the solid line in FIG. 1. Then, based on the switching between the state where the cassette sensor 44 is located at the position shown by the solid line in FIG. 1 and the state where it is located at the position shown by the alternate long and short dash line, Attachment / detachment is detected, and a signal indicating the detection result ("signal related to vibration of the case" of the present invention) is generated.

<Paper output tray>
The sheet discharge tray 5 is positioned between the conveying roller 15 and the upper cassette mounting portion 4 in the vertical direction, and is positioned downstream of the conveying roller 15 in the conveying direction. The recording paper P for which printing by the printing unit 3 is completed is conveyed in the conveyance direction by the conveyance rollers 14 and 15, and is discharged to the paper discharge tray 5.

<Scanner>
The scanner 6 is provided above the print unit 3 of the housing 2. As shown in FIGS. 1 and 4, the scanner 6 includes a document table 51, a reading unit 52, and a cover 53. The document table 51 is provided at the upper end portion of the housing 2 and extends in the scanning direction and the transport direction. Further, the document table 51 is made of a transparent member such as glass. The document table 51 is a portion for placing a document G to be read by the reading unit 52. The reading unit 52 is located in a portion of the housing 2 located immediately below the document table 51. The reading unit 52 includes a plurality of reading elements (not shown) arranged in the transport direction, and is configured to be movable in the scanning direction. The reading unit 52 reads the document G placed on the document table 51 with a reading device (not shown) while moving in the scanning direction. Further, as shown in FIG. 4, the reading unit 52 is located at an initial position facing the left end portion in the scanning direction of the document table 51 when the document is not read. The configuration of the reading unit 52 is the same as that of the conventional case, and thus the detailed description of the reading unit 52 will be omitted.

  The cover 53 is disposed above the housing 2 and covers the document table 51. In addition, the cover 53 is swingably supported by a shaft 53a extending in the scanning direction at an upstream end in the transport direction. As a result, the cover 53 swings about the shaft 53a to a position to cover the document table 51 shown by a solid line in FIG. 1 and a position to expose the document table 51 shown by a dashed dotted line in FIG. It is movable. In the following, moving the cover 53 to a position covering the document table 51 may be referred to as “open the cover 53”, and moving the document table 51 to a position exposing the document table 51 “close the cover 53”. It may be.

  Further, the cover 53 is provided with an ADF (Auto Document Feeder) 54 (the “document conveying device” of the present invention). As shown in FIG. 4, the ADF 54 includes a document supply unit 61, a document discharge unit 62, a pickup roller 63, and conveyance rollers 64-66.

  The document supply unit 61 is a portion where the document G to be read by the reading unit 52 is disposed, and is provided at the upper end portion of the ADF 54. When the plurality of documents G are read by the reading unit 52, the plurality of documents are stacked in the vertical direction and arranged in the document supply unit 61. The document discharge unit 62 is a portion to which the document G after being read by the reading unit 52 is discharged, and is located below the document supply unit 61. The pickup roller 63 is provided at the left end of the document supply unit 61 in the scanning direction. The pickup roller 63 conveys one original G from the original supply unit 61 to the left in the scanning direction.

  The conveyance roller 64 is disposed on the left side of the document supply unit 61 in the scanning direction. The conveyance roller 65 is disposed at a position opposed to the reading unit 52 positioned at the initial position in the vertical direction. The conveyance roller 66 is located on the left side in the scanning direction relative to the document discharge unit 62. The document G conveyed by the pickup roller 63 is sequentially conveyed by the conveyance rollers 64 to 66, and is sent to the document discharge unit 62. Then, in the scanner 6, when the document G is conveyed by the conveyance rollers 64 to 66, the reading unit 52 reads the document G by sequentially reading a portion located at the lower end of the conveyance roller 65 of the document G. Can.

  In addition, a cover sensor 56 (an example of the “signal generation unit” of the present invention) is provided on the upper end of the casing 2 on the upper surface of the housing 2 corresponding to the cover 53. The cover sensor 56 is, for example, a switch that can be pressed from above. Further, the cover 53 is provided with a pressing portion 57 for pressing the cover sensor 56 from the upper side in a state of being located at a position covering the document table 51. The cover sensor 56 moves the cover 53 to the covering position and the exposing position on the basis of switching between the state of being pressed by the pressing portion 57 and the state of not being pressed by the pressing portion 57 (case 2) to generate a signal ("signal related to the vibration of the case" of the present invention) indicating the detection result. If such a cover sensor 56 is provided, for example, after reading by the reading unit 52, the cover 53 is not opened based on a signal from the cover sensor 56 (that the cover 53 has not been moved to the above-described exposed position). If the user does not detect the document G from the document table 51 when it is not detected, the user can be notified.

<Electric Configuration of Printer>
Next, the electrical configuration of the printer 1 will be described. The operation of the printer 1 is controlled by the control device 100. As illustrated in FIG. 5, the control device 100 includes a central processing unit (CPU) 101, a read only memory (ROM) 102, a random access memory (RAM) 103, a flash memory 104, and an application specific integrated circuit (ASIC) 105. The carriage motor 106, the inkjet head 12, the transport motor 107, the sheet feeding motor 108, the reading unit 52, the ADF 54 and the like are controlled. Further, the control device 100 receives signals from the encoder sensor 31, the cassette sensor 44, and the cover sensor 56.

  In the control device 100, only the CPU 101 may perform various processes, or only the ASIC 105 may perform various processes. The CPU 101 and the ASIC 105 cooperate to perform various processes. It may be one. Further, the control device 100 may be one in which one CPU 101 performs processing alone, or one in which a plurality of CPUs 101 share processing. Further, in the control device 100, one ASIC 105 may perform processing alone, or a plurality of ASICs 105 may share processing.

  In addition to the configuration described above, the printer 1 also includes a facsimile communication unit 109, an operation unit 110, and a display unit 111 ("notification unit" according to the present invention). A facsimile communication unit 109 is a unit that performs facsimile communication, and is connected to a telephone line. Specifically, when transmitting a facsimile, the facsimile communication unit 109 converts image data of the document G read by the reading unit 52 into data of facsimile communication and transmits the data. Further, the facsimile communication unit 109 converts the received data of the facsimile communication into image data, and causes the printing unit 3 to print.

  The operation unit 110 is configured by a button or the like provided on the housing 2. The user can operate the operation unit 110 to print, read an original, instruct facsimile transmission, set the printer 1 and the like to the printer 1. The display unit 111 is a liquid crystal display or the like, and displays information necessary for the operation of the operation unit 110, such as information about an error, and information necessary for the printer 1.

