JPH03227875A - Paper discharger - Google Patents

Abstract

PURPOSE:To shorten the paper conveying route and simplify the constitution by setting pressing force, by which a curl-removing unit is pressed to a discharge roller, different from pressing force by which a kickout roll is pressed to the discharge roller. CONSTITUTION:A discharge roller 1 is provided in six points with an almost equal space along a shaft 37 to continue fixed rotation by a discharge roller gear 41 only by a time necessary for conveying a paper form P. A curl-removing kickout unit 11 is brought into press contact with the roller 1 at about 450g pressing force by a pressure spring 6B, while a curl-removing unit 7 is brought into press contact with the roller 1 at about 900g pressing force by a pressure spring 6A. When the paper from P is advanced into this discharge roller part, the paper form P, whose generated curl is pressed to the periphery of the roller 1 by the units 7, 11, is discharged onto a discharge tray 13 while a curl part is corrected in a reverse direction, and a rear end of the paper form P, at the time of passing through a nip part, is kicked out by a kickout member 10 of a kickout roll 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a paper ejection device having a pair of ejection rollers for ejecting paper to a predetermined ejection tray.

(Old conventional technology) In recent years, with the development of various information devices such as computers,
Many output devices for this information have been developed. The number of users using these output devices is diverse, and the requirements for engraving on the output devices are also becoming more sophisticated. One of the most important of these problems is the IJF state of the paper after information is recorded on the paper, which has become a major problem.

In other words, there is the problem of how accurately and neatly the output paper is ejected, and this is extremely important when arranging the output paper in page order or sorting it by job. It's a deafening point.

In other words, the paper ejected from the output device is correctly placed on the predetermined ejection tray 1-6! In order to load the paper onto the output tray, it is desirable to have the following two major functions:
This is a curl removal mechanism that removes curls such as curls from the paper in order to load it further.The second function is to kick out the trailing edge of the paper to determine the position of the leading and trailing edges of the paper. This is a paper picking mechanism for aligning the paper.

An example of a conventional paper ejecting device equipped with this type of curl removing mechanism and paper kicking mechanism will be described with reference to FIG.

FIG. 7 shows a curl removing mechanism and a paper kicking mechanism in the ejection section of a conventional paper ejection device. In the figure, the ejection section includes a guide plate pair 51 that guides the paper P and a pair of guide plates 51 disposed on the downstream side thereof. A pair of decurling rollers 53 press against the discharge roller 52 and its circumferential surface with a predetermined pressing force.
, 55 is provided.

On the downstream side of this curl remover 411156, a plurality of rollers 59 fixed to the shaft 57 at appropriate intervals and a plurality of kicking rollers 60 that press the rollers 59 with a predetermined pressing force are arranged. There is. The kicking roller 60 is provided with kicking members 61 consisting of a plurality of protrusions at appropriate intervals at both ends that do not come into contact with the roller 59. The kicking roller 60 and the kicking roller 60 constitute a kicking mechanism 62.

The paper P with the desired image (information) recorded on the paper and discharged from the image forming section (not shown) and guided by the pair of guide plates 51 passes between the pair of curl removal rollers 52, 53, and 55. As a result, the upwardly convex curl remaining on the paper P is corrected. After the paper P passes the row 959 of the next kicking mechanism 62 and the nip of the kicking roller 50, the rear end of the paper is pushed out from the kicking member 61 of the kicking roller 60, so that the paper L] is discharged 1.
- It is kicked out and loaded onto Reiro 3.

A conventional paper ejection device or a decurling mechanism 5 as described above.
The reason why the kicking mechanism 62 and the kicking mechanism 62 are provided is that the pair of curl removal rollers 52, 53.
5 requires a very high contact force, and for this reason, the curl remover fl! When the roller 55 of the i56 is provided with a kicking member 6■ such as a kicking roller 60, the paper P
This is because the kicking out mechanism 62 for kicking out the paper P was required to avoid folding, streaks, or scratches on the paper P.

(C) Invention or Problem to be Solved However, in the above-mentioned conventional paper ejecting device, the curl removal roller group 52, 53, 55 for removing curls from the paper P, and the paper Helei (3
A pair of rollers 59 and 60 for ejecting and kicking the paper are required at 31-, which poses a big problem in terms of the cost of the paper ejecting device. Further, since the paper P has to pass between the complicated pair of rollers many times, paper jams are likely to occur.

