JPH046540A - Image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an image forming apparatus in which the positioning state of a document can be confirmed after closing a document cover.

(Prior Art) Generally, an image forming apparatus such as a copying machine places a document on a document table made of a glass plate, and covers the document cover with a document cover that is attached to the document table and holds the document under pressure. , the copy is set to start. When placing a document, the document is positioned by making it come into contact with a positioning scale provided at one end of the document table.

However, when closing the document cover after positioning, the document is often agitated and deviated from the predetermined position, resulting in a large number of defective copies.

This is because the state of the document cannot be seen after the document cover is closed, and in order to prevent the document from shifting, it is necessary to close the document cover gently. However, since defective copies do not occur frequently, closing them quietly each time will significantly reduce work efficiency.
Measures to address this were requested.

It is also possible to install a window on the platen sheet to check the position of the document, but by retracting the platen sheet,
There is an inconvenience that the document is warped and misaligned.

(Problem to be Solved by the Invention) If the document cover is opened and closed quickly to improve work efficiency, the document may be agitated and deviated from its designated position, resulting in defective copies. There is an inconvenience that opening and closing it will significantly reduce work efficiency.

It is also conceivable to provide a window in the document cover to check the position of the document, but this has the disadvantage that the document may be misaligned by retracting the platen sheet through the window.

The present invention has been made in order to solve the above-mentioned disadvantages, and provides an image forming apparatus that prevents the occurrence of defective copies without reducing work efficiency, and does not cause misalignment of originals. The purpose is to

[Structure of the Invention (Means for Solving the Problems) To achieve the above object, the image forming apparatus according to claim (1) of the present invention covers an original on an original platen with an original cover, and displays an image of this original. In an image forming apparatus that forms an image on an image carrier from an image carrier, the document cover includes a housing that is openable and closable with respect to the document table and has a viewing section for checking the positioning state of the document when the cover is closed; a platen sheet that covers the document that is visible from the viewing section between the body and the document table, an advancing/retracting means that moves the platen sheet back and forth along the document table, and a contact/separator that presses the platen sheet against and away from the document table. The present invention is characterized by comprising a moving means for moving the platen sheet independently from the housing and away from the document table between the covering position and the position where the document is visible. It is something to do.

Further, an image forming apparatus according to claim (2) is an image forming apparatus that covers a document on a document table with a document cover and forms an image on an image carrier from an image of the document, wherein the document cover covers a document on the document table. a casing that can be opened and closed freely and has a viewing section that confirms the positioning state of the document when the cover is closed; and a platen sheet that covers the document that is visible from the viewing section between the casing and the document table. an advancing/retracting means consisting of a timing belt that holds and runs the platen sheet and moves it forward and backward along the document table; and an approaching/separating means consisting of a drive pulley for the timing belt that presses the platen sheet against and away from the document table by rotation. and a moving means for moving the platen sheet independently from the casing and away from the document table between the covering position and the position where the document is visible. It is something.

(Function) The image forming apparatus according to claim (1) is provided with a viewing part in the housing of the document cover, and the platen sheet can be moved while being separated from the document table even when the housing is closed. It is possible to freely retract and cover the original in position, and there is no fear of the original being displaced.

Further, in the image forming apparatus according to claim (2), the advancing/retracting means is constituted by a timing belt, and the approaching/separating means is constituted by a driving boot, so that the structure is extremely simple, lightweight, and accurate.

(Example) The details of the present invention will be explained below by way of an example with reference to the drawings.

The image forming apparatus of this embodiment includes a main body 1 and a document holding section 11.
, an exposure scanning section 21 , a paper feeding section 31 , and an image forming section 41
and a paper discharge section 51.

It should be noted that the present invention relates to the document holding section 11 in this embodiment, and the rest is almost the same as a conventional image forming apparatus.
The document holding section 11, which is an important component of the present invention, will be explained in detail.

The main body 1 accommodates various parts, and has openings at the upper end and lower left and right sides, and has a cooling fan 2 installed inside.

Although the details will be described later, the document holding section 11 has a document table 12 made of a glass plate that covers the upper opening of the main body, positioning scales 13a and 13b attached to both ends of the document table, and a viewing window 15a as a viewing section. , a document cover 15 attached to the main body 1 so as to be openable and closable, and a document table 1.
A document cover 15 holds the document 14 placed on the document 2 .

