JP2007083500A - Recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively correct a deviation of an image recording position caused by a behavior of a recording medium when the back end of the recording medium comes out from a pair of rollers on the upstream side in conveying the recording medium. <P>SOLUTION: Even when the recording media are excessively conveyed, in accordance with the amount of conveyance of the recording media detected by a means for detecting the amount of conveyance, among a plurality of recording elements of a recording head, a range for use of the recording element is shifted by using the recording element which is not used for recording. As the deviation of the position of the recording element to the recording medium is corrected thereby, it is prevented that the position of the recording image or the like is deviated from the recording position until that time. In addition, by using a selected value based on a corrected value selecting pattern of the amount of conveyance selected by a user as the corrected value, a correction of the deviation of the position to the recording medium is performed. It is possible to decrease the deviation of the position of the ink dot of the recorded image or the like based on the difference in accuracy of constitutional components of the recording apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording apparatus such as a printer, a copying machine, and a facsimile, and more particularly to correction of a recorded image position deviation caused by a recording sheet conveyance error.

  Conventionally, in a recording apparatus such as a printer, a copying machine, and a facsimile, as a mechanism for conveying a recording sheet as a recording medium, a conveying roller or a pinch roller that generates a conveying force by pressing and sandwiching the recording sheet against the conveying roller, Further, a mechanism including a means for generating an urging force for pressing the pinch roller is provided. This transport mechanism transports a recording sheet fed from a paper feed unit in a recording area by a recording head. Generally, two pairs are provided before and after the recording area. Accordingly, the recording sheet can be conveyed with high accuracy in the recording area, and a predetermined tension can be applied to the recording sheet during this period to keep a wide area flat. In FIG. 4, the recording head 7 mounted on the carriage unit 5 scans in a direction perpendicular to the paper surface, and can perform recording by ejecting ink during the scanning. With respect to the recording area of the recording head, the recording sheet is conveyed substantially horizontally from the right side to the left side in FIG. That is, with respect to the recording area, on the upstream side and downstream side of the recording sheet conveyance, there are a pair of a conveyance roller (hereinafter also referred to as LF roller) 36 and a pinch roller 37, and a pair of a discharge roller 41 and a spur 42, respectively. The two pairs of transport mechanisms described above are provided. Among these, the pinch roller 37 is rotatably supported by a rotation shaft provided in the pinch roller holder 30, and the pinch roller holder 30 is urged by a pinch roller spring 31, whereby the pinch roller 37 is moved to the transport roller 37. It can be pressed against. A pressing force is similarly applied between the paper discharge roller 41 and the spur 42 by a pressing mechanism (not shown). The recording sheet is sandwiched between these two pairs of rollers, and the conveyance roller 36 and the discharge roller 41 are driven to rotate by a drive mechanism (not shown), so that the recording sheet is scanned for each scan of the recording head. Are conveyed by a predetermined amount.

  However, in the conveyance mechanism as described above, the recording sheet is conveyed more than the intended predetermined conveyance amount when the trailing end of the conveyance of the recording sheet comes out of the nipping by the conveyance roller 36 and the pinch roller 37. In some cases, the relative position of the recording head with respect to the recording sheet is known to deviate from the normal position. As a result, the position (image position) of the ink dots formed on the recording sheet is displaced by the ink ejection from the recording head, and the quality of the recorded image is impaired.

In order to improve the position (image position) deviation of the ink dots, as described in Japanese Patent Application Laid-Open No. 2004-133867, in the recording medium conveyance by the conveyance unit, the recording head is selected according to the conveyance amount of the recording medium detected by the conveyance amount detection unit. In the plurality of recording elements, the unused recording elements that are not used for recording are used to shift the use range of the recording elements, thereby correcting the misalignment of the recording elements with respect to the recording medium by transporting the detected transport amount. There is a correction method.
JP-A-7-81190

  However, with only the correction method disclosed in Patent Document 1, improvement in ink dot position (image position) deviation is not always optimally performed due to differences in accuracy among the components of the printing apparatus. The present invention has been made to solve the above-described problems, and an object of the present invention is to record an image due to the behavior of the recording sheet when the trailing end of the recording sheet is removed from the upstream roller pair. It is an object of the present invention to provide a test printing method and a recording apparatus in which the positional deviation is optimized for each recording apparatus.

