JPS59211067A - Recording paper feeding mechanism - Google Patents

Abstract

PURPOSE:To secure a space between an intermediate tray and a recording part, and to execute easily a processing at the time of a jam, etc. by making the intermediate tray for double-face recording rotatable so that this side of a recording device is opened. CONSTITUTION:As for an intermediate tray 20 for double-face copying, this side can descend and rotate centering around a supporting point Q of the inner part of a load base 21. Usually, it is held in a horizontal state by a chip. When a jam occurs in the vicinity of the tray 20, a coupled state to a body 1 by a clip means is released by operating a lever which is not shown in the figure, and the tray 20 is rotated to a position of a chain line in the direction as indicated with an arrow B against a spring force of a torsion bar, in this side A, by which a sufficient space can be secured between the tray 20 and the body 1, and also the vicinity of the tray 20 becomes easily visible, therefore, the jam is processed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a recording paper feeding mechanism of an automatic double-sided recording device that facilitates jam removal in a narrow space.

(B) Prior Art Recently, automatic duplex copying machines that are capable of copying on both sides of recording paper have been proposed. In this type of copying machine, after copying one side of the recording paper, in order to copy the other side, it must be fed to the paper feed side again and sent to the recording section (transfer process, etc.), and an automatic duplex feeding mechanism is used for this purpose. is provided. It is conceivable that the recording paper that has been copied on one side by this feeding mechanism is temporarily stored in, for example, a duplex tray (also referred to as an intermediate tray), and then sent out again from the duplex tray and copied on the other side. By the way, in a conventional duplex copying machine, if a paper jam (so-called jam) occurs near the duplex tray after the recording paper has been recorded on one side through a series of copying processes, the side cover of the copying machine body should be pulled forward and the duplex The tray is pulled out to the front to remove the jammed paper (Japanese Patent Laid-Open No. 57-62145).

In this case, since a space is required in front of the copying machine for clearing the jam, there is a problem in that the clearing of the jam cannot be done smoothly if the copying machine is installed in a relatively narrow space. Also, for the transport surface of the recording paper,
Since the double-sided tray is pulled out in parallel, there is a risk that the jammed paper may become wrinkled or torn, and may also cause trouble to the conveyance rollers and other members.

(C) Object and Structure of the Invention The present invention provides a recording paper that is discharged from a recording unit and that has been recorded on one side, is held in a -H intermediate tray, and then fed to the recording unit again to record the opposite side. In a self-weight double-sided recording device that has a feeding mechanism, in order to facilitate jam clearance when the space on the front side of the device is narrow, the intermediate tray is installed at a part of the rear side of the device so that the front side of the device is open. It is rotatable around a shaft.

) Example The present invention will be explained below based on the drawings.

FIG. 1 shows a schematic configuration of an embodiment of an automatic double-sided copying machine according to the present invention, in which a platen glass P on which a document M is placed is provided on the upper surface of a main body 1, and this platen glass P in the main body L is provided. A scanning optical system 2 is provided below the glass P. The scanning optical system 2 includes an original irradiation lamp 2a and a mirror 2b that move back and forth.

2e, and around the fixed lens 2d and mirror 2e, there are a charging electrode 4 for uniformly charging the photoreceptor 3a along the rotational direction, a developing device 5 having a built-in developing sleeve 5a'Q, and a transfer electrode 6. , a separation electrode 7, a static elimination electrode 8, and a cleaning device 9 are arranged in this order. paper feed force cera) 1
0.10' contains two types of recording paper of different sizes and is set in the main body 1. paper feed force cera)
A bottom plate 12 for lifting the recording paper upward by a pressure roller 11 is provided inside each of the bottom plates 10 and 10'. 13
is a feeding roller that feeds the recording paper stored in the paper feeding force cera) 10 to the position of a registration roller 14, which will be described later;
It is composed of rollers 13a, 13a rotated via a belt and a stop roller 13b to prevent recording sheets from being fed in an overlapping manner.

This is a conveyance device that temporarily stops the recording paper fed by the 14Vi paper feed roller 13, and then conveys the paper again to the fixing position in synchronization with the leading edge of the image on the photoreceptor 3a toward the transfer position. , fixing device]
6 is replaced by a heating roller 16a and a pressure roller 16b.

