JP2008238795A - Recorder, control method of recorder and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect a paper abnormality (paper conveyance abnormality) such as paper jamming or paper skewing by a simple constitution. <P>SOLUTION: In the recorder which drives in a main scan direction a recording head and a carriage that carries an optical paper width detection sensor to detect a scan width in the main scan direction of the recording head, the carriage is scanned, and one end position of a recording paper in the main scan direction is detected by the optical paper width detection sensor. A distance between the end position and a paper reference position preliminarily set outside a conveyance region of the recording paper is calculated. When a difference ΔP between distances P<SB>REF</SB>and P<SB>EDG</SB>at two scan positions among a plurality of the number of times of scan of the carriage performed on the same paper becomes not smaller than a predetermined reference difference, it is judged as the paper abnormality. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a recording apparatus provided with an optical paper width detection sensor for detecting a scanning width of a recording head in the main scanning direction, a control method for the recording apparatus, and a control program. Regarding technology.

2. Description of the Related Art Conventionally, in recording apparatuses such as various printers, an optical paper width detection sensor is provided to detect the width in the main scanning direction of a recording head mounted on a carriage when recording an image including characters on recording paper. (For example, refer to Patent Document 1).
Further, in this type of printer, a detection roller for detecting a jam of the recording sheet is rotatably provided on the same axis as the axis of the sheet conveying roller disposed before and after the recording head.
When the detection roller rotates in synchronization with the recording paper conveyance speed, it is determined that the detection roller is operating normally. When the detection roller is stopped, the recording paper is jammed. I was making a decision.
JP-A-6-293163

In the above-described conventional configuration, it is possible to detect that the recording sheet has stopped due to jamming, but it has not been possible to detect a sheet conveyance abnormality such as a skew (axial deviation) of the recording sheet.
As a result, when a paper conveyance abnormality occurs, for example, there is a problem that printing is continued while the recording paper is in a curved state, and correct printing cannot be performed.
Accordingly, an object of the present invention is to provide a recording apparatus, a recording apparatus control method, and a control program capable of reliably detecting a sheet abnormality (sheet conveyance abnormality) such as sheet jamming and sheet skew with a simple configuration. It is in.

  In order to solve the above problems, in a recording apparatus for driving a recording head and a carriage mounted with an optical paper width detection sensor in the main scanning direction to detect the scanning width of the recording head in the main scanning direction, a recording paper transport area An end position detection unit that sets a sheet reference position outside, scans the carriage, and detects one end position of the recording sheet in the main scanning direction by the optical sheet width detection sensor; and the end position A distance calculation unit that calculates a distance between the sheet and the paper reference position, and a difference between the distances at two scanning positions among a plurality of times of scanning of the carriage performed on the same paper is a predetermined reference difference. A sheet abnormality detection unit that detects a sheet abnormality in the case described above is provided.

According to the above configuration, the end position detection unit scans the carriage, and detects one end position of the recording paper in the main scanning direction by the optical paper width detection sensor.
The distance calculation unit calculates the distance between the edge position and the paper reference position.
As a result, the sheet abnormality detection unit detects a sheet abnormality when the difference in distance between the two scanning positions is equal to or greater than a predetermined reference difference among a plurality of carriage scans performed on the same sheet. To do.
Therefore, since the paper abnormality is detected by the optical paper width detection sensor for detecting the paper width, the paper width detection and the paper abnormality detection can be executed by one sensor, and the cost can be reduced by reducing the number of parts.

In this case, the sheet abnormality detection unit detects the end position of the recording sheet at any one of the scanning positions of the carriage performed on the same sheet, and detects the sheet abnormality. The edge position of the recording paper at another arbitrary scanning position as a reference position is a paper abnormality determination position, the distance between the paper abnormality detection reference position and the paper reference position, and the paper When the difference between the abnormality determination position and the distance between the paper reference position is equal to or larger than a predetermined reference difference, it may be detected that the paper is abnormal.
According to the above configuration, when the distance difference is greater than or equal to the predetermined reference difference due to the skew of the recording paper, that is, when the recording paper is greatly inclined, it is possible to reliably detect the paper abnormality. .

