JP2005343636A - Transport device and recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely suck a recording medium to a transport belt 31 even if the moisture content of the recording medium P increases in both-sided recording. <P>SOLUTION: This transport device 3 includes: the transport belt 31 having a sucking force generating means 36 for sucking and transporting a recording medium P by applying voltage to an electrode; and a both-sided transport part 6 for turning over the recording medium P transported with a first surface as the obverse by the transport belt 31 and again supplying the same to the transport belt 31 to be transported with a second surface as the obverse. The transport device 3 varies the applied voltage to the transport belt 31 so that the potential difference between the transport belt 31 and the recording medium P in the case of transporting the recording medium with the second surface taken as the obverse is larger than the potential difference between the transport belt 31 and the recording medium P in the case of transporting the recording medium with the first surface taken as the obverse. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a conveying apparatus that sucks and conveys a recording medium onto a conveying belt, and a recording apparatus that performs recording on a recording medium conveyed by the conveying apparatus.

  In general, an ink jet recording apparatus performs recording by ejecting ink from a recording head to a recording medium conveyed by a conveying unit or the like. Inkjet recording devices can easily make the recording head compact, can record high-definition images at high speed, have low running costs, are non-impact, have low noise, and use multicolor ink. It has an advantage that it is easy to use and record a color image. In particular, a full line type apparatus using a line type recording head in which a large number of ejection openings are arranged in the width direction of the recording medium can further increase the recording speed.

  However, in a full-line apparatus, an apparatus having a large number of line-type recording heads in the recording medium conveyance direction increases the distance from the recording head at the most upstream position to the recording head at the most downstream position. For this reason, when the water content of the recording medium increases in the recording area, the recording medium is lifted, and the ink ejected from the recording head does not land at a desired position on the recording medium, which may affect the recording quality. It is done. In order to prevent this influence, it is necessary to urge the recording medium to the conveying means so that the recording medium does not float up.

  As a means for urging the recording medium to the conveying means, a method is generally known in which an electrode is provided on the conveying means, an electric charge is applied to the electrode to generate an electrostatic force, and the recording medium is attracted to the conveying means ( For example, see Patent Document 1).

JP 2002-284383 A

  Recently, there has been an increasing demand for recording not only on one side of a recording medium but also on both sides of the recording medium. When recording on both sides of the recording medium, first, ink is ejected by the recording head on the first surface, and then ink is ejected by the recording head on the second surface. In this case, when recording is performed on the first surface of the recording medium, the water content of the recording medium increases, so that the recording medium swells more than recording on one side and a wave (so-called cockling) may occur. May affect the recording quality. Here, even if the above-mentioned prior art is transported on both sides, it is possible to sufficiently satisfy the recording quality desired at that time, but in recent years higher recording quality has been demanded.

  In addition, when using a conveyor belt as a conveyor member, if the belt is left for a long period of time while attached to the apparatus main body, wrinkles may occur in a portion having a strong curvature that abuts the conveyor roller or the like.

  Therefore, an object of the present invention is to reliably adsorb the recording medium to the conveying member even when the moisture content of the recording medium increases when performing double-sided recording.

  In order to achieve the above object, a typical configuration according to the present invention includes a conveying member having an attracting force generating means for attracting and conveying a recording medium by applying a voltage to an electrode, and the first surface is surfaced by the conveying member. A double-sided conveyance unit that turns over the recording medium conveyed and supplies the recording medium to the conveyance member again and conveys the second surface as a front surface. The potential difference between the transport member and the recording medium when transporting the recording medium with the second surface as the surface is greater than the potential difference between the transport member and the recording medium when transporting the recording medium with the surface facing the surface. The voltage applied to the conveying member is changed so as to increase.

  In the present invention, compared to the case where the first surface is conveyed, the case where the second surface is conveyed and the conveyance member is arranged so that the potential difference between the conveying member and the recording medium becomes larger. In order to change the applied voltage, even if the moisture content of the recording medium increases after recording on the first side, the potential difference between the conveying member and the recording medium increases when recording on the second side. Thus, since the adsorption force of the recording medium to the conveyance member increases, the recording medium can be reliably adsorbed to the conveyance member.

  Since the present invention has the above-described configuration and operation, even when double-sided recording is performed, the recording medium can be reliably adsorbed to the conveyance belt even if the water content of the recording medium is increased.

