JPH11151843A - Recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To limit an absorptive force generating means to operate only in a recording region by arranging adsorptive force generating means formed with a transportation belt integrally and having combteeth like electrodes disposed opposite to its teeth being formed respectively independently, feeding means for feeding electric power to the feeding part of electrodes, and the like. SOLUTION: The transportation belt 16 has adsorptive force generating means 31 installed with a set of electrode plates 32 formed of electrification metal and an earth plate 33. The electrodes 32 and earth 33 are respectively formed in a combteeth shape having each tooth formed independently, and installed in an inner part of the transportation belt 16 in a manner that they are set face to face in the direction intersecting to the transportation direction of the transportation belt 16 and each projection comes in each recess. In both sides of the movement direction of the transportation belt, the electrode plate 32 and earth plate 33 have feeding parts (pattern-exposed parts) 32a, 33a respectively. These feeding parts 32a, 33a are set having a longer distance than a width of the earth plate 33, and feeding brushes are brought in contact therewith respectively with predetermined pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus for recording an image by discharging ink, and more particularly to a mechanism for transporting a recording medium at a position where an image is recorded by a recording head.

[0002]

2. Description of the Related Art In general, an ink jet recording apparatus performs recording by ejecting ink from a recording head to a recording medium. It is easy to make the recording head compact and to record a high-definition image at a high speed. It has advantages such as low running cost, low noise due to the non-impact method, and easy recording of a color image using multicolor inks. Among them,
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 sheet can further increase the recording speed.

However, in a full-line type apparatus,
The distance from the recording head at the most upstream position to the recording head at the most downstream position becomes considerably long. Therefore, if the recording sheet rises in the recording area, the recorded image may be disturbed or a jam may occur. Therefore, it is necessary to urge the recording sheet downward so as not to rise.

As a means for urging the recording sheet, a method of attracting the recording sheet using electrostatic force is generally known. In such an inkjet recording apparatus, an electrostatic attraction plate made of a conductive electrode is provided on a platen in a recording area, and an electrostatic force is generated by applying a charge. The recording sheet fed from the feeding device by this electrostatic force is sucked and held on the upper surface of the conveyance belt, and is conveyed while being recorded by the recording head.

An example of a conventional ink jet recording apparatus will be described with reference to the drawings. FIG. 11 is an overall configuration diagram of a conventional ink jet recording apparatus, FIG. 12 is a partially enlarged view of the conventional ink jet recording apparatus as viewed from above, and FIGS.

In the image recording apparatus 70 shown in FIG. 11, a recording sheet P, which is a recording medium, is stacked on a feeding section 71 and fed one by one from above by a feeding roller 72. The fed recording sheet P is guided by the lower conveyance guide 73, and is nipped by the conveyance belt 74 and the pinch roller 75. The transport belt 74 is driven by a drive roller 77 driven by a drive source such as a pulse motor (not shown), and transports the recording sheet P to a printing start position on a platen 76.

The transport belt 74 includes a driving roller 77 and a driven roller.
It is stretched by 78 and a pressure roller 79. A suction force generating means 80 is attached to the platen 76 by adhesion, and is located below the conveyor belt 74. The pressure roller 79 is rotatably attached to the other end of an arm 83 pivotally attached to the platen 76 at one end, and the arm 83 is pressed by a spring 84 to apply tension to the transport belt 74. doing.

The recording head 85 is a full line type in which a plurality of recording elements are arranged over the entire width of the recording area of the recording sheet P. 85K (black), 85C recording head for each color
(Cyan), 85M (magenta), and 85Y (yellow) are arranged at predetermined intervals from the upstream side in the transport direction of the recording sheet P, and attached to the head holder 85a.

