JP2000098625A - Auxiliary fitting structure for film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain auxiliary fittings for films capable of bringing original films into tight contact with a printing plate without impairing transportability. SOLUTION: Negative films N are stuck to a negative bar via a tacky adhesive tape 40 in the prescribed positions on one end side in the transverse direction of a thin belt-like negative bar body 36. Reinforcing plates 44, 46 of a thick flat plate form are joined to the other end side in the transverse direction of the negative bar body. The reinforcing plate 46 is so formed as to attain a prescribed spacing from the reinforcing plate 44 in the central part in the transverse direction of the printing plate P2 when the negative bar is positioned with respect to the printing plate P2. Then, when the negative bar is placed on the printing plate P2, the negative bar body is curved by a negative pressure and the generation of the spacing near the end face of the printing plate P2 is averted as the reinforcing plate 46 does not extend between the end of the printing plate P2 and a printing surface plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithographic printing plate for printing an image recorded on an original film such as a negative film or a printing plate printing apparatus for printing an image thereon. The present invention relates to an auxiliary film structure for a film used for transporting or positioning a film.

[0002]

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

When printing an image recorded on a negative film on a printing plate, it is necessary to accurately position the negative film with respect to the printing plate. In particular, when performing color printing, higher accuracy is required.

[0004] For this purpose, conventionally, a negative film is accurately positioned and attached to a transparent sheet in which a positioning punch hole is previously formed, or a punch hole is accurately formed at a predetermined position of the negative film. The negative film is punched, and the negative film is positioned with respect to the printing plate by using punch holes formed in the cover sheet and the negative film.

In recent years, a plate material printing apparatus has been proposed in which a negative film is stuck to a printing plate by attaching a negative film to a metal plate formed in a thin band shape and positioning the metal plate with respect to a printing platen. There have been proposals for positioning that can be performed with high accuracy. By using such a metal plate, there is no need to attach a negative film to a sheet having punched holes or to form punched holes in a negative film, and to print an image recorded on the negative film. The baking work on the plate can be simplified.

When a thin band-shaped metal plate is conveyed in a printing plate printing apparatus, there is a method in which the metal plate is attracted by an electromagnet because it is made of metal, in addition to a method in which the metal plate is attracted by a suction cup as in the case of a negative film. However, when a thin metal plate is attracted by a magnet, the attracting force is reduced, so that a large magnetic force is required for stable holding. For this reason, when the metal plate is attracted by the magnetic force, it is preferable to increase the wall pressure.

On the other hand, since the non-image portion of the peripheral edge of the negative film is narrow, when the negative film is placed on the printing plate and positioned, the metal plate is also placed on the printing plate. At this time, if the pressure of the metal plate is small, there is no gap between the metal plate and the end surface of the printing plate because the metal plate curves along the end surface of the printing plate. When the thickness is too thick, a gap is formed between the metal plate and the end face of the printing plate, and a problem arises in that the supplied negative pressure for holding the negative film in close contact with the printing plate escapes from the gap.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and holds an original film in close contact with a printing plate without impairing transportability inside a plate printing apparatus. It is an object of the present invention to propose an auxiliary film structure for a film capable of performing the following.

[0009]

The invention according to claim 1 is
An auxiliary metal body which is formed in a band-like thin shape and has an original film on which an image to be printed on a printing plate recorded thereon is attached along a longitudinal direction to a predetermined position on one end side in the width direction, A thick plate-shaped metal reinforcing plate divided and fixed to a predetermined position along the longitudinal direction on the end side,
It is characterized by including.

According to the present invention, the thick reinforcing plate is joined to the thin auxiliary fitting main body to which the original film is attached. By adsorbing the reinforcing plate by a suction cup or by magnetic force, the main body of the auxiliary fitting to which the original film is attached can be stably and reliably held. Also,
By forming the auxiliary fitting main body to be thin, it is easy to attach the original film.

The invention according to claim 2 is characterized in that the reinforcing plate is divided based on the position of the original film with respect to the auxiliary fitting main body and is joined at predetermined intervals.

