JP3667078B2 - Recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention records an image on a sheet About recording device For example, the present invention relates to a technique suitable for a so-called serial scan type recording apparatus that scans a recording head in a direction (for example, a direction orthogonal to the sheet) that intersects the sheet conveyance direction.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a recording apparatus having functions such as a printer, a copying machine, a facsimile, or a recording apparatus used as an output apparatus such as a composite electronic device including a computer or a word processor or a workstation is a sheet or plastic thin plate based on image information. An image is recorded on such a sheet.
[0003]
These recording apparatuses can be classified into an ink jet type, a wire dot type, a thermal type, a laser beam type, and the like according to a recording method. In a serial type recording apparatus that employs a serial scanning system that performs recording by scanning the recording head in a direction (main scanning direction) that intersects the sheet conveyance direction (sub-scanning direction), the recording head is mounted on a carriage that moves along the sheet. The recording head records an image, and after the recording for one line is completed, a predetermined amount of conveyance (pitch feed) is performed by the conveyance unit, and then the image of the next line is recorded on the stopped sheet again. By repeating the above operation, the entire sheet is recorded.
[0004]
On the other hand, in a line-type recording apparatus that records only by sub-scanning in the sheet conveyance direction, a sheet is set at a predetermined recording position, and after recording for one line at a time, a predetermined amount of conveyance (pitch) The entire sheet is recorded by repeating the operation of performing (feeding) and performing the next recording all at once.
[0005]
Among the above recording methods, an ink jet recording device (ink jet recording device) performs recording by ejecting ink from a recording head onto a sheet. The recording means can be easily made compact, and a high-definition image can be obtained. It can be recorded at high speed, and can also be recorded on plain paper without requiring special processing. The running cost is low, and it is a non-impact method. In addition, there is an advantage that it is easy to record a color image using multicolor inks.
[0006]
In particular, an ink jet recording unit that discharges ink using thermal energy is subjected to a semiconductor manufacturing process such as etching, vapor deposition, sputtering, and the like, an electrothermal transducer formed on a substrate, an electrode, a liquid channel wall, By forming the top plate or the like, a product having a high-density liquid passage arrangement (discharge outlet arrangement) can be easily manufactured, and further downsizing can be achieved.
[0007]
A conventional example of the serial scan type recording apparatus will be described with reference to FIGS. In FIG. 9, reference numeral 101 denotes a conveyance roller for conveying the sheet P, and a pinch roller 102 is pressed against the conveyance roller 101. A sensor lever 103 is provided on the upstream side (hereinafter simply referred to as “upstream side”) of the conveying roller 101 in the sheet conveying direction. The sensor lever 103 is rotatable about a shaft 103a, and the conveyed sheet P is a flag 103b of the sensor lever 103. When the sensor lever 103 is rotated about the shaft 103a, the sensor operating portion 103c of the sensor lever 103 operates the rear end detection sensor 104 to detect the passage of the sheet P.
[0008]
On the downstream side of the conveyance roller 101 in the sheet conveyance direction (hereinafter, simply referred to as “downstream side”), a recording head 105 that records an image based on image information intersects the sheet conveyance direction (sub-scanning direction) (main scanning direction). The platen 106 that supports the back surface of the sheet P is disposed opposite to the recording head 105.
[0009]
On the downstream side of the recording head 105, a discharge roller 108 that rotates at the same peripheral speed as the conveying roller 101 is disposed via a transmission roller 107, and a spur 109 is pressed against the discharge roller 108.
[0010]
In the above configuration, in the state where the trailing end Pb of the sheet P is conveyed to the downstream side of the nip portion n between the conveying roller 101 and the pinch roller 102, the sheet P is separated from the conveying roller 101. The supporting action by the conveying force and clamping by the roller only acts by the discharge roller 108 and the spur 109.
[0011]
Therefore, in this state, the function of pressing the trailing edge Pb of the sheet P does not work, and therefore the optimum gap between the recording head 105 and the sheet P is not secured due to the floating of the sheet P. In this state, the recording head 105 performs image recording. If you do this, you cannot expect high-quality image recording. Further, when the rear end Pb of the sheet P is bent toward the recording head 105 or warped, the sheet P may be rubbed against the recording head 105 to contaminate the recording surface.
[0012]
That is, in general, in a serial scan type recording apparatus, it is difficult to guarantee the quality of a recorded image after the trailing end Pb of the sheet P passes through the nip portion n between the discharge roller 108 and the pinch roller 102.
