JPH07113770B2 - Belt transport type multi-sided printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a belt-conveying type multi-side printing machine for printing an image of a film original onto a photosensitive material.

<Prior Art> In the plate-making work, there is a work in which one film original plate is repeatedly printed on a photosensitive material such as a PS plate in multiple directions.

In such a case, a printing machine generally called a stencil machine is used, and the above-mentioned belt-conveying type multi-sided stencil machine is also a kind of stencil machine.

As a belt-conveying type multi-side printing machine of this type, the ones shown in FIGS. 11 and 12 proposed by the present applicant in JP-A-60-10253 are known.

It is provided on the upper surface of the machine frame main body 1 so as to be able to move up and down, and is provided with a printing table 2 on which a sensitive material P such as a PS plate is placed, and a translucent plate 5 on the lower surface of the edge frame 4. And an upper frame 3 which is openable and closable and an XY movable with respect to the printing table 2 and which holds the film original plate S and positions the film original plate S at a predetermined position on the photosensitive material P. Belt 6, the exhaust means 12 for exhausting the space between the translucent plate 5 of the closed upper frame 3 and the printing table 2 to bring the photosensitive material P and the original plate S into close contact, and the mask attached to the upper frame 3. An apparatus (not shown) and a light source 8 for printing are provided, and one photosensitive material P is provided with a film original plate S.
Is designed to be printed on multiple sides.

In addition, this type of belt conveyance type multi-sided printing machine is a multi-sided printing machine,
It is also used as a printing frame device, and the printing light source 8 is arranged at a relatively high position above the printing table so that the entire surface of the printing table 2 has a substantially uniform illuminance distribution. In addition, there is a type in which the position of the printing light source 8 can be appropriately moved up and down according to the size of the photosensitive material P.

<Problems to be Solved by the Invention> Generally, in this type of apparatus, a printing light source containing a large amount of ultraviolet rays is used in consideration of the photosensitive wavelength range of a PS plate or the like. When the ultraviolet rays contained in the printing light source are directly incident on the naked eye of the operator, the irritation is too strong, and therefore it is desirable to avoid ultraviolet rays as much as possible for safety and hygiene. To avoid UV rays, it is possible to install a blackout curtain around the printing machine,
Dust easily attaches to the light-shielding curtain, and the dust is scattered as the light-shielding curtain opens and closes.

When such dust adheres to the translucent plate, it causes pinholes in the printed image, which significantly deteriorates the quality of the printed image.

The present invention has been made in view of the above circumstances, and provides a belt-conveying type multi-side printing machine capable of preventing dust from adhering to a transparent plate and monitoring the inside of a light-shielding cover without being affected by ultraviolet rays. To aim.

<Means for Solving the Problems> The present invention is configured as follows to achieve the above object.

The invention according to claim 1 is provided on the upper surface of the machine frame main body,
A baking table on which the photosensitive material is placed, an upper frame provided on the baking table so as to be openable and closable and provided with a translucent plate, a drive means for driving the upper frame to be openable and closable, and a film original plate. A belt-conveying type multi-sided printing machine for printing an image of the film original plate on the photosensitive material, which covers the printing table and the upper frame. In this state, a light-blocking cover is provided on the machine frame body so as to be openable and closable, and the light-blocking cover has a transparent portion that transmits visible light and blocks ultraviolet rays on the front side, and a baking light source that radiates light downward. And a contact engagement member that contacts the upper frame on the front inner wall of the light-shielding cover, and the upper frame is contacted with the contact engagement member by opening the upper frame by the drive means. The feature is that the light shielding cover is opened at the same time.

Further, the invention according to claim 2 is provided with a baking table which is provided on the upper surface of the machine frame main body and on which a sensitive material is placed, and an upper frame which is provided so as to be openable and closable with respect to the baking table and which includes a transparent plate. And a drive means for driving the upper frame to open and close freely, and an original plate conveying belt for holding the film original plate and positioning it at a predetermined position on the photosensitive material, and printing an image of the film original plate on the photosensitive material. A belt-conveying type multi-side printing machine, in which a light-blocking cover is fixedly mounted on the machine frame main body in a state of covering the printing table and the upper frame, and the light-blocking cover is for printing the upper part downwardly with light. The light source and the front part can slide up and down freely,
And a front door that transmits visible light and blocks ultraviolet rays.

