JP2000296661A - Printing control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make printing feasible even to paper having a narrow width that does not reach a paper end sensor. SOLUTION: The printing apparatus 16 includes a carriage 162 being furnished with a head 163 for printing to paper 26 and a scanner 166 for picking up the image of paper 26. CPU 10 makes the carriage 162 move to the position where paper 26 is fed when the paper 26 is fed so as to recognize the image by the scanner 166 and distinguish the distal end of the paper 26 on the basis of the image recognized, thereby a judgment is made as to whether the paper 26 is actually fed or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing control apparatus for controlling a printing apparatus provided with a scanner and a print head together with a carriage, and more particularly to detection of a supply or discharge state of printing paper.

[0002]

2. Description of the Related Art Conventionally, in an information processing apparatus provided with a printing device such as a word processor, a paper end sensor (PE sensor) is provided on a paper feeding path of the printing device. By detecting the upper and lower edges of the sheet, whether or not the sheet has been supplied,
Further, it is determined whether or not the sheet has been discharged.

[0003]

However, usually,
The PE sensor is provided only at one position on the paper feeding path. Therefore, even when it is desired to perform printing using narrow paper, printing cannot be performed on paper having a width that cannot reach the PE sensor because the paper cannot be detected.

An object of the present invention is to make it possible to execute printing even on a sheet having a narrow width that cannot reach the paper end sensor.

[0005]

Means of the present invention are as follows. A printing device to which the print control device is applied includes a carriage provided with a printing unit for printing on paper and a scanner for capturing an image of the paper, and supplies paper to the printing unit to perform printing. The determination means of the print control device includes:
When the paper is supplied, the carriage is moved to a position where the paper is to be supplied, and the image is recognized by the scanner,
By determining the leading edge of the sheet based on the recognized image, it is determined whether or not the sheet is actually supplied.

The operation of the means according to the first aspect of the present invention is as follows. When the paper is supplied, the determination unit moves the carriage to a position where the paper is to be supplied, recognizes the image with a scanner, and determines the leading edge of the paper based on the recognized image, thereby determining the leading edge of the paper. It is determined whether or not the supply has actually been made. Therefore, when it is determined that the paper is actually supplied, printing by the printing unit of the printing apparatus can be started, so that printing can be performed even on a paper having a narrow width that cannot reach the paper end sensor. become. Moreover,
Since there is no need to provide the paper end sensor itself,
It leads to cost reduction.

[0007] The means of the invention of claim 2 is as follows.
A printing apparatus to which the print control device is applied includes a carriage provided with a printing unit that prints on paper and a scanner that captures an image of the paper, and discharges the paper after printing. When the paper is ejected after printing, the determination means of the print control device moves the carriage to a position where the paper is present, recognizes the image with the scanner, and determines the presence or absence of the paper based on the recognized image. It is determined whether or not the sheet has been discharged.

[0008] The operation of the means of the invention of claim 2 is as follows. The discriminating means moves the carriage to a position where the paper is present when the paper is ejected after printing, recognizes the image with the scanner, and determines the presence or absence of the paper based on the recognized image, thereby determining whether the paper is present. It is determined whether or not ejection has been performed. Therefore, since the discharge of the sheet can be determined by using the scanner, printing can be performed even on a sheet having a narrow width that cannot reach the paper end sensor. Furthermore, since it is not necessary to provide the paper end sensor itself, the cost is reduced.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

[First Embodiment] FIG. 1A is a diagram showing a configuration of a word processor to which a print control apparatus according to a first embodiment of the present invention is applied. Reference numeral 10 denotes a CPU as a control unit that controls the entire word processor. Reference numeral 12 denotes an input device such as a keyboard, 14 denotes a display device such as a liquid crystal display, and 16 denotes a printing device such as a printer.

Reference numeral 18 denotes a storage device such as a hard disk or a ROM, and reference numeral 20 denotes a RAM. The storage device 18 and the RAM 20 store processing programs and data of the word processor executed by the CPU 10 in advance.
Programs and data stored in the RAM 8 and the RAM 20 are stored in a storage medium 2 such as a floppy disk or an optical (magnetic) disk.
2 or may be received from another device connected via an external data transmission / reception communication line (wired or wireless) 24 by a communication device (not shown).
These may be stored.

