JP3052482B2 - Document holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document pressing device for pressing a document placed on a platen glass of a copying machine.

[0002]

2. Description of the Related Art Conventionally, as a document pressing device of a copying machine, as shown in FIG. 7, a cover 110 and a document pressing plate 111 made of an elastic material are used.
Is mounted rotatably by a hinge fitting 102 at the back side of the camera. In this document pressing device, the document D is set on the platen glass 101 with the operator lifting the front side of the cover 110, and the cover 110 is closed. At the time of this closing operation, the holding plate 11
The first slack portion contacts the document D first (contact point P ₁ ), and thereafter, until the cover 110 is completely closed.
The contact point P ₁ would move to a point P ₂ on the rear side. With this movement, the document D also moves to the back side, and there is a problem that the document is not set at a correct position.

[0003] In recent years, the trouble of exchanging originals has been reduced.
Various types of automatic document feeders (hereinafter, referred to as ADFs) have been provided in order to enhance copy processing capability. The ADF feeds originals one by one from a tray, sets the originals at fixed positions on a platen glass by a transport belt, and discharges the originals from the platen glass after an image scan is completed. ADF
In order to allow an operator to manually set a document on the platen glass, the plate is rotatably mounted on a rear side of the copying machine main body by a hinge fitting so that the platen glass can be opened. Therefore, even in the case of the ADF, there is a problem that the document conveying belt performs the same operation as that of the document pressing plate 111 and the document is displaced.

[0004]

Object, structure and operation of the present invention
An object of the present invention is to provide a document pressing device in which a document placed on a platen glass is not displaced by a closing operation. In order to achieve the above object, the document pressing device according to the present invention is configured such that when the document pressing member is closed with respect to the platen glass, the first contact point of the document pressing member with the platen glass is completely closed. It is characterized in that a means for preventing movement to the back side is provided in between.

[0005] Specifically, the fixed side member of the hinge means is turned around.
Substantially parallel to the movable member provided at a predetermined interval
It can be moved up and down freely in the state and in the back and front directions
It was suspended movably in a substantially horizontal state at predetermined intervals
Document holding member and document holder against platen glass
When closing the member, the platen
Back until the first point of contact with the
Movement inhibiting means for inhibiting movement to
You. In such a configuration, the first contact point of the document pressing member on the platen glass does not move to the back side by the subsequent closing operation, and even if the document pressing member contacts the document during the closing operation. There is no displacement of the document.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a document pressing apparatus according to the present invention. [First Embodiment, see FIGS. 1 to 5] In the first embodiment, the present invention is applied to an automatic document feeder (ADF).

1 and 2, the ADF 10 generally includes a paper feed unit 20, a transport unit 40 centered on a transport belt 41, and a reversing / discharging unit 90. The paper feed unit 20 includes a document tray 21, a pickup roller 24, separating rollers 25 and 26, and registration rollers 28 and 29. The document tray 21 includes a pair of side regulating plates 22 and a front end stopper 23. The document D is placed on the tray 21 with the first page facing downward.
When the solenoid 31 is turned on at the time of paper feeding, the leading end stopper 23 swings downward with the pin 23a as a fulcrum and retracts from the regulation position. The pickup roller 24 is attached to the tip of a lever 27 that can rotate about the support shaft 25a of the normal separation roller 25 as a fulcrum. When the paper is fed, the solenoid 31 is turned on to descend and press the upper surface of the document D. . The reverse rotation separating roller 26 is pressed against the forward rotation separating roller 25 with a constant pressing force from below. Pickup roller 24 and forward rotation roller 25
Is driven to rotate in the direction of arrow c by the paper feed motor 32,
The reverse rotation separating roller 26 is moved by an arrow c by the feed motor 32.
It is driven to rotate in the r direction.

