JP2007098759A - Recording device - Google Patents

Abstract

An object of the present invention is to eliminate the need for a manufacturing process for storing individual conveyance correction values in the manufacturing process, and to flexibly cope with changes in conveyance errors due to aging of recording material conveying means and characteristics of new types of recording materials. And a recording apparatus capable of performing accurate conveyance correction with high accuracy.
A first PW sensor 341 and a second PW sensor 342 are disposed at a portion facing a recording surface of a recording sheet P of a carriage 61 with a constant interval α in the sub-scanning direction Y. The recording control unit 100 first transports the recording paper P before recording execution in the sub-scanning direction Y prior to recording execution control on the recording paper P, and the leading end of the recording paper P in the transporting direction is detected by the first PW sensor 341. The conveyance control amount β from the time point detected to the time point detected by the second PW sensor 342 is acquired. Then, a conveyance correction value γ for correcting the deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording paper P is calculated from the relationship between the conveyance control amount β and the interval α.
[Selection] Figure 4

Description

  The present invention includes a carriage on which a recording head is mounted and arranged to be able to reciprocate in the main scanning direction with respect to the recording material, a recording material conveying means capable of conveying the recording material in the sub-scanning direction, and the carriage Control for forming dots on the recording surface of the recording material based on the recording data while reciprocating the recording material in the main scanning direction and control for conveying the recording material in the sub-scanning direction by a predetermined conveying amount by the recording material conveying means. The present invention relates to a recording apparatus that includes a recording control unit that executes recording on a recording surface of a recording material.

  A carriage having a recording head and disposed so as to reciprocate in the main scanning direction with respect to the recording material, and a recording material conveying means capable of conveying the recording material in the sub-scanning direction. Control to form dots on the recording surface of the recording material while reciprocating in the scanning direction and control to convey the recording material in the sub-scanning direction by a predetermined conveyance amount by the recording material conveying means In a recording apparatus having a configuration for performing recording on the recording surface of the recording material, the recording control means transports the recording material when the recording material is transported in the sub-scanning direction by a predetermined transporting amount. An error occurs between the control amount and the actual recording material conveyance amount.

  The error in the conveyance amount of the recording material (hereinafter referred to as “conveyance error”) causes a decrease in the recording image quality, but the recording material conveyed as described below is caused by the recording material conveyance means. It is roughly divided into those caused by the material. The transport error caused by the recording material transport unit is, for example, a transport error caused by variations in the shape of each component constituting the recording material transport unit and the characteristics of the drive motor. Further, the conveyance error caused by the recording material to be conveyed is, for example, the frictional resistance of the surface sandwiched between the conveyance rollers (recording material conveying means) depending on the type of the recording material such as plain paper or photo paper. Because of the difference, this is a transport error caused by a difference in the amount of slip of the recording material on the contact surface with the peripheral surface of the transport roller.

  As an example of the prior art that can reduce the conveyance error of such a recording material and reduce the deterioration of the recording image quality caused by the conveyance error, the recording medium is recorded for each individual recording apparatus in the manufacturing process of the recording apparatus. A transport error caused by the material transport means is measured by test pattern printing or the like to calculate a unique transport correction value in advance, and the transport correction value is stored in advance in a storage medium (ROM or the like) inside the recording apparatus and held. A recording apparatus that corrects a conveyance control amount based on a conveyance correction value held in a recording medium when recording on a recording material is known (for example, see Patent Document 1). A conveyance error caused by a recording material conveyance unit unique to each recording apparatus can be corrected with high accuracy, and a conveyance correction value for each type of recording material is stored as table data or the like in a storage medium (ROM or the like). In this case, the conveyance error caused by the recording material can be corrected appropriately.

