JP2004155563A - Recording medium conveying device and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording device for inexpensively recording high quality and high definition images by detecting the speed of a conveying belt for printing control. <P>SOLUTION: The recording device 1 uses the conveying belt 31 formed of a composite material with a suction force generating means, on which a scale 80 is provided as a discharge criterion for discharge control in synchronization with a detection signal. In the recording device 1, the scale 80 is provided near a thickness position where a belt criterion speed is established. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording medium conveyance device and a recording device that provide an encoder on a conveyance belt formed by laminating a plurality of materials to control print timing.
[0002]
[Prior art]
In general, an ink jet recording apparatus performs recording by ejecting ink from a recording head to a recording medium, so that the recording head can be easily made compact, high-definition images can be recorded at high speed, and running costs can be reduced. Inexpensive and non-impact methods have advantages such as low noise and easy recording of a color image using multicolor inks. Above all, a full line type apparatus using a line type recording head in which a number of ejection ports are arranged in the width direction of the recording medium can further increase the recording speed.
[0003]
However, in a full-line type apparatus having a large number of line-type print heads in the transport direction of the print medium, the distance from the print head at the most upstream position to the print head at the most downstream position becomes considerably long. Therefore, the recording medium is lifted in the recording area, which may cause a disorder of a recorded image or cause a jam or the like. Therefore, it is necessary to urge the recording medium downward so as not to rise. As a means therefor, there is generally known a method of providing an electrode, giving an electric charge to generate an electrostatic force, and adsorbing a recording medium.
[0004]
In such an ink jet recording apparatus, a recording medium fed by a sheet feeding device is adsorbed and held on an upper surface of a transport belt by an attracting force generating means provided on the transport belt in a recording area, and is recorded by a recording head. It is transported by the transport belt.
[0005]
Here, a conventional transport belt and a suction generating unit will be described with reference to FIGS.
[0006]
First, the configuration around the conveyor belt will be briefly described with reference to FIG.
[0007]
In FIG. 7, reference numeral 131 denotes a transport belt that moves while adsorbing and holding the recording paper P, and is made of a 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. Has formed. Attraction force generating means 136 described below is installed on the transport belt 131, and a voltage of about 0.5 kV to 10 kV is applied to a power supply brush 152 that is joined to the transport belt 131, so that a recording unit below each recording head 107 can be used. This is to generate a suction force on the transport belt 131. The power supply brush 152 is connected to a high-voltage power supply (not shown) that generates a predetermined high voltage.
[0008]
132, 134, and 135 are rollers that support the transport belt 131 and apply an appropriate tension. The rollers 134 are connected to a paper feed motor 160. Reference numeral 150 denotes an encoder which is provided at an end of the roller 134 and outputs a signal proportional to the rotation speed for controlling printing timing and belt conveyance speed, which will be described later. Further, a paper pressing roller 140 as pressing means for pressing the recording paper P against the transport belt is rotatably mounted on the support member 139, and the paper pressing roller support member 139 is mounted around the rotation axis of the pinch roller 133 as a rotation center. The paper pressing roller 140 is urged toward the transport belt 131 by urging means (not shown).
[0009]
Reference numeral 138 denotes a cleaning roller pair, which is provided so as to be pressed between the belts 131. The cleaning roller pair 138 is capable of absorbing ink to remove dirt such as ink attached to the belt 131, and has a pore diameter for preventing deterioration in durability. Of small cells (preferably 10 μm to 30 μm).
[0010]
After the transport belt 131 is cleaned by the cleaning roller pair 138, the charge is removed by a charge removing brush 137 serving as a charge removing unit.
[0011]
Next, the suction force generating means 136 will be described with reference to FIGS. 8, 9 and 10. FIG. FIG. 8 is a diagram viewed from the direction of arrow f in FIG. 7, and is an explanatory diagram showing an electrode pattern and the like of the suction force generating portion provided on the conveyor belt 131. FIG. 9 is a cross-sectional view of FIG. FIG. 9 is a cross-sectional view as viewed from the direction of arrow b in FIG.
