JP3435563B2 - Sheet conveyance status 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 a sheet conveying state detecting device for determining a conveying state of a sheet conveyed with a gap on a high speed conveying means of a theta.

[0002]

2. Description of the Related Art At the final stage of the rotary offset printing equipment,
A theta may be installed in which the printing web fed from the printing press unit is cut into a predetermined length into individual sheets, and the sheets are sequentially stacked on the stack portion. Figure 6
FIG. 6 is an explanatory diagram showing a conventional theta 1. Theta 1
Is a cut portion 4 having a fly knife 3 for cutting a printing web 2 conveyed at high speed at a printing speed into a sheet having a predetermined length, and a sheet 5 cut by the cutting portion 4.
Is provided to the stack unit 7. Then, in the transporting section 6, tension is applied to the printing web 2 so that the cut length in the cutting section 4 does not vary, and in order to set the timing when the sheets 5 are stacked at the low speed section in the subsequent stage. Sheet 5 at a speed slightly faster than the printing speed
A high-speed transport belt 8 for high-speed transport and a low-speed transport belt 9 for lowering the transport speed to a speed that does not affect the stacking due to stacking on the stack unit 7 in the final stage.

In the above construction, the printing web 2 conveyed at high speed at the printing speed is cut by the fly knife 3 of the cutting section 4 into sheets 5 of a predetermined length. The cut sheet 5 is transported by the high-speed transport belt 8. As described above, since the high speed transport belt 8 is slightly faster than the printing speed, the sheet 5 on the high speed transport belt 8 is
They are transported with a gap. Then, the sheets 5 are decelerated by the low speed conveyor belt 9 and are stacked in the stack portion 7.

[0004]

However, the conventional theta has the following problems. Although the web conveyed to the theta has been dried, the web after cleaning the blanket cylinder contains the solvent and is therefore often moist. Therefore, the web is easily wrapped around equipment such as a fly knife during cutting. In addition, if the web is charged with static electricity, it may stick to the guide surface of the theta or the cover due to the static electricity and may not be conveyed. If the theta is operated while leaving such a state, the sheet may be wound around the fly knife or the like and jamming may occur.
When such jamming or the like occurs, the web cannot be conveyed and the devices inside the theta may be damaged.

Further, when jamming occurs, the jammed web becomes so-called waste paper and cannot be used, which causes a problem in terms of cost. Further, conventionally, there is no means for immediately stopping even if jamming occurs, and if the theta operation continues after the occurrence of jamming, the jamming area expands, making it difficult to determine why jamming has occurred. Met. for that reason,
Even after removing the jammed sheet, jamming occurs again at the same location, which is a serious problem in terms of work.

Further, the sheet may be conveyed without being cut by the fly knife. In this case as well, the sheet may be clogged in the low-speed conveying means in the subsequent stage, which is a problem. Further, since a sheet having a poor cutting must be cut again, early detection has been desired. Also, due to the above-mentioned moisture of the sheet and poor adjustment of the fly knife, the cutting of the sheet becomes insufficient,
The sheet may be misaligned with the transport direction. At this time, the sheet may be jammed when moving from the high speed conveyor belt to the low speed conveyor belt, and early detection is desired.

Therefore, in order to prevent the above-mentioned problems from occurring, a worker who monitors the transport state is arranged in the theta. However, since the worker must constantly monitor, the burden on the worker is large. There was also a demand for improvement in terms of personnel costs.

It is an object of the present invention to provide a sheet conveyance state detecting device for detecting a sheet conveyance state such as jamming, defective cutting of a sheet, or deviation during sheet conveyance.

[0009]

In order to achieve the above object, in the sheet conveying state detecting device according to the present invention, at least one detecting means for detecting the presence or absence of a sheet on the high speed conveying means is set in the conveying direction. The detecting means is arranged so that the detecting means is arranged so that the distance between the detecting means is not less than the distance between the sheets and not more than the length in the sheet conveying direction, and the presence or absence of jamming or cutting failure is determined according to the detection signal of the detecting means. It was configured to be connected with.

