JP3429114B2 - Paper ejection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet ejection device for ejecting a sheet by a sheet ejection roller and a pressure roller that comes into pressure contact with the sheet ejection roller.

[0002]

2. Description of the Related Art A recording device such as a copying machine, a facsimile device, a printer device, etc. is provided as a device provided with the above-mentioned paper discharge device.

In these recording apparatuses, a document after being taken into the apparatus and having image information read by a scanner or the like,
In order to discharge the processed paper such as recording paper after recording the image information to the outside of the apparatus, a paper discharge device including a discharge roller and a pressure roller that pressurizes and abuts on the end of the paper transport path. I have it.

The paper discharged from the paper discharge device onto a paper tray provided outside is held by a paper discharge roller and a pressure roller, and is rotated by the rotation of these rollers in the paper discharge rotation direction. However, when the trailing edge of the ejected paper sheet is released from being held by the paper ejection roller and the pressure roller, the force for further ejecting the paper sheet to the outside disappears.

On the other hand, the leading edge of the paper being discharged,
There is friction between the paper tray and the paper that has already been discharged onto the paper tray, which prevents discharge of the paper that is being discharged.

For this reason, the trailing edge of the ejected paper does not fall onto the paper tray and remains on the paper ejection roller, hindering ejection of the next ejected paper, or the next ejection. The generated sheet also digs into the lower side of the sheet that has climbed onto the sheet discharge roller, and the sheet cannot be discharged in page order.

In order to solve the problem, the actual development 60-1
As seen in Japanese Laid-Open Patent Publication No. 83754 and Japanese Patent Laid-Open No. 6-64814, a blade is provided for ejecting the trailing edge of the discharged sheet in the sheet discharging direction so that the trailing edge of the sheet does not remain on the sheet discharging roller. There is a vehicle such as a car in which a paper discharging rotating body is attached to a paper discharging roller shaft or a pressure roller shaft. In addition to these, various types of paper delivery rotating bodies such as rubber rollers and sponge rollers formed in a gear shape in cross section have been proposed.

However, in the conventional paper discharge device provided with such a paper discharge rotator, after the paper is discharged, the paper discharge roller and the pressure roller are opposite to the paper discharge rotation direction as described below. Since the paper rotates in the paper rotation direction, there is a problem that the paper is caught in the paper delivery rotating body and is not discharged.

That is, the paper discharge roller and the pressure roller of the paper discharge device do not usually have a dedicated drive motor for rotationally driving them, but separate the stacked sheets one by one. The drive motor is shared with other rollers such as a separating roller for feeding, a feeding roller for feeding the paper and feeding it to the separating roller, and a conveying roller for feeding the separated paper for processing in the apparatus.

In this case, the separation roller needs to be rotated only when the paper is separated, and is stopped when the paper is conveyed and discharged, that is, when the conveyance roller and the paper discharge roller are rotating. There is a need.

For this reason, the separation roller is attached to the separation roller shaft via a one-way clutch, and when the drive motor rotates the transport roller and the paper discharge roller in the transport rotation direction and the discharge rotation direction, the separation motor is driven by the drive motor. While the rotational force is prevented from being transmitted to the separation roller by the one-way clutch, when the separation roller is rotated to separate the paper, the drive motor is reversely rotated to connect the one-way clutch and the separation roller is rotated in the separation rotation direction. I am trying to let you. Therefore, when the separation roller rotates, the conveyance roller rotates in the reverse direction, but when the paper processed by the recording device is in the position related to the separation roller, it is not in the position related to the conveyance roller or the paper discharge roller and is conveyed. When it is in a position related to the roller and the paper discharge roller, there is no problem because it is not in a position related to the separation roller.

Further, the feeding roller contacting the lower surface of the stacked sheets that have been raised to the operating position does not interfere with the protruding feeding roller when the next sheet is set after the completion of discharging the sheet. Even when operating the mechanism that lowers it to the standby position, the drive motor rotates the transport roller and the discharge roller in the transport rotation direction and the direction opposite to the discharge rotation direction.

