JP2008222421A - Recording medium carrying device of recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discriminate whether or not a recording medium can be carried electrostatic adsorption by measuring an electric current value outputted from a (±) pole power source supplied to an electrode of a carrier belt. <P>SOLUTION: This recording medium carrying device is provided for attracting the recording medium by an electrostatic force generated from the electrode of the carrier belt by applying voltages on a (+) pole electrode from a (+) pole high voltage power source and to a (-) pole side electrode from a (-) pole high voltage power source via a power supply member by arranging an electrode for applying the voltage on the (+) pole side and an electrode for applying the voltage on the (-) pole side in the carrier belt. The recording medium carrying device is characterized by stopping the carrying of the recording medium by determining as an electrostatically unattractable paper kind when an electric current value detected in an electric current detecting part does not increase when carrying the recording medium by arranging a (+) pole electric current detecting part for measuring the electric current value outputted from the (+) pole high voltage power source and a (-) pole electric current detecting part for measuring the electric current value outputted from the (-) pole high voltage power source. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a recording medium conveying method of an ink jet recording apparatus, and more particularly to a recording medium conveying apparatus of an ink jet recording apparatus having a plurality of full line type ink jet recording heads having a recording element array corresponding to the width of the recording medium. is there.

  For example, as an information output device in a word processor, personal computer, facsimile, or the like, there is a printer that records information such as desired characters and images on a sheet-like recording medium such as paper or film.

  Various methods are known as printer recording methods, but non-impact recording is possible because of non-contact recording on recording media such as paper, low running costs, easy colorization, and quietness. In recent years, the inkjet method has attracted particular attention because of its richness.

  In addition, among inkjet recording apparatuses, a full-line type recording apparatus that has a recording head having a recording element (nozzle) array corresponding to the recording width and performs recording while conveying a recording medium is more rapid in recording. It is being widely used because it is possible to make it.

  Such a full-line type recording apparatus arranges a plurality of recording heads that discharge inks of different colors in the recording medium conveyance direction so that ink can be discharged simultaneously from each recording head. The recording speed is not lowered during recording.

  A recording head of such an ink jet recording apparatus includes an energy generator that generates energy to be applied to ink in order to discharge ink as droplets from the discharge port, and the energy generator that is included in the discharge port. The ink flow path is generally composed of an ink flow path, and ink storage means such as an ink tank for storing ink supplied to the energy generator through the ink flow path.

  Recording devices having functions such as printers, copiers, facsimiles, etc., or recording devices used as output devices such as composite electronic devices and workstations including computers (hereinafter abbreviated as PCs) and word processors are based on recorded information. An image (including characters and symbols) is recorded on a recording material such as paper or a plastic thin plate. In recent years, a laser beam printer (hereinafter abbreviated as LBP), an ink jet printer (hereinafter abbreviated as IJP), a thermal printer, and the like have been put to practical use as the recording apparatus in place of the conventional dot matrix printer. To date, LBP capable of high-resolution and high-quality gradation expression and IJP capable of full-color expression of photographic image quality have been put into practical use. Accompanying this improvement in the performance of the recording apparatus main body, high-quality recording media such as glossy paper, glossy film, and code paper as well as a medium dedicated to photographic image quality have been put into practical use in order to bring out the printing performance of the recording apparatus sufficiently. ing. For this reason, the recording apparatus main body is required to have performance capable of recording on various diversified recording papers, and accordingly, the recording speed is also required to be as high as LBP.

  Therefore, in the high-speed IJP, a full-line type ink jet head is mounted, and the recording medium is conveyed under the ink jet head without moving the ink jet head in a direction perpendicular to the recording medium conveying direction as in the conventional type IJP. It is configured so that printing can be performed only by itself. As a result, the recording medium can be continuously conveyed without being intermittently conveyed as in the case of the conventional IJP, so that the printing speed can be increased. In addition, since the number of nozzles for ejecting ink has increased remarkably, the recording area per unit time also increases, so that a sufficient printing speed can be obtained even if the recording medium is conveyed at high speed.

  In this recording apparatus, a conductive electrode is provided on an endless belt member that conveys a recording medium, an electrostatic force is generated by applying an electric charge, and recording is performed while adsorbing the recording medium to the belt member and conveying the recording medium Is generally known. Hereinafter, a description will be given with reference to FIGS.

  As shown in FIG. 4, the conveying belt 31 as the endless belt member is integrally provided with an adsorbing force generating means composed of electrode plates 36a and 36b made of conductive metal, a base layer 36c, a surface layer 36d, and the like. It has been.

