JP2821287B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus for recording by transporting a recording medium, and more particularly, to a recording apparatus in which the contact pressure of a transport member on the recording medium is changed.

[0002]

2. Description of the Related Art Various recording methods have been developed for use in electronic typewriters and printers. Among them, the ink jet recording method has been widely used in recent years because the apparatus can be easily simplified and downsized.

In general, in ink-jet printing, as shown in FIG. 9, a pair of transport rollers 52a, 52 is provided on the upstream side in the transport direction of a recording medium 51 around a recording position by a recording head 50.
b, and a pair of discharge rollers 53a and 53b are provided on the downstream side. This apparatus discharges ink in response to an image signal while moving a carriage 54 on which a recording head 50 is mounted on a recording medium 51 held by a pair of conveying rollers 52a and 52b and a pair of discharging rollers 53a and 53b in a roller axis direction. Then 1
Record lines.

[0004] During the recording (during the forward movement of the recording head 50), the recording medium 51 is stopped, and while one-line recording is completed and the recording head 50 returns to the home position (during the backward movement of the recording head 50). Then, the respective roller pairs 52a, 52b, 53a, 53b are driven to convey and stop the recording medium 51 by a predetermined amount, and the subsequent recording is performed in the same manner to obtain an image as desired.

[0005]

In the above-mentioned ink jet recording, a discharge roller pair located downstream of a recording position is used.
53a and 53b may be gradually contaminated with ink. In particular, since the upper discharge roller 53b that comes into contact with the recording surface comes into contact with the recording surface immediately after recording, the ink is easily transferred when the ink ejected on the recording medium 51 is incompletely dried and has a large amount of water. .

The discharge roller pair 53a, 53b is a recording head.
While the 50 is moving forward and recording one line, the stopped recording medium 51 is nipped. For this reason,
When the contamination of the upper discharge roller 53b proceeds, the recording medium 51
While the sheet is held, the contaminated ink on the discharge upper roller 53b is re-dissolved by the ink moisture on the recording surface, and the contaminated ink is re-transferred to the recording medium 51, and the recording surface becomes a stripe (roller marks).
Would be dirty.

Further, when the contamination of the upper discharge roller 53b progresses, the contaminated ink is transferred to the opposing lower discharge roller 53a, and a grip force for conveying the recording medium 51 cannot be obtained, thereby causing a slip. There is.

[0008] Today, as a recording medium 51 used for ink jet recording, a thin resin sheet (such as an OHP sheet) or a woven cloth has been used in addition to commonly used paper.
In addition to cut sheets, roll sheets for long recording are also used. Since such a resin thin plate or woven cloth requires a long drying time of the ink, the ink easily transfers to the discharge upper roller 53b, and the discharge roller pair 53
a and 53b are easily contaminated.

Further, in the case of full-color recording, a recording medium
Since the amount of ink ejected to the same location 51 increases, the ink contamination is more likely to occur.

In order to prevent the discharge roller pair 53a, 53b from being contaminated with ink, the upper discharge roller 53b is divided in the axial direction so that the upper discharge roller 53b in the recording area of the recording medium 51 does not contact the recording medium 51. In addition, a configuration has been proposed in which only the upper discharge roller 53b outside the recording area contacts the recording medium 51. However, the size of the recording medium 51 is not constant, and the contact pressure balance and the like must be taken into consideration when the divided upper discharge rollers 53b are independently moved toward and away from the recording medium 51, and the apparatus is complicated. And it becomes large. In such a case, the discharge roller pair 53a, 53
If the holding area of the recording medium 51 by b is small, a stable conveying force cannot be obtained, and as a result, a large margin is required at the end of the recording medium 51.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to prevent image contamination due to ink contamination of a conveying member downstream of a recording position and prevent poor conveyance to prevent high-quality images. It is an object of the present invention to provide a recording apparatus capable of performing the recording of the information.