As a result, as shown in FIG. 6 (a), a gear-shaped sheet-discharging rotating body 2 attached to the sheet-discharging roller shaft 1 and formed of a foam material such as sponge which is a flexible elastic body.
When the sheet P is discharged, the sheet P is rotated in the same sheet discharge rotation direction A as the pressure roller 3 and the sheet discharge roller to try to discharge the sheet P. However, when the paper discharge roller and the pressure roller 3 rotate in the anti-paper discharge rotation direction B, the paper discharge rotator 2 originally intended to discharge the paper to the outside as shown in FIG. The trailing edge of the sheet once ejected may be caught in the ejection roller and the pressure roller. This is not limited to the case where the paper delivery rotating body 2 is in the shape of a gear formed of a foam material such as sponge which is the above-mentioned flexible elastic body, and the same applies to other forms such as the impeller. is there.

[0014]

As described above, there is a case in which the sheet discharging rotating body is provided, and the sheet discharging roller and the pressure roller may rotate in the direction opposite to the sheet discharging rotating direction. In the paper discharge device, there is a problem that the paper discharge rotating body, which is originally for discharging the paper to the outside, causes the trailing end of the discharged paper to be wound around the discharge roller and the pressure roller. .

The present invention has been made in view of the above circumstances, and provides a sheet discharging device in which a sheet that has already been discharged is not caught by a sheet discharging roller and a discharging roller and a pressure roller. With the goal.

[0016]

In order to achieve the above object, a sheet discharging device according to claim 1 is a sheet discharging roller attached to a sheet discharging roller shaft and a sheet discharging roller attached to a pressure roller shaft. The pressure roller that presses against and discharges the paper held by those rollers by rotating in the paper discharge rotation direction, and is formed of a flexible elastic body in a paper discharge device that rotates in the reverse direction after paper discharge, The paper ejection roller shaft is inserted between the paper ejection roller shaft supporting member that pivotally supports the paper ejection roller shaft and the paper ejection roller, and is gently held by the paper ejection roller shaft supporting member and the paper ejection roller. Was done,
A paper delivery rotating body for delivering the trailing end of the ejected paper in the paper ejection direction is provided, and on the side surface of the paper delivery rotating body around the shaft hole through which the paper ejection roller shaft of the paper ejection roller shaft support member is inserted. When the sheet delivery rotating body tries to rotate in the counter sheet discharge rotation direction at the contact position, the support member side locking claws that bite into the side surface of the sheet delivery rotation body to prevent the rotation in the counter sheet discharge rotation direction. On the other hand, at the position where the end surface of the paper discharge roller is in contact with the side surface of the paper discharge rotating body, when the paper discharge roller rotates in the paper discharge rotation direction, it bites into the side surface of the paper discharging rotary body. A roller-side locking claw that integrally rotates the paper discharge roller and the paper delivery rotating body is formed.

According to a second aspect of the present invention, there is provided a paper discharge device in which a paper discharge roller mounted on a paper discharge roller shaft and a pressure roller mounted on a pressure roller shaft and in pressure contact with the paper discharge roller rotate. In the paper ejecting device that ejects the paper held by those rollers by rotating in the direction, and rotates in the reverse direction after ejecting the paper, the press roller shaft of the pressure roller shaft is formed by a flexible elastic body. The trailing end of the discharged paper, which is inserted between the pressure roller shaft supporting member supporting the shaft and the pressure roller, and is gently held by the pressure roller shaft supporting member and the pressure roller, is discharged. A sheet payout rotator for paying out in a direction, and the sheet payout rotator is provided at a position in contact with a side surface of the sheet payout rotator around a shaft hole through which the pressure roller shaft of the pressure roller shaft support member is inserted. Let's rotate in the opposite direction In this case, the support member side engaging claws that bite into the side surface of the sheet delivery rotating body to prevent rotation in the direction opposite to the sheet discharge rotation direction are formed, while the side surface of the sheet delivery rotating body at the end surface of the pressure roller is formed. When the pressure roller rotates in the paper discharge rotation direction at a position contacting with, the roller side that bites into the side surface of the paper delivery rotating body and integrally rotates the pressure roller and the paper delivery rotating body. It is characterized in that a locking claw is formed.

