JPH05434U - Original printing laser drawing device - Google Patents

Abstract

(57) [Abstract] [Purpose] Vibration does not occur from the moving table drive means, and therefore vibration of the laser focusing means is prevented, and high-precision processing and drawing speed of the printing original plate is higher than in the past. It is an object of the present invention to provide a printing original plate laser drawing apparatus that can be realized. A laser λ for drawing a printing original on a surface of a printing plate cylinder 30 rotated about a rotation axis is generated by a drawing laser generating means (not shown) to generate a laser λ.
Is focused on the surface of the cylindrical body 30 in the radial direction of the cylindrical body 30 by the laser mirror 21 provided on the moving table 20 that moves parallel to the rotation axis 31 along the surface of the cylindrical body 30.
Draw a print document. The uniaxial table 10 using a voice coil motor is used as the moving means of the moving table 20 that moves in parallel with the rotation axis 31 of the cylindrical body 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printing original plate laser drawing device that draws a printing original on a surface of a cylindrical rotating body for a printing original plate by a laser.

[0002]

[Prior Art]

 BACKGROUND ART A printing original is produced by drawing a printing original on a surface of a cylindrical rotating body for a printing original using a laser.

A conventional printing original plate laser drawing apparatus will be described with reference to FIG.

In FIG. 3, a printing original plate cylinder 1 is a cylinder on the surface of which a printing original is drawn by a laser. A rotary shaft 2 is inserted through the axis of the cylindrical body 1, and both ends of the rotary shaft 2 are supported by bearings 3 and 3. A motor 4 is connected to one end of the rotary shaft 2, and the cylindrical body 1 is rotated by the rotation of the motor 4.

A ball screw 10 is arranged in the vicinity of the cylindrical body 1 in parallel with the rotary shaft 2. A servo motor 11 is connected to one end of the ball screw 10. Further, a moving base 20 which is reciprocally movable by its rotation is mounted in contact with the ball screw 10. A laser mirror 21 for focusing a laser λ generated by a laser generating means (not shown) including a laser controller and a laser generator on the surface of the cylindrical body 1 is mounted on the upper surface of the movable table 20. ..

In the printing plate laser drawing apparatus having the above structure, the laser λ is focused on the surface of the rotating cylindrical body 1 by the laser mirror 21. The print original is drawn on the surface of the cylindrical body 1 by arbitrarily moving the laser mirror 21 along the surface of the cylindrical body 1.

[0007]

[Problems to be solved by the device]

 Since the laser mirror 21 is placed on the upper surface of the moving table 20 which is attached by contacting the ball screw 10 to which the servo motor 11 is connected, the vibration generated from the servo motor 11 rotates at high speed of the ball screw 10. Therefore, the laser beam is transmitted to the laser mirror 21 through the ball screw 10 and the moving table 20, and the exposure distance of the laser mirror 21 is out of the focus range, and the processing accuracy of the printing original plate is impaired. In particular, as the distance between the movable table 20 and the servo motor 11 increases, the processing accuracy of the printing original plate is significantly reduced. Conventionally, the number of revolutions of the servo motor 11 is set to a fixed value or less to prevent a reduction in the processing accuracy of the printing original plate, and thus there is a limit to the speed of drawing.

Therefore, in the present invention, vibration does not occur from the moving table driving means, and thus the vibration of the laser condensing means is prevented, and the printing original plate can be processed and drawn with higher precision than the conventional one. It is an object of the present invention to provide a printing original plate laser drawing apparatus capable of increasing the printing speed.

[0009]

[Means for Solving the Problems]

 The printing plate laser drawing apparatus of the present invention comprises a cylindrical rotating body which is rotated about an axis by a rotating body driving means and a cylindrical rotating body which is arranged in the vicinity of the cylindrical rotating body. Laser printing on a printing original plate comprising a moving table that moves parallel to the center and a laser focusing means that is placed on the moving table and focuses the laser generated by the laser generating means on the surface of the cylindrical rotating body. In the apparatus, the moving table driving means is a uniaxial table driven by a voice coil motor.

