JP2000085160A - Color proof making system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect an image recording face against damage by feeding a recording sheet without rubbing the image recording face. SOLUTION: A rotor 410 for feeding only the uppermost recording sheet 1, a first carrying pair rollers 420 for carrying the recording sheet 1 while clamping the breadthwise direction thereof continuously, a first supply guide 430 for guiding the face opposite to the image recording face, a second carrying pair rollers 440 for carrying the recording sheet 1 while clamping the breadthwise direction thereof continuously, a second supply guide 450 for guiding the face opposite to the image recording face, and a roller 460 for pressing the recording sheet 1 against a drum 100. The recording sheet 1 is carried while being turned over from a sheet cassette 500 to the drum 100. The first supply guide 430, the second supply guide 450 and a discharge guide 350 guide the face of the recording sheet 1 opposite to the image recording face and the image recording face of the recording sheet 1 is not touched, it is protected against damage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color proof forming apparatus for recording a color proof image by ejecting ink droplets on an image recording surface of a recording sheet based on image data corresponding to color separation halftone document image data. .

[0002]

2. Description of the Related Art Conventionally, when producing a color print, a Y (yellow) plate, an M (magenta) plate, a C (cyan) plate,
A printing plate of a K (black) plate was created, and printing was performed on each printing plate using ink of each color.

[0003] In order to create this printing plate, Y
Creates color separation screen original films separated into plates, M, C, and K plates, and prints Y, M, C, and K plates from each of the prepared color separation screen original films. Had been created.

[0004] The color separation original document film has been produced from a film obtained by cutting and pasting a color separation original film, a photo halftone original film, a solid image halftone original film, or the like.

[0005] Since a color separation screen original film is created by such an operation, an operation for confirming whether there is an error in the cutting and pasting operation, an error in color, an error in characters, etc. (proofing operation).
Has been done. Conventionally, such a proofreading operation has been performed by simply preparing a printing plate and temporarily preparing a printed matter.

In recent years, such a method has been more easily calibrated by creating a color proof directly from a color separation screen original film such as Consensus (trademark) manufactured by Konica Corporation.

In recent years, DTP (Desk Top Publ.)
ishing), and cuts and pastes image data from image data such as color-separated original image data, photographic original image data, and solid image original image data, and performs color-separated original image data. A color separation screen original film is created from this color separation screen original image data by a device called an imagesetter, or a CTP (Compu
ter To Plate) is used to directly make a printing plate.

The proofing work performed in such a system using DTP includes not only a method of creating a color separation screen original film from color separation screen image data and a method of forming a color proof from the color separation screen original film, DD that creates a color proof directly from color separation net document image data
CP (Digital Direct Color Proof) has recently been performed.

In this DDCP, a silver halide color photographic light-sensitive material is LE based on color separation screen original image data.
A method for creating a color proof by exposing with D or laser light, a method for creating a color proof with an ink transfer printer based on color separation screen document image data, and an inkjet method based on color separation screen document image data. There is a method of creating a color proof with a printer.

In the method of producing a color proof by exposing a silver halide color photographic light-sensitive material, there is a problem that a processing solution must be used or a waste liquid of the processing solution is generated.

In the method of producing a color proof by an ink transfer printer, there is a problem that an ink sheet after ink transfer is generated as a waste material. In contrast to these methods, the method of creating a color proof with an ink jet printer is to record images by ejecting minute droplets of ink onto a recording sheet such as paper, and it is possible to perform high-speed printing with less noise, It is inexpensive and has little waste liquid and waste material.

Conventional D using an ink jet printer
As the DCP, an ink jet printer having a print head for each color of Y (yellow), M (magenta), C (cyan), and K (black) is known.

[0013]

The image recording surface of the recording sheet used in the above-described DDCP ink jet printer has a low strength, and is easily damaged when a large pressure is applied.

Therefore, it is required that a large pressure does not act on the image recording surface of the recording sheet when the recording sheet is conveyed. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a color proof creating apparatus that does not cause a scratch on an image recording surface of a recording sheet.

