JP2580457Y2 - Broken sheet detector of sheet-fed printing press - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a paper feeder for a sheet-fed printing press. The present invention relates to a sheet-fed printing press that continuously feeds paper without stopping, and more particularly, to a damaged sheet detection device that detects a damaged sheet generated when switching to a spare sheet.

[0002]

2. Description of the Related Art An apparatus of this type is disclosed in Japanese Patent Application Laid-Open No. 1-321223 proposed by the same applicant. The document disclosed in this publication includes a paper stacking plate on which paper is loaded and supported so as to be able to move up and down, and a spare paper stacking plate for loading spare paper during paper feeding, and a paper loading surface of the paper stacking plate. In addition to providing a groove in the groove, a fork to insert and remove this groove is provided,
After inserting the fork into the groove of the stacking board at the raised position of the stacking board, lower the stacking board to support the paper on the upper surface of the fork, and raise the spare stacking board to raise After the upper surface of the fork is brought into contact with the lower surface of the fork, the fork is pulled out and the paper is placed on the spare paper, thereby continuously feeding the paper without stopping the machine. It is.

In this type of paper feeder, the fork insertion / extraction operation performed during the switching operation of the paper stacking board and the spare paper stacking up / down operation is performed. Fork marks are left on the lower paper and the uppermost paper of the spare stacking board, and this is wasted paper. Therefore, it is necessary to remove the waste sheet, and conventionally, the timing at the time of inserting and removing the fork is measured and removed from the sheet discharge section.

[0004]

However, as described above, the conventional method of removing waste paper is a work in which the timing of removing and inserting a fork is measured. If it is impossible to remove the waste paper, the trouble in the next process has been caused. Further, in order to remove the waste paper in a timely manner, one operator confirms that the spare paper has been fed, notifies the other operator in the paper discharge unit of the paper, and discharges the waste paper. Since two operators are required to take out at an appropriate timing, there is a problem in that labor is saved, and the removal operation itself requires skill.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems or disadvantages, and a purpose thereof is to surely find a damaged paper and eliminate forgetting to remove the damaged paper. In addition, another object of the present invention is to provide a damaged sheet detection device for a sheet-fed printing press, which facilitates a damaged sheet removing operation.

[0006]

In order to achieve this object, a waste sheet detecting device for a sheet-fed printing press according to the present invention has a groove provided on a loading surface on which paper is loaded and is supported so as to be able to move up and down. A paper stack, a fork inserted into and removed from the groove of the paper stack, and a spare paper stack for loading extra paper during paper feeding are provided, and the groove of the paper stack at the raised position of the paper stack. After inserting the fork into the fork, the paper stack is lowered to support the paper on the upper surface of the fork, and the spare paper stack is raised to bring the upper surface of the spare paper into contact with the lower surface of the fork. A sheet-fed printing press provided with a paper feeder for removing the fork and placing the paper on the spare paper after the fork is removed. Paper, a detector for detecting the detected paper and transmitting a detection signal, and operating by the detection signal of the detector. Providing an actuation means. Further, the waste sheet detecting device of the sheet-fed printing press according to the present invention is provided with an alarm unit for issuing an alarm based on a detection signal of the detector. In addition, the waste sheet detecting device of the sheet-fed printing press according to the present invention is provided with a slip sheet inserting device which is activated by a detection signal of the detector and inserts a slip sheet between the sheets. In addition, the waste sheet detection device of the sheet-fed printing press according to the present invention includes a plurality of paper ejection units that eject the fed and printed paper, and converts a predetermined paper into a normal paper according to a detection signal of the detector. And a switching unit for discharging the sheet to another sheet discharging unit.

