JPS61148060A - Non-feeding detecting apparatus in printer - Google Patents

Abstract

PURPOSE:To make possible non feeding condition in a printer to be detected automatically by detecting that a blank is not fed from a feeding section to a printing drum with a regular timing during a printing electrically. CONSTITUTION:The pulses of '36' times are generated in one rotation of a printing drum by a timing pulse generator 1, on the other hand, '37' is memorized as the pulse number in a setting memory section 6. A counter 4 counts till '35' and becomes to '0' being set by a feeding paper detecting signal from a feeding paper detecter 2. The counter 4 is not reset and counts till '37', since the feeding detecting signal is not sent from the feeding paper detector 2 even though the counting till '35' is completed when a non feeding condition is generated. In this time, a coincidence signal is outputted by a comparator 5, since an output is coincided to a setting value of the setting memory section 6, and non feeding memory signal is generated and outputted to an alarm device 8 and alarmed by a non feeding memory circuit 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a non-feed detection device in a printing press, and more specifically, to a non-feed detection device for a printing press. The present invention relates to a non-feed detection device in a printing press that detects and outputs a non-feed.

(Prior art) In a printing machine, when printing paper does not feed, it is thought that some kind of trouble has occurred in the paper feed section, so it is necessary to take immediate action after detecting the non-feeding. .

The following measures can be considered for this.

■Stop coining operation.

■Stop the transfer operation.

■Stop paper feeding operation.

■Stop ink supply operation.

In reality, it is possible to consider a combination of several of these measures after detection of non-feed.

On the other hand, in conventional printing presses, processing after non-feed printing and non-feed detection were performed as follows.

FIGS. 2 and 3 are diagrams for explaining a non-feed detection device in a conventional printing press. Note that FIG. 2 is a view seen from the operating side, and FIG. 3 is a view seen from the opposite side to FIG. 2.

As shown in FIG. 2, the printing process includes an ink font roller, a function that rotates the printing press.

A vibrating roller, a foam roller, etc. are used to balance the ink supplied via the ink duct roller, filtration roller, and rider roller, and the dampening liquid supplied via the water fontaine roller and water duct roller.
Function to ink the ink on the plate wrapped around the plate cylinder 9 Function to transfer the ink on the image of the plate wrapped around the plate cylinder to the blanket cylinder.

It requires functions such as feeding paper and coining the image on the blanket cylinder onto the paper using an impression cylinder.

As shown in FIG. 3, in the conventional printing machine, the paper 10 is
Paper feeding has been detected by pushing a paper feeding lever 13 provided between a first paper feeding roller 11 and a second paper feeding roller 12. By the movement of this lever 13, transfer and coining are mechanically performed for each fed sheet. In addition,
14 is an upper guide, 15 is a lower guide, and 16 is a spring.

In such a printing machine, when a non-feed occurs, paper feeding is not detected, so only the transfer and coining operations are stopped for one rotation. Therefore, when the next sheet feeding is performed normally, the transfer and coining operations are restarted. These transfer and coining operations are not performed immediately upon paper feed detection;
It starts at a timing determined by the operation of the cam. Further, when a non-feed occurs or when paper feeding ends, the transfer and coining operations are canceled at a timing determined by the operation of the cam.

When normal paper feeding continues, transfer and coining operations are also performed continuously.

(Problems to be Solved by the Invention) As described above, in conventional printing presses, the paper feeding detection mechanism was basically used for detecting non-feeding without the purpose of detecting non-feeding. That is, basically, the purpose is not to detect non-feeding, but to detect paper feeding, and it can also be applied to detect non-feeding as a function opposite to paper feeding detection.

Therefore, it is not suitable for original paper feeding detection.

In addition to the above-mentioned measures, there are other methods to take after detecting non-feeding, such as stopping paper feeding and stopping ink supply, so for this purpose it is more advantageous to detect non-feeding electrically. However, in conventional printing presses, detection is performed purely mechanically, so electrical signals are not passed through to obtain them. In order to obtain electrical signals from such a printing machine, in addition to the conventional mechanism, means for detecting whether inking operation is in progress or paper feeding operation is in progress is provided, and the movement of the paper feed detection lever and detection means are added. A means to detect timing is required. As the automation of printing presses progresses, the need to electrically detect the status of the printing press increases, so electrical detection is more advantageous from this point of view as well.

Furthermore, in conventional printing presses, there was no appropriate means to alert when a non-feed occurred.

An object of the present invention is to electrically detect and output that paper is not being fed from the paper feed section to the printing cylinder at the regular timing during printing, and to detect non-feeding in a printing press that solves all of the above-mentioned problems. The goal is to provide equipment.

(Means for Solving the Problems) In order to achieve the above object, a non-feed detection device for a printing press according to the present invention includes a timing pulse generator that generates a timing pulse synchronized with the rotation of a printing cylinder during printing;
a paper feed detector that detects the supply of paper from the paper feed section to the printing cylinder and outputs a paper feed detection signal; and a paper feed detector that counts the timing pulses and outputs a count signal that is reset by the paper feed detection signal. a setting storage unit that outputs a set value of the rotation angle of the printing cylinder that determines that the paper feeding unit is in a state where the paper is not fed; a comparator that outputs a detection signal;
A non-feeding storage circuit generates and outputs a non-feeding storage signal from the non-feeding detection signal, and the memory thereof is erased by the paper feeding detection signal.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings and the like.

FIG. 1 is a block diagram showing an embodiment of a non-feed detection device in a printing press according to the present invention.

The timing pulse generator 1 is for generating timing pulses corresponding to the rotation of the printing cylinder, and uses a photosensor to generate timing pulses synchronized with a slit in a rotating disk provided on the printing cylinder. The timing pulse generated by the timing pulse generator 1 is sent to the counter 4.
is connected to the clock terminal CL of.

