JPH0943747A - Document loader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a document loader capable of preventing the attachment/ detachment of a document table from being too easy and a backlash regulation surely even if a simplified attaching/detaching system is adopted. SOLUTION: In the document loader provided with the document table 3 pivoted to be attachable to/detachable from an automatic document feeder body M and a supporting member 28 integrally molded on both sides of the automatic document feeder body M and the document table 3 to pivot it. Further, the supporting member 28 is constituted of a U-shaped first receiving part 30 and a second receiving part 33 consisting of a U-shaped part 31 having both end parts 31a in such a shape that they can be fitted into both end parts 30a of the first receiving part 30 from the outside and a pin 32 which is provided in the central position of the U-shaped part 31 and capable of holding both end parts 30a together with both end parts 31a of the U-shaped part 31, so that the document table 3 is pivotable with respect to the body M of the loader.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to an electrostatographic copying machine,
The present invention relates to a document stacking device of an automatic document feeder installed in an image forming apparatus such as a facsimile or a printer.

[0002]

2. Description of the Related Art In an automatic document feeder (ADF),
By providing a fulcrum on a document table for setting a document, the document table can be rotated to improve the jam handling property. Then, conventionally, a fulcrum function is provided by using a fulcrum member having a pin (with a screw) type, an E-ring fixing type, or a fitting type.

[0003]

However, the fulcrum member of the pin (with screw) type and the E-ring stop type has the following drawbacks. 1. A tool is required because it is fixed with a fulcrum pin when mounting. 2. Not easy to remove. 3. There are many parts such as fulcrum pins and fulcrum shafts.

Further, as shown in FIG. 7, a fitting type fulcrum member for eliminating the above-mentioned drawbacks is provided with a projection 71 having a substantially rectangular vertical cross section provided at a fulcrum portion of a document table 70 and a fulcrum of a document feeding device main body 72. An annular projection 74 having a notch 73 which is provided in the portion and into which the projection 71 can be fitted is formed. By fitting the projection 71 into the annular projection 74 from the notch 73, the manuscript table 70 is made rotatable. However, since the so-called simple attachment / detachment method (the original table 70 comes off when the projection 71 is rotated to the position of the notch 73) is adopted, there are the following drawbacks. 4. It's too easy to remove. That is, the rotating surface 71 having a shape along the arc of the inner peripheral surface (receiving surface) 74 a of the annular protrusion 74.
a and 71a are formed on the protrusion 71, and the rotating surface 7
When 1a is rotated to the position of the cutout 73, the document table 70 is easily removed without the user's awareness. 5. In this case, the inner peripheral surface 74a of the annular protrusion 74 is attached to the rotating surface 7
Since 1a and 71a only reciprocally rotate in response to the opening / closing of the document table 70, that is, since only one inner peripheral surface (receiving surface) 74a is used, there is no rattling of the document table 70 during rotation. The loose regulation is large. 6. Further, due to the poor regulation of backlash, the strength is insufficient, the stability is poor, and the shock absorbing function against shock is weak. 7. Moreover, the paper formed by the upper surface of the transport guide for transporting the original set on the original table 70 to the discharge tray from the paper feed port by various rollers such as the forward feed roller and the original stacking surface of the original table 70. The conveyance line may change, and the original may be caught on this line, which may cause a jam or defective feeding.

The present invention has been made in view of the above problems, and it is an object of the present invention to prevent the original table from being too easily attached and detached even if a simple attachment / detachment method is adopted, and to reliably prevent rattling. An object of the present invention is to provide an original document stacking device.

[0006]

In order to achieve the above object, the present invention relates to a document stacking device of an automatic document feeder installed in an image forming apparatus, which is detachably attached to the main body of the automatic document feeder. The movable document table and a fulcrum member integrally formed on both the automatic document feeder main body side and the document table side for rotating the document table are provided, and the fulcrum member is a U-shaped first member. A U-shaped portion having a receiving portion and both end portions of a shape that can be fitted into both end portions of the first receiving portion from the outside, and a U-shaped portion provided at a central position in the U-shaped portion, the both ends of the first receiving portion being provided. The portion includes a U-shaped portion and both end portions of the U-shaped portion, and a second receiving portion formed of a pin capable of rotatably holding the document table with respect to the main body of the automatic document feeder.

[0007]

A U-shaped first receiving portion, a U-shaped portion having both end portions that can be fitted into both end portions of the first receiving portion from the outside, and a central position in the U-shaped portion are provided. Since the fulcrum member is composed of the second receiving portion having the pin, the inner peripheral surface of the first receiving portion and the pin are received by each other, and the outer peripheral surface of the first receiving portion is U-shaped. A fulcrum function can be provided by receiving at the mold part.

For example, when the first receiving portion is provided on the main body of the automatic document feeder and the second receiving portion is provided on the original table side, the inner peripheral surface of the first receiving portion ( The pin reciprocally rotates on the receiving surface), and the U-shaped portion reciprocally rotates on the outer peripheral surface (receiving surface) of the first receiving portion. In this manner, when the second receiving portion is fitted into the first receiving portion, the fitting is performed from both inside and outside of the both end portions of the first receiving portion, so that the first and second receiving portions are respectively attached to the inside and the outside. The receiving surface can be formed one by one. That is, two receiving surfaces can be formed in the first receiving portion, the original table can be prevented from rattling when the original table is opened and closed, and it is possible to avoid too easy removal.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited thereby.

