JPS6051699B2 - Plate making method on facsimile plate making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate making method in a facsimile plate making machine.

More specifically, manuscript paper and a plate such as mimeograph paper or an offset master plate are wound around a drum, and the reading means and recording means are moved along the length of the drum to scan the manuscript paper and the plate. The present invention also relates to a plate-making method in a facsimile plate-making machine in which the number of rotations of the drum is changed depending on the type of display object written on the manuscript paper, thereby making it possible to perform plate-making operations with different resolutions.

When a moving stage equipped with a reading means and a recording means is moved and scanned at a certain speed in the length direction of the drum, the number of scans per one rotation of the drum is the linear density, and the sub-scanning is performed in the length direction of the drum. In contrast, the circumferential direction of the drum is called main scanning, and main scanning is related to the number of rotations of the drum.

The degree to which the displayed matter written on the manuscript paper is clearly transferred to the mimeograph paper is determined by the main scanning and the sub-scanning. A conventional facsimile plate-making machine is configured to change only the movement and speed of the movable table, and only the linear density, in other words, the sub-scanning, is variable. The user sets the speed of the moving table according to the required resolution and performs plate-making work accordingly.

Higher resolution can generally be obtained by increasing the linear density by lowering the rotational speed of the drum and the moving speed of the moving stage. Therefore, in the past, only by adjusting the sub-scanning (linear density), it was possible to change the resolution of the displayed image written on the manuscript paper in only one direction, that is, in the length direction of the drum, and in the circumferential direction of the drum, that is, to change the resolution of the displayed object written on the manuscript paper. The resolution in the main scanning direction cannot be changed. In this case, it cannot be said that appropriate plate-making work can be performed depending on the differences in shading, size, etc. of the displayed object. In some cases, users prepare multiple plate-making machines with different drum rotation speeds so that they can handle plate-making operations with different required resolutions, but this is disadvantageous in terms of cost and other aspects. It is.

For users who only have a plate-making machine with a high resolution that can handle any type of manuscript paper, the moving speed of the moving table is set relatively slow, which increases the plate-making time. There was also a problem. The present inventors have devised the present invention in view of the above-mentioned conventional problems and to effectively solve them.

The object of the present invention is to set a manuscript paper and a plate such as a mimeograph or an offset master plate wrapped around a drum, and move a reading means and a recording means along the length of the drum. In the plate-making method in which the plate-making work is performed by scanning the manuscript paper and the plate by each means, the number of rotations of the drum is variable, and the number of rotations of the drum is changed. To provide a plate-making method in a facsimile plate-making machine, in which plate-making work with different resolutions can be performed by changing the rotational speed of a drum. Therefore, the object of the present invention is to solve the problem of the conventional movable table or the reading means installed thereon. Since the rotational speed of the drum can be changed in the same way as the moving speed of the recording means, it is now possible to arbitrarily set the main scanning in addition to the sub-scanning. A facsimile plate making system that can adjust the resolution and intensity of both main and sub-scanning according to the differences in shading, size, etc. of the displayed object, making it possible to perform plate-making work that is suitable for the type of manuscript paper. Provides a method for making a plate in a machine.

By configuring the plate-making machine as described above, it is possible to have commonality for manuscript papers with different display items, so the user only needs to own one plate-making machine, and the display content differs depending on the plate-making machine. It is possible to perform plate-making work that requires high resolution, and in plate-making work that does not require relatively high resolution, it is possible to increase the number of rotations of the drum and speed up the movement of the moving table, reducing plate-making time. It also becomes possible to achieve this, which is advantageous in terms of work efficiency. Further, the object of the present invention is to use a DC motor as a drive source for the drum, and to change the rotation speed of the drum by changing the voltage of the DC motor, which allows extremely simple operation such as switch operation. To provide a plate-making method for a facsimile plate-making machine in which the number of rotations of a drum can be changed.

Furthermore, an object of the present invention is to provide a speed change mechanism constituted by a variable diameter pulley between the drum and the drive source of the drum, so that the rotation speed of the drum can be infinitely controlled by the variable diameter pulley. To provide a plate making method in a facsimile plate making machine which can change the speed in a variable manner.

