KR930008214B1 - Paper arrangement method of a copier - Google Patents

Abstract

The paper arranging method for efficient copying without break despite the curl on the paper bottom comprise the steps of: feeding sheets by a feed roller; leading sheets by a paper guiding member, top and bottom register rollers of which the circumference is made of steel part and rubber part; the register rollers rotating through contact with the opposite steel and rubber parts of each other; and arranging papers from the feed roller.

Description

How to Align Paper in an Electrophotographic Copier

1 is an opening diagram of a conventional general electrophotographic copying machine.

Fig. 2 is a side view of the main portion showing the feeding and alignment state by the conventional method, and (a) is an abnormal feeding state in which the paper has an upward curl. (b) is a paper feeding condition with a downward curl on the paper. (c) is a normal paper feed state.

Fig. 3 is a side view of the main portion showing the feeding and alignment state in the upper feeding by the method of the present invention, and (a) is a normal feeding state of the container. (b) is a paper feeding condition with up curl on paper. (c) is a paper feeding condition with a downward curl on the paper.

4 is a side view of the main portion showing the feeding and alignment of the lower feeding in the method of the present invention, (a) is a normal feeding state of the container. (b) is a paper feeding condition with up curl on paper. (c) is a paper feeding condition with a downward curl on the paper.

* Explanation of symbols for main parts of the drawings

21: Feed roller 22, 23, 24: Paper guide

25, 26: Register roller 27, 29: Steel part

28, 30: rubber part C: paper cassette

P: Paper

The present invention relates to a method of aligning a sheet of paper before feeding paper between the photosensitive member and the transfer separator in the paper feeding section, and in particular, the paper is reliably resisted even in an abnormal feeding condition in which the leading edge of the paper has an upcall or a downcall. A method for identifying a sheet of paper in an electrophotographic copying machine is provided.

Conventional electrophotographic photocopiers use an optical system including an exposure lamp 1, a mirror 2, 3, and a lens 4 as the first diagram, and when the contents of the document 0 are imaged on the photosensitive member 5, a developing part ( 6) the toner is supplied and coated on the image and developed. Meanwhile, the paper P is fed along the upper or lower paper guides 8, 9 and 10 by the paper feed roller 7 from the paper cassette C. The contents (images) on the photosensitive member 5, which are transferred to the photosensitive member 5 and coated with toner, are transferred onto the paper P by the transfer separator 11, and the paper P passes through the fixing unit 12. As a result, the transferred image is fixed and finally discharged onto the stacker 14 by the discharge roller 13 so as to be deposited.

The paper P fed from the cassette C during the above feeding process may be meandering and the tip may not coincide. Thus, the paper P being unstablely conveyed is exposed to the photosensitive member 5. In order to ensure that the paper is conveyed accurately, a paper alignment method is adopted in which upper and lower register rollers (15, 16) are provided between the tip of the paper guides (8), (9) and (10) and the photosensitive member (5) to correct the feeding state. It is.

In the conventional paper sorting method, the upper register roller 15 is made of rubber and the lower register roller 16 is made of steel, and these register rollers 15, 16 are made of paper P from the beginning of paper feeding. After the end of (P) contacts the register rollers (15) and (16), the end of the paper (P) is kept in a constant state until a predetermined time elapses. After contact with, the paper P is driven until a certain time has elapsed so that the paper P is cleared between the upper and lower paper guides 8 and 9 or between the upper paper guide 8 and the upper auxiliary guide 10. While the tip is aligned so as to be parallel to the register roller (l5) (16) and the photosensitive member (5), and after a certain time passes in a looped state, the register roller (15) (16) is rotated so that the paper (P) is exposed to the photosensitive member. The paper P is brought to the side so that its tip coincides with the latent image on the photoreceptor 5. .

In this paper alignment process, as shown in FIG. 2C, immediately before the paper P clears the above-mentioned loop, the tip portion naturally slides while touching the steel lower register roller 16 so that the upper and lower register rollers 15 (16) It is ideal to be pushed through.

However, in general, the paper P is curled due to the storage and stacking condition or heat during copying. In the case of upward or downward curling as shown in 2a and b, the paper P and the end roller ( 15) Since the normal slip does not freeze between (16), the paper (P) does not enter between the register rollers (15) and (16), and is further dried, so that it is not transported to the photosensitive member (5) side so that no copy is made. do.

On the other hand, it is possible to consider the case where the register rollers 15 and 16 are all made of rubber, but even in this case, wrinkles are likely to occur in the paper and ideal paper alignment cannot be achieved.

Therefore, the present invention is to solve the above problems, and even in the presence of the curl in the front end of the paper can align the paper reliably so that the copying method in the electrophotographic copier which can always make a smooth copy without jamming the paper. Is to provide.

The object of the present invention is to provide an upper and lower register rollers between a photo guide and a photo guide for guiding the paper supplied by the paper feed roller from the paper cassette, so that these register rollers are brought into contact with the register roller from the beginning of the paper feed. The paper feed roller is held at a stop state for a certain period of time and then driven until the paper leading edge touches the register roller and then elapses for a certain period of time so that the paper clears the loop between the upper and lower paper guides or between the upper paper guide and the upper auxiliary roller. The upper and lower register rollers are arranged in an electrophotographic copying machine in which the front end is aligned so as to be parallel to the register roller and the photosensitive member, and the paper is moved to the photosensitive member by driving the register roller after a predetermined time has elapsed in a looped state. Thrill on its outer circumference That the rubber part is formed alternately, but is achieved by ensuring that it rotates in contact with the rubber part and the steel part of the steel part and the lower register roller rubber portion of the upper register roller align the leading end of paper is being fed by the paper feed roller.

