JPS6034107B2 - image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feed bag layer in a double-sided copying machine.

In conventional copying, it was common to copy onto one side of a single sheet of copy paper.

However, when storing a large number of copies, the volume is twice as large as that of books printed on both sides of a single sheet, which poses problems in terms of storage space and weight. Furthermore, there is a need for a double-sided copying machine that copies on both sides of a single sheet of copying paper due to drawbacks such as resource saving and labor saving copying costs. Several types of copying devices have been considered that are capable of double-sided copying using the transfer method. In this method, the paper is guided again to the original or second paper feeding device, and this time it is turned over and fed into the copying machine again, so that the back side is copied in the same way as the front side.

This method can be said to be the most practical method because the copying process requires only one set of copies, which is the same as for single-sided copying, and the copying machine can be made inexpensive and compact. Now, when making double-sided copies on a single sheet of copy paper, the originals corresponding to the front and back sides of the copy paper are copied, so if you use a manuscript table with a manuscript surface for two sheets of copy size, you can make two copies. It is possible to place two originals on the original table at the same time and copy them alternately.

In other words, the effort required to place the original on the original table can be reduced accordingly. (Refer to Figure 1) In this case, either [1] the two sides of the original to be double-sided copied can be separated from each other and placed separately on the manuscript table, or '2) the original, like the pages of a general book, If you want to make a double-sided copy of the front and back sides of
In other words, there are cases in which the front and back sides (because they cannot be separated) cannot be placed on the respective manuscript calendar sides at the same time.

Even in the case of ■, when copying several consecutive pages of a book (I think this is the most common case), the book is opened, placed on the manuscript table, and each opened page is If the original is placed on the calendar side, for example, in the first copying cycle, the back side of the first sheet of copy paper will be
Copy the front side of the sheet of paper, turn over one sheet of the book, and in the third copying cycle copy the back side of the second sheet of paper.
It is possible to copy the front side of the three sheets of paper, turn over one sheet of the book, and copy the back side of the three sheets in the fifth copying cycle.

(Refer to Figure 2) In other words, in this case, the two-sided original placed on the original placing surface is not copied onto both sides of the same copy paper, but on one side and the second side of the single-sided copy paper. will be copied on the other side of the copy paper.

However, even at this time, the two sides to be copied are placed on the document table at the same time. SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus that can automatically perform double-sided copying, is extremely effective, and has high operability.

Examples will be described to clearly explain the present invention.

This embodiment is a transfer-type electronic copying machine that employs an original platen movement system and is capable of easily copying even thick three-dimensional originals. Referring to FIG. 3, the operation of the copying machine will be explained.

When the rotary photosensitive drum 1 rotates to a predetermined position, the document table 4 on which the document 3 is placed on the document table glass 2, which is the document surface, starts to move and is illuminated from below by the illumination lamp 5. The image is formed on the photosensitive drum 1 at an exposure section 8 by a reflecting mirror 6 and a mirror lens 7 . The photosensitive drum consists of a photosensitive member with a photosensitive layer covered with a transparent insulating layer, and the photosensitive member is first positively charged by a corona discharger 1 to which a high positive voltage is applied from a high voltage power source 9.

Subsequently, when the light image reaches the exposure path 8, the light image from the illumination section 5 is slit-exposed and, at the same time, static electricity is removed by the corona discharger 11 to which an AC high voltage from the high-voltage power source 9 is applied.
Next, the entire surface is exposed by the entire surface exposure lamp 12 to form a static exposure latent image on the drum surface, and the drum is moved to the developing device 13. In the development, the static latent image formed on the drum 1 is visualized by pre-powder development using an IJ tube method. Next, the transfer paper sent from the paper feed section is brought into close contact with the drum 1 and transferred to the transfer means 14.
The image on the drum 1 is transferred onto the transfer paper.

After the transfer, the transfer paper is separated from the drum 1 by a separation belt 15 and guided to a fixing section 16. The remaining developer on the drum 1 is cleaned by the blade 17 pressed against it, and the next copying cycle is repeated. On the other hand, the transfer paper is housed in cassettes 18 and 19, and is removably attached to the paper feed section at the lower left of the machine. Based on the copying machine configuration as described above, one of the features of this embodiment will be described.

In FIG. 4, the stack stand has a cassette 19 for storing transfer paper and a cassette storage stand 20, and the cassette 19 can be set on the cassette storage stand 20.
The swinging arm 22 is made rotatable by the support rod 21.