JP 2003-11345 A

However, in the above-described prior art, a manufacturing cost is increased because a process for determining a conveyance correction value by performing test pattern printing or the like for each individual in the manufacturing process of the recording apparatus and storing it in a recording medium is required. End up. In addition, if test pattern printing or the like is performed for each type of recording material that can be recorded and a conveyance correction value is determined for each type of recording material, the manufacturing cost may be significantly increased. Furthermore, since the conveyance correction value must be determined in advance and stored in a storage medium such as a ROM, a dedicated storage area must be secured in the storage medium, which may increase the manufacturing cost. is there.
Furthermore, since the conveyance correction is always performed based on the fixed conveyance correction value determined at the time of manufacture, when the conveyance error caused by the recording material conveyance means changes due to secular change or the like, the conveyance error increases and recording is performed. There is a risk that the image quality will deteriorate.
Further, every time recording on the recording material is performed, the type information of the recording material is acquired from the setting of the printer driver or the like, and the conveyance correction value is selected according to the type of the recording material, and the conveyance correction calculation is performed. Since it must be reflected, the recording control procedure becomes complicated, and it becomes impossible to correct an appropriate conveyance error corresponding to a new type of recording material that appears after manufacturing the recording apparatus.

  The present invention has been made in view of such a situation, and the problem is that a manufacturing process for individually storing a conveyance correction value unique in the manufacturing process is not required, and that the recording material conveying means is secularly changed. It is an object of the present invention to provide a recording apparatus capable of performing appropriate conveyance correction with high accuracy by flexibly responding to the accompanying change in conveyance error and the characteristics of a new type of recording material.

  In order to achieve the above object, according to a first aspect of the present invention, a recording head is mounted, a carriage that is reciprocally movable in the main scanning direction with respect to the recording material, and the recording material in the sub-scanning direction. Recording material transporting means capable of transporting to the recording medium, control for forming dots on the recording surface of the recording material while reciprocating the carriage in the main scanning direction, and recording material by the recording material transporting means And a recording control means for executing recording on the recording surface of the recording material by executing control for conveying the recording material in the sub-scanning direction by a predetermined conveyance amount, wherein the carriage includes the recording material A first recording material detection unit and a second recording material detection unit capable of detecting the end of the recording material in a non-contact manner at a portion facing the recording surface of the recording material conveyed by the conveyance unit. Are arranged at intervals α in the sub-scanning direction, The recording control means conveys the recording material before execution of recording in the sub-scanning direction, and the second recording target from the time point when the leading end of the recording material in the conveyance direction is detected by the first recording material detection means. A conveyance correction for acquiring a conveyance control amount until it is detected by the material detection unit and correcting a deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording material from the relationship between the conveyance control amount and the interval α. The recording apparatus is characterized in that a value is calculated and the conveyance correction of the recording material is performed based on the calculated conveyance correction value.

  The first recording material detection unit and the second recording material detection unit are disposed with an interval α in the recording material conveyance direction (sub-scanning direction). That is, the actual transport amount when the leading end in the transport direction of the recording material is transported from the detection position of the first recording material detection means to the detection position of the second recording material detection means is an interval α. This means that the carrying amount is equal. On the other hand, the transport control amount at this time should theoretically coincide with the interval α, but the transport error due to the recording material transport means as described above or the transport error due to the transported recording material. Does not necessarily match. In other words, from the difference between the conveyance control amount at this time and the interval α, how much the actual conveyance amount of the recording material by the recording material conveyance unit deviates from the conveyance control amount from the recording control unit. Can be identified. Therefore, a conveyance correction value for correcting the deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording material can be calculated from the difference between the conveyance control amount and the interval α at this time.

  As described above, the recording apparatus according to the first aspect of the present invention shows how much the actual conveyance amount of the recording material by the recording material conveyance unit deviates from the conveyance control amount from the recording control unit. Since there is provided a means capable of specifying and calculating the conveyance correction value, it is possible to obtain an effect that a manufacturing process for individually storing a specific conveyance correction value in the manufacturing process becomes unnecessary. Therefore, since the manufacturing process of the recording apparatus can be simplified, the operational effect that the manufacturing cost of the recording apparatus can be greatly reduced is obtained.

  The recording apparatus according to the first aspect of the present invention can also reduce the storage capacity for holding a fixed conveyance correction value in a storage medium such as a ROM, thereby reducing the component cost. The effect that it can be obtained is also obtained.

