JPS5844122Y2 - Paper fold direction detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper fold direction detection device for detecting the direction of the leading fold of continuous printing paper used in a printing device such as a line printer.

For example, in a device that folds paper alternately from front to back using a swinging fin that operates as a pendulum, or in a device that folds paper by blowing air alternately on the front and back sides of the paper, the swing fin or It is necessary to properly control the operation of the air blowing mechanism.

Conventionally, there has been no suitable paper fold direction detection device, and the detection of the fold direction has been made unnecessary by controlling the paper by manual operation by an operator, or by using only sheets having the same fold direction at the top of the paper.

However, this method has the problem of increasing the operator's intervention time and reducing the operating rate of the printing device.In addition, the paper that can be used is limited, and sometimes the first page is discarded, resulting in wasted paper. There was an inconvenience.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to make it possible to detect the direction of the fold at the top of a print sheet by simply adding a simple mechanism.

This invention stops or decelerates the rotation of the feed roller when the starting edge of the printing paper reaches the feed roller, and focuses on the fact that the leading edge of the paper bends in the direction of the fold as the paper is sequentially fed from the printing device. A paper detector provided on at least one side of the paper on the printing device side of the roller detects the presence or absence of bent paper, thereby detecting the direction of the fold.

The figure shows an embodiment of the present invention, in which a printed continuous printing paper 1 having folds 2 at regular intervals and printed on is discharged from a printing device (not shown) and is driven by a drive roller 3 rotated by a motor 5. The sheet is fed out by a feed roller consisting of a driven roller 4 that contacts the drive roller 3 via the sheet 1, and is deposited on the pedestal 6 with the front and back sides alternately folded.

When the starting edge of the paper 1 reaches the feed roller, it is detected by a starting edge detection means consisting of a light emitting element 7 and a light receiving element 8, and the rotation of the motor 5 is stopped or decelerated via the control device 13 based on the detection result.

As a result, the rotation of the feed roller is also stopped or decelerated, and the paper 1 is sequentially fed from the printing device, so that the paper 1 bends as shown in the figure in the direction of the leading fold.

Therefore, the deflection of the paper 1 is detected by the detection means consisting of the light emitting element 9 and the light receiving element 10, and the fold direction is detected.

That is, if the leading fold direction is opposite to that shown in the figure, the paper 1 will bend to the opposite side and will be detected by the detection means on the other side consisting of the light emitting element 11 and the light receiving element 12. The direction of the fold can be detected by knowing whether the presence or absence of the fold is detected.

Note that when the fold direction is detected by the light receiving element 10 or 12, the motor 5 is returned to its original rotational speed via the control device 13, and the feed roller feeds out the paper 1 at a predetermined speed.

Air ducts 14 and 15 alternately spray air onto the front and back sides of the paper 1, and are connected to a blower 17 via a spray direction switching device 16.

Although these air ducts 14, 15 to blower 17 improve the folding characteristics, they are well-known structures and are not related to the structure of the present invention, so a description thereof will be omitted.

As described above, according to the present invention, by simply adding a simple mechanism, it is possible to detect the direction of the fold at the beginning of the paper, and also to detect the presence or absence of paper that bends according to the direction of the fold, which enables reliable detection and improves detection accuracy. It has the effect of

In addition, in the description of the above embodiment, the light emitting elements 9, 1
1 and a light receiving element 10.12 is provided on both sides of the paper 1, but it is provided only on one side of the paper 1, and the starting edge detecting means detects a predetermined value from the time when the starting edge of the paper 1 reaches the feed roller. It is also possible to detect the fold direction depending on whether or not the paper 1 is detected within the time.

In addition to the optical detection means, the detection means can also be replaced with, for example, a microswitch.

[Brief explanation of drawings]

The figure is a configuration diagram showing an embodiment of the paper fold direction detection device of the present invention. In the figure, 1 is continuous printing paper, 2 is a fold line, 3 is a drive roller, 4 is a driven roller, 5 is a motor, 6 is a cradle, ? , 9.11 is a light emitting element, 8° 10.12 is a light receiving element, and 13 is a control device.

Claims (1)

[Scope of Claim for Utility Model Registration] In a device in which a continuous printing paper, which is ejected from a printing device and has creases at regular intervals, is fed out by a feed roller and folded onto a paper holder,
a control means that detects that the starting edge of the paper has reached the feed roller, decelerates or stops the rotation of the feed roller, and bends the paper in front of the feed roller according to the fold; A paper fold direction detection device comprising: a detecting means provided on at least one side of the paper for detecting the presence or absence of the paper bending along the fold. □