This is a paper ejecting roller that ejects the recording paper after fixing 17 to the recording paper reverse feeding device 18, and this recording paper reverse feeding device 18t'j is a separate body from the main body 1 and is located on the paper ejecting side of the paper ejecting roller 17. The roller 18 is provided with a forward rotation roller 18a and a forward rotation roller 18b. 19 A ninth sorter provided on the paper discharge side of the Tri recording paper reverse feeding device 18 and arranging the pages of the recorded material; 20 a ninth sorter provided in the pedestal 21 and fed from the recording paper reverse feeding device 18 with single-sided recording paper; This double-sided tray 2'0 is a double-sided tray that temporarily stores the recording paper.The front of the feeding direction (right side in the figure) of this double-sided tray 2'0 faces slightly downward in order to make it easier to store the recording paper. The device is tilted so that the front side of the device is lowered so that it can be aligned. The double-sided tray 20 is provided with a size regulating plate (not shown) that is movable according to the width of the recording paper and a double-layer tray auxiliary guide plate 231, which will be described later. Auxiliary conveyor belts 23, 23', 23' for guiding the recording paper from the recording paper reverse feeding device 18 to the duplex tray 20 during double-sided copying.
is a pressure contact roller that can swing freely in the direction of the arrow by a parallel four-bar link 24, and these pressure contact rollers 23, 23'
.

In each of the two sheets, a double-sided tray auxiliary guide plate 231 that holds the recording paper on the side of the auxiliary conveyance belt 22 is loosely arranged so as to form a parallel four-bar link structure. Also, these pressure rollers 23, 23'.

23' moves integrally with the double-sided tray auxiliary guide plate 231, and is pressed against the auxiliary conveyance belt 22 according to the size of the recording paper during double-sided copying. The pressure roller 23, the double-sided tray auxiliary guide plate 231, and the parallel four-bar link 24 are shown enlarged in FIG. However, when the size of the recording paper is large (for example, A3 size), only the left roller 23 moves to the position shown by the chain line, and when the size of the recording paper is medium (for example, B4 size), the left and center rollers 23 move to the position indicated by the chain line. , 23' move to the position shown by the chain line, and when the recording paper size is small (for example, A4 or B5 size), the three rollers 23,
23' and 23'' are all moved to the position indicated by the chain line. 25 is a paper refeed roller for feeding again the recording paper on which one-sided copying has been completed in the duplex tray 20, and this paper refeeding roller The roller 25 is also designed to prevent double feeding in the same way as the paper feed roller 13.As can be seen from the figure, the double-sided tray 20, the auxiliary conveyance belt 22, and the pressure roller 2
3 , 23 ′, 23 ′, the link 24 , and the paper refeed roller 25 form a recording paper holding section 26 that can be raised and lowered within the pedestal 21 .
It is located inside. 271' is an intermediate roller provided between the rollers 14 and 25 for conveying the recording paper fed by the paper refeed roller 25 to the position of the registration roller 14. On the pedestal 21, there is a paper feed force sensor for the main body 1.
10 and 10' are stored in a paper feed cellar) 28 in which recording papers of different sizes are stored.
, 28' are set. These paper cassettes 2
Similarly to 10 and 10', a pressure roller 11 and a bottom plate 12 are provided in the cassette, and the recording paper is fed by a paper feed roller 13. .

Next, the operation of the automatic double-sided copying machine will be explained.

First, when copying is to be performed on only one side of the recording paper, when the normal copy button is operated, the original M on the platen glass P is exposed and scanned by the scanning optical system 2, and the original M is placed on the photoreceptor 3a of the photoreceptor drum 3. An electrostatic latent image is formed. The electrostatic latent image is made into a visible image by the developing device 5, and the visible image is produced by either the paper feed cassette 10. The image is transferred onto recording paper by fffi8ii6. After the transfer, the recording paper is separated from the photoreceptor 3a by the separation electrode 7, conveyed to a so-called fixing device 16 by the feeding device 15, fixed there, and sent to the recording paper size w18 by the paper discharge roller 17. At this time, each of the rollers 18a and ]8b of the recording paper reverse feed device 18 is rotating forward (rotation direction that guides the recording paper toward the sorter 19 side), so the recording paper is sorted into the sorter 19 with its copy side facing upward. be done.

On the other hand, if you want to copy on both sides of the recording paper, turn on the duplex copy selection button on the operation panel and the recording paper 1 reverse feed device 18 will be activated.
The roller ll'lb is reversed (rotation in the opposite direction to normal rotation)
At the same time, the auxiliary conveyance belt 22 starts driving and presses rollers 23, 23', 23'' according to the recording paper size.
The side regulating plate moves when it moves through the position tube indicated by the chain line, and the recording paper, on which one side has been copied through the series of copying processes described above, is transported toward the roller 18b by the roller IF1a of the recording paper reverse feed device 18. be done. Since the conveyance force of the roller 18a is greater than that of the roller 18b, the recording paper is conveyed with its leading edge sliding on the roller 18b.

The roller 18b is not in strong pressure contact with the recording paper, the conveying force is weak, and no jam occurs due to the conveying force of the roller lea. After that, when the trailing edge of the recording paper leaves the roller 18a, the conveyance force towards the roller 18b side (paper ejection direction) is lost, and conversely, the conveyance force in the opposite direction by the roller 18b works, albeit weakly, and the recording paper continues until that point. A pressure contact solar 23 that is reversely fed with its rear end as the leading edge and can be moved up and down according to the auxiliary conveyance belt 22 and the recording paper size and can be driven by the auxiliary conveyance belt 22.
, 23', 23' and guided to the double-sided tray 20 with the copy side facing upward.