This swinging arm 22 is also rotatably attached to a rotation support shaft 23 on the main body side.
3, and can be easily moved to both the normal position of the cassette storage table for actual copying and the position of the cassette storage table 20 shown in FIG. 5, which is deviated from the normal position. ing. On the other hand, in FIG. 5, the cassette 18 is set on a cassette storage stand 24, and the swing arm 26 is rotatable by a support shaft 25 on the cassette storage stand 24. This swing arm 26 is connected to a rotation support shaft 27 on the main body side.
The cassette storage table 24 is also rotatably mounted, and the cassette storage table 24 swings around a rotating support shaft 27, and the position of the cassette storage table 24 is adjusted between the normal position of the cassette storage table when actually copying, and the position directly below the ejection tray 28. The cassette storage table 24 can be easily moved to both positions shown in FIG. Next, cassette 18
I will add an explanation to the movement related to and 19. first,
In FIG. 4, the cassette 19 is placed on the cassette storage stand 20.
The cassette is set in the correct cassette storage position when actually making copies. When double-sided copying is to be performed in this state, the cassette 18 is placed on the ejection tray 28 in order to serve as a tray to receive the transfer paper sent out from the cassette 19, when the transfer paper is transferred and ejected by the ejection roller 29. A cassette storage stand 24 is set so as to be in a close position. At this time, the tray that originally receives the imitation paper is as shown in FIG. 4, the plate 31 rotates around the fulcrum 30, the cassette 18 with a part of the tray released serves as the tray, and the discharge roller 2
The copying paper discharged from 9 is stored. Next, as shown in FIG.
Rock 4.

At this time, the cassette 19 is swung about the rotary shaft 23 from the original paper feeding position shown in FIG. 4 to a position deviated from the paper feeding position as shown in FIG. At this point, the plate 31 constituting the tray 28 is returned to its original position (the fifth
(Fig.) and starts copying again, a transfer image is created on the opposite side (back side) of the transfer paper from the previous transfer image, and the transfer paper is ejected from the ejection roller 29 and stacked on the tray 28, completing a double-sided copy. . Also, if you want to use the cassette 19, use the cassette storage stand 24 that stores the cassette 18.
When the paper cassette 19 is brought to the position shown in FIG. 4, the cassette storage stand storing the cassette 19 automatically returns to the original paper feeding position shown in FIG.

Moreover, the tray 28 is connected to the plate 18 as shown in FIG.
If you set it back, normal one-sided copying can be done quite naturally. Next, a modified example shown in FIG. 6 will be described.

This is a modification of the pseudo-paper portion of the above-mentioned embodiment, so that the copy paper on which both sides have been copied is guided back into the copying machine for back-side transfer without being ejected from the machine. That is, when copying both front and back sides, the copy paper passes through the fixing device 47 and is conveyed by the pseudo paper rollers 48 and 49, and the copy paper advances while having excess charge removed by the static eliminator 5.
1, and is guided to a path 52 for back side copying by reversing the paper ejection rollers 48, 49.

The guide plate 53 is moved to a position where it guides the copy paper into the path 52 simultaneously with the reversal of the paper discharge rollers 48 and 49, and the copy paper stops near the registration roller 54. Subsequently, the process moves to reverse side copying, and the copy paper is fed into the copying apparatus by a paper feed signal while being controlled by the register roller 54 again.

After the transfer is completed, the image passes through a fixing device 47 and a static eliminator 50 and is discharged onto a tray 55 by drum rollers 48 and 49.

The feature of this embodiment, unlike the previous embodiments, is that it is easy to copy the front and back sides of each copy sheet, and it is easy to realize an apparatus that automatically copies the front side and then the back side.

Furthermore, the features of the device of this embodiment will be explained in detail.

As shown in FIG. 7, the document table of this copying machine has a size that covers B4 size, and a case where a double-sided copy of a B5 size book is to be made on B5 size copy paper is taken as an example. The manuscript calendar side is divided in the center into side A and side B (each B5 size), and the two B5 size sides can be placed on the document table at the same time. First, the case of A-side copying will be explained with reference to FIGS. 8 and 9.

Side A of the document table is located just in front of the slit in the illumination section, like in a normal copying machine, and the document table is started by a start signal controlled by the rotation of the photosensitive drum and begins the exposure process for side A, completing the exposure. The document table then stops. Next, the case of B-side copying will be explained with reference to FIGS. 10 and 11.

The B side of the document table is located immediately in front of the illumination unit slit, and the document table stops when the exposure process for the B side is completed, similar to the case of A side copying. The length of the exposure process for side A is (although it is the same for side B)
Since the length is the length 1 of the A side plus the margin for starting and stopping the movement during the slit, the stop position is as shown in FIG. 9.

