JP3024274B2 - Printing apparatus and printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus and a printing method suitable for a printing apparatus having a plate mounting portion.

[0002]

2. Description of the Related Art A conventional gravure printing apparatus is configured as shown in FIG. In FIG. 5, reference numeral 1 denotes a printing apparatus as a whole. The ink stored in an ink plate 2 adheres to the surface of a gravure plate 5 wound around a plate cylinder 4 by the rotation of an ink roller 3, and the gravure plate 5 The ink is filled in the concave pattern formed in the above.

[0003] The ink adhering to the surface of the gravure plate 5 is scraped off by a doctor blade 6.
The ink filled in the concave pattern is sent from the paper supply unit to the impression cylinder 7 and printed on the printing paper 8 wound one by one.

[0004] The printed paper 11 is automatically removed from the impression cylinder 7, and the paper discharge roller 9a, the belt 10, and the reversing roller 9 are removed.
b and is stacked on the paper discharge unit.

[0005] For this purpose, the printed papers 11 stacked in the storage section 11 are inverted and laminated.

FIG. 6 shows an example of a method of mounting the gravure plate 5 wound around the plate cylinder 4 by the above-described printing apparatus 1. FIG. 6 is an exploded perspective view of the plate cylinder 4. The cylinder 12 is a metal cylinder. A gravure plate 5 of stainless steel or synthetic resin is wound along the outer diameter of the cylinder 12, and the plate screw 13 or the like is used. It is fixed to a set screw formed in the cylinder 12.

As a material when the gravure plate 5 is made of a synthetic resin, a thermoplastic resin having a relatively narrow melting range, being hard when cured, and being scattered or sublimated at a low temperature when melted, is preferred. A polyethylene resin, an acrylic resin, or the like can be used. When the gravure plate 5 is selected from a synthetic resin, a thickness t of about 200 microns is selected. Metal caps 14L and 14R are inserted into the left and right ends of the cylinder 12 so as to fix the left and right ends of the gravure plate 5, thereby forming the plate cylinder 4. Cap 14L, 1
The shafts 15L and 15R are erected on the 4R, and are connected to a plate cylinder rotation motor (not shown) to rotate the plate cylinder 4 in a predetermined direction.

[0008]

When the gravure plate 5 is fixed to the plate cylinder 4 by the conventional printing apparatus, pins and the like are planted on the plate cylinder 4 in addition to being fixed by the flathead screws 13 as described above. Then, a pin is inserted into a hole formed in the end of the gravure plate 5, and the gravure plate 5 is wound around the cylinder 12 of the plate cylinder 4 while being pulled, or both ends of the gravure plate 5 are sandwiched between the cylinders 12 of the plate cylinder 4. A mechanism was used to fix it by hand. Since any mounting method can be mechanically mounted, it is difficult to incorporate the automatic plate mounting portion into the printing apparatus 1, and the cylinder 1
2, the plate cylinder 4 to which the gravure plate 5 was fixed had to be manually installed in the printing apparatus 1.

Further, when multicolor printing is performed by a single-color printing apparatus, the printed paper 11 discharged to the paper discharge section is inverted and stacked, so that these papers are again used.
It was necessary to re-align and then put it on the paper feeding unit.

Further, in order to raise the printing surface of the printed paper 11 upward on the paper discharge section, it is necessary to use some reversing rollers to reverse the paper, and from the position of the paper discharge roller 9a to the reversing roller 9b. The distance becomes longer, and the paper feed unit and the paper discharge unit
As described above, since the printed paper 11 is brought to the opposite surface of the printing apparatus 1, the distance for returning the printed paper 11 to the paper feeding unit is large, and there is a problem that the movement is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to move a recorded paper 11 very quickly at the time of multi-color printing by a single-color printing apparatus. It is an object of the present invention to provide a printing apparatus which can reduce the depth direction of the printer and can provide a sufficient space for providing the automatic plate mounting portion.

[0012]

As shown in FIGS. 1 and 2, the printing apparatus of the present invention prints a printing paper 8 from a paper cassette 16 via an impression cylinder 7 and a plate cylinder 4. Then, in the printing apparatus 1 configured to discharge the printed paper 11 to a paper discharge cassette 17 having the same shape as the paper supply cassette 16, the paper supply cassette 16 is moved in one direction of a housing 18 of the printing apparatus 1. And a print surface for removably arranging a paper discharge cassette 18 so that the print paper 8 fed from the paper feed cassette 16 is printed by the impression cylinder 7 and the plate cylinder 4 so that the print surface of the print paper 8 becomes front. Conversion means 9a,
The sheet is discharged to the sheet discharge cassette 17 through the sheet feeder 32. According to the printing method of the present invention, the printing paper 8 is multicolor-printed from the paper supply cassette 16 through the impression cylinder 7 and the plate cylinder 4, and the printed paper 11 is discharged into the discharge cassette 18 having the same shape as the paper supply cassette 16.
In a multi-color printing method in which the paper is discharged to and subjected to multi-color printing,
Paper feed and discharge cassettes 16 and 17 are detachably disposed in one direction of a housing 18 of the printing apparatus 1, and after printing paper 8 fed from the paper feed cassette 16 is printed by the impression cylinder 7 and the plate cylinder 4, The printing paper 8 is discharged to the paper output cassette 17 with the printing surface of the printing paper 8 facing up. The paper output cassette 17 is brought to the paper feeding cassette 16 side, and the paper feeding cassette 16 is brought to the paper output cassette 17 side. The same printing and cassette exchange operations are repeated to perform multicolor printing on the printing paper 8.