Here, as shown in FIG. 1B, the printing section of the printing device 16 transports a sheet (not shown) by a pickup roller 161 and, for example, the head 163 provided on the carriage 162 transfers the sheet to the carriage 162. Printing is performed by thermally transferring the set ink ribbon (not shown), and the ink ribbon is discharged from the printing unit by a discharge roller 164. Then, by detecting the leading end and the trailing end of the sheet by the paper end (PE) sensor 165, the supply and discharge of the sheet are detected.

Further, the printing unit is provided with the carriage 1
A scanner 166 is provided at 62. In other words, the word processor has a so-called OCR function of capturing an image of a sheet to be read conveyed in the same manner as a printing sheet, and converting the image into a text by recognizing characters from the captured image on the sheet to be read.

FIG. 2A is a diagram showing a storage configuration of the RAM 20. As shown in FIG. That is, in this RAM 20,
PE sensor readable paper size, which is the size of paper readable by the PE sensor 165, print data to be actually printed, various error message data for displaying "paper out" or "paper jam", presence or absence of paper A scanner recognition flag (F) indicating whether or not to perform the scanning using the scanner 166. The scanner 1 as shown in FIG.
The actual measurement value (Y) from the upper end of the sheet 66 to the sheet 26, and the logical value (Y) from the upper end of the scanner 166 to the sheet 26
0), correction value (ΔY), retry limit (N), scanner reading area for storing an image read by the scanner 166, PE sensor reading area for storing an image read by the PE sensor 165, work area , Etc. are provided.

Next, the operation in such a configuration will be described. FIG. 3 is a main flowchart for explaining the operation of the word processor to which the print control device according to the first embodiment of the present invention is applied. The program for realizing each function described in this flowchart is stored in the storage device 1 in the form of a program code readable by the CPU 10.
8 or the storage medium 22.

That is, first, it is determined whether or not a predetermined print instruction is given by the input device 12 (step S1).
0), when a print instruction is given, print processing as described in detail below is performed (step S11). Here, the predetermined print instruction includes designation of a paper size, selection of print data, and depression of a “print execution” key (not shown) or the like.

If it is determined that a print instruction has not been given, it is next determined whether a predetermined image recognition instruction has been given (step S12). If this image recognition instruction is not given, processing according to the other instructions will be performed, but this is not directly related to the present invention, and a description thereof will be omitted.

On the other hand, if it is determined that a predetermined image recognition instruction has been given, first, a sheet to be read on which a document to be read or the like is described is supplied (step S1).
4). Then, an image is captured while moving the carriage 162 (step S15), and the captured image is
While storing it in the scanner reading area of AM20,
It is displayed on the display device 14 (step S16). After the process from image capture to display is performed for all reading targets (step S17), the image stored in the scanner reading area of the RAM 20 is converted into text by character recognition (step S18), and the text cannot be recognized. The stored image data is stored in the storage device 18 as a file (step S19). Then, the sheet to be read is discharged (step S20), and the process returns to step S10.

The printing process executed in step S11 is performed according to a series of flowcharts shown in FIGS.

That is, as described above, when the paper size is specified and the print data is selected and a “print execution” key (not shown) is pressed, first, the specified paper size is detected by the PE sensor 165. It is determined whether or not the size is detectable with reference to the PE sensor readable paper size stored in the RAM 20 (step S30). If the size is determined to be readable, RA
The scanner recognition flag (F) of M20 is turned off ("0") (step S31), and if it is determined that the size is unreadable, the scanner recognition flag (F) is turned on ("1"). (Step S32).

Thereafter, the sheet feeding operation is started (step S).
33). And here, the PE sensor 165 and the scanner 1
It is determined which of 66 is used to detect the leading edge of the sheet by referring to the scanner recognition flag (F) (step S34). When the scanner recognition flag (F) is “0”, the leading edge of the sheet is detected using the PE sensor 165, so that the reading is performed by the PE sensor 165 and the read image is stored in the PE sensor reading area of the RAM 20 ( Step S35). When the scanner recognition flag (F) is "1", the leading edge of the sheet is detected by using the scanner 166. Therefore, the carriage 162, that is, the scanner 166 is first moved to the center of the sheet, that is, the sheet 26 based on the size of the designated sheet. Is moved to a position where can be detected (step S36), and a scanner reading process using the scanner 166 is performed (step S37).

