JP2723733B2 - Continuous paper transport device for printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous paper transport device for an output printing machine such as an information processing device.

[0002]

2. Description of the Related Art As an output printer for an information processing apparatus, a printer using continuous paper is often used.

[0003] The continuous paper is a so-called fanfold paper in which perforations are provided at fixed lengths and alternately folded at each perforation. Generally, 100
It is folded in units of about 0 to 2000 pages and stored in a box.

Further, in continuous paper, when the first page of the leading end is stretched and placed horizontally, the perforated portion alternates between a convex portion and a concave portion. Is called a valley perforation.

In general, various mechanisms have been employed in a paper transport mechanism of a printing apparatus using continuous paper in order to correctly stack printed continuous paper on a stacker. In particular, if the first page is not set correctly in the stacker at the time of sheet setting and the ridges and valleys are reversed without being set correctly as perforations, sheets sent later will cause a stacker jam.

For this reason, when the paper is stretched when the paper is set in the paper transport unit, the folding perforation of the first page when viewed horizontally with respect to the traveling direction of the paper is determined to be a peak or a valley. This is because the leading edge of the continuous paper is hanged from above, but the trajectory of the paper is different between the case where the fold perforation of the first page is a valley and the case where the fold is a mountain.

For this reason, the mechanism and structure of the stacker section are designed to match the locus of the sheet at that time by determining the folding perforation of the first page to be a peak or a valley.
As a result, when the continuous paper after print output is dropped into the stacker from above, the folding perforation will be in the same direction as when it was stored in the original box, that is, it will be folded in the direction that was already creased, so folding will be performed. Can be smooth.

In many cases, a swing mechanism is provided to improve the stackability of continuous paper. The swing mechanism is a mechanism for forcibly shaking the sheets in accordance with the folding of the continuous sheet to stack the sheets correctly. Also in this case, since the initial position of the swing of the swing mechanism is determined to be either left or right at the time of setting the paper, it is determined that the folding perforation of the first page is set at the peak or the valley at the time of setting the paper. .

That is, in order to stack the continuous paper correctly, it is necessary to set the folding perforation of the continuous paper to a peak or a valley when setting the continuous paper. Here, a conventional continuous paper transport device having a swing mechanism will be described with reference to FIG.

FIG. 5 is a schematic diagram of a printing machine provided with a conventional continuous paper transport device. In the figure, 1 is a hopper for storing continuous paper before printing, 2 is continuous paper, 3 is a table,
Reference numeral 4 denotes a paper transport unit.

Reference numeral 5 denotes an electrophotographic unit, 6 denotes a fixing unit, and 7 denotes a paper transport roller for feeding the continuous paper 2 from the fixing unit 6 to the stacker 8. Reference numeral 9 denotes a control unit.

On the upper portion of the stacker 8, a swing member 8a for changing the feeding direction of the continuous paper 2 in accordance with the fold direction of the perforation, a paper guide 8b for aligning the continuous paper 2, and the continuous paper 2 are placed. Stacker table 8c to be placed
And

In the conventional continuous paper transporting apparatus configured as described above, when the continuous paper 2 is loaded into the paper transporting unit 4, it is confirmed that the folding perforation of the first page of the paper on the table 3 is a mountain. The continuous paper 2 can be smoothly stacked on the stacker 8 by folding it in two at the mountain position.

[0014]

However, since the peaks and valleys of the perforations are visually determined, if the determination of the peaks and valleys is incorrect, the peaks and valleys of the continuous paper are stacked when they are stacked on the stacker 8. Is stored in the hopper 1 in reverse. In such a case, folding with the stacker 8 cannot be performed smoothly, causing a stacker jam.

In this case, the cause of the stacker jam is an erroneous operation, but it is desirable that an apparatus which does not erroneously operate by anyone. Further, the above-described operation is troublesome in terms of operability when setting paper, and causes useless work. The printing speed of recent printing apparatuses has been improved, and accordingly, operability has been improved.

