JP2006130857A - Recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control carrying of a recording medium with high accuracy in an all area after a front edge of the recording medium reaches an upstream side carrying means and until a rear end of the recording medium passes through a downstream side carrying means. <P>SOLUTION: In a recorder, the first carrying means 4 on the upstream side is provided with the first means to be detected 40, the second carrying means 7 on the downstream side is provided with the second means to be detected 41, sensing means 13 and 15 for sensing an edge of the recording medium on the upstream side of the first carrying means is provided, and one revolution amount detecting means 42 for selectively detecting the first and second means to be detected is provided. The printer controls the first carrying means on the basis of a detection signal of the first means to be detected by the revolution amount detecting means, and controls the second carrying means on the basis of a detection signal of the second means to be detected by the revolution amount detecting means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording apparatus for recording on a recording medium conveyed by a recording head based on recording information.

2. Description of the Related Art Recording devices that record images based on recording information are used as output devices for printers, facsimiles, copying machines, or various information processing systems. This recording apparatus can be classified into, for example, an ink jet recording apparatus, a thermal transfer recording apparatus, a thermal recording apparatus, a wire dot recording apparatus, and a laser beam recording apparatus, depending on the recording method of the recording head.
In the recording apparatus, the recording medium is fed from an automatic sheet feeding device in which a plurality of recording media are stacked on a tray, and the print area on the fed recording medium is in a direction perpendicular to the feeding direction. The image is recorded on the recording medium by a recording head mounted on a carriage supported so as to be reciprocally movable (in the case of an ink jet recording apparatus, ink is ejected from the recording head onto the recording medium). After the recording is finished, a predetermined amount of pitch is conveyed, and this is repeated until the image data is finished, thereby recording on the recording medium.

  FIG. 7 is a schematic perspective view showing a schematic configuration of a transport system of a conventional recording apparatus, and FIG. 8 is a schematic side view showing a drive mechanism of the transport system of FIG. 7 and 8, reference numeral 1 denotes an automatic paper feeder. A recording medium loaded on a pressure plate 3 spring-biased with respect to the paper feed roller 2 is fed by a paper feed roller 2 that rotates in response to a paper feed command. Are separated one by one and conveyed to the recording unit. Reference numeral 4 denotes a conveying roller for conveying the recording medium, and 5 (5a to 5d) are pinch rollers pressed against the conveying roller 4 by a spring 23 (23a to 23e) via a pinch roller holder 22; Is held between the transport roller 4 and the pinch roller 5 and transported by a specified feed amount.

  On the downstream side of the recording unit, the paper is nipped by a paper discharge roller 7 and a spur (not shown), and the recording medium is supplementarily conveyed by the drive transmitted from the conveying roller 4. Reference numeral 8 denotes a platen that forms a recording medium conveyance surface. On the upper side of the platen 8, a carriage (not shown) that mounts a recording head (not shown) and moves in a direction perpendicular to the recording medium conveyance direction is disposed. Therefore, image recording is performed on the recording medium conveyed along the supporting surface of the platen 8 by the conveying roller 4 based on the recording data. The recorded recording medium is discharged out of the apparatus main body by a pair of rollers including a discharge roller 7 and a spur (not shown) disposed on the downstream side in the conveyance direction of the platen 8.

  In FIG. 8, reference numeral 21 denotes a conveyance motor that drives the conveyance roller 4, and the drive is transmitted to the conveyance roller 4 by a belt 30. Reference numeral 31 denotes an encoder wheel fixed on the axis of the conveying roller 4, and an area that transmits light and a light-shielding area are provided on the circumference at a predetermined pitch. On the other hand, an encoder sensor 32 is fixed on the chassis 12 or the base 20. The encoder sensor 32 including the light emitting unit and the light receiving unit can detect the rotation amount and the rotation speed of the transport roller 4 by reading a signal through which the sensor light passes through the encoder wheel 31.