In addition, the leading edge of the paper P that has actually been decurled often has a wavy shape, and paper jams may occur when the paper P enters between the roller 59 and the kicking roller 60. It was happening a lot. In particular, in recent image forming apparatuses, a wide variety of paper sheets P are often used, and these paper sheets P can be stably delivered to the ejection tray 6.
Thirty.

In order to discharge the paper to
The configuration of the paper ejecting device having the 56 and kicking mechanism 62 is no longer able to cope with this problem.

Therefore, the present invention provides a paper ejecting device in which the roller group of the curl removing unit and the kicking rollers of the kicking unit are configured by a group of rollers, thereby shortening the paper conveyance path and simplifying the configuration. The purpose is to

(d) Means for Solving the Problems The present invention has been made in view of the circumstances mentioned in 1. For example, see FIGS. 1 to 4.
an ejection roller (1) for conveying the paper (r)) and ejecting the paper (r) to the ejection tray (13); and the ejection roller (1).
The first roller (2
) and a second roller (3) that presses against its 1'-stream side.
and a plurality of decurling units (7) consisting of holding members (5A) that hold the eleventh and second rollers (2) and (3), respectively, and a predetermined pressing force on the discharge roller (1). In the paper ejecting device, the paper ejecting device has a kicking part +4' (l O') which is in pressure contact with the paper (I) and kicks out the rear end of the paper (I). The pressing force for pressing the take-up unit (7) against the discharge roller (1) and the suppressing force for pressing the kicking roller (9) against the discharge roller (1) are set to lI〒. shall be.

(E) Function Based on the above configuration, when the paper (P) is conveyed to the ejection roller (1) section, the paper (P) is moved to the curl removal unit 1 to (7).
) is pressed against the discharge roller (1) and is discharged to the discharge tray (13) while being decurled.
The trailing edge of the paper (P) is kicked out to the ejection tray (13) by a kicking roller (9) that presses the ejection roller (1) with a different pressing force than that of the curl removing unit (7).

As a result, the paper is integrated into the curl removing unit (7) and the kicking roller (9) or discharge roller (1), shortening the paper conveyance path and simplifying the device. Stable discharge lr+.

Please note that the symbols in the brackets above refer to the drawings. ;((This is shown for purposes of illustration only, and is not intended to limit the structure of the present invention in any way.

(F) Example A first example of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, a sheet P on which a desired image has been formed in an image forming section 31 is conveyed to a curved cart plate 35 via a pair of guide plates 32 and a pair of conveyance rollers 33 provided on the downstream side thereof. On the downstream side of this guy 1 to plate 35,
Upper guide plate 3 having a step in the traveling direction of paper P
6a and a lower guide plate 36b that is paired with the lower guide plate 36a.

On the downstream side of the pair of guide plates 36a, 36b, a plurality of discharge rollers 1 are disposed along the axis of the shaft 37 and fixed at appropriate intervals. 1. As shown in FIG. 2, both ends of the shaft 37 are rotatably supported via bearings 40 on support plates 39n and 39b respectively erected at both ends of the paper discharge stay 39. A discharge roller gear 41 fixed to one end of the discharge roller gear 41 is driven by a drive section (not shown).

On the lower circumferential surface of the ejection roller 1, a tenth roller 2 and a second roller 3 disposed downstream of the tenth roller 2 (downstream side in the paper conveyance direction) or a second roller 3 placed in pressure contact with the ejection roller l as described later are driven. It is designed to rotate. As shown in FIG. 3, the first roller 2 and the second roller 3 are rotatably supported by shafts 42 and 43 on support plates erected at both ends of the roller holter (holding member) 5A. . ,F
A pressure spring 6A made of a diagonal spring is disposed between the roller holder 5A and the paper ejection stay 39, and its base is fixed to the paper ejection stay 39. The first roller 2 and the second roller 3 are urged so as to come into pressure contact with the discharge roller 1.

Further, the upstream base of the paper ejection stay 39 is rotatably attached to a support plate 46 (see FIG. 1) fixed to the paper ejection stay 39 by a shaft 45.

The above-mentioned first roller 21 second roller 3. A curl removing unit 7 is constituted by the roller holter 5A, the pressure spring 6A, and the like. Such a curl removal unit 7 is
As shown in FIG. 2, two sets are provided on both the left and right sides.

Among the discharge rollers 1 fixed to the shaft 37, for example, the second
In the figure, the two sets of discharge rollers 1 in the center are pressed by the first roller 2 shown in FIG. 4 and the kicking roller 9 at the downstream position in the sheet conveyance direction, respectively, as will be described later. The ends of the kickers 109 extend from the ends of the discharge roller 1, and the kicker members 10 each having a plurality of protrusions arranged at appropriate intervals are provided at the ends of the peripheral surface thereof. There is.