The invention according to claim 3 is the belt-conveying type multi-sided printing machine according to claim 2, wherein:
A contact engagement member that comes into contact with the upper frame, and by opening the upper frame by the driving means, the upper frame contacts the contact engagement member to simultaneously open the front door. To do.

<Operation> In the invention according to claim 1, in the state in which the printing table and the upper frame are covered, a light shielding cover is provided on the machine frame main body so as to be openable and closable, and the light shielding cover transmits visible light to the front side and blocks ultraviolet rays. A see-through part, and a printing light source that emits light downwards on the upper part,
Since the front inner wall of the light-shielding cover is provided with the engaging member that comes into contact with the upper frame, the following action is achieved.

The light-shielding cover covers the baking table on which the photosensitive material is placed and the upper frame provided with the transparent plate, and prevents dust from adhering to the transparent plate of the upper frame. Further, the transparent portion on the front side of the light shielding cover transmits visible light and blocks ultraviolet rays emitted by the printing light source. Further, by opening the upper frame by the driving means, the upper frame comes into contact with the contact engagement member provided on the front inner wall of the light shielding cover to simultaneously open the light shielding cover.

In the invention according to claim 2, a shading cover is fixedly provided on the machine frame main body in a state of covering the baking base and the upper frame, and the shading cover is slidable vertically on the baking light source on the upper part and on the front part. Since it has a front door that transmits visible light and blocks ultraviolet rays, it operates as follows.

The light-shielding cover covers the baking table on which the sensitive material is placed and the upper frame provided with the light-transmitting plate, and prevents dust from adhering to the light-transmitting plate of the upper frame, as in the invention described in claim 1. To prevent. Further, the front door of the light shielding cover transmits visible light and blocks ultraviolet rays emitted by the printing light source.

According to a third aspect of the invention, in the belt-conveying type multi-side printing machine according to the second aspect, a contact engagement member that comes into contact with the upper frame is provided in the lower inner portion of the front door. When the frame is opened, the upper frame comes into contact with the contact engagement member provided on the lower inside of the front door to simultaneously open the front door.

<Example> Hereinafter, an example of the present invention is described based on a drawing.

FIG. 1 is a vertical sectional front view showing an upper half of a belt-conveying type multi-side printing machine according to a first embodiment of the present invention, FIG. 2 is a vertical sectional side view thereof, and FIG. 3 is a diagram showing its operating state, FIG. 4 is a perspective view of the belt transfer type multi-sided printing machine.

This belt-conveying type multi-side printing machine, as shown in FIG.
The light shielding cover 15 is provided on the machine frame main body so as to cover the printing base 2 and the upper frame 3, and the light source 8 for printing is disposed above the light shielding cover 15 as a basic example shown in FIG. In other respects, the structure is similar to that of the conventional example.

That is, as shown in FIGS. 1 to 4, this belt-conveying type multi-sided printing machine has a printing table 2 on which a sensitive material P is placed in a positionable manner.
And an upper frame 3 which is provided so as to be openable and closable with respect to the printing table 2, an original plate conveying belt 6 which is provided so as to be movable in X-Y with respect to the printing table 2, an exhaust means 12 for vacuum contact, and an upper part. An unwinding mask device 14 additionally disposed on the translucent plate 5 of the frame 3, a light-shielding cover 15 provided on the machine frame body 1 so as to be openable and closable so as to cover the baking base 2 and the upper frame 3, and light-shielding. The image forming apparatus is provided with a printing light source 8 arranged on the upper part of the cover 15 and is configured to print the pattern Sa of the film original plate S on the photosensitive material P in multiple directions.

The printing table 2 is supported on the upper part of the machine frame main body 1 so as to be able to move up and down through an elevating and supporting means (not shown), and like the conventional example (FIG. 12), the positioning pins 11, 11 of the photosensitive material P and the exhaust means 12 are provided. An exhaust port 13 communicating with the.

As shown in FIG. 3, the upper frame 3 can be switched to a fully open position A, a half open position B, and a closed position C by an air cylinder 7 as a driving means. Or the film original S is replaced, and the original conveying belt 6 is operated in the half-opened posture B to move the film original S to XY.
It is configured to be moved in the direction, positioned at a predetermined position, and contact-printed in the closed posture C. Although the upper frame 3 is opened and closed by an air cylinder, it is obvious that other driving means such as a motor or a solenoid can be used.

