JP2791669B2 - Sheet ejection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Field of Industrial Application) The present invention relates to a sheet material discharging device such as a copying machine, a printer, and a facsimile which discharges a sheet material cut like a document and a recording sheet.

(Prior Art) FIG. 3 shows an example of such a conventional sheet material discharging apparatus. In the figure, 100 is a roller for discharging the sheet material S, 101 is a roller for pressing the sheet material S against the roller 100, and 102 is a tray on which the discharged sheet material S is stacked. The roller 100 is provided with a flange 100a to make the discharged sheet material S rigid and to improve the stackability of the sheet material S. The discharged sheet material S is deformed into a waveform by the rollers 101. While being discharged onto the tray 102.

(Problems to be solved by the invention) However, if the diameter of the flange 100a is too large,
The flange 100a becomes an obstacle to the discharged sheet material S, and inconveniences such as jamming, breakage, wrinkles, etc. are apt to occur, so that the flange diameter cannot be increased so much that the sheet material S cannot be provided with sufficient rigidity. The sheet material S heated by the fixing unit or the like is rounded on the tray 102 in a direction orthogonal to the discharge direction, and falls from the tray 102, is scattered on the tray 102, and the stacking order (page alignment) is different. There were drawbacks such as going crazy.

In order to avoid such drawbacks, it is conceivable to take measures such as bringing the tray 102 closer to the roller 100, increasing the number of rollers 100 and the rollers 101, and increasing the pressing force of the rollers 101. However, if the above method is adopted, the tray 102
The number of sheets that can be stacked on the sheet 100 decreases, the load on the driving source of the roller 100 increases, and a large motor or the like must be used. None of them is preferable because traces of 101 remain and the quality is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problem, and provides a sheet material with rigidity without inducing wrinkles, breaks, or jams when the sheet material is ejected, thereby eliminating rounding of the sheet material at the time of ejection, and providing the sheet material on a tray. It is an object of the present invention to provide a sheet material discharge device capable of preventing the sheet material from being disturbed, dropped, and out of order in the stacking. Another object is to reduce the number of trays on which the discharged sheet material is stacked, increase the cost due to an increase in the driving force of the roller, and leave no trace of the roller or roller on the sheet material. It is an object of the present invention to provide a sheet material discharging device capable of giving sufficient rigidity to a sheet material.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a roller and pressure contact means for pressing at least three places along the axial direction with respect to the outer peripheral surface of the roller, and presses the roller from the upstream side. The sheet material conveyed to the position, in a sheet material discharge device that rotates the roller in a certain direction and discharges the downstream,
A part of the pressing means is displaced upstream or downstream on the outer peripheral surface of the roller so that the pressing position by the pressing means is non-linear when viewed in the axial direction of the roller.

(Operation) In the operation of the present invention based on the above configuration, since the rollers are displaced upstream or downstream with respect to the sheet material and pressed against the sheet material in a non-linear manner, sufficient rigidity is given to the sheet material.

(Embodiment) Hereinafter, the present invention will be described based on an embodiment shown in FIGS. 1 and 2. FIG.

In the figure, reference numeral 1 denotes a plurality of rollers, and the rollers 1 are fixed to a rotating shaft 2 at predetermined intervals. The rotating shaft 2 is directly or indirectly rotated in the direction of the arrow by a driving source (not shown). In the illustrated embodiment, a plurality of rollers having the same diameter are connected, but an integrated roller may be used.

Reference numeral 3 denotes an outer peripheral surface 1a of the roller 1 along the axial direction.
This is a pressing means for pressing at more than one place. The pressing means 3 includes a plurality of leaf springs 3a to 3d fixed to the support portion 4 by appropriate means,
The roller 3 includes a plurality of rollers 3e to 3h pressed against the outer peripheral surface 1a of the roller 1 by the urging forces of the leaf springs 3a to 3d. Although four pairs of the pressure contact means 3 are provided in the illustrated embodiment, more than three pressure contact means may be provided. The rollers 3e to 3h are rotatably provided via a shaft 5 to shims 3c 'provided at the free ends of the leaf springs 3a to 3d. The rollers 3e to 3h are in non-linear pressure contact with the outer peripheral surface 1a. That is, in the illustrated embodiment, the pressure contact position a of the rollers 3e and 3h located at both ends of the roller 1 is displaced by a distance l to the downstream side A from the pressure contact position a of the rollers 3f and 3g located inside. It is. In addition, although not particularly shown, the pressure contact positions a of the rollers 3e and 3h located on both ends of the roller 1 are reversed.
May be displaced to the upstream side B from the pressure contact position a of the rollers 3f and 3g located inside. The distance l
Is desirably set such that the deformation angle θ of the sheet material P passing between the roller 1 and the rollers 3e to 3h is not less than 2 ° and not more than 90 °. Of course, the angle is not limited to this range.

