JPH02198935A - Paper feeding device - Google Patents

Abstract

PURPOSE:To carry out the smooth paper feed by installing a guide member contacts a supplied paper which is taken out on the start of paper feed and shifts so as to guide the paper along a bent transport passage, moved by the supplied paper, on the side of a paper feeding roller. CONSTITUTION:On the start of paper feed, a paper feeding roller 4 contacts an uppermost paper 6, and the guide rollers 3 and 3' of guide means 30 stand still, with arms 2 and 2' in balanced state, sufficiently separating for the paper 6, and the rollers 3 and 3' do not contact the paper 6. The uppermost paper 6 is taken out from a paper feeding cassette 5 by the revolution of the roller 4, and at the time point when the top edge part of the paper 6 protrudes into a bent transport passage 7, the upper surfaces of the right and left edge parts of the paper 6 contact the right and guide rollers 3 and 3', and advance, switching the guide rollers 3 and 3' around a shaft 1. During this time, the guide rollers 3 and 3' correct the bending at the right and left edges of the paper and guide the paper 6 along the bent transport passage 7.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a paper feeding device employed in a copying machine, a printer, etc. The present invention relates to a paper feeding device that feeds paper along a conveyance path.

[Conventional technology]

Conventional paper feeding devices of this type include, for example, the devices shown in FIGS. 8 and 9, and the devices shown in FIGS. 10 and 11.

The paper feeding device shown in FIGS. 8 and 9 has a paper feeding roller 4, which pulls out the sheets 6 stacked in a paper feeding cassette 5 and feeds them along a curved conveyance W17. do. Guide collars 8 are provided on both sides of the paper feed roller 4 and are rotatably fitted onto the drive shaft l of the roller 4, and the radius R' of the collars 8 is equal to the radius R of the paper feed roller 4.

Further, according to the paper feeding device shown in FIGS. 10 and 11, a guide collar 8 fitted to the drive shaft 1 of the paper feeding roller 4
The outer radius RIf is formed to be sufficiently smaller than the radius R of the paper feed roller 4.

[Problem to be solved by the invention]

However, in the case of the apparatuses shown in FIGS. 8 and 9, the guide collar 8 is already in contact with the paper 6 at the start of paper feeding, and the paper cannot be pressed against the paper feed roller 4 sufficiently, resulting in paper feeding errors. There is a problem that occurs.

In order to solve this problem, if the paper push-up blade is strengthened, the paper conveyance force under the top paper increases, causing double feeding.

In addition, in the case of the apparatuses shown in FIG. 1O and FIG. 11, after the start of paper feeding, portions A and B, which are both the left and right ends of the paper 6, become lifted up, and as in the upper paper shown in FIG. The entry resistance into the path 7 and the conveying resistance in the conveying path increase accordingly. Therefore, in the case of so-called center feeding in which the central portion of the paper is driven by the paper feeding roller 4, feeding errors occur. In addition, in the case of the so-called one-sided paper feeding standard in which the paper is driven by the roller 4 at a position shifted to one side from the center of the paper, the roller 4 is located on the paper passing reference side with respect to the center of the paper, so the roller 4 is A moment is generated in the paper, which not only causes skew but also causes a paper feeding error as in the case of center paper feeding.

Therefore, the present invention is a paper feeding device of a type in which a stacked paper is pulled out by a paper feeding roller and fed along a curved conveyance path immediately behind the paper feeding roller. It is an object of the present invention to provide a paper feeding device that is capable of smooth paper feeding with less occurrence of jams, has a simple structure, and can be provided at low cost.

[Means for Solving the Problems] In accordance with the above-mentioned object, the present invention provides a paper feeding device in which a stacked paper is pulled out by a paper feeding roller and is fed along a curved conveyance path immediately after the paper feeding roller. At the start of paper feeding, the paper does not come into contact with the paper to be fed, and after the start of paper feeding, it contacts the paper that has been pulled out and moves the paper to be fed along the curved conveyance path. The present invention provides a paper feeding device characterized in that a conveyance guide member that moves in a guiding manner is provided on a side of the paper feeding roller.

[For production]

According to the paper feeding device of the present invention, the stacked papers are pulled out by the paper feeding roller and begin to be fed into the curved conveyance path immediately after the paper feeding. After the paper feed roller starts feeding, the fed paper that has been pulled out comes into contact with the conveyance guide member and further advances while moving the guide member along the curved conveyance path. By being moved along the curved conveyance path in this manner, the conveyance guide member guides the supplied paper along the curved conveyance path while correcting the paper to avoid large unnecessary bends.

〔Example〕

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

1 to 4 show one embodiment of the present invention.

This paper feeding device is used in copying machines, printers, etc., and the paper 6 stacked in a paper feeding cassette 5 is fed by a spring 6.
1 to bring it into contact with the paper feed roller 4.

The paper feed roller 4 is supported by a drive shaft 1, and this shaft 1 is driven by a drive source (not shown).

Conveyance guide members 3.3 are arranged on both sides of the roller 4 so as to face portions A and B, which are the left and right end portions of the paper 6, respectively. Each guide member 3 is formed in the shape of a roller, and is rotatably supported by the arm 2. Arm 2 is arm 2'
The roller 4 is integrally formed as a pair with the roller 4, and is swingably supported on the shaft 1 of the roller 4. A roller 3' similar to the roller 3 is also rotatably provided on the arm 2'.

Distance L1 from the center of shaft 1 to the tip of roller 3.3' and distance 1%1lL2 from the center of shaft 1 to the tip of arm 2.2'
The relationship between Ll and L2 is set so that Ll>L2. Because of this relationship, the arm 2.2' will not interfere with the paper. Further, the dimension L1 is set equal to the radius R of the paper feed roller 4.

