Patent Grant
10994557
The present invention relates to a printing apparatus and a control method.
As a method of improving the printing speed of a printing apparatus, overlap continuous feeding of printing media has been proposed. Overlap continuous feeding is a conveying method of overlaying the leading edge of a succeeding printing medium on the trailing edge of a preceding printing medium and conveying them in this state when continuously printing images on a plurality of printing media (for example, Japanese Patent Laid-Open No. 2015-229555). The overlap continuous feeding can further improve throughput as compared to a conveying method of starting feeding of a succeeding printing medium after the end of printing on a preceding printing medium or a conveying method of continuously conveying printing media while reducing the gap between them. Japanese Patent Laid-Open No. 2015-229555 proposes executing overlap continuous feeding on condition that printing on the preceding printing medium ends.
If a printing medium is conveyed in a tilting state, the image print position may shift. As a measure against this, skew correction is performed to correct the tilt of the printing medium by abutting the leading edge of the printing medium against a pair of rollers. The skew correction timing for the succeeding printing medium needs to be set appropriately in association with overlap continuous feeding of the preceding printing medium.
The present invention improves the overlap continuous feeding technique for printing media.
According to an aspect of the present invention, there is provided a printing apparatus comprising: a feeding unit configured to feed a printing medium; a conveying unit configured to convey the printing medium fed by the feeding unit; a printing unit configured to perform printing on the printing medium conveyed by the conveying unit; and a control unit configured to control the feeding unit and the conveying unit, wherein the conveying unit includes a pair of rollers, the control unit can execute skew correction of driving the feeding unit and causing a leading edge of the printing medium to abut against a nip portion of the pair of rollers which stops, the control unit can execute control to convey a preceding printing medium and a succeeding printing medium by the pair of rollers in a state in which a trailing edge portion of the preceding printing medium and a leading edge portion of the succeeding printing medium overlap, the control unit sets an execution timing of the skew correction for the succeeding printing medium based on positions of the preceding printing medium and the succeeding printing medium if a predetermined condition is met, and the predetermined condition is that the preceding printing medium reaches a position at which a remaining print range for the preceding printing medium by the printing unit equals a predetermined print range.
Further features of the present invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings).
Note that “print” includes not only formation of significant information such as a character or graphic pattern but also formation of an image, design, or pattern on print media in a broader sense regardless of whether the information is significant or insignificant or has become obvious to allow human visual perception. Additionally, in this embodiment, “print media” are assumed to be paper sheets but may be fabrics or plastic films. A sheet-shaped printing medium will be referred to as a print sheet here.
Before an explanation of the operation of the printing apparatus 100, the arrangement will be described mainly with reference to a state ST1 shown in
The printing unit includes a printhead 7 and a carriage 10. The printhead 7 performs printing on the print sheet 1. In this embodiment, the printhead 7 is an inkjet printhead that performs printing on the print sheet 1 by discharging ink. The printhead 7 includes a plurality of arrays of ink discharge nozzles. Each array includes a plurality of ink discharge nozzles. The plurality of ink discharge nozzles are arranged in the conveying direction of the print sheet 1. The length of a range in which the printhead 7 can print at once in the conveying direction is sometimes called a nozzle length. A platen 8 that supports the back surface of the print sheet 1 is arranged at a position facing the printhead 7. The carriage 10 with the printhead 7 mounted on it moves in a direction crossing the conveying direction.
The conveying device is roughly divided into a feeding mechanism, a conveying mechanism, and a discharging mechanism. The feeding mechanism feeds the print sheet 1 stacked on the feeding tray 11 to the conveying mechanism, and the conveying mechanism conveys the fed print sheet 1 to the discharging mechanism. The discharging mechanism conveys the print sheet 1 to the outside of the printing apparatus 100. Conveyance of the print sheet 1 under printing is mainly performed by the conveying mechanism. The print sheet 1 is sequentially conveyed by the feeding mechanism, the conveying mechanism, and the discharging mechanism in this way. The feeding mechanism side will be referred to as an upstream side in the conveying direction, and the discharging mechanism side will be referred to as a downstream side in the conveying direction.
The feeding mechanism includes a pickup roller 2, a feeding roller 3, and a feeding driven roller 4. The pickup roller 2 abuts against the uppermost print sheet 1 stacked on the feeding tray 11 and picks up the print sheet. The feeding roller 3 is configured to feed the print sheet 1 picked up by the pickup roller 2 to the downstream side in the conveying direction. The feeding driven roller 4 is biased and pressed against the feeding roller 3 by an elastic member (for example, a spring) (not shown), and feeds the print sheet 1 by nipping it with the feeding roller 3.
As shown in
Referring back to
Conveying guides 15 that guide the conveyance of the print sheet 1 are provided in the conveyance section from a nip portion (to be referred to as a feeding nip portion) formed by the feeding roller 3 and the feeding driven roller 4 to a nip portion (to be referred to as a conveying nip portion) formed by the conveying roller 5 and the pinch roller 6.
The discharging mechanism includes a discharging roller 9 and spurs 12 and 13. The discharging roller 9 discharges the print sheet 1 printed by the printhead 7 to the outside of the apparatus. The spurs 12 and 13 rotate in contact with the printed surface of the print sheet 1 printed by the printhead 7. The spur 13 on the downstream side is biased and pressed against the discharging roller 9 by an elastic member (for example, a spring) (not shown). The spur 12 on the upstream side is arranged on the downstream side of the printhead 7. No discharging roller 9 is arranged at a position facing the spur 12. The spur 12 suppresses floating of the print sheet 1 and is called a pressing spur.
The printing apparatus 100 includes a sheet detection sensor 16. The sheet detection sensor 16 is a sensor configured to detect the leading edge and the trailing edge of the print sheet 1, and is formed from, for example, an optical sensor. The sheet detection sensor 16 is provided on the downstream side of the feeding roller 3 in the conveying direction. A sheet pressing lever 17 is a lever configured to press the trailing edge portion of the preceding print sheet 1 (also called a preceding printing medium or preceding sheet) and overlay the leading edge portion of the succeeding print sheet 1 (also called a succeeding printing medium or succeeding sheet). Note that the leading edge portion and the trailing edge portion of the print sheet 1 mean the downstream side end and the upstream side end in the conveying direction, respectively. The sheet pressing lever 17 is biased by an elastic member (for example, a spring) (not shown) counterclockwise in
An example of the arrangement of a printing system including the control unit of the printing apparatus 100 and an information processing apparatus 214 capable of transmitting print data to the printing apparatus 100 will be described next with reference to
The printing apparatus 100 includes an MPU 201. The MPU 201 can control the operation of each component of the printing apparatus 100 and also performs data processing and the like. The MPU 201 can execute conveyance control of the print sheet 1 such that the trailing edge portion of the preceding sheet and the leading edge portion of the succeeding sheet overlap, as will be described later. A ROM 202 stores data and programs to be executed by the MPU 201. A RAM 203 is a RAM that temporarily stores data processed by the MPU 201 or print data received from the information processing apparatus 214. Note that other storage devices can be used in place of the ROM 202 and the RAM 203.