Further, the invention according to claim 3 is characterized in that the reinforcing plate is divided and joined based on a relative position to the printing plate when the original film is positioned on the printing plate.

According to the present invention, the reinforcing plate is divided and joined according to the position of the original film to be attached to the auxiliary fitting main body or the position of the printing plate with respect to the auxiliary fitting main body. Thereby, when the original film is positioned on the printing plate,
Even if the auxiliary fitting body is placed on the printing plate, if the thick reinforcing plate is prevented from hitting the periphery of the printing plate, the reinforcing plate can be prevented from forming a gap at the end of the printing plate, The main body of the auxiliary fitting can be brought into close contact with the printing plate or the printing platen together with the original film.

The invention according to claim 4 is characterized in that a positioning hole used for positioning the auxiliary fitting main body is formed at a predetermined position where the reinforcing plate is joined.

According to the present invention, the pin hole for positioning the auxiliary fitting main body is formed in the reinforcing plate. By forming pin holes in the thick reinforcing plate, the durability of the pin holes can be improved, and accurate positioning of the original film can be performed over a long period of time.

Incidentally, the main body of the auxiliary fitting may be formed of metal of the same quality as the reinforcing plate, or may be made of a highly flexible resin or the like.

When the reinforcing plate is attached to the auxiliary fitting main body, a double-sided tape or an adhesive can be used, and if the auxiliary fitting main body and the reinforcing plate are formed of metal,
Spot welding can be used. When spot welding is used, it is preferable to suppress the appearance of welding marks appearing as irregularities on the reinforcing plate or the auxiliary fitting main body.

[0018]

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

The plate printing apparatus 10 has a film loading section 12 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 loaded on a tray (not shown).
In the negative film N, a register mark is recorded as a marker indicating an image area or a punch hole is formed at a predetermined position of a peripheral portion which is a non-image area. Negative film N
Are temporarily positioned and loaded on the tray based on the punch hole when the punch hole is formed and based on the outer periphery when the register mark is recorded.

The plate 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, the film is attached to a negative bar 16 applied as a film auxiliary metal fitting of the present invention. Negative film N affixed to negative bar 16
Is sent to the printing unit 20 via the standby unit 18.

On the other hand, the printing plate P is loaded in a printing plate loading section 24 in a state of being stacked on a printing plate mounting table (skid) 22, taken out from the uppermost layer, sent to the printing section 20, and sent to the printing section 20. It is placed and positioned on a printing platen 20A provided therein.

On the printing plate P positioned on the printing platen 20A, the negative film N transported together with the negative bar 16 from the standby unit 18 to the printing unit 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. When the printing plate P on which the image has been printed is taken out from the printing unit 20, it is sent to the temporary stacking unit 42.

In the printing plate printing apparatus 10, the negative film N whose image printing on the printing plate P is completed is returned from the printing section 20 to the standby section 18, and is transported from the standby section 18 to the upper side of the bonding section 14, where it is bonded. Above the attaching section 14, the sheet is stored in a tray (not shown) for discharge. The negative film N is stored in the standby unit 18.
Is peeled off from the negative bar 16 when transported from above to the pasting portion 14.

The plate printing apparatus 10 applied to the present embodiment is capable of printing images of one page of a newspaper in a vertical direction.
An L1W size printing plate P1 (indicated by a solid line in FIG. 1) and an image for one page of a newspaper are arranged vertically and horizontally and printed or spread on a newspaper 1
Processing of a printing plate P2 of 2L2W size (indicated by a two-dot chain line in FIG. 1), which can print images of pages vertically, can be performed. On the printing plates P1 and P2, images are printed on the top side and the ground side, respectively, such that the longitudinal direction is the top and bottom direction of the image recorded on the negative film N. The printing plate P is mainly conveyed along the width direction. Hereinafter, the direction of the printing plate P in the longitudinal direction (vertical direction) is indicated by an arrow L direction, and the direction of the printing plate P in the width direction is indicated by an arrow W direction.

On the other hand, in the printing plate printing apparatus 10, a negative film N in which an image of one newspaper page is recorded, or a negative film in which an image of one spread page (two newspaper pages) is recorded is used. You. Negative film N on a transparent negative sheet
May be attached in advance. In the following, a negative film N on which an image for one page of a newspaper is recorded will be described as an example.