FIG. 12 is a view of the recording apparatus as viewed from above, and as shown in FIG.
Assuming that 1, the suction force generating means 80 below the conveyor belt 74 has a size S that covers the occupied area S1. As shown in FIG. 13A, the attraction force generating means 80 includes a pair of electrode plates 81 and a ground plate 82 made of a conductive metal. The electrode plate 81 and the earth plate 82 are both formed in a comb shape and are arranged so that the respective convex portions enter the concave portions, and a positive or negative voltage is applied to the power supply portion 81a of the electrode plate 81, The feeder 82a of the ground plate 82 is grounded.

FIG. 13B is a diagram showing a-
FIG. 3 is a cross-sectional view of FIG. As shown in the figure, the suction force generating means 80 is protected in such a manner that the electrode plate 81 and the earth plate 82 are sandwiched between the base layer 80a and the surface layer 80b, and the transport belt 74 is located above the surface layer 80b. ing. The base layer 80a and the surface layer 80b are made of a synthetic resin such as polyethylene and polycarbonate.

In the above configuration, the recording sheet P
Is attracted to the upper surface of the transport belt 74 by the attraction force generating means 80, and is transported by the transport belt 74 while being recorded by the recording head 85.

The recording sheet P on which an image has been recorded is nipped and conveyed by a discharge roller 86 and a spur 87 pressed against the discharge roller 86, and discharged to a discharge tray 88 to be stored. The discharge roller 86 is driven by the rotational force of the driven roller 78 by a transmission unit (not shown). Further, the spur 87 has a pointed shape so that the ink of the recorded image does not transfer as much as possible in order to transfer the recording surface.

As another conventional structure, the platen
The electrode plate 81 and the ground plate 82 are integrally provided in the transport belt 74 with the same configuration as the suction force generating means 80 provided in 76, and a positive or negative voltage is applied from one of the widthwise ends of the transport belt 74. In some cases, the other is grounded, and the conveyor belt itself is used as an attraction force generating means.

[0014]

However, in the above-described conventional ink jet recording apparatus, the recording head 85 provided with a pair of comb-shaped electrode plates 81 and an attraction force generating means 80 using a ground plate 82 is provided on a platen. The size S covering the occupied area S1 is an area that can be adsorbed. For this reason, a large torque is required for the drive motor that transports the transport belt 74, and a larger motor is required, resulting in a large power consumption and a high cost.

Further, the above-described structure in which the conveying belt 74 itself is integrally provided with the suction force generating means 80 generates the suction force even in a region other than the recording area immediately below the recording head 85 of the conveying belt 74. . For this reason, the recording sheet P
The conveyor belt 74 is also used at the separation section from
, And could not be reliably separated.

As described above, the conventional recording apparatus generates an attracting force even in an unnecessary portion, so that it is a device that consumes unnecessary power, has a large energy loss, and is very inefficient. Further, in general, in the case of a comb-shaped electrode, if the energizing time to the electrode is prolonged, the electrode portions of the base layer 80a and the surface layer 80b protecting the electrode (particularly, the corner portion 80c of the electrode) are deteriorated and pinholes are generated However, since the life of the suction force generating means is shortened, the above-described conventional apparatus is not excellent in durability of the suction force generation means.

In view of the above problems, it is an object of the present invention to provide a recording apparatus in which an attraction force generating means is operated only in a recording area of a recording head and a torque required for a drive motor of a transport belt is reduced. Is to do.

[0018]

In order to solve the above-mentioned problems, a typical configuration of a recording apparatus according to the present invention includes a recording head for recording an image on a recording medium, and a transport for transporting the recording medium. A belt, an attraction force generating means in which comb-shaped electrodes formed integrally with the transport belt and having their respective teeth independent are arranged facing each other, and the electrodes provided on both sides in the moving direction of the transport belt. Power supply means for supplying power to a power supply unit, wherein the power supply means is configured to supply power to the attraction force generating means only in the vicinity of a recording area of the recording head.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An embodiment of a recording apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating the overall configuration of the image recording apparatus according to the present embodiment, FIG. 2 is a cross-sectional view illustrating the configuration of a feeding unit of the image recording apparatus, FIG. FIG. 5 is a plan view of the suction force generating means provided on the transport belt, FIG.
FIG. 6 is a side view illustrating a power supply member that supplies power to the transport belt.

