JPS6217889Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet guide in an optical reading device.

Conventionally, in the rear upper sheet guide 2 of this type of sheet guide 1, the sheet receiving opening 2a was formed with a steep slope, as shown by the imaginary line in FIG.
If the reading medium 3 has a deformed part such as a curled part 3a or a bent part, the curled part is suddenly pushed down in the direction of the lower sheet guide 6 by the receptacle 2a, and the amount of reflected light reaching the reading head 7 changes greatly. There was a drawback that the device malfunctioned and normal reading operations could not be performed.

Therefore, the present invention provides a run-up section at the receptacle of the rear upper sheet guide so that the reading medium having the deformed portion can be pushed down slowly in the direction of the lower sheet guide in the reading section, thereby solving the above-mentioned drawbacks. The purpose of this invention is to provide a sheet guide that eliminates the problem.

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings.

The optical reading device 9, as shown in FIG.
It has a sheet guide 1 consisting of an upper sheet guide 10 and a lower sheet guide 6 set to sandwich a medium conveyance route 4, and the upper sheet guide 10 is arranged to sandwich a reading section 11 between a front upper sheet guide 12 and a rear upper sheet guide. It has a sheet guide 2. A receptacle 2a is formed on the reading section 11 side of the rear upper sheet guide 2, and the receptacle 2a is formed with an entrance interval E larger than the normal sheet interval W. The receptacle 2a is a run-up section, and the interval is E. It consists of a parallel part 2b having a length L, and an inclined part 2d connecting the parallel part 2b and a guide part 2c forming a normal sheet interval W. on the other hand,
The reading section 11 is provided with a light source lamp 13 and a reading head 7.

Since the present invention has the above configuration, when reading the reading medium 3 using the optical character reading device 9, the medium 3 is sent in the direction A along the medium transport route 4, and the light source lamp is 13 to the reading section 11, and the reading head 7
By capturing the reflected light from the medium 3 passing through the reading section 11, a predetermined reading operation is performed. Now, if the medium 3 has a curled portion 3a etc., the curled portion 3a will first be read by the reading unit 11,
Next, the medium enters the parallel part 2b of the receptacle 2a of the rear upper sheet guide 2, and is conveyed as it is until the leading edge 3b reaches the upper end of the inclined part 2d. The curled portion 3a is larger than the spacing between the sockets 2a and
It is transported without any force being applied to it. Next, the leading end 3b is pushed down by the inclined part 2d, and the curled part 3a is finally conveyed in the direction A while being held between the guide part 2c and the lower sheet guide 6. In No. 11, the distance between the medium 3 and the lower sheet guide 6 is much smaller than that at the tip 3b, and even if the curled portion 3a is pushed down by the inclined portion 2d, the reading portion 1
1, the downward movement of the medium 3 is slow and slight, and the amount of reflected light 15 from the light source lamp 13 does not vary greatly. Note that since the reading head 7 performs reading operations based on relative fluctuations in the amount of reflected light, the curled portion 3
A can be read without malfunction as long as the degree of curl of the curled portion 3a is not extremely sharp and the amount of reflected light changes gradually.

In the above-mentioned embodiment, a parallel portion 2b having a length L is provided as a run-up section in the receptacle 2a. It can be of any shape as long as it can be pushed down slowly in the direction of the lower sheet guide 6, as shown in Figure 2.
The slope part 2d' also serves as a run-up section, and the curl part 3
Of course, a may be gradually pushed down over the entire length L of the section from the entrance portion of the receptacle 2a. Further, it is preferable that the length L of the run-up section is appropriately determined based on a statistically averaged value of the length l of deformation caused by curling or the like occurring in the medium 3.

As explained above, according to the present invention, the receptacle 2a is provided with run-up sections such as the parallel portion 2b and the inclined portion 2d', and the medium 3 has deformed portions such as the curled portion 3a.
However, since the sheet is slowly pushed down in the direction of the lower sheet guide 6 in the reading section 11, the amount of reflected light reaching the reading head 7 does not fluctuate greatly, making it possible to prevent malfunctions of the head 7 from occurring. becomes. Further, since the deformed portion is also guided slowly toward the guide portion 2c by the receptacle 2a, even if the deformation of the medium 3 is relatively large, the medium 3 can be reliably conveyed without jamming at the receptacle 2a. .

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the sheet guide according to the present invention, and FIG. 2 is a front view showing another embodiment of the present invention. 1... Sheet guide, 2... Rear upper sheet guide, 2a... Socket, 2b... Run-up section (parallel part), 2d'... Run-up section (slanted part), 3... Reading medium, 3a... Transformation Part (curl part), 4...
Conveyance route, 6...lower sheet guide, 9...optical reader, 11...reader.

Claims (1)

[Scope of utility model registration request] It includes a lower sheet guide that guides the medium, front and rear upper sheet guides that are provided to sandwich the medium conveyance route from the lower sheet guide and have reading sections between them, and further, the rear upper sheet guide a first conveyance guide part having a substantially constant first distance from the sheet guide; a receptacle having a second distance larger than the distance; and between the first conveyance guide part and the receptacle. and a second conveyance guide section that continuously guides the medium, wherein the second conveyance guide section statistically averages the length of the curled portion at the leading end of the medium. In the vicinity of the point where the leading edge of the medium is positioned at the time when the distance between the position on the medium separated from the leading edge of the medium by the average curl length and the lower sheet guide becomes approximately zero, The medium is connected to the first conveyance guide part such that the distance between the medium and the sheet guide gradually becomes the first distance, and the reading medium having the deformed part is slowly pushed down in the direction of the lower sheet guide in the reading part. A sheet guide characterized in that it is configured such that it can be