JP2000168029A - Offset printing apparatus and method - Google Patents

Abstract

(57) [Abstract] [Problem] To suppress deformation of blanket cylinder due to printing pressure,
Printing can be performed at a constant printing pressure value over the entire printing range. SOLUTION: By relatively moving a blanket cylinder and a printing table, ink filled in a printing plate on the printing table is received by a blanket wound on the blanket cylinder, and the received ink is printed on a printing table. In the offset printing, the blanket cylinder 8 is provided with a support for supporting the blanket cylinder in a direction opposite to the direction of the printing or printing pressure in order to prevent the displacement or deformation of the blanket cylinder during the receiving or transferring. The surface 51 is provided along the outer periphery. Then, during the reception and the transfer, the blanket cylinder is supported on the receiving surface portion 51 by the backup means 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing apparatus and method for transferring and forming an original pattern formed on a printing plate on a printing substrate in a large area with high precision.

[0002]

2. Description of the Related Art As a technique for forming a pattern with high accuracy, a photolithography method is generally used. However, if the pattern formation is performed on a large area, the photolithography method has a problem that the cost increases. on the other hand,
As a pattern forming technique, a method of forming a pattern with high precision over a large area by using a printing technique such as screen printing or offset printing is conceivable. The printing method is suitable for forming a large number of patterns on a substrate, and is more cost-effective than the photolithography method. In particular, the offset printing technique is suitable for forming a thin film pattern.

[0003] A general offset printing apparatus and a printing method for forming an electrode pattern, a color filter and the like in the prior art will be described. FIG.
FIG. 3 is a diagram illustrating an offset printing apparatus that performs an offset printing method in Japanese Patent Publication No. 31499. In the figure,
Reference numeral 101 denotes a plate surface plate for fixing the intaglio plate 102. Also 10
Reference numeral 3 denotes a work surface plate for fixing a work 104 as a printing object, and is fixedly arranged on the stage 105. Stage 105 on which two surface plates arranged in a row are arranged
Is slidable by a ball screw 107 connected to a stage motor 106. On one side of the blanket cylinder 108, a blanket motor 110 is provided via a transmission 109, whereby the blanket cylinder 108 is rotated. The stage motor 106 and the blanket motor 110 for running the stage 105 and rotating the blanket cylinder 108 are synchronously controlled by a control device. Also blanket cylinder 1
08 is supported by a constant pressure device 111 configured to be able to move up and down by an air cylinder. Blanket cylinder 10
When the stage 105 moves backward, the stage 8 moves up and down by the elevating mechanism provided in the constant pressure device 111, so that the stage 8 does not slide on the intaglio 102 and the work 104. Inking is performed by the dispenser device 112, and thereafter, ink filling and scraping are performed by the doctor device 113 disposed on the side of the stage 105 in the traveling direction.
A rubber blanket is wound around the surface of the blanket cylinder 108. Reference numeral 115 denotes an alignment scope, which takes in positional information of the ink pattern printed on the work 104 and aligns the work 104 at a predetermined position by finely adjusting the stage 105 every time the work is replaced.

FIG. 9 is a view showing an offset printing process. In the figure, reference numeral 102 denotes an intaglio and reference numeral 104 denotes a glass substrate serving as a work, which are arranged in series on the same plane. Reference numeral 112 denotes an ink dispenser, which applies ink onto the intaglio 102 (FIG. 102 (a)). 1
13 is a doctor device, which slides on the upper surface of the intaglio 102,
Of the applied ink, the ink other than the ink filled in the intaglio is scraped off (FIG. 102 (b)). Reference numeral 108 denotes a blanket cylinder, which receives the ink filled in the concave portions of the intaglio 102 by sequentially making rotational contact with the intaglio 102 and the upper surface of the glass substrate 104 (FIG. 102 (c)).
The ink is transferred onto the pattern 4 in the pattern of the intaglio 102 (FIG. 102 (d)).

