JPS5843465A - Paper refeeder of image forming apparatus - Google Patents

Abstract

PURPOSE:To dispense with a special reversal device, by drawing out a transfer paper brought in an intermediate tray in the direction same as that in which the paper has been brought in multiple copying, and, in both side copying, drawing out the paper in the direction reverse to said direction. CONSTITUTION:In both side copying, opposite to multiple copying, a both side paper feed roller 14 is set in the lowered position, and a cam 18 for moving a middle plate 16 up or down is raised to push up the end of the plate 16, the other paper feed roller 13 to be used in multiple copying is raised, and the other cam 17 for moving the plate 16 is lowered to lower the end of the plate 16 down to a tray. This state is reverse to that as shown in the figure, the left end of the plate 16 is lowered, and a transfer paper brought onto the plate 16 is in contact with the roller 14, the transfer paper is drawn out with the roller 14 in the direction Z1 through a conveyance route Z.

Description

Detailed Description of the Invention Misfire WIi1 relates to a paper refeeding device for an In image forming apparatus that refeeds transfer paper from an intermediate tray in a reversed state or a non-reversed state. From the viewpoint of increasing the amount of information, saving resources, etc., image forming apparatuses have a function of copying on both sides of transfer paper, and a function of multiple copying that copies and edits multiple originals. Conventionally, for double-sided copying or multiple copying, the 51st original is first copied and fixed on one side, and then, in the case of double-sided copying, a second copy is printed on the opposite side of the transfer paper.
To copy the manuscript, use transfer paper (2) that has been copied on one side.
) Re-feed the paper with the sides reversed, or in the case of multi-electronic copying, re-feed the transfer paper to the non-reverse position 1 in order to copy the second original in the margins on the same side as the copied side. It was feeding paper. When refeeding paper, each of the many sheets of transfer paper should be
In order to eliminate the inconvenience of copying by alternating between the first original and the second original for each sheet, an intermediate tray t is used.
- First, copy only the first original onto one side of a large number of sheets of transfer paper and temporarily store it in the intermediate tray, and then re-feed the paper from the intermediate tray while copying the second original. Ta. This transfer paper must be reversed or non-reversed during double-sided copying or multiple copying, so a reversing device is installed in the path that transports the transfer paper on which the first original has been copied to the intermediate tray, and double-sided copying is required. In this case, a route that passes through a reversing device is selected and conveyed, and in the case of multiple copies, a route that does not go through a reversing device is selected and conveyed and sent to an intermediate tray. However, such a conventional device has the disadvantage that the conveyance path of the transfer paper becomes complicated and there is a high risk of paper knots occurring, and the device also becomes large in size.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a uniformity forming apparatus that does not require a complicated transport path for transfer paper and an increase in the size of the apparatus. The present invention provides transfer paper feeding means for refeeding paper at each end of the intermediate tray at the front end in the feeding direction and at the rear 111111 in the feeding direction when the transfer paper is fed into the intermediate tray. The feeding means installed at the front end in the feeding direction feeds out the transfer paper from above the intermediate tray in the same direction as the feeding direction, and the feeding means installed at the rear end in the feeding direction feeds out the transfer paper from above the intermediate tray. Transfer paper is fed in the direction of travel and t
The transfer sheet is fed inward in the opposite direction, and when refeeding, either one of the two-way feeding means is selected to carry out the operation of feeding the transfer sheet O, and furthermore, The transfer paper feeding means is composed of a device that pushes up the edge of each sheet on the intermediate tray and a drive roller that moves the transfer paper io' upward and into contact with the transfer paper. When the transfer paper is fed into the tray, the butterfly stops the above-mentioned lifting and lowering operations, and when refeeding, one of the two transfer paper feeding means is selected depending on whether multiple copies or double-sided copies are to be made. There are some that have been made to work. As a result, the present invention eliminates the need to specially install a reversing device in the path for conveying the transfer paper to the intermediate tray, making it possible to simplify the conveyance path and downsize the apparatus.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of a paper forming apparatus equipped with the paper refeeding device of the present invention, and FIG. 2 shows the paper refeeding device of the present invention. In FIG. 1, the image of the document on the document table L is guided to the in-mirror lens 4 via the first mirror 2 and the 24th mirror 31, and then to the in-mirror lens 4 via the third mirror 5t.
A latent image is formed by being guided by the P2 unevenness, and the toner image is fed from the paper feed cassette 8 and transferred to the transfer paper. It is incorporated and established. In the case (5) of simple single-sided copying without multiple copying or double-sided copying, the transfer paper after fixing is discharged onto the paper discharge tray 12 by the sorting section 11, and the copying cycle is completed by photons. In addition, in the case of double-sided copying during multiple copying 1, as described above, the first original g11
The transfer paper on which the image has been transferred and fixed is guided to a re-feeding path by the sorting section 11 and temporarily stored on the intermediate tray 15. In addition,
The sorting section 11 is operated by operating a selection button to select whether to make single-sided copies, double-sided copies, or multiple copies. The paper is sorted into intermediate tray III or paper discharge tray.

