JPH01203139A - Automatic discharge device for register failure section - Google Patents

Abstract

PURPOSE:To correctly grasp a register mark failure folded page, and automatically discharge correctly only the said defective by calculating discharge start timing from a folded page number detection signal and a discharge start number set value. CONSTITUTION:When register mark failure is detected in a print unit U7, the register mark failure is inputted into an A/D converter 7, converted into a digital quantity, and inputted into a controller 8. The controller 8 judges the quantity of the register mark failure for within an allowable value, and when exceeding the allowable valur, calculates the discharge number of a folded page in which the register mark failure arises. Then discharge start timing is calculated. Individual folded pages are proceeding successively in this time, the proceeding situation is grasped with a folded page number detector 6 and an output pulse counter, and it is waited that the first register mark failure folded page reaches a reject device 10. On reaching, a drive order of a reject cylinder 13 is sent from the controller 8 via a digital output device 21, a rejection lever 19 falls, and individual register mark failure folded page is discharged to a discharge belt side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a publication printing machine, and more particularly to an automatic discharge device for misregistered signatures in a multicolor printing machine for gravure printing.

[Conventional technology]

In the case of a gravure printing machine, multiple printing units of different colors are arranged in a line, and a folding machine is placed in the final process section to form signatures, which are sequentially sent out from the delivery section via a conveyor. It has become. Since gravure printing is performed in multiple colors, misregistration (hereinafter referred to as misregistration) is a key factor in print quality. For this reason, the folding machine and each printing unit are equipped with a misregistration detector.7 In the conventional method of ejecting misregistered signatures, the detection signal from the misregistration detector exceeds a predetermined tolerance value. If this occurs, the operator is notified by an alarm buzzer or the like, and the operator manually discharges the defective signatures from the time the alarm occurs. If the operator does not determine that the signatures flowing through the process where the sampling inspection was performed are within the non-defective range, the ejection is manually stopped.

[Invention or problem to be solved]

The problem with conventional methods for discharging misregistered signatures is that the number of defective copies and the discrimination between non-defective and defective copies are not always accurate because the method relies on the operator's judgment. As a result, there is a problem in that originally good products are discharged as defective products, or conversely, defective products are mixed in with non-defective products. In addition, since the operator was busy doing other work during the period -i, the judgment of the quality of the signatures was inaccurate, and there was a high possibility of an accident in which a defective product was mixed into a good product.

SUMMARY OF THE INVENTION An object of the present invention is to provide a discharging device that can accurately grasp misregistered signatures and correctly and automatically discharge only the defective products.

[Means to solve the problem]

In order to solve the above-mentioned problems and achieve the object of the present invention, the present invention includes a plurality of printing units, a folding machine that creates signatures from the printed paper printed by these printing units, and a A publishing printing machine comprising: a feed-out unit that sequentially sends out pages; a misregistration detector that detects the occurrence of misregistration in each of the printing units; and a signature copy number detector that examines the number of copies produced. The number of copies to be ejected is calculated from the time between the occurrence and end of the review failure detection signal and the signature number detection signal, and the ejection start timing is calculated from the signature number detection signal and the ejection start number set value. , a control unit that outputs a discharge control command to discharge the number of misregistered signatures at the timing, and a reject 1 to device that discharges the misregistered signatures from the sending unit according to the discharge control command. It is characterized by this.

[Effect]

According to the above configuration of the present invention, the misregistration detector detects misregistration in each printing unit. Further, the signature number detector detects the number of signatures created.

The controller calculates the number of copies to be ejected from the misregistration detection value and the signature number detection value, and the ejection start timing from the signature number detection value and the ejection start copy number setting value. Then, the control section controls the reject device based on this calculated value, and can accurately and automatically eject only the misaligned folds T that should originally be ejected.

〔Example〕

Next, embodiments according to the present invention will be described based on the drawings.

An embodiment is shown in FIG. 1, and each part will be explained.

The Dutsuki Publishing printing press consists of eight printing units U1 to U8 arranged in line along the flow direction of printing paper 1, a folding machine 2 installed at the final stage, and a folding machine 2. It is configured to include a conveyor 4 that sequentially carries out the produced signatures 3, and a delivery section 5 that delivers each of the signatures 3 that have been carried out.

−Bow　　　− Next, the printing operation will be explained.

A sheet of printing paper 1 is fed from a paper feed roll (not shown) and printed along a path indicated by a broken line arrow while being fed at a predetermined speed (for example, 60 rpm).