[0010]

Further, the detection means for detecting the presence / absence of a sheet on the high-speed conveyance means are arranged so that at least one pair is arranged in each of the conveyance direction and the transverse direction, and the arrangement interval of the pair of detection means in the conveyance direction is set. The distance between the sheets should be equal to or greater than the length in the sheet conveying direction, and the interval between the pair of detection means in the transverse direction should be equal to or less than the width of the sheet, so that jamming or cutting failure may occur depending on the detection signal of the detection means. A configuration in which a determination unit that determines the presence or absence is connected to the conveyance direction detection unit, and a determination unit that determines whether or not there is a deviation in the sheet conveyance direction in accordance with a detection signal from the detection unit is connected to the transverse direction detection unit. And

Further, at least one detecting means for detecting the presence / absence of the sheet on the high-speed conveying means is arranged, and the reference value of the normal conveying state of the sheet is compared with the detection signal of the detecting means to detect jamming or cutting failure. The comparison / determination means for determining the presence / absence is connected to the detection means.

Further, in addition to the detecting means, a new detecting means is arranged in the transverse direction of the sheet conveying path, and it is judged whether or not there is a deviation in the conveying direction of the sheet according to a detection signal from the detecting means. The means is connected to the detection means.

[0014]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, the peripheral portion of the lower high-speed transport belt in which the detection means in the embodiment of the present invention is arranged will be described with reference to FIG. Lower high speed conveyor belt 28
Is wound around a pair of rolls 24, 26. The roll 24 on the inlet side is a driven roll and the roll 26 on the outlet side is a drive roll. Also, the lower high speed conveyor belt 28
A fly knife (not shown) for cutting the web into sheets 22 is provided on the inlet side of the sheet. And
A low speed conveyor belt is provided on the exit side of the lower high speed conveyor belt 28.

The lower high-speed transport belt 28 is orbitally driven at a speed slightly higher than the printing speed (web transport speed). For this reason, the sheets 22 sent to the lower high-speed transport belt 28 are transported so that there is a gap therebetween.
Lower high speed transport belt 28 and upper high speed transport belt 29
Has a structure in which a plurality of tape-shaped thin belts are arranged at appropriate intervals. Therefore, devices can be arranged in the respective transport belts 28 and 29 as needed. In this embodiment, photoelectric sensors (hereinafter referred to as “sensors”) S1 to S, which are detection means, are provided in the upper high-speed transport belt 29 on the lower high-speed transport belt 28.
4 are arranged.

The arrangement of the sensors in this embodiment will be described. 2A is a front view showing the arrangement of the photoelectric sensors S1 to S4 in the present embodiment, and FIG. 2B is a side view showing the arrangement of the photoelectric sensors S1 to S4 in the present embodiment. In this embodiment, two sets of the sensors S1 to S4 are arranged in the transport direction 23 inside the upper high-speed transport belt 29 on the lower high-speed transport belt 28 which is a high-speed transport means. In this embodiment, as shown in FIG. 2B, the sensors S1, S2 (S3, S4)
The arrangement interval L2 is not less than the gap L1 between the sheets 22 and is not more than the length L3 in the conveyance direction of the sheets 22. In addition, the sensor S which is the detection unit in the present embodiment
Two sets (S1 and S3, S2 and S4) of 1 to S4 are arranged also in the direction orthogonal to the transport direction 23. The arrangement interval L4 of the sensors S1, S3 (S2, S4) is within the sheet width L5. In the present embodiment,
It uses a reflective sensor. The sensor in this embodiment is digitally controlled.