[0015]

According to a first aspect of the present invention, there is provided a sheet holding member for holding a recording sheet, sheet feeding means for feeding the recording sheet to the holding member, and ink droplets. And a print head that discharges
A color proof creating apparatus that discharges ink droplets from a print head in accordance with color separation document image data to record a color proof image on an image recording surface of a recording sheet held by a sheet holding member, The feeding unit feeds the recording sheet without rubbing the image recording surface of the recording sheet.

The sheet feeding means feeds the recording sheet without rubbing the image recording surface of the recording sheet,
No large pressure acts on the image recording surface of the recording sheet, and the image recording surface of the recording sheet is not damaged.

According to a second aspect of the present invention, there is provided the color proofing apparatus according to the first aspect, wherein the sheet feeding means has a guide for guiding the recording sheet without contacting the image recording surface of the recording sheet. Device.

Since the guide guides the recording sheet without contacting the image recording surface of the recording sheet, the image recording surface of the recording sheet is not damaged. According to a third aspect of the present invention, a recording sheet is fixedly held on an outer peripheral surface, a feeding roller pair for continuously nipping and conveying the recording sheet over the entire width of the recording sheet, and fed by the feeding roller pair. A guide for guiding the recording sheet to the cylinder, and a print head for ejecting ink droplets, and ejecting ink droplets from the print head in accordance with image data corresponding to color separation screen document image data, The following (a) to (c) for recording a color proof image on the image recording surface of a recording sheet fixedly held by a fixing member
This is a color proof creation device that satisfies the condition (d).

(A) The shape of the outer peripheral surface is substantially a cylindrical surface. (b) the cylinder rotates about a substantially cylindrical axis of the cylindrical surface; (c) The cylinder axis of the cylinder is substantially horizontal.

(D) The guide guides a surface of the recording sheet opposite to the image recording surface. The guide guides the surface of the recording sheet opposite to the image recording surface, so that the image recording surface of the recording sheet is not damaged.

Since the column rotates around the column axis while fixedly holding the recording sheet on the holding surface having the cylindrical surface shape, the image recording surface of the recording sheet passes through a predetermined position in a predetermined direction, The distance between the leading end of the print head and the image recording surface of the recording sheet can be made very small, and the accuracy of the mounting position and direction of the print head with respect to the image recording surface of the recording sheet can be made extremely high.

For this reason, even when an on-demand type print head provided with a plurality of nozzles whose ejection directions of the ink droplets are not so fixed is used, the ink ejected from the print head and recorded on the image recording surface of the recording sheet. Drop position accuracy can be extremely high.

Since the position accuracy of the ink droplets can be made extremely high, a highly reproducible high-definition image can be recorded, and a color proof that can be used favorably for calibration can be produced.

"Cylindrical axis" and "cylindrical surface" are a cylindrical axis and a cylindrical surface in a geometrical sense. The cylindrical axis is a straight line, and the cylindrical surface is a circle on a plane perpendicular to the cylindrical axis. A surface formed by a straight line passing through the circumference and parallel to the cylinder axis.

The term "holding surface" refers to the surface of the place where the recording sheet is held in the area for holding the recording sheet, and the term "substantially cylindrical" means that the holding surface is substantially cylindrical. The location for holding the recording sheet may be substantially a cylindrical surface, and the other regions may be concave or not substantially non-cylindrical, such as not being present,
It may be substantially cylindrical.

The recording sheet may be held at all points in the area for holding the recording sheet. For example, the recording sheet such as a groove, a hole, a slit, or a hole may be held in a part of the area for holding the recording sheet. Even if there is a place not to be provided, the place for holding the recording sheet in the area for holding the recording sheet is
What is necessary is just a substantially cylindrical surface.

Examples of the form in which the cylinder fixedly holds the recording sheet include a form in which the cylinder fixedly holds the recording sheet by electrostatic attraction, a form in which the cylinder fixedly holds the recording sheet by means of a magnet, And a mode in which a cylinder holds a recording sheet fixedly by vacuum suction, but is not limited thereto.

