JP2001341280A - Printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing press which can transfer precisely a printing material applied on a plate onto a printing object and can be applied also to the printing requiring high precision. SOLUTION: The printing material 18 is applied on the plate 6 bonded to a plate holding sheet 5 and the plate 6 is pressed on the printing object 2 from the rear of the sheet 5 through the medium of a roll 19 to transfer the material onto the object. In this printing press, the plate holding sheet 5 is constituted of a non-stretchable member, and a tension varying means 14 for varying the tension for the sheet 5 between the occasion of transferring the printing material 18 onto the printing object 2 and the occasion of peeling the plate 6 after the transfer of the material 18 is provided between the plate holding sheet 5 and a frame 9 for fixing the sheet 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a printing method comprising applying a printing material to a plate adhered to a plate holding sheet, and pressing the printing material from a back surface of the plate holding sheet onto a substrate through a roll. The present invention relates to a printing machine adapted to transfer a printing material.

[0002]

2. Description of the Related Art In recent years, this type of printing machine has a feature that its configuration is simple, and is widely used as a printing machine for printing on paper or the like with ink.

Conventionally, as this type of printing press, a printing press shown in FIGS. 9 to 11 has been known.

FIG. 9 is a view of the plate unit 40 viewed from the printing surface side. The plate unit 40 includes a plate 30, a plate holding sheet 31 to which the plate 30 is adhered, and a plate holding sheet 31. And a rectangular frame 32 having four sides fixed and holding the plate holding sheet 31 in a tensioned state.

The plate 30 is made of a material such as rubber, and the plate holding sheet 31 is made of a material such as elastic fiber or rubber.

[0006] Further, as shown in FIG.
Numeral 0 is rotatably mounted around a support shaft 33 provided on one end side (right side in the figure) of the frame 32, and can be superimposed on the table 34 or rotated and displaced to a position where the table 34 is opened. It is configured as follows.

During printing, the plate unit 40 is placed on the table 34, and the plate 30 is aligned with the printing material 35 placed on the table 34. To bring the plate 30 into close contact with the printing material 35. Then, the gantry 38 to which the roll 37 is attached is moved from one end of the plate 30 to the other end, so that the printing material 36 applied to the plate 30 is printed on the plate 34. Transferred to 35.

After the transfer, as shown in FIG. 11, the gantry 38 is retracted out of the movable area of the plate unit 40, and then the plate unit 40 is rotationally displaced about the support shaft 33 as a fulcrum. The plate 30 is peeled off from the substrate 35.

After that, the printed substrate 35 is replaced with a new substrate 35, and the next printing is performed again.

[0010]

However, in the above-described printing press, since the plate holding sheet 31 itself has elasticity, the plate 30 is distorted at the time of transfer and cannot be printed accurately. Further, even if the plate unit 40 is rotationally displaced so as to peel the plate 30 from the substrate 35, the plate 30 does not immediately come off the substrate 35, but turns to a certain angle and suddenly the plate 30 There is a problem that it may be peeled off from the surface 35, which also causes a failure to print accurately.

For this reason, there has been a problem that this type of conventional printing machine cannot be applied to high-precision printing such as forming a pattern on a printed circuit board or forming a partition of a plasma display device.

The present invention has been made based on the above circumstances, and an object of the present invention is to allow a printing material applied to a plate to be accurately transferred to a printing material and to be applied to printing requiring high precision. The purpose of the present invention is to provide a printing machine with a high quality.

[0013]

Means for Solving the Problems The present invention has the following means in order to solve the above problems and achieve the object.

That is, as described in the first aspect, the printing material is applied to the printing plate adhered to the printing plate holding sheet, and the printing plate is pressed from a back surface of the printing plate holding sheet onto a printing material via a roll. In a printing machine configured to transfer a material to a printing substrate, the plate holding sheet is formed of a non-stretchable member, and printing is performed between the plate holding sheet and a frame for fixing the plate holding sheet. There is provided a variable tension means for changing the tension applied to the plate holding sheet when transferring the material to the printing material and when removing the plate after transferring the printing material.