  Hereinafter, with reference to the drawings, an embodiment of a recording medium transport apparatus to which the present invention is applied will be described in detail. In the following embodiments, a recording medium transport device used in an ink jet recording apparatus that performs recording by discharging ink is illustrated.

  A recording apparatus provided with a recording medium conveying apparatus according to the present embodiment will be specifically described with reference to the drawings.

  First, the overall configuration of the recording apparatus will be described with reference to the drawings. A recording apparatus having an automatic feeding device includes a feeding unit, a conveying belt unit (conveying means, a conveying device), a double-sided conveying unit attached to the conveying belt unit, a discharge unit, and a recording head unit. FIG. 1 is a cross-sectional view showing the overall configuration of the recording apparatus 1. The feeding unit 2, the conveyor belt unit 3, the duplex conveying unit 6, the recording unit 7, and the discharging unit 4 will be described with reference to FIG.

  The feeding unit 2 is configured such that a pressure plate 21 on which a recording medium P as a recording medium is stacked and a feeding rotating body 22 that feeds the recording medium P are attached to the base 20. The pressure plate 21 is rotatable about a rotation axis a coupled to the base 20 and is urged by the pressure plate spring 24 to the feeding rotating body 22. A separation pad 25 made of a material having a large coefficient of friction such as an artificial skin for preventing the double feeding of the recording medium P is provided at a portion of the pressure plate 21 facing the feeding rotating body 22. Further, the base 20 covers a corner portion of the recording medium P in one direction, and the separation claw 26 for separating the recording medium P one by one, the pressure plate 21 and the feeding rotating body 22 are released from contact with each other. A release cam is provided.

  In the above configuration, the release cam pushes the pressure plate 21 down to a predetermined position in the standby state. As a result, the contact between the pressure plate 21 and the feeding rotating body 22 is released. In this state, when the driving force of the conveying roller 32 is transmitted to the feed rotating body 22 and the release cam by a gear or the like, the release cam moves away from the pressure plate 21, and the pressure plate 21 rises, and the feed rotating body 22 and the recording medium P come into contact with each other, and the recording medium P is picked up as the feeding rotating body 22 rotates, and feeding is started. The recording media P are separated one by one by the separation claw 26 and are sequentially fed to the conveyance belt unit 3 described later. When the feeding rotator 22 rotates until the recording medium P is fed to the conveyance belt unit 3 and then enters a standby state where the contact between the recording medium P and the feeding rotator 22 is released again, the feeding roller 32 is driven from the conveyance roller 32. Power is cut off.

  Reference numeral 90 denotes a feeding rotating body for manual feeding. The feeding rotator 90 rotates in accordance with a computer recording command signal and conveys the recording medium P installed on the manual feed tray 91 in the direction of the conveying roller 32.

  The conveyor belt unit 3 is configured to attract and convey the recording medium P to a conveyor belt (conveying member) 31. The transport belt unit 3 includes a transport belt 31 that transports the recording medium P and a PE sensor (not shown).

  The conveyance belt 31 has an adsorption force generating means 36 for adsorbing the recording medium to the conveyance belt 31.

  The conveyor belt 31 is driven by a driving roller 34 and is wound around a conveyor roller 32 and a pressure roller 35 which are driven rollers. The conveying roller 32 and the driving roller 34 are rotatably attached to the platen 30, and the pressure roller 35 is rotatably attached to the other end of the arm 50 that is swingably attached to the platen 30. Tension (2.0 kgf) is applied to the conveyor belt 31 by the arm 50 being pressed by the spring 51. The platen 30 is located below the conveyor belt 31 and serves to regulate the downward displacement of the conveyor belt 31.

  A conveying belt 31 and a driven pinch roller 33 are provided in contact with each other at a position facing the conveying roller 32. The pinch roller 33 is brought into pressure contact with the transport belt 31 by a spring (not shown) to guide the recording medium P to the recording head unit. Further, electric charges accumulated in the surface layer of the conveyor belt 31 are removed by conducting with a main body frame (not shown).

  Further, an upper guide 27 and a lower guide 28 for guiding the recording medium P are disposed at the entrance of the conveying belt unit 3 to which the recording medium P is conveyed. In addition, the upper guide 27 is provided with a PE sensor lever 23 that transmits detection of the leading and trailing ends of the recording medium P to a PE sensor (not shown). Further, on the downstream side of the conveyance roller 32 in the recording medium conveyance direction, a recording unit 7 that forms an image based on image information is provided.

