JPS614080A - Copying machine - Google Patents

Abstract

PURPOSE:To simplify mechanism and reduce the size and cost of the copying machine by providing a switching means which changes the conveyance direction of a copying paper at the discharge side of a couple of rolls which conveys the copying paper after fixation, and copying plural images on one surface of the paper one over another. CONSTITUTION:When a color copy is taken, an inverter 5 is positioned as shown by a solid line by operating an operation button and then a copying paper is discharged from paper feeding devices 6 and 7 and fed to a photosensitive drum 8 through a conveyance path 9 to take a copy of the 1st color on one surface of the copying paper. Then, fixation is carried out by a fixing device 10 and the copying paper is sent from a feedback conveyance path 1 to a feed path 9 and sent to the photosensitive drum 8 again to take a copy of the 2nd color, thus completing copying operation through repetitive operation. The inverter 5 is displaced to a broken-line position after the color copying operation and a color body is discharged to a tray 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying machine, such as a color copying machine, that can copy multiple images in a superimposed manner on one side of copy paper, and particularly relates to a mechanism thereof. This invention relates to a copying machine that is simplified, smaller in size, and lower in cost.

[Conventional technology]

Conventionally, as shown in FIG. 4, a copying machine equipped with a color copying function has a black and white developer (c) and a color developer ( d) (dl (dl is installed and the paper feed device tel
Bias transfer rolls (fl) are known in which the toner image formed on the photosensitive drum (b) is transferred onto the copy paper by winding the copy paper fed from the copy paper. During color copying, the color toner images formed on the photosensitive drum fbl are sequentially transferred in register onto copy paper on a bias transfer roll (fl) and fixed by a fixing device (gl).

[Problem that the invention seeks to solve]

Therefore, in conventional copying machines of this type, a large bias transfer roll (fl) is required for winding the copy paper, and for transferring a plurality of color toner images in register onto the copy paper. This also requires a positioning mechanism, making the entire copying machine larger and more complex, resulting in a relatively high cost.

[Means and operations for solving the problems] An object of the present invention is to solve the two problems of conventional copying machines that are capable of copying multiple images on one side of copy paper. The object of the present invention is to provide a copying machine whose mechanism is simplified and whose size and cost are reduced.

That is, the present invention provides a feeding path for transporting copy paper from a paper feeding device to a photoreceptor, a discharge path for transporting copied copy paper from a fixing device to a tray, and a connection between these discharge paths and the feeding path. A copying machine equipped with a feedback conveyance path that communicates and connects the copy paper with a switching means for changing the conveyance direction of the copy paper on the discharge side of a pair of rolls that convey the copy paper in the fixing method. Then, this switching means feeds the single-sided copied copy paper to the feedback conveyance path, and transfers it to the photoreceptor via the feed path.
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'1WilC・This allows overlapping copies to be made, which simplifies the overlapping copying mechanism and downsizes the copying machine.
This is aimed at reducing costs.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. An inverter (5) is provided on the discharge side of transport rolls +31 to +41 provided between the transport path (1).

In other words, the copying machine of the present invention includes a paper feed device +61 +71 provided on one side of the main body/'%Using, and a feed path for conveying copy paper from the paper feed device (61+7+ to the photosensitive drum (8). (9), a paper tray from the fixing device (10) to an ejection path (2) that conveys the copied copy paper to the tray (11), and a path between the ejection path (2) and the feeding path (9). It is composed of a feedback conveyance path (1) that communicates with the feedback conveyance path (1), and an inverter (5) disposed on the discharge side of the conveyance rolls +31 +41 provided between the discharge path (2) and the feedback conveyance path (1). ing.

In addition, the inverter (5) has an operation button (not shown).
The υ solenoid (not shown) is activated by the signal from the
In the case of overlapping copying such as color copying, it is configured to move to the position shown by the solid line, and in the case of normal single-sided copying, it is moved to the position shown by the broken line.

In Figure 1, (12+13) is the paper feeder f61 +7
), or the single-sided copying cylinder copy paper re-fed from the feedback conveyance path (1) indicated in "-", the progress of the copy paper is temporarily stopped and the toner image on the photosensitive drum (8) is removed. It shows the registration rolls used for alignment.

To make a color copy using this copying machine, operate the operation button described above to displace the inverter (5) to the position shown by the solid line as shown in FIG.
The copy paper is ejected from H71 and fed to the photosensitive drum (8) via the feeding path (9) to copy the first color onto one side of the copy paper.

Next, this copy paper is fixed in the fixing device (10), then sent from the feedback conveyance path (1) to the feed path (9), and sent again to the photosensitive drum (8) to make a second color copy. , and the following steps are repeated sequentially to obtain a color copy.

