JPS6212554A - Paper feeding device - Google Patents

Abstract

PURPOSE:To prevent a sheet of paper from developing a curling tendency when correcting skewing by holding the end of said sheet of paper between a conveying rotary body and a pinch rotary body. CONSTITUTION:Documents delivered by means of the rotation of a delivery roller 15, are held between a paper feed roller 19 and a handling roller 21, and separated one by one by the rotation of the roller 21. While the documents are being conveyed on a conveying passage LO, the driving of a motor 23 for the paper feed roller is stopped, the magnetism of a solenoid 25 is erased, while, on the other hand, the driving of a motor 33 for a conveying roller is started. The front end of a document is held between the conveying roller 29 and a pinch roller 31, and at the same time the driving of the motor 33 for the conveying roller is started, the driving of the motor 23 for the paper feed roller is stopped while the magnetism of the solenoid 25 is erased, releasing the hold of the rear part of the document. Thus, the hold of the front end and the release of the rear end of a document are simultaneously carried out, preventing the document from developing a curling tendency.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a paper feeding device that feeds paper along a conveying direction, and particularly to a paper feeding device that feeds paper along a conveying direction, and in particular, a paper feeding device that temporarily stops the fed paper and then starts conveying the paper. Regarding a feeding device.

[Technical background of the invention]

Generally, in a paper feeding device, in order to correct paper skew, the fed paper is brought into contact with the rolling contact section between the transport roller and the pinch roller, and stopped once to correct the orientation of the paper. There is. Then, the paper whose skew has been corrected in this way is conveyed by rotation of the conveyance roller.

In such a paper feeding device, in order to correct skew, the entire leading edge of the paper must come into contact with the rolling contact portion between the vertical conveyance roller and the pinch roller. For this reason, the paper is further fed while being in contact with the rolling contact portion between the transport roller and the pinch roller, ensuring that the leading edge of the paper is in full contact with the rolling contact portion. .

[Problems with background technology]

In such a paper feeding device, although the skew of the paper is certainly corrected, the paper remains curled once it is stopped. In other words, the paper becomes curled. For this reason, paper that has curled in this way is very likely to cause paper jams on the subsequent conveyance path.
The operability of the device is extremely poor.

[Purpose of the invention]

This invention has been made in view of the above-mentioned circumstances, and an object of the invention is to provide paper that does not have a tendency to curl when correcting skew, thereby preventing the occurrence of paper jams. An object of the present invention is to provide a feeding device.

[Summary of the invention]

In order to achieve the above-mentioned object, the paper feeding device according to the present invention includes a paper feeding rotary body and a separating member that can freely approach and separate from the paper feeding rotary body, which is provided across a conveyance path through which paper is fed once. a rotating body, a conveying rotary body provided on the downstream side of the paper feeding rotary body along the paper conveyance direction across the conveyance path, and a pinch rotary body that is pressed against the conveying rotary body;
a first driving means for rotationally driving the sheet feeding rotary body; a second driving means for driving the separating rotary body toward and away from the sheet feeding rotary body; and a third driving means for rotationally driving the conveying rotary body. The paper is fed by the rotation of the paper feed rotor by the first drive means while the paper is held between the paper feed rotor and the separation rotor, and the leading edge of the paper is rotated by the transport rotation. The paper feed rotor is rotationally driven by the first drive means until the sheet comes into contact with the rolling contact portion between the body and the pinch rotor, and the paper is bent.
The separating rotary body is separated from the paper feeding rotary body by the third driving means, and the paper is no longer held between the sheets, and the conveying rotary body is slightly rotated by the third driving means, so that the conveying rotary body and the pinch rotary body are separated from each other. It is characterized in that the leading edge of the paper is held between them.

[Embodiments of the invention]

An embodiment of the paper feeding device according to the present invention will be described below.
When applied to the automatic document feeder of an electronic copying machine,
This will be explained in detail with reference to FIGS. 1 to 6.

As shown in FIG. 1, an automatic document feeder (hereinafter referred to as ADF
It is written as ) 5 is removably mounted.