  Therefore, in the present invention, in a recording apparatus that uses a recording head in which a plurality of recording elements are arranged and performs recording on a recording medium, a conveying roller and an urging unit that applies a pressing force that presses the recording medium to the conveying roller are provided. A conveyance unit that conveys the recording medium; a conveyance amount detection unit that detects a conveyance amount of the recording medium by detecting a rotation amount of the conveyance roller; and the conveyance unit in the conveyance of the recording medium by the conveyance unit. According to the amount of conveyance of the recording medium detected by the amount detection means, the detected conveyance is shifted by using an unused recording element that is not used for recording among a plurality of recording elements in the recording head. Correction means for correcting the positional deviation of the recording element with respect to the recording medium due to the conveyance of the amount, and a correction value for the conveyance amount of the recording medium detected by the conveyance amount detection means. A means for carrying by adding to the carry amount and a carry amount correction value selection pattern printing, and a carry amount correction value having a value selected from the carry amount correction value selection pattern printing as a carry amount correction value. And a unit of transport amount to be corrected is smaller than the pitch (resolution) of the nozzle to be shifted. According to the above configuration, in the conveyance of the recording medium, the pressing force of the urging means that presses the recording medium against the conveyance roller in order to generate the conveyance force is not applied, that is, the recording medium is conveyed to the conveyance roller. Even if the recording medium is transported excessively due to the removal from between the urging means and the urging means, a plurality of recording heads in the recording head are detected according to the transport amount of the recording medium detected by the transport amount detecting means at that time. Of the recording elements, the unused recording elements that are not used for recording are used to shift the use range of the recording elements, thereby correcting the positional deviation of the recording elements with respect to the recording medium due to the extra conveyance, and the recorded images, etc. The position of the recording medium is prevented from shifting from the previous recording position, and the position selected by the user from the correction value selection pattern printing of the carry amount is used as the correction value. Correcting, by performing the position of the image or the like to be recorded, thereby reducing the position (image position) deviation of the ink dots different in accuracy of differences in the components of the recording apparatus.

  As described above, according to the present invention, even if the recording medium is transported excessively during the transport of the recording medium, a plurality of the recording heads according to the transport amount of the recording medium detected by the transport amount detection means at that time. In this recording element, an unused recording element that is not used for recording is used to shift the use range of the recording element, thereby correcting the positional deviation of the recording element with respect to the recording medium due to the extra conveyance. By preventing the position of the image or the like from deviating from the previous recording position, and correcting the positional deviation with respect to the recording medium by using the value selected by the user from the correction value selection pattern printing of the conveyance amount as the correction value, It is possible to reduce the displacement of the ink dot position (image position) where the position of the recorded image or the like differs due to the difference in accuracy in the components of the recording apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
The recording apparatus of the present embodiment is equipped with an automatic paper feeder, and the recording apparatus in the mounted state generally has a mechanism unit including a paper feeder, a paper feeding unit, a paper ejection unit, a carriage unit, and a cleaning unit. Is. In addition to these mechanism units, a control unit that controls the operation of each mechanism unit described below and performs processing related to recording data is provided in the form of a substrate. The control unit includes a CPU, a ROM, a RAM, and the like, similar to a known recording apparatus. Further, the recording head used in the recording apparatus is of an ink jet type, and among them, bubbles are generated in the ink using the thermal energy generated by the electric heating element, and the ink is ejected by the pressure of the bubbles. A so-called bubble jet (registered trademark) system (hereinafter referred to as BJ system) is adopted.

  The mechanism is shown in FIGS. 3 to 6. FIG. 3 is a plan view of the recording apparatus, FIG. 4 is a side view thereof, and FIG. 5 is a cross-sectional view thereof. In the following, each of the mechanism units will be described first with reference to the cross-sectional view of the recording apparatus shown in FIG.