The registration rollers 28 and 29 temporarily hold the fed document at the nip portion thereof, and after a predetermined time, rotate the upper roller 28 in the direction of arrow c by the main motor 45 to move the document to the platen glass 2. Transport to the entrance. The lower roller 29 rotates following the upper roller 28. The transport belt 41 is stretched endlessly between a drive roller 42 and a driven roller 43 so as to cover the entire surface of the platen glass 2. Inside the conveyor belt 41,
In order to press the belt 41 against the platen glass 2, a number of backup rollers 44 are rotatably provided. The conveyor belt 41 is driven to rotate in the direction of arrow c by a main motor 45 via a driving roller 42, and moves the original to a reference position O, which is a boundary between the scale 3 and the platen glass 2.
And set the original with the rear edge.

The reversing / discharging section 90 includes a pinch roller 92
a, 92b, reverse roller 91, paper feed switching claw 9
3, a discharge roller 94 and a discharge tray 95. The reversing roller 91 and the discharging roller 94 are driven to rotate in the direction of arrow c by a reversing / discharging motor 96, and
Reference numeral 3 is operated by a solenoid (not shown). At the time of the first-side copy processing of the two-sided document, the reversing roller 91 and the switching claw 93 perform an operation for reversing the document. That is, the document that is being discharged from the platen glass 2 by the rotation of the transport belt 41 is rotated and conveyed around the reversing roller 91, and is returned to the platen glass 2 again in an inverted state. At this time, the transport belt 41 is driven to rotate in the direction opposite to the arrow c. Switching claw 93 in discharge mode
The document is discharged from the reversing roller 91 to the tray 95 through the discharge roller 94 without operating.

Next, with reference to FIGS. 3 to 5, a description will be given of a structure for mounting the ADF 10 to the copying machine main body 1 having the above-described configuration and operation, and a structure for supporting the transport unit 40. ADF1
Numeral 0 indicates that the platen glass 2 can be opened by the hinge fitting 5 provided on the back side so that the conveyor belt 41 is located on the platen glass 2 so as to be positioned on the platen glass 2.
When an operator manually sets an original on the platen glass 2, the operation is performed by lifting the entire ADF 10 upward. At this time, the ADF 10 moves up and down about the support shaft 6 of the hinge fitting 5 as a fulcrum.

A magnet 12 is fixed to the front frame 51F of the ADF 10, and the magnet 1 is mounted on the copying machine main body 1.
The magnetic plate 4 is provided at a position facing the magnetic plate 2. ADF
When the magnet 10 is closed from the open state, the magnet 12
Attracts the magnetic plate 4 and the setting is assured. Further, one magnet 12 has a built-in reed switch. This reed switch operates when the magnet 12 attracts the magnetic plate 4 and the device 10
Detects that it has been set correctly.

The hinge metal fitting 5 has a fixed metal fitting 5a fixed on the copying machine main body 1, and the movable metal fitting 5b is provided with two hinge stays 50 extending to the near side. The hinge stays 50 include frames 51F, 51R of the transport unit 40.
Are held by stepped screws 52 and 53. Therefore, the transporting section 40 moves the hinge stay 50 to A or A ′.
Has the degree of freedom to move in the vertical direction by the clearance. In addition, the ADF is provided below the frame bodies 51F and 51R.
Spencers 54 and 55 that abut on the platen glass 2 when 10 is closed are attached.

When the transport section 40 is in the open state, it is suspended from the hinge stay 50 by its own weight.
When the ADF 10 is completely closed (see FIG. 5B), the magnet 12 is in a state where the magnetic plate 4 is attracted. In this state, the spacers 54 and 55 are grounded on the platen glass 2, and the surface of the transport belt 41 is placed parallel to the platen glass 2 at a certain height.

Here, as shown in FIG. 7, a mechanism for preventing the movement of the contact point P ₁ which occurs when the operator manually sets the original on the platen glass 2 will be described with reference to FIGS.
This will be described with reference to FIG. The stepped screws 52 and 53 are inserted into holes 50 a and 50 b of the hinge stay 50. The holes 50a and 50b are elongated holes in the front-rear direction.
2, 53 are slidable in the front-rear direction within the range of the long holes 50a, 50b. On the other hand, the lever 61 connects between the support shaft 6 of the hinge fitting 5 and the pin 60 fixed to the rear frame 51R.

