JP2008294884A - Image forming apparatus and image forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of performing a scan operation and a carriage operation in a short period of time without deteriorating precision with a simple configuration without using any vibration absorbing member such as a spring. <P>SOLUTION: The image forming apparatus comprises: an image forming means for forming an image on a printing and recording medium while using a carriage including a recording head; and an image reading means for reading an image to be read. The image forming apparatus further comprises characteristically a carriage movement control means for performing a moving/stop switching control of the carriage during reading operation of the image reading means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an image forming apparatus and an image forming method, and more particularly to an ink jet recording apparatus and an ink jet recording method capable of preventing image quality deterioration due to carriage vibration during printing.
The present invention also relates to a program used for the image forming apparatus and the image forming method, and a recording medium storing the program.

  2. Description of the Related Art In recent years, an image forming apparatus called a multifunction peripheral that has both an image forming function such as a printer and a facsimile and an image reading function such as a scanner has been widely used.

  Examples of the image forming method include a method using a laser recording method and an ink jet recording method in which a carriage having a recording head is reciprocated on a recording medium such as paper. In either method, an image is formed on the entire recording medium by conveying the recording medium in a laser scanning direction or a direction perpendicular to the carriage reciprocation direction.

  On the other hand, as an image reading method, an image pickup device such as a charge coupled device (CCD) or a contact image sensor (CIS) is fixed to convey the original and the entire original is read, or the image pickup device is fixed to the original. There is a method of reading an image by moving it. Note that the image sensor is normally capable of simultaneously detecting one line perpendicular to the relative movement direction between the image sensor and the document, and the entire document can be read by relatively moving in one direction.

  Further, the image forming apparatus can be used as a copier by printing a document read by a scanner using an image forming function. In addition to the function as a copying machine, a multifunction machine that can simultaneously execute an image forming function and an image reading function, such as receiving a facsimile while printing an image from a document and printing it out, is time-consuming. R & D is being carried out as required for shortening and speeding up.

In such an image forming apparatus of an AIO (All In One) system, an inkjet recording method is widely used because of a demand for downsizing of the image forming apparatus in the market. In an ink jet recording apparatus, a facsimile transmission or a copy operation may be performed during a carriage reciprocating operation for image formation.
At this time, the carriage vibration propagates to the image reading means, so that the reading accuracy is lowered and the image quality of the read image is deteriorated.

  For example, Patent Document 1 discloses an image forming apparatus in which spring-like dampers are provided at the left and right ends and the lower end of an image reading unit to suppress the deterioration by absorbing vibration. . However, in the scanner unit vibration prevention control by vibration absorption using a damper, the control is based on calculation from a coefficient of variation such as a vibration period and a spring elastic coefficient, which means an increase in CPU load or a reduction in reliability due to deterioration of the spring. There was a problem.

JP 2003-189025 A

The present invention has been made in view of the above-described problems in the prior art, applies a reliable vibration control of the image reading means without increasing the CPU load, and does not use a vibration absorbing member such as a spring. An object of the present invention is to provide an image forming apparatus and an image forming method capable of executing scanning and carriage operation with a simple configuration without reducing accuracy and in a short time.
Another object of the present invention is to provide a program and a recording medium storing the program used in the image forming apparatus and the image forming method.

  As a result of intensive studies, the present inventors have determined that an image forming unit includes an image forming unit that forms an image on a print recording medium using at least a carriage having a recording head, and an image reading unit that reads an image to be read. The apparatus includes a carriage movement control unit, and the carriage movement control unit performs the movement / stop switching control of the carriage at the time of reading by the image reading unit. As a result, the present invention has been completed.

  That is, in order to solve the above problems, the image forming apparatus, the image forming method, the program, and the recording medium according to the present invention specifically have the technical features described in (1) to (15) below.

(1): An image forming apparatus that includes an image forming unit that forms an image on a print recording medium using a carriage having a recording head and an image reading unit that reads an image to be read. The carriage movement control means controls the carriage movement / stop switching at the time of reading by the image reading means.

(2): The image reading control unit includes an image reading control unit, and the image reading control unit performs reading start / reading stop switching control of the image reading unit when the carriage is moved. An image forming apparatus.

(3) The image forming apparatus according to (2), wherein the image reading control unit stops reading of the image reading unit when the carriage moves.

