JP2001080029A - Developing device for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a developing device for a printer capable of effectively preventing an invasion of a treatment liquid to another treating part. SOLUTION: A roller rotating mechanism for rotating a developer supply roller 66, a fixing liquid supply roller 68 and a water supply roller 74 synchronously with each other has a roller gear 121 arranged concentrically with the roller 6, a roller gear arranged coaxially with the roller 68, a roller gear 22 arranged coaxially with the roller 74, a drive gear, three double gear mechanisms 111, 112, 113, and a plurality of drive transmission gears 114. The mechanisms 111, 112, 113 have a first gear 124, a second gear 125, and three coupling members for concentrically coupling the gears 124, 125 at positions other than their axial centers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording an image on a printing plate held on an outer peripheral portion of a plate cylinder, and supplying a processing liquid from a processing liquid supply roller to the printing plate after image recording to record the image. The present invention relates to a developing apparatus in a printing apparatus used in a printing apparatus for performing printing by supplying ink to the printing plate after developing an image surface.

[0002]

2. Description of the Related Art In a conventional general printing apparatus, a printing plate is prepared by bringing a film on which a black and white binary image is recorded into close contact with a printing plate in a plate making process and exposing the printing plate. The printing process was performed after being mounted on the apparatus.

On the other hand, in recent years, there has been proposed a printing apparatus generally referred to as a digital printing machine, which can perform such a plate making process and a printing process with one device.
This digital printing press employs a “computer to plate” system in which an image is formed on a printing plate by directly scanning and exposing the printing plate with a laser beam or the like modulated based on an image signal.

A developing apparatus used in such a printing apparatus is disclosed, for example, in Japanese Patent Laid-Open No.
No. 1-105235. The developing apparatus described in this publication supplies a developing solution to an image surface by bringing a developing solution supply roller into contact with a printing plate.
A fixing liquid is supplied to the image surface by bringing a fixing liquid supply roller into contact with the printing plate, and the image surface on which the image is recorded is developed.

In the development processing apparatus described in this publication, a drive transmission mechanism using a synchronous belt is used because a single drive source is used to rotate the developer supply roller and the fixer supply roller. Has been adopted. However, in order to improve the durability and accuracy of the drive transmission mechanism, a drive transmission mechanism having a configuration in which a developer supply roller, a fixer supply roller, and the like are connected via a plurality of gears may be employed.

[0006]

As described above, in the case of employing a drive transmission mechanism having a structure in which a developer supply roller, a fixer supply roller, and the like are connected via a plurality of gears,
There is a problem that a processing solution such as a developing solution or a fixing solution enters another processing solution portion via a gear. For example, when the fixing solution stored in the fixing tank enters the developing solution tank storing the developing solution from the fixing solution supply roller via a plurality of gears and the developing solution supply roller, the developing solution becomes fatigued and the printing plate becomes fatigued. Processing becomes impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a developing apparatus in a printing apparatus which can effectively prevent a processing liquid from entering another processing section. I do.

[0008]

According to a first aspect of the present invention, an image is recorded on a printing plate held on an outer peripheral portion of a plate cylinder, and a processing liquid is supplied from a processing liquid supply roller to the printing plate after image recording. After supplying and developing the image surface on which the image is recorded,
A development processing apparatus in a printing apparatus that supplies ink to the printing plate to perform printing, wherein a processing liquid supply roller for supplying a processing liquid to the printing plate, and a processing liquid supply roller are coaxially arranged. A roller gear provided, a drive gear connected to a motor, a first gear connected directly to the roller gear or via another gear, and a drive gear connected directly to the drive gear or via another gear. A double gear mechanism comprising: a second gear; and a plurality of connecting members for concentrically connecting the first gear and the second gear at positions other than their axes. .

According to a second aspect of the present invention, an image is recorded on a printing plate held on an outer peripheral portion of a plate cylinder, and a developing solution is supplied from a developing solution supply roller to the printing plate after the image is recorded. A developing device in a printing apparatus for supplying a fixing solution from a roller to develop an image surface on which an image is recorded, and then supplying ink to the printing plate to perform printing. A developer supply roller for supplying
A fixing liquid supply roller for supplying a fixing liquid to the printing plate, a first roller gear disposed concentrically with the developer supply roller, and disposed concentrically with the fixing liquid supply roller. A second roller gear, a drive gear connected to a motor, a first gear connected directly to the first roller gear or via another gear, and a drive gear directly or via another gear to the drive gear. A first double gear mechanism, comprising: a second gear connected by a coupling; and a plurality of connecting members that concentrically couple the first gear and the second gear at positions other than the axis thereof; A third gear connected directly to the second roller gear or via another gear, a fourth gear connected directly to the drive gear via another gear, or the third gear;
And a second double gear mechanism comprising a plurality of connecting members for concentrically connecting the fourth gear and the fourth gear at a position other than the axis thereof.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

First, the configuration of a printing apparatus to which the present invention is applied will be described. FIG. 1 is a schematic side view of a printing apparatus to which the present invention is applied.

This printing apparatus performs image recording and development processing on a printing plate on which an image held on the outer peripheral portion of the plate cylinder 11 is not recorded and makes a plate, and then supplies the ink supplied to the printing plate with Printing is performed by transferring the image onto the printing paper held on the outer peripheral portion of the impression cylinder 19 via the blanket cylinder 12.

The printing apparatus includes a first printing unit 1 and a second printing unit 2 for executing printing with two colors of ink, a paper feeding unit 3 for supplying printing paper to the first printing unit 1, An intermediate transport unit 4 for transporting printing paper from the printing unit 1 to the second printing unit 2, and a second printing unit 2
And a print drive unit 6 that rotates the cylinders of the plate cylinder 11, blanket cylinder 12, impression cylinder 13 and intermediate conveyance unit 4 in synchronization with each other.

First, the configuration of the first printing unit 1 and the second printing unit 2 in the printing apparatus will be described.