[0007]

According to the present invention, when the detected paper is fed, it is detected by the detector, and the operator is notified by the alarm means. Remove broke. In addition, since the slip sheet is inserted into the waste sheet by the slip sheet insertion device, the position of the damaged sheet is displayed by the slip sheet. Further, normal paper and waste paper are separately discharged by a switching means operated by a detection signal of the detector.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall external view of a sheet-fed printing press equipped with the waste sheet detection device according to the present invention, FIG. 2 is an enlarged rear view showing the relationship between a sheet stack and a fork in the sheet-fed printing press, and FIG. FIG. 4 is an external perspective view of the horizontal needle device in the sheet-fed printing press, FIG. 4 is a front view of the horizontal needle device, and FIG. 5 is a block diagram of a detection circuit of the waste sheet detection device. In these figures, a sheet-fed printing press generally denoted by reference numeral 1 includes a sheet feeding unit 2 and a printing unit 3.
And a paper discharge unit 4. A paper stacking plate 11 on which paper 10 to be fed is loaded is disposed in the paper feeding unit 2, and the paper stacking plate 11 is mounted on a paper stacking table 12 suspended by a lifting chain (not shown). , Paper 10 is the printing unit 3
As the paper 10 on the paper stacking plate 11 is reduced by the paper feeding, the paper stacking table 12 automatically rises, and the upper end surface of the stacking paper is held at a constant height.

The paper feed section 2 is provided with an automatic paper stacker reloading device, which will be described. On the upper end surface of the paper stacking plate 11, a plurality of grooves 11a concavely formed in a comb shape are formed. A guide rail 14 is horizontally installed at the center of the frame indicated by reference numeral 13, and a fork base 15 is movable on the guide rail 14 in the left and right directions in the figure using a motor (not shown) as a drive source. ing. This fork base 15 has a plurality of forks 1 having the same pitch as the groove 11a.
6 are protrudingly provided. Reference numeral 17 denotes extra paper placed on an extra paper stack 18 outside the frame 13 and is movable by a trolley 19.

In such a configuration, when the paper stack 16 is raised to a certain height in accordance with the feeding of the paper 10, the spare paper 17 is positioned by the trolley 19 so that the spare paper 17 is positioned below the paper 10. 18 is moved. Next, the fork 16 is moved to the left in FIG. 1 to insert the fork 16 into the groove 11a of the stacking board 11, and then the stacking board 11 is lowered to support the paper 10 on the upper surface of the fork 16. After raising the spare paper stacking plate 18 to bring the upper surface of the spare paper 17 into contact with the lower surface of the fork 16, the fork 16 is pulled out, and the paper 10 is placed on the spare paper 17. The paper is continuously fed without stopping the machine. Here, on the top of the spare paper 17, a color paper 20 which is a detection paper of a different color from the paper 17 is placed.

The paper 10 is sucked one by one from a top paper by a soccer device (not shown) and sent to the difference plate 22 where the registration in the top and bottom directions is aligned.
3 and is sent to the printing unit 3 with the top and bottom in the width direction aligned. The printing unit 3 includes four printing units 25a to 25d in order to print four colors on the paper 10.
Is provided. The paper which has been printed by the printing unit 25d is held by a paper ejection claw member (not shown) supported at regular intervals on a paper ejection chain 27 stretched between the sprockets 26, and is fed to the cam of the paper release mechanism 28. The paper 10 held by the engagement of the paper ejection claw member is released, and the paper 10 is dropped and loaded on the pile 29. Reference numeral 30 denotes a conventionally known slip sheet inserting machine which inserts a slip sheet such as a tape between the stacked sheets of paper 10, and is operated by a control signal described later. Reference numeral 31 denotes a buzzer which is an alarm means that sounds in response to the control signal described above. Reference numeral 32 denotes a counter which counts the number of printing operations of the printer 1 and is one of the printing units 25, in this embodiment, the printing unit 25d. The printing operation is counted.

Next, a broken sheet detecting device which is a feature of the present invention mounted on the horizontal needle device 24 will be described with reference to FIGS. Reference numeral 35 denotes an upper plate of a paper receiving table. A roller arm 36 is attached to the upper plate 35 by a bolt 37 so as to be swingable about the bolt 37. A pressing plate 39 facing the roller 38 and the upper plate 35 is provided. Reference numeral 40 denotes a gauge for aligning the register by bringing the side edges of the paper into contact with each other.
1 is provided with a horizontal needle detector 42 for detecting whether the register of the paper is accurately aligned with the gauge 40. A paper guide 43 is attached to a crank-shaped arm 44 implanted in the gauge 40.

