JPS6172276A - Picture forming device - Google Patents

Abstract

PURPOSE:To miniaturize the titled device and to form pictures on both sides and also a multiple picture on one side by sending forms accumulated in a temporary accumulating section to a picture forming section in the body of the device by a carrying means to form pictures on both sides, reversing again selectively the form carried by a carrying means for reversing and guiding to a picture forming section. CONSTITUTION:When copying on both sides of a form P, the gate 25 in a carrying unit 24 is turned as shown by a broken line, and the form P having a picture formed on one side and discharged is guided by the gate 25 in the direction shown by arrow mark of broken line,and put in a cassette 32. Then, rollers 49, 56 are descended, and the roller 49 is brought into rolling contact with a roller 51. A roller 56 comes into rolling contact with the form P in a cassette 41 and rotates to send out the form P. The form P is guided along a guide plate 39, and sent to a resist roller 36 in the body 1 with another side facing upward. The position of the form P is adjusted by the resist roller 36 and sent again to between the photosensitive drum 2 and a transfer charger 5a, and the picture is copied on another side and discharged from a paper discharge roller 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus used, for example, as a copying machine.

[Technical background of the invention and m points therebetween]

In general, a Shigeko copying machine places the electrostatic m number tone form 5!4 L of the original directly opposite the 0 body, and places the present 1 on it, f, 3.
By supplying agent 1, an image is formed by forming agent 1 and agent 1, and then transferring this onto paper by the action of a transfer charter to form an image.

Incidentally, in recent years, a double-sided copying machine has been developed in which the numbers are formed not only on one side of the paper but also on the other side.

However, in the past, the mechanism for single-sided copying was built into the main body of the copying machine, which led to the inconvenience of increasing the size and cost of the entire apparatus.

[Purpose of the invention]

The present invention was developed in view of the above circumstances, and its purpose is to enable miniaturization.

Moreover, it is an object of the present invention to provide an image forming apparatus which is capable of forming not only double-sided images but also multiple strokes on one side.

[Summary of the invention]

In order to achieve the above object, the present invention uses an image forming section to form an image on one side of a sheet fed from a paper feeding section at one end of the apparatus main body.
! In a device that forms a J image and then discharges it to the paper discharge section at the other end, the paper that is discharged from the paper discharge section to the outside of the apparatus main body and which has already received the image on one side is reversed to the paper feed section side. A conveying means for conveying is provided, the sheets carried out from the conveying means are temporarily accumulated in a temporary accumulation section, and the accumulated sheets are sent to the image forming section of the apparatus main body by the feeding means, so that the other side of the paper is An image is formed on one side of the sheet, and multiple images are formed on one side of the sheet by inverting and guiding the sheet conveyed by the conveying means to an image forming section of the main body of the apparatus by means of a guiding means.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. 1 in the figure is the main body of the electronic copying machine, and the central part of this main body IP'9 is lI! ! 1. A photosensitive drum 2 serving as an image forming section is rotatably provided, and chargers 3. Developing device 4, transfer and peeling chart 5a,
5b and cleaner 6 are installed. Further, upper and lower paper feed cassettes 7.8 are disposed as a paper feed section on one lower side of the main body l, and upper and lower feed rollers 9 are fed from these paper feed cassettes 7.8. , 10, the paper P is fed out one by one, and this paper P is conveyed along the conveyance path 1. In the conveyance path 11, feed rows 21 are sequentially arranged along the conveyance direction of the paper P.
2. Reno Strolla 36. Above transcription, stripped door chart
A +5 bhk feed belt l 3 , a constant M device 14 and a paper discharge row 215 are provided.

Further, an original table 16 on which an original is placed is provided on the upper surface of the main body l, and an optical system 1 is provided on the lower side of this original table 16.
7 is provided. This optical system 17 includes a lamp 18. It is composed of first to third mirrors 19, 20, 21, a lens 22, and a fourth mirror 23, and scans the light to the rung 18 and the reflected light to the first to third mirrors.
mirrors 19, 20, 21. The photosensitive drum 2 is irradiated with the light through the lens 22 and the fourth mirror 23 to form an electrostatic potential corresponding to the original.

When one image is formed, light is scanned by the optical system on the document placed on the document table 16vC, and the reflected light is transmitted to the first to third mirrors 19, 20, 21, lens 22, . The photosensitive drum 2 is fully irradiated through the fourth mirror 23, and the electrostatic charge of the document is formed on the bottom surface of the container 3, which is uniformly charged. This static image is made visible by applying a developer in the developing device 4.
The hydrated water is sent to the transfer charter 5a side. On the other hand, at this time, the paper P is completely supplied from either of the paper feed cassettes 7.
After being sent to and aligned, the photosensitive drum 2 and transfer charter 5a are sent to mj. Here&transfer chart 5a
As a result, the image on the photosensitive drum 2 is transferred to one side of the paper P, and after being completely peeled off from the photosensitive drum 2 by the action of the peeling charter 5b, it is sent to the fixing device 14 via the conveyor belt 13, where it is transferred to the fixing device 14 via the conveyor belt 13. The image on the paper P is scattered and ejected from the ejection roller 15.

