JPH1029352A - Sheet material transport device and recording device - Google Patents

Abstract

(57) [Problem] To improve transport accuracy after forward / reverse rotation of a transport roller in an operation such as wiping or the like, and prevent deterioration in image quality due to transport unevenness. A conveying means for conveying a sheet material,
A drive source for driving the transport unit, and a control unit for controlling the drive of the drive source, wherein the drive source is a forward rotation direction that is a transport direction when transporting the sheet material. After the reverse rotation is driven in the reverse direction, when the normal rotation is driven to the original position before the reverse rotation, the amount of the reverse rotation is controlled to be divided into two or more times to perform the normal rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus for conveying a sheet, and more particularly, to a sheet conveying apparatus for conveying a sheet in an ink jet recording apparatus.

[0002]

2. Description of the Related Art Conventionally, a recording apparatus having functions such as a printer, a copying machine, and a facsimile, or a recording apparatus used as an output device of a composite electronic device or a workstation including a computer or a word processor, etc. It is configured to record an image on various sheet materials such as a sheet and a plastic thin plate.

In the above-mentioned printing apparatus, in a serial-type printing apparatus which employs a serial scan system in which a main scan is performed in a direction intersecting a conveying direction (sub-scanning direction) of a sheet material, a carriage moving along the sheet material is used. The image is recorded (main scanning) by the recording means mounted on the sheet, and after the recording of one line is completed, a predetermined amount of paper feeding (pitch conveyance) is performed. By repeating the operation of recording (main scanning) an image, the entire sheet material is recorded. On the other hand, in a line type recording apparatus that performs recording only in the sub-scanning direction of the sheet material, the sheet material is set at a predetermined recording position,
After printing one line at a time, a predetermined amount of paper feed (pitch conveyance) is performed, and then the operation of collectively printing the next line is repeated. Will be

Further, the above-mentioned recording apparatuses are classified into an ink jet system, a wire dot system, a thermal system, a laser beam system and the like according to the recording system. Of these recording methods, a recording apparatus (inkjet recording apparatus) that employs an ink jet method performs recording by discharging ink from a recording unit (recording head) onto a sheet material.
It is easy to make the recording head compact, can record high-definition images at high speed, can record without the need for special processing on plain paper, has low running costs, and is a non-impact method. Therefore, it has advantages such as low noise and easy recording of a color image using multicolor inks.

[0005] Although not shown, the above-mentioned conventional ink jet recording apparatus includes a feeding section for separating and feeding sheet materials one by one, a feeding section for feeding the fed sheet material to a printing position,
It is composed of a discharge unit that discharges and conveys a sheet material on which an image is recorded, a carriage unit that has a carriage that detachably has a recording head that records an image on the sheet material, a cleaning unit that cleans the recording head, and the like. .

The above components are configured to be driven by two motors. Specifically, the carriage is reciprocated by a carriage motor, and the rollers and the cleaning unit of each unit are driven by an LF motor. The LF motor normally drives a transport roller of a transport section and a discharge roller of a discharge section. The driving force from the transport roller of the transport unit is transmitted to the feeding unit or the cleaning unit by switching the drive switching arm that is switched by the movement of the carriage to a predetermined position.

The drive switching arm normally (at times other than feeding / cleaning) fixes a planetary gear that rotates about the axis of the transport roller at a predetermined position, so that it is driven by the feeding unit and the cleaning unit. No power is transmitted. Further, when the drive switching arm is switched by the movement of the carriage, the planetary gears become free. Therefore, the planetary gears move according to the forward / reverse rotation of the transport roller, and when the transport roller rotates forward, the planetary gear is driven. The driving force is transmitted to the cleaning unit when the force is transmitted, and when the rotation is reversed, the driving force is transmitted to the cleaning unit.

In a conventional ink jet recording apparatus, wiping is periodically performed during recording in order to remove dust, ink, and the like attached to a discharge surface of a recording head. Specifically, during printing, the carriage on which the print head is mounted reciprocates on the wiper of the cleaning unit, and the edge of the wiper scrapes off dust and ink on the ejection surface of the print head.