Reference numeral 6 denotes a tray provided on the downstream side A of the roller 1 and the pressing means 3, and the tray 6 is a place where the sheet material P passing between the roller 1 and the pressing means 3 is stacked.

 Next, the operation of the present invention will be described.

First, an upstream side B, for example, a fixing unit (not shown) of a copying machine
The sheet material P conveyed by an appropriate means from the roller 1
And comes into contact with the pressure contact position a between the pressure contact means 3 and the pressure contact means 3. Then, the roller 1 rotates in the direction of the arrow, and the rollers 3e to 3e.
Since 3h is driven and rotated while being pressed, the sheet material P is guided to the pressed position a. At this time, since the rollers 3e and 3h are displaced to the downstream side A from the rollers 3f and 3g, the discharge angle differs between the inside and the outside of the sheet material P, and the sheet material P curves in a mountain shape along the discharge direction of the sheet material P. In other words, the entire sheet material is greatly deformed, is given a large rigidity, is gradually discharged to the downstream side A, and when the rear end of the sheet material P is completely removed from the roller 1 and the pressing means 3, the sheet material is accurately placed on the tray 6. Is placed. Thereafter, the sheet materials P are successively discharged onto the tray 6 in a similar manner.

By the way, in the above-described embodiment, the description has been given of the case where the pressing means 3 that presses the roller 1 at three or more places is unit-structured for each pressing position. For example, a leaf spring is formed by one sheet, A stepped rod-shaped roll body whose diameter is increased only at the portion to be pressed against 1 may be rotatably mounted, and the entire pressure-contact means 3 may be integrally formed. Also,
In the above embodiment, a rotatable roller is shown as being in pressure contact with the roller 1, but other pressure contact members may be used. Further, in the illustrated embodiment, the roller 1 has a normal cylindrical shape. However, it is needless to say that the roller 1 may be provided with flanges at both ends.

(Effect of the Invention) Since the present invention is configured as described above, the entire sheet material is deformed when the sheet material conveyed from the upstream side is discharged to give a large rigidity, so that the sheet material is wrinkled, bent, or broken. Jams can be suppressed, and the sheet material on the tray can be prevented from being disturbed, dropped, and the stacking order can be prevented.
In addition, the number of trays on which sheets to be discharged are stacked is reduced, the cost is increased due to an increase in the driving force of the rollers, and there is no trace of rollers or pressure rollers on the sheets. This provides various effects of providing high rigidity.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view, FIG. 2 is a schematic side view showing a displacement state of a press-contact means, and FIG. 3 is a perspective view showing a conventional example. It is. DESCRIPTION OF SYMBOLS 1 ... Roller, 1a ... Outer peripheral surface of roller 3 ... Pressing means, 3a-3d ... Leaf spring 3e-3h ... Roller, A ... Downstream side B ... Upstream side, P ... Sheet Material a ... Pressure contact position

Claims (7)

(57) [Claims] A roller that presses the sheet material conveyed from an upstream side to a pressing position at a predetermined position along an axial direction with respect to an outer peripheral surface of the roller; In the sheet material discharging device which rotates and discharges to the downstream side, a part of the pressing members among the pressing members is displaced upstream or downstream on the outer peripheral surface of the roller, and is disposed by the pressing member. 2. A sheet discharging device according to claim 1, wherein said pressing position is non-linear when viewed in the axial direction of said roller. 2. The pressure contacting position of a part of the pressure contacting means located at both ends of the roller is displaced downstream from the pressure contacting position of another pressure contacting means. Sheet material discharge device. 3. The pressure-contact means of claim 1, wherein the pressure-contact positions of some of the pressure-contact means located at both ends of the roller are displaced upstream from the pressure-contact positions of the other pressure-contact means. Sheet material discharging device. 4. A sheet material discharging apparatus according to claim 1, wherein said pressing means comprises a leaf spring and a roller pressed against a roller by the urging force of said leaf spring. 5. A sheet material discharging apparatus according to claim 1, wherein said pressing means is constituted as a unit for each pressing position. 6. A sheet material discharging apparatus according to claim 1, wherein said press contact means is formed integrally. 7. The sheet material discharging apparatus according to claim 1, wherein the roller has flanges at both ends of an outer peripheral surface.