JP3352145B2 - Printer out-of-paper detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a paper break in a printing press, and can be used for detecting a paper break in a rotary printing press that handles a continuous web such as an offset rotary printing press or a gravure rotary printing press.

[0002]

BACKGROUND ART In general, a roll-up web (continuous paper)
In a web-fed rotary printing press, the web may break due to tension fluctuation or other trouble during printing. If such a paper break occurs, the cut web may be loosened and wrapped around the rotating portions of the printing cylinder, the ink roller, and the like multiple times, which may cause serious damage to the printing cylinder, the ink roller, and the like. For this reason, conventionally, in order to prevent such a cut-off web from being entangled, a process is provided in which the printing press is provided with a paper cut-out detecting device to detect a web cut-off, and when the paper cut-out is detected, a process of stopping the printing press is performed. It was done.

FIG. 4 shows a conventional paper-out detecting device 90 provided in an offset rotary press 81. The offset rotary printing press 81 includes a printing unit 82 on the left side in the figure and a dryer (dryer) 83 on the right side in the figure located downstream of the printing unit 82. A web 84 is continuously passed through the printing unit 82 and the dryer 83. The printing unit 82 has upper and lower plate cylinders 85 and blanket cylinders 86, and the web 84 sent from the upstream.
This is a device that performs printing. The drier 83 is a device that dries the ink printed on the web 84 by the printing unit 82 and fixes it on the web 84, and is a large device in which the length W of the web 84 in the traveling direction is about several meters.

[0004] Between the printing unit 82 and the dryer 83, a paper breakage detecting device 90 for detecting a paper breakage of the web 84 is provided. The paper-out detecting device 90 includes a sensor 91 provided above or below the passing position of the web 84 and configured to detect the presence or absence of the web 84, and a paper-out determining unit 92 that determines whether the paper has run out based on a signal from the sensor 91. Have. As the sensor 91, a transmission-type or reflection-type optical sensor or an air-type sensor is used.

FIG. 5 shows a state in which a paper break has occurred in the offset rotary printing press 81. As shown in FIG. 5, the web 84 cut at the point P in the drawing in the drier 83 loses the tension and is still sent from the upstream side of the printing unit 82 in the direction A in the drawing even after the paper breaks. It is loosened between the printing unit 82 and the dryer 83, for example, it is caught between the plate cylinder 85 and the blanket cylinder 86. Then, the edge 87 of the cut web 84 is pulled back in the direction B in the figure by the web 84 being caught between the plate cylinder 85 and the blanket cylinder 86, and is located immediately below the sensor 91 (point K in the figure). Pass through. At this time, the signal of the sensor 91 changes when the edge 87 of the web 84 passes, that is, changes when the web 84 disappears from the position immediately below, and the change of paper is determined by the paper break determination means 92 to determine whether the paper has run out. Thereafter, in response to a signal from the paper-out determining means 92, abnormal processing such as cutting of the web 84 and stopping of the web offset printing press 81 for preventing entanglement due to paper cut (not shown) is performed.

[0006]

However, in the conventional paper breakage detecting device 90 using a sensor 91 such as an optical sensor as shown in FIG. 4, a web 84 such as a dryer 83 is used as shown in FIG.
If the web 84 breaks in a device that is long in the direction of travel, the edge 87 of the web 84 passes through a position immediately below the sensor 91, and it takes a considerably long time for the sensor 91 to detect this. And
During this time, there has been a problem that the winding of the web 84 progresses. In order to shorten the time required for sensing, it is conceivable to provide a sensor 91 in the dryer 83.
Since the gap between the dryer 84 and the dryer 83 is narrow, there is a problem that it is difficult to install the detector 91 in the dryer 83.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for detecting an out-of-paper condition of a printing press, which is capable of detecting a break in a continuous sheet in a short time and reducing the amount of continuous paper entangled in the printing press. .