(4) The image forming apparatus according to (2), wherein the image reading control unit stops reading of the image reading unit during acceleration / deceleration of the carriage movement.

(5): The image forming unit reciprocates the carriage on the print recording medium, and forms an image only in the forward path.
The image reading control unit according to (2), wherein the image reading control unit stops reading of the image reading unit on the forward path of the carriage movement, and reads the image reading unit on the return path of the carriage movement. Forming device.

(6): The image forming unit reciprocates the carriage on the print recording medium to form an image only in the forward path, and the image reading control unit adds the carriage in the forward path and the return path of the carriage movement. The image forming apparatus according to (2), wherein reading of the image reading unit is stopped during deceleration and reading of the image reading unit is performed when the carriage is driven at a constant speed in a return path of the carriage movement. .

(7): The image forming unit reciprocally moves the carriage on the print recording medium to form an image only in the forward path, and the image reading control unit is configured to perform acceleration / deceleration of the carriage in the return path of the carriage movement. The image forming apparatus according to (2), wherein reading of the image reading unit is stopped and reading of the image reading unit is performed when the carriage is driven at a constant speed in the forward path and the return path of the carriage movement. .

(8): The image reading control means reciprocates the image reading means with respect to the image to be read and performs reading in the forward path and the backward path, and the carriage movement control means reads the carriage in the image reading mode. The image forming apparatus according to (2), wherein the image reading unit stops at a return path, and the image reading unit moves faster on the return path of the image reading unit than the forward path of the image reading unit.

(9): The image reading control means reciprocates the image reading means with respect to the image to be read and performs reading in the forward path and the backward path, and the carriage movement control means reads the image in the carriage. The image forming apparatus according to (2), wherein the image reading unit is driven at a constant speed on a return path of the image reading unit, and the image reading unit moves faster on the return path of the image reading unit than on the forward path of the image reading unit. is there.

(10): The image reading control unit reciprocates the image reading unit with respect to the image to be read, performs reading on the forward path of the image reading unit, and sets the carriage on the return path of the image reading unit. Reading is stopped at the time of acceleration / deceleration, reading is performed when the carriage is driven at a constant speed and stopped on the return path of the image reading means, and the image reading means is on the forward path of the image reading means on the return path of the image reading means. The image forming apparatus according to (2), wherein the image forming apparatus moves faster than the image forming apparatus.

(11): The image reading control means reciprocates the image reading means with respect to the image to be read, performs reading in the forward path and the backward path, and when the acceleration / deceleration of the carriage in the forward path of the image reading means Storage means for storing the position of the image reading means, and the image reading control means reads the image reading means at the position stored in the storage means in the return path of the image reading means, Reading of the image reading unit is stopped at a position other than the storage position, and the carriage movement control unit moves the carriage when the image reading unit is in the storage position of the storage unit in the return path of the image reading unit. (2) wherein the image reading unit moves faster on the return path of the image reading unit than on the forward path of the image reading unit. The image forming apparatus according.

(12): The image reading control unit reciprocates the image reading unit with respect to the image to be read, performs reading in the forward path and the backward path, and is performed at the time of acceleration / deceleration of the carriage in the forward path of the image reading unit. Storage means for storing the position of the image reading means, and the image reading control means reads the image reading means at the position stored in the storage means in the return path of the image reading means, Reading of the image reading unit is stopped at a position other than the storage position, and the carriage movement control unit moves the carriage when the image reading unit is in the storage position of the storage unit in the return path of the image reading unit. The image reading unit is driven at a constant speed, and the image reading unit moves faster on the return path of the image reading unit than on the forward path of the image reading unit. The image forming apparatus according to).

(13): An image forming method, wherein an image is formed by the image forming apparatus according to any one of (1) to (12).

(14) A program that causes an image forming apparatus according to any one of (1) to (12) to be executed.

(15): A recording medium that stores the program according to (14) and is readable by a computer.

According to the present invention, an image forming apparatus and an image forming method that do not require a vibration absorbing member such as a spring, can perform scanning and carriage operation with a simple configuration, without reducing accuracy, and in a short time. Can be provided.
In addition, according to the present invention, it is possible to provide a program applicable to the image forming apparatus and the image forming method, and a recording medium storing the program.