(A) Paper feed unit (paper feed device)
In FIG. 4, the paper feeding unit 2 is configured by mounting an automatic paper feeding device on the recording apparatus main body. The automatic paper feeder has a base 20, and a pressure plate 21 for stacking recording sheets and a paper feed roller 28 for feeding the recording sheets are attached to the base 20. The sheet feeding roller 28 has a D-shape with a section cut in a circular shape. A movable side guide 23 is movably provided on the pressure plate 21, and the stacking position of the recording sheets can be regulated. The pressure plate 21 is provided so as to be rotatable about a rotation shaft formed on the base 20, and the stacked recording sheets can be urged toward the paper feed roller 28 by the urging force of the pressure plate spring 212. A separation pad 213 made of a material having a large friction coefficient, such as an artificial skin, is provided at portions of the pressure plate 21 and the movable side guide 23 facing the sheet feeding roller 28 to prevent double feeding of recording sheets. 4) and 234 are provided.

  In addition, a separation pad holder 24 provided with a separation pad 241 for separating recording sheets one by one is provided on the base 20 so as to be rotatable about a rotation axis provided on the base 20, and is separated by a separation pad spring 242. It is biased toward the paper feed roller 28. In addition, a rotating roller holder 25 to which a rotating roller 251 is attached is urged against the separation pad holder 24 by a urging force of a rotating roller spring 252 in a direction opposite to the urging direction.

  The automatic paper feeder is provided with a release cam gear 299 (see FIG. 4) for releasing the contact between the pressure plate 21 (or a recording sheet described therein) and the paper feed roller 28. The rotation of the gear is set so that the cut portion 285 of the paper feed roller 28 faces the separation pad 241 when the pressure plate 21 is lowered to a predetermined position. A predetermined space can be formed between 241 and the paper feed roller 28. At this time, the rotating roller 251 is in contact with the separation pad 241 to prevent double feeding of recording sheets.

  As described above, in the standby state, the release cam gear 299 pushes the pressure plate 21 down to a predetermined position, whereby contact between the pressure plate 21 and the paper feed roller 28 and contact between the separation pad 241 and the paper feed roller 28 are prevented. Canceled. In this state, when a driving force for driving a conveyance roller 36 of the paper feeding unit 3 to be described later is transmitted to the paper feeding roller 28 and the release cam 299 via a gear or the like, the release cam 299 is moved to the pressure plate. Thus, the pressure plate 21 is raised and the sheet feeding roller 28 and the recording sheet come into contact with each other. The recording sheet is picked up by the rotation of the sheet feeding roller 28 and separated one by one by the separation pad 241. To the paper feeding unit 3. When the recording sheet is fed into the paper feeding unit 3, the contact between the paper feeding roller 28, the pressure plate 21, and the separation pad 241 is released by the release cam gear 299. Further, when the recording on the recording sheet is completed and the paper discharge is completed, the return lever 26 acts on the recording sheet that has entered the separation pad 241, and the recording sheet can be returned to the stacking position on the pressure plate 21. .

  As for the driving of the return lever 26 and the paper feeding roller 28, the driving force of the conveying roller 36 is transmitted via a predetermined gear. The switching of the driving force transmission is performed by a solenoid 271, a solenoid spring 272, a solenoid pin 273, and a planetary gear arm 274 of the drive switching unit 27 (see FIG. 4). That is, when the solenoid pin 273 acts on the planetary gear arm 274 and restricts the movement of the planetary gear arm 274, the driving force of the transport roller 36 is not transmitted. On the other hand, when the solenoid pin 273 is separated from the planetary gear arm 274, the planetary gear arm 274 becomes free, and the driving force is transmitted to the return lever 26 and the paper feeding roller 28 in accordance with the forward rotation or reverse rotation of the transport roller 36. Is done.

(B) Paper-feeding section Each element constituting the paper-feeding section 3 is attached to a chassis 8 (see FIG. 4) made of a bent metal plate that constitutes a structural member of the recording apparatus main body. That is, in order to convey the recording sheet, the sheet feeding unit 3 includes a pair of a conveyance roller 36 and a pinch roller 37 provided on the upstream side in the conveyance direction with respect to a recording area by the recording head, and a discharge roller 41 provided on the downstream side. A pair with a spur 42 is configured. The transport roller 36 is formed by coating the surface of a metal shaft with ceramic particles and the like, and the shafts at both ends thereof are formed by two bearings 38 (see FIG. 3, the other is not shown) provided on both sides of the chassis 8. It has been deprecated.