FIG. 1 is a conceptual diagram of the sheet conveyance state detection device 20 in this embodiment. In the present embodiment, as described above, the two sets of the sensors S1 and S2 and S3 and S4 determine the presence or absence of jamming or cutting failure according to the detection signal of the sensor (hereinafter referred to as "jamming determination means"). (See FIG. 1 for simplification, only the connection of S1 and S2 is shown). The jamming determination means 30 is connected to the display plate 34 on the output side. The display plate 34 displays “good” and “bad” in the transport state according to the output of the jamming determination means 30. The jamming determination means 30 is connected to the actuator 38 and the motor 40 on the output side. The actuator 38 and the motor 40 are connected to the theta 41 on the output side, respectively. The actuator 38 controls the operation of the theta 41 according to the output of the jamming determination means 30. Then, the motor 40 stops the operation of the theta 41 according to the output of the jamming determination means 30.

The jamming determination means 30 will be described in more detail. FIG. 3A is an explanatory diagram of the jamming determination means 30 in the present embodiment (S1 and S2 for simplicity).
Only shows the connection). The jamming determination unit 30 in the present embodiment mainly includes a sensor output determination unit 30a, a number-of-times determination unit 30b, and an output control unit 30c. The sensor output determination unit 30a includes the sensors S1 and S on the input side.
It is connected to 2. The sensor output discriminating unit 30a inputs the detection signals of the sensors S1 and S2 and discriminates whether the sheet 22 is in a conveyed state or not (discrimination step will be described later). Further, the output side of the sensor output discriminating unit 30a is connected to a frequency discriminating unit 30b and an output control unit 30c, respectively. The output control unit 30c is connected to the output side of the number-of-times determination unit 30b. When both the sensors S1 and S2 detect the sheet 22, the signal from the sensor output determination unit 30a is transmitted to the number-of-times determination unit 30b. Further, when the sheet 22 is not detected by one or both of the sensors S1 and S2, the signal of the sensor output determination unit 30a is transmitted to the output control unit 30c. Output control unit 30c
On the outlet side of, the actuator 38 and the motor 40 described above are connected. The output of the output control unit 30c controls the operation of the theta 41 via the actuator 38 and the motor 40.

Further, in this embodiment, as shown in FIG. 1, two sets of sensors S1 and S3 and S2 and S4 are provided.
It is connected to a judgment means 32 (hereinafter, referred to as “deviation judgment means”) for judging the deviation during conveyance of the sheet 22 in accordance with the detection signal of the sensor (for simplicity, in FIG. 1, S is used).
Only the connection of 1 and S3 is shown). On the output side of the deviation judging means 32, like the jamming judging means 30, the display plate 36, the actuator 38, and the motor 40 are provided.
Are connected.

The deviation determining means 32 will be described in more detail. FIG. 4A shows the deviation determination means 3 in this embodiment.
2 is an explanatory view, and FIG. 4B shows the sensor S in the present embodiment.
It is explanatory drawing which shows 1, S3, an origin, and the output in a detector. The deviation determination means 32 in the present embodiment mainly includes time measuring units A to C, a comparison subtraction unit 32a, and a comparison control unit 32b. The time measuring units A to C are connected to the sensors S1 and S3 on the input side, respectively. Further, detectors A to C are connected to the input sides of the time measuring units A to C, respectively. The detectors A to C generate a pulse at a predetermined time interval during an output interval 1R of an origin connected to a reference barrel (for example, a fly knife). The time measuring units A to C measure the time when the sensor detects the sheet 22 with the time of the detectors A to C as a reference.
The time measurement unit A measures the sheet detection time T1 of the sensor S1, and the time measurement unit B measures the sheet detection time T2 of the sensor S3. Then, the time measuring unit C uses the sensors S1 and S3.
And the sheet detection time W common to the above.

The time measuring units A, B and C are connected to the comparison / subtraction unit 32a on the output side. The comparison / subtraction unit 32a compares the start times of the sheet detection time T1 measured by the time measurement unit A and the sheet detection time T2 measured by the time measurement unit B, and determines the earlier start time as the time measurement unit C. Subtract by the common sheet detection time W measured in.

The comparison controller 32b is connected on the input side to the comparison / subtraction unit 32a and the reference value memory, and is connected on the output side to the actuator 38 and the motor 40.
In the reference value memory, a deviation allowable value that is allowable in sheet conveyance is input. The comparison control unit 32b compares the subtraction value with the deviation allowable value of the reference value memory and outputs a control signal to the actuator 38 and the motor 40.