The paper feed detector 2 is for detecting that paper is being fed and outputting a paper feed detection signal. This is L
A photoelectric sensor using an ED and a phototransistor is used. The paper feed detector 2 is provided on the paper supply path from the paper feed section to the printing cylinder.

The output of the paper feed detector 2 is connected to a reset terminal R of a counter 4 via a one-shot multi-pipe rake (hereinafter referred to as 03M) 3.

The counter 4 counts and outputs the timing pulses generated by the timing pulse generator 1 as a printing cylinder rotation signal. The counter 4 is reset by a paper feed detection signal from the paper feed detector 2. In other words, the counter 4 counts the angle at which the printing cylinder rotates while the paper is not being fed.

The outputs of the counter 4 and the setting storage section 6 are connected to the comparator 5 . The comparator 5 compares the output of the counter 4 and the output of the setting storage section 6-, and outputs a match signal when they match. This coincidence signal becomes a non-feed detection signal. The output of the comparator 5 is connected to a non-send storage circuit 7.

The setting storage unit 6 stores a reference value of the number of revolutions of the printing cylinder at which it is determined that the paper feed unit has not fed the paper.

The non-send storage circuit 7 is a circuit that generates and outputs a non-send storage signal based on the match signal from the comparator 5. The non-feeding memory circuit 7 receives a paper feed detection signal from the paper feed detector 2.
The non-sending memory signal is erased.

The alarm device 6 is for generating an alarm indicating non-feeding when the non-feeding storage circuit 7 outputs an output. for example,
The alarm may be visually displayed using an LED or the like, or an audible warning may be provided using a buzzer or the like. Of course, these means can also be used together.

Next, the operation of the non-feed detection device according to the present invention will be explained using a specific example.

The timing pulse generator 1 generates 36 pulses per revolution of the printing cylinder.
'' pulses are generated. On the other hand, the setting storage section 6 stores ``37'' as the number of pulses.

If paper is being fed normally, the counter 4 counts up to "35" and is reset to "0" by the paper feed detection signal from the paper feed detector 2.

When non-feeding occurs, even if the counter 4 counts up to "35", it is not reset because there is no paper feed detection signal from the paper feed detector 2, and ends up counting up to "37". At this time, since the output of the counter 4 matches the set value of the setting storage section 6, the comparator 5 outputs a match signal.

Based on the match signal from the comparator 5, the non-send storage circuit 7
Generates a non-send memory signal and outputs it to the alarm 8,
will issue a warning to that effect.

If the non-feeding occurs only once and the second sheet is fed normally, the paper feed detector 2 detects the paper feeding and the non-feeding memory circuit 7
Erases the non-send memory signal.

(Modification) In this embodiment, there is no special regulation on the timing of the timing sensor, and if a timing sensor for another purpose is used, it can be used in common. In particular, such timing sensors are always used in automated printing presses that use microcomputers, so the counters and comparators used in this device can be replaced with additional components by using the same functions in the CPU. The invention can be practiced without.

In addition, we have described an example in which an alarm is installed, but as mentioned above, there are several ways to deal with the detection of non-feed, so
If a mechanism is provided to stop ink supply, paper feed, etc. by operating a solenoid, it is easy to use the present invention to operate those solenoids and perform the respective measures instead of an alarm. be.

Further, as an application example of the present invention, the non-feed detection signal which is the output of the comparator 5 is counted by a newly provided counter, and this counter is reset by the paper feed detection signal from the paper feed detector 2. Therefore, it is also possible to use the counter to count the number of continuous downward feed detections, and to stop the paper feeding operation when the number exceeds a certain value.

Furthermore, according to the present invention, when a non-feed occurs, a buzzer issues a W alarm, and then, if the next paper feeding is performed normally, the buzzer is stopped and printing continues, and only when non-feed continues, the paper is fed. You can also stop the paper movement.

In addition to this, according to the present invention, it is easily possible to combine several measures after detection of non-feeding.

(Effects of the Invention) As described in detail above, according to the present invention, it is possible to detect when paper is not being fed from the paper feed section to the printing cylinder at the regular timing during printing, and It is possible to detect that the item has not been sent.

In addition, in a device that detects non-feeding based on the timing of a single point on the printing cylinder, if the timing detector is synchronized with the plate cylinder or blanket cylinder, this timing must be changed when the vertical adjustment is made. However, in the apparatus according to the present invention, there is no need to change the timing if the rotation angle of the printing cylinder is set in advance by taking into account the vertical adjustment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a non-feed detection device in a printing press according to the present invention. FIGS. 2 and 3 are diagrams for explaining a non-feed detection device in a conventional printing press. l...Timing pulse generator 2...Paper feed detector 3...03M4...Counter 5...Comparator 6...Setting storage unit
7...Non-feeding memory circuit 8...Alarm device

Claims (1)

[Claims] a timing pulse generator that generates a timing pulse synchronized with the rotation of the print cylinder during printing; a paper feed detector that detects the supply of paper from the paper feed section to the print cylinder and outputs a paper feed detection signal; Counts the timing pulses and outputs a count signal, outputs a counter that is reset by the paper feed detection signal, and a setting value for the rotation angle of the printing cylinder that determines that the paper feed unit is not feeding the paper. a settings storage section to
a comparator that outputs a non-feeding detection signal when the count signal becomes equal to the set value; and a comparator that generates and outputs a non-feeding memory signal from the non-feeding detection signal, and the memory thereof is stored by the paper feeding detection signal. A non-feed detection device in a printing press comprising a non-feed memory circuit that is erased.