In this scanner reading process, as shown in FIG. 2B, first, an image is fetched from the scanner 166 and stored in the scanner reading area of the RAM 20 (step S60). Then, area division is performed based on the color of the captured and stored image (step S6).
1) Analyze each area to analyze the paper 26 and the printer unit (step S62). That is, the storage device 18 or RA
An image of the printer unit (image picked up by the scanner 166) is stored in advance in M20, and a part corresponding to the image is identified as the printer unit, and the other part is identified as the sheet 26. Then, the detected position of the paper 26 at that time is defined as an actual measurement value (Y) from the upper end of the scanner to the paper.
It is stored in the RAM 20.

Next, based on the result of reading by the PE sensor 165 or the scanner 166, the CPU 10
Is determined (step S38). Here, paper 2
If 6 cannot be detected, it is determined whether or not N retries have been performed by referring to the retry limit number (N) in the RAM 20 (step S39). If not, the process returns to step S33. If N retries have been performed, an error message of "paper out" stored in the various error message data areas of the RAM 20 is displayed on the display device 14 (step S40), and the process proceeds to the main routine. Return.

On the other hand, when the sheet 26 is detected, it is determined whether the sheet detection is performed using the PE sensor 165 or the scanner 166 by referring to the scanner recognition flag (F). Step S41). And
If the scanner recognition flag (F) is "0", the flow proceeds to step S44 described later. Also, the scanner recognition flag (F)
Is "1", the logical value (Y0) from the upper end of the scanner 166 to the sheet 26 stored in the RAM 20 in advance.
Then, the difference between the measured value (Y) from the upper end of the scanner 166 and the sheet 26 stored in the RAM 20 in the scanner reading process is calculated, and the result is stored as a correction value (ΔY) in the RAM 20 (step S42). And
The paper 26 is fed by the correction value (ΔY) (step S43).

Thereafter, the sheet 26 is fed to a printing position specified by a page format or the like (step S44), and printing is executed (step S45).

When printing is completed, the paper 26
Is discharged (step S46). And here, PE
Whether the sensor 165 or the scanner 166 is used to detect the trailing edge of the sheet is determined by referring to the scanner recognition flag (F) (step S47). When the scanner recognition flag (F) is “0”, the rear end of the sheet is detected by using the PE sensor 165, so that the reading is performed by the PE sensor 165 and the read image is stored in the PE sensor reading area of the RAM 20. (Step S48). When the scanner recognition flag (F) is “1”, the trailing edge of the sheet is detected by using the scanner 166. Therefore, first, the carriage 162 is moved to the center of the sheet based on the specified sheet size.
That is, after the scanner 166 is moved (step S4).
9) The scanner reading process is performed as described above (step S50).

Then, the PE sensor 165 or the scanner 1
The presence or absence of the sheet 26 is determined based on the reading result of step 66 (step S51). Here, if the paper 26 is not detected, the process returns to the upper routine. However, if the paper 26 is detected, the retry limit (N) in the RAM 20 is further referred to, and N retries are performed. It is determined whether or not the operation has been performed (step S52), and if not, the process returns to step S46. If N retries have been performed, a paper discharge error message such as "paper jam" stored in the various error message data area of the RAM 20 is displayed on the display device 14 (step S53). Return to the main routine.

As described above, according to the first embodiment, by using the scanner 166 in place of the PE sensor 165, it is possible to use a narrow paper which is inserted into a place where the PE sensor 165 is not provided. However, since the leading and trailing edges of the paper can be detected, printing can be performed.

[Second Embodiment] Next, a second embodiment of the present invention will be described.
An embodiment will be described. In the second embodiment, the PE
This is an example in which no sensor is provided, and also describes how to deal with skew of a sheet.

In the second embodiment, the RAM 2
The storage configuration of 0 is as shown in FIG. That is, the RAM 20 according to the present embodiment stores print data, various error message data, the horizontal movement range (X) of the scanner 166 at the time of skew angle measurement as shown in FIG. Paper 26
From the top of scanner 166 to sheet 2
The logical value (Y0), the correction value (ΔY), the retry limit number (N) up to 6, and the scanner 166 as shown in FIG.
The skew angle (α) measured in the above, and the limit of skew (−α0)
And + α0), the number of sets for storing the total number of prints (M)
Area, an error set sheet number area for storing the number of sheets that could not be printed due to skew, an error sheet number (E) counter for counting the total number of sheets that could not be printed, a scanner reading area, A save memory for storing the center position, a work area, and the like are provided.