<Control during printing>
Next, control by the control device 100 when printing is performed in the printer 1 will be described. Here, in the standby state in which printing is not performed in the printer 1, the carriage 11 is located at the home position on the right side of the platen 13, which is indicated by an alternate long and short dash line in FIG. 2. Then, in the printer 1, when the print command is input, the control device 50 performs printing by performing control shown in FIG. 6.

  The process of FIG. 6 will be described in detail. When a print command is input to the printer 1, the control device 100 executes a paper feed process (S101). In the sheet feeding process, the control device 50 controls the sheet feeding motor 108 to cause the pickup roller 43 to supply one of the recording sheets P stored in any of the sheet cassettes 40 to the printing unit 3. Further, the control device 50 controls the conveyance motor 107 to cause the conveyance roller 14 to convey the recording sheet P until the leading edge of the recording sheet P is detected based on the signal from the media sensor 17.

  Subsequently, the control device 100 executes a sheet conveyance process (S102). In the sheet conveyance process, the control device 100 controls the conveyance motor 107 to cause the conveyance rollers 14 and 15 to convey the recording sheet P in the conveyance direction by a predetermined conveyance amount. The predetermined transport amount is, for example, the same length as the length of the nozzle row 9 in the transport direction.

  Subsequently, the control device 100 starts the discharge process (S103). In the ejection process, the control device 100 controls the carriage motor 106 to move the carriage 2 at the target velocity Va in the scanning direction, and controls the inkjet head 12 to direct the ink toward the recording paper P from the plurality of nozzles 10. Let it discharge.

  The decrease amount [Va-Vc] of the moving speed Vc of the carriage 11 from the target speed Va is less than or equal to the threshold Vn (S104: NO), and the distance D between the nozzle surface 12a and the recording paper P is a predetermined distance Dn. If it is above (S105: NO), the control device 100 continues the discharge process until the discharge process is completed (S106: NO). Here, the control device 100 detects the moving speed Vc based on a signal from the linear encoder 16 (encoder sensor 31). Further, the control device 100 detects the distance D based on the signal from the media sensor 17. The threshold value Vn and the predetermined distance Dn will be described in detail later.

  After the discharge process is completed (S106: YES), if printing on the recording paper P is not completed (S107: NO), the process returns to S102. That is, the printer 1 performs printing on the recording paper P by alternately and repeatedly executing the paper conveyance process and the discharge process. Then, when the printing on the recording paper P is completed (S107: YES), the control device 100 performs the paper discharge process (S108). In the paper discharge process, the control device 100 controls the conveyance motor 107 to cause the conveyance rollers 14 and 15 to convey the recording sheet P in the conveyance direction, thereby causing the recording sheet P to be discharged onto the paper discharge tray 5.

  On the other hand, when the decrease amount [Va-Vc] of the moving speed Vc of the carriage 11 from the target speed Va exceeds the threshold Vn during the discharge processing (S104: YES), or the nozzle surface 12a and the recording paper P When the distance D between them becomes smaller than the predetermined distance Dn (S105: YES), the control device 100 stops the discharge process (S109), and then controls the carriage motor 106 to move the carriage 11 before stopping. It moves in the direction opposite to the direction in which it was stored (S110). Then, the control device 100 causes the display unit 111 to display an error message for notifying that a paper jam has occurred (S111). Then, the process waits until the recording paper P jammed by the user is removed (S112: NO), and when the recording paper P is removed (S112: YES), the control device 100 controls the carriage motor 106 to execute the carriage. 11 is returned to the home position (S113), and the process returns to S101. Thereby, printing on a new recording sheet P is started.

  Next, the threshold value Vn used for the determination of S104 and the predetermined distance Dn used for the determination of S105 will be described. The control device 100 sets the threshold value Vn and the predetermined distance Dn by performing the process according to the flow shown in FIG. 7. The process of FIG. 7 is started, for example, when a print command is input to the printer 1, and is continued until printing is completed. That is, the process of FIG. 7 is a process performed while moving the carriage for the ejection operation.

  In the process of FIG. 7, first, the control device 100 sets the threshold value Vn to the first value V1 and sets the predetermined distance Dn to the first distance D1 (S201). The first value V1 is, for example, a value of about 3% of the target velocity Va. As a result, the first value V1 increases as the target speed Va increases. Alternatively, the first value V1 may be a uniform value regardless of the target velocity Va.

  Then, control device 100 does not detect that cover 53 is opened based on the signal from cover sensor 56 (S 202: NO), and based on the signal from cassette sensor 44, sheet cassette 40 is a cassette. While the removal from the mounting unit 4 is not detected (S206: NO), the threshold value Vn is maintained at the first value V1 and the predetermined distance Dn is maintained at the first distance D1.

  When it is detected that the cover 53 is opened based on the signal from the cover sensor 56 (S202: YES), the control device 100 sets the threshold value Vn to a second value V2 larger than the first value V1. Then, the predetermined distance Dn is set to a second distance D2 smaller than the first distance D1 (S203). The second value V2 is, for example, about 10% of the target velocity Va. As a result, the second value V2 increases as the target speed Va increases. Alternatively, the second value V2 may be a uniform value regardless of the target velocity Va.

  The control device 100 maintains the threshold value Vn at the second value V2 and the second predetermined distance Dn while the cover 53 is not detected to be closed based on the signal from the cover sensor 56 (S204: NO). Maintain at distance D2. Then, when it is detected that the cover 53 is closed based on a signal from the cover sensor 56 (S204: YES), it waits for a predetermined time Ta (S205: NO), and when the predetermined time Ta has elapsed. (S205: YES) Returning to S201, the threshold value Vn is set to the first value V1, and the predetermined distance Dn is set to the first distance D1.

  Also, the control device 100 detects the removal of the sheet cassette 40 from the cassette mounting unit 4 based on the signal from the cassette sensor 44 (S206: YES), and also sets the threshold value Vn to the second value V2. The predetermined distance Dn is set to the second distance D2 (S207). The control device 100 maintains the threshold value Vn at the second value V2 while it is not detected that the sheet cassette 40 is attached to the cassette attachment unit 4 based on the signal from the cassette sensor 44 (S208: NO). The predetermined distance Dn is maintained at the second distance D2. The control device 100 waits for Tb for a predetermined time (S209: NO) when it is detected that the paper cassette 40 is mounted on the cassette mounting unit 4 based on a signal from the cassette sensor 44 (S208: YES). When the predetermined time Tb has elapsed (S209: YES), the process returns to S201, the threshold value Vn is set to the first value V1, and the predetermined distance Dn is set to the first distance D1. Here, the time Tb may be the same time as the time Ta or may be a different time.