The intermediate tray 15 is constructed as shown in the second figure. In the same figure, X indicates a feeding path, and the transfer paper, which has been transferred to one side of the first original image, passes through this path when it comes out of the sorting section 11 shown in the first figure. The intermediate tray is fed from the feeding path X to the tray 15, progresses in the direction of arrow X1, and is deposited on the intermediate tray. be accommodated. The leading end of the transfer paper in the feeding direction (arrow x1 direction) is the left end of the illustrated intermediate tray 15, and the rear end of the transfer paper in the feeding direction is the right end of the intermediate tray 15. At one end of the intermediate tray on the leading edge side in the feeding direction, there are provided a transfer paper feeding means (6), that is, a multi-electric copy & f11a drive roller 13, an intermediate plate elevating cam 17, a spring seat 21. Installed spring 191, and
At one end of the intermediate tray on the trailing side in the feeding and selection direction of the transfer paper, a transfer paper feeding means, that is, a double-sided copy paper feed drive roller 14, an intermediate plate elevating cam 18, a spring seat 22, and a guard spring 20 are installed. Then, on both springs 19, 20, each end of the leaf plate 16 is flexed.

The two drive rows 213 and 14 each have a rotating arm 13s.
+14tK, the driving roller is lowered by a rotating arm and descends into contact with the surface of the transfer paper placed on the middle plate 16, and then the middle plate lifting cam 17
, spring seat 21, spring 19, and middle plate lifting cam 1g
, "The storage seat 22 and the spring 20 both push up the edge of the transfer paper placed on the middle plate 16. Because of C, each middle plate lifting cam 17 and 18 respectively Henshin 1゛7゛・”8 * KRI ri (tsu114.艷-
'$j121 and 22 have the lower surfaces of the cams 17 and 18.
The upper surface supports the lower end of the spring seat 21.20, and the upper surface of the spring seat 21. Spring 19 and spring seat 22
, the springs 20 are both installed at the end of the intermediate tray 15, passing through the length 15t*15s'.

The eccentric axes of both intermediate plate elevating cam plates 17 and 18 are equidistant from the intermediate tray 15, and both cams push up the spring seat upward by rotating around the coracoid axis, as shown in the second figure. The cam is in the upper position K1 as shown in 1 of the middle plate elevating cam 17 on the left side.
One rotation pushes up the end of the middle plate 16, and when the cam rotates downward like the right middle plate lifting cam 18, the middle plate 1
Lower the end of 6 near the bottom plate of the intermediate tray. Each drive roller and elevating cam marked with # moves up and down in accordance with the feeding and feeding of the transfer paper, and in order to re-feed the transfer paper from the intermediate tray, it is moved by the multiple copy paper feed drive roller 3. When it is delivered, use the left delivery path YK1 as shown! &C When the double-sided copy paper feed 1 gloss 10-214 is ejected, feed it to the right as shown in the diagram.

The output path zFi is reversed and passes under the intermediate tray in the same direction as the output path Y. Both the output paths Y and z are installed on the left side of the intermediate tray. In the paper refeeding device configured as described above, first, the transfer paper on which the first IIA@W has been transferred has its transfer surface facing the first photosensitive P ram.
As shown in the figure, since the photosensitive drum is sent onto the conveyance section 9 in face-to-face contact with the photosensitive drum surface, the transfer vIJ is located on the upper surface, and when it comes out of the sorting section 11, faces downward, and is sent onto the intermediate tray 15. is fed with the transfer surface facing down. When the transfer paper is fed into the intermediate tray, in FIG. 2, the double-sided copy paper feed drive roller 14 is in the illustrated state, with the 9Vc rotating arm 141 raised upward, and the intermediate plate elevating cam 1
8 is also lowered as shown in the figure, and the end of the intermediate plate 16 is lowered into the intermediate tray to the next position. At this time, the multi-copy paper feed drive roller 13 is also positioned with its rotating arm 131 raised upward, similar to the double-sided copy paper feed drive roller 214, and the middle plate elevating cam 17 is moved downward, similar to the cam 18. The end of the middle plate is then lowered into the middle tray and is in the next position. Therefore, the transfer paper fed into the intermediate tray hits both drive rollers and is prevented from advancing (9).
) Without this, the transfer material advances in the direction of arrow x1 from the feeding path The operation of feeding the paper to the end of the paper feed when transferring the second original image is performed as follows depending on the double-sided copy in the multiple copying machine.

