JP2000296600A - Printing apparatus or pattern transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance printing accuracy, in a printing machine using a press sheet, by preventing such a phenomenon that the surface of the press sheet adheres to the surface of a work. SOLUTION: A printing pattern is formed on the surface of a press sheet 20. The press sheet 20 is provided to a sheet frame under tension and held in such a state that the surface thereof is turned downward to be opposed to a work 10. A guide roller 53 is arranged behind the advance direction of a press roller 50 to come into contact with the rear surface of the press sheet 20 in such a state that a slight gap is provided between the surface of the press sheet 20 and the surface of the work 10. A suction head 57 is provided between the press roller 50 and the guide roller 53 and, immediately after the press roller 50 passes on the rear surface of the press sheet 20, the press sheet 20 is sucked upwardly by a suction nozzle 55 to be separated from the surface of the work 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device or a printing apparatus for transferring a pattern described above onto a surface of a work by pressing a press sheet having a predetermined pattern formed on the surface by irregularities or the like. The present invention relates to a transfer device. INDUSTRIAL APPLICABILITY The present invention can be applied to an intaglio direct printing press, a letterpress direct printing printing press, an offset printing press, or a press forming apparatus using a press sheet having a surface formed with a forming pattern by unevenness.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional intaglio direct printing press. In the drawing, 10 is a work (substrate to be printed), 20 is a press sheet, 27 is a support sheet, 25 is a sheet frame, 31 is a table, 33 is a holder, 34 is a gantry, 35
Is a reversing mechanism, 37 is a support base, 40 is an ink supply device, 5
0 represents a press roller.

The work 10 (substrate to be printed) is placed on a table 31
It is held on the upper surface.

[0004] The press sheet 20 has a predetermined printing pattern formed on its surface by grooves, and is used as an intaglio. The press sheet 20 is attached to a seat frame 25 via a support sheet 27 (made of steel wire mesh material) at both ends in the longitudinal direction (the left-right direction in FIG. 3) and stretched horizontally. I have. Seat frame 25
Is attached to the holder 33, and one end of the holder 33 is the shaft 3
6 and the other end is supported on a gantry 34. In this posture, the press sheet 20 faces the work 10 on the table 31 with a slight gap, with its surface (that is, the printing surface) facing down.

[0005] On the back side of the press sheet 20, a press roller 50 is arranged.

The holder 33 to which the seat frame 25 is attached is connected to a reversing mechanism 35 via a shaft 36. By driving the reversing mechanism 35, the shaft 36
, The press sheet 20 can be placed on the support 37 with the surface facing up.

The ink supply device 4 is provided above the support table 37.
0 is provided. The ink supply device 4 is placed on the surface of the press sheet 20 which is turned over and placed on the support table 37.
Ink is supplied from 0.

Next, an operation method of the apparatus will be described.

First, the press sheet 20 attached to the seat frame 25 is placed on a support 37 with its surface facing upward. In this state, the ink is supplied from the ink supply device 40 to the grooves formed on the surface of the press sheet 20. At the same time, the work 1 is placed on the table 31.
Set 0.

Next, the seat frame 25 is turned around the axis 36 using the turning device 35, and the seat frame 2 is turned over.
The other end of 5 is placed on the gantry 34. In this state, as described above, the press sheet 20 faces the work 10 on the table 31 with a slight gap, with the surface thereof facing down.

Next, a press roller 50 is pressed against the back surface of the press sheet 20 and is rolled in the longitudinal direction of the press sheet 20 (from the right end to the left end in the example shown in FIG. 1). Thereby, the press sheet 20 is pressed onto the work 10, and the ink provided in the grooves on the surface of the press sheet 20 is transferred to the surface of the work 10.

(Problems of the conventional apparatus) In order to improve and stabilize the positional accuracy of the print pattern transferred to the surface of the work 10, the surface of the press sheet 20 must be
In a state where the press sheet 20 is supported via the sheet frame 25 so as to face the surface of the
It is desirable to make the distance between the surface of the work 10 and the surface of the work 10 as narrow as possible.