The operation of the sheet conveyance state detecting device 20 configured as described above is as follows. The web sent from the printing machine is cut into sheets 22 by a fly knife (not shown). The cut sheet 22 is conveyed between the upper high speed conveyor belt 29 and the lower high speed conveyor belt 28. At this time, as described above, the lower high speed conveyor belt 28
Is rotating at a speed slightly higher than the web transfer speed (fly knife rotation speed), the cut sheet 22
The two are transported on the lower high-speed transport belt 28 with a gap L1.

As described above, the sensors S1 to S4, which are the detection means in the present embodiment, use the lower high speed conveyor belt 28.
The sheet 22 is arranged on the conveyance path of the sheet 22, and the sheet 22 conveyed to the sensor arrangement position is detected at each position. The sensors S1 to S4 detect the presence or absence of the sheet 22 to detect the jamming determination means 30 and the deviation determination means 3.
2 transmits the detection signal. The jamming determination means 30
The deviation judging means 32 judges the presence or absence of jamming, cutting failure, and deviation with respect to the conveyance direction according to the detection signal of the sensor as follows.

The process of detecting jamming and cutting defects in this embodiment will be described. In this embodiment,
The sensor S arranged in the transport direction as shown in FIG.
1 and S2 are connected to a jamming determination means 30 for determining the presence or absence of jamming or cutting defects. In FIG. 3B, the case where the sensor detects the sheet 22 is “◯”,
The case where it was not detected is indicated by "x". As described above, the distance L2 between the sensors S1 and S2 is set to the sheet 22.
The distance is equal to or greater than the gap L1 and is within the length L3 of the sheet 22 in the conveyance direction. Therefore, if the sheet is in the normal transport state, the sheet 22 is detected by one of the sensors (for example, S1).
When the sheet is detected, the other sensor (for example, S2) should not detect the sheet 22. Therefore, as shown in FIG. 3B, when one sensor detects “◯” and the other sensor detects “x”, the jamming determination means 30 determines that the transport state is normal, and the display plate 34 displays the jammed state. In addition to displaying “Good”, the actuator 38 and the motor 40 continue to convey the sheet.

On the other hand, the sensors S1 and S2 are both seat 2
When 2 is not detected, that is, when the sensors S1 and S2 both detect “x”, the jamming determination unit 30 determines that the sheet 22 is not conveyed, that is, so-called jamming occurs. In this case, the jamming determination means 30 causes the display plate 34 to display "defective", and the actuator 38 and the motor 40 stop the operation of the theta 41 to prevent the jamming from expanding.

The sensors S1 and S2 are both seat 2
When 2 is detected, that is, when the sensors S1 and S2 both detect “◯”, the jamming determination means 30 determines as follows. When both the sensors S1 and S2 detect the sheet 22, the sheet 22 may be conveyed without being cut, but the sheet 22 may be cut and the sheet 22 may be continuously sent. To be Therefore, in the present embodiment, the case where both S1 and S2 detect “◯” is within the set number of times (for example, 1 to 2).
If the number of times is (1), the jamming determination means 30 determines that the transport state is normal, and continues the operation of the theta 41 as described above. When the case where both S1 and S2 detect “◯” occurs continuously over the set number of times, the jamming determination unit 30 determines that the conveyance state is abnormal, and the operation of the theta 41 is performed as described above. I'm trying to stop it.

The presence / absence of deviation of the sheet with respect to the conveying direction is determined as follows. In the embodiment, FIG.
The sensor S1 arranged in the transport direction as shown in FIG.
The step S3 is connected to the deviation judging means 32 for judging whether or not there is a deviation in the sheet conveying direction. As described above, the arrangement interval L4 of the sensors S1 and S3 arranged in the transverse direction of the sheet conveyance path is smaller than the conveyance width L5 of the sheet 22. As a result, if the sheet 22 is conveyed normally, both the sensors S1 and S3 can detect the sheet.