The paper abnormality detection reference position may be an end position of the recording paper at a scanning position when the paper width of the paper is detected.
According to the above configuration, the paper width can be detected and the paper abnormality detection reference position can be set in one scan, so that the throughput can be improved.
The paper reference position may be a home position position.
According to the above configuration, a special process is not required for setting the paper reference position, so that the process is simplified.

Further, in a control method of a recording apparatus for driving a carriage mounted with an optical paper width detection sensor in the main scanning direction to detect a recording head and a scanning width of the recording head in the main scanning direction, the carriage is scanned, An end position detecting process for detecting one end position of the recording paper in the main scanning direction by an optical paper width detection sensor; and the end position and a paper reference position set in advance outside a recording paper transport area; When the distance calculation process of calculating the distance between the two and the scanning of the carriage performed on the same sheet of the plurality of times the difference in the distances at two scanning positions is equal to or greater than a predetermined reference difference And a paper abnormality detection process for detecting a paper abnormality.
Accordingly, since the paper abnormality is detected by the optical paper width detection sensor for detecting the paper width, the paper width detection and the paper abnormality detection can be executed by one sensor, and the processing can be simplified.

Further, in a control program for controlling, by a computer, a recording apparatus that drives a recording head and a carriage mounted with an optical paper width detection sensor in the main scanning direction to detect a scanning width of the recording head in the main scanning direction. The carriage is scanned, the one end position of the recording sheet in the main scanning direction is detected by the optical sheet width detection sensor, and the end position and a sheet reference position set in advance outside the recording sheet conveyance area When the difference between the distances at two scanning positions among a plurality of scans of the carriage performed on the same sheet is equal to or greater than a predetermined reference difference, the sheet is calculated. It is characterized by being detected as abnormal.
Accordingly, since the paper abnormality is detected by the optical paper width detection sensor for detecting the paper width, the paper width detection and the paper abnormality detection can be executed by one sensor, and the processing can be simplified.

  According to the present invention, since the paper abnormality is detected by the optical paper width detection sensor for detecting the paper width, the paper width detection and the paper abnormality detection can be surely executed by one sensor, and the processing procedure is simplified and the cost is reduced by reducing the number of parts. I can plan down.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an external appearance of a front of a printer according to an embodiment of a recording apparatus of the present invention.
FIG. 2 is a sectional side view of the printer.
FIG. 3 is a perspective view showing a frame configuration with the ink ribbon cartridge removed.
FIG. 4 is a perspective view showing the frame configuration of FIG. 3 as viewed from the tractor unit side.
The printer 10 includes a recording head 20 that selectively ejects a plurality of recording wires, and a carriage 21 on which the recording head 20 is mounted. The recording wire ejected from the recording head 20 is a recording medium (hereinafter referred to as a sheet). .) Is a serial dot impact printer that records an image including characters by hitting it.
As shown in FIG. 2, this printer 10 is roughly divided into a printer main body 12, which constitutes a recording unit, a tractor unit 13, and a sheet guide 14. These upper and lower parts are as shown in FIG. Further, the upper case 15 and the lower case 16 are covered. The sheet includes a cut sheet cut to a predetermined length and a continuous sheet in which a plurality of sheets are connected. Examples of the cut sheet include a cut sheet, a copy paper, a passbook, and a cut film, and the continuous sheet includes a continuous sheet.
The printer main body 12 includes an MPU, a ROM that stores various control programs such as a sheet abnormality detection process to be described later, a RAM that temporarily stores data, a controller (not shown) configured as a microcomputer, a recording mechanism unit, and the like. And.
The recording mechanism unit includes a recording head 20, a carriage 21 and a platen 22, and a plurality of conveying rollers 23 as a sheet conveying mechanism unit. More specifically, as shown in FIGS. 3 and 4, the printer main body 12 includes a back frame 27, a platen 22, a carriage shaft 28, a plurality of roller shafts 23 a, and a tractor unit 13 between a pair of side frames 25 and 26. The carriage shaft 28 is provided with a carriage 21, and each roller shaft 23 a is provided with a conveyance roller 23.

