JPH0585650A - Paper sheet conveyance detecting device - Google Patents

Abstract

PURPOSE:To detect paper sheet conveyance (a paper sheet jam) while preventing a paper sheet from hitching. CONSTITUTION:Cut-off parts 21, 21 for sprocket holes inclined to the direction of paper sheet conveyance are provided in respective tip parts which face a conveyance route of a paper sheet, of a light projecting part 12 and a light receiving part 15 of a photosensor 11. Further, sensor angle covering members 31 are attached to the light projecting part 12 and the light receiving part 15 of the photosensor 11 to prevent their respective tip parts 13, 16 facing the conveyance route from coming in contact with the sprocket holes of the paper sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveyance detecting device.

[0002]

2. Description of the Related Art Conventionally, a paper feed detecting device is generally provided on a paper feed path of a printer or the like.

FIG. 5 shows a schematic structure of a conventional sheet conveyance detecting device 10A.

In the figure, reference numeral 11 denotes a photo sensor, which is arranged close to the tractor 1 as a sheet conveying device. Here, the tractor 1 is a unit that conveys the paper P, in which the feed holes Ph are formed at a predetermined pitch interval, in the arrow X direction along the feed path while engaging with the feed holes Ph.

By the way, the photo sensor 10 is composed of a light projecting portion 12 and a light receiving portion 15 which are opposed to each other with a predetermined distance therebetween. The feed hole Ph of the paper P is configured to pass between the light projecting unit 12 and the light receiving unit 15. In addition,
The photo sensor 11 is connected to detection control means (not shown).

Therefore, when the paper P is sent along the transport path, the photo sensor 11 detects the presence or absence of the feed hole Ph of the paper P passing between the light projecting section 12 and the light receiving section 15, and O
Generate an N / OFF signal. And the detection control means,
A paper jam is detected by the ON / OFF signal because the ON signal and the OFF signal are not switched within a predetermined time (time corresponding to the paper feed hole pitch interval).

[0007]

By the way, in the above-described sheet transport detecting device, the light projecting portion 12 or the light receiving portion 15 of the photo sensor 11 is caused by the looseness of the sheet that occurs during the sheet transportation.
The feed holes Ph of the paper P may be caught at the corners of the front end portions 13 and 16 of the sheet, and jam may occur.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a sheet conveyance detecting device capable of detecting a sheet jam while preventing the sheet from being caught.

[0009]

According to a first aspect of the present invention, there is provided a sheet feeding hole which is disposed on a sheet conveying path in which feeding holes are formed at a predetermined pitch and which passes between a light projecting portion and a light receiving portion. In a paper conveyance detection device having a photosensor that detects the presence or absence of an ON / OFF signal and generates a ON / OFF signal, and detects the paper conveyance based on this ON / OFF signal. It is characterized in that a feed hole escape portion inclined with respect to the sheet conveying direction is provided at each tip portion facing the path.

According to the second aspect of the present invention, the presence / absence of a paper feed hole which is arranged on the paper feed path in which the feed holes are formed at a predetermined pitch interval and which passes between the light projecting portion and the light receiving portion is detected. In a paper conveyance detecting device having a photo sensor for generating an ON / OFF signal and detecting the paper conveyance based on the ON / OFF signal, the light projecting section and the light receiving section of the photo sensor are provided with the light projecting section and the light projecting section. It is characterized in that a sensor corner covering member is mounted to prevent the corners of the front end portions of the light receiving portion facing the paper conveyance path from coming into contact with the paper feed holes.

[0011]

According to the first aspect of the invention, even when the sheet is loosened during the sheet conveyance and the feed hole of the sheet comes into contact with the tip portion (that is, the feed hole escape portion) of the light projecting portion or the light receiving portion of the photo sensor, Since the escape portion is inclined in the sheet conveying direction, the sheet feeding hole is lifted up and released from the feeding hole releasing portion as the sheet is conveyed. This prevents the paper from being caught.

Therefore, it is possible to detect the sheet conveyance (sheet jam) while preventing the sheet from being caught.

According to the second aspect of the present invention, even if the sheet is loosened during sheet conveyance, the sensor corner covering member causes the feed hole of the sheet to face the corner of each of the light projecting portion and the light receiving portion of the photosensor facing the sheet conveying path. Contact with the part is prevented. This prevents the paper feed hole from being caught in the light projecting portion and the light receiving portion of the photo sensor.

As described above, since the sensor corner covering member is simply attached to the existing (generally commercially available) photo sensor without any special work, the cost can be further reduced and the paper can be prevented from being caught. In addition, it is possible to detect the sheet conveyance (sheet jam).

[0015]

Embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) As shown in FIG. 1, a sheet conveyance detecting device 10 according to the present embodiment is arranged on a conveyance path of a sheet P in which feed holes Ph are formed at a predetermined pitch interval and emits light. Feeding hole P for the paper P passing between the section 12 and the light receiving section 15
The photo sensor 10 detects the presence or absence of h and generates an ON / OFF signal, and a detection control unit (not shown) that detects paper conveyance (paper jam) based on the ON / OFF signal.

