JPH02284134A - Press-contacting device of original - Google Patents

Abstract

PURPOSE:To prevent damage even if an excessive force is applied in the opening direction by regulating the turning angle of a first part by means of a striking/ abutting part provided on a second part, and fixing the second part and a device main body together by means of a magnet. CONSTITUTION:The first part 3 of an original press-contacting plate A is joined to the second part 5 by a hinge part 4, and the second part 5 is joined to the picture reading main body 1 by a hinge part 6. The second part 5 is provided with the magnet 8, and is attracted to the metal plate 9 of the main body 1 to be fixed to the main body 1. When being opened, the first part 3 strikes the abutting part 11 provided on one edge of the second part 5, and supports by itself while it is opened; and the second part 5 is fixed to the device main body 1 by the magnet 8 and the metal plate 9. When an excessive force is applied in the direction in which the first part 3 is opened, the magnet 8 is detached from the metal plate 9. Since the first part 3 can be kept self-supporting, damage is not caused even if an excessive force is applied.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image reading device used in a copying machine, a facsimile machine, a printer, etc., and more specifically to a document pressing device that presses a document onto the document table glass of the image reading device. It is related to.

[Prior Art] Conventionally, a document pressing device has a first portion that presses a document onto a document table glass of an image reading device, one end of which is hinged to the first portion, and the other end of which is connected to the main body of the image reading device. For sheet originals, the first and second parts are horizontal to the document table glass, and for thick documents such as books, the first part is horizontal to the document table glass.
A device that presses the document with the second part tilted is known, for example, from Utility Model Publication No. 64-4108, but these have a saw-shaped lock on the main body of the image reading device to prevent the document pressure bonding plate from falling when it is open. and an engaging portion that engages with the saw-shaped locking portion when the first portion is opened by 90° or more.
Formed at one end of the hinge joint side of the part, and at a 90° angle from the first part.
This prevents it from falling down together with the second part when opened.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, a bridge-shaped locking portion is provided on the main body of the image reading device, and an engaging portion that engages with the bridge-shaped locking portion when the first portion is opened by 90 degrees or more is provided as a first portion. It is formed at one end of the hinge joint side of the first part to prevent it from falling down together with the second part when the first part is opened more than 90 degrees.
It had the following drawbacks.

(1) If excessive force is applied in the opening direction of the first part with the first part opened at a predetermined angle of 90 degrees or more, the hinge connection between the piece-shaped locking part of the image reading device body and the first part Since force is concentrated on the engaging portion formed at one end of the side, damage is likely to occur.

(2) Since a bridge-shaped locking portion is attached to the main body of the image reading device, there is a protrusion on the same surface as the document platen glass, and when reading an original larger than the document glass, the document may get stuck on the bridge-shaped locking portion and cause scratches. Otherwise, the original will be difficult to stick to the glass of the F111 machine.

It is an object of the present invention to provide an original pressing device which does not cause damage when an excessive force is applied in the opening direction of the original pressing plate when the original pressing plate is opened and stands on its own.

[Means for Solving the Problems] The configuration of the present invention that achieves the above object includes a first part that presses the original onto the original table, one end of which is rotatably connected to the first part, and the other end of which is connected to the original. a second portion rotatably connected to the mounting table; and a first regulating means for regulating a rotation angle in a direction in which the first portion is separated from the second portion to a first predetermined angle. and a second regulating means that regulates the rotation of the second portion with respect to the document placement table and releases the regulation when a predetermined force or more is applied in the rotation direction, and
The document pressing device is characterized in that the first portion is held in an independent state when the second regulating means is in the regulating state.

[Example] An example of the present invention will be described based on FIGS. 1 to 6.

The first portion 3 of the document pressure bonding plate A, which presses the document onto the document table glass 2 serving as the original f^^ placement table of the image reading device main body l, is connected to the second portion 5 of the document pressure bonding plate by the hinge portion 4, and the second portion 5 is coupled to the image reading device main body 1 by a hinge portion 6.

The first portion 3 includes a pressure bonding sheet 7 for pressure-bonding the original onto the document table glass 2. In addition, the second portion 5 is equipped with a magnet 8 and is attracted to a metal plate 9 which is a magnetic material provided in the main body 1.
The second part is fixed to the main body 1.

FIG. 1 is a diagram showing a sheet-shaped original 10 being crimped.

FIG. 2 shows a state in which the first part 3 of the document pressure bonding plate A is opened. The second part is fixed to the apparatus main body 1 by the magnet 8 adsorbing to the metal plate 9 which is a magnetic material of the apparatus main body 1, and the first part 3
This prevents the second part 5 from falling down together with the second part 5.

If an excessive force (more than a predetermined force) is applied in the opening direction of the first part 3 in the open state shown in Fig. 2, the magnet and metal plate 9 will come off, preventing damage to the device and returning it to the state shown in Figs. 3 and 6. Become.

When pressing a thick original 12 such as a book onto the original glass plate 2, by pressing the thick original with the first part, the magnet 8 and the metal plate 9 are separated, and the second part 5 is attached to the original glass plate 2. Due to the angle, the first portion is spaced apart from and parallel to the document platen glass 2, and the thick document 1 is evenly distributed.
2 can be crimped.

In this embodiment, the second part is equipped with a magnet and the main body is a magnetic metal plate, but the main body may be equipped with a magnet and the second crimp plate can be equipped with a magnetic metal plate. Needless to say, a pair of magnets may be provided on both sides of the main body.

Further, in the embodiment described above, since there is no member protruding into the same plane as the document table glass, when a document larger than the document table glass is pressure-bonded, the document will not be damaged.

[Second example] The second embodiment will be explained using FIGS. 7 to 14.

