JPH0412222B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a plate-making machine that scans a manuscript and makes a plate on a mimeograph paper, and in particular, a technology that can automatically make a plate-making mark for vertical adjustment on a mimeograph paper. Regarding.

(Prior Art) A plate-making machine is known that scans a document to obtain time-series image information and uses this image information to make a plate on a mimeograph paper.

The mimeograph paper made by this plate-making machine is
Generally, it is wound around the printing cylinder of a rotary mimeograph machine as a base paper, and ink is transferred onto printing paper fed to the rotary machine.

By the way, in mimeograph printing using such a rotary press, the base paper wrapped around the rotating plate cylinder,
It is necessary to feed the printing paper so that it always overlaps between the plate cylinder and the press roller, and for this reason, during printing, the paper feeding device always maintains a constant phase difference and speed ratio with respect to the rotational movement of the plate cylinder. At the start of printing, adjustment to align the base paper and the printing paper as much as possible as described above, so-called vertical adjustment, is performed by changing the phase difference.

In conventional rotary mimeograph presses, this paper feeding device is constructed using a mechanical mechanism such as a planetary gear that utilizes the rotation of the plate cylinder, and the vertical adjustment is performed by changing the planetary gear etc. while checking the print finish. It was carried out on a trial basis.

However, in such conventional rotary rotary copying machines, when performing vertical adjustment on a trial basis, not only is it troublesome to adjust the vertical position, but it is also difficult to estimate the positional relationship between the base paper and paper from the configuration of the rotary rotary copying machine. Unfortunately, the printing paper may be wasted before the adjustment is completed, or the paper and base paper often do not overlap between the plate cylinder and the press roller, and printing is performed at a position where there is no paper. There were problems such as ink adhering to the press roller and staining the printing paper that was fed thereafter.

For this reason, it is conceivable to provide a detection means for detecting the position of the base paper relative to the plate cylinder at a suitable location in the rotary mimeograph press, and use this output signal to drive, for example, a paper feeder to automatically align the base paper and the printing paper. However, with conventional base paper, it is difficult to construct a means for detecting this.

Therefore, the present applicant has provided a detection mark (vertical adjustment mark) on the base paper as shown in Utility Application No. 60-35762, and by detecting this mark, the position of the base paper relative to the plate cylinder can be easily detected. We are proposing a base paper that can automatically adjust the top and bottom.

(Problems to be Solved by the Invention) However, the above-mentioned vertical adjustment marks are manually provided on the base paper after the base paper is made into a plate, and therefore, when attaching the vertical adjustment marks to the base paper, To do this, it is necessary to recognize in advance the parts of the base paper that have been plate-made, which is not easy, and the work of manually attaching the vertical adjustment marks to the base paper itself is troublesome. A problem arises in that it impedes work efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a plate-making machine that can automatically make a vertical adjustment mark while using a rotary copying machine, thereby improving the efficiency of the vertical adjustment work. be.

(Means for Solving the Problems) The present invention for solving the above problems is a plate-making machine that scans a manuscript 2 to obtain time-series image information and uses this image information to make a plate on a mimeograph paper 4. In,
The plate making machine includes detection means 9 and 11 for detecting image information located on the uppermost side of the original document 2, and detects the mimeograph paper 4 based on the output signals of the detection means 9 and 11.
Plate-making means 1 for making a plate-making mark 12 for vertical adjustment
1, 16, 8, and 10.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a block system configuration diagram of a plate making machine according to an embodiment of the present invention, and FIG. 2 is a diagram showing a manuscript and a mimeograph sheet to be scanned by the plate making machine.

Reference numeral 1 denotes a rotating drum that rotates at a constant speed, and the circumferential surface of the rotating drum 1 is biased to one side in the axial direction, and the document 2 is
The plate cylinder 3 is divided into two parts: a document cylinder 3 on which the original paper is wound, and a plate cylinder 5 on which the mimeograph paper 4 is wound on the other side. Further, a drive control device 6 for rotationally driving the drum 1 is provided on one side of the shaft of the rotating drum 1. A scanning drive device 8 and a counter 9 are sequentially connected to the drive control device 6, and operations are performed according to output signals from the drive control device 6.

Further, a reading device 7 is provided near the side of the document cylinder 3, and this reading device 7 reads the image on the document 2 by, for example, an optical, electrostatic, or electromagnetic method, and converts it into time-series image information. It receives signals from the scanning drive device 8 and performs reading and scanning of the original 2. Furthermore, a recording device 10 is provided near the side of the plate cylinder 5, and this recording device 10 inputs, for example, time-series image information from the reading device 7, and records the information on the mimeograph paper 4 based on this information. Printing is performed by electric discharge destruction, etc., and plate making is performed on the mimeograph paper 4 in synchronization with the reading scan of the reading device 7.