The configuration of an image forming apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a schematic diagram showing the configuration of an image forming apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the image forming apparatus of the present invention is an image forming apparatus having a multifunction function. The multi-function image forming apparatus includes a scanner unit (image reading means; including Motor, Lump, and CCD), a FAX unit, a NIC (network IC), and a USB function function as image data input functions. Also, a printer engine unit is provided as an image data output function. The printer engine unit is provided with a carriage having a recording head. In addition, an MFP controller for controlling the image data input function and the image data output function is provided, an LCD panel as a user interface function, a PSU (Power Supply Unit) as a power supply function, and an ARDF (Auto Reverse Document) as a paper feed / discharge function. Feeder), rear multi, and additional tray. Further, an image reading control unit and a carriage movement control unit (not shown) are provided to control the scanner unit and the carriage, which are image reading units, respectively. In addition to the above, a waste liquid tank or the like can be suitably provided.

FIG. 2 is a schematic diagram (apparatus top view) showing the configuration of the inkjet image forming means in the embodiment of the image forming apparatus according to the present invention.
FIG. 3 is a schematic diagram (apparatus front view) showing the configuration of the inkjet image forming means in the embodiment of the image forming apparatus according to the present invention.

  The ink jet image forming means used in the present invention holds a carriage in a guide lot horizontally mounted on left and right side plates (not shown), and passes through a timing belt passed between a driving pulley and a driven pulley by a main scanning motor. Move to scan.

  In this carriage, for example, a recording head composed of four liquid ejection heads that eject ink droplets of each color of yellow (Y), cyan (C), magenta (M), and black (K) is provided with a plurality of ink ejection ports ( The nozzle rows on the nozzle surface on which the nozzles are formed are arranged in a direction (sub-scanning direction) perpendicular to the main scanning direction, and are mounted with the ink discharge port direction facing downward. In addition, although the independent liquid discharge head is used here, it is also possible to employ a configuration in which one or a plurality of heads having a plurality of nozzle arrays for discharging the recording liquid of each color is used. Further, the number of colors and the arrangement order are not limited to this.

  As an inkjet head constituting a recording head, a piezoelectric actuator such as a piezoelectric element, a thermal actuator that uses a phase change caused by film boiling of a liquid using an electrothermal transducer such as a heating resistor, and a metal phase change caused by a temperature change are used. A shape memory alloy actuator, an electrostatic actuator using an electrostatic force, or the like provided as pressure generating means for generating a pressure for discharging a droplet can be used.

  The carriage is provided with an encoder scale formed with slits along the main scanning direction, and the carriage is provided with an encoder sensor for detecting the slit of the encoder scale, thereby detecting the position of the carriage in the main scanning direction. A linear encoder is configured.

On the other hand, in order to transport the recording paper, a transport belt is provided as a transport means for electrostatically attracting the recording paper and transporting the recording paper at a position facing the recording head.
This conveyor belt is an endless belt, and is arranged between the conveyor roller and the tension roller so as to circulate in the belt conveyance direction (sub-scanning direction). Charged).

  The transport belt may be a single-layer belt or a multi-layer (two or more layers) belt. In the case of a single-layer conveyor belt, it contacts the paper or charging roller, so the entire layer is formed of an insulating material. In the case of a transport belt having a multilayer structure, it is preferable that the side that contacts the paper or the charging roller is formed of an insulating layer, and the side that does not contact the paper or the charging roller is formed of a conductive layer.

FIG. 4 is a schematic diagram showing the configuration of the image reading means in the embodiment of the image forming apparatus according to the present invention.
Main components constituting the image reading means include a glass substrate and a CCD module. The read image is placed on the glass substrate, and RGB image data is captured by scanning the CCD module. Image processing for converting the captured RGB data into YMCK data is performed by the host PC or image forming apparatus, and image formation is performed.

FIG. 5 is a flowchart showing a control method in the first embodiment of the image forming apparatus according to the present invention.
When a print command is input from the operation unit in the power supply state (1) (2), the control method of the scanner unit is determined according to the set print mode.
The set print mode is a print condition set in the initial state in the image forming apparatus or set by the user from the printer driver. The print mode generally means settings such as high image quality and high speed. When the image quality is high, the scanner reading and printing need to be performed without vibration as much as possible.

In this control method, when the print mode is high image quality, the scanner stop control is validated (6). On the other hand, when the print mode is high speed, the scanner stop control becomes invalid (3), and the scanner reading (4) and the printing operation (image formation) are started as soon as a request command is input. When the scanner reading and the image formation are completed, the state shifts to a print request standby state or a power-off state (5).
However, the conditions for setting the scanner stop control are not necessarily high image quality and high speed, and may be other printing conditions.

