JPS60683Y2 - Reading head with paper holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reading head having a sheet presser for reading recorded contents from sheets fed to a reading area in an optical reading device.

When feeding paper sheets, for example, it is necessary to prevent paper sheets from lifting up as much as possible in the reading section or printing section of an optical character reading device. For judgment purposes, a lens system is used to focus on the paper sheet.

Although a certain degree of lifting of paper sheets is allowed depending on the depth of focus, there is a limit to how much lifting of paper sheets is allowed in order to detect a sharp image.

Conventionally, in order to prevent this limit from being exceeded, paper sheets were held down on the flat surface of the reading area using methods such as regulating the gap of a fixed paper sheet guide or suctioning the sheets onto a flat surface to make them flat. However, this type of sheet presser narrows the reading range of the reading head that reads the recorded contents of the sheet, and is suitable for general-purpose sheets of various sizes. If the space between paper pressers is wide and the sheets are not pressed properly, bending may occur, the folds may not be pressed, the structure may be complicated and expensive, or noise may be generated. It was not possible to obtain the reading effect.

The purpose of this invention is to provide a paper sheet presser on the reading head, to achieve a narrow presser interval that was impossible with conventional fixed paper sheet pressers, and to sufficiently press the vicinity of the reading part of the paper sheet. We would like to provide a reading head that prevents paper sheets from floating up, widens the reading range of paper sheets compared to conventional ones, is not limited by the size of general-purpose paper sheets, has a simple structure, and has a paper sheet presser that is inexpensive. That is.

Next, a detailed explanation will be given based on the drawings.

FIG. 1 is an explanatory diagram of a reading head section using a conventional fixed sheet presser.

In FIG. 1, a reading head 1 reads black and white data on the surface of a paper sheet by receiving reflected light from a paper sheet 2 that is irradiated with light projected from a light source 5. The distance from the side guide 21 is kept constant, and it is held so that it can move in a direction perpendicular to the plane of the paper.

The rising of the paper sheet 2 on the surface is suppressed by the fixed paper sheet pressers 3 and 4, and the arrow x indicates the feeding direction of the paper sheet 2.

In particular, the fixed paper sheet presser 3 is a guide that opens diagonally in order to prevent paper sheets 2 from being bent or bent and causing paper jams. , the reading range is narrowed by the interval A.

Generally speaking, the diagonal guide of the fixed paper sheet presser 3 can be shortened if both ends of the paper sheet are pressed in the width direction, but the widths of various types of general-purpose paper sheets vary, and the paper sheet is suitable for all of these. A presser foot cannot be installed.

FIG. 2 is an explanatory diagram of a conventional vacuum type reading head.

In FIG. 2, the same reference numerals as in FIG. 1 indicate the same articles.

Arrow 6 indicates the direction of negative pressure. No fixed paper presser is used on the paper sheet 2, and the reading range is not restricted in any way, which is convenient. It is difficult to feed the paper sheets 2 in the x direction when sucking them so strongly that they are removed, and the paper sheets 2 are intermittently sucked weakly when being fed and strongly when stopping and removing the curls.
It is necessary to control the suction force according to the feeding of the liquid, which has various disadvantages such as being complicated, expensive, and noisy.

FIG. 3 is an explanatory diagram of a conventional reading head section using rollers.

In FIG. 3, the same reference numerals as in FIG. 1 indicate the same articles.

The rotating shaft of the roller 7 is pressed by the driving roller 22,
A mechanism for pressing the paper sheets by moving the roller 7 up and down by a distance MB may be added, but this mechanism has the drawback of taking up space in the height direction, and the mechanism is complicated and expensive.

FIGS. 4 to 10 show embodiments of a reading head having a sheet presser according to the present invention.

The structure of the sheet presser in these embodiments is such that it presses the sheet surface smoothly in both the feeding direction of the sheet and the scanning direction of the reading head perpendicular to this. It has a smooth slope, etc. so that even when the paper sheet presser is relatively moved from the edge of the leaf to the surface of the paper sheet, there will be no folding or catching that would be harmful to the paper sheet. It is something.

In FIG. 4, a paper sheet 2 is attached to the reading head 1 and has a slope that prevents the paper sheet from getting caught in the feeding direction x of the paper sheet and the horizontal movement of the reading head perpendicular to this direction.
The projecting members 8 and 9, which are convex when viewed from the side, are made of a material with a low coefficient of friction, and are provided so as to be in contact with the surface of the paper sheet 2.