  The transport roller 36 is provided with a plurality of driven pinch rollers 37 so as to be in contact with each other. The pinch roller 37 is held by a pinch roller holder 30, and the holder is biased by a pinch roller spring 31. The pinch roller 37 is in pressure contact with the conveying roller 36, thereby generating a recording sheet conveying force. At this time, the rotation shaft of the pinch roller holder 30 is attached to the bearing of the upper guide 33 provided in the chassis 8, and the pinch roller holder 30 rotates around this shaft. The pinch roller holder 30 is integrally formed. The pinch roller holder 30 has a certain level of rigidity in the recording sheet conveyance direction. On the other hand, by setting the rigidity in the direction perpendicular to the pinch roller holder 30 to be relatively small, the urging force of the pinch roller spring 31 is reduced. The pinch roller 37 is appropriately operated. Further, as described above, all the pinch rollers 37 are configured substantially parallel to the rotation axis of the transport roller 36 (see FIG. 5). The pinch roller holder 30 and the upper guide 33 also serve as a recording sheet guide. Further, a platen 34 for guiding the recording sheet is disposed at the entrance of the paper feeding unit 3 from which the recording sheet is conveyed from the paper feeding unit 2 described above. The upper guide 33 is provided with a PE sensor lever 35 for operating a PE sensor 32 for detecting the leading edge and the trailing edge of the recording sheet. The platen 34 is attached to the chassis 8 and positioned. The pinch roller 37 of the present embodiment is formed of a resin having good slidability such as POM, and the outer diameter is set to about 3 to 7 mm.

  A paper presser (not shown) that covers the end of the recording sheet is provided on the paper reference side of the platen 34. As a result, even when the end portion of the recording sheet is deformed or curled, the end portion is prevented from rising and interfering with the carriage 50 or the recording head 7.

  Above the paper feeding unit 2, a carriage unit 5 to be described later is configured. A recording head 7 is mounted on the carriage unit, and the scanning roller 7 and the pair of pinch rollers 37 are ejected by scanning. Recording can be performed by ejecting ink onto a recording sheet conveyed by a pair of paper roller 41 and spur 42. In this recording operation, the recording sheet sent to the paper feeding unit 3 is guided to the platen 34, the pinch roller holder 30, and the upper guide 33, and is sent to the roller pair of the conveyance roller 36 and the pinch roller 37. At this time, the PE sensor lever 35 is operated by the leading edge of the conveyed recording sheet, thereby detecting the leading edge of the recording sheet by the PE sensor. Based on the detection result, the recording position with respect to the recording sheet can be determined. The recording sheet is conveyed on the platen 34 by the rotation of the roller pairs 36 and 37 driven by the LF motor 88. The conveying roller 36 has an encoder wheel 361 for detecting the rotation position (see FIG. 3) is attached. The encoder wheel 361 is a disk-shaped transparent sheet on which radial markings are formed at a predetermined pitch, and the optical encoder sensor 362 (see FIG. 3) fixed to the chassis 8 By detecting, the rotation position or rotation amount of the conveying roller 36 can be known.

  As described above, the carriage unit 5 is provided with the recording head 7 and ink tanks for supplying black and color inks to the carriage unit 5 individually and detachably with respect to the carriage. Has been. As described above, the recording head 7 applies heat to the ink by the heater, the ink causes film boiling due to the heat, and the pressure from the nozzles of the recording head 7 is changed by the pressure change caused by the growth or contraction of the bubbles due to the film boiling. Is discharged and an image is recorded on the recording sheet. In the recording head 7 for each color ink, the nozzles constituting the recording elements are arranged in parallel with the recording sheet conveyance direction, and according to the setting of the unused nozzles and the recording sheet conveyance error using it. Correction can be performed.

