JP2002014432A - Original cover opening/closing mechanism for image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate trouble that an original cover is firmly closed because the original cover falls down by its own weight and the original cover is broken or a user's hand is caught and injured according to circumstances when a user sets an original and closes the original cover in an image forming device. SOLUTION: The original cover 10 attached to the original placing part 41 of the image forming device 1 and opened/closed to turn centering around a supporting point is provided with a holding means 100 opened to a totally opening position without stopping when it is opened from a closing position and temporarily stopped at a middle position between the fully opened position and the closing position when it is closed from the totally opening position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover opening / closing mechanism for pressing a document in a document reading section of an image forming apparatus such as a copying machine or a multifunction machine having both a copying function and a facsimile function.

[0002]

2. Description of the Related Art An image forming apparatus such as a copying machine or a multifunction machine having both a copying function and a facsimile function and an image reading scanner are provided with a cover for pressing an original to a desired position. The reading of the document of the image forming apparatus is usually performed while the optical system is moving, but the reading of the document on a wide-width machine capable of copying a large document such as A0 or A1 is performed by scanning the document against a fixed light source in front of the machine. It is configured to move from the back to the back side and read in. For this reason, a roller for conveying the original is provided on the original pressing cover. In addition, since the thickness of the document is different between a single sheet and a plurality of pages such as a book, the document pressing cover can be exchanged accordingly.

In these image forming apparatuses, when a user sets a document and closes the document cover, the cover falls down due to its own weight, and the cover is strongly closed. In some cases, the cover may be damaged or the hand may be pinched and damaged. In some cases, the original cover is fixed to the original mounting table with a damper or the like so that the cover does not come down at once by its own weight and stops at an arbitrary position.

[0004]

However, as described above, when the original cover is fixed to the original placing table with a damper or the like, when the original pressing cover is replaced due to a difference in the thickness of the original, the work becomes very troublesome. Would. Therefore, there is a demand for a safe and easy-to-replace document cover that does not become too tightly closed by its own weight when the cover is closed.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a holding means for an opening / closing mechanism of a document cover is provided, and when the cover is closed, the document is held at an intermediate position. It is possible to hold.

According to a second aspect of the present invention, in order to achieve the above object, in the first aspect of the present invention, the original cover support plate fixed on the original placing table has an open inner curved portion at an upper portion thereof, and a side surface of the original cover. When the attached support pins enter and the document is set and the document cover is tightened, the support pins are closed by a certain angle from the open position, and the support pins are caught by the projections of the internal curved portion of the top cover provided on the document cover support plate. After the movement stops, the document cover is pulled up to the front and the support pin is released from being caught by the projection provided on the document cover support plate, and then is rotated to the closed position to have a mechanism for closing the document cover. .

On the other hand, when opening from the closed position, there is no need to stop halfway, so the document cover can be opened at a stretch without being caught and stopped halfway. The document cover can be easily removed by lifting the document cover in a state perpendicular to the document table, and can be replaced with a cover according to the thickness of the document.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is a perspective view showing an external configuration of a large-sized copying machine capable of copying up to A0 size according to an embodiment of the present invention. In a machine for copying a large document such as an A0 size document, as described above, the document is conveyed from the front of the machine, the document surface is exposed and scanned by a fixed optical system, and an image is formed based on the exposure. Further, a plurality of roll sheets wound in a roll shape as a sheet feeding unit are accommodated in a portion below the center in the height direction.

Referring to FIG. 2, the configuration of the machine and image formation will be described. The copier body 1 is provided with caster wheels 2 at the bottom so that it can move freely.
A document cover 10 provided with a transport roller for transporting the document 9 along a document transport path 41 formed on the upper surface of the copier main body 1 is provided at an upper portion of the main body of the copier 1 described later. The document cover support plate is provided so as to be freely opened and closed. A discharge port 54 for discharging the sheet on which the toner image has been transferred is opened on the front surface 1a of the copying machine body 1. The sheet discharged from this discharge port is guided by the guide member 91 with the front end facing downward. And is successively accommodated in the pocket 92 formed by the front cover 5 along the entire surface 1a of the copying machine main body 1 through the introduction opening 93.

Next, an image forming process in the copying machine will be described. After the photosensitive drum 20 is uniformly charged by the charging corona discharger 21, the light source 17
As a result, the reflected light applied to the surface of the original 9 through the transparent plate 13 passes through the selfoc lens 18 and is applied.
As a result, an electrostatic latent image corresponding to the original image is formed on the exposed photoconductor.

The electrostatic latent image is visualized into a toner image by a developing device 22, and the toner image is guided to a transfer corona discharger 24 by rotating the photosensitive drum 20 in the direction of an arrow 23, and is conveyed to a transfer path. D1, D2, D3, and D4 transfer to the sheet 4 guided to the photoconductor 20, are separated from the photoconductor drum 20 by discharge in the corona discharger 25 for separation, guided to the fixing device 35, and discharged. Will be accommodated.

Below the image forming section of the copying machine main body 1, a roll sheet 4A wound as a roll as a paper feeding section is provided.
4B and 4C are stored in three stages, and are cut at a predetermined timing by the cutter mechanism 80, so that a transfer sheet of a desired size can be fed.

The holding means in the embodiment of the present invention includes an inner curved portion 100A having an open top provided on the original cover supporting plate 100, projections 100B and 100C provided on the inner curved portion 100A having an open upper portion, and a side plate of the original cover 10. The original cover 10 is attached to the original cover 10A and the like, and the original cover 10 can be held when closed by the shape of the inner curved portion 100A that is open at the top and the shape of the original cover support pin 10A.