However, if the above distance is too small, the surface of the press sheet 20 is pressed against the surface of the work 10 by the adsorbing force generated between the surface of the press sheet 20 and the surface of the work 10 and the adhesive force due to the viscosity of the ink. And the press sheet 20 is difficult to separate from the work 10.

FIG. 4 shows this situation. The length (L) of the attachment portion is usually about 20 to 50 mm. But,
When the moving speed of the press roller 50 is high, when the adhesive force between the press sheet 20 and the work 10 is large, or when the interval between the press sheet 20 and the work 10 is too small, the surface of the work 10 is All of them may adhere to the surface of the press sheet 20.

In order to cope with such a problem, a method of gradually raising one end of the seat frame 25 (the end located on the rear side with respect to the traveling direction of the press roller 50) has been implemented (see FIG. 1). However, in a screen printing machine). However, in such a method, the press sheet 20
Is increased, and the printing accuracy is reduced. Further, with the repetition of the printing operation, the tension of the press sheet 20 decreases, causing a printing defect.
It also becomes a factor of shortening the life of the battery.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of a conventional printing press or the like using a press sheet, and an object of the present invention is to provide a printing method using a press sheet. By preventing the press sheet surface from adhering to the work surface in machines and the like, it is possible to reduce the distance between the press sheet surface and the work surface, thereby improving printing accuracy. It is to plan.

[0017]

According to the present invention, there is provided a printing apparatus comprising: a press sheet having a printing pattern formed by concave portions on a surface thereof; a sheet frame to which the press sheet is fixed at both ends in a longitudinal direction; In a state where the surface of the press sheet is opposed to the surface of the work with a slight gap therebetween, a support mechanism that supports the sheet frame, and a press roller that presses the press sheet against the work, By rolling the press roller longitudinally on the back of the press sheet,
In a printing apparatus that transfers the ink filled in the recesses to the surface of the work, the printing apparatus is supported by a common moving frame with the press roller, and is disposed rearward in the traveling direction of the press roller. A guide roller that comes into contact with the back surface of the press sheet with a slight gap between the surface of the work and a guide roller that is provided on the moving frame and is disposed between the press roller and the guide roller; And a suction nozzle for sucking the press sheet from the back side and separating the press sheet from the work.

Preferably, a suction head is provided on the moving frame. The suction head is disposed between the press roller and the guide roller. The front surface of the suction head, in a state where the back surface of the press sheet is on a common tangent to the press roller and the guide roller,
It is opposed to the back surface of the press sheet via a slight gap. An edge protruding stepwise along the outer periphery and a recess surrounded by the edge are formed on the front surface of the suction head, and the suction nozzle is opened at the bottom of the recess. In this way, a reduced pressure atmosphere is formed in the depression.

As a press sheet, in addition to an intaglio direct printing press using an intaglio type printing plate as described above, a letterpress direct printing printing using a letterpress type printing plate is used. Roller and suction nozzle having the above-mentioned configuration for a printing machine, an offset printing machine using a blanket sheet, or a pattern transfer apparatus (forming apparatus) using a machine in which a forming pattern is formed on the surface by unevenness. Can be used.

According to the printing apparatus (or the pattern transfer apparatus) of the present invention, immediately after the press roller passes over the back surface of the press sheet, the suction force of the suction nozzle ensures that the surface of the press sheet is removed from the work surface. Be separated. Further, by adjusting the distance from the surface of the work to the surface of the guide roller, the distance to be separated can be set to an appropriate range.

As a result, it is possible to reduce the distance between the surface of the press sheet and the surface of the work in a state where the press sheet is held facing the work, and high printing accuracy (or pattern transfer accuracy) can be achieved. Can be realized.

