JPH0721460Y2 - Automatic document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an automatic document feeder applied to an image processing machine such as an electrostatic copying machine or an image reader.

[Conventional technology]

2. Description of the Related Art In recent years, in image processing machines such as electrostatic copying machines, those equipped with an automatic document feeder (ADF) that automatically conveys a document on a contact glass have become popular. As this automatic document feeder, for example, the one disclosed in JP-A-60-118551 can be exemplified.

This document feeding device is configured to feed a document placed on a document table, transporting the document fed from the feeding unit to a predetermined position on a contact glass, and feeding the document. The means has an ejecting portion provided on the opposite side of the contact glass, and the original fed by the feeding means is conveyed by the conveying means onto the contact glass, and after the copying process, conveyed again in the same direction. It is configured to be sent to the discharge unit.

However, since this document feeder is provided with the feeding means and the discharging section with the contact glass sandwiched therebetween, the conveying means becomes large so as to cover almost the entire surface of the contact glass, and is not applicable to a small copying machine or the like. There was a problem that it was difficult.

[Problems to be solved by the device]

Therefore, in order to solve these problems, an automatic document feeder which is applied to an image processing machine in which a transparent plate on which a document is placed is provided on the upper surface of a housing is provided on one edge of the transparent plate. An opening / closing frame that is mounted on the housing so as to be pivotable between a closed position that covers the transparent plate and an open position that exposes the transparent plate around a pivot axis that extends along the opening and closing frame. Conveying roller means that is rotatably mounted and is brought into close contact with the transparent plate when the opening / closing frame is closed, and the opening / closing frame is installed in the closing position. An original pressing plate that is opposed to the transparent plate at a predetermined interval when pressed, an original table on which an original is placed, and the originals placed on the original table are sequentially transferred to the transparent plate. And a document sending means for sending the document toward , Document sent by the document delivery means is made to carry between the platen cover and the contact glass by the conveying roller unit, after the image processing,
The present applicant has previously proposed an automatic document feeder which discharges a document by being reversely conveyed by the conveying roller means. (Japanese Patent Laid-Open No. 1-236126) However, the previously proposed automatic document feeder is
Although major improvements have been made in terms of simplification of the mechanism and reduction of cost, there are other points to be improved. For example, the points are as follows.

In the above-mentioned automatic document feeder, the document pressing plate provided on the opening / closing moving frame body covers almost the entire surface of the contact glass when the opening / closing moving frame body is set to the closed position, and a gap of about 1 mm is provided. The ribs are attached to the plurality of ribs hanging from the opening / closing frame so as to face each other with an adhesive or the like.

That is, when attempting to attach the document pressing plate to the frame of the automatic document feeder, the document pressing plate must be maintained at an interval of about 1 mm with respect to the contact glass, and the strength of the frame is maintained. It is necessary to supplement the distance from the upper plate of the frame to the contact glass. Therefore, the original pressing plate is made of a rigid plate made of resin or the like, and a plurality of ribs are hung from the upper plate of the opening / closing moving frame body so as to be close to the upper surface of the contact glass.
The original pressing plate is attached to the rib.

The lower part of the transport roller means on the side of the paper feed portion of the document pressing plate cannot support the rib because the transport roller means is provided and is in a state of being unsupported. Further, a cutout is provided in a portion of the document pressing plate below the roller means corresponding to each roller of the transport roller means.

Therefore, since the original pressing plate is attached to the rib as described above, the adhesive area is small and the original pressing plate is easily peeled off, and the lower part of the conveying roller means is not supported at all, so that it is adjacent to the lower part of the conveying roller means. Adjacent parts are more easily peeled off, and this tendency is remarkable at high temperature and high humidity. Then, when the adjacent portion of the document pressing plate on the side of the paper feed portion is peeled off and the lower portion of the transport roller means hangs down on the upper surface of the contact glass, the document fed from the paper feed portion is fed by the transport roller means of the document pressing plate. It collided with the lower part and damaged the document, which was a cause of conveyance failure.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an automatic document feeder which prevents the document pressing plate adhered to the opening / closing frame from being peeled off, thereby preventing document conveyance failure.

[Means for Solving the Problems]

To achieve the above object, the present invention provides an automatic document feeder applied to an image processing machine in which a transparent plate on which a document is placed is disposed on the upper surface of a housing, and one edge of the transparent plate is provided. An opening / closing frame that is mounted on the housing so as to be pivotable between a closed position that covers the transparent plate and an open position that exposes the transparent plate around a pivot axis extending along the Transport roller means that is rotatably mounted on the transparent plate and is brought into close contact with the transparent plate when the opening / closing frame is closed, and the opening / closing frame is mounted on the transparent plate. The original pressing plate that faces the transparent plate at a predetermined interval when it is pressed, the original table on which the original is placed, and the originals placed on the original table are transparent one by one. And a document feeding means for feeding toward the plate. A rib is provided on the opening / closing frame, and a supporting plate having a flat portion at the same height as the rib is provided on the side of the conveying roller means of the opening / closing frame, and the document holder is extended across the rib and the supporting plate. The present invention provides an automatic document feeder which is characterized in that plates are adhered.