On the other hand, a face/feed unit 24 is detachably provided on the bottom of the main body 1. A gate 25 and a discharge roller 26 are disposed inside a portion of the main body of the conveying unit 24 that faces the paper discharge roller 15 side. nI
The guide 25 is not shown in the figure, but is rotated once by a drive mechanism (not shown) to selectively move the FcP to be discharged from the paper discharge roller 15 as shown by the arrow. Furthermore, a conveying path 27 is provided inside the kl feeding unit 24, and this string feeding path 27 connects a pair of rows 228°28 arranged apart from each other and these rollers 2B, 28.
The bottom of the groove is formed by a conveyor belt 29 running on the conveyor belt 29 and a plurality of rollers 30 disposed in rolling contact with the upper surface of the conveyor belt 29. Also.

On the discharge side of this conveyance path 27, the paper P conveyed from the nine conveyance path 27 is temporarily collected. A stacking section 32 is provided, and a feeding means 33 for sending out the sheets P accumulated in the temporary stacking section 32VC is also provided.

Further, a guide body 39 is rotatably provided between the terminal end of the conveyance path 27 and the temporary accumulation section 32. This guide body 39 is rotated by a driving means (not shown) to move its lower end forward and backward toward the discharge side of the conveyance path 27, and by moving the guide body 39, the sheets P sent from the temporary stacking section 32 are moved. The registration roller 36 is guided through an opening 37 formed at the bottom of the main body. Further, at the upper part of the near side of the terminal end of the conveyance path 27, there are a dart 38 and a guide 3 forming a guide means.
9 are arranged. The dart 38 is rotatably provided, and at the time of multiple copying, the paper Pt, which is rotated and conveyed as shown by a broken line by a driving means (not shown), is transferred from the opening J7 to the paper Pt by the guide 39. 3
6.

On the other hand, the temporary accumulation section 32 and the feeding means 33 are rented as shown in FIGS. 5 and 6. i.e. 1
In the figure, No. 4 is a cassette, and inside this cassette No. 4 there is provided a push-up plate 42 for pushing up the accumulated U&P, and one end of this push-up board 42 is connected to the lever 43
is being pushed up by Further, as shown in FIG. 5, 44 in the figure is a drive motor, and this drive motor 44 is connected to gear 4
5 and gears 46° and 47 VC are engaged with each other. The gear 46 is connected to a roller 49 via a shaft 48,
The gear 47 is connected to the roller 5 via a shaft 50. Further, a shaft 50 of the roller 5 is connected to the shaft 48 of the row 249 via a churn 52. Further, the roller 49 and the roller 56 are connected to the arm 5.
3, and the roller 5 rolls into contact with the paper Pvc due to its own weight. Furthermore, a one-way clutch 54 is installed inside each of the rows 249 and 56, so that force is transmitted only in the direction of the arrow.

On the other hand, the roller 5 and the gear 47 are connected via a spring clutch 56a, and rotate in a clockwise direction with respect to the row 249.

Further, the rows 249, 56 are provided to be able to move upwardly and downwardly, and when the sheet P to be carried out from the transport path 2771 is introduced by a drive mechanism (not shown), these rows 249, 56 are raised as shown by the broken line. Further, when sending out the paper P accumulated in the cassette 41, the roller 56 is lowered as shown by the solid line so that it rolls into contact with the paper P, and the roller 49 rolls into contact with the lower roller 5. It has become.

By the way, a spring clutch 56a is set between the upper i-pillow 249.5J and the gear 47 so that when the force at the roller contact point exceeds T, the spring clutch 56a will slip.
．． The frictional force between 51 and 51 is T.

Then, set stone and roller 5 so that T2>T%.
1 is adapted to rotate according to rollers 49.

Also, the frictional force between paper P and paper P is 'kTf.

If the frictional force between the roller 56 and the roller #:P is TFL, it is generally Ta)4'f since the row 256 is formed of a material with a high coefficient of friction such as rubber. and b
T is defined so that T">T+>Tf.

When the sheets P accumulated in the cassette 4 are fed, the lever 43 is operated as shown in FIG. Then, the roller 56 is rotated by the operation of the drive motor 44.
The paper P is rotated in the direction of the arrow and fed between the rollers 49 and 51. The fed paper Pl-1 is separated one by one between the rows 249 and 51 and sent out as shown in FIG. This is because, as shown in FIG. 9, when two sheets of paper P enter between the rows 249 and 51, the roller 49 moves the paper P
AT f in the direction of the arrow, while the roller 51 and paper P
is returned in the opposite direction due to T > T and > Tf and is fed one by one. Note that when paper feeding is completed, the lever 43 is lowered as shown in FIG.

