JPH0431377B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a document placing device such as a copying machine, a facsimile machine, a document reading device, etc., and especially a document placing device configured to allow a bound thick document to be placed facing upward. Regarding.

BACKGROUND TECHNOLOGY Generally, when copying an original using a copying machine, the original is placed on an original placing table called a platen glass with the side to be copied facing down, and then the original is moved and exposed. An electrostatic latent image corresponding to the original is formed on the photosensitive drum by fixing the original and performing scanning exposure using an optical system.
The method of performing exposure by fixing the optical system and moving the document is generally used in small-sized copying machines because the apparatus can be simplified. However, when copying a bound thick document such as a book, the method of exposing the document with the side to be copied facing downward is to press the book, etc. to be copied onto a platen glass that is moved by hand. This is extremely troublesome and inconvenient as the original to be copied may be misaligned.

Therefore, in recent years, most copying machines have adopted a stationary platen even in small-sized copying machines, and the original is placed face down on this stationary platen glass and scanning exposure is performed. It is becoming. This is thought to be due to the ease of operation when a stationary platen is used, as well as the strong demand for copying thick originals such as books. However, a copying machine that uses a stationary platen and forms a latent image by operating an optical system for exposure has a limit to its miniaturization and cannot be made very small. Therefore, the present applicant has previously proposed a copying machine configured to copy a document by pressing it from below against a platen glass with the document facing up.

According to the document placement device of this copying machine, since the spring presses the document to be copied against the platen glass from below, there is no need to manually press even thick documents such as books against the platen glass surface.
It is very convenient because it allows copying while observing the page to be copied from above the platen glass, and it can be said to be a groundbreaking device in that it allows small copy machines to copy thick originals such as books. . Prior art of this type of device includes Japanese Patent Application Laid-open No. 55-43558 and Japanese Utility Model Application No. 56-88245.

The means for placing a thick document face up on the document table and pressing the thick document from below against the platen glass surface consists of three parts that move up and down independently, of which the left and right cover parts A spring is used as a means of pressing. The means for pressing the central spine portion is configured such that, for example, a link mechanism is used to press the spine portion of the document against the platen glass surface from below.

FIGS. 6 and 7 show the operating state of the pressing means when a thin original and a thick original are placed, respectively. In the diagram, 1 is the platen glass, 2 and 3
Reference numeral 4 denotes a document table; 4 to 7 refer to spring means for biasing the left and right document plates 2 and 3 toward the platen glass 1 from below; 9 denotes a back support provided between the left and right document plates 2 and 3; 10
is a cushion mounted on the back support 9.

When placing a thin original, the upper surfaces of the original tables 2 and 3 and the cushion 10 are located on almost the same plane as shown in FIG. It's forcing me.

When placing a thick original, as shown in FIG. 7, the back cover of the thick original 12 bends the cushion 10, and the throat of the thick original 12 is slightly lowered so that the left and right sides of the original to be copied are Place the paper surface on the platen glass 1.
is pressed against.

Problems to be Solved by the Invention However, according to the above-mentioned conventional document placement device, when placing a thick document such as a book, etc., which is printed all the way to the back of the throat, it is difficult to remove the throat. It becomes difficult to bring the platen into close contact with the platen glass 1. Because,
As shown in FIG. 7, since the reaction force from the cushion 10 acts almost uniformly on the entire surface of the spine 13 of the thick document 12, a sufficient force is not applied in the direction to push the thick document 12 open. Because it will be.

Furthermore, if an attempt is made to lift the back support base 9 upward using a link mechanism (not shown) and forcefully press the back cover portion 13 through the cushion 10, the pressing force acting on the platen glass 1 increases, causing the platen glass 1 to bend. This could lead to a dangerous situation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a document mounting table device that solves these problems and is capable of reliably copying a thick document to the back of its throat.