The above operation also causes waste of paper. In recent years, the use of printing apparatuses has been widespread due to the improvement in printing quality, and the printing apparatuses have been used for important documents such as securities paper, and the price per sheet may be high. Therefore, it has become important to reduce waste of paper as much as possible.

An object of the present invention is to prevent a stacker jam caused by an erroneous operation due to visually determining the folds and valleys of a folding perforation of a sheet when setting the sheet, and to improve the operability. It is an object of the present invention to provide a sheet transporting apparatus that eliminates waste of sheets caused by the above.

[0018]

According to the present invention, there is provided a continuous paper transport apparatus for a printing press, which transports continuous paper on a continuous paper transport path.
Tractor mechanism that stretches in a constant direction
The uneven shape that remains on the front and back of the
By providing a displacement sensor for detecting
A structure for detecting peaks and valleys at a fold portion is provided, and a control device for changing the direction of the swing member based on signals of the peaks and valleys detected by the displacement sensor is connected to a driving device for the swing member.

[0019]

Since the direction of the fold of the continuous paper is detected by the displacement sensor and the direction of the swing member is changed so as to correspond to the direction, it is not necessary to visually check for peaks and valleys, and the first page of the paper is not required. The stacking state in the stacker section is not affected by the direction of the fold.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a schematic configuration diagram of a printing press provided with a continuous paper transport device according to the present invention, FIG. 2 is a side view showing an enlarged sensor unit, and FIG. 3 is a block diagram of the continuous paper transport device according to the present invention. 4 is a graph showing a waveform of a detection signal and a motor signal of the displacement sensor. In these figures, the same or equivalent members as described in FIG. 5 are denoted by the same reference numerals, and detailed description is omitted.

In these figures, reference numeral 11 denotes a displacement sensor for detecting the peaks and valleys of the folding perforations of the continuous paper 2, and the displacement sensor 11 is arranged and fixed at a position on the table 3 which serves as a transport path for the continuous paper 2. ing. The displacement sensor 11 comprises an optical displacement sensor, and in principle, irradiates a semiconductor laser to the surface of the continuous paper to reflect the semiconductor laser.
By reading the reflected light with an optical position detecting element, the irregularities (peaks and valleys) of the object (continuous paper 2) are detected by the amount of movement of the reflected light.

Reference numeral 12 denotes a servo motor for driving the swing member 8a. As shown in FIG. 3, the servo motor 12 has a rotating shaft connected to the swing member 8a via a link member 12a. 9 and is configured to be controlled by the control unit 9.

The servo motor 12 is configured such that its stop position is the initial position at either the point A or the point B shown in FIG.

The control unit 9 controls the servo motor 12 according to the peak and valley signals detected by the displacement sensor 11.
Is operated to change the direction of the swing member 8a to a direction corresponding to the direction of the folding perforation.

Next, the operation of the continuous paper transport device according to the present invention will be described. The continuous paper 2 placed on the hopper 1 is folded into two on the table 3 so as to match the perforation of the first page of the paper with the folding perforation and then loaded into the paper transport unit 4. Then, a sheet transport switch (not shown) is turned on to operate the tractor unit 4a. In this manner, the continuous paper 2 is stretched on the table 3 in the transport direction with a constant tension.
It is transported while being stretched.

When the continuous paper 2 moves on the table 3, the displacement sensor 11 provided in the paper transport unit 4 is stretched.
The peaks and valleys of the folded perforations are detected from the uneven shape remaining as a fold on the front and back surfaces of the continuous paper 2 . The folding perforations are indicated by reference symbol A in FIG. Then, the data (peak and valley signals) is sent to the control unit 9. The control unit 9 determines the peak and valley of the first page, and controls the direction of the swing member 8a. At this time, the signals of peaks and valleys are determined, and the motor signal shown in FIG.

That is, 1 of the continuous paper 2 at the time of paper setting
When the displacement sensor 11 detects the valley of the perforation of the page, the valley signal is sent to the motor signal (valley) via the control unit 9.
Is output. Then, the stop position of the servomotor 12 is set to the initial position B, and the servomotor 12 stops. That is, the swing member 8a stops rightward. Under this condition, the path through which the continuous paper 2 enters along the stacker 8 is the same as the continuous paper on the stacker table 8c in FIG. 1, and the continuous paper 2 stops in the form of a fold perforation. Conversely, if the folding perforation of the first page becomes a mountain when the continuous paper 2 is set, the initial position of the swing member 8a is similarly set to the left.