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
Embodiments of the present invention will be described in detail.

FIG. 1 is a perspective view showing a sheet ejection device according to the first embodiment of the present invention. This paper discharge device is provided at the end of the paper transport path of a recording device (not shown), and discharges the paper processed by the recording device onto a paper tray (not shown).

In FIG. 1, the paper discharge roller 5 is attached to the paper discharge roller shaft 1 and rotates integrally with the paper discharge roller shaft 1. The pressure roller 3 is attached to the pressure roller shaft 4,
It comes into pressure contact with the discharge roller 5 and rotates integrally with the pressure roller shaft 4. These rollers are rotationally driven by a drive motor common to the separation roller of the separation feeding unit of the recording apparatus, the conveyance roller of the paper conveyance unit, etc., and the separation roller is rotated in the rotation direction for separating and feeding the paper. When rotating, it rotates in the anti-paper discharge rotation direction B.

A gear-shaped sheet delivery rotating body 2 formed of a flexible elastic body such as a sponge is attached to the sheet discharge roller shaft 1 via a one-way clutch 6.
The one-way clutch 6 locks the paper delivery rotating body 2 at one end of a spiral spring wound to have a diameter substantially the same as that of the paper discharge roller shaft 1, and the paper discharge roller shaft 1 tightens the spiral spring (internal diameter: When the paper is rotated in the direction of (decreasing) (paper discharge rotation direction A), the inner surface of the spiral spring is the paper discharge roller shaft 1
In a direction in which the paper discharge rotating body 2 and the paper discharge roller shaft 1 are coupled and rotated integrally, and the paper discharge roller shaft 1 loosens its helical spring (increases the inner diameter) (anti-paper discharge rotation direction). When rotated to B), the inner surface of the spiral spring is slightly separated from the paper discharge roller shaft 1 to release the connection between the paper discharge rotation body 2 and the paper discharge roller shaft 1 and the rotation of the paper discharge rotation body 2. It uses a known one to stop.

As a result, the discharge roller 5 and the pressure roller 3 rotate in the respective discharge rotation directions A,
The paper nipped by the rollers is discharged onto the paper tray as in the conventional case. Further, the paper delivery rotating body 2 contacts the paper while expanding and contracting, catches the trailing end of the paper ejected between the teeth of the gears, and ejects the paper in the paper ejection direction.

On the other hand, when the paper discharge roller 5 and the pressure roller 3 rotate in the anti-paper discharge rotation direction B after the paper discharge is completed, the paper discharge rotator 2 is not rotated by the one-way clutch 6, and thus the paper is discharged. It is possible to prevent the paper from being caught in the paper discharge roller 5 and the pressure roller 3.

In the first embodiment described above, the paper delivery rotating body 2 is attached to the paper delivery roller shaft 1 via the one-way clutch 6, but the paper delivery roller 5 is further delivered via another one-way clutch. By attaching to the paper roller shaft 1 so that the paper can be rotated only in the paper discharge rotation direction A similarly to the paper discharge rotating body 2, the discharged paper can be prevented from being caught by the paper discharge roller 5 and the pressure roller 3. It can be prevented more reliably.

Although it is not easy to secure a space for mounting the one-way clutch, the paper-discharging rotating body 2 is integrally mounted on the paper-discharging roller 5, and the paper-discharging roller 1 is connected to the paper-discharging roller shaft 1 via the one-way clutch. If it can be rotated only in the paper discharge rotation direction A by attaching to
Not only is it possible to reliably prevent the discharged paper from being caught in the paper discharge roller 5 and the pressure roller 3,
The one-way clutch is used for the paper delivery rotating body 2 and the paper discharge roller 5.
Since it can be used in common, it is possible to reduce the number of one-way clutches to be used and reduce the cost.

