JPS5812760A - Automatic regulator for front-back registering of double-sided rotary press printer - Google Patents

Abstract

PURPOSE:To separately control the rotation phases of both plate drums by a method in which register mark for each printing plate face, the rotation reference point of both plate drums, register mark after printing, and the standard point of printing are detected, and a regulating motor is actuated according to the phase difference between the detected outputs. CONSTITUTION:Register marks are provided on each printing plate face to be attached to an upper plate drum 13u and a lower plate drum 13d. Standard point detectors RSu and RSd to detect the rotation standard points of both plate drums are provided, and also a printing mark sensor PMS to detect the register marks after printing and a print standard point sensor PRS to detect the printing standard points is provided. According to the phase difference between the detected outputs of these, a regulating motor is actuated and the front-back allowance of double-sided printing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic front-rear register adjustment device for ensuring that double-sided printing by both upper and lower plate cylinders of a double-sided rotary printing press is performed normally in the front-rear direction, that is, in the rotational direction of both plate cylinders. It is related to.

Double-sided rotary printing presses use a continuous roll of paper, compared to sheet-fed printing presses that use entire sheets of cut paper.
Printing speed, pattern, and amount of ink.

Conditions such as the required amount of water supply and fluctuations in tension on the paper differ greatly, and these conditions can be ignored in sheet-fed printing machines.As a result, the front-to-back register during printing is not in a normal state, and the front-to-back registration during double-sided printing is difficult. Poor positioning occurs frequently.

However, conventionally, in order to correct defects in front-to-back registration, the situation after printing is corrected by visual inspection, which requires skill and has drawbacks such as the time required for front-to-back registration.

The present invention has the purpose of fundamentally solving all such drawbacks of the conventional art, and has the purpose of providing register marks on each printing plate surface attached to the upper and lower plate cylinders, and setting the rotation reference points of both plate cylinders individually. In addition, a print mark sensor is provided to detect the register mark after printing, and a print reference point (print reference point) output device is provided to detect all print reference points. Motor 'fr for adjustment according to the phase difference
The present invention provides an extremely effective automatic front-rear register adjustment device for a double-sided rotary printing press that controls the rotational phase of both the upper and lower plate cylinders individually.

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

FIG. 1 is a plan view of the printing plate, in which a plurality of register marks 3 are provided at equal intervals along the front-rear direction, that is, the vertical direction, in the peripheral margin 2 of the pattern 1.

FIG. 2 is a configuration diagram of the main parts of a double-sided rotary printing press, in which blanket cylinders 12u and 12d are pressed against both sides of paper 11 fed from the left side of the figure from both sides of the lower side of -F, and furthermore, the upper The plate cylinder 13u and the lower plate cylinder 13d are in pressure contact with each other, and the printing plate shown in FIG. 1 is wound and mounted on the upper and lower plate cylinders 13u, 13dK.

Therefore, the pattern 1 and register mark 3 of the printing plate are transferred to the rubber cylinders 12u + 12d, and also the paper 11
After double-sided printing is performed on the paper 11 at the same time, the paper 11 is transferred to the drying section 1.
4 through the cooling roller 15a.

15b (H) and is discharged via feed rollers 16a to 16e Th.

Further, the upper plate cylinder 13u and the lower plate cylinder 13dK are each provided with reflective light-receiving type mark sensors MSu, MSd facing the register mark 3, and the cooling roller 15a [in this case, the upper plate cylinder Print mark sensor PM that detects register marks printed by the printing plate of cylinder 13u
S is provided.

Note that the upper and lower plate cylinders 13u, 13d and the cooling roller 15alC have fixed driving bodies 17u, 17d, and 17a, the same number as the register marks 3 indicating mechanical rotation reference points and printing reference points. Reference point detectors R8u, R8d such as proximity switches and a print reference point detector PR8 are provided at opposing positions.

Figure 3 is a block diagram of the electric circuit.
The rain detection outputs from the side mark sensor MSu and the reference point detector R8u are fed to a phase difference detector PDDu such as a phase comparator, where the phase difference between the rain detection outputs is detected.
The rain detection output from the print 1 mark sensor PMS and the print reference point detector PR8 is also sent to the output unit 0TDu via the mixer MIXu and output from the same phase difference detector P.
After the phase difference is detected by DD, mixer MIXu
The signal is sent to the output section OTD u via f.

