JP4198876B2 - Inkjet recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording apparatus, and more specifically, an ink jet recording apparatus for obtaining a desired ink image by ejecting ink droplets from a recording head onto recording paper by an ink jet recording system (liquid jet recording system). It is about.
[0002]
[Prior art]
As this type of ink jet recording apparatus, there are a recording head provided in a recording area, a paper feed side conveying roller provided upstream of the recording head for supplying recording paper before recording to the recording area, and a recording A discharge-side transport roller provided on the downstream side of the head for discharging the recording paper after recording from the recording area; and a drive motor for driving these rollers. There is known one in which the conveyance speed is set to be larger than the conveyance speed of the sheet-feed-side conveyance roller.
[0003]
In such an ink jet recording apparatus, when the recording paper passes through the paper feed-side transport roller and is transported only by the paper discharge-side transport roller, the increase in the transport amount of the paper discharge-side transport roller is corrected. It was necessary to take measures to correct the drive pulse signal of the drive motor.
[0004]
[Problems to be solved by the invention]
However, in such an ink jet recording apparatus, the increase in the conveyance amount may not coincide with the conveyance amount obtained by performing the pulse correction of the drive motor, and the maximum drive pulse signal (resolution) of the drive motor. ) Of the transport amount by half.
[0005]
In other words, since the paper feed-side transport roller and the paper discharge-side transport roller are separate members, due to variations in their dimensional accuracy, a transport amount deviation occurs even if the transport amount is corrected with a pulse. There is a drawback that image quality deteriorates such as white stripes and white stripes.
[0006]
SUMMARY An advantage of some aspects of the invention is that it provides an ink jet recording apparatus that can prevent deterioration in image quality due to a deviation in the conveyance amount of recording paper.
[0007]
[Means for Solving the Problems]
According to the present invention, a recording head provided in a recording area, a paper-feed-side conveying means provided on the upstream side of the recording head for conveying recording paper before recording to the recording area, and recording A platen plate that is provided to face the recording head in the area for placing recording paper at the time of recording, and is provided on the downstream side of the recording head for conveying the recording paper after recording to be discharged from the recording area A paper-feed-side transport means, and a drive means for driving these two transport means at the same speed. The paper discharge side transport means includes a paper discharge side transport roller and a paper discharge side driven roller driven by the roller, and the paper feed side transport means and the paper discharge side transport means further include Paper feed side transport roller and paper discharge side transport row And a conveying belt that conveys the recording paper sandwiched between the two driven rollers, and a driving means is attached to a driving motor, a rotation shaft of the driving motor, and a feeding-side conveying roller and A drive that rotates and drives the other conveying roller at the same speed as the one conveying roller through the conveying belt by engaging with one of the discharging rollers and rotating the conveying roller. A plurality of conveying belts provided in a direction orthogonal to the conveying direction of the recording paper, and a tension roller disposed between the paper feeding side conveying means and the paper discharging side conveying means. The whole area in the recording area is tensioned in a direction away from the recording paper and the platen plate, so that the recording paper in the recording area is placed on the platen plate. And be carried by the state, the paper feed side transport roller and the paper discharge side transport roller, a flange portion for preventing the shift Hari hooking position of the conveying belt is provided only set corresponding to the number of the conveyor belt In addition, there is provided an ink jet recording apparatus characterized in that an interval between a pair of flange portions is set to be substantially equal to the width of the conveying belt .
[0008]
The recording head performs recording by selectively ejecting ink from a plurality of nozzles. This ink is supplied from, for example, an ink tank disposed above the recording head. The sheet feeding side conveying means is for conveying the recording sheet before recording to the recording area, and includes a sheet feeding side conveying roller and a sheet feeding side driven roller driven by the roller. . The paper discharge side transport means is for transporting the recording paper after recording to be discharged from the recording area, and includes a paper discharge side transport roller and a paper discharge side driven roller driven by the roller. . The driving means is for driving the paper feeding side conveying means and the paper discharging side conveying means, and drives these two conveying means at the same speed.
[0009]
Here, in order to drive these two conveying means at the same speed by the driving means, for example, one of the conveying means is rotationally driven by a driving motor, and the rotational force of the conveying means is not increased or decreased. What is necessary is just to comprise so that it may transmit to the other conveyance means.
[0010]
According to the ink jet recording apparatus configured in this way, the transport amount of the recording paper by the paper feed side transport means is equal to the transport amount of the recording paper by the paper discharge side transport means. Therefore, it is possible to prevent image quality from being deteriorated due to a deviation in the transport amount of the recording paper.