FIG. 2 is a perspective view showing a sheet ejection device according to the second embodiment of the present invention. In this paper ejection device, the paper ejection rotary member 2 is not attached to the paper ejection roller shaft 1 via the one-way clutch 6 as in the first embodiment, but the paper ejection rotational member 2 is connected to the one-way clutch 6 instead.
It is attached to the pressure roller shaft 4 via. The rest of the configuration is the same as that of the first embodiment, and therefore its explanation is omitted.

In the figure, a gear-shaped sheet delivery rotating body 2 formed of a flexible elastic body such as a sponge is attached to a pressure roller shaft 4 via a one-way clutch 6 so as to rotate only in the sheet discharge rotation direction A. It is installed.

As a result, when the paper discharge roller 5 and the pressure roller 3 rotate in the respective paper discharge rotation directions A,
The paper nipped by the rollers is discharged onto the paper tray as in the conventional case. Further, the sheet delivery rotating body 2 comes into contact with the sheet while expanding and contracting, catches the trailing end of the sheet discharged between the teeth of the gear, and delivers the sheet in the sheet discharge direction.

On the other hand, when the paper discharge roller 5 and the pressure roller 3 are rotated in the anti-paper discharge rotation direction B after the paper discharge is completed, the paper discharge rotator 2 is not rotated, so that the discharged paper is discharged. It is possible to prevent the roller 5 and the pressure roller 3 from being caught.

In the above-described second embodiment, the sheet pay-out rotator 2 is connected to the pressure roller shaft 4 via the one-way clutch 6.
However, if the pressure roller 5 is attached to the pressure roller shaft 4 via another one-way clutch so that the pressure roller 5 can rotate only in the paper discharge rotation direction A, like the paper discharge rotating body 2, It is possible to more reliably prevent the formed sheet from being caught by the sheet discharge roller 5 and the pressure roller 3.

Although it is not easy to secure a space for mounting the one-way clutch, the paper feeding rotating body 2 is integrally mounted on the pressure roller 3, and the pressure roller 3 is connected to the pressure roller shaft 4 via the one-way clutch. If it can be rotated only in the paper discharge rotation direction A by attaching to
Not only is it possible to reliably prevent the discharged paper from being caught in the paper discharge roller 5 and the pressure roller 3,
The one-way clutch is used for the paper delivery rotating body 2 and the pressure roller 3.
Since it can be used in common, it is possible to reduce the number of one-way clutches to be used and reduce the cost.

In the first and second embodiments described above, the paper-discharging rotary member 2 according to the present invention has a gear-shaped member formed of a flexible elastic material such as sponge. The present invention is not limited to this, and is similarly applicable to other forms such as an impeller.

Next, a third embodiment of the present invention will be described with reference to FIGS. 3, 4 and 5.

FIG. 3 is an assembly drawing of the pressure roller side of the paper discharge device according to the third embodiment of the present invention.

In the figure, a gear-shaped sheet delivery rotating body 2 formed of a flexible elastic body such as a sponge is inserted through a pressure roller shaft 4 to which a pressure roller 3 is attached.
The pressure roller shaft 4 is inserted into the shaft hole 7a of the pressure roller shaft support member 7 and is axially supported. In addition, the paper delivery rotating body 2
Is loosely sandwiched between the pressure roller 3 and the pressure roller shaft support member 7.

Pressure roller shaft 4 of pressure roller shaft support member 7
When the sheet payout rotator 2 tries to rotate in the anti-sheet discharge rotation direction B at a position in contact with the side surface of the sheet payout rotator 2 around the shaft hole 7a through which the sheet is inserted, A support member side locking claw 7b is formed to prevent the bite from biting and rotating in the anti-paper discharge rotation direction B.

A plurality of the support member side engaging claws 7b are formed on the circumference substantially concentric with the shaft hole 7a. The shape is such that it has a gentle slope in the paper discharge rotation direction A, and a substantially vertical steep slope in the anti-paper discharge rotation direction B.