The first roller 2 and the kicking roller 9 are pressed against the discharge roller l by a predetermined pressure of 1L by a pressure spring 613 made of a plate spring provided between the roller holter 5B and the IJF paper stay 39.
Pressed/-E with force. The pressurizing force of this pressurizing spring 6B is set smaller than the pressurizing force of the pressurizing spring 6A described in 1-1. In this way, the kicking roller 9 having the kicking member 10, the roller holter 513, the pressure spring 6[3, etc., are used to remove curls and kick out the L knit 11.

A sensor lever 15 is rotatably provided at a suitable position on the paper ejection stay 39, and one end of the sensor lever 15 is connected to the sensor 16.
The passage of the paper P through the discharge roller 1 is detected by changing the state from the cut state to the state where the light is transmitted.

In the above configuration, the sheet P on which an image has been formed in the image forming section 31 in the image forming apparatus is conveyed to the curved guide plate 35 by the pair of conveying rollers 33. At this time, since the paper P has just passed through a heat fixing device (not shown) in the image forming apparatus, the guide plate 35 causes the paper P to curl in the same direction as its curved shape. Thereafter, the paper P is guided to the ejection roller 1 by the guide pair 36a, 36b, and the ejection roller l rotates in the direction of the arrow in FIG. The paper is ejected onto the ejection tray 13 by the rollers 3 of No. 2, the iron pick-up rollers 9, and the like.

Therefore, the operations of each part of the one-thread roller 1, the first roller 2, the second roller 3, the kicking roller 9, and the paper P will be further explained. First, there are six discharge rollers 1 made of rubber or the like and each having a diameter of 13 mm, which are arranged at approximately equal intervals along the shaft 37.
The discharge roller gear 4I continues to rotate at a constant rate for the time required to convey the paper.

In this embodiment, the outer diameter of the roller 2.3 and the kicking roller 9 is φ8 mm, and the kicking member 10 of the kicking roller 9 is
The outer diameter of is φ9n+I++. In addition, the first roller 2
The distance between the first roller 2 and the second roller 3, and the distance between the first roller 2 and the kicking roller 9 are both set to 1IInffl.

Next, the curling and weighting unit 11 uses the pressure spring 6
The decurling unit 7 is pressed against the discharge roller 1 with a pressing force of about 450 g by the pressure spring 6A. When the paper P enters the ejection roller section configured as described above, the curls formed on the paper 1'' are removed as the paper P is transferred to the curl removal unit 7 and the curl removal kicking unit 1.
1 to the outer periphery of the discharge roller 1,
While the curled portion is corrected in the opposite direction, the output tray 13.
It is discharged to II °C. When the trailing edge of the paper P that is being ejected passes through the nip section, it kicks out: y rJ
The rear end is kicked out by the kicking member 10 of 9.

A second embodiment of the present invention will be described with reference to FIG.

In the first embodiment, kicking rollers 9 for kicking out are arranged at two central locations of each roller of the discharging roller 1, so as not to impair the kicking function. The pressure force of the pressure spring 6B was made smaller than the pressure force of the other pressure springs 6A. However, if a configuration having pressure springs 6A and 6B with different pressure forces is provided,
It is necessary to provide two types of pressure springs 6A and 6B, which causes problems such as complicating component management and device assembly.

In this embodiment, the curl removing unit 7 and the curl removing kicking unit 11 are configured to be pressed against the discharge roller 1 by a common pressure spring 6A. The outer diameter of the kicking roller 9 forming the curl removing kicking unit 11 is the same as that of the first roller 2 forming the curl removing unit 7. By increasing the outer diameter of the second roller 3 (approximately 1 am larger in this embodiment), the amount of deformation of the pressure spring 6A during assembly can be reduced by the decurling unit 7 and the decurling kicking unit 1.
One part is different from the other to create a difference in pressing force. By configuring the curl removing unit 7 part and the curl removing kicking unit 11 part in this way, the pressure spring 6
Since A can be constructed from the same parts, the quality of the device is maintained! F's I (can be eliminated by eliminating the conjunction).

FIG. 6 is a side view of a discharge roller section showing a third embodiment of the present invention. Components having the same functions as those in the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted.