[0012]

A representative means of the present invention for solving the above problems is a recording means for performing recording on a recording medium, and a recording medium upstream of a recording position by the recording means in a transport direction of the recording medium. A first transport member that transports the recording medium, a second transport member that is disposed downstream of the recording position of the recording unit in the transport direction of the recording medium, and transports the recording medium, and a pressure switching means for switching the contact pressure of the second conveying portion village, the
When the recording medium is conveyed by the second conveyance member and when the conveyance is stopped
Cut off the contact pressure of the second transport member against the recording medium
It is characterized by having been changed .

[0013]

In the above means, the contact pressure of the second conveying member which contacts the recording medium after recording is changed by the recording medium during recording.
When the ink is stopped, it is weak or separated, so that the ink transferred to the recording medium is less likely to be transferred to the second transport member, and ink contamination is reduced.

[0014]

Next, an embodiment of the present invention to which the above-mentioned means is applied will be described.

[First Embodiment] FIG. 1 is a sectional explanatory view of a recording apparatus, and FIG. 2 is a constitutional explanatory view of a recording means. This recording device, as shown in FIG.
The recording media 2 stacked in the cassette 1 are fed one by one by a pickup roller 3, transported by a transporting unit 4, and reciprocated by a recording unit 6 with respect to a recording medium whose back surface is supported by a platen 5. The recording medium 2 is moved and recorded, and the recorded recording medium 2 is discharged to the discharge tray 7.

In this recording apparatus, as described later, the upper discharge roller 4d can swing with respect to the lower discharge roller 4c, and the pressure switching means 8 can change the contact pressure between the two rollers 4c and 4d. I have.

Next, the configuration of each section will be specifically described.

(Conveying Means) As shown in FIG. 1, the conveying means 4 is disposed upstream of the recording position in the recording medium conveying direction, and is a conveying roller as a first conveying member for conveying the recording medium 2 to the recording position. Pairs 4a, 4b
And a second transport member that is disposed downstream of the recording position and discharges the recording medium 2 after recording to the discharge tray 7.
Discharge roller pair 4c of constitute between 4d. The lower transport roller 4a and the lower discharge roller 4c are rotatable in connection with a transport motor 4e, and the upper transport roller 4b and the upper discharge roller 4d are arms 4h, 4i rotatable about shafts 4f, 4g, respectively. And the arms 4h,
The roller 4a is pressed against the lower conveying roller 4a and the lower discharging roller 4c by tension springs 4j and 4k locked to the lower roller 4i. Thus, when the transport motor 4e is driven, the recording medium 2 is transported in the direction of arrow a in FIG.

When the recording medium is conveyed, the lower discharge roller 4c rotates at a slightly higher peripheral speed than the lower conveyance roller 4a to apply tension to the recording medium 2 so that the recording medium 2 at the recording position is not slackened. ing. Even when the speed difference is set in this manner, the nipping force of the recording medium 2 is
Since the recording rollers 2a and 4b are set stronger than the discharge roller pairs 4c and 4d, the recording medium 2 is controlled by the rotation peripheral speed of the lower conveying roller 4a.

(Recording Means) The recording means 6 is for recording an ink image on the recording medium 2 conveyed by the conveying means 4, and this apparatus reciprocates a carriage 6a as shown in FIG. The ink jet recording method uses a serial ink jet recording method in which an ink liquid is ejected from the recording medium.

The carriage 6a is connected to an endless timing belt 6d bridged between a driving pulley 6b and a driven pulley 6c, and reciprocates along a guide rail 6f when the carriage motor 6e connected to the driving pulley 6b is driven forward and backward. I do.

The carriage 6a has four recording heads 6g integral with the ink tank.
The color recording is performed on the recording medium 2 by discharging four color inks of yellow, magenta, cyan, and black in accordance with an image signal during the forward movement of a.

