JPH0464554A - Correcting mechanism for slanting of paper - Google Patents

Abstract

PURPOSE:To instantly correct slanting of paper by causing the paper to collide with and abut at its end between a pair of timing rollers each being stopped, and also forming a sag in the paper using a conveyance passage which rises or projects on the side of a conveyance surface. CONSTITUTION:Paper P is made to abut at its end on a shaft between a pair of timing rollers 30, 32 even when slanting and the amount by which the end portion shifts from a portion forcibly conveyed by a pair of conveying rollers 20, 22 is absorbed by a sagging portion. When a predetermined time elapses after the paper P is detected by a sensor 28, the pair of timing rollers 30, 32 are started to move and conveyance is started from the end of the paper P which is accurately positioned. In this case, since a conveyance passage 34 between the pair of conveyance rollers 20, 22 and the pair of timing rollers 30, 32 rises or projects on the side of a conveyance surface, a sag is formed in the paper P in the direction in which the paper P is separated from the conveyance surface every time the paper P is stopped by the pair of timing rollers 30, 32 from advancing.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is useful for adjusting the orientation of paper that is fed diagonally in various devices that involve paper feeding, such as paper folding machines, printing machines, and copying machines. This invention relates to an automatic correction mechanism.

[Prior Art] In order to perform predetermined processing on paper, such as folding, printing, copying, etc., it is necessary to accurately position the paper in each device.

In conventional paper processing devices of this kind, the paper width is mainly regulated on the sides of the paper transport path so that the paper is transported in a parallel state.

[Problems to be Solved by the Invention] However, since paper of various sizes is generally handled, it is not possible to control the sides of the paper throughout the conveyance path, and the paper may be processed in a skewed state. be.

In particular, in paper folding machines that handle processed paper such as printed matter rather than new paper, skewing tends to occur when the automatic paper feeder separates and feeds each sheet one by one. There was a problem. In other words, in a paper folding machine that uses a folding plate equipped with a stopper whose position can be adjusted according to the folding position, the leading edge of the paper is fed along the folding plate, and the paper is folded at a predetermined position by the stopper fixed to the stomach. Folding is performed by sandwiching the intermediate slack part of the paper, which is caused by further feeding the paper after it has been stopped, between a pair of folding rollers. Not only does it abut against the edge of the sheet, making it impossible to fold the paper in an appropriate position, but when the paper is thin, there is a problem in that the leading edge corner is bent.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mechanism for correcting the direction of a sheet of paper that is being conveyed in a skewed state in a paper folding machine or other sheet processing apparatus so that the leading edge thereof is perpendicular to the conveyance direction.

[Means for Solving the Problems] The present invention provides a predetermined distance from the pair of conveying rollers, which is shorter than the length of the paper, on the downstream side of the pair of conveying rollers that forcibly conveys the paper fed from the paper feeding section. A pair of timing rollers are arranged at intervals, and the paper fed from the pair of transport rollers is blocked from passing for a predetermined period of time to create slack in the paper, after which transport of the paper is started. . Further, a paper detection means is provided to detect the state of the paper passing through the pair of transport rollers, and based on this signal, the pair of timing rollers is controlled, and the transport path between the pair of transport rollers and the pair of timing rollers is set to the transport surface. The paper is bulged or protruded on one side so that the paper tends to sag on one side.

Specifically, a paper detection signal from the paper detection means is sent to a control section, and the control section issues a drive signal to the timing roller pair after a predetermined period of time.

It is desirable that this time can be adjusted by the operator on the operation panel.

Note that in the present invention, "paper" is not limited to unused paper, but includes printed materials such as catalogs and pamphlets, copies, and other sheet-like materials.