Next, the case of double-sided copying of paper P will be explained. At this time, as shown in FIG. 2, the f-toe 25 in the conveyance unit 24 is rotated as shown by the broken line, and the paper P with an image formed on the - side is ejected into the trap in the direction of the broken line arrow by the gate 25. The cassette 32 is guided through the transport path 27.
stored inside. Thereafter, the row 249.degree. 56 is lowered, the roller 49 rolls into contact with the roller 5, and the roller 56 rolls into contact with the paper P in the cassette 41 and rotates once, thereby sending out the paper P. This paper P is guided by a guide plate 39 and is sent to the reno roller 36 in the main body 1 with the other side facing upward. After the sheet P is aligned by the roller 36, it is again sent between the photosensitive drum 2 and the transfer charter 5a, and an image is copied on the other side in the same manner as described above. The paper is ejected from the At this time, is f-25 rotated as shown on the actual ship? +
4re.

The paper P discharged from the paper ejection section is guided by 'y'-12s and is ejected to the paper ejection tray 6 via the ejection row 226.

Finally, let's explain the case of multiple copies.

At this time, the paper P that has been copied on the negative side and is ejected from the paper ejection roller 15 is sent to the transport path 27 through the gate 25 and transported in the same way as in the case of double-sided copying.
At the end of the conveyance path 27, the dart 38 rotates as shown by the broken line.

The paper P is sent to the reno roller 36 in the main body 1 with the paper P reversed by the ID 39, that is, with the copied side facing upward. and.

Aligned by this roller 36, another original image is sent again between the photosensitive drum 2 and the transfer charter 5a, and another original image is copied onto the same surface. Paper output tray 6
1 VC is discharged.

According to this embodiment, the mechanism for double-sided copying is provided in the main body 1.
Since it is provided outside the device, the device can be made more compact.

Further, since the transport unit 24 is detachably provided in one main body 1, the transport unit 24 can be separated when not in use.

Further, since the cassette 41 of the temporary accumulation section 32 is provided in a detachable manner, it can be used as a normal cassette like the cassette 7.8 on the main body side.

In addition, since the cassette 41 of the temporary stacking section 32 is arranged on the same surface as the cassette 7.8 on the main body side, if the paper P is no longer stale, the paper P can be removed from the same direction and is easy to operate. is excellent.

Further, since the apparatus is provided with f-) J8 for re-inverting the sheet P that has been completely conveyed by the conveyance path 27Vc, multiple copies can be made with a simple configuration.

Note that the present invention is not limited to the above embodiment,
Of course, it is possible to modify the actual gun within the scope of its purpose.

〔Effect of the invention〕

As described above, the present invention provides a reversing conveyance means outside the main body of the apparatus which has a paper feeding section on one end side and a paper discharging section on the other end side, and an image is formed on one side of the paper discharging section. The sheets ejected from the reversing conveyor are reversely conveyed to the paper feed section side, and the sheets are temporarily accumulated in the stacking section, and the stacked sheets are transferred to one page in the main body of the apparatus by the feeding means. Since the image is sent to the I-image wide section and images are formed on both sides, the entire apparatus can be made smaller and cheaper than a conventional case in which a double-sided image forming mechanism is built into the main body of the apparatus.

Furthermore, since the temporary stacking section is moved toward the paper feeding section of the main body of the apparatus, if a paper jam occurs during paper feeding, the work of removing the jammed paper can be carried out in the same direction, which impairs work efficiency.

In addition, the temporary stack B can be used for normal paper feeding as well as the paper feeding section of the main body of the apparatus, thereby improving space efficiency.

In addition, since the Ifli 11 image forming section is equipped with a beam forming section guide means for selectively reversing all the sheets fed simultaneously by the single reversing conveying means, it is possible to form all the strokes multiple times on one side of the sheet. It is something to play.

[Brief explanation of drawings]

The first page shows an embodiment of the present invention; FIG. 1 is a schematic configuration diagram showing an electronic copying machine and a transport unit; FIG. 2 is an explanatory diagram showing the flow of paper during double-sided copying; and FIG. and FIG. 4 is an explanatory diagram showing the flow of paper during multiple copying. The fifth factor is the perspective view 1 showing the temporary accumulation section and the feeding means 1...
Device main body, 1.8...Paper feed section, 2...Photosensitive drum (
image forming section), 6... Paper ejection tray (paper ejection section), 24
. . . Conveyance unit (w5 is the feeding means), 32 . . . Temporary accumulation section, 33 . Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) In an apparatus in which an image is formed on one side of a sheet fed from a paper feed section at one end of the device main body in an image forming section and then the image is ejected to a paper discharge section at the other end, the device main body a conveying means provided externally for reversing and conveying the paper with an image formed on one side discharged from the paper discharge section toward the paper feed section; and a conveyance means for temporarily accumulating the sheets discharged from the conveyance means. a temporary stacking section provided near the paper feed section and partially protruding outside the main body of the apparatus; and a feeding means for sending the sheets stacked in the temporary stacking section to the image forming section and forming an image on the other side. and a guide means for selectively reversing and guiding the paper conveyed by the conveyance means to the image forming section and forming multiple images on one side thereof. (2) The image forming apparatus according to claim 1, wherein the temporary accumulation section is provided in a detachable manner.