  In the present embodiment, as described above, the carriage 11 is stopped when the decrease amount [Va-Vc] of the moving velocity Vc of the carriage 11 from the target velocity Va during the ejection operation exceeds the threshold value Vn. As a result, when the moving speed of the carriage 11 is lowered by the recording paper P coming into contact with the nozzle surface 12a during the discharge operation, the carriage 11 is stopped and the nozzle surface 12a is rubbed against the recording paper P and damaged. It is possible to prevent it.

  At this time, the threshold value Vn is set to a small value from the viewpoint of preventing the carriage 11 from moving in a state where the recording paper P is in contact with the nozzle surface 12a, and the carriage 11 is It is preferable to stop.

  On the other hand, in a multifunction machine such as the printer 1, the user may read an original by the scanner 6 during printing by the printing unit 3, and at this time, the user opens and closes the cover 53. When the cover 53 is opened and closed during printing, external force is applied to the housing 2 so that vibration (hereinafter referred to as “vibration by external force”) is generated in the housing 2 and movement speed of the carriage 11 Vc May decrease. In the present embodiment, the cover 53 has the ADF 54, and the weight of the cover 53 is relatively large. Therefore, when the cover 53 is opened and closed, vibration due to external force is likely to occur.

  In the case where a plurality of cassette mounting units 4 and a plurality of sheet cassettes 40 corresponding thereto are provided as in the printer 1, the recording paper P is supplied from the sheet cassettes 40 mounted in a certain cassette mounting unit 4 and printing is performed. During the operation, the user may replenish the recording sheet P to the sheet cassette 40 mounted in another cassette mounting portion 4, and at this time, the mounting and dismounting of the sheet cassette with respect to the other cassette mounting portion 4 is performed. It will be. Then, even when the sheet cassette 40 is attached to and detached from the cassette mounting unit 4 during printing, vibration due to an external force may occur and the moving speed Vc of the carriage 11 may decrease.

  Further, in the present embodiment, the moving speed Vc of the carriage 11 is detected based on the signal from the linear encoder 16. The encoder scale 32 constituting the linear encoder 16 is a thin plate-like member, and both ends in the scanning direction are fixed to a fixing portion 21 a provided on the guide rail 21. The guide rails 21 are supported by support members 23 and 24 fixed to the housing 2. Therefore, when the vibration due to the external force is generated, the vibration is transmitted to the thin plate-like encoder scale 32 through the support members 23 and 24 and the guide rail 21, and the encoder scale 32 may be deformed. When the encoder scale 32 is deformed, the moving speed Vc of the carriage 11 detected based on the signal from the linear encoder 16 fluctuates.

  From these facts, if the threshold value Vn is set to a small value, the recording paper P has a nozzle even when the moving speed Vc of the carriage 11 detected based on the signal from the near encoder 16 is decreased due to the vibration due to the external force. There is a possibility that the carriage 11 may be stopped unnecessarily because it is erroneously determined to be in contact with the surface 12a.

  Further, the vibration due to the external force continues for a while from the time when the cover 53 is opened and closed. When the scanner 6 causes the reading unit 52 to read the document G, the user normally operates the operation unit 110 after opening the cover 53 and placing the document G on the document table 51. Then, the reading unit 52 reads the document G. Also, after reading the document G, the user opens the cover 53, takes out the document G from the document table 51, and closes the cover 53. Therefore, after the cover 53 is opened, there is a high possibility that vibration due to an external force is generated in a period until a predetermined time elapses after the cover 53 is closed.

  The vibration due to the external force continues for a while from the time when the sheet cassette 40 is attached to and detached from the cassette mounting unit 4. In addition, when replenishing the recording sheet P to the sheet cassette 40, normally, the user removes the sheet cassette 40 from the cassette mounting unit 4, then replenishes the recording sheet P to the sheet cassette 40, and then the sheet cassette 40 Mount on the mounting unit 4. Therefore, after the sheet cassette 40 is removed from the cassette mounting portion 4 and after the sheet cassette 40 is mounted to the cassette mounting portion 4, it is possible that vibration due to external force is generated in a period until a predetermined time passes. Is high.

  Therefore, in the present embodiment, as described above, the threshold value Vn is first set to the first value V1. Then, after the cover 53 is opened, a period until the time Ta elapses after the cover 53 is closed ("set period" of the present invention), the threshold value Vn is a second value V2 larger than the first value V1. The threshold value Vn is returned to the first value V1 after the passage of time Ta. In addition, after the paper cassette 40 is removed from the cassette mounting unit 4, the period until the time Tb elapses after the paper cassette 40 is mounted to the cassette mounting unit 4 (the “set period” of the present invention), threshold Vn Is set to the second value V2, and the threshold value Vn is returned to the first value V1 after the elapse of the time Tb.

  Thus, when vibration due to external force is not generated, the threshold value Vn is set to the small first value V1 to stop the carriage 11 at a stage where the degree of decrease of the moving speed Vc of the carriage 11 is small. It is possible to prevent the surface 12a from being scratched by being rubbed against the recording sheet P. On the other hand, when vibration due to external force is occurring, when the moving speed Vc of the carriage 11 is decreased due to the vibration due to external force by setting the threshold value Vn to the large second value V2, the nozzle surface 12a and the recording paper It is possible to prevent the carriage 11 from being unnecessarily stopped by erroneously judging that the movement speed Vc of the carriage 11 is reduced due to the contact with P.

  In some cases, the printer can selectively perform printing in any one of a plurality of types of printing modes having different target speeds Va of the carriage. In such a case, as described above, if the first value V1 and the second value V2 are speeds according to the target speed Va, then the first value V1 and the second value V2 are uniformly determined regardless of the target speed Va. The threshold value Vn can be made more appropriate for the target velocity Va than when it is set.

  In the present embodiment, after the cover sensor 56 outputs a signal indicating that the cover 53 is opened, and then outputs a signal indicating that the cover 53 is closed, until a predetermined time Ta elapses. A signal indicating that the sheet cassette 49 is attached to the cassette attachment unit 4 after the condition that the sheet cassette 49 is in a period and the cassette sensor 44 outputs a signal indicating that the sheet cassette 40 has been removed from the cassette attachment unit 4 The condition that the predetermined period Tb elapses after the output of each of the two signals corresponds to the "predetermined condition regarding signal" of the present invention.

  However, in the state where the threshold value Vn is set to the second value V2 larger than the first value V1, even if the nozzle surface 12a is in contact with the recording paper P, the moving speed of the carriage 11 from the target speed Va The decrease amount [Va-Vc] may be equal to or less than the second value V2. In this case, there is a possibility that the nozzle surface 12a may be rubbed against the recording sheet P and be damaged.