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to achieve the above object by detecting that the position of a continuous sheet has deviated from a predetermined allowable range and determining that the continuous sheet has run out of paper. . Specifically, the paper-break detecting device of the printing press according to the present invention includes a deviation detecting unit that detects whether the position of the continuous paper being printed in the direction crossing the paper surface deviates from a predetermined allowable range, and a deviation detecting unit that detects the deviation. by a signal from the means it possesses a determining piece of paper determining means for pieces of paper of the continuous paper, before
The deviation detecting means is provided for detecting a deviation from a predetermined position to the continuous paper.
Distance detecting means for detecting the distance in the direction intersecting the paper surface;
The distance detected by the separation detecting means deviates from the allowable range.
You characterized and this <br/> that a deviation identifying means for identifying whether it is. Moreover, out of paper detection apparatus for a printing press of the present invention, prior Symbol deviation detecting means has a range setting means for setting the allowable range, the range setting means, said distance detection in running stability when the continuous paper Reference distance setting means for setting a distance between the means and the continuous paper; upper limit relative distance setting means for setting a relative distance from a position of the continuous paper at a stable running time to an upper limit position of the allowable range; Lower limit relative distance setting means for setting a relative distance from a position at the time of stable running of the paper to a lower limit position of the allowable range; and a reference distance setting means, an upper limit relative distance setting means, and a lower limit relative distance setting means. Calculating means for calculating an upper limit value and a lower limit value of the allowable range based on each distance. In the paper-out detecting device for a printing press according to the present invention, the reference distance setting means inputs and monitors a printing speed signal of the main body of the printing press, and detects the distance when the printing speed reaches a predetermined value. The distance detected by the detecting means is set as the reference distance.

[0009]

In the present invention, utilizing the fact that the continuous paper is slackened when the continuous paper breaks, the deviation detecting means determines whether or not the position of the continuous paper during printing is out of a predetermined allowable range. And when it is determined from the signal from the deviation detecting means that the position of the continuous paper has deviated from the predetermined allowable range, the paper-out determining means determines that the continuous paper has run out, and then performs abnormal processing. To stop the printing press.

The deviation detecting means includes a distance detecting means for detecting a distance from a predetermined position to a continuous sheet in a direction crossing the paper surface, and a distance detected by the distance detecting means deviating from a predetermined allowable range. since whether it is and a deviation identifying means for identifying a constant allowable range is the distance
Mari, setting the allowable range is done by a numerical designation of distance. For this reason, it is possible to arbitrarily set the allowable range only by changing the numerical value, and the setting operation and the change operation itself become easy.

Further, by setting the upper limit value and the lower limit value of the predetermined allowable range based on the relative distance from the position of the continuous paper when the running is stable, more accurate detection becomes possible. In setting the position (reference distance) of the continuous paper at the time of running stability, the printing speed signal of the printing press sent from the printing press main body is input and monitored, and the printing speed reaches a predetermined value. If the distance detected by the distance detecting means at the time is set as the reference distance, the reference distance can be automatically set, and no manpower is required.

By installing these paper-out detecting devices in a printing press, when the edge of a conventional continuous paper passes immediately below the installation location of the sensor 91 (FIG. 4), that is, Compared to detecting that a paper break has occurred when the paper has disappeared from directly below the installation location of the sensor 91, it is possible to detect the occurrence of a paper break while the continuous paper is still directly below the paper break detector, The time from the occurrence of an actual paper break to the time of performing an abnormal process such as stopping the printing press is greatly reduced, and the amount of wrapping around the rotating portion of the printing press is reduced, thereby achieving the above object.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an offset rotary printing press 11 including a paper-out detecting device 50 according to the present embodiment. The offset rotary printing press 11 has substantially the same configuration as the offset rotary printing press 81 of FIG. 4 described above, and includes a printing unit 12 having a plate cylinder 15 and a blanket cylinder 16 and a dryer 13, and these devices include webs. 14 are passed.