  FIG. 5 is a view of the endless belt as viewed from above. The electrode plates 36a and 36b are included in the belt, and the electrode is exposed only at a part of both ends surrounded by a broken line, and the power feeding member contacts in the halftone dot area so that a voltage can be applied to the electrode. Has been.

  Further, as shown in FIG. 6, the power supply means for supplying power to the transport belt includes a power supply brush 51, a power supply electrode 52, and a support member 53. A power supply brush 51 for supplying a charge is in contact with the power-supplied member 36e. Electric charges are supplied from the power supply brush 51 to the power-supplied member 36e, and an electrostatic force is generated. Thereby, it is possible to always generate a good adsorption force.

  Moreover, although not shown in figure, the static elimination brush which performs static elimination in contact with the to-be-powered member of the said conveyance belt is provided in the conveyance direction downstream rather than the said electricity supply brush. By discharging the conveying belt with this discharging brush and eliminating the suction force, smooth discharge can be performed.

  7 is a view of the endless belt as viewed from above, and FIG. 8 is a view of the broken line portion of FIG. 7 as viewed from the cross section. A platen 320 for positioning the endless belt 102 is provided below the endless belt 102. The surface of the platen 320 is flat, and the endless belt 102 is configured to position the distance from the head unit 200 and keep it parallel. The distance between the surface of the endless belt 102 and the head unit 200 is usually about 1.5 mm, and is reduced to a distance of about 0.5 to 0.7 mm when printing with higher definition. The platen 320 is made of a conductive material, and the endless belt 102 is attracted to the platen 320 by electrostatic force generated from electrodes provided on the endless belt 102. At the time of conveyance, the endless belt 102 slides on the platen 320, and the endless belt 102 is driven so as to always keep flatness without fluttering.

For example, Patent Literature 1 can be cited as a conventional example.
Japanese Patent Laid-Open No. 11-151843

  However, there are two types of methods for adsorbing and conveying the recording medium on the conveying belt by electrostatic force, which can be adsorbed depending on the paper type.

  This difference is largely due to the material of the recording medium itself, and is not only a conventional paper generally composed of a uniform material called plain paper, but recently, such as coated paper, glossy paper, art paper, etc. Many papers called so-called high-functional papers have appeared, such as papers that are coated or specially processed on one or both sides based on a simple pulp material, or papers that are mixed with materials other than pulp. Whether or not it can be adsorbed by electrostatic force is largely due to the resistance value of the paper itself, so a method to measure and discriminate the resistance value of the paper in advance can be considered, but it varies depending on the processing state of the surface rather than the resistance value of the paper itself Since surface resistance is important, surface resistance must be measured accurately. However, it is difficult to measure a resistance value of about 10E10 in a short time, and providing a new device for measuring the resistance value is disadvantageous from the viewpoint of space and cost.

  In addition, it is conceivable to measure the resistance value of the paper in advance, instead of measuring it in the device, and make a determination based on that information. However, the resistance value of the paper is easily affected by humidity and the environmental humidity or the absolute humidity. Since it changes, it is fully predicted that the resistance value measured in advance is different from the resistance value at the time of actual conveyance.

  As described above, in the system in which the recording medium is attracted to the transport belt by the electrostatic force and transported, it is difficult to reliably determine whether the recording medium can be attracted in advance.

  According to a first aspect of the present application, an electrode for applying a voltage to the positive pole side and an electrode for applying a voltage to the negative pole side are provided on the conveyor belt, and the positive pole high-voltage power source is changed to the positive pole-side electrode. In a recording medium transport apparatus that applies a voltage from the power supply member to the negative electrode, respectively, and attracts the recording medium by electrostatic force generated from the electrode of the transport belt, the current value output from the + high voltage power source is Measure the + pole current detection part and-Measure the current value output from the ultra high voltage power supply-Provide the pole current detection part, and if the current value detected in the current detection part does not increase when transporting the recording medium, electrostatic adsorption The paper type is determined to be impossible.

  According to a second aspect of the present application, if the current value detected by the current detection unit does not increase during conveyance of the recording medium, it is determined that the paper type cannot be electrostatically attracted, and conveyance of the recording medium is stopped. And

  According to a third aspect of the present application, if the current value detected by the current detection unit does not increase during conveyance of the recording medium, it is determined that the paper type cannot be electrostatically attracted, and the printing operation on the recording medium is stopped. It is characterized by.