The ADF 5 includes a separating section 7, a conveying section 9, a reversing section 11, and a paper ejecting section 13. The separating section 7 includes a feed roller 15 above the tray 17. Further, the document fed out by the feeding roller 15 is sent along the conveyance path LO. Here, a paper feed roller 19 and a separation roller 21 are provided at the base end of the conveyance path LO in the separating section 7 with the conveyance path interposed therebetween. This paper feed roller 1
Reference numeral 9 denotes a paper feed roller motor 23 as a first driving means.
It is rotated clockwise in the figure to supply paper. Further, the sorting row 521 is rotated by the drive motor 23 in a clockwise direction, that is, in a direction opposite to the direction in which the document is conveyed, and the paper feed roller 19
It can be attached to and separated from the This handling roller 21
is driven toward and away by a solenoid 25 serving as a second driving means. That is, the separation roller 21 is brought into pressure contact with the paper feed roller 19 by the excitation of the solenoid 25, and separated by demagnetization.

On the other hand, the portion of the conveyance path LO in the conveyance unit 9, that is, the conveyance path 1 downstream of the paper feed roller 19 along the document conveyance direction.
A conveyance roller 29 and a pinch roller 31 are provided at the portion 0 with the conveyance path LO sandwiched therebetween. This pinch roller 31 is mounted in pressure contact with the paper feed roller 29.

Further, the conveyance roller 29 is rotationally driven by a conveyance roller motor 33 serving as a third drive mechanism.

Note that a first sensor S1 is provided between the paper feed roller 19 and the transport roller 29 to detect the passage of a document.

In the separating section 7, the document placed on the tray 17 and fed out by the feeding roller 15 is fed by the rotation of the paper feed roller 19, and is separated into 1' sheets by the sorting roller 19, and transferred to the conveyance section. It is designed to be sent out on the 9th. Note that the original is set on the tray 17 with the original surface facing downward.

The conveying section 9 includes a conveying belt 39 stretched between a pair of rows 535 and 37. The leading edge of the document sent out from the separation unit 7 is once twisted by the conveyance roller 29 and the pinch roller 31, and then conveyed onto the platen glass 3 by the rotation of the conveyance roller 29. The platen glass 3 is moved toward the reversing section 11 in accordance with the above.

When this document passes the copying position, either the conveyor belt 39 is rotated in the opposite direction to convey the document in the opposite direction, or the document is reversed in the reversing section 8B11 and then conveyed over the platen glass 3 to the separating section 7 side. Then, place the original on the stopper 41,
Set it to the copy position.

In this way, when the original is set at the copying position on the platen glass 3, the conveyor belt 39 stops running.
The original is held in copy position. The original that has undergone the copying operation is transferred to the first transport path L defined between the platen glass 3 and the transport belt 39 as the transport belt 39 runs again.
1 is transported and then reversed again at the reversing section 9, or via the second transport path L2 provided in the paper discharging section 13,
The paper is discharged onto a paper discharge tray 43 provided above the conveyor belt 39.

Note that the conveying section 9 includes a frame 45 integrated with the paper discharging section 13 on the back side. This frame 45 is rotatably attached to the back of the main body of the copying machine 1 via a hinge. Therefore, when manually setting documents one by one on the platen glass 3, the transport section 9 and the paper ejection section 13
This is done by rotating the platen glass 3 around the hinge and opening the platen glass 3.

An opening 47 is formed in a portion of the frame 45 that faces the connecting portion of the first and second conveyance paths 11°L2, that is, the confluence portion.

The reversing unit 11 is provided to invert the original, which has been copied with the lower copy side on the platen glass 3, so that the opposite copy side faces downward and copies this side. The reversing unit 11 is connected to the copy I11 through the opening 47 of the frame 45.
It is removably attached to. This reversing section 11 is
As shown in FIG. 2, there is a lower guide 49 whose tip extends into the opening 47 and is placed on the main body of the copying machine 1, and a lower guide 49 is placed on the lower guide 49 so that its upper surface can be opened. It includes an upper guide 51 and an inversion guide 53 sandwiched between upper and lower guides 49 and 51. The upper guide 49 is rotatably attached to the lower guide 49 via a pivot shaft 55.