A printhead driver 207 drives the printhead 7. A carriage motor driver 208 drives a carriage motor 204 that is the driving source of a driving mechanism for moving the carriage 10. A conveying motor 205 is the driving source of a driving mechanism for the conveying roller 5 and the discharging roller 9. The conveying motor 205 is driven by a conveying motor driver 209.
A feeding motor 206 is the driving source of a driving mechanism for the pickup roller 2 and the feeding roller 3. The feeding motor 206 is driven by a feeding motor driver 210.
The MPU 201 controls the printing operation (ink discharge and movement of the printhead 7) of the printhead 7 via the printhead driver 207 and the carriage motor driver 208. The MPU 201 also executes conveyance control of the print sheet 1 via the conveying motor driver 209 and the feeding motor driver 210.
The information processing apparatus 214 is, for example, a personal computer or a portable terminal (for example, a smartphone or tablet terminal) and functions as the host computer of the printing apparatus 100. The information processing apparatus 214 includes a CPU 214a, a storage device 214b, and an I/F unit (interface unit) 214c. The CPU 214a executes a program stored in the storage device 214b. The storage device 214b is a RAM, a ROM, or a hard disk, and stores programs to be executed by the CPU 214a and various kinds of data. The storage device 214b stores a printer driver 2141 configured to control the printing apparatus 100. The information processing apparatus 214 can generate print data by executing the printer driver 2141. The information processing apparatus 214 and the printing apparatus 100 can transmit/receive data via the I/F unit 214c and an I/F unit 213.
<Example of Overlap Continuous Feeding>
The overlap continuous feeding operation will time-serially be described with reference to
A description will be made with reference to the state ST1 shown in
When the pickup roller 2 rotates, an uppermost print sheet (preceding sheet 1-A) stacked on the feeding tray 11 is picked up. The preceding sheet 1-A picked up by the pickup roller 2 is conveyed by the feeding roller 3 that is rotating in the same direction as the pickup roller 2. The feeding roller 3 is also driven by the feeding motor 206. This embodiment will be explained using an arrangement including the pickup roller 2 and the feeding roller 3. However, the arrangement may include only the feeding roller configured to feed a print sheet stacked on the stacking unit.
When the sheet detection sensor 16 provided on the downstream side of the feeding roller 3 detects the leading edge of the preceding sheet 1-A, the feeding motor 206 is driven at a relatively high rotational speed. Here, the pickup roller 2 and the feeding roller 3 rotate at, for example, 20 inches/sec.
A description will be made with reference to a state ST2 shown in
A description will be made with reference to a state ST3 shown in
Note that the aligning operation is performed by abutting the leading edge of the print sheet 1 against the conveying nip portion to temporarily locate the start at the position of the conveying roller 5 and then controlling the rotation amount of the conveying roller 5 using the position of the conveying roller 5 as a reference.
The printing apparatus 100 according to this embodiment is a serial type printing apparatus with the printhead 7 mounted on the carriage 10. The printing operation for the print sheet 1 is performed by repeating a conveying operation and an image forming operation. The conveying operation is an operation of causing the conveying roller 5 to perform intermittent conveyance of a print sheet by a predetermined amount. The image forming operation is an operation of discharging ink from the printhead 7 while moving the carriage 10 on which the printhead 7 is mounted when the conveying roller 5 stops. The image forming operation is sometimes called print scan, and the unit of the range of printing in one print scan is sometimes called a “row”.
When the preceding sheet 1-A is aligned, the feeding motor 206 is switched to low-speed driving again. That is, the pickup roller 2 and the feeding roller 3 rotate at 7.6 inches/sec. When the conveying roller 5 intermittently conveys the print sheet 1 by a predetermined amount, the feeding roller 3 is also intermittently driven by the feeding motor 206. That is, if the conveying roller 5 rotates, the feeding roller 3 also rotates. If the conveying roller 5 stops, the feeding roller 3 also stops. The rotational speed of the feeding roller 3 is lower than that of the conveying roller 5. For this reason, the print sheet 1 is stretched between the conveying roller 5 and the feeding roller 3. In addition, the feeding roller 3 is dragged by the print sheet 1 conveyed by the conveying roller 5.
When the feeding motor 206 is intermittently driven, the drive shaft 19 also rotates. However, the rotational speed of the pickup roller 2 is lower than that of the conveying roller 5, as described above. For this reason, the pickup roller 2 is dragged by the print sheet 1 conveyed by the conveying roller 5. Hence, the pickup roller 2 rotates ahead of the drive shaft 19. More specifically, the projection 19a of the drive shaft 19 is apart from the first surface 2a and is in contact with the second surface 2b. Hence, even if the trailing edge of the preceding sheet 1-A passes through the pickup roller 2, the second print sheet (succeeding sheet 1-B) is not immediately picked up. If the preceding sheet 1-A passes through the feeding nip portion, and the drive shaft 19 is driven for a predetermined time, the projection 19a abuts against the first surface 2a. Accordingly, the rotation of the drive shaft 19 is transmitted to the pickup roller 2, and the pickup roller 2 starts rotating. A time lag to pickup of the succeeding sheet 1-B is thus generated.
A description will be made with reference to a state ST4 shown in
That is, to ensure a predetermined time interval from detection of the trailing edge of the preceding sheet 1-A by the sheet detection sensor 16 to detection of the leading edge of the succeeding sheet 1-B, the trailing edge portion of the succeeding sheet 1-B and the leading edge portion of the preceding sheet 1-A are spaced apart by a predetermined distance. For this purpose, the concave portion 2c of the pickup roller 2 is set to, for example, about 70°.