Reference numeral 33 denotes an idler gear, which transmits a drive from a conveyance roller gear (not shown) press-fitted on the axis of the conveyance roller 4 to a discharge roller gear 34 press-fitted on the axis of the discharge roller 7. As described above, the conveyance amount control of the conveyance roller 4 and the discharge roller 7 is performed by reading the slit of the encoder wheel 31 arranged on the same axis of the conveyance roller 4 by the encoder sensor 32 and based on the read encoder signal. 21 is performed by closed-loop control. Japanese Patent Application Laid-Open No. 2002-13749 discloses a control for accurately stopping the DC motor by a code wheel disposed on the conveyance roller shaft. Japanese Patent Application Laid-Open No. 2002-361958 discloses that an encoder wheel is provided on a shaft of a paper discharge roller which is a downstream conveyance roller to control the conveyance amount.
JP 2002-13749 A JP 2002-361958 A

  In the conventional transport device, while the recording medium is transported by the transport roller, it can be transported with high accuracy by controlling the transport motor in accordance with the signal from the encoder sensor. After passing through the roller, the recording medium is conveyed by a pair of a discharge roller and a spur, and it is difficult to accurately grasp the conveyance behavior of the recording medium with the encoder wheel on the conveyance roller. there were.

  The reason is that the drive transmission from the conveyance roller to the discharge roller is performed via an idler gear or a drive transmission belt, so the control conveyance amount at the conveyance roller and the conveyance amount at the discharge roller do not correspond with a certain correlation. Because. Further, in order to suppress the occurrence of scratches on the image recorded on the recording medium and to prevent the transfer of the ink of the recorded image, the spur pressure contact force for generating the transport force by the paper discharge roller is the transport force by the transport roller. In general, the pressure is set to be weaker than the pressure contact force of the pinch roller for generating, and one of the reasons is that slippage or the like is likely to occur between the recording medium and the paper discharge roller.

  Furthermore, since the pinch roller moves by the thickness of the recording medium when the trailing end of the recording medium comes out of the pressure roller between the conveying roller and the pinch roller, the recording medium is pushed out at that moment and the conveying amount is temporarily increased. The fluctuation is one of the causes of the fluctuation of the correlation between the conveyance amounts of the conveyance roller and the discharge roller. As described above, there is a problem that it is difficult to ensure the conveyance accuracy in the rear end region of the recording medium only by the signal from the encoder wheel on the conveyance roller shaft.

  Japanese Patent Laid-Open No. 2002-361958 discloses that an encoder wheel is not provided on the shaft of the upstream conveying roller, but is provided on the shaft of a paper discharge roller which is a downstream conveying roller. However, in this case, the recording medium is transported by the transport roller from when printing on the recording medium is started until the leading edge of the recording medium is sandwiched between the paper discharge roller and the spur. Contrary to the above, there is an inconvenience that the conveyance accuracy of the recording medium in the meantime cannot be guaranteed. However, since the behavior of the recording medium can be detected when the trailing edge of the recording medium passes through the pressure-carrying portion between the conveying roller and the pinch roller, good results are obtained with respect to the conveying accuracy at the moment when the trailing edge of the recording medium comes off. It is possible to obtain.

  The present invention has been made in view of such technical problems, and an object of the present invention is to make the rear end of the recording medium downstream after the leading end of the recording medium is sandwiched by the upstream conveying means. It is an object of the present invention to provide a recording apparatus capable of controlling the conveyance of the recording medium with high accuracy in the entire area from the holding by the conveying means to the release.

  In order to achieve the above object, the present invention provides a recording apparatus for recording on a recording medium conveyed by a recording head on the basis of recording information, and a first conveying means disposed on the upstream side in the conveying direction of the recording head. , A second conveying means disposed downstream of the recording head in the conveying direction, a first rotation amount detected means provided in the first conveying means, and a second rotating means provided in the second conveying means. 2 rotation amount detection means, an end detection means for detecting an end of the recording medium at a position upstream of the first conveyance means in the conveyance direction, the first rotation amount detection means, and the second rotation detection means. A rotation amount detection means capable of selectively detecting the rotation amount detection means of the first rotation amount based on a detection signal of the first rotation amount detection means by the rotation amount detection means. And the second rotation amount covered by the rotation amount detecting means is controlled. And controlling said second conveying means based on a detection signal of the detecting means.

  According to the present invention, in the entire area from when the leading end of the recording medium is sandwiched by the upstream conveying unit to when the trailing end of the recording medium is released from the nipping by the downstream conveying unit, the recording medium There is provided a recording apparatus capable of controlling the conveyance of the image with high accuracy.

