JPS6144789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper folding device for a printing press that uses folding perforated paper, such as a line printer.

Generally, the paper used for line printers etc.
Continuous paper with feed holes on both sides and folded into a fan shape at perforations is standard. As the processing power of line printers improves, folding printed paper becomes more difficult. A method is adopted in which the paper holder is moved up and down by a drive system so that the distance between the paper feeding roller and the upper surface of the paper stack is always approximately constant.
The optical detection method in the paper folding device will be explained with reference to FIGS. 1 to 4.

In FIG. 1, a light-receiving element 1 receives radiation from at least one of light-emitting elements 2 and 3, and a sheet of paper 4
It is confirmed that the is folded normally. When the paper stack height increases, the light receiving element 1 does not receive radiation from the light emitting elements 2 and 3 for a long time. At this time, the paper tray 5 is pushed down a predetermined distance by the drive system and stopped at a predetermined position. The moving distance of the paper tray 5 is set so that the distance between the paper feed roller and the paper stacking surface is sufficient to fold the paper 4.

On the other hand, if the light-receiving element 1 is not continuously irradiated even though the paper holder 5 is pushed down, it is determined that the paper 4 is not folded properly, the line printer stops printing, and operator intervention is required. will have to wait.

The relative positional relationship between the two light emitting elements 2 and 3 and the light receiving element 1 is extremely important in order to accurately grasp the folded state of the paper 4. Conventionally, the following method has been adopted to determine these relative positions.

FIG. 5 shows a conventional method for mounting the light emitting elements 2 and 3. A sensor board 6 made of epoxy resin and carrying light emitting elements 2 and 3 is fixed to a sensor holder 7. The sensor holder 7 can be adjusted by screws along the elongated hole 9 to obtain an angle _θ1 . The angle θ ₁ is the light emitting element 2, as shown in FIG.
3 and the light-receiving element 1 in the vertical direction, and is an angle formed by a horizontal line along the width direction of the paper 4 and a straight line connecting the light-emitting elements 2 and 3 and the light-receiving element 1. On the other hand, the angle θ ₂ is for setting the relative position of the light emitting elements 2 and 3 and the light receiving element 1 in the horizontal direction as shown in FIG.
This is the angle formed by each straight line connecting the light emitting elements 2 and 3 and the light receiving element 1 and a straight line along the longitudinal direction of the paper 4, that is, a straight line connecting the light emitting elements 2 and 3 in FIG. The actual method for adjusting these angles θ ₁ and θ ₂ is to bend and correct the U-shaped sensor base 8 according to the mounting state. For this reason, as is clear from FIG. 5, since two sensor boards 6 are mounted, the number of adjustment steps is extremely large, resulting in high costs.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, simplify the relative position adjustment of the optical detection mechanism, and reduce the number of parts.

The present invention focuses on the fact that the relative positional relationship between two light emitting elements and one light receiving element is always unchanged,
The relationship between the sensor base, sensor holder, and sensor board has been devised so that their relative positions can be set appropriately.

FIG. 6 shows a sensor holder 1 constituting the device of the present invention.
0, the back surface, which is the mounting surface of the sensor board 6, is inclined upward at an angle θ ₁ along the vertical direction, and at an angle θ ₂ from approximately the center along the horizontal direction. It is slanted on both sides so that

A hook hole 11 and a fixing hole 12 are provided at the bottom of the sensor holder 10. FIG. 7 is a perspective view of the sensor base 13, and shows the sensor holder 1.
A fixing pin 14 to be inserted into the hook hole 11 of No. 0 is mounted on the top surface, and an adjustment elongated hole 15 is provided at a position corresponding to the fixing hole 12. FIG. 8 is a diagram showing how the sensor holder 10, the sensor base 13 and the sensor board 6 are mounted.
6 into the fixing hole 12 through the adjustment slot 15 and temporarily tighten it, and then insert the sensor holder 10 into the adjustment slot 15 so that the light emitting elements 2 and 3 on the sensor board 6 illuminate the light receiving element 1. After sliding along the sensor holder 10, the position of the sensor holder 10 is fixed with the fixing screw 16.

As described above, the mounting surface of the sensor board 6 of the sensor holder 10 is inclined at predetermined angles θ ₁ and θ ₂ along the vertical and horizontal directions, so that the sensor board 6 can be easily mounted and the light emitting elements 2 and 3 The relative positional relationship between the sensor holder 10 and the light receiving element 1 can be easily adjusted by simply sliding the sensor holder 10.

In the above embodiment, two light emitting elements 2 and 3, that is, two sensor boards 6, are provided, but three or more light emitting elements may be provided. It is sufficient to provide a large number of them.

According to the present invention, the relative position of the light emitting element and the light receiving element can be adjusted by a simple operation of sliding the sensor holder, and the number of adjustment steps can be significantly reduced, so that manufacturing costs can be reduced.
Furthermore, since the relative positional relationship is extremely stable, it can contribute to improving the reliability of the folding device.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an example of an optical fold detection mechanism, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a front view of FIG. 1, and FIG. 4 is a side view of FIG. Fifth
6 and 7 are perspective views showing a sensor holder and a sensor base constituting the present invention, and FIG. 8 is an example of a mounted state according to the present invention. FIG. In the figure, 1 is a light receiving element, 2 and 3 are light emitting elements, 4 is paper, 5 is a paper holder, 6 is a sensor board, 7 and 10 are sensor holders, 8 and 13 are sensor bases, and 9 and 15 are for adjustment. 11 is a hook hole, 12 is a fixing hole, 14 is a fixing pin, and 16 is a fixing screw.

Claims (1)

[Scope of Claims] 1. Provided above the stacking surface of the paper that is ejected from the printing device, folded alternately from front to back along the fold line, and stacked on the paper tray, and provided on both sides of the falling paper. at least two light emitting elements;
and a light-receiving element provided at a position illuminated by the light-emitting element, and the angle between the straight line connecting the light-emitting element and the light-receiving element and the horizontal line along the width direction of the paper on the paper holder is θ ₁ , and each The light-emitting element and the light-receiving element are installed so that the angle between each straight line connecting the light-emitting element and the light-receiving element and the straight line along the longitudinal direction of the paper on the paper holder is θ ₂ , and the light-emitting element is A paper folding device configured to lower the paper tray by a predetermined amount when irradiation is not continued, the paper folding device having at least two sensor boards each carrying the one light emitting element, and the two sensor boards being attached. The sensor board mounting surface on the back side is inclined at an angle θ ₂ on both sides in the horizontal direction, and at an angle θ ₁ in the vertical direction.
a sensor holder formed in the shape of a mountain so as to be inclined; a sensor base on which the sensor holder is slidably placed on the upper surface thereof and has a long hole; and a sensor base that extends through the long hole of the sensor base; A paper folding device characterized by being equipped with a fixing screw that fixes the paper to the sensor base.