The exposure scanning section 21 includes a moving first carriage 2 having a light source body 22a consisting of an illumination device and a reflecting mirror 22b.
2, a moving second carriage 24 having reflective mirrors 24a and 24b, an imaging lens 25, and a reflective mirror 26a.
, 26b, and 26c.

Then, as the first carriage 22 moves, the light source body 22a
scans the original 14 while irradiating it, the original 14
The reflected light from the imaging lens 2 passes through the reflecting mirror 24a124b of the second carriage 24, which moves at an appropriate speed.
5 and forms an image of the original 14 on the photosensitive drum 42.

The paper feeder 1i [31 is for supplying paper P as an image carrier, and includes a manual feed cassette 3285 cassettes 32b, 32
The paper P, which is appropriately taken out according to an external signal, reaches the aligning roller 34 via the separating roller 33a or 33b, and is then transferred to the photosensitive drum 42 at an appropriate time.
sent to.

The image forming section 41 has the above-mentioned rotating photosensitive drum 42, and a developing device 42a1, a transfer charger 42b, a peeling charger 42c, a cleaner 42d, and a static eliminator 4 are provided on the outer periphery of the photoreceptor drum 42.
A 2e1 main charger 42f and the like are arranged. Further, a conveyor 43 and a pair of fixing rollers 44 are provided.
The latent image formed on the photoreceptor drum 42 by image formation is visualized by a developing device 42a, transferred to paper P by a transfer charger 42b, peeled off by a peeling charger 42c and conveyed, and transferred to a fixing roller. The sheet is heated and fixed in step 44 and sent to the sheet discharge section 51.

In the paper ejection section 51, the fixed paper P is stored in a paper ejection tray 53 via a paper ejection roller 52.

This concludes the general explanation of the configuration and operation of this embodiment.
Let me explain about 1.

The document cover 15 includes a housing 16, a platen sheet 17, and a moving means 18.

The housing 16 is made of a lid-like member that covers the document table 12 in an openable and closable manner, and a viewing window 15a constituting a viewing section in which a transparent glass plate 16a is fitted is provided at the left end of the housing 16 in FIG. . This allows the state of the original 14 at a visible position near the positioning scale 13g to be confirmed when the original platen 12 is closed and viewed from above.

Further, a platen sheet 17 is attached to the lower surface of the housing 16, that is, on the side of the document table 12, via a member of a moving means 18, so that the viewing window 15a can be opened and closed. This is formed so as to press and hold the original 14 when the cover is closed. Then, when moving to the left end (in the direction of arrow 17a),
Close the viewing window 15a to cover the document, and move the right edge (arrow 17b)
It is configured to have an appropriate length so that it opens and retreats from the document when it moves in the direction (direction).

The moving means 18 is provided in the housing 16.

This has a sheet holder 101 into which a platen sheet 17 is fitted and held, a pair of support pins 103, 103 are attached to the right end 102, and a protruding arm 105, 105 is attached to the left end 104. It is provided. The support pins 103.103 are opposed to the support members 106.106 attached to the housing 16, and the support pins 103.103 are slidably fitted into elongated holes 107.107 provided in the support members 106.106, and the platen sheet 1
7 is rotatable and movable left and right (visual window 1
5a) is attached to the document cover 16 so as to be freely openable and closable.

Further, near the left end of the housing 16, a driving member for driving the platen sheet 17 to open and close is attached.

That is, a drive shaft 111 is rotatably attached, and is rotationally driven by a motor 113 via a gear train 112. This drive shaft 111 has a drive pulley 114.
．． 114 is attached, and a driven pulley 11.5.115 is rotatably attached to the document cover 16 opposite to this. Furthermore, these two pulleys 114.11
A timing belt 116, 116 is stretched between the arms 105, 105, and the drive pin 117.
．． They are rotatably connected by 117.

This drive pin 117 is guided and supported by the guide body 1]8.118, and the timing belt 116.1
16, the drive pulley 114.114
At this point, it comes off the upper surface of the guide body 117 and rotates downward as the drive boot rotates. That is, the timing belt 116 constitutes an advancing/retracting means 18a, and the driving pulley 1
Reference numeral 14 constitutes a contact/separation means 18b.