[0012]
8, 9, and 10, an attraction force generating unit 136 is provided inside the transport belt 131. The attracting force generating means 136 is composed of an electrode plate 136a and a ground plate 136b made of a conductive metal, and each tooth has a comb-like shape independently as shown in the figure, and faces in a direction orthogonal to the belt conveying direction. As shown in FIG.
[0013]
Terminals 136a 'and 136b', which are power-supplied portions with exposed patterns, are provided at both ends in the movement direction of the conveyor belt 131 with a distance longer than the width of each electrode 136a and 136b in the belt movement direction. In addition, a conductive power supply brush 152 that contacts each with a predetermined pressure is provided, and a positive or negative voltage is applied to a terminal 136a ′ of the electrode plate 136a by a high-voltage power supply (not shown), and a terminal 136b of the ground plate 136b is applied. 'Is dropped to ground.
[0014]
As shown in FIGS. 9 and 10, the conveying belt 131 has an attraction force generating area in which an attraction force generating means 136 composed of an electrode plate 136a made of a conductive metal and an earth plate 136b has a base layer 136c and a surface layer. 136d and is provided in a sandwiched manner. The base layer 136c is made of a high-molecular synthetic resin such as polyethylene, polycarbonate, or polyimide, and the surface layer 136d is made of a synthetic resin such as a fluorine-based resin capable of controlling resistance to generate an optimal electrostatic force.
[0015]
When a voltage is applied to the electrode plate 136a, an electric force is generated in the direction of the arrow in FIG. 9, and the lines of electric force as shown in FIG. 9 are formed. Then, due to the potential difference between the electrode plate 136a and the ground plate 136b, an attraction force is generated at a position above the transport belt 131, and the recording surface of the recording paper P has the same polarity as the voltage applied to the electrode plate 136a. Charge (surface potential) is generated.
[0016]
In addition, as for the attraction force of the recording paper P, a portion where there is no conductive metal between the electrode plate 136a and the ground plate 136b is the lowest region.
[0017]
When a large amount of ink is ejected onto the recording paper P, the recording paper P swells, and undulation (cockling) occurs. In this case, the cockling of the recording paper P is generated in a region where the conductive metal is not present between the electrode plate 136a and the ground plate 136b, which is the above-described area having the lowest attraction force, so that the recording paper P has the head 107 side. Floating to the minimum can be minimized.
[0018]
Next, print timing control will be described with reference to FIG.
[0019]
An encoder 150 provided on the roller 134 has an encoder Ach 150a and an encoder Bch 150b arranged at positions where the encoder wheel 152 disposed outside the roller gear 151 coupled to the paper feed motor 160 is sandwiched by the roller as an axis object. The upper scale is detected and a signal is generated synchronously with it. Scales are arranged on the encoder wheel 152 so as to be synchronized with the timing at which ink is ejected. In the present embodiment, 2000 scales / circle are arranged.
[0020]
At the time of the printing operation, when the drive of the motor 160 is transmitted to the roller gear 151 and the roller 134 starts rotating immediately and immediately, a signal synchronized with each scale is output from the encoder 150.
[0021]
However, as shown in FIGS. 11B and 11C, a signal including the influence of a fitting error at the time of assembling the roller 134 and the encoder wheel 152 is generated, and a signal synchronized with the original rotation of the roller is obtained. I can't.
[0022]
Therefore, a correction circuit 153 is provided to input the signals of the respective encoders, process the pulse signal interval tAn (μsec) of Ach and the pulse signal interval tBn (μsec) of Bch, and perform averaging of (tAn + tBn) / 2. By outputting the signal with the above, a signal from which the influence of fitting has been removed is obtained. By doing so, it is possible to obtain a signal synchronized with the original rotation of the roller. By performing ejection by each head in synchronization with this signal, high-precision printing which is not affected by conveyance unevenness related to the drive system such as the motor 160, the roller gear 151, and the drive transmission unit can be performed.
