JP2000015786A - Sheet feeding fault detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding fault detector for accurately deciding a feeding fault of a sheet-like material without influence even when a type of the sheet-like material is changed or the sheet is stained. SOLUTION: A first reflecting plate 4 and a second reflecting plate 5 are arranged at both sides of a gripper shaft 2 in a groove 3 in which the shaft 2 is installed on an impression cylinder 1 supported between right and left frames of a sheet-fed printer with a reversing mechanism. Meanwhile, a first sensor 7 and a second sensor 8 made of reflection type photoelectric switches are arranged so as to receive reflections from the plate 4 at predetermined rotary angel positions of the cylinder 1. Accordingly, the plate 4 is for sensing a sheet drop. When the sheet P is disposed on the cylinder 1, the plate 4 is not observed from the sensor 7 by interrupting it via the sheet P, but since the sensor 8 is obliquely disposed, the sensor 8 can always observe the plate 4 even in the case of the presence or the absence of the sheet P. The plate 5 is installed separately from the plate 4 for sensing stains of the sensors 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding abnormality detecting apparatus for detecting a paper drop phenomenon in which a sheet falls without being held in a sheet-fed printing press or the like.

[0002]

2. Description of the Related Art As this kind of detecting device, there are, for example, those disclosed in Japanese Utility Model Laid-Open No. 62-170226 and Japanese Patent No. 2666146. Is detected by a paper presence / absence detector (the former is referred to as a reflection type light emitting / receiving device, and the latter is referred to as a reflection type photoelectric sensor) to determine the presence / absence of paper.

However, in the above-described conventional paper presence / absence detector, when the paper is stained with, for example, ink or oil (grease), there is a possibility that it is determined that there is no paper even if there is paper. there were. A similar problem occurs when the type of paper is changed (when a printed material such as colored paper, glossy paper, or paper having a mirror surface is used). Furthermore, the conventional paper presence / absence detector has a risk of determining that there is no paper even if paper is present due to paper dust or the like.

There is also a method for determining the presence or absence of paper using a digital pressure sensor. This is based on changes in pressure due to changes in paper quality, paper thickness, paper size, and changes in the surrounding environment (barometric pressure, temperature, humidity, etc.). There is a problem that operation failure occurs due to factors such as.

Accordingly, the present invention provides a sheet feeding abnormality detecting device which can accurately determine a feeding error of a sheet material without being affected even when the type of the sheet material is changed or when the sheet material becomes dirty. The purpose is to provide. Another object of the present invention is to provide a sheet feeding abnormality detecting device capable of determining an abnormality of the abnormality detecting device itself.

[0006]

In order to achieve the above object, a sheet feeding abnormality detecting device according to the present invention detects a sheet-like material sent to a transport cylinder by a sheet-like material detecting device, and detects the sheet-like material. In the sheet feeding abnormality detecting device which determines the feeding abnormality of the sheet-like object based on a detection output from the object detecting device, the sheet-like object detecting device transmits the light from the light emitting device and the light emitting device only in the first direction. A light-emitting-side deflection filter, a light-receiving device, and a light-receiving-side deflection filter that transmits only light in a second direction different from the first direction returning to the light-receiving device; And a reflecting member that reflects the light deflected in the first direction by at least the light deflected in the second direction is disposed at a position of the transport cylinder covered by the sheet-like material.

According to this, when there is a sheet-like material,
Regardless of the state and condition of the sheet, the light in the same direction as the light emitted from the light emitter returns to the light receiver and is not received, so that the sheet detector does not output. vice versa,
When there is no sheet-like object, the sheet-like object detection device outputs since the light emitted from the light projector and the light in a different direction from the light emitter return to the light receiver and are received by the reflection member.

In addition, a sheet-feeding abnormality detecting device which detects a sheet-like material sent to a transport cylinder by a sheet-like material detecting device and judges a feeding abnormality of the sheet-like material based on a detection output from the sheet-like material detecting device. , Wherein the sheet comprises: a first reflecting member disposed at a position of the transport cylinder covered by the sheet-like material; a light emitter and a light receiver for receiving light reflected by the first reflecting member. A first sheet-like object detection device for detecting the presence or absence of an object, a light emitter for receiving light reflected by the first reflection member, and a dirt on the first reflection member. A second sheet-like object detection device.

According to this, the presence / absence of a sheet-like object is detected by the first sheet-like object detection device, and the second sheet-like object detection device is at the same time as the first sheet-like object detection device. If it is the output result, it is determined that the first reflecting member is dirty.