[Function] When the paper passes through the pair of transport rollers, the paper detection means detects this. At this stage, the timing roller pair is stopped, and the timing roller pair starts after a predetermined time after the paper detection means detects the paper. During this time, the paper that is forcibly conveyed collides between the rollers of the timing roller pair.
Progress is temporarily blocked by a pair of timing rollers that have not yet started. The paper still bends due to the conveying force applied, but at this time, even if the paper is skewed, the leading edge of the paper abuts parallel to the axis between the timing rollers, and this leading edge and the conveying force Any deviation in direction from the portion being forcibly conveyed by the pair of rollers will be absorbed by the slack portion. When a predetermined period of time has elapsed since the sheet was detected, the timing roller pair is started and the conveyance of the sheet starts from the correctly positioned leading edge.

Since the conveying path between the pair of conveying rollers and the pair of timing rollers is raised or protrudes toward the conveying surface side, when the paper is prevented from advancing by the pair of timing rollers, the paper always sag in the direction away from the conveying surface.

[Example] Hereinafter, a paper skew correction mechanism of the present invention will be described based on an example shown in the accompanying drawings.

The accompanying drawings show an embodiment in which the present invention is applied to a paper folding machine. In the drawings, numeral 10 denotes a paper feed plate, on which paper P to be folded is placed. The sides of the paper P are aligned by the paper width setting guide plate 12, and the paper P is sent one by one to the transport roller pair 20.22 via the guide plate 14 by the handling plate 16 and the paper feed roller 18. The upper side of the transport roller pair is a driving roller 20, and the lower side is a driven roller 22.
In order to flexibly convey thick to thin paper, the driven roller 22 is moved to a fulcrum 26 by a spring-loaded pressure lever 24.
is supported by

An optical sensor 28 is installed at the exit of the pair of conveyor rollers 20 and 22.
is provided, and this sensor 28 detects that the paper has passed through the pair of transport rollers 20 and 22.

A timing roller pair 30.32 is disposed downstream of the transport roller pair 20.22 with an interval shorter than the length of the paper, and the lower side is a driving roller and the upper side is a driven roller. The timing roller 30 is stopped when the paper is not passing, and starts after a predetermined time after the sensor 28 detects the paper passing. This time varies depending on the rotational speed of the conveyance roller pair 20.22, but when the paper passes the sensor 28, the leading edge of the paper passes through the timing roller pair 30.3.
It is set to start after the two rollers collide and slack occurs. When the sensor 28 detects passage of the leading edge of the paper, it sends a detection signal to the control unit 50. The control unit 50 is
After a time of, for example, 50 m5ec has elapsed since the leading edge of the paper was detected, a drive signal is given to the timing roller 30 to start transporting the paper. The circumferential speed of the timing roller pair 30.32 is set higher than the circumferential speed of the conveyance roller pair 20.22 to reduce the slack that occurs during conveyance. Then, the driving of the timing roller 30 is stopped after the time required to convey the largest sheet of paper, for example 40 muc, has elapsed.

The time from when the sensor 28 detects the leading edge of the paper to when the timing roller 30 is driven is 20.22
Although it may be set to a constant value corresponding to the rotation speed, it is preferable that this time can be changed using a knob or the like on the operation panel so that the degree of slack can be adjusted.

Conveyance roller pair 20.22 and timing roller pair 30.3
The conveyance path 34 between the conveyance paths 34 and 2 transitions horizontally from a rear bending portion 35 that is inclined upward in the direction of travel, and its conveyance surface is formed as a convex surface. Reference numeral 36 denotes a guide plate for guiding the leading edge of the paper between the pair of timing rollers 30 and 32, but this is not necessary depending on the degree of inclination of the conveyance path 34.

40 is a folding device, which includes a first folding plate 41, a second folding plate 42 and folding rollers 43, 44, 45, 46.
Consisted of. Among the folding rollers, reference numeral 43 is a driving roller that performs the first folding of the paper with a driven folding roller 44 and the second folding of the paper with a driven folding roller 45. A press roller 46 cooperates with the folding roller 44 to send the paper to the first folding plate 41.

