JPS6250388B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device that sequentially transports stacked papers in a partially overlapping state.

Generally, in the printing process, a plurality of pages are often printed on one sheet of paper, and therefore, post-processing involves cutting the paper into individual pages. In this cutting operation, for example, about 1,000 sheets of paper are stacked and cut at once, but each side of the paper must be precisely aligned for this purpose. In other words, even though the paper discharged by the printing machine or the printed paper in the unwrapped state is stacked with the printed patterns aligned vertically and horizontally,
They are not aligned correctly enough to be cut at once. For this reason, a so-called paper alignment machine is used to properly align the paper.

Such a paper alignment machine may be used not only for the pre-cutting process but also for double-sided printing. As mentioned above, the paper that is ejected from the printing machine after printing on one side is not aligned correctly.
If you continue printing on the back side, there is a risk that the paper will be printed with misalignment between the front and back sides. Therefore, a paper aligner is also required in such cases.

Various types of paper alignment machines have been put into practical use, but in order to make full use of their functions,
When feeding paper in a stacked manner to a paper aligning machine, it is necessary to stack the papers while loosening them, that is, the stacked papers must be released from their close contact with each other. A paper feeding device is effective as a device for this purpose, and this paper feeding device can handle incompletely stacked paper discharged from the printing machine,
Alternatively, after unwrapping, the stacked papers are shifted one by one from the top, and are transferred in a partially overlapping state to a paper aligner, where they are stacked one after another. In addition, in order to further improve the paper loosening effect as a paper feeding device, the paper that is transported in a partially overlapped state is reversed, and the paper below is inverted before the paper that is stacked on top of it. It is also effective to provide a transfer section.

By the way, such a paper feeding device is very excellent in obtaining a paper loosening effect, but it is possible to utilize the function of the paper feeding device, that is, to transport printed paper one sheet at a time, A printer with an additional printing state determination function has been proposed. The printing status can be determined by checking, for example, Y, M, C, B (yellow, magenta, cyan,
This is done by using a photo sensor and a color sensor to determine the color code of the black color, etc. However, since the paper feeding device transports the paper one sheet at a time, if this determination device is installed at an appropriate location, it will be possible to judge each sheet one by one. will be possible. As a secondary function, such a determination device can also detect that a wrapping paper containing printed paper has been transferred. In other words, when feeding paper to a paper feeder in order to streamline operations, a large number of sheets of paper are stacked in their wrapping paper on the stand of the paper feeder, and the wrapping paper is removed only from the sides.
The paper feed device may be operated as is. When such an operation is carried out, the top and bottom sides of the wrapping paper will be transferred in the same way as the printing paper, but the above-mentioned determination device will detect this transfer of the wrapping paper, so it can be sorted. It is.

However, this type of determination device in conventional paper feeding devices only detects defective printed matter and does not have a function to automatically eliminate it, so the paper feeding device stops operating as soon as it detects defective printed matter. This is removed by hand. Therefore, it is inefficient to have to stop the paper feeding device each time, and at the same time, it occurs irregularly, so it takes a lot of time for workers to remove defective prints and restart them after removal. The arrangement is unavoidable and unreasonable.

The present invention has been proposed in order to improve the above-mentioned prior art, and further develops a device for determining defective printed matter in a paper feeder so that defective printed paper can be automatically rejected. In order to achieve this object, the device of the present invention installs a rejecting device activated by a reading device that determines the printing condition in the path of the paper transport means in the paper feeding device, and by activation of the rejecting device, only defective printed matter is removed. The structure is such that the transport material is removed from the regular transport path. Therefore, even if the reading device detects a defective printed matter, it can be removed without stopping the paper feeding device.

An embodiment of the apparatus of the present invention will be described in detail below with reference to the drawings.