A description will be made with reference to a state ST5 shown in
A description will be made with reference to a state ST6 shown in
A description will be made with reference to a state ST7 shown in
The position of the leading edge of the succeeding sheet 1-B is calculated from the rotation amount of the feeding roller 3 after the leading edge of the succeeding sheet 1-B is detected by the sheet detection sensor 16, and controlled based on the calculation result. At this time, the preceding sheet 1-A is undergoing the image forming operation by the printhead 7 based on the print data.
A description will be made with reference to a state ST8 shown in
A description will be made with reference to a state ST9 shown in
When the succeeding sheet 1-B is aligned, the feeding motor 206 is switched to low-speed driving again. That is, the pickup roller 2 and the feeding roller 3 rotate at 7.6 inches/sec. If print data still exists after the succeeding sheet 1-B, the process returns to the state ST4 in
In this way, the printing operation can continuously be performed for a plurality of print sheets 1 while performing overlap continuous feeding.
<Execution Timing of Skew Correction Operation>
In a case in which the skew correction operation of the succeeding sheet 1-B is performed in a state in which the trailing edge of the preceding sheet 1-A is located on the upstream side of the conveying nip portion, when the conveying roller 5 is driven, the preceding sheet 1-A and the succeeding sheet 1-B are caught in the conveying nip portion and conveyed. That is, overlap continuous feeding starts. The length from the trailing edge of the preceding sheet 1-A to the conveying nip portion is the overlap amount in overlap continuous feeding when performing the skew correction operation of the succeeding sheet 1-B.
Hence, the execution timing of the skew correction operation of the succeeding sheet 1-B is an important timing in controlling the overlap continuous feeding and the overlap amount. For example, it is necessary to avoid the succeeding sheet 1-B from overlapping the range of image formation on the preceding sheet 1-A. In addition, a large overlap amount is advantageous from the viewpoint of throughput.
In this embodiment, the execution timing of the skew correction operation for the succeeding sheet 1-B can be set based on the positions of the preceding sheet 1-A and the succeeding sheet 1-B when a predetermined condition is met. The predetermined condition is the condition of the position of the preceding sheet 1-A. More specifically, the condition is that the preceding sheet 1-A reaches a position at which a predetermined print range remains as the print range on the preceding sheet 1-A by the printing unit.
This makes it possible to ensure a larger overlap amount while smoothly performing image formation on the preceding sheet 1-A. The printing apparatus 100 according to this embodiment is a serial type printing apparatus. Hence, the remaining print range on the preceding sheet 1-A is defined using the remaining print scan count (the number of rows) as a reference, and the skew correction operation is executed when the conveying roller 5 and the pinch roller 6 stop to cause the printhead 7 to print the row immediately before the last row on the preceding sheet 1-A. In an example of processing to be described below, when the remaining print scan count is 1 (final print scan/last row), the execution timing of the skew correction operation of the succeeding sheet 1-B is set.
<Example of Processing>
An example of processing of the MPU 201 to execute the above-described overlap continuous feeding will be described next.
In step S1, when a print start instruction is transmitted from the information processing apparatus 214 via the I/F unit 213, the printing operation starts. In step S2, the feeding operation of the preceding sheet 1-A starts. More specifically, the feeding motor 206 is driven at a low speed. The pickup roller 2 rotates at 7.6 inches/sec. The pickup roller 2 picks up the preceding sheet 1-A, and the feeding roller 3 feeds the preceding sheet 1-A toward the printhead 7.
In step S3, the sheet detection sensor 16 detects the leading edge of the preceding sheet 1-A. When the sheet detection sensor 16 detects the leading edge of the preceding sheet 1-A, the feeding motor 206 is switched to high-speed driving in step S4. That is, the pickup roller 2 and the feeding roller 3 rotate at 20 inches/sec. The rotation amount of the feeding roller 3 after the detection of the leading edge of the preceding sheet 1-A by the sheet detection sensor 16 is controlled, thereby abutting the leading edge of the preceding sheet 1-A against the conveying nip portion and performing the skew correction operation of the preceding sheet 1-A in step S5.
In step S6, the preceding sheet 1-A is aligned based on print data. That is, by controlling the rotation amount of the conveying roller 5, the preceding sheet 1-A is conveyed to a print start position using, as the reference, the position of the conveying roller 5 based on the print data. In step S7, the feeding motor 206 is switched to low-speed driving. In step S8, ink is discharged from the printhead 7 to the preceding sheet 1-A, thereby starting the printing operation.
More specifically, the conveying operation of intermittently conveying the preceding sheet 1-A by the conveying roller 5 and the image forming operation (ink discharge operation) of moving the carriage 10 and discharging ink from the printhead 7 are repeated, thereby performing the printing operation for the preceding sheet 1-A. The feeding motor 206 is intermittently driven at a low speed in synchronism with the operation of intermittently conveying the preceding sheet 1-A by the conveying roller 5. That is, the pickup roller 2 and the feeding roller 3 intermittently rotate at 7.6 inches/sec.
In step S9, it is determined whether the print data of the next page exists. If the print data of the next page does not exist, the process advances to step S25. If the printing operation for the preceding sheet 1-A ends in step S25, the preceding sheet 1-A is discharged, and the printing operation ends in step S26.
If the print data of the next page exists, the feeding operation of the succeeding sheet 1-B starts in step S10. More specifically, the pickup roller 2 picks up the succeeding sheet 1-B, and the feeding roller 3 feeds the succeeding sheet 1-B toward the printhead 7. The pickup roller 2 rotates at 7.6 inches/sec. Since the concave portion 2c of the pickup roller 2 is provided large relative to the projection 19a of the drive shaft 19, as described above, the succeeding sheet 1-B is conveyed while keeping a predetermined interval to the trailing edge of the preceding sheet 1-A.
In step S11, the sheet detection sensor 16 detects the leading edge of the succeeding sheet 1-B. When the sheet detection sensor 16 detects the leading edge of the succeeding sheet 1-B, the feeding motor 206 is switched to high-speed driving in step S12. That is, the pickup roller 2 and the feeding roller 3 rotate at 20 inches/sec. The rotation amount of the feeding roller 3 after the detection of the leading edge of the succeeding sheet 1-B by the sheet detection sensor 16 is controlled, thereby conveying the succeeding sheet 1-B such that the leading edge of the succeeding sheet 1-B comes to a predetermined position (determination position) spaced apart from the conveying nip portion to the upstream side by a predetermined amount in step S13. The preceding sheet 1-A is intermittently conveyed based on the print data. By continuously drive the feeding motor 206 at a high speed, an overlap state in which the leading edge portion of the succeeding sheet 1-B overlaps the trailing edge portion of the preceding sheet 1-A is formed.