Another object of the present invention is to use an AC motor as a drive source for the drum, and by controlling the frequency of the motor, the number of revolutions of the drum can be changed, and by using a mechanical mechanism. First, to provide a plate making method for a facsimile plate making machine in which the number of revolutions can be changed electrically.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment, in which manuscript paper 2 and mimeograph paper 3 are wound and set on a drum 1, separated in the length direction.
A rotating shaft 1a to which a large-diameter pulley 4 is fixed is provided protruding from one end face of the rotary shaft 1a.

A belt 6 is stretched between the pulley 4 and the small diameter pulley 5, and the small diameter pulley 5 is attached to the drive shaft of a DC motor 7.
As a result, the drum 1 is rotated by the drive of the DC motor 7 via the large and small diameter pulleys 4 and 5 and the belt 6. A switch 8 is connected to the motor 7, and this switch 8 controls the voltage.As is well known, the rotation speed of the DC motor 7 changes depending on the voltage change, so the switch 8 is connected to the motor 7.
The rotational speed of the drum 1 can be controlled and changed by the operation. A belt 9 having a length sufficient for the length of the drum 1 is stretched around the side of the drum 1, and this belt 9 is stretched over pulleys 10 and 11.

One pulley 1J10 has a reduction mechanism 12 composed of gears, etc.
A motor 13 such as a DC motor or a pulse motor is connected to this mechanism 12. Therefore, the belt 9 is moved in the length direction of the drum 1 by the drive of the motor 13. In this case, since the rotation speed of the motor 13 can be changed by voltage control when the motor 13 is a DC motor or by pulse number control when it is a pulse motor, the moving speed of the belt 9 can be made variable. A movable table 14 is integrally connected to the belt 9 by a connecting piece 14a, so that the movable table 14 is movable along with the belt 9 in the length direction of the drum 1. An optical reading means 15 is installed on the movable table 14 at a position facing the original paper 2, and this means 15 is composed of a light source, a light projecting lens, a photoelectric conversion element, etc.
A light beam is irradiated onto the original paper 2, and the reflected light is received by a photoelectric conversion element, and the original paper 2 is read and photoelectrically converted based on the brightness and darkness of displayed objects such as characters and pictures written on the original paper 2.

Further, a recording means 16 is installed on the movable table 14 at a position facing the mimeograph paper 3, and this means 16 is equipped with a recording needle 16a.
6a energizes or discharges electricity to the mimeograph paper 3 to form the same image of the displayed object written on the manuscript paper 2. This plate-making work is accomplished by rotating the drum 1 and moving the moving table 14 along the drum 1, and by scanning the manuscript paper 2 and the mimeograph paper 3 by the reading means 15 and the recording means 16. Ru.

In this case, if the displayed object is dark or large and a relatively high resolution is not required, the motor 7 is increased so that the rotational speed of the drum 1 is increased and the moving speed of the moving table 14 is increased. , 13 is determined. This increases the rotational speed of the drum 1 and
The linear density, expressed as the number of scans per rotation of the

On the other hand, if the displayed object is finely or delicately displayed and a relatively high resolution is required, the drum 1
The linear density is increased by lowering the rotational speed of the moving table 14 and slowing down the moving speed of the moving table 14. As described above, both the main scanning and sub-scanning are adjusted according to the differences in shading, size, etc. of the displayed object written on the manuscript paper 2, and the difference in required resolution can be handled with a single facsimile plate-making machine. be able to.

Note that the rotation speed of the drum 1 is 600 r. p. If it exceeds 6 m, contact failure of the recording needle 16a may occur, which is undesirable.
00r. p. It is desirable to set the drive ratio of the large and small diameter pulleys 4 and 5 so that the drum 1 rotates at a speed of less than m. In this first embodiment, the rotation speed of the drum 1 can be changed in a continuously variable manner by voltage control of the switch 8, and by an extremely simple switch operation.

FIG. 2 shows only the main parts of the second embodiment, and the same reference numerals are used for the same components as in the first embodiment. That is, 1
is a drum, and 4 and 5 are large and small diameter pulleys.
This is a belt installed on 5.

