JPH0348030B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a paper discharge control device for a printing press that can accurately count the number of main sheets and change piles even if proof sheets are included. .

[Conventional technology]

Normally, in securities printing, etc., so-called special paper is used, which is made of a special material or specially processed with a mark to prevent counterfeiting. Since such paper is more expensive than plain paper, it is necessary to avoid waste paper as much as possible.

Generally, a printing press performs proof printing on plain paper before starting printing and performing registration and color matching. In addition, when printing starts or when printing is restarted after it has stopped due to an accident, the ink flow is different from normal, resulting in darker prints.
20 proofs are required. Therefore, when printing on special paper, make a proof on plain paper and
Once printing becomes normal, it is necessary to print on special paper.

[Problem to be solved by the invention]

For this reason, plain paper and real paper are mixed up during delivery, and it is extremely troublesome to sort them after printing.

Devices that automatically count printed sheets are being considered, but conventional devices count all the printed sheets, leading to errors in the number of sheets required and making it difficult to count accurately. The drawback is that it cannot be done.

The present invention was made in order to eliminate these conventional drawbacks, and its purpose is to enable accurate counting and journalization of only the number of printed sheets even if proof sheets are mixed in. An object of the present invention is to provide a paper discharge control device for a printing press.

[Means to solve the problem]

In order to achieve such an objective, the present invention
A main paper detector 4 that does not detect proof paper but detects main paper and sends out a main paper signal, a timing generator 17 that sends out one pulse as a timing signal every time one sheet is printed, and a main paper signal and timing. A holding circuit 21 operates by AND outputting the holding signal and transmitting the holding signal, and a holding circuit 21 operates by ANDing the holding signal and the timing signal to count the number of input timing signals and generate a shift signal when a predetermined value is reached. A shift circuit 23 that sends out the paper, and a paper presence/absence detection device that is installed in front of the delivery device that discharges and collects the printed and transported paper, detects the presence or absence of passing paper, and sends out a paper presence signal when paper is present. vessel 12
, a counter 25 that operates by AND outputting a shift signal, a timing signal, and a paper presence signal, counts the number of input timing signals, and sends out an output signal when a predetermined value is reached, a holding circuit, and a shift circuit. A reset circuit 27 for resetting is provided.

[Effect]

With this configuration, the output signals of the counter are used to sort out the discharged sheets within the delivery system.
Even if proof paper is mixed in, the number of printed main papers can be counted accurately.

〔Example〕

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

FIG. 1 is a block diagram of a printing press equipped with an embodiment of a paper discharge control device according to the present invention. In the figure, papers in a paper feed pile 1 are sequentially fed to a front part 3 by a feeder 2, and here a main paper detector 4 placed at a predetermined position in the front part 3 detects whether the paper is proof paper or main paper. Detected. This main paper detector 4 is composed of a photoelectric converter with a function to detect each color, and does not output a signal when there is no paper or when colored proof paper passes, but when a white main paper passes through, it does not output a signal. The paper signal is sent out when the paper is detected. When the printing press starts operating, paper is continuously supplied to the position where the main paper detector 4 is installed, so that once the main paper starts being supplied, the main paper signal is continuously output.

The paper that has been fed to the front part 3 and whose position has been determined is delivered to the impression cylinder 6 by the swing 5, and during one printing rotation, it is pushed by the ink roller 7 onto the plate cylinder 8 coated with ink. Printing is done. The printed paper is transferred from the impression cylinder 6 to the chain 10 via the transfer cylinder 9. And the handed over paper is Chain 10
It is carried to the delivery 11 by being held in a claw rod provided in the. Immediately before delivery 11, light emitter 1
Paper presence/absence detector 12 consisting of a light receiver 2a and a light receiver 12b
is arranged, and when the paper is conveyed by the chain 10 and passes between the light emitter 12a and the light receiver 12b, the light is cut off and a paper presence signal is sent from the paper presence/absence detector 12. The paper conveyed to the delivery 11 is discharged to the first paper discharge pile 13a or the second paper discharge pile 13b by a paper discharge means (not shown).

