JPH0137274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate designation control device that can arbitrarily detect printed matter of a designated plate in a printing press having a multifaceted plate cylinder.

Conventionally, in printing machines equipped with a plate cylinder that holds only one plate, when checking the condition of the plate by proof printing, there is no problem because there is a one-to-one correspondence between the plate and the printed material. . In addition, in a multicolor printing machine equipped with multiple plate cylinders each having one plate, if you want to check the plate by proof printing, only the plate cylinder of the desired plate is loaded, and all other plate cylinders are turned off. If you print without printing, you can make a proof using only that plate.

On the other hand, when printing securities, etc., multi-color printing is sometimes performed using a single plate, and for this purpose, multiple inkers of each color are arranged around the plate cylinder, which takes up space and increases the length of the outer circumference of the plate cylinder. may require a large amount of In such a so-called double cylinder, which has a large outer circumference, a single plate would have excess outer circumferential surface, so it was decided to install multiple plates on one plate cylinder and use it as a multi-sided plate cylinder. Become. In addition, in an intaglio type printing press, a doctor device is disposed around the printing cylinder in addition to an inking device, so a multifaceted printing cylinder is also used.

However, in a printing press equipped with such a multifaceted plate cylinder, if it is desired to check each plate by proof printing, the plate cylinder must be attached and detached in an extremely short period of time. However, since polygon printing cylinders are generally heavy, it is difficult to attach and detach the cylinders in a short period of time, and if this is done forcibly, the durability of the machine will be impaired. Therefore, proof printing is performed by continuously passing through the paper, but in this way it is impossible to know which printed matter was printed by which plate. Normally, even if multiple plates are the same, there may be differences in shading due to differences in the construction of the plates, registration errors may occur due to differences in the mounting position of the plates, or there may be dust attached to the prints. There will be some differences. For this reason, it is necessary to check the condition of the plates by looking at printed proofs of each plate, but conventional printing machines with multi-sided plate cylinders have the disadvantage that such confirmation of the condition of the plates is not possible.

The present invention has been made in order to eliminate such drawbacks of the conventional art, and its purpose is to provide a multi-sided printing cylinder that can easily detect printed matter printed by a specified plate of the multi-sided printing cylinder. An object of the present invention is to provide a plate designation control device for a printing press.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a block diagram of a printing press having a multifaceted plate cylinder and equipped with an embodiment of a plate designation control device according to the present invention. The paper fed from the paper feed pile 1 to the registration section by the feeder 2 is moved to 1 by the swing device 3.
The sheets are delivered to the impression cylinder 4 one by one. The quadruple cylinder plate cylinder 5 has the same plate on four sides, and four inked rollers 6a, 6b, 6c, and 6d of different colors are arranged on the outer peripheral surface, and each plate is coated with four colors of ink. . When the impression cylinder 4 rotates once, the ink of one side of the plate is printed on the paper, and when the impression cylinder 4 rotates four times, the plate cylinder 5 rotates once and prints the ink on one side of the plate on the paper.
The side plates are printed one after the other. The printed paper printed on the impression cylinder 4 is delivered to a paper take-up cylinder 7, and sent to a delivery 9 by a chain 8, where it is discharged onto a paper discharge pile 10.

FIG. 2 is a front view of the printing plate detection device. A detection body 12 having protrusions 12a, 12b, 12c, and 12d corresponding to each plate of the plate cylinder 5 is fixed to the rotation shaft 11 of the 4-fold plate cylinder 5, and the rotation trajectory of each protrusion is A plate surface detection sensor 13 consisting of a proximity switch is arranged near the plate. When the rotating shaft 11 rotates, the protrusions 12a, 12b, 12c, 12
d sequentially pass near the printing plate detection sensor 13, and at the timing of this passing, printing plate signals corresponding to each printing plate are outputted from the printing plate detection sensor 13 and taken out by the lead wire 14. Further, a detection body 15 having one protrusion 15a is fixed to the rotating shaft 11, and a reference sensor 16 consisting of a proximity switch is arranged near the rotational trajectory of the protrusion 15a.
When the rotary shaft 11 rotates, the protrusion 15a passes close to the reference sensor 16 once every rotation, and at this passing timing, a reference signal is output from the reference sensor 16 and taken out by the lead wire 17.

The timing of the reference signal and the plate surface detection signal is such that after the reference signal for rotating the rotating shaft 11 in the direction of the arrow is output, the protrusions 12a, 12b, 12
The plate surface signals of the plates corresponding to the plates c and 12d are sequentially output.

