JPH07184009A - Floating preventing device for document press-contacting plate - Google Patents

Abstract

PURPOSE:To provide the device which prevents floating of a second part at the time of opening the document press-containing plate consisting of a first part and the second part. CONSTITUTION:A document press-containing plate A consists of a first part 3, which presses a document 10 on an original platen glass 2, and a second part 5 which has the free end connected to the base part of the first part 3 by a hinge and has the base part connected to the original platen glass 2 by a hinge. A sucker 8 is provided between the second part 5 and the original platen glass 2. When the first part 3 is turned from a contact part 14 of the second part 5 to the document pressing position, the air chamber of the sucker 8 is connected to the air; and when the first part 3 is opened to the contact part of the second part 5, the sucker 8 restores the suction function and sticks to the original platen glass 2, thus preventing the original platen glass 2 from floating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus used in a copying machine, a facsimile, a printer, etc.
More specifically, the present invention relates to a document crimping device for crimping a document on a document table glass of an image reading device.

[0002]

2. Description of the Related Art Conventionally, a document pressure-bonding device includes a first portion for pressure-bonding a document onto a document platen glass of an image reading device, and a first portion.
One part of the sheet original is hinged and the other end is hinged to the main body of the image reading apparatus. The sheet original has the first portion and the second portion horizontal to the original glass, and For thick originals such as books, the first part is pressure-bonded to the platen glass and the second part is tilted. For example, it is known from Japanese Utility Model Publication No. 64-4108. In order to prevent the image reading apparatus from falling down in the opened state, a hook-shaped locking portion is provided on the main body of the image reading device, and an engaging portion that engages with the hook-shaped locking portion when the first portion is opened by 90 ° or more is provided. It is formed on one end of the first portion on the hinge coupling side, and prevents the first portion from collapsing with the second portion when opened by 90 ° or more.

This is the second part when the first part of the crimping device is opened.
This is because when the part floats, the sense of moderation is lost and the operability deteriorates.

[0004]

However, in the above-mentioned conventional example, the hook-shaped locking portion is provided in the main body of the image reading apparatus and the engagement is engaged with the hook-shaped locking portion when the first portion is opened by 90 ° or more. Since the portion is formed at one end of the first portion on the hinge coupling side to prevent the first portion from collapsing together with the second portion when the first portion is opened by 90 ° or more, there are the following drawbacks.

(1) When an excessive force is applied in the opening direction of the first portion with the first portion opened at a predetermined angle of 90 ° or more, the hook-shaped engaging portion of the image reading apparatus main body and the first portion Since the force concentrates on the joint portion formed at one end on the hinge joint side of the portion, damage is likely to occur.

(2) Since a hook-shaped engaging portion is attached to the main body of the image reading apparatus, a protrusion is formed on the same surface as the platen glass, and when a document larger than the platen glass is read, the original is hooked. If the original is lifted or scratched on the stopper, it will be difficult for the original to adhere to the original glass.

According to the present invention, when the original pressure plate is opened, a locking portion is not provided and the second portion is prevented from rising so that the operability of the original when the pressure plate is opened is improved. It is an object of the present invention to provide a lifting prevention device.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a first method for pressing a document (10, 15) onto a document mounting table (2) of a reading apparatus main body (1).
A portion (3) and a second portion (5) in which one end of the first portion (3) is rotatably connected and the other end is rotatably connected to the document placing table (2). , And when the first portion (3) is opened to a specific angle of 90 ° or more, the first portion (3) and the second portion (5) are brought into contact with each other and the first portion (3 ) Is regulated, and in the regulated state, the original pressure plate (A) in which the open state is held by the self-weight of the first part (3), between the reading device body (1) and the second part (5). By providing the suction cup (8), rotation of the second portion (5) is restricted when the first portion (3) contacts the second portion (5), and the first portion (3) presses the original document. The air chamber of the suction cup (8) is communicated with the atmosphere in conjunction with the operation of closing the position.

[0009]

According to the above construction, the suction cup (8) between the second portion (5) of the original pressure plate (A) and the reading apparatus main body (1) is provided in the second portion (5). As a result, when the first portion (3) comes into contact with the second portion (5), the second portion (5)
The rotation of the second part (5) can be restricted, and the careless lifting of the second part (5) is prevented.

Further, the first portion (3) is replaced with the second portion (5).
When the original contact position is closed to the document pressing position, the air chamber of the suction cup (8) is communicated with the atmosphere in conjunction with the closing operation of the first portion (3), whereby the second portion (5) is closed. It is possible to freely rotate.

The reference numerals in parentheses are shown for reference to the drawings and do not limit the structure of the present invention in any way.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, a document table glass (document table) as a document table of the image reading apparatus main body 1 in FIG.
The first portion 3 of the original pressure plate A to be pressure-bonded to
Is connected to the second portion 5 of the original pressing plate, and the second portion 5 is connected to the image reading apparatus main body 1 by the hinge portion 6.

The first portion 3 is for placing the original 10 on the original table glass 2
A crimping sheet 7 is provided for crimping to. Also, the second
The portion 5 includes a suction cup 8 and faces the upper surface of the cover 13 of the main body 1. The upper part of the suction cup 8 is hollow,
The tip portion 9 of the second portion 5 slightly protrudes from the slope 11 of the second portion 5. A contact portion 12 with the cover 13 is provided at the tip of the second portion 5.