[0011]
Further, the recording paper is reliably conveyed by the same conveyance amount on the paper supply side and the paper discharge side by the one conveyance belt as described above and the driving means as described above, which is advantageous in terms of cost. In addition, it is possible to reliably prevent deterioration of image quality. Further, since the recording paper in the recording area is placed on the platen plate and conveyed while being in close contact with the platen plate, the occurrence of printing unevenness is suppressed and stable printing can be performed.
In addition, since a plurality of conveyance belts are provided in a direction orthogonal to the conveyance direction of the recording paper, it is possible to suppress positional deviation when the conveyance belt is stretched on the conveyance roller. In addition, since the flange portion for preventing the conveying belt tensioning position from being shifted on the sheet feeding side conveying roller and the sheet discharging side conveying roller is provided in a set corresponding to the number of conveying belts, It is possible to prevent the position where the conveying belt is stretched on the roller from shifting.
[0012]
That is, the paper feed side transport means includes a paper feed side transport roller, a paper feed side driven roller, and a transport belt, and the paper discharge side transport means includes the paper discharge side transport roller, the paper discharge side driven roller, and the transport. And a belt. This conveyor belt is a member common to the sheet feeding side conveying means and the sheet discharging side conveying means, and is stretched between the two driven rollers and stretched between the sheet feeding side conveying roller and the sheet discharging side conveying roller. Convey the recording paper. The conveyance belt may be a single sheet having a relatively wide width, but is preferably composed of a plurality of relatively narrow sheets as will be described later. The drive means includes a drive motor and a drive member. Here, the drive member is attached to the rotation shaft of the drive motor and engages with one of the feed roller and the discharge roller. Then, by rotating the one conveying roller, the other conveying roller is rotated at the same speed as the one conveying roller via the conveying belt. As such a drive member, for example, a drive gear or a drive pulley is preferably used.
[0013]
According to the ink jet recording apparatus configured as described above, one conveying belt (a member common to the sheet feeding side conveying unit and the sheet discharging side conveying unit, the sheet feeding side conveying roller and the sheet discharging side conveying roller). tension and hung with members for conveying sandwiching the recording sheet between said two driven rollers), drive means (a drive motor, mounted on the rotary shaft of the driving motor and the paper feed side transport roller and the discharge to A driving member that engages with one of the side conveyance rollers and rotationally drives the conveyance roller to rotate the other conveyance roller at the same speed as the one conveyance roller via the conveyance belt; by what will become) comprise, results in the recording paper is reliably transported by the same carrier amount in the paper feeding side and the paper discharge side, after a cost-effective, reliably prevent degradation of image quality To do Kill.
[0014]
In the ink jet recording apparatus according to the present invention, it is preferable that a plurality of transport belts are provided in a direction perpendicular to the transport direction of the recording paper.
[0015]
Here, the direction orthogonal to the conveyance direction of the recording paper, in other words, the movement direction of the recording head. More preferably, the plurality of conveyor belts are made of the same material and have the same dimensions.
[0016]
According to the ink jet recording apparatus configured as described above, by constituting the plurality of conveyor belts, it is possible to suppress positional deviation when the conveyor belt is stretched on the conveyor rollers.
[0017]
In the ink jet recording apparatus according to the present invention, it is preferable that the paper feed side transport roller and the paper discharge side transport roller are provided with a flange portion for preventing the position where the transport belt is stretched.
[0018]
It is preferable to provide only a set of flange portions corresponding to the number of conveying belts. Further, it is preferable that the distance between the pair of flange portions is set to be substantially equal to the width of the conveyor belt.
[0019]
According to the ink jet recording apparatus configured as described above, it is possible to prevent the flange belt portion from shifting the position where the conveying belt is stretched between the two conveying rollers.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, two embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to these.
[0021]
Embodiment 1
1 and 2, an ink jet printer P ₁ as an ink jet recording apparatus according to Embodiment 1 of the present invention includes a paper feed tray 2 for storing a recording paper 1 before recording, and a downstream side of the paper feed tray 2. A paper discharge tray 3 for storing the recording paper 1 after recording, and a recording paper conveyance path 4 provided between the paper feed tray 2 and the paper discharge tray 3 so as to be connected to them. A paper feed side transport roller 5 provided between the paper feed tray 2 and the recording paper transport path 4, a paper feed side driven roller 6 driven by the transport roller 5, and a downstream side of the recording paper transport path 4. PS roller 7, PS driven roller 8 driven by PS roller 7, PS roller 7 and platen plate 9 provided on the downstream side of PS driven roller 8, and recording head (ink head) provided above platen plate 9 Printing as Ink carriage 10 de is attached, a discharge-side conveying rollers 11 and provided between the platen 9 and the paper discharge tray 3, provided with a paper discharge side driven roller 12 which is driven in the conveying roller 11.