When the scanner stop control is enabled (6), a control flow after the scanner stop control will be described.
In the above-described print mode setting (3), the printing operation (image formation) of the image forming apparatus is fixed to one of bidirectional printing (7) and one-way printing (8).
Here, bi-directional printing is a printing method that performs printing in the forward and backward directions of the carriage, and unidirectional printing is a printing method that performs printing in the forward and backward directions of the carriage. In general, when high image quality is obtained by printing, one-way printing is performed. Conversely, when not so high image quality is obtained, bidirectional printing is performed.
Setting in scanner reading control is performed by unidirectional printing (7) or bidirectional printing (8). The scanner reading control for bidirectional printing (7) is shown in FIG. 7, and the scanner reading control for unidirectional printing (8) is shown in FIG.
When the setting is completed, scanner reading (9) and printing operation are performed. Then, after the scanner reading (9) and the printing operation are completed, the state shifts to a print request standby state or a power-off state (10).

  A program for performing these controls is prepared in advance in the image forming apparatus, or is a file in a format that can be downloaded or installed, or an executable format, a CD-ROM, a flexible disk (FD), a CD-R. It is assumed that the program is recorded on a computer-readable recording medium such as a DVD (Digital Versatile Disk) and installed.

Next, before explaining the scanner reading control in the image forming apparatus according to the present invention, a general scanner will be described using a graph showing the relationship between the carriage speed and the moving distance in the conventional image forming apparatus shown in FIG. Read control will be described.
When a print request (command) is input to the image forming apparatus and the print data is determined, the carriage operation is started while transmitting the print data to the head.
The carriage accelerates to a predetermined speed, performs a constant speed operation when the printing speed is reached, and decelerates when approaching the end point in the main scanning direction.
In general, since the printing accuracy is deteriorated due to carriage vibration and speed variation during the acceleration / deceleration period, printing is often performed only during the constant speed period, and printing is not performed during acceleration / deceleration.

FIG. 7 is a diagram for explaining scanner reading control in bidirectional printing (7) which is scanner reading control in the image forming apparatus according to the present invention.
In the scanner reading control method in bidirectional printing, (7-1) indicates a case where higher image quality is required, and (7-2) indicates a case where medium image quality (performance-oriented) is required.
In (7-1), since the scanner reading is not performed during the carriage operation (printing), the scanner reading image quality does not deteriorate.
In (7-2), scanner reading is not performed during acceleration / deceleration of the carriage. That is, since reading is performed only while the carriage is driven at a constant speed, the scanner image quality can be prevented from being deteriorated, and the reading efficiency is higher than in the case (I).

FIG. 8 is a diagram illustrating scanner reading control in one-way printing (8) which is scanner reading control in the image forming apparatus according to the present invention.
In the scanner reading control method in unidirectional printing, (8-1) shows a case where printing is highly accurate and the scanner reading is high image quality, and (8-2) shows that printing is high accuracy and the scanner reading is medium-high. (8-3) and (8-4) indicate cases where printing is medium-high accuracy and scanner reading is medium-high accuracy.
In (8-1), the scanner reading is not performed during the carriage operation period (during printing) (both the forward path and the backward path), so that the printing and scanner reading are not deteriorated.
In (8-2), since the scanner reading is not performed during the carriage forward pass period, the printing and scanner reading do not deteriorate. Also, scanner reading is not performed during the carriage return path acceleration / deceleration period, that is, reading is performed only during the carriage constant speed period, so that scanner reading deterioration can be prevented.
In (8-3), since scanner reading is not performed during the forward path acceleration / deceleration period of the carriage, deterioration of printing and scanner reading can be prevented. Further, since scanner reading is not performed during the carriage return pass period, deterioration of scanner reading can be prevented.
In (8-4), since the scanner reading is not performed during the forward path acceleration / deceleration period of the carriage, the deterioration of printing and scanner reading can be prevented. In addition, scanner reading is not performed during the return path acceleration / deceleration period of the carriage, so that deterioration of scanner reading can be prevented.

Further, print control applicable to the image forming apparatus according to the present invention will be described.
A suitable control method can be applied to the print control of the image / picture forming apparatus according to the present invention. However, the cross control is applied to the present embodiment, and the cross control will be described below.