[0013]

According to the printing apparatus of the present invention, the sheet cassette 16
A paper discharge cassette 17 is detachably provided in one direction, for example, a front surface of the housing 18.
The printed paper 11 printed via the plate cylinder 4 is replaced by a paper discharge roller 9a so as to be in the same direction as that at the time of paper supply, is discharged to the front side, and is stacked on the paper discharge cassette 17, so that monochrome printing is performed. It is possible to obtain a printer in which the printed paper 11 can be transferred very quickly during multicolor printing by the apparatus, can be performed easily, and the depth direction of the printing apparatus housing can be shortened.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a printing apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a printing apparatus as a whole, and a paper feed cassette 16 constituting a paper feed unit for storing print paper 8 and a paper discharge unit for storing printed paper 11 are provided in front of a housing 18. Are arranged vertically.

Printing paper 8 placed on paper feed cassette 16
Is locked at a predetermined position of the impression cylinder 7 by a locking claw of the impression cylinder 7 via the printing paper feed belt 19, and is then wound around and fixed to the impression cylinder 7.

The impression cylinder 7 is arranged so as to be in line contact with the plate cylinder 4. The impression cylinder 7 and the plate cylinder 4 are configured by winding a sheet-like gravure plate 5 around a cylinder 12, which will be described later. The plate mounting portion 20 constituting the plate cylinder 4 has a plate supply guide portion 21, and the sheet-like gravure plate 5 is fixedly wound around the cylinder 12 via the guide portion 21.

At the lower end of the plate cylinder 4, an ink supply device 22 is provided in a cassette shape.
Is provided with a handle 24, is configured to be easily pulled out from the housing 18, and is also provided with a doctor blade 6, an ink roller 3 (not shown), and the like. The ink is supplied from the ink container 2 to the ink supply device 22 via a pipe. Supplied.

By rotating the impression cylinder 7 in parallel with the ink roller 3 and the plate cylinder 4, the pattern formed on the plate 5 of the plate cylinder 4 is printed on the printing paper 8 wound around the impression cylinder 7, and the discharge roller 9a The printing paper 8 of the impression cylinder 7 is removed by the stopper 32 or the like, and the printed paper 11 is transferred through the printed paper feeding belt 23 to the discharge cassette 1.
7 to be stacked.

A method of automatically attaching the plate mounting portion 20 provided in the printing apparatus 1 to the plate 5 and the cylinder 12 constituting the plate cylinder 4 will be described with reference to FIGS. 2A and 2B.

The plate used for the plate cylinder 4 of the printing apparatus 1 of this embodiment includes, for example, an adhesive layer 25 applied to the back surface of a gravure plate 5 made of synthetic resin, and a release film 26 laminated on the adhesive layer 25. A release film-attached plate 29 is used. Release film 26 of plate 29 with release film
2A is peeled off to form a V-shaped bent portion 27 which is bent in a V-shape as shown in FIG. 2A.

The shaft 1 of the cylinder 12 forming the plate cylinder 4
Cut grooves 28 are formed along the 5L and 15R directions.
The depth d of the cut groove 28 is selected to be approximately the thickness of the plate 5.

Next, referring to FIG.
The configuration in which the cylinder 9 is automatically mounted on the cylinder 12 of the plate cylinder 4 will be described.

In FIG. 2A, the leading end of the release film 26 of the release film-attached plate 29 placed on the guide portion 21 is slightly peeled off, and the leading end of the plate 5 is engaged with the end of the cut groove 28 so that the plate 5
Is pressed against the plate portion where the release film 26 has been peeled off from the opposite side of the cylinder 12 of the plate cylinder 4 with a plate pressing roller 30 made of rubber or the like, and air is blown between the plate 5 and the cylinder 12 of the plate cylinder 4. The roller 30 is rotated freely so as to prevent the toner from entering.

As shown in FIG. 2A, the peeling film 26 having the V-shaped bent portion 27 peeled off is separated from the opposite side of the cylinder 12 of the plate cylinder 4 by a peeling roller 31 made of rubber or the like.
Is pressed. The peeling roller 31 is rotated in synchronization with the rotation of the cylinder 12 of the plate cylinder 4 so that the rotation direction becomes the same.