Between the printing unit 12 and the dryer 13, there is provided a paper-out detecting device 50 having a different configuration from the paper-out detecting device 90 of FIG. Paper out detector 50
Is a device for detecting the paper breakage of the web 14 by utilizing the slackness of the web 14 when the paper breaks out of the web 14 and capturing that the position of the web 14 deviates from a predetermined allowable range H that is a normal printing state. A distance sensor 20 installed at a predetermined interval above or below (here, below) the passing position of the web 14 and serving as distance detecting means for detecting the distance to the web 14; Range setting means 30 for setting
A deviation identifying means 40 for identifying whether or not the distance detected by the distance sensor 20 deviates from the allowable range H; and a paper-break determining means 52 for performing a paper-break determination of the web 14 based on the identification result by the deviation identifying means 40. And Also,
Among these means, the distance sensor 20 and the range setting means 30
Departure detecting means for detecting whether or not the position of the web 14 deviates from a predetermined allowable range H
51 are configured.

The range setting means 30 determines the distance between the web 14 and the distance sensor 20 when the running of the web 14 is stable (reference distance).
LR), and upper limit relative distance setting means 32 for setting a relative distance (upper limit relative distance LH> 0) from the position of the web 14 at the time of stable running to the upper limit position of the allowable range H. , The allowable range H from the position of the web 14 when the running is stable
And a lower limit relative distance setting means 33 for setting a relative distance to the lower limit position (lower relative distance LL <0). Further, the range setting means 30 includes these reference distance setting means 31,
The reference distance storage unit 34, the upper limit relative distance storage unit 35, and the lower limit relative distance storage unit 36 that store the set values by the upper limit relative distance setting unit 32 and the lower limit relative distance setting unit 33, respectively, are stored in these respective storage units. Reference distance LR, upper limit relative distance
A calculating means 37 for calculating and calculating the upper limit value and the lower limit value of the allowable range H based on LH and the lower limit relative distance LL.

The reference distance setting means 31 constantly inputs (scans) the printing speed signal of the offset rotary printing press 11 via an input interface (not shown), and always inputs (scans) the distance signal sent from the distance sensor 20. When the printing speed reaches a predetermined value at which the running of the web 14 is stabilized, the distance sensor at this printing speed is used.
The reference distance storage unit 34 uses the detection distance by 20 as the reference distance LR.
Is configured to be written to. Further, the reference distance setting means 31 does not always scan the distance signal from the distance sensor 20, and when the printing speed reaches a predetermined value at which the running of the web 14 is stabilized, the distance signal from the distance sensor 20 is not used until the printing speed reaches a predetermined value. May be scanned, and this scan value may be written to the reference distance storage unit 34 as the reference distance LR. Here, the predetermined printing speed at which the running of the web 14 is stable is, for example, 200 rpm when the machine speed during normal printing is 400 rpm, and this value is set in the reference distance setting means 32 in advance. Things. Further, the printing speed may be grasped by the machine speed, the plate cylinder speed or the like.

The upper limit relative distance setting means 32 and the lower limit relative distance setting means 33 are usually provided with a push button or a dial type input device provided in the operation panel of the offset rotary printing press 11,
Alternatively, it may be configured by a keyboard or the like, and may be an interactive input method while viewing the CRT screen.

The calculating means 37 stores a reference distance LR, an upper limit relative distance LH (> 0), and a lower limit relative distance LL from the reference distance storage unit 34, the upper limit relative distance storage unit 35, and the lower limit relative distance storage unit 36, respectively.
(<0) is read, the upper limit value LR + LH and the lower limit value LR + LL of the allowable range H are calculated, and the calculation results are sent to the deviation identifying means 40.