That is, first, the back side is printed in four colors by the fifth printing unit U5 to the eighth printing unit U8, and then it is reversed and the fourth printing unit
After the front side is printed in four colors by the printing unit U4 to the first printing unit U1, it enters the folding machine 2. The folding machine 2 folds the printed paper according to the printing mode (two-sided printing, one-sided printing, etc.) to create individual signatures 3. Each signature 3 is sequentially sent to a delivery section 5 by a delivery conveyor 4, and sent to the next process.

Automatic discharge device The automatic discharge device according to the present invention can be roughly divided into a detection section that detects events in each part, a control section that performs calculations and measurements based on the detection signal and outputs a control signal, and a control section that receives the control signal. It consists of a scraper and a rejecter for discharging misregistered signatures. Each will be explained separately below.

The detection unit is a first misregistration detector A provided in the folding machine 2,
It is provided with second to eighth misregistration detectors A2 to A8 installed in each of the printing units U to U8, respectively, and a signature copy number detector 6 provided in the sending section 5.

The first to eighth misregistration detectors A to A8 detect the gap between the register marks (not shown) printed simultaneously on the edge of the printing paper, and output the amount of misregistration as an analog signal.

The signature number detector 6 uses a proximity switch or the like to output a signature number detection signal N in the form of a pulse signal each time each signature 3 passes close to each other. The number of pulse signals thus corresponds to the number of signatures passed.

In the control section, the A/D converter 7 is connected to each misregistration detector A.
The detection signals SA1 to SA8 of 1 to A8 are converted into digital values and input to the controller 1 to the roller 8. This A/D converter 7 inputs each of the misregistration detection signals SA1 to SA8 in an OR logic state to the controller 8, and each misregistration detection signal S
It operates when any one of A1 to SA8 indicates misregistration.

The misregistration judgment reference value setters R8f1 to Ref8 are configured to set the misregistration judgment reference values (tolerable values) SRef1 to SR8, 8 for each of the printing units l-U1 to U8 individually. This is a digital input setting device consisting of the same number of setting devices as U8. Each of the setting signals 5Ref1 to 5Ref8 is input to the controller 8 via the digital input device 9.

Ejection start copy number setting devices B to B8 are for each printing unit U.
The number of signatures that appear before reaching the misregistered signature ejection device 10 when misregistration occurs in the printing units U1 to U8 is set for each of the printing units U1 to U8. Since the next signature after this number of signatures has elapsed will be a misregistered signature, it can be said that it corresponds to the number of copies to start discharging. This number of copies to start discharging is actually a value determined experimentally and may vary to some extent.

Therefore, a correction input setting device Bo for the set value of the number of copies to start discharging is provided.

The error confirmation time setting device C is for checking whether the detection signals SA1 to SA8 from the first to eighth misregistration detectors A to A indicate the occurrence of true misregistration. . In order to prevent malfunctions due to the mixing of disturbance noise, if the misregistration detection signals SA1 to SA8 continue for a certain period of time or more, they are treated as true detection signals. Error confirmation time T. is determined and set experimentally.

The above-mentioned discharge start copy number set values S81 to S88 and error confirmation time set value TC are input to the controller 8 through the digital input setter 11.

The signature number detection signal N is input from the signature number detector 6 provided in the sending section 5 to the controller 8 through the digital input device 12.

D is the relay contact for the operation stop signal of this automatic discharge device,
For example, it is turned on when the printing press speed is 60 rpIII or more, and turned off when it is less than that. Further, E is a reset button for canceling all current setting signals. This is for resetting each setting value when changing print specifications.

Next, a description will be given of the controller 8 that operates based on the above setting signals and detection signals. The controller 8 receives each misregistration detection signal SA1 to SA8 and an error confirmation time setting value T. A misregistration confirmation process 100 for confirming the authenticity of a defect by which comparison, each misregistration detection signal SA1 to S, 8, and each misregistration judgment reference value 5Ref
A misregistration judgment process 101 that determines whether the misregistration that has occurred is within an allowable range by comparing with t~5Ref8, and a misregistration judgment process 101 that determines whether the misregistration that has occurred is within the allowable range, and the discharge process from the time when the misregistration detection signals SA1 to SA8 are generated to the time when they are finished. A discharge number calculation process 102 calculates the number n of misregistered signatures by counting the signature number detection signal N, and calculates the number of misregistered signatures by comparing the signature number detection signal N and the discharge start number set values 881 to S88. A discharge start timing control process 103 that calculates the discharge start timing of sheets, and an execution process that gives a discharge operation command to the driving relay contact of the paste reject cylinder 13 of the reject device at the calculated discharge number timing for the calculated number of copies to be discharged. 104.