[0013]
Nevertheless, when considering use as a recording apparatus such as a facsimile or a copying machine, there is a strong demand for recording an image over the recording surface of the sheet P. Therefore, as shown in FIG. 10, a lift prevention unit 106a for holding the upper surface side of the one side end Pr (conveying reference side) parallel to the sheet transport direction of the sheet P and preventing the one side end Pr from lifting is provided. Further, the lift of the other end Pl on the opposite side of the one end Pr of the sheet P hits the recording head 105 and jams at the lower end of the carriage on which the recording head 105 is mounted. Some jam prevention ribs 105a are provided.
[0014]
According to the above configuration, one side end Pr of the sheet P is sandwiched between the upper surface of the platen 106 and the anti-lifting portion 106a, and at least {L in FIG. ₁ -L ₂ } Can be separated from the nozzle surface of the recording head 105. Even if the other end portion Pl of the sheet P is lifted, the other end portion Pl where the jam prevention rib 105a provided on the carriage on which the recording head 105 is mounted is guided downward and retracted from the recording head 105. It is possible to prevent a jam from occurring when the recording head 105 collides with the sheet P.
[0015]
[Problems to be solved by the invention]
In recent years, there is a strong demand for recording on various types of sheets, and the recording apparatus tends to be required to cope with this. However, in the above-described conventional example, when the sheet P having a very high rigidity is used, the trailing edge Pb of the sheet P is warped upward, and the recording with the full recording width is performed up to the vicinity of the trailing edge Pb of the sheet P. In this case, when the recording head 105 is restored after scanning, the other end portion Pl of the sheet P hits against a jam prevention rib 105a provided on the carriage, and there is a possibility that the carriage on which the recording head 105 is mounted is obstructed.
[0016]
The present invention solves the above-mentioned problems, and the object of the present invention is also for various types of sheets. carriage The recording range at the trailing edge of the sheet can be expanded without obstructing the scanning operation Provide recording device It is something to be done.
[0017]
[Means for Solving the Problems]
To achieve the above object, a typical configuration of a recording apparatus according to the present invention includes a first sheet conveying unit that conveys a sheet, and the first sheet conveying unit. of Downstream With recording means In the direction that intersects the sheet conveyance direction Moving carriage And said Carriage Downstream Arranged A second sheet conveying means for conveying the sheet, and between the first sheet conveying means and the second sheet conveying means in the sheet conveying direction. Arranged Parallel to the sheet conveyance direction Sheet A lift preventing member that holds the upper surface of the one side end portion to prevent the one side end portion from being lifted, and the first sheet conveying means. of Upstream Arranged A trailing edge detecting means for detecting the trailing edge of the sheet, and the trailing edge of the sheet is the first sheet conveying means. From pinching by After being released, when recording the last line by the recording means, Said On the opposite side of one end Of the sheet The position of the other end carriage Control means for controlling so as not to pass.
[0018]
In the above configuration The trailing edge of the sheet is due to the first sheet conveying means Pinching After the release, the position of the other side edge of the sheet that is not prevented from being lifted by the lifting prevention member when the last recording is performed by the recording means carriage By controlling by the control means so that does not pass, carriage Even if the sheet is relatively hard carriage Hits the sheet carriage The recording range at the trailing edge of the sheet can be expanded without hindering the scanning operation.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment when applied to an ink jet recording apparatus as an example of a recording apparatus and a control method of the recording apparatus according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing the configuration of a recording apparatus according to the present invention, FIG. 2 is a cross-sectional explanatory view showing the configuration of the recording apparatus according to the present invention, and FIG. FIG. 4 is a perspective view showing the configuration of the lifting prevention member, FIG. 5 is a perspective view showing the configuration of the jam prevention rib provided on the carriage on which the recording head is mounted, and FIG. 6 shows the lifting prevention member and the jam prevention rib. FIG. 7 is a block diagram showing the configuration of the control system of the recording apparatus according to the present invention, and FIG. 8 is a flowchart of the control system.
[0023]
First, the overall configuration of the recording apparatus according to the present invention will be described with reference to FIGS. 1 and 2, a recording apparatus 1 equipped with an automatic feeding device 2 that automatically feeds various sheets P such as paper and synthetic resin includes a sheet feeding unit 3, a sheet conveying unit 4, a sheet discharging unit 5, The carriage unit 6 includes a carriage unit 6, a cleaning unit 7, and an electric substrate 8.