(C) Carriage unit The carriage unit 5 includes a carriage 50 to which the recording head 7 is attached. The carriage 50 holds a guide shaft 81 (see FIG. 3) extending in a direction perpendicular to the recording sheet conveyance direction and the rear end of the carriage 50 to maintain a gap between the recording head 7 and the recording sheet. Are supported by a guide rail 82 (see FIG. 3) extending in the same manner.

  The carriage 50 is driven by a carriage motor 80 (see FIG. 3) attached to the chassis 8 via a timing belt 83 (see FIG. 3). The timing belt 83 is stretched and supported by an idle pulley 84 (see FIG. 3). Furthermore, the carriage 50 includes a flexible substrate 56 (see FIG. 3) for transmitting a recording signal and the like from the electric substrate 9 constituting the above-described control unit to the recording head 7.

  In the above configuration, when recording on the recording sheet, the roller pair 36 and 37 conveys the recording sheet to the recording row position (position in the recording sheet conveyance direction) and the column position where the carriage 50 records the carriage 50. The recording head 7 is scanned by moving to (position in a direction perpendicular to the recording sheet conveyance direction). During this scanning, the recording head 7 can be driven based on the recording signal from the control unit to eject ink onto the recording sheet, thereby recording an image or the like.

(D) Paper discharge unit A pair of paper discharge rollers and spurs in the paper feed unit constitutes a paper discharge unit. That is, the spur base 341 (see FIG. 3) corresponding to the paper discharge roller 41 is rotatably provided with a spur 42 and is in contact with the paper discharge roller 41. The discharge roller 41 can be driven by transmitting a driving force for the conveying roller 36 by the transmission roller 40.

  The paper discharge roller 41 is configured by arranging a plurality of roller portions made of a high friction material such as rubber on a shaft made of metal or resin (see FIG. 3). Further, the spur 42 has a thickness of about 0.1 mm, and has a resin portion made of POM that has a protrusion on its outer periphery and forms a rotating bearing with a metal plate such as SUS (stainless steel).

  The transmission roller 40 for transmitting the driving of the paper discharge roller 41 has a disk-shaped roller such as POM and a low hardness, high friction material such as styrene elastomer attached to the outer periphery thereof. Further, both the conveying roller 36 and the paper discharge roller 41 are in contact with each other with a predetermined pressure, whereby the driving force can be transmitted.

  With the above configuration, the recording sheet on which recording is performed by scanning the recording head of the carriage unit 5 is conveyed by being sandwiched between the nip between the discharge roller 41 and the spur 42 and discharged onto a discharge tray or the like. In the conveyance, the recording sheet is nipped between the discharge roller 41 and the spur 42 of the sheet discharge portion after the trailing end is separated from the conveyance roller 36 and the pinch roller 37, and is recorded or discharged. Is done. In addition, the spur 42 is configured to be able to remove ink or the like attached to the spur 42 by contacting a spur cleaner 43.

(E) Cleaning unit The cleaning unit 6 (see FIGS. 3 and 4) is for suppressing the drying of ink in each nozzle of the recording head 7 and a pump (not shown) that performs the ejection recovery process of the recording head 7. It has a cap (not shown).

  FIG. 6 is a diagram illustrating details of a detection mechanism that detects the rotation position or rotation amount of the transport roller 36.

  As described above, the encoder wheel 361 is attached to the rotation shaft of the transport roller 36. Specifically, the encoder wheel 361 can be centered by being press-fitted into the rotation shaft of the transport roller 36, and the strength of the encoder wheel 361 can be increased by bonding to the LF pulley 364. The encoder wheel 361 is a disk-shaped transparent sheet as shown in the figure, and radial markings are formed on the transparent sheet at a predetermined pitch. A fixed optical encoder sensor 362 is provided for the encoder wheel, and by detecting the marking on the encoder wheel 361, the rotation position or rotation amount of the transport roller 36 can be known. That is, each time the mark on the encoder wheel 361 reaches the position of the encoder sensor 362 as the transport roller 36 rotates, a detection signal is generated, and this signal is sent to the control unit described above. The control unit can know the rotation position or rotation amount of the transport roller 36 by counting the number of signals from a predetermined reference rotation position. This rotation amount detection can be used for image position correction processing.