FIG. 1 shows the whole of a facsimile (hereinafter referred to as FAX) 2 equipped with an automatic document feeder (ADF) 1 on its upper surface. Reference numeral 3 is a document table, 4 is a document discharge tray, and 5 is a paper feed section. (Described later), 6 optically reads a document to be fax-transmitted, and faxes the fax on the receiving side.
An image reading unit for sending a signal, 7 is a FAX on the transmitting side
The optical system unit includes a laser scanning unit that receives a FAX signal transmitted from the laser scanning unit and transmits an electric signal or an optical signal to the imaging unit 8.

The imaging unit 8 is fixed below the optical system unit 7 and has a photoconductor drum 9. Around the photoconductor drum 9, a charger, a paper cassette 10 and a paper feed roller 11 are used as registration rollers. A developing unit 13, a transfer roller 14, a cleaning device 15, and the like for a sheet fed through the pair 12 are provided. Also, 16
Is a paper discharge tray for discharging the paper on which an image corresponding to the FAX reception signal is formed via the fixing roller pair 17.

Reference numeral 18 is a motor for driving the ADF 1, and the ADF 1 is provided with an operating portion 19, a substrate 20, and a speaker 21 arranged downward from the top in this order.

The paper feed section 5 also carries a document (not shown) set on the document table 3 from a paper feed port 23 to a paper ejection tray 4 and a lower guide 24. The front feed roller 2 located on the most upstream side of the guide 24
5 and a paper feed roller 26 located downstream of the forward feed roller 25 for guiding the original fed by the forward feed roller 25 from the paper feed port 23 along the conveyance guide 24 to the downstream side,
It is composed of a conveying roller pair 27 located on the downstream side of the sheet feeding roller 26. Reference numeral 29 denotes a discharge roller pair for discharging the document optically read by the image reading section 6 to the discharge tray 4.

2 to 5, the document stacking device 22 is composed of a document table 3 which is detachably rotatable with respect to the main body M of the automatic document feeder and a fulcrum member 28, which is a fulcrum member 28. The base ends a, a of the automatic document feeder main body M
And a second receiving portion 33 (described later) located at the base ends b and b of the document table 3.

The first receiving portion 30 is composed of a U-shaped annular projecting portion integrally formed on the main body M of the automatic document feeder, while the second receiving portion 33 is the first receiving portion. Inverted U having both end portions 31a, 31a that can be fitted into both end portions 30a, 30a of 30 from the outside.
A letter-shaped annular protrusion (reverse U-shaped portion) 31 and both end portions 30a and 30a of the first receiving portion 30 which are provided at a central position in the reverse U-shaped portion 31 Is composed of a columnar pin 32 that can rotatably hold the document table 3 with respect to the automatic document feeder main body M. Further, the inverted U-shaped portion 31 and the pin 32 are attached to the original table 3
It is integrally formed on the side. Of course, the inner distance between the opposite end portions 31a, 31a of the inverted U-shaped portion 31 is the outer distance between the outer end portions 30a, 30a of the first receiving portion 30 and the outer distance with respect to the opposite end portions 30a, 30a of the first receiving portion 30. It is set so that it can be fitted in from the
The inner diameters of a and 30a are also set to such a diameter that the pin 32 can be fitted into both end portions 30a and 30a.

In the FAX 2 constructed as described above, in order to mount the document table 3 on the main body M of the automatic document feeder, first, as shown in FIG.
The document table 3 on which the second receiving portion 33 having the pin 32 and the pin 32 is formed is substantially vertical, and the inverted U shape is formed in the inverted U shape.
Both end portions 31a and 31a of the character-shaped portion 31 are connected to the first receiving portion 3
It is arranged so as to face both end portions 30a, 30a of 0. And
The document table 3 is fitted into the automatic document feeder main body M from above the automatic document feeder main body M.

FIG. 3B shows the fitted state. That is, by coupling the first receiving portion 30 and the second receiving portion 33, the inner peripheral surface (receiving surface) m including the both end portions 30a, 30a of the first receiving portion 30 and the pin 32 receive each other, and both end portions. Outer peripheral surface (receiving surface) n including 30a, 30a
By accepting the inverted U-shaped portion 31 against
It can have a fulcrum function.

In short, it is possible to provide a fulcrum function by adopting a mechanism in which the U-shaped receiving portion 30 and the receiving portion 33 having the pin 32 at the center of the inverted U-shaped portion 31 receive each other.