[0023]
[Problems to be solved by the invention]
2. Description of the Related Art Conventionally, in order to obtain high-definition image quality, an inkjet recording apparatus has been required to convey with high accuracy while keeping the distance between a recording sheet and a recording head close and constant. In particular, in a 1-PASS high-speed recording apparatus using a line head, the interval between the recording paper and the recording head is a factor directly affecting the image quality. Therefore, the recording paper can be adsorbed and conveyed to the conveyance belt by the conveyance belt provided with the suction generation means by the electrodes.
[0024]
However, since the transport belt provided with the suction generating means is made of a plurality of materials, the thickness of the transport belt is more uneven than that of a single material in manufacturing, and this is a factor that causes uneven transport accuracy. Would.
[0025]
Further, in the speed detection by the encoder wheel disposed on the roller 160 as described in the above-mentioned conventional example, it is not possible to remove the influence of the fluctuation of the roller itself, the speed fluctuation caused by the uneven thickness of the belt, and the like. For this reason, a method has been proposed in which the influence is eliminated by measuring the influence beforehand in the correction circuit and performing the correction before the printing operation.However, it is not possible to eliminate the influence of sudden speed fluctuation due to the slip of the roller and the belt. A method of detecting the speed of the belt or the recording paper by means of a razor or the like (a Doppler speed measuring device) is conceivable. However, there is a problem that the measuring device is very expensive.
[0026]
In view of the above, the present invention has been made in view of the above-described problems, and an object of the present invention is to detect a speed of a conveyor belt and perform printing control to enable high-quality and high-definition images. An object of the present invention is to make it possible to provide a recording device at low cost.
[0027]
[Means for Solving the Problems]
A typical configuration of the present invention for achieving the above object is a transport belt composed of a composite material provided with an attraction force generating means, provided with a scale as a discharge reference on the belt, and discharging in synchronization with a detection signal. In a recording apparatus for performing control, a scale is provided near a thickness position at which a belt reference speed is obtained.
[0028]
In addition, reading is performed by a reading sensor which is perpendicular to the belt conveyance direction and is disposed on the drive roller shaft.
[0029]
With the above configuration, high-quality, high-definition images can be realized with an inexpensive configuration by discharging and forming an image at a timing synchronized with the conveyor belt speed.
[0030]
As described above, the present invention can be summarized into the following configuration by organizing and summarizing the present invention.
[0031]
(1) A recording medium is attracted by applying a voltage to an electrode provided on a transport belt formed by laminating a plurality of materials, and print timing control is performed in synchronization with a signal from an encoder provided on the belt. In a recording medium transport device that performs image formation by
A recording medium transport device comprising an encoder provided at a belt speed reference position.
[0032]
(2) The recording medium transport device according to (1), wherein each of the plurality of materials in the transport belt has a laminated structure.
[0033]
(3) The recording medium transport device according to (1), wherein the recording unit is an ink jet system.
[0034]
(4) The recording medium transport device according to (1), wherein the encoder is perpendicular to the belt transport direction and is disposed on a drive roller shaft.
[0035]
(5) A recording medium is attracted by applying a voltage to an electrode provided on a transport belt formed by laminating a plurality of materials, and print timing control is performed in synchronization with a signal from an encoder provided on the belt. In a recording medium transport device that performs image formation by
A recording apparatus comprising an encoder provided at a belt speed reference position.
[0036]
(6) The recording apparatus according to (5), wherein each of the plurality of materials in the transport belt has a laminated structure.
[0037]
(7) The recording apparatus according to (5), wherein the recording unit is an ink jet system.
[0038]
(8) The recording apparatus according to (5), wherein the encoder is perpendicular to the belt conveyance direction and is disposed on a drive roller shaft.
[0039]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a recording medium transport apparatus to which the present invention is applied will be described in detail with reference to the drawings. In the following embodiments, a recording medium transport device used in an inkjet recording device that performs recording by discharging ink is illustrated.