As in the conventional example (Fig. 12), the original plate conveying belt 6 is a pair of pulleys arranged on the left and right of the printing table 2 as shown in Fig. 1.
An endless strip with a plate thickness of 0.2 mm is wrapped around 10 and 10 and a baking stand 2
Is provided so as to surround it and is movable in the front-back (Y) direction with respect to the printing table 2.

Similar to the conventional example (FIG. 12), the film original plate S has its front end side fixed to the original plate conveying belt 6 with the adhesive tape Tp, and is aligned with the photographic material P positioned on the printing table 2 in the XY direction. Is positioned in the direction. At this time, the printing table 2 is slightly lowered to form a relatively movable gap with the original plate transport belt 6. By blowing the air ejected from the air nozzle 9 into the gap, the rear end side of the film original plate S is prevented from hanging down and coming into contact with the photosensitive material P.

The structure of the light shielding cover will be described below with reference to FIGS. 1 and 2.

The light-shielding cover 15 is provided on the machine frame main body 1 so as to be openable and closable via a hinge 16, has a see-through portion 15a for blocking ultraviolet rays and transmitting visible light on the front side of the operation side, and has a printing light source 8 arranged on the upper portion thereof. The printing light source 8 is provided so as to be movable in the left-right direction (arrow G in FIG. 1) and the up-down direction (arrow H in the figure).

That is, a traveling opening 15b for the printing light source 8 is provided on the ceiling of the light-shielding cover 15, and an unwinding light-shielding curtain 28 similar to the unwinding mask device 14 is attached to the opening 15b. Even if the printing light source 8 moves in the left-right direction, the light-shielding state can be maintained and dust is prevented from entering.

In addition, a pair of traveling rails 1 are provided on the lower front and rear sides of the opening 15b.
7 ・ 17 is attached, and traveling platform 1 along traveling rails 17 ・ 1
8 is provided so as to be able to travel in the left-right direction on the paper surface of FIG. 1, a column 25 is erected on a traveling base 18, and the printing light source 8 is supported via a support 26 so as to be vertically movable. Reference numeral 19 is a rolling wheel.

A self-propelled traveling means 20 is attached to the lower rear portion of the traveling frame 18. The traveling means 20 includes a drive motor 21, a drive pulley 22 fixed to the drive shaft of the drive motor 21, and a drive pulley.
It is composed of a pair of tension pulleys 23, 23 arranged on both sides of 22 and is constructed so as to wind around the drive pulley 22 with a timing belt 24 stretched in parallel with the traveling rail 17 and fixed at both ends. ing.

On the other hand, an air cylinder 27 is attached along the column 25 standing upright on the traveling frame 18, and the printing light source 8 is driven up and down by the air cylinder 27.

In other words, in the above-described embodiment, in the case of multi-sided printing, the printing light source 8 is lowered to print with a high illuminance, and a decrease in the illuminance distribution accompanying this is compensated for by moving the printing light source 8 together with the film original plate S. When used as a printing frame device, the printing light source 8 can be raised to the uppermost position and positioned in the center of the printing table 2 to print with a substantially uniform illuminance distribution.

Reference numeral 29 in FIG. 1 is a binding cable for wiring, reference numeral 30 is a light source cover, and reference numeral 35 in FIG. 2 is a light quantity sensor arranged at the lower end portion of the light source support 26 via an arm 34.

On the front inner wall of the light-shielding cover 15, an abutting engagement member 32 with which the upper frame 3 abuts on the upper open side is fixedly mounted at a required height, and the upper frame 3 moves beyond the half-open position (B) in FIG. When the light-shielding cover 15 is configured to open via the contact engagement member 32 when reaching the fully open position (A), and the upper frame 3 is closed, the same figure (D).
As described above, only the light shielding cover 15 can be opened and closed independently. Therefore, the half-opened posture B and the closed posture C of the upper frame 3 are repeated with the light-shielding cover 15 closed, so that the multi-sided printing operation can be automatically repeated. As a result, it is possible to effectively prevent dust from entering between the printing table 2 and the upper frame 3.

FIG. 5 is a diagram showing an operating state of the second embodiment. In this embodiment, the light shielding cover 15 is directly attached to the upper frame 3,
In addition to being configured to open and close integrally with the upper frame 3 (E in the same figure), only the light-shielding cover 15 is separately and independently opened and closed (F in the same figure) as needed, and in other respects, The configuration is similar to that of the first embodiment.