  The conveyance rollers 23 are arranged in pairs in the vertical direction in front of and behind the printer main body 12 with respect to the platen 22 (some conveyance rollers 23 are not shown), and a sheet conveyance motor (not shown) and the motor The drive wheel train 41, which is connected and arranged outside the right side frame 26, is driven to rotate clockwise or counterclockwise in FIG. As a result, the sheet can be conveyed from the front (sheet guide 14 side) to the rear of the printer main body 12 and from the rear to the front of the printer main body 12. The sheet is orthogonal to the main scanning direction of the carriage 21. Is conveyed in the sub-scanning direction.

The carriage 21 is slidably inserted into the carriage shaft 28 and mounted on a timing belt 48 (see FIG. 3) mounted with a recording head 20 and driven by a carriage drive motor constituted by a stepping motor (not shown). Combined.
As a result, the carriage 21 is guided to the carriage shaft 28 via the timing belt 48 by the forward or reverse rotation of the carriage drive motor, and coincides with the axial direction of the carriage shaft 28 and the longitudinal direction of the platen 22. (Scanned). The recording head 20 includes a large number of recording wires (not shown), and drives these recording wires toward the platen 22.

As shown in FIG. 5, a stationery type ink ribbon cartridge 29 is detachably mounted on the printer main body 12, and the ink ribbon of the ink ribbon cartridge 29 is fed between the recording head 20 and the platen 22.
As a result, while the recording head 20 is traveling in the main scanning direction together with the carriage 21, these recording wires are projected and applied to the ink ribbon, and the ink on the ink ribbon is placed between the platen 22 and the recording head 20. An image containing characters is recorded on the sheet conveyed to the sheet. As shown in FIG. 3, a ribbon mask holder 51 is installed on the carriage 21, and the ribbon mask holder 51 is conveyed from the ink ribbon in the ink ribbon cartridge 29 in contact with the upper surface of the platen 22 ( The cut sheet or continuous sheet) is protected.

The tractor unit 13 supplies a continuous sheet to the sheet conveying mechanism, and includes a pair of left and right tractors 30 as shown in FIG.
As shown in FIG. 2, each tractor 30 includes a tractor drive pulley 30a, a tractor driven pulley 30b, and a tractor belt 31 wound around these pulleys 30a and 30b, and a tractor drive pulley by a drive mechanism (not shown). 30a is rotated and the tractor belt 31 is driven to convey the continuous sheet.
In the recording operation by the recording head 20, while the recording head 20 is moved in the main scanning direction by the carriage 21, recording for one line is performed by ejecting a recording wire from the recording head 20, and recording for this one line is performed. Each time, the conveyance roller 23 (and the tractor unit 13) as the sheet conveyance mechanism unit conveys the continuous sheet for a predetermined length, and these operations are repeated.

FIG. 6 is a perspective view showing the carriage 21, and FIG. 7 is a perspective view showing the ribbon mask holder 51 attached to the carriage 21.
The carriage 21 is integrally formed with a boss portion 19a through which the carriage shaft 28 is slidably inserted. The carriage 21 is guided by the carriage shaft 28 so as to move in the axial direction of the carriage shaft 28 (main scanning). Direction).
As described above, the ribbon mask holder 51 is installed in the carriage 21, and the ink ribbon in the ink ribbon cartridge 29 is fed between the ribbon mask holder 51 and the guide pins 52.