[0040]
[First Embodiment]
A recording apparatus including a recording medium transport device according to the first embodiment will be specifically described with reference to the drawings.
[0041]
First, the overall configuration of the recording apparatus will be described with reference to the drawings. A recording apparatus having an automatic paper feeder includes a paper feed unit, a transport belt unit, a paper discharge unit, and a print head unit.
[0042]
FIG. 6 is a cross-sectional view showing the overall configuration of the recording apparatus 1. The paper supply unit, the conveyance belt unit, the recording head unit, and the paper discharge unit will be described with reference to FIG.
[0043]
The paper feed unit has a configuration in which a pressure plate 21 on which recording paper P as a recording medium is loaded and a feed rotator 22 for feeding the recording paper 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 a 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 artificial skin, for preventing double feeding of the recording paper P is provided at a portion of the pressure plate 21 facing the feeding rotating body 22. Further, the base 20 covers a corner in one direction of the recording paper P, a separation claw 26 for separating the recording paper P one by one, and a release mechanism for releasing the contact between the pressure plate 21 and the feeding rotating body 22 (not shown). Release cam is provided.
[0044]
In the above configuration, in the standby state, the release cam pushes the pressure plate 21 down to a predetermined position. Thereby, the contact between the pressure plate 21 and the feeding rotating body 22 is released. In this state, when the driving force of the transport roller 32 is transmitted to the feed rotator 22 and the release cam by a gear or the like, the release cam separates from the pressure plate 21 and the pressure plate 21 rises, and the feed rotator The recording paper P is brought into contact with the recording paper P, and the recording paper P is picked up by the rotation of the feeding rotating body 22, starts to be fed, is separated one by one by a separation claw 26, and is sent to the transport belt unit 3. The feed rotator 22 rotates until the recording paper P is fed into the transport belt unit 3, and is again in a standby state where the contact between the recording paper P and the feed rotator 22 is released, and the driving force from the transport roller 32 is reduced. Cut off.
[0045]
Reference numeral 90 denotes a feeding rotating body for manual sheet feeding. The recording paper P set on the manual feed tray 91 is fed by a feed rotating body 90 in accordance with a recording command signal of a computer, and is transported to a transport roller 32.
[0046]
The transport belt section 3 has a transport belt 31 that adsorbs and transports the recording paper P, and a PE sensor (not shown). The transport belt 31 is driven by a drive roller 34 and is wound around a transport roller 32 and a pressure roller 35 which are driven rollers.
[0047]
The transport 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 an arm 50 that is swingably attached to the platen 30 at one end. The tension is applied (2.0 kgf) to the transport belt 31 by the arm 50 being pressed by the spring 51. Further, the platen 30 is located below the transport belt 31 and serves to regulate the downward displacement of the transport belt 31.
[0048]
A pinch roller 33 that is driven by the transport belt 31 is provided at a position facing the transport roller 32. The pinch roller 33 is pressed against the transport belt 31 by a spring (not shown) to guide the recording paper P to the recording head unit 7. Further, an upper guide 27 and a lower guide 28 for guiding the recording paper P are provided at an entrance of the transport belt unit 3 to which the recording paper P is transported. Further, the upper guide 27 is provided with a PE sensor lever 23 for transmitting detection of the leading and trailing edges of the recording paper P to a PE sensor (not shown). Further, a recording head unit 7 that forms an image based on image information is provided downstream of the transport roller 32 in the recording paper transport direction.
[0049]
In the above configuration, the recording paper P sent to the conveyor belt unit 3 is guided by the upper guide 27 and the lower guide 28 and is sent to a pair of rollers including a conveyance roller 32 and a pinch roller 33. At this time, the leading end of the conveyed recording paper P is detected by the PE sensor lever 23 to determine the printing position of the recording paper P. The recording paper P is conveyed by the rotation of the conveyance belt 31 via the conveyance rollers 32 by the paper feed motor.