The paper enters between the folding plate 41 and the guide plate 47 until its leading end abuts against the stopper 48. However, since the paper is forcibly fed even after the contact, the paper bends toward the tangent line between the drive roller 43 and the folding roller 44, and is finally caught between the drive roller 43 and the folding roller 44, forming the first fold. be done.

Furthermore, it is fed into the second folding plate 42 from this first fold,
The driving roller 43 is formed in the same manner as the first fold.
A second fold is formed on the sheet held between the folding roller 45 and the folding roller 45, and the sheet is discharged in the direction of arrow A.

Next, a paper skew correction operation according to the present invention will be explained.

When the sheet passes through the pair of transport rollers 20 and 22, the sensor 28 detects the leading edge of the sheet and sends a detection signal to the control section 50. The paper is conveyed along an upwardly sloping conveyance path 34, guided horizontally by a guide plate 36, and abuts between the rollers of a timing roller pair 30.degree. 32. At this time, since the timing roller pair 30 and 32 are still stopped, the leading edge of the paper comes into contact with the rollers 30 and 32 along the tangential line even if it is diagonal due to the force of further pushing, and is parallel to the roller axis. become. During this time, the paper will sag (approximately 10 mm), but
4 protrudes toward the conveying surface side at the bending portion 35, this slack is naturally formed in the direction away from the conveying path 34. The control unit 50 sends a drive signal to the timing roller 30 after a predetermined period of time after receiving the paper detection signal from the sensor 28 . Since the circumferential speed of the timing roller pair 30.32 is set higher than the circumferential speed of the conveyance roller pair 20.22, the formed slack gradually decreases, and the amount of slack at the trailing edge of the paper is reduced to almost zero. can do.

In this embodiment, the conveying path 34 between the pair of conveying rollers 20.22 and the pair of timing rollers 30.32 is provided with a bending portion 35 so as to protrude toward the conveying surface. The structure for forming in the direction of separation is not limited to this, and may take various shapes, such as curving the conveyance surface in a raised manner. In addition, although this embodiment has been described as an example applied to a paper folding machine,
The present invention is not limited to this, and can be applied to various apparatuses that involve paper conveyance, such as copying machines and printing machines.

[Effects of the Invention] As explained above, according to the paper skew correction mechanism of the present invention, the leading edge of the paper abuts and contacts between both rollers of the timing roller pair in the stopped state, and the paper is transported with a bump or protrusion on the transport surface side. The slack in the paper is created by the path, and the misalignment between the leading and trailing edges of the paper is absorbed by this slack, making it possible to instantly correct skewed paper. Since the operation of the apparatus is exactly the same even when the paper is conveyed parallel to the paper, it is extremely effective when continuously automatically conveying a large amount of paper.

[Brief explanation of the drawing]

The accompanying drawing is a simplified diagram showing an embodiment in which the paper skew correction mechanism of the present invention is applied to a paper folding machine. 2022...Conveyance roller 28...Sensor 30.
32... Timing roller 34... Conveyance path 35...
...Bending section 50...Control section Patent applicant Duplo Co., Ltd.

Claims (3)

[Claims] (1) A pair of transport rollers that forcibly transports the paper fed from the paper feed section, a paper detection means that detects the passing state of the paper passing through the pair of transport rollers, and a pair of transport rollers on the downstream side of the pair of transport rollers. and a pair of timing rollers arranged at intervals and configured to prevent the passage of paper for a predetermined period of time based on a signal from the paper detection means to cause slack in the paper, and then start transporting the paper, A paper skew correction mechanism characterized in that a transport path between the pair of transport rollers and the pair of timing rollers is raised or protrudes toward a transport surface. (2) Paper skew feeding according to claim (1), further comprising a control section that sends a drive signal to the timing roller pair after a predetermined time after receiving the paper detection signal from the paper detection means. Correction mechanism. (3) The paper skew correction mechanism according to claim (2), further comprising means for adjusting the time from receiving the paper detection signal to sending the drive signal to the timing roller pair. .