In the case of multiple copying, in response to the instruction signal, the multiple copy paper feed drive roller 13 is placed in a lowered position as shown in the second figure, and the middle plate elevating cam 17 is raised upward as shown in the figure. Place the middle plate 16 in a position where the upper end of the middle plate 16 is pushed up. At this time, the other middle plate lifting cam 18 moves downward and the middle plate end is placed in a lowered position as shown in the figure. The transfer paper is placed on the upper surface of the duplex copy sheet 9, and the double-sided copy paper feed drive roller 14 is placed in an upwardly raised position as shown in the figure. In this state, the upper surface of the left end of the transfer paper placed on the intermediate plate 16 is pushed up and the multiple copy paper feed drive rotor 13 is in contact with it, and the contact pressure is applied by the spring 19). Retained. There (10), the drive row 213 rotates to drive and send out the transfer paper, and the transfer paper moves in the direction of the arrow in the same direction as the feeding progress direction (arrow X1 direction) when it is fed into the intermediate tray. It is sent out in the Y1 direction and sent into the sending path Y. At this time, the first original image transfer surface of the transfer paper is facing downward, so in FIG. The paper surface on the transferred side comes into contact with the photosensitive drum, and the second document image is transferred to the blank portion of the margin where the first document image was transferred, allowing multiple copies to be made on the same surface.

In addition, in the case of double-sided copying, contrary to the case of multiple copying described above, the double-sided copy paper feed drive roller 14 is placed in a downward position, and the intermediate plate elevating cam 18 is raised upward to raise the intermediate plate 160. The other multiple copy paper feed drive roller 13 is raised upwards, and the middle plate elevating cam 17 is lowered and lowered into the middle tray and located at the hole position. Placed. 1jlA
rz This is a situation opposite to that shown in the second diagram, in which the left end of the middle plate 16 is downward and the bottom is 9, and the right end is upward. It is in contact with the paper feed sliding roller 14. Therefore, the drive roller 14
rotates to drive the transfer paper, and the first transfer paper is fed into the intermediate tray in the feed advancing direction (arrow x1).
direction) and is fed into the delivery path 2 in the direction of the arrow z1, which is the opposite direction. At this time, the first document image transfer surface of the transfer paper was on the bottom surface on the intermediate tray, but when it is sent to the delivery path 2 and advances to the bottom of the intermediate tray, it is reversed and the first document image transfer surface is the top surface. It is transported in the direction of arrow z. As shown in FIG. 1, the transfer paper conveyed in this manner is reversed and advances toward the photosensitive drum 6 with the blank side of the bottom fliic 6 in the exit path 2, and the blank side comes into contact with the bottom surface of the photosensitive drum 6, so that the second document is transferred. The image can be transferred onto the blank surface of the paper, and the first and second original images are printed on both sides of the transfer paper, making a double-sided copy possible.

The transfer paper on which the eleventh and second originals II have been subjected to multiple copies or double-open copies as described above is discharged from the sorter 11 to the paper discharge tray 12 in response to a copy cycle end signal, and the copies are photonized.

As explained above and as follows, according to the present invention, in the case of multiple copying in which the transfer paper is not reversed, the transfer sheet fed into the intermediate tray is sent out in the same direction as the feeding and advancing direction, and the transfer + lt1 reversal is performed. In the case of double-sided copying, the paper is fed in the opposite direction to the feeding direction and re-fed to the photosensitive drum, so there is no need to install a reversing device for each side as in the past, and the present invention The paper refeeding device has a reversing function, which simplifies the conveyance path, prevents paper jams from occurring, and makes it possible to downsize the device9.Moreover, when refeeding paper, This is a device that pushes up the feeding end of the transfer paper so that it can be re-feeded reliably from the intermediate tray.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an image forming apparatus equipped with a paper refeeding device of the present invention, and FIG. 2 is a front view of the paper refeeding device of the present invention. . 13.14... Paper feed drive--2 (13) 15... Intermediate tray 17.18... Lifting cam (
14)

Claims (2)

[Claims] (1) The transfer paper on which the first original has been transferred is fed and stored on the intermediate tray, and the transfer paper is re-fed to create the second original.
In an image forming apparatus that performs 1t-transfer, when the transfer paper is fed into the intermediate tray, paper refeeding is performed at each end of the intermediate tray on the rear end side in the feeding direction and on the rear end side in the feeding direction. A transfer paper feeding means is installed for the purpose of feeding, and the feeding means installed on the leading end side in the feeding direction feeds out the transfer paper from above the intermediate tray in the same direction as the feeding direction, and A feeding means installed at the rear end side of the direction feeds the transfer paper from the intermediate tray in a direction opposite to the direction in which the paper is fed, and when refeeding paper, one of the two feeding means is selected. to feed out the transfer paper.
Paper refeeding device of the image forming apparatus as a percentage feature. □ (2) The transfer paper feeding means includes a roller on the intermediate tray (1) a device that performs an operation of pushing up the edge of the copy sheet, and a device that performs an operation of descending and contacting the upper side of the transfer paper; In addition, when the transfer paper is fed into the intermediate tray, the above-mentioned pushing-up operation and lowering operation are stopped, and when the paper is re-transferred, both transfer paper feeding and re-feeding are performed depending on either multiple copying or i1 inner copying. A paper refeeding device for an 0w77A image forming apparatus according to claim 1, wherein either one of the means is selected and operated.