In the present embodiment, as shown in FIGS. 6 and 7, a paper width detection sensor 43 is provided at the right end in the figure of the main body 51a of the ribbon mask holder 51 so that the paper width of the recording paper (cut sheet) can be detected optically. Has been placed.
The paper width detection sensor 43 is a reflective optical sensor, and includes a light emitting unit and a light receiving unit (not shown), and the light emitting unit and the light receiving unit are located on the back side of the platen 22 as shown in FIG. While facing the 45 flat surface 45a, the reflected light from the flat surface 45a can be detected while the carriage 21 is scanned in the main scanning direction.
In the paper width detection sequence, when a paper is passed on the paper guide 45, if the paper width detection sensor 43 moves on the paper, strong reflected light from the paper is received and the presence of the paper is detected. In addition, when the paper is not passed on the paper guide 45, if the paper width detection sensor 43 moves on the paper guide 45, it receives reflected light from the flat surface 45a that is far away from the paper guide 45, and thus weak reflection from the flat surface 45a. Light is received and paper out is detected.

Further, as shown in FIG. 5, a flat surface 45a of the paper guide 45 is provided by punching in the home position HP, which is the standby position of the recording head 20, outside the paper transport area in the printer 10. The opening (hole) 47 thus formed is formed.
As shown in FIG. 8, the opening 47 has a hexagonal hole shape. When the carriage 21 scans from the center of the printer toward the right side frame 26 along the main scanning direction, the main opening is sequentially performed from the front. One edge 47a and the other edge 47b extending in the sub-scanning direction orthogonal to the scanning direction are provided.
In the home position detection sequence, when the paper width detection sensor 43 scans the flat surface 45a of the paper guide 45 as the carriage 21 moves, the reflected light from the flat surface 45a is received. Therefore, weakly reflected light from the flat surface 45a, which is substantially equal to the above-described state of no paper, is received during scanning.
On the other hand, when the carriage 21 moves to the home position, which is the standby position of the recording head 20, as shown in FIG. 9, the paper width detection sensor 43 detects the opening 47, and further than the reflected light from the flat surface 45a. The home position is detected in response to the weak reflected light, and the drive of the carriage 21 is stopped after the detection.

  In the present embodiment, since the optical paper width detection sensor 43 detects the paper width of the cut sheet that has been passed through the cut sheet conveyance area and also detects the home position HP of the recording head 11, one paper width detection is performed. Paper width detection and home position detection can be executed by the sensor 43, and the cost can be reduced by reducing the number of parts. Further, since the detected portion can be easily formed simply by providing the opening 47 in the paper guide 45, the structure is simplified, the unnecessary detected portion becomes unnecessary, and the number of parts can be further reduced.

FIG. 10 is a diagram for explaining paper width detection and no-paper detection.
In this case, the reflectance is
Paper> Flat surface 45a >> Opening 47
Therefore, the reflected light level received by the paper width detection sensor 43 is RP as the reflected light level of the paper, RF as the reflected light level of the flat surface 45a, and RH as the reflected light level of the opening 47. Then, as shown in FIG.
RP >> RF >> RH
It has become.
As described above, the carriage 21 is guided by the carriage shaft 28 and travels between the left and right side frames 25 and 26 in the main scanning direction.
In the paper width detection sequence, as shown in FIG. 10, when the carriage 21 scans the flat surface 45a from left to right, for example, the paper width detection sensor 43 detects the light reception level RF from the flat surface 45a outside the paper transport area. The reflected light is received.

Further, when a cut sheet is passed on the paper guide 45, if the paper width detection sensor 43 moves on the cut sheet, the paper width detection sensor 43 reflects the reflected light of the light reception level RP (> RF) from the cut sheet. Light is received, and the cut sheet can be detected.
In addition, when the reflected light level transitions from the received light level RF to the received light level RP, or when the reflected light level transitions from the received light level RP to the received light level RF, the edge (edge) of the cut sheet is detected. It becomes. More specifically, in the case of FIG. 10, when the reflected light level transitions from the received light level RF to the received light level RP, the left edge (edge) of the cut sheet is detected, and the reflected light level is received. When transitioning from the level RP to the light reception level RF, the right edge (end) of the cut sheet is detected.
Therefore, the position between the position where the reflected light level transitions from the light reception level RF to the light reception level RP and the position where the reflected light level transitions from the light reception level RP to the light reception level RF is detected as the sheet width.