An image recording apparatus 1 having an automatic feeding device is
(A) feeding section 2, (B) transport section 3, (C) recording section 5,
(D) The discharge unit 4 is configured. Hereinafter, each will be described in order.

(A) Feeding Unit The feeding unit 2 has a configuration in which a pressure plate 7 for stacking the recording sheets P and a feeding roller 10 for feeding the recording sheets P are attached to the base 6. The pressure plate 7 is rotatable about a rotation shaft 7 b connected to the base 6, and is urged by a pressure plate spring 8 to the feed roller 10. A separation pad 7a made of a material having a large coefficient of friction, such as artificial skin, for preventing double feeding of the recording sheet P is provided at a portion of the pressure plate 7 facing the feeding roller 10.

Furthermore, the base 6 covers a corner in one direction of the recording sheet P, and the contact between the separation claw 9 for separating the recording sheet P one by one, the pressure plate 7 and the feeding roller 10 is released. Release cam (not shown) is provided.

In the above configuration, in the standby state, the release cam pushes down the pressure plate 7 to a predetermined position to release the contact between the pressure plate 7 and the feeding roller 10. When the driving force of the transport roller 18 is transmitted to the feed roller 10 and the release cam by a gear or the like, the release cam separates from the pressure plate 7 and the pressure plate 7 rises, so that the recording sheet P comes into contact with the feed roller 10. . The recording sheet P is picked up by the rotation of the feeding roller 10, separated by the separation claw 9 one by one, and fed to the transport unit 3. The feed roller 10 rotates until the recording sheet P is fed into the conveying unit 3, and is again in a standby state in which the contact between the recording sheet P and the feed roller 10 is released.
The driving force from 18 is cut off.

A manual feed tray 11 is provided on the side of the recording apparatus 1. The recording sheets P stacked on the manual feed tray 11 are fed by a manual feed feeding roller 12 that rotates in accordance with a recording command signal from a computer or the like, and are guided by a lower guide 13 and an upper guide 14 so as to be transported. 3

(B) Conveying Unit The conveying unit 3 has a conveying belt 16 for conveying the recording sheet P while sucking it, and a sheet end sensor (not shown). The transport belt 16 is wound around a drive roller 17, a transport roller 18, and a pressure roller 19. Driving force is transmitted to the driving roller 17 from a driving motor 27 to be described later, whereby the transport belt 16 is rotated.

The drive roller 17 and the transport roller 18 are rotatably mounted on the platen 20, and the pressure roller 19 is rotatably mounted on the other end of an arm 21 having one end swingably mounted on the platen 20. Arm 21 is spring 22
The tension is applied to the transport belt 16 by being pressed. The platen 20 is located below the transport belt 16 and has a role of supporting the transport belt 16.

A pinch roller 23 is provided at a position facing the transport roller 18, and is configured to abut on and follow the transport belt 16. The pinch roller 23 is pressed against the transport belt 16 by a spring (not shown),
The recording sheet P is nipped and conveyed to the recording section. Feeding unit 2
An upper guide 14 through which the recording sheet P is guided is provided with a sensor lever 15 for detecting the leading and trailing ends of the recording sheet P and transmitting the detected leading and trailing edges to a sheet end sensor.

Further, a recording head 40 of the recording section 5 for forming an image based on image information is provided downstream of the transport roller 18 in the recording sheet transport direction.

In the above configuration, the lower guide is provided from the feeding section 2.
The recording sheet P guided to the transport unit 3 by being guided by the upper guide 13 and the upper guide 14 is sent to a nip between the transport roller 18 and the pinch roller 23. At this time, the conveyed recording sheet P
The recording position of the recording sheet P is determined by detecting the leading end of the recording sheet P by the sensor lever 15.