  “Cross control” refers to control in which both driving are cooperatively overlapped in driving in the main scanning direction of the carriage on which the recording head is mounted and in driving in the sub-scanning direction when transporting the recording medium. In order to speed up the printing process, ideally, the main scan (CR) is started before the sub-scan (LF) is completed, and the LF is stopped just when the CR reaches the recording area. The timing is managed.

  If such time management is not performed, the CR reaches the recording area while the LF is operating, causing skew recording, and conversely, recording is not performed without overlapping with the LF driving. Useless CR idle running section will occur.

[Second Embodiment]
The second embodiment of the image forming apparatus according to the present invention has the same configuration as the first embodiment except that the method for controlling the scanner and the carriage is different.
FIG. 9 is a flowchart showing a control method in the second embodiment of the image forming apparatus according to the present invention.
When a print request is input from the operation unit or the like in the power supply state, the control method for the scanner unit / carriage operation is determined according to the set print mode.
The set print mode is a print condition set in the initial state in the image forming apparatus or set by the user from the printer driver. The print mode generally means settings such as high image quality and high speed. When the image quality is high, the scanner reading and printing need to be performed without vibration as much as possible.

In the control method of the present embodiment, when the print mode is high image quality, rescanning (return scan) is validated in addition to normal scanning (forward pass scan). This is effective when high-accuracy scanning cannot be performed due to vibration caused by carriage operation during normal scanning.
On the other hand, when the print mode is high speed, the rescan is invalid and the scanner reading and printing operations are started as soon as a request command is input.
However, the conditions for setting the rescan need not necessarily be high image quality and high speed, but may be other printing conditions.

FIG. 10 is a schematic diagram illustrating the configuration and operation of the scanner according to the present embodiment.
FIG. 11 is a graph showing the relationship between the scanner moving speed and the scanner reading position during the scanner operation in the present embodiment.
Scanner movement speeds / scanner reading positions A and B shown in FIG. 11 represent points A and B at the time of scanning in FIG. 10, respectively.
A high state (position indicating a positive value) of the scanner reading position is a position where the scanner reads, and a low state (a position where the value on the vertical axis in FIG. 11 indicates zero) is a position where the scanner does not read. In addition, the carriage is controlled to drive regardless of the forward or backward path.

  At this time, since the carriage is stopped or driven at a constant speed during the forward scan, there is no vibration and there is no need to perform a rescan (return scan).

FIG. 12 is a schematic diagram illustrating an example of the configuration and operation of a scanner when performing rescanning in the present embodiment. Here, a normal scan (forward scan) and a rescan (return scan) are performed as shown.
FIG. 13 is a graph showing an example of the positional relationship between the scanner and the carriage during normal scanning (forward scanning) and re-scanning (return scanning) in the present embodiment.
At this time, the carriage is not controlled during the forward scan. If the carriage operation during the forward scan is confirmed, the backward scan is executed.
Since the carriage operation is stopped during the backward scan, a highly accurate image can be read.
In addition to confirming the carriage operation during the forward scan, the vibration may be confirmed using a vibration detection sensor that detects vibration when an external impact is applied.

FIG. 14, FIG. 15, FIG. 16, and FIG. 17 are graphs showing other examples of the positional relationship between the scanner and the carriage during normal scanning (forward scanning) and re-scanning (return scanning) in the present embodiment. .
In the case of the control method as shown in FIG. 14, the carriage is not controlled during the forward scan. If the carriage operation during the forward scan is confirmed, the backward scan is executed. During the backward scan, the carriage is driven at a constant speed.
Since the carriage is driven at a constant speed during the backward scan, it is possible to read an image with medium and high accuracy.
In addition to confirming the carriage operation during the forward scan, the vibration may be confirmed using a vibration detection sensor that detects vibration when an external impact is applied.

In the case of the control method as shown in FIG. 15, the carriage is not controlled during the forward scan. If the carriage operation during the forward scan is confirmed, the backward scan is executed. During the backward scan, scanning is performed without controlling the carriage. However, since scanning is not performed when the carriage is accelerated or decelerated, a highly accurate image can be read.
In addition to confirming the carriage operation during the forward scan, the vibration may be confirmed using a vibration detection sensor that detects vibration when an external impact is applied.