[0024]
The sheet feeding unit 3 is attached to a base 11 with a pressure plate 9 for placing the sheet P provided in the automatic feeding device 2 and a feeding roller 10 for feeding the sheet P placed on the pressure plate 9. Is configured. A movable side guide 12 is provided on the pressure plate 9 so as to be movable in the width direction of the sheet P, and regulates the position where the sheet P is placed.
[0025]
The pressure plate 9 can rotate around a rotation shaft 13 provided on the base 11 and is urged against the feeding roller 10 by a pressure plate spring 14. A separation pad 15 made of a material having a large coefficient of friction such as an artificial leather that prevents double feeding of the sheet P is provided at a portion of the pressure plate 9 facing the feeding roller 10.
[0026]
Further, the base 11 covers corners in one direction of the sheet P, a separation claw (not shown) for separating the sheets P one by one, a bank portion 16 integrally formed with the base 11, and the pressure plate 9 and feeding. A release cam 17 or the like for releasing the contact of the roller 10 is provided.
[0027]
In the above configuration, in the standby state, the release cam 17 pushes the pressure plate 9 down to a predetermined position, whereby the contact between the pressure plate 9 and the feeding roller 10 is released. In this state, when the rotational driving force transmitted to the conveying roller 18 constituting the first sheet conveying means described later is transmitted to the feeding roller 10 and the release cam 17 by a gear train or the like, the release cam 17 Since the pressure plate 9 moves away from the sheet 9, the sheet feeding roller 10 and the sheet P come into contact with each other, and the sheet P is picked up by the rotation of the sheet feeding roller 10 to start feeding.
[0028]
Then, the sheets are separated one by one by a separation claw (not shown) and sent to the sheet feeding unit 3. The feeding roller 10 and the release cam 17 rotate until the sheet P is fed into the sheet feeding unit 3, and are again in a standby state in which the contact between the sheet P and the feeding roller 10 is released and transmitted from the conveying roller 18. The rotational driving force is released.
[0029]
The sheet conveying unit 4 includes a conveying roller 18 serving as a first sheet conveying means for nipping and conveying the sheet P fed by the feeding roller 10, and a pinch roller 19 in pressure contact with the conveying roller 18. A sensor lever 20 constituting rear end detecting means is provided on the downstream side of the roller 10 and on the upstream side of the conveying roller 18 (see FIG. 3).
[0030]
The pinch roller 19 is rotatably held by a pinch roller guide 21 and is urged by a pinch roller spring 22 so that the pinch roller 19 comes into pressure contact with the transport roller 18 and the nip between the transport roller 18 and the pinch roller 19 The sheet P is nipped and supported by the part n and conveyed.
[0031]
An upper guide 23 and a platen 24 for guiding the sheet P are disposed at the entrance of the sheet conveying unit 4, and the upper lever 23 transmits the detection of the leading edge and the trailing edge of the sheet P to the trailing edge detection sensor 25. 20 are provided.
[0032]
As shown in FIG. 3, the sensor lever 20 is pivotally supported by a shaft 20a and is urged by an urging spring (not shown). When the sheet P does not pass, the flag 20b of the sensor lever 20 is It is held in a state where it is lowered to the platen 24 side from the conveying surface. At this time, the sensor operating portion 20c of the sensor lever 20 blocks the optical path of the rear end detection sensor 25 and turns off the rear end detection sensor 25.
[0033]
When the sheet P guided and conveyed between the platen 24 and the upper guide 23 contacts the flag 20b of the sensor lever 20, the sensor lever 20 rotates about the shaft 20a in the clockwise direction in FIG. Then, the sensor operating portion 20c of the sensor lever 20 retracts from the optical path of the rear end detection sensor 25 and turns on the rear end detection sensor 25.
[0034]
Thereby, when the leading edge of the sheet P contacts the sensor lever 20, the trailing edge detection sensor 25 is switched from OFF to ON, and when the trailing edge Pb of the sheet P passes the sensor lever 20, the trailing edge detection sensor 25 is turned ON. Is switched from OFF to OFF. As a result, the trailing edge detection sensor 25 can detect the leading edge and trailing edge passage timing of the sheet P, and recognizes the leading edge and trailing edge positions of the sheet P conveyed through the sheet conveying portion 4 based on this detection information. It can be done.
[0035]
In the above configuration, the sheet P fed by the sheet feeding unit 3 is guided by the platen 24, the upper guide 23, and the pinch roller guide 21 and enters the nip portion n between the conveying roller 18 and the pinch roller 19. At this time, the sensor lever 20 detects the leading edge of the conveyed sheet P, thereby setting the recording position of the sheet P. The conveyance roller 18 is rotationally driven by an unillustrated LF (line feed) motor 27 and the sheet P is conveyed while being nipped and supported by a nip portion n with a pinch roller 19 driven by the conveyance roller 18.