(C) Recording Unit The recording unit 5 according to the present embodiment uses a full-line type ink jet recording head 40 in which a plurality of nozzles are arranged in a direction orthogonal to the conveying direction of the recording sheet P.
The recording head 40 is located at 40
K (black), 40C (cyan), 40M (magenta), 40Y
(Yellow) and are attached to the head holder 41 at predetermined intervals. The recording head 40 can apply heat to the ink by a heater or the like.
This heat causes the ink to boil the film, and the pressure change caused by the growth or shrinkage of the bubbles due to the film boiling causes the ink to be ejected from the nozzles of the recording head 40 to form an image on the recording sheet P.

One end of the head holder 41 is rotatably fixed by a shaft 42, and a projection 41 a formed at the other end is engaged with a rail 43. Is defined between the nozzle surface and the recording sheet P (paper interval).

(D) Discharge Unit The discharge unit 4 includes a discharge roller 44 and a spur 45. The recording sheet P on which an image is formed by the recording unit is nipped and conveyed by the discharge roller 44 and the spur 45, and discharged. The sheet is discharged to the tray 46.

Next, the structure, operation, and structure of the suction force generating means for sucking and conveying in the recording section will be described with reference to FIGS. First, the configuration of the suction conveyance will be described with reference to FIGS.

The transport belt 16 is formed 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. The conveyor belt 16 is provided with a suction force generating means 31 described later,
By applying a voltage of about 0.5 KV to 10 KV to the power supply member 34 joined to the transport belt 16, an attractive force is generated on the transport belt 16 in the recording area below the recording head 40.
The power supply member 34 is connected to a high-voltage power supply (not shown) that generates a predetermined high voltage.

As described above, the transport belt 16 is supported by the drive roller 17, the transport roller 18, and the pressure roller 19 under appropriate tension, and the drive roller 17 is connected to the drive motor 27. Further, a sheet pressing roller 25 is rotatably attached to the support member 24 as pressing means for pressing the recording sheet P toward the transport belt. The support member 24 is attached around the rotation axis of the pinch roller 23 as a center of rotation. The support member 24 is urged toward the conveyor belt 16 by urging means (not shown), so that the sheet pressing roller 25 Is pressed against.

As shown in FIG. 3, at a position facing the sheet pressing roller 25, a driven roller that is driven
Reference numeral 26 is rotatably attached to the platen 20, and opposes the pressing force of the sheet pressing roller 25. Thereby, the abrasion and frictional force when the lower surface of the transport belt 16 and the upper surface of the platen 20 are rubbed by pressing the transport belt 16 downward is reduced.

As shown in FIG. 2, a pair of cleaning rollers 28 is provided so as to sandwich the conveyor belt 16. The cleaning roller pair 28 has a small pore diameter (10 μm to 30 μm) for absorbing ink to remove dirt such as ink adhered to the conveyance belt 16 and for preventing deterioration in durability.
m is preferred). After the transport belt 16 is cleaned by the cleaning roller pair 28,
The charge is removed by the charge removing brush 29 serving as the charge removing means.

Next, the suction force generating means 31 will be described with reference to FIGS. 4 is a plan view of the suction force generating means 31 provided on the transport belt 16, FIG. 5 is a cross-sectional view taken along a line aa in FIG.
FIG. 6 is a side view illustrating a power supply member that supplies power to the transport belt.

As shown in FIG. 4, a suction force generating means 31 comprising a set of an electrode plate 32 and an earth plate 33 formed of a conductive metal is provided inside the conveyor belt 16. Each of the electrode plate 32 and the ground plate 33 is formed in an independent comb-teeth shape, and each protrusion faces each other in a direction orthogonal to the conveyance direction of the conveyance belt 16 so that each protrusion enters each recess as shown in the figure. It is installed inside the conveyor belt 16 in the form.