The small diameter pulley 5 is fixed to the end of the driven shaft 20.
The sliding body 21 is slidably attached to the shaft 20 by spline fitting or the like, and the sliding body 21 is configured to rotate together with the shaft 20. A large diameter gear and a small diameter gear 21 are provided at both ends of the sliding body 21.
a, 21b are formed. A drive shaft 22 connected to a motor that rotates at a constant rotation speed is provided in parallel with the driven shaft 20, and a large diameter gear 22a1 and a small diameter gear 22b are fixed to this shaft 22 at a constant distance. In the figure, the small-diameter gear 22b and the large-diameter gear 21a of the sliding body 21 are in mesh with each other, and the driven shaft 20 rotates at a low speed due to the rotation of the drive shaft 22, so the rotation speed of the drum 1 can be kept low. I can do it. When the sliding body 21 is moved to the left in the figure, the small diameter gear 2 of this sliding body 21
1b meshes with the large-diameter gear 22a, the rotational speed of the driven shaft 20 increases, and the rotational speed of the drum 1 can be increased.

As a result, the rotational speed of the drum 1 can be changed stepwise, and this embodiment is suitable for such a rotational speed change. Note that by providing three or more large and small diameter gears instead of two, it is possible to further increase the variation in the rotational speed of the drum 1.

FIG. 3 shows only the main parts of the third embodiment, and the same reference numerals are used for the same components as in the first embodiment.

That is, 1 is a drum, and 4 and 5 are large and small diameter pulleys on which a belt 6 is installed.

The small diameter pulley 5 is fixed to the end of the driven shaft 30.
A drive shaft 3 connected to a motor that rotates at a constant speed in parallel with
1 will be provided.

Variable diameter pulleys 1J32, 33 are attached to the two shafts 30, 31, and these variable diameter pulleys 32, 33 are composed of two single pulleys 32a, 32b, 33a, 33 that can be separated and combined.
b, and one unit 32a, 33a is connected to each shaft 30.
, 31, and the other single body 32b, 33b
are slidable on their respective shafts 30 and 31. Springs 34 and 35 are installed in the variable diameter pulleys 32 and 33, and a resilient force is applied so that one of the single bodies 32a and 33a separates the other single bodies 32b and 33b. two shafts 30, 31
Furthermore, sliding bodies 36, 37 are slidably attached, and elastic springs 38, 39 are also interposed between the sliding bodies 36, 37 and the other single bodies 32b, 33b. 40 is pin 41
It is a rotating body that rotates around , and can be rotated by operating a knob 40b formed on an operating piece 40a.

Rollers 42 and 43 that come into contact with the sliding bodies 36 and 37 are attached to both ends of the rotating body 40.

Further, a belt 44 is placed over the variable diameter pulleys 32 and 33.

When the drive shaft 31 is rotated, the driven shaft 30 can be driven via the variable diameter pulleys 32 and 33 and the belt 44.

When the rotating body 40 is rotated counterclockwise in the figure, the roller 4
3 presses the other pulley unit 33b via the sliding body 37, and one pulley unit 33b. The unit is moved in the direction of the unit 33a. As a result, the diameter of the belt 44 installed over this portion of the variable diameter pulley 33 increases. Along with this, the other pulley unit 32b of the variable diameter pulley 32 is separated from the one pulley unit 32a due to the retreating roller 42, so that this. The diameter of the belt 44 installed over the portion is reduced. Therefore, the rotational speed of the driven shaft 30 increases, and the rotational speed of the drum 1 increases. When the rotating body 40 is rotated clockwise in the figure, the above is reversed, and the rotational speed of the driven shaft 30 decreases, making it possible to slow down the rotational speed of the drum 1.

In this embodiment, by freely changing the inclination angle of the rotating body 40, the rotation speed of the drum 1 can be changed continuously. Although the fourth embodiment is not shown in the drawings, since this embodiment uses an AC motor as the drive source for the drum 1, the DC motor 7 shown in FIG. 1 may be replaced with an AC motor.

As the AC motor, for example, a synchronous motor, an induction motor, etc. equipped with a cage winding that rotates at a synchronous speed can be used, and the rotation speed N of these motors is expressed by the formula N=120fIp.