Reference numeral 46 denotes a photoelectric detector for detecting colored paper as a detector which is a feature of the present invention. The photoelectric detector 46 is attached to the other end of the arm 45 having one end attached to the gauge 40 and close to the upper plate 35. . The photoelectric detector 46 detects reflected light in the case of ordinary paper, that is, white paper, and does not detect reflected light in the case of the colored paper 20 because reflected light cannot be obtained. . In the present embodiment, the photoelectric detectors 46 are disposed in the left and right horizontal needle devices, respectively, and are provided in a pair. The upper plate 35 includes the photoelectric detector 4
A counterbore-shaped recess 35a is provided corresponding to 6 and
The bottom surface is coated with anti-reflection paint.

A block 50 is a circuit for detecting a damaged sheet.
Is an AND circuit when no reflected light is detected by the left and right photoelectric detectors 46, and 52 is the AND circuit 51 and the timing T ₁ , that is, an empty timing at the start of sheet feeding and one sheet of the sheet 10 to be fed. The AND circuit 53 for the detection timing of one sheet and the condition input to the AND circuit 52, that is, the condition that printing is being performed when the paper feeder is ON and the impression cylinder is pressed against the blanket cylinder. AND circuit. When these AND circuits 51, 52 and 53 are cleared, output signals are sent to the shift register circuit 54 and the buzzer 32, and the buzzer 32 sounds. On the other hand, in the shift register circuit 54 to which the output signal has been sent, after a predetermined time, that is, after the colored paper 20 is detected by the photoelectric detector 46, the printing is performed by the printing unit 2, and the paper is discharged onto the pile 29 by the paper discharging unit 4. A control signal is transmitted to the slip sheet inserter 30 after the elapse of the time.

Next, a description will be given of an operation for detecting a damaged sheet of a sheet-fed paper printing press having such a configuration. When the printing operation is started and the paper 10 is fed, and the paper stacking plate 11 reaches a certain height, the above-described automatic paper stacker reloading device places the spare paper 17 below the paper 10. The paper 10 is loaded. At this time, the trace of the fork 16 remains on the lowermost paper of the paper 10 and the uppermost paper of the spare paper 17, that is, the colored paper 20 due to the insertion and removal of the fork 16, and becomes a waste paper. Then, the printing is continued, and the feeding of the paper 10 is completed.
Is started, the top colored paper 20 is placed in the register 23.
To the horizontal needle device 24. When the conveyed colored paper 20 is positioned at one of the left and right photoelectric detectors 46, no reflected light is detected by both photoelectric detectors 46, an output signal is sent from the AND circuit 53 to the buzzer 32, and the buzzer sounds. .

At the same time, in the shift register circuit 54 to which the output signal has been sent, a control signal is sent to the slip sheet inserting machine 30 immediately before the colored paper 20 is discharged onto the pile 29, and the tape not shown in the drawing is used. The mark of the fork 16 is inserted between the colored paper 20 which becomes the waste paper and the paper 10 immediately before. Therefore, the operator is notified of the occurrence of the waste paper by the sound of the buzzer 32, and can recognize the location of the waste paper by inserting the tape, so that the waste paper can be easily removed in a short time. Unlike the prior art, there is no need to position another operator in the paper feeding unit to confirm that the spare paper has been fed, and it is not necessary to measure the timing for removing the damaged paper. Does not require skill. In this embodiment, the position of the damaged sheet is recognized by the tape inserted by the slip sheet insertion machine 30. However, the sounding of the buzzer 32 causes the operator located at the sheet discharging section 4 to recognize the damaged sheet. It is also possible to extract the damaged paper using the colored paper 20 discharged as a mark, and in this case, the slip sheet inserting machine 30 becomes unnecessary. In this case, the operator can signal the sound of the buzzer 32 and check the number of printed sheets with the counter 31 to reliably remove the damaged sheet at an appropriate timing.