  Furthermore, the recording apparatus according to the first aspect of the present invention specifies how much the actual conveyance amount of the recording material by the recording material conveyance unit deviates from the conveyance control amount from the recording control unit. Therefore, it is possible to calculate an optimum conveyance correction value in the recording apparatus at that time, either periodically or at any time, so that the conveyance correction value can be calculated. It is possible to perform recording while maintaining appropriate conveyance correction with high accuracy over a long period of time, flexibly responding to changes in conveyance errors due to aging of the recording material conveyance means and characteristics of new types of recording materials. The effect is obtained.

According to a second aspect of the present invention, in the first aspect described above, when the recording control unit executes recording on the recording material, the recording material before the recording is executed before the recording is started each time. Is conveyed in the sub-scanning direction, and the conveyance control amount from the time when the leading end of the recording material in the conveying direction is detected by the first recording material detection unit to the detection by the second recording material detection unit And a conveyance correction value for correcting a deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording material is calculated from the relationship between the conveyance control amount and the interval α, and the calculated conveyance correction value The recording apparatus is configured to execute conveyance correction during execution of recording on the recording material.
As described above, when recording on the recording material is performed, a conveyance correction value for correcting the deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording material is calculated every time recording is started. Therefore, it is possible to always perform recording by setting a conveyance correction value optimum for the type of recording material that is a recording execution target with high accuracy.

  According to a third aspect of the present invention, in the first aspect or the second aspect described above, the carriage includes the first recording material detection unit and the second recording material detection unit. In the recording apparatus, the recording material is disposed so that the leading end in the transport direction of the recording material can be detected in the process of transporting the recording material to the predetermined recording start position in the sub-scanning direction.

  Thus, since the leading end in the transport direction of the recording material can be detected in the process of transporting the recording material to the predetermined recording start position in the sub-scanning direction, the recording material for determining the transport correction value can be detected. Conveyance and conveyance of the recording material for placing the recording material at the recording start position can be performed simultaneously. That is, when the recording material is transported to the recording start position, it is possible to make a state where the calculation of the optimum transport correction value for the recording material has already been completed. Therefore, since the recording can be started immediately after the recording material is transported to the recording start position, the throughput during recording is hardly reduced by calculating the optimal transport correction value. The effect that it can be obtained is obtained.

  According to a fourth aspect of the present invention, in any one of the first to third aspects described above, the carriage is reciprocated in the main scanning direction, whereby the first recording material detection unit and the first recording material detection unit. The recording material detection unit has a configuration capable of detecting the positions of both ends of the recording material in the main scanning direction on the conveyance path by the recording material conveyance unit by one or both of the recording material detection units. The recording device.

  As described above, since the positions of both ends of the recording material in the main scanning direction as well as the leading end of the recording material in the sub-scanning direction can be detected, the recording material being conveyed by the recording material conveying means The length in the main scanning direction and the position in the main scanning direction can be detected. Therefore, since it is possible to execute the recording by setting the recording execution positions in the main scanning direction and the sub-scanning direction with respect to the recording material with higher accuracy, for example, a part of the recording image is interrupted at the end of the recording material. It is possible to reduce the risk that the margins of the four sides are uneven and the widths of the margins of the four sides are uneven.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects described above, the recording surface of the recording material while slidingly supporting the recording material conveyed by the recording material conveying means. A platen that defines a predetermined distance between the recording head and the head surface of the recording head, and the first recording material detection means and the second recording material detection means include a recording material sliding contact surface of the platen. And an optical sensor capable of detecting the end of the recording material on the platen in a non-contact manner based on the difference between the light reflectance of the recording material and the light reflectance of the recording surface of the recording material. Recording device.
In this way, the optical type that can detect the end of the recording material on the platen in a non-contact manner from the difference between the light reflectance of the recording material sliding surface of the platen and the light reflectance of the recording surface of the recording material By using the sensor, it is possible to configure a first recording material detection unit and a second recording material detection unit that can detect the end of the recording material in a non-contact manner.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a schematic configuration of an ink jet recording apparatus as an example of a “recording apparatus” according to the present invention will be described.