FIG. 2 is an explanatory diagram of the timing generator. In the figure, reference numeral 15 denotes a rotating shaft of the impression cylinder 6, and a proximal body 16 having a protrusion 16a is fixed to this rotating shaft 15. A timing generator 17 consisting of a proximity switch is arranged near the rotation orbit of the protrusion 16a, and a timing signal is generated by the proximity of the protrusion 16a every time the rotating shaft 15 makes one rotation (one printing rotation). It is sent out via the lead wire 18.

FIG. 3 is a circuit diagram of the control circuit. In the figure, when the main paper signal is sent from the main paper detector 4, its output becomes "H" level, and when the timing signal is sent from the timing generator 17, the output becomes "H", and the output of the AND gate 20 becomes "H" level. The output becomes "H". As a result, the JK flip-flop 21 as a holding circuit has a clock terminal C at "H".
The circuit operates as follows, a holding signal is sent from the output terminal Q, the output becomes "H", and this state is maintained. At this time, since both inputs of the AND gate 22 also become "H", its output becomes "H" and is input to the data terminal D of the shifter 23. shifter 2
3, the clock terminal C becomes "H" at the same time due to the timing signal, so one pulse is counted. When printing is performed and timing signals are sequentially sent from the timing generator 17, the shifter 23
The input pulses are counted, and when the count reaches 6, a shift signal is sent from the output terminal _Q6 and its output becomes "H". In this embodiment, the number of count-up pulses of the shifter 23 is set to 6 so that the printed paper reaches delivery within 6 printing rotations from detection of the main paper.

Therefore, when the printing press starts operating and proof paper is first fed and printed, the main paper signal is not sent out, so no matter how many timing signals are sent out, the JK flip-flop 21 and shifter 23 are The shifter 23 does not operate, and even if the printing of the main paper starts, the shifter 23
The output of output terminal _Q6 is "L". Then, when the main paper that was first detected and printed by the main paper detector 4 is conveyed for 6 printing rotations, that is, when this main paper comes just before delivery, the output of the output terminal Q ₆ of the shifter 23 becomes "H". At the same time, the passage of this main paper causes a paper present signal to be sent out, and its output becomes "H". Therefore, at the timing of sending out the timing signal, the 3 inputs of the AND gate 24 become "H", and its output becomes "H". "become. This "H"
At the output, preset counter 25 counts one pulse. The paper presence signal has a pulse width that corresponds to the length of the paper, and the timing signal is generated within the time of this pulse width. The counter 25 is counted. The main paper that has been delivered is discharged to the first pile. This preset counter 25 is preset to, for example, 500, and when it counts 500 sheets of paper, it sends out a count-up output signal and at the same time automatically returns to zero. This output signal causes the output circuit 26 to operate and send a drive signal to a paper ejecting means (not shown), thereby performing a switching operation so that the paper is subsequently ejected to the second pile. Thus, the first pile contains the main paper.
500 sheets are ejected accurately. While the paper is being delivered to the second pile, the paper in the first pile is being delivered and the paper is being delivered to the second pile.
After 500 sheets have been ejected into the pile, the paper ejects again to the first pile.
The pile can be switched to . Proofing paper is mixed into the pile from which the first paper is ejected and the pile from which the paper started in the middle is ejected, but this proofing paper is not counted, so each pile must contain e.g.
500 sheets of main paper will be output.

Further, 27 is a reset circuit, and when a reset signal is sent out, this signal is sent to the reset terminal R of the JK flip-flop 21 via an OR gate 28.
and directly input to the reset terminal R of the shifter 23 to reset each circuit. This reset circuit 27 operates when the printing press starts operating to perform an initial reset, so that both circuits start operating from a clear state.