[0022]
A pickup roller 13 is provided between the paper feed tray 2 and the paper feed side driven roller 6. Further, the ink carriage 10 is held by a pair of holding shafts 14 so that the scanning is performed smoothly. The ink carriage 10 to which the print head is attached and the pair of holding shafts 14 constitute a print unit 15 as a recording area.
[0023]
As shown in FIG. 2, when a print request based on the image information from such a computer not shown (recording request) is issued to the inkjet printer P _1, one sheet of the recording paper 1 at the top of the paper feed tray 2, The paper is picked up by the pick-up roller 13 and sent to the paper-feed-side transport roller 5.
[0024]
The recording paper 1 is conveyed downstream by the conveying roller 5 and the driven roller 6 and passes through the recording paper conveying path 4, and the leading edge of the image information and the leading edge of the recording paper 1 are adjusted based on the image information. The PS roller 7 reaches the printing unit 15.
[0025]
In the printing unit 15, ink is ejected from a necessary recording head corresponding to the image information, and is recorded on the recording paper 1. At this time, the recording paper 1 is temporarily stopped, and when the scanning of one line (one direction) of the ink carriage 10 is completed, the recording paper 1 corresponding to a plurality of ink nozzles of the recording head is conveyed.
[0026]
In this way, the printing unit 15 continuously performs the processing corresponding to the image information, whereby the image information by ink is written on the recording paper 1. The recorded recording paper 1 is discharged to the paper discharge tray 3 through the paper discharge side transport roller 11 and the paper discharge side driven roller 12, and is provided to the user as a printed matter.
[0027]
Next, the control circuit of the inkjet printer P ₁ will be described with reference to FIG.
[0028]
The CPU mounted on the substrate is connected to the host computer via an interface (I / F). The CPU receives print data from the host computer via the interface according to the program written in the ROM, and controls the recording operation while using the RAM.
[0029]
The user recognizes the state of the ink jet printer P ₁ or the like by using the operation panel 16 (see FIG. 1) as an operation unit, or inputs a recording format by using the operation panel 16. There are a method for notifying the user of the state of the ink jet printer P _{1 and} the like, and a method for allowing the user to input a recording format such as a method for notifying the host computer via an interface.
[0030]
The recording head (head) is connected to a head driver and performs printing. Each motor is controlled by a CPU via a motor driver. The sensor is connected to the CPU. P. The position of the recording paper 1 in the recording paper conveyance path 4 is detected.
[0031]
Next, with reference to FIGS. 4 and 5, it will be described more detailed configuration of the inkjet printer P _1.
[0032]
In other words, the ink jet printer P ₁ further includes a plurality of papers that are stretched over the paper feed side transport roller 5 and the paper discharge side transport roller 11 and sandwich the recording paper 1 between the two driven rollers 6 and 12. A conveyance belt 20 is provided. A plurality of these conveying belts 20 are provided in a direction orthogonal to the conveying direction of the recording paper 1. The conveyor belts 20 are made of the same material and have the same dimensions, and the entire intermediate portion is recorded by the two tension rollers 21 and 22 disposed in the intermediate portions of the two conveyor rollers 5 and 11. Tension is applied in a direction away from the paper 1 and the platen plate 9. The intermediate portion of the recording paper 1 is placed on the platen plate 9.
[0033]
In addition, as shown in FIG. 5, the two conveying rollers 5 and 11 are provided with a plurality of flange portions 23 for preventing the tensioning positions of the plurality of conveying belts 20 from shifting. These flange portions 23 are provided in a number corresponding to the number of the conveyor belts 20, and the interval between the pair of flange portions 23 is set to be substantially equal to the width of each conveyor belt 20. Yes.
[0034]
The ink jet printer P ₁ is further provided with driving means 24 for driving the two transport rollers 5 and 11 at the same speed. The drive unit 24 includes a drive motor 25 disposed in the vicinity of one end side of the paper feed-side transport roller 5, a drive gear 26 as a drive member attached to the rotation shaft of the drive motor 25, and the transport roller 5. A driven gear 28 that is attached to the rotating shaft 27 of the conveying roller 5 on one end side and meshes with the driving gear 26 is provided.