The recording head 6g generates a fine liquid discharge port (orifice), a liquid passage, an energy acting portion provided in a part of the liquid passage, and a droplet forming energy acting on the liquid in the acting portion. It has energy generating means. As an energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, and irradiating electromagnetic waves such as a laser to generate heat,
A recording method using energy generating means for discharging liquid droplets by the action of the heat generation, or recording using energy generating means for discharging liquid by heating liquid by an electrothermal converter such as a heating element having a heating resistor. There are methods. 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 ports (orifices) for ejecting recording droplets and forming ejection droplets. Therefore, high-resolution recording can be performed. Among them, a recording head using an electrothermal transducer as an energy generating means can be easily made compact, and has recently made remarkable progress in technology and reliability in the semiconductor field.
We can make full use of the advantages of C technology and micromachining technology,
This is advantageous because high-density mounting is easy and the manufacturing cost is low.

During recording by the recording head 6g, the back side of the recording medium 2 is supported by a platen 5. The platen 5 adheres the recording medium 2 by electrostatic attraction, air suction, or an adhesive. It may be configured to hold the recording medium 2 so as not to float from the platen 5.

(Pressure Switching Means) The pressure switching means 8 is for switching the contact pressure between the pair of discharge rollers 4c and 4d. As shown in FIG. 1, one end of an eccentric cam 8b rotatable by a pressure motor 8a is provided. Abuts against the other end of the arm 4i holding the upper discharge roller 4d,
It is provided so that it can be separated.

Therefore, as shown by the solid line in FIG.
When the roller is separated from the arm 4i, the upper discharge roller 4d
Is the lower discharge roller 4 by the tensile force of the tension spring 4k.
When the cam 8b rotates and pushes down the arm 4i, the pressure contact force decreases. When the cam 8b further rotates, the upper discharge roller 4d becomes the lower discharge roller as shown by the two-dot chain line in FIG. 4c completely separated. That is, by driving the pressing motor 8a, the roller pair 4c, 4d
Is switched (including the case where the upper discharge roller 4d is separated).

In this embodiment, when the recording medium 2 is conveyed, the discharge roller pairs 4c and 4d are pressed against each other, and the recording medium 2 is conveyed during recording.
Is stopped, the upper discharge roller 4d is separated from the lower discharge roller 4c.

(Control means) Next, a control system for driving the above-described units will be described with reference to FIG. In FIG. 3, reference numeral 9 denotes a control unit,
It comprises a PU 9a, a ROM 9b, and a RAM 9c.

The CPU 9a is a central processing unit that reads programs and various data from an external device 10 such as a ROM 9b and an input device, which will be described later, performs necessary calculations and determinations, and performs various controls.

The ROM 9b is a read-only memory and stores various programs required for the operation of the CPU 9a, for example, various programs shown in the flowchart of FIG. 4, character codes, and various data necessary for dot pattern recording.

The RAM 9c is a read / write memory. The RAM 9c has a working area for temporarily storing data and a calculation result in the CPU 9a, a buffer area for storing various data input from the external device 10 and the like, and a document. It consists of a text area to save.

The control section 9 inputs an image signal from an external device 10 via an interface 11 and also inputs various information from the operation section 12, for example, information regarding a recording density, the number of recordings, a recording size, and the like. The control section 9 outputs a drive signal to a motor driver 13 for controlling the driving of each motor (the transport motor 4e, the carriage motor 6e, the pressurizing motor 8a, etc.) via the interface 11, and controls the drive of the recording head 6b. An image signal or the like is output to the head driver 14 to drive each member.

(Printing Operation) Next, the operation of each unit when printing is performed by the printing apparatus having the above configuration will be described with reference to FIGS. 4 and 5, focusing on the movement of the upper discharge roller 4d. FIG. 4 is a flowchart showing a recording operation procedure, and FIGS. 5A and 5B are explanatory diagrams showing the movement of the upper discharge roller 4d during the recording operation.

First, as shown in the flowchart of FIG. 4, the conveying motor 4e is driven by a predetermined amount to feed the recording medium 2 to the recording position (S1), and the first line of recording is performed. The eccentric cam 8b is rotated by driving the motor 8a by a predetermined amount (S2), and the upper discharge roller 4d is separated from the lower roller 4c as shown in FIG.