Next, the operation in such a configuration will be described. In the second embodiment, the operation of the main flowchart shown in FIG. 3 is the same as that of the first embodiment, except for the printing process executed in step S11.

This printing process is performed according to a series of flowcharts as shown in FIGS.

That is, when the designation of the paper size, the selection of the print data, and the designation of the number of prints are performed, and a “print execution” key (not shown) or the like is pressed, the CPU 10 first stores the data in the CPU 10 or the RAM 20. Initialize each configured register, work area, etc. (Step S7)
0). That is, in this initialization, the designated number of prints is set in the set number (M) area, “0” is set in the error number (E) area, and the value of the counter n (not shown) is set to “1”. Initialize.

Thereafter, the carriage 162, that is, the scanner 166 is moved to the initial position (the leftmost end in the example of FIG. 1B) (step S71), and the feeding of the sheet 26 is started (step S72). Then, the carriage 162, that is, the scanner 166 is moved from left to right (step S7).
3) The scanner reading process as described above is performed (step S74). As a result, it is determined whether the paper 26 is recognized by the scanner 166 (step S7).
5) If it is determined that it has not been recognized yet,
It is determined whether the carriage 162, that is, the scanner 166 has been moved to the rightmost end (step S76). If it is determined that the rightmost end has not yet been reached, the process returns to step S73.

When it is determined that the carriage 162, that is, the scanner 166 has reached the rightmost end, it is determined whether the value of the counter n has reached the retry limit number (N) stored in the RAM 20 ( Step S77),
If it is determined that the count has not reached N times yet, the value of the counter n is incremented by "+1" (step S78), and the process returns to step S71.

On the other hand, if it is determined that the value of the counter n has reached the retry limit (N), the value of the counter n is initialized to "1" (step S7).
9) The error message of "paper out" stored in the various error message data areas of the RAM 20 is displayed on the display device 14 (step S80). Then, after waiting for a re-execution instruction (step S81),
The process returns to step S71. That is, if the paper 26 is not present or a paper jam occurs before reaching the scanner position, the operator is notified by displaying an error message. Then, when the operator manually instructs the execution of printing after removing the paper feed or the paper jam manually, the above processing is repeated.

If it is determined in step S75 that the paper 26 has been recognized by the scanner 166, then the center position between the current position and the rightmost end of the carriage 162 is determined (step S82) (step S82). Although not specifically described, the same applies to the method of finding the center of the sheet in the first embodiment).
0 (step S8).
3). That is, if the sheet 26 is skewed or the next sheet is misaligned, the scanner 1 is moved to the current position when printing the next sheet.
Since there is a possibility that the paper cannot be recognized even if 66 is returned, the center of the current paper 26 is set as the recognition position.

Next, the logical value (Y0) from the upper end of the scanner 166 to the sheet 26 stored in the RAM 20 in advance.
Then, the difference between the measured value (Y) from the upper end of the scanner 166 and the sheet 26 stored in the RAM 20 in the scanner reading process is calculated, and the result is stored in the RAM 20 as a correction value (ΔY) (step S84). And
The paper 26 is fed by the correction value (ΔY) (step S85). Thereafter, the scanner 166 is moved in the left-right direction according to the left-right movement range (X) of the scanner 166 stored in the RAM 20, and X is moved as shown in FIG.
The width image is read (step S86). Then, the skew angle α of the sheet 26 is detected from the read image,
It is stored in the RAM 20 (step S87).

Here, the stored skew angle α is RA
It is determined whether or not it is between -α0 and + α0, which is the skew limit stored in advance in M20 (step S8).
8). As a result, when it is determined that the skew degree of the current sheet is within the skew limit, the sheet 26 is fed to the printing position designated by the page format or the like (step S89).
Printing is executed (step S90). On the other hand, if it is determined that the skew degree of the current sheet exceeds the skew limit, the current set number (M) of the RAM 20 is stored in the error set number area as a sheet skew error. At the same time, the error number (E) counter of the RAM 20 is incremented (step S91).