On both sides in the moving direction of the conveyor belt 16, the electrode plate 32 and the earth plate 33 have power supply portions (portions where the pattern is exposed) 32a and 33a, respectively. These feeders
32a and 33a are provided with a distance longer than the width of the electrode plate 32 and the ground plate 33, and the conductive power supply brushes 36 and 37 which come into contact with each other at a predetermined pressure as shown in FIG. doing. A positive or negative voltage is applied from a power supply brush 36 to a power supply portion 32 a of the electrode plate 32 by a high-voltage power supply (not shown), and the power supply brush 37 connected to the power supply portion 33 a of the ground plate 33.
Is dropped to ground.

Further, as shown in FIG.
Protects the attraction force generating means 31 composed of an electrode plate 32 made of a conductive metal and an earth plate 33 by being sandwiched between a base layer 16a and a surface layer 16b. Base layer 16a and surface layer 16b
Is made of a synthetic resin such as polyethylene or polycarbonate.

When a voltage is applied to the electrode plate 32, an electric force is generated in the direction of the arrow, and a line of electric force V as shown in the figure is formed. Then, due to a potential difference between the electrode plate 32 and the ground plate 33, an attraction force is generated at a position above the transport belt 16, and a charge having the same polarity as the voltage applied to the electrode plate 32 is formed on the recording surface of the recording sheet P. (Surface potential) occurs. At this time, the electrode plate
Since not all of the electric force generated at 32 reaches the ground plate 33, the attraction force generated on the electrode plate 32 is stronger than that generated on the ground plate 33.

The recording sheet P conveyed from the feeding unit 2
By reading an encoder provided on the transport belt, which will be described later, using a sheet end sensor that detects the leading edge position and a transport belt position detection sensor (not shown), the transport belt is synchronized by control means (not shown), The sheet is pressed against the conveyor belt 16 by the sheet pressing roller 25 at a position on the electrode plate 32 to which a positive or negative voltage is applied, so that the sheet is reliably attracted to the conveyor belt 16.

Next, the operation of the suction means will be described.
As shown in FIG. 2, the recording sheet P is nipped on the transport belt 16 by the transport roller 18 and the pinch roller 23, is pressed toward the transport belt 16 by the sheet pressing roller 25, and is transported by the suction force generating means 31. The recording medium is adsorbed by the flat surface portion 16c of the recording medium 16 and guided to the recording section.
Conveyed in the direction.

As shown in FIG. 6, the power supply brushes 36 and 37 of the power supply member 34 are supported by a support member 35 and connected to a high-voltage power supply (not shown). Support member 35 and power supply brush 36,
37 has a cover 38 which is a protective member so as to surround the entire circumference.
And a sealing member 39 is provided for protection. Cover 38
The outside is attached to the platen 20, and a sealing member 39 made of a low-hardness elastomer is provided around the entire inner side end to make contact with the conveyor belt 16 at a predetermined pressure. As described above, the power supply member 34 is configured and installed so as to have a predetermined space around and be isolated from the outside by the cover 38 and the sealing member 39.

The cover 38 is made of a material having excellent shielding properties so as to be electrically isolated from the outside.
The sealing member 39 may be made of a porous material capable of absorbing a brush, ink, or the like, and is more preferably made of a material having excellent electrical shielding properties. If the gap between the cover 38 and the conveyor belt 16 is set to a gap amount that does not affect the electric shield, there is no problem even if the sealing member 39 is omitted.

Here, the sealing member 39 of the present embodiment cleans the upper surface of the transport belt 16, particularly the power supply sections 32 a and 33 a, at the most upstream position 39 a in the moving direction of the transport belt 16 (see FIG. 2), and supplies power. This is to improve the bonding between the portions 32a and 33a and the power supply brushes 36 and 37. Further, in the present embodiment, the sealing member 39 is provided on the cover 38 to serve as a cleaning unit for the transport belt 16. However, the cleaning unit may not be provided on the cover 38 but may be provided independently.