Further, this fitting work is easy to remove because the simple attaching / detaching method is adopted, but it is necessary to form the two receiving surfaces m, n on the inner side and the outer side of the first receiving portion 30. Therefore, as compared with the case where only one inner peripheral surface (receiving surface) 74a is used as in the conventional case, there is an advantage that the document table is hard to come off unless the user is aware. That is, in this embodiment, a plurality of receiving surfaces m, n
Is formed on the fulcrum member 28, and the second receiving portion 33 is fitted into the first receiving portion 30 via these receiving surfaces m and n. Therefore, at the time of taking out, the second receiving portion 33 has a certain angle and a certain direction. The fulcrum member 28 is configured so that it cannot be removed unless force is applied to it (the user cannot remove the receiving portions 30, 33 unless the user is aware of it).

Subsequently, in FIG. 3C, the inner peripheral surface (receiving surface) of the first receiving portion 30 is opened or closed according to the opening / closing of the document table 3.
In addition to the pin 32 reciprocally rotating around m, the outer peripheral surface (receiving surface) n
The U-shaped part 31 reciprocally rotates. In this way, the two receiving surfaces m and n can be formed in the first receiving portion 30, and the original table 3 can be prevented from rattling when the original table 3 is opened and closed.

FIG. 6 shows a U-shaped portion 31 of the second receiving portion 33.
A U-shaped auxiliary receiving portion 40 having both ends 40a, 40a wider than the first receiving portion 30 and having a similar shape is integrally formed on the automatic document feeder main body M side so that both end portions 31a, 31a can be fitted from the outside. Another embodiment of the present invention provided by is shown.

In this embodiment, two receiving surfaces m and n can be formed on the first receiving portion 30, and the receiving surface p for the U-shaped portion 31 is provided on the U-shaped auxiliary receiving portion 40 provided further outside.
As a result, the original table 3 can be further prevented from rattling, the strength and stability can be further improved, and the shock absorbing effect against shocks can be strengthened.

In each of the above embodiments, the first receiving portion 30
Although the above is provided by integrally molding on the main body M of the automatic document feeder, the first receiving portion is provided in the inverted U shape on the original table side while the second receiving portion is formed in the U shape. A fulcrum member provided on the main body of the automatic document feeder can also be applied to the present invention.

[0024]

As described above, according to the present invention, while the receiving portion is provided on the main body of the automatic document feeder, the receiving portion having a similar shape is also provided on the original table side so that a plurality of receiving surfaces can be easily detached. Since it is formed as described above, the following effects are obtained. 1. Since a large number of parts are not required to have the fulcrum function, the fulcrum function can be provided with an inexpensive structure. 2. Since the simple attachment / detachment method is adopted, it is easy to remove, but the receiving unit cannot be removed unless the operator is aware of it. 3. Packing is easy because it can be packed in a detached state. 4. It can be easily installed by the user as no tools are required. 5. It is possible to prevent rattling of the document table when the document table is opened and closed. 6. Since the fulcrum function of the present invention does not change even if the receiving parts are made compact, it is advantageous in providing strength in a limited space and can contribute to space saving.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the overall configuration showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration showing a fulcrum member in the above embodiment.

FIG. 3 is an explanatory view of a main part configuration showing a mounting operation of a fulcrum member in the above embodiment.

FIG. 4 is an explanatory diagram of a main part configuration showing a use state of a FAX in the above embodiment.

FIG. 5 is an explanatory diagram of a main part configuration similarly showing a use state of a FAX in the above embodiment.

FIG. 6 is an explanatory diagram of a main part configuration showing another embodiment of the present invention.

FIG. 7 is an explanatory diagram of a main part configuration showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Automatic document feeder, 2 ... FAX, 3 ... Document table, 22 ... Document stacking device, 28 ... Support member, 30 ... First
Receiving portion, 30a, 30a ... Both end portions of the first receiving portion, 31
... inverted U-shaped portion, 31a, 31a ... both ends of the inverted U-shaped portion, 32 ... pin, 33 ... second receiving portion, m, n ... receiving surface of first receiving portion, M ... automatic document feeder main body .

Claims (4)

[Claims] 1. A document stacking device of an automatic document feeder installed in an image forming apparatus, wherein a document table that is detachably rotatable with respect to the main body of the automatic document feeder and an automatic table for rotating the document table. And a fulcrum member integrally formed on both the document feeder main body side and the document table side,
Further, this fulcrum member has a U-shaped first receiving portion, and a U-shaped portion having both end portions of a shape that can be fitted into both end portions of the first receiving portion from the outside, and the inside of the U-shaped portion. It is provided in the central position, and the both end portions of the first receiving portion are U-shaped.
An original stacking device comprising: a second receiving portion formed of a pin capable of rotatably sandwiching an original table with respect to the main body of the automatic original feeder with the both end portions of the character portion. 2. A U-shaped auxiliary receiving portion having both ends wider than the first receiving portion and having a similar shape so that it can be fitted into the both end portions of the U-shaped portion of the second receiving portion from the outside. The document stacking device according to claim 1. 3. The document stacking apparatus according to claim 1, wherein the first receiving portion is provided on the main body of the automatic document feeder and the second receiving portion is provided on the original table side. 4. The document stacking apparatus according to claim 1, wherein the first receiving section is provided on the original table side, and the second receiving section is provided on the automatic document feeder main body side.