FIG. 3 is a block diagram of the control circuit. When the switch for sample command is operated, the command circuit 2
A command signal is output from 0, and when this command signal is input to the C terminal of the JK flip-flop 21, the output of the Q terminal becomes "H". Thereby,
AND gates 22 and 23 are each turned on. When the plate cylinder 5 rotates and a reference signal is output from the reference sensor 16, this reference signal is output from the AND gate 22 and input to the C terminal of the JK flip-flop 24. As a result, the Q terminal of JK flip-flop 24 goes “H”.
, and the AND gate 25 becomes gate-on.

On the other hand, as shown in FIG.
After the reference signal is output from the plate surface detection sensor 1
The printing plate signals are sequentially output from 3 onwards. When the reference signal is output, the R terminal of the counter 26 becomes "H" and is reset to a state in which it is ready to start counting.
The printing plate signal is outputted from the AND gate 23 and inputted to the C terminal of the counter 26 to start counting.
Projections 12a, 12b, 12c, 12d in FIG.
The printing plate signals generated by the counter 26 are counted, and the terminals Q ₁ , Q ₂ , Q ₃ , and Q ₄ of the counter 26 sequentially become "H". The setting switch 27 has four fixed contacts S ₁ , S ₂ , S ₃ , S ₄ and one movable contact K. Each fixed contact is connected to the Q terminal of the counter 26, and the movable contact K is an AND gate. 25 input terminals. Note that this counter 26 and setting switch 27 constitute a setting counter device. Therefore, if the setting switch 27 is now set so that the movable contact K contacts the fixed contact _S3 , the third plate signal is input and the counter 26
When the Q ₃ terminal of the JK flip-flop becomes "H", a designated signal is output, and this designated signal is output from the AND gate 25 and input to the C terminal of the JK flip-flop 28. As a result, the Q terminal of the JK flip-flop 28 becomes "H", a designated output is output from the output circuit 29, and the printing paper printed by the designated plate is detected. This specified output is generated when the plate of the plate cylinder 5 corresponding to the protrusion 12c is printed, so this output is shifted and held until the printing paper printed with the plate is conveyed to the delivery 9. When this printed paper reaches the delivery 9, it is delivered to a separate pile (not shown) as a sample. Although the shift circuit is not shown in FIG. 3, known circuits (shift register, flip-flop, etc.) are used. Also, known means are used to switch piles by delivery.

On the other hand, when the third printing plate signal is output from the AND gate 23, this output is inverted by the inverter 30 and becomes "L" and enters the AND gate 31. Therefore, the output of the AND gate 25 is “H”
Even if one input of the AND gate 31 becomes "L", the output of this AND gate 31 becomes "L".
However, when the third plate signal output from the AND gate 23 eventually becomes "L", both inputs of the AND gate 31 become "H" and its output becomes "H". Due to this "H" output, the R terminals of all JK flip-flops 21, 24, and 28 become "H" and are reset. By this,
The operation of detecting the printing paper of the specified desired version is completed.

In this way, by operating the setting switch 27, it is possible to easily detect the printed paper printed by the specified desired plate.

In addition to ejecting the printed paper to be sampled into a separate pile, it is also possible to insert the paper onto a tape during delivery for sampling. Furthermore, various types of setting counter devices can be applied in addition to the embodiments.

As described above, according to the plate designation control device according to the present invention, it is possible to detect the printing paper printed with the designated plate among the plates of the multi-sided plate cylinder with a simple configuration, and the state of the plate can be checked quickly. This can significantly reduce losses. Furthermore, the simple configuration has many advantages, such as fewer malfunctions and failures.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a printing press having a multi-sided plate cylinder equipped with an embodiment of the plate designation control device according to the present invention, Fig. 2 is a front view of the plate detection device, and Fig. 3 is a block diagram of the control circuit. It is. 2... feeder, 3... swing device, 4...
Impression cylinder, 5... plate cylinder, 6a to 6d... inked roller, 9... delivery, 12, 15... detection object, 1
2a to 12d, 15a... protrusion, 13... plate detection sensor, 16... reference sensor, 20... command circuit, 21, 24, 28... JK flip-flop, 22, 23, 25, 31... AND gate, 26...Counter, 27...Setting switch,
29...Output circuit.

Claims (1)

[Claims] 1. A reference sensor that operates while being rotatably connected to a plate cylinder having a plurality of plates and outputs one reference signal per rotation of the plate cylinder; and a setting counter device that is reset by the reference signal, counts the plate signals, and outputs a designated signal when an arbitrarily set set value is counted. A plate designation control device for a printing press having a multifaceted plate cylinder, wherein a predetermined one of the plurality of plates can be designated by the setting.