Therefore, when the carriage moves for the above-mentioned wiping, the drive switching arm disengages from the planetary gear and releases the planetary gear, and when the carriage returns to the original position before the movement, the drive switching arm is moved. Fix the planetary gear in place. However, since the planetary gears are normally urged in the forward direction by the forward rotation of the conveying roller when the sheet material is conveyed, if the wiping is performed in this state to free the planetary gears, the planetary gears may be slightly When the carriage returns, the planetary gear is not securely fixed by the drive switching arm when the carriage returns, and the planetary gear rotates during recording, and the driving force may be transmitted to the feeding unit.

Therefore, conventionally, the driving of an LF motor for rotating the transport roller forward / reversely has been controlled. That is,
As shown in FIG. 12, when the wiping is performed after the normal conveyance to the position a, the LF motor is slightly reversely driven before pulling out the drive switching arm from the planetary gear, and the force applied to the planetary gear is reduced. After wiping, wiping is performed, and the planetary gear is further fixed by the drive switching arm. Then, the LF motor is rotated forward to the position a to resume normal conveyance.

[0011]

However, in the above-described conventional ink jet recording apparatus, the difference in the starting phase of the motor and the load when the motor rotates in the reverse direction after the wiping operation during recording is different from the load in the normal conveyance. Figure 13
As shown in (2), at the time of recording after wiping has been performed, the conveyance accuracy of the sheet material may be deteriorated, and the image quality of that portion may be deteriorated. FIG. 13 shows a deviation amount of the actual transport amount with respect to a predetermined transport amount between the respective points. The horizontal axis represents the measurement point, and the vertical axis represents the deviation amount.

The present invention has been made in view of the above problems, and an object of the present invention is to improve transport accuracy after forward and reverse rotation of a transport roller in an operation such as wiping or the like, and to cause transport unevenness. An object of the present invention is to prevent a decrease in image quality.

[0013]

To achieve the above object, a typical configuration of the present invention is a conveying means for conveying a sheet material, a driving source for driving the conveying means,
Control means for controlling the driving of the driving source, wherein the driving source performs reverse rotation driving in a direction reverse to a normal rotation direction which is a conveyance direction at the time of conveying the sheet material, and then drives the sheet material before the reverse rotation. When driving forward to the position, the amount of reverse rotation driving is controlled to be divided into two or more times to perform normal rotation driving.

The driving source is a stepping motor. The motor is further driven in reverse so that the total number of reverse rotation pulses becomes a multiple of one cycle of the motor phase after the reverse rotation and before normal rotation. It is characterized in that the number of pulses is divided into two or more, and each of them is driven to rotate forward so as to be a multiple of one cycle of the motor phase.

According to the above configuration, the driving of the driving source is performed by:
For example, since the normal rotation after the reverse rotation in the operation such as wiping is divided into two or more times, further reverse rotation is performed before the normal rotation after the reverse rotation so that the total reverse rotation amount is a multiple of the motor phase, After that, the total amount of reverse rotation is divided into two or more times and each is rotated forward so that each becomes a multiple of the motor phase. Therefore, the relationship between the start phase and load of the motor after reverse rotation is almost the same as during normal sheet material conveyance. The same can be achieved, and the conveyance accuracy of the sheet material after wiping or the like can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a sheet conveying apparatus and a recording apparatus to which the present invention is applied will be specifically described with reference to the drawings. In the following embodiment, an ink-jet type recording apparatus provided with a sheet conveying apparatus to which the present invention is applied will be described as an example.

[First Embodiment] A first embodiment of a recording apparatus provided with a sheet conveying apparatus according to the present invention will be specifically described with reference to the drawings. FIG. 4 is a perspective view showing the entire configuration of the recording apparatus, FIG. 5 is a front view of the recording apparatus, and FIG. 6 is a sectional view of the configuration of the recording apparatus.

In this embodiment, an ink-jet type recording apparatus having an automatic feeding device is exemplified.
6, the recording apparatus 1 includes a feeding unit 2, a conveying unit 3, a discharging unit 4, a carriage unit 5, and a cleaning unit 6. Hereinafter, the outline will be sequentially described by dividing them into items.

