SU735442A1 - Apparatus for making printing plates - Google Patents

Description

(54) DEVICE FOR MANUFACTURING PRINTED

FORMS

one.

The invention relates to the printing industry and to be used in the creation of devices for the production of printing forms or images on light and temperature sensitive materials.

Printed plate making devices are known that contain a continuous laser, a high frequency modulator, a plate holder and a control system that can control the device either in a read mode from a pre-prepared original or in a mode for outputting information from a computer memory 1.

However, such devices have limited technological capabilities. When working in read mode, it becomes necessary to create a text original by using typesetting machines, page layout and manual editing.

When operating devices in the mode of outputting information from a computer memory, their disadvantage is the need to use a computer with a large amount of storage devices, in the order of 500 kilobytes required for

synthesis of characters by linear scanning (lineature scanning 200-400 lin / cm). As it is known, only multiprogram computers of high cost have such a memory capacity. For the layout of the full-format, it is necessary to use only one or two programs. Thus, the use of multi-program computers in this case is both inexpedient and uneconomical due to their low utilization rate.

to

Photodetective devices are also known, including laser devices that have a radiation source, a font carrier, a turret with lenses, a building mechanism, a holder of a fixing material and

15 control system 2.

The radiation source in these devices is a pulsed lamp, the flash of which occurs at the moment when the transparent negative image of the sign corresponding to 2 (5 code combination is opposite one of the turret lenses installed in the working position. The image of the sign is projected by the lens onto the photographic material.

It is also known a device for producing printing plates containing a laser radiation source electrically connected to a control unit, a carrier of pin marks, a lens system, a holder for fixing material and a line forming mechanism, the charge carrier being made of transparent marks 3.

However, using this device, you can only get a positive image of a font sign on an intermediate link in the process of obtaining a printing form - a photoform (using highly sensitive materials mainly on a halogen-silver base) and completely exclude the possibility of using this device to simultaneously obtain text and illustrative images.

The aim of the invention is to expand the technological capabilities of the photo-typing device for the manufacture of printing forms.

This is achieved in that the device has a carrier of illustrations with a drive electrically connected to the control unit and a second turret with lenses placed in front of the carrier of font characters, while the carriers of font characters and illustrations, the first and second turrets, the laser radiation source and the material holder are located coaxially relative to each other, and the laser radiation source is placed between the carrier and the font characters and the material holder.

In addition, font characters and media illustrations are made of a material that reflects the radiation of a laser source.

The beam reflected from the sign, the passage again through the laser tube (laser), is amplified so that its power is 3-4 times more than the power of the beam incident on the font or illustrative image carrier. Due to this, various known thermo and photosensitive materials deposited on a metal or other substrate, capable of evaporating, photo or thermopolymerizing under the action of laser radiation, can be used as a fixing material, creating printing or blank elements on the mold material. - - - - As a laser, pulsed metal vapor lasers, such as copper, lead, manganese, barium, can be used to create an active medium with high lasing efficiency and operating in a regime close to saturation.

FIG. 1 shows the structural scheme of the proposed device for the manufacture of printed forms; in fig. 2 - carrier of font characters reflecting radiation; in fig. 3 - carrier of illustrative images reflecting radiation.

The device comprises a laser 1, a turret 2 with an optical lens system, a drive 3 for rotation of a turret, a turret 4 with an optical lens system, a drive 5 for rotation for the turret, a carrier of 6 font characters, a drive 7

5 rotation and movement of the font of font characters, reflecting font characters 8, fixing material 9, holder 10 of fixing material, drive 11, providing two-coordinate movement of the holder of fixing material, carrier 12 of illustrative images 13 with drive 14 and control unit 15. The device operates as follows way., From control block J5 containing

j in the memory elements information about the image elements I (text and illustrations), the encoded signal enters the drive 7, as a result of which the desired character 8 of the continuously rotating font carrier 6 is searched and approached to the device centerline. Simultaneously, the synchronizing elements of the control unit 15 emit a signal to the flash of the laser pulse 1. The laser beam from laser 1, passing through the turret with lenses 2, illuminates the font character 8 of the font carrier 6 and after reflection from it passes through the active medium of laser 1, providing a sufficiently large force during the time of passage of the reflected signal. The reflected beam passes through the turret 4 with lenses

0 and falls on the fixing material 9. The two-coordinate movement of the holder 10 of the fixing material 9 is made by the actuator 11 from the control unit 15. If it is necessary to reproduce on the print form, along with text information of the illustrative images, turrets 2 and 4 are installed the carrier 6 of the font characters 8 is removed from the optical axis, and the carrier 12 of the illustrative, images 13 is output to the optical axis. With the help of the drive 14, the required illustrative image is set in the e rs position. Exposure of an illustrative image by laser radiation is produced in the same way as exposure of a font character. At the end of the exposure, the carrier 6 is brought to the optical axis, the corresponding turrets are installed and the corresponding signs are exposed.

 A device operating according to this principle allows one to exclude halide-silver light-sensitive materials and to obtain printed forms directly.

Claims (3)

1. An apparatus for making printing forms containing a laser source radiation, electrically connected to the control unit, a carrier of type characters, a turret with lenses and a material holder, whose drives are connected to the outputs of the control unit, and a string formation mechanism, characterized in that it has a front-mounted font characters are illustrations with a drive electrically connected to the control unit, and a second turret with lenses, with carriers of type characters and illustrations, the first and second turrets, laser radiation point and the material holder are aligned with one another, and the laser radiation source is placed between the font carrier and the material holder. 2. A device according to claim 1, characterized in that the font characters and illustrations of the carriers are made of a material that reflects the radiation of the laser source. Sources of information taken into account in the examination 1.Deutscher Drucker t. II, No. b, 1975, p. 18-51. 2. Petrokas L.V. and Shneerov L.A. Machines for dial production. M., 1973. 3. US patent number 3863262, CL- 354-5, 1975 (prototype). W