Further, as shown in FIG. 11 A to E, there are two or three protruding members as shown by a circular portion 20 which is a plan view of the protruding members in the vicinity of the scanning range 19 of the reading head having protruding members. Alternatively, they are positioned as four to prevent the paper sheet 2 from floating up so as not to affect the scanning range 19.

According to this method, it is possible to have a paper sheet presser with a simple structure and low cost without being restricted by various general-purpose paper sheet sizes.

If there is a concern that the paper sheet 2 may move due to friction on the surface of the paper sheet 2 when the reading head moves, rollers or the like may be installed before and after the reading section to also feed the paper sheet 2. It is enough.

In Fig. 5, conical or semicircular legs 10 and 11 are used as paper sheet holders via displaceable springs in place of the protruding members 8 and 9 of Fig. 4.
．． Even if the paper sheet 2 is quite curly, the legs 10 and 11 can escape upwards sufficiently, so that it can be held down so as not to cause a jam.

Note that this paper sheet presser may be provided with a lowering limit to the extent that it touches the paper sheets.

In FIG. 6, the spring-like elastic bodies 12 and 13 bent obliquely with respect to the feeding direction of the paper sheet 2 are shown in FIG. It uses a similar presser foot and has roughly the same effect as the one shown in Figure 5.

In addition, in FIG. 7, a protrusion member consisting of spherical rollers and reguides 14 and 15 as a paper sheet presser can press the paper sheet 2 with appropriate pressure and little friction by its own weight or an added slippery spring (not shown). I can do it.

In FIG. 10, a protrusion member consisting of a cylindrical roller reguide 23 as a paper sheet presser is arranged so as to press both sides of the scanning range 19 shown in FIG. 11, and is almost the same as that shown in FIG. 7. effective.

Note that the ball and cylindrical rolling guides shown in FIGS. 7 and 11 may have a lowering limit to the extent that they come in contact with paper sheets.

In FIG. 8, an annular member 16 having a semicircular cross-section and encircling the projection members 8 and 9 in FIG. 4 as a continuous member is used as a paper sheet holder.

In FIG. 9, a protruding member 17 similar to the protruding member 8 in FIG. 4 is used as a sheet presser on one side only, and the fixed sheet presser 4 in FIG. 1 is used on the other side. This has the effect of preventing movements such as waving of the paper sheets 2 caused by friction with the paper sheets 2 when the reading head is moved by reducing the area of friction with the paper sheets.

Note that such paper sheet holders can be used not only for reading heads but also for heads of printers, optical mark readers, card readers, etc., especially when the moving direction of the head is perpendicular to the feeding direction of paper sheets. effective.

In this way, the reading head with the paper sheet holder according to the present invention has a wider reading range than the conventional fixed paper sheet holder, reliably prevents paper sheets from lifting up, maintains reading accuracy, and can read various types of paper sheets. It has great practical effects in that it can be applied to any size, and the structure of the constituent members is simple and inexpensive.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of a conventional reading head unit, FIGS. 4 to 10 are explanatory diagrams showing an embodiment of a reading head having a sheet presser according to the present invention, and FIG. FIG. 3 is a plan view showing the relationship between the paper sheet presser and the reading scanning range according to the invention. 1...Reading head, 2...Paper sheet, 3
Or 4...Fixed sheet presser, 5...
Light source, 6...Arrow indicating the direction of negative pressure, 7...
...Roller, 8 or 9 ...Protrusion member, 10
to 11...legs, 12 to 13...
... Spring-like elastic body, 14 or 15 ... Ball rolling guide, 16 ... Annular member, 17.
... Protrusion member, 19 ... Reading scanning range, 20 ... Circular part, 21 ... Lower guide of paper sheet 2, 22 ...・・Drive roller, 2
3...Cylindrical rolling guide.

Claims (3)

[Scope of utility model registration request] (1) An optical reading device has a slope that can smoothly press paper sheets in both the feeding direction of paper sheets and the scanning direction of the reading head, and A protrusion member that is convex when viewed from the reading head is provided on the reading head, and a paper sheet presser made of the protrusion member is positioned to such an extent that it touches the surface of the paper sheet, and is moved relative to the paper sheet. A reading head with a paper sheet holder, which is characterized by being able to read paper sheets while reading the paper. (2) The protruding member has a paper sheet presser according to claim 1, which comprises a conical or hemispherical leg on the side closer to the paper sheets, via a displaceable elastic member. read head. (3) A reading head having a sheet presser according to claim 1, wherein the protrusion member is a spherical or cylindrical roller and is a re-guide.