When printing is completed in this way, or when a sheet skew error is set,
6 is performed (step S92), and the carriage 162 is discharged.
That is, the scanner 166 is moved to the position stored in the evacuation memory (step S93) (not particularly described, but the carriage is moved to the center of the sheet when the sheet is discharged in the first embodiment). The same applies to the method), and the scanner reading process as described above is executed (step S94).

Then, based on the reading result of the scanner 166, the presence or absence of the sheet 26 is determined (step S).
95). If the sheet 26 cannot be detected, it is determined whether the value of the counter n has reached the retry limit (N) stored in the RAM 20 (step S96).
If it is determined that the count has not yet reached N times, the value of the counter n is incremented by "+1" (step S97), and the process returns to step S92.

On the other hand, if it is determined that the value of the counter n has reached the retry limit (N), the RAM 20
A paper ejection error message such as "paper jam" stored in the various error message data area is displayed on the display device 14 (step S98). Then, it waits for an instruction for re-execution (step S99). In other words, when the paper 26 is jammed, an error message is displayed to notify the operator, the operator manually clears the jam, and then instructs execution of printing again to proceed to the subsequent processing.

If it is determined that the ejection of the sheet 26 has been detected by the scanner 166 in step S95, or if re-execution is instructed in step S99, the value of the counter n is then changed to the next value. After initial setting to "1" (step S100), the value of the set number (M) area of the RAM 20 is set to "-1" (step S100).
101). Then, as a result, it is determined whether or not the value of the set number (M) area has become “0” (step S1).
02) If not, that is, if the number of sheets to be printed remains, paper is fed (step S103), and the carriage 162, ie, the scanner 166, is moved to the position stored in the evacuation memory (step S104). The scanner reading process as described above is executed (step S10).
5).

Then, based on the reading result of the scanner 166, the presence or absence of the sheet 26 is determined (step S).
106). Here, when the sheet 26 can be detected, the value of the counter n is initialized to “1” (step S107), and the process returns to step S84.

On the other hand, if the paper 26 is not detected, it is determined whether or not the value of the counter n has reached the retry limit number (N) stored in the RAM 20 (step S108). If it is determined that it has not reached the value, the value of the counter n is incremented by "+1" (step S10).
9), and return to step S103. Also, the counter n
Is determined to have reached the retry limit (N), an error message of "paper out" stored in various error message data areas of the RAM 20 is displayed on the display device 14 (step S110). Then, it waits for a re-execution instruction (step S111). When the re-execution instruction is given, the value of the counter n is initialized to "1" (step S112), and the process returns to the step S103.

If it is determined in step S102 that the value of the set number (M) area has become "0", that is, if the processing for all the print-specified numbers has been completed, for example, an error It is determined whether or not a sheet skew error has occurred by referring to the set number area or the error number area (step S).
113). If there is no skewed sheet error, the process immediately returns to the main routine. On the other hand, when there is a paper skew error, an error message of “skew error” stored in various error message data areas of the RAM 20 is displayed on the display device 14 and the skew error is displayed. The number of sheets that have occurred and the number of skew errors that occurred in total are determined by the RA.
After displaying on the display device 14 according to the stored contents of the error set number area and the error number area of M20 (step S114), the process returns to the main routine.

As described above, in the second embodiment,
When the upper end of the sheet 26 is detected by the scanner 166, the skew degree of the sheet 26 is detected by moving the scanner 166 right and left. If the result is equal to or greater than a predetermined skew limit value, the sheet is regarded as skew, and printing is performed without printing.
To discharge. As described above, the scanner 166 is used not only for detecting the upper end of the sheet 26 but also for detecting the skew of the sheet 26. When the sheet 26 is skewed, the sheet 26 is discharged. In addition, printing mistakes can be eliminated.

In the present embodiment, the number and number of sheets discharged without printing are stored, and the contents are displayed after printing is completed.
If the ratio of paper ejected without printing is above a certain value,
Since a defect such as a sheet setting position is considered, it is more preferable to warn the user by displaying the fact.

The paper recognition method is the same as the first and second papers.
However, the present invention is not limited to the above-described embodiment. For example, a moving image area may be recognized as a sheet.

[0050]

According to the present invention, the presence or absence of a sheet can be determined by detecting the leading edge and / or the trailing edge of a sheet by using a scanner instead of the paper end sensor. Can be executed even on a sheet having a narrow width that cannot be reached.

