JPS58124657A - Detector for abnormal printing of fed paper rotary printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device +lIK that automatically detects printing abnormalities such as run-in and printout in a sheet-fed rotary printing press.

A sheet-fed rotary printing press is equipped with printing cylinders such as an impression cylinder, a blanket cylinder, and an intaglio cylinder.When paper is fed between the impression cylinder and the blanket cylinder and between the impression cylinder and the intaglio cylinder, Only in K, cylinder insertion is performed to apply printing pressure between each cylinder.This prints the pattern on the paper, and when the paper passes as the can cylinder rotates, the printing pressure is removed. It is supposed to be removed.

For this reason, accurate loading occurs only when paper is interposed between the impression cylinder and the blanket cylinder and between the impression cylinder and the intaglio cylinder, and no problems occur, but in large printing presses Because the control of body insertion and side extraction is performed by a hydraulic mechanism,
Due to changes in printing press operating speed or operating load, etc.
An error occurs in the timing of dosing or side extraction, causing the printing ink to adhere to the impression cylinder, or unprinting with no printing on the paper at all, or printing only partially on the paper. This resulted in a semi-reprint in which the work was carried out.

Therefore, in unprinting or semi-unprinting, it is necessary to dispose of the paper, while in taming, the impression cylinder must be cleaned because the back side of the paper is smudged by ink that adheres to the impression cylinder. It has become necessary to detect these abnormal printings, but conventionally, abnormal printing was monitored visually, which made it difficult to detect abnormal printing, resulting in delays in taking countermeasures and However, there are disadvantages such as increased mental burden on the operator.

The purpose of the present invention is to fundamentally solve the drawbacks of the conventional printers.The present invention detects the insertion of the printing cylinder using a mesh detector, and also uses a pulse generator to generate synchronizing pulses in accordance with the operation of the printing press. This is an extremely effective sheet-fed rotary printing press that detects the relationship between the operating conditions and the timing of screen insertion based on these detection forces and synchronized pulses, and obtains a signal indicating abnormal printing. The present invention provides an abnormal printing detection device.

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

FIG. 1 is a schematic side view of a dry offset intaglio printing machine showing an example of a sheet-fed rotary printing machine. Paper 2 fed from a feeder part 1 is fed onto a feeder board 3. The position is regulated by a prefix (not shown in the figure) provided at the tip of the paper, and the paper is passed between the first paper transfer jPi1s and the second paper transfer drum 6 by the swing claw of the swing device 4, and is passed through these. Further, after being passed to the impression cylinder claw of the impression cylinder 7 and subjected to printing on the blanket cylinder 8 and the intaglio MII 19, the paper is conveyed to the claw pole of the discharge belt 10, and is transferred to the first pile of the delivery section 11. is discharged to the second pile 11b.

Further, a number cylinder 12 having numbering is provided opposite to the second paper transfer cylinder 6, whereby a management number is printed on a surface opposite to the surface printed by the blanket cylinder 8 and the intaglio cylinder 9. It has become something that

In addition, 138 to 13d are dry plate cylinders that transfer the pattern to the rubber #I8, and 148 to 14c are intaglio cylinders that transfer ink to the intaglio cylinder 9 according to the pattern, and correspond to these cylinders. Due to this, the impression cylinder 1. The rubber cylinder 8 and the intaglio cylinder S are
It has a quadruple cylinder that can print four designs in one rotation.

A photoelectric paper detector PPD that receives transmitted light is provided near the impression cylinder 7 side of the paper discharge belt 10, and this detects the presence or absence of the paper l that has passed through the printing cylinders 1 to 9. There is.

FIG. 2 shows the configuration of a body insertion detector used to detect body insertion, and in the case of the figure, pressure Jilt? The eccentric bearing 2.1 supporting the connecting rod 22 and the lever n.

24 to face the actuator 26 of the hydraulic cylinder 25 which is rotated in the direction of the arrow, and a proximity switch 27 is provided so that when the g, b, y actuator 26 protrudes in the direction of the arrow I, the head of the actuator 25 is placed in the vicinity. Detection is performed by a switch 27.