FIG. 6 is a perspective view of a belt-conveying type multi-side printing machine showing a third embodiment, and FIG. 7 is a vertical side view of the upper half thereof.

In this embodiment, a shading cover 15 is fixedly mounted on the machine frame main body 1 in a state of covering the baking base 2 and the upper frame 3, and the shading cover 15 is also provided.
A front door 31 is slidable upward on the front surface of the front door, a contact engagement member 32 is attached to the lower inside of the front door 31, and the upper frame 3 is in a half-open position B and a closed position C with the light-shielding cover 15 closed. When the upper frame 3 goes beyond the half-opened posture B and reaches the fully opened posture A, the front door 31 slides upward through the abutment engagement member 32 to be fully opened. Is configured.

According to this embodiment, the original film and the photosensitive material P can be replaced without opening the entire light-shielding cover.
As in the first embodiment, the front door 31 has a see-through window 15a that blocks ultraviolet rays and transmits visible light. Further, in FIG. 6, reference numeral 33 is a handle, 34 is an operation panel, and 35 is a translucent plate 3.
It is a side door for cleaning the inside of the. Other points are first
The configuration is similar to that of the above-mentioned embodiment.

FIG. 8 is a longitudinal sectional view of a main part showing another embodiment of the front door 31, FIG.
The figure is a perspective view schematically showing the opening / closing mechanism.

The front door 31 has a pair of wire locking members 38 at the bottom of its inner surface.
The a / 38b is fixed, one end of a pair of wires 45a / 45b is locked to the a / 38b, and the opening / closing mechanism 40 can be opened upward.

The opening / closing mechanism 40 includes an air cylinder 41 arranged in the upper part 15A near the front of the light-shielding cover 15, dual movable pulleys 43a and 43b that are moved by a predetermined stroke 1 by an output rod 42 of the air cylinder 41, and an upper part of the light-shielding cover. Three free pulleys 44a, 44b, 44c arranged on the front wall 15B and a set of wires 4
A locking tool 46 for locking the other ends of the 5a and 45b. Then, one wire 45a is locked at one end to the wire locking member 38a of the front door 31, is wound around the free pulleys 44a and 44c and the one moving pulley 43a, and is locked at the other end to the locking member 46. . One end of the other wire 45b is locked to the wire locking member 38b of the front door 31, is wound around the free pulley 44b and the other moving pulley 43b, and the other end is locked to the locking member 46.

In other words, by extending the output rod 42 of the air cylinder 41, the front door 31 is pulled up by a distance twice the extension stroke l thereof. A gas spring may be used instead of the air cylinder.
Further, reference numeral 41b in FIG. 8 indicates a support for the air cylinder 41, and 43c.
Is a support for a dual-movement pulley.

When the opening / closing mechanism 40 is used to open / close the front door 31, there is no possibility of twisting at both side guide portions of the front door 31, and smooth opening / closing operation is performed. Further, since the extension stroke of the output rod 42 is short, the opening / closing mechanism 40 has an advantage of being compact as a whole.

FIG. 10 is a longitudinal sectional view of a main portion showing still another embodiment of the front door 31. In this embodiment, a retractable shutter 31a is provided as a modification of the front door 31 in the third embodiment (FIG. 7), and other points are the same as those of the first embodiment. There is.

Further, in the above-described embodiment, the printing light source 8 is provided so as to be movable left and right and can be moved up and down. However, when a light source having a good illuminance distribution and a large amount of light is used, a suitable central portion of the printing table 2 is used. It may be positioned at the height and fixed to the light shielding cover 15.

<Effects of the Invention> As is apparent from the above description, the present invention has the following effects.

According to the first aspect of the present invention, dust is prevented from adhering to the light-transmitting plate of the upper frame by covering the baking table on which the sensitive material is placed with the light-shielding cover and the upper frame having the light-transmitting plate. can do. Further, the inside of the light-shielding cover can be monitored from the transparent portion of the light-shielding cover without being affected by ultraviolet rays during the baking operation. Furthermore, by opening the upper frame with the driving means,
Since the light-shielding cover can be opened at the same time, it is convenient when the light-sensitive material is replaced or the film original plate is replaced.

