CN101066648A - Fixture conveying device and liquid fixing device - Google Patents

Abstract

The invention relates to a fixed material transportation apparatus and liquid fixing apparatus, the fixed material transportation apparatus transports a fixed material to prevent rippled. In the fixed material transportation apparatus, the upside delivery surface of fixed material attracts feeding fixed material, the region between the fixing region to fixe fixed material and downstream side region from a fixing region to a transportation direction is a ladder-type in the delivery surface of fixed material. Accordingly, the extended rippled along direction of transfer is occurred after recording medium, but when the recording medium in the recording medium delivery surface is uplifted and transported along direction of transfer, so to prevent the extension of rippled.

Description

Fixture conveying device and liquid fixing device

technology area

The invention relates to a fixed object conveying device for conveying the fixed object and a liquid fixing device provided with the fixed object conveying device.

Background technique

Conventionally, in a liquid fixing device such as an inkjet printer, there is a mechanism that continuously feeds printing paper to the recording unit via a printing paper feeding device as a fixed member, records it, and sends it out to the outside. Fig. 9(a) is only a schematic diagram of the main part of the printing paper delivery device for such an ink jet printer. For related inkjet printers, use the paper feed roller 2 and its driven roller 2a to clamp and continuously convey the printing paper 1, record with the recording head 3, and then use the paper discharge roller 4 and its toothed roller as the driven roller. The rollers 4a nip, convey and discharge.

In the above-mentioned conventional inkjet printer with a printing paper conveying device, when, for example, recording an image that ejects many ink droplets like an overly dense image on the printing paper 1, as shown in FIG. 9( b), The printing paper 1 absorbs a large amount of ink, expands toward the recording head 3 after recording, and forms waves, which may cause so-called waviness. Then, after the generated waviness develops, the interval between the printing paper 1 and the recording head 3 becomes uneven, recording mottling occurs due to the dispersion of ink droplet spreading distance, or the printing paper 1 touches the recording head 3, and there is confusion. pollution problem.

With regard to these problems, if the distance between the paper conveying roller 2 and the paper discharge roller 4 is small, suppression within the allowable range can also prevent the occurrence of the above-mentioned waviness as much as possible. However, for ink-jet printers, etc., in the near future, in order to further increase the recording speed, the number of nozzles of each color nozzle in each row is increased, or it is necessary to arrange nozzles of many colors in the conveying direction of the printing paper 1, in this case Next, the size of the recording head 3 will extend in the conveying direction of the printing paper 1 as shown in FIG. 9(c).

Then, if the recording head 3 is extended, the interval between the paper conveying roller 2 and the discharge roller 4 will also be extended, so when the paper conveying roller 2 and its driven roller 2a and the paper discharge roller 4 and its function as a driven roller In the structure in which the toothed rollers 4a nip, convey, and discharge, the waviness cannot be completely prevented. Furthermore, the waviness exceeds the allowable range, and it cannot be considered that the structure itself is nipped by two sets of rollers, conveyed, and discharged by such a large inkjet printer with a long print head.

In addition, such waviness is relatively small when special printing paper for an inkjet printer is used as printing paper 1 , and becomes large when plain paper is used. For this reason, under normal circumstances, in the design of inkjet printers, etc., considering the paper floating problem caused by the corrugation when using plain paper, the paper interval is enlarged (printing paper 1 and 1 in Fig. 9 (a) Space A) between recording heads 3. However, when the paper gap becomes larger, when using special printing paper that does not need to expand the gap, the ink particles ejected from the nozzles of the recording head 3 will spread in a curved line, and only the impact point will be shifted, which will not hinder the improvement of recording quality. .

On the other hand, in recent years, the main proposal has a hollow box-shaped suction part on the printing paper conveying surface, and a suction pump or the like is used to suck the printing paper through a plurality of through suction holes provided on the suction part (refer to JP-A-63-303781, JP-3-270, etc.). Among them, as a mechanism for solving the above-mentioned waviness, there is also a proposal of sucking and sucking the printing paper to the platform or the like through the suction holes.