As described above, since the plate holding sheet is made of a non-stretchable member, distortion of the plate at the time of transfer due to shrinkage of the plate holding sheet can be prevented, and precise printing can be performed. Further, by providing a tension variable means for changing the tension on the plate holding sheet when transferring the printing material to the printing material and when peeling the plate after the transfer of the printing material, the plate holding sheet is lifted up when peeling. The transfer result can be prevented from being distorted due to the movement of the plate edge without being pulled and shifted. Therefore, the present invention can be applied to printing requiring high accuracy.

According to a second aspect of the present invention, the printing material is transferred to a printing medium by the forward movement of the roll, and the roll is moved back after the transfer of the printing material, and
A frame rotation means for rotating and displacing the frame about a rotation axis provided on a return direction side of the roll in order to peel off the plate from the printing material in synchronization with the reversing operation of the roll. It is.

[0017] Thus, when the plate is peeled off from the substrate, the position where the plate is peeled off can be accurately controlled, and printing deviation can be prevented.

According to a third aspect of the present invention, there is provided a frame lifting means for lifting a free end side of the frame in synchronization with a rotational displacement operation of the frame by the frame rotating means.

Thus, the operation of starting peeling, which requires a large force, can be performed smoothly.

According to a fourth aspect of the present invention, an end of the plate holding sheet on the return side of the roll is fixed to a plate holding sheet rotatably provided with respect to a rotation shaft serving as a rotation center of the frame. It is fixed to a member.

With this arrangement, the plate can be peeled off while being in close contact with the printing material by the roll, so that even a large-sized plate can be accurately transferred.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a printing press according to the present invention comprises a base 3 on a top surface of a base 1 capable of supporting a printing substrate 2 in a smooth state.
Are provided, and a plate unit 4 is provided on the table 3.

The plate unit 4 has a plate holding sheet 5 made of a non-stretchable member made of fiber or metal with little shrinkage, and the plate holding sheet 5 is formed in a rectangular shape. As shown in FIGS. 2 and 3, a plate 6 made of rubber or the like is adhered.

Both ends of the plate holding sheet 5 are fixed between a first chuck 7 on the left side in the figure and a second chuck 8 on the right side in the figure, which are plate holding sheet fixing members.

The first chuck 7 and the second chuck 8 are mounted on a frame 9 which is a main body of the plate unit 4. The frame 9 has one end (the right end in the figure) fixed to the rotating shaft 10, and a pair of vertical bars 9 a, 9 b which are rotationally displaced with the rotation of the rotating shaft 10, and these vertical bars 9 a, 9 b. A first horizontal beam member 9c which is a fixing member for connecting the free end sides (left end portions in the figure) of the rotating shaft 9b to each other;
And a second horizontal rail member 9d which is a hollow movable member rotatably attached to the first horizontal rail 9d.

The first chuck 7 is connected to the first cross member 9c through a pair of air cylinders 11 and 11 having a built-in spring (not shown), and applies tension to the plate holding sheet 5 by the spring. At the same time, the pressures of the air cylinders 11 and 11 are adjusted by a pressure adjusting means (not shown) so that the printing material 18 applied to the plate 6 is transferred to the printing material 2 as shown in FIG. The tension varying means 14 adjusts the tension of the plate holding sheet 5 when the plate 6 is peeled off after the transfer.

On the other hand, the second chuck 8 is fixed to a second horizontal rail member 9d which is a hollow movable member,
It is configured to be able to move freely around 0 as the center of rotation.

The rotating shaft 10 is rotatably held by bearings 15 and 15 disposed on the base 3, and a motor 16 is connected to one end of the rotating shaft 10 as shown in FIG. The frame rotating means 17 for rotating the 9 by 180 degrees is constituted.

A roll 1 for pressing the printing plate 6 against the printing material 2 from the back of the printing plate holding sheet 5 and transferring the printing material 18 applied to the printing plate 6 to the printing material 2 is provided above the table 3.
A gantry 20 having 9 is provided. The gantry 20 is configured to move in the left and right directions in the figure by gantry moving means (not shown).