  In the above configuration, the recording medium P sent to the transport belt unit 3 is guided by the upper guide 27 and the lower guide 28 and sent to the roller pair of the transport roller 32 and the pinch roller 33. At this time, the leading end of the conveyed recording medium P is detected by the PE sensor lever 23 to obtain the recording position of the recording medium P. Further, the recording medium P is conveyed by the rotation of the conveying belt 31 via the conveying roller 32 by the motor.

  The transport belt 31 that moves while adsorbing and holding the recording medium P is made of synthetic resin such as polyethylene or polycarbonate having a thickness of about 0.1 mm to 0.2 mm, and has an endless belt shape. .

  The conveyor belt 31 is composed of a first electrode group having a plurality of electrode plates 36a and a second electrode group having a plurality of ground plates 36b. The layers 36d are joined together by means such as adhesive or heat welding.

  Here, the adsorption force generating means 36 will be described. As shown in FIG. 2, the attracting force generating means 36 is configured by alternately arranging electrodes (electrode plate 36a, ground plate 36b) having the same polarity, different polarity made of conductive metal or different potentials, one of which is grounded. As shown in the drawing, each tooth has a comb-like shape independently, and a plurality of teeth are installed on the conveyance belt 31 so as to face each other in a direction orthogonal to the belt conveyance direction. Terminals 36a ′ and 36b ′, which are power-feeding portions exposing the pattern, are provided at both ends in the moving direction of the conveyor belt 31 so as to have a distance longer than the width of the electrodes 36a and 36b in the belt moving direction. In addition, conductive power supply brushes 52 that are in contact with each other at a predetermined pressure are provided, and a positive or negative voltage is applied to the terminal 36a ′ of the electrode plate 36a by a high voltage power supply (charging means or power supply means) (not shown). The terminal 36b 'of the ground plate 36b is grounded. By applying a voltage of about 0.5 kV to 10 kV to the power supply brush 52, an attracting force is generated on the conveying belt 31 at a recording position below each recording head 7. The power supply brush 52 is connected to a high voltage power source (not shown) that generates a predetermined high voltage.

  When a voltage is applied to the electrode plate 36a, an electric force is generated in the direction from 36a to the ground plate 36b, and electric lines of force are formed. Then, an attractive force is generated above the transport belt 31 due to the potential difference between the electrode plate 36a and the ground plate 36b, and the same polarity as the voltage applied to the electrode plate 36a is formed on the recording surface of the recording medium P. Charge (surface potential) is generated. Incidentally, the adsorption force of the recording medium P is the lowest region where there is no conductive metal between the electrode plate 36a and the ground plate 36b.

  38 is a pair of cleaning rollers, and is sandwiched between the belt 31. The cleaning roller 38 can absorb ink to remove stains such as ink adhering to the belt 31, and has a pore diameter to prevent deterioration in durability. And is formed of a sponge of a reticulum (preferably 10 μm to 30 μm). The transport belt 31 is cleaned by the cleaning roller pair 38 and then neutralized by a neutralizing brush 37 serving as a neutralizing unit.

  The double-sided conveyance unit 6 reverses the recording medium P conveyed by the conveyance belt 31 with the first surface facing the front surface, and supplies the recording medium P to the conveyance belt 31 again with the second surface, which is the back surface of the first surface. It is. Specifically, the double-sided conveyance unit 6 turns over the recording medium P as follows. First, the recording medium P on which recording on one side (first side) is completed is conveyed to the discharge side. When the rear end of the recording medium P reaches the nip portion of the discharge roller 41 and the spur 42, the discharge roller 41 is reversed. The recording medium P is reversely conveyed. The recording medium P is introduced into a double-sided conveyance path disposed in the lower part of the conveyance belt unit 3 in FIG. 1 and conveyed by a plurality of feed rollers in the double-sided conveyance path, and then again with the conveyance roller 32 and the pinch roller 33. The recording medium P is supplied onto the conveyance belt through the gap. As a result, the surface (first surface) opposite to the surface on which the recording was first performed on the recording medium P (second surface) can be set as the front surface and directed toward the recording unit 7, and recording on both sides is possible. Become.

