JP2003195514A - Electronic plate making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an electronic plate making machine which can previously form margins requested for a print master. <P>SOLUTION: The electronic plate making machine equipped with a laser scanning unit 6 which scans an image horizontally and a feed roll 5 which is added facing the laser scanning unit 6 and synchronously feeds a master sheet X in a vertical scanning direction, is equipped with the laser scanning unit 6 which is fixed to a movable frame 25 capable of moving in the horizontal scanning direction, a driving means 35 which moves the movable frame 25 to a position corresponding to margins to be formed, and a couple of light emitting elements 45 and 46 which are fixed to the movable frame 25 in a state of opposing to non-image parts at both ends in the horizontal scanning direction and remove electric charges on the surface of the master sheet X by light emission. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate making machine for producing a printing original plate, and more particularly to an electronic plate making machine for forming an image on the surface of a master sheet using a laser scanning unit.

[0002]

BACKGROUND ART As is well known, in a plate making machine for producing a printing master, which is a printing original plate, there is already one that forms a digital image read from a computer using a laser scanning unit on the surface of a master sheet. Are known. In other words, in this electronic plate making machine, a master roll having a width wider than the main scanning width of the laser scanning unit is controlled in the sub-scanning direction by using a feed roll to form a digital image on the surface of the master sheet.

By the way, in an actual print master, there are various requirements for the position of the margin, which is a grip margin, and its width due to the convenience of the plate cylinder of the printing machine. That is, the margin position is the front margin, the rear margin, the right margin, the
There are various requirements such as the left margin, and there are many requirements for the required width, that is, the margin amount.

[0004]

However, since the conventional position described above cannot meet these requirements regarding the margin, the print master is completed with a sufficient margin around the master sheet. The printing master is cut later to form the necessary margins according to the requirements of the printing machine. For this reason, since the completed print master is cut later, the valuable image surface is often damaged in the cutting process, and when printing a page, there may be a problem with the uniformity of each page. It was

An object of the present invention is to obtain an electronic plate making machine capable of forming a margin required in advance as a printing master in view of the problems of the conventional electronic plate making machine as described above.

[0006]

To achieve this object, the present invention provides a laser scanning unit for main scanning an image, and a master sheet attached to the laser scanning unit to feed the master sheet synchronously in the sub-scanning direction. In an electronic plate making machine including a feed roll, the laser scanning unit fixed to a movable frame that is movable in the main scanning direction, a driving unit that moves the movable frame to a position according to a margin to be formed, and The present invention proposes an electronic plate making machine provided with a pair of light emitting elements which are fixed to the movable frame in a state of facing the non-image portions at both ends in the main scanning direction and which remove the electric charges on the surface of the master sheet by emitting light.

In the description of the preferred embodiments of the present invention described below, 1) the driving means has a stepping motor controlled by a command signal, and the light emitting element is a plurality of LED elements arranged in the main scanning direction. Structure to be configured, 2) A structure in which the laser scanning unit includes the feed roll that scans the digital image from the laser scanning unit and an exposure table device that optically projects a document image will be described. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a plate making machine according to the present invention shown in the drawings will be described below. FIG. 1 shows an overall cross section of a digital plate making machine capable of processing a digital image or an original image as needed, and a master sheet roll having a different size can be mounted on the lower right portion of the machine body 1 capable of blocking external light. The sheet feeding device 2A and the second sheet feeding device 2B are incorporated.

The first sheet feeding device 2A and the second sheet feeding device 2B include a detachable mounting drum 2a to which a master sheet roll can be attached, a feeding roller 2b for pulling out the leading end of the master sheet X, and the master sheet X. A cutter 2c for cutting to a designated length and a paper feed roller 2d are provided respectively, and the cut master sheet X passes through the first path 3a and the second path 3b and is located above the first paper feeding device 2A. It is sent to the paper feed path 3. A charging electrode unit 4 for charging the master sheet X is provided in the middle of the sheet feeding path 3.
The master sheet X passing through the charging electrode unit 4 is supplied to the feed roll 5 at the center of the upper part of the machine body 1 which is driven at a sub-scanning speed. A laser scanning unit 6 for scanning an original image in the main scanning direction perpendicular to the paper surface of FIG. 1 is located above the paper feeding path 3, and a digital image from a computer (not shown) or the like is scanned by the laser scanning unit 6. The surface of the feed roll 5 is scanned from 6.