Next, FIG. 2 shows details of the reject device.

= 10 = As shown in FIG. 2, signature 3 is transported on the transport table 14
are sandwiched between the upper rotating belts 1 to 15 and the lower rotating belt 16, and good products are delivered to the carrier 17 via the delivery bells 1 to 16. A girder cylinder 13 is provided on the upper end side of the lower belt 15, and its piston rod 18
At the tip of the screw 1, there is provided an ejector lever 19 that moves upward and upward as the screw rod 18 expands and contracts. When the reject cylinder 13 is driven, the reject lever 1
The direction of the misregistered signature 3 that has fallen and been conveyed while being sandwiched between the upper rotating belt 14 and the lower rotating belt 15 is discharged to the defective product delivery belt 20 side. Note that the eject lever of the ejected signature number detector 16
It is provided near the bottom of 19.

Next, the operation will be explained. Under normal conditions, as shown in FIG. 1, each printing unit U1 to U
The signatures 3 printed via the folding machine 8 and then folded by the folding machine 2 are sequentially delivered to the non-defective product delivery section 5 via the delivery conveyor 4.

Now, assume that misregistration occurs in the seventh printing unit U7. The misregistration is detected by the misregistration detector U7, inputted to the A/D converter 7, converted into a digital quantity, and inputted to the controller 1 to the roller 8.

The controller 8 executes the following processing according to the flow shown in FIG. First, it is confirmed in step 100 whether or not the detection signal A7 is a true detection signal. If there is an error, the process returns to the previous stage and waits for the next detection signal. If it is a true detection signal, the process advances to step 101.

In step 101, it is determined whether the amount of misregistration is within a tolerance value. If it is within the allowable value, return to the previous step and wait for the generation of another misregistration detection signal. If it exceeds the allowable value, the process proceeds to step 102.

In step 102, the number n7 of ejected copies of the misregistered signatures is calculated. Next, in step 103, the discharge start timing is calculated.

During this time, each signature advances sequentially, and its advancement status is monitored by the signature number detector 6 and its output pulse counter (not shown).
, and waits for the first misregistered signature to arrive at the reject device 10.

When the sending of the non-defective signatures existing between the printing unit U8 and the reject device after the printing unit U7 where the misregistration occurred is completed, and the first misregistration signature eject device 10 is reached, the digital signature is sent from the controller 8 in step 104. Reject cylinder 13 via output device 21
A drive command is issued, the reject lever 19 falls down, and each misregistered signature is ejected to the ejection belt 20 side. When the ejection of the number n7 copies is completed, one resi-lever lever returns to its original position, and non-defective signatures are sent out again by the delivery belt 16.

In the above embodiments, the controller 8 may be a so-called programmable controller or may be a microcomputer.

Further, the misregistration is not limited to either vertical misregistration or lateral misregistration.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to automatically calculate the number of misregistered signatures to be ejected, calculate the ejection start timing, and automatically eject only truly misregistered signatures. . As a result, it is possible to prevent defective products from being mixed with non-defective products. Furthermore, the determination of whether or not the product is defective and the determination of the number of copies to be ejected are not made arbitrarily by the operator, which improves the yield.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an enlarged view of the main parts of the beam ejecting device, and FIG. 3 is a flowchart showing the processing procedure of the controller. 1...Printing paper, 2...Folding machine, 3...Folding T, 4...
- Carrying out belt, 5... Sending unit, 8... Controller, 10... Reject device, A1 to A8... Misregistration detection device, Ref1 to Ref8... Misregistration judgment reference value setter, 81 ~B8... Discharge start copy number setting device, C
... Correction input setter, D... Error confirmation time setter, N... Signature number detection value, SA1 to SA8... Misregistration detection signal.

Claims (1)

[Claims] A publishing printing machine comprising a plurality of printing units, a folding machine that creates signatures from printed paper printed by these printing units, and a delivery section that sequentially delivers each signature. , a misregistration detector for detecting occurrence of misregistration in each of the printing units; a signature number detector for examining the number of produced signature copies; and a time period between the occurrence and end of the review defect detection signal; A discharge control command that calculates the number of copies to be discharged from the signature number detection signal, calculates the discharge start timing from the signature number detection signal and the discharge start number set value, and discharges the misregistered signatures of the number of discharged copies at the timing. 1. An automatic ejecting device for misregistered signatures, comprising: a control section that outputs misregistered signatures; and a reject device that ejects misregistered signatures from the sending section in accordance with the ejection control command.