The departure discriminating means 40 has an upper limit value storage unit 41 and a lower limit value storage unit 42 for respectively storing the upper limit value LR + LH and the lower limit value LR + LL sent from the calculating means 37, and the distance detected by the distance sensor 20 is allowable. A deviation identifying unit 43 that identifies whether the deviation is out of the range H. Deviation identification unit 43
Reads the upper limit value LR + LH and the lower limit value LR + LL from the upper limit value storage unit 41 and the lower limit value storage unit 42, respectively, and scans the distance signal transmitted from the distance sensor 20 via an input interface (not shown) at a constant cycle. At regular intervals, it is determined whether the distance detected by the distance sensor 20 is between the upper limit value LR + LH and the lower limit value LR + LL, and whether the position of the web 14 is out of the allowable range H is determined. Is configured.

The out-of-paper determining means 52 determines whether the distance detected by the distance sensor 20 is between the upper limit value LR + LH and the lower limit value LR + LL, that is, within the predetermined allowable range H, based on the identification result of the departure identifying means 40. Is determined to be normal, and the detection distance by the distance sensor 20 is determined to be the upper limit value LR + LH and the lower limit value LR.
If the deviation from + LL is detected, it is determined that the web 14 has run out of paper, and an abnormality processing signal is output. In addition, the reference distance setting unit 31, the calculating unit 37, the reference distance storage unit 34, the upper limit relative distance storage unit 35, the lower limit relative distance storage unit 36 of the range setting unit 30, and the deviation identifying unit
The 40 departure discriminating units 43, the upper limit value storing unit 41, the lower limit value storing unit 42, and the out-of-paper determining unit 52 are each configured by a central processing unit such as a microcomputer and various memories connected thereto. ing.

In the present embodiment, an out-of-paper condition of the web 14 is detected and abnormal processing is performed as described below. FIG.
5 shows a schematic processing flow by the paper-out detecting device 50. First, when the offset rotary printing press 11 is started, the paper-out detecting device 50 is started (process S1). At this time, the upper limit relative distance setting means 32, the lower limit relative distance setting means
33, the upper limit relative distance LH and the lower limit relative distance LL are input and set in advance.

Next, the detection distance sent from the distance sensor 20 is scanned at regular intervals by the reference distance setting means 31 (process S2), and the printing speed of the offset rotary printing press 11 is set to a predetermined value (for example, machine speed). (At 200 rpm), the detected detection distance is written to the reference distance storage unit 34 as the reference distance LR (processing S3). The setting process of the reference distance LR (processing S2, S3) scans the distance detected by the distance sensor 20 for the first time when the printing speed of the offset rotary printing press 11 reaches a predetermined value (for example, 200 rpm at the machine speed). Then, the scan value may be written to the reference distance storage unit 34. Then, the calculating means 37 calculates the reference distance.
LR plus upper limit relative distance LH (> 0) to give a predetermined tolerance H
Is calculated (processing S4), and the lower limit relative distance LL (<0) is added to the reference distance LR, and the lower limit of the predetermined allowable range H is calculated.
LR + LL is calculated (process S5).

Thereafter, the detected distance sent from the distance sensor 20 is scanned at regular intervals by the departure identifying means 40 (process S6), and it is determined whether or not the scan value exceeds the upper limit LR + LH (process S7). If not, it is determined whether or not this scan value is smaller than the lower limit value LR + LL (step S8). If not, the paper-out determining means 52 determines that the web 14 is in a normal state. Move on to the next scan. On the other hand, the scan value is determined to be equal to the upper limit value LR + LH in the judgment of the process S7.
If it is determined that the web 14 has run out of paper, or if the scan value is determined to be smaller than the lower limit LR + LL in step S8, the paper-out determining means 52 determines that the web 14 has run out of paper and performs an abnormal process. A signal is output (process S9).

Finally, according to the abnormal processing signal from the paper-out determining means 52 of the paper-out detecting device 50, the offset rotary printing press is used.
At the same time as stopping the web 11, the web 14 is cut off by a paper cut (not shown) provided at each section of the offset rotary printing press 11, and abnormal processing such as generation of an alarm is performed.