In step S14, the execution timing to execute the skew correction operation of the succeeding sheet 1-B is set. In this embodiment, there are two execution timings. One is a timing (sometimes called post-discharging operation timing) after the conveying operation of the preceding sheet 1-A is performed until the trailing edge of the preceding sheet 1-A passes through the conveying nip portion. The remaining one is a timing (sometimes called post-line-spacing conveying operation timing) after the conveying operation of the preceding sheet 1-A is performed up to the position of the image forming operation (final print scan) of the last row. The post-line-spacing conveying operation timing includes a case in which the trailing edge of the preceding sheet 1-A has already passed through the conveying nip portion (overlap continuous feeding is not performed) and a case in which the trailing edge of the preceding sheet 1-A is located on the upstream side of the conveying nip portion (overlap continuous feeding is performed). Details of the setting will be described later.
If the post-discharging operation timing is set as the result of the setting of step S14, the process advances to step S27. If the post-line-spacing conveying operation timing is set, the process advances to step S15.
In step S15, it is determined whether the conveying operation of the preceding sheet 1-A stops. If the conveying operation stops, the process advances to step S16. If the conveying operation does not stop, the process waits until it stops. In step S16, the leading edge of the succeeding sheet 1-B is abutted against the conveying nip portion, and the skew correction operation of the succeeding sheet 1-B is performed. In the setting of step S14, if the trailing edge of the preceding sheet 1-A is located on the upstream side of the conveying nip portion, the skew correction operation of the succeeding sheet 1-B is executed while maintaining the overlap state of the preceding sheet 1-A and the succeeding sheet 1-B.
Note that in this embodiment, driving of the feeding roller 3 is assumed to start for skew correction of the succeeding sheet 1-B after stopping of the conveying operation. However, it is only necessary to rest the conveying roller 5 when abutting the succeeding sheet 1-B against the conveying nip portion. Hence, driving of the feeding roller 3 may start for skew correction of the succeeding sheet 1-B a predetermined time before the stopping of the conveying operation.
If it is determined in step S17 that the image forming operation of the last row on the preceding sheet 1-A ends, the succeeding sheet 1-B is aligned. At this time, there are a case in which the preceding sheet 1-A and the succeeding sheet 1-B are conveyed without overlapping and a case in which they are conveyed while making the overlap portion between the trailing edge portion of the preceding sheet 1-A and the leading edge portion of the succeeding sheet 1-B caught in the conveying nip portion.
If the image forming operation of the last row on the preceding sheet 1-A ends in step S27, the discharging operation of the preceding sheet 1-A is performed in step S28. The discharging operation of the preceding sheet 1-A is performed until the trailing edge of the preceding sheet 1-A at least passes through the conveying nip portion. In this embodiment, the preceding sheet 1-A is stopped before its trailing edge passes through the printhead 7. As a detailed example, the discharging operation is performed until the trailing edge of the preceding sheet 1-A comes to a position spaced apart from the conveying nip portion to the downstream side by 5 mm in the sheet conveying direction.
Since the feeding roller 3 is not driven during this time, the succeeding sheet 1-B stops while keeping its leading edge at the position spaced apart from the conveying nip portion to the upstream side by the predetermined amount. In step S29, the leading edge of the succeeding sheet 1-B is abutted against the conveying nip portion, and the skew correction operation of the succeeding sheet 1-B is performed. In step S18, the succeeding sheet 1-B is aligned.
In step S19, the feeding motor 206 is switched to low-speed driving. In step S20, ink is discharged from the printhead 7 to the succeeding sheet 1-B, thereby starting the printing operation. More specifically, the conveying operation of intermittently conveying the succeeding sheet 1-B by the conveying roller 5 and the image forming operation (ink discharge operation) of moving the carriage 10 and discharging ink from the printhead 7 are repeated, thereby performing the printing operation for the succeeding sheet 1-B. The feeding motor 206 is intermittently driven at a low speed in synchronism with the operation of intermittently conveying the succeeding sheet 1-B by the conveying roller 5. That is, the pickup roller 2 and the feeding roller 3 intermittently rotate at 7.6 inches/sec.
In step S21, it is determined whether the print data of the next page exists. If the print data of the next page exists, the process returns to step S10. In a case in which the print data of the next page does not exist, if the image forming operation for the succeeding sheet 1-B ends in step S22, the discharging operation of the succeeding sheet 1-B is performed in step S23, and the printing operation ends in step S24.
An operation of forming the overlap state in which the leading edge portion of the succeeding sheet 1-B is overlaid on the trailing edge portion of the preceding sheet 1-A, which has been described concerning steps S12 and S13 of
The process of conveying the print sheet 1 by the conveying roller 5 and the feeding roller 3 will be described sequentially as three states. A first state in which an operation of making the succeeding sheet 1-B chase the preceding sheet 1-A will be described with reference to states ST11 and ST12 shown in
In the state ST11 of
In the first state, there exists a case in which the operation of making the succeeding sheet chase the preceding sheet is stopped in the first section A1. If the leading edge of the succeeding sheet 1-B passes the trailing edge of the preceding sheet 1-A before the position P1, as indicated by the state ST12 shown in
In the state ST13 of
In the second state, there exists a case in which the operation of overlaying the succeeding sheet on the preceding sheet is stopped in the second section A2. If the leading edge of the succeeding sheet 1-B cannot catch up with the trailing edge of the preceding sheet 1-A in the second section A2, as indicated by the state ST14 shown in
In the state ST15 of
In step S100, the processing starts. In step S101, it is determined whether the condition to set the execution timing of the skew correction operation for the succeeding sheet 1-B is met. In this example, it is determined whether the remaining print range is the last row or not. For example, if the preceding sheet 1-A is in a state during the period from the start of printing of the row immediately before the last row to the completion of conveyance of the preceding sheet 1-A to the print position of the last row, it is determined that the condition is met. If the condition is met, the process advances to step S102. If the condition is not met, the printing operation of the preceding sheet 1-A is continued.
The nozzle length or the distance between the conveying nip portion and the printhead 7 is known. Hence, the determination of step S101 may be done based on the position of the preceding sheet 1-A with respect to the conveying nip portion.