A space is formed between the tip of the lower guide 49, the rear end of the frame 45, and the tip of the upper guide 51, and a conveyance guide 57 is provided in this space. The upper part of the space vertically divided by the transport guide 57 is defined as a third transport path L3, and the lower part is defined as a fourth transport path L4. On the other hand, a U-shaped fifth
It is defined as the transport path L5. The proximal end of the fifth transport path L5 is connected to the fourth transport path L4, and the distal end of the fifth transport path L5 is connected to the third transport path L3. Incidentally, this fifth conveyance path 5 is provided with a second document detection sensor S2 for detecting that the document passes therethrough. At the tip of the lower guide 49 described above, a conveyance path switching device 59 is provided that controls switching of the document conveyance direction at the merging portion of the first to fourth conveyance paths 11 to L4.

The automatic document feeder configured as described above will be explained below.

When you press the copy start button (not shown), the feed roller 1
5 engages with the topmost sheet of originals placed on the tray 17. By the rotation of the feed roller 15, the document is fed along the conveyance path 10 toward the rolling contact portion of the paper feed roller 19 and the separation roller 21.

Note that by pressing the copy button described above, the paper feed roller motor 23 is driven, and the paper feed roller 19 is rotated. Further, the solenoid 25 is also energized, and the separation roller 21 is pressed against the paper feed roller 19. Here, the transport roller motor 33 has not started driving.

In this state, the document fed out by the rotation of the feeding roller 15 is transferred to the paper feed roller 19 as shown in FIG.
The document is held between the document and the separating roller 21, and the document is separated into sheets one by one by rotation of the separating roller 21 in the clockwise direction.

Then, the document separated into one sheet is further fed along the conveyance path LO by the rotation of the feed roller 19 in the clockwise direction.

The first sensor S1 is turned on while this document is being conveyed through the conveyance path LO. Due to this ON operation of the first sensor S1, as shown in FIG. 2, after a predetermined time t1 has elapsed, the drive of the paper feed roller motor 23 is stopped.
The solenoid 24 is demagnetized, and on the other hand, the drive of the transport roller motor 33 is started.

Here, during the predetermined time t1 described above, after the leading edge of the original passes the first sensor S1, the leading edge of the original comes into contact with the rolling contact portion of the conveying row 529 and the pinch roller 31, and as shown in FIG. is set long enough for it to curl. By setting fllt1 at a predetermined time in this way, the entire leading edge of the document comes into contact with the rolling contact portion.

Therefore, at least at the leading edge of the document, the posture of the document is corrected.

Further, after the predetermined time t1 has elapsed, the conveyance roller motor 22 is driven for a predetermined time t2. Here, this predetermined time t
2 is set to a time sufficient for the leading edge of the document to be pinched between the conveyance roller 29 and the pinch roller 31. In this way, the leading edge of the document is held between the conveyance roller 29 and the pinch roller 31. Simultaneously with the start of driving of the paper feed roller motor 33, the drive of the paper feed roller motor 23 is stopped and the solenoid 25 is demagnetized, so that the rear part of the document is released from being held.

In this way, the front end of the document is held and the rear end is released at the same time. Therefore, the original is held in its correct posture by being held at the 1ti end, and the bending (loop) of the original is removed by releasing the rear part. That is, since the document is only bent for a short period of time, the document is prevented from being curled.

As described in detail above, according to this embodiment, although the document is bent between the transport roller 529 and the paper feed roller 19 in order to correct its posture, the time during which the document is bent is It is set short. That is, the manuscript is 1. Immediately after being bent, the leading end is held between the conveying roller 29 and the pinch row 531, and the separating roller 21 is moved to the feeding roller 19.
By moving away from the original, the rear part of the original is released and released, and the original is not curled.

Therefore, the document will not be jammed due to its curling tendency during subsequent conveyance operations.

This invention is not limited to the configuration of the one embodiment described above, and can be modified in various ways without departing from the gist of the invention.