  Therefore, in the present embodiment, the carriage 11 is stopped even when the distance D between the nozzle surface 12a detected based on the signal from the media sensor 17 and the recording paper P is smaller than the predetermined distance Dn. . When the threshold Vn is set to the first value V1, the predetermined distance is set to the first distance D1, and when the threshold Vn is set to the second value V2, the predetermined distance Dn is shorter than the first distance D1. Set to distance D2.

  As a result, the amount of reduction [Va-Vc] from the target velocity Va of the moving velocity Vc of the carriage 11 when the nozzle surface 12a comes in contact with the recording paper P in a state in which vibration due to external force is generated is second Even in the case of the value V2 or less, the carriage 11 can be stopped by detecting that the recording paper P has come into contact with the nozzle surface 12a based on the detection result of the media sensor 17.

  When the recording sheet P comes into contact with the nozzle surface 12a, usually, any part of the nozzle surface 12a comes into contact with the recording sheet P, and the moving speed of the carriage 11 starts to decrease, and then the media sensor 17 and The distance to the recording paper P is equal to or less than the predetermined distance Dn. Therefore, when the threshold Vn is decreased and the predetermined distance Dn is decreased, the decrease in the moving speed Vc of the carriage 11 can be detected at an earlier stage by decreasing the threshold Vn. Therefore, when the vibration due to the external force is not generated, the threshold value Vn is set to the small first value V1, and the decrease of the moving speed Vc of the carriage 11 is detected.

  Further, in the state where the carriage 11 is stopped, there is a high possibility that the nozzle surface 12a is in contact with the recording sheet P. Therefore, when the user removes the recording sheet P in this state, there is a possibility that the nozzle surface 12a may be scratched and scratched with the recording sheet P due to the movement of the recording sheet P at this time.

  Therefore, in the present embodiment, after the carriage 11 is stopped, the carriage 11 is moved in the opposite direction to that before. As a result, when the ink jet head 12 is separated from the recording sheet P and the user removes the recording sheet P, the nozzle surface 12 a can be prevented from rubbing against the recording sheet P. At this time, since the carriage 11 is moved in the opposite direction to that before, the carriage 11 returns to the position before the nozzle surface 12 a and the recording paper P come in contact with each other. Therefore, the movement of the carriage 11 at this time does not cause the nozzle surface 12 a and the recording sheet P to rub.

  Further, in the present embodiment, after the carriage 11 is stopped and then moved in the opposite direction, the display unit 111 displays an error message for notifying that a paper jam has occurred. As a result, the user can grasp that a paper jam has occurred (that the recording paper P has come into contact with the nozzle surface 12a).

  As mentioned above, although the suitable embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment, and various modifications are possible within the scope of the claims.

  Although the cover 53 includes the ADF 54 in the above-described embodiment, the cover may not include the ADF. In this case, the weight of the cover is small compared to the case of the above-described embodiment. However, when the user vigorously opens and closes the cover, for example, even if the weight of the cover is small, vibration due to external force may occur.

  In the above embodiment, after the cover 53 is opened, the threshold value Vn is set to the second value V2 and the predetermined distance Dn is set to the second value in a period until the time Ta elapses after the cover 53 is closed. The distance was set to D2. Further, after the sheet cassette 40 is removed from the cassette mounting unit 4 and the sheet cassette 40 is mounted to the cassette mounting unit 4, the threshold value Vn is set to the second value V2 in a period until the time Tb elapses. The predetermined distance Dn was set to the second distance D2. However, the period in which the threshold value Vn is set to the second value V2 and the predetermined distance Dn is set to the second distance D2 is not limited to this.

  In the first modification, as shown in FIG. 8, the control device 100 sets the threshold value Vn to the first value V1 and sets the predetermined distance Dn to the first distance D1, as shown in FIG. 8 (S301). ). Then, in the control device 100, neither the fact that the cover 53 is opened nor the fact that the cover 53 is closed is detected based on the signal from the cover sensor 56 (S302: NO, S303: NO) And, based on the signal from the cassette sensor 44, it is not detected that the paper cassette 40 has been removed from the cassette mounting unit 4 and that the paper cassette 40 has been mounted on the cassette mounting unit 4 (S304: NO, During S305: NO), the threshold value Vn is maintained at the first value V1, and the predetermined distance Dn is maintained at the first distance D1.

  Then, when it is detected that the cover 53 is opened based on the signal from the cover sensor 56 (S302: YES), the control device 100 closes the cover 53 based on the signal from the cover sensor 56. When it is detected that the sheet cassette 40 has been removed from the cassette loading unit 4 based on the signal from the cassette sensor 44 (S303: YES), and When it is detected based on the signal from the sensor 44 that the sheet cassette 40 is attached to the cassette attachment unit 4 (S305: YES), the control device 100 sets the threshold value Vn to the second value V2, The predetermined distance Dn is set to the second distance D2 (S306). Thereafter, the threshold value Vn is maintained at the second value V2 and the predetermined distance Dn is maintained at the second distance D2 until ejection processing is performed K times (for example, twice) (S307: NO), K times When the ejection process is performed (S307: YES), the process returns to S301, the threshold value Vn is set to the first value V1, and the predetermined distance Dn is set to the first distance D1.

  In the first modification, vibration due to an external force continues for a while from the time of opening and closing of the cover 53 and the time of attachment and detachment of the sheet cassette 40 with respect to the cassette mounting unit 4. The threshold value Vn is set to a second value V2 which is larger than the first value V1 during a period until the discharge operation is performed K times after the attachment / detachment of the sheet cassette 40 with respect to . Accordingly, when the moving speed of the carriage 11 is decreased due to the vibration due to the external force, the carriage 11 is erroneously judged to be a decrease in the moving speed Vc of the carriage 11 due to the contact between the nozzle surface 12 a and the recording sheet P. Can be prevented from being unnecessarily stopped.

  In the first modification, the condition that the cover sensor 56 outputs a signal indicating that the cover 53 has been opened and closed (movement of the cover 53) and the period from when the discharge operation is completed K times is completed. And the condition that there is a period until the discharge operation is completed K times after the cassette sensor 44 outputs a signal indicating that the sheet cassette 40 has been attached to and detached from the cassette mounting unit 4; This corresponds to the "predetermined condition for signal" of the present invention.

  In the first modification, the threshold value Vn is set to the second value V2 until discharge processing is performed K times (for example, twice) from the time of opening and closing of the cover 53 and attachment and detachment of the sheet cassette 40 to the cassette mounting unit 4 And the predetermined distance Dn is maintained at the second distance D2, but the invention is not limited thereto. For example, the printer is provided with a timer, and the threshold Vn is maintained at the second value V2 for a predetermined setting period from the time of opening and closing the cover 53 and the attachment and detachment of the sheet cassette 40 to the cassette mounting unit 4 using measurement results by the timer. The predetermined distance Dn may be maintained at the second distance D2.