According to this embodiment, the following effects can be obtained. That is, the paper breakage detecting device 50 detects the slack of the web 14 by detecting the distance to the web 14 with the distance sensor 20, and the detected distance is set to the predetermined allowable range H.
When it deviates from the upper limit value LR + LH and the lower limit value LR + LL, it is determined that the web 14 has run out of paper. Therefore, unlike the case of the conventional paper breakage detecting device 90 shown in FIG. Since the occurrence of a paper break can be detected in a state immediately below the paper break detection device 50, the paper break can be detected earlier than in the case of the conventional paper break detection device 90. For this reason, the time from the occurrence of an actual paper break to the time of performing the abnormal processing can be greatly reduced, and the amount of the web 14 wrapped around the rotating portion of the plate cylinder 15 or the blanket cylinder 16 of the offset rotary printing press 11 can be reduced. Can be reduced.

The paper breakage detecting device 50 is a distance sensor, which is a distance detecting means, as a deviation detecting means 51 for detecting whether or not the slack of the web 14 is out of a predetermined allowable range H.
Since 20 is used, the positions of the upper limit and the lower limit of the allowable range H can be set by specifying the numerical values of the distance (the upper limit and the lower limit). Therefore, the allowable range H can be arbitrarily set only by changing the numerical value, and the setting operation and the change operation itself can be easily performed.

Further, the paper-out detecting device 50 is provided with a reference distance setting means 31, an upper limit relative distance setting means 32, a lower limit relative distance setting means 33, and a calculating means 37, and these respective means have a predetermined allowable range. Since the setting of the upper limit value and the lower limit value of H is performed by designating the relative distance from the position of the web 14 during stable running, the position of the web 14 in the normal state is accurately grasped, and the upper limit value of the allowable range H and The lower limit can be set. For this reason, it is possible to more accurately detect the paper breakage. Then, the reference distance setting means 31 is configured to constantly input and monitor the printing speed signal and to set the detection distance by the distance sensor 20 when the printing speed reaches a predetermined value as the reference distance LR. ,
The reference distance LR, which is the position of the web 14 when the running is stable, can be automatically set.

FIG. 3 shows the results of a comparative experiment conducted to confirm the effects of the present invention. In this experiment, an out-of-paper detecting apparatus 50 according to the present invention and the conventional out-of-paper detecting apparatus 90 shown in FIG. 4 were provided in an offset rotary printing press, and the time required from the actual occurrence of out-of-paper to the out-of-paper detection was measured. The wavy line in the figure is the distance measurement data indicating the change over time in the position of the web. The distance measurement data rises simultaneously with the occurrence of the paper breakage, and it can be confirmed that the web has begun to loosen. In the paper out detecting device 50,
Paper shortage is detected immediately after the distance measurement data rises.
Seconds have passed. On the other hand, in the conventional paper-out detecting device 90,
At the time when the distance measurement data considerably fluctuates, the paper break is detected, and at this time, 0.69 seconds have elapsed since the actual paper break occurred. According to this comparison result, the paper break detection device 50 according to the present invention is more excellent than the conventional paper break detection device 90.
The time required to detect out of paper is reduced by 0.64 seconds. Accordingly, the time required for stopping the printing press is also reduced. This result shows that when the circumference of the plate cylinder is 546 mm and the rotation speed of the plate cylinder is 1000 rpm, it is improved by 5.82 m when converted to the travel distance of the web during normal printing (from 6.28 m to 0.46 m).
m), and the effect of the present invention is remarkably exhibited.

It should be noted that the present invention is not limited to the above-described embodiment, but includes other configurations capable of achieving the object of the present invention. For example, the following modifications are also included in the present invention. That is, the distance sensor 20, which is the distance detecting means, may be any type of sensor such as an ultrasonic type, an optical type, a magnetic type, and in other words, may be any sensor that can detect the distance to the web 14. In selecting such a distance sensor, the web
Consider the material of 14 (for example, paper, transparent film, opaque film, etc.) or the printing color to be printed on the web 14, and furthermore, install the ink mist, paper powder,
By considering whether it is a place where disturbances such as oil and water are added,
The reliability of detection can be further improved.

