JPH05178493A - Automatic document conveying device - Google Patents

Abstract

(57) [Summary] [Purpose] To allow the user to recognize the open / closed state of the cover without adding new parts. [Structure] When the upper document guide plate 8 is opened, a document presence sensor 9, a document size detection sensor 10 and a document length detection sensor
The actuator 15 of each of the 11 sensors is a torsion coil spring.
As it is urged by 16 in the direction opposite to the document transport direction,
The outputs of these sensors are held OFF. But,
The actuator 20 of the manuscript page shortening sensor 17 swings clockwise in the drawing to a position where the weight of the manuscript 20 is balanced by the amount by which the upper manuscript guide plate 8 is opened and tilted, and the light shield 20a functions as a light emitting part and a light receiving part. Since the light from the light emitting portion is incident on the light receiving portion, the output of the document page shortening sensor 17 changes from OFF to O.
Become N. That is, the open / closed state of the cover can be detected by detecting the change in the inclination of the actuator 20 of the document page shortening sensor 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder for continuously carrying a plurality of documents into a facsimile machine, a copying machine or the like.

[0002]

2. Description of the Related Art Conventionally, there is means for detecting and notifying whether or not a cover is opened by a microswitch, a photocoupler, etc. arranged near a cover of an automatic document feeder in a facsimile machine, a copying machine or the like. It was

FIGS. 3 and 4 show the structure of a conventional automatic document feeder, in which 1 is a pickup which is raised at the time of sheet feeding and pulls out the originals one by one from under a bundle of originals stacked on an original table. Roller 2 is a paper feed roller that conveys the original drawn by pickup roller 1. 3 is a paper feed roller 2 that conveys only the bottom original in the figure when a plurality of originals are drawn from a bundle of originals. , Separation rollers 4 for preventing the conveyance of other documents, and two document conveyance rollers 4 for feeding the document sent from the paper feed roller 2 to the facsimile apparatus,
Reference numeral 5 is two pressure rollers for pressing the original document against the original document feeding roller 4, reference numeral 6 is a lower original document guide plate on the carry-in side installed so that the upper parts of the picked-up roller 1 and the paper feed roller 2 that are raised project. An unloading-side lower document guide plate installed so that the upper part of the document transport roller 5 slightly projects, and 8 is a separation roller 3 at a position facing the paper feed roller 2 and a document transport roller 4
The upper document guide plate is provided with the pressure roller 5 at a position opposed to the upper document guide plate. The upper document guide plate 8 is rotatably supported on the carry-out side. Reference numeral 9 denotes a document presence / absence sensor that detects whether or not the document is on the document table, and 10 is a document size detection sensor that detects the size of the document based on the width of the document on the document table. A4
This is installed when the facsimile machine is capable of transmitting both a B4 size document and a B4 size document. 11 is a document length detection sensor for detecting the leading edge and trailing edge of the document to control the start and end of reading of the document, and 12 is the document page shortening that detects whether the trailing edge of the document is missing or not. The sensor detects the trailing edge of the document already fed by the document page shortening sensor 12, and when the output is turned off, the next document is immediately fed so that the interval between the documents sequentially fed can be increased. In order to save the communication charge when sending many originals, the original length detection sensor 11 detects the trailing edge of the original in a facsimile machine without the original page shortening sensor 12. Since the next original is fed when it is detected, the interval between the original pages is shortened by the installation interval between the original page shortening sensor 12 and the original length detection sensor 11, and the communication fee increases.

In the conventional example thus constructed, each of the document presence sensor 9, the document size detecting sensor 10, the document length detecting sensor 11 and the document page shortening sensor 12 mounted on the upper document guide plate 8 emits light. The sensor body 13 and the shaft support 14 projecting from the sensor body 13 so that the light shield 15a moves between the light emitter and the light receiver. Actuator 15 suspended swingably
And a light-shielding member 15a is located between the light emitting portion and the light receiving portion, and includes a torsion coil spring 16 for biasing the actuator 15 in the direction opposite to the document conveying direction so that the output is turned off.
(See Figure 5).

