JPS5854352A - Image forming device - Google Patents

Abstract

PURPOSE:To perform automatically the double copy of less jam, by providing a resupply carrying path, through which a transfer paper to which an image is transferred is supplied again to a transfer part and providing a transfer face converting part in the course of this carrying path. CONSTITUTION:A transfer paper P to which an image is transferred in a fixing device 16 is sent to a resupply carrying path 20 through a transfer face converting part 22 by a distributing mechanism 21. The transfer paper P which has the face, where the image is already transferred, turned up in the transfer face converting part 22 provided in the carrying path 20 is accumulated on an accumulating plate 23, and an image is transferred again to the transfer paper P, and thus, the double copy of less jam is automatically performed because the transfer paper is not bent steeply.

Description

[Detailed Description of the Invention] The present invention provides a 1f image that enables sober copying to be performed intentionally.
Regarding lili & forming device.

Conventionally, three types of this Yuzu apparatus have been considered, which are constructed as shown in FIGS. 1 and 2. That is,
In this case, a paper feed section C is provided at the lower part of one side of the main body layer, and a paper discharge section C is provided above it. At the time of double-sided copying, a double-sided copying cassette (e) is installed in place of the paper feed force sensor ()d in the paper feed section, which receives the transfer paper P with one-sided copies already ejected from the paper output section C, and transfers it. After changing the side, the paper is fed from the paper feeder again.

However, in this device, since the paper feed section and the paper discharge section C are provided on the same side of the main body l, the transfer paper r fed from the paper feed section to the transfer section f is transferred to the photoreceptor g. After the developer image is transferred from the photoreceptor g in an electrostatically attracted state, it is peeled off from the photoreceptor g and is turned to a courier by a turn roller h and sent to the paper delivery section C. It has the disadvantage that it tends to jam.

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to provide an image forming apparatus that can automatically perform screen copying and that does not cause paper jams.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 to 11. FIG. 3 shows a copying machine M as an image forming apparatus lIt, where l is a copying machine main body. This copying machine main unit is the main unit that is normally used.
and an additional unit 3 which is used by being added to the double-sided copy temporary main unit 2, and are configured to be separable as shown in FIG. Note that 4 is a stand on which the copying machine main body l is placed.

A document mounting table 5 is provided on the upper surface of the main unit 2, and a photoreceptor 6 serving as an image carrier that rotates in a predetermined direction is pivotally supported within the main unit 2. A movable total optical system 2 is provided between the photoreceptor 6 and the original table 5.
) also irradiates the document placed on the device stand 5, and guides the reflected light to the photoreceptor 6 to form an image of the document. From this image forming position, the developing device 8, transfer device 9, cleaning device IO, and magnetizing device are arranged in order along the rotational direction of the photoreceptor 6.
, t t are arranged.

Further, at the bottom of the main unit 2, there is provided a transport path 13 for the transfer paper P passing through a transfer section j2 formed between the photoreceptor 6 and the transfer device ikg. 2 are connected via a fixing device 16 to a fed paper discharge section 15 provided on one side of the paper. The paper feed section 14
A first and a second paper feeder (ty, tg) are detachably installed in the cassette 77, tg, so that the transfer paper P can be fed independently from these cassettes 77, 18. Also,
A pair of paper discharge trays 19 are arranged in the paper discharge section 15 . Further, the transport path 13 is provided with a distribution mechanism 2 for distributing the transfer paper P that has passed through the fixing device mzs to a re-supply transport path 20, which will be described later, for double-sided copying.

The L additional unit 3 is removably connected to the lower side of the main unit 2, and includes the sorting machine! It has a re-supply conveyance path 20 that re-supplies the transfer paper P sorted from the conveyance path 13 by f421 to the transfer section 12, and a transfer surface conversion g22 provided at a portion of this re-supply conveyance path 20. The transfer surface conversion section 22 relatively converts the transfer surface P of the transfer paper P conveyed by the re-supply conveyance path 20, and is provided on the paper discharge section 15 side of the copying machine main body l, and is shown in FIGS. It is also shown in FIG. That is, reference numeral 23 is an integrated plate whose one end is rotatably supported, and on two adjacent sides thereof, first and second motors 24 such as pulse motors are installed.
The first. and $2 alignment tHz6. :zy is installed in the same place as the above-mentioned stacking board 23. Then, the conveyance path 13 is
from wll and the second (2) feed roller 2I.
Transfer paper P with single-sided copies carried in via I, 29
The sheets of paper P are stacked one after another on the stacking plate 23 with the copied transfer surface facing upward, and then roughly aligned by the first and second alignment plates 26.2; The peeling claw 30 presses the topmost transfer paper P against the second feed roller 29.
14 so that it is carried out from the rear end side while being concealed. The re-supply conveyance path 20 conveys the transfer paper P, which has been sent out from the transfer stack 1 cross section 22 with the copied transfer surface facing upward, so as to make a U-turn and merge it into the base end side of the conveyance path 13. It has become.

