JP3592390B2 - Document holding device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a document pressing device used for an image recording apparatus for exposing and recording an image of a document by placing the document on a transparent document table such as a platen glass, and pressing the document onto the document table.
[0002]
Problems to be solved by the prior art and the invention
As a copier, a document is placed on a platen glass, light is irradiated from below to scan and expose the image of the document on a photosensitive material with reflected light, and after exposure, an image receiving paper is supplied and it is overlapped with the photosensitive material. In some cases, heat development transfer is performed, and then the image receiving paper is separated from the photosensitive material.
[0003]
In such a copying machine, a platen cover that covers the platen glass from above is provided so as to be openable and closable, and the platen cover closes the document so that the document is pressed by the platen cover.
[0004]
The original is positioned on the platen glass with one end of the original abutting on the reference part.If the original is a thin sheet, the platen cover is used to hold the original. When the document is closed, the document may move due to the wind pressure or the like, and the document may be displaced.
[0005]
Therefore, when closing the platen cover and trying to press the document with the platen cover, it is desirable to hold the document separately from the platen cover so that the document does not shift, and to separate the document separately from the platen cover. What is necessary is just to provide the holding plate which holds down. However, when the original is a thick one such as a book, the pressing plate becomes an obstacle.
[0006]
For this purpose, there is a type in which the pressing plate is moved from a position on the platen glass to a position retracted from the platen glass.
[0007]
For example, Japanese Patent Application Laid-Open No. 3-242635 discloses a structure in which a holding plate is turned around a vertical line, and a structure in which a holding plate is turned around a horizontal line. However, in such a structure, the operability is poor such that the movement of the holding plate follows an arc orbit and the amount of movement increases. Further, the holding plate is provided only for that purpose, and a space for the holding plate is separately required.
[0008]
In view of the above circumstances, the present invention improves the operability, securely presses the document to the positioned position, and not only the function of holding down, but also the function of holding down the document, and further, the document of the image recording apparatus which also saves space. It is an object to provide a holding device.
[0009]
[Means for Solving the Problems]
The document pressing device of the image recording device according to the present invention according to claim 1,
Used in image recording devices that place an original on a transparent platen such as a platen glass to expose and record the image of the original, and a document presser that presses the original onto the platen.
A positioning member having a reference portion that abuts one end of the document to position the document on the document table;
A pressing member having a pressing portion at a front end portion for pressing the original on a platen;
A first position in which the pressing member is supported by the positioning member, and the pressing member is linearly movable in a direction along the table surface of the document table so that the pressing section protrudes inward from the reference section to the document table; Supporting means for retracting to the reference portion to obtain a second position forming a part of the reference portion with the pressing portion, and enabling the pressing member to be rotatable so that the pressing portion can be moved in the direction facing the document table; ,
Biasing means provided between the pressing member and the positioning member, for urging the pressing member to rotate in a direction to press the document by the pressing portion;
Holding means for holding the holding member at the first position and the second position by the urging force of the urging means;
It is characterized by the configuration provided with.
[0010]
[Action]
According to the above configuration, when the document is a thin sheet, first, the pressing member is moved from the second position to the first position so that the pressing portion protrudes into the document table. After the protrusion, the pressing member is rotated to form a gap between the pressing portion and the document table, and one end of the document is inserted into the gap and the one end is brought into contact with the reference portion to position the document. When the operation of the pressing member is stopped in that state, the pressing portion presses the positioned document onto the document table.
[0011]
When the original is a book-shaped thick one, the pressing member is moved from the first position to the second position, and the pressing portion is retracted, and the pressing portion forms a part of the reference portion and positions the original. Make
[0012]
As a result, the operability can be improved, the original can be reliably held at the positioned position, and the function to be exerted can be not only the pressing function but also space saving.
[0013]
【Example】
An embodiment of a document positioning device for an image recording apparatus according to the present invention will be described below with reference to FIGS.