  Moreover, in the above-mentioned embodiment, although the printer 1 was provided with the two cassette mounting parts 4 and the paper cassette 40, it is not restricted to this. The printer 1 may include three or more cassette mounting units 4 and a sheet cassette 40. Even in this case, as in the above-described embodiment, while the recording sheet P stored in the sheet cassette 40 loaded in a certain cassette loading unit 4 is supplied and printing is performed, the user can use another cassette loading unit 4 At this time, the recording sheet P may be replenished by attaching and detaching the sheet cassette 40.

  In addition, the printer may include one cassette mounting unit 4 and one paper cassette 40. Even in this case, for example, when the case 2 has a manual feed tray in which the user directly sets the recording sheet P separately from the cassette mounting unit 4, the recording sheet P is supplied from the manual feed tray for printing. In the meantime, the user may attach and detach the recording sheet P by attaching and detaching the sheet cassette 40 in the cassette mounting unit 4.

  In addition, even when there is no manual feed tray, for example, when printing is performed only one sheet, while printing is being performed while one sheet of ink is supplied from the sheet cassette 40 mounted to the cassette mounting unit 4 In some cases, the user may attach and detach the sheet cassette 40 in the cassette mounting unit 4 to replenish the recording sheet P.

  Further, in the above-described embodiment, although the case where the cover provided on the housing of the printer is the cover of the scanner has been described as an example, the invention is not limited thereto. The cover provided on the housing of the printer may be other than the cover of the scanner. For example, if the printer has a slot for inserting a memory card, the housing may be provided with a cover for protecting the slot. Although the cover for protecting the slot is small, the cover may be engaged with the housing by a hook or the like. In such a case, for example, when the user opens the cover while disengaging the cover from the housing by the hook, vibration may occur in the housing.

  In the above embodiment, the threshold value Vn and the predetermined distance are respectively determined based on the opening and closing of the cover 53 (the detection result of the cover sensor 56) and the attachment and detachment of the sheet cassette 40 to the cassette mounting unit 4 (the detection result of the cassette sensor 44). Although Dn was set, it is not restricted to this. For example, when the printer includes the sheet cassette and the cassette mounting unit and does not include the scanner, the threshold value Vn and the predetermined distance Dn are set only based on the attachment and detachment of the sheet cassette to the cassette mounting unit. It is also good. Alternatively, in the case where the printer includes the scanner and does not include the sheet cassette and the cassette mounting unit (only the manual feed tray is provided), the threshold Vn and the predetermined value are determined only based on the opening and closing of the scanner cover. The distance Dn may be set.

  In addition, even when the printer includes both the scanner having the cover and the sheet cassette and the cassette mounting unit, only one of the opening and closing of the cover and the mounting and demounting of the sheet cassette with respect to the cassette mounting unit is performed. The threshold value Vn and the predetermined distance Dn may be set based on this.

  Moreover, in the above-mentioned embodiment, although opening and closing of the cover 53 was detected based on the signal from the cover sensor 56 and the threshold value Vn and the predetermined distance Dn were set based on the detection result, it is not restricted to this. In the second modification, the control device 100 executes the process according to the flow of FIG. 9A when a signal instructing to perform copying is input. Here, copying means reading a document by the scanner 6 and printing the read image by the printing unit 3.

  More specifically, when a signal instructing to perform copying is input, control device 100 indicates that copying is in progress (the signal relating to the vibration of the case of the present invention). ) Is generated (S401). In the second modification, the control device 100 also serves as the “signal generation unit” of the present invention.

  Then, the generation of the in-copy signal is continued until the copy is completed (S402: NO), and when the copy is completed (S402: YES), the generation of the in-copy signal is stopped (S403), and the processing is ended. .

  Then, in the second modification, as shown in FIG. 9B, when the signal during copying is not generated (S501: NO), the threshold value Vn is set to the first value V1, and the predetermined distance Dn is the first distance D1 is performed (S502). On the other hand, when the in-copy signal is generated (S501: YES), the threshold value Vn is set to the second value V2, and the predetermined distance Dn is set to the second distance D2 (S503).

  When copying a plurality of originals, the user may place the next original on the original stand 51 and cause the reading unit 52 to read it while the original is being printed. At this time, the cover 53 is repeatedly opened and closed, which may cause vibration due to an external force. Therefore, in the second modification, the threshold value Vn is set to a second value V2 larger than the first value while the signal during copying is generated. Accordingly, when the moving speed of the carriage 11 is decreased due to the vibration due to the external force, the carriage 11 is erroneously judged to be a decrease in the moving speed Vc of the carriage 11 due to the contact between the nozzle surface 12 a and the recording sheet P. Can be prevented from being unnecessarily stopped. In the second modification, the condition that the signal during copying is generated corresponds to the “predetermined condition regarding signal” of the present invention.

  Further, in the second modification, the case where the signal during copying is generated when the signal instructing to perform copying is described, but the present invention is not limited to this. For example, when another operation such as transmission of a facsimile or the like is performed by the reading unit 52, a signal indicating that the operation is being performed is generated, and while this signal is generated, the threshold value Vn is generated. May be set to the second value V2. In the case of facsimile transmission, etc., when a plurality of originals are read by the reading unit 52, the cover 53 may be repeatedly opened and closed to generate vibrations due to external force as described above.

  Further, in the above example, when opening and closing the cover 53 or attaching and detaching the sheet cassette 40 to and from the cassette mounting unit 4, it is assumed that the vibration due to the external force may occur. Although the case of changing has been described, it is not limited thereto.

  For example, in the third modification, as shown in FIG. 10, in addition to the printer 200 having a configuration similar to that of the printer 1, a human sensor 201 (book reader) is provided in a housing (not shown) of the printer 200. An example of the "signal generation unit" of the invention is provided. The human sensor 201 is a sensor for detecting that a person approaches, and generates a signal (“signal related to the vibration of the case” of the present invention) indicating that the person approaches. And in the modification 3, as shown in FIG. 11, the control apparatus 100 sets the threshold value Vn to the first value V1 and sets the predetermined distance Dn to the first distance D1, as in S201 of the above-described embodiment. It sets (S601). The control device 100 maintains the threshold value Vn at the first value V1 and the predetermined distance Dn as the first distance while the approach of the person is not detected based on the signal from the human sensor 201 (S602: NO). Maintain on D1. Then, when the approach of a person is detected based on the signal from the human sensor 201 (S602: YES), the control device 100 sets the threshold value Vn to the second value V2 and sets the predetermined distance Dn. The second distance D2 is set (S603). Thereafter, the threshold value Vn is maintained at the second value V2, the predetermined distance Dn is maintained at the second distance D2, and the K ejection processes are executed until K ejection processes are performed (S604: NO). If it is (S604: YES), the process returns to S601, the threshold value Vn is set to the first value V1, and the predetermined distance Dn is set to the first distance D1.