Note that, as shown in FIGS. 5 to 8, when the platen sheet 17 is at the right end, the sheet holder 101, that is, the platen sheet 17 is held high at the left end by the contact/separation means 18b. It is tilted and separated from the document table 12. In this state, advance/retreat means 1
8a, the platen sheet 17 is moved forward by a distance to the left, and at the left end, by the rotation of the pulley 114, which is the contact/separation means 18b, the platen sheet 17 is lowered by a height H, and the platen sheet 17 is pressed against the document table 12. By moving left and right in this manner, the viewing window 15a is opened and closed, and the document 14 is retracted and covered.

The document holding section 11 is configured as described above, and its operation will be explained next.

First, open the document cover 15. At this time, the platen sheet 17 is positioned at the right end, and the viewing window 15a is left open. Next, the original 14 is placed on the original table 12, and the original cover 15 is closed. When looking through the viewing window 15a, the state of the document 14 can be viewed along with the positioning scale 13a. At this time, it can be easily confirmed whether the original 14 is placed in the desired state as shown in FIG. 12, or if it is misaligned as shown in FIG. After confirming that the document 14 is placed at the desired position, the moving means 18 is driven.

As a result, the timing belt 1, which is the advancing/retracting means 18a,
16 is driven, the sheet holder 101 moves to the left together with the platen sheet 17, closes the viewing window 15a, and then descends by the rotation of the drive pulley 116, which is the approaching/separating means 18b, and the platen sheet 17 is moved to the left side by the original 14.
Cover and hold by pressure. At this time, since the platen sheet 17 moves away from the original 14, the position of the original 14 is not shifted.

Since the functions of the subsequent parts are the same as those of the prior art, their explanations will be omitted.

In this embodiment, a belt drive is used as the moving means, but the present invention is not limited to this, and gear drives, lever mechanisms, electromagnets, etc. may also be used. Furthermore, the viewing window does not necessarily require a transparent shield.

[Effects of the Invention] As described in detail above, in the image forming apparatus of the present invention, since the document cover is provided with the viewing window, misalignment of the document can be easily discovered even after the document cover is closed. Therefore, even if the document is placed quickly and the document is misaligned, the occurrence of defective copies is reliably prevented, and copying operations can be performed with high efficiency without being bothered by occasional misalignment of the document.

In addition, since the approaching/separating means for lifting the platen sheet and the advancing/retracting means for moving the platen sheet are provided, it is possible to visually check the original without coming into contact with the document.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a top perspective view with the document cover closed, FIG. 3 is a top perspective view with the document cover open, and FIG. 4 5 is a front view of the main parts of the moving means, FIG. 6 is a perspective view of the moving means, and FIGS. 7 and 8 are views of the operation of the moving means. The explanatory diagrams, FIGS. 9 to 11, are diagrams for explaining the operation of the platen sheet, and FIGS. 12 and 13 are diagrams for explaining the positional deviation of the original.

Claims (2)

[Claims] (1) In an image forming apparatus that covers a document on a document table with a document cover and forms an image on an image carrier from an image of the document, the document cover is provided to be openable and closable with respect to the document table and can be closed and closed. a housing having a viewing part for checking the positioning state of the original document; a platen sheet that covers the original that is visible from the viewing part between the housing and the document table; The platen sheet has an advancing/retracting means that moves the platen sheet forward and backward, and a contacting/separating means that presses the platen sheet against and away from the document table, and the platen sheet is moved independently from the housing and separated from the document table to cover the above-mentioned covering position and the position where the document is visible. An image forming apparatus comprising: a moving means for moving the image forming apparatus between the image forming apparatus and the image forming apparatus. (2) In an image forming apparatus that covers a document on a document table with a document cover and forms an image on an image carrier from an image of the document, the document cover is provided so as to be openable and closable with respect to the document table and can be closed and closed. It consists of a housing having a viewing part for checking the positioning state of the original document, a platen sheet that covers the original that is visible from the viewing part between this housing and the document table, and a timing belt. The platen sheet is independent of the casing, and includes an advancing/retracting means for holding and moving the platen sheet and advancing and retracting it along the document table, and a drive pulley for the timing belt. An image forming apparatus comprising a moving means for moving the original between the covered position and a position where the original is visible, separated from the original table.