The output unit 0TDu generates a drive output according to the output value and polarity of the mixer MIX u, and drives the adjustment motor Mu that mechanically controls the rotational phase of the upper plate cylinder 13u. Motor M according to the phase difference between the rain detection outputs with the output device R8u and the phase difference between the rain detection outputs between the print mark sensor PMS and the print reference point detector MR8.
u rotates, mark sensor MSu and reference point detector R8u
It stops when the detection outputs of the print mark sensor FMS and the print reference point detector PR8 match in time.

In addition, the rain detection output from the mark sensor MSd on the lower plate cylinder 13d side and the reference point detector R8d is also output from the same phase difference detector PD.
The phase difference is detected by Dd, and the mixer MIXd sends it to the output section 0TDd along with the output of the phase difference detector PDD, and also drives the adjustment motor Md which mechanically controls the rotational phase of the lower plate cylinder 13d. The rotational phase is adjusted similarly to the upper plate cylinder 13u.

Therefore, the rotational phases of both the upper and lower plate cylinders 13u and 13d are automatically set based on the detection outputs of the reference point detectors MSu and MSd, and the rotational phases of the upper and lower printing cylinders 13u and 13d are automatically set based on the detection outputs of the reference point detectors MSu and MSd.
This is automatically set as the standard for all detection outputs of R8.
Registration adjustment in the front and back direction is automatically performed, and as shown in FIG. 4, a web 21 is generated on the paper 11 and the blanket cylinder 12d
Even if the pasting part 22 is formed on the paper, the front and rear registers are manually corrected, and double-sided printing without register errors is always continued.

However, each reference point detector R8u, Rad, PH
1, a rotary encoder or the like may be used, and the position of the print mark sensor PMS and the print reference point detector PR8 can be the same if they are selected on any roller through which the printed paper 11 passes. Various modifications are possible, such as detecting register marks printed on the lower surface of the paper 11.

As is clear from the following explanation, according to the present invention, since the front and rear abutments for double-sided printing are adjusted visually, stable and good double-sided printing can be easily performed, making it possible to use double-sided rotary printing machines for various purposes. It has a remarkable effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a printing plate, FIG. 2 is a block diagram of the main parts of a double-sided rotary printing press, FIG. 3 is a block diagram of an electric circuit, and FIG. 4 is a side view showing the state of web formation. 3...Register mark, 11...Fist paper, 12u
, 12d...Rubber cylinder, 13u...Upper cylinder,
13d... lower plate cylinder, 15m, 15b... cooling roller, λri Su, MSd... mark sensor, P
MS・・Life・Printing Mark Senza, R8u, R8d・
...-Reference point detector, PR8... Print reference point detector, PDDu, PDDd, PDD... Phase difference detector,
MIXu. MIXd...Mixer, Mu, Md...Adjustment motor. Patent applicant: Komori Printing Machinery Co., Ltd. Agent: Masaki Yamakawa (and one other person)

Claims (1)

[Claims] a register mark provided on the printing plate surface which is attached to the upper plate and the lower plate cylinder respectively, and a mark sensor individually provided opposite to each of the register marks on the upper plate and upper plate cylinder side; a reference point detector for individually detecting rotation reference points of the upper plate cylinder and the lower plate cylinder; and a reference point detector for detecting at least one of the register marks printed based on the upper plate cylinder and the lower plate cylinder. a printing mark sensor, a printing reference point detector that detects a printing reference point, a phase difference between the rain detection outputs of the mark sensor on the upper plate cylinder side and the reference point detector, and the printing mark sensor and the printing reference point detector. an adjustment upper that controls the rotational phase for the upper plate according to a phase difference between the rain detection outputs of the upper plate cylinder side, and a rain detection output of the mark sensor and the reference point detector on the upper plate cylinder side and the printing mark sensor. ff1lA! which controls the rotational phase of the lower plate cylinder according to the phase difference between the rain detection outputs of the rain detection outputs and the printing reference point detector; An automatic front-rear register adjustment device for a double-sided rotary printing press, characterized by incorporating an adjustment motor.