  The recording unit 7 as a recording unit uses a line type ink jet recording head in which a plurality of nozzles are arranged in a direction orthogonal to the conveyance direction of the recording medium P, and is 7K (black) from the upstream side in the conveyance direction of the recording medium P. , 7C (cyan), 7M (magenta), and 7Y (yellow) are arranged at predetermined intervals in this order, and the recording heads 7K, 7C, 7M, and 7Y are attached to the head holder 7a. This recording head can apply heat to the ink by a heater or the like. The heat causes the ink to boil, and the ink is ejected from the nozzles of the recording head by a pressure change caused by the growth or contraction of the bubbles due to the film boiling, so that an image is formed on the recording medium P.

  One end of the recording unit 7 is pivotally fixed by a shaft 71, and a projection 7B formed on the other end engages with a rail 72 to define a distance (between paper) between the nozzle surface and the recording medium P. It has come to be.

  The discharge unit 4 includes a discharge roller 41 and a spur 42. The recording medium P recorded by the recording unit 7 is sandwiched and conveyed between the discharge roller 41 and the spur 42 and is discharged to the discharge tray 43. The discharge roller 41 is driven by the rotational force of the drive roller 34 by a transmission means (not shown). The spur 42 rolls on the recording surface after recording, so that the contact area with the recording medium is small, and even if it contacts the recording surface after recording, the recorded image on the recording medium is not disturbed. It is the comprised rotary body.

  Next, the configuration of the transport belt unit according to the present embodiment will be described in more detail with reference to FIGS. 3 and 4. FIG. 3 is a perspective view showing a configuration of the entire conveyance belt unit, and FIG. 4 is an explanatory diagram of a platen.

  First, the platen 30 will be described. As shown in FIGS. 3 and 4, the platen 30 has convex portions 30a at positions facing the recording heads 7K, 7C, 7M, and 7Y, and a nozzle surface (direction perpendicular to the transport direction) in the nozzle row direction (direction perpendicular to the transport direction). It is arranged in parallel with the (face surface).

  The surface 30b of the convex portion 30a facing the conveyance belt 31 is a plane using a predetermined width (in the belt conveyance direction), and the surfaces 30b of the convex portions 30a facing the nozzle surface of each recording head are the same plane. Located on the top. In order to obtain a sufficient suction force, the convex portion 30a is made of a conductive material, and a low friction layer 30c (such as a Teflon (registered trademark) film or a high molecular weight polyethylene film) is provided on a surface 30b that slides on the conveyor belt 31. (Thickness: 100 μm, friction coefficient 0.2) is configured on the entire surface, and during transportation, the friction with the conveyor belt 31 is reduced and the rotational load during rotation is stabilized to ensure the conveyance accuracy. Yes.

  A description will be given of the principle of suppressing the suction force residual wrinkle shape of the transport belt and the fluttering of the transport belt due to transport in the actual operation situation.

  First, the residual ridge shape will be described. As described above, the conveyor belt 31 is composed of the adsorption force generating means 36 (electrode plate 36a, ground plate 36b), the base layer 36c, and the surface layer 36d, and the layers are means such as an adhesive or heat welding. However, due to the difference in curvature inherent to the material, the curvature of contact with the conveying roller 32, the driving roller 34, and the pressure roller 35 when the conveying belt unit 3 is left attached to the recording apparatus 1 for a long period of time. Wrinkles occur in the strong parts (creep). When the conveyance operation is started in this state, the conveyance belt 31 is pulled in the conveyance direction by the tension applied by the pressure roller 35 at a position facing the recording head unit suspended by the conveyance roller 32 and the driving roller 34. In the part with the mark, the shape of the ridge remains, and a wave of about 0.5 mm to 1.0 mm is generated.

  In this embodiment, an electric force is generated by applying a high voltage (0.5 kV to 10 kV) to the electrode plate 36a of the conveyance belt provided with the comb-teeth electrodes, and the recording medium P is adsorbed on the upper surface to record the recording medium P. In the same manner, the convex portion 30a of the platen 30 is attracted by the lower surface to suppress the wobbling of the conveying belt 31 to realize stable recording on the recording medium and conveyance of the conveying belt 31. .