A set of rollers 3.3' and arms 2.2 supporting them
' constitutes a guide means 30.

1 and 2 show the state just at the beginning of paper feeding. At this time, the paper feed roller 4 is in contact with the uppermost paper 6, and the guide roller 3.3' of each guide means 30
The arm 2.2' is at rest with a sufficient distance from the paper 6 in a balanced state. That is, at the start of paper feeding, the rollers 3, 3' are placed in a state in which they do not contact the paper 6.

Thus, the uppermost paper 6 is pulled out from the paper feed cassette 5 by the rotation of the roller 40 and sent into the curved conveyance path 7 along the roller 4. As shown in FIG. 4, when the leading end of the paper 6 is about to enter the bent conveyance path 7, the upper surfaces of the left and right ends of the paper come into contact with the left and right guide rollers 3.3, and the guide rollers are moved along the shaft 1. Proceed further while swinging around. During this time, the guide rollers 3.3 guide the paper 6 along the curved conveyance path 7 while correcting the bends at the left and right ends of the paper 6. In addition, as the guide roller 3.3 swings, the rear guide rollers 3' and 3' also swing at the same time.
Both left and right ends of the paper 6 are held down from above so that they do not bend after paper feeding is started.

In each guide means 30, once the roller 3.3' swings upward to a certain extent, it does not rise any further due to the weight of the roller 3.3' and the arm 2.2'.

When the trailing edge of the sheet 6 has passed the guide roller 3.3, the guide rollers 3.3 and 3', 3' return to their original state shown in FIG.

In this way, the guide rollers 3.3 and 3'3' are not in contact with the paper 6 when paper feeding starts, so there is no possibility of paper feeding errors or double feeding caused by the guide rollers being in contact with the paper at the beginning of paper feeding. ordering will be prevented.

Also, after the paper feed starts, the left and right ends of the paper 6 are aligned with the guide rollers 3.
．． 3', the bend is corrected so that it becomes shallow, and it enters the bent conveyance path 7 as shown by J, , L, and M in FIG. The resistance is reduced, and as a result, paper feeding errors, skews, and jams are significantly less likely to occur than in the case where the paper is fed into the curved conveyance path without correction of the mark and is subjected to a large conveyance resistance.

In addition, in each guide means, guide rollers 3 and 3
It is also possible to change `` to an appropriate weight.

5 and 6 respectively show other embodiments, and FIG. 5 shows a case of center paper feeding in which the paper feed roller 4 is arranged in the center, and the same as that shown in FIG. 1 is shown. , guide means 30 including guide rollers 3 and the like are arranged symmetrically on both sides of the roller 4.

The apparatus shown in FIG. 6 is based on one-sided paper passing, and the paper feed roller 4 is disposed slightly offset from the center of the maximum paper passing width toward the paper passing reference side. In this case, the guide means 30 including the guide roller 3 etc. is provided, one on the paper passing standard side with respect to the roller 4, and one on the opposite side of the roller 4, or a small size paper (35), a large size paper (LS), etc. ) is shown in an example where two are arranged to correspond to each of them.

FIG. 7 shows yet another embodiment.

In this paper feeding device, a shaft 20 is provided above and in front of the paper feeding roller 4, and conveyance guide members 300 are swingably supported on portions of the shaft 20 facing the left and right ends of the paper 6, respectively. (Only the front one is shown in Figure 7).

The lower end of each member 300 is smoothly formed into an arc shape when viewed from the side, and can swing in parallel to the curved conveyance path 70.

Each member 300 is normally placed at a position PI shown in FIG. 7 by its own weight, facing the entrance of the curved conveyance path 70.

After the paper feed roller 4 starts feeding, when the leading edge of the paper 6 reaches this member 300, each member 300 swings along the conveyance path 70 as the paper 6 advances, and the left and right ends of the paper 6 The bending is corrected to help the paper 6 move smoothly along the conveyance path 70. As the paper 6 advances, each member 300 swings upward to position P2 shown in FIG. 7, but does not rise any further due to its own weight. When the rear end of the paper 6 leaves the member 300, each member 300 returns to its original position PI due to its own weight.

〔Effect of the invention〕

According to the present invention, there is provided a paper feeding device of a type in which a stacked paper is pulled out by a paper feeding roller and fed along a curved conveyance path immediately behind the paper feeding roller, and the skew is lower than that of a conventional device of this type. Furthermore, it is possible to provide a paper feeding device that can smoothly feed paper with less occurrence of jams, has a simple structure, and can be obtained at low cost.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention. Figure 1 is a front view, Figure 2 is a side view of the main parts, and Figure 3 shows how the conveyance guide roller is installed. The exploded perspective view and FIG. 4 are explanatory views of the operation of the conveyance guide roller. 5 and 6 are front views of other embodiments, respectively. FIG. 7 is a schematic side view of yet another embodiment. Figures 8 and 9
The figure is an explanatory diagram of a conventional example, and FIGS. 10 and 11 are explanatory diagrams of still other conventional examples. 30... Guide means, 3.3'... Conveyance guide roller, 300... Conveyance guide member, 4... Paper feed roller, 6... Paper, 7.70... Curved conveyance path. Applicant: Minolta Camera Co., Ltd. 7...Curved conveyance path Figure 300...Conveyance guide member 70...Curved conveyance path Figure 10 Figure 11

Claims (1)

[Claims] (1) In a paper feeding device in which a stacked paper is pulled out by a paper feeding roller and is fed along a curved conveyance path immediately after the paper feeding roller, when the paper feeding roller starts feeding paper, the paper does not come into contact with the paper to be fed. After the paper feed starts, the paper feeder moves a conveyance guide member that comes into contact with the drawn paper and guides the paper along the curved conveyance path while being moved by the paper. A paper feeding device characterized in that it is provided on the side of a roller.