  According to a fourth aspect of the present invention, there is provided a paper type that is provided with a retracting function in a printing apparatus that performs printing on a recording medium, and that cannot be electrostatically attracted unless the current value detected by the current detection unit increases during conveyance of the recording medium. And the printing apparatus is retracted.

  According to a fifth aspect of the present application, there is provided a humidifier that humidifies the recording medium, and humidifies the humidifier from the humidifier to the recording medium if the current value detected by the current detector does not increase during conveyance of the recording medium. It is characterized by performing.

  As described above, according to the present invention, recording that can be electrostatically attracted is performed by measuring a change in a current value output from a power source that applies a voltage to the conveyance belt when the recording medium is conveyed to the conveyance belt. It is possible to determine whether the medium is used.

  In the case of a recording medium that cannot be electrostatically attracted, post-processing such as transport stop, print stop, and head unit retreat can be performed to appropriately cope with transport failure and print failure. By telling the user that electrostatic attraction is not possible, it is possible to take measures such as changing the paper type.

  In addition, by providing a humidifying device, it is possible to prevent the electrostatic force from working effectively due to environmental fluctuations.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration diagram of a typical ink jet recording apparatus. In FIG. 1, the printing paper supply apparatus has the following configuration. A recording medium 101 that is a printing sheet is stored in a sheet feeding cassette 100. The pickup roller 102 is a roller for picking up the recording medium 101 from the paper feed cassette 100. The transport roller 302, the registration roller 303, and the paper discharge roller 304 are rollers for transporting the recording medium 101 on the transport path, and the separation device 129 has a function of separating the recording medium 101 from the transport belt 102, and the back surface. The paper discharge tray 132 stacks the printed recording media 101.

  The conveyance belt 102 is supported by a driving roller 311, a driven roller 312, and a belt sag prevention roller 313. A motor 111 is connected to the driving roller 311. When the motor 111 rotates, the driving roller 311 rotates to drive the conveyance belt 102. The belt sag prevention spring 104 is configured to apply a pressure to the belt sag prevention roller 313 so that a constant tension is applied to the conveyance belt 102. In addition, the conveyance belt 102 is provided with a high-voltage power supply unit 103 that applies a high voltage to the conveyance belt 102 and conveys the recording medium 101 by electrostatic adsorption.

  The head unit 200 is positioned on the upper side of the conveyor belt 102 and has six color printing heads mounted thereon. From the left, the sixth inkjet head 201 which is a yellow printing inkjet head, the fifth inkjet head 202 which is a magenta printing inkjet head, the fourth inkjet head 203 which is a cyan printing inkjet head, and the light magenta printing inkjet head. 3 inkjet heads 204, a second inkjet head 205 that is a light cyan printing inkjet head, and a first inkjet head 206 that is a black printing inkjet head. Each of the printing inkjet heads 201 to 206 has a nozzle portion 210 and is capped by cap units 220a and 220b when not printing. The cap units 220a and 220b can be opened and closed in the left-right direction 230a and 230b. The head unit 200 can move in the vertical direction indicated by the arrow 240 in accordance with the opening and closing of the cap units 220a and 220b.

  The double-side reversing mechanism 150 includes a reversing mechanism including a pre-reversing roller 305, a reversing roller 306, a post-reversing roller 307, a double-sided roller 308, and a path switching unit 350, and the front and back of the recording medium 101 printed on the conveyance belt 102. It has a function of reversing and feeding it onto the conveyor belt 102 again.

  Next, the operation will be described.

  At the start of printing, the head unit 200 once rises, moves the cap units 220a and 220b left and right to release capping, and then descends to the printing position. FIG. 2 shows a state in which the print head unit 126 is lowered to the printable position. The conveyance drive energy of the conveyance belt 102 is given by the drive motor 111 and starts to rotate. The conveyance driving energy of the conveyance roller 302, the registration roller 303, and the paper discharge roller 304 is given by another motor (not shown) and starts rotating.

  The recording medium 101 picked up by the pickup roller 102 from the paper feed cassette 100 is conveyed onto a conveyance belt 102 as a printing unit via a conveyance roller 302 and a registration roller 303. At this time, since the conveyance belt 102 is charged by the high voltage power supply unit 103, the recording medium 101 is electrostatically attracted to the conveyance belt 102. The recording medium 101 is printed with ink ejected from the inkjet heads 201 to 206 when passing under the inkjet heads 201 to 206. The recording medium 101 that has passed under the ink jet heads 201 to 206 is separated from the conveying belt 102 by the separation device 129, passes through the paper discharge roller 304, and is then discharged to the back paper discharge tray 132.