In steps S102 to S111, the execution timing of the skew correction operation for the succeeding sheet 1-B is set based on the positions of the preceding sheet 1-A and the succeeding sheet 1-B.
In step S102, it is determined whether the leading edge of the succeeding sheet 1-B has reached the determination position (the position P3 in the state ST15 shown in
If the leading edge of the succeeding sheet 1-B has not reached the determination position (NO in step S102), there is some question as to whether the leading edge of the succeeding sheet 1-B abuts against the conveying nip portion by the conveyance of a predetermined amount. For this reason, it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on, and the setting processing ends (step S104). In this case, for example, only the preceding sheet 1-A is conveyed until the trailing edge of the preceding sheet 1-A comes to a position spaced apart from the conveying nip portion to the downstream side by, for example, 5 mm in the sheet conveying direction, and then stopped. Next, only the succeeding sheet 1-B is abutted against the conveying nip portion, and the skew correction operation is performed. After that, conveyance of the succeeding sheet 1-B for alignment and conveyance of the preceding sheet 1-A by the same amount are simultaneously performed.
If the leading edge of the succeeding sheet 1-B has reached the determination position P3 (YES in step S102), it is determined whether the trailing edge of the preceding sheet 1-A has passed through the conveying nip portion (step S105). Upon determining that the trailing edge of the preceding sheet 1-A has passed through the conveying nip portion (YES in step S105), the preceding sheet 1-A and the succeeding sheet 1-B do not overlap. The printing operation of the last row of the preceding sheet 1-A is yet to be performed. Hence, the post-line-spacing conveying operation timing flag is turned on in step S106, and the setting processing ends.
Upon determining that the trailing edge of the preceding sheet 1-A has not passed through the conveying nip portion (NO in step S105), it is determined whether the overlap amount between the trailing edge portion of the preceding sheet 1-A and the leading edge portion of the succeeding sheet 1-B is smaller than a threshold (step S107). In the determination of step S107, it is determined whether the overlap amount when forming the image of the last row on the preceding sheet 1-A is smaller than the threshold or not. The threshold can be set to, for example, 9 mm.
Upon determining that the overlap amount is smaller than the threshold (YES in step S107), it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S108), and the setting processing ends. That is, after the image forming operation for the preceding sheet 1-A ends, the succeeding sheet 1-B is not conveyed together with the preceding sheet 1-A. More specifically, although the preceding sheet 1-A is conveyed by driving the conveying roller 5, the feeding roller 3 is not driven. Hence, the overlap state is canceled. In addition, only the succeeding sheet 1-B is abutted against the conveying nip portion, and the skew correction operation is performed. After that, conveyance of the succeeding sheet 1-B for alignment and conveyance of the preceding sheet 1-A by the same amount are simultaneously performed.
Upon determining that the overlap amount is equal to or larger than the threshold (NO in step S107), it is determined whether to execute overlap continuous feeding based on the position of the succeeding sheet 1-B when the printhead 7 starts printing on the succeeding sheet 1-B. Here, for example, the position of the succeeding sheet 1-B relative to the pressing spur 12 is used as the reference. That is, it is determined whether the succeeding sheet 1-B reaches the pressing spur 12 when aligning the succeeding sheet 1-B (when the printhead 7 starts printing on the succeeding sheet 1-B) (step S109). Note that the method of calculating the position of the succeeding sheet 1-B will be described later with reference to
Upon determining that the succeeding sheet 1-B does not reach the pressing spur 12 (NO in step S109), it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S110), and the setting processing ends. Overlap continuous feeding is not executed in consideration of floating of the succeeding sheet 1-B that may occur if the succeeding sheet 1-B has not reached the pressing spur 12. As a result, after the image forming operation for the preceding sheet 1-A ends, the succeeding sheet 1-B is not conveyed together with the preceding sheet 1-A. More specifically, the conveying roller 5 is driven by the conveying motor 205 to convey the preceding sheet 1-A until its trailing edge comes to a position spaced apart from the conveying nip portion to the downstream side (for example, a position spaced apart by 5 mm) in the sheet conveying direction. However, the feeding roller 3 is not driven. Hence, the overlap state is canceled. In addition, only the succeeding sheet 1-B is abutted against the conveying nip portion, and the skew correction operation is performed. After that, conveyance of the succeeding sheet 1-B for alignment and conveyance of the preceding sheet 1-A by the same amount are simultaneously performed.
Upon determining that the succeeding sheet 1-B reaches the pressing spur 12 (YES in step S109), the post-line-spacing conveying operation timing flag is turned on in step S111, and the setting processing ends. That is the succeeding sheet 1-B is abutted against the conveying nip portion in a state in which it overlaps the preceding sheet 1-A. More specifically, driving of the conveying motor 205 is not executed. Only the feeding motor 206 is driven to rotate only the feeding roller 3 in a state in which the conveying roller 5 stops, thereby performing the skew correction operation of the succeeding sheet 1-B. After the skew correction operation, the succeeding sheet 1-B is aligned in a state in which it overlaps the preceding sheet 1-A.
The execution timing of the skew correction operation of the succeeding sheet 1-B can thus be set.
An example of calculation of the position of the succeeding sheet 1-B will be described next with reference to
Next, first print data to be printed on the succeeding sheet 1-B is loaded (step S204). The first print data here means first print data that needs ink discharge. That is, a blank is not included. The position of the first print data from the leading edge of the sheet is thus specified. In other words, a non-printing region is specified. Hence, it is determined whether the distance from the leading edge of the succeeding sheet 1-B to the first print data is larger than the previously temporarily set length Q (step S205). If the distance is larger, the process advances to step S206. If the distance is not larger, the process advances to step S207. In step S206, the length Q is updated to the distance from the leading edge of the succeeding sheet 1-B to the first print data.
Next, a first carriage moving instruction is created (step S207). When the carriage moving instruction is created, a nozzle to be used to print the first print data is decided. In step S208, the length Q is updated as needed such that the position of the decided nozzle matches the print start position of the succeeding sheet 1-B, and the length Q is determined (step S208). The determined value of the length Q is saved in, for example, the RAM 203, and the processing ends (step S209).