The first part 3 of the original pressure bonding plate A has a cam-shaped protrusion 13 that is eccentric to the hinge center of the hinge part 4 that is connected to the second part 5, and when the first part 3 is opened for more than 90'' The cam-shaped protrusion lowers the position of the hinge part 4 with the second part, and brings the magnet 8 provided in the second part 5 into contact with the metal plate 9, which is a magnetic material provided in the main body 1, to generate an attractive force and
This prevents the part from falling down together with the second part 5. (Fig. 7) If the first part is not in the open state of 90 degrees or more, the hinge part with the second part 5 is raised by the eccentric cam-shaped protrusion 13 as shown in Figs. 9 to 12, and the magnet 8 and Since the metal plate 9 of the apparatus main body 1 does not contact, the second portion 5 is not fixed to the apparatus main body 1, and it is easy to open the second portion 5 to the document table glass 2 when pressing a thick original 12. (Figure 13). The other configurations are similar to the first embodiment.

[Third Example] A third example will be described using FIG. 15. In the figure, 14a and 14b are a pair of separable textile hook-and-loop fasteners, such as magic tape, Velcro, etc. (product names), and the first portion 3 is opened by more than 90 inches to achieve the desired open state. Since the second portion 5 is sometimes attracted to the main body of the device, the same effect as in the first embodiment can be obtained.In this embodiment, the magnet 8 and the magnetic metal plate 9 of the first embodiment are attached to the hook-and-loop fasteners 14a and 14b. Other than the changes, the other configurations are the same as the first embodiment.

[Fourth example] A fourth embodiment will be described using FIG. 16.

FIG. 16 is a cross-sectional view of important points in the image reading device implementing the present invention when the first portion is opened by 90° or more to reach the desired open state, and when the first document pressure plate is opened by 90° or more. When the desired open state is reached, a cam-shaped protrusion 13 that is eccentric about the hinge part 4 of the first part 3 lowers the hinge part, and the second original pressing plate comes into contact with the main body of the apparatus, and the second part 5
is attracted to the device main body 11 by the textile hook-and-loop fasteners 14a and 14b, and the same effect as in the second embodiment is obtained.

In this embodiment, the magnet 8 and magnetic metal plate 9 of the second embodiment are replaced with hook-and-loop fasteners 14a and 14b, and the other configurations are the same as the second embodiment.

The above embodiments are examples in which a magnet and a planar adsorption member such as a metal plate or a hook-and-loop fastener that can be adsorbed and separated are used.

FIG. 17 shows yet another embodiment. In this embodiment, a concave portion 6b is provided in the boss 6a of the hinge portion 6, and the device main body 1
A cylinder 21 is provided in the cylinder 22, and a spring 21 is installed in the cylinder 22.
A lock ball 23 is provided which is biased by. When the second portion 5 is closed, the lock ball 23 engages with the recess 6b to restrict rotation of the second portion 5. In this state, when the first portion 3 is rotated to a predetermined angle by the hinge portion 4, the first portion 3 abuts against the abutment portion 11 and is held in an independent state as in the first embodiment. When an excessive force of more than a predetermined value is applied to the first portion 3, the second portion 5 locks into the lock ball 2.
3, the lock ball 23 is removed from the recess 6b, and the rotation restriction of the second portion 5 is released.

[Effects of the Invention] As explained above, according to the present invention, the first
The first part of the freestanding state can be held in a freestanding state.
It is possible to provide a document pressing device that is not damaged even if an excessive force is applied to a portion thereof.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a part of an image reading device embodying the present invention, FIG.
Figure 3 is a sectional view of the main part with the magnet removed, Figure 4
The figure is a cross-sectional view of the main part in a state where a thick original is crimped, FIG. 5 is a perspective view of the device, FIG. 6 is a perspective view of the device in the state shown in FIG. 3, and FIG. 8 is a partially enlarged view of FIG. 7; FIG. 9 is a sectional view of essential parts when a sheet-like original is pressed in the second embodiment; FIG. The figure is a partially enlarged view of Fig. 9, and Fig. 11 is a partial enlarged view of Fig. 2.
12 is a partially enlarged view of FIG. 11, and FIG. 13 is a state in which a thick original is crimped in the second embodiment. 14 is a perspective view of the device in the second embodiment, FIG. 15 is a perspective view of the device in the third embodiment with the hook-and-loop fastener removed, and FIG. 16 is a perspective view of the device in the fourth embodiment. FIG. 17, which is a sectional view of a main part of the device, is a diagram showing still another embodiment. 1 is an image reading device; 2 is a document table glass; 3 is a first document pressure bonding plate; 4 is a hinge that connects the first document pressure bonding plate and the second document pressure bonding plate; 5 is a second document pressure bonding plate; 6 is a hinge that connects the second document pressure plate and the main body of the apparatus, 7 is a pressure bonding sheet, 8 is a magnet, 9 is a magnetic metal plate, 10 is a sheet-shaped document,! 1 is the abutting part, 12 is a thick original, 1
3 is a cam-shaped protrusion, 14a and 14b are textile hook-and-loop fasteners

Claims (2)

[Claims] (1) a first part that presses the original against the original placing table; a second part having one end rotatably connected to the first part and the other end rotatably connected to the original placing table; a first regulating means for regulating a rotation angle of the first part in a direction away from the document mounting table to a first predetermined angle; and a second regulating means that releases the regulation when a force exceeding a predetermined value is applied to the first part, and the first part is configured to maintain the first part in an independent state when the first and second regulating means are in the regulating state. A document crimping device featuring: (2) The document pressing device according to claim 1, wherein the second regulating means has a suction member that can be suctioned and separated.