JPS63143168A - Sheet stacker - Google Patents

Abstract

PURPOSE:To secure correct sheet alignment accuracy even for sheet with different sizes by slidably fitting a sliding member having a pressing roll to the support arm of a support bed 9 peeling off sheets from a transfer device and guiding them to a discharge tray. CONSTITUTION:The sheet 8a from a transfer device 2 is peeled off by a peeling claw 14 and further discharged on a discharge tray 6 by a nip roll 13, an actuator 22a is rotated as the stacked quantity of sheets is increased, and a support bed 9 is lifted by the action of a sensor 22 via a cable 12. As a result of this rise, the tip of the sheets 8 is displaced forward along an aligning stopper 7, the distance between the nip roll 13 and the aligning stopper wall face 7a is increased, but the guide roll 25 of a sliding member 23 slidably supported by a support arm 15 is lifted along the wall face 7a and moved somewhat forward, and a pressing roll 24 invariably keeps a fixed distance from the aligning stopper 7. The aligning stopper 7 is arranged in response to the sheet size. Accordingly, correct sheet alignment accuracy can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a paper stacking device equipped with a filter paper aligning mechanism in a copying machine, a printer, or the like.

``Prior Art J'' In a paper stacking device installed in a copying machine or a printer, the free end of the paper output tray is inclined slightly downward in order to easily receive the ejected paper. To align the tip by making it contact the alignment stopper,
The paper is pressed by a pressure roll of a paper alignment mechanism.

The position of the alignment stopper is moved back and forth in accordance with the size of the paper to be ejected onto the paper ejection tray. Since the paper ejection tray is in an inclined state as described above and the alignment stopper is provided almost perpendicularly to the paper ejection tray,
As the amount of paper ejected onto the output tray increases, the leading edge of the paper gradually moves further away from the paper insertion section of the output tray (
It has become.

In conventional paper stacking devices, there is a mechanism that changes the position of the suppression roll of the paper alignment mechanism in response to changes in the size of the paper ejected to the paper output tray, and a mechanism that changes the position of the suppression roll of the paper alignment mechanism in response to changes in the size of the paper ejected to the paper output tray. There was no mechanism to adjust the position of the pressure roll.

"Problems to be Solved by the Invention" In conventional paper stacking devices, as mentioned above, the position of the damper roll of the paper alignment mechanism cannot be adjusted to accommodate multiple paper sizes, so it is difficult to align the leading edge of the paper. The distance between the alignment stopper and the pressure roll changes as the paper size changes, making it difficult to ensure accurate paper alignment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper stacking device in which a paper alignment mechanism can always be placed at a predetermined position for sheets of multiple sizes.

"Means for Solving the Problems" The paper stacking device of the present invention has a slide plate that holds a pressure roll slidably mounted on a support lever attached to a support base, so that When changing the size of the sheets to be discharged, the pressure roll can always be held from the alignment stopper, that is, from the leading edge of the sheets, and the precision of sheet alignment of the stacked sheets is ensured.

"Example" An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, a transport device 2 is provided between a pair of vertically oriented frames (the other is the path shown) 1 for transporting paper on which an image has been recorded by a copying machine, printer, etc. from above. . This conveyance device 2 is composed of a plurality of belts 4 that are passed around a shaft 3, and a suction fan 5 that is arranged behind the belts 4.

The paper discharge tray 6 whose base portion is fixed to the frame 1 has a free front end inclined slightly downward.

An alignment stopper 7 is attached to the paper discharge tray 6 so as to be movable back and forth (approximately freely movable in FIG. 1) in a state substantially perpendicular to the paper loading surface. , is manually moved to the B5 position indicated by a solid line and the A4 and B4 positions indicated by imaginary lines in accordance with the size of the paper 8 to be discharged onto the paper discharge tray 6 as will be described later.

A support stand 9 made of a pair of fixed side plates is provided in front of the transport device 2 so as to be movable up and down. A guide pulley 1 pivotally connected to the frame 1 is mounted on the support stand 9.
Each end of the cable 12 passed through the cable 1 is fixed, and the support base 9 is moved up and down by a drive source (not shown) as will be described later.

A stripping gt mechanism is provided within the support base 9, which includes a pair of nip rolls 13 that rotate in the direction of the arrow, and a stripping claw 14 whose free end extends between the belts 4 of the conveying device 2.

A support arm 15 is pivotally attached to the upper part of the support stand 9 by a shaft 16, and this support arm 15 is held substantially parallel to the paper loading surface of the paper output tray 6 by a stopper (not shown), and is supported by an arrow mark. It can be rotated in 17 directions.

The base of a short arm 18 is fixed to one end of the shaft 16, and the short arm 18 can engage with a bin 19 fixed to the frame 1 when the support base 9 is raised.

A sensor 22 for detecting the amount of sheets 8 stacked is provided at the free end of the mounting member 21 whose base is fixed to the support arm 15 . The base of a slide member 23 is slidably attached to the support arm 15, and a pressure roll 24 for pressing the paper 8 on the paper discharge tray 6 by its own weight is pivotally mounted near the free end of the slide member 23. It is worn. A guide roll 25 is provided at the free end of the support arm 15 and can come into contact with the wall surface 7a of the alignment stopper 7.
is pivoted.