FIG. 6 is a schematic side view of a paper discharge unit according to a second embodiment of the present invention. In the second embodiment, in addition to the pile 29 described above, another second pile 60 is arranged in the paper discharge section 4 along the paper discharge direction. Reference numeral 61 denotes a paper release mechanism which is a switching means. The paper release mechanism 61 is provided with a cam (not shown) with which a paper discharge claw member supported on the paper discharge chain 28 engages. Normally, the shift register circuit 5
In response to the control signal from 4, the paper advances to the paper discharge chain 28 side, engages with the paper discharge claw member, and drops the paper held by the paper discharge claw member onto the second pile 60. At this time, the control signal is transmitted for a period of time required to drop and stack one sheet of paper on the second pile 60.
To the side.

Therefore, when the supply of the paper 10 is completed and the colored paper 20 is supplied, and the colored paper 20 is positioned at one of the left and right photoelectric detectors 46, the reflected light is not detected by both photoelectric detectors 46. An output signal is sent from the AND circuit 53 to the shift register circuit 54. In the shift register circuit 54, when the colored paper 20 is positioned on the pile 60 by the paper discharge claw member of the paper discharge chain 28, a control signal is sent to the paper release mechanism 61 to cause the cam to advance to the paper discharge chain 28 side. The colored paper 20 is dropped and loaded on the second pile 60 by the advanced cam. As described above, in the second embodiment, since the colored paper 20, which is the waste paper, is automatically separated, an operator for removing the waste paper is not required, and labor saving can be achieved.
It is possible to more reliably remove waste paper.

In the present embodiment, the photoelectric detector 46 as a detector is provided on each of the left and right horizontal needle devices 24 of the register 23, but it is needless to say that the photoelectric detector 46 may be provided on either one. The detector may be provided in the paper transport path, and it goes without saying that the detector is provided other than the horizontal needle device 24. Further, the colored paper 20 does not necessarily have to be entirely colored, as long as the portion detected by the detector is colored. In the present embodiment, only the colored paper 20 is removed.
If the paper immediately before 0, that is, the lowest paper of the paper 10 is also a waste paper, it goes without saying that the lowest paper can be removed.

[0020]

As described above, according to the present invention, the paper to be detected loaded on the upper surface of the spare paper, the detector for detecting the paper to be detected and transmitting the detection signal, and the detector An alarm means that issues an alarm based on the detection signal is provided, so that the operator does not forget to remove the waste paper and eliminates the need for an operator of the paper feed unit, which was conventionally required to confirm that the waste paper was fed. Therefore, labor saving can be achieved. Further, since the detected paper, which can be distinguished from the paper to be printed, becomes the waste paper, it is possible to reliably find and remove the waste paper.

Further, a paper to be detected loaded on the top surface of the spare paper, a detector for detecting the paper to be detected and sending out a detection signal, and operating between the paper and the paper by the detection signal of the detector. And a slip-sheet insertion device that inserts slip-sheets into the paper, so that the slip-sheet is inserted into the waste-sheet part. Can be easily identified, and the waste paper can be reliably removed before the next process is performed.

A plurality of paper discharge units for discharging the fed and printed paper are provided, and a paper to be detected stacked on the upper surface of the spare paper and the detected paper are detected and a detection signal is transmitted. A detector and switching means for discharging a predetermined sheet to a different discharge unit from the normal paper in accordance with a detection signal of the detector, and automatically discharging the damaged sheet to another discharge unit As a result, the waste paper is reliably removed without manual intervention.

[Brief description of the drawings]

FIG. 1 is an overall external view of a sheet-fed printing press according to the present invention.

FIG. 2 is an enlarged rear view showing the relationship between the stacking platform and the fork in the sheet-fed printing press according to the present invention.

FIG. 3 is an external perspective view of a horizontal needle device in the sheet-fed printing press according to the present invention.