FIG. 1 is a plan view of an essential part of an ink jet recording apparatus according to the present invention, and FIG. 2 is a side view thereof. FIG. 3 is a schematic block diagram of the ink jet recording apparatus according to the present invention.
The ink jet recording apparatus 50 includes a recording head 62 that performs recording by ejecting ink onto a recording paper P as a “recording material”, and a carriage that can reciprocate in the main scanning direction X with respect to the recording paper P. A carriage 61 supported by the guide shaft 51 is provided. The carriage 61 is equipped with a recording head 62 and first PW sensor 341 and second PW sensor 342, which will be described later, and the rotational driving force of the CR motor 63 (FIG. 3) is driven by a belt transmission mechanism using an endless belt (not shown). It is transmitted and reciprocates in the main scanning direction X. At a position facing the head surface of the recording head 62, the recording paper P conveyed by a conveyance driving roller 53 and a conveyance driven roller 54, which will be described later as “recording material conveying means”, is slidably supported and supported on the recording paper P. A platen 52 is provided that defines a predetermined distance between the recording surface and the head surface of the recording head 62.

  A known capping device 59 is provided outside the one end side of the reciprocating region of the carriage 61 in the main scanning direction X. In a standby state in which recording is not performed, the carriage 61 moves over the capping device 59 and stops, and the head surface of the recording head 62 is sealed by the cap CP provided in the capping device 59. The stop position of the carriage 61 is defined as a home position HP.

  Further, the ink jet recording apparatus 50 is provided with a transport driving roller 53 and a transport driven roller 54 as “recording material transport means” capable of transporting the recording paper P in the sub-scanning direction Y. The conveyance driving roller 53 rotates when the rotation driving force of the PF motor 58 (FIG. 3) is transmitted to the gear, and the recording paper P is conveyed in the sub-scanning direction Y by the rotation of the conveyance driving roller 53. A plurality of transport driven rollers 54 are provided and are individually urged by the transport driving roller 53, and the recording paper P is in contact with the recording paper P when the recording paper P is transported by the rotation of the transport driving roller 53. Rotates following the transport of A coating having a high frictional resistance is applied to the outer peripheral surface of the transport driving roller 53. The recording paper P pressed against the outer peripheral surface of the transport driving roller 53 by the transport driven roller 54 comes into close contact with the outer peripheral surface of the transport driving roller 53 by the frictional resistance of the outer peripheral surface, and rotates in the sub scanning direction by the transport driving roller 53. Conveyed to Y.

  On the upstream side of the conveyance drive roller 53 in the sub-scanning direction Y, a paper feed tray 57 as a “recording material stacking unit” capable of stacking a large number of recording sheets P is disposed. The paper feed tray 57 is configured to feed (feed) recording paper P such as plain paper or photo paper. In the vicinity of the paper feed tray 57, as the “automatic feeding means” for automatically feeding the uppermost recording paper P of the recording paper P stacked on the paper feed tray 57 to the “recording material conveying means”. An ASF (Auto Sheet Feeder) is provided. The ASF is a known automatic paper feed mechanism having a paper feed roller 57b provided on the paper feed tray 57 and a separation pad (not shown). The paper feed roller 57 b is disposed on one side of the paper feed tray 57. The recording paper guide 57a is provided on the paper feed tray 57 so as to be slidable in the width direction in accordance with the width of the recording paper P.

  Then, the recording paper P placed on the paper feed tray 57 is fed by the rotational driving force of the paper feed roller 57b that rotates by transmission of the rotational driving force of the PF motor 58 (FIG. 3). At that time, due to the frictional resistance of the separation pad, a plurality of recording papers P are not fed at a time, but only the uppermost recording paper P is accurately separated and automatically fed one by one. A paper detector 33 according to a known technique is disposed between the paper feed roller 57b and the conveyance drive roller 53.