The distance between the print head and the recording sheet is preferably restricted to 1 cm or less, and more preferably to 2 mm or less (particularly 1 mm or less).

According to a fourth aspect of the present invention, there is provided a press roller provided adjacently below the cylinder according to the third aspect of the present invention and pressing a recording sheet against the cylinder, and a sheet cassette accommodating the recording sheet. A second feeding roller that feeds the recording sheet, and a second guide that guides a surface of the recording sheet opposite to the image recording surface from the second feeding roller to the feeding roller pair, (E) to (g).

(E) The guide guides the recording sheet between the pressing roller and the cylinder. (d) During image recording, a part of the sheet cassette is located vertically below the cylinder.

(F) The sheet cassette stores the recording sheets so that the image recording surface faces upward. (g) The guide and the second guide have a guide shape for substantially reversing the recording sheet.

The guide guides the recording sheet to a position between the pressing roller and the cylinder so that the recording sheet is stably brought into close contact with the drum, and the distance between the print head and the recording sheet is kept constant. it can.

At the time of recording an image, at least a part of the sheet cassette is located vertically below the cylinder, and at least a part of the discharge tray and at least a part of the sheet cassette are horizontally positioned. Since it is located in the same arrangement direction as the cylinder and at least a part of the discharge tray is located vertically above the sheet cassette,
The installation area can be reduced.

The sheet cassette accommodates the recording sheet so that the image recording surface faces upward, and the guide and the second guide have a guide shape for substantially reversing the recording sheet, so that the image recording surface of the recording sheet is formed. It can be transported to the drum without rubbing.

According to a fifth aspect of the invention, there is provided a sheet holding member for holding a recording sheet, sheet discharging means for discharging the recording sheet from the sheet holding member, and a print head for discharging ink droplets. A color proof creating apparatus for ejecting ink droplets from a print head in accordance with image data corresponding to image data of a separation net document to record a color proof image on an image recording surface of a recording sheet held by a sheet holding member. The sheet discharging means discharges the recording sheet without rubbing the image recording surface, and is a color proof creating apparatus.

The sheet discharging means discharges the recording sheet without rubbing the image recording surface of the recording sheet,
No large pressure acts on the image recording surface of the recording sheet, and the image recording surface of the recording sheet is not damaged.

According to a sixth aspect of the present invention, there is provided a cylinder for holding a recording sheet fixedly on an outer peripheral surface, a discharge guide for guiding the recording sheet from the cylinder to a discharge tray, and a print head for discharging ink droplets. A color proof image is recorded on an image recording surface of a recording sheet fixedly held on the cylinder by discharging ink droplets from a print head in accordance with image data corresponding to color separation screen document image data. A color proof creating apparatus characterized by satisfying the following conditions (j) to (o).

(J) The shape of the outer peripheral surface is substantially a cylindrical surface. (k) the cylinder rotates about a substantially cylindrical axis of the cylindrical surface; (l) The cylinder axis of the cylinder is substantially horizontal.

(M) The discharge guide guides the surface of the recording sheet opposite to the image recording surface. (n) The position where the recording sheet is peeled off from the cylinder is above the discharge tray.

(O) The recording sheet is discharged from the outer peripheral surface of the cylinder to a discharge tray while being guided by a discharge guide by gravity. The discharge guide guides the surface of the recording sheet opposite to the image recording surface, so that the image recording surface of the recording sheet is not damaged.

The position where the recording sheet is peeled from the cylinder is set above the discharge tray, and the recording sheet is discharged from the outer peripheral surface of the cylinder to the discharge tray while being guided by the discharge guide by gravity. There is no need for a drive source for carrying out.

Since the column rotates around the column axis while fixedly holding the recording sheet on the holding surface having the cylindrical surface shape, the image recording surface of the recording sheet passes through a predetermined position in a predetermined direction, and The distance between the leading end of the print head and the image recording surface of the recording sheet can be made very small, and the accuracy of the mounting position and direction of the print head with respect to the image recording surface of the recording sheet can be made extremely high.