[0010]

[Action]

 In the printing plate laser drawing apparatus of the present invention, the moving table on which the laser focusing means is placed is driven by a voice coil motor as a moving table driving means for moving the moving table along the surface of the cylindrical rotating body in parallel with the rotation axis. Since the uniaxial table is used, the movable part and the fixed part of the moving table driving means are not in contact with each other, and the moving table driving means does not generate vibration. Therefore, the vibration of the laser focusing means is also prevented.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

In FIG. 1 and FIG. 2 in which the same parts as those of the conventional one are denoted by the same reference numerals, the printing original cylinder 1 is a cylindrical body on the surface of which a printing original is drawn by a laser. A rotary shaft 2 is inserted through the axis of the cylindrical body 1, and both ends of the rotary shaft 2 are supported by bearings 3 and 3. A motor 4 is connected to one end of the rotary shaft 2, and the cylinder 1 is rotated by the rotation of the motor 4.

A uniaxial table 40 using a voice coil motor is arranged in the vicinity of the cylindrical body 1 in parallel with the rotation axis. The uniaxial table 40 has a fixed portion including a box-shaped yoke 41 made of a magnetic material and having an open surface, a permanent magnet 42, and a center pole 43 made of a magnetic material, and a movable coil 44 fixed to the lower surface. And a movable part composed of a movable table 20 which is movable.

The fixed portion is configured as follows. That is, the two rectangular side yokes 41a, 41a and the two rectangular end yokes 41b, 41b are fixed to each other to form a frame body, and the bottom yoke 41c is formed so as to close one surface of the frame body. Are fixed to form a box-shaped yoke 41 which is open on one side. The permanent magnet 42 is bonded to the upper surface of the bottom yoke 41c. A center pole 43 is arranged above the permanent magnet 42 so as to face the permanent magnet 42, with both ends thereof fixed to the end yokes 41b and 41b, respectively. Sliding bearing means 13, 13 are attached to the upper surfaces of the side yokes 41a, 41a in the longitudinal direction thereof.

The movable part is configured as follows. That is, the movable coil 44 is loosely fitted in the center pole 43 so as to be reciprocally movable. The movable coil 44 is fixed to the lower surface of the movable table 20. Further, sliding bearing means 23 1, 23 are arranged on the lower surface 2 of the moving base 20 so as to face the sliding bearing means 13, 13 and slide with respect to each other, so that the moving base 20 can reciprocate. .. On the upper surface of the moving table 20, there is mounted a laser mirror 21 for focusing the laser λ generated by a laser generating means (not shown) including a laser controller and a laser generator on the surface of the cylindrical body 1. ing.

In the printing plate laser drawing apparatus having the above-described configuration, the laser λ is focused on the surface of the cylindrical body 1 rotated by the laser mirror 21 as in the conventional case. The laser copy 21 is arbitrarily moved along the surface of the cylindrical body 1 to draw a printed document on the surface of the cylindrical body 1. Since the uniaxial table 40 driven by the voice coil motor is used as the moving table driving means of the moving table 20, the movable part and the fixed part of the moving table driving means are not in contact with each other, and the vibration from the moving table driving means is generated. There is no. Therefore, the vibration of the laser mirror 21 is also prevented, the printing master plate can be processed with higher accuracy than ever before, and the moving speed of the moving table 20 can be made faster than ever before. The speed can be increased.

The uniaxial table may have a configuration other than the above as long as it is driven by a voice coil motor.

[0018]

[Effect of the device]

 In the printing plate laser drawing apparatus of the present invention, since the uniaxial table driven by the voice coil motor is used as the moving table driving means, the moving part and the fixed part of the moving table driving means are not in contact with each other, and the moving table driving means No vibration is generated from the means. Therefore, the vibration of the laser condensing means is also prevented, the printing original plate can be processed with higher accuracy than ever before, and the moving speed of the moving table can be made faster than ever before. , It is possible to speed up the drawing. That is, it is possible to provide a high-quality printing original plate in a short time.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a printing plate laser drawing apparatus of the present invention.

2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing a conventional printing original plate laser drawing apparatus.

[Explanation of symbols]

 10 ... Cylindrical body 20 ... Moving base 40 ... Uniaxial table

Front page continuation (72) Inventor Yasufumi Kamezawa 2-1-1 Oda Sakae, Kawasaki-ku, Kanagawa Prefecture No. 1 Showa Electric Wire & Cable Co., Ltd.

Claims (1)

Claims for utility model registration: 1. A cylindrical rotating body which is rotated about an axis by a rotating body driving means, and which is arranged in the vicinity of the cylindrical rotating body.
A moving table which is moved by the moving table driving means in parallel with the axis of the cylindrical rotating body, and a laser which is mounted on the moving table and focuses the laser generated by the laser generating means on the surface of the cylindrical rotating body. A printing original plate laser drawing apparatus comprising a condensing means, wherein the moving table driving means is a uniaxial table driven by a voice coil motor.