Also, if there is a gap in the main paper supply, or if the printing machine is interrupted midway and proof paper is inserted, the main paper signal disappears during that time and becomes "L", so this "L" signal is passed through the inverter 29. " becomes "H", and this "H" enters the reset terminal R via the OR gate 28, and the JK flip-flop 21 is reset. As a result, the data terminal D of the shifter 23 becomes "L", so that it is counted down every time the timing signal is input, and the output terminal _Q6 becomes "L". Then, the main paper is supplied again and the normal operation is resumed. When the data terminal D becomes "H", counting starts and the output terminal _Q6 becomes "H". Therefore, the output of the AND gate 24 is "L" while the output terminal _Q6 is "L", and the preset counter 25 does not count the number of pages during this period. In this way, even if an accident like the one described above occurs during the process, the preset counter 25 accurately counts only the number of main sheets.

Here, since the claw rod of the chain passes between the paper presence/absence detectors 12, if it passes without holding paper in its mouth, an erroneous signal with a short pulse width will be sent from the paper presence/absence detector 12. However, the timing at which this erroneous signal is generated, that is, the position of the claw rod, is shifted from each other so that it does not coincide with the timing at which the timing signal is generated, that is, the relative position of the protrusion 16a and the timing generator 17 in FIG. It is set. Therefore, the timing signal and the error signal do not occur at the same time, but are out of phase with _each other by a predetermined interval. The output of the AND gate 24 is "L" even if the signal passes through the gate, so there is no need to worry about erroneous counting. Note that even when the actual paper used is the shortest, the timing signal is generated within the pulse width of the paper presence signal generated by the passage of this paper. Therefore, even if the paper is the shortest, the above-mentioned error signal does not occur, and normal counting is performed.

In the above embodiments, the piles of the printed sheets were changed and the sheets were sorted by a predetermined number of sheets, but it is also possible to use a color tape feeder to insert a tape between the sheets of paper to mark the sorting. . Further, in order to prevent printed proof sheets from being mixed in with main sheets, an additional device may be used to eject sheets into a separate pile when the preset counter is not counting. In addition, application examples include not only printing on special paper such as securities printing, but also printing on additional printing and back side printing, where the number of sheets that have already been printed is fixed, and proof printing is required. It can also be applied when this paper cannot be used.

〔Effect of the invention〕

As described above, according to the present invention, there is no need to count the number of sheets of main paper after printing, and there is no need to separate the main paper and proof paper, thereby eliminating wasted time and improving productivity. In addition, it has many excellent effects, such as saving expensive main paper and being able to accurately know the number of main papers during printing, so that the number of spare print sheets can be kept to the minimum necessary.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a printing press equipped with an embodiment of the paper discharge control device of the present invention, FIG. 2 is an explanatory diagram of a timing generator, and FIG. 3 is a circuit diagram of a control circuit. 2... Feeder, 3... Front part, 4... Paper detector, 5... Swing, 6... Impression cylinder, 8... Plate cylinder, 10... Chain, 11... Delivery, 12
... Paper presence/absence detector, 13a, 13b ... Paper output pile, 17 ... Timing generator, 21 ... JK flip-flop, 23 ... Shifter, 25 ... Preset counter, 26 ... Output circuit, 27 ……
reset circuit.

Claims (1)

[Claims] 1. A main paper detector that does not detect proof paper but detects main paper and sends out a main paper signal, and a timing generator that sends out one pulse as a timing signal every time one sheet is printed. A holding circuit operates by AND outputting the paper signal and the timing signal and sends out the holding signal, and a holding circuit operates by ANDing the holding signal and the timing signal and counts the number of input timing signals and outputs the holding signal. A shift circuit that sends out a shift signal when the value is reached, and a shift circuit that is installed in front of the delivery system that ejects and collects printed and transported paper, detects the presence or absence of paper that is being transported and passes, and detects the presence of paper. It operates with a paper presence/absence detector that sends out a paper presence signal when a paper presence signal is output, and an AND output of a shift signal, a timing signal, and a paper presence signal, and when the number of input timing signals is counted and a predetermined value is reached, an output signal is output. A paper discharge control device for a printing press, comprising: a counter that sends out paper; and a reset circuit that resets a holding circuit and a shift circuit, and which sorts paper discharge within a delivery using an output signal from the counter.