In the case of the control method as shown in FIG. 16, the carriage is not controlled during the forward scan. If the carriage operation during the forward scan is confirmed, the vibration position by the operation (vibration position by acceleration / deceleration) is stored, and the backward scan is executed. At the time of the backward scan, since the carriage is stopped again at the vibration position where the scan stored in the forward path is insufficient, a highly accurate image can be read.
In addition to confirming the carriage operation during the forward scan, the vibration may be confirmed using a vibration detection sensor that detects vibration when an external impact is applied.

In the case of the control method as shown in FIG. 17, the carriage is not controlled during the forward scan. If the carriage operation during the forward scan is confirmed, the vibration position by the operation (vibration position by acceleration / deceleration) is stored, and the backward scan is executed. During the backward scan, the carriage is re-scanned while driving at a constant speed at a vibration position where the scan stored in the forward path is insufficient, so that a medium-high-precision image can be read.
In addition to confirming the carriage operation during the forward scan, the vibration may be confirmed using a vibration detection sensor that detects vibration when an external impact is applied.

FIG. 18 is a schematic diagram illustrating the configuration of a sensor and an encoder sheet that are arranged to store the position at which carriage vibration is detected during forward scanning.
FIG. 19 is a graph showing the relationship between the encoder pulse detected by the sensor and the carriage speed.
The vibration of the carriage is detected by reading the encoder sheet by a sensor (registration sensor) located on the side of the carriage. At this time, if the carriage is at a constant speed, the encoder pulse width becomes t1 in FIG. Further, at the time of acceleration / deceleration, the encoder pulse width read by the sensor is widened as shown by t in FIG.
Therefore, it is possible to determine the position at the time of acceleration / deceleration by providing the sensor and encoder pulse which are storage means. With this configuration, it is possible to determine the position that has been accelerated / decelerated during the forward scan, store it in the memory, and rescan the storage position during the backward scan, so that a highly accurate image can be read.

  The above-described cross control is also applied to the print control in the present embodiment.

  As described above, according to the first and second embodiments of the image forming apparatus according to the present invention, a vibration absorbing member such as a spring is not used, and the accuracy of scanning and carriage operation is not reduced with a simple configuration. In addition, an image forming apparatus and an image forming method that can be executed in a short time can be provided.

1 is a schematic diagram illustrating a configuration in an embodiment of an image forming apparatus according to the present invention. 1 is a schematic view (apparatus top view) showing a configuration of an inkjet image forming unit in an embodiment of an image forming apparatus according to the present invention. 1 is a schematic diagram (apparatus front view) showing a configuration of an inkjet image forming unit in an embodiment of an image forming apparatus according to the present invention. 1 is a schematic diagram illustrating a configuration of an image reading unit in an embodiment of an image forming apparatus according to the present invention. 3 is a flowchart showing a control method in the first embodiment of the image forming apparatus according to the present invention. A graph showing the relationship between carriage speed and movement distance in a conventional image forming apparatus 6 is a diagram illustrating scanner reading control in bidirectional printing that is scanner reading control in the image forming apparatus according to the present invention. FIG. FIG. 6 is a diagram illustrating scanner reading control in one-way printing that is scanner reading control in the image forming apparatus according to the present invention. 3 is a flowchart showing a control method in the second embodiment of the image forming apparatus according to the present invention. It is the schematic explaining the structure and operation | movement of a scanner in this Embodiment. It is a graph which shows the relationship between the scanner moving speed at the time of the scanner operation | movement in this Embodiment, and a scanner reading position. It is the schematic explaining an example of a structure and operation | movement of a scanner in the case of performing a rescan in this Embodiment. 6 is a graph illustrating an example of a positional relationship between a scanner and a carriage during normal scanning and re-scanning in the present embodiment. 10 is a graph showing another example of the positional relationship between the scanner and the carriage during normal scanning and during rescanning in the present embodiment. 10 is a graph showing another example of the positional relationship between the scanner and the carriage during normal scanning and during rescanning in the present embodiment. 10 is a graph showing another example of the positional relationship between the scanner and the carriage during normal scanning and during rescanning in the present embodiment. 10 is a graph showing another example of the positional relationship between the scanner and the carriage during normal scanning and during rescanning in the present embodiment. It is the schematic explaining the structure of the sensor arrange | positioned in order to memorize | store the position which detected the vibration of the carriage at the time of an outward scan, and an encoder sheet | seat. It is a graph which shows the relationship between the encoder pulse and the carriage speed which the sensor detected.