On the other hand, when the pressure roller 3 rotates in the paper discharge rotation direction A at a position where the end surface 3a of the pressure roller 3 contacts the side surface of the paper delivery rotary body 2, the side surface of the paper delivery rotary body 2 is rotated. A roller-side locking claw 3b is formed which bites into the pressure roller 3 and integrally rotates the pressure roller 3 and the sheet payout rotator 2.

A plurality of the roller side engaging claws 3b are formed on the end surface 3a on a circumference substantially concentric with the pressure roller shaft 4. The shape is such that it has a gentle slope in the paper discharge rotation direction A, and a substantially vertical steep slope in the anti-paper discharge rotation direction B.

In FIG. 3, the paper-discharging rotary member 2 is inserted into the left and right of the pressure roller 3 of the pressure roller shaft 4, the pressure roller support member 7 is shown only on the right side, and the roller side locking claw 3b is shown. Although only the left side is shown, they are provided on the left and right sides, respectively, although not shown.

By configuring the pressure roller side in this way, the paper discharge device according to the third embodiment is
A discharge roller (not shown) with which the pressure roller 3 is in pressure contact,
When the pressure roller 3 rotates in the sheet discharge rotation direction A, the sheet nipped by these rollers is discharged.

At this time, the pressure roller 3 moves in the paper discharge rotation direction A.
In the case where the pressure roller support member 7 rotates, the sheet delivery rotary member 2 that is loosely sandwiched between the pressure roller 3 and the pressure roller support member 7, as shown in FIG. While sliding on the gentle slope of the pawl 7b, it bites into the raised slope of the roller-side locking pawl 3b of the pressure roller 3 and rotates integrally with the pressure roller 3 in the paper discharge rotation direction A.

On the contrary, when the pressure roller 3 rotates in the anti-paper discharge rotation direction B, as shown in FIG.
And the pressure roller support member 7 are loosely sandwiched between the paper delivery rotary member 2 and the pressure roller support member 7 while sliding on the gentle slope of the roller side locking claw 3b of the pressure roller 3 and the support member side of the pressure roller support member 7. The engaging claw 7b bites into the steep slope to prevent its rotation. That is, the paper delivery rotating body 2 does not rotate in the anti-paper discharge rotation direction B.

As a result, like the second embodiment,
When the paper discharge roller and the pressure roller 3 rotate in the counter paper discharge rotation direction B after the paper discharge is completed, the paper discharge rotator 2 does not rotate, so the discharged paper is transferred to the paper discharge roller and the pressure roller 3. It is possible to prevent being caught.

Further, in the second embodiment, the one-way clutch is required in order to prevent the paper delivery rotating body 2 from rotating in the anti-paper discharge rotation direction B, but in the third embodiment, the one-way clutch is required. While the pressing roller 3 and the pressing roller support member 7 are formed with locking claws, respectively, the same action as that of the clutch is formed, and at the same time, the sheet delivery rotating body 2 is sponged so as to bite into the steep slopes of these locking claws. Since it is realized by using a flexible elastic body such as, the rotation of the paper delivery rotating body 2 in the anti-paper discharge rotation direction B can be prevented with the same number of parts as the conventional one.

In the third embodiment described above, locking pawls are formed on the pressure roller and the pressure roller support member, and the paper is delivered and rotated to the pressure roller and the pressure roller support member. Although it is configured to hold the body, it is not limited to this.
The same action and effect can be obtained by forming locking pawls on the paper discharge roller and the paper discharge roller support member, and by sandwiching the paper discharge rotator between the paper discharge roller and the paper discharge roller support member. You can

[0053]

According to the first aspect of the present invention, the support member side locking claws and the roller side locking claws allow the paper delivery rotary member to rotate only in the paper discharge rotation direction without using a one-way clutch. Since it does not rotate in the anti-paper discharge rotation direction, it prevents the already discharged paper from being caught in the paper discharge roller and the pressure roller at a low cost without increasing the number of parts compared to the conventional paper discharge device. You can

According to the second aspect of the present invention, without using a one-way clutch, the support member side locking claws and the roller side locking claws cause the sheet delivery rotating member to rotate only in the sheet discharge rotation direction and to be discharged again. Since it does not rotate in the paper rotation direction,
It is possible to prevent the already discharged sheet from being caught by the sheet discharge roller and the pressure roller at a low cost without increasing the number of parts as compared with the conventional sheet discharge apparatus.