The first printing unit 1 has a plate cylinder 11 capable of holding two printing plates on its outer peripheral surface, a blanket cylinder 12 having the same diameter as the plate cylinder 11, a plate cylinder 11 and a blanket cylinder 12 Impression cylinder 19 having half the diameter of
A plate feeding / discharging mechanism 13 for supplying and discharging a printing plate to and from an outer peripheral portion of the plate cylinder 11, and an image recording apparatus for recording an image on two printing plates held on the outer peripheral portion of the plate cylinder 11 14
And a developing device 16 for developing the printing plate after the image is recorded, and two dampening water supplies for individually supplying dampening water to the two printing plates after the developing process. Mechanism 17
And two ink supply mechanisms 15 for individually supplying ink to the two printing plates supplied with dampening solution, and a blanket cylinder cleaning mechanism 18 for cleaning the surface of the blanket cylinder 12 after printing is completed. And

The plate cylinder 11 carries out plate making of this printing plate and printing using this printing plate in a state where two printing plates are held on the outer peripheral portion thereof. The plate cylinder 11 includes a pair of cylinder grooves 21 as shown in FIG.
A plate gripping mechanism 22 for gripping the leading end and the rear end of the printing plate 7 is disposed in each of the body grooves 21.

FIG. 3 is a side view of the plate gripping mechanism 22 disposed in the cylinder groove 21 of the plate cylinder 11, and FIG.
2 is a front view of FIG.

The plate holding mechanism 22 has a plate holding 23 for holding the rear end of the printing plate 7 and a plate holding 24 for holding the leading end of the printing plate 7.

Plate holder 2 for holding the rear end of printing plate 7
3 is a pedestal 25 having a pressing surface 26 formed thereon.
And a claw 27 that can swing about the support shaft 30. The claw 27 is configured to be swingable between a holding position indicated by a solid line and an open position indicated by a two-dot chain line in FIG. The claw 27 is urged toward the open position by the action of a spring (not shown). The four claws 27 are provided in the axial direction of the plate cylinder 11.

A cam shaft 28 is provided between the rear end of the pawl 27 and the pedestal 25. The claw 27 is moved to a holding position indicated by a solid line in FIG. 3 by the action of the cam shaft 28, and the lower surface of the tip and the pressing surface 26 are held at the holding position.
, The rear end of the printing plate 7 is sandwiched. On the other hand, camshaft 2
3, the rear end of the pawl 27 comes into contact with the notch in the camshaft 28, and the pawl 27 moves to the open position by the action of a spring (not shown).

On the other hand, the plate grip 24 for gripping the leading end of the printing plate 7 includes a pedestal 32 having a pressing surface 31 formed above the plate grip 24 and a claw 34 swingable about a support shaft 33. Prepare. The claw 34 is configured to be swingable between a holding position indicated by a solid line and an open position indicated by a two-dot chain line in FIG. The claw 34 is urged toward the open position by the action of a spring (not shown). The nail 34
Also, four are arranged in the axial direction of the plate cylinder 7.

A cam shaft 35 is provided between the rear end of the pawl 34 and the pedestal 32. The claw 34 is moved to a holding position indicated by a solid line in FIG. 3 by the action of the cam shaft 35, and the lower surface of the tip and the pressing surface 31 are held at the holding position.
And the leading end of the printing plate 7 is sandwiched. On the other hand, camshaft 3
When 5 rotates to the position shown by the two-dot chain line in FIG. 3, the rear end of the pawl 34 comes into contact with the notch in the cam shaft 35, and the pawl 34 moves to the open position by the action of a spring (not shown).

On the base 36 of the plate holding mechanism 22,
A plurality of rail members 37 are provided, and
Reference numerals 3 and 24 are slidable on the rail member 37. Also, the pedestals 25 in the plate holders 23 and 24,
32 has projections 38 and 39, respectively, and these projections 38 and 39 are pressed by rail members 41 from the upper surface thereof. Therefore, the plate grip 23 and the plate grip 24 can reciprocate in the left-right direction in FIG. 3 (the direction perpendicular to the plane of FIG. 4).

A fixed block 42 is provided at the center of the base 36. A spring 43 is provided between the fixed block 42 and the pedestal 25, and a spring 44 is provided between the fixed block 42 and the pedestal 32. Also,
Between the pedestal 25 and the side wall of the body groove 21, there is provided a cam shaft 46 having a notch 45 formed in a part thereof, and between the pedestal 32 and the side wall of the body groove 21. A camshaft 48 having a notch 47 formed in part is provided.

For this reason, the cam shafts 46 and 48 are shown in FIG. 3 with the plate grip 23 added to the rear end of the printing plate 7 and the plate grip 24 added to the leading end of the printing plate 7. When rotated from the state, the plate grips 23 and 24 move in directions approaching each other. For this reason, the printing plate 7 can be spread on the outer peripheral portion of the plate cylinder 11.

FIG. 5 is an explanatory view schematically showing a state where the leading end of the printing plate 7 is gripped by the claws 34 of the plate grip 24.

In this figure, reference numeral 8 denotes an image surface (an area where an image is recorded) formed on the printing plate 7. The nail 34 in the plate grip 24 is configured to pinch the printing plate 7 in a non-image area (a region indicated by an arrow a in FIG. 5) between the leading end of the printing plate 7 and the leading end of the image plane 8. I have. Although not shown in this figure,
The claw 27 of the plate grip 23 is configured to hold the printing plate 7 in a non-image area between the rear end of the printing plate 7 and the rear end of the image plane 8.

Referring again to FIG. 1, the blanket cylinder 12 has the same diameter as the plate cylinder 11 described above. A blanket for transferring an ink image on the printing plate 7 is mounted on the outer peripheral surface of the blanket cylinder 12.
The blanket cylinder 12 rotates in synchronization with the plate cylinder 11 by meshing a gear disposed on a side surface of the blanket cylinder 12 with a gear disposed on a side surface of the plate cylinder 11.

The impression cylinder 19 rotates with the printing paper mounted on the outer peripheral surface thereof, and has a half diameter of the plate cylinder 11 and the blanket cylinder 12. On the outer peripheral surface of the impression cylinder 19, a gripper (not shown) for gripping the leading end of the printing paper is provided. The impression cylinder 19 receives a new print sheet from the paper feed cylinder 10 every two rotations,
The printing paper on which printing has been completed is discharged to the discharge cylinder 20 every two rotations.