A second reflection member is provided at a position of the transport cylinder that is not covered by the sheet-like material, and the presence or absence of the sheet-like material is determined based on a detection output result from the first sheet-like material detection device. And a control means for judging dirt attached to at least one of the first and second sheet-like object detection devices or the first and second reflection members.

[0011] According to this, the presence or absence of the sheet-like object is detected by the first sheet-like object detection device, and the control means includes:
Based on output results of the first and second sheet-like object detection devices to the first and second reflection members, at least one of the first and second sheet-like object detection devices or the first and second reflection members The stain adhering to one is determined.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sheet feeding abnormality detecting apparatus according to the present invention will be described in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention, FIG. 2 is an electric circuit diagram of the control means, and FIG. 3 is a schematic configuration diagram of the sensor.

As shown in FIG. 1, an impression cylinder 1 supported between left and right frames of a sheet-fed printing press with a reversing mechanism has a claw shaft in a groove 3 in which a claw shaft 2 is installed. A first reflector 4 and a second reflector 5 as reflection members are disposed on both sides of the second reflector 2. In the illustrated example, the first reflector 4 is mounted on the claw bar 6, and the second reflector 5 is mounted on a reflector mounting plate (not shown) fixed to the groove 3. A large number of claws 2a are fixed to the claw shaft 2 at predetermined intervals in the axial direction.

On the other hand, a first sensor 7 and a second sensor 8 as a sheet-like object detecting device are arranged so as to receive the reflection from the first reflecting plate 4 at a predetermined rotation angle position of the impression cylinder 1. You. That is, the second sensor 8 is positioned obliquely with respect to the first reflection plate 4. Note that these two sensors 7, 8
Is supported by a frame (not shown) via a bracket or the like.

Therefore, the first reflecting plate 4 is for detecting paper drop, and when the paper P is on the impression cylinder 1, the first reflecting plate 4 is blocked by the first sensor 7 and the first reflecting plate. 4 cannot be seen, but since the second sensor 8 is arranged obliquely, the paper P
The first reflection plate 4 can always be seen regardless of the presence or absence. Further, the second reflection plate 5 is provided separately from the first reflection plate 4 and is for detecting dirt on the first and second sensors 7 and 8.

The first sensor 7 and the second sensor 8 are arranged as shown in FIG.
As shown in the figure, the light projecting device 9A, the light projecting-side deflection filter 9a that transmits light from the light projecting device 9A only in the first direction, the light receiving device 9B, and the first direction returning to the light receiving device 9B. Is a reflection-type photoelectric switch including a light-receiving-side deflection filter 9b that transmits only light in a different second direction.

The first reflector 4 and the second reflector 5
Reflects light deflected in the first direction by the light-projecting-side deflection filter with at least light deflected in the second direction.

As shown in FIG. 2, the detection signals (outputs) of the first sensor 7 and the second sensor 8 together with a pulse signal of a rotary encoder 11 for detecting the rotation angle of the impression cylinder 1 serve as control means. It is input to the control circuit 10.

The control circuit 10 determines the presence or absence of the paper P based on the output results of the first sensor 7 and the second sensor 8, and determines the presence and absence of the paper P, the first and second sensors 7, 8 and the first and second sensors. The dirt on the second reflectors 4 and 5 is determined, and if the result of the determination is abnormal, a lamp is displayed and the machine is stopped.

More specifically, the output result of the first sensor 7 is:
When the first and second gates 13a, 13b corresponding to the first and second reflectors 4, 5 are opened, the first and second latches 14
a and 14b to the calculator 15 and the second
The output result of the sensor 8 is likewise the first and second reflectors 4,
When the third and fourth gates 13c and 13d corresponding to 5 are opened, they are sent to the calculator 15 via the third and fourth latches 14c and 14d.

First and third corresponding to the first reflector 4
The gates 13a and 13c are opened at a predetermined rotation angle of the impression cylinder 1 by a first counter 12a that counts pulse signals of the rotary encoder 11, and the second and fourth gates 13b and 13b corresponding to the second reflection plate 5 are provided. 13d is
Similarly, the rotary encoder 11 is opened at a predetermined rotation angle of the impression cylinder 1 by a second counter 12b which counts a pulse signal.

The calculator 15 outputs signals (data) sent from the first to fourth latches 14a to 14b.
Is represented as a binary number, which is further converted to a decimal number.
The control circuit 10 compares the result (response value) converted into the decimal number with, for example, a map as shown in Table 1 below to determine whether there is an abnormality.