More specifically, an original curved portion 100A having an open top is formed on the original cover supporting plate 100, and projections 100 are formed on both left and right sides with respect to the center of the curved portion.
B and 100C are formed. The document cover support pins 10A provided on the document cover side plate are formed in an oval shape.

Next, the engagement state of the document cover 10 with the document cover supporting plate 100 and the opening / closing mechanism shown in the external perspective view of FIG. 1 will be described in detail with reference to FIGS. 4 and 5 to 8. . FIG. 4 shows an engaged state in which a document cover support pin 10A attached to the side of the document cover enters the document cover support plate 100 provided on the document placing portion 41 of the copying machine body 1 and the document cover 10 is attached. ing.

FIG. 5 shows a state in which the document cover 10 is at the maximum open position (105 ° in this embodiment), and the projection 1 provided on the internal curved portion 100A which is open at the top.
The original cover 10 is held at the maximum open position by the original cover support pin 10A being brought into contact with and fixed to 00B.

Next, FIG. 6 shows a state in which the document cover 10 is closed while being rotated about the document cover support pin 10A as a fulcrum, and is temporarily stopped. When the document cover 10 is closed, the document cover supporting pin 10A abuts on the left protrusion 100C provided on the inner curved portion 100A which is open at the top, so that the document cover is positioned at an intermediate position (in this embodiment,
60 °), but the inner curved portion 100 which is open at the top
An arbitrary angle can be set by changing the shapes of the protrusions 100B and 100C provided on A.

When the original is placed at a predetermined position and the original cover 10 is continuously closed to the closed position, the original cover 10 is temporarily lifted in the direction of the arrow in FIG. By turning off the left projection 100C provided on the left side, the document can be rotated again, and the document can be pressed at the closed position shown in FIG.

On the other hand, when the document cover 10 is opened from the closed position, the document cover support pins 10A can be rotated without being caught, and can be pulled up to the maximum open position at a stretch.

When replacing the original cover 10 having a different thickness of the original as described above from one corresponding to one sheet to one capable of accommodating a thicker one such as a book shown in FIG. 10 (book carrier). Document cover 1 as shown in FIG.
The document cover supporting pin 10A is pulled up in a state perpendicular to the document table so that the document cover supporting pin 10A is moved upward.
It is possible to remove the cover from the inner curved portion 100A having the upper opening formed at 0 and replace the cover.

Although the description of the embodiment of the present invention is as described above, the present invention is not limited to the above-described embodiment, and the original cover and the original cover supporting plate are connected to each other.
Two grooves are provided inside the document support plate through a connection point, and when the shaft connecting the machine body and the document cover support plate is fitted into one of the two grooves, the document cover is fully opened, It is also possible to apply various designs such as an opening / closing mechanism provided with a holding means for stopping at an intermediate position when it fits in one of the grooves.

[0022]

According to the present invention, by adopting a simple mounting mechanism for the document holding cover, it is possible to open the cover at a stretch when opening the cover, and to temporarily close the cover by its own weight so as not to be too tight when closing. A document cover excellent in safety and workability, in which the cover can be stopped and the cover can be easily replaced to accommodate documents of different thicknesses, was realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a copying machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically illustrating an internal structure of a copying machine according to one embodiment of the present invention.

FIG. 3 is a perspective view showing a copying machine according to an embodiment of the present invention when a document is inserted.

FIG. 4 is a sectional view showing a state in which the document cover is engaged with the document cover support plate according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of the copying machine according to the embodiment of the present invention in a state where a document cover is in a maximum open state.

FIG. 6 is a sectional view of the copying machine according to the embodiment of the present invention in a state where the document cover is stopped halfway;

FIG. 7 is a cross-sectional view of the copying machine according to the embodiment of the present invention when the document cover is pulled obliquely upward from a partially stopped state.

FIG. 8 is a cross-sectional view of the copier according to one embodiment of the present invention when a document cover is closed and a document is pressed.

FIG. 9 is a sectional view of the copying machine according to the embodiment of the present invention in a vertical state.

FIG. 10 is a sectional view of a book carrier.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Copier main body 2 Caster wheel 4A, 4B, 4C Roll sheet 5 Front cover 9 Document 10 Document cover 10A Document cover support pin 13 Transparent plate 17 Light source 18 Selfoc lens 20 Photoconductor drum 21 Charging corona discharger 22 Developing device 23 Drum rotation direction 24 Corona discharger for transfer 25 Corona discharger for peeling 35 Fixing device 41 Document table 80 Cutter mechanism 100 Document cover support plate 100A Internal curved portion of document cover support plate open at top 100B Document cover support plate top open 100C Left protrusion of the internal curved portion of the document cover support base that is open at the top

Claims (3)

[Claims] An image forming apparatus which is attached to a document placing portion of the image forming apparatus;
In a document cover that opens and closes rotatably around a fulcrum,
The document cover is characterized in that a holding means is provided which can be opened to a fully open position without stopping when opened from a closed position and temporarily stopped at an intermediate position between the fully opened position and the closed position when closed from a fully opened position. Opening and closing mechanism. 2. The image forming apparatus according to claim 1, wherein the holding means includes an inner curved portion having an open upper portion provided on the original cover supporting plate, a projection provided on the inner curved portion having the upper open portion, and an original cover supporting pin provided on a side plate of the original cover. 2. The document cover opening / closing mechanism according to claim 1, wherein: 3. The document cover opening / closing mechanism according to claim 1, wherein the image reading of the image forming apparatus is a document moving type.