In the printing plate printing apparatus 10, when printing an image on the printing plate P1, one negative film N is used. When printing an image on the printing plate P2, the two negative films N are moved in the width direction. The images are printed at the same time while being aligned and positioned on the printing plate P2. For this reason, two negative films N are temporarily positioned and loaded on a tray (not shown) of the film loading unit 12, and the two negative films N are integrally transported to the attaching unit 14.

As shown in FIG. 2, the sticking section 14 is provided with a sticking stage 26, and the negative film N is transported from the film loading section 12 and placed on the sticking stage 26. Then, after being positioned on the bonding stage 26 using the register marks or the punch holes, it is suction-held on the bonding stage 42. The positioning of the negative film N using the register marks or punch holes formed in the negative film N can be performed by a conventionally known method. In the present embodiment, only the outline is described, and the detailed description is omitted. I do.

The sticking stage 26 has a fixed surface plate 28 large enough to mount two negative films N side by side. When printing an image on the printing plate P2, two negative films N are placed side by side on the fixed platen 28,
When printing an image on the printing plate P1, the negative film N is placed only on one side of the fixed platen 28 (left side in FIG. 2).

An opening is formed in the fixed platen 28 in the center of the area where the negative film N is placed, and the movable platen 30 is disposed in the opening. The moving platen 30 forms an XY-θ table by a drive mechanism (not shown), and is movable in the vertical direction of the negative film N, in a direction orthogonal to the vertical direction, and in a rotating direction.

On the upper surface of the movable platen 30, suction grooves 32 are provided.
When the negative pressure is supplied to the suction groove 32 while the negative film N is mounted, the negative film N is suction-held on the movable platen 30, and the negative The film N can be relatively moved.

In the attaching section 14, for example, when the negative film N on which a register mark is recorded as an index of positioning is conveyed from the film loading section 12 and placed on the attaching stage 26, the register mark recorded on the negative film N is set. Is read by a sensor (not shown), and on the basis of the read result, the negative film N is suction-held and moved by the moving platen 30.

In the case of a negative film having a punched hole as an index of positioning, a positioning pin (not shown) provided based on the position of the punched hole is protruded from the fixed surface plate 28, and the respective positioning is performed. The pins are inserted into punch holes formed in the negative film N. As a result, the negative film N
Are positioned and mounted.

On the fixed platen 28, a suction groove 34 is formed around the opening where the movable platen 30 is arranged. The negative film N whose positioning has been completed is supplied to the negative groove N supplied to the suction groove 34. It is adsorbed and held on the attaching stage 26 by pressure.

In the printing plate printing apparatus 10, the sticking stage 2
When the negative film N is positioned and held by suction on 6,
This negative film N is attached to the negative bar 16.

FIGS. 3 and 4 show a negative bar 16 to which the present invention is applied. FIG. 3 shows a negative bar 16B used for printing an image on the printing plate P2, and FIG. 4 shows a negative bar 1B used for printing an image on the printing plate P1.
6A is shown. The basic structure of the negative bars 16A and 16B is the same, and in the following description, the negative bar 16 is used unless otherwise specified.

The negative bar 16 is formed by a negative bar main body 36. The negative bar main body 36 is formed in a thin band shape from a metal such as stainless steel, for example.
The length of the negative bar body 36 along the longitudinal direction, that is, the length, is such that both ends protrude from the printing platen 20A when placed on the printing platen 20A.

The negative bar body 36 has a thickness t1 (see FIG. 5A) of about 0.3 mm so as to be easily curved.
Note that the negative bar 16 is repeatedly attached and detached with the negative film N. At this time, since a force is applied to the negative bar main body 36, a spring material (for example, SUS spring or quenched ribbon steel) is used as the negative bar main body 36. It is desirable and more preferable to use them.

