JP2002278175A - Document feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent respective members from coming into contact to break when an inner guide 22 which guides a document from a platen glass 8 to a discharge tray is opened and closed as to an automatic document feeder(ADF) 2 which automatically takes a document in and reads its image information. SOLUTION: The inner guide 22 and an inner guide 23 provided on the platen glass 8 are fitted to different rotary shafts 35a and 39a respectively and coupled with each other through connectors 25 and 25, and the inner guide 23 is associatively rotated by the rotation of the inner guide 22 to open the periphery above the platen glass 8. Here, the inner guide 23 is fitted with leaf springs 26 and 26 and the inner guide 22 is provided with a swell part 22c which presses the inner guide 23; and an ADF main body 20 is provided with stoppers 27 and 27 which are made to abut against the leaf springs 26 and 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an automatic document feeder (ADF) attached to a copier, a facsimile, or an image forming apparatus having both functions.

[0002]

2. Description of the Related Art Conventionally, a copying machine, a facsimile, or the like, or an image forming apparatus having both functions,
An automatic document feeder (ADF) is additionally provided. This A
The document set in the DF inlet is automatically loaded into the ADF by the start operation, makes a U-turn along the transport path, passes over the platen glass at the reading position, and reads the image information. And was discharged from the paper discharge port below the intake port. This type of ADF is divided into several covers along the document transport path, and when a document jam or the like occurs, the cover is opened and maintenance is performed. These covers also serve as guide surfaces for the document transport path.The guide cover provided on the platen glass, the guide cover that guides the document from the platen glass to the paper exit, and It is composed of an upper cover and the like for guiding a document, and is rotatably attached to different shafts. A transport roller for feeding a document is attached to these covers, and the transport rollers are arranged at appropriate positions along the document transport path with each cover closed.

[0003]

In the above arrangement, when the upper cover and the guide cover are opened, and the guide cover below the upper cover and the guide cover is rotated to open the vicinity of the upper part of the platen glass, the guide cover is opened. Was released more than necessary with excessive force, and the upper part was hit against the guide cover, which sometimes caused breakage. Further, if the guide cover is closed in this state, there is a problem that the positioning of the guide cover becomes uncertain and the interval between the guide cover and the platen glass is not constant.

Further, in an ADF in which the guide cover is urged in a direction in which the guide cover is closed by a torsion spring or the like to maintain a constant distance between the guide cover and the platen glass, the guide cover is excessively opened by the torsion spring. However, when performing maintenance around the upper part of the platen glass by opening the guide cover, it is necessary to support the guide cover with one hand against the restoring force of the torsion spring. It was very difficult.

[0005]

The present invention uses the following means in order to solve the above problems.
That is, a guide member for a document provided on the platen glass and a guide member for guiding the document from the platen glass to the discharge tray are rotatably mounted on different shafts, respectively. An elastic member is attached to the document feeder main body, and a stopper is provided on the document conveying device main body. When the guide member is opened, the elastic member comes into contact with the stopper to restrict upward rotation of the guide member. .

According to a second aspect of the present invention, a guide member for the document provided on the platen glass and a guide member for guiding the document from the platen glass to the discharge tray are rotatably mounted on different shafts, respectively. The guide member is provided with an elastic member, and the guide member is provided with a pressing portion. When the guide member is closed, the pressing portion presses the elastic member, and the guide member is located on the platen glass side. To keep the distance between the platen glass and the guide member constant.

According to a third aspect of the present invention, a document guide member provided on the platen glass and a guide member for guiding the document from the platen glass to the discharge tray are rotatably mounted on different shafts, respectively. The guide member and the guide member are connected via a connector, and the guide member is rotated in conjunction with the rotation of the guide member so that the guide member is brought into contact with and separated from the platen glass. An elastic member is attached to the guide member, a pressing portion is provided on the guide member, and a stopper is provided on the document conveying device main body. When the guide member is closed, the pressing portion presses the elastic member. Then, the guide member is pressed toward the platen glass side to maintain a constant distance between the platen glass and the guide member, and when the guide member is opened, the elastic member comes into contact with the stopper. To restrict the upward rotation of the said guide member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to a facsimile machine 1. 1 is a perspective view of the facsimile machine 1, FIG. 2 is a perspective view of the ADF 2, FIG. 3 is a front view thereof, FIG. 4 is a side view of the ADF 2 with the ADF cover 21 closed, and FIG. FIG. 6 is a side view of the ADF 2 in an open state, and FIG.
1 is a side view of the ADF 2 with the inner guides 22 and 23 opened.

In the following description, an arrow F in FIG.
The front, rear, left and right positions of each structure will be described with the direction being the front. In addition, the front, rear, left and right positions of each structure in other drawings are also in accordance with FIG.

As shown in FIGS. 1 and 4, at an upper end of the facsimile machine 1, an automatic document feeder (hereinafter, "ADF") 2 for automatically feeding a document to a reading device is provided.