Therefore, when copying of side A is completed and you want to move on to copying of side B, move the document table back and move to the document table start position for side B copy.
(shown in Figure 10). Similarly, when moving to A-side copying after completion of B-side copying (Experiment 11), the original table needs to be moved back to the original stand start position for A-side copying. Next, by determining these sides A and B that side A is the front side for copying the manuscript layer and side B is the back side, the following convenient features can be added.

Utilizing the fact that the original platen start positions for A-side copying and B-side copying are different, it is possible to issue a signal and carry out the following operations. When copying the A side, first, it is displayed that it is a front copy.

Further, an instruction or warning means is provided so that the copy paper is set in the paper feeding state for back side copying after copying is completed.

Alternatively, it can be automated and the back side copy paper feeding state can be established after copying is completed. To explain with an example, in this case,
A microswitch or the like is used to detect that the cassette 18 is in a position to receive the copy paper on which side A has been copied, and that the plate 31 on the tray 28 is in an open state. In this state, the association is made so that the A-side copy start signal is not output. Further, in the modification shown in FIG. 6, the copy paper after copying is not discharged from the discharge roller, but is reversed, so that the back side copy paper is fed.

Further, when copying the B side, first, it is displayed that it is a back side copy.

Furthermore, after copying is completed, an instruction or warning is issued to discharge the copy paper onto the tray, or the copy paper is actively automated and discharged onto the tray. In this way, by changing the display and operation of the copying machine for A-side copying and B-side copying, it is possible to improve operability. In addition, as shown in Figure 12, there are generally two types of books: right-bound and left-bound, but in both cases, the front side of each sheet of paper is an odd-numbered page, and the back side is an even-numbered page. It is customary.

Therefore, by placing an odd number of pages on side A and a number of corner pages on side B, there is no distinction between right binding and left binding, and error-free double-sided copying is possible in either case. In this case, the book is the first
As shown in Figure 2, the pages are placed upside down when binding to the right or binding to the left. This is also one of the advantages that by setting sides A and B to be front copy paper and back copy paper, respectively, convenient instructions can be given for operation. In addition, if copies are made in the order of A-side copying, then B-side copying, that is, front-side copying, then back-side copying, in this embodiment, the copied paper is stacked on the tray with the back side facing up. It is extremely convenient as they are arranged in a uniform manner.

As mentioned above, each of the above-mentioned embodiments has been described using a copying machine with a reciprocating document table as an embodiment. However, the present invention is not limited to this, and if the copying machine uses a stationary document type, the optical system (illumination section) is relatively
, B, and can be moved not only to copying machines but also to all other copying machines having an original table. As described above, the present invention allows the copy material to be conveyed by reversing the conveying direction while gripping the copy material. It is possible to reliably perform double-sided copying even on copying materials with weak susceptibility.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the manuscript copying machine, FIG. 3 is a longitudinal sectional view of a copying machine to which the present invention can be applied, and FIGS. 4 and 5 are enlarged operation explanatory diagrams of the tray cassette portion. FIG. 6 is a vertical cross-sectional view of a copying machine to which an embodiment of the present invention is applied, FIG. 7 is an explanatory diagram of the document table table, FIGS.
FIG. 2 is an explanatory diagram of a state in which a book is set on a document drum stand. 18, 19 are transfer paper cassettes, 20, 24 are cassette storage stands, 21, 25 are spindles, 22, 26 are swing arms, 23,
27 is a rotating shaft, 28 is a discharge tray, 29 is a discharge roller, 33 is a lock lever, 35 is a lock release koji, and 38 is a roller catcher. Fig. 2 Fig. 11 Fig. 1 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Figure ball diagram Dimensions of the ship Fig. 5 Fig. 12

Claims (1)

[Claims] 1. In an image forming apparatus that forms images on both the front and back sides of a copy material, a first conveyance path for conveying the copy material sent out by a register means through a transfer position and a fixing position by moving in one direction; and a first conveyance path. In order to convey the copy material sent out from the first conveyance path to the register means again, the conveyance direction of the copy material is reversed while the copy material is being gripped, and the copy material sent out from the first conveyance path is transported outside the main body of the apparatus. Copy material conveyance direction changing means having a shared roller for ejection; Copy material conveyed by the copy material conveyance direction changing means to eject the copy material sent out from the first conveyance path out of the main body of the apparatus. a discharge path for discharging the copy material, and a copy material conveyance direction changing means to reverse the conveyance direction of the copy material sent out from the first conveyance path to convey the copy material sent out from the first conveyance path to the register means again. An image forming apparatus characterized by having a conveyance path for double-sided transfer.