[0050]
Reference numeral 38 denotes a cleaning roller pair, which is provided so as to be pressed between the belts 31. The cleaning roller pair is capable of absorbing ink to remove dirt such as ink adhered to the belt 31, and has a pore diameter for preventing deterioration in durability. Of small cells (preferably 10 μm to 30 μm).
[0051]
After the transport belt 31 is cleaned by the cleaning roller pair 38, the charge is removed by a charge removing brush 37 serving as a charge removing unit.
[0052]
As the recording head unit 7 as a recording unit, a line type ink jet recording head in which a plurality of nozzles are arranged in a direction orthogonal to the transport direction of the recording paper P is used. ), 7C (cyan), 7M (magenta), and 7Y (yellow) in this order, and the recording heads 7K, 7C, 7M, and 7Y are mounted on a head holder 7a. This recording head can apply heat to the ink by a heater or the like. The ink causes film boiling due to the heat, and ink is ejected from the nozzles of the recording head by a pressure change caused by growth or shrinkage of bubbles due to the film boiling, and an image is formed on the recording paper P.
[0053]
One end of the recording head unit 7 is rotatably fixed by a shaft 71, the protrusion 7 </ b> B formed at the other end is engaged with the rail 72, and the distance (paper interval) between the nozzle surface and the recording paper P is reduced. It is stipulated.
[0054]
The paper discharge unit 4 includes a paper discharge roller 41 and a spur 42. The recording paper P, on which an image is formed by the recording head unit 7, is conveyed by being sandwiched between the paper discharge roller 41 and the spur 42 and is discharged. Is discharged to Reference numeral 41 denotes a paper discharge roller, which is driven by the rotational force of the drive roller 34 by a transmission unit (not shown). Since the spur 42 rolls on the printed surface after recording, the contact area with the recording paper is small, so that even if the spur 42 contacts the printed surface after recording, the recorded image of the recording paper is not disturbed. Things.
[0055]
Next, the transport belt 31 used in the present recording apparatus will be described.
[0056]
The conveyance belt 31 that moves while adsorbing and holding the recording paper P has an adsorbing force generating unit 36 composed of an electrode plate 36a made of a conductive metal and an earth plate 36b in the attraction force generating region. Protected in a sandwiched form. The base layer 36c is made of a high-molecular synthetic resin such as polyethylene, polycarbonate, and polyimide, and the surface layer 36d is made of a synthetic resin such as a fluorine-based resin whose resistance can be controlled in order to generate an optimal electrostatic force. The conveying belt 31 is provided with a suction force generating means substantially equivalent to the above-described conventional example (see FIG. 8). That is, the transport belt 31 is composed of an attraction force generating means using a comb-tooth electrode composed of an electrode plate 36a and an earth plate 36b, a base layer 36c, and a surface layer 36d. Are joined. By applying a voltage of about 0.5 kV to 10 kV to the power supply brush 52 joined to the transport belt 31, an attractive force is generated on the transport belt 31 at a recording position below each recording head 7. The power supply brush 52 is connected to a high-voltage power supply (not shown) that generates a predetermined high voltage.
[0057]
Next, the configuration of the transport belt 31 according to the first embodiment of the present invention will be described in more detail with reference to FIGS. 1, 2, and 3. 1 is a top view of the conveyor belt, FIG. 2 is a schematic side cross-sectional view of the conveyor belt, and FIG. 3 is a schematic cross-sectional side view of the conveyor belt.
[0058]
Inside the conveyor belt 31, a suction force generator 36 is provided. The attraction force generating means 36 is composed of an electrode plate 36a and a ground plate 36b made of a conductive metal, and each tooth has a comb-like shape independently as shown in the figure, and faces in a direction orthogonal to the belt conveyance direction. As shown in FIG.
[0059]
Terminals 36a 'and 36b', which are power-supplied portions each having an exposed pattern, are provided at both ends in the movement direction of the conveyor belt 31 at a distance longer than the width of each electrode 36a and 36b in the belt movement direction. A positive or negative voltage is applied to the terminal 36a 'of the electrode plate 36a by a high-voltage power supply (not shown) by a conductive power supply brush 52 that contacts each with a predetermined pressure, and the terminal 36b' of the ground plate 36b is Dropped to earth.