On the other hand, a discharge driving roller 55 and a discharge driven roller 56 are provided as means for discharging the recording paper P after execution of recording. The paper discharge driving roller 55 is rotated by transmission of the rotational driving force of the PF motor 58 (FIG. 3), and the recording paper P after recording is discharged in the sub-scanning direction Y by the rotation of the paper discharge driving roller 55. Is done. The paper discharge driven roller 56 has a plurality of teeth around it, and is a toothed roller sharply sharpened so that the tip of each tooth makes point contact with the recording surface of the recording paper P. The plurality of paper discharge driven rollers 56 are individually urged by the paper discharge driving roller 55, and come into contact with the recording paper P when the recording paper P is discharged by the rotation of the paper discharge driving roller 55. The paper rotates as the paper is discharged.
A PF motor 58 (FIG. 3) that rotationally drives the paper feed roller 57b, the conveyance drive roller 53, and the paper discharge drive roller 55, and a CR motor 63 (FIG. 3) that drives the carriage 61 in the main scanning direction X are recorded. The drive is controlled by the control unit 100. Similarly, the recording head 62 is driven and controlled by the recording control unit 100 to eject ink onto the surface of the recording paper P. The recording control unit 100 forms dots by ejecting ink from the recording head 62 to the recording paper P based on the recording data while reciprocating the carriage 61 in the main scanning direction X, and the recording paper P in the sub-scanning direction. Control of recording on the recording paper P is executed while alternately repeating the operation of transporting to Y at a predetermined transport amount.

The recording control unit 100 as “recording control means” will be described with reference to FIGS.
The recording control unit 100 includes a ROM 101, a RAM 102, an ASIC (application specific integrated circuit) 103, an MPU 104, a nonvolatile memory 105 as a “nonvolatile storage medium”, a PF motor driver 106, a CR motor driver 107, and a head driver 108. ing. The MPU 104 includes a rotary encoder 31 as a “rotation amount detection unit” that detects the rotation amount of the transport driving roller 53 via the ASIC 103, and a linear encoder 32 as a “carriage movement amount detection unit” that detects the movement amount of the carriage 61. A paper detector 33 for detecting the leading and trailing edges of the conveyed recording paper P, a first PW sensor 341, a second PW sensor 342, and a power switch 35 for turning on / off the power of the ink jet recording apparatus 50, which will be described later. An output signal is input.

A known rotary encoder 31 includes a rotary scale 311 that rotates in conjunction with the rotation of the conveyance drive roller 53, and a rotary scale sensor 312 that detects slits formed at equal intervals along the outer periphery of the rotary scale 311. (FIG. 2). An output signal of the rotary scale sensor 312 that changes with the rotation of the transport driving roller 53 is output to the MPU 104 via the ASIC 103.
A known linear encoder 32 is mounted on a linear scale 321 disposed substantially parallel to the main scanning direction X in the vicinity of the carriage 61 and a carriage 61 that detects slits formed in the linear scale 321 at equal intervals. And a scale sensor 322 (FIG. 2). An output signal of the linear scale sensor 322 in which the period of the pulse corresponding to the amount of movement of the carriage 61 in the main scanning direction X changes with the moving speed is output to the MPU 104 via the ASIC 103.

The known paper detector 33 is given a self-returning behavior to a standing posture and protrudes into the conveyance path of the recording paper P so as to be able to rotate only in the conveyance direction (sub-scanning direction Y) of the recording paper P. This detector has a lever that is pivotally supported in the state, and the lever rotates when the tip of the lever is pushed by the recording paper P, whereby the recording paper P is detected (FIG. 2). . The paper detector 33 detects the start position of the recording paper P fed from the paper feed roller 57 b and the end position of the recording paper P being conveyed, and the detection signal is output to the MPU 104 via the ASIC 103.
A ROM 101, a RAM 102, an ASIC 103, an MPU 104, and a nonvolatile memory 105 are connected to the system bus of the recording control unit 100. The MPU 104 performs arithmetic processing for executing recording control of the ink jet recording apparatus 50 and other necessary arithmetic processing. The ROM 101 stores a recording control program (firmware) necessary for controlling the ink jet recording apparatus 50 by the MPU 104, and various data necessary for processing the recording control program is stored in the nonvolatile memory 105. . The RAM 102 is used as a work area for the MPU 104 and a storage area for recording data.