In the above configuration, when the ADF 10 is closed with respect to the platen glass 2, as shown in FIG. 5A, the inner edge of the conveyor belt 41 first contacts the platen glass 2 (contact point). P ₁ ). Conveyor belt 41
Rotates further downward until it is completely closed, and attempts to move to the back side as in the conventional example.
Because it is attached to the hinge pivot 6 by 1, is prevented from moving to the rear side, while the contact point P ₁ is stationary at a point on the platen glass 2, ADF 10 has a platen glass 2
Is completely closed [see FIG. 5 (b)]. The stepped screws 52, 53 move toward the near side in the long holes 50a, 50b of the hinge stay 50 by the amount by which the movement of the conveyor belt 41 to the back side together with the frames 51F, 51R is prevented. Therefore, the document is placed on the platen glass 2, a document is no problem that ends up moving to the back side of the edge of the conveyor belt 41 is in contact with the document at the point P _1.

The pin 60 which supports the lever 61 is preferably arranged in a line on or near the line connecting the hinge pivot 6 and the contact point P _1. By using the system in which the transport unit 40 is suspended from the hinge stay 50, even if a component error or assembling error of the hinge fitting 5 occurs or the platen glass 2 is slightly inclined, the frame body 51 can be used.
Is moved up and down within the clearances A and A ′ of the stepped screws 52 and 53, so that the transport unit 40 naturally adjusts to the surface of the platen glass 2. Conventionally, the height of the platen glass 2 was adjusted for each machine by interposing a spacer between the hinge fitting 5 and the mounting surface of the copying machine body when setting up the machine, but such fine adjustment is required. Is gone.

In this embodiment, the transport unit 40 is of a hanging type, and a hinge member 5 is provided with a spring member (not shown).
The rear side of the ADF 10 is biased upward by a spring. That is, A
Heavy objects such as the motors 32, 45, and 96 are disposed on the back side of the DF 10, and the weight balance is considerably deviated to the back side. Therefore, the balance of the weight is corrected by a spring member. Therefore, the ADF 10 is in the middle of the opening / closing operation.
10 comes to rest in a range in which the weight of 10 and the spring biasing force are balanced. When the spacer 55 comes into contact with the platen glass 2 immediately before the ADF 10 closes, a part of the weight of the ADF 10 is supported by the platen glass 2, and the balance between the weight of the ADF 10 and the spring biasing force is lost. With this, the spacer 5
There is a possibility that the ADF 10 comes to rest between the time when the ADF 10 comes into contact with the platen glass 2 and the time when the ADF 10 is completely closed. At this time, switches for detecting opening and closing of the ADF 10 may erroneously detect that the ADF 10 is set correctly. The magnet 12 and the magnetic plate 4 (see FIG. 3) with the built-in reed switch prevent such a problem. That is, the reed switch operates only when the magnet 12 attracts the magnetic plate 4, and detects that the ADF 10 is completely closed. [Second embodiment, see FIG. 6] The second embodiment also relates to the present invention.
This is applied to DF. While the first embodiment employs a configuration in which the transport mechanism 40 is prevented from moving to the far side by a link mechanism, the second embodiment employs a stepped screw 5
The movement to the back side is prevented by 3 '.

That is, the stepped screw 53 'is connected to the rear frame 51R.
And is slidably inserted into a hole 63 a of a guide block 63 fixed to the upper surface of the hinge stay 50 at an angle θ. Hole 6
3a guides the stepped screw 53 ′ so that the angle θ does not change. Accordingly, when the ADF 10 is closed with respect to the platen glass 2, the stepped screw 53 ′ is guided by the hole 63 a of the guide block 63 and moves slightly upward after the transport unit 40 comes into contact with the platen glass 2. When the angle θ is kept constant, A
The DF 10 moves slightly forward with respect to the hinge stay 50. This movement cancels the movement of the point P ₁ where the inner edge of the transport belt 41 first contacts the platen glass 2 to move to the inner side, and as a result, the contact point P
₁ keeps the ADF 10 stationary at one point until it is completely closed.