However, it is difficult to completely prevent wrinkling of the printing paper in the recording section regardless of the hollow box-shaped suction section having a through-hole for suction. Furthermore, in the conventional example described in the above-mentioned gazette, since the hollow box-shaped suction part is only provided with a through-hole and suctioned, if the suction force is too strong, the paper conveying accuracy will be reduced. For this reason, the current reality is that, except for a part of large-scale printing such as paper feeding in the direction of gravity (feeding paper by the weight of the printing paper), it has not been put into practical use.

Contents of the invention

In view of the above-mentioned various problems, an object of the present invention is to provide a fixed material delivery device capable of effectively preventing the development of wrinkles when the fixed material is transported, and a liquid fixation device provided with the fixed material delivery device.

In order to achieve the above object, the fixed object conveying device according to the first aspect of the present invention is a fixed object conveying device that conveys the supplied fixed object while sucking on the fixed object conveying surface, and is characterized in that the fixed object conveying surface , formed in an inclined shape that is higher from the downstream side in the conveying direction of the above-mentioned to-be-fixed material than toward the upstream side. Thus, even if corrugations extending along the conveying direction of the fixed object occur, the corrugations will be displaced when the fixed object is lifted in the conveying direction on the conveying surface of the fixed object, so that the corrugation can be prevented. Wrinkles develop.

The invention of the second aspect of the present invention is the fixed material conveying device according to the first aspect of the present invention, wherein the inclined surface is curved in a concave shape. Thereby, since the front-end|tip of the to-be-fixed material advances along the concavely curved to-be-fixed material conveyance surface, the to-be-fixed material can be conveyed smoothly without hindrance.

In order to achieve the above object, the fixed object conveying device according to the third aspect of the present invention is a fixed object conveying device that conveys the supplied fixed object while sucking on the fixed object conveying surface, and is characterized in that the fixed object conveying surface It is formed in an inclined shape in which the downstream side in the conveyance direction of the said to-be-fixed material is lower than the upstream side. Thus, even if corrugations extending along the conveying direction of the fixed object occur, the corrugations are displaced when the fixed object is conveyed while being sagged by its own weight along the conveying direction on the conveying surface of the fixed object. , so it is possible to prevent wrinkle development.

The invention according to the fourth aspect of the present invention is the fixed material conveying device according to the third aspect of the present invention, wherein the inclined surface is curved convexly. Thereby, since the front end of the to-be-fixed material advances along the convexly curved to-be-fixed material conveyance surface, the to-be-fixed material can be conveyed smoothly without hindrance.

The invention according to claim 5 is the fixed material conveying device according to claim 1 or 3, wherein the inclined surface is formed in a straight shape. As a result, when the fixed member enters the inclined surface, since it is bent at a predetermined angle, the force for moving the corrugations can be exerted intensively and intensively.

The invention of the sixth aspect of the present invention is the fixed object conveying device according to any one of the first to fifth aspects of the present invention, wherein the recording area for recording the fixed object on the fixed object conveyance surface is characterized in that formed horizontally. Accordingly, since the distance between the fixed member and the recording head can be made uniform, the recording accuracy can be maintained with high accuracy.

In order to achieve the above object, the fixed object conveying device according to the seventh aspect of the present invention is a fixed object conveying device that conveys the supplied fixed object while sucking on the fixed object conveying surface, and is characterized in that the fixed object conveying surface , a step is formed between the recording area where recording is performed on the above-mentioned fixed member and the area downstream from the recording area in the conveyance direction.

The eighth invention of the present invention is the fixed material conveying device according to the seventh invention, wherein the step is formed such that the recording area is higher than the downstream area. Thus, even if corrugations extending along the conveying direction of the fixed object occur, the corrugations are shifted when the fixed object is conveyed while sagging in the conveying direction on the conveying surface of the fixed object, so Able to prevent wrinkle development.

The invention according to the ninth aspect of the present invention is the fixed material conveyance device according to the seventh or eighth aspect of the present invention, wherein the recording area and the downstream side area are formed in a straight shape. Accordingly, since the distance between the fixed member and the recording head can be made uniform, the recording accuracy can be maintained with high accuracy. In addition, the to-be-fixed material can be conveyed while maintaining a substantially straight state in which waviness is prevented from developing.

