JPS62240949A - Original document pressing device - Google Patents

Abstract

PURPOSE:To prevent the movement of an original document placed on an original platen, by a simple structure, by providing a pressing plate for pressing a part of the original document, on a sliding member which can slide in the opening and closing directions of an original cover. CONSTITUTION:The pressing plate 12 is attached to the side end part of an original platen 3 of a sliding shaft 10. When the original cover 2 contacts the original document 15 of a pressing sheet 12a that a pressure plate 12 has, the sliding shaft 10 and the pressure plate 12 are restricted as to its movement in the direction as indicated with an arrow B. When the original cover 2 is continuously moved in the direction as indicated with the arrow B, the sliding shaft 10 moves relatively in the direction as indicated with an arrow A against a fixed part 4 fixed to the original cover 2, and while the original cover 2 is moving to the closed position of a state 2'', the pressure sheet 12a continues to press the side end part of the reference plate 14 of the original document 15 against the original platen 3. In this way, when the original cover 2 is moved in the direction as indicated with the arrow B, it can be prevented that the original document moves due to a wind pressure generated between said cover and the original platen 3.

Description

[Detailed Description of the Invention] Technical Field> The present invention provides a method in which the placement position of a document placed on a document table is
The present invention relates to a document pressing device that prevents changes due to opening and closing of a document cover or movement of a document table.

<Summary of the Invention> In summary, the document pressing device according to the present invention has a pressing plate that presses a part of the document on a sliding member that is slidable in the opening/closing direction of the document cover. This is a simple structure that can prevent the document placed on top from moving.

<Prior art and its disadvantages> In a copying machine using electrophotography, a scanner scans an image of a document placed on a document table, and the image of the document illuminated by a light source of the scanner is transferred to the surface of a photoreceptor. An image is also formed in a range corresponding to this portion.

Furthermore, if the document is not in close contact with the document table, a shadow will be formed on the image of the document, resulting in poor image formation. Furthermore, in order to accurately reproduce the image of the original on paper, the original must be correctly positioned on the original table. As mentioned above, in order to prevent leakage of light from the light source, maintain close contact between the original and the document table, and position the document on the document table, copying machines are equipped with document covers that have white on the side that presses the document. is provided. However, when the document cover is opened and closed, the document may move due to wind pressure generated near the document table, and in particular, in copying machines with a movable document table, the document may be misaligned due to movement of the document table.

For this reason, conventionally, for example, in the document disclosed in Japanese Utility Model Application Publication No. 60-26049, a part of the document was sandwiched between the document table and a presser plate that was provided on the document table so that it could be taken in and out. . However, when exchanging originals, the original must be put in and taken out from under the presser plate, which makes the work complicated and there is a risk of damaging the original.

Further, in the apparatus disclosed in Japanese Utility Model Application Publication No. 59-15043, a document fixing device is provided near the document table on the top surface of the copying machine. However, since this document fixing device is exposed on the plane of the document table regardless of whether it is used or not, it has the disadvantage that it may damage the document when copying with a portion of the document protruding from the document table.

Furthermore, the device disclosed in Japanese Utility Model Application Publication No. 59-186844 has a presser plate that can be opened and closed using the same hinge as the original cover, but this has the drawback of increasing the size of the mechanism and increasing costs. .

<Object of the Invention> In view of the above-mentioned drawbacks of the conventional art, the object of the present invention is to provide the document cover with a pressing member that moves in the direction of opening and closing.
To provide a document pressing device that prevents a document from being misaligned due to opening/closing a document cover or moving a document table without requiring any operation by an operator, and prevents damage to the document by configuring a flat surface of the document table to be smooth. be.

<Structure and Effects of the Invention> The document pressing device of the present invention includes a document cover that can be opened and closed using one end as a fulcrum on the top surface of the document table, and a part of the document placed on the document table in the direction of the document table. In a document pressing device comprising a pressing plate for pressing, a sliding member that is slidable in the opening/closing direction within a range smaller than the opening/closing range of the document cover is provided on the document cover, and the document platen side of the sliding member is provided. It is characterized by a pressure plate attached to the end.

According to the present invention with the above configuration, after a document is placed on the document table with the document cover fully opened, when the document cover is closed to a certain angle, the pressing member comes into contact with the document. Thereafter, when the document cover is further closed, the sliding member provided with the pressing plate slides against the document cover. As a result, the document cover can be completely closed while the document is pressed by the pressing plate. Further, when the document cover is opened from a completely closed state, the sliding member slides against the document cover up to a certain angle. During this time, the pressing plate remains in contact with the document. Further, when the document cover is opened beyond the slidable range of the sliding member, the sliding member cannot slide against the document cover, and moves in the opening direction together with the document cover. As a result, the pressing plate is released from contact with the original, and the original can be replaced.

In this way, since the pressing plate is attached to the document cover via the sliding member, the pressing of the document by the pressing plate and its release can be performed by opening and closing the document cover.
There is no need for an operation related only to fixing the document. Furthermore, since it is composed of a sliding member and a pressing plate, the structure is simple and does not result in a large increase in cost. Furthermore, in order to provide the document cover with a member related to fixing the document,
The plane of the document table can be configured to be smooth. Therefore, according to the document pressing device of the present invention, the complicated work related to fixing the document is eliminated, cost increases are suppressed, damage to the document is prevented, and the document is reliably positioned on the document table. be able to.