(Feeding Unit) The feeding unit 2 has a configuration in which a pressure plate 21 for stacking recording paper P as a sheet material and a feeding rotating body 22 for feeding the recording paper P are mounted on a base 20. ing. The pressure plate 21 is provided with a movable side guide 23 so as to be movable.
Is regulated. The pressure plate 21 is rotatable about a rotation shaft 20 a connected to the base 20, and is urged by the urging force of the pressure plate spring 24 to the feed rotating body 22. In the portion of the pressure plate 21 facing the feed rotating body 22,
A separation pad 25 made of a material having a large coefficient of friction, such as artificial leather, for preventing double feeding of the recording paper P is provided. Further, the base 20 has a separation claw 26 for covering a corner in one direction of the recording paper P and separating the thin recording paper (plain paper or the like) P one by one.
In order to separate the thick recording paper (thick paper or the like) P in which the separation claw 26 cannot be used, a bank portion 27 integrally formed with the base 20, the separation claw 26 operates in the plain paper position, and the separation claw 26 operates in the thick paper position. A switching lever 28 for switching so as not to act, and a release cam 29 for releasing the contact between the pressure plate 21 and the feeding rotating body 22 are provided.

In the above configuration, since the release cam 29 pushes the pressure plate 21 down to the predetermined position in the standby state, the contact between the pressure plate 21 (the upper recording paper P) and the feeding rotary member 22 is released. In this state, when the driving force of the conveying roller 36 is transmitted to the feed rotating body 22 and the release cam 29 by a drive transmission system (not shown) such as a gear, the release cam 29
Since the pressure plate 21 moves away from the recording sheet P, the feeding rotary member 22 and the recording paper P come into contact with each other. Then, the recording paper P is picked up and started to be fed with the rotation of the feed rotating body 22, and the separation claw is started.
The sheets are separated one by one by 26 and sent to the transport unit 3.
Incidentally, the feed rotator 22 and the release cam 29 rotate until the recording paper P is fed into the transport section 3, and again the recording paper P and the feed rotator
Then, the driving force from the transport roller 36 is cut off in a standby state in which the contact with the roller 22 is released. The means for transmitting / cutting the driving force of the transport roller 36 will be described in the description of the cleaning unit 6.

(Conveying Unit) The conveying unit 3 as a conveying means includes:
It has a transport roller 36 for transporting the recording paper P, and a PE sensor 32 for detecting an end of the recording paper P. A pinch roller 37 that is driven and rotated is provided in contact with the transport roller 36. The pinch roller 37 is held by the pinch roller guide 30, and by urging the pinch roller guide 30 with the pinch roller spring 31, the pinch roller 37 is pressed against the transport roller 36 to generate a transport force of the recording paper P. . Further, recording paper P
An upper guide 33 and a platen 34 for guiding the recording paper P are provided at the entrance of the transport unit 3 to which the paper is fed. The upper guide 33 is provided with a PE sensor lever 35 for transmitting the detection of the front and rear ends of the recording paper P to the PE sensor 32. Further, a recording head 7 as recording means for forming an image based on image information is provided downstream of the transport roller 36 in the sheet transport direction.

In the above configuration, the recording paper P sent to the transport section 3 is composed of a platen 34, a pinch roller 30, and an upper guide 33.
And is sent to a nip portion of a transport roller pair including a transport roller 36 and a pinch roller 37. At this time, the leading end of the recording paper P is detected by the PE sensor lever 35, and the printing position of the recording paper P is obtained. The recording paper P is transported on the platen 34 by rotating the transport roller pairs 36 and 37 by an LF motor (not shown).

The recording head 7 serving as a recording means is an ink jet recording head which discharges ink in response to a signal to perform recording, and an easily replaceable ink jet recording head having a detachable ink tank. Used. The recording head 7 is provided with an electrothermal converter such as a heater for generating thermal energy for ink ejection, and the thermal energy applied by the electrothermal converter causes the ink to undergo film boiling. The ink is ejected from the nozzles (ink ejection ports) of the recording head 7 by the pressure change caused by the growth or contraction of the bubbles due to the pressure, and an image is formed on the recording paper P.

FIG. 7 illustrates a specific configuration of the recording head 7. FIG. 8 illustrates a configuration of a color recording head 7a having substantially the same outer shape as the recording head 7 shown in FIG. FIG.
In the embodiment shown in FIG. 7, the black ink tank 73a and the YMC (yellow, magenta, cyan)
a is mounted.

FIGS. 7 and 8 have substantially the same configuration except for the ink tank section, and hence the description of the recording head will be mainly made with reference to FIG. As shown in FIG. 7, the recording head 7 includes an ink tank 73 and a head unit 71. The ink tank 73 is filled with a sponge impregnated with ink. On the bottom surface of the ink tank 73, a piping section 76 for transferring ink to the head unit 71 is provided. The head unit 71 includes a plurality of nozzles having a density of 360 nozzles / inch, an electrothermal transducer (heater element), electrodes, a silicon plate electrically wired, a recording head substrate, a liquid chamber, an ink filter, and the like, on a base plate 72 made of aluminum.
An ink supply tube and the like are formed. Since the nozzle row is inclined by 1 ° to 4 ° from the vertical with respect to the scanning direction due to the driving method, the head unit 71 is attached to the ink tank 73 with an inclination.

The ink is heated by the heater element of the head unit 71, and the ink is ejected from the nozzle portion 70 of the recording head 7 by the pressure change caused by the growth or shrinkage of the bubble generated when the ink boils. Thus, an image is formed on the recording paper P.

(Discharge Unit) The discharge unit 4 as discharge means
The transmission roller 40 is provided in contact with the transport roller 36, and the transmission roller 40 is provided in contact with the discharge roller 41. Accordingly, the driving force of the transport roller 36 is transmitted to the discharge roller 41 via the transmission roller 40, and the discharge roller 41 is driven to rotate. Further, a spur 42 that is driven to rotate in contact with the discharge roller 41 is rotatably contacted with the discharge roller 41.
With the above configuration, the recording paper P on which an image has been formed by the carriage unit 5 is nipped and conveyed by the discharge roller 41 and the spur 42 and discharged to a discharge tray (not shown).

(Carriage section) The carriage section 5 as a holding means has a carriage 50 on which the recording head 7 is mounted. The carriage 50 has a guide shaft for reciprocating scanning in a direction orthogonal to the conveying direction of the recording paper P.
81 and a guide rail 82 that holds the rear end of the carriage 50 and maintains a gap between the recording head 7 and the recording paper P.

The guide shaft 81 and the guide rail 82
Is attached to the chassis 8. Also, the carriage
50 is driven through a timing belt 83 by a carriage motor 80 attached to the chassis 8. The timing belt 83 is stretched and supported by an idle pulley 84. Further, the carriage 50 is mounted on the electric board 9.
And a flexible substrate 56 for transmitting a head signal to the recording head 7.

In the above configuration, when an image is formed on the recording sheet P, the conveying roller pair 36, 37 conveys the recording sheet P to the line position (position in the conveying direction of the recording sheet P) where the image is to be formed, and the carriage The carriage 50 is moved by the motor 80 to the row position where the image is formed (the position orthogonal to the transport direction of the recording paper P), and the recording head 7 is opposed to the image forming position.
Thereafter, the recording head 7 ejects ink toward the recording paper P in response to a signal from the electric substrate 9 to form an image.

(Cleaning unit) The cleaning unit 6
A pump 60 for cleaning the recording head 7, a cap 61 for suppressing drying of the recording head 7, and a wiper for scraping dust and ink attached to the ejection surface of the recording head 7
66 and the driving force from the conveying roller 36 to the feeding unit 2 or the pump.
And a drive switching arm 62 for switching to 60.

The cap 61 is mounted on the cylinder of the pump 60 as shown in FIG. 9, and the cylinder is rotatable about the cylinder rotation shaft 64 and is urged by the cylinder spring 65. When the cap 61 is not capping, the cap 61 is on standby (in a state shown in FIG. 9). The carriage 50 on which the recording head 7 is mounted has an arrow A
When it moves in the direction, the protrusion provided on the cylinder portion is pressed, and the tip of the cap 61 rotates substantially in synchronization with the ejection surface (nozzle portion) of the recording head 7, so that the cap 61 covers the ejection surface. And the capping is completed.

The drive switching arm 62 fixes the planetary gear 38, which rotates about the axis of the transport roller 36, at a predetermined position except for the feeding / cleaning operation. No driving force is transmitted to the motor (see FIG. 10). Also,
When the drive switch arm 62 is moved in the direction of arrow A in FIG. 6 by moving the carriage 50, the planetary gear 38 becomes free.
The driving force is transmitted to the feeding unit 2 when the conveyance roller 36 rotates forward (see FIG. 11), and the pump rotates when the conveyance roller 36 rotates reversely.
The driving force is transmitted to 60.

Therefore, when the conveying roller 36 rotates in the reverse direction while the ejection surface (nozzle portion) of the recording head 7 is capped, the cam in the pump 60 rotates and a negative pressure is generated in the cap 61, and ink from the nozzle is ejected. Absorbed ink in the nozzles is absorbed and ink is filled in the nozzles.

During recording, wiping is periodically performed to remove dust, ink, and the like attached to the ejection surface of the recording head 7. Specifically, during recording, the carriage 50 on which the recording head 7 is mounted reciprocates on a wiper 66 made of an elastic member such as rubber, and dust on the ejection surface of the recording head 7 is formed at an edge of the wiper 66. And scrape off the ink.

At this time, when the carriage 50 moves in the direction of the arrow A in FIG. 9 for wiping, the drive switching arm 62 comes off the planetary gear 38 to make the planetary gear 38 free, and the carriage 50 moves to the original position before the movement. Then, the drive switching arm 62 fixes the planetary gear 38. However, since the planetary gear 38 is normally urged in the forward direction by the forward rotation of the conveying roller 36 when the recording paper P is conveyed, if the wiping is performed in this state to make the planetary gear 38 free, in some cases, Planetary gear
When the carriage 50 returns to the original position, the carriage 38 is not fixed as shown in FIG. 10 and the driving force may be transmitted to the feeding unit 2 during recording.

For this reason, the drive of an LF motor (not shown), which is a drive source for driving the transport roller 36 to rotate forward / reverse, is controlled. Here, first, the configuration of the control unit in the present apparatus will be briefly described with reference to FIG. 3, and then, one mode of operation control during wiping will be described with reference to FIGS. 1 and 2.

In this embodiment, a four-phase stepping motor is used as the LF motor as a drive source for driving the transport roller 36, and the LF motor is used for wiping by an apparatus using the motor. The operation is illustrated.

The LF motor is a 48-step stepping motor, and performs a constant voltage two-phase drive.
This LF motor is configured such that the transport amount by one pulse corresponds to one dot of recording.

First, the configuration of the control unit will be briefly described. In FIG. 3, reference numeral 91 denotes a control unit, which is a CPU 91a,
It comprises a ROM 91b and a RAM 91c. The CPU 91a is a central processing unit (central processing unit) that reads programs and various data from a ROM 91b and the like described below, performs necessary calculations and determinations, outputs various control signals according to a control program, and controls driving of the entire apparatus. Is what you do. The ROM 91b is a read-only storage device, and stores various programs and various data for operating the CPU 91a. The RAM 91c is a constant speed call storage device (rand
om access memory), a working area in which the CPU 91a temporarily stores data in instructions and operation results.
It consists of a text area for storing various data.

An LF motor 93, which is a drive source for driving each roller, is provided to the control unit 91 via an interface 92.
A CR motor (carriage motor) 80 for moving a carriage 50 on which the recording head 7 is mounted is connected via motor drivers 94 and 95. Similarly, the recording head 7 is connected via a head driver 96.
Accordingly, the driving of the LF motor 93, the CR motor 80, and the recording head 7 is controlled by the control unit 91.

Next, operation control during wiping by the control unit will be described. As shown in FIG.
When the wiping instruction is input when the normal sheet conveyance has been performed up to this point, the LF motor is first driven in reverse rotation by 10 pulses. The reverse drive of these 10 pulses is performed by the planetary gear 38.
This is to loosen the force (biasing force in the normal rotation direction) applied to. Then, at the position b where the LF motor is reversely driven by 10 pulses, the carriage motor 80 is driven to move the carriage 50 on which the recording head 7 is mounted in the direction of arrow A in FIG.

After the above-described wiping, the LF motor is further driven in the reverse direction by a further six pulses to position c so that the total amount of the reverse drive becomes a positive multiple of four pulses, which is one cycle of the LF motor. Thereafter, the total of 16 pulses, which is the total amount of reverse rotation, is divided, the forward rotation is performed twice by 8 pulses, and the sheet is returned to the position a before the reverse rotation, and the normal sheet conveyance is restarted.

More specifically, the LF motor is controlled so as to temporarily stop between the divided forward drive and forward drive when the forward drive is performed by dividing the reverse drive amount into two or more times. ing. Specifically, as shown in FIG. 1, after performing the normal rotation drive of 8 pulses from the position c, the control is performed so as to temporarily stop at the position d and perform the normal rotation drive of the 8 pulses again to the position a. I have.

The amount of sheet conveyance in this apparatus differs depending on the recording mode and recording head, and includes 128 dots, 64 dots, 32 dots, 24 dots, 16 dots, and 8 dots.

In the LF motor, one forward rotation amount after the reverse rotation is set to be equal to or smaller than a positive number by one conveyance amount of the recording paper P, and in this embodiment, one rotation of the motor is performed in one cycle of the motor. The number of pulses is eight, which is twice as large as a certain four pulses. Therefore, as described above, by returning to the position a by two forward rotations after the reverse rotation, the relationship between the start phase and the load of the motor due to the reverse rotation can be made substantially equal to the state before the reverse rotation.

That is, by controlling the driving of the LF motor at the time of wiping as described above, the transfer accuracy after the forward and reverse rotation of the transfer roller 36 becomes as shown in FIG. The post-transfer accuracy is improved, and a high-quality image without conveyance unevenness can be obtained.

[Other Embodiments] In the above-described first embodiment, the normal rotation after the reverse rotation of 16 pulses is performed twice by 8 pulses, but the present invention is not limited to this. May be performed four times, four pulses at a time. Position b ~
The number of reverse rotation pulses during c may be 14 pulses, and the number of forward rotations may be 3 times 8 pulses or 2 times 12 pulses. still,
Also in this case, the forward drive after the reverse rotation of the LF motor is controlled so as to temporarily stop between the divided forward drive and the forward drive. That is, the forward rotation of the LF motor after the reverse rotation is performed by rotating forward by the divided predetermined pulses (8 or 12 pulses in the above example), temporarily stopping, and then rotating forward by the divided predetermined pulses again. It is repeated. By doing so, the conditions are increased, and the applicable range is expanded in other configurations.

In the above-described embodiment, an example is shown in which the present invention is applied to a recording apparatus using a serial type recording head that performs recording while operating in the width direction of a sheet material.
The present invention is not limited to this. For example, the present invention can be effectively applied to a recording apparatus using a full-line type recording head having a length corresponding to the maximum width of a sheet material that can be recorded by the recording apparatus. Such a recording head may have a configuration that satisfies the length by combining a plurality of recording heads, or a configuration as a single recording head that is integrally formed.

In addition, even in the case of the above-mentioned serial type, the recording head fixed to the carriage or mounted on the carriage enables electrical connection with the apparatus main body and supply of ink from the apparatus main body. A replaceable chip type recording head or a cartridge type recording head in which an ink tank is provided integrally with the recording head itself may be used.

Regarding the type and number of recording heads mounted on the carriage, for example, only one recording head is provided corresponding to a single color ink, and a plurality of inks having different recording colors and densities are supported. May be provided in plurality. That is, for example, the printing mode of the printing apparatus is not limited to a printing mode of only a mainstream color such as black, and may be a printing head integrally configured or a combination of a plurality of printing heads. Alternatively, the present invention can be applied to an apparatus provided with at least one of full colors by color mixing.

Further, as the form of the above-mentioned ink jet recording apparatus, in addition to a form used as an image output terminal of an information processing apparatus such as a computer, a form of a copying apparatus combined with a reader or the like, and a form of a facsimile apparatus having a transmitting / receiving function. It may be something to be taken.

In the above-described embodiment, an example in which the ink jet recording system is used as the recording means has been described. However, the recording system of the present invention does not need to be limited to the ink jet recording system. A recording method such as a recording method such as a wire dot recording method or any other recording method can be applied.

[0054]

As described above, according to the present invention,
By improving the method of forward / reverse drive of the motor, for example, the transport accuracy after forward / reverse rotation of the transport roller in an operation such as wiping performed while forming an image on a recording medium is improved, and there is no transport unevenness. High quality images can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an operation at the time of wiping according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of conveyance accuracy according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a schematic configuration of a control unit.

FIG. 4 is a perspective view illustrating the overall configuration of the recording apparatus.

FIG. 5 is a front view of the recording apparatus.

FIG. 6 is a configuration sectional view of the recording apparatus.

FIG. 7 is an outline view of a monochrome head.

FIG. 8 is an outline view of a color head.

FIG. 9 is a front view illustrating a schematic configuration of a cleaning unit.