The tenth aspect of the present invention is the fixed object conveying device according to any one of the present inventions 1 to 9, characterized in that it has a plurality of suction holes provided on the fixed object conveying surface and A decompression chamber communicating with the above-mentioned plurality of suction holes and a suction mechanism for sucking air in the above-mentioned decompression chamber; the above-mentioned suction hole has an area including a suction hole communicating with the above-mentioned decompression chamber and a suction surface facing the fixed member. A suction member of a suction chamber having a larger cross-sectional area than the above-mentioned suction hole. Accordingly, since an appropriate suction force can be generated, the conveyance accuracy of the fixed material can be maintained and conveyed with high precision.

In order to achieve the above object, the liquid immobilization device according to claim 11 of the present invention is characterized in that it includes the fixed member transport device according to any one of claims 1 to 10 of the present invention. Accordingly, it is possible to provide a liquid immobilization device that achieves the above-described various functions.

Description of drawings

Fig. 1 is a side view showing a recording medium conveying device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a recording medium conveying surface of the recording medium conveying device of FIG. 1 .

Fig. 3 is a side view showing a recording medium transport device according to a second embodiment of the present invention.

Fig. 4 is a side view showing a recording medium transport device according to a third embodiment of the present invention.

5 is a perspective view showing an inkjet printer including a recording device of the recording medium conveying device of the present invention.

FIG. 6 is a plan view showing main parts of the ink jet printer of FIG. 5 .

Fig. 7 is a front view showing main parts of the ink jet printer of Fig. 5 .

Fig. 8 is a side view showing a main part of the ink jet printer of Fig. 5 .

Fig. 9 is a schematic diagram showing only the main part of the printing paper conveying device for the conventional ink jet printer being drawn out.

Detailed ways

Next, an embodiment of an inkjet printer as a conveyance recording medium embodying a liquid fixing device according to the present invention will be described with reference to the drawings.

Fig. 1 is a side view showing a recording medium conveying device according to a first embodiment of the present invention. The recording medium conveyance device 100 includes a suction member 110 that keeps sucking the recording medium during recording, and a recording medium conveyance mechanism 150 that conveys the recording medium from the upstream side of the suction member 110 to the downstream side. The above-mentioned suction member 110 is arranged on the lower side with respect to the recording medium transport path L sandwiched between the recording head 231 for recording on the recording medium. And it is formed into the hollow box shape of the up-and-down two-stage structure which consists of the suction part 120 of an upper stage, and the attraction|suction generating part 130 of a lower stage.

The suction portion 120 has a decompression chamber 121 formed inside, and a plurality of suction chambers 123 formed as each slightly sunken rectangle on the recording medium conveyance surface 122 shown in FIG. 2 , and these suction chambers should be made 123 communicates with each decompression chamber 121 and extends vertically with a plurality of suction holes 124 smaller than the cross-sectional area of the above-mentioned suction chamber 123 .

Moreover, although the recording medium conveyance surface 122 is formed straight on the recording area 122A facing the recording head 231, it is inclined from the recording area 122A to the downstream area 122B from the upstream side to the downstream side, that is, It is formed as an upwardly curved surface (hereinafter referred to as a reversely curved surface) toward the discharge direction of the recording medium.

The suction generating unit 130 communicates with the decompression chamber 121 of the suction unit 120 through a communication hole 131 and has a pump 132 including a centrifugal fan inside. The pump 132 is installed at a predetermined position below the decompression chamber 121 so as to communicate with the decompression chamber 121 through the communication hole 131, and the centrifugal fan rotates during recording.

The recording medium conveying mechanism 150 has a conveying roller 151 for feeding the recording medium between the recording head 231 and the suction member 110, a driven roller 152 for pressing the conveying roller 151 from above, and a mechanism for discharging the recording medium to the outside. A discharge roller 153, and a toothed roller 154 contacting the discharge roller 153 from above. In addition, the discharge roller 153 and the toothed roller 154 may not be provided due to a structure in which the suction member 110 is movable in the discharge direction or the like.

As above, the suction hole 124 and the suction chamber 123 constitute the suction hole, and the suction hole 124 formed by a through hole with a small diameter not only improves the utilization rate of the available negative pressure for the characteristics of the pump 132, but also forms the The suction chamber 123 is a substantially rectangular concave portion having a larger area than the suction hole 124 and can generate a strong suction force for the recording medium.