[0014]
As shown in FIG. 11, a transparent platen glass (original platen) 14 is fitted on the upper surface of a copying machine (image recording apparatus) 12, and one end of the platen glass 14 according to the present embodiment is arranged along the edge. A document positioning device 16 is provided.
[0015]
In the copying machine 12, a photosensitive material is arranged below the platen glass 14 to face the same, and an exposure unit is run between the platen glass 14 and the photosensitive material along the both. The original 18 covered with is irradiated with light, and the image of the original 18 is scanned and exposed to the photosensitive material with reflected light. After the exposure, an image receiving paper (image receiving material) is supplied from a magazine, conveyed, superimposed on a photosensitive material and thermally developed and transferred, and thereafter, the image receiving paper is peeled off from the photosensitive material.
[0016]
As shown in FIGS. 1 to 4, a base plate 24 (first member) is provided on the frame 22 of the copying machine 12 along the edge 15 of the platen glass 14. The base plate 24 is in the form of a long plate that extends over the length of the edge of the platen glass 14, and can be made of metal. First mounting holes 26 and 30 are formed at both ends in the longitudinal direction of the base plate 24.
[0017]
A first mounting bolt 34 is inserted into each of the first mounting holes 26 and 30 from above. The first mounting bolt 34 is screwed and fastened to a first female screw 36 formed on the frame 22 to attach the base plate 24.
[0018]
On the base plate 24, a positioning plate (a second member as a positioning member) 38 is provided. The positioning plate 38 has a long plate shape facing the base plate 24 and extending in the longitudinal direction thereof, and can be made of a synthetic resin.
[0019]
On the upper surface of the positioning plate 38, a rectangular recess 40 is formed at the center in the longitudinal direction and extends on both sides in the width direction of the positioning plate 38 (direction perpendicular to the longitudinal direction of the positioning plate 38).
[0020]
Further, second mounting holes 42 are formed in the positioning plate 38 on both left and right sides in the longitudinal direction of the positioning plate 38 via the recesses 40. The second mounting hole 42 is a long hole that is long in the longitudinal direction of the positioning plate 38. A second female screw 44 is formed in the base plate 24 corresponding to the second mounting hole 42. A second mounting bolt 46 is inserted into the second mounting hole 42 from above, and the second mounting bolt 46 is screwed into the second female screw 44 to attach the positioning plate 38.
[0021]
As shown in FIG. 7, the portion of the positioning plate 38 along the edge of the platen glass 14 has a gap 62 on the lower side, and the edge of the platen glass 14 is inserted into the gap 62, and the upper side of the gap 62 Is set as the reference portion 60. A reference line (not shown) is engraved on the reference portion 60 along the longitudinal direction of the positioning plate 38, and the document 18 is positioned vertically and horizontally by abutting one end of the document 18 on the reference portion 60. be able to.
[0022]
A holding plate (holding member) 52 is provided in the recess 40 of the positioning plate 38. The holding plate 52 can be made of a synthetic resin, and can be freely moved linearly in the direction of arrow D along the width direction of the positioning plate 38 (along the glass surface of the platen glass 14). The tip of the holding plate 52 serves as a holding portion 53, and the holding portion 53 protrudes inward of the platen glass 14 and advances to the first position (the position shown in FIGS. 9 and 10), and retracts to the reference portion 62 to retract. The obtained second position (the position shown in FIG. 8) is obtained. In FIG. 3, both the second position forming the part of the reference part 60 with the pressing part 53 being on the same plane as the reference part 60 and the first position protruding from the reference part 60 are indicated by chain lines.