  FIG. 3 is a top view of FIGS. 1 and 2. This shows a state in which the recording media 101a and 101b on the conveying belt 102 are conveyed under the inkjet heads 201 to 206 in the conveying direction indicated by the arrows.

  Next, the operation during duplex printing will be described.

  The recording medium 101 printed with ink ejected from the ink jet heads 201 to 206 and passed under the ink jet heads 201 to 206 is conveyed to the double-side reversing mechanism 150 via the separation device 129. In the double-side reversing mechanism 150, it passes through the pre-reversing roller 305 and is conveyed to the reversing roller 306. When the trailing edge of the recording medium 101 passes the pre-reverse roller 305, the conveyance of the recording medium 101 is temporarily stopped. The path switching unit 350 switches the conveyance path toward the reverse roller 307. Next, the reverse roller 306 is rotated in the reverse direction before stopping, and the conveyance of the recording medium 101 is resumed. By this operation, the recording medium 101 is reversed. The recording medium 101 is temporarily stopped after being conveyed to the double-sided roller 308. The subsequent transport resumption timing is determined by the interval with the front recording medium 101, and the transport after a predetermined weight is resumed. The recording medium 101 that has resumed conveyance passes through the conveyance roller 302 and the registration roller 303, and is conveyed again onto the conveyance belt 102. After printing on the back surface, the recording medium 101 is separated from the conveyance belt 102 by the separation device 129, After passing, the paper is discharged to the back surface discharge tray 132.

  Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  In the embodiments described below, a printer is taken as an example of a recording apparatus using an inkjet recording method.

  In this specification, “printing” means not only the formation of significant information such as characters and figures, but also whether it is manifested so that it can be perceived visually by humans, regardless of significance. Regardless of the case, an image, a pattern, a pattern, or the like is widely formed on a recording medium, or the medium is processed.

  “Recording medium” refers not only to paper used in general recording apparatuses but also widely to cloth, plastic film, metal plate, glass, ceramics, wood, leather, and the like that can accept ink. Shall.

  Further, the term “ink” should be interpreted broadly in the same way as the definition of “recording” described above. When applied to a recording medium, it forms an image, a pattern, a pattern, etc., or processes the recording medium. It represents a liquid that can be subjected to the above processing (for example, coagulation or insolubilization of the colorant in the ink applied to the recording medium).

  A first embodiment according to the present invention will be described.

  FIG. 9 is a schematic configuration diagram in the first embodiment according to the present invention. A power supply brush 150 that applies a positive voltage and a power supply brush 150 that applies a negative voltage are in contact with the conveyor belt 102, and a voltage is applied to an electrode plate included in the conveyor belt 102 (not shown). is doing. The power supply brush 150 is connected to a positive electrode and a positive electrode power supply to the positive electrode and to a negative electrode to apply a high voltage supplied from the power supply to the conveying belt 102 via the power supply brush 150. Between the power supply brush 150 and the power source, an ammeter 156 for measuring a current value output from the power source is installed. The current value measured by the ammeter 156 is configured to be monitored by the control unit 162.

  FIG. 10 is a graph showing the current value measured by the ammeter 156 during conveyance of the recording medium. When the recording medium is not transported, it is in an open state in terms of electric circuit, and almost no current flows. However, when the recording medium is transported, a closed circuit is formed between the electrode and the recording medium, particularly when a high voltage is applied, and a slight current flows. That is, as shown in FIG. 10, the current waveform during the conveyance of the recording medium is a trapezoidal wave.

  The current value varies depending on the voltage to be applied, the area of the electrode, the material and thickness of the conveying belt, the area of the recording medium, and the like, but the applied voltage is 1 kV, the electrode width is 6 mm, the electrode on the comb teeth is 3 mm between the electrodes, and the material having the resistance value 10E11 It has been confirmed that a current of about 100 μA flows when transporting A4-size plain paper on a transport belt having a thickness of 100 μm.

  However, when a recording medium made of an insulating material that cannot be electrostatically attracted, such as a PET film, is transported, it is the same as an open state in terms of an electric circuit in which the recording medium is not transported. As shown, no current flows. That is, there is no change in the current value before and during conveyance of the recording medium.

  The control unit 162 monitors such a change in the current value, and if the current value measured by the ammeter 156 increases at the timing when the recording medium is transported onto the transport belt 102, it is determined that the paper type can be electrostatically attracted. On the contrary, if no change appears, it is determined that the paper cannot be electrostatically attracted. In addition, the current value varies depending on the voltage to be applied, the area of the electrode, the material and thickness of the conveying belt, the area of the recording medium, and the like. A determination may be made by providing a threshold value indicating that there is an increase.