[0036]
The carriage unit 6 includes an inkjet recording head 26 that is disposed downstream of the conveyance roller 18 and serves as a recording unit that records an image based on image information, and intersects the sheet conveyance direction (sub-scanning direction) (for example, , The carriage 28 is provided so as to be movable in the orthogonal direction.
[0037]
The carriage 28 holds the guide shaft 29 for reciprocating scanning in the direction (main scanning direction) intersecting the conveyance direction of the sheet P and the rear end of the carriage 28 to maintain a gap between the recording head 26 and the sheet P. The guide shaft 29 and the guide rail 30 are attached to a chassis 31 of the apparatus main body.
[0038]
The carriage 28 is driven via a timing belt 33 by a carriage motor 32 attached to the chassis 31. This timing belt 33 is stretched by an idle pulley 34. Further, the carriage 28 is provided with a flexible substrate 35 for transmitting a recording signal from the electric substrate 8 to the recording head 26.
[0039]
In the above configuration, when an image is recorded on the sheet P, a pair of rollers by the conveyance roller 18 and the pinch roller 19 conveys the sheet P to a row position (position in the conveyance direction of the sheet P) where the image is recorded, and a carriage motor The carriage 28 is moved to a row position (position orthogonal to the conveying direction of the sheet P) by 32 to move the recording head 26 to face the image recording position. Thereafter, the recording head 26 ejects ink toward the sheet P by the recording signal from the electric substrate 8 to record an image.
[0040]
The recording head 26 includes a fine liquid discharge port (orifice), a liquid path, an energy action part provided in a part of the liquid path, and an energy generation means for generating droplet formation energy that acts on the liquid in the action part. It has.
[0041]
As an energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, an energy generating means for generating heat by irradiating an electromagnetic wave such as a laser and discharging a droplet by the action of the generated heat Or a recording method using energy generating means for discharging a liquid by heating the liquid with an electrothermal transducer such as a heating element having a heating resistor.
[0042]
Among them, a recording head used in an ink jet recording method in which a liquid is ejected by thermal energy has a high density of liquid ejection openings (orifices) for ejecting recording droplets to form ejection droplets. Therefore, it is possible to record at high resolution.
[0043]
Among them, a recording head using an electrothermal transducer as an energy generating means can be easily made compact, and can sufficiently overcome the advantages of IC technology and micromachining technology that have made remarkable progress in technology and improved reliability in the recent semiconductor field. It is advantageous because it can be used in half, easy to mount with high density, and inexpensive to manufacture.
[0044]
In the above-described embodiment, the ink jet recording system is used as the recording unit. However, the electrothermal transducer is energized in accordance with the recording signal, and the film boiling generated in the ink is utilized by the thermal energy applied by the electrothermal transducer. Further, it is more preferable that recording is performed by ejecting ink from the ejection port by the growth and contraction of bubbles generated in the ink.
[0045]
As its typical configuration and principle, for example, those performed using the basic principle disclosed in US Pat. Nos. 4,723,129 and 4740796 are preferable.
[0046]
The sheet discharge section 5 is disposed on the downstream side of the recording head 26 and includes a discharge roller 36 that constitutes a second sheet conveying means, and a rotatable spur 37 that is in pressure contact with the discharge roller 36. In addition, a transmission roller 38 is in contact with the discharge roller 36, and the transmission roller 38 is provided in contact with the transport roller 18. Accordingly, the rotational driving force of the conveying roller 18 is transmitted to the discharge roller 36 via the transmission roller 38, and the spur 37 rotates following the rotation of the discharge roller 36.
[0047]
With the above configuration, the sheet P on which an image is recorded by the carriage unit 6 is conveyed while being supported by being sandwiched and supported by the nip portion between the discharge roller 36 and the spur 37, and is discharged onto a discharge tray (not shown) provided outside the apparatus. The
[0048]
The cleaning unit 7 includes a pump 39 for cleaning the recording head 26, a cap 40 for suppressing the drying of the recording head 26, and a drive switching arm for switching the driving force from the discharge roller 36 to the sheet feeding unit 3 and the pump 39. It has 41 mag.
[0049]
When the drive switching arm 41 is in a position other than the feeding position of the sheet P or the cleaning position of the recording head 26, a planetary gear (not shown) that rotates around the rotation shaft of the conveying roller 18 is fixed at a predetermined position. Therefore, the driving force is not transmitted to the sheet feeding unit 3 and the pump 39.