The deviation judging means 32 in this embodiment is
The difference between the outputs of the sensors S1 and S3 is compared with a reference value to determine whether there is a deviation. In the present embodiment, as described above, the output interval 1R at the origin is set to the rotation cycle of the fly knife. Then, the detectors A to C output pulses at predetermined intervals within the interval 1R. Then, the time measuring unit detects the sheet detection time with reference to one pulse interval of the detectors A to C. That is, the sheet detection time T1 of the sensor S1 is detected by the time measuring unit A, and the sheet detection time T2 of S3 is detected by the time measuring unit B. The time measuring unit C detects a common portion W of the sheet detection times T1 and T2 of the sensor. Then, the comparison / subtraction unit 32a compares the start times of the sheet detection times T1 and T2 and subtracts the common time W from the earlier one (T1 in the present embodiment). Then, in the comparison control unit 32b, the difference T1
-W is compared with the deviation allowable value of the reference value memory to judge the conveyance state and control the operation of the theta 41. That is, as compared with the above-mentioned reference value, if the deviation is within the reference value, the deviation determination means 32 determines that there is no deviation and continues the operation of the theta 41. If it exceeds the reference value, the deviation determination means 32
The actuator 38 and the motor 40 are judged to have come off.
Stops the operation of the theta 41.

As described above, by detecting the presence / absence of a sheet on the high-speed conveyance belt, it is possible to detect a jamming of the sheet or a cut defect of cutting at an early stage. When it is determined that the transport state is abnormal, the operation of the printing press is stopped, so that the operation can be restarted early and the amount of damaged sheets can be greatly reduced. Further, since the wear of the machine is minimized, the life of the machine can be greatly extended.

In the present embodiment, the case has been described in which four sensors are arranged so that two sets are provided in each of the transport direction and the transverse direction, and jamming, cutting failure, and deviation during transport are detected. However, if the sensors are arranged at the above-mentioned arrangement intervals so as to form one set in the conveying direction, jamming and cutting defects can be detected. Further, if the sensors are arranged at the above-mentioned arrangement intervals so as to form one set in the transverse direction of conveyance, it is possible to detect a deviation during conveyance. Therefore, by arranging the three sensors so as to form a triangle along the conveyance path, and connecting each sensor as a set to the deviation judging means and the jamming judging means, jamming, cutting failure, and conveyance A shift can be detected.

A modified example of the present invention will be described.
FIG. 5A is an explanatory diagram showing the sheet conveyance state detecting device according to the second embodiment of the present invention, and FIG. 5B is an explanatory diagram showing the output at the sensor S5 and the origin. In the second embodiment of the present invention, as shown in FIG. 5A, one sensor S5 is installed in the sheet conveying path 2 of the lower high-speed conveying belt 28.
It is located above 3. Then, in the sheet conveyance state detecting device according to the present embodiment, the comparison / determination unit 50 determines jamming or cutting failure.

The comparison / discrimination means 50 mainly comprises a comparison section 50a and an output control section 50b. The comparison unit 50a
Connects the sensor S5 to the reference value memory on the input side. The output control unit 5 is provided on the output side of the comparison unit 50a.
0b is connected. In the comparison section 50a, as shown in FIG. 5B, the sheet 2 detected by the sensor S5.
The carrying time of 2 is compared with the reference value in the normal carrying state of the reference value memory. Then, the presence or absence of jamming or cutting defects is determined and output to the output control unit 50b. A display plate 34, an actuator 38, and a motor 40 are connected to the output side of the output control section 50b, respectively, and control signals are output to the respective output sides.

FIG. 5C is an explanatory view showing the sheet conveyance state detecting device in the third embodiment of the present invention.
In the present embodiment, in addition to the sensor S5, a sensor S6, which is a new detection unit, is arranged in the transverse direction of the conveyance path of the sheet 22. In this embodiment,
The comparison determination means 50 is connected to the sensor S5, and the deviation determination means 32 is connected to the sensors S5 and S6. As a result, similarly to the first embodiment, it is possible to control the operation of the theta by detecting misalignment during conveyance of the sheet 22, jamming, defective cutting, and the like.

