JPH06183638A - Printed paper rejecting device - Google Patents

Abstract

PURPOSE:To prevent irregularity of a bundle of printed paper after accumulation by detecting the irregularity of a train of printed paper conveyed in an overlapped state onto a belt conveyer from a rotary press, and rejecting an irregular part of the train of printed paper by a rejecter means according to the detected results. CONSTITUTION:Printed paper (s) which is discharged from a rotary press is conveyed as a train of printed paper in an overlapped state by a belt conveyer 1. A TV camera 2 which monitors the chain of printed paper from the above through the whole width is installed and its image signal is inputted into an image processing device 4. Namely, the chain of printed paper which passes through a dark room formed on the way of the conveyer 1 is illuminated by an illuminating device 3 from its upper rear side, and a shadow which is generated at a boundary line of respective printed paper (s) by the TV camera 2 is taken out as light and darkness. The detected pitch (shade interval) is compared with a standard one, and if there is any pitch shifting, a signal from a rotary encoder 9 is counted up and a rejecting means 7 is operated by a signal from a control part 8 to reject the disturbed part in the train of printed paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print rejecting device arranged in a conveying path between a rotary printing press and a print stacking section.

[0002]

2. Description of the Related Art Generally, prints conveyed from a rotary printing press on a belt conveyor by a row of sashimi-like prints are bundled in an accumulating section so as to be convenient for transportation and handling in a subsequent process. In this case, the printed sheets being conveyed are often disturbed due to curves or steps on the belt conveyor.
Conventionally, as a countermeasure against this, joggers are provided everywhere on the conveyance path to correct the disturbed rows.

[0003]

However, it is difficult for the jogger straightening to sufficiently recover the disordered alignment of the printing plate rows, and as a result, the bundled printing books may be misaligned or the stacking device may cause the paper stacking error. There were problems such as clogging, which was an obstacle to production.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent troubles such as misalignment of a bundle of printed sheets after stacking and paper jamming in the stacking device. Therefore, it is an object of the present invention to provide a print rejecting apparatus that eliminates a disturbed portion of the print row from the transport path.

[0005]

In order to achieve the above-mentioned object, a printing plate rejecting device of the present invention is a detection means for detecting a disturbance of a printing plate row conveyed in a sashimi form on a belt conveyor from a rotary printing press. And a rejecting means that operates so as to eliminate a disturbed portion of the print line according to a signal from the detecting means.

[0006]

With the above-described structure of the rejecting apparatus for the book copy,
The detection means detects the disturbance of the printing line on the belt conveyor,
Based on the detection result, the rejecting means acts to eliminate the disturbed portion of the print line.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an outline of a booklet rejecting apparatus as an embodiment of the present invention.

In FIG. 1, 1 is a horizontal belt conveyor that conveys the prints s discharged from a rotary printing machine as a sashimi-like print line, and 2 is a television that monitors the print line from the upper side to the full width. A camera 3, a lighting device arranged on the rear side of the TV camera 2 when viewed in the traveling direction of the copy book row, and an image processing device 4 connected to the TV camera 2, at least the TV camera 2 and the lighting device 3 are provided. It is arranged in a dark room (not shown) provided in the middle of the belt conveyor 1. 5 is a drum around which a belt 6 that rotates in the vertical direction is wound,
The belt 6 is adapted to change the direction of the book row upward. Further, 7 is a well-known rejecting means for ejecting the upwardly conveyed copybook s from the conveyance path, which is a control section 8
It operates by the signal from. Reference numeral 9 denotes a rotary encoder provided on the shaft of the drum 5, which is a copy sheet s passing through the drum 5.
Is counted and the signal is sent to the control unit 8.

Inside the image processing apparatus 4, the printing pitch in the printing row is monitored by the method shown in FIG. In other words, the illuminating device 3 illuminates the row of prints passing through the dark room provided in the middle of the belt conveyor 1 from the rear obliquely above, and the television camera 2 takes out the shade formed at the boundary of each of the prints s as light and dark. At this time, a plurality of scanning lines are set on the screen (for example, AA, BB, CC, D-
D), and by appropriately selecting the light and dark thresholds,
I try to avoid the influence of the design on the copybook s. Then, the detected pitch (shadow interval) is compared with a standard value in the image processing apparatus 4, and if there is a pitch deviation, the signal from the rotary encoder 9 is counted and the control unit 8
The rejecting means 7 is operated by the signal from to discharge the disturbed portion of the printing book row. By comparing the pitches of the front and rear printing sheets s, it is also possible to eject only the portion having a sudden pitch deviation.

Further, inside the image processing apparatus 4, the lateral deviation and the inclination of the printing book s are monitored by the method shown in FIG. That is, as shown in the figure, the light table 10 is arranged on the opposite side of the television camera 2 with respect to the row of the books passing through the dark room, and the position and width of the silhouette of the book s to be photographed are indicated by the scanning line E-E. taking measurement. Then, the measured silhouette width is compared with the standard value of the width of the copy s in the image processing apparatus 4, and if there is a lateral displacement or inclination, the signal from the rotary encoder 9 is counted and the signal from the control unit 8 is counted. Then, the rejecting means 7 is operated to discharge the disturbed portion of the printing book row. Even in this case, by comparing the positions and widths of the front and rear rows, it is possible to discharge only a portion having a sudden lateral deviation and an inclination.

Further, the printing plate rejecting apparatus of the present invention is provided with a plurality of rollers 11 for detecting the thickness of the printing line as shown in FIG. 4 on the belt conveyor 1 of FIG. It is also possible to detect bending of s and abnormal overlap. In this case, the height of the roller 11 is detected, and when the detected value becomes larger than the standard height, the signal from the rotary encoder 9 is counted and the reject means 7 is operated by the signal from the controller 8 to print. Try to eject the disturbed part of the main line. The detecting means composed of the row of rollers 11 may be used alone, but it is effective to use the detecting means together with the detecting means.

[0013]

As described above, according to the print-sheet rejecting apparatus of the present invention, the print-printing rows discharged from the rotary printing machine on the belt conveyor in the form of sashimi are monitored and their alignment is disturbed. By eliminating these, it is possible to accurately convey the sashimi-like row of sashimi to the stacking unit, which may cause troubles such as uneven stacking of swatches after stacking and paper jams in the stacking device. Absent.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a copybook rejecting device as one embodiment of the present invention.

FIG. 2 is an explanatory diagram of the principle of a detection unit that detects a disorder of a copy book row.

FIG. 3 is a principle explanatory diagram of a detection unit that detects a disorder of the copy book row.

FIG. 4 is a side view showing another detection means for detecting the disturbance of the copy book row.

[Explanation of symbols]

 1 Belt Conveyor 2 Television Camera 3 Lighting Device 4 Image Processing Device 7 Rejection Means 8 Control Unit 9 Rotary Encoder 10 Light Table 11 Roll

Claims (1)

[Claims] 1. A detection means for detecting a disturbance of a printing book row conveyed in a sashimi form on a belt conveyor from a rotary printing machine, and an operation for eliminating a disturbed portion of the printing book row by a signal from the detection means. And a reject means for performing the reject function.