In the invention described in claim 2, similarly to the invention described in claim 1, it is possible to prevent dust from adhering to the light-transmitting plate of the upper frame. The inside of the light shield cover can be monitored without being affected by ultraviolet rays.

According to the third aspect of the present invention, the front door of the light-shielding cover can be opened at the same time by opening the upper frame by the driving means, which is convenient when the photosensitive material is replaced or the film original plate is replaced.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an upper half of a belt conveying type multi-side printing machine according to the first embodiment, FIG. 2 is a vertical sectional side view thereof, and FIG. 3 is a side view showing its operating state. FIG. 5 is a perspective view of the belt transfer type multi-side printing machine, FIG. 5 is a view showing an operating state of the second embodiment, and FIG. 6 is a perspective view of the belt transfer type multi-side printing machine showing the third embodiment. FIG. 7 is a vertical sectional side view of the upper half thereof, FIG. 8 is a longitudinal sectional view of an essential part showing another embodiment of the front door, and FIG. 9 is a perspective view schematically showing the opening / closing mechanism of the front door. Ten
FIG. 11 is a longitudinal sectional view of a main part showing still another embodiment of the front door,
FIG. 1 is a perspective view of a conventional belt transfer type multi-sided printing machine, and FIG. 12 is a plan view of the printing table. 1 ... Machine frame main body, 2 ... Printing base, 3 ... Upper frame, 5 ... Translucent plate, 6 ... Original plate conveying belt, 7 ... Air cylinder (driving means), 8 ... Printing light source , 15 …… Shade cover,
15a: see-through portion, 31 / 31a: front door, 32: abutting engagement member, P: sensitive material, S: film original plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Hachiman 1 465 Kuze Tsukiyama-cho, Minami-ku, Kyoto-shi, Kyoto Prefecture Dai-Nippon Screen Mfg. Co., Ltd., in the Kuze factory (72) Keisuke Hirai, Kuze, Minami-ku, Kyoto-shi, Kyoto 1 465 Tsukiyama-cho, Dai-Nippon Screen Mfg. Co., Ltd., in the Kuze Factory (56) References Japanese Patent Laid-Open No. 54-126105 (JP, A) Shoukai 62-19649 (JP, U)

Claims (3)

[Claims] 1. A printing table provided on the upper surface of a machine frame main body for mounting a photosensitive material, and provided so as to be openable and closable with respect to the printing table.
The film includes an upper frame provided with a light-transmitting plate, a driving unit that drives the upper frame to open and close freely, and an original plate conveying belt that holds the film original plate and positions it at a predetermined position on the photosensitive material. A belt-conveying multi-sided printing machine for printing an image of an original plate on the photosensitive material, in a state of covering the baking table and the upper frame, a light-shielding cover is provided on the machine frame main body so as to be openable and closable, and the light-shielding cover is A transparent portion that transmits visible light and blocks ultraviolet rays on the front side, a baking light source that radiates light downward on the upper side, and a contact engagement member that abuts the upper frame on the front inner wall of the light shielding cover. A belt-conveying type multi-side printing machine, characterized in that, by opening the upper frame by the driving means, the upper frame comes into contact with the contact engagement member to simultaneously open the light-shielding cover. 2. A printing table, which is provided on the upper surface of the machine frame body and on which a sensitive material is placed, and which is provided so as to be openable and closable with respect to the printing table.
The film includes an upper frame provided with a light-transmitting plate, a driving unit that drives the upper frame to open and close freely, and an original plate conveying belt that holds the film original plate and positions it at a predetermined position on the photosensitive material. A belt-conveying multi-sided printing machine for printing an image of an original plate on the photosensitive material, in a state of covering the baking table and the upper frame, a light shielding cover is fixedly installed on the machine frame main body, and the light shielding cover is an upper portion. Further, the belt conveyor is characterized by including a printing light source that emits light downward, and a front door that can be slid up and down vertically on the front surface and that transmits visible light and blocks ultraviolet rays. Type multi-sided printing machine. 3. The belt-conveying type multi-side printing machine according to claim 2, further comprising an abutting engagement member that abuts against the upper frame on a lower inner side of the front door, the upper frame being driven by the driving means. A belt-conveying type multi-side printing machine, wherein the upper frame comes into contact with the abutting engagement member to open the front door at the same time when the door is opened.