  Further, when there is no sheet passing through the sheet guide 45, the light receiving level of the sheet width detection sensor 43 is always the light receiving level RF in the sheet conveying area, as indicated by a one-dot chain line in FIG. Will be detected.

FIG. 11 is a diagram for explaining home position detection.
In the home position detection sequence, the cut sheet does not enter the paper conveyance area. Therefore, as shown in FIG. 11, the reflected light level of the paper width detection sensor 43 is until the paper width detection sensor 43 reaches the opening 47. The light reception level RF is always set.
FIG. 12 is a process flowchart of the home position detection process.
When the paper width detection sensor 43 moves to the vicinity of the home position as the carriage moves, home position detection is executed according to the procedure shown in FIG.

  That is, when the home position detection sequence is started, it is determined whether or not the edge 47a of the hole of the opening 47 is not detected by the paper width detection sensor 43 (step S1). Specifically, it is determined whether or not the light reception level of the paper width detection sensor 43 has changed from the light reception level RF to the light reception level RH.

In step S1, if the hole edge 47a is not detected (step S1; Yes), the carriage 21 is on the printer center side (paper conveyance area side), so one edge 47a ( The carriage 21 is moved toward the right side frame 26 until it is detected (see step S2).
When the movement reaches the edge 47a, the light reception level of the paper width detection sensor 43 changes from the light reception level RF to the light reception level RH.
Next, it is determined whether or not the other edge 47b (see FIG. 8) has been detected by the paper width detection sensor 43 after removing one edge 47a (step S3). Specifically, it is determined whether or not the light reception level of the paper width detection sensor 43 has changed from the light reception level RH to the light reception level RF.
In step S3, when the other edge 47b is detected (step S3; Yes), the carriage 21 has reached the home position, so the carriage is moved to the carriage standby position, and the home position detection sequence is terminated (step S3). S4).
That is, the position where the edge 47b is detected is the home position.
In step S3, if the other edge 47b cannot be detected, an error process is performed (step S5), and the process ends.

If the hole edge 47a (or edge 47b) is detected in the determination in step S1 (step S1; No), the hole width 47a (or edge 47b) is not detected, that is, the paper width is detected. The carriage 21 is moved to the left side frame side until the detection position of the sensor 43 deviates from the opening 47 (step S6).
Next, it is determined whether or not the hole edge 47a (or edge 47b) is no longer detected (step S7). That is, it is determined whether or not the detection position of the paper width detection sensor 43 deviates from the opening 47 and becomes a flat surface 45a, and the light reception level of the paper width detection sensor 43 becomes the light reception level RF.
If it is determined in step S7 that the flat surface 45a cannot be detected (step S7; No), an error process is performed (step S8), and the process ends.
In the determination of step S7, when the flat surface 45a can be detected and the detection position of the paper width detection sensor 43 deviates from the opening 47 (step S7; Yes), one edge 47a of the opening 47 (see FIG. 8). The carriage 21 is moved toward the right side frame 26 until it is detected (step S9).

When the movement reaches the edge 47a, the light reception level of the paper width detection sensor 43 changes from the light reception level RF to the light reception level RH.
Next, it is determined whether or not the other edge 47b (see FIG. 8) has been detected by the paper width detection sensor 43 after the removal of one edge 47a (step S10). Specifically, it is determined whether or not the light reception level of the paper width detection sensor 43 has changed from the light reception level RH to the light reception level RF.
If it is determined in step S10 that the other edge 47b is detected (step S10; Yes), the carriage 21 has reached the home position. Therefore, the carriage is moved to the carriage standby position, and the home position detection sequence is completed (step S10). S11).
That is, the position where the edge 47b is detected is the home position.
If it is determined in step S10 that the other edge 47b cannot be detected, an error process is performed (step S12), and the process ends.

