JPS5914959A - Marking apparatus for web rotary press - Google Patents

Abstract

PURPOSE:To provide the titled apparatus which facilitates the selection of a poorly printed part by automatically detecting errors in the registering between colors and then, performing an automatic marking for the affected part of a paper to indicate deficiency. CONSTITUTION:A paper 1 is printed in multiple colors with printing units 2a- 2d. Then, it is passed through a dryer 5, cooled with cooling drums 6a-6c and discharged to a folding machine through rollers 7a-7m. After registering errors are detected with a detector 12 provided near the cooling drum 6a, a corresponding pattern is passed through a marking mechanism 13 near the roller 7m, while a marking is done to indicate deficiency along with an alarm indication.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paper web rotary printing press for multicolor printing, in which when a printing registration error occurs between each color, marking is performed on the paper surface where the registration error has occurred, and the registration error is corrected. This invention relates to a marking device for a web-fed rotary printing press that clearly indicates the following.

Conventionally, when a registration error occurs, it is simply corrected automatically, and defective printed matter due to a registration error is visually judged and then sampled, which requires labor and time. However, there were drawbacks such as individual differences in judgment of defects.

The present invention has the purpose of fundamentally eliminating such drawbacks of the conventional technology, and after automatically detecting the registration error between each color, automatically marks the part of the paper where the registration error has occurred to indicate a defect. The present invention provides an extremely effective marking device for a paper web rotary printing press.

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

FIG. 1 is a side view showing the configuration of a web-fed rotary printing press;
The paper 1 fed out from the paper roll passes through printing units 2 & -2d that print the first to fourth colors individually, and is printed on both sides by the respective upper blanket cylinders 3a-3d and lower blanket cylinders 4a-4d. After receiving multicolor printing, the ink is dried by the drying device 5, and after being cooled by the cooling cylinders 6a to 6C, the paper is discharged to a folding machine (not shown in the figure) via roller groups 7a to 7m. I'm thinking about things.

Further, in each printing unit 28 to 2d, upper plate cylinders 8a to 8d and lower plate cylinders 9& to 9d are provided in pressure contact with the upper blanket cylinders 3a to 3d and the lower blanket cylinders 4a to 4d, and are not shown in the figure. The pattern is transferred to each rubber cylinder 3a-3d, 4a-4d while receiving ink supply from the ink roller.

In addition, the upper plate cylinders 8a to 8d and the lower plate cylinders 9a to 9d,
Motors 101L to 10d for correcting the upper and lower registers and motors 11a to 11d for correcting the lower registers are provided, and each motor 1Oa to 10d, 11a to
11d performs forward or reverse rotation, and each unit 2a to 2
The registration error is corrected for the upper and lower positions at the same time every d.

On the other hand, in the vicinity of the cooling cylinder 6a, a detector 12, which will be described later, is provided so as to face the paper 1, and detects register marks of any two colors among the register marks of each color, which will be described later, almost simultaneously. A marking mechanism 13, which will be described below, is provided near the roller 7m.

FIG. 2 is a schematic side view of the marking mechanism, in which a marking roller 23 is rotatably supported by an arm 22 which is biased upwardly in the figure by a spring 21. When the tip of the arm 22 is attracted by the excitation of the solenoid 24, the marking roller 23 moves to the roller 7.
Since it is pressed against the paper 1 on the paper 1 and rotates while being supplied with ink from the ink supply section 25, the margin portion of the paper 1 is marked.

FIG. 3 is a plan view showing the printing status of the register mark, in which a pattern printing area 1& is provided in the center of the paper, and the first to fourth colors are provided in the -side margin area 1b. When the register marks 301 to 30d pass through each printing unit 2a to 2d, they are printed at the same time as the pattern, and if the registration error in each printing unit 2a to 2d is zero, each interval t is They are equal.

FIG. 4 is a block diagram of the control circuit, and the detector 12 is composed of a light source and a pair of light receiving elements PDa and PDb, and the light receiving points of the light receiving elements PDa and PDb are located at the distance t and the cape in FIG. Since the two colors in the register marks 30 to 30d are detected almost simultaneously, if the registration error is zero, each light receiving element P
The detection outputs of Da and PDb are generated simultaneously, and if there is a registration error, a time difference will occur between the detection outputs of the respective light receiving elements PDa and PDb.

These detection outputs are input to an input section IDa of an amplifier or the like.

A gate pulse PG is applied to the time difference detection unit TED via IDb and is applied from a pulse generator such as a rotary encoder connected to any of the rotating parts in FIG.
is extracted according to the time difference, and the time difference is detected.
After it becomes a pulse signal according to the time difference, it is applied to the integrating section INT.