In the figure, the shaft 42 of the first roller 2 is removably attached to a long hole formed in the roller holter 5A. A support lever 1 is attached to the roller shaft 43 of the second roller 3.
The base of the roller 7 is pivotally mounted, and a kicking roller 19 is rotatably mounted on the free end of the roller 7 by a shaft 20, and the kicking roller 19 has both ends like the kicking roller 9 of the first embodiment. It has a kicking member 21 at the bottom. A pressure spring 22 made of a torsion spring is fitted to the roller shaft 43, and one end of the pressure spring 22 is attached to a pin 46 fixed to the roller holder 5A.
The other end of the roller 19 is fixed to a shaft 20, and the elasticity of the pressure spring 22 causes the kicking roller 19 to move toward the discharge roller l.
is pressed against the circumferential surface of the

A curl removal unit 7 is constituted by the above-mentioned first roller 2, second roller 3, roller holter 5A, pressure spring 6A, etc., and also includes the support lever 17, kicking member 21, pressure spring 22, etc. A kicking mechanism 23 is configured by the thin plate. The curl removing unit 7 and the pressure spring 22 constitute a curl removing kicking unit 25, and this curl removing kicking unit t=
At least two 25 are provided in the longitudinal direction (axial direction) of the discharge roller l.

In the curl removal kicking unit configured as described above, the curl removal with respect to the discharge roller 1 is performed by the pressure spring 6A for the curl removal unit 7 and the pressure spring 22 for the kicking mechanism 23, as in the first embodiment. Since the proper pressing force of the unit 7 and the kicking mechanism 23 can be set respectively, the same effect as in the above embodiment can be obtained, and the curl removing unit 7 and the kicking mechanism 23 are It becomes possible to use the same unit in both directions, and it is possible to reduce the cost of the device and improve ease of assembly.

(G) As described in detail, the present invention includes a group of rollers for removing curls, which were provided in a separate location in the conventional paper ejecting section, and a kicking roller for ejecting the paper to a tray. A pair,
By combining the ejection rollers into a group of rollers and forming a unit, the ejection rollers can be combined into a unit.
i l? In addition, as the transport path is shortened, paper jams are also reduced, and the paper can be stably ejected to the ejection tray.

In addition, by making it possible to press the curl removing unit and the kicking unit with different pressing forces against the ejection roller, the high pressing force at the curl removing unit corrects the curl of the paper and also kicks the paper. The unit uses an appropriate pressing force to push against the ejection roller and kick out the trailing edge of the paper. It can be prevented.

In addition, since the paper curl correction function and the kicking function can be separated and their pressing forces can be set to different magnitudes, the degree of freedom when designing the paper ejection section is increased, allowing for a variety of types. It is possible to discharge various types of paper.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional side view showing the first embodiment of the present invention, and the second embodiment is
The figure is a front view of the discharge roller section, FIG. 3 is a vertical side view of the curl removing unit, FIG. 4 is a vertical side view of the kicking unit, and FIG. FIG. 6 is a longitudinal sectional side view of the ejection roller portion of a paper ejection device showing a third embodiment of the present invention, and FIG. 7 shows an example of a conventional paper ejection device. FIG. P...paper, ■...discharge roller, 2...
・First roller, 3...Second roller, 5
A. 5[3...roller holter, 6Δ, 6■3...pressure spring, 7...curl removal unit, 9.
...Obstacle start roller, 10...Kick start member 11
...Curl kick begins;L;-t13...IJ
F output 1 helay, 17...Support lever 19...
Kicking out 2) Mouth, 21...Kicking out member 22...
Pressure spring, 2:I...Kicking mechanism 25...Curl removal kicking unit;

Claims (1)

[Claims] 1. A discharge roller for conveying paper and discharging the paper to a discharge tray, a first roller that circumscribes the circumferential surface of the discharge roller with a predetermined pressing force, and a first roller on the downstream side thereof; a plurality of curl removing units each including a second roller that is in pressure contact with each other and a holding member that holds the first and second rollers, respectively;
A paper ejecting device having a kicking roller including a kicking member that is in pressure contact with the ejecting roller with a predetermined pressing force and kicking out a trailing edge of the paper, wherein a pusher that presses the curl removal unit against the ejecting roller is provided. A paper ejecting device characterized in that a pressure and a pressing force for pressing the kicking roller against the ejecting roller are set to different pressing forces. 2. having at least one said decurling unit;
At least one curl removal kicking unit including the kicking roller provided at a position downstream of the first roller in the sheet conveyance direction is arranged in the longitudinal direction of the discharge roller.
2. A paper ejecting device comprising: a pressing force of the curl removing unit on the ejecting roller and a pressing force of the curl removing kicking unit on the ejecting roller that are different from each other. 1. The paper ejecting device according to 1.