For this reason, if the first perforation of the first page is a valley, the direction of the swing member 8a is controlled to the right in FIG. 1;

The continuous paper 2 sent from the electrophotographic section 5
Enters the stacker 8 through the fixing unit 6 and drops into the stacker table 8c through the swing member 8a.
At this time, since the direction of the swing member 8a is controlled according to the folding perforation of the first page, the continuous paper 2 falls along the swing member 8a. Then, in the stacker table 8c, the leading end of the continuous paper 2 hits the paper guide 8b and is set at the correct position while being folded in two, and the paper setting is completed.

Therefore, when the continuous paper 2 is set,
Regardless of whether the folding perforation of the page is a peak or a valley, the direction of the swing member 8a is controlled by the displacement sensor 11 detecting the peak or the valley of the continuous paper 2.
The sheets are correctly stacked in the stacker table 8c as per the perforations.

For this reason, the stacker jam in the stacker table 8c during paper setting is greatly reduced.

Even if the folding perforation of the first page of the continuous paper 2 is crested during paper setting,
Since it is not necessary to delete the page, waste of the paper due to this can be omitted.

Since it is not necessary to visually confirm the peaks and valleys of the folding perforations on the first page of the continuous paper 2 when setting the paper, it is very useful for improving the operability of the operator.

[0034]

Continuous sheet conveying apparatus for a printing press according to the present invention, as described above, according to the present invention are transportable continuous paper on the transport path of the continuous paper
A tractor mechanism that stretches with a constant tension in the feeding direction and this pulling mechanism
Concavo-convex shape that remains as folded on the front and back of stretched continuous paper
By providing a displacement sensor that detects the shape,
Crease of the fold portion of the paper, a structure for detecting a valley, the drive unit of the swing member, the mountain said detected by the displacement sensor, since connecting a control unit to change the orientation of the swing member on the basis of the valley of the signal, the displacement sensor As a result, the direction of the fold of the continuous paper is detected and the direction of the swing member is changed so as to correspond to the direction. The stacking state in the stacker section is not affected.

Therefore, the stacker jam caused by erroneous setting of the folding perforation at the time of setting the paper is greatly reduced.

Further, even when the folding perforation of the first page of the sheet is valley at the time of sheet setting, the first page does not need to be deleted, so that the sheet is not wasted. Since it is not necessary to visually check the peaks and valleys of the folding perforations on the first page of the sheet when setting the sheet, the operability is improved. Further
During the transport of the continuous paper,
Therefore, the unevenness detection system can be incorporated in the transport system,
There is also an effect that the size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a printing press provided with a continuous paper transport device according to the present invention.

FIG. 2 is an enlarged side view showing a sensor unit.

FIG. 3 is a block diagram of a continuous paper transport device according to the present invention.

FIG. 4 is a graph showing waveforms of a detection signal from a displacement sensor and a motor signal.

FIG. 5 is a schematic configuration diagram of a printing press provided with a conventional continuous paper transport device.

[Explanation of symbols]

 2 Continuous paper 3 Table 4 Paper transport unit 8 Stacker 8a Swing member 9 Control unit 11 Displacement sensor 12 Servo motor

Claims (1)

(57) [Claims] 1. A continuous paper transport device for a printing press, wherein a swing member that changes a direction of carrying out the continuous paper according to the direction of a fold is provided in a stacker section that accommodates the continuous paper. With constant tension in the transport direction
Exposed tractor mechanism and front and back sides of this stretched continuous paper
Sensor that detects the uneven shape that remains as a fold
By setting the peaks and valleys at the folds of the continuous paper
And a control device for changing a direction of the swing member based on a signal of a peak or a valley detected by the displacement sensor is connected to the drive device of the swing member. apparatus.