Further, according to the printing apparatus (or the pattern transfer apparatus) of the present invention, since the press sheet does not cause large distortion, there is no problem that the life of the press sheet is shortened.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a main part of an intaglio direct printing press according to the present invention. In the figure, 10 is a work (substrate to be printed), 20 is a press sheet, 31 is a table, 50
Denotes a press roller, 51 denotes a moving frame, 53 denotes a guide roller, 55 denotes a suction nozzle, 57 denotes a suction head, 58 denotes an edge, and 59 denotes a depression.

The overall configuration of this intaglio direct printing press is the same as that of the conventional intaglio direct printing press described above with reference to FIG. 3, and the periphery of the press roller 50 shown in FIG. Only the structure is different from the conventional intaglio direct printing press. Therefore, the description of the overall configuration is omitted here,
Only the structure around the press roller 50 will be described.

The work 10 (substrate to be printed) is
It is held on the upper surface.

The press sheet 20 has a predetermined printing pattern formed by grooves on its surface, and is used as an intaglio. The press sheet 20 is attached to a seat frame (25, FIG. 3) via support sheets (27, FIG. 3) at both ends in the longitudinal direction (the left-right direction in FIG. 1), and is stretched horizontally. The press sheet 20 has a work 1 on a table 31 with its surface (that is, the printing surface) facing downward.
It is held in a state in which it faces 0 with a slight interval.

On the back side of the press sheet 20, a press roller 50 is arranged. The moving roller 51 supporting the press roller 50 further supports a guide roller 53 in parallel with the press roller 50. The guide roller 53 is disposed rearward in the traveling direction of the press roller 50, and the lowermost point on the surface of the guide roller 53 is located slightly above the lowermost point on the surface of the press roller 50. Therefore, the guide roller 53 contacts the back surface of the press sheet 20 with a slight gap provided between the surface of the press sheet 20 and the surface of the work 10.

Further, a suction head 57 is mounted below the moving frame 51 between the press roller 50 and the guide roller 53. The front surface (lower surface) of the suction head 57 has a rear surface of the press sheet 20 and a press roller 5.
0 and the guide roller 53 (that is, the back surface of the press sheet 20 is on the common tangent line between the press roller 50 and the guide roller 53), a slight gap is formed with respect to the back surface of the press sheet 20. Facing each other. On the front surface of the suction head 57, an edge 58 protruding stepwise along the outer periphery and a recess 59 surrounded by the edge 58 are formed. A suction nozzle 55 is opened at the bottom of the recess 59.
The suction nozzle 55 is connected to an external vacuum pump (not shown) via a pressure reducing path 56 formed inside the moving frame 51.

The inside of the depression 59 formed on the front surface of the suction head 57 is depressurized through the suction nozzle 55, so that the rear surface of the press sheet 20 is pressed by the press roller 5.
Immediately after the zero passes, the press sheet 20 is sucked upward, and the press sheet 20 is separated from the surface of the work 10.

Further, by adjusting the distance from the surface of the work 10 to the surface of the guide roller 53, the distance to be separated can be set to an appropriate range.

In this example, the press roller 50 is
The press roller 50 is accommodated in a substantially cylindrical cavity provided in the moving frame 51, and a part of the surface of the press roller 50 is exposed from the lower surface of the moving frame 51. Press roller 50
Are supported in this cavity via an air bearing. Similarly, the guide roller 53 is housed in a substantially cylindrical cavity provided in the moving frame 51,
3 is partially exposed from the lower surface of the moving frame 51. The guide roller 53 is also supported in this cavity via an air bearing.

FIG. 2 schematically shows how the press sheet 20 is deformed when the back surface of the press sheet 20 is sucked by the suction head 57. By pressing the press sheet 20 from the back, as shown in FIG.
The gap (δ2) between the work 10 and the press sheet 20 at an intermediate position between the press roller 20 and the guide roller 53 is the gap when the press sheet 20 is assumed to be linearly stretched between the press roller 50 and the guide roller 53. It is larger than (δ1). Thereby, the surface of the press sheet 20 can be reliably separated from the surface of the work 10.