1 and 2 are a side view and a top view showing the basic structure of the apparatus of the present invention, and 1 is a laminate printed by a printing machine and simply laminated without being aligned. Reference numeral 2 denotes a suction roller which suctions the rear end of the top layer of paper in the stack 1 and sends it out to the right in the figure by rotation of this roller 2. The suction action by the suction roller 2 is caused by suction holes arranged at predetermined intervals along the outer periphery of the hollow roller to the hollow roller rotation shaft 2.
It is obtained by suctioning air through 1 and thereby adsorbing the paper. 3 is a base plate which also has the function of pushing up the laminate 1. 4 is an upper belt which is suspended between guide rollers 4a and 4b. Also 5
is the lower belt with guide rollers 5a, 5b, 5c,
And it is suspended by a reversing roller 6, which will be described later. 7
is a reversing belt, and guide rollers 7a, 7b,
7c, 7d, and are hung on a reversing roller 6 together with the lower belt 5. Reference numeral 8 denotes a suction roller for removing defective printed matter, which is similar to the suction roller 2 described above.
It has a similar structure and function. Reference numeral 9 represents a collection section for rejected defective printed matter, and reference numeral 10 represents a paper alignment machine that receives fed sheets 1' in a stacked state and aligns them correctly. Adsorption rollers 11a, 11b
are in operation all the time, and when a defective printed matter is pulled out by the removal suction roller 8, it attracts the paper in front and behind it so that it does not get spoiled.

As is clear from Fig. 2, each belt has, for example, 3
This is arranged in parallel, and the suction rollers 2, 8, 11a, 1
It is assumed that two pieces 1b are arranged in parallel between the belts. A photo sensor 95 monitors a specific portion of the pattern printed on the top layer of paper of the laminate 1 and determines whether the printing is appropriate or not.

The operation of the paper feeding device having such a basic configuration is performed as follows. First, when each roller is driven or partially driven by a motor or the like, it is rotated in the direction of the arrow in FIG. When an electromagnetic valve or the like is opened and a vacuum pump applies an adsorption action to the adsorption roller 2, the top layer of paper in the stack 1 is fed out by about 1/4 to 1/3 of the length of the paper, and this is transferred to the upper belt. 4 and the lower belt 5.
Thereafter, the conveying means composed of these belts transports the material to the right in FIG. The sheets are sequentially fed in a partially overlapping state. This situation is shown in FIG. 3, for example. Then, the paper being transferred passes under the removal suction roller 8 (in this case, it is assumed that the removal suction roller 8 has no suction effect), and then the reversing belt and the lower belt 5 The paper is sandwiched between the two and transported, and reaches the reversing roller 6. By passing through the reversing roller 6, the conveying direction of the conveyed paper is changed, and at the same time, the leading paper is reversed from the top, and the leading paper is placed under the following paper. The sheets are then sequentially discharged and stacked in the sheet aligning machine 10. Note that when the reversing roller 6 is used in this manner, the effect of loosening the paper is enhanced and at the same time, the paper is obtained in a reversed state, so it is convenient to use it when performing double-sided printing.

The suction action of the removal suction roller 8 is applied after a period of time has elapsed from the time when the photo sensor 95 detects a defective print on the top layer of the laminate 1 until the defective print reaches the lower part of the suction roller 8. The suction roller 8 removes only the defective printed matter from the normal transport path, and its action will be described with reference to FIG.

FIG. 3 shows only the main parts including the removal suction roller 8, and the same reference numerals are given to the members that have been explained so far. As shown in the figure, the paper K being transported is sent in the direction of the arrow Y in a partially overlapping state, but the rear end of the defective printed matter L has been transported under the removal suction roller 8. When a suction action is instantaneously applied to the suction roller 8, the rear end of the defective printed matter L is suctioned by the suction roller 8.
Since the suction roller 8 is rotated clockwise, the paper K is pulled up from the rear end in a direction opposite to the paper K that is being fed in the normal transport direction. When the adsorption action is released at an appropriate timing, the defective printed matter L will be collected by the collecting section 9. This defective print L
The suction roller 11 that is constantly operating when discharging
a and 11b attract and rotate the papers on the front and back of the defective printed matter L to prevent them from getting dirty.

FIG. 4 is a schematic diagram illustrating the relationship between the reading means for determining defective printed matter and the above-mentioned removal suction roller 8. For example, as shown in the figure, a photo sensor 95 serving as a reading means reads the printed color information as a color code on the margin of the printed matter on the top layer of the laminate 1 at the same time as printing. This color code is usually printed simultaneously with Y, M, C, B (yellow, magenta, cyan, black) as a rectangular mark, and is printed on the photo sensor 95.
The sensor is composed of four photoelectric sensors each having a corresponding color filter arranged on its light-receiving surface, and monitors external light or reflected light from separately provided illumination light.