[0023]
A leg portion 54 is suspended from the holding plate 52 at an intermediate portion in the movement direction, and pin projections 56 project from the leg portion 54 on both left and right sides as viewed from the holding plate 52 movement direction. A guide recess 58 is formed on the side wall 59 of the recess 40 corresponding to the pin protrusion 56. As shown in FIGS. 5 and 6, the guide recess 58 extends in the width direction of the positioning plate 38, and the pin protrusion 56 is fitted into the guide recess 58 to prevent the positioning plate 38 from falling off. Moves in the guide recess 58 in this extending direction, thereby guiding the movement of the holding plate 52. In addition, on the upper surface of the positioning plate 38, the pin protrusion 56 is inserted into the guide recess 58 when the positioning plate 38 is mounted in the recess 40 outside the movement area between the first position and the second position of the holding plate 52. For introduction, an introduction port 57 communicating with the guide recess 58 is formed.
[0024]
The pressing plate 52 is rotatable about the pin protrusion 56 in the direction of arrow C (around the longitudinal line of the positioning plate 38), and the pressing portion 53 extends along the direction facing the glass surface of the platen glass 14 ( (In the vertical direction). The lower surface of the holding plate 52 comes into contact with the convex portion 65 raised from the bottom 64 of the recess 40 at the end on the side of the platen glass 14 so as to prevent the holding portion 53 from moving downward. The rotation of the holding plate 52 is prevented. The blocked rotation position is such that the pressing portion 53 contacts the glass surface of the platen glass 14. At the second position of the holding plate 52, the retreating end of the holding plate 52 is correspondingly raised from the bottom 64 of the recess 40 at the end opposite to the forming end of the projection 65. In contact with the convex portion 62, the rotation of the pressing plate 52 corresponding to the pressing portion 53 is prevented so as to prevent the pressing portion 53 from moving upward. When the holding plate 52 is moved from the second position to the first position, the end of the holding plate 52 on the retreating side is separated from the convex portion 62 and the corresponding holding member is allowed to allow the holding portion 53 to move upward. The rotation of the plate 52 is allowed.
[0025]
A leaf spring (biasing member) 66 is interposed between the holding plate 52 and the bottom 64 of the recess 40. One end of the leaf spring 66 is bolted to the lower surface of the leg 54, and the other end is a free end, and is bent downward in a semicircular shape. An engagement block 71 is projected from the bottom 64 of the recess 40 corresponding to the bent portion 67, and the engagement block 71 is provided with a first engagement recess 70 and a second engagement recess 68. The plates 52 are formed at predetermined intervals along the moving direction. The bent portion 67 engages in the first engagement recess 70 on the advance side of the holding plate 52 at the first position of the holding plate 52 (see FIG. 9), and at the second position, the first recess 70 on the back side of the holding plate 52. It engages in the two engagement recesses 68 (see FIG. 10). The leaf spring 66 urges the holding plate 52 to rotate in the direction of moving the holding portion 53 downward (turns from the solid line position in FIG. 10 to the chain line position), and at the same time, the bent portion 67 of the leaf spring 66. Are held to be engaged with the first engagement recess 70 or the second engagement recess 68. That is, in order to move the holding plate 52 from the second position to the first position, the leaf spring 66 is elastically bent and deformed so that the bent portion 67 is moved between the first engagement recess 70 and the second engagement recess 68. Needs to be exceeded. This also gives a sense of moderation when the pressing plate 52 is moved.
[0026]
The first engaging recess 70, the second engaging recess 68, and the bent portion 67 of the leaf spring 66 constitute a holding unit.
[0027]
Next, the operation of the above configuration will be described.
First, when the document 18 is a thin sheet, the pressing plate 52 is moved from the second position to the first position so that the pressing portion 53 protrudes into the platen glass 14 (see FIG. 9). . After the protrusion, the retreating end of the holding plate 52 is pushed downward, and the holding plate 52 is rotated against the urging force of the leaf spring 66 (from the position indicated by the dashed line in FIG. 10 to the position indicated by the solid line). A) A gap is formed between the pressing portion 53 and the glass surface of the platen glass 14, one end of the document 18 is inserted into the gap, and the other end is brought into contact with the reference portion 60 to position the document 18. I do. When the pressing operation of the pressing plate 52 is stopped in this state, the pressing portion 53 obtains the chain line position in FIG. 10 by the urging force of the leaf spring 66, and the original 18 is pressed against the glass surface of the platen glass 14 by the pressing portion 53. Attached.