As shown in FIGS. 3 and 4, the negative bar main body 36 has long holes 38 at predetermined intervals at one end in the width direction. When the negative film N is attached to the negative bar 16, the long holes 38 are used for the negative film N.
Is opposed to the non-image portion on the periphery. For this reason, as shown in FIG.
In the negative bar 16A to which the negative bar is attached, the long hole 38 is formed so as to be deviated once to the side of the negative bar main body 36 in the longitudinal direction.

An adhesive tape 40 is attached to the negative bar main body 36 on a surface opposite to the surface facing the negative film N, and each of the long holes 38 is covered with the adhesive tape 40. Thereby, the adhesive tape 40 is inserted into the long hole 38 with the long hole 38 facing the predetermined position of the negative film N and the negative bar main body 36 placed on the negative film N.
When the negative tape is pressed inward, the adhesive tape 40 pushed into the long hole 38 because the negative bar main body 36 is formed to be thin, adheres to the negative film N in the long hole 38.

As shown in FIGS. 3 and 4, the negative bar body 36 has a reinforcing plate of the present invention along the longitudinal direction at the other end in the width direction, that is, at the end opposite to the long hole 38. Is pasted.

As shown in FIG. 3, reinforcing plates 44 are attached to both ends in the longitudinal direction of the negative bar 16B, and a reinforcing plate 46 of a predetermined length is attached to the central portion in the longitudinal direction. I have.

The reinforcing plate 46 joined to the center of the negative bar body 36 in the longitudinal direction has a dimension along the longitudinal direction.
It is shorter than the dimension along the width direction of the printing plate P2. Further, the joining position of the reinforcing plate 46 is within a region where the two negative films N are stuck to the negative bar main body 36. Of course, when the negative bar 16B is positioned on the printing platen 20A described later, the printing plate P The central portion along the width direction is set so that the reinforcing plate 46 does not protrude from the peripheral edge of the printing plate P2 in the width direction.

The distance between the reinforcing plate 46 and the reinforcing plate 44 joined to both sides of the reinforcing plate 46 is such that when the negative bar 16B is positioned on the printing platen 20A, the reinforcing plate 44 is also positioned at both ends in the width direction of the printing plate P2. I try not to overlap. In the present embodiment, as an example, when the length X1 of the negative bar body 36 is about 1044 mm, the length X
2, about 787 mm, the distance D1 between the reinforcing plate 44 and the reinforcing plate 46,
D2 is about 54 mm and 63 mm, respectively.

On the other hand, as shown in FIG.
6A, a reinforcing plate 44 is joined to one end in the longitudinal direction, and a reinforcing plate 48 is joined to the other end. Also, the reinforcing plate 44,
48, the reinforcing plate 50 is joined at a position facing the region where the negative film N is attached to the negative bar main body 36.

The dimension of the reinforcing plate 50 along the longitudinal direction is shorter than the dimension along the width direction of the printing plate P1. The position where the reinforcing plate 50 is joined to the negative bar main body 36 is within the area where one negative film N is stuck to the negative bar main body 36. Of course, when the negative bar 16A is positioned on the printing platen 20A described later. , Printing plate P
1 and a reinforcing plate 50
Are arranged so that the peripheral edge of the printing plate P1 in the width direction does not protrude.

The distance between the reinforcing plate 50 and the reinforcing plates 44 and 48 joined to both sides of the reinforcing plate 50 is
When A is positioned on the printing platen 20A, the reinforcing plate 44,
Reference numeral 46 also prevents overlapping with both ends in the width direction of the printing plate P1. In the present embodiment, as an example, the length X3 of the reinforcing plate 50 provided on the negative bar 16A is set to about 377 m.
m, and the distances D3, D4 between the reinforcing plate 50 and the reinforcing plates 44, 48 are about 54 mm and 63 mm, respectively.

As shown in FIG. 5A, the reinforcing plates 44-5
Each of the reference numerals 0 is formed of a metal (for example, stainless steel) of the same material as the negative bar main body 36, and is a flat plate having a thickness t2 of about 3.0 mm so as not to bend or the like. FIG. 5A shows a schematic cross section of a main part of the negative bar 16 along the longitudinal direction.