In this way, the paper alignment mechanism 26 is operated by the support stand 9, the support arm 15, the pressure roll 24, the guide roll 25, etc.
is configured. This paper aligning machine 126 is normally in the non-operating position 26A shown by the chain line, and the support arm 15 and the short arm 18 integrated therewith are shown in the chain line where the short arm 18 is rotated counterclockwise by the pin 19. It is located at the location shown.

Before stacking the sheets 8 on the sheet discharge tray 6, the alignment stopper 7 is set at a predetermined position corresponding to the sheet size. When the copying machine, printer, etc. starts to operate, the cable 12 rotates clockwise in FIG. move. During this rotation, the slide member 23 slides along the support arm 15 toward the free end. The support stand 9 is connected to the paper output tray 6 by the sensor 22.
The vehicle will be stopped near the station and will wait. Note that the slide member 23
When slides toward the alignment stopper 7° due to its own weight,
The guide roll 25 faces the upper part of the alignment stopper 7. As a result, the pressing roller 24 is automatically set at a predetermined position on the paper discharge tray 6 simply by lowering the support stand 9.

The paper 8a conveyed by the conveyance device 2 is peeled off from the conveyance device 2 by a peeling claw 14, and is then separated from the conveyance device 2 by a nip roll 13.
The paper is ejected onto the paper ejection tray 6. The actuator 22a of the sensor 22 is in contact with the paper 8 on the paper discharge tray 6, and gradually rotates as the stack amount of the paper 8 on the paper discharge tray 6 increases, and the sensor 22 detects this. As a result of this detection by the sensor 22, the cable 12 is slightly rotated counterclockwise to raise the support base 9.

As shown in FIG. 2, as the stack amount of the paper 8 on the paper output tray 6 increases, the leading edge of the paper 8 is displaced forward (to the right in FIG. becomes larger, and the alignment stopper 7
In the upper part of , a maximum displacement of β occurs. However, when the support base 9 is raised, the guide roll 2 of the slide member 23
5 rises following the wall surface 7a of the alignment stopper 7, and the slide member 23 moves slightly forward toward the alignment stopper 7.

This movement of the slide member 23 makes it possible for the pressure roll 24 to always be located at a constant distance from the alignment stopper 7, so that regardless of the amount of stacked sheets 8,
The paper alignment action of the upper paper 8 can be performed with high precision.

The above operation has been described for the case where the size of the paper 8 is B5 and the alignment stopper 7 is set at the position shown by the solid line in FIG. The pressure roll 24 can be placed at a predetermined position simply by setting 7 to the position shown by 7b or 7C.

When the stacking of the sheets 8 onto the sheet discharge tray 6 is completed, the support stand 9 is raised to the upper limit position by detection by a switch or sensor (not shown). When the short arm 18 engages with the pin 19 and rotates counterclockwise during this upward movement, the support arm 15 rotates in the same direction and the slide member 2
3 slides toward the support stand 9 side. By rotating the paper alignment mechanism 26 to the non-operating position 26A, the paper 8 on the paper discharge tray 6 can be easily taken out from the paper discharge tray 6.

"Effects of the Invention" As explained above, according to the present invention, a support arm that is substantially parallel to the paper output tray is provided on the support base that has the function of peeling the paper from the conveying device and guiding it to the paper output tray; By slidably attaching a slide member having a pressure roll that presses the paper to the support arm, the alignment stopper can be simply set at the required position when stacking multiple different sizes of paper on the paper output tray. This makes it possible to set the pressure roll at the required position, ensuring accurate paper alignment.

[Brief explanation of the drawing]

FIG. 1 is a side view of a paper stacking device showing an embodiment of the present invention, and FIG. 2 is a side view of the paper stacking device showing a change in the position of a paper alignment mechanism due to an increase in the amount of paper stacked. l...7L/-A, 2...Transportation 1ff
i, 6... Paper output tray, 7... Alignment stopper, 8... Paper, 9... Support stand,
12... Cable, 13... Nip roll, 14... Peeling claw, 15... Support arm, 18... Short arm, 19. ...Pin, 22 ...Sensor, 23 ...Slide member, 24 ...Press roll, 25 ...Kite roll.

Claims (1)

[Scope of Claims] 1. A support arm whose free end is inclined downward and whose base is attached to a support stand which can be raised and lowered, above the paper discharge tray from which paper is discharged; an alignment stopper whose base is attached so as to be movable back and forth to align the sheets; and a pressure roller whose base is slidably attached to a support arm and whose free end is in contact with the alignment stopper and which presses the sheets. and a slide member that holds sheets of various sizes at a constant distance from an alignment stopper. 2. The press roll is held at a constant distance from the alignment stopper by a sliding member sliding to follow the alignment stopper as the number of sheets on the paper output tray increases. A paper stacking device according to scope 1.