Therefore, when the original passes through the original presence sensor 9, the original size detecting sensor 10, the original length detecting sensor 11 and the original page shortening sensor 12, the actuator 15 is lifted in the clockwise direction in the figure, Since the light shield 15a is retracted between the light emitting portion and the light receiving portion, the light from the light emitting portion is incident on the light receiving portion, and the document presence / absence sensor 9, the document size detecting sensor 10, the document length detecting sensor 11, and the document page shortening sensor. The output of each of the 12 sensors is turned on (see FIG. 3). After the document passes, the torsion coil spring 16 pushes down the actuator 15 in the counterclockwise direction in the figure, and the light shield 15a is inserted between the light emitting portion and the light receiving portion. When the light is not incident on the light receiving portion, the outputs of the original presence sensor 9, the original size detecting sensor 10, the original length detecting sensor 11, and the original page shortening sensor 12 are turned off (see FIG. 3). Further, even if the upper document guide plate 8 is opened when the document is jammed or the like, the torsion coil spring 16 causes the actuator 15 to move.
Since the document is urged in the direction opposite to the document conveyance direction, the outputs of the sensors of the document presence / absence sensor 9, the document size detection sensor 10, the document length detection sensor 11, and the document page shortening sensor 12 are OF.
It is held at F (see FIG. 6).

[0006]

By the way, in a low-priced facsimile machine or the like, in order to reduce the cost,
In many cases, the cover open / close detection means is deleted. Therefore, if the originals are fed in the half-opened state where the upper original guide plate 8 is not fixed at a predetermined position, there is a problem in that multiple feeding of multiple originals is a problem.

The present invention has been made to solve such a problem, and provides an automatic document feeder which allows a user to recognize the open / closed state of a cover without adding new parts. The purpose is that.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a first detecting means in which a swing member is suspended in a swingable manner, and a swing member in which the swingable suspension is suspended in an original conveying direction by an urging member. Second detecting means biased in the opposite direction is provided, and the change of the inclination of the swinging members of the first detecting means and the second detecting means contacting the original is detected to detect the original. The presence / absence of the document, the size of the document, and the like are identified, and the change in the inclination of the swinging member of the first detection unit when the cover is closed and half-opened is detected to detect the open / closed state of the cover.

[0009]

According to the present invention, the first detection means in which the swing member is swingably suspended and the swing member in which the swing member is suspended in the direction opposite to the document transport direction are urged by the biasing member. By simply attaching the biased second detection means, the open / closed state of the cover can be detected without increasing the manufacturing cost of the automatic document feeder. As a result, even in a low-priced facsimile apparatus or the like, the cover opening / closing detecting means can be attached, and it becomes possible to prevent the double feeding of originals which collectively send out a plurality of originals.

[0010]

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

1 and 2 show the configuration and operating state of an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 3 denote the same parts, and 17 denotes the same. ,
Sensor body 18 with light emitting part and light receiving part facing each other
And a document page shortening sensor including an actuator 20 swingably suspended by a shaft support 19 projecting from the sensor body 18 so that the light shield 20a moves between the light emitting portion and the light receiving portion.
As shown in FIG. 1, the document page shortening sensor 17 is attached to the upper document guide plate 8.

In this embodiment having such a configuration, when the document passes through the document presence sensor 9, the document size detecting sensor 10, the document length detecting sensor 11 and the document page shortening sensor 17, the actuator 15 is operated. Since the light shield 15a is lifted in the clockwise direction in the figure and retracts from between the light emitting portion and the light receiving portion, the light from the light emitting portion enters the light receiving portion, and the document presence / absence sensor 9, the document size detection sensor 10, the document length are detected. Detection sensor 11
Also, the output of each sensor of the document page shortening sensor 17 is turned on.

After the document has passed, the actuators 15 of the document presence sensor 9, the document size detection sensor 10 and the document length detection sensor 11 are pushed counterclockwise in the figure by the torsion coil spring 16. Since the light shield 15a is inserted between the light emitting portion and the light receiving portion, the light from the light emitting portion does not enter the light receiving portion, and each sensor of the document presence sensor 9, the document size detecting sensor 10 and the document length detecting sensor 11 is detected. At the same time that the output of is turned off, the actuator 20 of the document page shortening sensor 17 swings counterclockwise in the figure to a position where its weight is balanced, and the light shield 20a is inserted between the light emitting part and the light receiving part. Therefore, the light from the light emitting portion does not enter the light receiving portion, and the output of the document page shortening sensor 17 is also turned off.