[0024]

[Table 1]

With this configuration, for example, when there is no paper P, the first and second sensors 7 and 8 sense the second reflecting plate 5 first as the impression cylinder 1 rotates. At this time, the sensor outputs are both ON (in Table 1 above, ○). Impression cylinder 1
When further rotates, the sensor outputs both detect the first reflector 4 and turn on again.

On the other hand, when the paper P is present, the first and second sensors 7 and 8 first detect the second reflection plate 5 and turn on as the impression cylinder 1 rotates. Next, when the first reflection plate 4 comes, the second sensor 8 is turned on, but the first sensor 7 is blocked by the paper P and remains off (x in Table 1 above).

As described above, since the output of the first sensor 7 changes depending on the presence or absence of the paper P, it is possible to detect a paper drop.

By the way, if only the presence or absence of the paper P is determined, the first sensor 7 and the first reflector 4 are sufficient. However, in this case, when the first sensor 7 is soiled with powder or the like, “when there is no paper” is erroneously determined as “when there is paper”. In order to detect such a temporal change of the first sensor 7 and the first reflection plate 4, in the present embodiment, the second sensor 8 and the second reflection plate 5 are provided.

As a result, the sensor outputs in all cases are represented by a map as shown in Table 1 above. For example, in the case of “normal and paper present” in Table 1 above, the output is Becomes Here, the control circuit 10 (calculator 15) regards this output as “11”, “1”, “1”, “0” from the left as a binary number 1110, and converts this into a decimal number. The response value is 14.

Then, the control circuit 10 determines that there is no abnormality when the response value is 14 from the above Table 1, and stops the machine as there is an abnormality otherwise. Of course, it is also possible to display in more detail what is abnormal by the response value.

[Second Embodiment] FIG. 4 is a schematic configuration diagram showing a second embodiment of the present invention.

This is because the second reflector 5 in the first embodiment is used.
In this example, the reflector 4A corresponding to the first reflector 4 is formed wider. Other configurations are the same as those of the first embodiment, and the same members as those in FIG.

In the case of this embodiment, the ON time outputted by the first sensor 7 (not shown) (see FIG. 1) changes depending on the presence or absence of the paper P (for example, the ON time becomes shorter when there is paper).
This is used to detect the presence or absence of the paper P.

[Third Embodiment] FIG. 5 is an operation flow chart of a control circuit showing a third embodiment of the present invention.

This corresponds to the control circuit 10 in the first embodiment.
(See FIG. 2), from the printing start (mechanical rotation start) in step P1 to the paper arrival timing in step P2,
This is an example in which the contamination of the first sensor 7 is determined in Step P3, and the presence or absence of paper is determined in Step P7 from the arrival of the paper to the end of printing in Step P6. The timing at which the paper arrives is detected by an encoder provided in the machine by checking at what timing the paper is fed by the claw 2a (see FIG. 1) after the paper is fed.

That is, if the output of the first sensor 7 is OFF in Step P3, it is determined that "there is dirt". In Step P4, the machine is rotated at a low speed and stopped, and an alarm is issued or a lamp is displayed to perform cleaning. Encourage the implementation of On the contrary
If (consecutive two corresponding to the first and second reflectors 4 and 5), it is determined that there is no dirt, and high-speed operation is performed in step P5.

On the other hand, if the output of the first sensor 7 is ON in step P7, it is determined that "paper has dropped (no paper)", and in step P8, the machine is suddenly stopped, a lamp is displayed, and the paper is removed. Encourage implementation. On the other hand, if it is OFF, it is determined to be "normal" and high-speed operation is continued in step P9.

The present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the spirit of the present invention. Further, the present invention is not limited to a sheet-fed printing press with a reversing mechanism, but can be applied to all printing presses that need to detect the presence or absence of a sheet.

[0039]

As described above, according to the first aspect of the present invention, the sheet-like object sent to the transport cylinder is detected by the sheet-like object detection device, and the detection result is output by the sheet-like object detection device. In the sheet feeding abnormality detecting device for determining the feeding abnormality of the sheet-like material, the sheet-like material detecting device includes a light emitting device, a light emitting side deflection filter that transmits light from the light emitting device only in a first direction, and a light receiving device. A light-receiving-side deflection filter that transmits only light in a second direction different from the first direction that returns to the light-receiving device, and is deflected in the first direction by the light-projection-side deflection filter. Since the reflection member that reflects the reflected light with at least the light deflected in the second direction is disposed at a position of the transport cylinder that is covered by the sheet-like material, the reflection member is used when the type of the sheet-like material is changed or Even when dirty Feed abnormality can be determined accurately in sheet without being influenced on these.