[Action]

Since the adjacent portion of the original pressing plate adjacent to the lower portion of the conveying roller means is adhered to the flat portion of the supporting plate having a sufficient adhesion area, the adjacent portion is prevented from peeling off, and the conveying roller of the original pressing plate is prevented. The lower part of the means does not hang down.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a partial sectional view of the automatic document feeder of the present invention, FIG.
The figure is a schematic perspective view of the conveying section of the automatic document feeder of the present invention,
FIG. 3 is a schematic diagram showing the drive relationship from the paper feed section to the transport roller means.

Reference numeral 5 in the drawing denotes a paper feeding unit mounted on the main body of the copying machine (not shown),
A manuscript table 7 on which a manuscript is placed, a paper feed guide lower member 4 connected to the manuscript table 7 and guiding the manuscript to a contact glass (transparent plate) 22, and a manuscript feed path together with the paper feed guide lower member 4. It includes a paper feed guide upper member 6 forming a sheet and a document sending means 3 for sending the document to the contact glass 22.

The paper feed guide lower member 4 is provided so as to be inclined downward in the feeding direction, and its downstream end is provided so as to be close to the end surface of the contact glass and be inclined upward in the feeding direction.

Therefore, the document is smoothly fed along the paper feed guide lower member 4, and further at the downstream end thereof, the document is fed upward in the feeding direction, so that a guide member 28 described later is provided.
The document is reliably conveyed to the upper surface of the contact glass 22 against the downward biasing force of the document.

The document feeding means 3 is provided with a forward feed roller 16 provided above the document table 7, a paper feed roller 10 for further feeding the document fed from the forward feed roller 16, and the paper feed roller 10. The reversing roller 8 is provided so as to face each other and prevents double feeding of the originals, and the originals are sent one by one onto the contact glass 22.

In the drawing, reference numeral 50 denotes an opening / closing moving frame body whose one end is attached to the main body of the copying machine so as to be freely opened and closed.
The document sent from the contact glass 22 is carried into a predetermined position, and after the copy processing operation is completed, the carrying roller unit 20 carries the document out in the reverse direction, and the document placed by the carrying roller unit 20. A document pressing plate 30 for preventing floating, a guide member 28 for preventing the document conveyed in the opposite direction by the conveying roller means 20 from moving to the paper feed guide lower member 4 and deflecting it upward, and the guide member 28. It has a discharge guide 24 for guiding the document deflected upward by 28 to the frame upper portion 14.

The carrying roller means 20 is composed of a roller such as a sponge, and is driven forward and backward by a driving means (not shown) to carry in and carry out a document.

The transport roller means will be described in more detail with reference to FIG.
Reference numeral 20 denotes a central roller 21 having a relatively wide width and side rollers 23, 23 having a relatively narrow width provided on both sides thereof.
1 is fixed to a drive shaft 12 and is rotationally driven by a drive means (not shown). The one-side rollers 23, 23 are provided on a hollow cylindrical cantilever support member 2 extending laterally from the central roller 21, and the cantilever support member 2 has an inner diameter of 3 mm from the outer diameter of the drive shaft 12. It is about 4 mm in size and is in a cantilevered state with one end fixed to the central roller 21. The cantilever support member 2
The side rollers 23, 23 are provided at the other end of the.

Further, compared to the outer diameter of the central roller 21, the side roller
Since the outer diameter of 23 is slightly larger, the opening and closing frame
When 50 is brought to the closed position, the side roller 23 is swung upward and the cantilever support member 2 having a hollow cylindrical shape is bent, so that the side roller 23 is pressed against the contact glass surface with a predetermined pressing force.

The document pressing plate 30 is a white plate made of a rigid material such as resin and covers almost the entire surface of the contact glass when the opening / closing frame 50 is in the open position and faces each other with a gap of about 1 mm. Is attached to a plurality of ribs hanging from the opening / closing moving frame body 50 with an adhesive or the like.

That is, when the original pressing plate 30 is to be attached to the frame of the automatic document feeder, the original pressing plate 30 must be maintained at a distance of about 1 mm from the contact glass, and the strength of the frame is maintained. Together with the ribs 31 from the top of the frame to supplement the distance from the top plate of the frame to the contact glass.
To bring the rib closer to the top surface of the contact glass,
The original holding plate 30 is attached to 31. The ribs 31 serve to increase the strength of the opening / closing moving frame body and can be integrally molded with the opening / closing moving frame body, which is advantageous in that the manufacturing is very easy and the manufacturing cost can be kept low. There is.