In addition,! The parts shown in Figure 2 are what is commonly known as ``an eccentric body loading device''.

FIG. 3 is a block diagram showing a pulse generator for generating synchronous pulses according to the operation of the printing press, and shows the configuration of each printing cylinder 7 to
In addition to providing a cam plate 31 as a proximal body connected to one of the cam plates 9 and 9, a proximity switch 33 is provided opposite the protrusion ms'i of the cam plate 31. It is designed to extract pulses.

Note that the width of the protrusion 32 is determined in relation to the overall length of the paper 2 in the vertical direction.

Further, according to the configuration shown in FIG. 3, a number of synchronization pulses equal to the number of printed sheets can be obtained in response to one revolution of the printing cylinders 7 to 8 that print four patterns on J-th pattern.

In Figure 4, each piece 5.6.in which one revolution corresponds to one symbol.
12. This is a block diagram of a pulse generator used for extracting synchronization pulses from 13a to 13d, 14a to 14c, etc.A series of protrusions 32 corresponding to the total length of the paper 2 in the vertical direction are attached to the cam plate 31. A proximity switch 33 is provided opposite to this.

Therefore, in this case as well, a number of synchronization pulses equal to the number of printed sheets can be obtained.

Figure 5 is a block diagram of the electric circuit, Figures 6 to 8 are
What is strange about the timing chart showing the waveforms of each part in FIG. 5 is that when the body insertion is normal, as shown in FIG. 6, the signal 0) indicating abnormal printing is not sent out.

That is, in FIG. 5, the detected power (1) of the body insertion detector DID is inverted by the inverter INl, becomes a signal, and is then applied to the AND gate G1, and is also applied to the pulse generator PG. The synchronizing pulse (C) from is also given to the same gate Gl, and the two are matched, and
Sent as output (d).

Output (the mountain is the first flip-flop circuit (hereinafter referred to as FFC)
) FFI is set by human power S, and FFC-FFl is set by this IK, but it is a differential pulse obtained by differentiating the leading edge of the synchronizing pulse (C) by a differentiating circuit DFl. (e) is given to reset human power h1
Since reset has priority, depending on these relationships,
produces an output (f).

On the other hand, the detected force (a) of the body insertion detector DID matches the synchronization pulse (C) in the human ND game) Gs, and the output (2) is the reset input of the second FFC-FF5. In addition to being given to R, the differential pulse (→ is also given to the set human power S), and the kneading is also given priority to reset, so from these relationships, FFC/FFs outputs the inverted output (b). In addition, the synchronous pulse (C) is inverted by the inverter IN2, and the leading edge is differentiated by the differentiating circuit DFsK), and as a result, the synchronous pulse (C)
A differential pulse (i) synchronized with the trailing edge of is obtained.

Output (0, inverted output (b) and differential pulse (i) Fi
, are applied to the AND gate Gs as a gate circuit, and when these match, a signal U) indicating abnormal printing is generated. In the case of FIG. 5, the output (f),
The timings of the inverted output (h) and the differential pulse (i) do not match, and the signal (j) is not generated.

Figure 7 shows the case where the timing of the thrusting is early, and the normal state shown by the chain line in the same figure (!O). , the phase relationship with the synchronizing pulse (C) changes, and as shown in the figure, the output (0), the inverted output (b) and the differential pulse (I) are generated.
It passes through the gate Gs and a signal U) is sent out, whereby the occurrence of abnormal printing is detected.

Fig. 8 shows a case where the timing of the body insertion is delayed, and if the detection force (1) as shown by the solid line occurs in the same figure (in contrast to the normal state shown by the chain line in the stem), the synchronization pulse (C ) is as shown in the figure, and the relationship shown in the figure is the output (0, inverted output (h) and differential pulse (i
) occurs, and due to their coincidence, the differential pulse (i) becomes AN
If the signal 0) is sent because the signal passes through the D game) Ga, the occurrence of abnormal printing is detected as in FIG. 6.