[0035]
In such a configuration, when the drive motor 25 rotates, the drive gear 26 and the driven gear 28 rotate to rotate the paper feed-side transport roller 5, so that the rotational force is conveyed via the transport belt 20 to the paper discharge-side transport. It is transmitted to the roller 11, and the paper discharge side transport roller 11 is rotationally driven at the same speed as the paper feed side transport roller 5.
[0036]
Since the inkjet printer P ₁ is configured as described above, the following effects can be obtained. That is, since the transport amount of the recording paper 1 by the paper feed side transport roller 5 and the transport amount of the recording paper 1 by the paper discharge side transport roller 11 are equal, it is caused by the shift of the transport amount of the recording paper as in the conventional inkjet recording apparatus. Degradation of image quality can be prevented.
[0037]
Further, the recording paper 1 is reliably conveyed with the same conveyance amount on the paper supply side and the paper discharge side by the single conveyance belt 20 and the driving unit 24, which is advantageous in terms of cost and image quality. Can be reliably prevented.
[0038]
Furthermore, since the conveyor belt 20 is composed of a plurality of belts, it is possible to suppress positional deviation of the conveyor belt 20 when the conveyor belt 20 is stretched over the two conveyor rollers 5 and 11.
[0039]
In addition, it is possible to prevent the flange belt 23 of the transport rollers 5 and 11 from shifting the position where the transport belt 20 is stretched on the two transport rollers 5 and 11.
[0040]
Embodiment 2
In FIG. 6, an ink jet printer P ₂ as an ink jet recording apparatus according to the second embodiment of the present invention is stretched over a paper feed side transport roller 5 and a paper discharge side transport roller 11 and includes two driven rollers 6 and 12. A plurality of conveying belts 30 are provided to convey the recording paper 1 between them. A plurality of these transport belts 30 are provided in a direction orthogonal to the transport direction of the recording paper 1. These conveyor belts 30 are made of the same material and have the same dimensions, and a part of the conveyor belt 30 is formed from the recording paper 1 by one tension roller 22 disposed in the middle of the two conveyor rollers 5 and 11. Tension is applied in the direction of moving away.
[0041]
The ink jet printer P ₂ does not have the platen plate 9 as in the case of the ink jet printer P ₁ , and the recording paper 1 is in contact with the conveying belt 30 even in the middle portion thereof, unlike the case of the ink jet printer P ₁ . .
[0042]
Since the configuration of the other parts of the ink jet printer P ₂ and the effects thereof are substantially the same as the configuration of the ink jet printer P ₁ and the effects thereof, detailed description thereof will be omitted. A unique effect of the ink jet printer P ₂ is that a platen plate is not required.
[0043]
【The invention's effect】
In the ink jet recording apparatus according to the first aspect of the present invention, the recording head provided in the recording area and the recording paper provided upstream of the recording head are conveyed so as to supply the recording paper before recording to the recording area. A sheet feeding side conveying means, a platen plate provided so as to face the recording head in the recording area, and a recording sheet for recording, and a recording sheet after recording provided on the downstream side of the recording head. A sheet discharge side conveying means for conveying the sheet to be discharged from the recording area, and a driving means for driving the two conveying means at the same speed, and the sheet feeding side conveying means includes a sheet feeding side conveying roller, A paper-feed-side driven roller driven by the roller, and a paper-feed-side transport means includes a paper-discharge-side transport roller and a paper-discharge-side driven roller driven by the roller. Means and the delivery side transport means And a conveying belt that is stretched around the paper feeding side conveying roller and the paper discharging side conveying roller and sandwiches the recording paper between the two driven rollers, and the driving means includes a driving motor and the driving motor. The other transport roller via the transport belt by being engaged with one of the paper feed side transport roller and the paper discharge side transport roller and rotationally driving the transport roller. And a driving member that rotates at the same speed as one of the conveying rollers, and a plurality of the conveying belts are provided in a direction orthogonal to the conveying direction of the recording paper. A tension roller disposed between the conveying means and the entire area in the recording area is tensioned away from the recording paper and the platen plate. And the recording paper is conveyed in a state placed on the platen in, the paper feed side transport roller and the paper discharge side transport roller, the flange portion the conveyor belt to prevent the shift Hari hooking position of the conveying belt Only a set corresponding to this number is provided, and the interval between the set of flange portions is set to be substantially equal to the width of the conveyor belt .