Therefore, even when an on-demand type print head provided with a plurality of nozzles whose ejection directions of ink droplets are not so constant is used, the ink ejected from the print head and recorded on the image recording surface of the recording sheet. Drop position accuracy can be extremely high.

Since the position accuracy of the ink droplets can be made extremely high, a highly reproducible high-definition image can be recorded, and a color proof that can be favorably used for calibration can be produced.

“Cylindrical axis” and “cylindrical surface” are a cylindrical axis and a cylindrical surface in a geometrical sense. The cylindrical axis is a straight line, and the cylindrical surface is a circle on a plane perpendicular to the cylindrical axis. A surface formed by a straight line passing through the circumference and parallel to the cylinder axis.

The term "holding surface" refers to the surface of the place where the recording sheet is held in the area where the recording sheet is held. The location for holding the recording sheet may be substantially a cylindrical surface, and the other regions may be concave or not substantially non-cylindrical, such as not being present,
It may be substantially cylindrical.

The recording sheet may be held at all points in the area for holding the recording sheet. For example, the recording sheet such as a groove, a hole, a slit, or a hole may be held in a part of the area for holding the recording sheet. Even if there is a place not to be provided, the place for holding the recording sheet in the area for holding the recording sheet is
What is necessary is just a substantially cylindrical surface.

Examples of the form in which the cylinder fixedly holds the recording sheet, such as the form in which the cylinder fixedly holds the recording sheet by electrostatic attraction, the form in which the cylinder fixedly holds the recording sheet by a magnet, And a mode in which a cylinder holds a recording sheet fixedly by vacuum suction, but is not limited thereto.

The distance between the print head and the recording sheet is preferably restricted to 1 cm or less, and more preferably to 2 mm or less (particularly 1 mm or less).

[0050]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A color proof creating apparatus according to the present embodiment is an apparatus capable of recording a color proof image by discharging ink droplets onto an image recording surface of a recording sheet based on color separation net document image data. is there.

FIG. 1 is a schematic sectional view of a color proof forming apparatus according to an embodiment, FIG. 2 is a schematic perspective view of the internal structure of the color proof forming apparatus shown in FIG. 1, and FIG. FIG.

First, the arrangement of the main components will be described with reference to FIG. At least a part of the sheet cassette 500 is located vertically below the drum 100, and at least a part of the discharge tray 310 and at least a part of the sheet cassette 500
0, and at least a part of the discharge tray 310 is located vertically above the sheet cassette 500,
The upper end of the discharge tray 310 is located at the same height or lower than the upper end of the drum 100.

The discharge tray 310 holds the recording sheet 1 so that it is higher near the drum 100. As the recording sheet 1 on which an image is recorded by the color proof creating apparatus of the present embodiment, the image recording surface is a surface on which an ink absorption layer having a large ink absorption amount per unit area is exposed. Is preferred, whereby
Good tone reproduction from high density to low density is possible.
The ink absorbing layer is preferably a void layer containing inorganic fine particles and a hydrophilic binder. The surface of the recording sheet 1 opposite to the image recording surface opposite to the image recording surface is formed as a slippery surface.

The sheet cassette 500 accumulates and stores a plurality of recording sheets 1 so that the image recording surface faces upward. A feeding roller 410 described later feeds from the uppermost recording sheet 1 of the plurality of recording sheets that have been deposited.

The recording sheets 1 are taken out one by one from the sheet cassette 500, supplied to the drum 100, and
0, the print head 200 ejects ink droplets on the recording sheet 1 held by the drum 100, and an image is recorded on the recording sheet 1.
Is discharged to the discharge tray 310.

The color proof forming apparatus according to the present embodiment converts the discharge of ink droplets from the print head 200 and the rotation of the drum 100 to continuous tone conversion of color separation halftone document image data. Based on the obtained continuous tone image data, a color proof image corresponding to the color separation halftone document image data is recorded on the image recording surface of the recording sheet fixedly held on the outer peripheral surface of the drum 100. I do.