  The ASIC 103 has a control circuit for performing speed control of the PF motor 58 and the CR motor 63 which are DC motors and driving control of the recording head 62. Based on the control command sent from the MPU 104, the output signal of the rotary encoder 31 and the output signal of the linear encoder 32, various calculations for controlling the speed of the PF motor 58 and the CR motor 63 are performed, and based on the calculation results. A motor control signal is sent to the PF motor driver 106 and the CR motor driver 107. Further, based on the recording data sent from the MPU 104, a control signal for the recording head 62 is calculated and generated and sent to the head driver 108 to drive-control the recording head 62. The ASIC 103 has a host IF 112 as “information transmission means” for realizing information transmission with the personal computer 301 or the like as an “information processing apparatus”.

Subsequently, the first PW sensor 341 as the “first recording material detection unit”, the second PW sensor 342 as the “second recording material detection unit”, and the recording control unit 100 according to the present invention. The conveyance correction control will be described.
4 to 6 are plan views of the main part of the ink jet recording apparatus 50 showing the vicinity of the carriage 61 in an enlarged manner, and FIG. 4 shows that the front end in the transport direction of the recording paper P transported in the sub-scanning direction Y is the first PW. FIG. 5 shows a point when the leading end of the recording sheet P transported in the sub-scanning direction Y is detected by the second PW sensor 342, and FIG. 6 shows a recording sheet transported in the sub-scanning direction Y. Each of the points in time when the leading end in the transport direction of P reaches the recording start position is shown.

  The first PW sensor 341 and the second PW sensor 342 are arranged at a constant interval α in the sub-scanning direction Y at a portion facing the recording surface of the recording paper P of the carriage 61. The first PW sensor 341 and the second PW sensor 342 detect the edge of the recording paper P on the platen 52 from the difference between the light reflectance of the recording paper sliding surface of the platen 52 and the light reflectance of the recording surface of the recording paper P. An optical sensor that can be detected in a non-contact manner is provided, and the detection signal is output to the MPU 104 via the ASIC 103. Based on the output signals of the first PW sensor 341 and the second PW sensor 342, the recording control unit 100 transports the recording paper P transported in the sub-scanning direction Y by the rotation of the transport driving roller 53 (sub-scanning direction Y). The tip position of can be detected.

The recording control unit 100 first transports the recording paper P before recording execution in the sub-scanning direction Y prior to recording execution control on the recording paper P, and the leading end of the recording paper P in the transporting direction is detected by the first PW sensor 341. The conveyance control amount β from the detected time (FIG. 4) to the time (FIG. 5) detected by the second PW sensor 342 is acquired. Subsequently, from the relationship between the conveyance control amount β and the interval α, a conveyance correction value γ for correcting a deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording paper P is calculated from the following equation (1). .
Conveyance correction value γ = (conveyance control amount β−interval α) / interval α (1)
Since the first PW sensor 341 and the second PW sensor 342 are arranged with an interval α in the conveyance direction (sub-scanning direction Y) of the recording paper P, the recording paper P is conveyed from the first PW sensor 341 to the second PW sensor 342. In this case, the actual conveyance amount of the recording paper P is equal to the conveyance amount equal to the interval α. On the other hand, the transport control amount β at this time, specifically, the transport amount corresponding to the rotation amount of the transport driving roller 53 based on the output signal of the rotary encoder 31 should theoretically coincide with the interval α.

  However, for example, a transport error due to a shape error or eccentricity of the transport drive roller 53, a transport error due to a slip generated on a contact surface between the surface of the transported recording paper P and the outer peripheral surface of the transport drive roller 53, or the like. Therefore, the transport control amount β and the interval α at this time do not always match. Therefore, due to the difference between the conveyance control amount β and the interval α at this time, the actual conveyance amount of the recording paper P by the rotation of the conveyance drive roller 53 is deviated from the conveyance control amount from the recording control unit 100. Identify what will end up. From the difference between the conveyance control amount β and the interval α at this time, a conveyance correction value γ for correcting the deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording paper P is calculated by the above formula (1), for example. be able to.