Each of the reinforcing plates 44 to 50 is joined to the negative bar main body 36 by any of various joining means such as spot welding, adhesion, double-sided tape, and the like.
Thus, the negative bar 16 does not bend at the portion where the reinforcing plates 44 to 50 are joined, but the reinforcing plate 4
In the part where 4 to 50 are not joined, the negative bar body 3
Due to the flexibility of 6, bending and the like are extremely easy.

As shown in FIGS. 3 and 4, the negative bar 16 is provided at predetermined positions at both ends in the longitudinal direction.
A pair of pin holes 52 and 54 are formed for positioning the negative 6, and a pair of pin holes 56 and 58 are formed for provisional positioning when the negative bar 16 is loaded and placed in a temporary placement portion (not shown). I have. These positioning pin holes 52 to 58
Is a region where the reinforcing plates 44 to 50 are joined. That is, the pin holes 52 to 58
Is formed not only through the thin negative bar body 36 but also through the thick reinforcing plate 44 or the reinforcing plate 50.

Thus, the pin holes 52 to 58
When a positioning pin (not shown) is inserted, the negative bar 16 can be accurately positioned.

The negative bar 16A has a negative bar 16A.
A long hole 60 is formed at a predetermined position at one end in the longitudinal direction of the negative bar main body 36 in order to identify the negative B. By detecting the presence or absence of the long hole 60 by a sensor (not shown), it is possible to identify the negative bar 16A and the negative bar 16B,
That is, it is possible to identify whether the negative bar 16A for the printing plate P1 or the negative bar 16B for the printing plate P2.

The outline of the usage of the negative bar 16 to which the present invention is applied in the printing plate printing apparatus 10 will be described below.

As shown in FIG. 2, the adhering section 14 is adjacent to the adhering stage 26,
2 are provided. In the negative bar support portion 62, a long support plate 64 is disposed on the ground side in the vertical direction of the negative film N placed on the attaching stage 26, and the longitudinal direction is arranged along the width direction of the negative film N. . This support plate 64
The rod 66A of the air cylinder 66 is connected to the lower surface (the back side of the paper surface in FIG. 2), and one end of a pair of guide shafts 68 is connected. Have been. The support plate 64 rises in parallel when the air cylinder 66 extends the rod 66A.

On the other hand, positioning pins 70 and 72 are disposed at both ends in the longitudinal direction of the support plate 64 so as to be able to protrude and retract, facing the pin holes 52 and 54 of the negative bar 16. Also,
The support plate 64 has a plurality of magnets 74 embedded at predetermined intervals between the positioning pins 70 and 72.

The negative bar support portion 62 is driven by the air cylinder 66 while energizing the magnet 74 to support the plate 6.
4 is moved upward, and the positioning pins 70 and 72 are made to protrude.
Receive 6. At this time, the pin hole 52 of the negative bar 16
By inserting the positioning pins 70 and 72 into the position 54, the negative bar 16 is positioned with respect to the support plate 64 and is mounted on the support plate 64. When placed on the support plate 64, the negative bar 16 is held by the support plate 64 by the magnetic force of the magnet 74.

Pin hole 5 used for positioning negative bar 16
The formation of the pin holes 52 and 54 over a long period of time can be prevented by forming the thickening plates 44, 46 and 48, instead of the thin negative bar body 36, so that the negative bar 16 can be accurately positioned. Can be positioned.

On the other hand, each of the plurality of magnets 74 faces one of the reinforcing plates 44 to 50 provided on the negative bar 16 positioned with respect to the support plate 64. In 16, the thick reinforcing plates 44 to 50 are attracted to the magnet 74. Thus, the negative bar 16 is securely held on the support plate 64 in a substantially horizontal state with a strong and stable suction force.

The support plate 64 holding the negative bar 16 descends while holding the negative bar 16 in a substantially horizontal state by the air cylinder 66 contracting the rod 66A. As a result, the negative bar 16 is placed on the negative film N without shifting the negative film N or causing wrinkles. Each of the long holes 38 faces a predetermined position of a non-image portion of the negative film N.