The recording sheet 1 is supplied to the drum 100 from a sheet cassette 500 disposed below the drum 100 and the discharge tray 310. Between the sheet cassette 500 and the drum 100, a feed roller 41 that feeds only the uppermost recording sheet 1 among the stacked recording sheets 1 of the sheet cassette 500 while separating the recording sheets by a difference in frictional force.
0, a first conveying roller pair 420 for continuously nipping and conveying the recording sheet 1 in the width direction, and a first conveyance roller 420 for guiding the surface opposite to the image recording surface of the recording sheet 1 so as not to contact the image recording surface. A supply guide 430, a second pair of conveying rollers 440 for continuously nipping and conveying the recording sheet 1 in the width direction, and guiding the surface of the recording sheet 1 on the side opposite to the image recording surface and not contacting the image recording surface A second supply guide 450 and a pressing roller 460 for pressing the recording sheet 1 against the drum 100 are provided. The recording sheet 1 is transported from the sheet cassette 500 to the drum 100 while being turned upside down and supplied.

The drum 100 has an outer peripheral surface for fixedly holding the recording sheet 1 wound around the recording sheet 1 with the image recording surface facing outward during image recording. Drum 100
Are arranged so that the cylindrical axis of the cylindrical surface is horizontal, and the cylindrical axis rotates about this cylindrical axis. The drum 100 is driven to rotate at a constant rotation speed by a motor (not shown) during image recording.

The carriage 230 is mounted on the print head 20.
0 is fixedly held. Also, the print head 200
Are, as shown in FIG. 3, nozzle head stands 211, 21
3, 215, 217 are provided, and two nozzle heads are provided on each of the nozzle head stands 211, 213, 215, 217.

That is, the nozzle head 221 and the nozzle head 222 are provided on the nozzle head base 211, and the nozzle head 223 and the nozzle head 2 are provided on the nozzle head base 213.
24, the nozzle head base 215 has the nozzle head 22
5 and a nozzle head 226, and a nozzle head base 217 is provided with a nozzle head 227 and a nozzle head 228.

Each of the nozzle heads 221 to 228 has
A plurality of nozzles 220 are arranged in a column axis direction of the drum 100 within a range narrower than the image recording width.
As shown in FIG. 2, the moving means for moving the print head 200 in the direction parallel to the cylindrical axis of the drum 100 over the image recording width is rotatably held by a pulley 250 fixed to the motor shaft of the motor 240. The carriage 2 is attached to the belt 260 wound around the pulley 270.
30 is fixed, and the motor 230 rotates the pulley 250 so that the carriage 230
0 in the direction of the cylinder axis.

In this embodiment, the carriage 23
0 is movably engaged with the guide 245.
, And regulates the position of the carriage 230 (print head 200) in the direction perpendicular to the cylinder axis of the drum 100. That is, the print head 20
The rotation of 0 is stopped.

Ink containers 271 to 278 are provided for each of the nozzle heads 221 to 228. Nozzle head 2
For each combination of the ink containers 271-278 and the corresponding ink containers 271-278, the nozzle heads 221-228 and the corresponding ink containers 271-278 are connected to the flexible pipe 29.
1, 292 are connected. And pipe 2
The ends 91 and 292 are connected through a tractor unit 295 having one end fixed to the carriage 230.

The color proof forming apparatus according to the present embodiment rotates the drum 100 holding the recording sheet 1 at a predetermined position on the outer peripheral surface while rotating the print head 2.
00 discharges ink droplets in accordance with the color separation screen document image data, thereby recording a part of the image in the image recording area of the recording sheet 1 and moving the head section 210 by the head moving means to the cylindrical axis of the drum 100. , And alternately, the image in the entire image recording area of the recording sheet 1 is recorded.

After the image formation is completed, the motor 240 rotates the pulley 250 so that the carriage 230
Is moved in the direction of the cylindrical axis of the drum 100, the print head 200 is moved above the maintenance unit 600, and sucking, cleaning, and capping are performed.