[0044]
Therefore , in the ink jet recording apparatus according to the first aspect of the present invention, since the transport amount of the recording paper by the paper feed side transport means and the transport amount of the recording paper by the paper discharge side transport means are equal, It is possible to prevent the deterioration of image quality due to the deviation of the conveyance amount of the recording paper as in the recording apparatus. One conveyor belt (a member common to the sheet feeding side conveying unit and the sheet discharging side conveying unit, which is stretched between the sheet feeding side conveying roller and the sheet discharging side conveying roller and is connected to the two driven rollers. A member that conveys the recording paper in between, and a driving means (a driving motor and one of the feeding-side conveying roller and the discharging-side conveying roller that are attached to a rotation shaft of the driving motor and the feeding motor) And a drive member that rotationally drives the transport roller through the transport belt by engaging and driving the other transport roller at the same speed as the one transport roller). The paper is reliably transported by the same transport amount on the paper feed side and the paper discharge side, which is advantageous in terms of cost and can reliably prevent deterioration in image quality. Further, the entire tension in the recording area is applied to the conveying belt in a direction away from the recording paper and the platen plate by a tension roller disposed between the feeding side conveying unit and the discharging side conveying unit. Because the recording paper in the recording area is placed on the platen plate and conveyed in close contact with the platen plate, printing unevenness due to the movement of the conveying belt in the recording area when there is no platen plate, etc. Is suppressed, and stable printing can be performed.
In addition, since a plurality of conveyance belts are provided in a direction orthogonal to the conveyance direction of the recording paper, it is possible to suppress positional deviation when the conveyance belt is stretched on the conveyance roller. In addition, since the flange portion for preventing the conveying belt tensioning position from being shifted on the sheet feeding side conveying roller and the sheet discharging side conveying roller is provided in a set corresponding to the number of conveying belts, It is possible to prevent the position where the conveying belt is stretched on the roller from shifting.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an ink jet printer as an ink jet recording apparatus according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of an internal configuration of the ink jet printer according to FIG. 1;
FIG. 3 is a block diagram of a control circuit of the ink jet printer according to FIG. 1;
4 is an explanatory diagram illustrating an enlarged configuration of a main part of the ink jet printer according to FIG. 1. FIG.
FIG. 5 is an explanatory diagram of an enlarged configuration of a main part of the ink jet printer according to FIG. 1;
FIG. 6 is an explanatory diagram illustrating an enlarged configuration of a main part of an ink jet printer as an ink jet recording apparatus according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Recording paper 2 Paper feed tray 3 Paper discharge tray 4 Recording paper conveyance path 5 Paper supply side conveyance roller 6 Paper supply side driven roller 10 Ink carriage 11 Paper discharge side conveyance roller 12 Paper discharge side driven roller 15 Printing part 20 Conveying belt 23 Flange part 24 Drive means 25 Drive motor 26 Drive gear

Claims (1)

A recording head provided in the recording area, a paper feed side conveying means provided on the upstream side of the recording head for conveying the recording paper before recording to the recording area, and facing the recording head in the recording area A platen plate for placing the recording paper at the time of recording, and a paper discharge side conveying means for conveying the recording paper after recording to be discharged from the recording area provided on the downstream side of the recording head; Driving means for driving these two conveying means at the same speed,
The paper-feed-side transport means includes a paper-feed-side transport roller and a paper-feed-side driven roller that is driven by the roller, and the paper-discharge-side transport means is a paper-discharge-side transport roller and a discharge that is driven by the roller. A paper-side driven roller, and a paper-feed-side transport unit and a paper-discharge-side transport unit are further stretched over the paper-feed-side transport roller and the paper-discharge-side transport roller to perform recording between the two driven rollers. A conveying belt that conveys the paper, and a driving unit is attached to a driving motor and one of the feeding-side conveying roller and the discharging-side conveying roller that is attached to a rotation shaft of the driving motor. And a drive member that rotationally drives the other transport roller at the same speed as the one transport roller via the transport belt by rotationally driving the transport roller,
A plurality of the transport belts are provided in a direction orthogonal to the transport direction of the recording paper, and a portion in the recording area is provided by a tension roller disposed between the paper feed side transport unit and the paper discharge side transport unit. Is tensioned in a direction away from the recording paper and the platen plate, whereby the recording paper in the recording area is conveyed while being placed on the platen plate ,
The paper feed side transport roller and the paper discharge side transport roller are provided with only a set of flanges corresponding to the number of transport belts for preventing the belt belt from shifting its position. An ink jet recording apparatus, characterized in that an interval is set so as to be substantially equal to a width of a conveying belt .

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