  The transport roller 36 can be driven by transmitting the driving force of the LF motor 88 via the LF belt 363 as shown in FIG. That is, the transmission can be performed by attaching the LF belt 363 to the LF pulley 364 attached to the LF motor pulley 881 attached to the LF motor 88 and the conveying roller 36 with a predetermined tension. FIG. 6 also shows a configuration in which the driving force of the transport roller 36 is transmitted to the paper discharge roller via the transmission roller 40 described above.

  The recording operation, particularly the image position correction, in the recording apparatus of the present embodiment described above will be described. In the present embodiment, a so-called multi-pass printing is performed in which a print area printed by the scan of the print head is printed by a plurality of scans, and the nozzles used for printing are different for each scan. When the recording sheet reaches the “pinch roller removal position” that is a position where the recording sheet is removed from the nipping by the conveying roller and the pinch roller (the position where the trailing edge of the recording sheet is separated from the roller pair 36 and 37), When it is detected that more than the amount is conveyed, the recording is performed after the nozzle shift.

  Before performing the nozzle shift, a part of the usable nozzles of the recording head 7 is limited as an unused part. In this embodiment, half of the nozzles are used as unused portions, and the remaining half of the nozzles are used for recording. When 4-pass printing is performed in this usage range, the conveyance amount of the recording sheet at one time is 1/8 of the entire nozzle range length.

  During the four-pass recording, when the trailing edge of the recording sheet passes through the conveying roller 36 and the pinch roller 37, the conveying roller 36 rotates more than a predetermined amount by the pressing pressure of the pinch roller 37 as described above. Sometimes. When this is detected by the encoder wheel 361 and the encoder sensor 362, an excessive amount of rotation of the conveying roller 36 at that time is detected, and a correction amount is detected based on the detected amount of rotation, and the unused portion of the nozzles of the recording head 7 is used. The nozzle used is shifted by an amount corresponding to the excessive amount of rotation. As a result, the nozzle used by the recording head is also shifted by an amount corresponding to the recording sheet transported by an excessive amount, so that the image position recorded on the recording sheet deviates from the image recorded by the previous scanning. Can be prevented. By using the value selected by the user from the correction value selection pattern printing of the carry amount as the correction value, the position of the ink dot, etc., where the position of the recorded image or the like differs due to the difference in accuracy in the components of the recording apparatus (image Position) can be prevented from shifting. The value selected by the user from the conveyance amount correction value selection pattern printing is obtained from the operation of the flowchart shown in FIG. 1 showing the conveyance amount correction value selection pattern printing and the conveyance amount correction value detection operation. First, in step S101, a conveyance amount correction value selection pattern is printed. Printing may be performed by a command from the host PC, or may be activated from the recording apparatus side if there is a means for performing a printing operation of the conveyance amount correction value selection pattern on the recording apparatus side. The carry amount correction value selection pattern is a test print that passes the pinch roller missing position at least a plurality of times, and the correction value selection pattern changes the carry amount correction value and passes the drawing position to the previous position every time paper is passed. Print in order at positions that do not overlap the pattern. (See FIG. 2) Subsequently, the process proceeds to step S102 to determine whether or not a correction value selection pattern number has been selected. The correction value selection pattern number may be selected from an application on the host PC, or may be selected on the recording apparatus side if number selection means is provided on the recording apparatus side. In step S103, the correction value selection pattern number is stored and the process ends. The transport amount correction value detection operation described above may be performed for each paper type, and the correction value selection pattern number in step S103 may be stored for each paper type. If no number is selected in step S102, the process proceeds to step S104 to determine whether to interrupt the process. Processing interruption may be performed from the above application, or may be selected on the recording device side when processing interruption means is provided on the recording device side. If the process is not interrupted, the process returns to step S102. If the process is interrupted in step S104, the process ends.

  As described above, according to the present embodiment, even when there is a relative displacement between the recording head and the recording sheet due to the extra recording sheet being fed when the recording sheet is removed from the upstream roller pair, It is possible to perform good recording without recording deterioration such as positional deviation of recorded images.