As shown in FIG. 1, the color proof creating apparatus according to the present embodiment uses a recording sheet 1 on which an image is recorded.
And a discharge tray 310 provided on the side of the guide drum 100. The recording sheet 1 on which an image is recorded by the drum 100 is discharged to the discharge tray 310. Discharge.

Further, the discharge guide 350 is
Of the recording sheet 1 is guided from the side of the outer peripheral surface of the recording sheet 1 to the discharge tray 310 without contacting the image recording surface of the recording sheet 1 so that the fixed holding by the drum 100 is released. The sheet 1 is guided to the discharge tray 310 only by gravity. Then, the recording sheet 1 is discharged to the discharge tray 310 with the image recording surface facing up.

The discharge tray 310 has a plurality of recording sheets 1.
Can be accommodated. In addition, the discharge tray 310
The recording sheet 1 is provided obliquely so that the height on the drum 100 side is increased, and accommodates the discharged recording sheet 1.

The discharge tray 310 has a bat 330 slidable in the direction indicated by the arrow in FIG.
Is slid and pulled out, and the lower ends of the discharged recording sheets 1 are aligned and accommodated. When exchanging the sheet cassette 500, the sheet cassette 5
00, the recording sheet 1 cannot be supplied.
Since the sheet cassette 500 is exchanged while 0 is pushed in, the sheet cassette 500 can be easily exchanged.

The print head 200 may be provided with a heating heater inside the drum 100, an infrared lamp at a position facing the discharge guide 350, or an infrared lamp next to the head section 210. The structure is such that the recording sheet 1 is dried before the recording sheet 1 is discharged to the discharge tray 310 after the ink droplet is discharged onto the image recording surface.

According to the above configuration, the following effects can be obtained. (1) a first supply guide 430 for guiding the recording sheet 1;
The second supply guide 450 and the discharge guide 350 guide the surface opposite to the image recording surface of the recording sheet 1 and do not contact the image recording surface of the recording sheet 1 so that Does not hurt.

(2) Since the drum 100 rotates around the cylindrical axis while holding the recording sheet 1 fixedly on the cylindrical holding surface, the image recording surface of the recording sheet 1 is positioned at a predetermined position. , The distance between the leading end of the print head 200 and the image recording surface of the recording sheet 1 can be made very small, and the accuracy of the mounting position and direction of the print head 220 with respect to the image recording surface of the recording sheet 1 can be improved. Can be very high.

Therefore, even if an on-demand type print head provided with a plurality of nozzles whose ejection directions of ink droplets are not so constant is used, the ink is ejected from the print head 220 and is recorded on the image recording surface of the recording sheet. The position accuracy of the ink droplets can be very high.

Since the positional accuracy of the ink droplets can be made extremely high, a highly reproducible high-definition image can be recorded, and a color proof that can be used favorably for calibration can be produced.

(3) The second supply guide 450 is the pressing roller 4
By guiding the recording sheet 1 between the cylinder 60 and the cylinder 100, the recording sheet 1 can be stably adhered to the drum 100, and the interval between the print head 200 and the recording sheet can be kept constant.

(4) At least a part of the sheet cassette 500 is located vertically below the drum 100, and at least a part of the discharge tray 310 and at least a part of the sheet cassette 500 are cylindrical with respect to the horizontal position. Yo 10
Since the discharge tray 310 is located in the same arrangement direction and at least a part of the discharge tray 310 is located vertically above the sheet cassette 500, the installation area can be reduced.

(5) The sheet cassette accommodates recording sheets so that the image recording surface faces upward, and the first supply guide 43
The zero and second supply guides 450 have a guide shape that substantially reverses the recording sheet 1 so that they can be conveyed to the drum without rubbing the image recording surface of the recording sheet 1.

(6) The position where the recording sheet 1 is peeled off from the cylinder 100 is set above the discharge tray 310,
Is guided by the discharge guide 350 by gravity,
Since the recording sheet 1 is discharged from the outer peripheral surface of the cylinder 100 to the discharge tray 310, a driving source for unloading the recording sheet 1 becomes unnecessary.