Therefore, when performing double-sided copying, first the transfer paper P fed from the first or second paper cassette) 77.7 &
The developer image is transferred from the photoconductor 6 to the fixing device 16 in the transfer section 12 as it is transported along the transport path 13.
It will be established in Then, it is distributed from the conveyance path 13 to the re-supply conveyance path 2U by the distribution P& mechanism 21, and then entered into the transfer surface conversion section 22. If multiple double-sided copies are to be attached, the above steps are repeated for the number of copies.

Then, when a predetermined amount of transfer papers P... are accumulated on the accumulation plate 23, these transfer papers P... are transferred to the first and second alignment plates 2.
6.27, and then the stacking plate 23 presses the feed rollers ``29'' of part-1 and sends them out in order from the topmost one and from the rear end of the conveyance, that is, after changing the transfer surface. The sent-out transfer paper P joins the base end side of the conveyance path 18, and as it is conveyed along this conveyance path 13, it is transferred to the transfer section 1 again.
2, where the developer image is transferred from the photoreceptor 6 to the other surface that has not been transferred, and then to the fixing device t 6 ,
From the paper output unit 15 to the paper output tray 1 through the sorting mechanism 21
The paper is ejected to 9.

In this way, by providing the resupply conveyance path 20 and the transfer surface conversion mzz, double-sided copying can be performed automatically.

Further, the conveyance path 13 transports the transfer paper P fed from a paper feed section 14 provided on one side of the copying machine main body l via the transfer section 12 to a paper discharge section provided on the other side of the copying machine main body l. 15, there are no sharp bends and jams are less likely to occur.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and may be configured, for example, as shown in FIG. 12.

That is, the transfer surface conversion section 22 is provided on the copying machine main body 10) paper feed section l- side, and the transfer paper P, which has already been copied on one side and which has been sorted from the conveyance path 13, is U-turned by the re-supply conveyance path 20 and transferred to the copied transfer section. The transfer sheet P, which has been sent out from the transfer conversion unit 22 with the copied transfer surface facing downward, is transferred to the base end side of the conveyance path 13 in this state. By configuring it in this way, not only the same effect as the above embodiment can be obtained, but also the transfer direction of the uncopied transfer paper P in the transfer surface conversion @ 22 is changed to the second direction. ) Since the paper can be sent out by pressing it against the roller 29, there is no risk of staining in the transfer direction, and the distance of the resupply conveyance path 20 from the transfer surface converting section 22 to the conveyance path 13 can be shortened. It is easy to time the paper feed. Note that the same components as those in the above embodiment are given the same reference numerals, and the description thereof will be omitted.

As explained above, according to the present invention, the image is transferred from the image carrier to the transfer paper fed from one side of the apparatus main body in the transfer section, and the transfer paper is ejected to the other side of the apparatus main body. A re-supply conveyance path that re-supplies the transfer paper on which the image has been transferred in the transfer section to the transfer section, and a transfer conveyance path that is provided in the middle of this re-supply conveyance path and is conveyed. Equipped with a transfer surface conversion section that changes the transfer direction of the paper, you can automatically make double-sided copies! − It has excellent effects such as jamming and sagging.

[Brief explanation of drawings]

1 and 2 show a conventional embodiment, and FIG. 1 shows a case where one-sided copying is performed. - Figure 11 shows an embodiment of the present invention, the third factor is a schematic configuration diagram, and Figure 4 shows a state in which the units are separated.
FIG. 5 is a perspective view showing the transfer surface conversion section, FIG. 6 is a perspective view showing the first alignment plate, FIG. 7 is a perspective view showing the $2 alignment plate, and FIG. 8 is a perspective view showing the transfer surface conversion unit. Figure 9 is a side view showing how the transfer paper is placed on the transfer surface converting section. #! FIG. 10 is a plan view as well, FIG. 11 is a side view showing a state in which transfer paper is sent out from the transfer surface converting section, and FIG. 12 is a schematic diagram showing another embodiment of the present invention. FIG. l...Device main body (copying machine main body), 6...Image carrier (
photoreceptor), 12... transfer section, 20... re-supply conveyance path, 22... transfer th+conversion section, P... transfer paper. Figure 5 Figure 6 JJr1 figure Age 8 figure jF9 figure

Claims (1)

[Claims] In an apparatus in which a transfer unit transfers one image from an image carrier to a transfer paper fed directly from one side of the main body of the apparatus, and the transfer paper is discharged to the other end of the main body of the apparatus, the above-mentioned transfer a re-supply conveyance path for supplying the transfer paper onto which an image has been transferred in the transfer section in a warped manner to the transfer section;
An image forming apparatus characterized by comprising a transfer surface converting section υ4 that interposes the transfer surface of the transferred transfer paper.