In the above embodiment, the distance sensor 20
Are provided below the web 14, but may be provided above the web 14, or may be provided on both sides depending on the detection method. Further, in the embodiment, the upper limit value and the lower limit value are set as the allowable range H, but it is not always necessary to set both the upper limit value and the lower limit value, and either one may be set. However, by setting the upper limit value and the lower limit value, it is possible to more reliably detect a paper break.

In the above embodiment, the range setting means 30
The reference distance setting means 31 detects the distance to the web 14 when the running is stable and uses this as the reference distance LR.The upper limit relative distance LH from the position of the web 14 to the upper limit position when the running is stable is the upper limit relative distance. The input is set by the setting means 32, and the lower limit relative distance LL from the position of the web 14 at the time of stable running to the lower limit position is input and set by the lower limit relative distance setting means 33,
The upper limit value and the lower limit value are calculated by the calculating means 37 based on these values to determine the allowable range H. However, the upper limit value and the lower limit value based on the relative distance from the position when the running is stable are described. Instead of the setting method, a range setting unit that directly inputs an absolute value (distance) to the upper limit value storage unit 41 and the lower limit value storage unit 42 and sets the upper limit value and the lower limit value may be used. However, if the setting based on the relative distance from the position when the running is stable is performed, it is possible to detect the paper break more accurately. Further, without providing the range setting means 30, the upper limit value and the lower limit value are stored in the upper limit value storage unit 41 and the lower limit value storage unit 42.
May be set in advance. For example, the upper limit value and the lower limit value may be written in advance in a ROM (read only memory) or a program. However, it is preferable that the upper limit value and the lower limit value are input and set, so that the setting can be freely changed.

Further, in the range setting means 30 of the embodiment,
The upper limit relative distance setting means 32 and the lower limit relative distance setting means 33 are provided, and the upper limit relative distance LH and the lower limit relative distance LL are input and set by these means. Without providing the means 33, the upper limit relative distance LH and the lower limit relative distance LL may be written in advance in a ROM (read only memory) or a program. However, it is desirable to provide the upper-limit relative distance setting means 32 and the lower-limit relative distance setting means 33, so that the upper-limit relative distance LH and the lower-limit relative distance LL can be freely changed. Furthermore, the reference distance setting means 31 of the embodiment is configured to constantly input and monitor the printing speed signal and automatically set the reference distance LR when the printing speed reaches a predetermined value. The timing for setting the reference distance LR may be determined by a human. But,
It is desirable that the setting of the reference distance LR be automatically performed so that no human operation is required.

In the above embodiment, the range setting means 30
The upper limit value and the lower limit value are calculated and calculated by the calculation means 37, and the upper limit value storage unit 41 and the lower limit value storage unit 42 of the deviation identification means 40 are calculated.
The calculation means 37 and the upper limit value storage unit 4
1. Without providing the lower limit value storage unit 42, the departure identification unit 43 of the departure identification unit 40 is provided with the reference distance storage unit 34 and the upper limit relative distance storage unit 35 of the range setting unit 30 for each scan (each time of identification of a fixed cycle). ,
The reference distance LR, the upper limit relative distance LH, and the lower limit relative distance LL may be read from the lower limit relative distance storage unit 36 to calculate and calculate the upper limit and the lower limit.

In the above embodiment, the paper-out detecting device 50 is used.
Is provided between the dryer 13 and the printing unit 12, but may be provided at another location, for example, between the printing units 12. Then, the paper-break detecting device 50 of the present invention and the conventional paper-break detecting device 90 of FIG. 4 may be combined and disposed in a printing press. For example, a long device such as the dryer 13 in which the effect of the present invention is most remarkably obtained. May be installed in front of the printer, and a conventional paper-out detection device 90 may be installed in other places such as between the printing units 12.