[Brief description of the drawings]

FIG. 1A is a diagram showing a configuration of a word processor to which a print control device according to a first embodiment of the present invention is applied, and FIG. 1B is a mechanical diagram of a printer unit of the printing device in FIG. FIG. 4C is a diagram for explaining a relationship between a theoretical value and a measured value from the upper end of the scanner to the sheet;

FIG. 2A is a diagram showing a storage configuration of a RAM according to the first embodiment, FIG. 2B is a flowchart for explaining a scanner reading process in FIG. 4, and FIG. 2C is a second embodiment of the present invention. FIG. 9D is a diagram illustrating a storage configuration of a RAM in the word processor to which the print control apparatus according to the embodiment is applied, and FIG. .

FIG. 3 is a main flowchart for explaining the operation of a word processor to which the print control device according to the first embodiment is applied;

FIG. 4 is a diagram illustrating a first half of a series of flowcharts for describing a printing process in FIG. 3;

FIG. 5 is a diagram showing the latter half of a series of flowcharts for explaining the printing process in FIG. 3;

FIG. 6 is a diagram illustrating a first part of a series of flowcharts for describing a printing process according to the second embodiment.

FIG. 7 is a diagram illustrating a second part of a series of flowcharts for describing print processing according to the second embodiment.

FIG. 8 is a diagram illustrating a third part of a series of flowcharts for describing print processing according to the second embodiment.

[Explanation of symbols]

 Reference Signs List 10 CPU 12 input device 14 display device 16 printing device 18 storage device 20 RAM 22 storage medium 24 communication line 26 paper 161 pickup roller 162 carriage 163 head 164 discharge roller 165 paper end (PE) sensor 166 scanner

Claims (8)

[Claims] 1. A printing control apparatus comprising a carriage provided with a printing unit for printing on paper and a scanner for capturing an image of the paper, and for controlling a printing apparatus for supplying paper to the printing unit and performing printing. When the paper is supplied, the carriage is moved to a position where the paper is to be supplied, and the image is recognized by the scanner,
A print control apparatus comprising: a determination unit configured to determine whether a sheet is actually supplied by determining a leading edge of the sheet based on the recognized image. 2. A print control device, comprising: a carriage provided with a printing unit for printing on a sheet and a scanner for picking up an image of the sheet, and controlling a printing apparatus for discharging the sheet after printing, wherein the sheet is discharged after printing. In doing so, the carriage is moved to a position where a sheet is present, the image is recognized by the scanner, and the presence or absence of the sheet is determined based on the recognized image to determine whether the sheet is discharged. A print control device comprising a determination unit. 3. The print control device according to claim 1, further comprising a storage unit that captures and stores an image captured by the scanner. 4. The method according to claim 1, wherein when the sheet is ejected after printing, the carriage is moved to a position where the sheet is present, the image is recognized by the scanner, and the presence or absence of the sheet is determined based on the recognized image. 2. The printing control apparatus according to claim 1, wherein it is determined whether or not the sheet has been discharged. 5. The printing apparatus according to claim 1, wherein when the sheet is ejected after the printing, the carriage is moved to a position where the sheet exists, the image is recognized by the scanner, and the lower end of the sheet is determined based on the recognized image. 2. The print control apparatus according to claim 1, wherein when the lower end of the sheet cannot be detected, the fact is notified. 6. The discrimination means detects a skew angle of a sheet by moving the scanner left and right, and when the detected skew angle is a predetermined angle or more, the printing unit does not perform printing. 2. The print control apparatus according to claim 1, wherein the sheet is ejected, and information on the number or the number of sheets ejected without printing is notified. 7. The discrimination means detects a skew angle of a sheet by moving the scanner left and right, and when the detected skew angle is equal to or greater than a predetermined angle, the printing unit does not perform printing. 2. The print control apparatus according to claim 1, wherein the sheet is discharged, and when the ratio of the sheet discharged without printing is equal to or more than a predetermined value, the notification is made. 8. The printing apparatus according to claim 1, further comprising a paper end sensor for detecting a leading edge of the paper at a predetermined position, and using the paper end sensor or the scanner according to the setting of the paper. 2. The printing control apparatus according to claim 1, further comprising a switching unit that automatically switches whether to detect the leading edge of the sheet.