In addition, the top edge of the paper is inserted by the rubber part of the upper register roller in the state where the up curl is formed, and the bottom of the paper is inserted by the rubber part of the lower register roller. To be transported to the side.

Hereinafter, a paper alignment method of an electrophotographic copying machine according to the present invention will be described in detail as an embodiment shown in FIGS. 3 and 4.

FIG. 3 shows a paper alignment state according to the present invention at the time of upper feeding, and FIG. 4 shows a paper alignment state at the time of lower feeding, and the paper supplied by the paper feed roller 21 from the paper cassette c ( P is contacted between the top and bottom register rollers 25 and 26 provided between the tip of the paper guides 22, 23 and 24 and the photosensitive member (not shown), and then the register roller 25 ( 26 is stopped and the feed roller 21 is rotated until a predetermined time elapses after the leading end of the paper P is connected to the register rollers 25 and 26, so that the paper P is the upper paper guide 22. ) And the upper end guide (24) or between the upper and lower paper guides (22) and (23) while the end is aligned in a state parallel to the register roller (25) (26) and the photosensitive member (not shown) After looping with paper (P), after a certain time has passed, the upper and lower register rollers (25) Reference numeral 26 is driven to transfer the paper P to the photosensitive member side.

Here, as shown in Figs. 3A and 4A, in the state in which the paper P is ideally conveyed without curling at its distal end, it slides in contact with the register rollers 25 and 26, and the upper and lower register rollers 25 and 26, respectively. Aligned by cutting in between.

By the way, the paper P is curled due to storage and stacking or heat during copying. In this case, when the upper curl is generated during upper feeding as shown in FIG. 3B, the tip of the paper P is large in the upper register roller 25. When the down-collar occurs during the upper feeding as in the 3c diagram, the tip of the paper P contacts the lower register roller 26 at a large angle, and the up-collar during the lower feed as in the 4b diagram. In this case, the leading end of the paper P comes in contact with the lower register roller 26 at a large angle. When the up curl occurs at the time of the lower feeding, as shown in FIG. 4B, the leading end of the paper P has the upper register roller ( 25) and the lower end of the paper (P) is in contact with the lower register roller 26 at a large angle in the case of a downward curl during lower feeding, as shown in the 4c degree bar, in the method of the present invention Steel parts 27 and 29 and rubber parts 28 and 30 are alternately formed on the outer circumferential surfaces of the upper and lower register rollers 25 and 26, respectively, so that the upper and lower register rollers 25 and 26 are respectively steel parts 27. (29) is in contact with the mating rubber parts (30) and (28) to rotate, so that the curled portion of the leading end of the paper (P) is in contact with the steel parts (27) and (29) of the upper and lower register rollers (25) and (26). When it comes into contact with the rubber parts 28, 30, it spreads out by the frictional force, intersects between the upper and lower register rollers 25, 26, and is aligned in parallel with the register rollers 25, 26 and the photoreceptor to the photoreceptor side. Since it is conveyed, the paper P is reliably aligned and conveyed without further curling or jamming.

In this case, the circumferential length of the rubber parts 28 and 30 may be set to be approximately equal to the amount of error at the leading edge of the copy paper P to the register rollers 25 and 26. Depending on the type, about 3-5 mm is preferable.

As described above, according to the present invention, even when an upward or downward curl occurs at the leading end of the paper P, the paper is aligned with the register rollers 25 and 26 and the photosensitive member without curling or jamming. Because it is surely transferred to the photosensitive member, it is possible to prevent the occurrence of radiation errors.

In the above-described embodiment, the steel parts 27 and 29 and the rubber parts 28 and 30 of the upper and lower register rollers 25 and 26 are shown to be divided up to the center of the roller, but the upper and lower register rollers 25 are not shown. Any configuration can be used as long as it is separated into a sterling portion 27, 29 and a rubber portion 28, 30 only on the outer circumferential surface of (26), and various modifications are possible within the technical spirit and scope of the present invention.

Claims (2)

The upper and lower register rollers are installed between the upper and lower parts and the upper paper guide and the photosensitive member for guiding the paper fed by the paper feed roller from the paper cassette. The feed roller is driven until the end of the paper touches the register roller until a certain time has elapsed so that the paper is aligned in parallel with the register roller and the photosensitive member. After a certain time, the register roller is driven to transfer the paper to the photosensitive side. In the method, the steel part and the rubber part are alternately formed on the outer circumferential surface of the upper and lower register rollers so that the steel part and the rubber part of the upper and lower register rollers come into contact with each other and the rubber part and the steel part are fed by the feeding roller. To align the paper Paper sorting method in an electrophotographic copier that. The paper alignment method according to claim 1, wherein the paper edge is interposed between the upper and lower register rollers by the rubber part of the upper or lower register rollers while the upper or lower curl is formed in the paper leading edge. .

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