Further, the counter 9 calculates each scanning line 201, 202, . . . from the start of scanning of the original 2 by the reading device 7.
The time until the image information located at the highest position on the top is detected is measured by the output signal from the reading device 7. For example, a counter that counts high frequency pulses is controlled by the signal from the scanning drive device 8. It is configured to be driven from the start of each scan 201, 202... and to be stopped by an image signal located at the highest position on each scanning line 201, 202... detected by the reading device 7.

The numerical value (time) measured by this counter 9 is input to a rotation command device (control unit) 11 connected to the counter 9, and arithmetic processing is performed therein. This device 11 is composed of a microcomputer consisting of, for example, a microprocessor, a memory, and an interface, and upon completion of each scan 201, it compares the numerical values sequentially inputted by the counter 9, that is, compares the values sequentially inputted by the counter 9. Each scanning line 201, 202 starts from the start of reading scanning of the document 2 that is performed every rotation
...The time until the image information located at the highest position on the top side is detected is sequentially compared until the final scanning line is reached, the minimum time is obtained, and this time and a predetermined value (preset in the device 11) ( For example, the position at which the vertical adjustment mark is to be attached is calculated based on the offset value unique to the rotary press, and a command signal based on this calculated value is output to the scanning drive device 8. Then, the command signal input to the scanning drive device 8 causes the recording device 10 to move when the reading device 7 or the recording device 10 has sub-scanned the original 2 or the mimeograph paper 4 by a predetermined distance.
Place the vertical adjustment mark 1 in the appropriate place on the mimeograph paper 4.
2 (see Figure 2) is made into a plate.

Thus, the counter 9 and the rotation command device 11 constitute the detection means according to the present invention, and the rotation command device 11, the drive control device 6, the scanning drive device 8, and the recording device 10 constitute the vertical adjustment mark. This constitutes a plate-making means for plate-making 12.

Next, the operation of the above embodiment will be explained.

The original 2 is placed on the original cylinder 3 and plate cylinder 5 of the rotating drum 1.
After wrapping the mimeograph paper 4, the drive control device 6
Start. When the device 6 starts, the rotating drum 1 rotates, and a drive signal from the device 6 is output to the scanning drive device 8. Then, the reading device 7 and the recording device 10 are driven by the scanning drive device 8 in synchronization with the reading device 7, and the document 2 is read and scanned 201, 202, . . .
1,402... are performed.

On the other hand, the counter 9 is driven in synchronization with the start of each reading scan by this reading device 7, and each scanning line 20 is
1, 202... Count the high frequency pulses until the first image information is detected. This count value is sent to the rotation command device 11 every time each scanning line 201, 202... ends, and the minimum value of the count value is detected here, and based on this minimum value, the original paper 4 is The position at which the vertical adjustment mark should be made (for example, the position at a distance α from one end 4a of the base paper 4) is calculated.

This calculated value is then output to the scanning drive device 8. Then, when the reading device 7 or the recording device 10 sub-scans the original 2 or the mimeograph paper 4 by a predetermined amount, the recording device 7 scans α from the top side of the mimeograph paper 4.
vertical adjustment marks 12 (for example, four horizontal lines in Figure 2) at positions spaced apart by
is printed at a position above the right shoulder of the base paper 4.

As described above, according to the present invention, the vertical adjustment mark 12 can be automatically plate-made without manual work by the operator, and it is possible to reduce the workload of the operator and facilitate the work. .

(Effects of the Invention) As is clear from the above explanation, the plate making machine according to the present invention not only makes a plate of a mimeograph paper but also
The vertical adjustment mark can be automatically made into a plate, and the efficiency of the vertical adjustment work can be improved.

[Brief explanation of drawings]

FIG. 1 is a block system diagram of a plate-making machine according to an embodiment of the present invention, and FIG. 2 is a diagram showing a manuscript and a mimeograph sheet to be scanned by the plate-making machine. In the drawings, 1 is a rotating drum, 2 is a base paper, 4 is a mimeograph paper, 6 is a drive control device, 7 is a reading device, 8
9 is a scanning drive device, 9 is a scanning line counter, 10 is a recording device, 11 is a rotation command device (control unit), and 12 is a vertical adjustment mark.

Claims (1)

[Claims] 1. In a plate-making machine that scans a manuscript to obtain time-series image information and uses this image information to make a plate on a mimeograph paper, the plate-making machine detects image information located at the topmost side of the manuscript. A plate-making machine comprising: a detection means; and a plate-making means for making a vertical adjustment mark on the mimeograph paper based on an output signal of the detection means.