[0005] Thus, the printing process is completed. The printing ink can be appropriately selected depending on the function of the pattern to be produced. That is, the electrode pattern of the recording thermal head or the like is mainly made of an ink containing an organic Au metal called Au resinate paste, and R, G, and B colors for a color filter used in a liquid crystal display device or the like. An ink in which a pigment is dispersed, an ink containing an organic element, or the like is used.

[0006]

However, when a printing pattern is formed over a large area using the above-described offset printing apparatus according to the prior art, the moving table 105 for arranging the plate and the printing medium is moved in the printing direction. Need to be longer. For this reason, it is easily predicted that the traveling accuracy of the moving table 105 is deteriorated as well as the overall length L of the printing apparatus is increased.

In addition, the support height of the blanket cylinder 108 is varied according to the work height in order to make the printing pattern shape high while keeping the printing pressure constant. In order to simultaneously move the left and right supports of the blanket cylinder 108 by the same amount, at least two pulse-controllable motors are arranged on the left and right supports, respectively. A structure for distributing and interlocking the movement of the drive motor to the left and right is required. The play and deformation of the movable portion of the blanket cylinder 108 directly affect the deterioration of the printing position accuracy. Therefore, when applied to a printing apparatus in a printing pressure region of about 1000 kgf, rigidity and accuracy are required for the moving mechanism of the supporting portion. Therefore, it is inevitable that the size of the apparatus itself increases.

Further, as the printing area increases, the overall length of the blanket cylinder 108 increases, and the printing pressure at the time of printing increases the amount of deformation of the blanket cylinder itself supported by the shafts at both ends. There is a problem that the printing pressure varies depending on the location of the work.

An object of the present invention is to provide an offset printing apparatus and method in view of the problems of the prior art.
An object of the present invention is to suppress the deformation of the blanket cylinder due to the printing pressure in large-area printing so that printing can be performed at a fixed printing pressure value over the entire printing range, thereby improving the quality of the printing pattern shape.

[0010]

According to the present invention, there is provided a blanket cylinder rotatably supported, comprising:
On the other hand, there is provided a printing table which is relatively movable at a fixed distance and on which the printing plate and the printing medium are fixed, and the printing on the printing table is performed by relatively moving the blanket cylinder and the printing table. In an offset printing apparatus for receiving an ink filled in a plate on a blanket wound on a blanket cylinder and transferring the received ink to a printing material on a printing table, the blanket cylinder may perform the blanket cylinder during the receiving or transferring. In order to prevent the displacement or deformation of the blanket, a receiving surface portion for supporting the blanket cylinder in a direction opposite to the direction of the plate pressure or the printing pressure is provided along the outer periphery.

[0011] Further, by relatively moving a rotatably supported blanket cylinder and a relatively movable printing table at a certain distance from the blanket cylinder,
In the offset printing method of receiving ink filled in a printing plate on the printing table on a blanket wound on the blanket cylinder and transferring the received ink to a printing material on the printing table, the receiving or transferring is performed. Meanwhile, the blanket cylinder is supported in a direction opposite to the direction of the printing or printing pressure in order to prevent displacement or deformation of the blanket cylinder.

According to this, the receiving surface portion formed on the outer periphery of the blanket cylinder is supported in the direction opposite to the direction of the printing pressure or the printing pressure during reception or transfer, so that the printing pressure in large-area printing is obtained. Alternatively, the deformation and displacement of the blanket cylinder due to the printing pressure are suppressed, and printing is performed at a constant printing pressure value over the entire printing range.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, the printing table has a printing plate and a printing material fixed at the same position, the printing plate is fixed when ink is received, and the printing material is fixed when ink is transferred. It is fixed. According to this, since the travel relating to the printing process of the printing plate and the printing medium is performed by using one printing table, travel under the same conditions with respect to the blanket is realized. Therefore, the relative position accuracy of the print pattern with respect to the original pattern is stabilized and the accuracy is improved.