The originals placed on the paper feed tray 3 are separated one by one and taken into the original transport path 9 in the ADF 2, and the image information of the originals is read by the reading device on the apparatus main body side at the platen glass 8. After being read, the sheet is discharged from the sheet discharge port 2 b and stacked on the sheet discharge tray 4. Then, the read image information is converted into an electric signal and transmitted to a destination via a telephone line.

As shown in FIGS. 2 to 6, the ADF 2
Is configured to be openable, so that maintenance can be performed from above the apparatus such as when a paper jam occurs in the document conveyance path 9.

The ADF 2 includes a frame body such as an ADF main body 20, an ADF cover 21, and inner guides 22 and 23, which form a guide surface of the document transport path 9, and rollers 30 arranged along the document transport path 9. 31, 32, 33, 34.3
., And the ADF cover 21 and the inner guides 22 and 23 are attached to the ADF main body 20 so as to be vertically rotatable.

The ADF cover 21 is supported by a rotation fulcrum shaft 29 at the rear end of the ADF main body 20.
Each of the rollers 35 and 23 has one end thereof supported by frames 28 on both sides of the ADF body 20.
It is attached in a detachable configuration by engaging with the rotating shafts 35a and 39a.

Further, the other rollers 30, 31, 32, 33
・ 34 ・ 36 ・ 37 ・ 38 ・ ・ ・ also the ADF main body 2
0Attached to the frames 28 on both sides,
Thereby, each roller 30, 31, 32, 33, 34, 35
.. Are arranged at a fixed position, so that the original can be fed accurately without causing unevenness in feeding.

The inner guides 22 and 23 are connected at both ends thereof by connecting members 25 and 25. When the inner guides 22 are rotated, the inner guides 23 and 23 are linked with each other.
Is also rotated.

The connecting member 25 is a plate having a substantially hook shape and comprises a hook portion 25a and a body portion 25b.
A hole 25c is formed on the inner surface of 5b.

On the other hand, a protrusion 22a is provided at the rear end of both sides of the inner guide 22, and a protrusion 23a is formed at the front end of both sides of the inner guide 23.

The hole 2 of the body 25b of the connecting member 25
5c is fitted into the protrusion 23a of the inner guide 23,
The hook 25a is connected to the protrusion 22 of the inner guide 22.
a, and the inner guides 22 and 23 are connected via the connecting tools 25 and 25.

When the maintenance inside the ADF 2 is performed in such a configuration, first, as shown in FIG.
The cover 21 is opened, and the inner guide 22 is turned upward as shown in FIG. At this time, the connecting tool 25 that engages with the protruding portion 22a of the inner guide 22 is pulled up, whereby the inner guide 23 that is fitted with the connecting tool 25 is also lifted.

In this manner, the upper portion of the platen glass 8 is easily opened, and the inner guide 22
It is possible to look into the back surface (lower surface) of the plate 23 and the upper surface of the platen glass 8, and it is possible to easily perform jam processing, cleaning, and the like.

However, when trying to close the opened inner guide 22, sometimes the inner guide 23 rotated in conjunction with the inner guide 22 does not fall, and when the inner guide 22 is closed, the inner guide 23 is securely positioned. Not always.

Therefore, in the present invention, the elastic member 26 is attached to the inner guide 23 with the following configuration.

As shown in FIGS. 3 and 4, the rear portion of the inner guide 22 is swelled downward, and elastic members are attached to both sides of the inner guide 23 at positions facing the swelling portion 22c. The elastic member includes a leaf spring 26, for example.
26, etc., are attached so that elastic deformation in the vertical direction is possible. In this configuration, when the inner guide 22 is closed, the leaf springs 26 are pressed downward by the lower surface 22d of the bulging portion 22c of the inner guide 22, and the inner guide 23 is positioned.

The inner guide 2 thus positioned
The document conveyance path 9 formed between the document conveyance path 3 and the platen glass 8 is narrowed, and the vertical movement of the document passing through the document conveyance path 9 is reduced, and the reading accuracy of the document is improved.

When the inner guide 22 is opened, the pressing of the leaf springs 26 by the bulging portion 22c is released, and the elastic force of the compressed leaf springs 26 releases the inner guide 22. The bobbin jumps up and assists in its rotation, so that the opening operation of the inner guide 22 is facilitated.

On the other hand, as shown in FIG.
The stoppers 27 are provided on both sides of the ADF main body 20 obliquely below the rotary shaft 35a.

When the inner guide 22 is further opened to rotate the inner guide 23 in an interlocked manner, the stoppers 27, 27 are attached to the leaf springs 26, 2 of the inner guide 23.
6 comes into contact with each other, and the upward rotation of the inner guide 23 is restricted. At this time, the inner guide 23 does not directly hit the ADF main body 20 due to the leaf springs 26 and 26, and the impact is alleviated, so that the damage of both members 20 and 23 is prevented.

When the inner guide 22 is closed, the leaf springs 26 are used to close the inner guide 22.
Direct collision with the inner guide 23 is avoided, and damage to both members 22 and 23 and damage to the platen glass 8 are prevented.