[0060]
Then, as shown in FIGS. 2 and 3, the conveying belt 31 has an attraction force generating region in which an attraction force generating means 36 composed of an electrode plate 36a made of a conductive metal and an earth plate 36b is connected to a base layer 36c and a surface layer. 36d and is provided in a sandwiched manner. The base layer 36c is made of a functional material made of a high-molecular synthetic resin such as polyethylene, polycarbonate, or polyimide, which has suitable stretchability, durability, and heat resistance in consideration of the transport accuracy. The surface layer 36d is made of a synthetic resin such as a fluorine-based resin whose resistance can be controlled to generate an optimal electrostatic force.
[0061]
Scales 80 according to the present invention are provided outside the terminals 36a 'at intervals of image resolution (600 dpi: about 43 μm) in the transport direction. The scale 80 is provided with a V-shaped groove corresponding to the reflection type sensor. A signal obtained by reading the scale on the belt by the reflection type sensor 55 and synchronizing with the reflection type sensor 55 arranged at a position perpendicular to the conveyance direction above the driving roller 34 is provided. It is output as a head timing signal. By doing so, it is possible to detect the accurate transport speed with a simple configuration without being affected by the warpage of the belt end due to the difference in contraction that occurs during manufacture of the belt made of the composite material. Each recording head 7 arranged on the belt forms an image by discharging in synchronization with this signal.
[0062]
Next, the reference speed in belt conveyance will be described.
[0063]
When the belt is conveyed by rotating the drive roller 34, in the case of a belt made of a single material, the belt is curved on the periphery of the drive roller 34 and minute expansion and contraction occurs in the cross section of the belt. In the case of the same material, uniform stress is generated due to the same elastic modulus, and expansion and contraction occurs accordingly.Therefore, there is a position where there is no expansion and contraction at an intermediate position in the belt thickness direction. Position. That is, for example, when a single material belt having a belt thickness of 0.2 mm is transported to a roller having a diameter of 30 mm, the transport belt is transported at a speed of 30/2 + 0.2 / 2 = 15.1 mm from the center of the roller. Will be.
[0064]
However, in the transport belt made of the composite material of the present apparatus provided with the suction force generating means, the base layer 36c and the surface layer 36d have different elastic coefficients, so that the speed reference position is shifted from the intermediate position. As the base layer 36c, a material having a high elastic coefficient value is used from the viewpoint of ensuring the transport accuracy and durability. In the surface layer 36d, the resistance value for generating the attraction force is given the highest priority. Is not always the case. It is also conceivable to apply a coating on the upper layer of the surface layer 36d in consideration of the wear resistance of the surface layer 36d, so that it is impossible to use a more uniform material. For this reason, the speed reference position changes depending on the material and each thickness, and it is difficult to accurately convey and form an image synchronously therewith.
[0065]
FIG. 4 is a graph of the reference speed position and the respective expansion and contraction when the base layer 36c and the surface layer 36d are made of different materials and have different elastic coefficients. The upper and lower areas at the speed reference position are expansion and contraction stresses generated inside the belt, and are equal to each other. At that position, elongation occurs above the speed reference position, and compression is performed below (the belt side), and is maintained at a constant value at the reference position.
[0066]
In the present embodiment, by providing the scale 80 on the belt at this speed reference position, accurate speed detection is possible even at a position with little expansion and contraction and curvature.
[0067]
FIG. 5 is a cross-sectional view showing the structure of the belt. The base layer 36c is formed by winding the same sheet material (20 μm) made of a thermoplastic resin and a thermosetting resin a plurality of times (five times) and heat-welding it to 100 μm. Thick belts are manufactured. A belt is completed by wrapping a thermosetting surface layer material around the outside of the laminate and heat-sealing it. In this step, by forming the electrode portion and the scale on the sheet so as to be arranged at predetermined positions in the form of the base layer sheet material, each is arranged at a predetermined thickness position of the belt. .