Further, in the above embodiment, the paper-out detecting device
50 is provided in the offset rotary printing press 11, but the paper break detection device of the present invention is applicable to any printing press such as a gravure rotary printing press as long as it is a printing press that handles continuous paper with a possibility of paper breakage. May be.

In the above-described embodiment, the paper-out detecting device 50 is used.
Is a distance sensor that is a distance detecting means.
Although it has been configured by 20 or the like, other configurations may be used as long as it can detect whether or not the web 14 deviates from a predetermined allowable range. A sensor may be provided and a deviation detecting means configured to detect a deviation of the web 14 when the web 14 comes into contact with the contact type sensor, or a laser in parallel with the web 14 at the upper and lower positions of a predetermined allowable range. Deviation detecting means may be configured to run light and detect deviation of the web 14 when the web 14 crosses the laser beam. In these cases, the allowable range can be changed by raising or lowering the installation position of the contact sensor or the laser light passage position.

[0037]

As described above, according to the present invention, it is determined that the position of the continuous paper has deviated from the predetermined allowable range, and it is determined that the continuous paper has run out. The time can be detected, and the amount of continuous paper wrapped around the printing machine can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a schematic flow of paper out detection according to the embodiment.

FIG. 3 is an explanatory diagram of a comparative experiment between the embodiment and a conventional example.

FIG. 4 is a configuration diagram showing a conventional example.

FIG. 5 is an explanatory diagram of a state in which continuous paper is rolled up according to the conventional example.

[Explanation of symbols]

 11 Offset rotary printing press 12 Printing unit 13 Dryer 14 Web (continuous paper) 20 Distance sensor as distance detecting means 30 Range setting means 31 Reference distance setting means 32 Upper limit relative distance setting means 33 Lower limit relative distance setting means 37 Calculation means 40 Departure Identification means 50 Paper break detection device 51 Departure detection means 52 Paper break judgment means H Allowable range LR Reference distance LH Upper limit relative distance LL Lower limit relative distance

Continuation of the front page (56) References JP-A-1-168453 (JP, A) JP-A-4-214354 (JP, A) JP-A-3-180347 (JP, A) JP-A-61-196031 (JP) , U) Jpn. Sho 62-96054 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 33/18 B65H 43/04

Claims (3)

(57) [Claims] 1. A deviation detecting means for detecting whether or not the position of a continuous sheet in a direction intersecting the paper surface during printing deviates from a predetermined allowable range, and detecting a break of the continuous sheet based on a signal from the deviation detecting means. determining possess a piece of paper determination means, before
The deviation detecting means is provided for detecting a deviation from a predetermined position to the continuous paper.
Distance detecting means for detecting the distance in the direction intersecting the paper surface;
The distance detected by the separation detecting means deviates from the allowable range.
This and a deviation identifying means for identifying whether it is <br/> a piece of paper detection apparatus for a printing press according to claim. 2. The apparatus according to claim 1, wherein said deviation detecting means sets said allowable range.
And a range setting unit for setting the range.
The distance detecting means when the running of the continuous paper is stable;
Reference distance setting means for setting a distance to the continuous paper;
The upper limit of the permissible range is determined from the position when the running of the continuous paper is stable.
Upper limit relative distance setting means for setting the relative distance to the position
And the permissible range from the position when the running of the continuous paper is stable.
To set the relative distance to the lower limit position of
Setting means, these reference distance setting means and the upper limit relative distance.
Each set by the separation setting means and the lower limit relative distance setting means
Calculate the upper and lower limits of the allowable range based on the distance
And a calculating means for detecting the paper cut of the printing press. 3. The paper-out detecting device for a printing press according to claim 2, wherein said reference distance setting means includes a reference distance setting unit.
Monitor by inputting the print speed signal of the main unit and check the print speed.
The distance detected by the distance detecting means when a predetermined value is reached
Is set as the reference distance .