Of course, the leaf springs 26
The ADF 2 having a configuration in which the inner guides 22 and 23 are not connected to each other is also effective by the use of the 5.25. In this case, when the inner guide 22 is opened, the compressed leaf spring 26.
The inner guide 22 jumps up due to the recoil of 26, and the opening operation thereof is facilitated. When the inner guide 22 is closed, the inner guide 22 directly contacts the inner guide 23 by the leaf springs 26. Therefore, damage of both members 22 and 23 is prevented.

[0031]

As described above, the present invention has the following advantages. That is, claim 1
A guide member for the document provided on the platen glass and a guide member for guiding the document from the platen glass to the discharge tray are rotatably mounted on different shafts, and an elastic member is provided on the guide member. When the guide member is opened, the elastic member comes into contact with the stopper and restricts the upward rotation of the guide member. Avoid collision between the member and the member above the guide member,
Damage to both members can be prevented.

According to a second aspect of the present invention, the guide member for the document provided on the platen glass and the guide member for guiding the document from the platen glass to the discharge tray are rotatably mounted on different shafts, respectively. The guide member is provided with an elastic member, and the guide member is provided with a pressing portion. When the guide member is closed, the pressing portion presses the elastic member, and the guide member is located on the platen glass side. By pressing the guide member, the guide member is reliably positioned on the platen glass, and the document conveying path formed between the guide member and the platen glass has a constant interval and passes through this position. Vertical blurring of the document is reduced, and the reading accuracy of the document is improved. When the guide member is released, as soon as the pressing of the elastic member by the pressing portion is released, the guide member jumps up due to the elastic force of the elastic member, and assists in the rotation thereof, and the guide member The opening operation of the device is facilitated, and the operability is improved. Then, when the guide member is opened, the pressing of the elastic member by the pressing portion is released, so that the guide member is rotatable. When the guide member is opened, cleaning of the platen glass and the like is easy. And maintenance is improved.

Further, a guide member for the document provided on the platen glass and a guide member for guiding the document from the platen glass to the discharge tray are rotatably mounted on different shafts. The guide member and the guide member are connected via a connector, and the guide member is rotated in conjunction with the rotation of the guide member so that the guide member comes into contact with and separates from the platen glass. An elastic member is attached to the member, a pressing portion is provided on the guide member,
When the guide member is closed, the pressing portion presses the elastic member to press the guide member toward the platen glass, and the guide member is opened when the guide member is closed. Then, the elastic member comes into contact with the stopper to restrict the upward rotation of the guide member, whereby the guide member is firmly positioned on the platen glass, and the guide member and the platen are fixed. The document conveying path formed between the glass and the glass can be configured at a constant interval, and the vertical movement of the document passing through this position is reduced, and the reading accuracy of the document is improved. When the guide member is released, as soon as the pressing of the elastic member by the pressing portion is released, the guide member jumps up due to the elastic force of the elastic member, and assists in the rotation thereof, and the guide member The opening operation of the device is facilitated, and the operability is improved. When the guide member is further opened, it is possible to avoid a direct collision between the guide member that is rotated in conjunction with the stopper and the member above the guide member, and it is possible to prevent damage to both members. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a facsimile machine 1;

FIG. 2 is a perspective view of ADF2.

FIG. 3 is a front view of the same.

FIG. 4 shows the ADF with the ADF cover 21 closed.
2 is a side view.

FIG. 5 shows the ADF 2 with the ADF cover 21 opened.
Side view.

FIG. 6: ADF cover 21, inner guide 22
The side view of ADF2 in the state which opened 23.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Facsimile apparatus 2 ADF 8 Platen glass 21 ADF cover 22 Inner guide 22c Swelling part 22d Lower surface 23 Inner guide 25 Connector 26 Plate spring 27 Stopper 35a Rotation axis 39a Rotation axis

Claims (3)

[Claims] An original guide member provided on a platen glass and a guide member for guiding the original from the platen glass to a discharge tray are rotatably mounted on separate shafts, and the guide member has an elastic member. And a stopper provided in the body of the document feeder, and when the guide member is opened, the elastic member abuts on the stopper to regulate upward rotation of the guide member. Document feeder. 2. A document guide member provided on a platen glass and a guide member for guiding a document from the platen glass to a discharge tray are rotatably mounted on separate shafts, and the guide member has an elastic member. The guide member is provided with a pressing portion, and when the guide member is closed, the pressing portion presses the elastic member, and the guide member is pressed toward the platen glass. Document transport device. 3. A document guide member provided on a platen glass and a guide member for guiding the document from the platen glass to a discharge tray are rotatably mounted on different shafts, respectively. Are connected via a connector, and the guide member is rotated in conjunction with the rotation of the guide member so that the guide member comes into contact with and separates from the platen glass. The guide member is provided with a pressing portion, and the document conveying device main body is provided with a stopper. When the guide member is closed, the pressing portion presses the elastic member, and the guide member is moved. A document feeder, characterized in that when the guide member is opened while the guide member is opened while being pressed toward the platen glass, the upward movement of the guide member is restricted by the elastic member abutting against the stopper.