For example, in the above-described embodiment, the driving of the transport roller motor 33 and the demagnetization of the solenoid 25 are performed simultaneously after a predetermined time t1 has passed since the first sensor S1 detects the leading edge of the document. However, the present invention is not limited to this, and the solenoid "25 may be demagnetized after the conveyance roller motor 33 starts to be driven."

Further, although it has been explained that the solenoid 25 is used as the second driving means, the second driving means is not limited to this, and any device that can drive the separating roller 21 toward and away from the paper feed roller 19 may be used. . Also, roller 19.21.2
9.31 etc. may be a rotating body such as a belt.

Further, although the paper feeding device of the present invention is applied to an automatic document feeding device, it can be applied to any device that corrects paper skew.

〔Effect of the invention〕

As described in detail above, the paper feeding device according to the present invention includes a paper feeding rotary body and a separating rotary body that can freely approach and separate from the paper feeding rotary body, which are provided on both sides of the conveyance path through which paper is conveyed. , a conveying rotary body, a pinch rotary body that is pressed against the conveying rotary body, and a pinch rotary body provided in pressure contact with the conveying rotary body, which are provided on the downstream side of the paper feed rotary body along the paper conveyance direction, across the conveyance path; and the paper feed rotary body. a first driving means for rotationally driving the paper-feeding rotary body, and a second driving means for driving the separating rotary body toward and away from the sheet feeding rotary body;
and a third driving means for rotationally driving the conveying rotary body, and the paper feeding rotary body is rotated by the first driving means while the paper is held between the paper feeding rotary body and the separating rotary body. The paper feed rotor is rotated by the first drive means until the leading edge of the paper comes into contact with the rolling contact portion of the transport rotor and the pinch rotor and the paper is bent. The separating rotary body is separated from the paper feed rotary body by the driving means to release the paper from being held, and the third driving means rotates the conveying rotary body slightly so that the conveying rotary body and the pinch rotary body are separated from each other. It is characterized in that the leading edge of the paper is held between them. Therefore, according to the present invention, there is provided a paper feeding device that prevents paper from curling during skew correction and prevents paper jams from occurring.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing the configuration of an automatic document feeder to which an embodiment of the paper feeder according to the present invention is applied, and FIG. 2 is a side view of a drive unit for correcting the skew of a document. Timing chart. Figure 3 is a side view showing the state before the original contacts the rolling contact between the transport roller and pinch roller. Figure 4 shows the state where the original comes into contact with the rolling contact and is sagged. FIG. 5 is a side view showing the state immediately after the leading edge of the document is held between the conveying roller and the pinch roller and the rear part of the document is released from being held between the paper feed roller and the separation roller; , FIG. 6 is a side view showing a state a little time has elapsed from the state shown in FIG. 5. 19... Paper feed roller (paper feed rotating body), 21... Sorting roller (sorting rotating body), 23... Paper feeding roller motor (first driving means), 25... Solenoid (first drive means),... 2), 29...conveyance roller (conveyance rotating body), 31
. . . pinch roller (pinch rotating body), 33 . . . conveyance roller motor (third driving means).

Claims (1)

[Scope of Claims] A paper feeding rotary body provided across a conveyance path through which paper is conveyed, a sorting rotary body that can freely approach and separate from the paper feed rotary body, and a direction in which paper is conveyed from this paper feed rotary body. a conveyance rotary body and a pinch rotary body that is pressed against the conveyance rotary body, which are provided on the downstream side along the conveyance path, and a first driving means for rotationally driving the paper feed rotary body; a second drive unit for driving the sorting rotary body toward and away from the paper feed rotary body;
and a third drive means for rotationally driving the conveying rotary body, and the paper is fed by the first drive means while being held between the paper feed rotary body and the separation rotary body. Paper is fed by the rotation of the paper rotating body, and the paper feeding rotating body is rotationally driven by the first driving means until the leading edge of the paper comes into contact with the rolling contact portion of the conveying rotating body and the pinch rotating body and the paper is bent. Thereafter, the second driving means separates the separating rotary body from the paper feeding rotary body to release the paper, and the third driving means rotates the conveying rotary body slightly to separate it from the conveying rotary body. A paper feeding device characterized in that the leading edge of the paper is pinched between a pinch rotating body.