Further, in order to prevent the blanket cylinder from being displaced or deformed during the receiving and transferring, there is provided backup means for supporting the blanket cylinder on the receiving surface in a direction opposite to the direction of the plate pressure or the printing pressure. The backup means is attached to a member passed between columns supporting both ends of the rotation shaft of the blanket cylinder. That is, it is attached to the portal-type structural member. According to this, when the printing plate or the printing material is pressed against the blanket during printing, the receiving surface portion formed on the outer periphery of the blanket cylinder is printed on the blanket cylinder against displacement or deformation of the blanket cylinder caused by plate pressure or printing pressure generated by pressing. By supporting in the direction opposite to the direction of the printing pressure or printing pressure, the arc section of the blanket where the blanket comes in contact with the printing plate or the printing medium, the rigidity against bending deformation is reduced by the rigidity of the blanket cylinder itself and the portal-type structural member. Is obtained by adding the rigidity of Therefore, the displacement amount is reduced as compared with the case where the blanket cylinder is not supported.

The backup means includes a contact member in contact with the receiving surface portion, a wedge mechanism to which the contact member is attached, and driving the wedge mechanism to contact the contact member with the receiving surface portion and separate the contact member from the receiving surface portion. And a motor. Depending on the magnitude of the printing pressure, the degree of deformation of the blanket cylinder and the gate-shaped structural member varies, and the height position of the receiving surface changes accordingly. The wedge mechanism displaces the contact member so as to follow this. Further, when the blanket cylinder is at a rotational position where the contact member is located at a position other than the receiving surface portion, the contact member is released so as not to contact the blanket.

[0016]

FIG. 1 is a perspective view showing an offset printing apparatus according to one embodiment of the present invention, and FIG. 2 is an enlarged perspective view showing a part thereof. In FIG. 1, reference numeral 1 denotes a main body base to which two linear guides 3 are attached in parallel to the left and right. A moving table 4 is fixed on a moving block of the linear guide 3, and the moving table 4 can move back and forth by a ball screw 6 which is driven to rotate by a drive motor 5 at the rear of the apparatus. Reference numeral 7 denotes a rack gear fixedly attached to the left and right of the upper surface of the moving table 4. 8
Is a cylindrical blanket cylinder, and on the outer periphery of the blanket cylinder 8, a blanket 10 is fixedly arranged with a desired tension given by a blanket tension mechanism. As shown in FIG. 2, in the blanket cylinder 8, a receiving surface 51 is accurately formed on a concentric circle on a circumference facing a portion where the blanket 10 is attached.

Both ends of the blanket cylinder 8 are supported by bearings 12, which are further attached to the main body base 1.
It is fixed by a gate-shaped column 11 rising from the front. The blanket cylinder 8 includes a drive motor 26 and a speed reducer 2.
By the drive of 7, the motor is controlled to be rotatable forward and backward. The drive motor 26 and the speed reducer 27 are fixed to the side surface of the portal 11. Bridge portion 52 of pillar 11 configured as a gate
Is provided with a backup means 53 as shown in FIG. The backup means 53 has a contact member 56 in contact with the receiving surface 51 of the blanket cylinder 8, a wedge mechanism 54 to which the contact member 56 is fixed, and a motor 55 for moving the wedge mechanism 54 up and down. Gears 13 are fixed to both left and right ends of the blanket cylinder 8,
The rack gear 7 can be meshed with each other. The outer dimensions of the plate 16 and the work 18 which are positioned and fixed on the moving table 4 are set to the minimum lengths at which the gear 13 and the rack gear 7 are engaged and move.

As shown in FIG. 3, the traveling of the moving table 4 and the rotation of the blanket cylinder 8 are controlled by a control device 30. However, the contact between the plate and the blanket 10 and the work and the blanket 10 in the printing range is caused by the gear 13.
And the rack gear 7 is engaged.
The engagement between the gear 13 and the rack gear 7 is limited to only the printing range within the entire stroke traveled by the moving table 4, and when the moving table 4 is located at other positions, the blanket cylinder 8 can be freely moved. Rotation control becomes possible.