If all the printed matter in the stack is proper printed matter,
When the paper is continuously fed out by the feeding suction roller 2, pulses corresponding to the feeding speed are obtained from each of the four photoelectric sensors, and two types of signals, the pulse width and the period, are sent to the detection circuit 100. It will be entered. If the two types of signals mentioned above are appropriate, no suction action is applied to the removal suction roller 8, and the printed matter is sent along the regular transport path.

However, there are variations in the density of Y, M, C, and B, and there are irregularities in the four pulse widths obtained from the sensor 95, and there is also blank paper with no printing or leftover wrapping paper. When the pulse cycle lapses momentarily, the detection circuit 100 detects that a defective printed material has been transferred. When this abnormality detection signal is generated, the signal output is input to the electromagnetic valve drive circuit 120. Solenoid valve drive circuit 1
Reference numeral 20 includes a delay circuit, which delays the operation of the electromagnetic valve drive circuit by the time until the defective printed matter is transferred under the removal suction roller 8 after the abnormality detection signal is generated. Thereafter, the output signal of the solenoid valve drive circuit 120 will open the solenoid valve 130. This solenoid valve 130 is provided in the middle of a pipe extending from the vacuum pump 150 to the removal suction roller 8. Note that the suction roller 8 has its rotating shaft 81.
It is hollow with 8 suction holes on the outer periphery of the roller.
2 is provided, which is similar to the suction roller 2 for feeding.

By opening the electromagnetic valve 130 in this manner, a suction action is applied to the removal suction roller 8. In addition, in order to obtain an adsorption effect the moment the solenoid valve 130 is opened, a vacuum chamber with a relatively large volume is added between the vacuum pump 150 and the solenoid valve 130, and the vacuum pump is constantly operated. It is advantageous to keep it under vacuum.

According to the paper feeding device of the present invention having the configuration and operation described above, it not only has the function of simply loosening paper, but also detects defective printed matter during the transport process and stops the operation of the paper feeding device. Since this is automatically eliminated without any problems, the workability is much more streamlined compared to conventional methods.

Note that it is of course possible to change the means for determining defective printed matter in the paper feeder of the present invention to one for black and white printed matter.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the basic configuration of the device of the present invention. FIG. 2 is a top view with respect to FIG. FIG. 3 is a side view of the main part including the suction roller for removal used in the apparatus of the present invention. FIG. 4 is a schematic diagram illustrating the suction action of the removal suction roller used in the apparatus of the present invention. 1...Laminated material, 2...Adsorption roller for feeding,
4... Upper belt, 5... Lower belt, 6... Reversing roller, 7... Reversing belt, 8... Removal suction roller, 95... Photo sensor, L... Defective printed matter, 100... Detection circuit, 120 ... Solenoid valve drive circuit, 130 ... Solenoid valve, 160 ... Pipe.

Claims (1)

[Scope of Claims] 1. Paper that has a predetermined pattern and a mark indicating that it has been printed printed at a certain position and is stacked and taken out in order from the top, and sequentially sends out vertically adjacent papers so that some of them overlap. a feeding means, a transporting means for transporting the partially overlapping paper sent out by the paper feeding means to a paper storage means, and a top of the stacked papers or a path of the transporting means. a reading means for optically reading the mark indicating the printed mark printed at a certain position; and when the reading means identifies paper on which the mark is incorrectly printed, the paper While the paper is being transferred to the paper storage means by the transfer means, the rear end of the paper is sucked and the paper is curved from the rear end side while being pulled out in the opposite direction to the paper feeding direction of the transfer means and removed. A paper feeding device equipped with a defective print removal device, characterized in that the paper feed device comprises a removal device. 2. Claims characterized in that the removal device is a suction roller provided with suction holes on the outer periphery and rotated so as to pull out the paper suctioned by the suction holes in a direction opposite to the transfer means. 1st
A paper feeding device equipped with a device for removing defective printed matter as described in Section 1.