If the circumferential speed of the peeling roller 31 is set to be substantially the same as the circumferential speed of the cylinder 12 of the plate cylinder 4, or if the circumferential speed of the cylinder 12 is selected to be slightly faster than the circumferential speed of the cylinder 12, when the cylinder 12 of the plate cylinder 4 rotates, the peeling film 26 and Since there is no slip between the peeling rollers 31 and there is a slip between the peeling film 26 and the cylinder 12, the plate 5 is moved while the peeling film 26 is peeled off.
Will be automatically wound around the cylinder 12.
Finally, as shown in FIG. 2B, the plate 5 is wound around the cylinder 12 to form the plate cylinder 4.

The operation of the printing apparatus 1 having the above configuration will be described with reference to FIGS. FIGS. 3 and 4 are side views of main parts of the printing apparatus 1 of FIG.

The printing paper 8 stacked on the paper feed cassette 16 in FIG. 3 is received from the printing paper feed belt 19 by a locking claw provided on the impression cylinder 7 and wound around the impression cylinder 7 to be fixed. The pattern of the cylinder 4 is printed on the printing paper 8. The printed paper 11 after printing is locked by the stopper 32,
The printing paper 8 rotated clockwise along the circumference of the paper discharging roller 9a and stopped by the stopper 32 is dropped on the printed paper feed belt 23, the printing surface is formed on the upper side, and the printing paper 8 is formed on the paper discharging cassette 17. The sheet is transported and stacked on the sheet discharge cassette 17.

According to the feeding and discharging operations of the printing apparatus and the printing method, the upper surface of the printed paper 11 placed on the discharging cassette 17 at the time of discharging is placed on the feeding cassette 16. Since it is in the same direction as the upper surface of the printing paper 8, as shown in FIG. 4, the empty paper feed cassette 16 is brought to the lower paper output cassette 17 side, and the paper output cassette 17 is kept as it is in the upper paper feed cassette. If the sheet is moved to the 16 side and multi-color printing or the like is performed, the paper exchange only needs to move the entire cassette, it is not necessary to rearrange the printed paper, and the exchange operation can be performed very easily with a short distance.

In the above-described configuration, the paper feed cassette 16 and the paper discharge cassette 17 are exchanged by hand. However, when the predetermined number of sheets have been printed, the paper count is detected, and the paper feed cassette 16 is moved horizontally or horizontally. The operation of returning the sheet cassette 16 to the position of the discharge cassette 17, which is lowered after moving the sheet cassette 17 out of the housing 18 and then moving the sheet cassette 17 upward, is simply configured using a motor and a lifting / lowering means. It can also be done. In this way, automation can be performed without using hands.

Since the printing apparatus of the present invention is operated as described above, it is possible to transfer the printed paper very quickly and easily when performing multi-color printing with a single-color printing apparatus. Are provided in the same direction.
Is provided, and a printing apparatus capable of automatically winding a plate is obtained. Further, if the size of the printing apparatus is the same, the distance from the printing portion to the paper discharging means can be increased, so that the drying time of the ink can be increased.

[0032]

According to the present invention, it is possible to obtain a printing apparatus capable of transferring printed paper at the time of multicolor printing very quickly, shortening the width direction of the printing apparatus, and incorporating a plate automatic mechanism. Can be

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an embodiment of a printing apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a plate mounting unit used in the printing apparatus of the present invention.

FIG. 3 is an explanatory diagram of a sheet feeding and sheet discharging operation of the printing apparatus of the present invention.

FIG. 4 is an explanatory diagram of a paper ejection cassette replacement operation of the printing apparatus of the present invention.

FIG. 5 is a configuration diagram of a conventional printing apparatus.

FIG. 6 is an exploded perspective view of a conventional plate cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing device 4 Plate cylinder 7 Impression cylinder 8 Printing paper 11 Printed paper 16 Paper feed cassette 17 Paper discharge cassette

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 21/00 G03G 15/00 B65H 1/26 B65H 31/00

Claims (2)

(57) [Claims] 1. A printing apparatus which prints printing paper from a paper feed cassette via an impression cylinder and a plate cylinder, and discharges the printed paper to a paper discharge cassette having the same shape as the paper feed cassette. A paper cassette and a paper discharge cassette are detachably arranged in one direction of a housing of the printing apparatus, and the printing paper fed from the paper cassette is printed on the impression cylinder and the plate cylinder after printing. A printing apparatus characterized in that the printing paper is discharged to the discharge cassette via a printing surface conversion unit that causes the printing surface of the printing paper to be turned upside down. 2. A multi-color printing apparatus which performs multi-color printing of printing paper from a paper supply cassette via an impression cylinder and a plate cylinder, and discharges the printed paper to a discharge cassette having the same shape as the paper supply cassette. In the color printing method, the paper feeding and discharging cassette is detachably disposed in one direction of a housing of a printing apparatus, and the printing paper fed from the paper feeding cassette is transferred to the impression cylinder and the plate cylinder. After printing, the printing paper is discharged to the paper discharge cassette such that the printing surface of the printing paper is turned upside down, and the paper discharge cassette is brought to the paper supply cassette side, and the paper supply cassette is brought to the paper discharge cassette side. And a multi-color printing on the printing paper by repeating the same printing and cassette exchange operations as described above.