Means for Solving the Problems In order to achieve the above object, the document placing device of the present invention places a document such as a book to be copied face up on a document placing table, and places a platen from above the document. At the same time as pressing the glass and setting the document, a chevron-shaped back push block is attached to the back push stand that supports the center of the document, a cushion layer is provided on this back push block, and the top surface is shaped so that the bottom surface corresponds to the cushion layer. The cushion member is constructed by removably fitting a flat cushion member into the cushion layer.

In an embodiment of the present invention, it is preferable that the back press block is made of a foamed resin material or the like, and the cushion layer and the cushion member are made of a sponge or the like.

According to the present invention, when copying a thin document, a cushion member is fitted into the cushion layer formed on the surface of the backing block, and a flat surface is formed between the upper surface of the cushion member and the upper surfaces of the left and right document tables. A copy image corresponding to the thin original can be obtained by placing the thin original on a flat surface and uniformly pressing the entire surface of the thin original against the platen glass.

When copying a thick original, remove the cushion member and place the spine of the thick original on the cushion layer on the surface of the mountain-shaped back press block, so that the back of the throat of the thick original is pressed against the platen. When placed close to the glass, it is possible to obtain a clear copy image up to the throat of a double-page spread of a document.

In particular, when placing thick originals, the cushion layer on the surface of the backing block fully exhibits the double-page spread effect and anti-slip effect for each page from the first page to the last page of the thick original. It is possible to accurately copy the back of the throat.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 5 shows the document placement device 14 of the present invention.

Projecting parts 16 and 17 are formed on both sides of the box-shaped main frame 15. Two openings 18 and 18 are provided in the overhang 17 and spaced apart from each other, and a platen frame 20 is attached to the overhang 16 so as to be openable and closable about a hinge 22 . A platen glass 24 is fitted into the center of the platen frame 20.
Furthermore, a handle 21 is provided on one side of the distal end of the frame 20. Two latches 26 , 26 are attached to the lower end of the platen frame 20 , and when the platen frame 20 is closed to the main body frame 15 , the latches 26 , 26 are attached to the overhang 17 of the main body frame 15 . opening 1
8 and 18.

Referring to FIG. 1, the document placement device 1 in FIG.
A partial cross section of 4 is shown, and the document table 30 housed within the box-shaped main body frame 15 is divided into three parts as shown. That is,
Manuscript stands 2 and 3 on which the left and right covers of a book, etc. (not shown) opened open, are placed, and a spine support stand 9 on which the spine is placed.
Of these, the document tables 2 and 3 are each biased upward by compression springs (not shown), and a book (not shown) placed on the document table 30 is pressed against the lower surface of the platen glass 1. There is.

The back pusher 9 is configured such that when a screw (not shown) is turned in a certain direction using a link mechanism and a screw mechanism (not shown), the back pusher 9 is gradually lifted. A back push block 31 made of a foamed resin such as Sunlac Home (trade name, manufactured by Asahi Kasei), for example, is adhered to the upper surface of the back push stand 9 with a magic tape 34. This back press block 31 is provided on the upper surface of the back press stand 9 along a position corresponding to the spine of the book to be placed so that the cross section is mountain-shaped. A cushion layer 32 made of sponge is adhered to the surface of the back press block 31 with an adhesive. On the upper side of the cushion layer 32, this cushion layer 3
A cushion member 33 having a groove corresponding to the chevron-shaped shape in the lower surface thereof is removably fitted therein. The cushion member 33 is made of sponge,
The upper surface thereof is formed flat so as to be parallel to the lower surface of the platen glass 1.

Now, as shown in FIG. 2, when a thin book 35 is placed on the original table 30, the spine 35 of the thin book 35
a is located on the upper surface 33a of the cushion member 33. In this case, the upper surface 33a of the cushion member 33
is brought close enough to the lower surface of the platen glass 1 to the back side of the throat of the thin book 35 to the extent that it is slightly bent downward. Therefore, the portion of the thin book 35 to be copied can be brought into close contact with the lower surface of the platen glass 1, and a copy image without image defects can be obtained.