Note that the step of calculating the leading edge position after the alignment of the succeeding sheet described here is step S9 of the flowchart of the overlap continuous feeding operation shown in
As described above, according to this embodiment, it is unnecessary to determine whether to execute overlap continuous feeding at the start time of feeding of the succeeding sheet 1-B. This is advantageous because, for example, even if the margin amount of the succeeding sheet 1-B is unknown at the start time of feeding of the succeeding sheet 1-B, overlap continuous feeding can be executed when the margin amount is confirmed later. In this case, whether to execute overlap continuous feeding is determined later. For example, the determination is done immediately before the conveyance of the succeeding sheet 1-B by the conveying roller 5. However, since the timing of skew correction is switched in accordance with the determination result, a conveyance error can be avoided.
According to the embodiment, synchronous/asynchronous driving of the feeding motor 206 and the conveying motor 205 when the printhead 7 performs the printing operation on the preceding sheet 1-A is switched. More specifically, before the sheet detection sensor 16 detects the leading edge of the succeeding sheet 1-B, the feeding motor 206 is driven in synchronism with the conveying motor 205. On the other hand, after the leading edge of the succeeding sheet is detected by the sheet detection sensor 16, the feeding motor 206 is continuously driven. By the continuous driving, the chasing operation for overlaying the succeeding sheet 1-B on the preceding sheet 1-A can be performed, and the overlap amount between the preceding and succeeding print sheets 1 in overlap continuous feeding can be adjusted. The overlap amount is set by referring to the print data of the preceding sheet 1-A and the print data of the succeeding sheet 1-B.
Note that in this embodiment, in the stage of feeding, the preceding sheet 1-A and the succeeding sheet 1-B are fed at an interval. However, an arrangement that conveys them in an overlap state from the stage of feeding can also be employed.
In this embodiment, at the time of overlap continuous feeding, the sheets are assumed to overlap such that the succeeding sheet 1-B is located on the side of the printhead 7 with respect to the preceding sheet 1-A. However, the positions may be replaced. That is, the sheets may overlap such that the preceding sheet 1-A is located on the side of the printhead 7 with respect to the succeeding sheet 1-B.
In the first embodiment, an example in which it is determined in step S101 of
In step S301, the processing starts. In step S302, it is determined whether the condition to set the execution timing of the skew correction operation for the succeeding sheet 1-B is met. In this example, it is determined whether the remaining print range includes two rows. For example, if the preceding sheet 1-A is in a state during the period from the start of printing of the second row from the last row to the completion of conveyance of the preceding sheet 1-A to the print position immediately before the last row, it is determined that the condition is met. If the condition is met, the process advances to step S303. If the condition is not met, the printing operation of the preceding sheet 1-A is continued.
The nozzle length or the distance between the conveying nip portion and the printhead 7 is known. Hence, the determination of step S302 may be done based on the position of the preceding sheet 1-A with respect to the conveying nip portion. For example, assume that when the print position of the last row of the preceding sheet 1-A reaches the conveying nip portion, the remaining print range includes two rows. In this case, the determination of step S302 is done by determining whether the print position of the last row of the preceding sheet 1-A (in other words, a position corresponding to the trailing edge portion of the image printed on the last row) has reached the conveying nip portion or not. In this way, whether the preceding sheet 1-A has reached a predetermined position may be determined based on whether a specific print position on the preceding sheet 1-A has reached the conveying nip portion. Position determination of the preceding sheet 1-A may be facilitated by using the conveying nip portion as a reference.
In steps S303 to S312, the execution timing of the skew correction operation for the succeeding sheet 1-B is set based on the positions of the preceding sheet 1-A and the succeeding sheet 1-B.
In step S303, it is determined whether the leading edge of the succeeding sheet 1-B has reached a determination position (a position P3 in a state ST15 shown in
If the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S304), there is some question as to whether the leading edge of the succeeding sheet 1-B abuts against the conveying nip portion by the conveyance of a predetermined amount. For this reason, it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S305), and the setting processing ends (step S306). In this case, for example, only the preceding sheet 1-A is conveyed until the trailing edge of the preceding sheet 1-A comes to a position spaced apart from the conveying nip portion to the downstream side by, for example, 5 mm in the sheet conveying direction, and then stopped. Next, only the succeeding sheet 1-B is abutted against the conveying nip portion, and the skew correction operation is performed. After that, conveyance of the succeeding sheet 1-B for alignment and conveyance of the preceding sheet 1-A by the same amount are simultaneously performed.
If the leading edge of the succeeding sheet 1-B has reached the determination position (P3 in the state ST15 in
Upon determining that the trailing edge of the preceding sheet 1-A has not passed through the conveying nip portion (NO in step S307), it is determined whether the overlap amount between the trailing edge portion of the preceding sheet 1-A and the leading edge portion of the succeeding sheet 1-B is smaller than a threshold (step S309). Upon determining that the overlap amount is equal to or larger than the threshold (NO in step S309), the post-line-spacing conveying operation timing flag is turned on, and the setting processing ends. The skew correction operation of the succeeding sheet 1-B is performed during image formation of the row immediately before the last row or during image formation of the last row.
Upon determining that the overlap amount is smaller than the threshold (YES in step S309), it is determined whether the printing operation of the preceding sheet 1-A is performed for the last row (step S311). Upon determining that the printing operation of the preceding sheet 1-A is not performed for the last row (NO in step S311), the printing operation of the preceding sheet 1-A is continued, and the process returns to step S307.
If the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S311), it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S312), and the setting processing ends (step S306).
As described above, according to this embodiment, the skew correction operation of the succeeding sheet 1-B can be executed from the row immediately before the last row to the last row of the preceding sheet 1-A, and the printing speed can be improved as compared to the first embodiment.
If two print sheets 1 are conveyed by a conveying roller 5 in an overlap state by overlap continuous feeding, slipping may occur depending on the type of the print sheet 1, and a conveyance error may occur as compared to a case in which only one print sheet is conveyed. In this embodiment, an example in which an influence on image formation after the overlap portion between a preceding sheet 1-A and a succeeding sheet 1-B starts passing through a conveying nip portion is reduced will be described.
In this embodiment, an example in which an influence on image formation on the succeeding sheet 1-B will be described. Here, not only setting of the execution timing of the skew correction operation of the succeeding sheet 1-B, but also a print mode within the range of a predetermined length from the leading edge of the succeeding sheet 1-B is taken into consideration. An example, in which considering the arrangement mode of print scan as the print mode, the conveyance amount and nozzles to be used in the printing operation of the succeeding sheet 1-B can be changed, will be described.
