JPH0486754A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate carrying fault or image forming fault of a long sized original by providing a platen sheet operating means separating a platen sheet from an original platen synchronized with feeding and ejecting of the long length original in an original cover, and providing an extracting direction restricting member of the long sized original in the front edge part of the device. CONSTITUTION:The original cover 14 on which the long sized original 17 is mounted is constructed by the platen sheet 14b being contained to a box 14a, and the platen sheet 14b, which is openable/closable through a hinge, is separated from the original platen 12 in a vertical direction synchronized with feeding and ejecting of the long sized original 17. The guide 14p of an arch shape is installed in the width direction of the front edge part of the original cover 14 as the extracting direction restricting member of the long length original, the long length original 17 is once lifted up by this guide 14p, then guided, and carried to the space between the original platen 12 and the original cover 14 and to a tractor unit 123. Thus, failure of carrying due to paper jamming, failure o image formation due to receiving exposure in a folded state are solved, and the image can be formed at high efficiency and high precision.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to an image forming apparatus capable of forming an image on a long original, and more specifically, the present invention relates to an image forming apparatus capable of forming an image on a long original. The present invention relates to an image forming apparatus that can form images with high efficiency and precision without causing any problems.

(Prior Art) Conventional image forming apparatuses, such as copying machines, can perform continuous copying of ordinary originals that can be handled one by one with extremely high efficiency. In the case of manuscripts, continuous copying is difficult and the copying efficiency is poor.

However, recently, image forming apparatuses that can process long originals with high efficiency have been developed and put into practical use.

That is, FIG. 12 is a perspective explanatory view of a long original supply unit 120 in an image forming apparatus having the above-mentioned functions.

20 The long document supply unit 120 includes a pair of left and right side guides 122 provided on the top surface of the document cover 14, and a main body 1.
The tractor unit 123 is provided at the rear of the tractor unit 123.

The left and right side guides 122 are configured such that the left and right spacing can be freely adjusted.

Further, as shown in FIG. 13, the document cover 14 has a platen sheet 14b housed in a housing 14a forming an outer shell, and can be opened and closed by a lever (not shown), and can cover a long document 17. Platen sheet 1 in synchronization with supply and discharge
4b is separated from the document table 12.

As shown in FIG. 14, the long original 17 is a Z sheet that can be folded and stacked, has feeding holes on both sides, and is positioned and placed on the original cover 14 by left and right side guides 122. is inserted in the direction of arrow A from between the document cover 14 and the document table, and the tractor unit 123
and is discharged in the direction of arrow B.

(Problems to be Solved by the Invention) The image forming apparatus configured as described above has the advantage of being able to process long originals with high efficiency, but when feeding long originals, it is especially difficult to place the long originals on the original cover 14. When there are only a few remaining long sheets left, the folded long originals 17 are conveyed as they are without being separated, causing a paper jam and impeding operational efficiency.

That is, the process of conveying a long document is as shown in FIGS. 15 to 17. First, the long document 17 is set on the document cover 14 as shown in FIG.
After positioning in step 2, place the leading edge of the long document 17 on the document table 12.
and the document cover 14, and then set the exposed portion on the tractor unit 123.

As shown in FIG. 16, during exposure, the platen sheet 14b of the document cover 14 descends and comes into pressure contact with the long document 17, and while the long document 17 is being conveyed, the platen sheet 14b
b is separated from the document table 12.

In this way, exposure and conveyance of the long original 17 are repeated continuously, and when the amount of the long original 17 remaining on the original cover 14 becomes small as shown in FIG. 17, as shown in FIG. Since the long document 17 is pulled almost parallel to the document cover 14 with respect to its take-out direction, the long document is not separated one page at a time, but is in a state 17- in which several pages are folded, and the document table 12 and the document It will be sent to the gap with the cover 14.

If such a situation occurs, the long paper 17 will fall onto the document table 12.
There has been a problem in that paper jams occur in the gap between the document cover 14 and the document cover 14, making it impossible to convey the document, or inability to form an image if the document is exposed to light in a folded state.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional image forming apparatus.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image forming apparatus that can form images with high efficiency and precision without causing problems in transporting long originals or in image formation.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, an image forming apparatus of the present invention includes a document table, a document cover that covers the document table in an openable and closable manner, and a document cover on the document table. a document supply means for supplying and discharging a long document;
In an image forming apparatus that includes an exposure scanning device that guides an image of a supplied document and an image forming device that forms an image on an image carrier using this image, the document cover is attached to a platen in synchronization with the feeding and ejection of a long document. The apparatus is characterized in that it has a platen sheet operating means for separating the sheet from the document table, and also has a elongate document removal direction regulating member at the front end of the device.