The attaching section 14 is provided with an attaching device 76 for attaching the negative film N to the negative bar 16. The attaching device 76 includes a pressing roller 78.
The pressing roller 78 is a crown roller whose outer peripheral portion is formed of an elastic body such as rubber and whose central portion in the width direction has a large diameter. When the negative bar 16 is placed on the negative film N, the attaching device 76 moves the pressing roller 78 over the adhesive tape 40 attached to the negative bar main body 36 by the driving force of a driving unit (not shown) along the longitudinal direction of the negative bar main body 36. To move. At this time,
Since the pressing roller 78 is urged downward, the adhesive tape 4 covering the long hole 38 of the negative bar 16
0 is pushed into the long hole 38 and adheres to the negative film N in the long hole 38. Thereby, the negative film N is adhered to the negative bar 16 via the adhesive tape 40.

The attaching section 14 is provided with a small table 80 adjacent to the attaching stage 26. On the small table 80, a pair of substantially mountain-shaped guides 82 are arranged. Each guide 82 faces a shaft 84 protruding from the axis of the pressing roller 78 moving on the small table 80, and the pressing roller 78 is rotatably attached to the shaft 84. .

As a result, the pressing roller 78 returns to the position on the small table 80, and is held in a state of being lifted from the small table 80 by the shaft 84 being bridged between the guides 82, thereby preventing deformation.

In the plate printing apparatus 10, the attaching stage 2
When the negative film N is attached to the negative bar 16 on 6,
The negative film N and the negative bar 16 are held together and transported to the standby unit 18, and are transported from the standby unit 18 onto the printing platen 20 </ b> A of the printing unit 20.

As shown in FIG. 6, a positioning pin 86 is disposed at a predetermined position on one end side of the printing plate P along the vertical direction of the printing platen 20A so as to be able to protrude and retract.
At one end in the width direction of the printing plate P, a pair of positioning pins 88 are provided so as to be able to protrude and retract along the vertical direction of the printing plate P.

A long hole 90 is formed in the printing platen 20A on the top side in the vertical direction so as to face the positioning pin 86.
Positioning pins 8 are provided at the other end and the center in the width direction.
8, long holes 92 and 94 facing each other are provided in pairs. A pusher pin (not shown) that moves toward the positioning pin 86 or the positioning pin 88 projects from each of the long holes 90, 92, and 94.

In the printing plate printing apparatus 10, when the printing plate P is mounted on the printing platen 20A, the positioning pins 86 and 88 are protruded, and the elongated holes 90 and the elongated holes 90 are formed in accordance with the size of the printing plate P mounted. The printing plate P is pressed toward the positioning pins 86 and 88 by a pusher pin protruding from the hole 92 or the long hole 94. As a result, the printing plate P is moved to the positioning pins 8.
6 and 88, the printing plate P is attached to the printing platen 2
Positioned with respect to 0A.

The printing platen 20A has a suction groove (not shown) formed opposite to the positioned printing plate P, and the printing plate P positioned by the negative pressure supplied to the suction groove.
Is held by suction.

Printing plate P positioned on printing platen 20A
A negative film N is placed on the top together with the negative bar 16. The negative bar 16 to which the negative film N is attached has pin holes 52 and 54 protruding from the printing platen 20A, and is provided above the printing platen 20A so as to face the printing platen 20A (not shown). When the pins projecting from the negative frame enter the pin holes 52 and 54, the negative film 16 and the negative film 16 are formed on the printing platen 20A.
Is positioned. A transparent cover sheet 96 is attached to the negative frame, and the negative film N placed on the printing plate P is covered with the cover sheet 96.

A suction groove 98 is formed on the printing platen 20A so as to surround the printing plate P which is positioned. The suction groove 98 is covered with the negative film N protruding from the peripheral edge of the printing plate P or the cover sheet 96 protruding from the peripheral edge of the negative film N. Negative film N and cover sheet 96
Is sucked and held on the printing platen 20A by the negative pressure supplied to the suction groove 98. In addition, as the suction groove 98,
Negative film N and cover sheet 96 are baked on surface plate 20A.
It can be formed in any shape as long as it can be closely adhered to, and detailed description is omitted in this embodiment.