  Embodiments of the present invention will be specifically described below with reference to the drawings. Note that the same reference numerals denote the same or corresponding parts throughout the drawings. FIG. 6 is a schematic longitudinal sectional view showing the overall configuration of a recording apparatus suitable for applying the present invention. In FIG. 6, reference numeral 1 denotes an automatic paper feeder, and a recording medium such as a recording paper loaded on a pressure plate 3 spring-biased with respect to the paper feed roller 2 is a paper feed roller that rotates in response to a paper feed command. 2 are separated one by one and conveyed to the recording unit. 4 is a conveyance roller on the upstream side that conveys the recording medium, and 5 is a pinch roller that is pressed against the conveyance roller 4 by a spring via a pinch roller holder. The recording medium is sandwiched between the conveyance roller 4 and the pinch roller 5. Are transported.

  In the recording unit, a platen 8 for supporting the recording medium to be conveyed is arranged, and in a region facing the platen 8, a carriage 10 on which a recording head 9 is mounted is arranged along the guide shaft 11. It is guided and supported so as to be able to reciprocate in a direction orthogonal to the transport direction. The guide shaft 11 is integrally installed on the chassis 12. A discharge roller 7 for conveying the recording medium to the outside of the apparatus main body is disposed on the downstream side in the conveyance direction of the recording unit with respect to the conveyance roller 4 on the upstream side in the conveyance direction of the recording unit. A spur 6 for applying a conveying force is pressed against the paper discharge roller 7 so as to be driven to rotate. The paper discharge roller 7 and the spur 6 sandwich the recording medium on the downstream side of the recording unit, and supplementally convey the recording medium by driving transmitted from the conveyance roller 4 to the paper discharge roller 7.

  The upstream conveyance roller 4 is driven to rotate by the conveyance motor 21, and the rotation of the conveyance roller 4 is transmitted to the paper discharge roller 7, which is the downstream conveyance roller, via the idler gear 33. A paper edge sensor lever 13 is pivotally supported on the upstream side of the conveyance roller 4 in the conveyance direction so as to be swingable. A photo sensor 15 that is a paper edge sensor is disposed on the electric board 14 on the chassis 12. The paper edge sensor lever 13 detects the leading edge and the trailing edge of the recording medium, and rotates by contacting the recording medium. By detecting the rotation timing of the paper edge sensor lever 13 with the paper edge sensor 15, the positions of the front edge and the rear edge of the recording medium are detected.

  In FIG. 6, when recording data is sent from the host PC to the recording apparatus, the conveyance roller 21 is rotated by the rotation of the conveyance motor 21. The rotation of the conveying roller 4 is transmitted to the half-moon-shaped sheet feeding roller 2, and the recording media stacked on the pressure plate 3 are separated one by one by the rotation of the sheet feeding roller 2 and fed to the conveying roller 4. . The fed recording medium is intermittently conveyed on the platen 8 by the rotation of the conveying roller 4, and at this time, the recording head 9 is driven based on the recording data in synchronization with the movement of the carriage 10 (main scanning). As a result, recording on the stopped recording medium is performed. When the recording for one line is completed, the recording medium is pitched by a predetermined amount, and the recording of the next line is performed. Thereafter, by repeating this, recording is performed on the entire area of the recording medium. In this way, by rotating the transport roller 4 and the paper discharge roller 7 by the transport motor 21, the recording operation is finished by sending a predetermined amount from the timing when the trailing edge of the recording medium passes the paper end sensor lever 13.

  FIG. 1 is a schematic perspective view showing a main configuration of a recording apparatus according to the present invention, and FIG. 2 shows a state when a recording medium is conveyed by a conveyance roller of a conveyance drive control system of the recording apparatus according to the present invention. FIG. 3 is a schematic side view, FIG. 3 is a schematic side view showing a state when a recording medium is being conveyed by a discharge roller of the conveyance drive control system of FIG. 2, and FIG. 4 is a conveyance drive control of FIG. It is a typical top view of a system. 1 to 4, the recording medium stacked on the pressure plate 3 rotatably supported in the automatic paper feeder 1 is first fed by a paper feed roller 2 (FIG. 6) driven by a transport motor 21. The sheet is fed to a conveyance roller 4 that is one conveyance means, conveyed by the conveyance roller 4 along a platen 8 fixed to the chassis 12, and recorded by a recording head 9 disposed facing the platen 8. Thereafter, the sheet is discharged out of the apparatus main body by a discharge roller 7 which is a second conveying means.