As described above, in the suction conveyance according to the present embodiment, the conveyance belt for conveying the recording sheet P is used.
The end of the recording sheet P does not float on the top 16. Therefore, even when recording on the leading and trailing end portions of the recording sheet P, recording can be performed while the ejection nozzle at the end of the recording head 40 is close to the end of the recording sheet P, and a highly accurate recorded image is obtained. be able to.

When a large amount of ink is ejected onto the recording sheet P, the recording sheet P expands and causes waving (cockling). However, also in this case, the recording sheet P is attracted to the conveyance belt 16 side by the attraction force of the attraction force generating means 31 and the pressing force of the sheet pressing roller 25.
The recording sheet P does not rise to the recording head 40 side and does not come into contact with the recording sheet P, and recording can be performed stably.
Further, due to changes in the environment such as temperature and humidity, the recording sheet P
Even when the end of the recording sheet P is wavy or curled, the sheet pressing roller 25 presses the recording sheet P against the transport belt 16 to remove the waving or curl and generate a suction force. , And stable suction can be performed in the recording unit.

Next, the encoder 30 according to the present embodiment will be described with reference to FIG. In FIG. 4, the conveyor belt
Marks 30a, which are the encoders 30, are laid on the surface of the 16 at a predetermined pitch. This pitch is 1/180
, 1/360, etc. The mark 30a is the transport belt 16
Is detected by a sensor (not shown) disposed above
The signal from the sensor is configured to be counted and integrated by detection means (not shown). Then, a predetermined value of a count for stopping the recording sheet P at a predetermined position is set in advance, and when the predetermined value is reached, the driving of the transport belt 16 is stopped.

The mark 30a may be white when the conveyor belt 16 is black, and black when the conveyor belt 16 is white. The material of the mark 30a is not particularly limited as long as it can surely adhere to the surface of the transport belt 16. Further, the mark 30a may be not a paint adhered to the surface of the conveyor belt 16, but may have a three-dimensional shape such as a hole.

In the present embodiment, the power supply portions 32a and 33a of the suction force generating means 31 and the power supply member 34 are provided on the upper surface of the conveyor belt 16, but these are provided on the lower surface (rear surface) of the conveyor belt 16.
The suction force may be generated on the upper surface of the conveyor belt 16 by applying a charge to the suction force generating means 31 from the lower surface. Similarly, the encoder 30 may be provided on the lower surface of the conveyor belt 16 and read on the lower surface.

[Second Embodiment] Next, a second embodiment of the recording apparatus according to the present invention will be described with reference to FIGS. The same parts as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted. FIG. 7 shows a recording device 1
And FIG. 8 is a side view showing a power supply member for supplying power to the transport belt.

In the power supply member 47 according to the present embodiment,
A power supply roller 48 made of a conductive metal is rotatably attached to the support shaft 49. A high-voltage power supply (not shown) is connected to a support shaft 49 formed of a conductive metal like the power supply roller 48, and a positive or negative charge is applied to the power supply roller 48. The power supply roller 48 is connected to the power supply section 32 of the suction force generating means 31.
a, 33 a and is driven and rotated, and the electrode plate 32 and the ground plate
33 is supplied.

In the present embodiment, the contact type using a conductive roller is used to apply electric charge to the attraction force generating means 31. However, a non-contact type made of a thin plate such as SUS having a pointed shape may be used. Good.

[Third Embodiment] Next, the structure and operation of a third embodiment according to the present invention will be described with reference to FIG. The same parts as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted. FIG. 9 is a side view illustrating a power supply member that supplies power to the transport belt.

In the power supply member 50 according to the present embodiment,
The entire circumference of the power supply brush 36 is covered with an insulating brush 51 serving as a protective member having electrical insulation, and both the power supply brush 36 and the insulating brush 51 are attached to the support member 35.