FIG. 10 is a diagram when the planetary gear is not meshed with the feeding unit.

FIG. 11 is a diagram when the planetary gear is engaged with the feeding unit.

FIG. 12 is an explanatory diagram of an operation at the time of conventional wiping.

FIG. 13 is an explanatory diagram of conventional transport accuracy.

[Explanation of symbols]

 P ... Recording paper 1 ... Recording device 2 ... Feeding unit 3 ... Conveying unit 4 ... Ejecting unit 5 ... Carriage unit 6 ... Cleaning unit 7,7a ... Recording head 8 ... Chassis 9 ... Electrical board 10 ... Front cover 10a ... Round groove 10b ... convex rib 10c ... notch 10 10d ... rib 10d 11 ... body cover 20 ... base 20a ... rotating shaft 21 ... pressure plate 22 ... feeding rotary body 23 ... movable side guide 24 ... pressure plate spring 25 ... separation pad 26 ... separation claw 27 ... Embankment 28 ... Switching lever 29 ... Release cam 30 ... Pinch roller guide 31 ... Pinch roller spring 32 ... PE sensor 33 ... Upper guide 34 ... Platen 34a ... U groove 35 ... PE sensor lever 36 ... Transport roller 37 ... Pinch roller 38 planetary gear 40 transmission roller 41 discharge roller 42 spur 50 carriage 50a protrusion 56 flexible substrate 60 pump 61 cap 62 drive switching arm 70 nozzle 71 head unit 72 base plate Ports 73, 73a Ink tank 76 Pipe section 80 Carriage motor 81 Guide shaft 82 Guide rail 83 Timing belt 84 Idle pulley 91 Control section 91a CPU 91b ROM 91c RAM 92 Interface 93 LF motor 94,95 ... motor driver 96 ... head driver

Claims (10)

[Claims] A transport unit configured to transport the sheet material; a drive source configured to drive the transport unit; and a control unit configured to control a drive of the drive source. When the sheet material is conveyed in the reverse direction opposite to the normal direction, which is the conveying direction, and when the sheet material is driven forward to the original position before the reverse rotation, the reverse drive amount is divided into two or more times. A sheet material conveying device controlled to perform forward rotation driving. 2. The method according to claim 1, wherein the drive source temporarily stops between the divided forward drive and the forward drive when the reverse drive amount is divided into two or more times and the forward drive is performed. Item 2. The sheet material conveying device according to Item 1. 3. The sheet conveying apparatus according to claim 1, wherein the driving source is a stepping motor. 4. The motor is further driven in reverse direction such that the total number of reverse rotation pulses becomes a multiple of one cycle of a motor phase before and after normal rotation after reverse rotation, and thereafter, the total number of reverse rotation pulses is divided into two or more times. 4. The sheet conveying apparatus according to claim 3, wherein each of the plurality of motors is driven to rotate forward so as to be a multiple of one cycle of the motor phase. 5. The motor according to claim 4, wherein the forward rotation amount of the motor after the reverse rotation is equal to or smaller than a positive number by one transport amount of the sheet material. Sheet material transport device. 6. A recording apparatus comprising: a conveying unit for conveying a recording medium; and a holding unit for detachably holding a recording unit for recording an image on the recording medium, wherein the conveying unit is used as the conveying unit. A recording apparatus, comprising the sheet material conveying apparatus according to any one of claims 1 to 4. 7. The printing apparatus includes a cleaning unit having a wiper for removing foreign matter such as dust adhering to the printing unit, and the driving source is configured to rotate the sheet material in a forward direction before wiping. The reverse rotation amount is controlled so that the reverse rotation amount is divided into two or more times and the normal rotation drive is performed when performing the reverse rotation drive in the direction opposite to the direction and performing the forward rotation to the original position before the reverse rotation after wiping. The recording apparatus according to claim 6, wherein 8. The recording apparatus according to claim 6, wherein said recording apparatus is of an ink jet recording type in which recording means performs recording by discharging ink according to a signal. 9. The recording apparatus according to claim 8, wherein said recording apparatus includes an electrothermal converter for generating thermal energy for discharging ink. 10. The recording apparatus according to claim 9, wherein the recording means discharges the ink from the discharge port by utilizing film boiling generated in the ink by the thermal energy applied by the electrothermal transducer. The recording device according to claim 1.