In this state, the carriage motor 6e is driven to rotate forward to move the carriage 6a forward, and ink is ejected from the recording head 6g to perform one-line recording (S3).

Next, if there is a next line recording (S4), the carriage motor 6e is driven in reverse to move the carriage 6a backward, and at the same time, the pressure motor 8a is driven by a predetermined amount to lower the upper discharge roller 4d. The recording medium 2 is conveyed by one line by driving the conveyance motor 4e by a predetermined amount (S6). That is, as shown in FIG. 5B, the eccentric cam 8b is separated from the arm 4i, and the discharge roller pair 4c, 4d
Rotates while nipping the recording medium 2. At this time, as described above, the rotational peripheral speed of the discharge lower roller 4c is slightly higher than the rotational peripheral speed of the transport lower roller 4a, so that the recording medium 2 is transported in tension at the recording position. As a result, even if the recording medium 2 that has absorbed the ink expands, the recording medium 2 at the recording position does not loosen or wrinkle.

After the recording medium 2 has been conveyed by one line as described above, the flow returns to step S2 to move the upper discharge roller 4d to the position shown in FIG.
As shown in (a), the next line is recorded again with the separation. By repeating this, a desired image is recorded on the recording medium 2.

If there is no next-row recording in step S4, the process proceeds to steps S7 and S8, where the discharge rollers 4c and 4d pinch the recording medium 2 and rotate to discharge the recording medium 2 to the discharge tray 7. .

As described above, the upper discharge roller 4d, which is downstream of the recording position and in contact with the recording surface, is brought into contact with the recording medium 2 only during conveyance, and during the recording operation in which the recording medium 2 is stopped, By separating the ink from the roller 2, the ink adhering to the upper discharge roller 4d is not redissolved, so that it is possible to prevent image contamination due to retransfer of the ink. Therefore, a high-quality image can be recorded even on a resin thin plate or a woven fabric that requires an ink drying time.

Further, in the recording configuration, the recording medium 2
It is also convenient when a roll sheet is used.

That is, when a roll sheet is used as a recording medium, skewing occurs due to expansion and contraction of the recording medium due to uneven image density or the like, and ink may be ejected directly to the platen. However, when the upper discharge roller 4d is separated from the recording medium 2 during recording as shown in FIG. 6, even if a part of the recording medium 2 expands and contracts, the recording medium 2 is in a free state downstream from the recording position. Stretch freely.
At this time, on the upstream side of the recording position, the conveying roller pair 4a,
Since the recording medium 2 is securely held by 4d, no deviation occurs in the recording medium 2.

Therefore, even if a roll sheet is used as the recording medium 2 and it expands and contracts, the upper discharge roller 4d is separated from the recording medium 2 to cause the recording medium 2 to float and wrinkle due to the expansion and contraction. The recording medium 2 can be conveyed without causing the recording medium 2 to be skewed, thereby performing high-quality recording.

[Second Embodiment] In the above-described first embodiment, an example in which the contact pressure of the upper discharge roller 4d with respect to the recording medium 2 is switched in two stages (pressing and separating) has been described. An example of switching the pressure in four stages will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals.

The construction of the pressure switching means 15 in this embodiment is such that an upper discharge roller 4d is mounted on one end of an arm 15b rotatable about a shaft 15a, and a tension spring is mounted on the other end.
A discharge upper roller 4d is urged by the spring 15c in a direction away from the lower roller 4c.

A leaf spring 15d is mounted on the upper part of the arm 15b. An eccentric cam 15e contacts the leaf spring 15d, and the cam 15e is rotated in four stages by a pressurizing motor 15f. , P, Q, R. When the cam 15e pushes the leaf spring 15d, the upper discharge roller 4d comes into pressure contact with the lower discharge roller 4c via the elasticity of the leaf spring 15d. At this point, the cam 15e is
d, the upper discharge roller 4d is separated from the lower discharge roller 4c, and the cam 15e is moved by the leaf spring 15d at points P, Q and R.
, The rollers 4c and 4d come into pressure contact with each other. In this case, when the contact is made at the point Q, the contact is made with the strongest force,
When the contact is made at the points P and R, the contact is made with a weaker force.