After color copying is completed, the inverter (5) is moved to the position indicated by the broken line, and the color copy is discharged to the paper tray (11).

In this way, this copying machine ζ has a copy paper feed path (9), a discharge path (2), and a feedback conveyance path (1).
) is circulated and re-transmitted to the photosensitive drum (8) multiple times for overlapping copying, so it is possible to omit the bias transfer roll that was required in conventional copying machines of this type. Moreover, the registration of the overlapping toner onto the copy paper can be performed using a registration roll (12+ +131) for single-sided copying, and the alignment mechanism can be simplified, making the copying machine more compact and cost-effective. It is possible to aim for

Further, FIG. 2 shows another embodiment of the present invention.
In place of the paper feeding device (6) of the copying machine shown in the figure, a double-sided copying tray (14) is installed in the feedback conveyance path (1).
It is equipped with a double-sided copying mechanism in addition to a stack copying mechanism.

That is, as shown in FIG. 2, on the front side of the double-sided copy tray (14), a single-sided copy paper is carried into this tray (1Φ), and a feedback conveyance path (
A drive roll (15) and pinch rolls (161+17) are disposed to discharge the drive roll (15) and pinch roll (16) to is disposed above the double-sided copying tray (14), and a paper feed paddle (made of rubber or the like) that rotates in the direction of the arrow around the base end (19) is disposed on the upper side of the double-sided copying tray (14). 4)) are provided.

To make a color copy using this copying machine, operate the operation button to displace the second inverter (5) and the second inverter (18) to the position shown by the solid line as shown in FIG. Similar to the copying machine shown in FIG. 1, copy paper is circulated.

On the other hand, to make double-sided copies, after displacing the inverter (5) to the position shown by the solid line and the second inverter (18) to the position shown by the broken line, the copy paper is ejected from the paper feeder (7). The copy paper is fed to the photosensitive drum (8) via the feed path (9) (a copy is first made on the front side of the copy paper, and the copy paper with the front side copied is transported by the feedback conveyance path (1) to the above-mentioned drive). The paper is temporarily stored in the double-sided copying tray (14) from the roll (15) and the pinch roll (16).

Next, the paddle (2o) on the paper tray (14) is rotated as shown in FIG. 3 to reverse the conveying direction of the copy paper with the front side copied, thereby reversing the front and back sides and feeding it forward; and the feedback conveyance path (1) from the drive roll (15) and the pinch roll (17).
The paper is fed into the feeding path (9) via the photosensitive drum (8), where it is copied onto the back side of the copy paper whose front side has been copied, and then passed through the fixing device (10) and sent out from the ejection path (2). The receiver is for discharging the paper onto a tray (11) to obtain a double-sided copy.

In both of the copying machines described above, in order to obtain a single-sided monochromatic copy, the inverter (5) in the copying machine shown in FIG. 1 is moved to the position of the grinding line, and in the copying machine shown in FIG. , can be obtained by performing a copying operation by displacing the inverter (5) to the position shown by the broken line and the second inverter to the position shown by the solid line.

〔Effect of the invention〕

As described above, the present invention provides a copying machine equipped with a feeding path, an ejection path, and a feedback conveyance path, in which a pair of rolls for conveying the fixed copy paper is placed on the discharge side in the conveyance direction of the copy paper. The switching means circulates the single-sided copied copy paper through the feeding path, ejection path, and feedback conveyance path, thereby causing it to be re-transmitted to the photoreceptor multiple times for overlapping copying. It is something that can be done.

Therefore, compared to conventional copying machines of this type, the overlapping copying mechanism can be significantly simplified, and the practical effects of the present invention are great, such as making the copying machine smaller and lower in cost. .

[Brief explanation of the drawing]

1 to 8 show embodiments of the present invention.
2 is a detailed explanatory diagram of the present invention, FIG. 2 is an explanatory diagram of a copying machine according to another embodiment, FIG. 3 is a partially enlarged view of the double-sided copying tray, and FIG. 4 is a conventional FIG. 2 is an explanatory diagram of a color copying machine. [Code explanation]

Claims (1)

[Claims] a feeding path that transports copy paper from the paper feeding device to the photoreceptor;
In a copying machine equipped with an ejection path for transporting copied copy paper from a fixing device to a paper receiving tray, and a feedback transport path that communicates and connects the ejection path and the feeding path,
A copying machine characterized in that a switching means for changing the conveyance direction of the copy paper is provided on the discharge side of a pair of rolls for conveying the fixed copy paper.