JPS59118657A - Paper feed device with unsatisfactory printed material rejection unit - Google Patents

Abstract

PURPOSE:To reject only an unsatisfactory printed material from a normal transport passage without stopping a paper feed device by activating a rejection unit with a detection signal when the unsatisfactory material is detected by a read- out unit. CONSTITUTION:When a photo-sensor 95 detects an unsatisfactory printed material L at the uppermost layer of a laminated material 1, an adsorption action is applied to a rejecting adsorption roller 8, and the rear end section of the unsatisfactory printed material L is adsorbed by an adsorption roller 8. Next, this roller 8 is rotated closkwise, and rejects the unsatisfactory printed material L from a normal transport passage and recovers it into a recovery section 9. At this time, normally operating adsorption rollers 11a, 11b are rotated while adsorb ing sheets of paper in front and rear of the unsatisfactory printed material L to prevent them from being disturbed.

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 work, for example, 100
Approximately 0 sheets of paper are stacked and cut at once, but each side of the paper must be aligned accurately for this purpose. In other words, even though the paper ejected by the printing machine, or the printed paper in its unwrapped state, is stacked with the printed patterns aligned vertically and horizontally, it can be cut all at once. It is not properly aligned.

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, so if you print on the back side, there is a risk of printing with misalignment between the front and back sides of the paper. There is. Therefore, a paper aligner is also required in such cases.

There are various types of paper alignment machines in practical use, but
In order to make full use of its function, when feeding paper in layers to the paper aligner, it is necessary to unravel the sheets while stacking them, that is, the stacked sheets 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 shifts the incompletely stacked paper discharged from the printing machine, or the stacked paper after unwrapping, one sheet at a time from the top. However, the sheets are transported in a partially overlapping state to a paper aligning machine, where they are sequentially stacked. In addition, in order to further improve the paper-separating effect of the paper feeding device, the paper that is transported in a partially overlapping state is reversed, and the underlying paper is placed in front of the overlapping paper. It is also effective to provide a reversing transfer section.

By the way, this kind of paper feeding device is very good for obtaining the paper-separating effect, but there is a method that utilizes the action of the paper feeding device, that is, the action of transporting printed paper one sheet at a time. , one with an added function of determining the printing state has been proposed. The printing condition can be determined by checking Y, M, C, B (yellow, magenta, cyan,
This is done by determining the color code (black) etc. using a photo sensor or color sensor, but since the paper feeding device transports the paper one sheet at a time, if this determination device is installed in a convenient location, the paper can be detected one by one. You will be able to make a judgment. As a secondary function, such a determination device can also detect that the wrapping paper containing the printed paper is transferred to the wrapping device. 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 automatically detects defective printed matter. The operation is stopped and removed manually.

Therefore, it is inefficient to have to stop the paper feeding device each time, and at the same time, it occurs irregularly. Therefore, it is necessary to allocate workers to remove defective prints and restart them after removal. It is inevitable and reasonable.

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 the above 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 when activated, only υ defective printed matter is removed. The structure is such that the transport material is removed from the normal transport path. Therefore, even if the reading device detects a defective printed matter, it can be removed without stopping the paper feeding device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 uppermost layer of paper in the stacked material 1 and sends it out to the right in the figure by rotation of this roller 2. The suction effect of the suction roller 2 is obtained by suctioning air through suction holes arranged at predetermined intervals along the outer periphery of the hollow roller via the hollow roller rotation shaft 21, and suctioning the paper to the suction holes. 3 is plywood and also has the function of pushing the laminate 1 upward. 4 is an upper belt with guide rollers 4a,
4b. A lower belt 5 is suspended over guide rollers 5a, 5b, 5c, and a reversing roller 6, which will be described later. Reference numeral 7 denotes a reversing belt, which is hung on a reversing roller 6 together with guide rollers 7a, 7b, 7c, and 7d and the lower belt 5. Reference numeral 8 denotes a suction roller for removing defective printed matter, which has the same structure and function as the suction roller 2 described above. Reference numeral 9 is a collecting section for rejected defective printed matter, and 10 is a paper aligning machine that receives fed sheets 1' in a stacked state and aligns them correctly.

The suction rollers lla and llb are constantly operating.
When the defective printed matter is pulled out by the removal suction row 28,
This is to absorb the paper in front and behind it to prevent it from getting dirty.