In step S401, the processing starts. In step S402, it is determined whether the condition to set the execution timing of the skew correction operation for the succeeding sheet 1-B is met. In this example, it is determined whether the remaining print range includes two rows. If the condition is met, the process advances to step S403. If the condition is not met, the printing operation of the preceding sheet 1-A is continued.
In steps S403 to S418, the execution timing of the skew correction operation for the succeeding sheet 1-B is set based on the positions of the preceding sheet 1-A and the succeeding sheet 1-B and the print mode for the succeeding sheet 1-B.
In step S403, it is determined whether the leading edge of the succeeding sheet 1-B has reached a determination position (a position P3 in a state ST15 shown in
If the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S404), there is some question as to whether the leading edge of the succeeding sheet 1-B abuts against the conveying nip portion by the conveyance of a predetermined amount. For this reason, it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S405), and the setting processing ends (step S406).
If the leading edge of the succeeding sheet 1-B has reached the determination position (P3 in the state ST15 in
Upon determining that the trailing edge of the preceding sheet 1-A has not passed through the conveying nip portion (NO in step S407), it is determined whether the overlap amount between the trailing edge portion of the preceding sheet 1-A and the leading edge portion of the succeeding sheet 1-B is smaller than a threshold (step S409).
Upon determining that the overlap amount is smaller than the threshold (YES in step S409), it is determined whether the printing operation of the preceding sheet 1-A is performed for the last row (step S410). Upon determining that the printing operation of the preceding sheet 1-A is not performed for the last row (NO in step S410), the printing operation of the preceding sheet 1-A is continued, and the process returns to step S407. Upon determining that the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S410), it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S411), and the setting processing ends (step S406).
Upon determining that the overlap amount is equal to or larger than the threshold (NO in step S409), a distance L from the conveying roller 5 (conveying nip portion) to the trailing edge of the preceding sheet 1-A is calculated in step S412.
If overlap continuous feeding is performed by making the preceding sheet 1-A and the succeeding sheet 1-B overlap by the length corresponding to the distance L, the range of the length corresponding to the distance L from the leading edge of the succeeding sheet 1-B in the conveying direction can be influenced by a conveyance error caused by the overlap continuous feeding. The conveyance error influences image quality depending on the print mode in this range. In particular, the conveyance error readily has an influence depending on the arrangement mode of print scan during the conveyance of the succeeding sheet 1-B. For example, in an arrangement mode in which print scan processes adjacent in the conveying direction continue, if a conveyance error occurs, a black stripe or a white stripe may appear at the joint between the adjacent print scan processes. This will be described in more detail with reference to
In
The succeeding sheet 1-B is conveyed by a distance H1 between the second scan and the third scan. The distance H1 corresponds to the nozzle length of a printhead 7. The conveyance error becomes worse in proportion to the conveyance amount of the preceding and succeeding sheets passing through the conveying nip portion in the overlap state. Conversely, if the conveyance amount of the preceding and succeeding sheets passing through the conveying nip portion in the overlap state is small, the conveyance error can be reduced.
Hence, if the use range of nozzles used in the third scan in the conveying direction is small, as shown in
The example shown in
In addition, the conveyance amount of the succeeding sheet 1-B is changed from H1 to H2 (=0.5×H1) between the second scan and the third scan. Since the conveyance amount changes to ½, the conveyance error also changes to about ½, and generation of a black stripe or white stripe can be reduced.
In this embodiment, the use range of the nozzles is compared with a threshold. If the use range exceeds the threshold (also called a nozzle threshold), the assignment of the nozzles to be used is changed, and the conveyance amount of the succeeding sheet 1-B is changed. The nozzle threshold can appropriately be set in accordance with the nozzle length of the printhead 7 or the conveyance amount that causes image quality degradation when the preceding and succeeding sheets are passed through the conveying nip portion in the overlap state. For example, if a black stripe or white stripe is generated by conveying the sheets by a distance of 0.7×H1 relative to the nozzle length H1 of the printhead 7, the nozzle threshold is set such that the conveyance amount is suppressed to be smaller than 0.7×H1. In this case, whether the nozzle use range is 70% or more from the upstream side is set to the nozzle threshold. If the use range is less than 70%, the assignment of the nozzles to be used or the conveyance amount is changed. If the use range is 70% or more, overlap continuous feeding is not performed.
Referring back to
In step S414, the post-line-spacing conveying operation timing flag is turned on, and the setting processing ends. The skew correction operation of the succeeding sheet 1-B is performed during image formation of the row immediately before the last row or during image formation of the last row.
In step S415, it is determined whether the use range of the nozzles in the joint is equal to or more than the nozzle threshold. If the use range is less than the nozzle threshold, the process advances to step S416. If the use range is equal to or more than the nozzle threshold, the process advances to step S417. In step S416, the assignment of the nozzles to be used in the joint is changed, and the conveyance amount of the succeeding sheet 1-B up to the print scan of the joint is changed. After that, the process advances to step S414. The post-line-spacing conveying operation timing flag is turned on, and the setting processing ends. That is, although the joint exists on the succeeding sheet 1-B, generation of a black stripe or white stripe can be prevented by changing the conveyance amount of the succeeding sheet 1-B up to the print scan of the joint, and therefore, overlap continuous feeding is executed.
In step S417, it is determined whether the printing operation of the preceding sheet 1-A is performed for the last row. Upon determining that the printing operation of the preceding sheet 1-A is not performed for the last row (NO in step S417), the printing operation of the preceding sheet 1-A is continued, and the process returns to step S407. Upon determining that the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S417), it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S418), and the setting processing ends.
As described above, according to the third embodiment, it is possible to perform the skew correction operation of the succeeding sheet 1-B during the printing operation of the preceding sheet 1-A while reducing lowering of conveyance accuracy of the succeeding sheet 1-B. In addition, the print sheets can be conveyed in an overlap state during the printing operation. As a result, the print speed can be improved while maintaining image quality.
In the third embodiment, a form in which the existence of a joint in the print contents of the succeeding sheet 1-B or the nozzles to be used in the joint are determined, thereby reducing lowering of the conveyance accuracy of the succeeding sheet 1-B has been described. In the fourth embodiment, the concept of the third embodiment is applied to printing of a preceding sheet 1-A.
In step S501, the processing starts. In step S502, it is determined whether the condition to set the execution timing of the skew correction operation for a succeeding sheet 1-B is met. In this example, it is determined whether the remaining print range includes two rows. If the condition is met, the process advances to step S503. If the condition is not met, the printing operation of the preceding sheet 1-A is continued.