FIG. 4 is a front view of the horizontal needle device in the sheet-fed printing press according to the present invention.

FIG. 5 is a block diagram of a detection circuit of the damaged sheet detection device in the sheet-fed printing press according to the present invention.

FIG. 6 is a schematic side view of a sheet discharge unit in a second example of the sheet-fed printing press according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 sheet-fed printing press 2 paper feed unit 3 printing unit 4 paper discharge unit 10 paper 17 spare paper 20 colored paper 24 horizontal needle device 30 slip-sheet insertion device 31 buzzer 46 photoelectric detector 60 second pile 61 paper release mechanism

Claims (4)

(57) [Scope of request for utility model registration] 1. A paper stacking plate provided with a groove on a loading surface on which paper is stacked and supported so as to be able to move up and down, a fork inserted into and pulled out from the groove of the paper stacking plate, and a spare paper being loaded during paper feeding. A spare stacking board is provided, and after inserting the fork into the groove of the stacking board at the raised position of the stacking board, lowering the stacking board to support the paper on the upper surface of the fork, A paper feeder for raising the spare paper stacking plate to bring the upper surface of the spare paper into contact with the lower surface of the fork, then pulling out the fork and placing the paper on the spare paper. In the sheet-fed printing press provided, a detected paper stacked on the top of the spare paper, a detector that detects the detected paper and sends out a detection signal, and an operation that is activated by the detection signal of the detector Means for detecting a waste sheet of a sheet-fed printing press. 2. A paper stacking plate which is provided with a groove on a stacking surface on which paper is stacked and which is supported so as to be able to move up and down, a fork inserted into and extracted from the groove of the stacking plate, and a spare paper stacking during paper feeding. A spare stacking board is provided, and after inserting the fork into the groove of the stacking board at the raised position of the stacking board, lowering the stacking board to support the paper on the upper surface of the fork, A paper feeder for raising the spare paper stacking plate to bring the upper surface of the spare paper into contact with the lower surface of the fork, then pulling out the fork and placing the paper on the spare paper. In the sheet-fed printing press provided with the detection target paper stacked on the upper surface of the spare paper, a detector that detects the detection target paper and sends a detection signal, and an alarm that issues an alarm based on the detection signal of the detector Means for detecting a waste sheet of a sheet-fed printing press. 3. A paper stacking plate provided with a groove on a loading surface on which paper is loaded and supported so as to be able to move up and down, a fork inserted into and extracted from the groove of the paper stacking plate, and a spare paper being loaded during paper feeding. A spare stacking board to be provided is provided, after inserting the fork into the groove of the stacking board at the raised position of the stacking board, lowering the stacking board to support the paper on the upper surface of the fork, A paper feeder for raising the spare paper stacking plate, bringing the upper surface of the spare paper into contact with the lower surface of the fork, and then removing the fork and placing the paper on the spare paper. In the sheet-fed printing press provided, a detection target paper stacked on the upper surface of the spare paper, a detector for detecting the detection target paper and transmitting a detection signal, and a paper activated by the detection signal of the detector and And a slip sheet insertion device for inserting a slip sheet between the sheet and the paper. Output device. 4. A paper stacking plate provided with a groove on a loading surface on which paper is stacked and supported so as to be able to move up and down, a fork inserted into and extracted from the groove of the paper stacking plate, and a spare paper being loaded during paper feeding. A spare stacking board is provided, and after inserting the fork into the groove of the stacking board at the raised position of the stacking board, lowering the stacking board to support the paper on the upper surface of the fork, A paper feeder for raising the spare paper stacking plate to bring the upper surface of the spare paper into contact with the lower surface of the fork, then pulling out the fork and placing the paper on the spare paper. A sheet-fed printing press provided with a plurality of paper discharge units for discharging paper that has been fed and printed, a detection target paper stacked on the top surface of the spare paper, and a detection signal And a predetermined sheet is discharged to a discharge section different from the normal paper according to a detection signal of the detector. And a switching means provided with the switching means.