At the time of this synchronized meshing operation, first, as shown in FIG. 4, the angle of the blanket cylinder 8 is controlled to the meshing initial position, stopped, and made to stand by. The moving table 4 is advanced there, and the front end of the rack gear 7 is
Stop when it reaches the meshing position. This state is the initial state of the engagement. Next, the gear 13 of the blanket cylinder 8 is rotated by the drive motor 26 and the speed reducer 27 in a direction in which the gear 13 is pressed against the advancing surface 31 of the rack gear 7 of the moving table 4 (the direction opposite to the forward direction 32 of the moving table 4), and the displacement amount △ gives θ. Thereafter, the control unit 30 controls and drives the moving table 4 so that the forward movement amount X1 and the rotation movement amount X2 of the blanket cylinder 8 are the same until the end point of the printing range, that is, the end of engagement of the rack gear 7. The control is performed by, for example, semi-closed control that makes the difference between the target movement command value and the rotation amount of the drive motor zero. The backlash generated when the gear 13 meshes with the rack gear 7 due to the pressing of the displacement amount Δθ is prevented. At this time, a change in the drive current value of the drive motor 26 caused by shifting the gear 13 by the amount of Δθ is monitored and controlled so as to fall within a specified range.

Referring back to FIG. 1, reference numeral 20 denotes a plate / work supply area provided at the front end of the traveling table 4 for traveling, and is an area for supplying a plate and a work. An inking doctoring area 21 is provided between the supply area 20 and the blanket cylinder 8. Reference numeral 22 denotes a dispenser that supplies printing ink onto the plate, and reference numeral 23 denotes a doctor that presses and slides a metal thin plate against the plate to fill the printing pattern of the plate with ink. Reference numeral 24 denotes a plate and work discharge area. Every time the printing process of one work is completed, the plate and the work are discharged in the plate / work discharge area 24, and the moving table 4 is returned to the front end of the travel to supply the next plate and the work.

Reference numeral 40 denotes a stage provided on the moving table 4 to which a plate and a work are fixed, and comprises a wedge lower plate 42 and a wedge upper plate 41 thereon. The wedge upper plate 41 is guided so as to be vertically movable, and the height of the wedge upper plate 41 to which the plate and the work are fixed can be adjusted by moving the wedge lower plate 42 back and forth by the drive motor 43. Has become. Reference numeral 19 denotes an abutting member for abutting and positioning the plate and the work when fixing the plate and the work on the moving table 4.

FIG. 5 is a conceptual diagram showing a continuous printing process sequence of the offset printing apparatus. The same reference numerals as those in FIG. 1 indicate the same elements. In this printing process, FIG.
As shown by the broken line in FIG.
Is located in the supply area 20 at the front end of travel, and the wedge lower plate 42 is moved back and forth by the drive motor 43 to move the wedge upper plate 41 up and down, so that the stage 40 is set at the receiving step height. In the supply area 20, the plate 1 is placed on the suction surface on the upper surface of the stage 40.
6 is arranged with reference to the positioning butting member 19 on the moving table 4, and is sucked and fixed. Thereafter, the plate 16 is moved to the inking doctoring area 21, the moving table 4 is stopped at that position, and the ink 25 is supplied onto the plate 16 by the dispenser 22. Next, as shown in FIG. 5A, the doctor 23 is pressed against the upper surface of the plate 16, the moving table 4 is moved forward, and the doctor 23 is slid to fill the original pattern on the plate 16 with ink. At the same time, the ink on the non-master pattern portion is scraped off.