However, when the upper original guide plate 8 is opened when the original is jammed or the like, the actuators 15 of the original presence / absence sensor 9, the original size detecting sensor 10 and the original length detecting sensor 11 are rotated by the torsion coil spring 16. Since the document is conveyed in the direction opposite to the document conveying direction, the document presence / absence sensor 9,
The outputs of the original size detection sensor 10 and the original length detection sensor 11 are held OFF (see FIG. 2). However, the actuator 20 of the manuscript page shortening sensor 17 swings clockwise in the drawing to a position where its own weight is balanced by the amount by which the upper manuscript guide plate 8 is opened and tilted, and the light shield 20a receives the light emitting portion and the light. Since the light from the light emitting portion is incident on the light receiving portion, the output of the document page shortening sensor 17 changes from OFF to ON (see FIG. 2).

By the way, in the state where the original has not passed,
When the output of the document page shortening sensor 17 is OFF, the outputs of the document presence / absence sensor 9, the document size detection sensor 10, and the document length detection sensor 11 are also OFF. Also, the output of the document page shortening sensor 17 is 0 when the document is passing.
When it is N, at least one output of the document presence / absence sensor 9, the document size detection sensor 10 or the document length detection sensor 11 is ON, or all the outputs thereof are ON.
On the other hand, when the upper document guide plate 8 is opened when the document is jammed or the like, the output of the document page shortening sensor 17 is turned on, but the document presence / absence sensor 9, the document size detection sensor 10, and the document length detection sensor The output of 11 remains OFF. Therefore, the upper document guide plate 8 is surely closed at a predetermined position or half-opened due to changes in the outputs of the document presence sensor 9, the document size detection sensor 10, the document length detection sensor 11, and the document page shortening sensor 17. The user can be notified by a liquid crystal display device or the like by detecting whether or not there is a state.

The original size detecting sensor 10 from which the torsion coil spring 16 is removed may be used instead of the original page shortening sensor 17. However, the document presence sensor 9
Detects the document by swinging the actuator 15 independently when setting the document and turning it on.
It cannot be used as a means for detecting the open / closed state of the cover. Further, the document length detection sensor 11 also detects whether or not the document has passed by swinging the actuator 15 to turn it on and off each time the document passes, so that the open / close state of the cover is detected. It cannot be used as a means.

Further, although the automatic document feeder has been described in the present embodiment, it can also be used in an automatic recording paper feeding device for continuously carrying a recording paper for recording an image or the like into a facsimile machine, a copying machine or the like. ..

[0018]

As described above, according to the present invention,
An upper document guide plate includes a first sensor in which an actuator is suspended in a swingable manner, and a second sensor in which an actuator in which the swingable suspension is suspended is biased by a torsion coil spring in a direction opposite to the document transport direction. Just by attaching it to, without increasing the manufacturing cost of the automatic document feeder,
It is possible to detect the open / closed state of the cover. As a result, even in a low-priced facsimile device or the like, the cover opening / closing detecting means can be attached, and the opening / closing state of the cover can be notified to the user by the liquid crystal display device or the like. It is possible to prevent double feeding of originals that are sent together.

[Brief description of drawings]

FIG. 1 is a perspective view of a sensor used in an embodiment of the present invention.

FIG. 2 is a diagram showing an operating state of the actuator of the sensor when the upper document guide plate is opened in one embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional automatic document feeder.

FIG. 4 is a plan view of an upper document guide plate of a conventional automatic document feeder.

FIG. 5 is a perspective view of a sensor used in a conventional automatic document feeder.

FIG. 6 is a diagram showing an operating state of the actuator of the sensor when the upper document guide plate is opened in the conventional automatic document feeder.

[Explanation of symbols]

9, 10, 11 ... Sensor (second detecting means), 15, 20 ... Actuator (oscillating member), 16 ... Torsion coil spring (biasing member), 17 ... Sensor (first detecting means).

Claims (1)

[Claims] 1. An automatic document feeder for continuously loading a plurality of documents, comprising a first detecting means having a swing member suspended in a swingable manner, and a swing member suspended in a swingable manner. Second biased by the biasing member in the direction opposite to the document transport direction
Detecting means for detecting the presence or absence of the original document and the change of the inclination of the swinging members of the first detecting means and the second detecting means contacting the original document. The automatic document feeding is characterized in that the open / closed state of the cover is detected by identifying the size and the like and detecting the change in the inclination of the swinging member of the first detecting means when the cover is closed and when the cover is half opened. apparatus.