Next, paper abnormality detection processing will be described.
FIG. 13 is a flowchart of the sheet abnormality detection process.
FIG. 14 is an explanatory diagram of paper abnormality detection when a skew has occurred as a paper abnormality.
First, the carriage 21 is moved by the above-described procedure (see FIG. 12), and the home position position is detected (step S21).
Subsequently, a cut sheet is loaded (step S22).
Further, the carriage 21 is moved to the left side frame side to the maximum working area, the right edge position and the left edge position of the cut sheet are detected, the sheet width is detected, and the right edge position of the cut sheet is detected as a sheet abnormality detection reference. As a position, a distance (actually, the number of pulses of the carriage drive motor) P _REF from the home position position to the sheet abnormality detection reference position is stored (set) (step S23).
Next, a printing operation based on the inputted printing data is started (step S24).
Each time printing for one line is completed, the right edge position of the cut sheet is used as the paper abnormality determination position, and the distance from the home position position to the paper abnormality determination position (in practice, the number of pulses of the carriage drive motor) ) _PEDG is stored (set) (step S25).

Subsequently, a distance difference ΔP (actually the absolute value of the pulse number difference) between the distance P _REF from the home position position to the sheet abnormality detection reference position and the distance P _EDG from the home position position to the sheet abnormality determination position. Is less than the distance corresponding to the abnormality determination reference pulse number X (step S26).
In the determination in step S26, the distance difference ΔP between the distance P _REF from the home position position to the paper abnormality detection reference position and the distance P _EDG from the home position position to the paper abnormality detection position corresponds to the abnormality determination reference pulse number X. If it is less than the distance to be printed (step S26; Yes), the printing operation is continued (step S29), and it is determined whether or not the printing is finished (step S28).
If it is determined in step S28 that printing has not yet been completed (step S28; No), the process proceeds to step S25 again, and the same process is performed thereafter.
If it is determined in step S28 that printing has been completed (step S28; Yes), the process is terminated.
In the determination in step S26, the distance difference ΔP between the distance P _REF from the home position position to the paper abnormality detection reference position and the distance P _EDG from the home position position to the paper abnormality detection position corresponds to the abnormality determination reference pulse number X. If it is equal to or longer than the distance to be processed (step S26; No), an error process is performed to stop the operation of the printer 10 (step S29), and the process is terminated.
As described above, according to the present embodiment, it is possible to reliably and accurately detect the paper width and the paper abnormality with the single paper width detection sensor 43.
In the above description, the case of paper skew as a paper abnormality has been described. However, it is also possible to detect the case of paper twisting, paper folding, or partial chipping of paper due to paper jamming.
In the above description, it is assumed that the control program for the sheet abnormality detection process is stored in the ROM in advance, but this is not restrictive, and the personal computer or server computer (not shown) is connected via a communication cable or network. However, the control program may be downloaded from the personal computer or server computer. In this case, the control program is stored in a rewritable nonvolatile memory (not shown) in the printer. And a controller should just read a control program from this non-volatile memory, and may perform this.