In Fig. 5, the signal U) is differentiated by the differential pulse (1
) A shift register 8R is provided to shift the signal 0) by the paper 2 to the paper detector PP.
The shift was made to correspond to the situation in which it was transferred to D, and
ND gates G4 and G6, and the same gates G4. A differential pulse (i) is given to G6, and the detection force of the paper detector PPD is an AND game) Gs
Then, a signal obtained by inverting the quantity detection force by an inverter INs is applied to an AND game G4.

Therefore, the time when paper detector PPD detects paper 2 and
If the output of the shift register 8 ft and the differential pulse (1) match, it indicates that the paper 2 was unprinted between the printing cylinders 7 and 8 at the time of contact with the steel.
A signal Sr indicating unprinting is sent from gate G5.

Furthermore, if the point in time when the paper detector PPD does not detect the paper 2 and the output of the shift register SR and the differential pulse 0) coincide, it indicates that the paper 2 is not present at the time of insertion. A signal Sd indicating familiarity is sent out.

Note that the signals Sd and Sr are used to discharge normally printed sheets 2 to the first pile 11a, and to discharge sheets 2 that have been abnormally printed to the first pile 11a.
is used for controlling discharge to the second pile 11b, etc.

In addition, in FIG. 5, a reset circuit R8 such as a reset switch is provided, and the shift register 8R is reset by kneading to set the initial state.

Therefore, it is possible to automatically detect an abnormality in the feeding timing of the paper 2 and to take measures such as automatically classifying the paper 2 on which abnormal printing has been performed from the normally printed paper 2. .

However, the configurations shown in FIGS. 2 to 4 can be arbitrarily selected depending on the conditions. It can be freely transformed.

As is clear from the above description, according to the present invention, abnormal printing such as printing on the cylinder side or unprinting is automatically detected, automatic stopping of the printing press, automatic sorting of printed sheets, etc. are optional. It achieves labor saving and reliable detection of abnormal printing, and has a remarkable effect on various sheet-fed rotary printing machines.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a schematic side view of a dry offset intaglio printing machine, Fig. 2 is a diagram showing the configuration of a cylinder entry detector, and Figs. 3 and 4 are diagrams showing a pulse generator. Figure 5 is a block diagram of the electric circuit, and Figures 6 to 8 are diagrams showing the configuration.
FIG. 6 is a timing chart showing waveforms of various parts in FIG. 5. FIG. 2・φ・・Paper, 7＊＊＊Bite cylinder, 8・・Rubber cylinder,
9 bones...intaglio cylinder, 25 pieces...hydraulic cylinder, 26...
-II group actuator 27, 33...proximity switch, 31, 0-, cam plate, 32 working, +1 writing protrusion, PI
D...Body entry detector, PPD...Kenshi detector, PG
...-Pulse generator, S-type shift register,
GtxGs...AND gate, INI~INs...
・・Inverter, FFI, FFl-5s*FFc (7 lip-flop circuit), DFl, DFII ・・Differential circuit, (j) ・・Signal. Patent applicant Komori Printing Machinery Co., Ltd. Agent Kazu Yamakawa 4m1 (and 1 other person)

Claims (1)

[Claims] In a sheet-fed rotary printing press that inserts a printing cylinder in accordance with the supply of paper, a cylinder insertion detector that detects halftone printing on the printing cylinder, and a pulse generator that generates a synchronization pulse according to the operation of the printing press. , a signal obtained by inverting the detection force of the body insertion detector, and the synchronization pulse -! :! a first flip-flop circuit that is set in response to LK and reset in response to the leading edge of the synchronization pulse; A second flip-flop circuit that is reset in response to coincidence with the pulse, and abnormal printing due to coincidence of the output of the first flip-flop circuit and the inverted output of the second flip-flop circuit with the trailing edge of the synchronization pulse. 1. An abnormal printing detection device for a sheet-fed rotary printing press, comprising: a gate circuit that sends a signal indicating .