  As described above, in the present embodiment, it is possible to determine the paper type that can be completely electrostatically attracted and transported because the current value that changes during transport of the recording medium is measured to determine whether or not electrostatic attracting is possible. .

  A second embodiment according to the present invention will be described.

  In the second embodiment, when the recording medium is transported onto the transport belt 102, if the current value measured by the ammeter 156 increases, it is determined that the paper type can be electrostatically attracted and the normal transport operation is continued. . Conversely, if there is no change, the paper is determined to be non-electrostatically attractable, and all or part of the recording medium conveyance operation is stopped, and control is performed so that post-processing similar to jam processing can be performed.

  That is, when the current value measured by the ammeter 156 does not change when the recording medium is conveyed as shown in FIG. 11, the operation described above with reference to FIG. A series of operations for picking up using the roller 102 and starting the conveyance of the recording medium is stopped.

  Further, at the same time when the conveyance is stopped, the control unit 162 may be configured to send a message notifying that the paper type cannot be conveyed and to prompt the user to warn. This message may be configured to be displayed on a display system of the printer main body, or may be configured to be transmitted to an apparatus such as a personal computer connected to the printer via an interface.

  In this embodiment, it is possible to prevent conveyance of paper that cannot be sucked by stopping conveyance of the recording medium.

  A third embodiment according to the present invention will be described.

  In the third embodiment, when the recording medium is transported onto the transport belt 102, if the current value measured by the ammeter 156 increases, it is determined that the paper type can be electrostatically attracted and the normal printing operation is continued. . Conversely, if no change appears, it is determined that the paper cannot be electrostatically attracted, and a series of operations of discharging from the head unit 200 and printing on the recording medium 101 is stopped.

  That is, when the current value measured by the ammeter 156 does not change during conveyance of the recording medium as shown in FIG. 11, the operation described above with reference to FIG. When passing below, a series of operations printed by the ink ejected from the inkjet heads 201 to 206 is stopped.

  At the same time as the printing is stopped, the control unit 162 may be configured to send a message notifying that the paper type cannot be conveyed, and to prompt the user to warn. This message may be configured to be displayed on a display system of the printer main body, or may be configured to be transmitted to an apparatus such as a personal computer connected to the printer via an interface.

  In this embodiment, it is possible to prevent printing defects caused by printing on paper that cannot be sucked by stopping the printing operation.

  A fourth embodiment according to the present invention will be described.

  In the fourth embodiment, when the recording medium is transported onto the transport belt 102, if the current value measured by the ammeter 156 increases, it is determined that the paper type can be electrostatically attracted and the normal printing operation is continued. . Conversely, if no change appears, it is determined that the sheet cannot be electrostatically attracted, and the head unit 200 is retracted to the retracted position or the cap position as shown in FIG.

  That is, when the current value measured by the ammeter 156 does not change when the recording medium is conveyed as shown in FIG. 11, the head unit 200 is started when the operation and printing described above with reference to FIG. Is lifted once, and the cap units 220a and 220b are moved to the left and right to cancel capping, and then the opposite operation of lowering to the printing position is performed. However, in this embodiment, the capping operation may be performed, or if the clearance between the conveyance belt 102 and the head unit 200 is sufficient, the capping is not performed and the operation may be stopped in the retracted state. .

  Further, at the same time when the head unit 200 is retracted, the control unit 162 may be configured to send a message notifying that the paper type cannot be conveyed and to prompt the user to be warned. This message may be configured to be displayed on a display system of the printer main body, or may be configured to be transmitted to an apparatus such as a personal computer connected to the printer via an interface.

  In this embodiment, by retracting the head unit 200, it is possible to prevent erroneous contact with the head unit 200 even when paper that cannot be sucked is conveyed.

  A fifth embodiment according to the present invention will be described.

  In the present embodiment, a humidifier that newly adjusts the humidity of the recording medium is provided between the paper feeding unit and the conveyor belt in the printer.

  If the current value measured by the ammeter 156 increases when the recording medium is transported onto the transport belt 102, it is determined that the paper type can be electrostatically attracted and the normal printing operation is continued. Conversely, if no change appears, it is determined that the paper cannot be electrostatically adsorbed, and the recording medium is humidified using a humidifier.