A transport motor 4e is attached to the lower discharge roller 4c.
A driving force is transmitted from another discharge motor 16 via a torque limiter 17 to rotate. Incidentally, the transmission torque of the torque limiter 17 is determined by the transport roller pair 4a, 4a.
b is smaller than the holding force of the recording medium 2
Is stopped between the pair of transport rollers 4a and 4b, the slippage occurs in the torque limiter 17, and the lower discharge roller 4c does not rotate.

Next, the operation of each unit when recording is performed by the recording apparatus having the above-described configuration will be described with reference to FIGS. 7 and 8, focusing on the movement of the upper discharge roller 4d. Note that FIG.
8A to 8D are explanatory views showing the movement of the upper discharge roller 4d during the printing operation, and FIG. 8 is a flowchart showing the printing operation procedure.

First, the transport motor 4e and the discharge motor 16 are driven to feed the recording medium 2 to the recording position (S21). At this time, the eccentric cam 15e is in contact with the leaf spring 15d at the point Q as shown in FIG. When the recording medium 2 reaches the recording position, only the transport motor 4e stops driving (S2
2) The eccentric cam 15e rotates so as to contact the leaf spring 15d at the point P as shown in FIG. 7B (S23), and the carriage 6a moves forward to perform one-line recording (S24).

At this time, the discharge motor 16 remains driven, but the recording medium 2 is in a stopped state because the transport roller pair 4a, 4b is stopped, and tension is applied by the torque of the torque limiter 17, Thereby, the elongation of the recording medium 2 in the transport direction is removed.

During recording, the upper discharge roller 4d is in contact with the recording medium 2 with a weak contact pressure.
Since d is driven, there is no slip between the recording surface and the transfer of ink.

When one-line printing is completed by the forward movement of the carriage 6a, the driving of the discharge motor 16 is stopped (S25), and the cam 15e is moved to the leaf spring 15d at the position of the point O as shown in FIG. The upper roller 4d is rotated so as to be in contact with the recording medium 2 and is separated from the recording medium 2 (S26).
Is returned (S27).

At this time, since the recording medium 2 becomes free on the downstream side of the recording position, the recording medium 2 expands and contracts freely, and the distortion in the width direction of the recording medium is also eliminated.

Next, as shown in FIG. 7D, the cam 15e rotates so as to contact the leaf spring 15d at the position of the point R, and the upper discharge roller 4d is pressed against the recording medium 2 weakly (S28). The motor 16 is driven (S29). As a result, tension is again applied to the recording medium 2 once in the free state, and floating and slack are removed.

At this time, since the contact pressure of the upper discharge roller 4d against the recording medium 2 is weak, ink transfer from the roller 4d to the recording surface does not occur.

Next, as shown in FIG. 7A, the cam 15e rotates so as to contact the leaf spring 15d at the position of the point Q (S3).
0), the recording medium 2 is set in a transportable state. Then, it is determined whether or not there is the next line recording (S31). If there is the next line recording, the conveyance motor 4e is driven by a predetermined amount to convey the recording medium 2 by one line (S32), and the process returns to step S22. Execute the recording below the next line. On the other hand, if there is no next-row recording, the flow shifts to step S33 to eject the recording medium 2.

As described above, even when the recording is performed by switching the pressure of the discharge roller pair 4c, 4d to four levels by the pressure switching means 15, as in the first embodiment, the transport failure and the recording failure are eliminated and the high level is achieved. The quality can be recorded.