When the inking to the plate 16 and the doctoring are completed, the moving table 4 is moved forward by the driving motor 5 and the ball screw 6, and the moving table 4 is moved.
When the front end of the rack gear 7 on the upper surface reaches a position where it meshes with the gears 13 at both ends of the blanket cylinder 8, the rack gear 7 is stopped. From this position, the blanket cylinder 8 and the moving table 4 are moved to the gear 1
It is controlled by the operation of removing the backlash generated between the gear 3 and the rack gear 7, and the meshing movement is performed. At the same time, FIG.
As shown in (b), in order to suppress the bending deformation of the blanket cylinder 8 caused by the printing pressure, the contact member 5 is pressed so that the receiving surface 51 is pressed by the contact member 56 of the backup means 53.
The height of 6 is controlled by the wedge mechanism 54. This causes the blanket 10 to rotate in contact with the upper surface of the plate 16,
The ink filled in the upper master pattern is received on the surface of the blanket 10. At this time, the pressure applied by the plate 16 to the blanket 10, that is, the plate pressure is determined by the height of the stage 40 set in a wedge structure.
It can be suppressed by 3.

When the movement in the printing range is completed and the movement table 4 moves to the end position of the mesh between the gear 13 and the rack gear 7, the movement table 4 is stopped and the operation control for removing the backlash is released. At the same time, the contact member 56 of the backup means 53 is released by the wedge mechanism 54 so as not to hit the blanket 10. Then, FIG.
As shown in (c), the moving table 4 is advanced to the rear end of the travel, and the plate 16 is removed from the discharge area 24. afterwards,
The moving table 4 is retracted to the front end of travel without sliding on the blanket 10.

Thereafter, when the moving table 4 is located in the supply area 20 at the front end of the running, the wedge lower plate 42 is moved back and forth by the drive motor 43 to move the wedge upper plate 41 up and down, so that the stage 40 is moved to the transfer step. Set to height. In the supply area 20, the new work 18 is arranged on the suction surface on the upper surface of the stage 40 with reference to the positioning butting member 19 on the moving table 4, and is sucked and fixed.

Next, as shown in FIG. 5D, the moving table 4 is advanced by driving the driving motor 5 and the ball screw 6, and the front end of the rack gear 7 on the upper surface of the moving table 4 is moved to the gears at both ends of the blanket cylinder 8. When it reaches the position where it engages with 13, it stops. From this position, the blanket cylinder 8 and the moving table 4 are controlled by the operation of removing the backlash generated between the gear 13 and the rack gear 7 to be engaged and moved. At the same time, in order to suppress the bending deformation of the blanket cylinder 8 caused by the printing pressure, the contact member 5 is pressed so that the receiving surface 51 is pressed by the contact member 56 of the backup means 53.
6 is controlled by the wedge mechanism 54. The work 18 comes into contact with the surface of the blanket 10 sequentially as the work moves. Thus, the ink received on the blanket 10 is transferred to the upper surface of the work 18. As a result, version 1
The original pattern on the upper surface 6 is formed as a print pattern on the work 18 via the blanket 10. During this time,
The pressure applied by the work 18 to the blanket 10, ie, the printing pressure, is determined by the height of the stage 40 set in a wedge structure, and the bending deformation of the blanket cylinder 8 due to this printing pressure is suppressed by the backup means 53.

When the movement of the printing range is completed and the gear 13 and the rack gear 7 are moved to the end position, the moving table 4 is stopped and the operation control for removing backlash is released. At the same time, the contact member 56 of the backup means 53
To the position where it does not hit the blanket 10 by the wedge mechanism 54. Then, as shown in FIG.
The moving table 4 is advanced to the trailing end, the work 18 is removed at the discharge area 24, and the blanket 10 is moved.
It is retracted to the front end of travel without sliding.

Thus, the printing process for one work 18 is completed. Work area is 2 for each printing process
At 0, it is exchanged for a new one. By repeating the above steps, continuous printing is performed. Stage 4 to determine the printing pressure
The height of the stage 40 that determines the height of 0 and the printing pressure is:
Each is set by a drive motor 43 having a wedge structure.
Further, since the outer dimensions of the plate 16 and the work 18 that are arranged and fixed on the stage 40 with the positioning butting member 19 as a reference are the same, the plate 16 and the work 18 are positioned with the positioning butting member 19 as a reference. Printing is performed in a state where the outer shape and position of the contact surface with the blanket 10 are the same.