[0050]
When the drive switching arm 41 is moved in the direction of arrow A in FIG. 1 due to the movement of the carriage 28, the planetary gear becomes free, so that the planetary gear moves according to the forward / reverse rotation of the conveying roller 18, When the roller 18 rotates in the forward direction, the driving force is transmitted to the sheet feeding unit 3, and when the roller 18 rotates in the reverse direction, the driving force is transmitted to the pump 39.
[0051]
As shown in FIG. 4, an upper surface of one end Pr (conveying reference side) parallel to the sheet conveying direction of the sheet P is provided between the conveying roller 18 and the discharge roller 36 in the sheet conveying direction on the platen 24. The platen 24 is integrally formed with a lifting prevention portion 24a that serves as a lifting restriction (prevention) member that suppresses (or prevents) the lifting of the one side end portion Pr of the sheet P. As shown in FIGS. 5 and 6, the lower end of the carriage 28 to be mounted is in contact with the other end Pl of the sheet P and prevents the jam from guiding the other end Pl of the sheet P to the platen 24 side. Ribs 28a are formed.
[0052]
With the above configuration, when the rigidity of the sheet P is relatively small, the jamming of the carriage 28 occurs when the recording head 26 deviated from the position of the other side end portion Pl of the sheet P returns to the recording start position on the lift prevention unit 24a side. The other end Pl of the sheet P is guided by the prevention rib 28a and pushed down toward the platen 24, and the recording head 26 can be returned to the recording start position without any trouble.
[0053]
Next, the configuration of the control means of the recording apparatus according to the present invention will be described with reference to FIG. The configuration of the electrical block diagram shown in FIG. 7 controls the printer controller 42, RAM (Random Access Memory) 43, ROM (Read Only Memory) 44, and the like for executing electromechanical control at high speed by hardware. It has a CPU (central processing unit) 45 to be controlled.
[0054]
The printer controller 42 is a GA with several thousand gates, and internally communicates with an external host 46 and the like to receive image data, and sequentially stores them in a reception buffer 47 in the RAM 43, an LF motor 27, a carriage motor 32, a mechanism control unit 50 for controlling a key switch or LED (light emitting diode) 49 and the like, and processing the image data into a recordable format, storing it in the print buffer 51, and sending the data to the recording head 26 at an appropriate timing, A recording head control unit 52 for performing recording is provided.
[0055]
The RAM 43 is divided into the reception buffer 47 and the print buffer 51 as described above. The print buffer 51 has a function of storing data in such a way that the recording head 26 can record data in exactly one scan.
[0056]
The ROM 44 includes a program unit 53 that stores a program code for controlling the CPU 45 and a CG (character generator) 54 that stores character font data.
[0057]
The CPU 45 controls the printer controller 42, the RAM 43, and the ROM 44 described above according to the program code. Further, the state of the rear end detection sensor 25 is monitored as needed.
[0058]
In the above configuration, first, when the CPU 45 is activated, an initial check of the main body of the recording apparatus 1 is performed, and then a standby state is entered. In this state, when the user operates data from an external host 46 such as an external computer or a control button (not shown), the recording apparatus 1 performs a predetermined operation.
[0059]
The data received via the interface control unit 48 is spooled in the reception buffer 47 as appropriate, and after undergoing a predetermined data conversion process by the CPU 45, it is divided into a recordable amount by one scan of the recording head 26. And sent to the print buffer 51.
[0060]
Data in the print buffer 51 is sent out to the recording head 26 via the flexible substrate 35 under the control of the printer controller 42 and the CPU 45 in a timely manner. At this time, the CPU 45 can operate the carriage motor 32 in a timely manner and record a desired image at a desired position.
[0061]
Further, upon receipt of a sheet conveyance command in the data sent from the external host 46, or by a user operating a control button, the CPU 45 operates the LF motor 27 by a predetermined amount to convey the sheet P.
[0062]
Further, the CPU 45 monitors the trailing edge detection sensor 25 during the sheet conveyance. The leading edge and the trailing edge of the sheet P operate the sensor lever 20, and the trailing edge detection sensor 25 is turned on / off to turn on the sheet P. The passage timing of the front and rear ends of the is managed.