In addition, the region 122B of the recording medium conveyance surface 122 is formed into a reverse curved surface, and since it is formed into a curved concave shape in which the recording medium is lifted and conveyed on the region 122B of the recording medium conveyance surface 122 toward the conveyance direction, it can be moved. Ripples that occur after recording can be prevented from developing. Since the leading end of the recording medium advances along the region 122B of the recording medium conveying surface 122 which is curved in a concave shape, the recording medium can be conveyed smoothly without trouble.

In the embodiment shown in FIG. 1, although the region 122B of the recording medium conveyance surface 122 is formed as a concavely curved inclined surface, it may be formed as a flat inclined surface. In this case, since the recording medium is bent at a predetermined angle when it enters the inclined surface, it is possible to exert concentrated force to move the corrugations with strong force. The elevation angle of the above-mentioned inclined surface is, for example, 2° to 15°, preferably 5° to 11°.

The recording medium conveying device 100 having such a structure works as follows. The transport roller 151 and the like are rotationally driven to feed the recording medium between the recording head 231 and the suction member 110 . In addition, the pump 132 is driven to cause suction to act on the suction hole 124 and the suction chamber 123 through the communication hole 131 and the decompression chamber 121 . As a result, the recording medium is conveyed onto the recording medium conveyance surface 122 in a suction state.

At the same time, the recording head 231 ejects ink particles to the recording medium while moving above the recording medium in the main scanning direction to perform recording. As a result, although there may be waviness on the recording medium after recording, it is transported and bent into a concave shape along the recording medium conveying surface 122 formed as an inversely curved surface on the recording medium, and the waviness is moved, prevent its development. Then, the discharge roller 153 and the like are rotationally driven to discharge the recorded recording medium to the outside.

3 is a side view showing the fixed object conveying device according to the second embodiment of the present invention as shown in FIG. 1, and the same components as those of the recording medium conveying device 100 shown in FIG. In this recording medium conveying device 160, the recording medium conveying surface 125 of the suction unit 120 is formed straight on the recording area 125A facing the recording head 231, and from the recording area 125A to the downstream area 125B, an upstream The slope that becomes lower toward the downstream side, that is, the ejection direction of the recording medium, is formed on the lower curved surface (hereinafter referred to as the positive curved surface), which is different from the recording medium conveyance device 100 shown in FIG. 1 .

Even if the region 125B of the recording medium conveyance surface 125 is made into a positively curved surface in this way, since the recording medium is conveyed and bent into a convex shape while hanging down by its own weight in the conveyance direction on the region 125B of the recording medium conveyance surface 125, after recording , able to displace the resulting ripples and prevent growth. Furthermore, since the leading end of the recording medium advances along the region 125B of the recording medium conveying surface 125 that is curved in a convex shape, the recording medium can be conveyed smoothly without hindrance.

Furthermore, in the embodiment shown in FIG. 3, although the region 125B of the recording medium conveyance surface 125 is formed as a convexly curved slope, it may be formed as a straight slope. In this case, since the recording medium is bent at a predetermined angle when it enters the slope, it is possible to apply the migration waviness with a strong concentration. The depression angle of the above-mentioned inclined surface is, for example, 2° to 15°, preferably 5° to 11°.

4 is a side view showing a recording medium conveying device according to a third embodiment of the present invention corresponding to FIG. 1. The same components as those in the recording medium conveying device 100 shown in FIG. In this recording medium conveying device 170, the recording medium conveying surface 126 of the suction unit 120 is also formed horizontally from the recording region 126A to the downstream region 126B in the recording region 126A facing the recording head 231, but since the recording region 126A A step 126C between 126A and 126B is formed higher than the region 126B on the downstream side, which is a different structure from the recording medium transport device 100 shown in FIG. 1 .

Even if the step 126C is formed between the regions 126A and 126B of the recording medium conveying surface 126, the recording medium is bent into an "S" shape while being conveyed while being transported while the recording medium hangs down in the conveying direction on the region 126B of the recording medium conveying surface 126. So moving the ripples that occur after recording can prevent their development. The step 126C is approximately the same as the width of the recording medium in the width direction, and preferably has a height of 1 mm to 5 mm, for example.