[0028]
When the original 18 is a thick book, the pressing plate 52 is moved from the first position to the second position, and the pressing portion 53 is retracted. This does not hinder the placement of the thick original 18. The pressing portion 53 is retracted to the reference portion 60 and forms a part of the reference portion 60. The document 18 can be positioned by bringing one end of the document 18 into contact with the reference portion 60 including the pressing portion 53. It is.
[0029]
The pressing plate 52 needs only to be operated linearly between the first position and the second position and to rotate at the first position. The moving area is small, and the document 18 can be reliably pressed to a predetermined position. . The pressing plate 52 not only functions to hold the original 18 in a sheet shape but also functions as the reference portion 60 when the original 18 is in a book shape. In addition, it is not necessary to provide a space for installing the holding plate 52 only therefor. Since the holding portion 53 of the holding plate 52 only forms a part of the reference portion 60, even when the holding plate 52 projects to the first position, the original reference portion 60 sufficiently fulfills the positioning function, The positioning function is not impaired.
[0030]
As a result, the operability can be improved, the original can be reliably held at the positioned position, and the function to be exerted can be not only the pressing function but also space saving.
[0031]
The present invention is not limited to the above embodiments, and various modifications are possible. For example, the image recording apparatus is not limited to the copying machine of the above embodiment, and the image recording material is not limited to the image receiving material.
[0032]
Further, the positioning member, the support means, and the holding means are not limited to those in the above embodiment.
[0033]
【The invention's effect】
As described above, according to the document pressing device of the image recording apparatus of the present invention, the operability is improved and the document is securely pressed at the positioned position, and the function to be exhibited is not only the pressing function, Further, space saving can be achieved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a document pressing device of an image recording apparatus according to the present invention.
FIG. 2 is a plan view showing a state where a base plate is attached.
FIG. 3 is a plan view showing a state where a positioning plate is attached.
FIG. 4 is an end view taken along line 4-4 of FIG. 3;
FIG. 5 is an end view along line 5-5 in FIG. 3;
FIG. 6 is an end view taken along line 6-6 of FIG. 3;
FIG. 7 is an end view taken along line 7-7 of FIG. 3;
FIG. 8 is an end view taken along line 8-8 of FIG. 3;
FIG. 9 is a view corresponding to FIG. 8, showing an operation process of the holding plate.
FIG. 10 is a view corresponding to FIG. 8 and showing the next operation process of the holding plate.
FIG. 11 is a schematic perspective view of a copying machine.
[Explanation of symbols]
12. Copy machine (image recording device)
14 Platen glass (platen)
16 Document positioning device 18 Document 22 Frame 38 Positioning plate (positioning member)
52 Holding plate (holding member)
56 pin protrusion (supporting means)
58 Guide recess (supporting means)
60 Reference part 66 Leaf spring (biasing means)
67 Bending part (holding means)
68 Second engaging recess (holding means)
70 First engagement recess (holding means)

Claims (1)

Used in image recording devices that place an original on a transparent platen such as a platen glass to expose and record the image of the original, and a document presser that presses the original onto the platen.
A positioning member having a reference portion that abuts one end of the document to position the document on the document table;
A pressing member having a pressing portion at a front end portion for pressing the original on a platen;
A first position in which the pressing member is supported by the positioning member, and the pressing member is linearly movable in a direction along the table surface of the document table so that the pressing section protrudes inward from the reference section to the document table; Supporting means for retracting to the reference portion to obtain a second position forming a part of the reference portion with the pressing portion, and enabling the pressing member to be rotatable so that the pressing portion can be moved in the direction facing the document table; ,
Biasing means provided between the pressing member and the positioning member, for urging the pressing member to rotate in a direction to press the document by the pressing portion;
Holding means for holding the holding member at the first position and the second position by the urging force of the urging means;
A document holding device comprising:

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