  The attraction force with respect to the convex portion 30a of the conveyor belt 31 can be regarded as a capacitor connected in series by modeling (see FIGS. 5B and 5C), and therefore the relational expression of FIG. Is true. As described above, the suction force between the conveyor belt 31 and the platen 30 increases as the applied voltage to the electrode plate 36a of the conveyor belt 31 increases (the potential difference between the first electrode group and the second electrode group increases). The greater the distance, the stronger. The greater the distance between the conveyor belt 31 and the platen 30, the weaker the distance.

  On the other hand, when the recording medium P for recording on both sides is attracted to the conveyance belt 31, the first side of the recording medium P is recorded, and the recording is performed by the duplex conveying unit 6 after the recording on the first side is finished. Thus, the inventor has found that it is necessary to change the applied voltage when recording the second surface. This is because when recording is performed on the second surface, ink droplets have been driven into the recording medium P, and the water content of the recording medium P has changed. In addition, when the environment changes depending on conditions, the amount of water in the recording medium P increases particularly when the humidity is high, and it may be difficult to adsorb even on one side.

  Therefore, the present inventor arranges a humidity detection sensor (humidity detection means) in the vicinity of the conveyor belt in the apparatus machine, although not shown, determines the applied voltage on one side and further changes the applied voltage on both sides to ensure the conveyance. Attempts were made to adsorb the recording medium on both sides of the belt. 6 and 7 are relationship diagrams of adsorption force-water content-applied voltage. The vertical axis represents the adsorption force and cockling suppression voltage, and the horizontal axis represents the water content of the recording medium.

  As shown in FIG. 6, the applied voltage to the electrode plate is ± 0.5 kV, ± 1.0 kV, ± 1.5 kV (+0.5 kV or −0.5 kV, +1.0 kV or −1.0 kV, +1.5 kV Or, the adsorption power at −1.5 kV (the same applies hereinafter) decreases as the water content of the recording medium increases. In addition, when the applied voltage increases, it is defined that the ejection droplet is displaced due to the influence of the electric field when the ink is ejected from the recording head, and the misalignment is within the ± 1.5 kV curve. A range curve was formed. Here, if the voltage is less than the allowable tolerance range, the recording quality is not affected, but the voltage is preferably less than the acceptable safety range.

  The cockling suppression applied voltage is a voltage that is applied to suppress a phenomenon that undulates when the ink is driven into the recording medium due to moisture in the ink. As can be seen from FIG. 6, in order to attract the recording medium to the conveying belt in a normal room temperature environment, the applied voltage may be set to about ± 0.6 kV, but in the case of low temperature and low humidity, it is about ± 0.4 kV. In the case of high temperature and high humidity, an applied voltage of about ± 1.0 kV is required. This is because the moisture content (moisture content) in the recording medium varies depending on the environment. In particular, the moisture content is high in a high-temperature and high-humidity environment, making it difficult to adsorb. For this reason, as the water content increases, it becomes necessary to increase the voltage applied to the conveyor belt 31.

  Next, the difference between the voltage applied to the conveyor belt and the attracting force during double-sided conveyance and during single-sided conveyance will be described.

  As shown in FIG. 7, when standard image recording is performed during single-sided conveyance, the applied voltage to the conveyance belt is about ± 1.0 kV in order to attract the recording medium to the conveyance belt. In this environment, when recording is performed by carrying the double-sided conveyance through the double-sided conveyance unit 6, since the ink has already been applied to the recording medium, the water content of the recording medium is increased (in the case of “both sides” in FIG. 7). See line).

  In such a case, it is necessary to apply a larger voltage (having an absolute value) to the conveyance belt in order to reliably attract the recording medium to the conveyance belt. Here, in the environment described above, the voltage applied to the recording medium during the double-sided conveyance is ± 1.5 kV. That is, it is necessary to further apply a voltage of at least ± 0.5 kV at the time of double-sided conveyance compared to at the time of single-sided conveyance.

  Further, when the ink ejection amount from the recording head to the recording medium is maximized, the water content of the recording medium is further increased. For this reason, it is necessary to further increase the voltage applied to the conveyor belt in order to stably transport the recording medium when performing recording during duplex conveyance. In this embodiment, when the maximum amount of ink is ejected from the recording head onto the recording medium during single-sided conveyance, the voltage applied to the conveyance belt becomes ± 2.0 kV. That is, at the time of double-sided conveyance, it is necessary to further apply a voltage of at least ± 1.0 kV as compared with that at the time of single-sided conveyance.