In steps S503 to S517, the execution timing of the skew correction operation for the succeeding sheet 1-B is set based on the positions of the preceding sheet 1-A and the succeeding sheet 1-B and the print mode for the succeeding sheet 1-B.
In step S503, it is determined whether the leading edge of the succeeding sheet 1-B has reached a determination position (a position P3 in a state ST15 shown in
If the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S504), there is some question as to whether the leading edge of the succeeding sheet 1-B abuts against the conveying nip portion by the conveyance of a predetermined amount. For this reason, it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S505), and the setting processing ends (step S506).
If the leading edge of the succeeding sheet 1-B has reached the determination position (P3 in the state ST15 in
Upon determining that the trailing edge of the preceding sheet 1-A has not passed through the conveying nip portion (NO in step S507), it is determined whether the overlap amount between the trailing edge portion of the preceding sheet 1-A and the leading edge portion of the succeeding sheet 1-B is smaller than a threshold (step S509).
Upon determining that the overlap amount is smaller than the threshold (YES in step S509), it is determined whether the printing operation of the preceding sheet 1-A is performed for the last row (step S510). Upon determining that the printing operation of the preceding sheet 1-A is not performed for the last row (NO in step S510), the printing operation of the preceding sheet 1-A is continued, and the process returns to step S507. Upon determining that the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S510), it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S511), and the setting processing ends (step S506).
Upon determining that the overlap amount is equal to or larger than the threshold (NO in step S509), it is determined based on the print data of the preceding sheet 1-A whether a joint exemplified in
In step S513, the post-line-spacing conveying operation timing flag is turned on, and the setting processing ends. The skew correction operation of the succeeding sheet 1-B is performed during image formation of the row immediately before the last row or during image formation of the last row.
In step S514, it is determined whether the use range of the nozzles in the joint is equal to or more than a nozzle threshold. If the use range is less than the nozzle threshold, the process advances to step S515. If the use range is equal to or more than the nozzle threshold, the process advances to step S516. In step S515, the assignment of the nozzles to be used in the joint is changed, and the conveyance amount of the preceding sheet 1-A up to the print scan of the joint is changed. After that, the process advances to step S513. The post-line-spacing conveying operation timing flag is turned on, and the setting processing ends. That is, although the joint exists on the preceding sheet 1-A, generation of a black stripe or white stripe can be prevented by changing the conveyance amount of the preceding sheet 1-A up to the print scan of the joint, and therefore, overlap continuous feeding is executed. The changed contents in step S515 are reflected on the printing operation during the period when the preceding sheet 1-A and the succeeding sheet 1-B pass through the conveying nip portion in a state in which the trailing edge portion of the preceding sheet 1-A and the leading edge portion of the succeeding sheet 1-B overlap.
In step S516, it is determined whether the printing operation of the preceding sheet 1-A is performed for the last row. Upon determining that the printing operation of the preceding sheet 1-A is not performed for the last row (NO in step S516), the printing operation of the preceding sheet 1-A is continued, and the process returns to step S507. Upon determining that the printing operation of the preceding sheet 1-A is performed for the last row (YES in step S516), it is determined not to execute overlap continuous feeding, the post-discharging operation timing flag is turned on (step S517), and the setting processing ends.
As described above, according to the fourth embodiment, it is possible to perform the skew correction operation of the succeeding sheet 1-B during the printing operation of the preceding sheet 1-A while reducing lowering of conveyance accuracy of the preceding sheet 1-A. In addition, the print sheets can be conveyed in an overlap state during the printing operation. As a result, the print speed can be improved while maintaining image quality.
The third embodiment and the fourth embodiment may be combined. That is, the presence/absence of a joint in the print range or nozzles to be used in the joint may be determined for both a preceding sheet 1-A and a succeeding sheet 1-B, and the nozzles to be used and the conveyance amount of each print sheet 1 may be changed.
The setting of the execution timing of the skew correction operation of the succeeding sheet 1-B according to each embodiment may be done based on the type of the succeeding sheet 1-B. For example, processing concerning the nozzle change or conveyance amount change described in the third or fourth embodiment may be performed or prohibited depending on the type of the print sheet 1. High-quality special paper or paper used for a pamphlet or the like is thicker than plain paper. Hence, the conveyance amount difference between conveyance of one paper sheet and conveyance of two paper sheets in a nipped state is large. If conveyance is performed using the same conveyance amount, image quality may be degraded by a black stripe or white stripe. For this reason, the type of the print sheet 1 may be determined based on driver information or user setting and the processing may be switched.
Embodiment(s) of the present invention can also be realized by a computer of a system or apparatus that reads out and executes computer executable instructions (e.g., one or more programs) recorded on a storage medium (which may also be referred to more fully as a ‘non-transitory computer-readable storage medium’) to perform the functions of one or more of the above-described embodiment(s) and/or that includes one or more circuits (e.g., application specific integrated circuit (ASIC)) for performing the functions of one or more of the above-described embodiment(s), and by a method performed by the computer of the system or apparatus by, for example, reading out and executing the computer executable instructions from the storage medium to perform the functions of one or more of the above-described embodiment(s) and/or controlling the one or more circuits to perform the functions of one or more of the above-described embodiment(s). The computer may comprise one or more processors (e.g., central processing unit (CPU), micro processing unit (MPU)) and may include a network of separate computers or separate processors to read out and execute the computer executable instructions. The computer executable instructions may be provided to the computer, for example, from a network or the storage medium. The storage medium may include, for example, one or more of a hard disk, a random-access memory (RAM), a read only memory (ROM), a storage of distributed computing systems, an optical disk (such as a compact disc (CD), digital versatile disc (DVD), or Blu-ray Disc (BD)™), a flash memory device, a memory card, and the like.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
This application claims the benefits of Japanese Patent Application No. 2016-102760, filed May 23, 2016, which is hereby incorporated by reference herein in its entirety.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-102760 | May 2016 | JP | national |
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| 9597900 | Tanaami et al. | Mar 2017 | B2 |
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| Number | Date | Country |
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| 2004-361540 | Dec 2004 | JP |
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| 2016-013617 | Jan 2016 | JP |
| Entry |
|---|
| Office Action dated Mar. 16, 2020, in Japanese Patent Application No. 2016-102760. |
| Number | Date | Country | |
|---|---|---|---|
| 20200147981 A1 | May 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15591322 | May 2017 | US |
| Child | 16742451 | US |