Although the embodiment of the present invention has been described above, the detection means is not limited to the sensor,
For example, a camera may be used. When a sensor is used, a photoelectric sensor can be preferably used, but the sensor is not limited to this, and an ultrasonic sensor, for example, may be used. Further, a reflective type sensor can be preferably used from the viewpoint of cost, but a transmissive type sensor may be used. Further, in the embodiment, the sheet detection time is compared and subtracted to determine the sheet misalignment, but not limited to this, for example, the sheet detection time is changed to the number of pulses of the detector to determine the sheet misalignment. Good.

[0036]

As described above, in the sheet conveying state detecting device of the present invention, by detecting the presence or absence of the sheet on the high-speed conveying belt, it is possible to detect the jamming of the sheet, the cutting defect, etc. at an early stage. it can. When it is determined that the transport state is abnormal, the operation of the printing press is stopped, so that the operation can be restarted early and the amount of damaged sheets can be greatly reduced. Also,
Since the wear of the machine is minimized, the life of the machine can be significantly extended. Further, since it is not necessary for the worker to constantly monitor the theta, the work load on the worker can be reduced.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a sheet conveyance state detection device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an arrangement form of sensors according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of jamming determination means according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of a deviation determination unit according to the first embodiment of the present invention.

FIG. 5 is a conceptual diagram of a sheet conveyance state detection device according to second and third embodiments of the present invention.

FIG. 6 is an explanatory diagram of a conventional theta.

[Explanation of symbols]

1 theta 2 web 3 fly knife 4 cut section 5 sheets 6 Transport section 7 Stack part 8 High speed conveyor belt 9 Low speed conveyor belt 20 Sheet conveyance state detection device 22 sheets 23 Transport direction 24 Driven Roll 26 Drive roll 28 Conveyor belt 30 Jamming discrimination means 32 Deviation judging means 34 display board 36 display board 38 Actuator 40 motor 41 Theta 50 Comparison discrimination means

Claims (4)

(57) [Claims] 1. A sheet conveying state detecting device for determining a conveying state of a sheet conveyed with a gap on a high-speed conveying means of a theta, wherein a detecting means for detecting presence or absence of a sheet on the high-speed conveying means is a conveying direction. At least one set of the detecting means is arranged so that the arrangement interval of the detecting means is not less than the gap between the sheets and not more than the length in the sheet conveying direction, and the presence or absence of jamming or cutting failure is determined according to the detection signal of the detecting means. Is connected to the detection means. 2. A sheet conveying state detecting device for determining a conveying state of a sheet conveyed with a gap on the high speed conveying means of a theta, wherein a detecting means for detecting the presence or absence of a sheet on the high speed conveying means is a conveying direction. And the transverse direction, and at least one pair of detecting means in the conveying direction is arranged such that the interval between the detecting means is not less than the gap between the sheets and not more than the length in the conveying direction of the sheet. The arrangement interval of the pair of detection means is equal to or less than the width of the sheet, and the determination means for determining the presence or absence of jamming or cutting failure according to the detection signal of the detection means is connected to the detection means in the conveyance direction, and A sheet conveying state detecting device, wherein a judging means for judging whether or not there is a deviation of a sheet in the conveying direction according to a detection signal is connected to the transverse direction detecting means. Wherein at least one place a detecting means for detecting the presence or absence of a sheet on the high-speed conveyor means, the reference value of the properly transported state of the seat and of the detection means detecting signal and compared to jamming or cutting failure by the 3. A comparison / determination means for determining the presence or absence of the above is connected to the detection means.
Placing the sheet transport state detection device. 4. A determination for arranging a new detection means in addition to the detection means in a transverse direction of the sheet conveyance path, and for determining whether or not there is a deviation in the conveyance direction of the sheet according to a detection signal from the detection means. The sheet conveyance state detecting device according to claim 3 , wherein the means is connected to the detecting means.