  For this reason, in this embodiment, the recording medium is stably adsorbed to the conveyance belt by increasing the voltage applied to the conveyance belt during double-sided conveyance rather than during single-sided conveyance. That is, the potential difference between the transport belt and the recording medium when transporting the recording medium with the second surface as the surface is larger than the potential difference between the transport belt and the recording medium when transporting the recording medium with the first surface as the surface. The applied voltage to the conveyor belt is changed so that the direction becomes larger.

  Specifically, first, a humidity detection sensor (not shown) detects humidity. Next, the control means acquires a detection signal obtained by converting the humidity detected by the humidity detection sensor, and determines the moisture content of the recording medium based on the detection signal. And a control means determines the applied voltage amount which increases with respect to a conveyance belt, for example using the graph of FIG. 7, etc. according to the change of the said water content, and further applies this increased applied voltage amount.

  That is, the potential difference between the first electrode group and the second electrode group when transporting the recording medium with the first surface as the surface is greater than the first difference when the recording medium is transported with the second surface as the surface. The absolute value of the voltage applied to the electrode plate 36a is increased so that the potential difference between the one electrode group and the second electrode group is increased.

  With this configuration, the recording apparatus of the present embodiment applies a desired applied voltage to each transport surface when transporting a recording medium having a high water content and causing cockling. Can be reliably adsorbed to the conveyor belt. According to the present embodiment, since the recording medium is reliably adsorbed to the conveyance belt, the distance between the recording head and the recording medium can be kept constant, and the recording quality can be maintained even in the double-sided conveyance.

  Here, the control means determines the applied voltage based on the detected humidity. However, the present invention is not limited to this, and the control means calculates the ink ejection amount from the recording head to thereby determine the water content of the recording medium. It is good also as determining an applied voltage based on this by grasping | ascertaining a change, It is good also as determining the applied voltage based on this, acquiring both data of detected humidity and the amount of ink placement.

[Other Examples]
In the above-described embodiment, when changing the applied voltage during single-sided conveyance and double-sided conveyance, the control means detects the moisture content of the recording medium and the ink ejection amount signal to the recording medium, and changes the applied voltage. However, it is not limited to this. For example, the amount of the additional voltage (for example, ± 0.5 kV) is uniformly increased when the recording medium is transported on the opposite surface (second surface) than when the recording medium is transported on one surface (first surface). The applied voltage may be controlled so as to be applied.

  In the above-described embodiments, the endless transport belt is exemplified as the transport member. However, the present invention is not limited to this. For example, a drum shape may be used.

  In the above-described embodiments, the case of an inkjet double-side recording apparatus for color recording using a plurality of recording heads that record with different color inks has been described as an example. However, the present invention is not limited to this. Rather, for example, an inkjet recording apparatus that uses one recording head, or an inkjet recording apparatus for gradation recording that uses a plurality of recording heads that record with the same color and different densities, also relates to the number of recording heads. The present invention can be applied in a similar manner, and the same effects can be achieved.

  Further, as the recording means (recording head), the recording type and the recording head and the ink tank are integrated, or the recording head and the ink tank are separated and connected by an ink supply tube. Any configuration of the ink tank can be applied in the same manner, and the same effect can be achieved.

  In addition, when the present invention is applied to an ink jet recording apparatus, it can be applied to, for example, a recording unit that uses an electromechanical transducer such as a piezo element. In particular, ink is ejected using thermal energy. In the ink jet recording apparatus using the recording means of the above system, an excellent effect is brought about. This is because such a system can achieve higher recording density and higher definition.

  Furthermore, the present invention can be effectively applied to a so-called serial type recording apparatus that performs recording while moving the recording head in a direction orthogonal to the conveyance direction of the recording medium. Alternatively, even in the case of a full-line type recording apparatus having a length corresponding to the maximum width of a recording medium that can be recorded by the recording head, such a recording head has a length that is determined by a combination of a plurality of recording heads. Either a satisfying configuration or a single recording head formed integrally may be used. In addition, even with the serial type described above, the recording head fixed to the main body of the apparatus, or the replacement that enables the electrical connection with the main body of the apparatus and the supply of ink from the main body of the apparatus when mounted on the main body. The present invention is also effective when a free chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself is used.