The surface of the master sheet X located on the feed roll 5 is beam-scanned by the laser scanning unit 6 while the feed roll 5 is rotating at a controlled speed, and the original image is formed on the photosensitive surface of the master sheet X by the scanning. Although formed into a latent image, the latent image-forming master sheet X is supplied to an exposure table device 8 arranged in a substantially vertical direction in a substantially central portion of the machine body 1 through an intermediate guide unit 7, and then from the exposure table device 8. It is delivered to the wet developing device 9 located at the lower left of the machine body 1. Further, in the upper left portion of the machine body 1, a document table 1 for optically capturing a document image is provided.
0 is provided, and the image of the document on the document table 10 is projected onto the surface of the exposure table 8a of the exposure table device 8 using the exposure optical system 11. That is, the illustrated exposure optical system 11 includes an illumination lamp 11a that illuminates the document table 10 on which a document is set, a projection lens 11b that forms a document image on the surface of the exposure table 8a, and a mirror 11c.

The above-mentioned wet developing device 9 has a developing solution nozzle 13 for ejecting a developing solution onto the developing pallet 12 through which the master sheet X passes, and the developing pallet 12 is inclined downward in the conveying direction of the master sheet X. A developer tank 14 for collecting the developer is located below the. Further, a squeeze roller device 15 is located at the rear end of the developing pallet 12, and the excessive developing solution on the surface of the master sheet X is removed by the rotational movement of the squeeze roller device of the squeeze roller device 15 described later. .

The master sheet X, on which the original image has been developed, is dried by the heat fixing device 16 adjacent to the exit side of the wet developing device 7 to fix the toner image, and the paper discharge roller 17 provided on the lower left side of the machine body 1 is fixed. It is collected on the collecting tray 18 outside the machine body 1 by the discharging movement.

2 to 4 show the peripheral portion of the laser scanning unit 6 described above, and a rectangular fixing frame 21 fixed to the machine body 1 is positioned above the feed roll 5 while being positioned in the horizontal plane. There is. A pair of slide rails 23 and 24 extending in a direction parallel to the lengthwise direction of the feed roll 5 are fixed to the inner surface of the fixed frame 21, and a laser beam is provided between the slide rails 23 and 24. A frame-shaped movable frame 25 that holds the scanning unit 6 is supported. That is, a flat box-shaped laser scanning unit 6 is mounted inside the movable frame 25 via the mounting bracket 27.
Is installed, and a digital image is main-scanned on the peripheral surface of the feed roll 5 by the laser scanning unit 6.

Below the fixed frame 21, the slide rails 23,
A feed screw 31 parallel to 24 is installed, and this feed screw 3
A timing belt 37 led from a drive sprocket 36 of a stepping motor 35 is hung on the driven sprocket 33 at one end of the No. 1 unit. A nut 39 is screwed into an intermediate portion of the feed screw 31, and the nut 39 is held by a connecting member 41 hanging from the movable frame 25. Therefore, the rotation of the feed screw 31 causes the movable frame 25 and the laser scanning unit 6 to move. The laser scanning unit 6 can be moved in the main scanning direction of the laser.

On the other hand, a pair of mounting plates 43 and 44 facing each other in the direction parallel to the main scanning direction are fixed to the lower part of the movable frame 25, and these mounting plates 43 and 44 are aligned in the main scanning direction. A large number of LED elements 45 and 46, that is, the light emitting elements are attached, and these LED elements 4
By the light emission of 5,46, the charges of unnecessary portions on the surface of the master sheet X are removed. That is, these LED elements 45 and 46 are opposed to each other with a space equal to the main scanning width W of the laser of the laser scanning unit 6 shown in FIG.
When the master sheet X is moved to the sub-scan indicated by the arrow by the synchronized rotation of the feed roll 5, the electric charges in the left and right margins of the scanning screen are removed by the light irradiation of the LED elements 45 and 46.

Since the electronic plate making machine according to the illustrated embodiment has the above-described structure, the position of the laser scanning unit 6 in the direction perpendicular to the paper surface of FIG. 3 is adjusted by the stepping motor 35, and the laser irradiation to the master sheet X is started. A print master having a margin at a desired position can be obtained only by designating the position in advance.

That is, as shown in FIG. 5, when the front margin portion FM is required, the position of the laser scanning unit 6 in the main scanning direction is aligned with the central position of the master sheet X in the feeding direction, and the LED elements 45 and 46 are arranged. If the image is formed in the lighted state, the front margin portion FM indicated by hatching can be formed in the front portion of the master sheet X. In this case, the front margin part F
The width L1 of M can be freely determined by the laser writing position of the laser scanning unit 6 with respect to the sub-scanning direction given by the feed roll 5.

