JPH0619608B2 - Copy paper conveyor for copier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copy sheet conveying device in a copy machine, and more particularly, to a copy sheet for a copy machine configured to copy both sides of the copy sheet or to reverse the copy sheet. The present invention relates to a carrier device.

Conventionally, the copy paper used for copying a copy such as a manuscript is copied on only one side during copying,
The need for double-sided copying has arisen for the purpose of saving copy paper and for the reason that the amount of paper used is halved when a large amount of copy paper is consumed, and the storage of copy paper becomes efficient.

In order to make this double-sided copy, one side of the copy paper is copied and the copy paper discharged from the discharge port is artificially turned upside down,
Since it is carried out by a complicated method of setting it at the entrance and copying it again, there is a drawback that it is inefficient.

In order to eliminate such a defect, for example, JP-A-58-58
54352, JP-A-58-21267, JP-A-58-60763, and JP-A-58-21268.
A copying machine capable of double-sided copying as described in Japanese Patent Laid-Open No. 56-125761 and Japanese Patent Laid-Open No. 56-125761 has been developed.
An intermediate tray is required to perform double-sided copying, and as a result, the copying machine becomes large and page alignment is difficult.

Further, in order to eliminate this intermediate tray, JP-A-53-12
A double-sided copying machine described in Japanese Patent No. 3141 has also been developed.

In the present invention, for example, the paper feed roller 3 operates and copy paper is fed from the paper feed cassette 1. The fed copy paper reaches the peripheral surface of the copy drum, where it is copied on one side and then discharged through the separating device 12 and the fixing device 13 to the first guide 18 with the copy surface facing upward. The copy paper on the first guide 18 is further moved to the second guide 19, and the driving roller 15,
15 'is pulled out in the direction of the arrow. When the trailing edge of the copy sheet passes the position of the micro switch 16, the micro switch 16 which has been operated by being pressed by the copy sheet returns to the micro switch 16, and when the trailing edge of the copy sheet is detected to pass, drive is performed. The rollers 15 and 15 'rotate in the opposite direction to the above to transport the copy paper in the direction opposite to the arrow. Then, the copy paper is guided to the transport path 17. Then, the copy paper guided to the conveyance path 17 is transferred to the registration roller 2
By 0, 20 ', the surface which has not been copied is directed to the peripheral surface of the copying drum and is transferred, so that the transfer is performed on the surface. Then, the copying machine whose both sides are copied is discharged onto the discharge tray 14 via the separating device 12 and the fixing device 13.

By the way, according to the invention disclosed in Japanese Patent Laid-Open No. 53-123141, when the first surface is copied and the second surface which has not been copied yet is copied, the drive rollers 15 and 15 'are rotated in reverse. At the same time, it is necessary to turn over the original on the original table for copying.

That is, in order to copy both sides of a document printed on the front and back sides, the document must be turned upside down once. If 10 double-sided copies are required for one original on which both front and back sides are printed, the original must be reversed 10 times.

Also, when making a double-sided copy of ten originals, there is also a method of copying only one side of the original, then reversing the original to make ten copies of the other side that has not yet been copied. You need only flip once.

However, in that case, the drive roller is rotated in the forward direction to copy 10 sheets of one side of the first original document, and store 10 sheets in the discharge tray.
Since it is troublesome that a sheet of copy paper has to be artificially transferred to the paper feed cassette 1 or 2, development of a more efficient double-sided copying machine has been awaited.