Explanation of symbols

  t, t1 Encoder pulse width

Claims (15)

Image forming means for forming an image on a print recording medium using a carriage having a recording head;
In an image forming apparatus including an image reading unit that reads an image to be read,
A carriage movement control means;
The carriage movement control means controls the carriage movement / stop switching at the time of reading by the image reading means. Having image reading control means,
The image forming apparatus according to claim 1, wherein the image reading control unit performs reading start / reading stop switching control of the image reading unit when the carriage moves.   The image forming apparatus according to claim 2, wherein the image reading control unit stops reading of the image reading unit when the carriage moves.   The image forming apparatus according to claim 2, wherein the image reading control unit stops reading of the image reading unit during acceleration / deceleration of the carriage movement. The image forming unit reciprocally moves the carriage on the print recording medium, and performs image formation only in the forward path;
3. The image forming apparatus according to claim 2, wherein the image reading control unit stops reading of the image reading unit in a forward path of the carriage movement, and reads the image reading unit in a backward path of the carriage movement. apparatus. The image forming unit reciprocally moves the carriage on the print recording medium, and performs image formation only in the forward path;
The image reading control means stops reading of the image reading means during acceleration / deceleration of the carriage on the forward path and the return path of the carriage movement, and reads the image reading means when driving the carriage at a constant speed on the return path of the carriage movement. The image forming apparatus according to claim 2, wherein: The image forming unit reciprocally moves the carriage on the print recording medium, and performs image formation only in the forward path;
The image reading control means stops reading of the image reading means during acceleration / deceleration of the carriage on the return path of the carriage movement, and reads the image reading means when driving the carriage at a constant speed on the forward path and return path of the carriage movement. The image forming apparatus according to claim 2, wherein: The image reading control means reciprocates the image reading means with respect to the image to be read, performs reading in the forward path and the return path,
The carriage movement control means stops the carriage on the return path of the image reading means,
The image forming apparatus according to claim 2, wherein the image reading unit moves faster in the return path of the image reading unit than in the forward path of the image reading unit. The image reading control means reciprocates the image reading means with respect to the image to be read, performs reading in the forward path and the return path,
The carriage movement control means drives the carriage at a constant speed in the return path of the image reading means,
The image forming apparatus according to claim 2, wherein the image reading unit moves faster in the return path of the image reading unit than in the forward path of the image reading unit. The image reading control means reciprocates the image reading means with respect to the image to be read, performs reading on the forward path of the image reading means, and at the time of acceleration / deceleration of the carriage on the return path of the image reading means. Reading is stopped, and reading is performed when the carriage is driven at a constant speed and stopped on the return path of the image reading unit;
The image forming apparatus according to claim 2, wherein the image reading unit moves faster in the return path of the image reading unit than in the forward path of the image reading unit. The image reading control means reciprocates the image reading means with respect to the image to be read, performs reading in the forward path and the return path,
Storage means for storing the position of the image reading means at the time of acceleration / deceleration of the carriage in the forward path of the image reading means;
The image reading control unit reads the image reading unit at a position stored in the storage unit in a return path of the image reading unit, and stops reading the image reading unit at a position other than the position stored in the storage unit. ,
The carriage movement control means stops the carriage when the image reading means is in a position stored in the storage means in the return path of the image reading means,
The image forming apparatus according to claim 2, wherein the image reading unit moves faster in the return path of the image reading unit than in the forward path of the image reading unit. The image reading control means reciprocates the image reading means with respect to the image to be read, performs reading in the forward path and the return path,
Storage means for storing the position of the image reading means at the time of acceleration / deceleration of the carriage in the forward path of the image reading means;
The image reading control unit reads the image reading unit at a position stored in the storage unit in a return path of the image reading unit, and stops reading the image reading unit at a position other than the position stored in the storage unit. ,
The carriage movement control means drives the carriage at a constant speed when the image reading means is in a position stored in the storage means in the return path of the image reading means,
The image forming apparatus according to claim 2, wherein the image reading unit moves faster in the return path of the image reading unit than in the forward path of the image reading unit.   An image forming method, wherein an image is formed by the image forming apparatus according to claim 1.   A program that causes an image forming apparatus according to any one of claims 1 to 12 to be executed.   A recording medium storing the program according to claim 14 and being readable by a computer.

Images