[Other Embodiments] In the above-described embodiment, the ink jet recording system was used as the recording means. However, an electric current was supplied to the electrothermal converter in accordance with a recording signal, and the heating exceeded the nucleate boiling by the electrothermal converter. It is further preferable that the recording is performed by discharging the ink from the discharge port by the growth of the generated bubble.

Regarding the typical structure and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4,740,796. This method can be applied to both the so-called on-demand type and the continuous type. In particular, in the case of the on-demand type, it is arranged corresponding to a sheet or a liquid path holding a liquid (ink). By applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise above nucleate boiling to
This is effective because heat energy is generated in the electrothermal transducer, thereby causing film boiling on the heat-acting surface of the recording head. As a result, bubbles in the liquid corresponding to this drive signal one-to-one can be formed. The liquid is ejected through the ejection opening by the growth and contraction of the bubble to form at least one droplet. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are immediately and appropriately performed, so that particularly excellent liquid ejection can be achieved, which is more preferable.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable.

Further, if the conditions described in US Pat. No. 4,313,124 of the invention relating to the temperature rise rate of the heat acting surface are adopted, more excellent recording can be performed.

As the configuration of the recording head, in addition to the combination of the discharge port, the liquid path, and the electrothermal converter (linear liquid flow path or right-angle liquid flow path) as disclosed in the above-mentioned respective specifications, The present invention also includes a configuration using U.S. Pat. Nos. 4,558,333 and 4,459,600 which disclose a configuration in which a heat acting portion is arranged in a bending region.

Japanese Unexamined Patent Application Publication No. 59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal transducer for a plurality of electrothermal transducers, or an aperture for absorbing pressure waves of thermal energy. Unexamined Japanese Patent Application Publication No.
The effect of the present invention is effective even in a configuration based on JP-A-59-138461. That is, according to the present invention, the recording can be performed reliably and efficiently regardless of the form of the recording head.

Further, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium on which a recording apparatus can record.

Such a recording head may have a configuration satisfying its length by a combination of a plurality of recording heads, or a configuration as a single recording head formed integrally.

In addition, even in the case of the serial type described above, 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.

It is preferable to add recording head recovery means, preliminary auxiliary means, and the like provided as components of the recording apparatus of the present invention since the effects of the present invention can be further stabilized. Specific examples include capping means for the recording head, cleaning means, pressurizing or suction means, preheating means using an electrothermal conversion type or another heating element or a combination thereof,
Performing a preliminary ejection mode in which ejection is performed separately from printing is also effective for performing stable printing.

The type and number of recording heads mounted on the carriage are, for example, not only those provided for one color ink but also a plurality of inks having different recording colors and densities. 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 combination of a plurality of print heads integrally formed. To at least one of the full-color devices.

In addition, in the above-described embodiment, the ink is described as a liquid. However, an ink which solidifies at room temperature or lower and which softens or liquefies at room temperature, or an ink jet recording system 30 ink itself
It is common to control the temperature so that the viscosity of the ink is in the stable ejection range by adjusting the temperature within the range of not less than 70 ° C and not more than 70 ° C if the ink is in a liquid state when the use recording signal is applied. good. In addition, positively prevent the temperature rise due to thermal energy by using it as energy for changing the state of the ink from a solid state to a liquid state, or use an ink that solidifies in a standing state to prevent evaporation of the ink. In any case, the ink is liquefied by the application of the heat energy according to the recording signal, and the ink is liquefied, and the liquid ink is discharged. The present invention is also applicable to a case where an ink that liquefies for the first time by energy is used.

The ink in such a case is disclosed in JP-A-54-5
No. 6847 or Japanese Patent Application Laid-Open No. Sho 60-71260, in which the porous sheet is opposed to the electrothermal converter in a state of being held as a liquid or solid substance in the concave portion or through hole of the porous sheet. It is good. The most effective one for each of the above-mentioned inks is to execute the above-described film boiling method.

Further, as the form of the ink jet recording apparatus described above, in addition to those used as image output terminals of information processing equipment such as computers, copying apparatuses combined with readers and the like, and facsimile apparatuses having a transmission / reception function are also available. It may take a form.