In the printing unit 20, when the negative film N and the cover sheet 96 are sucked and held, they are inserted between the negative film N and the printing plate P and between the negative film N and the cover sheet 96 by squeezing means (not shown). The air is squeezed out, so that the printing plate P, the negative film N, and the cover sheet can be held in close contact with each other.

Further, the suction groove 98 is extended at a plurality of positions so that the leading end of the suction groove 98 reaches below the peripheral portion of the printing plate P. Thus, when a negative pressure is supplied to the suction groove 98, the printing plate P
The negative pressure supplied to the suction groove 98 wraps around the end face of
The negative film N protruding from the printing plate P is bent along the end surface of the printing plate P due to the negative pressure, and between the printing plate P and the negative film N and between the negative film N and the printing platen 20.
The generation of air bubbles due to the air remaining during A is reliably prevented, so that the negative film N can be securely adhered to the printing plate P and the printing platen 20A.

As shown in FIGS. 7 and 8, a negative frame (not shown) is provided with a negative clamp 99 formed in a thin band shape, and is used when the negative film N is lifted from above the printing plate P. Thus, the top end of the negative film N is held by the negative frame by the negative clamp 99. Further, a plurality of sponges 100 are provided on the negative frame (not shown) so as to oppose the peripheral edge of the cover sheet 96 in order to prevent the peripheral edge of the cover sheet 96 from floating. Is pressed.

As shown in FIGS. 7 and 8, when printing the image recorded on the negative film 16 on the top side of the printing plate P, the negative bar 16 attached to the ground side of the negative film N It is arranged so as to straddle the printing plate P. 7 and 8 show only the schematic arrangement of the printing plate P, the negative bar 16 and the negative film N on the printing platen 20A.

At this time, as shown in FIG. 7, the negative bar 16B used for printing the image on the printing plate P2 is arranged such that the thick reinforcing plate 46 is placed at the center in the width direction of the printing plate P2. Each of the reinforcing plates 44 is mounted on the printing platen 20A. As shown in FIG. 8, a negative plate 16A used for printing an image on the printing plate P1 has a thick reinforcing plate 50 formed of a printing plate P2.
Of the reinforcing plate 4
Each of 4 and 48 is mounted on the printing platen 20A. Therefore, both the printing plates P1 and P2 are in a state where only the thin negative bar main body 36 is straddled between the printing plate 20A and both ends in the width direction.

The negative bar main body 36 is formed to be thin so as to be easily bent. As a result, as shown in FIG. 5B, the negative bar main body 36 is sucked by the negative pressure that wraps around the end surface of the printing plate P. The printing plate P is bent along the end surface. Therefore, it is possible to reliably suppress the occurrence of negative pressure leakage due to the gap generated between the negative bar 16 and the printing plate P and the printing platen 20A. In FIG. 5B,
The schematic cross section of the negative bar 16 and the printing platen 20A along the longitudinal direction of the negative bar 16 is shown.

If the negative film N floats, it appears as a printing defect such as burnout on the printing plate P. However, the negative bar 16 ensures that the negative film N floats due to the negative pressure leakage. Can be suppressed.

That is, the peripheral portion of the printing plate P and the printing platen 2
If the thick portion of the negative bar 16 is straddled during the period of zero, the portion becomes difficult to bend. Therefore, even if a negative pressure flows near the end face of the printing plate P, the negative bar 16 and the printing plate P and the printing platen 2
A wide gap along the width direction of the printing plate P remains between 0A. If the negative pressure supplied to the suction groove 98 leaks from this gap, the suction force on the negative film N is weakened, and the negative film N is likely to float.

As described above, the negative bar 16 is attached to the reinforcing plate 4.
4, 46 or the reinforcing plates 44, 48, and 50, when they are joined to the thin negative bar body 36, the reinforcing plates 44-5
Since 0 does not touch the peripheral edge of the printing plate P, the negative film N can be securely brought into close contact with the printing plate P.

In this embodiment, the reinforcing plates 44 to 5
Although the positioning of the negative bar 16 has been described with the pin holes 52 to 58 formed in the negative plate 0, the pin holes formed in the reinforcing plates 44 to 50 are positioned so as to be positioned with the pin holes 52 to 58 formed in the negative bar main body 36. The through holes corresponding to 52 to 58 may be made larger than the pin holes 52 to 58.