(Example 1) Using a composite sheet in which a silicone rubber layer (0.2 mm thick) was laminated on a steel sheet (0.3 mm thick), a press sheet having a relief plate formed on the surface was prepared. Letterpress printing was performed using a letterpress direct printing press according to the invention. As a result, a relatively large printing area (300 m
mx 300mm), the position accuracy of the printing image is ± 15μ
m, and good results were obtained.

(Example 2) Using a composite sheet in which a silicone rubber layer (0.2 mm thick) is laminated on a steel sheet (0.3 mm thick), a pattern is formed by grooves having a predetermined sectional shape on the surface. Pressed sheet was created. These grooves were filled with a glass paste as ink, and the press sheet was pressed onto the substrate using an intaglio direct printing press according to the present invention to transfer the glass paste onto the substrate.
As a result, a projection having a sectional shape of 0.17 mm in height and 0.08 mm in width was formed with a shape accuracy of ± 10 μm and ± 20 μm.
m could be formed on the substrate with a positional accuracy of m.

(Example 3) Using a composite sheet in which a hard silicone rubber layer (0.2 mm thick) is laminated on a steel sheet (0.3 mm thick), a press in which a predetermined forming pattern is formed by unevenness on the surface. Created a sheet. Using a pattern transfer device according to the present invention, this press sheet was pressed against a substrate provided with a clay-like skin layer on the surface, and the molding pattern on the surface of the press sheet was transferred to this skin layer. As a result, a protrusion having a sectional shape of 0.15 mm in height and 0.08 mm in width was formed with a shape accuracy of ± 15 μm and ± 20 μm
Could be formed on the substrate with the positional accuracy of.

[0036]

According to the printing apparatus (or pattern transfer apparatus) of the present invention, the surface of the press sheet can be separated from the surface of the work without tilting the sheet frame with the movement of the press roller. Therefore, when the press sheet is held facing the work, the distance from the work surface to the press sheet surface can be reduced, and printing (or patterning) can be performed while the sheet frame is fixed. Transfer). Therefore, high printing accuracy (or pattern transfer accuracy)
Is obtained.

Further, according to the printing apparatus (or the pattern transfer apparatus) of the present invention, since no large distortion is generated in the press sheet, there is no possibility of shortening the life of the press sheet.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main part of an intaglio direct printing press according to the present invention.

FIG. 2 is a schematic view showing a state of deformation of a press sheet.

FIG. 3 is a schematic configuration diagram of a conventional intaglio direct printing press.

FIG. 4 is a diagram illustrating a state in which a press sheet is attached to a surface of a work.

[Explanation of symbols]

 10 Workpiece, 20 Press Sheet, 25 Seat Frame, 27 Support Sheet, 31 Table, 33 Holder, 34 Stand, 35 Reversed Apparatus, 36: shaft, 37: support base, 40: ink supply device, 50: press roller, 51: moving frame, 53: guide roller, 55: suction nozzle Reference numeral 56 denotes a decompression path, 57 denotes a suction head, 58 denotes an edge, and 59 denotes a depression.

Claims (6)