Further, as shown in FIG. 6, the rear margin portion B
When M is required, as in the case of the front margin, the position of the laser scanning unit 6 in the main scanning direction is aligned with the central position in the feeding direction of the master sheet X, and the LED elements 45 and 46 are arranged.
When is turned on, if the image forming position is calculated backward and an image is formed on the surface of the master sheet X, it is possible to form a rear margin portion BM indicated by hatching at the rear portion of the master sheet X. In this case, the width L2 of the rear margin portion BM is the width of the feed roll 5
Laser scanning unit 6 for the sub-scanning direction given by
It can be freely decided by the laser writing position.

That is, as shown in FIG. 7, when the right margin portion RM is required, the position of the laser scanning unit 6 in the main scanning direction is moved to the left side in the feeding direction of the master sheet X,
If an image is formed with the LED elements 45 and 46 turned on, the right margin portion RM shown by hatching can be formed on the right side portion of the master sheet X. In this case, the width L3 of the right margin portion RM can be freely determined by the offset amount of the laser scanning unit 6 in the main scanning direction.

Further, as shown in FIG. 8, the left margin portion L
When M is required, the position of the laser scanning unit 6 in the main scanning direction is aligned with the right side of the master sheet X in the feeding direction,
If an image is formed while the LED elements 45 and 46 are turned on, the left margin portion LM indicated by hatching can be formed on the left side portion of the master sheet X. In this case, the width L4 of the left margin portion LM can be freely determined by the offset amount of the laser scanning unit 6 in the main scanning direction, as in the case of FIG.

In the illustrated embodiment, the case of a light emitting element composed of an LED element is illustrated, but in the present invention, a surface light emitting element such as an electroluminescence element may be used instead of the LED element.

[0022]

As is apparent from the above description, according to the present invention, it is possible to freely manufacture a print master having a margin portion having a required position and width, and therefore, the margin portion can be cut by cutting it later. Compared with the conventional case of forming, it is possible to eliminate the possibility that page irregularities occur and images are damaged in the cutting process.

[Brief description of drawings]

FIG. 1 is an overall sectional view of an electronic plate making machine according to the present invention.

FIG. 2 is a plan view of a peripheral portion of a laser scanning unit of the electronic plate making machine.

3 is a sectional view taken along line 3-3 of FIG.

4 is a cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is an explanatory diagram showing a relationship between a laser scanning unit and a master sheet when creating a vertical hanging master having a front grip portion.

FIG. 6 is an explanatory diagram showing a relationship between a laser scanning unit and a master sheet when creating a vertical hanging master having a rear grip portion.

FIG. 7 is an explanatory diagram showing a relationship between a laser scanning unit and a master sheet when creating a horizontal hanging master having a right grip portion.

FIG. 8 is an explanatory diagram showing a relationship between a laser scanning unit and a master sheet when creating a horizontal hanging master having a left grip portion.

[Explanation of symbols]

X master sheet 5 feed rolls 6 Laser scanning unit 21 fixed frame 23, 24 slide rails 25 movable frames 31 Lead screw 35 stepping motor 39 nuts 43,44 Mounting plate 45,46 LED element

Continued front page    (72) Inventor Norihiro Yoshida             1-741 Kugayama, Suginami-ku, Tokyo Iwasaki             Communication machine Co., Ltd. F term (reference) 2C362 BA27 BA29 CB47 CB66 CB80                       DA04                 2H070 EE02 EE04 EE17 EE23                 2H084 AA30 AE03 BB13 CC05                 2H097 AA03 AB07 BA10 CA03 CA17                       LA01                 2H170 EE02 EE04 EE17 EE23

Claims (3)

[Claims] 1. An electronic plate making machine comprising: a laser scanning unit for main scanning an image; and a feed roll attached to face the laser scanning unit for feeding a master sheet synchronously in the sub scanning direction. The laser scanning unit fixed to a movable movable frame, driving means for moving the movable frame to a position according to a margin to be formed, and the laser scanning unit facing the non-image portions at both ends in the main scanning direction. An electronic plate making machine, comprising: a pair of light emitting elements which are fixed to a movable frame and remove electric charges on the surface of the master sheet by emitting light. 2. The driving unit has a stepping motor controlled by a command signal, and the light emitting element is composed of a large number of LED elements aligned in the main scanning direction. Electronic plate making machine. 3. The laser scanning unit comprises the feed roll for scanning a digital image from the laser scanning unit, and an exposure table device for optically projecting a document image. 1 or claim 2
Electronic plate making machine described in any one of.