Therefore, the present invention provides a first paper feed cassette provided at one end of the main machine frame, and a copy paper after the image is transferred from one of the first paper feed cassettes and fixed on one side. In order to convey in a direction instructed based on a command signal, a conveyance direction control roller provided on an auxiliary machine frame attached to the lower bottom wall of the main machine frame, and one side end of the main machine frame. A second paper feed cassette provided in parallel with the first paper feed cassette; a return belt for returning the copy paper fed by the conveyance direction control roller toward the second paper feed cassette; The copy paper fed through the return belt is provided in the second paper feed cassette for feeding it to the second paper feed cassette in a state of being reversed so that an image is transferred to the other surface side. And a switchback roller that is When the direction control roller rotates normally according to the command signal, the copy paper is fed to the return belt, and when the conveyance direction control roller rotates reversely according to the command signal, the copy paper is transferred to the return belt. Based on the command signal, the copy paper is fed from the copy paper transporting device for the copying machine and the first paper feed cassette, and is transferred to the copy tray without being transferred, and after the image is transferred and fixed on one side A feed direction control roller that feeds the copy paper fed by the feed direction control roller, and a feed belt that feeds the copy paper fed by the feed direction control roller toward the second paper feed cassette; The copy paper is equipped with a switchback roller in a state in which the copy paper is reversed so that an image is transferred to the other side, and the second paper feed cassette is detachable from the main machine frame. , Aims at solving the above drawbacks by providing a copying paper conveying apparatus for a copying machine.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a simplified state of a copy paper showing an inverted state, and FIG. 2 is a cross-sectional view of a copying machine for copying the inverted other side. In the figure, reference numeral 1 is a main machine frame, and a transparent plate 2 on which an original is placed horizontally is provided above the main machine frame. The first paper feed cassette 3 for storing the copy paper A is installed substantially at the center of the right end portion of the main machine frame 1 as shown in FIG. 1, and is the second paper feed cassette for copying the back side of the copy paper. 4 is provided under the first paper feed cassette 3, and the copy paper after the completion of copying is the first copy paper.
It is discharged onto the copy tray 5 provided at the left end in the figure. In this way, the paper feed cassettes mounted on the main machine frame 1 are the first paper feed cassette 3 and the second paper feed cassette 3 which are arranged side by side in the vertical direction.
The number of the paper feed cassettes 4 is not limited to two and two, but a plurality of paper feed cassettes 4 may be arranged in multiple stages such as three in the vertical direction to store copy papers of various sizes.

A photosensitive drum 6 whose entire peripheral surface is covered with a photosensitive layer (not shown) is rotatably mounted at a substantially central portion of the main machine frame 1, and is projected onto an original document on the transparent plate 2 and reflected. The generated light is projected on the photosensitive layer through the movable reflecting mirrors 7, 8 in-mirror lens 9 and the reflecting mirror 10 to form an image of the original, and an electrostatic image is formed on the photosensitive layer. Around the photosensitive drum 6, a developing device 12 that visualizes the electrostatic latent image formed on the photosensitive layer to form a toner image and a cleaning device 14 that removes toner remaining on the photosensitive layer after transfer. And are arranged.

18,18 ', 20,20', 22,22 ', 23,2
Reference numeral 3'denotes a pair of conveying rollers for conveying the copy sheet A pushed up by the lever 16 and fed by the sheet feeding roller 15 for single-sided copying.

Further, 17 and 17 'are a paper feed roller 15 and a conveyance roller 18,
A guide plate provided between 18 'and 19'
Reference numerals 9 ', 21, 21', 24, 24 'are a pair of guide plates for guiding the copy paper conveyed between the rollers between the rollers, and 25 is a fixing device for the copy paper after heat fixing. Discharge roller 4 through a pair of transport rollers 26, 26 '
The sheets are discharged to the copy tray 5 by 4, 44 ', but a conveying direction switching plate 27 is provided between the conveying rollers 26, 26' and the discharging rollers 44, 44 '.

The transport direction switching plate 27 has a substantially triangular shape, and the pivot shaft 2
It is rotatable about 7a as shown in FIGS. 1 and 2. A pair of guide plates 28, 28 'are arranged below the transport direction switching plate 27.
Below the 8 ', a pair of conveyance direction control rollers 29, 29' mounted on an auxiliary machine frame 30 attached to the lower bottom wall of the main machine frame 1 are arranged. The conveying direction control rollers 29, 29 'are branched by the conveying direction switching plate 27, and the copy paper guided by the guide plates 28, 28' is moved downward by a command signal.
Rotate to send to 3 (hereinafter referred to as forward rotation),
It can be rotated (hereinafter referred to as reverse rotation) so as to return to the copy tray 5 via the discharge rollers 44 and 44 'located above.