[0063]
Next, details of the recording control at the trailing edge of the sheet P will be described using the flowchart shown in FIG. The rear end Pb of the sheet P is detected by detecting that the rear end Pb is at the position M in FIG. ₀ 3, the sensor lever 20 is separated from the sensor lever 20, and the sensor lever 20 is rotated counterclockwise in FIG. 3 about the shaft 20 a by a biasing spring (not shown), and the sensor operating portion 20 c of the sensor lever 20 detects the rear end. This is detected by blocking the optical path of the sensor 25 and turning off the rear end detection sensor 25. If the CPU 45 stores this timing, the position of the trailing edge Pb of the sheet P can be recognized by adding the transport amount of the subsequent sheet P as appropriate.
[0064]
Before the detection of the trailing edge Pb of the sheet P, the sheet P is supported by being sandwiched and supported by the nip portion n between the conveying roller 18 and the pinch roller 19, so that the sheet P does not float and the trailing edge Pb of the sheet P is detected. Previously, normal recording conveyance control may be performed.
[0065]
That is, if the trailing edge Pb of the sheet P is not detected by the trailing edge detection sensor 25 in step S1 in FIG. 8, the recording head 26 performs recording for one scan accumulated in the print buffer 51 (step S1). S2) Immediately transports a predetermined amount of sheets (sub-scan) (step S3), and at the same time, the carriage 28 returns (has been regulated (prevented) by a lift prevention unit 24a serving as a lift regulating (preventing) member). The recording head 26 is returned to the recording start position (home position) (step S4).
[0066]
Further, in step S1, even after the trailing edge Pb of the sheet P is detected by the trailing edge detection sensor 25, the trailing edge Pb of the sheet P passes through the nip portion n between the conveying roller 18 and the pinch roller 19. Then, if the sheet is separated downstream and before being released from nipping, there is no problem in the conveyance control in steps S2 to S4 described above. However, in the sheet conveyance performed after one scan recording, the trailing edge Pb of the sheet P is If the sheet is separated from the nip portion n between the conveyance roller 18 and the pinch roller 19 and released from the nipping between the conveyance roller 18 and the pinch roller 19, the sheet is not supported and cannot be pressed by the lifting prevention unit 24a. The carriage 28 at the time of return passes through the other end portion P of P, and as described in the above-described conventional example, jamming of the sheet P due to contact of the carriage 28 and an operation failure of the carriage 28 are caused. May occur.
[0067]
Therefore, in this embodiment, even if the trailing edge Pb of the sheet P is positioned upstream of the nip portion n between the conveying roller 18 and the pinch roller 19 in step S5, in step S6, after the next one scan. When it is recognized that the trailing edge Pb of the sheet P is not supported by moving downstream of the nip portion n between the conveying roller 18 and the pinch roller 19 in step S5, the trailing edge Pb of the sheet P is detected in step S5. Is configured to perform the same control as in the case where they are separated downstream from the nip portion n between the conveying roller 18 and the pinch roller 19.
[0068]
Here, the control when the trailing edge Pb of the sheet P is separated downstream from the nip n between the conveying roller 18 and the pinch roller 19 is divided into two types corresponding to the number of recording scans thereafter.
[0069]
That is, in step S7, it is determined whether or not the data to be recorded on the sheet P is finished in the next one scan. When the data to be recorded on the sheet P is finished in the next one scan (that is, At the time of the last main scan, after the recording for one scan accumulated in the print buffer 51 is performed by the recording head 26 (step S8), the carriage 28 does not perform the return operation and is opposite to the recording start position. It moves to the outside of the other side end portion Pl of the side sheet P (step S9). Then, with the carriage 28 stopped in this area, the sheet P is discharged (sub-scanning) (step S10).
[0070]
By performing this control, the carriage 28 hits the other side end portion Pl of the sheet P in the last line recording (final main scanning) performed at the rear end portion of the sheet P, and the sheet P jams. There is no possibility that an operation failure of the carriage 28 occurs.
[0071]
After the sheet P is discharged and the trailing end Pb of the sheet P is sufficiently separated from the carriage 28, at least the trailing end Pb of the sheet P is at the position M shown in FIG. ₁ When the sheet is discharged further downstream, the carriage 28 is restored to prepare for recording on the next sheet P (step S11).
[0072]
In step S7, when the data to be recorded on the sheet P is not completed in the next scan, the recording head 26 performs recording for one scan accumulated in the print buffer 51 (step S12). The carriage 28 is immediately returned to the recording start position without carrying it (step S13). Then, a predetermined amount of sheets are conveyed with the carriage 28 stopped at the recording start position (step S14).