(Function) The image forming apparatus of the present invention has a guide provided at the front end of the document cover to temporarily lift up a long document to be taken out in the direction in which the long document is taken out, or a guide that temporarily lifts the long document to be taken out in the direction in which the bottom of the long document is taken out. Since a long document ejecting direction regulating member consisting of a protruding stopper to prevent the document from being pulled is provided, the amount of long originals that are guided and conveyed by this ejecting direction regulating member is reduced to the remaining amount on the document cover. Even in this case, the direction of take-out is never parallel to the document cover.

Therefore, long documents are accurately separated one page at a time and pulled in the take-out direction, so they are not sent into the gap between the document table and document cover in a state of being folded several times, which may cause paper jams or other unfeasible conveyance. This effectively eliminates problems such as the inability to form images due to exposure in a folded state, and allows images to be formed with high efficiency and precision.

(Embodiment) Hereinafter, an embodiment of the image forming apparatus of the present invention will be described in detail with reference to the drawings.

First, as shown in FIG. 1, the image forming apparatus of this embodiment includes a main body 1, an original supply mechanism 11, and an exposure scanning means
, paper feeding means 31 , image forming means 41 , and paper discharging means 5
1 and a control means (not shown).

In this embodiment, the parts other than the original supplying means 15 in the original supplying mechanism 11 are the same as those of the conventional one, so after an outline of the similar parts will be explained, the original supplying means 15 will be explained in detail.

The main body 1 accommodates each part, and has openings at the upper end and lower left and right sides, and the upper front part is equipped with a copy key, a sheet quantity setting key, and other input keys and displays necessary for operations. An operation panel 2 is provided.

The document supply mechanism 11 includes 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, a document cover 14 provided on the main body 1 so as to be openable and closable, and a document table 12 made of a glass plate that covers the upper opening of the main body. It has a supply means 15, and a document cover 14 holds a document 17 placed on a document table 12.

The document cover 14 has a platen sheet housed in a casing that forms an outer shell, and can be opened and closed by a lever (not shown), and separates the platen sheet from the document table in synchronization with the feeding and ejection of the long document 17. It has a platen sheet operating means (described later) for controlling the platen sheet.

The exposure scanning means 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 movable second carriage 24 having reflection mirrors 24a, 24b, an imaging lens 25, and reflection mirrors 26a, 26b, and 26c.

Then, as the first carriage 22 moves, the light source body 22a
When scanning the interrupted original 16 or long original 17 while irradiating it, the reflected light from either original 16 or 17 passes through the reflecting mirrors 24a and 24b of the second carriage 24, which moves at an appropriate speed. The light enters the imaging lens 25, illuminates the reflecting mirrors 26a, 26b, and 26c, and forms images of the originals 16 and 17 on the photosensitive drum 42.

The paper feeding means 31 supplies paper P as an image carrier, and includes a manual feed cassette 32 and cassettes 33 and 34, and a pickup roller 32 according to an external signal.
The paper P taken out appropriately by a, 33a, and 34a is
It reaches the aligning roller pair 35 via the feed separation roller pair 33b or 34b, and is sent to the photosensitive drum 42 at an appropriate time.

The image forming means 41 includes the above-mentioned rotating photoreceptor drum 42.
Developing devices 42a, 42b, a transfer device 42c1 and a peeling device 42d1 are arranged along the rotation direction on the outer periphery of this.
A cleaner 42e1, a static eliminator 42f, a main charger 42g, etc. are arranged. Further, a transport conveyor 43 and a pair of fixing conveyors 44 are provided, and the photosensitive drum 4 is
The latent image formed on the sheet P is visualized by the developing device 42a or 42b, transferred to the paper P by the transfer device 42c, peeled off by the peeling device 42d and conveyed, and heated and fixed by the fixing roller pair 44. and sent to the paper discharge means 51.

In the paper ejection means 51, the fixed paper P is transferred to the paper ejection roller pair 5.
2 and is stored in the paper discharge tray 53.

A paper discharge detector 54 is provided near the pair of paper discharge rollers 52 to detect the paper to be discharged.

The control means (not shown) consists of a control device equipped with a CPU.

This completes the general explanation of the overall structure and operation of this embodiment. Next, the document supply mechanism 11, which is an important component of this embodiment, will be explained.

As shown in FIG. 1, the document supply mechanism 11 includes a document table 12
, positioning scales 13a and 13b, and document cover 14
and a document supply means 15 consisting of an interrupt document supply unit 110 and a long document supply unit 120.