The circulating belt 33 is stretched between the belt roller 31 arranged at the left end of the auxiliary machine frame 30 and the belt roller 32 arranged at the right end of the auxiliary machine frame 30, as shown in FIG. The circulating belt 33 is not limited to the belt, and a roller conveyor may be used as long as the copying paper can be placed and conveyed thereon. A belt roller 34 is disposed on the belt roller 32 so as to sandwich the recirculation belt 33, and a belt roller 35 is provided obliquely above the belt roller 34 so as to project from the main machine frame 1 and below the belt roller 35. A belt roller 37 is provided to sandwich the auxiliary belt 38 between the belt roller 34 and the belt rollers 34 and 3.
5, an auxiliary belt 36 is stretched between the belt roller 32 and the belt roller 37, and a copy sheet conveyed by the loop belt 33 is stretched by the auxiliary belts 36 and 38. Guide plates 39 and 3 that are clamped
Delivered to 9 '. The guide plates 39, 39 'are attached to the paper feed cassette 4, and a pair of switchback rollers 40, 40' are provided at the rear ends thereof. The switchback rollers 40, 40 'rotate so as to send the one-side copied copy paper guided between the switchback rollers 40, 40' to the second paper feed cassette 4 (hereinafter referred to as reverse rotation).
Alternatively, it can be rotated in a direction away from the second paper feed cassette 4 (hereinafter referred to as forward rotation).

A description will be given of a double-sided copy sheet of a copy sheet using the copy sheet conveying device having the above-described structure. First, when one-sided double-sided copy is performed on one sheet of original having both sides printed, FIGS. As shown in the figure, the first paper feed cassette 3 contains copy paper A whose both sides have not been copied yet, and the second paper feed cassette 4 is an empty cassette containing no copy paper. is there. In this state, the copy paper A stored in the first paper feed cassette 3 and pushed up by the lever 16 is fed from the first paper feed cassette 3 by the paper feed roller 15. The fed copy paper is a pair of guide plates 17, 1.
7 ', transport rollers 18, 18', guide plates 19, 19 ',
The transfer roller 20 and 20 'and the guide plates 21 and 21' transfer the transfer roller 22 and 22 'so that the transfer roller 22 and 22' are closely transferred to the photosensitive layer of the photosensitive drum 6 facing the transfer corona discharger 13. To be done. After the transfer is completed, the copy paper is sent to the fixing device 25 by the conveying rollers 23 and 23 'and fixed.

The fixed copy paper contacts the transfer direction switching plate 27 via the transfer rollers 26 and 26 '. In this case, the transport direction switching plate 2
7 is rotated in advance by a command signal around the pivot shaft 27a, that is, in the direction in which the hypotenuse portion faces the conveying rollers 26, 26 ', so that the conveying papers 26, 26' send the copying paper horizontally. 4, as shown in FIG. 4, comes into contact with the conveyance direction switching plate 27 and branches to be guided downward in the vertical direction. As shown in FIG.
8'conveying direction control rollers 29, 29 '
It is placed on the return belt 33 by the normal rotation of. At this stage, the copy paper is turned over. That is, the copied one side is in contact with the return belt 33, and the one side not yet copied is exposed. The copy paper placed on the return belt 33 is
As shown in FIG. 1 and FIG.
Is conveyed to the right by the movement of, and is sandwiched by the auxiliary belts 36 and 38, guided by the guide plates 39 and 39 'attached to the second sheet feeding cassette 4, and is guided to the pair of switchback rollers 40 and 40'. Be guided. By the forward rotation of the pair of switchback rollers 40, 40 ', as shown in FIG. 4, the leading end portion of the copy paper A is projected from the switchback rollers 40, 40' and the rear end portion thereof is still the switchback roller. At the stage of being sandwiched by 40 and 40 ', the switchback rollers 40 and 40' are reversely rotated by a command signal to feed the copy paper A into the second paper feed cassette 4 with one side not yet copied up. . Next, in order to copy this one side which has not been copied yet, the transport direction switching plate 27 is rotated in parallel with the transport direction of the copy paper by a command signal. That is, it is displaced to the position shown in FIGS. Then, the paper feed roller 41 feeds the copy paper pushed upward from the second cassette 4 by the lever 42. The fed copy paper is guided by the guide plates 43, 4
3'is guided to the conveying rollers 20, 20 ', and is transferred and fixed via the above-mentioned system path to the conveying rollers 26, 20'.
26 ', it is sent to the copy tray 5 by the discharge rollers 44, 44' without coming into contact with the conveyance direction switching plate 27 as shown in FIG.