In the present embodiment, the printing plate P is divided so that the reinforcing plate does not cover the position facing the peripheral edge portion. However, the reinforcing plate is provided only at the position where the negative bar 16 is attracted by the suction cup or the magnet. You may do it.

That is, as shown in FIG. 9, the negative bar 16C used as the negative bar 16 is
6, reinforcing plates 44 are joined to both ends along the longitudinal direction, and small reinforcing plates 4 are provided at predetermined positions between the reinforcing plates 44.
4A is joined. When the negative bar 16C is held by suction, the reinforcing plate 44 and the reinforcing plate 44A may be sucked by a suction cup or a magnet. This allows
The weight of the negative bar 16 can be reduced.

The above-described embodiment does not limit the configuration of the present invention. The present invention can be used for a plate printing apparatus having an arbitrary configuration in which the negative film N is attached to the negative bar 16 and the negative film N is used to position the negative film N.

In the present embodiment, the negative film N is used as the original film. However, the negative bar 16 to which the present invention is applied is not limited to the negative film, and may be used for processing a positive film.

Further, the negative bar 1 applied to the present embodiment
No. 6 does not limit the shape and the like of the film auxiliary fitting to which the present invention is applied.

[0084]

As described above, according to the present invention, the original film is attached to the thin auxiliary metal body and the thick reinforcing plate is provided at a predetermined position. Is easy to attach. Further, if the reinforcing plate is sucked by a suction cup, a magnet, or the like, an excellent effect of securely holding the auxiliary fitting main body to which the document film is attached can be obtained.

Further, according to the present invention, when the original film is brought into close contact with the printing plate, there is no gap which causes negative pressure leakage, so that the original film can be surely brought into close contact with the printing plate.

[Brief description of the drawings]

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

FIG. 2 is a schematic plan view showing a main part of a sticking section provided in the plate printing apparatus.

FIG. 3 is a schematic perspective view showing an example of a negative bar to which the present invention is applied.

FIG. 4 is a schematic perspective view showing one negative bar to which the present invention is applied.

FIG. 5A is a schematic cross-sectional view of a main part along the longitudinal direction of the negative bar, and FIG. 5B is a longitudinal direction of the negative bar showing the vicinity of the edge of the printing plate when the negative film is suction-held on a printing platen. It is a principal part schematic sectional drawing in alignment with.

FIG. 6 is a schematic plan view of the printing platen showing an example in which a printing plate is placed on the printing platen.

FIG. 7 is a schematic view showing a state in which a printing plate P2 and a negative bar 16B are placed on a printing platen.

FIG. 8 is a schematic view showing a state in which a printing plate P1 and a negative bar 16A are placed on a printing platen.

FIG. 9 is a schematic perspective view showing another example applicable as a negative bar of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Plate printing apparatus 16, 16A, 16B Negative bar (Auxiliary metal fittings) 20 Baking part 20A Printing plate 36 Negative bar main body (Auxiliary metal fittings body) 38 Slot 40 Adhesive tape 44, 46, 48, 50 Auxiliary plate 74 Magnet 98 Suction groove N Negative film (original film) P, P1, P2 Printing plate

Claims (4)

[Claims] 1. An auxiliary fitting main body formed in a belt-like thin shape and having an original film on which an image to be printed on a printing plate is recorded attached to a predetermined position on one end side in a width direction along a longitudinal direction; And a thick metal flat reinforcing plate divided and fixed to a predetermined position along the longitudinal direction at the other end of the film in the width direction. 2. The auxiliary metal structure for a film according to claim 1, wherein the reinforcing plate is divided based on a position of the original film to the auxiliary metal body and is joined at predetermined intervals. . 3. The method according to claim 1, wherein the reinforcing plate is divided and joined based on a relative position to the printing plate when the original film is positioned on the printing plate. Auxiliary bracket structure for film. 4. The positioning device according to claim 1, wherein a positioning hole used for positioning the auxiliary fitting body is formed at a predetermined position where the reinforcing plate is joined. Auxiliary bracket structure for film.