The other structure of the ADF 10 is the same as that of the first embodiment. [Other Embodiments] The document pressing apparatus according to the present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the gist. In particular, the present invention can be applied not only to the ADF, but also to the cover 11 as shown in FIG.
The present invention can also be applied to an original pressing device having a zero and an original pressing plate 111.

Further, even when applied to the ADF,
The basic configuration of the ADF is arbitrary.
0 and the transport unit 40 may be divided, the transport unit 40 may be hinged, and the transport unit 40 may be openable to the copier body 1.

[0021]

As is apparent from the above description, according to the present invention, when the document pressing member closes the platen glass, the first contact point of the document pressing member with the platen glass is completely closed. Since means for preventing movement is provided on the back side between the two, the displacement of the set position of the document by the document pressing member can be reliably prevented.

[Brief description of the drawings]

FIGS. 1 to 5 show a first embodiment of a document pressing apparatus according to the present invention, in which the present invention is applied to an ADF.

FIG. 1 is a schematic configuration diagram of an ADF.

FIG. 2 is a plan view showing the internal configuration of the ADF.

FIG. 3 is a perspective view showing a state in which the ADF is lifted from a copying machine main body.

FIG. 4 is a perspective view showing a hinge mechanism of the ADF.

FIG. 5 is an explanatory diagram showing when the ADF is opened and closed.

FIG. 6 is an explanatory diagram showing when an ADF is opened and closed according to a second embodiment to which the original pressing device according to the present invention is applied.

FIG. 7 is an explanatory diagram showing the state of opening and closing a conventional document pressing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Copier main body 2 ... Platen glass 5 ... Hinge bracket 6 ... Hinge support shaft 10 ... ADF (automatic document feeder) 20 ... Sheet feeder 40 ... Transporter 41 ... Conveyer belt (document pressing member) 50 ... Hinge stay 51F , 51R ... frame body 52, 53, 53 '... stepped screw 60 ... pin 61 ... lever 63 ... guide block 64 ... bracket

Continued on the front page (72) Inventor Yusuke Morikami 2-3-13-1 Azuchicho, Chuo-ku, Osaka-shi, Osaka Inside Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Takuma Ishikawa, Azuchi-cho, Chuo-ku, Osaka-shi, Osaka No.3-13 Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Hirokazu Matsuo 2-3-1-13 Azuchicho, Chuo-ku, Osaka City, Osaka Prefecture Osaka International Building Minolta Camera Co., Ltd. (56) Reference 1984-59,843 (JP, U) Actually open sho-59-123855 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 27/62

Claims (5)

(57) [Claims] 1. A document holding device rotatably supported by hinge means on the inner side of a copying machine main body and having a document holding member for pressing a document placed on a platen glass, wherein the hinge means has a fixed side. Movable part rotatably provided on member
It can move up and down in a substantially parallel state at a predetermined interval to the material,
In addition, it is almost horizontal at predetermined intervals in the back and front directions
When closing the document holding member movably suspended in the state and the document holding member with respect to the platen glass, the first contact point of the document holding member with the platen glass is completely closed. A document holding device , comprising: a movement preventing means for preventing movement to the back side. 2. The document holding member includes a plurality of rollers.
The belt is held in an endless shape.
Item 2. The document pressing device according to Item 1. 3. The moving means according to claim 1, wherein said movement preventing means is fixed to a hinge means.
Retaining the pivot for the side member and the movable member and the document pressing member
Claim: A lever provided between the member and the member.
3. The document pressing device according to claim 1 or 2. 4. The apparatus according to claim 1, wherein said movement preventing means comprises a movable member and a document pressing member.
That the shaft member is provided between the holding member and the holding member.
3. The document holding device according to claim 1, wherein
Place. 5. The movable member according to claim 1 , wherein said hinge means is movable.
It consists of side members and stays
Claim 1, Claim 2, Claim 3, or Claim characterized by the following.
Item 4. The document pressing device according to Item 4.