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[Brief description of drawings]

FIG. 1 is a perspective view showing a sheet ejection device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a sheet ejection device according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a paper ejection device according to a third embodiment of the invention.

FIG. 4 is a diagram for explaining the operation of the paper ejection device according to the third embodiment of the invention.

FIG. 5 is a diagram for explaining the operation of the sheet ejection device according to the third embodiment of the present invention together with FIG.

FIG. 6 is a diagram for explaining a problem of a conventional paper ejection device.

[Explanation of symbols]

1 Paper ejection roller shaft 2 Paper delivery rotating body 3 pressure roller 3a end face 3b Roller side locking claw 4 Pressure roller shaft 5 Paper ejection roller 6 one-way clutch 7 Pressure roller support member 7a Shaft hole 7b Support member side locking claw

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65H 29/22

Claims (2)

(57) [Claims] 1. A paper discharge roller attached to a paper discharge roller shaft, and a pressure roller attached to a pressure roller shaft that comes into pressure contact with the paper discharge roller are rotated by rotating in a paper discharge rotation direction. In a paper ejection device that ejects paper held by rollers and rotates in reverse after paper ejection, a paper ejection roller shaft support for supporting the paper ejection roller shaft of the paper ejection roller shaft formed of a flexible elastic body. A sheet delivery rotator that is inserted between a member and the sheet delivery roller and is loosely held by the sheet delivery roller shaft support member and the sheet delivery roller and delivers the trailing edge of the sheet to be delivered in the sheet delivery direction. The sheet discharge roller is rotated in the anti-sheet discharge rotation direction at a position in contact with the side surface of the sheet discharge rotor around the shaft hole through which the sheet discharge roller shaft of the sheet discharge roller shaft support member is inserted. If you decide to While forming a support member side locking claw that cuts into the side surface of the body and prevents rotation in the direction opposite to the paper discharge rotation direction, the paper discharge roller is located at a position where the end surface of the paper discharge roller contacts the side surface of the paper discharge rotation body. When the roller rotates in the paper discharge rotation direction, a roller-side locking claw that bites into the side surface of the paper discharge rotation body to integrally rotate the paper discharge roller and the paper discharge rotation body is formed. Characteristic paper ejection device. 2. A paper discharge roller attached to a paper discharge roller shaft and a pressure roller attached to a pressure roller shaft that comes into pressure contact with the paper discharge roller are rotated in the paper discharge rotation direction, thereby In a paper ejecting device that ejects a paper held by a roller and reversely rotates after ejecting the paper, a pressure roller shaft support that is formed of a flexible elastic body and that supports the pressure roller shaft of the pressure roller shaft. A sheet delivery rotator which is inserted between a member and the pressure roller and which is loosely held by the pressure roller shaft support member and the pressure roller and which delivers the rear end of the sheet to be discharged in the sheet discharge direction. The pressure roller shaft supporting member is configured to rotate in the anti-paper discharge rotation direction at a position in contact with a side surface of the paper discharging rotary member around a shaft hole through which the pressure roller shaft is inserted. If you decide to While forming a support member side locking claw that bites into the side surface of the body to prevent its rotation in the direction opposite to the paper discharge rotation direction, the pressure is applied to the end surface of the pressure roller at a position in contact with the side surface of the paper delivery rotation body. When the roller rotates in the paper discharge rotation direction, a roller-side locking claw that bites into the side surface of the paper delivery rotating body to integrally rotate the pressure roller and the paper delivery rotating body is formed. Characteristic paper ejection device.