  Normal paper is greatly affected by humidity (absolute humidity). In particular, the resistance value of the paper increases in a low temperature and low humidity environment. As a result, the current value measured by the ammeter 156 is not changed during the conveyance of the recording medium as shown in FIG. 11, and the electrostatic adsorption conveyance becomes impossible. In such a case, the humidifier is turned on to humidify the recording medium. The humidifying environment is humidifying to room temperature and normal humidity (eg, 60 ° C. at 20 ° C.). If the current value measured by the ammeter 156 increases as a result of humidification of the recording medium, it is determined that the paper type can be electrostatically attracted, and the normal printing operation is continued. However, if no change appears, it is determined that the paper cannot be electrostatically attracted, and the post-processing as described above is executed.

  In this embodiment, by providing a humidifier and humidifying the recording medium, it is possible to prevent the electrostatic adsorption conveyance from being disabled due to environmental changes.

  A sixth embodiment according to the present invention will be described.

  In the sixth embodiment, the ammeter 156 shown in FIG. 9 is arranged only on either the positive pole side or the negative pole side.

  That is, when the recording medium is transported onto the transport belt 102, the current value measured by the ammeter 156 is basically the same as the absolute value except that the polarity is different on both the + pole side and the pole side. Therefore, even if the ammeter 156 is provided for either the positive pole side or the negative pole side, the above-described operation and processing can be performed.

Configuration of Inkjet Recording Device (Part 1) Configuration of Inkjet Recording Device (Part 2) 1 and 2 are top views of the ink jet recording apparatus transport unit of FIG. Illustration inside the conveyor belt View of the conveyor belt from above Positional diagram of conveyor belt and power supply brush View of the conveyor belt from the top View of endless belt viewed from the cross section (Part 1) Outline external view according to the present invention Current waveform during transport of electrostatically adsorbable media Current waveform during transport of media that cannot be electrostatically attracted

Explanation of symbols

31 Conveying Belt 32 Conveying Roller 33 Pinch Roller 34 Drive Roller 35 Pressure Roller 36 Adsorption Force Generation Unit 36a Electrode Plate 36b Electrode Plate 36c Base Layer 36d Surface Layer 36e Powered Member 51 Power Supply Brush 52a, 52b, 52c Power Supply Electrode 53 Support Member 100 Supply Paper cassette 101 Recording medium 102 Conveying belt 103 High voltage power supply unit 104 Balt sag preventing spring 111 Motor 129 Separating device 132 Paper discharge tray 150 Power supply brush 156 Ammeter 162 Control unit 200 Head unit 201 Sixth head (yellow)
202 5th head (magenta)
203 4th head (cyan)
204 3rd head (light magenta)
205 2nd head (light cyan)
206 1st head (black)
210 Nozzle 220a Cap 220b Cap 301 Pickup roller 302 Conveying roller 303 Registration roller 304 Paper discharge roller 305 Roller before reverse 306 Reverse roller 307 Roller after reverse 308 Double-sided roller 311 Drive motor 312 Drive roller 313 Belt deflection prevention roller 320 Platen 350 Path switch

Claims (5)

An electrode for applying a voltage to the + pole side and an electrode for applying a voltage to the -pole side are provided on the conveyor belt. In the recording medium conveying apparatus that applies a voltage via the electrode and sucks the recording medium by electrostatic force generated from the electrode of the conveying belt,
+ Measure the current value output from the ultra high voltage power supply + Provide the + polar current detection unit and-Measure the current value output from the ultra high voltage power source-Provide the polar current detection unit, the current value detected in the current detection unit A recording medium conveying apparatus that determines that the paper type cannot be electrostatically adsorbed unless it increases during conveyance of the recording medium.   2. The recording medium conveyance according to claim 1, wherein if the current value detected by the current detection unit does not increase during conveyance of the recording medium, it is determined that the paper type cannot be electrostatically attracted, and the conveyance of the recording medium is stopped. apparatus.   2. The recording according to claim 1, wherein if the current value detected by the current detection unit does not increase during conveyance of the recording medium, it is determined that the paper type cannot be electrostatically attracted, and the printing operation on the recording medium is stopped. Medium transport device.   A printing device that prints on a recording medium is provided with a retraction function, and if the current value detected by the current detection unit does not increase during conveyance of the recording medium, it is determined that the paper type cannot be electrostatically adsorbed, and the printing device is retreated. The recording medium carrying device according to claim 1.   The humidification device for humidifying the recording medium is provided, and if the current value detected by the current detection unit does not increase during conveyance of the recording medium, the humidification device performs humidification to the recording medium. Description recording medium conveying apparatus.

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