[Claims] 1. A press sheet having a printed pattern formed by a concave portion on the surface, a sheet frame to which the press sheet is fixed at both ends in a longitudinal direction and stretched, and a surface of the press sheet on a surface of a flat work. A support mechanism for supporting the sheet frame in a state where the press sheet is opposed to the work sheet with a slight gap therebetween, and a press roller for pressing the press sheet against the work. In a printing device that transfers the ink filled in the concave portion to the surface of the work by rolling in the longitudinal direction, the printing device is supported by a common moving frame with the press roller, and is moved rearward in the traveling direction of the press roller. The press sheet is disposed in a state where a slight gap is provided between the surface of the press sheet and the surface of the work. A guide roller that contacts the back surface of the moving frame; and a suction nozzle that is provided on the moving frame and that is arranged between the press roller and the guide roller, and that sucks the press sheet from the back side and separates the press sheet from the work. And a printing device comprising: 2. A press sheet having a print pattern formed on its surface by a convex portion, a sheet frame to which the press sheet is fixed at both ends in a longitudinal direction and stretched; A support mechanism for supporting the sheet frame in a state where the surfaces face each other with a slight gap therebetween, and a press roller for pressing the press sheet against the work, wherein the press roller is provided on a back surface of the press sheet. In a printing apparatus that transfers the ink on the convex portion to the surface of the work by rolling in the longitudinal direction, the printing device is supported by a common moving frame with the press roller, and is disposed behind the press roller in the traveling direction. And, with a slight gap provided between the surface of the press sheet and the surface of the work, on the back of the press sheet A guide roller to be touched, and a suction nozzle provided on the moving frame, disposed between the press roller and the guide roller, and suctioning the press sheet from the back side to separate the press sheet from the work. A printing device, comprising: 3. A press sheet on which a printing pattern is formed by ink transferred to the surface, a sheet frame on which the press sheet is fixed at both ends in the longitudinal direction, and a press frame, and the press sheet on the surface of a planar workpiece. A support mechanism that supports the sheet frame in a state where the surfaces of the sheets are opposed to each other with a slight gap therebetween; and a press roller that presses the press sheet against the work. In a printing device that transfers the print pattern to the surface of the work by rolling in the longitudinal direction on the back surface, the printing device is supported by a common moving frame with the press roller, and is disposed rearward in the traveling direction of the press roller, The press sheet in a state where a slight gap is provided between the surface of the press sheet and the surface of the work A guide roller that contacts the back surface, and a suction nozzle that is provided on the moving frame, is disposed in the middle of the press roller and the guide roller, and sucks the press sheet from the back side to separate the press sheet from the work. A printing device, comprising: 4. The moving frame includes a suction head between the press roller and the guide roller, and a front surface of the suction head has a back surface of the press sheet on a common tangent of the press roller and the guide roller. In this state, the suction head is opposed to the rear surface of the press sheet via a small gap, and the front surface of the suction head is surrounded by an edge protruding stepwise along the outer periphery thereof and the edge. A depression is formed, the suction nozzle is opened at a bottom surface of the depression, and a reduced-pressure atmosphere is formed in the depression. A printing device according to claim 1. 5. A press sheet having a molding pattern formed on the surface by unevenness, a sheet frame on which the press sheet is fixed and fixed at both ends in a longitudinal direction, and a surface of the press sheet on a surface of a flat work. A support mechanism for supporting the sheet frame in a state where the press sheet is opposed to the work sheet with a slight gap therebetween, and a press roller for pressing the press sheet against the work. In a pattern transfer device that transfers the molding pattern to the surface of the work by rolling in the longitudinal direction, the pattern transfer device is supported by a moving frame common to the press roller, and is disposed rearward in a traveling direction of the press roller; With a small gap between the surface of the sheet and the surface of the work, the back of the press sheet is A guide roller, which is provided on the moving frame, is disposed in the middle of the press roller and the guide roller, and a suction nozzle that sucks the press sheet from the back side and separates the press sheet from the work; A pattern transfer device comprising: 6. The moving frame includes a suction head between the press roller and the guide roller, and a front surface of the suction head has a back surface of the press sheet on a common tangent of the press roller and the guide roller. In this state, the suction head is opposed to the rear surface of the press sheet via a small gap, and the front surface of the suction head is surrounded by an edge protruding stepwise along the outer periphery thereof and the edge. 6. The pattern transfer according to claim 5, wherein a depression is formed, the suction nozzle is opened at a bottom surface of the depression, and a reduced-pressure atmosphere is formed in the depression. apparatus.