[0079]

As described above, according to the first aspect of the present invention, the sheet feeding means feeds the recording sheet without rubbing the image recording surface of the recording sheet, thereby forming the recording sheet. No large pressure acts on the image recording surface, and the image recording surface of the recording sheet is not damaged.

According to the second aspect of the present invention, since the guide guides the recording sheet without contacting the image recording surface of the recording sheet, the image recording surface of the recording sheet is not damaged. According to the third aspect of the present invention, the guide guides the surface of the recording sheet opposite to the image recording surface, so that the image recording surface of the recording sheet is not damaged.

Since the column rotates around the column axis while fixedly holding the recording sheet on the cylindrical surface-shaped holding surface, the image recording surface of the recording sheet passes through a predetermined position in a predetermined direction, The distance between the leading end of the print head and the image recording surface of the recording sheet can be made very small, and the accuracy of the mounting position and direction of the print head with respect to the image recording surface of the recording sheet can be made extremely high.

Therefore, even when an on-demand type print head provided with a plurality of nozzles whose ejection directions of ink droplets are not so constant is used, the ink ejected from the print head and recorded on the image recording surface of the recording sheet. Drop position accuracy can be extremely high.

Since the positional accuracy of the ink droplets can be made very high, a very fine image with very high reproducibility can be recorded, and a color proof that can be used well for calibration can be produced.

According to the fourth aspect of the present invention, the guide guides the recording sheet between the pressing roller and the cylinder so that the recording sheet is stably adhered to the drum, and The distance between the sheet and the recording sheet can be kept constant.

At the time of image recording, at least a part of the sheet cassette is located vertically below the cylinder, and at least a part of the discharge tray and at least a part of the sheet cassette are located in the horizontal direction. Since it is located in the same arrangement direction as the cylinder and at least a part of the discharge tray is located vertically above the sheet cassette,
The installation area can be reduced.

The sheet cassette accommodates the recording sheet so that the image recording surface faces upward, and the guide and the second guide have a guide shape for substantially reversing the recording sheet, so that the image recording surface of the recording sheet is formed. It can be transported to the drum without rubbing.

According to the fifth aspect of the present invention, the sheet discharging means discharges the recording sheet without rubbing the image recording surface of the recording sheet, so that a large pressure does not act on the image recording surface of the recording sheet. The image recording surface of the recording sheet is not damaged.

According to the sixth aspect of the present invention, the discharge guide guides the surface of the recording sheet opposite to the image recording surface, so that the image recording surface of the recording sheet is not damaged. The position where the recording sheet is peeled from the cylinder is positioned above the discharge tray, and the recording sheet is discharged from the outer peripheral surface of the cylinder to the discharge tray while being guided by the discharge guide by gravity, so that the recording sheet is carried out. Drive source is unnecessary.

Since the column rotates around the column axis while fixedly holding the recording sheet on the cylindrical surface, the image recording surface of the recording sheet passes through a predetermined position in a predetermined direction. The distance between the leading end of the print head and the image recording surface of the recording sheet can be made very small, and the accuracy of the mounting position and direction of the print head with respect to the image recording surface of the recording sheet can be made extremely high.

Therefore, even if an on-demand type print head provided with a plurality of nozzles in which the ejection direction of ink droplets is not so constant is used, the ink ejected from the print head and recorded on the image recording surface of the recording sheet. Drop position accuracy can be extremely high.

Since the position accuracy of the ink droplets can be made very high, a highly reproducible high-definition image can be recorded, and a color proof which can be used well for proofreading can be produced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a color proof creating apparatus according to an embodiment.

FIG. 2 is a schematic perspective view of the internal structure of the color proof creating device shown in FIG.

FIG. 3 is a diagram of the print head viewed from its discharge direction.