  When a person approaches the printer 1, vibration may occur due to external force. Therefore, in the third modification, when the human sensor 201 is provided in the housing of the printer 200 and the approach of a human is detected based on the signal from the human sensor 201, the threshold Vn is larger than the first value V1. It is set to the second value V2. Accordingly, when the moving speed of the carriage 11 is decreased due to the vibration due to the external force, the carriage 11 is erroneously judged to be a decrease in the moving speed Vc of the carriage 11 due to the contact between the nozzle surface 12 a and the recording sheet P. Can be prevented from being unnecessarily stopped. In the third modification, the condition that the human sensor 201 outputs a signal indicating that a person has approached corresponds to the “predetermined condition for a signal” in the present invention.

  In the above embodiment, when the threshold value Vn is set to the first value V1, the predetermined distance Dn is set to the first distance D1, and when the threshold value Vn is set to the second value V2, the predetermined distance Dn is set to the second value. Although set to the distance D2, it is not restricted to this. The predetermined distance Dn may be set to a fixed distance regardless of whether the threshold value Vn is set to the first value V1 or the second value V2.

  Further, in the above-described embodiment, when the decrease amount [Va-Vc] from the target velocity Va of the moving velocity Vc of the carriage 11 exceeds the threshold Vn, the distance D is a predetermined distance in addition to stopping the carriage. The carriage is stopped even when Dn or less, but it is not limited thereto. The discharge process may be stopped only when the decrease amount [Va-Vc] of the moving speed Vc of the carriage 11 from the target speed Va exceeds the threshold value Vn.

  Further, in the above example, when there is a possibility that vibration due to an external force is generated, the threshold value Vn is set to a larger value than when there is no possibility, but this is not restrictive.

  In the fourth modification, the printer is the same as the printer 200 of the fourth modification. In the fourth modification, the threshold value Vn and the predetermined distance Dn are set to fixed values (for example, Vn = V1, Dn = D1). And in the modification 4, as shown in FIG. 12, it is not detected that the cover 53 was opened and that the cover 53 was closed based on the signal from the cover sensor 56 (S701: NO, S702: NO, it is not detected based on the signal from the cassette sensor 44 that the paper cassette 40 has been removed from the cassette mounting unit 4 and that the paper cassette 40 has been mounted on the cassette mounting unit 4 (S703) : NO, S704: NO), based on the signal from the human sensor 201, while it is not detected that a person approaches (S705: NO), it waits.

  Then, when it is detected that the cover 53 is opened based on the signal from the cover sensor 56 (S 701: YES), when it is detected that the cover 53 is closed based on the signal from the cover sensor 56 (S702: YES), when it is detected that the paper cassette 40 is removed from the cassette mounting unit 4 based on the signal from the cassette sensor 44 (S703: YES), cassette mounting is performed based on the signal from the cassette sensor 44 When it is detected that the sheet cassette 40 is attached to the section 4 (S704: YES), and when it is detected that a person approaches based on the signal from the human sensor 201 (S705: YES) The control device 100 sets a vibration flag indicating that a vibration due to an external force may be generated (S706). Thereafter, until the discharge process is performed K times (S 707: NO), the vibration flag is maintained, and when the discharge process is performed K times (S 707: YES), the vibration flag is released. Then, the process returns to step S701.

  In the fourth modification, as shown in FIG. 13, after the processing of S801 to S803 similar to S101 to S103 of the above-described embodiment is performed at the time of printing in the printer, whether the vibration flag is set or not It determines (S804).

  If the vibration flag is not set (S804: NO), the reduction amount [Va-Vc] of the moving speed Vc of the carriage 11 from the target speed Va exceeds the threshold value Vn (S805: YES). The processes of S810 to S814 similar to S109 to S113 of the embodiment are executed. When the amount of decrease [Va-Vc] is equal to or less than the threshold value Vn (S805: NO), the process proceeds to S806. On the other hand, if the vibration flag is set (S804: YES), the process proceeds to S806 without performing the determination of S805.

  In S806, as in S105 of the above-described embodiment, it is determined whether the distance D between the nozzle surface 12a and the recording paper P is smaller than a predetermined distance Dn. Then, when the distance D between the nozzle surface 12a and the recording paper P is equal to or more than the predetermined distance Dn (S806: NO), the processing of S807 to S809 similar to S106 to S108 in the above embodiment is performed. On the other hand, when the distance D is smaller than the predetermined distance Dn (S806: YES), the processing of S810 to S814 is executed.

  As described in the above embodiment, the threshold value Vn is set to a small value to reduce the speed of the carriage 11 from the viewpoint of preventing the carriage 11 from moving in a state where the recording paper P contacts the nozzle surface 12a. It is preferable to detect contact with the nozzle surface 12 a of the recording paper P at a stage where However, if the threshold value Vn is too small, even when the moving speed Vc of the carriage 11 is reduced due to the vibration due to the external force, it is erroneously determined that the recording sheet P contacts the nozzle surface 12 a and the carriage 11 stops. It will be done.

  Therefore, in the fourth modification, as described above, the vibration flag is set when there is a possibility that the vibration due to the external force is generated, and when the vibration flag is set, the determination of S805 is not performed. That is, even if the decrease amount [Va-Vc] of the moving speed Vc of the carriage 11 with respect to the target speed Va exceeds the threshold value Vn, the carriage 11 is not stopped. Accordingly, when the moving speed of the carriage 11 is decreased due to the vibration due to the external force, the carriage 11 is erroneously judged to be a decrease in the moving speed Vc of the carriage 11 due to the contact between the nozzle surface 12 a and the recording sheet P. Can be prevented from being unnecessarily stopped.

  In the fourth modification, the vibration flag is set based on the detection results of the cover sensor 56, the cassette sensor 44, and the human sensor 201, but the vibration flag is set when the copy in-progress signal of the second modification is generated. You may

  Further, in the modified examples 1, 3 and 4, after the threshold value Vn is set to the second value V2 and the predetermined distance Dn is set to the second distance D2, a period until the discharge process is uniformly performed K times, the threshold value Although Vn is maintained at the second value V2 and the predetermined distance Dn is maintained at the second distance D2, the invention is not limited thereto. In the fifth modification, the printer can selectively perform printing in any of the normal print mode and the high-speed print mode in which the target speed Va is faster than the normal print mode. Then, as shown in FIG. 13, when printing is performed in the normal printing mode (S901: NO), the number K is set to K1 times (S902), and when printing is performed in the high speed printing mode, the number K is greater than K1 The number is also set to K2 times (S903). As a result, the period in which the threshold value Vn is set to the second value V2 ("the setting period" in the present invention) is changed according to the difference in the target speed Va between the normal printing mode and the high speed printing mode.