[0068]
Actually, in the present embodiment, the scale is formed at the position corresponding to the fourth layer of the base layer 36c, and the electrode plate is formed at the position corresponding to the fifth layer into a thermoplastic resin portion at the stage of the sheet material, and is processed into a belt shape using the same. By manufacturing belts.
[0069]
In the belt made of the composite material as described above, the scale 80 is provided at the reference speed position, and the scale 80 is detected and the discharge is performed in synchronization with the scale 80, thereby achieving high image quality and high definition without being affected by the edge warpage and the curvature. It is possible to provide a recording device with a simple configuration.
[0070]
【The invention's effect】
As described above, according to the present invention, it is possible to inexpensively provide a recording apparatus that enables high-quality and high-definition images by detecting the speed of a conveyor belt and performing printing control. Can be.
[Brief description of the drawings]
FIG. 1 is a top view of a conveyor belt unit according to the present invention.
FIG. 2 is a schematic side cross-sectional view of a conveyor belt according to the present invention.
FIG. 3 is a schematic cross-sectional side view of a conveyor belt according to the present invention.
FIG. 4 is a graph of reference speed position and respective expansion and contraction when elasticity coefficients are different.
FIG. 5 is a sectional view showing the structure of the belt.
FIG. 6 is a cross-sectional view illustrating an overall configuration of an inkjet recording apparatus.
FIG. 7 is a cross-sectional view illustrating a configuration of a conveyance belt unit of the inkjet recording apparatus.
FIG. 8 is a view of the suction force generating unit of the recording apparatus as viewed from the direction of arrow f in FIG. 7;
FIG. 9 is a cross-sectional view as viewed from the direction of arrow a in FIG.
FIG. 10 is a cross-sectional view as viewed from the direction of arrow b in FIG.
11A, 11B, and 11C are diagrams showing print timing control of a conventional transport device.
[Explanation of symbols]
P Recording paper
a Rotating axis
1 Recording device
2 Paper feed unit
3 Conveyor belt
4 Paper output unit
7 Recording head
7a Head holder
7B Projection
7K, 7C, 7M, 7Y recording head
20 base
21 Pressure plate
22 Feed rotating body
23 PE sensor lever
24 Pressure plate spring
25 Separation pad
27 Upper guide
28 Lower Guide
30 Platen
30a convex
30b surface
31 Conveyor belt
32 Transport roller
33 Pinch roller
34 drive roller
35 pressure roller
41 Paper ejection roller
42 spurs
43 Output tray
50 arm
51 spring
71 axes
72 rails
90 Feed rotating body
91 Bypass Tray

Claims (8)

By applying a voltage to an electrode provided on a transport belt configured by laminating a plurality of materials, a recording medium is attracted, and printing timing control is performed in synchronization with a signal of an encoder provided on the belt, thereby forming an image. In a recording medium transport device for forming,
A recording medium transport device comprising an encoder provided at a belt speed reference position. 2. The recording medium conveying device according to claim 1, wherein each of the plurality of materials in the conveying belt has a laminated structure. 2. The recording medium transport device according to claim 1, wherein said recording means is of an ink jet type. 2. The recording medium conveying apparatus according to claim 1, wherein the encoder is perpendicular to the belt conveying direction and is disposed on a drive roller shaft. By applying a voltage to an electrode provided on a transport belt configured by laminating a plurality of materials, a recording medium is attracted, and printing timing control is performed in synchronization with a signal of an encoder provided on the belt, thereby forming an image. In a recording medium transport device for forming,
A recording apparatus comprising an encoder provided at a belt speed reference position. The recording apparatus according to claim 5, wherein each of the plurality of materials has a laminated structure in the transport belt. 6. The recording apparatus according to claim 5, wherein said recording means is of an ink jet type. 6. The recording apparatus according to claim 5, wherein said encoder forms a right angle with the belt conveyance direction and is disposed on a drive roller shaft.

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