[Explanation of symbols]

 1 Recording Sheet 100 Drum 200 Print Head 350 Discharge Guide 420 First Conveying Roller Pair 430 First Guide 440 Second Conveying Roller Pair 450 Second Guide 460 Pressing Roller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Matsushima 591-1 Kamihirose, Sayama-shi, Saitama F-term (reference) in Konica Corporation 2C056 EA11 EE09 FA14 HA28 HA29 2C059 DD03 DD05 3F101 FB00 FB02 LA06 LB03 5C074 AA20 BB16 BB22 CC01 CC26 DD09 DD24 DD28 EE08 FF15 GG08 GG09 GG12 GG15 HH04

Claims (6)

[Claims] 1. A color separation screen document image data comprising: a sheet holding member for holding a recording sheet; sheet feeding means for feeding the recording sheet to the holding member; and a print head for discharging ink droplets. A color proof creating apparatus that ejects ink droplets from a print head to record a color proof image on an image recording surface of a recording sheet held by a sheet holding member, wherein the sheet feeding unit includes: A color proof creating apparatus, wherein the recording sheet is fed without rubbing the image recording surface of the recording sheet. 2. The color proof creating apparatus according to claim 1, wherein said sheet feeding means has a guide for guiding without contacting an image recording surface of said recording sheet. 3. A cylinder for fixedly holding a recording sheet on an outer peripheral surface, a pair of feeding rollers for continuously nipping and conveying the entire width of the recording sheet, and a recording sheet fed by the pair of feeding rollers. A guide for guiding the ink to the cylinder, and a print head for ejecting ink droplets, and ejecting ink droplets from the print head in accordance with image data corresponding to the image data of the color separation screen original, to the fixing member A color proof creating apparatus for recording a color proof image on an image recording surface of a recording sheet fixedly held, which satisfies the following conditions (a) to (d). (a) The shape of the outer peripheral surface is substantially a cylindrical surface. (b) the cylinder rotates about a substantially cylindrical axis of the cylindrical surface; (c) The cylinder axis of the cylinder is substantially horizontal. (d) The guide guides a surface of the recording sheet opposite to the image recording surface. 4. A pressing roller provided below and adjacent to the cylinder, for pressing a recording sheet against the cylinder, and a second feeding roller for feeding the recording sheet from a sheet cassette containing the recording sheet. A second guide that guides a surface of the recording sheet opposite to the image recording surface from the second feeding roller to the feeding roller pair, wherein the following conditions (e) to (g) are satisfied: The color proof creating apparatus according to claim 3, wherein: (e) The guide guides the recording sheet between the pressing roller and the cylinder. (d) During image recording, a part of the sheet cassette is located vertically below the cylinder. (f) The sheet cassette accommodates the recording sheets so that the image recording surface faces upward. (g) The guide and the second guide have a guide shape for substantially reversing the recording sheet. 5. A color separation net document image data comprising: a sheet holding member for holding a recording sheet; sheet discharging means for discharging the recording sheet from the sheet holding member; and a print head for discharging ink droplets. What is claimed is: 1. A color proof creating apparatus for recording a color proof image on an image recording surface of a recording sheet held by a sheet holding member by ejecting ink droplets from a print head according to corresponding image data. Is a color proof creating apparatus for discharging a recording sheet without rubbing an image recording surface. 6. A color separation comprising: a cylinder for fixedly holding a recording sheet on an outer peripheral surface; a discharge guide for guiding the recording sheet from the cylinder to a discharge tray; and a print head for discharging ink droplets. According to the image data corresponding to the screen original image data, the ink droplets are ejected from the print head to record a color proof image on the image recording surface of the recording sheet fixedly held in the cylinder. A color proof creating apparatus, which satisfies the conditions of (o). (j) The shape of the outer peripheral surface is substantially a cylindrical surface. (k) the cylinder rotates about a substantially cylindrical axis of the cylindrical surface; (l) The cylinder axis of the cylinder is substantially horizontal. (m) The discharge guide guides a surface of the recording sheet opposite to the image recording surface. (n) The position where the recording sheet is peeled off from the cylinder is above the discharge tray. (o) The recording sheet is discharged from the outer peripheral surface of the cylinder to a discharge tray while being guided by a discharge guide by gravity.