  In FIG. 1 to FIG. 4, the encoder wheel 40 which is a first rotation amount detection means attached on the shaft of the transport roller 4 rotates integrally with the transport roller 4. The encoder wheel 41 as the second rotation amount detection means attached on the shaft of the paper discharge roller 7 rotates integrally with the paper discharge roller 7. The detection pattern of the first encoder wheel 40 and the detection pattern of the second encoder wheel 41 are detected by an encoder sensor 42 which is a common rotation amount detection means that can move to each detectable position. For example, an optical photosensor is used as the encoder sensor 42. Each of the first and second encoder wheels 40 and 41 is formed with a detection pattern such as a slit at a predetermined circumferential pitch. Then, the encoder sensor 42 selectively reads the detection pattern of the first and second encoder wheels 40 and 41 to detect the rotation amount and the rotation speed of the transport roller 4 and the discharge roller 7. It is configured.

  Next, the conveyance drive control system of the recording apparatus according to the present invention will be described with reference to FIGS. 2 to 4, the first encoder wheel 40 is integrally fixed to the shaft of the transport roller 4. A conveying force for conveying the recording medium is obtained by pressing the pinch roller 5 pivotally supported by a pinch roller holder (not shown) against the conveying roller 4 with a spring. The drive of the conveyance motor 21 is transmitted to the pulley portion of the conveyance roller gear 51 (FIG. 4) by the timing belt 30 through the pulley 50 (FIG. 4) press-fitted into the motor shaft.

  The conveyance motor 21 is connected to an electric circuit (not shown) of the recording apparatus. The conveyance motor 21 is feedback-controlled for the rotation amount and the rotation speed by a signal detected by the encoder sensor 42 in order to carry a predetermined amount based on the recording data from the host computer. A discharge roller gear 52 (FIG. 4) is fixed to the shaft of the discharge roller 7. The drive from the transport roller gear 51 is transmitted to the paper discharge roller gear 52 via the idler gear 33. A second encoder wheel 41 is integrally fixed to the shaft of the paper discharge roller 7. As shown in FIG. 4, spurs 6 (6a, 6b, 6c,...) Are arranged at a plurality of positions facing the paper discharge roller 7, and each spur 6 is pressed against the paper discharge roller 7 by a spring. . The spur 6 may be arranged for the purpose of controlling the behavior of the recording medium even in a portion where the paper discharge roller 7 is not provided.

  A recording head 9 that performs recording on a recording medium is mounted on a carriage 10 that is guided and supported so as to be able to reciprocate in a direction orthogonal to the conveyance direction of the recording medium. A recording operation unit including the recording head 9 and the carriage 10 is disposed between a conveying roller pair including the conveying roller 4 and the pinch roller 5 and a conveying roller pair including the discharge roller 7 and the spur 6. A paper edge sensor lever 13 for detecting the front and rear ends (paper edges) of the recording medium is disposed on the upstream side of the conveyance roller 4 in the conveyance direction so as to be swingable. The paper edge position (passing timing) of the recording medium is detected by a paper edge sensor 15 that is shielded by the movement of the paper edge sensor lever 13. These paper edge sensor lever 13 and paper edge sensor 15 constitute an edge detection means for detecting the front and rear edges of the recording medium on the upstream side of the first conveyance means 4 in the conveyance direction.

  The encoder sensor 42, which is a rotation amount detection means for reading the detection patterns of the encoder wheels 40, 41, which are the first and second rotation amount detection means, is provided on the encoder wheels 40, 41 at a predetermined pitch. By optically reading the pattern (slit pattern), the rotation amount and the rotation speed of the conveyance roller 4 as the first conveyance unit and the discharge roller 7 as the second conveyance unit are detected. A holder member 43 supports the encoder sensor 42. The holder member 43 is rotatably supported by the chassis 12 or the base 20 and is urged in one direction by a compression spring 45 stretched between the holder member 43 and the chassis 12. The holder member 43 is position-controlled at a predetermined rotational position against the compression spring 45 by the expansion and contraction of the terminal portion of the solenoid 44 that is a drive source.