As is clear from FIG. 2, each belt has, for example, three magnolia rows, and suction rollers 2, 8. It is assumed that two lla and llb are arranged in parallel between the belts. Reference numeral 95 denotes a photosensor that monitors a specific portion of the pattern printed on the top layer of paper of the laminate 1 and determines whether or not the printing is appropriate.

The operation of the paper feeding device having such a basic structure is reversed 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 laminate 1
The top layer of paper is fed out by about 1/4 to 1/3 of the length of the paper, and is held between the upper belt 4 and the lower belt 5. After that, it is sent to the right in FIG. 1 by the transfer means constituted by these belts, but since the suction action and rotation of the suction roller 2 are continued,
From the stack 1, sheets of paper 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 is not given any suction action), and after being removed, the paper passes through the reversing belt 7 and the lower belt. 5 and is conveyed to reach the reversing roller 6. By passing through the reversing roller 6, the direction in which the paper is transported is changed, and at the same time, the leading paper is reversed from being on top, and the leading paper is placed below 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 starts from the time when the photosensor 95 detects a defective printed matter on the top layer of the laminate 1.
After the defective printed matter reaches the lower part of the suction roller 8, the defective printed matter is given out after a certain amount of time has elapsed. The suction roller 8 will remove 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 sheets of paper that are being transported are sent in the direction of the arrow Y in a partially overlapping state, but the rear end of the defective printed matter is 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 material 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 prints are collected in the collection section 9. The suction roller 11a is constantly operating when discharging the defective printed matter.

11b attracts and rotates the paper before and after the defective printed matter 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, the photosensor 95 as a reading means is attached to the margin of the printed matter on the top layer of the laminate 1.
At the same time as printing, the printed color information is read as a color code. This color code is usually printed with Y, M, C, and B (yellow, magenta, cyan, and black) simultaneously as rectangular marks, and the photosensor 95 corresponds to each on its light receiving surface. It is composed of four photoelectric sensors arranged with color filters, and monitors reflected light from external light or separately provided illumination light.

If all the stacked printed matter are proper printed matter, when the paper is continuously fed out by the feeding suction roller 2,
Pulses corresponding to the transport speed are obtained from each of the four photoelectric sensors, and two types of signals, pulse width and period, are input to the detection circuit 100. 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 concentrations of Y, M, C, and B, and there are irregularities in the four pulse widths obtained from the sensor 95.
Furthermore, if there is blank paper with no printing or residual wrapping paper, and the pulse cycle remains for a moment, the detection circuit 100 detects that a defective printed matter 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 180 is provided in the middle of a pipe extending from the vacuum pump 150 to the removal suction roller 8. Note that the rotation axis 8 of the suction roller 8
1 is hollow, and suction holes 82 are provided on the outer periphery of the roller, which is similar to the suction roller 2 for feeding.

In this way, the electromagnetic valve 130 is opened, and a suction action is applied to the removal suction roller 8. In addition, in order to obtain the adsorption effect the moment the solenoid valve 180 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 1 described above, it not only has the function of simply loosening the paper, but also detects defective printed matter during the transportation 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... Adsorption roller for removal 95... Photosensor L...Defective printed material 100...Detection circuit 120...Solenoid valve drive circuit 130...Solenoid valve 160...Pipe.

Claims (4)

[Claims] (1) A paper feeding means that sequentially takes out stacked papers with predetermined designs printed on them from the top and sequentially sends out the sheets above and below so that some of them overlap; a transport means for transporting the sheets of paper fed out in a partially overlapping state to a paper storage means; and a transport means located on the stacked papers or on the path of the transport means, and printing at a predetermined position of the paper. It is characterized by comprising a reading means for reading information, and a removing device disposed between the reading means and the paper storage means and removing the paper being transported from the transporting means in response to a signal from the reading means. A paper feeder equipped with a device for eliminating defective printed matter. (2) The defective printed matter removing device according to claim (1), further comprising a reversing transfer device for reversing the front and back sides of the paper being transferred between the removing device and the paper storage device. A paper feeder equipped with (3) The removing device is a suction roller that suctions the rear part of the paper being transferred and pulls out the paper in a direction opposite to the direction in which the paper is conveyed. A paper feeding device equipped with the defective printed matter removal device according to item (2). (4) The device for eliminating defective printed matter according to claim (1), wherein the reading device is a photo sensor that optically reads a detection mark printed on the margin of a predetermined printed pattern. A paper feeder equipped with