FIG. 2 is a perspective view showing an external appearance of the front of the printer according to the embodiment of the recording apparatus of the present invention. It is a sectional side view of a printer. FIG. 4 is a perspective view showing a frame configuration with an ink ribbon cartridge removed. It is a perspective view which shows the frame structure of FIG. 3 seeing from the tractor unit side. It is a perspective view which shows the state which mounted | wore the ink ribbon cartridge. It is a perspective view of a carriage. It is a perspective view of a mask ribbon holder. It is a figure which shows the relationship between a sensor and an opening part. It is a figure which similarly shows the relationship between a sensor and an opening part. It is a figure explaining paper width detection and paper absence detection. It is a figure explaining home position detection. It is a process flowchart of a home position detection process. It is a process flowchart of a paper abnormality detection process. FIG. 10 is an explanatory diagram of detection of a paper abnormality when a skew occurs as a paper abnormality.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Printer, 11 ... Recording head, 12 ... Printer main body, 13 ... Tractor unit, 14 ... Sheet guide, 15 ... Upper case, 16 ... Lower case, 19a ... Boss part, 20 ... Recording head, 21 ... Carriage, 22 ... Platen 23 ... Conveying roller, 23a ... Roller shaft, 25 ... Side frame, 25 ... Left and right side frames, 26 ... Right side frame, 27 ... Back frame, 28 ... Carriage shaft, 29 ... Ink ribbon cartridge, 30 ... Tractor, 30a ... Pulley, 30a ... Tractor drive pulley, 30b ... Tractor driven pulley, 31 ... Tractor belt, 41 ... Drive wheel train, 43 ... Paper width detection sensor, 45 ... Paper guide, 45a ... Flat surface, 47 ... Opening, 47a ... Edge , 47b ... edge, 48 ... timing belt, _PEDG ... distance, _PREF ... distance, R F: Light reception level, RH: Light reception level, RP: Light reception level, X: Number of abnormality determination reference pulses, ΔP: Distance difference.

Claims (6)

In a recording apparatus for driving a recording head and a carriage mounted with an optical paper width detection sensor in the main scanning direction to detect a scanning width of the recording head in the main scanning direction,
Set the paper reference position outside the recording paper transport area,
An end position detection unit that scans the carriage and detects one end position of the recording paper in the main scanning direction by the optical paper width detection sensor;
A distance calculating unit that calculates a distance between the edge position and the paper reference position;
A paper abnormality detection unit that detects a paper abnormality when a difference between the distances at two scanning positions is equal to or greater than a predetermined reference difference among a plurality of scans of the carriage performed on the same paper;
A recording apparatus comprising: The recording apparatus according to claim 1,
The sheet abnormality detection unit uses the end position of the recording sheet at any one of the scanning positions of the carriage performed on the same sheet as a sheet abnormality detection reference position, The edge position of the recording paper at another arbitrary one scanning position is a paper abnormality determination position,
When the difference between the distance between the paper abnormality detection reference position and the paper reference position and the distance between the paper abnormality determination position and the paper reference position is equal to or greater than a predetermined reference difference, the paper Detect as abnormal,
A recording apparatus. The recording apparatus according to claim 2, wherein
The recording apparatus according to claim 1, wherein the sheet abnormality detection reference position is an end position of the recording sheet at a scanning position when the sheet width of the sheet is detected. The recording apparatus according to any one of claims 1 to 3,
The recording apparatus, wherein the paper reference position is a home position. In a control method of a recording apparatus for driving a recording head and a carriage mounted with an optical paper width detection sensor in the main scanning direction to detect a scanning width of the recording head in the main scanning direction,
An end position detection process of scanning the carriage and detecting one end position of the recording paper in the main scanning direction by the optical paper width detection sensor;
A distance calculating step of calculating a distance between the edge position and a sheet reference position set in advance outside the recording sheet conveyance area;
Out of a plurality of scans of the carriage performed on the same sheet, a sheet abnormality detection process for detecting a sheet abnormality when a difference between the distances at two scanning positions exceeds a predetermined reference difference;
A control method for a recording apparatus, comprising: In a control program for controlling, by a computer, a recording head and a carriage that drives an optical paper width detection sensor in the main scanning direction to detect the scanning width of the recording head in the main scanning direction.
Scanning the carriage, and detecting one end position of the recording paper in the main scanning direction by the optical paper width detection sensor;
Calculating a distance between the edge position and a paper reference position set in advance outside the recording paper conveyance area;
Control that causes a paper abnormality to be detected when the difference in the distance at two scanning positions exceeds a predetermined reference difference among a plurality of scans of the carriage performed on the same paper. program.

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