According to the second aspect of the present invention, the sheet-like object sent to the transport cylinder is detected by the sheet-like object detection device, and the sheet-like object is fed by the detection output from the sheet-like object detection device. In a sheet feeding abnormality detecting device for determining abnormality, a first reflection member disposed at a position of the transport cylinder covered by the sheet-like member, and light reflected by a light projector and the first reflection member is received. A first sheet-like object detection device configured to detect the presence or absence of the sheet-like object, and a light-receiving unit configured to receive light reflected by the first reflecting member. Since the first sheet-like object detecting device is provided with the second sheet-like object detecting device for detecting dirt on the first reflecting member, the presence or absence of the sheet-like material is detected by the first sheet-like material detecting device, The first sheet at a certain point in the device If it is the same output result as the object detecting apparatus, it is determined that contamination is present on the first reflecting member, the abnormality of the abnormality detecting apparatus itself may determine.

According to the third aspect of the present invention, the second reflecting member is provided at a position where the second reflecting member is not covered with the sheet-like material, and the result of the detection output from the first sheet-like material detecting device is obtained. Based on the presence or absence of the sheet-like material based on,
The first and second sheet-like object detection devices or the first and second sheet-like object detection devices;
And a control means for determining dirt attached to at least one of the second reflection member, so that the presence or absence of a sheet-like object is detected by the first sheet-like object detection device, and the control means includes First and second sheet-like object detection devices
Based on the output result of the first and second reflection members.
Of the sheet-like object detection device or at least one of the first and second reflection members can be determined, and the abnormality of the abnormality detection device itself can also be determined.

[Brief description of the drawings]

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

FIG. 2 is an electric circuit diagram of the control means.

FIG. 3 is a schematic configuration diagram of the sensor.

FIG. 4 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 5 is an operation flowchart of a control circuit according to a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 impression cylinder 2 claw shaft 3 groove 4 first reflector 5 second reflector 6 claw bar 7 first sensor 8 second sensor 9A light emitter 9a light-emitter deflection filter 9B light-receiver 9b light-emission deflection filter 10 control circuit 11 Rotary encoders 12a, 12b First and second counters 13a to 13d First to fourth gates 14a to 14d First to fourth latches 15 Calculator P paper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C020 AA06 2C250 EA36 EB05 3F048 AA05 BA08 BA10 CC01 CC13 CC14

Claims (3)

[Claims] 1. A sheet feed abnormality detecting device which detects a sheet-like material sent to a transport cylinder by a sheet-like material detecting device, and determines a feeding abnormality of the sheet-like material based on a detection output from the sheet-like material detecting device. In the above, the sheet-like object detection device is a light emitting device, a light emitting side deflection filter that transmits light from the light emitting device only in a first direction, a light receiving device, and the first direction returning to the light receiving device A light-receiving-side deflection filter that transmits only light in a different second direction, and the light deflected in the first direction by the light-projection-side deflection filter is at least light deflected in the second direction. A sheet feeding abnormality detecting device, wherein a reflecting member for reflecting light is disposed at a position of the transport cylinder covered by the sheet-like material. 2. A sheet feeding abnormality detecting device which detects a sheet-like material sent to a transport cylinder by a sheet-like material detecting device, and determines a feeding abnormality of the sheet-like material based on a detection output from the sheet-like material detecting device. In Claim 1, the said sheet comprised of the 1st reflection member arrange | positioned in the position covered with the said sheet-like thing of the said conveyance drum, and the light receiver which receives the light reflected by the said 1st reflection member and the said 1st reflection member A first sheet-like object detection device for detecting the presence or absence of an object, a light emitter for receiving light reflected by the first reflection member, and a dirt on the first reflection member. A sheet feeding abnormality detection device comprising a second sheet-like object detection device. 3. A second reflection member is provided at a position of the transport cylinder that is not covered by a sheet-like material, and the presence or absence of the sheet-like material is determined based on a detection output result from the first sheet-like material detection device. 3. The sheet according to claim 2, further comprising control means for judging dirt attached to at least one of the first and second sheet-like object detecting devices or the first and second reflecting members. Feed abnormality detection device.