  In the high-speed printing mode, the time required for one discharge process is shorter than that in the normal printing mode. Therefore, when making the number of times K uniform regardless of the printing mode, the threshold value Vn is reliably maintained at the second value V2 and the predetermined distance Dn is maintained at the second distance D2 while vibration due to external force is generated. In order to do this, the number of times K is set in accordance with the target speed Va in the high speed printing mode. In this case, when printing is performed in the normal printing mode, the threshold value Vn is maintained at the second value V2 and the predetermined distance Dn is maintained at the second distance D2 even after the vibration due to the external force is resolved.

  On the other hand, in the fifth modification, the threshold value Vn is maintained at the second value V2 and the predetermined distance Dn is set to the second distance D2 in order to set the number K individually according to the target speed Va in each print mode. The maintenance period can be made appropriate.

  Further, in the fifth modification, the number of times K is changed according to the difference in the target speed Va due to the difference in the print mode, but for example, the opening and closing of the cover 53 and the attachment and detachment of the sheet cassette 40 to the cassette mounting unit 4 are detected The number of times K may be changed in accordance with the position of the carriage 11 in the scanning direction. At this time, the number K may be changed based on both the target velocity Va and the position of the carriage 11 in the scanning direction, or based on the position of the carriage 11 in the scanning direction regardless of the target velocity Va. The number of times K may be changed.

  Moreover, although the support members 23 and 24 supported the both ends of the guide rail 21 in the above-mentioned embodiment, it is not restricted to this. The support members 23 and 24 may support two other places apart in the scanning direction of the guide rail 21.

  In the above embodiment, the carriage 11 is movable in the scanning direction along the guide rails 21, and the two support members 23 and 24 fixed to the housing 2 are in the scanning direction of the guide rails 21. Although two distant places supported it, it is not restricted to this. For example, a member for movably supporting the carriage in the scanning direction may be directly fixed to the housing.

  Moreover, in the above-mentioned embodiment, although the both ends of the scanning direction of the encoder scale 32 were being fixed to the fixing | fixed part 21a of the guide rail 21, it is not restricted to this. Both ends of the encoder scale 32 in the scanning direction may be fixed to the guide rails 22 or the support members 23 and 24. Alternatively, both ends in the scanning direction of the encoder scale may be fixed to the housing 2 in a manner different from that described above.

  Further, in the above-described embodiment, the linear encoder 16 has the plurality of slits 35 in which the encoder scale 32 is arranged in the scanning direction, and the encoder sensor 31 detects the slits 35. I can not. For example, a linear encoder includes an encoder scale in which two types of regions ("detected portion" according to the present invention) in which the direction of the magnetic field is opposite to each other are alternately arranged in the scanning direction And a so-called magnetic encoder.

  Moreover, in the above-mentioned embodiment, although the moving speed of the carriage 11 was detected using the linear encoder, it is not restricted to this. The moving speed of the carriage 11 may be detected using a configuration other than a linear encoder. For example, an electromagnetic wave may be emitted toward the carriage 11 from the scanning direction, and the moving speed of the carriage 11 may be detected based on the frequency of the reflected wave.

  Moreover, in the above-mentioned embodiment, after stopping the carriage, the carriage 11 is moved in the opposite direction to that before, but the present invention is not limited thereto. After stopping the discharge operation, the carriage 11 may stand by at that position.

  In the above embodiment, when the discharge operation is stopped, an error message for notifying that the paper jam has occurred is displayed on the display unit 111 and the notification is performed, but the present invention is not limited thereto. . For example, notification may be performed by another method such as sounding an alarm from a speaker. In this case, a speaker for producing an alarm sound corresponds to the "notification unit" of the present invention. Furthermore, it may not be notified that a paper jam has occurred.

  Furthermore, although the example in which the present invention is applied to a printer that performs printing by discharging ink from the nozzles has been described above, the present invention is not limited thereto. For example, the present invention can be applied to a liquid discharge apparatus that discharges a liquid other than ink, such as a material of a wiring pattern of a wiring board.

1,200 printer 2 housing 4 cassette mounting unit 6 scanner 10 nozzle 11 carriage 12 inkjet head 16 linear encoder 31 encoder sensor 32 encoder scale 35 slit 17 media sensor 21 guide rail 23, 24 support member 40 paper cassette 43 cassette sensor 51 original 52 Reading unit 53 Cover sensor 54 ADF
100 controller 111 display unit 201 human sensor

Claims (24)