<Embodiment> FIG. 1 is a side view of a document pressing device according to an embodiment of the present invention, which is installed in a copying machine.

A document table 3 formed on the top surface of the copying machine main body 1 is connected to a rail 6.
And the guide 7 reciprocates in a direction perpendicular to the drawing. A document cover 2 is provided on the document table 3 so as to be openable and closable in the direction of arrow A or B using a hinge 5 as a fulcrum.

A sliding shaft 1 is attached to one end of the document cover 2 via a fixed part 4.
0 is attached. The sliding shaft 10 is slidable relative to the fixed part 4 in the direction of arrow A or B. A pressing plate 12 is attached to the end of the sliding shaft 10 on the side of the document table 3. The sliding range of the sliding shaft 10 relative to the document cover 2 is restricted by its length.

FIG. 2 is a front sectional view of the document pressing device.

A holder 4a is formed in the fixed part 4. The end of the document cover 2 is inserted into this holder 4a, and the fixing portion 4 is fixed to the document cover 2. A cushioning material 2a is provided on the document pressing surface of the document cover 2. The area of the cushioning material 2a is smaller than the area of the document cover 2, and the area of the buffer material 2a is smaller than that of the document cover 2.
There is no cushioning material 2a near the end. A hole 4b is formed in the fixing part 4 in the vertical direction. A sliding shaft 10 is inserted into this hole 4b. A stopper 16 is formed at the upper end of the sliding shaft 10 to restrict movement in the direction of arrow B. In addition, a pressing plate 12 is provided at the lower end of the sliding shaft lO.
is formed. A rotating plate 12b is attached to the pressing plate 12 so as to be rotatable in the direction of arrow C or D about the fulcrum 11. A pressing sheet 12a is fixed to the end of the three document tables of the rotary plate 12b. This pressing sheet 12a is formed into a flat plate shape from a flexible elastic material. The rotating plate 12b is made of a magnetic material and has a flat plate shape. In addition, on the bottom of the pressing plate 12, there is a magneto
a is attached, and the rotating plate 12b is fixed by the magnetic force of this magnet 13a.

On the other hand, a magnet 13b is also attached to the outer surface of the fixed part 4, and after the pressing plate 12 is positioned as shown by the two-dot chain line in the figure, the rotating plate 12b can be fixed by the magnetic force of the magnet 13b. .

According to this embodiment with the above configuration, when placing a document on the document table 3, the document cover 2 is opened to the state 2' shown by the two-dot chain line in FIG. At this time, the sliding shaft 10 and the pressing plate I2 are located in shapes B10' and 12', respectively, shown by the two-dot chain lines in FIG. 1 due to the contact between the stopper 16 and the fixed part 4. Therefore, the upper surface of document table 3 is open. In this state, the original 15 is set using the reference plate 14 as a reference.

After the document is placed, the document cover 2 is moved in the direction of arrow B to cover the document table 3. Movement in the direction of arrow B progresses,
When the document cover 2 is positioned as shown by the solid line in FIG.
A pressing sheet 12 a of the pressing plate 12 contacts the original 15 . Therefore, the sliding shaft 10 and the pressing plate 12 are
Directional movement is restricted.

When the document cover 2 is subsequently moved in the direction of arrow B,
The sliding shaft 10 moves in the direction of arrow A relative to the fixed part 4 fixed to the document cover 2.

Therefore, while the document cover 2 moves from the state shown by the solid line in FIG.
Continue to press the 4th side edge against the document table 3.

This prevents the document handler 5 from moving due to wind pressure generated between the document cover 2 and the document table 3 when the document cover 2 is moved in the direction of arrow B. In addition, since the pressing sheet 12a continues to press the original 15 even when the original cover 2 is completely closed, the position of the original does not occur due to movement of the original table in a copying machine with a moving original table. . Furthermore, for the same reason, during copying work,
Since it is possible to maintain good adhesion between the document platen 3 and the document table 3,
The image formation condition does not deteriorate.

Moreover, the pressing sheet 12a is opened and closed by the opening and closing operation of the document cover 2.
Therefore, it is not necessary to perform operations related to only pressing the document. Furthermore, since its structure is extremely simple, it does not require a cost increase, and since it is detachable, it can be installed as an option in a copying machine.

Furthermore, by magnetically attracting the rotary plate 12b to the magnet 13b of the fixed part, the movement of the sliding plate 10 relative to the fixed part 4' can be regulated, so the movement can be stopped when pressing the document is not required. , can facilitate copying work. Along with this, the fixed part 4. Since the document pressing device consisting of the sliding shaft 10 and the pressing plate 12 is attached to the document cover 2, the top of the document table 3 can be configured smoothly and the document will not be damaged.

[Brief explanation of drawings]

FIG. 1 is a side view showing the mounting state and operation of a document pressing device according to an embodiment of the present invention, and FIG. 2 is a front sectional view showing the structure of the document pressing device. 2-document cover, 3-document table, 10-sliding shaft, 12-pressing plate, 12a-pressing sheet.

Claims (1)

[Claims] (1) A document pressing device comprising a document cover that can be opened and closed using one end as a fulcrum on the top surface of the document table, and a pressing plate that presses a part of the document placed on the document table toward the document table. A document pressing device comprising: a document cover provided with a sliding member that is slidable in the opening/closing direction within an opening/closing range smaller than the opening/closing range of the document cover; and a pressing plate attached to an end of the sliding member on the document table side. .