  That is, the encoder sensor 42 on the holder member 43 is controlled by the first encoder wheel 40 by controlling (regulating) the rotation position of the holder member 43 against the compression spring 45 by the expansion and contraction movement of the solenoid 44 terminal portion. Alternatively, it is configured to move to one of the detection positions of the second encoder wheel 41 so that one encoder sensor 42 can selectively read one of the 20 encoder wheels 40, 41. Here, the position of the encoder sensor 42 is controlled by driving with a solenoid 44. This is because the encoder sensor 42 and the drive source such as a motor of an automatic paper feeder or another unit are used. You may comprise so that the position of the holder member 43 may be controlled. The movement of the encoder sensor 42 in that case may be a rotational movement or a parallel movement.

  FIG. 5 is a flowchart showing an operation sequence of the conveyance drive control system of the recording apparatus according to the embodiment of the invention. In FIG. 5, when there is a recording command from the host PC in step S101, recording data is created on the host PC side in step S102. The created recording data is transferred to the recording device via the I / F cable (step S103). The recording apparatus performs a paper feeding operation based on the recording data sent from the host PC (step S104). At the start of the paper feeding operation, the solenoid 44 is controlled so that the encoder sensor 42 is always at a position (FIG. 2) where the slit of the first encoder wheel 40 on the axis of the transport roller 4 can be read. . This setting is performed in advance by an initial operation performed after the end of the previous recording or before the current recording operation.

  The paper edge (leading edge) of the fed recording medium is detected by the paper edge sensor 15 at a position between the automatic paper feeder 1 and the pair of conveying rollers 4 and 5 (step S105). The recording medium whose leading edge is detected is transported by a predetermined amount to the recording head 9 by controlling the driving of the transport motor 21 based on the leading margin information from the host PC. Specifically, the encoder sensor 42 reads the number of passage slits and the passage speed of the first encoder wheel 40, thereby performing feedback control by the control circuit of the recording apparatus and controlling the rotation amount and the rotation speed of the transport roller 4. Is.

  At that time, a predetermined amount is conveyed according to the type and recording quality of the recording medium (step S106), and the recording head is synchronized with the recording medium main scan by the recording head 9 on the carriage 10 based on the recording data. 9 is driven to perform recording on the recording medium (step S107). Next, in step S108, the recording medium is conveyed to determine whether or not there is recording data for the next printing. If there is recording data, the process proceeds to step S109, and the paper edge sensor 15 detects the trailing edge of the recording medium. Determine whether or not. If the trailing edge of the recording medium is not detected, the process returns to step S106, and a predetermined amount of the recording medium is conveyed (step S106) and printing on the recording medium (step S107) is repeatedly executed.

  If it is determined in step S108 that there is no next recording data, the process proceeds to step S115, where a paper discharge operation is performed to discharge the recording medium outside the recording apparatus, and the recording ends (step S116). On the other hand, when the paper edge sensor 15 detects the trailing edge of the recording medium in step S109, the process proceeds to step S110, where the trailing edge of the recording medium passes through the first conveying roller pair including the conveying roller 4 and the pinch roller 5. Until the conveyance of a predetermined amount determined by the geometric configuration between the steps S106 to S109 is completed, the operations of conveyance, recording, and rear end detection in steps S106 to S109 are repeated.

  If it is determined in step S110 that the trailing edge of the recording medium has passed the conveyance roller pairs 4 and 5, the process proceeds to step S111, the conveyance of the recording medium is stopped, and the encoder sensor 42 is moved to the first position on the conveyance roller 4. The encoder wheel 40 is moved to the second encoder wheel 41 on the paper discharge roller 7. That is, by the control operation of the drive source such as the solenoid 44, the position of the encoder sensor 42 is changed from the position (FIG. 2) where the detection pattern of the first encoder wheel 40 on the shaft of the transport roller 4 can be read. Then, it is moved to a position (FIG. 3) where the detection pattern of the second encoder wheel 41 on the shaft of the paper discharge roller 7 can be read. Here, the reason why the encoder sensor 42 is moved in a state where the conveyance of the recording medium is stopped is that if the encoder sensor 42 is moved while the recording medium is conveyed, the conveyance amount during that time cannot be detected. This is because the transport amount cannot be controlled. Therefore, it is necessary to move the encoder sensor 42 while stopping the conveyance.