5 is a perspective view showing an inkjet printer as a recording device including the recording medium conveying device of the present invention, and FIGS. 6 to 8 show a plan view, a front view, and a side view of main parts thereof. The inkjet printer 200 has an automatic sheet feeder (ASF) unit 220 installed obliquely on the rear upper part of the printer body 210 , a recording unit 230 and a recording medium transport device 100 built in the printer body 210 . As the recording medium, special printing paper of the inkjet printer 200 , plain paper, etc., OHP film, drawing paper, postcard, etc. can be used.

Moreover, in this embodiment, there is no need for the discharge roller 153 and the toothed roller 154, and the suction member 110 that can move in the discharge direction is provided. The inkjet printer 200 of the medium conveying device 160 is also applicable to the recording medium conveying surface 122 having a reverse curved surface as shown in Figure 1 or the recording medium conveying surface 126 with steps as shown in Figure 4 , and then , a recording medium conveying device 100, 170 having a discharge roller 153 and a toothed roller 154.

The ASF unit 220 includes a paper box 221 for storing printing paper 1, and a paper feed roller 222 that draws out the printing paper 1 from the printing box 221 and supplies the printing paper 1. The recording unit 230 includes a stage 233 on which a recording head 231 and an ink cartridge 232 are mounted, a DC motor 235 that moves the stage 233 on a guide shaft 234 arranged along the main scanning direction, and the like. Recording head 231, for example, for each blue (cyan), red (magenta), yellow (yellow), light blue (light-cyan), light red (light-mazenta), light yellow (light-yellow), black (black) ) color, for example, a nozzle column consisting of 96 nozzles.

The ink jet printer 200 thus constituted works as follows. After a recording command for the printing paper 1 stored in the printing paper box 221 is input through a host computer not shown in the figure, the paper feed roller 222 is driven and rotated, and the printing paper 1 stored in the printing paper box 221 is fed out and fed by a single page. . Further, the transport roller 152 and the like are driven and rotated to feed the printing paper 1 between the recording head 231 and the suction member 110 .

In addition, the pump 132 is driven to cause suction to act on the suction hole 124 and the suction chamber 123 through the communication hole 131 and the decompression chamber 121 . Then, the printing paper 1 is conveyed in a state where the printing paper 1 is suction-adhered to the recording medium conveyance surface 125 . At the same time, the DC motor 235 is driven to move the stand 233 along the guide shaft 234 through the timing belt.

At this time, the recording head 231 sprays the ink corresponding to each color supplied from the ink cartridge 232 onto the printing paper 1 by all or part of the many nozzles as tiny ink droplets for recording. As a result, although wrinkles may occur on the printed printing paper 1 after recording, the printing paper 1 is transported along the recording medium transport surface 125 formed as a positively curved surface to be curved into a convex shape, and the wrinkles move. and prevent its development. Then, the discharge roller 153 and the like are driven to rotate, and the printed printing paper 1 that has been recorded is discharged from the discharge port 201 to the outside.

As described above, according to the recording medium conveying device and recording device of the present invention, even if the recorded recording medium is wrinkled along the conveying direction, when the recording medium is conveyed while bending in the conveying direction, its The corrugations are moved so that the corrugations can be prevented from developing. Therefore, the distance between the recording medium and the recording head can be minimized and uniformed, and stable transportation can be performed, so that recording accuracy can be improved and contamination caused by contact between the recording medium and the recording head can be prevented.

Claims (5)

1. A fixed part conveying device, which is a fixed part conveying device that transports the supplied fixed part while attracting on the fixed part conveying surface, and is characterized in that: The to-be-fixed object conveyance surface forms a step between a fixing region to which the to-be-fixed object is fixed and a region from the fixing region to a downstream side in a conveying direction. 2. The fixed object conveying device according to claim 1, characterized in that: The step is formed such that the fixing area is higher than the downstream side area. 3. The fixed object conveying device according to claim 1 or 2, characterized in that: The fixing area and the downstream area are formed straight. 4. The fixed object conveying device according to claim 1, characterized in that: There are a plurality of suction holes on the conveying surface of the fixed part, and a decompression chamber communicating with the plurality of suction holes, and a suction mechanism for sucking the air in the decompression chamber; The suction hole of the decompression chamber, and the suction member of the suction chamber whose area of the suction surface facing the fixed member is larger than the cross-sectional area of the suction hole. 5. A liquid fixing device, characterized in that: The to-be-fixed object conveyance apparatus as described in any one of Claims 1-4 is provided.

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