With this configuration, the cover 38 and the sealing member 39 as described in the first embodiment become unnecessary, and a simple structure can be obtained.

[Fourth Embodiment] Next, the structure and operation of a fourth embodiment according to the present invention will be described with reference to FIG.
The same parts as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted. FIG. 10 is an enlarged view of the vicinity of a driven roller of the feeding unit.

As shown in the figure, a resin sheet 52 made of a polyacetal resin having excellent slidability or a resin having a surface coated with fluorine is provided at a position facing the sheet pressing roller 25 of the platen 20. I have. Accordingly, even when the conveying belt 16 is pressed downward by the sheet pressing roller 25, the abrasion and frictional force when the lower surface of the conveying belt 16 and the upper surface of the platen 20 are rubbed can be reduced.

In this embodiment, the resin sheet 52
Is provided only at a position facing the sheet pressing roller 25 of the platen 20, but if it is provided on the entire upper surface of the platen 20, wear and friction can be further reduced.

[0062]

As described above, in the recording apparatus according to the present invention, the suction force is not applied to the conveyance belt and the platen because the suction force generation means is integrally provided inside the conveyance belt. Accordingly, the frictional resistance between them does not increase, and the torque for driving the transport belt may be small. For this reason, an apparatus with low power consumption and low cost can be provided.

Further, since the power is supplied to the suction force generating means only in the vicinity of the recording area immediately below the recording head to generate the suction force, the recording sheet has the suction force at the most downstream end of the conveying belt. Is not added. Therefore, it can be easily and reliably separated and discharged from the conveyor belt.

Further, since the attraction force can be generated only in the recording area, an efficient device with less energy loss can be provided. Further, since the operation time of the attraction force generating means can be reduced, deterioration of the surface layer and the base layer near the electrodes protecting the electrodes can be reduced, and the durability of the attraction force generation means can be improved. it can.

Further, by providing a friction reducing member at a position opposing the sheet pressing roller with the conveying belt interposed therebetween, it is possible to reduce wear and frictional force when the lower surface of the conveying belt rubs against the upper surface of the platen. The durability of the device can be improved.

In addition, since the leading end of the recording sheet is pressed against the conveyance belt at a position on the electrode plate to which a positive or negative voltage is applied by the pressing means, the recording sheet can be reliably attracted to the conveyance belt. .

Further, a cleaning means for cleaning the transport belt is provided between the driving roller and the pressure roller, and a discharge means for discharging the transport belt downstream thereof is provided. The transfer belt can be reliably and stably discharged without being contaminated with powder or the like.

Further, since the power supply means for applying a voltage to the attraction force generating means is separated from the outside by a protective member, the power supply means can stably apply the voltage without being affected by paper dust, ink mist, or the like. Can be supplied.

Further, when the protective member is formed of an insulating brush, a cover and a sealing member can be dispensed with, so that the device can be simplified and the production cost can be reduced.

Further, by providing a cleaning member for cleaning the power supply unit of the suction force generating means at the most upstream position in the moving direction of the conveyor belt, the power supply unit can be supplied without being affected by dirt such as dust, paper dust, and ink. Can be joined with the means. Therefore, power can be supplied stably and a highly reliable device can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of an image recording apparatus according to a first embodiment.

FIG. 2 is a configuration sectional view of a feeding unit of the image recording apparatus.

FIG. 3 is an enlarged view of the vicinity of a driven roller of a feeding unit.

FIG. 4 is a plan view of an attraction force generating unit provided on the transport belt.

FIG. 5 is a sectional view taken along line aa of FIG. 4;

FIG. 6 is a side view illustrating a power supply member that supplies power to the transport belt.

FIG. 7 is a side view illustrating a configuration of a transport unit 3 of the recording apparatus 1 according to the second embodiment.

FIG. 8 is a side view illustrating a power supply member that supplies power to the transport belt.

FIG. 9 is a side view illustrating a power supply member that supplies power to a transport belt according to a third embodiment.