[0073]
That is, the sub-scan in step S14 in FIG. 8 is a sub-scan for performing the next main scan thereafter. In particular, when the next main scan is the last main scan, the sub scan is performed immediately before the last main scan. In this sub-scanning, whether the answer is YES in step S5, NO in step S5, or YES in step S6, the trailing edge of the sheet P is positioned downstream of the conveying roller 18 at the end of the sub-scanning.
[0074]
At this time, the carriage 28 passes through the other end portion Pl of the sheet P on the side without the lifting prevention portion 24a. At this time, the sheet P is stopped, so that the other end portion Pl of the sheet P and the carriage 28 are stopped. Is unlikely to hit.
[0075]
In the control after the determination in step S6, the carriage 28 passes the other end P1 of the sheet P in a state where the sheet P is nipped by the nip n between the conveying roller 18 and the pinch roller 19. Therefore, the effect of preventing the sheet P from contacting the other end P1 of the sheet P and the carriage 28 is great.
[0076]
In step S14, the conveyance of the sheet P in the state where the carriage 28 is at the recording start position is provided with the floating prevention unit 24a at a position close to the carriage 28. Therefore, the carriage 28 (or the recording head 26) and the sheet P are conveyed. There is no contact with.
[0077]
In step S6, when it is recognized that the trailing edge Pb of the sheet P is positioned upstream of the nip portion n between the conveying roller 18 and the pinch roller 19 in the sheet conveyance after the next one scan, The same control as in steps S2 to S4 is performed (steps S15 to S17).
[0078]
Further, when the sub-scan is performed immediately before the last main scan, and the trailing end of the sheet P is positioned downstream of the transport roller 18 in the sheet transport direction before the start of the sub-scan, the sub-scan is performed. Before the start of scanning, the carriage 28 is moved to the one side end portion Pr side of the sheet P that is prevented from being lifted by the lift preventing portion 24a.
[0079]
That is, the sub-scan is a sub-scan in step S14 in the case of YES in step S5 in FIG. 8 and further proceeds from step S7 to steps S8 to S11 after returning to the start.
[0080]
Further, in the case of performing sub-scanning immediately before the final main scanning, and when the trailing edge of the sheet P passes the conveying roller 18 during the sub-scanning, the carriage 28 is moved before the start of the sub-scanning. The sheet P is moved to the one-side end portion Pr side of which the lifting is prevented by the lifting prevention unit 24a.
[0081]
That is, the sub-scan is NO in step S5 in FIG. 8, and is sub-scan in step S14 in the case of YES in step S6. Further, after returning to the start, the process proceeds from step S7 to steps S8 to S11. Sub-scanning.
[0082]
Further, in the case of performing sub-scanning for transporting the sheet P for the next main scanning, and when the trailing end of the sheet P is located downstream of the transporting roller 18 at the end of the sub-scanning, Prior to the start of sub-scanning, the carriage 28 is moved to the one-side end portion Pr side of the sheet P that is prevented from being lifted by the lift-preventing portion 24a.
[0083]
That is, the sub-scan is the sub-scan of step S14 in the case of YES in step S5 of FIG. 8, or NO in step S5 and YES in step S6.
[0084]
Further, in the case of performing sub-scanning for transporting the sheet P for the next main scanning, and when the trailing end of the sheet P is positioned downstream of the transporting roller 18 before the start of the sub-scanning, Before the start of the sub-scanning, the carriage 28 is moved to the one side end portion Pr side of the sheet P, which is prevented from being lifted by the lift preventing portion 24a.
[0085]
That is, the sub-scan is the sub-scan of step S14 in the case of YES in step S5 of FIG.
[0086]
Further, in the case of performing the sub-scan for transporting the sheet P for the next main scan, and the trailing end of the sheet P passes the transport roller 18 during the sub-scan, the sub-scan starts. Previously, the carriage 28 is moved to the one side end portion Pr side of the sheet P, which is prevented from being lifted by the lift preventing portion 24a.
[0087]
That is, the sub-scan is the sub-scan of step S14 in the case of NO in step S5 in FIG. 8 and YES in step S6.
[0088]
In the above-described embodiment, the configuration has been described in which the problem of the recording of the last line is eliminated at the rear end portion of the sheet P. However, as another configuration, in a recording apparatus in which a recordable area is set relatively narrow in advance, It is possible to increase the recording area by the maximum effective recording width of the recording head 26 by the same configuration as that of the above-described embodiment.
[0089]
Further, as the form of the above-described ink jet recording apparatus, in addition to the one used as an image output terminal apparatus of information processing equipment such as a computer, a copying apparatus combined with a reader or the like, and further a facsimile apparatus having a transmission / reception function. Etc.
[0090]
Moreover, although the example using the inkjet recording system as the recording means described above has been described, the present invention does not need to limit the recording system to the inkjet recording system, and other than that, the thermal transfer recording system, the thermal recording system, and further the wire dot Even an impact recording system such as a recording system or other recording systems can be applied.
[0091]
【The invention's effect】
According to the present invention Recording device Because of the above-described configuration and action, there is a risk of causing jamming of the sheet and an operation failure of the recording means in the recording operation at the rear end portion of the sheet regardless of differences in the material, bending, warping, thickness, etc. of the sheet. Thus, the recording range of the trailing edge of the sheet can be expanded and a highly reliable recording apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a recording apparatus according to the present invention.
FIG. 2 is an explanatory cross-sectional view showing a configuration of a recording apparatus according to the present invention.
FIG. 3 is an explanatory cross-sectional view showing a configuration of a main part of the recording apparatus according to the present invention.
FIG. 4 is a perspective view showing a configuration of a lifting prevention member.
FIG. 5 is a perspective view illustrating a configuration of a jam prevention rib provided on a carriage on which a recording head is mounted.
FIG. 6 is a view for explaining the action of the lifting prevention member and the jam prevention rib on the sheet.
FIG. 7 is a block diagram illustrating a configuration of a control system of the recording apparatus according to the present invention.
FIG. 8 is a flowchart of a control system.
FIG. 9 is a diagram illustrating a conventional example.
FIG. 10 is a diagram illustrating a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Recording device, 2 ... Automatic feeding apparatus, 3 ... Sheet feeding part, 4 ... Sheet conveyance part, 5 ... Sheet discharge part, 6 ... Carriage part, 7 ... Cleaning part, 8 ... Electric substrate, 9 ... Pressure plate, 10 ... feed roller, 11 ... base, 12 ... movable side guide, 13 ... rotating shaft, 14 ... pressure plate spring, 15 ... separation pad, 16 ... bank, 17 ... release cam, 18 ... conveying roller, 19 ... pinch roller 20 ... sensor lever, 20a ... shaft, 20b ... flag, 20c ... sensor operating part, 21 ... pinch roller guide, 22 ... pinch roller spring, 23 ... upper guide, 24 ... platen, 24a ... lifting prevention part, 25 ... rear End detection sensor, 26 ... recording head, 27 ... LF motor, 28 ... carriage, 28a ... jam prevention rib, 29 ... guide shaft, 30 ... guide rail, 31 ... chassis, 32 ... carriage motor, 33 ... timing belt, 34 ... Idle pulley, 35 ... Flexible substrate, 36 ... Output roller, 37 ... Spur, 38 ... Transmission roller, 39 ... Pump, 40 ... Cap, 41 ... Drive switching arm, 42 ... Printer controller, 43 ... RAM, 44 ... ROM, 45 ... CPU, 46 ... External host, 47 ... Reception buffer 48 ... Interface control unit 49 ... Key switch / LED 50 ... Mechanism control unit 51 ... Print buffer 52 ... Recording head control unit 53 ... Program unit 54 ... CG, P ... Sheet, Pb ... After End, Pr: One end, Pl: Other end, n: Nip

Claims (3)

First sheet conveying means for conveying a sheet;
Disposed downstream of said first sheet conveying means, a carriage that moves in a direction intersecting the sheet conveying direction is mounted so that the recording means,
A second sheet conveying means arranged on the downstream side of the carriage for conveying the sheet;
In the sheet conveying direction, it is arranged between the first sheet conveying means and the second sheet conveying means, and presses the upper surface of one side end portion of the sheet parallel to the sheet conveying direction to lift the one side end portion An anti-lifting member to prevent
Disposed upstream of said first sheet conveying means, and trailing edge detection means for detecting the trailing edge of the sheet,
After the trailing edge of the sheet is released from nipping by the first sheet conveying means, when recording the end row by the recording means, the other end portion opposite the sheet of the one end Control means for controlling the position so that the carriage does not pass through;
A recording apparatus comprising: The control means returns the carriage to the recording start position after discharging the sheet by the second sheet conveying means in a state where the carriage is moved to the outside of the other side end. The recording apparatus according to 1. The first sheet conveying means includes a conveying roller and a pinch roller that is in pressure contact with the conveying roller, and the second sheet conveying means includes a discharge roller and a spur that is in pressure contact with the discharge roller. The recording apparatus according to claim 1, wherein the recording apparatus has a recording apparatus .

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