In this formula, FS is the frequency, and p is the number of poles (the number of magnetic poles). Therefore, if the number of poles p is constant, the number of rotations N is proportional to the frequency f. By controlling and adjusting the frequency f using a commonly known method, the number of rotations of the AC motor can be changed, and the number of rotations N can be proportional to the frequency f. It is possible to convert the rotation speed of 1.

The number of rotations of the drum 1 can be changed by each of the embodiments described above, and the speed change mechanism for changing the number of rotations of the drum 1 is not necessarily limited to each of these embodiments, and various types can be adopted. can.

Further, in the first embodiment, the speed change mechanism of the movable table 14 is configured using a DC motor or a pulse motor, but this speed change mechanism is not limited to this. For example, a mechanical mechanism may be adopted, and each implementation We can use this as an example.

In the above description, the mimeograph paper is used to transfer display items from manuscript paper, but the present invention can also be applied to a facsimile plate-making machine that uses a plate such as an offset master plate.

As is clear from the above description, according to the present invention, manuscript paper and
A printing plate such as a mimeograph paper or an offset master plate is wound around a drum, a reading means and a recording means are moved in the length direction of the rotating drum, and the original paper and the printing plate are scanned by the respective means. In the plate-making method in which the plate-making work is performed, the rotation speed of the drum is made variable, and the plate-making work is performed by changing the rotation speed.
In addition to the linear density, it is now possible to change the rotational speed of the drum according to the required resolution, and it is now possible to adjust not only sub-scanning but also main scanning, which was not possible in the past. It becomes possible to perform plate-making work with one plate-making machine according to various resolutions.

Further, according to the present invention, an embodiment is provided in which a DC motor is used as the drive source of the drum, and the rotational speed of the drum is changed by controlling the voltage of this motor. The rotation speed of the drum can be changed. Furthermore, according to the present invention, an embodiment is provided in which a transmission mechanism composed of large and small diameter gears is interposed between the drum and the drive source that rotates the drum, so that the rotation speed of the drum can be changed by selecting the large and small diameter gears. You can switch in stages.

Furthermore, according to the present invention, an embodiment is provided in which a variable diameter pulley is used as a speed change mechanism for the drum, so that the rotational speed of the drum can be changed in a continuously variable manner by using the variable diameter pulley.

Furthermore, according to the present invention, an AC motor is used as a drive source for the drum, and by controlling the frequency of this motor, the number of rotations of the drum can be changed. It exhibits various features such as being able to construct a drum speed change mechanism using an electrical method with a relatively simple structure, and is highly practical.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the basic structure of the first embodiment of the present invention, FIG. 2 is a diagram showing only the main parts of the second embodiment, and FIG.
The figure shows only the main parts of the third embodiment. In addition, in the drawing, 1 is a drum, 2 is a manuscript paper, 3 is a mimeograph paper, 7
is a DC motor, 15 is a reading means, 16 is a recording means,
21a, 21b, 22a, 22b are large and small diameter gears, 32,
33 is a variable diameter pulley 7.

Claims (1)

[Claims] 1. A document sheet and a plate such as a mimeograph or an offset master plate are wound around a drum, and a reading means and a recording means are moved along the length of the rotating drum. In the plate-making method, the number of revolutions of the drum is variable, and the number of revolutions of the drum is varied depending on the required resolution. A plate-making method for a facsimile plate-making machine, characterized in that the facsimile plate-making machine rotates. 2. The facsimile plate making machine according to claim 1, characterized in that a DC motor is used as a drive source for the drum, and the rotation speed of the drum is changed by voltage control of the DC motor. Plate making method. 3. In claim 1, a transmission mechanism including large and small diameter gears is interposed between the drum and the drive source of the drum, and the rotation speed of the drum is changed by switching the large and small diameter gears. A plate-making method for a facsimile plate-making machine characterized by: 4. In claim 1, a speed change mechanism including a variable diameter pulley is interposed between the drum and a drive source for the drum, and the rotation speed of the drum is changed by the variable diameter pulley. A plate-making method for a facsimile plate-making machine characterized by the following. 5. The plate-making method for a facsimile plate-making machine according to claim 1, characterized in that an AC motor is used as a drive source for the drum, and the number of revolutions of the drum is changed by controlling the frequency of the AC motor. .