  Each of the above embodiments has been described with respect to an example using an inkjet system, of which a so-called BJ system recording head, but the present invention can be applied regardless of the recording system of such a recording head. It is clear from the description of the form. As a recording method of the recording head, for example, a piezo method may be used in addition to the BJ method, and a recording head of a method in which recording elements are arranged in a recording head, such as a thermal transfer method, is used instead of an ink jet method. Can do.

It is a flowchart which shows conveyance amount correction value selection pattern printing and conveyance amount correction value detection operation | movement in the 1st Embodiment of this invention. It is explanatory drawing of the conveyance amount correction value selection pattern in the 1st Embodiment of this invention. 1 is a plan view of a recording apparatus according to a first embodiment of the present invention. It is a side view of the recording apparatus. It is a cross-sectional view of the recording apparatus. FIG. 4 is a diagram illustrating a mechanism for mainly detecting a rotation amount of a conveyance roller in the recording apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Paper feeder 3 Paper feeding part 4 Paper discharge part 5 Carriage part 6 Cleaning part 7 Recording head 8 Chassis 9 Electric board 20 Base 21 Pressure plate 212 Pressure plate spring 213 Separation sheet (pressure plate side)
23 Movable side guide 234 Separation sheet (movable side guide side)
24 Separation pad holder 241 Separation pad 242 Separation pad spring 25 Rotation roller holder 251 Rotation roller 252 Rotation roller spring 26 Return lever 27 Drive switching unit 271 Solenoid 272 Solenoid spring 273 Solenoid pin 274 Planetary gear arm 28 Feed roller 285 Feed roller notch 30 Pinch Roller holder 31 Pinch roller spring 32 PE sensor 33 Upper guide 34 Platen 341 Spur mount 35 PE sensor lever 36 Conveying roller 361 Encoder wheel 362 Encoder sensor 363 LF belt 364 LF pulley 365 LF gear 37 Pinch roller 40 Transmission roller 41 Discharge roller 411 Paper discharge roller gear 42 Spur 50 Carriage 56 Flexible substrate 80 Carriage motor 8 8 LF motor 299 release cam gear

Claims (7)

In a recording apparatus for recording on a recording medium using a recording head in which a plurality of recording elements are arranged,
A conveying unit that includes a conveying roller and an urging unit that applies a pressing force to press the recording medium against the conveying roller, and conveys the recording medium;
A conveyance amount detecting means for detecting a conveyance amount of the recording medium by detecting a rotation amount of the conveyance roller;
In the conveyance of the recording medium by the conveyance means, a recording element using an unused recording element that is not used for recording among a plurality of recording elements in the recording head according to the conveyance amount of the recording medium detected by the conveyance amount detection means. Correction means for correcting the positional deviation of the recording element with respect to the recording medium by shifting the detected conveyance amount by shifting the use range of
A conveyance amount correction unit that performs conveyance by adding a correction value to the conveyance amount with respect to the conveyance amount of the recording medium detected by the conveyance amount detection unit;
Means for carrying a correction value selection pattern printing of the carry amount;
A conveyance amount correction value selection unit that uses a value selected from the correction value selection pattern printing of the conveyance amount as a correction value for the conveyance amount is provided, and the unit of the conveyance amount to be corrected is smaller than the pitch (resolution) of the nozzle to be shifted. A recording apparatus.   The recording apparatus according to claim 1, wherein the transport amount correction value selection unit that uses the transport amount correction value includes a unit that transfers data from a host PC.   2. A recording apparatus according to claim 1, wherein said conveyance amount correction value selection means for making said conveyance amount correction value comprises means for performing from a recording apparatus.   The recording apparatus according to claim 1, further comprising means for selecting the correction value for the carry amount according to a type of the recording medium.   The recording apparatus according to claim 1, wherein the conveyance amount correction value selection pattern passes the pinch roller missing position at least a plurality of times.   5. The recording apparatus according to claim 1, wherein the carry amount correction value selection pattern changes the carry amount correction value each time a sheet is passed.   5. The recording apparatus according to claim 1, further comprising means for selecting the conveyance amount correction value selection pattern printing according to a type of the recording medium.

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