  Then, the recording control unit 100 starts recording execution control on the recording paper P from the time when the leading end of the recording paper P in the conveyance direction reaches the recording start position (FIG. 6), and the recording paper P is moved by a predetermined conveyance amount. When transporting in the sub-scanning direction Y, transport correction of the recording paper P is performed based on the transport correction value γ. For example, when the interval α is 2 [inch] and the transport control amount β is 2.1 [inch], the transport correction value γ is 0.05, and from this, an extra 0.05 inch per 1 inch of transport amount It is only necessary to carry out conveyance correction such as carrying control.

  Thus, in the ink jet recording apparatus 50 according to the present invention, how much the actual conveyance amount of the recording paper P by the rotation of the conveyance driving roller 53 deviates from the conveyance control amount from the recording control unit 100. And a means for calculating the conveyance correction value γ is provided, so that a manufacturing process for individually storing a specific conveyance correction value in the manufacturing process becomes unnecessary. Therefore, the manufacturing process of the ink jet recording apparatus 50 can be simplified, and the storage capacity for holding a fixed conveyance correction value in a storage medium such as the ROM 101 and the nonvolatile memory 105 (FIG. 3) is reduced. Accordingly, the manufacturing cost of the ink jet recording apparatus 50 can be significantly reduced.

  In addition, the ink jet recording apparatus 50 according to the present invention can calculate the optimum transport correction value γ in the ink jet recording apparatus 50 at that time, either regularly or at any time, thereby performing transport driving. It is possible to flexibly cope with the secular change of the rollers 53 and the characteristics of the new type of recording paper P, and to perform recording while maintaining appropriate conveyance correction with high accuracy for a long period of time.

  Further, when recording on the recording paper P is performed, the conveyance correction value γ is calculated by the above procedure before starting recording, and recording on the recording paper P is being executed based on the calculated conveyance correction value γ. The conveyance correction may be executed. As a result, it is possible to set the conveyance correction value γ optimum for the type of the recording paper P that is always a recording execution target with high accuracy and execute the recording.

  Further, in the ink jet recording apparatus 50 according to the present invention, as in the embodiment, the first PW sensor 341 and the second PW sensor 342 perform sub-scanning of the recording paper P to a predetermined recording start position by the rotation of the transport driving roller 53. It is preferable that the front end of the recording paper P in the transport direction is detectable in the process of transporting in the direction Y. Accordingly, the conveyance of the recording paper P for determining the conveyance correction value γ and the conveyance of the recording paper P for arranging the recording paper P at the recording start position can be performed simultaneously. That is, when the recording paper P is transported to the recording start position, it is possible to make a state where the calculation of the optimal transport correction value γ for the recording paper P has already been completed. Accordingly, since the recording can be started immediately after the recording paper P is transported to the recording start position, the throughput during recording is hardly reduced by calculating the optimal transport correction value γ. Can be.

  Further, the ink jet recording apparatus 50 according to the present invention reciprocates the carriage 61 in the main scanning direction X, so that one or both of the first PW sensor 341 and the second PW sensor 342 are moved onto the platen 52 on the transport path. It is also possible to adopt a configuration capable of detecting both end positions of the recording paper P in the main scanning direction X. Accordingly, not only the leading end of the recording sheet P in the sub-scanning direction Y but also the positions of both ends of the recording sheet P in the main scanning direction X can be detected. The length of the paper P in the main scanning direction X and the position in the main scanning direction X can be detected. Accordingly, since it is possible to execute the recording by setting the recording execution positions in the main scanning direction X and the sub-scanning direction Y with respect to the recording paper P with higher accuracy, for example, a part of the recording image at the end of the recording paper P. It is possible to reduce the risk that the image is interrupted or the margin widths of the four sides become uneven.