Hereinafter, the features of this embodiment will be described in detail. As described above, according to this offset printing apparatus,
Since the travel of the printing plate 16 and the work 18 involved in the printing process is shared by one moving table 4, the ink reception and the ink transfer are performed under the same conditions and printing is performed, and the relative positional accuracy of the print pattern is improved. It is possible. In this offset printing apparatus, as shown in FIG. 6, the blanket cylinder 8 has a smooth cylindrical surface 62 that covers the printing area in an area and is accurately configured on a concentric circle with the rotation axis. A blanket 10 is wound around this portion under tension. At least one receiving surface 51 having the same diameter as the smooth cylindrical surface 62 is provided in accordance with the length of the blanket cylinder. The inside of the blanket cylinder 8 has a thick outer shell 6 corresponding to the printing pressure to reduce the weight.
Normally, lightening is performed except for 3 and the cross-sectional shape is substantially C-shaped. The receiving surface 51 is characterized in that it is formed on a partition wall 64 having a disk-shaped cross section in order to function as a rigid member when a printing pressure is applied.

FIG. 7 is a perspective view showing details of the backup means 53 which is a feature of this embodiment. As shown in the figure, a contact member 56 of the backup means 53 is disposed at a position facing the receiving surface 51 of the blanket cylinder 8, and a member holding the contact member 56 is composed of two upper and lower plate-like members having a wedge-shaped cross section. That is, the wedge upper plate 58 and the wedge lower plate 59 have a wedge structure in which the wedge upper plate 58 and the wedge lower plate 59 are overlapped with each other. It is characterized by having. The wedge upper plate 58 is engaged with a ball screw 60 connected to the drive motor 55, and is moved back and forth by, for example, rotation of the pulse-controlled drive motor 55. This movement is converted into a vertical movement of the wedge lower plate 59 at a movement ratio based on the gradient amount setting of the wedge mating surface 57. At this time, the wedge lower plate 59
It is guided up and down without play by the guide post. The control operation of the wedge structure controls the contact state of the contact member 56 with the receiving surface 51 of the blanket cylinder 8 and abuts the contact member 56 so as not to contact the blanket 10 at a rotation position other than the printing process. Member 5
Release 6

The difference from the conventional example shown in FIG. 8 is as follows. In the conventional example, the blanket cylinder 108 is supported at both ends of the shaft. An apparatus structure or the like is provided to enable the support height of the blanket cylinder 108 to be changed accordingly. However, when the work to be printed has a large area, the width of the blanket cylinder 108 becomes large. The bending deformation of the blanket cylinder 108 itself caused by the printing pressure itself is large, and it is difficult to stabilize the printing pressure over the entire large area.

On the other hand, according to the present embodiment, the bridge portion 52 of the gate-shaped column 11 for supporting the blanket cylinder 8 is formed.
Since the backup means 53 attached to the device is a wedge mechanism, high rigidity and delicate control of the pushing amount can be managed. According to such a backup means 53, the rigidity against bending deformation when a printing pressure is applied is a rigidity value obtained by combining the rigidity of the blanket cylinder 8 itself and the rigidity of the portal-type structural member 52, so that when the backup is not performed, The displacement amount can be reduced as compared with that, and therefore, the printing pressure can be made constant in larger area printing.

[0033]

As described above, according to the present invention, the receiving surface portion formed on the outer periphery of the blanket cylinder can be supported in the direction opposite to the direction of the plate pressure or printing pressure during reception or transfer. Therefore, deformation and displacement of the blanket cylinder due to plate pressure or printing pressure can be suppressed, and printing can be performed at a constant printing pressure value over the entire printing range.