  After the encoder sensor 42 is moved from the first encoder wheel 40 to the second encoder wheel 41, the encoder sensor 42 detects the slit of the second encoder wheel 41, and the conveyance amount and conveyance speed of the recording medium are set to a predetermined value. The recording medium is conveyed while performing feedback control so as to be a value (step S112). Then, the printing operation is started when it is determined from the detection result of the rotation amount of the second encoder wheel 41 that a predetermined amount of the recording medium has been conveyed (step S113). In the next step S114, it is determined whether or not there is the next recording data. If there is recording data, the process returns to step S112, and the recording medium conveyance amount control by the second encoder wheel 41 and the printing operation are repeated. Steps S112 to S114 are repeated, and if it is determined in step S114 that all of the recording data has been recorded, the process proceeds to step S115, the recording medium is ejected from the recording apparatus, and a series of recording for recording is performed in step S116. End the operation.

  In the embodiment described above, the conveyance of the recording medium is started, and the rear end in the conveyance direction from the front end in the conveyance direction of the recording medium passes through the paper end sensor lever 13 constituting the edge detection unit, and the conveyance of the recording medium is performed. Until the rear end of the direction passes through the conveying roller 4 and the pinch roller 5, the encoder wheel 40 provided on the conveying roller 4 is selected as the detected means, and the signal of the encoder wheel 40 is used to determine the amount of conveyance. Control is performed.

  On the other hand, the paper discharge roller 7 is provided until the rear end of the recording medium passes through the paper end sensor lever 13 and passes through the conveying roller 4 until the rear end of the recording medium is discharged from the main body of the recording apparatus. The encoder wheel 41 thus selected is selected as the detected means, and the transport amount is controlled using the signal of the encoder wheel 41. As a result, as compared with the case where the transport amount of the entire region is controlled using a signal from one encoder wheel, the control is always performed in the entire transport region while directly detecting the operation of the roller that is transporting. Therefore, the recording medium can be accurately conveyed. In this case, in the first encoder wheel 40 and the second encoder wheel 41, the encoder slits which are their detection patterns are set so as to have the same resolution on the recording medium.

  That is, according to the above embodiment, the first and second rotation amount detected means 40 and 41 are provided on the axes of the conveying means 4 and 7 on the upstream side and the downstream side in the conveying direction of the recording head 9, respectively. The state of rotation of the transport roller on the side corresponding to the actual transport amount is detected from the end of the recording medium passing through the transport roller 4 until the rear end thereof passing through the paper discharge roller 7, and based on the detection result The conveyance of the recording medium can be controlled in a closed loop. Therefore, accurate conveyance control can be performed on the entire recording medium. Further, only one encoder sensor 42 for detecting the slits of the encoder wheels 40 and 41 is provided, and the position of the encoder sensor 42 is moved to the encoder wheel side of the conveying means that is actually conveying by the signal of the paper edge sensor 15. In addition, since the detected encoder wheel is switched and detected, it is possible to perform inexpensive and accurate transport control over the entire recording medium.

  In the above-described embodiment, the case of a serial type recording apparatus that performs recording while moving the recording head relative to the recording medium (main scanning) has been described as an example. The present invention can be similarly applied to the case of a line type recording apparatus that performs recording only by sub-scanning using a recording head having a length that covers the entire width or a part of the recording head. Further, the present invention can be applied to all recording apparatuses regardless of the recording system such as the ink jet system, the thermal transfer system, the laser beam irradiation system, and the wire dot system, and has the same effects in all the recording apparatuses. Is.

  The present invention also provides a gradation using a recording apparatus using one recording head, a color recording apparatus using a plurality of recording heads that record with different color inks, or a plurality of recording heads that record with the same color and different densities. The present invention can be similarly applied to a recording apparatus and further to a recording apparatus that combines these, and the same effect can be achieved. Further, when the present invention is applied to an ink jet recording apparatus, a configuration using a replaceable ink cartridge in which the recording means and the ink tank are integrated, the recording means and the ink tank are separated, and an ink supply tube or the like is provided between them. The present invention can be similarly applied to any arrangement of the recording means and the ink tank, such as a connection configuration, and the same effect can be obtained.