Further, a frame lifting means 21 is provided to face the free end side of the frame 9 of the base 1. The frame lifting means 21 lifts the free end of the frame 9 in synchronization with the rotational displacement operation of the frame 9 by the frame rotating means 17, and the frame lifting means 21 is shown as an example. And an air cylinder 22 connected to an air supply means.

The operation timings of the tension varying means 14, the gantry moving means (not shown), the frame rotating means 17, and the frame lifting means 21 are controlled by control means (not shown).

The printing operation of the printing press of the present invention having such a configuration is performed according to the procedure shown in FIGS.

First, FIG. 4 shows an initial step in which a plate holding sheet 5 having a plate 6 adhered thereto is attached to a first chuck 7 and a second chuck 8, and a position where a printing material 18 is applied to the plate 6 is shown. Show.

At this time, the air pressure of the air cylinders 11 attached to the first chuck 7 is reduced, and the tensile force is set to be large by the force of the spring built in the air cylinders 11.

Next, as shown in FIG. 5, in a state where the plate unit 4 is rotated and displaced by 180 degrees and moved to the transfer position, the gantry 20 incorporating the roll 19 moves to the transfer start position, that is, the plate 6. Of the roll 19
Descends.

Next, as shown in FIG.
Moves to the left end side of the plate 6, whereby the printing material 18 applied to the plate 6 is transferred to the printing substrate 2.

At this time, since the plate holding sheet 5 is made of a non-stretchable member, distortion of the plate 6 at the time of transfer due to contraction of the plate holding sheet 5 can be prevented, and precise printing can be performed.

After the transfer of the printing material 18, the first
The air pressure of the air cylinders 11 attached to the chuck 7 is set high, and the tensile force of the plate holding sheet 5 decreases. In this state, as shown in FIG. 7, the gantry 20 moves rightward while the roll 19 is lowered, and at the same time, the frame rotating means 17 operates to start the rotational displacement operation of the frame 9. . In other words, the peeling operation of the printing plate 6 from the printing medium 2 is started. At this time, the air cylinder 22 constituting the frame lifting means 21
Operates, and its operating shaft 22a extends to assist in pushing up the frame 9.

As described above, by using the frame lifting means 21, the peeling of the plate 6 requiring a large force can be started smoothly. Also, frame 9
By moving the roll 19 to the right while rotating the roller, the position where the plate 6 is peeled can be accurately controlled, and the transfer can be performed precisely.

When the plate 6 is peeled off, the air cylinders 11 are stretched because the pulling force of the air cylinders 11 is weakened.
It can bend as shown by the angle α in FIG. 7, and the peeling operation is performed accurately.

Further, since the plate holding sheet 5 is made of a non-stretchable member, the portions that extend when peeled off are the air cylinders 11 with reduced tension, so that the end of the plate 6 moves. The transfer result is not distorted.

Further, since the second chuck 8 is rotatable with respect to the rotating shaft 10 of the frame 9, the plate 6 can be peeled off even at the end of the roll 19 in the return direction while keeping the plate 6 in close contact with the printing material 2. This is also a factor that enables precise transfer.

Thus, in the printing press of the present invention,
High-precision printing becomes possible.

Then, as described above, the roll 19 is
When the peeling operation is completed, as shown in FIG.
The second operating shaft 22a contracts, and the roll 19 rises.

Thereafter, the gantry 20 moves to the left, out of the movable displacement area of the plate unit 4, and the plate unit 4 is turned by 180 degrees from the transfer state, as shown in FIG.

Then, the printing object 2 on which printing has been completed is replaced with the next one, and the next printing is performed again.

In the above-described embodiment, the air cylinder 22 is used as a component of the frame lifting means 21. However, the actuator may be expanded and contracted by rotation of a motor or the like.

In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0050]

Since the present invention is configured as described above, the following effects can be obtained.