The plate supply / discharge mechanism 13 supplies the printing plate 7 on which no image is recorded to the plate cylinder 11 and discharges the printing plate 7 used for printing from the plate cylinder 11. A printing plate supply cassette and a printing plate discharge cassette (not shown), and a printing plate transport mechanism (not shown) for transferring the printing plate 7 between the printing plate supply cassette, the printing plate discharge cassette, and the plate cylinder 11 are provided.

The image recording device 14 is for recording images on two printing plates 7 held on the outer peripheral portion of the plate cylinder 11. The image recording device 14 includes a number of LED elements for irradiating the printing plate 7 mounted on the outer peripheral portion of the plate cylinder 11 with a light beam.

The development processing device 16 includes the image recording device 1
4 is for developing the printing plate 7 after the image is recorded. The configuration of the developing device 16 will be described later in detail.

The two dampening water supply mechanisms 17 are provided for the plate cylinder 1.
For the two printing plates 7 held on the outer periphery of No. 1,
It is for supplying dampening solution individually. The dampening water supply mechanism 17 supplies a damping tank for storing dampening water and dampening water stored in the tank to the printing plate 7 held on the outer peripheral portion of the plate cylinder 11. A water supply roller.

The two ink supply mechanisms 15 are provided for the two printing plates 7 supplied with dampening water by the dampening water supply mechanism 17.
, Respectively, for supplying inks of different colors. The ink supply mechanism 15 includes a plurality of ink rollers for supplying the ink stored in the ink storage section and the printing plate 7 held on the outer circumference of the plate cylinder 11 to the ink stored in the ink storage section. And

The blanket cleaning mechanism 18 is for cleaning the surface of the blanket cylinder 12 to which ink has adhered after printing is completed. The blanket cleaning mechanism 18 includes a cleaning cloth for cleaning the blanket in contact with a blanket mounted on the surface of the blanket cylinder 18 and a cleaning liquid supply nozzle for supplying a cleaning liquid to the cleaning cloth.

In the first printing unit 1, an image is recorded by the image recording device 14 and developed by the developing device 16 on the printing plate 7 supplied from the plate supply / discharge mechanism 13 and held on the outer peripheral portion of the plate cylinder 11. And are executed. Then, a printing plate 7 made by plate printing by image recording and development processing.
In contrast, dampening water is supplied from the dampening water supply mechanism 17 and ink is supplied from the ink supply mechanism 15. And
The ink image on the printing plate 7 is transferred via the blanket cylinder 12 onto printing paper mounted on the outer peripheral surface of the impression cylinder 19.

The first printing unit 1 and the second printing unit 2 have the same configuration. Therefore, the second printing unit 2 is assigned the same reference numeral as the first printing unit 1, and a detailed description is omitted.

However, in the first printing unit 1, a printing plate for printing a K (black) image and a printing plate for printing a C (cyan) image on printing paper are provided on the outer periphery of the cylinder 11. The plate is attached. On the other hand, in the second printing unit 2, a printing plate for printing an M (magenta) image and a printing plate for printing a Y (yellow) image on printing paper are provided on the outer peripheral portion of the cylinder 11. Be attached.

Next, the configuration of the printing apparatus other than the first printing unit 1 and the second printing unit 2 will be described.

The above-described paper supply unit 3 is provided with a paper supply table 51 for stacking a large number of print papers, and a print paper loaded on the paper supply table 51 that is separated one by one into a paper supply cylinder 10. And a paper feed mechanism 52 for carrying. The operation of separating and transporting the printing paper by the paper supply unit 3 is performed every two rotations of the paper supply cylinder 10.

The above-mentioned intermediate transport section 4 is for transferring printing paper between the discharge cylinder 20 of the first printing unit 1 and the paper feeding cylinder 10 of the second printing unit 2, and includes a transfer cylinder 53. , 54, 55. Each of these transfer cylinders 53, 54, 55 has twice the diameter of the impression cylinder 19 (the same diameter as the plate cylinder 11 and the blanket cylinder 12). In addition, on the outer peripheral portions of these transfer drums 53, 54, 55, at angular positions separated from each other by 180 degrees,
A gripper for gripping the leading end of the printing paper is provided.

The above-described paper discharge unit 5 is provided with the second printing unit 2.
This is for discharging the printed printing paper discharged from the paper discharge cylinder 20 onto the paper discharge table 56, and grips the endless chain 57 and the leading end of the printing paper attached to the chain 57. And a plurality of grippers (not shown) that travel.

The above-described printing drive unit 6 includes a motor 58 for rotating each cylinder in the printing apparatus in synchronization. The driving force of the motor 58 is transmitted to a pulley 61 by a belt 59, and further transmitted to a paper feed cylinder 10 of the first printing unit 1 via a gear 62 fixed coaxially with the pulley 61.

FIG. 6 is a block diagram showing a main electrical configuration of the printing apparatus.

The printing apparatus includes a control unit 140 including a ROM 141 storing operation programs necessary for controlling the apparatus, a RAM 142 for temporarily storing data and the like during control, and a CPU 143 for executing logical operations. Prepare. The control unit 140 is connected via an interface 144 to a drive circuit 145 that generates a drive signal for each drive unit in the printing apparatus. The printing apparatus is controlled by the control unit 140, and performs a plate making operation and a printing operation including a development process described later.

Further, as will be described later, the control section 140 forms a liquid pool of the developing solution between the surface of the printing plate 7 and the surface of the processing liquid supplying roller 66, so that the developing solution is supplied by a roller rotating mechanism. The roller 66 also functions as a control unit for rotating the roller 66 with the surface thereof being separated from the surface of the printing plate 7 by a minute distance.

Next, plate making and printing operations by the printing apparatus will be described. FIG. 7 is a flowchart showing plate making and printing operations by this printing apparatus.

First, the printing plate 7 is supplied to the outer peripheral portion of each plate cylinder 11 in the first printing unit 1 and the second printing unit 2 (step S1). The printing plate supply operation is performed by the plate supply / discharge mechanism 13.

Next, an image is recorded on the printing plate 7 held on the outer peripheral portion of each plate cylinder 11 (step S2). This image recording operation is performed by irradiating the printing plate 7 mounted on the outer peripheral portion of the plate cylinder 11 with a light beam from the LED element of the image recording device 14.

Next, the printing plate 7 on which the recording of the image has been completed is developed (step S3). This development processing operation is executed by the development processing device 16. The developing operation will be described later in detail.

The printing plate 7 held on the outer periphery of each plate cylinder 11
When the plate making process for the printing plate 7 is completed by performing the above-described image recording and development processing, printing is performed (step S4). In other words, dampening water is supplied from the dampening water supply mechanism 17 and ink is supplied from the ink supply mechanism 15 to the printing plate 7 held on each plate cylinder 11. Then, the ink image on the printing plate 7 is transferred via the blanket cylinder 12 onto the printing paper mounted on the outer peripheral surface of the impression cylinder 19, thereby performing printing.

When the desired printing is completed by continuing the above-described printing operation for a required time, the printing plate 7 used for printing is discharged from each plate cylinder 11 (step S5), and the operation ends.

Next, the configuration of the developing device 16 will be described. FIG. 8 is a schematic side view showing the developing device 16.

The developing unit 16 includes a developing unit 61 for applying a developing solution to the printing plate 7 held on the outer peripheral portion of the plate cylinder 11 and performing a developing process, and a fixing solution for the printing plate 7. A fixing unit 62 for coating and fixing, a squeezing unit 63 for removing the developing solution or the fixing solution from the printing plate 7,
A water supply unit 64 for supplying water to the surface of the plate cylinder 11;

The developing unit 61, the fixing unit 62,
The squeezing section 63 and the water supply section 64 are moved from a developing position (shown by a solid line in FIG. 8) to a lowering position and a pulling-out position (both are indicated by virtual lines in FIG. To the position shown).

In this embodiment, a lithographic printing plate using a silver diffusion transfer method (DTR method) is used as the printing plate 7, and a developer is used as an activator.
The fixer functions as a stabilizer. Further, in this specification, a developing process and a fixing process are collectively referred to as a developing process as necessary.

As shown in FIG. 8, the developing section 61 has a developing tank 65 for storing a developing solution, and a developing solution supply roller 66 whose lower end is immersed in the developing solution stored in the developing tank 65. . The fixing unit 62 includes a fixing tank 67 for storing the fixing liquid, a fixing liquid supply roller 68 whose lower end is immersed in the fixing liquid stored in the fixing tank 67, and a fixing liquid supplied to the fixing liquid supply roller 68. And a shower nozzle 69 for spouting water. The squeezing section 63 includes an squeezing roller 71 and a brush roller 7, the tip of which contacts the squeezing roller 71.
And 2. Further, the water supply section 64 has a water supply roller 74 whose lower end is immersed in the water stored in the water tank 73.
Having.

The developing solution supply roller 66 is for supplying a developing solution to the printing plate 7 held on the outer peripheral portion of the plate cylinder 11, and the fixing solution supplying roller 68 is held on the outer peripheral portion of the plate cylinder 11. This is for supplying a fixing liquid to the printing plate 7.
The squeeze roller 71 is for removing the developing solution or the fixing solution supplied to the printing plate 7, and the brush roller 72 is for cleaning the squeeze roller 71.

Further, the water supply roller 74 supplies water to the surface of the plate cylinder 11 before the printing plate 7 is mounted on the plate cylinder 11, although it has nothing to do with the development processing, the This is for improving the adhesion to the body 11.

The developing solution supply roller 66 and the fixing solution supply roller 68 are arranged in opposite directions with respect to the lower end of the plate cylinder 11. The upper end is located above the lower end of the plate cylinder 11. Both a developer supply roller 66 for supplying the developer from a developer tank 65 for storing the developer and a fixing solution supply roller 68 for supplying the fixer from a fixing tank 67 for storing the fixer are used for the plate. This is because such an arrangement is most effective for arranging the printing plate 7 held on the outer peripheral portion of the cylinder 11 so as to be in contact with the same.

The developing solution supply roller 66, the fixing solution supply roller 68, and the water supply roller 74 are connected to the printing plate 7 held on the outer peripheral portion of the plate cylinder 11 by a roller moving mechanism described later.
Is moved between a processing position close to the printing plate 7 and a retreat position separated from the printing plate 7. Further, the developing solution supply roller 66, the fixing solution supply roller 68, and the water supply roller 74 are configured to rotate in synchronization with each other by a roller rotation mechanism described later.

FIG. 9 is an explanatory diagram showing the relationship between the developing solution supply roller 66 (or the fixing solution supply roller 68) and the printing plate 7 held on the outer peripheral portion of the plate cylinder 11. Since the developer supply roller 66 and the fixer supply roller 88 have the same structure, only the developer supply roller 66 will be described in the following description. In FIG. 9, the plate cylinder 11 itself is not shown.

The developing solution supply roller 66 has a roller body 75 and a shaft 76. A pair of positioning portions 7 as a positioning mechanism are provided at both ends of the roller body 75.
7 are provided. The positioning portion 77 is formed of a cylindrical member having an outer diameter larger than the outer diameter of the roller body 75 provided concentrically with the roller body 75.

For this reason, the developing solution supply roller 66 is
When the printing plate 7 is held in contact with the printing plate 7 held on the outer peripheral portion of the printer 1, the surface of the roller body 75 of the developer supply roller 66 and the surface of the printing plate 7 are arranged at positions separated from each other by a minute distance Y. You. That is, the developer supply roller 6
The step Y shown in FIG. 9 exists between the surface of the roller body 75 and the surface of the printing plate 7 in FIG.

The above-described positioning portion 77 is provided on the surface of the printing plate 7 in a region between the side end of the printing plate 7 and the side end of the image plane 8 (region indicated by an arrow b in FIG. 5). It is configured to abut.

In the developing solution supply roller 66 having the above-described configuration, the roller body 75 and the image surface 8 are opposed to each other at a position separated by the distance Y. The distance Y is determined to be a very small value.
Outside diameter is set. For this reason, the developing solution pumped up from the developing tank 65 by the developing solution supply roller 66 can be supplied to the surface of the printing plate 7 by capillary action.

At this time, since the roller body 75 of the developer supply roller 66 and the image surface 8 of the printing plate 7 are not in direct contact, the image surface 8 is
6, and the silver deposited immediately after the supply of the developing solution is rubbed by the developing solution supply roller 66, so that the anchor silver is continuously deposited. Incompleteness can be effectively prevented.

The minute distance Y is 0.1 mm to
It is preferably about 1.0 mm, and 0.3 mm to
More preferably, it is about 0.6 mm.

Next, the developing solution supply roller 66, the fixing solution supply roller 68, and the water supply roller 74 are moved from the processing position close to the printing plate 7 held on the outer peripheral portion of the plate cylinder 11 to the processing position. The configuration of the roller moving mechanism that moves between the separated escaping position will be described. FIGS. 10 and 11 are schematic diagrams showing the configuration of the roller moving mechanism.

The above-mentioned developer supply roller 66 is provided with an arm 8 which can swing about a shaft 81 provided in the main body of the printing apparatus.
2 rotatably supported. And this arm 8
An arm 84 having a cam follower 83 at its tip is fixed to 2. Further, the tip 87 of the cylinder rod 86 is attached to the cam follower 83 in the printing apparatus main body.
An air cylinder 85 that can be brought into contact with is provided. The arm 82 is urged by a spring (not shown) in a direction in which the developer supply roller 66 approaches the plate cylinder 11.

For this reason, the cylinder rod 86 of the air cylinder 85 shrinks and its tip 87
In a state in which the developer supply roller 66 is separated from the plate cylinder 11, as shown in FIG. 10, the surface of the developer supply roller 66 (more precisely, the surface of the positioning portion 77 provided on the developer supply roller 66) contacts the plate cylinder 11. Move to the processing position that touches. In addition, the cylinder rod 86 of the air cylinder 85 extends and its tip 8
In a state where the cam follower 87 is pressed by the developer 7, as shown in FIG. 11, the surface of the developing solution supply roller 66 (more precisely, the surface of the positioning portion 77 provided on the developing solution supply roller 66) is formed. It moves to a retreat position separated from the plate cylinder 11.

Similarly, the above-mentioned fixing liquid supply roller 68
Is rotatably supported by an arm 92 that can swing about a shaft 91 provided in the printing apparatus main body. An arm 94 having a cam follower 93 at the tip is fixed to the arm 92. In addition, an air cylinder 95 is provided in the printing apparatus main body so that the tip end portion 97 of the cylinder rod 96 can contact the cam follower 93. The arm 92 is urged by a spring (not shown) in a direction in which the fixing liquid supply roller 68 approaches the plate cylinder 11.

For this reason, the cylinder rod 96 of the air cylinder 95 contracts, and its tip 97
In a state where the fixing liquid supply roller 68 is separated from the plate cylinder 11, as shown in FIG. 10, the surface of the fixing liquid supply roller 68 (more precisely, the surface of the positioning portion 77 provided on the fixing liquid supply roller 68) contacts the plate cylinder 11. Move to the processing position that touches. In addition, the cylinder rod 96 of the air cylinder 95 is extended and its tip 9
In a state where the cam 7 is pressed by the cam follower 97, as shown in FIG. 11, the surface of the fixing liquid supply roller 68 (more precisely, the surface of the positioning portion 77 provided on the fixing liquid supply roller 68) is formed. It moves to a retreat position separated from the plate cylinder 11.

Similarly, the water supply roller 74 described above is rotatably supported by an arm 102 that can swing about a shaft 101 provided in the main body of the printing apparatus. An arm 104 having a cam follower 103 at the tip is fixed to the arm 102. In addition, the printing apparatus main body has an air cylinder 105 in which the tip 107 of the cylinder rod 106 can abut on the cam follower 103.
Are arranged. The arm 102 is urged by a spring (not shown) in a direction in which the water supply roller 106 approaches the plate cylinder 11.

For this reason, in a state where the cylinder rod 106 of the air cylinder 105 is contracted and the tip 107 is separated from the cam follower 107, as shown in FIG. Move to the developing position where it comes into contact with. In a state where the cylinder rod 106 of the air cylinder 105 is extended and its tip 107 presses the cam follower 107, as shown in FIG.
Move to the evacuation position away from.

Next, the configuration of a roller rotating mechanism for rotating the developing solution supply roller 66, the fixing solution supply roller 68, and the water supply roller 74 in synchronization with each other will be described.

FIG. 12 is a side view schematically showing a roller rotating mechanism for rotating the developing solution supply roller 66, the fixing solution supply roller 68, and the water supply roller 74 in synchronization with each other.
FIG. 13 shows various gears 111, 112, 113, 114, 115, 121,
FIG. 14 is a side view showing 122 and 123, and FIG. 14 is a plan view thereof. 12 and 13 correspond to FIG. 1 described above.
10 and the side opposite to FIG.

The roller rotation mechanism includes a roller gear 121 disposed concentrically with the developer supply roller 66 and a roller gear 123 disposed concentrically with the fixer supply roller 68.
A roller gear 122 disposed concentrically with the water supply roller 74; and a gear 11 disposed on the drive shaft of the motor 118.
6 and a drive gear 115 connected via a chain 117
And three double gear mechanisms 111, 112, 113, and a plurality of drive transmission gears 114.

As shown in FIG. 15, the double gear mechanism 111 has a first gear 124, a second gear 125, and the first gear 124 and the second gear 125 at positions other than the axis thereof. Three connecting members 126 connected in a core shape
It is composed of The double gear 112 and the double gear 113 have the same structure as the double gear 111.

First gear 12 in double gear mechanism 111
4 is connected via a drive transmission gear 114 to a roller gear 121 arranged concentrically with the developer supply roller 66. The second gear 12 in the double gear mechanism 111
5 is connected to the second gear 125 of the double gear 112 via the drive transmission gear 114.

The first gear 12 in the double gear mechanism 112
4 is connected via a drive transmission gear 114 to a roller gear 122 disposed concentrically with the water supply roller 74. The second gear 125 in the double gear mechanism 112
Is a double gear 113 via three drive transmission gears 114.
And the second gear 125.

First gear 12 in double gear mechanism 113
Reference numeral 4 is connected via a drive transmission gear 114 to a roller gear 123 disposed concentrically with the fixing liquid supply roller 68.

Further, a drive transmission gear 114 connecting the double gear mechanism 112 and the double gear mechanism 113 is connected to a drive gear 115 via another drive transmission gear 114.

In the roller rotating mechanism having the above configuration, the gear 1 provided on the drive shaft of the motor 118
16 and drive gear 11 connected via chain 117
The driving force of No. 5 is transmitted to the roller gears 121, 122, 123 via the plurality of drive transmission gears 114 and the three double gear mechanisms 111, 112, 113. Thus, the developer supply roller 66, the fixer supply roller 68, and the water supply roller 74 rotate in synchronization with each other.

At this time, each double gear mechanism 111, 11
2 and 113 are a first gear 124 and a second gear 12, respectively.
5 and three connecting members 126 for connecting the first gear 124 and the second gear 125 concentrically at positions other than the axis thereof. Therefore, the first gear 12 in each of the double gear mechanisms 111, 112, 113
Even if a liquid such as a developing solution, a fixing solution, or water adheres to the first gear 4, the first gear 124 and the second gear 125 are not connected at their shaft portions, so that the liquid is shaken off by centrifugal force. This prevents the liquid from entering the second gear 125 via the connecting member 126.

Therefore, even when a liquid such as a developing solution, a fixing solution, or water adheres to the first gear 124, the liquid is effectively prevented from reaching other gears via the second gear 125. It becomes possible. For this reason, for example, a problem that the fixing solution enters the developing solution from the fixing solution supply roller 68 via the plurality of gears and the developing solution supply roller 66, and the developing solution becomes fatigued and processing of the printing plate becomes impossible. Etc. can be prevented.

Next, an elevating and lowering mechanism and a moving mechanism for moving the developing device 16 comprising the developing unit 61, the fixing unit 62, the squeezing unit 63 and the water supply unit 64 between the developing position, the lowering position and the drawing-out position. Will be described.
16 to 18 are side views showing the lifting mechanism and the moving mechanism.

FIG. 16 shows a developing section 61, a fixing section 62,
Developing device 1 composed of throttle unit 63 and water supply unit 64
FIG. 17 shows a state in which the developing unit 6 is at the developing position.
1. The state in which the developing device 16 including the fixing unit 62, the squeezing unit 63 and the water supply unit 64 is at the lowered position is
FIG. 18 shows a state in which the developing device 16 including the developing unit 61, the fixing unit 62, the squeezing unit 63, and the water supply unit 64 is at the draw-out position.

As shown in FIGS. 16 to 18, the developing unit 61, the fixing unit 62, the throttle unit 63, and the water supply unit 64
Are supported by a single support 131. The support base 131 is provided with four nut portions 132 (see FIG. 20 described later).
Numeral 2 is screwed with a vertical drive screw 133 in the lifting mechanism.

FIG. 19 is a plan view showing a main part of the elevating mechanism, and FIG. 20 is an enlarged view of a part thereof viewed from the direction of arrow A in FIG.

The vertical drive screw 133 in this lifting mechanism
Are supported by a pair of left and right support plates 134. A worm wheel 136 is fixed to a base end of the vertical driving screw 133. In addition, a pair of left and right support plates 1
A pair of rotation shafts 137 are provided between the pair. The worm wheel 13 is provided at both ends of the rotating shaft 137.
6 are provided, respectively.

At the tips of the pair of rotating shafts 136,
A pulley 139 is provided, and the pulley 139 is
It is connected to a pulley 155 attached to the rotation shaft of the motor 151 via a belt 152. Therefore, the pair of rotating shafts 136 rotate in synchronization with each other by driving of the motor 151. Then, with the rotation of the rotation shaft 136, the four upper and lower drive screws 133 rotate in synchronization with each other.

As described above, each vertical driving screw 133
Is screwed with a nut 132 of a support 131 that supports the developing unit 61, the fixing unit 62, the throttle unit 63, and the water supply unit 64. For this reason, when the vertical drive screw 133 is rotated by the driving of the motor 151, the support 131 is moved to the developing unit 61, the fixing unit 62, the throttle unit 63, and the water supply unit 64.
At the same time, it moves up and down between the developing position shown in FIG. 16 and the descending position shown in FIG.

As shown in FIGS. 16 to 20, each of the left and right support plates 134 has three bearings 153 projecting therefrom. On the other hand, as shown in FIGS.
A guide groove 154 is formed in a pair of left and right side plates 135 of the printing apparatus main body for supporting the plate cylinder 11. The bearing 153 is housed in the guide groove 154, and can run in the guide groove 134.

With such a configuration, the developing unit 61, the fixing unit 62, the squeezing unit 63, and the water supply unit 64, together with the pair of left and right support plates 134, move to the lower position shown in FIG.
Reciprocate between the pull-out positions shown in Fig. In addition, the bearing 153 and the guide groove 154 described above are
A moving mechanism for moving the developing device 16 including the fixing unit 62, the squeezing unit 63, and the water supply unit 64 between the lowered position and the withdrawn position is configured.

In this printing apparatus, the developing unit 6
1, fixing unit 62, throttle unit 63 and water supply unit 64
When moving from the developing position shown in FIG. 6 to the drawing position shown in FIG. 18, first, the developing unit 61, the fixing unit 62, the squeezing unit 63 and the water supply unit 64 are driven by the motor 151 described above.
Is moved to the lowered position shown in FIG. When the operator pulls the handle 156, the developing unit 61,
The fixing unit 62, the squeezing unit 63, and the water supply unit 64 are moved from the lowering position shown in FIG. 17 to the drawing position shown in FIG.

As described above, the developing unit 61, the fixing unit 62, the squeezing unit 63, and the water supplying unit 64 are moved in two steps because the developing solution supply roller 66 and the fixing solution supply roller 68 This is because they are arranged in opposite directions to the lower end, and the upper ends of the developer supply roller 66 and the fixer supply roller 68 are located above the lower end of the plate cylinder 11.

Next, the developing operation performed by the developing device 16 having the above-described configuration will be described. In addition,
The following development processing operation is executed under the control of the control unit 140.

At the start of development immediately after image recording by the image recording device 14 on the printing plate 7 held on the outer peripheral portion of the plate cylinder 11 is started, the developing unit 61, the fixing unit 62,
Developing device 1 composed of throttle unit 63 and water supply unit 64
6 is arranged at the lowered position shown in FIG.

In this state, when developing the printing plate 7 held on the outer peripheral portion of the plate cylinder 11, first, the plate cylinder 11 is rotated at a low speed. Then, the plate cylinder 11 is stopped in a state where the leading end of the printing plate 7 held on the outer peripheral portion is located at a position where the leading end can face the developer supply roller 66. Then, by driving the motor 151 of the lifting mechanism,
Developing unit 61, fixing unit 62, throttle unit 63, and water supply unit 6
The developing device 16 is raised to the developing position, and the developer supply roller 66 is moved from the retracted position to the processing position by driving the air cylinder 85 in the roller moving mechanism. In this state, the developer supply roller 66 and the like are in the state shown in FIG.

In this state, the roller body 75 of the developing solution supply roller 66 shown in FIG. 9 is in the non-image area between the leading end of the printing plate 7 and the leading end of the image plane 8 (arrow in FIG. 5). a), more strictly, at a position facing the non-image area between the claw 34 of the plate grip 24 and the tip of the image surface 8. In this state, as described above, the surface of the roller body 75 of the developer supply roller 66 and the surface of the printing plate 7 are arranged at positions separated from each other by a minute distance Y.

In this state, the developer supply roller 66 is rotated at a high speed for a predetermined time by driving the motor rotation mechanism under the control of the control unit 140. As a result, a sufficient amount of liquid developer is generated between the surface of the roller body 75 and the surface of the printing plate 7 in the developer supply roller 66.

The high-speed rotation time of the developer supply roller 66 at this time is, for example, as shown in FIG.
6, when the step Y between the surface of the roller body 75 and the surface of the printing plate 7 is about 0.3 mm, about 2 to 3 seconds;
When the step Y is about 0.5 mm, it is preferably about 4 to 5 seconds.

The rotation speed of the developer supply roller 66 at this time is, for example, the rotation speed of the developer supply roller 6 during the developing process.
6 is about 1 to 2 rps, 4 to 5 r
It is preferable to be about ps.

Next, after the rotation speed of the developer supply roller 66 is reduced to a normal speed, the plate cylinder 11 is rotated at a low speed clockwise from the state shown in FIG. . With the rotation of the plate cylinder 11, a developing solution is supplied to the surface of the printing plate 7 held on the outer peripheral portion of the plate cylinder 11, and the image surface 8 is developed.

At this time, since the roller body 75 of the developer supply roller 66 and the image surface 8 of the printing plate 7 are not in direct contact, the image surface 8 is
6, the processing unevenness caused by the vibration of the developer supply roller 66 occurs, and the silver deposited immediately after the supply of the developer is rubbed by the developer supply roller 66,
It is possible to effectively prevent the continued precipitation of anchor silver from being incomplete.

The image surface 8 of the printing plate 7 to which the developing solution has been supplied by the developing solution supply roller 66 is continuously
Contact 1 The developer supplied to the surface of the printing plate 7 is squeezed out by the driven rotation of the squeezing roller 71 in contact with the printing plate 7. At this time, the aperture roller 7
1 may be washed by the brush roller 72. At the same time, the jetting of the fixing liquid from the shower nozzle 69 in the fixing section 62 toward the fixing liquid supply roller 68 is started.

In this state, when the plate cylinder 11 further continues to rotate, the printing plate 7 held on the outer peripheral portion of the plate cylinder 11 is rotated.
As shown in FIG. 22, the leading end of the fixing liquid supply roller 6
8 is arranged at a position facing the same. In this state,
As described above, the surface of the roller body 75 of the fixing liquid supply roller 68 and the surface of the printing plate 7 are arranged at positions separated from each other by the minute distance Y. However,
In this state, the printing plate 7 is
Roller body 75 in the surface of the roller and the fixing solution supply roller 68
The surface of the printing plate 7 and the roller body 7 of the fixing solution supply roller 68 are urged by the fixing solution ejected toward the surface of the printing plate 7.
A sufficient amount of the fixing liquid is generated between the surface of the fixing liquid 5 and the surface of the fixing liquid 5.

Then, as the plate cylinder 11 continues to rotate, the fixing liquid is supplied to the surface of the printing plate 7 held on the outer peripheral portion of the plate cylinder 11, and the image surface 8 is fixed.

At this time, since the roller body 75 of the fixing solution supply roller 68 does not directly contact the image surface 8 of the printing plate 7, the image surface 8
8 can effectively prevent processing unevenness due to the vibration of the fixing liquid supply roller 68 caused by the sliding.

When the fixing of the image plane 8 on the printing plate 7 is completed, the developing process for the first printing plate 7 is completed. Then, the developing process of the other printing plate 7 mounted on the outer peripheral portion of the plate cylinder 11 is executed by the same operation as described above.

In this embodiment, even if the fixing solution is left on the printing plate surface, the printing is not affected.
Although the fixing liquid is not squeezed out by the squeezing roller 71, the fixing liquid may be squeezed out by the squeezing roller 71 after the fixing is completed.

Further, as shown in FIG.
2 is disposed at a position facing the shower nozzle 69 in the fixing unit 62 and the fixing liquid supply roller 68 is moved to the above-described retracted position, and the fixing liquid is supplied from the shower nozzle 69. By jetting, the fixing liquid may be supplied directly from the shower nozzle 69 to the squeezing roller 71, and the squeezing roller 71 may be washed with the fixing liquid.

In the above embodiment, each double gear mechanism 111, 112, 113 and each roller gear 121, 1
Although the drive transmission gear 114 is always connected between the drive gears 22 and 123 and the drive gear 115, some of them may be directly connected.

[0115]

According to the first aspect of the present invention, the first gear connected directly or via another gear to the roller gear disposed concentrically with the processing liquid supply roller, and the motor, A second gear connected directly to the connected drive gear or via another gear, and a plurality of connecting members coaxially connecting the first gear and the second gear at a position other than the axis thereof With the provision of the double gear mechanism, the processing liquid can be effectively prevented from entering another processing section.

According to the second aspect of the present invention, the first gear connected directly or via another gear to the first roller gear disposed concentrically with the developer supply roller, and the motor. A second gear connected directly or via another gear to a drive gear connected to the second gear, and a plurality of connections for connecting the first gear and the second gear concentrically at a position other than the axis thereof. A first double gear mechanism comprising a member, a third gear connected directly or via another gear to a second roller gear disposed concentrically with the fixing liquid supply roller, and a motor. A fourth gear connected directly to the connected drive gear or via another gear, and a plurality of connecting members coaxially connecting the third gear and the fourth gear at a position other than the axis thereof And the second double gear mechanism consisting of It becomes possible to effectively prevent from entering the processing section.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing apparatus to which the present invention is applied.

FIG. 2 is a schematic side view of the plate cylinder 11;

FIG. 3 is a side view of the plate gripping mechanism 22;

FIG. 4 is a front view of the plate gripping mechanism 22.

FIG. 5 is an explanatory view schematically showing a state in which the tip of the printing plate 7 is gripped by claws 27;

FIG. 6 is a block diagram illustrating a main electrical configuration of the printing apparatus.

FIG. 7 is a flowchart illustrating plate making and printing operations performed by the printing apparatus.

FIG. 8 is a schematic side view showing the developing device 16;

FIG. 9 is an explanatory diagram showing a relationship between a developer supply roller 66 (or a fixer supply roller 68) and the printing plate 7 held on the outer peripheral portion of the plate cylinder 11.

FIG. 10 is a schematic diagram showing a configuration of a roller moving mechanism.

FIG. 11 is a schematic diagram showing a configuration of a roller moving mechanism.

FIG. 12 is a side view showing an outline of a roller rotation mechanism.

FIG. 13 shows various types of gears 11 included in the roller rotation mechanism.
1, 112, 113, 114, 115, 121, 12
It is a side view which shows 2,123.

FIG. 14 shows various gears 11 included in the roller rotation mechanism.
1, 112, 113, 114, 115, 121, 12
It is a top view which shows 2,123.

FIG. 15 is a perspective view of a double gear mechanism 111, 112, 113.

FIG. 16 is a side view showing a lifting mechanism and a moving mechanism.

FIG. 17 is a side view showing an elevating mechanism and a moving mechanism.

FIG. 18 is a side view showing an elevating mechanism and a moving mechanism.

FIG. 19 is a plan view showing a main part of the lifting mechanism.

20 is an enlarged view of a part of the elevating mechanism as viewed from the direction of arrow A in FIG.

FIG. 21 is an explanatory diagram showing a developing operation.

FIG. 22 is an explanatory diagram illustrating a developing operation.

FIG. 23 is an explanatory diagram illustrating a developing operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st printing unit 2 2nd printing unit 3 paper supply part 4 intermediate conveyance part 5 paper discharge part 6 printing drive part 7 printing plate 8 image surface 10 paper supply cylinder 11 plate cylinder 12 blanket cylinder 13 plate supply / discharge mechanism 14 image recording device REFERENCE SIGNS LIST 15 ink supply mechanism 16 development processing device 17 dampening solution supply mechanism 18 blanket cleaning mechanism 19 impression cylinder 20 paper discharge cylinder 61 developing unit 62 fixing unit 63 throttle unit 64 water supply unit 65 developing tank 66 developer supply roller 67 fixing tank 68 Fixing solution supply roller 69 Shower nozzle 71 Aperture roller 74 Water supply roller 111 Double gear mechanism 112 Double gear mechanism 113 Double gear mechanism 114 Drive transmission gear 115 Drive gear 118 Motor 121 Roller gear 122 Roller gear 123 Roller gear 124 First gear 125 First 2 gear 126 connecting member

Claims (2)

[Claims] An image is recorded on a printing plate held on an outer peripheral portion of a plate cylinder, a processing liquid is supplied from a processing liquid supply roller to the printing plate after image recording, and an image surface on which the image is recorded is developed. A processing liquid supply roller for supplying a processing liquid to the printing plate; and a processing liquid supply roller for supplying a processing liquid to the printing plate, the processing liquid supply roller being concentric with the processing liquid supply roller. A roller gear, a driving gear connected to a motor, a first gear connected directly to the roller gear or via another gear, and a drive gear directly or via another gear. A second gear connected to the first gear and a second gear;
A double gear mechanism comprising a plurality of connecting members for concentrically coupling the gears at positions other than the axis thereof. 2. An image is recorded on a printing plate held on an outer peripheral portion of a plate cylinder, and a developing solution is supplied from a developing solution supply roller and a fixing solution is supplied from a fixing solution supplying roller to the printing plate after image recording. And developing the image surface on which the image is recorded, and then supplying ink to the printing plate to perform printing, the developing device for supplying a developing solution to the printing plate A supply roller, a fixer supply roller for supplying the fixer to the printing plate, a first roller gear disposed concentrically with the developer supply roller, and a concentric arrangement with the fixer supply roller A second gear, a driving gear connected to a motor, a first gear connected to the first roller gear directly or via another gear, and a direct or other gear to the driving gear. Second gear connected via the gear And a first double gear mechanism comprising: a plurality of connecting members for concentrically connecting the first gear and the second gear at positions other than the axis thereof; and directly or indirectly to the second roller gear. A third gear connected via another gear, a fourth gear connected directly to the drive gear or via another gear, and a third gear and a fourth gear connected to the shaft center thereof. And a second double gear mechanism comprising a plurality of connecting members concentrically coupled at positions other than the above.