Thus, double-sided copying can be completed.

Further, the second paper feed cassette 4 is not only usable for double-sided copying, but can also be used when it is desired to copy only one side. That is, one cassette can be used for both single-sided and double-sided copying.

Further, when two-sided copying of a plurality of sheets, for example, ten sheets is required for one original having both sides printed, first, the original having both sides printed is placed on the transparent plate 2, and 1
The copy paper A pushed up by the lever 16 housed in the paper feed cassette 3 is fed from the first paper feed cassette 3 by the paper feed roller 15. The fed copy paper A is copied on one side by the above-mentioned method and is sent to the second paper feed cassette 4. In this way, the copy sheets of which one side is copied by 10 sheets are stored in the second sheet feeding cassette 4.

Next, the original on the transparent plate is turned over to copy the other side which has not been copied yet. In this case, the original is reversed and the copy paper is fed from the second paper feed cassette 4. One side of this copy paper, which has not been copied yet, is copied by the above-described method to complete double-sided copy, and is sent to the copy tray 5.

When two-sided copying of a plurality of sheets, for example, ten sheets is required for one original having both sides printed in this way, it is not necessary to invert the original 10 times, and only one inversion needs to be performed. Since double-sided copying is possible, copying work becomes quick and efficient.

FIG. 6 is an explanatory diagram of an embodiment of the first invention. For example, in a manuscript in which pages such as a book are sequentially arranged, copying may end with an odd number of sheets.

In that case, the last copy need only be one side, but the copy tray 5
The need arises to reverse and align the pages.

Then, in order to turn over, the copy paper, which has been copied on one side by the loop belt 33 in the auxiliary machine frame 30, is sent to the second paper feed cassette 4. It is time-consuming and troublesome to make a hidden copy by removing the original from the second paper feed cassette 4. In order to save such troubles, the copy paper fed from the first paper feed cassette 3 and copied on one side is brought into contact with the transport direction switching plate 27 and guided downward, and the transport direction control rollers 29, 29 '. Is sent to the return belt 33 by the transfer direction control rollers 29, 2
Although it is far from 9 ', when the rear end is still nipped by the conveyance direction control rollers 29, 29', by rotating the conveyance direction control rollers 29, 29 'in the reverse direction,
From the conveyance direction control rollers 29, 29 'to the discharge rollers 44,
The copy paper is guided to 44 ', and in the inverted state, the copy tray 5
It can be sent to and page alignment can be done.

FIG. 3 shows an embodiment of the second invention, which is a guide plate 3
The second paper feed cassette 4 to which the switchback rollers 40 and 40 'are attached is removable from the main machine frame 1, and the switchback rollers 40 and 40' and the guide plates 39 and 39 'are The attached second paper feed cassette 4 is removed from the main machine frame 1, and the switchback rollers 40, 4
0'and other cassettes to which guide plates 39 and 39 'are not attached can be attached to only one side which does not require double-sided copying. In addition, the first paper feed cassette 3 and the second paper feed cassette 4
Prepares paper feed cassettes of different sizes, and stores copy paper of different sizes in the paper feed cassettes 3 and 4, respectively, and switches the switch as necessary to enable copying of a desired size. Can be convenient.