Here, the interrupt document supply unit 110 supplies the long document 1
This is provided as necessary to interrupt the process of step 7 by automatically feeding another document, and is not an essential condition of the present invention, so it will not be described in detail, but as shown in FIG. , is provided at one end on the right side when viewed from the operation panel 2 side, and the interrupt original is transferred from the original tray 111 to the original platen 12.
The paper passes between the document cover 14 and the document cover 14, and is discharged to the paper discharge tray 112.

As shown in FIG. 2, the long document supply unit 120 includes a pair of left and right side guides 122 provided on the top surface of the document cover 14, and a tractor unit 123 provided at the rear of the main body 1. .

The left and right side guides 122 are configured to have adjustable intervals, and their positions can be set according to the width of the long original 17.

FIG. 3 shows the long original supply unit 120 shown in FIG.
In contrast, it shows a state in which a long original 17 is set, and as is clear from the figure, the long original 17 used in the present invention is a Z paper that can be folded and stacked, and has feeding holes provided on both sides. This long original 17 passes between the original cover 14 and the original table 12 and is fed to a tractor unit 123, which will be described in detail later.

The structure of the document cover 14 on which the long document 17 is placed will be described later, but as shown in FIG. can be opened and closed via a hinge (not shown),
The platen sheet 14b is arranged to move away from the document table 12 in the vertical direction in synchronization with the supply and discharge of the long document 17.

In FIGS. 2 and 3, a torii-shaped guide 14p is provided in the width direction of the front end of the document cover 14 as a member for regulating the direction in which a long document is taken out. , the long original 1 to be taken out with respect to the taking out direction of the long original 17 placed on the original cover 14.
By lifting the document 7 and then guiding it to the gap between the document table 12 and the document cover 14 and transporting it to the tractor unit 123, even when the amount of long document 17 to be placed on the document cover 14 is low, it can be easily removed. This solves problems such as the unloading direction not being parallel to the document cover, making it impossible to transport due to paper jams, and the inability to form images due to exposure in the folded state.

That is, even if exposure and conveyance of the long original 17 are repeated in the state shown in FIG. 4, and the amount of the long original 17 placed on the long original 17 decreases, the folded portion 17g on the rear side of the long original 17 will remain as shown in FIG. As shown in , the guide 14p lifts the paper in the direction of the arrow and conveys it accurately.

Furthermore, as shown in FIG. 6, the front fold portion 17b of the long original 17 is lifted while being pulled back in the direction of arrow E by the guide 14p, so it is likely to peel off from the underlying long original, page by page. They are accurately separated and transported in the removal direction.

FIGS. 7 and 8 show other embodiments of the direction regulating member for this long document.

In FIGS. 7 and 8, a protruding stopper 144 is disposed in the width direction of the front end of the document cover 14 as a member for regulating the ejection direction of long originals, and this protruding stopper 14q , the bottom of the long original 17 placed on the original cover 14 is prevented from being pulled in the removal direction.

That is, as shown in FIG. 9, even when the amount of long originals 17 placed on the long originals 17 is reduced, the bottom front portion 17c of the long originals 17 is prevented from being pulled forward in parallel by the tractor unit 123. Therefore, there is no problem in which the long original 17 is pulled out in a state where several sheets are folded, and the long original 17 is accurately separated page by page and conveyed in the take-out direction.

As shown in FIG. 10, the document cover 14 is formed by housing a platen sheet 14b in a housing 14a forming an outer shell.

A shaft 14c is rotatably supported through the housing 14a, and levers 14d are fixed to both ends of the shaft 14c.

The tips of these levers 14d, 14d are connected to the platen sheet 1.
The platen sheet 14b is fitted into a long hole 14e provided in the platen sheet 4b, and the platen sheet 14b is pressed downward by a spring 14f.

Such a mechanism is also provided at the left end of the document cover 14, and the tips of the front and rear levers 14d114d are connected by connecting rods 14h, 14h to form a parallel link.

A receiver member 14g is attached to the tip of one of the levers 14d1, and when this is pushed up by a push-up member (not shown), the four levers 14d. ... rotates counterclockwise, and the platen sheet 14b is separated from the document table 12.

Note that the shaft 14c lever 14d, spring 14f1 holder are connected to the platen sheet operating means 14 by members 14g1 and connecting rod 14h.
k.

With the above configuration, the platen sheet 14b presses the document table 12 in synchronization with the supply and discharge of the long document 17, that is, during exposure, and presses the document table 12 when conveying the document 17.
It is designed to be separated from the

The rear end of the document cover 14 can be opened and closed via a hinge (not shown).