Further, by supporting the receiving surface portion by the backup means attached to the portal structure supporting the blanket cylinder, the deformation and displacement of the blanket cylinder reduce the rigidity of the blanket cylinder itself and the rigidity of the portal structure member. This depends on the combined rigidity value, and therefore, the displacement can be reduced as compared with the case where the blanket cylinder is not supported. As a result, there is no change in the printing pressure due to the deformation of the blanket cylinder in large-area printing, and a high-definition pattern can be formed over a large area.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view showing a part of FIG. 1;

FIG. 3 is a schematic diagram showing a configuration for controlling travel of a moving table and rotation of a blanket cylinder in the apparatus of FIG. 1;

FIG. 4 is a diagram showing a meshing state of gears in the apparatus of FIG. 1;

FIG. 5 is a view showing a printing process by the apparatus of FIG. 1;

FIG. 6 is a perspective view showing a structure of a blanket cylinder of the apparatus of FIG.

FIG. 7 is a perspective view showing backup means of the apparatus of FIG. 1;

FIG. 8 is a perspective view showing a conventional offset printing apparatus.

FIG. 9 is a view showing a conventional offset printing process.

[Explanation of symbols]

1: Body base, 4: Moving table, 5: Moving table driving motor, 6: Ball screw, 7: Rack gear, 8:
Blanket cylinder, 10: Blanket, 13: Gear, 1
6: plate, 18: work, 19: positioning butting member, 2
2: dispenser, 23: doctor, 26: blanket cylinder drive motor, 30: control device, 51: receiving surface, 52:
Bridge part, 53: Backup means, 54: Wedge mechanism, 55: Motor, 56: Contact member, 57: Wedge mating surface, 58: Wedge upper plate, 59: Wedge lower plate, 60: Ball screw, 62: Blanket cylinder Smooth cylindrical surface, 63: blanket cylinder outer shell, 64: blanket cylinder partition.

Claims (7)

[Claims] 1. A blanket cylinder rotatably supported, and a printing table, which is relatively movable at a fixed distance from the blanket cylinder, and on which a printing plate and a printing medium are fixed, is provided. By relatively moving the printing table, the ink filled in the printing plate on the printing table is received by the blanket wound on the blanket cylinder, and the received ink is transferred to the printing material on the printing table. In the offset printing apparatus, the blanket cylinder is provided with a support for supporting the blanket cylinder in a direction opposite to a printing pressure or a printing pressure in order to prevent displacement or deformation of the blanket cylinder during the receiving or transferring. An offset printing apparatus comprising a surface portion along an outer periphery. 2. The printing table, wherein the printing plate and the printing material are fixed at the same position, the printing plate is fixed when the ink is received, and the printing material is fixed when the ink is transferred. The offset printing apparatus according to claim 1, wherein the offset printing is performed. 3. A back-up means for supporting the blanket cylinder on the receiving surface in a direction opposite to a printing or printing pressure in order to prevent displacement or deformation of the blanket cylinder during the receiving and transferring. The offset printing apparatus according to claim 1, further comprising: 4. The offset printing apparatus according to claim 3, wherein said backup means is attached to a member passed between columns which support both ends of a rotation shaft of said blanket cylinder. 5. The backup means includes: a contact member in contact with the receiving surface, a wedge mechanism to which the contact member is attached, and driving the wedge mechanism to contact the contact member with the receiving surface and separate the contact member from the receiving surface. The offset printing apparatus according to claim 3, further comprising a motor. 6. A printing plate on the printing table by relatively moving a rotatably supported blanket cylinder and a printing table relatively movable at a certain distance from the blanket cylinder. In the offset printing method of receiving the ink filled in the blanket wound on the blanket cylinder, and transferring the received ink to the printing material on the printing table, during the receiving or transferring, the blanket cylinder, An offset printing method, wherein the blanket cylinder is supported in a direction opposite to a direction of plate pressure or printing pressure in order to prevent displacement or deformation of the blanket cylinder. 7. The offset printing method according to claim 6, wherein the offset printing apparatus according to claim 1 is used.