Although an example in which an ink jet recording method is used as the above-described recording means has been described, the present invention does not need to limit the recording method to the ink jet recording method. Can be applied to a recording method other than the impact recording method such as the wire dot recording method. It is not necessary to limit to the serial recording method, and a so-called line recording method may be used.

[0072]

According to the present invention, as described above, the recording means
The second transport section downstream of the recording position in the transport direction of the recording medium
The pressure at which the material comes in contact with the recording medium
By switching between when the conveyance is stopped, the ink attached to the conveyance member can be prevented from transferring to the recording surface,
A high-quality image free from image contamination can be recorded.

Even when a recording medium having high elasticity is used, it is possible to prevent the recording medium from floating, loosening, and transport distortion, thereby preventing defective transport and defective recording.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional explanatory view of a recording apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a recording unit.

FIG. 3 is a block diagram of a control system.

FIG. 4 is a flowchart illustrating a recording operation procedure.

FIG. 5 is a diagram illustrating a state of a discharge upper roller during recording.

FIG. 6 is an explanatory diagram when a roll sheet is used as a recording medium.

FIG. 7 is an explanatory diagram of a recording operation of the apparatus according to the second embodiment.

FIG. 8 is a flowchart of a recording procedure according to the second embodiment.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cassette 2 ... Recording medium 3 ... Pickup roller 4 ... Conveying means 4a ... Conveying lower roller 4b ... Conveying upper roller 4c ... Discharge lower roller 4d ... Conveying upper roller 4e ... Conveying motor 4f, 4g ... Shaft 4h, 4i ... Arm 4j .., 4k... Tension spring 5... Platen 6... Recording means 6a... Carriage 6b... Pressing motor 8b Eccentric cam 9 Control unit 9a CPU 9b ROM 9c RAM 10 External device 11 Interface 12 Operation unit 13 Motor driver 14 Head driver 15 Pressure switching means 15a Shaft 15b Arm 15c: Spring 15d Leaf spring 15e: Eccentric cam 15f: Pressure motor 16: Discharge motor 17… Torque limiter

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatoshi Katai 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Setsu Uchida 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Non-corporation (72) Inventor Atsushi Munakata 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-2-293154 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) B41J 13/02 B41J 2/01

Claims (6)

(57) [Claims] A recording unit configured to perform recording on a recording medium; a first conveying member that is disposed upstream of a recording position of the recording unit in a conveying direction of the recording medium and conveys the recording medium; A second conveying member that is disposed downstream of the recording position in the conveying direction of the recording medium and conveys the recording medium, and a pressure switching unit that switches a contact pressure of the second conveying unit with the recording medium. When the recording medium is conveyed by the second conveying member and when the conveyance is stopped.
And the contact pressure of the second transport member against the recording medium
A recording apparatus characterized by switching . 2. The method according to claim 1, wherein the first conveying member and the second conveying member are
The roller of the second conveying member on the side that comes into contact with the recording surface of the recording medium when the conveyance of the recording medium is stopped has a weaker contact force with the recording medium than during conveyance, The recording apparatus according to claim 1, wherein the recording apparatus is configured to be separated from the medium. 3. The recording apparatus according to claim 2, wherein the roller of the second conveying member on the side contacting the recording surface of the recording medium is a driven roller. 4. The recording apparatus according to claim 1, wherein said recording means is of an ink jet recording type which performs recording by discharging ink according to a signal. 5. The ink-jet recording system according to claim 4, wherein the recording means supplies electricity to the electrothermal transducer in accordance with a signal, and performs recording by discharging ink using thermal energy from the electrothermal transducer. The recording device according to any one of the preceding claims. 6. The recording means supplies a current to the electrothermal transducer in response to a signal, and ejects ink from an ejection port to perform recording by growing bubbles generated by heating by the electrothermal transducer. The recording apparatus according to claim 5, wherein the recording apparatus is an inkjet recording method that performs the following.