  As described above, according to the ink jet recording apparatus 50 of the present invention, a manufacturing process for individually storing a specific conveyance correction value in the manufacturing process is unnecessary, and the “recording material conveying unit such as the conveyance driving roller 53” is used. Therefore, it is possible to flexibly cope with the change in the transport error accompanying the secular change and the characteristics of the new type of recording paper P, and to perform appropriate transport correction with high accuracy.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

1 is a schematic plan view of an ink jet recording apparatus according to the present invention. 1 is a schematic side view of an ink jet recording apparatus according to the present invention. 1 is a schematic block diagram of an ink jet recording apparatus according to the present invention. FIG. 3 is a plan view of a main part in the vicinity of a carriage of the ink jet recording apparatus. FIG. 3 is a plan view of a main part in the vicinity of a carriage of the ink jet recording apparatus. FIG. 3 is a plan view of a main part in the vicinity of a carriage of the ink jet recording apparatus.

Explanation of symbols

341 First PW sensor, 342 Second PW sensor, 50 Inkjet recording apparatus, 51 Carriage guide shaft, 52 Platen, 53 Conveyance driving roller, 54 Conveyance driven roller, 55 Discharged driving roller, 56 Discharged driven roller, 57 Paper feed tray 57b Paper feeding roller, 58 PF motor, 59 Capping device, 61 Carriage, 62 Recording head, 63 CR motor, 100 Recording control unit, 101 ROM, 102 RAM, 103 ASIC, 104 MPU, 105 Non-volatile memory, 106 PF motor Driver, 107 CR motor driver, 108 Head driver, P recording paper, X main scanning direction, Y sub-scanning direction

Claims (5)

A carriage mounted with a recording head and arranged to be reciprocable in the main scanning direction with respect to the recording material;
A recording material conveying means capable of conveying the recording material in the sub-scanning direction;
Control to form dots on the recording surface of the recording material based on recording data while reciprocating the carriage in the main scanning direction and transport the recording material in the sub-scanning direction by a predetermined transport amount by the recording material transporting means. A recording apparatus comprising a recording control means for executing control to perform recording on a recording surface of a recording material,
The carriage has a first recording material detection unit and a second recording material detection unit capable of detecting the end of the recording material in a non-contact manner at a portion facing the recording surface of the recording material conveyed by the recording material conveyance unit. And the recording material detection means of the recording material are arranged with an interval α in the sub-scanning direction,
The recording control means conveys the recording material before execution of recording in the sub-scanning direction, and the second recording material from the time when the leading end of the recording material in the conveyance direction is detected by the first recording material detection means. Transport for obtaining the transport control amount until it is detected by the recording material detection means, and correcting the deviation of the actual transport amount with respect to the transport control amount of the recording material from the relationship between the transport control amount and the interval α. A recording apparatus that calculates a correction value and corrects conveyance of a recording material based on the calculated conveyance correction value. 2. The recording control unit according to claim 1, wherein the recording control unit conveys the recording material before the recording in the sub-scanning direction before starting the recording each time recording is performed on the recording material. A conveyance control amount from the time when the first recording material detection unit detects the leading end in the conveyance direction to the time when the second recording material detection unit detects the conveyance control amount. The conveyance correction value for correcting the deviation amount of the actual conveyance amount with respect to the conveyance control amount of the recording material is calculated from the relationship between the recording material and the recording material during recording on the basis of the calculated conveyance correction value. A recording apparatus that performs conveyance correction. 3. The carriage according to claim 1, wherein the first recording material detection unit and the second recording material detection unit are configured to move the recording material to a predetermined recording start position by the recording material detection unit. A recording apparatus, wherein the recording material is disposed so as to be able to detect a leading end in a conveying direction of the recording material in a process of conveying in a scanning direction. 4. One or both of the first recording material detection unit and the second recording material detection unit according to claim 1, wherein the carriage is reciprocated in the main scanning direction. Therefore, the recording apparatus has a configuration capable of detecting both end positions in the main scanning direction of the recording material on the conveyance path by the recording material conveyance means. 5. The gap between the recording surface of the recording material and the head surface of the recording head is set at a predetermined interval while slidingly supporting the recording material conveyed by the recording material conveyance means. The platen specified in
The first recording material detection unit and the second recording material detection unit are configured to calculate the difference between the light reflectance of the recording material sliding surface of the platen and the light reflectance of the recording surface of the recording material. A recording apparatus comprising an optical sensor capable of detecting an end of a recording material on a platen in a non-contact manner.

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