FIG. 2 is a schematic perspective view illustrating a main configuration of a recording apparatus according to the present invention. FIG. 6 is a schematic side view showing a state when a recording medium is being conveyed by a conveyance roller of a conveyance drive control system of the recording apparatus according to the present invention. FIG. 3 is a schematic side view showing a state when a recording medium is conveyed by a discharge roller of the conveyance drive control system of FIG. 2. FIG. 3 is a schematic plan view of the transport drive control system in FIG. 2. 6 is a flowchart illustrating an operation sequence of a conveyance drive control system of the recording apparatus according to the embodiment of the invention. 1 is a schematic longitudinal sectional view showing an overall configuration of a recording apparatus suitable for applying the present invention. FIG. 10 is a schematic perspective view illustrating a schematic configuration of a conveyance system of a conventional recording apparatus. It is a typical side view which shows the drive mechanism of the conveyance system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic paper feeder 2 Paper feed roller 3 Pressure plate 4 1st conveyance means (conveyance roller)
5 Pinch roller (first transport means)
6 Spur (second transport means)
7 Second conveying means (paper discharge roller)
8 Platen 9 Recording head 10 Carriage 11 Guide shaft 12 Chassis 13 Paper edge sensor lever (edge detection means)
14 Electric board 15 Edge detection means (paper edge sensor)
20 base 21 transport motor 30 timing belt 33 idler gear 40 first rotation amount detected means (first encoder wheel)
41 Second rotation amount detected means (second encoder wheel)
42 Rotation amount detection means (encoder sensor)
43 Holder member 44 Drive source (solenoid)
45 Spring 51 Transport roller gear 52 Paper discharge roller gear

Claims (9)

In a recording apparatus for recording on a recording medium conveyed by a recording head based on recording information,
First conveying means disposed upstream of the recording head in the conveying direction;
A second transport unit disposed on the downstream side in the transport direction of the recording head;
First rotation amount detection means provided in the first transport means;
Second rotation amount detection means provided in the second transport means;
End detection means for detecting the end of the recording medium at a position upstream of the first transport means in the transport direction;
A rotation amount detecting means capable of selectively detecting the first rotation amount detected means and the second rotation amount detected means;
Controlling the first transport means based on a detection signal of the first rotation amount detected means by the rotation amount detection means;
The recording apparatus according to claim 1, wherein the second conveying unit is controlled based on a detection signal of the second rotation amount detected unit by the rotation amount detecting unit.   The recording apparatus according to claim 1, wherein the rotation amount detection unit selects a rotation amount detection unit for controlling a conveyance amount based on a signal from the end detection unit.   The recording apparatus according to claim 2, wherein the rotation amount detection unit includes a unit that moves to a position where the selected rotation amount detection unit is detected based on a signal from the end detection unit.   The rotation amount detection unit starts conveyance of the recording medium, a conveyance direction rear end from the conveyance direction front end of the recording medium passes through the end detection unit, and a conveyance direction rear end of the recording medium is the first conveyance direction. The recording apparatus according to any one of claims 1 to 3, wherein the first rotation amount detection means is selected until it passes through the transport means.   The rotation amount detection unit is configured to wait until the rear end of the recording medium is ejected from the main body of the recording apparatus after the rear end of the recording medium passes through the end detection unit and passes through the first transport unit. The recording apparatus according to claim 1, wherein the second rotation amount detected means is selected.   The rotation amount detection means moves the second rotation amount detected means from a position where the first rotation amount detected means is detected when the first transfer means and the second transfer means are stopped. The recording apparatus according to claim 1, wherein the recording apparatus moves to a position to be detected.   The rotation amount detection means moves from a position for detecting the second rotation amount detected means to a position for detecting the first rotation amount detected means during a non-recording operation. The recording apparatus according to any one of 1 to 6.   The first rotation amount detected means is a first encoder wheel provided in the first transport means, and the second rotation amount detected means is a second encoder provided in the second transport means. The recording apparatus according to claim 1, wherein the rotation amount detection unit is an encoder sensor.   The first rotation amount detection means and the second rotation amount detection means are set so as to have the same resolution on the recording medium. The recording device according to item.

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