  In addition, as an embodiment of the above-described ink jet recording apparatus, an ink jet input / output apparatus that can be used as an image output terminal device of an information processing device such as a computer, or a scanner other than a recording head can be mounted on a carriage. Further, it may be a copying machine combined with a reader or the like, or a facsimile machine having a transmission / reception function.

  As an application example of the present invention, the present invention can be used as an inkjet recording apparatus having a conveying apparatus that conveys a recording medium on both sides, and a conveying apparatus used in the recording apparatus.

1 is an overall explanatory diagram of a recording apparatus. The figure which looked at the conveyance belt from the upper surface. The perspective view of a conveyance belt. Sectional drawing of a conveyance belt. The figure which shows the attraction | suction force with respect to the platen of a conveyance belt. The figure which shows the adsorption | suction force to the conveyance belt of the recording medium by an environmental change. FIG. 4 is a diagram illustrating an adsorption force of a recording medium to a conveyance belt due to a difference in conveyance surface.

Explanation of symbols

P: Recording medium (recording medium)
1. Recording device (recording device)
3 ... Conveying belt (conveying means, conveying device)
6 ... Double-sided conveyance unit
7: Recording section (recording means)
31 ... Conveying belt (conveying member)
36… Adsorption force generation means (Adsorption force generation means)
36a ... Electrode plate (electrode)
36b ... Earth plate (electrode)

Claims (9)

A conveying member having an attracting force generating means for attracting and conveying the recording medium by applying a voltage to the electrodes, and the recording medium conveyed with the first surface by the conveying member are turned over, and the recording medium is again In a conveying apparatus having a double-sided conveying unit that supplies the conveying member and conveys the second surface as a surface,
The transporting device and the recording when the recording medium is transported with the second surface as the surface, rather than the potential difference between the transporting member and the recording medium when the recording medium is transported with the first surface as the surface. A transport apparatus characterized in that a voltage applied to the transport member is changed so that a potential difference with a medium becomes larger. In the conveyance apparatus of Claim 1,
A conveying apparatus characterized in that the applied voltage is changed based on a humidity change detected by a humidity detecting means arranged in the vicinity of the apparatus. In the conveyance apparatus of Claim 1 or 2,
The conveying apparatus, wherein the conveying member is an endless belt member without a joint. In the conveyance apparatus in any one of Claims 1 thru | or 3,
The attraction force generating means is constituted by alternately arranging comb-like electrodes of different polarities. In a recording apparatus comprising: a conveying unit that conveys a recording medium; and a recording unit that is disposed to face the conveying unit.
The recording apparatus according to claim 1, wherein the transport unit is the transport apparatus according to claim 1. The recording apparatus according to claim 5, wherein
The recording apparatus, wherein the recording means is an ink jet recording head that ejects ink onto a recording medium. In a recording apparatus for recording on a recording medium using a recording means for discharging ink,
A transport belt for transporting a recording medium at a position where recording is performed by the recording means;
A first electrode group having a plurality of electrodes arranged in the transport direction inside the transport belt;
A second electrode group having a plurality of electrodes arranged between the electrodes of the first electrode group inside the conveyor belt;
In order to attract and convey the recording medium to the conveyance belt by electrostatic force generated by providing a potential difference between the first electrode group and the second electrode group, the electrode groups are set to have a predetermined potential. Charging means for charging each electrode group;
In order to perform recording on the second surface of the recording medium on which recording has been performed on the first surface, the recording medium conveyed by the conveying means with the first surface as the front surface is reversed so that the second surface is the front surface. A double-sided conveyance unit to be sent to the conveyance means,
The charging is performed so that the potential difference between the first electrode group and the second electrode group differs between when the recording medium is conveyed with the first surface as a front surface and when the recording medium is conveyed with the second surface as a surface. And a control means for controlling the means. The recording apparatus according to claim 7, wherein
When the control means transports the recording medium with the second surface as the surface, rather than the potential difference between the first electrode group and the second electrode group when the recording medium is transported with the first surface as the surface. The recording apparatus is controlled to increase the potential difference between the first electrode group and the second electrode group. The recording apparatus according to claim 7 or 8,
The recording apparatus according to claim 7, wherein the recording unit is an ink jet recording head that discharges ink onto a recording medium.

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