As shown in FIG. 11(a), the tractor unit 123 includes a bin tractor 124 consisting of a pair of pin belts 124a, 124a, and a tractor drive means 125 for driving the bin tractor 124, and is positioned and fixed to the main body 1. The long original 17 is fed one pitch at a time by a bin tractor 124 each time exposure is completed.

The tractor drive means 125 has a pulse motor 126, and its rotation drives a drive shaft 127a of the bin tractor 124 via a feed clutch 127, which is a one-way clutch, by belt transmission.

Although not shown, the pulse motor 126 is connected to a worm reducer via a cam clutch consisting of a one-way clutch, and the rotation of a switch cam attached to this camshaft is controlled via the platen upper and lower cams and a push-up lever. The above-mentioned receiver of the document cover 14 is interlocked with the member 14g,
The receiver can be configured to separate the platen sheet 14b from the document table 12 by pushing up the member 14g.

Note that the bin tractor 124 is provided with a pair of long document holding members 124b, and as shown in FIG. 11(b), one of the long document holding members 124b is Set reference mark 12 to align the leading edge of the page
4c, the initial certification operation of exposing the first page of a long document and then setting the second page on the tractor unit 123 can be easily and reliably performed.

That is, as shown in FIG. 11(c), the long original 1
A reference mark 17a is placed in the track hole on both sides at the tip of 7.
, and place this mark on the long document holding member 12.
If the above-mentioned initial recognition operation is performed in conjunction with the setting reference mark 124c of 4b, the operator can confirm the setting position at the same time as setting the long original 17, which not only prevents malfunctions but also reduces the length per page. It is also possible to set pages whose size is different from that of other parts.

This concludes the description of the embodiment.

In this embodiment, a Z-shaped paper is used as the long original 17, but the paper is not limited to this, and may be wound into a roll.

Therefore, the document supply unit 120 is not limited to the embodiment.

[Effects of the Invention] As explained in detail above, the image forming apparatus of the present invention has the following features:
At the front end of the device on the document cover, there is a guide that temporarily lifts the long document to be taken out in the direction of taking out the long document, or a protruding stopper that prevents the bottom of the long document from being pulled in the direction of taking out the long document. Since a long document ejection direction regulating member is provided, the ejecting direction of the long document guided and conveyed by this ejection direction regulating member will be parallel to the document cover even if there is little remaining on the document cover. It never becomes.

Therefore, long documents are accurately separated one page at a time and pulled in the take-out direction, so they are not sent into the gap between the document table and document cover in a state of being folded several times, which may cause paper jams or other unfeasible conveyance. This effectively eliminates problems such as the inability to form images due to exposure in a folded state, making it possible to form images with high efficiency and precision.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the image forming apparatus of the present invention, FIG. 2 is a perspective view of the upper part of a long original supply unit, and FIG. 3 is a long original feeding unit. Upper external perspective view showing the set state, Figures 4 to 6
The figure is a sectional view of the top of the long original supply unit, FIG. 7 is a perspective view of the upper part showing another embodiment of the long original supply unit, and FIG. 8 is a long original set in the long original supply unit. FIG. 9 is a sectional view of the top of the long document supply unit, FIG. 10 is a sectional view of the main part of the document cover, and FIG. 11(a) is a perspective view of the tractor unit. FIG. 11(b) is an enlarged perspective view of the long document holding member in FIG. 11(a), and FIG. 11(c)
is a plan view of the leading edge of a long document, FIG. 12 is a perspective view of the upper part of a long document supply unit in a conventional image forming apparatus, FIG. 13 is a sectional view of the top, and FIG. FIGS. 15 to 17 are sectional views of the upper part showing a state in which a long document is being conveyed.

Claims (3)

[Claims] (1) A document table, a document cover that covers the document table in an openable and closable manner, a document supply means for supplying and discharging a long document onto the document table, an exposure scanning means for guiding an image of the supplied document; In an image forming apparatus having an image forming means for forming an image on an image carrier using an image, the document cover has a platen sheet operating means for separating the platen sheet from the document table in synchronization with supply and discharge of the long document; An image forming apparatus comprising: a long original document removal direction regulating member at a front end of the apparatus. (2) Claim (1) characterized in that the elongated document take-out direction regulating member comprises a guide that temporarily lifts the elongated document to be taken out with respect to the ejecting direction of the long document placed on the document cover. ). (3) A claim characterized in that the elongated document removal direction regulating member comprises a stopper with a protrusion that prevents the bottom of the elongated document placed on the document cover from being pulled in the ejection direction. The image forming apparatus according to (1).