As shown in FIG. 3, when a thick book 36 is placed on the original platen 30 and the middle page of this thick book 36 is to be copied, the upper surface of the left and right original plates 2 and 3 is slightly lowered. The spine support 9 is lowered to this position, and the top of the cushion layer 32 of the spine press block 31 supports the spine 36a of the thick document 36 in its longitudinal direction. For this reason, the back of the throat side of the double-page spread on the opposite side of the spine 36a can be brought close to the bottom surface of the platen glass 1, so that the double-page spread of the thick book 36 can be brought into close contact with the platen glass 1 up to the back of the throat. , the entire double-page spread can be clearly copied without image loss.

Further, as shown in FIG. 4, when the shoulder pages of a thick book 36 are opened on the document table 30, the cushion layer 32 of the back press block 31 pushes up the spine 36a from below, causing the thick book to open. The rear side of the throat of the double-page spread of 36 is brought close to the bottom surface of the platen glass 1, thereby making it possible to clearly copy the back of the binding side of the double-page spread of the thick book 36, which is difficult to copy, without image shift. can. At this time, the document table 3 on the side with the larger number of pages of the thick book 36 contracts the compression spring (not shown) and moves downwards more than the document table 2 on the opposite side.
is supported in an inclined state with respect to the cushion layer 32, but at the same time, the cushion layer 32 exerts an anti-slip effect on the spine section 36a of the thick book 36, preventing the book 36 from running away to the thick page side. I can't stand it.

In this way, when copying a thin original such as a sheet original, the cushion member 33 is fitted, the original plates 2 and 3 and the cushion member 33 form a flat surface, and the sheet original is placed flat on the platen. It can be pressed against the glass 1. On the other hand, when copying a thick document, the cushion member 33 is removed, and the top of the mountain-shaped cushion layer 32 is used to push the back of the throat side of the double-page spread of the thick document close to the platen glass. Since the image can be attached, it is possible to obtain an accurate copy image without any deviation and without image loss even in the deep corner of the throat side, which has traditionally been difficult to copy.

In the embodiment described above, the back press block 31 is made of a foamed resin that is harder than the sponge that is the material of the cushion member 33, but the back press block 31 is made of a foamed resin that is relatively easier to break than the material of the platen glass 1. Therefore, when the back push block 9 is lifted upward by a link mechanism (not shown), a large load may be applied to the platen glass 1, but the back push block 31 is Since it collapses, it can be said that it is quite superior in terms of safety.

In this embodiment, the back press block is made of foamed resin, the cushion layer is used, and the cushion member is made of sponge. However, the invention is not limited to these, and any material having similar strength, elasticity, and friction can be used as appropriate. Needless to say. Further, the entire length of the spine may be supported in the longitudinal direction, or the spine may end at an appropriate length in the longitudinal direction. Of course, it is also possible to further divide it into several parts.

Effects of the Invention As explained above, according to the present invention, a mountain-shaped back push block is provided on the back push stand provided between the left and right document tables, and a cushion layer and a cushion member are attached to the upper side of the back push block. Since the cushion member is made removable depending on the thickness of the original, a copy image corresponding to the original can be accurately obtained for either thin or thick originals without image defects such as missing images or image shifts. be able to.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing the main parts of an embodiment of the present invention, FIGS. 2 to 4 are structural sectional views showing the usage state of the embodiment of FIG. 1, and FIG. A perspective view showing an example, and FIGS. 6 and 7 are schematic cross-sectional views showing the state of use of the conventional example, respectively. DESCRIPTION OF SYMBOLS 1...Platen, 2, 3...Document stand, 9...Back pressure stand, 31...Back pressure block, 32...Cushion layer, 33...Cushion member, 34...Magic tape, 35...Thin book, 36...Thick book.

Claims (1)

[Claims] 1. In a document placement device that places a document such as a book to be copied face up on a document placement table and sets the document by pressing a platen glass from above the document, a back support that supports the center of the document is used. A chevron-shaped back pressing block is attached to the back pressing block, a cushion layer is provided on the back pressing block, and a cushion member whose lower surface has a shape corresponding to the cushion layer and whose upper surface is flat is removably fitted into the cushion layer. Document loading device.