As described above, the present invention includes a conveyance direction control roller,
Since a return belt and a switchback roller are provided,
Double-sided copying can be performed cheaply with a simple structure.

Further, since the switchback roller is provided in the second paper feeding cassette, if one side of the original sheet having both sides printed is required to be duplicated on a plurality of sheets, the original sheet can be turned upside down once. Since double-sided copying of multiple sheets is possible, multiple operations can be performed quickly and efficiently.

Furthermore, since the transport direction control roller can be rotated forward and backward,
Pages can be aligned on the existing transport route without requiring a special transport route.

Further, since the second paper feed cassette is detachable, it is convenient to install different size cassettes.

In addition, the second paper feed cassette can be used not only for copying on both sides but also for copying on one side only, that is, one cassette can be used for copying on one side and both sides. effective.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention, in which FIG. 1 is a simplified cross-sectional view of a copy paper showing an inverted state, and FIG. 2 shows a state of being copied on the other side where an image has not been transferred yet after being inverted. FIG. 3 is a simplified cross-sectional view of the copy paper, FIG. 3 is an explanatory view showing the second paper feed cassette removed from the main machine frame, and fourth is the reverse copy paper after the image is transferred to one side. 2 is an explanatory view until it is returned to the paper feed cassette of FIG. 2, FIG. 5 is an explanatory view until the double-sided copying is completed by copying the reversed one side, and FIG. It is explanatory drawing of a place to reverse. 3 ... First paper feed cassette, 4 ... Second paper feed cassette, 29, 29 '... Conveyance direction control roller, 40, 40' ... Switchback roller, A ... Copy paper.

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-58-54352 (JP, A) JP-A-58-21267 (JP, A) JP-A-58-60763 (JP, A) JP-A-58- 21268 (JP, A) JP 56-125761 (JP, A) JP 53-123141 (JP, A)

Claims (2)

[Claims] 1. A first sheet feeding cassette provided at one end of a main machine frame, and a sheet supplied from the first sheet feeding cassette,
It is provided on an auxiliary machine frame attached to the lower bottom wall of the main machine frame in order to convey the copy sheet after the image is transferred and fixed on one side in the direction instructed based on the command signal. A conveyance direction control roller, a second paper feed cassette provided at one end of the main machine frame and provided in parallel with the first paper feed cassette, and the copy paper fed by the conveyance direction control roller to the second paper feed cassette. In the state in which the return belt for returning the sheet to the sheet feeding cassette and the copy sheet sent through the return belt are reversed so that the image is transferred to the other side, A switchback roller provided in the second paper feed cassette for feeding the paper to the paper cassette, and when the transport direction control roller rotates in the forward direction according to the command signal, the copy paper is fed to the return belt. , Said transport When direction control roller is reversely rotated in accordance with the command signal, the copy paper is fed into the copy receiving tray without being sent to the Drying belt, copying paper conveying apparatus for a copying machine. 2. A first paper feed cassette provided at one end of a main machine frame, and a paper feed from the first paper feed cassette,
In order to convey the copy paper after the image is transferred and fixed on one side in the direction instructed based on the command signal, it is provided in the auxiliary machine frame attached to the lower bottom wall of the handwriting frame. A conveyance direction control roller, a second paper feed cassette provided at one end of the main machine frame and provided in parallel with the first paper feed cassette, and the copy paper fed by the conveyance direction control roller to the second paper feed cassette. In the state in which the return belt for returning the sheet to the sheet feeding cassette and the copy sheet sent through the return belt are reversed so that the image is transferred to the other side, And a switchback roller provided in a second paper feed cassette for feeding to the paper cassette, wherein the second paper feed cassette is detachable from the main machine frame.