FIG. 1 is a view in which an original 10 on a sheet is pressure-bonded, and when the first portion 3 fits the original table glass 2, the contact portion 12 of the second portion 5 is removed from the cover 13. They are separated from each other, and the accurate pressure bonding of the document 10 on the document pressure plate A is guaranteed. At this time, since the tip 9 of the suction cup 8 is open, it does not function as a suction cup. Further, at this time, it is not necessary that the suction cup 8 is in contact with the cover 13.

FIG. 2 shows a state in which the first portion 8 of the original cover A is opened, and the first portion 3 and the second portion 5 are opened.
It abuts against the contact portion 14 provided at one end of the and stands in an open state. Since this state is stable, when the first portion 3 is slowly opened, it is not necessary to prevent the second portion 5 from rotating, but when the first portion 3 is opened vigorously, the first portion 3 becomes the second portion 5.
Immediately after coming into contact with the contact portion 14, the force that tries to rotate the whole works and the second portion tries to float. The same applies when the original pressure plate A is further pressed after opening.

At this time, the contact portion 12 of the second portion 5 is in contact with the cover 13, the suction cup 8 is in full contact with the cover 13, and the tip portion 9 of the suction cup 8 is also blocked by the first portion 3. , The suction cup 8 regains its function and the second part 5
To prevent the rising of.

When the original pressure plate A becomes stable,
The inside of the suction cup 8 may be the same as the atmospheric pressure, but a mechanism for preventing the second portion 5 from rising is that negative pressure is generated by the operation of rising.

Further, since it is only necessary to prevent the second portion 5 from being lifted up, it is not necessary to maintain the suction force, and the cover 13
The surface property of may be roughened due to graininess or the like.

FIG. 3 is a view when an excessive force (force greater than a predetermined value) is applied in the opening direction of the first portion 3, and because of the force exceeding the holding force of the suction cup 8, the suction cup 8 and the cover 13 The original pressing plate A is tilted rearward.

FIG. 4 is a diagram showing a case where a thick original 15 such as a book is pressed onto the original glass 2 and the second original 5 is lifted to allow the thick original 15 on the first portion 3 to be pressed. I have to. Since the first portion 3 rotates and comes into contact with the original 15 and the second portion 5 starts to float, the suction cup 8 loses its suction force at this time because the tip 9 is open at this time,
It does not hinder the rotation of the part 5.

In this embodiment, the suction cup 8 is sucked by the cover 13, but the other party may be the original platen glass 2, for example. <Second Embodiment> FIG. 5 is a view showing a second embodiment of the present invention, in which a part of the second portion 5 is enlarged.

In this embodiment, the suction cup 8 is fitted in the holder 17 fixed to the second portion 5, and the holder 17
An actuator 16 is attached to the shaft 16 so as to be rotatable about a shaft 16a.

The actuator 16 is integrally provided with a spring portion 18, which comes into contact with the bottom surface 20 of the holder 17 and has a slight space from the tip portion 9 of the suction cup 8. Other configurations are the same as those in FIG. Here, although not shown, when the first portion 3 is opened, the tip 19 of the actuator 16 is pushed by the first portion 3 and is moved in the direction of arrow A, so that the spring portion 18 bends in the direction of arrow B and the suction cup is sucked. The tip 9 of 8 is pressed to close the opening and the suction cup 8 restores its function.

In the first and second embodiments, the holes of the suction cup 8 are closed, but a suction cup without a hole is used, and a part of the suction surface of the suction cup is used except when the first portion 3 is opened. Of course, a configuration in which the function as a suction cup is removed by flipping over is also included in the configuration of the present invention.

[0026]

As described above, in the original pressure plate of the present invention, since the suction cup is provided between the second portion and the cover of the reading apparatus main body, when the first portion comes into contact with the second portion, By controlling the rotation of the two parts, it is possible to prevent the second part from being inadvertently prevented from floating and to improve the operability.

Moreover, the air chamber of the suction cup is made to communicate with the atmosphere in conjunction with the operation of closing the first portion, so that the second portion is allowed to freely rotate during the document pressure-bonding operation.
Further, since there is no locking portion between the original pressure plate and the reading apparatus main body, an unnecessary force is not applied to the original pressure plate,
It does not damage the manuscript.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a closed state of a document pressure plate according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a state in which the first portion of the original pressure plate is also opened.

FIG. 3 is a vertical cross-sectional side view showing a state in which the entire original pressure plate is also collapsed.

FIG. 4 is a vertical cross-sectional side view of a document pressure plate that also presses a thick document.

FIG. 5 is a vertical sectional side view of a document pressure plate according to a second embodiment of the present invention.

[Explanation of symbols]

 1 image reading device main body 2 original platen glass (original platen) 3 first part of original pressure plate 5 second part of original press plate 7 crimping sheet 8 sucker 9 tip of sucker 10 sheet original 13 cover of device main body 14 Contact part 15 Thick manuscript 16 Actuator 17 Holder 18 Actuator spring part 19 Actuator tip 20 Holder seat surface

Claims (1)

[Claims] 1. A first portion for pressing a document on a document mounting table of a main body of a reading device, and one end of the first portion is rotatably connected, and the other end is rotatable on the document mounting table. And a second portion connected to each other, and when the first portion is opened at a specific angle of 90 ° or more, the first portion and the second portion contact each other to rotate the first portion. In the original pressure plate that is regulated and the open state is maintained by the weight of the first portion in this regulated state, by providing a suction cup between the reading device main body and the second portion, the first portion abuts against the second portion. An apparatus for preventing floating of a document pressure plate, characterized in that the rotation of the second part is restricted at the same time, and the air chamber of the suction cup communicates with the atmosphere in conjunction with the operation of closing the first part to the document pressing position.