In the integrating section INT, noise components are removed, etc., and the pulse signal is given to a frequency dividing section DV such as a counter, and the frequency-divided pulse signal is given to a distributing section DIS via an output section oD. , are distributed to the motors 101-1 in FIG.
0a and 111 to 11a as a register error correction signal.

Note that the frequency divider DVO frequency division number is determined according to the transfer length of the paper 1 between the detector 12 and the marking mechanism 13 in FIG. It is provided on the downstream side of the paper 1 separated from the detector 12 by the transfer length of the paper 1, which is the frequency division number of the plate cylinder DV multiplied by the circumferential length of the plate cylinders 81 to 8d and 9a to 9d. .

That is, JI8. Taking a B-plate printing machine as an example, plate cylinder 8
Since the circumference length of a to 8d, 9a to 9d is 546u, when the number of divisions of the frequency divider DV is 8, 546X 8-43
The distance between the detector 12 and the marking mechanism 13 is determined by 68 mm on the transfer length of the paper 1.

On the other hand, the output of the branch section DV via the output section OD is applied to the delay circuit DL using a timer or preset counter, where it is held for a predetermined period of time, and this held output is sent to the solenoid 24 in FIG. , the marking mechanism 13 operates continuously for a predetermined period of time,
Marking with a specific color is performed on the register marks 30&-30d in FIG.

Incidentally, the output of the delay circuit DL is also supplied to a display section DI''K such as a lamp or a buzzer, and an alarm is displayed simultaneously with the marking.

However, the retention period of the delay circuit DL is determined according to the time it takes for all of the patterns detected to have a one-registration difference to pass through the marking mechanism 13.

Therefore, when a pattern whose registration error has been detected by the detector 12 passes through the marking mechanism 13, it will receive a marking indicating a defect, and at the same time a warning will be displayed, so the operator must respond to the warning. The machine enters a standby state, and the marked patterns can be selected as defective products.

In addition, input parts IDa, IDb, time difference detection part 'I'
ED.

The details of the integral part INT, output part OD, etc. are disclosed in the "Automatic Registration Adjustment Device for Multi-Color Printing Machine" (Japanese Patent Application No. 114273/1982) filed separately by the present applicant.
The explanation will be omitted.

However, the configuration shown in FIG. 2 can be arbitrarily selected depending on the situation, and the same can be said even if the display section DP in FIG. 4 is omitted, and the present invention can be freely modified in various ways.

As is clear from the above explanation, according to the present invention, when a registration error occurs, the corresponding part of the paper is automatically marked, making it easy to sort out the defective part of the paper. Remarkable effects can be obtained in rotary printing presses for multicolor printing using

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view showing the configuration of a web rotary printing press, Fig. 2 is a schematic side view of the marking 7-mechanism, and Fig. 3 is a plane showing the printing situation of register marks. 4 are block diagrams of the control circuit. 1...Paper, 8a-8d...Middle upper plate cylinder, 9a-9
d... Lower plate cylinder, 12... Detector, 13...
Marking mechanism, 21... Spring, 2211...
-・Arm, 23...Section marking roller, 24・s
e Solenoid, 25... Ink supply section, 301
~30d...Register mark, L a * e *
Light source, PDa, PDb """-light receiving element, TE
D...Time difference detection section, Dv...Division section, DL.
...Delay circuit. Patent Applicant Komori Printing Machinery Co., Ltd. Agent Kazuka Yamakawa (and 1 other person) 8- ε ♀Sa. yo 8 to □ ma - hee'--a 0 ward o': i 3R32 castle to 8, %F) J 8a call Sρε

Claims (3)

[Claims] (1) A detector that detects two color register marks on the paper surface almost simultaneously, and the detection output of the detector
a time difference detection unit that detects a time difference between color register marks; a frequency divider that divides the output of the time difference detector;
a marking mechanism for marking the paper surface provided on the downstream side of the detector separated by a paper transfer length obtained by multiplying the frequency division number of the frequency divider by the circumference length of the plate cylinder; 1. A marking device for a web-fed rotary printing press, comprising: a delay circuit that holds the output of a frequency generator for a predetermined period of time and operates the marking mechanism for a predetermined period of time based on the held output. (2) The marking device for a paper web rotary printing press according to claim 1, characterized in that a timer is used as the delay circuit. (3) The marking device for a paper web rotary printing press according to claim 1, characterized in that a preset counter is used as the delay circuit.