And
A cover attached to the housing;
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
A cover sensor for detecting that the cover has moved relative to the housing;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit during the discharge operation exceeds a threshold.
The controller further comprises:
The threshold is set to a first value when movement of the cover is not detected based on a signal from the cover sensor during movement of the carriage for the ejection operation.
When the movement of the cover is detected based on a signal from the cover sensor while moving the carriage for the ejection operation, the threshold value may be larger than the first value for a predetermined setting period. A liquid discharge apparatus characterized by being set to a value. Further comprising a scanner attached to the housing;
The scanner
A reading unit for reading a document;
An original table on which an original to be read by the reading unit is disposed;
The cover movable to a position covering the document table and a position exposing the document table;
The cover sensor detects movement of the cover to the covering position and the exposing position;
The control device sets the threshold to the second value for the setting period when movement of the cover to the covering position and the exposing position is detected based on a signal from the cover sensor. The liquid discharge device according to claim 1,   3. The liquid discharge device according to claim 2, wherein the cover includes a document conveying device that conveys a document to a position where the document can be read by the reading unit. The controller is
Repeat the discharge operation,
The set period is a period from when movement of the cover is detected based on a signal from the cover sensor to when the discharge operation is completed a predetermined number of times thereafter. The liquid discharge device according to any one of the above. The controller is
At least one of the setting period and the second value is determined based on at least one of the target speed and the position of the carriage at the time when movement of the cover is detected based on a signal from the cover sensor. The liquid discharge device according to any one of claims 1 to 4, wherein the liquid discharge device is changed.   The set period is a period from when the cover is moved to the exposing position to when a predetermined time elapses after the cover is moved to the covering position. The liquid discharge device according to 3. And
A cassette for containing a medium to be discharged;
A cassette mounting portion provided in the housing and to which the cassette is removably mounted;
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
An attachment / detachment sensor for detecting attachment / detachment of the cassette with respect to the cassette attachment portion;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit during the discharge operation exceeds a threshold.
The controller further comprises:
When the mounting and demounting of the cassette is not detected based on a signal from the mounting and demounting sensor while moving the carriage for the discharge operation, the threshold is set to a first value.
The second threshold value may be larger than the first value for a predetermined setting period when the attachment and detachment of the cassette is detected based on a signal from the attachment / detachment sensor while moving the carriage for the ejection operation. A liquid discharge apparatus characterized by being set to a value. A plurality of the cassettes,
8. The liquid discharge device according to claim 7, further comprising: a plurality of cassette mounting units respectively corresponding to the plurality of cassettes. The controller is
Repeat the discharge operation,
The set period is a period from when the attachment and detachment of the cassette is detected based on the signal from the attachment and detachment sensor and thereafter, the discharge operation is completed a predetermined number of times. The liquid ejection device according to claim 1. The controller is
At least one of the setting period and the second value based on at least one of the target speed and the position of the carriage at the time when the mounting and demounting of the cassette is detected based on a signal from the mounting and demounting sensor. 10. The liquid discharge device according to claim 9, wherein   The setting period is a period from when the cassette is removed from the cassette storage unit to when a predetermined time elapses after the cassette is mounted in the cassette storage unit. Or the liquid discharge apparatus described in 8. The controller is
The liquid discharge apparatus according to any one of claims 1 to 11, wherein after the carriage is stopped, the carriage is moved in a direction opposite to the direction in which the carriage was moved before the stop. And a notification unit,
The control device causes the notification unit to notify when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit exceeds the threshold. The liquid discharge device according to any one of claims 1 to 12, characterized in that And a distance sensor mounted on the carriage for detecting distance information on a distance between the nozzle surface and the discharge medium.
The controller is
Even when the amount of decrease from the target velocity of the movement velocity of the carriage detected based on the signal from the velocity detection unit during the ejection operation does not exceed the threshold value, the signal from the distance sensor is used. The carriage is stopped when the distance indicated by the distance information detected based on the distance is shorter than a predetermined distance,
The controller further comprises:
When the threshold is set to the first value, the predetermined distance is set to the first distance,
The liquid discharge device according to any one of claims 1 to 13, wherein when the threshold value is set to the second value, the predetermined distance is set to a second distance shorter than the first distance. A guide rail extending in the scanning direction and movably supporting the carriage in the scanning direction;
The liquid according to any one of claims 1 to 14, further comprising: a pair of support members fixed to the housing, arranged apart from each other in the scanning direction, and supporting the guide rails. Discharge device. The speed detection unit
An encoder sensor mounted on the carriage;
A thin plate-like encoder scale having a plurality of detected portions detected by the encoder sensor, provided in the housing, extending in the scanning direction, and having both ends fixed in the scanning direction with respect to the housing; The liquid discharge device according to any one of claims 1 to 14, characterized in that A guide rail extending in the scanning direction and movably supporting the carriage in the scanning direction;
And a pair of support members fixed to the housing and spaced apart from each other in the scanning direction and supporting the guide rails.
17. The liquid discharge device according to claim 16, wherein both ends of the encoder scale in the scanning direction are fixed to either the guide rail or the support member. And
A cover attached to the housing;
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
A cover sensor for detecting that the cover has moved relative to the housing;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit during the discharge operation exceeds a threshold.
The controller further comprises:
When movement of the cover is detected based on a signal from the cover sensor while moving the carriage for the ejection operation, the movement from the speed detection unit is performed during the ejection operation for a predetermined setting period. A liquid discharge apparatus characterized by continuing to move the carriage without stopping even if the amount of decrease from the target velocity of the movement speed of the carriage detected based on a signal exceeds a threshold. And
A cassette for containing a medium to be discharged;
A cassette mounting unit provided in the housing and to which the cassette is detachably mounted;
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
An attachment / detachment sensor for detecting attachment / detachment of the cassette with respect to the cassette attachment portion;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit during the discharge operation exceeds a threshold.
The controller further comprises:
When the attachment and detachment of the cassette is detected based on a signal from the attachment and detachment sensor while moving the carriage for the ejection operation, the velocity detection unit is operated during the ejection operation for a predetermined setting period. A liquid discharge apparatus characterized by continuing to move the carriage without stopping even if the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal of (4) exceeds a threshold. And
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
A human sensor provided in the housing for detecting an approach of a human;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit during the discharge operation exceeds a threshold.
The controller further comprises:
When the approach of a person is not detected based on a signal from the human sensor while moving the carriage for the ejection operation, the threshold is set to a first value,
When the mounting and demounting of the cassette is detected based on a signal from the human sensor while moving the carriage for the ejection operation, the threshold value may be larger than the first value for a predetermined setting period. A liquid discharge apparatus characterized by setting to two values. And
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
A human sensor provided in the housing for detecting an approach of a human;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit during the discharge operation exceeds a threshold.
The controller further comprises:
When the approach of a person is detected based on a signal from the human sensor while moving the carriage for the ejection operation, the speed detection unit is operated during the ejection operation for a predetermined setting period. A liquid discharge apparatus characterized by continuing to move the carriage without stopping even if the amount of decrease from the target speed of the movement speed of the carriage detected based on the signal of (4) exceeds a threshold. And
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
A signal generation unit that generates a signal related to the vibration of the housing due to an external force;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease with respect to the target velocity of the movement velocity of the carriage detected based on the signal from the velocity detection unit during the ejection operation exceeds a threshold.
The controller further comprises:
Determining whether a predetermined condition for the signal is satisfied;
When the predetermined condition is not satisfied, the threshold is set to a first value,
A liquid discharge apparatus characterized by setting the threshold value to a second value larger than the first value when the predetermined condition is satisfied. And
A carriage housed in the housing and moving in the scanning direction;
A liquid discharge head mounted on the carriage and having a nozzle and a nozzle surface on which the nozzle is formed;
A speed detection unit for detecting the moving speed of the carriage;
A signal generation unit that generates a signal related to the vibration of the housing due to an external force;
And a controller.
The controller is
Causing the liquid discharge head to perform a discharge operation to discharge the liquid from the nozzles toward the discharge medium while moving the carriage at a target speed;
The carriage is stopped when the amount of decrease with respect to the target velocity of the movement velocity of the carriage detected based on the signal from the velocity detection unit exceeds the threshold during the ejection operation.
The controller further comprises:
Determining whether a predetermined condition for the signal is satisfied;
When the predetermined condition is satisfied, the carriage is moved even if the reduction amount from the target speed of the movement speed of the carriage detected based on the signal from the speed detection unit exceeds the threshold during the discharge operation. A liquid discharge apparatus characterized by continuing to move without stopping. The controller is
When the signal is not received, it is determined that the predetermined condition is not satisfied,
24. The liquid discharge apparatus according to claim 22, wherein when the signal is received, it is determined that the predetermined condition is satisfied.

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