Further, as shown in FIG. 2, an end portion 30b of the document pressing plate 30 on the side of the sheet feeding portion is provided with a notch through which the central roller 21 and the side rollers 23, 23 project, which can be understood from FIGS. As described above, no rib can be hung on the lower portion 30b of the conveyance roller means provided with the notch 33, and no rib is supported.

In the figure, reference numeral 40 denotes a support plate having a U-shaped cross section that supports an adjacent portion 30a of the original pressing plate 30 adjacent to the lower portion 30b of the conveying roller means, and is composed of a rigid body such as a metal plate.

The support plate 40 is provided between the ribs and is attached to the opening / closing frame by screws 41. The surface of the flat surface portion 40a of the support plate 40 facing the contact glass 22 is provided at the same height as the plurality of ribs 31 hanging from the opening / closing moving frame body 50, and the flat surface portion 40a is provided with conveying roller means of the document pressing plate 30. The adjacent portion 30a adjacent to the lower portion 30b is adhered and supported by an adhesive or the like. The flat portion 40a of the support plate 40 has a comparatively wide bonding area for supporting the adjacent portion 30a of the document pressing plate 30 on the side of the sheet feeding portion, and the document pressing plate is securely attached to the adjacent portion 30a. It is possible to prevent the adhesive part of the product from peeling off.

In the above embodiment, the lower portion 30 of the conveying roller means of the document pressing plate is
The adjacent portion 30a of b is supported by one support plate 40, but may be configured by a plurality of support plates.

Further, as shown in FIG. 3, the conveyance roller means 20 provided on the opening / closing frame is driven by the driving means 60 provided on the paper feeding section 5 attached to the main body of the copying machine. 60
a, 50a, 50b), but since the opening / closing motion frame body 50 takes two positions, an open position and a closed position, the drive gear 60a on the side of the paper feed unit is moved downward in the drive connection. The driven gear 50a on the opening / closing frame side is arranged on the upper side.

Therefore, at the same time when the driving of the transport roller means is started (when the drive is transmitted from the drive gear 60a on the paper feed section side to the driven gear 50a on the open / close moving frame body side), a force of lifting the open / close moving frame body 50 is generated, and the transport roller is generated. The means 20 was also liable to be in a floating state for a moment, which was a cause of conveyance failure.

Since the support plate 40 is formed of a rigid body such as a metal plate, the frame is prevented from warping, and the force of pressing the open / close moving frame body 50 against the contact glass 22 surface is provided by the weight of the support plate. The force that acts when the roller means 20 is driven (the force that causes the frame body to float) acts to cancel it, and the above-mentioned inconvenience is prevented.

[Advantages of the Invention] According to the configuration of the present invention, since the supporting end surface of the document pressing plate on the sheet feeding portion side is bonded to the flat surface portion of the supporting plate having a sufficient bonding area, the supporting end surface is peeled off. Thus, the inconvenience of preventing conveyance and causing poor conveyance is eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic document feeder of the present invention, FIG. 2 is a schematic perspective view of a transport section of the automatic document feeder of the present invention, and FIG.
The figure is a schematic diagram showing the drive relationship from the paper feed unit to the transport rollers. 1 ... Supporting member, 20 ... Conveying roller means 22 ... Contact glass, 5 ... Paper feeding section 40 ... Conductive supporting plate material, 7 ... Original table 16 ... Forward feeding roller, 10 ... Paper feeding roller 50 …… Opening / closing frame, 30 …… Original plate

Claims (1)

[Scope of utility model registration request] 1. An automatic document feeder applied to an image processing machine in which a transparent plate on which a document is placed is provided on an upper surface of a housing, and a swivel axis extending along one edge of the transparent plate. An opening / closing frame that is mounted on the housing so as to be pivotable between a closed position that covers the transparent plate and an open position that exposes the transparent plate, and a rotatably mounted inside the opening and closing frame. Transport roller means that is brought into close contact with the transparent plate when the open / close moving frame body is brought to the closed position, and the transparent roller is attached to the open / close moving frame body when the open / close moving frame body is brought to the closed position. An original pressing plate that faces the plate at a predetermined interval, an original table on which the original is placed, and the originals placed on the original table are sequentially sent to the transparent plate one by one. And a document sending means for And a support plate having a flat portion at the same height as the rib is provided on the side of the opening / closing moving frame that is closer to the transport roller means, and the original pressing plate is bonded across the rib and the support plate. Automatic document feeder.