FIG. 10 is an enlarged view of the vicinity of a driven roller of a feeding unit according to a fourth embodiment.

FIG. 11 is an overall configuration diagram of a conventional inkjet recording apparatus.

FIG. 12 is a partially enlarged view of a conventional ink jet recording apparatus viewed from above.

FIG. 13 is an enlarged view of a main part of a conventional ink jet recording apparatus.

[Explanation of symbols]

 P: Recording sheet V: Electric force line 1: Recording device 2: Feeding unit 3: Conveying unit 4: Ejecting unit 5: Recording unit 6: Base 7: Pressure plate 7a: Separation pad 7b: Rotating shaft 8: Pressure plate spring 9: Separating claw 10 ... Feeding roller 11 ... Tray 12 ... Feeding roller 13 ... Lower guide 14 ... Upper guide 15 ... Sensor lever 16 ... Transport belt 16a ... Base layer 16b ... Surface layer 16c ... Flat surface part 17 ... Drive roller 18 ... Transport Roller 19… Pressure roller 20… Platen 21… Arm 22… Spring 23… Pinch roller 24… Support member 25… Sheet pressing roller 26… Driving roller 27… Drive motor 28… Cleaning roller pair 29… Electrostatic brush 30… Encoder 30a… Mark 31 ... attracting force generating means 32 ... electrode plate 32a ... terminal 33 ... ground plate 33a ... terminal 34 ... power supply member 35 ... support members 36 and 37 ... power supply brush 38 ... cover 39 ... sealing member 39a ... most upstream Position 40: Recording head 41: Head holder 41a: Projecting part 42: Shaft 43: Rail 44: Discharge roller 45: Spur 46: Discharge tray 47: Power supply member 48: Power supply roller 49: Support shaft 50: Power supply member 51: Insulating brush 52… Resin sheet

Claims (9)

[Claims] 1. A recording head for recording an image on a recording medium, a transport belt for transporting the recording medium, and a comb-shaped electrode formed integrally with the transport belt and having independent teeth. An attraction force generating means arranged together; a power supply means for supplying power to power supply portions of the electrodes provided on both sides in the moving direction of the conveyor belt; and an at least one adsorbable area generated by the attraction force generation means. Pressing means for pressing the recording medium against the transport belt at an upstream position, wherein the power supply means is configured to supply power to the attraction force generating means only in the vicinity of a recording area of the recording head. Image recording device. 2. The power supply device according to claim 1, wherein a protection member is provided around the power supply unit so as to be in contact with the conveyance belt or to be provided with a small gap, and the power supply unit and the outside are separated from each other. Image recording device. 3. An upstream most upstream position of the conveyor belt,
3. The image recording apparatus according to claim 1, further comprising a cleaning unit configured to clean a power supply unit of the attraction force generating unit. 4. The apparatus according to claim 1, wherein said pressing means presses a leading end of said recording medium at a position on a positive or negative electrode of said attraction force generating means. An image recording device according to the above item. 5. The image recording apparatus according to claim 1, wherein a friction reducing unit is provided at a position facing the pressing unit with respect to the transport belt. 6. A cleaning device for cleaning the transport belt provided downstream of a recording area of the transport belt, and a static eliminator for removing the charge of the transport belt further downstream of the cleaning device is provided. The image recording apparatus according to any one of claims 1 to 5, wherein 7. The recording head according to claim 1, wherein the recording head is a full line type recording head in which a plurality of recording elements are arranged over the entire width of a recording area of the recording medium. Item 2. The image recording device according to item 1. 8. The image recording apparatus according to claim 1, wherein a plurality of the recording heads are arranged in a moving direction of the conveyor belt. 9. The recording head is an ink jet recording head that performs recording by discharging ink using thermal energy, and includes an electrothermal energy converter for generating thermal energy applied to the ink. The image recording apparatus according to any one of claims 1 to 8, wherein: