JP2000131850A - Printing plate printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of airtightness when a negative film is covered with an overlay sheet. SOLUTION: Sponges 250A to 250H are installed on a negative frame arranged on a printing surface plate 20A while facing the peripheral edge part of the overlay sheet 72 for covering the negative film placed on a printing plate P. The peripheral edge part of the overlay sheet overlaid on a negative bar is pressed by the sponges 250A and 250B, and the peripheral edge part of the negative bar is pressed by the sponges 250C, 250D and 250E so as to bring the negative bar into tight contact with the printing surface plate or the printing plate. Besides, a part overlaid on a negative clamp 176 is pressed by the sponge 250F, and the overlaid part with the peripheral edge part of the printing plate P is pressed by the sponges 250G and 250H so as to prevent the deterioration of the airtightness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate printing apparatus for placing an original film on a printing plate and printing an image recorded on the original film onto the printing plate by close contact exposure.

[0002]

2. Description of the Related Art A printing plate for printing an image recorded on an original film such as a negative film (hereinafter referred to as "negative film") on a photosensitive lithographic printing plate (hereinafter referred to as "printing plate") used for newspaper printing or the like. In the printing apparatus, the printing plate is positioned on a printing platen located at a position facing the light source, and a negative film is positioned and positioned on the printing plate, and recorded on the negative film by contact exposure. Print the image on the printing plate.

In such a printing plate printing apparatus, a suction groove is formed so as to face the peripheral portion of the original film protruding from the printing plate, and the printing plate is squeezed by a negative pressure supplied to the suction groove. Adhere the negative film. At this time, the negative film is covered with a transparent overlay sheet so that the negative film is in close contact with the printing plate even in the central portion of the printing plate where negative pressure is hard to rotate.

[0004] By the way, a thin band-shaped auxiliary metal fitting (hereinafter referred to as "negative bar") is attached to a plate material printing apparatus so as to face a non-image portion on the periphery of a negative film, and the negative bar is positioned with respect to the printing platen. By doing so, a method has been proposed in which a negative film is positioned with respect to a printing plate.

[0005] When an overlay sheet is used in such a plate printing apparatus to make a negative film adhere to a printing plate, it is necessary to cover a part of the negative bar to which the negative film is attached with the overlay sheet. As a result, a portion overlapping the negative bar occurs at the peripheral edge portion of the overlay sheet, and the negative pressure easily leaks at the overlapping portion.

When printing an image of a negative film of one page size of a newspaper on a printing plate of two vertical pages of a newspaper, the negative bar overlaps with the printing plate. At this time, if the central portion of the negative bar in the longitudinal direction is not in close contact with the printing plate, negative pressure leakage may occur from this portion, or air may enter between the negative film and the printing plate.

If the negative film leaks from the oversheet or the air that enters through the gap between the negative bar and the printing plate causes a decrease in the adhesion of the negative film to the printing plate, the image of the negative film is printed. There is a problem in that when printing is performed, printing blur occurs and the finished quality of printed matter is impaired.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in consideration of the fact that a document film adhered to a positioning auxiliary metal fitting is covered with an overlay sheet and exposed to close contact with the document film. It is an object of the present invention to provide a printing plate printing apparatus capable of preventing loss of adhesion to a printing plate and printing an image having a high finish quality.

[0009]

The invention according to claim 1 is
When the original film attached to the predetermined position of the thin band-shaped auxiliary metal fitting is placed on the printing plate placed at the predetermined position on the surface plate, the original film is positioned using the auxiliary metal fitting, and the original film is transparent. A printing material printing apparatus that performs image printing by bringing the original film into close contact with the printing plate by covering the original sheet with the overlay sheet, wherein the peripheral sheet of the auxiliary metal fitting and the peripheral edge of the printing plate and the overlay sheet covering the original film are covered. A substantially flat elastic member disposed to face a predetermined range including an overlapping portion with a peripheral edge portion; and the auxiliary metal fittings by pushing down the elastic member toward a peripheral edge portion of the overlay sheet facing the elastic member. And pressing means for bringing the printing plate and the platen into close contact with each other.

According to the present invention, the elastic member is disposed so as to face the peripheral portion of the overlay sheet covering the original film, and the elastic member is pressed against the overlay sheet by the pressing means. Thereby, for example, when the elastic member is opposed to the peripheral portion of the printing plate and the overlapping portion of the overlay sheet, the elastic member is deformed along the step between the printing plate and the platen to convert the overlay sheet to the printing plate. The gap generated by the step between the surface plates is narrowed to prevent the negative pressure from leaking. Further, since the elastic member presses the overlay sheet against the printing plate, it is possible to prevent a decrease in airtightness due to air entering from between the printing plate and the overlay sheet.

Therefore, when the original film placed on the printing plate is covered with the overlay sheet, the overlay sheet and the original film can be brought into close contact with each other, and the original film can be brought into close contact with the printing plate, and the finishing quality can be improved. High-quality images can be printed on a printing plate.

[0012] The invention according to claim 2 is characterized in that the elastic member is disposed so as to face a predetermined position on a peripheral portion of the auxiliary fitting.

According to the present invention, the elastic member is disposed so as to face the peripheral portion of the auxiliary fitting. Thereby, when the auxiliary metal fittings overlap with the printing plate, the auxiliary metal fittings can be brought into close contact with the printing plate, and it is reliably prevented that the original film floats due to air entering from between the auxiliary metal fittings and the printing plate. be able to.

It is preferable that the elastic member provided on the peripheral portion of the auxiliary metal fitting also presses the overlapping portion between the auxiliary metal fitting and the printing plate, whereby the original film can be more securely brought into close contact with the printing plate.

According to a third aspect of the present invention, the elastic member includes a predetermined area including an overlapping portion of a peripheral portion of a film holding plate for holding the other end of the auxiliary film of the original film and a peripheral portion of the overlay sheet. , And is arranged to face.

According to the present invention, in order to facilitate removal of the original film from the surface plate, the end of the original film opposite to the side where the auxiliary metal fitting is attached is formed by a thin band-like film holding metal. At the time of support, an elastic member is provided so as to face the overlapping portion between the film holding fitting and the peripheral edge of the overlay sheet.

Thus, when the film holding fitting is used, it is possible to prevent the film holding fitting from floating on the overlay sheet or impairing the airtightness in the overlay sheet.

As the elastic member used in the present invention, a general elastic body such as natural rubber or resin rubber can be applied, but a sponge or the like which has a small elastic force and can be deformed into an arbitrary shape by a light pressing force. Is more preferred.

The elastic member is disposed not only on the auxiliary metal fittings, the printing plate and the overlapping portion of the peripheral portion of the overlay sheet and these, but also on the platen to cover the original film with the overlay sheet. It is preferable to provide it so as to face all the members that cause a step at the peripheral edge of the.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a printing plate printing apparatus 10 applied to the present embodiment.

This plate printing apparatus 10 has a film loading section 12 provided at the center of the front of a machine frame (not shown).
An original film (for example, a negative film, hereinafter referred to as “negative film N”) is temporarily positioned and loaded on a tray (not shown).

The plate material printing apparatus 10 includes a film loading unit 1
2, a negative film N is sent from the film loading unit 12 to the bonding unit 14, and positioned in the bonding unit 14 based on a positioning index such as a punch hole or a register mark. After that, it is attached to a negative bar 16 used as an auxiliary metal fitting for positioning. The negative film N affixed to the negative bar 16
It is sent to the printing unit 20 via the standby unit 18.

On the other hand, the printing plate P is stacked on a printing plate mounting table (skid) 22 and loaded into a printing plate loading section 24.
It is taken out from the uppermost layer and sent to the printing unit 20, where the printing unit 2
It is placed and positioned on a printing surface plate 20A provided in the inside.

On the printing plate P positioned on the printing platen 20A, the negative film N conveyed together with the negative bar 16 from the standby section 18 to the printing section 20 is positioned and placed on the basis of the negative bar 16. You. By irradiating light from a light source (not shown) in this state, the negative film N
Is printed on the printing plate P. The printing plate P on which the image has been printed is sent to the temporary stacking unit 42. Further, the negative film N for which image printing has been completed is placed in the standby unit 1.
8 and is conveyed above the attaching section 14 and
After being peeled from the sheet, the sheet is stored in a discharge tray.

Plate material printing apparatus 10 applied to the present embodiment
Is a 2L1 that can print images of one page of newspaper vertically.
W-size printing plate P1 (shown by a solid line in FIG. 1) and newspaper 1
Processing of a printing plate P2 of 2L2W size (indicated by a two-dot chain line in FIG. 1), in which images of pages are printed vertically and horizontally or images of one newspaper spread can be printed vertically, can be printed. The printing plates P1 and P2 have a longitudinal direction of a negative film N.
The image is printed on each of the top side and the ground side so as to be in the top and bottom direction of the image recorded in the.

In the following, the direction of the longitudinal direction of the printing plate P with respect to the vertical direction of the negative film N is indicated by an arrow L direction, and the direction of the negative film N and the printing plate P with respect to the width direction is indicated by an arrow W direction. In the plate printing apparatus 10, a negative film N on which an image of one page of a newspaper is recorded, or a negative film N on which an image of one page of a two-page spread (two pages of newspaper) is recorded is used. The negative film N may be a film which is positioned and pasted in advance on a pasting sheet slightly larger than a one-page spread of newspaper.

In the printing plate printing apparatus 10, a single negative film N is used when printing an image on the printing plate P1, but when the image printing is performed on the printing plate P2, the spread 1 is used.
A negative film N of a page size is used, or two negative films N are arranged side by side in the width direction and positioned on the printing plate P2 to simultaneously perform image printing. In the following, newspaper 1 is mainly used.
A negative film N on which images for pages are recorded will be described as an example.

On the other hand, FIGS. 2A and 2B show a negative bar 16 used in the printing plate printing apparatus 10.
FIG. 2A shows a negative bar 16B used for printing an image on the printing plate P2, and FIG. 2B shows a negative bar 16A used for printing an image on the printing plate P1.

The negative bar 16 is formed by a thin strip-shaped negative bar main body 36. The negative bar main body 36 has a plurality of long holes 38 at one end side in the width direction along the longitudinal direction.
Are drilled. The negative film N is a negative bar 1
6 is attached to the end on the ground side, and the long hole 38 faces the non-image portion of the end on the ground side of the negative film N when the negative film N is attached to the negative bar 16. .

An adhesive tape 40 is attached to the negative bar main body 36 so as to cover the slot 38 on the surface opposite to the surface facing the negative film N. By pressing the adhesive tape 40 into the long hole 38 while the negative bar 16 is placed on the negative film N with the long hole 38 facing a predetermined position of the negative film N, the adhesive tape 40 is pressed. Adheres to the negative film N in the long hole 38.

As shown in FIG. 2A, the printing plate P2
When printing the image of the negative film N on the negative film N, the negative film N is arranged and stuck along the longitudinal direction of the negative bar 16B, and as shown in FIG. 2B, the image recorded on the negative film N is printed on the printing plate P1. At the time of baking, a negative film N is attached to one end of the negative bar 16A along the longitudinal direction. For this reason, as shown in FIG.
In the negative bar 16A to which one negative film N is attached, the long hole 38 is formed so as to be deviated to one end side of the negative bar main body 36 in the longitudinal direction.

The negative bar body 36 has the other end in the width direction,
That is, the reinforcing plate 44 is joined to the surface of the side opposite to the elongated hole 38 where the adhesive tape 40 is adhered. This reinforcing plate 44 is used to reduce the wall pressure of the negative bar body 36 (about 0.3 mm).
Thicker (for example, about 3.0 mm thick)
By adsorbing the reinforcing plate 44 with a suction cup or a magnet, the negative bar 16 can be reliably held. The reinforcing plate 44 of the negative bar 16B is connected to the negative bar 1B.
6B is divided so as not to cover the widthwise end of the printing plate P2 when the printing plate P2 is positioned. The reinforcing plate 44 of the negative bar 16A connects the negative bar 16A to the printing plate P1.
The printing plate P1 is divided so as not to cover the edge in the width direction of the printing plate P1 when the printing plate P1 is positioned.

As shown in FIGS. 2 (A) and 2 (B), a pair of pin holes 52, 54 for positioning both ends in the longitudinal direction are formed in the negative bar 16 in pairs. 54
Between the pin holes 5 for temporary positioning of the negative bar 16.
6, 58 are drilled in pairs. In addition, negative bar 16A
A long hole 60 is formed at a predetermined position on one end of the negative bar main body 36 in the longitudinal direction in order to identify the negative bar 16B. By detecting the presence or absence of the elongated hole 60, whether the negative bar 16A for the printing plate P1 is
It is possible to identify whether the negative bar 16B is for two.

FIGS. 3 to 8 show a schematic configuration of the printing section 20 provided in the printing plate printing apparatus 10.

As shown in FIG. 3, a printing plate 20A provided in the printing unit 20 has a positioning pin 62 facing the ground side of the printing plate P in the vertical direction and a printing plate P in the width direction of the printing plate P. Positioning pins 6 provided in pairs facing one end side
4 are respectively provided at predetermined positions so as to be able to appear and disappear.
Further, a long hole 66 is formed in the printing platen 20A on the ground side in the vertical direction of the printing plate P, facing the positioning pin 62,
Opposite to the positioning pins 64, elongated holes 68, 7 are provided at the center of the printing plate P along the width direction and at the other end in the width direction.
0 is drilled. A long hole 66,
Pushers (not shown) that protrude and disappear from 68 and 70 are provided.

In the printing section 20, when the printing plate P is placed, the positioning pins 62 and 64 are made to protrude, and
The printing plate P is positioned by pressing the printing plate P toward the positioning pins 62 and 64 by pushers protruding into the holes 6 and 68 or the slots 66 and 70. In addition, the pusher for positioning the printing plate P1 protrudes and retreats in the long hole 68, and the pusher for positioning the printing plate P2 protrudes and protrudes in the long hole 70.

A printing groove P (not shown) is formed at the center of the printing platen 20A so that the positioned printing plate P
The negative pressure supplied to the suction groove causes the suction groove to be suction-held on the printing platen 20A.

Printing plate P adsorbed and held on printing platen 20
, A negative film N stuck on the negative bar 16 is placed. The printing unit 20 is provided with an overlay sheet 72 described later, and the negative film N placed on the printing plate P is covered with the overlay sheet 72.

The printing platen 20A has a suction groove 74 of a predetermined shape formed around the printing plate P.
, The negative film N and the overlay sheet 72 covering the negative film N are suction-held. Note that the suction groove 74 reaches below the peripheral portion of the printing plate P, thereby supplying a negative pressure near the end surface of the printing plate P to bring the negative film N into close contact along the end surface of the printing plate P. Have to be able to. Also, the suction groove 74
Can be formed in any shape on the printing platen 20A, and a detailed description thereof will be omitted in the present embodiment.

As shown in FIG. 1, the printing platen 20A is moved along the vertical direction of the printing plate P by moving means (not shown).
The printing plate P is positioned while moving to the ground side in the top and bottom direction of the printing plate P, and the negative film N is placed on the ground side in the top and bottom direction of the printing plate P and image printing is performed. And printing is performed on the ground side of the printing plate P in the vertical direction. Thus, the image can be printed on the top side and the ground side of the printing plate P without moving the negative film N sent to the printing unit 20.

As shown in FIG. 4, the printing unit 20 includes
A negative frame 76 is arranged above the printing platen 20A.
The negative frame 76 faces the top side of the printing plate P placed on the printing surface plate 20A when the printing surface plate 20A moves to the ground side, and when the printing surface plate 20A moves to the top side. The printing plate P is opposed to the ground side (not shown).

As shown in FIGS. 5 and 6, the negative frame 7
6 includes two square pipes 78 arranged on both sides along the width direction of the negative film N, and two angles 80, 82 arranged on the top side in the top and bottom directions of the negative film N. It is formed in a rectangular shape larger than the overlay sheet 72 that covers the negative film N.

As shown in FIGS. 4 and 6, the frame 46 of the printing plate printing apparatus 10 above the printing platen 20A is provided with air cylinders 84 on both sides along the vertical direction of the negative film N. The guide shafts 86 arranged in pairs with the respective air cylinders 84 interposed therebetween have bearings 88.
Has been inserted. Rod 84A of air cylinder 84 and guide shaft 8 protruding downward from frame 46
The tip of 6 is connected to the angles 80 and 82 of the negative frame 76. As a result, the negative frame 76 moves up and down horizontally by driving the air cylinder 84.

As shown in FIG. 7, in the negative frame 76,
A bracket 92 to which the air cylinder 90 is attached is fixed to the ground side in the vertical direction. Air cylinder 90
A rod 90A extends downward, and a strip-shaped holding bar 94 is connected to the tip. This holding bar 94
Bearings 96 are attached to both ends in the longitudinal direction, and guide shafts 98 erected in pairs are inserted into the bearings 96 with the printing platen 20A interposed therebetween (see FIG. 3). Accordingly, the holding bar 94 is disposed such that the longitudinal direction is along the width direction of the negative film N, and the vertical movement of the negative frame 76 and the driving of the air cylinder 90 cause the printing platen 20 to move.
It moves up and down above A.

A plurality of magnets 140 for attracting the negative bar 16 to which the negative film N is attached and a plurality of magnets 142 for attracting the overlay sheet 72 are attached to the holding bar 94.

As shown in FIG. 5, the overlay sheet 72 is formed in a transparent rectangular shape, and the holding metal fitting 144 is attached to the ground side of the negative film N along the vertical direction. The holding member 144 includes a substantially L-shaped member main body 144A, and the metal member main body 144A and the holding plate 144 are provided.
The overlay sheet 72 is sandwiched and fixed between B.

A circular hole 146 is formed in the holding member 144 so as to face the magnet 140 for attracting the negative bar 16, and the mounting pin 1 is located at a predetermined position along the longitudinal direction.
48 are protruded. Also, the overlay sheet 72
, A plurality of metal pieces 150 are attached to the top end of the negative film N along the top and bottom direction.

The overlay sheet 72 includes the holding fittings 14.
4 is attracted and held by the magnet 142 of the holding bar 94. At this time, the mounting pin 148 enters a pin hole (not shown) formed in the holding bar 94 and is positioned and held (see FIG. 7).

On the other hand, as shown in FIG.
4, a positioning pin 152 that faces the punch holes 52 and 54 of the negative bar 16 is provided to project downward. An air cylinder 154 is disposed on the holding bar 94 near the positioning pin 152. The air cylinder 154 is attached to a substantially U-shaped bracket 156, and a rod 154A is connected to the holding bar 94. A bearing 158 is provided on the bracket 156, and a guide shaft 160 inserted through the bearing 158 is connected to the holding bar 94.

The bracket 156 has a round hole 15 at its lower end.
6A is drilled, and the lower end where the round hole 156A is drilled extends below the holding bar 94 to form a round hole 15A.
A positioning pin 152 is inserted into 6A (see FIG. 4). The positioning pin 152 projects downward from the round hole 156A when the rod 154A of the air cylinder 154 is extended and the bracket 156 moves upward, and enters the round hole 156A when the rod 154A of the air cylinder 154 is contracted. .

The negative film N is placed on a set / reset table (not shown) and transported from the standby section 16 to a predetermined position on the printing platen 20A. Negative bar 1 is formed by throwing round hole 146 formed in holding bracket 144.
6. When the holding bar 94 is lowered in this state, the negative bar 16 is suction-held by the magnet 140. At this time, the air cylinder 154
By extending 54A, positioning pins 152 are inserted into pin holes 52 and 54 of negative bar 16 and positioned with respect to negative frame 76.

The negative bar 16 has a magnet 140
When the magnetic force of the air cylinder 154 is released, the air cylinder 154 is pushed down by the bracket 156 by contracting the rod 154A, and the positioning pin 152 is pulled out from the pin holes 52 and 54 and detached from the negative frame 76.

As shown in FIG. 8, an air cylinder 164 is attached to the angle 80 via a bracket 162 on the top side of the negative frame 76. Also, angle 80
Is supported between the square pipes 78 of the negative frame 76 in parallel with the angle 80. Bearings 168 are mounted on the support plate 166 in pairs with the air cylinder 164 interposed therebetween, and the guide shaft 170 is inserted through the bearing 168.

An adsorbing plate 172 is disposed below the support plate 166, and a rod 164A of the air cylinder 164 is provided.
The tip of the guide shaft 170 is connected to the suction plate 172. The suction plate 172 has a plurality of metal pieces 1 attached to the top end of the overlay sheet 72.
A magnet 174 is attached to each of the 50.

The top end of the overlay sheet 72 is
When the metal piece 150 is attracted to the magnet 174, the metal piece 150 is held by the attracting plate 172, and
The magnet 174 is lifted and lowered in response to the driving of the magnet, and the holding is released and the printing surface plate 20A is released.
Placed on top.

Further, as shown in FIG.
A negative clamp 17 formed of a strip-shaped metal plate with extremely thin wall thickness is provided at the top end along the top and bottom direction.
6 are provided. The negative clamp 176 has a longitudinal direction arranged along the width direction of the negative film N, and is connected to a lower end of the guide shaft 178 at both ends in the longitudinal direction. The upper end of the guide shaft 178 is inserted into a bearing 182 attached to the bracket 180. An air cylinder 184 is attached to the bracket 180, and a rod 184 of the air cylinder 184 is attached to the bracket 180.
A and the upper end of the guide shaft 178 are connected by a connection bar 186. Thereby, the air cylinder 184
Extends the rod 184A, so that the negative clamp 176 moves up and down.

The bracket 180 is attached to a guide rail 188 attached to the square pipe 78 of the negative frame 76 via a slider 190. An air cylinder 192 is attached to the square pipe 78 of the negative frame 76 via a bracket 194, and a bracket 180 is connected to a rod 192A of the air cylinder 192. Thus, the negative clamp 176 is moved along the vertical direction of the negative film N by driving the air cylinder 192.

On the other hand, as shown in FIG.
A negative clamp holding portion 196 is provided on the suction plate 172 provided on the top side of the device. The negative clamp holding portion 196 has a support plate 198 disposed along the longitudinal direction of the negative clamp 176 connected to and attached to the suction plate 172 at both ends in the longitudinal direction. A plurality of magnets 200 for attracting and holding the clamp 176 are attached.

When the negative film N is conveyed onto the printing platen 20A, the negative clamp 176 releases the air cylinder 192.
Is moved downward below the top end of the negative film N to support the top end of the negative film N. At this time, the negative clamp 1 is driven by driving the air cylinder 184.
The negative film N is held between the support plate 198 and the top end of the negative film N by being lifted and attracted to the magnet 200.

When the negative film N is placed on the printing plate P, it is lowered by driving the air cylinder 184 and is placed on the printing platen 20A.

The negative clamp 176 is extremely thin (for example, approximately thin) so that a negative pressure does not leak between the negative film N and the printing platen 20A when the negative film N is placed on the printing plate P. 0.4 mm).

On the other hand, as shown in FIGS. 4 and 5, the negative frame 76 is provided with a squeezing device 202 for bringing the negative film N into close contact with the printing plate P. As shown in FIG. 5, guide rails 204 are attached to the square pipes 78 of the negative frame 76 on surfaces facing each other. A slider 206 is attached to each guide rail 204, and a bracket 208 is attached to the slider 206 in pairs. Each of the brackets 208 is provided with an air cylinder 210, and a rod 210A of the air cylinder 210 (see FIG. 4)
A side plate 214 is connected to the bracket 208 via a guide member 212 so as to be vertically movable.

The side plates 214 are connected by connecting bars 216, and a squeeze roller 218 is stretched over them. The squeeze roller 218 is rotatably supported on each of the side plates 214 via a bearing 220.

The squeeze roller 218 is
10 moves downward by extending the rod 210 </ b> A, and presses the negative film N toward the printing plate P from above the overlay sheet 72 by the pressing force of the air cylinder 210.

On the other hand, bearings 222 and 224 are attached to the negative frame 76 at both ends of the square pipe 78. A shaft 226 is hung over and supported by the ground-side bearing 222. A pulley 228 is attached to the shaft 226 near the bearing 222, and the top bearing 2
A pulley 230 is supported on each of the shafts 24.
An endless drive belt 232 is wound between the respective pulleys 228 and 230.

The pulley 23 is provided at an intermediate portion of the shaft 226.
4 are attached. A squeeze motor 236 is mounted on the negative frame 76. An endless drive belt is provided between a pulley 238 provided on the rotation shaft of the squeeze motor 236 and a pulley 234 provided on the shaft 226. 240 is wound.

Thus, when the squeeze motor 236 is driven, the drive belt 232 is integrally moved along the vertical direction of the negative film N.

A bracket 208 is attached to each of the drive belts 232 via a connecting member 242. Thus, the bracket 208 is guided by the guide rail 204 by the driving of the squeeze motor 236, and moves in the negative frame 76 along the vertical direction of the negative film N. At this time, the air cylinder 210 is
18, the squeeze roller 2 is pressed down.
18 rotates while pressing the overlay sheet 72. Thus, the air entering between the negative film N and the printing plate P or between the negative film N and the overlay sheet 72 is squeezed out by the squeeze roller 218.

In the printing section 20, when the suction plate 172 is moved upward so as not to interfere with the squeeze roller 218,
The squeeze device 202 is operated. Squeeze device 202
Moves the squeeze roller 218 downward, and then moves the squeeze roller 218 upward when the overlay film 72 is squeezed together with the negative film N from the top side to the top side of the negative film N in the vertical direction. . Thereafter, the supply of the negative pressure to the printing platen 20A is started to suck the overlay sheet 72 together with the negative film N.

At the same time, the squeeze device 202 returns the squeeze roller 218 to the original position on the ground side of the negative film N. When the squeeze roller 218 moves to a position where it does not interfere with the suction plate 172, the suction plate 172 is lowered. Thereafter, when the squeeze roller 218 reaches the original position, and a predetermined suction time elapses, and the negative film N is brought into close contact with the overlay sheet 72 and the printing plate or the printing platen 20A, By operating a light source unit (not shown), the printing plate P is exposed in close contact with the image recorded on the negative film N.

The negative frame 76 includes a plurality of sensors 14.
2, the moving position of the squeeze roller 218 is detected, the air cylinder 210 is driven, and the squeeze roller 218 is moved up and down.

In the negative frame 76, the negative film N and the overlay sheet 72 are squeezed and the printing plate P
In addition, a sponge 250 is provided at a predetermined position as an elastic member for preventing a negative pressure from leaking when being held in close contact with the printing platen 20A.

As shown in FIG. 7, the light-shielding plate 2 is attached to the holding bar 94 facing the ground side of the negative film N in the vertical direction.
52 are attached. An air cylinder 254 is attached to the light shielding plate 252.
Four rods 254A are connected to the holding bar 94.
A block 256 is attached to the light blocking plate 252 with the air cylinder 254 interposed therebetween.
Is inserted into the block 256 so as to be movable in the axial direction.

Sponges 250A and 250B are attached to the lower end of the light shielding plate 252 in a substantially U-shape in plan view. As shown in FIGS. 9 to 12, this sponge 2
50A and 250B are opposed to the peripheral edge of the ground side edge of the overlay sheet 72, and press the air peripheral edge of the overlay sheet 72 by driving the air cylinder 254 to lower the light shielding plate 252. Thus, the overlay sheet 72 is brought into close contact with the negative bar main body 36 of the negative bar 16 to prevent leakage of negative pressure from the peripheral edge of the ground side end of the overlay sheet 72.

Further, as shown in FIG.
4 has a rectangular hole 9 in the center in the width direction along the longitudinal direction.
4A and 94B are formed. In the rectangular hole 94A,
The support plates 260 and 262 are arranged, and the rectangular holes 94B are provided.
A support plate 264 is arranged inside. Support plate 260,
Each of 262 and 264 has a sponge 250 on the lower surface.
C, 250D and 250E are attached.

The holding bar 94 has support plates 260 and 26
2, 264 corresponding to each of the air cylinders 266.
Is attached. Support plates 260, 262, 264
Each correspond to an air cylinder 2
66, and is pushed down by the drive of the air cylinder 266.

As shown in FIGS. 9 to 12, the sponges 250C, 250D and 250E are opposite to the negative film N in the width direction of the negative bar 16 positioned on the negative frame 76 and placed on the printing plate P. End (Negative film N
(The end on the ground side along the top and bottom directions), and opposes a region of a predetermined width including a portion where the reinforcing plate 44 is divided. Therefore, by driving the air cylinder 266, the overlapping portion of the peripheral portion of the printing plate P and the peripheral portion of the negative bar 16 is pressed by the sponges 250 </ b> C, 250 </ b> D, and 250 </ b> E, and the step generated by the divided reinforcing plate 44 is negative. The film N and the overlay sheet 72 are brought into close contact with each other to prevent leakage of negative pressure from this portion.

On the other hand, as shown in FIG. 8, an air cylinder 268 is mounted on a support plate 198 for holding the negative clamp 176 by suction. This air cylinder 268
, A light shielding plate 272 is attached via a bracket 270. When the air cylinder 268 is driven, the light shielding plate 272 moves downward, and a light source (not shown) is moved from the light source (not shown) to the top side along the vertical direction of the negative film N. To prevent light from leaking into Note that a mask plate 274 is attached to the support plate 198. This mask plate 274 has
A notch 274A for printing a color ball or the like formed at the top end of the negative film N on the printing plate P is formed.

Further, air cylinders 276 are attached to the support plate 198 at both ends in the longitudinal direction. Each air cylinder 276 has a sponge 250 on its lower surface.
A support plate 278 to which F is attached is attached.

As shown in FIGS. 9 to 12, the sponge 250F faces the overlapping portion with the negative clamp 176 at the widthwise end of the overlay sheet 72,
The overlapping portion of the overlay sheet 72 and the negative clamp 176 is pressed in a predetermined range by driving the air cylinder 276, and the negative clamp 176 and the overlay sheet 72 are pressed.
To prevent the negative pressure from leaking from the gap between them.

Further, as shown in FIG.
72, a rectangular opening 172A is formed. A support plate 280 is disposed in the openings 172A at both ends and the center along the width direction of the negative film N. In addition, air cylinders 282 are provided on the suction plate 172 so as to correspond to the respective support plates 280. Each support plate 280 is attached to the air cylinder 282.

Sponge 250G is attached to the lower surface of support plate 280 at both ends along the width direction of negative film N, and sponge 250G is attached to the lower surface of support plate 280 at the center.
50H is affixed.

As shown in FIGS. 9 to 12, the sponge 250G is opposed to both ends in the width direction at the periphery of the top end of the overlay sheet 72, and the sponge 250H is It is opposed to the center in the width direction at the periphery of the top end. Thereby, the sponges 250G and 25G are driven by the driving of the air cylinder 282.
0H presses the overlay sheet 72 to bring the top edge of the overlay sheet 72 into close contact with the printing plate P or the printing platen 20A, thereby preventing leakage of negative pressure.

The operation of the present embodiment will be described below.

In the printing plate printing apparatus 10, the printing plate loading unit 24
When the start of the printing process is supported in a state where the printing plate P is loaded in the film loading unit 12 and the negative film N is loaded in the film loading unit 12, the printing plate P is transported to the printing unit 20, and the printing platen is transferred. Place on 20A. In the printing unit 20, the printing plate P is positioned on the printing platen 20 and held by suction, and the printing plate 20A is moved so that the top side of the printing plate P faces the negative frame 76.

On the other hand, in the printing plate printing apparatus, the negative film N is taken out from the film loading unit 12 and transported to the attaching unit 14 in accordance with the processing of the printing plate P, and the negative film N is attached to the negative bar 16. Thereafter, the negative film 16 and the negative film N are transported together through the standby unit 18 onto the printing platen 20A of the printing unit 20, and the negative film 16 is held at a predetermined position. The image recorded on the negative film N is printed on the printing plate P.

In the printing section 20, a negative frame 76 is disposed above the printing platen 20A. The negative bar 16 to which the negative film N is attached is attached to the pin holes 52 and 54 and to the negative frame 76. The positioning pin 152 protruding from the holding bar 94 is inserted to be positioned and held by the magnet 140 by suction.

Further, the negative clamp 176 provided on the negative frame 76 moves downward after moving the lower end of the top side of the negative film N on which the negative bar 16 is stuck on the ground side in the vertical direction, and then moves upward. The magnet 200 is attached and held to the support plate 198 by suction. As a result, the top side and the bottom side of the negative film N in the top and bottom directions are held by the negative frame 76.

Thereafter, the negative film N is moved downward by moving the negative frame 76 downward, moving the holding bar 94 and the negative clamp 176 downward, and releasing the suction of the negative clamp 176 by the magnet 200. At the same time, the negative bar 16 is placed on the printing platen 20A so as to straddle the printing plate P. An overlay sheet 72 is provided on the negative frame 76 so that the magnet 17
4 to release the overlay sheet 72 on the top side, the negative film N
2 covered.

Thereafter, in the printing section 20, the squeezing device 202 provided on the negative frame 76 is operated. The squeeze device 202 operates the air cylinder 210 to press the overlay sheet 72 covering the negative film N with the squeeze roller 218. In addition, squeeze device 2
02 operates the squeeze motor 236 in accordance with the operation of the air cylinder 210, and the printing unit 20 supplies a negative pressure to the suction groove 74 in accordance with the operation of the squeeze device 202.

As a result, the squeeze roller 218 moves from the ground side to the top side of the negative film N while pressing the overlay sheet 72, and moves between the overlay sheet 72 and the negative film N and between the negative film N and the printing plate P. The air that has entered is squeezed out, and the negative film N and the overlay sheet 72 are sucked and held on the printing platen 20A.

On the other hand, in the printing unit 20, when the squeezing is completed, the supply of the negative pressure to the suction groove 74 of the printing surface plate 20A is started while returning the squeezing roller 218 to the original position. Thereby, the negative film N and the overlay sheet 72
Is brought into close contact with the printing plate P or the printing platen 20A, the printing plate P is exposed, and the image recorded on the negative film N is printed on the top side of the printing plate P.

When the image printing on the top side of the printing plate P is completed, the supply of the negative pressure to the suction groove 74 is released, the air cylinder 184 supporting the negative clamp 176 is raised, and the magnets 174 and 200 are moved. Turn on electricity. As a result, the top side of the negative film N and the overlay sheet 72 is lifted from above the printing plate P, and the negative clamp 176 is attracted to the magnet 200 so that the negative film N
Is held between the negative clamp 176 and the support plate 198, and the metal pieces 150 of the overlay sheet 72 are attracted to the magnet 174, so that the overlay sheet 72 is
Is held.

In this state, by raising the negative frame 76, the overlay sheet 72 and the negative film N are lifted from above the printing plate P. The squeeze device 20
When the image printing is completed, the squeeze roller 218 returns to the original position on the ground side of the negative film N at a predetermined timing.

When the negative film N is lifted from above the printing plate P in this way, the printing unit 20
A is moved to the top side so that the negative frame 76 faces the ground side of the printing plate P. Thereafter, the negative film N is placed on the printing plate P, and image printing on the ground side of the printing plate P is performed.

When the printing on the printing plate P is completed on the top side and the ground side in this way, the printing plate P is taken out of the printing platen 20A and discharged. The negative film N is a printing plate P
When the image printing to the printer is completed, a set / reset table (not shown) is inserted between the printing surface plate 20A and the negative frame 76. Thereafter, the negative clamp 17 by the magnet 200 is used.
6 and the air cylinders 184, 1
The negative clamp 176 is operated by operating the negative film N.
Of the negative bar 16 by the magnet 142 is released. Thus, the negative film N and the negative bar 16 are placed on the set / reset table, and the set / reset table moves to the standby unit 18 so that the negative film N is discharged from the printing unit 20.

The sponge 250 (205A to 250H) is provided on the negative frame 76 so as to face the peripheral edge of the overlay sheet 72 and the peripheral edge of the negative bar.
The air cylinders 254, 266, 276, 282 provided as pressing means in each of 50A to 205H are operated.

As a result, the periphery of the overlay sheet 72 and the periphery of the negative bar 16 straddling the printing plate P are brought into close contact with the printing platen 20A and the printing plate P, and air enters the squeezed overlay sheet 72. In addition, it is possible to prevent the negative pressure supplied to the suction groove 74 from leaking, and to prevent the airtightness from being impaired due to a decrease in the suction force.

That is, as shown in FIG. 9, when printing an image recorded on the negative film N on the top side of the printing plate P1, the negative bar 16 is placed so as to straddle the printing plate P. The overlay sheet 72 covers the negative clamp 176 supporting the top end of the negative film N.
For this reason, an overlapping portion of the negative bar 16 and the negative clamp 176 occurs at the peripheral edge of the overlay sheet 72.

In the printing plate printing apparatus 10, the negative clamp 17
6 and the sponge 2 so as to straddle the negative clamp 176 so as to face the overlapping portion of the peripheral edge of the overlay sheet 72.
50F is provided, and the peripheral portion of the overlay sheet 72 is pressed against the surface of the negative clamp 176 and pressed so as to narrow the gap formed by the step between the negative clamp 176 and the printing platen 20A.

In the plate printing apparatus 10, the negative bar 1
Since the sponges 250 </ b> A and 250 </ b> B are provided along the peripheral portion of the overlay sheet 72 overlapping with 6, the peripheral portion of the overlay sheet 72 is pressed against the negative bar 16.

As a result, it is possible to prevent air from entering from the peripheral edge of the overlay sheet 72 overlapping the negative clamp 176 and the negative bar 16 and also prevent negative pressure from leaking.

Further, in the printing plate printing apparatus 10, the sponge 2 extends along the periphery of the end opposite to the long hole 38 of the negative bar 16.
50C, 250D, and 250E are provided. Sponge 2
The sponge 50D and the sponge 250D face the position where the reinforcing plate 44 of the negative bar 16A used for printing the image on the printing plate P1 is divided.
By pressing the peripheral portion of the negative bar 16A with 0C, the thin-walled negative bar main body 36 is connected to the printing plate P and the printing platen 2.
Since it bends in accordance with the step of 0A and narrows the gap, the airtightness between the negative film N and the printing plate P1 is not impaired by the gap generated between the negative bar 16A and the printing plate P.

On the other hand, as shown in FIG.
When printing the image recorded on the negative film N on the ground side of the printing plate P1, the printing plate P1
The top side of is protruding. For this reason, in particular, a gap is easily generated between the peripheral edge of the printing plate P1 and the peripheral edge of the overlay sheet 72.

In the printing plate printing apparatus 10, sponges 250G and 250H are provided so as to face the overlapping portion between the peripheral portion of the printing plate P1 and the peripheral portion of the overlay sheet 72. Since the sponges 250G and 250H press the overlay sheet 72 in a predetermined range, no gap is generated in the overlapping portion, and the airtightness between the overlay sheet 72 and the printing platen 20A is not impaired. .

Further, as shown in FIG. 11, the printing plate P
When printing the image on the top side of the printing plate P, the negative bar 16B is placed so as to straddle the printing plate P. At this time, sponge 2
50C and 250E are opposed to the negative bar main body 36 of the negative bar 16B which overlaps both ends in the width direction of the printing plate P, and this portion is a portion where the reinforcing plate 44 is divided. By pressing the peripheral portion of the negative bar main body 36 of the negative bar 16B with the sponges 250C and 250E, the negative bar main body 36 is bent in accordance with the step between the printing plate P2 and the printing platen 20A. Further, the sponge 250D presses the negative bar main body 36 on the printing plate P2. Thereby, a gap is not generated between the negative bar 16B and the printing plate P2, and the airtightness of the negative film N is not impaired.

Further, as shown in FIG. 12, when printing an image on the ground side of the printing plate P2, the top side of the printing plate P2 protrudes from the overlay sheet 72. In the printing plate printing apparatus 10, a sponge 250G is provided so as to oppose the overlapping portion between the peripheral edge portions of both sides of the printing plate P1 and the peripheral edge portion of the overlay sheet 72. Is held down. When an image is printed on the printing plate P2, the sponge 250H faces the peripheral portion of the overlay sheet 72 placed at the center in the width direction of the printing plate P. Accordingly, no gap is generated in the overlapping portion between the overlay sheet 72 and the printing plate P2, and the airtightness between the overlay sheet 72 and the printing platen 20A is not impaired.

As described above, in the plate printing apparatus 10 applied to the present embodiment, when the negative film N is brought into close contact with the printing plate P by the overlay sheet 72 covering the negative film N, the peripheral portion of the overlay sheet 72 By providing the sponges 250A to 250H so as to face the overlapping portion of the protruding negative bar 16, the printing plate P, the negative clamp 176, etc. and the peripheral portion of the overlay sheet 72,
In any of the printing plates P1 and P2, the negative film N can be securely brought into close contact with the printing plate P.

The printing plate printing apparatus 10 applied to the present embodiment does not limit the configuration of the present invention. The present invention can be applied to a printing plate printing apparatus of any configuration in which a negative film N positioned by an overlay sheet 72 using any auxiliary metal such as the negative bar 16 is covered with the overlay sheet 72 and is brought into close contact with the printing plate P. it can.

In this embodiment, a sponge is used as the elastic member. However, the present invention is not limited to this, and any elastic material such as natural rubber or resin rubber can be used. At this time, it is preferable that the material be elastically deformed into an arbitrary shape by a light force.

Further, in the present embodiment, a negative film N having a size of one page of newspaper is mainly used as a manuscript film.
The original film is not limited to the negative film N, but may be a positive film. The present invention can be applied to a plate printing apparatus for processing an original film of any size and a printing plate.

[0112]

As described above, according to the present invention, when the original film is covered with the overlay sheet and is brought into close contact with the printing plate, the elastic member is disposed opposite the predetermined peripheral portion of the overlay sheet, By pressing the peripheral portion of the overlay sheet by, without impairing the airtightness between the overlay sheet and the surface plate,
An excellent effect that an image without bokeh can be printed on a printing plate can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a flow of processing of a printing plate and a negative film in a plate printing apparatus applied to the present embodiment.

FIGS. 2A and 2B are schematic perspective views showing a negative bar, wherein FIG. 2A shows a negative bar used for a 2L2W size printing plate, and FIG. 2B shows a negative bar used for a 2L1W size printing plate. ing.

FIG. 3 is a schematic view showing a printing platen provided in a printing section.

FIG. 4 is a schematic configuration diagram of a main part of a printing unit as viewed along a width direction of a negative film.

FIG. 5 is a schematic perspective view showing an overlay sheet and a squeezing device provided on a negative frame.

FIG. 6 is a schematic perspective view showing a lifting mechanism of a negative frame and a negative clamp.

FIG. 7 is a schematic perspective view showing a mechanism for holding an overlay sheet and a negative bar on a negative frame.

FIG. 8 is a schematic perspective view showing a mechanism for holding a negative clamp and a top side of an overlay sheet on a negative frame.

FIG. 9 is a schematic view of a printing platen showing a state in which a negative film N is arranged on a top side of a 2L1W size printing plate.

FIG. 10 is a schematic view of a printing platen showing a state in which a negative film N is arranged on the ground side of a 2L1W size printing plate.

FIG. 11 is a schematic view on a printing platen showing a state in which a negative film N is arranged on a top side of a 2L2W size printing plate.

FIG. 12 is a schematic view of a printing platen showing a state in which a negative film N is arranged on a ground side of a 2L2W size printing plate.

[Description of Signs] 10 Plate material baking device 16, 16A, 16B Negative bar (auxiliary fitting) 20 Baking portion 20A Baking surface plate 72 Overlay sheet 74 Suction groove 76 Negative frame 94 Holding bar 176 Negative clamp (film holding plate) 202 Squeeze device 218 Squeeze roller 250 (250A to 250H) Sponge (elastic member) 252 Light shielding plate 254, 266, 276, 282 Air cylinder (pressing means) 260, 262, 264, 278, 280 Support plate (pressing means) N Negative film (document) Film) P, P1, P2 printing plate

Claims (3)

[Claims] 1. A method of positioning an original film attached to a predetermined position of a thin band-shaped auxiliary metal fitting on a printing plate placed at a predetermined position of a surface plate using the auxiliary metal fitting, A printing plate printing apparatus for printing an image by covering the original film with a transparent overlay sheet and bringing the original film into close contact with a printing plate, and covering the peripheral portion of the auxiliary metal fitting and the peripheral portion of the printing plate with the original film. A substantially flat elastic member disposed opposite to a predetermined range including an overlapping portion with the peripheral edge of the overlay sheet, and an overlay by pushing down the elastic member toward the peripheral edge of the overlay sheet opposed to the elastic member. And a pressing means for bringing the sheet into close contact with the auxiliary metal fitting, the printing plate, and the surface plate. 2. The printing plate printing apparatus according to claim 1, wherein the elastic member is disposed so as to face a predetermined position of a peripheral portion of the auxiliary fitting. 3. The apparatus according to claim 1, wherein the elastic member is disposed so as to face a predetermined area including an overlapping portion of a peripheral portion of a film holding plate that holds the other end of the auxiliary film of the original film and a peripheral portion of the overlay sheet. 3. The printing plate printing apparatus according to claim 1, wherein