That is, as described in the first aspect, since the plate holding sheet is made of a non-stretchable member, distortion of the plate at the time of transfer due to contraction of the plate holding sheet can be prevented, and precise printing can be performed. Further, by providing a tension variable means for changing the tension on the plate holding sheet when transferring the printing material to the printing material and when peeling the plate after the transfer of the printing material, the plate holding sheet is lifted up when peeling. The transfer result can be prevented from being distorted due to the movement of the plate edge without being pulled and shifted. For this reason, there is an effect that it can be applied to printing requiring high accuracy.

According to a second aspect of the present invention, the printing material is transferred to the printing substrate by the forward movement of the roll, and the roll is moved backward after the transfer of the printing material. In order to remove the plate from the printing material in synchronization with the operation, frame rotating means for rotating and displacing the frame around a rotation axis provided on the return direction side of the roll is provided, so that the plate is separated from the printing material. When peeling,
The position at which the plate is peeled can be accurately controlled, and printing misalignment can be prevented.

Further, since the frame lifting means for lifting the free end side of the frame is provided in synchronism with the rotational displacement operation of the frame by the frame rotating means, a large force is required. The operation at the beginning of peeling can be performed smoothly.

According to a fourth aspect of the present invention, an end of the plate holding sheet on the return direction side of the roll is fixed to a plate holding sheet rotatably provided with respect to a rotation shaft serving as a center of rotation of the frame. Since it is fixed to the member, it can be peeled off while keeping the plate in close contact with the printing material by the roll,
This has the effect of accurately transferring a large-sized plate.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view schematically showing an example of an embodiment of a printing press according to the present invention.

FIG. 2 is a view of a plate unit, which is a main part, as viewed from a printing surface side.

FIG. 3 is a diagram showing a plate holding sheet and a plate.

FIG. 4 is a diagram showing a state before a printing operation.

FIG. 5 is a diagram showing a state immediately after a printing operation is started.

FIG. 6 is a diagram illustrating a state immediately after a printing operation is completed.

FIG. 7 is a view showing a process of peeling a plate after the printing operation is completed.

FIG. 8 is a diagram showing a state after the end of the plate peeling operation.

FIG. 9 is a view of a conventional plate unit, which is a main part, viewed from a printing surface side.

FIG. 10 is a view showing a conventional printing process using the plate unit shown in FIG.

FIG. 11 is a view showing a process of peeling a plate.

[Explanation of symbols]

 Reference numeral 2: Printed object 3: Stand 4: Plate unit 5: Plate holding sheet 6: Plate 7: First chuck (holding sheet fixing member) 8: Second chuck (holding sheet fixing member) 9: Frame 10: Rotating shaft DESCRIPTION OF SYMBOLS 11 ... Air cylinder 14 ... Tension variable means 17 ... Frame rotation means 18 ... Printing material 19 ... Roll 20 ... Gantry 21 ... Frame lifting means

Claims (4)

[Claims] 1. A printing material is applied to a plate adhered to a plate holding sheet, and the printing material is transferred to the printing material by pressing the plate against the printing material via a roll from the back surface of the plate holding sheet. In the printing press described above, the plate holding sheet is made of a non-stretchable member, and a printing material is transferred to a printing material between the plate holding sheet and a frame for fixing the plate holding sheet. And a tension changing means for changing a tension applied to the plate holding sheet when the plate is peeled off after the transfer of the printing material. 2. The printing press according to claim 1, wherein the printing material is transferred to a printing medium by the forward movement of the roll, and the roll is moved back after the transfer of the printing material. A frame rotating means for rotating and displacing the frame around a rotation axis provided on a return direction side of the roll in order to peel the plate from the printing material in synchronization with the reversing operation is provided. Printing press. 3. The printing press according to claim 2, further comprising frame lifting means for lifting a free end side of said frame in synchronization with a rotational displacement operation of said frame by said frame rotating means. Printing press. 4. The printing press according to claim 2, wherein a return-direction end of the roll of the plate holding sheet is rotatably provided with respect to a rotation shaft serving as a rotation center of the frame. A printing press fixed to a plate holding sheet fixing member.