The same components as those shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the front end portions 1 of the light projecting portion 11 and the light receiving portion 15 of the photo sensor 10 which face the transport path of the paper P.
3, 3 and 16 are provided with feed hole relief portions 21 that are inclined in the paper transport direction (arrow X direction).

In the present embodiment, the feed hole relief portion 21
Is formed by shaving the corners of the tip portions 13 and 16 of the light projecting portion 11 and the light receiving portion 15 of the photo sensor 10 facing the transport paths into spherical shapes.

It should be noted that the feeding hole relief portions 21 and 21 are shown in FIG.
As shown in FIG. 2, the light projecting portion 12 and the light receiving portion 15 of the photosensor 10 may be formed by shaving the full-angle portions of the tip portions 13 and 16 into a spherical shape.

Next, the operation will be described.

The sheet P is loosened during transportation, and the feed hole Ph of the sheet P is projected by the light projecting section 12 or the light receiving section 1 of the photo sensor 11.
5, the tip end portions 13 and 16 (that is, the feed hole relief portion 2)
1 and 21), the feed hole escape portion 21 is inclined in the paper transport direction (X direction), and therefore the feed hole Ph of the paper P floats above the feed hole escape portion 21 and is released. Be done. This prevents the paper from being caught.

According to this embodiment, however, the front end portions 13 and 16 of the light projecting portion 12 and the light receiving portion 15 of the photo sensor 11 facing the transport path are provided with feed holes inclined in the paper transport direction (X direction). Since the escape portions 21 and 21 are provided, the sheet is conveyed (sheet jam) while preventing the sheet from being caught.
Can be detected.

The feed hole escape portions 21 and 21 are formed by shaving the corner portions of the tip portions 13 and 16 of the light projecting portion 12 and the light receiving portion 15 of the photo sensor 10 facing the sheet conveying path into spherical shapes. However, even if the feed hole Ph of the paper P comes into contact, it may be formed in any manner as long as the hole Ph can be lifted up by the conveyance.

For example, the sending hole escape portions 21 and 21 may be formed by forming the light projecting portion 12 and the light receiving portion 15 of the photosensor 10 in a cylindrical shape as shown in FIG.

(Second Embodiment) As shown in FIG. 4, the paper feed detecting device according to the present embodiment is configured so that the light feed unit 12 and the light receiving unit 15 of the photo sensor 11 feed the paper feed of the light emitting and receiving units 12 and 15, respectively. A sensor corner covering member 31, which prevents the front end portions 13 and 16 facing the path from coming into contact with the feed holes Ph of the paper P,
31 is attached.

In this embodiment, the sensor corner covering member 31 is provided.
Is composed of an elastic member having a film sheet shape and a U-shaped cross section.

Therefore, even if the paper P is loosened during conveyance, the sensor corner covering member 31 causes the feed hole Ph of the paper P to project the photosensor 10 and the front end portions 13 of the light receiving portions 12, 15.
Since the contact with the corners of 16 is prevented, the sheet is not caught.

[0029]

According to the first aspect of the present invention, the tip of each of the light projecting portion and the light receiving portion of the photo sensor facing the transport path is provided with a feed hole escape portion inclined in the paper transport direction. It is possible to detect the sheet conveyance (sheet jam) while preventing the sheet from being caught.

According to the second aspect of the present invention, in the light projecting portion and the light receiving portion of the photo sensor, the corners of the respective leading end portions of the light projecting portion and the light receiving portion, which face the paper transport path, contact the paper feed holes. Since the sensor corner portion covering member for preventing the sheet is attached, the cost can be further reduced, and the sheet can be conveyed while preventing the sheet from being caught (sheet jam).
Can be detected.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view for explaining a modified example of the feed hole relief portion of the first embodiment.

FIG. 3 is a perspective view for explaining another modification of the feed hole relief portion.

FIG. 4 is a diagram for explaining a second embodiment of the present invention.

FIG. 5 is a diagram for explaining a conventional sheet conveyance detection device.

[Explanation of symbols]

 10 Paper Conveyance Detection Device 11 Photo Sensor 12 Light Emitting Section 15 Light Receiving Section 21 Sending Hole Relief Section 31 Sensor Corner Covering Member

Claims (2)

[Claims] 1. An ON / OFF signal is detected by detecting the presence / absence of a paper feed hole which is disposed on a paper conveyance path having feed holes formed at a predetermined pitch and which passes between a light projecting portion and a light receiving portion. A paper conveyance detecting device having a photo sensor for generating and detecting paper conveyance based on this ON / OFF signal, in which a paper conveyance direction is provided at each of the front end portions of the light projecting portion and the light receiving portion of the photo sensor facing the conveyance path. A sheet conveyance detecting device characterized in that a feed hole escape portion inclined with respect to is provided. 2. An ON / OFF signal is detected by detecting the presence / absence of a paper feed hole which is arranged on a paper transport path in which feed holes are formed at a predetermined pitch and which passes between a light projecting portion and a light receiving portion. In a paper conveyance detection device having a photo sensor for generating and detecting paper conveyance based on the ON / OFF signal, a paper conveyance path of the light projection section and the light reception section is provided in the light projection section and the light reception section of the photo sensor. A sheet conveyance detecting device, which is equipped with a sensor corner portion covering member that prevents a corner portion of each leading end portion from coming into contact with a sheet feeding hole.