A set number of recording sheets are sequentially stacked in the double-sided tray 20 through a similar process. Recording paper is in double-sided tray 2
When a predetermined number of sheets are stacked within 0 (the number of sheets stacked is based on the set number), the driving of the auxiliary conveyance belt 22 is stopped, and the frontward slope 8 (not shown) of the double-sided tray 20 is released and becomes parallel. . At the same time, a double-sided copy signal is output and a copying operation for the back side is started.

That is, the uppermost recording paper in the double-sided tray 20 is lifted upward via the middle plate 102 by the rotation of the seat plate 101 and is brought into pressure contact with the paper refeed roller 25 . Thereafter, the paper refeed roller 25 starts rotating, and the uppermost recording paper in the double-sided tray 20 is fed by the paper refeed roller 25 toward the main body 1 side. At this time, 1 to the front of the double-sided tray 20
Since the rollers 114 are already kept parallel, the paper can be easily fed by the rollers 25. The recording paper fed by the paper refeed roller 25 passes through the intermediate roller 27 and reaches the registration roller 14.
After that, it undergoes a series of copying processes following the same route as when one side was copied before record #, I/'i.

The recording paper on which double-sided copying has been completed is carried out by a paper ejection roller 17,
The recording paper is discharged with the later copied side facing upward by the rollers of the recording paper reverse feeding device 18] 8a and the roller 18b which is already rotating normally, and is sorted into a sorter 19 if there is a sorter.

Now, in the automatic double-sided copying machine, the double-sided tray 20 is located at a position Q on the back side of the pedestal 21, as shown in FIG.
It is supported by a torsion bar and can rotate around this position Q to the position shown by the chain line. However, the double-sided tray 20 is normally biased toward the bottom surface of the main body 1 by the spring action of a torsion bar, and is provided with a crevice (not shown) for reliability. Now, if a jam occurs near the double-sided tray 20, f″ii
Operate the lever shown to release the coupling state to the main body 1 by the click means, and move the double-sided tray 20 in the direction indicated by the arrow B on the front side A.
By rotating the torsion bar in the direction indicated by the chain line against the spring force of the torsion bar, a sufficient length can be secured between the double-sided tray 20 and the main body 1, and the vicinity of the double-sided tray 20 can be easily seen. This makes jam handling easier.

In this embodiment, the double-sided tray can be rotated by supporting the center of rotation with a torsion bar, but in the present invention, the double-sided tray may be rotated using an air cylinder. Furthermore, the configuration of the recording paper holding section is not limited to the configuration shown in this embodiment.

(E) Effects of the Invention The present invention provides a recording paper feeding system in which a recording paper with one side recorded on it discharged from a recording section is held in a -H intermediate tray and then fed again to the recording section in order to record the opposite side. In an automatic double-sided recording device having a mechanism, the intermediate tray is provided so as to be rotatable around a part of the rear side of the device so that the front side of the recording device is opened, so that the intermediate tray and Sufficient space can be secured between the recording section and the recording section. Therefore, it becomes easy to clear the jam when the space on the front side of the device is narrow.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of an automatic double-sided copying machine according to the present invention, and FIG. 2 is an enlarged view of the pressure roller 23, double-sided tray auxiliary guide plate 231, and parallel four-bar link 24 shown in FIG. 3 is a schematic left side view of the copying machine shown in FIG. 1. DESCRIPTION OF SYMBOLS 1... Main body, 2... Scanning optical system, 3... Photosensitive drum, 4... Charging electrode, 5... Developing device, 6... Transfer electrode, 7... Separation electrode, 8... Static elimination electrode, 9...
・Cleaning device, 1.0, 10', 28,
28'...Paper feed cassette, 13-...Paper feed roller, 1
4... Registration roller, 15... Conveyance device, 16.
. . . Fixing device, 17 .
, 23', 2zu-pressing roller, 231... Double-sided tray auxiliary guide plate, 24... Parallel four-bar link, 2
5... Paper refeed roller, 26... Recording paper holding section, 27
...Intermediate roller patent applicant Konishiroku Photo Industry Co., Ltd. Agent Patent attorney Hiroshi Suzuki

Claims (1)

[Claims] In the recording paper feeding mechanism for an automatic double-sided recording apparatus, the recording paper feeding mechanism for an automatic double-sided recording apparatus holds the recording paper with one side recorded on it discharged from the recording unit in the -H intermediate tray, and then feeds the recording paper to the recording unit again to record the opposite side. A recording paper feeding mechanism characterized in that an intermediate tray is rotatably provided around a part of the rear side of the recording apparatus so that the front side of the recording apparatus is opened.